Prefabricated assembly type wide-width box girder

Abstract

The utility model discloses a prefabricated assembly type wide-width box girder which comprises a prefabricated U-shaped beam and a prefabricated top plate, and the length size of the prefabricated U-shaped beam in the first direction is larger than the width size of the prefabricated U-shaped beam in the second direction. A plurality of shear keys are preset at the tops of two side plates of the prefabricated U-shaped beam at equal intervals; the length size of the prefabricated top plate in the first direction is smaller than the width size of the prefabricated top plate in the second direction; the prefabricated top plate is arranged on the prefabricated U-shaped beam in an extending mode in the first direction. As the transverse width of the prefabricated top plate is larger, the length of the prefabricated top plate is set to be shorter, so that the prefabricated top plate can be conveniently transported on urban roads; the transverse width of the prefabricated U-shaped beams is small, so that the prefabricated U-shaped beams are long, and splicing between the prefabricated U-shaped beams is avoided or reduced. Meanwhile, the wet joint bearing parts extending outwards from the end faces are arranged at the bottoms of the two end faces, perpendicular to the first direction, of the prefabricated top plate, during assembling, concrete can be directly poured after splicing, the assembling procedures are reduced, the construction efficiency is improved, and the adverse effect on urban traffic is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge engineering technical field more specifically, relate to a prefabricated assembly type wide box girder. BACKGROUND

[0002] The prefabricated assembly type box girder is more and more widely used in bridge aspect because of its structural strength is high, can assemble and has the advantages such as short construction period, and city bridge is one of them. However, because the bridge deck is wide, the transportation of the prefabricated assembly beam of city bridge can be difficult to transport in city road because of the width limit of road. At the same time, construction on city road also causes great influence to city traffic. Further, the existing prefabricated assembly type wide box girder needs to place the wet joint bottom die in advance to bottom up in the process of assembling, so as to pour concrete when splicing prefabricated roof. In this way, the assembly process is complicated, and the efficiency needs to be improved. SUMMARY

[0003] The utility model provides a prefabricated assembly type wide box girder to solve the technical problem of the existing prefabricated assembly type box girder of transportation difficulty, construction process is complicated, and the assembly efficiency is not high.

[0004] The utility model provides a prefabricated assembly type wide box girder, it includes: prefabricated U type beam and prefabricated roof, the length size of prefabricated U type beam in the first direction is greater than its width size in the second direction, the top of two side plates of prefabricated U type beam is equal interval and is provided with a plurality of shear keys, the length size of prefabricated roof in the first direction is less than its width size in the second direction, prefabricated roof is arranged on prefabricated U type beam along the first direction extension, the position of prefabricated roof corresponding with shear key is provided with shear key hole, and the bottom of two end faces of prefabricated roof perpendicularly to the first direction is provided with the wet joint receiving part that extends from end face to outside.

[0005] Further, the wet joint receiving part is a wet joint bottom die prefabricated fixed on the bottom of the prefabricated roof, and the wet joint bottom die extends along the bottom of two end faces.

[0006] Further, the size of the shear key is less than the size of the shear key hole.

[0007] Further, the shear key vertically extends a plurality of first connecting steels from the top surface.

[0008] Further, a plurality of second connecting steels are arranged in the prefabricated roof along the first direction, and the second connecting steels vertically extend from the two end faces of the prefabricated roof in the first direction.

[0009] Further, the second connecting steel bar extends from the end face by a distance greater than the distance by which the wet joint receiving portion extends from the end face.

[0010] Further, the prefabricated roof panels are at least two, arranged adjacent along the first direction, and the end faces of the two wet joint receiving portions adjacent between the prefabricated roof panels contact each other to form a wet joint space.

[0011] Further, the shape of the shear key and the shear key hole is rectangular, square, L-shaped, trapezoidal or diamond-shaped.

[0012] Further, the prefabricated U-shaped beam and the prefabricated roof panel are made of reactive powder concrete (RPC).

[0013] Compared with the prior art, the prefabricated assembly wide box girder has the following beneficial effects:

[0014] The prefabricated assembly wide box girder has the following beneficial effects: the prefabricated roof panel has a relatively large transverse width, so the length of the prefabricated roof panel is set to be relatively short to facilitate transportation in urban roads; the prefabricated U-shaped beam has a relatively small transverse width, so the length of the prefabricated U-shaped beam is set to be relatively long to avoid or reduce the splicing between the prefabricated U-shaped beams and improve the construction efficiency; meanwhile, the wet joint receiving portions extending outward from the end faces are arranged at the bottom of the two end faces of the prefabricated roof panel perpendicular to the first direction, so that the concrete can be directly poured after splicing during assembly, without the need for additional formwork engineering, thereby reducing the assembly process, improving the construction efficiency, and reducing the adverse impact on urban traffic.

[0015] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0017] Figure 1 is a schematic diagram of the overall structure of the prefabricated assembly wide box girder according to the embodiment of the present application;

[0018] Figure 2 is a top view of the prefabricated U-shaped beam in the prefabricated assembly wide box girder according to the embodiment of the present application;

[0019] Figure 3 is a sectional view of the prefabricated U-shaped beam in the prefabricated assembly wide box girder according to the embodiment of the present application in the first direction;

[0020] Figure 4 is a top view of the prefabricated roof panel in the prefabricated assembly wide box girder according to the embodiment of the present application;

[0021] Figure 5 is a sectional view of the prefabricated roof in the first direction in the prefabricated assembly type wide box girder according to the embodiment of the present utility model; Figure 4

[0022] Figure 6 is a sectional view of the prefabricated roof in the first direction in the prefabricated assembly type wide box girder according to the embodiment of the present utility model;

[0023] Figure 7 is a sectional view of the prefabricated assembly type wide box girder in the first direction after assembly according to the embodiment of the present utility model.

[0024] Reference signs:

[0025] prefabricated U-shaped beam 10; shear key 11; first connecting steel bar 12;

[0026] prefabricated roof 20; shear key hole 21; wet joint receiving part 22; second connecting steel bar 23. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present utility model unless otherwise specifically stated.

[0028] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way limiting to the scope of the present utility model and its applications or uses.

[0029] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus can be considered part of the present utility model.

[0030] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Thus, other examples of the exemplary embodiments can have different values.

[0031] Note that similar reference numerals and letters refer to similar items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0032] ​In the description of the utility model, it needs to be understood that, if the terms "first", "second" are involved, one or more of the features can be explicitly or implicitly included. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the description and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0033] In the description of the utility model, it needs to be understood that, if the terms "first", "second" are involved, one or more of the features can be explicitly or implicitly included. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the description and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0034] In the description of the utility model, it needs to be understood that, if the terms "first", "second" are involved, one or more of the features can be explicitly or implicitly included. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the description and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0035] The prefabricated assembly type wide box girder according to the embodiments of the utility model is described in detail below with reference to the drawings.

[0036] The prefabricated assembly type wide box girder according to the embodiments of the utility model comprises a prefabricated U-shaped beam 10 and a prefabricated top plate 20.

[0037] The prefabricated assembly type wide box girder is divided into the prefabricated U-shaped beam 10 and the prefabricated top plate 20, and the two parts are prefabricated respectively, facilitating transportation, and the prefabricated U-shaped beam 10 and the prefabricated top plate 20 are assembled into the prefabricated assembly type wide box girder at the construction site, which can greatly reduce the construction time on site.

[0038] As Figure 1 , Figure 2As shown, the transverse width of the precast U-shaped beam 10 in the second direction is relatively small. Therefore, its longitudinal length in the first direction can be appropriately increased. That is, the length of the precast U-shaped beam 10 in the first direction is greater than its width in the second direction. By adjusting the length of the precast U-shaped beam 10, it can be adapted to the size of the transport vehicle, facilitating transportation. Furthermore, by increasing the length of the precast U-shaped beam 10, splicing between precast U-shaped beams 10 can be eliminated or reduced, thus accelerating construction efficiency. The specific dimensions can be comprehensively evaluated based on factors such as the design requirements of the box girder and the transportation conditions at the construction site.

[0039] like Figure 1 , Figure 4 As shown, the precast top slab 20 has a larger transverse width in the second direction, so its longitudinal length in the first direction can be set to be shorter; that is, the length of the precast top slab 20 in the first direction is smaller than its width in the second direction. The length of the precast top slab 20 can be adjusted to accommodate the dimensions of the transport vehicle for convenient transportation. The specific dimensions can be comprehensively evaluated based on factors such as the design requirements of the box girder and the transportation conditions at the construction site.

[0040] like Figure 1 As shown, a precast top slab 20 extends along a first direction on the precast U-shaped beam 10, with the bottom surface of the top slab 20 contacting the tops of the two side plates of the precast U-shaped beam 10. Several shear keys 11 are pre-set at equal intervals on the tops of the two side plates of the precast U-shaped beam 10, and shear key holes 21 are formed on the top slab 20 at positions corresponding to the shear keys 11. The shear keys 11 are mainly used to withstand the longitudinal shear force at the interface between the two sides of the precast top slab 20 and the precast U-shaped beam 10, resisting relative slippage between them and ensuring that the precast top slab 20 and the precast U-shaped beam 10 work together. The shear key holes 21 are typically used for pouring concrete to form concrete tenons to resist shear flow. The shear keys 11 and shear key holes 21 provide strong connection and load-bearing capacity, ensuring the integrity and stability of the precast assembled wide-span box girder structure.

[0041] During the splicing of precast top slabs 20, wet joints will form between adjacent splicing areas of each precast top slab 20 in the first direction. The usual practice is to add additional formwork, i.e., to erect a wet joint bottom formwork at the bottom of the precast top slab 20 to support it, and then pour cement to complete the wet joint connection. In the precast assembled wide-width box girder of this utility model embodiment, such as... Figure 4 , Figure 5 As shown, wet joint receiving parts 22 extending outward from the end faces are provided at the bottom of the two end faces of the precast roof slab 20 perpendicular to the first direction. During assembly, after the precast roof slab 20 is spliced, the two adjacent wet joint receiving parts 22 serve as a bottom, and concrete can be poured directly without additional formwork, reducing assembly steps, greatly improving construction efficiency, and thus minimizing the adverse impact on urban traffic.

[0042] The wet joint receiving part 22 can be integrally processed with the prefabricated roof 20, or the wet joint bottom die can be fixed with the prefabricated roof 20 during prefabrication. Preferably, the wet joint bottom die and the prefabricated roof are prefabricated together during prefabrication, and the wet joint bottom die extends along the bottom of the two end faces. In this way, the existing engineering materials can be used to complete the work, saving costs and improving efficiency.

[0043] The prefabricated assembly type wide box girder of the utility model, because the prefabricated roof 20 has a large transverse width, the length thereof is set to be relatively short to facilitate transportation in urban roads; the prefabricated U-shaped beam 10 has a small transverse width, and the length thereof is set to be relatively long to avoid or reduce splicing between the prefabricated U-shaped beams 10 and improve construction efficiency; meanwhile, the wet joint receiving part 22 extending outward from the end face is arranged at the bottom of the two end faces of the prefabricated roof 20 perpendicular to the first direction, and during assembly, concrete can be directly poured after splicing, thereby reducing the assembly process, improving construction efficiency, and reducing the adverse impact on urban traffic.

[0044] The size of the shear key 11 is smaller than the size of the shear key hole 21, facilitating cooperation between the shear key 11 and the shear key hole 21 and accelerating the assembly speed. Figure 2 Figure 3 As shown in the figure, the shear key 11 vertically extends a plurality of first connecting steel bars 12 from the top surface. By arranging the first connecting steel bars 12 on the shear key 11, the load can be effectively transmitted, the shear capacity can be enhanced, the shear force in the horizontal direction can be resisted, and the shear key 11 can be prevented from being damaged.

[0045] As shown in the figure, a plurality of second connecting steel bars 23 are arranged in the prefabricated roof 20 along the first direction, and the second connecting steel bars 23 vertically extend from the two end faces of the prefabricated roof 20 in the first direction. Figure 1 Figure 5 If the concrete is directly poured at the wet joint connection, the tensile strength of the concrete itself is relatively low, which can cause the prefabricated assembly type wide box girder to have a serious lack of tensile capacity at the splicing part of the prefabricated roof, thereby affecting the service life of the prefabricated assembly type wide box girder and even causing a major safety hazard. The second connecting steel bars 23 can play a supporting and reinforcing role to prevent cracks and deformation of the wet joint splicing part under stress, and the supporting and reinforcing role can help maintain the integrity and stability of the concrete structure.

[0046] According to the prefabricated assembly type wide box girder of the utility model embodiment, the shear key 11 of the prefabricated U-shaped beam 10 is inserted into the corresponding shear key hole 21 of the prefabricated roof 20, and then the concrete is poured in the shear key hole 21 to assemble the two into a complete box girder, and the concrete at the shear key hole 21 is poured together with the concrete at the wet joint connection to improve the construction efficiency.

[0047] ​​Preferably, the second connecting steel bars 23 protrude from the end face by a distance greater than the distance by which the wet joint receiving portions 22 protrude from the end face. When the outer ends of two adjacent wet joint receiving portions 22 abut during splicing, the second connecting steel bars 23 on the two adjacent prefabricated roof slabs 20 can be staggered and overlapped, facilitating the lapping between the two adjacent prefabricated roof slabs 20 and further increasing the tensile strength of the spliced wet joint.

[0048] The prefabricated roof slabs 20 are at least two in number and are arranged adjacent to each other along the first direction, and the end faces of the two adjacent wet joint receiving portions 22 between the prefabricated roof slabs 20 abut to form a wet joint space. Figure 1 As shown in the drawings, the prefabricated roof slabs 20 are at least two in number, and one prefabricated U-shaped beam 10 and a plurality of prefabricated roof slabs 20 are spliced together to form a prefabricated assembly wide box girder, which can quickly meet the construction requirements of urban bridges and is efficient and convenient.

[0049] The shape and size of the shear key 11 and the shear key hole 21 can be selected and designed according to actual engineering requirements and load conditions to ensure that the quality and use effect of the shear key 11 meet the requirements, and are preferably rectangular, square, L-shaped, trapezoidal or rhombic.

[0050] The prefabricated U-shaped beam 10 and the prefabricated roof slab 20 are preferably made of reactive powder concrete RPC. The reactive powder concrete RPC is a kind of ultra-high performance concrete UHPC, which has the excellent properties of ultra-high compressive strength, high tensile strength, good toughness, excellent durability, low creep coefficient after thermal curing and no shrinkage after thermal curing. Using RPC bridge deck instead of ordinary concrete to make the combined prefabricated U-shaped beam 10 and prefabricated roof slab 20 can effectively solve the problems of structural fatigue and easy damage of asphalt concrete pavement.

[0051] According to the prefabricated assembly wide box girder of the present application, the prefabricated roof slab 20 has a large transverse width, so its length is set to be relatively short to facilitate transportation in urban roads. The prefabricated U-shaped beam 10 has a small transverse width, so its length is set to be relatively long to avoid or reduce the splicing between the prefabricated U-shaped beams 10 and improve the construction efficiency. At the same time, the wet joint receiving portions 22 extending outward from the end face are arranged at the bottom of the two end faces of the prefabricated roof slab 20 perpendicular to the first direction. During assembly, the concrete can be directly poured after splicing, reducing the assembly process, improving the construction efficiency and reducing the adverse impact on urban traffic.

[0052] Of course, other structures of the prefabricated assembly wide box girder and their working principles can be understood and implemented by those skilled in the art, and will not be described in detail in the present application.

[0053] While specific embodiments of the application have been described in detail, those familiar with the art will appreciate that the examples given are by way of example and are not meant to limit the scope of the application. Those skilled in the art will recognize or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the application described herein. It is therefore intended that the scope of the application be determined by the following claims.

Claims

1. A precast fabricated wide box girder, characterized by, The application relates to a prefabricated U-shaped beam (10) and a prefabricated roof plate (20). The prefabricated U-shaped beam (10) has a length dimension in a first direction greater than a width dimension in a second direction; a plurality of shear keys (11) are equidistantly arranged on the top of two side plates of the prefabricated U-shaped beam (10); The prefabricated roof plate (20) has a length dimension in the first direction smaller than a width dimension in the second direction; the prefabricated roof plate (20) is arranged on the prefabricated U-shaped beam (10) in the first direction; a shear key hole (21) is arranged on the prefabricated roof plate (20) corresponding to the shear key (11); a wet joint receiving part (22) extending outward from the end surface is arranged on the bottom of the two end surfaces of the prefabricated roof plate (20) perpendicular to the first direction.

2. The precast segmental wide box girder according to claim 1, wherein, The wet joint receiving part (22) is a wet joint bottom die fixed on the bottom of the prefabricated roof plate (20), and the wet joint bottom die extends along the bottom of the two end surfaces.

3. The precast segmental wide box girder according to claim 2, wherein, The size of the shear key (11) is smaller than the size of the shear key hole (21).

4. The precast segmental wide box girder according to claim 3, wherein, The shear key (11) vertically extends a plurality of first connecting steel bars (12) from the top surface.

5. The precast segmental wide box girder according to claim 4, wherein, A plurality of second connecting steel bars (23) are arranged in the prefabricated roof plate (20) parallel to the first direction, and the second connecting steel bars (23) vertically extend from the two end surfaces of the prefabricated roof plate (20) in the first direction.

6. The precast segmental wide box girder according to claim 5, wherein, The second connecting steel bars (23) extend from the end surface by a distance greater than the distance by which the wet joint receiving part (22) extends from the end surface.

7. The precast segmental wide box girder according to claim 6, wherein, The prefabricated roof plate (20) is at least two, and the prefabricated roof plates (20) are arranged adjacent to each other in the first direction; the two wet joint receiving parts (22) adjacent to each other between the prefabricated roof plates (20) contact each other to form a wet joint space.

8. The precast segmental wide box girder according to claim 3, wherein, The shapes of the shear key (11) and the shear key hole (21) are rectangular, square, L-shaped, trapezoidal or rhombic.

9. The precast segmental wide box girder according to any one of claims 1-8, wherein, The prefabricated U-shaped beam (10) and the prefabricated roof plate (20) are made of reactive powder concrete (RPC).

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