T-shaped vibration reduction protection structure suitable for slope of foundation pit adjacent to existing railway bearing platform

Abstract

The utility model discloses a T-shaped vibration damping protection structure suitable for a slope adjacent to a foundation pit of an existing railway bearing platform, which comprises a limit support plate, a plurality of insertion holes are uniformly distributed on the limit support plate along a straight line, anchor rods are respectively inserted in the insertion holes, trays are fixedly arranged at the top ends of the anchor rods, and the trays are fixedly arranged on the limit support plate. And a prestressed spring is sleeved on the anchor rod between the tray and the limiting support plate. The structure has multifunctional adaptability and can meet the vibration reduction requirements of plane and slope earth surfaces. The plug-in design does not need to damage the original roadbed or earth surface, the construction is convenient, and the safety is high. Through the prestress design and the combination of the flexibility characteristic of the rubber blocks, the T-shaped vibration reduction protection structure can adjust the structural strength and adaptability according to the field requirements, and therefore the vibration reduction requirements under the condition of different soft and hard road surfaces are met. Prefabricated modular production is adopted, the installation efficiency is high, the cost is low, and the method is suitable for temporary engineering. In addition, the structure can be recycled and reused, and high economical efficiency and environmental protection benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration reduction and protection structures, in particular to a "T"-shaped vibration reduction and protection structure suitable for a foundation pit slope adjacent to an existing railway pedestal. Background Art

[0002] The slope of the foundation pit adjacent to the existing railway pedestal is continuously affected by the vibration of the railway operation during the period from the excavation of the foundation pit to the backfilling of the pedestal, and has the characteristics of high vibration intensity and long duration. In addition, the slope of the foundation pit of the pedestal is a temporary slope with simple support measures and poor stability. Therefore, it is necessary to carry out special vibration reduction and protection design for the slope of the foundation pit adjacent to the existing railway pedestal.

[0003] At present, the main methods for foundation pit slope or slope vibration reduction are trenching method and foundation treatment method.

[0004] The disadvantages of the trenching method are that it requires a large construction site, which is often extremely limited or even non-existent near existing railway lines. This makes trenching difficult to implement. Furthermore, trenching can affect the stability of the railway subgrade, increasing potential safety risks, making it unsuitable for use near railways.

[0005] The disadvantages of foundation treatment methods include high costs and long construction periods, such as compaction or grouting. These techniques are primarily designed for permanent slopes or large-scale projects and are not economical or effective for temporary foundation pit slopes. Furthermore, these methods are difficult to implement near railways, as construction disruptions could affect railway operations.

[0006] Existing technologies primarily focus on vibration protection for common slopes, lacking effective solutions specifically for areas adjacent to railways. Vibration propagation in these environments is more complex, and existing methods struggle to balance construction space constraints, time constraints, and vibration reduction effectiveness. Utility Model Content

[0007] In order to solve the above technical problems, the utility model designs a "T"-shaped vibration reduction and protection structure suitable for the slope of the foundation pit adjacent to the existing railway foundation.

[0008] The utility model adopts the following technical solutions:

[0009] A "T"-shaped vibration reduction and protection structure suitable for the slope of a foundation pit adjacent to an existing railway pedestal, including a limit support plate. A plurality of sockets are evenly distributed along a straight line on the limit support plate, and anchor rods are respectively inserted into the sockets. A tray is fixedly installed on the top of the anchor rod, and a prestressed spring is sleeved on the anchor rod between the tray and the limit support plate.

[0010] Preferably, the limiting support plate is made of steel plate.

[0011] Preferably, the anchor rod is a threaded steel rod to increase side friction resistance.

[0012] Preferably, a layer of rubber blocks is attached to the bottom of the limiting support plate.

[0013] Preferably, the anchor rod is a continuous anchor rod with a diameter of 20-25 cm.

[0014] Preferably, the total length of the anchor rod is determined according to geological conditions and can be driven into bedrock or be greater than 10 m.

[0015] Preferably, the spacing between adjacent anchor rods is 80-120 cm.

[0016] This utility model addresses the surface wave vibrations generated by railway operations by analyzing their propagation characteristics and designing an insertable "T"-shaped vibration reduction structure to achieve efficient, economical, and environmentally friendly vibration reduction. The structure utilizes its unique geometry and material properties to absorb and block surface wave vibrations.

[0017] The beneficial effects of the present invention are: (1) Multifunctional adaptability: it can be directly inserted into the surface or slope around the foundation pit and used in areas with more prominent vibration reduction effects; it is equipped with prestressed springs and rubber blocks, which can adapt to different geological conditions (such as loose soil, hard soil layer) and slope shapes, and has high flexibility; it is suitable for narrow construction sites adjacent to existing railways, overcoming the limitations of trenching and foundation treatment on the site; (2) Non-destructive construction: the inserted structure does not damage the original railway roadbed, reduces interference with the normal operation of the railway, and significantly improves safety; there is no need to excavate the foundation pit or perform complex treatment on the roadbed, avoiding damage to the surrounding environment; (3) Efficient construction: the factory-prefabricated "T" type vibration reduction structure is used Standardized production ensures stable product quality; on-site construction only requires the insertion of prefabricated components, which is quick to install and suitable for tight construction periods; reducing equipment investment and the number of construction personnel, further reducing project costs; (4) Economic efficiency and recyclability: After the foundation pit is backfilled, the "T" type vibration reduction structure can be pulled out and reused, significantly reducing long-term project costs; the recycled structure can be used again in other temporary foundation pit projects, realizing resource recycling and in line with the concept of sustainable development; (5) High-efficiency vibration reduction performance: According to the characteristics of surface wave vibration, the "T" type structure transfers vibration from the surface to the deep; the rubber block can increase the contact area between the steel plate and the ground, promoting the conversion of surface vibration to the deep. At the same time, the rubber block can absorb part of the surface vibration energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 yes Figure 1 A bottom view of

[0020] Figure 3 This is a schematic diagram of a usage state of the utility model;

[0021] Figure 4 It is a simulation effect diagram of the simulation frequency vibration state before and after the use of the utility model.

[0022] In the figure: 1. Steel plate, 2. Anchor rod, 3. Tray, 4. Prestressed spring, 5. Rubber block, 6. Train vibration, 7. Vibration wave, 8. "T"-shaped vibration reduction and protection structure, 9. Foundation pit slope, 10. Side friction resistance. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0024] Example: Figure 1 and Figure 2 As shown, a "T"-shaped vibration reduction and protection structure suitable for the slope of a foundation pit adjacent to an existing railway pier is composed of a steel plate 1, an anchor rod 2, a tray 3, a prestressed spring 4, and a rubber block 5. The steel plate has a length a of approximately 2m, a width b of approximately 0.5m, and a thickness c of approximately 2cm. The rubber block is approximately 10cm thick and is made of hard rubber. The anchor rod is a connectable anchor rod with a diameter of 20-25cm. The total length of the anchor rod depends on the geological conditions and can be driven into the bedrock or greater than 10m. A plurality of sockets are evenly distributed along a straight line on the steel plate, and anchor rods are inserted into the sockets. A tray is fixedly installed on the top of the anchor rod, and a prestressed spring is sleeved on the anchor rod between the tray and the limit support plate. The anchor rod is made of threaded steel rod. The spacing between adjacent anchor rods is 80-120cm.

[0025] The operating principle of this utility model is: Figure 3 As shown in the figure, when a train passes, the train vibration energy mainly diffuses outward through surface waves. The impact depth of surface waves is usually 1-2 times the wavelength below the ground. Since the depth of the foundation pit of the pedestal is usually shallow (usually less than 5m), the impact depth range of surface waves highly overlaps with the range of the foundation pit slope of the pedestal. Therefore, the vibration caused by the operation of the adjacent railway has a greater impact on the foundation pit slope of the pedestal, and this impact lasts for a long time.

[0026] When surface waves represented by Rayleigh waves propagate, the free surface vibration mode manifests as an elliptical counterclockwise vibration. After the "T"-shaped vibration reduction and protection structure 8 is laid out, the surface soil is no longer a free surface under the constraint of prestress, and it is difficult to form an elliptical counterclockwise vibration. Instead, through the action of side friction resistance 10, the surface vibration wave 7 propagates along the anchor rod to the deep foundation, thereby reducing the damage to the shallow foundation pit slope 9.

[0027] like Figure 4 As shown, it is a simulation effect diagram of the simulation frequency vibration state before and after the use of the utility model. Through the effect comparison, it can be seen that after the use of the utility model, the harm to the shallow foundation pit slope is significantly reduced.

[0028] The embodiment described above is only a preferred solution of the present invention and does not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A "T" type vibration reduction and protection structure suitable for the slope of a foundation pit adjacent to an existing railway foundation, characterized by: It includes a limiting support plate with multiple jacks evenly distributed along a straight line. Anchor rods are respectively inserted into the jacks. A tray is fixedly installed on the top of the anchor rods. A prestressed spring is sleeved on the anchor rods between the tray and the limiting support plate.

2. The "T" type vibration reduction and protection structure suitable for the slope of foundation pit adjacent to an existing railway foundation according to claim 1 is characterized in that: The position limiting support plate is made of steel plate.

3. The "T" type vibration reduction and protection structure suitable for the slope of foundation pit adjacent to an existing railway foundation according to claim 1 is characterized in that: The anchor rod is a threaded steel rod.

4. The "T" type vibration reduction and protection structure suitable for the slope of foundation pit adjacent to an existing railway foundation according to claim 1 is characterized in that: A layer of rubber blocks is attached to the bottom of the limiting support plate.

5. The "T" type vibration reduction and protection structure suitable for the slope of foundation pit adjacent to an existing railway foundation according to claim 1 is characterized in that: The anchor rod is a continuous anchor rod with a diameter of 20-25 cm.

6. The "T" type vibration reduction and protection structure suitable for the slope of foundation pit adjacent to an existing railway foundation according to claim 1 is characterized in that: The total length of the anchor rod is determined according to geological conditions and can be driven into bedrock or be greater than 10m.

7. The "T" type vibration reduction and protection structure suitable for the slope of foundation pit adjacent to an existing railway foundation according to claim 1 is characterized in that: The spacing between adjacent anchor rods is 80-120 cm.

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