The file shows the Autocad 2D DWG drawing file of the cable trench inside. Lean concrete is provide and it is a mix where the amout of cement is lower than the amout of liquid present in the strate. This make it ideal as base layer where other kinds of concrete are placed on top. Steel plated is used to strenghten foundation. Expansion bolts are used to secure the heavy object like wall, floor. Thanks for downloading the 2D Autocad file and other CAD files from our website.