Rapidly-assembled combined box girder

Abstract

The utility model discloses a combined box girder capable of being quickly assembled, and belongs to the technical field of bridge engineering. Comprising a top plate, a transverse partition plate and a U-shaped steel beam, a groove is formed in the U-shaped steel beam, the transverse partition plate is inserted into the groove, clamping blocks are arranged on the two sides of the upper portion of the transverse partition plate, the clamping blocks fall into clamping grooves formed in the inner wall of the U-shaped steel beam, and a sliding groove is formed in the lower surface of the top plate. The sliding groove is fixedly connected to the upper portion of the U-shaped steel beam and the upper portion of the transverse partition plate. The combined box beam structure can be quickly assembled, the U-shaped steel beams are matched with the top plates and the transverse partition plates, and the height of the obtained combined box beam is smaller than that of a traditional prestressed concrete beam; the fabricated combined box girder can be prefabricated in a factory, standardized production is facilitated, the quality is reliable, the fabricated combined box girder is transported to the site in batches to be assembled and hoisted, the construction speed is high, and the construction efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a quickly assembled combined box girder. Background Art

[0002] Prestressed concrete box girders are common in the superstructures of highways and national and provincial highway bridges in my country. However, cracks are common in box girders in service. These cracks are mainly concentrated in the webs near the bottom plate in the mid-span or the fulcrum. Not only does this pose a serious structural safety hazard, but the cracks also cause the bridge stiffness to decrease and the mid-span position to continue to deflect, affecting the normal use of the bridge. These cracks have been exposed to a corrosive atmospheric environment for a long time, further exacerbating the rust of the box girder steel bars and the carbonization of the concrete. Most of these bridges are open to traffic, with rivers or deep valleys under the bridges. The box girders are very high from the ground, making repair very difficult and ineffective.

[0003] Traditional box girders inevitably have some micro cracks during construction due to the low tensile strength of ordinary concrete, shrinkage creep, improper construction and other factors. During the operation period, overload, temperature changes and other factors further aggravate the development of cracks. Steel box girders have the advantages of small deformation and stable structure. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a quickly assembled combined box girder.

[0005] The utility model is realized by the following technical solutions:

[0006] A quick-assembled combined box girder comprises a top plate, a transverse partition and a U-shaped steel beam, wherein a groove is provided inside the U-shaped steel beam, the transverse partition is inserted inside the groove, blocks are provided on both sides of the upper part of the transverse partition, the blocks fall into the grooves provided on the inner wall of the U-shaped steel beam, and a slide groove is provided on the lower surface of the top plate, and the slide groove is fixedly connected above the U-shaped steel beam and the transverse partition.

[0007] A hand-holding portion is provided above the inner wall of the diaphragm.

[0008] The upper end of the U-shaped steel beam is provided with a trapezoidal end portion, and the trapezoidal end portion is clamped with a sliding groove.

[0009] Both ends of the bottom of the transverse partition are provided with chamfered portions, and the chamfered portions are fitted with the bottom of the groove.

[0010] The cross section of the block is trapezoidal, and its height increases gradually from the inside to the outside.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The composite box girder structure in the utility model can be assembled quickly. The U-shaped steel beam is matched with the top plate and the cross partition, and the height of the obtained composite box girder is smaller than that of the traditional prestressed concrete beam. The assembled composite box girder can be prefabricated in the factory, which is conducive to standardized production and reliable quality. It can be transported to the site in batches for assembly and hoisting, and the construction speed is fast, which greatly improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model.

[0014] In the figure: 1, top plate; 1-1, slide groove; 2, cross partition; 2-1, handle part; 2-2, clamping block; 2-3, chamfered part; 3, U-shaped steel beam; 3-1, trapezoidal end; 3-2, groove; 3-3, clamping slot. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings:

[0016] As shown in the attached figure of the instruction manual Figure 1 As shown, a quick-assembled composite box girder includes a top plate 1, a transverse partition 2 and a U-shaped steel beam 3, wherein a groove 3-2 is provided inside the U-shaped steel beam 3, and the transverse partition 2 is inserted into the groove 3-2. Blocks 2-2 are provided on both sides of the upper part of the transverse partition 2, and the blocks 2-2 fall into the grooves 3-3 provided on the inner wall of the U-shaped steel beam 3. A slide groove 1-1 is provided on the lower surface of the top plate 1, and the slide groove 1-1 is fixedly connected above the U-shaped steel beam 3 and the transverse partition 2.

[0017] A hand-held portion 2 - 1 is provided above the inner wall of the diaphragm 2 .

[0018] The upper end of the U-shaped steel beam 3 is provided with a trapezoidal end portion 3 - 1 , and the trapezoidal end portion 3 - 1 is clamped with the slide groove 1 - 1 .

[0019] Chamfered portions 2-3 are provided at both ends of the bottom of the transverse partition 2, and the chamfered portions 2-3 are fitted with the bottom of the groove 3-2.

[0020] The cross section of the block 2 - 2 is trapezoidal, and its height gradually increases from the inside to the outside.

[0021] Example 1

[0022] A quick-assembled combined box girder comprises a top plate 1, a diaphragm 2 and a U-shaped steel beam 3, wherein a groove 3-2 is provided inside the U-shaped steel beam 3, the diaphragm 2 is inserted into the groove 3-2, blocks 2-2 are provided on both sides of the upper part of the diaphragm 2, the blocks 2-2 fall into the grooves 3-3 provided on the inner wall of the U-shaped steel beam 3, a slide groove 1-1 is provided on the lower surface of the top plate 1, and the slide groove 1-1 is fixedly connected above the U-shaped steel beam 3 and the diaphragm 2.

[0023] A hand-held portion 2 - 1 is provided above the inner wall of the diaphragm 2 .

[0024] The upper end of the U-shaped steel beam 3 is provided with a trapezoidal end portion 3 - 1 , and the trapezoidal end portion 3 - 1 is clamped with the slide groove 1 - 1 .

[0025] Chamfered portions 2-3 are provided at both ends of the bottom of the transverse partition 2, and the chamfered portions 2-3 are fitted with the bottom of the groove 3-2.

[0026] The cross section of the block 2 - 2 is trapezoidal, and its height gradually increases from the inside to the outside.

[0027] In this embodiment, the diaphragm 2 is inserted into the U-shaped steel beam 3. After the diaphragm 2 is inserted, it is welded to the U-shaped steel beam 3. The setting of the diaphragm 2 can increase the strength of the U-shaped steel beam 3. Blocks 2-2 are provided on both sides of the upper part of the diaphragm 2. The block 2-2 falls into the slot 3-3 opened on the inner wall of the U-shaped steel beam 3. The fixing strength of the diaphragm 2 is further increased through the clamping structure.

[0028] Chamfered portions 2 - 3 are provided at both ends of the bottom of the transverse partition 2 , and the chamfered portions 2 - 3 fit with the bottom of the groove 3 - 2 . The chamfered portion design can prevent the transverse partition from being damaged when inserted into the U-shaped steel beam 3 .

[0029] The composite box girder structure in the utility model can be assembled quickly. The U-shaped steel beam is matched with the top plate and the cross partition, and the height of the obtained composite box girder is smaller than that of the traditional prestressed concrete beam. The assembled composite box girder can be prefabricated in the factory, which is conducive to standardized production and reliable quality. It can be transported to the site in batches for assembly and hoisting, and the construction speed is fast, which greatly improves the construction efficiency.

[0030] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications to the shapes, structures, features and spirits described in the claims of the present invention should be included in the claims of the present invention.

Claims

1. A rapidly assembled composite box girder, characterized in that: The invention comprises a top plate (1), a transverse partition (2) and a U-shaped steel beam (3), wherein a groove (3-2) is provided inside the U-shaped steel beam (3), the transverse partition (2) is inserted into the groove (3-2), blocks (2-2) are provided on both sides of the upper part of the transverse partition (2), the blocks (2-2) fall into the grooves (3-3) provided on the inner wall of the U-shaped steel beam (3), and a slide groove (1-1) is provided on the lower surface of the top plate (1), and the slide groove (1-1) is fixedly connected above the U-shaped steel beam (3) and the transverse partition (2).

2. The fast-assembly composite box girder according to claim 1, characterized in that: A hand-holding portion (2-1) is provided above the inner wall of the transverse partition (2).

3. The fast-assembly composite box girder according to claim 1, characterized in that: The upper end of the U-shaped steel beam (3) is provided with a trapezoidal end portion (3-1), and the trapezoidal end portion (3-1) is clamped with the slide groove (1-1).

4. The fast-assembly composite box girder according to claim 1, characterized in that: Chamfered portions (2-3) are provided at both ends of the bottom of the transverse partition (2), and the chamfered portions (2-3) are fitted with the bottom of the groove (3-2).

5. The fast-assembly composite box girder according to claim 1, characterized in that: The cross section of the block (2-2) is trapezoidal, and its height gradually increases from the inside to the outside.

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