Construction method for concrete piles

Abstract

The invention aims to provide a construction method for concrete piles. The concrete piles with both higher compression bearing capacity and higher pulling resistance can be rapidly, simply and conveniently formed through the method. The construction method comprises the following steps of: 1), sinking outer tubes to projected depth; 2), respectively putting inner pounders in the outer tubes and knocking out the outer tubes; 3), filling in dispersed stuffing batch by batch and squeezing; 4), filling in harsh concrete batch by batch and squeezing; 5), laying up reinforcement cages of which the bottom parts are respectively provided with main reinforcements; 6), respectively putting inner tubes in the reinforcement cages, and respectively putting inner pounders in the inner tubes; 7), filling in the harsh concrete in the reinforcement cages, and hammering the inner tubes to perform squeezing; 8), repeatedly filling and squeezing the harsh concrete to enable the main reinforcements at the bottom ends of the reinforcement cages to be scattered outwards to be built in the harsh concrete in the manner of wrapping; 9), pouring concrete into the outer tubes to pile heads; and 10), lifting out the outer tubes, and vibrating the concrete to be compact.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to the construction technology of piles. Background technique [0002] In the pile foundation of a building, sometimes the pile foundation not only needs to resist pressure, but also needs to provide a certain pullout resistance. In the patent documents of Publication No. CN1214158C and Patent No. 98124854.3, a construction method for concrete anchor piles is provided, through a steel cage with an expandable diameter part, and the expandable diameter of the steel cage is tamped by fillers. The section expands to form an enlarged head at the end of the pile. However, it has been found in practice that the weight of the hammer used in this method is very powerful, and the bottom of the hammer often directly hits the steel bar at the diameter-expandable part, which easily causes the steel bar to be sheared and broken, thereby losing the pull-out resistance. At the same time, because ...

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Problems solved by technology

However, in the actual implementation, it was found that due to the high energy of the heavy hammer used in this method, the bottom of the hammer often directly hits the steel bar in the diameter-expandable part, which is likely to cause the steel bar to be sheared and broken, thus losing the pull-out resistance

At the same time, because this method is to place the reinforcement cage first, and then fill it with tamping, although the inner layer of the steel bar in the expandable part is filled with dense packing, but the outer layer of the steel bar is only the original soil layer, so the diameter of the expandable part Reinforcement is not sufficiently wrapped by filler, so the pullout resistance provided is not sufficient

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