φ57 Threaded Type Sonic Logging Pipe (57mm Screw-On CSL Pipe)

The φ57 (57mm OD) Threaded Type CSL Pipe is an ultra-heavy-duty, large-diameter solution specifically engineered for deep foundation piles, high-rise structural foundations, and massive bridge piers (such as high-speed rail and marine crossings). The enlarged 57mm structural diameter delivers exceptional vertical stiffness, preventing localized tube bending and column buckling under heavy rebar cage stresses. Combined with high-precision threads, it provides maximum anti-pull-out strength and structural alignment.

φ50 threaded type sonic logging pipe (50mm screw on csl pipe)

Key Features & Advantages

Maximum Bending Stiffness: The thick-walled 57mm steel column provides unmatched resistance to lateral concrete flow and soil shifting, ensuring a perfectly straight testing line.

Heavy-Duty Self-Locking Coupling: Precision-machined coarse threads provide a highly secure, mechanical lock designed to withstand extreme vertical and pulling loads without decoupling.

Extreme Slurry Protection: Features an integrated heavy-duty EPDM rubber sealing gasket inside a specialized compression groove, guaranteeing zero leakage under extreme hydrostatic pressure.

Accommodates Advanced Probe Systems: The spacious internal diameter comfortably accommodates standard, heavy-duty, or dual ultrasonic testing probes, preventing blockages.

Technical Specifications

The φ57 threaded sonic logging pipe is manufactured to heavy-duty structural tolerances:

Parameter	Specification Details
Outer Diameter (OD)	57 mm
Wall Thickness (WT)	1.0 mm to 3.5 mm
Material Grade	High-Grade Carbon Steel (ST37 / Q235 / Q345)
Thread Type	Specially engineered coarse thread for rapid field engagement
Standard Length	6 m, 9 m, 12 m (Customizable)
Surface Treatment	Bare (uncoated) / Anti-corrosion Oiled

Quality Assurance & Structural Compliance

Concentricity & Ovality Inspections

Every batch of φ57 heavy-duty pipes undergoes strict concentricity and ovality checks to guarantee smooth thread alignment and prevent ultrasonic wave refraction during CSL testing.

Rigorous Leak-Proof Validation

Our threaded connections are pressure-verified to withstand intense external hydrostatic pressures, keeping the acoustic testing channel dry and clean during deep concrete pours.

Installation Instructions

Prep: Remove the protective thread caps from both ends and inspect the threads and rubber seals.

Align: Position the upper φ57 pipe vertically over the lower pipe’s threaded coupling.

Tighten: Hand-tighten the joints, then use a standard pipe wrench to apply final torque, fully compressing the rubber gasket.

Frequently Asked Questions (FAQ)

Q: What is a φ57 Threaded (Screw-on) sonic logging pipe, and when should I choose it over the press-fit type?

A: A φ57 Threaded sonic logging pipe utilizes high-precision male and female screw threads at the pipe ends, equipped with a heavy-duty rubber O-ring gasket. You should choose the threaded type for deep foundation piles (typically exceeding 30 to 50 meters) or heavy rebar cages. While press-fit types are great for speed in shallow-to-medium piles, threaded joints provide significantly higher tensile and torsional strength, ensuring the pipe string won’t break, cross-thread, or decouple when lowering heavy steel cages into deep boreholes.ically exceeding 30 to 50 meters) or heavy rebar cages. While press-fit types are great for speed in shallow-to-medium piles, threaded joints provide significantly higher tensile and torsional strength, ensuring the pipe string won’t break, cross-thread, or decouple when lowering heavy steel cages into deep boreholes.

Q: How do φ57 threaded joints guarantee zero slurry leakage under high hydrostatic pressure in deep piles?

A: Deep piling exposes the tube to intense subterranean water and concrete pressure. Our φ57 threaded sonic logging tubes feature an engineered tapered or straight thread coupling system with an integrated rubber sealing ring. As the male and female ends are screwed tightly together, the rubber ring is mechanically compressed inside a specialized groove, forming a gas-tight, liquid-tight barrier. It easily withstands deep hydraulic pressures, preventing any slurry from entering and blocking the ultrasonic testing channel.

Q: Do I need any special welding certification or heavy machinery to install φ57 threaded sonic tubes on-site?

A: Not at all. One of the primary advantages of our screw-on sonic tubes is 100% weld-free on-site installation. No expensive welding machines or certified welders are required. The pipes can be hand-threaded initially and then easily torqued to a secure lock using standard pipe wrenches (pipe tongs) directly on the rebar cage platform, saving substantial project time and cutting labor costs.

Q: What steel grades and dimensional specs are available for your φ57 threaded sonic logging tubes?

A: We supply premium cold-drawn carbon steel tubes complying with ASTM A53, EN 10219, and global non-destructive testing (NDT) guidelines. Standard Outer Diameter is 57mm, with wall thicknesses optimized from 1.5mm up to 3.5mm for heavy-duty deep-well resistance. Our precise dimensional tolerance ensures uniform wall thickness, preventing ultrasonic wave refraction and ensuring highly accurate Crosshole Sonic Logging (CSL) test results.

Q: Do the φ57 threaded sonic tubes come with bottom caps, top plugs, and necessary installation accessories?

A: Yes, we supply a fully integrated system. Each set can be ordered with pre-welded watertight steel bottom caps (to seal the base of the pipe string) and removable plastic or steel top plugs to prevent mud, concrete splashes, or debris from falling into the tube during the construction phase before testing begins.