A Construction Method for Small Angle Intersecting Tunnels

Abstract

The invention discloses a construction method of a small-angle intersection tunnel, which comprises the following steps: Step 1: After the upper tunnel is constructed to the intersection section, excavate the intersection section of the upper tunnel, and construct the arch wall of the intersection section of the upper tunnel Initial support; step 2: apply support piles at intervals downward from the upper tunnel, and the support piles include the second support piles located in the intersection section of the tunnel below, and the first support piles located on both sides of the intersection section of the tunnel below. Supporting piles; Step 3: Applying the secondary lining of the intersection section of the tunnel above; Step 4: After the secondary lining concrete of the intersection section of the tunnel above reaches the design strength, the intersection section of the tunnel below Advance support; Step 5: Excavate the intersection section of the tunnel below, and after exposing the second support pile each time, cut the pile body of the second support pile within the scope of the tunnel below in sequence Pile treatment, and the implementation of primary support and secondary lining.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a construction method for a small-angle intersection tunnel. Background technique [0002] The construction of railways, highways and other projects often encounter multi-level intersection tunnel projects. The construction of such projects generally follows two principles. One is to ensure that the upper and lower tunnels intersect vertically or at a large angle to reduce the length of the mutual influence section; It is to construct the lower tunnel first and then the upper tunnel, so that when the upper tunnel is constructed, it will not have a great impact on the lower tunnel. The upper tunnel that has already been constructed has the adverse consequence of subsidence. However, in actual engineering, it is often difficult to follow the above two principles due to the arrangement of large construction groups and other reasons. When the intersection angle of the upp...

AI Technical Summary

Problems solved by technology

[0002] The construction of railways, highways and other projects often encounter multi-level intersection tunnel projects. The construction of such projects generally follows two principles. One is to ensure that the upper and lower tunnels intersect vertically or at a large angle to reduce the length of the mutual influence section; It is to construct the lower tunnel first and then the upper tunnel, so that when the upper tunnel is constructed, it will not have a great impact on the lower tunnel. Adverse consequences of subsidence of the already constructed upper tunnel

However, in actual engineering, it is often difficult to follow the above two principles due to the arrangement of large construction groups and other reasons. When the intersection angle of the upper and lower tunnels is small (less than 45 degrees), and the upper tunnel must be constructed before the lower tunnel, the existing The construction method cannot construct a tunnel structure that meets the design requirements and use requirements

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