CN210216110U - Box girder bridge is assembled to split type prefabricated segment of pier top crossbeam of encorbelmenting greatly - Google Patents

Abstract

The utility model discloses a box girder bridge is assembled to split type prefabricated segment of pier top crossbeam of encorbelmenting greatly, its characterized in that is along the cross bridge to, and the bridge floor is formed by two or many girder concatenations, the girder adopts prefabricated segment to assemble the box girder, establishes the pier top crossbeam of encorbelmenting greatly at the pier top, and the pier narrows to the size at the cross bridge, and the crossbeam is to forming the structural style of encorbelmenting greatly at the cross bridge, two or many prefabricated segments are assembled the box girder and are connected into whole through the pier top crossbeam of encorbelmenting greatly. The utility model discloses narrow the pier to road center line direction, set up the crossbeam of encorbelmenting greatly simultaneously at the pier top, the girder acts on the crossbeam of encorbelmenting greatly, and this kind of structural style can greatly reduce substructure's area, promotes economic performance.

Description

Box girder bridge is assembled to split type prefabricated segment of pier top crossbeam of encorbelmenting greatly

Technical Field

The utility model belongs to the technical field of bridge structural design technique and specifically relates to a box girder bridge is assembled to split type prefabricated festival section of crossbeam that encorbelments greatly on mound top.

Technical Field

The prefabricated segment assembled box girder bridge structure originates from Europe, and is popularized and applied in developed areas such as America, hong Kong and the like in the early century of the last century. The prefabricated section assembled box girder bridge structure is green and environment-friendly, and has little influence on environment and traffic; the transportation is convenient and the construction speed is high; the landscape effect is good; good durability, low whole life cost and the like.

Although the prefabricated section assembled bridge is applied to highway and rail transit in the past century, on the cross section of the highway and rail transit bridge, a main beam is often positioned right above a pier, and when the width of a bridge deck is large, the pier at the lower part also occupies a large space, so that the waste of space under the bridge is caused. For example, in the existing segmental prefabricated assembled box girder structure, piers are located right below a box girder, and the center lines of the piers are basically aligned with the center line of the box girder structure. When the bridge deck width is great and two or more girders are required to be arranged, two or more piers are required to be arranged transversely correspondingly, and the space under the bridge is occupied by the piers and is difficult to utilize.

The utility model has the following contents:

the utility model aims at providing a box girder construction is assembled to split type prefabricated segment of crossbeam of encorbelmenting greatly in pier top that area is little, the underbridge space is big, prefabricated segment transportation hoist and mount is simple and convenient.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a box girder bridge is assembled to split type prefabricated segment of crossbeam that encorbelments greatly on mound top, its characterized in that is along the crossbridge to, and the bridge floor is formed by two or a plurality of girder concatenations, the girder adopts prefabricated segment to assemble the box girder, establishes the crossbeam that encorbelments greatly on the mound top at the pier top, and the pier narrows down to the size at the crossbridge, and the crossbeam is to forming the structural style of encorbelmenting greatly in the crossbridge, two or a plurality of prefabricated segments are assembled the box girder and are connected into whole through the crossbeam that encorbelments greatly on.

Furthermore, an external prestressed steel beam is arranged inside the prefabricated section assembling box beam and anchored to the pier top large cantilever beam, and the prefabricated section assembling box beam and the large cantilever beam are connected into a whole at the pier top through a cast-in-place wet joint and a longitudinal external prestressed steel beam.

Further, the bridge pier can adopt a single column type, an H type or a vase type bridge pier.

Furthermore, the middle pier large cantilever beam is fixedly connected with the lower pier 2, a support is arranged between the side pier large cantilever beam and the pier 2, the middle pier large cantilever beam is fixedly connected with the pier, the large cantilever structure can be prevented from overturning, measures such as temporary fixing supports in the construction process can be omitted, and construction cost is saved.

Furthermore, the girder adopts prefabricated segment assembly structure, and the crossbeam can adopt prefabricated construction, also can adopt cast-in-place structure, and the pier can adopt prefabricated pier, also can adopt cast-in-place pier.

Furthermore, transverse beam prestress steel beams in the bridge direction are arranged in the pier top large cantilever beam to resist the load of the large cantilever structure.

Further, the beam prestressed steel bundles are close to the top of the pier top large cantilever beam.

Furthermore, an effective space is kept between the beam prestressed steel strand pipeline in the pier top large cantilever beam and the longitudinal external prestressed steel strand anchor lower spiral steel bars, so that the concrete can be filled compactly.

Furthermore, the prestressed steel bundles of the cross beam in the pier top large cantilever cross beam meet the requirement of the minimum protective layer thickness at the position close to the manhole, and the concrete at the manhole is prevented from cracking.

Compared with the prior art, the utility model has the following advantage: the utility model discloses narrow the pier to road center line direction, set up the crossbeam of encorbelmenting greatly simultaneously at the pier top, the girder acts on the crossbeam of encorbelmenting greatly, and this kind of structural style can greatly reduce substructure's area, promotes economic performance. The utility model discloses well horizontal bridge is to only setting up a pier in road central authorities, and pier quantity does not receive bridge floor width or segment case roof beam quantity to influence, and the horizontal occupation space of pier is little, and the space can obtain make full use of under the bridge, and economic benefits is high. The plurality of prefabricated section assembled box girders are connected into a whole through the cross beam, the structural integrity is strong, and the stress performance is good. The split type prefabricated section box girder divides the main girder in the transverse width direction, reduces the size and the weight of the prefabricated section girder, and is convenient to prefabricate, transport and hoist. The beam is connected with the bridge pier in a consolidation mode, a support and a temporary support during construction are not needed, the construction speed is high, and economic benefits are good.

Description of the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is the utility model discloses well big crossbeam and the pier structure schematic diagram of encorbelmenting.

Fig. 3 is the cross-sectional schematic view of the prestressed steel beam of the middle pier top large cantilever beam.

Numbers in the above figures: 1-pier top large cantilever beam, 2-pier, 3-prefabricated segment box girder, 4-external prestressed steel strand and 5-beam prestressed steel strand.

The specific implementation mode is as follows:

in order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further explained below with reference to the following embodiments and accompanying drawings. The following examples are, however, merely preferred and not intended to be exhaustive of the invention. Other embodiments obtained by those skilled in the art without any creative work based on the embodiments belong to the protection scope of the present invention.

In the prior art, the piers are usually located under the main girders, the center lines of the piers are basically aligned with the center line of the box girder structure, when the width of a bridge deck is large and two or more main girders need to be arranged, two or more piers need to be arranged transversely correspondingly, the space under the bridge is occupied by the piers and is difficult to utilize, and the waste of the space under the bridge is caused. The utility model discloses to the split type prefabricated segment of the crossbeam of encorbelmenting greatly of mound top assemble the structural feature and the atress performance of case roof beam, provide a pier top encorbelment crossbeam split type prefabricated segment of the crossbeam that the space is little, prefabricated standardization level is high, the installation is convenient, the appearance is pleasing to the eye and assemble case roof beam structural style.

The utility model discloses a design is drawn close the pier to road center line direction, sets up the crossbeam of encorbelmenting greatly simultaneously at the pier top, and the girder links into whole with the crossbeam of encorbelmenting greatly, and this kind of structural style can greatly reduce substructure's area (land utilization is improved to 72% by 0%), and the space that the left and right sides vacates can be used for setting up ground auxiliary road or do other usage, promotes the economic benefits of structure. The framing prefabricated section assembled box girder is connected into a whole through the cross beam, and has strong structural integrity and good stress performance. Compared with the whole segment prefabrication, the split prefabrication can reduce the manufacturing difficulty, the transportation difficulty and the hoisting difficulty of the prefabricated segments. The middle pier large cantilever beam is connected with the pier in a consolidation mode, a support and a temporary support during construction are not needed, the construction speed is high, and economic benefits are good.

According to different bridge deck widths, the bridge deck of the pier top large cantilever beam prefabricated section assembled box girder bridge is composed of two or more main girders, the main girders adopt prefabricated sections to assemble a box girder 3, the bridge is generally suitable for bridges with bridge widths of 20 m-55 m, an external prestressed steel beam is arranged in the prefabricated section assembled box girder and anchored to the pier top large cantilever beam, and the prefabricated section assembled box girder is connected with the large cantilever beam into a whole through a cast-in-place wet joint and a longitudinal external prestressed steel beam at the pier top. The middle pier large cantilever beam is fixedly connected with the lower pier 2, and a support is arranged between the side pier large cantilever beam and the pier 2. The size of the pier is narrowed in the transverse bridge direction, and the cross beam forms a large cantilever structure in the transverse bridge direction. The beam and the pier can be prefabricated, and cast-in-place construction can also be adopted. The pier can be a single-column type, H-type or vase-type pier.

The pier top large cantilever beam needs to bear other vertical loads such as the self gravity of the structure, the load of a bridge deck automobile and the like, and also needs to bear the longitudinal horizontal force generated by the anchoring of the longitudinal external prestress steel beams of the main beam, and the space stress condition is complex. Meanwhile, the structure of the large cantilever beam is obviously weakened by the manhole and the external prestressed steel beam hole, so that the safety of the large cantilever beam structure is very important.

The stress safety problem of the large cantilever beam is solved by arranging reasonable prestressed steel beams in the large cantilever beam. When the prestressed steel beams are arranged, the stress of the large cantilever beam needs to be considered, and holes in the beam must be avoided. The design of the beam prestressed steel strand follows the following basic principle: 1. starting from the stress characteristic of the cantilever structure, the beam prestressed steel beam should be close to the top as much as possible; 2. when the beam prestressed steel strand avoids the longitudinal external prestressed steel strand, a proper distance needs to be kept between the beam prestressed steel strand pipeline and the helical reinforcement under the longitudinal external prestressed steel strand anchor to ensure that concrete can be filled compactly; 3. the prestressed steel beam of the cross beam needs to meet the requirement of the minimum protective layer thickness at the position close to the manhole, and meanwhile, the concrete at the manhole is prevented from cracking.

A continuous rigid frame structure system with middle piers consolidated and side piers provided with supports is adopted, the middle piers are not provided with the supports, and 50% of the supports are saved; the middle pier does not need to be temporarily consolidated during construction, the work efficiency is improved by 10 percent, the support does not need to be replaced during operation and maintenance, the construction cost is directly reduced by 1 percent, and the construction cost is reduced by about 4 percent in the whole life cycle.

Compared with a whole-width prefabricated section beam, the pier top large cantilever beam amplitude prefabricated section beam has similar structural stress performance, the prefabrication difficulty of the pier top large cantilever beam amplitude prefabricated section beam is reduced by half, and the work efficiency is improved by 50%; the transportation hoisting weight and the assembly weight are reduced by 50 percent, and the work efficiency is improved by 20 percent; the construction cost is saved by 10 percent; the construction efficiency of assembling the prefabricated sections is greatly improved, and the construction cost is saved.

By adopting the external prestressed steel beams, the bridge girder erection machine can be moved forward to the next span construction by only tensioning the external prestressed steel beams after the assembly of the span sections is completed and before the frame is dropped, the labor-saving period of each span is 1.5 days, and the work efficiency is improved by 30 percent.

The pier top large cantilever beam prefabricated section assembled box girder bridge is formed by splicing a plurality of prefabricated section box girders 3 and is generally suitable for bridges with the bridge width of 20-55 m, and two or more prefabricated section box girders 3 are connected into a whole through the pier top large cantilever beam 1; the pier top large cantilever beam 1 is fixedly connected with the pier 2. An external prestressed steel beam 4 is arranged inside the prefabricated section box girder 3, and the external prestressed steel beam 4 is anchored on the pier top large cantilever beam 1. And a beam prestressed steel strand 5 is arranged in the pier top large cantilever beam 1.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The utility model provides a box girder bridge is assembled to split type prefabricated segment of crossbeam that encorbelments greatly on mound top, its characterized in that is along the crossbridge to, and the bridge floor is formed by two or a plurality of girder concatenations, the girder adopts prefabricated segment to assemble the box girder, establishes the crossbeam that encorbelments greatly on the mound top at the pier top, and the pier narrows down to the size at the crossbridge, and the crossbeam is to forming the structural style of encorbelmenting greatly in the crossbridge, two or a plurality of prefabricated segments are assembled the box girder and are connected into whole through the crossbeam that encorbelments greatly on.

2. The split type precast segmental assembled box girder bridge with the pier top and the large cantilever beam as claimed in claim 1, wherein an external prestressed steel bundle is arranged inside the precast segmental assembled box girder and anchored to the pier top and the large cantilever beam, and the precast segmental assembled box girder and the large cantilever beam are connected into a whole at the pier top through a cast-in-place wet joint and a longitudinal external prestressed steel bundle.

3. The split type prefabricated segment assembled box girder bridge with the pier top and the large cantilever beam as claimed in claim 2, wherein transverse beam prestress steel bundles in the pier top and the large cantilever beam are arranged in the pier top and the large cantilever beam to resist the load of a large cantilever structure.

4. The split type prefabricated segment assembled box girder bridge with the pier top large cantilever beam as claimed in claim 3, wherein the beam prestressed steel strand is close to the top of the pier top large cantilever beam.

5. The split type prefabricated segment assembled box girder bridge with the pier top large cantilever beam is characterized in that an effective distance is kept between a beam prestressed steel strand pipeline in the pier top large cantilever beam and a longitudinal external prestressed steel strand anchoring spiral steel bar so as to ensure that concrete can be filled compactly.

6. The split type prefabricated segment assembled box girder bridge with the pier top large cantilever beam as claimed in claim 1, wherein the middle pier large cantilever beam is fixedly connected with a lower pier, and a support is arranged between the side pier large cantilever beam and the pier.

7. The split type prefabricated segment assembled box girder bridge with the pier top and the large cantilever beam as claimed in claim 1, wherein the pier is a single-column type, H-shaped or vase-shaped pier.

8. The split type prefabricated section assembled box girder bridge with the pier top large cantilever beam as claimed in claim 1, wherein the pier top large cantilever beam is of a prefabricated structure or a cast-in-place structure.

9. The split type prefabricated segment assembled box girder bridge with the pier top and the large cantilever beam as claimed in claim 1, wherein the pier is a prefabricated pier or a cast-in-place pier.

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