Suspender connecting structure for bailey piece steel girder suspension bridge
By using a pin connection connection mechanism in the Beret steel main beam suspension bridge, the connection structure between the boom and the double row Beret sheet is simplified, and the problems of complex connection and poor stability in the prior art are solved, thereby achieving higher structural safety and lower production costs.
Patent Information
- Application Number
- CN202422162371.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In the prior art, the connection between the boom and the double row beret has large local bending force, poor hanging point stability, complex connection and large material usage, resulting in structural safety hazards and high maintenance costs.
The pin connection connection mechanism is used to make the upper chord of the double-row Beret combination beam hingedly connect to the lower end of the suspension rod, simplifying the connection structure and fixing the suspension point position to avoid movement of the suspension point or loosening of the parts caused by vibration.
The stability and reliability of the boom connection are achieved, the problems of uneven stress and reduced connection reliability are avoided, and the production cost and construction complexity are reduced.
Smart Images
Figure CN222961874U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a boom connection structure, in particular to a boom connection structure for a Bailey girder steel main beam suspension bridge, belonging to the technical field of the design and construction of bridge engineering structures. Background Art
[0002] In the construction projects of hydropower stations in the mountainous areas of southwest China, a large number of suspension bridges using Bailey beams as the main beams have been built. The spans of these suspension bridges are generally not large and are planned as temporary or semi-permanent structures. The main beams of the suspension bridges are assembled with widely used Bailey products in the market, with a short construction period and are highly favored in some emergency projects.
[0003] In a type of design in the above-mentioned suspension bridge project, the steel main beam of the suspension bridge uses 321-type Bailey or 200-type Bailey. Double rows of Bailey are used on both the left and right sides of the main beam horizontally to form a truss beam, and the main beam is lengthened longitudinally by pin connection with Bailey connection pins. The connection between the suspension bridge boom and the double-row Bailey main beam generally uses an inverted T-shaped member or a node box composed of plate bolts. The two arms of the inverted T-shaped member are respectively propped on the lower edges of the upper chords of two Bailey, and the double lifting lugs of the inverted T-shaped member pass through between the two Bailey and are pin-connected upward with the boom. The node box is composed of three layers of bearing plates, a limiting plate, and several screw bolts. There are 2 layers of bearing plates on the top of the upper chord, and one layer of bearing plate on the bottom edge of the upper chord. The three layers of bearing plates are clamped on the upper chord by 8 screws, and a lifting lug is arranged on the upper edge of the top layer of the bearing plate and is pin-connected with the boom.
[0004] In the prior art, whether the connection between the boom and the double-row Bailey uses an inverted T-shaped member connection or a node box connection, there are some significant technical defects. The specific technical defects are as follows:
[0005] 1) For the inverted T-shaped member connection scheme, due to the limitation of the Bailey member type, the boom suspension points must be staggered from the connection pin nodes of two Bailey, and are set near the pin nodes. The boom force acts concentratedly on the middle part of the upper chord, resulting in a large local bending force on the upper chord, and it is extremely easy to cause the upper chord member to be overstressed and bent and deformed.
[0006] 2) The inverted T-shaped member and the upper chord cannot be welded and fixed, and can only be in direct natural contact. In this case, during the operation of the bridge, due to the vibration of high-speed passing vehicles, the inverted T-shaped member will move back and forth along the chord, resulting in a change in the boom spacing, poor stability and reliability of the suspension point connection, requiring frequent maintenance, a large amount of maintenance work, and there are safety hazards.
[0007] 3) For the node box connection scheme, due to the limitation of the Bailey member type, the boom suspension points must be staggered from the connection pin nodes of two Bailey and are set at the corresponding positions of the middle vertical rods of the Bailey. The boom force is directly transmitted to the middle vertical rod, increasing the bearing burden on the middle vertical rod and being unfavorable to the structural safety.
[0008] 4) The node box structure of the node box connection scheme is complex, and the construction and installation are cumbersome, which is not conducive to rapid construction. The component volume is relatively large, and the steel consumption is high. A large number of bolts are used in the node box. Under the vibration load of passing vehicles, the bolts are prone to loosen and fall off, and the reliability of the suspension point connection is poor, posing a safety hazard. Utility Model Content
[0009] The technical problem to be solved by this utility model is to provide a suspension rod connection structure for a Bailey steel main beam suspension bridge with a relatively simple structure and a firmly fixed connection part.
[0010] The technical solution adopted to solve the above technical problem is: a suspension rod connection structure for a Bailey steel main beam suspension bridge, including a cross beam, suspension rods and a double-row Bailey combined beam. Two groups of double-row Bailey combined beams are connected by a cross beam to form the suspension bridge deck. The suspension rod connection structure further includes a pin connection mechanism. The upper chord of the double-row Bailey combined beam is hinged to the lower end of the corresponding suspension rod through the pin connection mechanism.
[0011] Furthermore, each group of double-row Bailey combined beams respectively includes two Bailey combined sub-beams. Each Bailey combined sub-beam is connected by a corresponding cross beam during the assembly of the suspension bridge to form a corresponding double-row Bailey combined beam.
[0012] The preferred method of the above scheme is that each Bailey combined sub-beam respectively includes at least three Bailey sheets and at least four standard connection pins. The upper chord and the lower chord at both ends of each Bailey sheet are respectively connected into a Bailey combined sub-beam in sequence along the length direction through each standard connection pin.
[0013] Furthermore, the pin connection mechanism at least includes an ear plate assembly, a hanging connection assembly and a load-bearing pin assembly. The lower end of the hanging connection assembly is hinged to the corresponding position of the upper chord of each Bailey combined sub-beam through the ear plate assembly with the cooperation of the load-bearing pin assembly. The upper end of the hanging connection assembly is hinged to the corresponding suspension rod through the load-bearing pin assembly.
[0014] The preferred method of the above scheme is that the hanging connection assembly includes a plurality of hanging plates with the same number as the suspension rods. The lower ends of each hanging plate are respectively hinged to the corresponding position of the upper chord of each Bailey combined sub-beam through the ear plate assembly at the corresponding position with the cooperation of the load-bearing pin assembly. The upper ends of each hanging plate are hinged to the corresponding suspension rod through the load-bearing pin assembly.
[0015] Furthermore, the load-bearing bolt assembly includes an upper bolt group and a lower load-bearing bolt group. The upper bolt group includes a plurality of upper bolts equal in number to the number of suspension rods, and the lower load-bearing bolt group includes a plurality of lower load-bearing bolts equal in number to the number of suspension rods. The lower ends of the hanging plates are respectively hinged to the corresponding positions of the upper chords of the Bailey truss composite girders through the ear plate assemblies at the corresponding positions and in cooperation with the lower load-bearing bolts. The upper ends of the hanging plates are hinged to the corresponding suspension rods through the upper bolts.
[0016] The preferred embodiment of the above solution is that the ear plate assembly includes a plurality of groups of connecting ear plates equal in number to the number of suspension rods. Each group of connecting ear plates includes two fixed ear pieces. The two fixed ear pieces of each group of connecting ear plates are respectively arranged at the corresponding positions on the upper chords of two Bailey truss composite girders in the same group with their positions adapted to each other. The lengths of the lower load-bearing bolts are respectively adapted to the arrangement widths of the two fixed ear pieces of each group of connecting ear plates. Each hanging plate is respectively hinged to the two Bailey truss composite girders in the same group through its lower end inserted between the corresponding two fixed ear pieces and in cooperation with the lower load-bearing bolts.
[0017] Furthermore, the lower load-bearing bolt group further includes rubber shock-absorbing blocks and spring safety clips. At least one rubber shock-absorbing block is respectively interposed between the hanging plate and the fixed ear piece on the corresponding side. A spring safety clip is respectively fixed at each end of the lower load-bearing bolt extending out of the fixed ear piece.
[0018] The preferred embodiment of the above solution is that the fixed ear piece is the pin connection point on the upper chord of the corresponding end of the corresponding Bailey truss.
[0019] Furthermore, the lower load-bearing bolt is processed from a round steel bar made of 40Cr material.
[0020] The beneficial effects of the present utility model are as follows: The technical solution provided in this application is based on the existing cross beam, suspension rods and double-row Bailey truss composite beam, and in combination with the structural characteristics that two groups of double-row Bailey truss composite beams are connected by a cross beam to form the structure of the suspension bridge deck. By adding a pin connection mechanism to form the suspension rod connection structure of this application, and then the upper chord of the double-row Bailey truss composite beam is hinged to the lower end of the suspension rod at the corresponding position through the pin connection mechanism. In this way, not only the complex connection structure of using an inverted T-shaped member or a joint box to connect the suspension rod and the upper chord of the double-row Bailey truss composite beam is omitted, but also because this application only realizes the direct hinged connection between each suspension rod and the corresponding upper chord of the double-row Bailey truss composite beam by adding a pin connection mechanism, the structure is relatively simple, the connection part is fixed very firmly and reliably, avoiding the situation of suspension point movement or part loosening and falling off caused by vibration during the operation of the suspension bridge, which may lead to uneven force or reduction or even failure of connection reliability. Moreover, because the pin connection mechanism of this application omits the complex joint box, the production cost can be significantly reduced and the installation is convenient. Description of the Drawings
[0021] Figure 1 This is a transverse sectional view of the suspension bridge related to the hanger connection structure of the Bailey steel main beam suspension bridge of the present utility model;
[0022] Figure 2 is Figure 1 View A of;
[0023] Figure 3 is Figure 2 Side view of.
[0024] The markings in the figure are: cross beam 1, hanger 2, double-row Bailey combined beam 3, Bailey combined sub-beam 4, standard connecting pin 5, hanging plate 6, upper inserting pin 7, lower load-bearing inserting pin 8, fixed ear piece 9, rubber shock absorber 10, spring safety clip 11. Specific implementation manner
[0025] As Figure 1 , Figure 2 and Figure 3 shown is a hanger connection structure for a Bailey steel main beam suspension bridge provided by the present utility model, which has a relatively simple structure and a firmly fixed connection part. The hanger connection structure includes a cross beam 1, a hanger 2 and a double-row Bailey combined beam 3. Two groups of double-row Bailey combined beams 3 are connected by a cross beam 1 to form the suspension bridge deck. The hanger connection structure also includes a pin connection mechanism. The upper chord of the double-row Bailey combined beam 3 is hinged to the lower end of the corresponding hanger 2 through the pin connection mechanism. The technical solution provided in this application is based on the existing cross beam, hanger and double-row Bailey combined beam, and combined with the structural characteristics that two groups of double-row Bailey combined beams are connected by a cross beam to form the suspension bridge deck. By adding a pin connection mechanism to form the hanger connection structure of this application, and then making the upper chord of the double-row Bailey combined beam be hinged to the lower end of the corresponding hanger through the pin connection mechanism. In this way, not only the complex connection structure of using an inverted T-shaped member or a joint box to connect the hanger and the upper chord of the double-row Bailey combined beam is omitted, but also, since this application only realizes the direct hinged connection between each hanger and the corresponding upper chord of the double-row Bailey combined beam by adding a pin connection mechanism, the structure is relatively simple, the connection part is fixed very firmly and reliably, avoiding the situation of hanger point movement or part loosening and falling off caused by vibration during the operation of the suspension bridge, thereby causing uneven force or reduction or even failure of connection reliability. Moreover, since the pin connection mechanism of this application omits the complex joint box, it can also significantly reduce the production cost and facilitate installation.
[0026] Combined with the characteristics of the existing technology, in order to make the best use of the existing structure and reduce the design and construction costs as much as possible, each group of double-row Bailey girder composite beams 3 of this application respectively includes two Bailey girder composite sub-beams 4. Each Bailey girder composite sub-beam 4 is connected by a corresponding cross beam 1 during the assembly process of the suspension bridge to form a corresponding double-row Bailey girder composite beam 3. A more specific structure is that each Bailey girder composite sub-beam 4 respectively includes at least three Bailey girders and at least four standard connecting pins 5. The upper chord bars and lower chord bars at both ends of each Bailey girder are sequentially connected along the length direction by each standard connecting pin 5 to form a Bailey girder composite sub-beam 4.
[0027] As the main improved structure of this application, in order to adapt to the structure of the above-mentioned existing Bailey girder steel main beam suspension bridge, and at the same time simplify the structure as much as possible to facilitate the manufacturing of parts, the on-site assembly of the suspension bridge main body, and the maintenance and repair during subsequent use, the pin-connected connection mechanism of this application at least includes an ear plate assembly, a hanging connection assembly, and a load-bearing pin assembly. The lower end of the hanging connection assembly is hingedly connected to the corresponding position of the upper chord bar of each Bailey girder composite sub-beam through the ear plate assembly with the cooperation of the load-bearing pin assembly. The upper end of the hanging connection assembly is hingedly connected to the corresponding position of the suspender 2 through the load-bearing pin assembly. At this time, the hanging connection assembly includes a plurality of hanging plates 6 with the same number as the number of suspenders. The lower ends of each hanging plate 6 are respectively hingedly connected to the corresponding positions of the upper chord bars of each Bailey girder composite sub-beam through the ear plate assembly at the corresponding positions with the cooperation of the load-bearing pin assembly. The upper ends of each hanging plate 6 are hingedly connected to the corresponding position of the suspender 2 through the load-bearing pin assembly. The load-bearing pin assembly includes an upper pin group and a lower load-bearing pin group. The upper pin group includes a plurality of upper pins 7 with the same number as the number of suspenders. The lower load-bearing pin group includes a plurality of lower load-bearing pins 8 with the same number as the number of suspenders. The lower ends of each hanging plate 6 are respectively hingedly connected to the corresponding positions of the upper chord bars of each Bailey girder composite sub-beam through the ear plate assembly at the corresponding positions with the cooperation of each lower load-bearing pin 8. The upper ends of each hanging plate 6 are hingedly connected to the corresponding position of the suspender 2 through the upper pin 7. The ear plate assembly includes a plurality of groups of connecting ear plates with the same number as the number of suspenders. Each group of connecting ear plates respectively includes two fixed ear pieces 9. The two fixed ear pieces 9 of each group of connecting ear plates are arranged at the corresponding positions of the upper chord bars of two Bailey girder composite sub-beams in the same group with mutually adapted positions. The length of each lower load-bearing pin 8 is respectively adapted to the arrangement width of the two fixed ear pieces 9 of each group of connecting ear plates. Each hanging plate 6 is respectively hingedly connected to the two Bailey girder composite sub-beams 4 in the same group through its lower end inserted between the corresponding two fixed ear pieces 9 with the cooperation of the lower load-bearing pin 8.
[0028] Furthermore, in order to improve the shock absorption effect and avoid the loosening and falling off of the hinge connection parts as much as possible, the lower load-bearing pin group described in the present application also includes a rubber shock-absorbing block 10 and a spring safety card 11. At least one rubber shock-absorbing block 10 is padded between the hanging plate 6 and the fixed ear piece 9 on the corresponding side, and a spring safety card 11 is fixedly installed at each end of the lower load-bearing pin 8 extending out of the fixed ear piece 9. Accordingly, in order to improve the bearing capacity, the lower load-bearing pin 8 of the present application is processed from a round steel bar made of 40Cr material.
[0029] At the same time, in order to simplify the structure of the present application to the greatest extent, the fixed ear piece 9 of the present application is a pin connection point on the upper chord rod at the corresponding end of the corresponding Bailey piece.
[0030] In summary, the above technical solution provided by this application also has the following advantages:
[0031] 1. The technology of the present application is adopted to make the suspension rod hanging point located at the node position of the Bailey plate connecting pin, which completely eliminates the rod damage problem caused by the large local bending moment stress at the Bailey plate upper chord rod hanging point position in the original technology;
[0032] 2. By adopting the technology of the present application, the suspension point of the suspender rod is located at the node position of the Bailey plate connecting pin, and the suspension rod force is directly borne by the four end vertical rods. The force of a single vertical rod is reduced by about 50% compared with the node box solution of the original technology.
[0033] 3. By adopting the technology of the present application, the hanger is fixedly hinged on the Bailey plate steel rod connecting pin, which is safer and more reliable than the inverted T-piece and node box connection performance of the original technology.
[0034] 4. The technology of this application eliminates the bulky node box in the original technology, saves a lot of engineering materials, reduces the dead weight of the bridge, and reduces the construction cost.
[0035] 5. The technology of this application makes installation and construction more convenient and can save construction time.
[0036] The technical solution of the present application is further described below through specific embodiments:
[0037] Embodiment 1
[0038] According to the structural design, this technical solution is described as follows:
[0039] 1. Remove the connecting pin of the upper chord of the Bailey.
[0040] 2. Add a cylindrical steel rod made of 40Cr and with a diameter of 49.5mm. The length of the steel rod is increased by the center distance of two Bailey plates based on the original truss pin length. Both ends of the steel rod have slope angles and spring safety holes are opened at both ends of the steel rod.
[0041] 3. Replace the upper chord connecting pin with the steel bar in item 2 above, and pass the steel bar through two Bailey trusses in a penetrating manner.
[0042] 4. The lower end of the suspension rod is designed with a single-ear pin hole and sleeved on the steel bar, that is, the suspension point of the suspension rod is located at the pin-connected node of the Bailey truss.
[0043] 5. A rubber shock absorber is provided between the single ear of the suspension rod and the upper chord.
Claims
1. A hanger connection structure for a Bailey steel main beam suspension bridge, comprising a crossbeam (1), a hanger (2) and a double-row Bailey composite beam (3), wherein two groups of double-row Bailey composite beams (3) are connected via the crossbeam (1) to form a suspension bridge deck, and characterized in that: The suspension rod connection structure also includes a pin connection mechanism, and the upper chord of the double-row Bailey plate composite beam (3) is hingedly connected to the lower end of the suspension rod (2) at the corresponding position through the pin connection mechanism.
2. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 1 is characterized in that: Each group of double-row Bailey plate composite beams (3) comprises two Bailey plate composite sub-beams (4), and each Bailey plate composite sub-beam (4) is connected by a corresponding crossbeam (1) during the assembly of the suspension bridge to form a corresponding double-row Bailey plate composite beam (3).
3. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 2 is characterized in that: Each Bailey plate combined sub-beam (4) comprises at least three Bailey plates and at least four standard connecting pins (5), and the upper chord rods and the lower chord rods at both ends of each Bailey plate are respectively connected in sequence along the length direction through the standard connecting pins (5) to form a Bailey plate combined sub-beam (4).
4. The hanger rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 1, 2 or 3, characterized in that: The pin connection mechanism comprises at least an ear plate assembly, a hanging connection assembly and a load-bearing latch assembly. The lower end of the hanging connection assembly is hingedly connected to the corresponding position of the upper chord of each bailey plate combined sub-beam through the ear plate assembly in cooperation with the load-bearing latch assembly. The upper end of the hanging connection assembly is hingedly connected to the hanging rod (2) at the corresponding position through the load-bearing latch assembly.
5. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 4 is characterized in that: The hanging connection assembly comprises a plurality of hanging plates (6) whose number is equal to the number of hanging rods. The lower end of each hanging plate (6) is hingedly connected to the corresponding position of the upper chord of each bailey plate combined sub-beam through the ear plate assembly at the corresponding position in cooperation with the load-bearing latch assembly. The upper end of each hanging plate (6) is hingedly connected to the hanging rod (2) at the corresponding position through the load-bearing latch assembly.
6. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 5 is characterized in that: The load-bearing latch assembly comprises an upper latch assembly and a lower load-bearing latch assembly, wherein the upper latch assembly comprises a plurality of upper latches (7) whose number is equal to the number of the suspension rods, and the lower load-bearing latch assembly comprises a plurality of lower load-bearing latches (8) whose number is equal to the number of the suspension rods, wherein the lower ends of the respective hanging plates (6) are respectively hingedly connected to the corresponding positions of the upper chords of the respective bailey plate combined sub-beams through the ear plate assemblies at the corresponding positions in cooperation with the respective lower load-bearing latches (8), and the upper ends of the respective hanging plates (6) are hingedly connected to the suspension rods (2) at the corresponding positions through the upper latches (7).
7. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 6 is characterized in that: The ear plate assembly comprises a plurality of groups of connecting ear plates, the number of which is equal to the number of suspension rods, each group of connecting ear plates comprises two fixed ear plates (9), the two fixed ear plates (9) of each group of connecting ear plates are arranged at corresponding positions of the upper chords of two Bailey plate combined sub-beams of the same group in a mutually adaptive manner, the length of each lower load-bearing pin (8) is adapted to the arrangement width of the two fixed ear plates (9) of each group of connecting ear plates, and each hanging plate (6) is hingedly connected to the two Bailey plate combined sub-beams (4) of the same group through the lower end thereof inserted between the corresponding two fixed ear plates (9) in cooperation with the lower load-bearing pin (8).
8. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 7 is characterized in that: The lower load-bearing latch assembly further comprises a rubber shock-absorbing block (10) and a spring safety card (11). At least one rubber shock-absorbing block (10) is padded between the hanging plate (6) and the fixed ear piece (9) on the corresponding side. A spring safety card (11) is fixedly mounted on both ends of the lower load-bearing latch (8) extending out of the fixed ear piece (9).
9. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 8, characterized in that: The fixed lugs (9) are pinned connection points on the upper chord rods at the corresponding ends of the corresponding Bailey plates.
10. The suspension rod connection structure for Bailey sheet steel main beam suspension bridge according to claim 9, characterized in that: The lower load-bearing latch (8) is processed from a round steel bar made of 40Cr material.