mta-bor2980-1_SunRiverBridge_SiphonInspectionReport.pdf
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- Attached to
- MT FLAP BOR 2980(1), Sun River Bridge Replacement Federal contract opportunity
- Solicitation number
- 69056724B000016
About this file
This document is an inspection report for the ROV (remotely operated vehicle) inspection of the Sun River Siphon in Augusta, Montana, performed by Hibbard Inshore, LLC on August 21, 2023. The goal of the inspection was to detect obstructions, material buildup, cracks, holes, and signs of structural degradation within the 600-foot siphon. The ROV was equipped with sonar and video equipment, and the inspection involved an outbound run on the invert and a return run on the crown of the siphon. The report includes detailed observations, photographs, and sonar images documenting the general condition of the siphon, including minor debris, sediment levels, construction joints, and isolated areas of concrete spalling. No major issues were identified. This report is meant to be referenced along with the inspection data collected during the ROV survey.
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Text version
Report
For the
ROV Inspection Of the
Sun River Siphon In
Augusta, Montana For
Parametrix
Version 1 September 15, 2023
Job 230610
From:
Hibbard Inshore, LLC.
2285 N. Opdyke Rd. STE A Auburn Hills, Michigan 48326
USA
Attn: Dave Malak +1.248.745.8456x13 Voice, +1.248.891.5019 Cell dave.malak@hibbardinshore.com mailto:dave.malak@hibbardinshore.com
Hibbard Inshore, LLC. September 15, 2023
Table of Contents Page 2 of 30 Ver. 1
1 Table of Contents
1 Table of Contents 2 Executive Summary 3 Inspection Method
3.1 Inspection Plan
3.2 Tether Chainage or Tether Payout
3.3 Video Capture Date and Time
3.4 Right and Left
3.5 ROV Depth
3.6 Inspection Note Terms
4 Inspection Observations
4.1 General Comments
4.2 Observations – Outbound Run on Invert
4.3 Observations – Return Run on Crown
5 Conclusion 6 Appendix
6.1 Saab Seaeye Falcon
6.2 Tritech Gemini 1200ik
6.3 Pilot Notes
6.3.1 08/20/2023
Executive Summary Page 3 of 30 Ver. 1
2 Executive Summary
Hibbard Inshore, LLC. provided inspection services to Sun River 600’ Siphon for Parametrix on August 21st, 2023. The goal was to detect obstructions and buildup of materials in the line, open joints, cracks, holes, and signs of collapse or major degradation within the siphon. This inspection used sonar as the primary inspection sensor to detect features and video to confirm feature types and conditions.
A Seaeye Falcon remotely operated vehicle (ROV) performed the work and was equipped with High-definition video, standard definition video, lights, cable payout counter, forward-looking multibeam sonar, and profiling sonar. The ROV flight path used forward-looking sonar for feature detection and used the video for spot checks of features detected on sonar.
The sensor data from the Falcon ROV was recorded by a 4 channel DVR. This included a standard definition low light video camera, HD video camera, auxiliary camera, and forward multibeam sonar recorded as video. Overlaid on the standard definition video was the ROV instrument data such as depth and heading. Overlaid on the forward-looking sonar was the cable payout and station.
This report is a summary of the data collected and the conduct of the operations for the Sun River Siphon.
This report is intended to be referenced in addition to the inspection data.
Inspection Method Page 4 of 30 Ver. 1
3 Inspection Method
The inspection was designed to detect obstructions and buildup of materials in the line, open joints or open cracks, holes, signs of collapse or major degradation using multiple types of sonar and video. The ROV used forward looking multibeam sonar to image the tunnel ahead of the ROV so that features of significant size could be detected. When features of note were located on sonar, the ROV was flown so that the video camera could get an image. The ROV entered the tunnel flying on the invert and returned on the crown. In both travel directions, the ROV was facing upstream. A profiling sonar was available to record cross sections to measure if any measurable debris buildup had accumulated. A cable payout counter was used to show the distance of the ROV from the downstream gate slot. Shortly into the inspection, the cable payout had the station added onto the screen. The video channel with the forward looking sonar had a small window with cable payout and station overlaid. While the inspection was underway, drawings were referenced to identify the vertical elbows in the pipe and other features. At the end of the inspection when the ROV returned to the access point, the cable counter distance was noted and the slippage in the tether counter recorded.
3.1 Inspection Plan
The ROV first flew along the invert to search for debris build in the lower areas since the structure is an inverted siphon and could trap heavier debris. The return trip on the crown was to search for any signs of structural degradation.
Figure 1: Downstream opening of siphon where Falcon ROV was launched and recovered.
Inspection Method Page 5 of 30 Ver. 1
3.2 Tether Chainage or Tether Payout
The tether payout was reset to zero at the initial point of entry into the tunnel. This was the plane of the outlet stop log slot.
3.3 Video Capture Date and Time
This report will refer to inspection data, pictures, and the video record based on time. The format of these videos is MMDDYYYY_HHMMSS_CH#. For example, 08152023_133911_1, is August 15, 2023, with the video starting at 13:39:11 Channel 1.
All still images in this report are also included with the naming convention STA #- hhmmss – Description.
The video channels are as follows:
Channel 1 – Standard Definition Camera 1 (with depth, heading and other data overlay)
Channel 2 – Forward-Looking Gemini Sonar (with cable payout and station overlay) Channel 3 – SD Brush and UT Gauge Camera
Channel 4 – High-Definition Camera
On the Standard Definition video channel (Channel 1) there is a redundant clock on the video overlay from the ROV that has an incorrect clock time, use the time overlay that looks the same as the time on the other videos.
3.4 Right and Left
The written comments on the inspection will indicate the location of the ROV or a feature based on “right” or “left”. The orientation for the right or left is based on the observer facing the direction of travel for the ROV. For this report, the right and left aren’t related to the direction of flow. The ROV was facing upstream during the inspection.
3.5 ROV Depth
The depth displayed by the ROV is measured from a pressure sensor on the ROV. Zero depth is the surface of the water. The sensor is calibrated for fresh water and is set to zero at the water surface at the job site.
The water level was at the invert of the outlet canal channel as the canal was dry during the inspection.
3.6 Inspection Note Terms
The inspection notes use several terms to describe observations.
• Debris on Invert
Debris on the invert is any notable accumulation of organic substances, usually sediment, rock, wood, or mussel shells.
• Features
Features are anything worth noting that vary for the standard crack, void, or debris. These features can include changes in the intensity of a return. This can indicate a variation in construction technique, materials, or texture.
Inspection Observations Page 6 of 30 Ver. 1
4 Inspection Observations
4.1 General Comments
In general, there was very little sediment on the invert of the tunnel. The profiling sonar took a reference cross section to show the level of sediment was not measurable. The sediment was sufficient to limit the video camera view when the ROV was near bottom as there were fish present that were kicking up the sediment into a cloud ahead of the ROV. The typical debris located other than sediment were pieces of concrete from the channel and not the tunnel. The pieces were flat in nature and identical to the ones visible in the dry part of the channel. Sonar observed the circumferential tunnel joints and a video confirmed the condition.
4.2 Observations – Outbound Run on Invert
Figure 2: STA 4+408 – 22:33:21 - Joint left wall.
Page 7 of 30 Ver. 1
Figure 3: STA 4+543 – 22:25:10 - Gemini showing debris on invert about 20 feet ahead of ROV.
Figure 4: STA 4+526 – 22:27:57 – Video of Debris from the sonar image shown in Figure 3
Page 8 of 30 Ver. 1
Figure 5: STA 4+658 - 22:18:53 - Offset construction joint right spring line.
Figure 6: STA 4+692 – 22:07:59 - Stick on invert, less than ½” diameter.
Page 9 of 30 Ver. 1
Figure 7: STA 4+694 – 22:07:39 - Debris or scour on invert.
Figure 8: STA 4+703 – 22:06:39 - Shotcrete along left wall and invert.
Page 10 of 30 Ver. 1
Figure 9: STA 4+721 – 21:57:37 – Shotcrete.
Figure 10: STA 4+731 – 22:12:58 - Construction joint left wall and invert.
Page 11 of 30 Ver. 1
Figure 11: STA 4+746 – 23:06:21 - Crown spalling at joint.
Figure 12: STA 4+751 – 23:06:26 – From previous, Gemini showing crown spalling.
Page 12 of 30 Ver. 1
Figure 13: Profile – Sampe to show transition between round tunnel and rectangular cross section at the outlet end of the structure.
ROV
Tunnel crown
Tunnel Invert
Right Wall
Page 13 of 30 Ver. 1
Figure 14: Profile – Sample cross section in lower area of tunnel to show that the sediment level was not measurable.
ROV
Tunnel crown
Tunnel Invert
Right Wall
Conclusion Page 14 of 30 Ver. 1
4.3 Observations – Return Run on Crown
Figure 15: STA 4+194 – 22:51:07 - Construction joint Crown. Typical condition.
5 Conclusion
In general there was minor debris present. The buildup of the sediment was a fraction of an inch and not enough to measure with the cross section sonar. There were a couple of sticks and a number of pieces of shotcrete from the canal walls that were located on the invert. Typical pieces of shotcrete were 1 to 2 inches thick and from 6” to 18” wide. One region of spalled concrete was located on the invert and many joints were identified on sonar and video to show edge spalling, slight offset, and general condition.
No large cracks were located. The sample video screenshots and sonar screenshots in the report are the most notable features from the inspection.
Appendix Page 15 of 30 Ver. 1
6 Appendix
6.1 Saab Seaeye Falcon
Page 16 of 30 Ver. 1
6.2 Tritech Gemini 1200ik
Specification:
High Frequency Mode Low Frequency Mode
Operating frequency 1200kHz 720kHz
Range 0.1m – 50m 0.2m – 120m
Number of beams 1024 512
Horizontal beamwidth 120° 120°
Vertical beamwidth 12° 20°
Range Resolution 2.4mm 4mm & 8mm
Depth rating 350 350m
Weight in air 1.46kg 1.40kg
Weight in water .44kg 0.43kg
Page 17 of 30 Ver. 1
6.3 Pilot Notes
6.3.1 08/20/2023
Time Tether Station Observations
09:54:06 13 4736 ROV at water edge entering outlet facing upstream
10:04:55 28 4751 start dive
10:07:08 video shotcrete chunk left
10:10:44 69 4792 sonar sample section
10:13:24 4730 left construction joint
10:15:17 4720 minor sediment on bottom
10:18:13 4680 form joint
10:19:22 4756 right springline joint - const offset
10:26:53 4536 sloppy const joint right
10:27:59 4529 debris right side
10:32:05 4448 increased sediment
10:33:49 4407 video of joint near bottom transition
10:36:04 4389 bottom, minor sediment
10:49:19 4141 run completed on invert, turning on crown
10:58:23 4425 RH elbow visible on sonar
11:08:41 4817 end run (-67.5) should be zero
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