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CONSTRUCTION PHASES

CONSTRUCTION OF THE BASE

Tankext only recommends the procedure based on its experience and is not responsible for the calculations, technical supervision, material execution, or quality control of the civil works.

SITE SELECTION

The location of the tank must be carefully selected, considering the following points:

a) The position of the tank in relation to existing buildings and future expansions.
b) A minimum distance of 1 meter must be maintained from the outer perimeter of the tank for assembly and maintenance.
c) The tank must be placed at a distance of approximately twice the height of existing trees.
d) Before starting any work, the client must conduct a geotechnical study of the land where the tank will be installed to verify its resistance.

  • This study must be carried out by a specialized company, and a written report is required.

  • If the ground resistance is lower than specified in our standard base general plan, this plan should not be used for foundation construction, and it is necessary to contact our technical department.
    e) The choice of the installation site is not the responsibility of the assembly team.

  • The exact position of the tank’s center and the leveling of the base must be completed and marked before its arrival.

If there are any doubts, contact our technical department before starting work.

EXCAVATION INSTRUCTIONS

To build a high-quality base and avoid differential settlements, the concrete must be evenly settled over the entire bottom of the excavation.

a) Place a stake at the center of the tank.
b) From the central stake, mark the perimeter of the foundation according to the plans, using sand or sawdust.
c) Excavate the trench for the foundation to a depth of approximately 600 mm and a width of 800 mm.
d) Excavate the entire interior area to a depth of approximately 350 mm, removing all organic material.
e) Level the bottom of the foundation and the interior area with well-compacted gravel, with a thickness of approximately 100 mm, forming a flat and firm base on which the foundation concrete and the final fill can be placed.

CONCRETE BASE

The concrete base is built in two phases:

Foundation – 1st Phase:

  • This involves creating a reinforced concrete base in the form of a perimeter ring, 800 mm wide and 400 mm deep.

  • It must be perfectly leveled around its entire perimeter, with a maximum allowable unevenness of 10 mm.

  • The concrete quality must be 250 kg of cement per cubic meter of concrete, vibrated and finely finished across its entire surface.

  • The ring must be reinforced to prevent cracking, with a support mesh made of 12 mm corrugated round bars spaced 150 mm apart and tied to other transverse bars every 500 mm.

  • The entire base must be built on solid ground with a minimum resistance of 1.5 kg/cm², properly prepared to receive the concrete.

  • The interior of the ring should be filled with lean concrete, but always level with the base.

It is very important to take special care in the construction of this first base, as the correct assembly and leveling of the tank depend on it.

Request detailed plans from our Technical Department.

Foundation – 2nd Phase:

Once the entire tank is completed, the interior base and the exterior perimeter curb are built, both made of reinforced and waterproof concrete, with 350 kg of cement per cubic meter of concrete, vibrated and finely finished.

  • This operation must be carried out in a single day to avoid cracks or poorly made joints that could result in water leaks through the concrete.

Interior Base:

  • A 200 mm thick slab, reinforced with a double mesh of 8 mm in a 150 x 150 mm grid.

  • The first mesh should be 30 mm above the ground, leaving 140 mm between the two meshes, and 30 mm from the second mesh to the upper surface of the slab.

  • This reinforcement will be stacked inside the tank before it is permanently closed and will be distributed in its final position once the tank is closed.

Exterior Perimeter Curb:

  • Dimensions of 300 x 300 mm.

  • Reinforced with 12 mm corrugated round bars in vertical position every 500 mm, in two rows, tied to other 12 mm horizontal corrugated round bars arranged perimetrically in two and three rows.

  • This reinforcement will be installed once the tank is completed, and the fixation will be done using drills and epoxy resins.

Request detailed plans from our Technical Department.

For membrane tanks, only a support base is required (1st Construction Phase).