In-situ barrier device with internal injection conduit

Method for establishing a continuous grout wall curtain against a concrete structure, comprising:

• providing at least two multi-layer fluid delivery assemblies, each assembly having substantially coextensive first and second layers defining intermediate open-matrix layers for an injection fluid;
• the first layers having an inwardly facing surface and an outwardly facing surface, the first layers being permeable to the injection fluid but at least nearly impermeable to a structural construction material to be applied against the outwardly facing surface of the first layer, and the second layers being water-impermeable and having an inwardly facing first side and an outwardly facing second side, the inwardly facing first side of the second layers being affixed directly or indirectly to the inwardly facing surface of the first layers such that all or a substantial portion of the second layers is spaced apart from the first layers to create air space between the first layers and the second layers;
• and each of the multi-layer assemblies comprising at least one injection conduit member disposed in parallel orientation with respect to the first layers and second layers and extending at least a full width or length of the substantially co-extensive first and second layers, the at least one injection conduit members having openings for introducing an injection fluid between the first and second layers and into the intermediate open-matrix layer air spaces, the at least one injection conduits being in communication with each other to enable an injected fluid to flow between the adjacent multi-layer assemblies to form the continuous grout wall curtain within the open-matrix layers between the second layers and combinations of the first layers and hardened structural construction material, each of the at least one injection conduits comprising at least one spiral wrap member tubing for conveying the injection fluid;
• applying concrete against the at least two multi-layer fluid delivery assemblies;
• and
• forming a continuous grout wall between the substantially co-extensive first and second layers and against the concrete applied against the fluid-delivery assemblies by introducing an injection fluid into the at least two multi-layer fluid delivery assemblies through the injection conduits which are in communication.

A device for post-installation in-situ barrier creation, comprising:

• a multi-layer fluid delivery device comprising substantially coextensive first and second layers defining an intermediate open-matrix layer for an injection fluid;
• the first layer having an inwardly facing surface and an outwardly facing surface, the first layer being permeable to the injection fluid but at least nearly impermeable to a structural construction material to be applied against the outwardly facing surface of the first layer, and the second layer being water-impermeable and having an inwardly facing first side and an outwardly facing second side, the inwardly facing first side of the second layer being affixed, directly or indirectly to the inwardly facing surface of the first layer such that all or a substantial portion of the second layer is spaced apart from the first layer, using an open-matrix structure to create air space between the first layer and the second layer and thereby defining the open-matrix layer for conducting an injection fluid between said first and second layers to form a continuous grout wall within the open-matrix layer between the second layer and a combination of the first layer and hardened structural construction material;
• and
• a gel activator located within the space defined by the open-matrix structure.