Hello, everyone!
Today, I want to continue to explain a new topic – ODN engineering and maintenance. Now, I will start to explain ODN engineering. Today, the topic is the civil work of ducts. Let’s get started.
ODN network can be realized by above ground, underground in pipes, direct burial and underwater. ODN is mainly realized underground in PVC pipes and above ground. Frequent combinations are above ground in PVC pipes and above ground on poles.
The first step is to design the network, after obtaining the appropriate building permits and approvals, construction work can begin. This is now the first step in securing the construction site. The safe work of all workers and at the same time the safety of all people in the vicinity of the construction site is needed. Route checking and marking are performed. Appropriate radars are used to detect underground facilities. The greatest danger is damage to gas pipelines or high voltage cables.
Trench digging is done in the case of PVC pipe installation and direct burying of optical cables. The dimensions of the trench also depend on that.
Classic trenches for the installation of PVC pipes should have a depth of 0.8 to 1.2 m. At that depth, the cables are safe. In the case of groundwater, a smaller trench depth is allowed. But there are also extreme situations, such as hard rocky ground, where less depth is allowed (minimum is 0.3 m), but at the same time, additional protection with concrete slabs is required (it shall have a strength of 20 MPa). The width of the trench depends on the number of PVC pipes to be installed. It is about 300 mm.
Micro cables run in HDPE micro ducts, in micro trenches. Micro trenches have a much smaller depth, about 300 – 500 mm, and wide is from 20 to 60 mm.
Digging is special for manholes and handholes. Special precast concrete elements are also used here. But that is a special topic for the second article.
This is the end of this article. I will continue to explain this topic in the next article >> ODN Engineering and Maintenance (11).
Thank you!
