SHANGHAI WEDO INDUSTRY CO.,LTD.

Rail Plastic Sleeves Overview

2017-09-15 10:39:51

What is rail plastic sleeves?

Rail plastic sleeves is also called rail plastic dowel, plastic insert, concrete dowel/ concrete insert, which is a counter-party fastener for a sleeper screw or anchor bolt, and it is pre-imbedded into the concrete or wooden sleeper tie, installed together with screw spikes, guide plates and rail clips to fasten the rail tracks. 

 rail plastic sleeve

Functions of rail plastic sleeves

In a set of rail fastening system, the plastic dowel can be considered as the fastening foundation, as it needs to be pre-inserted into the concrete sleeper separately before assembling the rail fastening system parts. It is used to guarantee the good connection and linkage of the rail fastening system with the concrete sleeper, with screw spikes or bolts.

Rail Plastic Sleeves Function

On the other hand, similarly as the rail pad or rail insulators, the plastic insert’s another function is to insulate the fastener parts from the ties. Therefore, the quality of this small pre-inserted part into the concrete sleeper, especially its strength and fatigue life, is of great importance to the whole rail line. Taking WJ-8 fastening system for an example, the collaboration of anchor bolts and imbedded plastic sleeves in the track slabs makes the tie plate be tightly fastened to rail and sleeper, through rail clips, to fulfill a enough elasticity range, to avoid the rail bolt against becoming loose, and decrease the maintenance work accordingly.


Types of rail plastic sleeves

Rail plastic sleeves are always used in SKL fastening systems, and can be classified according to its materials needed: of PA66 or HDPE, depending on different technical specification requirements from clients, as below:


Check Item

STANDARD

II

III

207

111

DTIII

WJ-2

X2

DJK-1

SK114A

SKL14-D13-B

Length(mm)

120±1

135±2/2

110±1

119±0/2

130±1

135±2/1

130±0.5

130±0.5

165±1

165±1

Inner Pole Length(mm)

/

40±1

/

/

/

/

/

/

/

 

Outer Dia(mm)

49±0.5

45±0.5/0

53±0.5

35±1/0

47±0.5/0.3

24.5±0.3/0

44±0.5/0.3

39.5±0.7/0.3

39±0.6/0.2

39.5±0.6/0.2

Inner Dia(mm)

31±0.5

31±0.5/0.3

31±0.5/0.1

25±0.5

31±0.5/0.3

31±0.5/0.3

28±0.5/0.3

25±0.15

25±0.5/0

24.5±0.3/0

Position Hole

Inner Dia(mm)

/

5±0.2/0

/

/

/

/

/

/

/

/

Bottom Width(mm)

/

41±0.5

/

/

/

/

/

/

/

/

Verticality

Previous:Railway Rail Fastening System

Next:Rail Plastic Sleeves