62results about How to "Improve self-supporting capacity" patented technology

A support method for high stress roadway coal-rock mass includes constructing surface wall rocks into a tough transition seal layer after the roadway is excavated and formed, respectively intersecting and distributing a self-entrance type grouting long anchor rod and a short anchor rod into the roadway coal-rock mass, injecting rigid slurry materials and soft slurry materials in the wall rocks inlayering mode, constructing the rigid slurry-material-injected wall rock into a rigid support layer in situ, modifying the soft-slurry-injected wall rock into a soft decompression layer in situ, and forming a rigid and soft nesting transition layer at the mutual nesting position of the two layers. The support method for the high stress roadway coal-rock mass improves the capacity of deep rock mass of the roadway wall rocks for adapting to large deformation and self-bearing, improves a stress distribution state of the high stress roadway wall rocks, enables the high stress roadway to be formedat one step and supported at one step, ensures the stability of the roadway under the conditions of complex structures, high stress, large range loosening and crushing and large deformation.

The invention relates to a self-supporting-layer stranding type anti-rat-bite cable and a manufacturing method thereof. The cable comprises a cable core and an outer sheath. The cable core is a layered stranding type cable core; an inner sheath coats the outsides of the layered stranding type cable core; and an anti-biting pecking-resistant splicing layer is arranged outside the inner sheath. Flat FRP strips are arranged and spliced along the circumferential direction of the inner sheath and to form the anti-biting pecking-resistant splicing layer. And the outer sheath coats the outside of the anti-biting pecking-resistant splicing layer. According to the invention, the flat FRP strips are distributed at the outer layer of the cable core densely, so that the cable has the good anti-biting pecking-resistant performance. The flat FRP strips as self-supporting tensile elements are combined with the outer sheath to form a composite outer protection layer; and the outer protection layer not only has the excellent anti-biting pecking-resistant performance but also has the high tensile capability and anti-compression capability, so that the self-supporting performance of the cable is improved. Moreover, the cable has advantages of simple and reasonable structure, large fiber capacity, excellent protection performance, high cable flexibility, and excellent bending performance is easy to use and lay; with the inner sheath, the cable fusion is realized conveniently; and the cable is convenient to manufacture and pollution on the environment is avoided.

The invention relates to pre-reinforcement projects for a tunnel-slope system, and provides a pre-reinforced composite structure for a tunnel longitudinally penetrating through slope and an implementation method thereof. The pre-reinforced composite structure comprises surface grouting, a surface anchor cable frame, a tunnel lining, grouting in tunnel and lining anchor cables. The implementation method of the pre-reinforced composite structure comprises the following steps of: based on engineering geology investigation results and geomechanical model recognition of the tunnel-slope system, determining the space layout form of the pre-reinforced composite structure, arranging surface grouting and the surface anchor cable frame firstly on the surface of the tunnel-slope system, arranging grouting in the tunnel as required, arranging bearing steel bars on the tunnel lining and pre-forming anchor cable holes for arranging the lining anchor cables. The implementation of the pre-reinforced composite structure provided by the invention can effectively reinforce the tunnel-slope system, thereby improving the stability of the slope and the self-bearing capacity of the tunnel surrounding rock, and ensuring the safe transport operation of the tunnel.

The invention discloses a U-type steel bracket capable of actively stabilizing surrounding rock. The U-type steel bracket comprises arch crown U-type steel, shed leg portion special-shaped U-type steel, clamps, a U-type elastic filling element and an anchor rod expansion component, and is characterized in that the two ends of the arch crown U-type steel are inserted into or in butt joint with the bent parts of the shed leg portion special-shaped U-type steel on two sides and are connected with and fixed to the bent parts of the shed leg portion special-shaped U-type steel on two sides through the clamps; after being installed on the wall of the U-type steel bracket, the U-type elastic filling element makes tight contact with the U-type steel bracket and the surrounding rock and isolates the U-type steel bracket from the surrounding rock; the shed leg portion special-shaped U-type steel on two sides is subjected to widening treatment; and anchor rod holes are reserved in the shed leg portion special-shaped U-type steel, the arch crown U-type steel and the U-type elastic filling element, and the anchor rod expansion component penetrates through the anchor rod holes to be drilled into the surrounding rock, and forms a uniform support structure with the U-type steel bracket. The U-type steel bracket can actively apply setting load on the surrounding rock, improve the self-bearing capacity of the surrounding rock, improve the stress state of the U-type steel bracket, enhance the local and overall support strength, ensure contractibility and improve the supporting efficiency.

A stability augmentation and solidification method for a large-section water-rich saturation fine-silt railway tunnel comprises the following steps that (1) advance dewatering is conducted by means of a double-side-wall advance pilot tunnel on the lower portion of the tunnel, and dewatering and solidification are conducted on a construction sand layer of the tunnel; (2) partial excavation is conducted, vertical steel frames are erected, the lower pilot tunnel is excavated in an upper and lower step core soil reserve method, the vertical steel frames are erected longitudinally, the whole ring of the primarily-erected steel frame of a main tunnel is divided into a plurality of units, and steel boards are utilized as flanges among the units and are connected through high-strength bolts; (3), fore shaft anchor pipes are fixedly connected to the steel frame connection boards, the anchor pipes are welded to the steel frames, the anchor pipes are filled with mortar, the steel frame connection boards are fixedly connected with longitudinal connection U-steel, and longitudinal connection reinforcing steel bars among the steel frames are distributed in a Z shape; (4) cement single fluid is poured to the back of the primarily-erected steel frame timely in a pressing mode after excavation is completed, and grouting and solidifying are conducted on the disturbed sand layer. According to the stability augmentation and solidification method, self-bearing ability of surrounding rock can be enhanced, and therefore construction safety is guaranteed.

Disclosed is a double cloth bags type grouting sealing set and method. The double cloth bags type grouting sealing set consists of a grouting device and a double cloth bags sealing device. The grouting device comprises a double-liquid equivalent grouting pump, a stirring barrel, a mixer and a rubber pipe. The double cloth bags sealing device is composed of a shallow grouting cloth bag, a deep grouting cloth bag, a rubber pipe and the like. Two grouting cloth bags encase a gas drainage pipe, a grouting and outlet line is connected, the parts are connected through quick connectors, a high hydraulic material grout mixed well is charged in, the high hydraulic material grout is charged into the shallow grouting cloth bag in a borehole after grouting is stopped, and after the grout in the two cloth bags solidifies and seals the borehole, the high hydraulic material grout is finally continuously charged into a hollow borehole between the two cloth bags through a hollow grouting pipe. Construction steps are simple, operation is convenient, the cost is low, and sealing effect is good.

The invention belongs to the field of tunnel construction and underground engineering, and discloses a sectional grouting and self-drilling-type pipe shed advance support method. The sectional grouting and self-drilling-type pipe shed advance support method comprises the steps that according to geological conditions of a tunnel construction area, construction parameters of a pipe shed are measured, and the tunnel surface is reinforced; drilling rig equipment and grouting machine equipment are mounted; a drill bit is mounted at the end of a first-section self-drilling-type drilling rod body andconnected with the drilling rig equipment, the drilling rig equipment is started, drilling is stopped after drilling operation of the first-section self-drilling-type drilling rod body is completed,and the grouting machine equipment conducts grouting on the section; after a previous-section self-drilling-type drilling rod body is grouted, a next-section self-drilling-type drilling rod body is connected, and grouting is conducted after drilling operation is completed; and the step is repeated till the pipe shed design length is reached. A slurry overflowing hole does not need to be formed ina self-drilling-type drilling rod, the strength and stiffness of the rod bodies are improved, the self-drilling-type drilling rod serves as a pipe shed steel pipe after drilling, and the drilling hole-forming problems under the adverse geological conditions are solved; and during advancing, sectional grouting and self-drilling-type pipe shed drilling are combined to improve the grouting effect.

The invention belongs to the technical field of optical fiber cables, and particularly relates to an optical fiber cable and a manufacturing method of the optical fiber cable. The optical fiber cablecomprises a steel strand main body and an optical cable part, wherein the steel strand main body and the optical cable part are connected through a hanging belt. According to the invention, the hanging belt, a steel strand hanging ring, a wavy hanging ring, an annular spring and a hanging connection port are arranged; when a polyethylene outer sheath of the optical fiber cable cracks, the steel strand main body can be prevented from being separated from the optical cable part under the action of the hanging belt, and the pulling of the optical cable part to the steel strand main body is buffered under the mutual cooperation of the wavy hanging ring and the annular spring, so that the self-supporting capacity is indirectly improved, and the problem of damage to the optical fiber cable is avoided; and by arranging the hanging connection port, when the surface of the optical fiber cable is connected and fixed, a hanging connection acting point can be provided through the hanging connection port, a worker can conveniently hang the optical fiber cable, and the erection difficulty is reduced.

The invention provides a gate-type roof brushing construction method of an extreme weak and broken surrounding rock layer. The gate-type roof brushing construction method of the extreme weak and broken surrounding rock layer comprises the following steps that S(1) a parallel pilot tunnel and a transverse channel are excavated by adopting a three-step method, and the parallel pilot tunnel and transverse channel support is constructed; S(2) a special-shaped gate-type supporting frame attached to a main hole outline is erected at a connecting position of the transverse channel and a main hole; S(3) a trapezoidal pilot tunnel of the main hole is excavated by adopting the three-step method along a hole top arc outline of the main hole in the width direction of the main hole, and temporary support is constructed on the trapezoidal pilot tunnel; S(4) primary support and secondary support are constructed on the trapezoidal pilot tunnel completing the temporary support; S(5) the main hole is excavated by adopting the three-step method separately facing the directions of large mileage and small mileage; and S(6) secondary lining is constructed on the main hole formed by the excavation. The gate-type roof brushing construction method of the extreme weak and broken surrounding rock layer can open up a new working surface, the special-shaped gate-type supporting frame used in the gate-typeroof brushing construction method improves the construction efficiency of a tunnel, and stress at the connecting position of the transverse channel and the main hole is intensified.

The invention discloses a supporting structure for rock roadbed heightening and a construction method. The structure comprises a rock roadbed, prestressed anchor cables, a connecting rod, a wall panel, a connecting rod and geogrids. The prestressed anchor cables are obliquely arranged in the rock roadbed, the wall panel is arranged at the top of a cantilever type retaining wall and connected withthe cantilever type retaining wall through the connecting rod; a plurality of layers of the geogrids and fillers are arranged on the rock roadbed on the inner side of the wall panel to form a heightened roadbed. The shear resistance and rigidity of the cantilever type retaining wall can be effectively improved by installing the prestressed anchor cables, so that the deformation of the vertical wall is effectively reduced, and the stability and the normal use of the cantilever type retaining wall are ensured. The mounting of the wall panel can effectively improve the use height of the cantilever type retaining wall, and can ensure the stability of the plurality of layers of the geogrids. The prestressed anchor cables and the geogrids belong to flexible structures and are high in shock resistance, an existing cantilever type retaining wall is not dismounted, and thus the manufacturing cost is reduced.

The invention discloses a subway interval construction method for utilizing a cantilever heading machine to downwards penetrate through a pedestrian passageway. The technologies of a cantilever heading machine, full cross section curtain grouting, advanced small pipe grouting and steel frame and reinforcing mesh fast splicing are utilized for performing construction; the cantilever heading machinecan be used for customizing different cutting teeth according to the hardness degree of surrounding rock, the tunnel face is intercepted and cut step by step according to an S-shaped intercepting andcutting path in the left and right circulation direction, the excavating and construction speed is high, and the construction progress is guaranteed; the effect of full cross section curtain groutinglies in water stopping and surrounding rock reinforcing, and the safety of construction is improved; the effect of advanced small pipe grouting lies in surrounding rock reinforcing, the self-bearingcapacity of the surrounding rock is improved, and surrounding rock deformation caused by tunnel construction is reduced; a steel frame and a reinforcing mesh are both prefabricated off-site; then an in-tunnel splicing or welding construction manner is adopted, the deformation time without supporting and protecting after surrounding rock excavation is shortened, so that surrounding rock deformationis controlled.

The invention provides a high self-supporting and rapid heat radiating type shielding suspension wire data cable, comprising cable cores and protection sleeves disposed at the outer walls of the cablecores. Two groups of cable cores are arranged in parallel. Outer walls of the cable cores are respectively sleeved with an insulation sleeve. The outer wall of the insulation sleeve is sleeved with an aluminum ring circle, and the protection sleeve sleeves the outer wall of the aluminum ring circle. Cable compound is filled between the insulation sleeve and the aluminum ring circle. Zinc-coated wire embedded in the protection sleeve is disposed between the aluminum ring circle and the protection sleeve. The invention is advantageous in that the structure is simple and design is reasonable; byadopting multiple protection sleeves and the built-in zinc-coated wires, high self-supporting force of the cable can be realized; the internal stability of the cable during practical use can be ensured, and practical elastic-plastic performance of the cable can be maintained; the effect is obvious and the cable is convenient for popularizing and using.