Symmetrical and synchronous tensioning device for arch rib cantilever assembly buckle cable

Abstract

The utility model discloses an arch rib cantilever assembly buckle cable symmetrical and synchronous tensioning device which solves the problem that in the prior art, a cable-stayed buckling system method of a traditional single-span arch bridge is not suitable for the arch rib installation construction process of a multi-span multi-arch arch bridge. The device comprises a body, a working anchorage device, a triangular steel anchor beam and a longitudinal beam. The body comprises a working table, a working steel plate and a working table foot beam, arch rib buckle cables on the two sides are connected to the same tensioning traction device through a pulley block and a tool anchor, and four sets of buckle cables on the left side and the right side can be symmetrically and synchronously tensioned, so that stress balance of the left side and the right side of a buckle tower can be guaranteed, and the stability of the buckle tower is guaranteed; and the problem that the buckle tower deviates in the left-right direction in the buckle cable tensioning process is solved. The device not only improves the construction control of symmetrical and synchronous tensioning of the buckle cable and the precision of equal force values of the left cable and the right cable, but also reduces the construction risk of offset of the buckle tower, the device body can be moved and repeatedly used, the equipment cost is saved, and the device is simple and convenient to install and easy to operate and apply.

Description

Technical Field

[0001] The utility model belongs to the technical field of multi-span continuous arch bridge construction, in particular to an arch rib cantilever assembled cable symmetrical synchronous tensioning device. Background Art

[0002] Currently, the cable-stayed, buckle-and-hook system construction method is widely used in single-span arch bridges. During arch rib installation, two temporary buckle towers are often installed at the piers on the left and right banks of the bridge to assist in the installation. Cables are installed on the nearshore side of the buckle towers to connect them to anchors embedded in the rock or earth. During the installation process, the cable tension generated by the deadweight of the arch ribs on the far side of the buckle towers offsets the tension of the anchors on the nearshore side of the buckle towers, balancing the forces on both sides and thus controlling the left-right deviation of the buckle towers.

[0003] However, during the installation of the arch ribs of multi-span continuous arch bridges, the temporary pylons on the intermediate piers are located far from the riverbank, making it impossible to install rock or ground anchors. This results in the pylons being unable to offset the tension of the cables generated by the arch ribs' deadweight, preventing force balance. This can cause the pylons to shift, posing a construction risk. Therefore, directly adopting the cable-stayed, pylon-hung system used in traditional single-span arch bridges is not feasible. During the installation of the arch ribs of these multi-span continuous arch bridges, the force balance on both sides of the pylons must be considered; otherwise, it will be impossible to control the pylon shift, and thus, construction risks cannot be avoided.

[0004] Therefore, it is necessary to use new methods or devices to improve the construction method of the traditional single-span arch bridge's inclined-stayed buckle system. The utility model discloses a symmetrical and synchronous tensioning device for the buckle cables when the arch rib segments on both sides are simultaneously suspended during the inclined-stayed buckle construction of multi-span continuous arches, so as to solve the shortcomings of the arch rib installation construction technology of this type of multi-span continuous arch bridges. Utility Model Content

[0005] The purpose of this utility model is to provide a symmetrical and synchronous tensioning device for cantilevered arch rib assembly cables, thereby overcoming the drawback of the existing technology that the traditional single-span arch bridge cable-stayed cable-stayed system is not suitable for the arch rib installation and construction process of multi-span continuous arch bridges. The specific technical solution is as follows:

[0006] A symmetrical and synchronous tensioning device for an arch rib cantilever assembly cable comprises a longitudinal beam and a triangular steel anchor beam, wherein the triangular steel anchor beam is arranged on the longitudinal beam, and a working anchor is provided on the triangular steel anchor beam, a work platform is movably connected to the longitudinal beam, a jacking device and a working steel plate are provided on the work platform, the working steel plate and the work platform are connected by the jacking device, and the distance between the working steel plate and the work platform is achieved by the jacking device; anchoring parts for fixing the cable are symmetrically arranged on the working steel plate.

[0007] Preferably, the anchoring part includes a through hole and a temporary anchor. The through holes are symmetrically arranged on the working steel plate for the fastening cables to pass through. The temporary anchor is arranged on the top of the working steel plate for anchoring the fastening cables passing through the through holes.

[0008] Preferably, it further includes a pulley block which is arranged on the workbench for changing the direction of the fastening cable. There are several groups of pulley blocks, and several groups of pulleys are symmetrically arranged on the workbench.

[0009] Preferably, each pulley block contains at least two fixed pulleys.

[0010] Preferably, it further includes a workbench foot beam which is arranged at the bottom of the workbench. The workbench and the longitudinal beam are connected through the workbench foot beam.

[0011] Preferably, it further includes a triangular wedge. The triangular wedge is a right triangular prism with a right triangle on the top and bottom surfaces. The triangular wedge is arranged at the connection between the workbench foot beam and the longitudinal beam.

[0012] Preferably, the jacking device is a jack. The bottom of the jack is fixedly connected to the workbench, and the jacking part of the jack is fixedly connected to the bottom of the working steel plate.

[0013] Preferably, there are at least two jacks, and all the jacks arranged between the workbench and the working steel plate are jacked up and retracted synchronously.

[0014] Compared with the existing technology, the utility model has the following beneficial effects:

[0015] For the cable symmetric synchronous tensioning device during the construction of multi-span continuous arch cable-stayed suspension when the arch rib segments on both sides are suspended and assembled simultaneously, the fastening cables on both sides of the arch rib are connected to the same set of tensioning and traction devices through the pulley block and the tool anchor, which can realize the symmetric synchronous tensioning of a total of four groups of fastening cables on the left and right sides. Thus, it can ensure the balance of the forces on both sides of the cable tower, guarantee the stability of the cable tower, and avoid the problem of lateral displacement of the cable tower during the tensioning of the fastening cables. It not only improves the construction control of the symmetric synchronous tensioning of the fastening cables and the accuracy of equal left and right cable forces, but also reduces the construction risk of the cable tower deviation. The device body can be moved and reused repeatedly, saving equipment costs, and is simple to install and easy to operate and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0017] Figure 1 It is a structural schematic diagram of a symmetric synchronous tensioning device for the cable bracing of an arch bridge cantilever erection according to the present utility model.

[0018] Figure 2 It is an installation schematic diagram of a symmetric synchronous tensioning device for the cable bracing of an arch bridge cantilever erection according to the present utility model on the cable tower.

[0019] Main reference numerals description:

[0020] 1 - Temporary anchor, 2 - Pulley block, 3 - Workbench, 4 - Working anchor, 5 - Cable bracing, 6 - Longitudinal beam, 7 - Jack, 8 - Workbench foot beam, 9 - Triangular wedge block, 10 - Triangular steel anchor beam, 11 - Working steel plate, 12 - Cable tower, 13 - Longitudinal beam and triangular steel anchor beam, 14 - Arch rib, 15 - Bridge pier. Specific implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top part", "bottom part", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of the terms "first", "second", "third", etc., it is only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "linkage", and "setting" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The embodiments of the present utility model will be described below according to its overall structure.

[0025] Embodiment 1

[0026] This embodiment takes the Gao Shang Yellow River Special Bridge as the engineering background. Its main bridge is a through-type concrete-filled steel tube multi-span continuous arch tied-arch bridge with a span arrangement of 190m + 260m + 260m + 190m. The bridge has a total of 5 piers from the left bank to the right bank, and a temporary cable-stayed tower is respectively set on the three middle piers far from the river banks for the installation of the arch ribs. Among them, the main arch installation uses a cable-stayed and buckled hanging system for symmetric construction. First, the arch ribs and corresponding cross braces on both sides of the middle cable-stayed tower are synchronously installed in sequence, then 13 cable stays of the corresponding segments are symmetrically tensioned in sequence, and finally the main span is closed and the cross brace at the arch crown is installed. The present utility model is applicable to the symmetric cable-stayed and buckled hanging cantilever erection construction of the arch ribs of this type of multi-span continuous arch bridge. The layout of the symmetric cantilever erection cable-stayed and buckled hanging system for the arch ribs is as Figure 2 shown.

[0027] As Figure 1 shown, this embodiment provides a symmetric and synchronous tensioning device for the cable stays of the arch rib cantilever erection, including a main body, a working anchor 4, a triangular steel anchor beam 10, and a longitudinal beam 6.

[0028] The main body includes a workbench 3, a working steel plate 11, and a workbench foot beam 8. Two jacks 7 and a plurality of pulley blocks 2 are arranged on the workbench 3. The jacks 7 are used to tension the cable stays 5, and the pulley blocks 2 are used to change the direction of the cable stays 5. Four temporary anchors 1 are welded on the working steel plate 11 for temporarily anchoring the cable stays 5. The working steel plate 11 is arranged above the jacks 7. The workbench foot beam 8 is used to temporarily fix the main body of the device;

[0029] The working anchor 4 is welded on the triangular steel anchor beam 10 for anchoring the cable stays 5; the triangular steel anchor beam 10 is fixedly welded on the longitudinal beam 6 using triangular wedges for fixing the working anchor 4; the longitudinal beam 6 is the longitudinal beam 6 in the cable-stayed tower structure, and the workbench foot beam 8 of the device main body is connected to the longitudinal beam 6 using bolt-connected triangular wedges.

[0030] The structure of the main body can be installed, disassembled, moved, and reused repeatedly.

[0031] The structure of the main body can symmetrically and synchronously tension four groups of cable stays 5.

[0032] On the end face of the workbench 3 of the main body, there are two jacks 7 and multiple pulley groups 2. The pulley groups 2 change the direction of the cable 5, and the jacks 7 are arranged below the working steel plate 11.

[0033] Four temporary anchors 1 are welded to the working steel plate 11 of the main body. The temporary anchors 1 and the cable 5 are temporarily anchored. The working steel plate 11 is arranged above the jack 7. When the jack 7 works, the working steel plate 11 is lifted upwards to tension the cable 5.

[0034] The working anchor 4 is a non-loosening low-stress wedge-shaped anchor. After the cable 5 is tensioned, the working anchor 4 automatically anchors the cable 5 on the triangular steel anchor beam 10, thereby anchoring the cable 5 on the cable tower.

[0035] The temporary anchors 1 on the working steel plate 11 can be reused. After the cable 5 of the previous segment is tensioned, the temporary anchors 1 can be loosened and the cable 5 can be detached from the working steel plate 11. Then, the device main body is removed and moved to the corresponding cable tower longitudinal beam 6 of the next segment to perform the tensioning of the cable 5 of the next segment.

[0036] During use, the device main body is installed on the corresponding cable tower longitudinal beam 6 by bolt connection. A total of four groups of cables 5 on the left and right sides pass through the working anchor 4, then through the pulley groups 2, and are then anchored on the temporary anchors 1 of the working steel plate 11. Then, the two jacks 7 are pressurized simultaneously to lift the working steel plate 11. Among them, the stroke of the jack 7 is equal to the elongation value of the cable 5 tensioning calculated according to the cable force, so as to achieve the effect of simultaneously tensioning a total of four groups of cables 5 on the left and right sides, which can ensure the stability of the cable tower and avoid the left-right deviation of the cable tower during the tensioning of the cable 5. After the cable 5 of the previous segment is tensioned, the working anchor 4 automatically anchors the cable 5, then the temporary anchor 1 is loosened to detach the cable 5 from the working steel plate 11, and then the device main body is removed and moved to the corresponding cable tower longitudinal beam 6 of the next segment to perform the tensioning of the cable 5 of the next segment.

[0037] Next, the working principle and working process in this embodiment will be further described in detail so that those skilled in the art can better understand the present utility model:

[0038] As Figure 1 shown, a device for symmetric synchronous tensioning of cables 5 in the cantilever erection of an arch bridge includes a main body, a working anchor 4, a triangular steel anchor beam 10, and a longitudinal beam 6. As Figure 2 shown, an installation schematic diagram of a device for symmetric synchronous tensioning of cables 5 in the cantilever erection of an arch bridge on a cable tower. The workbench foot beam 8 of the device main body is connected to the longitudinal beam 6 through a triangular wedge 9. The connection method uses bolt connection, so as to facilitate the installation and disassembly of the workbench 3. The device main body can be moved and used multiple times.

[0039] There are a total of four groups of fastening cables 5 on the left and right sides of the device. The fastening cable 5 first passes through the working anchor 4, and then the direction of the fastening cable 5 is changed through the pulley block 2, so as to facilitate the control of the elongation of the fastening cable 5 during tensioning. Then, the fastening cable 5 is temporarily anchored on the temporary anchor 1 of the working steel plate 11.

[0040] The two jacks 7 start to operate simultaneously, and pressurize to lift the working steel plate 11 upward for tensioning the fastening cable 5. The lift of the jack is equal to the elongation value of the fastening cable 5 calculated according to the cable force. A total of four groups of fastening cables 5 on the left and right sides are tensioned simultaneously, which can ensure the stability of the buckling tower 12 and avoid the lateral offset of the buckling tower during the tensioning of the fastening cable 5.

[0041] After the tensioning of the fastening cable 5 is completed, the working anchor 4 automatically anchors the fastening cable 5, then relaxes the temporary anchor 1, disengages the fastening cable 5 from the working steel plate 11, and then removes the bolts of the working bench foot beam 8 of the device body and moves the device body to the corresponding buckling tower longitudinal beam 13 of the next section for tensioning the fastening cable 5 of the next section.

[0042] In summary, the fastening cable symmetric synchronous tensioning device during the simultaneous hanging and splicing of the arch rib segments on both sides during the construction of the multi-span continuous arch cable-stayed buckling hanging of the present utility model connects the fastening cables on both sides of the arch rib to the same set of tensioning and traction devices through the pulley block and the tool anchor, and can realize the symmetric synchronous tensioning of a total of four groups of fastening cables on the left and right sides, thereby ensuring the balance of the forces on both sides of the buckling tower, ensuring the stability of the buckling tower, and avoiding the problem of lateral offset of the buckling tower during the tensioning of the fastening cable. It not only improves the construction control of the symmetric synchronous tensioning of the fastening cable and the accuracy of the equal left and right cable forces, but also reduces the construction risk of the buckling tower deviation. The device body can be moved and reused repeatedly, saving equipment costs, being easy to install and easy to operate and apply.

[0043] The foregoing description of the specific exemplary embodiments of the present utility model is for the purpose of illustration and exemplification. These descriptions are not intended to limit the present utility model to the precise forms disclosed, and obviously, many changes and variations can be made in accordance with the above teachings. Although the embodiments of the present utility model have been shown and described, the specific embodiments are merely interpretations of the present utility model and not limitations thereof. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present utility model and its practical applications, so that those skilled in the art can, after reading this specification, make modifications, substitutions, variations, and various different selections and changes that do not contribute creatively to the embodiments without departing from the principles and purposes of the present utility model, but are protected by the patent law as long as they are within the scope of the claims of the present utility model.

Claims

1. A symmetric synchronous tensioning device for stay cables in cantilever erection of arch ribs, comprising a longitudinal beam (6) and a triangular steel anchor beam (10), the triangular steel anchor beam (10) is arranged on the longitudinal beam (6), and a working anchor (4) is arranged on the triangular steel anchor beam (10), characterized in that, A workbench (3) is movably connected to the longitudinal beam (6), and a jacking device and a working steel plate (11) are provided on the workbench (3). The working steel plate (11) and the workbench (3) are connected by the jacking device, and the distance between the working steel plate (11) and the workbench (3) is achieved by the jacking device. Anchoring parts for fixing the buckle rope (5) are symmetrically provided on the working steel plate (11).

2. The symmetric synchronous tensioning device for the cable stayed cables of the arch rib cantilever erection according to claim 1, characterized in that, The anchoring portion includes a through hole and a temporary anchor (1), wherein the through hole is symmetrically arranged on the working steel plate (11) for the buckle cable (5) to pass through, and the temporary anchor (1) is arranged on the top of the working steel plate (11) for anchoring the buckle cable (5) passing through the through hole.

3. The symmetric and synchronous tensioning device for the cable stays of the arch rib cantilever erection according to claim 1, wherein, It also includes a pulley group (2) which is arranged on the workbench (3) and is used to change the direction of the buckle rope (5). The pulley group (2) has several groups, and the several groups of pulleys are symmetrically arranged on the workbench (3).

4. A symmetrical synchronous tensioning device for stay cables of arch rib cantilever erection according to claim 3, characterized in that, Each pulley assembly (2) contains at least two fixed pulleys.

5. A symmetric synchronous tensioning device for stay cables in the cantilever erection of arch ribs according to claim 1, characterized in that, It also includes a workbench foot beam (8), which is arranged at the bottom of the workbench (3), and the workbench (3) and the longitudinal beam (6) are connected via the workbench foot beam (8).

6. A symmetric synchronous tensioning device for stay cables in cantilever erection of arch ribs according to claim 5, characterized in that, It also includes a triangular wedge (9), which is a right triangular prism with a top surface and a bottom surface in the form of a right triangle. The triangular wedge (9) is arranged at the connection between the workbench foot beam (8) and the longitudinal beam (6).

7. A symmetric and synchronous tensioning device for stay cables in the cantilever erection of arch ribs according to claim 1, characterized in that, The lifting device is a jack (7), the bottom of the jack (7) is fixedly connected to the workbench (3), and the lifting part of the jack (7) is fixedly connected to the bottom of the working steel plate (11).

8. The symmetric and synchronous tensioning device for the cable stays of the arch rib cantilever erection according to claim 7, characterized in that, At least two jacks (7) are provided, and all jacks (7) arranged between the workbench (3) and the working steel plate (11) are synchronously lifted and retracted.

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