A construction method of pouring concrete piles with telescopic conduits

Abstract

The invention relates to a concrete pouring construction method under water, in particular to a construction method for pouring concrete piles by using telescopic conduits. At present, most of the underwater concrete pouring uses the method of pouring the concrete material by its own weight, and there are defects such as intermittent pouring operations and pipe plugging during construction. The technical solution of the present invention adopts a telescopic conduit with a bottom door and a sealable pipe body, sends the first batch of poured concrete to the bottom of the pile hole, opens the bottom door to release the concrete for bottom sealing, and continuously pumps through the delivery pump for pouring. At the same time, as the concrete surface rises, the conduit is shrunk synchronously until the pouring operation is completed. In the construction method of the invention, the pressure inside the pipe is controllable during the concrete pouring process, and the expansion and contraction of the pipe body is uniform and coherent when the pipe is lifted and lowered, which solves the problem of multiple interruptions of the pouring operation caused by the splitting of the material pipe in the prior art and the interruption time is long, the construction efficiency is low, and the process is difficult. It is difficult to control and affect the quality of the project, avoiding the quality problems of pile foundation caused by concrete segregation and slag inclusion.

Description

technical field [0001] The invention relates to a concrete pouring construction method, in particular to a construction method for pouring concrete piles with telescopic conduits. Background technique [0002] At present, most of the pouring construction of underwater concrete piles uses the method of pouring concrete along the conduit by its own weight, that is, a hopper with a lifting cover at the bottom is installed on the top of the pouring material pipe, concrete is preset in the hopper, and a hopper is placed at the upper end of the material pipe. The piston ball with the same diameter as the material pipe, when the amount of concrete reaches the bottom burial depth requirement, the cover is opened, and the concrete will quickly pour down into the pile hole under the action of gravity, and the piston ball will enter the water (or wall protection mud) in the pipe during the downward process Forced discharge from the bottom of the barrel. [0003] In actual construction...

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Problems solved by technology

[0003] In actual construction, affected by various factors such as the diameter of the conduit, the drainage effect of the piston sphere, the specific gravity of the retaining mud, the embedment depth of the end of the conduit, and the slump of the concrete, the above-mentioned operation method causes the concrete to be blocked, and the material pipe is easily blocked. Phenomenon; especially after the first batch of concrete materials are poured, sudden changes inside and outside the pipe may easily cause external water or mud pressure to penetrate into the pipe and mix with the concrete poured later, which greatly increases the difficulty of operation control and seriously affects the quality of the project

[0004] In addition, as the liquid level of the concrete material rises during the pouring process, the removal of the material pipe is time-consuming and laborious, resulting in multiple interruptions of the pouring operation, which not only prolongs the working time and reduces the work efficiency, but also the concrete pouring of two adjacent vehicles (buckets) There is an interval (in order to ensure the quality of the project, it is stipulated that the interval between two trucks of concrete shall not exceed 30 minutes), which will have a negative impact on the quality of concrete pouring to a certain extent, and even cause air chambers to form in the pipe, resulting in failure of pouring operations or broken piles, resulting in major economic loss

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