Bridge_Inspection_Rpt_STR_5140-142P.pdf

TUNNEL INSPECTION REPORT

GRASSY KNOB TUNNEL

BLUE RIDGE PARKWAY THROUGH GRASSY KNOB MOUNTAIN

BLUE RIDGE PARKWAY

NP

STRUCTURE NO. 5140-142P

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 6/10/15

Report prepared by: SP

MILE POINT: 397.05

Federal Highway Administration KILOMETER POINT: 638.97 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. 5140-142P

GRASSY KNOB TUNNEL INSPECTION DATE: 6/10/15

TUNNEL IDENTIFICATION AND DESCRIPTION

LINING MATERIAL: ............... CONCRETE MINIMUM VERTICAL CLR: .... 14.3 FT (4.4 M)

SPRINGLINE LENGTH: ........ 29.4 FT (9.0 M) STRUCT. TOTAL LENGTH: ... 802.0 FT (244.4 M)

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

PROJ./PLAN REF. NO: ......... 2S1,2S9,2S14 / YEAR RECONSTRUCTED:

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

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

LOCATION

BLUE RIDGE PARKWAY MILE POINT: ..................... 397.05 (KM PT 638.97)

STATE: .................................. NORTH CAROLINA LOCATION: 3.5 MILES TO NC ROUTE 191

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

FEATURE INTERSECTED: ... GRASSY KNOB MOUNTAIN

STRUCTURE EVALUATION SUMMARY

This concrete lined tunnel is in good condition overall, with only minor problems at this time. These include several areas of minor exposed rebar on the concrete tunnel lining, mostly in the crown areas, cracking with efflorescence along both sides of the tunnel lining, and numerous missing reflectors.

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. 5140-142P

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.

59.8 REPLACE MISSING AND DAMAGED TUNNEL REFLECTORS AS NECESSARY. 1 LS $4,000 $4,000

59.1 CLEAN EXPOSED REBAR ON LINING AND SEAL WITH APPROVED PROTECTIVE

COATING.

5 SF $500 $3,000

PRELIM. MAINTENANCE TOTAL : $7,000

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 $7,000

$7,000

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.)

$7,000

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

FIELD INSPECTION REPORT STRUCTURE NO. 5140-142P

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 7

G

2. PORTALS

1. LINING

G

N3. CURBS AND SIDEWALKS

G4. DRAINS AND DRAINAGE

G5. WEARING SURFACE

G6. RIDEABILITY

N7. LIGHTING

P8. 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

N9. OTHER

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

ITEM REFERENCE AND REMARKS

59.1,4 MINOR SPALLING WITH EXPOSED REBAR ON CROWN

APPROXIMATELY 67', 250', 612', AND 694' FROM NORTH PORTAL.

EXPOSED REBAR ON PATCHED AREA ON EAST LINING

APPROXIMATELY 467' FROM NORTH PORTAL.

MINOR LEAKAGE AND STAINING ALONG DRAIN CHASE NEAR SOUTH

PORTAL.

MINOR CRACKING WITH EFFLORESCENCE THROUGHOUT TUNNEL.

COLLISION SCRAPES ALONG LINING THROUGH CURVE.

59.2 MINOR TO MODERATE EFFLORESCENCE ON MASONRY RING

STONES. MODERATE VINE GROWTH ON BOTH PORTAL MASONRY.

59.8 MISSING OR DAMAGED REFLECTORS ALONG BOTH SIDES OF

TUNNEL. MISSING REFLECTORS ALONG CENTER LINE OF

ROADWAY.

222.4 MINOR BROKEN PAVEMENT AND SPOT SETTLEMENT, JUST SOUTH

OF SOUTH PORTAL ON WEST CURBLINE.

222.7 13'-10" VERTICAL CLEARANCE AND "TURN LIGHTS ON" SIGNS

POSTED AT BOTH APPROACHES. "GRASSY KNOB TUNNEL".

TRAFFIC SAFETY RATING CODES

N

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

Meets currently acceptable standards.

Not applicable or a safety feature is not required.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5140-142P

STRUCTURE IDENTIFICATION

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

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

(203) STRUCTURE KIND: ............3 - TUNNEL (3) COUNTY CODE: ........................ 021 - BUNCOMBE

(204) STRUCTURE NUMBER: ..... 5140-142P (4) CITY/PLACE CODE:

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

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

(207) ROAD SECTION NO: .......... 142P (7) FACILITY CARRIED: .................. BLUE RIDGE PARKWAY

(208) NPS ROAD CLASS: ............ 1 - PRINCIPAL PARK ROAD (8) STATE STRUCTURE NO: .......... 5140142P0000000

(209) WITHIN NPS BNDRY?: ....... YES (9) LOCATION: ................................ 3.5 MILES TO NC ROUTE 191

(210) OPERATING UNIT: ............. GILLESPE (10) INV. RTE. - MIN. VERT. CLR: .. 13.83 FT (4.22 M)

(211) PROJECT NO(S): ................ 2S1,2S9,2S14 (11) MILE POINT: ............................. 397.05 (KM PT 638.97)

(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)

802.0 FT (244.4 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: .. 2 - INTEGRAL CONCRETE

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: ......... R - POSTED (OTHER)

(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. 5140-142P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(51) CURB TO CURB WIDTH: ........... 29.4 FT (9.0 M) (16) LATITUDE: ............................. 35°28'12.70"

(17) LONGITUDE: ......................... 82°37'19.90"

(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)

30.0 FT (9.1 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)

14.33 FT (4.37 M)

14.33 FT (4.37 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

$7,000

$0

$0

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

1985-LINING REHABILITATION.

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

APPENDIX STRUCTURE NO. 5140-142P

PHOTOGRAPHS STRUCTURE NO. 5140-142P

PHOTO #1 - NORTH PORTAL

PHOTO #2 - SOUTH PORTAL

PHOTO #3 - GENERAL ROADWAY VIEW

LOOKING SOUTH; NOTE MISSING

REFLECTORS ALONG CENTER LINE AND

ALONG BOTH SIDES OF TUNNEL; NOTE ALSO

COLLISION SCRAPES

PHOTO #4 - TYPICAL EFFLORESCENCE ON

RING STONES, WEST SIDE OF NORTH PORTAL

SHOWN

PHOTO #5 - ALGAE GROWTH ON CONCRETE LINING, EAST LINING AT

NORTH PORTAL SHOWN

PHOTO #6 - CRACKING WITH EFFLORESCENCE ON WEST LINING NEAR

NORTH PORTAL

PHOTO #7 - SPALLING WITH EXPOSED REBAR

ON CROWN APPROXIMATELY 67' FROM NORTH

PORTAL

PHOTO #8 - SPALLING WITH EXPOSED REBAR

ON CROWN APPROXIMATELY 250' FROM

NORTH PORTAL

PHOTO #9 - CRACKING WITH

EFFLORESCENCE ON WEST LINING

APPROXIMATELY 366' FROM NORTH PORTAL

PHOTO #10 - EXPOSED REBAR AND

DELAMINATION ON PATCHED AREA AT EAST

LINING APPROXIMATELY 467' FROM NORTH

PORTAL

PHOTO #11 - CRACKING WITH

EFFLORESCENCE AND SPALLING WITH

EXPOSED REBAR ON WEST LINING

APPROXIMATELY 512' FROM NORTH PORTAL

PHOTO #12 - CRACKING WITH

EFFLORESCENCE ON EAST LINING

APPROXIMATELY 530' FROM NORTH PORTAL

PHOTO #13 - CRACKING WITH EFFLORESCENCE ON WEST LINING

APPROXIMATELY 558' FROM NORTH PORTAL

PHOTO #14 - SPALLING WITH EXPOSED REBAR ON CROWN

APPROXIMATELY 612' FROM NORTH PORTAL

PHOTO #15 - SPALLING WITH EXPOSED

REBAR ON CROWN APPROXIMATELY 694'

FROM NORTH PORTAL

PHOTO #16 - STAINING AND LEAKAGE ALONG

DRAIN CHASE ON EAST SIDE NEAR SOUTH

PORTAL; NOTE ALSO CRACKING AND

EFFLORESCENCE ON EAST WALL

PHOTO #17 - CRACKING WITH

EFFLORESCENCE ON WEST SIDE

APPROXIMATELY 740' FROM NORTH PORTAL;

NOTE ALSO LEAKAGE AND WATER STAINING

AT BASE OF WALL NEAR DRAIN CHASE CHASE

PHOTO #18 - CRACKING WITH

EFFLORESCENCE ON WEST WALL ALONG

DRAIN CHASE APPROXIMATELY 76' FROM

SOUTH PORTAL

PHOTO #19 - CRACKING WITH

EFFLORESCENCE ON WEST LINING AT SOUTH

PORTAL

PHOTO #20 - TYPICAL VINE GROWTH ON

SOUTH PORTAL, WEST SIDE SHOWN

PHOTO #21 - VEGETATION GROWTH ABOVE SOUTH PORTAL

PHOTO #22 - BROKEN PAVEMENT ALONG CURBLINE ON SOUTHBOUND

LANE AT SOUTH APPROACH