Combined drilling bottom-enlarging pile-planting construction method

Abstract

The invention discloses a combined drilling bottom-enlarging pile-planting construction method. The combined drilling bottom-enlarging pile-planting construction method comprises the following steps:1) preparing before construction; 2) installing two groups of power head assemblies; 3) carrying out drilling cutting by the power head assemblies as well as drill rods, spiral drill rods and drill tools thereof; 4) rotating multi-section drill rods at the left sides of vertical columns to the left and connecting the multi-section drill rods with the power head assemblies and the lower-end drill rods; 5) continuing to carry out drilling cutting by the power head assemblies, the drill rods, the spiral drill rods and the drill tools; 6) carrying out bottom-enlarging working by the power head assemblies; 7) carrying out guniting and stirring working by the power head assemblies, the drill rods, the spiral drill rods and the drill tools; 8) lifting and detaching the drill rods and the drill tools; and 9) planting a precast pile. According to the combined drilling bottom-enlarging pile-planting construction method, accurate butting locking among the drill rods which are fixedly installed atthe lower ends of the power head assemblies is ensured through the rotation of the vertical columns, drilling and tunneling, stirring and reaming working are realized, the surface smoothness of the hole wall of the formed hole is improved, and frequent butting and detachment among the drill rods, and between the drill rods and the drill tools are avoided, so that the working intensity of operating personnel is reduced, the drilling pile-planting working efficiency is increased, the pile-planting construction quality is effectively ensured, and the purchase cost for equipment is lowered.

Description

technical field [0001] The invention relates to a construction method of drilling a hole, enlarging the bottom of the hole, implanting a prefabricated pile into the ground after grouting and stirring. Background technique [0002] In the process of continuous development of urban construction, land resources are becoming less and less, and housing construction is developing towards high-rise buildings. Therefore, high-rise and super high-rise buildings have higher and higher requirements for the bearing capacity of pile foundations, and the requirements for anti-settlement deformation of buildings are also increasing. Higher and higher, buildings (structures) have higher and higher requirements for pull-out and horizontal resistance. In order to meet the requirements of bearing capacity and control deformation, the existing technology often adopts deep and long pile foundations, but the construction of hammering or static pressure pipe piles often cannot meet the performance...

AI Technical Summary

Problems solved by technology

Therefore, in the two stages of running in and pulling out the drill, the operator needs to spend more time to connect and remove the drill pipe, which seriously affects the efficiency of pile planting; in addition, due to the grouting and mixing construction in the pre-drilled hole There is a certain time schedule requirement, too frequent drilling pipe and drilling tool connection procedures will affect the quality of prefabricated piles, and then reduce the technical performance of implanted piles

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