COLLEGE DR (126) over MISSISSIPPI RIVER

Transcription

1 2016 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # COLLEGE DR (126) over MISSISSIPPI RIVER DISTRICT: District 3 COUNTY: Crow Wing CITY/TOWNSHIP: Brainerd STATE: Minnesota Date of Inspection: Equipment Used: 06/08/2016 Owner: City or Municipal Highway Agency Inspected By: Stromberg, Dan Report Written By: Dan Stromberg Report Reviewed By: Final Report Date:

2 TABLE OF CONTENTS PAGE NUMBER UNDERWATER SUMMARY 3 UNDERWATER INSPECTION 4 UNDERWATER INSPECTION PROCEDURES 6 STRUCTURE INVENTORY 7 ELEMENTS 8 PHOTOGRAPHS 13 BRIDGE UNDERWATER INSPECTION DRAWINGS

3 UNDERWATER INSPECTION REPORT SUMMARY The substructure units inspected at Bridge No , Piers 1 and 2, were found to be in good condition with no defects of structural significance observed. The concrete shafts and exposed footing were typically smooth and sound with light scaling present above the waterline. The channel bottom consisted of sand and gravel around the substructure units and a moderate accumulation of timber debris was observed at the upstream noses of both piers and along the east and west faces of Pier 2. Footing exposure was observed at Pier 1 with up to 1 foot of vertical face exposure. INSPECTION FINDINGS (A) The channel bottom material consisted of sand and gravel with random cobbles throughout. Overall, probe rod penetration was negligible. (B) Scaling was observed around the entire pier shaft of both piers typically extending from the waterline up 1 foot with a maximum penetration of 1/4 inch. The scaling was heaviest at the upstream nose where it extended up to 7 feet above the waterline. (C) Below the waterline the concrete of the pier shafts and exposed footing were typically smooth and sound with random minor areas of poor consolidation with penetration up to 1/4 inch. (D) Footing exposure was observed at the upstream nose, along the upstream quarter of the pier on west side, and along the entire east side of Pier 1 with up to 1 foot of vertical face exposure. (E) A moderate accumulation of timber debris, consisting of logs and branches up to 12 inches in diameter, was observed from the channel bottom up 2 feet around the upstream noses of Piers 1 and 2, and along the east and west faces of Pier 2. RECOMMENDATIONS (A) Monitor timber debris accumulations around Piers 1 and 2 during future inspections, and if found to be progressing, removal may become warranted, to eliminate excessive lateral loads on piers and the potential for scour. (B) Reinspect the submerged substructure units at the normal maximum recommended (NBIS) interval of sixty (60) months. Contractor: Contractor Job Number: Collins Engineers, Inc Page 3 of 17

4 UNDERWATER INSPECTION 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: County: MISSISSIPPI RIVER COLLEGE DR (126) District Crow Wing Bridge Description: The bridge superstructure consists of three spans of prestressed concrete beams. The superstructure is supported by two reinforced concrete abutments and two reinforced concrete piers. The abutments and piers are founded on steel H-piles. The piers are numbered 1 and 2 starting from the west end of the bridge. 2. INSPECTION DATA Professional Engineer/Team Leader: Inspection Diver: Date of Underwater Inspection: Weather Conditions: Underwater Visibility (feet): Waterway Velocity (ft/sec): Daniel G. Stromberg Daniel G. Stromberg 06/08/2016 Cloudy, 50'F 4.0 Feet 2.0 ft/sec 3. SUBSTRUCTURE INSPECTION DATA Substructure(s) Inspected: Piers 1 and 2 General Shape: Piers consist of oblong rectangular shafts with rounded ends, supported by rectangular footings founded on steel H-piles. Maximum Water Depth at Substructure(s) Inspected (feet): 12.5 feet 4. WATERLINE DATUM Water Level Reference: Waterline Elevation (feet): Description: Top of the pier cap at the north end of Pier The waterline was approximately 17.5 feet below reference. 5. NBIS CODING INFORMATION (Minnesota specific codes are used for 92B and 113) Item 60: Substructure: Item 61: Channel and Channel Protection: Item 62: Culvert: Item 92B: Underwater Inspection: Code: Code: Code: Code: 7 6 Y 48 6/2016 Page 4 of 17

5 Item 113: Scour Critical Bridge: Code: I Bridge is scour critical because abutment or pier foundation is rated as unstable due to observed scour at bridge site. Yes X No (Mark your selection with an X) 6. STRUCTURAL ELEMENT CONDITION RATING Conditions ELEM # Element Description Quantity Unit CS1 CS2 CS3 CS4 210 Reinforced Concrete Pier Wall 180 LF Reinforced Concrete Footing 1 EA Scour 1 EA 1 Page 5 of 17

6 UNDERWATER INSPECTION INSPECTION PROCEDURES The routine underwater inspection of Bridge (College Drive over Mississippi River) was completed on June 8, The underwater inspection was conducted from a 14 ft boat. The inspection was conducted by a team consisting of a Professional Engineer Diver with a valid MnDOT Team Leader certification, a backup diver and dive tender. The inspection utilized commercial dive equipment and techniques (SSA and/or SCUBA) in accordance with OSHA regulations. Channel bottom profiles were taken along the upstream and downstream faces of the bridge and around the periphery of substructure units to determine the presence, location, and area of scour. The bridge elements inspected consisted of two reinforced concrete piers. According to design drawings, Piers 1 and 2 are founded on steel H-piles. Inspection procedures followed FHWA guidance and the MnDOT Bridge and Structure Inspection Program Manual with channel bottom probing to search for foundations. The maximum routine underwater inspection frequency is recommended to remain at 60 months based on those findings and risk factors. Also, inspection procedures should continue to follow the above approach and standard guidance with 100% Level I and 10% Level II intensity efforts. Page 6 of 17

7 Bridge ID: Minnesota Structure Inventory Report COLLEGE DR (126) over MISSISSIPPI RIVER Date: 08/04/ G E N E R A L + + R O A D W A Y + + I N S P E C T I O N + Agency Br. No. Crew Bridge Match ID (TIS) 0 Userkey 135 District 03 County Crow Wing Route Sys 05 - MSAS Number 126 Functionally Obsolete City Sect., Twp., Range Latitude ' '' Control Section (TH Only) Status Custodian Owner Main Span Type 5 - Prestress or Precast Median Width On Bridge Main Span Design Main Span Detail Appr. Span Type Appr. Span Design Appr. Span Detail Skew 0 Culvert Type Barrel Length Cantilever ID MAIN: 3 Main Span Length Structure Length 01 - Beam Span Number of Spans APPR: 0 TOTAL: 83.6 ft. Deck Width (Out-to-Out) 66.0 ft. Deck Material Wear Surf Type Wear Surf Install Year Wear Course/Fill Depth Deck Membrane Deck Rebars Deck Rebars Install Year Structure Area (Out-to-Out) sq. ft. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 6.00 Curb Height Brainerd 0.6 MI W OF JCT TH 371 Level of Service 1 - MAINLINE N - 31W Roadway Type Lt 1 - Concrete Cast-in-Place 1 - Monolithic Concrete 0.00 ft. 0 - None + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Pier Foundation (Material/Type) Historic Status 3 - FTG PILE 1 - CONC 3 - FTG PILE Underwater Y 60 Pinned Asbly. Spec. Feat ft. Navigation Control Year Painted sq. ft. Traffic ft. 50B. Rt ft. Rt Painted Area Primer Type Posted Load B R I D G E D A T A No flare 5 - Not eligible + P A I N T + ft. Bridge Railing 1 - MEETS STANDARDS ft. N - No parallel structure GR Transition Appr. Guardrail GR Termini 1 - CONC Frac. Critical 0 - Not Required 0 - Not Required ft. Horizontal 0 - Not Required 0.83 ft. Vertical Unsound Paint % Finish Type 0 - None + B R I D G E 2-2-way traffic Longitude ' '' Reference Point City or Municipal Highway 04 - City or Municipal Highway Roadway Name or Description Township College Dr (MSAS 126) Desc. Loc. BMU Agreement Year Built 1974 MN Year Reconstructed FHWA Year Reconstructed MN Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key Detour Length 2.0 mi. Lanes Route On Structure On - Off System 1 - ON Roadway Width ft. Legislative District 12A Vertical Clearance ft. Potential ABC 2 - N/A Max. Vert. Clear. ft. Service On 5 - Highway-pedestrian Appr. Surface Width Service Under 1 - CENTRAL 1/1/ S T R U C T U R E + HCADT Functional Class If Divided + R D W Y Horizontal Clear. Lateral Clearance ON 2 UNDER ADT 5 - Waterway Bridge Roadway Width YEAR 2008 N - Not Applicable + I N N + W A T E R W A Y + Drainage Area (sq. mi.) Waterway Opening (sf.) 4220 Pier Protection Posting VEH: 1 - MEETS STANDARDS 1 - MEETS STANDARDS 1 - MEETS STANDARDS D E P T H I N S P. + Y/N Freq Date N Rating Date 9/1/ /08/ No nav. control on Rail Type Lt 17 Rt 17 A N - N/A B N - N/A C N - N/A sq. ft. ADTT 17 - Urban - Collector 44.0 ft. S I G N S + ft. ft. ft. ft. Structurally Deficient Sufficiency Rating 98.8 Routine Inspection Date 10/28/2014 Routine Inspection Frequency 24 Inspector Name + N B I Nav. Clr. (ft.) Nav. Vert. Lift Bridge Clear. (ft.) MN Scour Code Design Load 5 - HS 20 Operating Rating Stromberg, Dan A - Open C O N D I T I O N Deck 7 Unsound Superstructure 8 Deck % Underclearances Waterway Adequacy ft. ft. Approach Alignment 9 ft. 0 D I M E N S I O N S + NB-EB % SB-WB Substructure Channel 6 Culvert + N B I Structure Evaluation 7 Deck Geometry 9 Vert. 0.0 Horiz. I - LOW RISK Year C A P A C I T Y R A T I N G S H TRUCK Inventory Rating 1 - H TRUCK 21.9 N N N SEMI: Overweight Permit Codes 7 N R A T I N G S + A P P R A I S A L R A T I N G S + + S A F E T Y F E A T U R E S + DBL: Page 7 of 17

8 09/16/2016 Inspector: CO Bridge MINNESOTA BRIDGE INSPECTION REPORT BRIDGE COLLEGE DR (126) OVER MISSISSIPPI RIVER County: City: Township: Crow Wing Location: 0.6 MI W OF JCT TH 371 Brainerd Route: 05 - MSAS 126 Ref. Pt.: Control Section: Section: 25 Township: 045N Range: 31W Maint. Area: Span Type: 5 - Prestressed Concrete 2 - Local Agency Bridge Nbr.: List: Stringer/Multi-beam or Girder NBI Deck: 7 Super: 8 Sub: 7 Chan: 6 Culv: N Open, Posted, Closed: A - Open MN Scour Code: I - LOW RISK Appraisal Ratings - Approach: 9 Waterway: 9 Required Bridge Signs - Load Posting: 0 - Not Required Traffic: 0 - Not Required Horizntal: 0 - Not Required Vertical: N - Not Applicable Length: ft. Deck Width: 66.0 ft. Rdwy. Area/ Pct. Unsnd: sq. ft. / % Paint Area/ Pct. Unsnd: sq. ft. / % Culvert: N/A Postings: Unofficial Structurally Deficient N Unofficial Functionally Obsolete N Unofficial Sufficiency Rating 98.8 ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Deck 06/08/ SF Underwater Notes: 2006 No change SF Wearing Surfaces Underwater 06/08/ SF SF Notes: Top of Concrete Deck with Uncoated Rebar Notes: 2006 Light scale (<1/4 inch) on about 5% of surface. Noted diagonal crack in deck at NW corner. See photo Renovations to Bridge in Sidewalk on south side eliminated & deck repaired. Sidewalk north side widened, onto existing deck. Deck slab widened at Abut. corners & piers to provide base for railing pilasters. 109 Prestressed Concrete Open Underwater Girder/Beam Notes: 2006 No change. 06/08/ LF LF Reinforced Concrete Column 06/08/ EA Underwater Notes: 2006 No change. 2 EA Reinforced Concrete Abutment 06/08/ LF Underwater 167 LF Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:40 CS2:0 CS3:0 CS4:0) Concrete spalling on E abutment backwall at beam ends. 1/2 sq ft spall at S end of W abutment with tee growing in joint. See photo. [2008] Abutment to backwall alignment indicates movement consistent with approach settlement. See photos. Measurement at brgs show movement as follows: NE corner 2½ inches, SE corner 1 3/4 inches, NW corner 1 inch, and SW corner ½ inch. Air temp 75. Two spall at NE corner, E abut at N fascia beam end. [2010] Tree still growing in W abut/diaphragm joint W. abut. graffiti. Tree still growing in W. abut diaphragm joint. Wingwall notes: 2006 No change. [2008] Cork at abut to wingwall joints deteriorated and joint is leaking. Page 8 of 17

9 BRIDGE COLLEGE DR (126) OVER MISSISSIPPI RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Pier Cap 06/08/ LF Underwater Notes: 2006 No change. 127 LF Strip Seal Expansion Joint 06/08/ LF Underwater Notes: 2006 No change Clean out glands Clean out glands. 132 LF Pourable Joint Seal 06/08/ LF Underwater Notes: 2006 No change Split at E. End. 264 LF Movable Bearing 06/08/ EA Underwater Notes: 2006 No change. 28 EA Fixed Bearing 06/08/ EA Underwater Notes: 2006 No change. 8 EA Reinforced Concrete Approach Slab 06/08/ SF Underwater 1760 SF Notes: [2016] Migrator assumed an approach slab length of 20FT and used the inventory quantity of 44FT for the width. (100) W appr panel settled approx 1/4" more since last insp. No apparent change in cracks or water retention as described in last report. [1999] Add'l settling of < 1/4" has occurred. Appr slab abutting SW corner of deck appears to be settling a little more. No sign of material loss. Suspect loss compaction. [2001] Appr slab is settling along entire W abut. Slab should be replaced/mudjacked if possible. [2002] No more settlement since '01; working with Mn/DOT to evaluate corrective actions. [2004] W appr panel overlayed with bit in '03. Will be replaced in '08 street reconstruction. [2010} W abut moved 1/2" +/- toward river E appr panel. Moderate longit cracks in EB & WB lanes. [2008] E appr panel settled approx 3/4". curb is leaking undermining walk. [2010] E abut moved 2"-3" toward river. top of abut beam most likely failing. Front face fill eroded to 3 ft below top of abut ends. Loss of passive pressure probably contributing to abut movement Renovation to Bridge in New concrete approach slabs installed on both ends. Random transverse cracking in approach blocks. Metal Bridge Railing 06/08/ LF Underwater 502 LF Notes: [2016] Migrator assumed concrete/metal combination type rail Noted typical vertical hairline cracking at mid panel or 1/3 points. 1/2 sq ft spall on N rail at Pier Renovations to Bridge in New combination railings were installed. Concrete railings (Type P-1 north side) & (Type P-4 south side), w/ornamental metal railing top portion(type special 1). Concrete Pilasters (posts) Abut. corns. & over piers also part of the combination railings Steel Protective Coating Underwater 06/08/ SF Notes: [2016] Migrator assumed CS1 and a quantity of 999 SF. 999 SF Page 9 of 17

10 BRIDGE COLLEGE DR (126) OVER MISSISSIPPI RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Bridge Railing 06/08/ LF Underwater 502 LF Notes: [2016] Migrator assumed concrete/metal combination type rail Noted typical vertical hairline cracking at mid panel or 1/3 points. 1/2 sq ft spall on N rail at Pier Renovations to Bridge in New combination railings were installed. Concrete railings (Type P-1 north side) & (Type P-4 south side), w/ornamental metal railing top portion(type special 1). Concrete Pilasters (posts) Abut. corns. & over piers also part of the combination railings. Critical Deficiencies or Safety Hazards 06/08/ EA Underwater Notes: NO CRITICAL FINDINGS OBSERVED DURING THE LAST INSPECTION No change No change. 1 EA Concrete Decks - Cracking & Sealing 06/08/ LF Underwater Notes: ft diagonal crack at NW corner. 0 LF Concrete Shear Cracking 06/08/ EA Underwater 1 EA Notes: Use this element to monitor the presence of shear cracking on concrete elements. Pay particular attention to the concrete pier caps and prestressed concrete beams. Scour 06/08/ EA Underwater Notes: 2006 No problems noted. Riprap at river bank. 1 EA Slopes & Slope Protection 06/08/ EA Underwater 1 EA Notes: (185) Deck drain has been plugged, no further erosion [2002] Plug still in place, no further erosion RIPRAP UNDER EAST ABUTMENT NEEDS REPAIR - NEED A MORE PERMENENT SOLUTION. (180) Riprap continues to need repair Riprap repair began this year, needs additional work [2001] Riprap was repaired but not holding due to vandalism. When repaired again, should be grouted in place. [2002] Additional repairs not made since last inspection; will schedule for Soil slopes showing signs of erosion. Riprap at river bank at W abut. [2010] Front face fill eroded up to 3 ft below top of E abut front face Renovations to Bridge in Riprap on slopes repaired. Modular retailing wall, riprap & paved trail added to east slope Graffiti on E. retaining wall. Erosion below sidewalk at N.E. end of retaining wall. Guardrail 06/08/ EA Underwater 1 EA Notes: (182) Erosion around guardrail has been repaired and appears to be holding up well Erosion still holding up [2002] No more erosion around guardrail Noted minor damage at NE twist-down. [2008] NW corner has minor impact damage with off-set blocks misaligned. NE corner has minor damage. [2010] No change. Deck & Approach Drainage 06/08/ EA Underwater 1 EA Notes: 2006 Deck drains are plugged at bridge ends and open in the center portion Renovations to Bridge in North drains are gone (covered by new sidewalk). South drains have deen reconstructed & functioning as intended. Page 10 of 17

11 BRIDGE COLLEGE DR (126) OVER MISSISSIPPI RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Sidewalk, Curb, & Median 06/08/ EA Underwater 1 EA Notes: [2002] Sidewalk on north side, east abutment approach has settled over utility conduits; is hazardous and needs to be repaired SIDEWALK ON NORTH SIDE OF COLLEGE DR. EAST SIDE OF BRIDGE NEEDS REPAIR NE app walk broken and settled up to 2 1/2 inches at bridge. The two panels at bridge need repair/replacement. NW walk settling at bridge. [2008] NE approach walk is undermined and has settled about 3 inches and is broken up. Joint at bridge is leaking. [2010] NE approach walk still undermined. SW approach at end deck in turf Renovations to Bridge in Sidewalk on south side of Br. was removed. Sidewalk on north side of Br. was widened 6'6". Crack at end of sidewalk at West end Spalling along traffic edge of Sidewalk. Miscellaneous Items 06/08/ EA Underwater 1 EA Notes: 2006 Open access panel on light on W end of N rail. Utilities supported under bridge at N and S bays. [2010] Open access panel on light on W end of N rail Renovations to Bridge in New 2" utility conduit was installed in base of new concrete railings both sides. Protected Species 06/08/ EA Underwater 1 EA Notes: [2016] Migrator determined the presence of swallows on this structure based on data in the inventory or comments in the general/miscellaneous notes. General Notes: 58. Deck NBI: 36A. Brdg Railings NBI: 36B. Transitions NBI: 36C. Appr Guardrail NBI: 36D. Appr Guardrail Terminal NBI: 59. Superstructure NBI: 60. Substructure NBI: 61. Channel NBI: 62. Culvert NBI: 71. Waterway Adeq NBI: 72. Appr Roadway Alignment NBI: [2001] [2002] [2006] and [2008] Noted remains of swallow nests under bridge. Heavy graffiti present at both abutments. [2008] 19 photos taken Renovations to Bridge in Project No. SP Screen under utilities between beams damaged at each end of bridge No changes Renovations to Bridge in Involved deck repairs south side of bridge New railings Condition rating reduced to 7 due to minor defects observed below water. Defects include scaling and poor concrete consolidation at Piers 1 and 2, as well as footing exposure at Pier Renovations to Bridge in Involved riprap repair on slopes. Modular retaining wall added to east slope Condition rating reduced to 6 due to moderate accumulations of timber debris observed at the upstream nose of both piers. Inventory Notes: Page 11 of 17

12 BRIDGE COLLEGE DR (126) OVER MISSISSIPPI RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Dan Stromberg Inspector's Signature Reviewer's Signature Page 12 of 17

13 Pictures Photo 1 - Overall View of Structure, Looking North. Photo 2 - Overall View of Structure, Looking Southeast. Page 13 of 17

14 Pictures Photo 3 - Overall View of Pier 1, Looking Northwest. Photo 4 - Overall View of Pier 1, Looking Southwest. Page 14 of 17

15 Pictures Photo 5 - Overall View of Pier 2, Looking Northwest. Photo 6 - Overall View of Pier 2, Looking Southeast. Page 15 of 17

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