Large-diameter full-section squeezing and expanding cast-in-place pile equipment and construction process

Abstract

The invention discloses large-diameter full-section squeezing and expanding cast-in-place pile equipment which comprises a rotary drilling rig, the bottom of a drill rod of the rotary drilling rig is connected with a squeezing and expanding drill bit and a rotary drilling bit, the squeezing and expanding drill bit is provided with a shell, the whole shell is in a big-end-up circular truncated cone shape, and the shell of the squeezing and expanding drill bit is in running fit with the drill rod through a first running fit structure; a plurality of squeezing and expanding vertical holes are evenly formed in the side wall of a shell of the squeezing and expanding drill bit in the circumferential direction and extend downwards from the top of the side wall of the shell of the squeezing and expanding drill bit to the bottom end of the side wall of the shell. Squeezing and expanding mechanisms corresponding to the multiple squeezing and expanding vertical holes are arranged in the shell. The invention further discloses a corresponding construction process which comprises the following steps: connecting the rotary excavating drill bit and the extruding and expanding drill bit together, and performing vertical full-section extruding and expanding hole forming; and the squeezing and expanding action and the rotating action are separated, so that the required torque is greatly reduced, and the requirement on the strength of equipment materials is also greatly reduced.

Description

technical field [0001] The invention relates to the field of foundation engineering construction, in particular to large-diameter full-section extruding and expanding cast-in-place pile equipment and construction technology. Background technique [0002] Cast-in-place piles can be divided into a large number of extruded soil piles (such as immersed pipe cast-in-place piles, screw extruded soil extruded cast-in-place piles), a small amount of soil extruded piles (such as extruded and expanded branch cast-in-place piles) and non-extruded soil piles ( Such as manual digging, drilling, punching and digging into holes). [0003] The construction technology of non-squeezing soil-forming concrete cast-in-place piles by rotary drilling and drilling holes has been widely used in foundation engineering, but in compressible rock strata such as fill, clay silt, loess, etc., especially when the depth of groundwater is shallow, It is prone to quality problems such as hole collapse, necki...

AI Technical Summary

Problems solved by technology

This construction method not only requires additional power equipment, but also has a large time difference between the rotary excavation operation and the extrusion and expansion operation. Therefore, it is necessary to carry out mud protection for the drilled part of the rotary excavation to prevent the hole from collapsing. The process is shortened, the construction efficiency is reduced, the construction cost is increased, and it also brings pollution

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