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Damping ballastless track slab

A ballastless track and track slab technology, which is applied in the field of rail transportation, can solve the problems of compressive and flexural strength reduction, compressive and flexural strength reduction, etc., achieve improved vibration damping performance, obvious vibration damping performance, and benefit the environment Effect

Pending Publication Date: 2017-08-29
EAST CHINA JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of rubber concrete’s compressive and flexural strength decline, the present invention proposes a rubber granule pretreatment method, the rubber concrete made of treated rubber granules does not decrease significantly in compressive and flexural strength, but the vibration damping performance is improved obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, a short sleeper vibration-damping ballastless track slab and a short sleeper ordinary concrete ballastless track slab are made.

[0022] The geometric dimensions of the two track slabs are: length 5500cm, width 2500cm, thickness 20cm, each with 14 short sleepers. See attached figure 1 , attached figure 2 .

[0023] Ordinary concrete track slabs are manufactured according to existing construction techniques and procedures.

[0024] The construction process of vibration-damping ballastless track slabs: vertical mold-binding steel bars-weighing 5% equal volume rubber particles (2-4mm in diameter) of river sand-treating the surface of rubber particles with KH560 coupling agent-drying or drying Rubber granules-mix the dried or dried rubber granules into concrete aggregates and mix them-pour rubber concrete on the track slab-pour sleepers with ordinary concrete-cure-form removal.

Embodiment 2

[0026] In this embodiment, the vibration damping performance of the two ballastless track slabs in Embodiment 1 is tested. Including two vibration reduction indicators: Z-direction acceleration vibration level and insertion loss.

[0027] 1. Acceleration vibration level is calculated by the following formula:

[0028]

[0029] in,

[0030] In the formula: a 0 As the reference acceleration, take a 0 for 10 -6 m*s-2;

[0031] Weighted acceleration for frequency domain A, c i is the weighting factor of the i-th 1 / 3 frequency band; a ri is the effective value of the vibration acceleration at the center frequency of the ith 1 / 3 frequency band.

[0032] The test results show the Z-direction acceleration vibration levels of ordinary concrete short-sleeper ballastless track slab and short-sleeper vibration-reducing ballastless track slab at the same position on the track slab, as shown in Table 1 below.

[0033] Table 1. Z-direction acceleration vibration levels of the...

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Abstract

The invention belongs to the technical field of track transportation, and particularly relates to a manufacturing material and structure form of a damping ballastless track slab. A track plate layer of the damping ballastless track slab is manufactured through rubber concrete of which rubber particles are treated, and a sleeper is manufactured through common concrete. The treatment method of the rubber particles comprises the step of using a KH 560 type coupling agent to treat the surface of the rubber particles. The doping quantity of the rubber particles is 5% same-volume substitution river sand. In the damping ballastless track slab prepared through the method, the vibration level of the acceleration in the Z direction of the ballastless track slab prepared through the method is obviously lowered, the vibration level of the vibration to the environment is obviously lowered within most frequency bands, moreover, the damping ballastless track slab has the advantages that the cost is low, manufacturing is simple, the intensity is not obviously lowered, and the later maintenance is simple.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and in particular relates to a vibration-reducing ballastless track slab. Background technique [0002] Rail transit has brought convenience to everyone's travel, but it has also brought a series of vibration environmental problems. In fact, vibration has been listed as one of the seven major environmental hazards internationally. This requires that in the process of urban rail transit construction, we must strictly abide by the relevant national environmental standards, actively take measures to reduce vibration and noise, strive to solve the environmental vibration problems caused by urban rail transit, and strive to achieve the harmony between urban rail transit and the human environment. Harmony. [0003] At present, there are many vibration reduction measures in rail transit in China, such as the use of vibration reduction fasteners, steel spring floating plate tracks, trapezoidal trac...

Claims

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Application Information

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IPC IPC(8): E01B1/00E01B19/00
CPCE01B1/00E01B19/003
Inventor 刘林芽崔夏冰雷晓燕刘全民
Owner EAST CHINA JIAOTONG UNIVERSITY
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