CN114277658A - Novel structure adopting assembled transverse multi-piece small box girder - Google Patents
Novel structure adopting assembled transverse multi-piece small box girder Download PDFInfo
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- CN114277658A CN114277658A CN202210074078.2A CN202210074078A CN114277658A CN 114277658 A CN114277658 A CN 114277658A CN 202210074078 A CN202210074078 A CN 202210074078A CN 114277658 A CN114277658 A CN 114277658A
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Abstract
The invention discloses a novel structure adopting an assembled transverse multi-piece small box girder, which comprises two or more small box girders arranged side by side, wherein a beam top precast slab is arranged at the top of each small box girder, and an inter-girder precast slab is arranged between every two adjacent small box girders; the small box girder can reduce the erection weight and enhance the transverse connection strength; the small box girder, the beam top precast slabs and the beam inter-precast slabs are fixedly connected through embedded steel bolts, filler cementation is further arranged among the small box girder, the beam top precast slabs and the beam inter-precast slabs, and a shear key structure is arranged at the top of the small box girder; the beam top precast slabs, the beam inter-precast slabs and the small box girder top are provided with a bridge deck cast-in-place layer, and the shear key structure is pre-embedded in the small box girder top and extends into the bridge deck cast-in-place layer. Compared with the prior art, the invention has the advantages that: the structure is clear, construction is convenient, the stability and safety of small box girder construction can be improved, the influence on the electrified railway, the highway or the structure is reduced, and the blocking and control time of the railway or the highway is greatly shortened.
Description
Technical Field
The invention relates to the technical field of fabricated concrete engineering, in particular to a novel structure adopting a plurality of fabricated transverse small box girders.
Background
When a road or a road crosses a railway, a highway or other structures in a bridge form, the conventional structure generally adopts prefabricated assembled small box girders and T girders. Compared with a T-beam structure, the small box beam structure has better self stability, and a small box beam structure is adopted in a crossing railway.
When the wet seam is poured to the small box girder bridge above the electrified railway, the highway or the structure, there is the risk that the concrete slurry, aggregate and even the relevant parts such as template drop, if pound railway contact net and train or highway and car, will cause major accident, and the safety risk is big, therefore protective measures need be done in the small box girder bridge construction operation, and the protection mode among the prior art has two kinds: the first way is to set up a protective shed frame and then lay an insulating plate (electricity-proof plate) on the shed frame for preventing high-voltage breakdown for isolation, and the protection way is to solve the problem of object falling above the electrified railway by adopting a physical isolation way under the conditions that no shielding exists above the electrified railway and the road and shed frame foundations are set up on two sides. The protection mode has certain limitation, and particularly, the problem that objects falling from the upper part cannot be completely isolated above the electrified railway is solved; and the protective shed frame has higher requirement on space, and partial projects are difficult to meet the shed frame erection condition. The second way is to operate at a railway lock point or during traffic control, but this way has a great impact on transportation and traffic.
The operation above the railway or the highway needs to apply for locking points and traffic control to railway and road departments, the resources of the railway locking and skylight points are limited, only 2-4 locking points are needed every week, and the single-point time is generally not more than 2 hours. The conventional construction scheme of the wet joint is generally in-situ pouring, a large amount of time is consumed for performing work such as reinforcement binding, welding, film erecting, pouring, maintenance and the like, the required on-line operation time is long, the construction period is increased by several times or even dozens of times compared with that of a non-railway and road span, and the progress of the whole project is delayed; and has a greater safety risk for transportation.
Therefore, a new structure using an assembled transverse multi-piece box girder is in urgent need of research.
Disclosure of Invention
The invention aims to solve the problems mentioned in the background technology and provide a novel structure adopting an assembled transverse multi-piece small box girder.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a novel structure adopting a plurality of assembled transverse small box girders comprises two or more small box girders arranged side by side, wherein a girder top precast slab is arranged at the top of each small box girder, and an inter-girder precast slab is arranged between every two adjacent small box girders;
the small box girder can reduce the erection weight and enhance the transverse connection strength;
the small box girder, the beam top precast slabs and the beam inter-precast slabs are fixedly connected through embedded steel bolts, filler cementation is further arranged among the small box girder, the beam top precast slabs and the beam inter-precast slabs, and a shear key structure is arranged at the top of the small box girder;
the beam top precast slabs, the beam inter-precast slabs and the small box girder top are provided with a bridge deck cast-in-place layer, and the shear key structure is pre-embedded in the small box girder top and extends into the bridge deck cast-in-place layer.
As a preferred scheme, the small box girder is a precast girder and is made of one of a common reinforced prestressed concrete girder and a high-performance reinforced prestressed concrete girder.
Preferably, the beam top precast slabs and the beam intermediate precast slabs have longitudinal lengths of 1m or 2m, joints are cemented by using a filler, and the filler is one of epoxy resin and elastic adhesive material.
As a preferable scheme, the beam top precast slabs and the beam intermediate precast slabs are steel plates, and the thickness of each steel plate is 0.5-3 cm.
As a preferable scheme, the beam top precast slab and the beam intermediate precast slab are common concrete slabs, and the thickness is 3 cm-10 cm.
As a preferable scheme, the beam top precast slabs and the beam intermediate precast slabs are ultra-high performance concrete slabs, and the thickness of the ultra-high performance concrete slabs is 3 cm-4 cm.
As a preferable scheme, the beam top precast slabs and the beam intermediate precast slabs are composite plates, and the thickness of each composite plate is 2-18 cm.
Preferably, the shear key structure is one of a PBL shear key and a stud.
Compared with the prior art, the invention has the advantages that: the structure is clear, construction is convenient, the stability and safety of small box girder construction can be improved, the influence on the electrified railway, the highway or the structure is reduced, and the blocking and control time of the railway or the highway is greatly shortened.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a partially enlarged view of a in fig. 1 according to the present invention.
As shown in the figure: 1. the method comprises the following steps of small box girder 2, girder top precast slabs 3, beam-to-beam precast slabs 4, embedded steel bolts 5, shear key structures 6 and bridge floor cast-in-place layers.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the resulting manner or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or point connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
A small box girder with an assembled novel structure comprises two or more small box girders 1 arranged side by side, wherein a beam top precast slab 2 is arranged at the top of each small box girder 1, and an inter-girder precast slab 3 is arranged between every two adjacent small box girders 1;
the small box girder 1 is fixedly connected with the girder top precast slabs 2 and the inter-girder precast slabs 3 through pre-buried steel bolts 4, filler cementation is further arranged among the small box girder 1, the girder top precast slabs 2 and the inter-girder precast slabs 3, and the top of the small box girder 1 is provided with a shear key structure 5;
the beam top precast slabs 2, the beam inter precast slabs 3 and the tops of the small box beams 1 are provided with bridge deck cast-in-place layers 6, and the shear key structures 5 are pre-embedded in the tops of the small box beams 1 and extend into the bridge deck cast-in-place layers 6.
The small box girder 1 is a precast girder and is made of common steel bar (prestressed) concrete beams.
The beam top precast slab 2 and the beam space precast slab 3 have the longitudinal length of 1m, the joints are cemented by filling agents, and the filling agents are epoxy resins.
The beam top precast slabs 2 and the beam space precast slabs 3 are steel plates, and the thickness is 0.5 cm-3 cm.
The shear key structure 5 is a stud.
Example 2
A small box girder with an assembled novel structure comprises two or more small box girders 1 arranged side by side, wherein a beam top precast slab 2 is arranged at the top of each small box girder 1, and an inter-girder precast slab 3 is arranged between every two adjacent small box girders 1;
the small box girder 1 is fixedly connected with the girder top precast slabs 2 and the inter-girder precast slabs 3 through pre-buried steel bolts 4, filler cementation is further arranged among the small box girder 1, the girder top precast slabs 2 and the inter-girder precast slabs 3, and the top of the small box girder 1 is provided with a shear key structure 5;
the beam top precast slabs 2, the beam inter precast slabs 3 and the tops of the small box beams 1 are provided with bridge deck cast-in-place layers 6, and the shear key structures 5 are pre-embedded in the tops of the small box beams 1 and extend into the bridge deck cast-in-place layers 6.
The small box girder 1 is a precast girder and is made of a high-performance reinforced (prestressed) concrete beam.
The beam top precast slab 2 and the beam space precast slab 3 have the longitudinal length of 1m, the joints are cemented by filling agents, and the filling agents are epoxy resins.
The beam top precast slabs 2 and the beam space precast slabs 3 are common concrete slabs and have the thickness of 3-10 cm.
The shear key structure 5 is a PBL shear key.
Example 3
A small box girder with an assembled novel structure comprises two or more small box girders 1 arranged side by side, wherein a beam top precast slab 2 is arranged at the top of each small box girder 1, and an inter-girder precast slab 3 is arranged between every two adjacent small box girders 1;
the small box girder 1 is fixedly connected with the girder top precast slabs 2 and the inter-girder precast slabs 3 through pre-buried steel bolts 4, filler cementation is further arranged among the small box girder 1, the girder top precast slabs 2 and the inter-girder precast slabs 3, and the top of the small box girder 1 is provided with a shear key structure 5;
the beam top precast slabs 2, the beam inter precast slabs 3 and the tops of the small box beams 1 are provided with bridge deck cast-in-place layers 6, and the shear key structures 5 are pre-embedded in the tops of the small box beams 1 and extend into the bridge deck cast-in-place layers 6.
The small box girder 1 is a precast girder and is made of a high-performance reinforced (prestressed) concrete beam.
The beam top precast slab 2 and the beam gap precast slab 3 have the longitudinal length of 2m, the joint is cemented by a filling agent, and the filling agent is an elastic bonding material.
The beam top precast slabs 2 and the beam space precast slabs 3 are ultra-high performance concrete slabs and are 3-4cm thick.
The shear key structure 5 is a PBL shear key.
Example 4
A small box girder with an assembled novel structure comprises two or more small box girders 1 arranged side by side, wherein a beam top precast slab 2 is arranged at the top of each small box girder 1, and an inter-girder precast slab 3 is arranged between every two adjacent small box girders 1;
the small box girder 1 is fixedly connected with the girder top precast slabs 2 and the inter-girder precast slabs 3 through pre-buried steel bolts 4, filler cementation is further arranged among the small box girder 1, the girder top precast slabs 2 and the inter-girder precast slabs 3, and the top of the small box girder 1 is provided with a shear key structure 5;
the beam top precast slabs 2, the beam inter precast slabs 3 and the tops of the small box beams 1 are provided with bridge deck cast-in-place layers 6, and the shear key structures 5 are pre-embedded in the tops of the small box beams 1 and extend into the bridge deck cast-in-place layers 6.
The small box girder 1 is a precast girder and is made of common steel bar (prestressed) concrete beams.
The beam top precast slab 2 and the beam gap precast slab 3 have the longitudinal length of 2m, the joint is cemented by a filling agent, and the filling agent is an elastic bonding material.
The beam top precast slab 2 and the beam gap precast slab 3 are composite plates and have the thickness of 2-18 cm.
The shear key structure 5 is a stud.
When the method is implemented specifically, the implementation steps are as follows: erecting small box girders, mounting the girder top precast slabs and the precast slabs between the girders, and constructing a bridge floor cast-in-place layer.
The small box girder is a common reinforced (prestressed) concrete girder or a high-performance reinforced (prestressed) concrete girder, and the high-performance reinforced (prestressed) concrete girder can be thinner and lighter on the premise of ensuring the safety of the structure and is convenient to erect; the durability is better, and the workload of bridge maintenance is reduced, so that the times of applying blockages and control by railway and highway departments are reduced.
The small box girder is divided into an integral prefabrication mode and a segment assembly mode (the small segments are prefabricated, and are assembled on site and erected by using a bridge erecting machine), the length of the segment assembly segment is controlled according to 3m, 5m and 10m, and the segment assembly is prefabricated in an industrial mode.
The small box girder prestress is divided into an internal prestress and an external prestress, and the external prestress can further reduce the structure thickness and the hoisting weight.
The precast slab is a steel plate, a concrete slab or a composite material plate. When the steel plate is used, the thickness range is 0.5-3 cm; when the concrete slab is a concrete slab, the thickness range is 3-10cm, wherein the thickness range of the ultra-high performance concrete slab is 3-4 cm; in the case of composite material plates, the thickness ranges from 2 to 18 cm.
The prefabricated panels may be 1m or 2m long in the longitudinal direction, and the joints are cemented with a filler comprising epoxy resin or other elastic adhesive material.
And the precast slabs and the small box girders are cemented by filling agents.
Steel bolts are pre-buried in the small box girder, bolt holes are reserved when the precast slabs are precast, a filling agent is smeared on the top of the small box girder before the precast slabs are installed, and the bolt holes are filled with concrete after the precast slabs are installed.
The small box girder reserves a shear key structure during prefabrication, and the shear key structure and the bridge deck cast-in-place layer are poured into a whole, so that the integrity of the full bridge is improved.
The shear key structure is PBL shear key, stud and other structures.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides an adopt horizontal multi-disc little case roof beam's of assembled novel structure which characterized in that: the box girder comprises two or more small box girders arranged side by side, wherein a girder top precast slab is arranged at the top of each small box girder, and an inter-girder precast slab is arranged between every two adjacent small box girders;
the small box girder can reduce the erection weight and enhance the transverse connection strength;
the small box girder, the beam top precast slabs and the beam inter-precast slabs are fixedly connected through embedded steel bolts, filler cementation is further arranged among the small box girder, the beam top precast slabs and the beam inter-precast slabs, and a shear key structure is arranged at the top of the small box girder;
the beam top precast slabs, the beam inter-precast slabs and the small box girder top are provided with a bridge deck cast-in-place layer, and the shear key structure is pre-embedded in the small box girder top and extends into the bridge deck cast-in-place layer.
2. The novel structure of assembled transverse multi-piece box girder according to claim 1, characterized in that: the small box girder is a precast girder and is made of one of a common reinforced prestressed concrete girder and a high-performance reinforced prestressed concrete girder.
3. The novel structure of assembled transverse multi-piece box girder according to claim 1, characterized in that: the longitudinal length of the beam top precast slab and the beam precast slab between beams is 1m or 2m, the joint is cemented by a filling agent, and the filling agent is one of epoxy resin and elastic bonding material.
4. The novel structure of assembled transverse multi-piece box girder according to claim 1, characterized in that: the beam top precast slabs and the beam intermediate precast slabs are steel plates, and the thickness of each steel plate is 0.5 cm-3 cm.
5. The novel structure of assembled transverse multi-piece box girder according to claim 1, characterized in that: the beam top precast slab and the beam space precast slab are common concrete slabs, and the thickness of the slab is 3 cm-10 cm.
6. The novel structure of assembled transverse multi-piece box girder according to claim 1, characterized in that: the beam top precast slab and the beam space precast slab are ultra-high performance concrete slabs, and the thickness of the ultra-high performance concrete slabs is 3 cm-4 cm.
7. The novel structure of assembled transverse multi-piece box girder according to claim 1, characterized in that: the beam top precast slab and the beam intermediate precast slab are composite plates, and the thickness of each composite plate is 2-18 cm.
8. The novel structure of assembled transverse multi-piece box girder according to claim 1, characterized in that: the shear key structure is one of a PBL shear key and a stud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074078.2A CN114277658A (en) | 2022-01-21 | 2022-01-21 | Novel structure adopting assembled transverse multi-piece small box girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074078.2A CN114277658A (en) | 2022-01-21 | 2022-01-21 | Novel structure adopting assembled transverse multi-piece small box girder |
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| CN114277658A true CN114277658A (en) | 2022-04-05 |
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| CN202210074078.2A Pending CN114277658A (en) | 2022-01-21 | 2022-01-21 | Novel structure adopting assembled transverse multi-piece small box girder |
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- 2022-01-21 CN CN202210074078.2A patent/CN114277658A/en active Pending
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