Continuous multi-shaft cement mixing pile device and construction method

Abstract

The invention relates to a continuous multi-shaft cement mixing pile device and a construction method; the multi-shaft continuous cement mixing pile device comprises a walking type main machine, a crawler type main machine, a winding engine, a guide rod, a steel wire rope, an air and grout inlet, a power head, a speed changing box, a reduction box, drill stems, middle supporting frames, lower supporting frames, winged drill stems, hoops, drill bits, air injection ports, grout spraying ports and a background cement grout stirring system, wherein the winding engine and the guide rod are fixed on the main machines, the power head is connected with a pulley arranged at the top end of the guide rod through the steel wire rope; the steel wire rope drives the power head to be lifted up and down; the power head is sequentially connected with the multiple drill stems through the speed changing box and the speed reducer; the middle supporting frames are arranged in the middle parts of the multiple drill stems; the lower supporting frames are arranged at the lower parts of the multiple drill stems; the winged drill stems are connected with the lower ends of the drill stems; the hoops are arranged on the winged drill stems; the drill bits are connected with the lower end of the winged drill stems; and the air injection ports and the grout spraying ports are arranged on the drill bits. Compared with the prior art, the continuous multi-shaft cement mixing pile device has the advantages of noiselessness, non vibration, ensured safety and quality, cost reduction, high efficiency, shortened construction period and the like.

Description

technical field [0001] The invention relates to a multi-axis cement-soil continuous mixing pile device and a construction method, which are mainly used in foundation pit enclosure, water stop and foundation reinforcement in civil and industrial infrastructure construction. Background technique [0002] At present, two-axis mixing piles and SMW construction methods are mostly used for foundation pit enclosure and foundation reinforcement. [0003] The two-axis mixing pile is a construction method extended in the 1980s. The frame is a well-shaped frame, which walks in a tube, has extremely poor stability, low work efficiency, and high labor intensity. In addition, the power head part uses a 37kw conventional motor, and the starting power is insufficient. . The deepest pile is only 18m long, and the lower part of the drill pipe has only two blades. The mixing is not uniform, and the quality of the lower part of the pile is difficult to guarantee. Each pile is 1.2 meters long, ...

AI Technical Summary

Problems solved by technology

[0003] The two-axis mixing pile is a construction method extended in the 1980s. The frame is a well-shaped frame, which walks in a tube, has extremely poor stability, low work efficiency, and high labor intensity. In addition, the power head part uses a 37kw conventional motor, and the starting power is insufficient.

The deepest pile is only 18m long, and the lower drill pipe has only two blades, so the mixing is not uniform, and the quality of the lower pile is difficult to guarantee. Each pile is 1.2 meters long, resulting in many overlapping cold joints, which is easy to cause water leakage and other phenomena

[0004] The disadvantage of the SMW construction method is that the cement seepage is 20%, and the water-cement ratio is 1.5-2.0 to form a pile. Due to the increase of the water-cement ratio, in order to ensure the strength of the cement, the amount of cement can only be increased

The amount of cement is large, and one-third of the soil is replaced. The soil contains cement slurry, which cannot be used as farming soil and greening soil. It can only be treated as dregs, which not only wastes materials, but also pollutes the environment, and the cost is high.

Two-axis and three-axis mixing piles are inserted with H-shaped steel and bored piles are used to retain soil on the inner wall. The cost is high and the waste of materials is serious.

Images