Ultra-large type lower guard plate subsection mounting method

Abstract

The invention discloses an ultra-large type lower guard plate subsection mounting method which comprises the following steps that 1, a plurality of supporting skeletons arranged in the horizontal directions are erected on the inner sides of lower guard plates, and sealing plates are arranged at the lower ends of the flow passing surfaces of the guard plates; 2, first segments of first sections ofthe lower guard plates are hung in accordance with the supporting skeletons; 3, a construction platform is established at the peripheries of the lower guard plates, and mounting of second sections ofthe lower guard plates is carried out; and 4, horizontal specially-shaped plates and specially-shaped plates between fixed guide vanes are mounted according to limiting devices, the specially-shaped plates are in contact with excircle spigots of foundation rings, then arc transition sections are mounted, and finally welding of welding joints is carried out. On the premise of ensuring the quality and quantity, a mounting task of the lower guard plates can be completed economically, safely and efficiently.

Description

technical field [0001] The invention relates to a method for installing a lower guard plate, in particular to a segmental installation method for an ultra-large lower guard plate. Background technique [0002] Sichuan Leshan Angu Hydropower Station is currently the largest axial flow propulsion unit under construction. The installed capacity of the power station is 772MW. It is equipped with four axial flow propeller generators with a single unit capacity of 190MW and one 12MW axial flow propeller turbine. Generator set; the large frame ring deflector is composed of 27 slanted guards, 29 transitional arcs and 24 special-shaped deflectors; since the main structure is a slanted guard, it is collectively referred to as the lower guard ;The maximum size of the lower guard plate is about 7560mm, and it is not segmented; with the existing top-down installation method, the gap between the top of the guard plate and the first-stage concrete is small, and the installation quality of ...

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Problems solved by technology

[0002] Sichuan Leshan Angu Hydropower Station is currently the largest axial flow propulsion unit under construction. The installed capacity of the power station is 772MW. It is equipped with four axial flow propeller generators with a single unit capacity of 190MW and one 12MW axial flow propeller turbine. Generator set; the large frame ring deflector is composed of 27 slanted guards, 29 transitional arcs and 24 special-shaped deflectors; since the main structure is a slanted guard, it is collectively referred to as the lower guard ;The maximum size of the lower guard plate is about 7560mm, and it is not segmented; with the existing top-down installation method, the gap between the top of the guard plate and the first-stage concrete is small, and the installation quality of the upper guard plate can be guaranteed; but the second The installation quality and pouring progress of the long-term concrete cannot be guaranteed; at present, there is no installation method suitable for the super large lower guard plate in this project

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