Concrete-lined tunnel structure, circular flat jack and high-pressure tunnel technology

Abstract

The invention discloses a novel pre-stressed concrete-lined tunnel structure, circular flat jacks and a high-pressure tunnel technology. The novel pre-stressed concrete-lined tunnel structure comprises multiple circular flat jacks, wherein the multiple circular flat jacks are longitudinally and uniformly distributed on the inner wall of a tunnel along a center line of the tunnel; preferably, the novel pre-stressed concrete-lined tunnel structure is provided with multiple water-stop elastic bodies, and the multiple water-stop elastic bodies are in circular shapes and are arranged between concrete-lined sections. According to the circular flat jacks adopted by the invention, the using of a pre-stressed steel material in the prior art is omitted, the construction is convenient, the pre-stressed degree is increased, a concrete-lined layer cannot be subjected to pulling stress, thus a longitudinal crack is prevented from appearing, and the phenomenon that water in the tunnel seeps out of the tunnel can be prevented from happening.

Description

technical field [0001] The invention relates to a novel prestressed concrete lining high-pressure tunnel structure, an annular flat jack and a high-pressure tunnel construction technique. Background technique [0002] In hydropower projects and water delivery projects, power generation diversion tunnels are generally pressurized tunnels, and their cross-sections are mostly circular, because the main load they bear is uniform internal water pressure, and their stress conditions are better. Since the cave body is excavated in the rock mass, and the original equilibrium state of the rock mass is destroyed after excavation, the rock mass may be deformed and collapsed, and the cave body has to bear internal and external water pressure and surrounding rock pressure, etc. effect. Therefore, the existing cave body is generally provided with permanent prestressed concrete lining with sufficient strength and impermeability to ensure safety. [0003] In existing prestressed concrete-...

AI Technical Summary

Problems solved by technology

Even so, engineers still have some doubts about the durability of the anchor and the entire unbonded anchor system

And no matter whether there is a bonded steel strand lining the tunnel or an unbonded steel strand lining the tunnel, a large number of steel strands are required to apply prestress, but limited by the existing technology, the amount of steel strands is restricted, so Its prestress is also further limited, so that the ability to resist longitudinal cracks in the tunnel is insufficient, reducing the durability of the entire structure, and it usually requires a large number of non-prestressed steel strands, which further increases the construction cost. It also makes the construction very troublesome

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