Auxiliary device for preheating and heat preservation of weld joint of pressure steel pipe and construction method

Abstract

The invention discloses an auxiliary device for preheating and heat preservation of a weld joint of a pressure steel pipe and a construction method. The auxiliary device comprises a first stand column, a second stand column, a first semicircular bracket and a second semicircular bracket, the first semicircular bracket is fixed in the height direction of the first stand column, and the second semicircular bracket is fixed in the height direction of the second stand column; semicircular heating plates are arranged on the inner arc wall surface of the first semicircular bracket and the inner arc wall surface of the second semicircular bracket, supporting devices are arranged at the bottoms of the first stand column and the second stand column, and the supporting devices are supported on the ground; and when the weld joint of the pressure steel pipe is preheated or insulated, the two ends of the first semicircular bracket and the two ends of the second semicircular bracket are in one-to-one butt joint, and the semicircular heating plate of the first semicircular bracket and the semicircular heating plate of the second semicircular bracket wrap a pipe body of the pressure steel pipe. The safety and stability of heating operation are improved.

Description

technical field [0001] The invention belongs to the technical field of pressure steel pipe welding, in particular to an auxiliary device and construction method for preheating and heat preservation of pressure steel pipe weld seams. Background technique [0002] Preheating and post-welding thermal insulation auxiliary device for pressure steel pipes, commonly known as heating arches, is assembled and welded by square steel. It is applied to pressure steel pipe welding to greatly improve construction efficiency. It also ensures the heating temperature of pressure steel pipe welding and increases the pressure. The qualification rate of steel pipe welding reduces the economic cost of pressure steel pipe production. [0003] In the power generation system of a diversion-type hydropower station, the penstock is the center connecting the storage dam and the water turbine unit in the powerhouse. Under the premise of high water head and high pressure, the welding performance of the ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides an auxiliary device and construction method for preheating and heat preservation of the penstock weld seam, which solves the problem that the heating plate used for the preheating and heat preservation of the penstock steel pipe is currently fixed. Instability, which leads to the problem of hidden dangers in construction

Images