TechSpec_Sect500_Guideway Insp 07-29-25.pdf

500 TECHNICAL SPECIFICATIONS

SECTION 1 – INTRODUCTION Page #

1.1 General 2

1.2 Guideway Columns 2

1.3 Guideway Column Listing – Table 1 4

1.4 Guideway Columns Schedule L Listing – Table 2

Column Schedule L Map

1.5 Guideway Beams 16

1.6 Guideway Beam Listing – Table 3 18

1.7 Guideway Beams Schedule M Listing – Table 4

Beams Schedule M Map

1.8 Guideway Beams Schedule K Listing – Table 5

Beams Schedule K Map

1.9 Guideway Deck Joints Listing – Table 6

Deck Joints Schedule Map

SECTION 2 – INSPECTIONS

2.1 General 39

2.2 Schedule 39

2.3 Qualifications 39

2.4 Inspection Equipment 40

2.5 Procedures 41

2.6 Reports 49

SECTION 3 – MAINTENANCE

3.1 General 52

3.2 Schedule 52

3.3 Surface Sealing 53

Page #

3.4 Epoxy Injection 58

3.5 Drainage 60

3.6 Deck Flushing 60

3.7 Operational Maintenance 61

APPENDIX

Appendix A – Guideway Drawings

Site Map General Guideway Plan Sheet Typical Guideway Cross Section Typical Guideway Column Conditions Typical Guideway O-Ribs Typical Guideway Mounted Elements

Appendix B – Sample Inspection Map Plans

Column Map Beam Deck (Topside) Map Beam Exterior Map

Appendix C – Beam Coating Data List

Beam Coating Data List Typical Beam Cross Section

Appendix D – Surface Sealer Product Data

Appendix E – Specification for Epoxy Adhesive

Appendix F – Sample Maintenance Reports

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 1

SECTION 1 - INTRODUCTION

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 2

1.0 INTRODUCTION

1.1 GENERAL

The Detroit Central Automated Transit System is an automated light-rail transit system using an elevated guideway with a continuous loop route configuration. The transit system travels on rails mounted on the top deck surface of the guideway. The superstructure of the guideway consists of precast, post tensioned, concrete segmental box beams supported on a substructure of conventionally reinforced and post tensioned reinforced concrete columns. The precast concrete sections were post-tensioned at the fabrication plant to accommodate shipping and erection stresses. Additional tendons were field post-tensioned to develop continuity after the cast-in-place concrete was placed and cured. Refer to Appendix A for typical guideway sections and mounted elements on the box beams.

Guideway inspections are intended to assess the current condition of the Guideway elements and to provide a documented history of the structural condition of each of the beam and column sections. Certain beams required epoxy injection of major cracks and the installation of internal stiffening ribs, "O-Ribs”, to make them structurally viable. Refer to Appendix A for typical section of an O-Rib. Physical changes in the columns and beams are to be identified, mapped and monitored so that timely repairs can be scheduled and historical records maintained. Also, unusual occurrences, such as accidental damage or earthquakes, are to be recorded.

The purpose of the DPM Long Term Guideway Structure Inspection and Maintenance Program is to ascertain the current structural condition of the guideway and its components, to provide recommendations for guideway repairs and the methods to complete the repairs. As noted in the Agreement, the biannual inspections shall conform to Federal Highway Administration National Bridge Inspection Standards (NBIS) and the contract repairs shall be accomplished in the same season.

The Program establishes that thirty (30) percent of the beams and columns will be inspected as part of the biannual inspections. Using the collected data, an extrapolation of the repairs to be made to the entire guideway will be used to prepare the Repair Contract. The remainder of the biannual guideway inspection will be completed while the Repair Contract work begins. The Repair Contract shall include epoxy injection of cracks, surface sealer application and other repair or maintenance items as recommended based upon the inspections.

An Escrow Funding Agreement was established because deficiencies were found with the original construction of certain beams and columns comprising the support structure for the Guideway System. These beams were defined as the "Low Cover Beams” (listed in Schedule M), the "Low Cover Columns" (listed in Schedule L), and the "Cracked Beams” (listed in Schedule K).

The funds from the Escrow Funding Agreement are used for the inspection, maintenance and repair (including replacement, modification, reinforcement and rebuilding, if necessary) of the Schedule M and K beams and the Schedule L columns during the fifty (50) year design life of the DPM Guideway Structure, The United States Department of Transportation's Federal Transit Administration (FTA) and the Michigan Department of Transportation (MDOT) were designated as the Funding Agencies in the Agreement.

1.2 GUIDEWAY COLUMNS

The DPM column support system consists of one hundred seventy-five (175) columns and fifteen (15) column crossheads or pier caps. These concrete structural members are conventionally reinforced and post tensioned. Offset columns are those with pier caps that support the beams offset from one side of the column. Column shape varies from round to oval.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 3

During construction of the columns, a substantial portion of the columns did not have proper concrete cover of the steel reinforcement. Columns with a concrete cover measuring less than one and one-half of an inch (1 ½") are considered to be insufficient, and are designated as Schedule L Columns. There are one-hundred two (102) of these columns. Refer to Appendix A for typical column conditions.

All columns are listed in Table 1 of Section 1.3 inventorying the column characteristics, such as column shape, type and concrete cover. Schedule L columns are listed in Table 2 of Section 1.4.

The Detroit Transportation Corporation has a complete set of design and record drawings in its possession. Three different design drawings exist for the guideway system: 1) the original design drawings, 2) the repair drawings, 3) drawings of replaced members. A set of record inspection drawings are also, maintained by DTC. Refer to Appendix A for the guideway general plan and key plan.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 4

1.3 GUIDEWAY COLUMN LISTING

TABLE 1 – Guideway Column Listing

Column Mark

Column Type

Type of Beam Support

Concrete Cover Less Than 1/2"

Station

Inspection

Remarks EA1 Round Expansion 0 + 00.00 X FA2 Round Fixed Yes 0 + 80.00 X Schedule L EA3 Round Expansion 1 + 60.00 X FA4 Round Fixed 2 + 40.00 X EA5 Round Expansion 3 + 35.00 X FA6 Round Fixed Yes 4 + 19.00 X Schedule L EA7 Round Expansion 5 + 03.00 X FA8 Round Fixed Yes 5 + 88.00 X Schedule L EA9 Round Expansion Yes 6 + 70.00 X Schedule L FA10 Round Fixed 7 + 62.50 X EA11 Round Expansion 8 + 55.00 X FA12 Round Fixed Yes 9 + 45.00 X Schedule L

FA13X Oval Fixed Offset 10 + 45.00 X EA14 Round Expansion 11 + 32.00 X FA15 Round Fixed 12 + 14.00 X EA16 Round Expansion Yes 13 + 02.00 X Schedule L FA17 Round Fixed Yes 13 + 80.00 X Schedule L FA18 Round Fixed Yes 14 + 62.00 X Schedule L EA19 Round Expansion 15 + 40.00 X FA20 Round Fixed 16 + 06.00 X

FA21X Oval Fixed Offset Yes 16 + 97.00 X Schedule L EA22 Round Expansion Yes 17 + 67.00 X Schedule L FA23 Round Fixed Yes 18 + 62.00 X Schedule L FA24 Round Fixed Yes 19 + 65.00 X Schedule L EA25 Round Expansion 20 + 65.00 X FA26x Oval Fixed Offset Yes 21 + 47.50 X Schedule L EA27 Round Expansion Yes 22 + 30.00 X Schedule L FA28 Round Fixed 23 + 20.00 X EA29 Round Expansion Yes 24 + 09.00 X Schedule L FA30 Round Fixed 24 + 87.00 X FA31 Round Fixed Yes 25 + 72.00 X Schedule L

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 5

Mark

Column Type

Type of Beam

Support

Concrete Cover

Less Than 1/2"

Inspection

Remarks EA32 Round Expansion 26 + 50.00 X FA33 Round Fixed 27 + 50.00 X FA34 Round Fixed Yes 28 + 37.00 X Schedule L FA35 Round Fixed 29 + 25.00 X EA36 Round Expansion Yes 30 + 05.00 X Schedule L FA37 Round Fixed 30 + 54.00 X EA38 Round Expansion Yes 31 + xx.44 X Schedule L FA39 Round Fixed 32 + 33.44 X EA40 Round Expansion 33 + 27.46 X FA41 Round Fixed Yes 34 + 22.46 X Schedule L EA42 Round Expansion 35 + 12.46 X FB1 Round Fixed Yes 35 + 97.46 X Schedule L EB2 Round Expansion Yes 36 + 82.46 X Schedule L FB3 Round Fixed Yes 37 + 62.46 X Schedule L

FB4X Oval Fixed Offset Yes 38 + 57.46 X Schedule L FB5 Round Fixed Yes 39 + 32.46 X Schedule L EB6 Round Expansion 40 + 02.46 X

FB7X Oval Fixed Offset Yes 40 + 77.46 X Schedule L FB8 Round Fixed Yes 41 + 67.46 X Schedule L EB9 Round Expansion Yes 42 + 37.46 X Schedule L

FB10H Oval Fixed 43 + 07.46 X FB11H Oval Fixed Yes 44 + 32.46 X Schedule L EB12 Round Expansion 45 + 12.46 X FB13 Round Fixed Yes 45 + 97.46 X Schedule L FB14 Round Fixed 46 + 97.46 X EB15 Round Expansion Yes 47 + 57.46 X Schedule L FB16 Round Fixed Yes 48 + 17.46 X Schedule L

FB17X Oval Fixed Offset 49 + 02.46 x EB18 Round Expansion Yes 49 + 67.46 X Schedule L FB19 Round Fixed Yes 50 + 31.21 X Schedule L

FB20X Oval Fixed Offset Yes 50 + 96.21 X Schedule L

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 6

Mark

Column Type

Type of Beam

Support

Concrete Cover

Inspection

Remarks FB21 Round Fixed 51 + 81.21 X EB22 Round Expansion 52 + 51.21 X FB23 Round Fixed Yes 53 + 53.21 X Schedule L

EB24T Round Expansion

Turnout

54 + 50.21 X

FB25T Oval Fixed Turnout Yes 55 + 45.21 X Schedule L

EB26T Round

Turnout Yes

56 + 35.21

Schedule L FB27 Round Fixed 57 + 33.96 X FB28 Round Fixed 58 + 53.96 X

EB29X Oval

Offset Yes

59 + 50.21

Schedule L FB30 Round Fixed Yes 60 + 20.21 X Schedule L EB31 Round Expansion Yes 60 + 90.21 X Schedule L FB32 Round Fixed Yes 61 + 70.21 X Schedule L

EB33T Round

Turnout Yes

62 + 50.21

X Schedule L FB34T Oval Fixed Turnout Yes 63 + 17.71 X Schedule L

EB35T Round

Turnout

63 + 75.21

FB36 Round Fixed 64 + 87.36 X EB37 Round Expansion Yes 65 + 99.36 X Schedule L FB38 Round Fixed Yes 67 + 14.36 X Schedule L EB39 Round Expansion Yes 68 + 14.36 X Schedule L FB40 Round Fixed 69 + 04.36 X EB41 Round Expansion Yes 69 + 90.36 X Schedule L FB42 Round Fixed 70 + 79.36 X FB43 Round Fixed 71 + 77.36 X EB44 Round Expansion Yes 72 + 67.36 X Schedule L FB45 Round Fixed Yes 73 + 57.36 X Schedule L FB46 Round Fixed Yes 74 + 62.36 X Schedule L EB47 Round Expansion Yes 75 + 45.36 X Schedule L

FB48X Round Fixed Offset Yes 76 + 48.36 X Schedule L EB49 Round Expansion Yes 77 + 58.36 X Schedule L FC1 Round Fixed Yes 78 + 19.36 X Schedule L EC2 Round Expansion Yes 78 + 84.06 X Schedule L

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 7

Mark

Column Type

Type of Beam

Support

Concrete Cover

Inspection

Remarks FC3 Round Fixed Yes 79 + 64.06 X Schedule L EC4 Round Expansion Yes 80 + 28.06 X Schedule L FC5 Round Fixed Yes 80 + 75.56 X Schedule L

FC6X Oval Fixed Offset Yes 81 + 65.56 X Schedule L EC7 Round Expansion Yes 82 + 33.56 X Schedule L FC8 Round Fixed Yes 83 + 33.56 X Schedule L FC9 Round Fixed Yes 84 + 33.56 X Schedule L

EC10 Round Expansion 85 + 28.56 X FC11 Round Fixed Yes 86 + 11.06 X Schedule L EC12 Round Expansion Yes 86 + 93.56 X Schedule L FC13 Oval Fixed Yes 87 + 90.56 X Schedule L EC14 Round Expansion Yes 88 + 97.56 X Schedule L FC15 Round Fixed Yes 89 + 72.56 X Schedule L EC16 Round Expansion 90 + 63.56 X

FC17X Oval Fixed Offset Yes 91 + 58.56 X Schedule L FC18HX Oval Fixed Offset Yes 92 + 50.56 X Schedule L

FC19 Oval Fixed 93 + 88.56 X EC20 Round Expansion 94 + 78.56 X FC21 Round Fixed Yes 95 + 53.56 X Schedule L

FC22X Oval Fixed Offset 96 + 28.56 X FC23 Round Fixed 97 + 28.56 X EC24 Round Expansion 98 + 08.56 X FC25 Round Fixed 99 + 08.56 X EC26 Round Expansion 100 + 03.56 X FC27 Round Fixed 100 + 79.56 X EC28 Round Expansion 101 + 55.67 X FC29 Round Fixed Yes 102 + 49.67 X Schedule L EC30 Round Expansion 103 + 43.67 X FC31 Round Fixed Yes 104 + 39.67 X Schedule L EC32 Round Expansion 105 + 37.67 X FC33 Round Fixed 106 + 35.67 X

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 8

Mark

Column Type

Type of Beam

Support

Concrete Cover

Inspection

Remarks FC34 Round Fixed 107 + 57.67 X EC35 Round Expansion 108 + 52.67 X FC36 Round Fixed Yes 109 + 56.67 X Schedule L FC37 Round Fixed Yes 110 + 81.67 X Schedule L EC38 Round Expansion Yes 111 + 77.67 X Schedule L

FC39X Oval Fixed Offset Yes 112 + 70.67 X Schedule L FC40 Oval Fixed 113 + 80.67 X EC41 Round Expansion Yes 114 + 55.67 X Schedule L FC42 Oval Fixed 115 + 30.67 X FC43 Round Fixed 116 + 15.77 X EC44 Round Expansion Yes 116 + 85.77 X Schedule L FC45 Round Fixed Yes 117 + 80.77 X Schedule L EC46 Round Expansion 118 + 94.27 X FC47 Oval Fixed Yes 119 + 50.10 X Schedule L FC48 Oval Fixed Yes 120 + 56.77 X Schedule L

FC49X Oval Fixed Offset Yes 121 + 76.77 X Schedule L EC50 Round Expansion 122 + 51.77 X FC51 Round Fixed 123 + 25.27 Xx FC52 Round Fixed 124 + 06.95 X EC53 Round Expansion Yes 124 + 71.95 X Schedule L FD1 Round Fixed Yes 125 + 71.95 X Schedule L ED2 Round Expansion 126 + 71.95 X FD3 Round Fixed Yes 127 + 66.95 X Schedule L FD4 Round Fixed Yes 129 + 06.99 X Schedule L ED5 Round Expansion Yes 129 + 56.95 X Schedule L FD6 Round Fixed Yes 130 + 71.95 X Schedule L FD7 Round Fixed Yes 131 + 75.72 X Schedule L ED8 Round Expansion Yes 132 + 75.72 X Schedule L FD9 Round Fixed Yes 133 + 60.72 X Schedule L

ED10 Round Expansion Yes 134 + 60.72 X Schedule L FD11 Round Fixed 135 + 60.72 X

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 9

Mark

Colum n Type

Type of Beam

Support

Concrete Cover

Inspection

Remarks ED12 Round Expansion 136 + 60.72 X FD13 Round Fixed Yes 137 + 45.72 X Schedule L ED14 Round Expansion Yes 138 + 30.72 X Schedule L FD15 Oval Fixed Yes 139 + 34.50 X Schedule L ED16 Oval Expansion Yes 140 + 38.00 X Schedule L

FD17H Oval Fixed Yes 141 + 38.00 X Schedule L FD18H Oval Fixed Yes 142 + 38.00 X Schedule L

EGMW1 Round

143 + 83.07 X At/Near RenCen

EGMW2 Round

143 + 96.11

Station

EGMWPC

Pier Cap

143 + 90.19

FGMCH Oval

145 + 32.52

EGME1 Round

146 + 08.39

EGME2 Round

146 + 21.44

Station

EGMEPC

Pier Cap

146 + 14.31

GMB19 Round

143 + 79.34 X RenCen Basement

(Truck Receiving Area)

GMB20 Round

144 + 00.25

(Truck Receiving Area)

GMB25 Round 145 + 06.31 X RenCen Basement

GMB27.5 Round

145 + 51.15

(Between Driving Lanes)

GMB30 Round 146 + 03.67 X RenCen Basement GMB31 Round 146 + 22.76 X RenCen Basement

GMA19 Round

143 + 78.69

GMA31 Round

146 + 28.72 X GTE Energy

Steam Room

GMA20

Oval/

Round

144 + 00.25

GMA26 Round

145 + 23.43

GMA27 Round

145 + 40.54

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 10

GMA30 Round

146 + 04.75 X GTE Energy

Steam Room GMWTG Girder 143 + 90.19 X RenCen (Inside) GMCTG Girder 145 + 32.52 X RenCen (Inside) GMETG Girder 146 + 14.31 X RenCen (Inside) FD19H Oval Fixed Yes 147 + 04.00 X Schedule L FD20H Oval Fixed 148 + 24.00 X ED21 Round Expansion Yes 149 + 23.00 X Schedule L FD22 Round Fixed 150 + 04.16 X FD23 Round Fixed Yes 151 + 04.16 X Schedule L

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 11

1.4 GUIDEWAY COLUMN SCHEDULE L LISTING

TABLE 2 – Guideway Column Schedule L Listing

Mark

Column Type

Type of Beam Support

Concrete Cover Less Than 1-1/2" Remarks

FA2 Round Fixed Yes New sealer applied in 2016 FA6 Round Fixed Yes Same as above FA8 Round Fixed Yes Same as above EA9 Round Expansion Yes Same as above FA12 Round Fixed Yes Same as above EA16 Round Expansion Yes Same as above FA17 Round Fixed Yes Same as above FA18 Round Fixed Yes Same as above

FA21X Oval Fixed Offset Yes Same as above EA22 Round Expansion Yes Same as above FA23 Round Fixed Yes Same as above FA24 Round Fixed Yes Same as above FA26x Oval Fixed Offset Yes Same as above EA27 Round Expansion Yes Same as above EA29 Round Expansion Yes Same as above FA31 Round Fixed Yes Same as above FA34 Round Fixed Yes Same as above EA36 Round Expansion Yes Same as above EA38 Round Expansion Yes Same as above FA41 Round Fixed Yes Same as above FB1 Round Fixed Yes Same as above EB2 Round Expansion Yes Same as above FB3 Round Fixed Yes Same as above

FB4X Oval Fixed Offset Yes Same as above FB5 Round Fixed Yes Same as above

FB7X Oval Fixed Offset Yes Same as above FB8 Round Fixed Yes Same as above EB9 Round Expansion Yes Same as above

FB11H Oval Fixed Yes Same as above FB13 Round Fixed Yes Same as above EB15 Round Expansion Yes Same as above

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 12

Mark

Column Type

Type of Beam Support

Concrete Cover Less Than 1-1/2" Remarks

FB16 Round Fixed Yes New sealer applied in 2016 EB18 Round Expansion Yes Same as above FB19 Round Fixed Yes Same as above

FB20X Oval Fixed Offset Yes Same as above FB23 Round Fixed Yes Same as above

FB25T Oval Fixed Turnout Yes Same as above EB26T Round Expansion Turnout Yes Same as above EB29X Oval Expansion Offset Yes Same as above FB30 Round Fixed Yes Same as above EB31 Round Expansion Yes Same as above FB32 Round Fixed Yes Same as above

EB33T Round Expansion Turnout Yes Same as above FB34T Oval Fixed Turnout Yes Same as above EB37 Round Expansion Yes Same as above FB38 Round Fixed Yes Same as above EB39 Round Expansion Yes Same as above EB41 Round Expansion Yes Same as above EB44 Round Expansion Yes Same as above FB45 Round Fixed Yes Same as above FB46 Round Fixed Yes Same as above EB47 Round Expansion Yes Same as above

FB48X Round Fixed Offset Yes Same as above EB49 Round Expansion Yes Same as above FC1 Round Fixed Yes Same as above

EC2 Round Expansion Yes New sealer in 2016 not applied to exposed surfaces inside Cobo Hall

FC3 Round Fixed Yes Same as above EC4 Round Expansion Yes Same as above FC5 Round Fixed Yes Same as above

FC6X Ova! Fixed Offset Yes Same as above EC7 Round Expansion Yes Same as above FC8 Round Fixed Yes Same as above

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 13

Mark

Column Type

Type of Beam Support

Concrete Cover Less Than 1/2" Remarks

FC9 Round Fixed Yes New sealer in 2016 not applied to exposed surfaces inside Cobo Hall

FC11 Round Fixed Yes Same as above EC12 Round Expansion Yes New sealer applied in 2016 FC13 Oval Fixed Yes Same as above EC14 Round Expansion Yes Same as above FC15 Round Fixed Yes Same as above

FC17X Oval Fixed Offset Yes Same as above FC18HX Oval Fixed Offset Yes Same as above

FC21 Round Fixed Yes Same as above FC29 Round Fixed Yes Same as above FC31 Round Fixed Yes Same as above FC36 Round Fixed Yes Same as above FC37 Round Fixed Yes Same as above EC38 Round Expansion Yes Same as above

FC39X Oval Fixed Offset Yes Same as above EC41 Round Expansion Yes Same as above EC44 Round Expansion Yes Same as above FC45 Round Fixed Yes Same as above FC47 Oval Fixed Yes Same as above FC48 Oval Fixed Yes Same as above

FC49X Oval Fixed Offset Yes Same as above EC53 Round Expansion Yes Same as above FD1 Round Fixed Yes Same as above FD3 Round Fixed Yes Same as above FD4 Round Fixed Yes Same as above ED5 Round Expansion Yes Same as above FD6 Round Fixed Yes Same as above FD7 Round Fixed Yes Same as above ED8 Round Expansion Yes Same as above FD9 Round Fixed Yes Same as above

ED10 Round Expansion Yes Same as above

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 14

Mark

Column Type

Type of Beam Support

Concrete Cover Less Than 1/2" Remarks

FD13 Round Fixed Yes New sealer applied in 2016 ED14 Round Expansion Yes Same as above FD15 Oval Fixed Yes Same as above ED16 Oval Expansion Yes Same as above

FD17H Oval Fixed Yes Same as above FD18H Oval Fixed Yes Same as above FD19H Oval Fixed Yes Same as above ED21 Round Expansion Yes Same as above FD23 Round Fixed Yes Same as above

Two double column expansion piers & one fixed column at Ren.

Cen. The awarded Contractor to update Key Plans & submit to DTC with Inspection Report.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 16

1.5 GUIDEWAY BEAMS

The superstructure of the guideway consists of precast, post tensioned, concrete segmental box beams supported on a substructure of conventionally reinforced and post tensioned reinforced concrete columns. The precast concrete sections were post-tensioned at the fabrication plant to accommodate shipping and erection stresses. Additional tendons were field post-tensioned to develop continuity after the cast-in-place concrete was placed and cured. After construction, some beams required epoxy injection of major cracks and the installation of internal stiffening ribs, or "O-Ribs”. Sixty-six (66) beams are stiffened with "O-Ribs” and are designated as Schedule K beams. Sixty-nine (69) beams have concrete cover of three-quarter of an inch (3/4") or less and are designated as Schedule M beams. There are thirty-one (31) beams common to both Schedules K and M. Refer to Appendix A for typical guideway sections and mounted elements on the box beams and O-Rib details.

Tables 3, 4 and 5 describe each guideway beam as to type, concrete cover, curved beam group number, beam repaired, number of O-Ribs installed, etc. Table 3 of Section 1.6 lists all beams, Table 4 of Section 1.7 lists beams in Schedule M (Concrete Cover Categories B to E), and Table 5 lists beams in Schedule K (beams that cracked immediately). Following are the derivations for the Curved Beam Group Number and the Concrete Cover Category used for Tables 3, 4 and 5.

TABLE A - Curved Beam Group Number

Group Equivalent Radius* Minimum Local Radius** Number of Beams

I > 250 ft. ≥ 750 ft. in the thin wall portion of the beam

60 tangent 39 curved

II > 250 ft. ≤ 300 ft.

300 ft. < R > 750 ft.

23 curved 21 curved

III ≤ 250 ft. NA 30 curved Total 173

*The equivalent radius is given on the structural drawings. It is used in the development of torsional loadings for curved structures and is computed as follows:

(beam length) 2_____

Equivalent radius = 8 x (maximum chord offset)

**Minimum local radius is the smallest actual radius occurring in the thin-walled portion of the beam.

TABLE B - Concrete Cover Category Concrete Cover Category

Concrete Cover

A 1 inch and greater B ¾ inch minimum C+ ½ inch minimum C- ¼ inch minimum D Less than ¼ inch for one or more reinforcing bars E One or more exposed reinforcing bars

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 17

Table 6 includes a listing of the seventy-one (71) guideway expansion joints including Jeene Joints and Emseal Horizontal Colorseal.

The Detroit Transportation Corporation has a complete set of design and record drawings in its possession. Three different design drawings exist for the guideway system: 1) the original design drawings, 2) the repair drawings, 3) the replaced span drawings. A set of record inspection drawings are also, maintained by DTC. Refer to Appendix A for the guideway general plan and Key plan.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 18

1.6 GUIDEWAY BEAM LISTING

TABLE 3 – Guideway Beam Listing

Beam Mark

Type of

Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In-

Place

Concrete Cover

Category Remarks A01A02 Box I B Schedule M A02A03 Box I B Schedule M A03A04 Box I A A04A05 Box I A A05A06 Box I C+ Schedule M A06A07 Box I A A07A08 Box I C- Schedule M A08A09 Box I C+ Schedule M A09A10 Box I A A10A11 Box II Yes 5 Yes A Schedule K A11A12 Box III Yes 10 Yes A Schedule K A12A13 Box II Yes 8 Yes A Schedule K A13A14 Box II Yes 5 Yes A Schedule K A14A15 Box I C+ Schedule M A15A16 Box I A A16A17 Box I A A17A18 Box I C+ Schedule M A18A19 Box III Yes 8 Yes B Schedule K & Schedule M A19A20 Box III Yes 6 Yes B Schedule K & Schedule M A20A21 Box III Yes 9 Yes B Schedule K & Schedule M A21A22 Box II Yes 5 Yes B Schedule K & Schedule M A22A23 Box I A A23A24 Box I A A24A25 Box I A A25A26 Box II Yes 2 Yes A Schedule K A26A27 Box II Yes 3 Yes C- Schedule K & Schedule M A27A28 Box II Yes 10 Yes C+ Schedule K & Schedule M A28A29 Box II Yes 3 Yes A Schedule K A29A30 Box I A A30A31 Box III Yes 7 Yes A Schedule K

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 19

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks A31A32 Box II A A32A33 Box I A Replaced 1998-1999 A33A34 Box III A Replaced 1998-1999 A34A35 Box III A Replaced 1998-1999 A35A36 Box II A Replaced 1998-1999 A36A37 Box I A A37A38 Box I A A38A39 Box I A A39A40 Box I A A40A41 Box I A A41A42 Box I A A42B01 Box I A B01B02 Box I A B02B03 Box I C+ Schedule M B03B04 Box III Yes 10 Yes C- Schedule K & Schedule M B04B05 Box II Yes 8 Yes C+ Schedule K & Schedule M B05B06 Box I A B06B07 Box II Yes 3 Yes C+ Schedule K & Schedule M B07B08 Box III Yes 8 Yes B Schedule K & Schedule M B08B09 Box III Yes 7 Yes B Schedule K & Schedule M

B09B10 Box

Haunch I C- Schedule M

B10B11 Box

Haunch III Yes 6 Yes C+ Schedule K & Schedule M

B11B12 Box

Haunch I C+ Schedule M B12B13 Box II A B13B14 Box III Yes 8 Yes C+ Schedule K & Schedule M B14B15 Box I C+ Schedule M B15B16 Box III Yes 6 Yes C- Schedule K & Schedule M B16B17 Box III Yes 7 Yes B Schedule K & Schedule M B17B18 Box II Yes 5 Yes C- Schedule K & Schedule M B18B19 Box I B Schedule M

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 20

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks B19B20 Box II Yes 6 Yes A Schedule K B20B21 Box III Yes 7 Yes B Schedule K & Schedule M B21B22 Box II Yes 7 Yes A Schedule K B22B23 Box II Yes 7 Yes A Schedule K B23B24 Box II Yes 11 Yes C+ Schedule K & Schedule M B24B25 Box II Yes 3 Yes C- Schedule K & Schedule M B25M26 Box I A B25B26 Box I C- Schedule M M26M27 Box I C- Schedule M B26B27 Box I C- Schedule M B27B28 Box I C- Schedule M B28B29 Box I C+ Schedule M B29B30 Box I A B30B31 Box I A B31B32 Box I C+ Schedule M B32B33 Box I A M33M34 Box I C- Schedule M B33B34 Box I B Schedule M B34B35 Box I C+ Schedule M B35B36 Box II Yes 12 Yes A Schedule K B36B37 Box I B Schedule M B37B38 Box I C+ Schedule M B38B39 Box II Yes 12 Yes B Schedule K & Schedule M B39B40 Box II Yes 5 Yes B Schedule K & Schedule M B40B41 Box I C+ Schedule M B41B42 Box I A B42B43 Box I A B43B44 Box I C+ Schedule M B44B45 Box I A B45B46 Box II Yes 9 Yes B Schedule K & Schedule M

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 21

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks B46B47 Box I A B47B48 Box II Yes 5 Yes A Schedule K B48B49 Box I A B49C01 Box I A C01C02 Box I A C02C03 Box I B Schedule M C03C04 Box II Yes 5 Yes A Schedule K C04C05 Box III Yes 4 Yes A Schedule K C05C06 Box III Yes 8 Yes B Schedule K & Schedule M C06C07 Box III Yes 8 Yes B Schedule K & Schedule M C07C08 Box I A C08C09 Box I A C09C10 Box II Yes 12 Yes A Schedule K C10C11 Box I A C11C12 Box I A C12C13 Box II Yes 11 Yes A Schedule K C13C14 Box I A C14C15 Box I A C15C16 Box II Yes 3 Yes A Schedule K C16C17 Box III Yes 7 Yes A Schedule K

C17C18 Box

Haunch III Yes 4 Yes B Schedule K & Schedule M

C18C19 Box

Haunch II B Schedule M C19C20 Box I C+ Schedule M C20C21 Box I A C21C22 Box II Yes 8 Yes A Schedule K C22C23 Box III Yes 8 Yes B Schedule K & Schedule M C23C24 Box II Yes 7 Yes B Schedule K & Schedule M C24C25 Box I B Schedule M C25C26 Box I A C26C27 Box II Yes 8 Yes A Schedule K

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 22

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks C27C28 Box II Yes 8 Yes B Schedule K & Schedule M C28C29 Box II Yes 6 Yes A Schedule K C29C30 Box I B Schedule M C30C31 Box I A C31C32 Box I A C32C33 Box I A C33C34 Box I B Schedule M C34C35 Box I C+ Schedule M C35C36 Box I A C36C37 Box I A C37C38 Box I A G38C39 Box II Yes 12 Yes B Schedule K & Schedule M C39C40 Box Ill Yes 11 Yes A Schedule K C40C41 Box III Yes 7 Yes A Schedule K C41C42 Box II Yes 8 Yes A Schedule K C42C43 Box II Yes 10 Yes A Schedule K C43C44 Box I A C44C45 Box I A C45C46 Box I A C46C47 Box I A C47C48 Box I A C48C49 Box I A C49C50 Box II Yes 5 Yes A Schedule K C50C51 Box III Yes 8 Yes A Schedule K C51C52 Box III Yes 7 Yes A Schedule K C52C53 Box III Yes 5 Yes A Schedule K C53D01 Box I A D01D02 Box I A D02D03 Box I A D03D04 Box I B Schedule M

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 23

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks D04D05 Box I B Schedule M D05D06 Box I B Schedule M D06D07 Box II Yes 4 Yes B Schedule K & Schedule M D07D08 Box I B Schedule M D08D09 Box I A D09D10 Box I A D10D11 Box I A D11D12 Box II A D12D13 Box III Yes 9 Yes B Schedule K & Schedule M D13D14 Box II Yes 10 Yes A Schedule K D14D15 Box I C+ Schedule M D15D16 Box I D Schedule M

D16D17 Box

Haunch II Yes 7 Yes A Schedule K

D17D18 Box

Haunch II Yes 6 Yes A Schedule K

D18RW

Box

Haunch III Yes 13 Yes A Schedule K RWRC Box I A RCRE Box I A

RED19

Box

Haunch III Yes 6 Yes A Schedule K

D19D20 Box

Haunch III Yes 5 Yes A Schedule K

D20D21 Box

Haunch I A D21D22 Box I A D22D23 Box I A D23A01 Box I A

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 24

1.7 GUIDEWAY BEAM SCHEDULE M LISTING

TABLE 4 – Guideway Beam Schedule M Listing

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks A01A02 Box I B New sealer applied in 2016 A02A03 Box I B Same as above A05A06 Box I C+ Same as above A07A08 Box I C- Same as above A08A09 Box I C+ Same as above A14A15 Box I C+ Same as above A17A18 Box I C+ Same as above A18A19 Box III Yes 8 Yes B Schedule K A19A20 Box III Yes 6 Yes B Schedule K A20A21 Box III Yes 9 Yes B Schedule K A21A22 Box II Yes 5 Yes B Schedule K A26A27 Box II Yes 3 Yes C- Schedule K A27A28 Box II Yes 10 Yes C+ Schedule K B02B03 Box I C+ New sealer applied in 2016 B03B04 Box III Yes 10 Yes C- Schedule K B04B05 Box II Yes 8 Yes C+ Schedule K B06B07 Box II Yes 3 Yes C+ Schedule K B07B08 Box III Yes 8 Yes B Schedule K B08B09 Box III Yes 7 Yes B Schedule K

B09B10 Box

Haunch I C- New sealer applied in 2016

B10B11 Box

Haunch III Yes 6 Yes C+ Schedule K

B11B12 Box

Haunch I C+ New sealer applied in 2016 B13B14 Box III Yes 8 Yes C+ Schedule K B14B15 Box I C+ New sealer applied in 2016 B15B16 Box III Yes 6 Yes C- Schedule K B16B17 Box III Yes 7 Yes B Schedule K B17B18 Box II Yes 5 Yes C- Schedule K B18B19 Box I B New sealer applied in 2016 B20B21 Box III Yes 7 Yes B Schedule K B23B24 Box II Yes 11 Yes C+ Schedule K

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 25

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks B24B25 Box II Yes 3 Yes C- Schedule K B25B26 Box I C- New sealer applied in 2016 M26M27 Box I C- Same as above B26B27 Box I C- Same as above B27B28 Box I C- Same as above B28B29 Box i C+ Same as above B31B32 Box I C+ Same as above M33M34 Box I C- Same as above B33B34 Box I B Same as above B34B35 Box I C+ Same as above B36B37 Box I B Same as above B37B38 Box I C+ Same as above B38B39 Box II Yes 12 Yes B Schedule K B39B40 Box II Yes 5 Yes B Schedule K B40B41 Box I C+ New sealer applied in 2016 B43B44 Box I C+ New sealer applied in 2016 B45B46 Box II Yes 9 Yes B Schedule K C02C03 Box I B New sealer applied in 2016 C05C06 Box III Yes 8 Yes B Schedule K C06C07 Box III Yes 8 Yes B Schedule K

C17C18 Box

Haunch III Yes 4 Yes B Schedule K

C18C19 Box

Haunch II B New sealer applied in 2016 C19C20 Box I C+ Same as above C22C23 Box III Yes 8 Yes B Schedule K C23C24 Box II Yes 7 Yes B Schedule K C24C25 Box I B New sealer applied in 2016 C27C28 Box II Yes 8 Yes B Schedule K C29C30 Box I B New sealer applied in 2016 C33C34 Box I B Same as above C34C35 Box I C+ Same as above

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 26

Mark

Type of Bearn

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added Forms Left

In-Place

Concrete Cover

Category Remarks C38C39 Box II Yes 12 Yes B Schedule K

D03D04 Box I B

New sealer applied in

D04D05 Box I B Same as above

D05D06 Box I B Same as above D06D07 Box II Yes 4 Yes B Schedule K

D07D08 Box I B

New sealer applied in

D12D13 Box III Yes 9 Yes B Schedule K

D14D15 Box I C+

New sealer applied in

D15D16 Box I D Same as above

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 27

Two double column expansion piers & one fixed column at Ren. Cen. The awarded Contractor to update the Key Plans and submit to DTC with the Inspection Report.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 28

1.8 GUIDEWAY BEAM SCHEDULE K LISTING

TABLE 5 – Guideway Beam Schedule K Listing

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In- Place

Concrete Cover

Category Remarks A10A11 Box II Yes 5 Yes A A11A12 Box III Yes 10 Yes A A12A13 Box II Yes 8 Yes A A13A14 Box II Yes 5 Yes A

A18A19 Box III Yes 8 Yes B Schedule M; new sealer applied 2016

A19A20 Box III Yes 6 Yes B Schedule M; same as above

A20A21 Box III Yes 9 Yes B Schedule M; same as above

A21A22 Box II Yes 5 Yes B Schedule M; same as above A25A26 Box II Yes 2 Yes A

A26A27 Box II Yes 3 Yes C- Schedule M; new sealer applied 2016

A27A28 Box II Yes 10 Yes C+ Schedule M; same as above A28A29 Box II Yes 3 Yes A A30A31 Box III Yes 7 Yes A

B03B04 Box III Yes 10 Yes C- Schedule M; new sealer applied 2016

B04B05 Box II Yes 8 Yes C+ Schedule M; same as above

B06B07 Box II Yes 3 Yes C+ Schedule M; same as above

B07B08 Box III Yes 8 Yes B Schedule M; same as above

B08B09 Box III Yes 7 Yes B Schedule M; same as above

B10B11 Box

Haunch III Yes 6 Yes C+ Schedule M; same as above

B13B14 Box III Yes 8 Yes C+ Schedule M; same as above

B15B16 Box III Yes 6 Yes C- Schedule M; same as above

B16B17 Box III Yes 7 Yes B Schedule M; same as above

B17B18 Box II Yes 5 Yes C- Schedule M; same as above B19B20 Box II Yes 6 Yes A B20B21 Box III Yes 7 Yes B Schedule M; same as

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 29

B21B22 Box II Yes 7 Yes A B22B23 Box II Yes 7 Yes A

B23B24 Box II Yes 11 Yes C+ Schedule M; new sealer applied 2016

B24B25 Box II Yes 3 Yes C- Schedule M; same as

B35B36 Box II Yes 12 Yes A

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 30

TABLE 5 - Guideway Beam Schedule K Listing

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of O- Ribs

Added

Forms Left In-

Place

Concrete Cover

Category Remarks

B38B39 Box II Yes 12 Yes B Schedule M; new sealer applied 2016

B39B40 Box II Yes 5 Yes B Schedule M; same as above

B45B46 Box II Yes 9 Yes B Schedule M; same as above B47B48 Box II Yes 5 Yes A C03C04 Box II Yes 5 Yes A C04C05 Box III Yes 4 Yes A

C05C06 Box III Yes 8 Yes B Schedule M; new sealer applied 2016

C06C07 Box III Yes 8 Yes B Schedule M; same as above C09C10 Box II Yes 12 Yes A C12C13 Box II Yes 11 Yes A C15C16 Box II Yes 3 Yes A C16C17 Box III Yes 7 Yes A

C17C18 Box

Haunch III Yes 4 Yes B Schedule M; new sealer applied 2016 C21C22 Box II Yes 8 Yes A

C22C23 Box III Yes 8 Yes B Schedule M; new sealer applied 2016

C23C24 Box II Yes 7 Yes B Schedule M; same as above C26C27 Box II Yes 8 Yes A

C27C28 Box II Yes 8 Yes B Schedule M; new sealer applied 2016 C28C29 Box II Yes 6 Yes A

C38C39 Box II Yes 12 Yes B Schedule M; new sealer applied 2016 C39C40 Box III Yes 11 Yes A C40C41 Box III Yes 7 Yes A C41C42 Box II Yes 8 Yes A C42C43 Box II Yes 10 Yes A C49C50 Box II Yes 5 Yes A C50C51 Box III Yes 8 Yes A C51C52 Box III Yes 7 Yes A C52C53 Box III Yes 5 Yes A D06D07 Box II Yes 4 Yes B Schedule M; new sealer

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 31 applied 2016

D12D13 Box III Yes 9 Yes B Schedule M; same as

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 32

TABLE 5 - Guideway Beam Schedule K Listing

Mark

Type of Beam

Curved Beam Group

Number Beam

Repaired

Number of

O-Ribs Added

Forms Left In- Place

Concrete Cover

Category Remarks D13D14 Box II Yes 10 Yes A

D16D17 Box

Haunch II Yes 7 Yes A

D17D18

Haunch II Yes 6 Yes A

D18RW

Haunch III Yes 13 Yes A

RED19

Haunch III Yes 6 Yes A

D19D20

Haunch III Yes 5 Yes A

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 33

Two double column expansion piers & one fixed column at Ren. Cen. The awarded Contractor to update the Key Plans and submit to DTC with the Inspection Report.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 34

1.9 GUIDEWAY DECK JOINT LISTING

TABLE 6 – Deck Joint Listing Location Remarks EA1 Jeene Joint EA3 same as above EA5 Emseal Horizontal Colorseal EA7 same as above EA9 Jeene joint EA11 Emseal Horizontal Colorseal EA14 Jeene Joint EA16 Emseal Horizontal Colorseal EA19 Jeene joint EA22 Emseal Horizontal Colorseal EA25 Emseal Horizontal Colorseal EA27 Jeene Joint EA29 Emseal Horizontal Colorseal EA32 Emseal Horizontal Colorseal EA36 Emseal Horizontal Colorseal EA38 Jeene joint EA40 Jeene joint EA42 Emseal Horizontal Colorseal EB2 Emseal Horizontal Colorseal EB6 Jeene joint EB9 Jeene joint EB12 Emseal Horizontal Colorseal EB15 Jeene joint EB18 Jeene joint EB22 Emseal Horizontal Colorseal EB24T Emseal Horizontal Colorseal EB26T Jeene joint EFM26T Emseal Horizontal Colorseal

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 35

TABLE 6 - Deck Joint Listing

EFM27 Jeene Joint EB29X Emseal Horizontal Colorseal EB31 Jeene Joint

EB33T Emseal Horizontal Colorseal EM33T Jeene Joint

EB35T

EB37 Emseal Horizontal Colorseal EB39 Jeene Joint EB41 Emseal Horizontal Colorseal EB44 Jeene Joint EB47 Emseal Horizontal Colorseal EB49 Jeene Joint EC2 same as above EC4 same as above EC7 same as above

EC10 same as above EC12 Emseal Horizontal Colorseal EC14 Jeene Joint EC16 Emseal Horizontal Colorseal EC20 Emseal Horizontal Colorseal EC24 Emseal Horizontal Colorseal EC26 Emseal Horizontal Colorseal EC28 Jeene Joint EC30 Emseal Horizontal Colorseal EC32 Emseal Horizontal Colorseal EC35 Emseal Horizontal Colorseal EC38 Emseal Horizontal Colorseal EC41 Emseal Horizontal Colorseal EC44 Emseal Horizontal Colorseal EC46 Emseal Horizontal Colorseal EC50 Emseal Horizontal Colorseal

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 36

TABLE 6 - Deck Joint Listing

EC53 Emseal Horizontal Colorseal ED2 Emseal Horizontal Colorseal ED5 Jeene Joint ED8 same as above

ED10 Emseal Horizontal Colorseal ED12 Emseal Horizontal Colorseal ED14 Emseal Horizontal Colorseal ED16 Emseal Horizontal Colorseal ERW Jeene Joint ERC same as above ERE same as above ED21 same as above

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 1 Page 37

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 2 Page 38

SECTION 2 - INSPECTIONS

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 2 Page 39

2.0 INSPECTION

2.1 GENERAL

The purpose of the guideway inspection is to ascertain the current structural condition of the guideway and its components and to provide a documented history. It is critical that the field inspections be conducted in a systematic and organized manner as to be efficient and thorough.

Inspection notes must be clear and detailed to the extent that they can be fully interpreted at a later date when a complete report is prepared. Sketches and photographs must be included in an effort to minimize long, verbose descriptions.

2.2 SCHEDULE

Guideway inspections shall be accomplished biannually in accordance with Federal Highway Authority (FHWA) National Bridge Inspection Standards (NBIS) and the contract repairs shall be accomplished in the same season. The Program establishes that thirty (30) percent of the beams and columns will be inspected as part of the biannual inspections. Using the data collected from the thirty (30) percent of the elements inspected, an interpolation of the repairs to be made to the entire guideway will be estimated and used to prepare the Repair Contract. The remainder of the biannual guideway inspection will be completed while the Repair Contract work begins.

So far as is practicable, the Engineer shall schedule guideway inspections in those periods of the year that offer the most desirable conditions for thorough inspections. Guideway members requiring high climbing should be inspected during those seasons when high winds are not prevalent. Inspections during temperature extremes such as the months of February and August shall be made at bearings, joints, etc., where trouble from thermal movement is suspected.

Unusual occurrences which may cause structural damage will require inspections at the time of the incident.

Certain portions of the guideway must be inspected during hours that the DPM is not in service.

Refer to Section 2.5 for those areas which require inspection during non-use hours.

2.3 QUALIFICATIONS

The Engineer overseeing the inspection team responsible for guideway inspection, reporting, and inventory shall possess the following minimum qualifications:

1) Be registered as a professional engineer under the laws of the State of Michigan;

and

2) Have a minimum of 5 years experience in guideway or bridge inspection assignments in a responsible capacity and have completed the 2 week Safety Inspection of In-Service Bridges certification training course based on the Bridge Inspector’s Training Manual, which has been developed by a joint Federal and State task force and published by the U.S. Department of Transportation.

The Engineer shall be responsible for the thoroughness of the field inspection and be qualified by experience and formal training to inspect concrete structures for distress.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 2 Page 40

The problems encountered in this work are numerous, variable, and often complex.

Consequently, the Engineer’s judgment is required frequently for proper evaluation of the findings.

The Engineer must be thoroughly familiar with design and construction features of the guideway to properly interpret observed and reported data. The Engineer must be able to recognize any structural deficiencies and report their seriousness in relation to other deficiencies found.

2.4 INSPECTION EQUIPMENT

The inspecting firm will be required to provide all equipment not available from the Detroit Transportation Corporation (DTC), needed to perform its work. A DTC vehicle would be available for use to move heavy inspection equipment around on the guideway. In the event that DTC has purchased equipment specifically for the guideway inspections, such as lifts, that equipment must be used.

The guideway inspection will require special equipment to be used. There may be a need for the use of hanging scaffolding to inspect the sides and underside of the guideway due to limited access below. Video cameras may be needed for areas where a person cannot inspect, but a camera can access. The video equipment could be suspended and pictures taken for viewing at a later time.

Truck mounted equipment with a basket (cherry-picker) or scissor lifts may be used to inspect the sides and underside of the guideway as well as the upper portions of the columns. When such equipment is used, it should be placed on the street or other hard surface where damage to the property will not be caused. When trucks or other wheeled vehicles are used on non-paved surfaces, those non-paved surfaces shall be protected from all types of damage that these vehicles could produce due to their wheels, size, weight, stabilizing arms, etc. If any damage is caused to paved or non-paved property, the inspecting firm will be responsible for its restoration to its condition prior to the use of these vehicles for inspection.

The inspection firm will be required to supply its own lighting equipment and power generation of sufficient light source to perform inspection during non-use hours. DTC will establish the times of non-use hours. Should the Guideway require cleaning prior to inspection, DTC will arrange to have the Guideway cleaned. Refer to Section 3.6 regarding deck flushing.

A detailed schedule of anticipated lane closures and work locations shall be devised for guiding inspection operations and obtaining permit approval through regulatory agencies having jurisdiction in the areas of the project. All equipment necessary for traffic control and lane closures will be the responsibility of the inspection firm to coordinate and provide.

Many parts of the guideway are located over or in private property which makes accessibility for inspection difficult to obtain. The inspecting firm will be responsible for acquiring permission from the private property owners to gain access to the guideway structure for inspection purposes.

DTC will provide to the inspecting firm a list of the private properties involved, their names, addresses, phone numbers, and contact persons.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 2 Page 41

The inspecting firm will have the responsibility of obtaining permission and permits from the City to operate on and around the City streets with their inspection equipment. DTC will aid the inspecting firm in obtaining the permits when necessary.

Portions of the guideway are required to be inspected in non-use hours because access to the guideway's top surface required by the necessary inspectors or equipment would interfere with the system's operation. Therefore, the inspection shall take place in non-revenue hours when the People Mover can be shut down and the power turned off. DTC will establish the times of non-revenue hours. DTC must be contacted for this shutdown so they can coordinate the operation of moving the passenger vehicles and turning off the power rail. It is DTC’s responsibility to disconnect the power and verify that all power has been removed from the power rail. The inspecting firm will be required to follow all of DTC’s safety procedures before entering the guideway or any other areas which have exposed power rails.

2.5 PROCEDURES

2.5.1 Overview

Generally, guideway inspection consists of the following practices:

♦ All visible cracks are to be reported, including the relative crack location, length and width.

♦ Locations of hollow concrete areas, delaminations and spalling are to be recorded, including spall length, width, and depth. If reinforcing steel, post tensioning tendons or ducts are encountered, they shall be recorded on the crack maps prepared.

♦ Areas of leaching, efflorescence, rust stains, water infiltration and scaling shall be located on the crack maps. Photographs of areas of significant leaching and noting the probable source of water infiltration into the concrete substrate shall be recorded.

♦ Local areas on decks and around bearings are to be cleaned to assure that significant defects are observed and properly reported.

♦ Previous repair plans are to be reviewed to determine whether previous cracks or deterioration has significantly changed. Observations should be noted on the prepared crack maps.

♦ Cracks and limits of hollow areas, delaminations and spalls upon the guideway structure are to be marked to permit the limits of the defect to be found in the future by a repair contractor and future inspectors. The markings upon the structure should be visible to the inspector or contractor, but not appear as graffiti upon the guideway, visible to the general public.

♦ All expansion joints shall be inspected to determine structural condition, water blockage, water leaking, failure of adhesive or seal, delamination of seal and failure or absence of joint material.

♦ Condition of bearings should be reported as to the presence of rust, bird waste and debris, bent or broken anchor bolts, loose nuts, abnormal movement of bearing.

♦ Power, Electrical and Communications apparatus attached to the guideway shall be evaluated to determine if adverse impacts are imparted to the structure due to the attachment of the utility to the guideway.

DPM Long Term Guideway Structure Inspection and Maintenance Program Section 2 Page 42

2.5.2 Procedures

The inspection shall include but not necessarily be limited to the following observations:

1) Support Columns - Examine all exposed concrete surfaces for the existence and severity of cracks and any deterioration of the concrete itself. Pay special attention to the areas where deicing salts are sprayed onto the structure by passing traffic.

Every guideway column shall be surveyed by a Michigan Professional Surveyor to determine if movement or settlement is taking place. These measurements shall be done once every six years as a minimum. The measurements shall include the following, but not necessarily be limited to these locations:

♦ Check plumbness of each support by taking measurements in two directions at the underside of the guideway member and at the base of support.

Any suspected movement or settlement shall be recorded in more detail than the normal interval measurements. These suspected movements shall be compared with previous records.

Every support column shall be sampled and tested for both total and water-soluble chloride ion in hardened concrete. The Federal Highway Administration’s Report No.

FHWA-RD-77-85, August 1977 interim report, "Sampling and Testing for Chloride Ion in Concrete” shall be used for sampling and test procedures. The sampling method that shall be used is the Rotary Impact Drill method, as listed in the report under 2.1.2. After the samples have been taken, fill the drilled holes with high-strength nonshrink mortar.

Seal the filled area with Hydrozo Clear 30-Modified. The water-soluble chloride ion content in the hardened concrete will determine when recoating of the entire support column is necessary.

The columns that have offset beams on top are so denoted in Table 1 in Section 1.2 under "Column Mark” as an 'X' at the end of its number, e.g., FA13X and under "Type of Beam Support” as 'offset.’ The offset columns have Dywidag anchors…