01
Fit the end cap
Push a rubber end cap onto the bottom of the first tube.
Sonic logging tubes
Push-fit steel access tubes for crosshole sonic logging (CSL), the standard integrity test for bored piles and drilled shafts.
How CSL testing works
Checking the concrete inside the pile
Crosshole sonic logging tests the concrete inside a bored pile after it is cast. It finds voids, soil inclusions, honeycombing and necking within the reinforcement cage, and is more precise there than a sonic echo test from the pile head.
Steel access tubes are tied to the inside of the rebar cage for the full depth of the pile. Once the concrete is placed, the tubes are filled with water. The test engineer lowers an ultrasonic transmitter down one tube and a receiver down another, then pulls both up together.
Sound concrete carries the signal quickly from tube to tube. A defect slows it down or blocks it. Every pair of tubes is logged in turn, giving a profile of the whole pile that the engineer reviews on site and again in the office. The method is set out in ASTM D6760.
The project specification sets how many tubes each pile needs, usually based on the pile diameter.
- Water-filled access tube
- Transmitter
- Receiver
- Ultrasonic signal
- Defect in the concrete
The tube
Push-fit, gasket-sealed, no welding
Our sonic tubes are thin-walled black annealed steel with a bell mouth formed on one end. The plain end of the next tube pushes into the bell, where a rubber gasket seals the joint so grout and slurry can't get in and block the probe.
- Rubber end capCloses the bottom of the first tube so concrete, slurry and grout stay out.
- Steel discSits inside the end cap to keep it firm against the tube end.
- Fixing earsWire tie points along the tube for fixing it to the rebar cage.
- Bell mouthThe enlarged end of each tube that takes the plain end of the next one.
- Rubber gasketSeats in the bell mouth and seals the joint watertight.
- Push-fit markA painted band that shows when a joint is pushed fully home.
Why push-fit
- Quick to install by hand
- Push-fit joints, no welding on site
- No tools or equipment needed
- Ties straight to the rebar cage
- Push-fit mark confirms full engagement
- Watertight joint keeps the tube clear for the probe
Two bell mouth types
FlaredA smooth flared bell with the gasket seated inside.
GroovedRolled grooves in the bell locate the gasket.
Specifications
Sizes
50 mm tubes are in stock at our Al Quoz warehouse. Other diameters are supplied to order.
| Outside diameter | 48 mm | 50 mm | 60 mm | 100 mm | 114 mm |
|---|---|---|---|---|---|
| Wall thickness | 0.8 mm | 1.0 mm | 1.5 mm | 1.5 mm | 1.5 mm |
| Length | 5.8 m | ||||
| Weight per tube (approx.) | 5.4 kg | 7.0 kg | 12.6 kg | 21.1 kg | 24.1 kg |
| Joint | Push-fit bell mouth with rubber gasket | ||||
| Availability | On request | In stock | On request | On request | On request |
Weights are calculated for plain steel tube and are a guide only. End caps, gaskets and steel discs are supplied to match.
Installation
Fixing tubes to the cage
Done by hand at the cage, before it is lifted into the bore.
02
Tie the first tube
Tie steel wire around the fixing ears and the cage bars to hold the tube in place.
03
Position the next tube
Tie the next tube to the cage in line with the first, the same way.
04
Push the joint home
Push the two tubes together until the push-fit mark reaches the bell mouth.
05
Wire the ears together
Line up the fixing ears either side of the joint and wire them tightly together.
06
Repeat to the top
Carry on until the tubes run the full length of the cage, then cap the top until testing.
Ready stockAl Quoz 2, Dubai
In stock in Dubai
Racked and ready to load
We hold 50 mm x 1.0 mm x 5.8 m sonic pipe in our Al Quoz warehouse, with end caps and gaskets to match.
Send us the number of piles, the pile depth and how many tubes each pile takes. We'll work out the tube count, caps and gaskets, and come back with a price and delivery to your site anywhere in the GCC.
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