Bridge_Inspection_Rpt_STR_5140-145P.pdf

TUNNEL INSPECTION REPORT

FERRIN KNOB TUNNEL #2

BLUE RIDGE PARKWAY THROUGH FERRIN KNOB

BLUE RIDGE PARKWAY

NP

STRUCTURE NO. 5140-145P

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 6/12/15

Report prepared by: SP

MILE POINT: 401.18

Federal Highway Administration KILOMETER POINT: 645.62 Federal Lands Bridge Office Bridge Inspection and Management Program 21400 Ridgetop Circle Sterling, Virginia 20166 https://bridge.flhd.fhwa.dot.gov

STRUCTURE SUMMARY STRUCTURE NO. 5140-145P

FERRIN KNOB TUNNEL #2 INSPECTION DATE: 6/12/15

TUNNEL IDENTIFICATION AND DESCRIPTION

LINING MATERIAL: ............... CONCRETE MINIMUM VERTICAL CLR: .... 14.1 FT (4.3 M)

SPRINGLINE LENGTH: ........ 29.4 FT (9.0 M) STRUCT. TOTAL LENGTH: ... 457.0 FT (139.3 M)

CURB TO CURB WIDTH: ..... 29.4 FT (9.0 M) YEAR BUILT:

PROJ./PLAN REF. NO: ......... 2S2, 2S9,2S1 / YEAR RECONSTRUCTED:

NPS ROAD CLASS: .............. 1 - PRINCIPAL PARK ROAD

STRUCTURE HISTORY: ...... 1985-LINING REHABILITATION.

LOCATION

BLUE RIDGE PARKWAY MILE POINT: ..................... 401.18 (KM PT 645.62)

STATE: .................................. NORTH CAROLINA LOCATION: 7.7 MILES TO NC ROUTE 191

FACILITY CARRIED: ............. BLUE RIDGE PARKWAY

FEATURE INTERSECTED: ... FERRIN KNOB

STRUCTURE EVALUATION SUMMARY

This concrete lined tunnel is in fair condition overall. The most pressing issue is the loose concrete, approximately 98', 135', and 210' from the north portal, which poses a hazard to motorists traveling through the tunnel and a crack in the rock shelf just beyond the north portal on the west side. Other problems include minor cracking and leakage to previously repaired areas, several areas of minor spalling with exposed rebar on the crown and lining, and missing reflectors from the lining and from the centerline striping. In addition, there are several areas of cracking with efflorescence and leakage on the lining.

Corrective action should be taken as outlined in this report to prevent the possible development of more serious or costly problems in the future.

INSPECTION TEAM: C. CASTRO, R. SILVESTRY

CONDITION ASSESSMENT:

CARLOS CASTRO, P.E., FIELD TEAM LEADER 571-434-1546

REPORT REVIEW:

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

REPORT APPROVAL: DATE: 12/31/15

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

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 5140-145P

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.

D226 PRIORITY OF IMPROVEMENT

ITEM

NO.

MAINTENANCE RECOMMENDATIONS

(GENERALLY NOT FLHP ELIGIBLE)

QTY. UNIT COST

UNIT

ESTIMATE

COST

PRELIM.

59.1 REMOVE LOOSE CONCRETE FROM LINING AND CROWN. CLEAN EXPOSED REBAR

AND SEAL WITH APPROVED PROTECTIVE COATING.

1 LS $5,000 $5,000

59.8 REPLACE MISSING AND DAMAGED REFLECTORS ALONG LINING. REPLACE

MISSING REFLECTORS ALONG CENTERLINE STRIPING.

1 LS $1,000 $1,000

PRELIM. MAINTENANCE TOTAL : $6,000

ITEM

NO.

REHABILITATION/RECONSTRUCTION

(TYPICALLY NEEDED WITHIN 5 YEARS) QTY. UNIT UNIT

COST ESTIMATES

PRELIM. COST

REHAB. RECONSTR.

PRELIM. REHABILITATION/RECONSTRUCTION TOTAL :

COST ESTIMATE SUMMARY

PRELIM. MAINTENANCE TOTAL:

PRELIM. REHABILITATION TOTAL:

PRELIM. RECONSTRUCTION TOTAL: ...

TOTAL ITEMIZED COSTS:

$0 $0 $6,000

$6,000

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.)

$6,000

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

FIELD INSPECTION REPORT STRUCTURE NO. 5140-145P

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

N

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.

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 CODE EQUIVALENTS FOR SUB-ELEMENTS

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

59. TUNNEL 6

F

2. PORTALS

1. LINING

F

N3. CURBS AND SIDEWALKS

F4. DRAINS AND DRAINAGE

G5. WEARING SURFACE

G6. RIDEABILITY

N7. LIGHTING

F8. OTHER (REFLECTORS)

9. ADEQUACY OF OPENING SUFF

222. APPROACHES 7

N1. APPROACH SLABS

N2. RELIEF JOINTS

N3. APPROACH GUARDRAIL

G4. SURFACING

G5. EROSION

G6. SETTLEMENT

G7. SIGNS

G8. ALIGNMENT

F9. OTHER (STRIPING)

223. RETAINING WALL N

1. WALL

2. WEEP HOLES

3. FOUNDATION

4. EROSION AND/OR SCOUR

5. SETTLEMENT OR DEFLECTION

6. OTHER

36. TRAFFIC AND SAFETY FEATURES

NA. BRIDGE RAILINGS

NB. TRANSITIONS

NC. APPROACH GUARDRAILS

ND. APPROACH GUARDRAIL ENDS

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.

ITEM REFERENCE AND REMARKS

59.1,4 TWO LARGE SPALLS ON LINING HAVE BEEN PATCHED BEFORE

PREVIOUS INSPECTION; SOUTHERN MOST PATCH IS DELAMINATED.

MINOR SPALLS WITH EXPOSED REBAR NEAR PORTALS. SEVERAL

AREAS OF MINOR SPALLING WITH EXPOSED REBAR ON CROWN

AND LINING. FOUR AREAS OF SPALLING, APPROXIMATELY 98', 135',

AND 210', AND 284' FROM NORTH PORTAL NEAR CROWN, HAVE

LOOSE CONCRETE WHICH POSES HAZARD TO MOTORISTS.

SEVERAL PATCHES OF PREVIOUS SPALLS HAVE FAILED.

MINOR CRACKING WITH EFFLORESCENCE AND LEAKAGE;

PARTICULARLY AT DRAIN CHASE LOCATIONS. PREVIOUS REPAIRS

OF DRAIN CHASES EVIDENT. SEVERAL CRACKS HAVE BEEN

INJECTED AND SEALED, BUT SHOW SIGN OF WATER INTRUSION.

59.2 MINOR EFFLORESCENCE WITH MINOR TO MODERATE VINE

GROWTH ON MASONRY OF BOTH PORTALS; MODERATE MORTAR

JOINT DETERIORATION ALSO PRESENT.

CRACK IN ROCK SHELF JUST BEYOND NORTH PORTAL ON WEST

SIDE. OPENING APPROXIMATELY 1/2" WIDE AND DEPTH UNKNOWN.

UP TO 1" ROCK LAYER DISPLACEMENT AT 17' FROM NORTH PORTAL.

AREA CONTAINING CRACK APPROXIMATELY 24' X 24'.

59.8 TWO REFLECTORS ARE MISSING OR DAMAGED ALONG EAST

LINING; ONE ALONG WEST LINING. MOST REFLECTORS ARE

MISSING FROM ALONG CENTERLINE OF ROADWAY STRIPING.

222.4 MINOR CRACKING OF PAVEMENT AT BOTH APPROACHES.

222.7 13'-11" VERTICAL CLEARANCE AND "TURN LIGHTS ON" SIGNS

POSTED AT NORTH APPROACH. DUE TO CLOSENESS BETWEEN

TUNNELS, 13-11" VERTICAL CLEARANCE SIGN IS POSTED AT SOUTH

APPROACH TO TUNNEL #146; ACTUAL VERTICAL CLEARANCE IS

14'-7". "FERRIN KNOB TUNNEL #2" SIGNS AT BOTH APPROACHES.

222.9 MINOR TO MODERATE DETERIORATION OF EDGE OF ROADWAY

STRIPING AT BOTH APPROACHES.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5140-145P

STRUCTURE IDENTIFICATION

(201) PARK: BLUE RIDGE PARKWAY (1) STATE: ....................................... 374 - NORTH CAROLINA (NC)

(202) STRUCTURE NAME: .......... FERRIN KNOB TUNNEL #2 (2) STATE HWY. AGENCY DIST:

(203) STRUCTURE KIND: ............3 - TUNNEL (3) COUNTY CODE: ........................ 089 - HENDERSON

(204) STRUCTURE NUMBER: ..... 5140-145P (4) CITY/PLACE CODE:

(205) NPS REGION: .................... 4 - SOUTHEAST (5) INVENTORY ROUTE:

(206) ROUTE CODE NUMBER: ... 1 (6) FEATURES INTERSECTED:....... FERRIN KNOB

(207) ROAD SECTION NO: .......... 145P (7) FACILITY CARRIED: .................. BLUE RIDGE PARKWAY

(208) NPS ROAD CLASS: ............ 1 - PRINCIPAL PARK ROAD (8) STATE STRUCTURE NO: .......... 5140145P0000000

(209) WITHIN NPS BNDRY?: ....... YES (9) LOCATION: ................................ 7.7 MILES TO NC ROUTE 191

(210) OPERATING UNIT: ............. GILLESPE (10) INV. RTE. - MIN. VERT. CLR: .. 13.92 FT (4.24 M)

(211) PROJECT NO(S): ................ 2S2, 2S9,2S1 (11) MILE POINT: ............................. 401.18 (KM PT 645.62)

(212) DRAWING NUMBERS: ....... (27) YEAR BUILT:

(21) MAINTAINED BY: ................. 66 - NATIONAL PARK SERVICE (106) YEAR RECONSTRUCTED:

(22) OWNER: ............................... 66 - NATIONAL PARK SERVICE (20) TOLL: ........................................ 3 - FREE ROAD

(37) HISTORICAL DESIGNATION: .. 5 - NOT ELIGIBLE

STRUCTURE DESCRIPTION, FOUNDATION, AND DECK TYPE

(43A) MAIN STR. MATERIAL: ..

(43B) MAIN STR. TYPE:

(45) NO. OF MAIN SPANS:

(48) MAX. SPAN LENGTH:

(49) STRUCTURE LENGTH:

(216A) ABUTMENT #1 FDN:

(216B) ABUTMENT #2 FDN:

(217A) PREDOM. PIER FDN.: ..

(217B) SECOND. PIER FDN: ...

(107) DECK TYPE:

1 - CONCRETE

18 - TUNNEL

29.4 FT (9.0 M)

457.0 FT (139.3 M)

6 - N/A

6 - N/A

6 - N/A

6 - N/A

N - NOT APPLICABLE

(44A) APPR. STR. MATERIAL: ........ 0 - OTHER

(44B) APPR. STR. TYPE: ................ 00 - OTHER

(46) NO. OF APPROACH SPANS: .. 0

(108) WEAR SURFACE/PROTECT SYSTEM:

A) TYPE WEARING SURFACE: .. 6 - BITUMINOUS

B) TYPE MEMBRANE: ................. 0 - NONE

C) TYPE PROTECTION: .............. 0 - NONE

(218) IS SALT USED?: ..................... NO

LOAD RATING AND POSTING

(31) DESIGN LOAD: ................. 0 - UNKNOWN (41) LOAD RESTRICTION: ......... A - OPEN, NO RESTRICTION

(66) INVENTORY RATING: ...... 0.0 TONS (0.0 METRIC TONS) (70) BRIDGE POSTING: .............. 5 - NO POSTING REQUIRED

(64) OPERATING RATING: ...... 0.0 TONS (0.0 METRIC TONS)

INSPECTION DATES

(90) INSPECTION DATE: 6/15 (91) FREQ. OF INSP: 24 MONTHS (92 / 93) CRITICAL FEATURE INSPECTION (CFI):

(219) ADD. STUDIES NEEDED: N - 0 - NONE (A) FRACTURE CRITICAL: ... NO

INSP. EVERY: MONTHS - LAST INSP. : (220) SPECIAL STUDY TYPE: 0 - NONE

(B) UNDERWATER: .............. NO

(221) SPECIAL STUDY DATE: INSP. EVERY: MONTHS - LAST INSP. :

(C) SPECIAL INSPECTION: .. NO

INSP. EVERY: MONTHS - LAST INSP. :

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5140-145P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(51) CURB TO CURB WIDTH: ........... 29.4 FT (9.0 M) (16) LATITUDE: ............................. 35°27'20.40"

(17) LONGITUDE: ......................... 82°40'26.50"

(19) DETOUR LENGTH: ............... 40 MI (64 KM)

(28A) LANES ON STRUCT:

(28B) LANES UNDER STRUCT: ... 02

(42A) SERVICE ON: ..................... 1 - HIGHWAY

(42B) SERVICE UNDER: .............. 1 - HIGHWAY

(29) AVG. DAILY TRAFFIC:

(30) YEAR OF ADT:

(114) FUTURE ADT:

(115) YEAR OF FUTURE ADT:

(101) PARALLEL STRUCTURE: ... N - NONE

(38) NAVIGATION CONTROL?: ... 0

(39) VERTICAL CLEARANCE: ...... 0.0 FT (0.0 M)

(40) HORIZ. CLEARANCE: ........... 0.0 FT (0.0 M)

(111) ABUT. OR PIER PROT:

LATERAL UNDERCLEARANCE:

(55) RIGHT: ....................... 0.0 FT (0.0 M)

(56) LEFT: ......................... 0.0 FT (0.0 M)

CONDITION AND APPRAISAL DATA, PROPOSED IMPROVEMENTS, AND COST

(58) DECK: ................................. N

(59) SUPERSTRUCTURE: .........N

(60) SUBSTRUCTURE: ..............N

(61) CHANNEL: .......................... N

(62) CULVERT: ........................... N

(222) APPROACHES:

(223) RETAINING WALL: ........... N

(36) TRAFFIC SAFETY FEAT: ... NNNN

(75A) TYPE OF WORK:

(75B) WORK DONE BY:

(76) IMPROVEMENT LENGTH: ..

(52) DECK WIDTH:

(32) APPR. ROADWAY WIDTH:

(213) APPR. PAVEMENT WIDTH:

LEFT SHOULDER:

RIGHT SHOULDER:

(33) BRIDGE MEDIAN:

(34) SKEW ANGLE:

(35) DECK FLARE?:

(47) TOTAL HORIZ. CLEARANCE:

(50) SIDEWALKS:

LEFT :

RIGHT :

(214) BRIDGE RAIL TYPE:

RAIL CONFIGURATION:

MATERIAL:

DESIGN TYPE:

(215) BRIDGE RAIL HEIGHT:

(53) MIN. VRT. CLEAR. OVER DECK:

(54) MIN. VRT. UNDERCLEARANCE:

0.0 FT (0.0 M)

29.0 FT (8.8 M)

22.0 FT (6.7 M)

8.0 FT (2.4 M)

8.0 FT (2.4 M)

0 - NO MEDIAN

0 °

NO

22.0 FT (6.7 M)

0.0 FT (0.0 M)

0.0 FT (0.0 M)

0 - N/A

0 - N/A

0 - N/A

0.00 FT (0.00 M)

14.08 FT (4.29 M)

14.08 FT (4.29 M)

(67) STRUCTURAL EVALUATION:

(68) DECK GEOMETRY:

(69) UNDERCLEARANCES:

(71) WATERWAY ADEQUACY:

(72) APPROACH ALIGNMENT:

(113) SCOUR CRITICAL:

(225) PURPOSE OF IMPROVEMENT:

(226) PRIORITY OF IMPROVEMENT:

(227) MAINTENANCE COST:

(228) REHAB./RECONSTR. COST: ...

(229) CONSTRUCTION COST:

N

N

N

N - Not over waterway.

1 - MAINTENANCE

D - MINOR

$6,000

$0

$0

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

1985-LINING REHABILITATION.

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

APPENDIX STRUCTURE NO. 5140-145P

PHOTOGRAPHS STRUCTURE NO. 5140-145P

PHOTO #1 - NORTH PORTAL

FLOW

PHOTO #2 - SOUTH PORTAL

PHOTO #3 - GENERAL UNDERSIDE VIEW LOOKING SOUTH

PHOTO #4 - GENERAL VIEW OF ROADWAY LOOKING SOUTH

PHOTO #5 - TYPICAL EFFLORESCENCE AT

RING STONES ON PORTALS, WEST SIDE OF

NORTH PORTAL SHOWN

PHOTO #6 - ACTIVE WATER LEAKAGE ON

WEST LINING NEAR NORTH PORTAL

PHOTO #7 - CRACKING WITH

EFFLORESCENCE ON WEST LINING

APPROXIMATELY 60' FROM NORTH PORTAL

PHOTO #8 - CRACKING WITH

EFFLORESCENCE ON EAST LINING

APPROXIMATELY 60' FROM NORTH PORTAL

PHOTO #9 - SPALLING WITH EXPOSED REBAR

AT CROWN APPROXIMATELY 90' FROM NORTH

PORTAL

PHOTO #10 - CRACKING WITH

EFFLORESCENCE AND SPALLING WITH

EXPOSED REBAR ON EAST LINING

APPROXIMATELY 98' FROM NORTH PORTAL

PHOTO #11 - DELAMINATION AND SPALLING

WITH EXPOSED REBAR ON EAST SIDE

APPROXIMATELY 100' FROM NORTH PORTAL;

NOTE PATCHED AREA

PHOTO #12 - TRANSVERSE CRACKING WITH

EFFLORESCENCE AND ACTIVE WATER

LEAKAGE APPROXIMATELY 115' FROM NORTH

PORTAL

PHOTO #13 - SPALLING WITH EXPOSED REBAR AT CROWN

APPROXIMATELY 135' FROM NORTH PORTAL

PHOTO #14 - SPALLING WITH EXPOSED REBAR AT CROWN

APPROXIMATELY 210' FROM NORTH PORTAL

PHOTO #15 - SPALLING WITH EXPOSED REBAR AT CROWN

APPROXIMATELY 280' FROM NORTH PORTAL

PHOTO #16 - SPALLING WITH EXPOSED REBAR ON EAST LINING

APPROXIMATELY 284' FROM NORTH PORTAL

PHOTO #17 - SPALLING ON EAST LINING

APPROXIMATELY 298' FROM NORTH PORTAL

PHOTO #18 - SPALLING WITH EXPOSED

REBAR NEAR CROWN ON WEST SIDE

APPROXIMATELY 233' FROM NORTH PORTAL

PHOTO #19 - SPALLING WITH EXPOSED REBAR NEAR CROWN ON

WEST SIDE APPROXIMATELY 233' FROM NORTH PORTAL

PHOTO #20 - SPALLING WITH EXPOSED REBAR ON EAST SIDE

APPROXIMATELY 340' FROM NORTH PORTAL

PHOTO #21 - SPALLING WITH EXPOSED REBAR AT CROWN

APPROXIMATELY 387' FROM NORTH PORTAL

PHOTO #22 - CRACKING WITH EFFLORESCENCE ON WEST SIDE

APPROXIMATELY 410' FROM NORTH PORTAL

PHOTO #23 - SPALLING ALONG

CONSTRUCTION JOINT NEAR CROWN ON

WEST SIDE APPROXIMATELY 433' FROM

NORTH PORTAL

PHOTO #24 - CRACKING WITH

EFFLORESCENCE ON WEST LINING ALONG

WEST SIDE AND AT DRAIN CHASE NEAR

SOUTH PORTAL; NOTE ALSO VEGETATION

GROWTH

PHOTO #25 - VINE GROWTH AND EFFLORESCENCE ON SOUTH PORTAL

RING STONES; WEST SIDE SHOWN

PHOTO #26 - CRACKING OF ROCK SHELF OUTSIDE OF NORTH PORTAL

ON WEST SIDE

PHOTO #27 - UP TO 1" DISPLACEMENT OF

ROCK SHELF LAYERS ~17' FROM NORTH

PORTAL, ON WEST SIDE