Assembly type steel bridge hoisting connecting system and installation method

Abstract

The present application relates to a kind of assembly type steel bridge hoisting connection system and installation method, belong to assembly type steel bridge construction technical field.The first steel bridge truss unit and the second steel bridge truss unit are included in adjacent arrangement, first connecting part is arranged on the first steel bridge truss unit, second connecting part is arranged on the second steel bridge truss unit, further include hoisting system, for hoisting the first steel bridge truss unit and the second steel bridge truss unit are connected.The present application has the following beneficial effects: hoisting system first, second steel bridge truss unit is smoothly hoisted to design installation position, adjusts two section trusses and accurately approaches, so that first connecting part and second connecting part correspond and fit, complete the preliminary butt joint positioning of truss section, provide foundation for subsequent high-strength bolt fastening, overall forming.Adopt factory prefabrication, construction mode of high-strength bolt connection on site, cooperate with the quick disassembly and assembly hoisting tool of the present application, can shorten the installation time of single section truss, speed up overall construction progress.

Description

Technical Field

[0001] This invention relates to a prefabricated steel bridge hoisting and connection system and installation method, belonging to the field of prefabricated steel bridge construction technology. Background Technology

[0002] The construction of prefabricated steel bridges generally adopts a construction mode of factory prefabrication of segments and on-site hoisting and assembly. This involves first standardizing the production of steel bridge truss segments in the factory, then drilling and machining the joints, connecting plates, and end members at the truss ends according to design requirements, and finally transporting them to the construction site. Each segment is then hoisted to its designed position using hoisting equipment, aligned, and connected using high-strength bolts or welding to ultimately form the integral steel bridge structure. This mode offers advantages such as fast construction speed, controllable quality, and minimal impact on the site environment, and has been widely used in bridge projects both domestically and internationally.

[0003] Current technologies are not comprehensive and have the following drawbacks: lack of safety protection during hoisting and high risks associated with working at heights. Existing hoisting equipment only uses hooks, pallets, or lashing straps to support and lift trusses, without an independent fall protection structure. Since steel bridge truss units typically have four sets of parallel straight members, if pallets slip, lashing straps break, or hoisting sway occurs during hoisting, the truss is highly susceptible to detaching from the supporting structure and falling from a height. This not only damages the components but also causes serious safety accidents, threatening the lives of on-site construction workers.

[0004] To solve one of the above problems, there is an urgent need for a prefabricated steel bridge hoisting and connection system and installation method. Summary of the Invention

[0005] Based on the shortcomings of the existing technology, the technical problem to be solved by the present invention is: how to achieve dual load-bearing and fall protection for steel bridge truss units, while realizing adaptive adjustment of the width of the hoisting tool, integration of truss hoisting and preliminary docking, rapid disassembly and assembly of fall protection safety belts, and standardization of high-strength bolt connection process, thereby improving the overall structural stability of the steel bridge and ensuring stable operation of hoisting. To this end, a prefabricated steel bridge hoisting connection system and installation method are provided.

[0006] The prefabricated steel bridge hoisting and connection system of the present invention is characterized in that it includes a first steel bridge truss unit and a second steel bridge truss unit arranged adjacent to each other. The first steel bridge truss unit is provided with a first connecting part, and the second steel bridge truss unit is provided with a second connecting part. It also includes a hoisting system for hoisting and guiding the first steel bridge truss unit and the second steel bridge truss unit to dock, providing the prerequisite for the subsequent docking of two truss segments.

[0007] The hoisting system smoothly lifts the first and second steel bridge truss units to their designed installation positions, adjusts the two truss segments to precisely align them, and ensures that the first and second connecting parts are aligned and fitted together, completing the initial docking and positioning of the truss segments and providing a foundation for subsequent high-strength bolt fastening and overall forming.

[0008] The lifting system is equipped with a steel structure bridge lifting device at its execution end. The steel structure bridge lifting device includes an outer tube, an inner sliding rod, and a lifting connection mechanism. One end of the inner sliding rod is inserted into the outer tube and slides in cooperation with the inner wall of the outer tube. A vertical left load-bearing rod is fixed to the outer end of the outer tube. A left support plate is vertically installed at the bottom end of the left load-bearing rod. A vertical right load-bearing rod is vertically installed at the outer end of the inner sliding rod. A right support plate is installed at the bottom end of the right load-bearing rod. The system also includes a fall protection safety strap. One end of the fall protection safety strap is fixed to the left load-bearing rod, and the other end of the fall protection safety strap is detachably installed on the right load-bearing rod.

[0009] The existing steel bridge truss unit has four sets of parallel straight bars. The left and right support plates are used to support the two sets of straight bars of the steel bridge truss unit, respectively. The fall protection safety belt goes around the bottom of the steel bridge truss unit to assist in lifting the steel bridge truss unit. If the steel bridge truss unit detaches from the left and right support plates and falls accidentally, the fall protection safety belt can effectively prevent the steel bridge truss unit from falling further, reducing construction risks and ensuring the stable operation of the hoisting.

[0010] Preferably, the lifting connection mechanism includes a left hinged support seat on the outer sleeve and a right hinged support seat on the inner slide rod, and also includes a left connecting rod and a right connecting rod arranged symmetrically. The bottom end of the left connecting rod is hinged to the left hinged support seat, and the bottom end of the right connecting rod is hinged to the right hinged support seat. The other ends of the left and right connecting rods are both hinged to the main lifting seat. The main lifting seat is provided with a main lifting lug for connecting to the lifting equipment.

[0011] The outer sleeve and inner sliding rod form a telescopic structure, which can adjust the spacing between the left and right load-bearing hangers according to the width of the steel bridge truss unit to adapt to steel bridge truss units of different widths.

[0012] Preferably, the fall arrestor strap is a nylon flat strap, which has high structural strength.

[0013] Preferably, one end of the fall arrestor strap is wound around a fall arrestor strap flexible winder on the right load-bearing boom. This allows for detachable installation and tightening of the fall arrestor strap.

[0014] Preferably, the fall arrestor safety harness soft winder includes a left clamping arm and a right clamping arm arranged parallel to each other and spaced apart. Both the left and right clamping arms are welded to the right load-bearing boom. It also includes a winding shaft passing through the left and right clamping arms. One end of the winding shaft passes through the left clamping arm and is connected to a first anti-rotation device on the outer wall of the left clamping arm. A non-through-end slot is provided along the length of the winding shaft. The first anti-rotation device includes an anti-rotation insert that mates with the slot. The anti-rotation insert is mounted on the insert fixing frame, which is mounted on the left clamping arm by fixing bolt A. The anti-rotation insert is inserted into the threading slot at the end of the wrapping shaft. A thrust baffle is mounted on the right clamping arm by fixing bolt B. The wrapping shaft is located between the insert fixing frame and the thrust baffle. The inner side of the thrust baffle abuts against the end of the wrapping shaft. The end of the fall-prevention safety strap passes through the threading slot, and part of the fall-prevention safety strap is wrapped around the wrapping shaft.

[0015] The left and right support plates are used to support the two sets of straight rods of the steel bridge truss unit, respectively. One end of the fall protection safety strap is fixedly connected to the left load-bearing rod, and the other end of the fall protection safety strap passes under the steel bridge truss unit and then passes through the strap slot. Part of the fall protection safety strap is wrapped around the strap winding shaft to tighten the fall protection safety strap. The tightened fall protection safety strap is used to assist in lifting the steel bridge truss unit and can also prevent the left and right load-bearing rods from moving away from each other.

[0016] After the winding shaft has tightened the fall arrestor safety strap, the anti-rotation insert plate is inserted into the strap insertion slot, and the insert plate fixing bracket is fixedly connected to the left clamping arm by fixing bolt A. This prevents the winding shaft from rotating relative to the left and right clamping arms. Finally, the thrust baffle is installed. Both ends of the winding shaft cooperate with the insert plate fixing bracket and the thrust baffle respectively to prevent the winding shaft from moving laterally. This completes the locking of the winding shaft. However, after the steel bridge truss unit is hoisted, the thrust baffle can be removed first, followed by the insert plate fixing bracket, to release the restriction on the winding shaft.

[0017] Preferably, the length of the threading slot is 4 / 5 to 1 / 3 of the length of the wrapping shaft.

[0018] Preferably, the cross-section of the wrapping shaft is circular, and the left and right clamping arms are respectively provided with circular holes through which the wrapping shaft passes. The inner diameter of the circular holes is slightly larger than the outer diameter of the wrapping shaft, so as to ensure that the wrapping shaft rotates relative to the left and right clamping arms.

[0019] Preferably, both the left and right load-bearing booms are equipped with reversing wheels at their bottom ends, and the fall arrestor safety straps pass over their respective outer sides. This prevents the fall arrestor safety straps from contacting the left and right load-bearing booms, thus avoiding excessive wear on the safety straps.

[0020] Preferably, a left reinforcing rib plate and a right reinforcing rib plate are welded to the upper surfaces of the left and right support plates, respectively. Both the left and right reinforcing rib plates are triangular in structure, and are welded to the left and right load-bearing hangers, respectively. This enhances structural strength.

[0021] Preferably, the outer sleeve, inner sliding rod, left load-bearing rod, and right load-bearing rod are all hollow rectangular steel tube structures. The left load-bearing rod is welded to the outer sleeve, and a left reinforcing connecting rod is welded between the left load-bearing rod and the outer sleeve. The right load-bearing rod is welded to the inner sliding rod, and a right reinforcing connecting rod is welded between the right load-bearing rod and the inner sliding rod. This ensures the reliability of the connections between the outer sleeve and the left load-bearing rod, and between the inner sliding rod and the right load-bearing rod, enhances structural strength, and guarantees successful hoisting and installation.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The prefabricated steel bridge hoisting and connection system of the present invention smoothly hoists the first and second steel bridge truss units to the designed installation position, adjusts the two truss segments to precisely approach each other, so that the first connection part and the second connection part correspond and fit together, and completes the initial docking and positioning of the truss segments, providing a foundation for subsequent high-strength bolt fastening and overall forming.

[0024] The prefabricated steel bridge hoisting connection system of this invention uses two sets of parallel straight bars supporting the steel bridge truss unit through a left support plate and a right support plate, and a fall-prevention safety strap that passes under the truss to achieve dual load-bearing. When the truss accidentally detaches from the support plate, the fall-prevention safety strap can directly prevent the truss from falling, fundamentally solving the safety hazard of traditional hoisting equipment without fall protection and ensuring the stable operation of high-altitude hoisting operations.

[0025] The prefabricated steel bridge hoisting and connection system of the present invention has a sliding telescopic main structure composed of an outer sleeve and an inner sliding rod. The distance between the left and right load-bearing hangers can be flexibly adjusted according to the width of steel bridge truss units of different specifications. It can adapt to the hoisting of prefabricated steel bridge trusses of multiple spans and sizes without changing tooling, thereby reducing the cost of construction equipment.

[0026] The prefabricated steel bridge hoisting and connection system of the present invention adopts a locking structure of wrapping shaft and anti-rotation insert for the fall protection safety belt, which can quickly complete the installation, tightening and locking of the belt; after hoisting, the belt can be unlocked by removing the thrust baffle and the insert fixing frame. The on-site installation and disassembly process is simple, shortening the hoisting preparation and finishing time.

[0027] The prefabricated steel bridge installation method described in this invention adopts a construction mode of factory prefabrication and on-site high-strength bolt connection. Through the process of precise alignment of the connecting parts and connecting plates, and symmetrical initial and final tightening of bolt groups from the center to the periphery, the connection surfaces of the truss segments are ensured to fit tightly and the bolts are subjected to uniform stress, thereby improving the overall connection rigidity and structural stability of the steel bridge. With the quick disassembly and hoisting tooling of this invention, the installation time of a single truss segment can be shortened, and the overall construction progress can be accelerated. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the structure of the soft winder for the fall arrest safety harness;

[0031] Figure 3 for Figure 2 Structural diagram of the rotating shaft with intermediate winding;

[0032] Figure 4 for Figure 2 Cross section of the winding shaft Figure 1

[0033] Figure 5 for Figure 2 Cross section of the winding shaft Figure 2 ;

[0034] Figure 6 This is a diagram showing the usage state of the present invention.

[0035] In the diagram: 1. Outer tube; 2. Inner sliding rod; 3. Left hinged support seat; 4. Right hinged support seat; 5. Left connecting rod; 6. Right connecting rod; 7. Main lifting seat; 8. Main lifting lug; 9. Left load-bearing lifting rod; 10. Right load-bearing lifting rod; 11. Left support plate; 12. Right support plate; 13. Fall protection safety strap; 14. Left reinforcing rib plate; 15. Right reinforcing rib plate; 16. Left reinforcing connecting rod; 17. Right reinforcing connecting rod; 18. Left clamping arm; 19. Right clamping arm; 20. Belt winding shaft; 21. Belt threading slot; 22. Anti-rotation insert plate; 23. Insert plate fixing bracket; 24. Fixing bolt A; 25. Thrust baffle; 26. Fixing bolt B; 27. Reversing wheel; 28. Steel bridge truss unit. Detailed Implementation

[0036] The present invention will now be further described with reference to the accompanying drawings:

[0037] The present invention will be further illustrated by specific embodiments below, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0038] Example 1, as Figure 1-2 As shown, the prefabricated steel bridge hoisting and connection system includes a first steel bridge truss unit and a second steel bridge truss unit arranged adjacent to each other. The first steel bridge truss unit is provided with a first connecting part, and the second steel bridge truss unit is provided with a second connecting part. It also includes a hoisting system for hoisting and guiding the first steel bridge truss unit and the second steel bridge truss unit to dock.

[0039] The hoisting system smoothly lifts the first and second steel bridge truss units to their designed installation positions, adjusts the two truss segments to precisely align them, and ensures that the first and second connecting parts are aligned and fitted together, completing the initial docking and positioning of the truss segments and providing a foundation for subsequent high-strength bolt fastening and overall forming.

[0040] The lifting system is equipped with a steel structure bridge lifting device at its execution end. The steel structure bridge lifting device includes an outer tube 1, an inner sliding rod 2, and a lifting connection mechanism. One end of the inner sliding rod 2 is inserted into the outer tube 1 and slides in cooperation with the inner wall of the outer tube 1. A vertical left load-bearing rod 9 is fixed to the outer end of the outer tube 1. A left support plate 11 is vertically installed at the bottom end of the left load-bearing rod 9. A vertical right load-bearing rod 10 is vertically installed at the outer end of the inner sliding rod 2. A right support plate 12 is installed at the bottom end of the right load-bearing rod 10. The system also includes a fall-prevention safety strap 13. One end of the fall-prevention safety strap 13 is fixed to the left load-bearing rod 9, and the other end of the fall-prevention safety strap 13 is detachably installed on the right load-bearing rod 10.

[0041] Reference Figure 6 The existing steel bridge truss unit 28 has four sets of parallel straight bars. The left support plate 11 and the right support plate 12 are used to support the two sets of straight bars of the steel bridge truss unit 28, respectively. The fall protection safety strap 13 passes under the steel bridge truss unit 28 to assist in lifting the steel bridge truss unit 28. If the steel bridge truss unit 28 detaches from the left support plate 11 and the right support plate 12 and falls accidentally, the fall protection safety strap 13 can effectively prevent the steel bridge truss unit 28 from falling further, reducing construction risks and ensuring the stable operation of the hoisting.

[0042] Example 2, as Figure 1-2As shown, the prefabricated steel bridge hoisting and connection system includes a first steel bridge truss unit and a second steel bridge truss unit arranged adjacent to each other. The first steel bridge truss unit is provided with a first connecting part, and the second steel bridge truss unit is provided with a second connecting part. It also includes a hoisting system for hoisting and guiding the first steel bridge truss unit and the second steel bridge truss unit to dock.

[0043] The lifting system is equipped with a steel structure bridge lifting device at its execution end. The steel structure bridge lifting device includes an outer tube 1, an inner sliding rod 2, and a lifting connection mechanism. One end of the inner sliding rod 2 is inserted into the outer tube 1 and slides in cooperation with the inner wall of the outer tube 1. A vertical left load-bearing rod 9 is fixed to the outer end of the outer tube 1. A left support plate 11 is vertically installed at the bottom end of the left load-bearing rod 9. A vertical right load-bearing rod 10 is vertically installed at the outer end of the inner sliding rod 2. A right support plate 12 is installed at the bottom end of the right load-bearing rod 10. The system also includes a fall-prevention safety strap 13. One end of the fall-prevention safety strap 13 is fixed to the left load-bearing rod 9, and the other end of the fall-prevention safety strap 13 is detachably installed on the right load-bearing rod 10.

[0044] Furthermore, the lifting connection mechanism includes a left hinged support 3 on the outer sleeve 1 and a right hinged support 4 on the inner slide rod 2, and also includes a left connecting rod 5 and a right connecting rod 6 arranged symmetrically. The bottom end of the left connecting rod 5 is hinged to the left hinged support 3, and the bottom end of the right connecting rod 6 is hinged to the right hinged support 4. The other ends of the left connecting rod 5 and the right connecting rod 6 are both hinged to the main lifting seat 7. The main lifting seat 7 is provided with a main lifting lug 8 for connecting with the lifting equipment.

[0045] The outer sleeve 1 and the inner sliding rod 2 form a telescopic structure, which can adjust the spacing between the left load-bearing hanger 9 and the right load-bearing hanger 10 according to the width of the steel bridge truss unit 28, so as to adapt to steel bridge truss units 28 of different widths.

[0046] Furthermore, the fall arrestor strap 13 is a nylon flat strap, which has high structural strength.

[0047] Furthermore, one end of the fall arrestor strap 13 is wound around the fall arrestor strap flexible winder on the right load-bearing boom 10. This allows for detachable installation and tightening of the fall arrestor strap 13.

[0048] Furthermore, referring to Figure 2 , Figure 3 and Figure 4The fall arrestor safety harness includes a left clamping arm 18 and a right clamping arm 19 arranged parallel to each other and spaced apart. Both the left and right clamping arms 18 and 19 are welded to the right load-bearing boom 10. It also includes a winding shaft 20 that passes through the left and right clamping arms 18 and 19. One end of the winding shaft 20 passes through the left clamping arm 18 and is connected to a first anti-rotation device on the outer wall of the left clamping arm 18. A non-through-end strap-passing groove 21 is provided along the length of the winding shaft 20. The first anti-rotation device includes an anti-rotation insert 22 that cooperates with the strap-passing groove 21. The insert plate 22 is installed on the insert plate fixing frame 23, which is installed on the left clamping arm 18 by fixing bolt A24. The anti-rotation insert plate 22 is inserted into the threading slot 21 at the end of the wrapping shaft 20. The right clamping arm 19 is equipped with a thrust baffle 25 by fixing bolt B26. The wrapping shaft 20 is located between the insert plate fixing frame 23 and the thrust baffle 25. The inner side of the thrust baffle 25 abuts against the end of the wrapping shaft 20. The end of the fall protection safety strap 13 passes through the threading slot 21, and part of the fall protection safety strap 13 is wrapped around the wrapping shaft 20.

[0049] In use, the left support plate 11 and the right support plate 12 are respectively used to support the two sets of straight rods of the steel bridge truss unit 28. One end of the fall protection safety strap 13 is fixedly connected to the left load-bearing rod 9, and the other end of the fall protection safety strap 13 passes under the steel bridge truss unit 28 and then passes through the strap slot 21. Part of the fall protection safety strap 13 is wrapped around the strap winding shaft 20 to tighten the fall protection safety strap 13. The tightened fall protection safety strap 13 is used to assist in lifting the steel bridge truss unit 28 and can also limit the left load-bearing rod 9 and the right load-bearing rod 10 from moving away from each other.

[0050] After the winding shaft 20 tightens the fall-prevention safety strap 13, the anti-rotation insert 22 is inserted into the strap insertion slot 21, and the insert fixing bracket 23 is fixedly connected to the left clamping arm 18 by fixing bolt A24, thus preventing the winding shaft 20 from rotating relative to the left clamping arm 18 and the right clamping arm 19. Finally, the thrust baffle 25 is installed. The two ends of the winding shaft 20 cooperate with the insert fixing bracket 23 and the thrust baffle 25 respectively to prevent the winding shaft 20 from moving laterally. This completes the locking of the winding shaft 20. However, after the steel bridge truss unit 28 is hoisted, the thrust baffle 25 can be removed first, and then the insert fixing bracket 23 can be removed to release the restriction on the winding shaft 20.

[0051] The length of the threading slot 21 is 1 / 3 of the length of the winding shaft 20.

[0052] Furthermore, the cross-section of the wrapping shaft 20 is circular, and the left clamping arm 18 and the right clamping arm 19 are respectively provided with circular holes through which the wrapping shaft 20 passes. The inner diameter of the circular holes is slightly larger than the outer diameter of the wrapping shaft 20, so as to ensure that the wrapping shaft 20 rotates relative to the left clamping arm 18 and the right clamping arm 19.

[0053] Furthermore, both the left load-bearing boom 9 and the right load-bearing boom 10 are equipped with reversing wheels 27 at their bottom ends, and the fall arrest safety straps 13 pass over the outer sides of the corresponding 27. This prevents the fall arrest safety straps 13 from contacting the left load-bearing boom 9 and the right load-bearing boom 10, thus avoiding excessive wear on the fall arrest safety straps 13.

[0054] Furthermore, a left reinforcing rib plate 14 and a right reinforcing rib plate 15 are welded to the upper surfaces of the left support plate 11 and the left support plate 12, respectively. Both the left and right reinforcing rib plates 14 and 15 are triangular structures, and are welded to the left load-bearing hanger 9 and the right load-bearing hanger 10, respectively, to enhance structural strength.

[0055] Furthermore, the outer sleeve 1, inner sliding rod 2, left load-bearing rod 9, and right load-bearing rod 10 are all hollow rectangular steel pipe structures. The left load-bearing rod 9 is welded to the outer sleeve 1, and a left reinforcing connecting rod 16 is welded between the left load-bearing rod 9 and the outer sleeve 1. The right load-bearing rod 10 is welded to the inner sliding rod 2, and a right reinforcing connecting rod 17 is welded between the right load-bearing rod 10 and the inner sliding rod 2. This ensures the reliability of the connection between the outer sleeve and the left load-bearing rod, and between the inner sliding rod and the right load-bearing rod, enhances the structural strength, and ensures successful hoisting and installation.

[0056] Example 3, prefabricated steel bridge installation method, includes the following steps:

[0057] S1. Production and acceptance of prefabricated components: The steel bridge truss segments are prefabricated in the factory. The connection parts, connecting plates and the ends of the members at the ends of the truss are drilled and processed according to the design requirements. Before leaving the factory, the dimensional accuracy is inspected and the friction surface is treated to ensure that the dimensional deviation and the anti-slip coefficient of the friction surface meet the design requirements.

[0058] S2. On-site truss segment hoisting and positioning: The hoisting system is used to hoist the prefabricated steel bridge truss segments to the design position and guide adjacent truss segments to accurately connect, so that the connection part of the two truss segments is aligned and overlapped with the connecting plate, and the truss elevation, axis and plane position are adjusted to meet the installation accuracy requirements;

[0059] S3. Installation of connecting parts and connecting plates: Place the connecting plate at the connection position of the two-segment truss end connection, adjust the position of the connecting plate to ensure that the bolt holes of the connecting plate are precisely aligned with the bolt holes of the connecting part; for the connection of the end of the member, align the bolt holes of the connecting plate at the end of the member with the bolt holes of the connecting part one by one to ensure that the axis of each bolt hole coincides; S4. Insertion and initial tightening of high-strength bolts: Insert the high-strength bolt connection pair from one side of the connecting plate, install the nut and washer, and take the initial tightening torque as 50% of the final tightening torque value. After the initial tightening is completed, check by tapping and mark the initial tightening line;

[0060] S5. Final tightening and torque check: After the initial tightening is completed, perform the final tightening according to the torque corresponding to the design preload.

[0061] S6. Anti-corrosion treatment: After the connection is completed, apply anti-corrosion coating to the exposed surfaces of bolts, nuts, connecting plates, connecting parts and truss connection parts to complete the truss connection construction.

[0062] The prefabricated steel bridge hoisting and connection system of the present invention has a left support plate and a left support plate respectively used to support two sets of straight rods of the steel bridge truss unit. The anti-fall safety belt goes around from below the steel bridge truss unit to assist in lifting the steel bridge truss unit. If the steel bridge truss unit detaches from the left support plate and the left support plate and falls accidentally, the anti-fall safety belt can effectively prevent the steel bridge truss unit from falling further, reducing construction risks and ensuring stable operation of hoisting.

[0063] The prefabricated steel bridge hoisting and connection system of the present invention has an outer tube and an inner sliding rod forming a telescopic structure, which can adjust the spacing between the left and right load-bearing hangers according to the width of the steel bridge truss unit to adapt to steel bridge truss units of different widths.

[0064] In the prefabricated steel bridge hoisting connection system of the present invention, the other end of the anti-fall safety strap passes under the steel bridge truss unit and then passes through the strap slot. Part of the anti-fall safety strap is wrapped around the strap winding shaft to tighten the anti-fall safety strap. The tightened anti-fall safety strap is used to assist in lifting the steel bridge truss unit and can also limit the left and right load-bearing booms from moving away from each other, ensuring the reliability of hoisting.

[0065] The prefabricated steel bridge hoisting and connection system of the present invention smoothly hoists the first and second steel bridge truss units to the designed installation position, adjusts the two truss segments to precisely approach each other, so that the first connection part and the second connection part correspond and fit together, and completes the initial docking and positioning of the truss segments, providing a foundation for subsequent high-strength bolt fastening and overall forming.

[0066] The prefabricated steel bridge hoisting connection system of this invention uses two sets of parallel straight bars supporting the steel bridge truss unit through a left support plate and a right support plate, and a fall-prevention safety strap that passes under the truss to achieve dual load-bearing. When the truss accidentally detaches from the support plate, the fall-prevention safety strap can directly prevent the truss from falling, fundamentally solving the safety hazard of traditional hoisting equipment without fall protection and ensuring the stable operation of high-altitude hoisting operations.

[0067] The prefabricated steel bridge hoisting and connection system of the present invention has a sliding telescopic main structure composed of an outer sleeve and an inner sliding rod. The distance between the left and right load-bearing hangers can be flexibly adjusted according to the width of steel bridge truss units of different specifications. It can adapt to the hoisting of prefabricated steel bridge trusses of multiple spans and sizes without changing tooling, thereby reducing the cost of construction equipment.

[0068] The prefabricated steel bridge hoisting and connection system of the present invention adopts a locking structure of wrapping shaft and anti-rotation insert for the fall protection safety belt, which can quickly complete the installation, tightening and locking of the belt; after hoisting, the belt can be unlocked by removing the thrust baffle and the insert fixing frame. The on-site installation and disassembly process is simple, shortening the hoisting preparation and finishing time.

[0069] The prefabricated steel bridge installation method described in this invention adopts a construction mode of factory prefabrication and on-site high-strength bolt connection. Through the process of precise alignment of the connecting parts and connecting plates, and symmetrical initial and final tightening of bolt groups from the center to the periphery, the connection surfaces of the truss segments are ensured to fit tightly and the bolts are subjected to uniform stress, thereby improving the overall connection rigidity and structural stability of the steel bridge. With the quick disassembly and hoisting tooling of this invention, the installation time of a single truss segment can be shortened, and the overall construction progress can be accelerated.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0071] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A prefabricated steel bridge hoisting and connection system, characterized in that, It includes a first steel bridge truss unit and a second steel bridge truss unit arranged adjacent to each other. The first steel bridge truss unit is provided with a first connecting part, and the second steel bridge truss unit is provided with a second connecting part. It also includes a hoisting system for hoisting and guiding the first steel bridge truss unit and the second steel bridge truss unit to dock.

2. The prefabricated steel bridge hoisting and connection system according to claim 1, characterized in that, The lifting system is equipped with a steel structure bridge lifting device at its execution end. The steel structure bridge lifting device includes an outer tube, an inner sliding rod, and a lifting connection mechanism. One end of the inner sliding rod is inserted into the outer tube and slides in cooperation with the inner wall of the outer tube. A vertical left load-bearing rod is fixed to the outer end of the outer tube. A left support plate is vertically installed at the bottom end of the left load-bearing rod. A vertical right load-bearing rod is vertically installed at the outer end of the inner sliding rod. A right support plate is installed at the bottom end of the right load-bearing rod. The system also includes a fall protection safety strap. One end of the fall protection safety strap is fixed to the left load-bearing rod, and the other end of the fall protection safety strap is detachably installed on the right load-bearing rod.

3. The prefabricated steel bridge hoisting and connection system according to claim 1, characterized in that, The lifting connection mechanism includes a left hinged support seat on the outer sleeve and a right hinged support seat on the inner slide rod. It also includes a left connecting rod and a right connecting rod arranged symmetrically. The bottom end of the left connecting rod is hinged to the left hinged support seat, and the bottom end of the right connecting rod is hinged to the right hinged support seat. The other ends of the left and right connecting rods are both hinged to the main lifting seat. The main lifting seat is provided with a main lifting lug for connecting to the lifting equipment.

4. The prefabricated steel bridge hoisting and connection system according to claim 1 or 2, characterized in that, The fall arrestor strap is a nylon flat strap.

5. The prefabricated steel bridge hoisting and connection system according to claim 3, characterized in that, One end of the fall arrest safety strap is wound around the fall arrest safety strap flexible winder on the right load-bearing boom.

6. The prefabricated steel bridge hoisting and connection system according to claim 4, characterized in that, The fall arrestor safety harness includes a left clamping arm and a right clamping arm arranged parallel to each other and spaced apart. Both the left and right clamping arms are welded to the right load-bearing boom. It also includes a winding shaft that passes through the left and right clamping arms. One end of the winding shaft passes through the left clamping arm and is connected to a first anti-rotation device on the outer wall of the left clamping arm. A non-through-end slot is provided along the length of the winding shaft. The first anti-rotation device includes an anti-rotation insert that mates with the slot. The anti-rotation insert is installed on the insert fixing frame, which is installed on the left clamping arm by fixing bolt A. The anti-rotation insert is inserted into the threading slot at the end of the wrapping shaft. A thrust baffle is installed on the right clamping arm by fixing bolt B. The wrapping shaft is located between the insert fixing frame and the thrust baffle. The inner side of the thrust baffle abuts against the end of the wrapping shaft. The end of the fall-prevention safety strap passes through the threading slot, and part of the fall-prevention safety strap is wrapped around the wrapping shaft.

7. The prefabricated steel bridge hoisting and connection system according to claim 5, characterized in that, Both the left and right load-bearing booms are equipped with reversing wheels at their bottom ends, and the fall arrestor safety straps pass over their respective outer sides. This prevents the fall arrestor safety straps from contacting the left and right load-bearing booms, thus avoiding excessive wear on the safety straps.

8. The prefabricated steel bridge hoisting and connection system according to claim 6, characterized in that, The left support plate and its upper surface are respectively welded to a left reinforcing rib plate and a right reinforcing rib plate. The left and right reinforcing rib plates are triangular structures. The left and right reinforcing rib plates are respectively welded to the left and right load-bearing hangers.

9. The prefabricated steel bridge hoisting and connection system according to claim 7, characterized in that, The outer tube, inner slide rod, left load-bearing hanger, and right load-bearing hanger are all hollow rectangular steel tube structures. The left load-bearing hanger is welded to the outer tube, and a left reinforcing connecting rod is welded between the left load-bearing hanger and the outer tube. The right load-bearing hanger is welded to the inner slide rod, and a right reinforcing connecting rod is welded between the right load-bearing hanger and the inner slide rod.

10. A method for installing prefabricated steel bridges, characterized in that, Includes the following steps, S1. Production and acceptance of prefabricated components: The steel bridge truss segments are prefabricated in the factory. The connection parts, connecting plates and the ends of the members at the ends of the truss are drilled and processed according to the design requirements. Before leaving the factory, the dimensional accuracy is inspected and the friction surface is treated to ensure that the dimensional deviation and the anti-slip coefficient of the friction surface meet the design requirements. S2. On-site truss segment hoisting and positioning: The hoisting system is used to hoist the prefabricated steel bridge truss segments to the design position and guide adjacent truss segments to accurately connect, so that the connection part of the two truss segments is aligned and overlapped with the connecting plate, and the truss elevation, axis and plane position are adjusted to meet the installation accuracy requirements; S3. Installation of connecting parts and connecting plates: Place the connecting plate at the connection position of the two-segment truss end connection, adjust the position of the connecting plate to ensure that the bolt holes of the connecting plate are precisely aligned with the bolt holes of the connecting part; for the connection of the end of the member, align the bolt holes of the connecting plate at the end of the member with the bolt holes of the connecting part one by one to ensure that the axis of each bolt hole coincides; S4. Insertion and initial tightening of high-strength bolts: Insert the high-strength bolt connection pair from one side of the connecting plate, install the nut and washer, and take the initial tightening torque as 50% of the final tightening torque value. After the initial tightening is completed, check by tapping and mark the initial tightening line; S5. Final tightening and torque check: After the initial tightening is completed, perform the final tightening according to the torque corresponding to the design preload. S6. Anti-corrosion treatment: After the connection is completed, apply anti-corrosion coating to the exposed surfaces of bolts, nuts, connecting plates, connecting parts and truss connection parts to complete the truss connection construction.

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