Super-large-specification back rope bundling system

Abstract

The utility model discloses a backstay bundling system with an ultra-large specification. The back cable is used for connecting and supporting the tower end of the bridge tower and the bridge deck beam end and is formed by stranding steel strands, the tower end is a back cable fixing end, and the beam end is a back cable tensioning end; from the beam end to the tower end, the back cable steel strand sequentially penetrates through the following components: a tensioning end anchorage device, a beam end anchor bearing plate, a beam end cable guide pipe, a beam end wire separating plate, a tower end cable guide pipe, a tower end wire separating plate, a tower end anchor bearing plate and a fixed end anchorage device; the cable guide pipes are of thick-wall steel cylinder structures, and the wire separating plates are welded and fixed in the cable guide pipes; two side surfaces of the wire separating plate are fixedly welded with the inner wall of the steel cylinder, and stop blocks are welded at the junctions of the two side surfaces and the inner wall of the steel cylinder for reinforcing and fixing; seven regional perforation groups are symmetrically arranged along the center of the plate surface of the wire separating plate, and the central group and the central group are symmetrically arranged around six groups. According to the super-large-specification back cable bundling system, the back cable has a bevel bundling function, the split steel strand back cables are finally combined into a whole, and the bundling problem of a large number of steel strands is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge structure design, and relates to a bridge cable steel strand bundling device, in particular to an oversized back cable bundling system. Background Art

[0002] A cable-stayed bridge consists of three parts: bridge towers, bridge cables and bridge decks. The bridge cables are the main components of a cable-stayed bridge, which bear the load of the bridge deck and maintain the shape of the bridge deck. The bridge cables are usually made of high-strength steel wire ropes or cables, and are fixed through cable grooves or cable holes connecting the bridge towers and the bridge deck.

[0003] With the rapid development of construction technology, bridge structure design is also constantly innovating. While bridges have a beautiful appearance, the structural stress has become more complicated. In the bridge projects that have been built with steel strand cable structures, the maximum number of holes for steel strand cables is only 156, the maximum design cable force is 1828 tons, and the outer diameter of the steel strand is 315mm, which cannot meet the design requirements of larger cable forces. Therefore, there is an urgent need for a new type of bridge cable bundling device that meets the installation requirements of larger cable bodies, has a simple structure, and is easy to operate. Summary of the invention

[0004] The utility model discloses an ultra-large-size back cable bundling system. The utility model aims to provide a bundling system that meets the ultra-large-size cable body, and is used to solve the problems of large cable force, complex structure and difficult installation of steel strands in the existing technology.

[0005] The utility model is realized by the following technical solutions:

[0006] A super-large back cable cluster system for bridges, wherein the back cables are used to connect the tower ends of supporting bridge towers and the beam ends of bridge decks, and are characterized in that: the back cables are composed of stranded steel wires, the tower end is the fixed end of the back cables, and the beam end is the tensioning end of the back cables; from the beam end to the tower end, the steel wires constituting the back cables pass through the following components in sequence: tensioning end anchor, beam end anchor pad, beam end cable duct, beam end wire dividing plate, tower end cable duct, tower end wire dividing plate, tower end anchor pad, and fixed end anchor.

[0007] Furthermore, the beam-end cable duct and the tower-end cable duct are both thick-walled steel cylinder structures made of forged steel; the beam-end wire splitter plate is welded and fixed to the steel cylinder outlet end of the beam-end cable duct near the beam end; the tower-end wire splitter plate is welded and fixed to the steel cylinder outlet end of the tower-end cable duct near the tower end.

[0008] Furthermore, both side surfaces of the beam end wire splitter plate and the tower end wire splitter plate are welded and fixed to the inner wall of the steel cylinder, and blocks are welded and arranged at the junctions of the both side surfaces and the inner wall of the steel cylinder for reinforcement and fixation.

[0009] Furthermore, the beam end wire dividing plate and the tower end wire dividing plate are both symmetrically arranged with seven groups of regional perforation groups along the center of the plate surface, with one group in the center and six groups symmetrically arranged around the center group; each group is composed of several identical, adjacent holes equidistant and densely distributed independent through holes, and the steel strands constituting the back cable are combined into seven strands, and each steel strand constituting each strand passes through the seven groups of independent through holes in the beam end wire dividing plate section and the tower end wire dividing plate section respectively.

[0010] Furthermore, the tower end anchor plate is fixed inside the tower end of the bridge tower, and the beam end anchor plate is fixed to the bottom of the beam end; seven groups of reserved holes are opened on the tower end anchor plate and the beam end anchor plate to meet the needs of each strand of steel wire passing through.

[0011] Furthermore, the steel strand is a prestressed steel strand with a single filament coated with an epoxy coating. One end of the steel strand passes through a tower-end cable guide tube and the other end passes through a beam-end cable guide tube. An outer sheath tube is provided between the tower-end cable guide tube and the beam-end cable guide tube for anti-corrosion protection. Cable hoops are also used to fix the outer periphery of the steel strand at both ends of the outer sheath tube.

[0012] Furthermore, after the steel strand is tensioned, both ends are clamped and fixed by a tensioning end anchor and a fixed end anchor respectively. The fixed end anchor is supported on a tower end anchor pad, and the tensioning end anchor is supported on a beam end anchor pad.

[0013] The utility model has the following beneficial effects: the super-large-size back cable bundling system of the utility model enables the back cables to have the function of corner bundling, and finally combines the stranded steel strand back cables into a whole, thus solving the problem of bundling a large number of steel strands. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the installation of a bridge back cable.

[0015] Figure 2 This is a schematic diagram of the structure of the back cable clustering system of the utility model.

[0016] Figure 3 It is a schematic cross-sectional view of the cable guide structure of the utility model.

[0017] Figure 4 It is a schematic diagram of the installation cross section of the steel strand of the utility model.

[0018] Figure 5 It is a schematic cross-sectional view of the installation of the tower end wire dividing plate of the utility model.

[0019] Figure 6 It is a cross-sectional schematic diagram of the tower end wire dividing plate of the utility model.

[0020] Figure 7 It is a cross-sectional schematic diagram of the installation of the beam end wire dividing plate of the utility model.

[0021] Figure 8 It is a schematic cross-sectional view of the wire dividing plate at the beam end of the utility model.

[0022] Fig. 9 It is a schematic cross-sectional view of the tower end anchor pad of the utility model.

[0023] Fig.10 It is a schematic cross-sectional view of the beam end anchor pad of the utility model.

[0024] Explanation of the figure numbers: 101 is the cable duct at the tower end, 102 is the cable duct at the beam end, 2 is the steel strand, 301 is the wire dividing plate at the tower end, 302 is the wire dividing plate at the beam end, 401 is the anchor plate at the tower end, 402 is the anchor plate at the beam end, 501 is the fixed end anchor, 502 is the tensioning end anchor, 6 is the cable clamp, 7 is the outer sheath pipe, 8 is the block, YD is the reserved hole diameter, MD is the outer diameter of the anchor, LD is the outer diameter of the nut, d is the wall thickness of the cable duct, T is the tower end, L is the beam end, and S is the back cable. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies identical or similar to the present invention do not exceed the scope of protection of the present invention.

[0026] As shown in the figure, the super-large-size back cable bundle system of this embodiment is used for the installation of the back cable S steel strand of the cable-stayed bridge. The back cable S is an important load-bearing component connecting the bridge tower and the bridge deck, wherein the tower end T belongs to the fixed end of the steel strand, and the beam end L belongs to the tensioning end of the steel strand. From the beam end L to the tower end T, the following are arranged in sequence: the tensioning end anchor 502, the beam end anchor pad 402, the beam end cable guide 102, the beam end wire splitting plate 302, the tower end cable guide 101, the tower end wire splitting plate 301, the tower end anchor pad 401, and the fixed end anchor 501. Among them, the steel strand 2 runs through the entire device.

[0027] like Figure 1 As shown in the figure, the bridge back cable S is an important load-bearing component connecting the bridge tower and the bridge deck, among which the tower end T is the fixed end of the steel strand, and the beam end L is the tensioning end of the steel strand.

[0028] like Figure 2 As shown, from the beam end L to the tower end T, they are: the tensioning end anchor 502, the beam end anchor plate 402, the beam end cable guide 102, the beam end wire dividing plate 302, the steel strand 2, the tower end cable guide 101, the tower end wire dividing plate 301, the anchor plate 401, and the fixed end anchor 501, wherein the steel strand 2 runs through the entire device.

[0029] like Figure 2 and Figure 3As shown, each cable guide tube is forged with steel, such as 20MnMoNb steel ingot, and the length and wall thickness of the tube are determined according to the actual situation; in this embodiment, the length of the tower end cable guide tube 101 is 3.5m, and the wall thickness d is 32mm; the length of the beam end cable guide tube 102 is 3m, and the wall thickness d is 20mm; the outer diameter of the tube is 914mm. The cable guide tube is used for positioning the cable body and installing the wire splitter plate.

[0030] like Figure 2 and Figure 4 As shown, the steel strand 2 is a single-filament epoxy-coated prestressed steel strand 2 with a nominal diameter of φ15.2 mm. One end of the steel strand 2 passes through the tower end cable guide 101 and the other end passes through the beam end cable guide 102. The middle part is protected by an outer sheath tube 7 for corrosion protection. Cable hoops 6 are also used to fix the outer periphery of the steel strand 2 at both ends of the outer sheath tube 7. The outer sheath tube 7 is installed by a crane. After the installation is completed, the steel strand 2 is inserted. After all the steel strands 2 are installed, they are fixed by cable hoops 6.

[0031] like Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the wire splitter plate 301 at the tower end is a steel plate with a diameter of 826 mm and a thickness of 110 mm; the wire splitter plate 302 at the beam end is a steel plate with a diameter of 850 mm and a thickness of 110 mm; the wire splitter plate is welded and fixed in the cable guide tube, and a stopper 8 is welded and fixed at the junction of the two side surfaces of each wire splitter plate and the cable guide tube; when installing the steel strand 2, it is bundled from the tower end T to the beam end L. For ease of installation, the tower end wire splitter plate 301 is 150 mm away from the upper end of the tower end cable guide tube 101, and the beam end wire splitter plate 302 is 650 mm away from the upper end of the beam end cable guide tube 102. The wire splitter plate is a perforated steel plate welded inside the cable guide tube. Its purpose is to divide the steel strands into zones to prevent them from being disordered or entangled with each other. The port distance can be adjusted according to the number of steel strands and the tensioning conditions.

[0032] Each wire dividing plate is divided into seven area groups according to the number of bundled strands. Each area group has 85 small holes, and a total of 595 small holes are opened to meet the needs of perforating 595 steel strands.

[0033] like Figure 2 , Fig. 9 , Fig.10As shown, each anchor pad is two high-strength steel plates. The tower end anchor pad 401 is fixed inside the bridge tower, and the beam end anchor pad 402 is fixed at the bottom of the beam end L. Seven reserved holes are opened on each anchor pad according to the stranding of the steel strand 2. In this embodiment, the tower end anchor pad 401 has a structural dimension of 1500mm x 1500mm, a reserved hole diameter YD of 371mm, and an outer diameter MD of the anchor for anchoring the steel strand 2 is larger than the reserved hole diameter YD; the beam end anchor pad 402 has a structural dimension of 1950mmx1950mm, a reserved hole diameter YD of 430mm, and an outer diameter LD of the nut for fastening the steel strand 2 is larger than the reserved hole diameter YD. The hole is perpendicular to the anchor pad, the top and bottom surfaces of the anchor pad are parallel, and the top and bottom surfaces are perpendicular to the installation direction of the steel strand.

[0034] After the steel strand 2 is tensioned, it is clamped by anchors, and the fixed end anchor 501 is supported on the tower end anchor plate 401, and the tension end anchor 502 is supported on the beam end anchor plate 402.

[0035] The utility model has reasonable structure and is easy to manufacture and can finally combine the stranded steel strand back cables into a whole, so that the cables have the function of folding and bundling, thus solving the problem of bundling and tensioning 595 steel strands.

Claims

1. An ultra-large-size back cable cluster system, the back cables are used to connect the tower end of the supporting bridge tower and the end of the bridge deck beam, characterized by: The back cable is composed of strands of steel wire, the tower end is the fixed end of the back cable, and the beam end is the tensioning end of the back cable; from the beam end to the tower end, the steel wire strands that constitute the back cable pass through the following components in sequence: tensioning end anchor, beam end anchor pad, beam end cable guide, beam end wire dividing plate, tower end cable guide, tower end wire dividing plate, tower end anchor pad, and fixed end anchor.

2. The super-large-size back cable cluster system according to claim 1, characterized in that: The beam-end cable duct and the tower-end cable duct are both thick-walled steel cylinder structures made of forged steel; the beam-end wire splitter plate is welded and fixed to the steel cylinder outlet end of the beam-end cable duct near the beam end; the tower-end wire splitter plate is welded and fixed to the steel cylinder outlet end of the tower-end cable duct near the tower end.

3. The super-large-size back cable cluster system according to claim 2 is characterized in that: The two side surfaces of the beam end wire splitter plate and the tower end wire splitter plate are welded and fixed to the inner wall of the steel cylinder, and the junctions of the two side surfaces and the inner wall of the steel cylinder are welded and provided with blocks for reinforcement and fixing.

4. The super-large-size back cable cluster system according to claim 2, characterized in that: The beam end wire dividing plate and the tower end wire dividing plate are both symmetrically arranged with seven groups of regional perforation groups along the center of the plate surface, with one group in the center and six groups symmetrically arranged around the center group; each group is composed of several identical, adjacent holes equidistant and densely distributed independent through holes, and the steel strands constituting the back cable are combined into seven strands, and each steel strand constituting each strand passes through the seven groups of independent through holes in the beam end wire dividing plate section and the tower end wire dividing plate section respectively.

5. The super-large-size back cable cluster system according to any one of claims 1 to 4, characterized in that: The tower end anchor plate is fixed inside the tower end of the bridge tower, and the beam end anchor plate is fixed at the bottom of the beam end; seven groups of reserved holes are opened on the tower end anchor plate and the beam end anchor plate to accommodate the passage of each strand of steel wire.

6. The super-large-size back cable cluster system according to claim 5, characterized in that: The steel strand is a prestressed steel strand with a single filament coated with an epoxy coating. One end of the steel strand passes through the tower end cable guide tube and the other end passes through the beam end cable guide tube. An outer sheath tube is provided between the tower end cable guide tube and the beam end cable guide tube for anti-corrosion protection. Cable hoops are also used to fix the outer periphery of the steel strand at both ends of the outer sheath tube.

7. The super-large-size back cable cluster system according to claim 5, characterized in that: After the steel strand is tensioned, both ends are clamped and fixed by a tensioning end anchor and a fixed end anchor respectively. The fixed end anchor is supported on a tower end anchor pad, and the tensioning end anchor is supported on a beam end anchor pad.

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