Grouting bottom-sealing structure and construction technology of deep foundation pit in high-pressure water-thick sandy pebble stratum
A grouting back cover and high pressure bearing technology, applied in infrastructure engineering, construction, etc., can solve the problems of foundation leakage, long construction period, large grouting volume, etc., and achieve the effect of slow construction period and huge cost
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[0038] This embodiment is a station of the Beijing subway, its length is 139.2m, the depth of the foundation pit of the standard section is 31.6m, and the width is 24.9m. The floor of the station is mainly located on the pebble layer with strong water permeability, and the confined water level outside the pit is 13m away from the bottom of the pit.
[0039] According to the existing technology in the basement full-scale grouting and back-sealing scheme: the enclosure structure adopts a 1.0m thick underground diaphragm wall, the embedded depth is 15m, and the sleeve valve pipe is used for full-scale grouting within the 15m range of the basement. Inject double liquid slurry in the range of 3m, such as Figure 4 shown. It is estimated that the construction cost of the enclosure structure is about 62.29 million, the grouting cost is 112.8 million, and the grouting construction period is 3 months.
[0040] In the actual construction process, the construction structure is as follo...
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