Method for welding tower in vertical assembling mode by utilizing jacks and crane

Abstract

The invention discloses a method for welding a tower in vertical assembling mode by utilizing jacks and a crane. The method includes the following steps that firstly, the straightness of all sections of the tower is checked, an end socket of each section of the tower is cut off, and grooves are formed in the end portions of opposite openings of all sections of the tower in a cutting mode; secondly, a lower tower is fixed on a foundation, and the perpendicularity and the elevation of the lower tower are aligned; thirdly, a plurality of first supporting tools are evenly distributed on the peripheral wall of the lower tower, the jacks are distributed on the first supporting tools respectively and adjusted to the same horizontal position, and force measuring instruments are arranged on the jacks; fourthly, a plurality of second supporting tools are evenly distributed on the peripheral wall of the upper tower; fifthly, the upper tower is craned by the crane so that all the second supporting tools can be arranged on the jacks correspondingly, stress on the tops of the jacks is adjusted, the grooves of the end portions of the upper tower and the lower tower are assembled, the perpendicularity of the upper tower and the assembling gap of the upper tower and the lower tower are adjusted, the total carrying capacity of the jacks is N, the carrying capacity of the crane is F, and the weight of the upper tower is Q which is kept to be equal to N+F; sixthly, several welders use the same welding current and meanwhile perform symmetric welding, and therefore welding joints are welded in a multi-layer mode.

Description

technical field [0001] The invention relates to a method for vertical butt welding in the air of tower equipment in the energy and chemical construction industry, and belongs to the field of welding technology. Background technique [0002] As the design of production equipment becomes larger and larger, the transportation of many equipment in construction projects has become a major problem. Therefore, many more sophisticated large-scale equipment choose on-site butt welding, and on-site pairing is divided into horizontal pairing and vertical pairing. The method of horizontal grouping and overall hoisting is relatively simple, but for high-precision equipment, it may cause deformation of the equipment body. The segmented vertical aerial assembly can better control the deformation of the equipment body and meet the requirements of precise installation of precision equipment. However, during the construction process, there are problems such as large welding deformation, diffi...

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Problems solved by technology

[0002] As the design of production equipment becomes larger and larger, the transportation of many equipment in construction projects has become a major problem. Therefore, many more sophisticated large-scale equipment choose on-site butt welding, and on-site pairing is divided into horizontal pairing and vertical pairing. The method of horizontal grouping and overall hoisting is relatively simple, but for high-precision equipment, it may cause deformation of the equipment body

The segmented vertical aerial assembly can better control the deformation of the equipment body and meet the requirements of precise installation of precision equipment. However, during the construction process, there are problems such as large welding deformation, difficult control of verticality, and difficult welding for some materials, especially Aluminum towers and stainless steel towers, but some fields that use aluminum and stainless steel towers have very high requirements for verticality of the towers, such as the inner tower of the cold box of the air separation device. It is well known that the core equipment of the large air separation device is The verticality of the column and pipeline designed in the cold box directly affects the purity and output of the product. Generally, the verticality after installation is less than or equal to 0.5mm / m and the maximum shall not exceed 15mm. The hoisting vertical butt welding method has no connection between the upper and lower towers, and is unstable. During the welding process, verticality and misalignment often occur.

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