Spatial structure and construction method based on combined support of asphalt concrete and corrugated steel

Abstract

The present invention discloses a spatial structure and construction method based on the combined support of asphalt concrete and corrugated steel, and relates to the technical field of reinforcement and sealing of underground tunnel chambers. The present invention includes basic support, a sealing and drainage structure, a fastening structure, and an inner lining support structure. The basic support is composed of grouting of the surrounding rock of the supported coal mine tunnel, an anchor net, and an anchor cable. The sealing and drainage structure is composed of large-pore open-graded drainage asphalt concrete, a water filter flower pipe, and a dense-graded asphalt concrete. The present invention can effectively utilize the original support structure of the mine tunnel and adapt to the high surrounding rock pressure environment underground; the present invention can meet the needs of sealing space and discharging surrounding rock fissure water through a composite structure of large-pore open-graded drainage asphalt concrete and dense-graded asphalt concrete; the spatial structure based on the combined support of asphalt concrete and corrugated steel is applied to retired coal mines and the retired coal mines are built into pumped storage power stations or compressed air energy storage power stations.

Description

Technical Field

[0001] The present invention relates to the technical field of reinforcement and sealing of underground tunnel chambers, and in particular to a spatial structure based on combined support of asphalt concrete and corrugated steel and a construction method. Background Art

[0002] With my country's carbon peak and carbon neutrality goals, as well as the need to build a clean, low-carbon, safe, and efficient energy system and a power system dominated by clean energy, new energy is poised for rapid development. To promote new energy consumption, enhance system regulation capabilities, and maintain stable operation, a large number of clean energy storage facilities are needed.

[0003] Pumped-storage power stations are currently recognized as the most technologically mature and economical peak-shaving and large-scale energy storage power source. Compressed air energy storage technology, which uses compressed air as the energy storage medium, is environmentally friendly, requires minimal geographical conditions, offers large storage capacity, is technically reliable, and has a long operating life. It represents a highly promising development area in the large-scale energy storage sector. Furthermore, due to adjustments in national energy policies or the depletion of coal resources, many coal mines are currently or will soon be closing or decommissioning. These mine closures leave behind vast underground resources. Developing and utilizing this underground space to construct pumped-storage power stations or compressed air energy storage plants can not only reduce resource waste but also transform waste into valuable resources, increasing the utilization rate of mine resources and providing a path for closed mines to transition out of poverty and achieve sustainable development.

[0004] To date, there are no examples in China of projects where pumped-storage power stations or compressed air energy storage power stations have been built in coal mines that have been decommissioned. The reinforcement and sealing technology of mine tunnels, which serve as reservoirs for pumped-storage power stations or gas storage systems for compressed air energy storage power stations, is one of the main challenges restricting the use of decommissioned mines to build energy storage power stations. This technology provides a reinforcement and sealing solution that can adapt to high surrounding rock pressure, high water pressure, and cyclical changes in tunnel pressure underground, improving the stability and sealing of the reconstructed space, while reducing project costs and extending service life. Therefore, it is necessary to propose a spatial structure and construction method based on the combined support of asphalt concrete and corrugated steel to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a spatial structure and construction method based on the combined support of asphalt concrete and corrugated steel to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spatial structure based on the combined support of asphalt concrete and corrugated steel, including basic support, sealing drainage structure, fastening structure and lining support structure, the basic support is composed of grouting of the supported coal mine tunnel surrounding rock, anchor net and anchor cable, the sealing drainage structure is composed of large-pore open-graded drainage asphalt concrete, water filter flower pipe and dense-graded asphalt concrete, the fastening structure is a short anchor rod with a hook, the fastening structure fixes the sealing drainage structure on the surrounding rock, the lining support structure is a corrugated steel lining, and the lining support structure provides support force for large-pore open-graded drainage asphalt concrete and dense-graded asphalt concrete.

[0007] Preferably, before the construction of the sealing drainage structure, an adhesive is applied to the surrounding rock of the coal mine tunnel to bond the large-pore open-graded drainage asphalt concrete to the basic support.

[0008] Preferably, the drainage flower pipes are arranged in large-pore open-graded drainage asphalt concrete, and the drainage flower pipes are made of deformation-resistant and corrosion-resistant materials, and are filled with erosion-resistant and water-permeable coarse aggregate materials.

[0009] The present invention also discloses a construction method for a spatial structure based on combined support of asphalt concrete and corrugated steel, comprising any of the above-described spatial structures based on combined support of asphalt concrete and corrugated steel, and further comprising the following steps:

[0010] S1: Evaluate the original support structure on the original roadway. If the original basic support can ensure the safety and stability of the original roadway, the original support structure will be used as the basic support. If the original basic support is not sufficient to ensure the safety and stability of the original roadway, the original roadway will be supplemented with anchor rods and anchor cables, or the original roadway will be repaired and the anchor net support structure will be re-constructed;

[0011] S2: After the basic support is completed, the fastening structure is pre-constructed according to the surrounding rock conditions, water gushing conditions, tunnel section and basic support method. The fastening structure uses short anchor rods with curved hooks to tighten and fix the sealing and drainage structure to the surrounding rock;

[0012] S3: After applying adhesive to the surface of the tunnel surrounding rock, support structure, and fastening structure, lay large-pore open-graded drainage asphalt concrete as a sealing and drainage structure. Based on the water outflow from the surrounding rock fissures, arrange an appropriate number of drainage pipes at reasonable locations in the drainage layer, and use vibrating equipment to compact the asphalt concrete.

[0013] S4: After applying adhesive on the surface of the large-pore open-graded drainage asphalt concrete in the sealed drainage structure, promptly install the corrugated steel lining of the lining support structure, pump the dense-graded asphalt concrete into the sealed drainage structure, fill the space between the corrugated steel lining and the sealed drainage structure, and vibrate the dense-graded asphalt concrete to make it dense using a vibrating device.

[0014] The present invention also discloses the application of a spatial structure based on the combined support of asphalt concrete and corrugated steel, including the construction method of the spatial structure based on the combined support of asphalt concrete and corrugated steel as described above. The spatial structure based on the combined support of asphalt concrete and corrugated steel is applied to a retired coal mine and the retired coal mine is built into a pumped storage power station or a compressed air energy storage power station.

[0015] Technical effects and advantages of the present invention:

[0016] 1. The present invention can effectively utilize the original support structure of the mine tunnel and adapt to the high surrounding rock pressure environment underground;

[0017] 2. The present invention can meet the needs of sealing space and draining surrounding rock fissure water through the composite structure of large-pore open-graded drainage asphalt concrete and dense-graded asphalt concrete;

[0018] 3. The asphalt concrete and corrugated steel structure used in the present invention have certain resistance to erosion, scour, deformation and cracking, and can adapt to the conditions of frequent pressure changes in the tunnel;

[0019] 4. The present invention is simple to construct, safe and reliable, and has low cost.

[0020] 5. The spatial structure based on the combined support of asphalt concrete and corrugated steel is applied to the withdrawn coal mine and the withdrawn coal mine is built into a pumped storage power station or a compressed air energy storage power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the spatial structure of the present invention based on the combined support of asphalt concrete and corrugated steel.

[0022] Figure 2 For the present invention Figure 1 Schematic diagram of the AA section structure.

[0023] In the figure: 1 is the basic support; 2 is the sealing drainage structure, 2-1 is the large-pore open-graded drainage asphalt concrete, 2-2 is the dense-graded asphalt concrete, 2-3 is the water filter pipe; 3 is the fastening structure; 4 is the lining support structure. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0025] The present invention provides Figure 1-Figure 2The spatial structure based on the combined support of asphalt concrete and corrugated steel shown in the figure includes a basic support 1, a sealing drainage structure 2, a fastening structure 3 and a lining support structure 4; wherein the basic support 1 is composed of coal mine roadway surrounding rock grouting and anchor net (cable) support, which can improve the stability of the roadway surrounding rock and ensure the safety of the roadway structure; the sealing drainage structure 2 is composed of large-pore open-graded drainage asphalt concrete 2-1, a water filter flower pipe 2-3 and a dense-graded asphalt concrete 2-2, wherein the large-pore open-graded drainage asphalt concrete and the water filter flower pipe play a role in hydrophobicity and pressure reduction, making the dense-graded asphalt concrete 2-2 and the lining support structure 4 to avoid being affected by the high water pressure of the surrounding rock; the dense-graded asphalt concrete 2-2 plays the role of sealing water and gas storage space, which can isolate the space in the tunnel from the water outside the surrounding rock; the fastening structure 3 is a short anchor rod with a hook, which can fix the sealing drainage structure 2 on the surrounding rock; the lining support structure 4 is a corrugated steel lining, which provides support for the asphalt concrete structure to ensure that it does not delaminate from the surrounding rock or produce large deformation. At the same time, the corrugated steel lining and asphalt concrete both have a certain elastic deformation resistance, can adapt to the environment of frequent changes in internal pressure, and can also evenly transfer the pressure in the tunnel to the surrounding rock.

[0026] The basic support 1 can use the original anchor net support structure of the tunnel, or can be supplemented with anchor rods and anchor cables, or re-constructed with anchor net support after tunnel expansion, or grouting reinforcement of surrounding rocks.

[0027] Before the construction of the sealing drainage structure 2, an adhesive is applied on the surrounding rock of the coal mine tunnel to bond the large-pore open-graded drainage asphalt concrete 2-1 to the basic support 1.

[0028] The water filter flower pipe 2-3 is arranged in the large-pore open-graded drainage asphalt concrete 2-1. Stainless steel flower pipes can be used, and other deformation-resistant and corrosion-resistant material flower pipes can also be used. The pipe can be filled with erosion-resistant and water-permeable coarse aggregate materials.

[0029] The lining support structure 4 serves as a template for the sealing drainage structure 2. After the corrugated steel lining is installed, the space between the corrugated steel lining and the sealing drainage structure 2 is filled densely with dense graded asphalt concrete 2-2.

[0030] The present invention also discloses a construction method for a spatial structure based on combined support of asphalt concrete and corrugated steel, comprising any of the above-described spatial structures based on combined support of asphalt concrete and corrugated steel, and further comprising the following steps:

[0031] S1: Evaluate the original support structure of the roadway. If the original anchor net support structure can ensure the safety and stability of the roadway, then use the original anchor net support structure as the basic support 1. If the original support is not sufficient to ensure the safety and stability of the roadway, then add anchor rods and anchor cables to the original roadway, or repair the original roadway and re-construct the anchor net support structure;

[0032] S2: After the basic support 1 is completed, the fastening structure 3 is pre-constructed according to the surrounding rock conditions, water gushing conditions, tunnel section and basic support method. The fastening structure 3 uses short anchor rods with curved hooks to tighten and fix the sealing and drainage structure 2 on the surrounding rock;

[0033] S3: After applying adhesive to the surface of the tunnel surrounding rock, support structure, and fastening structure 3, lay large-pore open-graded drainage asphalt concrete 2-1 as a sealing drainage structure 2. Based on the water outflow from the surrounding rock fissures, arrange an appropriate number of water filter pipes 2-3 at reasonable locations in the drainage layer, and vibrate the asphalt concrete to make it dense.

[0034] S4: After applying adhesive on the surface of the large-pore open-graded drainage asphalt concrete 2-1 in the sealed drainage structure 2, promptly install the corrugated steel lining of the lining support structure 4, pump the dense-graded asphalt concrete 2-2 in the sealed drainage structure 2, fill the space between the corrugated steel lining and the sealed drainage structure 2 densely, and vibrate the dense-graded asphalt concrete densely with a vibrating device.

[0035] The present invention also includes the application of spatial structures based on the combined support of asphalt concrete and corrugated steel, including the construction method of the spatial structure based on the combined support of asphalt concrete and corrugated steel as described above. The spatial structure based on the combined support of asphalt concrete and corrugated steel is applied to retired coal mines and the retired coal mines are built into pumped storage power stations or compressed air energy storage power stations.

Claims

1. A spatial structure based on the combined support of asphalt concrete and corrugated steel, characterized by: The invention comprises a basic support (1), a sealing drainage structure (2), a fastening structure (3) and an inner lining support structure (4), wherein the basic support (1) is composed of grouting of the surrounding rock of the supported coal mine roadway, an anchor net and an anchor cable, the sealing drainage structure (2) is composed of large-pore open-graded drainage asphalt concrete (2-1), a water filter flower pipe (2-3) and a dense-graded asphalt concrete (2-2), the fastening structure (3) is a short anchor rod with a hook, and the fastening structure (3) fixes the sealing drainage structure (2) on the surrounding rock, and the inner lining support structure (4) is a corrugated steel lining, and the inner lining support structure (4) provides support for the large-pore open-graded drainage asphalt concrete (2-1) and the dense-graded asphalt concrete (2-2); Apply adhesive to the surface of the basic support (1) and the fastening structure (3), lay large-pore open-graded drainage asphalt concrete (2-1), and arrange an appropriate number of drainage flower pipes (2-3) at reasonable positions in the large-pore open-graded drainage asphalt concrete (2-1); apply adhesive to the surface of the large-pore open-graded drainage asphalt concrete (2-1), install the corrugated steel lining of the lining support structure (4), pump in dense-graded asphalt concrete (2-2), and fill the space between the corrugated steel lining and the large-pore open-graded drainage asphalt concrete (2-1) tightly.

2. The spatial structure based on combined support of asphalt concrete and corrugated steel according to claim 1 is characterized in that: Before the construction of the sealing drainage structure (2), an adhesive is applied to the basic support to bond the large-pore open-graded drainage asphalt concrete (2-1) to the basic support (1).

3. The spatial structure based on combined support of asphalt concrete and corrugated steel according to claim 1 is characterized in that: The drainage flower pipe (2-3) is arranged in the large-pore open-graded drainage asphalt concrete (2-1), and the drainage flower pipe (2-3) is made of a deformation-resistant and corrosion-resistant material, and is filled with erosion-resistant and water-permeable coarse aggregate material.

4. A construction method for a spatial structure based on combined support of asphalt concrete and corrugated steel, characterized by: The spatial structure based on the combined support of asphalt concrete and corrugated steel according to any one of claims 1 to 3 further comprises the following steps: S1: Evaluate the original support structure on the original tunnel. If the original support structure can ensure the safety and stability of the original tunnel, then use the original support structure as the basic support (1). If the original support structure is not sufficient to ensure the safety and stability of the original tunnel, then add anchor rods and anchor cables to the original tunnel, or repair the original tunnel and re-construct the anchor net support structure. S2: After the basic support (1) is completed, a fastening structure (3) is pre-constructed according to the surrounding rock conditions, water gushing conditions, tunnel section and basic support method. The fastening structure (3) uses a short anchor rod with a hook to tighten and fix the sealing drainage structure (2) on the surrounding rock; S3: After applying adhesive on the surface of the basic support (1) and the fastening structure (3), lay the large-pore open-graded drainage asphalt concrete (2-1) as the sealing drainage structure (2) in a timely manner. According to the water outflow from the surrounding rock fissures, arrange a suitable number of water filter pipes (2-3) at reasonable positions in the drainage layer, and use vibration equipment to vibrate the asphalt concrete to make it dense; S4: After applying adhesive to the surface of the large-pore open-graded drainage asphalt concrete (2-1) in the sealing drainage structure (2), promptly install the corrugated steel lining of the lining support structure (4), pump the dense-graded asphalt concrete (2-2) in the sealing drainage structure (2), fill the space between the corrugated steel lining and the large-pore open-graded drainage asphalt concrete (2-1) tightly, and vibrate the dense-graded asphalt concrete tightly with a vibrating device.

5. Application of spatial structure based on combined support of asphalt concrete and corrugated steel, characterized by: Including the construction method of the spatial structure based on the joint support of asphalt concrete and corrugated steel as described in claim 4, the spatial structure based on the joint support of asphalt concrete and corrugated steel is used to build the retired coal mine into a pumped storage power station or a compressed air energy storage power station.

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