Water stop method for upper-soft and lower-hard water-rich stratum foundation pit engineering retaining structure
A technology for water-rich strata and enclosure structures, applied in infrastructure engineering, excavation, construction, etc., can solve the problems that the medium is easy to be washed away by water, the water-stop effect is not ideal, and the solidified pile cannot be formed, so as to achieve the guarantee The effect of foundation pit stability, good soil retaining effect, and low construction risk
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[0039] As attached figure 1 As shown, the features of the foundation pit enclosure structure of the present invention include: bored pile 3, high-pressure jet grouting pile or triaxial mixing pile 4, soft and hard soil interface water-stop curtain 6, deep hole curtain grouting 7, initial stage The support 10 and the support system, the support system includes a horizontal steel cross brace 11 and a circumferential steel purlin 12.
[0040] As attached figure 2 As shown in step 1), first carry out the construction of the bored pile 3, at the stratum design position outside the excavation line of the foundation pit, first use a drill to drill through the soil layer 1 to the design position in the rock layer 2, lower the steel cage, and pour concrete The bored pile 3 is formed to complete the first-layer enclosure structure outside the foundation pit.
[0041] As attached image 3 As shown in step 2), on the outside of the bored pile 3, perform high-pressure jet grouting pile or tria...
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