Prefabricated ballast bed

Abstract

The utility model discloses a prefabricated ballast bed, a rubber spring is arranged at the bottom of the prefabricated ballast bed, a notch close to the installation position of the rubber spring at the bottom of the prefabricated ballast bed is formed in the side edge of the prefabricated ballast bed, and a detachable balancing weight embedded in the notch is connected to the prefabricated ballast bed. According to the prefabricated ballast bed, the notches are formed in the side edges of the ballast bed, so that spaces are reserved in the notches, and operators can conveniently replace the rubber springs or add the base plates. And a balancing weight is arranged at the notch part to fill the notch, so that the quality of the ballast bed is conveniently kept to meet the design requirement, and meanwhile, the vibration reduction effect of the ballast bed can be achieved through the balancing weight.

Description

Technical Field

[0001] The utility model relates to the field of rail transit, especially to the roadbed. Background Art

[0002] In traditional rail transit, rails are laid through sleepers. In existing high-speed railway or subway lines, precast roadbeds are usually used to lay rails. The precast roadbed is made by cast-in-place concrete and laid in the track system by splicing. The rails are laid on the precast roadbed.

[0003] With the concern about noise pollution, people have begun to set up various vibration absorption and noise reduction devices in the track system to suppress noise generation. For example, vibration absorbers are coated on the rails, vibration damping pads or spring vibration dampers are set between the roadbed and the foundation. Especially in the precast roadbed, rubber springs are set between the roadbed and the foundation to achieve the effect of vibration reduction and noise reduction. The installation methods of rubber springs generally include two types. One is as disclosed in the Chinese utility model patent document with the publication number CN1707026A, where installation holes are opened on the precast roadbed, and the rubber springs are installed into the roadbed through the installation holes. When adjusting the height of the rubber springs, it is achieved by lifting the roadbed and then adjusting the clamping position of the rubber springs. The other is as disclosed in the publication number CN217810250U, where the rubber springs are set on the foundation by embedding method, and the roadbed is placed on the rubber springs. When adjusting the height of the roadbed, it is usually achieved by adding pads on the rubber springs. To add pads on the rubber springs, the roadbed needs to be lifted and the pads are placed from the bottom. Since the space reserved between the side of the roadbed and the foundation is small, and some rubber spring installation positions are relatively inner, it is extremely difficult to place the pads and the roadbed needs to be moved to other places for replacement. Summary of the Utility Model

[0004] In order to solve the deficiencies in the prior art and provide a precast roadbed that is convenient for replacing the rubber springs under the roadbed or adding pads, the technical solution adopted by the utility model is as follows:

[0005] A precast roadbed, with rubber springs provided at the bottom of the precast roadbed, a notch is provided on the side of the precast roadbed near the installation position of the rubber springs at the bottom of the precast roadbed, and a counterweight block that is embedded in the notch and can be disassembled is connected to the precast roadbed.

[0006] Further, the counterweight block is elastically connected to the precast roadbed.

[0007] Further, the counterweight block is connected to the precast roadbed by bolts, embedded sleeves for bolt connection are provided on the precast roadbed, and an elastic body is provided between the bolts and the counterweight block.

[0008] Further, a gap is reserved between the counterweight block and the precast roadbed.

[0009] Further, an elastomer is provided between the counterweight and the precast roadbed.

[0010] Further, both the counterweight and the notch are trapezoidal.

[0011] Further, a positioning pin (6) capable of being inserted into the central positioning hole of the rubber spring is provided at the bottom of the precast roadbed (1).

[0012] By providing a notch on the side of the roadbed of the precast roadbed, a space is reserved at the notch part for the operator to conveniently replace the rubber spring or add a cushion plate. And a counterweight is provided at the notch part to fill the notch, so as to conveniently keep the quality of the roadbed in line with the design requirements, and at the same time, the vibration reduction effect of the roadbed can be achieved through the counterweight. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the precast roadbed;

[0014] Figure 2 It is a cross-sectional view of the precast roadbed installed in the foundation; Detailed Embodiment

[0015] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and the drawings.

[0016] As Figure 1 shown, a set of notches 1-1 are provided on both sides of the precast roadbed 1, and a counterweight 3 embedded in the notches 1-1 is provided at the notches 1-1. The counterweight 3 is connected to the precast roadbed 1 and can be detached from the precast roadbed 1. As Figure 2 shown, a positioning pin 6 is provided at the bottom of the precast roadbed 1. When the precast roadbed 1 is installed in the foundation A, a rubber spring 2 is further provided between the precast roadbed 1 and the foundation A. A positioning hole is provided at the top of the rubber spring 2 to cooperate with the positioning pin 6, so that the rubber spring 2 is positioned at a specified position under the precast roadbed 1. The rubber spring provides vibration reduction for the precast roadbed 1. Since the rubber spring 2 will undergo elastic deformation under the gravity of the precast roadbed 1 during installation, the height of the precast roadbed 1 cannot be accurately controlled. Therefore, during the installation process, it is necessary to adjust by adding a height-adjusting cushion plate on the rubber spring 2. However, the gap between the edge of the traditional precast roadbed 1 and the foundation is small, and there is no operating space after lifting the roadbed. It is necessary to move the entire precast roadbed 1 away from the foundation A to install the height-adjusting cushion plate. Moreover, during the maintenance and replacement due to the aging of the rubber spring during use, the same operation is also required.

[0017] For the convenience of installation and adjustment, as Figure 1As shown in the figure, a notch 1-1 is provided on the side of the precast track bed 1. The position of the notch 1-1 is close to the installation position of the rubber spring 2, and the number of notches 1-1 matches the number of rubber springs 2. Or, in order to minimize the number of notches 1-1, the notch 1-1 is arranged in the area between two rubber springs 2. To ensure that the weight of the precast track bed 1 meets the standard, a counterweight block 3 connected to the precast track bed 1 is embedded at the position of the notch 1-1. On the one hand, the counterweight block 3 makes up for the weight reduction caused by the notch 1-1 on the precast track bed 1. On the other hand, it makes up for the integrity of the edge of the precast track bed 1 and the sealing performance between the precast track bed 1 and the foundation A. When it is necessary to perform operations at the bottom of the precast track bed 1, only need to lift the precast track bed 1 by a small height and remove the counterweight block 3 from the precast track bed 1. After the notch 1-1 appears, there will be enough space to provide an operating space for the staff.

[0018] As Figure 1 shown above, the counterweight block 3 is connected to the precast track bed 1 through bolts 4. Embedded sleeves are provided on the precast track bed 1 to connect the springs. An elastomer 5 is arranged at the mating position of the counterweight block 3 and the bolt 4, and an elastomer 5 is also arranged between the counterweight block 3 and the precast track bed 1. The elastomer 5 can be made of rubber, polyurethane or other materials, thus forming an elastic connection. When the train passes by, the vibration of the precast track bed 1 is absorbed through the elastomer 5, and the counterweight block 3 also has a certain resonance effect to further suppress the vibration of the precast track bed 1 and reduce noise pollution.

Claims

1. A prefabricated roadbed, the bottom of which is provided with a rubber spring (2), characterized in that: A notch (1-1) is provided on the side of the prefabricated ballast (1) near the installation position of the rubber spring at the bottom of the prefabricated ballast, and a detachable counterweight (3) is connected to the prefabricated ballast (1) and is embedded in the notch (1-1).

2. The prefabricated roadbed according to claim 1, characterized in that: The counterweight block (3) is elastically connected to the prefabricated roadbed (1).

3. The prefabricated roadbed according to claim 2, characterized in that: The counterweight block (3) is connected to the prefabricated ballast (1) via bolts (4); an embedded sleeve for connection with the bolts (4) is provided on the prefabricated ballast (1); and an elastic body (5) is provided between the bolts (4) and the counterweight block (3).

4. The prefabricated roadbed according to claim 1, characterized in that: A gap is reserved between the counterweight block (3) and the prefabricated roadbed (1).

5. A prefabricated roadbed according to claim 1 or 4, characterized in that: An elastic body (5) is arranged between the counterweight block (3) and the prefabricated roadbed (1).

6. The prefabricated roadbed according to claim 1, characterized in that: The counterweight block (3) and the notch are both trapezoidal.

7. The prefabricated roadbed according to claim 1, characterized in that: A positioning pin (6) which can be inserted into the central positioning hole of the rubber spring is arranged at the bottom of the prefabricated roadbed (1).

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