256HC Mast Section Liebherr Tower Crane

Products Specification

Type , Model: 256HC Mast Section for Liebherr Tower Crane

Size: 2.3mx2.3mx4.14m 

Use for : Liebherr Tower Crane （256HC , 290HC）

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.

256HC Mast Section Liebherr Tower Crane

Tower Crane Knowledge sharing：

The general idea, preparation, procedure and method of the demolition of the internal climbing tower crane

I. project overview and features

XXXXX building is located at the intersection of middle XX road and XX road. The main part of the project is 52 floors with a height of 154M. Above is the machine room and the apron.

The internal climbing tower crane is installed in the elevator shaft of the main building with a total height of 184M. According to the site plan, the size of the roof is as follows:

 the diameter of the apron is 23M. On the outside is a circle of platform with a width of 2.5m. On the outside of the platform is a decorative ring with a width of 2.5m.

The demolition site of the tower crane is narrow, and the demolition, disintegration and vertical transportation are all carried out in the high air, and affected by the decorative ring, it needs to be hoisted and transported over a long distance, so the demolition of the inner climbing tower crane is very difficult.

What are the characteristics and advantages of the internal climbing tower crane model?

Technical performance and main parameters of tower crane

256HC Mast Section Liebherr Tower Crane

1. The tower crane model is QTP80, which is produced by the tower crane construction machinery factory . The hoisting mechanism has a power of 30KW, with 9 speeds and a maximum working speed of 106m/min.

The maximum lifting weight of the tower crane is 8T, the lifting boom length is 45M, the balance boom length is 13.3m, the counterweight is 5 pieces, and the total weight is 10.2t.

2. Self-weight of main components of QTP80 tower crane: total weight of lifting boom; Maximum weight of single lifting boom 6552Kg 825Kg total weight of balancing arm 6130Kg including the weight of lifting mechanism2670Kg total weight of rotary mechanism

3.  4282Kg including the weight of lower support; 1486Kg tower hat weight; 1540Kg standard section weight 853Kg/section strengthening standard section weight 950Kg/total weight of balance arm 2300 kg

The general idea of the demolition of the tower crane

After several times of exploration, research and discussion on the construction site of XXX project, combined with the actual situation of the roof apron, the following steps were taken to dismantle the internal climbing tower crane:

256HC Mast Section Liebherr Tower Crane

1. Make 1 mobile internal climbing tower crane;

2. Use the tower crane's own hydraulic jacking system to lower the tower crane to the lowest point;

3. The basic parts of the tower crane are dismantled and disassembled by using the internal climbing tower crane;

4. Use the internal climbing tower crane to transport the tower crane components vertically to the ground;

5. Disassemble the internal climbing tower crane and transport it to the ground vertically.

Iv. Preparation before the demolition of internal climbing tower crane

1. Set up a professional team for the demolition of internal climbing tower cranes, which is composed of leaders, technical departments, safety departments, project departments, demolition departments, etc. The demolition department shall be responsible for the specific demolition work.

2, according to the actual situation of the construction site, the preparation of practical demolition plan, according to the demolition plan, do a good job before the demolition

 From the company, the department to the team operator, layer upon layer to do a good job of security technology disclosure. Due to the particularity of the demolition work, the operator is relatively fixed.

3. Design, manufacture, installation and debugging of internal climbing tower crane.

Design and manufacture of internal climbing tower crane

Considering that the internal climbing tower crane should also be transported to the ground after the demolition of the tower crane, the design of the internal climbing tower crane should not be too large.

In the demolition process, each structural part of the tower crane needs to be divided into parts, among which the largest single weight is the counterweight block, which weighs up to 2.3t.

Because the roof of the project has a ring of 2.5m wide decorative ring, and in the vertical transport, but also leave 2.5m wide channel, for the tower crane parts At the same time, according to the width and length of the tower crane components

Therefore, the lifting rod length of the internal climbing tower crane is designed as 9M. According to the length of the lifting pole, determine the specific size of the supporting frame, lifting and pulling frame.

The lifting mechanism adopts the main engine lifting mechanism of QTP80 tower crane, which can completely meet the requirements of vertical transportation.

256HC Mast Section Liebherr Tower Crane

The luffing of the hoisting rod is controlled by 1T roller, and the diameter of the wire rope is 11cm , which can meet the luffing requirement of the hoisting rod. Lifting pole and lifting frame are adopted?

180x8 seamless steel tube, supporting frame adopts Q235 L160X14 Angle steel butt welding, which can meet the requirements of strength, stiffness and stability of the demolition operation of the internal climbing tower crane.  the counterweight block of the internal climbing tower crane is 100Kg of iron block, which is convenient for relocation.

After checking the stability of the internal climbing tower crane, the total counterweight is 2T. In order to facilitate the removal of the internal climbing tower crane, all structural connections are bolt and pin shaft connection.

Procedures and methods for the demolition of internal climbing tower cranes

1. Site preparation before demolition;

1) remove all obstacles affecting the removal of the tower crane on site, remove sundries and garbage from the 52nd floor to the entrance of the reserved hole on the apron, and close the elevator shaft at the installation position of the tower crane Check and make relevant protective work.

2) clear the rebar reserved at the entrance of each floor during the overall descending of the tower crane to ensure unimpeded access of the reserved entrance.

3) check whether the mechanical performance of each main mechanism part of the tower crane is good and whether the braking device of the rotary mechanism is reliable.

4) check the hydraulic jacking mechanism, including oil pump, cylinder, jacking beam and safety lock;

A) check whether the hydraulic oil level meets the specified requirements and whether the oil deteriorates, and add enough or replace according to the specified requirements.

B) check whether the working condition of the hydraulic system is intact before lowering the tower crane

256HC Mast Section Liebherr Tower Crane

Operate the oil pump under the condition of no load, make the jacking cylinder move back and forth for 3 times, ensure the action of cylinder, piston and reversing valve is sensitive and reliable, the oil pressure gauge shows correctly, no oil leakage.

C) remove the bolts connecting the lower support of the slewing mechanism with the standard section, lift the tower crane overall 20-30cm, and stay for 10-15min, to observe whether there is a sliding phenomenon.

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