2017 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # CSAH

Transcription

1 2017 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # CSAH 5 over ROOT RIVER DISTRICT: District 6 COUNTY: Fillmore CITY/TOWNSHIP: FILLMORE STATE: Minnesota Date of Inspection: Equipment Used: 10/22/2016 Owner: County 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 PICTURES 12 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 to satisfactory condition with no defects of structural significance below water. The concrete surfaces of the piers exhibited light scaling around the waterline and some minor vertical cracks on the pier shafts. A moderate to heavy accumulation of 2 feet diameter and smaller timber debris was observed at the upstream nose and along the east face of Pier 1. A moderate accumulation of timber debris was observed at the upstream nose of Pier 2 and extended approximately 40 feet upstream. The footing was exposed at Pier 2 along the east face and at the upstream and downstream noses. Along the east face the maximum vertical exposure was 1.5 feet with undermining and five exposed steel H-piles. The exposed piles were in good condition with minimal deterioration. At Pier 1 the footing was exposed on the west face from the upstream nose to the downstream nose with a maximum vertical exposure of 6 inches and no undermining. The channel bottom configuration has experienced some notable changes (mostly degradation) since the last inspection, but there has been only a minor increase in the extent of undermining at Pier 2. INSPECTION FINDINGS 1. The channel bottom at upstream end of Pier 1 consisted of gravel and silt allowing up to 2 inches of probe rod penetration. 2. The channel bottom consisted of silty sand allowing up to 1 foot of probe rod penetration at the downstream end of both piers. 3. The channel bottom at the upstream end of Pier 2 consisted of soft silt allowing up to 1.5 feet of probe rod penetration. 4. A vertical hairline crack was observed at the midpoint of Pier 2 that extended from the top of the pier cap to 2 feet below the waterline. 5. A vertical hairline crack was observed at the midpoint of Pier 2 that extended from the top of the pier cap to the top of the footing. 6. Light scaling was observed along all pier faces from 1 foot above to 1 foot below the waterline with a maximum penetration of 1/16 inch. 7. Moderate to heavy accumulation of timber debris, with pieces 2 foot diameter and smaller, from upstream quarter-point along the east face of Pier 1 to the upstream nose and extending from the channel bottom to 3 feet above the waterline and 10 feet out from the pier face and nose. 8. Moderate accumulation of timber debris consisting of a 2 foot diameter tree trunk forked around the upstream nose of Pier 2 and extending approximately 40 feet upstream with associated 1 foot diameter and smaller branches surrounding the trunk. 9. The footing was exposed along the east face of Pier 2 with undermining and exposed steel H-piles observed from the midpoint of the downstream nose, up the east side and around the upstream southeast corner, and extending to the upstream southwest corner, with a maximum height of approximately 1.5 feet along most of the undermined area on the east side of the pier, and 4 to 5 feet of maximum horizontal penetration. The exposed steel H-piles (5 total) within the undermining cavity were sound without any notable deterioration (just spotty surface corrosion). 10. The footing was exposed along the west face of Pier 1 between the upstream and the downstream noses with maximum vertical exposure of 6 inches along the upstream quarter of the footing. No vertical exposure was observed from the midpoint to the downstream nose of the pier and no undermining of the footing was present. RECOMMENDATIONS (A) Remove timber debris accumulations at Piers 1 and 2. Removal of the timber debris will reduce excessive lateral loads on the pier, limit further debris accumulation, and reduce the likelihood of channel bottom degradation resulting from obstructed flow. Until the timber debris can be removed, monitor for any significant increase in debris accumulation and/or scour at the bridge. (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 19

4 UNDERWATER INSPECTION 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: ROOT RIVER CSAH 5 District 6 County: Fillmore Bridge Description: The superstructure consists of three spans of continuous multiple steel stringers supporting a reinforced concrete deck. The superstructure is supported by two reinforced concrete abutments and two reinforced concrete piers. Both the abutments and piers are supported by footings on steel H-piles. The piers are numbered 1 and 2 starting from the south 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 10/22/2016 Sunny, 60 F 3.0 feet 1 ft/sec 3. SUBSTRUCTURE INSPECTION DATA Substructure(s) Inspected: Piers 1 and 2. General Shape: The piers consist of a rectangular concrete shaft with rounded ends that supports a hammerhead pier cap and bears on a rectangular concrete footing founded on steel H-piles. Maximum Water Depth at Substructure(s) Inspected (feet): 9.3 feet 4. WATERLINE DATUM Water Level Reference: Waterline Elevation (feet): Description: The top of the pier cap on the west end of Pier feet The waterline was located approximately 10.4 feet below the 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: Code: Code: Code: 6 5 Page 4 of 19

5 Item 92B: Underwater Inspection: Item 113: Scour Critical Bridge: Code: Code: Y 48 10/2016 N 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 52 LF Reinforced Concrete Footing 62 LF Scour 1 EA 1 Page 5 of 19

6 UNDERWATER INSPECTION INSPECTION PROCEDURES The routine underwater inspection of Bridge 23501(CSAH 5 over Root River) was completed on October 22, The underwater inspection was conducted from the shore. 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. 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, the inspected substructure units are founded on rectangular concrete footings supported by steel H-piles and are designated as Piers 1 and 2 starting from the south. 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 19

7 Bridge ID: Minnesota Structure Inventory Report CSAH 5 over ROOT RIVER Date: 01/19/ 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 63 District 06 County Fillmore Route Sys 04 - CSAH Number 5 Functionally Obsolete City Sect., Twp., Range Main Span Type 4 - Steel Continuous Median Width On Bridge Main Span Design Main Span Detail Appr. Span Type Appr. Span Design Appr. Span Detail Culvert Type Barrel Length Cantilever ID MAIN: 3 Main Span Length Structure Length 01 - Beam Span Skew 35 LEFT Number of Spans APPR: 0 TOTAL: 92.8 ft. + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Pier Foundation (Material/Type) Historic Status Deck Width (Out-to-Out) 30.0 ft. Year Painted 1975 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) 7470 sq. ft. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 0.00 Curb Height 0.7 MI N OF JCT CSAH 8 Level of Service 1 - MAINLINE 4-103N - 12W Roadway Type Latitude ' '' Control Section (TH Only) Status Lt 1 - Concrete Cast-in-Place 1 - Monolithic Concrete 0.00 ft. 0 - None B R I D G E D A T A No flare 4 - Bolted 3 - FTG PILE 1 - CONC 3 - FTG PILE 5 - Not eligible + P A I N T + ft. Bridge Railing 0 - SUBSTANDARD Appr. Guardrail GR Termini Underwater 60 Pinned Asbly. Spec. Feat. Drainage Area (sq. mi.) ft. Navigation Control 6975 sq. ft. Traffic ft. 50B. Rt ft. Rt Painted Area Posted Load ft. N - No parallel structure GR Transition 1 - CONC Frac. Critical 0 - Not Required 0 - Not Required ft. Horizontal 1 - Object Markers 0.75 ft. Vertical Unsound Paint % 0 - None + B R I D G E 2-2-way traffic Longitude ' '' Reference Point Custodian Owner 02 - County Highway Agency 02 - County Highway Agency Roadway Name or Description Township FILLMORE CSAH 5 Desc. Loc. BMU Agreement Year Built 1961 MN Year Reconstructed FHWA Year Reconstructed MN Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key Detour Length 24.0 mi. Lanes Route On Structure On - Off System 1 - ON Roadway Width ft. Legislative District 27B Vertical Clearance ft. Potential ABC 2 - N/A Max. Vert. Clear. ft. Service On 1 - Highway Appr. Surface Width Service Under 3 - COUNTY 12/1/ 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 + W A T E R W A Y + Waterway Opening (sf.) 2450 Pier Protection Posting VEH: Rating Date 03/31/2014 N - NOT REQUIRED N - NOT REQUIRED N - NOT REQUIRED D E P T H I N S P. + Y/N Freq Date 10/22/ No nav. control on Rail Type Lt 42 Rt 42 A N - N/A B N - N/A C N - N/A sq. ft. ADTT 07 - Rural - Major Collector 32.0 ft. Nav. Clr. (ft.) Nav. Vert. Lift Bridge Clear. (ft.) Vert. 0.0 Horiz. Primer Type 1 - Lead - non 3309 MN Scour Code N - STBL - LIM Year 1995 Finish Type F - - Phenolic Resin Alum SCOUR + C A P A C I T Y R A T I N G S + S I G N S + ft. ft. ft. ft. Structurally Deficient Sufficiency Rating 90.6 Routine Inspection Date 04/03/2015 Routine Inspection Frequency 24 Inspector Name + N B I Design Load 4 - H 20 Operating Rating Stromberg, Dan A - Open C O N D I T I O N Deck 5 Unsound Superstructure 6 Deck % Underclearances Waterway Adequacy 8 ft. ft. Approach Alignment 8 ft. 0 D I M E N S I O N S + NB-EB % SB-WB Substructure Channel 5 Culvert + N B I Structure Evaluation 6 Deck Geometry HS TRUCK Inventory Rating 2 - HS TRUCK 18.4 N N N SEMI: Overweight Permit Codes 6 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 19

8 01/27/2017 MINNESOTA BRIDGE INSPECTION REPORT BRIDGE CSAH 5 OVER ROOT RIVER County: City: Township: Fillmore Location: 0.7 MI N OF JCT CSAH 8 Length: Route: 04 - CSAH 5 Ref. Pt.: Deck Width: ft ft FILLMORE Control Section: Rdwy. Area/ Pct. Unsnd: 6975 sq. ft. / % Section: 4 Township: 103N Range: 12W Maint. Area: Paint Area/ Pct. Unsnd: sq. ft. / % Span Type: 4 - Steel Continuous 2 - Local Agency Bridge Nbr.: Culvert: N/A List: Stringer/Multi-beam or Girder Postings: NBI Deck: 5 Super: 6 Sub: 6 Chan: 5 Culv: N Open, Posted, Closed: A - Open MN Scour Code: N - STBL - LIM SCOUR Appraisal Ratings - Approach: 8 Waterway: 8 Unofficial Structurally Deficient N Required Bridge Signs - Load Posting: 0 - Not Required Horizntal: 1 - Object Markers Traffic: Vertical: 0 - Not Required N - Not Applicable Unofficial Functionally Obsolete Unofficial Sufficiency Rating N 90.6 ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Deck 01/19/ SF Underwater 11/15/ SF Notes: [2005] - there is moderate cracking throughout the soffit. [2009] - there is moderate cracking (>25%) [2011] - no change approx. 27 cracks with efflorescence. [2013] - no change 2009 & [2015] - no change from 2005/2011 notes Wearing Surfaces Underwater 01/19/ SF /15/ SF Notes: Top of Concrete Deck with Uncoated Rebar Notes: [2005] - there are numerous sealable cracks throughout the deck. there is light scaling throughout the deck. there are also cracks throughout the soffit. [2009] - chain drag indicated approx. 16 SF of unsound area [2011] - chain drag revealed approx. 38 sq. ft of unsound deck. approx. >10% of deck has moderate size cracks which need sealant. minor wear throughout. [2013] - chain drag revealed 69 sf of delamination. There is moderate wear and scaling throughout. [2015] - moderate wear and scaling throughout Steel Open Girder/Beam 01/19/ LF Underwater 11/15/ LF Notes: [2005] - there is flaking rust on the outside of the facias beneath each deck drain. [2009] - there is flaking rust on the bottom flange of the girders beneath the deck drains. [2011] - All beams have moderate surface corrosion with flaking all abuts, approx. 1/3 of length of both beam 1 & 4 have suface upper & lower flange and at the deck drain locations. [2013] - no change from 2011 inspection [2015] - no change from 2011 notes Steel Protective Coating Underwater 01/19/ SF /15/2016 Notes: [2016] Migrator assumed quantity of 999 SF and estimated the condition states. 999 SF Reinforced Concrete Pier Wall 01/19/ LF Underwater Notes: [2003] - there are minor cracks throughout. [2011] - no change [2013] - viewed from bank due too high water. No problems noted. [2015] - viewed from bank due to water depth. no problems noted. 11/15/ LF Page 8 of 19

9 BRIDGE CSAH 5 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Reinforced Concrete Abutment 01/19/ LF Underwater 11/15/ LF Notes: [2016] Migrator added 40 LF to abutment quantity to account for wingwalls (CS1:0 CS2:40 CS3:0 CS4:0). [2003] - there are minor cracks throughout. [2011] - no change [2013] - no notes. [2015] - no change from 2003 notes. Wingwall notes: [2005] - all wings have minor deterioration. [2011] - no change [2013] - no change [2015] - no change from 2005 notes. Reinforced Concrete Pier Cap 01/19/ LF Underwater Notes: [2003] - there are minor cracks throughout. [2011] - no change [2013] - no notes. [2015] - viewed from bank due to water depth. no problems noted. 11/15/ LF Pourable Joint Seal 01/19/ LF Underwater Notes: [2003] -most of the sealant is missing. there is no sign of seepage. [2011] - no change [2013] - majority of sealant is missing - no sign of leakage under north bridge. [2015] - no change from 2013 notes. 11/15/ LF Assembly Joint without Seal 01/19/ LF Underwater 11/15/ LF Notes: [2005] - the plates have moderate corrosion on the bottom. the joints are still functioning. [2011] - both assembly joints have moderate surface corrosion with flaking rust. [2013] - no change [2015] - both assembly joints have moderate surface corrosion and flaking rust. the south joint is approaching severe deterioration. Movable Bearing 01/19/ EA Underwater 11/15/ EA Notes: [2003] - all bearings at the abutments are corroded. [2011] - surface corrosion with flaking rust is present throughout all bearing at abuts. Bearings appear to be functioning as intended. [2013] - no change from [2015] - no change from 2011 notes. Fixed Bearing 01/19/ EA Underwater Notes: [2013] - no notes. [2015] - no notes. 11/15/ EA Metal Bridge Railing 01/19/ LF Underwater 11/15/ LF Notes: [2003] - there is minor corrosion throughout both rails. [2007] - There is surface corrosion prevalent throughout both rails. [2009] - minor corrosion at the connectors [2011] - no change 2007 & [2013] - no change from 2007 & 2009 inspection. [2015] - no change from 2007 & 2009 notes Steel Protective Coating Underwater 01/19/ SF /15/2016 Notes: [2016] Migrator assumed CS1 and a quantity of 999 SF. 999 SF Page 9 of 19

10 BRIDGE CSAH 5 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Critical Deficiencies or Safety Hazards 01/19/ EA Underwater Notes: [2013] - no findings [2015] - no findings. 11/15/ EA Concrete Decks - Cracking & Sealing 01/19/ LF Underwater 11/15/ LF Notes: [2005] - there is moderate density cracking on the deck that should be sealed. [2007] - There are unsealed cracks of moderate size and density located throughout the deck. These cracks should be sealed. [2011] - no change approx. 4' spacing. [2013] - unsealed cracks throughout of moderate size and density - transverse cracks at approx. 4' spacing. [2015] - no change from 2013 notes. Bituminous Approach Roadway 01/19/ EA Underwater 11/15/ EA Notes: [2005] - both approaches are cracked and settled. [2007] - The South approach has several potholes and is spalled along the bridge. [2009] - both approaches are cracked and have potholes. [2011] - no change [2013] - moderate size potholes at both approaches and away from bridge approx. 2'. [2015] - potholes patched. there is minor settlement an cracking. Concrete Shear Cracking 01/19/ EA Underwater 11/15/ EA Notes: Use this element to monitor the presence of shear cracking on concrete elements. Pay particular attention to the concrete pier caps. Other Bridge Signing 01/19/ EA Underwater Notes: Signs Required: Horizontal Clearance [2013] - good condition. [2015] - good condition. 11/15/ EA Slopes & Slope Protection 01/19/ EA Underwater Notes: Use this element to rate the condition of slopes and slope protection. 11/15/ EA Deck & Approach Drainage 01/19/ EA Underwater Notes: Use this element to rate the condition, function, and adequacy of the drainage system. 11/15/ EA Sidewalk, Curb, & Median 01/19/ EA Underwater Notes: [2003] - both curbs have minor deterioration. [2011] - no change 2003 [2013] - minor deterioration and spalls throughout both curbs. [2015] - no change from 2013 notes. 11/15/ EA Protected Species 01/19/ EA Underwater Notes: Use this element to track the presence of protected species living on this structure. 11/15/ EA General Notes: 58. Deck NBI: [2005] - inspected by TM, DS - There is debris lodged at the piers. This would be a good candidate for gland replacement. [2007] - inspected by DS - There is possible scour occurring around the North pier. There is minor upstream bank erosion throughout the channel and at the NW corner of the bridge. [2009] - inspected by DS, JT [2011] - possible minor scour around both piers. debris lodge at both piers, minor upstream and downstream bank erosion. [2013] - no notes. [2015] - inspected by JT - no notes. [2016] - see element 12 36A. Brdg Railings NBI: Page 10 of 19

11 BRIDGE CSAH 5 OVER ROOT RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 36B. Transitions NBI: 36C. Appr Guardrail NBI: 36D. Appr Guardrail Terminal NBI: 59. Superstructure NBI: 60. Substructure NBI: 61. Channel NBI: See general notes 62. Culvert NBI: 71. Waterway Adeq NBI: 72. Appr Roadway Alignment NBI: Inspector's Signature Reviewer's Signature Page 11 of 19

12 Pictures Photo 1 - Overall View of Downstream Fascia, Looking Southwest Photo 2 - Overall View of Upstream Fascia, Looking Northeast Page 12 of 19

13 Pictures Photo 3 - View of Pier 1, Looking Northwest Photo 4 - View of Pier 1, Looking North Page 13 of 19

14 Pictures Photo 5 - View of Pier 1, Looking Northeast Photo 6 - View of Pier 2, Looking Northwest Page 14 of 19

15 Pictures Photo 7 - View of Pier 2, Looking Northeast Photo 8 - View of Footing Exposure at Downstream Nose of Pier 1, Looking Northeast Page 15 of 19

16 Pictures Photo 9 - View of Vertical Footing Exposure at Pier 1, Looking Southeast Photo 10 - View of Undermining at Pier 2, Looking North Page 16 of 19

17 Pictures Photo 11 - View of Undermining at Pier 2, Looking West Photo 12 - View of Undermining and Exposed Steel H-pile at Pier 2, Looking Northwest Page 17 of 19

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