A tunnel construction method using corrugated steel and shotcrete support

Abstract

The corrugated steel-sprayed concrete support for the initial support of the tunnel constructed by the concealed excavation method belongs to the field of tunnel construction technology. In order to solve the problems of the existing precast concrete lining being inconvenient to transport and carry, difficult to lay, poor waterproofing effect, and easy to seep water, it includes a supporting beam and a supporting structure arranged on both sides of the supporting beam. A protruding block is fixedly installed at one end of the beam body, and an extension structure is welded and installed on both sides of the beam body to connect the supporting bedrock. The two groups of beam bodies are connected by tying steel bars to facilitate stabilization. A concrete structure is laid in the gap between the lower corrugated steel and the upper corrugated steel, and grouting is performed between the outside of the corrugated steel and the soil to ensure that the corrugated steel is evenly stressed. The corrugated steel is light in weight and does not require special machinery. At the same time, the assembly speed is fast, which can greatly shorten the construction period. At the same time, concrete is sprayed on the corrugated steel to form a corrugated steel-concrete composite structure, which can further improve the bearing capacity and rigidity of the device.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to corrugated steel-shotcrete support for initial support of a tunnel constructed by a dark excavation method. Background Art

[0002] A tunnel is a structure built underground, underwater or in a mountain for laying railways or building roads for motor vehicles to pass through. According to their location, they can be divided into three categories: mountain tunnels, underwater tunnels and urban tunnels. Mountain tunnels are those that pass under mountains or hills to shorten the distance and avoid steep slopes; underwater tunnels are those that pass under rivers or seabeds to cross rivers or straits; urban tunnels are those that pass underground in cities to meet the needs of railways passing through large cities. Mountain tunnels are the most commonly built of the three types of tunnels.

[0003] Patent document CN201911232128.X discloses a high-stress tunnel combined ring beam support structure, including a tunnel and a support ring body, wherein a homogeneous and isotropic support ring body is constructed around the tunnel, and the support ring body includes a grouting anchor rod, a pull-out anchor rod, a U-shaped steel bracket, a wire rope net and a concrete shotcrete layer; a first layer of concrete shotcrete layer is formed on the inner surface of the tunnel by shotcrete, and radially evenly arranged grouting anchor rods are punched on the concrete shotcrete layer, and the grouting anchor rods include long grouting anchor rods and short grouting anchor rods; after the short grouting anchor rods are injected with silicate cement-water glass material, an internal grouting reinforcement waterproof ring is formed in the surrounding rock of the shallow loose damage zone of the tunnel, and a second support ring layer is formed after the reinforcement waterproof ring solidifies; after the long grouting anchor rods are injected with high-pressure concrete slurry, an external grouting reinforcement ring is formed in the surrounding rock of the deep incomplete damage zone of the tunnel , the external grouting reinforcement ring forms the third support ring layer after solidification; radially evenly arranged pull-out anchors are driven on the inner surface of the first layer of concrete shotcrete layer in the tunnel, the pull-out anchors are connected to anchor pressure plates, a wire rope net is pressed under the anchor pressure plates, and the multi-layered strong concrete shotcrete layer structure with high density and rock surface is sprayed and evenly bonded to form the fourth support ring layer; U-shaped steel brackets are arranged on the surface of the fourth support ring layer, and the U-shaped steel brackets form the fifth support ring layer. Multiple support ring layers together constitute the support ring structure of the support system, forming an internal bearing support structure for the tunnel. Although the support structure mentioned in this patent has enhanced bearing capacity, it is an integral structure, which is not convenient for transportation and handling, and has high laying difficulty. In addition, traditional support structures are mostly paved with concrete structures, the surface is prone to cracking, the waterproof effect is poor, it is easy to seep water, and the use effect is not good.

[0004] In view of the above problems, the existing device was improved and the corrugated steel-shotcrete support for the initial support of the tunnel was proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a corrugated steel-sprayed concrete support for the initial support of a tunnel constructed by a dark excavation method. Two groups of beam bodies are installed end to end, and the protruding blocks are inserted into the embedded grooves to achieve a positioning effect. The two groups of beam bodies are connected by tying steel bars to facilitate stabilization. The supporting beams are extended according to the depth of tunnel excavation. When the supporting beams are extended to a certain length, they are fixedly connected to the top of the tunnel by spraying concrete. Grouting anchor rods are installed through the surface of the supporting bedrock, and the grouting anchor rods are used to grout concrete inside the supporting structure, which also strengthens The strength of the device is improved. The lower corrugated steel and the upper corrugated steel are connected through a screw rod. The upper and lower ends of the screw rod are threaded with threaded sleeves. A concrete structure is laid in the gap between the lower corrugated steel and the upper corrugated steel. Grouting is performed between the outside of the corrugated steel and the soil to ensure that the corrugated steel is evenly stressed. The corrugated steel is light in weight and does not require special machinery. At the same time, the assembly speed is fast, which can greatly shorten the construction period. At the same time, concrete is sprayed on the corrugated steel to form a corrugated steel-concrete composite structure, which can further improve the bearing capacity and rigidity of the device and solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a corrugated steel-sprayed concrete support for initial support of a tunnel constructed by a dark excavation method, comprising a support beam and a support structure arranged on both sides of the support beam, a lining structure is fixedly installed on the inner wall of the support structure, a tunnel bottom bedrock is fixedly installed on the lower end of the support structure, tunnel side ditches are fixedly installed on both sides of the tunnel bottom bedrock, a drainage channel is opened on the upper surface of the tunnel side ditches, and a support mechanism is movably installed at the end of the support beam;

[0007] The supporting beam includes a beam body and a limiting sliding rod fixedly installed at the lower end of the beam body. A protruding block is fixedly installed at one end of the beam body. The protruding block is a hollow structure. Extension structures are welded and installed on both sides of the beam body. An embedded groove matching the protruding block is opened at one end of the beam body away from the protruding block. Bundled steel bars are installed through the inside of the embedded groove. A concrete pouring port is opened inside the limiting sliding rod.

[0008] Furthermore, the supporting structure includes a base and a supporting bedrock laid on the upper end of the base, and a grouting anchor rod is installed through the surface of the supporting bedrock.

[0009] Furthermore, the lining structure includes lining concrete and a sliding opening opened at the upper end of the lining concrete, and the sliding opening matches the limiting sliding rod.

[0010] Furthermore, the extension structure includes an extension steel rod and a propulsion chamber opened inside the extension steel rod, and propulsion blocks are movably penetrated at both upper and lower ends of the extension steel rod, and an extrusion block is arranged inside the propulsion chamber.

[0011] Furthermore, a conical block is fixedly installed on one side of the extrusion block close to the propulsion block, and a push rod penetrating the interior of the propulsion chamber is fixedly installed on the central part of the extrusion block.

[0012] Furthermore, an arc block is fixedly installed on the upper end of the propulsion block, an inclined block matching the side wall of the conical block is fixedly installed on the side of the propulsion block away from the arc block, and a limit block is fixedly installed on the outer surface of the inclined block.

[0013] Furthermore, the supporting mechanism includes a movable structure movably mounted on the lower end of the limiting sliding rod and a supporting plate hingedly mounted on the lower end of the movable structure, a baffle is fixedly mounted on the other end of the supporting plate, a supporting column is fixedly mounted on the lower end of the baffle, and a stabilizing plate is movably mounted on the lower end of the supporting column.

[0014] Furthermore, the movable structure includes a slide rail and a slide groove opened on the upper surface of the slide rail, the slide groove matches the limit sliding rod, a slide sleeve is fixedly installed on the upper end of the slide rail, and a slide rod matching the concrete pouring port is arranged inside the slide sleeve.

[0015] Furthermore, the lining concrete includes a lower corrugated steel and an upper corrugated steel arranged on the upper end of the lower corrugated steel. The lower corrugated steel and the upper corrugated steel are connected through a screw rod. The upper and lower ends of the screw rod are threadedly installed with a threaded sleeve. A concrete structure is laid in the gap between the lower corrugated steel and the upper corrugated steel.

[0016] Furthermore, the supporting bedrock includes a broken plate and an avoidance hole opened in the inner cavity of the broken plate. The upper and lower ends of the inner cavity of the avoidance hole are provided with sockets matching the propulsion block, and the inside of the avoidance hole is movably installed with a plug block matching the propulsion chamber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention proposes a corrugated steel-shotcrete support for initial support of a tunnel constructed by a concealed excavation method. A protruding block is fixedly installed at one end of the beam body. The protruding block is a hollow structure. Extension structures are welded and installed on both sides of the beam body for connecting with the supporting bedrock. An embedded groove matching the protruding block is provided at one end of the beam body away from the protruding block. The interior of the embedded groove is penetrated by a bundle of steel bars. A concrete pouring port is provided inside the limit sliding rod. Two groups of beam bodies are butt-jointed end to end. The protruding block is inserted into the embedded groove to achieve a positioning effect. The two groups of beam bodies are connected by using the bundle of steel bars to facilitate stabilization. The supporting beam is extended according to the depth of tunnel excavation. When the supporting beam is extended to a certain length After that, it is fixedly connected to the top of the tunnel by spraying concrete. Grouting anchors are installed through the surface of the supporting bedrock. The grouting anchors are used to grout concrete inside the supporting structure, which also enhances the strength of the device. The lower corrugated steel and the upper corrugated steel are connected through screws. Threaded sleeves are threaded at the upper and lower ends of the screws. A concrete structure is laid in the gap between the lower corrugated steel and the upper corrugated steel. Grouting is performed between the outside of the corrugated steel and the soil to ensure that the corrugated steel is evenly stressed. The corrugated steel is light in weight, does not require special machinery, and has a fast assembly speed, which can greatly shorten the construction period. At the same time, concrete is sprayed on the corrugated steel to form a corrugated steel-concrete composite structure, which can further improve the bearing capacity and rigidity of the device.

[0019] 2. The present invention proposes a corrugated steel-sprayed concrete support for the initial support of a tunnel constructed by a dark excavation method. A baffle is fixedly installed at one end of the support plate, a support column is fixedly installed at the lower end of the baffle, a stabilizing plate is movably installed at the lower end of the support column, and a movable structure includes a slide rail and a slide groove provided on the upper surface of the slide rail. The slide groove matches the limit sliding rod. A slide sleeve is fixedly installed at the upper end of the slide rail. A slide rod matching the concrete pouring port is arranged inside the slide sleeve. After the tunnel is excavated to a certain depth, the slide groove is matched with the limit sliding rod, and the slide rod is inserted into the concrete pouring port to adjust the concrete pouring port at the end. Blocking is carried out to prevent overflow of material. At the same time, the end of the support plate close to the stabilizing plate is installed at an angle to the ground. The support plate and the tunnel form a triangular structure. Another set of support beams is placed on the upper end of the support plate. The side of the support beam close to the protruding block is limited by the baffle. After the tunnel is excavated deeper, the support plate is lifted upward so that the support plate and the slide rail are placed parallel. At this time, the uninstalled support beams are docked with the installed set of support beams, and are pushed toward the installed set of support beams until the two sets are docked. The assembly is relatively simple.

[0020] 3. The corrugated steel-sprayed concrete support for initial support of a tunnel constructed by a concealed excavation method proposed in the present invention comprises an arc block fixedly installed on the upper end of the push block, an inclined block matching the side wall of the conical block fixedly installed on the side of the push block away from the arc block, a limit block fixedly installed on the outer surface of the inclined block, the supporting bedrock comprises a broken plate and an avoidance hole opened in the inner cavity of the broken plate, plug holes matching the push block are opened at the upper and lower ends of the inner cavity of the avoidance hole, a plug block matching the push chamber is movably installed inside the avoidance hole, a side of the broken plate close to the plug block is inserted into the interior of the push chamber, the plug block and the extrusion block move inwardly, a conical block fixedly installed on one side of the extrusion block contacts the inclined block, and drives the inclined block to be expelled outwardly until the push block is inserted into the interior of the plug hole, that is, the extended steel rod and the broken plate can be spliced, the operation is simple, and then concrete is sprayed into the interior of the push chamber to facilitate strengthening the strength of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the corrugated steel-sprayed concrete support for the initial support of the tunnel constructed by the dark excavation method of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation structure of the lining structure of the initial support corrugated steel-sprayed concrete support of the tunnel constructed by the dark excavation method of the present invention;

[0023] Figure 3 This is a schematic diagram of the supporting beam structure of the corrugated steel-shotcrete support for the initial support of the tunnel constructed by the dark excavation method of the present invention;

[0024] Figure 4 It is a side view of the supporting beam of the corrugated steel-sprayed concrete support for the initial support of the tunnel constructed by the dark excavation method of the present invention;

[0025] Figure 5 This is a schematic diagram of the supporting mechanism structure of the corrugated steel-shotcrete support for the initial support of the tunnel constructed by the dark excavation method of the present invention;

[0026] Figure 6 This is a diagram of the state after the support mechanism of the corrugated steel-sprayed concrete support for the initial support of the tunnel constructed by the dark excavation method of the present invention is extended;

[0027] Figure 7 It is a schematic diagram of the mobile structure of the corrugated steel-sprayed concrete support for the initial support of the tunnel constructed by the dark excavation method of the present invention;

[0028] Figure 8 This is a schematic diagram of the lining concrete structure of the initial support corrugated steel-shotcrete support of the tunnel constructed by the dark excavation method of the present invention;

[0029] Fig. 9 This is a schematic diagram of the supporting bedrock structure of the initial support corrugated steel-shotcrete support of the tunnel constructed by the dark excavation method of the present invention.

[0030] In the figure: 1. Support beam; 11. Beam body; 12. Limiting sliding rod; 13. Protruding block; 14. Extension structure; 141. Extension steel rod; 142. Propelling chamber; 143. Propelling block; 1431. Arc block; 1432. Oblique block; 1433. Limiting block; 144. Extrusion block; 145. Cone block; 146. Push rod; 15. Embedded groove; 16. Bundling steel bars; 17. Concrete pouring port; 2. Support structure; 21. Base; 22. Support bedrock; 221. Broken plate; 222. Avoidance hole; 223. Plug hole; 224. Plug block; 23. Grouting anchor rod; 3. Lining structure; 31. Lining concrete; 311. Lower corrugated steel; 312. Upper corrugated steel; 313. Screw; 314. Threaded sleeve; 315. Concrete structure; 32. Slide; 4. Tunnel bottom bedrock; 5. Tunnel side ditch; 6. Drainage outlet; 7. Support mechanism; 71. Moving structure; 711. Slide rail; 712. Slide chute; 713. Slide sleeve; 714. Slide rod; 72. Support plate; 73. Baffle; 74. Support column; 75. Stabilizing plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 and Figure 5 The initial support of the tunnel constructed by the dark excavation method is a corrugated steel-shotcrete support, which includes a supporting beam 1 and a supporting structure 2 arranged on both sides of the supporting beam 1. A lining structure 3 is fixedly installed on the inner wall of the supporting structure 2, and a tunnel bottom bedrock 4 is fixedly installed on the lower end of the supporting structure 2. Tunnel side ditches 5 are fixedly installed on both sides of the tunnel bottom bedrock 4. A drainage outlet 6 is opened on the upper surface of the tunnel side ditch 5 for drainage. A supporting mechanism 7 is movably installed at the end of the supporting beam 1. Every time a certain length of the tunnel is excavated, the supporting mechanism 7 supports the end.

[0033] See also Figure 3 and Figure 4The supporting crossbeam 1 comprises a crossbeam body 11 and a limiting sliding rod 12 fixedly installed at the lower end of the crossbeam body 11. A protruding block 13 is fixedly installed at one end of the crossbeam body 11. The protruding block 13 is a hollow structure. Extension structures 14 are welded and installed on both sides of the crossbeam body 11 for connecting the supporting bedrock 22. An embedded groove 15 matching the protruding block 13 is provided at one end of the crossbeam body 11 away from the protruding block 13. A binding steel bar 16 is installed through the embedded groove 15. A concrete pouring port 17 is provided inside the limiting sliding rod 12. Two groups of crossbeam bodies 11 are butt-jointed and installed end to end. The protruding block 13 is inserted into the embedded groove 15 to achieve a positioning effect. The two groups of crossbeam bodies 11 are connected by binding steel bars 16 to facilitate stabilization. The supporting crossbeam 1 is extended according to the depth of tunnel excavation. When the supporting crossbeam 1 is extended to a certain length, concrete is sprayed to fix it to the top of the tunnel.

[0034] See also Figure 2 The support structure 2 includes a base 21 and a support bedrock 22 laid on the upper end of the base 21. Grouting anchor rods 23 are installed through the surface of the support bedrock 22. The grouting anchor rods 23 are used to grout concrete inside the support structure 2, which also enhances the strength of the device.

[0035] The lining structure 3 includes a lining concrete 31 and a sliding opening 32 opened at the upper end of the lining concrete 31. The sliding opening 32 matches the limiting sliding rod 12. The limiting sliding rod 12 is used to isolate the lining concrete 31 at both ends of the lining to prevent water corrosion. At the same time, the protrusions on both sides of the lower end can support the device. A concrete structure 315 is laid in the gap between the lower corrugated steel 311 and the upper corrugated steel 312. Grouting is performed between the outside of the corrugated steel and the soil to ensure that the corrugated steel is evenly stressed. The corrugated steel itself has good waterproof performance, and after spraying concrete, the waterproof performance can be further enhanced.

[0036] See also Figure 4 and Fig. 9The extension structure 14 includes an extension steel rod 141 and a propulsion chamber 142 opened inside the extension steel rod 141. The upper and lower ends of the extension steel rod 141 are movably penetrated with propulsion blocks 143. The interior of the propulsion chamber 142 is provided with an extrusion block 144. A conical block 145 is fixedly installed on the side of the extrusion block 144 close to the propulsion block 143. A push rod 146 is fixedly installed in the center of the extrusion block 144 and penetrates the interior of the propulsion chamber 142. An arc block 1431 is fixedly installed on the upper end of the propulsion block 143. The propulsion block 143 A slanted block 1432 matching the side wall of the conical block 145 is fixedly installed on the side away from the arc block 1431, and a limit block 1433 is fixedly installed on the outer surface of the slanted block 1432. The supporting bedrock 22 includes a broken plate 221 and an avoidance hole 222 opened in the inner cavity of the broken plate 221. The upper and lower ends of the inner cavity of the avoidance hole 222 are provided with plug holes 223 matching the propulsion block 143. The inside of the avoidance hole 222 is movably installed with an insert block 224 matching the propulsion chamber 142. The side of the plate 221 close to the plug block 224 is inserted into the interior of the propulsion chamber 142, and the plug block 224 and the extrusion block 144 move inward. The conical block 145 fixedly installed on one side of the extrusion block 144 contacts the inclined block 1432 and drives the inclined block 1432 to be expelled outward until the propulsion block 143 is inserted into the interior of the socket 223. That is, the extended steel rod 141 and the broken plate 221 can be spliced, and the operation is simple. Then, concrete is sprayed into the interior of the propulsion chamber 142 to enhance the strength of the connection.

[0037] See also Figure 5 , Figure 6 and Figure 7The supporting mechanism 7 comprises a mobile structure 71 movably mounted at the lower end of the limit sliding rod 12 and a supporting plate 72 hingedly mounted at the lower end of the mobile structure 71. A baffle 73 is fixedly mounted at the other end of the supporting plate 72. A supporting column 74 is fixedly mounted at the lower end of the baffle 73. A stabilizing plate 75 is movably mounted at the lower end of the supporting column 74. The mobile structure 71 comprises a slide rail 711 and a slide groove 712 provided on the upper surface of the slide rail 711. The slide groove 712 matches the limit sliding rod 12. A sliding sleeve 713 is fixedly mounted at the upper end of the slide rail 711. A sliding rod 714 matching the concrete pouring port 17 is arranged inside the sliding sleeve 713. After the tunnel is excavated to a certain depth, the slide groove 712 is matched with the limit sliding rod 12. The slide rod 7 14 is inserted into the concrete pouring port 17 to block the concrete pouring port 17 at the end to prevent overflow. At the same time, the end of the support plate 72 close to the stabilizing plate 75 is installed obliquely with the ground. The support plate 72 and the tunnel form a triangular structure. Another group of support beams 1 are placed on the upper end of the support plate 72. The side of the support beam 1 close to the protruding block 13 is limited by the baffle 73. After the tunnel is excavated deeper, the support plate 72 is lifted upward so that the support plate 72 is placed parallel to the slide rail 711. At this time, the uninstalled support beam 1 is in a docking state with the installed group of support beams 1, and is pushed toward the installed group of support beams 1 until the two groups are docked. The assembly is relatively simple.

[0038] See also Figure 8 The lining concrete 31 includes a lower corrugated steel 311 and an upper corrugated steel 312 arranged at the upper end of the lower corrugated steel 311. The lower corrugated steel 311 and the upper corrugated steel 312 are connected through a screw 313. The upper and lower ends of the screw 313 are threadedly installed with a threaded sleeve 314. A concrete structure 315 is laid in the gap between the lower corrugated steel 311 and the upper corrugated steel 312. Grouting is performed between the outside of the corrugated steel and the soil to ensure that the corrugated steel is uniformly stressed. The corrugated steel is light in weight and does not require special machinery. At the same time, the assembly speed is fast, which can greatly shorten the construction period. At the same time, concrete is sprayed on the corrugated steel to form a corrugated steel-concrete composite structure, which can further improve the bearing capacity and rigidity of the device.

[0039] Working principle: concrete structure 315 is laid in the gap between lower corrugated steel 311 and upper corrugated steel 312, upper corrugated steel 312 is close to supporting bedrock 22, and there is a certain gap between them, broken plate 221 is inserted into supporting bedrock 22, and its side close to plug block 224 is inserted into the inside of propulsion chamber 142, plug block 224 and extrusion block 144 move inward, and conical block 145 fixedly installed on one side of extrusion block 144 contacts inclined block 1432, and drives inclined block 1432 to be extruded outward, until propulsion block 143 is inserted into socket 223 The interior of the tunnel, that is, the extended steel rod 141 and the broken plate 221 can be spliced, and then concrete is sprayed into the advancement chamber 142, and at the same time, concrete is sprayed into the space between the upper corrugated steel 312 and the supporting bedrock 22. After the tunnel is excavated to a certain depth, the slide groove 712 is matched with the limit sliding rod 12, and the sliding rod 714 is inserted into the concrete pouring port 17 to block the concrete pouring port 17 at the end. At the same time, the end of the support plate 72 close to the stabilizing plate 75 is installed at an angle to the ground, and the support plate 72 and the tunnel form a triangular structure. , place another group of supporting beams 1 on the upper end of the supporting plate 72, and the side of the supporting beam 1 close to the protruding block 13 is limited by the baffle 73. After the tunnel is excavated deeper, lift the supporting plate 72 upward so that the supporting plate 72 is placed parallel to the slide rail 711. At this time, the uninstalled supporting beam 1 is in a docking state with the installed group of supporting beams 1, and is pushed toward the installed group of supporting beams 1. The two groups of beam bodies 11 are docked end to end, and the protruding block 13 is inserted into the embedded groove 15 to play a positioning effect. The two groups of beam bodies 11 are connected by tying steel bars 16, and the supporting beam 1 is extended according to the depth of tunnel excavation. When the supporting beam 1 is extended to a certain length, it is fixedly connected to the top of the tunnel by spraying concrete.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A corrugated steel-shotcrete support for initial support of a tunnel constructed by a dark excavation method, comprising a support beam (1) and a support structure (2) arranged on both sides of the support beam (1), characterized in that: A lining structure (3) is fixedly installed on the inner wall of the support structure (2), a tunnel bedrock (4) is fixedly installed on the lower end of the support structure (2), tunnel side ditches (5) are fixedly installed on both sides of the tunnel bedrock (4), a drainage channel (6) is opened on the upper surface of the tunnel side ditches (5), and a support mechanism (7) is movably installed at the end of the supporting crossbeam (1); The supporting crossbeam (1) comprises a crossbeam body (11) and a limit sliding rod (12) fixedly mounted at the lower end of the crossbeam body (11); a protruding block (13) is fixedly mounted at one end of the crossbeam body (11); the protruding block (13) is hollow in structure; extension structures (14) are welded and mounted on both sides of the crossbeam body (11); an inner groove (15) matching the protruding block (13) is formed at one end of the crossbeam body (11) away from the protruding block (13); a bundled steel bar (16) is installed through the inner groove (15); and a concrete pouring port (17) is formed inside the limit sliding rod (12); The support structure (2) comprises a base (21) and a support bedrock (22) laid on the upper end of the base (21), and a grouting anchor rod (23) is installed through the surface of the support bedrock (22); The lining structure (3) comprises lining concrete (31) and a sliding opening (32) opened at the upper end of the lining concrete (31), wherein the sliding opening (32) matches the limiting sliding rod (12); The extension structure (14) comprises an extension steel rod (141) and a propulsion chamber (142) provided inside the extension steel rod (141); propulsion blocks (143) are movably penetrated at both upper and lower ends of the extension steel rod (141); and an extrusion block (144) is provided inside the propulsion chamber (142); The support mechanism (7) comprises a moving structure (71) movably mounted on the lower end of the limit sliding rod (12) and a support plate (72) hingedly mounted on the lower end of the moving structure (71); a baffle (73) is fixedly mounted on the other end of the support plate (72); a support column (74) is fixedly mounted on the lower end of the baffle (73); and a stabilizing plate (75) is movably mounted on the lower end of the support column (74); The lining concrete (31) comprises a lower corrugated steel (311) and an upper corrugated steel (312) arranged at the upper end of the lower corrugated steel (311); the lower corrugated steel (311) and the upper corrugated steel (312) are connected through a screw rod (313); threaded sleeves (314) are threadedly installed at both upper and lower ends of the screw rod (313); and a concrete structure (315) is laid in the gap between the lower corrugated steel (311) and the upper corrugated steel (312).

2. The corrugated steel-shotcrete support for initial support of a tunnel constructed by the dark excavation method as claimed in claim 1, characterized in that: A conical block (145) is fixedly mounted on one side of the extrusion block (144) close to the propulsion block (143), and a push rod (146) is fixedly mounted on the central portion of the extrusion block (144) and is installed to penetrate the interior of the propulsion chamber (142).

3. The corrugated steel-shotcrete support for initial support of a tunnel constructed by the dark excavation method as claimed in claim 2, characterized in that: An arc block (1431) is fixedly mounted on the upper end of the propulsion block (143), an inclined block (1432) matching the side wall of the conical block (145) is fixedly mounted on the side of the propulsion block (1433) away from the arc block (1431), and a limit block (1433) is fixedly mounted on the outer surface of the inclined block (1432).

4. The corrugated steel-shotcrete support for initial support of a tunnel constructed by the dark excavation method as claimed in claim 1, characterized in that: The movable structure (71) comprises a slide rail (711) and a slide groove (712) provided on the upper surface of the slide rail (711); the slide groove (712) matches the limit sliding rod (12); a slide sleeve (713) is fixedly mounted on the upper end of the slide rail (711); and a slide rod (714) matching the concrete pouring port (17) is provided inside the slide sleeve (713).

5. The corrugated steel-shotcrete support for initial support of a tunnel constructed by the dark excavation method as claimed in claim 3, characterized in that: The supporting bedrock (22) comprises a broken plate (221) and an avoidance hole (222) provided in the inner cavity of the broken plate (221); the upper and lower ends of the inner cavity of the avoidance hole (222) are provided with plug holes (223) matching the propulsion block (143); and an insert block (224) matching the propulsion chamber (142) is movably installed inside the avoidance hole (222).

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