Construction method of CFG pile composite foundation

Abstract

The invention relates to a construction method of a cement flyash gravel (CFG) pile composite foundation. The construction method comprises the following steps: S1, arranging a pile point: digging a foundation pit according to a construction drawing, compacting and flattening a foundation soil layer at the bottom of the foundation pit, fixing a bottom plate at the bottom of a positioning piece onthe foundation soil layer according to the construction drawing and guaranteeing that the bottom plate is in a horizontal state, wherein a shaping pipe vertically arranged on the surface of the bottomplate is a reserved pile drilling point; S2, drilling and manufacturing a pile; S3, back-filling a first soil sealing layer; S4, building a pile cap; and S5, paving fillers. According to the construction method, the soil among the piles can be back-filled instead of being cleaned by digging the foundation pit and back-filling for many times; the operation space can be increased, soil digging andback filling can be completed rapidly, and the construction efficiency is significantly improved compared with that of the traditional method; the shaping pipe enables a pile body to be poured into the required pile top height at one time without cutting operation, so that the safety and the construction efficiency are enhanced; and a shaping piece can serve as a calibration reference piece, so that a worker can intuitively see the punch position of a spiral drill rod.

Description

technical field [0001] The invention belongs to the technical field of CFG pile construction, in particular to a CFG pile composite foundation construction method. Background technique [0002] CFG pile means cement fly ash gravel pile, which is a variable strength pile with a certain strength made of crushed stone, stone chips, sand, fly ash mixed with cement and water, and made by various pile forming machines. CFG pile is a low-strength concrete pile, which can make full use of the bearing capacity of the soil between the piles, and can transfer the load to the deep foundation, with good technical performance and economic effect; [0003] The main construction sequence of the current CFG pile composite foundation is: surveying and setting out-drilling rig in place-drilling into the hole-mixing material pouring and pulling the tube-cleaning the soil between the piles-building pile caps-backfilling the soil between the piles-laying filler; [0004] The initial construction...

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Problems solved by technology

[0004] The initial construction height of the pile body in the above construction method will exceed the preset height of the pile top, so it is necessary to clean the soil between the piles, so that the top of each pile body is exposed to the required height, and then manually use a cutting machine to cut off the excess part of the pile body; In the process of cleaning the soil between the piles, the excavation depth is not easy to grasp, and the operation space between the piles is limited, and the cleaning construction is very time-consuming and laborious; in the subsequent cutting operation, due to the severe collision between the cutting machine and the pile body, cutting equipment injuries often occur In addition, the cut cement column needs to be moved out of the construction site

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