Collapsible loess compaction pile construction device and method capable of reducing thickness of falling soil

Abstract

The invention provides a collapsible loess compaction pile construction device and method capable of reducing the thickness of falling soil. The collapsible loess compaction pile construction device comprises a hammering device and a hole forming pile pipe. A grouting hole is formed in the position, lower than a hammering protective sleeve, of the upper end of the hole forming pile pipe, and the length of a pipe body below the grouting hole is equal to or larger than the depth of pile holes. A plurality of grout spraying holes are formed in the positions, higher than an expansion ring, of the lower end of the hole forming pile pipe. The construction process of a compaction pile comprises the steps that after pile hole construction is completed by hammering the sinking pipe, the grouting hole is connected with a grouting pump, grout spraying operation is uniformly conducted on the walls of the pile holes through the grout spraying holes in the wall of the hole forming pile pipe in the pipe pulling process, the inner wall surfaces of the pile holes are cured, and filling work is conducted after curing. According to the collapsible loess compaction pile construction device and method capable of reducing the thickness of the falling soil, construction is easy, the quantity of the falling soil on the hole walls is decreased through curing of the hole wall surfaces, the situation that layered compaction of plain soil / lime soil subsequently is affected due to the fact that the falling soil is thick in the hole forming process is avoided, the pile hole depth is also ensured, and the construction progress and the construction quality are improved.

Description

technical field [0001] The patent of the invention belongs to the field of foundation treatment in collapsible loess areas, and relates to a construction device and construction method for collapsible loess compaction piles that reduce the thickness of fall-back soil. Background technique [0002] Collapsible loess is a special kind of soil. Under a certain pressure, after sinking and being wetted by water, the soil structure is quickly destroyed and significant additional subsidence occurs. Therefore, construction is carried out on collapsible loess sites. , while satisfying the bearing capacity of the foundation, it is also necessary to consider the possibility of the foundation being wetted by water and the strictness of uneven settlement restrictions during the reuse period to select the appropriate foundation treatment method to prevent the foundation from collapsing and causing damage to the building. [0003] At present, the mature and widely used treatment methods ar...

AI Technical Summary

Problems solved by technology

Existing compaction piles will continuously scrape off the surface soil on the inner wall of the pile hole during the hole forming process and the subsequent pile tube lifting process, resulting in a lot of fall-back soil in the pile hole, which increases the number of subsequent repetitions. Digging operation, and the thickness of the falling soil is relatively large, will also cause the length of the pile to fall short of the design requirements, the compactness cannot meet the requirements, and the collapsibility of the loess cannot be well eliminated, which will affect the construction quality of the foundation treatment

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