Quick installation structure of prefabricated guardrail for road and bridge engineering

Abstract

This utility model discloses a rapid installation structure for prefabricated guardrails in road and bridge engineering, solving the installation difficulties of existing quick-installation concrete guardrails and the problem of the bonding strength between the guardrails and the road / bridge after installation. The rapid installation structure includes a road / bridge body with pre-reserved reinforcing bars. Multiple prefabricated concrete guardrails are installed on the road / bridge body at the pre-reserved reinforcing bars via grouting. Each prefabricated concrete guardrail has a grouting groove, and an L-shaped reinforcing bar is placed within the grouting groove. The pre-reserved reinforcing bars are located within the grouting groove and are interlocked with the L-shaped reinforcing bars. The grouting groove has a grouting port and a vent, and is filled with grout. This technology uses the L-shaped reinforcing bars and the U-shaped pre-reserved reinforcing bars at the connection point between the prefabricated guardrails and the road / bridge to form a structure similar to compression or interlocking, and the position is fixed under the action of the grout, making the connection between the guardrails and the road / bridge more secure.

Description

Technical Field

[0001] This utility model relates to the field of precast concrete guardrail technology used in road and bridge engineering. Background Technology

[0002] In road and bridge engineering, according to the design drawings provided by the design institute, safety guardrails are divided into different impact resistance indicators. Among them, concrete guardrails have the advantages of strong impact resistance and low cost, and are widely used in road and bridge engineering.

[0003] Existing concrete guardrails can be divided into cast-in-place concrete guardrails and precast quick-assembly concrete guardrails, depending on the construction and installation process. Due to the advantages of factory standard manufacturing and rapid assembly construction, precast quick-assembly concrete guardrails have been rapidly promoted in recent years.

[0004] For example, CN220503672U describes a precast concrete guardrail and its assembly. The technical implementation involves creating a tensioning slot at the top of the precast concrete guardrail, designating the top as the tensioning end. This facilitates construction during installation and results in a smooth appearance for both the guardrail and its foundation after installation. The technical approach uses anchor bolts for tensioning, offering the advantage of rapid installation. However, this method also has significant drawbacks. Specifically, the anchor bolts are susceptible to corrosion and failure. Furthermore, relying solely on anchor bolts for tensioning does not achieve sufficient interlocking between the beam and the guardrail, making this type of concrete guardrail prone to failure upon impact. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a prefabricated guardrail quick-installation structure for road and bridge engineering, solving the installation problems of existing concrete quick-installation guardrails and the issue of the bonding strength between the guardrail and the road / bridge after installation.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] A precast guardrail quick-installation structure for road and bridge engineering includes a road and bridge main body with reserved reinforcement bars. The reserved reinforcement bars are "gate" shaped steel bars. Multiple precast concrete guardrails are installed on the road and bridge main body at the reserved reinforcement bars via grouting connections. Each precast concrete guardrail has a grouting groove, and an L-shaped steel bar is placed within the grouting groove. The reserved reinforcement bars are located within the grouting groove, and the L-shaped steel bars are engaged with the reserved reinforcement bars. The grouting groove has a grouting port and an vent, and the grouting groove is filled with grout.

[0008] Furthermore, the precast concrete guardrail is provided with dovetail grooves on both sides, and a grouting cavity is formed between two adjacent dovetail grooves after docking, and the grouting cavity is filled with concrete.

[0009] Further, a row of steel bars is provided in the grouting cavity.

[0010] Further, the row of steel bars is in a "Feng" character structure formed by welding one long steel bar and multiple short steel bars.

[0011] Further, the depth of the grouting groove is 15 cm.

[0012] Further, the wall thickness of the grouting groove is designed to be between 2 - 4 cm.

[0013] Further, the L-shaped steel bars are arranged in pairs along the length direction of the guardrail in a row, and each pair of L-shaped steel bars corresponds to the reserved steel bars one by one.

[0014] Further, the interval between the reserved steel bars is designed to be 20 cm.

[0015] Further, the road and bridge main body is one of a precast concrete box girder, a steel box girder, and a cast-in-place concrete beam.

[0016] The beneficial effects of the present utility model are:

[0017] In this technology, at the joint between the precast guardrail and the road and bridge, a structure similar to pressing or buckling is formed between the L-shaped steel bars and the door-shaped reserved steel bars, and the position is fixed under the action of the grouting slurry, making the joint between the guardrail and the road and bridge more reliable. Its reliability strength is equivalent to that of the concrete guardrail formed by the cast-in-place construction process, but the construction speed is several times higher than that of the traditional cast-in-place process. The implementation of this technology can be widely applied to road and bridge projects and has a relatively wide range of uses. Description of the Drawings

[0018] Figure 1 is the installation schematic diagram of the present utility model.

[0019] Figure 2 is the transverse partial node view of the present utility model.

[0020] Figure 3 is the longitudinal partial node view of the present utility model.

[0021] Figure 4 is the three-dimensional view of the precast concrete guardrail.

[0022] Figure 5 is the three-dimensional view of the precast concrete guardrail.

[0023] In the figure:

[0024] 10 Precast concrete box girder, 11 Reserved steel bars,

[0025] 20 Precast concrete guardrail, 21 L-shaped steel bar, 22 Grouting port, 23 Vent, 24 Grouting groove, 25 Dovetail groove, 26 Steel bar strip

[0026] 30. Hardened mortar. Detailed Implementation

[0027] The prefabricated guardrail quick installation structure for road and bridge engineering is implemented based on bridge or road engineering. The following is an explanation using prefabricated concrete box girders as an example.

[0028] refer to Figures 1 to 3 This invention demonstrates a quick-assembly structure for precast concrete guardrails and precast concrete box girders. In this structure, according to design requirements, the precast concrete box girder 10 has pre-reserved U-shaped reinforcing bars on both sides, known as pre-reserved bars 11. These pre-reserved bars are used for the installation and connection of the precast concrete guardrails. In this embodiment, the installation does not use anchor bolts or screws for mechanical connection; instead, grouting is employed to quickly fix the precast concrete guardrails and precast concrete box girders together.

[0029] Precast concrete guardrail 20, reference Figures 1 to 5 The cross-section of this precast concrete guardrail conforms to the design drawings provided by the design institute. It is entirely precast with reinforced concrete. Unlike ordinary precast concrete guardrails, this guardrail has a grouting groove 24 on its lower surface. This groove is approximately 15 cm deep and is used to accommodate the aforementioned pre-reserved reinforcing bars 11, which can be inserted into the groove. The wall thickness of the groove is designed to be between 2-4 cm to ensure sufficient strength. Adhesive mortar is pre-applied to the area where the groove meets the precast concrete box girder, forming a grouting method for sealing. After initial curing, the groove is sealed. L-shaped reinforcing bars 21 are pre-installed within the groove. These L-shaped bars are arranged in pairs along the length of the guardrail, with each pair corresponding to a pre-reserved reinforcing bar. These L-shaped bars have a special design that provides a self-locking effect to the U-shaped pre-reserved reinforcing bars during installation. The self-locking effect and process are as follows: Gradually approach and place the guardrail in the installation position. After it is in place, push the guardrail slightly in the direction of the L-shaped steel bar. After pushing, the L-shaped steel bar will interlock with the gate-shaped reserved steel bar. This interlocking makes the guardrail and the reserved steel bar more closely connected.

[0030] On the outer wall of the grouting groove of the above-mentioned precast concrete guardrail 20, there are grouting ports 22 and exhaust ports 23, which are connected to the uniform grouting groove. Bonding mortar is poured into the grouting port through grouting equipment until mortar overflows from the exhaust port. After grouting, use wooden plugs to block the above-mentioned grouting port and exhaust port, and then carry out long-term maintenance, for example, maintain for 7 days. After maintenance, the grouting slurry solidifies and fills the grouting groove. Under the action of the solidified mortar 30, the gap between the L-shaped steel bars and the reserved U-shaped bars is completely filled, and the complete fixation of the precast guardrail and the box girder is achieved. The joint formed by this connection method has the advantage of high connection strength, and grouting operation can also achieve efficient rigid connection.

[0031] Preferably, the interval between the reserved bars 11 in this embodiment is designed to be 20 cm. In this way, for a guardrail with a length of 2 meters, under the combined action of 9 pairs of L-shaped steel bars and 9 reserved bars, a dense咬合 connection is formed. After grouting, the positions of the L-shaped steel bars and the reserved bars are fixed, which well solves the problems of low strength and poor impact resistance of the connection joints of traditional precast guardrails.

[0032] Furthermore, refer to Figure 4 , there are dovetail grooves 25 on both sides of the precast concrete guardrail 20. After installation and docking, the dovetail grooves between two adjacent precast concrete guardrails form a grouting cavity relatively. A steel bar row 26 is placed in the grouting cavity. The steel bar row is in the shape of a丰字, composed of one long bar and multiple short bars. Finally, ordinary concrete is poured into the above-mentioned grouting cavity. After the concrete solidifies, it connects the guardrails on both sides together with the steel bar row. In this way, all the precast guardrails are connected into a whole.

[0033] Furthermore, the length of the above-mentioned dovetail groove only needs to be half of the height of the precast guardrail.

[0034] The construction process is as follows:

[0035] In the first step, installation lines are drawn and planned on the bridge to initially determine the installation of the precast concrete guardrail. Then, the bonding mortar is initially spread in the guardrail installation area, and the spreading thickness of the bonding mortar is controlled at about 1 cm.

[0036] The second step involves hoisting the precast concrete guardrail, gradually bringing it closer to the pre-reserved reinforcement installation point below, maintaining a distance of approximately 10 centimeters from the previously installed guardrail. As the hoisted guardrail approaches the installation point, a push is applied to it, bringing it closer to the installed guardrail. During this process, the L-shaped reinforcement and the gate-shaped pre-reserved reinforcement interlock. The guardrail is then fully lowered and the hoisting equipment removed, completing the hoisting of one section of the precast guardrail. The next section is then hoisted. After completing a construction section, for example, 1 kilometer, bonding mortar is injected into the grouting port using grouting equipment until mortar overflows from the vent. After grouting, the grouting port and vent are sealed with wooden plugs, followed by long-term curing, such as 7 days. Simultaneously, the dovetail grooves on both sides of the guardrail are grouted to form an auxiliary connection.

[0037] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Without departing from the spirit of the present utility model, all modifications and improvements to the present utility model by those skilled in the art should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A prefabricated guardrail quick-installation structure for road and bridge engineering, including the main body of the road and bridge, which has pre-reserved reinforcing bars, characterized in that: The reserved reinforcement is a "door"-shaped steel bar. Multiple precast concrete guardrails are installed on the road and bridge main body at the reserved reinforcement through grouting connection. Among them, the precast concrete guardrail has a grouting groove, and an L-shaped steel bar is arranged in the grouting groove. The reserved reinforcement is located in the grouting groove, and the L-shaped steel bar is buckled with the reserved reinforcement. The grouting groove has a grouting port and an exhaust port, and the grouting groove is filled with grouting slurry.

2. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 1, characterized in that, Splayed grooves are arranged on both sides of the precast concrete guardrail, and a grouting cavity is formed between two adjacent splayed grooves after docking. The grouting cavity is filled with concrete.

3. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 2, characterized in that, A steel bar row is arranged in the grouting cavity.

4. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 3, characterized in that, The steel bar row is a "Feng"-shaped structure formed by welding one long steel bar and multiple short steel bars.

5. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 1, characterized in that, The depth of the grouting groove is 15 cm.

6. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 1, characterized in that, The wall thickness of the grouting groove is designed between 2 - 4 cm.

7. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 1, characterized in that, The L-shaped steel bars are arranged in pairs and arranged in a row along the length direction of the guardrail, and each pair of L-shaped steel bars corresponds to the reserved reinforcement respectively.

8. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 7, characterized in that, The interval between the reserved reinforcements is designed to be 20 cm.

9. The prefabricated guardrail quick-installation structure for road and bridge engineering according to claim 1, characterized in that, The road and bridge main body is one of a precast concrete box girder, a steel box girder, and a cast-in-place concrete beam.

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