Arch rib lateral rotation tension erection device and construction method

Abstract

The present invention provides an arch rib lateral rotation tensioning and erecting device, comprising tensioning cables, continuous tensioning jacks, and a pedestal for installing the arch rib, wherein two arch ribs are arranged along the length of the bridge, and the two arch ribs are symmetrically arranged on the left and right sides of the bridge axis, the pedestal is located at the end of the arch rib, and the end of the arch rib is connected to the pedestal via a temporary rotating hinge, and the arch rib is in a side-lying state before the tensioning and erecting, and the side-lying state means that the arch rib is swung outward and the angle between it and the horizontal plane is 0-10 degrees, and a plurality of continuous tensioning jacks are installed on the arch rib along its axial interval, and the continuous tensioning jacks on the two arch ribs are arranged one by one, and the two continuous tensioning jacks correspondingly arranged on the two arch ribs are connected via the tensioning cables. The device has a simple structure and a reasonable design, is suitable for the construction of arch bridges of various spans, and is convenient to construct. For large-span arch bridges, there is no need to set up a higher temporary construction tower, and the project cost is low, with good practical value and economic benefits.

Description

Technical Field

[0001] The invention relates to an arch rib lateral rotation tensioning and erecting device and a construction method. Background Art

[0002] With the increasing development of national infrastructure construction, the span of arch bridges has gradually increased, and the construction of arch ribs is the first technical problem to be solved. At present, there are two common methods for the construction of arch ribs: the scaffolding method and the non-scaffolding method. The scaffolding method is often used for masonry arch bridges, but it usually requires a large number of arch frames as temporary supports. The removal process of the arch frames is complicated, the construction cost is high, and it is difficult to apply to complex terrains such as deep valleys; the non-scaffolding method is divided into the rotation construction method and the cantilever construction method. Among them, the rotation construction method is the most widely used in the horizontal rotation method, but when the span of the arch bridge increases, the arch rib is too long and the rotation is difficult to control; the cantilever construction method is to cantilever two half arches from the arch foot to the arch top, and finally close them at the arch top. However, during the cantilever construction process, large cranes are often used for segmented lifting and assembly at high altitudes. Not only is the construction period long, but it also requires a lot of high-altitude operations, which poses a great safety risk.

[0003] At present, the cable-stayed cantilever method is the most widely used for long-span arch bridges. This method first sets up temporary construction towers on both sides of the bridge, and the main arch ribs are cantilevered from the arch foot to the arch top in stages, and the cantilevered arch ribs are pulled on the temporary construction towers with inclined cables. However, the height of the temporary construction towers is often much higher than the height of the arch ribs, and a large number of cable cranes are required, resulting in high construction costs. It is not as economical as cable-stayed bridges, which limits the development of arch bridges. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an arch rib lateral rotation tensioning and erecting device and a construction method.

[0005] The present invention is implemented by the following scheme: an arch rib lateral rotation tension erection device, including tension cables, continuous tensioning jacks, and a pedestal for installing the arch ribs. Two arch ribs are arranged along the length of the bridge, and the two arch ribs are symmetrically arranged on the left and right sides of the bridge axis. The pedestal is located at the end of the arch rib, and the end of the arch rib is connected to the pedestal via a temporary rotating hinge. Before the tension erection, the arch rib is in a side-lying state, and the side-lying state means that the arch rib is swung outward and the angle between it and the horizontal plane is 0-10 degrees. A plurality of continuous tensioning jacks are installed on the arch rib along its axial direction at intervals. The continuous tensioning jacks on the two arch ribs are arranged one by one, and the two continuous tensioning jacks correspondingly arranged on the two arch ribs are connected via the tension cables.

[0006] Furthermore, it also includes a transverse support rod. When the arch rib is in a side-lying state, it rotates laterally from the outer side to the inner side until the two arch rib planes are parallel and are located in a reinforcement position. The reinforcement position refers to the arch rib swinging outward and the angle between the arch rib and the vertical plane is 0-5 degrees. When the arch rib is in the reinforcement position, a number of transverse support rods arranged along the axial direction are connected between the two arch ribs, and a hydraulic cylinder parallel to the end of the transverse support rod is installed, and the piston rod end of the hydraulic cylinder is hinged to the arch rib on the same side.

[0007] Furthermore, a plurality of temporary piers are provided at intervals on the lower side of the arch rib along the length direction of the bridge. When the arch rib is in a side-lying state, the arch rib is erected on the temporary piers.

[0008] Furthermore, a temporary tower is arranged below the middle of the pull cable, and a saddle for erecting the pull cable is installed on the top surface of the temporary tower.

[0009] A construction method for lateral rotation and tensioning of an arch rib comprises the following steps:

[0010] Step 1: erect a number of temporary towers and temporary piers within the designed span of the arch rib;

[0011] Step 2: Build the arch rib on the temporary pier, and install a temporary rotating hinge at the connection between the pedestal and the arch rib;

[0012] Step 3: Install a number of continuous tensioning jacks at intervals along the axial direction of the arch rib, and connect two corresponding continuous tensioning jacks on two arch ribs via tension cables;

[0013] Step 4: The pull cables are tensioned synchronously by continuous tensioning jacks, so that the arch rib is rotated from the outside to the inside from the side-lying state to the reinforcement position, and then a transverse support rod is arranged between the two arch ribs, and the piston rod end of the hydraulic cylinder at the end of the transverse support rod is hinged to the arch rib on the same side;

[0014] Step 5: Continue to tension the cables synchronously through the continuous tensioning jacks, and at the same time, perform axial contraction through the hydraulic cylinder to control the lateral rotation angle of the arch rib until the arch rib reaches the designed parallel or inward-inclined position;

[0015] Step 6: Remove the cables connected to the arch ribs, remove the temporary towers and temporary piers, and completely consolidate the temporary rotating hinges so that the arch ribs and the pedestal form a whole, completing the construction of the arch rib tension lateral rotation frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects: simple structure, reasonable design, applicable to the construction of arch bridges of various spans, convenient construction, no need to set up higher temporary construction towers for large-span arch bridges, low project cost, and good practical value and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the arch rib in the side-lying position.

[0018] Figure 2 Schematic diagram of the supporting structure of the arch rib in side-lying position.

[0019] Figure 3 Schematic diagram of the connection structure between the arch rib and the tension cable.

[0020] Figure 4 It is a schematic diagram of the connection structure between the tension cable and the temporary tower when the height of the temporary tower is lower than the design elevation of the arch rib.

[0021] Figure 5 This is a schematic diagram of the connection structure of the tension cable when no temporary tower is set up.

[0022] Figure 6 It is a schematic diagram of the connection structure between the tension cable and the temporary tower when the height of the temporary tower is higher than the design elevation of the arch rib.

[0023] Figure 7 It is a schematic diagram of the connection structure between the tension cable and the continuous jack.

[0024] Figure 8 It is a schematic diagram of the structure of the transverse support rod.

[0025] In the figure: 1-arch rib; 2-pull cable; 3-temporary rotating hinge; 4-continuous jack; 5-pedestal; 6-temporary pier; 7-temporary tower; 8-fixed pulley; 9-lateral support rod; 10-hydraulic cylinder; 11-piston rod; 12-hinged joint between piston rod and arch rib. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] like Figure 1-8As shown, an arch rib lateral rotation tensioning and erection device includes tensioning cables 2, continuous tensioning jacks 4, and a pedestal 5 for installing the arch rib 1. Two arch ribs are arranged along the length of the bridge, and the two arch ribs are symmetrically arranged on the left and right sides of the bridge axis. The pedestal is located at the end of the arch rib, and the end of the arch rib is connected to the pedestal via a temporary rotating hinge 3. Before the tensioning and erection, the arch rib is in a side-lying state, and the side-lying state means that the arch rib is swung outward and the angle between it and the horizontal plane is 0-10 degrees. A plurality of continuous tensioning jacks are installed on the arch rib along its axial direction at intervals, and the continuous tensioning jacks on the two arch ribs are arranged one by one, and the two continuous tensioning jacks correspondingly arranged on the two arch ribs are connected via the tensioning cables.

[0030] In this embodiment, the continuous tensioning jack is installed on the outer side or inside of the arch rib, and a fixed pulley 8 is installed on the inner side of the arch rib for the tension cable to pass around. The upper rim of the fixed pulley is always located at the center axis of the continuous tensioning jack, so that the tension cable is perpendicular to the end plane of the continuous tensioning jack.

[0031] In this embodiment, a transverse support rod 9 is also included. The arch rib is in a side-lying state and is laterally rotated from the outside to the inside until the two arch rib planes are parallel to each other and is located in a reinforcement position. The reinforcement position refers to the arch rib swinging outward and the angle between the arch rib and the vertical plane is 0-5 degrees. When the arch rib is in the reinforcement position, a number of transverse support rods arranged along the axial direction are connected between the two arch ribs, and a hydraulic cylinder 10 parallel to the transverse support rod is installed at the end of the transverse support rod, and the end of the piston rod 11 of the hydraulic cylinder is hinged to the arch rib on the same side.

[0032] In this embodiment, a plurality of temporary piers 6 are provided at intervals on the lower side of the arch rib along the length direction of the bridge. When the arch rib is in a side-lying state, the arch rib is erected on the temporary piers.

[0033] In this embodiment, a temporary tower 7 is arranged below the middle of the tension cable, and a saddle for the tension cable is installed on the top surface of the temporary tower. The tension cable passes through the saddle, so that the cable has a larger vertical lifting component when the tension cable is pulled.

[0034] In this embodiment, the height of the temporary tower is lower than the design elevation of the arch rib and higher than the height of the arch rib in the side-lying state. When the arch rib is raised from the side-lying state by side rotation to be parallel to the height of the temporary tower, the tension cable is separated from the temporary tower. In the process of the arch rib being raised from the side-lying state by side rotation to the design position of the bridge-finished state, the temporary tower plays the role of supporting the tension cable only when the arch rib side rotation lifting height is not higher than the tower height; or, in the process of the arch rib being raised from the side-lying state by side rotation to the design position of the bridge-finished state, the temporary tower may not be arranged below the middle part of the tension cable; or, the height of the temporary tower is higher than the design elevation of the arch rib. In the process of the arch rib being raised from the side-lying state by side rotation to the design position of the bridge-finished state, the tension cable is always supported by the temporary tower.

[0035] A construction method for lateral rotation and tensioning of an arch rib comprises the following steps:

[0036] Step 1: erect a number of temporary towers and temporary piers within the designed span of the arch rib;

[0037] Step 2: Build the arch rib on the temporary pier, and install a temporary rotating hinge at the connection between the pedestal and the arch rib;

[0038] Step 3: Install a number of continuous tensioning jacks at intervals along the axial direction of the arch rib, and connect two corresponding continuous tensioning jacks on two arch ribs via tension cables;

[0039] Step 4: The pull cables are tensioned synchronously by continuous tensioning jacks, so that the arch rib is rotated from the outside to the inside from the side-lying state to the reinforcement position, and then a transverse support rod is arranged between the two arch ribs, and the piston rod end of the hydraulic cylinder at the end of the transverse support rod is hinged to the arch rib on the same side;

[0040] Step 5: Continue to tension the cables synchronously through the continuous tensioning jacks, and at the same time, perform axial contraction through the hydraulic cylinder to control the lateral rotation angle of the arch rib until the arch rib reaches the designed parallel or inward-inclined position;

[0041] Step 6: Remove the cables connected to the arch ribs, remove the temporary towers and temporary piers, and completely consolidate the temporary rotating hinges so that the arch ribs and the pedestal form a whole, completing the construction of the arch rib tension lateral rotation frame.

[0042] In this embodiment, the transverse support rod can be used as a permanent transverse support or as a temporary transverse support; if used as a temporary transverse support, it is removed after the permanent transverse support is installed when the arch rib reaches the designed position.

[0043] If this patent discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as connection using bolts or screws), or as: a non-detachable fixed connection (such as riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (such as one-piece manufacturing using a casting process) (except where it is obviously impossible to use an integrated molding process).

[0044] In the description of this patent, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0045] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. An arch rib lateral rotation tension erection device, characterized in that: It includes tension cables, continuous tensioning jacks, and a pedestal for installing arch ribs. Two arch ribs are arranged along the length of the bridge. The two arch ribs are symmetrically arranged on the left and right sides of the bridge axis. The pedestal is located at the end of the arch rib, and the end of the arch rib is connected to the pedestal via a temporary rotating hinge. Before the tensioning installation, the arch rib is in a side-lying state, and the side-lying state means that the arch rib is swung outward and the angle between it and the horizontal plane is 0-10 degrees. A number of continuous tensioning jacks are installed on the arch rib along its axial intervals. The continuous tensioning jacks on the two arch ribs are arranged one by one, and the two continuous tensioning jacks correspondingly arranged on the two arch ribs are connected via the tension cables; the continuous tensioning jacks are installed on the outer side or inside of the arch rib, and a fixed pulley for the tension cables to bypass is installed on the inner side of the arch rib.

2. The arch rib lateral rotation tension erection device according to claim 1, characterized in that: It also includes a transverse support rod. When the arch rib is in a side-lying state, it rotates laterally from the outside to the inside until the two arch rib planes are parallel and is located in a reinforcement position. The reinforcement position refers to the arch rib swinging outward and the angle between it and the vertical plane is 0-5 degrees. When the arch rib is in the reinforcement position, a number of transverse support rods arranged along the axial direction are connected between the two arch ribs, and a hydraulic cylinder parallel to the end of the transverse support rod is installed, and the piston rod end of the hydraulic cylinder is hinged to the arch rib on the same side.

3. The arch rib lateral rotation tension erection device according to claim 2, characterized in that: A plurality of temporary piers are arranged at intervals on the lower side of the arch rib along the length direction of the bridge. When the arch rib is in a side-lying state, the arch rib is erected on the temporary piers.

4. The arch rib lateral rotation tension erection device according to claim 3, characterized in that: A temporary tower is arranged below the middle of the pull cable, and a saddle for erecting the pull cable is installed on the top surface of the temporary tower.

5. A construction method for arch rib lateral rotation and tensioning erection, using the arch rib lateral rotation and tensioning erection device as claimed in claim 4, characterized in that: The following steps are involved: Step 1: erect a number of temporary towers and temporary piers within the designed span of the arch rib; Step 2: Build the arch rib on the temporary pier, and install a temporary rotating hinge at the connection between the pedestal and the arch rib; Step 3: Install a number of continuous tensioning jacks at intervals along the axial direction of the arch rib, and connect two corresponding continuous tensioning jacks on two arch ribs via tension cables; Step 4: The pull cables are tensioned synchronously by continuous tensioning jacks, so that the arch rib is rotated from the outside to the inside from the side-lying state to the reinforcement position, and then a transverse support rod is arranged between the two arch ribs, and the piston rod end of the hydraulic cylinder at the end of the transverse support rod is hinged to the arch rib on the same side; Step 5: Continue to tension the cables synchronously through the continuous tensioning jacks, and at the same time, perform axial contraction through the hydraulic cylinder to control the lateral rotation angle of the arch rib until the arch rib reaches the designed parallel or inward-inclined position; Step 6: Remove the cables connected to the arch ribs, remove the temporary towers and temporary piers, and completely consolidate the temporary rotating hinges so that the arch ribs and the pedestal form a whole, completing the construction of the arch rib tension lateral rotation frame.

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