Square open jack

Abstract

The invention relates to a square open jack. The jack is mainly composed of two bottom plates including an upper bottom plate and a lower bottom plate, four movable diagonal braces and one screw. During contraction, the diagonal braces are almost parallel to a bottom plate of the screw, and the jack is X-shaped in the semi-opening state and square in the maximum opening state. The support surfaceis long in the front and rear direction. The jack cannot fall over and is suitable for non-flat places on a construction site. Falling can be avoided by means of a safety lock. Workers can leave the jack for other operations, the personal safety is improved, and the jack saves labor and brings convenience to construction.

Description

technical field [0001] The invention relates to a square spread jack and relates to the field of construction equipment, in particular to a portable jack. Background technique [0002] In building construction, it is often encountered that pre-components must be installed in the bundled steel tendons, and the installation position of the pre-components often conflicts with the steel bars. At this time, it is necessary to squeeze the position of the steel bars to accurately place the pre-components, which have been bundled. The steel tendons are often difficult to operate, and it is inconvenient to use crowbars in the narrow space on the scaffold, and it is extremely difficult to encounter thick steel bars. Sometimes it needs to be operated at high altitude, which brings personal danger. [0003] At present, the jacks used in the society are two-point spread or herringbone type, which cannot be used horizontally. However, when there are more steel tendons to be stretched, the...

AI Technical Summary

Problems solved by technology

[0002] In building construction, it is often encountered that pre-components must be installed in the bundled steel tendons, and the installation position of the pre-components often conflicts with the steel bars. At this time, it is necessary to squeeze the position of the steel bars to accurately place the pre-components, which have been bundled. The steel tendons are often difficult to operate, and it is inconvenient to use crowbars in the narrow space on the scaffold. It is even more difficult to encounter thick steel bars. Sometimes it is necessary to operate at high altitude, which brings personal danger.

[0003] At present, the jacks used in the society are two-point spread or herringbone type, which cannot be used horizontally. However, when there are more steel tendons to be stretched, they must be placed horizontally. The surface to be opened is also wide, and the steel bars themselves will swing within a certain range. , or due to the sudden breakage of the wire, the jack will fall off and bounce during use, which will bring personal safety

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