CN211922288U - Grouting sleeve connection prefabricated reinforced concrete central crash guardrail - Google Patents

Abstract

The utility model discloses a grouting sleeve connection assembly type reinforced concrete central anti-collision guardrail, which comprises a connecting steel bar, a guardrail main body, a corrugated pipe and an embedded block prefabricated on a girder bridge deck plate, wherein the bottom of the guardrail main body is provided with an embedded groove matched with the embedded block, and the embedded block is embedded into the embedded groove; the two sides of the guardrail main body are provided with mutually symmetrical anti-collision surfaces, the corrugated pipe is arranged in the middle of the guardrail main body and is communicated with the lower end and the upper end of the guardrail main body, and the corrugated pipe is positioned right above the embedded groove; the connecting reinforcement includes extension section and pre-buried section in the girder decking, extension section and embedded section integrated into one piece, just the upper end of extension section stretches into in the bellows after passing girder decking and embedded piece in proper order, the bellows intussuseption is full of the grout material. The utility model discloses a connected mode is firm reliable, and stability is high, and difficult emergence is toppled.

Description

Grouting sleeve connection prefabricated reinforced concrete central crash guardrail

technical field

The utility model relates to guardrail technology, in particular to a grouting sleeve connected assembled reinforced concrete central anti-collision guardrail.

Background technique

Setting up anti-collision guardrails is the most effective protective measure to ensure the safety of bridge traffic. At the same time, anti-collision guardrails are an important part of bridges. Traditional reinforced concrete guardrails often use on-site steel bar binding, concrete cast-in-place construction, and a large number of steel bar transportation. , The processing operation is time-consuming and labor-intensive, which increases the construction period and cost, and the construction quality is difficult to control. Durability, and the pollution caused by on-site pouring is relatively large, which does not meet the requirements of national green building development.

The use of prefabricated central anti-collision guardrail can well solve the drawbacks brought by the cast-in-place anti-collision guardrail to bridge construction. However, the core problem of prefabricated structures is poor integrity. When the prefabricated central anti-collision guardrail is installed, it is necessary to connect the guardrail and the bridge deck with a suitable connection method. While ensuring the connection strength, it also needs to provide sufficient anti-overturning ability, that is, the connection part needs to provide enough when the vehicle collides with the guardrail. The strength and stiffness can also facilitate workers to quickly install during construction.

At present, the vertical connection form of the prefabricated central anti-collision guardrail mainly includes the embedded foundation ("Safety Analysis of the Central Separation Concrete Guardrail of the Bridge Embedded Foundation" Zhang Menzhe, Urban Road Bridges and Flood Control, 2018). The guardrail is embedded between the flange plates, and both sides of the bottom are embedded through the bridge flange plates. This embedded guardrail has poor connection strength in practical applications, and is prone to overall overturning under the impact load of the vehicle, and is not suitable for integral main beams.

Utility model content

The purpose of the utility model is to provide a grouting sleeve connected assembled reinforced concrete central anti-collision guardrail in order to overcome the above shortcomings of the prior art. The grouting sleeve is connected to the assembled reinforced concrete central anti-collision guardrail with reliable connection and high stability.

The purpose of the utility model is achieved through the following technical solutions: the grouting sleeve is connected to the assembled reinforced concrete central anti-collision guardrail, including connecting steel bars, the main body of the guardrail, the corrugated pipe and the embedded block prefabricated on the main girder bridge deck. The bottom of the guardrail body is provided with an embedded groove matched with the embedded block, and the embedded block is embedded in the embedded groove; the two sides of the guardrail body are provided with mutually symmetrical anti-collision surfaces, and the bellows is arranged on the guardrail body. In the middle, the corrugated pipe is connected to the lower end and the upper end of the main body of the guardrail, and the corrugated pipe is located directly above the embedding groove; The section and the buried section are integrally formed, and the upper end of the extension section passes through the main girder bridge deck and the embedded block in sequence and then extends into the corrugated pipe, and the corrugated pipe is filled with grouting material.

Preferably, the number of the corrugated pipes is multiple, and the multiple corrugated pipes are evenly distributed along the axial direction of the embedding groove; After the prefabricated blocks of the crash guardrail are hoisted, they are inserted into the corresponding corrugated pipes.

Preferably, the embedded section is bent at a certain angle relative to the extension section.

Preferably, an epoxy resin adhesive layer is provided between the guardrail main body and the main girder deck.

Preferably, the height at which the upper end of the extension section protrudes from the deck of the main girder is 600mm-1000mm.

Preferably, the depth of the buried section buried in the main girder deck is 60mm-150mm, and the length of the buried section is 200mm-400mm.

Preferably, the cross section of the embedded block is rectangular or square.

Compared with the prior art, the utility model has the following advantages:

1. This grouting sleeve-connected assembled reinforced concrete central anti-collision guardrail is mainly composed of connecting steel bars, guardrail main body, corrugated pipe and embedded solid block (embedded solid system). The collision surface can bear the impact load of the vehicle from the left and right main beams), and the bottom of the guardrail body is provided with an embedded groove that matches the embedded block. In addition to the embedded connection between the embedded grooves, the main body of the guardrail and the bridge deck of the main girder are also strengthened by connecting steel bars and corrugated pipes, so the connection between the main body of the guardrail and the deck of the main girder is firm and reliable. The embedded connection and the reinforced connection are effectively combined to form a whole between the guardrail main body and the main girder deck, and the guardrail main body is a symmetrical structure, which has excellent stability and is not easy to overturn as a whole.

2. The grouting sleeve-connected assembled reinforced concrete central anti-collision guardrail is hoisted and connected to the connecting steel bars through corrugated pipes during construction, and the butting accuracy can be controlled by changing the diameter of the corrugated pipe sleeve, which is convenient to control the butting accuracy; and After the hoisting is completed, the grouting material is directly injected into the corrugated pipe, which is convenient for construction and has a high degree of assembly.

3. The grouting sleeve connected assembled reinforced concrete central anti-collision guardrail adopts connecting steel bars, corrugated pipes and grouting materials to strengthen the connection, which is not only convenient for construction, but also uses simple and cheap engineering materials, which reduces the construction cost.

4. The embedded groove of the grouting sleeve connecting the assembled reinforced concrete central anti-collision guardrail is filled with epoxy resin glue, which can not only ensure the connection strength between the guardrail prefabricated block and the main beam, but also effectively compensate for the prefabrication of the embedded solid system. construction errors.

Description of drawings

FIG. 1 is a schematic structural diagram of a grouting sleeve connected to an assembled reinforced concrete central anti-collision guardrail of the present invention.

FIG. 2 is a schematic diagram of the prefabricated construction structure of the grouting sleeve connected to the assembled reinforced concrete central anti-collision guardrail of the present invention.

FIG. 3 is a schematic structural diagram of the guardrail main body of the present invention.

Fig. 4 is a front view of the grouting sleeve connected assembled reinforced concrete central anti-collision guardrail of the present invention.

Among them, 1 is the main body of the guardrail, 2 is the connecting steel bar, 3 is the corrugated pipe, 4 is the embedded block, 5 is the embedded groove, 6 is the anti-collision surface, 7 is the extension section, 8 is the buried section, and 9 is the grouting material , 10 is the main beam bridge deck, 11 is the epoxy resin adhesive layer.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 3, the grouting sleeve is connected to the prefabricated reinforced concrete central crash guardrail, including connecting steel bars, a guardrail main body, a corrugated pipe and an embedded block prefabricated on the main girder deck. The bottom of the guardrail main body There is an embedding groove matching the embedding block, and the embedding block is embedded in the embedding groove; the two sides of the guardrail main body are provided with mutually symmetrical anti-collision surfaces, and the bellows is arranged in the middle of the guardrail main body. The corrugated pipe is connected to the lower end and the upper end of the main body of the guardrail, and the corrugated pipe is located directly above the embedding groove; the connecting steel bar includes an extension section and an inner buried section pre-buried in the main girder deck, the extension section and the inner buried section are The segment is integrally formed, and the upper end of the extended segment passes through the main girder bridge deck and the embedded block in sequence and then extends into the corrugated pipe, and the corrugated pipe is filled with grouting material.

Specifically, in this embodiment, the main body of the guardrail adopts the length of a standard section, and the length is 6m. The main body of the guardrail is mainly composed of concrete, flexural steel bars and structural steel bars, that is, the concrete forms the shape structure of the main body of the guardrail, and the longitudinal steel bars and the flexural steel bars are arranged in the concrete to improve the strength (the steel skeleton of the prefabricated block of the prefabricated crash guardrail is formed, and withstand external loads when the concrete cracks). The corrugated pipe connects the upper and lower ends of the guardrail body, so when the guardrail main body is hoisted, the corrugated pipe and the connecting steel bars can be easily butted, and after the hoisting is completed, the grouting material can be quickly injected into the corrugated pipe to complete and strengthen the prefabricated block of the anti-collision guardrail. Connections between main beams. The bellows is arranged just above the embedding groove, that is, the axis of the bellows and the middle plane of the embedding groove are located on the same vertical plane. At the same time, in this embodiment, the main body of the guardrail is a symmetrical structure, and the main body of the guardrail is composed of an isosceles trapezoid cross section from top to bottom, a transition section with an isosceles trapezoid section, and a rectangular bottom section. The main body of the guardrail formed by the part, the transition part and the bottom is symmetrical on the left and right, and the corrugated pipe and the embedding groove are located in the middle line of the main body of the guardrail. The embedded connection method formed by the block has good mechanical properties, and the embedded connection formed by the embedded groove and the embedded block can be effectively combined with the reinforced connection formed by the corrugated pipe, the connecting steel bar and the grouting material to ensure the overall guardrail. stability, so that it is not easy to overturn. In order to further improve the pullout resistance and the anti-overturning strength, the connecting steel bars in this implementation are ribbed steel bars with a diameter of 16 mm or more. The mechanical engagement between the thread on the ribbed steel bar and the concrete has the anti-pulling performance, which increases the anti-overturning strength and connection strength to a certain extent.

As shown in Figure 4, there are multiple corrugated pipes, and the multiple corrugated pipes are evenly distributed along the axial direction of the embedding groove; The extension is inserted into the corresponding bellows. The diameter of the corrugated pipe and the connecting steel bars can be adjusted according to the anti-collision level of the guardrail and the requirements of construction accuracy. In this embodiment, the distance between the axes of two adjacent corrugated pipes is 700mm, the plurality of corrugated pipes are evenly arranged along the length of the guardrail main body, and each corrugated pipe is inserted by the extension of the corresponding connecting steel bar. The number of corrugated pipes can be determined according to factors such as the length of the guardrail body and the installation environment, as well as the anti-collision level of the guardrail, so as to further improve the connection strength between the guardrail body and the main girder deck.

The embedded section is bent at a certain angle relative to the extension section. Specifically, the extension section is perpendicular to the deck of the main girder, and when the buried section is bent relative to the extension section, the connection strength between the guardrail main body and the deck of the main girder can be further strengthened to better withstand the impact of vehicle impacts. impact load. In this embodiment, the angle between the buried section and the extension section is 90°, that is, the buried section is set horizontally.

An epoxy resin adhesive layer is arranged between the guardrail main body and the main girder bridge deck. The epoxy resin layer can further improve the connection strength between the main body of the guardrail and the main girder deck, and improve the overall stability, thereby reducing the risk of overturning, and making up for the errors caused by the construction during prefabrication, ensuring the solid state of the embedded system. normal connection.

The height of the upper end of the extension section protruding from the main girder bridge deck is 600mm-1000mm. In this embodiment, the height of the upper end of the extension section protruding from the main girder deck is 800mm, which adopts an extension section of an appropriate length, which ensures the connection strength and saves the reinforcement material to the greatest extent while ensuring the connection strength.

The depth of the buried section buried in the main girder deck is 60mm-150mm, and the length of the buried section is 200mm-400mm. In this embodiment, the depth of the buried section buried in the deck of the main girder is 100mm, and the length of the buried section is 300mm. This appropriate depth and length have a certain pullout resistance, ensure the connection strength, and also It saves steel materials and facilitates construction.

The cross section of the embedded block is rectangular or square. The cross-section of the embedded block is set in a square shape, which improves the force performance of the guardrail body when it is hit, effectively withstands the horizontal impact force brought by the vehicle hitting the guardrail, and further ensures that the guardrail body is not prone to overturning.

The above-mentioned specific embodiments are preferred embodiments of the present invention, and cannot limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solutions of the present invention are included in the present invention. within the scope of the new protection.

Claims (7)

1. The grouting sleeve is connected to the assembled reinforced concrete central anti-collision guardrail, and it is characterized in that: it includes connecting steel bars, guardrail main body, corrugated pipe and an embedded block prefabricated on the main girder deck, and the bottom of the guardrail main body is provided with an embedded block. The fixing block is matched with the embedding groove, and the embedding block is embedded in the embedding groove; the two sides of the guardrail main body are provided with mutually symmetrical anti-collision surfaces, the corrugated pipe is arranged in the middle of the guardrail main body, and the corrugated The pipe connects the lower end and the upper end of the main body of the guardrail, and the corrugated pipe is located directly above the embedding groove; the connecting steel bar includes an extension section and an inner buried section pre-buried in the main girder deck, and the extension section and the inner buried section are integrally formed. , and the upper end of the extension section extends into the corrugated pipe after passing through the main girder bridge deck and the embedded block in sequence, and the corrugated pipe is filled with grouting material. 2. The grouting sleeve connection type reinforced concrete central anti-collision guardrail according to claim 1 is characterized in that: the corrugated pipes are multiple, and the multiple corrugated pipes are evenly distributed along the axial direction of the embedding groove; The number of the connecting steel bars is equal to the numerical model of the corrugated pipe, and the extension of each connecting steel bar is inserted into the corresponding corrugated pipe. 3 . The grouting sleeve-connected assembled reinforced concrete central crash guardrail according to claim 1 , wherein the embedded section is bent at a certain angle relative to the extension section. 4 . 4 . The grouting sleeve-connected assembled reinforced concrete central anti-collision guardrail according to claim 1 , wherein an epoxy resin adhesive layer is provided between the guardrail main body and the main girder bridge deck. 5 . 5 . The grouting sleeve-connected assembled reinforced concrete central anti-collision guardrail according to claim 1 , wherein the upper end of the extension section protrudes from the main girder deck at a height of 600 mm to 1000 mm. 6 . 6. The grouting sleeve-connected assembled reinforced concrete central anti-collision guardrail according to claim 1, wherein the depth of the buried section buried in the main girder deck is 60mm-150mm, and the depth of the buried section is 60mm-150mm. The length is 200mm to 400mm. 7 . The grouting sleeve-connected assembled reinforced concrete central anti-collision guardrail according to claim 1 , wherein the cross-section of the embedded block is rectangular or square. 8 .

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