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Appendix
G
Excavation/Lifting/Crane
Procedures
Excavation
- Excavation Permit shall be required prior to the excavation work.
- Where excavation on the existing route is implemented, the cable
detector shall be used to detect the cables below if any, and the
necessary precaution will be taken.
- In event that an electrical cable or other buried service is exposed,
all works shall halt immediately. Under no circumstances shall work
resume until so advised by an appropriate authority of Contractor.
- Machinery shall be positioned and operated in a manner that will
not endanger any person involved in the excavation work.
- Excavation with a depth of more than 1.5m shall be shored, sheet
piles or sloped.
- All excavation area shall be barricaded with warning signboards
and provided with appropriate warning lights during nights for all
area outside the Process Area.
- Gas cylinders shall not be positioned in any excavations.
- In case of damage to the existing cable, supervisor shall immediately
inform Contractor's personnel.
Lifting Supervisor
- Must be provided / available for all lifting
operation.
- Must put on luminous vest / and band for identification during
lifting operations.
- Being the competent person, i.e. after attended courses conducted by the relevant local government, Will be responsible for the correct use of all lifting gears, appliances to ensure the stability of cranes with proper support on solid flat ground with the use of timber mattress or steel plate, out-riggers to be fully extended, and to check
angle of lift, overloading, provide rag line. The
proper hand signal should be given to the crane operator to ensure
all lifting works to be carried out safely.
Crane
- The On-Site GM Industries supervisors shall instruct the lifting
operation.
- Cranes coming to the site shall possess and display a valid certificate.
- All works involving the use of a crane shall be property planned
in advance, and a rigging study executed to ensure that:
- Hot work permit must be applied where applicable.
- The crane is capable of lifting the load, given the known
working radius, boom length, weight of the load. Etc.
- The rotation zone, assuring the boom is not restricted.
- Suitable matting or plates are available to protect underground
services and paving.
- All slings, shackles, hooks, etc., with relevant certificate
and of the correct rating are available and in good condition.
- The angle between sling legs shall not, under any circumstances
exceed 120 deg., as this doubles the tension on each leg, thereby
reducing the lifting capacity of the sling by 50%.
- Only one qualified person shall give instructions to the
crane operator.
- For mobile cranes, outriggers shall be used for each lift,
regardless of the size, and shall always be fully extended.
- A trial lift shall be performed, raising the load a short
distance above its pick-up point, to check the stability of
the crane, and the efficiency of the brakes.
- The load shall, at all times, be kept as close to the ground
as possible.
- Whenever possible, and after lifting the load from its pick-up
point, the radius of the lift should be shortened to increase
the crane's lifting capacity and stability.
- Wire slings and chains under direct tension during the lift
shall not be extended artificially, nor be kinked or twisted.
- Shackles shall be complete with the original pin, and under
no circumstances shall be a substitute bolt fitted.
- At no time whilst the crane's machinery is running, shall
the operator leave the cab and with the load suspended.
- At no time whilst a load is suspended shall personnel perform
any works standing directly beneath.
- Particular consideration to the presence of low-level structures
such as pipe bridges shall be given, where crane is to move
about the site.
- Consideration shall be given to prevailing weather conditions,
and where a greater then normal risk exists, the lift shall
be postponed until more favorable conditions develop.
- When reversing the crane, a lookout man must be provided.
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