Groundwater was leaking through the joints of these underground chambers at a wastewater treatment plant. Injecting polyurethane grout from inside the structure would provide an ideal fix to stop the groundwater from infiltrating. However, these chambers have various pipes and support structures that would make entry and performing the work nearly impossible. The solution was to still inject polyurethane grout, but from the outside. This method, often called soil grouting or curtain grouting, utilizes metal pipes driven down the outside of the structure to the problem areas. The pipes contain several holes that the grout can be expelled from when pumped. Groundwater will then carry the grout throughout the leak path, then react into a foam, thus stopping the inflow. The grout used was Hyperflex, manufactured by SealGuard, Inc. Hyperflex is a moisture activated, hydrophobic material that is NSF/ANSI/CAN 61 approved for contact with potable water. The grouting was performed by Sub-Technical, Inc.
Water was leaking out of this lake because it was flowing under the spillway instead of over it. Polyurethane grout injection was used to remedy the situation. Holes were drilled on the face deep enough to reach the backside of the spillway. Mechanical packers were then placed in the hole. The installed packers are now an injection port to hook up to the grout pump, which pumps the polyurethane to the back side of the spillway. The grout used was Hyperflex, a moisture activated polyurethane. Once in contact with the water, it foams to fill the voids and seal the leak paths. Hyperflex is NSF/ANSI/CAN 61 approved for contact with potable water and is manufactured by SealGuard, Inc. The grouting was performed by Sub-Technical, Inc.
This elevator shaft was leaking groundwater in between the floor and the first course of concrete filled block walls. Although this shaft has a drainage system, it needed to be dry to pass the final building inspection. To stop the unwanted inflow, polyurethane grout was injected to seal the leak paths. The grout used was Hyperflex and was injected by a pump and mechanical packers. Hyperflex is a single component, pre catalyzed, moisture activated polyurethane that is NSF/ANSI/CAN 61 approved for contact with potable water. Hyperflex is manufactured by SealGuard, and the grouting was performed by Sub-Technical, Inc.
A view of the tail seal brushes on a tunnel boring machine. In this situation, the tail seal brushes needed replaced and there was water flowing through seams in the tunnel segments. To control the heavy flow of water, polyurethane grout was injected around the leaks. The grout used was SealGuard II, which is manufactured by SealGuard, Inc. SealGuard II is a dual component, fast reacting material that can be easily applied with a dual component caulking gun. The grouting was performed by Sub-Technical, Inc.
When water is encountered during directional drilling, the most common method to try and stop it is pumping concrete. However, if there is a large volume of water, the concrete simply washes away and doesn’t seal the leak. Concrete also shrinks as it dries, so new leak paths are formed. In this instance concrete was tried and did not work, so polyurethane grout was injected 150 feet into the problem area. The grout used to stop the water flow was Hyperflex, a moisture activated hydrophobic polyurethane that is NSF/ANSI/CAN 61 approved for contact with potable water. Hyperflex is manufactured by SealGuard, Inc. and grouting was performed by Sub-Technical, Inc.
Posted by Chris on | Comments Off on Horizonal Drilling and Hyperflex Grout
To install a pipeline underneath an interstate, a horizontal directional drill was used. However, the drilling discovered that the area consisted of large voids / karst zones. The pipeline itself needs to have a solid foundation to rest on. To fill the voids, polyurethane grout was injected into the problem areas. The grout used was Hyperflex, manufactured by SealGuard, Inc. Hyperflex reacts with the moisture in the ground which creates an expanding foam to provide a solid base for the pipeline. Hyperflex is NSF/ANSI/CAN 61 for contact with potable water. The grouting was done by Sub-Technical, Inc.
Smaller water leaks in structures can be sealed by injecting single component polyurethane grout into the leak paths. The grout being used is Hyperflex, manufactured by SealGuard, Inc. Being a single component grout, Hyperflex is pre catalyzed and only needs 2% moisture to start reacting (foaming). The expanding foam will fill the voids that is creating the leak. Once cured, the foam will remain flexible to allow for slight movements within the structure. The benefit of a single component grout is the slower reaction and lower viscosity. This allows the material to travel further before the reaction, allowing for better penetration and coverage within the leaking substrate. Hyperflex is also NSF/ANSI/CAN 61 approved for contact with potable water. This injection was done using a grout pump and mechanical injection packers. Burlap was placed in a large void before injection to help prevent the grout from washout. Grouting was performed by Sub-Technical, Inc.
Posted by Chris on | Comments Off on Concrete Floor Seeping Water
This new construction concrete floor was leaking ground water at a joint. Polyurethane grout was pressure injected through mechanical packers to seal off the flow. The grout was Hyperflex, a single component moisture activated material that is manufactured by SealGuard, Inc. Hyperflex is pre-catalyzed and in NSF-61 approved for potable water. The grouting was done by grouting contractor Sub-Technical, Inc.
Posted by Chris on | Comments Off on Earthen Dam Repair
Earthen dams losing water can be injected with polyurethane grout to seal the leak paths. Here holes were drilled along the crest of the dam which enabled lances to be inserted. The lances were then hooked up to a pump and injected with Hyperflex. Hyperflex is a single component polyurethane grout that is moisture activated. Hyperflex is also NSF/ANSI/CAN 61 approved for contact with potable water. This method is less invasive and more cost effective than tradition repair methods. Grouting was performed by grouting contractor Sub-Technical, Inc.
Posted by Chris on | Comments Off on Creek Draining into Abandoned Mine Creating AMD
This dry creek bed was created by the water draining into an abandoned mine below. Not only was this creating a dried-up creek, but the water also leaving the mine at another location was creating acid mine drainage. To prevent the water from entering the mine, the creek bed was injected with polyurethane grout. The grout, Hyperflex, sealed off the leak paths and will help keep the water on the surface. Hyperflex is a single component, moisture activated material that is NSF/ANSI/CAN 61 approved for potable water. Hyperflex is manufactured by SealGuard, Inc. and was installed by grouting contractor Sub-Technical, Inc.
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