Jet Grouting

jet grouting technology

Jet grouting working method

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High-pressure jet grouting, also known as jet grouting technology, is a ground improvement method that involves injecting a high-pressure jet of cement grout into the soil to create a soil-cement column. The process involves drilling a borehole into the ground and inserting a high-pressure jet nozzle into the soil. The nozzle is then rotated and moved up and down while grout is injected at high pressure, creating a soil-cement column.
Jet grouting technology is commonly used for ground improvement, soil stabilization, and foundation support in construction projects. It can also be used for environmental remediation, such as sealing underground storage tanks or stabilizing contaminated soil.
The equipment used for jet grouting includes a drilling rig, a high-pressure grout pump, a jet nozzle, and a monitoring system to ensure the quality of the grout injection. The process can be performed in various soil types, including clay, sand, and gravel.

Jet grouting Equipment

Micropiling Drilling rig/multipurpose drilling rig

Its modular design is engineered for the execution of:
Micropiles, Tie-backs, Jet-grouting, Drain, Water wells.
The rig is fitted with proportional, hydraulic servo-assisted controls that make the operations smooth. Featured with Load Sensing System, it has lower running costs and a reduced wear and tear on components.

high-pressure grout pump

The high pressure jet grouting pump is a critical component of the jet grouting process. It is used to inject the grout into the soil or rock at high pressure to create the soil-cement columns. The pump typically consists of a hydraulic power unit, a grout mixer, and a high-pressure pump.
The hydraulic power unit provides the power to operate the pump and mixer. It typically includes a diesel engine or an electric motor, a hydraulic pump, and a control system. The grout mixer is used to mix the cement, water, and other additives to create the grout. The high-pressure pump is used to inject the grout into the soil or rock at pressures ranging from 10 to 40 MPa (1450 to 5800 psi).
The high pressure jet grouting pump is designed to be highly efficient and reliable, with features such as automatic pressure control, flow rate control, and grout mixing control. It is also designed to be portable and easy to transport to different job sites.
The selection of the high pressure jet grouting pump depends on the specific requirements of the project, such as the size and depth of the soil-cement columns, the type of soil or rock, and the required grout flow rate and pressure.

Drilling rods and Jet nozzles

Drilling rods and nozzles are important components of the jet grouting process.
Drilling rods are used to advance the drill bit into the soil or rock. They are typically made of steel and come in various lengths and diameters depending on the specific requirements of the project. The drilling rods are connected together to form a drill string, which is rotated by the drilling rig to advance the drill bit into the ground.
Nozzles are used to inject the grout into the soil or rock. They are typically made of steel or tungsten carbide and come in various sizes and shapes depending on the specific requirements of the project. The nozzles are attached to the end of the drilling rods and are designed to create a high-pressure jet of grout that penetrates the soil or rock and mixes with it to form a soil-cement column.
The size and shape of the nozzles can be adjusted to control the size and shape of the soil-cement column. For example, a larger nozzle may be used to create a wider column, while a smaller nozzle may be used to create a more narrow column. The orientation of the nozzles can also be adjusted to create columns that are vertical, inclined, or even curved, depending on the specific requirements of the project.

Jet grouting monitoring system

The monitoring system used during the jet grouting process is typically composed of sensors and instruments that measure various parameters related to the grout injection, such as injection pressure, flow rate, and grout volume. These sensors are typically installed on the drilling rig or on the grout pump, and they provide real-time feedback to the operator about the quality of the grout injection.
The monitoring system is important because it allows the operator to adjust the injection parameters in real-time to ensure that the grout is being injected at the correct pressure and flow rate, and that the correct amount of grout is being injected into the soil. This helps to ensure that the soil-cement column is being created to the desired specifications and that it will provide the necessary support or stabilization for the construction project.
In addition to the real-time monitoring system, post-injection testing can also be performed to verify the quality of the soil-cement column. This may involve drilling core samples from the column and performing laboratory tests to measure its strength and other properties.

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Finished Jet grouting soil-cement columns