Construction method of concrete pile

Abstract

The invention aims at providing a construction method of a concrete pile. A compound carrier is formed below a pile end by adopting a tailored inner tamping tube and an outer tube as well as taking a diesel oil hammer as the power and repeatedly tamping and closely extruding filler. A soil body at the pile end can be fully transferred to be stressed, so that the loading capacity of the pile can be greatly improved. The construction method comprises the following steps: (1) inserting the tailored inner tamping tube into the outer tube; (2) simultaneously striking the outer tube and the inner tamping tube by using the diesel oil hammer to downward sink until the design depth; (3) filling dispersion filler to the bottom end of the outer tube and tamping the filled dispersion filler by striking the inner tamping tube through the diesel oil hammer; (4) repeatedly carrying out filling, striking and tamping operations until forming the optimal closely-extruding soil body required to meet the penetration design value; (5) gradually filling hard concrete to the bottom end of the outer tube and tamping the inner tamping tube by the striking of the diesel oil hammer; (6) constructing a pile body; and (7) extracting the outer tube.

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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