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CONTENT

PART 1: OVERVIEW OF DISMANTLING TOWER CRANE MC175B

1 Method Statement For Dismantling 2

2 Regulations In The Dismantle Tower Crane 2

3 Main Power For Dismantle Tower Crane 2

4 The weight of main part of Tower crane MC175 B 3

PART II: DISMANTLING OF TOWER CRANE 1 Dismantling hoist rope, trolley rope and electric cable 5

2 Dismantling counterweight 6

3 Dismantling jib 7

4 Dismantling counter jib 9

5 Dismantling cabinet 12

6 Dismantling A tower 13

7 Dismantling mast sections 14

8 Dismantling foundation 15

PART I OVERVIEW OF DISMANTLING TOWER CRANE MC175B

1 METHOD STATEMENT FOR DISMANTLING

Sequence of dismantling tower crane as bellows:

1 Dismantling hoist rope, trolley rope and electric cable

2 Dismantling counterweight

3 Dismantling jib

4 Dismantling counter jib

5 Dismantling cabinet

6 Dismantling A tower

7 Dismantling mast sections

8 Dismantling foundation

Using crawler crane 40T for dismantle tower crane

2 REGULATIONS IN THE DISMANTLE TOWER CRANE

 All personal protective equipment will be supplied and must be maintained properly and worn at all times when “on site”

 When erecting or dismantling a safety harness must be worn at all times and used when not protected from falling by handrails or the crane structure

 All procedures to be in accordance with the manufacturer s manual The stated wind speed limitations in the manual must be strictly adhered to, and in case of same restriction being exceeded, or indeed forecast to be exceeded, all work should be stopped, assuming the work is in

a safe condition

 Lines of adequate strength and length to be used to control loads

 Both before and during the operation, all the crew and also the mobile driver, must be kept informed of the procedures to be carried out, and in particular individual duties such as signals and radio controls etc for example

3 MAIN POWER FOR DISMANTLE TOWER CRANE

Manpower

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4 The weight of main part of Tower crane MC175 B

4.1 Slewing part

4.2 Fixing part

PART II

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DISMANTLING OF TOWER CRANE

1 DISMANTLING HOIST ROPE, TROLLEY ROPE AND ELECTRIC CABLE

 Tower Crane electrician will remove trolley and hoist limits to enable deroping procedure

 The trolley is then travelled to within 2 meters of jib nose

 Using a suitable rope clamp, Clamp the rope just after the final trolley sheath

 Lower the hoist rope to give sufficient “slack rope” under jib

 Trolley out until the hoist rope anchor becomes loose Unpin anchor from jib nose

 Travel the trolley to the inner most position lower hook block to the ground

 Remove the rope clamp and anchor Hoist the rope back through the trolley and coil onto hoist drum

 Note: No counter weights should be removed until this procedure has been completed

2 DISMANTLE COUNTERWEIGHT

Using crawler crane for lifting and lowering counterweight

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3 DISMANTLING THE JIB

 Tie the trolley properly with rope and retrieve the cable

 Hammer out the square-shaped pins and the steel plate which are connected to A-frame

 Afterwards, hammer out the small pins joining the wedge lock and the slewing ring

 Slightly hoist up the jib to a 5 degree angle with the ground level and hammer out the pins of the oval core within the wedge lock

 Use the crawler crane to dismantle the whole jib and lay it on the ground before continuing with the dismantling process

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4 DISMANTLING COUNTER JIB

 Hanger counter jib (1) with 2 rope (2) of 6m long

 Tying 1 rope (3) at counter jib for control when lowering from the ground

 Slightly lift up the counter jib to a 5º angle, hammer out the connecting pins on the tie bar of the counter jib Then, hammer out the small pins of the oval core within the wedge lock

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 Use the crawler crane to dismantle the whole counter jib and lay it on the ground before continuing with the dismantling process

5 DISMANTLING CABINET

 Ensure that no power cable from the cabin

 Hanger cabinet with rope (hình 1A)

 Remove pin (2) from A-frame (3) by pin (4) an bolt (5) (hình 1B, 1C), lowering cabinet to the ground

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6 DISMANTLING A TOWER

 Use slings of suitable length to lift up the A-frame + slewing ring according to the instruction manual

 Loosen the screws connecting the slewing ring and the mast with a hydraulic block

 Use a derrick crane to dismantle the A-frame + slewing ring and lay them on the ground

7 DISMANTLING MAST SECTIONS

 Use chain slings of suitable length to lift up one mast

 Loosen the screws connecting the masts with a hydraulic block

 Use a derrick crane to dismantle the masts and lay them down to the ground one by one

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8 DISMANTLING FOUNDATION