Transferring and mounting method for AP1000 nuclear power station main pump main bolts

Abstract

The invention relates to a building method for an AP1000 nuclear power station, and provides a transferring and mounting method for AP1000 nuclear power station main pump main bolts to improve transporting and mounting efficiency and safety of the main bolts. After a main pump is placed in position, a top assembly for mounting the main pump is dismounted, and a main bolt lifting device is mounted on an annular rail; a hoisting device is arranged on a vertical support of a steam generator; a main bolt transporting tool is used for transferring the main bolts to the position below the hoisting device, and the main bolt transporting tool comprises a supporting base and a positioning frame, wherein wheels are arranged at the bottom of the supporting base, and the positioning frame comprises a mounting plate provided with a main bolt mounting hole; a hoisting rope is mounted on the hoisting device, and the main bolts are hoisted to the main bolt lifting device; and the main bolt lifting device is used for lifting the main bolts to a mounting position for mounting. By transferring and mounting the main bolts through the method, transferring and mounting efficiency is high, and safety is high.

Description

technical field [0001] The invention relates to a construction method of an AP1000 nuclear power plant, in particular to a method for transferring and installing a main bolt of a main pump in the AP1000 nuclear power plant. Background technique [0002] When installing the main pump in a nuclear power plant, after the main pump is in place, it is necessary to install 24 main bolts with a single weight of 86Kg and a length of 1.25m around the pump casing of the main pump. [0003] At present, when installing the main bolts of the main pump in the AP1000 nuclear power plant, in order to facilitate the construction, the ring-shaped main pump installation vehicle used for the installation of the main pump is directly refitted, and the top of the main pump installation vehicle is used to install the main pump. The components are disassembled, and the ring track and the main bolt conveying device are assembled on the middle car of the main pump installation vehicle to form the mai...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the main pump installation vehicle is refitted into the main bolt installation transport vehicle. Although the main bolt can be transported to the bottom of the main pump and the installation of the main bolt can be completed, when the main bolt is transported, repeated disassembly and assembly are required. It is cumbersome, the transportation efficiency is low, and it is easy to cause damage to the main pump installation vehicle and related parts in the bolt lifting device

During the process of transferring the main bolt 5 from the hoisting port of the chamber to the bottom of the main pump with a semi-circular trolley, due to the heavy weight of the main bolt 5, it is easy to cause the semi-circular trolley to collapse due to the excessive weight of the upper part. If it overturns, it will even cause damage to the staff and other items at the transfer site, and the safety is low

In addition, when the main bolt 5 is locked on the main bolt support frame 4 for transshipment, once the main bolt 5 is not locked firmly, the main bolt 5 will fall from the main bolt support frame 4, and even cause a safety accident. Low sex

Images