Gouda Geo-Equipment B.V. products

CPT sounding tubes are used to push the electrical or mechanical cone into the ground by means of a CPT penetrometer pusher. Gouda-Geo CPT sounding tubes meet the highest quality standards. The tube material is manufactured by one of Europe’s leading steel manufacturers according to our own standards. No distinction whatsoever is made between tubes for 100 kN and 200 kN testing. All tubes are suitable for any pushing force and for any type of test, i.e. electrical or mechanical Cone Penetration Testing.

Gouda-Geo CPT sounding tubes meet the highest quality standards. The tube material is manufactured by one of Europe’s leading steel manufacturers according to our own standards. Especially for the so-called “Deep Sounding” projects and nearshore CPT testing Gouda-Geo has developed the heavy-duty CPT sounding tubes with an outer diameter of 44 mm. When you contemplate to use these tubes, please realise that most probably your push-and-pull clamp needs to be adapted. Gouda-Geo supplies a set of 2 clamping block holders with 44mm clamping blocks and a set of 2 filling plates who keep the clamping blocks in place to make the CPT push-and-pull clamp suitable for these 44 mm CPT sounding tubes.

A friction reducer (OD = 36 mm) combines two purposes. It connects the piezocone, electrical CPT cone or mechanical cone to the first CPT sounding tube and it reduces the lateral friction on the string of CPT sounding tubes during cone penetration testing.

Gouda-Geo casing tubes meet the highest quality standards. The tube material is manufactured by one of Europe’s leading steel manufacturers according to our own standards. Casing tubes are generally applied when doing Cone Penetration Tests in unstable soils or working over water or in other situations where the risk of buckling or breaking of the CPT sounding tubes is present through insufficient lateral support. The casing tubes are placed when the CPT string, after having penetrated a soft layer of considerable thickness with little lateral support, hits a much harder layer. The CPT testing procedure is interrupted and the casing tubes are placed. A casing cutting shoe of hardened steel is put on the first casing tube in order to protect the otherwise exposed thread.

Regularly CPT penetrometer pushing rigs are used to push in the measuring instrument of the Marchetti DMT dilatometer. In order to connect the blade to the string of CPT sounding tubes a cross-over tube is needed in order to overcome the differences in threads.