Detachable UHPC prefabricated guardrail structure for highway airport runway

Abstract

The utility model discloses a detachable UHPC (Ultra High Performance Concrete) prefabricated guardrail structure for a highway airport runway. The guardrail structure comprises UHPC prefabricated guardrail sections and connecting rods. Each UHPC prefabricated guardrail section is composed of a UHPC prefabricated shell and internal filling concrete; the connecting rods transversely penetrate through the UHPC prefabricated guardrail sections and are poured in the internal filling concrete; a groove is formed in one end of each connecting rod, an inserting strip matched with the groove is arranged at the other end of each connecting rod, and the UHPC prefabricated guardrail sections are spliced by inserting the inserting strips of the connecting rods into the grooves; coaxial round holes are vertically formed in the grooves and the inserting strips, and the stand columns are inserted into the round holes to be fixedly spliced in the mode of being perpendicular to the ground. According to the guardrail structure, the overall anti-collision performance of the guardrail is guaranteed, vehicles can be prevented from crossing, the effects of blocking, buffering and guiding the out-of-control vehicles are achieved, the transfer efficiency of the UHPC prefabricated guardrail sections can be improved through the detachable flexibility of the connecting assemblies, and therefore the technical standard of highway airport runways is met.

Description

Technical Field

[0001] This utility model belongs to the field of highway guardrail technology, specifically relating to a detachable UHPC prefabricated guardrail structure for highway and airport runways. Background Technology

[0002] Highway airport runways are a special type of runway, typically converted temporarily or permanently from sections of highways or roads, for aircraft takeoffs and landings, refueling, or temporary parking. Movable barriers on highway airport runways usually need to meet higher safety standards and flexibility requirements, enabling rapid dismantling and safe collision avoidance to ensure the safety of aircraft takeoffs and landings. Currently, the main types of movable barriers for highway airport runways are corrugated beam steel barriers and concrete barriers, and their collision protection level and applicable conditions need to be selected based on the specific road conditions. After long-term service, both types of barriers will experience corrosion, material aging, structural damage, and peeling of the surface anti-corrosion layer, leading to a reduction in the barrier's durability and collision protection performance. Summary of the Invention

[0003] To address the aforementioned problems, this utility model designs a detachable UHPC prefabricated guardrail structure for highway and airport runways. This structure requires no special tools or welding, avoids on-site hot work, and is reusable, reducing material waste and replacement frequency. It offers advantages such as convenient installation and disassembly, flexible adaptability, cost-effectiveness, and high safety.

[0004] The detachable UHPC prefabricated guardrail structure for highway and airport runways includes UHPC prefabricated guardrail segments and connecting rods. Each UHPC prefabricated guardrail segment consists of a UHPC prefabricated shell and internal concrete filling. The connecting rods traverse the UHPC prefabricated guardrail segments and are cast within the internal concrete filling. One end of the connecting rod has a groove, and the other end has a strip that fits into the groove. Multiple UHPC prefabricated guardrail segments are joined together by inserting the connecting rod's strip into the groove. The groove and strip have coaxial circular holes perpendicularly formed, and the posts are inserted perpendicularly into these holes for fixation and joining.

[0005] The UHPC precast shell is a thin shell with a thickness of not less than 2.5 cm, a compressive strength of not less than 120 MPa, a tensile strength of not less than 5 MPa, and the compressive strength of the concrete filling inside is not less than 20 MPa.

[0006] The connecting rod is a solid steel rod with a diameter of 100mm.

[0007] The column has a diameter of 30mm and a height that is the same as that of the guardrail.

[0008] The connecting rods are arranged in three rows from top to bottom. The center of the lower connecting rod is 23.5cm from the bottom surface of the UHPC prefabricated shell, and the center of adjacent connecting rods is 30cm apart.

[0009] The distance between two adjacent UHPC prefabricated guardrail segments shall not exceed 15cm.

[0010] An anti-slip pad is bonded to the bottom of the UHPC prefabricated shell. The anti-slip pad is a rubber anti-slip pad.

[0011] The technical advantages of this utility model are:

[0012] 1. This utility model designs a detachable UHPC prefabricated guardrail for highway and airport runways. The detachable guardrail system is constructed by connecting components and anti-slip pads. The mechanical assembly of the rigid concrete guardrail ensures the overall anti-collision performance of the guardrail, which can prevent vehicles from passing through and play a role in blocking, buffering and guiding out-of-control vehicles.

[0013] 2. This utility model forms a detachable guardrail system by splicing connecting components. The guardrail segments can be reused, reducing material waste and replacement frequency. The detachable flexibility of the connecting components can improve the transfer efficiency of UHPC prefabricated guardrail segments, thereby meeting the technical standards of highway and airport runways. Attached Figure Description

[0014] Figure 1 This is a perspective view of the detachable UHPC prefabricated guardrail segment prefabricated shell in Embodiment 1.

[0015] Figure 2 This is a cross-sectional schematic diagram of the detachable UHPC prefabricated guardrail segment and connecting components in Embodiment 1.

[0016] Figure 3 This is a partial front view of the splicing part of the detachable UHPC prefabricated guardrail in Embodiment 1.

[0017] Figure 4 This is a partial perspective view of the detachable UHPC prefabricated guardrail in Embodiment 1.

[0018] Reference numerals: 1-UHPC precast shell, 2-concrete, 3-connecting rod, 4-column, 5-jointing groove, 6-round hole, 7-anti-slip pad. Detailed Implementation

[0019] Example 1

[0020] Reference Figure 2 and 3A detachable UHPC prefabricated guardrail structure for highway and airport runways includes UHPC prefabricated guardrail segments and connecting rods. Each UHPC prefabricated guardrail segment consists of a UHPC prefabricated shell and internal concrete filling. The connecting rods traverse the UHPC prefabricated guardrail segments and are cast within the internal concrete filling. The connecting rods have splicing slots at both ends, one end with a groove and the other end with an insert that fits into the groove. Multiple UHPC prefabricated guardrail segments are spliced ​​by inserting the connecting rod's insert into the groove. The groove and insert have coaxial circular holes perpendicularly formed, and a post is inserted perpendicularly to the ground into the circular hole for fixed splicing.

[0021] The UHPC precast shell is a thin shell with a thickness of 3cm, a compressive strength of not less than 120MPa, a tensile strength of not less than 5MPa, and the compressive strength of the concrete filling inside is not less than 20MPa.

[0022] The connecting rod is a solid steel rod, 4.2m long and 100mm in diameter. This ensures both the service life of the guardrail and enhances its impact resistance.

[0023] The column has a diameter of 30mm and a height that is the same as that of the guardrail.

[0024] The connecting rods are arranged in three rows from top to bottom. The center of the lower connecting rod is 23.5cm from the bottom surface of the UHPC prefabricated shell, and the center of adjacent connecting rods is 30cm apart.

[0025] The splicing groove is 50mm wide, the diameter of the round hole is 30mm, and the distance between the center of the hole and the end of the rod is 25mm.

[0026] The spacing between two adjacent UHPC prefabricated guardrail segments is 12cm.

[0027] The UHPC prefabricated shell has an anti-slip pad adhered to its bottom and is placed horizontally on the road surface. The anti-slip pad is made of rubber and has good wear resistance and anti-slip properties. The anti-slip pad at the bottom of the guardrail prevents significant lateral displacement of the guardrail upon vehicle collision, thus avoiding disruption to the normal driving of surrounding vehicles.

[0028] Before pouring the internal filling concrete, the connecting rod is fixed in the marked position with the help of templates and supports.

[0029] When guardrails need to be moved, the posts are removed, and heavy machinery is used to move the guardrail sections one by one to the designated location. When highways and airport runways are restored to ordinary road use, the guardrail sections are transported to their original location for mechanical assembly, restoring them to normal service status.

[0030] A full-vehicle SB-level crash simulation test was conducted on the detachable UHPC prefabricated guardrail structure used for highway and airport runways. The three vehicle types did not cross, overturn, or straddle the test guardrail. After the collision, the vehicles did not overturn and drove out almost parallel to the guardrail. The lateral displacement of the guardrail after the collision did not endanger the driving of adjacent vehicles. The designed guardrail has good guiding function and its safety performance meets the SB protection level requirements.

Claims

1. A detachable UHPC precast barrier structure for highway airport runway, characterized in that, The guardrail structure comprises a UHPC prefabricated guardrail segment and a connecting rod; the UHPC prefabricated guardrail segment is composed of a UHPC prefabricated shell and internally filled concrete; the connecting rod crosses the UHPC prefabricated guardrail segment and is cast in the internally filled concrete; one end of the connecting rod is provided with a groove, and the other end is provided with a plug that is fitted with the groove, a plurality of UHPC prefabricated guardrail segments are spliced by inserting the plug of the connecting rod into the groove; the groove and the plug are provided with coaxial round holes vertically, and a stand is inserted into the round hole vertically to fix and splice.

2. The detachable UHPC precast barrier for highway-airport runway according to claim 1, characterized in that, The UHPC prefabricated shell is a thin shell with a thickness not less than 2.5 cm, a compressive strength not less than 120 MPa, a tensile strength not less than 5 MPa, and a compressive strength of the internally filled concrete not less than 20 MPa.

3. The detachable UHPC precast barrier for highway-airport runway according to claim 1, characterized in that, The connecting rod is a solid steel rod with a diameter of 100 mm.

4. The detachable UHPC precast barrier for highway-airport runway according to claim 1, characterized in that, The stand has a diameter of 30 mm and a height same as that of the guardrail.

5. The demountable UHPC precast barrier for a highway-airport runway according to claim 1, characterized in that, Three connecting rods are arranged from top to bottom, and the center of the lower connecting rod is 23.5 cm away from the bottom surface of the UHPC prefabricated shell; the centers of adjacent connecting rods are 30 cm apart.

6. The demountable UHPC precast barrier for a highway-airport runway according to claim 1, characterized in that, The distance between two adjacent spliced UHPC prefabricated guardrail segments is not more than 15 cm.

7. The demountable UHPC precast barrier for a highway-airport runway according to claim 1, characterized in that, The bottom of the UHPC prefabricated shell is bonded with a non-slip pad.

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