Safe construction method for mine tunnel

Abstract

The invention relates to a safe construction method for a mine tunnel. The two ends of an arch part are in cast-in-place butt joint with the two ends of an inverted arch through side walls correspondingly, and the arch part is subjected to secondary lining through prefabricated pipe pieces. The safe construction method comprises the steps that S1, after excavation and primary supporting of the tunnel are completed, construction of secondary lining is started; S2, the side walls are subjected to lining pouring through a formwork trolley, and connectors used for connecting the prefabricated pipe pieces are pre-buried in the connecting positions of the side walls and the two ends of the arch part; S3, the connectors and the prefabricated pipe pieces are assembled, and longitudinal pre-tightening construction and arch part back grouting are conducted; S4, the connectors are subjected to concrete pouring; and S5, the step S3 and the step S4 are repeated till all the prefabricated pipe pieces are assembled. According to the safe construction method, the arch part is made of the prefabricated pipe pieces, the rest of the parts are subjected to cast-in-place through the lining formwork trolley, the prefabricated pipe pieces and the cast-in-place side walls are connected through the connectors, and holes existing in the whole-ring cast-in-place process can be eliminated in the prefabricating stage.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and in particular relates to a safe construction method for mine tunnels. Background technique [0002] During the construction of the tunnel, due to the control of the groundwater level, the excavation of the soil, the grouting reinforcement and other construction forms, the soil is disturbed to varying degrees, which causes changes in the soil structure, resulting in Subsidence occurs on the surface. The mining method refers to the construction method of constructing tunnels by excavating underground tunnels. The mining method is a traditional construction method. Its basic principle is that after the tunnel is excavated, it is affected by blasting, causing the rock mass to rupture and form a slack state. , It may collapse at any time. Based on this theoretical basis of slack load, the construction method is to adopt a segmented excavation one by one according to the order of divisions, a...

AI Technical Summary

Problems solved by technology

[0003] As a means of rail transportation, the railway relies on the safe operation of the tunnel to ensure the safety of the railway track and the station. During the construction of the railway tunnel, due to the influence of the surrounding rock disturbed by the underground excavation, the surrounding rock needs manual support, and it is carried out in accordance with strict construction procedures. In tunnel construction, the secondary lining of traditional tunnels usually uses a lining formwork trolley for integral casting and is connected with the inverted arch to form a ring. However, most of the secondary lining arches constructed by this construction method have defects such as voids behind, insufficient thickness or insufficient strength.

With the increase of the operation time of the tunnel, the problem of secondary lining arch defects has become more and more prominent, which has brought serious quality problems such as longitudinal cracking and block loss of the lining. The operation has created a great safety hazard. On the one hand, it will cause the vault to fall off, which will affect the safe passage of the train; unstable

Images