The embedding of hot-dip galvanized drains and steel discharge pipes in concrete has been standard practice for years. If the concrete is prepared in a manner compatible with the galvanization, based on previous experience, an external coating can be omitted.

If additives such as frost protection, retarders, or accelerators are used in the concrete, the pipe should be coated externally either at the factory or on-site, or receive a protective coating with standard construction protection on-site. These additives are mainly mixed in during the colder winter months.

Upon request, LORO can apply the external coating to the contact surfaces with concrete on the drains at the factory. However, since this must be done manually, a surcharge must be calculated.

Formwork Bell

A formwork bell can be used when embedding drains or pipes in concrete, especially for balconies, to visually conceal the lower push-fit socket connection in the concrete slab. The formwork bell is placed on the pipe during the concreting process and then removed afterward.

This creates an annular gap around the pipe in the concrete slab at the position of the formwork bell, which is large enough to accommodate the socket of the pipe below.

For special drains with a bell, a separate formwork bell is not necessary.

Key points

1. Embedding galvanized drains and pipes in concrete is standard practice.
2. External coating may be necessary if concrete additives are used.
3. LORO can apply external coating at the factory upon request.
4. Formwork bells are used to conceal socket connections in concrete slabs.
5. Some special drains come with integrated bells, eliminating the need for separate formwork bells.