Patent DE-19944629-C1 (DE)
Title: Vertical outer sealing barrier at a building wall is formed by a sealing gap between it and a lost shell to be filled with a mixture of loose material and a gel which sets into a gelled mass
Inventor: RINDFLEISCH HANS-JOCHEN
IPC: E02D31/06
Filed: 1999-09-17
Granted: 2001-05-17
Abstract: To erect a vertical and external protective barrier, at a building or other construction, a horizontal barrier layer is laid in an external trench to a level below the foundation using loose material together with a bonding agent by soaking or mixing before or after it is laid. Before the layer has set, a lost mold shell is installed so that the sealing gap between the outer side of the wall and the shell is sealed to the ground level. The gap is filled with a mixture of gel and water which penetrates wholly into the pores of the wall structure and the loose filling material when placed under hydrostatic pressure. After a short reaction time, it hardens into a solid and gelled mass to form a sealing layer against any water pressure.  At a foundation (3) with a footing (3'), the loose material layer is laid on the footing (3') so that the fillet (8) formed between the wall (1) and the foundation (3) remains free to the sealing gap (11). The mixture of gel and water is fed into the gap to penetrate into the fillet (8). The mixture (9) of loose material and gel is composed of quartz sand impregnated with gel/water with a water-active single component in a ratio to water of 1:3 to 1:5, which sets into a solid gelled mass after a short reaction time. Where there is no footing (3'), the loose material is a concrete mass, applied under the horizontal barrier (13) at the outer side (2) of the wall (1), to form a concrete plinth. The lost shell (10) is fitted in place before the concrete hardens. Where there is already a solid concrete plinth present, the mixture (9) of loose material and gel is laid on the plinth, so that the horizontal water course (13) and the gap between the plinth and the outer side (2) of the wall (1) remain free, to take the mixture (9) of loose material/gel, which can penetrate into all the gaps. The gap (11) between the outer side (2) of the wall and the lost shell (10) is filled with a water-active prepolymer and water with a prepolymer:water ratio of 1:8 to 1:10. After gelling, it forms a solid sealing layer (12). If the outer side of the wall (1) is fissured, two gaps are formed by two lost shells. In the gap against the wall, a compensating layer is formed by the loose material/gel mixture (9) at the level of the horizontal water course (13) and an upper concrete mass. The water/gel mixture is laid in the second gap. The lost shell (10) is a burred web and/or board, with spacers. The boards pref. have thermal insulation properties. With slitted and free-laid wall outer surfaces (2), the lost shell (10) is positioned loosely from it by the gap (11) width, and the soil zone at the earth slit (6) between the shell (10) and the ground is filled with a base material (5'), and the water/gel mixture is delivered by pouring, injection or a spray. Where the outer side (2) of the wall (1) is accessible, the shell (10) is positioned after the loose material is in place, spaced by the width of the sealing gap (11), for a base layer (5') to be laid on the ground (5), and the gel/water mixture to be fed in by pouring, injection or as a spray into the sealing gap (11). Where there is a defective vertical barrier at the wall, a new barrier is developed in front of it at a laid protective or insulation board. Where the barrier formed by two gaps, with two shells, the first gap against the wall surface contains the loose material/gel mixture (9) at the level of the horizontal water course (13) and the upper zone has a layer which is permeable to vapor, or is fitted with vapor guide openings. The gel/water mixture fills the second gap.