Bottom-expanding pile-forming method for immersed tube club-footed pile

Abstract

The invention discloses construction pile engineering and construction method, especially bottom expanding and pile forming method for sinking-pipe bottom expanded piles, comprising following steps: the whole sinking tube penetrating a soft soil layer to a hard soil layer of the designed elevation; taking out the metal pile head, throwing dispersed articles from the sinking tube mouth, expanding the bottom by using a bottom expanding device, digging soil until the designed base cavity mould is obtained; taking out soil for the second time by air until the soil is removed cleanly; inspecting the base cavity by using a camera with a light source and judging whether the design requirement is achieved; disposing the radial steel bar into the base cavity and hammering same into hard soil, pouring thick cement paste prepared on the ground along the tube opening into the base cavity, pouring stones into the base cavity to construct the concrete base, disposing the pre-stress prefab hollow pile body and anchoring same with the concrete base poured in situ integrally by the inserted bar at the bottom of the hollow pile body; pulling out the sinking tube. Thereby, the pile is constructed. According to the invention, the expanded bottom has a regular geometric figure, soil is taken out cleanly, no granule soil is left, and efficiency thereof is high.

Description

[0001] This application is a divisional application with the application number: 200610047891.1, the application date: September 26, 2006, and the invention name: bottom expansion and pile forming method of sinking tube bottom expansion pile. technical field [0002] The invention relates to a building pile foundation engineering and a construction method, in particular to a method for expanding the bottom and forming piles of bottom-expanding piles with sinking tubes. Background technique [0003] It is well known that the quality of building foundation works plays a vital role in the influence of building quality, so each construction unit not only pays attention to the construction quality of above-ground buildings, but also pays more attention to the quality of foundation works. And invest in scientific research to tap the potential of the pile foundation project, so that it can improve the utilization rate of material strength on the premise of ensuring the quality of th...

AI Technical Summary

Problems solved by technology

[0004]1. Part of the soil in the pile body was excavated manually, the construction surface was too large, the workload of soil extraction increased significantly, and the efficiency was low;

[0005]2. Since there is no immersed tube as support for the bottom expansion equipment, the positioning is not accurate, the expansion angle of the base is too small, and the parameters in the bottom expansion process cannot be guaranteed, so that the pile The quality of the pile is not easy to control, and it is difficult to meet the design requirements, resulting in a greatly reduced bearing capacity of the single pile;

[0006]3. There are potential safety hazards for construction personnel, and accidents are likely to occur if construction personnel do not pay attention;

[0007] 4. The scope of use is narrow, not only not suitable for small-diameter pile bottom expansion, but also not suitable for bottom expansion and bottom expansion of prefabricated piles and highly complex geological conditions. Pile;

[0008]5. The granular loose soil sediment in the cavity of the expanded bottom is not clean, which has a serious adverse effect on the bearing capacity of the pile. Based on the above situation, in order to improve the unit Pile bearing capacity, to reduce foundation engineering costs, must be improved

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