Patent ID: 6619885
Filing Date: 2003-09-16
Classification: E04G

Abstract:
A tunnel form comprising:two vertical forming walls joined by a horizontal forming wall, means for adjusting a height of a top edge of the tunnel form relative to a reference surface, means of support for the tunnel form to said reference surface, said means of support used to support the tunnel form when the tunnel form is stripped from poured concrete, and a prop, wherein said means for adjusting is connected to a base of said prop, said prop being slide mounted in a vertical sleeve attached to a base of said tunnel form; wherein said prop is placed in a first position when concrete is poured on the tunnel form, and placed in a second position when the tunnel form is stripped from the poured concrete, said base of said prop being lower than the means of support and lower than a base of the vertical forming walls when the prop is in the first position, and said base of said prop being higher than the means of support when the prop is in the second position.