Correction method of concrete cast-in-place pile and construction method of cast-in-place pile on raft foundation

Abstract

The invention discloses a concrete cast-in-place pile rectification method and a raft foundation cast-in-place pile construction method, and relates to the field of pile foundation engineering. According to the scheme to deal with the excessive deviation of the pile foundation construction position, as for the concrete cast-in-place pile rectification method, the pile cap raft foundation superstructure is reinforced and improved, the number of rebars in a raft connected with a concrete cast-in-place pile cap is increased, and the added rebars are arranged in both directions on the upper surface and the lower surface of a raft foundation. The raft foundation cast-in-place pile construction method further solve the problem that groundwater or mud enters a sinking pipe during the construction of the sinking pipe cast-in-place pile, and the construction efficiency and quality are affected. According to the scheme of the raft foundation cast-in-place pile construction method, during the construction of the sinking pipe cast-in-place piles, dry concrete is replaced by pile boots. In addition, pre-drilling is implemented by adopting a spiral drill, and the normal implementation of sinking operation is ensured; a limiting rebar is connected to the outer side of the main reinforcement of the cast-in-place pile rebar cage to replace a concrete cushion block; and the main reinforcement at the top of the cast-in-place pile is bent to a straight section to improve the embedded effect of the pile cap in the raft foundation.

Description

technical field [0001] The invention relates to the field of pile foundation engineering, in particular to a method for correcting the deviation of the pile foundation construction position when the deviation is too large and a method for constructing cast-in-place piles for raft foundations. Background technique [0002] In the process of large-scale pile foundation construction, it is inevitable that the position of individual pile foundations will deviate beyond the scope specified in the specification. If the position deviation of the pile foundation is too large, the uneven force inside the raft will cause cracks in the internal concrete. And may develop into through cracks, causing damage to the raft structure. For example, the "Code for Acceptance of Construction Quality of Building Foundation Engineering" (GB20202-2002) has detailed and specific regulations on the allowable deviation position of concrete pouring piles. When the position deviation of the pile foundat...

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Problems solved by technology

This method is not suitable for weak and complex geology or the need to pass through the groundwater layer, because during the construction of the pile foundation, groundwater or muddy water will enter the immersed tube, which will affect the construction efficiency of the pile foundation and the construction quality of the pile foundation concrete

[0004] Second, when encountering soft plastic or hard plastic clay in the process of forming the tube, the vibration immersed tube cannot overcome the resistance, and the immersed tube will encounter difficulties

In addition, the phenomenon of ground uplift will occur when the extrusion pile group works

[0005] Third, according to the pile foundation specification, concrete pads or mortar pads are used to ensure that the pile foundation reinforcement has a sufficient protective layer. The problem of excessive deviation to the main diameter

The reason is that the contact area between the pile cap reinforcement and the raft concrete is not large, and the embedding effect of the pile cap is poor, which limits the ability of the pile cap to resist horizontal and vertical loads

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