Dug pile foundation construction method

Abstract

The invention discloses a dug pile foundation construction method, which comprises the following steps of: digging a hole, namely digging the hole vertical to the ground so as to facilitate entry and construction of at least one constructor, and tamping the hole along the hole edge; heightening the hole edge, namely building the hole edge with certain height to prevent hole collapse and prevent soil and stones outside the hole from falling into the hole; downwards digging the hole, namely downwards digging the hole to the depth required for a pile foundation; expanding the lower part of the pile foundation hole, namely outwards expanding the pile foundation hole close to the bottom at a predetermined position to form a cone, wherein the cone slope is in a range of 34 to 45 degrees and the lateral depth of the cone slope is less than 1 meter; forming a circular table with certain thickness on the lower part of the conical hole; and placing steel bars into the formed hole and pouring concrete into the hole to form a dug file foundation. The method does not need to construct a base face, does not damage the soil outside the pile foundation, and keeps the periphery of the pile foundation as undisturbed soil so as to well protect the environment and improve the bearing capacity of the pile foundation.

Description

technical field [0001] The invention relates to a pile foundation construction method, more specifically, relates to a digging pile foundation construction method. Background technique [0002] At present, the foundation pits of the transmission line tower pile foundations are all formed by large excavation, and a large area of ​​foundation surface needs to be excavated, and the soil will be backfilled after the pile foundation is poured. Such construction method seriously damages the ground surface near the pile foundation because the pile foundation occupies a large area. When constructing in mountainous areas, it often needs to cut down a large amount of trees, and the excavation volume of earth and stone is also very large, so the construction is not easy. Usually, the base of the iron tower is more than 10 meters wide. Considering the stable range of the foundation, the area of ​​a base iron tower is usually about 500 square meters. It is not allowed for environmental p...

AI Technical Summary

Problems solved by technology

Such a large-scale excavation construction method does not meet the requirements of environmental protection. It seriously damages the surface and vegetation, causing water and soil loss; in addition to destroying the surface, it will also affect the stability of nearby rock and soil, causing secondary disasters; After the foundation surface is completed, the foundation soil backfilled has poor bearing capacity and is less resistant to pull-out, so the bearing capacity of the pile foundation is not high

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