Views: 0 Author: Site Editor Publish Time: 2024-08-29 Origin: Site
At present, there are six kinds of construction methods for large storage tanks in China: hydraulic lifting inversion, center column inversion, inflatable lifting inversion, water floating inversion, upright installation and mechanical lifting inversion. The six construction methods are compared from the aspects of construction quality, safety, progress and economic benefits as follows:
Hydraulic lifting inversion method is between several construction methods, its characteristics are a wide range of adaptation, theoretically can be applied to any size of the storage tank, the second is the operation control is simple, reliable, small risk, so it has been more and more used, its main disadvantage is the current complete set of equipment is more expensive, equipment purchase one-time investment is large.
1) Assembly and welding of tank bottom plate;
2) Set up and weld the first layer wall plate and vault roof of the tank;
3) Expansion ring and hydraulic lifting device installation;
4) Overall hydraulic lifting and installation of each layer of siding;
5) Install tank accessories, pipelines, etc.;
6) Tank test;
7) Anti-corrosion, heat preservation.
Install several fixed cushion piers (400mm high, spacing 3-4 meters) on the bottom of the tank under construction, then assemble the first layer of wall panels and top cover, and deploy several hydraulic lifts (determined according to calculation) along the inner wall of the tank 400mm. The sliding bracket of the hoist supports the lower part of the expansion ring fixed on the inner wall of the tank to operate the control cabinet of the hydraulic hoist. Centralized control of the action of the hydraulic press, hydraulic hoist lifting rod, but also lift the tank, to the height of the next area of the wall panel, can be assembled, and then drop the rod, expansion ring, and then the next area of the lifting assembly, until the entire tank upside down.
1) Prefabrication of tank bottom plate: cut the material according to the design drawing number, and stack it according to the number.
Tank panel prefabrication: panel cutting, round, in order to ensure the quality of panel prefabrication, panel cutting using semi-automatic cutting machine.
2) Prefabrication of the top plate: Before prefabrication of the fixed top plate, the layout of the top cover plate should be drawn according to the size specifications, design drawings and standard specifications of the supply plate. A single top cover plate should be buttoned and assembled according to the large drawing to ensure that the minimum spacing of any adjacent weld should not be less than 200mm.
3) Tank installation: foundation acceptance, oil tank installation must be in accordance with the civil foundation design documents and specifications of the surface size of the inspection, before the installation can be qualified.
4) Panel installation: Before the panel installation, the panel installation circumference should be drawn on the bottom plate, and several 400 × 300 mm steel cushion piers (the spacing is about 3-4 meters) should be evenly arranged on the painted line circumference. The steel cushion pier and the bottom plate should be spot-welded, and the panel assembly circumference should be led to the steel cushion pier. And the 50 mm high stop block on the steel cushion pier and the 450 mm Angle iron stop block on the bottom plate are spot-welded to facilitate the round finding of the wall panel installation.
5) Plate mounting top cover: The plate mounting top cover shall be carried out in strict accordance with the approved top cover row drawing, and the top cover plate shall be enlarged 15mm along the arc direction of the top cover plate.
The number of hydraulic jacks is generally determined by pressing:
n = Pmax/Q
Pmax=K(PG+P attached)
n---- The number of hydraulic lifts required;
Pmax - maximum lifting weight;
PG---- Maximum lifting weight of the equipment body;
P attached -- the maximum lifting weight of equipment accessories;
Q = 160kN SQD-160-100S Carrying capacity
K = 1.3 (safety factor)
