Support frame cantilever structure for erecting steel box girder bridge

Abstract

The utility model belongs to the technical field of building construction, and discloses a support frame cantilever structure for erecting a steel box girder bridge, which comprises an upright post, channel steel and a distribution girder, and is characterized in that the channel steel is welded on the side edge of the upright post of an interlayer temporary support measure according to the stability principle of a triangle for fixing and lengthening; an extension distribution beam at the upper part of the temporary support measure is welded with channel steel, so that the purpose of erecting a steel box girder block body of which the top two layers are lifted out is achieved, the contact surface between the support structure and the bottom of the steel box girder is extended, the purpose of bearing is achieved, and the risk of high-altitude operation is reduced; by welding the distribution beams, repeated assembly of the support is avoided, labor is reduced, operation time is shortened, risks of high-altitude lifting of the support are reduced, complexity is changed into simplicity, and the efficiency of erecting the box beams is improved. Compared with a traditional temporary support erecting mode, the time for assembling and hoisting in place is saved, cost is reduced, and efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and in particular relates to a support frame cantilever structure for erecting a steel box girder bridge. Background Art

[0002] At present, with the development of society, many cross-line bridges adopt steel box girder type for the convenience of construction. Steel box girder bridges adopt segmented design, and temporary support measures are required between segments, which is more conducive to speeding up the construction progress and improving safety performance.

[0003] While assembling temporary supports, due to the particularity of double-deck steel box girder bridges, the width of the upper bridge is greater than that of the lower bridge, so an additional set of temporary supports is required for support. At this time, it is necessary to cut materials again for welding, which increases construction costs and reduces the efficiency of bridge erection. Therefore, how to solve the erection problem of different widths of upper and lower box girders through some measures under existing conditions has become the key to saving construction time and improving production efficiency. Summary of the invention

[0004] The utility model aims to provide a cantilever structure of a support frame for erecting a steel box girder bridge, so as to solve the erection problem of different widths of upper and lower box girders of a double-layer steel box girder bridge in the prior art, and at the same time achieve the purpose of saving construction period and improving production efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a cantilever structure of a support frame for erecting a steel box girder bridge, comprising a plurality of columns, a plurality of channel steels are arranged between the columns, the channel steels are connected in pairs to form a triangular support, the columns and the channel steels form a bracket, a distribution beam is arranged on the top of the bracket, and the channel steels are connected between the distribution beam and the columns.

[0007] A further improvement of the utility model is that the upright post is located on the first circular plate.

[0008] A further improvement of the utility model is that a second circular plate is arranged on the top of the column.

[0009] A further improvement of the utility model is that a positioning triangle plate is arranged between the column and the first circular plate and the second circular plate.

[0010] A further improvement of the utility model is that the channel steel is fixed on the column by welding.

[0011] A further improvement of the utility model is that a triangular support structure is welded between the distribution beam and the channel steel.

[0012] A further improvement of the utility model is that the distribution beam and the top of the support frame are fixedly connected by double-sided welding and circumferential welding.

[0013] A further improvement of the utility model is that the distribution beam is an H-shaped steel beam.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model welds a plurality of channel steels between a plurality of columns so that the channel steels are butted in pairs to form a triangular support. The columns and the channel steels form a bracket. A distribution beam is arranged on the top of the bracket. The channel steels are connected between the distribution beam and the columns. This can support and disperse concentrated stress, extend the contact surface between the support structure and the bottom of the steel box beam, achieve the purpose of supporting, and reduce the risk of high-altitude operations. The welding of distribution beams avoids repeated assembly of brackets, reduces labor, shortens operation time, reduces the risk of high-altitude hoisting brackets, simplifies complexity, and improves the efficiency of erecting box beams. Compared with the traditional method of setting up temporary supports, this saves time for assembly and hoisting into place, reduces costs and increases efficiency.

[0016] Furthermore, positioning triangle plates are arranged between the columns and the first circular plate and the second circular plate to reinforce the system.

[0017] Furthermore, the triangular support structure welded between the distribution beam and the channel steel can support and disperse the stress, extend the contact surface between the support structure and the bottom of the steel box beam, and achieve the purpose of support. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of an assembly bracket of the utility model;

[0019] Figure 2 This is a schematic diagram of the cantilever structure of the support frame of the utility model;

[0020] Figure 3 It is a schematic diagram of a double-deck steel box girder bridge according to an embodiment of the utility model.

[0021] Among them, 1-1, the first circular plate; 1-2, the second circular plate; 2, the column; 3, the channel steel; 4, the positioning triangle plate; 5, the distribution beam. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to common technical knowledge and conventional means in the field, which should all be included in the protection scope of the present invention.

[0023] See also Figure 1 , 2The support frame cantilever structure for erecting a steel box girder bridge comprises a first circular plate 1-1, a second circular plate 1-2, a column 2, a channel steel 3, a positioning triangle plate 4 and a distribution beam 5, wherein the first circular plate 1-1 is welded to the bottom precast concrete foundation embedded parts, the column 2 is welded on the first circular plate 1-1, and the positioning triangle plate 4 is welded, the second circular plate 1-2 is welded on the top of the column 2, and the positioning triangle plate 4 is welded to reinforce the system; a plurality of channel steels 3 are welded between a plurality of columns 2, so that the channel steels 3 are connected in pairs to form a triangular support structure, and a distribution beam 5 is arranged in the length direction of the top of the bracket, the distribution beam 5 is used for support and dispersion of concentrated stress, the distribution beam 5 is an H-shaped steel beam, the distribution beam 5 and the top of the support frame are fixedly connected by double-sided welding and circumferential welding, and the channel steel 3 is welded between the extended distribution beam 5 and the column 2, and the triangular support structure is welded between the distribution beam 5 and the channel steel 3 to form a support frame cantilever structure.

[0024] The first positioning circular plate 1-1 is positioned and welded to the bottom precast concrete foundation embedded parts, the bracket is assembled outside the site, the column 2 bracket is hoisted into place, the column 2 bracket is welded to the bottom positioning first circular plate 1-1, and the positioning triangle plate 4 is welded, the second cover circular plate 1-2 is welded to the top of the column 2, and then the positioning triangle plate 4 is welded, the distribution beam 5 with a pre-calculated length is welded and fixed to the top of the support frame, and double-sided welding and surrounding welding are adopted. First, the longest diagonal brace is welded and fixed between the bracket and the distribution beam 5, and then the internal small diagonal brace is welded to finally form a complete cantilever support frame system.

[0025] Example:

[0026] See also Figure 3 The present embodiment is a cantilever structure of a double-layer steel box girder bridge support frame. A 400×8 circular plate 1 is used at the bottom. A positioning triangle plate 4 is welded on the first circular plate 1-1. The positioning triangle plate 4 has a specification of 80×150×8 and is used to reinforce the system. A fillet weld is used to weld the first circular plate 1-1 and the column 2. The column 2 uses a circular tube with a model of Ф273×7mm. The columns 2 are fully welded by 14a channel steels 3. The channel steels 3 are connected in pairs to form a triangular support structure. An H-shaped steel is set as a distribution beam 5 in the length direction of the top of the combined structural support of the steel pipe column 2. The H-shaped steel model is HM400×300. The distribution beam 5 is double-sided welded and surrounded with the top of the support, and the channel steel 3 is fully welded between the extended distribution beam 5 and the steel pipe column 2 to form a complete cantilever support frame system.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field can still modify or replace the specific implementation methods of the present invention. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A cantilever structure of a support frame for erecting a steel box girder bridge, characterized in that: The invention comprises a plurality of columns (2), a plurality of channel steels (3) are arranged between the columns (2), the channel steels (3) are connected in pairs to form a triangular support, the columns (2) and the channel steels (3) form a bracket, a distribution beam (5) is arranged on the top of the bracket, and the channel steels (3) are connected between the distribution beam (5) and the columns (2).

2. The cantilever structure of a support frame for erecting a steel box girder bridge according to claim 1, characterized in that: The column (2) is located on the first circular plate (1-1).

3. The cantilever structure of the support frame for erecting a steel box girder bridge according to claim 2 is characterized in that: A second circular plate (1-2) is arranged on the top of the column (2).

4. The cantilever structure of a support frame for erecting a steel box girder bridge according to claim 1, characterized in that: A positioning triangle plate (4) is arranged between the upright column (2) and the first circular plate (1-1) and the second circular plate (1-2).

5. The cantilever structure of the support frame for erecting a steel box girder bridge according to claim 1, characterized in that: The channel steel (3) is fixed on the column (2) by welding.

6. The cantilever structure of a support frame for erecting a steel box girder bridge according to claim 1, characterized in that: A triangular support structure is welded between the distribution beam (5) and the channel steel (3).

7. The cantilever structure of a support frame for erecting a steel box girder bridge according to claim 1, characterized in that: The distribution beam (5) is fixedly connected to the top of the support frame by double-sided welding and circumferential welding.

8. The cantilever structure of a support frame for erecting a steel box girder bridge according to claim 1, characterized in that: The distribution beam (5) is an H-shaped steel beam.

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