To install an outer sewage system, first of all, you need to prepare a trench under its bookmark. To do this, the trench is born using special equipment or manually.
The usual trench, where the outer sewage system will be laid, should be about thirty centimeters and a meter deep.
It is worth knowing that cast -iron sewage is installed a little deeper – somewhere about twenty meters and should be forty centimeters in width.
For this type of sewage, a foundation is prepared on which such a design can firmly lie and have a certain level, that is, a small slope to sewer drain.
To do this, the cord is pulled from the beginning of the outer network to the septic tank and the support is installed along the cord, on which the sewage system will be placed. The support is made of wood, treated with mastic or resin, as well as bricks.
Filling the trench
In order to avoid damage to the laid pipeline, you should also carefully ensure that there is no stones and other solid inclusions in the soil used to fall asleep the trench. In cases where the soil that is taken when digging a trench is not suitable for filling, you can apply ordinary sand for this purpose. Large elements in the soil that is used to fall asleep of the pit should be no more than thirty centimeters in its diameter.
Book with uniform layers, where the first layer is poured approximately twenty centimeters along the entire width from the top of the pipe. Then the layers should be poured up to ten centimeters thick, when the soil is sandy and five centimeters with clay soil.
