Cable-track beam transportation system and construction method for installation of main beam of cross-valley steel arch bridge

Abstract

The present invention provides a track cable type beam transporting system and a construction method for the installation of the main beam of a cross-valley steel arch bridge. A plurality of load-bearing cables are anchored to the arch seats on both banks to form a track cable system. A beam transporting vehicle is arranged on the load-bearing cables, and a winch is respectively arranged on both banks to tow the beam transporting vehicle to slide along the load-bearing cables. The main beam segments are placed on the beam transporting vehicle and transported to the position below the installation location. The lengthened permanent sling of the main beam is connected to the main beam, and a continuous jack is arranged at the anchoring end of the permanent sling and the arch rib to lift the main beam to the installation position. Compared with the construction method of a cable crane, the construction cost is low, the speed is fast, and the construction safety can be ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction, and relates to the construction of a steel structure arch bridge spanning a valley. Specifically, it relates to a track cable type beam transportation system and construction method for installing the main beam of a valley-crossing steel arch bridge. Background Art

[0002] Steel structure arch bridges are usually constructed by the method of first arch and then beam. First, the arch ribs are installed, the suspenders are installed on the arch ribs, and then the main beam segments are successively hoisted below the arch ribs and connected to the suspenders. For steel structure arch bridges spanning navigable rivers, floating cranes or ships can generally be used to transport the main beam. For steel structure arch bridges spanning valleys, due to the complex terrain of the bridge site and the harsh construction environment, usually only a cable crane system can be used to hoist the main beam. The cable crane system requires the construction of special cable towers and large anchor piers, with high construction costs, long cycles, and relatively high construction difficulties and safety risks. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and provide a track cable type beam transportation system and construction method for installing the main beam of a valley-crossing steel arch bridge, so as to reduce construction costs and speed up the construction progress.

[0004] A track cable type beam transportation system for installing the main beam of a valley-crossing steel arch bridge provided by the present invention is characterized in that it includes a track cable system, a beam transportation vehicle, and a traction system;

[0005] The track cable system includes multiple load-bearing cables. At least 7 load-bearing cables are respectively arranged in parallel below the arch ribs on both sides of the steel arch bridge, with a certain distance between adjacent load-bearing cables. The two ends of each load-bearing cable are respectively anchored on the arch seats at both ends of the arch rib; among the load-bearing cables below each side of the arch rib, the 4 cables close to the inner side of the bridge are used to support the beam transportation vehicle;

[0006] There are 4 beam transportation vehicles, with 2 vehicles arranged below each side of the arch rib; each beam transportation vehicle includes 4 track cable type pulleys. Each track cable type pulley includes a pulley bracket, and two pulleys are respectively arranged at the bottom of both sides of the pulley bracket. The pulley is circumferentially provided with a wheel groove with an arc-shaped cross-section, and the diameter of the wheel groove is greater than the diameter of the load-bearing rope; the 4 track cable type pulleys of each beam transportation vehicle are arranged in parallel in pairs. A cross beam is fixedly connected between the upper ends of the pulley brackets of each two parallel track cable pulleys, and two longitudinal beams are fixedly connected between the two cross beams of each beam transportation vehicle; the 4 pulleys arranged longitudinally along the cross beam of each beam transportation vehicle are respectively supported on the 4 load-bearing cables close to the inner side of the bridge; there is a certain distance between the two beam transportation vehicles below each side of the arch rib, and the opposite ends of the two beam transportation vehicles are connected by a steel wire rope;

[0007] The traction system includes 4 winches, with one winch fixedly arranged on the top surface of the arch seat at both ends of each side of the arch rib respectively. The 4 winches are respectively connected to the 4 beam transportation vehicles through traction ropes along the longitudinal direction of the arch rib.

[0008] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, the trolley support of the cable-track type trolley is triangular, and the four pulleys of the cable-track type trolley are respectively arranged on both sides of the two bottom corners of the triangular trolley support, and the two pulleys on both sides of the same bottom corner of the triangular trolley support are coaxial.

[0009] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, the triangular trolley support is formed by welding three steel sections into a triangle, or by using two triangular steel plates with the middle part cut into a hollow shape, and the two triangular steel plates are welded and connected through a connecting plate.

[0010] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, at least three stabilizing beams are arranged at the bottom of multiple load-bearing cables in the transverse bridge direction, with a certain distance between adjacent stabilizing beams, and both ends of each stabilizing beam are respectively connected to the two arch ribs through temporary suspension cables, and the load-bearing cables are supported on the stabilizing beams.

[0011] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, the stabilizing beam is of a triangular truss structure, with one outer side of the triangular truss facing upwards, and the load-bearing cables are supported on the two upper chord bars of the stabilizing beam.

[0012] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, a vertical bar is fixedly arranged at each end of the two upper chord bars of the stabilizing beam, a cross bar is connected between the two vertical bars at each end of the stabilizing beam, a lower ear plate is welded in the middle of the top of the cross bar, and an upper ear plate is welded on the outer webs of the two arch ribs corresponding to both ends of each stabilizing beam, and both ends of the temporary suspension cable are respectively connected to the lower ear plate and the upper ear plate through bolts.

[0013] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, a load-bearing cable support frame is arranged on the two upper chord bars of each stabilizing beam corresponding to the four load-bearing ropes supporting the beam transportation vehicle. The load-bearing cable support frame includes a bottom plate, the bottom plate is welded or bolted and fixed to the upper chord bar of the stabilizing beam, a support plate is vertically welded on the bottom plate, and an arc-shaped limiting groove is arranged at the top of the support plate, and the load-bearing cable is stuck in the arc-shaped limiting groove at the top of the support plate.

[0014] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, among the multiple load-bearing cables under each arch rib, except for the four load-bearing cables supporting the beam transportation vehicle, a catwalk is erected longitudinally on the remaining load-bearing cables, and guardrails are respectively arranged on both sides of the catwalk.

[0015] Furthermore, in the above-mentioned cable-track type beam transportation system for the installation of the main girder of a valley-crossing steel arch bridge, a spherical bearing is arranged on the top surface of each beam transportation vehicle; the spherical bearing includes a base, a hinge ball and a top support, arc-shaped grooves are respectively arranged on the top surface of the base and the bottom surface of the top support, the hinge ball is rotatably arranged in the groove on the base, and the groove on the bottom surface of the top support is buckled on the top of the hinge ball.

[0016] The construction method for installing the main girder of a steel structure arch bridge by using the above-mentioned track cable type beam transporting system for installing the main girder of a cross-valley steel arch bridge is characterized by including the following steps:

[0017] (1) A main girder assembly platform is arranged under the arch rib at one end of the bridge, and the main girder is assembled in sections;

[0018] (2) The winch located at one end of the bridge where the main girder assembly platform is arranged pulls the beam transporting vehicle to move to the main girder assembly platform, hoists a main girder section onto 4 beam transporting vehicles, and binds it to the beam transporting vehicles or temporarily fixes it with bolts;

[0019] (3) The winch at the other end of the bridge pulls the beam transporting vehicle to move along the load-bearing cable, and transports the main girder section to below the installation position; during the movement of the beam transporting vehicle, the winch at one end of the main girder assembly platform provides a certain reverse pulling force, so that the connecting steel wire rope between the two beam transporting vehicles is always in a stressed state;

[0020] (4) The lower end of the permanent lifting cable of the main girder is connected to the lifting lug on the main girder section, a continuous jack is inserted through the anchoring end of each permanent lifting cable of the main girder and the arch rib, each continuous jack synchronously lifts the main girder section to the installation position, and then the upper end of the permanent lifting cable is anchored to the arch rib to complete the installation of one main girder section;

[0021] (5) The winch at the main girder assembly platform end pulls the beam transporting vehicle back to the main girder assembly platform, and transports and installs the next main girder section according to the methods in steps (2) to (4) until all the main girder sections are installed.

[0022] The present invention makes full use of the mechanical properties of the rock at the bridge abutment to anchor the load-bearing cable, uses the load-bearing cable as the track for the beam transporting vehicle, realizes the rapid transportation and installation of the main girder sections of the steel structure arch bridge, has a fast construction speed and low cost. The track cable type beam transporting system of the present invention has clear structural stress and simple operation. Combining with the design principle of the catwalk of the suspension bridge, a construction passage is arranged on both sides below the two arch ribs by using the load-bearing cable, which can realize the passage of personnel on both banks, ensure the high-altitude construction safety of the operating personnel, and reduce the safety risk. Description of the Drawings

[0023] Figure 1 is the side view of the track cable type beam transporting system along the bridge axis;

[0024] Figure 2 is the elevation view of the track cable type beam transporting system across the bridge axis;

[0025] Figure 3 is the partial side view of the track cable type beam transporting system;

[0026] Figure 4 is the partial elevation view of the track cable type beam transporting system;

[0027] Figure 5 It is a side view of a beam transporter;

[0028] Figure 6 It is an elevation view of a beam transporter. Specific embodiments

[0029] As Figure 1 shown, the arch rib 1 of the cross-valley steel structure arch bridge has been installed, and the arch seats 2 at both ends of the arch rib are cast on the rock formations on both banks. As Figures 1 to 6 shown, the cable-track type beam transporting system provided by the present invention includes a cable-track system, a beam transporter, and a traction system.

[0030] The cable-track system includes multiple load-bearing cables 3. At least 7 load-bearing cables are arranged in parallel respectively under the arch ribs 1 on both sides of the steel arch bridge, with a certain distance between adjacent load-bearing cables. Cable anchors are preset during the casting of the arch seats. Both ends of each load-bearing cable 3 are respectively anchored on the arch seats 2 at both ends of the arch rib; among the load-bearing cables under each side of the arch rib, the 4 cables close to the inner side of the bridge are used to support the beam transporter;

[0031] There are 4 beam transporters, with 2 arranged under each side of the arch rib; each beam transporter 4 includes 4 cable-track type pulleys 41. Each cable-track type pulley 41 includes a pulley bracket 411. Two pulleys 412 are respectively arranged at the bottom of both sides of the pulley bracket. The pulley is circumferentially provided with a wheel groove with an arc-shaped cross-section, and the diameter of the wheel groove is greater than the diameter of the load-bearing rope; the 4 cable-track type pulleys of each beam transporter 4 are arranged in parallel in pairs. A cross beam 42 is fixedly connected between the upper ends of the pulley brackets 411 of each two parallel cable-track pulleys. Two longitudinal beams 43 are fixedly connected between the two cross beams 42 of each beam transporter; the 4 pulleys 412 arranged longitudinally along the cross beam of each beam transporter are respectively supported on the 4 load-bearing cables 3 close to the inner side of the bridge, and the load-bearing cable is located in the wheel groove of the pulley; there is a certain distance between the two beam transporters 4 under each side of the arch rib, and the opposite ends of the two beam transporters are connected by a steel wire rope 5;

[0032] The traction system includes 4 winches 6, and one is fixedly arranged on the top surface of the arch seat 2 at both ends of each side of the arch rib respectively. The 4 winches are respectively connected to the 4 beam transporters 4 through traction ropes 7 along the longitudinal direction of the arch rib.

[0033] With the above structure, the two winches 6 located at one end of the bridge can synchronously traction the beam transporter 4 to slide along the load-bearing cable 3 towards the other end of the bridge. Place the bridge deck main beam segment on the beam transporter, so that the main beam segment can be transported to the position below the installation location. The load-bearing cable serves as the track for the beam transporter to slide and is stuck in the wheel groove of the pulley of the beam transporter, which can prevent the beam transporter from derailing during sliding.

[0034] In the specific implementation of the present invention, the trolley support 411 of the track cable trolley can adopt a triangular structure. The four pulleys 412 of the track cable trolley are respectively arranged on both sides of the two bottom corners of the triangular trolley support. The two pulleys 412 on both sides of the same bottom corner of the triangular trolley support are coaxial, so that the two pulleys can rotate synchronously. The triangular trolley support structure can improve the stability of the trolley.

[0035] Furthermore, in order to reduce the self-weight of the trolley support, the triangular trolley support 411 can be formed by welding three sections of steel into a triangle, or two triangular steel plates can be used. The middle of the triangular steel plates is cut into a hollow shape, and the two triangular steel plates are welded and connected through a connecting plate.

[0036] In the specific implementation of the present invention, in order to ensure the stability of the beam transporting vehicle when sliding along the load-bearing cable, at least three stabilizing beams 8 can be arranged transversely under the bottom of multiple load-bearing cables. There is a certain distance between adjacent stabilizing beams. Both ends of each stabilizing beam are respectively connected to the two arch ribs through temporary suspension cables 9, and the load-bearing cable is supported on the stabilizing beam.

[0037] Furthermore, in order to reduce the self-weight of the stabilizing beam 8 and ensure its mechanical properties, the stabilizing beam 8 can adopt a triangular truss structure. One outer side of the triangular truss faces upward, and the load-bearing cable is supported on the two upper chord members of the stabilizing beam.

[0038] By adopting the above-mentioned triangular truss type stabilizing beam, a vertical rod 81 can be fixedly arranged at both ends of the two upper chord members respectively. A cross bar 82 is connected between the two vertical rods at each end of the stabilizing beam; a lower ear plate 83 is welded in the middle of the top of the cross bar. Upper ear plates are welded on the outer webs of the two arch ribs 1 corresponding to both ends of each stabilizing beam respectively. Both ends of the temporary suspension cable 9 are connected to the lower ear plate and the upper ear plate through bolts or shackles.

[0039] Furthermore, in order to prevent the load-bearing cable from sliding laterally on the stabilizing beam, thereby maintaining the stability of the beam transporting vehicle when sliding along the load-bearing cable, a load-bearing cable support frame 10 can be arranged on the two upper chord members of each stabilizing beam 8 corresponding to the four load-bearing ropes supporting the beam transporting vehicle. The load-bearing cable support frame 10 includes a bottom plate 101. The bottom plate 101 is welded or bolted and fixed to the upper chord member of the stabilizing beam. A support plate 102 is vertically welded on the bottom plate. An arc-shaped limiting groove is arranged at the top of the support plate. The load-bearing cable 3 is stuck in the arc-shaped limiting groove at the top of the support plate 102. In specific implementation, in order to enable the support plate to pass through the wheel groove of the beam transporting vehicle pulley, the width of the support plate is preferably equal to or less than the diameter of the load-bearing cable.

[0040] In the specific implementation of the present invention, for the convenience of construction workers to pass between the two ends of the bridge, among the multiple load-bearing cables under each arch rib, except for the 4 load-bearing cables supporting the beam transporting vehicle, a catwalk 11 can be erected longitudinally along the bridge on the remaining load-bearing cable 3, and guardrails 12 are respectively arranged on both sides of the catwalk. The structure of the catwalk is similar to that of the catwalk in cable-suspended crane construction, and the catwalk panel is fixed to the load-bearing cable through U-bolts 13.

[0041] Since the load-bearing cable 3 has a certain sag, in the specific implementation of the present invention, to ensure that the main beam segment can remain balanced on the beam transporting vehicle when the beam transporting vehicle slides along the load-bearing cable, a spherical bearing 14 can be arranged on the top surface of each beam transporting vehicle. The spherical bearing 14 includes a base 141, a hinge ball 142, and a top bracket 143. Arc-shaped grooves are respectively arranged on the top surface of the base and the bottom surface of the top bracket. The hinge ball is rotatably arranged in the groove on the base, and the groove on the bottom surface of the top bracket is buckled on the top of the hinge ball. When the beam transporting vehicle transports the main beam segment, the main beam segment is supported on the top bracket of the spherical bearing. When the beam transporting vehicle tilts, the hinge ball can rotate in the groove of the base to keep the top bracket horizontal, so that the main beam segment on the top bracket remains balanced.

[0042] When using the above rail-cable type beam transporting system to transport and install the main beam of a steel structure arch bridge, the specific construction method is as follows:

[0043] (1) As Figure 1 shown, a main beam assembly platform 15 is set under the arch rib 1 at one end of the bridge, and the main beam is assembled in segments;

[0044] (2) The winch 6 located at the end of the bridge where the main beam assembly platform is set pulls the beam transporting vehicle 4 to move along the load-bearing cable 3 to the main beam assembly platform, and hoists a main beam segment onto 4 beam transporting vehicles;

[0045] (3) The winch 6 at the other end of the bridge pulls the beam transporting vehicle 4 carrying the main beam segment 16 to move along the load-bearing cable 3 to the position below the installation location; during the movement of the beam transporting vehicle, the winch located at the end of the main beam assembly platform provides a certain reverse tension to keep the connecting steel wire rope 5 between the two beam transporting vehicles always in a stressed state;

[0046] (4) Connect the lower end of the permanent lifting cable 17 of the main beam to the lifting lug on the main beam segment. Pass a continuous jack 18 through the anchorage end of each permanent lifting cable 17 of the main beam and the arch rib 1. Synchronously lift the main beam segment to the installation position by each continuous jack, and then anchor the upper end of the permanent lifting cable to the arch rib to complete the installation of one main beam segment;

[0047] (5) The winch located at the end of the main beam assembly platform pulls the beam transporting vehicle back to the main beam assembly platform, and transports and installs the next main beam segment according to the methods in steps (2) to (4) until all main beam segments are installed.

Claims

1. A cable-track type beam transportation system for the installation of the main beam of a cross-valley steel arch bridge, characterized in that: It includes a track cable system, a beam transporter, and a traction system; The track cable system includes multiple load-bearing cables. At least 7 load-bearing cables are arranged in parallel respectively under the arch ribs on both sides of the steel arch bridge. There is a certain distance between adjacent load-bearing cables. Both ends of each load-bearing cable are respectively anchored on the arch seats at both ends of the arch rib; among the load-bearing cables under each side of the arch rib, the 4 cables close to the inner side of the bridge are used to support the beam transporter; There are 4 beam transporters, and 2 are arranged under each side of the arch rib; each beam transporter includes 4 track cable type pulleys. Each track cable type pulley includes a pulley support bracket. Two pulleys are respectively arranged at the bottom of both sides of the pulley support bracket. The pulley is circumferentially provided with an arc-shaped groove in cross-section, and the diameter of the groove is greater than the diameter of the load-bearing cable; the 4 track cable type pulleys of each beam transporter are arranged in parallel in pairs. A cross beam is fixedly connected between the upper ends of the pulley support brackets of each two track cable type pulleys arranged in parallel. Two longitudinal beams are fixedly connected between the two cross beams of each beam transporter; the 4 pulleys arranged longitudinally along the cross beam of each beam transporter are respectively supported on the 4 load-bearing cables close to the inner side of the bridge; there is a certain distance between the two beam transporters under each side of the arch rib, and the opposite ends of the two beam transporters are connected by a steel wire rope; A spherical bearing is arranged on the top surface of each beam transporter; the spherical bearing includes a base, a hinge ball, and a top bracket. Arc-shaped grooves are respectively arranged on the top surface of the base and the bottom surface of the top bracket. The hinge ball is rotatably arranged in the groove on the base, and the groove on the bottom surface of the top bracket buckles on the top of the hinge ball; The traction system includes 4 winches, and one is fixedly arranged on the top surface of the arch seat at both ends of each side of the arch rib respectively. The 4 winches are respectively connected to the 4 beam transporters through traction ropes along the longitudinal direction of the arch rib.

2. The cable-track beam transportation system for the installation of the main beam of a cross-valley steel arch bridge according to claim 1, characterized in that: The pulley support bracket of the track cable type pulley is triangular. The 4 pulleys of the track cable type pulley are respectively arranged on both sides of the two bottom corners of the triangular pulley support bracket, and the two pulleys on both sides of the same bottom corner of the triangular pulley support bracket are coaxial.

3. The cable-track beam transportation system for the installation of the main beam of a cross-valley steel arch bridge according to claim 2, wherein: The triangular pulley support bracket is welded into a triangle by 3 steel sections, or consists of two triangular steel plates. The middle of the triangular steel plates is cut into a hollow shape, and the two triangular steel plates are welded and connected by a connecting plate.

4. The cable-track beam transportation system for the installation of the main beam of a cross-valley steel arch bridge according to claim 1, characterized in that: At least 3 stabilizing beams are arranged at the bottom of the multiple load-bearing cables in the transverse bridge direction. There is a certain distance between adjacent stabilizing beams. Both ends of each stabilizing beam are respectively connected to the two arch ribs through temporary suspension cables, and the load-bearing cables are supported on the stabilizing beams.

5. The cable-track beam transportation system for installing the main beam of a cross-valley steel arch bridge according to claim 4, characterized in that: The stabilizing beam is of a triangular truss structure. One outer side of the triangular truss faces upwards, and the load-bearing cables are supported on the two upper chord bars of the stabilizing beam.

6. The cable-track type beam transporting system for the installation of the main beam of a cross-valley steel arch bridge according to claim 5, characterized in that: Vertical bars are respectively fixedly arranged at both ends of the two upper chord bars of the stabilizing beam. A cross bar is connected between the two vertical bars at each end of the stabilizing beam. An ear plate is welded in the middle of the top of the cross bar. Upper ear plates are respectively welded on the outer webs of the two arch ribs corresponding to both ends of each stabilizing beam. Both ends of the temporary suspension cable are respectively connected to the lower ear plate and the upper ear plate through bolts.

7. The cable-track beam transportation system for the installation of the main beam of a cross-valley steel arch bridge according to claim 5, characterized in that: A load-bearing cable support frame is respectively arranged on the two upper chord bars of each stabilizing beam corresponding to the 4 load-bearing cables supporting the beam transporter. The load-bearing cable support frame includes a bottom plate, and the bottom plate is welded or bolted and fixed to the upper chord bar of the stabilizing beam. A support plate is vertically welded on the bottom plate, and an arc-shaped limiting groove is arranged at the top of the support plate. The load-bearing cable is stuck in the arc-shaped limiting groove at the top of the support plate.

8. The cable-track beam transportation system for the installation of the main beam of a cross-valley steel arch bridge according to claim 1, characterized in that: Among the multiple load-bearing cables under each arch rib, except for the 4 load-bearing cables supporting the beam transporter, a catwalk is erected longitudinally along the bridge on the remaining load-bearing cables, and guardrails are respectively arranged on both sides of the catwalk.

9. A construction method for installing the main beam of a cross-valley steel arch bridge, adopting the track-cable type beam transportation system described in any one of the above claims 1-8, characterized in that, It includes the following steps: (1) A main beam assembly platform is set under the arch rib at one end of the bridge, and the main beam is assembled in segments. (2) The winch located at one end of the bridge where the main beam assembly platform is set pulls the beam transporter to move to the main beam assembly platform, hoists a main beam segment onto the 4 beam transporters, and binds it to the beam transporter or temporarily fixes it with bolts. (3) The winch at the other end of the bridge pulls the beam transporter to move along the load-bearing cable, and transports the main beam segment to the position below the installation location; during the movement of the beam transporter, the winch at one end of the main beam assembly platform provides a certain reverse pulling force to keep the connecting steel wire rope between the two beam transporters in a stressed state all the time. (4) Connect the lower end of the permanent sling of the main beam to the lifting lug on the main beam segment, insert a continuous jack through the anchoring end of each permanent sling of the main beam and the arch rib, synchronously lift the main beam segment to the installation location by each continuous jack, and then anchor the upper end of the permanent sling to the arch rib to complete the installation of one main beam segment. (5) The winch at the main beam assembly platform end pulls the beam transporter back to the main beam assembly platform, and transports and installs the next main beam segment according to the methods in steps (2) to (4) until all the main beam segments are installed.

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