Method of constructing shallow tunnel underground passage variable-cross section cross mid-partition wall
An underground passage, shallow buried and underground excavation technology, which is applied in the direction of underground chambers, tunnels, tunnel linings, etc., can solve the problems that are not conducive to cross flow operation and product protection, increase the difficulty and cost of slag discharge and transfer, and change the risk of process conversion of variable cross-section passages and other problems, to achieve the effect of reducing the calculation span, shortening the construction period, and solving the difficulty of construction
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Embodiment 1
[0034] This embodiment is aimed at the construction method from large section to small section with different heights.
[0035] Such as figure 1 as well as Figure 3 to Figure 5 As shown, the present embodiment provides a construction method for a shallow-buried submerged tunnel with a variable cross-section crossing partition wall, which includes the following steps:
[0036] 1) Divide the first section AA1 of the channel into several pilot tunnels along the excavation direction. In this embodiment, taking the division of 9 pilot tunnels as an example, they can be divided according to the height or width of 2.0-3.5m;
[0037] 2) Use the CRD method to complete the initial support of the first section AA1, the second section BB1, and the third section CC1, such as using the advanced small conduit 4 for grouting reinforcement, and the temporary partition wall 2, temporary inverted arch 3 and spraying Anchors are used as primary support, wherein the areas of the first section A...
Embodiment 2
[0044] This embodiment is aimed at the construction methods from small sections to large sections with different heights.
[0045] Such as Figure 2 to Figure 5 As shown, the present embodiment provides a construction method for a shallow-buried submerged tunnel with a variable cross-section crossing partition wall, which includes the following steps:
[0046] 1) divide the first section DD1 of the channel into several pilot tunnels along the excavation direction, in this embodiment, take the division of 6 pilot tunnels as an example, which can be divided according to the height or width of 2.0-3.5m;
[0047] 2) Use the CRD method to complete the initial support from the first section DD1 to the second section C2C3 of the channel, and the areas of the first section DD1 and the second section C2C3 are equal;
[0048] 3) Divide the third section CC1 into several guide holes (in this embodiment, 9 guide holes are taken as an example), the third section CC1 and the second section C...
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