An inflatable folding tunnel reinforcement structure and a construction method thereof are provided. The inflatable folding tunnel reinforcement structure includes an inflation port, an airbag, a water blocking net, a steel plate, a scissor folding mechanism, a vertical support plate, an arc-shaped support plate, drainage channels, an upper support rod, a lower support rod, a locking pin, a threaded steel rod, a rolling connection pin, and an induction motor, where the upper support rod and the lower support rod are unfolded in opposite directions to a preset position through the steel rod; and the drainage channels are configured to perform water guidance and resistance for a leakage-proofing purpose. The construction method includes: preparation before construction, device fixation, on-site construction, structural inspection, and site cleaning.

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 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 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 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 high-strength confined concrete support system for an underground tunnel. The support system includes multiple confined concrete arches, bolts and cables, and a prestressed steel strand backfilling system. The confined concrete arches all support the surrounding rock of the tunnel and are sequentially arranged along the tunnel. Every two adjacent confined concrete arches are connected by a longitudinal connection structure. The support system is provided with a plurality of layers of steel bar meshes on the surrounding rock side and the tunnel side, and shotcrete layers are sprayed on the support system and the steel bar meshes. The prestressed steel strand backfilling system comprises a prestressed steel strand system and a filling material. The filling material fills the space between each confined concrete arch and the surrounding rock to equalize a load on the confined concrete arch and generate prestress.

A telescopic device includes a first U-shaped connector with a plurality sets of adjustment slots defined in two sides thereof and arranged along an adjustment direction; a second U-shaped connector defining first through holes in two sides thereof, the second U-shaped connector being inserted into the first U-shaped connector with U-shaped openings thereof opposite to each other to define an accommodating space; a first spring located in the accommodating space and abutting against the first and second U-shaped connectors, respectively; an elastic pin with two ends thereof extending through the first through holes and engaging into one of the plurality sets of adjustment slots; and an initial fixing pin being detachably connected to the first and second U-shaped connectors. A telescopic annular tunnel steel arch includes an upper arch, two lower arches and two telescopic devices connecting two ends of the upper arch to the two lower arches, respectively.

A telescopic device includes a first U-shaped connector with a plurality sets of adjustment slots defined in two sides thereof and arranged along an adjustment direction; a second U-shaped connector defining first through holes in two sides thereof, the second U-shaped connector being inserted into the first U-shaped connector with U-shaped openings thereof opposite to each other to define an accommodating space; a first spring located in the accommodating space and abutting against the first and second U-shaped connectors, respectively; an elastic pin with two ends thereof extending through the first through holes and engaging into one of the plurality sets of adjustment slots; and an initial fixing pin being detachably connected to the first and second U-shaped connectors. A telescopic annular tunnel steel arch includes an upper arch, two lower arches and two telescopic devices connecting two ends of the upper arch to the two lower arches, respectively.

An apparatus to install structural supports in a mine tunnel is conveniently mountable on a mining machine having a cutting head mounted at one end of a boom. An extendable and slewing manipulator arm of the apparatus is mounted on a support platform that is slidable in the axial forward and rearward direction and includes a grasping device to hold the structural supports in a plurality of different positions.