Mesquite Street By-Pass Stormwater CIP Improvements

Mesquite Street By-Pass Stormwater CIP Improvements

Case Study

Mesquite Street By-Pass Stormwater CIP Improvements

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Project Overview

The purpose of the project was to mitigate flooding in the area by improving drainage conveyance toward the Gulf of Mexico. The project required a combination of single and double barrel runs of triple wall 60” HDPE pipe in order to provide additional drainage capacity for the town of Rockport.

Solution

Based on an engineered required load of up to 11,000 lbs per location, Platipus offered both 2 ton and 10 ton capacity anchor solutions, depending on the required loads in a particular area. The soil was a dense, well-compacted sand which allowed for high loads to be achieved. Approximately 270 pipe anchoring kits, or 540 anchors, were supplied over a 3-mile long drainage line. The anchors were installed with a traditional jack hammer. Each anchor was loadlocked and the load was recorded in order to field verify that the design load was achieved on-site. The ability to field-verify loads, in addition to the small amount of equipment required to install, allowed the Platipus system to be selected in lieu of a combination of poured concrete footings and stainless steel strapping mechanisms.

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MSD Shiva Court – Wildwood, St. Louis, MO

MSD Shiva Court – Wildwood, St. Louis, MO

Case Study

MSD Shiva Court – Wildwood, St. Louis, MO

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Project Overview

Construction of a block retaining wall was required for protection of stream bank during storm events. While soils were determined to be competent and able to stand at near vertical cuts, the risk of toe cutting and subsequent instability and mass wasting during increased flow from storm events forced MSD to require temporary shoring to eliminate those risks.

Options for shoring included, but was limited to: sheet pile, soldier pile with sheeting, braced sheeting, soil nailing, and tiered multi-plane shoring.  Sheet piling, soldier piles or any sort of bracing required removal after the wall had been constructed.

Solution

Upon temporary wall evaluation and weighing options, Platipus S6 ARGS assembly (1-ton rated) was selected to be installed on a 4’ horizontal by 4’ vertical spaced grid pattern. Anchors were installed perpendicular to slope face, driven to 12’ depth, and tensioned to the design working load of 1,100 lbs. using a Platipus SJ3 hydraulic load jack. The excavation and shoring was directed by the designing engineer to be constructed from the top down, in 4’ vertical lifts. The facing on the cut included a nonwoven filter fabric, a geogrid layer, a W4.0 x W4.0 Welded Wire Fabric, with point loading spread using 4” x 4” x 24” long timber restraints. The terminating end of the wire steel tendon included a 5” diameter 14 gauge stainless steel load plate and stainless steel conical wedge grip.     

The contractor enjoyed significant cost savings over conventional shoring options.

Bridgewater WWTP – Bridgewater, NJ

Bridgewater WWTP – Bridgewater, NJ

Case Study

Bridgewater WWTP – Bridgewater, NJ

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Project Overview

A proposed pump station for the SRVSA Stormwater Treatment Facility located in Bridgewater, NJ would require footers and foundations to be constructed 45’ below grade. Borings revealed the soil profile consisted of 8’ of fill/alluvial material and 8.5’ residual clay overlaying shale bedrock. Engineers also had to consider live loads (1,594 psf) associated with a nearby crane. For the soil reinforced elevations, the engineer determined that a tensile capacity of at least 6,000 lbs./ft (of wall/slope) was required to satisfy a factor of safety of 1.3 for temporary support.

Solution

The engineer determined that Platipus S8 ARGS (2 Ton Capacity) anchors placed on a 5’ horizontal by 3’ vertical grid pattern would safely support the required excavation, at least to the elevation where bedrock was expected to be encountered. As with any shoring of excavation application, top-down construction was required. Beginning with the initial 4’ cut, the first row of anchors were installed 23’ deep using a mini-excavator with an attached light weight breaker/hammer. Each S8 anchor was tensioned to the design working load of 2,000 lbs using a Platipus SK1 hydraulic jack and electric pump prior to excavation of subsequent lifts. Once bedrock was encountered, the contractor transitioned to an appropriate rock bolt/anchor (provided by Williams Form Engineering) that was specified by the engineer. Platipus engineering assistance and onsite support throughout the project made the S8 ARGS system the preferred method of shoring of excavation (of soils) for the contractor.

Eglin Air Force Base – Santa Rosa Island, FL

Eglin Air Force Base – Santa Rosa Island, FL

Case Study

Eglin Air Force Base – Santa Rosa Island, FL

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Project Overview

The US Army Corp of Engineers needed to stabilize an access road on to Santa Rosa Island. During tropical storms and hurricanes the road would overtop and eventually washout. The original solution was to drive steel sheet piling on each side of the road. In areas where the sheets were not parallel a concrete dead-man was to be installed as a tie-back for the sheet piling.

Solution

1250 Platipus Anchors were installed to a depth 25′ by Bridge Creek Construction, a certified Platipus Installer as an alternative to the tie-backs. Each anchor was loaded and certified to 40,000 lbs.

Atlanta Air Dome – Atlanta, GA

Atlanta Air Dome – Atlanta, GA

Case Study

Atlanta Air Dome – Atlanta, GA

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Project Overview

Prior to the City of Atlanta Hosting Super Bowl LIII in 2019 (for the 2018 season), contractors constructed a CMU wall to support a level pad to accommodate an air dome structure adjacent to the city’s Mercedes Stadium, home of the Atlanta Falcons. In subsequent months following the events during the Super Bowl, it was discovered that portions of the wall were tilting slightly.

Solution

Platipus B6 Anchors paired with Grade 75 #6 all thread rod were used to retrofit the tilting wall.  The anchors were placed strategically to stop further displacement of the retaining structure. The contractor installing the supplemental anchors used a mini-excavator with a light weight breaker attachment (~400 lbs) to drive the anchors 12’ deep, while Platipus’ SK2 hydraulic load jack and electric pump set up was used to load the anchors to the predetermined 5,000 lbs. loads required to halt further movement of the wall.