Steel arch bridge arch rib hoisting posture multidirectional adjusting device and adjusting method

Abstract

The present application relates to the technical field of steel arch bridge hoisting construction, and particularly relates to a steel arch bridge arch rib hoisting posture multidirectional adjusting device and adjusting method. The present application changes the arch rib hoisting posture from air adjustment to land adjustment, and realizes the automatic adjustment of the arch rib hoisting posture and the hanger lug position through an automatic adjusting system, which can greatly improve the construction efficiency and hoisting precision. The device has a simple structure, is convenient to transport and manufacture, and is convenient to use. The device does not need a large-tonnage crane, has no aerial operation, has high construction efficiency, greatly improved safety factor, and greatly reduced construction cost. The automatic electric control oil pressure machine hoisting posture device and adjusting method can adjust the hoisting posture of different spatial posture components, need not replace the equipment, only need to replace the relative position of the front and rear adjusting bases and the base cross slope value, and can be repeatedly used. The construction device composed of higher generality materials such as steel pipes and I-beams has safety and reliability, simple structure, low cost, and is convenient to install, can be disassembled, and can be repeatedly used.

Description

Technical Field

[0001] This invention relates to the field of steel arch bridge hoisting and construction technology, and in particular to a multi-directional adjustment device and method for the hoisting posture of steel arch bridge ribs. Background Technology

[0002] my country has a long history of arch bridges, with various styles. In recent years, with the continuous development of science and technology and the economy, steel arch bridges have been increasingly built and used, and their structural designs and construction techniques are constantly being innovated. The manufacturing of steel arch bridge ribs generally adopts a segmented hoisting process. During the segmented hoisting of the arch ribs on site, it is quite difficult to accurately adjust the spatial posture of each segment of the arch rib, especially for inward or outward inclined structures, where adjusting the hoisting posture is particularly difficult and requires simultaneous multi-directional adjustment of the arch rib hoisting posture, which presents a high level of hoisting difficulty.

[0003] Existing technologies generally employ a dual-crane lifting and aerial adjustment method. This involves planning the arrangement of lifting lugs, allocating the lifting tonnage of the two cranes, and adjusting the length of the wire rope using pulley blocks to achieve lifting posture adjustment. However, aerial adjustment has a high risk factor, is difficult to control precisely, has low construction efficiency, and is costly when using dual cranes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a multi-directional adjustment device and method for the hoisting posture of steel arch bridge ribs, which can safely and efficiently carry out the hoisting posture adjustment construction of steel arch bridge ribs, in order to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A multi-directional adjustment device for the hoisting posture of a steel arch bridge rib is used to adjust the hoisting posture of the rib to be installed. It includes a front adjustment base 1 installed at the front of the rib to be installed and a rear adjustment base 2 installed at the rear of the rib to be installed. A slide rail 29 is installed on the top of the rib to be installed. An electric lifting lug 28 is provided on the slide rail 29. The front adjustment base 1, the rear adjustment base 2 and the electric lifting lug 28 are all connected to an automatic adjustment system 3.

[0007] The front adjustment base 1 includes a front pad beam 11, on which a height adjustment hydraulic press 12 for adjusting the height of the front part of the arch rib to be installed is installed. The rear adjustment base 2 includes a rear pad beam 21, on which a steel pipe 23 for supporting the rear part of the arch rib to be installed is installed.

[0008] The front adjusting base 1 and the rear adjusting base 2 are respectively equipped with a front lateral adjusting hydraulic press 17 and a rear lateral adjusting hydraulic press 25. The front lateral adjusting hydraulic press 17 and the rear lateral adjusting hydraulic press 25 are respectively connected to a front lateral supporting steel frame 18 and a rear lateral supporting steel frame 26. The front lateral supporting steel frame 18 and the rear lateral supporting steel frame 26 are in contact with the side walls of the front and rear parts of the arch rib to be installed, respectively.

[0009] Furthermore, a cross slope leveling steel 16 is installed on the front pad beam 11 at a position between the height adjusting hydraulic press 12 and the front lateral adjusting hydraulic press 17. Both the height adjusting hydraulic press 12 and the cross slope leveling steel 16 are installed on the front pad beam 11 through a pad 13 and connecting bolts 15. The pad 13 is provided with a stiffening plate 14.

[0010] Furthermore, the front lateral adjustment hydraulic press 17 is connected to the front lateral support steel frame 18 via the front connecting member 19.

[0011] Furthermore, the steel pipe 23 is fixed to the rear pad beam 21 by the steel pipe support body 24.

[0012] Furthermore, the portion of the steel pipe 23 that contacts the rear part of the arch rib to be installed is padded with cushioning rubber 22.

[0013] Furthermore, the rear lateral adjustment hydraulic press 25 is connected to the rear lateral support steel frame 26 via the rear connecting member 27.

[0014] Based on the same inventive concept, this application also provides a method for multi-directional adjustment of the hoisting posture of a steel arch bridge rib, based on the multi-directional adjustment device for the hoisting posture of a steel arch bridge rib as described above, characterized by including the following steps:

[0015] S1, 3D modeling and layout, and calculation and determination of the multi-directional adjustment positioning value of the arch rib hoisting posture in the software;

[0016] S2, fabricate the front adjustment base and the rear adjustment base, and install them onto the front and rear of the arch rib to be installed, respectively;

[0017] S3, adjust the hoisting posture of the arch rib to be installed, and install the lifting lugs for hoisting and installation;

[0018] S4. After step S3 is completed, keep the front and rear adjustment base structures unchanged, and repeat steps S2 to S3 until the hoisting posture adjustment of all the arch ribs to be installed is completed.

[0019] Furthermore, in step S1, the specific steps for determining the multi-directional adjustment positioning value of the arch rib hoisting posture are as follows:

[0020] S11. Based on the preset steel arch bridge structure and the preset hoisting posture of the arch rib to be installed, the arch rib to be installed is laid out in the 3D modeling software.

[0021] S12. Based on the position of the transverse partitions at both ends of the arch rib to be installed and the overall length of the arch rib to be installed (the arch rib segment length direction is close to 1 / 3 position), determine the center position of the front and rear adjustment base arrangement.

[0022] S13. Based on the arrangement of the front and rear adjustment bases and the hoisting posture and structural parameters of the arch rib to be installed, calculate the cross slope value of the bottom surface of the arch rib at the front and rear adjustment bases and the height difference value of the center point of the bottom surface of the arch rib at the front and rear adjustment bases, and calculate the inclination angle of the inner side of the arch rib relative to the horizontal plane at the front and rear adjustment bases.

[0023] S14. Using the parameters obtained in step S13, calculate and generate the center of gravity position of the arch rib to be installed, and determine the lifting lug position according to the principle of relative symmetry of the lifting points based on the center of gravity position, and generate the length from the hook to the four lifting points based on the three-dimensional model.

[0024] Furthermore, in step S13, the height difference H0 between the center points of the bottom surfaces of the arch ribs at the front and rear adjustment bases is calculated as follows:

[0025]

[0026] In the formula, L1 is the longitudinal length of the arch rib to be installed, θ1 is the inclination angle of the inner side of the arch rib relative to the horizontal plane at the front adjustment base, and θ2 is the inclination angle of the inner side of the arch rib relative to the horizontal plane at the rear adjustment base.

[0027] The cross slope value P0 of the bottom surface of the arch rib at the front and rear adjustment base is calculated as follows:

[0028]

[0029] In the formula, H1 is the lateral height of the contact point between the front adjusting base and the arch rib to be installed, H2 is the lateral height of the contact point between the rear adjusting base and the arch rib to be installed, and L2 is the lateral distance between the corresponding contact points of H1 and H2.

[0030] Furthermore, in step S2, the fabrication and assembly of the front adjustment base and the rear adjustment base are carried out as follows:

[0031] S21. Based on the cross slope values ​​of the bottom surface of the arch rib at the front and rear adjustment bases obtained in step S13, fabricate the cross slope leveling steel for the front adjustment base and the steel pipe support for the rear adjustment base.

[0032] S22, based on the center position of the front and rear adjustment bases obtained in step S12, assemble the front and rear adjustment bases sequentially from bottom to top;

[0033] S23, Install the automatic electrical control system for the hydraulic press.

[0034] Furthermore, in step S3, the specific steps for adjusting the hoisting posture of the arch rib to be installed and installing the lifting lugs are as follows:

[0035] S31, input the height difference value of the center point of the bottom surface of the arch rib at the front and rear adjustment base obtained in step S13 into the automatic electronic control system, and adjust the height difference through the height adjustment hydraulic press;

[0036] S32, input the relative horizontal plane inclination angle value of the inner side of the arch rib at the front and rear adjustment base obtained in step S13 into the automatic electronic control system, and adjust the front and rear lateral support steel frame respectively through the front lateral adjustment hydraulic press and the rear adjustment hydraulic press.

[0037] S33, based on the lifting lug position obtained in step S14, control the electric lifting lug to move along the slide rail to the designated position;

[0038] S34. Calculate the total length of the wire rope based on the length from the hook to the four lifting points obtained in step S14.

[0039] S35, hoisting and installing the arch ribs to be installed.

[0040] Compared with the prior art, the present invention has the following main advantages:

[0041] 1. The adjustment device and method provided by this patent change the adjustment of the arch rib hoisting posture from air to land, which greatly improves the safety factor. Moreover, the automatic adjustment system realizes the automatic adjustment of the arch rib hoisting posture and the position of the lifting lug, which can significantly improve construction efficiency and hoisting accuracy.

[0042] 2. The device described in this patent has a simple structure, is easy to transport and manufacture, and is convenient to use. It does not require a large-tonnage crane, does not involve aerial work, has high construction efficiency, greatly improves the safety factor, and significantly reduces construction costs.

[0043] 3. The automatic electric hydraulic press hoisting posture device and adjustment method adopted in this patent can adjust the hoisting posture of components with different spatial postures. No equipment replacement is required. Only the relative position of the front and rear adjustment bases and the cross slope value of the base need to be replaced. It can be reused.

[0044] 4. The construction device involved in this patent, which is made of highly versatile materials such as steel pipes and I-beams, is safe and reliable, has a simple structure that is easy to install, and is low in cost; it is also detachable and reusable. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the overall adjustment device in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the front adjustment base in an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the rear adjustment base in an embodiment of the present invention;

[0048] Figure 4 This is a flowchart of the adjustment method in an embodiment of the present invention.

[0049] In the diagram: 1. Front adjusting base; 2. Rear adjusting base; 3. Automated adjusting system; 11. Front pad beam; 12. Height adjusting hydraulic press; 13. Pad plate; 14. Stiffener plate; 15. Connecting bolt; 16. Cross slope leveling steel; 17. Front lateral adjusting hydraulic press; 18. Front lateral support steel frame; 19. Front connecting component; 21. Rear pad beam; 22. Buffer rubber; 23. Steel pipe; 24. Steel pipe support body; 25. Rear lateral adjusting hydraulic press; 26. Rear lateral support steel frame; 27. Rear connecting component; 28. Electric lifting lug; 29. ​​Slide rail. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0051] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0052] I. A multi-directional adjustment device for the hoisting posture of the arch rib of a steel arch bridge

[0053] like Figure 1 As shown, a multi-directional adjustment device for the hoisting posture of a steel arch bridge rib according to the present invention includes a front adjustment base 1, a rear adjustment base 2 and an automatic adjustment system 3. A slide rail 29 is installed on the top of the rib to be installed, and an electric lifting lug 28 is provided on the slide rail 29. The front adjustment base 1, the rear adjustment base 2 and the electric lifting lug 28 are all connected to the automatic adjustment system 3.

[0054] By inputting the height difference and front and rear tilt angle values ​​of the arch rib segments into the automatic adjustment system 3, the height adjustment hydraulic press 12 adjusts the front and rear height difference of the arch rib, and the front and rear lateral adjustment hydraulic presses 14 and 25 adjust the front and rear tilt angle of the arch rib.

[0055] Among them, the front adjusting base 1 height adjusting hydraulic press 12 plays the role of actively adjusting the front and rear height difference, and the rear adjusting base plays the role of a fulcrum through the buffer rubber 22 and steel pipe 23.

[0056] like Figure 2 As shown, the front adjustment base includes a front pad beam 11, a height adjustment hydraulic press 12, upper and lower pads 13 of the height adjustment hydraulic press, a stiffening plate 14 of the height adjustment hydraulic press, connecting bolts 15, a cross slope leveling steel 16, a front lateral adjustment hydraulic press 17, a front lateral support steel frame 18, and a front connecting component 19.

[0057] like Figure 3 As shown, the rear adjustment base includes a rear pad beam 21, a buffer rubber 22, a steel pipe 23, a steel pipe support body 24, a rear lateral adjustment hydraulic press 25, a rear lateral support steel frame 26, and a rear connecting component 27.

[0058] Note: The lateral support steel frame 18 and 26 are the same component, and the lateral support system is subjected to a force of less than 10t.

[0059] Specifically, the front adjustment base 1 includes a front pad beam 11, on which a height adjustment hydraulic press 12 for adjusting the height of the front part of the arch rib to be installed is installed; the rear adjustment base 2 includes a rear pad beam 21, on which a steel pipe 23 for supporting the rear part of the arch rib to be installed is installed.

[0060] The front adjusting base 1 and the rear adjusting base 2 are respectively equipped with a front lateral adjusting hydraulic press 17 and a rear lateral adjusting hydraulic press 25. The front lateral adjusting hydraulic press 17 and the rear lateral adjusting hydraulic press 25 are respectively connected to a front lateral supporting steel frame 18 and a rear lateral supporting steel frame 26. The front lateral supporting steel frame 18 and the rear lateral supporting steel frame 26 are in contact with the side walls of the front and rear parts of the arch rib to be installed, respectively.

[0061] Furthermore, a cross slope leveling steel 16 is installed on the front pad beam 11 at a position between the height adjusting hydraulic press 12 and the front lateral adjusting hydraulic press 17. Both the height adjusting hydraulic press 12 and the cross slope leveling steel 16 are installed on the front pad beam 11 through a pad 13 and connecting bolts 15. The pad 13 is provided with a stiffening plate 14.

[0062] Furthermore, the front lateral adjustment hydraulic press 17 is connected to the front lateral support steel frame 18 via the front connecting member 19.

[0063] Furthermore, the steel pipe 23 is fixed to the rear pad beam 21 by the steel pipe support body 24.

[0064] Furthermore, the portion of the steel pipe 23 that contacts the rear part of the arch rib to be installed is padded with cushioning rubber 22.

[0065] Furthermore, the rear lateral adjustment hydraulic press 25 is connected to the rear lateral support steel frame 26 via the rear connecting member 27.

[0066] II. A method for multi-directional adjustment of the hoisting posture of the arch ribs of a steel arch bridge

[0067] Based on the same inventive concept, this application also provides a method for multi-directional adjustment of the hoisting posture of a steel arch bridge rib, which, based on the adjustment device described above, specifically includes the following steps:

[0068] Step 1: 3D modeling and layout, and measure the multi-directional adjustment positioning values ​​of the arch rib hoisting posture in the model.

[0069] 1.1 Based on the structural characteristics and hoisting posture requirements of the steel arch bridge, the arch ribs were modeled and laid out in three dimensions using software;

[0070] 1.2 Based on the position of the transverse diaphragms at both ends of the arch rib and the fact that the segment length is close to 1 / 3, determine the center position of the front and rear adjustment bases;

[0071] 1.3 Based on the arrangement of the front and rear adjustment bases and the hoisting posture and structural parameters of the arch rib to be installed, calculate the cross slope value of the bottom surface of the arch rib at the front and rear adjustment bases and the height difference value of the center point of the bottom surface of the arch rib at the front and rear adjustment bases, and calculate the inclination angle of the inner side of the arch rib relative to the horizontal plane at the front and rear adjustment bases.

[0072] 1.4 In the model, the center of gravity of the arch rib is generated using software. Based on the center of gravity, four lifting lugs are arranged according to the relative symmetry of the lifting points and the structural characteristics of the arch rib. The length from the hook to the four lifting points is measured.

[0073] Furthermore, in step 1.3, the height difference H0 between the center points of the bottom surfaces of the arch ribs at the front and rear adjustment bases is calculated as follows:

[0074]

[0075] In the formula, L1 is the longitudinal length of the arch rib to be installed, θ1 is the inclination angle of the inner side of the arch rib relative to the horizontal plane at the front adjustment base, and θ2 is the inclination angle of the inner side of the arch rib relative to the horizontal plane at the rear adjustment base.

[0076] The cross slope value P0 of the bottom surface of the arch rib at the front and rear adjustment base is calculated as follows:

[0077]

[0078] In the formula, H1 is the lateral height of the contact point between the front adjusting base and the arch rib to be installed, H2 is the lateral height of the contact point between the rear adjusting base and the arch rib to be installed, and L2 is the lateral distance between the corresponding contact points of H1 and H2.

[0079] Step 2: Fabrication and assembly of the front and rear adjustable base.

[0080] 2.1 Based on the cross slope values ​​of the bottom surface of the arch rib at the front and rear adjustment bases obtained in step 1, fabricate the cross slope leveling steel 16 for the front adjustment base and the steel pipe support 24 for the rear adjustment base.

[0081] 2.2 After obtaining the facing position of the front and rear adjustment bases in step 1, assemble the front and rear adjustment bases sequentially from bottom to top;

[0082] 2.3 Install the automatic electrical control system for the hydraulic press;

[0083] 2.4 Based on the height difference value of the center point of the bottom surface of the arch rib at the front and rear adjustment base obtained in step 1, input it into the automatic electronic control system, and adjust the height difference using the height adjustment hydraulic press 12; at the same time, based on the inclination angle value of the inner side of the arch rib at the front and rear adjustment base relative to the horizontal plane obtained in step 1, input it into the automatic electronic control system, and adjust the front lateral adjustment hydraulic press 17 and the rear adjustment hydraulic press 25 respectively to adjust the front and rear lateral support steel frames.

[0084] Step 3: Adjust the hoisting posture and lift for installation.

[0085] 3.1 Based on the position of the lifting lugs obtained in step 1, install the lifting lugs;

[0086] Based on the length from the hook to the four lifting points obtained in step 1, calculate the total length of the wire rope;

[0087] 3.2 Use a crane to lift the starting arch rib horizontally. Based on the center position of the front and rear adjustment bases and the positioning value of the inner inclined surface near the inner inclined support steel frame obtained in step 1, position it on the arch rib lifting posture adjustment device.

[0088] 3.3 After the arch rib hoisting posture is adjusted, and based on the length from the hook to the four hoisting points obtained in step 1, adjust the distance from the wire rope to the four hoisting points, and then hoist and install the arch rib;

[0089] Step 4: After the arch rib segment is lifted and installed, repeat steps 2 and 3 to complete the construction of adjusting the lifting posture of the next segment without replacing most of the structure such as the pad beam, hydraulic press, lateral support steel frame and connecting parts.

[0090] In summary:

[0091] 1. The adjustment device and method provided by this patent change the adjustment of the arch rib hoisting posture from air to land, and realize the automatic adjustment of the arch rib hoisting posture and the position of the lifting lug through the automatic adjustment system, which can greatly improve construction efficiency and hoisting accuracy.

[0092] 2. The device described in this patent has a simple structure, is easy to transport and manufacture, and is convenient to use. It does not require a large-tonnage crane, does not involve aerial work, has high construction efficiency, greatly improves the safety factor, and significantly reduces construction costs.

[0093] 3. The automatic electric hydraulic press hoisting posture device and adjustment method adopted in this patent can adjust the hoisting posture of components with different spatial postures. No equipment replacement is required. Only the relative position of the front and rear adjustment bases and the cross slope value of the base need to be replaced. It can be reused.

[0094] 4. The construction device involved in this patent, which is made of highly versatile materials such as steel pipes and I-beams, is safe and reliable, has a simple structure that is easy to install, and is low in cost; it is also detachable and reusable.

[0095] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for multi-directional adjustment of the hoisting posture of a steel arch bridge rib, based on a multi-directional adjustment device for the hoisting posture of a steel arch bridge rib, used to adjust the hoisting posture of the rib to be installed, characterized in that: The steel arch bridge arch rib hoisting posture multi-directional adjustment device includes a front adjustment base (1) installed at the front of the arch rib to be installed and a rear adjustment base (2) installed at the rear of the arch rib to be installed. A slide rail (29) is installed on the top of the arch rib to be installed. An electric lifting lug (28) is provided on the slide rail (29). The front adjustment base (1), the rear adjustment base (2), and the electric lifting lug (28) are all connected to an automatic adjustment system (3). The front adjustment base (1) includes a front pad beam (11), on which a height adjustment hydraulic press (12) for adjusting the height of the front part of the arch rib to be installed is installed. The rear adjustment base (2) includes a rear pad beam (21), on which a steel pipe (23) for supporting the rear part of the arch rib to be installed is installed. The front adjustment base (1) and the rear adjustment base (2) are respectively equipped with a front lateral adjustment hydraulic press (17) and a rear lateral adjustment hydraulic press (25). The front lateral adjustment hydraulic press (17) and the rear lateral adjustment hydraulic press (25) are respectively connected to a front lateral support steel frame (18) and a rear lateral support steel frame (26). The front lateral support steel frame (18) and the rear lateral support steel frame (26) are respectively in contact with the side walls of the front and rear parts of the arch rib to be installed. The multi-directional adjustment method for hoisting attitude includes the following steps: S1, 3D modeling and layout, and calculation and determination of the multi-directional adjustment positioning value of the arch rib hoisting posture in the software; S2, fabricate the front adjustment base and the rear adjustment base, and install them onto the front and rear of the arch rib to be installed, respectively; S3, adjust the hoisting posture of the arch rib to be installed, and install the lifting lugs for hoisting and installation; S4. After step S3 is completed, keep the front and rear adjustment base structures unchanged, and repeat steps S2 to S3 until the hoisting posture adjustment of all the arch ribs to be installed is completed. The specific steps for determining the multi-directional adjustment and positioning value of the arch rib hoisting posture are as follows: S11. Based on the preset steel arch bridge structure and the preset hoisting posture of the arch rib to be installed, the arch rib to be installed is laid out in the 3D modeling software. S12. Determine the center position of the front and rear adjustment bases based on the position of the transverse partitions at both ends of the arch rib to be installed and the overall length of the arch rib to be installed. S13. Based on the arrangement of the front and rear adjustment bases and the hoisting posture and structural parameters of the arch rib to be installed, calculate the cross slope value of the bottom surface of the arch rib at the front and rear adjustment bases and the height difference value of the center point of the bottom surface of the arch rib at the front and rear adjustment bases, and calculate the inclination angle of the inner side of the arch rib relative to the horizontal plane at the front and rear adjustment bases. S14. Using the parameters obtained in step S13, calculate and generate the center of gravity position of the arch rib to be installed, and determine the lifting lug position according to the principle of relative symmetry of the lifting points based on the center of gravity position, and generate the length from the hook to the four lifting points based on the three-dimensional model.

2. The method for multi-directional adjustment of the hoisting posture of the arch rib of a steel arch bridge according to claim 1, characterized in that: A cross slope leveling steel (16) is installed on the front pad beam (11) at the position between the height adjusting hydraulic press (12) and the front lateral adjusting hydraulic press (17). The height adjusting hydraulic press (12) and the cross slope leveling steel (16) are both installed on the front pad beam (11) by means of a pad (13) and connecting bolts (15). A stiffening plate (14) is provided on the pad (13).

3. The method for multi-directional adjustment of the hoisting posture of the arch rib of a steel arch bridge according to claim 2, characterized in that: The front lateral adjustment hydraulic press (17) is connected to the front lateral support steel frame (18) via the front connecting member (19).

4. The method for multi-directional adjustment of the hoisting posture of the arch rib of a steel arch bridge according to claim 1, characterized in that: The steel pipe (23) is fixed to the rear pad beam (21) by the steel pipe support (24); the part of the steel pipe (23) that contacts the rear part of the arch rib to be installed is padded with buffer rubber (22).

5. The method for multi-directional adjustment of the hoisting posture of the arch rib of a steel arch bridge according to claim 1, characterized in that: The rear lateral adjustment hydraulic press (25) is connected to the rear lateral support steel frame (26) via a rear connecting member (27).

6. The method for multi-directional adjustment of the hoisting posture of the arch rib of a steel arch bridge according to claim 1, characterized in that... In step S13, the height difference H0 between the center points of the bottom surfaces of the arch ribs at the front and rear adjustment bases is calculated as follows: In the formula, L1 is the longitudinal length of the arch rib to be installed, θ1 is the inclination angle of the inner side of the arch rib relative to the horizontal plane at the front adjustment base, and θ2 is the inclination angle of the inner side of the arch rib relative to the horizontal plane at the rear adjustment base. The cross slope value P0 of the bottom surface of the arch rib at the front and rear adjustment base is calculated as follows: In the formula, H1 is the lateral height of the contact point between the front adjusting base and the arch rib to be installed, H2 is the lateral height of the contact point between the rear adjusting base and the arch rib to be installed, and L2 is the lateral distance between the corresponding contact points of H1 and H2.

7. A method for multi-directional adjustment of the hoisting posture of a steel arch bridge rib according to claim 6, characterized in that... In step S2, the fabrication and assembly of the front adjustment base and the rear adjustment base are carried out in the following specific steps: S21. Based on the cross slope values ​​of the bottom surface of the arch rib at the front and rear adjustment bases obtained in step S13, fabricate the cross slope leveling steel for the front adjustment base and the steel pipe support for the rear adjustment base. S22, based on the center position of the front and rear adjustment bases obtained in step S12, assemble the front and rear adjustment bases sequentially from bottom to top; S23, Install the automatic electrical control system for the hydraulic press.

8. A method for multi-directional adjustment of the hoisting posture of a steel arch bridge rib according to claim 6, characterized in that... In step S3, the specific steps for adjusting the hoisting posture of the arch rib to be installed and installing the lifting lugs are as follows: S31, input the height difference value of the center point of the bottom surface of the arch rib at the front and rear adjustment base obtained in step S13 into the automatic electronic control system, and adjust the height difference through the height adjustment hydraulic press; S32, input the relative horizontal plane inclination angle value of the inner side of the arch rib at the front and rear adjustment base obtained in step S13 into the automatic electronic control system, and adjust the front and rear lateral support steel frame respectively through the front lateral adjustment hydraulic press and the rear lateral adjustment hydraulic press. S33, based on the lifting lug position obtained in step S14, control the electric lifting lug to move along the slide rail to the designated position; S34. Calculate the total length of the wire rope based on the length from the hook to the four lifting points obtained in step S14. S35, hoisting and installing the arch ribs to be installed.

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