Page 356 - IRSEM_Main Book

14.2.3 Installation of Mechanical Lifting Barriers (MLB)

(a) A separate fracture segment shall connect the boom with the mechanism
near the pivot. Fracture segment mounting shall be of such a design that it
can be transported, replaced easily and quickly and in case of a mighty hit
shall allow for the break of the segment without endangering the mechanism
itself.

(b) Winch for the operation of the lifting barrier shall be located at a place
(including cabin) not exceeding 150 meters from the gate and having clear
visibility of the road.

(c) It shall be ensured that while closing the gate, warning bell rings and lamp
bracket also gets turned to give required indication to road users.
Alternatively standard audio and visual signals for road users as required
for electric lifting barriers shall be provided.

(d) It shall be ensured that the roller fitted to the rope drum enters the trunnion
bracket and activates the boom for closure/opening.

(e) It shall be ensured that Boom locking is effective and it is not possible to lift
the boom by more than 10° from closed position.

(f) The wire rope shall not overlap at the winch and rope drums.

(g) The guy rod shall be given sufficient tension for smooth operation of the
boom.

(h) Oil holes, grease nipples, etc. shall be provided with spring loaded covers.

(i) It shall be possible to extract the key from the winch only when the gate is
fully closed.

(j) At mechanical interlocked gates, interlocking shall be achieved through 'E'
type locks or by approved means.

14.2.4 Installation of Electric Lifting Barrier (ELB)

(a) Where reliable power supply is available at any interlocked Level Crossing
Gates (of special class, A, B1, B2 class & C class) in any section,
electrically operated lifting barrier of approved design shall be provided.

(b) The boom shall be of approved type. The metallic type boom shall be
segmented for easy transport, installation and replacement.

(c) Operation of the lifting barrier may be provided from a gate control panel or
by any other approved equipment.

(d) At the centre of the boom, a red reflector shall be provided.

(e) Emergency operation by hand crank shall be provided.

(f) The boom must be so balanced that in case of failure of power supply, the
barrier shall remain in the position last assumed.

Chapter 14: LC Gates Page 307 of 535