φ25 Steel Grouting Pipe (25mm) for Micro-Piles & Joints

Our φ25 (25mm OD) Steel Grouting Pipes are designed for precision delivery of cement slurry, chemical grouts, or sealing resins in micro-piles, narrow boreholes, and structural construction joints. This compact, high-tensile steel tube is ideal for low-to-medium volume, high-pressure injection where space is limited and absolute structural stability is required.

Available in both perforated "flower pipe" configurations (with one-way check valves) and solid plain-wall configurations, the φ25 system provides precise grout placement to reinforce soil matrices and seal joint cracks.

Key Features & Advantages

Precision Grout Placement: Optimized for 25mm diameter applications, the precisely spaced laser-drilled holes and elastic sleeve valves distribute slurry evenly along micro-piles and structural seams.

High Burst Pressure Resistance: Engineered to withstand high injection pressures without deforming, ensuring safe and successful consolidation in deep subterranean zones.

Compact & Lightweight Handling: The φ25 design is easy to handle, integrate into tight reinforcement cages, or insert into narrow, pre-drilled micro-pile holes.

Corrosion Resistance Options: Available in hot-dip galvanized steel to withstand harsh underground chemistry, acidic soils, and prolonged exposure to groundwater.

Technical Specifications

The φ25 grouting pipe is manufactured under strict dimensional control to prevent connection issues in tight spaces:

Parameter	Specification Details
Outer Diameter (OD)	25 mm
Wall Thickness (WT)	1.0 mm to 3.0 mm
Material Grade	Carbon Steel (Q235/Q355), Galvanized Steel, PVC/PE
Type Configurations	Perforated (Flower Pipe with check valves) or Plain Solid Wall
Connection Method	Threaded Coupling, Socket, or Sleeve Welded
Hole Pattern	Spiral or Staggered laser-drilled patterns

Primary Applications

Micro-Piling & Pin Piles: Enhancing the load-bearing capacity of micro-piles in residential, commercial, or structural retrofitting projects.

Construction Joint Waterproofing: Providing target-area chemical grouting to seal construction joints in dams, basements, and retaining walls.

Consolidation Grouting: Void filling and ground consolidation in narrow boreholes or fractured concrete structures.

Quality Assurance & Performance Testing

To ensure reliability on-site, every batch of φ25 grouting pipes undergoes strict pressure tests. We verify that the integrated elastic check valves open at the designated pumping pressure and seal tightly upon pressure release, preventing slurry or groundwater backflow.

Frequently Asked Questions (FAQ)

Q: What steel grades do you use for your φ25 grouting pipes?

A: Our φ25 grouting pipes are manufactured from high-tensile carbon steel (typically Q235B, ASTM A53, or EN 10219). These grades provide the necessary yield strength and structural rigidity to resist lateral soil pressures and high pumping pressures during narrow-bore injection.

Q: How do the injection check valves on the φ25 pipe prevent clogging?

A: The laser-drilled holes are wrapped tightly with high-elasticity rubber sleeves or sealing tapes acting as one-way check valves. Under pumping pressure, the slurry expands the sleeve and flows into the soil. Once pumping stops, the sleeve snaps back, preventing mud, sand, or groundwater from entering and clogging the pipe.

Q: What connection methods are recommended for φ25 grouting pipes?

A: We highly recommend our weld-free threaded couplings for φ25 pipes. They allow quick manual assembly without on-site welding equipment, maintaining tight tolerances and ensuring leak-proof joints under high-pressure injection.

Q: Can the φ25 pipe be used with self-drilling anchor bits?

A: Yes, the φ25 pipe can be configured as a lead pipe equipped with a sacrificial alloy drill bit. This setup allows simultaneous drilling and grouting in collapsing or soft soils, eliminating the need for temporary casing.

Q: Do you support custom perforation patterns for φ25 tubes?

A: Yes. We support full customization, including custom pipe lengths (e.g., 3m, 4m, 6m), custom wall thicknesses, and specific hole diameters or spacing layouts to match your geotechnical project designs.