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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 other hand, in order to overcome the reaction force transmitted from the track to the bridge piers and abutments of the bridge, it is necessary to increase the structural size of the bridge piers and abutments to meet the force requirements. Increased investment

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

Embodiment 1

[0051] Embodiment 1: Embodiment 1 is a three-layer structure. The cloth film layer of the upper layer is a composite film of PU film and PA cloth arranged in sequence from top to bottom, and 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 in sequence from top to bottom.

[0052] The advantage of embodiment 1 is that (1) the coefficient of friction of PA and HDPE on 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 on the grinding surface; (2) as a It is an elastomer material with excellent performance. The PU film has good shear resistance, compression resistance, fatigue resistance, creep resistance and elastic recovery performance. Free expansion and contraction without material damage due to shear and creep;

[0053] (3) PU membrane has strong bondi...

Embodiment 2

[0056] Embodiment 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 in sequence from top to bottom, and the cloth film layer of the lower layer is formed from the upper layer A composite film of PA cloth and PU film arranged in sequence.

[0057] The advantage of embodiment 2 is: it has some advantages of embodiment 1, and the price is much lower than the former, and because the sliding film is bonded to the polyester filament geotextile, the cement can be poured directly on the polyester filament geotextile, and the sliding film It can be limited without sliding out. The industrial preparation technology of HDPE and polyester filament geotextiles is mature, and the construction is relatively convenient.

[0058] The disadvantage of embodiment 2 is that it is similar to embodiment 1. In addition, due to the lack of the free sliding layer of the embodiment 1 scheme, the wear o...

Embodiment 3

[0060] Embodiment 3 is a three-layer structure, and 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 geomembranes that are bonded together 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. The performance indicators of polyester filament composite polyethylene geomembrane are shown in Table 3.

[0061] The advantages of Embodiment 3 are: (1) The friction coefficient between polyester filament geotextile and HDPE is only 0.10 (theoretical value), although it is higher than polyethylene film and PA cloth fric...

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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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