Application notice of tower crane

A tower crane should be used, here Xiaobian verbose for everyone a detailed summary, including safe driving, machine hand, safety maintenance, use attention point, we hope to be useful.

Safe driving

The safety problem of tower crane is directly related to the construction schedule and quality of the project, as well as the image, reputation and social influence of the enterprise. According to the author's experience, the main points of tower crane safety use are as follows, for reference only.

The use of tower crane, issued by the state competent authorities shall abide by the rules and regulations, but also comply with the relevant provisions in the manual: the crane working environment temperature is -20~40 degrees Celsius, the maximum working pressure is 205N/m2, when should stop using the wind speed exceeds the level 6.

The same construction site to install more than two sets of tower crane, tower crane should pay attention to the mutual position, take the elevation of different operations, in order to avoid the tower crane jib, balance arm collision accidents; safety device of tower crane, luffing and slewing height, quality and torque limiter, of which the last two items more important, if the detection of two unqualified, will be regarded as the unqualified, because it plays a role to ensure the safety and prevent the tilting of the tower crane.

As a construction site, the tower crane torque limiter failure or to replace the operating personnel mistakenly believe that daily only hanging 800-1000kg materials, not what the risk, the results in a process of lifting materials, because of the construction site is narrow, hanging by the operator sight blocked, hanging objects hanging on building the steel frame, caused by tower crane shaking, was the occurrence of major accidents, thanks to the ground work riggers promptly notify the operator immediately stop to avoid rollover accident of tower crane appeared. It can be seen that all the safety devices on the tower crane are essential, must be checked regularly, and ensure that all the safety devices are in good condition, sensitive and reliable.

Selection of machine hand

Selection of tower crane tower crane requirements: the coverage area (i.e., arm length, arm and the minimum amplitude is maximum) the quality, speed, height, independent tower crane maximum lifting height and other technical parameters are required, according to the actual situation and the safety requirements of the construction site and determine. If the selected capacity is too large, it will cause waste of resources; on the contrary, it brings all the problems of use and safety.

Requirements for operators: strong sense of responsibility, good technology.

Because in the process of using the tower crane, the fault will inevitably appear various, but first find the fault site in general should be first-line operator, if the operator can discover and deal with faults, so not only can guarantee the safety of construction, but also can save the maintenance time, convenient management, on the other hand, it is difficult to inference.

Main points of use

Lifting mechanism: the lifting motor is generally the double bundle or three quick motor, more blocking operation is not allowed in use, the lifting motor speed can only be used for light load or empty hook lifting, long time is not allowed to run at low speed, low speed continuous operation time of not more than 5min, in order to avoid motor overheating and damage. The operation principle is that the high speed light load or heavy load and low speed.

Rotary mechanism and hydraulic coupling: the correct operation principle of slewing mechanism is: low gear or inching start, stop before stability can turn on anti car, can not use reverse car to brake. Otherwise, the reducer of hydraulic coupling is damaged by the big impact, even the shell is broken, and the inertia torque of the tower body is also increased.

Although the hydraulic coupler has overload automatic protection function, but also must correct operation, can extend its life. If the tower crane rotation speed slowed down obviously, generally for coupler lack of oil, first should check the liquid level, if not enough, should be in time to fill the oil, if the amount of fuel is too large, will increase the inertia force when starting, lose the buffer safety protection role, also can cause shell rupture. The normal working temperature of hydraulic coupler shell should be no more than 80 degrees centigrade. The brake of slewing mechanism is only used when the wind is affected and the parking is unstable. Under ordinary circumstances, the emergency brake can not be used easily, otherwise it will increase the extra torque of the tower body and even distort the body of the tower.

Slewing bearing is one of the most important parts of tower crane, and it mainly bears the overturning moment and vertical load. After failure, it is very difficult to disassemble and replace, and the loss is great. Therefore, the maintenance and inspection must be done carefully and carefully. Every working 200H must be injected with high grease once, until the lubrication is seeping out of the slewing bearing surface. The slewing bearing is connected by high strength bolts. If the pretightening force is not enough, or the long-term operation is not checked and not fastened, all the looseness will occur. If the individual bolts loose, it will cause the other bolts overload, the consequences will be unimaginable.

Routine maintenance

Of course, don't forget to run out of maintenance. Maintenance is often the most important, but also the most easily overlooked an important link, a lot of people used to run out is still on the side, until that day remembered, in a big clean-up, this is not.

Maintenance of mechanical parts shall be: to organizations and agencies of the brake operation, all the connected bolts fastening parts, wire rope inspection, failure should be excluded, check the mechanism of connecting bolts, welds and components of the working condition of the paint on the fastening and timing.

Maintenance of hydraulic system: add or replace hydraulic oil on time, and check tubing and its joint, safety valve, hydraulic pump and hydraulic cylinder, etc., and find out problems should be dealt with promptly.

Electrical system maintenance: wire and cable should be no damage, safety device travel switch must be reliable, grounding protection resistance to meet the requirements.

Lubrication work: the lubrication condition of each part of the tower crane should be checked regularly, the lubrication work should be done periodically, and the lubricant should be added or replaced on time.

In order to ensure the normal work of tower crane and ensure the safety of man machine, it is necessary to do daily maintenance work with the six major contents of inspection, adjustment, cleaning, fastening, lubrication and supply as the center.