E1515 Tower Crane Lease Rent Hire

E1515 Tower Crane Lease Rent Hire

Series , Luffing jib Crane, Topkit tower crane, Hammer head tower crane, Topless tower crane, Flat top tower crane,

Model,

Jib length,   m

Max load,   Ton

Tip load,    Ton

Type, Stationary , Inter climbing ,Travelling,

And other Famous brand, Model ,  Depend on the brand , Model Ability , Year , Height and etc u want.

We have large units store.  From 6Ton to 20Ton. Store and Service all over the world.

Mean time , We supply all the Spare Parts U may need as follow,

Masts Section ,  Anchor Frame, Collar ,Tie , Fixing angle , Cabin, Hoist mech. Trolley mech. Luffing Mech. Slewing Mech. Pulley and etc.

E1515 Tower Crane Lease Rent Hire

The reasons, hazards and preventive measures for loosening connection bolts of standard section of tower crane are explained

After the bolt is loose, when the bending moment produces a tension in the main limb of the standard segment in the bolt orientation, the contact surface of the two standard segments will produce a gap. For a tower crane with a height of 30m and no adhesion, a clearance of 0.1mm is generated at the connection of the second and third standard sections in the lower part, and the horizontal displacement at the root of the lifting arm will increase by 2mm.

If a gap is generated at multiple contact surfaces, the tower body deformation will increase sharply, which is more unfavorable to the tower body stress and even leads to tower collapse accident. Is loose, in the upper tower crane under the action of load.

This should be fixed edge together two standard section of the contact surface will produce axial reciprocating movement, had no impact load of bolt connection structure between the impact load, bolt connecting structure of load effect and greatly increases, easily lead to the breakage of the bolt and the connection structure, even the towers are broken.

Thus it can be seen that the standard joint bolt is not found or placed in time, no matter how dangerous

Preventive measures for loose connection bolts of standard section of tower crane

According to the analysis of the above reasons for bolt looseness, the following preventive measures are formulated

E1515 Tower Crane Lease Rent Hire

1. The tower crane management unit shall strengthen management and urge the tower crane operation team (or special maintenance team) to regularly check and tighten the standard bolts. As a rule of thumb, check the standard bolts at least once a week, and tighten them in case of looseness.

2. Tighten standard section bolts in a reasonable way. Commonly used rotating boom, successively tighten the bolts on the compression side of the tower body. Check and tighten in daily use. When the tower crane is under no load, move the trolley to the arm root, check and tighten the bolts on the balance arm side from bottom to top.

 After this side is finished, rotate the crane arm 180 degrees, check and tighten the bolts on the other side from top to bottom until all of them are finished. After each jacking and adding section, check and tighten the newly installed standard section bolts once according to the above method.

E1515 Tower Crane Lease Rent Hire

3. Strengthen the disclosure of safety technology during the installation of tower cranes. Be sure to explain to the installer that the pre-tightening force of the standard section connection bolts is not enough, the theoretical pre-tightening torque of the standard section connection bolts of the tower crane installed and the correct tightening sequence of the standard section bolts.

4. Strict management of tower cranes. All original accessories of tower cranes must be reasonably omitted and substituted, especially for functional components.

5. The mechanical management department of the construction unit is checking the tower crane, and someone must be on board to check it carefully and carefully, and report the problems to the tower crane supervisor in time, and rectify the hidden dangers in time.

E1515 Tower Crane Lease Rent Hire

Tightening the standard bolt of tower crane is easy to say but difficult to do in practice. I hope that the majority of tower crane manufacturers and supporting manufacturers, construction machinery research units, to enhance the understanding of this aspect, study a good method and tools, the construction unit to strengthen management, to ensure the safe use of tower cranes

E1515 Tower Crane Lease Rent Hire

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