Jacking Method

Jacking method is a kind of storage tank installation method that refers to the bottom of storage tank as the reference plane, the wall in the top of the storage tank and the tank roof will be installed firstly, then assemble and weld the storage tank wall from top to the bottom of the storage tank until the installation of tank bottom is completed.

In recent years, through the practice of various projects, jacking method has groped for a more complete set of experience, compared with the traditional method, storage tank jacking method has greater advantages, whether from the safety, quality, duration, or economic benefits, and other aspects. Because of its easy to control, reliability, fewer hazards, jacking method has been used more and more for the storage tank construction.

Jacking method procedure guide for storage tank installation

Install the bottom of storage tank——hydraulic jack devices (equipments) for storage tank lifting are distributed on the circumference of the storage tank inner wall——through the upper clamping head and the lifting rod and the expansion ring to lift the tank body (including to roof of the tank) upward——oil return——the upper clamping head of the hydraulic jack is return along with the piston rod——the automatic clamping and lifting rod of the lower clamping head will not fall down—— jack repeats this movement——the lifting rod to drive up the tank body continuously until predetermined height is reached (the height for next layer of wall plate is vacated)——after the next layer of wall plate is butt welded——open the upper and lower loosen devices of the hydraulic jack——release the upper and lower clamping heads——down the lifting rod and expansion ring to the lower layer of wall plate——expand, tight, and weld the force transferring ribbed slab——weld——so repeatedly—— the tank has been set up to rise——final layer of wall plate welding is completed——complete the whole storage tank installation.

Layout for storage tank bottom annular plate welding with bow

Layout for storage tank bottom annular plate welding without bow

Large storage tank installation by the hydraulic jack for tank lifting has the following characteristics:

• Hydraulic lifting is smooth, safe and reliable. Due to the use of unified hydraulic control, and can be a single or local (several) adjustment, the whole process is relatively smooth. Because of their own structural characteristics of jacks, the self-locking performance is good, the storage tank or heavy objects will not fall or strain caused by power outages, hydraulic lifting process is safe and reliable.
• The quality of storage tank installation can be guaranteed. Because jack has adjustable (micro drop) function, lifting height can be more precisely controlled. Because of the above reasons, the welding quality of the storage tank body is guaranteed.
• The equipment is easy to operate, the installation environment is good, and the work efficiency is high.
• Strong adaptability of equipment. The complete set of equipment can be used in various of hydraulic lifting for large storage tank installation (or steel mast, communication tower, steel tower, etc.) with capacity ranging from thousands of cubic meters to tens of thousands of cubic meters, as long as increase or decrease the number of hydraulic hoist (i.e. loose clamping jack, the lifting frame, a lifting rod).
• According to the actual conditions, hydraulic pump station can be set in a reasonable position. For large storage tanks, the hydraulic pump station can be placed inside the tank, outside the tank or between the two tanks (when two tanks are installed by a pump station control system) to construct and control.
• Hydraulic pump station can be divided into two types: manual control and automatic control, its construction adaptability, technical performance and price ratio is very obvious.
• Short duration, low cost, good economic returns. Due to the high degree of modernization and high lifting speed of complete equipment, the construction cost is low and the economic benefit is good.

In short, the technology of jacking method has the advantages of convenient control, easy to operate, safe and reliable(not straining), accurate control of weld gap and the height of lifting rod, can assure the quality of project, also save labor, and reduce cost, the economic benefit is outstanding.