Method for forming holes of square and rectangular cast-in place piles

Abstract

The invention provides a method for forming holes of square and rectangular cast-in place piles. The method comprises the following steps of: determining the size of a way-type drilling unit and the diameter of a pilot hole according to the cross section dimensions of the square and rectangular cast-in place piles, wherein the depth of the pilot hole is equal to the depth of a designed pile; constructing the pilot hole by adopting an engineering driller or a rotary drilling rig according to the pilot hole diameter determined in the last step; inserting and placing a reverse circulation spraying conduit and the way-type drilling unit determined in the first step along the center of the dug pilot hole; and finishing the hole forming of the square and rectangular cast-in place piles at a time by adopting a hole forming trolley. The method has the advantages that on the premise of finishing the pilot hole, the hole forming work of the square and rectangular cast-in place piles is finished at a time, thus the hole forming quality and the verticality are obviously improved; and a hole forming cross section type has larger bending modulus compared with a traditional cross section, thereby saving the wall protection slurry and realizing the win-win-win of the work efficiency, the quality and the cost.

Description

technical field [0001] The invention relates to a method for forming holes in cast-in-situ piles, in particular to a method for drilling holes in cast-in-situ piles with square or rectangular holes. Background technique [0002] With the rapid development of the reform and opening up of the national economy, domestic ports have built large deep-water berths to meet the requirements of large-scale ships. Tangshan Port is a model of building a port on a silty coast based on an underground continuous wall sheet pile wharf. As one of the three major types of wharf structure, the sheet pile wharf structure has encountered extreme difficulties in the process of deep water and large-scale wharf. The biggest difficulty is that the section of the sheet pile cannot meet the sharply increased bending moment requirements of the deep-water wharf. [0003] Common traditional methods include: [0004] 1. Conduit gas lift reverse circulation trough forming method [0005] The traditional...

AI Technical Summary

Problems solved by technology

The hole forming efficiency is high, but the practical application is greatly limited:

[0011] ① High stand-alone cost: Compared with the stand-alone cost, the actual efficiency results in higher construction costs and higher construction costs

[0012] ② Poor adaptability: The section of the pile varies with the force of the structure and the layout of the plane, and the grab must be matched with it

Due to the complex processing and high processing cost of the hydraulic grab bucket body, it is poor to adapt to the change of pile section

[0013] ③If the pile section is small, it is difficult to carry out single-bucket grabbing

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