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Polyurethane railway track bed and its production method and application

A polyurethane and polyurethane layer technology, applied in the field of polyurethane, can solve problems such as hidden dangers of railway transportation, shorten the maintenance period of ballast bed, and reduce physical and mechanical properties, and achieve the effects of improving service life and reducing vibration and noise reduction.

Inactive Publication Date: 2012-07-11
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, using the above method to cast polyurethane ballast bed on site has strict requirements on the environment of the pouring site. When the environment of the construction site where the railway subgrade is laid is wet, drying equipment must be used to pre-dry the railway track bed.
In addition, the polyol materials selected by the method are mostly limited to polyether polyols, because the polyurethane foam based on polyester polyols is easily hydrolyzed, and its physical and mechanical properties after hydrolysis will be greatly reduced, thereby greatly shortening the maintenance cycle of the ballast bed, otherwise It will bring huge hidden dangers to the safety of railway transportation.

Method used

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  • Polyurethane railway track bed and its production method and application
  • Polyurethane railway track bed and its production method and application
  • Polyurethane railway track bed and its production method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0049] According to the method for preparing polyurethane railway track bed provided by the present invention, an appropriate amount of ballast is put into the mold, and the ballast is compacted with a vibrator or a press until the relevant requirements of the railway ballasted track are met, and then the first reaction system is poured into the mold In, reaction, foaming, curing and molding to obtain a molded polyurethane layer.

[0050] The mold may be a mold used in the prior art for preparing molded polyurethane, and the material of the mold is preferably but not limited to metal and epoxy resin.

[0051] The first reaction system, see first reaction system .

[0052] Before pouring the first reaction system into the mould, a drainage mat and / or ballast mat with a thickness of 2-30 mm can also be laid on the bottom of the mould.

[0053] The drainage mat and / or ballast mat is preferably but not limited to rubber-based granular pressure-bonded material, rubber-based stri...

Embodiment 1

[0134] Use the HK 1250 conventional high-pressure pouring machine to inject the components Desmodur18IF19 and Bayflex 12BX012 of the first reaction system into a mold with ballast, drainage pads and structural reinforcement materials according to the dosage listed in Table 1-1 (mold temperature 35- 50°C), react, foam, and cure to form a molded polyurethane layer. The physical and mechanical properties of the obtained molded polyurethane layer are listed in Table 1-1.

[0135] Table 1-1

[0136]

[0137] Example 1 illustrates that the hardness and rigidity of the molded polyurethane layer prepared according to the method provided by the present invention are relatively high. Foam density over 400kg / m 3 The molded polyurethane track bed can be used as a transition section between high rigidity ballastless track bed and low stiffness ballasted track bed, or directly applied to ballasted track polyurethane molded track bed.

Embodiment 2

[0139] Use PU20J-R / Y conventional low-pressure injection machine to inject the first reaction system with the ingredients and dosage listed in Table 2-1 into a mold with ballast, drainage pad, and structural reinforcement materials (mold temperature: 35-50°C) , react, foam, and cure to form a molded polyurethane layer. The physical and mechanical properties of the obtained molded polyurethane layer are listed in Table 2-1.

[0140] table 2-1

[0141]

[0142]

[0143] Example 2 illustrates that the hardness and stiffness of the molded polyurethane track bed can be changed by changing the amount of the isocyanate component, so as to be suitable for the actual needs of different types of railway track beds.

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Abstract

The invention relates to a polyurethane railway track bed, a production method of the polyurethane railway track bed and a railway facility comprising the polyurethane railway track bed. The polyurethane railway track bed comprises a railway subgrade and a moulded polyurethane layer, and the moulded polyurethane layer is disposed on the railway subgrade. The moulded polyurethane layer is laid on the railway subgrade, so that the strict requirement of the field polyurethane pouring method on field pouring environment can be omitted, and the moulded polyurethane layers different in density and / or hardness can be produced and laid on the railway subgrade according to actual needs of different railway track beds.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a polyurethane railway track bed, a preparation method thereof and railway facilities comprising the polyurethane railway track bed. Background technique [0002] The railway track bed often refers to the ballast layer laid under the sleepers and above the roadbed. It is the foundation of the track frame and its main function is to support the sleepers and evenly distribute the huge railway vehicle loads from the rails and sleepers to the bed of the roadbed. Reduce roadbed deformation and ensure driving safety. In addition, the ballast also has the functions of buffering and shock absorption. The ballasted railway track bed has excellent versatility and very low construction cost, so it can be used in a wide range of applications. [0003] The maintenance cost of the ballasted railway track bed is very high. In addition to regular maintenance, it is necessary to regularly use the ou...

Claims

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Application Information

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IPC IPC(8): E01B1/00E01B2/00C08G18/48C08G18/66C08G18/42C08G101/00
CPCC08G2101/0058C08G18/6674C08J9/0085C08G18/48E01B1/001C08J9/146C08G2350/00C08J2375/04C08G18/42C08G2101/0083C08G18/10C08J9/0066C08G2101/0066C08G18/4072C08G2110/0058C08G2110/0066C08G2110/0083C08G18/664
Inventor 张晨曦孙刚沈怡赵辉
Owner COVESTRO DEUTSCHLAND AG
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