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

Abstract

The invention relates to a construction device of a pile peripheral cemented soil cast-in-place stiffness core pile. The construction device is mainly composed of an inner immersed tube, an outer immersed tube, a precast pile toe and high-pressure guniting tubes. An outer immersed tube limiting groove, an inner immersed tube limiting groove, supporting baffle embedded grooves and torsion-resistance limiting steel plates which are used for positioning an upper portion immersed tube device are arranged on the upper surface of the precast pile toe. Hole channels which allow the high-pressure guniting tubes to pass are pre-formed inside the precast pile toe. The high-pressure guniting tubes which are provided with spraying heads at the bottom ends are evenly distributed on the outer side wall of the inner immersed tube in the circumferential direction. The two sides of each high-pressure guniting tube are respectively provided with a vertical through long supporting baffle. Stiffening ribbed plates are arranged on the outer sides of the supporting baffles in a uniformly-spaced mode. By the adoption of the construction device, the stiffness core pile can be formed inside the immersed tubes, cemented soil is formed at the periphery of the pile, the stress performance of pile body materials is brought into full play as much as possible, in the rotation sinking process of the device, high-pressure guniting is carried out on a lower portion soil body, end portion resistance and side frictional resistance can be reduced, and the sinking speed of the immersed tubes is improved. The invention further 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

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