Device for increasing rock-socketed depth of large-diameter cast-in-place pile

Abstract

The invention belongs to the technical field of geotechnical engineering foundation pit supporting and construction, and relates to a device for increasing the rock-socketed depth of a large-diameter cast-in-place pile. A positioning sleeve is bound and fixed to the inner side wall of a reinforcement cage through fixing steel bars, a miniature steel pipe pile is in lap joint in the positioning sleeve, and the end face of one side flange of ballasting I-shaped steel makes contact with the top of the reinforcement cage; the anchoring angle steel, the connecting rings, the steel wire ropes and the connecting plates form ground anchoring components, the ground anchoring components are arranged at the two ends of the ballasting I-shaped steel, cement mortar is injected into a pile body of the miniature steel pipe pile, and the rock-socketed part of the miniature steel pipe pile is tightly bonded with pore-forming rock through the cement mortar. The inner wall part of the lap joint positioning sleeve of the miniature steel pipe pile is bonded through cement mortar; the outer wall of the positioning sleeve and the large-diameter cast-in-place pile are cast into a whole; the device is simple in structure and convenient and safe to operate, accurate drilling and pile sinking of a rock stratum can be achieved, the embedding depth is guaranteed, the reinforcement cage is prevented from floating upwards in the pressure grouting process, construction is convenient and fast, and cost is saved.

Description

technical field [0001] The invention belongs to the technical field of foundation pit support and construction in geotechnical engineering, and relates to a device for increasing the rock-socketing depth of large-diameter cast-in-situ piles, which can effectively increase the rock-socketed depth of the cast-in-situ piles when constructing large-diameter cast-in-place piles in hard rock formations. Background technique [0002] In recent years, advanced micro-steel pipe piles have good site adaptability, light weight, high bearing capacity, good penetration, flexible pile position layout, small construction machinery, small disturbance to the reinforced ground, small construction vibration, and strong penetration. , The construction speed is fast, and the depth of foundation pit support is relatively large. Compared with cast-in-situ piles and traditional steel pipe piles, it has obvious advantages in economic benefits. Large-diameter cast-in-situ piles have been widely used ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and seek a device for increasing the rock-socketing depth of large-diameter cast-in-place piles for soil-bearing rock-combined strata. The reinforcement cage with positioning sleeves has been installed, and the rock-socketed part is precisely positioned and drilled through the fixed positioning sleeves, the micro-steel pipe piles are lowered, and the top of the reinforcement cage in the large-diameter cast-in-place pile is connected with the weight I-beam. The beam is anchored to a certain depth in the surrounding soil layer through ground anchoring components, which is used to solve the problems of large-diameter cast-in-place piles, such as difficulty in entering the rock, positioning deviation, and floating of the steel cage during pressure grouting, etc., to achieve precise positioning of large-diameter cast-in-place piles and ensure rock-socketing depth, reduce the disturbance to the buildings around the overlying soil layer, facilitate construction, and save costs

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