Abstract: The present invention relates to improvements in U-shaped tunnel shutterings or framing for poured concrete constituted by two half shells in the form of a right-angled dihedron, of which the edges of upper horizontal panels are connected by clamping locks and each of said edges is connected to the bottom of a vertical panel by braces of adjustable length, the reduction in length of the braces determining a reduction in the angle of the dihedron; said shutterings may be used either in the form of a complete "U" with the two half-shells connected, in which case lower parts of the two vertical panels are connected by removable horizontal bars of adjustable length, or as half-shells in which case props are used which are articulated on the free edge of the horizontal panel and rest on the ground.

Abstract: A removable cast, form or "shuttering" is provided to form "in situ" from poured concrete the portion of an outside wall, of a building disposed between the sill of the window opening of one story and the upper part of the window opening of the story directly below it. The shuttering comprises a unitary combination handleable in a single operation of either assembly preparatory to pouring concrete, or disassembly after pouring. It includes all adjustment means necessary for adjusting the assembly in all directions, and does not require any alteration to the parts of the building already constructed. The shuttering, when assembled, is characterized by having its center of gravity disposed within the building, to provide a more stable equilibrium during pouring, and by having its center of gravity, upon disassembly, displaced to the outside of the building, to facilitate its ready removal with the aid of a crane, winch or other comparable lifting means.