Abstract:
Method for protecting a cable or a pipe which includes the following stages: a geotextile strip is shaped like a sheath around the cable or pipe; and the strip is fixed around the cable or pipe. The strip includes a single sheet of at least one layer of nonwoven material. The nonwoven material can be a multilayer material with a central layer of a nonwoven material with a low density and high mechanical strength and at least one outer layer covering it on at least one side, and advantageously on both sides, of higher-density nonwoven material. The geotextile can be heat-sealable and the fixing can in particular be carried out by heat-sealing.
Abstract:
There is described a method of laying pipe (20) through a fill (12) of loosely packed materials, where the pipe is installed between a pointed front section (36) and a rear section (50) of a tool, and the rear section is subjected to a drive force in the longitudinal direction, so that the pointed section and the pipe is pushed into the loosely packed materials. The method is characterized by that in the event that the progress is halted due to an inadvertent hindrance in the loosely packed materials, the tool and the pipe connected thereto is pulled back by exerting a tractive force on a tractive means (80) connected to the pointed front section. Preferably the tractive means is a line (80) in the shape of a wire and/or a chain, fixed to the front section (32), where the line runs within the pipe connected to the rear section (50), and the tractive force is controlled by the tool operator.
Abstract:
A device for installing pipe is provided comprised of a chassis and pivotal shoe connected to such a chassis. The chassis is formed with a metallic frame supported above the ground by a pair of wheels and at its forwardmost portion by a hitch and skid plate. The chassis includes an upright beam and at least one support beam as well as a main beam which extends longitudinally from the front of the frame until it engages with the shoe. A pair of cylinders connect the main beam to the upright beam and shoe respectively. The shoe is preferably hollow with a pipe channel interconnecting the front and rear walls. Preferably the device includes a laser system of the type known in the art.
Abstract:
A mechanized unit is provided for digging a trench in the ground and laying elongate objects in the trench, including a motor driven vehicle, a digging wheel connected to the rear of the vehicle, and a reserve connected to the front of the vehicle and containing said elongate objects, and a guide device for laying said objects in the vicinity of the bottom of the trench, the device being connected to the vehicle, said mechanized unit further including a receptacle connected to the vehicle and containing a fine powdery material and means for feeding said material from the receptacle to the guide device so that, during formation of the trench by the digging wheel, said elongate objects are buried in the fine powdery material deposited in said trench.
Abstract:
Method of laying pipelines on land, in which straight pipe pieces are aligned to each other above the trench route and are welded together, and the thus formed pipeline in welded condition is bent to an extent and in a direction defined by the trench route and subsequently is lowered down in a trench.
Abstract:
A horizontal wellpointing system is provided wherein a trenching vehicle digs a trench while perforated flexible pipe having a filter material is placed along the trench. The pipe is covered as the trench is refilled and a subsequent evacuating pressure is applied to the pipe by an above ground pump.
Abstract:
Apparatus for laying pipe underground in a continuous process and usable with a heavy duty vehicle having a ditching plow attached thereto. The apparatus includes means for receiving lengths of pipe which are not positively connected together and forcing such lengths of pipe through the ditching plow in a manner that the pipe will remain in assembled relationship after such pipe has been laid.
Abstract:
The invention is a method and apparatus for the trenchless laying of pipe underground, in which a mole plough is forced through the ground by means of a tractor or winch to form an underground tunnel, and a continuous length of flexible sleeving, for example made of polythene, is fed down through the hollow coulter of the advancing mole plough and is laid in the newly formed tunnel behind the mole; and at the same time a length of rigid pipe is thrust forwards lengthwise into the tunnel and within the sleeving laid behind the advancing mole plough, by means of a driving machine including sets of pneumatic-tiered driving rollers between which the pipe is frictionally engaged. The pipe length is forced forwardly within the sleeving from the start of the underground tunnel at a speed which is coordinated with the speed of travel of the mole plough, for example by means of a trailing marker, so that the leading end of the pipe length follows closely behind the rear of the advancing mole. In this way the pipe length is pushed into its final position enclosed in the protective sleeving which protects it against corrosive attack by soil water. If desired cement grout may be injected into the sleeving to form an auxiliary protective coating around the pipe.