Pile-forming method of cast-in-place pile with internal ramming and enlarging sinking pipe in deep clay stratum

Abstract

The invention discloses a pile forming method of an internal ramming enlarged sinking pipe cast-in-place pile in a deep clay layer, in particular to a pile forming method of the internal ramming enlarged sinking pipe cast-in-place pile in the field of building foundation construction in the deep clay layer. The pile forming method of the internal ramming and expanding cast-in-place pile in the deep clay layer comprises the following steps: A, placing the pile tube on the set pile position; B, setting the pile tube on the set pile position; B, completely seal that end of the outer pipe with a pile shoe; C, hammering that inn pipe and the outer pipe together to sink to the set depth in the clay layer; D, lifting that inner pipe, adding dry bricks into the outer pipe, lowering the inn pipe and ramming; E, inject dry hard concrete, lowering inn pipe and ramming; F, lower that reinforcing bar cage; G, pour that pile shaft or lowering the precast pile shaft; H, pull off outer tube. The invention can be constructed under the condition of deep and thick clay deposition environment, and can effectively avoid the adverse conditions such as pile pipe rebound, mud in the pipe and the like, andcan effectively guarantee the construction progress, pile forming quality and pile body quality.

Description

technical field [0001] The invention relates to a method for forming an internally rammed and expanded sinking pipe cast-in-place pile in a deep clay layer, in particular to a method for forming an internally rammed and expanded sinking pipe cast-in-place pile in a deep clay layer, which relates to the field of building foundation construction. Background technique [0002] In order to increase the bearing capacity of the pile end of the poured concrete pile, the bottom of the pile is often expanded to form an enlarged head, and there are many types of bottom expansion techniques. Among them, the construction method of internally rammed and expanded sinking tube grouting pile is to sink the pile tube into the soil layer to the design elevation, and then put gravel, pebbles, and (or) dry hard concrete and other solid fillers into the pile tube to ram the pile tube. The bottom end forms an enlarged end portion, and then piles are poured on it to form piles. Because of its low...

AI Technical Summary

Problems solved by technology

[0005] The existing rammed and expanded pile construction technology can only be applied to non-cohesive soil layers or shallow cohesive soil layers (less than 20m) in thickness, but when encountering deep and thick cohesive soils, due to the high resilience of cohesive soils, when When tamping the enlarged head material, there are often unfavorable conditions such as pile pipe rebound and mud entering the pipe, which directly affect the construction progress and pile quality, and may even cause the enlarged head to fail to form.

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