Improved underground artificial chamber vertical shaft excavation structure and construction method

Abstract

The invention relates to the field of underground engineering and compressed air energy storage, and discloses an improved underground artificial chamber vertical shaft excavation structure which comprises a first vertical shaft, a second vertical shaft, a tunnel, a reservoir, an air compressor, an expansion generator and a heat exchange system. The construction method comprises the steps that a first vertical shaft and a second vertical shaft are excavated through a drilling and blasting method, the first vertical shaft is deeper than the second vertical shaft, the distance between the first vertical shaft and the second vertical shaft is 100-200 m, lining is conducted section by section, an operation space is excavated in an expanding mode, a TBM tunneling machine is installed, the tunneling machine is connected with the vertical shafts according to a spiral path, excavation continues to be conducted after a tunnel is completed, and the tunneling machine is disassembled and hoisted out; and lining and supporting are completed. The technical scheme that a drilling and blasting method is combined with the TBM is adopted, the good forming effect of vertical shaft excavation and underground tunnel construction is achieved, the construction speed is increased, the safety risk of construction is reduced, and the working performance of a compressed air energy storage scheme is greatly optimized.

Description

Technical Field

[0001] The invention relates to the field of underground engineering and compressed air energy storage, and in particular to an improved underground artificial chamber shaft excavation structure and a construction method. Background Art

[0002] Existing compressed air energy storage projects mostly use natural hot caves such as salt caverns as gas storage bins, which are not only restricted by geographical location but also easily corrode equipment such as compressor expanders. In addition, the pressure cannot be released evenly, and equipment control is required during power generation. Therefore, the scheme of using underground artificial chambers as gas storage bins has attracted attention. The first thing that comes to mind when excavating underground artificial chambers is the more advanced TBM hard rock tunneling machine shield method. The scheme of simply using the shield method to first excavate a long inclined shaft to a predetermined depth, then excavate horizontally for a long distance, and then return to the ground in an inclined shaft has many disadvantages. First, in order to achieve long-term power generation, a larger tunnel space is required, so the tunnel will be very long. If it extends in a straight line, the risk of encountering poor geological conditions will be very high. Secondly, the scope of geological exploration before construction will be large and the cost will be very high. In addition, the long construction period and the difficulty of lining are not conducive to the maintenance and arrangement of detection devices, and the response speed of the system will be slow when working, etc.

[0003] In order to optimize the form structure and excavation technology of underground artificial chambers, an improved underground artificial chamber shaft excavation structure and construction method were proposed by combining drilling and blasting method with shield method, and combining shaft with underground curved tunnel. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an improved underground artificial chamber shaft excavation structure and construction method, which solves the problems in the prior art such as high risk of encountering adverse geological disasters, construction difficulties, low construction efficiency, high costs, slow response of the energy storage and power generation system after the hole is formed, large pressure fluctuations, and difficulty in regular maintenance.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an improved underground artificial chamber shaft excavation structure, comprising: Vertical shaft 1 and vertical shaft 2, both of which are vertical to the ground and are passages for water and compressed air to enter the underground tunnel; Tunnels, wherein a plurality of said tunnels are artificial chambers connected to the bottom of the first and second shafts through a spiral path; A reservoir connected to the upper portion of a pipeline arranged in the first vertical shaft; An air compressor and an expansion generator, both of which are connected to the upper part of the pipeline arranged in the second shaft; A heat exchange system is connected to the air compressor and the expansion generator.

[0006] Preferably, the first vertical shaft is deeper than the second vertical shaft, and the depth difference is 30 to 150 meters, and the shaft is perpendicular to the ground, and the distance between the first vertical shaft and the second vertical shaft is 100 to 200 meters.

[0007] Preferably, the tunnel is in a three-dimensional multi-segment spiral shape, and the tunnel design ensures that there are no intersections between the segments, the rock layer thickness of each tunnel at the closest point in space is not less than 2 to 3 times the diameter of the tunnel, and the interior of the tunnel is lined as necessary.

[0008] Preferably, the air compressor compresses the air in the atmosphere and injects it into the underground artificial chamber tunnel through the pipeline in the second vertical shaft, and discharges the water in the tunnel into the first vertical shaft and the reservoir.

[0009] Preferably, the expansion generator utilizes the water level difference between the tunnel serving as an underground artificial chamber and the water surface of the reservoir to apply pressure to the high-pressure air in the tunnel, and realizes balanced power generation by releasing the drive of constant high-pressure air.

[0010] Preferably, an operating room is excavated at the bottom of the shaft one and the shaft two to assemble a TBM hard rock tunnel boring machine. The multiple tunnels are excavated and constructed along a predetermined path by two tunnel boring machines and connected to the bottom of the shaft one and the shaft two. After the excavation is completed, the TBM hard rock tunnel boring machine is disassembled in the operating room and hoisted out of the shaft one and the shaft two.

[0011] Preferably, support structures are provided at the bottom of the first and second vertical shafts to enhance the stability of the surrounding rock and prevent landslides during the construction process.

[0012] An improved construction method for an underground artificial chamber shaft excavation structure comprises the following steps: S1. Use drilling and blasting method to dig vertical shaft 1 and shaft 2 vertically downward from the ground. Shaft 1 is deeper than shaft 2. The distance between shafts is 100 to 200 meters. Lining is carried out section by section as the excavation progresses. S2. Expand and dig out a large enough operating space at the bottom of shaft 1 and shaft 2 respectively and provide necessary support, and install a TBM hard rock tunneling machine in the operating space; S3, two TBM hard rock tunnel boring machines start from the bottom of shaft 1 and shaft 2 respectively, and excavate according to the predetermined path. The path design of the tunnel boring machine ensures that there is no intersection during construction. The construction path is designed along a spiral to connect shaft 1 and shaft 2; S4, TBM hard rock tunnel boring machine excavates from the bottom of one shaft to the bottom of another shaft, that is, to complete a tunnel, and can continue to excavate the next one until all the planned multiple tunnels are completed; After completing the construction task, the S5 and TBM hard rock tunnel boring machines are disassembled in the operating space at the bottom of shafts 1 and 2 and hoisted out through the two shafts; S6. Complete lining and support in the tunnel.

[0013] Preferably, the tunnel adopts multiple shorter tunnels to shorten the flow distance of compressed air and water in the tunnel between shafts, shorten the reaction time of the heat exchange system, and reduce the turbulence of the two fluids, water and air. At the same time, the shorter tunnel is also conducive to the arrangement of detection equipment and regular maintenance. The excavation path of the tunnel adopts a three-dimensional spiral curve design, the length of each tunnel section is controlled at 3 to 5 kilometers, and the rock layer thickness of each tunnel section at the closest point in space is not less than 2 to 3 times the diameter of the tunnel, and the turning radius meets the requirements of the TBM hard rock tunnel boring machine.

[0014] Preferably, the tunnel between the shaft one and the shaft two is connected by a spiral path without any intersection, which avoids interference between the equipment and the tunnel boring machine in the tunnel during the excavation process, ensures the smooth progress of the construction process, and facilitates the lining of the tunnel. After each section of the tunnel is excavated, the direction of the TBM hard rock tunnel boring machine is slightly adjusted, and the excavation of the next section of the tunnel can be carried out, ensuring the continuity of the construction of each section of the tunnel.

[0015] The present invention provides an improved underground man-made chamber shaft excavation structure and construction method, which has the following beneficial effects: 1. The present invention adopts a technical solution combining the drilling and blasting method to excavate a vertical shaft with a TBM hard rock tunnel boring machine to excavate a tunnel. Compared with the solution of using only a TBM hard rock tunnel boring machine to first dig an inclined shaft and then dig a long underground tunnel, it greatly improves the construction speed, shortens the construction period, saves a lot of costs, and reduces the safety risks of construction.

[0016] 2. The present invention expands a large operating space at the bottom of the shaft to install and disassemble the TBM hard rock tunneling machine, effectively solving the engineering connection problem between the shaft construction and the tunnel construction, and ensuring the smoothness of the overall project.

[0017] 3. The present invention adopts a multi-segment spiral curve to design the path of the underground tunnel, avoiding the problem of path intersection during construction, ensuring the stability of the tunnel and the safety of construction. Compared with a long-distance single tunnel, it reduces the geographical scope of the construction impact, saves exploration costs, reduces the risk of encountering adverse geological conditions, facilitates the arrangement of detection equipment and regular maintenance, increases the stability of internal fluid flow, and improves the sensitivity of system operation.

[0018] 4. The present invention can integrate resources more efficiently by quickly establishing channels for compressed air and water, providing a high-quality demonstration and model for the promotion and application of compressed air energy storage in artificial chambers, which is of great positive significance for achieving the "dual carbon goals". BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A perspective view of the present invention; Figure 2 It is a schematic diagram of the tunnel structure of the present invention; Figure 3 It is a three-dimensional diagram of the vertical shaft tunnel of the present invention.

[0020] Among them, 1. Vertical shaft 1; 2. Vertical shaft 2; 3. Tunnel; 4. Reservoir; 5. Air compressor; 6. Expansion generator; 7. Heat exchange system. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the specification 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.

[0022] Please see attached Figure 1 -Attached Figure 3 The embodiment of the present invention provides an improved underground artificial chamber shaft excavation structure, comprising: Vertical Shaft 1 and Vertical Shaft 2 are both vertical to the ground and are passages for water and compressed air to enter the underground tunnel 3. Vertical Shaft 1 is deeper than Vertical Shaft 2 with a depth difference of 30 to 150 meters and is vertical to the ground. The distance between Vertical Shaft 1 and Vertical Shaft 2 is 100 to 200 meters. Operating rooms are expanded at the bottom of Vertical Shaft 1 and Vertical Shaft 2 to assemble TBM hard rock tunneling machines. Support structures are arranged at the bottom of Vertical Shaft 1 and Vertical Shaft 2 to enhance the stability of the surrounding rock and prevent landslides during construction.

[0023] Specifically, both the shaft 1 and the shaft 2 are perpendicular to the horizontal ground, with a diameter of 6 to 12 meters. The shaft 1 is deeper than the shaft 2 (30 to 150) meters. The distance between the shaft 1 and the shaft 2 is 100 to 200 meters. During the construction process, in order to effectively improve the stability of the shaft, the lining is carried out section by section as the construction progresses. The depth of the shaft 1 is determined by the pressure demand of the expansion generator 6 for high-pressure air. The bottom of the shaft 1 and the shaft 2 are expanded to form an operating space, the size of which is based on the scale of the TBM hard rock tunneling machine. The TBM hard rock tunneling machine is assembled and disassembled in this space before and after the tunnel construction. For safety reasons, necessary support structures are set at the bottom of the shaft 1 and the shaft 2. The support structures are made of high-strength supporting materials, which play a role in enhancing the stability of the surrounding rock of the operating space, effectively preventing safety hazards such as shaft collapse and rock burst caused by rock stress release or other factors caused by changes in geological conditions during the construction process, and will not hinder the disassembly and assembly of the TBM hard rock tunneling machine. The underground operation space is also equipped with ventilation, communication and temperature control equipment as well as storage for emergency rescue materials to ensure the comfort and personal safety of underground construction workers. After the shaft is completed, lifting equipment is retained to transport personnel and materials.

[0024] Please see attached Figure 1 -Attached Figure 3 , tunnel 3, multiple tunnels 3 are artificial chambers, connected to the bottom of vertical shaft 1 and vertical shaft 2 through a spiral path, tunnel 3 is a three-dimensional multi-segment spiral shape, and the design of tunnel 3 ensures that there is no intersection between each section, the thickness of the rock layer of each tunnel 3 at the closest point in space is not less than 2 to 3 times the diameter of tunnel 3, and the interior of tunnel 3 is lined as necessary. Multiple tunnels 3 are excavated and constructed along a predetermined path by two tunneling machines and connected to the bottom of vertical shaft 1 and vertical shaft 2. After the excavation is completed, the TBM hard rock tunneling machine is disassembled in the operating room and hoisted out of vertical shaft 1 and vertical shaft 2.

[0025] Specifically, tunnel 3 is connected to the bottom of shaft 1 and shaft 2 through a spiral path. The diameter of tunnel 3 depends on the cutter diameter of the TBM hard rock tunnel boring machine, which can be 6 to 12 meters. During construction, two TBM hard rock tunnel boring machines start from the bottom of the two shafts respectively, and excavate independently without interfering with each other. The length of a single tunnel 3 is designed to be 3 to 5 km, but it must meet the turning radius of the TBM hard rock tunnel boring machine during excavation. The construction path of tunnel 3 is designed through a three-dimensional spiral curve to avoid the possibility of tunnel 3 crossing, ensuring that the thickness of each section of tunnel 3 at the closest point in space during the excavation process is not less than 2 to 3 times the diameter of tunnel 3. When the TBM hard rock tunnel boring machine excavates to the bottom of another shaft according to the predetermined path, the construction of a tunnel 3 is completed, and the construction of the next tunnel 3 can be carried out directly. The complexity of underground geological conditions was also considered when planning the spiral curve of the excavation path of Tunnel 3, and the three-dimensional spiral curve was optimized to ensure that Tunnel 3 could smoothly pass through complex rock formations, which not only ensured the continuity of excavation, but also avoided the construction difficulty and danger caused by the path being too long or too complicated. In addition, the excavation of each section of Tunnel 3 took into account the stability of the surrounding rock when entering and exiting the operating space at the bottom of the shaft. In order to reduce or prevent adverse geological disasters in these two places, the entrances and exits of each spiral tunnel 3 at the bottom of the two shafts can also be staggered up and down. After the construction is completed, in order to prevent leakage, metal pipe segments are lined on the inner wall of Tunnel 3. After the TBM hard rock tunneling machine completes the construction task, it is disassembled in the operating space at the bottom of Shaft 1 and Shaft 2, and hoisted out through the two shafts.

[0026] Please see attached Figure 1 -Attached Figure 3 , reservoir 4, reservoir 4 is connected to the upper part of the pipeline arranged in shaft 1, air compressor 5 and expansion generator 6, air compressor 5 and expansion generator 6 are both connected to the upper part of the pipeline arranged in shaft 2, air compressor 5 compresses the air in the atmosphere and injects it into tunnel 3 as an underground artificial chamber through the pipeline in shaft 2, and discharges the water in tunnel 3 into shaft 1 and reservoir 4, expansion generator 6 uses the water level difference between tunnel 3 as an underground artificial chamber and the water surface of reservoir 4 to apply pressure to the high-pressure air in tunnel 3, and realizes balanced power generation by releasing the drive of constant high-pressure air, heat exchange system 7, heat exchange system 7 is connected to air compressor 5 and expansion generator 6.

[0027] Specifically, the reservoir 4 is connected to the upper end of the pipe in the shaft 1, with a depth of about 50m, leaving margins for high and low water levels, storing enough water to ensure the system's usage and avoid overflow and loss. It is built with concrete and anti-seepage measures are taken. The connection between the reservoir 4 and the shaft 1 is designed as a horizontal bell-mouth connection to ensure that the water does not gush when entering and exiting the shaft 1, thereby ensuring the stability of the system. A filter screen and a gate valve are provided at the connection to prevent foreign matter from entering the tunnel 3 and to facilitate control. When the water in the reservoir 4 decreases, the water replenishment pump is started to replenish water; The air compressor 5 and the expansion generator 6 are connected to the upper part of the pipeline arranged in the vertical shaft 2, and the lower part of the pipeline in the vertical shaft 2 is connected to the tunnel 3. When the air compressor 5 is working, it transports compressed air to the tunnel 3 as an underground artificial chamber, and discharges the water in the tunnel 3 to the vertical shaft 1, occupying the space of the tunnel 3 and storing it in the tunnel 3. The magnitude of its pressure is equivalent to the pressure of the water between the tunnel 3 and the water surface of the reservoir 4. At the same time, when the compressor is working, the compression heat is stored through the heat exchange system 7. The expansion generator 6 uses the height difference between the water surface in the ground reservoir 4 and the underground tunnel 3 to apply constant high pressure to the compressed air in the tunnel 3 through the water column in the vertical shaft 1, and then the constant high-pressure air in the tunnel 3 rises to the ground through the pipeline in the vertical shaft 2 and enters the expansion generator 6 for balanced power generation. When generating electricity, it is also necessary to couple the stored heat energy to the high-pressure air through the heat exchange system 7.

[0028] Please see attached Figure 1 -Attached Figure 3 , an improved construction method of an underground artificial chamber shaft excavation structure, comprising the following steps: S1. Use drilling and blasting method to vertically excavate vertical shaft 1 and vertical shaft 2 on the ground. Vertical shaft 1 is deeper than vertical shaft 2. The distance between vertical shafts is 100 to 200 meters. Lining is carried out section by section as the excavation progresses. S2. Expand and dig out a sufficiently large operating space at the bottom of the shaft 1 and the shaft 2, respectively, and provide necessary support, and install a TBM hard rock tunneling machine in the operating space; S3, two TBM hard rock tunnel boring machines start from the bottom of shaft 1 and shaft 2 respectively, and excavate according to the predetermined path. The path design of the tunnel boring machine ensures that there is no intersection during construction. The construction path is designed along a spiral to connect shaft 1 and shaft 2; S4, the TBM excavates from the bottom of one shaft to the bottom of another shaft, that is, to complete a tunnel 3, and can continue to excavate the next one until all the planned multiple tunnels 3 are completed; S5, after the TBM hard rock tunnel boring machine completes the construction task, it is disassembled in the operating space at the bottom of the vertical shaft 1 and the vertical shaft 2, and hoisted out through the two vertical shafts; S6. Complete lining and support in Tunnel 3.

[0029] Specifically, at the beginning of construction, we must first have complete and detailed geological exploration data, and formulate an overall operation plan based on the geological data. The drilling and blasting method is used to excavate vertical shaft 1 and vertical shaft 2 on the ground. During excavation, drilling and lining should be carried out in sections as the construction progresses. Ensure that the construction plan of the two vertical shafts is adjusted in time according to the geological conditions. Vertical shaft 1 is 50 meters deeper than vertical shaft 2, and the spacing between the vertical shafts is 150 meters. According to the construction plan, the construction team excavates downward layer by layer to ensure the stability of the vertical shaft and avoid safety accidents such as landslides and gushing. After each blasting, the surrounding environment of the vertical shaft is inspected to ensure that the excavation process will not affect the surrounding environment or other facilities. There should be a structural design to accommodate silt at the bottom of the vertical shaft to prevent silt from affecting the system operation in the future and facilitate regular cleaning, but this structure should be built after the project is completed.

[0030] Sufficient operating space was excavated at the bottom of both shafts for the disassembly and assembly of the TBM hard rock tunnel boring machine. The excavation process was carried out alternately with the lining support work, and the quality, progress and safety of the project were given equal importance. After the construction of the operating space was completed, the ventilation equipment, tunnel temperature control equipment, power and lighting equipment, various emergency materials, etc. used for tunnel excavation were transported in through lifting equipment and installed or placed in the specified location. Then, the parts of the TBM hard rock tunnel boring machine were transported in for assembly and debugging.

[0031] Then, two TBM hard rock tunnel boring machines were started, and they started to dig along the predetermined path from the bottom of shaft 1 and shaft 2 respectively. During the excavation process, the attitude control of the tunnel boring machine is very important. It is necessary to ensure that the deviation of the two tunnel boring machines from the predetermined route during the construction process will not exceed the tolerance. The shorter path design of the tunnel is very beneficial for construction slag discharge and lining. The slag is lifted to the ground through the shaft, and some of the slag can also be processed into stone for underground lining. The path of the tunnel adopts a three-dimensional spiral design, connecting the operating space at the bottom of the two shafts. Each time a shaft is reached, a section is completed, and then the next section can be directly entered. The rock layer thickness of each section of the tunnel at the closest point in space is 2.5 times the diameter of the tunnel, which is strong enough. The tunnel sections do not intersect with each other, and the operations of the two TBM hard rock tunnel boring machines do not interfere with each other, which is smooth and fluent, with low risks and high efficiency.

[0032] In addition to being arranged in plane, the entrances and exits of each tunnel in the two operating spaces can also be staggered up and down.

[0033] After all underground tunnel construction is completed, the TBM hard rock tunnel boring machine is disassembled into parts in the working space, lifted out of the shaft, and necessary anti-seepage lining is carried out in the tunnel.

[0034] Through the excavation of Tunnel 3, multiple spiral channels were established between Shaft 1 and Shaft 2, forming underground artificial chambers as gas storage chambers for compressed air energy storage. Each tunnel is about 5 km long, and the spiral shape meets the turning radius of the TBM hard rock tunnel boring machine. Since multiple short tunnels replace a long single tunnel, it not only helps to reduce the risk of encountering adverse geological conditions and construction difficulties, shorten the construction period, but also increases the stability of internal water and air flow, facilitates the arrangement of detection equipment, and thus improves the sensitivity of the system. Therefore, it is more conducive to the efficient operation and regular maintenance of the compressed air energy storage system, and provides a high-quality demonstration and model for the promotion and application of compressed air energy storage in artificial chambers.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An improved underground artificial chamber shaft excavation structure, characterized in that: include: Vertical shaft 1 (1) and vertical shaft 2 (2), both of which are perpendicular to the ground and are passages for water and compressed air to enter the underground tunnel (3); Tunnels (3), wherein the plurality of tunnels (3) are artificial chambers connected to the bottom of the first vertical shaft (1) and the second vertical shaft (2) via a spiral path; A water reservoir (4), the water reservoir (4) being connected to the upper portion of a pipeline arranged in the first vertical shaft (1); An air compressor (5) and an expansion generator (6), wherein the air compressor (5) and the expansion generator (6) are both connected to the upper part of the pipeline arranged in the second vertical shaft (2); A heat exchange system (7), wherein the heat exchange system (7) is connected to the air compressor (5) and the expansion generator (6).

2. An improved underground artificial chamber shaft excavation structure according to claim 1, characterized in that: The vertical shaft 1 (1) is deeper than the vertical shaft 2 (2), and the depth difference is 30 to 150 meters. The vertical shaft 1 (1) is perpendicular to the ground, and the distance between the vertical shaft 1 (1) and the vertical shaft 2 (2) is 100 to 200 meters.

3. An improved underground artificial chamber shaft excavation structure according to claim 1, characterized in that: The tunnel (3) is in a three-dimensional multi-segment spiral shape, and the design of the tunnel (3) ensures that there is no intersection between the segments. The rock layer thickness of each tunnel (3) at the closest point in space is not less than 2 to 3 times the diameter of the tunnel (3), and the interior of the tunnel (3) is lined as necessary.

4. The improved underground artificial chamber shaft excavation structure according to claim 1, characterized in that: The air compressor (5) compresses the air in the atmosphere and injects the compressed air into the underground artificial chamber tunnel (3) through the pipeline in the second vertical shaft (2), and discharges the water in the tunnel (3) into the first vertical shaft (1) and the reservoir (4).

5. The improved underground artificial chamber shaft excavation structure according to claim 1, characterized in that: The expansion generator (6) utilizes the water level difference between the tunnel (3) serving as an underground artificial chamber and the water surface of the reservoir (4) to exert pressure on the high-pressure air in the tunnel (3), thereby achieving balanced power generation by releasing the drive of the constant high-pressure air.

6. An improved underground artificial chamber shaft excavation structure according to claim 1, characterized in that: An operating room is excavated at the bottom of the first vertical shaft (1) and the second vertical shaft (2) to assemble a TBM hard rock tunnel boring machine. The plurality of tunnels (3) are excavated and constructed along a predetermined path by the two tunnel boring machines and connected to the bottom of the first vertical shaft (1) and the second vertical shaft (2). After the excavation is completed, the TBM hard rock tunnel boring machine is disassembled in the operating room and hoisted out of the first vertical shaft (1) and the second vertical shaft (2).

7. An improved underground artificial chamber shaft excavation structure according to claim 1, characterized in that: A support structure is provided at the bottom of the first vertical shaft (1) and the second vertical shaft (2) to enhance the stability of the surrounding rock and prevent landslides during the construction process.

8. A construction method for an improved underground man-made chamber shaft excavation structure, applied to an improved underground man-made chamber shaft excavation structure as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Use drilling and blasting method to vertically excavate vertical shaft 1 (1) and vertical shaft 2 (2) on the ground. Vertical shaft 1 (1) is deeper than vertical shaft 2 (2). The distance between vertical shafts is 100 to 200 meters. Lining is carried out section by section as the excavation progresses. S2. Expand and dig out a sufficiently large operating space at the bottom of Shaft 1 (1) and Shaft 2 (2), provide necessary support, and install a TBM in the operating space; S3, two TBM hard rock tunnel boring machines start from the bottom of shaft 1 (1) and shaft 2 (2) respectively, and excavate along the predetermined path. The path design of the tunnel boring machines ensures that there is no intersection during construction. The construction path is designed along a spiral to connect shaft 1 (1) and shaft 2 (2); S4, the TBM excavates from the bottom of one shaft to the bottom of another shaft, completing one tunnel (3), and can continue to excavate the next one until all the planned multiple tunnels (3) are completed; S5. After the TBM has completed its construction task, it is disassembled in the operating space at the bottom of shaft 1 (1) and shaft 2 (2) and hoisted out through the two shafts; S6. Complete the lining and supports in tunnel (3).

9. The improved construction method of underground artificial chamber shaft excavation structure according to claim 8, characterized in that: The tunnel (3) adopts a plurality of shorter tunnels (3), the excavation path of the tunnel (3) adopts a three-dimensional spiral curve design, the length of each section of the tunnel (3) is controlled to be 3 to 5 kilometers, and the rock layer thickness at the closest point of each section of the tunnel (3) is not less than 2 to 3 times the diameter of the tunnel (3), and the turning radius meets the requirements of a TBM hard rock tunnel boring machine.

10. The improved construction method of underground artificial chamber shaft excavation structure according to claim 8, characterized in that: The tunnel (3) between the first shaft (1) and the second shaft (2) is connected by a spiral path without any intersection, thereby avoiding interference between the equipment and the tunnel boring machine in the tunnel (3) during the excavation process, ensuring a smooth construction process and facilitating lining of the tunnel (3). After the excavation is completed, the direction of the TBM hard rock tunnel boring machine is slightly adjusted to proceed with the excavation of the next section of the tunnel (3).

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