Jack Up Tower Crane

Jacking tower cranes are widely used in construction projects, mainly for vertical transportation and horizontal transportation. It has a number of advantages: large lifting height; The amplitude coverage is wide and the utilization rate is high; High working efficiency (relative bridge crane, gantry crane); It is especially suitable for the construction of high-rise buildings.

The jacking tower crane is generally composed of three parts: the working mechanism, the metal structure and the electrical control system.

1. Working mechanism (hoisting, slewing, luffing, walking "four mechanisms", as well as hydraulic jacking, cable reel, etc.).

A The hoisting mechanism is a working device that realizes the vertical movement of heavy objects, and the hoisting mechanism is mainly composed of a winch, a wire rope, a pulley block, a hook, etc.

B trolley luffing mechanism is a working device that changes the working amplitude of the tower crane, realizes the horizontal movement of the lifting weight, makes the tower crane expand the vertical movement of the heavy object to a plane along the crane arm, and expands the operating range. The boom tower crane is to realize the horizontal movement of the lifting object by changing the elevation angle of the boom.

C slewing mechanism is to realize the tower crane boom around the tower crane center line rotation of the working device, so that the heavy object can be in the tower crane center line for horizontal circular movement, so as to expand the tower crane operating range to a space. There are internal and external teeth.

D walking mechanism is to make the tower crane move along a certain direction of the working device, for the construction of the tower crane, generally is the track type, the tower crane along the laid track back and forth walking, especially suitable for the length of the larger construction.

2. Metal structures (booms, balance arms, tower caps, slewing supports, tower bodies (standard sections), chassis, sleeves)

The jacking tower crane is a kind of large-scale lifting equipment, and its metal structure accounts for about 70% of the total weight, and the metal structure of the attached tower crane accounts for a larger proportion. Most of the metal structures of modern tower cranes are welded to bear a variety of loads such as tension, compression, bending, torsion, etc., the welding quality of the second-hand tower cranes sold by our company is very good, and the safety performance of the whole machine is very high. The fatigue life of the steel structure of the tower crane is an important basis for the life of the tower crane. Due to the role of the steel structure by a variety of loads, coupled with the structure of the material, welding, process defects and stress concentration phenomenon is easy to produce cracks, resulting in potential safety hazards, therefore, our company's second-hand tower cranes are strictly controlled quality, will not choose a long service time of the tower crane, and often check the tower crane steel structure, timely repair.

3. Electrical Control:

The jacking tower crane is generally driven by electricity, powered by external power supply, and each working mechanism is driven by a motor respectively, generally using 380V/50Hz. The control system of the tower crane comprises a control device and a safety device, and some tower cranes are also equipped with a monitoring display system, and the control device is composed of electrical control equipment and a control mechanism to control the movement of each working mechanism of the tower crane and complete the various actions required by the tower crane operation. The tower crane driver's room is equipped with a linkage console, and the console has 2 handles, generally the left hand controls the rotation and luffing, and the right hand controls the lifting and walking. Tower crane is a kind of lifting equipment with a large working height and working amplitude, on the construction site, there are inevitably various personnel activities under the working surface, so safety is extremely important, and must be equipped with various safety devices.

Jacking tower cranes are widely used in the construction industry, and their advantages are mainly reflected in the following aspects:

1. Adaptable

Height adjustable: The height of the tower can be gradually increased through the jacking system to meet the construction needs of high-rise or super high-rise buildings.

Flexible configuration: The length and counterweight of the boom can be adjusted according to different construction stages to meet the diverse hoisting needs.

2. Save space

Free-standing installation: no need to rely on building support, suitable for narrow or dense construction environments.

Reduced disturbance: The tower crane foundation occupies a small area, which has a low impact on other operations on the construction site.

3. Superior lifting performance

Large coverage: Horizontal boom (flat boom) or boom design can cover a wide working area and reduce blind spots.

High load capacity: Heavy-duty components (e.g. steel beams, precast concrete, etc.) can be lifted by jacking for increased stability.

4. Cost-effective

Controllable cost: No need for frequent disassembly and assembly, it can adapt to the change of building height through jacking, reducing leasing or relocation costs.

Shortened construction period: continuous jacking improves efficiency, especially suitable for high-rise projects with rapid construction.

5. High security

Strong stability: The jacking system strengthens the tower body section by section through hydraulic devices, and the wind resistance and overall stability are better than those of ordinary tower cranes.

Good controllability: Modern jacking tower cranes are equipped with safety devices such as limiters and torque protection to reduce operational risks.

6. Advanced technology

Modular design: The standard section structure is easy to transport and assemble, and the jacking process has a high degree of automation.

Intelligent application: Some models integrate functions such as remote monitoring and real-time load feedback to improve management accuracy.

7. Environmental protection and energy saving

Electric drive: Most jacking tower cranes are driven by motors to reduce noise and pollution

Resource optimization: Reuse standard sections to reduce material waste.

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