A separate three-box steel beam arching process

Abstract

The present application relates to a kind of separate three-box steel beam cambering process, make railway box, the railway box includes deck, bottom plate and circular web;Second, the railway box is redesigned;Then, according to the size of the circular web and deck after redesign, circular web is re-performed line type, and deck of the railway box is cold-rolled according to new line type;Finally, through the cooperation of transfer support and transfer car, the highway box and intermediate box prepared in advance are transported to the railway box, the highway box and intermediate box are fixed first, then pre-assembled with the railway box, the contact side of intermediate box and railway box is cut, and the cambering is completed.The cambering process of the present application, by redesigning the size of the railway box, and by pre-assembled way to pre-assemble the railway box with highway box, intermediate box, and then cooperate with the cambering of railway box, so that the intermediate box is corrected again, so that the line type can meet the design requirements, avoid adjustment when formal assembly subsequently.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a process for raising the arch of a separated three-box steel beam. Background Technology

[0002] The Xihoumen Road-Rail Bridge is a shared sea-crossing bridge for the Ningbo-Zhoushan Railway and the Ningbo-Zhoushan Expressway, spanning the Xihoumen Waterway and connecting Jintang Island and Cezi Island. Located 2.8 km north of the existing Xihoumen Road Bridge, the bridge has a total length of 3118.226 m, with the main span (the combined road-rail section) measuring 2664 m. The span combination is 70 m + 112 m + 406 m + 1488 m + 406 m + 112 m + 70 m. The Xihoumen Road-Rail Bridge's main span of 1488 meters is the world's largest span road-rail bridge; its deck width of 68 meters is the world's widest sea-crossing bridge.

[0003] The main girder of the Xihoumen Road-Rail Bridge consists of three streamlined, flat box girder sections, arranged on the same level as the road. The middle box carries the railway, while the two side boxes carry the highway. The highway box and the railway box are connected by longitudinally spaced box-shaped crossbeams. The railway box has an inner height of 5m at its symmetrical centerline and a total width of 13.1m. The orthotropic steel bridge deck has a 2% cross slope in both directions. The bridge deck has 16 U-ribs and 7 plate ribs longitudinally. The U-ribs are 8mm thick and 600mm apart at the center. The bottom plate consists of a straight section and an arc section. The arc section has a radius of 4.5m and is tangent to the straight section. The longitudinal stiffening ribs of the bottom plate consist of 5 U-ribs on the straight section and 16 plate ribs on the arc section. The U-ribs are 6, 8, and 10mm thick and 825mm apart at the center; the plate ribs are spaced 400mm apart.

[0004] When constructing the aforementioned railway box girder, an arching technique is required to create the bidirectional cross slopes on both sides of the box girder. Traditional arching techniques often involve arching each box girder independently. However, the main beam of the aforementioned railway box girder and highway box girder form a three-box structure. After arching, the railway box girder needs to be coordinated with the highway box girder. If the railway box girder is arched independently, adjustments would be required when coordinating with the highway box girder, which is very troublesome. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a convenient arching process for a split three-box steel beam.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: a cambering process for a split three-box steel beam, wherein the split three-box steel beam includes a railway box located in the middle and highway boxes located on both sides of the railway box, and the railway box and the highway box are connected by a transition box. Its innovation lies in that the cambering process includes the following steps:

[0007] S1: First, manufacture the railway box, which includes a bridge deck, a bottom plate, and an arc web. The bridge deck has a 2% cross slope in both directions. U-ribs and plate ribs are provided in the longitudinal direction of the bridge deck. The bottom plate is composed of a straight section and an arc section. Longitudinal stiffening ribs are also provided on the bottom plate. The longitudinal stiffening ribs include U-ribs provided on the straight section of the bottom plate and plate ribs provided on the arc section of the bottom plate. Several arc webs are provided between the bridge deck and the bottom plate, distributed longitudinally. The top of the arc web is perpendicular to the bridge deck, and the bottom of the arc web is tangent to the arc section of the bottom plate.

[0008] S2: Secondly, the railway box girder was redesigned, changing the cross slope on both sides of the bridge deck from 2% to 2.08%, and reducing the width of the top two sides of the arc web by 5mm.

[0009] S3: Then, based on the dimensions of the redesigned arc web and bridge deck, the arc web is redrawn and the line type is redrawn, and the bridge deck of the railway box is cold rolled according to the new line type.

[0010] S4: Finally, the pre-prepared road box and intermediate box are transported to the railway box by the cooperation of the transfer bracket and the transfer vehicle. The road box and intermediate box are fixed first, and then pre-assembled with the railway box. Then, the arch is raised. As the railway box is raised, the road box and intermediate box are rotated along the railway box. Based on the result of the rotation, the contact side of the intermediate box and the railway box is cut so that the intermediate box can fit with the outer wall of the arc section of the bottom plate of the railway box, thus completing the arch.

[0011] Furthermore, the inner height at the symmetrical center line of the railway box is 5m, the total width is 13.1m, the U-ribs on the bridge deck are 8mm thick, and the center distance is 600mm; the arc radius of the bottom plate is 4.5m and it is tangent to the straight section. The U-ribs on the straight section have three thicknesses: 6mm, 8mm and 10mm, with a center distance of 825mm and a rib spacing of 400mm; the arc radius of the arc web is 4.5m, and 10 ribs are provided on the inner side of the arc web, with a rib spacing of 400mm.

[0012] Furthermore, in step S3, during cold rolling, the bending angle of the bridge deck of the railway box is controlled to be 177.6°.

[0013] The advantages of this invention are as follows: The separate three-box steel beam arching process of this invention redesigns the size of the railway box and pre-assembles the railway box, highway box, and intermediate box through pre-assembly. Then, with the arching of the railway box, the intermediate box is further modified so that the line can meet the design requirements and avoids the need for adjustments during subsequent formal assembly. Attached Figure Description

[0014] Figures 1-5 This is a flowchart of the arching process for the separated three-box steel beam of the present invention.

[0015] Figure 6 for Figure 5 Enlarged schematic diagram of part A.

[0016] Figure 7 This is a top view of the split three-box steel beam in this invention. Detailed Implementation

[0017] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0018] The split three-box steel beam includes a railway box 11 in the middle and highway boxes 13 on both sides of the railway box 11. The railway box 11 and the highway box 13 are connected by an intermediate box 12.

[0019] The following is in conjunction with the appendix Figure 1-6 The arching process of the separated three-box steel beam of the present invention is described in detail below:

[0020] S1: First, the railway box 11 is manufactured. The railway box 11 includes a bridge deck 1, a bottom plate 2, and an arc web 3. The bridge deck 1 is provided with a two-way 2% cross slope. U-ribs and plate ribs are provided in the longitudinal direction of the bridge deck 1. The bottom plate 2 is composed of a straight section 21 and an arc section 22. Longitudinal stiffening ribs are also provided on the bottom plate 2. The longitudinal stiffening ribs include U-ribs 23 provided on the straight section 21 of the bottom plate 2 and plate ribs 24 provided on the arc section 22 of the bottom plate 2. Several arc webs 3 are provided between the bridge deck 1 and the bottom plate 2. The top of the arc web 3 is perpendicular to the bridge deck 1, and the bottom of the arc web 3 is tangent to the arc section 22 of the bottom plate 2.

[0021] The inner height of the railway box girder at its symmetrical centerline is 5m, and its total width is 13.1m. The U-ribs on the bridge deck 1 are 8mm thick and 600mm apart at the center. The arc segment 22 of the bottom plate 2 has a radius of 4.5m and is tangent to the straight segment. The U-ribs 23 on the straight segment 21 have three thicknesses: 6mm, 8mm, and 10mm, with a center distance of 825mm and a rib spacing of 400mm. The arc web 3 has a radius of 4.5m, and 10 ribs are provided on the inner side of the arc web 3 with a rib spacing of 400mm.

[0022] S2: Secondly, the railway box 11 is redesigned, and the cross slope on both sides of the bridge deck 1 of the railway box 11 is changed from 2% to 2.08%, such as... Figure 3As shown, the width of both sides of the top of the arc-shaped web 3 is reduced by 5mm, as follows. Figure 1 As shown, and after the dimensions of the arc web 3 change, the cross slopes on both sides of the bridge deck 1 also change accordingly, such as... Figure 2 As shown, Figure 2 The red arrow in the middle represents the slope of bridge deck 1 after the change in cross slope.

[0023] S3: Then, based on the redesigned dimensions of the arc web 3 and the bridge deck 1, the arc web 3 is redrawn with new lines, and the bridge deck 1 of the railway box is cold-rolled according to the new lines. During cold rolling, the bending angle of the bridge deck 1 of the railway box is controlled to be 177.6°. Figure 3 As shown.

[0024] S4: Finally, using the transfer bracket and transfer vehicle, the pre-prepared road box 13 and intermediate box 12 are transported to the railway box 11. The road box 13 and intermediate box 12 are first fixed, then pre-assembled with the railway box 11, and then arched, as follows. Figure 4 As shown, as the railway box 11 arches, the highway box 12 and the intermediate box 13 rotate as a whole along the railway box 11. Based on the result of the rotation, the contact side between the intermediate box 13 and the railway box 11 is trimmed, as shown. Figure 5 As shown, this allows the intermediate box 12 to fit against the outer wall of the arc segment 22 of the bottom plate 2 of the railway box 11, thus completing the arching.

[0025] like Figure 7As shown, during the cambering process, the separated three-box steel beam is first divided into segments, and each segment is sequentially defined as JB2, JB3, JB4, JB5, JB6, JB7, JB8, JB2, JB9, JB10, JB11, JB12, JB13, JB14, JB15, JB16, JB17, JB18, JB19, JB20, JB JB21, JB22, JB23, and JB24, JB16, and JB17 are segment D; JB18 and part of JB19 are segment C; the remaining JB19 and JB20 are segment B; JB21, JB22, JB23, and JB24 are segment A; the camber values ​​of JB2 are 46 and 94; the camber values ​​of JB3 are 96 and 102; and the camber values ​​of JB4 are 106 and 11. The camber value for JB5 is 110, for JB6 it is 110, for JB7 it is 110, for JB8 it is 110, for JB9 it is 110, for JB10 it is 110, for JB11 it is 110, for JB12 it is 110, for JB13 it is 106 and 100, and for JB14 it is 90 and 74. The camber value of JB15 is 60, the camber value of JB17 is 40, the camber value of JB17 is 20, the camber value of JB18 is 30 and 30, the camber value of JB19 is 40 and 50, the camber value of JB20 is 54 and 50, the camber value of JB21 is 38 and 16, the camber value of JB22 is 8 and 16, the camber value of JB23 is 8 and 4, and the camber value of JB24 is 0.

[0026] The cambering process of the three-box steel beam of the present invention redesigns the dimensions of the railway box and pre-assembles the railway box, highway box, and intermediate box through pre-assembly. Then, the cambering of the railway box is combined with the cambering of the intermediate box to make the line shape meet the design requirements and avoid the need for adjustments during the subsequent formal assembly.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A process for arching a split three-box steel beam, the split three-box steel beam comprising a railway box located in the middle and highway boxes located on both sides of the railway box, wherein the railway box and the highway box are connected by an intermediate box, characterized in that: The arching process includes the following steps S1: First, manufacture the railway box, which includes a bridge deck, a bottom plate, and an arc web. The bridge deck has a 2% cross slope in both directions. U-ribs and plate ribs are provided in the longitudinal direction of the bridge deck. The bottom plate is composed of a straight section and an arc section. Longitudinal stiffening ribs are also provided on the bottom plate. The longitudinal stiffening ribs include U-ribs provided on the straight section of the bottom plate and plate ribs provided on the arc section of the bottom plate. Several arc webs are provided between the bridge deck and the bottom plate, distributed longitudinally. The top of the arc web is perpendicular to the bridge deck, and the bottom of the arc web is tangent to the arc section of the bottom plate. S2: Secondly, the railway box girder was redesigned, changing the cross slope on both sides of the bridge deck from 2% to 2.08%, and reducing the width of the top two sides of the arc web by 5mm. S3: Then, based on the dimensions of the redesigned arc web and bridge deck, the arc web is redrawn and the line type is redrawn, and the bridge deck of the railway box is cold rolled according to the new line type. S4: Finally, the pre-prepared road box and intermediate box are transported to the railway box by the cooperation of the transfer bracket and the transfer vehicle. The road box and intermediate box are fixed first, and then pre-assembled with the railway box. Then, the arch is raised. As the railway box is raised, the road box and intermediate box are rotated along the railway box. Based on the result of the rotation, the contact side of the intermediate box and the railway box is cut so that the intermediate box can fit with the outer wall of the arc section of the bottom plate of the railway box, thus completing the arch.

2. The arching process for the separated three-box steel beams according to claim 1, characterized in that: The inner height of the railway box girder at its symmetrical centerline is 5m, and its total width is 13.1m. The U-ribs on the bridge deck are 8mm thick and 600mm apart at the center. The arc section of the bottom plate has a radius of 4.5m and is tangent to the straight section. The U-ribs on the straight section have three thicknesses: 6mm, 8mm, and 10mm, with a center distance of 825mm and a rib spacing of 400mm. The arc web has a radius of 4.5m, and 10 ribs are provided on the inner side of the arc web, with a rib spacing of 400mm.

3. The arching process for the separated three-box steel beams according to claim 1, characterized in that: In step S3, during cold rolling, the bending angle of the bridge deck of the railway box is controlled to be 177.6°.

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