Vibrating piling-hammer sink-pull steel protective-cylinder piling method and special steel protective cylinder

Abstract

This invention discloses a method for piling including 1, sinking a steel fender drum, 2, holing, 3, pulling up the steel fender drum. After the concrete is filled, a vibration hummer is used to pull the steel fender up first and then stops working when a hoist can pull up the steel fender directly. This invented fender drum is composed of at least two sections of drum units, connection ears are distributed on the outside walls of both ends and those on the two adjacent units are symmetric and connected by bolts.

Description

technical field [0001] The invention relates to a pile foundation construction technology, in particular to a method for forming a pile by sinking and pulling out a steel casing with a vibrating piling hammer. Background technique [0002] In construction, bored piles are commonly used foundation forms. In the construction of bored piles, when encountering huge thick soft plastic, flow plastic and sensitive strata, it is generally necessary to lower the steel casing to isolate the weak stratum in order to safely drill into the hole. At present, high-efficiency drilling machines such as rotary drilling rigs have been widely used in the field of pile foundation construction, and more and more have entered the areas of extremely thick soft plastic and flow plastic. Due to the soft ground, the design pile length is relatively deep, and the rotary drilling hole has no circulating mud retaining wall, so a deep steel casing needs to be installed to meet the hole forming requiremen...

AI Technical Summary

Problems solved by technology

However, there are also some disadvantages: one is that the drilling rig is used to insert and pull out the steel casing, and the drilling rig must be equipped with a special swinging device. The attached swinging device affects the flexibility of the drilling rig and brings inconvenience to the operation of the drilling rig. At the same time, it takes up working time, affects the efficiency of hole formation, and cannot realize the drilling construction flow operation; secondly, the steel casing needs to use special materials and special processing, which increases the production and construction costs; thirdly, after the concrete pouring is completed, the drilling machine is pulled out During the steel casing process, the steel casing rotates and twists in a certain angle range, which will have a negative impact on the concrete of the pile body; Fourth, the sinking depth and speed of the steel casing are limited by the output torque of the drilling rig

The existence of the above defects has affected the application of bored pile construction technology

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