Large-span beret piece

Abstract

According to the large-span beret piece, in the using process of a structure reinforcing mechanism, the size of a rhombic frame composed of two first hinge bases, two second hinge bases and four reinforcing pipes can be adjusted, and in the process that the two second hinge bases are close to each other, the two first hinge bases can be driven to be away from each other, so that the two second hinge bases can be driven to be away from each other; therefore, the embedded blocks on the two first hinge seats are embedded into the embedded seats of the upper chord member and the lower chord member for connection; the second hinge seat is telescopically arranged on the adjusting pipe and is matched with the limiting assembly to limit the second hinge seat to move towards the adjacent vertical pipe, so that the second hinge seat is fixedly connected with the vertical pipe; in the process, the two first hinge seats can be adjusted in the longitudinal direction, the two second hinge seats and the adjusting pipe can be adjusted in the transverse direction, and the beret pieces of different models can be installed so that the structural strength of the beret pieces can be improved, and the beret pieces can be used for a large-span bridge.

Description

Technical Field

[0001] The utility model relates to a large-span Bailey truss Background Art

[0002] Bailey trusses are mostly used for the erection of temporary steel trestle bridges during bridge construction. The main disadvantages of existing Bailey trusses are as follows: they are not suitable for large spans. Existing Bailey bridges are suitable for small bridges. When the span is large, obvious bending and vibration will occur, which will affect the stability and safety of the bridge. They are not suitable for vehicles with high loads. The structure limits the load-bearing capacity of the Bailey bridge. Vehicles with a large mass or high load may overload the bridge, resulting in damage or collapse of the bridge.

[0003] For example, the patent with the authorization announcement number CN 220767683 U and the authorization announcement date of April 12, 2024 discloses "Bailey Truss Structure and Bailey Bridge". By setting a structural strengthening mechanism between the truss beam components, the structural strength is increased to adapt to the use of large-span bridges. The truss beam components and the first strengthening member of the structural strengthening mechanism form a square frame.

[0004] However, in the actual production process, the sizes of the square frames composed of the truss beam components and the first strengthening components of different models of Bailey trusses are different, and the second strengthening member is not suitable for strengthening the structures of different models of Bailey trusses. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a large-span Bailey truss, whose structural strengthening mechanism can be adapted to different models of Bailey trusses for installation, so as to improve the structural strength of the Bailey truss and adapt to the use of large-span bridges.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions: a large-span Bailey plate, comprising an upper chord, a lower chord parallel to the upper chord, a plurality of vertical tubes arranged between the upper chord and the lower chord, and a structural reinforcement mechanism, wherein the structural reinforcement mechanism is arranged between any two adjacent vertical tubes, the upper chord, and the lower chord, and the structural reinforcement mechanism comprises two first hinged seats symmetrically distributed up and down, two second hinged seats symmetrically distributed left and right, four reinforcement tubes respectively hingedly arranged between adjacent first hinged seats and second hinged seats, two adjustment tubes with one end mounted on the vertical tube and the other end passing through the second hinged seat, and a limit assembly arranged between the adjustment tube and the second hinged seat and limiting the movement of the second hinged seat toward the adjacent vertical tube; Embedded seats are symmetrically arranged in the middle of the upper chord rod and the lower chord rod, and embedded blocks for being embedded in the two embedded seats are respectively arranged on the end surfaces of the two first hinged seats that are away from each other; the installation process of the structural reinforcement mechanism includes the following steps: (S1) passing the two adjustment tubes through the second hinged seats, and installing one end of the adjustment tube on the vertical pipe; (S2) pulling the two second hinged seats away from each other so that the distance between the two first hinged seats is smaller than the distance between the upper chord rod and the lower chord rod; (S3) pushing the two second hinged seats towards each other so that the embedded blocks of the two first hinged seats are embedded in the two embedded seats; (S4) limiting the movement of the second hinged seat toward the adjacent vertical pipe by the limit assembly to prevent the embedded block from detaching from the embedded seat.

[0007] By adopting the above technical scheme, during the use of the structural reinforcement mechanism, the diamond frame composed of two first articulated seats, two second articulated seats and four reinforcement tubes can be adjusted in size. In the process of making the two second articulated seats approach each other, the two first articulated seats can be driven away from each other, so that the embedded blocks on the two first articulated seats are embedded in the embedded seats of the upper chord and the lower chord for connection; and because the second articulated seat is telescopically arranged on the adjustment tube, the limiting assembly is cooperated to limit the movement of the second articulated seat toward the adjacent vertical pipe, so as to achieve connection and fixation with the vertical pipe; in this process, the two first articulated seats can be adjusted longitudinally, and the two second articulated seats and the adjustment tube can be adjusted transversely, and can be adapted to different types of Bailey plates for installation, so as to improve the structural strength of the Bailey plates and adapt to the use of large-span bridges.

[0008] The further setting of the present utility model is as follows: strip-shaped holes are arranged on the front and rear end faces of the adjusting pipe. The limiting assembly includes a connecting sleeve arranged on the second hinge seat and sleeved on the adjusting pipe, two support plates located inside the adjusting pipe, a plurality of limiting pieces arranged on the support plates and telescopically arranged in the strip-shaped holes, an adjusting screw rod slidably connected to the end of the adjusting pipe far from the vertical pipe, and a linkage structure arranged between the adjusting screw rod and the two support plates and driving the limiting pieces to protrude from the strip-shaped holes when the adjusting screw rod rotates towards the direction close to the vertical pipe; limiting grooves for several limiting pieces to be embedded are arranged in the connecting sleeve.

[0009] By adopting the above technical solution, when the adjusting screw rod rotates towards the direction close to the vertical pipe, the limiting pieces on the support plates are driven by the linkage structure to protrude from the strip-shaped holes and then embedded in the limiting grooves of the connecting sleeve, so as to realize the limiting and fixing of the second hinge seat, and prevent the diamond-shaped frame composed of two first hinge seats, two second hinge seats and four reinforcing pipes from moving.

[0010] The further setting of the present utility model is as follows: the linkage structure includes two first wedge-shaped blocks symmetrically arranged on the end faces of the support plates close to each other, a telescopic block telescopically arranged in the adjusting pipe, and a second wedge-shaped block arranged on the telescopic block and abutted against the two first wedge-shaped blocks. During the process that the adjusting screw rod drives the telescopic block to move towards the vertical pipe, the second wedge-shaped block drives the two first wedge-shaped blocks to move away from each other, so that the limiting pieces protrude from the strip-shaped holes and then are embedded in the limiting grooves of the connecting sleeve.

[0011] By adopting the above technical solution, when the linkage structure is used, during the process that the adjusting screw rod drives the telescopic block to move towards the vertical pipe, the second wedge-shaped block drives the two first wedge-shaped blocks to move away from each other, so that the limiting pieces protrude from the strip-shaped holes and then are embedded in the limiting grooves of the connecting sleeve.

[0012] The further setting of the present utility model is as follows: a rubber gasket for the limiting pieces to pass through is arranged on the support plate, and the rubber gasket is abutted between the support plate and the inner wall of the adjusting pipe.

[0013] By adopting the above technical solution, by arranging the rubber gasket, the rubber gasket is abutted between the support plate and the inner wall of the adjusting pipe, so as to realize the sealing of the connection part between the adjusting pipe and the plurality of limiting pieces.

[0014] The further setting of the present utility model is as follows: a plurality of connection holes arranged along the length direction are arranged on each side surface of the adjusting pipe. The limiting assembly includes a limiting sleeve sleeved on the adjusting pipe, a rubber shock-absorbing ring arranged on the end face of the limiting sleeve close to the second hinge seat and used for abutting against the end face of the second hinge seat close to the vertical pipe, and a plurality of limiting bolts threadedly connected to the limiting sleeve and used for being embedded in the connection holes.

[0015] By adopting the above technical solution, by moving the limiting sleeve towards the direction close to the second hinge seat, the deformation that occurs during the process of the rubber shock-absorbing ring pressing against the limiting sleeve and the second hinge seat is utilized to finely adjust the position of the limiting sleeve, so that the limiting bolt can be inserted into the connection hole to limit the second hinge seat from moving towards the direction close to the vertical pipe; meanwhile, the rubber shock-absorbing ring has a shock-absorbing and buffering effect.

[0016] A further setting of the present utility model is that a telescopic pipe fitting is sleeved between the two adjusting pipes. The telescopic pipe fitting includes a bidirectional threaded rod with opposite threaded ends at both ends, two threaded pipes respectively threadedly connected to the bidirectional threaded rod, and two sleeves respectively arranged on the threaded pipes and used for sleeving on the adjusting pipes. After the two sleeves move towards the direction away from each other, they are sleeved on the adjusting pipes and pressed against the second hinge seat.

[0017] By adopting the above technical solution, through the setting of the telescopic pipe fitting, the structures of the ends of the two adjusting pipes can be further strengthened, thereby further improving the overall structural strength of the Bailey truss.

[0018] A further setting of the present utility model is that a part of the embedding block embedded in the embedding seat is wrapped with a rubber shock-absorbing sleeve.

[0019] By adopting the above technical solution, by setting the rubber shock-absorbing sleeve, buffering is achieved at the joints between the embedding block and the upper chord, and between the embedding block and the lower chord.

[0020] A further setting of the present utility model is that first sliding grooves and second sliding grooves are respectively arranged on the end faces of the upper chord and the lower chord close to each other. Sliding blocks slidably connected in the first sliding groove and the second sliding groove are arranged at the upper and lower ends of the vertical pipe. Cushion plates abutting against the end faces of the upper chord or the lower chord are respectively arranged at the upper and lower ends of the vertical pipe. The cushion plates and the upper chord, and the cushion plates and the lower chord are respectively fixed by a plurality of fastening bolts.

[0021] By adopting the above technical solution, through the setting that the vertical pipe can slide on the upper chord and the lower chord, a plurality of vertical pipes and the upper chord and the lower chord can be first combined into a whole, preventing the joints at both ends of the vertical pipe from shifting during the process of being fixed by the fastening bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of Embodiment 1;

[0023] Figure 2 is an exploded view of a partial structure of Embodiment 1;

[0024] Figure 3 is a side view of Embodiment 1;

[0025] Figure 4 It is a partial structural schematic diagram of the structure strengthening mechanism in Embodiment 1;

[0026] Figure 5 is Figure 2 a partial enlarged view at position A in

[0027] Figure 6 It is a structural sectional view of the adjusting pipe and the limiting component in Embodiment 1;

[0028] Figure 7 It is a structural schematic diagram of the telescopic pipe fitting in Embodiment 1;

[0029] Figure 8 It is a structural schematic diagram of Embodiment 2;

[0030] Figure 9 is Figure 8 a partial enlarged view at position A in

[0031] Reference numerals: 1, upper chord; 11, first chute; 2, lower chord; 21, second chute; 3, vertical pipe; 31, sliding block; 32, backing plate; 4, structure strengthening mechanism; 41, first hinge seat; 411, embedding block; 412, rubber shock-absorbing sleeve; 42, second hinge seat; 43, strengthening pipe; 44, adjusting pipe; 441, strip hole; 442, connection hole; 45, limiting component; 451, connection sleeve; 452, support plate; 4521, rubber gasket; 453, limiting piece; 454, adjusting screw; 455, linkage structure; 4551, first wedge-shaped block; 4552, telescopic block; 4553, second wedge-shaped block; 46, limiting sleeve; 47, rubber shock-absorbing ring; 48, limiting bolt; 49, telescopic pipe fitting; 491, bidirectional threaded rod; 492, threaded pipe; 493, sleeve; 51, embedding seat; 52, fastening bolt. Specific embodiments

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1: A large-span Bailey truss, as Figures 1 to 3As shown, it includes an upper chord rod 1, a lower chord rod 2 parallel to the upper chord rod 1, a plurality of vertical pipes 3 arranged between the upper chord rod 1 and the lower chord rod 2, and a structural reinforcement mechanism 4, wherein the structural reinforcement mechanism 4 is arranged between any two adjacent vertical pipes 3, the upper chord rod 1, and the lower chord rod 2. The upper chord rod 1 and the lower chord rod 2 are respectively provided with a first slide groove 11 and a second slide groove 21 on the end surfaces close to each other, and the upper and lower ends of the vertical pipe 3 are provided with sliding blocks 31 slidably connected in the first slide groove 11 and the second slide groove 21, and the upper and lower ends of the vertical pipe 3 are respectively provided with pads 32 abutting against the end surfaces of the upper chord rod 1 or the lower chord rod 2, and the pads 32 and the upper chord rod 1, and the pads 32 and the lower chord rod 2 are respectively fixed by a plurality of fastening bolts 52.

[0034] like Figure 1 , Figure 2 and Figure 4 As shown, the structural reinforcement mechanism 4 includes two first hinge seats 41 symmetrically distributed up and down, two second hinge seats 42 symmetrically distributed left and right, four reinforcement tubes 43 respectively hingedly arranged between adjacent first hinge seats 41 and second hinge seats 42, two adjustment tubes 44 with one end mounted on the vertical tube 3 and the other end passing through the second hinge seat 42, and a limit assembly 45 arranged between the adjustment tube 44 and the second hinge seat 42 and limiting the second hinge seat 42 from moving toward the adjacent vertical tube 3; the middle part of the upper chord rod 1 and the lower chord rod 2 is symmetrically provided with an embedding seat 51, and the end surfaces of the two first hinge seats 41 that are away from each other are respectively provided with an embedding block 411 for embedding in the two embedding seats 51. The part of the embedding block 411 embedded in the embedding seat 51 is wrapped with a rubber shock-absorbing sleeve 412.

[0035] like Figure 1 and Figure 5 As shown, the installation process of the structural reinforcement mechanism 4 includes the following steps: (S1) passing the two adjustment tubes 44 through the second hinge seats 42, and installing one end of the adjustment tube 44 on the vertical pipe 3; (S2) pulling the two second hinge seats 42 away from each other so that the distance between the two first hinge seats 41 is smaller than the distance between the upper chord rod 1 and the lower chord rod 2; (S3) pushing the two second hinge seats 42 towards each other so that the embedding blocks 411 of the two first hinge seats 41 are embedded in the two embedding seats 51; (S4) limiting the movement of the second hinge seats 42 toward the adjacent vertical pipe 3 by the limit assembly 45 to prevent the embedding block 411 from detaching from the embedding seat 51.

[0036] like Figure 2 , Figure 4 and Figure 5As shown, strip-shaped holes 441 are arranged on the front and rear end faces of the adjusting pipe 44. The limiting assembly 45 includes a connecting sleeve 451 provided on the second hinge seat 42 and sleeved on the adjusting pipe 44, two support plates 452 located inside the adjusting pipe 44, a plurality of limiting pieces 453 provided on the support plates 452 and telescopically arranged in the strip-shaped holes 441, an adjusting screw 454 slidably connected to one end of the adjusting pipe 44 away from the vertical pipe 3, and a linkage structure 455 provided between the adjusting screw 454 and the two support plates 452 and driving the limiting pieces 453 to protrude from the strip-shaped holes 441 during the rotation of the adjusting screw 454 towards the direction close to the vertical pipe 3; limiting grooves for several limiting pieces 453 to be embedded are arranged in the connecting sleeve 451.

[0037] As Figure 5 and Figure 6 shown, the linkage structure 455 includes two first wedge-shaped blocks 4551 symmetrically arranged on the end faces of the support plates 452 close to each other, a telescopic block 4552 telescopically arranged in the adjusting pipe 44, and a second wedge-shaped block 4553 provided on the telescopic block 4552 and in contact with the two first wedge-shaped blocks 4551. During the process of the adjusting screw 454 driving the telescopic block 4552 to move towards the vertical pipe 3, the second wedge-shaped block 4553 drives the two first wedge-shaped blocks 4551 to move away from each other, so that the limiting pieces 453 protrude from the strip-shaped holes 441 and are embedded in the limiting grooves of the connecting sleeve 451. A rubber gasket 4521 for the limiting pieces 453 to pass through is provided on the support plate 452, and the rubber gasket 4521 is pressed tightly between the support plate 452 and the inner wall of the adjusting pipe 44.

[0038] As Figure 2 and Figure 7 shown, at the same time, a telescopic pipe fitting 49 is sleeved between the two adjusting pipes 44. The telescopic pipe fitting 49 includes a bidirectional threaded rod 491 with opposite threaded ends at both ends, two threaded pipes 492 respectively threadedly connected to the bidirectional threaded rod 491, and two sleeves 493 respectively provided on the threaded pipes 492 and used for sleeving on the adjusting pipes 44. After the two sleeves 493 move in the direction away from each other, they are sleeved on the adjusting pipes 44 and pressed tightly on the second hinge seat 42.

[0039] Implementation effect: During the use of the structure strengthening mechanism 4, the diamond-shaped frame composed of two first hinge seats 41, two second hinge seats 42, and four strengthening tubes 43 can be adjusted in size. During the process of making the two second hinge seats 42 approach each other, the two first hinge seats 41 can be driven to move away from each other, so that the embedding blocks 411 on the two first hinge seats 41 are embedded in the embedding seats 51 of the upper chord 1 and the lower chord 2 for connection. Also, because the second hinge seat 42 is telescopically arranged on the adjusting tube 44, and the limiting component 45 restricts the second hinge seat 42 from moving towards the adjacent vertical tube 3, thereby realizing the connection and fixation with the vertical tube 3. During this process, the two first hinge seats 41 can be adjusted longitudinally, and the two second hinge seats 42 and the adjusting tube 44 can be adjusted transversely, which can be adapted to different types of Bailey plates for installation to improve the structural strength of the Bailey plate and be suitable for use in long-span bridges.

[0040] When the adjusting screw 454 rotates towards the direction close to the vertical tube 3, the limiting piece 453 on the support plate 452 is driven by the linkage structure 455 to protrude from the strip-shaped hole 441 and then embedded in the limiting groove of the connecting sleeve 451, thereby realizing the limiting and fixation of the second connecting seat to prevent the diamond-shaped frame composed of two first hinge seats 41, two second hinge seats 42, and four strengthening tubes 43 from moving. When the linkage structure 455 is used, during the process of the adjusting screw 454 driving the telescopic block 4552 to move towards the vertical tube 3, the second wedge-shaped block 4553 drives the two first wedge-shaped blocks 4551 to move away from each other, so that the limiting piece 453 protrudes from the strip-shaped hole 441 and then is embedded in the limiting groove of the connecting sleeve 451. By setting the rubber gasket 4521, the rubber gasket 4521 is made to abut between the support plate 452 and the inner wall of the adjusting tube 44, thereby realizing the sealing of the connection between the adjusting tube 44 and the multiple limiting pieces 453.

[0041] Through the setting of the telescopic pipe fitting 49, the ends of the two adjusting tubes 44 can be further structurally strengthened, thereby further improving the overall structural strength of the Bailey plate. By setting the rubber shock-absorbing sleeve 412, buffering can be realized at the joints between the embedding block 411 and the upper chord 1 and between the embedding block 411 and the lower chord 2. Through the sliding setting of the vertical tubes 3 on the upper chord 1 and the lower chord 2, the multiple vertical tubes 3, the upper chord 1, and the lower chord 2 can be first combined into a whole to prevent the joints at both ends of the vertical tubes 3 from shifting during the process of being fixed by the fastening bolts 52.

[0042] Embodiment 2: A long-span Bailey plate, such as Figure 8 and Figure 9As shown in the figure, the difference from Embodiment 1 lies in the different limit assembly 45. Each side of the adjusting pipe 44 is provided with a plurality of connecting holes 442 arranged along its length direction. The limit assembly 45 includes a limit sleeve 46 sleeved on the adjusting pipe 44, a rubber shock-absorbing ring 47 provided on the end face of the limit sleeve 46 close to the second hinge seat 42 and used for abutting against the end face of the second hinge seat 42 close to the vertical pipe 3, and a plurality of limit bolts 48 threadedly connected to the limit sleeve 46 and used for being embedded in the connecting holes 442.

[0043] Implementation effect: By moving the limit sleeve 46 towards the direction close to the second hinge seat 42, the deformation that occurs during the process of the rubber shock-absorbing ring 47 abutting against the limit sleeve 46 and the second hinge seat 42 is utilized to finely adjust the position of the limit sleeve 46, so that the limit bolt 48 can be embedded in the connecting hole 442 to limit the movement of the second hinge seat 42 towards the direction close to the vertical pipe 3; at the same time, the setting of the rubber shock-absorbing ring 47 has the function of shock absorption and buffering.

[0044] This specific embodiment is only an interpretation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A large-span Bailey truss includes an upper chord (1), a lower chord (2) parallel to the upper chord (1), multiple vertical pipes (3) arranged between the upper chord (1) and the lower chord (2), and a structure strengthening mechanism (4). The structure strengthening mechanism (4) is arranged between any two adjacent vertical pipes (3), the upper chord (1), and the lower chord (2). It is characterized in that: The structure strengthening mechanism (4) includes two first hinge seats (41) symmetrically distributed up and down, two second hinge seats (42) symmetrically distributed left and right, four strengthening pipes (43) respectively hinged between adjacent first hinge seats (41) and second hinge seats (42), two adjusting pipes (44) with one end mounted on the vertical pipe (3) and the other end passing through the second hinge seat (42), and a limiting component (45) arranged between the adjusting pipe (44) and the second hinge seat (42) to limit the second hinge seat (42) from moving towards the adjacent vertical pipe (3); Embedding seats (51) are symmetrically arranged in the middle of the upper chord (1) and the lower chord (2), and embedding blocks (411) for embedding in the two embedding seats (51) are respectively arranged on the end faces of the two first hinge seats (41) away from each other. The installation process of the structure strengthening mechanism (4) includes the following steps: (S1) Pass the two adjusting pipes (44) through the second hinge seats (42), and mount one end of the adjusting pipes (44) on the vertical pipe (3); (S2) Pull the two second hinge seats (42) in the direction away from each other, so that the distance between the two first hinge seats (41) is less than the distance between the upper chord (1) and the lower chord (2); (S3) Push the two second hinge seats (42) in the direction towards each other, so that the embedding blocks (411) of the two first hinge seats (41) are embedded in the two embedding seats (51); (S4) Limit the second hinge seat (42) from moving towards the adjacent vertical pipe (3) through the limiting component (45) to prevent the embedding block (411) from disengaging from the embedding seat (51).

2. The long-span Bailey truss according to claim 1, wherein: Strip-shaped holes (441) are arranged in a row on the front and rear end faces of the adjusting pipe (44), and the limiting component (45) includes a connecting sleeve (451) arranged on the second hinge seat (42) and sleeved on the adjusting pipe (44), two support plates (452) located inside the adjusting pipe (44), a plurality of limiting pieces (453) arranged on the support plates (452) and telescopically arranged in the strip-shaped holes (441), an adjusting screw (454) slidably connected to one end of the adjusting pipe (44) away from the vertical pipe (3), and a linkage structure (455) arranged between the adjusting screw (454) and the two support plates (452) to drive the limiting pieces (453) to protrude from the strip-shaped holes (441) during the rotation of the adjusting screw (454) in the direction towards the vertical pipe (3); Limiting grooves for several limiting pieces (453) to be embedded are arranged in a row in the connecting sleeve (451).

3. The long-span Bailey truss according to claim 2, wherein: The linkage structure (455) includes two first wedge-shaped blocks (4551) symmetrically arranged on the end faces of the support plate (452) close to each other, a telescopic block (4552) telescopically arranged in the adjusting pipe (44), and a second wedge-shaped block (4553) arranged on the telescopic block (4552) and in contact with the two first wedge-shaped blocks (4551). During the process of the adjusting screw rod (454) driving the telescopic block (4552) to move towards the vertical pipe (3), the second wedge-shaped block (4553) drives the two first wedge-shaped blocks (4551) to move away from each other, so that the limiting piece (453) protrudes from the strip-shaped hole (441) and is embedded in the limiting groove of the connecting sleeve (451).

4. The long-span Bailey truss according to claim 3, characterized in that: A rubber gasket (4521) through which the limiting piece (453) passes is arranged on the support plate (452), and the rubber gasket (4521) is pressed tightly between the support plate (452) and the inner wall of the adjusting pipe (44).

5. A long-span Bailey truss according to claim 1, characterized in that: A plurality of connecting holes (442) arranged along its length direction are provided on each side surface of the adjusting pipe (44). The limiting component (45) includes a limiting sleeve (46) sleeved on the adjusting pipe (44), a rubber shock-absorbing ring (47) arranged on the end face of the limiting sleeve (46) close to the second hinge seat (42) and used for pressing tightly on the end face of the second hinge seat (42) close to the vertical pipe (3), and a plurality of limiting bolts (48) threadedly connected to the limiting sleeve (46) and used for being embedded in the connecting holes (442).

6. A long-span Bailey truss according to claim 3 or 5, characterized in that: A telescopic pipe fitting (49) is sleeved between the two adjusting pipes (44). The telescopic pipe fitting (49) includes a bidirectional threaded rod (491) with opposite threaded ends at both ends, two threaded pipes (492) respectively threadedly connected to the bidirectional threaded rod (491), and two sleeves (493) respectively arranged on the threaded pipes (492) and used for sleeving on the adjusting pipes (44). After the two sleeves (493) move in the direction away from each other, they are sleeved on the adjusting pipes (44) and pressed tightly on the second hinge seat (42).

7. A large-span Bailey truss according to claim 1, characterized in that: A part of the embedding block (411) embedded in the embedding seat (51) is wrapped with a rubber shock-absorbing sleeve (412).

8. A large-span Bailey truss according to claim 1, characterized in that: First sliding grooves (11) and second sliding grooves (21) are respectively arranged on the end faces of the upper chord (1) close to the lower chord (2). Sliding blocks (31) slidably connected in the first sliding grooves (11) and the second sliding grooves (21) are arranged at the upper and lower ends of the vertical pipe (3). Cushion plates (32) abutting against the end faces of the upper chord (1) or the lower chord (2) are respectively arranged at the upper and lower ends of the vertical pipe (3). The cushion plates (32) and the upper chord (1), and the cushion plates (32) and the lower chord (2) are respectively fixed by a plurality of fastening bolts (52).

Images