SU459429A1 - The method of installation of vertical structures - Google Patents

Description

The invention relates to the field of installation, in particular to a method of mounting vertical structures.

Known methods of mounting vertical structures by pre-slinging designs boom cranes with the subsequent lifting of the upper part while moving the lower part with a separation from the ground.

The aim of the invention is to provide constant loads on cranes.

To do this, according to the proposed method, the construction of the lines at the points opposite to the central longitudinal axis, which are placed on the conventional straight line connecting them and passing not lower than the center of the structure.

The proposed method is illustrated in the drawing. which shows the three positions of the vertical structure during its installation,

To the vertical structure 1 lying on the sleeper displays 2, the slinging devices 3 and 4 are fastened. The slinging device 3 is placed in the upper part of the structure 1 below its central longitudinal axis, and the Slinging device 4 is located in the lower part of the apparatus above its longitudinal axis so that The line, conditionally connecting the slinging points, passes through the center of gravity of the apparatus or above it, which ensures the stability of the mounted structure during the lifting process. The fixture 3 lines on the hook of the crane 5, and the fixture 4 - on the hook of the crane 6, then begin to rise

of construction 1 by crane 5 with simultaneous tearing off by crane of the bottom of the structure and dragging it to the foundation 7. At the same time, regardless of the position of the structure in the process of moving it from horizontal to vertical, the loads on the cranes do not change and are equal to:

. P

R.

R,

/ 1 + / a fi + I, / 1 where PI is the load on the crane 5; RZ - load on crane 6; Q is the mass of the mounted structure; / 1 and / 2 are the distances from the center of the sheet to the axes of the slinging devices 3 and 4.

With / 1/2 PI. If, then the ratio of the loads PI and P-i remains unchanged during the whole lifting cycle, that

completely eliminates the overload of one of the cranes.

When lifting the vertical structures of the proposed method, the crane 6 carries out not only pulling the bottom of the structure along

as far as withdrawing it from the horizontal position

in the vertical, but at the same time perceives the second part of the load from the mass of the apparatus, equal to Р2, up to the setting of “I + a

ki structures in the design position on the foundation 7.

Subject invention

The method of installation of vertical structures by preliminary slinging of the structure with jib cranes with the subsequent lifting of the upper part while simultaneously moving the lower part away from the ground, characterized in that, in order to ensure constant stresses on the cranes, the structure of the slings in opposite to the central longitudinal axis points that are located along the conditional straight line connecting them and the structure passing not lower than the center of gravity.