Frozen wall enclosure structure in portal ring beam construction and construction method thereof
A technology of enclosure structure and freezing wall, which is used in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve the problems of uneven reinforcement, large dispersion of reinforcement, poor excavation safety, etc., and achieves a large and uniform freezing range. Good sex, low difficulty effect
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[0043] Such as Figure 1 to Figure 5 As shown, the frozen wall enclosure structure in the construction of the portal ring beam of the present invention includes the A row of frozen pipes 1 and the B row of frozen pipes 2 arranged at the junction of the station foundation pit 4 and the tunnel segment 5; After the liquid nitrogen and brine are sequentially injected into the freezing pipe 2 of row B, a freezing layer with a thickness not less than 1.5 times the width of the door ring beam will be formed at the junction of the station foundation pit 4 and the tunnel segment 5 and in the strata around the tunnel segment 5. Wall 6 enclosure structure.
[0044] Such as figure 2 As shown, the A row of frozen pipes 1 is located in the existing occlusal pile 3 of the station foundation pit 4, and is driven vertically from the ground. 1 is a pipe curtain composed of frozen pipes arranged side by side along the longitudinal section perpendicular to the horizontal axis of the tunnel, an...
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