Large-tonnage arch lifting system

Abstract

The utility model relates to a large-tonnage on-arch lifting system which comprises an on-arch supporting system, a lifting frame and a lifting crane, the on-arch supporting system comprises two arch ribs arranged in parallel, the rear end of each arch rib is connected with an arch seat, a cantilever is formed at the front end of each arch rib, a temporary cross brace is welded between the inner sides of the cantilever ends of the two arch ribs, a temporary supporting frame is welded to the position, right opposite to the temporary cross brace, of the outer side of each arch rib, and a lifting frame is installed above the cantilever end of each arch rib. The bottoms of the two sides of each lifting frame are welded to the temporary transverse supports and the temporary supports respectively, and two lifting cranes are installed on each lifting frame. According to the utility model, the arch crane and the cable-stayed buckling system are combined, the structure of the arch crane is optimized, the temporary cross braces are used for supporting and anchoring the lifting frame, and the buckling cables are used for counter-pulling, so that the lifting capacity is greatly improved, the cranes on the side arches on the two banks can be used for lifting the large-section middle arch in a lifting manner, and the construction efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, and relates to the installation and construction of an arch rib of a large-span arch bridge, in particular to a large-tonnage arch lifting system. Background Art

[0002] The arch ribs of large-span arch bridges in mountainous areas are often constructed using the cable crane + inclined-stayed buckle hanging method and the cantilever crane + inclined-stayed buckle hanging method. The cable crane + inclined-stayed buckle hanging method is to divide the arch ribs into multiple segments, lift them one by one with a cable crane and dock them in the air. During the construction process, buckle cables are used to hang the arch rib cantilever, and the arch rib line shape is adjusted by tensioning the buckle cables until the arch ribs are closed. This method is relatively mature, but the cable crane moves slowly, and it is difficult to control the posture of the arch rib segments in the air. It takes an average of 2 days to complete the lifting and buckling of each segment, and the construction efficiency is low.

[0003] The cantilever crane + inclined cable hanging method is to install a section of the arch rib side arch first, then use the cable to hang the arch rib cantilever, temporarily anchor the crane at the front end of the arch rib cantilever, and use the cantilever crane to lift the arch rib segment segment by segment. After each segment is lifted, the crane moves forward and re-anchors it, and lifts the next segment. The construction cycle is repeated until the arch rib is closed. The cantilever crane has a light structure and flexible operation, but its lifting capacity is limited. It can only lift a small segment at a time, and the crane needs to be repeatedly moved and anchored on the arch, which takes a long time and has low construction efficiency. Summary of the invention

[0004] The utility model aims to solve the above problems and provides a large-tonnage arch lifting system, which can lift large-segment arch ribs and improve the efficiency of arch rib installation and construction.

[0005] The technical solution of the utility model is as follows:

[0006] A large-tonnage arch lifting system is used to install the arch ribs by using an oblique pull and buckle hanging method, and is characterized by comprising an arch support system, a lifting frame and a lifting crane;

[0007] The arch support system includes two arch ribs arranged in parallel, the rear end of each arch rib is connected to the arch seat, and the front end forms a cantilever, a temporary cross brace is welded between the inner sides of the cantilever ends of the two arch ribs, and a temporary support frame is welded on the outer side of each arch rib facing the temporary cross brace;

[0008] The lifting frame comprises two parallel rhombus truss pieces, each rhombus truss piece comprises an upper chord and a lower chord, a vertical strut is welded between the rear end of the upper chord and the front end of the lower chord, a rear diagonal strut is welded between the rear end of the upper chord and the rear end of the lower chord, a front diagonal strut is welded between the front end of the upper chord and the rear end of the lower chord, a plurality of connecting rods are welded between the two truss pieces, a crossbeam is welded between the top surfaces of the front ends of the upper chords of the two truss pieces, and two lifting cranes are mounted on the crossbeam;

[0009] A lifting frame is installed above the cantilever end of each arch rib, the lower chord of one truss piece of each lifting frame is welded to the temporary cross brace on the inner side of the arch rib, the lower chord of another truss piece is welded to the temporary support on the outer side of the arch rib, and the front ends of the upper chords of the two truss pieces protrude in front of the cantilever end of the arch rib.

[0010] Furthermore, the above-mentioned large-tonnage arch lifting system can weld an anchor block on the inner side of the welding point between the upper chord and the vertical support rod of the two truss plates of the lifting frame, and the anchor block is anchored to the front end of a cable, and the rear end of the cable is anchored to the tower of the inclined cable hanging system.

[0011] Furthermore, in the above-mentioned large-tonnage arch hoisting system, the temporary cross brace and temporary support both adopt a spatial truss structure.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The arch crane is combined with the inclined-stayed buckle system, and the arch crane is installed on the side arch cantilever. The structure of the arch crane is optimized, and a temporary cross brace is used to support and anchor the arch crane. At the same time, the buckle cable of the inclined-stayed buckle system is used to reversely pull the crane, which greatly increases the lifting capacity of the arch crane. The crane does not need to be repeatedly moved and anchored on the arch rib. The cranes on the side arches on both sides can lift larger middle arch segments at one time by lifting, which can greatly improve the construction efficiency and has high construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a transverse bridge elevation view of the utility model;

[0015] Figure 2 It is a side structure schematic diagram of the utility model;

[0016] Figure 3 It is a schematic diagram of the construction state of the utility model. DETAILED DESCRIPTION

[0017] like Figure 1 , Figure 2 As shown, the utility model includes an arch support system, a lifting frame and a lifting crane;

[0018] The arch support system comprises two arch ribs 1 arranged in parallel, the rear end of each arch rib is connected to the arch seat, and the front end forms a cantilever, a temporary cross brace 2 is welded between the inner sides of the cantilever ends of the two arch ribs 1, and a temporary support frame 3 is welded on the outer side of each arch rib facing the temporary cross brace;

[0019] The lifting frame 4 includes two parallel rhombus truss pieces, each rhombus truss piece includes an upper chord 41 and a lower chord 42, a vertical support rod 43 is welded between the rear end of the upper chord 41 and the front end of the lower chord 42, a rear diagonal support rod 44 is welded between the rear end of the upper chord 41 and the rear end of the lower chord 42, a front diagonal support rod 45 is welded between the front end of the upper chord 41 and the rear end of the lower chord 42, a plurality of connecting rods 46 are welded between the two truss pieces, a crossbeam 47 is welded between the top surfaces of the front ends of the upper chords 41 of the two truss pieces, and two lifting cranes 5 are installed on the crossbeam 47, and the lifting cranes can be winches or through-hole jacks;

[0020] A lifting frame 4 is installed above the cantilever end of each arch rib 1, and the lower chord 42 of a truss piece of each lifting frame 4 is welded to the temporary cross brace 2 on the inner side of the arch rib, and the lower chord 42 of another truss piece is welded to the temporary support 3 on the outer side of the arch rib, and the front ends of the upper chords 41 of the two truss pieces protrude in front of the cantilever end of the arch rib 1.

[0021] During the specific implementation of the utility model, in order to prevent the lifting frame from tipping forward due to excessive force on the front end when lifting heavy objects, an anchor block 48 is welded to the inner side of the welding point between the upper chord 41 and the vertical support rod 43 of the two truss plates of the lifting frame, and the anchor block 48 is anchored to the front end of a cable 6, and the rear end of the cable is anchored to the cable tower of the inclined cable hanging system.

[0022] When the utility model is implemented, in order to reduce the deadweight of the temporary cross brace and the temporary support frame, the temporary cross brace 2 and the temporary support frame 3 both adopt a space truss structure.

[0023] like Figure 3 As shown, during the construction of the arch rib of a large-span arch bridge, the side arch ribs 1 on both sides of the arch rib are symmetrically installed by using a cable crane + inclined-stayed buckle hanging method. After the side arch is installed, a temporary cross brace and a temporary bracket are lifted by a cable crane and welded to the front cantilever of the arch rib side arch; the lifting frame is welded on the ground, and is lifted by a cable crane to the top of the side arch cantilever and fixed with the temporary cross brace and the temporary bracket by welding. The lifting crane is installed on the lifting frame, and the buckle cable 6 is installed between the buckle tower and the anchor block on the lifting frame 4 and pre-tensioned to complete the installation of the large-tonnage arch lifting system;

[0024] While installing the side arches, assemble the large-segment arch rib middle arch 7 on the ground, and transport the assembled large-segment middle arch 7 to the bottom of the installation position; the lifting cranes on the side arches on both sides lower the lifting ropes at the same time, and lift the large-segment middle arch to the installation position by lifting and welding it to the two side arches.

Claims

1. A large-tonnage arch lifting system, used to install arch ribs by inclined pull and buckle hanging, characterized by: Including arch support system, lifting frame and lifting crane; The arch support system includes two arch ribs arranged in parallel, the rear end of each arch rib is connected to the arch seat, and the front end forms a cantilever, a temporary cross brace is welded between the inner sides of the cantilever ends of the two arch ribs, and a temporary support frame is welded on the outer side of each arch rib facing the temporary cross brace; The lifting frame comprises two parallel rhombus truss pieces, each rhombus truss piece comprises an upper chord and a lower chord, a vertical strut is welded between the rear end of the upper chord and the front end of the lower chord, a rear diagonal strut is welded between the rear end of the upper chord and the rear end of the lower chord, a front diagonal strut is welded between the front end of the upper chord and the rear end of the lower chord, a plurality of connecting rods are welded between the two truss pieces, a crossbeam is welded between the top surfaces of the front ends of the upper chords of the two truss pieces, and two lifting cranes are mounted on the crossbeam; A lifting frame is installed above the cantilever end of each arch rib, the lower chord of one truss piece of each lifting frame is welded to the temporary cross brace on the inner side of the arch rib, the lower chord of another truss piece is welded to the temporary support on the outer side of the arch rib, and the front ends of the upper chords of the two truss pieces protrude in front of the cantilever end of the arch rib.

2. The large-tonnage overhead lifting system according to claim 1 is characterized in that: An anchor block is welded to the inner side of the welding point between the upper chord and the vertical support rod of the two truss plates of the lifting frame, and the anchor block is anchored to the front end of a cable, and the rear end of the cable is anchored to the tower of the inclined stay hanging system.

3. The large-tonnage overhead lifting system according to claim 1 is characterized in that: The temporary cross brace and temporary support both adopt a space truss structure.

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