Auxiliary hole-guiding method facilitating driving of hard-rock-layer steel plate pile

Abstract

The invention discloses an auxiliary hole-guiding method facilitating driving of a hard-rock-layer steel plate pile. When guiding holes are manufactured, a down hole hammer is adopted for impacting, and force acts on a soil body skeleton composed of soil solid particles and void water to compel a soil body to be reduced in porosity and increased in density, so that an undisturbed structure of a soil layer is effectively destroyed, the soil layer around the hole walls is densely squeezed, strong cohesive force and adsorption force are formed, and soil physical and mechanical properties are improved. Through cooperation of self-rotation of the down hole hammer, stone chips can be effectively discharged and shaken off, and low efficiency caused by stone soil chips secondary stamping is avoided, namely, finally the hole-forming quality of the guiding holes is good, and the steel plate pipe pile can be quickly and efficiently installed. The auxiliary hole-guiding method facilitating driving of the hard-rock-layer steel plate pile is applied to the field of cofferdam engineering.

Description

technical field [0001] The invention relates to the field of cofferdam engineering, in particular to a method for making auxiliary citations in hard rock formations before driving steel sheet piles. Background technique [0002] Temporary cofferdam construction is often required for temporary laying of artificial islands, municipal engineering, underground tunnels and large pipelines, and retaining soil, water and sand walls during trench excavation. Common types of cofferdams include vegetation cofferdams, cement mortar cofferdams, bamboo / wooden cage cofferdams, steel sheet pile cofferdams, and concrete cofferdams. [0003] In recent years, steel sheet piles have been widely used in the construction of temporary cofferdams due to their many advantages. The reasons are as follows: 1. The construction is simple and there is no need to prepare large-scale construction equipment; 2. It can be constructed quickly and the cycle can be greatly shortened; When changing, as long as...

AI Technical Summary

Problems solved by technology

[0004] Although the steel sheet pile has the above advantages, it is difficult to drive the steel sheet pile into the hard rock formation, especially in the site where the rock formation is shallow or the karst cave is developed, the required depth of the cofferdam entering the formation cannot be reached, and the use is limited.

Images