Steel arch with telescopic longitudinal joints

Abstract

The utility model relates to the technical field of tunnel supporting, in particular to a steel arch with telescopic longitudinal joints, which comprises two steel arches and a plurality of longitudinal joint devices, the plurality of longitudinal joint devices are positioned between the two steel arches and are distributed at intervals along the radian direction of the steel arches, and the two steel arches are distributed along the diameter-depth direction of a tunnel; the longitudinal connection device comprises a telescopic assembly and two inserting assemblies, the telescopic assembly comprises a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are coaxially arranged, one end of the first connecting rod is hollow, one end of the second connecting rod is inserted into the first connecting rod, and the second connecting rod is slidably connected to the first connecting rod; the second connecting rod slides in a reciprocating mode in the length direction of the first connecting rod, the first connecting rod and the second connecting rod form a longitudinal connecting rod, the two inserting assemblies are connected to one end of the longitudinal connecting rod respectively, and the inserting assemblies are connected with a steel arch frame; the length of the longitudinal connection device can be flexibly adjusted, so that the longitudinal connection device can adapt to steel arches with different intervals.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of tunnel support, in particular to a steel arch with telescopic longitudinal connection. BACKGROUND

[0002] Tunnel initial support refers to supporting the tunnel surrounding rock during tunnel excavation to ensure the stability and safety of the tunnel, and the support measures include geological prediction, anchor rod support, sprayed concrete support, steel arch support and the like, and the purpose of the support measures is to prevent stratum collapse, control underground water, reduce ground subsidence and the like. During tunnel excavation, the design and construction of the tunnel initial support are crucial, and the tunnel initial support has an important influence on the whole operation cycle of the tunnel; and for tunnel construction with poor geological conditions and large surrounding rock deformation, a steel arch is usually used in the initial support of the surrounding rock, and an I-shaped steel is the most commonly used structural form; in order to increase the overall rigidity of the steel arch, different section steel arches are usually longitudinally connected.

[0003] At present, a commonly used connection method is to weld a steel bar or a steel plate on the adjacent steel arch after the steel arch is erected, and the steel bar or the steel plate with a fixed length is welded and fixed longitudinally, and the design is simple and reliable, but cannot adapt to steel arches with different intervals, resulting in that the steel arches cannot be installed in some cases, the method has large workload, the construction quality is difficult to guarantee and the efficiency is low, and the safety is poor when the tunnel has explosive gas such as gas.

[0004] According to the related art, although the welding of the steel bar or the steel plate on the adjacent steel arch can strengthen the connection strength of the two adjacent steel arches, the steel bar or the steel plate cannot adapt to steel arches with different intervals, and the application of the steel bar or the steel plate is limited. CONTENT OF THE INVENTION

[0005] In order to overcome the above problems, the application provides a steel arch with telescopic longitudinal connection.

[0006] The steel arch with telescopic longitudinal connection provided by the application adopts the following technical scheme:

[0007] The steel arch with telescopic longitudinal connection comprises two steel arches and a plurality of longitudinal connection devices, the plurality of longitudinal connection devices are located between the two steel arches, the plurality of longitudinal connection devices are distributed along the arc direction of the steel arch, and the two steel arches are distributed along the radial direction of the tunnel.

[0008] The longitudinal connecting device comprises a telescopic assembly and two plug-in assemblies, the telescopic assembly comprises a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are coaxially arranged, one end of the first connecting rod is hollow, one end of the second connecting rod is plugged into the first connecting rod, the second connecting rod is slidingly connected to the first connecting rod, the second connecting rod reciprocally slides along the length direction of the first connecting rod, the first connecting rod and the second connecting rod form a longitudinal connecting rod, and the two plug-in assemblies are respectively connected to one end of the longitudinal connecting rod, and the plug-in assemblies are connected with the steel arch.

[0009] By adopting the above technical scheme, when it is needed to connect two adjacent steel arches, first, the two adjacent steel arches are installed at a suitable position of the tunnel, then, a person takes out the telescopic assembly, adjusts the position of the second connecting rod until the longitudinal connecting rod is adjusted to a suitable position by the person observing the distance between the two steel arches, and then the plug-in assembly is connected with the steel arch. The steel arch with telescopic longitudinal connection can realize the following effects: through the sliding connection of the first connecting rod and the second connecting rod, the length of the longitudinal connecting device can be flexibly adjusted, so as to adapt to steel arches with different distances, improve the application range, and enhance the rigidity and stability of the overall structure; without welding on-site a steel bar or a steel plate with a fixed length, the workload is reduced, the construction efficiency and quality are improved, and the safety risk of construction in an explosive environment is reduced; the position of the second connecting rod can be easily adjusted, so that the longitudinal connecting device can accurately match the actual demand, and the flexibility and convenience of use are further improved.

[0010] In one specific implementation scheme, the telescopic assembly further comprises a telescopic piece, the telescopic piece comprises a rack, a gear and a rotating rod, the rack is connected to one end of the second connecting rod located in the first connecting rod, the setting direction of the rack is consistent with the length direction of the second connecting rod, the second connecting rod is provided with an embedding groove on one side for embedding the rack, the first connecting rod is provided with a through groove on the side close to the rack, the gear is inserted into the through groove on one side and engaged with the rack, the first connecting rod is connected with a connecting seat close to the through groove, the rotating rod is arranged perpendicularly to the first connecting rod, one end of the rotating rod is inserted into the connecting seat and fixed coaxially with the gear, and the rotating rod is rotationally connected to the connecting seat.

[0011] By adopting the above technical scheme, the telescopic assembly can realize accurate adjustment of the second connecting rod relative to the first connecting rod. Specifically, the cooperation of the rack and the pinion enables the rotating rotating rod to drive the rack to move, thereby pushing the second connecting rod to slide along the length direction of the first connecting rod, so as to realize flexible adjustment of the length of the longitudinal connecting rod. This design not only improves the connection precision between the steel arches, but also enhances the ability to adapt to different spacing requirements, avoiding the problem that the traditional fixed-length connecting piece cannot be installed under certain conditions. At the same time, this adjustable design reduces the workload of on-site welding, improves the construction quality and efficiency.

[0012] In a specific implementable scheme, the telescopic assembly further comprises a fixing member, which is a fixing screw. The first connecting rod is provided with a fixing hole near one end of the second connecting rod. The second connecting rod is provided with a plurality of connecting holes near one end of the first connecting rod. The connecting holes are distributed along the length direction of the second connecting rod. When the second connecting rod moves to a suitable position, the fixing hole corresponds to the connecting hole. The fixing screw is sequentially arranged in the fixing hole and the connecting hole. The fixing screw is sequentially threadedly connected to the first connecting rod and the second connecting rod. The fixing screw fixes the first connecting rod and the second connecting rod.

[0013] By adopting the above technical scheme, the fixing screw can fix the second connecting rod with the first connecting rod after the second connecting rod is adjusted to a suitable position, ensuring the relative position of the two during the tunnel construction process, thereby improving the overall rigidity and stability of the steel arch. At the same time, the multi-position adjustable connecting hole design enables the longitudinal connecting device to adapt to steel arches with different spacing, improving its application range and flexibility.

[0014] In one specific implementation, the plug-in assembly includes a rotating member and a plug-in member, the rotating member includes a first rotating plate, a second rotating plate and an elastic rod, the first rotating plate and the second rotating plate are located at one end of the second connecting rod away from the first connecting rod, the first rotating plate and the second rotating plate are arranged perpendicular to the second connecting rod, the first rotating plate and the second rotating plate are arranged along the length direction of the second connecting rod, the first rotating plate is fixed to the second connecting rod, the first rotating plate is provided with a receiving groove on the side away from the second connecting rod for accommodating the second rotating plate, the second rotating plate is rotatably connected to the first rotating plate, the side wall of the second rotating plate is fitted with the groove wall of the receiving groove, a plurality of insertion holes are arranged on the side wall of the second rotating plate along the circumferential direction, an insertion hole is arranged on the side wall of the first rotating plate, when the second rotating plate is rotated to a suitable position, the insertion hole corresponds to one of the insertion holes, the elastic rod is sequentially arranged in the insertion hole and the insertion hole, the elastic rod is sequentially and elastically connected to the first rotating plate and the second rotating plate, the elastic rod fixes the first rotating plate and the second rotating plate, the plug-in member is connected to the side of the second rotating plate away from the first rotating plate, and the plug-in member is connected to the steel arch.

[0015] By adopting the above technical scheme, the plug-in assembly can flexibly adjust the angle to adapt to the steel arch at different positions. Specifically, the first rotating plate and the second rotating plate of the rotating member can be relatively rotated, so that the plug-in member can freely adjust the direction within a certain range, thereby better matching the different positions of the steel arch; the use of the elastic rod ensures that the first rotating plate and the second rotating plate can be firmly fixed after being adjusted to a suitable position, avoiding loosening or falling off; the effective connection of the plug-in member and the steel arch enhances the stability of the overall structure, and improves the safety and reliability of the tunnel support.

[0016] In one specific implementation, the plug-in member includes a fixed plate, a baffle and a plurality of second springs, the fixed plate is fixed to the second rotating plate, the baffle is slidably connected to the second rotating plate, the fixed plate and the baffle are located on opposite sides of the second rotating plate, the baffle moves towards or away from the fixed plate, the baffle is fitted with the top chord of the steel arch, the fixed plate is fitted with the bottom chord of the steel arch, a plurality of second springs are located between the baffle and the fixed plate, a plurality of second springs are arranged in parallel with each other, one end of the second spring is fixed to the baffle, and the other end is fixed to the fixed plate.

[0017] By adopting the technical scheme, the position of the fixing plate and the baffle plate can be flexibly adjusted, the fixing plate and the baffle plate can be tightly attached to the top chord and the bottom chord of the steel arch, and the stability of the connection between the plug-in part and the steel arch is improved. Meanwhile, the arrangement of the plurality of second springs not only enhances the stability of the connection between the plug-in part and the steel arch, but also absorbs vibration and impact to some extent, thereby prolonging the service life.

[0018] In a specific implementation, the longitudinal connection device further comprises two connecting assemblies, one of which corresponds to one of the plug-in parts. Each connecting assembly comprises two connecting pieces, which correspond to the top chord and the bottom chord of the steel arch respectively. Each connecting piece comprises two L-shaped plates, one end of each of which is fixed to the top chord of the steel arch, and the openings of the two L-shaped plates face each other. A gap is formed between the two L-shaped plates for accommodating the fixing plate or the baffle plate. The two L-shaped plates fix the fixing plate or the baffle plate. The two L-shaped plates in the other connecting piece are connected to the bottom chord of the steel arch in the same way as the two L-shaped plates are connected to the top chord of the steel arch.

[0019] By adopting the technical scheme, the connecting assembly can effectively improve the stability of the connection between the plug-in part and the steel arch. Specifically, the two connecting pieces are fixed to the top chord and the bottom chord of the steel arch respectively, and a gap is formed between the two L-shaped plates for accommodating the fixing plate or the baffle plate. Therefore, the plug-in part can be firmly embedded in the steel arch, thereby ensuring that the longitudinal connection device can be reliably connected between steel arches with different spacings. This design not only improves the convenience of installation, but also enhances the stability and reliability of the overall structure.

[0020] In a specific implementation, the connecting assembly further comprises a reinforcing member. The reinforcing member comprises a rotating cylinder and two threaded rods. The rotating cylinder is located between the two connecting pieces, and the axis of the rotating cylinder is perpendicular to the L-shaped plates. Each of the two threaded rods is located at one end of the rotating cylinder, and one end of each threaded rod is inserted into the rotating cylinder, and the other end of each threaded rod is inserted into the L-shaped plate and abuts against the fixing plate or the baffle plate. The threaded rods are threadedly connected to the rotating cylinder and the L-shaped plates.

[0021] By adopting the technical scheme, the reinforcing member in the connecting assembly can significantly improve the connection strength and stability between the plug-in part and the steel arch. Specifically, the combination of the rotating cylinder and the two threaded rods enables the fixing plate and the baffle plate to be firmly fixed in the gap formed by the L-shaped plates, thereby ensuring the reliability and safety of the longitudinal connection device during tunnel construction. In addition, this design allows for quick adjustment and installation on site, improves construction efficiency, and reduces safety hazards caused by welding.

[0022] In one specific implementation, the telescopic component further comprises a handle connected to the rotating rod at an end away from the gear.

[0023] By adopting the above technical solution, the handle is provided to make it more convenient for the operator to rotate the rotating rod, thereby achieving accurate adjustment of the position of the second connecting rod. Specifically, the handle provides a better gripping point, reduces the force required for manual adjustment, and improves work efficiency and accuracy.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The steel arch with telescopic longitudinal connection is designed, and the length of the longitudinal connection device can be flexibly adjusted through the sliding connection of the first connecting rod and the second connecting rod, so as to adapt to steel arches of different spacings, improve the application range, and enhance the rigidity and stability of the overall structure; without welding on-site to fix the length of the steel bar or steel plate, the workload is reduced, the construction efficiency and quality are improved, and the safety risk of construction in an explosive environment is reduced; the position of the second connecting rod can be easily adjusted, so that the longitudinal connection device can accurately match the actual demand, and the flexibility and convenience of use are further improved.

[0026] 2. The steel arch with telescopic longitudinal connection is designed, and the telescopic component can achieve accurate adjustment of the second connecting rod relative to the first connecting rod. Specifically, the cooperation of the rack and the gear makes the rotating rod drive the rack to move, thereby pushing the second connecting rod to slide along the length direction of the first connecting rod, so as to realize flexible adjustment of the length of the longitudinal connecting rod. This design not only improves the connection accuracy between steel arches, but also enhances the ability to adapt to different spacing requirements, avoiding the problem that traditional fixed-length connecting pieces cannot be installed under certain conditions. At the same time, this adjustable design reduces the workload of on-site welding, improves construction quality and efficiency.

[0027] 3. The steel arch with telescopic longitudinal connection is designed, and the reinforcing member in the connecting component can significantly improve the connection strength and stability between the plug-in piece and the steel arch. Specifically, the combination of the rotating cylinder and the two threaded rods makes the fixing plate and the baffle plate be firmly fixed in the gap formed by the L-shaped plate, thereby ensuring the reliability and safety of the longitudinal connection device during tunnel construction. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0029] Figure 2 is Figure 1 is an enlarged view of A in

[0030] Figure 3 is a structural schematic diagram of the plug-in assembly in the embodiment.

[0031] Figure 4 is a schematic view of the plug-in assembly in the embodiment.

[0032] Figure 5 is a structural schematic view of the connecting assembly in the embodiment.

[0033] Reference signs: 1, steel arch; 2, telescopic assembly; 21, first connecting rod; 211, through slot; 212, connecting seat; 213, fixing hole; 22, second connecting rod; 221, embedding slot; 222, connecting hole; 23, telescopic piece; 231, rack; 232, gear; 233, rotating rod; 234, handle; 24, fixing piece; 3, plug-in assembly; 31, rotating piece; 311, first rotating plate; 3111, accommodating slot; 3112, plug hole; 312, second rotating plate; 3121, insertion hole; 313, rotating rod; 314, torsional spring; 315, elastic rod; 32, plug-in piece; 321, fixing plate; 322, baffle; 323, second spring; 4, connecting assembly; 41, connecting piece; 411, L-shaped plate; 42, reinforcing piece; 421, rotating cylinder; 422, threaded rod. DETAILED DESCRIPTION

[0034] The following will be described in detail in combination with the accompanying Figures 1-5 The application is further described in detail.

[0035] The embodiment of the application discloses a steel arch with telescopic longitudinal connection.

[0036] Reference Figure 1 The steel arch with telescopic longitudinal connection comprises two steel arches 1 and a plurality of longitudinal connection devices, the plurality of longitudinal connection devices are located between the two steel arches 1, and the plurality of longitudinal connection devices are distributed along the arc direction of the steel arch 1, the longitudinal connection device comprises a telescopic assembly 2, two plug-in assemblies 3 and two connecting assemblies 4, and the plug-in assembly 3 and the connecting assembly 4 are arranged on the telescopic assembly 2.

[0037] Reference Figure 1 and Figure 2, the steel arch 1 can support the inner wall of the tunnel, the two steel arches 1 are distributed along the radial direction of the tunnel, the telescopic assembly 2 comprises a first connecting rod 21, a second connecting rod 22, a telescopic piece 23 and a fixing piece 24, in the embodiment, the first connecting rod 21 and the second connecting rod 22 are both rectangular rods, the first connecting rod 21 and the second connecting rod 22 are both located between the two steel arches 1, and the first connecting rod 21 and the second connecting rod 22 are coaxially arranged, one end of the first connecting rod 21 is hollow, one end of the second connecting rod 22 close to the first connecting rod 21 is hollow, the second connecting rod 22 is inserted into the first connecting rod 21, the second connecting rod 22 is slidably connected to the first connecting rod 21, and the second connecting rod 22 reciprocally slides along the length direction of the first connecting rod 21; the telescopic piece 23 is located inside the hollow end of the first connecting rod 21, the telescopic piece 23 comprises a rack 231, a gear 232, a rotating rod 233 and a handle 234, the rack 231 is located at one end of the first connecting rod 21 close to the second connecting rod 22, and the arrangement direction of the rack 231 is consistent with the length direction of the second connecting rod 22, one side of the second connecting rod 22 is provided with an embedding groove 221 for embedding the rack 231, the rack 231 is welded to the second connecting rod 22, one side of the first connecting rod 21 close to the rack 231 is provided with a through groove 211, one side of the gear 232 extends into the through groove 211 and is engaged with the rack 231, the first connecting rod 21 is provided with a connecting seat 212 at the through groove 211, the connecting seat 212 is welded to the first connecting rod 21, the rotating rod 233 is perpendicular to the first connecting rod 21, one end of the rotating rod 233 is coaxially welded with the gear 232 after penetrating through the connecting seat 212, the rotating rod 233 is rotationally connected to the connecting seat 212, the handle 234 is located at one end of the rotating rod 233 away from the gear 232, the handle 234 is welded to the rotating rod 233, and the rotating rod 233 is self-locked through a ratchet mechanism, if it is necessary to adjust the position of the second connecting rod 22, a person rotates the handle 234, the handle 234 drives the rotating rod 233 to rotate, at this time, the rotating rod 233 drives the gear 232 to rotate, the gear 232 drives the rack 231 to move, and the second connecting rod 22 can slide along the length direction of the first connecting rod 21.

[0038] With reference to Figure 1 and Figure 2 , the fixing piece 24 is a fixing screw, one end of the first connecting rod 21 close to the second connecting rod 22 is provided with a fixing hole 213, one end of the second connecting rod 22 close to the first connecting rod 21 is provided with a plurality of connecting holes 222, the plurality of connecting holes 222 are distributed along the length direction of the second connecting rod 22, when the second connecting rod 22 moves to a suitable position, the fixing hole 213 corresponds to the connecting hole 222, the fixing screw is sequentially penetrated into the fixing hole 213 and the connecting hole 222, the fixing screw is sequentially threadedly connected to the first connecting rod 21 and the second connecting rod 22, and the fixing screw can fix the first connecting rod 21 and the second connecting rod 22, so as to enhance the connection stability of the first connecting rod 21 and the second connecting rod 22.

[0039] With reference to Figure 1 , Figure 3 and Figure 4 , the first connecting rod 21 and the second connecting rod 22 form a longitudinal connecting rod, and the two plug-in assemblies 3 are respectively located at one end of the longitudinal connecting rod, the plug-in assembly 3 comprises a rotating piece 31 and a plug-in piece 32, the rotating piece 31 comprises a first rotating plate 311, a second rotating plate 312, a rotating rod 313, a torsional spring 314, an elastic rod 315 and a first spring, the first rotating plate 311 and the second rotating plate 312 are both located at an end of the second connecting rod 22 away from the first connecting rod 21, the first rotating plate 311 and the second rotating plate 312 are both arranged perpendicularly to the second connecting rod 22, and the first rotating plate 311 and the second rotating plate 312 are arranged in parallel, the first rotating plate 311 is arranged along the length direction of the second connecting rod 22, the first rotating plate 311 is close to the second connecting rod 22 and is welded to the second connecting rod 22, a containing groove 3111 for containing the second rotating plate 312 is formed on the side of the first rotating plate 311 away from the second connecting rod 22, the second rotating plate 312 is rotationally connected to the first rotating plate 311, the rotation axis of the second rotating plate 312 coincides with the axis of the second connecting rod 22, the side wall of the second rotating plate 312 is attached to the groove wall of the containing groove 3111, the rotating rod 313 is located between the first rotating plate 311 and the second rotating plate 312, the rotating rod 313 is arranged on the side of the first rotating plate 311 to the second rotating plate 312, one end of the rotating rod 313 is welded to the first rotating plate 311, the second rotating plate 312 is rotationally connected to the other end of the rotating rod 313, the axis of the rotating rod 313 coincides with the axis of the second connecting rod 22, the torsional spring 314 is sleeved on the outer wall of the rotating rod 313, one end of the torsional spring 314 is welded to the rotating rod 313, and the other end of the torsional spring 314 is welded to the second rotating plate 312.

[0040] With reference to Figure 1 , Figure 3 and Figure 4The side wall of the second rotating plate 312 is provided with a plurality of insertion holes 3121 which are uniformly distributed along the circumference of the second rotating plate 312. The side wall of the first rotating plate 311 is provided with an insertion hole 3112. When the second rotating plate 312 is rotated to a suitable position, the insertion hole 3112 corresponds to one of the insertion holes 3121. The elastic rod 315 is sequentially arranged in the insertion hole 3112 and the insertion hole 3121. The elastic rod 315 is sequentially and elastically connected to the first rotating plate 311 and the second rotating plate 312. The elastic rod 315 can fix the first rotating plate 311 and the second rotating plate 312. In the embodiment, the end of the elastic rod 315 away from the second rotating plate 312 is provided with a first spring. One end of the first spring is welded to the first rotating plate 311, and the other end is welded to the elastic rod 315. In the embodiment, the first spring is a compression spring. When the second rotating plate 312 is rotated to a suitable position, the elastic rod 315 can be sequentially arranged in the insertion hole 3112 and the insertion hole 3121. At this time, the elastic rod 315 fixes the second rotating plate 312 and the first rotating plate 311. When it is necessary to adjust the position of the second rotating plate 312, the personnel pulls the elastic rod 315, and the elastic rod 315 is separated from the second rotating plate 312. The first spring is elongated. At this time, the position of the second rotating plate 312 can be adjusted.

[0041] With reference to Figure 1 , Figure 3 and Figure 4 , the plug-in part 32 is located on the side of the second rotating plate 312 away from the first rotating plate 311. The plug-in part 32 includes a fixed plate 321, a baffle 322 and a plurality of second springs 323. The fixed plate 321 is welded to the second rotating plate 312. The baffle 322 is slidably connected to the second rotating plate 312. The fixed plate 321 and the baffle 322 are located on the two sides opposite to each other of the second rotating plate 312. The baffle 322 can move towards or away from the side of the fixed plate 321. The baffle 322 is attached to the inner wall of the steel arch 1. The fixed plate 321 is attached to the lower inner wall of the steel arch 1, which facilitates to enhance the stability of the connection between the baffle 322 and the fixed plate 321 and the steel arch 1. The plurality of second springs 323 are located between the baffle 322 and the fixed plate 321. The plurality of second springs 323 are arranged in parallel with each other. One end of the second spring 323 is welded to the baffle 322, and the other end is welded to the fixed plate 321. In the embodiment, the second spring 323 is a compression spring.

[0042] With reference to Figure 4 and Figure 5In the embodiment, the fixing plate 321 and the baffle 322 can be connected with the steel arch 1 by welding, or the fixing plate 321 and the baffle 322 can be connected with the steel arch 1 by the connecting assembly 4. One connecting assembly 4 corresponds to one plug-in piece 32. The connecting assembly 4 includes two connecting pieces 41 and two reinforcing pieces 42. The connecting piece 41 corresponds to the upper chord and the lower chord of the steel arch 1 respectively. The connecting piece 41 includes two L-shaped plates 411. One end of each of the two L-shaped plates 411 is welded to the upper chord of the steel arch 1. The openings of the two L-shaped plates 411 face each other. A gap for accommodating the fixing plate 321 or the baffle 322 is left between the two L-shaped plates 411. The two L-shaped plates 411 fix the fixing plate 321 or the baffle 322. The two L-shaped plates 411 in the other connecting piece 41 are connected with the lower chord of the steel arch 1 in the same way as the above-mentioned L-shaped plates 411 are connected with the upper chord of the steel arch 1. The two reinforcing pieces 42 are arranged along a direction perpendicular to the distribution direction of the fixing plate 321 and the baffle 322. The reinforcing piece 42 includes a rotating cylinder 421 and two threaded rods 422. The rotating cylinder 421 is located between the two connecting pieces 41. The axis of the rotating cylinder 421 is perpendicular to the L-shaped plate 411. The two threaded rods 422 are respectively located at one end of the rotating cylinder 421. One end of the threaded rod 422 is inserted into the rotating cylinder 421, and the other end is arranged through the L-shaped plate 411 and abuts against the fixing plate 321 or the baffle 322. The threaded rod 422 is screw-connected with the rotating cylinder 421 and the L-shaped plate 411. When the fixing plate 321 and the baffle 322 are located in the gap between the two L-shaped plates 411 in the two connecting pieces 41, a worker can make the length of the reinforcing piece 42 elongate by rotating the rotating cylinder 421, so that the two threaded rods 422 abut against the fixing plate 321 and the baffle 322, thereby connecting the plug-in piece 32 and the steel arch 1.

[0043] The implementation principle of the steel arch with the telescopic longitudinal connection in the embodiment is as follows: when it is necessary to connect two adjacent steel arches 1, the connecting assembly 4 in the longitudinal connection device is connected with the steel arch 1 at a specified position in advance in a factory. First, the two adjacent steel arches 1 are installed at appropriate positions of a tunnel. Then, a worker takes out the longitudinal connection device, and the multiple longitudinal connection devices are distributed along the arc direction of the steel arch 1 at intervals, so that the longitudinal connection device is connected with the steel arch 1.

[0044] When the longitudinal connection device needs to be connected with the steel arch 1, according to the interval between two adjacent steel arches 1, the personnel rotates the rotating rod 233 to adjust the position of the second connecting rod 22, and through observation, the second connecting rod 22 is adjusted to the appropriate position, then the personnel rotates the second rotating plate 312, at this time, the plug-in part 32 rotates with the second rotating plate 312, through observation, the plug-in part 32 is inserted into the corresponding connecting assembly 4, so that the fixing plate 321 and the baffle 322 are inserted into the gap formed by the two L-shaped plates 411, then the reinforcing part 42 is started, and the reinforcing part 42 fixes the fixing plate 321 and the baffle 322 with the L-shaped plate 411; according to the above steps, the plug-in part 32 at the other end of the longitudinal connecting rod is connected with the connecting assembly 4.

[0045] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A steel arch with telescopic longitudinal links, characterized in that: The tunnel steel arch support structure comprises two steel arch supports (1) and a plurality of longitudinal connection devices, the plurality of longitudinal connection devices are arranged between the two steel arch supports (1) and are distributed along the arc direction of the steel arch supports (1), and the two steel arch supports (1) are distributed along the radial direction of the tunnel. The longitudinal connection device comprises a telescopic assembly (2) and two plug-in assemblies (3), the telescopic assembly (2) comprises a first connecting rod (21) and a second connecting rod (22), the first connecting rod (21) and the second connecting rod (22) are coaxially arranged, one end of the first connecting rod (21) is hollow, one end of the second connecting rod (22) is plugged into the first connecting rod (21), the second connecting rod (22) is slidingly connected to the first connecting rod (21), the second connecting rod (22) reciprocally slides along the length direction of the first connecting rod (21), the first connecting rod (21) and the second connecting rod (22) form a longitudinal connecting rod, and the two plug-in assemblies (3) are respectively connected to one end of the longitudinal connecting rod, and the plug-in assembly (3) is connected with the steel arch support (1).

2. A steel arch with telescopic longitudinal links according to claim 1, characterized in that: The telescopic assembly (2) further comprises a telescopic piece (23), the telescopic piece (23) comprises a rack (231), a gear (232) and a rotating rod (233), one end of the rack (231) is connected to the second connecting rod (22) located in the first connecting rod (21), the setting direction of the rack (231) is consistent with the length direction of the second connecting rod (22), one side of the second connecting rod (22) is provided with an embedding groove (221) for embedding the rack (231), the first connecting rod (21) is provided with a through groove (211) near one side of the rack (231), one side of the gear (232) extends into the through groove (211) and is engaged with the rack (231), the first connecting rod (21) is connected with a connecting seat (212) near the through groove (211), the rotating rod (233) is arranged perpendicularly to the first connecting rod (21), one end of the rotating rod (233) penetrates through the connecting seat (212) and is coaxially fixed with the gear (232), and the rotating rod (233) is rotationally connected to the connecting seat (212).

3. A steel arch with telescopic longitudinal links according to claim 2, characterized in that: The telescopic assembly (2) further comprises a fixing member (24), which is a fixing screw; the first connecting rod (21) is provided with a fixing hole (213) near one end of the second connecting rod (22); the second connecting rod (22) is provided with a plurality of connecting holes (222) near one end of the first connecting rod (21); the connecting holes (222) are distributed along the length direction of the second connecting rod (22) at intervals; when the second connecting rod (22) moves to a suitable position, the fixing hole (213) corresponds to the connecting hole (222); the fixing screw is sequentially arranged in the fixing hole (213) and the connecting hole (222); the fixing screw is sequentially threadedly connected to the first connecting rod (21) and the second connecting rod (22); and the fixing screw fixes the first connecting rod (21) and the second connecting rod (22).

4. The steel arch with telescopic longitudinal links according to claim 2, characterized in that: The plug-in assembly (3) comprises a rotating member (31) and a plug-in member (32); the rotating member (31) comprises a first rotating plate (311), a second rotating plate (312) and an elastic rod (315); the first rotating plate (311) and the second rotating plate (312) are located at one end of the second connecting rod (22) away from the first connecting rod (21); the first rotating plate (311) and the second rotating plate (312) are arranged perpendicularly to the second connecting rod (22); the first rotating plate (311) and the second rotating plate (312) are arranged along the length direction of the second connecting rod (22); the first rotating plate (311) is fixed to the second connecting rod (22); the first rotating plate (311) is provided with an accommodating groove (3111) on the side away from the second connecting rod (22) and used for accommodating the second rotating plate (312); the second rotating plate (312) is rotatably connected to the first rotating plate (311); the side wall of the second rotating plate (312) is attached to the groove wall of the accommodating groove (3111); a plurality of insertion holes (3121) are formed in the side wall of the second rotating plate (312) along the circumferential direction; an insertion hole (3112) is formed in the side wall of the first rotating plate (311); when the second rotating plate (312) rotates to a suitable position, the insertion hole (3112) corresponds to one of the insertion holes (3121); the elastic rod (315) is sequentially arranged in the insertion hole (3112) and the insertion hole (3121); the elastic rod (315) is sequentially elastically and slidably connected to the first rotating plate (311) and the second rotating plate (312); the elastic rod (315) fixes the first rotating plate (311) and the second rotating plate (312); the plug-in member (32) is connected to the side of the second rotating plate (312) away from the first rotating plate (311); and the plug-in member (32) is connected to the steel arch (1).

5. A steel arch with telescopic length according to claim 4, characterized in that: The plug-in part (32) comprises a fixed plate (321), a baffle (322) and a plurality of second springs (323), the fixed plate (321) is fixed to the second rotating plate (312), the baffle (322) is slidingly connected to the second rotating plate (312), the fixed plate (321) and the baffle (322) are located on the two sides opposite to the second rotating plate (312) respectively, the baffle (322) moves towards or away from the side of the fixed plate (321), the baffle (322) is in close contact with the top chord of the steel arch (1), the fixed plate (321) is in close contact with the bottom chord of the steel arch (1), a plurality of the second springs (323) are located between the baffle (322) and the fixed plate (321), a plurality of the second springs (323) are arranged in parallel, one end of the second spring (323) is fixed to the baffle (322), and the other end is fixed to the fixed plate (321).

6. A steel arch with telescopic length according to claim 5, characterized in that: The longitudinal device further comprises two connecting assemblies (4), one of the connecting assemblies (4) corresponds to one of the plug-in parts (32), the connecting assembly (4) comprises two connecting pieces (41), the two connecting pieces (41) correspond to the top chord and the bottom chord of the steel arch (1) respectively, the connecting piece (41) comprises two L-shaped plates (411), one end of the two L-shaped plates (411) is fixed to the top chord of the steel arch (1), the openings of the two L-shaped plates (411) face each other, a gap is left between the two L-shaped plates (411) for accommodating the fixed plate (321) or the baffle (322), the two L-shaped plates (411) fix the fixed plate (321) or the baffle (322), the connection mode of the two L-shaped plates (411) in the other connecting piece (41) and the bottom chord of the steel arch (1) is the same as the connection mode of the above-mentioned L-shaped plate (411) and the top chord of the steel arch (1).

7. A steel arch with telescopic length according to claim 6, characterized in that: The connecting assembly (4) further comprises a reinforcing part (42), the reinforcing part (42) comprises a rotating cylinder (421) and two threaded rods (422), the rotating cylinder (421) is located between the two connecting pieces (41), the axis of the rotating cylinder (421) is perpendicular to the L-shaped plate (411), the two threaded rods (422) are located at one end of the rotating cylinder (421) respectively, one end of the threaded rod (422) is plugged into the rotating cylinder (421), the other end penetrates through the L-shaped plate (411) and abuts against the fixed plate (321) or the baffle (322), the threaded rod (422) is threadedly connected to the rotating cylinder (421) and the L-shaped plate (411).

8. The steel arch with telescopic longitudinal links according to claim 2, characterized in that: The telescopic part (23) further comprises a handle (234), the handle (234) is connected to the end of the rotating rod (233) away from the gear (232).

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