Hole drilling mudjack pile construction method

Abstract

A high pressure bored pile construction method of the invention belongs to the foundation piling technical field, which comprises: a drilling rig is positioned to drill a hole downward and mud protection is provided; after drilling to a required depth, using clear water for cleaning the hole; lifting a drill rod and dissembling the drill bit and inserting a reinforcement cage as soon as possible and lengthening the drill rod to the end of the hole for first hole bottom grouting; after the grouting, continuously throwing stones while in the drilling status of the drill rod; after stones are thrown in, processing the secondary hole bottom grouting and adopting concrete insertion type vibration rod for pounding to 0.6 to 1.2 m under the hole edge to ensure a dense pile top. The pile body of the invention is of concrete with no sand, has high vertical bearing ability and lateral force resistance ability. The method needs relative small construction equipment and has little construction vibration and noise, needs small construction field, can convert the foundation extension construction into the foundation extension pile construction, greatly improves vertical bearing ability of each pile, and also can process the inclined pile construction.

Description

technical field [0001] The invention belongs to the technical field of foundation piling methods, and in particular relates to a piling method for bored grouting piles. Background technique [0002] In the 1980s and 1990s, due to its wide applicability, flexible structure, low cost, and simple construction, tree root piles have been widely used in soft soil foundation reinforcement projects in coastal areas such as Zhejiang. , there are still some engineering projects using tree root pile type as the pile type of composite foundation. However, due to the difficulty in controlling the construction quality of its own existence, many engineering quality problems occurred in the construction of tree root pile engineering projects. Combined with the conventional construction technology and construction management methods of tree root piles, the main reasons for the quality problems during the construction of tree root piles are as follows: (1) The construction methods of tree ro...

AI Technical Summary

Problems solved by technology

However, due to the difficulty in controlling the construction quality of its own existence, many engineering quality problems occurred in the construction of tree root pile engineering projects.

Combined with the conventional construction technology and construction management methods of tree root piles, the main reasons for the quality problems during the construction of tree root piles are as follows: (1) The construction methods of tree root piles are relatively simple, and the requirements for construction machinery are not high; (2) In the construction of tree root piles, the pursuit of construction progress and economic benefits is often too high, which makes it difficult to construct the construction quality according to the specifications; (3) The traditional tree root piles are carried out according to the technological process of forming holes → placing steel cages → putting stones → grouting construction

Among them, the grouting pipe (commonly used PVC pipe) is preset when the steel cage is lowered. After the stones are lowered, the grouting pressure is 0.1-0.3MPa. When the particle size of the stones and the grouting pressure are not well controlled, it is difficult to ensure the compactness of the grouting in the hole