Bridge_Inspection_Rpt_STR_5140-144P.pdf

TUNNEL INSPECTION REPORT

FERRIN KNOB TUNNEL #1

BLUE RIDGE PARKWAY THROUGH FERRIN KNOB

BLUE RIDGE PARKWAY

NP

STRUCTURE NO. 5140-144P

INSPECTION TYPE: ROUTINE

INSPECTION DATE: 6/12/15

Report prepared by: SP

MILE POINT: 400.68

Federal Highway Administration KILOMETER POINT: 644.81 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. 5140-144P

FERRIN KNOB TUNNEL #1 INSPECTION DATE: 6/12/15

TUNNEL IDENTIFICATION AND DESCRIPTION

LINING MATERIAL: ............... CONCRETE MINIMUM VERTICAL CLR: .... 14.2 FT (4.3 M)

SPRINGLINE LENGTH: ........ 29.1 FT (8.9 M) STRUCT. TOTAL LENGTH: ... 605.0 FT (184.4 M)

CURB TO CURB WIDTH: ..... 29.1 FT (8.9 M) YEAR BUILT:

PROJ./PLAN REF. NO: ......... 2S2,2S9,2S14 / YEAR RECONSTRUCTED:

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

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

LOCATION

BLUE RIDGE PARKWAY MILE POINT: ..................... 400.68 (KM PT 644.81)

STATE: .................................. NORTH CAROLINA LOCATION: 7.3 MILES TO NC ROUTE 191

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

FEATURE INTERSECTED: ... FERRIN KNOB

STRUCTURE EVALUATION SUMMARY

This concrete lined tunnel is in good condition overall. The most pressing issues are the posted vertical clearance at the south approach is higher than the actual one; and the loose concrete on the crown, approximately 500' from the north portal, which poses a hazard to motorists traveling through the tunnel. Other areas of loose concrete and spalling, missing reflectors, and the drain chases near each portal have been repaired in recent years.

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. 5140-144P

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 AT CROWN APPROXIMATELY 500' FROM

NORTH PORTAL.

1 LS $1,000 $1,000

222.7 REPLACE 14'-9" VERTICAL CLEARANCE SIGN AT SOUTH APPROACH WITH 14'-0"

SIGN.

1 LS $500 $500

PRELIM. MAINTENANCE TOTAL : $1,500

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 $1,500

$1,500

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.)

$1,500

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

FIELD INSPECTION REPORT STRUCTURE NO. 5140-144P

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

G8. 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

G9. 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

ITEM REFERENCE AND REMARKS

59.1 SEVERAL MINOR SPALLS WITH EXPOSED REBAR ALONG CROWN.

MINOR SPALLING AND ONE AREA OF LOOSE CONCRETE ON CROWN

APPROXIMATELY 500' FROM NORTH PORTAL.

MINOR CRACKING WITH EFFLORESCENCE AND LEAKAGE

THROUGHOUT TUNNEL. SEVERAL CRACKS HAVE BEEN INJECTED

AND SEALED BEFORE PREVIOUS INSPECTION. MINOR CRACKING

AT BASE WALLS ALONG BOTH SIDES OF TUNNEL.

MINOR SCRAPES ON LINING THROUGH CURVE.

59.2 MODERATE EFFLORESCENCE ON RING STONE MASONRY JOINTS AT

NORTH PORTAL; MINOR AT SOUTH PORTAL. MINOR VEGETATION

GROWTH ON SOUTH PORTAL, WEST SIDE.

59.8 FEW REFLECTORS MISSING AT MIDSECTION OF WEST WALL.

222.7 14'-9" (SOUTH APPROACH) AND 14'-3" (NORTH APPROACH) VERTICAL

CLEARANCE AND "TURN LIGHTS ON" SIGNS POSTED AT BOTH

APPROACHES. "FERRIN KNOB TUNNEL NO. 1" SIGN POSTED AT

SOUTH APPROACH.

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. 5140-144P

STRUCTURE IDENTIFICATION

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

(202) STRUCTURE NAME: .......... FERRIN KNOB TUNNEL #1 (2) STATE HWY. AGENCY DIST:

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

(204) STRUCTURE NUMBER: ..... 5140-144P (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: .......... 144P (7) FACILITY CARRIED: .................. BLUE RIDGE PARKWAY

(208) NPS ROAD CLASS: ............ 1 - PRINCIPAL PARK ROAD (8) STATE STRUCTURE NO: .......... 5140144P0000000

(209) WITHIN NPS BNDRY?: ....... YES (9) LOCATION: ................................ 7.3 MILES TO NC ROUTE 191

(210) OPERATING UNIT: ............. GILLESPE (10) INV. RTE. - MIN. VERT. CLR: .. 14.00 FT (4.27 M)

(211) PROJECT NO(S): ................ 2S2,2S9,2S14 (11) MILE POINT: ............................. 400.68 (KM PT 644.81)

(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

29.1 FT (8.9 M)

605.0 FT (184.4 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: .. 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. 5140-144P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(51) CURB TO CURB WIDTH: ........... 29.1 FT (8.9 M) (16) LATITUDE: ............................. 35°27'18.80"

(17) LONGITUDE: ......................... 82°39'59.60"

(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)

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

29.1 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)

14.17 FT (4.32 M)

14.17 FT (4.32 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

$1,500

$0

$0

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

1985-LINING REHABILITATION.

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

APPENDIX STRUCTURE NO. 5140-144P

PHOTOGRAPHS STRUCTURE NO. 5140-144P

PHOTO #1 - NORTH PORTAL

PHOTO #2 - SOUTH PORTAL; NOTE VEGETATION GROWTH IN

MASONRY JOINTS AT WEST SIDE

PHOTO #3 - GENERAL UNDERSIDE VIEW LOOKING SOUTH

PHOTO #4 - GENERAL VIEW OF ROADWAY LOOKING SOUTH

PHOTO #5 - TYPICAL EFFLORESCENCE ALONG

RING STONES, EAST SIDE AT NORTH PORTAL

SHOWN

PHOTO #6 - WATER LEAKAGE ALONG WEST

DRAIN CHASE NEAR NORTH PORTAL

PHOTO #7 - WATER LEAKAGE ALONG EAST

SIDE OF DRAIN CHASE APPROXIMATELY 76'

FROM NORTH PORTAL, SIMILAR AT WEST SIDE

PHOTO #8 - ACTIVE WATER LEAKAGE AND

CRACKING WITH EFFLORESCENCE

APPROXIMATELY 98' FROM NORTH PORTAL

PHOTO #9 - CRACKING WITH

EFFLORESCENCE AND LEAKAGE ON WEST

LINING APPROXIMATELY 330' FROM NORTH

PORTAL

PHOTO #10 - SPALLING WITH EXPOSED

REBAR ON EAST LINING APPROXIMATELY 389'

FROM NORTH PORTAL

PHOTO #11 - DELAMINATION AND SPALLING

WITH EXPOSED REBAR AT CROWN 429' FROM

NORTH PORTAL

PHOTO #12 - DELAMINATION AND SPALLING

WITH EXPOSED REBAR AT CROWN 484' FROM

NORTH PORTAL

PHOTO #13 - REPAIRED DRAIN CHASE ON WEST WALL

APPROXIMATELY 542' FROM NORTH PORTAL; NOTE CRACKING WITH

EFFLORESCENCE ON LINING

PHOTO #14 - CRACKING WITH EFFLORESCENCE AT THE CROWN AT

SOUTH PORTAL

PHOTO #15 - CLEARANCE SIGN AT SOUTH APPROACH; NOTE

CLEARANCE POSTED HIGHER THAN ACTUAL ONE (PHOTO FROM

6/26/13 INSPECTION)