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Method for manufacturing sleepers for use in rail superstructures

A technology for sleepers and rails, applied in the field of sleepers formed by plastic-sand-mixture, can solve the problems of lack of elasticity, non-elasticity, heavy weight, etc., and achieve the effect of low price and simple structure

Active Publication Date: 2020-09-29
VOSSLOH WERKE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is heavy and inelastic
Lack of elasticity necessitates additional measures to achieve the required flexibility in the corresponding rail fixing points

Method used

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  • Method for manufacturing sleepers for use in rail superstructures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The present invention is further described below according to the examples.

[0038] Quartz sand is provided for the production of cuboidally elongated sleepers for the superstructure of gravel track beds in the conventional manner. The bulk density of the sand is about 1.9g / cm 3 , the Mohs hardness is 7 and the average particle size of the sand particles is 0.1-<0.5mm.

[0039] Likewise, plastic granules are provided which consist of a mixture of polypropylene plastic granules (PP granules). The melt flow index of PP plastic particles measured under the conditions of 230°C and 2.16kg load is greater than 20.

[0040] Before being mixed with the plastic granules, the sand is heated to 220° C. by means of a heated wick immersed in it and heated by means of thermal oil. In contrast, the temperature of plastic pellets is equal to room temperature.

[0041] The hot sand is then mixed with plastic pellets. The sand and plastic granules are dosed in such a way that the s...

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Abstract

The invention relates to a method which makes it possible to manufacture sleepers for track superstructures with optimized performance properties in an operationally reliable and cost-effective manner. For this purpose, the method according to the invention has the following working steps: a) providing a mixture consisting of 10-60% by mass of heat-deformable plastic particles and as the remainder a bulk density of 1.4-2.0 g / cm 3 b) the mixture is heated to a temperature of 150-200° C.; c) the mixture is filled into a pressing mold forming a sleeper; d) in the mold with a pressing pressure of 1-5 MPa measured inside the mixture to be less than or equal to Press the mixture with a pressing time of 60 min; e) release the sleeper from the mould.

Description

technical field [0001] The invention relates to a method for producing sleepers molded from a plastic-sand mixture for use in track superstructures. Background technique [0002] In this document, references to standards and similar provisions always refer to the version used at the time of filing this application, unless otherwise stated. [0003] The track over which a rail vehicle travels is part of the track superstructure and consists of the rails over which the wheels of the rail vehicle roll, the sleepers which carry the rails and hold them in place, and the rail fixings by which the rails are secured on the sleeper. In this case, the sleepers are usually supported on a gravel track bed ("gravel track bed superstructure") or on a hard substrate ("hard track"), for example made of cement slabs or the like. [0004] In use, sleepers are subjected to high loads. Not only must they absorb the weight of the guide rail and the rail vehicle, but also the high dynamic load...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/04C04B14/06E01B3/36E01B3/44B29C43/00
CPCC04B26/045C04B14/06E01B3/44B29K2509/00B29L2031/06B29C43/02B29C43/52B29C43/003C04B40/0085C04B40/0259C04B20/04C04B20/0076B29K2023/12B29K2023/06B29B13/02B29K2105/16
Inventor 温弗里德·博斯特林阿德里安·贝德纳尔奇克尼古拉斯·施罗德
Owner VOSSLOH WERKE GMBH
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