Control technology of elastic hybrid lightweight ballast bed for subway shock absorption and vibration isolation

Abstract

The invention discloses a subway shock reduction vibration isolation elastic mixed light track bed control process. Due to the fact that an elastic light concrete layer material comprises a light material containing EPS particles, in the composite track bed forming construction process, a vibrorammer or a vibrating rod is required to compress concrete, but in the vibrating process, the EPS particles are easy to float upwards, and strength uniformity and quality control over an elastic mixed light track bed are affected. To solve the problem, in the concrete forming process, polyacrylamide of different ratios is added according to different volume ratios of the concrete and the EPS particles so as to control floating upwards of the EPS particles. By means of the process, the subway shock reduction vibration isolation elastic mixed light track bed can be obtained, and an obvious shock reduction vibration isolation effect is achieved.

Description

technical field [0001] The invention relates to a control technology of subway shock-absorbing, vibration-isolation, elastic hybrid light track bed, which is a shock-absorbing and vibration-isolation subway hybrid elastic light track bed. Background technique [0002] With the acceleration of my country's subway construction and the continuous increase of operating mileage, ensuring the harmony and safety of subway operation is not only an important livelihood project, but also a strategic project for urban development of green economy, which is related to everyone's travel safety. In fact, many potential safety hazards and hazards have appeared in the operation of subways in cities such as Shanghai and Nanjing, such as suspension of operation for maintenance after accumulated settlement and differential settlement seriously exceeding the standard, vibration of subway trains aggravates the danger of water seepage and mud leakage in the lining structure, and even Problems suc...

AI Technical Summary

Problems solved by technology

Due to the complex working conditions faced by shallow-buried subways, on the one hand, the shallow soil layers are mostly Quaternary strata, with many weak soil layers, and the variation of physical and mechanical properties of the soil layers is very complicated; the subway line is long, passing through different soil layers or geology At the same time, there will be large rivers and lakes. The subway structure of the large rivers and lakes will inevitably bear high water pressure, and there will be pressurized groundwater. The environment is very complicated

Therefore, the shallow buried subway brings the following problems: ① the cumulative deformation of the surrounding soft soil is difficult to control, ② the impact of the vibration of the subway train increases the adverse effects of the accumulated deformation and the durability and anti-seepage of the lining structure

[0008] 4. Adopt suitable ballast bed and track structure type, increase the elasticity of the track, and add a rubber backing plate with a small static stiffness coefficient, the vibration attenuation can reach 5-10dB, but the service life is short, the later vibration damping effect is poor, and it cannot be replaced

The basic ballast bed in the general section of the subway project does not adopt any shock-absorbing measures, but only adopts shock-absorbing facilities in the areas where hospitals, workshops, and institutions that require vibration reduction are located, such as floating slab ballast, elastic short sleeper integral ballast Rails, rubber pads and other measures are used for shock absorption, but these measures are difficult to achieve a good shock absorption and vibration isolation effect, the vibration attenuation is 6-10dB, and the service life is limited

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