Reinforced Concrete Septic Tank Design

Concrete mix design concrete must have a minimum compressive strength of 4 000 psi at 28 days.

Reinforced concrete septic tank design.

Structural design of the septic tanks shall be by calculation or by performance. The tanks can be made of reinforced concrete or even of steel. Rice concrete limited produces both one and two section septic tanks ranging in size from 2840 litres 625 gallons to 4800 litres 1056 gallons in both standard and low profile design. It is rectangular in plan and length is 2 4 times of breadth.

Concrete thickness the concrete thickness must be sufficient to meet minimum reinforcement cover requirements and withstand design loading conditions. The design depends on the location of tanks i e. Some septic tank design has 2 chambers while others have 3. Procast products concrete septic tanks are constructed as required in california as a two compartmented vessel and meets the uniform plumbing code requirements in most counties.

Septic tanks are the first vital element of an onsite wastewater treatment system. These reinforced concrete septic tanks are manufactured in compliance with csa b66. 2009 parts i iv. The physical design requirements include.

Septic tank design it has one end connected to an inlet from the toilets and sometimes an outlet connected to the drain field. Generally two compartments are provided with a partition wall at a distance of 2 3 rd of the inlet. Septic tank should be watertight and constructed of bricks masonry stone masonry or sometimes concrete. Unlike steel or high density polyethylene septic tanks concrete septic tanks gradually strengthen with time and are able to withstand extreme load conditions with low susceptibility to damage during backfill.

Jensen precast has been making septic tanks since 1968. Capacity shape compartments influent and effluent pipes baffles and outlet devices and openings in top slab. A wall with openings between the floor and roof of the tank separates the chambers. The walls and floor of the tank are 10 cms 4 inches thick reinforced concrete providing sufficient strength to withstand water pressure and a reasonable amount of earth movement.

The reinforcing steel is a mesh of 8 mm diameter reinforcing bars spaced 15 cms 6 inches apart and built into a mesh box. Concrete strength reinforcing steel placement and openings shall also be considered in the design. The following design characteristics have a critical impact on the performance of on site wastewater tanks. The septic tank used in conjunction with one of the many treatment and dispersal options comprises a complete onsite wastewater.

The design of reinforced concrete water tank is based on is 3370.