Superimposed assembly type concrete anti-collision guardrail

Abstract

The utility model discloses an overlapped assembly type concrete anti-collision guardrail, and belongs to the field of road and bridge engineering. The guardrail is composed of two oppositely-arranged prefabricated anti-collision guardrail panels, a main beam bridge deck and the like, various steel bars are pre-embedded in the prefabricated panels, angle steel is pre-embedded on the outer side of the bottom and connected through snake-shaped connecting steel bars, vertical and bottom side stress main bars are welded to the angle steel, the angle steel is welded to a pre-embedded steel plate of the main beam bridge deck, and stiffening ribs are arranged. Compensation shrinkage concrete is poured in gaps between the panels, and reserved pipelines, waterproof steel bar reserved holes and rabbets are further arranged. According to the guardrail, a traditional formwork is replaced by the standardized prefabricated panel, the problems that the formwork is complex to install and prone to slurry leakage are solved, and standardized production of the prefabricated panel is achieved; rigid is enhanced through a reasonable connecting structure, all parts form a whole, meanwhile, it is guaranteed that new concrete and old concrete are tightly combined, water seepage is prevented, the construction efficiency and using performance of the bridge anti-collision guardrail are effectively improved, and the requirement for modern bridge industrial construction is met.

Description

Technical Field

[0001] This utility model relates to the field of road and bridge engineering technology, and in particular to a composite prefabricated concrete crash barrier. Background Technology

[0002] With the rapid development of my country's transportation infrastructure construction, bridge engineering has increasingly higher requirements for construction efficiency, safety performance, and environmental benefits. Traditional cast-in-place bridge crash barriers suffer from several drawbacks, including low overall installation precision of the formwork, cumbersome formwork installation, inconsistent technical levels among construction units in different sections, and inefficiencies in construction efficiency and ease of maintenance. Furthermore, as crash barriers are auxiliary components of the bridge structure, their construction period is often delayed, resulting in short concrete curing cycles, honeycomb-like pitting on the surface after demolding, and inadequate implementation of durable anti-corrosion measures on the outer surface. Additionally, the long construction period, numerous on-site wet operations, and difficulty in quality control make it difficult to meet the demands of modern industrialized bridge construction. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a composite prefabricated concrete crash barrier. It replaces traditional concrete guardrail formwork with standardized prefabricated crash barrier panels, eliminating the need for steel or wooden formwork. The welding of the bottom angle steel of the prefabricated panel to the embedded steel plate of the main beam bridge deck solves the problem of unstable prefabricated formwork and prevents grout leakage at the bottom of the formwork. Simultaneously, the vertical main reinforcement of the prefabricated panel forms a rigid connection with the bridge deck, improving rigidity and strength. The prefabricated panels enable standardized mass production with uniform quality, appearance, and standards, reducing formwork changes due to concrete curing issues, shortening the construction period, and improving construction efficiency.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A composite prefabricated concrete crash barrier includes two prefabricated crash barrier panels arranged opposite each other. Each prefabricated crash barrier panel has horizontally distributed reinforcing bars, vertical main reinforcing bars, and bottom side main reinforcing bars embedded inside. A gap is left between the two prefabricated crash barrier panels, and the two prefabricated crash barrier panels are connected together by prefabricated serpentine connecting reinforcing bars. Angle steel is prefabricated on the outer bottom of each prefabricated crash barrier panel. The bottom side main reinforcing bars are welded to the angle steel, and the bottom of the vertical main reinforcing bars is bent and welded to the angle steel. A steel plate is prefabricated inside the main beam bridge deck, and the angle steel is welded to the prefabricated steel plate.

[0005] Furthermore, it also includes pre-embedded reinforcing bars in the main beam, the bottom of which is embedded in the bridge deck of the main beam, and the exposed part of the pre-embedded reinforcing bars is located in the gap, where shrinkage-compensating concrete is poured.

[0006] Furthermore, a pre-installed pipe is installed within the aforementioned gap.

[0007] Furthermore, each of the prefabricated crash barrier panels has a pre-drilled hole for waterproof concrete reinforcement at its bottom. Furthermore, the angle steel and steel plate are fixedly connected using stiffening ribs.

[0008] Furthermore, both of the aforementioned prefabricated crash barrier panels have tongue-and-groove joints on their top surfaces.

[0009] This utility model has the following beneficial effects:

[0010] (1) By replacing traditional concrete guardrail formwork with standardized prefabricated crash barrier panels, the purpose of eliminating the need for steel or wooden formwork during construction is achieved. Prefabricated panels enable standardized mass production with uniform quality, appearance, and standards, reducing formwork conversions due to concrete curing issues, shortening the construction period, and improving construction efficiency.

[0011] (2) By welding the bottom angle steel of the precast panel to the pre-embedded steel plate of the main beam bridge panel, the problem of the precast template being unstable was solved, and the leakage of grout at the bottom of the template was avoided. At the same time, the vertical main reinforcement of the precast panel is rigidly connected to the bridge panel, which improves the rigidity and strength. The waterproof concrete reinforcement extends into the reserved hole of the precast crash barrier, which can effectively form a whole with the precast crash barrier, the main beam bridge panel and the bridge deck pavement.

[0012] (3) By pre-removing impurities and roughening the surface of the prefabricated guardrail panels and the main beam bridge deck, and applying concrete interface agent, the purpose of effectively bonding the new and old concrete is achieved.

[0013] (4) By setting tongue and groove on the top surface of the precast crash barrier panel, the purpose of preventing water seepage from the cracks of the crash barrier caused by the shrinkage of the cast-in-place concrete is achieved. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the structure of this utility model;

[0015] In the diagram: 1. Precast crash barrier panel; 2. Horizontal reinforcing bars; 3. Vertical main reinforcing bars; 4. Angle steel; 5. Stiffening ribs; 6. Steel plate; 7. Vertical reinforcing bars; 8. Main beam bridge deck; 9. Main reinforcing bars; 10. Connecting reinforcing bars; 11. Shrinkage-compensating concrete; 12. Embedded reinforcing bars in the main beam; 13. Reserved pipes; 14. Concrete interface agent; 15. Bridge deck reinforcing bars; 16. Waterproof concrete reinforcing bars; 17. Asphalt concrete pavement; 18. Waterproof concrete layer; 19. Tongue and groove joint. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1

[0018] Please refer to Figure 1 A composite prefabricated concrete crash barrier includes two prefabricated crash barrier panels 1 arranged opposite each other. The two prefabricated crash barrier panels 1 are prefabricated in the factory using C45 concrete, and the surface is coated with anti-corrosion coating with a net protective layer thickness of not less than 30mm. Each prefabricated crash barrier panel 1 has pre-embedded horizontally distributed steel bars 2, vertical main reinforcing bars 3, and bottom side main reinforcing bars 9. A gap is left between the two prefabricated crash barrier panels 1, and the two prefabricated crash barrier panels 1 are connected together by pre-embedded serpentine connecting steel bars 10. Angle steel 4 is pre-embedded on the outer bottom of each prefabricated crash barrier panel 1. The angle steel 4 is connected to the bottom side main reinforcing bars 9 by double-sided welding. The bottom of the vertical main reinforcing bars 3 is bent and then welded to the angle steel 4 on both sides. If the bending length cannot reach the minimum double-sided welding length of 10d, it needs to be bent further along the length of the angle steel.

[0019] The steel plate 6 is pre-embedded in the main beam bridge deck 8, and vertical reinforcing bars 7 are pre-embedded under the steel plate 6. The vertical reinforcing bars 7 are connected to the bridge deck reinforcing bars 15 pre-embedded in the main beam bridge deck 8. The angle steel 4 is connected to the steel plate 6 by bevel welding. The angle steel 4 and the steel plate 6 are stabilized and stiffened by stiffening ribs 5. The stiffening ribs 5 are connected to the angle steel 4 and the steel plate 6 by fillet welds.

[0020] Two prefabricated crash barrier panels are provided with tongue and groove joints 19 on the top surface. The size of the tongue and groove joints 19 should not be too large, preferably 20cm x 20cm.

[0021] Two prefabricated crash barrier panels 1 have pre-drilled holes for waterproof concrete steel bars 16 at their bottom to ensure that the waterproof concrete steel bars 16 pass through the crash barrier and improve the overall integrity of the crash barrier.

[0022] To ensure a good bond between the precast components and the cast-in-place concrete, the surfaces of the two precast crash barrier panels 1 and the main beam bridge panel 8 are pre-treated by removing impurities, roughening the surface, and applying a concrete interface agent 14.

[0023] This embodiment also includes pre-embedded reinforcing bars 12 in the main beam. The bottom of the pre-embedded reinforcing bars 12 is embedded in the main beam bridge deck 8, and the exposed part of the pre-embedded reinforcing bars 12 is located in the gap between two oppositely arranged prefabricated crash barrier panels 1. A reserved pipe 13 is also arranged in the gap, and then shrinkage-compensating concrete 11 is poured into the gap. After the composite prefabricated concrete crash barrier is fixed, a waterproof concrete layer 18 and an asphalt concrete pavement 17 are laid sequentially on the main beam bridge deck 8.

[0024] The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite prefabricated concrete crash barrier, characterized in that: The system comprises two prefabricated crash barrier panels arranged opposite each other. Each panel has pre-embedded horizontal reinforcing bars, vertical main reinforcing bars, and bottom side main reinforcing bars. A gap exists between the two panels, which are connected by pre-embedded serpentine connecting reinforcing bars. Angle steel is pre-embedded on the outer bottom of each panel, and the bottom side main reinforcing bars are welded to these angle steels. The bottom of the vertical main reinforcing bars is bent and welded to the angle steels. A steel plate is pre-embedded within the main beam bridge deck, and the angle steels are welded to the pre-embedded steel plate.

2. The composite prefabricated concrete crash barrier according to claim 1, characterized in that: It also includes pre-embedded steel bars in the main beam, the bottom of which is pre-embedded in the bridge deck of the main beam, and the exposed part of the pre-embedded steel bars is located in the gap, where shrinkage-compensating concrete is poured.

3. The composite prefabricated concrete crash barrier according to claim 1, characterized in that: A pre-installed pipe is installed in the aforementioned gap.

4. The composite prefabricated concrete crash barrier according to claim 1, characterized in that: Each of the aforementioned prefabricated crash barrier panels has a pre-drilled hole for waterproof concrete reinforcement at its bottom.

5. A composite prefabricated concrete crash barrier according to any one of claims 1-4, characterized in that: The angle steel and the steel plate are fixedly connected by stiffening ribs.

6. A composite prefabricated concrete crash barrier according to claim 5, characterized in that: Both of the aforementioned prefabricated crash barrier panels have tongue and groove joints on their top surfaces.

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