Advanced pre-grouting device suitable for shallow-buried tunnel construction in sand soil layer and construction process
A technology for shallow-buried tunnels and sandy soil layers, which is applied in the field of advanced pre-grouting devices and construction techniques for shallow-buried tunnels in sandy soil layers. cumbersome and other problems, to achieve the effect of simple grouting device and process, high rigidity, and simple structure of grouting device
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[0035] The present invention will be further described below in conjunction with the drawings and embodiments.
[0036] An advanced pre-grouting device suitable for shallow buried tunnels in sand, such as figure 1 As shown, it is mainly composed of auxiliary casing and grouting inner pipe. The auxiliary casing includes thickened steel pipe 4, grouting tip cap 10, one-way grout hole 3, tail flange 2, sealing flange 1. The pipe includes a steel pipe 7, a straight valve 6, a flange 8, a rubber piston 9, and a slurry hole 5.
[0037] The auxiliary casing is sleeved on the outer layer of the grouting inner pipe; the head of the auxiliary casing sleeve is equipped with a grout stop tip cap 10, and the middle part is provided with a unidirectional grout hole 3 to prevent the backflow of the slurry; between the grouting inner pipe and the auxiliary casing There are two rubber pistons 9 and two flanges 8. The rubber pistons are sleeved on the grouting inner pipe and are arranged adjacent to...
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