Construction method of concrete pile

Abstract

The invention aims at providing a construction method of a concrete pile. An inner tamping pipe fills materials to tamp continuously outside the bottom end of an outer pipe. The filled materials are dispersed materials, thus effectively forming a composite carrier, fully arousing pile end soil to take part in force and greatly raising the bearing ability of the pile. The construction method comprises the following procedures: 1) the outer pipe is led to be sheathed and overlapped with the inner tamping pipe at the pile position; 2) the outer pipe and the inner ramming pipe are struck to be plunged downwards into the designed depth by a diesel hammer; 3) the inner tamping pipe is stuck to be from the bottom end of the outer pipe for a certain distance by the diesel hammer; 4) dispersed materials is filled into the bottom end of the of the outer pipe; the filled dispersed materials is struck by the diesel hammer to the inner tamping pipe; filling materials and tamping repeatedly are carried out until the optimal squeezed dense soil is formed, thus meeting the demand of the ten-strike penetration degree designed value; 5) concrete with stiff consistency is filled to the bottom end of the outer pipe in division order and tamping is carried out by the diesel hammer for striking the inner tamping pipe; 6) construction is executed to a pile body.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to the construction technology of piles. Background technique [0002] The rammed and expanded pile is a kind of pile type currently used in my country. It adopts rammed and expanded methods (one time, two times, multiple times of rammed expansion, etc.) to expand the cast-in-place concrete at the pile end into a large head shape, so as to increase the bearing area of ​​the pile end. Thereby increasing the pile end resistance. However, there are also some shortcomings and limitations in the rammed and expanded piles. For example, it is difficult to ensure and determine the opening of the expanded head. Since the rammed and expanded is wet concrete, and it is squeezed and expanded in the inner tube, it is difficult to expand. In particular, the purpose of tamping and expanding piles is to increase the load-bearing area of ​​the pile tip. When the wet concrete is squeezed and expanded...

AI Technical Summary

Problems solved by technology

However, there are also some shortcomings and limitations in the rammed and expanded piles. For example, it is difficult to guarantee and determine the opening of the expanded head. Since the rammed and expanded is wet concrete, and it is squeezed and expanded in the inner tube, it is difficult to expand.

In particular, the purpose of tamping and expanding piles is to increase the load-bearing area of ​​the pile tip. When the wet concrete is squeezed and expanded, although there will be some compaction of the bearing layer at the pile tip, the effect is not obvious, and the soil around the pile tip is not fully mobilized. Therefore, although the bearing capacity of the pile has been improved, there is no essential change. When the shallow part of the soil layer has a better bearing layer and the bearing capacity of a single pile is high, there is no application advantage for the rammed and expanded pile.

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