A cable sleeve structure for a steel box girder cable-stayed bridge and a post-installation construction method

Abstract

The present invention provides a cable sleeve structure and post-installation construction method for a steel box girder cable-stayed bridge. The interior of the steel box girder is provided with a structural diaphragm, on which an anchor box structure is fixedly installed. The anchor box structure includes symmetrically arranged side panels, with sealing plates symmetrically and vertically fixed to the top and bottom ends of the side panels to form a four-sided closed anchor box structure. The bottom end of the anchor box structure is fixed with a seat plate and an anchor pad. A cable sleeve is installed inside the anchor box structure, and the top end of the cable sleeve passes through the bridge deck of the steel box girder. A sealing plate is fixed at the intersection of the cable sleeve and the bridge deck. This structure and post-installation construction method adopts a method of first arranging the cable sleeves, then repositioning and adjusting the cable sleeves and the inclined cables at the construction site, and then fixing them. This effectively overcomes the cumulative error influence of the installation elevation deviation and mileage deviation of each steel box girder segment during the hoisting construction of the steel box girder segment, and ensures that the actual coordinates of the cable sleeve meet the construction requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and more particularly relates to a cable sleeve structure of a steel box girder cable-stayed bridge and a post-installation method. Background Art

[0002] The installation accuracy of cable sleeves in cable-stayed bridges is directly related to the safe use of the cable structure, especially for steel box girder cable-stayed bridges. The steel box girders are processed according to the manufacturing line shape, and the installation coordinates of the cable sleeves are obtained through theoretical calculations and installed on-site. For example, the cable-beam anchoring structure of a steel box girder cable-stayed bridge disclosed in CN 208933827 U and the anchor plate assembly for a cable-stayed bridge disclosed in CN 211689847 U both use installation structures with pre-fixed cable sleeves that are currently processed on-site.

[0003] However, for steel box girder cable-stayed bridges with large spans and complex structures, during on-site installation and construction, due to the cumulative errors of the installation elevation deviation and mileage deviation of each steel box girder segment during the segment hoisting construction, there is a deviation between the cable sleeve positioning coordinates in the theoretical manufacturing line shape and the actual positioning coordinate requirements, which can easily cause interference between the cable and the cable sleeve position, resulting in friction and wear of the cable when the cable-stayed bridge is in operation, posing great safety and quality risks. Summary of the Invention

[0004] The purpose of the present invention is to provide a cable sleeve structure and a post-installation construction method for a steel box girder cable-stayed bridge. This structure and post-installation construction method adopt a method of first arranging the cable sleeves, then repositioning and adjusting the cable sleeves and the inclined cables at the construction site, and then fixing them. This effectively overcomes the cumulative error influence of the installation elevation deviation and mileage deviation of each steel box girder segment during the hoisting construction of the steel box girder segment, ensures that the actual coordinates of the cable sleeves meet the construction requirements, is easy to implement, and ensures the construction quality of the inclined cables.

[0005] In order to achieve the above technical features, the object of the present invention is achieved as follows: a cable sleeve structure of a steel box girder cable-stayed bridge, comprising a steel box girder, a structural diaphragm provided inside the steel box girder, and an anchor box structure fixedly installed on the structural diaphragm;

[0006] The anchor box structure comprises symmetrically arranged side panels, with sealing panels symmetrically and vertically fixed to the top and bottom ends of the side panels to form an anchor box structure closed on four sides;

[0007] A seat plate and an anchor pad are fixed to the bottom end of the anchor box structure;

[0008] A cable sleeve is installed inside the anchor box structure, the top end of the cable sleeve passes through the bridge deck of the steel box girder, and a sealing plate is fixed at the junction of the cable sleeve and the bridge deck.

[0009] The cable sleeve is not welded or fixed to the steel box girder structures before being manufactured and hoisted, and is in a free state.

[0010] The sealing plate, the seat plate, the structural transverse diaphragm and the cable transverse diaphragm are welded and fixed to form a force-bearing whole.

[0011] The anchor plate is only fixed to the seat plate by welding.

[0012] The sealing plate is welded and fixed to the bridge deck and the cable sleeve after the cable sleeve is adjusted into position.

[0013] Reinforced plates are fixed between the side plates, the sealing plate and the outer wall of the seat plate.

[0014] A post-installation construction method for a cable sleeve structure of a steel box girder cable-stayed bridge comprises the following steps:

[0015] Step 1: On-site processing of steel box beams:

[0016] According to the design drawings, assemble the structural diaphragms in the steel box girder assembly yard and complete the welding and installation of the skeleton structure of the steel box girder segments;

[0017] Step 2: On-site processing of the anchor box structure:

[0018] The anchor plate and the seat plate are welded into a whole. According to the spatial coordinates of the manufacturing line mid-side plate, the sealing plate and the seat plate, the three are welded at the connection position with the structural diaphragm and the cable diaphragm to complete the installation of the anchor box structure.

[0019] Step 3: On-site processing of the remaining steel box girders:

[0020] Splice and install the remaining structure of the steel box girder, use lifting equipment to insert the cable sleeve into the anchor box structure, and complete the overall assembly of the steel box girder;

[0021] Step 4: Installation and construction of steel box girder at the bridge site:

[0022] Transport the completed assembled steel box girder to the hoisting site in sections, hoist it, adjust the elevation and mileage coordinates of the steel box girder to meet the installation accuracy requirements, complete the precise positioning and splicing of the steel box girder, install the stay cables and tension them;

[0023] Step 5: Installation and construction of the remaining steel box girders at the bridge site:

[0024] Follow step 4 to complete the assembly of the remaining steel box girder segments and installation of the stay cables until the entire bridge is closed;

[0025] Step 6: Post-fixation of the cable sleeve:

[0026] Adjust the position of the cable sleeves placed in the steel anchor box one by one so that the installed inclined cable is in the center of the cable sleeve. Weld the sealing plate to fix the cable sleeve, and complete the installation of the cable sleeve shock absorber and corresponding structure.

[0027] The present invention has the following beneficial effects:

[0028] 1. The structure and post-installation construction method of the present invention adopts the method of first arranging the cable sleeves movably, then repositioning and adjusting the cable sleeves and the inclined cables at the construction site, and then fixing them. This effectively overcomes the cumulative error influence of the installation elevation deviation and mileage deviation of each steel box girder segment during the hoisting construction of the steel box girder segment, ensures that the actual coordinates of the cable sleeves meet the construction requirements, is easy to implement, and ensures the construction quality of the inclined cables.

[0029] 2. The structure of the present invention can eliminate the deviation between the cable sleeve positioning coordinates in the theoretical manufacturing line shape of the steel box girder and the actual positioning coordinates, avoid the interference between the inclined cables and the cable sleeve positions caused by the conventional method, and ensure the construction quality.

[0030] 3. When the present invention is implemented, no measuring instrument is needed to position and lay out the cable sleeve, the operation is simple, the steel box girder hoisting period is not occupied, and time and labor are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and examples.

[0032] Figure 1 This is a schematic cross-sectional view of the cable sleeve structure of the steel box girder cable-stayed bridge of the present invention.

[0033] Figure 2 It is a schematic longitudinal section of the cable sleeve structure of the steel box girder cable-stayed bridge of the present invention.

[0034] Figure 3 It is a construction method diagram of the present invention.

[0035] In the figure, there are sealing plates 1, cable sleeves 2, bridge deck panels 3, sealing plates 4, side panels 5, seat panels 6, anchor pads 7, structural diaphragms 8, cable diaphragms 9, steel box beams 10, anchor box structures 11, and stiffened panels 12. DETAILED DESCRIPTION

[0036] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0037] Example 1:

[0038] See also Figure 1-2A cable sleeve structure of a steel box girder cable-stayed bridge, which includes a steel box girder 10, a structural diaphragm 8 is provided inside the steel box girder 10, and an anchor box structure 11 is fixedly installed on the structural diaphragm 8; the anchor box structure 11 includes symmetrically arranged side panels 5, and the top and bottom ends of the side panels 5 are symmetrically and vertically fixed with sealing plates 4 to form an anchor box structure 11 closed on four sides; the bottom end of the anchor box structure 11 is fixed with a seat plate 6 and an anchor pad 7; a cable sleeve 2 is installed inside the anchor box structure 11, and the top end of the cable sleeve 2 passes through the bridge deck 3 of the steel box girder 10, and a sealing plate 1 is fixed at the junction of the cable sleeve 2 and the bridge deck 3. By adopting the above structure, during the specific construction process, the deviation between the cable sleeve positioning coordinates in the theoretical manufacturing line shape of the steel box girder and the actual positioning coordinates can be eliminated, and the interference between the inclined cable and the cable sleeve caused by the conventional method can be avoided. During implementation, no measuring instrument is required to position and lay out the cable sleeve, the operation is simple, and the steel box girder hoisting period is not occupied, which saves time and effort and ensures the construction quality.

[0039] Furthermore, the cable sleeve 2 is not welded or fixed to the steel box girder structure before manufacturing and hoisting, and is in a free state. This arrangement ensures that the cable sleeve 2 is fixed after arriving at the construction site, thereby effectively eliminating the installation and positioning errors of the cable sleeve 2 during the manufacturing process.

[0040] Furthermore, the sealing plate 4, the seat plate 6, the structural diaphragm 8 and the cable diaphragm 9 are welded and fixed to form a force-bearing whole. The above-mentioned integral structure can form a force-bearing whole, thereby ensuring the reliability of the fixed installation of the entire cable sleeve 2 and ensuring the structural strength and stability.

[0041] Furthermore, the anchor plate 7 is only welded to the seat plate 6.

[0042] Furthermore, the sealing plate 1 is welded to the bridge deck 3 and the cable sleeve 2 after the cable sleeve 2 is adjusted into position. The above-mentioned post-fixing structure ensures the positioning accuracy of the cable sleeve 2 during the subsequent on-site installation process, avoids the deviation between the cable sleeve positioning coordinates in the traditional theoretical manufacturing line shape and the actual positioning coordinate requirements, avoids interference between the cable and the cable sleeve position, and effectively overcomes the friction and wear of the cable during the operation of the cable-stayed bridge, which may cause safety and quality risks.

[0043] Furthermore, a stiffening plate 12 is fixed between the side panels 5, the sealing plate 4 and the outer wall of the seat panel 6. The stiffening plate 12 enhances the connection strength and stability of the side panels 5, the sealing plate 4 and the seat panel 6 with the stiffening plate 12.

[0044] Example 2:

[0045] See also Figure 3 A post-installation construction method for a cable sleeve structure of a steel box girder cable-stayed bridge comprises the following steps:

[0046] Step 1: On-site processing of steel box girder 10:

[0047] According to the design drawings, the structural diaphragm 8 is assembled in the steel box girder assembly yard, and the skeleton structure welding and installation of the steel box girder 10 segments are completed;

[0048] Step 2: On-site processing of the anchor box structure 11:

[0049] The anchor plate 7 and the seat plate 6 are welded into a whole. According to the spatial coordinates of the manufacturing linear middle side plate 5, the sealing plate 4 and the seat plate 6, the three are welded at the connection position with the structural diaphragm 8 and the cable diaphragm 9 to complete the installation of the anchor box structure 11.

[0050] Step 3: On-site processing of the remaining steel box beams 10:

[0051] Splice and install the remaining structure of the steel box girder 10, use a lifting device to insert the cable sleeve 2 into the anchor box structure 11, and complete the overall assembly of the steel box girder 10;

[0052] Step 4: Installation and construction of the steel box girder 10 at the bridge site:

[0053] Transport the completed assembled steel box girder in 10 segments to the hoisting site, hoist it, adjust the elevation and mileage coordinates of the steel box girder to meet the installation accuracy requirements, complete the precise positioning and splicing of the steel box girder, install the stay cables and tension them;

[0054] Step 5: Installation and construction of the remaining steel box girders 10 at the bridge site:

[0055] Follow step 4 to complete the assembly of the remaining 10 steel box girder segments and installation of the stay cables until the entire bridge is closed;

[0056] Step 6: Post-fixation of cable sleeve 2:

[0057] Adjust the position of the cable sleeve 2 placed in the steel anchor box 10 one by one so that the installed inclined cable is in the center of the cable sleeve 2, weld the sealing plate 1 to fix the cable sleeve 2, and complete the installation of the cable sleeve 2 shock absorber and corresponding structure.

Claims

1. A post-installation construction method for a steel box girder cable-stayed bridge cable sleeve structure, the steel box girder cable-stayed bridge cable sleeve structure comprising a steel box girder (10), a structural diaphragm (8) being provided inside the steel box girder (10), and an anchor box structure (11) being fixedly mounted on the structural diaphragm (8); The anchor box structure (11) comprises symmetrically arranged side panels (5), and the top and bottom ends of the side panels (5) are symmetrically and vertically fixed with sealing panels (4) to form a four-sided closed anchor box structure (11); A seat plate (6) and an anchor pad (7) are fixed to the bottom end of the anchor box structure (11); A cable sleeve (2) is installed inside the anchor box structure (11), the top end of the cable sleeve (2) passes through the bridge deck (3) of the steel box girder (10), and a sealing plate (1) is fixed at the junction of the cable sleeve (2) and the bridge deck (3); It is characterized by: The construction method comprises the following steps: Step 1: On-site processing of steel box beam (10): According to the design drawings, the structural diaphragm (8) is assembled in the steel box girder assembly yard to complete the welding and installation of the skeleton structure of the steel box girder (10) segment; Step 2: On-site processing of the anchor box structure (11): The anchor plate (7) and the seat plate (6) are welded into a whole, and the three are welded at the connection position with the structural diaphragm (8) and the cable diaphragm (9) according to the spatial coordinates of the manufacturing linear middle side plate (5), the sealing plate (4), and the seat plate (6), thereby completing the installation of the anchor box structure (11); Step 3: On-site processing of the remaining steel box beams (10): Splicing and installing the remaining structure of the steel box girder (10), using a lifting device to insert the cable sleeve (2) into the anchor box structure (11), and completing the overall assembly of the steel box girder (10); Step 4: Installation and construction of the steel box girder (10) at the bridge site: The assembled steel box girder (10) is transported to the hoisting site in sections, hoisted, and the elevation and mileage coordinates of the steel box girder are adjusted to meet the installation accuracy requirements, and the steel box girder is accurately positioned and spliced, and the inclined cables are installed and tensioned; Step 5: Installation and construction of the remaining steel box beams (10) at the bridge site: According to step 4, the remaining steel box beam (10) segments are assembled and the cable stays are installed until the entire bridge is closed; Step 6: Post-fixation of the cable sleeve (2): The positions of the cable sleeves (2) placed in the anchor box structure (11) are adjusted one by one so that the installed inclined cables are located at the center of the cable sleeves (2). The sealing plates (1) are welded to fix the cable sleeves (2), thereby completing the installation of the cable sleeves (2) shock absorbers and corresponding structures.

2. The post-installation construction method of the cable sleeve structure of a steel box girder cable-stayed bridge according to claim 1, characterized in that: The cable sleeve (2) is not welded or fixed to the steel box beam structures before manufacturing and hoisting, and is in a free state.

3. The post-installation construction method of the cable sleeve structure of a steel box girder cable-stayed bridge according to claim 1, characterized in that: The sealing plate (4), the seat plate (6), the structural diaphragm (8) and the cable diaphragm (9) are welded and fixed to form a force-bearing whole.

4. The post-installation construction method of the cable sleeve structure of a steel box girder cable-stayed bridge according to claim 1, characterized in that: The anchor plate (7) is only welded and fixed to the seat plate (6).

5. The post-installation construction method of the cable sleeve structure of a steel box girder cable-stayed bridge according to claim 1, characterized in that: After the cable sleeve (2) is adjusted into position, the sealing plate (1) is welded and fixed to the bridge deck (3) and the cable sleeve (2).

6. The post-installation construction method of the cable sleeve structure of a steel box girder cable-stayed bridge according to claim 1, characterized in that: A stiffening plate (12) is fixed between the side plate (5), the sealing plate (4) and the outer wall of the seat plate (6).

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