A multi-stage energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall

Abstract

The present invention discloses a multi-stage energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall. Concrete retaining walls are cast at the bottom of both sides of the railway track. Memory foam is fixed to the inner side of the concrete retaining walls on both sides, and a single-point displacement meter is installed on the memory foam. Multiple parallel geogrids are arranged in the middle area of ​​the concrete retaining wall. A driving shaft and a driven shaft are fixed in the middle. One end of the geogrid is hinged to the driven shaft, and the other end extends into the concrete retaining wall and is fixed. A box-shaped seismic foundation is provided below the geogrid. The upper and lower steel plates are connected by limiters on the left and right sides. A rubber air cushion is provided inside the formed box structure, and an elastic element is provided inside. The device of the present invention is provided with a three-level shock-absorbing structure, is highly practical, and is easy to manufacture and process, and has excellent seismic resistance.

Description

Technical Field

[0001] The present invention relates to a double-sided roadbed retaining wall for shock absorption at the bottom of a rail 17, and belongs to the field of railway engineering. Background Art

[0002] In recent years, infrastructure construction in western China has been in full swing, and highway mileage has continued to increase. With the continuous development and improvement of the high-speed rail network, more and more railway construction is being carried out in the west, and more and more projects are being developed in areas with more severe geological conditions. Since the Wenchuan earthquake, the impact of earthquakes on railway routes has gradually attracted people's attention. Roadbed retaining walls are an important component of railways and are crucial for ensuring roadbed stability and all-weather accessibility of lines. Reinforced earth roadbed retaining walls are a type of structure used to resist earth pressure, prevent soil collapse, and maintain soil stability. They are extremely widely used in railway and highway roadbed projects. This construction process saves space, is highly stable, and has an aesthetically pleasing appearance. However, in recent decades, a large number of reinforced earth projects at home and abroad have found that although reinforced earth roadbed retaining walls have good seismic resistance, they can still suffer serious damage under strong earthquakes, posing a significant safety hazard to railway traffic. Traditional reinforced earth retaining walls lack a good seismic resistance system, and their earthquake resistance effect is still unsatisfactory.

[0003] Therefore, how to systematically and proactively reduce the damage to roadbed retaining walls caused by seismic waves and horizontal ground displacement generated by earthquakes, especially to prevent serious damage to the top of the retaining wall, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a multi-level energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall to solve the safety hazards caused by the existing railway roadbed under earthquake problems.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A multi-stage energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall. A vertical concrete retaining wall is cast at the bottom of each side of the railroad track. A layer of hydrophobic memory foam is fixed to the inner side of each concrete retaining wall. The memory foam is modular, and gaps are left at the joints between the blocks for installing steel bars on the concrete retaining wall. A single-point displacement meter is also installed on the memory foam.

[0007] In the middle area of ​​the concrete retaining wall, multiple parallel geogrids are evenly arranged in a direction perpendicular to the concrete retaining wall. The geogrids are arranged in a row of two, with a driving shaft and driven shafts on both sides fixed in the middle. One end of the geogrid is hinged to the driven shaft, and the other end extends into the concrete retaining wall and is fixed. A grid displacement meter is also installed on the geogrid.

[0008] A box-shaped seismic foundation is provided below the geogrid, comprising an upper steel plate and a lower steel plate. The upper steel plate and the lower steel plate are connected by limiters on the left and right sides. The limiters control the distance between the upper steel plate and the lower steel plate. A rubber air cushion is provided inside the box structure. After the rubber air cushion is inflated, it is tightly attached to the upper steel plate and the lower steel plate, and an inflation valve and an air deflation valve are respectively provided on both sides of the rubber air cushion. An elastic element is provided inside the rubber air cushion to assist in maintaining the shape of the rubber air cushion, and an acceleration sensor is provided on the surface of the upper steel plate.

[0009] Furthermore, the elastic element in the rubber air cushion is a shock-absorbing and energy-absorbing spring.

[0010] Furthermore, a layer of geomembrane is wrapped on the memory foam.

[0011] The device of the present invention is suitable for mitigating earthquake damage to structures such as the roadbed along railway routes. It fully protects the rail tracks through a three-layer shock-absorbing arrangement from top to bottom. In the event of a minor earthquake, the first layer of memory foam provides cushioning. For moderate earthquakes, the left and right displacement of the geogrid can be adjusted to align the track structure. In the event of a more severe earthquake, the elastic elements in the bottom layer of the seismic foundation support the rubber air cushions to provide the ultimate cushioning effect. The entire device has a three-layer shock-absorbing structure, is highly practical, easy to manufacture, and provides excellent earthquake resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the multi-stage energy-absorbing reinforced soil double-sided roadbed retaining wall of the present invention;

[0013] Figure 2 This is a flow chart of the multi-stage energy dissipation and shock absorption of the present invention;

[0014] Among them, 1-concrete retaining wall, 2-memory sponge, 3-single-point displacement meter, 4-rebar, 5-driving shaft, 6-driven shaft, 7-geogrid, 8-grid displacement meter, 9-upper steel plate, 10-lower steel plate, 11-limiter, 12-elastic element, 13-inflation valve, 14-deflation valve, 15-acceleration sensor, 16-rubber air cushion, 17-rail. DETAILED DESCRIPTION

[0015] The present invention will be described in further detail below with reference to the accompanying drawings.

[0016] A multi-stage energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall, such as Figure 1As shown, a vertical concrete retaining wall 1 is cast at the bottom of each side of the rail 17. A layer of hydrophobic memory foam 2 is fixed to the inner side of each concrete retaining wall 1. The memory foam 2 is modular, with gaps left at the joints between the blocks for mounting steel bars 4 on the concrete retaining wall 1. A single-point displacement meter 3 is also mounted on the memory foam 2. To protect the memory foam 2, a geomembrane can be wrapped around it to further enhance its waterproof properties and help it cushion the entire rail 17.

[0017] In the middle area of ​​the concrete retaining wall 1, a plurality of parallel geogrids 7 are evenly arranged in a direction perpendicular to the concrete retaining wall 1. The geogrids 7 are arranged in a row of two, with a driving shaft 5 and driven shafts 6 on both sides fixed in the middle. One end of the geogrid 7 is hinged to the driven shaft 6, and the other end extends into the concrete retaining wall 1 and is fixed. A grid displacement meter 8 is also installed on the geogrid 7.

[0018] Below the geogrid 7, a box-shaped seismic foundation is provided, comprising an upper steel plate 9 and a lower steel plate 10. The upper steel plate 9 and the lower steel plate 10 are connected by limiters 11 on the left and right sides. The limiters 11 control the spacing between the upper steel plate 9 and the lower steel plate 10. A rubber air cushion 16 is provided inside the box structure. After being inflated, the rubber air cushion 16 is tightly attached to the upper steel plate 9 and the lower steel plate 10. An inflation valve 13 and an deflation valve 14 are provided on both sides of the rubber air cushion 16. An elastic element 12 is provided inside the rubber air cushion 16 to assist in maintaining the shape of the rubber air cushion 16. An acceleration sensor 15 is provided on the surface of the upper steel plate 9. From the perspective of cost and practicality, the elastic element 12 can be a shock-absorbing energy-absorbing spring. Using a shock-absorbing energy-absorbing spring against the rubber air cushion 16 can maintain the approximate shape of the rubber air cushion 16, and prevent excessive deformation during inflation or deflation, which affects its service life.

[0019] like Figure 2As shown, the device of the present invention uses a three-level shock-absorbing system to protect the entire rail 17 structure from top to bottom when encountering an earthquake. When encountering a small earthquake or daily working conditions, the memory sponge 2 on the inner side of the concrete retaining wall 1 has a shock-absorbing effect. At this time, the shape-sacrificing sponge plays a role. It can be compressed and then rebound to consume the energy generated by deformation. The deformation it resists can be uneven deformation. When the deformation of the memory sponge 2 exceeds 10mm, the memory sponge 2 fails; when the earthquake level is medium, the rail 17 undergoes horizontal displacement. At this time, the active shaft 5 drives the geogrid 7 to move left and right through the driven shafts 6 on both sides to adjust to the normal position. The maximum strain of the geogrid 7 cannot exceed 2%. When it exceeds 2%, the geogrid 7 tensioning device stops working; when the vibration is large, that is, the acceleration measured by the acceleration sensor 15 is too large, the final shock absorption is automatically performed through the box-shaped seismic foundation, and the rubber air cushion 16 supported by the elastic element 12 is inflated and deflated to adjust the distance between the upper steel plate 9 and the lower steel plate 10. The entire device is practical and has excellent earthquake resistance.

Claims

1. A multi-stage energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall, characterized in that: A vertical concrete retaining wall (1) is cast at the bottom of each side of the rail (17), and a layer of hydrophobic memory sponge (2) is fixed on the inner side of the concrete retaining wall (1) on both sides. The memory sponge (2) is modular, and gaps are left at the joints between the blocks for installing steel bars (4) on the concrete retaining wall (1). At the same time, a single-point displacement meter (3) is installed on the memory sponge (2); In the middle area of ​​the concrete retaining wall (1), a plurality of mutually parallel geogrids (7) are evenly arranged in a direction perpendicular to the concrete retaining wall (1), the geogrids (7) being arranged in a row of two in parallel, a driving shaft (5) and driven shafts (6) located on both sides thereof being fixed in the middle position, one end of the geogrid (7) being hinged to the driven shaft (6), and the other end extending into the concrete retaining wall (1) and being fixed, and a grid displacement meter (8) being also installed on the geogrid (7); A box-shaped earthquake-resistant foundation is provided below the geogrid (7), comprising an upper steel plate (9) and a lower steel plate (10). The upper steel plate (9) and the lower steel plate (10) are connected via limiters (11) on the left and right sides. The limiters (11) control the spacing between the upper steel plate (9) and the lower steel plate (10). A rubber air cushion (16) is provided inside the formed box structure. After the rubber air cushion (16) is inflated, it fits the upper steel plate (9) and the lower steel plate (10). An inflation valve (13) and an air release valve (14) are provided on both sides of the rubber air cushion (16). An elastic element (12) is provided inside the rubber air cushion (16) to assist in maintaining the shape of the rubber air cushion (16). An acceleration sensor (15) is provided on the surface of the upper steel plate (9).

2. The multi-stage energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall according to claim 1 is characterized in that: The elastic element (12) in the rubber air cushion (16) is a shock-absorbing energy-consuming spring.

3. The multi-stage energy-absorbing and shock-absorbing reinforced soil double-sided roadbed retaining wall according to claim 1 is characterized in that: A layer of geomembrane is wrapped on the memory sponge (2).

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