Hydraulic lifting reverse method of chimney steel inner cylinder

Abstract

The invention relates to a hydraulic lifting reverse method of a chimney steel inner cylinder, which is mainly characterized in that the body of the chimney steel inner cylinder is divided into a plurality of cylinder sections being convenient for lifting along the height direction of the chimney steel inner cylinder, and each cylinder section is divided into a plurality of cylinder sheets according to the requirements convenient for roll bending manufacture; on the basis, the first section steel inner cylinder of the head cylinder of the chimney steel inner cylinder is assembled, and then a spiral expansion ring and a hydraulic lifting device are arranged in the section steel inner cylinder; after the first section steel inner cylinder is lifted by the height of the first section steel inner cylinder by utilizing the hydraulic lifting device, the subsequent cylinder sections are assembled and are in horizontal seam welding with the first section steel inner cylinder body of the head cylinder, thereby completing the installation of the first section steel inner cylinder of the head cylinder, and subsequently, the installation process of the first section steel inner cylinder of the head cylinder is repeated, enabling the subsequent steel inner cylinder sections to be installed section by section from top to bottom until the installation construction of all steel inner cylinders is completed. The construction method does not need high-altitude operation, has convenient operation and high construction speed and can effectively ensure the construction quality and construction safety. Meanwhile, the construction method can also save materials, lower loss and reduce cost.

Description

technical field [0001] The invention relates to a construction method of a chimney steel inner cylinder, in particular to a chimney steel inner cylinder hydraulic jacking and inversion method, which is suitable for installation and construction of a sleeve type chimney steel inner cylinder. Background technique [0002] In recent years, with the development of electric power construction, steel sleeve chimneys have gradually replaced brick-lined chimneys. At present, the installation of the steel inner cylinder of the chimney has used a method of air pressure jacking and inversion. Although this method has no additional load on the chimney outer cylinder and the foundation, this method needs to make the top of the steel inner cylinder into a closed container. After the lifting is completed, the removal of the closed container-type cover needs to be carried out at the head of the inner cylinder, which has a great safety risk; the jacking height is greatly affected by the air ...

AI Technical Summary

Problems solved by technology

At present, the installation of the steel inner cylinder of the chimney has used a method of air pressure jacking and inversion. Although this method has no additional load on the chimney outer cylinder and the foundation, this method needs to make the top of the steel inner cylinder into a closed container. After the lifting is completed, the removal of the closed container-type cover needs to be carried out at the head of the inner cylinder, which has a great safety risk; the jacking height is greatly affected by the air pressure, and the accuracy and difficulty of air pressure control are relatively large. Stability; the requirements for lifting equipment are: pneumatic equipment has strict requirements on instrument verification, and pneumatic equipment is easy to explode out of control; it is necessary to leave manholes or high-pressure gas pipe holes on the foundation wall, which will affect the design drawings

A hydraulic lifting and flipping method was also used. Although this method is stable and easy to operate synchronously, because the hydraulic lifting equipment is arranged on the head of the concrete outer cylinder, it is not convenient for inspection and maintenance when working at heights; due to the weight of the steel inner cylinder To the head of the concrete outer cylinder, it is necessary to reinforce the reinforced concrete outer cylinder in advance; and because the operator and the lifting equipment are not on the same operating surface, the quality requirements for the lifting equipment, steel hinges, and slings are high