A highway concrete guardrail heightening and strengthening structure and its method

Abstract

The present invention discloses a structure and method for heightening and strengthening a highway concrete guardrail. The structure is provided with drilled holes connecting the guardrail, the guardrail foundation and the road shoulder. Hollow steel pipes are arranged in the drilled holes. A precast concrete heightening member is provided at the upper end of the guardrail. A reserved hole for butt-jointing with the upper end of the hollow steel pipe is provided on the precast concrete heightening member. A grouting hole is provided on the precast concrete heightening member, and the grouting hole is communicated with the reserved hole. Mud filling layers are arranged in the gaps between the drilled holes and the hollow steel pipes and inside the hollow steel pipes. A side connection structure is provided between the guardrail and the precast concrete heightening member. The present invention can heighten and strengthen the old concrete guardrail at the same time. Meanwhile, it is convenient for operation and saves the reconstruction time.

Description

Technical Field

[0001] The present invention relates to a structure and method for heightening and strengthening a highway concrete guardrail, belonging to the technical field of heightening and strengthening of concrete guardrails. Background Art

[0002] At present, the transformation of highway concrete guardrails generally includes two methods: demolition and reconstruction, and heightening and reuse. The former will not only increase the transformation cost and waste of resources, but may also cause damage to the roadbed when excavating the foundation for demolishing the guardrail. For the latter method of heightening and reuse, it mainly adopts methods such as adding upper metal components or chiseling part of the concrete for planting steel bars and pouring concrete to increase the overall height of the guardrail. This scheme only considers the reinforcement treatment of the concrete guardrail wall body, without considering the reinforcement of the concrete guardrail foundation and enhancing the overall stability of the wall body and the foundation. And the existing technology generally adopts the cast-in-place scheme, with a long construction period, great impact on traffic, and greater impact on maintenance and management work.

[0003] The stability of the concrete guardrail foundation and the bearing capacity of the foundation base are important factors affecting the overall protection performance of the concrete guardrail. However, during the operation of existing highways, it is inevitable that problems such as settlement, looseness, and decline in bearing capacity occur on the road shoulders. When strengthening, heightening and reusing, the bearing capacity of the foundation base should be improved, the integrity of the wall body and the foundation should be enhanced, and considering the particularity of the maintenance project, it is also necessary to shorten the construction time as much as possible and reduce the traffic interference caused by construction.

[0004] That is: there is a need for a structure and method for heightening and strengthening a highway concrete guardrail, which can heighten the guardrail while strengthening the old concrete guardrail, and at the same time, is easy to operate and saves the transformation time. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a structure and method for heightening and strengthening a highway concrete guardrail, which can heighten the guardrail while strengthening the old concrete guardrail, and at the same time, is easy to operate and saves the transformation time; it can overcome the deficiencies of the prior art.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] The present invention discloses a structure and method for heightening and strengthening a highway concrete guardrail. The structure includes a drilling hole connecting the guardrail, the guardrail foundation and the road shoulder. A hollow steel pipe is provided in the drilling hole. A precast concrete heightening member is provided at the upper end of the guardrail. A reserved hole is provided on the precast concrete heightening member for docking with the upper end of the hollow steel pipe. A grouting hole is provided on the precast concrete heightening member, and the grouting hole is communicated with the reserved hole. A mud filling layer is provided in the gap between the drilling hole and the hollow steel pipe and inside the hollow steel pipe. A side connection structure is provided between the guardrail and the precast concrete heightening member.

[0008] The above side connection structure is a connecting plate provided between the guardrail and the precast concrete heightening member. Anchor holes Ⅰ are provided on the connecting plate, the guardrail and the precast concrete heightening member, and anchor bolts Ⅰ are provided in the anchor holes.

[0009] Threaded holes are provided on the above-mentioned hollow steel pipe, and anchor holes Ⅱ corresponding to the threaded holes are provided on the guardrail and the precast concrete heightening member. The guardrail and the precast concrete heightening member are connected to the hollow steel pipe through anchor bolts Ⅱ.

[0010] The aforementioned grouting hole is located on the side wall of the precast concrete heightening member.

[0011] In this method, by drilling a hole through the guardrail foundation and deep into the road shoulder on the existing guardrail, a precast concrete heightening member is set on the guardrail. A reserved hole for docking with the drilled hole is provided on the precast concrete heightening member. A hollow steel pipe for connection is set in the drilled hole and the reserved hole, and then a slurry filling layer is filled in the gap between the drilled hole and the hollow steel pipe and inside the hollow steel pipe to achieve heightening and strengthening.

[0012] The method for heightening and strengthening the highway concrete guardrail is as follows: Step 1: Drill a hole in the existing guardrail. The drilled hole penetrates the guardrail foundation and extends deep into the road shoulder, and a hollow steel pipe is set in the drilled hole; Step 2: Docking with the upper end of the hollow steel pipe through the reserved hole on the precast concrete heightening member; Step 3: Grouting through the grouting hole on the precast concrete heightening member to fill the gap between the drilled hole and the hollow steel pipe and inside the hollow steel pipe with slurry; Step 4: Sidewise reinforce the guardrail and the precast concrete heightening member.

[0013] The beneficial effects of the present invention are:

[0014] 1. By opening a hole in the existing guardrail and penetrating it to the road shoulder, and implanting an externally exposed hollow steel pipe in the hole for connecting the upper-end precast concrete heightening member, and then pouring concrete into the connected gap and the hollow steel pipe, the old concrete guardrail can be strengthened while heightening, and at the same time, it is convenient for operation and saves the transformation time.

[0015] 2. With an advanced reinforcement and elevation concept, it solves the problem that the current reinforcement scheme does not consider the reinforcement of the guardrail foundation and bearing capacity. By setting through small steel pipes and secondary grouting, a composite foundation is formed, enhancing the integrity of the concrete guardrail wall body and the foundation and strengthening the roadbed and road shoulder, providing new ideas and methods for improving the protection performance of the concrete guardrail.

[0016] 3. It has a wide range of applications. The size of the precast concrete heightening member can be adjusted to meet the requirements for the height and shape of the old concrete guardrail to be heightened, realizing the reasonable utilization of the original guardrail structure materials and saving the maintenance cost to the greatest extent.

[0017] 4. Quick assembly shortens the operation time. Specifically, prefabricated components are adopted, prefabricated in advance and assembled on-site, effectively shortening the construction time and reducing traffic interference caused by construction.

[0018] 5. By the form of installing hollow steel pipes through drilling and then pouring, it can reduce the damage to the old concrete guardrail and realize the reinforcement of the old guardrail.

[0019] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. Brief Description of the Drawings

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings, where:

[0021] Figure 1 It is a schematic diagram of the three-dimensional connection structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the connection structure of the hollow steel pipe of the present invention.

[0023] Among them, guardrail 1, guardrail foundation 2, road shoulder 3, hollow steel pipe 4, reserved hole 5, grouting hole 6, slurry filling layer 7, side connection structure 8, anchor bolt I 9, precast concrete heightening member 10. Detailed Embodiment

[0024] The following will refer to the drawings and describe the preferred embodiments of the present invention in detail. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the protection scope of the present invention.

[0025] Such as Figure 1 - Figure 2As shown, the highway concrete guardrail heightening and reinforcement structure and method thereof are structurally rebuilt on the basis of the existing guardrail, guardrail foundation 2 and shoulder 3. The operation method is to use a drilling machine to drill a hole from the top of the connecting guardrail 1, and then drill through the connecting guardrail 1 to the guardrail foundation 2. The hole diameter is determined according to the size of the upper end surface of the connecting guardrail 1, generally 8-12 cm. A hollow steel pipe 4 is inserted into the drilled hole. After insertion, the upper end of the hollow steel pipe 4 should leak out of the upper end of the connecting guardrail 1 by 5-30 cm, which is specifically determined according to the height increase. A precast concrete heightening member 10 is provided in advance, and a reserved hole 5 is provided on the precast concrete heightening member 10 to connect with the upper end of the hollow steel pipe 4. A grouting hole 6 is provided on the precast concrete heightening member 10, and the grouting hole 6 is connected to the reserved hole 5. The grouting hole 6 is located on the side wall of the precast concrete heightening member 10. The precast concrete raising component 10 is docked above the connecting guardrail 1, and concrete is poured into the gap between the drill hole and the hollow steel pipe 4 and into the hollow steel pipe 4 using the grouting holes 6 to form a mud filling layer 7. Pouring mud is conducive to connecting the hollow steel pipe 4, the guardrail 1 and the precast concrete raising component 10 as a whole. For the convenience of construction, the hollow steel pipe 4 can also be installed in the drill hole to directly cast the hollow steel pipe 4 and the guardrail 1, and finally grouting is performed through the grouting holes 6 to realize the connection between the hollow steel pipe 4 and the precast concrete raising component 10.

[0026] A side connection structure 8 is provided between the guardrail 1 and the precast concrete raising member 10. The side connection structure 8 is a connecting plate provided between the guardrail 1 and the precast concrete raising member 10. Anchor holes I are provided on the connecting plate, the guardrail 1 and the precast concrete raising member 10. Anchor bolts I9 are provided on the anchor holes. When the side connection structure 8 is installed, it is distributed along the length direction of the guardrail 1. The guardrail 1 and the precast concrete raising member 10 can be further fixed through the side connection structure 8.

[0027] Screw holes are provided on the hollow steel pipe 4, and anchor holes II corresponding to the threaded holes are provided on the guardrail 1 and the precast concrete raising member 10. The guardrail 1 and the precast concrete raising member 10 are connected to the hollow steel pipe 4 through anchor bolts II.

[0028] The method comprises the following steps: drilling a hole on the existing guardrail 1 that penetrates the guardrail foundation 2 and extends into the shoulder of the road, setting a precast concrete raising component 10 on the guardrail 1, providing a reserved hole 5 on the precast concrete raising component 10 that is connected to the drill hole, setting a hollow steel pipe 4 for connection in the drill hole and the reserved hole 5, and then filling a mud filling layer 7 in the gap between the drill hole and the hollow steel pipe 4 and in the hollow steel pipe 4 to achieve raising and reinforcement.

[0029] During construction, the specific construction steps are:

[0030] Step 1: Drill holes in the existing guardrail 1. The holes penetrate through the guardrail foundation 2 and extend into the road shoulder, and a hollow steel pipe 4 is arranged in the holes. Step 2: Connect the upper end of the hollow steel pipe 4 through the reserved hole 5 on the precast concrete heightening member 10. Step 3: Inject slurry through the grouting hole 6 on the precast concrete heightening member 10 to fill the gap between the hole and the hollow steel pipe 4 and the inside of the hollow steel pipe 4 with mud. Step 4: Strengthen the sides of the guardrail and the precast concrete heightening member 10.

[0031] The above are only the preferred embodiments of the present invention, and do not impose any form of confidentiality restrictions on the present invention. Any simple modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A highway concrete guardrail heightening and strengthening structure, Characterized in that: It includes a drilling hole connecting the guardrail (1), the guardrail foundation (2) and the road shoulder (3). A hollow steel pipe (4) is provided in the drilling hole. A precast concrete heightening member (10) is provided at the upper end of the guardrail (1). A reserved hole (5) for docking with the upper end of the hollow steel pipe (4) is provided on the precast concrete heightening member (10). A grouting hole (6) is provided on the precast concrete heightening member (10). The grouting hole (6) is communicated with the reserved hole (5). A mud filling layer (7) is provided in the gap between the drilling hole and the hollow steel pipe (4) and inside the hollow steel pipe (4). A side connection structure (8) is provided between the guardrail (1) and the precast concrete heightening member (10); The side connection structure (8) is a connecting plate provided between the guardrail (1) and the precast concrete heightening member (10). Anchor holes I are provided on the connecting plate, the guardrail (1) and the precast concrete heightening member (10). Anchor bolts I (9) are provided in the anchor holes I; Threaded holes are provided on the hollow steel pipe (4). Anchor holes II corresponding to the threaded holes are provided on the guardrail (1) and the precast concrete heightening member (10). The guardrail (1) and the precast concrete heightening member (10) are connected to the hollow steel pipe (4) through anchor bolts II.

2. The highway concrete guardrail heightening and strengthening structure according to claim 1, Characterized in that: The grouting hole (6) is located on the side wall of the precast concrete heightening member (10).

3. A heightening and strengthening method for the highway concrete guardrail heightening and strengthening structure according to any one of claims 1 or 2, Characterized in that: By drilling a drilling hole through the guardrail foundation (2) and deep into the road shoulder (3) on the existing guardrail (1), setting a precast concrete heightening member (10) on the guardrail (1), providing a reserved hole (5) on the precast concrete heightening member (10) for docking with the drilling hole, and filling a mud filling layer (7) in the gap between the drilling hole and the reserved hole (5) and inside the hollow steel pipe (4) for connection, so as to achieve heightening and strengthening.

4. The heightening and strengthening method for the highway concrete guardrail heightening and strengthening structure according to claim 3, Characterized in that: The specific steps are as follows: Step 1: Drill a hole in the existing guardrail (1). The drilling hole penetrates the guardrail foundation (2) and deep into the road shoulder (3), and a hollow steel pipe (4) is arranged in the drilling hole; Step 2: Docking through the reserved hole (5) on the precast concrete heightening member (10) with the upper end of the hollow steel pipe (4); Step 3: Grout through the grouting hole (6) on the precast concrete heightening member (10), and fill the gap between the drilling hole and the hollow steel pipe (4) and the inside of the hollow steel pipe (4) with mud; Step 4: Sidewise strengthen the guardrail (1) and the precast concrete heightening member (10).

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