The dynamic pipe bursting method with GRUNDOCRACK

With the dynamic pipe bursting system, old pipes made of stoneware, asbestos cement, grey cast iron, plastic or plain concrete are shattered and simultaneously replaced by new HDPE pipes (long and short pipes) or PVC-U pipes. Intermediate pits are necessary for strong bends and branches. The starting and exit pits can be used as inspection chambers..

Pipe bursting is applied when  /in case of

• the static of the old pipe is disturbed
• repair/renovation is no longer possible, e.g. in cases of misalignment, breakage,
• missing pipe base or partial collapse
• the hydraulic capacity has to be improved
• a new pipe with a longer wear reserve is required

The pipe bursting machine smashes the damaged old pipe and radially displaces the shards into the surrounding soil. The bore hole for the new pipe is extended at the same time. The pulling force of the winch supports the bursting machine and guarantees sure guidance through the specified path. Usually, the soil around the old pipe is easily displaced. There are hardly any limitations. The displacability of the soil around the old pipe allows the use of a larger pipe (one or perhaps two nominal sizes larger than the old pipe), if this is required. Groundwater lowering is normally not necessary, however, start and exit pit must be kept free from water. Following the propulsion, the annulus around the new pipe can gradually be filled up. A ring of mortar builds up a complete surface adhesion, together with pipe and surrounding soil (see fig.).

1. Machinen technology

	Grundocrack with front short pipe expander with cutting blade and cable connection
	Grundocrack with front expander with cutting blade and PE pipe link for long pipes
	Grundocrack with rear expander with cutting blade and PE pipe link for long pipes
	Grundocrack mini machines for manhole-manhole application or smallest pits of only 1 m Ø / length.

2. Front and rear expander

The front expander is used e.g. if the exit pit is also an inspection chamber. The expander can be disconnected from the machine and recovered in the inspection chamber. The bursting machine, which is longer, can be pulled back to the starting pit through the installed pipe and taken out.

With a rear expander, the bursting machine can be used as a guiding head in the old pipe.

3. Winch

The special winch GRUNDOWINCH supports the bursting process with static pulling force and maintains stability of direction. It is equipped with a hydraulic pulling force pre-selection with self-tailing mechanism, in order to keep the pre-tension constant even with increasing resistance.

Hier erhalten Sie weitere Informationen zum dynamische Berstlining-Verfahren