Manhole Boxes are four-sided boxes used to construct precast concrete manhole chambers, small chambers and small tanks. They require less time and labour to install compared to an hydraulic Manhole Brace and Trench Sheets.
This means that Manhole Boxes are a more efficient solution for some projects. Manhole Boxes are effective down to a depth of 7M, provided ground pressure does not exceed the permissible Safe Working Load (SWL).
Manhole Braces are a good alternative if SWL are expected to be exceeded and/or if cross services are an issue on-site.
If you are unsure about the depth or SWL, we recommend that you speak to us about our design service. CLICK HERE to find out more.