Threaded post-spinning reinforced concrete pile

Abstract

The invention relates to a threaded screwing inserting bar compaction filling pile, which comprises a fine threaded steel mold pipe, wherein a guide pipe for pumping concrete is inserted in the fine threaded steel mold pipe, the fine threaded steel mold pipe is connected with a rock-socketed drill bit, and the rock-socketed drill bit is formed by combining a drill bit point at the lower end, a drill bit body at the upper part and a trapezoidal threaded short pipe; a joint element is arranged between the drill bit point and the drill bit body, the drill bit body is fixedly connected with the trapezoidal threaded short pipe, the lower end of the guide pipe is inserted in the trapezoidal threaded short pipe and the drill bit body, the upper part of the drill bit point is connected with a hanging rod provided with a top groove, a first bearing plate is inserted in the top groove, the first bearing plate is welded into a whole with the hanging rod, the lower end of the guide plate is provided with a groove opening allowing a second bearing plate to be inserted in, and the second bearing plate is positioned in an inner cavity of the drill bit body. The threaded screwing inserting bar compaction filling pile has the advantages that a high rock-socketed function is realized, the filling pile is completely applicable to the foundation engineering under the hill foundation geological conditions, and in addition, the pile forming efficiency is higher.

Description

technical field [0001] The present invention relates to a pile foundation of civil construction engineering, in particular to the post-spinning of the thread in the foundation engineering of the geological conditions composed of rock strata with different degrees of weathering in a hill foundation stratum mainly composed of gravel, pebbles and crushed stones. Inserting reinforcement and compacting cast-in-place piles. Background technique [0002] With the rapid process of national construction and urbanization, in order to ensure the limited land resources of the plains, the construction land is transferred from the good land and good soil of the plains to the wastelands that are difficult to cultivate in the hills, and the foundations of the hills are mainly composed of gravel, pebbles, and crushed land. The pile foundation project constructed under the geological conditions of the hill cannot adopt the existing conventional pile type for plain construction; for example, p...

AI Technical Summary

Problems solved by technology

[0003] And what is mentioned in the applicant's invention patent No. ZL201110458993.3 "Soil-squeezing reinforced concrete screw pile pile-forming device and pile-forming method" is a soil-squeezing screw pile, wherein the outlet of the pumped concrete flows out to open the door cover, It was pulled up and collided with the rock wall in the forward rotation, and the door cover fell off, which affected the efficiency of pile formation, and did not have the function of rock insertion, so it cannot be applied to the foundation engineering of the geological conditions of the hilly ground.

[0004] The invention patent No. ZL200710063983.3 of China Metallurgical Construction Research Institute Co., Ltd. "Two-way Spiral Extrusion and Expansion Pile" adopts the improvement of German Bauer technology. The downward direction is positive thread and the upward direction is negative thread. During construction, the soil mass brought out of the pile hole is pressed back into the pile hole by the reverse thread to achieve the effect of vertically compacting the soil layer; The ability of the shuttle-shaped drill bit to pass through the soil layer of the hilly foundation is small, and it does not have the function of rock insertion, so it cannot be applied to the foundation engineering of the geological conditions of the hilly foundation.

[0005] There is also a long spiral cast-in-place pile in the existing similar pile-forming method. Due to the large diameter of the screw blade of the long spiral and the small diameter of the drill pipe, the screw blade drives the soil volume in the pile hole to be too large when the screw blade is pulled up. Large, and the deformation of the screw blade is serious, which seriously affects the pile diameter size and soil squeezing effect of the pile, and does not have the rock-socketing ability

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