Sonic Logging Tube Installation Procedure and Quality Acceptance Checklist

Published on 2026-10-17

Hengshui Zhanhe Engineering Rubber Co., Ltd. supplies sonic logging tube and related engineering rubber products to contractors, distributors and infrastructure projects worldwide. Steel tubes tied to the reinforcement cage before concreting, giving ultrasonic probes a clear path up and down the pile so the shaft can be checked for integrity.

This article explains the working principle, main types, typical applications, installation points, selection criteria, standards and frequently asked questions about sonic logging tube, and is intended for engineers, purchasers and project managers.

1. What Is Sonic Logging Tube?

Steel tubes tied to the reinforcement cage before concreting, giving ultrasonic probes a clear path up and down the pile so the shaft can be checked for integrity.

Working principle: The product works through elastic deformation and mechanical interlock to provide reliable sealing or load transfer.

2. Main Types

• Clamp type: joined with a hydraulic press, no welding or threading needed
• Screw type: threaded coupling with sealing, coupling reusable
• Sleeve type: spigot and socket joint, used for large-diameter deep piles
• PVC type: low cost for shallow piles and temporary testing

3. Typical Applications

• Bored and rotary-drilled cast-in-place piles for highway and building foundations
• Large-diameter piles and diaphragm walls needing several test profiles
• Wind turbine foundations, transmission tower foundations and port piles
• Piles with a spare tube kept for later re-testing or cross-hole tomography

4. Installation and Construction Points

1. Decide the number and position of tubes by pile diameter and tie them evenly and parallel to the cage
2. Join with a hydraulic press to the specified indentation, or screw up with sealing tape or rings so no slurry enters
3. Fit the bottom and top caps, leaving 300-500 mm of tube above pile head level
4. Fill with clean water once the cage is lowered and watch the level for leaks
5. Avoid striking the tubes with the tremie pipe during concreting
6. Check water flow again before testing and flush any blockage with high-pressure water

5. Selection Guide

• Confirm the design displacement, load grade and service environment before ordering.
• Select material grade according to temperature range, medium and durability requirements.
• Provide drawings or a specification list so that the manufacturer can verify sizes.

6. Standards and Quality Control

Sonic Logging Tube is manufactured and inspected according to applicable national and industry standards. Hengshui Zhanhe Engineering Rubber Co., Ltd. carries out batch inspection before delivery, and inspection certificates together with third-party test reports (where required by the project) can be provided.

Typical standards applied to this product family include Chinese national and transportation industry standards; equivalent international standards can be referenced upon request.

7. FAQ

Q: What if too few tubes were installed?

A: The test profiles will not cover the whole section. Coring or low-strain testing can supplement, but coring only shows a local core. Decide the tube count by diameter at the outset and do not reduce it for piles above 1.6 m.

Q: Why clean water and not bentonite slurry?

A: Slurry carries solids that attenuate the signal and make wave velocity unstable, so the data cannot be read. Fill with clean water before concreting and check for leaks, since a leaking tube admits slurry and blocks.

Q: How is a blocked tube dealt with?

A: Flush with high-pressure water and rod it through. If that fails, drilling out the blockage may be possible but damages the pile and needs the designer's agreement; otherwise use coring or additional low-strain testing. Prevention lies in pressing the joints properly and checking the water level.

Q: What about the zinc coating?

A: The coating is the main corrosion protection in wet ground and concrete, with hot-dip zinc generally not less than 60 g/m2 on both faces. Avoid scoring it and deforming the tube ends in transport; deformed lengths should not be used.

8. Price Factors

Priced per metre, based on the strip or tube cost, wall thickness, zinc coating weight and the joint forming method. A standard 57 x 1.5 mm clamp-type galvanised tube is commonly quoted at 12-25 yuan per metre, rising with each step in wall thickness or coating weight. Quantity is the pile length plus 0.3-0.5 m above the head, times the number of tubes, with couplings and caps counted separately.

Packing: standard export packing (woven bags, pallets or wooden cases). Delivery terms: EXW, FOB, CFR, CIF or DAP as agreed. Payment terms: T/T, L/C or other terms subject to negotiation.

9. Why Work With Hengshui Zhanhe Engineering Rubber Co., Ltd.

• Manufacturer based in Hengshui, Hebei — the engineering rubber industry cluster in North China, with in-house production and inspection.
• OEM and ODM supported: sizes, hardness, profiles and packaging can be customized to project or market requirements.
• Batch inspection before shipment; certificates of conformity and third-party test reports available when required.
• Technical support for selection, shop drawings and installation guidance, with export packing and worldwide logistics arrangement.

10. Contact and Quotation

For specification sheets, samples, pricing or project support, please contact Hengshui Zhanhe Engineering Rubber Co., Ltd.. Email: 150051331@qq.com · Tel/WhatsApp: +86-13833886677 · Factory: No.168, Zhangtuantuo Village, Dengzhuang Town, Taocheng District, Hengshui, Hebei, China. We reply to export enquiries within 24 hours on working days.