Abstract: A method for connecting a thermoplastic line element to a connecting element includes the steps of: providing the at least one thermoplastic line element; providing the connecting element having a thermoplastic body wherein a heating element is embedded in the body for generating heat in a welding region for welding the body to the at least one line element; joining the connecting element to the at least one thermoplastic line element; providing a welding device for welding the connecting element to the at least one thermoplastic line element; welding the connecting element to at least one thermoplastic line element by generating heat in the welding region using the welding device. The welding of the connecting element to the at least one thermoplastic line element is stopped by the welding device before the end of the planned welding duration if an error criterion is met.

Abstract: A floatable pipe combination has a plastic pipe having a rear longitudinal end, on which a rear flange region is formed, and a front longitudinal end, on which a front flange region is formed, a closing cover arranged on the rear longitudinal end, and a closing cover arranged on the front longitudinal end. A pulling device is arranged on the closing cover. At least on the front longitudinal end, a flange protection with an outer protective covering is arranged. The outer protective covering is formed to radially project with respect to the outer diameter of the plastic pipe.

Abstract: The invention relates to a weldable connecting element 2 for connecting or joining thermo-plastic line elements 3. The connecting element 2 comprises: a thermoplastic body 4; at least one heating element 6, which is embedded in the body 4, wherein the heating element 6 serves to generate heat in a welding area 5 for welding the body 4 to the at least one line element 3. Furthermore, a joining control 12 is provided, which is configured to prohibit the welding operation and/or to interrupt the welding operation if the body 4 and the line element 3 are not joined correctly.

Abstract: The invention relates to a method for connecting a thermoplastic line element (3) to a connecting element (2). The method comprises the steps of: providing the at least one thermoplastic line element (3); providing the connecting element (2) having a thermoplastic body (4 wherein a heating element (6 is embedded in the body (4 for generating heat in a welding region (5 for welding the body (4 to the at least one line element; joining the connecting element (2) to the at least one thermoplastic line element (3; providing a welding device (10) for welding the connecting element (2 to the at least one thermoplastic line element (3); welding the connecting element (2 at least one thermoplastic line element (3 by generating heat in the welding region (5 by means of the welding device (10). The welding of the connecting element (2) to the at least one thermoplastic line element (3) is stopped by the welding device (10) before the end of the planned welding duration if an error criterion is met.

Abstract: A method for assembly of a fitting with a pipe piece using a flange connection disposes centering elements on the fitting at a distance from one another on the circumference, and centering bolts are inserted into centering openings of the centering elements and into accommodation openings of the fitting. A collar surface of the pipe piece is aligned on alignment surfaces of the centering elements. Subsequently, a loose flange ring is aligned on the centering bolts via its passage openings. The fitting and the pipe piece, which are aligned with one another, are connected with one another by the flange ring as well as connection elements, and in this regard, the centering elements and centering bolts are removed. Also a method having a similar effect, for assembly of two pipe pieces uses a flange connection, as does a centering apparatus for assembly.

Abstract: A floatable pipe combination has a plastic pipe having a rear longitudinal end, on which a rear flange region is formed, and a front longitudinal end, on which a front flange region is formed, a closing cover arranged on the rear longitudinal end, and a closing cover arranged on the front longitudinal end. A pulling device is arranged on the closing cover. At least on the front longitudinal end, a flange protection with an outer protective covering is arranged. The outer protective covering is formed to radially project with respect to the outer diameter of the plastic pipe.

Abstract: A method for assembly of a fitting with a pipe piece using a flange connection disposes centering elements on the fitting at a distance from one another on the circumference, and centering bolts are inserted into centering openings of the centering elements and into accommodation openings of the fitting. A collar surface of the pipe piece is aligned on alignment surfaces of the centering elements. Subsequently, a loose flange ring is aligned on the centering bolts via its passage openings. The fitting and the pipe piece, which are aligned with one another, are connected with one another by the flange ring as well as connection elements, and in this regard, the centering elements and centering bolts are removed. Also a method having a similar effect, for assembly of two pipe pieces uses a flange connection, as does a centering apparatus for assembly.

Abstract: The invention relates to a pipe that has a plurality of layers including a main pipe body with opposite inner and outer circumferential surfaces. The pipe further includes an inner layer with an outer circumferential surface that is in integral face-to-face contact with the inner circumferential surface of the main pipe body. The inner layer is formed from a synthetic resin that is more abrasion resistant than the main pipe body.

Abstract: A concrete-protecting panel with integrated undercut protuberances which has an enhanced resistance to groundwater pressure. The protuberances or wing-element pairs (3) of the plastic panel (1) have spread wing elements (3) which may spread open even further in their top region 3.1. The wing elements 3 are connected to one another by a supporting web 4, of which the height is at least 70% of one wing-element pair. The wing-element pairs 2 are fastened on the base plate 5 of the protuberance-containing panel 1 via a foot widened in an arcuate manner.

Abstract: A process for fusion jointing or joining of pipe sections includes the steps of covering planed ends of the pipe pieces with an electric socket. The electric socket has a heating device disposed therein, and a heating output of the socket is such that an effective butt-jointing occurs between the pipe pieces. A bellows can be placed within the pipes to prevent collapse thereof, and to improve an inner bead quality of the pipe parts.

Abstract: A process for fusion jointing or joining of pipe sections includes the steps of covering planed ends of the pipe pieces with an electric socket. The electric socket has a heating device disposed therein, and a heating output of the socket is such that an effective butt-jointing occurs between the pipe pieces. A bellows can be placed within the pipes to prevent collapse thereof, and to improve an inner bead quality of the pipe parts.

Abstract: A method and apparatus for lining concrete structure elements includes a plastic sheet. The plastic sheet has a first layer formed of a heat-reflective material of a first color, with a plurality of attachments disposed on a first side thereof. A second layer is disposed upon a second side of the first layer. The second layer is formed of a material of a second color different from the first color. Reduced thermal expansion, improved concrete/liner bonding, and improved identification of defects is thereby provided.

Abstract: Device for joining of tubular parts (10, 11) made from plastic, especially polyvinylidene fluoride, polypropylene or polyethylene, in which aligned parts (10, 11) exhibiting about the same diameter are pushed together and are welded on abutting surfaces (12, 13) by effect of heat. Abutting surfaces (12, 13) of tubular parts (10, 11) in the direction of the inside pipe space are undercut or recessed so that the edge formed by inside surface (15) of tubular part (10, 11) and the abutting surface springs back opposite the edge formed by outside surface (18) of tubular part (10, 11) and abutting surface (12, 13), and so that parts (10, 11) in the area of abutting surfaces (12, 13) in the axial direction essentially are softened equally deeply, then pushed together and, as a result, are welded together. Especially wherein the heating element (20) consists of a fixed disk (23') and a heating ring (23") of metal with a PTFE-ring (21') which may be additionally fixed.

Abstract: An extrusion and calendering method is provided to produce a plastic panel, in particular for the lining of concrete containers, having strongly undercut anchoring elements. These protrusions preferably include flat-shaped wings which are arranged approximately V-shaped, forming an angle with and being offset in their width from each other. The leading wing upon the manufacturing process has a smaller angle to the normal through the panel base. The wings may also, differing from the rectangular cross sectional shape described, have a round, oval, elliptical or square cross section.