A method for deformation control of large-span tunnel in chlorite schist stratum. The method divides the large deformation of large-span tunnel in chlorite schist stratum into five deformation grades according to the surrounding rock conditions of the tunnel. In response to each deformation grade, the deformation control of large-span tunnel is determined so as to ensure the safety and stability of the tunnel support structure and to avoid the clearance intrusion caused by tunnel deformation.

A rock burst active prevention and control mechanism, which includes: a NPR reinforcing mesh, rod bodies, NPR steel panels, an embedding reinforcement and a NPR steel fibre concrete, the NPR reinforcing mesh is formed by horizontal and vertical interlacing of NPR steel bars, and is provided against a surrounding rock of a tunnel, extending ends of the rod bodies are penetrated out of a hole of the NPR reinforcing mesh, the NPR steel panels are provided with multiple through-holes, the rod bodies, which are located on a same radial plane in the tunnel, are connected to one of corresponding NPR steel panels, the embedding reinforcement is connected between the extending ends of two adjacent rod bodies, the NPR steel fibre concrete is overlaid on the extending ends of the rod bodies and the embedding reinforcement.

A tunnel reinforcement system having a plurality of structural supports positioned at spaced intervals along the length of a tunnel. Each structural support has a plurality of structural segments connected in an end to end relationship. Each structural segment has a plurality of bars connected to a first end and a second end, in which the first end comprises a first butt plate having one or more apertures, and the second end comprises a second butt plate having one or more apertures. The one or more apertures of the first butt plate or the second butt plate of a structural segment are coaxially aligned with the one or more apertures of the first butt plate or the second butt plate of another structural segment in an end to end relationship. The first butt plate or the second butt plate of a structural segment is attachable to the first butt plate or the second butt plate of another structural segment in an end to end relationship. Each structural support defines a geometric supporting framework.

A method for deformation control of large-span tunnel in chlorite schist stratum. The method divides the large deformation of large-span tunnel in chlorite schist stratum into five deformation grades according to the surrounding rock conditions of the tunnel. In response to each deformation grade, the deformation control of large-span tunnel is determined so as to ensure the safety and stability of the tunnel support structure and to avoid the clearance intrusion caused by tunnel deformation.

A section of a node of the station is a section with an arch roof and a straight wall of three underground floors, a first underground floor is a station hall floor 1, and a second underground floor is a platform floor 2 of a subway line A and a third underground floor is a platform floor 3 of a subway line B; and directions of the subway line A and the subway line B are orthogonal. Second lining structures of the first and second underground floors are firstly constructed, and after a shield tunneling machine is pushed through the station, the structure of the third underground floor is constructed by a reverse construction method. Thus, the present disclosure is conducive to improving the efficiency of overall construction, guaranteeing timely tunnel construction completion of two lines and hence timely track construction completion and electricity wiring completion.

A method of installing a fill fence system at a predetermined location to at least partially cover an opening defined by a back, a floor, and side walls. The method includes providing a carrier system including a carrier assembly, locating the carrier assembly in a safe zone adjacent to the unsafe zone, and positioning an assembled fill fence assembly on the carrier assembly. The carrier assembly and the full fence assembly are moved to a preselected location. With the carrier assembly at the preselected location, the fill fence assembly is positioned at the predetermined location, and installed at least partially to cover the opening. The carrier assembly is disengaged from the fill fence assembly and removed from the preselected location. The fill fence system includes a securing element is applied to help secure the fill fence assembly in the opening.

A method of installing a fill fence system at a predetermined location to at least partially cover an opening defined by a back, a floor, and side walls. The method includes providing a carrier system including a carrier assembly, locating the carrier assembly in a safe zone adjacent to the unsafe zone, and positioning an assembled fill fence assembly on the carrier assembly. The carrier assembly and the full fence assembly are moved to a preselected location. With the carrier assembly at the preselected location, the fill fence assembly is positioned at the predetermined location, and installed at least partially to cover the opening. The carrier assembly is disengaged from the fill fence assembly and removed from the preselected location. The fill fence system includes a securing element is applied to help secure the fill fence assembly in the opening.

The invention relates to a protective element (20) for connecting to a concrete element (10) of a tunnel lining, to the concrete element (10) and to the method for producing the concrete element (10). It is an object of the invention to provide a protective element (20) for a tunnel lining, or the associated concrete element, which ensures that the protective casing of the tunnel lining is better safeguarded against corrosive gases or liquids. The solution of the invention provides that the protective element (20) is produced from an injection-moldable plastics material, that a protective portion (21, 22, 23) is connected in a single piece to a seal (30), wherein the connection is gas-tight and liquid-tight, that the protective portion (21, 22, 23) is connected in a single piece to a connecting element (24, 25, 26, 27, 28), and that the single-piece connection is produced by injection molding of the plastics material.

A retainment wall for underground horizontally extending mine shafts wherein a spaced vertical series of horizontal support ribs are secured to one or more upright supports that are secured in the mine shaft between the side walls thereof. Porous material covers and is secured to the forward retaining face of the wall structure. If the retainment wall structure is to be used as a fill retainment barrier the porous material is spray coated with a settable sealant which covers the forward face of the wall structure and the perimeter thereof to seal off the mine shaft.

A reinforced concrete structure including a reinforcement made from a plurality of elongate longitudinal members of fibreglass or like material, disposed substantially parallel with one another in at least one predetermined direction. The elongate longitudinal members are coupled to one another by means of coupling members of fibreglass or formed by a strip of flexible polymer material. Metal and/or synthetic fibres are mixed with the concrete matrix to provide the structure with shear strength, making it possible substantially to reduce the number of coupling members.