Tunnel primary support corrugated steel-sprayed concrete support constructed through underground excavation method

Abstract

The invention discloses a tunnel primary support corrugated steel-sprayed concrete support constructed through an underground excavation method, and belongs to the technical field of tunnel construction. In order to solve the problems that a prefabricated concrete lining in the prior art is inconvenient to transport and carry, high in laying difficulty, poor in waterproof effect and prone to water seepage, the prefabricated concrete lining comprises a supporting cross beam and supporting structures arranged on the two sides of the supporting cross beam, a protruding block is fixedly installed at one end of a cross beam body, and extension structures are installed on the two sides of the cross beam body in a welded mode. A concrete structure is laid in a gap between the lower corrugated steel and the upper corrugated steel, and grouting is performed between the outer surfaces of the corrugated steel and a soil body, so that uniform stress of the corrugated steel is ensured, the corrugated steel is light in weight, special machinery is not needed, and meanwhile, the assembly speed is high; and meanwhile, concrete is sprayed on the corrugated steel to form a corrugated steel-concrete combined structure, and the bearing capacity and rigidity of the device can be further improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to the support of primary corrugated steel-sprayed concrete support for tunnel construction by an undercut method. Background technique [0002] Tunnels are buildings built underground or underwater or in mountains, where railways or roads are laid for motor vehicles to pass. According to its location, it can be divided into three categories: mountain tunnels, underwater tunnels and urban tunnels. In order to shorten the distance and avoid large slopes, it is called a mountain tunnel to pass under a mountain or hill; to pass under a river or a strait, it is called an underwater tunnel; to meet the needs of railways passing through big cities, it is called an underwater tunnel. The underground passages are called urban tunnels. Among the three types of tunnels, the mountain tunnels are the most constructed. [0003] Patent document CN201911232128.X discloses a high-str...

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Problems solved by technology

[0003] Patent document CN201911232128.X discloses a high-stress roadway combined ring body beam support structure, including roadway and support ring body, and a homogeneous support ring body is built around the roadway, and the support ring body includes grouting anchors Rods, pull-out anchors, U-shaped steel brackets, wire rope nets, and concrete shotcrete layers; the first layer of concrete shotcrete layers is formed by spraying grout on the inner surface of the roadway, and radially placed grouting anchors are placed on the concrete shotcrete layer Rods, grouting anchors include long grouting anchors and short grouting anchors; after the short grouting anchors are injected with Portland cement-water glass material, the internal grouting formed by the surrounding rock in the shallow loose damage zone of the roadway The reinforced waterproof ring will form the second support ring layer after the reinforced waterproof ring is solidified; after the high-pressure concrete grout is injected into the long grouted anchor rod, the external grouting reinforcement ring will be formed in the surrounding rock in the deep incomplete damage area of ​​the roadway, and the external grouting After the reinforcement ring is solidified, the third support ring layer is formed; in the roadway, on the inner surface of the first layer of concrete shotcrete layer, there are radial and evenly placed anti-uplift anchors, and the anti-uplift anchors are connected with anchor pressure plates. The steel wire rope net is pressed under the plate, and is evenly cemented by spraying the multi-layer tough concrete shotcrete layer structure attached to the rock surface with high density to form the fourth retaining ring layer; the U-shaped steel bracket is arranged on the surface of the fourth retaining ring layer, The U-shaped steel bracket forms the fifth support ring layer, and multiple support ring layers together constitute the support ring body structure of the support system, forming an internal load-bearing support structure for the roadway. Although the support structure mentioned in this patent bears It is an integral structure, which is not convenient for transportation and handling, and it is difficult to lay, and the traditional support structure is mostly made of concrete structure, the surface is easy to crack, the waterproof effect is poor, it is easy to seep, and the use effect is not good

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