High-durability concrete anti-collision guardrail for bridge

Abstract

The utility model belongs to the field of bridge engineering, and particularly relates to a high-durability concrete anti-collision guardrail for a bridge, which comprises a U-shaped steel bar, a permanent template and anti-collision guardrail post-pouring concrete, the U-shaped steel bar is pre-buried at the cantilever end of a box girder flange plate, the permanent template is arranged on the U-shaped steel bar at the cantilever end of the box girder flange plate, and the anti-collision guardrail post-pouring concrete is arranged on the permanent template. The anti-collision guardrail post-pouring concrete is poured in the permanent formwork, the permanent formwork is formed by splicing an inner-side UHPC permanent formwork and an outer-side UHPC permanent formwork, the inner-side UHPC permanent formwork and the outer-side UHPC permanent formwork are vertically arranged, vertical steel bars are arranged in the inner-side UHPC permanent formwork and the outer-side UHPC permanent formwork, and the inner-side UHPC permanent formwork and the outer-side UHPC permanent formwork are arranged in the outer-side UHPC permanent formwork. The vertical reinforcing steel bars penetrate through the upper ends and the lower ends of the inner side UHPC permanent formworks and the outer side UHPC permanent formworks and then are bent into upper annular reinforcing steel bars and lower annular reinforcing steel bars respectively. The durability of the anti-collision guardrail can be improved, and the cast-in-place construction speed can be increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bridge engineering field, concretely relates to a high durability concrete crash barrier for bridge. BACKGROUND

[0002] The concrete crash barrier plays a vital role in modern road and bridge construction, which not only provides a physical barrier for vehicles to prevent vehicles from running off the road or bridge, but also greatly ensures the safety of pedestrians and drivers. However, with the increase of use time, the concrete crash barrier will appear a series of durability diseases, and the problem of slow construction speed of site pouring also gradually appears, which poses a challenge to traffic safety and engineering progress.

[0003] As a porous material, concrete is easily affected by various factors when exposed to natural environment for a long time, resulting in its performance degradation. Common durability diseases include steel corrosion, freeze-thaw cycle damage, chemical corrosion, surface wear, design defects or construction quality problems, etc. Compared with precast installation, site pouring concrete crash barrier has the advantages of high flexibility and strong adaptability, but also has the problem of low construction efficiency: tedious preparation work, high weather dependence, equipment resource occupation, complex quality control, etc.

[0004] In summary, solving the durability diseases of the concrete crash barrier and improving the construction speed of site pouring become technical problems that the technical personnel in the field urgently need to overcome. UTILITY MODEL CONTENT

[0005] In view of the problems existing in the prior art, the utility model discloses a high durability concrete crash barrier for bridge, which can pour UHPC permanent formwork in the factory and splice and pour again on site, which not only fully utilizes the material performance advantages of UHPC to improve the durability of the crash barrier, but also improves the construction speed of the bridge concrete crash barrier.

[0006] To achieve the above purpose, the utility model discloses the following scheme:

[0007] The utility model provides a kind of high durability concrete crash barrier for bridge, including U-shaped reinforcement, permanent formwork and crash barrier post-cast concrete, the U-shaped reinforcement is embedded in the cantilever end of box girder flange plate, the permanent formwork is set on the U-shaped reinforcement of the cantilever end of box girder flange plate, the crash barrier post-cast concrete is poured in permanent formwork, the permanent formwork is spliced using inside UHPC permanent formwork, outside UHPC permanent formwork, the inside UHPC permanent formwork, outside UHPC permanent formwork is vertically arranged, inside UHPC permanent formwork, outside UHPC permanent formwork is provided with vertical reinforcement in inside, the vertical reinforcement is bent into upper annular reinforcement and lower annular reinforcement respectively after passing out the upper and lower ends of inside UHPC permanent formwork, outside UHPC permanent formwork.

[0008] Further, the vertical reinforcement is provided with an inside permanent formwork reinforcement mesh in the inside UHPC permanent formwork.

[0009] Further, the vertical reinforcement is provided with an outside permanent formwork reinforcement mesh in the outside UHPC permanent formwork.

[0010] Further, the lower annular reinforcement is staggered with the U-shaped reinforcement.

[0011] Further, the inner surfaces of the inside UHPC permanent formwork and the outside UHPC permanent formwork are provided with concave interface structures for increasing the interface strength between the inside UHPC permanent formwork, the outside UHPC permanent formwork and the crash barrier post-cast concrete.

[0012] Further, it further comprises a box girder top slab post-cast concrete layer, which is poured above the box girder flange plate cantilever for reinforcing the permanent formwork.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] The utility model makes full use of the characteristics of high tensile strength, good toughness and excellent durability of UHPC material, and prefabricates the inside and outside permanent formwork of the crash barrier, configures reinforcement mesh in the inside of the permanent formwork, improves the structural strength of the permanent formwork, designs recessed structure on the contact side of the permanent formwork and ordinary concrete to ensure that the ordinary concrete can enter the recessed area of the permanent formwork after pouring, and form interface shear connection keys; the utility model can not only improve the construction speed of the bridge concrete crash barrier, but also fully utilize the material performance advantages of UHPC to improve the durability of the crash barrier, and the use of UHPC and ordinary concrete can also reduce the construction cost, so the utility model has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1The utility model discloses a main body structure schematic diagram;

[0016] Fig. 2 The utility model discloses inside UHPC permanent formwork and outside UHPC permanent formwork structure schematic diagram;

[0017] Fig. 3 The utility model discloses the assembling process schematic diagram.

[0018] In the drawing, 1-inside UHPC permanent formwork;2-inside permanent formwork steel bar net;3-recess interface structure;4-above annular steel bar;5-lower annular steel bar;6-outside UHPC permanent formwork;7-outside permanent formwork steel bar net;8-U-shaped steel bar;9-box girder flange plate cantilever end;10-box girder roof back-poured concrete layer;11-crash barrier back-poured concrete. Specific embodiments

[0019] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the range of the utility model protection.

[0020] Embodiment 1

[0021] As Figs. 1-3 The utility model discloses a bridge high durability concrete crash barrier discloses a bridge high durability concrete crash barrier, including U-shaped steel bar 8, permanent formwork and crash barrier back-poured concrete 11.

[0022] U-shaped steel bar 8 is embedded in box girder flange plate cantilever end 9, permanent formwork is arranged on U-shaped steel bar 8 of box girder flange plate cantilever end 9, and crash barrier back-poured concrete 11 is poured in permanent formwork, and the permanent formwork in the embodiment is prefabricated and spliced into inside UHPC permanent formwork 1 and outside UHPC permanent formwork 6, specifically, inside UHPC permanent formwork 1 and outside UHPC permanent formwork 6 are vertically arranged, inside UHPC permanent formwork 1 and outside UHPC permanent formwork 6 are provided with vertical steel bars, the vertical steel bars are respectively stretched out a certain length after going out the upper and lower ends of inside UHPC permanent formwork 1 and outside UHPC permanent formwork 6, and the steel bar end is bent into the upper annular steel bar 4 and the lower annular steel bar 5 of semicircular shape, and the upper annular steel bar 4 of inside UHPC permanent formwork 1 and outside UHPC permanent formwork 6 is arranged and welded in the form of interpenetration in the embodiment, and the lower annular steel bar 5 of the two is also arranged and welded in the form of interpenetration.

[0023] As the preferred embodiment of the utility model, the vertical steel bars are provided with the inner permanent formwork steel bar net 2 in the inner side UHPC permanent formwork 1, and the vertical steel bars are provided with the outer permanent formwork steel bar net 7 in the outer side UHPC permanent formwork 6, so that the structural strength of the permanent formwork is increased.

[0024] As the preferred embodiment of the utility model, the lower annular steel bars 5 and the U-shaped steel bars 8 are staggered.

[0025] As the preferred embodiment of the utility model, the inner surfaces of the inner side UHPC permanent formwork 1 and the outer side UHPC permanent formwork 6, which are in contact with the post-cast concrete 11 of the crash barrier, are provided with concave interface structures 3, so that the interface strength between the inner side UHPC permanent formwork 1 and the outer side UHPC permanent formwork 6 and the post-cast concrete 11 of the crash barrier is increased, and the recessed area of the permanent formwork can be entered by the ordinary concrete after pouring, so that the interface shear connection key is formed.

[0026] As the preferred embodiment of the utility model, the utility model also comprises a post-cast concrete layer 10 of a box girder top plate, which is poured above the cantilever of the box girder flange plate and is used for reinforcing the permanent formwork.

[0027] The construction method of the utility model is as follows: the permanent formwork is poured in the factory, and after the UHPC permanent formwork reaches the design strength, the permanent formwork is transported to the construction site, the inner side UHPC permanent formwork 1 and the outer side UHPC permanent formwork 6 are spliced according to the design size, and all the contacting annular steel bars are spot-welded after splicing; then the spliced permanent formwork is installed above the cantilever end 9 of the box girder flange plate, the lower annular steel bars 5 of the permanent formwork are staggered with the embedded U-shaped steel bars 8 of the cantilever end 9 of the box girder flange plate, the post-cast concrete 11 of the crash barrier is poured in the permanent formwork, and the post-cast concrete 11 of the crash barrier is used for force transmission between the lower annular steel bars 5 of the permanent formwork and the embedded U-shaped steel bars 8; finally, the post-cast concrete layer 10 of the box girder top plate above the cantilever of the beam flange plate is used for reinforcing the permanent formwork, and the construction is completed after the crash barrier reaches the design strength.

[0028] The above is only the preferred embodiment of the utility model, and does not limit the technical range of the utility model, so any slight modification, equivalent change and modification made according to the technical essence of the utility model are still within the range of the technical scheme of the utility model.

Claims

1. A high durability concrete crash barrier for bridges, characterized by, The U-shaped steel bar is embedded in the cantilever end of the box girder flange plate, the permanent formwork is arranged on the U-shaped steel bar at the cantilever end of the box girder flange plate, the post-poured concrete of the crash barrier is poured in the permanent formwork, the permanent formwork is spliced by the inner UHPC permanent formwork and the outer UHPC permanent formwork, the inner UHPC permanent formwork and the outer UHPC permanent formwork are vertically arranged, vertical steel bars are arranged in the inner UHPC permanent formwork and the outer UHPC permanent formwork, and the vertical steel bars are bent into upper ring-shaped steel bars and lower ring-shaped steel bars after passing through the upper and lower ends of the inner UHPC permanent formwork and the outer UHPC permanent formwork.

2. The high durability concrete crash barrier for bridges according to claim 1, characterized in that, The vertical steel bars are provided with an inner permanent formwork steel mesh in the inner UHPC permanent formwork.

3. The high durability concrete crash barrier for bridges according to claim 1, characterized in that, The vertical steel bars are provided with an outer permanent formwork steel mesh in the outer UHPC permanent formwork.

4. The high durability concrete crash barrier for bridges according to claim 1, characterized in that, The lower ring-shaped steel bars are staggered with the U-shaped steel bars.

5. The high durability concrete crash barrier for bridges according to claim 1, characterized in that, The inner surfaces of the inner UHPC permanent formwork and the outer UHPC permanent formwork are provided with concave interface structures for increasing the interface strength between the inner UHPC permanent formwork, the outer UHPC permanent formwork and the post-poured concrete of the crash barrier.

6. The high durability concrete crash barrier for bridges according to claim 1, characterized in that, The box girder top plate post-poured concrete layer is further arranged above the box girder flange plate cantilever for reinforcing the permanent formwork.

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