Sliding layer for bridge trackway longitudinal spacer assembly

A technology of longitudinal isolation and sliding layers, which is applied in the direction of bridges, bridge construction, bridge parts, etc., can solve the problems of increasing bridge piers, increasing track costs, increasing masonry volumes of bridge piers and abutments, etc., and achieves low friction consumption and high friction coefficient small effect

Active Publication Date: 2008-03-12
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the setting of the temperature regulator makes the track a weak link in this area, in order to ensure driving safety, it is necessary to increase the maintenance and repair work of the track, so the cost of the track continues to increase over time
On the o

Method used

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  • Sliding layer for bridge trackway longitudinal spacer assembly
  • Sliding layer for bridge trackway longitudinal spacer assembly

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] Example 1: Example 1 has a three-layer structure. The cloth film layer of the upper layer is a composite film of PU film and PA cloth arranged sequentially from top to bottom. The sliding film of the middle layer is an HDPE sliding film. The cloth film layer of the lower layer is a composite film of PU film and PA cloth arranged sequentially from top to bottom.

[0052] The advantages of Example 1 are that (1) the friction coefficient of PA and HDPE to the grinding surface is only 0.066 (theoretical value), which can better meet the requirements of the sliding layer material on the friction performance of the cloth-film to the grinding surface; (2) as a This kind of elastomer material with excellent performance, PU film has good shear resistance, compression resistance, fatigue resistance, creep resistance and elastic recovery performance. After it is bonded to concrete as a whole, it can be deformed with the deformation of the isolation board or beam. Free expansion and co...

Example Embodiment

[0055] Example 2:

[0056] Example 2 is a two-layer structure. The cloth film layer of the upper layer is a composite film of polyester filament geotextile and HDPE sliding film arranged sequentially from top to bottom, and the cloth film layer of the lower layer is a composite film of polyester filament geotextile and HDPE sliding film. The composite film of PA cloth and PU film set in sequence below.

[0057] The advantage of embodiment 2 is that it has some advantages of embodiment 1, and the price is much lower than the former. Because the sliding film is bonded with polyester filament geotextile, cement can be poured directly on the polyester filament geotextile. The sliding film Can be limited without sliding out. The industrialized preparation process of HDPE and polyester filament geotextile is mature, and the construction is relatively convenient.

[0058] The disadvantage of Example 2 is that it is similar to Example 1. In addition, due to the lack of the free sliding la...

Example Embodiment

[0059] Example 3:

[0060] Example 3 is a three-layer structure. The cloth film layer of the upper layer is a polyester filament composite polyethylene geomembrane, referred to as a composite geomembrane, which includes polyester filament geomembrane which is adhered and arranged sequentially from top to bottom. Cloth, PE waterproof layer, and polyester filament geotextile; the sliding film of the middle layer is HDPE sliding film; the cloth of the lower layer is polyester filament geotextile. The thickness of the polyester filament geotextile is 2-2.5mm, the thickness of the HDPE sliding film is 1-1.5mm, and the thickness of the PE waterproof layer is 0.3-0.6mm. Table 3 shows the performance indexes of polyester filament composite polyethylene geomembrane.

[0061] The advantages of Example 3 are: (1) The friction coefficient of polyester filament geotextile and HDPE to the grinding surface is only 0.10 (theoretical value). Although it is higher than the friction coefficient of p...

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Abstract

The invention provides a slide layer for longitudinal isolation devices on bridge tracks. The slide layer is arranged below a longitudinal partition wall between a track and a bridge; the slide layer is positioned in the direction of the bridge length; both ends of the slide layer can be expanded to limit table across an abutment; the width of the slide layer is bigger than that of the track; the slide layer comprises an top-arranged film layer, an intermediate sliding film and a bottom-arranged film layer; the top face of the top-arranged film layer of the slide layer is adhered to the bottom face of the longitudinal partition wall; the bottom face of the bottom-arranged film layer is stuck to the top face of the bridge beam body. The invention has advantages of anti-friction, tensile resistance, anti-freezing, creep-resisting, anti-corrosion and having weather ability performances; meanwhile, the invention can meet the requirements for lower friction factor and low friction loss. Besides, the invention also has advantages of perfect processing performance, being economic and practical and low price. Therefore, the invention meet requirements of bridge track longitudinal isolation devices for slide layers.

Description

technical field [0001] The invention belongs to the field of railway bridge and track engineering, in particular to a sliding layer used for a longitudinal isolation device of a bridge track. Background technique [0002] In the current railway bridge track engineering, as shown in FIG. 1 , a steel rail 4 in the track supported by a steel rail fulcrum 5 in the track is provided above the bridge. The ends of the whole bridge girder body are supported on the abutment 2, and the middle part of the bridge girder body is supported on the pier 9. Under temperature changes or train loads, bridges and tracks interact with each other. When the span of the bridge is greater than 120m, the force transmitted by the bridge to the track is large, so that the longitudinal force and displacement of the track exceed the rated value, resulting in track damage, affecting driving safety, and causing serious consequences. In order to solve this problem, the common method adopted at present is ...

Claims

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Application Information

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IPC IPC(8): E01D19/08E01D19/12
Inventor 刘名君颜华朱颖王琪姚力田春香
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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