Construction method of guarantying pile length of driven cast-in-place pile constructed in pebble layer or sand layer

Abstract

The invention relates to a construction method which can be constructed at a gravel layer, a round gravel layer, a breccia layer, a sand layer or a strong weathered mudstone and can ensure the constructive pile length to meet the design requirements. The construction method is characterized in that: Firstly, an inner pipe with an opening at the bottom is arranged inside an outer pipe with an opening at the bottom, and then the base of a heavy punch is arranged on a round steel plate at the top of the inner pipe. Secondly, the heavy punch is started to hammer the round steel plate at the top of the inner pipe, so that the inner pipe and the outer pipe can be sunk into the bed soil; when the cast-in-place pile is difficult to be implemented, but the constructive pile length can not meet the design requirements, the inner pipe is drawn out, and the filler crushed inside the inner pipe in cast-in-place pile is cleared, and then the inner pipe is inserted into the outer pipe again, after that, the heavy punch is restarted to hammer the round steel plate at the top of the inner pipe so as to make the inner pipe and the outer pipe sink into the bed soil, such process is repeatedly. Thirdly, the inner pipe is drawn out, and a steel cage is arranged into the outer pipe, and the outer pipe is poured with concrete. Fourthly, the surface of the concrete inside the outer pipe is pressed by the inner pipe in which the filler is cleared, and then the outer pipe is pulled out in uniform speed slowly. Fifthly, when all the outer pipes are pulled out, the pipe is vibrated by a vibrating spear. The filler which is squeezed into the inner pipe is cleared repeatedly, thereby the depth of the cast-in-place pile can meet the designed pile length.

Description

technical field [0001] The invention relates to a construction method of concrete pouring piles, in particular to a construction method which is constructed in a pebble layer, a round gravel layer, a breccia layer or a sand layer and can ensure that the length of the construction pile meets the design requirements. technical background [0002] Invention patent application "construction method of sinking cast-in-situ piles in pebble layer and sand layer to ensure pile length" (patent application number: 2007101885943) discloses a method of constructing piles in pebble layer, round gravel layer, breccia layer, sand layer or strong wind The method of constructing compact immersed pipe grouting piles in geology such as mudstone, but the natural strength of this kind of geology is relatively high, and the immersed pipe is difficult, and the depth of the immersed pipe often fails to meet the design requirements. Contents of the invention [0003] The purpose of the present inve...

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Problems solved by technology

[0002] Invention patent application "construction method of sinking cast-in-situ piles in pebble layer and sand layer to ensure pile length" (patent application number: 2007101885943) discloses a method of constructing piles in pebble layer, round gravel layer, breccia layer, sand layer...