【Daily Discussion】Utilities - Civil Engineering - 20210601

When lifting columns using the rotation method, the layout of the columns should be such that their footings are as close to the foundation as possible. The binding points of the columns, as well as the centers of the footings and the foundation, should all lie on an arc with the same radius from the crane. The rotary method for lifting columns results in low vibration and high production efficiency, but it requires high mobility from the crane. This method is suitable when using crawler cranes, truck cranes, and tire cranes. When lifting a column using the sliding method, the crane raises only the hook; the boom does not rotate. As the hook rises, the top of the column rises as well, and the base of the column slides upward along with it. Once the column is upright, it is lifted off the ground and rotated above the foundation cup, after which it is inserted into the cup. Lifting columns using the sliding method causes significant vibration, but only one action – lifting the hook – is required during the lifting process. This method is often used when lifting columns with a single-leg jib or a A-frame jib ； Additionally, for some long and heavy columns, this method is also commonly used to facilitate construction, layout, and lifting.

The binding point of the column, the center of the column foot, and the center of the foundation should all lie on an arc with the same lifting radius as that of the crane.

When lifting a column using the rotation method, the planar arrangement of the column should ensure that the binding point, the center of the column foot, and the center of the foundation cup lie on the same arc – an arc with a radius equal to the lifting radius R – with the column foot positioned closer to the foundation.

Requirements for the planar arrangement of columns: 1. Rotation method: Three points must lie on the same arc, that is, the binding point, the center of the column foot, and the center of the column foundation cup must all be on the same arc. On the arc with radius R, which is the lifting radius of the crane, the column foot is located near the base cup opening. 2. Gliding method: The two points lie on the same arc, that is, the tying point and the center of the base cup’s opening are on the same arc. On the arc with a radius of R equal to the crane’s lifting radius, the tying point is located near the base cup opening.

1. Rotation method: The three points lie on the same arc, that is, the binding point, the center of the column foot, and the center of the column foundation cup all lie on the same arc. On the arc with radius R, which is the lifting radius of the crane, the column foot is located near the base cup opening. 2. Gliding method: The two points lie on the same arc, that is, the tying point and the center of the base cup’s opening are on the same arc. On the arc with a radius of R equal to the crane’s lifting radius, the tying point is located near the base cup opening.

(1) Rotation method: The three points lie on the same arc, that is, the binding point, the center of the column foot, and the center of the column base are all on the same arc, which is an arc with a radius of R equal to the crane’s lifting radius. The column foot is close to the foundation. (2) Gliding method: Two points on the same arc, that is, the tying point and the center of the column base are on the same arc. On the arc with radius R, which is the lifting radius of the crane. The binding point is close to the foundation.

Requirements for the rotation method: The three points must lie on the same arc, that is, the tying point, the center of the column foot, and the center of the column foundation cup must all be on the same arc. On the arc with radius R, which is the lifting radius of the crane, the column foot is located near the base cup opening. Requirements for the sliding method: the two points must lie on the same arc, that is, the tying point and the center of the base cup’s opening must be on the same arc. On the arc with a radius of R equal to the crane’s lifting radius, the tying point is located near the base cup opening.

1. Rotation method: The three points lie on the same arc, that is, the binding point, the center of the column foot, and the center of the column foundation cup all lie on the same arc. On the arc with radius R, which is the lifting radius of the crane, the column foot is located near the base cup opening. 2. Gliding method: The two points lie on the same arc, that is, the tying point and the center of the base cup’s opening are on the same arc. On the arc with a radius of R equal to the crane’s lifting radius, the tying point is located near the base cup opening.

Requirements for planar layout using the rotation method: The column foot should be adjacent to the foundation. The binding points of the columns, as well as the center of the column foot and the center of the foundation, must all lie on an arc with a radius equal to the distance from the crane’s stopping point; in other words, these three points must be on the same arc. Requirements for the plan layout using the sliding method: The binding points should be located near the foundation, and the binding point of the column, along with the center of the foundation, should lie on the same arc of the lifting radius – in other words, the two points should be on the same arc.

When lifting columns using the rotation method, the layout of the columns should be such that their footings are as close to the foundation as possible. The binding points of the columns, as well as the centers of the footings and the foundation, should all lie on an arc with the same radius from the crane. The rotary method for lifting columns results in low vibration and high production efficiency, but it requires high mobility from the crane. This method is suitable when using crawler cranes, truck cranes, and tire cranes. When lifting a column using the sliding method, the crane raises only the hook; the boom does not rotate. As the hook rises, the top of the column rises as well, and the base of the column slides upward along with it. Once the column is upright, it is lifted off the ground and rotated above the foundation cup, after which it is inserted into the cup. Lifting columns using the sliding method causes significant vibration, but only one action – lifting the hook – is required during the lifting process. This method is often used when lifting columns with a single-leg jib or a A-frame jib ； Additionally, for some long and heavy columns, this method is also commonly used to facilitate construction, layout, and lifting.