B08_Att_12_Point_Bonita_Suspension_Bridge_Collins_Report_0002.pdf
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- PAINT THE POINT BONITA SUSPENSION BRIDGE
- Solicitation number
- 140P8624R0017
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This document is a bridge inspection report for the Point Bonita Suspension Bridge located in the Golden Gate National Recreation Area in California. The report provides a detailed assessment of the condition of the bridge, including the main suspension and wind cables, timber decking and superstructure, and concrete abutments and retaining walls. Key issues identified include heavy salt buildup and minor to moderate corrosion on the cables and connection hardware, moderate erosion and cracking of the northwest retaining wall, and spalling on the west approach slab. The report recommends several rehabilitation measures, including cleaning and applying a corrosion protection system to the cables, repairing the undermined retaining wall, and sealing exposed rebar on the approach slab. The preliminary cost estimate for these repairs is $28,000.
The related federal contract opportunity is for painting the Point Bonita Suspension Bridge. The National Park Service at Golden Gate National Recreation Area has a requirement to apply a new protective coating to the bridge. This appears to be a standalone service contract opportunity separate from the bridge inspection and maintenance work described in the report.
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STRUCTURE SUMMARY STRUCTURE NO. 8140-006T
POINT BONITA SUSPENSION BRIDGE INSPECTION DATE: 8/8/18
BRIDGE IDENTIFICATION AND DESCRIPTION
MAIN SPAN MATERIAL: ....... WOOD or TIMBER NO. OF MAIN SPANS:
MAIN SPAN TYPE: ............... SUSPENSION NO. OF APPR. SPANS:
# OF BEAMS, MAIN SPAN: .. 2 STRUCT. TOTAL LENGTH: .. 156.0 FT (47.5 M)
DECK TYPE: ......................... WOOD OR TIMBER MAX. SPAN LENGTH: .......... 156.0 FT (47.5 M)
WEARING SURFACE: .......... NONE DECK WIDTH: ...................... 4.5 FT (1.4 M)
ABUT. FOUNDATIONS: ........ SPREAD FTG ON BEARING MAT'L CURB TO CURB WIDTH: ..... 4.2 FT (1.3 M)
PIER FOUNDATION(S): ........ N/A YEAR BUILT:
ABUTMENT / PIER MAT'L: ... WOOD OR TIMBER YEAR RECONSTRUCTED: .. 2012
PROJ./PLAN REF. NO: ......... UNKNOWN / D1776 SKEW ANGLE: ..................... 0 °
NPS ROAD CLASS: .............. 6 - RESTRICTED FRACTURE CRITICAL: ........ YES
STRUCTURE HISTORY: ...... 2012-BRIDGE REPLACED.
LOCATION
GOLDEN GATE NATIONAL RECREATION AREA MILE POINT:
STATE: ................................. CALIFORNIA LOCATION: Point Bonita Lighthouse. Key required for access at Structure No. 8140-011T. FACILITY CARRIED: ............ POINT BONITA TRAIL
FEATURE INTERSECTED: .. INLET
STRUCTURE EVALUATION SUMMARY
This timber suspension trail bridge is in satisfactory condition overall. The main problem is heavy salt deposit build up and minor to moderate surface corrosion throughout on the main suspension and wind (sway) cable systems and connection hardware. Other problems include moderate erosion and undermining of the northwest retaining wall, with some moderate cracking of the wall visible above this area and moderate spalling with exposed rebar along the north side of the west approach slab.
Corrective measures should be taken as outlined in this report to prevent the possible development of more serious or costly problems in the future.
INSPECTION TEAM: E. MILTNER, J. M. BERG
CONDITION ASSESSMENT:
ED MILTNER, P.E., FIELD TEAM LEADER
REPORT REVIEW:
MARCUS MILLER, P.E., BRIDGE INSPECTION ENGINEER 703-404-6252
REPORT APPROVAL: DATE: 2/22/19
JORGOMAI CEESAY, PH.D., P.E., BIP SUPERVISORY ENGINEER 703-404-6244
RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 8140-006T
A (Critical) - Structure is closed, in imminent danger of collapse, or presents a critical safety hazard.
B (Major) - Structure exhibits severe deterioration, presents a safety hazard, or is designated a high priority due to age and/or condition.
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.
D 226 PRIORITY OF IMPROVEMENT
ITEM
NO.
ROUTINE MAINTENANCE QTY. UNIT UNIT
COST
PRELIM.
COST
ESTIMATE
PRELIM. MAINTENANCE TOTAL :
ITEM
NO.
REHABILITATION/RECONSTRUCTION
(TYPICALLY NEEDED WITHIN 5 YEARS)
QTY. UNIT
UNIT
COST
PRELIM. COST
ESTIMATES
REHAB. RECONSTR.
223.1,4 REPAIR AREA OF UNDERMINING AT NORTHWEST RETAINING WALL.
CLEAN AND EPOXY INJECT CRACKING OF WALL ABOVE AREA OF
UNDERMINING.
1 LS $6,000 $6,000 $0
222.1 CLEAN AND SEAL EXPOSED REBAR ON WEST APPROACH SLAB (AT
RETAINING WALL) WITH APPROVED PROTECTIVE COATING.
1 LS $2,000 $2,000 $0
59.7,11 CLEAN CORROSION AND SALT DEPOSIT BUILD-UP FROM CABLES.
APPLY CORROSION PROTECTION SYSTEM TO CABLES AND
CONNECTION HARDWARE.
1 LS $20,000 $20,000 $0
CONTRACT COST FOR MOBILIZATION, TRAFFIC CONTROL, AND
DESIGN CONSTRUCTION ENGINEERING (70% TOTAL REHAB COST)
PLUS PARK LOCATION FACTOR.
0 $0 $0 $0
PRELIM. REHABILITATION/RECONSTRUCTION TOTAL : $28,000 $0
PRELIMINARY ESTIMATE TOTAL* : ........................................... $28,000
(*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.)
REMARKS: Cost estimates assume that recommended actions will be combined with similar work being performed on other structures.
FIELD INSPECTION REPORT STRUCTURE NO. 8140-006T
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 sec ion 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.
(ELECTRIC LINE)
G N N G G G F N G
F G
(CABLE SYSTEM)
G G N G G F
N
N
G
G
58.3 ISOLATED AREAS OF DECK PAINT WORN OFF TIMBER PLANKS.
58.6, 59.5 MINOR RUST STAINING ON TRUSS MEMBERS IN AREAS WHERE
BRACKETS INSTALLED TO SUPPORT HORIZONTAL RAILING CABLES.
58.6, 59.7, 60.12
PAINTED TIMBER COMPONENTS IN GOOD CONDITION.
58.8 2" AND 2-1/2" DIAMETER UTILITY PIPES MOUNTED ON NORTH SIDE
OF BRIDGE; MODERATE SURFACE RUSTING OF PIPES
THROUGHOUT.
59.4,7 CRACKED PAINT ON SEVERAL FLOORBEAMS NEAR EAST END.
59.7,11 PAINTED MAIN SUSPENSION AND WIND (SWAY) CABLE SYSTEMS
AND CONNECTION HARDWARE HAVE AREAS OF MINOR TO
MODERATE SURFACE CORROSION THROUGHOUT. HEAVY SALT
DEPOSITS BUILT-UP ON ALL CABLES.
MAIN SPAN SUSPENSION CABLES & WIND (SWAY) CABLES &
VERTICAL SUSPENSION CABLES COATED WITH CORROSION
INHIBITOR. ALL ENDS OF MAIN CABLE ANCHORAGES ARE COVERED
WITH PVC PIPE AND RUBBER GASKETS.
59.9 SLIGHT DEFLECTION AND MOVEMENT OF SUPERSTRUCTURE
UNDER FOOT TRAFFIC AND WIND LOADING COMBINATION.
60.12 BIRD CONTROL SPIKES ON TOP OF BOTH TOWERS.
1. BREASTWALLS OR COLUMNS G
2. PILE BENTS N
3. CAPS AND/OR BEARING SEATS G
4. BACKWALLS AND/OR BULKHEADS N
5. FOUNDATIONS (BURIED) N
6. WINGWALLS N
7. WEEP HOLES N
8. EXPANSION JOINTS N
9. EROSION AND/OR SCOUR G
10. SETTLEMENT OR DEFLECTION G
11. SLOPE PROTECTION N
12. OTHER (TOWERS) G
PIER(S)
N 13. WALLS AND/OR COLUMNS
N 14. PILE BENTS
N 15. CAPS AND/OR BEARING SEATS
N 16. FOUNDATIONS
N 17. EROSION AND/OR SCOUR
N 18. SETTLEMENT OR DEFLECTION
N 19. OTHER
FIELD INSPECTION REPORT STRUCTURE NO. 8140-006T
ITEM REFERENCE AND REMARKS
61. CHANNEL 7
1. ALIGNMENT G
2. EROSION AND/OR SCOUR G
3. CHANNEL PROTECTION N
4. WATERWAY OBSTRUCTIONS G
5. OTHER N
6. ADEQUACY OF OPENING SUFF
7. NORMAL VELOCITY HIGH
8. AVERAGE CLEAR OPENING 100 FT.
9. STREAM BED COMPOSITION :
ROCK
222. APPROACHES 6
1. APPROACH SLABS
2. RELIEF JOINTS
3. APPROACH GUARDRAIL
4. SURFACING
5. EROSION
6. SETTLEMENT
7. SIGNS
8. ALIGNMENT
9. OTHER
F N G G G G G G N
223. RETAINING WALL 5
1. WALL
2. WEEP HOLES
3. FOUNDATION
4. EROSION AND/OR SCOUR
5. SETTLEMENT OR DEFLECTION
6. OTHER
F N N F G N
36. TRAFFIC AND SAFETY FEATURES
A. BRIDGE RAILINGS
B. TRANSITIONS
C. APPROACH GUARDRAILS
D. APPROACH GUARDRAIL ENDS
N N N N
222.1 MODERATE SPALLING, UP TO 6' LONG, WITH EXPOSED REBAR
ALONG NORTH SIDE OF WEST APPROACH SLAB; APPROXIMATELY 2'
L X 1' W SPALL IS RESTING ON UTILITY CONDUIT IN THIS LOCATION.
MODERATE DIAGONAL AND MAP CRACKING (UP TO 1/4" WIDE)
BETWEEN APPROACH SLAB AND SUPPORT WALL.
222.3 METAL HANDRAIL WITH WIRE MESH ATTACHED TO HANDRAIL AT
WEST APPROACH. TREX COMPOSITE RAIL SYSTEM INSTALLED AT
EAST APPROACH.
222.7 "MAXIMUM VISITORS BEYOND THIS POINT 49" SIGN MOUNTED TO
NORTH LEG OF EAST TOWER.
223.1,4 MODERATE EROSION HAS RESULTED IN UNDERMINING OF NORTH
RETAINING WALL AT WEST APPROACH (APPROXIMATELY 15' LONG X
1' HIGH X UP TO 1.5' DEEP). MODERATE HORIZONTAL AND VERTICAL
CRACKING ALONG NORTH SIDE OF RETAINING WALL OVER
UNDERMINED AREA.
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.
APPENDIX STRUCTURE NO. 8140-006T
PHOTOGRAPHS STRUCTURE NO. 8140-006T
PHOTO #1 - LOOKING EAST TOWARD PARKING AREA
PHOTO #2 - NORTH SIDE
PHOTO #3 - GENERAL TOPSIDE VIEW LOOKING WEST
PHOTO #4 - GENERAL UNDERSIDE VIEW LOOKING WEST
PHOTO #5 - TYPICAL VIEW OF DECKING
PHOTO #6 - TYPICAL CONDITION OF TOP OF DECK SURFACE
PHOTO #7 - TYPICAL VIEW OF STIFFENING TRUSS; SOUTH TRUSS
SHOWN
PHOTO #8 - SWAY CABLE ANCHORAGE AT SOUTHWEST CORNER
PHOTO #9 - SUSPENSION CABLE ANCHORAGE AT SOUTHWEST
CORNER
PHOTO #10 - SUSPENSION CABLE AND SWAY CABLE ANCHORAGES AT
NORTHWEST CORNER
PHOTO #11 - MINOR CORROSION OF MAIN SUSPENSION CABLE AT
SOUTHWEST CORNER
PHOTO #12 - TOWER LEG ANCHORAGE AT NORTHWEST CORNER OF
WEST TOWER; NOTE CORROSION OF CONNECTION PLATES
PHOTO #13 - STIFFENING TRUSS CONNECTION PLATES AND
HARDWARE; NOTE CORROSION OF STEEL. NORTH TRUSS NEAR WEST
END SHOWN
PHOTO #14 - GENERAL VIEW OF WEST ABUTMENT
PHOTO #15 - UTILITY LINES ON NORTH SIDE
OF STIFFENING TRUSS; NOTE CORROSION
PHOTO #16 - SWAY CABLE CONNECTION TO
STIFFENING TRUSS; NOTE CORROSION OF
CABLE AND FITTINGS
PHOTO #17 - VERTICAL HANGER CONNECTION TO MAIN NORTH
SUSPENSION CABLE; NOTE CORROSION OF MAIN SUSPENSION
CABLE, FITTINGS AND VERTICAL HANGER
PHOTO #18 - MAIN NORTH SUSPENSION CABLE NEAR MIDSPAN; NOTE
CORROSION
PHOTO #19 - UNDERSIDE OF STRUCTURE; NOTE CORROSION OF
STEEL MEMBERS AND STAINING OF STRINGERS, FLOORBEAMS, AND
UNDERSIDE OF DECKING
PHOTO #20 - MINOR HAIRLINE CRACKING WITH RUST STAINING IN
CONCRETE FOOTING FOR NORTH SIDE OF EAST TOWER
PHOTO #21 - MAIN SUSPENSION CABLE ANCHORAGE AT EAST END OF
BRIDGE
PHOTO #22 - SWAY CABLE CONNECTION TO STIFFENING TRUSS; NOTE
CORROSION OF CABLE AND FITTINGS
PHOTO #23 - EAST APPROACH
PHOTO #24 - WEST APPROACH
PHOTO #25 - VIEW FROM BRIDGE LOOKING SOUTH
PHOTO #26 - VIEW FROM BRIDGE LOOKING NORTH
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