DAHA Tower Crane QTZ120

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Dahan group, established in 2000, is specialized in Tower Crane Hoist and Building Hoist. And registered capital reaches 100 million RMB. Dahan group has their own research and development department as well as production, marketing, service and financial department. The production capacity can be over 10000 sets and have earned the reputation as a leading manufacturer of tower crane and construction hoist.

Located in Jinan high and new technology industrial zone, office area is 3000square meters. Production base is in Jinan, Guangdong, Hunan. Total area  reaches 300000 square meters.

High-quality technological management team and first-rate production and detection equipment lay good foundation for the steady development of the company. Its technology and management personnel, including many senior engineers, have college degree or above, and skilled workers mostly have vocational school degree or above. The company also has over 200 general and special production equipment and over 300 measuring instruments for detection. The company passed the certification of ISO9001 Quality Management System in 2002, providing reliable guarantee for the management system and product quality.  

Our Dahan concern requirements of modern city construction and strive to provide products with advanced technology and rational price, furnish good technical support and pre and after-sales service for customers. We hope to create beautiful future with customers.

Corporate Vision

Vision:Become an ever-green construction machinery enterprise and maximally meet customers’ requirements
Core Values  
Quality: High quality, innovation, safety and reliability.
              High quality is the basis of the enterprise.
              Innovation is the soul of the enterprise.
              Safety is reverence to life.
              Reliability wins the trust.
Service: Customer focused, customers are existence value of Dahan people, do what we have promised.
Responsibility: Attentive and responsible, brave to undertake and fully perform individual, company and social responsibility.
Spirit
Hard Work:Industry, simplicity, perseverance and hardships are the source power of Dahan to achieve transnormal and leapfrog development.
Struggle:Concentrated reflection of brave advance, assiduous seeking, brave challenge and enthusiasm and progress of Dahan people.
Pioneering & Progress::Promote traditions, keep pace with the times, have the courage to innovate and pursue excellence in work

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Q:How did the tower crane rise on the construction site? Fifteen
It's not a cable, it's a steel bar! Scaffolding
Q:What are the "2 magnification" and "4 magnification" mentioned in the lifting characteristics table of tower cranes?
Popular saying: "car to hook this section of vertical distance, you see 4 wire rope is 4 magnification, you see 2 wire rope is 2 magnification.".
Q:How to choose tower crane in engineering, such as arm length and lifting weight?
First of all, your engineering structure is reinforced concrete Or steel? What's the weight of the lift? The lifting capacity of tower cranes should meet the needs. Generally speaking, steel structure hoisting, tower crane of the largest lifting weight and gravity moment should be large; hanging steel reinforcement of a smaller can.Secondly, the boom length should be covering the scope of construction (can also be arranged to meet several sets of crane lifting coverage). But in the 360 level luffing jib range, can not have obstacles (other cranes and buildings), and the boom and the distance between them (below) should be not less than 2m.Third, in the construction project is relatively high, the site is relatively small, you can mount the internal climbing tower crane. Building covers a large area, sometimes one can solve the problem. Of course, it is more troublesome to disassemble and lift inside, but the standard section used is less and the cost can be lower.
Q:What are the lifting moment requirements for tower cranes?
3, tower crane, such as lifting weight limiter, amplitude limiter, height limiter and load torque limiter limiting device, and travel limit switchestower lights wind instrument, wind clip rail device ladders athletic supporter circlewalkways and railings. The driver's cab is comfortable, easy to operate, with good vision and perfect communication facilities.
Q:What is an attached tower crane?
Its weight is 5 ~ 100kN, lifting radius of 3 ~ 35m (trolley), the lifting height is 160m, the maximum lifting torque of 1600kN - m, each with high 2.5m, the QT4 - 10 type crane lifting system comprises a lifting sleeve frame, long stroke hydraulic jack, bearing seat, lifting beam and a positioning pin. The cylinder block of the hydraulic jack is installed on the support seat at the bottom of the tower, and the lifting process can be divided into five steps.
Q:Safety rules for tower cranes
Three. Check after shutdown3.1 after the tower crane has stopped operation, it is necessary to select the suitable position of the barrier and the middle of the track when the turret is turned and the arm to stop along the wind, and then lock all the rail clamps.All 3.2 tower crane rotary mechanism with a normally closed or braking device, in the stop after the operation, the driver must remove the handle, release the brake for crane in the wind blowing in under the direction of rotation.3.3, the hook should be lifted to the minimum distance from the lifting wall, not more than 5m position, hanging on the hook is strictly prohibited. Not to take reliable measures, not by any means, limiting the boom rotate with the wind.
Q:What does "slewing up" and "under rotating" in the slewing form of a tower crane mean?
In short, when the tower rotates in the form of a tower, the tower is stationary (ie does not follow the rotation), and the form of the lower turn is the tower will rotate. As for the reasons, the main consideration is the actual needs.
Q:What is the scope of the installation and disassembly of self lifting tower cranes and the applicable range of the cost and the off-site transportation cost?
The installation and disassembly of the existing self rated tower crane, the first cost and the off-site transportation cost quota are divided by the lifting moment 1000kNm and 2000kNm of the jack up tower crane.
Q:Can the attached arm of the tower crane be welded?
The attached arm of a tower crane can not be welded and can only be bolted.Adhesion calculation of tower craneTower crane attachment (anchor) device structure, internal force and installation requirements in the use of narrative instructions so in the tower crane installation and use, the use of units can be executed according to the requirements, do not need to calculate, only when the tower crane installation position to the building from the over manual provisions, to increase attached rod (Zhi Chenggan) two, spacing or attached rod connected with a building when changing to attached calculation.
Q:What are the types of tower cranes?
The tower crane is divided into: fixed tower crane mobile tower crane self lifting tower crane mobile tower crane is divided into: rail type tire type automobile type self lifting tower crane is divided into: attachment type climbing uses: concrete with cage for loading and unloading installation general building mixed

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