Temporary anchoring structure in longitudinal direction of bridge and its installation method

Abstract

The present application provides a temporary anchoring structure in the longitudinal direction of a bridge and an installation method thereof, wherein the temporary anchoring structure in the longitudinal direction of the bridge comprises an anchoring seat, an anchoring steel pipe and a connecting ear plate, wherein two anchoring seats are provided and are respectively anchored on the cable tower along the longitudinal direction of the bridge and the cantilever steel box girder to be connected, wherein connecting ear plates are provided at both ends of the anchoring steel pipe, and the two ends of the anchoring steel pipe are respectively pinned and fixed to the anchoring seat anchored on the surface of the bridge structure through the connecting ear plates, wherein the connecting ear plate at one end of the anchoring steel pipe is fixed to the anchoring seat, and the connecting ear plate at the other end of the anchoring steel pipe is adjustable in position along the longitudinal direction of the bridge. The connecting ear plates at both ends of the anchoring steel pipe are pinned to the anchoring seat, thereby temporarily consolidating the cable tower and the cantilever steel box girder under construction, thereby limiting the position of the cantilever steel box girder under construction, and resisting the unbalanced bending moment and the longitudinal and transverse horizontal forces in the cantilever construction process, and no on-site hole expansion is required, thereby facilitating construction.

Description

Technical Field

[0001] The present application relates to the field of bridge construction, and in particular to a temporary anchoring structure in the longitudinal direction of a bridge and an installation method thereof. Background Art

[0002] During the cantilever construction of the main beam of a cable-stayed bridge, the main beam needs to be temporarily consolidated at the tower column to resist the unbalanced bending moment and the longitudinal and transverse horizontal forces during the construction process.

[0003] There are already some temporary anchorage structures in the longitudinal direction of the bridge: Plan 1: Use steel pads between the vertical supports and shear supports of the bridge to limit the longitudinal displacement of the bridge during the cantilever construction; Plan 2: Use flexible cable structures, such as the Sutong Bridge; Plan 3: Use steel pipes as tension and compression structures, such as the Shanghai Yangtze River Bridge.

[0004] Among them, for the fully floating cable-stayed bridge without a single-column tower, there are no vertical supports and shear supports at the tower column, so method 1 cannot be used. In method 2, the cable structure is relatively flexible and relies on the temporary anchor structure to provide pure tension to provide position limiting, so the tension is large and the local tensile force requirements of the bridge tower column structure are high.

[0005] Method 3 is to tension the prestressed steel bars between the hinged seats of the two towers along the bridge, converting the tension on one side into pressure on the opposite side, which is inconvenient to construct. In addition, the hinged structures at both ends have high requirements for on-site installation accuracy. The specification requires that the pin shaft be 1mm smaller than the pin hole diameter. For large-diameter pin shafts, the pin shaft is usually 0.5mm smaller than the ear plate diameter. Therefore, the processing accuracy of the steel box girder installation and temporary anchoring structure is required to be within the error range of 1mm, which is very difficult to achieve. Additional measures are usually required on site, such as expanding the pin hole, which increases the difficulty of on-site operation, and the expansion will cause safety hazards to the structural stress. Summary of the invention

[0006] The main purpose of this application is to provide a temporary anchoring structure in the longitudinal direction of the bridge that can ensure stress and facilitate on-site construction.

[0007] Another object of the present application is to provide a method for installing the temporary anchoring structure in the longitudinal direction of the above-mentioned bridge.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] As a first aspect, the present application relates to a temporary anchoring structure in the longitudinal direction of a bridge, comprising an anchor seat, an anchoring steel pipe and a connecting ear plate, wherein two anchor seats are arranged and are respectively anchored on a cable tower along the longitudinal direction of the bridge and a cantilever steel box girder to be connected, both ends of the anchoring steel pipe are provided with the connecting ear plates, and both ends of the anchoring steel pipe are respectively pinned and fixed to an anchor seat anchored on the surface of the bridge structure through the connecting ear plates, the connecting ear plate at one end of the anchoring steel pipe is fixed thereto, and the connecting ear plate at the other end thereof is adjustable in the position of the anchoring steel pipe along the longitudinal direction of the bridge.

[0010] It is further configured that: a groove extending along the longitudinal bridge direction is provided at the end of the anchoring steel pipe, and the connecting ear plate is inserted into the groove and connected to the anchoring steel pipe.

[0011] It is further configured that a stiffening plate is provided at the end of the anchoring steel pipe, a slot for inserting the stiffening plate is provided at the end of the anchoring steel pipe, and the stiffening plate passes through the slot and is connected to the connecting ear plate.

[0012] It is further arranged that the anchor seat installed on the cable tower includes a first connecting support plate and an embedded part embedded in the cable tower, and the connecting support plate and the embedded part embedded in the cable tower are locked and fixed by anchor rods and nuts.

[0013] It is further arranged that the embedded part comprises an embedded sleeve embedded in the cable tower, the anchor rod passes through the embedded sleeve, one end of the anchor rod is anchored in the cable tower, and the other end is locked and fixed to the connecting support plate through a nut.

[0014] Further arrangement: the anchor seat installed on the cantilever steel box girder to be connected includes a second connection support plate and an internal connection seat, the internal connection seat is welded on the inner wall of the cantilever steel box girder, and the second connection support plate and the internal connection seat are fixed by bolts passing through the side wall of the cantilever steel box girder.

[0015] It is further arranged that the connecting ear plates at both ends of the anchoring steel pipe and the anchoring seats on the cable tower and the cantilever steel box girder to be connected are provided with pin holes of the same size.

[0016] As a second aspect, the present application relates to a method for installing a temporary anchoring structure in the longitudinal direction of the bridge as described above, comprising the following steps:

[0017] Transport the processed temporary anchoring structure to the construction site;

[0018] Anchor embedded parts of temporary anchoring structures are arranged on the side walls of the cable towers and cantilever steel box girders to be connected along the longitudinal direction of the bridge, and connecting bearing plates are installed;

[0019] The two ends of the temporary anchoring structure are pinned and fixed to the connecting bearing plates on the cable tower and the cantilever steel box girder respectively, so as to complete the temporary anchoring of the cable tower and the cantilever steel box girder along the longitudinal direction of the bridge.

[0020] Further configuration: when processing the temporary anchoring structure, the anchoring steel pipe of the temporary anchoring structure is welded and fixed to the connecting ear plate at one end thereof, and the connecting ear plate at the other end thereof is movably connected to the anchoring steel pipe, and the connecting ear plate at this end is adjustable in the position of the anchoring steel pipe along the longitudinal bridge direction.

[0021] Further, the pinning and fixing of the two ends of the temporary anchoring structure to the connecting support plates on the cable tower and the cantilever steel box beam respectively comprises the following steps:

[0022] Pin one end of the anchor steel pipe welded to the connecting ear plate to the connecting support plate at the cable tower;

[0023] Adjust the position of the connecting ear plate at the other end of the anchor steel pipe so that the connecting ear plate is pin-connected with the connecting support plate on the cantilever steel box girder to be connected;

[0024] The unwelded end of the anchor steel pipe is welded and fixed to the connecting ear plate after the position is adjusted.

[0025] Compared with the prior art, the solution of this application has the following advantages:

[0026] 1. In the temporary anchoring structure in the longitudinal direction of the bridge of the present application, the connecting ear plates at both ends of the anchoring steel pipe are pinned to the anchoring seat, so as to temporarily consolidate the cable tower and the construction cantilever steel box girder, which can limit the construction cantilever steel box girder and resist the unbalanced bending moment and longitudinal and transverse horizontal forces in the cantilever construction process.

[0027] 2. In the temporary anchorage structure in the longitudinal direction of the bridge of the present application, a tension-compression structure with pins connected at both ends of the anchoring steel pipe is adopted, which is convenient for construction, and a pre-buried steel pipe is arranged in the cable tower as an anchor seat at the tension end, which can meet the force requirements of the temporary anchorage structure in the longitudinal direction of the bridge. There is no need to set up prestressed steel bars separately, which facilitates on-site construction.

[0028] 3. In the temporary anchoring structure of the longitudinal direction of the bridge in this application, the two ends of the anchor steel pipe are pinned to the anchor seat through the connecting ear plate. At the same time, the first connection support plate and the second connection support plate of the anchor seat are detachably connected to the cable tower and the corresponding cantilever steel box girder, and there is no need to expand the pin hole to reduce the accuracy requirements of on-site installation. After the cantilever construction is completed, the anchor steel pipe, the first connection support plate, and the second connection support plate can be used in a turnover manner to reduce the construction cost. The embedded steel pipe retained inside the cable tower also serves as a structural reinforcement inside the cable tower to improve the structural strength of the cable tower.

[0029] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0031] Figure 1 A schematic diagram of an embodiment of a temporary anchoring structure in the longitudinal direction of the bridge of the present application;

[0032] Figure 2 This is a schematic diagram of the docking of the anchor seat and the connecting ear plate in the temporary anchor structure in the longitudinal direction of the bridge in this application.

[0033] In the figure, 1. anchor seat; 11. first connecting support plate; 12. embedded steel pipe; 13. second connecting support plate; 14. internal connecting seat; 2. anchoring steel pipe; 3. connecting ear plate; 4. stiffening plate. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0035] See also Figure 1 and Figure 2 In view of the current situation that the main beam at the tower column needs to be temporarily consolidated during the construction of the cantilever of the main beam of the cable-stayed bridge, the present application provides a temporary anchoring structure in the longitudinal direction of the bridge, the two ends of which are connected to the building structure along the longitudinal direction of the bridge, which can facilitate on-site construction operations while ensuring the force.

[0036] It should be noted that the temporary anchoring structure in the longitudinal direction of the bridge of the present application is connected between the cable tower and the cantilever steel box along the longitudinal direction of the bridge for temporary fixation, wherein the end of the temporary anchoring structure in the longitudinal direction of the bridge connected to the cable tower serves as the tension end to resist the unbalanced bending moment and longitudinal horizontal force during the cantilever construction process.

[0037] The temporary anchoring structure in the longitudinal direction of the bridge includes an anchoring seat 1, an anchoring steel pipe 2 and a connecting ear plate 3. Two groups of the anchoring seats 1 are arranged corresponding to the two ends of the anchoring steel pipe 2. The two groups of the anchoring seats 1 are respectively arranged on the side walls of the cable tower along the longitudinal direction of the bridge and the side walls of the cantilever steel box girder to be connected. The connecting ear plate 3 is respectively arranged at both ends of the anchoring steel pipe 2, so that the two ends of the anchoring steel pipe 2 are pin-connected and fixed to the cable tower and the cantilever steel box girder to be connected through the connecting ear plates 3.

[0038] One end of the anchor steel pipe 2 is welded and fixed to the connecting ear plate 3 corresponding to the end, and the connecting ear plate 3 at the other end is adjustable in the position of the anchor steel pipe 2 along the longitudinal direction of the bridge, so that the overall length of the temporary anchor structure in the longitudinal direction of the bridge of the present application can be adjusted by adjusting the length of the connecting ear plate 3 on the unwelded side of the anchor steel pipe 2 and the insertion length of the anchor steel pipe 2, so as to adapt to the connection between bridge structures at different distances, and the installation applicability is high. When the length of the temporary anchor structure in the longitudinal direction of the bridge meets the spacing between the cable tower and the cantilever steel beam to be connected, the anchor steel pipe 2 on the side of the anchor steel pipe 2 that is not welded to the connecting ear plate 3 can be connected to the connecting ear plate 3 to ensure the stability of the temporary anchor structure and its tensile strength for the cable tower and cantilever steel box beam connected at both ends.

[0039] The anchoring steel pipe 2 of this embodiment is provided with a slot extending along its length direction at both ends thereof, and the connecting ear plate 3 is inserted into the anchoring steel pipe 2 pile to connect with the anchoring steel pipe 2, and the connecting ear plate 3 not welded to the anchoring steel pipe 2 can move along the slot to adjust the overall length of the temporary anchoring structure. Furthermore, a stiffening plate 4 is also provided at the end of the anchoring steel pipe 2, and a slot for inserting the stiffening plate 4 is provided at the end of the anchoring steel pipe 2, and the stiffening plate 4 passes through the slot to connect with the connecting ear plate 3 at the end. By adding a stiffening plate 4 between the anchoring steel pipe 2 and the connecting ear plate 3, the connection strength between the anchoring steel plate and the connecting ear plate 3 can be further strengthened.

[0040] The two ends of the anchoring steel pipe 2 are respectively connected to an anchor seat 1 anchored on the side wall of the bridge structure through connecting ear plates 3, wherein the anchor seat 1 installed on the cable tower includes a first connecting support plate 11 and an embedded part embedded in the cable tower, and the first connecting support plate 11 and the embedded part embedded in the cable tower are locked and fixed by anchor rods and nuts.

[0041] The end of the temporary anchoring structure in the longitudinal direction of the bridge connected to the cable tower serves as the tension end, and its embedded parts include an embedded sleeve buried in the cable tower, which extends along the longitudinal direction of the bridge. The anchor rod passes through the embedded sleeve, one end of the anchor rod is anchored in the cable tower, and the other end of the anchor rod passes through the first connecting support plate 11 and is locked and fixed to the first connecting support plate 11 by a nut.

[0042] As a further preference, in this embodiment, a plurality of embedded sleeves are provided, and a plurality of anchor rods are provided corresponding to the embedded sleeves, so that the first connecting support plate 11 can be supported at multiple points, so that the tension exerted on the first connecting support plate 11 can be transmitted to the tower concrete structure through the anchor rods and the embedded sleeves. The provision of the embedded sleeves can ensure the bearing capacity of the first connecting support plate 11 without the need to install additional prestressed steel bars.

[0043] The anchor seat 1 installed on the side wall of the cantilever steel box girder to be connected includes a second connection support plate 13 and an internal connection seat 14. The internal connection seat 14 is arranged corresponding to the second connection support plate 13, and the internal connection seat 14 is welded to the inner wall of the cantilever steel box girder. The second connection support plate 13 and the internal connection seat 14 are fixed by bolts passing through the side wall of the cantilever steel box girder.

[0044] The connecting ear plates 3 at both ends of the anchor steel box and the first connecting support plate 11 and the second connecting support plate 13 are provided with pin holes of the same size for pins to pass through for connection, without the need to expand the pin holes on site, thus reducing the difficulty of on-site construction and avoiding the influence of temporary expansion on the stress of the structure. In a preferred embodiment, two connecting ear plates 3 are provided at the end of the anchor steel pipe 2 of the present application, and one connecting support plate on the anchor seat 1 can be provided and inserted between the two connecting ear plates 3, or vice versa. When the connecting support plate of the anchor seat 1 is docked with the connecting ear plate 3, it is necessary to align the pin hole of the connecting support plate with the pin hole of the connecting ear plate 3.

[0045] In addition, in this embodiment, it is preferred to use a φ1020×12 steel pipe as the anchoring steel pipe 2 to ensure the structural strength of the temporary anchoring structure of the present application, and the above-mentioned connecting ear plate 3 and stiffening plate 4 can only be welded on the outside of the anchoring steel pipe 2 after the end of the anchoring steel pipe 2 is opened.

[0046] In summary, the temporary anchoring structure in the longitudinal direction of the bridge of the present application is pinned to the anchor seat 1 through the connecting ear plates 3 at both ends of the anchoring steel pipe 2, so as to temporarily consolidate the cable tower and the construction cantilever steel box girder, limit the construction cantilever steel box girder, and resist the unbalanced bending moment and longitudinal and transverse horizontal forces in the cantilever construction process.

[0047] The temporary anchorage structure in the longitudinal direction of the bridge of the present application adopts a tension-compression structure with pins at both ends, which is easy to construct, and a pre-buried steel pipe 12 is arranged in the cable tower as the anchor seat 1 at the tension end, which can meet the force requirements of the temporary anchorage structure in the longitudinal direction of the bridge, and there is no need to set up prestressed steel bars separately, which is convenient for on-site construction.

[0048] In addition, the two ends of the anchor steel pipe 2 are pinned to the anchor seat 1 through the connecting ear plate 3. At the same time, the first connecting support plate 11 and the second connecting support plate 13 of the anchor seat 1 are detachably connected to the cable tower and the corresponding cantilever steel box girder, and there is no need to expand the pin hole, thereby reducing the accuracy requirements for on-site installation. After the cantilever construction is completed, the anchor steel pipe 2, the first connecting support plate 11, and the second connecting support plate 13 can be used in a cyclic manner to reduce the construction cost. The embedded steel pipe 12 retained inside the cable tower also serves as a structural reinforcement inside the cable tower to improve the structural strength of the cable tower.

[0049] The present application also relates to a method for installing the above-mentioned temporary anchoring structure in the longitudinal direction of the bridge, which specifically includes the following distinguishing technical features:

[0050] First, the processed temporary anchoring structure is transported to the construction site.

[0051] When processing the temporary anchoring structure, the anchoring steel pipe 2 of the temporary anchoring structure is welded and fixed to the connecting ear plate 3 at one end thereof, and the connecting ear plate 3 at the other end thereof is movably connected to the anchoring steel pipe 2, and the connecting ear plate 3 at this end is adjustable in the position of the anchoring steel pipe 2 along the longitudinal direction of the bridge, thereby facilitating the installation of the anchoring steel pipe 2 by adjusting the length of the anchoring steel pipe 2 for adaptive connection according to the spacing between the cable tower and the cantilever steel box girder to be connected.

[0052] Before installing the anchor steel pipe 2, firstly, anchor embedded parts of a temporary anchor structure are arranged on the side wall of the cable tower along the longitudinal direction of the bridge and the cantilever steel box girder to be connected, and the connection support plate is installed.

[0053] The anchor embedded parts at the cable tower are embedded steel pipes 12, and the anchor embedded parts of the cantilever steel box girder to be connected are internal connecting seats 14 welded to the inner wall of the cantilever steel box girder. The first connecting support plate 11 of the anchor seat 1 at the cable tower and the embedded steel pipe 12 are locked and fixed by anchor rods and nuts, and the second connecting support plate 13 at the cantilever steel box girder and the internal connecting seat 14 of the cantilever steel box girder can be locked and fixed by bolts.

[0054] Finally, the two ends of the temporary anchoring structure are bolted and fixed to the connecting bearing plates on the cable tower and the cantilever steel box girder respectively to complete the temporary anchoring of the cable tower and the cantilever steel box girder along the longitudinal direction of the bridge.

[0055] Specifically, firstly, one end of the anchor steel pipe 2 welded to the connecting ear plate 3 is bolted to the connecting support plate at the cable tower, and then the position of the connecting ear plate 3 at the other end of the anchor steel pipe 2 is adjusted so that the connecting ear plate 3 is bolted to the connecting support plate on the cantilever steel box girder to be connected; the unwelded end of the anchor steel pipe 2 is welded and fixed to the connecting ear plate 3 after the position is adjusted to complete the installation of the temporary anchoring structure in the longitudinal direction of the bridge.

[0056] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A temporary anchoring structure in the longitudinal direction of a bridge, characterized in that: It includes an anchor seat, an anchor steel pipe and a connecting ear plate, wherein two anchor seats are arranged and are respectively anchored on the cable tower along the longitudinal bridge direction and the cantilever steel box girder to be connected, the connecting ear plates are arranged at both ends of the anchor steel pipe, and the two ends of the anchor steel pipe are respectively fixed to the anchor seat anchored on the surface of the bridge structure through the connecting ear plates, the connecting ear plate at one end of the anchor steel pipe is fixed to it, and the connecting ear plate at the other end is adjustable at the position of the anchor steel pipe along the longitudinal bridge direction, the anchor seat installed on the cable tower includes a first connecting support plate and an embedded part embedded in the cable tower, the first A connecting support plate is locked and fixed to an embedded part embedded in a cable tower by means of anchor rods and nuts, the embedded part comprises an embedded sleeve embedded in the cable tower, the anchor rod passes through the embedded sleeve, one end of the anchor rod is anchored in the cable tower, and the other end is locked and fixed to the first connecting support plate by means of a nut, the anchor seat installed on the cantilever steel box girder to be connected comprises a second connecting support plate and an internal connecting seat, the internal connecting seat is welded to the inner side wall of the cantilever steel box girder, the second connecting support plate and the internal connecting seat are connected and fixed by bolts penetrating the side wall of the cantilever steel box girder.

2. The temporary anchoring structure in the longitudinal direction of the bridge according to claim 1 is characterized in that: The end of the anchoring steel pipe is provided with a slot extending along the longitudinal bridge direction, and the connecting ear plate is inserted into the slot and connected to the anchoring steel pipe.

3. The temporary anchoring structure in the longitudinal direction of the bridge according to claim 2 is characterized in that: A stiffening plate is provided at the end of the anchoring steel pipe, and a slot for inserting the stiffening plate is provided at the end of the anchoring steel pipe. The stiffening plate passes through the slot and is connected to the connecting ear plate.

4. The temporary anchoring structure in the longitudinal direction of the bridge according to claim 1 is characterized in that: The connecting ear plates at both ends of the anchoring steel pipe and the cable tower and the anchoring seats on the cantilever steel box girder to be connected are provided with pin holes of the same size.

5. A method for installing a temporary anchoring structure in the longitudinal direction of a bridge as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Transport the processed temporary anchoring structure to the construction site; Anchor embedded parts of temporary anchoring structures are arranged on the side walls of the cable towers and cantilever steel box girders to be connected along the longitudinal direction of the bridge, and connecting bearing plates are installed; The two ends of the temporary anchoring structure are pinned and fixed to the connecting bearing plates on the cable tower and the cantilever steel box girder respectively, so as to complete the temporary anchoring of the cable tower and the cantilever steel box girder along the longitudinal direction of the bridge.

6. The method for installing a temporary anchoring structure in the longitudinal direction of a bridge according to claim 5 is characterized in that: When processing the temporary anchoring structure, the anchoring steel pipe of the temporary anchoring structure is welded and fixed to the connecting ear plate at one end, and the connecting ear plate at the other end is movably connected to the anchoring steel pipe, and the connecting ear plate at this end is adjustable in the position of the anchoring steel pipe along the longitudinal bridge direction.

7. The method for installing a temporary anchoring structure in the longitudinal direction of a bridge according to claim 6 is characterized in that: The pinning and fixing of the two ends of the temporary anchoring structure to the connecting bearing plates on the cable tower and the cantilever steel box beam respectively comprises the following steps: Pin one end of the anchor steel pipe welded to the connecting ear plate to the connecting support plate at the cable tower; Adjust the position of the connecting ear plate at the other end of the anchor steel pipe so that the connecting ear plate is pin-connected with the connecting support plate on the cantilever steel box girder to be connected; The unwelded end of the anchor steel pipe is welded and fixed to the connecting ear plate after the position is adjusted.

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