Sand pile construction method adopting multi-section composite casing punching

Abstract

The invention discloses a sand pile construction method adopting multi-section composite casing punching. The construction method comprises the following steps that (1), a composite casing is vertically positioned; (2), the composite casing is hammered; (3), an inner pipe is raised and sand is poured into an outer pipe; (4), the inner pipe and the outer pipe are made to be flush; (5), the composite casing is hammered to compact the filling sand; and 6), the steps mentioned above are repeated till a pile pipe is pulled out of the ground. The method is standard in operation, the sand content andsilt content of the filler are strictly controlled, and the influence caused by hole collapse and the insufficient filler on quality is effectively avoided. Pile driving equipment adopts a vibrationpile driver to set up the composite steel casing and has a relatively mature safety system, and the safe construction can be effectively guaranteed. During pile sinking, the composite casing is used to form the outer pipe retaining wall, and the surrounding soil does not enter a pile body during the vibration extrusion process; and meanwhile the sand pile filler can be repeatedly extruded by usinga multi-section type punching construction method to ensure the compactness of the whole pile body, and the construction quality of a sand pile is ensured.

Description

technical field [0001] The invention relates to a construction method of a multi-segment composite casing stamping sand pile, which belongs to the technical field of building construction. Background technique [0002] The geological conditions in the northern part of Shandong Province are mostly miscellaneous filling soil layer, silt layer, silty clay layer, medium-coarse sand layer, gravel sand layer, etc., and the lower part is stable weathered rock. At the same time, due to the high groundwater level in some areas, the foundation Although large-area replacement can solve the problem of foundation bearing capacity, the cost of foundation replacement greatly reduces the utilization rate of this process. Therefore, the use of sand piles in construction can effectively accommodate the problem of foundation bearing capacity and cost. [0003] During the construction of projects that require the use of sand piles, due to the poor surrounding soil conditions, the surrounding so...

AI Technical Summary

Problems solved by technology

[0003] During the construction of projects that require the use of sand piles, due to the poor surrounding soil conditions, the surrounding soil is easy to loosen and collapse when the pile pipe is pulled out by vibration, and the pile body becomes a broken pile, which has a large quality hidden danger, which makes it more difficult to form holes. Large, the pile quality cannot be guaranteed, and it is difficult to maintain the design bearing capacity of the sand pile