CN105036618A - Preparation method of metro damping and vibration-isolating ballast bed lightweight concrete - Google Patents

Abstract

The invention discloses a preparation method of metro damping and vibration-isolating ballast bed lightweight concrete. The lightweight concrete is formed by blending an EPS particle light material, stone, sand, cement and some additives according to a certain proportion. Blending is performed by determining the volume ratio of concrete to EPS particles in a lightweight concrete layer according to the design requirement of damping and vibration-isolation of along the line of a metro, wherein the blending volume ratio is 3:2, 3:1 or 4:1; the EPS particles have the particle size of 1 to 3 mm, and the density of 12 to 15 kg/m<3>. According to the method, in the forming process of the lightweight concrete, a certain proportion of high-performance poly hydroxy acid water reducing agent and silicon powder are added according to different volume ratios of the concrete to the EPS particles for ensuring the strength quality of the lightweight concrete. According to the blending method, the lightweight concrete needed by a damping and vibration-isolating metro mixed and elastic light ballast bed can be obtained, and damping and vibration isolation are realized.

Description

A kind of preparation method of subway damping vibration-isolating railway roadbed light weight concrete

Technical field

The present invention relates to subway damping vibration-isolating light weight concrete mixing equipment and technique, is a kind of preparation method of subway damping vibration-isolating railway roadbed light weight concrete.

Background technology

Along with quickening, operation the continuing to increase of mileage of China's subway construction speed, guarantee safety of subway operation, be an important people's livelihood engineering, be also the strategic engineering of urban development green economy, be related to everyone safety.In fact, many potential safety hazards and harm has been there is in the city underground operations such as Shanghai and Nanjing, to stop transport after cumulative settling, relative settlement severe overweight as runed maintenance, subway train vibration makes liner structure occur, and mud harm aggravation is leaked in infiltration, even occur that the periphery soil body and lining cutting such as to be come to nothing at the problem, serious threat is to urban track traffic operation security, and this is must facing challenges in urban rail transit construction.In addition, it is also new complaint problem that subway train vibration disturbs residents, the vibration that Subway Train Operation in Existed Subway causes outwards is propagated by surrounding formation, brings out the secondary vibration of buildings further, the structural safety of buildings and the work of resident and daily life is all created to the impact of certain degree.

Occur that these problems have its cause specific, it is determined by the shallow overburden subway feature of China.The buried depth of China's subway is mostly at about 15m, belong to shallow embedding subway, the work of the vibration effect subway subjective reflection produced when shallow embedding subway train runs and life, simultaneously because shallow surface is mostly Quaternary system soft soil horizon, subway train vibration long term, cause the accumulated deformation severe overweight of subway periphery soft layer, have influence on the safe operation of subway, even produce harm, if the sedimentation of Shanghai Metro Line 1 cumulative maximum is close to 30cm, annual maximum settlement difference reaches 3cm, the safe operation of serious threat subway, now can only speed limit operation, reduce the efficiency of operation of subway.Sankt Peterburg subway Line 1 " forest " stand and " brave square " stand between running tunnel pass through Neva paleo-streams, a series of accident is there occurs after construction period and 1975 put into effect, later stage tunnel lining structure seepage, and a large amount of Sand, cause land subsidence, tunnel deformation, structure havoc, nineteen ninety-five stops train operation the most finally.

In recent years, China's subway transport system fast development, after Beijing, Shanghai, Guangzhou, Line of Nanjing Subway are opened, has again nearly 40 cities start or plan to build subway or light rail.Because city underground all runs through city commercial centre and intensive residential quarter, the impact that Adjacent Buildings living environment along the line produces be can not be ignored.Subway adopts solid concrete roabed structure usually, and for increasing the elasticity of track, rail fastening adopts two elastic layer design, namely between rail and sleeper are used, all establishes the rubber bearing that Static stiffness coefficient is less under fastener iron chair.

Although subway glissando obtains certain effect at present, long-term periodic vibration causes the accumulation of the ground under subway to become distortion and constantly increases, and has threatened the safe operation of subway, and has considerably increased operation maintenance cost.

In prior art, usual railway roadbed adopts the concrete depositing of C35, belongs to rigidity railway roadbed, there is no any attenuation to train vibration.Subway engineering does not all adopt any glissando at the basic railway roadbed of common interval section, just adopt vibration damping facility in regions, position such as hospital, the factory building having damping requirements, offices, as damping is carried out in the measures such as floating slab railway roadbed, elastic short rail sleeper formula monolithic roadbed track, rubber bearing, but these measures are difficult to the damping vibration-isolating effect reached, vibration damping 6-10dB, work-ing life is limited.

Summary of the invention

Technical problem: in order to overcome the deficiencies in the prior art, the invention provides a kind of preparation method of subway damping vibration-isolating railway roadbed light weight concrete, obtains a kind of subway mixing light railway roadbed of damping vibration-isolating, have obvious damping vibration-isolating effect.

Technical scheme: for achieving the above object, the technical scheme that the preparation method of a kind of subway damping vibration-isolating railway roadbed light weight concrete of the present invention adopts comprises the following steps:

1). carry out mix according to the volume ratio of concrete and EPS particle in the design requirements determination light weight concrete layer of subway damping vibration-isolating along the line, mix volume ratio is 3:2,3:1 or 4:1; The particle diameter of EPS particle is 1 ~ 3mm, and density is 12 ~ 15kg/m ³;

2). according to step 1) EPS particle is carried out volume metering for the volume ratio determined and concrete associated materials is weighed respectively, considers that EPS particle is relatively lighter, first carrying out the First Astronautic Research Institute for Measurement and Test needs EPS volume to drop into storehouse of mixing, and EPS granule measurement adopts under meter to control; And then carry out cement, sand, building stones, the weighing of water, and drop into storehouse of mixing respectively, and carry out mix;

3). light weight concrete is because being added with EPS particle, and workability during mix is poor, for increasing its workability, need add a certain proportion of high-performance poly hydroxy acid water reducer; Be specially: when the volume ratio of concrete and EPS particle is 3:2, the weight of water reducer is the 0.9-1.0% of cement weight; When the volume ratio of concrete and EPS particle is 3:1, the weight of water reducer is 0.8% of cement weight, and when the volume ratio of concrete and EPS particle is 4:1, the weight of water reducer is 0.7% of cement weight;

4). water reducer adds when light weight concrete mix, but can not add with water simultaneously;

5). light weight concrete adopts mixing building to carry out mix, the basis of conventional mixing building increases additivated opening for feed and EPS particulate charge mouth simultaneously, is furnished with the volume that volumetric flow meter carries out control EPS simultaneously;

6). uniform for mix light weight concrete is transported to scene and builds, need in transit to stir at a slow speed.

Beneficial effect: the preparation method of a kind of subway damping vibration-isolating railway roadbed light weight concrete provided by the invention, to guarantee that the mixing light concrete needed for subway vibration damping and vibration isolation compound railway roadbed is able to apply in engineering, ensure that vibration damping and vibration isolation compound railway roadbed can be implemented, can effectively intercept and reduce the liner structure of transmission ofenergy to subway of train vibration like this, and pass in the foundation soil body of periphery by liner structure, extraneous vibration produced to the buildings on earth's surface and subway foundation or causes secondary vibration, so that having an impact and even endanger.

Embodiment

The preparation method of a kind of subway damping vibration-isolating railway roadbed light weight concrete of the present invention comprises the following steps:

1). carry out mix according to the volume ratio of concrete and EPS particle in the design requirements determination light weight concrete layer of subway damping vibration-isolating along the line, mix volume ratio is 3:2,3:1 or 4:1; The particle diameter of EPS particle is 1 ~ 3mm, and density is 12 ~ 15kg/m ³;

2). according to step 1) EPS particle is carried out volume metering for the volume ratio determined and concrete associated materials is weighed respectively, considers that EPS particle is relatively lighter, first carrying out the First Astronautic Research Institute for Measurement and Test needs EPS volume to drop into storehouse of mixing, and EPS granule measurement adopts under meter to control; And then carry out cement, sand, building stones, the weighing of water, and drop into storehouse of mixing respectively, and carry out mix;

3). light weight concrete is because being added with EPS particle, and workability during mix is poor, for increasing its workability, need add a certain proportion of high-performance poly hydroxy acid water reducer; Be specially: when the volume ratio of concrete and EPS particle is 3:2, the weight of water reducer is the 0.9-1.0% of cement weight; When the volume ratio of concrete and EPS particle is 3:1, the weight of water reducer is 0.8% of cement weight, and when the volume ratio of concrete and EPS particle is 4:1, the weight of water reducer is 0.7% of cement weight;

4). water reducer adds when light weight concrete mix, but can not add with water simultaneously;

5). light weight concrete adopts mixing building to carry out mix, the basis of conventional mixing building increases additivated opening for feed and EPS particulate charge mouth simultaneously, is furnished with the volume that volumetric flow meter carries out control EPS simultaneously;

6). uniform for mix light weight concrete is transported to scene and builds, need in transit to stir at a slow speed.

Claims (1)

1. a preparation method for subway damping vibration-isolating railway roadbed light weight concrete, is characterized in that: comprise the following steps:

1). carry out mix according to the volume ratio of concrete and EPS particle in the design requirements determination light weight concrete layer of subway damping vibration-isolating along the line, mix volume ratio is 3:2,3:1 or 4:1; The particle diameter of EPS particle is 1 ~ 3mm, and density is 12 ~ 15kg/m ³;

2). EPS particle is carried out volume metering to the volume ratio determined according to step 1) and concrete associated materials is weighed respectively, considers that EPS particle is relatively lighter, and first carrying out the First Astronautic Research Institute for Measurement and Test needs EPS volume to drop into storehouse of mixing, and EPS granule measurement adopts under meter to control; And then carry out cement, sand, building stones, the weighing of water, and drop into storehouse of mixing respectively, and start mix;

3). light weight concrete is because being added with EPS particle, and workability during mix is poor, for increasing its workability, need add a certain proportion of high-performance poly hydroxy acid water reducer; Be specially: when the volume ratio of concrete and EPS particle is 3:2, the weight of water reducer is the 0.9-1.0% of cement weight; When the volume ratio of concrete and EPS particle is 3:1, the weight of water reducer is 0.8% of cement weight, and when the volume ratio of concrete and EPS particle is 4:1, the weight of water reducer is 0.7% of cement weight;

4). water reducer adds when light weight concrete mix, but can not add with water simultaneously;

5). light weight concrete adopts mixing building to carry out mix, the basis of conventional mixing building increases additivated opening for feed and EPS particulate charge mouth simultaneously, is furnished with the volume that volumetric flow meter carries out control EPS simultaneously;

6). uniform for mix light weight concrete is transported to scene and builds, need in transit to stir at a slow speed.