A large-span underground space structure

Abstract

The application discloses a large-span underground space structure and relates to the technical field of underground space structures. The cross beams are symmetrically arranged on the two sides of arc plates, the two ends of the arc plates are fixedly installed with the cross beams, a plurality of sets of supporting mechanisms are arranged in the arc plates, first arc frames and second arc frames are symmetrically arranged on the second sliding rails of the cross beams, the radii of the first arc frames and the second arc frames are equal, arc column rods are slidingly installed on the arc rails of the first arc frames, the arc column rods are engaged with the arc grooves of the second arc frames, and the self-locking assemblies on the two sides of the arc column rods limit the positions of the arc column rods; the limiting plates are transversely slidingly installed on the rectangular holes of the cross beams, and the limiting plates are pushed to the third clamping grooves by the first arc frames and the second arc frames under the assistance of the connecting wedges. The application has the beneficial effects that the cross beams are assisted by the plurality of sets of supporting mechanisms, are suitable for underground spaces with different sizes, the first arc frames and the second arc frames are subjected to vertical forces when the arc plates are decomposed, the underground spaces are more stable, transportation and installation are facilitated, and costs are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground space structures, and in particular to a large-span underground space structure. Background Art

[0002] Underground space structures are structures buried inside the ground floor. As people's demand for underground space increases, the forms of underground space structures tend to be diversified, and higher requirements are also placed on the technology of large-span space structures.

[0003] A Chinese utility model patent application with prior art application number CN217782143U discloses a novel underground space structure, wherein a concrete layer is connected to the inner wall of a steel structure layer. The steel structure layer is a prefabricated component, and the concrete layer is a prefabricated component or a cast-in-place component. The steel structure layer serves as the outer mold for casting the concrete layer and also as an estimate for the concrete layer. The steel structure layer and the concrete layer are connected as an integrated structure, sharing the load. No binding reinforcement is required in the concrete layer. The steel structure layer includes a corrugated steel outer shell plate, which is connected to the inner wall of the outer shell plate. The inner side of the corrugated steel plate is arranged at the side wall. Multiple steel bars are connected between the inner side of the corrugated steel plate and the bottom plate of the underground space segment. The steel bars are connected to embedded parts, which are arranged in the concrete layer. The inner side of the corrugated steel plate is connected to an inner top steel plate. Embedded corbels are arranged at the inner side of the side wall top, and the inner side of the side wall top is fixedly connected to the end of the inner top steel plate. At least one partition wall is provided in the underground space segment.

[0004] Although the existing technology can solve the technical problem of large span of underground structure space, there is no need to tie steel bars on site, close and dismantle molds, the construction speed is fast, the construction period is short, the shape and scale of the underground space are not restricted, it is light weight, high strength, corrosion resistance and long service life, but the casting is more troublesome, and the structure has deformation and other damage problems, maintenance is more troublesome, and it is not conducive to transportation. Therefore, there is an urgent need for a large-span underground space structure. Summary of the Invention

[0005] In response to the above technical problems, the technical solution adopted by the present invention is as follows: a large-span underground space structure, including a main body mechanism and a limiting mechanism, the main body structure includes two groups of beams and arc plates, the beams are symmetrically arranged on both sides of the arc plates, the two ends of the arc plates are respectively fixedly mounted on the beams, multiple groups of supporting mechanisms are arranged inside the arc plates, the first arc frame and the second arc frame of the supporting mechanism are symmetrically arranged on the second slide rails of the two groups of beams, the radius of the first arc frame and the second arc frame are equal, and a self-locking mechanism is provided on the first arc frame, the self-locking mechanism includes an arc column rod, two groups of self-locking components The arc column rod is slidably installed on the arc track of the first arc frame, and the arc column rod is engaged with the arc groove of the second arc frame. Two sets of self-locking components are symmetrically arranged on both sides of the arc column rod, and the self-locking components limit the position of the arc column rod; the first arc frame and the second arc frame correspond to a set of limiting mechanisms respectively, and a third slot is provided inside the crossbeam. The limiting mechanism includes a limiting plate and a connecting wedge. The limiting plate is laterally slidably installed on the rectangular hole of the crossbeam, and the connecting wedge is provided between the second slide rail and the third slot. With the assistance of the connecting wedge, the limiting plate pushes the first arc frame and the second arc frame to the third slot.

[0006] Furthermore, the first and second arc frames are coaxial and in close contact with the arc plate. The first and second arc frames support the arc plate and assist each other in reducing the pressure on the arc plate, thereby facilitating replacement of the first and second arc frames if they become damaged.

[0007] Furthermore, the first arc bracket is symmetrically provided with pin holders, with one set of self-locking components corresponding to one set of pin holders. The self-locking components include a self-locking wedge and a self-locking spring. A key shaft is fixedly mounted on the self-locking wedge, which is slidably mounted on the pin holder. The self-locking spring is disposed between the pin holder and the self-locking wedge, which is slidably mounted on the key shaft. A baffle is provided at the tail of the key shaft. When the two sets of baffles are manually pushed in opposite directions, the baffles drive the self-locking wedges to slide in opposite directions via the key shaft, compressing the self-locking spring and increasing the distance between the two sets of self-locking wedges, thereby facilitating the disconnection between the arc column rod and the arc groove.

[0008] Furthermore, a rectangular block is provided on the arc column rod, which is disposed between the two sets of self-locking components. The rectangular block contacts and cooperates with the inclined surface of the self-locking wedge, and the rectangular block contacts and cooperates with the right-angled surface of the self-locking wedge. When the rectangular block is pushed, the arc column rod slides toward the second arc frame. The rectangular block contacts the inclined surface of the self-locking wedge, and the two sets of self-locking wedges are pushed to drive the key shaft to move in opposite directions on the pin seat. The self-locking spring is compressed until the arc column rod slides into the arc groove. The rectangular block contacts and cooperates with the right-angled surface of the self-locking wedge. At this time, under the elastic action of the two sets of self-locking springs, the two sets of self-locking wedges are driven to move toward each other until the two sets of self-locking wedges return to their initial positions. Under the restraining action of the right-angled surfaces, the two sets of self-locking wedges fix the position of the rectangular block.

[0009] Furthermore, the limiting mechanism also includes a power assembly, which is disposed within the crossbeam and includes a driving shaft and a screw. The driving shaft is rotatably mounted within the crossbeam, a driving bevel gear is fixedly mounted on the end of the driving shaft, and the screw is rotatably mounted within the rectangular hole, a driven bevel gear is fixedly mounted on the end of the screw, and the driving bevel gear and the driven bevel gear are meshed. When the driving shaft is rotated, the driving shaft drives the driving bevel gear to rotate, and the driving bevel gear drives the screw to rotate via the driven bevel gear.

[0010] Furthermore, the screw rod is rotatably mounted on a limit plate, and a thread is provided at a rotation connection between the limit plate and the screw rod. When the screw rod rotates, the limit plate is driven to slide laterally on the screw rod.

[0011] Furthermore, the depth of the third slot is less than that of the second slide rail, the sloped end of the connecting wedge is coplanar with the third slot, and the sloped tail of the connecting wedge is coplanar with the second slide rail. Under the sloped transition of the connecting wedge, the limit plate pushes the first and second arc frames from the second slide rail to the third slot, raising the first and second arc frames to provide sufficient support for the arc plate.

[0012] Compared with the prior art, the present invention has the following advantages: (1) the present invention is provided with a main body mechanism, which cooperates with multiple groups of supporting mechanisms, is suitable for underground spaces of different sizes, and is convenient for transportation and installation; (2) the present invention is provided with multiple groups of supporting mechanisms, and under the auxiliary action of the arc column rod, the first arc frame and the second arc frame decomposition arc plate are subjected to vertical force, and the two groups of self-locking components assist in limiting the position of the arc column rod, thereby facilitating the replacement of the first arc frame and the second arc frame and saving maintenance costs; (3) the present invention is provided with a limiting mechanism, which uses a power component to drive the limiting plate to move. Under the transition action of the connecting wedge, the limiting plate pushes the first arc frame and the second arc frame from the second slide rail to the third slot, so that the first arc frame and the second arc frame rise in height, thereby providing sufficient support force for the arc plate and making the underground space more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the first viewing angle of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the second viewing angle of the overall structure of the present invention.

[0015] Figure 3 It is the front view of the present invention.

[0016] Figure 4 It is a left view of the present invention.

[0017] Figure 5 for Figure 3 Cross-section view in the AA direction.

[0018] Figure 6 for Figure 4 Cross-sectional view along the middle BB direction.

[0019] Figure 7 for Figure 4 Cross-sectional view in the mid-CC direction.

[0020] Figure 8 for Figure 7 A partial enlarged view of part D.

[0021] Figure 9 for Figure 2 A partial enlarged view of part E in the middle.

[0022] Figure 10 for Figure 6 A partial enlarged view of part F in the middle.

[0023] Figure 11 for Figure 5 A partial enlarged view of part G in the middle.

[0024] Figure numbers: 11-support frame; 12-crossbeam; 13-arc plate; 121-first slot; 122-second slide rail; 123-third slot; 124-rectangular hole; 21-first arc frame; 22-second arc frame; 211-arc rail; 212-pin seat; 221-arc slot; 31-arc column rod; 32-self-locking assembly; 311-rectangular block; 321-self-locking wedge; 322-key shaft; 323-self-locking spring; 41-power assembly; 42-limiting plate; 43-connecting wedge; 411-driving shaft; 412-driving bevel gear; 413-driven bevel gear; 414-screw; 3221-baffle. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] A large-span underground space structure includes a main body and a limiting mechanism. The main structure includes two groups of beams 12 and arc plates 13. The beams 12 are symmetrically arranged on both sides of the arc plates 13. The two ends of the arc plates 13 are respectively fixedly mounted on the beams 12. Multiple groups of supporting mechanisms are arranged inside the arc plates 13. The first arc frame 21 and the second arc frame 22 of the supporting mechanism are symmetrically arranged on the second slide rails 122 of the two groups of beams 12. The radius of the first arc frame 21 and the second arc frame 22 are equal. A self-locking mechanism is provided on the first arc frame 21. The self-locking mechanism includes an arc column rod 31 and two groups of self-locking components 32. The arc column rod 31 is slidably mounted on the arc track 211 of the first arc frame 21. The arc column rod 31 engages with the arc groove 221 of the second arc frame 22, and two groups of self-locking components 32 are symmetrically arranged on both sides of the arc column rod 31, and the self-locking components 32 limit the position of the arc column rod 31; the first arc frame 21 and the second arc frame 22 correspond to a group of limiting mechanisms respectively, and a third card groove 123 is provided inside the crossbeam 12. The limiting mechanism includes a limiting plate 42 and a connecting wedge 43. The limiting plate 42 is laterally slidably installed on the rectangular hole 124 of the crossbeam 12, and the connecting wedge 43 is provided between the second slide rail 122 and the third card groove 123. With the assistance of the connecting wedge 43, the limiting plate 42 pushes the first arc frame 21 and the second arc frame 22 to the third card groove 123.

[0027] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 10As shown, the main mechanism includes a support frame 11, a beam 12, and an arc plate 13. There are multiple groups of support frames 11, which are fixedly installed on the ground of the underground space. Two groups of beams 12 are symmetrically arranged on the support frames 11. The beams 12 and the support frames 11 are fixedly installed. The beams 12 are symmetrically arranged on both sides of the arc plate 13. Both ends of the arc plate 13 are fixedly installed on the beams 12. Multiple groups of supporting mechanisms are arranged in sequence inside the arc plate 13. Mounting grooves are arranged in sequence on the beams 12. The two symmetrical groups of mounting grooves on the two groups of beams 12 correspond to one group of supporting mechanisms. The supporting mechanism includes a first arc frame 21 and a second arc frame 22. The radius of the first arc frame 21 and the second arc frame 22 are equal. The first arc frame 21 and the second arc frame 22 correspond to one group of beams 12 respectively. The arc frame 21 is set on one group of cross beams 12, and the second arc frame 22 is symmetrically set on another group of cross beams 12. The first arc frame 21 and the second arc frame 22 are coaxial, and the first arc frame 21 and the second arc frame 22 are in close contact with the arc plate 13 respectively; the installation groove includes a first card groove 121, a second slide rail 122, a third card groove 123, and a rectangular hole 124. The depth of the third card groove 123 is less than the depth of the second slide rail 122. The bottom of the first arc frame 21 and the second arc frame 22 are in contact with the installation groove. The bottom of the first arc frame 21 and the second arc frame 22 slide from the first card groove 121 into the second slide rail 122, and slide from the second slide rail 122 to the third card groove 123. The width of the first card groove 121 is less than the sum of the widths of the second slide rail 122 and the third card groove 123.

[0028] The main structure and the supporting structure can be set up in multiple groups as needed to adapt to the length of the underground space. The width and radius of the arc plate 13, the first arc frame 21 and the second arc frame 22 can be determined as needed to adapt to the width of the underground space, thereby facilitating transportation and installation and providing convenience for subsequent maintenance.

[0029] like Figure 1 、 Figure 2 、 Figure 8 、 Figure 9As shown, the self-locking mechanism includes an arc column rod 31 and two sets of self-locking components 32. An arc track 211 is provided inside the first arc frame 21. Two sets of pin seats 212 are symmetrically provided on the first arc frame 21. An arc groove 221 is provided inside the second arc frame 22. The arc column rod 31 is slidably installed on the arc track 211 of the first arc frame 21. The arc column rod 31 is engaged with the arc groove 221 of the second arc frame 22. The two sets of self-locking components 32 are symmetrically provided on both sides of the arc column rod 31. One set of self-locking components 32 corresponds to one set of pin seats 212. The self-locking components 32 The self-locking wedge 321 includes a key shaft 322 and a self-locking spring 323. The key shaft 322 is fixedly mounted on the self-locking wedge 321. The key shaft 322 is slidably mounted on the pin seat 212. The self-locking spring 323 is arranged between the pin seat 212 and the self-locking wedge 321. The self-locking spring 323 is slidably mounted on the key shaft 322. A rectangular block 311 is provided on the arc column rod 31. The rectangular block 311 is arranged between the two sets of self-locking components 32. The rectangular block 311 contacts and cooperates with the inclined surface of the self-locking wedge 321. The rectangular block 311 is provided between the two sets of self-locking components 32. When the lock is unlocked, the lock 310 is unlocked, and the lock 310 is unlocked. The lock 310 is unlocked, and the lock 310 is unlocked. The lock 310 is unlocked, and the lock 310 is unlocked. The locking wedges 321 move toward each other until the two sets of self-locking wedges 321 return to their initial positions. Under the restriction of the right-angled surface, the two sets of self-locking wedges 321 fix the position of the rectangular block 311; a baffle 3221 is provided at the tail end of the key shaft 322, and the two sets of baffles 3221 are manually pushed to move backwards. The baffles 3221 drive the self-locking wedges 321 to slide backwards through the key shaft 322, and the self-locking springs 323 are compressed. The distance between the two sets of self-locking wedges 321 increases, making it easier to disconnect the engagement between the arc column rod 31 and the arc groove 221.

[0030] like Figure 1 、 Figure 5 、 Figure 6 、 Figure 10 、 Figure 11As shown, there are multiple groups of limiting mechanisms, one group of limiting mechanisms corresponds to one group of mounting grooves, and the two symmetrical groups of limiting mechanisms on the two groups of beams 12 correspond to one group of supporting mechanisms. The limiting mechanism includes a power assembly 41, a limiting plate 42, and a connecting wedge 43. The power assembly 41 is arranged inside the beam 12. The power assembly 41 includes a driving shaft 411, a driving bevel gear 412, a driven bevel gear 413, and a screw rod 414. The driving shaft 411 is rotatably installed inside the beam 12, the driving bevel gear 412 is fixedly installed at the end of the driving shaft 411, the screw rod 414 is rotatably installed inside the rectangular hole 124, the driven bevel gear 413 is fixedly installed at the end of the screw rod 414, the driving bevel gear 412 is meshed with the driven bevel gear 413, and the driving shaft 411 is rotated. The driving shaft 411 drives the driving bevel gear 412 to rotate, and the driving bevel gear 412 is driven through the driven bevel gear 413. Drive the screw rod 414 to rotate; the limit plate 42 is slidably installed on the rectangular hole 124 of the crossbeam 12, and a thread is provided at the rotation connection between the limit plate 42 and the screw rod 414. When the screw rod 414 rotates, it drives the limit plate 42 to slide horizontally on the screw rod 414, and the limit plate 42 contacts and cooperates with the first arc frame 21 and the second arc frame 22; the connecting wedge 43 is provided between the third clamping groove 123 and the second slide rail 122, and the slope end of the connecting wedge 43 and the third clamping groove 123 are in the same plane, and the slope tail of the connecting wedge 43 and the second slide rail 122 are in the same plane. Under the slope transition of the connecting wedge 43, the limit plate 42 pushes the first arc frame 21 and the second arc frame 22 from the second slide rail 122 to the third clamping groove 123, so that the first arc frame 21 and the second arc frame 22 rise in height, thereby providing sufficient supporting force for the arc plate 13.

[0031] Working principle: First, carry out underground excavation project, adopt underground excavation method with less impact on the social environment on the ground, and do not damage the ground. As the excavation project proceeds, the support frame 11 is symmetrically fixed on the ground of the underground space, and the beam 12 is symmetrically fixed above the support frame 11. The number of support frames 11 and beams 12 needs to be adjusted according to the length of the underground space, and the two ends of the arc plate 13 are respectively fixed on the beam 12.

[0032] After the main part is installed, the first arc frame 21 is installed on the installation groove of a group of cross beams 12. The bottom of the first arc frame 21 slides from the first slot 121 to the inside of the second slide rail 122. At this time, the limit plate 42 is at the end of the screw rod 414, and the active shaft 411 is rotated. The active shaft 411 drives the active bevel gear 412 to rotate, and the active bevel gear 412 drives the screw rod 414 to rotate through the driven bevel gear 413. When the screw rod 414 rotates, it drives the limit plate 42 to slide horizontally on the screw rod 414. The limit plate 42 contacts and cooperates with the first arc frame 21, driving the first arc frame 21 to slide toward the third slot 123. Under the slope transition of the connecting wedge 43, the limit plate 42 pushes the first arc frame 21 from the second slide rail 122 to the third slot 123, so that the first arc frame 21 rises to a higher height, thereby providing sufficient support force for the arc plate 13.

[0033] The second arc frame 22 is installed in the symmetrical mounting grooves on another set of crossbeams 12. The bottom of the second arc frame 22 slides from the first slot 121 to the inside of the second slide rail 122. At this time, the limit plate 42 is at the end of the screw rod 414, and the active shaft 411 is rotated. The active shaft 411 drives the active bevel gear 412 to rotate. The active bevel gear 412 drives the screw rod 414 to rotate through the driven bevel gear 413. When the screw rod 414 rotates, it drives the limit plate 42 to slide horizontally on the screw rod 414. The limit plate 42 contacts and cooperates with the first arc frame 21, driving the second arc frame 22 to slide toward the third slot 123. Under the slope transition of the connecting wedge 43, the limit plate 42 pushes the second arc frame 22 from the second slide rail 122 to the third slot 123, so that the second arc frame 22 rises to a higher height, thereby providing sufficient support force for the arc plate 13.

[0034] When the locking cam 321 is in the unlocked position, the locking cam 322 is locked and the locking cam 323 is unlocked.

[0035] As the underground space becomes larger and larger, repeat the above steps and install multiple sets of support mechanisms to prevent landslides and ensure the smooth progress of underground excavation.

[0036] When the first arc frame 21 or the second arc frame 22 in the support mechanism is damaged and needs to be replaced, the two sets of baffles 3221 on the first arc frame 21 of the damaged support mechanism are manually pushed to move backwards, and the baffles 3221 drive the self-locking wedge 321 to slide backwards through the key shaft 322, and the self-locking spring 323 is compressed. The distance between the two sets of self-locking wedges 321 increases, which facilitates the disconnection between the arc column rod 31 and the arc groove 221, thereby disconnecting the first arc frame 21 and the second arc frame 22 of the damaged support mechanism, making it easier to replace the first arc frame 21 and the second arc frame 22. The corresponding positions of the damaged first arc frame 21 and the second arc frame 22 are rotated in the opposite direction. The driving shaft 411 on the installation slot drives the driving bevel gear 412 to rotate. The driving bevel gear 412 drives the screw rod 414 to rotate through the driven bevel gear 413. When the screw rod 414 rotates, it drives the limit plate 42 to slide horizontally on the screw rod 414, disconnecting the contact between the limit plate 42 and the first arc frame 21 and the second arc frame 22 until the limit plate 42 slides to the end of the screw rod 414. Pull the first arc frame 21 or the second arc frame 22 from the third slot 123 to the second slide rail 122, and remove it from the first slot 121. Repeat the above steps to install the new first arc frame 21 and the second arc frame 22.

[0037] The present invention is not limited to the above-mentioned specific implementation methods. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work are all within the scope of protection of the present invention.

Claims

1. A large-span underground space structure, comprising a main structure and a limiting mechanism, characterized in that: The main structure comprises two groups of cross beams (12) and arc plates (13), the cross beams (12) are symmetrically arranged on both sides of the arc plates (13), and the two ends of the arc plates (13) are respectively fixedly mounted on the cross beams (12), and multiple groups of supporting mechanisms are arranged inside the arc plates (13), and the first arc frame (21) and the second arc frame (22) of the supporting mechanisms are symmetrically arranged on the second slide rails (122) of the two groups of cross beams (12), the radius of the first arc frame (21) and the second arc frame (22) are equal, and the first arc frame (21) is provided with a self-locking mechanism, and the self-locking mechanism comprises an arc column rod (31) and two groups of self-locking components (32), the arc column rod (31) is slidably mounted on the arc rail (211) of the first arc frame (21), and the arc column rod (31) and the second arc frame (22) are symmetrically mounted on the arc rail (211) of the first arc frame (21). The arc groove (221) is engaged, and two groups of self-locking components (32) are symmetrically arranged on both sides of the arc column rod (31), and the self-locking components (32) limit the position of the arc column rod (31); the first arc frame (21) and the second arc frame (22) respectively correspond to a group of limiting mechanisms, and a third clamping groove (123) is arranged inside the crossbeam (12), and the limiting mechanism includes a limiting plate (42) and a connecting wedge (43); the limiting plate (42) is laterally slidably installed on the rectangular hole (124) of the crossbeam (12), and the connecting wedge (43) is arranged between the second slide rail (122) and the third clamping groove (123); the limiting plate (42) is assisted by the connecting wedge (43) to push the first arc frame (21) and the second arc frame (22) to the third clamping groove (123); A pin seat (212) is symmetrically arranged on the first arc frame (21), a group of self-locking components (32) corresponds to a group of pin seats (212), the self-locking components (32) include a self-locking wedge (321) and a self-locking spring (323), a key shaft (322) is fixedly installed on the self-locking wedge (321), the key shaft (322) is slidably installed on the pin seat (212), the self-locking spring (323) is arranged between the pin seat (212) and the self-locking wedge (321), the self-locking spring (323) is slidably installed on the key shaft (322), and a baffle (3221) is provided at the tail of the key shaft (322); A rectangular block (311) is provided on the arc column rod (31), and the rectangular block (311) is provided between the two groups of self-locking components (32). The rectangular block (311) contacts and cooperates with the inclined surface of the self-locking wedge (321), and the rectangular block (311) contacts and cooperates with the right-angle surface of the self-locking wedge (321).

2. A large-span underground space structure according to claim 1, characterized in that: The first arc frame (21) and the second arc frame (22) are coaxial, and the first arc frame (21) and the second arc frame (22) are in close contact with the arc plate (13) respectively.

3. The large-span underground space structure according to claim 1, characterized in that: The limiting mechanism further comprises a power assembly (41), which is arranged inside the crossbeam (12). The power assembly (41) comprises a driving shaft (411) and a screw rod (414). The driving shaft (411) is rotatably mounted inside the crossbeam (12), a driving bevel gear (412) is fixedly mounted at the end of the driving shaft (411), the screw rod (414) is rotatably mounted inside the rectangular hole (124), a driven bevel gear (413) is fixedly mounted at the end of the screw rod (414), and the driving bevel gear (412) is meshed with the driven bevel gear (413).

4. The large-span underground space structure according to claim 3, characterized in that: The screw rod (414) is rotatably mounted on the limiting plate (42), and a thread is provided at the rotation connection between the limiting plate (42) and the screw rod (414).

5. The large-span underground space structure according to claim 1, characterized in that: The depth of the third slot (123) is less than that of the second slide rail (122); the slope end of the connecting wedge (43) and the third slot (123) are in the same plane; and the slope tail of the connecting wedge (43) and the second slide rail (122) are in the same plane.

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