An underground space support system and its construction method

Abstract

This invention discloses an underground space support system and its construction method, solving the problems of complex connection operations and high construction difficulty in existing pipe curtain support structures. The underground space support system of this invention includes a support frame, within which a filling medium is applied to form a support structure. The support frame includes several foundation pipes, with adjacent foundation pipes connected by a pipe curtain structure constructed using a traction mechanism. The foundation pipes are connected by several pipe curtain structures to form a closed-loop structure or a segmented or multi-segmented open-loop structure. The pipe curtain structure connects corresponding foundation pipes by pushing out or partially cutting off the foundation pipes using the traction mechanism. The underground support structure of this invention is an in-situ replacement and integrally connected pipe curtain support structure. Through in-situ replacement, the segments of the pipe curtain structure form a whole structure, resulting in high connection strength, simple construction, strong operability, no soil exposure during the process, and a safe and reliable construction environment. This solves the problems of complex connection operations and high construction difficulty in existing pipe curtain support structures.

Description

Technical Field

[0001] This invention relates to the field of underground construction technology, and in particular to an underground space support system and its construction method. Background Technology

[0002] To meet the growing demand for underground space, the construction of underground oil depots, underground tunnels, hydropower station main buildings, large-span caverns, and large-span highway and railway tunnels is becoming increasingly common. During underground space excavation, a construction method of first supporting the structure and then excavating is often adopted to ensure construction safety. Among these methods, the pipe jacking method is a strong support structure, typically constructed using pipe jacking machines. Multiple sections / units of pipe are connected to form a structure supporting the surrounding rock of the tunnel, ensuring construction safety.

[0003] Existing technologies, such as Chinese Patent Publication No. CN 117823166 A, involve a combined pipe jacking system in soft soil strata and a method for excavating large-span underground spaces. This patent uses sleeves to connect pipe sections at the joints, resulting in weak joints and difficulty in installation within the soil. Chinese Patent Publication No. CN 115680717 A discloses an interlocking pipe jacking structure and its construction method, but the joint connections are difficult to operate, multiple loop pipes consume high energy, and the external strata for the pipe jacking structure are difficult to stabilize. Furthermore, Chinese Patent Publication No. CN 115680717 A discloses an interlocking pipe jacking structure and its construction method, but the joints use guide rail connections, resulting in complex connections and difficult operation. Therefore, it is necessary to develop an in-situ replaceable integral connection pipe jacking support structure and its construction method to solve the problems of complex connection operations and high construction difficulty in existing pipe jacking support structures. Summary of the Invention

[0004] To address the shortcomings in the aforementioned background technology, this invention proposes an underground space support system and its construction method, which solves the problems of complex connection operations and high construction difficulty in the existing pipe curtain support structure.

[0005] The technical solution of this invention is implemented as follows: an underground space support system includes a support frame, within which a filling medium is applied to form a support structure; the support frame includes several foundation pipes, and adjacent foundation pipes are connected by a pipe curtain structure constructed by a traction mechanism. The filling medium can be concrete.

[0006] Further optimization involves connecting several foundation pipes through several pipe curtain structures to form a closed-loop structure with the ends connected, or connecting them to form a one-segment or multi-segment open-loop structure; the pipe curtain structure connects two corresponding foundation pipes by pushing out or cutting off the entire or part of the foundation pipe through a traction mechanism.

[0007] In a further preferred embodiment, the traction mechanism includes an auxiliary component for traction by a traction device. The auxiliary component is disposed on both sides of the tunneling equipment and slides in cooperation with the corresponding foundation pipe. The pipe curtain structure is connected to the tail of the auxiliary component and can move synchronously with the auxiliary component.

[0008] In a further preferred embodiment, the auxiliary components include a front end sealing component and a support component that match the inner cavity of the foundation pipe. The support component is fixed to the back of the front end sealing component, and the front part of the front end sealing component is connected to a traction device located at the receiving end of the foundation pipe via a traction component. The tunneling equipment is fixedly connected to the support component. The pipe curtain structure is connected to the tail of the support component. Under the traction of the traction device and the pushing action of the tunneling equipment, the auxiliary components drive the pipe curtain structure to move forward.

[0009] Further preferably, the pipe curtain structure includes a steel box structure, which is embedded in the two corresponding foundation pipes and slides with the foundation pipes, and a sealing element is provided at the connection between the steel box structure and the foundation pipes.

[0010] In a further preferred embodiment, the pipe curtain structure also includes a sliding member, which is fixedly disposed on both sides of the steel box structure and slides in cooperation with the corresponding foundation pipe. A sealing member is provided between the sliding member and the inner wall of the foundation pipe.

[0011] In a further preferred embodiment, the pipe curtain structure also includes prefabricated filling blocks, which are fixed on the steel box structure and match and support the tunnel excavated by the tunneling equipment.

[0012] Further preferably, the base pipe is provided with an original structural part on the side corresponding to the pipe curtain structure, and the traction mechanism pushes out or cuts off the original structural part to form an opening of the base pipe; the base pipe containing N openings forms an N-pass pipe, N≥1; to adapt to the turning of the support line, and thus form support structures of different shapes.

[0013] Further preferably, the foundation pipe is equipped with a partition support, which divides the interior of the foundation pipe into N sealed cavities. The N sealed cavities meet the requirements for pipe curtain structure construction in different orientations, provide guiding channels for tunneling equipment, and at the same time, the partition support provides stability to the foundation pipe during construction.

[0014] A construction method for the aforementioned underground space support system comprises the following steps:

[0015] S1. Constructing foundation pipes: Construct two adjacent foundation pipes according to the support route to ensure that the distance between the two foundation pipes meets the requirements of the pipe jacking equipment.

[0016] S2. In-situ replacement of foundation pipe: The traction mechanism pushes out or cuts out the entire or part of the foundation pipe to form a single pipe. At the same time, the pipe curtain structure is constructed in situ to connect the two corresponding foundation pipes to form a single pipe structure unit.

[0017] S3. Constructing a double-pipe structure: Construct a foundation pipe on one side of the single-pipe structure unit according to the support route. The foundation pipe is set in correspondence with the single-pipe structure unit to meet the requirements of the pipe jacking equipment. Then, the traction mechanism pushes out or cuts out the entire or part of the foundation pipe and the single-pipe. At the same time, the pipe jacking structure is constructed in situ to connect the corresponding foundation pipe and the single-pipe, forming a single-pipe + double-pipe structure unit.

[0018] S4. Repeat step S3 until a transversely continuous support frame is formed according to the support route.

[0019] S5. Fill the support frame in step S4 with filling medium to form an integral support structure.

[0020] The working process of using the traction mechanism to push out the foundation pipe section in step S2 is as follows:

[0021] The original structural section is located on the side corresponding to the foundation pipe and the pipe curtain structure. The original structural sections of the two foundation pipes are arranged opposite each other. The auxiliary component is set at the starting end of the foundation pipe and ensures that the original structural section can be pushed out. The pipe curtain structure is set at the tail of the tunneling equipment and the auxiliary component. The auxiliary component is connected to the traction device by a steel wire rope. The tunneling equipment and the auxiliary component are pushed forward by the hydraulic cylinder of the tunneling equipment propulsion system and the reverse pull of the steel wire rope. The original structural section is gradually pushed out from the starting end to the receiving end by the auxiliary component, and the foundation pipe forms an opening. The tunneling equipment excavates the stratum between the two foundation pipes to form an intermediate channel. At the same time, the pipe curtain structure is embedded in the intermediate channel and the opening formed by the two foundation pipes and can move forward with the tunneling equipment and the auxiliary component.

[0022] The process of using a traction mechanism to push out the entire foundation pipe in step S2 is as follows:

[0023] The auxiliary component is set at the starting end of the foundation pipe, ensuring that the outer diameter of the auxiliary component matches that of the foundation pipe. The pipe curtain structure and the N-way pipe are connected to the tail of the tunneling equipment and the auxiliary component. The auxiliary component is connected to the traction device via a steel wire rope. The tunneling equipment and the auxiliary component are pushed forward by the hydraulic cylinder of the tunneling equipment's propulsion system and pulled back by the steel wire rope. The foundation pipe is gradually pushed from the starting end to the receiving end by the auxiliary component. The tunneling equipment excavates the strata between the two foundation pipes to form an intermediate channel. At the same time, the N-way pipe is laid in the original position of the foundation pipe, and the pipe curtain structure is embedded in the intermediate channel. The N-way pipe and the pipe curtain structure can move forward with the tunneling equipment and the auxiliary component.

[0024] The process of cutting off the foundation pipe section using the traction mechanism in step S2 is as follows:

[0025] The original structural parts are located on the corresponding sides of the foundation pipe and the pipe curtain structure. The original structural parts of the two foundation pipes are arranged opposite each other. The auxiliary parts are set at the starting end of the foundation pipe, ensuring that the excavation cutterhead of the tunneling equipment can cut the original structural parts. The pipe curtain structure is set at the tail of the tunneling equipment and the auxiliary parts. The auxiliary parts are connected to the traction device by steel wire rope. The tunneling equipment and the auxiliary parts are pushed forward by the hydraulic cylinder of the tunneling equipment propulsion system and pulled by the steel wire rope. The tunneling equipment cuts the foundation pipe to form an opening, and the tunneling equipment excavates the stratum between the two foundation pipes to form an intermediate channel. At the same time, the pipe curtain structure is embedded in the intermediate channel and the opening formed by the two foundation pipes and can move forward with the tunneling equipment and the auxiliary parts.

[0026] The beneficial effects of this invention are as follows: The underground support structure of this invention is an in-situ replacement and integrally connected pipe curtain support structure. Through in-situ replacement, the segments of the pipe curtain structure are formed into a whole structure, with high connection strength, simple construction, strong operability, no soil exposure during the process, and a safe and reliable construction environment. It solves the problems of complex connection operation and high construction difficulty of existing pipe curtain support structures. The underground support structure of this invention uses a traction device in conjunction with the tunneling equipment, and the auxiliary components are connected to the traction device by steel wire rope. Through hydraulic cylinder pushing and steel wire rope counter-pulling, the equipment advances and the pipe curtain structure is constructed simultaneously. This ensures both the safety of the foundation pipe construction and the synchronicity of in-situ replacement. Moreover, using the traction device as an auxiliary power for forward tunneling greatly improves construction efficiency. In addition, this invention also provides a construction method based on this type of pipe curtain support structure. The construction method is simple to operate with mechanized construction, has diverse construction processes, and can form different forms of underground support structures to meet different engineering needs and achieve safe construction. Attached Figure Description

[0027] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the two basic tubes of the present invention.

[0029] Figure 2 This is a construction diagram of the replacement pipe curtain structure with the original structure in Scheme 1;

[0030] Figure 3 This is a schematic diagram showing the positional relationship between the tunneling equipment and the opening of the single connecting pipe in Scheme 1;

[0031] Figure 4 This is a schematic diagram showing the completion of one section of the pipe jacking structure in Scheme 1;

[0032] Figure 5 This is a schematic diagram showing the completed construction of the two-section pipe curtain structure in Scheme 1;

[0033] Figure 6 Schematic diagrams of the foundation pipe structures with different numbers of original structures in Scheme 1;

[0034] Figure 7 This is a schematic diagram of the construction of the foundation pipe replacement pipe curtain structure and the single connecting pipe in Scheme 2;

[0035] Figure 8 This is a schematic diagram showing the completed construction of the three-section pipe curtain structure in Scheme 2;

[0036] Figure 9 This is a schematic diagram showing the completion of the overall support structure in Scheme 2;

[0037] Figure 10 This is a schematic diagram of the construction of the pipe curtain structure for replacing the foundation pipe in Scheme 3. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 9 As shown, an underground space support system includes a support frame 10, within which a filling medium 20 is applied to form a support structure 8. The filling medium 20 can be reinforced concrete cage, forming a stable underground support structure. The support frame 10 includes several foundation pipes 1, with adjacent foundation pipes 1 connected by a pipe curtain structure 3 constructed using a traction mechanism. The pipe curtain structure 3 interlocks with the foundation pipes 1; an opening on each foundation pipe 1 connects to a pipe curtain structure, forming a continuous support frame that adapts to different support environments. Furthermore, the pipe curtain structure 3 constructed using the traction mechanism offers high connection strength, simple construction, strong operability, and prevents soil exposure during the process, ensuring a safe and reliable construction environment.

[0041] In this embodiment, as a preferred solution, several basic pipes 1 are connected by several pipe curtain structures 3 to form a closed-loop structure with ends connected, or to form a one-segment or multi-segment open-loop structure; the closed-loop structure can be rectangular, circular, or double-rectangular, etc. Figure 9As shown. A single-segment or multi-segment open-loop structure can be a single or multiple segments of straight lines, arcs, curves, etc. The pipe curtain structure 3 connects two corresponding foundation pipes 1 by pushing out or cutting off the entire or part of the foundation pipe 1 using a traction mechanism. The traction mechanism pushes out a portion of the foundation pipe 1, forming an opening, and the pipe curtain structure 3 slides into the opening to connect the two foundation pipes. Alternatively, the traction mechanism pushes out the entire portion of the foundation pipe 1 and then replaces it with a connecting pipe with an opening, and the pipe curtain structure 3 slides into the opening to connect the two foundation pipes. This method can also be used for repairing foundation pipes. Alternatively, the traction mechanism cuts off a portion of the foundation pipe 1, forming an opening, and the pipe curtain structure 3 slides into the opening to connect the two foundation pipes. The above mechanized construction operation is simple, has high connection strength, meets different engineering needs, and achieves safe construction results.

[0042] In this preferred embodiment, the traction mechanism includes an auxiliary component 4 for traction by a traction device. The traction device is located at the corresponding receiving end and can be used to traction the auxiliary component along the foundation pipe using a winch or similar device. The auxiliary component 4 is located on both sides of the tunneling equipment 5 and slides in conjunction with the corresponding foundation pipe 1. The pipe curtain structure 3 is connected to the tail of the auxiliary component 4 and can move synchronously with it. The pipe curtain structure 3 can also be connected to the tail of the tunneling equipment and the auxiliary component, moving synchronously with them in a manner similar to pipe jacking construction. The traction device is located on the forward direction of the auxiliary component, and it is simultaneously pulled forward by the tunneling equipment at the arrival end, accelerating the tunneling efficiency, reducing the thrust of the hydraulic cylinders in the tunneling propulsion system, and making the tunneling more stable through a push and pull mechanism.

[0043] Example 2

[0044] like Figure 2 As shown, an underground space support system is further optimized based on Embodiment 1: The auxiliary component 4 includes a front end sealing component 41 and a support component 43 that match the inner cavity of the foundation pipe 1. The front end sealing component 41 slides to seal the cavity of the foundation pipe, preventing excavated water and soil from entering the channel. The support component 43 is fixed to the back of the front end sealing component 41. The front part of the front end sealing component 41 is connected to the traction device located at the receiving end of the foundation pipe 1 through the traction component 42. The body of the tunneling equipment 5 is fixedly connected to the support component 43. The auxiliary component is located on both sides of the tunneling equipment, providing concave space to meet the working space of the tunneling equipment cutterhead. The pipe curtain structure 3 is connected to the tail of the support component 43. Under the traction of the traction device and the pushing action of the tunneling equipment 5, the auxiliary component 4 drives the pipe curtain structure 3 to move forward.

[0045] In this embodiment, the pipe curtain structure 3 includes a steel box structure 31, which is welded from steel. The steel box structure 31 is embedded in two corresponding foundation pipes 1 and slides in conjunction with them. A sealing element is provided at the connection between the steel box structure 31 and the foundation pipe 1 to ensure the airtightness of the connection between the pipe curtain structure and the foundation pipe. The steel box structure is arranged vertically along the tunnel axis and is supported by columns in the middle. Adjacent pipe curtain structures can be connected to each other to form an overall frame structure.

[0046] Preferably, depending on the foundation pipe and geological conditions, the pipe curtain structure 3 further includes a sliding member 33. The sliding member 33 is fixedly installed on both sides of the steel box structure 31, filling the sealing cavity of the foundation pipe. The sliding member 33 slides with the corresponding foundation pipe 1, and a sealing element is provided between the sliding member 33 and the inner wall of the foundation pipe 1 to improve the sealing performance between the foundation pipe and the sliding member. The sliding member moves within the cavity structure of the connecting pipe and is mortised and tenoned with the connecting pipe, supporting the opening of the connecting pipe during tunneling and ensuring construction safety.

[0047] It should be noted that when the tunnel excavated by the cutterhead of the tunneling equipment is inconsistent with the shape of the pipe jacking structure, the pipe jacking structure 3 also includes precast filling blocks 32, which are preferably precast concrete filling blocks. The precast filling blocks 32 are fixed to the steel box structure 31, matching and supporting the tunnel excavated by the tunneling equipment 5; the precast filling blocks 32 fill the remaining space of the tunneling channel, ensuring the stability of the surrounding strata. The precast filling blocks 32 can be fixed to the steel box structure 31 with bolts for easy assembly. That is, when the cutterhead is circular, its excavation channel is circular, while the pipe jacking structure is a rectangular box structure. In this case, semi-circular precast filling blocks are needed to fill the remaining part of the cutterhead excavation channel. In this case, it consists of the main steel box structure, semi-circular sliding parts, and precast concrete filling structure; the pipe jacking structure fills the entire tunneling channel. When the cutterhead is rectangular and its excavation channel cross-section is consistent with the outer contour of the pipe jacking structure, precast filling blocks are not required.

[0048] Example 3

[0049] like Figure 5 , 6 As shown, an underground space support system, in this embodiment based on embodiment 1 or 2, has an original structural part 11 on the side corresponding to the pipe curtain structure 3. The original structural part 11 can be pushed out by the action of auxiliary components or cut off by the cutterhead of the tunneling equipment; the pushing mechanism pushes out or cuts off the original structural part 11 to form an opening in the foundation pipe 1; the foundation pipe 1 containing N openings forms an N-connecting pipe, where N≥1; the connecting pipe is formed by replacing the foundation pipe in situ, and the connecting pipe has a continuous interlocking opening along the tunnel axis direction, with the pipe curtain structure embedded in the opening. One connecting pipe has two openings, and one opening connects to one pipe curtain structure. In this embodiment, N is preferably 1, 2, 3, or 4, such as... Figure 5As shown, the single-pass pipe 21 contains one original structural part 11, forming one opening, while the double-pass pipe 22 contains two original structural parts 11, forming two openings. Figure 6 As shown, the three-way pipe 23 contains three original structural parts 11, which can form three openings; the four-way pipe 24 contains four original structural parts 11, which can form four openings. The openings of the connecting pipes are formed by replacing the original structures at the openings with new structures. Taking the base pipe as an example with two original structures, the single connecting pipe is formed by replacing one original structure in situ with the base pipe, leaving one original structure; the double connecting pipe is formed by replacing the remaining original structure in situ with the single connecting pipe, and the double connecting pipe has no original structure.

[0050] In this embodiment, as a preferred option, such as Figure 6 As shown, the foundation pipe 1 is equipped with a partition support 12, which divides the interior of the foundation pipe 1 into N sealed cavities. The periphery of each sealed cavity includes an opening, accommodating pipe curtain structure construction in different orientations and providing a guiding channel for the tunneling equipment. The partition support 12 is a diaphragm column, corresponding to the uprights of the pipe curtain structure, forming a transversely continuous support frame. Material is then filled into the frame to form an integral support structure.

[0051] Example 4

[0052] A construction method for an underground space support system as described in Example 1, 2, or 3, comprising the following steps:

[0053] S1. Constructing the foundation pipes: Construct two adjacent foundation pipes 1 according to the support route, ensuring that the distance between the two foundation pipes 1 meets the requirements of the pipe jacking equipment.

[0054] S2. In-situ replacement of the foundation pipe: The traction mechanism pushes out the entire foundation pipe 1, or cuts / pushes out a portion of the foundation pipe 1 to form a single-pass pipe. Simultaneously, the pipe curtain structure 3 is constructed in-situ to connect the corresponding two foundation pipes 1, forming a single-pass pipe structural unit. When cutting out a portion of the foundation pipe 1, one foundation pipe forms a corresponding opening. The openings on the two foundation pipes correspond to the two channels of the pipe curtain structure 3, ensuring that the pipe curtain structure 3 is embedded and interlocked at the openings to ensure stable support. When pushing out the entire foundation pipe 1, the original foundation pipe is directly replaced in-situ with a foundation pipe with an opening. The foundation pipe with an opening directly replaces the original foundation pipe with the pipe curtain structure 3 through an embedded and interlocking manner.

[0055] S3. Constructing a double-pipe structure: Constructing a foundation pipe 1 on one side of the single-pipe structure unit according to the support route. The foundation pipe 1 is set in correspondence with the single-pipe structure unit to meet the requirements of the pipe curtain excavation equipment. Then, the traction mechanism pushes out or cuts out the entire or part of the foundation pipe 1 and the single-pipe. At the same time, the pipe curtain structure 3 is constructed in situ to connect the corresponding foundation pipe 1 and the single-pipe, forming a single-pipe + double-pipe structure unit.

[0056] S4. Repeat step S3 until a transversely continuous support frame is formed according to the support route. It should be noted that after the construction of a single connecting pipe is completed, based on the designed support route, a new adjacent foundation pipe is built, and then the single connecting pipe located at the connection node of the support structure is replaced in situ in the same way, forming a double connecting pipe connecting two adjacent pipe curtain structures. Similarly, after the construction of a double connecting pipe is completed, based on the designed support route, a new adjacent foundation pipe is built, and then the double connecting pipe located at the connection node of the support structure is replaced in situ in the same way, forming a triple connecting pipe connecting three adjacent pipe curtain structures. This process continues, constructing the pipe curtain frame structure sequentially, with adjacent pipe curtain structures connected within the connecting pipes to form a transversely continuous support frame.

[0057] S5. Add filling medium into the support frame in step S4. The filling medium can be reinforced concrete cage to form an integral support structure and ensure the stability of the support structure.

[0058] like Figures 1-6 As shown in the first implementation plan, when the foundation pipe 1 is pushed out using the traction mechanism in step S2, it is necessary to ensure the angle, position, and other parameters of the original structure of the foundation pipe, requiring high precision and quality. The specific working process is as follows:

[0059] The original structural part 11 is provided on the side corresponding to the base pipe 1 and the pipe curtain structure 3. In this scheme, the original structural part 11 can be pushed out from the base pipe 1. The original structural parts 11 of the two base pipes 1 are arranged opposite each other. The auxiliary component is set at the starting end of the base pipe 1 to ensure that the original structural part 11 can be pushed out. The pipe curtain structure 3 is set at the tail of the tunneling equipment 5 and the auxiliary component. The auxiliary component is connected to the traction device by a steel wire rope. The tunneling equipment 5 and the auxiliary component are pushed forward by the hydraulic cylinder of the propulsion system and the reverse pull of the steel wire rope. The original structural part 11 is gradually pushed out from the starting end to the receiving end by the auxiliary component to form an opening, and the base pipe 1 forms a single connecting pipe. The tunneling equipment 5 excavates the stratum between the two base pipes 1 to form an intermediate channel. At the same time, the pipe curtain structure 3 is embedded in the intermediate channel and the opening formed by the two base pipes 1 and can move forward with the tunneling equipment 5 and the auxiliary component.

[0060] During the tunneling process, the original structure is gradually pushed out from the starting end by the auxiliary components, and the pipe curtain structure is slidably connected to the opening of the single connecting pipe through the channels of the auxiliary components and the tunneling equipment.

[0061] like Figures 7-9 As shown in Implementation Scheme 2, when the entire foundation pipe 1 is pushed out using a traction mechanism in step S2, the foundation pipe as a whole is replaced by an integral structure. This is achieved by replacing the foundation pipe in situ with the connecting pipe, thus connecting the various pipe curtain structures. The specific working process is as follows:

[0062] The auxiliary component is located at the starting end of the foundation pipe 1, ensuring that its outer diameter matches that of the foundation pipe 1. The pipe curtain structure 3 and the N-connector are connected to the tunneling equipment 5 and the tail of the auxiliary component. The N-connector here can be a double-connector or a three-connector. A sliding rail is provided at the opening of the connecting pipe, and the pipe curtain structure is connected to the connecting pipe through the sliding rail, such as a CT-style connection that runs along the tunnel direction. The connecting pipe and the pipe curtain structure can slide. A sealing structure is provided at the opening. Preferably, the sliding rail is located on the pipe curtain structure and filled with grease, which satisfies both the lubrication of the chute and the waterproofing effect. The auxiliary components and traction device are connected by steel wire ropes. The tunneling equipment 5 and its auxiliary components are pushed forward by the hydraulic cylinders of the propulsion system and pulled back by the steel wire ropes. The foundation pipe 1 is gradually pushed out from the starting end to the receiving end by the auxiliary components. The tunneling equipment 5 excavates the stratum between the two foundation pipes 1 to form an intermediate channel. At the same time, the N-channel pipe is laid to the original position of the foundation pipe, and the pipe curtain structure 3 is embedded in the intermediate channel. The N-channel pipe and the pipe curtain structure 3 can move forward with the tunneling equipment 5 and its auxiliary components.

[0063] In Scheme 2, the steel box structure of the pipe curtain is embedded in the opening of the single connecting pipe, and the two are connected by a chute filled with grease during tunneling. During tunneling, the foundation pipe is gradually pushed out from the starting end by the auxiliary components, and the pipe curtain structure and the single connecting pipe are set in the passage between the auxiliary components and the tunneling equipment to form a section of pipe curtain structure. Scheme 2 requires multiple pipe replacements to ensure construction quality and efficiency.

[0064] like Figure 10 As shown in Implementation Scheme 3, the process of using a traction mechanism to cut off part of the foundation pipe 1 in step S2 is as follows:

[0065] The original structural part 11 is provided on the side corresponding to the foundation pipe 1 and the pipe curtain structure 3. In this scheme, the original structural part refers to the part cut off from the foundation pipe 1 during construction, and there is no special limitation on this part on the foundation pipe. The original structural parts 11 of the two foundation pipes 1 are arranged opposite each other. The auxiliary component is set at the starting end of the foundation pipe 1, and it is ensured that the excavation cutterhead of the tunneling equipment 5 can cut the original structural part 11. The pipe curtain structure 3 is set at the tail of the tunneling equipment 5 and the auxiliary component. The auxiliary component is connected to the traction device through a steel wire rope. The tunneling equipment 5 and the auxiliary component are pushed forward by the hydraulic cylinder of the propulsion system and the reverse pull of the steel wire rope. The tunneling equipment 5 cuts the foundation pipe 1 to form an opening, and the tunneling equipment 5 excavates the stratum between the two foundation pipes 1 to form an intermediate channel. At the same time, the pipe curtain structure 3 is embedded in the intermediate channel and the opening formed by the two foundation pipes 1 and can move forward with the tunneling equipment 5 and the auxiliary component.

[0066] In Scheme 3 above, during tunneling, the tunneling equipment cuts the foundation pipe to form a single connecting pipe. Auxiliary components temporarily support this single connecting pipe within a certain range. The pipe curtain structure slides and connects to the single connecting pipe, moving with the auxiliary components and the tunneling equipment, and supporting the opening of the single connecting pipe. After the single connecting pipe is constructed, it is cut in situ in the same manner. The auxiliary components guide and seal the cavity structure and connect with the tunneling equipment as the pipe curtain structure moves. After cutting, a double connecting pipe is formed, connecting two sections of the pipe curtain structure. This process is repeated, with the pipe curtain frame structure constructed sequentially. One double connecting pipe connects two pipe curtain structures, and adjacent pipe curtain structures are connected within the connecting pipe to form a transversely continuous support frame. Concrete is then filled into the support frame to form an integral support structure.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for an underground space support system, characterized in that: The underground space support system includes a support frame (10), and a support structure (8) is formed by filling medium (20) inside the support frame (10); the support frame (10) includes a number of foundation pipes (1), and two adjacent foundation pipes (1) are connected by a pipe curtain structure (3) constructed by a traction mechanism. The steps are as follows: S1. Constructing the foundation pipe: Construct two adjacent foundation pipes (1) according to the support route to ensure that the distance between the two foundation pipes (1) meets the requirements of the pipe jacking equipment; S2, In-situ replacement of base pipe: The traction mechanism pushes out or cuts out the entire or part of the base pipe (1) to form a single pipe, and at the same time, the in-situ pipe curtain structure (3) is constructed to connect the two corresponding base pipes (1) to form a single pipe structure unit; S3. Constructing a double-pipe structure: Construct a foundation pipe (1) on one side of the single-pipe structure unit according to the support route. The foundation pipe is set in correspondence with the single-pipe structure unit to meet the requirements of the pipe curtain excavation equipment. Then, the traction mechanism pushes out or cuts out the entire or part of the foundation pipe (1) and the single-pipe structure. At the same time, the pipe curtain structure (3) is constructed in situ to connect the corresponding foundation pipe (1) and the single-pipe structure, forming a single-pipe + double-pipe structure unit. S4. Repeat step S3 until a transversely continuous support frame is formed according to the support route. S5. Fill the support frame in step S4 with filling medium to form an integral support structure.

2. The construction method of the underground space support system according to claim 1, characterized in that: Several base pipes (1) are connected by several pipe curtain structures (3) to form a closed loop structure with the ends connected or to form a one-segment or multi-segment open loop structure; the pipe curtain structure (3) connects the corresponding two base pipes (1) by pushing out or cutting off the base pipes (1) in whole or in part through a traction mechanism.

3. The construction method of the underground space support system according to claim 1 or 2, characterized in that: The traction mechanism includes an auxiliary component (4) for traction by a traction device. The auxiliary component (4) is set on both sides of the tunneling equipment (5) and slides in cooperation with the corresponding foundation pipe (1). The pipe curtain structure (3) is connected to the tail of the auxiliary component (4) and can move synchronously with the auxiliary component (4).

4. The construction method of the underground space support system according to claim 3, characterized in that: The auxiliary component (4) includes a front end sealing component (41) and a support component (43) that match the inner cavity of the foundation pipe (1). The support component (43) is fixed to the back of the front end sealing component (41). The front part of the front end sealing component (41) is connected to the traction device set at the receiving end of the foundation pipe (1) through the traction component (42). The tunneling equipment (5) is fixedly connected to the support component (43). The pipe curtain structure (3) is connected to the tail of the support component (43). Under the traction of the traction device and the pushing action of the tunneling equipment (5), the auxiliary component (4) drives the pipe curtain structure (3) to move forward.

5. The construction method of the underground space support system according to claim 1 or 2, characterized in that: The pipe curtain structure (3) includes a steel box structure (31), which is embedded in the two corresponding base pipes (1) and slides with the base pipes (1). A sealing element is provided at the connection between the steel box structure (31) and the base pipes (1).

6. The construction method of the underground space support system according to claim 5, characterized in that: The pipe curtain structure (3) also includes a sliding member (33), which is fixedly installed on both sides of the steel box structure (31) and slides in cooperation with the corresponding foundation pipe (1). A sealing member is provided between the sliding member (33) and the inner wall of the foundation pipe (1).

7. The construction method of the underground space support system according to claim 6, characterized in that: The pipe curtain structure (3) also includes a precast filling block (32), which is fixed on the steel box structure (31). The precast filling block (32) matches the tunnel excavated by the tunneling equipment (5) and supports it.

8. The construction method of the underground space support system according to claim 1 or 7, characterized in that: The base pipe (1) is provided with an original structure part (11) on the side corresponding to the pipe curtain structure (3). The traction mechanism pushes out or cuts off the original structure part (11) to form an opening of the base pipe (1). The base pipe (1) containing N openings forms an N-pass pipe, where N≥1. The base pipe (1) is provided with a partition support (12), which divides the interior of the base pipe (1) into N sealed cavities.

9. The construction method of the underground space support system according to claim 8, characterized in that: The working process of using the traction mechanism to push out part of the foundation pipe (1) in step S2 is as follows: The original structure part (11) is provided on the side corresponding to the pipe curtain structure (3). The original structure parts (11) of the two foundation pipes (1) are arranged opposite each other. The auxiliary parts are set at the starting end of the foundation pipe (1) and it is ensured that the original structure part (11) can be pushed out. The pipe curtain structure (3) is set at the tail of the tunneling equipment (5) and the auxiliary parts. The auxiliary parts are connected to the traction device by steel wire rope. The tunneling equipment (5) and the auxiliary parts are pushed forward by the hydraulic cylinder of the tunneling equipment (5) propulsion system and the steel wire rope is pulled back. The original structural part (11) is gradually pushed from the starting end to the receiving end by the auxiliary parts, the foundation pipe (1) forms an opening, and the tunneling equipment (5) excavates the stratum between the two foundation pipes (1) to form an intermediate channel; at the same time, the pipe curtain structure (3) is embedded in the intermediate channel and the opening formed by the two foundation pipes (1) and can move forward with the tunneling equipment (5) and the auxiliary parts. The working process of pushing out the entire foundation pipe (1) using the traction mechanism in step S2 is as follows: The auxiliary component is set at the starting end of the foundation pipe (1) and ensures that the outer diameter of the auxiliary component matches the foundation pipe (1). The pipe curtain structure (3) and the N-pass pipe are connected to the tunneling equipment (5) and the tail of the auxiliary component. The auxiliary component is connected to the traction device by a steel wire rope. The tunneling equipment (5) and the auxiliary component are pushed forward by the hydraulic cylinder of the propulsion system and the steel wire rope is pulled back. The foundation pipe (1) is gradually pushed from the starting end to the receiving end by the auxiliary component. The tunneling equipment (5) excavates the stratum between the two foundation pipes (1) to form an intermediate channel. At the same time, the N-pass pipe is laid to the original position of the foundation pipe. The pipe curtain structure (3) is embedded in the intermediate channel. The N-pass pipe and the pipe curtain structure (3) can move forward with the tunneling equipment (5) and the auxiliary component. The process of cutting off the foundation pipe (1) using the traction mechanism in step S2 is as follows: The original structure part (11) is provided on the side corresponding to the foundation pipe (1) and the pipe curtain structure (3). The original structure parts (11) of the two foundation pipes (1) are set opposite to each other. The auxiliary parts are set at the starting end of the foundation pipe (1) and ensure that the excavation cutterhead of the tunneling equipment (5) can cut the original structure part (11). The pipe curtain structure (3) is set at the tail of the tunneling equipment (5) and the auxiliary parts. The auxiliary parts are connected to the traction device by a steel wire rope. The tunneling equipment (5) and the auxiliary parts are pushed forward by the hydraulic cylinder of the tunneling equipment (5) propulsion system and the steel wire rope is pulled back. The tunneling equipment (5) cuts the foundation pipe (1) to form an opening. The tunneling equipment (5) excavates the stratum between the two foundation pipes (1) to form an intermediate channel. At the same time, the pipe curtain structure (3) is embedded in the intermediate channel and the opening formed by the two foundation pipes (1) and can move forward with the tunneling equipment (5) and the auxiliary parts.

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