A hoisting construction method for a main girder of a long-span deck arch bridge

Abstract

The present application relates to a kind of large-span deck arch bridge girder hoisting construction method, main girder hoisting system is arranged on the arch ring, the main girder hoisting system includes two main girder lifting frame and two main girder temporary resting support;Beam barge transports main girder section to bridge, first by two winches of main girder lifting system Main girder section is hoisted to two main girder temporary resting support, then by cable crane hoists main girder section from main girder temporary resting support to installation position.The cable crane only needs to hoist beam longitudinal displacement, without repeatedly transverse, avoid the risk of jumping cable and broken cable, can guarantee construction safety.

Description

A method for hoisting and constructing the main beam of a long-span, upper-bearing arch bridge Technical Field

[0001] This invention belongs to the field of bridge construction technology, and relates to the construction of an upper-bearing arch bridge, specifically to a method for hoisting the main beam of a large-span upper-bearing arch bridge. Background Technology

[0002] As shown in Figure 1, a typical upper-bearing arch bridge includes a main arch ring 1, with piers 2 at the top of the arch ring. A beam structure is erected on the piers, comprising two main beams 3 arranged longitudinally along the bridge direction. Multiple transverse beams connect the two main beams, and a bridge deck system is laid on the main beams and transverse beams. Each main beam 3 is generally divided into multiple segments according to the bridge span. During the installation of the main beams, a beam transport vessel 4 is typically used to transport the main beam segments to the bridge, and a cable crane 5 is used to hoist the main beam segments segment by segment.

[0003] As shown in Figure 2, during the main beam hoisting construction, since the main arch ring has been completed, the cable crane can only lift the main beam from the outside of the main arch ring bridge. Therefore, the longitudinal axis of the main beam hoisting position deviates significantly from the installation position. Usually, a cable saddle 7 that can be moved laterally is installed at the top of the cable tower 6. The cable saddle 7 is first moved laterally to the edge of the tower top. The cable crane first lifts the main beam 3 vertically to the design elevation. Then, the cable saddle 7 is pulled laterally by jacks or winches to move the main beam laterally to the design axis position. The cable crane then carries the main beam longitudinally to the installation position and lowers the beam. This process is repeated until the main beam installation on the arch is completed.

[0004] The above construction method has the following problems: repeated large-scale lateral movement of the cable crane causes repeated friction between the cable and the main saddle, which can easily lead to cable jumping and breakage. At the same time, when the saddle is laterally moved under load, it exerts a large horizontal reaction force on the tower, which can easily cause the tower to become unstable and poses a significant safety risk. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a method for hoisting the main beam of a long-span, upper-bearing arch bridge, so as to ensure the safety of the main beam hoisting construction.

[0006] The technical solution of the present invention is as follows:

[0007] A method for hoisting the main beam of a long-span, upper-bearing arch bridge, wherein the upper-bearing arch bridge includes an arch ring, and the top of the arch ring is provided with multiple piers for erecting the main beam, characterized by the following steps:

[0008] (1) A main beam lifting system is installed on the arch ring, the main beam lifting system including two main beam lifting frames and two main beam temporary support brackets;

[0009] Each of the main beam lifting frames includes a rectangular cross-section foundation support. The bottom of the foundation support is fixed to the top of the arch ring. A rectangular cross-section load-bearing truss is fixedly installed transversely at the top of the foundation support. The two ends of the load-bearing truss extend to the outer and inner sides of the bridge respectively to form cantilever arms. A sliding support is installed at the top of the load-bearing truss, and a winch is fixedly installed on the sliding support. A reaction seat is installed at the top of the cantilever arms at both ends of the load-bearing truss. A traction jack is installed on the outer side of each reaction seat. The traction jack is connected to the sliding support through a tie rod. The heights of the two main beam lifting frames are equal and greater than the height of the piers. The distance between the two lifting frames is greater than the distance between two adjacent piers.

[0010] The temporary support for the main beam is a rectangular cross-section support, with the lower end of the support fixed to the top of the arch ring; the two temporary support supports for the main beam are located between the two main beam lifting frames, the distance between the two temporary support supports for the main beam is less than the distance between the two adjacent piers, the height of the two support supports for the main beam is equal, and is higher than the height of the piers but lower than the height of the main beam lifting frames.

[0011] (2) The beam transport vessel transports the main beam to the bridge. The two winches of the main beam lifting system lower the hoisting ropes to connect the two ends of the first main beam segment, lift the main beam segment to a height above the temporary support of the main beam, and pull the sliding support to the inside of the bridge to the top of the temporary support of the main beam through the traction jack on the cantilever of one end of the load-bearing truss. Then the winches lower the main beam segment to the two temporary support supports.

[0012] (3) The cable crane lifts the main beam segment from the temporary support of the main beam and moves it longitudinally along the bridge to the installation position, and then lowers the main beam segment onto the two piers;

[0013] (4) The traction jack on the other end of the main beam lifting frame pulls the sliding support and winch back to the outside of the bridge, lifts the second main beam segment to the temporary support of the main beam, and the cable crane returns to lift the second main beam segment to the installation position, connecting the first and second segments of the main beam.

[0014] (5) Repeat step (4) to carry out the subsequent main beam segment hoisting, among which the main beam segments at the location of the main beam lifting system are hoisted last; when hoisting the last few main beam segments, the cable crane first temporarily hoists these main beam segments onto the main beam that has been installed, then removes the main beam lifting frame and the main beam temporary support bracket, and the cable crane then hoists the main beam segments into place in sequence.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) High safety. The main beam is lifted and moved laterally to the bottom of the cable crane using a main beam lifting system. The cable crane only needs to lift the beam longitudinally, without repeated lateral movement, thus avoiding the risk of cable jumping and cable breakage.

[0017] (2) Good economic benefits. Conventional cable crane construction methods require widening the top of the cable tower to achieve lateral movement of the cable crane; with the method of this invention, the top of the cable tower no longer needs to be widened, and the material consumption of the main beam lifting system is less. Compared with widening the top of the cable tower, the construction cost is lower, and the higher the cable tower, the more significant the cost reduction effect. Attached Figure Description

[0018] Figure 1 is a side view of the existing main beam hoisting construction method;

[0019] Figure 2 is an elevation view of the existing main beam hoisting construction method;

[0020] Figure 3 is a side view of the main beam hoisting system of the present invention;

[0021] Figure 4 is a partial enlarged view of Figure 3, mainly showing the side view structure of the main beam lifting system;

[0022] Figure 5 is a longitudinal side view of a main beam lifting frame;

[0023] Figure 6 is a transverse elevation view of a main beam lifting frame;

[0024] Figure 7 is a longitudinal side view of a temporary support bracket for the main beam;

[0025] Figure 8 is a transverse elevation view of a temporary support for the main beam.

[0026] Figure 9 is a schematic diagram of the main beam lifting system lifting a main beam segment onto the temporary support of the main beam.

[0027] Figure 10 is a schematic diagram of the state of the first main beam segment being hoisted by cable crane;

[0028] Figure 11 is a schematic diagram of the state of the second main beam segment being hoisted by cable crane;

[0029] Figure 12 is a schematic diagram showing the completed hoisting of all main beam segments. Detailed Implementation

[0030] As shown in Figure 3, the upper-bearing arch bridge includes an arch ring 1, which is a rigid frame encased in concrete. Multiple piers 2 are located at the top of the arch ring for supporting the main beam. The main beam is hoisted using a cable crane 5, and the specific hoisting method is as follows:

[0031] (1) As shown in Figures 3 and 4, a main beam lifting system is first set on the arch ring 1. The main beam lifting system includes two main beam lifting frames 8 and two main beam temporary support brackets 9.

[0032] As shown in Figures 5 and 6, each of the main beam lifting frames 8 includes a rectangular cross-section base support 81. The bottom of the base support 81 is fixed to the top of the arch ring 1. A rectangular cross-section load-bearing truss 82 is fixedly installed in the transverse direction at the top of the base support. The two ends of the load-bearing truss 82 extend to the outer and inner sides of the bridge respectively to form cantilever arms. A sliding support 83 is installed at the top of the load-bearing truss 82. A winch 84 is fixedly installed on the sliding support 83. A reaction seat 85 is installed at the top of the cantilever arms at both ends of the load-bearing truss 81. A traction jack 86 is installed on the outside of each reaction seat 85. The traction jack 86 is connected to the sliding support 83 through a tie rod 87.

[0033] As shown in Figures 3 and 4, the heights of the two main beam lifting frames 8 are equal and greater than the height of the pier column 2, and the distance between the two lifting frames 8 is greater than the distance between two adjacent pier columns 2.

[0034] As shown in Figures 7 and 8, the temporary support bracket 9 for the main beam is a rectangular cross-section bracket, and the lower end of the bracket is fixed to the top of the arch ring 1.

[0035] As shown in Figures 3 and 4, the two temporary support brackets 9 for the main beams are located between the two lifting frames 8 for the main beams. The distance between the two temporary support brackets for the main beams is less than the distance between the two adjacent piers 2. The heights of the two support brackets 9 for the main beams are equal, and they are higher than the height of the piers 2 but lower than the height of the lifting frames 8 for the main beams.

[0036] (2) As shown in Figures 3 and 9, the beam transport vessel 4 transports the main beam to the bridge. The two winches of the main beam lifting system lower the hoisting ropes to connect the two ends of the first main beam segment 3, and lift the main beam segment to a height higher than the temporary support of the main beam. The traction jack on one end of the load-bearing truss pulls the sliding support to slide to the inside of the bridge to above the temporary support of the main beam. Then the winches lower the main beam segment 3 to the two temporary support supports 9 of the main beam.

[0037] (3) As shown in Figure 10, the cable crane 5 lifts the main beam segment 3 from the temporary support of the main beam and moves it longitudinally along the bridge to the installation position, and lowers the main beam segment onto the two piers 2.

[0038] (4) The traction jack on the other end of the main beam lifting frame pulls the sliding support and winch back to the outside of the bridge, and lifts the second main beam segment to the temporary support of the main beam; as shown in Figure 11, the cable crane 5 returns to lift the second main beam segment 3 to the installation position, and connects the first segment of the main beam with the second segment.

[0039] (5) As shown in Figure 12, repeat step (4) to carry out the subsequent hoisting of the main beam segment 3, in which the main beam segments at the location of the main beam lifting system are hoisted last; when hoisting the last few main beam segments, the cable crane first temporarily hoists these main beam segments onto the main beam that has been installed, then removes the main beam lifting frame and the main beam temporary support bracket, and the cable crane then hoists these main beam segments into place in sequence.

[0040] As shown in Figure 6, in order to ensure that the two ends of the load-bearing truss remain stable when the winch lifts the main beam, a counter-tension anchor rod 10 can be set between the cantilever end of the load-bearing truss 82 extending into the bridge and the arch ring 1. The upper end of the counter-tension anchor rod 10 is anchored to the load-bearing truss 82 by a nut, and the lower end is anchored to the embedded plate on the arch ring 1.

[0041] As shown in Figure 4, in order to reduce the amount of material used in the main beam lifting support, the lower end of the foundation support 81 of one main beam lifting frame 8 can be cast with concrete on the top of the arch ring, and the lower end of the foundation support 81 of the other main beam lifting frame can be directly anchored to the top of a pier 2, with a pier 2 between the two main beam lifting frames.

[0042] Similarly, to reduce the amount of material used for the temporary support brackets of the main beam, the bottom of one temporary support bracket 9 of the main beam can be cast with concrete on the top of the arch ring 1, and the bottom of the other temporary support bracket 9 of the main beam can be directly anchored to the top of the pier column 2 between the two main beam lifting brackets.

[0043] As shown in Figures 7 and 8, in the specific implementation of this invention, in order to ensure that the main beam segment placed on the temporary support is exactly below the cable crane for easy lifting, two slide rails 11 can be installed in the transverse direction at the top of each main beam temporary support 9. A transverse moving flatcar 12 is installed on the two slide rails 11. The bottom of each end of the transverse moving flatcar is provided with two sets of track wheels 121 in the longitudinal direction of the bridge. The track wheels at both ends are supported on the two slide rails. The transverse moving trolley is equipped with a motor to drive the track wheels to move along the slide rails. When the main beam lifting system places the main beam segment on the temporary support, the two ends of the main beam segment are placed on the two transverse moving flatcars. Then, the motor drives the transverse moving flatcars to move along the slide rails to accurately move the main beam segment below the cable crane.

Claims

1. A method for hoisting and constructing the main beam of a long-span, upper-bearing arch bridge, wherein the upper-bearing arch bridge includes an arch ring, and the top of the arch ring is provided with multiple piers for erecting the main beam, characterized in that, Includes the following steps: (1) A main beam lifting system is installed on the arch ring. The main beam lifting system includes two main beam lifting frames and two main beam temporary support brackets. Each main beam lifting frame includes a rectangular cross-section foundation support. The bottom of the foundation support is fixed to the top of the arch ring. A rectangular cross-section load-bearing truss is fixedly installed transversely on the top of the foundation support. The two ends of the load-bearing truss extend to the outer and inner sides of the bridge respectively to form cantilever. A sliding support is installed on the top of the load-bearing truss. A winch is fixedly installed on the sliding support. A reaction seat is installed on the top of the cantilever at both ends of the load-bearing truss. Each reaction seat has a reaction seat on its outer side. A traction jack is set up, and the traction jack is connected to the sliding support through a tie rod; the heights of the two main beam lifting frames are equal and greater than the heights of the piers, and the distance between the two lifting frames is greater than the distance between two adjacent piers; the temporary support for the main beam is a support with a rectangular cross section, and the lower end of the support is fixed to the top of the arch; the two temporary support frames for the main beam are located between the two main beam lifting frames, the distance between the two temporary support frames for the main beam is less than the distance between two adjacent piers, the heights of the two main beam support frames are equal, and are higher than the heights of the piers and lower than the heights of the main beam lifting frames; (2) The beam transport vessel transports the main beam At the bridge, the two winches of the main beam lifting system lowered the hoisting ropes to connect the two ends of the first main beam segment, lifting the main beam segment to a height above the temporary support of the main beam. The traction jacks on one end of the load-bearing truss pull the sliding bearing towards the inside of the bridge to above the temporary support of the main beam. Then the winches lowered the main beam segment onto the two temporary supports; (3) the cable crane lifted the main beam segment from the temporary support of the main beam and moved it longitudinally along the bridge to above the installation position, lowering the main beam segment onto the two piers; (4) the traction jacks on the other end of the main beam lifting frame pulled the sliding bearing towards the bridge. The support and winch are moved back to the outside of the bridge, and the second main beam segment is lifted to the temporary support of the main beam. The cable crane returns and lifts the second main beam segment to the installation position, and connects the first and second main beam segments. (5) Repeat step (4) to carry out the subsequent main beam segment hoisting, among which the main beam segments at the location of the main beam lifting system are hoisted last. When hoisting the last few main beam segments, the cable crane first temporarily lifts these main beam segments onto the main beam that has been installed, and then removes the main beam lifting frame and the temporary support of the main beam. The cable crane then hoists the main beam segments into place in sequence.

2. The method for hoisting and constructing the main beam of a long-span, upper-bearing arch bridge according to claim 1, characterized in that: A counter-tension anchor rod is installed between the cantilever end of the load-bearing truss extending inward and the arch ring. The upper end of the counter-tension anchor rod is anchored to the load-bearing truss by a nut, and the lower end is anchored to the embedded plate on the arch ring.

3. The method for hoisting and constructing the main beam of a long-span, upper-bearing arch bridge according to claim 1, characterized in that: The lower end of the foundation support of one main beam lifting frame of the main beam lifting system is cast in concrete on the top of the arch, while the lower end of the foundation support of the other main beam lifting frame is directly anchored to the top of a pier. There is a pier between the two main beam lifting frames.

4. The method for hoisting and constructing the main beam of a long-span, upper-bearing arch bridge according to claim 3, characterized in that: The bottom of one temporary support bracket for the main beam of the main beam lifting system is cast in concrete on the top of the arch, while the bottom of the other temporary support bracket is directly anchored to the top of the pier between the two main beam lifting brackets.

5. The method for hoisting and constructing the main beam of a long-span, upper-bearing arch bridge according to claim 1, characterized in that: Each main beam temporary support bracket has two transverse rails at the top, with a transverse trolley mounted on each rail. The transverse trolley has two sets of track wheels at its bottom ends along the bridge direction, with the track wheels at both ends supported on the two rails. The transverse trolley is equipped with a motor that drives the track wheels to move along the rails. When the main beam lifting system places the main beam segment onto the temporary support bracket, the two ends of the main beam segment rest on the two transverse trolleys. Then, the motor drives the transverse trolleys to move along the rails, precisely moving the main beam segment under the cable crane.

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