the difference between flat head and pointed tower crane hanging in application
What are the differences between flat and pointed towers
The flat head tower crane is generally used in construction sites or bridge construction sites. The position of the hook is controlled by the rotation of the arm and the distance of the car. It can be used to hang objects in the turning radius, but the lifting ability is related to the position of the car.
The closer the tower is, the greater the lifting ability is. Its own lifting capacity is expressed in tons * meters. Therefore, to the far end of the arm, the lifting ability is very poor, and the range of lifting is relatively large.
The pointed tower is generally used in ports and ships. This kind of tower can be turned, but it can only be lifted within a different length of the angle at which the tip is raised. The lifting radius is relatively small, but the lifting capacity is basically unrelated to the position. The lifting ability is basically fixed.
Top 10 Dangerous Operations that May Cause Tower Hang Accidents
Tower lifting is the most commonly used lifting equipment on construction sites. It is a section of Tower lifting standards to form a tower, hence the name "tower hanging." It is mainly used for lifting steel bars, wooden gongs, and foot Guandeng materials for construction.
Safety is particularly important in the construction of the tower. Therefore, the following ten dangerous operations that can easily cause tower hanging accidents are summarized:
(1) Overloading
It is well known that any machinery has the limit of its load, and lifting equipment is prohibited because it must overcome the influence of gravity on lifting materials. Therefore, lifting operations of materials and raw materials that exceed the rated load of Tower lifting are prohibited.
(2) Leaning
Slant hanging refers to the sloping of the suspension road during the lifting process. This is also the fundamental reason for the major tragedies that occurred during the rush work. Therefore, in order to avoid accidents, attention should be paid to correcting the suspension road before the lifting operation..
(3) People on the suspension
Some construction workers like to "hitchhike", as the tower lifts the hanging objects and saves the "trouble" of taking the elevator or going upstairs. This behavior has caused many people to fall at high altitude during the lifting process and even pay for bleeding.
(4) Command signal is unknown
In site management, the commander's role is indispensable. The tower crane driver should note that when lifting operations, there is no clear command signal, do not act without authorization.
(5) Components buried in the ground
Due to the construction needs, the tower suspension has also become a device for the removal of certain underground components with its huge pull force.
However, given that some of the underground components are closely combined with the earth, the reaction force generated during lifting will cause the tower to bend and cause danger. situation, Therefore, such operations should also be avoided.
(6) Strong winds above level 6
The airflow speed of Class 6 winds is between 10.8 m/s and 13.8 m/s. Such a faster airflow is a certain risk for tower crane operations. Therefore, when it exceeds Class 6 strong winds, it should not be rushed. Such operations.
(7) Installation failure
The maintenance and control of Tower cranes are indispensable, especially when the installation device fails, it will often cause major safety accidents.
The light is too dark to see clearly
Because some projects need to be completed, tower lifting operations are also carried out at night when the light is dark. This is also very dangerous and should be prohibited.
(9) Bulk is too full or Unbound
Bulk is often "spilled" due to vibration during lifting operations, and the probability of accidents increases sharply if the load is too full or Unbound.
(10) The edge of the hanging object is not protected from hanging
The protective measures on the edge of the hanging object are very important. This is also an important content of the tower hanging qualification examination. If there is no protective measures, the hanging object will often pose a major threat to ground personnel and equipment once it falls at high altitude.
Installation of five steps for tower lifting: preparation, overall installation, wearing of wire ropes, erection of Tower body preparation, erection of Tower body
The tower is a symbol of the construction site. Its existence portends the rise of a tall building. So, how do these tall, tall, straight towers fit? I'm sure a lot of people are curious about that. In fact, the tower crane installation can be divided into five steps: preparation work, overall installation, wearing of wire ropes, erection of Tower body preparation, erection of Tower body.
(1) Preparatory work
Check whether the roadbed and track laying meet the requirements, lay the ground anchor, and determine the location of the anchor according to the position of the tower rotating and moving direction and the total height of the tower body. Ground anchors are divided into main ground anchors and auxiliary ground anchors.
The main ground anchor is the key to the tower's rise. The entire load of the rotating tower is borne by the main ground anchor, and the ground anchor is still needed when the tower is demolished. Therefore, it must be carefully laid to achieve the required bearing capacity. And do a good anti-corrosion treatment.
The center of the anchor wheel must be consistent with the center of the gauge to ensure that during the lifting process of the tower body, it always rotates along the center surface of the gauge, without causing eccentricity, so that the door frame is balanced.
The role of the auxiliary ground anchor is to relax the wire rope with the rotation when the tower is lifted. The anchor here is used as the anchor point of the wire rope to prevent the tower from falling in the opposite direction during the rotation process.
(2) Overall installation
According to the procedures required by the manual, the walking mechanism, door frame and pressing iron are installed. The lifting arm is inserted on the support shaft of the door frame platform, and the tower body is lying down and assembled on the wooden stack, and the tower body and tower cap are assembled so that the tower body is mounted on the wooden raft. Its axis is roughly parallel to the ground.
(3) Wear wire ropes
The length of the rope and the distance between the two pulley groups shall be calculated and determined.
(4) Standing tower preparation
The electrical equipment such as controller and limited-position switch should be inspected. The active control disk in the operating room should be removed and installed on the outdoor bracket to facilitate the operation of the tower.
Tighten the rail clamp and wedge the Anti-Slip wedge under the running wheel.
In order to strengthen the stiffness of the door frame, cross supports can be tied on both sides of the door frame.
The duties of each post should be stipulated before starting, strict division of labor and command and liaison signals. The supervision of the main ground anchor should be the responsibility of an experienced crane. When an abnormal phenomenon such as looseness is found, immediately stop to take measures(additional iron pressure can be added to the ground anchor).
Start the roll up machine, so that the tower body left about 200mm of wooden pallets, immediately stop, check the force of the components in good condition.
(5) Erect tower
After inspection, confirm that the situation is normal, continue to start the hoist, so that the tower body is stable and erected, and the cable at the auxiliary Anchorage is loosened.
After the tower stands to 60 °, the hoist will gradually slow down with the change in the center of gravity of the tower. When the center of gravity of the tower is close to the installation hinge, the hoist will stop working and use a mobile crane to tighten the fuse rope and rely on the weight of the tower. Slowly landed on the pre-cushioned cushion. After the tower is stable, tighten the fuse rope to make the tower slightly crooked, then withdraw the cushion layer, and then loosen the fuse rope to stabilize the tower.
