Precast expanding pile as well as construction method and construction mechanical equipment thereof

Abstract

The invention relates to a precast expanding pile as well as a construction method and construction mechanical equipment thereof in the field of pile foundation engineering. The construction method of the precast expanding pile of the invention comprises the following steps of: sedimentating a hollow precast pile (2) into a preset depth, wherein the bottom of the hollow precast pile (2) is connected with a pile plug (1); moving away the pile plug (1) and pouring an immature pile body material into the hollow precast pile (2); squeezing the immature pile body material into a soil body at the lower part of the hollow precast pile (2) to form a pile bottom expanding segment (4); and repeating the steps until the pile bottom expanding segment (4) satisfies the requirement. The precast expanding pile obtained through the construction comprises the hollow precast pile (2) at the upper part, the pile bottom expanding segment (4) at the lower part and the pile plug (1) at the bottom, and high-efficiency construction equipment is developed, the pile in the form is convenient to construct, has reliable quality, greatly improves the bearing capacity of the end parts of the precast piles, such as PHC (Prestress High Cement ) tubular pile, hollow square piles, and the like which are widely applied at present and can be used as an pulling and compression resistant bearing pile with high bearing capacity and low manufacture cost.

Description

technical field [0001] The invention relates to the field of pile foundation engineering in civil engineering. Background technique [0002] Pile foundation engineering is one of the important components in the field of civil engineering. At present, the commonly used engineering pile forms mainly include prefabricated piles and cast-in-situ piles. Prefabricated piles include steel pipe piles, prefabricated square piles, PHC pipe piles, prestressed hollow Square piles and other forms, which are characterized by prefabricating engineering piles and placing them into the soil, and using the joint action of piles and soil to provide compression, pullout, bending or horizontal bearing capacity. Cast-in-place piles include bored piles, cast-in-place piles and other forms, which are characterized by pre-forming holes in the rock and soil, and then pouring pile materials into piles. Due to the high strength of the bearing layer at the pile tip or part of the soil layer at the side...

AI Technical Summary

Problems solved by technology

However, the shape of the prefabricated pile has been determined before being placed in the soil. Whether the bottom of the prefabricated pile can be enlarged to improve the bearing capacity of the prefabricated pile has great engineering practical significance. The method is the expanded bottom pile completed by the construction method of sinking the pipe first and then pressing into the prefabricated pile body. However, this method has the disadvantages of complicated construction technology, high cost, and difficulty in controlling the quality of on-site construction. The method of force is to increase the bearing capacity of prefabricated piles through grouting at the bottom and side of piles. Since the prefabricated piles have been tightly connected with the soil by squeezing the soil after construction, the bearing capacity increased by this method is small and the cost is high. Therefore, it is currently efficient The prefabricated pile reaming technology is still a blank at home and abroad

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