Bridge_Inspection_Rpt_STR_5140-140P.pdf

TUNNEL INSPECTION REPORT

CRAGGY FLATS TUNNEL

BLUE RIDGE PARKWAY THROUGH CRAGGY FLATS MOUNTAIN

BLUE RIDGE PARKWAY

NP

STRUCTURE NO. 5140-140P

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 6/9/15

Report prepared by: SP

MILE POINT: 365.44

Federal Highway Administration KILOMETER POINT: 588.10 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. 5140-140P

CRAGGY FLATS TUNNEL INSPECTION DATE: 6/9/15

TUNNEL IDENTIFICATION AND DESCRIPTION

LINING MATERIAL: ............... UNLINED / CONCRETE

SPRINGLINE LENGTH: ........ 29.3 FT (8.9 M)

CURB TO CURB WIDTH: ..... 29.3 FT (8.9 M)

PROJ./PLAN REF. NO: ......... 2P1,2P6,2M17 / NONE

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

STRUCTURE HISTORY: ...... 1956-NORTH LINING AND PORTAL;

UNLINED PORTION.

MINIMUM VERTICAL CLR: .... 14.5 FT (4.4 M)

STRUCT. TOTAL LENGTH: ... 403.0 FT (122.8 M)

YEAR BUILT:

YEAR RECONSTRUCTED:

1990-ROCKBOLTING AND SCREENING THROUGHOUT

LOCATION

BLUE RIDGE PARKWAY MILE POINT: ..................... 365.44 (KM PT 588.10)

STATE: .................................. NORTH CAROLINA LOCATION: 10.2 MILES TO NC ROUTE 128

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

FEATURE INTERSECTED: ... CRAGGY FLATS MOUNTAIN

STRUCTURE EVALUATION SUMMARY

This tunnel is in fair condition at this time. The most serious problem is water leakage, moderate at both portals, and minor along cracking of the concrete lining near both portals. In addition, there are a moderate deterioration of the drain chase near the north portal, and a leaking hole in the west concrete lining near the south portal. The leakage causes the roadway through the tunnel to become wet and slippery. This could cause icing of the entire roadway and create hazardous driving conditions in winter time.

Other problems include minor spalling with exposed rebar on the crown, and numerous missing or damaged reflectors throughout the tunnel.

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. 5140-140P

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 SEAL LEAKING CRACKS IN LINING NEAR EACH PORTAL. 1 LS $4,000 $4,000

59.8, 222.7 REPLACE MISSING AND DAMAGED REFLECTORS ON BOTH SIDES OF TUNNEL. 1 LS $3,000 $3,000

59.1 CLEAN EXPOSED REBAR ON TUNNEL LINING AND SEAL WITH APPROVED

PROTECTIVE COATING.

1 SF $500 $3,000

PRELIM. MAINTENANCE TOTAL : $10,000

ITEM

NO.

REHABILITATION/RECONSTRUCTION

(TYPICALLY NEEDED WITHIN 5 YEARS) QTY. UNIT UNIT

COST ESTIMATES

PRELIM. COST

REHAB. RECONSTR.

59.4 REPLACE DRAIN CHASE NEAR NORTH PORTAL. 45 LF $750 $36,000 $0

59 CONTRACT COSTS FOR MOBILIZATION, TRAFFIC CONTROL, AND

DESIGN/CONSTRUCTION ENGINEERING.

1 LS $24,000 $24,000 $0

PRELIM. REHABILITATION/RECONSTRUCTION TOTAL : $60,000 $0

COST ESTIMATE SUMMARY

PRELIM. MAINTENANCE TOTAL:

PRELIM. REHABILITATION TOTAL:

PRELIM. RECONSTRUCTION TOTAL: ...

TOTAL ITEMIZED COSTS:

$0 $60,000 $10,000

$70,000

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.)

$70,000

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

FIELD INSPECTION REPORT STRUCTURE NO. 5140-140P

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

G

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

F8. ALIGNMENT

F9. OTHER (ROCK AT PORTALS)

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 MODERATE LEAKAGE THROUGH LINING IN TWO CRACKED AREAS

NEAR EACH PORTAL. MINOR TO MODERATE DETERIORATION AND

LEAKAGE ALONG DRAIN CHASE NEAR NORTH PORTAL. HOLE AND

ACTIVE LEAKAGE AT WEST CONCRETE LINING NEAR SOUTH

PORTAL.

MODERATE CRACKING WITH EFFLORESCENCE ON CONCRETE

LINING AT BOTH PORTALS. MINOR SPALLING WITH EXPOSED

REBAR ON CROWN NEAR SOUTH PORTAL AND SOUTH END OF

NORTH CONCRETE LINING.

METAL SCREENING/ROCKBOLTING THROUGHOUT UNLINED

PORTION OF TUNNEL. MINOR RUSTING OF EXPOSED PORTIONS OF

ROCKBOLTS. FALLEN ROCKS ON METAL SCREEN NEAR SOUTH

PORTAL, EAST SIDE.

MOSS AND VEGETATION GROWTH IN MASONRY MORTAR JOINTS AT

BOTH PORTALS. WATER LEAKAGE ONTO ROADWAY AT BOTH

PORTALS.

ROADWAY DAMP THROUGHOUT TUNNEL.

59.2 MINOR TO MODERATE EFFLORESCENCE ON MASONRY JOINTS AT

BOTH PORTALS. MINOR CRACKING OF JOINTS WITH VEGETATION

GROWTH. LARGE BUSH GROWING FROM TOP OF SOUTH PORTAL.

59.5 FALLEN ROCK ALONG EAST CURBLINE. MINOR GRAVEL AND SOIL

ACCUMULATION ALONG BOTH CURBLINES.

59.8 THREE MISSING OR DAMAGED REFLECTORS ALONG EAST SIDE OF

TUNNEL; FOUR ALONG WEST SIDE. REFLECTORS AT PORTALS

HAVE FADED.

222.7 13'-5" VERTICAL CLEARANCE SIGN POSTED AT SOUTH APPROACH.

13'-7" VERTICAL CLEARANCE SIGN POSTED AT NORTH APPROACH.

"CRAGGY FLATS TUNNEL" SIGN AT SOUTH APPROACH; SIGN

MISSING AND POST DISPLACED AT NORTH APPROACH. "TURN

LIGHTS ON" SIGNS AT BOTH APPROACHES.

222.9 DEEP VOIDS AND APPARENTLY FRESH CRACKING OF ROCK AT EAST

SIDE OF SOUTH PORTAL, NEAR ROADWAY.

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.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5140-140P

STRUCTURE IDENTIFICATION

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

(202) STRUCTURE NAME: .......... CRAGGY FLATS TUNNEL (2) STATE HWY. AGENCY DIST:

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

(204) STRUCTURE NUMBER: ..... 5140-140P (4) CITY/PLACE CODE:

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

(206) ROUTE CODE NUMBER: ... 1 (6) FEATURES INTERSECTED:....... CRAGGY FLATS MOUNTAIN

(207) ROAD SECTION NO: .......... 140P (7) FACILITY CARRIED: .................. BLUE RIDGE PARKWAY

(208) NPS ROAD CLASS: ............ 1 - PRINCIPAL PARK ROAD (8) STATE STRUCTURE NO: .......... 5140140P0000000

(209) WITHIN NPS BNDRY?: ....... YES (9) LOCATION: ................................ 10.2 MILES TO NC ROUTE 12

(210) OPERATING UNIT: ............. GILLESPE (10) INV. RTE. - MIN. VERT. CLR: .. 14.33 FT (4.37 M)

(211) PROJECT NO(S): ................ 2P1,2P6,2M17 (11) MILE POINT: ............................. 365.44 (KM PT 588.10)

(212) DRAWING NUMBERS: ....... NONE (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:

0 - OTHER

18 - TUNNEL

29.3 FT (8.9 M)

403.0 FT (122.8 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: ......... 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. 5140-140P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(51) CURB TO CURB WIDTH: ........... 29.3 FT (8.9 M) (16) LATITUDE: ............................. 35°41'16.50"

(17) LONGITUDE: ......................... 82°23'00.70"

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

(28A) LANES ON STRUCT:

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

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

(42B) SERVICE UNDER: .............. 0 - OTHER

(29) AVG. DAILY TRAFFIC:

(30) YEAR OF ADT:

(114) FUTURE ADT:

(115) YEAR OF FUTURE ADT:

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

(38) NAVIGATION CONTROL?: ... N

(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)

(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)

38.0 FT (11.6 M)

22.0 FT (6.7 M)

8.0 FT (2.4 M)

8.0 FT (2.4 M)

0 - NO MEDIAN

0 °

NO

29.3 FT (8.9 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)

14.50 FT (4.42 M)

14.50 FT (4.42 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: ..

(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.

2 - REHAB/RECONSTRUCTION

D - MINOR

$10,000

$60,000

$0

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

1956-NORTH LINING AND PORTAL; 1990-ROCKBOLTING AND SCREENING THROUGHOUT UNLINED PORTION.

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

APPENDIX STRUCTURE NO. 5140-140P

PHOTOGRAPHS STRUCTURE NO. 5140-140P

PHOTO #1 - NORTH PORTAL

PHOTO #2 - SOUTH PORTAL

PHOTO #3 - GENERAL VIEW OF ROADWAY LOOKING NORTH

PHOTO #4 - GENERAL UNDERSIDE VIEW LOOKING NORTH; NOTE

TYPICAL CONCRETE LINED SECTION AT ENDS

PHOTO #5 - WATER LEAKAGE, WATER

STAINING, AND EFFLORESCENCE ALONG

WEST SIDE OF NORTH PORTAL

PHOTO #6 - CRACKING WITH

EFFLORESCENCE ON CONCRETE LINING AT

WEST SIDE NEAR NORTH PORTAL

PHOTO #7 - SPALLING WITH EXPOSED REBAR

AT SOUTH END OF NORTH LINING, WEST SIDE;

NOTE ALSO CRACKING WITH

EFFLORESCENCE ON LINING

PHOTO #8 - CRACKING WITH

EFFLORESCENCE ON EAST SIDE OF NORTH

LINING; NOTE SPALLING AND LEAKAGE ALONG

DRAIN CHASE

PHOTO #9 - VERTICAL AND DIAGONAL

CRACKING WITH EFFLORESCENCE OF

CONCRETE LINING ON EAST SIDE NEAR

NORTH PORTAL

PHOTO #10 - GENERAL UNDERSIDE VIEW OF

UNLINED SECTION. LOOKING NORTH

PHOTO #11 - TYPICAL RUSTED ROCKBOLTING

PHOTO #12 - MISSING AND DISPLACED REFLECTORS ALONG WEST

CURBLINE

PHOTO #13 - CRACKING WITH

EFFLORESCENCE AND SPALLING WITH

EXPOSED REBAR AT SOUTH CONCRETE

LINING

PHOTO #14 - WATER LEAKAGE AND

VEGETATION GROWTH ABOVE SOUTH

PORTAL; NOTE EFFLORESCENCE ON RING

STONES

PHOTO #15 - CRACKING WITH

EFFLORESCENCE ON CONCRETE LINING AT

EAST SIDE NEAR SOUTH PORTAL

PHOTO #16 - HOLE IN LINING AND ACTIVE

WATER LEAKAGE AT WEST SIDE NEAR SOUTH

PORTAL; NOTE ALSO CRACKING WITH

EFFLORESCENCE

PHOTO #17 - DEBRIS ACCUMULATION ALONG

EAST CURBLINE NEAR SOUTH PORTAL

PHOTO #18 - BENT REFLECTOR AT

SOUTHWEST END

PHOTO #19 - DEEP VOIDS IN ROCK AT EAST

END OF SOUTH PORTAL NEAR ROADWAY;

NOTE APPARENTLY FRESH CRACKS IN ROCK

PHOTO #20 - SIGNAGE AT SOUTH APPROACH

PHOTO #21 - SIGNAGE AT NORTH APPROACH