Construction device and method of pile peripheral cemented soil cast-in-place stiffness core pile

Abstract

The invention relates to a construction device for cement-soil cast-in-situ core piles around piles. The construction device is mainly composed of an inner sinking tube, an outer sinking tube, a prefabricated pile tip and a high-pressure grouting tube; the upper surface of the prefabricated pile tip is provided with Locate the outer immersion tube limit groove, inner immersion tube limit groove, support baffle embedded groove and torsional limit steel plate of the upper immersed tube device, and the prefabricated pile tip is preset with a hole for the high-pressure spray pipe to pass through; the inner immersion The outer wall of the pipe is uniformly arranged with high-pressure spray pipes with nozzles at the bottom; both sides of the high-pressure spray pipes are provided with vertical through-length support baffles, and stiffening ribs are arranged at equal intervals outside the support baffles. The use of the construction device of the present invention can form core piles in the sinking tube, and form cement soil around the piles, so as to maximize the mechanical properties of the pile materials; during the rotation and sinking of the device, the high-pressure spraying of the lower soil body can reduce the Internal resistance, side friction resistance, and increase the sinking speed of the immersed tube. The invention also discloses a pile-forming construction method of the construction device.

Description

technical field [0001] The invention relates to a core pile construction device, in particular to a prefabricated pile tip and an inner sinking tube that can be rotated at the same time, and the soil is sprayed and punched to cut the soil. During the sinking process of the device, cement and soil around the pile are basically formed, and the core is poured into the sinking tube. The pile is a construction device of a recyclable cement-soil cast-in-place core pile around the pile. It belongs to the field of foundation treatment and is suitable for foundation treatment projects with high requirements on the bearing capacity of building foundations. Background technique [0002] While the rapid growth of the world economy is promoting the rise and development of high-rise buildings and large-scale industrial buildings, the requirements for the bearing capacity and deformation resistance of building foundations are getting higher and higher. For buildings with large superstructu...

AI Technical Summary

Problems solved by technology

The above-mentioned methods are to construct the cement-soil (flexible body) and the core pile (rigid body) around the pile in different periods, and the cement-soil mixing pile will be forcibly inserted by the prefabricated pile after the initial setting time, causing the pile body to be damaged. The piles that have been constructed are forced into the prefabricated piles, and the soil extrusion effect damages the finished piles, and the prefabricated piles inserted beyond the initial setting time cannot be tightly combined with the cement-soil mixing piles, resulting in ineffective transmission of loads, etc.

[0006] In addition, there is also a certain degree of instability in the formation of cement soil around the pile by the common application of deep mixing method, mainly reflected in: the drilling or lifting speed of the mixer is too fast, and the speed of the slurry supply system is not coordinated or the number of mixing is not enough. The amount of cement is insufficient or uneven; the cement supply system is not perfect, the time control of the feeding process is not accurate, and whether the cement is input into the soil is not clear, resulting in broken piles or shortages; the wear of the mixing blades makes the pile diameter insufficient, and the mixing is insufficient. Causes uneven mixing, reduced mixing amount, and reduced effect of soil reinforcement

[0007] In summary, although the existing pile construction devices have achieved relatively ideal foundation treatment effects under suitable engineering conditions, they are still ineffective in terms of construction efficiency, concrete bonding of different ages, and reduction of mutual interference between piles. room for improvement

Images