Cavern concrete spraying supporting structure

Abstract

The utility model discloses a cavern concrete spraying supporting structure which comprises a plurality of steel frames arranged along surrounding rock, net hanging mechanisms hung between the adjacent steel frames and a drainage mechanism. The drainage mechanism comprises a drainage guide pipe and a non-porous corrugated pipe in butt joint with the drainage guide pipe, and the non-porous corrugated pipe is arranged along the surrounding rock wall and extends to the bottom of the cavern. The mesh hanging mechanism comprises a reinforcing mesh and a plurality of reinforcing auxiliary meshes, the reinforcing mesh is formed by weaving in a criss-cross mode and connected to the steel frame, the reinforcing auxiliary meshes are hooked on the reinforcing mesh, and each reinforcing auxiliary mesh is provided with a plurality of barbs. According to the cavern concrete spraying supporting structure, dust is reduced through wet spraying operation, meanwhile, the adhesive capacity of concrete mixtures is enhanced by hanging the reinforcing mesh on the wall of the surrounding rock of the cavern before spraying, and therefore re-spraying operation is reduced, and construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and in particular relates to a cavern concrete spraying support structure. Background Art

[0002] Shotcrete support is a special concrete support method. Its raw materials are the same as ordinary concrete, but the construction process is different.

[0003] In the prior art, the construction methods of shotcrete include dry shotcrete, wet shotcrete and cement-coated sand shotcrete. In the dry shotcrete method, sand, cement and accelerator are mixed, transported to the nozzle with compressed air, and then sprayed after adding water and mixing; in the wet shotcrete method, sand, cement and water are mixed, then transported to the nozzle with compressed air or pump through a feed pipe, and the accelerator is accelerated at the nozzle and compressed air is used to replenish energy before spraying.

[0004] Shotcrete support can fill the uneven surface of tunnel surrounding rock formed by blasting, making it smooth and regular, avoiding stress concentration. At the same time, compared with traditional ordinary concrete, the thickness of shotcrete support can be reduced by 1 / 3 to 2 / 3, the excavation workload can be reduced by more than 15%, and the support materials can also be greatly reduced. At the same time, the support speed can be increased by 2 to 4 times, and the labor force can be saved by more than 50%.

[0005] However, the support structure formed by shotcrete also has obvious disadvantages. For example, in areas with abundant groundwater, the cavern is humid and prone to leakage, resulting in a large amount of rebound during the concrete spraying process. During the spraying process, due to the viscosity and fluidity of the concrete mixture, some concrete will not be able to adhere to the support surface after spraying, but will rebound. This not only wastes materials, but may also cause uneven support surfaces. On the other hand, there is a lot of dust. During the construction of shotcrete support, compressed air is needed to spray the concrete mixture onto the support surface, which will generate a lot of dust, which may affect the health of operators. Utility Model Content

[0006] The purpose of the utility model is to address the above-mentioned problems in the existing technology and to propose a cavern concrete spraying support structure. While using wet spraying to reduce dust, a steel mesh is hung on the cavern surrounding rock wall before spraying to enhance the adhesion of the concrete mixture, thereby reducing repeated spraying operations and improving construction efficiency.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is specifically as follows:

[0008] A cavern concrete spraying support structure comprises a plurality of steel frames arranged along the surrounding rock, a mesh hanging mechanism suspended between adjacent steel frames, and a drainage mechanism; the drainage mechanism comprises a drainage conduit, a non-porous corrugated pipe connected to the drainage conduit, and the non-porous corrugated pipe is arranged along the surrounding rock wall and extends to the bottom of the cavern; the mesh hanging mechanism comprises a steel mesh woven in a criss-cross pattern and connected to the steel frame, a plurality of steel auxiliary meshes hooked on the steel mesh, and each of the steel auxiliary meshes is provided with a plurality of barbs.

[0009] Furthermore, a plurality of drainage holes are arranged on the body of the drainage catheter, and the drainage holes are arranged at intervals.

[0010] Furthermore, the non-porous corrugated pipe is arc-shaped and matches the curvature of the surrounding rock wall of the cave.

[0011] Furthermore, the steel bar auxiliary mesh includes longitudinal steel bars and transverse steel bars, and the longitudinal steel bars and the transverse steel bars are welded and connected in the middle.

[0012] Furthermore, a limit hook is provided at the end of the longitudinal steel bar.

[0013] Furthermore, the barb comprises a plurality of blades arranged obliquely.

[0014] Compared with the prior art, the advantages of the utility model are: first, in addition to hanging the mesh between the surrounding rock steel frames of the cavern, the utility model also sets a drainage mechanism to drain the cavern in the water-rich area, so as to avoid the problem that the adhesion between the shotcrete and the rock mass is reduced due to water scouring during the shotcrete operation, thereby causing a large amount of rebound of the shotcrete, requiring multiple re-spraying operations, resulting in reduced operation efficiency and increased costs. At the same time, by hanging a layer of steel bar auxiliary mesh on the surface of the traditional steel bar mesh, the barbs on the steel bar auxiliary mesh are used to increase the adhesion between the shotcrete and the steel bar mesh, thereby improving the spraying effect and avoiding the occurrence of problems such as falling blocks and rebound. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The structure diagram of the cavern concrete spraying support structure provided by the utility model Figure 1 ;

[0017] Figure 2 The structure diagram of the cavern concrete spraying support structure provided by the utility model Figure 2 ;

[0018] Figure 3 The utility model provides a schematic structural diagram of the steel bar auxiliary mesh of the cavern concrete spraying support structure.

[0019] Figure numerals: 1. surrounding rock; 2. steel frame; 3. corrugated pipe without holes; 4. drainage duct; 5. steel mesh; 6. shotcrete; 7. longitudinal steel bars; 8. transverse steel bars; 9. barbs; 10. limit hook. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present utility model, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0023] In addition, the terms “first”, “second”, “third”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0027] like Figure 1-Figure 3 As shown, a cavern concrete spraying support structure comprises a plurality of steel frames 2 arranged along the surrounding rock 1, a mesh mechanism suspended between adjacent steel frames 2, and a drainage mechanism; the drainage mechanism comprises a drainage duct 4, a non-porous corrugated pipe 3 connected to the drainage duct 4, and the non-porous corrugated pipe 3 is arranged along the wall of the surrounding rock 1 and extends to the bottom of the cavern; the mesh mechanism comprises a steel mesh 5 woven in a criss-cross pattern and connected to the steel frame 2, a plurality of steel auxiliary meshes hooked on the steel mesh 5, and each of the steel auxiliary meshes is provided with a plurality of barbs 9.

[0028] Compared with the prior art, in the prior art, the sprayed concrete 6 technology is applied in the process of cavern construction. The sprayed concrete 6 is formed by loading the pre-prepared cement, sand, gravel, water and a certain amount of admixture into a sprayer, using high-pressure air to send it to the nozzle and mix it with the quick-setting agent, and then spraying it at a very high speed onto the surface of the rock or concrete. The sprayed concrete 6 has the following performance characteristics: fast strength growth, strong bonding force, high density, good impermeability, can better fill the cracks and recesses between the rock blocks, increase the integrity of the surrounding rock 1, prevent the weathering and loosening of the rock surface, and work together with the surrounding rock 1. The construction combines the conveying, pouring, and tamping processes into one, and no template is required, so the construction is fast and simple. It can play a bearing role as soon as possible. It can be final set in about 10 minutes, generally has strength after 2 hours, can reach 2MPa after 8 hours, can reach 5MPa after 16 hours, can reach 7-8MPa after 1 day, and can reach about 70% of the strength of 28 days in 4 days. However, in water-rich areas, fissure water is prone to occur, and due to the flow and scouring of water flow, the bonding performance of concrete and rock mass is poor, resulting in poor integrity of the initial sprayed concrete. Even after multiple supplementary spraying, local gaps may still exist. In the present utility model, by providing a drainage duct 4 and a non-porous corrugated pipe 3 connected to the drainage duct 4, the drainage duct 4 is inserted into the water gushing point or the water seepage point, and the water outlet is drained to the non-porous corrugated pipe 3 and discharged to the bottom of the cavern, which can effectively reduce the problems of decreased bonding performance and incomplete concrete caused by water flow scouring during spraying concrete 6. In addition, multiple steel bar auxiliary nets are provided, and the barbs 9 on the steel bar auxiliary nets are used to increase the bonding performance of the sprayed concrete 6, avoid problems such as falling blocks, and thus effectively improve the integrity of the overall sprayed concrete 6.

[0029] The drainage conduit 4 is provided with a plurality of drainage holes, and the drainage holes are arranged at intervals. The plurality of drainage holes can effectively collect the flowing water at the water gushing point, so as to avoid the water flow from scouring the sprayed concrete 6 and ensure the integrity of the sprayed concrete 6.

[0030] The non-porous corrugated pipe 3 is arc-shaped and matches the curvature of the rock wall of the cave surrounding rock 1. The water flow is backflowed through the non-porous corrugated pipe 3 and discharged to the bottom of the cave, avoiding the scouring effect of the water flow.

[0031] The steel bar auxiliary net includes longitudinal steel bars 7 and transverse steel bars 8, and the longitudinal steel bars 7 and the transverse steel bars 8 are welded in the middle. A limit hook 10 is provided at the end of the longitudinal steel bar 7. The longitudinal steel bars 7 and the transverse steel bars 8 can be made of on-site construction waste, thereby reducing costs. The barbs 9 include a plurality of inclined blades, and the barbs 9 are used to enhance the bonding performance. In the later spraying operation, the spraying operation is adopted from bottom to top.

[0032] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cavern concrete spraying support structure, characterized in that: The invention comprises a plurality of steel frames (2) arranged along the surrounding rock (1), a mesh hanging mechanism suspended between adjacent steel frames (2), and a drainage mechanism; the drainage mechanism comprises a drainage conduit (4), a non-porous corrugated pipe (3) connected to the drainage conduit (4), and the non-porous corrugated pipe (3) is arranged along the wall of the surrounding rock (1) and extends to the bottom of the cave; the mesh hanging mechanism comprises a steel mesh (5) woven in a criss-cross pattern and connected to the steel frame (2), a plurality of steel auxiliary meshes hooked on the steel mesh (5), and each of the steel auxiliary meshes is provided with a plurality of barbs (9).

2. The cavern concrete spraying support structure according to claim 1 is characterized in that: The body of the drainage catheter (4) is provided with a plurality of drainage holes, and the drainage holes are arranged at intervals.

3. The cavern concrete spraying support structure according to claim 1 is characterized in that: The non-porous corrugated pipe (3) is arc-shaped and matches the curvature of the rock wall of the cave surrounding rock (1).

4. The cavern concrete spraying support structure according to claim 1 is characterized in that: The steel bar auxiliary mesh comprises longitudinal steel bars (7) and transverse steel bars (8), and the longitudinal steel bars (7) and the transverse steel bars (8) are welded in the middle.

5. The cavern concrete spraying support structure according to claim 4 is characterized in that: A limit hook (10) is provided at the end of the longitudinal steel bar (7).

6. The cavern concrete spraying support structure according to claim 1 is characterized in that: The barb (9) comprises a plurality of blades arranged obliquely.

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