CN101982390A

CN101982390A - Hoisting method of outer cover of main transformer

Info

Publication number: CN101982390A
Application number: CN2010105161270A
Authority: CN
Inventors: 周建军; 王修庞; 秦卫东; 孙更
Original assignee: Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Current assignee: Nanyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority date: 2010-10-22
Filing date: 2010-10-22
Publication date: 2011-03-02
Anticipated expiration: 2030-10-22
Also published as: CN101982390B

Abstract

The invention discloses a hoisting method of an outer cover of a main transformer, which comprises the following steps: (1) preparing before hoisting; (2) trying to hoist: hoisting is slowly started to guarantee that all hoisting ropes are stressed; a round steel temporary positioning bar passes through four-corner bolt holes of the main transformer from top to bottom, and four sway ropes are tied on the top; the center-of-gravity shift condition of the main transformer is checked; a hoisting hole on a hoisting tool is adjusted according to the hoisting center-of-gravity shift condition; the optimum balance point of the hoisting cover is found; and the balance while hoisting the outer cover of the main transformer is guaranteed by utilizing a lever principle; (3) hoisting; and (4) hoisting back. In the hoisting course, the outer cover of the main transformer is vertically hoisted so as to accurately grasp the center of gravity, thus preventing from tilting and avoiding crash or damage in the courses of hoisting and reassembling, ensuring better safety performance of the whole cover-hoisting operation and improving operating efficiency and quality.

Description

A kind of hanging method of main transformer outer cover

Technical field

The invention belongs to substation service technique field, be specifically related to a kind of hanging method of main transformer outer cover.

Background technology

The maintenance of main transformer is the work of a complexity, and its work capacity is big, and the repair time is long, and the directly reliability of influence power supply for a long time has a power failure.The tradition hoisting method is to remove annexes such as radiator, sleeve pipe before main transformer hangs cover, goes back to the dress back at the main transformer outer cover annexes such as radiator, sleeve pipe are installed, and the task amount that main transformer hangs cover work is huge.4 lifting methods are all adopted in the lifting of main transformer outer cover.Specific practice is to utilize crane as lifting appliance, utilizes wire sling, suspension ring etc. to lift by crane as the outer cover of suspender to main transformer.Before the lifting of main transformer outer cover, crane is parked in place, find the center-of-gravity position of main transformer outer cover accurately, make suspension hook aim at the center-of-gravity position of outer cover.Then the two ends of two wire slings are hung in the stress point place of main transformer outer cover, two wire slings are hung on the hoist lifting hook, check that safe and reliable back carries out 4 liftings to the main transformer outer cover, the button cover is undertaken by hanging the cover reverse order.The method of this traditional main transformer outer cover lifting is also run into core and coil easily when annexes such as dismounting radiator, sleeve pipe, increase the difficulty of lifting, and whole crane lifting service amount is big, and troublesome poeration is finished whole work and needed three days, and operating efficiency is low.The problem that the integral hoisting of main transformer outer cover exists: because the difference of size, shape and the present position of annex on the main transformer outer cover makes main transformer centre-of gravity shift, the run-off the straight of lifting rope unbalance stress outer cover lifting process.So can't realize integral lifting with conventional hanging method.

Summary of the invention

Be to solve the above-mentioned defective that prior art exists, the object of the present invention is to provide a kind of lifting convenient, guaranteed whole the safe and reliable of cover work that hang, improved the hanging method of the main transformer outer cover of the efficient of work and quality again.

For achieving the above object, the technical solution used in the present invention is: the hanging method of this main transformer outer cover, it is characterized in that operating as follows: 1, prepare before the lifting: the tie bolt of dismounting outer cover, hoist lifting hook is connected by any two lifting eyes of lifting rope and suspender, is connected the main transformer outer cover on the weight connecting bore of suspender by lifting rope again; 2, examination is hung: slowly lifting makes each lifting rope stressed, in four corner bolt holes of main transformer, wear the interim locating bar of round steel from top to bottom, and fasten four rollings at the top and restrict, check the centre-of gravity shift situation of main transformer, drift condition according to the center of gravity of slinging, adjust the lifting eye on the suspender, find the optimal balance point that hangs cover, utilize lever principle to guarantee the balance of lifting main transformer outer cover; 3, lifting: hoisting crane slowly hangs the main transformer outer cover get off; 4, return and hang: the maintenance back winches to the main transformer position with the examination of step 2 method of the hanging main transformer outer cover of steadily slinging with the main transformer outer cover, removes interim locating bar, locks tie bolt.

For improving main transformer different each lifting rope unbalance stress phenomenon that makes of effective length in the lifting process, can on the short lifting rope of effective length, install U type ring additional in described the 2nd step, make the effective length of each lifting rope isometric owing to lifting rope.

Adopt the beneficial effect of technique scheme: the hanging method of this main transformer outer cover, adopted suspender with five lifting eyes, this suspender also is provided with two weight connecting bores, hoist lifting hook is connected by any two lifting eyes of lifting rope and suspender, be connected the main transformer outer cover on the weight connecting bore of suspender by lifting rope again, when examination is hung, grasp bad for preventing center of gravity, the staff is behind the 50mm that slings, time-out has also been checked lifting center of gravity and center, and some tilts to find outer cover, adjusts the lifting eye on the suspender, find the optimal balance point that hangs cover, utilize lever principle to guarantee the balance of lifting main transformer outer cover.But owing to the reason that a lot of annexes are arranged on the main transformer outer cover, make different each lifting rope unbalance stress that makes of effective length of wire sling, also has the slight inclination phenomenon during outer cover lifting, can on the short lifting rope of effective length, install U type ring additional, make the effective length of each lifting rope isometric, the balance of main transformer outer cover center of gravity after having guaranteed to sling.This hoisting method needn't be removed main transformer part annex when hanging cover, can be with annex to carry out main transformer and hang cover work, the main transformer outer cover will vertically be sling in the lifting process, grasped center of gravity very accurately, prevented inclination, that outer cover can remain is steady, straight, maintain a certain distance with high and low pressure side lead-in wire, shunting switch support, lifting reaches back and does not bump in the process of assembling and damage, both guaranteed that the whole safety performance that hangs cover work was better, improved the efficient and the quality of work again.

Description of drawings

Below in conjunction with accompanying drawing specific embodiments of the invention are described in further detail

The double-hung balance sling that Fig. 1 adopts for the inventive method.

The specific embodiment

As Fig. 1 is double-hung balance sling of the present invention, this a kind of double-hung balance sling, comprise suspender body 1, described suspender body is connected with lifting rope by two suspension hooks 2, the two ends of suspender body are provided with two weight hooks 4, between two weight hooks a plurality of suspension hook knock holees 3 are being set on the suspender body, any two the suspension hook knock holees in described a plurality of suspension hook knock holees flexibly connect with two suspension hooks respectively.

Using this double-hung balance sling needn't remove the part annex just can integral lifting main transformer outer cover, concrete hanging method is operated as follows: 1, prepare before the lifting: the tie bolt of dismounting outer cover, hoist lifting hook is connected by any two lifting eyes of lifting rope and suspender, is connected the main transformer outer cover on the weight connecting bore of suspender by lifting rope again; 2, examination is hung: slowly lifting makes each lifting rope stressed, in four corner bolt holes of main transformer, wear the interim locating bar of round steel from top to bottom, and fasten four rollings at the top and restrict, check the centre-of gravity shift situation of main transformer, drift condition according to the center of gravity of slinging, adjust the lifting eye on the suspender, find the optimal balance point that hangs cover, utilize lever principle to guarantee the balance of lifting main transformer outer cover; If different each lifting rope unbalance stress phenomenon that makes of effective length of lifting rope can install U type ring additional on the short lifting rope of effective length, make the effective length of each lifting rope isometric; 3, lifting: hoisting crane slowly hangs the main transformer outer cover get off; 4, return and hang: the maintenance back winches to the main transformer position with the examination of step 2 method of the hanging main transformer outer cover of steadily slinging with the main transformer outer cover, removes interim locating bar, locks tie bolt.The main transformer outer cover will vertically be sling in the lifting process, grasped center of gravity very accurately, prevented inclination, outer cover can maintain a certain distance with high and low pressure side lead-in wire, shunting switch support all the time, lifting reaches back and does not bump in the process of assembling and damage, both guaranteed that the whole safety performance that hangs cover work was better, improved the efficient and the quality of work again.

Claims

1. the hanging method of a main transformer outer cover is characterized in that operating as follows:

(1) prepare before the lifting: the tie bolt of dismounting outer cover, hoist lifting hook is connected by any two lifting eyes of lifting rope and suspender, is connected the main transformer outer cover on the weight connecting bore of suspender by lifting rope again;

(2) examination is hung: slowly lifting makes each lifting rope stressed, in four corner bolt holes of main transformer, wear the interim locating bar of round steel from top to bottom, and fasten four rollings at the top and restrict, check the centre-of gravity shift situation of main transformer, drift condition according to the center of gravity of slinging, adjust the lifting eye on the suspender, find the optimal balance point that hangs cover, utilize lever principle to guarantee the balance of lifting main transformer outer cover;

(3) lifting: hoisting crane slowly hangs the main transformer outer cover get off;

(4) return and hang: the maintenance back winches to the main transformer position with the examination of step 2 method of the hanging main transformer outer cover of steadily slinging with the main transformer outer cover, removes interim locating bar, locks tie bolt.

2. the hanging method of main transformer outer cover according to claim 1, it is characterized in that: be to improve main transformer different each lifting rope unbalance stress phenomenon that makes of effective length in the lifting process in described the 2nd step owing to lifting rope, can on the short lifting rope of effective length, install U type ring additional, make the effective length of each lifting rope isometric.