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Demonstation of the Keyhole method for Gasnetz Hamburg

08.04.19 - The gas network of the free and Hanseatic city of Hamburg consists of approx. 7,900 km of pipelines and around 160,000 service connections for almost 230,000 network customers. Within the framework of a week-long demonstration the urban operator Gasnetz Hamburg GmbH convinced itself of the benefits of the minimally invasive procedure for the quick and gentle production of gas service connections from a small circular pit with a maximum diameter of 65 cm.
For producing the keyhole the concrete or asphalt core is drilled out with a core drill from the road over the main line and the soil is then suctioned with a suction dredger up to the main line without damaging nearby cables. In the Hamburg area many supply lines lie beside the road, meaning it was not necessary here to cut out the core and cement it back together again. The keyhole serves as the start pit for the small drilling rig that was developed specially for this method, the GRUNDOPIT KS50, which can also be used from a pit only 65 cm wide. Following completion of the underground installation work the main line is connected from the surface and the keyhole or the narrow pit is filled.

KEYHOLE TECHNOLOGY IMPRESSES IN PRACTICE

The demonstration for Gasnetz Hamburg GmbH and Wähler from Bremerhaven at the end of last year showed how fast and reliable this method works in practice. The suction excavator was supplied by Wähler. In the course of the demonstration week in the Hamburg area a total of four bores were completed for three service connections over three days, whereby the final bore was successfully done from a narrow pit with a width of 65 cm. For two service connections 32 mm PE lines were laid and for one service connection a 63 mm PE line was laid. The spectators were particularly impressed by the small space requirement of the machine technology and the short speedy construction. The set-up times were very short at less than 30 minutes and the execution was also very quick. A 12.5 m long pilot bore only took around 30 minutes, the conversion and connection of the pipe each took 20 minutes, upsizing the bore hole and pipe installation only 25 minutes. The minimal intervention in existing surfaces and road traffic, as well as the fast restoration afterwards, were also impressive.

OFFER FOR SUPPLIERS AND NETWORK OPERATORS

We offer a special introductory package at attractive conditions for suppliers or network operators who are interested in a demonstration of the minimally invasive keyhole method in their area. The 'Service Connection Technology' service package includes supply, transport and set-up of the trenchless technology, the execution of the bores and the installation of the lines, as well as support with the connection work from qualified personnel. The documentation and analysis of the measure, as well as a presentation of the method, are also included in the package. Please contact our Sales Department if you are interested in a demonstration.
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