Box for making cavity for upright beam in concrete foundation is made from expanded metal with two opposite holes for transverse bar

摘要

The box, designed to form a lost shuttering component in a cast concrete foundation to make a cavity for an upright beam, is made from expanded metal or other material with holes in two opposite side walls for a transverse bar. The holes can be reinforced with inner washers, and the upper part of the box can be shaped to form a hopper, while its sides can have vertical feet for convenient positioning. The walls and base of the box can be single or double, and can be covered with a layer of film or screening material.