The International Information Center for Structural Engineers

Friday, 06 September 2019 00:00cat

Petrochemical Sump and Pipe Support by Hayward Baker

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Completed internally-braced sheet piles shown in the background while a rig installs helical piles. Completed internally-braced sheet piles shown in the background while a rig installs helical piles.

Hayward Baker worked on a sheet pile & helical pile installation in restricted access conditions in a busy petrochemical facility. The client added a new sump area and needed to support the new concrete sump floor. Along with the new addition, the client also required deep foundation support of new pipe bridges and supports and retrofitting existing supports (concrete bell piers) with new helical piles in the main corridor of the facility. The subsurface soils generally consisted of lean-to fat clays in loose to medium soils 20 to 30 ft deep.

Construction of the sump required earth retention to protect adjacent plant facilities. The system consisted of internally-braced sheet piles designed and installed by HBI. The elevation of the floor was located about 24 ft below the existing grade, which was to be excavated. The concrete sump floor was to be poured prior to helical pile installation. Due to difficult access constraints, the installation method was limited to working from the existing grade. Also, an existing clarifier tank adjacent to the new sump limited HBI's access around the sump. The location of all new and retrofit pipe support locations was located along a busy corridor within the plant, limiting the helical pile section, drive motor, and excavator sizes.

A combination of helical piles and sheet piles allowed for the construction of the sump. The project team worked with the general contractor and engineers to provide an alternate solution that met the original design load requirements. Hayward Baker completed work in restricted access conditions safely and on time.

Source: Petrochemical Sump and Pipe Support Project

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