RU2188913C1 - Wet seal for butt joints - Google Patents

Abstract

FIELD: construction industry, sealing of butt joints welded in process of erection of various objects, for example, metal columns. SUBSTANCE: this invention can also find use in other fields for protection against corrosion, for reduction of heat loss, for protection against corrosive agents penetrating into structure at point of protected butt joint. Proposed wet seal comes in the form of electric heater placed by insulated point on thermosoftening material. Electric heater is manufactured in the form of zigzag bent conductor formed by wire bent over part of its length in the form of periodic curve and having free lengths for connection of source of electric power. Step of zigzag bent conductor is equal to 2.5-3.5 diameter of wire with amplitude of 5.0-25.0 mm. Zigzag bent conductor is fixed in configuration given to it with the aid of thermosoftening plastic tape which thickness amounts to 1.1-1.8 diameter of wire. Zigzag bent conductor includes parallel sections arranged along and transverse to its longitudinal axis or zigzag bent conductor has sections arranged in parallel, oriented sidewise to its longitudinal axis and interconnected by arc-shaped sections. Thermosoftening plastic tape has two layers, as minimum, and zigzag bent conductor is fixed between its layers. Tape with fixed zigzag bent conductor can be imparted with required configuration corresponding to form of insulated butt joint, for example, form of ring, spiral or figure with sections of concave-convex outline. Wet seal for butt joints in this case is section of specified length obtained by cutting tape coil into measured sections with subsequent employment of ends of zigzag bent conductor as free lengths for connection of power supply source. EFFECT: raised degree of sealing of welded joints, potential for their long service life and reliability. 6 cl, 2 dwg

Description

 The invention relates to the field of devices for waterproofing butt joints by sealing them, which is carried out during the construction of various objects in construction, for example, metal columns, as well as in other fields of technology - to prevent corrosion, reduce heat loss, and exclude aggressive agents from entering the structure at the site of the protected joint .

 A device for waterproofing butt joints, made in the form of a flat heater, placed in an insulated place between sheets of thermoplastic material formed of two parts joined in the area of the heater, and an induction type heater is used in the form of a embedded plate, and an inductor placed above it heating of the embedded plate and melting in the heating zone of the thermoplastic material with subsequent connection of its parts with each other (US patent 5481091, 1996).

 The closest known device is a device for waterproofing butt joints of structures made in the form of a flat heater placed at an insulated place on a thermoplastic sheet material formed of two parts overlapping in the area of the heater, the heater being made in the form of a rod formed in a spiral turns of a conductor connected to an electric current source (US Patent 5407514, 1995).

 Known devices do not provide a high degree of sealing of the connection of thermoplastic material due to the unevenness of its heating, which negatively affects the durability of the butt joint and the reliability of its protective functions.

 The objective of the present invention is to increase the degree of sealing of the joints, ensuring its durability and reliability.

 This is achieved by the fact that in the device for waterproofing butt joints of structures made in the form of an electric heater placed at an insulated place on a thermoplastic material, the electric heater is made in the form of a zigzag curved electric current conductor formed by at least a part of its length bent according to the shape of the periodic a curved wire with outlets at the ends to connect an electric current source, and the step of a zigzag bent conductor is 2.5-3.5 wire diameters At an amplitude of 5–25 mm, the zigzag bent conductor in the attached configuration is fixed with a thermoplastic polymer tape, the thickness of which is 1.1–1.8 times the diameter of the wire. In this case, a zigzag curved electric current conductor has parallel sections located along and / or across its longitudinal axis or a zigzag curved electric current conductor has sections parallel and oriented across its longitudinal axis, connected by arcuate sections. The thermoplastic polymer tape is made of at least two layers, and a zigzag curved conductor is fixed between its layers. The tape with a fixed zigzag conductor can be given the required configuration, corresponding to the shape of the waterproofing butt joint, for example in the form of a ring, spiral or figure with concave-convex sections. At the same time, the device for waterproofing butt joints of structures is a segment of a given length obtained by cutting the tape bay into measured segments, followed by using the ends of a zigzag bent conductor as outlets for connecting an electric current source.

The invention is illustrated by drawings, where
- figure 1 schematically shows a General view of a device for waterproofing butt joints of structures,
- figure 2 presents an embodiment of a section of a zigzag bent conductor.

 A device for waterproofing butt joints of structures is made in the form of an electric heater 1 placed at an insulated place on a thermoplastic material. The electric heater is made in the form of a zigzag curved conductor 2 of an electric current formed by curving at least part of its length in the form of a periodic curve by wire with outlets 3 at the ends to connect an electric current source. For this, a wire of high ohmic resistance, for example of nichrome, with a diameter of 0.5 mm to 5.0 mm, depending on the thickness of the thermoplastic material in an insulated place, can be used. The pitch “H” of the zigzag bent conductor is 2.5-3.5 diameters “d” of the wire with an amplitude “A” of the periodic curve of 5-25 mm. The zigzag bent conductor 2 in the configuration given to it is fixed with a thermoplastic polymer tape 4, the thickness of which is 1.1-1.8 wire diameters. The zigzag curved conductor 2 of the electric current has parallel sections 5 located along and / or across its longitudinal axis or has parallel sections located and oriented across its longitudinal axis, interconnected by arcuate sections 6 (figure 2). Thermoplastic polymer tape 4 is made of at least two layers, and a zigzag bent conductor 2 is fixed between its layers.

When operating the tape 4 with a fixed zigzag conductor 2, the required configuration can be given corresponding to the shape of the waterproofing butt joint, for example in the form of a ring, spiral or figure with concave-convex sections. At the same time, the device for waterproofing butt joints of structures is a segment of a given length, obtained by cutting a coil of tape with a conductor 2 into measured segments, followed by using the ends of a zigzag bent conductor as outlets for connecting an electric current source. The wrapped or laid tape 4 is evenly heated due to the heat generated by the conductor 2, is melted and, when a small (min. 0.5 kg / cm ² ) force is applied, reliably connects or seals the sections of the thermoplastic surface of the structure, which can be used for various construction constructions of various configurations, for example beams, pipes, including heat-insulated, etc.

 The use of this device can significantly reduce labor costs for waterproofing.

Claims (6)

 1. A device for waterproofing butt joints of structures made in the form of a flat electric heater placed at an insulated place on a thermoplastic sheet material, characterized in that the electric heater is made in the form of a zigzag curved electric current conductor, formed at least in part along its length along in the form of a periodic curve with a wire with outlets at the ends to connect an electric current source, and the step of a zigzag bent conductor is 2.5-3.5 dia wire frames at an amplitude of 5-25 mm, the zigzag bent wire attached to it in the locked configuration, the thermoplastic resin tape whose thickness is 1.1-1.8 wire diameter.  2. A device for waterproofing butt joints of structures according to claim 1, characterized in that the zigzag curved electric current conductor has parallel sections located along and / or across its longitudinal axis.  3. A device for waterproofing butt joints of structures according to claim 1, characterized in that the zigzag curved electric current conductor has sections parallel to each other and oriented across its longitudinal axis, connected by arcuate sections.  4. A device for waterproofing butt joints of structures according to claim 1, characterized in that the thermoplastic polymer tape is made of at least two layers, and a zigzag curved conductor is fixed between its layers.  5. A device for waterproofing butt joints of structures according to any one of paragraphs. 1-4, characterized in that the tape with a fixed zigzag curved conductor is given the desired configuration corresponding to the shape of the waterproofing butt joint, for example, in the form of a ring, spiral or figure with sections of concave-convex shape.  6. A device for waterproofing butt joints of structures according to any one of paragraphs. 1-5, characterized in that it is a segment of a predetermined length obtained by cutting the coil of the tape into measured segments, followed by using the ends of a zigzag bent conductor as outlets for connecting an electric current source.

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