CN210916962U

CN210916962U - Segmental precast beam of cantilever assembly bridge and splicing structure thereof

Info

Publication number: CN210916962U
Application number: CN201920780685.4U
Authority: CN
Inventors: 王海良; 郑建
Original assignee: Tianjin Chengjian University
Current assignee: Tianjin Chengjian University
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-07-03
Anticipated expiration: 2029-05-27

Abstract

The utility model discloses a bridge's segmental precast beam is assembled to cantilever and mosaic structure thereof belongs to bridge construction technical field, include along the bridge body that the bridge extended, the beam body has two concatenations and cuts section, its characterized in that: a plurality of convex ribs protruding from the bridge direction are fixed on a splicing section of the beam body, and grooves matched with the positions, the number and the shapes of the convex ribs are arranged on the other splicing section of the beam body. The utility model discloses can effectively improve bridge horizontal load and antitorque ability.

Description

Segmental precast beam of cantilever assembly bridge and splicing structure thereof

Technical Field

The utility model belongs to the technical field of the bridge construction, especially, relate to a bridge is assembled to cantilever festival section precast beam and mosaic structure thereof.

Background

Compared with the traditional construction method of the cast-in-place box girder of the full-bore support, the segment assembling process adopted in the urban overhead construction highlights three advantages of environmental protection, traffic and speed: the construction is noiseless and dustless, and the influence on surrounding residents and the environment is greatly reduced; the construction method has the advantages that no support is needed to be erected on site, no concrete is needed to be poured and pounded on site, and traffic can be opened in construction, so that the pressure on the traffic caused by the construction is greatly reduced; the construction method adopts the module construction, thereby greatly accelerating the site construction speed which is more than one time faster than the traditional construction method. The construction method improves the technological content and the technical level of urban elevated engineering construction, and can greatly reduce the construction cost when being used in a large scale, so that the construction mode is more and more popular with people.

The joint section of the section precast beam is the weakest stress part of the bridge, and in order to ensure that the joint section between adjacent section precast beams has enough vertical shear resistance, the bridge is provided with a shear key at the joint of the precast beams. However, the shear key in the prior art does not consider the action of a transverse bridge loading force applied to the joint and the torsion action generated on the joint when the structure is under the action of an eccentric load, so that the torsion resistance of the bridge is poor, and the overall quality of the bridge is limited.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model provides a solve the cantilever of the poor problem of current segmental prefabrication bridge torsional resistance and assemble the segmental precast beam and the mosaic structure of bridge.

The utility model discloses a realize like this, a bridge's segmental precast beam is assembled to cantilever, include along the bridge body that the bridge extended, the bridge body has two concatenations and cuts section, its characterized in that: a plurality of convex ribs protruding from the bridge direction are fixed on a splicing section of the beam body, and grooves matched with the positions, the number and the shapes of the convex ribs are arranged on the other splicing section of the beam body.

Compared with the prior art, the utility model has the advantages that: the reinforcing structure for enhancing the torsional strength of the stroke of the mutually-inserted convex ribs and grooves at the joint of the two beam bodies can ensure the torsional strength of the splicing part of the segmental beam bridge and can provide the overall strength of the bridge.

In the above technical scheme, preferably, the convex rib has a base, and the base of the convex rib is embedded and fixed in the beam body. The fixing of fin in this scheme can be accomplished at the prefabricated in-process of roof beam body, and it is simple to make, the bridge construction of being convenient for.

In the above technical scheme, preferably, the fin is a cross-shaped structure formed by horizontal rib plates and vertical rib plates, and the groove is a cross-shaped groove with the shape matched with the fin. The convex rib of the structure can enable the torsional strength effect of the bridge to reach the best.

The segment precast beam assembling structure of the cantilever assembling bridge comprises the segment precast beams, beam bodies of the two segment precast beams are in end-to-end butt joint, a convex rib of one beam body is inserted into a groove of the other beam body, and butt joint seams of the two beam bodies are filled with epoxy basalt fiber mortar. The epoxy basalt fiber mortar can fully play the role of steel-concrete combination, and can effectively improve the transverse acting force capability of the bridge bearing bridge.

Drawings

FIG. 1 is a schematic structural diagram of a spliced section of a section precast beam in the present invention;

FIG. 2 is a schematic structural diagram of another splicing section of a segment precast beam in the invention;

FIG. 3 is a schematic structural view of a two-section precast beam;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a sectional view taken along line A-A of FIG. 3;

FIG. 6 is a sectional view taken along line B-B of FIG. 3;

in the figure, 10, a beam body; 20. a rib; 30. and (4) a groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

For solving the poor drawback of current segmental precast bridge torsional resistance, the utility model particularly provides a segmental precast beam and mosaic structure of bridge are assembled to cantilever can effectively improve bridge transverse load and torsional resistance. For further explanation of the structure of the present invention, the following detailed description is made with reference to the accompanying drawings:

referring to fig. 1 to 6, a segmental precast beam for a cantilever erection bridge includes a beam body 10 extended along a bridge and having two spliced sections. The beam body is a reinforced concrete pouring body, the prefabrication processing in a factory building is completed, a plurality of the segmental precast beams are assembled end to end along the bridge direction, the construction of the bridge can be completed, and the bridge direction is the extending direction of the bridge. The splicing section is a front end face and a rear end face of a beam body along the direction of the bridge, namely a joint face spliced with the adjacent section of the precast beam.

A plurality of convex ribs 20 protruding from the bridge direction are fixed on a splicing section of the beam body, and grooves 30 matched with the positions, the number and the shapes of the convex ribs are arranged on the other splicing section of the beam body. And the ribs and the grooves are in one-to-one correspondence and are connected in an inserting manner after the adjacent two sections of precast beams are spliced.

In the above technical scheme, preferably, the convex rib has a base, and the base of the convex rib is embedded and fixed in the beam body. The fin is the cross-shaped structure of section that comprises horizontal floor and vertical floor, the recess be the shape with the cross-shaped groove that the fin matches. In this embodiment, the base and the protruding ribs are integrally welded steel structural members. The convex rib of the structure can enable the torsional strength effect of the bridge to reach the best. The fixing of fin in this scheme can be accomplished at the prefabricated in-process of roof beam body, and it is simple to make, the bridge construction of being convenient for.

The method for bridge construction by adopting the segment precast beam comprises the following steps,

1) and prefabricating the segment precast beam in a factory. Namely, the segment precast beam with standard size is precast in a factory through processes of steel bar weaving, pouring and the like.

2) And transporting the segment precast beams to a construction site, hoisting the segment precast beams and aligning and splicing the convex ribs and the grooves at the splicing surfaces of the two adjacent segments of precast beams.

3) And tensioning the prestressed tendons at the joints of the two sections of precast beams to enable the joints of the two sections of precast beams to be tightly pressed and attached. The tensioning of the prestressed tendons of the two-section precast beam is a known technology of the existing section beam installation construction.

4) And performing epoxy basalt fiber mortar smearing construction at the joint of the two sections of precast beams.

5) And applying pressing force to the joint of the two sections of precast beams again to complete the butt joint of the group of section precast beams. The pressing force is applied by tensioning prestressed thick steel bars arranged between anchor seats in the box.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A segmental precast beam of a cantilever assembly bridge, comprising a beam body extending along the bridge, the beam body having two spliced truncation surfaces, characterized in that: a plurality of convex ribs protruding from the bridge direction are fixed on a splicing section of the beam body, and grooves matched with the positions, the number and the shapes of the convex ribs are arranged on the other splicing section of the beam body.

2. The segmental precast beam of a cantilever erection bridge of claim 1, wherein: the convex rib is provided with a base, and the base of the convex rib is pre-buried and fixed in the beam body.

3. The segmental precast beam of a cantilever erection bridge of claim 1, wherein: the fin is the cross-shaped structure of section that comprises horizontal floor and vertical floor, the recess be the shape with the cross-shaped groove that the fin matches.

4. The utility model provides a bridge is assembled to cantilever segment precast beam assembles structure which characterized in that: the prefabricated beam comprises two sections of prefabricated beams according to any one of claims 1 to 3, wherein beam bodies of the two sections of prefabricated beams are butted end to end, convex ribs of one beam body are inserted into grooves of the other beam body, and the butted joint of the two beam bodies is filled with epoxy basalt fiber mortar.