Form for making a permanent concrete mine stopping

A form for making a permanent mine stopping of pourable and hardenable material such as concrete, said form comprising

• two sets of elongate extensible panels, each set including a plurality of said panels adapted to be erected to extend vertically in side-by-side relation from the floor to the roof of a passageway in a mine, the two sets of panels being adapted to be erected with the panels of one set constituting a first generally vertical wall of the form and the panels of other set constituting a second generally vertical wall of the form generally parallel to and spaced from the first wall to define a space to be filled with said pourable and hardenable material to form said stopping,
• each panel comprising a first elongate sheet metal member constituting a lower member of the panel adapted for engagement of its lower end with the floor of the passageway, and a second elongate sheet metal member constituting an upper member of the panel adapted for engagement of its upper end with the roof of the passageway, said members having a telescoping sliding fit with one another to permit adjustable extension of the panel to fit the height of the passageway, and
• means for holding the walls in spaced, generally parallel relation prior to, during and immediately after filling of the space between the walls with said pourable and hardenable material.