Steel pipe arch self-assembly hydraulic lifting support and steel pipe arch overall lifting method

Abstract

The application discloses a kind of steel pipe arch self-assembly hydraulic lifting support and steel pipe arch overall lifting method, crane is assisted the bottom standard section and climbing section installation of this support, and this support is installed by climbing section to complete the remaining lifting support standard section;Steel pipe arch is lifted and installed after being assembled on bridge deck using the lifting support of the application;The entire structure of the present application can be installed and removed by self-assembly design, and the application can not only cancel the use of tower crane in traditional process construction, thereby saving the temporary rental cost of tower crane, saving project cost expenditure, but also reducing the high-altitude operation risk of crane lifting;And it is convenient to install, remove and reuse, reduces the input of material, saves equipment comprehensive cost;Compared with traditional support, the installation difficulty is small, and the high-altitude construction quality control difficulty is low.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a self-assembling hydraulic lifting support for steel pipe arches and a method for lifting steel pipe arches as a whole. Background Technology

[0002] Currently, steel-concrete composite structures are rapidly being applied and promoted in arch bridge systems. Steel-concrete arches are first manufactured and pre-assembled in a factory, then transported to the site for segmental assembly, and finally assembled section by section using cranes or traditional steel-concrete column lifting supports. As the span and weight of steel-concrete arches continue to increase, various safety risks associated with tower cranes are amplified, increasing the difficulty of installing traditional steel-concrete column lifting supports. Furthermore, due to terrain conditions, synchronous positioning and installation by tower cranes is impossible, further increasing safety risks. Considering the high safety risks and poor site suitability of tower cranes, the high difficulty of traditional support installation, and the challenges of high-altitude construction quality control, it is necessary to develop a self-assembling hydraulic lifting support for steel-concrete arches and a method for lifting the entire steel-concrete arch to solve these problems. Summary of the Invention

[0003] The purpose of this invention is to design a self-assembly hydraulic lifting support for steel pipe arches and an overall lifting method for steel pipe arches in order to solve the above problems.

[0004] The present invention achieves the above objectives through the following technical solutions: A self-assembly hydraulic lifting support for steel pipe arches includes: Multiple standard sections; the lifting support is assembled vertically from multiple standard sections to the working height; each standard section is equipped with two sets of lifting steps for lifting and locking the climbing section, one set near the top of the standard section and the other set near the bottom of the standard section; The climbing section is fitted onto the outside of the two standard sections at the top. The climbing section includes a lifting hydraulic jack and lifting claws. The lifting hydraulic jack is vertically inverted and installed inside the climbing section at the top. The bottom working end of the lifting hydraulic jack is used to engage with the two sets of lifting steps of the topmost standard section. The lifting claws are installed below the climbing section and are used to lock and fix with the lifting steps of the standard section. A hoisting truss is provided at the top of the climbing section for the installation or removal of the standard sections. The integral lifting section for steel pipe arches is installed on top of the climbing section. The integral lifting section for steel pipe arches includes continuous jacks, which are used for the overall lifting of the steel pipe arch.

[0005] A method for integrally lifting a steel pipe arch includes the following steps: S1. Use a truck crane to erect a mid-span assembly support, assemble the arch rib segments to be hoisted as a whole in sequence, and install the arch rib cross bracing at the same time. S2. After the main beam is closed at mid-span, use a truck crane to install two self-assembly hydraulic lifting supports, which are used to lift the mid-span arch rib after in-situ assembly. The installation steps for the self-assembly hydraulic lifting supports are as follows: S21. First, pour concrete strip foundations at the locations where the lifting supports are designed for the main beam. Then, use a truck crane to install the first and second standard sections on the strip foundations as a base. Install climbing sections on the outside of the standard sections. S22. Install the steel pipe arch integral lifting section on the transverse I-beam distribution beam of the climbing section; S23. After the lifting hydraulic jack of the climbing section is inserted into the lifting step of the second standard section using the O-shaped tenon at the end of its lifting beam, the lifting hydraulic jack lifts and drives the climbing section to rise as a whole. After the lifting claw avoids the lower lifting step of the second standard section by rotating in one direction, it returns to center and locks into the U-shaped tenon groove of the upper lifting step of the second standard section to complete the locking process, thus completing the lifting process of the climbing section. S24. The lifting truss section of the climbing section is moved outward and the third-level standard section is lifted and lowered onto the second-level standard section. The second-level and third-level standard sections are then fixed with bolts and nuts. S25. Repeat steps S23 and S24 above until the self-assembly hydraulic lifting bracket is lifted to the design height, and the self-assembly hydraulic lifting bracket assembly is completed. S3. Tension the temporary tie rod steel strands, apply them synchronously in stages, and control the unbalanced force of the tie rods on both sides of the transverse bridge to within 20t. Tension the temporary tie rod steel strands to 4×200t. During the tensioning of the tie rods, observe the deformation of the arch ribs and the assembled supports to ensure that the arch ribs gradually detach from the support saddles during the tensioning process. Lift the entire arch rib segment until it is completely free from the support. After the detachment, pause and let it stand still for 1 hour to check for any abnormalities in the important parts of the entire lifting system. If there are no abnormalities, proceed to the next step. S4. Continue to tension the temporary tie rod steel strands in stages, with a tonnage of 50t per stage, and control the unbalanced force of the tie rods on both sides of the transverse bridge to within 20t; during the tensioning of the tie rods, observe the deformation of the arch rib at the same time; lift the arch rib segment as a whole to the design position at a lifting speed of 4-6m / h until the arch rib reaches the design elevation position. S5. Install the arch rib closure section: hoist and weld the arch rib to complete the permanent closure of the arch rib; S6. Remove the self-assembled hydraulic lifting bracket by following the reverse steps of S2, removing the brackets that were installed later first and the brackets that were installed earlier last.

[0006] The beneficial effects of this invention are as follows: This invention relates to a self-assembly hydraulic lifting device for steel pipe arches in steel-concrete composite arch bridges. After the bottom standard section and climbing section of the support are installed with the assistance of a crane, the support completes the installation of the remaining standard sections of the lifting support through the climbing section. After the steel pipe arch is assembled on the bridge deck, it is lifted and installed using the lifting support of this invention. The entire structure of this application can be installed and dismantled through a self-assembly design. Using this application not only eliminates the use of tower cranes in traditional construction processes, thereby saving on temporary tower crane rental costs and project expenses, but also reduces the risks of high-altitude crane operations. Furthermore, it facilitates installation, dismantling, and reuse, reducing material input and saving on overall equipment costs. Compared with traditional supports, it is easier to install and less difficult to control the quality of high-altitude construction. Attached Figure Description

[0007] Figure 1 This is the front view of the standard section in this application; Figure 2 This is a top view of the standard section in this application; Figure 3 This is a schematic diagram of the installation of the U-shaped tenon and O-shaped tenon in the standard section of this application; wherein A is a structural schematic diagram of the O-shaped tenon, B is a schematic diagram of the installation structure of the U-shaped tenon on the standard section steel column, and C is a schematic diagram of the installation structure of the O-shaped tenon on the U-shaped tenon. Figure 4 This is the front view of the climb section in this application; Figure 5 This is a side view of the climbing section in this application; Figure 6 This is a top view of the climbing section in this application; Figure 7 This is a structural schematic diagram of the integral lifting section of the steel pipe arch in this application; Figure 8 This is a schematic diagram of the lifting claw structure in this application; Figure 9 This is a schematic diagram of the assembly structure of the first and second layer standard sections, climbing sections, and integral lifting sections of the steel pipe arch in this application; Figure 10 A schematic diagram of the structure in which the O-shaped tenon at the end of the lifting beam is inserted into the lifting step 7 of the second-layer standard section; Figure 11 A structural diagram illustrating the lifting of a standard section using a hoisting truss. Figure 12 This is a schematic diagram of the structure after the installation of the third-layer standard section; Figure 13 This is a schematic diagram of the structure for locking the lifting beam to the lifting steps on the third-level standard section.

[0008] Reference numerals: 1-Climbing section; 2-Standard section; 3-Integral lifting section of steel pipe arch; 4-Standard section steel column; 5-Standard section steel column connection system; 6-Steel column flange; 7-Lifting step; 8-U-shaped tenon; 9-O-shaped tenon; 10-Climbing section steel column; 11-Climbing section steel column connection system; 12-Transverse I-beam distribution beam; 13-Lifting truss; 14-Lifting hydraulic jack; 15-Jack body; 16-Lifting crossbeam; 17-Lifting claw; 18-Limiting groove; 19-Longitudinal I-beam distribution beam; 20-Continuous jack; 21-Temporary tie rod steel strand. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0010] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0011] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0012] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0013] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0014] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0015] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0016] like Figure 1-11 As shown, a self-assembling hydraulic lifting support for a steel pipe arch includes: Multiple standard sections 2; the lifting support is assembled vertically from multiple standard sections 2 to the working height; each standard section 2 is equipped with two sets of lifting steps 7 for lifting and locking the climbing section 1, one set near the top of the standard section 2 and the other set near the bottom of the standard section 2; Climbing section 1; Climbing section 1 is fitted onto the outside of the two standard sections 2 located at the top. Climbing section 1 includes a lifting hydraulic jack 14 and a lifting claw 17. The lifting hydraulic jack 14 is vertically inverted and installed inside the upper part of the climbing section 1. The bottom working end of the lifting hydraulic jack 14 is used to engage with the two sets of lifting steps 7 of the topmost standard section 2 for lifting. The lifting claw 17 is installed below the climbing section 1. The lifting claw 17 is used to lock and fix with the lifting steps 7 of the standard section 2. A hoisting truss 13 is provided at the top of the climbing section 1. The hoisting truss 13 is used for the installation or removal of the standard section 2. The steel pipe arch integral lifting section 3 is installed on top of the climbing section 1. The steel pipe arch integral lifting section 3 includes a continuous jack 20, which is used for the overall lifting of the steel pipe arch.

[0017] like Figure 1-2 As shown, standard section 2 includes four parallel standard steel columns 4. A standard steel column connecting system 5 is provided between any two adjacent standard steel columns 4. Steel column flanges 6 are provided at the upper and lower ends of the standard steel columns 4. Adjacent standard sections 2 are connected by steel column flanges 6 and bolts and nuts. Each standard steel column 4 is provided with two lifting steps 7, one near the top of the standard steel column 4 and the other near the bottom of the standard steel column 4. The lifting steps 7 on two standard steel columns 4 are installed on the first side, and the lifting steps 7 on the other two standard steel columns 4 are installed on the second side, which is the opposite side of the first side.

[0018] In some embodiments, the standard steel column 4 is a 4m long, Φ600mm, 10mm thick spiral steel pipe column. The spacing between adjacent standard steel columns 4 is 4m. The standard steel column connection system 5 is made of 16# I-beams and welded between the standard steel columns 4. The two lifting steps 7 are on one standard steel column 4, and the distance between the top and bottom of the standard steel column 4 is 1 meter.

[0019] In some embodiments, the lifting step 7 is made of 4cm thick steel plate and welded to the standard steel column 4.

[0020] like Figure 3 As shown, the top of the lifting step 7 is provided with a U-shaped tenon 8 with an opening facing upwards.

[0021] like Figure 3-4 As shown, there are two hydraulic jacks 14. Each hydraulic jack 14 includes a jack body 15 and a lifting beam 16. The jack body 15 is installed on the standard section steel column connection system 5. The middle part of the lifting beam 16 is connected to the piston rod of the jack body 15. The lifting beam 16 is made of square steel and is perpendicular to the piston rod. Each end of the lifting beam 16 is connected to an O-shaped tenon 9, which is used to engage with the U-shaped tenon 8.

[0022] like Figure 4-6 As shown, the climbing section 1 includes four climbing section steel columns 10. A climbing section steel column connecting system 11 is provided between any two adjacent climbing section steel columns 10. A transverse I-beam distribution beam 12 is welded to the top of every two climbing section steel columns 10. The two transverse I-beam distribution beams 12 are parallel to each other. The hoisting truss 13 is installed on the two transverse I-beam distribution beams 12.

[0023] In some embodiments, the climbing section steel column 10 is a 10m long Φ600mm thick spiral steel pipe column with a wall thickness of 10mm. The spacing between adjacent climbing section steel columns 10 is 5.5m. The climbing section steel column connecting system 11 is made of 16# I-beams and welded between the climbing section steel columns 10. The transverse I-beam distribution beam 12 is made of double 45# I-beams and is 6.5m long.

[0024] The hoisting truss 13 includes a fixed rail, a sliding frame, slings, and a hook. The fixed rail is installed on two transverse I-beam distribution beams 12. The sliding frame is in a limiting sliding fit with the fixed rail. The upper end of the sling is connected to the middle of the sliding frame, and the lower end of the sling is connected to the hook. The hoisting truss 13 completes the lifting and positioning installation of the standard section 2 through the slings and hooks installed on it.

[0025] like Figure 8-9As shown, the lifting claw 17 is a one-way rotating buckle. The lifting claw 17 has a limit groove 18 on its back. Correspondingly, a limit block is installed on the lifting section steel column 10. The first end of the lifting claw 17 is rotatably installed on the lifting section steel column 10. The second end of the lifting claw 17 is provided with an O-shaped tenon 9 for engaging with the U-shaped tenon groove 8. The limit block and the limit groove 18 are in a limit sliding engagement. When the lifting claw 17 is in a horizontal position, the limit block is located at the leftmost end of the limit groove 18. This means that the second end of the lifting claw 17 can only rotate downwards when in a horizontal position. When the lifting section 1 is lifted, it rotates downwards under the action of the lifting step 7 above. A spring can be installed here; the spring is compressed when the lifting claw 17 rotates downwards until the lifting claw 17 disengages from the locking mechanism of the lifting step 7. Then, the lifting section 1 is lowered under the action of the spring, and the O-shaped tenon 9 of the lifting claw 17 engages with the lifting step 7. Alternatively, the rotation of the lifting claw 17 can be controlled manually or by machine, depending on the requirements.

[0026] like Figure 7 As shown, the integral lifting section 3 of the steel pipe arch includes a longitudinal H-beam distribution beam 19 and a continuous jack 20. The longitudinal H-beam distribution beam 19 is installed on the middle of two transverse H-beam distribution beams 12. The continuous jack 20 is installed at the mid-span of the longitudinal H-beam distribution beam 19 and connected by bolts and nuts. The continuous jack 20 includes multiple lifting cylinders, which are of the through-core structure. The continuous jack 20 is connected to the steel pipe arch to be lifted through temporary tie rod steel strands 21. The integral lifting of the steel pipe arch is completed by tensioning the temporary tie rod steel strands 21. The temporary tie rod steel strands 21 are made of high-strength, low-relaxation prestressed steel strands with a nominal diameter of 15.24 mm and a tensile strength of 1860 MPa.

[0027] In some embodiments, the integral lifting section 3 of the steel pipe arch also includes a hydraulic pump station (drive component), sensor detection, computer control (control component), and a remote monitoring system. Each lifting cylinder undergoes rigorous testing in the factory, primarily including functional and durability tests; each cylinder is designed with load protection to ensure more reliable and safe overall lifting. The hydraulic pump station is the power drive component of the lifting system. Proportional synchronization technology is employed in the hydraulic system to effectively improve the synchronous adjustment performance of the entire system and ensure operational reliability. Sensor detection is used to obtain position information, load information, and the aerial attitude information of the entire lifted component. This information is transmitted in real time to the main control computer for analysis and determination of the next action of the lifting cylinder, while ensuring the synchronous adjustment of the entire system. Through electro-hydraulic proportional control technology, synchronous control in hydraulic lifting is achieved, with the synchronous control accuracy between points within ±1mm.

[0028] A method for integrally lifting a steel pipe arch includes the following steps: S1. Use a truck crane to erect a mid-span assembly support, assemble the arch rib segments to be hoisted as a whole in sequence, and install the arch rib cross bracing at the same time. S2. After the main beam is closed at mid-span, use a truck crane to install two self-assembly hydraulic lifting supports to lift the mid-span arch ribs after in-situ assembly; Figure 9-13 As shown, the installation steps for the self-assembly hydraulic lifting support are as follows: S21. First, pour C25 concrete strip foundation at the location where the lifting support is designed for the main beam. Then, use a truck crane to install the first and second standard sections 2 on the strip foundation as the foundation. Install the climbing section 1 on the outside of the standard section 2. S22. Install the steel pipe arch integral lifting section 3 on the transverse I-beam distribution beam 12 of the climbing section 1; S23. After the lifting hydraulic jack 14 of the climbing section 1 is inserted into the lifting step 7 of the second standard section 2 by using the O-shaped tenon 9 at the end of its lifting beam 16, the lifting hydraulic jack 14 lifts and drives the climbing section 1 to be lifted as a whole. The lifting claw 17 avoids the lower lifting step 7 of the second standard section 2 by rotating in one direction. Then, the lifting claw 17 returns to the center and is locked into the U-shaped tenon 8 of the upper lifting step 7 of the second standard section 2, thus completing the lifting process of the climbing section 1. S24. The hoisting truss 13 of the climbing section 1 is moved outward and the third-layer standard section 2 is hoisted. The lifting and lowering is completed and the second-layer standard section 2 is placed on the second-layer standard section 2. The second-layer and third-layer standard sections 2 are fixed by bolts and nuts. S25. Repeat steps S23 and S24 above until the self-assembly hydraulic lifting bracket is lifted to the design height, and the self-assembly hydraulic lifting bracket assembly is completed. S3. Tension the temporary tie rod steel strand 21, apply load synchronously in stages, and control the unbalanced force of the tie rods on both sides of the transverse bridge to within 20t. Tension the temporary tie rod steel strand 21 to 4×200t. During the tensioning of the tie rod, observe the deformation of the arch rib and the assembled support to ensure that the arch rib gradually detaches from the support saddle during the tensioning process. Lift the entire section of the arch rib to completely detach from the support. After detachment (5cm detachment), pause and let stand still for 1 hour to check for any abnormalities in the important parts of the entire lifting system. If no abnormalities are found, proceed to the next step. S4. Continue to tension the temporary tie rod steel strands 21 in stages, with a tonnage of 50t per stage, and control the unbalanced force of the tie rods on both sides of the transverse bridge to within 20t; during the tensioning of the tie rods, observe the deformation of the arch rib at the same time; lift the arch rib segment as a whole to the design position at a lifting speed of 4-6m / h (cable retraction speed) until the arch rib reaches the design elevation position. S5. Install the arch rib closure section: hoist and weld the arch rib to complete the permanent closure of the arch rib; S6. Dismantle the self-assembled hydraulic lifting support in the reverse order of step S2. The principle of "dismantling the last installed parts first and the last installed parts last" should be followed to ensure the stability of the structure during the dismantling process and prevent collapse accidents.

[0029] The following preparations are required during the upgrade process: ①After the mid-span arch rib and cross brace are assembled on the main beam bridge deck, install the lifting cylinders in place according to the layout diagram of the lifting cylinders; ② Install lifting pipes and control equipment; ③ The hoisting of the hydraulic cylinder pump station and the installation of the steel strand require the assistance of a crane; ④ Use a 2-ton manual hoist to pull the steel strands so that each strand in a bundle of steel strands is basically the same length; ⑤ Before all hydraulic cylinders are put into formal use, a load test should be conducted and the operation of the anchor should be checked. ⑥ The installation position of the hydraulic cylinder after it is in place should meet the design requirements; otherwise, necessary adjustments should be made. In order to reduce the amount of pre-tightening work of the steel strand, the cutting length of the steel strand should be as consistent as possible when cutting the steel strand, and the length of the steel strand should be consistent when threading it through.

[0030] The overall mid-span arch rib lifting process includes two stages: trial lifting and formal lifting. During the trial improvement, the following steps are included: ① Improve loading a. Before lifting, the transverse cables need to be tensioned to 10% of the rated tension. b. Pre-lifting: Tension and lift the lifting steel strands to ensure that the central arch is separated from the lower support. c. The transverse cables are tensioned at 100% of their rated tension. ②Inspection of the supporting structure a. Check whether the welds of the structure are normal; b. Check whether the structural deformation is within the allowable range; ③ Inspection of control schemes Check the synchronization status and make necessary modifications and adjustments to the control parameters.

[0031] ④ Aerial Stasis After the trial lifting was completed, the steel pipe arch was lifted and detached from the support by about 50mm, hovering in the air. Personnel were organized to observe the structure regularly. The formal upgrade includes the following steps: ①If there are no problems after a trial promotion and observation, then a formal promotion will be carried out; ②During the formal lifting process, record the pressure and elevation at each point; ③Precautions for lifting: Considering the high risk of the control system descending, the lifting end position should be slightly lower than the theoretical elevation, and further precise adjustments should be made when in place.

[0032] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A self-assembly hydraulic lifting support for a steel pipe arch, characterized in that, include: Multiple standard sections; The lifting support is assembled vertically from multiple standard sections to the working height; each standard section is equipped with two sets of lifting steps for lifting and locking the climbing section, one set near the top of the standard section and the other set near the bottom of the standard section. The climbing section is fitted onto the outside of the two standard sections at the top. The climbing section includes a lifting hydraulic jack and lifting claws. The lifting hydraulic jack is vertically inverted and installed inside the climbing section at the top. The bottom working end of the lifting hydraulic jack is used to engage with the two sets of lifting steps of the topmost standard section. The lifting claws are installed below the climbing section and are used to lock and fix with the lifting steps of the standard section. A hoisting truss is provided at the top of the climbing section for the installation or removal of the standard sections. The integral lifting section for steel pipe arches is installed on top of the climbing section. The integral lifting section for steel pipe arches includes continuous jacks, which are used for the overall lifting of the steel pipe arch.

2. The self-assembly hydraulic lifting support for a steel pipe arch according to claim 1, characterized in that, A standard section consists of four parallel standard steel columns. A connecting system is provided between any two adjacent standard steel columns. Steel column flanges are provided at the top and bottom of the standard steel columns. Adjacent standard sections are connected by steel column flanges and bolts and nuts. Each standard steel column is provided with two lifting steps, one near the top of the standard steel column and the other near the bottom of the standard steel column. The lifting steps on two standard steel columns are installed on the first side, and the lifting steps on the other two standard steel columns are installed on the second side, which is the opposite side of the first side.

3. The self-assembly hydraulic lifting support for a steel pipe arch according to claim 2, characterized in that, The top of the lifting step is provided with a U-shaped tenon with an opening facing upwards.

4. The self-assembly hydraulic lifting support for a steel pipe arch according to claim 3, characterized in that, There are two lifting hydraulic jacks. The lifting hydraulic jacks include a jack body and a lifting beam. The jack body is installed on the standard section steel column connection system. The middle part of the lifting beam is connected to the piston rod of the jack body. Each end of the lifting beam is connected to an O-shaped tenon, which is used to engage with the U-shaped tenon groove.

5. A self-assembly hydraulic lifting support for a steel pipe arch according to claim 4, characterized in that, The climbing section consists of four climbing section steel columns. A climbing section steel column connection system is set between any two adjacent climbing section steel columns. A transverse I-beam distribution beam is welded to the top of every two climbing section steel columns. The two transverse I-beam distribution beams are parallel to each other. The hoisting truss is installed on the two transverse I-beam distribution beams.

6. The self-assembly hydraulic lifting support for a steel pipe arch according to claim 5, characterized in that, The hoisting truss includes a fixed rail, a sliding frame, slings, and a hook. The fixed rail is installed on two transverse I-beam distribution beams. The sliding frame is in a limiting sliding fit with the fixed rail. The upper end of the sling is connected to the middle of the sliding frame, and the lower end of the sling is connected to the hook.

7. The self-assembly hydraulic lifting support for a steel pipe arch according to claim 5, characterized in that, The lifting claw is a one-way rotating buckle. A limit groove is provided on the back of the lifting claw. Correspondingly, a limit block is installed on the steel column of the lifting section. The first end of the lifting claw is rotatably installed on the steel column of the lifting section. The second end of the lifting claw is provided with an O-shaped tenon for engaging with the U-shaped tenon groove. The limit block and the limit groove are in a limiting sliding engagement. When the lifting claw is in a horizontal position, the limit block is located at the leftmost end of the limit groove.

8. A self-assembly hydraulic lifting support for a steel pipe arch according to claim 5, characterized in that, The steel pipe arch integral lifting section includes a longitudinal H-beam distribution beam and continuous jacks. The longitudinal H-beam distribution beam is installed on the middle of two transverse H-beam distribution beams. The continuous jacks are installed at the mid-span of the longitudinal H-beam distribution beam and connected by bolts and nuts. The continuous jacks include multiple lifting cylinders, which are through-core structures. The continuous jacks are connected to the steel pipe arch to be lifted through temporary tie rod steel strands. The overall lifting of the steel pipe arch is completed by tensioning the temporary tie rod steel strands.

9. A method for integrally lifting a steel pipe arch, characterized in that, Including the following steps: S1. Use a truck crane to erect a mid-span assembly support, assemble the arch rib segments to be hoisted as a whole in sequence, and install the arch rib cross bracing at the same time. S2. After the main beam is closed at mid-span, use a truck crane to install two self-assembly hydraulic lifting supports, which are used to lift the mid-span arch rib after in-situ assembly. The installation steps for the self-assembly hydraulic lifting supports are as follows: S21. First, pour concrete strip foundations at the locations where the lifting supports are designed for the main beam. Then, use a truck crane to install the first and second standard sections on the strip foundations as a base. Install climbing sections on the outside of the standard sections. S22. Install the steel pipe arch integral lifting section on the transverse I-beam distribution beam of the climbing section; S23. After the lifting hydraulic jack of the climbing section is inserted into the lifting step of the second standard section using the O-shaped tenon at the end of its lifting beam, the lifting hydraulic jack lifts and drives the climbing section to rise as a whole. After the lifting claw avoids the lower lifting step of the second standard section by rotating in one direction, it returns to center and locks into the U-shaped tenon groove of the upper lifting step of the second standard section to complete the locking process, thus completing the lifting process of the climbing section. S24. The lifting truss section of the climbing section is moved outward and the third-level standard section is lifted and lowered onto the second-level standard section. The second-level and third-level standard sections are then fixed with bolts and nuts. S25. Repeat steps S23 and S24 above until the self-assembly hydraulic lifting bracket is lifted to the design height, and the self-assembly hydraulic lifting bracket assembly is completed. S3. Tension the temporary tie rod steel strands, apply them synchronously in stages, and control the unbalanced force of the tie rods on both sides of the transverse bridge to within 20t. Tension the temporary tie rod steel strands to 4×200t. During the tensioning of the tie rods, observe the deformation of the arch ribs and the assembled supports to ensure that the arch ribs gradually detach from the support saddles during the tensioning process. Lift the entire arch rib segment until it is completely free from the support. After the detachment, pause and let it stand still for 1 hour to check for any abnormalities in the important parts of the entire lifting system. If there are no abnormalities, proceed to the next step. S4. Continue to tension the temporary tie rod steel strands in stages, with a tonnage of 50t per stage, and control the unbalanced force of the tie rods on both sides of the transverse bridge to within 20t; during the tensioning of the tie rods, observe the deformation of the arch rib at the same time; lift the arch rib segment as a whole to the design position at a lifting speed of 4-6m / h until the arch rib reaches the design elevation position. S5. Install the arch rib closure section: hoist and weld the arch rib to complete the permanent closure of the arch rib; S6. Remove the self-assembled hydraulic lifting bracket by following the reverse steps of S2, removing the brackets that were installed later first and the brackets that were installed earlier last.

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