2016 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # CR

Transcription

1 2016 UNDERWATER BRIDGE INSPECTION REPORT BRIDGE # CR 597 over RICE RIVER DISTRICT: District 1 COUNTY: St. Louis CITY/TOWNSHIP: ANGORA STATE: Minnesota Date of Inspection: Equipment Used: 06/21/2016 Owner: County Highway Agency Inspected By: Janulis, Lukas Report Written By: Lukas Janulis 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 11 BRIDGE UNDERWATER INSPECTION DRAWINGS

3 UNDERWATER INSPECTION REPORT SUMMARY The substructure units inspected at Bridge No , the North Abutment and Bent 1, were found to be in fair to poor condition, with only minor defects of structural significance. The timber piles were typically sound with random splitting extending from the pile cap down up to 4 feet. Pile A of Bent 1 had a 1 inch wide by 8 inch deep split extending from the pile cap down 2.5 feet. The timber around the split was unsound and a hollow core was visible through the split with an estimated 15 percent loss of pile section. The overall condition of the structure has not significantly changed since the previous underwater inspection. INSPECTION FINDINGS (A) The channel bottom material typically consisted of gravel and sandy silt with a maximum probe rod penetration of 6 inches. (B) The timber piles were typically heavily weathered with checking and splitting up to 1/4 inch wide. The outer 2 inches of the upper 4 feet of the timber pile shells were typically unsound. (C) Pile A of Bent 1 had a 1 inch split extending from the pile cap down 2.5 feet with up to 8 inches of penetration. The pile was unsound along the length of the split. A hollow core was visible though the crack, with an estimated 15 percent loss of pile section. (D) Pile C of Bent 1 had a 1/2 inch split extending from the pile cap to 1.4 feet below the waterline with up to 4 inches of penetration. (E) The south cross-brace at Bent 1 exhibited heavy decay on the upstream end with up to 40 percent loss of section. (F) Backwall timbers were typically sound and tight with no notable gaps, deterioration, or loss of backfill. RECOMMENDATIONS (A) Repair Piles A and C of Bent 1 by splicing/posting in a new upper 5 feet of the member or by another method such as a structural jacket. (B) Reinspect the submerged substructure at the normal maximum recommended (NBIS) interval of sixty (60) months. Contractor: Contractor Job Number: Collins Engineers, Inc Page 3 of 15

4 UNDERWATER INSPECTION 1. BRIDGE DATA Bridge #: Feature Intersected: Facility Carried: District: RICE RIVER CR 597 District 1 County: St. Louis Bridge Description: The superstructure consists of a timber deck supported by steel I-beams. The superstructure is supported by two abutments consisting of five 12-inch-diameter timber piles and a pile bent consisting of five 12-inch-diameter timber piles. 2. INSPECTION DATA Professional Engineer/Team Leader: Inspection Diver: Date of Underwater Inspection: Weather Conditions: Underwater Visibility (feet): Waterway Velocity (ft/sec): Lukas Janulis Lukas Janulis 06/21/2016 Sunny, 70 F 1 foot Negligible 3. SUBSTRUCTURE INSPECTION DATA Substructure(s) Inspected: The North Abutment and Bent 1. General Shape: The North Abutment consists of five timber 12-inch-diameter piles with a 12 inch by 12 inch timber pile cap. The backwall and wingwalls were comprised of 3 inch by 12 inch timber boards. Bent 1 consisted of five timber 12-inch-diameter piles with a 12 inch by 12 inch timber pile cap and two 3 inch by 12 inch diagonal cross-brace boards. Maximum Water Depth at Substructure(s) Inspected (feet): 5.2 feet 4. WATERLINE DATUM Water Level Reference: Waterline Elevation (feet): Description: Top of the pile cap at the downstream end of Bent feet The waterline was approximately 3.2 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: 4 5 Page 4 of 15

5 Item 92B: Underwater Inspection: Item 113: Scour Critical Bridge: Code: Code: Y 48 06/16 K 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 216 Timber Abutment 87 LF Timber Piling 23 EA Scour 1 EA 1 Page 5 of 15

6 UNDERWATER INSPECTION INSPECTION PROCEDURES The routine underwater inspection of Bridge (CR 597 over Rice River) was completed on June 21, The underwater inspection was conducted from 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 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 a timber abutment and a timber bent. According to the bridge inventory, Bent 1 and the North Abutment are founded on timber 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 15

7 Bridge ID: Minnesota Structure Inventory Report CR 597 over RICE RIVER Date: 12/14/ 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. 355 Crew Bridge Match ID (TIS) 0 Userkey 109 District 01 County St. Louis Route Sys 07 - CNTY Number 597 Functionally Obsolete City Sect., Twp., Range Main Span Type 3 - Steel 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: 2 Main Span Length Structure Length 01 - Beam Span Number of Spans APPR: 0 TOTAL: 23.0 Deck Width (Out-to-Out) 19.5 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) 956 sq. Roadway Area (Curb-to-Curb) Sidewalk Width 50A. Lt 0.00 Curb Height 0.3 MI N OF JCT CR936 Level of Service 1 - MAINLINE N - 18W Roadway Type Latitude ' 6.04 '' Control Section (TH Only) Status Lt 8 - Wood or Timber 6 - Bituminous None N - Not Applicable (no deck) + M I S C. Structure Flared Parallel Structure Field Conn. ID Abutment Foundation (Material/Type) Pier Foundation (Material/Type) Historic Status 4 - PILE BENT 2 - TIMBER 4 - PILE BENT Underwater 60 Pinned Asbly. Spec. Feat Navigation Control Year Painted 926 sq. Traffic 50B. Rt 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 + Bridge Railing 0 - SUBSTANDARD N - No parallel structure GR Transition Appr. Guardrail GR Termini 2 - TIMBER Frac. Critical 2 - Vehicle & Semi (Type R12-5) 0 - Not Required Horizontal 1 - Object Markers 0.50 Vertical Unsound Paint % Finish Type + 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 ANGORA CR 597 Desc. Loc. BMU Agreement Year Built 1956 MN Year Reconstructed FHWA Year Reconstructed MN Temporary Status Bridge Plan Location Date Opened to Traffic Maint. Area Roadway O/U Key Detour Length 99 mi. Lanes Route On Structure On - Off System 0 - OFF Roadway Width Legislative District 05A Vertical Clearance Potential ABC 2 - N/A Max. Vert. Clear. Service On 1 - Highway Appr. Surface Width Service Under 0 - NO PLAN + 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 2003 N - Not Applicable + I N Drainage Area (sq. mi.) + W A T E R W A Y + Waterway Opening (sf.) 360 Pier Protection Posting Rating Date 02/21/2015 N - NOT REQUIRED N - NOT REQUIRED N - NOT REQUIRED D E P T H I N S P. + Y/N Freq Date 06/21/ No nav. control on VEH: 34 SEMI: 40 DBL: 40 Overweight Permit Codes Rail Type Lt 37 Rt 37 A N - N/A B N - N/A C N - N/A sq. ADTT 09 - Rural - Local 27.0 S I G N S + Structurally Deficient Sufficiency Rating 59.9 Inspection Date 06/28/2016 Inspection Frequency 12 Inspector Name + N B I Nav. Clr. () Nav. Vert. Lift Bridge Clear. () Vert. 0.0 Horiz. 0.0 MN Scour Code K - LIMITED RISK Year C A P A C I T Y R A T I N G S + Design Load Operating Rating Janulis, Lukas P - Posted for Load C O N D I T I O N Deck 5 Unsound Superstructure 6 Deck % Underclearances Waterway Adequacy 8 Approach Alignment 8 0 D I M E N S I O N S + NB-EB % SB-WB Substructure Channel 5 Culvert + N B I Structure Evaluation 4 Deck Geometry Other/Unknown 2 - HS TRUCK R A T I N G S Inventory Rating 2 - HS TRUCK Y N N A P P R A I S A L R A T I N G S + N + S A F E T Y F E A T U R E S + Page 7 of 15

8 12/19/2016 Inspector: CO Bridge MINNESOTA BRIDGE INSPECTION REPORT BRIDGE County: City: Township: Section: 29 Township: 061N Range: 18W Maint. Area: Span Type: 3 - Steel 2 List: St. Louis ANGORA NBI Deck: 5 Super: 6 Sub: 4 Chan: 5 Culv: N Appraisal Ratings - Approach: Required Bridge Signs - Load Posting: CR 597 OVER RICE RIVER 8 Waterway: 8 Horizntal: Location: Route: Control Section: 2 - Vehicle & Semi (Type R12-5) 1 - Object Markers 0.3 MI N OF JCT CR CNTY 597 Local Agency Bridge Nbr.: 355 Open, Posted, Closed: MN Scour Code: Traffic: Vertical: Ref. Pt.: P - Posted for Load K - LIMITED RISK 0 - Not Required N - Not Applicable Length: Deck Width: Rdwy. Area/ Pct. Unsnd: 926 sq. / % Paint Area/ Pct. Unsnd: Culvert: N/A sq. / % Postings: Unofficial Structurally Deficient Unofficial Functionally Obsolete Unofficial Sufficiency Rating 59.9 Y N ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Timber Deck 12/14/ SF Underwater Notes: [2016] Water leaking through deck removing timber preservative. 06/28/ SF Wearing Surfaces Underwater 12/14/ SF /28/ SF Notes: [ ] Bituminous peeled off on north end. Potholes forming in bituminous overlay with bituminous breaking up. Bituminous has cracks throughout deck. Steel Open Girder/Beam 12/14/ LF Underwater 06/28/ LF Notes: [ ] 9 lines of beams, simple span (S.S.), between abuts and piers. Paint flaking on most beams. Paint gone at abutments. Little rust above abutments. No section loss Steel Protective Coating Underwater 12/14/ SF /28/2016 Notes: [2016] Paint flaking on most beams. Paint gone at abutments 2218 SF Timber Abutment 12/14/ LF Underwater 06/28/ LF Notes: [2016] Added 48 LF to abutment quantity to account for wingwalls. [ ] Possible backfill loss north abutment. Gap under bottom backing board, most noticeable west end of abutment. Moderate weathering with splits and checks. N. abut cap rotating slightly out of alignment. N. Piles constantly in water and exhibiting moderate decay of internally and in the shell. Wings have moderate weathering with splits and checks. Damage to end of SW wing from equipment during brush clearing. North abutment pushing in slightly. North wings are stiffened with railroad rail horizontally fixed with cables to wings. Timber Pile 12/14/ EA Underwater 06/28/ EA Notes: [2016] Added 8 piles for wing piles. All piles have moderate to extensive decay. [ ] North Piles and pier piles constantly in water and exhibits moderate to severe decay. East pile north abutment has shell delamination, dented when hit about 1' below cap. West pile on pier has 1/2" wide split on south side top 3' to center of pile. North abutment piles stiffened with beams fixed vertically. Second pile from west stiffener fell off. Moderate weathering with splits and checks. Timber Pier Cap 12/14/ LF Underwater 06/28/ LF Notes: [ ] Pier cap W. end, slight crack, rotated 1 degree, and slight loss of bearing on West end. South abutment cap 100% bearing and sitting normal to caps. North abutment cap rotating 1 degree. N abut, W end, pile cap slight crack at end. Page 8 of 15

9 BRIDGE CR 597 OVER RICE RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Fixed Bearing 12/14/ EA Underwater 06/28/ EA Notes: [ ] Minor surface corrosion on fixed bearings at abutments with little to no section loss. Pier bearings have some flaking paint with exposed steel having minor surface corrosion. Metal Bridge Railing 12/14/ LF Underwater 06/28/ LF Notes: [ ] The protective coating has failed with surface corrosion on about 75% of flexbeam. [ ] Flex beam has corrosion and scrapes throughout. Angle iron posts have paint flaking with minor surface corrosion. No section loss. Flex Beam w/ Angle Iron Posts Steel Protective Coating Underwater 12/14/ SF /28/2016 Notes: [2016] 75% of paint has failed. Rest of paint is flaking. 276 SF Critical Deficiencies or Safety Hazards 12/14/ EA Underwater Notes: [ ] No critical deficiencies or safety hazards found during this inspection. 06/28/ EA Gravel Approach Roadway 12/14/ EA Underwater Notes: [2016] Potholes in approaches have been fixed by grading of roadway. [2015] Potholes along south edge of deck with no significant increase in traffic impact. [ ] No signs of settlement or undermining. 06/28/ EA Substructure Settlement & Movement 12/14/ EA Underwater Notes: [ ] Movement appears to have arrested. 06/28/ EA Scour 12/14/ EA Underwater Notes: [ ] No signs of scour present. K - Limited risk. Monitoring required. 890 Load Posting or Vertical Clearance Underwater Signing 06/28/ EA /14/ EA /28/ EA Notes: [2016] Correct posting in place with no deterioration. [2015 Update] 34T/40T/40T Load posting signs placed at bridge that match February 2015 load rating. Other Bridge Signing 12/14/ EA Underwater Notes: [2016] South delineators are slightly bent. [2015] All signs present with no notable deterioration. [ ] 4 Delineators present. SE delineator leaning North. 06/28/ EA Slopes & Slope Protection 12/14/ EA Underwater 06/28/ EA Notes: [ ] Possible backfill loss North abutment, gap under bottom backing board most noticeable at West end of abutment. No riprap in place. Deck & Approach Drainage 12/14/ EA Underwater 06/28/ EA Notes: [ ] Minor ponding on deck from bituminous deterioration. Scuppers free of debris. Some gravel along gutterline of deck. No drainage related slope erosion. Page 9 of 15

10 BRIDGE CR 597 OVER RICE RIVER ELEM NBR ELEMENT NAME REPORT TYPE INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 Sidewalk, Curb, & Median 12/14/ EA Underwater Notes: [ ] North end of east curb coming loose. [2013] Scuppers. Minor weathering with splits and checks. 06/28/ EA Protected Species 12/14/ EA Underwater Notes: [2016] Swallow nest present span 2 beam 2 06/28/ EA 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: SLC District 3 Inspected by: [2016] CG, JB : [2015] CG, TM : [2015 Update] CG : [ ] CG, BH. [2015 Update] Update inspection to update signing element due to load posting signs being placed at bridge and to upload date stamped photos. Went under with boat '09, 2012 [ ] Bituminous peeled off on north end. Potholes forming in bituminous overlay with bituminous breaking up. Water leaking through deck removing timber preservative. Flexbeam with angle iron posts. Bridge is wider than approach and ADT < 400, guardrail not required. Bridge is wider than approach and ADT < 400, guardrail not required. Bridge is wider than approach and ADT < 400, guardrail not required. [ ] 9 lines of beams, simple span (S.S.), between abuts and piers. Paint flaking on most beams. Paint gone at abutments. Little rust above abutments. No section loss. [ ] Pier piles have large splits near top. Pile 1B has extensive splitting and decay. [2013] Possible backfill loss North abutment, gap under bottom backing board most noticeable at West end of abutment. Moderate to significant weathering and decay with splits and checks. N. abut cap rotating slightly out of alignment. N. Piles constantly in water and exhibiting moderate to significant decay of internally and in the shell. North abutment pushing in slightly. [ ] Channel shows signs of movement to the north. No slope along north abutment. 62. Culvert NBI: 71. Waterway Adeq NBI: 72. Appr Roadway Alignment NBI: [2016] Approach north and south of bridge slightly lower than bridge. Approaches would overtop before bridge. [ ] No sight distance issues or speed reduction required. Inventory Notes: Inspector's Signature Reviewer's Signature Page 10 of 15

11 Pictures Photo 1 - Upstream Fascia, Looking Northwest Photo 2 - Downstream Fascia, Looking Southeast Page 11 of 15

12 Pictures Photo 3 - Bent 1, Looking Southeast Photo 4 - North Abutment, Looking Northeast Page 12 of 15

13 Pictures Photo 5 - Split in Pile C of Bent 1, Looking South Page 13 of 15

14 N ~ S. Abutment ~ Bent 1 ~ N. Abutment 23' 23' INSPECTION NOTES: 1 The channel bottom material typically consisted of gravel and sandy silt with a maximum probe rod penetration of 6 inches The timber piles were typically heavily weathered with checking and n/a spliting up to inch wide. The outer 2 inches of timber pile shells A were typically unsound. 3 Pile A of Bent 1 had a 1 inch split extending from the pile cap down 2.5 feet with up to 8 inches of penetration. The pile was unsound 1 B along the length of the split. A hollow core was visible though the crack with an estimated 15 percent loss of pile section. 4 Pile C of Bent 1 had a 1/2 inch split extending from the pile cap to (Typ.) Flow Rice River 6 C D 1.4 feet below the waterline with up to 4 inches of penetration. 5 The south cross-brace at Bent 1 exhibited heavy decay on the upstream end with up to 40 percent loss of section. 6 Backwall timbers were typically sound and tight with no notable gaps, deterioration, or loss of backfill. GENERAL NOTES: 5 E 1. The North Abutment and Bent 1 were inspected during the underwater inspection n/a n/a 2. At the time of inspection on June 21, 2016, the waterline was located approximately 3.2 feet below the top of the pile cap at the downstream end of the Bent 1. Since elevation information was not available a reference elevation of was assumed. Based on the assumed reference the waterline elevation was SOUNDING PLAN Shoreline (Typ.) 3. Soundings indicate the water depth at the time of inspection and are measured in feet. 3" x 12" Timber Backwall Board (Typ.) 12" Timber Pile (Typ.) 3"x12" Timber Cross-Bracing Legend -5.2 Sounding Depth from Waterline (6/21/2016) MINNESOTA 12" Timber Pile (Typ.) -4.5 Sounding Depth from Waterline (9/19/2012) DEPARTMENT OF TRANSPORTATION UNDERWATER BRIDGE INSPECTION A Pile Identification Designation STRUCTURE NO CR 597 0VER THE RICE RIVER DISTRICT 1, ST. LOUIS COUNTY 12-inch Diameter Timber Pile INSPECTION AND SOUNDING PLAN TYPICAL END VIEW OF ABUTMENTS TYPICAL END VIEW OF BENT Abandoned 12-inch Diameter Timber Pile DRAWN BY: MBP 123 North Wacker Drive DATE: JUNE 21, 2016 Page 14 of 15 1 Inspection Note Number CHECKED BY: LJ CODE: Suite 900 Chicago, Il (312) SCALE: NTS FIGURE NO.: 1

15 ~ South Abutment ~ Bent 1 ~ North Abutment 23' 23' Shoreline Shoreline W.L. El Channel Bottom on 9/19/2012 Channel Bottom 90.0 on 6/21/ DOWNSTREAM FASCIA PROFILE ~ South Abutment ~ Bent 1 ~ North Abutment 23' 23' Shoreline Shoreline W.L. El Channel Bottom on 9/19/ Channel Bottom on 6/21/ UPSTREAM FASCIA PROFILE Note: Refer to Figure 1 for General Notes. MINNESOTA DEPARTMENT OF TRANSPORTATION UNDERWATER BRIDGE INSPECTION STRUCTURE NO CR 597 OVER THE RICE RIVER DISTRICT 1, ST. LOUIS COUNTY UPSTREAM AND DOWNSTREAM FASCIA PROFILES DRAWN BY: MBP 123 North Wacker Drive DATE: JUNE 21, 2016 CHECKED BY: LJ Suite 900 Chicago, Il (312) SCALE: 1"=5'-0" Page 15 of 15 CODE: FIGURE NO.: 2