scaff and mewp and height

7/28/2019 Scaff and Mewp and Height

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PARTLY ERECTED OR DISMANTLED SCAFFOLDS

No scaffold or part of a scaffold shall be partly erected ordismantled and remain in such a condition that it is capable of

being used unless the scaffold complies with the following:

a prominent warning notice indicating that the scaffold, or any

part thereof is not to be used, positioned at or near any point ofaccess;

or,

access to the scaffold or any part thereof is, as far as is

reasonably practicable, effectively blocked off.


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LEDGERS AND TRANSOMS ledgers must be level and fixed to standards

with right - angle couplers.

In normal use, transoms should be spaced so

that the spans of scaffold boards should

not be greater than:

* 32mm thickness boards: 1.0m

* 38mm boards: 1.5m

* 50mm boards: 2.6m


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-

LEDGERS:

Centers not to exceed 2.0 m,

but base lift may be a maximum of 2.7 m

TRANSOMS:

Maximum spacing 1.5 m.


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LADDER set at a working angle of 75 degree to the

horizontal, i.e. one foot out for every four

foot of height, and extend at least 1.05m (5rungs) above platform level to provide

adequate rungs on a stepping-off points

should be on a level with the workingplatform. and hold at all stepping-off

points


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GUARD RAIL Minimum height of 910mm on all structures over 2.00m high and

secured on inside of standards.

A second lower guard rail or higher toe board should be provided to limit gap to

470mm.

TOE BOARDS - Min. height 150mm fixed on all structures.

BOARDING - To be close boarded and end butted throughout.

TRANSOMS Mximum spacing 1.5m.

STANDARDS. Centers dependent upon duty use.

LEDGERS Centers not to exceed 2m, but base lift may be up to 2.7m max.

TIES Hook, Lip, physical reveal etc. to be considered individually, and B.S.requirements observed.

LEDGER JOINTS Not more than 1/3 into a bay and be staggered throughout i.e.

adjacent bays or lifts.

STANDARD JOINTS Must not occur at same height.

STANDARD/LEDGERS Fixed with right angle couplers.

BRACING Ledger, zig-zag, Dog Leg, always secured on load bearing couplers atalternate pairs of

standards. Face, Faade, Longitudinal, Wind, 45o Angle over full structure height at

30m centers

secured with load bearing couplers and joined end with sleeves.

BASEPLATES Generally below standards, and 150mm x 150mm size. SOLE

PLATES Use in prescribed circumstances and no smaller than 1,000cm2 beneathone standard.


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WALKWAYS Width of working platforms more than 2m high,

must be:-

600mm wide (3 boards) when used for personsonly and not for materials.

800mm wide (4 boards) when used for personsand for the deposit of materials, though

there must be a 430mm passage left for personsclear of materials. This passage must beincreased to 600mm if barrows are to be used.

1.05m wide (5 boards) if used to carry a trestle orany other higher platform, and 1.30m wide (6boards) if used by masons.


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STANDARDSStandards on base plates should be set

vertically in rows at not more than 2.50mcentre to centre in each direction.

ledgers

The first lift should not be more than 2.50mhigh; subsequent lifts should be at 2mintervals

transoms

At working platform level, transoms spaced atnot more than 1.50m intervals (assuming38mm thick boards are used) should be fixedto ledgers with right angle or putlog couplers


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SCAFFOLD TOWERS

Foundation erected and used on firm ground.

static towers should have metal base plates.

mobile towers must be used only on hard, level surfaces and fitted

with wheels or castors which should not be less than 125 mm in

diameter.

castors or wheels should be locked into the base of standards and

be fitted with brakes which cannot accidentally be released

working platforms

fully boarded and at least 600mm wide, or at least 800mm

wide when used for the deposit of materials.

protected from tipping or sliding by being properly supported

by the use of cleats or other proprietary fittings.

any trap door or hatch on the platform should be closed


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Guard rails and toe boards fitted on all four sides of the platform.

Toe boards must rise at least 150mm above platform level

guardrails must be between 910mm and 1.15m above platform with thedistance between top of the toe board and guardrail not exceeding 765mm

Access

Access should be provided either by:- vertical ladders attached internally to the narrow side.

internal inclined ladders, or inclined stairway,

ladder sections, integral with frame members

should be climbed from the inside as illustrated

rungs should be no more than 300mm apart and the stiles not more than480mm apart

climbing using the horizontal of end frames should not be permitted

the maximum recommended freestanding height for mobile towers

is 9.6m, and for static towers, 12m.


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SUSPENDED SCAFFOLD (NOT POWER OPERATED)

all ropes, winches, blocks and tackle must be strong enough andcorrectly rigged.

safe anchorage for the suspension must be provided

have brakes which apply when the operating lever is released.

be protected from the weather, falling dirt etc.

maintained in good condition and platforms prevented fromswaying whilst in use.

steel wire rope must be used for the suspension of all platforms

other than lightweight cradles.

lightweight cradles may be suspended by fiber ropes and pulleyblocks which should not be more than 3.20m apart. (only ropes

recommended by manufacturers should be used).


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Outriggers be long enough and strong enough.

be horizontal (light cradles are excepted).

have stops at their outer ends (light cradles excepted).

be tied down or properly counterweighted at the tail.

be close enough together to support the rails and scaffolds properly.

Counterweights

be bolted or securely attached to the outriggers.

be at least three times the overturning movement of load

Platforms

hung clear of the building or face of the structure.

be close boarded.

be at least 430mm wide on lightweight cradles. be at least 600mm wide on all other types if used only for workmen, or be at least

800mm wide if used for workmen and materials.

never be used to carry another higher platform.


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Runways strong enough and in good condition

have stops at each end

be bolted or tied securely to their supports

Suspension ropes or chains

must be properly secured, both overhead and to the frame of the platform

Winches

must have at least two full turns of rope on the drum when platform is in its lowestposition

be marked with the length of rope on the drum


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SUSPENDED ACCESS EQUIPMENT

a cradle or working platform

suspension ropes and hoisting equipment a temporary or permanent roof rig to which the suspension ropes and cradle

are attached.

Suspended access equipment normally falls into two classes:

those relying on counterweights for stability (usually temporary installed)

those which are structurally attached to the roof or top part of the building

(usually permanently installed).


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installation and riggingBefore installing or rigging suspended access equipment you should ensure that:

installation is carried out by an experienced cradle erector.

all equipment is thoroughly examined by a competent person after installation and /or

rigging and before being put into service.

Particular attention is paid to the safety of those installing or rigging the equipment to

ensure that they are provided with appropriate means of fall prevention or fall arrest.

roof rig should be designed by a competent engineer who should ensure that that the

supporting structure is able to withstand the imposed loading.

when traversing tracks are used they should be set as nearly horizontal as possible.

spacing of outriggers should be determined with reference to manufacturers

specification and the loads to be carried. where counterweights are used as the means of holding down the inboard end of an

outrigger they should be marked with their weight and firmly attached to the outrigger.

(Bags of sand, cement etc. are not appropriate counterweights).

all outriggers must be strong enough to carry the weight of the suspended platform and

its load, with the appropriate safety factor.


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working platformsguard rails and toe boards

Whatever type of working platform is used, toe boards, at least 150mm high, and a main

guard rail at least 910mm above platform level must be fitted. A further guard rail, or

other suitable barrier must also be fitted so that the gap between any guard rail or barrier

and toe board does not exceed 470mm.

deckingDecking of the platform, which must be at least 600mm wide, should have a sound, slip

resistant surface and should be fixed so that it cannot be accidentally displaced. Except

to the extend necessary for drainage, the decking should be close boarded, or plated

prevention of falls

In order to prevent the access equipment from falling in the event of a rope failure, thesuspension system should include a secondary rope and fall arrest device.

Where it is not practical to fit a safety rope, each operative should be provided with a

suitable safety harness


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Electrically operated equipment

Equipment should be installed in accordance with the IEE Regulations for Electricalinstallations and operated to ensure compliance with the Abu Dhabi Water and Electricity

Departments (ADWEA) Regulations.

The power point should be accessible at all times, and, when work is in progress, there

should be a notice clearly displayed to warn that power must not be switched off.

Power cables should be:

looped and secured at roof level to prevent any risk of them being pulled out of their

sockets.

cables and connections should not be allowed to lie in gutters where water can collect.

pendant cables must be robust and of adequate length to allow for planned movementof the platform.


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Operation

Suspended access equipment must be operated strictly in accordance withmanufacturers recommendations. It is recommended that the equipment is

checked daily.

Main requirements:

only trained people should be allowed to work on suspended access

equipment.

supervisors should be experienced and competent in the whole operation.

working platforms should be raised and lowered with care so that they remain

as near horizontal as possible.

mobile roof rigs should not be moved whilst operatives are on the platform.

when work is being carried out from the platform , or it is left in place between

periods of work, it should be tied to each end of the building to prevent undue

movement.


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a suitable emergency procedure should be established and understood by all those

involved in the work.

when left in position unattended, care should be taken to ensure that unauthorized

persons cannot easily reach trailing ends of suspension or safety ropes. Similarly, all

electrical gear should be out of reach and effectively isolated

suspended access equipment should only be used for the purpose for which it was

intended. It should never be used for transferring persons from place to place.

platform and equipment should be regularly washed down (taking care to prevent

wetting any electrical equipment).

Precautions for the protection of the public, such as the provision of ground levelbarriers, must always be considered in the use of suspended access equ


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MOBILE ELEVATING WORK PLATFORMS (MEWP'S)

Mobile elevating work platforms (MEWPs) are classified as lifting equipment for liftingpersons. They are designed to provide a temporary working platform which can be

easily moved from one location to another.

scissor lifts, telescopic boom , articulating boom combined telescopic &articulatingboom


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Precautions (all types)

Conduct risk assessment

1. If outriggers are fitted, check they can be fully extended in the working area.

2. Check machine is level or can be leveled.

3. Check the ground is firm and will support loadings. Use adequate packing if

necessary under outriggers. Avoid basements, cellars, sewers, drains,

manholes, old trenches, joints in concrete, and cracks.

4. Only trained persons should be allowed to operate a MEWP. Operatorsshould have received training for the relevant class of machine and, in addition,

should receive familiarization training for the particular make and model to be

operated. Such familiarization training is typically provided by plant hire

companies when a MEWP is delivered to site. It does not constitute adequate

training in itself.5. Safety harnesses should be worn at all times by personnel working from the

platform.

Harnesses must be attached to purpose-designed anchorage points (if

provided) or other suitable anchorage points as indicated in the manufacturers'

instructions. Note that the top guard-rail of the working platform may not besuitable as an anchorage point.


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6. The safe working load must be clearly marked at the base of the machine

and on the working platform. The load specified must not be exceeded. Care

needs to be taken to reduce the build up of debris and material on the platform.Telescopic and articulating machines are normally designed to carry operators

and tools only. Scissor lifts may have the capability to carry some materials.

Manufacturers' instructions must be followed.

7. Persons should not leave the working platform whilst in an elevated position,nor should materials be transferred.

8. Step ladders or hop-ups must never be used on the working platform to gain

extra reach or height.

9. MEWPs must only be used within the manufacturers recommended wind

speeds. This may necessitate a wind speed indicator being available.


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10. If MEWPs are self-propelled, the operator must walk the intended route to

identify any hazards before commencing the operation. Travelling on inclines

must only be carried out within the limits specified by the manufacturer. MostMEWPs have very low gradient tolerance and are fitted with tilt alarms to warn

when the limits are exceeded.

11. MEWPs are fitted with emergency (auxiliary) lowering controls and an

emergency stop switch. Before using a MEWP the operator(s) and anotherresponsible person on site (who is not working on the platform) must know how

to use the emergency controls.

12. On completion of the work, the MEWP should be parked in a designated

area. It should never be left in a raised position. The MEWP should have theengine/ motor switched off and the key removed


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MEWP operator's daily safety checklist

From ground level

1. Check that manufacturer's handbook is with the machine.

2. Check fuel, water and oil levels and that batteries are fully charged. Ensure

batteries are secure, clean, free from corrosion and electrolyte level is adequate

3. Check the machine starts and that the emergency stop button (engine cut-out)

works.

4. Check that tyres are free from significant damage and are inflated to the correctpressure. Check that wheel nuts are in place and properly tightened.

5. Check structural parts for visible cracks or damage.

6. Check that the hydraulic system is free from leaks and that cables are in good

condition.

7. Check that pins and retainers are in position and in good condition.

8. Check that signs identifying the controls, SWL, crush points, etc are in place andreadable.

9. Check that all powered movements for telescoping, raising, lowering and slewing

are in good working order.

10. Check that emergency lowering controls are fully functional. Always refer to

manufacturer's handbook.


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From the working platform

1. Check that the platform structure is in good condition, clean and free from grease and

dirt, and that cage door locks are fully functional.

2. Check that decals identifying the controls, SWL, harness anchor points, maximum

wind speeds, etc are in place and readable.

3. Check that all powered movements for telescoping, raising, lowering and slewing are

in good working order.

4. Check that emergency lowering controls are fully functional.5. Test lights and horn, when fitted.

6. Check that the steering controls function correctly in forward and reverse.

7. Test brakes to ensure that they are working efficiently in forward and reverse.

8. For machines designed to travel while the platform is raised, check that the "drive

speed is restricted when the platform is in the raised position.

NB When carrying out these checks operators must not work under a raised boom or

platform unless movement has been prevented by means of suitable locking devices.

scaff and mewp and height

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