Rahee Rail Expansion Joint design
is based on proven design of thick-
web switches which allows reciprocal
movement of both tongue rail and stock
rail up to 100 mm at each end along the
length.
Switch type expansion joint design is
proposed to eliminate the gap which
causes severe impact during the
movement of rolling stock. The basic
concept of this design is to provide a
curved guided path to uncut stock rail
by precise machining of tongue rail.
RAIL EXPANSION
JOINTS
Salient features of design:
~ Gapless & Boltless
~ No use of brackets
~ No machining of Stock
Rail
~ Use of thick web tongue
end forged rail
~ Use of standard
fastenings
In this design both thick web tongue
rails and stock rails are elastic fastened
through the entire length using
Canted chair.
Use of inner fastening for holding
stock rail on both sides minimizes the
possibility of dynamic gauge widening.
The tip of tongue rail is housed in the
recess under the head of stock rail
which is formed by machining of the
stock rail head. This reduces impact at
entry and wear at switch tip.
Glued insulated joints are used in tracks that meet certain requirements
regarding stability, good tamping and sleeper quality. It consists of glass
fibre cloth insulated fishplates, a corresponding number of insulated
high-tensile bolts and end post made of insulating material.
They can be assembled in-situ or at works. It meets International
standards for insulation resistance, pull load, deflection test, wet
insulation test etc. Every fabricated/ assembled joint is checked for
vertical and lateral alignment. Joints are subjected to insulation
resistance test in dry condition. Pull out test is also carried out at works
as a prototype test. The prototype test also includes insulation test in dry
condition and test in wet condition.
GLUED INSULATED
JOINTS
Advantages
~ Reduced wear in wheel
overrunning area
~ Reduced maintenance
costs
~ Reduced noise
~ Greater riding comfort
Types of sleepers
: Wood and concrete
Rail sections
: All common rail sections
Heat treatment of joints
: Hardened or preferably made from
head hardened rails
Bonding
: With appropriate bonding and
hardening agents
Manufacturing locations
: In the factory
Technical characteristics:
Ideal conditions regarding cleanliness,
temperature and manufacturing procedure
because rail ends and surface of steel parts to
be bonded must be spotlessly clean.
At site
As per client’s instructions.
~ Ease of installation
~ Lower noise and
maintenance
~ Excellent design for
Heavy Haul and other
applications
~ Low product life cycle
cost