Straight wall micro arch roadway and chamber U steel support technology

Abstract

The invention relates to the field of tunnels, in particular to a straight wall micro arch roadway and chamber U steel support technology. A mining area draining lane and a shunting chamber connectedwith the draining lane are included, the bottom of the shunting chamber is provided with a concrete bottom plate, a steel support is fixedly mounted on the inner wall of the shunting chamber in the circumferential direction, the steel support is composed of an arch beam for supporting a top plate of the shunting chamber and stand columns fixedly mounted on the ends of the arch beam, a prestress steel strand anchor cable in the shunting chamber is omitted, connection of a prestress steel strand anchor cable hole and a water-rich top plate rock medium is omitted, bottom plate loosening, argillization, pucking and construction difficulty to the roadway due to construction factors can be effectively reduced, the surrounding rock manual damage degree can be reduced, the surrounding rock integrality is kept, the surrounding rock loosening ring is reduced, and the surrounding rock self supporting force can be improved.

Description

technical field [0001] The invention relates to the field of tunnels, in particular to a U-shaped steel support technology for a straight-wall micro-arch roadway and a chamber. Background technique [0002] With the increase of mine excavation depth, roof and side management has become a prominent problem in our mine. This paper aims at mining area 23 of Meihuajing Coal Mine in Yuanyanghu Mining Area, which has high mine pressure and the coarse sandstone on the 2-2 coal seam is rich in water. Coal ( The cracks in the rock) layer are developed, and the water-conducting cracks can connect to the aquifer of the roof, resulting in a large amount of water in the anchor cable hole of the prestressed steel strand, the anchorage force of the anchor cable of the prestressed steel strand, and the lower bearing capacity of the roof, and the medium water in the aquifer of the roof The anchor cable hole of the prestressed steel strand is introduced into the roadway, making the floor of t...

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Problems solved by technology

[0002] With the increase of mine excavation depth, roof and side management has become a prominent problem in our mine. This paper aims at mining area 23 of Meihuajing Coal Mine in Yuanyanghu Mining Area, which has high mine pressure and the coarse sandstone on the 2-2 coal seam is rich in water. Coal ( The cracks in the rock) layer are developed, and the water-conducting cracks can connect to the aquifer of the roof, resulting in a large amount of water in the anchor cable hole of the prestressed steel strand, the anchorage force of the anchor cable of the prestressed steel strand, and the lower bearing capacity of the roof, and the medium water in the aquifer of the roof The anchor cable hole of the prestressed steel strand is introduced into the roadway, making the floor of the roadway soft, muddy, and swollen, which brings a lot of inconvenience to normal construction. The opening of the shunting chamber has a large collapse, and the prestressed steel strand support cannot To control the deformation of the surrounding rock, the deformation of the surrounding rock in the shunting chamber is very fast when the anchor cable is used to support the shunting chamber with anchor net spray, steel belt, and prestressed steel strand. Shunting brings difficulties to roadway auxiliary transportation and fully mechanized mining face installation

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