Abrégé

A combined structural steel pipe with spiral corrugations on an outer wall. The combined structural steel pipe is formed by spirally rolling and welding a double-layer composite steel strip; and the double-layer composite steel strip comprises a first steel strip layer and a second steel strip layer, which are of equal width, staggered and fitted to each other, wherein the first steel strip layer is a corrugated steel strip; the second steel strip layer is a flat steel strip; in an axial extension direction in which a pipe body is formed, a side edge of the second steel strip layer is staggered from a side edge of the first steel strip layer; a fitting line of the first steel strip layer and the second steel strip layer is a welding seam between the two steel strip layers; the first steel strip layer serves as an outer pipe wall of the combined structural steel pipe; and the second steel strip layer serves as an inner pipe wall of the combined structural steel pipe. During a forming process, the corrugated steel strip is firstly rolled into a circle independently, such that the corrugated steel strip has a stable shape during a rolling process without curling, buckling or deformation; and the flat steel strip cannot be compressed circumferentially, remains flat and smooth, and is not prone to wavy deformation.

Classes IPC  ?

• B21C 37/12 - Fabrication de tubes ou de tuyaux métalliques à jonction hélicoïdale
• F16L 9/153 - Tubes en matériaux composites, c.-à-d. faits de matériaux non complètement couverts dans un seul des groupes précédents comportant uniquement des couches en métal et en béton avec ou sans renforcement
• F16L 9/16 - Tuyaux rigides faits d'enroulements de feuilles ou de bandes, avec ou sans armature
• B23P 15/00 - Fabrication d'objets déterminés par des opérations non couvertes par une seule autre sous-classe ou un groupe de la présente sous-classe

Abrégé

A continuous edge rolling device for a spiral welded steel pipe of a combined structure, comprising delivery mechanisms (4) and a spiral edge rolling mechanism (5). The spiral edge rolling mechanism comprises pilot rollers (501), a pressure roller (502), and an edge rolling roller (503) which are arranged at the rear portion of the delivery mechanisms. A first composite steel strip is delivered by the delivery mechanisms, sequentially passes through the pilot rollers, the pressure roller, and the edge rolling roller, and is formed by outward edge rolling of a vertical steel strip; a guide carrier roller (504) is arranged between the pilot rollers and the pressure roller; and a lower steel strip (2) is guided by the guide carrier roller to be fitted to the vertical steel strip of the first composite steel strip, and the fitted steel strip is formed by edge rolling by means of the pressure roller and the edge rolling roller. Also provided is a manufacturing method for a spiral welded steel pipe of a combined structure using the edge rolling device. By using the continuous edge rolling device and the manufacturing method, the lower steel strip does not need to be stretched during edge rolling, so that the power requirement of an assembly line is reduced; a welding bead between the lower steel strip and the vertical steel strip is not stretched and is not damaged; a welding seam of the lower steel strip and the vertical steel strip is located in the structure, and a spiral ridge of the steel pipe is not formed at the joint; and the welding seam of the outer wall is reduced, the strength of the pipe is guaranteed, and the pipe is attractive in appearance.

Classes IPC  ?

• B21C 37/12 - Fabrication de tubes ou de tuyaux métalliques à jonction hélicoïdale
• B21C 37/14 - Fabrication de tubes à partir d'éléments plats en double épaisseur
• F16L 9/04 - Tuyaux renforcés
• B23K 31/02 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux relatifs au brasage ou au soudage

Abrégé

A continuous production device for a spiral welded steel pipe of a combined structure, comprising a delivery mechanism, a spiral rolling mechanism, a guide carrier roller, and a welding mechanism. A first composite steel strip is delivered by the delivery mechanism; a vertical steel strip is rolled outwards into a round shape by the spiral rolling mechanism; the welding mechanism is used for welding a spiral joint between an upper steel strip that has just been rolled into a round shape and the previous section of steel strip which has become a pipe body; a lower steel strip is guided by a guide carrier roller to be attached to the vertical steel strip of the first composite steel strip that has passed through a pilot roller; and when the attachment point passes through a rounding press roller, the joint between the first composite steel strip and the lower steel strip is welded by means of the welding mechanism, achieving continuous spiral rolling and welding. The welding point between the first composite steel strip and the lower steel strip is located behind the rounding press roller, that is, behind a plastic deformation point of the first composite steel strip; in this case, the first composite steel strip has completed plastic deformation in the rolling process, and the lower steel strip does not need to be stretched when being rolled, thereby avoiding tensile deformation.

Classes IPC  ?

• B21C 37/12 - Fabrication de tubes ou de tuyaux métalliques à jonction hélicoïdale

Abrégé

It discloses a large-diameter spiral welded steel pipe with a composite structure wall, being formed by spirally roll-welding of a double-layer composite steel belt, where the double-layer composite steel belt comprises a first steel belt layer and a second steel belt layer that are disposed in parallel in a staggered manner with equal widths; at least two reinforcing ribs perpendicular to the first steel belt layer and the second steel belt layer are disposed there between and are arranged in a manner of extending together with the steel belt layers; and the reinforcing ribs are disposed on edges respectively between which the first steel belt layer and the second steel belt layer coincide in a vertical direction, and after spirally rolling, adjacent steel belt layers of the steel pipe are connected through staggered edges; and he present invention further discloses a method for manufacturing same.

Classes IPC  ?

• F16L 9/16 - Tuyaux rigides faits d'enroulements de feuilles ou de bandes, avec ou sans armature
• B21C 37/12 - Fabrication de tubes ou de tuyaux métalliques à jonction hélicoïdale

Abrégé

It discloses a large-diameter thin-wall spiral welded pipe, which is formed by spirally roll-welding of a double-layer composite steel belt; the double-layer composite steel belt comprises a first steel belt layer and a second steel belt layer that are arranged with equal widths in an aligned manner, the first steel belt layer is a corrugated steel belt, the second steel belt layer is a flat steel belt, and both side edges and each wave trough of the first steel belt layer are welded to the second steel belt layer to form the double-layer composite steel belt; it further discloses a method for manufacturing the large-diameter thin-wall spiral welded pipe. According to the present invention, the corrugated steel pipe completely wraps the internal flat-wall steel pipe, so that the whole structure can bear an external load uniformly and cooperatively.

Classes IPC  ?

• F16L 9/18 - Tuyaux à double paroiTuyaux à canaux multiples ou assemblages de tuyaux
• B23K 31/02 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux relatifs au brasage ou au soudage
• B23K 101/06 - Tubes
• B23K 101/10 - Pipe-lines
• B23K 103/04 - Alliages d'acier
• F16L 9/16 - Tuyaux rigides faits d'enroulements de feuilles ou de bandes, avec ou sans armature

Abrégé

Disclosed are a large-diameter thin-walled spiral welded pipe and a manufacturing method therefor. The large-diameter thin-walled welded pipe is formed by spiral roll-welding of a double-layer composite steel strip that comprises a first steel strip layer (1) and a second steel strip layer (2), which have equal widths and are aligned, wherein the first steel strip layer (1) is a corrugated steel strip, the second steel strip layer (2) is a flat steel strip, and the first steel strip layer (1) is welded to the second steel strip layer (2) on both sides and at each trough of corrugation so as to form the double-layer composite steel strip. The corrugated steel pipe fully wraps around the internal flat-walled steel pipe, so that the entire structure can uniformly and cooperatively bear external loads.

Classes IPC  ?

• F16L 9/16 - Tuyaux rigides faits d'enroulements de feuilles ou de bandes, avec ou sans armature
• B23P 15/00 - Fabrication d'objets déterminés par des opérations non couvertes par une seule autre sous-classe ou un groupe de la présente sous-classe
• B23K 101/06 - Tubes

Abrégé

Disclosed are a large-diameter spirally welded steel pipe with a composite structural wall, and a manufacturing method therefor. The steel pipe is formed by spirally rolling and welding a double-layer composite steel strip comprising a first steel strip layer (1) and a second steel strip layer (2) which are equal in width and are arranged in parallel and in a staggered manner, wherein at least two reinforcing ribs (3) which are perpendicular to the first steel strip layer (1) and the second steel strip layer (2) are arranged therebetween, and jointly extend with the steel strip layers; reinforcing ribs (3) are respectively arranged at vertically overlapped edges of the first steel strip layer (1) and the second steel strip layer (2); and after spiral rolling, the adjacent steel strip layers of the steel pipe are connected to each other by means of the staggered edges. Weld joints in an inner pipe wall and an outer wall wall of the spirally welded steel pipe do not coincide with each other, so that stress concentration is avoided, the strength of the steel pipe is improved, materials are saved during manufacturing, and the rolling power requirement is low.

Classes IPC  ?

• F16L 9/16 - Tuyaux rigides faits d'enroulements de feuilles ou de bandes, avec ou sans armature
• B23K 31/02 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux relatifs au brasage ou au soudage