Deep pile foundation construction methodology for existing and new buildings

摘要

A method is provided for using low-overhead equipment to construct a deep piling foundation for an existing building. The method involves lifting the existing building to a predetermined elevation above grade and positioning cribbing stacks to support the existing building at the predetermined elevation above grade. The cribbing stacks are spaced from each other enabling low-overhead equipment to maneuver underneath the elevated building to drill drive pipe piles at designated locations to provide optimal support for the building. Grout is pumped under pressure into the pipe piles continuously during the drill driving of the pipe piles so that grout exits through a grout port to mix with disturbed soil about the pipe pile to encase the pipe pile in a grout-soil mixture. Pile caps are attached to each pipe pile and secured to the existing building so that the existing building is supported by an array of the deeply driven pipe piles which serve as the foundation for the building.

主权项

1. A method for using low-overhead equipment to construct a deep piling foundation for an existing building, comprising the steps of:
a) lifting the existing building to a predetermined elevation above grade; b) positioning a plurality of cribbing stacks to support the existing building at the predetermined elevation above grade; c) positioning the plurality of cribbing stacks such that each of the plurality of cribbing stacks is spaced from each other cribbing stack at least a predetermined distance, the predetermined distance being greater than the greatest width of the low-overhead equipment; d) identifying the locations for the placement of each of a plurality of pipe piles beneath the elevated existing building; e) driving one of the plurality of pipe piles at each identified location using low-overhead equipment, each of the plurality of pipe piles comprising a starter pile segment and at least one pile shaft segment, each of the plurality of pipe piles having the starter pile segment at one end and an uppermost pile shaft segment at the opposite end, the starter pile segment creates disturbed soil surrounding the starter pile segment as the starter pile segment is driven; f) injecting grout under pressure into at least one of the plurality of pipe piles during the driving thereof so that grout exits through a grout port to mix with the disturbed soil to encase the pipe pile in a grout-soil mixture; g) leaving a portion of each pipe pile above grade; h) preparing the uppermost pile shaft segment of the pipe pile to receive sensors for load testing; i) load testing at least one of the plurality of pipe piles as driven; j) attaching one of a plurality of pile caps to each pipe pile; and k) securing the existing building to each of the plurality of pile caps.