Underground space supporting system and construction method thereof

Abstract

The invention discloses an underground space supporting system and a construction method thereof. The problems that in the prior art, a pipe roof supporting structure is complex in connection operation and large in construction difficulty are solved. The underground space supporting system comprises a supporting frame, and a filling medium is applied in the supporting frame to form a supporting structure; the supporting frame comprises a plurality of foundation pipes, and every two adjacent foundation pipes are connected through a pipe roof structure constructed by a traction and pushing mechanism. The plurality of foundation pipes are connected through the plurality of pipe curtain structures to form an end-to-end closed-loop structure or connected to form a one-section or multi-section open-loop structure; the pipe curtain structure is connected with the two corresponding foundation pipes in the mode that the traction and pushing mechanism pushes out or cuts off the whole or part of the foundation pipes. The underground supporting structure is an in-situ replacement integral connection pipe curtain supporting structure, the pipe curtain structures form an integral structure through in-situ replacement, the connecting strength is high, construction is easy, operability is high, the soil exposure phenomenon does not occur in the process, and the construction environment is safe and reliable; the problems that in the prior art, a pipe roof supporting structure is complex in connection operation and large in construction difficulty are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground construction, and in particular to an underground space support system and a construction method thereof. Background Art

[0002] To meet the growing demand for underground space, more and more underground oil storage depots, underground tunnels, main powerhouses of hydropower stations, large-span caverns, and large-span highway and railway tunnels are being built. When excavating underground space, the construction method of first supporting and then excavating is often used to ensure construction safety. Among them, the pipe curtain method is a strong support structure form, which is generally constructed by a pipe jacking machine. Multiple sections / individual pipes are connected to form a structure that supports the tunnel surrounding rock to ensure construction safety.

[0003] In the prior art, for example, Chinese patent with publication number CN 117823166 A involves a combined pipe curtain in soft soil and a method for dark excavation in large-span underground spaces. In the patent, sleeves are used to connect the pipe sections at the joints, the joints are weak, and it is not easy to install them in the strata. Chinese patent with publication number CN 115680717 A discloses an interlocking pipe curtain structure and its construction method. The joints are not easy to operate, the multiple ring pipes consume a lot of energy, and it is difficult to stabilize the strata outside the pipe curtain structure. Chinese patent with publication number CN 115680717 A discloses an interlocking pipe curtain structure and its construction method. The joints are connected by guide rails, the connection parts are complex, and it is not easy to operate. Therefore, it is necessary to develop an in-situ replacement integrally connected pipe curtain support structure and construction method to solve the problems of complex connection operation and difficult construction of existing pipe curtain support structures. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes an underground space support system and a construction method thereof, which solves the problems in the prior art that the connection operation of the pipe curtain support structure is complicated and the construction is difficult.

[0005] The technical solution of the present invention is implemented as follows: an underground space support system includes a support frame, a filling medium is applied in the support frame to form a support structure; the support frame includes a plurality of foundation pipes, and two adjacent foundation pipes are connected by a pipe curtain structure applied by a pulling and pushing mechanism. The filling medium can be concrete.

[0006] Further preferably, several base tubes are connected by several tube curtain structures to form a closed loop structure connected end to end or to form a one-stage or multi-stage open loop structure; the tube curtain structure connects the corresponding two base tubes by pushing out or cutting off the base tube in whole or in part through a pulling mechanism.

[0007] Further preferably, the pulling and pushing mechanism includes an auxiliary part pulled by a traction device, the auxiliary part is arranged on both sides of the tunneling equipment and slidingly cooperates with the corresponding foundation pipe; the pipe curtain structure is connected to the tail of the auxiliary part and can move synchronously with the auxiliary part.

[0008] Further preferably, the auxiliary parts include a front end face sealing part and a supporting part matching the inner cavity of the base pipe, the supporting part is fixed to the back of the front end face sealing part, the front part of the front end face sealing part is connected to the traction device arranged at the receiving end of the base pipe through a traction part, and the excavation equipment is fixedly connected to the supporting part; the pipe curtain structure is connected to the tail of the supporting part, and the auxiliary parts drive the pipe curtain structure to move forward under the traction of the traction device and the pushing action of the excavation equipment.

[0009] Further preferably, the pipe-roof structure comprises a steel box structure, which is embedded in the corresponding two base pipes and slidably matched with the base pipes, and a seal is provided at the connection between the steel box structure and the base pipes.

[0010] Further preferably, the tube-roof structure further comprises sliding members, which are fixedly arranged on both sides of the steel box structure and slidably matched with the corresponding base tubes, and a sealing member is arranged between the sliding member and the inner wall of the base tube.

[0011] Further preferably, the pipe-roof structure further comprises prefabricated filling blocks, which are fixed on the steel box structure, and the prefabricated filling blocks match the tunnel excavated by the tunneling equipment and support it.

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

[0013] Further preferably, a partition support is provided inside the base pipe, and the partition support divides the inside of the base pipe into N sealed cavities. The N sealed cavities meet the construction of pipe curtain structures in different directions, provide guide channels for excavation equipment, and at the same time, the partition support provides stability for the base pipe during construction.

[0014] A construction method of the underground space support system comprises the following steps: S1. Construction of foundation pipes: First, 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 curtain excavation equipment; S2. Replacement of the basic pipe in situ: The pulling and pushing mechanism pushes out or cuts off the whole or part of the basic pipe to form a single-pass pipe, and at the same time, the pipe curtain structure is constructed in situ to connect the corresponding two basic pipes to form a single-pass pipe structural unit; S3. Construction of double-pass pipes: A foundation pipe is constructed on one side of the single-pass pipe structural unit according to the support route. The foundation pipe is arranged corresponding to the single-pass pipe of the single-pass pipe structural unit to meet the requirements of the pipe curtain excavation equipment; then the pulling and pushing mechanism pushes out or cuts off the whole or part of the foundation pipe and the single-pass pipe, and at the same time, the pipe curtain structure is constructed in situ to connect the corresponding foundation pipe and the single-pass pipe to form a single-pass pipe + double-pass pipe structural unit; S4, repeat step S3 until a transversely penetrating support frame is formed according to the support route; S5. Filling a filling medium into the support frame in step S4 to form an overall support structure.

[0015] The working process of using the pulling and pushing mechanism to push out the base pipe part in step S2 is as follows: The original structure is provided on the side corresponding to the foundation pipe and the pipe curtain structure. The original structure of the two foundation pipes is arranged opposite to each other. The auxiliary parts are arranged at the starting end of the foundation pipe and it is ensured that the original structure can be pushed out. The pipe curtain structure is arranged at the tail of the tunneling equipment and the auxiliary parts. The auxiliary parts are connected to the traction device through a wire rope. The tunneling equipment and the auxiliary parts are pushed forward by the oil cylinder push of the tunneling equipment propulsion system and the reverse pull of the wire rope. The original structure is gradually pushed out from the starting end to the receiving end by the auxiliary parts, and an opening is formed in the foundation pipe. 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.

[0016] The working process of using the pulling and pushing mechanism to push out the entire base tube in step S2 is as follows: The auxiliary parts are arranged at the starting end of the foundation pipe, and the outer diameter of the auxiliary parts is ensured to match the foundation pipe. The pipe curtain structure and the N-way pipe are connected to the tail of the tunneling equipment and the auxiliary parts. The auxiliary parts are connected to the traction device through a wire rope. The tunneling equipment and the auxiliary parts are pushed forward by the oil cylinder push of the tunneling equipment propulsion system and the reverse pull of the wire rope. The foundation pipe as a whole is gradually pushed out from the starting end to the receiving end by the auxiliary parts, and the tunneling equipment excavates the stratum between the two foundation pipes to form an intermediate channel. At the same time, the N-way pipe is laid to 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 parts.

[0017] The working process of using the pulling and pushing mechanism to remove the base pipe part in step S2 is as follows: The original structure is provided on the side corresponding to the foundation pipe and the pipe curtain structure. The original structure of the two foundation pipes is arranged opposite to each other, and the auxiliary parts are arranged at the starting end of the foundation pipe, and it is ensured that the excavation cutter head of the tunneling equipment can cut the original structure. The pipe curtain structure is arranged at the tail of the tunneling equipment and the auxiliary parts; the auxiliary parts are connected to the traction device through a wire rope, and the tunneling equipment and the auxiliary parts are pushed forward by the oil cylinder push of the tunneling equipment propulsion system and the reverse pull of the 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.

[0018] The beneficial effects of the present invention are as follows: the underground support structure of the present invention is an in-situ replacement pipe curtain support structure that is integrally connected. Through in-situ replacement, the sections of the pipe curtain structure are formed into an integral 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 problem of complex connection operation and high construction difficulty of the pipe curtain support structure in the prior art. The underground support structure of the present invention cooperates with the excavation equipment through a traction device, and the auxiliary parts are connected to the traction parts by wire rope. Through the top push of the oil cylinder and the reverse pull of the wire rope, the equipment excavates forward and constructs the pipe curtain structure at the same time, which can ensure the safety of the foundation pipe construction and the synchronization of the in-situ replacement. Moreover, the traction device is used as an auxiliary power for forward excavation, which greatly improves the construction efficiency. In addition, the present invention also provides a construction method based on this type of pipe curtain support structure. The mechanized construction operation in the construction method is simple and convenient, and the construction process is diverse. Different forms of underground support structures can be formed to meet different engineering needs and achieve the effect of safe construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the two basic pipes of the present invention. Figure 2 The schematic diagram of the construction of the pipe-roof structure replacing the original structure in Scheme 1 is provided; Figure 3 This is a schematic diagram of the relationship between the excavation equipment and the opening position of the single connecting pipe in Scheme 1; Figure 4 This is a schematic diagram of the completed construction of a section of the pipe curtain structure in Scheme 1; Figure 5 This is a schematic diagram of the completion of the construction of the two sections of the pipe curtain structure in Scheme 1; Figure 6It is a schematic diagram of the basic pipe structure with different numbers of original structures in scheme 1; Figure 7 The schematic diagram of the construction of the pipe curtain structure and the single connecting pipe for the replacement of the basic pipe in Scheme 2 is presented; Figure 8 This is a schematic diagram of the completion of the three-section pipe curtain structure in Scheme 2; Fig. 9 This is a schematic diagram of the completion of the overall support structure in Scheme 2; Fig.10 This is a schematic diagram of the construction of the pipe curtain structure for replacing the cutting foundation pipe in Scheme 3. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 like Fig. 9 As shown, an underground space support system includes a support frame 10, and a filling medium 20 is applied inside the support frame 10 to form a support structure 8; the filling medium 20 can be reinforced concrete to form a stable underground support structure. The support frame 10 includes a plurality of foundation pipes 1, and two adjacent foundation pipes 1 are connected by a pipe curtain structure 3 applied by a traction mechanism; the pipe curtain structure 3 is engaged with the foundation pipe 1; an opening on the foundation pipe 1 is connected to a pipe curtain structure; a continuous support frame is formed to adapt to different support environments, and at the same time, the pipe curtain structure 3 applied by the traction mechanism has high connection strength, simple construction, strong operability, no soil exposure during the process, and a safe and reliable construction environment.

[0023] In this embodiment, as a preferred solution, a plurality of base pipes 1 are connected through a plurality of pipe curtain structures 3 to form a closed loop structure connected end to end or to form a one-stage or multi-stage open loop structure; the closed loop structure can be rectangular, circular or double rectangular. Fig. 9As shown. The one-segment or multi-segment open-loop structure can be a one-segment or multi-segment straight line, arc, curve or other structural forms. The pipe curtain structure 3 connects the corresponding two basic pipes 1 by pushing out or cutting off the basic pipe 1 in whole or in part through a pulling and pushing mechanism. The pulling and pushing mechanism pushes out a part of the basic pipe 1 to form an opening, and the pipe curtain structure 3 is slidably embedded in the opening to achieve the connection between the two basic pipes, or the pulling and pushing mechanism pushes out the entire part of the basic pipe 1, and then replaces it with a connecting pipe with an opening, and the pipe curtain structure 3 is slidably embedded in the opening to achieve the connection between the two basic pipes, and can be used for the repair of the basic pipeline. Or the pulling and pushing mechanism cuts off a part of the basic pipe 1 to form an opening, and the pipe curtain structure 3 is slidably embedded in the opening to achieve the connection between the two basic pipes. The above-mentioned mechanized construction is easy to operate and has high connection strength, meets the needs of different projects, and achieves the effect of safe construction.

[0024] As a preferred solution in this embodiment: the pulling and pushing mechanism includes an auxiliary part 4 pulled by a traction device, and the traction device is arranged at the corresponding receiving end, and a winch or the like can be used to pull the auxiliary part forward along the base pipe. The auxiliary part 4 is arranged on both sides of the excavation equipment 5, and is slidably matched with the corresponding base pipe 1; the pipe curtain structure 3 is connected to the tail of the auxiliary part 4 and can move synchronously with the auxiliary part 4. The pipe curtain structure 3 can also be connected to the tail of the excavation equipment and the auxiliary part, and move synchronously with them in a similar manner to pipe jacking construction. A traction device is arranged on the auxiliary part in the forward direction, and at the same time, it is recovered and moved forward by the excavation equipment at the arrival end, which speeds up the excavation efficiency and reduces the thrust of the oil cylinder of the excavation propulsion system. The push and pull make the excavation more stable.

[0025] Example 2 like Figure 2 As shown, an underground space support system, this embodiment is further optimized on the basis of embodiment 1: the auxiliary component 4 includes a front face plugging component 41 and a supporting component 43 that match the inner cavity of the base pipe 1, and the front face plugging component 41 slides to plug the cavity of the base pipe to prevent excavation water and soil from entering the channel. The supporting component 43 is fixed to the back of the front face plugging component 41, and the front part of the front face plugging component 41 is connected to the traction device set at the receiving end of the base pipe 1 through the traction component 42, and the body of the excavation equipment 5 is fixedly connected to the supporting component 43; the auxiliary components are located on both sides of the excavation equipment, providing a concave space to meet the working space of the cutter head of the excavation equipment, and the pipe curtain structure 3 is connected to the tail of the supporting component 43. Under the traction of the traction device and the pushing action of the excavation equipment 5, the auxiliary component 4 drives the pipe curtain structure 3 to move forward.

[0026] The pipe curtain structure 3 in this embodiment includes a steel box structure 31, which is welded from steel. The steel box structure 31 is embedded in the corresponding two base pipes 1 and slides with the base pipes 1. A seal is provided at the connection between the steel box structure 31 and the base pipe 1 to ensure the sealing of the connection between the pipe curtain structure and the base pipe. The steel box structure is arranged along the tunnel axis and supported by columns in the middle. Adjacent pipe curtain structures can be connected to each other to form an overall frame structure.

[0027] Preferably, according to the working conditions of the foundation pipe and the formation, the pipe curtain structure 3 further includes a sliding member 33, which is fixedly arranged on both sides of the steel box structure 31, filling the sealing cavity of the foundation pipe, and the sliding member 33 is slidably matched with the corresponding foundation pipe 1, and a sealing member is arranged between the sliding member 33 and the inner wall of the foundation pipe 1 to improve the sealing between the foundation pipe and the sliding member. The sliding member moves in the cavity structure of the connecting pipe and is connected to the connecting pipe by mortise and tenon, supporting the opening of the connecting pipe during the excavation process to ensure construction safety.

[0028] It should be pointed out that when the channel excavated by the cutterhead used in the tunneling equipment is inconsistent with the outer shape of the pipe curtain structure, the pipe curtain structure 3 also includes a prefabricated filling block 32, and the prefabricated filling block 32 can preferably be a prefabricated concrete filling block. The prefabricated filling block 32 is fixed on the steel box structure 31, and the prefabricated filling block 32 matches the tunnel excavated by the tunneling equipment 5 and supports it; the prefabricated filling block 32 fills the remaining space of the tunneling channel to ensure the stability of the surrounding strata. The prefabricated filling block 32 can be fixed to the steel box structure 31 by bolts, which is convenient for assembly. That is, when the cutterhead adopts a circular cutterhead, its excavation channel is circular, and the pipe curtain structure is a rectangular box structure. At this time, a semicircular prefabricated filling block is required to make up for the rest of the channel excavated by the cutterhead. At this time, it is composed of a steel box main structure, a semicircular sliding member and a prefabricated concrete filling structure; the pipe curtain structure fills the entire tunneling channel. When the cutterhead adopts a rectangular cutterhead, and the cross section of its excavation channel is consistent with the outer contour of the pipe curtain structure, no prefabricated filling block may be provided.

[0029] Example 3 like Figure 5 , 6 As shown, an underground space support system is provided. In this embodiment, based on embodiment 1 or 2, the base pipe 1 is provided with an original structure part 11 on the side corresponding to the pipe curtain structure 3. The original structure part 11 can be pushed out by an auxiliary part, or cut off by the cutter head of the excavation equipment; the pulling and pushing 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 N through pipes, N ≥ 1; the connecting pipe is formed by replacing the base pipe in situ, and the connecting pipe is provided with a full-length interlocking opening along the axial direction of the tunnel, and the opening is embedded with a pipe curtain structure, and one connecting pipe is provided with two openings, and one opening is connected to one pipe curtain structure. In this embodiment, N is preferably 1, 2, 3, or 4. Figure 5As shown, the single-pass tube 21 contains one original structure part 11, forming one opening, and the double-pass tube 22 contains two original structure parts 11, forming two openings. Figure 6 As shown, the three-way pipe 23 contains three original structure parts 11, which can form three openings; the four-way pipe 24 contains four original structure parts 11, which can form four openings. The opening of the connecting pipe is formed by replacing the original structure at the opening with a new structure. Taking the basic pipe with two original structures as an example, a single connecting pipe is formed by replacing one original structure of the basic pipe in situ, and one original structure remains; a double connecting pipe is formed by replacing the remaining original structure of the single connecting pipe in situ, and the double connecting pipe has no original structure.

[0030] In this embodiment, as preferred, Figure 6 As shown, the base pipe 1 is provided with a partition support 12, which divides the inside of the base pipe 1 into N sealed chambers. The peripheral surface of the sealed chamber includes an opening surface to meet the construction of the pipe curtain structure in different directions and provide a guide channel for the excavation equipment. The partition support 12 is a partition column, which corresponds to the column of the pipe curtain structure to form a horizontally penetrating support frame, and the material is filled into the frame to form an overall support structure.

[0031] Example 4 A construction method of an underground space support system as described in Embodiment 1, 2 or 3, comprising the following steps: S1. Construction of foundation pipes: First 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 curtain excavation equipment.

[0032] S2. Replacement of the basic tube in situ: The pulling and pushing mechanism pushes out the basic tube 1 as a whole, or cuts off / pushes out part of the basic tube 1 to form a single-pass tube, and at the same time, the tube curtain structure 3 is constructed in situ to connect the corresponding two basic tubes 1 to form a single-pass tube structural unit. When part of the basic tube 1 is cut off, one basic tube forms a corresponding opening, and the openings on the two basic tubes correspond to the two openings of the tube curtain structure 3, ensuring that the tube curtain structure 3 is embedded and engaged at the opening to ensure the stability of the support. When the basic tube 1 is pushed out as a whole, the basic tube with the opening is directly replaced in situ with the original basic tube, and the basic tube with the opening is directly replaced with the tube curtain structure 3 in an embedded and engaged manner to replace the in-situ basic tube.

[0033] S3. Construction of double-channel pipes: A foundation pipe 1 is constructed on one side of the single-channel pipe structural unit according to the support route. The foundation pipe 1 is arranged corresponding to the single-channel pipe of the single-channel pipe structural unit to meet the requirements of the pipe curtain excavation equipment. Then the pulling and pushing mechanism pushes out or cuts off the foundation pipe 1 and the single-channel pipe as a whole or in part, and at the same time, a pipe curtain structure 3 is constructed in situ to connect the corresponding foundation pipe 1 and the single-channel pipe to form a single-channel pipe + double-channel pipe structural unit.

[0034] S4. Repeat step S3 until a transversely connected support frame is formed according to the support route. It should be pointed out that after the construction of the single-connected pipe is completed, a new adjacent base pipe is built based on the designed support route, and then the single-connected pipe located at the connection node of the support structure is replaced in situ in the same way to form a double-connected pipe connecting two adjacent sections of the pipe curtain structure. Similarly, after the construction of the double-connected pipe is completed, a new adjacent base pipe is built based on the designed support route, and then the double-connected pipe located at the connection node of the support structure is replaced in situ in the same way to form a three-connected pipe connecting three adjacent sections of the pipe curtain structure. Similarly, the pipe curtain frame structure is constructed in sequence, and the adjacent pipe curtain structures are connected in the connecting pipe to form a transversely connected support frame.

[0035] S5. Filling a filling medium into the support frame in step S4. The filling medium may be reinforced cage concrete to form an integral support structure to ensure the stability of the support structure.

[0036] like Figures 1 to 6 As shown in the first implementation scheme, when the pulling and pushing mechanism is used to push out the base pipe 1 in step S2, the parameters such as the angle and position of the original structure of the base pipe need to be guaranteed, and the accuracy and quality are required to be high; the specific working process is: The original structure 11 is provided on the side corresponding to the base pipe 1 and the pipe curtain structure 3, and the original structure 11 in this scheme can be pushed out from the base pipe 1. The original structure 11 of the two base pipes 1 is arranged oppositely, and the auxiliary parts are arranged at the starting end of the base pipe 1 to ensure that the original structure 11 can be pushed out, and the pipe curtain structure 3 is arranged at the tail of the excavation equipment 5 and the auxiliary parts; the auxiliary parts are connected to the traction device through a wire rope, and the excavation equipment 5 and the auxiliary parts are pushed forward by the oil cylinder of the excavation equipment 5 propulsion system and the wire rope reverse pull; the original structure 11 is gradually pushed out from the starting end to the receiving end by the auxiliary parts to form an opening, and the base pipe 1 forms a single connecting pipe; the excavation 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 excavation equipment 5 and the auxiliary parts.

[0037] During the excavation process, the original structure is gradually pushed out from the starting end by the auxiliary parts, and the pipe curtain structure is embedded and slidably connected with the opening of the single connecting pipe through the passage of the auxiliary parts and the excavation equipment.

[0038] like Figures 7-9 As shown in the second implementation scheme, in step S2, when the pulling and pushing mechanism is used to push out the entire base pipe 1, the entire base pipe is used as the original structure, and the entire structure is replaced by replacing the base pipe in situ through the connecting pipe as a whole, so that each section of the pipe curtain structure is connected. The specific working process is: The auxiliary parts are arranged at the starting end of the base pipe 1, and the outer diameter of the auxiliary parts is ensured to match the base pipe 1. The pipe curtain structure 3 and the N-way pipe are connected to the excavation equipment 5 and the tail of the auxiliary parts; the N-way pipe here can be a double-way pipe or a three-way pipe; a sliding track is arranged at the opening of the connecting pipe, and the pipe curtain structure is connected to the connecting pipe through the sliding track, such as a CT-style connection along the tunnel direction, and the connecting pipe and the pipe curtain structure can slide. A sealing structure is arranged at the opening, and preferably, the sliding track is arranged on the pipe curtain structure, and grease is filled inwardly, which satisfies the lubrication of the slide groove and has a waterproof effect. The auxiliary parts are connected to the traction device through a steel wire rope. The tunneling equipment 5 and the auxiliary parts are pushed forward by the oil cylinder of the tunneling equipment 5 propulsion system and the steel wire rope. The foundation pipe 1 is gradually pushed out from the starting end to the receiving end by the auxiliary parts, and the tunneling equipment 5 excavates the stratum between the two foundation pipes 1 to form an intermediate channel. At the same time, the N-way 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-way pipe and the pipe curtain structure 3 can move forward with the tunneling equipment 5 and the auxiliary parts.

[0039] In the above-mentioned scheme 2, the steel box structure of the pipe curtain structure is embedded in the opening of the single connecting pipe, and the two are connected by a slide slot, and the slide slot is filled with grease during excavation; during the excavation process, the foundation pipe is gradually pushed out from the starting end by the auxiliary parts, and the pipe curtain structure and the single connecting pipe are set in the channel of the auxiliary parts and the excavation equipment to form a section of the pipe curtain structure. In this scheme 2, multiple pipe changes are required to ensure construction quality and efficiency.

[0040] like Fig.10 As shown in the third embodiment, the working process of using the pulling mechanism to remove part of the base tube 1 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 part in this scheme refers to the part cut off from the foundation pipe 1 during construction, and there is no special limitation on the foundation pipe. The original structure parts 11 of the two foundation pipes 1 are arranged opposite to each other, and the auxiliary parts are arranged at the starting end of the foundation pipe 1, and it is ensured that the excavation cutter head of the tunneling equipment 5 can cut the original structure part 11. The pipe curtain structure 3 is arranged at the tail of the tunneling equipment 5 and the auxiliary parts; the auxiliary parts are connected to the traction device through a wire rope, and the tunneling equipment 5 and the auxiliary parts are pushed forward by the oil cylinder of the tunneling equipment 5 propulsion system and the wire rope reverse pull; 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 parts.

[0041] In the above-mentioned scheme 3, during the excavation process, the excavation equipment cuts the foundation pipe to form a single connecting pipe, the auxiliary parts temporarily support the single connecting pipe within a certain range, the pipe curtain structure is slidably connected to the single connecting pipe, moves with the auxiliary parts and the excavation equipment, and supports the opening of the single connecting pipe; after the construction of the single connecting pipe is completed, the single connecting pipe is cut in situ in the same way, the auxiliary parts are guided and sealed in the cavity structure, and connected to the excavation equipment to move the pipe curtain structure, and after the cutting is completed, a double connecting pipe connected by two sections of the pipe curtain structure is formed. Similarly, the pipe curtain frame structure is constructed in sequence, one double connecting pipe connects two pipe curtain structures, and adjacent pipe curtain structures are connected in the connecting pipe to form a horizontally penetrating support frame, and then concrete is filled into the support structure frame to form an overall support structure.

[0042] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An underground space support system, characterized in that: It comprises a support frame (10), in which a filling medium (20) is applied to form a support structure (8); the support frame (10) comprises a plurality of base pipes (1), and two adjacent base pipes (1) are connected by a pipe curtain structure (3) applied by a pulling and pushing mechanism.

2. The underground space support system according to claim 1, characterized in that: A plurality of base pipes (1) are connected through a plurality of pipe curtain structures (3) to form a closed loop structure connected end to end or to form a one-stage or multi-stage open loop structure; the pipe curtain structure (3) connects two corresponding base pipes (1) by pushing out or cutting off the base pipe (1) in whole or in part through a pulling mechanism.

3. The underground space support system according to claim 1 or 2, characterized in that: The pulling and pushing mechanism comprises an auxiliary part (4) pulled by a pulling device, the auxiliary part (4) being arranged on both sides of the excavation equipment (5) and slidingly matched with the corresponding base pipe (1); the pipe curtain structure (3) is connected to the rear of the auxiliary part (4) and can move synchronously with the auxiliary part (4).

4. The underground space support system according to claim 3 is characterized in that: The auxiliary component (4) comprises a front face plugging component (41) and a supporting component (43) that match the inner cavity of the base pipe (1); the supporting component (43) is fixed to the back of the front face plugging component (41); the front portion of the front face plugging component (41) is connected to a traction device provided at a receiving end of the base pipe (1) via a traction component (42); the tunneling equipment (5) is fixedly connected to the supporting component (43); the pipe curtain structure (3) is connected to the rear of the supporting component (43); and the auxiliary component (4) drives the pipe curtain structure (3) to move forward under the traction of the traction device and the pushing action of the tunneling equipment (5).

5. The underground space support system according to claim 1 or 2, characterized in that: The tube curtain structure (3) comprises a steel box structure (31), the steel box structure (31) being embedded in two corresponding base tubes (1) and slidingly matched with the base tubes (1), and a sealing member being provided at the connection between the steel box structure (31) and the base tubes (1).

6. The underground space support system according to claim 5, characterized in that: The tube curtain structure (3) further comprises sliding members (33), which are fixedly arranged on both sides of the steel box structure (31) and slidably matched with the corresponding base tubes (1), and a sealing member is arranged between the sliding member (33) and the inner wall of the base tube (1).

7. The underground space support system according to claim 6, characterized in that: The pipe curtain structure (3) further comprises a prefabricated filling block (32), wherein the prefabricated filling block (32) is fixed on the steel box structure (31), and the prefabricated filling block (32) matches the tunnel excavated by the excavation equipment (5) and supports the tunnel.

8. 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), and the pulling and pushing mechanism pushes out or cuts off the original structure part (11) to form an opening of the base pipe (1); the base pipe (1) having N openings forms N through pipes, where N is greater than or equal to 1; a partition support (12) is provided inside the base pipe (1), and the partition support (12) divides the inside of the base pipe (1) into N sealed cavities.

9. A construction method of an underground space support system according to any one of claims 1 to 8, characterized in that: Here are the steps: S1. Construction of foundation pipes: First, two adjacent foundation pipes (1) are constructed according to the support route, and the distance between the two foundation pipes (1) is ensured to meet the requirements of the pipe curtain excavation equipment; S2. Replacement of the basic pipe in situ: the pulling and pushing mechanism pushes out or cuts off the basic pipe (1) in whole or in part to form a single-pass pipe, and at the same time, the pipe curtain structure (3) is constructed in situ to connect the corresponding two basic pipes (1) to form a single-pass pipe structural unit; S3, constructing a double-pass pipe: constructing a foundation pipe (1) on one side of the single-pass pipe structural unit according to the support route, and the foundation pipe is arranged corresponding to the single-pass pipe of the single-pass pipe structural unit to meet the requirements of the pipe curtain excavation equipment; then the pulling and pushing mechanism pushes out or cuts off the foundation pipe (1) and the single-pass pipe in whole or in part, and at the same time constructs the pipe curtain structure (3) in situ to connect the corresponding foundation pipe (1) and the single-pass pipe, so as to form a single-pass pipe + double-pass pipe structural unit; S4, repeat step S3 until a transversely penetrating support frame is formed according to the support route; S5. Filling a filling medium into the support frame in step S4 to form an overall support structure.

10. The construction method of the underground space support system according to claim 9, characterized in that: The working process of using the pulling and pushing mechanism to push out the base tube (1) in step S2 is as follows: An original structure (11) is provided on the side corresponding to the base pipe (1) and the pipe-roof structure (3); the original structure (11) of the two base pipes (1) are arranged opposite to each other; the auxiliary component is arranged at the starting end of the base pipe (1) and ensures that the original structure (11) can be pushed out; the pipe-roof structure (3) is arranged at the tail of the excavation equipment (5) and the auxiliary component; the auxiliary component is connected to the traction device through a steel wire rope; the excavation equipment (5) and the auxiliary component are pushed forward by the oil cylinder of the excavation equipment (5) propulsion system and the steel wire rope; The original structure (11) is gradually pushed out from the starting end to the receiving end by the auxiliary parts, the foundation pipe (1) forms an opening, and the excavation 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 excavation equipment (5) and the auxiliary parts; The working process of using the pulling and pushing mechanism to push out the entire base tube (1) in step S2 is as follows: The auxiliary component is arranged at the starting end of the foundation pipe (1), and the outer diameter of the auxiliary component is ensured to match the foundation pipe (1). The pipe curtain structure (3) and the N-type pipe are connected to the rear of the tunneling equipment (5) and the auxiliary component. The auxiliary component is connected to the traction device via a steel wire rope. The tunneling equipment (5) and the auxiliary component are pushed forward by the oil cylinder of the tunneling equipment (5) propulsion system and the steel wire rope. The foundation pipe (1) is gradually pushed out 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-type 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-type pipe and the pipe curtain structure (3) can move forward with the tunneling equipment (5) and the auxiliary component. The working process of using the pulling and pushing mechanism to remove part of the base tube (1) in step S2 is as follows: The base pipe (1) and the pipe curtain structure (3) are provided with an original structure part (11) on the side corresponding to the base pipe (1). The original structure parts (11) of the two base pipes (1) are arranged opposite to each other. The auxiliary parts are arranged at the starting end of the base pipe (1), and it is ensured that the excavation cutter head of the tunneling equipment (5) can cut the original structure part (11). The pipe curtain structure (3) is arranged at the tail of the tunneling equipment (5) and the auxiliary parts. The auxiliary parts are connected to the traction device through a wire rope. The tunneling equipment (5) and the auxiliary parts are pushed forward by the oil cylinder of the tunneling equipment (5) propulsion system and the wire rope. The tunneling equipment (5) cuts the base pipe (1) to form an opening, and 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 parts.

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