Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
  • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
  • B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
  • B23K37/0533—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor external pipe alignment clamps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
  • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
  • F16L1/06—Accessories therefor, e.g. anchors
  • F16L1/10—Accessories therefor, e.g. anchors for aligning
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
  • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
  • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
  • F16L1/038—Laying or reclaiming pipes on land, e.g. above the ground in the ground the pipes being made in situ
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
  • F16L13/02—Welded joints
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/04—Tubular or hollow articles
  • B23K2101/06—Tubes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/02—Iron or ferrous alloys
  • B23K2103/04—Steel or steel alloys

Definitions

• the present invention relates to a construction method of a steel pipe
• a steel pipe has been used for a line pipe, an oil pipeline, a
• the steel pipe there are a roll bending method and a spiral method.
• a steel pipe is bent with a circular cross section using a plurality of rolls, and the abutting ends of the steel pipes are welded in the direction of a centerline.
• the steel pipe is wound in a spiral shape using a belt steel and is welded, while twisting the same.
• the spiral method in the fabrication method of the steel pipe has a thin plate material, and a mass production is made easier. However, in the case that the steel pipe is thick, accuracy is decreased during the fabrication. Therefore,
• allowable error has a range of ⁇ 0.5% of a circular surrounding length based on
• the error is more increased at the upper portion of the steel pipe due to the
• the steel pipes are constructed using a socket joint type at the construction site of the steel pipes, it is needed to insert the other end of the neighboring steel pipe into the socket of one end of the steel pipe, so that it is impossible to achieve a proper insertion because of the deformed cross section shape of the steel pipe.
• a certain wedge is inserted into the portion that is not inserted due to the deformed shape to have a certain perfect circle in a state that the other end of the neighboring steel pipe is suspended at the socket of an end of the steel pipe and is stroke.
• a turnbuckle or a chain block is inserted at an inner surface of
• steel pipes are arranged in a straight line shape, and the ends of the steel pipes
• each steel pipe P aligned in the aligning step and the ends of the steel pipes P are pressurized using the shaper 10 in a radial direction in the direction of the center for thereby adjusting and maintaining the perfect circle shape; a matching step in which the end circumferential surfaces of the steel pipes P are abutted and inserted into a socket PS in a state that the steel pipes P are maintained in a straight line shape after the perfect circle formation step; and a welding step in which the conjunction portions of the inner or outer surface of
• the neighboring steel pipes P matched by the matching step are welded.
• the pressurizing is performed
• the perfect circle may be achieved by a method of concurrently
• pressurizing is performed in the direction of the center at one side, and the
• pressurizing is performed in the direction from the center of the steel pipes to
• the pulling unit of the matching step may be integral with the shaper
• the conjunction portions of the inner surface of the steel pipes are welded using a welding robot or a track-moving welding robot capable of welding wherein only welding device is rotated in a state that it is moved along the longitudinal (center) direction in the interior of the steel pipes and is rotated in a stopped state.
• the conjunction portions of the outer surface of the steel pipes can be welded using a welding robot separately provided at an outer surface of the end
• Figure 1 is a schematic view illustrating a back hoe and a state that a
• shaper is installed at an arm for a back hoe for thereby achieving a construction
• Figure 2 is a front view illustrating parts of a shaper of Figure 1 ;
• Figure 3 is a side view of Figure 2;
• Figure 4 is a perspective view illustrating a welding robot for a
• Figure 5 is a view of a construction method of a steel pipe according to
• Figures 6A through 6F are views illustrating each process in a construction method of a steel pipe according to the present invention.
• Figure 1 is a schematic view illustrating a back hoe and a state that a
• shaper is installed at an arm for a back hoe for thereby achieving a construction
• Figure 2 is a front
• Figure 3 is a side view of Figure 2
• FIG. 4 is a perspective view illustrating a welding robot for a conjunction
• a shaper 10 is installed at an end of a work arm R of
• BH back hoe
• the shaper 10 is installed at each end of
• the shaper 10 is rotated about an axis 13 of one side of the
• bodies 11 and 12 are opened and closed by an opening and closing cylinder 14.
• a locking apparatus 15 in order to prevent the bodies 11 and 12 from being widened when it is formed in a circular shape because the ends of the semicircular bodies 11 and 12 are abutted.
• a plurality of pressurizing cylinders 16 are provided in a radial shape at the semicircular bodies 11 and 12 in order to concurrently or individually pressurize the same in the direction of the center.
• the pulling unit 20 is provided in a form of a unit together with a pair of
• the pulling unit 20 may be formed of a hydraulic pulling cylinder.
• pulling cylinders are installed at the regular angle at the semicircular bodies 11
• the pulling unit 20 is provided in the form of
• the pulling unit 20 may be provided in a type of turnbuckle or chain
• the welding device is adapted to weld the conjunction
• the welding device may be provided in various types, but welding robots 30a
• the conjunction portions of the inner surfaces of the steel pipes P are preferably welded using the welding robot in order to prevent a suffocation accident or electric shock accident in the closed inner spaces of the steel pipes P.
• the welding robot 30a adapted to weld the conjunction portions of the inner surface of the steel pipe is preferably installed in the interior of the steel pipe P. As shown in Figure 4, the welding robot 30a includes a driving unit for moving along a longitudinal direction of the steel pipe P and a setting unit
• the welding robot 37 adapted to weld the conjunction portions of the
• robot 30b is integral with a semicircular guide rail 32 at one side of the
• shaper 10 of one side includes a guide rail 32.
• the welding device 33 performs
• small driving error with a self-driven unit may be preferably adapted.
• welding robot 30b is installed at the shaper 10 of the outer surface of the steel
• P are 6m 9m and 12m fabricated based on the roll bending method or spiral
• a shaper 10 is installed at the end portions of the steel pipes, and a welding
• the shaper 10 is installed at the ends of the steel pipes P that are arranged in the aligning process, and the steel pipes P are pressurized in the radial direction from the inner and outer sides of
• the shaper 10 is engaged at the end of the work
• the pressurizing cylinders 16 can be selectively operated.
• the pressurizing may be performed in the radial direction from the inner side of
• the steel pipes P are preferably matched in the
• the shape 10 is disassembled and moved in the direction of
• the excavating work is performed at the construction site, and the neighboring steel pipes are roughly arranged, and the ends of the neighboring steel pipes are held and pressurized in the radial shape
• a plurality of hydraulic are provided at the

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Butt Welding And Welding Of Specific Article (AREA)
• Piles And Underground Anchors (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=34709221

Family Applications (1)

Country Status (3)

Cited By (6)

Families Citing this family (9)

Citations (4)

Family Cites Families (5)

• 2003
  • 2003-12-10 KR KR1020030089657A patent/KR100440555B1/ko active IP Right Grant
• 2004
  • 2004-12-10 WO PCT/KR2004/003236 patent/WO2005061936A1/en active Application Filing
  • 2004-12-10 CN CNB2004800346682A patent/CN100458253C/zh not_active Expired - Fee Related

Patent Citations (4)

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