Preparation method of deep water-rich sand layer diaphragm wall groove wall reinforcing material

Abstract

The invention discloses a preparation method of a deep water-rich sand layer diaphragm wall groove wall reinforcing material, and the method comprises the following steps: S1, pouring water, cement and an accelerator into an on-site slurrying barrel, and stirring to form cement slurry with the weight ratio of water to cement being (0.6-0.8): 1 and the accelerator accounting for 2-4% of the weightof the cement; s2, sieving the uniformly stirred cement slurry through a filter screen; and S3, storing the sieved cement slurry in a slurry storage barrel for standby application, wherein the storagetime does not exceed 2 hours. According to the method, the coagulation speed of the cement slurry in a deep water-rich sand layer after three-axis stirring is effectively increased, the cement slurrycan be rapidly coagulated in the deep water-rich sand layer within 10 minutes, a large amount of the cement slurry is prevented from being lost in the deep water-rich sand layer, and the problem thatthe reinforcing effect cannot be guaranteed due to loss of the cement slurry is solved.

Description

technical field [0001] The invention relates to the field of urban rail transit engineering, in particular to a method for arranging reinforcing materials for connecting walls and groove walls of deep and thick water-rich sand layers. Background technique [0002] At present, with the development of urban subways in China, more and more coastal cities have begun to build subways on a large scale, such as Shenzhen and Fuzhou. However, the geological conditions of coastal cities are relatively complex, and there are deep water-rich sand layers, such as Happy Valley Station of Fuzhou Metro Line 5, where the sand layer is 14.5-16m thick, with an average thickness of 15.3m, and the buried depth of groundwater is 0.60-1.60m . The construction quality of the underground diaphragm wall in the deep water-rich sand layer is prominent. After coring and ultrasonic testing, it was found that the concrete core was broken, mixed with mud and sand, and not compacted. The main reason was th...

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Problems solved by technology

[0004] At present, there are not many studies on the technology of three-axis stirring piles, mainly reinforcement equipment and methods, such as three-axis stirring pile machine and its blades (application number CN201520321833.8), a new type of three-axis stirring pile device (application number CN201520890547. 3), a three-axis mixing pile drill pipe verticality control device (application number CN201620785719.5) and a three-axis mixing pile water-stop curtain construction method (application number is a three-axis mixing pile water-stop curtain construction method), a Construction method of three-axis mixing pile in water-rich gravel sand layer (application number CN201810516561), a construction method of three-axis mixing pile for auxiliary reinforcement of underground diaphragm wall into groove (application number CN201810516561), etc. Only different proportions of cement slurry are used for reinforcement, However, there is no research on special mixing materials

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