In tunnel engineering, subway construction, slope support, foundation reinforcement, and hydraulic anti-seepage projects, grouting pipes serve as the core channel for injecting slurry into geological formations or structural gaps. High pressure grouting pipes are specifically designed to withstand high grouting pressure, enabling effective injection of cement slurry, chemical grout, and other media into target areas to achieve geotechnical reinforcement, anti-seepage water stopping, and crack repair.

What Is a High Pressure Grouting Pipe?

A high pressure grouting pipe is a specialized pipe used in grouting engineering. It is typically made from seamless steel pipe or welded steel pipe as the base material, processed through drilling, slotting, and anti-corrosion treatment. Based on structure and application, high pressure grouting pipes mainly include the following types:

Perforated grouting pipe (spile pipe): The pipe body is drilled with grouting holes at regular intervals. It is used in tunnel pre-embedding and slope reinforcement, allowing slurry to seep evenly into the surrounding soil through the holes.
Tube a manchette (sleeve valve pipe): The pipe body is wrapped with rubber sleeves to form a one-way valve structure, enabling segmented, targeted, and repeatable grouting. It is suitable for fracture grouting and similar processes.
预埋注浆管 (pre-embedded grouting pipe): Pre-installed at concrete construction joints, cold joints, and other positions to seal leakage channels through post-construction grouting.
Pipe roof grouting pipe: A large-diameter, thick-walled steel pipe used for pre-support and advance grouting reinforcement in weak surrounding rock.

Key Performance Features

High pressure resistance: Manufactured from high-quality steel with uniform wall thickness, capable of withstanding high grouting pressure to prevent pipe bursting or joint failure during grouting operations.
Excellent sealing: Joints use threaded connections or specialized sealing structures to ensure no slurry leakage or pressure loss during high pressure grouting.
Uniform slurry discharge: The grouting holes on perforated pipes are precision-machined with uniform diameter and spacing, ensuring consistent slurry distribution.
Corrosion resistance: Galvanized treatment or anti-corrosion coating can be selected based on the working environment, adapting to humid and corrosive geological conditions.
Diverse specifications: Outer diameters range from 25mm to 325mm and above, with wall thicknesses from 3mm to 18mm. Materials include Q235B, 20# steel, Q345B, Q355B, and others to meet different project requirements.
Flexible customization: Supports custom length, hole diameter, hole pattern, and connection type to match different construction processes.

Common Applications

Tunnel engineering: Surrounding rock reinforcement, advance support, pipe roof grouting, and backfill grouting in tunnels.
Subway construction: Water stopping for station excavation pits, surrounding rock reinforcement for tunnel sections, and joint sealing.
Slope and foundation pit support: Soil reinforcement for slopes and anti-seepage water stopping for foundation pit sidewalls, often used in combination with rock bolts and soil nails.
Foundation reinforcement: Compaction grouting and fracture grouting for soft foundations to improve bearing capacity.
Hydraulic engineering: Anti-seepage curtain grouting for dams, embankment foundation reinforcement, and reservoir anti-seepage treatment.
Mining engineering: Surrounding rock reinforcement for mine roadways and goaf backfill grouting.
Building joint sealing: Pre-embedded grouting sealing for concrete construction joints, cold joints, and settlement joints.

Selection Tips

When selecting a high pressure grouting pipe, the following aspects are recommended:

Grouting pressure: Determine the rated peak grouting pressure of the project, and select pipe wall thickness and material with matching pressure capacity, while maintaining a reasonable safety margin.
Pipe material: Q235B or 20# steel pipe is suitable for standard cement slurry grouting. For chemical grout or corrosive environments, galvanized or anti-corrosion treated pipes are recommended.
Pipe diameter and wall thickness: Select appropriate diameter and wall thickness based on grouting volume, grouting depth, and pressure requirements. An undersized diameter will restrict flow, while insufficient wall thickness will compromise pressure safety.
Slurry discharge method: Choose perforated pipe (uniform multi-hole discharge), tube a manchette (segmented targeted discharge), or plain pipe (end discharge) based on the grouting process.
Connection type: Threaded connections offer better sealing and higher pressure capacity, suitable for high pressure grouting. Socket-type connections are easier to install and suitable for low pressure rapid construction.
Grouting media: Confirm that the pipe material is compatible with the cement slurry, chemical grout, or other media being injected to avoid corrosion or blockage.
Length and customization: Determine pipe length based on construction depth and hole layout. Non-standard customization is available when needed.

Usage and Construction Precautions

Inspect the pipe body for deformation, cracks, blocked grouting holes, or loose joints before grouting.

Never exceed the rated pressure capacity of the pipe during grouting operations.

Avoid excessive bending or damage from sharp objects during installation.

Flush out residual slurry from the pipe promptly after grouting to prevent solidification and blockage, especially for reusable grouting pipes.

Pre-embedded grouting pipes should be securely fixed before concrete pouring, ensuring that grouting holes face the joints that need to be sealed.

Regularly check joint sealing integrity and address any slurry leakage promptly.

Store in a moisture-proof and rust-proof manner, avoiding prolonged outdoor exposure.

Conclusion

High pressure grouting pipes are essential pipe materials in geotechnical reinforcement, anti-seepage water stopping, and structural repair engineering. Their pressure resistance, sealing performance, and machining precision directly affect grouting effectiveness and project quality. Proper selection based on specific engineering scenarios, combined with standardized construction practices, can effectively ensure the safety and reliability of grouting projects.

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