B08_A003_Bridge_Inspection_Report.pdf

BRIDGE INSPECTION REPORT

NORTHERN CANAL PEDESTRIAN BRIDGE

PEDESTRIAN BRIDGE OVER NORTHERN CANAL

LOWELL NATIONAL HISTORICAL PARK

LE

STRUCTURE NO. 1780-007T

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 6/21/14

Report prepared by: SS

Federal Highway Administration Federal Lands Bridge Office Bridge Inspection and Management Program 21400 Ridgetop Circle Sterling, Virginia 20166 http://www.efl.fhwa.dot.gov/FLHBO/BIP http://www.efl.fhwa.dot.gov/FLHBO/BIP

STRUCTURE SUMMARY STRUCTURE NO. 1780-007T

NORTHERN CANAL PEDESTRIAN BRIDGE INSPECTION DATE: 6/21/14

BRIDGE IDENTIFICATION AND DESCRIPTION

MAIN SPAN MATERIAL:

MAIN SPAN TYPE:

# OF BEAMS, MAIN SPAN: ..

DECK TYPE:

WEARING SURFACE:

ABUT. FOUNDATIONS:

PIER FOUNDATION(S):

ABUTMENT / PIER MAT'L: ...

PROJ./PLAN REF. NO:

NPS ROAD CLASS:

STRUCTURE HISTORY:

STEEL

STRINGER/MULTI-BEAM or GIRDER

WOOD OR TIMBER

NONE

SILL

SILL

CONCRETE

5299 /

6 - RESTRICTED

NO. OF MAIN SPANS:

NO. OF APPR. SPANS:

STRUCT. TOTAL LENGTH: ..

MAX. SPAN LENGTH:

DECK WIDTH:

CURB TO CURB WIDTH:

YEAR BUILT:

YEAR RECONSTRUCTED: ..

SKEW ANGLE:

FRACTURE CRITICAL:

83.0 FT (25.3 M)

48.0 FT (14.6 M)

8.0 FT (2.4 M)

7.9 FT (2.4 M)

N/A

43 °

NO

LOCATION

LOWELL NATIONAL HISTORICAL PARK MILE POINT:

STATE: ................................. MASSACHUSETTS LOCATION: Underneath Pawtucket Street at Northern Canal. Pedestrian structure is parallel to N abutment of FACILITY CARRIED: ............ PEDESTRIAN BRIDGE

Pawtucket Street bridge & allows access to structure

FEATURE INTERSECTED: .. NORTHERN CANAL 008T.

STRUCTURE EVALUATION SUMMARY

This steel girder pedestrian bridge is located under the Pawtucket Street vehicular bridge, and provides access to a hydroelectric plant and a canal gate control shed. A locked gate is in place at the east end of the bridge, but pedestrians are allowed access at various times during the year.

The structure is currently in fair condition overall. The main problems include a large spall with exposed rebar on the north end of the east pier cap; moderate delamination and cracking of the concrete piers; spot rusting throughout the steel superstructure, particularly at the bolted connections and at the edge of the girder flanges; debris accumulation on top of the girders and bearing seats through gaps between the deck planks; and rusting with section loss throughout the railing system, including broken connections between the panels. There are temporary repairs in place for the railing system, consisting of zip-ties and netting; these should be replaced with more permanent repairs.

Other problems observed include loose anchor bolt nuts, and vegetation growth at the west end of the deck.

Corrective action should be taken as outlined in this report to prevent the possible development of more serious or costly problems in the future. It should also be noted that the Pawtucket Bridge shows advanced structural deterioration and has a history of falling concrete. A safety net has been placed under the Pawtucket Bridge to help protect pedestrians below from debris. Until the highway structure is rehabilitated or replaced, measures to protect pedestrians from falling debris should remain and be maintained, and the pedestrian bridge should be regularly cleared of any debris and/or efflorescence.

INSPECTION TEAM: J. THOMAS, P. SW ANN (VOLKERT, INC.)

CONDITION ASSESSMENT:

JOE THOMAS, P.E., FIELD TEAM LEADER

REPORT REVIEW :

MARCUS MILLER, P.E., SENIOR INSPECTION ENGINEER 703-404-6252

REPORT APPROVAL: DATE: 10/13/14

JORGOMAI CEESAY, PH.D., P.E., BIP SUPERVISORY ENGINEER 703-404-6244

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 1780-007T

A (Critical) - Structure is closed, in imminent danger of collapse, or presents a critical safety hazard.

B (Major) - Structure is seriously deficient or presents a safety hazard, but can remain in service at reduced loads or with frequent inspections.

C (Moderate) - Structure is deficient, functionally obsolete, or requires substantial repairs to prevent a serious deficiency or unsafe condition.

D (Minor) - Structure is generally in good condition. Preventative maintenance may be required.

E (Special) - Structure is under construction or reconstruction.

C226 PRIORITY OF IMPROVEMENT

ITEM

NO.

MAINTENANCE RECOMMENDATIONS

(GENERALLY NOT FLHP ELIGIBLE)

QTY. UNIT COST

UNIT

ESTIMATE

COST

PRELIM.

59.2,6,7 CLEAN AND SPOT PAINT STRUCTURAL STEEL AS NECESSARY. 250 SF $60 $15,000

60.15 REMOVE UNSOUND CONCRETE AT EAST PIER CAP, CLEAN AND COAT REBAR,

AND PLACE NEW CONCRETE TO ORIGINAL DIMENSIONS. REPAIR DELAMINATED

CONCRETE AS NECESSARY.

1 LS $15,000 $15,000

59.1 REPAIR GROUT PADS AT PIERS. 6 EA $1,500 $10,000

58.6 REATTACH OR REPLACE RAIL PANEL ANCHORAGE AS NEEDED. 1 LS $5,000 $5,000

58.1, 60.3 REMOVE DEBRIS FROM BOTH ABUTMENT BEARING SEATS AND FROM GAPS

BETWEEN DECK PLANKS ALONG GIRDERS.

1 LS $3,000 $3,000

59.1 TIGHTEN ANCHOR BOLT NUTS AS NEEDED TO FULLY SEAT NUTS. 1 LS $1,500 $1,500

222.7 INSTALL PEDESTRIAN WARNING SIGNS AT APPROACHES, " CAUTION SLIPPERY

WALK. "

2 EA $500 $1,000

58.2 PERIODICALLY REMOVE VEGETATION GROWTH AT WEST END OF DECK. 1 LS $500 $500

PRELIM. MAINTENANCE TOTAL : $51,000

ITEM

NO.

REHABILITATION/RECONSTRUCTION

(TYPICALLY NEEDED WITHIN 5 YEARS)

QTY. UNIT

UNIT

COST ESTIMATES

PRELIM. COST

REHAB. RECONSTR.

58.6 REPLACE PEDESTRIAN RAILINGS. 166 LF $250 $0 $50,000

PRELIM. REHABILITATION/RECONSTRUCTION TOTAL : $0 $50,000

COST ESTIMATE SUMMARY

PRELIM. MAINTENANCE TOTAL:

PRELIM. REHABILITATION TOTAL:

PRELIM. RECONSTRUCTION TOTAL:

TOTAL ITEMIZED COSTS:

$50,000 $0 $51,000

$101,000

PRELIMINARY ESTIMATE TOTAL* :

(*Includes typical contract costs for mobilization, traffic control, and design/construction engineering; but does not include detour bridges, work beyond the bridge limits, or work not listed above. Estimates are approximate and are for preliminary planning purposes only; they should not be used as a complete or final engineers estimate.)

$101,000

REMARKS: Cost estimates assume that recommended actions will be combined with similar work being performed on other structures.

It should be noted that the Pawtucket Street Bridge, which crosses over this structure, is in poor condition and presents a potential safety hazard to pedestrians on this bridge.

FIELD INSPECTION REPORT STRUCTURE NO. 1780-007T

G = GOOD (CODES 7 - 9) F = FAIR (CODES 5 - 6) P = POOR (CODES 0 - 4)

CONDITION RATING CODE EQUIVALENTS FOR SUB-ELEMENTS

SERIOUS CONDITION - loss of section, deterioration, spalling, or scour have seriously affected primary structural components. Local failures are possible.

Fatigue cracks in steel or shear cracks in concrete may be present.

CRITICAL CONDITION - advanced deterioration of primary structural elements. Fatigue cracks in steel or shear cracks in concrete may be present or scour may have removed substructure support. Unless closely monitored it may be necessary to close the structure until corrective action can be taken.

“IMMINENT” FAILURE CONDITION - major deterioration or section loss present in critical structural components or obvious vertical or horizontal movement affecting structure stability. Structure is closed to traffic but corrective action may return structure to light service.

FAILED CONDITION - out of service; beyond corrective action.

CONDITION RATING CODES FOR ITEMS 58 - 62, 222, 223

NOT APPLICABLE

EXCELLENT CONDITION

VERY GOOD CONDITION - no problems noted.

GOOD CONDITION - some minor problems.

SATISFACTORY CONDITION - structural elements show some minor deterioration.

FAIR CONDITION - all primary structural elements are sound but may have minor section loss, cracking, spalling, or scour.

POOR CONDITION - advanced section loss, deterioration, spalling, or scour.

N

58. DECK

ITEM REFERENCE AND REMARKS

OTHER

ALIGNMENT

DEFLECTION AND/OR VIBRATION

FASCIA(E)

DIAPHRAGMS AND BRACING

TRUSSES

FLOOR BEAMS AND STRINGERS

ARCH(ES) OR SLAB(S)

GIRDERS OR BEAMS

BEARING DEVICES

59. SUPERSTRUCTURE

OTHER

DEFLECTION AND/OR VIBRATION

UTILITIES

DRAINS AND DRAINAGE

PARAPETS AND/OR RAILINGS

CURBS, SIDEWALKS, AND MEDIAN

RIDEABILITY

WEARING SURFACE

EXPANSION JOINTS

DECK SLAB

ABUTMENTS

60. SUBSTRUCTURE

1.

10.

2.

3.

4.

5.

6.

7.

8.

9.

10.

9.

8.

7.

6.

5.

4.

3.

2.

1.

PAINT

11.

(PEDESTRIAN SAFETY)

F F N N N G F N G

N G

N G N P F N

F

N

G

F

58.1,7,10 TYPICAL MINOR CHECKING OF TIMBER DECK PLANKS, MODERATE

AT EAST END AND SEVERAL PLANKS AT WEST END; UNEVEN DECK

PLANKS IN SEVERAL LOCATIONS. SPLIT PLANK NEAR MIDSPAN OF

CENTER SPAN.

RUST STAINING ON DECK WITH EFFLORESCENCE BUILT-UP AND

ALGAE GROWTH ON SPOTS DUE TO LEAKAGE FROM OVERHEAD

BRIDGE.

SAFETY NET HAS BEEN INSTALLED OVER ENTIRE STRUCTURE.

MODERATE DECAY OF TIMBER DECK PLANKS NEAR EAST END

MINOR VEGETATION GROWTH IN JOINT BETWEEN WEST END OF

DECK AND APPROACH. MINOR SOIL AND DEBRIS BETWEEN TIMBER

DECK PLANKS OVER BEAMS.

58.6 MODERATE TO SEVERE RUSTING WITH SECTION LOSS ON BRIDGE

RAILINGS. BROKEN RAILINGS IN SEVERAL LOCATIONS. FIVE

BROKEN RAIL PANNEL CONNECTIONS TO RAIL POST AS FOLLOWS:

POST #6 AT SOUTH RAIL AND POSTS #5, #6, #8, AND #10 AT NORTH

RAIL. TEMPORARY REPAIRS ARE IN PLACE.

MODERATE TO SEVERE RUSTING OF RAIL POST CONNECTION

HARDWARE.

59.1 MODERATE CRACKING AND SPALLING OF BEARING GROUT PADS.

SEVERAL ANCHOR BOLT NUTS ARE NOT FULLY SEATED.

ANCHOR BOLT IS MISSING FROM BEARING PLATE AT NORTH END

OF EAST PIER CAP.

59.2,6,7 MODERATE SPOT RUSTING AT BOLTED CONNECTIONS AND EDGES

OF GIRDER FLANGES. SMALL DENT IN BOTTOM FLANGE OF NORTH

GIRDER, MIDSPAN OF CENTER SPAN. MODERATE SPOT RUSTING

OF DECK CONNECTION BOLTS.

AREA OF PAINT FAILURE (1' L X 6" W) AT MIDSPAN OF NORTH FACE

OF SOUTH GIRDER.

BREASTWALLS OR COLUMNS1. G

PILE BENTS2. N

CAPS AND/OR BEARING SEATS3. G

BACKWALLS AND/OR BULKHEADS4. G

FOUNDATIONS5. N

WINGWALLS6. N

WEEP HOLES7. N

EXPANSION JOINTS8. N

EROSION AND/OR SCOUR9. G

SETTLEMENT OR DEFLECTION10. G

SLOPE PROTECTION11. N

OTHER (UTILITIES) 12. G

PIER(S)

G13. WALLS AND/OR COLUMNS

N14. PILE BENTS

P15. CAPS AND/OR BEARING SEATS

N16. FOUNDATIONS

G17. EROSION AND/OR SCOUR

G18. SETTLEMENT OR DEFLECTION

N19. OTHER

FIELD INSPECTION REPORT STRUCTURE NO. 1780-007T

ITEM REFERENCE AND REMARKS

STREAM BED COMPOSITION : 9.

AVERAGE CLEAR OPENING 8.

NORMAL VELOCITY 7.

ADEQUACY OF OPENING 6.

OTHER 5.

WATERWAY OBSTRUCTIONS 4.

CHANNEL PROTECTION3.

EROSION AND/OR SCOUR2.

ALIGNMENT1.

61. CHANNEL 8

G G G G N

LOW

SUFF

17 FT.

CONCRETE, ROCK

222. APPROACHES 7

OTHER 9.

ALIGNMENT 8.

SIGNS7.

SETTLEMENT 6.

EROSION5.

SURFACING4.

APPROACH GUARDRAIL 3.

2. RELIEF JOINTS

APPROACH SLABS1.

(GATES)

N N N G G G N G G

223. RETAINING WALL 7

OTHER 6.

SETTLEMENT OR DEFLECTION5.

EROSION AND/OR SCOUR4.

FOUNDATION3.

WEEP HOLES2.

1. WALL G

N N G G N

36. TRAFFIC AND SAFETY FEATURES

APPROACH GUARDRAIL ENDSD.

APPROACH GUARDRAILSC.

TRANSITIONSB.

BRIDGE RAILINGSA. N

N N N

TRAFFIC SAFETY RATING CODES

0 - Does not meet standards or a safety feature is required and none is provided.

1 - Meets currently acceptable standards.

N - Not applicable or a safety feature is not required.

60.1, 223.1 DAM AT WEST END OF BRIDGE SERVES AS WEST ABUTMENT;

NORTH CANAL WALL SERVES AS EAST ABUTMENT AND RETAINING

WALL. MINOR VEGETATION GROWTH IN NORTH CANAL WALL

MASONRY MORTAR JOINTS.

60.3 MINOR TO MODERATE ACCUMULATION OF DEBRIS ON BOTH

ABUTMENT BEARING SEATS.

60.12 THREE FLEXIBLE UTILITY LINES GOING INTO EAST ABUTMENT

(EAST CANAL WALL).

1" CONDUIT ALONG TOP OF WEST ABUTMENT BREASTWALL.

60.13 MODERATE VERTICAL CRACKING ON SOUTH FACE OF WEST PIER.

60.15 SEVERE SPALL (28" LONG X FULL HEIGHT X UP TO 6" DEEP) IN

NORTH END OF EAST PIER CAP, EAST FACE, WITH #5 REBARS AND

#3 STIRUPS EXPOSED AND RUSTED WITH MINOR SECTION LOSS.

MINOR CRACKING WITH EFFLORESCENCE ON BOTH FACES OF CAP.

SPALL HAS RESULTED IN LOSS OF BEARING ANCHOR ROD.

MODERATE CRACKING WITH AREA OF DELAMINATION (6" W X 8" L)

OF EAST FACE OF WEST PIER WITH MOISTURE STAINS. MINOR

CRACKING WITH EFFLORESCENCE AND DELAMINATION (32" X 32")

UNDER CENTER BEAM ON WEST FACE OF WEST PIER.

222.4 ASPHALT/GRAVEL APPROACH AT EAST END; GRANITE PAVERS AT

WEST END.

222.9 GATES AT NORTHWEST STAIRCASE AND EAST END OF STRUCTURE

WERE LOCKED AT TIME OF INSPECTION. MINOR TO MODERATE

RUSTING OF GATE AT EAST END.

APPENDIX STRUCTURE NO. 1780-007T

PHOTOGRAPHS STRUCTURE NO. 1780-007T

PHOTO #1 - LOOKING WEST AWAY FROM UMASS

PHOTO #2 - SOUTH SIDE

PHOTO #3 - GENERAL TOP SIDE VIEW LOOKING EAST

PHOTO #4 - GENERAL UNDERSIDE VIEW OF MAIN SPAN LOOKING

WEST

PHOTO #5 - RUST STAINING ON DECK PLANKS FROM BRIDGE ABOVE,

EAST END SHOWN

PHOTO #6 - TYPICAL DEBRIS ACCUMULATION ON TOPS OF BEAMS

THROUGH DECK PLANKS

PHOTO #7 - TYPICAL CHECKING AND WEARING OF DECK PLANKS,

EAST END SHOWN

PHOTO #8 - TYPICAL RUSTING OF RAILS, NORTH RAIL NEAR EAST END

SHOWN

PHOTO #9 - SECTION LOSS AND BROKEN RAILS IN GRATE PANEL #5,

SOUTH RAIL

PHOTO #10 - BROKEN PANEL CONNECTION AT EAST END OF PANEL

#5, SOUTH RAIL

PHOTO #11 - BROKEN PANEL CONNECTION AT EAST END OF PANEL

#7, NORTH RAIL

PHOTO #12 - GENERAL VIEW OF WEST ABUTMENT; NOTE WATER

STAINING, CRACKING WITH EFFLORESCENCE AND RUST STAINING

PHOTO #13 - TYPICAL CONDITION OF WEST ABUTMENT BEARINGS,

CENTER BEARING SHOWN

PHOTO #14 - TYPICAL RUSTING OF DECK CONNECTION BOLT, WEST

SPAN SHOWN

PHOTO #15 - TYPICAL RUSTING OF RAIL CONNECTION HARDWARE TO

GIRDERS, OVER WEST PIER SHOWN

PHOTO #16 - GENERAL VIEW OF WEST PIER

PHOTO #17 - TYPICAL RUSTING OF BASE PLATES AT BEARINGS,

NORTH BEARING AT WEST PIER SHOWN

PHOTO #18 - UNSEATED ANCHOR BOLT NUT ON CENTER BEARING OF

WEST PIER; NOTE SPALL ON BEARING SEAT

PHOTO #19 - CRACKING ON EAST FACE OF WEST PIER

PHOTO #20 - CRACKING WITH EFFLORESCENCE AND DELAMINATED

AREA ON WEST FACE OF WEST PIER CAP

PHOTO #21 - VERTICAL CRACKING ON SOUTH

FACE OF WEST PIER

PHOTO #22 - TYPICAL RUSTING ON BOTTOM

FLANGES OF GIRDERS, NORTH GIRDER IN

CENTER SPAN SHOWN

PHOTO #23 - AREA OF PAINT PEELING ON NORTH FACE OF SOUTH

GIRDER AT MIDSPAN OF CENTER SPAN

PHOTO #24 - GENERAL VIEW OF EAST PIER

PHOTO #25 - SPALL OF BEARING PAD AT CENTER BEARING OF EAST

PIER

PHOTO #26 - UNSEATED ANCHOR BOLT NUT ON SOUTH BEARING OF

EAST PIER; NOTE SPALL ON BEARING SEAT

PHOTO #27 - SPALL WITH EXPOSED REBAR ON EAST FACE OF NORTH

END OF EAST PIER CAP; NOTE EXPOSED BEARING ANCHOR BOLT

PHOTO #28 - GENERAL UNDERSIDE VIEW OF EAST SPAN LOOKING

EAST

PHOTO #29 - GENERAL VIEW OF EAST ABUTMENT; NOTE UTILITY

HOLES

PHOTO #30 - VEGETATION GROWING ALONG SOUTH END OF EAST

ABUTMENT

PHOTO #31 - TIMBER PLANKS IN PLACE ACROSS BEAMS OF ABOVE

PAWTUCKET STREET BRIDGE; NOTE SAFETY NETTING INSTALLED