Abstract: In a method for the trenchless laying of pipes, a drilling operation (5) is firstly carried out by means of controlled heading from a starting point (1) to a finishing point (6). Then the drilling head (3) is disconnected from the heading pipes (4) and the heading pipe run is connected by means of a special connecting pipe to the product pipe run (9), which is prefabricated above ground at the finishing point (6). Subsequently, the heading pipes (4) are drawn back from the drill hole to the starting point (1), the product pipe run (9) simultaneously being drawn into the drill hole.

Abstract: In a method for the trenchless laying of pipes, a drilling operation (5) is firstly carried out by means of controlled heading from a starting point (1) to a finishing point (6). Then the drilling head (3) is disconnected from the heading pipes (4) and the heading pipe run is connected by means of a special connecting pipe to the product pipe run (9), which is prefabricated above ground at the finishing point (6). Subsequently, the heading pipes (4) are drawn back from the drill hole to the starting point (1), the product pipe run (9) simultaneously being drawn into the drill hole. The method is suitable in particular for laying large-caliber, tension-resistant pressure pipelines (for example of steel or polyethylene) in soils that are not suitable, or only with reservations, for other laying methods (for example gravels, crushed stones, rock).

Abstract: A frame member for electrical distribution cabinets, whose particularity consists of the fact that it has a substantially triangular transverse cross-section and that it has two ribs, which are arranged longitudinally along the extension of the frame member and are suitable to allow the engagement of a finishing element for finishing the frame member.

Abstract: In the case of a cable lead-through (5), in particular in panel form, of a pliable material, which is surrounded by a frame (6), in particular for a wall (2) or a ceiling or for a base (3) of a distribution cabinet, a distribution box or a junction box (1) or of a meter cabinet or the like, the cable lead-through (5) is produced from an elastomerically crosslinked material.

Abstract: In a method for keeping outfall drainage in service whilst constructing sewerage, wherein a main drain is laid in the position of an old drain or in a new line by pipe or shield tunnelling under closed or semi-open construction using a working pipe or shield (1) at the tunnelling end (9), at essentially the same time as the working pipe or shield (1) is tunnelling, at least one outfall drain (30) is laid below ground through at least one working orifice (20) in the working pipe or shield (1), so that the outfall drain (30) lies alongside the main drain. A device suitable for implementing the method has a working pipe or a shield (1) with at least one working orifice (20) for laying at least one underground outfall drain (30) alongside the main drain from the interior of the working pipe or shield (1).

Abstract: A clamp for holding elongated workpieces in angular abutment with each other includes a base, a first pair of clamping jaws formed by two sides of an angular member, the sides defining between them an angle and an angular sector, a guide on the base for guiding displacement of the angular member on the base along a line bisecting the angle, a lock for locking the angular member on the base, a clamping member displaceable relative to the base along a line parallel to the line bisecting the angle, a pair of first and second levers pivotally coupled to each other at one end of each lever, the first lever being pivotally coupled to the base at an end opposite the second lever and the end of the second lever opposite the first lever being pivotally coupled to the clamping member, and a second pair of clamping jaws, each pivotally connected to one of the pair of first and second levers.

Abstract: Thrust pipe for disposition in a passage in the ground by advance of the pipe axially through the passage includes a plurality of pipe segments disposed in end-to-end relation one to the other. Each pipe segment includes an inner pipe section having a diametrically enlarged end for telescopically receiving the opposite end of an adjacent inner pipe section. The pipe segments each include an outer pipe section, substantially enveloping a corresponding inner pipe section. The outer surface of the pipe segments is smooth and substantially continuous. Each outer pipe section at one end terminates short of the end of the corresponding inner pipe seciton and is spaced from the outer pipe section of the adjacent pipe segment whereby compressive loadings from thrusting the pipe axially through the passage are carried by the inner pipe sections and not be the outer pipe sections.

Abstract: The screw of a marine propulsion unit is mounted in a passage of an elongated casing in an axially central position. The two axially terminal portions of the passage contain protective devices for preventing accidental insertion of a limb of a human adult or child to a depth sufficient to reach the rotating screw without preventing flow of water through the terminal passage portions.