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Determination method of anti-pull strength resistance of embedded parts in railway fastening system

A railway fastener and pullout strength technology, which is applied in the field of determining the pullout strength resistance of embedded parts in the railway fastener system, can solve the problems of damage to nylon sleeves and sleepers, increase the workload of track maintenance, and achieve safety assurance , prolong life, and ensure safety

Active Publication Date: 2018-04-27
洛阳双瑞橡塑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the anchor bolts of this fastener system are connected with the nylon sleeves embedded in the sleeper or ballast bed, the anchor bolt system is fastened and disassembled many times and under the action of high dynamic force and high stress under the operating load, it is easy to cause the nylon The damage of bushings and sleepers greatly increases the workload of track maintenance

Method used

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  • Determination method of anti-pull strength resistance of embedded parts in railway fastening system
  • Determination method of anti-pull strength resistance of embedded parts in railway fastening system
  • Determination method of anti-pull strength resistance of embedded parts in railway fastening system

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Embodiment 1

[0029] The first embodiment mainly illustrates the method for determining the pullout strength and resistance of PANDROL pre-embedded iron seat type boltless fasteners.

[0030] (1) Stress analysis on the spring bar:

[0031] Pandrol fast clip fastening system Each set of fastenings consists of two clips that are fastened on both sides of the rail foot respectively, and the fastening force of each clip is marked as F c , then the vertical restraint resistance F of the fastener system x is the buckle pressure F of a single clip c 2 times of , namely:

[0032] f x = 2F c (1)

[0033] The force of the spring bar is as figure 1 and figure 2 As shown, the buckle point of the elastic strip is subjected to the upward force and the buckle force is F c The size is equal and the direction is opposite, and the heel of the elastic bar is supported by the elastic bar seat N c / 2, the restraining force of the outer branch of the spring bar F / 2, F in the state of force balance c ...

Embodiment 2

[0057] The second embodiment is a method for determining the pullout strength and resistance of Vossloh bolt fasteners.

[0058] The same as the method for stress analysis of a pair of fasteners in the embodiment, the fastening pressure of each elastic strip on both sides of the rail foot is F c , the force of the spring bar is as Figure 5 As shown, the buckle point of the elastic strip is subjected to the upward force and the buckle force is F c The size is equal and the direction is opposite, and the heel of the elastic bar is supported by the elastic bar seat N c / 2, the binding force of the outer branch of the spring bar F / 2, the pulling force of each embedded casing F s / 2, F in the state of force balance c , N c and the relation of F is:

[0059] f c +N c =F b (8)

[0060] f c ·s 1 =N c ·s 2 (9)

[0061] N c – The total bearing force of the heel of the elastic seat elastic;

[0062] f b – clamping force of clip bolts;

[0063] the s 1 – the lateral ...

Embodiment 3

[0077] 1) The method for determining the pullout strength and resistance of the embedded part of the bottom plate fastener in the third embodiment.

[0078] Since the bottom plate rigidly connects the crimping system on both sides of the rail, it effectively balances the crimping pressure and various restraint resistances, such as the crimping force of the spring bar and the reaction force from the cushion under the rail to the rail surface; the supporting force of the spring bar base and the elastic bar limit constraints, etc. The pullout strength resistance of the bottom plate fastener is usually connected in series by two parts, the elastic strip system and the anchor bolt system. The design of the anchor bolt system needs to ensure the constraints and strength requirements of the fastener system with six degrees of freedom in three directions. In order to ensure that the vertical resistance is usually not less than the buckle pressure of the elastic strip, the pretightenin...

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Abstract

The invention discloses a determination method of anti-pull strength resistance of embedded parts in a railway fastening system. The determination method comprises the following steps that (1), vertical restraint resistance Fx of the railway fastening system is obtained; (2), force analysis of the fastening system is carried out to obtain the relationship Fs=[lambda]Fx between the vertical resistance Fs of embedded parts and the vertical constraint resistance Fx under static load, and [lambda] is an actually obtained parameter value; (3), suitable safety factor n is selected based on a force condition of the embedded parts of the fastening system and actual needs of a project; and (4), the anti-pull strength resistance of the embedded parts in the railway fastening system is determined asFp=n[lambda]Fx; and a reliable gist is provided to the determination of the railway design based on the determination method of anti-pull strength resistance of embedded parts in the railway fasteningsystem, and guarantee is provided for the safety of railway transportation.

Description

technical field [0001] The invention relates to the technical field of railway track protection, in particular to a method for determining the pullout strength resistance of embedded parts of a railway fastener system. Background technique [0002] The existing diversification of railway fastener systems in railway transportation improves the stability of the railway system and provides greater possibilities for the development of the railway. Fasteners in rail transit railway track systems are key components for connecting and fixing rails and ballast beds or sleepers. As early as the 1960s, the pre-embedded boltless fastener system developed by Pandrol in the United Kingdom, including single Toe spring clip fasteners, "e" type clip fasteners and the fast clip fastener system developed in the 1990s have been widely used due to the advantages of fewer system parts, easy installation and maintenance, safety, stability and reliability, and low cost. It is widely used on railw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B9/48
CPCE01B9/48
Inventor 王安斌
Owner 洛阳双瑞橡塑科技有限公司
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