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Rail fastener
Jan 31, 2018

The rail fastener is the part that is used to join the rail and sleeper (or other types of rail) in orbit, and is also known as the interconnecting part.

Its function is to keep track of the rails and keep track and prevent the rails from moving horizontally.

It includes spike, track pad, and elastic or rigid fastener.

The fastener should be able to maintain the reliable connection between the rail and the sleeper for a long time, and can give full play to its cushioning and damping performance under dynamic action, and delay the accumulation of residual deformation.

Therefore, it is required to have sufficient strength, durability and certain elasticity. It should also be simple and easy to install and disassemble.

In addition, for prestressed concrete sleeper, the buckle should also have enough buckle pressure and gauge, horizontal adjustment.

[wooden pillow b] fastener.

A jointed part for connecting rails and wooden pillows.

According to the connection of steel rail, cushion plate and wooden pillow, the relationship among them is divided into two parts: rising and mixing.

The split type fastener is to separate the fixed steel rail from the bolt or spike of the fixed iron plate.

The iron washer is usually fixed on the sleeper by a spike, the rail groove is on the iron plate, the bolts of the fixed rail are installed on the iron plate, and the rail is fixed with a bullet or gusset plate.

The hybrid fastener is made of iron pad and spike.

Connect the rail with the iron plate and the sleeper directly with the hook spike (square).

The buckle pressure is small, in order to prevent the rail longitudinal creep, need more anti - climbing equipment.

Concrete pillow fastener.

The concrete sleeper rails are used to connect the rail and concrete sleeper parts.

The concrete pillow, due to its large weight and large rigidity, has a high requirement on the performance of the fastener, and it has strict requirements on the buckle pressure, elasticity, and tunability.

Concrete pillow fastener, according to its structure can be divided into bullet strip fastener, gusset plate type fastener, shrapnel type fastener (see concrete pillow fastener) 3 kinds;

The elastic can be divided into rigid fastener and elastic fastener according to the fastener itself;

According to the concrete sleeper, there are two kinds of shoulder and shoulder fastener.

Chinese concrete pillow fastener, in the early stage mainly use the gusset plate type and the shrapnel type two kinds.

Because of the low strength of arched shrapnel, the arched shrapnel fastener is easy to cause residual deformation and even fracture, so it is no longer used on Chinese railway.

And the buckle type fastener is made by using the buckle plate as the buckle, the elasticity is insufficient, the buckle pressure is low, easy to loosen in the use process, now on the Chinese railway has been gradually replaced by the bullet type fastener.

Elastic strip type fastener article using play as burke, using bending deformation and torsional deformation of material, and there exists no problem of cross section of the weakened, structure more reasonable, thus concrete sleeper rail has become the main type of fastener.

Article is using the main type of fastener for play Ⅰ type fasteners, with the development of overloading high-speed rail, in recent years has been successfully developed article play Ⅱ Ⅲ type fastener, etc.

Among them, the Ⅲ type fastener for without bolt block shoulder fasteners.

Gusset plate type fastener consists of gusset plate, screw spike, spring washer, iron and buffer plate, screw spike with sulfur cement mortar anchor in concrete sleeper support rail station in the hole, then use will gusset plate fastening bolt.

Article article elastic fasteners play Ⅰ, Ⅱ, Ⅲ type.

Play Ⅰ type by omega play, screw spike, gauge apron and rubber mat.

Its buckle pressure is not enough, the springtime is small.

Play Ⅱ type of appearance is same as the article play Ⅰ type, cheng is not less than 10 mm.

Button type pressure article is playing Ⅰ increased.

Article play Ⅲ type is no shoulder fasteners, suitable for big traffic volume, high density transportation conditions, it has a button pressure is large, the advantages of good elasticity, especially cancelled concrete block shoulder, eliminates the rail bottom under transverse force is the possibility of horizontal displacement.