Spiral steel pipe

Abstract

The utility model relates to the field of steel pipes, in particular to a spiral steel pipe, which aims to solve the technical problem that the spiral steel pipe in the prior art is easy to open and leak when bearing larger load due to welding forming, and comprises a spiral outer pipe, a welding seam of the spiral outer pipe is filled by welding materials, and holes are arranged on two sides of the welding seam of the spiral outer pipe. A seamless anti-corrosion steel pipe is sleeved with the spiral outer pipe, a fixed threaded rod is connected to the anti-corrosion steel pipe and penetrates through holes in the two sides of a weld joint of the spiral outer pipe, a nut is screwed on the upper portion of the fixed threaded rod and makes contact with the outer surface of the spiral outer pipe, and corrosion prevention and supporting are achieved in the spiral steel pipe through the seamless anti-corrosion steel pipe. The seamless anti-corrosion steel pipe and the spiral steel pipe are fixed through cooperation of the fixing threaded rod and the nut, the fixing threaded rod and the nut are located on the two sides of a welding seam, the strength of the welding position is enhanced, the sealing rings at the two ends of the seamless anti-corrosion steel pipe seal the seam of the spiral outer pipe, and the inner wall of the spiral outer pipe is prevented from being corroded.

Description

Technical Field

[0001] The utility model relates to the field of steel pipes, in particular to a spiral steel pipe. Background Art

[0002] Spiral steel pipe is a long hollow steel product. Its manufacturing process involves rolling the strip or steel plate into a spiral shape, and then welding the spiral seam together through automatic double-wire double-sided submerged arc welding technology to form a continuous steel pipe. Spiral steel pipe has been widely used in the oil, gas, chemical, construction, water conservancy, electricity, bridges, ships, machinery manufacturing and other industries due to its unique production process and structural characteristics;

[0003] The spiral steel pipe in the prior art is welded and is prone to open welding and leakage when subjected to a large load. The utility model solves the above problem. Utility Model Content

[0004] The utility model provides a spiral steel pipe to solve the technical problem that the spiral steel pipe in the prior art is easy to open and leak when subjected to a large load due to welding.

[0005] A spiral steel pipe includes: a spiral outer pipe, the weld of the spiral outer pipe is filled with welding material, holes are opened on both sides of the weld of the spiral outer pipe, a seamless anti-corrosion steel pipe is sleeved inside the spiral outer pipe, a fixed threaded rod is connected to the seamless anti-corrosion steel pipe, the fixed threaded rod passes through the holes on both sides of the weld of the spiral outer pipe, a nut is tightened on the upper part of the fixed threaded rod, and the nut is in contact with the outer surface of the spiral outer pipe.

[0006] Furthermore, a protrusion is connected to the inner wall of the seamless anti-corrosion steel pipe, the position of the protrusion corresponds to the hole of the seamless anti-corrosion steel pipe, threaded holes are opened on the protrusion and the seamless anti-corrosion steel pipe, threads are provided at both ends of the fixed threaded rod, and the lower end of the fixed threaded rod is threadedly connected to the threaded hole of the protrusion and the seamless anti-corrosion steel pipe.

[0007] Furthermore, both ends of the seamless anti-corrosion steel pipe are provided with rubber strip grooves, and sealing rings are sleeved in the rubber strip grooves. The sealing rings can seal the joints between the spiral outer tube and the two ends of the seamless anti-corrosion steel pipe.

[0008] Beneficial effects of the utility model:

[0009] 1. The interior of the spiral steel pipe is protected from corrosion and supported by seamless anti-corrosion steel pipes. The seamless anti-corrosion steel pipes are fixed to the spiral steel pipes by fixing threaded rods and nuts. The fixed threaded rods and nuts are located on both sides of the weld, which also enhances the strength of the weld.

[0010] 2. The sealing rings at both ends of the seamless anti-corrosion steel pipe seal the joints of the spiral outer tube to prevent corrosion of the inner wall of the spiral outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the structural section of the utility model;

[0013] Figure 3 This utility model Figure 2 Structural diagram.

[0014] In the figure: spiral outer tube 1; welding material 2; seamless anti-corrosion steel pipe 3; fixed threaded rod 4; nut 5; protrusion 6; sealing ring 7. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] The rotational connection described in this device refers to the process of baking the bearing on the shaft, providing a spring retaining ring groove on the shaft or the shaft hole, and clamping the elastic retaining ring in the retaining ring groove to achieve axial fixation of the bearing and realize rotation; the articulation refers to a connection method that is active on connecting parts such as hinges, pins and short shafts.

[0017] The present invention will be described in detail below with reference to the accompanying drawings.

[0018] Embodiment 1:

[0019] The following is combined with Figure 1 -Description of a spiral steel pipe according to the present embodiment, comprising: a spiral outer pipe 1, the weld of the spiral outer pipe 1 is filled with welding material 2, holes are provided on both sides of the weld of the spiral outer pipe 1, a seamless anti-corrosion steel pipe 3 is sleeved inside the spiral outer pipe 1, a fixed threaded rod 4 is connected to the seamless anti-corrosion steel pipe 3, the fixed threaded rod 4 passes through the holes on both sides of the weld of the spiral outer pipe 1, a nut 5 is tightened on the upper part of the fixed threaded rod 4, and the nut 5 is in contact with the outer surface of the spiral outer pipe 1;

[0020] The interior of the spiral steel pipe 1 is protected from corrosion and supported by a seamless anti-corrosion steel pipe 3, and the seamless anti-corrosion steel pipe is fixed to the spiral steel pipe 1 by the cooperation of a fixed threaded rod 4 and a nut 5, and the fixed threaded rod 4 and the nut 5 are located on both sides of the weld, which also enhances the strength of the weld.

[0021] The inner wall of the seamless anti-corrosion steel pipe 3 is connected with a protrusion 6, the position of the protrusion 6 corresponds to the hole of the seamless anti-corrosion steel pipe 3, the protrusion 6 and the seamless anti-corrosion steel pipe 3 are provided with threaded holes, both ends of the fixed threaded rod 4 are provided with threads, and the lower end of the fixed threaded rod 4 is threadedly connected to the protrusion 6 and the threaded hole of the seamless anti-corrosion steel pipe 3;

[0022] During installation, first screw the fixed threaded rod 4 into the threaded holes of the protrusion 6 and the seamless anti-corrosion steel pipe 3, and then turn the nut 5 and tighten it. The tightening direction of the fixed threaded rod 4 is consistent with the tightening direction of the nut 5 and will not loosen.

[0023] Both ends of the seamless anti-corrosion steel pipe 3 are provided with rubber strip grooves, and sealing rings 7 are sleeved in the rubber strip grooves. The sealing rings 7 can seal the joints between the spiral outer tube 1 and the two ends of the seamless anti-corrosion steel pipe 3;

[0024] The sealing rings 7 at both ends of the seamless anti-corrosion steel pipe 3 seal the joints of the spiral outer pipe 1 to prevent the inner wall of the spiral outer pipe 1 from being corroded.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spiral steel pipe, characterized in that: include: A spiral outer tube (1), the weld of the spiral outer tube (1) is filled with welding material (2), holes are opened on both sides of the weld of the spiral outer tube (1), a seamless anti-corrosion steel pipe (3) is sleeved inside the spiral outer tube (1), a fixed threaded rod (4) is connected to the seamless anti-corrosion steel pipe (3), the fixed threaded rod (4) passes through the holes on both sides of the weld of the spiral outer tube (1), a nut (5) is tightened on the upper part of the fixed threaded rod (4), and the nut (5) is in contact with the outer surface of the spiral outer tube (1).

2. A spiral steel pipe according to claim 1, characterized in that: The inner wall of the seamless anti-corrosion steel pipe (3) is connected with a protrusion (6), the position of the protrusion (6) corresponds to the hole of the anti-corrosion steel pipe (3), threaded holes are opened on the protrusion (6) and the seamless anti-corrosion steel pipe (3), both ends of the fixed threaded rod (4) are provided with threads, and the lower end of the fixed threaded rod (4) is threadedly connected to the threaded holes of the protrusion (6) and the seamless anti-corrosion steel pipe (3).

3. A spiral steel pipe according to claim 1, characterized in that: Both ends of the seamless anti-corrosion steel pipe (3) are provided with rubber strip grooves, and sealing rings (7) are sleeved in the rubber strip grooves. The sealing rings (7) can seal the joints between the spiral outer pipe (1) and the seamless anti-corrosion steel pipe (3) at both ends.

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