Pre-consolidation-prestress-reinforcement coupled fluid mud solidification pile preparation method and preparation structure

Abstract

The invention relates to a preparation method and structure of a fluid mud solidified pile with pre-consolidation-prestress-reinforcement coupling effect. The preparation method of the fluid mud solidified pile can be injected into the foundation under the premise of maintaining the fluidity of the solidified fluid mud Form the fluid mud solidified pile, and form normal stress in the fluid mud solidified pile, at the same time, in the fluid mud consolidation drainage process, continue to maintain the normal stress, so that the fluid mud solidified pile formed by the preparation method of the present invention has a relatively high High strength, to meet the ground treatment requirements.

Description

technical field [0001] The invention relates to a preparation method and a preparation structure of a fluid mud solidification pile with coupling effects of pre-consolidation-prestress-reinforcement, and belongs to the field of resource utilization of fluid mud. Background technique [0002] There are many rivers in our country, and the dredging of rivers will produce a large amount of dredging mud with high water content every year. In addition, with the increasing urban construction, underground diaphragm walls, bored piles, trenchless horizontal directional drilling, mud-water balance pipe jacking projects and In projects such as mud-water pressurized shield projects, a large amount of waste mud is inevitably produced. Whether it is river dredging mud or engineering waste mud, because of its extremely high water content, it is generally in a fluid state, so it belongs to the category of fluid mud. It should be pointed out that due to the characteristics of high moisture ...

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Problems solved by technology

At present, the flow solidification treatment is generally to add a solidifying agent to the fluid mud at a relatively high water content to achieve a certain fluidity), and then use the pumping construction method to inject the solidified fluid mud into the ground to form a solidified pile, that is Fluid mud solidification pile; Obviously, fluid mud solidification pile not only solves the disposal problem of waste fluid mud, but also strengthens the engineering foundation, and has a high application prospect; the operation of injecting solidified fluid mud into the ground to form solidification pile can be Referring to the concrete pile grouting in the construction field, for example, the application number 201821065607.8 discloses a superfluid concrete pile bottom grouting device, which includes a steel cage composed of multiple sets of ring beams and longitudinal beams, and the longitudinal beams are fixed in the ring. On the beam, the grouting pipe is parallel to the longitudinal beam and fixed on the ring beam; the lower length of the grouting pipe exceeds the lower end of the ring beam by 200-300 mm; a conical part is set under the grouting pipe, and the maximum diameter of the conical part is larger than the grouting The outer diameter of the pipe; the pipe wall of the grouting pipe between the top of the conical part and the ring beam is provided with multiple outlets; the fixing place between the grouting pipe and the lower ring beam is provided with an obliquely upward support pipe, and the two ends of the support pipe are fixed On the ring beam; however, compared to the rapid solidification of the cement slurry itself, there are insurmountable defects in the fluid mud solidification pile technology, mainly in order to maintain a certain fluidity of the solidified fluid mud, so it needs to be used under the condition of high water content. Carry out curing treatment, and the curing agent cannot be added too high (the higher the curing agent content, the worse the fluidity of the solidified fluid mud, and it cannot be pumped for construction). However, it is known from practice that after the high water content fluid mud is cured, The strength of solidified fluid mud is low, and after being injected into the foundation to form piles, it cannot meet the requirements of foundation treatment

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