A method for jacking construction of prefabricated steel structure bridges

Abstract

This invention discloses a method for jacking construction of prefabricated steel structure bridges, comprising the following steps: 1. Erecting temporary support devices; 2. Installing jacking devices; 3. Erecting jacking limiting devices; 4. Lifting and jacking operation of steel structure bridge units; 5. Lowering and unloading the beams. The invention features a clever and reasonable structural design. The jacking limiting devices correct and limit the deviation of both sides of the steel structure bridge during the jacking process, improving stability and safety during construction and ensuring construction quality. Simultaneously, the jacking limiting plate is connected to the jacks through an inclined adjustment mechanism, allowing the tilt angle of the jacking limiting plate to be adaptively adjusted. This adapts to steel structure bridge side plates with different inclination surfaces, ensuring the accuracy of deviation correction on the sides of the steel structure bridge, expanding the applicability of the device, and further facilitating the jacking construction of steel structure bridges.

Description

Technical Field

[0001] This invention belongs to the field of steel structure bridge construction technology, specifically relating to a method for jacking construction of prefabricated steel structure bridges. Background Technology

[0002] A steel bridge is a bridge whose main load-bearing structure is made of steel. In the construction of steel bridge beams, the incremental launching method is often used. However, due to architectural requirements, surrounding buildings, and terrain, steel bridges are often built in curved shapes. When using the traditional incremental launching method for curved steel bridges, the piers can easily obstruct the bridge. The incremental launching work relies solely on small-scale lateral corrections by the launching equipment, requiring constant adjustments during the launching process, significantly reducing construction efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a technical solution for the jacking construction method of prefabricated steel structure bridges, addressing the shortcomings of existing technologies. The invention features a clever and reasonable structural design. A jacking limiting device corrects and limits the deviation of both sides of the steel structure bridge during the jacking process, improving stability and safety during construction and ensuring construction quality. Simultaneously, the jacking limiting plate is connected to the jacks via an inclined adjustment mechanism, allowing for adaptive adjustment of the jacking limiting plate's tilt angle. This adapts to different inclined surfaces of the steel structure bridge side panels, ensuring accurate correction of the steel structure bridge sides, expanding the applicability of the device, and further facilitating the jacking construction of steel structure bridges.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A method for jacking construction of prefabricated steel structure bridges includes the following steps:

[0006] Step 1: Erect temporary support devices according to the construction drawings;

[0007] Step 2: Install the jacking device on the temporary support structure according to the construction drawings:

[0008] (1) The jacking device includes a pad assembly, a walking jacking device, a contact longitudinal beam and an angle adjustment assembly. The pad assembly is composed of several pad units connected by bolts. The design is ingenious and reasonable, and the assembly is convenient. The actual assembly height of the pad assembly at different installation positions can be selected according to the requirements to meet different design requirements.

[0009] (2) Assemble the pad assembly according to the construction drawings, and then weld and fix the pad assembly at the set position of the temporary support device;

[0010] (3) Place the walking jack on the pad assembly, ensuring that the four jack support feet at the bottom of the walking jack are supported on a pad assembly respectively;

[0011] (4) Install the angle adjustment component at the set position of the contact longitudinal beam. The angle adjustment component includes a base and a support panel. The support panel is hinged on the base. Weld the base to the contact longitudinal beam and then place the contact longitudinal beam with the angle adjustment component installed on it onto the walking jacking device. Since the support panel and the base are hinged, under the gravity of the steel structure bridge, the support panel can adapt to the bottom surface of the steel structure bridge, ensuring the contact area between the support panel and the steel structure bridge. This allows the support panel to be suitable for supporting steel structure bridges with different bottom angles, avoiding the phenomenon of detachment during the jacking process of the steel structure bridge, and improving the safety and reliability of the jacking device during the jacking operation of the steel structure bridge.

[0012] (5) Install auxiliary supports on both sides of the walking jacking device and install the auxiliary supports at the set position of the temporary support device; the design is ingenious and reasonable, and the auxiliary supports are used for the initial placement support when hoisting steel structure bridges;

[0013] Step 3: Install jacking and limiting devices at both ends of the temporary support structure according to the construction drawings.

[0014] (1) The jacking limit device includes a mounting base, a jack, an inclined plane adjustment mechanism and a jacking limit plate. The mounting base includes a limit plate one, a limit plate two and a vertical support plate.

[0015] (2) Weld and fix the first limiting plate and the second limiting plate to the set position of the temporary support device. A slot is formed between the first limiting plate and the second limiting plate. Insert the vertical support plate into the slot. The design is ingenious and reasonable. The first limiting plate and the second limiting plate are fixed by welding to ensure the installation is firm. The slot is formed between the first limiting plate and the second limiting plate to realize the insertion and limiting of the jack, making the installation and disassembly of the jack more convenient.

[0016] (3) Weld two positioning beams to the set position of the temporary support device, and then weld positioning longitudinal beams on the two positioning beams. The width of the positioning longitudinal beams matches the size of the jack. Then weld limiting H-beams on both sides of the positioning longitudinal beams so that a placement cavity is formed between the limiting H-beams and the positioning longitudinal beams. The positioning longitudinal beams support and reinforce the bottom of the jacks, and the limiting H-beams limit and stabilize the jacks from both sides. Then, the vertical support plate supports the rear end of the jacks, making the installation of the jacks more stable and reliable, effectively preventing the jacks from shifting during the pushing process, ensuring the accuracy of the correction, and guaranteeing the construction quality.

[0017] (4) Install the inclined plane adjustment mechanism, connect the inclined plane adjustment mechanism between the jack and the top pressure limiting plate, then place the jack into the placement groove cavity, and press the tail end of the jack against the vertical support plate; the inclined plane adjustment mechanism connects the jack and the top pressure limiting plate so that the tilt angle of the top pressure limiting plate can be adjusted adaptively, thereby adapting to the side plates of steel structure bridges with different tilt surfaces, ensuring the accuracy of the correction of the side of the steel structure bridge, and expanding the applicability of the device;

[0018] Step 4: Hoist the steel structure bridge unit into place. The steel structure bridge unit is supported and placed on the auxiliary support. After the steel structure bridge unit is hoisted into place, install the double guide beam at the end of the steel structure bridge unit.

[0019] Step 5: The walking jacking device is activated, lifting upwards to gradually move the contact longitudinal beam. The contact longitudinal beam drives the angle adjustment component above to move upwards simultaneously and contact the steel structure bridge unit. The device continues to lift, disengaging the steel structure bridge unit from the auxiliary support. The walking jacking device then pushes the steel structure bridge unit forward. Simultaneously, the jacking limiting device guides and limits the displacement of the steel structure bridge unit on both sides. The jacking limiting plate contacts and limits the side of the steel structure bridge unit until it is pushed to the predetermined position. Throughout the jacking process, the jacking limiting device continuously corrects and limits the movement of the steel structure bridge unit on both sides, improving stability and safety during construction and ensuring construction quality.

[0020] Step 6: Hoist another steel bridge section and perform the jacking operation on that steel bridge section until the steel bridge is completely jacked up.

[0021] Step 7: Lowering the beam. Gradually disassemble and install the jacking limit device and the jacking device to lower the steel structure bridge onto the pier supports. During unloading, unload the jacking device and the jacking device in sequence to effectively prevent the structure from deflecting too much, which could even lead to structural collapse in severe cases, thereby effectively improving operational safety and reliability.

[0022] Furthermore, in step (5) of step two above, the installation steps of the auxiliary support are as follows:

[0023] a. The auxiliary support includes, from bottom to top, a pad assembly, a height adjustment support, and an angle adjustment assembly. The pad assembly is assembled according to the design requirements and then welded and fixed to the set position of the temporary support device.

[0024] b. Assemble the height-adjustable support according to the design requirements. The height-adjustable support includes support bodies distributed vertically. One end face of the support body is a horizontal panel, and the other end face of the support body is an inclined panel. There is an elongated hole 1 on the side of the support body and an elongated hole 2 on the inclined panel. Install the liner on the two support bodies and weld the liner to the horizontal panel. Then stack the two support bodies vertically, with the inclined panel of the upper support body fitting against the inclined panel of the lower support body. Then connect the upper and lower support bodies through the elongated hole 1 and the elongated hole 2 with tie bolts.

[0025] c. Install and fix the height adjustment bracket to the pad assembly using bolts. Connect and fix the liner of the lower support body to the pad assembly using bolts. Then install the angle adjustment assembly onto the height adjustment bracket. Connect and fix the liner of the upper support body to the base of the angle adjustment assembly using bolts. The height adjustment bracket, pad assembly, and angle adjustment assembly are all fixed by bolts, which makes installation and disassembly convenient and facilitates subsequent unloading work.

[0026] d. Adjust the height adjustment support according to the design requirements, loosen the tie bolts, and slide the upper support body diagonally on the lower support body until the height of the upper support body is adjusted to the correct position. Tighten the tie bolts so that, in the initial unlifted state of the walking jacking device, the top surface height of the support panel in the angle adjustment component above the walking jacking device is lower than the top surface height of the support panel in the angle adjustment component on the auxiliary support. The design is reasonable. The height adjustment support allows for further fine-tuning of the overall height of the auxiliary support, ensuring that, in the initial state, the support panel in the angle adjustment component on the auxiliary support is higher than the support panel in the angle adjustment component on the walking jacking device. This facilitates the initial hoisting and support placement of the steel structure bridge unit and makes subsequent jacking operations of the walking jacking device on the steel structure bridge easier.

[0027] Furthermore, in step four above, the installation steps between the compound guide beam and the steel structure bridge unit are as follows:

[0028] (1) The double guide beam includes a tail standard section, a middle standard section and an end standard section. The tail standard section includes a tail left flange plate, a tail right flange plate and a middle truss one. The middle standard section includes a middle left flange plate, a middle right flange plate and a middle truss two. The end standard sections all include an end left flange plate, an end right flange plate and a middle truss three.

[0029] (2) According to the design requirements, two positioning parts are welded to the end of the steel structure bridge unit. The positioning parts include two fixing plates and several tightening screws. The fixing plates are welded to the steel structure bridge unit, and stiffening plates are welded at the connection between the fixing plates and the steel structure bridge unit. The stiffening plates improve the connection between the fixing plates and the steel structure bridge unit, making the structure more stable. Then, the tightening screws are installed through the fixing plates, and clamping nuts are screwed into both ends of the tightening screws. The clamping and fixing of the two clamping nuts effectively ensures the installation of the tightening screws on the fixing plates. This fixing method also facilitates the adjustment of the position of the tightening screws, so that the tightening screws can be adjusted according to the size of the tail standard section, thereby achieving the accurate positioning of the tail standard section and expanding the scope of application. Multiple tightening screws can be set on each fixing plate, and preferably, the several tightening screws on the two fixing plates are symmetrically distributed. Through the adjustment and coordination of multiple sets of tightening screws, the formation of the limiting gap is more stable, which is more conducive to the accurate insertion and positioning of the limiting part in the limiting gap.

[0030] (3) According to the design requirements, limit components are welded on the left and right tail flanges. The limit components are limit plates. The limit plates are welded to the designed positions of the left and right tail flanges. Reinforcing plates are also provided between the limit plates and the left and right tail flanges to effectively improve the connection strength between the limit plates and the corresponding flanges. The part of the limit plate extending out of the left and right tail flanges is the limit part. The limit plate is welded and fixed to the tail standard section to ensure the installation firmness and reliability of the limit components. The part of the limit plate extending out of the tail standard section is the limit part. It cooperates with the limit gap on the positioning component to achieve accurate positioning of the tail standard section, which is more convenient for actual installation and positioning.

[0031] (4) Adjust the limiting gap between the tightening screws on the two fixing plates of the positioning component according to the design requirements. Then, hoist the left tail flange plate and the right tail flange plate in sequence, and adjust the position of the left tail flange plate and the right tail flange plate so that the limiting part corresponds to the limiting gap on the corresponding positioning component. The limiting part is inserted into the limiting gap to achieve accurate positioning between the left tail flange plate, the right tail flange plate and the steel structure bridge.

[0032] (5) Weld and fix the limiting part to the steel structure bridge unit, and weld and fix the connection between the left and right tail flange plates and the steel structure bridge unit. Then hoist the middle truss one, adjust the position of the middle truss one, and connect and fix the two ends of the middle truss one to the left and right tail flange plates respectively through the bolt assembly.

[0033] (6) Connect the middle standard section and the tail standard section;

[0034] (7) Connect the end standard section and the middle standard section.

[0035] The double guide beam is designed to consist of three standard sections: a tail section, a middle section, and an end section. During actual installation, it can be hoisted and installed in sections according to the available operating space. This design facilitates assembly and has a wide range of applications. When assembling the tail section with the steel structure bridge unit, the tail section is precisely positioned using the cooperation of limiting and positioning components. At the same time, the middle and end sections are hoisted and positioned using a lower limiting device, thus achieving precise positioning of the entire guide beam. This results in a more reasonable stress distribution on the guide beam and greatly improves the actual construction efficiency.

[0036] The tail section consists of three parts: the left tail flange, the right tail flange, and the central truss. During assembly, the left and right tail flanges are first hoisted and spliced. These flanges are then precisely positioned with the steel bridge structure using limiting and positioning devices, followed by welding to ensure the robustness of the double guide beam installation and the reasonable stress distribution on the double guide beam. The central truss is then installed, and it is bolted to the left and right tail flanges, facilitating easy and simple installation and disassembly, thus improving construction efficiency. Lower limiting devices are installed on both the left and right tail flanges to ensure precise positioning between the central and tail flanges, and between the central and tail flanges, enhancing the structural safety of the assembled components.

[0037] Furthermore, in step (6) of the installation process between the aforementioned double guide beam and the steel structure bridge, the connection steps between the middle standard section and the tail standard section are as follows:

[0038] a. A lower limit device is provided at the lower part of the left and right tail flanges. The lower limit device includes a base plate, a U-shaped frame and a positioning bolt. The U-shaped frame is welded and fixed to the base plate to form a limit frame. A reinforcing rib is also welded between the base plate and the U-shaped frame to make the entire lower limit device structure more robust and reliable. The limit frame is welded and fixed to the left and right tail flanges. A positioning groove is formed between the limit frame and the left or right tail flange. The positioning bolt passes through the U-shaped frame and is fixed to the U-shaped frame by a fastening nut. One end of the positioning bolt extends into the positioning groove.

[0039] b. Adjust the lower limit devices on the left and right tail flanges according to the design requirements, adjust the length of the positioning bolts extending into the positioning grooves, and form a placement gap between the extended end of the positioning bolts and the positioning grooves. Then, hoist the left and right middle flanges in sequence, and adjust the positions of the left and right middle flanges so that the bottom of the left flange is exactly engaged in the placement gap of the lower limit device of the left tail flange, and the bottom of the right middle flange is exactly engaged in the placement gap of the lower limit device of the right tail flange. This achieves precise positioning between the left and right middle flanges and the left and right tail flanges, and between the right and right middle flanges. Finally, connect and fix the left and right middle flanges and the right and right tail flanges using bolt assemblies.

[0040] c. Hoist the second middle truss, adjust its position, and connect and fix both ends of the second middle truss to the left and right flanges of the middle section respectively using bolt assemblies.

[0041] The central standard section is divided into three parts: the central left flange plate, the central right flange plate, and the central truss II. During actual assembly, the central left flange plate and the central right flange plate are hoisted and spliced ​​first, and then the central truss II is installed. The central truss II is connected to the central left flange plate and the central right flange plate by bolts. The central left flange plate is also connected to the tail left flange plate, and the central right flange plate is connected to the tail right flange plate by bolts. The installation and disassembly are convenient and simple, and the components can be disassembled and reused. At the same time, it greatly improves the construction efficiency. Lower limit devices are set on the central left flange plate and the central right flange plate to facilitate the precise positioning of the end left flange plate and the central left flange plate, and the end right flange plate and the central right flange plate, thereby improving the structural safety performance of the assembled components.

[0042] Furthermore, in step (7) of the installation process between the aforementioned double guide beam and the steel structure bridge, the connection steps between the end standard section and the middle standard section are as follows:

[0043] a. Lower limit devices are provided at the lower part of the middle left flange plate and the middle right flange plate. The limit frame in the lower limit device is welded and fixed to the middle left flange plate and the middle right flange plate. A positioning groove is formed between the limit frame and the middle left flange plate or the middle right flange plate. Adjust the lower limit device on the middle left flange plate and the middle right flange plate to adjust the length of the positioning bolt extending into the positioning groove. A placement gap is formed between the end of the extension of the positioning bolt and the positioning groove.

[0044] b. Sequentially hoist the left end flange plate and the right end flange plate, and adjust their positions so that the bottom of the left end flange plate is precisely engaged in the placement gap of the lower limit device of the middle left flange plate, and the bottom of the right end flange plate is precisely engaged in the placement gap of the lower limit device of the middle right flange plate, thus achieving precise positioning between the left end flange plate and the middle left flange plate, and between the right end flange plate and the middle right flange plate. Then, use bolt assemblies to connect and fix the left end flange plate and the middle left flange plate, and the right end flange plate and the middle right flange plate.

[0045] c. Hoist the middle truss three, adjust the position of the middle truss three, and connect and fix the two ends of the middle truss three to the left end flange plate and the right end flange plate respectively through the bolt assembly.

[0046] The end standard section consists of three parts: the left end flange plate, the right end flange plate, and the middle truss. In actual assembly, the left end flange plate and the right end flange plate are hoisted and assembled first, and then the middle truss is installed. The middle truss is connected to the left end flange plate and the right end flange plate by bolts. The left end flange plate is also connected to the left middle flange plate, and the right end flange plate is connected to the right middle flange plate by bolts. The installation and disassembly are convenient and simple, and the components can be disassembled and reused, which also greatly improves the construction efficiency.

[0047] Simultaneously, a lower limit device is used to hoist and position the middle and end standard sections, achieving precise positioning of the entire compound guide beam. The structure of the lower limit device is designed as a base plate, a U-shaped frame, and positioning bolts. The U-shaped frame is welded to the base plate to form a limit frame, which is then welded and fixed to the corresponding standard section, creating a positioning groove within the limit frame. This positioning groove is used for the subsequent hoisting and positioning of the standard section. The design of the positioning bolts also allows for adjustment of the spacing within the positioning groove, thus accommodating the hoisting and positioning of standard sections of different sizes and expanding the applicability. Preferably, several positioning bolts are provided, and the positioning adjustment through multiple positioning bolts ensures precise adjustment. After the standard section is positioned and inserted into the positioning groove, multiple positioning bolts can simultaneously tighten and fix the bottom of the standard section. Combined with the bolt fixing between standard sections, this effectively improves the connection firmness and stability after splicing.

[0048] Furthermore, in step three above, the jacking and limiting device also includes an expansion assembly. The expansion assembly is installed after the jack is in place, following these steps:

[0049] a. A face-expanding component is installed at the top of each jack. The face-expanding component includes an expansion panel and a movable adjustment seat. There are two movable adjustment seats. An adjustment screw is installed on the movable adjustment seat. A slider and a support block are installed on the adjustment screw. Limit nuts are installed on both sides of the slider and both sides of the support block.

[0050] b. Set the two movable adjustment seats symmetrically on both sides of the jack. Weld the movable adjustment seats to the positioning beam and fix them. Then install the expansion panel between the corresponding two movable adjustment seats. The collar on the bottom of the expansion panel is connected to the corresponding support block through the connecting screw. The expansion panel and the support block are rotated and hinged.

[0051] c. Connect a support rod to the lifting lug on the back of the expansion panel, then connect the other end of the support rod to the turnbuckle, and connect the turnbuckle to the slider.

[0052] Furthermore, in step (4) of step three above, the installation steps of the inclined plane adjustment mechanism are as follows:

[0053] a. The inclined plane adjustment mechanism includes a support plate and an elastic component. The support plate is welded to the end of the jack. The elastic component includes an adjusting screw and a compression spring. The compression spring includes a compression spring and limiting plates fixed at both ends of the compression spring. The design of the limiting plates can increase the contact area between the two ends of the subsequent compression spring and the support plate and the head of the adjusting screw, ensuring structural stability and reliability. In addition, the limiting plates can play an auxiliary guiding role in the subsequent compression deformation of the compression spring, ensuring the stability and perpendicularity of the compression spring during compression deformation.

[0054] b. Hinge the head of the adjusting screw rod with the top pressure limiting plate, put the compression spring on the adjusting screw rod, and then put the adjusting screw rod through the support plate so that the compression spring is precisely limited and compressed between the support plate and the head of the adjusting screw rod. Screw the limiting nut into the tail of the adjusting screw rod. The limiting nut prevents the adjusting screw rod from falling off the support plate, ensuring structural stability and reliability.

[0055] The overall structural design is ingenious and reasonable, and easy to assemble. The inclined plane adjustment mechanism has multiple elastic components, which are symmetrically arranged in two groups, each group including at least two elastic components. The different compression lengths of the upper and lower groups of elastic components can adjust the lateral angle of the top pressure limiting plate, so that the top pressure limiting plate can be used to correct and limit the side plates of steel structure bridges with different inclination surfaces, fully fit, ensure the actual correction accuracy, and improve the applicability of the inclined plane adjustment mechanism.

[0056] Furthermore, in step one above, the temporary support device includes a temporary bracket and a raised platform. There are two temporary brackets and two raised platforms. The raised platform is horizontally set on the two raised platforms and the two raised platforms are symmetrically distributed. The raised platform includes a first longitudinal beam, a block assembly, and a second longitudinal beam. The first longitudinal beam is welded and fixed to the temporary bracket. The block assembly is assembled according to the design requirements. Several block assemblies are welded and fixed at the set positions of the first longitudinal beam. Then, the second longitudinal beam is welded and fixed to several block assemblies to ensure that the first longitudinal beam and the second longitudinal beam are set horizontally and vertically.

[0057] Furthermore, in step (3) of step three above, stiffening ribs are welded and fixed between the limiting H-beam and the positioning longitudinal beam. The design of the stiffening ribs can improve the structural strength of the limiting H-beam, ensure that the limiting H-beam stabilizes the side of the jack, and make the overall structure more robust and reliable.

[0058] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0059] This invention features a clever and reasonable structural design. By using a jacking limiting device to correct and limit the deviation of both sides of the steel structure bridge during the jacking process, it improves the stability and safety of construction and ensures construction quality. At the same time, the jacking limiting plate is connected to the jack through an inclined adjustment mechanism, which allows the tilt angle of the jacking limiting plate to be adaptively adjusted. This makes it suitable for steel structure bridge side plates with different inclination surfaces, ensuring the accuracy of deviation correction on the sides of the steel structure bridge, expanding the applicability of the device, and making it more conducive to the jacking construction operation of steel structure bridges. Furthermore, the structure of the compound guide beam is designed to consist of three standard sections: a tail section, a middle section, and an end section. During actual installation, the sections can be hoisted and installed in place according to the available operating space. This design facilitates assembly and has a wide range of applications. When assembling the tail section with the steel structure bridge unit, the tail section is precisely positioned using the cooperation of limiting and positioning components. Simultaneously, the middle and end standard sections are hoisted and positioned using a lower limiting device, thereby achieving precise positioning of the entire guide beam. This results in a more reasonable stress distribution on the guide beam and significantly improves actual construction efficiency. Attached Figure Description

[0060] The present invention will be further described below with reference to the accompanying drawings:

[0061] Figure 1 This is a schematic diagram of the structure after the web-type guide beam and the steel structure bridge are combined and spliced ​​in this invention;

[0062] Figure 2 for Figure 1 A magnified schematic diagram of the local structure at point I;

[0063] Figure 3 This is a schematic diagram of the installation structure of the positioning component on a steel bridge in this invention;

[0064] Figure 4 for Figure 1 A magnified schematic diagram of the local structure at point II;

[0065] Figure 5 This is a schematic diagram of the central standard section in this invention;

[0066] Figure 6 This is a schematic diagram of the installation structure of the lower limit device on the middle standard section in this invention;

[0067] Figure 7 This is a schematic diagram of the structure forming the gap in the present invention;

[0068] Figure 8 This is a schematic diagram of the installation structure of the jacking and limiting device on the temporary support device in this invention;

[0069] Figure 9 This is a schematic diagram of the push-limiting device in the present invention;

[0070] Figure 10 This is a schematic diagram of the installation structure between the inclined plane adjustment mechanism and the top pressure limiting plate in this invention;

[0071] Figure 11 This is a schematic diagram of the compression spring component in this invention;

[0072] Figure 12 This is a schematic diagram of the state structure of the jacking limiting device during the jacking process of the steel structure bridge in this invention;

[0073] Figure 13 This is a schematic diagram of the installation position structure between the expansion component and the jack in this invention;

[0074] Figure 14 This is a schematic diagram of the temporary support device in this invention;

[0075] Figure 15 This is a schematic diagram of the installation structure of the jacking device on the temporary support device in this invention;

[0076] Figure 16 This is a schematic diagram of the jacking device in the present invention;

[0077] Figure 17 This is a schematic diagram of the height-adjustable support in this invention;

[0078] Figure 18 This is a schematic diagram of the support body in this invention;

[0079] Figure 19 for Figure 18 A structural diagram from another perspective.

[0080] In the diagram: 1-Temporary support device; 2-Pushing device; 3-Padded block assembly; 4-Walking pusher; 5-Contact longitudinal beam; 6-Angle adjustment assembly; 7-Jack support foot; 8-Base; 9-Support panel; 10-Auxiliary bracket; 11-Mounting seat; 12-Jack; 13-Inclined adjustment mechanism; 14-Pushing limit plate; 15-Limit plate one; 16-Limit plate two; 17-Vertical support plate; 18-Stiffening rib plate; 19-Positioning crossbeam; 20-Positioning longitudinal beam 21-Limiting H-beam; 22-Placement cavity; 23-Steel structure bridge unit; 24-Height adjustment support; 25-Support body; 26-Horizontal panel; 27-Inclined panel; 28-Oblong hole one; 29-Oblong hole two; 30-Liner plate; 31-Tie bolt; 32-Tail standard section; 33-Middle standard section; 34-End standard section; 35-Tail left flange plate; 36-Tail right flange plate; 37-Middle truss one; 38-Middle left side Flange plate; 39-Right side flange plate in the middle; 40-Second middle truss in the middle; 41-Left side flange plate at the end; 42-Right side flange plate at the end; 43-Third middle truss in the middle; 44-Positioning component; 45-Fixing plate; 46-Tightening screw; 47-Stretching plate; 48-Clamping nut; 49-Limiting component; 50-Limiting part; 51-Limiting gap; 52-Lower limit device; 53-Base plate; 54-U-shaped frame; 55-Positioning bolt; 56-Limiting frame; 57-Second longitudinal beam; 58-Fastening nut; 59-Placement gap; 60-Expanding assembly; 61-Expanding panel; 62-Moving adjustment seat; 63-Adjusting screw; 64-Slider; 65-Support block; 66-Limit nut; 67-Support rod; 68-Turn bolt; 69-Support plate; 70-Elastic component; 71-Adjusting screw post; 72-Compression spring; 73-Compression spring; 74-Limit plate; 75-Limit nut; 76-Temporary bracket; 77-Elevation frame; 78-Longitudinal beam one. Detailed Implementation

[0081] like Figures 1 to 19 As shown, this invention provides a method for the incremental launching construction of a prefabricated steel structure bridge, comprising the following steps:

[0082] Step 1: Erect temporary support device 1 according to the construction drawings. Temporary support device 1 includes temporary supports 76 and raised supports 77. Two temporary supports 76 and two raised supports 77 are provided. The raised supports 77 are horizontally arranged on the two raised supports 77, which are symmetrically distributed. The raised supports 77 include longitudinal beam 1 78, pad assembly 3 and longitudinal beam 2 57. The longitudinal beam 1 78 is welded and fixed to the temporary supports 76. The pad assembly 3 is composed of several pad units connected by bolts. The pad assembly 3 is assembled according to the design requirements. Several pad assemblies 3 are welded and fixed at the designated positions of longitudinal beam 1 78. Then, longitudinal beam 2 57 is welded and fixed to several pad assemblies 3 to ensure that longitudinal beam 1 78 and longitudinal beam 2 57 are set vertically and horizontally. The raised supports 77 are formed by assembling longitudinal beam 1 78, pad assembly 3 and longitudinal beam 2 57, so that the height of temporary support device 1 can meet the operation and unloading requirements of jacking device 2, and can also meet the structural stability and reliability of temporary support device 1 after erection.

[0083] Step 2: Install the jacking device 2 on the temporary support device 1 according to the construction drawings.

[0084] (1) The jacking device 2 includes a pad assembly 3, a walking jacking device 4, a contact longitudinal beam 5 and an angle adjustment assembly 6. The pad assembly 3 is composed of several pad units connected by bolts. The design is ingenious and reasonable, and the assembly and splicing are convenient. The actual assembly height of the pad assembly 3 at different installation positions can be selected according to the requirements to meet different design requirements.

[0085] (2) Assemble the pad assembly 3 according to the construction drawings, and then weld and fix the pad assembly 3 at the set position of the temporary support device 1.

[0086] (3) Place the walking jack 4 on the pad assembly 3, ensuring that the four jack support feet 7 at the bottom of the walking jack 4 are respectively supported on a pad assembly 3.

[0087] (4) Install the angle adjustment component 6 at the set position of the contact longitudinal beam 5. The angle adjustment component 6 includes a base 8 and a support panel 9. The support panel 9 is hinged on the base 8. Weld the base 8 to the contact longitudinal beam 5 and then place the contact longitudinal beam 5 with the angle adjustment component 6 installed on the walking pusher 4. Since the support panel 9 and the base 8 are hinged, under the gravity of the steel structure bridge, the support panel 9 can adapt to the bottom surface of the steel structure bridge, ensuring the contact area between the support panel 9 and the steel structure bridge. This allows the support panel 9 to be suitable for supporting the steel structure bridge with different bottom angles, avoiding the phenomenon of detachment during the jacking process of the steel structure bridge, and improving the safety and reliability of the jacking device 2 when jacking the steel structure bridge.

[0088] (5) Install auxiliary supports 10 on both sides of the walking jacking device 4 and install the auxiliary supports 10 at the set position of the temporary support device 1; the design is ingenious and reasonable, and the auxiliary supports 10 are used for the initial placement support during the hoisting of steel structure bridges.

[0089] The jacking device 2 is installed on the temporary support 76, while the auxiliary support 10 is installed on the two raised supports 77. The jacking device 2 is equipped with two walking jacks 4, which correspond to the design of the two temporary supports 76 in the temporary support device 1. Each temporary support 76 is equipped with one walking jack 4. The contact longitudinal beam 5 is set on the two walking jacks 4. The jacking force is ensured by jacking simultaneously with the two walking jacks 4.

[0090] The installation steps for the auxiliary bracket 10 are as follows:

[0091] a. The auxiliary support 10 includes a pad assembly 3, a height adjustment support 24 and an angle adjustment assembly 6 arranged sequentially from bottom to top. The pad assembly 3 is assembled according to the design requirements and welded and fixed to the set position of the temporary support device 1.

[0092] b. Assemble the height-adjustable support 24 according to the design requirements. The height-adjustable support 24 includes support bodies 25 distributed vertically. One end face of the support body 25 is a horizontal panel 26, and the other end face of the support body 25 is an inclined panel 27. The side of the support body 25 is provided with an elongated hole 28, and the inclined panel 27 is provided with an elongated hole 29. Install the liner 30 on the two support bodies 25 and weld the liner 30 to the horizontal panel 26. The liner 30 is pre-drilled with through holes to facilitate the bolt connection, thereby facilitating the subsequent installation of the height-adjustable support 24 with the pad assembly 3 and the angle adjustment assembly 6. Then stack the two support bodies 25 vertically, with the inclined panel 27 of the upper support body 25 fitting against the inclined panel 27 of the lower support body 25. Then connect the upper and lower support bodies 25 through the elongated hole 28 and the elongated hole 29 with tie bolts 31.

[0093] c. Install and fix the height adjustment support 24 onto the pad assembly 3 using bolts. Connect and fix the liner 30 of the lower support body 25 to the pad assembly 3 using bolts. Then install the angle adjustment assembly 6 onto the height adjustment support 24. Connect and fix the liner 30 of the upper support body 25 to the base 8 of the angle adjustment assembly 6 using bolts. The height adjustment support 24, the pad assembly 3, and the angle adjustment assembly 6 are all fixed by bolts, which makes installation and disassembly convenient and facilitates subsequent unloading work.

[0094] d. Adjust the height adjustment support 24 according to the design requirements, loosen the tie bolts 31, and slide the upper support body 25 obliquely on the lower support body 25 until the height of the upper support body 25 is adjusted to the correct position. Tighten the tie bolts 31 so that in the initial unlifted state of the walking jacking device 4, the top surface height of the support panel 9 in the angle adjustment component 6 above the walking jacking device 4 is lower than the top surface height of the support panel 9 in the angle adjustment component 6 on the auxiliary support 10. The design is reasonable. The height adjustment support 24 can further fine-tune the overall height of the auxiliary support 10 so that in the initial state, the support panel 9 in the angle adjustment component 6 on the auxiliary support 10 is higher than the support panel 9 in the angle adjustment component 6 on the walking jacking device 4. This facilitates the initial hoisting and support placement of the steel structure bridge unit and makes it easier for the walking jacking device 4 to push the steel structure bridge in the subsequent operation.

[0095] Step 3: Install jacking and limiting devices at both ends of temporary support device 1 according to the construction drawings:

[0096] (1) The jacking limit device includes a mounting base 11, a jack 12, an inclined plane adjustment mechanism 13 and a jacking limit plate 14. The mounting base 11 includes a limit plate one 15, a limit plate two 16 and a vertical support plate 17.

[0097] (2) Weld and fix the first limiting plate 15 and the second limiting plate 16 to the set position of the temporary support device 1. A slot is formed between the first limiting plate 15 and the second limiting plate 16. Insert the vertical support plate 17 into the slot. The design is ingenious and reasonable. The first limiting plate 15 and the second limiting plate 16 are fixed by welding to ensure the installation is firm. The slot is formed between the first limiting plate 15 and the second limiting plate 16 to realize the insertion limit of the jack 12, making the installation and disassembly of the jack 12 more convenient.

[0098] (3) Weld two positioning beams 19 to the designated positions of the temporary support device 1, and then weld positioning longitudinal beams 20 onto the two positioning beams 19. The width of the positioning longitudinal beams 20 matches the size of the jacks 12. Then, weld limiting H-beams 21 to both ends of the positioning longitudinal beams 20, so that a placement cavity 22 is formed between the limiting H-beams 21 and the positioning longitudinal beams 20. The positioning longitudinal beams 20 support and reinforce the bottom of the jacks 12. Preferably, two jacks 12 are provided in each jacking limiting device, and two corresponding positioning longitudinal beams 20 are welded on. The positioning longitudinal beams 20 and the jacks 12 are connected. 2. A one-to-one correspondence setting is adopted. The limiting H-beam 21 limits and stabilizes the jack 12 from both sides, and the rear end of the jack 12 is supported by the vertical support plate 17, which makes the installation of the jack 12 more stable and reliable, effectively preventing the displacement of the jack 12 during the pushing process, ensuring the correction accuracy and guaranteeing the construction quality. The limiting H-beam 21 and the positioning longitudinal beam 20 are welded and fixed with stiffening ribs 18. The design of stiffening ribs 18 can improve the structural strength of the limiting H-beam 21, ensure the limiting H-beam 21 limits and stabilizes the jack 12 from the side, and make the overall structure more solid and reliable.

[0099] (4) Install the inclined plane adjustment mechanism 13, connect the inclined plane adjustment mechanism 13 between the jack 12 and the top pressure limiting plate 14, then place the jack 12 into the placement groove 22, and press the tail end of the jack 12 against the vertical support plate 17; the inclined plane adjustment mechanism 13 connects the jack 12 and the top pressure limiting plate 14, so that the tilt angle of the top pressure limiting plate 14 can be adjusted adaptively, thereby adapting to the side plates of steel structure bridges with different tilt surfaces, ensuring the accuracy of the correction of the side of the steel structure bridge, and expanding the applicability of the device;

[0100] The installation steps for the inclined plane adjustment mechanism 13 are as follows:

[0101] a. The inclined plane adjustment mechanism 13 includes a support plate 69 and an elastic component 70. The support plate 69 is welded to the end of the jack 12. The elastic component 70 includes an adjusting screw 71 and a compression spring 72. The compression spring 72 includes a compression spring 73 and limiting plates 74 fixed at both ends of the compression spring 73. The design of the limiting plates 74 can increase the contact area between the two ends of the compression spring 72 and the support plate 69 and the head of the adjusting screw 71, ensuring structural stability and reliability. In addition, the limiting plates 74 can play an auxiliary guiding role in the compression deformation of the compression spring 73, ensuring the stability and perpendicularity of the compression spring 73 during compression deformation.

[0102] b. Hinge the head of the adjusting screw 71 with the top pressure limiting plate 14, sleeve the compression spring 72 onto the adjusting screw 71, and then pass the adjusting screw 71 onto the support plate 69, so that the compression spring 72 is precisely limited and compressed between the support plate 69 and the head of the adjusting screw, and screw the limiting nut 75 into the tail of the adjusting screw 71; the limiting nut 75 prevents the adjusting screw from falling off the support plate 69, ensuring structural stability and reliability.

[0103] The overall structure is ingeniously and reasonably designed and easy to assemble. The inclined adjustment mechanism 13 has multiple elastic components 70, which are arranged symmetrically in two groups, one above the other. Each group includes at least two elastic components 70, which are symmetrically arranged on the support plate 69. The different compression lengths of the two groups of elastic components 70 can adjust the lateral angle of the top pressure limiting plate 14, so that the top pressure limiting plate 14 can be used to correct and limit the side plates of steel structure bridges with different inclination surfaces, fully fit, ensure the actual correction accuracy, and improve the applicability of the inclined adjustment mechanism 13.

[0104] The jacking and limiting device also includes an expansion assembly 60. After the jack 12 is in place, the expansion assembly 60 is installed, and the steps are as follows:

[0105] a. A face-expanding component 60 is installed at the end of each jack 12. The face-expanding component 60 includes a face-expanding panel 61 and a movable adjustment seat 62. There are two movable adjustment seats 62. An adjustment screw 63 is provided on the movable adjustment seat 62. A slider 64 and a support block 65 are provided on the adjustment screw 63. Limit nuts 66 are provided on both sides of the slider 64 and both sides of the support block 65.

[0106] b. Two movable adjustment seats 62 are symmetrically arranged on both sides of the jack 12. The movable adjustment seats 62 are welded and fixed to the positioning crossbeam 19. Then, the expansion panel 61 is installed between the corresponding two movable adjustment seats 62. The expansion panel 61 is rotatably hinged to the support block 65.

[0107] c. Connect a support rod 67 to the lifting lug on the back of the expanded panel 61, then connect the other end of the support rod 67 to the turnbuckle 68, and connect the turnbuckle 68 to the slider 64.

[0108] The structure is compact and reasonable. The design of the expansion panel 61 can ensure the contact area between the jacking limit device and the side of the steel structure bridge. The expansion panel 61 can also be adaptively adjusted according to the angle of the side of the steel structure bridge. With the design of the inclined adjustment mechanism 13, it can effectively ensure full contact with the side of the steel structure bridge, thereby ensuring the correction and limiting effect of the jacking limit device on the steel structure bridge during the jacking process.

[0109] Step 4: Hoist the steel structure bridge unit 23 into place. The steel structure bridge unit 23 is supported and hoisted onto the auxiliary support 10. After the steel structure bridge unit 23 is hoisted into place, install the double guide beam at the end of the steel structure bridge unit 23.

[0110] The installation steps between the double guide beam and the steel structure bridge unit 23 are as follows:

[0111] (1) The double guide beam includes a tail standard section 32, a middle standard section 33 and an end standard section 34. The tail standard section 32 includes a tail left flange plate 35, a tail right flange plate 36 and a middle truss 37. The middle standard section 33 includes a middle left flange plate 38, a middle right flange plate 39 and a middle truss 40. The end standard sections 34 all include an end left flange plate 41, an end right flange plate 42 and a middle truss 43.

[0112] (2) According to the design requirements, two positioning parts 44 are welded to the ends of the steel structure bridge unit 23. The positioning parts 44 include two fixing plates 45 and several tightening screws 46. The fixing plates 45 are welded to the steel structure bridge unit 23, and stiffening plates 47 are welded at the connection between the fixing plates 45 and the steel structure bridge unit 23. The stiffening plates 47 improve the connection between the fixing plates 45 and the steel structure bridge unit 23, making the structure more stable. Then, the tightening screws 46 are installed through the fixing plates 45, and clamping nuts 48 are screwed into both ends of the tightening screws 46. The structure is fixed by the clamping of the two clamping nuts 48. This effectively ensures the secure installation of the tightening screw 46 on the fixing plate 45, and the fixing method also facilitates the adjustment of the position of the tightening screw 46, so that the tightening screw 46 can be adjusted according to the size of the tail standard section 32, thereby achieving the precise positioning of the tail standard section 32 and expanding the scope of application. Multiple tightening screws 46 can be provided on each fixing plate 45, and preferably, the tightening screws 46 on two fixing plates 45 are symmetrically distributed with each other. Through the adjustment and cooperation of multiple sets of tightening screws 46, the formation of the limiting gap 51 is more stable, which is more conducive to the precise insertion and positioning of the limiting part 50 within the limiting gap 51.

[0113] (3) According to the design requirements, limiters 49 are welded on the left tail flange 35 and the right tail flange 36. The limiters 49 are limiters. The limiters are welded to the designed positions of the left tail flange 35 and the right tail flange 36. A stiffening plate 47 is also provided between the limiters and the left tail flange 35 and the right tail flange 36 to effectively improve the connection strength between the limiters and the corresponding flanges. At the same time, the part of the limiters extending out of the left tail flange 35 and the right tail flange 36 is the limiter part 50. The limiters are welded and fixed to the tail standard section 32 to ensure the installation firmness and reliability of the limiters 49. The part of the limiters extending out of the tail standard section 32 is the limiter part 50, which cooperates with the limit gap 51 on the positioning part 44 to achieve the precise positioning of the tail standard section 32, which is more convenient for actual installation and positioning.

[0114] (4) Adjust the limiting gap 51 between the tightening screws 46 on the two fixing plates 45 of the positioning component 44 according to the design requirements. Then, hoist the tail left flange plate 35 and the tail right flange plate 36 in sequence, and adjust the position of the tail left flange plate 35 and the tail right flange plate 36 so that the limiting part 50 corresponds to the limiting gap 51 on the corresponding positioning component 44. The limiting part 50 is matched and inserted into the limiting gap 51 to achieve precise positioning between the tail left flange plate 35, the tail right flange plate 36 and the steel structure bridge.

[0115] (5) Weld and fix the limiting part 50 to the steel structure bridge unit 23. At the same time, weld and fix the connection between the tail left flange plate 35, the tail right flange plate 36 and the steel structure bridge unit 23. Then hoist the middle truss 37, adjust the position of the middle truss 37, and connect and fix the two ends of the middle truss 37 to the tail left flange plate 35 and the tail right flange plate 36 respectively through the bolt assembly.

[0116] (6) Connect the middle standard section 33 and the tail standard section 32;

[0117] (7) Connect the end standard section 34 and the middle standard section 33.

[0118] The compound guide beam is designed to consist of three standard sections: a tail standard section 32, a middle standard section 33, and an end standard section 34. During actual installation, it can be hoisted and installed in sections according to the available operating space. This design facilitates assembly and has a wide range of applications. When assembling the tail standard section 32 with the steel structure bridge unit 23, the tail standard section 32 is precisely positioned by the cooperation of the limiting component 49 and the positioning component 44. At the same time, the middle standard section 33 and the end standard section 34 are hoisted and positioned by the lower limiting device 52. This ensures the precise positioning of the entire guide beam, making the stress on the guide beam more reasonable and greatly improving the actual construction efficiency.

[0119] The tail section 32 is divided into three parts: the left tail flange 35, the right tail flange 36, and the central truss 37. During actual assembly, the left tail flange 35 and the right tail flange 36 are hoisted and spliced ​​first. The left tail flange 35 and the right tail flange 36 are then precisely positioned with the steel bridge structure using limiting parts 49 and positioning parts 44, and then welded and fixed to ensure the installation firmness between the double guide beam and the steel bridge unit 23, guaranteeing the reasonable stress distribution of the double guide beam. Finally, the installation is completed. The middle truss 37 is installed, and the middle truss 37 is connected to the left rear flange plate 35 and the right rear flange plate 36 by bolts. The installation and disassembly are convenient and simple, which improves the construction efficiency. The lower limit device 52 is set on the left rear flange plate 35 and the right rear flange plate 36 to facilitate the precise positioning between the middle left flange plate 38 and the left rear flange plate 35, and the middle right flange plate 39 and the right rear flange plate 36, thereby improving the structural safety performance of the assembled components.

[0120] The connection steps between the middle standard section 33 and the tail standard section 32 are as follows:

[0121] a. A lower limit device 52 is provided at the lower part of the left tail flange 35 and the right tail flange 36. The lower limit device 52 includes a base plate 53, a U-shaped frame 54 and a positioning bolt 55. The U-shaped frame 54 is welded and fixed to the base plate 53 to form a limit frame 56. A reinforcing rib is also welded between the base plate 53 and the U-shaped frame 54 to make the entire lower limit device 52 structure more robust and reliable. The limit frame 56 is welded and fixed to the left tail flange 35 and the right tail flange 36. A positioning groove is formed between the limit frame 56 and the left tail flange 35 or the right tail flange 36. The positioning bolt 55 passes through the U-shaped frame 54 and is fixed to the U-shaped frame 54 by a fastening nut 58. One end of the positioning bolt 55 extends into the positioning groove.

[0122] b. Adjust the lower limit devices 52 on the left tail flange 35 and the right tail flange 36 according to the design requirements. Adjust the length of the positioning bolt 55 extending into the positioning groove so that a placement gap 59 is formed between the extended end of the positioning bolt 55 and the positioning groove. Then, hoist the middle left flange 38 and the middle right flange 39 in sequence, and adjust the positions of the middle left flange 38 and the middle right flange 39 so that the bottom of the left flange is exactly engaged with the lower limit of the left tail flange 35. The bottom of the middle right flange plate 39 is precisely inserted into the placement gap 59 of the lower limit device 52 of the tail right flange plate 36 within the placement gap 59 of the positioning device 52, thereby achieving precise positioning between the middle left flange plate 38 and the tail left flange plate 35, and between the middle right flange plate 39 and the tail right flange plate 36. Then, the middle left flange plate 38 and the tail left flange plate 35, and between the middle right flange plate 39 and the tail right flange plate 36 are connected and fixed by bolt assembly.

[0123] c. Hoist the middle truss 240, adjust the position of the middle truss 240, and connect and fix the two ends of the middle truss 240 to the middle left flange plate 38 and the middle right flange plate 39 respectively through the bolt assembly.

[0124] The central standard section 33 is divided into three parts: the central left flange plate 38, the central right flange plate 39, and the central truss section 2 40. During actual assembly, the central left flange plate 38 and the central right flange plate 39 are hoisted and spliced ​​first, followed by the installation of the central truss section 2 40. The central truss section 2 40 is connected to the central left flange plate 38 and the central right flange plate 39 using bolts. The central left flange plate 38 is connected to the rear left flange plate 35, and the central right flange plate 39 is connected to... The right wing flanges 36 at the rear are also connected by bolts, which makes installation and disassembly convenient and simple. The components can be disassembled and reused, which also greatly improves construction efficiency. Lower limit devices 52 are set on the left wing flange 38 and the right wing flange 39 in the middle section, so as to facilitate the precise positioning between the left wing flange 41 at the end and the left wing flange 38 in the middle section, and the right wing flange 42 at the end and the right wing flange 39 in the middle section, thereby improving the structural safety performance of the assembled components.

[0125] The connection steps between the end standard section 34 and the middle standard section 33 are as follows:

[0126] a. Lower limit devices 52 are provided at the lower parts of the left wing plate 38 and the right wing plate 39 in the middle section. The limit frame 56 in the lower limit device 52 is welded and fixed to the left wing plate 38 and the right wing plate 39 in the middle section. The limit frame 56 forms a positioning groove between the left wing plate 38 or the right wing plate 39 in the middle section. The lower limit devices 52 on the left wing plate 38 and the right wing plate 39 in the middle section are adjusted to adjust the length of the positioning bolt 55 extending into the positioning groove. The extension end of the positioning bolt 55 forms a placement gap 59 with the positioning groove.

[0127] b. Sequentially hoist the left end flange plate 41 and the right end flange plate 42, and adjust their positions so that the bottom of the left end flange plate 41 is precisely engaged in the placement gap 59 of the lower limit device 52 of the middle left flange plate 38, and the bottom of the right end flange plate 42 is precisely engaged in the placement gap 59 of the lower limit device 52 of the middle right flange plate 39. This achieves precise positioning between the left end flange plate 41 and the middle left flange plate 38, and between the right end flange plate 42 and the middle right flange plate 39. Then, use bolt assemblies to connect and fix the left end flange plate 41 and the middle left flange plate 38, and the right end flange plate 42 and the middle right flange plate 39.

[0128] c. Hoist the middle truss 3 43, adjust the position of the middle truss 3 43, and connect and fix the two ends of the middle truss 3 43 to the left end flange plate 41 and the right end flange plate 42 respectively through the bolt assembly.

[0129] The end standard section 34 includes three parts: the left end flange plate 41, the right end flange plate 42, and the middle truss 43. In actual assembly, the left end flange plate 41 and the right end flange plate 42 are hoisted and assembled first, and then the middle truss 43 is installed. The middle truss 43 is connected to the left end flange plate 41 and the right end flange plate 42 by bolts. The left end flange plate 41 is also connected to the left middle flange plate 38, and the right end flange plate 42 is connected to the right middle flange plate 39 by bolts. The installation and disassembly are convenient and simple, and the components can be disassembled and reused, which also greatly improves the construction efficiency.

[0130] Simultaneously, a lower limit device 52 is used to hoist and position the middle standard section 33 and the end standard section 34, achieving precise positioning of the entire compound guide beam. The structure of the lower limit device 52 is designed as a base plate 53, a U-shaped frame 54, and positioning bolts 55. The U-shaped frame 54 is welded to the base plate 53 to form a limit frame 56. The limit frame 56 is welded and fixed to the standard section, forming a positioning groove inside the limit frame 56. This positioning groove is used for the subsequent hoisting and positioning of the standard section. In addition, the design of the positioning bolts 55 can also adjust the spacing in the positioning groove, thereby adapting to the hoisting and positioning of standard sections of different sizes and expanding the scope of application. Moreover, it is preferable to set several positioning bolts 55. The positioning adjustment of multiple positioning bolts 55 ensures the accuracy of adjustment. After the standard section is positioned and inserted into the positioning groove, multiple positioning bolts 55 can also simultaneously tighten and fix the bottom of the standard section. Combined with the bolt fixing between standard sections, it effectively improves the connection firmness and stability after splicing.

[0131] Step 5: The walking jacking device 4 is activated and rises upward, causing the contact longitudinal beam 5 to gradually move upward. The contact longitudinal beam 5 drives the angle adjustment component 6 above to move upward synchronously and contact the steel structure bridge unit 23. It continues to rise, causing the steel structure bridge unit 23 to disengage from the auxiliary support 10. The walking jacking device 4 then pushes the steel structure bridge unit 23 forward. At the same time, the jacking limiting device limits and guides the steel structure bridge unit 23 on both sides during its displacement process. The jacking limiting plate 14 contacts and limits the side of the steel structure bridge unit 23 until the steel structure bridge unit 23 is pushed to the predetermined position. During the jacking process of the steel structure bridge unit 23, the jacking limiting device always corrects and limits its deviation on both sides, improving the stability and safety of construction and ensuring construction quality.

[0132] Step 6: Hoist another steel structure bridge unit 23 and perform the jacking operation on this steel structure bridge unit 23 until the steel structure bridge is completely jacked up.

[0133] Step 7: Lowering the beam. Gradually disassemble and install the jacking limit device and jacking device 2 to lower the steel structure bridge onto the pier supports. During unloading, gradually unload the jacking device 2 and jacking device 2 to effectively prevent the structure from deflecting too much, which could even lead to structural collapse in severe cases, thereby effectively improving operational safety and reliability.

[0134] This invention features a clever and reasonable structural design. By using a jacking limiting device to correct and limit the deviation of both sides of the steel structure bridge during the jacking process, it improves the stability and safety of construction and ensures construction quality. At the same time, the jacking limiting plate is connected to the jack through an inclined adjustment mechanism, which allows the tilt angle of the jacking limiting plate to be adaptively adjusted. This makes it suitable for steel structure bridge side plates with different inclination surfaces, ensuring the accuracy of deviation correction on the sides of the steel structure bridge, expanding the applicability of the device, and making it more conducive to the jacking construction operation of steel structure bridges. Furthermore, the structure of the compound guide beam is designed to consist of three standard sections: a tail section, a middle section, and an end section. During actual installation, the sections can be hoisted and installed in place according to the available operating space. This design facilitates assembly and has a wide range of applications. When assembling the tail section with the steel structure bridge unit, the tail section is precisely positioned using the cooperation of limiting and positioning components. Simultaneously, the middle and end standard sections are hoisted and positioned using a lower limiting device, thereby achieving precise positioning of the entire guide beam. This results in a more reasonable stress distribution on the guide beam and significantly improves actual construction efficiency.

[0135] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to achieve substantially the same technical effect are all covered within the protection scope of the present invention.

Claims

1. A method for jacking construction of prefabricated steel structure bridges, characterized in that: Includes the following steps: Step 1: Erect temporary support devices according to the construction drawings; Step 2: Install the jacking device on the temporary support structure according to the construction drawings: (1) The jacking device includes a pad assembly, a walking jacking device, a contact longitudinal beam and an angle adjustment assembly. The pad assembly is composed of several pad units connected by bolts. (2) Assemble the pad assembly according to the construction drawings, and then weld and fix the pad assembly at the set position of the temporary support device; (3) Place the walking jack on the pad assembly, ensuring that the four jack support feet at the bottom of the walking jack are supported on a pad assembly respectively; (4) Install the angle adjustment component at the set position of the contact longitudinal beam. The angle adjustment component includes a base and a support panel. The support panel is hinged on the base. Weld the base to the contact longitudinal beam and then place the contact longitudinal beam with the angle adjustment component installed on the walking pusher. (5) Install auxiliary supports on both sides of the walking jacking device and install the auxiliary supports at the set position of the temporary support device; Step 3: Install jacking and limiting devices at both ends of the temporary support structure according to the construction drawings. (1) The jacking limit device includes a mounting base, a jack, an inclined plane adjustment mechanism and a jacking limit plate. The mounting base includes a limit plate one, a limit plate two and a vertical support plate. (2) Weld and fix the first limiting plate and the second limiting plate to the set position of the temporary support device, forming a slot between the first limiting plate and the second limiting plate, and insert the vertical support plate into the slot; (3) Weld two positioning beams to the set position of the temporary support device, and then weld positioning longitudinal beams on the two positioning beams. The width of the positioning longitudinal beams matches the size of the jack. Then weld limiting H-beams on both ends of the positioning longitudinal beams so that a placement groove is formed between the limiting H-beams and the positioning longitudinal beams. (4) Install the inclined plane adjustment mechanism, connect the inclined plane adjustment mechanism between the jack and the top pressure limit plate, then place the jack into the placement groove cavity, and press the tail end of the jack against the vertical support plate. The installation steps for the inclined plane adjustment mechanism are as follows: a. The inclined plane adjustment mechanism includes a support plate and an elastic component. The support plate is welded to the end of the jack. The elastic component includes an adjusting screw and a compression spring. The compression spring includes a compression spring and limiting plates fixed at both ends of the compression spring. b. Hinge the head of the adjusting screw rod with the top pressure limiting plate, sleeve the compression spring onto the adjusting screw rod, and then pass the adjusting screw rod through the support plate so that the compression spring is precisely compressed between the support plate and the head of the adjusting screw rod. Finally, screw the limiting nut into the tail of the adjusting screw rod. Step 4: Hoist the steel structure bridge unit into place. The steel structure bridge unit is supported and placed on the auxiliary support. After the steel structure bridge unit is hoisted into place, install the double guide beam at the end of the steel structure bridge unit. Step 5: The walking jacking device is activated and rises upward, causing the contact longitudinal beam to gradually move upward. The contact longitudinal beam drives the angle adjustment component above to move upward synchronously and contact the steel structure bridge unit. It continues to rise so that the steel structure bridge unit is separated from the auxiliary support. The walking jacking device then pushes the steel structure bridge unit forward. At the same time, the jacking limiting device limits and guides the steel structure bridge unit on both sides during the displacement process. The jacking limiting plate contacts and limits the side of the steel structure bridge unit until the steel structure bridge unit is pushed to the predetermined position. Step 6: Hoist another steel bridge section and perform the jacking operation on that steel bridge section until the steel bridge is completely jacked up. Step 7: Lowering the beam. Gradually disassemble and install the jacking limit device and the jacking device to lower the steel structure bridge onto the pier supports.

2. The method for jacking construction of a prefabricated steel structure bridge according to claim 1, characterized in that: In step (5) of step two above, the installation steps of the auxiliary bracket are as follows: a. The auxiliary support includes, from bottom to top, a pad assembly, a height adjustment support, and an angle adjustment assembly. The pad assembly is assembled according to the design requirements and then welded and fixed to the set position of the temporary support device. b. Assemble the height-adjustable support according to the design requirements. The height-adjustable support includes support bodies distributed vertically. One end face of the support body is a horizontal panel, and the other end face of the support body is an inclined panel. The side of the support body is provided with an elongated hole one, and the inclined panel is provided with an elongated hole two. Install the liner on the two support bodies, weld the liner to the horizontal panel and fix it. Then stack the two support bodies vertically, with the inclined panel of the upper support body fitting against the inclined panel of the lower support body. Then connect the upper and lower support bodies through the elongated hole one and the elongated hole two with tie bolts. c. Install and fix the height adjustment bracket onto the pad assembly using bolts. Connect and fix the liner of the lower support body to the pad assembly using bolts. Then install the angle adjustment assembly onto the height adjustment bracket. Connect and fix the liner of the upper support body to the base of the angle adjustment assembly using bolts. d. Adjust the height adjustment support according to the design requirements, loosen the tie bolts, and slide the upper support body diagonally on the lower support body until the height of the upper support body is adjusted to the correct position. Tighten the tie bolts so that, in the initial unlifted state of the walking jack, the top surface height of the support panel in the angle adjustment assembly above the walking jack is lower than the top surface height of the support panel in the angle adjustment assembly on the auxiliary support.

3. The method for jacking construction of a prefabricated steel structure bridge according to claim 1, characterized in that: In step four above, the installation steps between the compound guide beam and the steel structure bridge unit are as follows: (1) The double guide beam includes a tail standard section, a middle standard section and an end standard section. The tail standard section includes a tail left flange plate, a tail right flange plate and a middle truss one. The middle standard section includes a middle left flange plate, a middle right flange plate and a middle truss two. The end standard sections all include an end left flange plate, an end right flange plate and a middle truss three. (2) According to the design requirements, two positioning parts are welded to the end of the steel structure bridge unit. The positioning parts include two fixing plates and several tightening screws. The fixing plates are welded to the steel structure bridge unit, and stiffening plates are welded at the connection between the fixing plates and the steel structure bridge unit. Then, the tightening screws are installed through the fixing plates, and clamping nuts are screwed into both ends of the tightening screws. (3) According to the design requirements, limiters are welded on the left wing flange and the right wing flange of the tail. The limiters are limit plates. The limit plates are welded at the designed positions of the left wing flange and the right wing flange of the tail. At the same time, the part of the limit plate that extends out of the left wing flange and the right wing flange of the tail is the limit part. (4) Adjust the limiting gap between the tightening screws on the two fixed plates of the positioning part according to the design requirements. Then, hoist the left tail flange plate and the right tail flange plate in sequence, and adjust the position of the left tail flange plate and the right tail flange plate so that the limiting part corresponds to the limiting gap on the corresponding positioning part and the limiting part is inserted into the limiting gap. (5) Weld and fix the limiting part to the steel structure bridge unit, and weld and fix the connection between the left and right tail flange plates and the steel structure bridge unit. Then hoist the middle truss one, adjust the position of the middle truss one, and connect and fix the two ends of the middle truss one to the left and right tail flange plates respectively through the bolt assembly. (6) Connect the middle standard section and the tail standard section; (7) Connect the end standard section and the middle standard section.

4. The method for jacking construction of a prefabricated steel structure bridge according to claim 3, characterized in that: In step (6) of the installation process between the aforementioned double guide beam and the steel structure bridge unit, the connection steps between the middle standard section and the tail standard section are as follows: a. A lower limit device is provided at the lower part of the left and right tail wing plates. The lower limit device includes a base plate, a U-shaped frame and a positioning bolt. The U-shaped frame is welded and fixed to the base plate to form a limit frame. The limit frame is welded and fixed to the left and right tail wing plates. A positioning groove is formed between the limit frame and the left or right tail wing plate. The positioning bolt passes through the U-shaped frame and is fixed to the U-shaped frame by a fastening nut. One end of the positioning bolt extends into the positioning groove. b. Adjust the lower limit devices on the left and right tail flanges according to the design requirements, adjust the length of the positioning bolts extending into the positioning grooves, and form a placement gap between the extended end of the positioning bolts and the positioning grooves. Then, hoist the left and right middle flanges in sequence, and adjust the positions of the left and right middle flanges so that the bottom of the left middle flange is exactly engaged in the placement gap of the lower limit device of the left tail flange, and the bottom of the right middle flange is exactly engaged in the placement gap of the lower limit device of the right tail flange. Finally, connect and fix the left middle flange to the left tail flange and the right middle flange to the right tail flange using bolt assemblies. c. Hoist the second middle truss, adjust its position, and connect and fix both ends of the second middle truss to the left and right flanges of the middle section respectively using bolt assemblies.

5. The method for jacking construction of a prefabricated steel structure bridge according to claim 4, characterized in that: In step (7) of the installation process between the aforementioned compound guide beam and the steel structure bridge unit, the connection steps between the end standard section and the middle standard section are as follows: a. A lower limit device is provided at the lower part of the middle left flange plate and the middle right flange plate. The limit frame in the lower limit device is welded and fixed to the middle left flange plate and the middle right flange plate. A positioning groove is formed between the limit frame and the middle left flange plate or the middle right flange plate. The lower limit device on the middle left flange plate and the middle right flange plate is adjusted to adjust the length of the positioning bolt extending into the positioning groove. A placement gap is formed between the end of the extension of the positioning bolt and the positioning groove. b. Sequentially hoist the left end flange plate and the right end flange plate, and adjust their positions so that the bottom of the left end flange plate is precisely engaged in the placement gap of the lower limit device of the middle left flange plate, and the bottom of the right end flange plate is precisely engaged in the placement gap of the lower limit device of the middle right flange plate. Then, use bolt assemblies to connect and fix the left end flange plate and the middle left flange plate, and the right end flange plate and the middle right flange plate. c. Hoist the middle truss three, adjust the position of the middle truss three, and connect and fix the two ends of the middle truss three to the left end flange plate and the right end flange plate respectively through the bolt assembly.

6. The method for jacking construction of a prefabricated steel structure bridge according to claim 1, characterized in that: In step three above, the jacking and limiting device also includes an expansion assembly. The expansion assembly is installed after the jack is in place, and the steps are as follows: a. A face-expanding component is installed at the top of each jack. The face-expanding component includes an expansion panel and a movable adjustment seat. There are two movable adjustment seats. An adjustment screw is installed on the movable adjustment seat. A slider and a support block are installed on the adjustment screw. Limit nuts are installed on both sides of the slider and both sides of the support block. b. Set the two movable adjustment seats symmetrically on both sides of the jack, weld the movable adjustment seats to the positioning beam, and then install the expansion panel between the corresponding two movable adjustment seats. The expansion panel is rotatably hinged to the support block. c. Connect a support rod to the lifting lug on the back of the expansion panel, then connect the other end of the support rod to the turnbuckle, and connect the turnbuckle to the slider.

7. The method for jacking construction of a prefabricated steel structure bridge according to claim 1, characterized in that: In step one above, the temporary support device includes temporary supports and raised supports. There are two temporary supports and two raised supports. The raised supports are horizontally set on the two temporary supports and the two raised supports are symmetrically distributed. The raised support includes a first longitudinal beam, a block assembly, and a second longitudinal beam. The first longitudinal beam is welded and fixed to the temporary supports. The block assembly is assembled according to the design requirements. Several block assemblies are welded and fixed at the set positions of the first longitudinal beam. Then the second longitudinal beam is welded and fixed to several block assemblies to ensure that the first longitudinal beam and the second longitudinal beam are set horizontally and vertically.

8. The method for jacking construction of a prefabricated steel structure bridge according to claim 1, characterized in that: In step (3) of step three above, stiffening ribs are welded and fixed between the limiting H-beam and the positioning longitudinal beam.

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