Learn more about the process of creating spreader bar rigging

Learn more about the process of creating spreader bar rigging
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The invention and the lifting spreader bar design relates to crane construction. The pipe spreader beam widener comprises of first and second hooks connected with a beam. There is a coupler section connector or a swivel connector at every end. Each of crane spreader bars elements has a possibility of extending in a direction away from the center, with or without an angle between the two parts. The spinner extender also includes an actuator mounted between the articulation couplers, which adjust the angle between the outgoing parts of the two articulated connectors. The lifting crane contains spreader bars for lifting with adjustable length, fixed between a pair of brackets of additional boom lifts. Spreader bar design calculation took a while in its designers and engineers.

To fix (assemble) the crane, attach the boom to the swivel base and the spacer to the boom, secure the brackets of the additional boom arms between the spacer and the turntable, fix the expander with the adjustable length between the slings of the additional boom arms, the expander is the first length when it is fastened between the slats of the additional lift boom, increase the length of the expander to a second length greater than the first length, after fixing the expander between the strips from the assembly of the crane.

Peculiarities of the cargo spreader bars creation

A tower crane is a lifting machine that is used to build various buildings and structures, both civil and industrial. These machines come with different designs and different characteristics.

Tower crane arrangement

The main elements of the tower crane are actually a tower and an arrow. The boom is used to lift the load and is placed horizontally. The tower of the crane is a supporting element, which is located vertically. Also, on the top of the tower of this crane the head is installed vertically, intended to support the rope. At the top of the head, there is one of the blocks of a pulley block. On the opposite side of the boom, there is the cargo area also in the horizontal position. On this site, some models of cranes, a winch, and a counterweight are installed. At the bottom of some cranes, the ballast joins the tower. Ballast, together with a counterweight, ensures the stability of the machine during operation.

The tower and boom of the crane are made of metal (welded profiles, such as corners, channels, etc.). The lifting of the load is ensured by a steel rope, which is driven by a hoisting mechanism, a winch. The crane is also equipped with a chain block system. At the end of the rope, a hook suspension is installed, which can be suspended from the rope block at the edge of the boom (lifting stele), or on a freight trolley that moves along the rails on the boom (an unachievable boom), its movement provides an additional drive device.

Tower cranes, in particular, have different installation methods. Tower cranes are movable, non-transferable, attachable and others. Movable tower cranes are equipped with a mobile platform, on which the tower is installed. The movement at such cranes is provided by drive wheels (all crane wheels have an individual drive) and moves along the railway rails. To install a stationary tower crane, first with the help of an excavator, a small pit is used, into which a tower is installed. Then, it is concreted there. In the case of an attached crane, it is attached to the erected building using special fastenings. Usually, such cranes have the ability to increase the height of the tower, by adding a section by section. Typically, these machines are used to build skyscrapers.

The arrows of tower cranes are also different. They are lifting, immovable, articulated.

Also, on some tower cranes, the turntable is placed under the boom attachment point (in this case, the crane has a non-rotating tower) or under the tower installation point (in this case, the crane turns completely). The turnstile of the crane is represented by a supporting and rotating circle and a turning mechanism.

Tower cranes operate on electricity, from high-voltage wires. After the completion of the work, they, as a rule, dismantled.

Features of tower cranes

The tower crane is an indispensable device for creating tall buildings. These devices are designed to mechanize the installation and construction work in the construction of industrial and residential buildings. Tower cranes are also used for lifting various building structures weighing approximately 10 tons.

The principles of operation of cranes

Tower cranes, which have an upper turn and reach of an arrow up to 60 m, are produced in stationary and mobile versions. From their predecessors, modern designs are characterized by greater carrying capacity and mobility. In addition, tower cranes are easy to transport and mount.

In terms of operation, tower cranes can only be used in areas where the air temperature does not exceed +45 degrees.

For the operator, good working conditions are also created. He works in the cabin, which is equipped with a household compartment.

Advantages and disadvantages of different types of self-propelled cranes

Crawler cranes, in contrast to truck cranes, have greater load capacity and cross-country capability. Caterpillars have a lower specific pressure on the ground, which is due to the large surface of the support. Also, caterpillars allow to easily overcome the impassability and move on a weak ground. The weight of the crawler crane is larger than that of the truck crane, but this gives an advantage in carrying capacity. Therefore, if it is necessary to move heavy loads at the construction site, the crawler type of cranes is chosen.