Trailwood & Chestnut – Stormwater Improvements – Desloge, MO

Trailwood & Chestnut – Stormwater Improvements – Desloge, MO

Case Study

Trailwood & Chestnut – Stormwater Improvements – Desloge, MO

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Project Overview

Improvements to the underground stormwater system under existing residential streets and sidewalks in Desloge, MO were needed to include the upgrade of a 440′ section of 42” HDPE pipe. Shallow bedrock limited the depth the pipe could reside, while a high water table created buoyancy issues requiring some form of a supplemental ballast system.

Solution

The Engineer’s buoyancy calculations revealed the new pipe sections had a net uplift buoyancy force of ~370 lbs./ft. (7,425 lbs. per 20′ pipe section). It was determined that three Platipus S6C 2 ton pipe kits per 20′ section would provide 2,476 lbs. of force every 6′-8′, thus eliminating the buoyancy risk. The underlying bedrock mandated the use of cast iron Platipus S6 anchors driven to a depth of 5′. The convenience and ease of installation of the pipe kits using hand-held tools resulted in a cost-efficient solution with low environmental impact.

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Decompartmentalisation & Sheetflow Enhancement of Water Conservation – USA

Decompartmentalisation & Sheetflow Enhancement of Water Conservation – USA

Case Study

Decompartmentalisation & Sheetflow Enhancement of Water Conservation – USA

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Project Overview

The Water Conservation Area 3 (WCA-3) Decompartmentalization and Sheetflow Enhancement Project (Decomp Project) is designed to restore the natural ecology and hydrology of the WCA-3 portion on the Everglades. The project required 10 parallel runs of triple wall 60” Ø HDPE pipe in order to provide flow equalization between the two sides of a levee that runs north and south through the Everglades. The pipes had to be strapped down in order to prevent floatation during large storm events.

Solution

Based on an engineered required load of 12,000 lbs per location, Platipus offered a 10 ton ultimate capacity anchor system that was composed of S8 galvanized spheroidal graphite iron anchors and a combination of 8mm stainless steel wire cable and 50mm nylon webbing. The predominate soil types present on site were solid limerock at the surface and a dense sand layer beneath. Pilot holes had to be drilled through the limerock in order to drive the anchors to the required depth.

Sixty pipe anchoring kits, or 120 anchors, were installed in 3 days. The anchors were driven and loadlocked, the pipe was placed, and then the webbing and buckles were installed. This process was much faster than other competitive systems that involve forming and pouring concrete or filling and placing multiple sand bags over the pipes.

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Town Center at Haddon Underground Storage System – USA

Town Center at Haddon Underground Storage System – USA

Case Study

Town Center at Haddon Underground Storage System – USA

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Project Overview

In an effort to redevelop the Haddon business district, a mixed-use apartment and retail center was constructed in the urban downtown in the hopes of bringing several hundred residents to an area previously sustained by commuters. One of the main challenges to development was the increase of runoff and how to manage its storage and discharge without disrupting the existing infrastructure. The ADS N-12 Pipe retention/detention system was selected to reduce the rate and volume of the discharge. The project required the installation of four rows of 48” HDPE pipes secured with a Platipus 2 Ton Pipe Buoyancy Control system below the new development.

Solution

An analysis by the geotechnical engineer concluded that the sum of the weight of the soil and pipe was not sufficient to resist the potential vertical hydrostatic uplift force of the underground storage system due to the water table and limited amount of overburden. The structure required 834lbs/ft. to secure the underground system while meeting the required factor of safety of 1.5. The Platipus S8 anchor was selected after a review of the soils indicated a shallow water table and seasonal undrained soils. The contractor installed this solution at each bell end and evenly spaced at 4′ increments along the 20′ pipes.

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