STAY-IN-PLACE FORM FOR ERECTION OF WALLS IN SOIL Russian patent published in 2013 - IPC E02D5/20 

FIELD: construction.

SUBSTANCE: stay-in-place form for erection of walls in soil in a prepared trench. Comprises a pile used as a pipeline for supply of concrete mix into the pile base for fixation of the pile on the bottom of the trench, made of a pipe, along which symmetrically relative to the longitudinal axis of the pipe at the outer side there are two rectangular blocks of stay-in-place form fixed, made of elastically deformable material, for instance, thin-sheet steel, glass plastic, coal plastic. The height of form blocks is equal to height of or is slightly higher than the erected wall, the distance between vertical walls is determined by trench width, between each other the vertical walls are additionally connected by flexible joints, which are distributed with a certain pitch along the entire surface of the form, so that when a filler fills under certain pressure compartments of form joints, the size of the form in cross direction increases, and side walls of the form provide active pressure at trench walls, providing for resistance of not only the trench walls, but also soil base and foundation of existing buildings and structures located in close proximity. Along height forms are separated into several separate compartments with flexible partitions.

EFFECT: increased reliability of both a structure and a soil base, in which a wall is erected, increased stability of foundations and bases of buildings and structures located in close proximity.