Automatic tank top balance air jacking method and jacking device for LNG storage tank

Abstract

The invention discloses an automatic tank top balance air jacking method and a jacking device for an LNG storage tank. According to the method, a tank top is jacked to the top of the storage tank and is connected with a pressure bearing ring through air-blowing at the bottom of the storage tank. In the jacking process of the tank top, a steel wire rope transmission mechanism which does not need weights and is capable of automatically guiding and balancing the tank top is adopted, all sets of radial symmetrical points on the tank top can be located in a closed transmission loop and are restrained by one another, wherein the closed transmission loop is composed of a steel wire rope, a correspondingly-arranged pulley and a correspondingly-arranged pulley set. Thus, automatic balancing can be achieved, and the tank top can be simultaneously lifted and does not incline. The automatic tank top balance air jacking device is simple in structure and reasonable in design, and the balance weights do not need to be installed on the tank top; balancing and guiding of the storage tank in the air jacking process of the tank top can be achieved easily and conveniently, and stable and safe lifting of the tank top can be guaranteed.

Description

(1) Technical field: [0001] The invention relates to a vertical cylindrical LNG (abbreviation for liquefied natural gas) low-temperature storage tank roof installation and construction technology, in particular to an automatic balancing gas jacking method and a jacking device for the top of an LNG storage tank. (2) Background technology: [0002] At present, the roof installation of most atmospheric LNG cryogenic storage tanks generally adopts the combined installation of the tank roof and the suspended ceiling on the bottom of the storage tank, and then uses the gas jacking method to lift the tank roof to the concrete wall or tank wall. The set pressure ring is connected; in this method, a balance guide device is set. The structure of this device is that the upper end of the balance wire rope is fixed on the pressure ring, and it goes down around the tank roof through the T-shaped bracket on the pressure ring. The turning pulley installed on the top, then goes up through th...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of this device is: this device can only play the role of guiding and preventing the deflection of the tank roof, and the balance of the tank roof itself needs to be calculated by the balance weight. Install balance counterweight on top of the tank, so that the tank roof will not be tilted beyond the limit during the jacking process, so this kind of balance device cannot achieve automatic balance in the true sense

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