A Brief Discussion on The Construction Technology of Hydraulic Jacking Upside-down Method of Storage Tank

1. Project Overview

For example, a steel storage tank exceeding 10000m3 is a vaulted tank with a butt wall. In order to ensure the quality and safety of manufacturing and installation of storage tanks, combined with the construction experience of similar projects of our company, the storage tanks are constructed by hydraulic jacking and flip loading method.

2. Hydraulic Jacking Upside Down Principle

The hydraulic lifting jack (complete set of equipment) is arranged on the circumference of the inner wall of the storage tank, and the top of the tank and the upper layer (the first layer and the top of the tank) are lifted first, and then the wall panels of the tank are welded layer by layer. The lifting jacks (hydraulic jacking system) composed of self-locking hydraulic jack and lifting frame and lifting rod is adopted through the hydraulic control system, so that when the hydraulic jack is fed, the upper clamping head is clamped and the lifting rod and expansion ring are lifted, thus driving the tank body (including the top of the tank) to lift upward, when the jack returns the oil, the upper clamping head returns with the piston rod, and the lower clamping head automatically clamps the lifting rod Will slide. This repeated movement of the jack causes the lifting rod to rise continuously with the tank until it reaches a predetermined height (the height of the next layer of board). After welding the butt assembly of the next layer of panel, open the upper and lower clamping devices of the hydraulic jack, loosen the upper and lower clamping heads, and lower the lifting rod and expansion ring to the lower wall of the next layer of panel, weld the force transfer reinforcement plate, and then lift. So repeated, so that the welded tank has been raised until the last layer of wall panel welding is completed, to meet the requirements of the flip method construction process.

3. Construction Process Flow

Reinspection of tank foundation One tank bottom middle plate laying → one tank bottom bow edge plate laying a top two ring panel assembly a package of edge Angle steel assembly vault assembly → lower ring panel a hydraulic lifting top ring panel a middle ring panel, group a bottom ring panel assembly (sealing large ring) tank water filling test → Finished

4. Key Points of Construction Operation

Floor laying, welding and assembly; Panel assembly; Storage tank vault installation; Lifting system

5. Quality Safety Control

The tank geometry is checked according to the current relevant standards, and the weld is inspected for appearance and non-destructive. The quality control points are as follows: Tank bottom weld inspection; Tank bottom tightness test; The first layer of wall panel group inspection; Weld appearance and geometry inspection; Weld non-destructive testing and tightness test; Tank master test.

Safety control points: on-site construction electrical grounding inspection, lifting device stability inspection, reinforcement plate welding quality inspection, tank water filling test procedures inspection.

6. Closing Remarks

The construction of large storage tanks not only reflects the technical strength level of the construction unit, but also reflects the overall coordination level of the construction unit. The hydraulic jacking upflip method is currently an ideal new method for the manufacturing and installation of storage tanks, which is suitable for the manufacturing and installation of storage tanks above 1000m3, especially for 10000m3 The manufacture and installation of the above arch roof tank, internal floating roof tank and floating roof tank have the incomparable advantages of other construction methods, have broad development prospects, and are worth popularizing and applying. Through the feasibility analysis of the construction safety and construction efficiency, quality, schedule and cost of large-scale storage tank inversion method, the construction technology of large-scale storage tank inversion method has advantages in the construction efficiency, safety and construction quality, etc. The development of large-scale storage tank inversion method construction technology can speed up the construction of large-scale storage tank in our country, reduce costs, and can be popularized and applied in similar projects.