Construction method of reducing cast-in-place pile

Abstract

The invention provides a construction method of a reducing cast-in-place pile. The construction method of the reducing cast-in-place pile comprises the following steps: a), fixing a pile position, and fixing a boring machine; b), boring with the boring machine to a designed bore depth, moving the boring machine out of a pile bore, and moving a diameter reducer into the pile bore, wherein the diameter reducer comprises a grouting pipe, a pressure-resistant component is welded at the bottom end of the grouting pipe, and a force applying hammer is arranged on the outer side of the pipe wall of the grouting pipe in a sleeving manner; c), moving the pressure-resistant component to a position below a diameter-expanded section, pouring concrete into the pile bore through the grouting pipe, and stopping pouring when a concrete layer is 2-3 m above the pressure-resistant component; d), making the force applying hammer to do a motion of a free falling body repeatedly to repeatedly hammer the concrete layer till complete the diameter-expanded section; e), moving the diameter reducer to a position below another diameter-expanded section, repeating the step c) and the step d) till complete all diameter-expanded sections, and taking the diameter reducer out of the pile bore; and f), inserting a reinforcement cage into the pile bore, and solidifying and molding the concrete. By the construction method of the reducing cast-in-place pile, the diameter-expanded sections can be formed in the cast-in-place pile; and the construction process is simple.

Description

technical field [0001] The invention relates to the construction field, in particular to a construction method of variable-diameter cast-in-place piles. Background technique [0002] At present, cast-in-situ piles are more and more used in high-rise buildings and large structures. How to improve the bearing capacity of cast-in-situ piles is the biggest requirement for cast-in-situ pile construction. The bearing capacity of the pile is the result of the joint action of the resistance on the side of the pile and the resistance on the end face of the pile. Therefore, increasing the area of ​​the pile side and increasing the resistance per unit area on the side of the pile, or increasing the area at the end of the pile and increasing the resistance per unit area on the end surface of the pile can increase the bearing capacity of the pile. Such as figure 1 As shown, the traditional bored pile has the same cross-sectional area everywhere in the pile body and at the pile end. Su...

AI Technical Summary

Problems solved by technology

This construction method increases the labor intensity, increases the construction period, and increases the engineering cost, which hinders the popularization and use of variable-diameter cast-in-place piles.

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