Hydraulic lifting inverted construction method for steel inner cylinder of chimney in thermal power plant

Abstract

The invention discloses a hydraulic lifting inverted construction method for a steel inner cylinder of a chimney in a thermal power plant, which comprises the following steps: (1) dividing the steel inner cylinder into a plurality of cylinder sections, and dividing each cylinder section into a plurality of cylinder sheets; (2) manufacturing a jack stand base in the steel inner cylinder, and mounting a hydraulic lifting device and a construction platform on the jack stand base; (3) beginning to assemble the first cylinder section of the steel inner cylinder, welding a plurality of sets of door-shaped clips on the inner wall of the first cylinder section along a circumferential direction, and clipping the horizontal annular beam by the door-shaped clips; (4) lifting the assembled cylinder section to the height of the first cylinder section by using the hydraulic lifting device, assembling a next cylinder section and welding the next cylinder section with the previous cylinder section; (5) cutting off the door-shaped clips and transferring and mounting the door-shaped clips and the horizontal annular beam to the corresponding position of the next cylinder section; and (6) repeatedly circulating the steps (4) and (5), and mounting the subsequent cylinder sections in turn. The method has the advantages that: the construction cost is low; the stress is definite, the operation is simple and convenient, and the safety factor is high; and the construction period is short and the project quality is high.

Description

technical field [0001] The invention relates to a construction method of a steel inner cylinder of a chimney, in particular to a construction method of a chimney steel inner cylinder of a thermal power plant by hydraulic lifting and flipping. Background technique [0002] At present, there are three feasible installation methods at home and abroad for the steel inner cylinder of the chimney with a height of more than 200m in thermal power (thermal) power plants: 1. "Pneumatic jacking and inversion method"; 2. "Steel cable hydraulic lifting and inversion method" 3. "Hydraulic jacking and flipping method". [0003] 1. Air pressure jacking and flipping method: With compressed air as the power and a special inner base as the support, the steel inner cylinder with the top seal and the inner base form the relationship of "cylinder and piston". This method has a large amount of welding work on site, and it is difficult to coordinate synchronously with the hoist traction and air pr...

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Problems solved by technology

This method has a large amount of welding work on site, and it is difficult to coordinate synchronously with the hoist traction and air pressure jacking. The jacking height increases, and the center of gravity of the steel inner cylinder rises, which is prone to twisting and shaking, and the stability is poor.

[0004] 2. Cable-type hydraulic lifting and inversion method: Supported by the steel platform (or self-made steel beam) on the top of the chimney outer cylinder, using the jack arranged on it, the steel inner cylinder is lifted through the flexible steel strand, but the construction equipment is once The cost is high, and the requirements for the outer cylinder, the top steel platform, and the jack support steel beam are high, and it is inconvenient for construction workers to go up and down

In this method, in order to ensure that the expansion ring is fastened against the inner wall of the steel inner cylinder, in addition to the screw jack installed at the gap between the two semicircular arc beams, a circle of horizontally arranged jacks is also required on the inside of the expansion ring. The jack is used for jacking, so there are more construction equipment and higher costs; and because the force transmission between the expansion ring and the steel inner cylinder is mainly in the form of friction, it is difficult to control the top pressure and pressure uniformity of the expansion ring

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