A beam vertical rotation system for an arch tower cable-stayed bridge and a construction method thereof

Abstract

The present invention discloses a beam vertical rotation system and a construction method thereof for an arch tower cable-stayed bridge. The arch tower cable-stayed bridge comprises a bridge tower, a main beam and a beam segment. The bridge tower is an arch bridge tower, which is formed by splicing two symmetrical side towers on the left and right. A beam segment is arranged on each side tower and connected to the main beam, so as to improve the lateral force and stability of the main beam. The vertical load of the main beam is transmitted to the bridge tower through the inclined cable. Wedge blocks are arranged on both sides of the main beam. The beam vertical rotation system comprises a locking device and a vertical rotation device. The beam segment is a rectangular parallelepiped structure, and the upper end body is adapted to the wedge block on the main beam. The locking device cooperates with the vertical rotation device to first fix the beam segment on the inner side of the side tower. After the bridge tower and the main beam are built, the upper end height of the beam segment can be adjusted, and the upper end of the beam segment can be vertically rotated to the lateral wedge block of the main beam, so as to connect the main beam and the beam as a whole. The system and the construction method of the present invention do not affect the operation of the existing line, save space and reduce the cost.

Description

[Technical field]

[0001] The invention belongs to the field of bridge engineering, and in particular relates to a beam vertical rotation system for an arch tower cable-stayed bridge and a construction method thereof. [Background technology]

[0002] With the development of my country's economy and society, more and more arch-tower cable-stayed bridges are used as cross-line bridges. Especially when there is heavy traffic on the road or railway under the bridge, ensuring smooth traffic and safety during construction has become the primary problem in bridge construction.

[0003] Arch-tower cable-stayed bridges are highly competitive when crossing existing roads at small angles and low clearances. This type of bridge is constructed after the main bridge arch forms a stable structure, usually by bracket assembly or installation by truck crane. Bracket assembly of the beam requires road closure and occupation, which affects traffic, while truck cranes face problems such as limited space for beam hoisting after the arch is formed, site restrictions on the hoisting route, difficulty in correcting and adjusting the beam during hoisting, and greater construction difficulty. Especially when the road or railway under the bridge is busy, ensuring smooth traffic and safety during construction has become the primary problem in bridge construction.

[0004] 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]

[0005] The technical problem to be solved by the present invention is: in view of the fact that the assembly of the beam bracket of the arch tower cable-stayed bridge currently requires road closure and occupation, which affects traffic, and the lifting by a car crane is restricted by the site, and the lifting space of the beam after the arch is formed is limited, and the construction is difficult; how to effectively reduce the impact of the existing traffic under the bridge when building the beam segment, reduce the construction difficulty, shorten the construction period, and save the cost.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions.

[0007] In the first aspect, the present invention proposes a beam vertical rotation system for an arch-tower cable-stayed bridge, wherein the arch-tower cable-stayed bridge comprises a bridge tower, a main beam and a beam segment, wherein the bridge tower is an arch-shaped bridge tower, which is formed by splicing two symmetrical side towers on the left and right, and the bridge tower lifts the main beam through inclined cables; wedge blocks are arranged on both sides of the main beam; a beam segment is arranged on each side tower, and the beam vertical rotation system comprises a locking device and a vertical rotation device for adjusting the height of the upper end of the beam segment so that the upper end of the beam segment can be vertically rotated to the transverse wedge block of the main beam, wherein the beam segment is a rectangular structure, and the upper end shape is adapted to the wedge block on the main beam; the locking device locks the upper end of the beam segment to the inner side of the side tower; and the vertical rotation device hinges the lower end of the beam segment to the inner side of the side tower.

[0008] Furthermore, the locking device includes a locking hinge, a steel hinge wire or a steel rod, and a rubber gasket; the locking hinge is installed at the upper end of the beam segment, and the side tower is provided with a locking hole corresponding to the locking hinge; the rubber gasket is arranged between the beam segment and the side tower; the steel hinge wire or the steel rod can bind the beam segment to the side tower.

[0009] Furthermore, the locking hinge includes a lock handle, a lock column and a lock head, the lock handle is fixed to the upper end of the beam segment; the entrance of the locking hole is adapted to the shape and position of the lock head, the bottom end of the locking hole is provided with a lock slot for hanging the lock head, and the lock handle is provided with a vertical rotation motor that can drive the lock column and the lock head to rotate as a whole so that the lock head can be inserted into or exited from the lock slot.

[0010] Furthermore, the vertical rotation device includes a vertical rotation hinge, a vertical rotation cable and a cable machine; the vertical rotation hinge is installed at the lower end of the beam segment, and a vertical rotation platform corresponding to the vertical rotation hinge is provided at a designated position of the side tower, and the vertical rotation hinge hinges the lower end of the beam segment to the vertical rotation platform; the cable machine is installed on the side tower and is used to gather or loosen the vertical rotation cable; one end of the vertical rotation cable is connected to the upper end of the beam segment, and the other end is connected to the cable machine; the cable machine vertically rotates the upper end of the beam segment to the transverse wedge block of the main beam through the vertical rotation cable.

[0011] Furthermore, a position sensor is provided on the vertical rotation platform, which is connected to the monitoring center through a signal line to monitor the vertical rotation state of the beam segment; a tension sensor is provided on the lock head and the vertical rotation cable, which is connected to the monitoring center through a signal line to monitor the stress state of the lock head and the vertical rotation cable.

[0012] Furthermore, a patching section or a welded seam is provided between the cross beam segment and the wedge block of the main beam to realize a rigid connection; the vertical turntable hangs the lower end of the cross beam segment, and a patching section or a welded seam is provided between the cross beam segment and the vertical turntable to realize a rigid connection.

[0013] Furthermore, the patching section includes a rigid connecting plate and bolts.

[0014] In a second aspect, the present invention provides a construction method for a beam vertical rotation system for an arch tower cable-stayed bridge, using the beam vertical rotation system proposed in the first aspect, and the specific implementation steps are as follows:

[0015] Step 1: Set up the bridge piers and support system according to the design drawing requirements, and use the horizontal splicing method to make the side towers and beam segments under the support of the piers and supports, where the beam segments are placed along the height direction of the side towers.

[0016] Step 2: Install the locking device: A vertically rotatable sleeve locking hinge is installed at the upper end of the beam segment, and a locking hole corresponding to the locking hinge is set at the specified position of the side tower.

[0017] Step 3: Install the vertical rotation device: weld the vertical rotation hinge at the lower end of the beam segment, set a vertical rotation platform corresponding to the vertical rotation hinge at the specified position of the side tower, and set a cable puller at the specified position of the side tower.

[0018] Step 4: Hinge the vertical hinge at the lower end of the beam segment to the vertical rotating platform, set multiple rubber gaskets between the beam segment and the side tower, bind the beam segment to the side tower through steel strands or steel rods, further tighten the steel strands or steel rods upward to make the upper end of the beam segment further rotate vertically upward until the locking hinge is inserted into the locking hole. The lock handle can be rotated vertically in the forward direction to hang the lock head into the lock slot, and the rubber gasket is inserted into the remaining gap between the beam segment and the side tower.

[0019] Step 5: Set a position sensor on the vertical rotation platform, and connect the signal directly to the monitoring center to monitor the vertical rotation status of the beam segment; set tension sensors on the lock head and the vertical rotation cable respectively, and connect the signal directly to the monitoring center.

[0020] Step 6: Vertical rotation of the beam: Wait for the left and right side spans, main beams and cross beam segments to be constructed as required, rotate the two side towers vertically and then horizontally to form a complete arch span bridge tower. After the bridge tower and the main beam are connected to form a cable-stayed bridge through inclined cables, start the winch at low power, slightly retract the vertical rotation cable to lift the cross beam segment to facilitate the release of the locking hinge, reverse the vertical rotation lock handle to disengage the lock head from the lock slot, and then release the steel hinge wire or steel rod.

[0021] Step seven: Control the winch to slowly release the vertical rotation cable. Under the gravity of the beam segment, the upper end of the beam segment rotates vertically downward with the vertical rotation hinge as the center, and the rubber gasket is gradually removed until the lower end surface of the beam segment is squeezed onto the vertical rotation platform. The vertical rotation platform hangs the lower end of the beam segment. At this time, the upper end of the beam segment has been placed on the transverse wedge block of the main beam. The monitoring center reduces the power of the winch to shut down according to the position sensor signal; during the construction process, the monitoring center monitors the stress state of the lock and the vertical rotation cable according to the tension sensor to ensure that the bridge tower and the beam segment are firmly connected.

[0022] Step 8: After the cross beam segment and the main beam are successfully spliced, a patching section or a welded seam is set between the cross beam segment and the main beam to achieve a rigid connection; a patching section or a welded seam is set between the cross beam segment and the vertical turntable to achieve a rigid connection. After the cable-stayed bridge forms a stable structure, the locking device and the vertical turntable are removed, and the next step is carried out according to the specific project.

[0023] Compared with the prior art, the present invention has the following advantages.

[0024] 1. The side towers and beam segments are horizontally spliced ​​under the support of piers and brackets and are manufactured at the same stage, so that the beam segments can be bound to the bridge towers before the main towers are vertically rotated. After the side towers form a stable structure, the beams can be vertically rotated into place without the need to set up a separate platform for making and hoisting the beam segments. The corresponding construction method avoids the impact of bracket construction on existing lines when setting up a separate platform, and avoids the problems of insufficient operating space for heavy cranes and great construction difficulty.

[0025] 2. Through the coordination between the locking device and the vertical rotation device, the beam segment can be vertically rotated into place at one time under the action of its own weight. The construction control factor is single, which avoids construction difficulties such as insufficient lateral correction measures and effectively improves the construction quality.

[0026] 3. The cross beam segments are hung by wedge blocks and vertical turntables, and the cross beam segments are rigidly connected between the main beam and the bridge tower by setting patching sections or welding seams, which improves the safety of the construction process and ensures the overall mechanical strength after completion.

[0027] 4. The locking device can ensure that the shaking and impact during the vertical rotation and splicing of the side towers into the arch towers will not cause the beam segments to shift or fall off. When the side towers are vertically rotated to the specified position to form a stable arch tower, the arch tower is basically in a static state and the beam segments and the arch tower are integrated; even if there is wind, the vertical rotation device can still ensure that the beam segments and the arch tower shake synchronously. There is no need to add a stabilizing device, and the vertical rotation and precise docking of the beam segments can be easily completed.

Brief Description of the Drawings

[0028] 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.

[0029] Figure 1 It is a stereoscopic view before the crossbeam is vertically rotated in an embodiment of the present invention.

[0030] Figure 2 It is a three-dimensional diagram of the main beam when it is isolated in an embodiment of the present invention.

[0031] Figure 3 It is a stereoscopic diagram of an isolated beam segment in an embodiment of the present invention.

[0032] Figure 4 It is a three-dimensional diagram of the locking hinge in an embodiment of the present invention when isolated.

[0033] Figure 5 For the embodiment of the present invention Figure 1 The middle dotted box A - a partially enlarged stereoscopic screenshot of the crossbeam segment before the crossbeam is rotated vertically.

[0034] Figure 6 For the embodiment of the present invention Figure 1 The middle dotted box A - a partially enlarged three-dimensional cross-sectional screenshot of the crossbeam segment before the crossbeam is rotated vertically.

[0035] Figure 7 It is a three-dimensional diagram of the cross beam after vertical rotation in the embodiment of the present invention.

[0036] Figure 8 For the embodiment of the present invention Figure 7 The middle dotted box B - an enlarged left-view stereoscopic screenshot of a partial section of the beam after the beam is rotated vertically.

[0037] Fig. 9 For the embodiment of the present invention Figure 7 The middle dotted box B - an enlarged stereoscopic screenshot of the partial right view of the beam segment after the beam is rotated vertically.

[0038] In the figure: 1-bridge tower; 2-main beam; 3-cross beam segment; 4-locking device; 5-vertical rotation device; 101-locking hole; 102-locking slot; 103-vertical rotation platform; 201-wedge block; 401-locking hinge; 402-steel hinge wire; 403-locking handle; 404-locking column; 405-locking head; 501-vertical rotation hinge; 502-vertical rotation cable; 503-cable pulling machine. [Specific implementation method]

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Embodiment 1: The embodiment of the present invention provides a beam vertical rotation system for an arch tower cable-stayed bridge, such as Figure 1-9As shown, the arch-tower cable-stayed bridge includes a bridge tower 1, a main beam 2 and a cross beam segment 3. The bridge tower 1 is an arch-shaped bridge tower, which is spliced ​​by two symmetrical side towers on the left and right. The bridge tower 1 can lift the main beam 2 through a cable; wedge blocks 201 are arranged on both sides of the main beam 2; a cross beam segment 3 is arranged on each side tower, and the side tower and the cross beam segment 3 are made by a horizontal splicing method under the support of bridge piers and brackets.

[0043] The beam vertical rotation system includes a locking device 4 and a vertical rotation device 5. The beam segment 3 is a rectangular parallelepiped structure, and the upper end shape is adapted to the wedge block 201 on the main beam 2; the locking device 4 locks the upper end of the beam segment 3 on the side tower, and fixes the beam segment 3 on the inner side of the side tower; the vertical rotation device 5 hinges the lower end of the beam segment 3 on the inner side of the side tower, and hangs the upper end of the beam segment 3 on the side tower; when the side tower is vertically rotated to a specified position to form a stable arch tower, and the locking device 4 is released, the vertical rotation device 5 can adjust the height of the upper end of the beam segment 3, and vertically rotate the upper end of the beam segment 3 to the transverse wedge block 201 of the main beam 2;

[0044] Specifically, the locking device 4 and the vertical rotation device 5 can both independently realize the binding of the cross beam segment 3 and the side tower. During construction, the cross beam segment 3 and the side tower are first bound by the locking device 4, and then the vertical rotation device 5 is added to the cross beam segment 3 to realize synchronous binding, thereby increasing the stability of the cross beam segment 3. When the locking device 4 is gradually removed, the vertical rotation device 5 can independently bear the weight of the cross beam segment 3 and vertically rotate the cross beam segment 3 to a horizontal state, thereby realizing the connection between the cross beam segment 3 and the transverse wedge block 201; the specific function is that the locking device 4 can ensure that the shaking and impact during the process of vertically rotating and splicing the side tower into an arch tower will not cause the cross beam segment 3 to shift or fall off. When the side tower is vertically rotated to the specified position to form a stable arch tower, the arch tower is basically in a stationary state and the cross beam segment 3 is integrated with the arch tower; even if there is wind force, the vertical rotation device 5 can still ensure that the cross beam segment 3 and the arch tower shake synchronously, and there is no need to add a stabilizing device, and the vertical rotation and precise docking of the cross beam segment 3 can be easily completed.

[0045] In this embodiment, the locking device 4 includes a locking hinge 401, a steel hinge wire 402 and a rubber gasket; the locking hinge 401 is installed at the upper end of the beam segment 3, and a locking hole 101 corresponding to the locking hinge 401 is provided at a designated position of the side tower, so that the upper end of the beam segment 3 can be locked in the locking hole 101; the rubber gasket is arranged between the beam segment 3 and the side tower; the steel strand or steel rod can bind the beam segment 3 to the side tower; specifically, after the rubber gasket is padded in the gap between the beam segment 3 and the side tower, it can not only ensure that the steel strand or steel rod is firmly bound to the beam segment 3, but also avoid mechanical collision of the beam segment 3 with the side tower, especially reduce relative shaking and wear caused by mutual friction during shaking.

[0046] In this embodiment, the locking hinge 401 includes a locking handle 403, a locking column 404 and a locking head 405, and the locking handle 403 is fixed to the upper end of the beam segment 3; the entrance of the locking hole 101 is adapted to the shape and position of the locking head 405, and the bottom end of the locking hole 101 is provided with a locking groove 102 for hanging the locking head 405, and a vertical rotation motor is provided in the locking handle 403, which can drive the locking column 404 and the locking head 405 to rotate vertically as a whole, so that the locking head 405 is stuck in or out of the locking groove 102; specifically, before the locking head 405 is extended into the locking hole 101, the angle between the locking head 405 and the locking groove 102 is 90 to 180 degrees; after the locking head 405 is extended into the locking hole 101, under the action of the vertical rotation motor, the angle between the locking head 405 and the locking groove 102 is 0 degree, that is, the locking head 405 is hung in the locking groove 102.

[0047] In this embodiment, the vertical rotation device 5 includes a vertical rotation hinge 501, a vertical rotation cable 502 and a cable pulling machine 503; the vertical rotation hinge 501 is installed at the lower end of the beam segment 3, and a vertical rotation platform 103 corresponding to the vertical rotation hinge 501 is provided at a designated position of the side tower, and the vertical rotation hinge 501 can hinge the lower end of the beam segment 3 on the vertical rotation platform 103, and this designated position corresponds to the distance between the locking hole 101 and the length of the beam segment 3, that is, the beam segment 3 can just be hung between the locking hole 101 and the vertical rotation platform 103; the cable pulling machine 503 is installed on the side tower as a tensioning control device for the vertical rotation cable 502, and is used to gather or loosen the vertical rotation cable 502; one end of the vertical rotation cable 502 is connected to It is connected to the upper end of the beam segment 3, and the other end is connected to the cable machine 503; when the side tower is vertically rotated to the specified position and merged into the bridge tower 1, and the locking device 4 is released, the cable machine 503 can release the vertical rotation cable 502 to vertically rotate the upper end of the beam segment 3 to the transverse wedge block 201 of the main beam 2; when the locking device 4 is released, the cable machine 503 should be started first to tighten the vertical rotation cable 502 to lift the beam segment 3 upward a little, which is conducive to loosening the steel hinge wire 402 and vertically rotating the lock head 405, avoiding friction between the lock head 405 and the side wall of the lock groove 102, and then start the cable machine 503 to loosen the vertical rotation cable 502. When the beam segment 3 is vertically rotated downward by 5 to 15 degrees, the rubber gasket is taken out.

[0048] In this embodiment, a position sensor is provided on the vertical rotation platform 103, which is connected to the monitoring center through a signal line to monitor the vertical rotation state of the beam segment 3; a tension sensor is provided on the lock 405 and the vertical rotation cable 502, which is connected to the monitoring center through a signal line to monitor the stress state of the lock 405 and the vertical rotation cable 502 to ensure that the bridge tower 1 and the beam segment 3 are firmly connected; wherein the monitoring center is specifically a monitoring device set up at the control site, including a handheld remote control, a monitoring station or an operating base station, and the monitoring center adjusts the power of the cable machine 503 according to the real-time vertical rotation angle and angular velocity of the beam segment 3 to ensure that the beam segment 3 rotates vertically at a uniform speed and lands smoothly on the transverse wedge block 201 of the main beam 2.

[0049] In this embodiment, a patching section or a welded seam is set between the cross beam segment 3 and the wedge block 201 of the main beam 2 to achieve a rigid connection; the vertical turntable 103 can hang the lower end of the cross beam segment 3, and a patching section or a welded seam is set between the cross beam segment 3 and the vertical turntable 103 to achieve a rigid connection.

[0050] In this embodiment, the patching section includes a rigid connecting plate and bolts.

[0051] In this embodiment, the wedge block 201 is used as a connection device between the cross beam segment 3 and the main beam 2, and can also be replaced by a rectangular boss.

[0052] Embodiment 2:

[0053] After providing a beam vertical rotation system for an arch tower cable-stayed bridge as described in Example 1, an embodiment of the present invention further provides a method for using a smart seal and a construction method for a beam vertical rotation system for an arch tower cable-stayed bridge. The beam vertical rotation system used in this embodiment can directly utilize the one introduced in Example 1.

[0054] A construction method for a beam vertical rotation system for an arch tower cable-stayed bridge, the specific implementation steps are as follows:

[0055] In this embodiment, a construction method for the horizontal beam vertical rotation system includes the following steps.

[0056] Step 1: Set up the bridge piers and support system according to the design drawing requirements, and use the horizontal splicing method to make the side towers and beam segments 3 under the support of the bridge piers and supports, where the beam segments 3 are placed along the height direction of the side towers.

[0057] Step 2: Install the locking device 4: A locking hinge 401 is vertically rotatable on the upper end of the beam segment 3, and a locking hole 101 corresponding to the locking hinge 401 is arranged at a designated position of the side tower.

[0058] Step 3: Install the vertical rotation device 5: weld the vertical rotation hinge 501 at the lower end of the beam segment 3, set the vertical rotation platform 103 corresponding to the vertical rotation hinge 501 at the designated position of the side tower, and set the cable machine 503 at the designated position of the side tower.

[0059] Step 4: hinge the vertical hinge 501 at the lower end of the beam segment 3 to the vertical rotating platform 103, set a plurality of rubber gaskets between the beam segment 3 and the side tower, bind the beam segment 3 to the side tower through the steel strand, further tighten the steel strand upward to make the upper end of the beam segment 3 further rotate vertically upward until the locking hinge 401 is inserted into the locking hole 101, and the lock handle 403 is rotated vertically forward to hang the lock head 405 into the lock groove 102, and insert the rubber gasket into the remaining gap between the beam segment 3 and the side tower; in the initial state, the angle between the beam segment 3 and the side tower is 10 degrees.

[0060] Step 5: A position sensor is set on the vertical rotation platform 103, and the signal is directly connected to the monitoring center to monitor the vertical rotation status of the beam segment 3; tension sensors are respectively set on the lock head 405 and the vertical rotation cable 502, and the signal is directly connected to the monitoring center; the position sensor monitors the real-time angle between the beam segment 3 and the side tower, and the tension sensor can not only know the change of the tension of the vertical rotation cable 502 caused by the change of the center of gravity of the beam segment 3, but also grasp the health status of the lock head 405 and the vertical rotation cable 502, especially whether the lock head 405 is damaged in advance during construction.

[0061] Step 6: Vertical rotation of the beam: Wait until the left and right side spans, main beam 2 and beam segment 3 are constructed as required, rotate the two side towers vertically and then horizontally to form a complete arch span tower 1. After the tower 1 and main beam 2 are connected to form a cable-stayed bridge through inclined cables, start the winch at low power, slightly retract the vertical rotation cable 502 to lift the beam segment 3 to facilitate the release of the locking hinge 401, reversely rotate the lock handle 403 vertically to disengage the lock head 405 from the lock groove 102, and then release the steel hinge line 402.

[0062] Step seven: Control the winch to slowly release the vertical rotation cable 502. Under the action of gravity of the beam segment 3, the upper end of the beam segment 3 rotates vertically downward with the vertical rotation hinge 501 as the center, and the rubber gasket is gradually removed until the lower end surface of the beam segment 3 is squeezed onto the vertical rotation platform 103. The vertical rotation platform 103 hangs the lower end of the beam segment 3. At this time, the upper end of the beam segment 3 has been placed on the horizontal wedge block 201 of the main beam 2. The monitoring center reduces the power of the winch to shut down according to the position sensor signal; during the construction process, the monitoring center monitors the stress state of the lock 405 and the vertical rotation cable 502 according to the tension sensor to ensure that the bridge tower 1 and the beam segment 3 are firmly connected; specifically, the vertical rotation range of the beam segment 3 is from 10 degrees to 90 degrees between the beam segment 3 and the side tower, where 90 degrees corresponds to the beam segment 3 being horizontally placed on the wedge block 201 of the main beam 2.

[0063] Step 8: After the cross beam segment 3 and the main beam 2 are successfully spliced, a patching section or a welded seam is set between the cross beam segment 3 and the main beam 2 to achieve a rigid connection; a patching section or a welded seam is set between the cross beam segment 3 and the vertical rotation platform 103 to achieve a rigid connection. After the cable-stayed bridge forms a stable structure, the locking device 4 and the vertical rotation device 5 are removed, and the next step is carried out according to the specific project.

[0064] In this embodiment, steel rods of appropriate size may be used instead of steel strands.

[0065] Furthermore, in the embodiment, the size and structural strength of the corresponding components of the locking device 4 and the vertical rotation device 5 are related to the size and weight of the beam segment 3. During the design, it is ensured that the locking device 4 and the vertical rotation device 5 have sufficient strength to support the fixation and vertical rotation of the beam segment 3, retaining a 100% safety margin, thereby avoiding the risk of damage caused by sudden stress changes due to shaking or impact during the vertical rotation operation in the embodiment.

[0066] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0067] The above description is only 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 in the protection scope of the present invention.

Claims

1. A beam vertical rotation system for an arch-tower cable-stayed bridge, the arch-tower cable-stayed bridge comprising a bridge tower (1), a main beam (2) and a cross beam segment (3), the bridge tower (1) being an arch-shaped bridge tower, formed by splicing two symmetrical side towers on the left and right, and the bridge tower (1) suspends the main beam (2) through a cable-stayed cable; It is characterized in that Wedge blocks (201) are arranged on both sides of the main beam (2); a cross beam segment (3) is arranged on each side tower. The beam vertical rotation system comprises a locking device (4) and a vertical rotation device (5) for adjusting the height of the upper end of the beam segment (3) so that the upper end of the beam segment (3) can be vertically rotated to the wedge block (201) of the main beam (2). The cross beam segment (3) is a rectangular parallelepiped structure, and the upper end shape is adapted to the wedge-shaped block (201) on the main beam (2); The locking device (4) locks the upper end of the beam segment (3) to the inner side of the side tower. The vertical rotation device (5) hinges the lower end of the beam segment (3) to the inner side of the side tower.

2. The beam vertical rotation system according to claim 1, characterized in that: The locking device (4) comprises a locking hinge (401), a steel hinge wire (402) or a steel rod, and a rubber gasket; The locking hinge (401) is installed at the upper end of the crossbeam segment (3), and the side tower is provided with a locking hole (101) corresponding to the locking hinge (401); The rubber gasket is arranged between the cross beam segment (3) and the side tower; The steel hinge wires (402) or steel rods can bind the beam segments (3) to the side towers.

3. The beam vertical rotation system according to claim 2, characterized in that: The locking hinge (401) comprises a locking handle (403), a locking column (404) and a locking head (405); the locking handle (403) is fixed to the upper end of the beam segment (3); the entrance of the locking hole (101) is adapted to the shape and position of the locking head (405); the bottom end of the locking hole (101) is provided with a locking groove (102) for hanging the locking head (405); the locking handle (403) is provided with a motor that can drive the locking column (404) and the locking head (405) to rotate as a whole so that the locking head (405) is inserted into or withdraws from the locking groove (102) to rotate vertically.

4. The beam vertical rotation system according to claim 3, characterized in that: The vertical rotation device (5) comprises a vertical rotation hinge (501), a vertical rotation cable (502) and a cable pulling machine (503); The vertical rotation hinge (501) is installed at the lower end of the cross beam segment (3), and the side tower is provided with a vertical rotation platform (103) corresponding to the vertical rotation hinge (501), and the vertical rotation hinge (501) hinges the lower end of the cross beam segment (3) on the vertical rotation platform (103); The cable pulling machine (503) is installed on the side tower and is used to gather or release the vertical rotation cable (502); One end of the vertical rotation cable (502) is connected to the upper end of the cross beam segment (3), and the other end is connected to the cable pulling machine (503); The cable pulling machine (503) vertically rotates the upper end of the cross beam segment (3) to the wedge block (201) of the main beam (2) via the vertical rotation cable (502).

5. The beam vertical rotation system according to claim 4, characterized in that: The vertical rotating platform (103) is provided with a position sensor, which is connected to the monitoring center via a signal line to monitor the vertical rotating state of the cross beam segment (3); The lock head (405) and the vertical rotation rope (502) are provided with tension sensors, which are connected to a monitoring center via a signal line to monitor the stress state of the lock head (405) and the vertical rotation rope (502).

6. The beam vertical rotation system according to claim 5, characterized in that: A patching section or a welded seam is provided between the cross beam segment (3) and the wedge-shaped block (201) of the main beam (2) to realize a rigid connection; the vertical rotating platform (103) hangs the lower end of the cross beam segment (3), and a patching section or a welded seam is provided between the cross beam segment (3) and the vertical rotating platform (103) to realize a rigid connection.

7. The beam vertical rotation system according to claim 6, characterized in that: The patching section includes a rigid connecting plate and bolts.

8. A construction method for the beam vertical rotation system according to claim 7, characterized in that: The following steps are involved: Step 1: arranging the bridge pier and support system according to the design drawing requirements, and manufacturing the side tower and the cross beam segment (3) by horizontal splicing method under the support of the bridge pier and the support, wherein the cross beam segment (3) is placed along the height direction of the side tower; Step 2: Install the locking device (4): A locking hinge (401) is vertically rotatable on the upper end of the beam segment (3), and a locking hole (101) corresponding to the locking hinge (401) is provided at a designated position of the side tower; Step 3: Install the vertical rotation device (5): weld a vertical rotation hinge (501) at the lower end of the beam segment (3), set a vertical rotation platform (103) corresponding to the vertical rotation hinge (501) at a designated position of the side tower, and set a cable puller (503) at a designated position of the side tower; Step 4: hinge the lower end of the beam segment (3) with the vertical hinge (501) to the vertical rotating platform (103), set a plurality of rubber gaskets between the beam segment (3) and the side tower, bind the beam segment (3) to the side tower through the steel hinge wire (402) or the steel rod, further tighten the steel hinge wire (402) or the steel rod wire upward to make the upper end of the beam segment (3) further rotate vertically upward until the locking hinge (401) is inserted into the locking hole (101), and the lock handle (403) is rotated vertically in the forward direction to hang the lock head (405) into the lock groove (102), and insert the rubber gasket into the remaining gap between the beam segment (3) and the side tower; Step 5: A position sensor is arranged on the vertical rotating platform (103), and the signal is directly connected to the monitoring center to monitor the vertical rotating state of the cross beam segment (3); tension sensors are arranged on the lock head (405) and the vertical rotating cable (502), and the signal is directly connected to the monitoring center; Step 6: Vertical rotation of the cross beam: Wait until the left and right side spans, the main beam (2) and the cross beam segment (3) are completed as required, and the two side towers are first vertically rotated and then horizontally rotated to form a complete arch span bridge tower (1). After the bridge tower (1) and the main beam (2) are connected to form a cable-stayed bridge through a cable-stayed cable, the winch is started to operate at low power, and the vertical rotation cable (502) is slightly retracted to lift the cross beam segment (3) to facilitate the release of the locking hinge (401). The lock handle (403) is vertically rotated in the reverse direction to make the lock head (405) disengage from the lock groove (102), and then the steel hinge wire (402) or steel rod is released; Step 7: Control the winch to slowly release the vertical rotation cable (502). Under the gravity of the beam segment (3), the upper end of the beam segment (3) rotates vertically downward with the vertical rotation hinge (501) as the center, and the rubber gasket is gradually removed until the lower end surface of the beam segment (3) is squeezed onto the vertical rotation platform (103). The vertical rotation platform (103) hangs the lower end of the beam segment (3). At this time, the upper end of the beam segment (3) has been placed on the wedge block (201) of the main beam (2). The monitoring center reduces the power of the winch to shut down according to the position sensor signal; during the construction process, the monitoring center monitors the stress state of the lock head (405) and the vertical rotation cable (502) according to the tension sensor to ensure that the bridge tower (1) and the beam segment (3) are firmly connected; Step 8: After the cross beam segment (3) and the main beam (2) are successfully spliced, a patching section or a welded seam is provided between the cross beam segment (3) and the main beam (2) to achieve a rigid connection; a patching section or a welded seam is provided between the cross beam segment (3) and the vertical rotating platform (103) to achieve a rigid connection. After the cable-stayed bridge forms a stable structure, the locking device (4) and the vertical rotating device (5) are removed, and the next step is carried out according to the specific project.

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