A closure system for main beam of arch tower cable-stayed bridge and construction method thereof

Abstract

The present invention discloses a closure system for the main beam of an arch tower cable-stayed bridge and a construction method thereof, wherein the arch tower is vertically arranged on the middle pier of the cable-stayed bridge, and a support system and a main beam are arranged on both sides of the arch tower; the closure system comprises a pushing device, a horizontal adjustment device, a vertical adjustment device and a guiding device, one end of the horizontal adjustment device is connected to the side of the arch tower, and the other end is connected to the corresponding side surface of the corresponding main beam; one end of the vertical adjustment device is connected to the top of the arch tower, and the other end is connected to the upper end surface of the corresponding main beam; the guiding device is installed in a set on both sides of the closure mouth of the main beam; the pushing device is arranged in the support system and on the top of the piers on the side, and can drive the main beam and the buckle back tower to move as a whole along the longitudinal direction of the support system, so that the left main beam and the right main beam are symmetrically brought close to each other with the arch tower as the center; the coordinated action of the horizontal adjustment device and the vertical adjustment device can drive the end surfaces of the left main beam and the right main beam to align; the guiding device can guide the left main beam and the right main beam to be closure-locked.

Description

[Technical field]

[0001] The invention belongs to the field of bridge engineering, and specifically relates to a main beam closure system and construction method for an arch tower cable-stayed bridge, which can close the main beam with high precision by adopting bidirectional jacking without the need for a guide beam. [Background technology]

[0002] Arch tower cable-stayed bridges are highly competitive when crossing existing roads at small angles and low clearances. The main beams of this type of bridge are usually constructed using methods such as support, jacking, and hoisting. Especially when there is heavy traffic on the road or railway under the bridge, jacking of the main beam becomes the first choice.

[0003] At present, the bidirectional jacking of the main beam usually adopts the jacking-assisted matching and cutting process, that is, the linear shape of the steel beam during the jacking process is adjusted by the jacking equipment and the vertical jack on the auxiliary pier top. After the jacking is in place, the stress-free cutting length of the joint section is calculated, and the factory is matched and prefabricated. At the same time, a traction device is set at the joint mouth to adjust the state of the joint mouth, and the method of adjusting the joint seam width seam by seam is adopted to adjust the joint section position and shape, and weld the joint.

[0004] However, its disadvantage is that the linear shape is difficult to control during the jacking process, especially the lateral correction ability of the curved beam is insufficient; the adjustment requirements for the joint mouth state are high, and there is a lack of active adjustment measures for the matching of the joint joints. The joint section needs to adjust the joint seam width one by one, and the two joints are welded simultaneously, which takes a long time and is difficult to construct; at the same time, after the arch is completed, the hoisting space of the main beam joint section of the arch-tower cable-stayed bridge is limited, and the construction organization is difficult. In addition, the cutting of the joint section changes the size and stress-free linear shape of the components, which has a certain impact on the bridge structure and force, and the quality assurance is low.

[0005] In view of the problems that the main beam line shape is difficult to control during the bidirectional pushing construction of the main beam of the arch tower cable-stayed bridge, especially the insufficient lateral correction ability of the curved beam, the difficulty in adjusting the joint mouth posture, and the lack of active joint mouth adjustment measures, an efficient adjustment system and a high-precision jointing method suitable for the main beam of the arch tower cable-stayed bridge are desired, so as to shorten the construction time, reduce the construction difficulty, and improve the construction quality.

[0006] In view of this, overcoming the defects of the above-mentioned prior art is an urgent problem to be solved in the field of this technology. [Summary of the invention]

[0007] The technical problem to be solved by the present invention is that during the current bidirectional pushing construction of the main beam of the arch tower cable-stayed bridge, the linear shape of the main beam is difficult to control, especially the lateral correction ability of the curved main beam is insufficient, the adjustment of the joint posture is difficult, and there is a lack of active joint adjustment measures.

[0008] The present invention achieves the above object through the following technical solutions:

[0009] In the first aspect, a closure system for the main beam of an arch tower cable-stayed bridge is proposed, wherein the arch tower is vertically arranged on the middle pier of the cable-stayed bridge, and a support system is arranged on the piers on both sides of the arch tower, and the main beam is assembled on the support system. Specifically, the cable-stayed bridge crosses an existing highway or railway line, and the support system is correspondingly distributed on both sides of the existing highway or railway line; the closure system includes a pushing device, a horizontal adjustment device, a vertical adjustment device and a guiding device, and the main beam includes a left main beam and a right main beam arranged on both sides of the arch tower, and each main beam is correspondingly provided with a set of back-fastening towers and back-fastening cables, and the back-fastening towers are vertically arranged on the main beams; the back-fastening cables pass through the top of the back-fastening towers, and both ends are anchored to the inner end faces of the main beams, so that the main beams are hung on the corresponding back-fastening towers; one end of the horizontal adjustment device is connected to the side of the arch tower, and the other end is connected to the corresponding side face of the corresponding main beam; one end of the vertical adjustment device is connected to the top of the arch tower The other end is connected to the upper end face of the corresponding main beam; the guide device is installed as a set on both sides of the main beam joint, specifically on the end side faces of the left main beam and the right main beam close to the arch tower; the pushing device is arranged in the support system and on the pier top of the side pier, which can drive the main beam and the buckle back tower to move as a whole along the longitudinal direction of the support system, so that the left main beam and the right main beam are symmetrically close to each other with the arch tower as the center, the lifting component of the pushing device is arranged under the main beam, and the thrust component of the pushing device is arranged on the pier top of the side pier; the coordinated action of the horizontal adjustment device and the vertical adjustment device can drive the end faces of the left main beam and the right main beam to align, and realize the pushing correction in three dimensions of height, longitudinal angle and rotation angle; the guide device can guide the left main beam and the right main beam to be jointed and locked, that is, the high-precision jointing of the main beam is achieved through the coordinated action of the pushing device, the horizontal adjustment device, the vertical adjustment device and the guide device.

[0010] Furthermore, the transverse adjustment device includes a transverse cable and a transverse cable pulling device; two transverse cable pulling devices are arranged on each side of the arch tower tower root, which are divided into a left transverse cable pulling device and a right transverse cable pulling device, and each transverse cable pulling device is connected to a transverse cable; the transverse cable connects the main beam and the transverse cable pulling device, and the transverse cable can be adjusted when the transverse cable pulling device is in action, and the transverse cable can drive the corresponding main beam to move laterally, thereby adjusting the transverse position of the main beam, specifically, the transverse cable extended from the left transverse cable pulling device on the left arch tower is connected to the left side of the left main beam, and the transverse cable extended from the right transverse cable pulling device on the left arch tower is connected to the left side of the right main beam; the transverse cable extended from the left transverse cable pulling device on the right arch tower is connected to the right side of the left main beam, and the transverse cable extended from the right transverse cable pulling device on the right arch tower is connected to the right side of the right main beam.

[0011] Furthermore, the vertical adjustment device includes a longitudinal cable and a longitudinal cable puller; two longitudinal cable pullers are arranged on each side of the top of the arch tower, which are divided into a left longitudinal cable puller and a right longitudinal cable puller, and each longitudinal cable puller is connected to a longitudinal cable; the longitudinal cable connects the main beam and the longitudinal cable puller, and when the longitudinal cable puller is in motion, the longitudinal cable can be retracted, and the longitudinal cable can drive the corresponding main beam to move up and down, thereby adjusting the height of the main beam, specifically, the longitudinal cable extended from the left longitudinal cable puller on the left arch tower is connected to the left upper end surface of the left main beam, and the longitudinal cable extended from the right longitudinal cable puller on the left arch tower is connected to the left upper end surface of the right main beam; the longitudinal cable extended from the left longitudinal cable puller on the right arch tower is connected to the right upper end surface of the left main beam, and the longitudinal cable extended from the right longitudinal cable puller on the right arch tower is connected to the right upper end surface of the right main beam.

[0012] Furthermore, the pushing device includes a roller and a jack. The roller is placed laterally under the main beam to reduce the movement resistance of the main beam. The jack is set on the top of the side pier to lift the main beam and push the main beam forward.

[0013] Furthermore, the roller is a roller or a ball, and the material of the roller is hard plastic, wood, stone or metal.

[0014] Furthermore, the guide device is a wedge-shaped guide block, including a female guide block and a male guide block arranged in a set; wherein the female guide block is arranged on the end face side of the left main beam by bolt connection or welding, and the male guide block is arranged on the end face side of the right main beam by bolt connection or welding, and the installation positions of the female guide blocks and the male guide blocks in each set of guide blocks correspond to each other, which facilitates the docking between the female guide block and the male guide block.

[0015] Furthermore, the female guide block and the male guide block are separately arranged on the top plate, the web plate and the bottom plate of the main beam.

[0016] Furthermore, the main beam is a steel box beam, a concrete beam or a composite beam.

[0017] Secondly, a construction method for the joint closing system is proposed, wherein the arch tower spans an existing highway or railway line. After the construction of the arch tower is completed, the main beam is assembled on both sides of the existing highway or railway line using a support system, and then pushed toward the middle of the span to close the joint, including the following steps.

[0018] Step 1: Set up the bridge piers and support system to complete the arch tower construction.

[0019] Step 2: Build a left main beam and a right main beam in the middle of the support system on both sides of the arch tower, and build a set of back-fastening towers and back-fastening cables on the left main beam and the right main beam respectively. Specifically, the back-fastening towers and back-fastening cables 7 are temporary construction equipment, which will be removed after a firm inclined cable is set between the main beam and the arch tower. The back-fastening towers and back-fastening cables are used to balance the cantilever weight during the main beam jacking process.

[0020] Step 3: Initially set up the horizontal adjustment device: set up a left-pull horizontal cable device and a right-pull horizontal cable device at the tower root end on the left side of the arch tower, and set up a left-pull horizontal cable device and a right-pull horizontal cable device at the corresponding tower root end on the right side of the arch tower; set up a horizontal cable for each horizontal cable device;

[0021] Step 4: Initially set up the vertical adjustment device: set up a left-pull longitudinal cable device and a right-pull longitudinal cable device at the top of the left tower of the arch tower, and set up a left-pull longitudinal cable device and a right-pull longitudinal cable device at the top of the corresponding tower on the right side of the arch tower, and set up a longitudinal cable for each longitudinal cable device;

[0022] Step 5: Set up the jacking device: Set up a jack on the side pier, lift the main beam with the jack, and place rollers horizontally under the main beam.

[0023] Step six: Set up the guide device: set up multiple sets of guide blocks on the corresponding end faces of the left main beam and the right main beam, set up a female guide block on the end face side of the left main beam close to the arch tower and rigidly fasten it by bolt connection or welding, set up a male guide block on the end face side of the right main beam close to the arch tower and rigidly fasten it by bolt connection or welding; the installation positions of each set of female guide blocks and male guide blocks correspond.

[0024] Step 7: Preliminary jacking of the main beam: Start the jacking device, and use the jack to push the main beam to move longitudinally along the support system, so that the left main beam and the right main beam are symmetrically close to each other with the arch tower as the center. The main beam drives the back tower to move synchronously through the back hook cable to achieve the overall movement of the main beam and the back hook tower. In the process of the left main beam and the right main beam moving symmetrically with the arch tower as the center, the roller at the rear can be moved to the front to ensure that when the main beam moves forward, the rollers are evenly laid under the pressure-bearing surface close to the support system.

[0025] Step 8: Connect the horizontal adjustment device and the vertical adjustment device: When the end face distance between the left main beam and the right main beam is equal to the specified threshold value of 1-50m, the horizontal adjustment device and the vertical adjustment device are fully connected to the main beam, the horizontal cable connects the main beam to the horizontal cable puller, and the longitudinal cable connects the main beam to the longitudinal cable puller, specifically:

[0026] The horizontal cable extending from the left horizontal cable device on the left arch tower is connected to the left side of the left main beam, and the horizontal cable extending from the right horizontal cable device on the left arch tower is connected to the left side of the right main beam; the horizontal cable extending from the left horizontal cable device on the right arch tower is connected to the right side of the left main beam, and the horizontal cable extending from the right horizontal cable device on the right arch tower is connected to the right side of the right main beam;

[0027] The longitudinal cable extending from the left-pull longitudinal cable device on the left arch tower is connected to the left upper end surface of the left main beam, and the longitudinal cable extending from the right-pull longitudinal cable device on the left arch tower is connected to the left upper end surface of the right main beam; the longitudinal cable extending from the left-pull longitudinal cable device on the right arch tower is connected to the right upper end surface of the left main beam, and the longitudinal cable extending from the right-pull longitudinal cable device on the right arch tower is connected to the right upper end surface of the right main beam.

[0028] Step 9: Joint closing and deviation correction: After the left main beam and the right main beam are pushed and translated, the horizontal adjustment device and the vertical adjustment device are started according to the deviation of the height, longitudinal angle and rotation angle between the left main beam and the right main beam to achieve the alignment between the left main beam and the right main beam.

[0029] Step 10: Guide and close the joint: After the left and right main beams are corrected, start the jacking device to continue to symmetrically move the left and right main beams together with the arch tower as the center, and correct the joints step by step according to step 9 in a timely manner, repeatedly adjust the jacking device, horizontal adjustment device and vertical adjustment device until the friendly docking of the female guide block and the male guide block is achieved. When all the male guide blocks are embedded in the female guide blocks, it is determined that the longitudinal and lateral corrections have been completed, and then use the jacking device to achieve tight connection of the main beams on both sides.

[0030] Step 11: Locking the joint mouth: Lock the joint mouth through connecting plates and bolts, and then weld the joints one by one to complete the rigid joint.

[0031] Step 12: Finishing of the project: Hang the main beam on the arch tower through the cable-stayed cable. After the arch tower cable-stayed bridge structure is stable, remove the jacking device, horizontal adjustment device, vertical adjustment device, back-fastening tower, back-fastening cable and support system according to the correct procedure and proceed to the next step.

[0032] Furthermore, in the above steps, the horizontal cable puller and the longitudinal cable puller act alternately when exerting force, and the power of each device should be appropriately adjusted according to the target moving position to prevent damage caused by inertial impact of the equipment due to excessive force.

[0033] Compared with the prior art, the present invention has the following advantages.

[0034] 1. Use the horizontal adjustment device, vertical adjustment device and jacking device of the arch tower cable-stayed bridge to push and correct the main beams on both sides, roughly adjust the posture of the joints of the main beams on both sides, and use the wedge-shaped guide blocks of the joints to achieve high-precision docking and jointing of the two main beams.

[0035] 2. This closure method does not require the setting of temporary structures such as closure counterweights and closure rigid frames, and has a simple structure and saves construction costs. The horizontal adjustment device and the vertical adjustment device improve the efficiency of the main beam linear adjustment and have good adaptability to the lateral displacement adjustment of the curved main beam. The wedge-shaped guide device at the closure actively adjusts the closure surface posture to achieve high-precision docking, reduce manual intervention, and has a single construction control factor, simple construction, and improved work efficiency.

[0036] 3. The horizontal adjustment device and the vertical adjustment device are arranged on the arch tower, which can provide pulling force to assist the jacking device to pull the left main beam and the right main beam toward the arch tower at the same time, further improving the jacking translation efficiency.

Brief Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a three-dimensional view of the main beam of the cable-stayed bridge in this embodiment after being equipped with a jacking device and before being closed.

[0039] Figure 2 This is a stereoscopic view of the left main beam and the right main beam in this embodiment before being connected after being pushed toward the arch tower by the jacking device and configured with the horizontal adjustment device, the vertical adjustment device and the guide device.

[0040] Figure 3 This is an enlarged stereoscopic view of the middle part of the left main beam and the right main beam in this embodiment before being connected after being pushed toward the arch tower by the jacking device and configured with the horizontal adjustment device, the vertical adjustment device and the guide device.

[0041] Figure 4 It is a front view of the left main beam and the right main beam in this embodiment before being connected after being pushed toward the arch tower by the jacking device and configured with the horizontal adjustment device, the vertical adjustment device and the guide device.

[0042] Figure 5 This is a left view of the left main beam and the right main beam in this embodiment before they are connected after being pushed toward the arch tower by the jacking device and configured with the horizontal adjustment device, the vertical adjustment device and the guide device.

[0043] Figure 6 This is a top view of the left main beam and the right main beam in this embodiment before being connected after being pushed toward the arch tower by the jacking device and configured with the horizontal adjustment device, the vertical adjustment device and the guide device.

[0044] Figure 7 This is a three-dimensional view of the left main beam, the right main beam and the guide device in this embodiment when they are isolated before being connected.

[0045] Figure 8 This is a three-dimensional diagram of the left main beam and the right main beam after they are connected.

[0046] Fig. 9 This is a partially enlarged stereoscopic view after the left main beam and the right main beam in this embodiment are connected.

[0047] In the figure: 1- bracket system; 5- guide device; 6- buckle back tower; 7- buckle back rope; 201- roller device; 301- horizontal cable; 302- horizontal cable pulling device; 401- longitudinal cable; 402- longitudinal cable pulling device; 501- female guide block; 502- male guide block. [Specific implementation method]

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0050] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0051] Embodiment 1: as Figure 1-9 As shown, an embodiment of the present invention constructs a closure system for the main beam of an arch tower cable-stayed bridge, wherein the arch tower is vertically arranged on the middle pier of the cable-stayed bridge, and a support system 1 is arranged on the piers on both sides of the arch tower, and the main beam is assembled on the support system 1. Specifically, the cable-stayed bridge crosses an existing highway or railway line, and the support system 1 is correspondingly distributed on both sides of the existing highway or railway line; the closure system includes a jacking device, a horizontal adjustment device, a vertical adjustment device and a guide device 5, and the main beam includes a left main beam and a right main beam arranged on both sides of the arch tower, and each main beam is correspondingly provided with a set of back-fastening towers 6 and back-fastening cables 7, and the back-fastening towers 6 are vertically arranged on the main beam; the back-fastening cables 7 pass through the top of the back-fastening towers 6, and both ends are anchored to the inner end faces of the main beam, so that the main beam is hung on the corresponding back-fastening towers 6; one end of the horizontal adjustment device is connected to the side of the arch tower, and the other end is connected to the corresponding side of the corresponding main beam; one end of the vertical adjustment device is connected to At the top of the arch tower, the other end is connected to the upper end face of the corresponding main beam; the guide device 5 is installed as a set on both sides of the main beam joint, specifically on the end side faces of the left and right main beams close to the arch tower; the jacking device is arranged in the support system and on the top of the side piers, which can drive the main beam and the buckle back tower 6 to move as a whole along the longitudinal direction of the support system 1, so that the left and right main beams are symmetrically close to each other with the arch tower as the center, the lifting component of the jacking device is arranged under the main beam, and the thrust component of the jacking device is arranged on the top of the side pier; the coordinated action of the horizontal adjustment device and the vertical adjustment device can drive the end faces of the left and right main beams to align, and realize the jacking correction in three dimensions of height, longitudinal angle and rotation angle; the guide device 5 can guide the left and right main beams to be jointed and locked, that is, the high-precision jointing of the main beams is achieved through the coordinated action of the jacking device, the horizontal adjustment device, the vertical adjustment device and the guide device 5.

[0052] In this embodiment, the horizontal adjustment device includes a horizontal cable 301 and a horizontal cable pulling device 302; two horizontal cable pulling devices 302 are arranged on each side of the arch tower tower, which are divided into a left horizontal cable pulling device 302 and a right horizontal cable pulling device 302, each horizontal cable pulling device 302 is connected to a horizontal cable 301, and the horizontal cable 301 connects the main beam and the horizontal cable pulling device 302. When the horizontal cable pulling device 302 is activated, the horizontal cable 301 can be adjusted, and the horizontal cable 301 can drive the corresponding main beam to move horizontally. Move to adjust the lateral position of the main beam, specifically, the transverse cable 301 extended from the left-pull transverse cable device 302 on the left arch tower is connected to the left side of the left main beam, and the transverse cable 301 extended from the right-pull transverse cable device 302 on the left arch tower is connected to the left side of the right main beam; the transverse cable 301 extended from the left-pull transverse cable device 302 on the right arch tower is connected to the right side of the left main beam, and the transverse cable 301 extended from the right-pull transverse cable device 302 on the right arch tower is connected to the right side of the right main beam.

[0053] In this embodiment, the vertical adjustment device includes a longitudinal cable 401 and a longitudinal cable puller 402; two longitudinal cable pullers 402 are arranged on each side of the top of the arch tower, which are divided into a left longitudinal cable puller 402 and a right longitudinal cable puller 402, and each longitudinal cable puller 402 is connected to a longitudinal cable 401; the longitudinal cable 401 connects the main beam and the longitudinal cable puller 402, and when the longitudinal cable puller 402 is actuated, the longitudinal cable 401 can be retracted, and the longitudinal cable 401 can drive the corresponding main beam to move up and down, thereby To adjust the height of the main beam, specifically, the longitudinal cable 401 extending from the left longitudinal cable device 402 on the left arch tower is connected to the left upper end face of the left main beam, and the longitudinal cable 401 extending from the right longitudinal cable device 402 on the left arch tower is connected to the left upper end face of the right main beam; the longitudinal cable 401 extending from the left longitudinal cable device 402 on the right arch tower is connected to the right upper end face of the left main beam, and the longitudinal cable 401 extending from the right longitudinal cable device 402 on the right arch tower is connected to the right upper end face of the right main beam;

[0054] In this embodiment, the pushing device includes a roller 201 and a jack. The roller 201 is placed horizontally under the main beam to reduce the movement resistance of the main beam. The jack is set on the top of the side pier to lift the main beam and push the main beam forward.

[0055] In this embodiment, the roller 201 is a roller, and the material of the roller 201 is hard wood.

[0056] In this embodiment, the guide device 5 is a wedge-shaped guide block, including a set of female guide blocks 501 and male guide blocks 502; wherein the female guide block 501 is connected to the end face side of the left main beam by bolts, and the male guide block 502 is connected to the end face side of the right main beam by bolts, and the installation positions of the female guide blocks 501 and the male guide blocks 502 in each set of guide blocks correspond to each other, which facilitates the docking between the female guide blocks 501 and the male guide blocks 502.

[0057] In this embodiment, the female guide block 501 and the male guide block 502 are separately arranged on the top plate, the web plate and the bottom plate of the main beam.

[0058] In this embodiment, the main beam is a steel box beam, a concrete beam or a composite beam.

[0059] Example 2: After providing a joint closing system for the main beam of an arch tower cable-stayed bridge as described in Example 1, an embodiment of the present invention further provides a construction method for the joint closing system for the main beam of an arch tower cable-stayed bridge. The joint closing system constructed in this embodiment can directly utilize the one introduced in Example 1.

[0060] In this embodiment, a construction method for a main beam closure system for an arch tower cable-stayed bridge is provided, wherein the arch tower spans an existing highway or railway line. After the construction of the arch tower is completed, the main beam is assembled on both sides of the existing highway or railway line using a support system 1, and then pushed toward the middle of the span to be closed, including the following steps.

[0061] Step 1: Set up the bridge piers and support system 1 to complete the arch tower construction.

[0062] Step 2: Build a left main beam and a right main beam in the middle of the support system 1 on both sides of the arch tower, respectively. The left main beam and the right main beam are both 80m long and 20m wide. Build a set of back-fastening towers 6 and back-fastening cables 7 on the left main beam and the right main beam respectively. Specifically, the back-fastening towers 6 and back-fastening cables 7 are temporary construction equipment, which will be removed after a firm inclined cable is set between the main beam and the arch tower. The back-fastening towers 6 and back-fastening cables 7 are used to balance the cantilever weight during the main beam jacking process; specifically, the arch tower is 80m high, 50m wide, and 5m thick, and the back-fastening tower 6 is 50m high and 30m wide.

[0063] Step 3: Initially set up the transverse adjustment device: set a left-pull transverse cable 302 and a right-pull transverse cable 302 at the tower root end on the left side of the arch tower, and set a left-pull transverse cable 302 and a right-pull transverse cable 302 at the corresponding tower root end on the right side of the arch tower; each transverse cable 302 is provided with a transverse cable 301.

[0064] Step 4: Initially set up the vertical adjustment device: set a left-pull longitudinal cable device 402 and a right-pull longitudinal cable device 402 at the top of the left tower of the arch tower, set a left-pull longitudinal cable device 402 and a right-pull longitudinal cable device 402 at the corresponding top of the right tower of the arch tower, and set a longitudinal cable 401 for each longitudinal cable device 402.

[0065] Step 5: Setting up the jacking device: Setting up a jack on the side pier, jacking up the main beam and the buckle back tower 6 by the jack, and placing a roller 201 horizontally under the main beam and the buckle back tower 6.

[0066] Step six: Set up the guide device 5: Set up multiple sets of guide blocks on the corresponding end faces of the left main beam and the right main beam, set up a female guide block 501 on the end face side of the left main beam close to the arch tower and rigidly fasten it by bolt connection, set up a male guide block 502 on the end face side of the right main beam close to the arch tower and rigidly fasten it by bolt connection; the installation positions of each set of female guide blocks 501 and male guide blocks 502 correspond.

[0067] Step seven: Preliminary jacking of the main beam: Start the jacking device, and use the jack to push the main beam to move longitudinally along the support system 1, so that the left main beam and the right main beam are symmetrically brought together with the arch tower as the center, wherein the main beam drives the back tower 6 to move synchronously via the back hook cable 7, so as to realize the overall movement of the main beam and the back hook tower 6; in the process of the left main beam and the right main beam symmetrically approaching the arch tower as the center, the roller 201 at the rear can be moved to the front, so as to ensure that when the main beam moves forward, the roller 201 is evenly laid under the pressure-bearing surface close to the support system 1.

[0068] Step 8: Connect the horizontal adjustment device and the vertical adjustment device: When the end distance between the left main beam and the right main beam is equal to the specified threshold value of 30m, the horizontal adjustment device and the vertical adjustment device are completely connected to the main beam, the horizontal cable 301 connects the main beam and the horizontal cable puller 302, and the longitudinal cable 401 connects the main beam and the longitudinal cable puller 402, specifically:

[0069] The transverse cable 301 extending from the left-pull transverse cable device 302 on the left arch tower is connected to the left side of the left main beam, and the transverse cable 301 extending from the right-pull transverse cable device 302 on the left arch tower is connected to the left side of the right main beam; the transverse cable 301 extending from the left-pull transverse cable device 302 on the right arch tower is connected to the right side of the left main beam, and the transverse cable 301 extending from the right-pull transverse cable device 302 on the right arch tower is connected to the right side of the right main beam.

[0070] The longitudinal cable 401 extending from the left-pull longitudinal cable device 402 on the left arch tower is connected to the left upper end surface of the left main beam, and the longitudinal cable 401 extending from the right-pull longitudinal cable device 402 on the left arch tower is connected to the left upper end surface of the right main beam; the longitudinal cable 401 extending from the left-pull longitudinal cable device 402 on the right arch tower is connected to the right upper end surface of the left main beam, and the longitudinal cable 401 extending from the right-pull longitudinal cable device 402 on the right arch tower is connected to the right upper end surface of the right main beam.

[0071] Step 9: Correction of joint closing: After the left main beam and the right main beam are pushed and translated, the following corrections need to be performed during the joint closing process:

[0072] First, the end surfaces of the left main beam and the right main beam at the joint surface are horizontal but uneven, and there is a height difference. According to this height difference, the longitudinal cable pulling device 402 is started to reduce the height difference between the left main beam and the right main beam through the vertical adjustment device;

[0073] Second: the end faces of the joint surface of the left main beam and the right main beam are neat but not level in the longitudinal angle. According to this longitudinal angle, the longitudinal cable puller 402 is started and the buckle back cable 7 is properly adjusted to ensure that the bridge deck of the left main beam and the right main beam is level;

[0074] Third: the distance between the end faces on one side of the joint surface of the left main beam and the right main beam is not equal to the distance between the end faces on the opposite side, forming a V-shaped crack. According to this situation, the horizontal cable pulling device 302 is started to eliminate the V-shaped crack through the horizontal adjustment device to achieve longitudinal alignment;

[0075] Fourth: there is a lateral angle in the end face twisting at the joint surface of the left main beam and the right main beam; according to this situation, the longitudinal cable pulling device 402 is started, and the height of the left and right sides of the main beam is adjusted through the vertical adjustment device to maintain the lateral level between the left and right main beams.

[0076] Step 10: Guide and join: After the left and right main beams are corrected, start the jacking device to continue to symmetrically move the left and right main beams together with the arch tower as the center, and correct the deviation step by step according to step 9 in a timely manner, repeatedly adjust the jacking device, the horizontal adjustment device and the vertical adjustment device until the friendly docking of the female guide block 501 and the male guide block 502 is achieved. When all the male guide blocks 502 are embedded in the female guide blocks 501, it is determined that the longitudinal and lateral corrections have been completed, and then the jacking device is used to achieve tight jointing of the main beams on both sides.

[0077] Step 11: Locking the joint mouth: Lock the joint mouth through connecting plates and bolts, and then weld the joints one by one to complete the rigid joint.

[0078] Step 12: Finishing of the project: Hang the main beam on the arch tower through the cable-stayed cable. After the arch tower cable-stayed bridge structure is stable, remove the jacking device, horizontal adjustment device, vertical adjustment device, back-fastening tower, back-fastening cable and support system 1 according to the correct procedure and proceed to the next step.

[0079] It is further explained that during construction, the horizontal cable puller 302 and the longitudinal cable puller 402 act alternately when exerting force, and the power of each device should be appropriately adjusted according to the target moving position to prevent damage caused by inertial impact of the equipment due to excessive force.

[0080] Furthermore, in the embodiment, the size and structural strength of the corresponding components of the pushing device, horizontal adjustment device, vertical adjustment device and guide device 5 are related to the size and weight of the main beam. During the design, it is ensured that the pushing device, horizontal adjustment device, vertical adjustment device and guide device 5 have sufficient strength to support the translation, fixation and adjustment of the main beam, retaining a 100% safety margin, thereby avoiding the risk of damage caused by sudden stress changes due to shaking or impact during operation in the embodiment.

[0081] The invention can be applied to the design and construction of cross-line arch tower cable-stayed bridges and has good prospects for promotion and application.

[0082] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A closure system for the main beam of an arch tower cable-stayed bridge, wherein the arch tower is vertically arranged on the middle pier of the cable-stayed bridge, and a support system (1) is arranged on the piers on both sides of the arch tower, and the main beam is assembled on the support system (1), characterized in that: The joint closing system comprises a pushing device, a horizontal adjustment device, a vertical adjustment device and a guiding device (5). The main beam comprises a left main beam and a right main beam arranged on both sides of the arch tower. Each main beam is provided with a set of back-fastening towers (6) and back-fastening cables (7). The back-fastening towers (6) are vertically arranged on the main beam; the back-fastening cables (7) pass through the top of the back-fastening towers (6) and are anchored at both ends to the inner end faces of the main beam, thereby hanging the main beam on the corresponding back-fastening towers (6). One end of the horizontal adjustment device is connected to the side of the arch tower and the other end is connected to the corresponding side face of the corresponding main beam. One end of the vertical adjustment device is connected to the top of the arch tower and the other end is connected to the upper end face of the corresponding main beam. The guiding device (5) is installed as a set on both sides of the joint closing mouth of the main beam. The pushing device is longitudinally arranged in the support system and on the top of the side piers and abuts against the main beam and the back-fastening towers. The guiding device (5) guides the left main beam and the right main beam to be jointed and locked.

2. The closure system according to claim 1, characterized in that: The transverse adjustment device comprises a transverse cable (301) and a transverse cable pulling device (302). Two transverse cable pulling devices (302) are arranged on each side of the tower base of the arch tower, which are divided into a left transverse cable pulling device (302) and a right transverse cable pulling device (302). Each transverse cable pulling device (302) is connected to a transverse cable (301). The transverse cable (301) connects the main beam and the transverse cable pulling device (302). When the transverse cable pulling device (302) is in motion, the transverse cable (301) can be adjusted. The transverse cable (301) can drive the corresponding main beam to move transversely, thereby adjusting the transverse position of the main beam.

3. The closure system according to claim 2, characterized in that: The vertical adjustment device comprises a longitudinal cable (401) and a longitudinal cable puller (402). Two longitudinal cable pullers (402) are arranged on each side of the top of the arch tower, which are divided into a left longitudinal cable puller (402) and a right longitudinal cable puller (402). Each longitudinal cable puller (402) is connected to a longitudinal cable (401). The longitudinal cable (401) connects the main beam and the longitudinal cable puller (402). When the longitudinal cable puller (402) is in motion, the longitudinal cable (401) can be retracted, and the longitudinal cable (401) drives the corresponding main beam to move up and down, thereby adjusting the height of the main beam.

4. The closure system according to claim 3, characterized in that: A roller (201) is placed under the left main beam and the right main beam. The roller (201) is a roller or a ball. The material of the roller (201) is hard plastic, wood, stone or metal.

5. The closure system according to claim 4, characterized in that: The guide device (5) is a wedge-shaped guide block, comprising a set of female guide blocks (501) and male guide blocks (502); wherein the female guide block (501) is arranged on the end face side of the left main beam by bolt connection or welding, and the male guide block (502) is arranged on the end face side of the right main beam by bolt connection or welding. The installation positions of the female guide blocks (501) and the male guide blocks (502) in each set of guide blocks correspond to each other, so as to facilitate docking between the female guide blocks (501) and the male guide blocks (502).

6. The closure system according to claim 5, characterized in that: The female guide block (501) and the male guide block (502) are separately arranged on the top plate, the web plate and the bottom plate of the main beam.

7. The closure system according to claim 6, characterized in that: The main beam is a steel box beam, a concrete beam or a composite beam.

8. A construction method for the closure system according to claim 7, characterized in that: The arch tower crosses an existing highway or railway line. After the construction of the arch tower is completed, the main beam is assembled on both sides of the existing highway or railway line using a bracket system (1), and then pushed toward the middle of the span until it is closed, including the following steps: Step 1: Set up the bridge piers and support system (1) and complete the arch tower construction; Step 2: Build a left main beam and a right main beam in the middle of the support system (1) on both sides of the arch tower, and build a set of back-fastening towers (6) and back-fastening cables (7) on the left main beam and the right main beam respectively; Step 3: Initially set up the transverse adjustment device: set up a left-pull transverse cable device (302) and a right-pull transverse cable device (302) at the tower root end on the left side of the arch tower, and set up a left-pull transverse cable device (302) and a right-pull transverse cable device (302) at the corresponding tower root end on the right side of the arch tower; each transverse cable device (302) is provided with a transverse cable (301); Step 4: Preliminary vertical adjustment device: a left-pull longitudinal cable device (402) and a right-pull longitudinal cable device (402) are set at the top of the left side of the arch tower, and a left-pull longitudinal cable device (402) and a right-pull longitudinal cable device (402) are set at the top of the corresponding tower on the right side of the arch tower, and each longitudinal cable device (402) is provided with a longitudinal cable (401); Step 5: Setting a jacking device: Setting a jack on the side pier, jacking up the main beam by the jack, and placing a roller (201) horizontally under the main beam; Step 6: Setting a guide device (5): Setting a plurality of guide blocks on the corresponding end faces of the left main beam and the right main beam, setting a female guide block (501) on the end face side of the left main beam close to the arch tower and rigidly fastening it by bolt connection or welding, and setting a male guide block (502) on the end face side of the right main beam close to the arch tower and rigidly fastening it by bolt connection or welding; the installation positions of each set of female guide blocks (501) and male guide blocks (502) correspond to each other; Step 7: Preliminary jacking of the main beam: Start the jacking device, and push the main beam to move longitudinally along the support system (1) by means of the jack, so that the left main beam and the right main beam are symmetrically brought together with the arch tower as the center, wherein the main beam drives the back tower (6) to move synchronously via the back-fastening cable (7), so that the main beam and the back-fastening tower (6) can move as a whole; while the left main beam and the right main beam are symmetrically brought together with the arch tower as the center, the roller (201) at the rear is moved to the front, so as to ensure that when the main beam moves forward, the roller (201) is evenly laid under the pressure-bearing surface close to the support system (1); Step 8: Connecting the horizontal adjustment device and the vertical adjustment device: When the end face distance between the left main beam and the right main beam is equal to the specified threshold, the horizontal cable (301) connects the main beam to the horizontal cable puller (302), and the longitudinal cable (401) connects the main beam to the longitudinal cable puller (402); Step 9: closing and correcting: after the left main beam and the right main beam are pushed and translated, according to the deviation of the height, longitudinal angle and rotation angle between the left main beam and the right main beam, the horizontal adjustment device and the vertical adjustment device are started to realize the alignment between the left main beam and the right main beam; Step 10: Guide and close the joint: After the left main beam and the right main beam are corrected, the jacking device is started to continue to symmetrically move the left main beam and the right main beam closer with the arch tower as the center, and the jacking and correcting are gradually performed according to step 9 in a timely manner, and the jacking device, the horizontal adjustment device and the vertical adjustment device are repeatedly adjusted until the female guide block (501) and the male guide block (502) are connected in a friendly manner. When all the male guide blocks (502) are embedded in the female guide block (501), it is determined that the longitudinal correction and the lateral correction have been completed, and then the jacking device is used to close the main beams on both sides; Step 11: Locking the closure: Lock the closure by connecting plates and bolts, and then weld the joints one by one to complete the rigid closure; Step 12: Finishing the project: Hang the main beam on the arch tower through the cable-stayed cable. After the arch tower cable-stayed bridge structure is stable, remove the jacking device, horizontal adjustment device, vertical adjustment device, back-fastening tower, back-fastening cable and support system (1) according to the correct process and proceed to the next process.

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