Device and method for automatically adjusting deviation of central pier buckling tower of continuous-span arch bridge

Abstract

The invention provides an automatic adjusting device for deviation of a buckling tower of a central pier of a continuous-span arch bridge, which is used for adjusting the deviation of the buckling tower of the arch bridge under construction, the buckling tower is arranged at the top of the middle pier of the arch bridge, and the automatic adjusting device comprises a ground anchoring device, two sets of jack systems, a tower end anchoring device, two adjusting cables, a displacement monitoring station and a control system; the ground anchoring device is arranged on an arch bridge side pier along the bridge direction; the two sets of jack systems are connected with the ground anchoring device; the tower end anchoring device is arranged between columns of the buckling tower; the two adjusting cables are connected between the two ends of the tower end anchoring device and the two jack systems. The displacement monitoring station is arranged at the top end of the buckling tower; the signal input end of the control system is in wireless signal connection with the displacement monitoring station, and the signal output end of the control system is electrically connected with the jack system. According to the automatic adjusting device for deviation of the buckling tower of the central pier of the continuous-span arch bridge, single-side arch rib segment installation and buckle cable tensioning can be achieved, the arch rib installation line type can be guaranteed, the risk of segment large cantilever installation is reduced, and the construction cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of arch bridge construction, and in particular relates to an automatic adjustment device for the deviation of a central pier and tower of a continuous-span arch bridge. Background Art

[0002] The characteristic of a double-span continuous arch bridge is the continuous arch effect of the central arch seat. After the bridge is completed, the central arch seat is balanced due to the opposite and equal horizontal thrusts on both sides, and the central arch seat is only subjected to vertical pressure. However, during the arch rib hoisting process, since the cable crane can only hoist one arch rib segment at a time, a large unbalanced force will be generated on the pier body and buckle tower of the central arch seat after the arch rib segment on one side is hoisted, causing the tower to deviate. The traditional construction method for hoisting the arch ribs on both sides of the middle pier generally adopts the large cantilever "single tower double buckle" construction measure. After the arch rib on one side is hoisted and installed in place, it is temporarily connected to the previous segment through the internal flange bolts between the segments. Then the cable crane unhooks and installs the arch rib segment on the other side. After the arch rib segments on both sides are installed, the buckle cable is tensioned at the same time. The characteristic of this construction method is that the weight of the arch rib section transfers the load to the cables of the previous section through the inter-section flange. The cables of the previous section have to bear the gravity components of the two arch rib sections at the same time, which increases the amount of cables used. The increase in the cable force will lead to an increase in the amount of tower materials invested, and the deviation of the pier body and tower is larger than that of active control measures, and the arch rib installation process is more risky. Summary of the invention

[0003] In view of this, an object of the present invention is to provide an automatic adjustment device and method for the deviation of the central pier and tower of a multi-span arch bridge, so as to overcome the above-mentioned problems or at least partially solve or alleviate the above-mentioned problems.

[0004] The present invention provides an automatic adjustment device for the deviation of a buckle tower of a central pier of a continuous-span arch bridge, which is used to adjust the deflection of a buckle tower of an arch bridge under construction. The buckle tower is arranged on the top of the middle pier of the arch bridge, and comprises:

[0005] A ground anchoring device, wherein the ground anchoring device is installed on a side pier of the arch bridge;

[0006] Two sets of jack systems, both sets of the jack systems are connected to the ground anchoring device;

[0007] A tower end anchoring device, the tower end anchoring device is arranged between the columns of the tower;

[0008] Two adjustment cables, two sets of the adjustment cables are connected between two ends of the tower end anchoring device and the two sets of the jack systems;

[0009] A displacement monitoring station, which is arranged at the top of the buckle tower;

[0010] A control system, wherein a signal input end of the control system is connected to the displacement monitoring station by wireless signals, and a signal output end of the control system is electrically connected to the jack system.

[0011] The present invention also has the following optional features.

[0012] Optionally, the ground anchoring device includes a steel anchor beam and an anchor seat, the steel anchor beam is arranged close to the rear edge of the arch bridge side pier, and the two anchor seats are arranged at both ends of the steel anchor beam.

[0013] Optionally, a limiting device is further included, and two limiting devices are arranged on the inner sides of the two anchor seats on the steel anchor beam.

[0014] Optionally, each set of the jack system includes a set of intelligent jacks and a frame, the intelligent jack is installed in the frame, and the frame is connected to the anchor seat of the ground anchoring device by a pin shaft.

[0015] Optionally, the tower end anchoring device includes an anchor beam, two corbels, two anchor seats and two anchor boxes, the two corbels are respectively welded to the two end sides of the anchor beam, an anchor seat is respectively welded to the end of the cross beam of each corbel, and an anchor box is respectively arranged on each anchor seat, and each anchor box is respectively connected to one of the adjusting ropes.

[0016] The present invention further proposes a method for automatically adjusting the deviation of the central pier and tower of a multi-span arch bridge, which is implemented by using any of the above-mentioned automatic adjustment devices for adjusting the deviation of the central pier and tower of a multi-span arch bridge, and comprises the following steps:

[0017] S001. Use a cable crane to hoist the arch rib segment No. N on the long mileage side of the middle pier into place, temporarily connect it with the joint of the previous arch rib segment, and then install the buckle cable of the arch rib segment No. N on the long mileage side of the middle pier;

[0018] S002. Tension the cable step by step to the designed cable force according to the monitoring instructions. If the pylon deviates to the long mileage side of the middle pier of the arch bridge, the control system controls the jack system to gradually tighten the adjustment cable;

[0019] S003. If the tower is displaced toward the small mileage side of the middle pier, the control system controls the jack system to gradually loosen the adjusting cable.

[0020] Beneficial effects of the present invention:

[0021] The main function of the automatic adjustment device and adjustment method for the deviation of the central pier tower of the continuous-span arch bridge of the present invention is to monitor the deviation of the tower during the arch rib hoisting process, and then send the deviation information to the receiving station, and the control box controls the action of the intelligent jack to automatically tension or relax the adjustment cable, so that the deviation of the tower is always controlled within 50mm. Compared with the traditional construction method, the design advantages of the invention are: once the equipment is put into use, the deviation of the middle pier tower can be automatically controlled, and the tower deviation can be controlled to the millimeter level, without the need to invest manpower and material resources, and the process safety is relatively high; using the intelligent adjustment cable, the middle pier can realize the installation of the arch rib segment on one side and tension the cable, which can not only ensure the arch rib installation line, but also reduce the risk of large cantilever installation of the segment; the use of the intelligent adjustment cable can reduce the investment in cable and tower materials, and reduce the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the automatic adjustment device for the deviation of the central pier buckle tower of a multi-span arch bridge of the present invention;

[0023] Figure 2 yes Figure 1 A top view of

[0024] Figure 3 yes Figure 1 Structural diagram of ground anchoring device in;

[0025] Figure 4 yes Figure 1 The structural diagram of the buckle tower in the figure;

[0026] Figure 5 yes Figure 4 The structural diagram of the tower end anchoring device;

[0027] In the above figure: 1 ground anchoring device; 101 steel anchor beam; 102 anchor seat; 103 limit device; 2 jack system; 201 intelligent jack; 202 frame; 3 buckle tower; 4 tower end anchoring device; 401 buckle anchor beam; 402 corbel; 403 anchor seat; 404 anchor box; 5 adjustment cable; 6 displacement monitoring station; 7 control system; 8 side pier; 9 middle pier.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0029] Example 1

[0030] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5An embodiment of the present invention proposes an automatic adjustment device for the deviation of a buckle tower of a central pier of a continuous-span arch bridge, which is used to adjust the deflection of a buckle tower 3 of an arch bridge under construction. The buckle tower 3 is arranged on the top of a middle pier 9 of the arch bridge, and comprises: a ground anchoring device 1, two sets of jack systems 2, a tower end anchoring device 4, two adjustment cables 5, a displacement monitoring station 6 and a control system 7; the ground anchoring device 1 is installed on a side pier 8 of the arch bridge; the two sets of jack systems 2 are connected to the ground anchoring device 1; the tower end anchoring device 4 is arranged between the columns of the buckle tower 3; the two adjustment cables 5 are connected between the two ends of the tower end anchoring device 4 and the two sets of jack systems 2; the displacement monitoring station 6 is arranged at the top of the buckle tower 3; the signal input end of the control system 7 is wirelessly connected to the displacement monitoring station 6, and the signal output end of the control system 7 is electrically connected to the jack system 2.

[0031] The buckle tower 3 is installed on the top of the middle pier 9 of the arch bridge and is welded and fixed to the embedded parts arranged in the middle pier cap beam. The buckle tower 3 is composed of steel pipe columns and inter-column connections. Each group of steel pipe columns is composed of two Φ500×10 steel pipes standing side by side. The inter-column connections adopt double-piece HN400×200 steel. The inter-column connections not only constitute the load-bearing structure of the buckle tower 3, but also serve as the support system of the tower end anchor device 4.

[0032] One end of the two adjusting cables 5 is connected to the jack system 2, and the other end is connected to the tower end anchor device 4. Each adjusting cable 5 is composed of 18 Φ17.8mm high-strength, low-relaxation steel strands with a tensile strength of 1860Mpa.

[0033] The displacement monitoring station 6 is installed at the top of the buckle tower 3. Its function is to monitor in real time the displacement of the buckle tower 3 caused by the unbalanced force during the arch rib hoisting process, and then send the tower displacement information to the control system 7.

[0034] The control system 7 is arranged at the center line position near the rear edge of the ground anchor device 1. The control system 7 is composed of a receiving station, a PLC control box and a sensor. Its function is to receive the tower deviation information from the displacement monitoring station 6, and then start the control box to control the action of the jack system, and monitor the activity of the jack system in real time through the sensor, so as to realize the real-time adjustment of the deviation of the buckle tower 3.

[0035] During use, the cable crane hoists the arch rib segment No. N on the mileage side of the middle pier 9 into place, and the temporary connection with the joint of the previous arch rib segment is completed, and then the buckle cable of the arch rib segment No. N on the mileage side of the middle pier 9 is installed. The buckle cable is tensioned step by step to the designed cable force according to the monitoring instruction. During the buckle cable loading process, if the buckle tower 3 deviates to the mileage side of the middle pier 9 of the arch bridge, the displacement monitoring station 6 sends the tower deviation information to the control system 7. The control system 7 automatically outputs a control signal to the solenoid valve according to the tower deviation data, and controls the jack system 2 to gradually tighten the adjustment cable 5, so that the deviation of the buckle tower 3 in the whole process is always controlled within the design range.

[0036] During the cable loading process, if the tower 3 deviates toward the small mileage side of the middle pier 9, the displacement monitoring station 6 sends the tower deviation information to the control system 7. The control system 7 automatically outputs a control signal to the solenoid valve according to the tower deviation data, controls the jack system 2 to gradually loosen the adjustment cable 5, and controls the deviation of the tower 3 in the whole process within the design range.

[0037] Example 2

[0038] refer to Figure 3 On the basis of Example 1, the ground anchoring device 1 includes a steel anchor beam 101 and two anchor seats 102. The steel anchor beam 101 is arranged close to the rear edge of the side pier 8 of the arch bridge, and the two anchor seats 102 are arranged at both ends of the steel anchor beam 101.

[0039] The steel anchor beam 101 is connected to the rear edge of the side pier 8 of the arch bridge through a connecting piece, and anchor seats 102 are symmetrically installed at the cantilevered parts of the steel anchor beam 101 for tensioning the adjustment cable 5.

[0040] Example 3

[0041] refer to Figure 3 On the basis of Example 2, it further includes a limiting device 103 , and two limiting devices 103 are arranged on the inner sides of two anchor seats 102 on the steel anchor beam 101 .

[0042] The limiting device 103 is made of an I-beam of model Ⅰ25a, which is connected to the steel anchor beam 101 by screws. The top of the steel anchor beam 101 is in close contact with the bottom of the limiting device 103. The horizontal tensioning force of the adjusting cable 5 is transmitted from the steel anchor beam 101 to the rear edge of the side pier to offset it. The displacement of the anchor seat 102 caused by the vertical force is limited by the limiting device 103.

[0043] Example 4

[0044] refer to Figure 3 On the basis of Example 2, each jack system 2 includes a set of intelligent jacks 201 and a frame 202. The intelligent jacks 201 are installed in the frame 202, and the frame 202 is connected to the anchor seat 102 of the ground anchoring device 1 by a pin shaft.

[0045] The smart jack 201 is provided with a piston and a cylinder. The smart jack 201 is a jack with a position sensor, which can detect the extension and retraction displacement. The detection sleeve 202 is a box structure formed by welding steel plates and steel pipes. The adjustment cable 5 is connected to the box structure. By controlling the movement of the piston in the cylinder, the smart jack 201 can be started to tighten or loosen the adjustment cable 5.

[0046] Example 5

[0047] refer to Figure 4 and Figure 5On the basis of Example 1, the tower end anchoring device 4 includes an anchor beam 401, two corbels 402, two anchor seats 403 and two anchor boxes 404. The two corbels 402 are respectively welded to the two end sides of the anchor beam 401, and an anchor seat 403 is respectively welded to the end of the cross beam of each corbel 402. An anchor box 404 is respectively arranged on each anchor seat 403, and each anchor box 404 is respectively connected to an adjusting rope 5.

[0048] The tower end anchoring device 4 is welded and fixed to the column connection of the buckle tower 3. The buckle anchor beam 401 is designed as a steel box structure. The corbel 402 is welded to the side of the buckle anchor beam 401. The corbel 402 is composed of a crossbeam and a diagonal rod. The two ends of the crossbeam of the corbel 402 are respectively welded with anchor seats 403. The anchor seats 403 and the anchor box 404 are pin-connected. A plurality of circular holes with a diameter of 21 mm are opened on the anchor plate of the anchor box 404. The steel strands in the adjusting cable 5 pass through the circular holes and enter the anchor box 404 and are fixed with an extrusion sleeve.

[0049] Example 6

[0050] An embodiment of the present invention further proposes an automatic adjustment method for the deviation of the buckle tower of the central pier of a continuous-span arch bridge, which is implemented by using the automatic adjustment device for the deviation of the buckle tower of the central pier of a continuous-span arch bridge described in any of the above embodiments, and includes the following steps: S001, using a cable crane to hoist the Nth arch rib segment on the large mileage side of the middle pier 9 into place, temporarily connecting it with the joint of the previous arch rib segment, and then installing the buckle cable of the Nth arch rib segment on the large mileage side of the middle pier 9; S002, tensioning the buckle cable step by step to the designed cable force according to the monitoring instruction requirements, if the buckle tower 3 deviates to the large mileage side of the middle pier 9 of the arch bridge, the control system 7 controls the jack system 2 to gradually tighten the adjustment cable 5; S003, if the buckle tower 3 deviates to the small mileage side of the middle pier 9, the control system 7 controls the jack system 2 to gradually loosen the adjustment cable.

[0051] In S001, the No. N arch rib segment on the long mileage side of the middle pier 9 is hoisted into place by a cable crane, and the temporary connection with the joint of the previous arch rib segment is completed, and then the No. N arch rib segment on the long mileage side of the middle pier 9 is installed; S002, the cable is tensioned step by step to the designed cable force according to the monitoring instruction requirements. During the cable loading process, if the buckle tower 3 deviates to the long mileage side of the middle pier 9 of the arch bridge, the displacement monitoring station 6 sends the tower deviation information to the control system 7, and the control system 7 automatically outputs a control signal to the solenoid valve according to the tower deviation data, and controls the jack system 2 to gradually tighten the adjustment cable 5, so that the deviation of the buckle tower 3 in the whole process is always controlled within the design range; S003, during the cable loading process, if the buckle tower 3 deviates to the short mileage side of the middle pier 9, the displacement monitoring station 6 sends the tower deviation information to the control system 7, and the control system 7 automatically outputs a control signal to the solenoid valve according to the tower deviation data, and controls the jack system 2 to gradually loosen the adjustment cable, so that the deviation of the buckle tower 3 in the whole process is always controlled within the design range.

[0052] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims

1. An automatic adjustment device for the deviation of a pylon of a central pier of a continuous-span arch bridge, used for adjusting the deflection of a pylon (3) of an arch bridge under construction, wherein the pylon (3) is arranged on the top of a middle pier (9) of the arch bridge, and characterized in that: include: A ground anchoring device (1), wherein the ground anchoring device (1) is installed on a side pier (8) of an arch bridge; Two sets of jack systems (2), the two sets of jack systems (2) are connected to the ground anchoring device (1); A tower end anchoring device (4), wherein the tower end anchoring device (4) is arranged between columns of the buckle tower (3); Two adjusting cables (5), the two adjusting cables (5) being connected between two ends of the tower end anchoring device (4) and the two sets of the jack systems (2); A displacement monitoring station (6), wherein the displacement monitoring station (6) is arranged at the top of the buckle tower (3); A control system (7), wherein a signal input end of the control system (7) is wirelessly connected to the displacement monitoring station (6), and a signal output end of the control system (7) is electrically connected to the jack system (2).

2. The automatic adjustment device for the deviation of the central pier and tower of a multi-span arch bridge according to claim 1 is characterized in that: The ground anchoring device (1) comprises a steel anchor beam (101) and two anchor seats (102); the steel anchor beam (101) is arranged close to the rear edge of the side pier (8), and the two anchor seats (102) are arranged at both ends of the steel anchor beam (101).

3. The automatic adjustment device for the deviation of the central pier and tower of a multi-span arch bridge according to claim 2 is characterized in that: It also comprises a limiting device (103), wherein two limiting devices (103) are arranged on the inner sides of the two anchor seats (102) on the steel anchor beam (101).

4. The automatic adjustment device for the deviation of the central pier and tower of a multi-span arch bridge according to claim 1 is characterized in that: Each set of the jack system (2) comprises a set of intelligent jacks (201) and a frame (202), wherein the intelligent jacks (201) are installed in the frame (202), and the frame (202) is connected to the anchor seat (102) of the ground anchoring device (1) by a pin shaft.

5. The automatic adjustment device for the deviation of the central pier and tower of a multi-span arch bridge according to claim 1 is characterized in that: The tower end anchoring device (4) comprises an anchor beam (401), two brackets (402), two anchor seats (403) and two anchor boxes (404), the two brackets (402) are respectively welded to the two end sides of the anchor beam (401), one anchor seat (403) is respectively welded to the end of the cross beam of each bracket (402), each anchor seat (403) is respectively provided with an anchor box (404), and each anchor box (404) is respectively connected to one of the adjusting ropes (5).

6. A method for automatically adjusting the deviation of the central pier and tower of a continuous-span arch bridge, implemented by using the automatic adjustment device for the deviation of the central pier and tower of a continuous-span arch bridge according to any one of claims 1 to 5, characterized in that: The following steps are involved: S001. Use a cable crane to hoist the arch rib segment No. N on the long mileage side of the middle pier (9) into place, complete the temporary connection with the joint of the previous arch rib segment, and then install the arch rib segment No. N on the long mileage side of the middle pier (9); S002, tensioning the cable step by step to the designed cable force according to the monitoring instruction. If the pylon (3) deviates toward the large mileage side of the middle pier (9) of the arch bridge, the control system (7) controls the jack system (2) to gradually tighten the adjustment cable (5); S003. If the buckle tower (3) deviates toward the small mileage side of the middle pier (9), the control system (7) controls the jack system (2) to gradually loosen the regulating rope.

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