Pressure Grouting

Schnabel stands out as a premier design-build contractor in the U.S., renowned for its advanced pressure and jet grouting techniques. These methods are crucial in tackling complex operational challenges and fulfilling construction objectives.

Pressure grouting, similar to jet grouting, is vital in mitigating underground water intrusion in subterranean structures. It’s also employed for reinforcing existing foundations and providing support during excavations.

As a top-tier contractor in America for both pressure and jet grouting, Schnabel excels in forming cement-stabilized soil crucial for controlling groundwater and bolstering foundations.

Leveraging years of industry experience, Schnabel possesses the proficiency to navigate through the intricacies of your construction site, ensuring you meet your project goals. Contact us today to get started!


Jet grouting, a specialized form of pressure grouting, involves the in-situ blending of soil with a cement grout to form a robust soil column. This process enhances the soil’s strength and reduces permeability, making it an engineered solution for foundation support and groundwater management. It’s particularly useful for underpinning existing structures and creating cutoff walls for excavation support.

The technique involves drilling a narrow pipe (about 4 inches in diameter) to the required depth, followed by injecting cement grout at high pressure (around 6,000 psi). This action, combined with the rotation and retraction of the pipe, forms a circular column of fortified soil. By adjusting the withdrawal speed, the diameter of these columns can be tailored. Strategically placed, these columns offer vertical support or combine to form a barrier against soil and water movement.

The effectiveness of jet grouting, a subset of pressure grouting, is heightened in areas with underground utilities or obstructions. The slender drilling pipe can navigate these spaces, allowing for the creation of wider soil columns beneath, an advantage not offered by traditional methods. This flexibility makes jet grouting a preferred choice for complex subsurface conditions.


Children’s Hospital in Minneapolis

Schnabel used jet grout columns as underpinning and excavation support for the construction of an addition to the Children’s Hospital in Minneapolis, Minnesota. The jet grout columns eliminated the need for timber lagging and prevented the loss of sand during the 21-foot-deep excavation.

J Avenue Water Treatment Plant

Schnabel installed 67 jet grout columns to support the expansion of the J Avenue water treatment plant in Cedar Rapids, Iowa. This project required an excavation adjacent to an existing structure. The continuous wall of jet grout columns was successful in retaining the soil and water behind the wall and no measurable settlement of the tank structure occurred.

The Minneapolis Children’s Hospital project was Schnabel’s first application of jet grouting to underpin an existing structure in lieu of traditional hand-dug underpinning pits. The project team was very pleased with the performance of the jet grout underpinning system.

Chuck Conlon, P.E., Children's Hospital of Minneapolis


Schnabel is the sector’s most operationally efficient Geostructural Design & Construction contractor. We optimize efficiencies by leveraging decades of experience and design/build expertise to innovate processes and approaches that are consistently proven to deliver optimal outcomes for our clients.