120HC Mast Section Liebherr Tower Crane

Products Specification

Type , Model: 120HC Mast Section for Liebherr Tower Crane

Size: 1.8mx1.8mx2.5m

Use for : Liebherr Tower Crane

Materials: Q345B

Within bolts, Ladder, Platform

Process: Blasting derusting, 

Painting:  Under painting , Middle painting, Surface painting.

Our factory produce and supply almost all famous brand tower crane :Mast section, Anchor Frame, Fixing angle ,Adaptor and so on as good quality and price.

120HC Mast Section Liebherr Tower Crane

Tower Crane Knowledge sharing：

Demolition scheme of QTZ63 tower crane: preparation work, demolition process, safety technical measures

2. Install 3 portal frames to remove components of the tower crane

1) on both sides of the counterweight block of the counterweight arm, two steel tubes 6m high and 250mm in diameter are used as columns.

The lower mouth is welded to the embedded iron on the floor, and two opposite sides of channel 20 steel are used as beams, which are welded to the iron plate at the top of the column.

The portal frame is made to remove the counterweight and the counterweight arm. 16. On all sides of the gate frame, use the phi 12 steel wire rope as the cable wind rope and tighten with the pattern blue bolt; The beam of the portal frame can only be installed when the balance arm of the tower crane falls below 5m from the roof. - 3 -

2) in QTZ63 tower crane standard section on both sides with a height of 7.5 m (five construction lifter standard section) as the pillar, column under the mouth with through-wall bolts to connect to the floor, with 20 steel channel across the two root welding as a beam.

 The beam center to a pulley, and the pillar top plate welding, make the door frame, used to remove the tower cap, cab, turning up and down, the standard section and climb, climb inside frame girder, etc.; 16. The type frame USES the phi 12 steel wire rope to make the cable wind rope four sides, and USES the flower blue bolt to tighten.

120HC Mast Section Liebherr Tower Crane

3) in the jib 26 m on both sides with two 3 m high and 250 cm diameter steel pipe for pillar, column under the mouth and floor embedded iron welding, from 1.2 m floor with a piece of 20  channel steel and column welded into a beam, the tower crane jib front-end shelved after falling on the door frame beams.

So that the lift arm loose tie rod is not force, convenient remove the tie rod.

3. Disassembly process

Position of tower crane arm can rotate to remove - climbing tower crane block bottom from the roof is the drop in the overall balance of 0.6 m to remove the hook, rope, cars and counter weight to fall another type tower crane to hoist boom forearm aside on the door frame of three beam descending again the balance of its arms to the roof to stop

 Removing the gibbet rod to remove the jib, remove the balance arm bars - remove the balance arm - remove the cab, hoist and distribution box to remove the tower cap, remove the rotary tower to remove the upper and lower bearings, remove the basis and the standard of the tower section section - > remove crawl within the steel beam and frame.

120HC Mast Section Liebherr Tower Crane

4. Horizontal movement of parts on the floor

After the parts of the tower crane are lifted to the floor, steel pipes are placed below the parts, which are pulled by the 3t hoist or manually pushed to complete the horizontal movement, so that the parts of the tower crane are moved to the designated place one by one.

Installation of the mast crane

1) after the completion of the fabrication of the mast crane, the welding parts of each part shall be inspected for flaw detection.

Order: 2) mast crane installation base - > install base four balance arm and roofing of concrete girder bolted to install rotary bearing, installation of tower mast crane to install mast crane four inclined strut,

The use of tower crane installation mast crane boom - using the tower crane boom of the installation of two tension rod .

3) install the hoist removed from the tower crane and wear the steel wire rope to draw the rod.

4) install the power distribution box and cab removed from the tower crane and switch on the power.

120HC Mast Section Liebherr Tower Crane

5) test run.

(4) lowering process of tower crane parts from the top surface

1) lower lifting process: lower weight block lower lifting boom lower balancing arm lower tower cap lower tower slalom body lower tower upper and lower support standard section of lower tower body lower foundation section, steel beam and internal climbing frame, etc.

2) carefully check whether each part of the mast crane is in normal operation before lowering the parts. If any defect is found, it shall be dealt with in time.

3) try to mourn: before the hanging from the floor and tower crane parts to the mast crane hoisting test, under the mast crane hoisting test process: start the winch to lift a weight of 6 t object, the object hanging from the ground about 10 cm, is it suspended around 15 min, carefully observe the mast crane every part is normal, check the rear can be carried out under normal work. - 5 -

4) hang counter weight: use hoist level mobile counter weight system be moved to the specified location, with the mast crane hook will be the counter weight hanging from the floor 2 m high.

Human push the mast crane turning its boom in the down position, with the steel wire rope fixed on both sides of derrick, in case the process or swing boom to turn right or left, the last under the counter weight.

5) lower hoisting boom and balancing arm: decompose the lifting boom and balancing arm and use 3t hoist system to move them horizontally to the mast hoisting position and then lower them to the ground.

To prevent the lifting boom or balancing arm from hitting the glass curtain wall, the lifting point is set at two thirds of each decomposed lifting boom or balancing arm.

6) lower tower lifting cap: as the height of the tower cap is relatively high, the lifting point is two-thirds of the height of the tower cap.

7) lower hanging rotary tower body, upper and lower support, standard section of tower body, steel beam and internal climbing frame, etc.

8) remove the hoist, distribution box and cab: after all parts of the tower crane are lifted to the ground, remove the hoist, distribution box and cab and transport them from the construction hoist to the ground.

Because the hoist is heavy, it needs to be disassembled into three parts before it can be transported from the construction hoist.

9) disassemble the mast crane: the order of disassembly is to disassemble the hook, wire rope disassemble the hanger rod of the mast crane disassemble the four inclined poles of the mast crane tower disassemble the tower body disassemble the slewing support disassemble the base disassemble the four balance arms of the base.

After all parts and components of the mast crane are disassembled, they will be transported from the construction elevator to the ground construction elevator. Each part of the mast crane shall not exceed 3m in length and 2t in weight.

10) the tower crane parts of the lower crane shall be matched with the 25t truck crane on the ground, and shall be loaded and transported in time for the next part to be lowered.

Precautions and safety technical measures for tower crane removal

Liebherr Tower Crane

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