Combined structural steel pipe with spiral corrugations on outer wall, and manufacturing apparatus and method

Abstract

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.

Description

Combined structure steel pipe with spiral corrugated outer wall and manufacturing equipment and method TECHNICAL FIELD

[0001] The present application relates to the field of water conveying steel pipes and production technology, in particular to a combined structure steel pipe with spiral corrugated outer wall and manufacturing equipment and method. BACKGROUND

[0002] The applicant has previously applied for a patent application with application number 2022111502754 and the name of a large-diameter thin-wall spiral welded pipe and its manufacturing method, the main scheme of which is that the pipe wall of the steel pipe is welded into a composite steel strip after the double-layer steel pipe, and then the spiral seam is welded by spiral forming and welding, wherein the inner wall of the double-layer pipe wall is a flat steel strip, and the outer wall is a corrugated steel strip. The two steel strips are of equal width, the side edges of the two layers of steel strips are welded after being attached, the contact lines of the corrugated steel strip and the flat steel strip are welded (using fusion welding or penetration welding), the composite steel strip is formed, and then it is sent to a special spiral forming and welding equipment for forming and welding the spiral seam.

[0003] The above structure and manufacturing method have the following problems in actual test process:

[0004] Firstly, for the structure of the product, the welding of the spiral weld is to weld the two side edges of the equal-width aligned composite steel strip, and the two side edges are the primary welds after the inner and outer steel strips are welded once. The spiral weld is the secondary welding of the two primary welds. Due to the welding deformation of the primary weld after welding and the difference in weld shape, the welding quality is unstable during secondary welding, the surface quality is poor, and there are pores and water leakage. In addition, from the structure, the three welds are concentrated and overlapped together, forming stress concentration, which affects the structural quality of the steel pipe.

[0005] In addition, in terms of manufacturing, the contact seam of the inner and outer steel strips is welded as a whole, and the cross section forms multiple independent cavities. During forming, the outer wall of the cavity is stretched, and the inner wall is contracted. The inner wall is prone to buckling deformation and wrinkling, especially when the wave height is high and the inner wall is thin. If an anti-buckling and anti-deformation lining is provided in the cavity to assist in forming, the friction force generated by the lining rod is too large, the steel strip is difficult to deliver, and in addition, the shape of these non-standard cavities is not like the bending of a circular steel pipe elbow, which has a circular lining in the pipe to prevent deformation during bending of the steel pipe. The bending of the steel pipe and the lining rod in the pipe are shown in FIG. 8. The non-standard cavity has two narrow gaps, making it difficult to set an anti-deformation lining to assist in forming. During the forming process, the weld between the inner and outer wall steel strips at the wave crest is the most severely contracted, making the inner wall prone to wavy deformation and unevenness.

[0006] SUMMARY

[0007] The present application aims to overcome the deficiencies of the prior art.

[0008] The first object is to disclose a combined structure steel pipe with spiral corrugated outer wall.

[0009] The second object is to disclose a manufacturing device for the combined structure steel pipe with spiral corrugated outer wall.

[0010] The third object is to disclose a manufacturing method for the combined structure steel pipe with spiral corrugated outer wall.

[0011] Technical scheme: The combined structure steel pipe with spiral corrugated outer wall disclosed by the present application is formed by spiral coiling and 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 which are of equal width, staggered and attached; the first steel belt layer is a corrugated steel belt, the second steel belt layer is a flat steel belt, the side edges of the second steel belt layer are staggered with the side edges of the first steel belt layer in the axial elongation direction of the pipe body, the attachment line of the first steel belt layer and the second steel belt layer is the weld joint between the two layers of steel belts, and the first steel belt layer is the outer pipe wall of the steel pipe.

[0012] Further, the spiral weld joints between the second steel belt layers are located at the wave crests of the first steel belt layer and are integrated with the wave crests by welding.

[0013] Further, the spiral joints between the first steel belt layers are located at the waists of the corrugations.

[0014] Further, the spiral joints between the first steel belt layers are weld joints after the overlap is closed.

[0015] Further, the cavities between the first steel belt layer and the second steel belt layer are filled with concrete or mortar.

[0016] Further, shear studs are arranged in the cavities.

[0017] The manufacturing device for the combined structure steel pipe with spiral corrugated outer wall comprises a delivery roller, a guide roller, a coiling roller, a coiling roller and a pressing and attaching roller.

[0018] The first steel belt layer sequentially passes through the delivery roller, the guide roller, the coiling roller and the coiling roller to be coiled and formed, and a first welding mechanism for welding the joint between the corrugated steel belt and the corrugated steel belt which has been formed into a pipe body is arranged behind the coiling roller; the first welding mechanism is located inside the pipe body contour.

[0019] The pressing roller is located behind the round pressing roller, the second steel strip layer is pressed on the first steel strip layer just passing through the round pressing roller by the pressing roller after being unwound by the unwinding machine, and a second welding mechanism for welding the joint line of the first steel strip layer and the second steel strip layer is arranged, the second welding mechanism is a penetrating welding machine such as a laser self-fusion welding, and a third welding mechanism for welding the outer spiral seam between the first steel strip layers is arranged on the top outside of the pipe body.

[0020] Further, the first steel strip layer is the outer pipe wall of the steel pipe, and the pressing roller is located inside the profile of the spiral corrugated steel pipe body being rolled.

[0021] Further, the second welding mechanism is arranged at a circumferential interval corresponding to adjacent waveforms, and a pressing roller is arranged at each welding position.

[0022] Further, a third welding mechanism for welding the outer spiral seam between the first steel strip layers is arranged on the top of the pipe body.

[0023] Further, the guide roller, the round pressing roller and the round rolling roller are all composed of a plurality of adjustable angle rollers, the outer dimensions of the rollers match the wave dimension of the first steel strip layer.

[0024] The manufacturing method of the combined structure steel pipe with an outer wall having a spiral corrugation comprises the following steps:

[0025] S1, a corrugated steel strip, i.e. the first steel strip layer, is prepared, and the first steel strip layer is delivered to a round rolling device;

[0026] S2, after the corrugated steel strip passes through the round pressing roller, a first welding mechanism is used to weld the inner pipe joint between the corrugated steel strip and the corrugated steel strip which has been formed into a pipe body;

[0027] S3, a flat steel strip, i.e. the second steel strip layer, is unwound behind the round pressing roller and pressed on the first steel strip layer just passing through the round pressing roller by the pressing roller, when pressing, the second steel strip layer is translated to the pipe body forming length direction, so that the side edge of the second steel strip layer is staggered with the side edge of the first steel strip layer, and the inner spiral seam between the first steel strip layers just completed by the round rolling and welding is covered;

[0028] S4, a second welding mechanism is used to weld the joint line of the first steel strip layer and the second steel strip layer;

[0029] S5, a third welding mechanism is used to weld the outer spiral seam between the first steel strip layers on the top outside of the pipe body.

[0030] Advantages: compared with the prior art, the advantages of the present application are:

[0031] 1. The combined structure pipe body has good circumferential stiffness and improved axial strength, and the wave height of the corrugation improves the moment of inertia of the longitudinal section of the pipe wall of the pipe body;

[0032] 2. The pipe body has smooth inner wall and small flow resistance;

[0033] 3. The combined structure pipe body has improved ability to withstand internal water pressure;

[0034] 4. The pipe body avoids overlapping of the spiral welds and stress concentration of the welds;

[0035] 5. The pipe body is light and convenient for construction;

[0036] 6. The corrugated steel strip is first separately formed into a circle, so that the corrugated steel strip is stable in shape during the forming process and is not buckled or deformed;

[0037] 7. During the forming process, the inner wall (flat steel strip) is not circumferentially compressed and is flat and smooth, and is not prone to wavy deformation;

[0038] 8. The inner wall welds and the outer wall welds are staggered, so that stress concentration of the welds is avoided, and the inner wall welds and the outer wall welds are staggered, so that overlapping is not formed and the weld quality is controllable;

[0039] 9. The seams between the inner walls are formed into a three-in-one weld at the wave peaks, so that the strength is high, and the wave peaks function as a welding backing pad, which is conducive to alignment of the inner wall steel strip seams and improvement of the weld quality;

[0040] 10. The welds between the corrugated steel strips are arranged at the wave waists and not at the wave tops, so that overlapping of the welds and the penetrating welds between the inner wall steel strips is avoided;

[0041] 11. The corrugated seams arranged at the wave waists are first connected by a bite, so that the wave side edges are not affected by the lotus leaf edges during the forming and coiling, and the bite increases the strength of the seams;

[0042] 12. The corrugated steel strip with high wave height and thin thickness can be coiled, the pipe body with thin inner wall can be produced, and the thin inner wall is not deformed;

[0043] 13. After the inner wall steel strip is staggered to the elongation direction of the pipe body, the key setting space is left for the coiling of the wave side edges of the corrugated steel strip and the welding process of the spiral seams between the corrugated steel strips;

[0044] 14. After the spiral cavity between the inner and outer pipe walls is filled with concrete, the pipe body forms a combined structure, the concrete and the pipe wall are mutually reinforced, the ring stiffness of the pipe body is increased, the material usage is reduced, and the concrete can transmit force between the inner and outer pipe walls, so that the pipe body can withstand large internal pressure and large external pressure, and in particular, the thickness of the inner wall can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0045] Fig. 1 is a schematic view of a cross-sectional structure of a double-layer composite steel strip according to the present application;

[0046] Figure 2 is a schematic view of the spiral joint between the first steel strip layer and the wave-shaped waist;

[0047] Figure 3 is a structural view of the manufacturing equipment of the present application;

[0048] Figure 4 is a sectional view of the delivery roller of the present application;

[0049] Figure 5 is a top view of the contact position between the rounding roller and the first steel strip layer of the present application;

[0050] Figure 6 is a sectional view of the pressing roller of the present application;

[0051] Figure 7 is a schematic view of the pipe body forming structure of the present application;

[0052] Figure 8 is a schematic view of the pipe bending and the pipe lining mandrel in the background art. DETAILED DESCRIPTION

[0053] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0054] A combined structure steel pipe with an outer wall having spiral corrugations is formed by spirally rounding and welding a double-layer parallel composite steel strip.

[0055] As shown in Figure 1, the double-layer composite steel strip includes a first steel strip layer 1 and a second steel strip layer 2 which are of equal width, staggered and attached, the first steel strip layer 1 is a wave-shaped steel strip, the second steel strip layer 2 is a flat steel strip, the side edges of the second steel strip layer 2 are staggered with the side edges of the first steel strip layer 1 in the axial elongation direction of the pipe body forming, the attachment line of the first steel strip layer 1 and the second steel strip layer 2 is the weld joint between the two steel strip layers, and the first steel strip layer 1 is the outer pipe wall of the steel pipe.

[0056] The spiral weld joints between the second steel strip layers 2 are located at the wave crests of the first steel strip layer 1 and are integrally welded with the wave crests.

[0057] As shown in Figure 2, the spiral joints between the first steel strip layers 1 are located at the waists of the waves and are the weld joints after the overlap.

[0058] The cavities between the first steel strip layer 1 and the second steel strip layer 2 are filled with concrete or mortar, and shear studs are arranged in the cavities.

[0059] The present application also provides the manufacturing equipment of the above-mentioned combined structure steel pipe with an outer wall having spiral corrugations, as shown in Figures 3 and 4, which includes a delivery roller 3, a guide roller 4, a rounding roller 5, a rounding roller 6 and a pressing roller 7.

[0060] The first steel strip layer 1 sequentially passes through a delivery roller 3, a guide roller 4, a rounding roller 5, and a coiling roller 6 to be coiled into a shape, and a first welding mechanism 8 for welding a joint between the corrugated steel strip and the corrugated steel strip which has been formed into a pipe body is arranged behind the rounding roller 5, and the first welding mechanism 8 is located inside the profile of the pipe body; the pressing roller 7 is located behind the rounding roller 5, the second steel strip layer 2 is pressed onto the first steel strip layer 1 which has just passed through the rounding roller 5 by the pressing roller 7 after being unwound by an unwinding machine, and a second welding mechanism 9 for welding the joint line between the first steel strip layer 1 and the second steel strip layer 2 is arranged, and the second welding mechanism 9 is a through-type welding machine such as a laser self-fusion welding machine, and a third welding mechanism 10 for welding an outer spiral joint between the first steel strip layers 1 is arranged on the outside of the top of the pipe body.

[0061] Since the first steel strip layer 1 is the outer pipe wall of the steel pipe, the pressing roller 7 is located inside the profile of the spiral corrugated steel pipe which is being coiled.

[0062] The second welding mechanism 9 is arranged in a circumferential interval corresponding to adjacent corrugations, and a pressing roller 7 is arranged at each welding position.

[0063] The third welding mechanism 10 for welding the outer spiral joint between the first steel strip layers 1 is arranged on the top of the pipe body.

[0064] The guide roller 4, the rounding roller 5, and the coiling roller 6 are each composed of a plurality of adjustable angle rollers, and the outer dimensions of the rollers match the corrugation dimensions of the first steel strip layer 1. As shown in FIG. 5, the wheel center lines of the rollers are parallel to the axial center line of the pipe body.

[0065] The manufacturing method of the manufacturing equipment for the combined structure steel pipe with the outer wall having spiral corrugations comprises the following steps:

[0066] S1, preparing a corrugated steel strip, i.e. the first steel strip layer 1, and delivering the first steel strip layer 1 to a coiling equipment;

[0067] S2, immediately after the corrugated steel strip passes through the rounding roller 5, welding the inner joint between the corrugated steel strip and the corrugated steel strip which has been formed into a pipe body by using the first welding mechanism 8;

[0068] S3, unwinding a flat steel strip, i.e. the second steel strip layer 2, behind the rounding roller 5, and pressing the second steel strip layer 2 onto the first steel strip layer 1 which has just passed through the rounding roller 5 by the pressing roller 7, and during the pressing, the second steel strip layer 2 is translated in the elongation direction of the pipe body forming length, so that the side edges of the second steel strip layer 2 are staggered with the side edges of the first steel strip layer 1, and the second steel strip layer 2 covers the inner spiral joint between the first steel strip layers 1 which have just completed coiling and welding;

[0069] S4, welding the joint line between the first steel strip layer 1 and the second steel strip layer 2 by using the second welding mechanism 9;

[0070] S5, welding the outer spiral seam between the first steel belt layers 1 with the third welding mechanism 10 outside the top of the pipe body, as shown in Figures 6 and 7.

Claims

1. A composite structural steel pipe having an outer wall with helical corrugations, characterized in that: The double-layer composite steel belt is spirally coiled and welded to form; the double-layer composite steel belt comprises first steel belt layer (1) and second steel belt layer (2) which are of equal width, staggered and attached; the first steel belt layer (1) is corrugated steel belt, the second steel belt layer (2) is flat steel belt, the side edge of the second steel belt layer (2) is staggered with the side edge of the first steel belt layer (1) in the axial elongation direction of the pipe body forming, the attachment line of the first steel belt layer (1) and the second steel belt layer (2) is the weld between the two layers of steel belt, and the first steel belt layer (1) is the outer pipe wall of the steel pipe.

2. The composite steel pipe with external wall having helical corrugation according to claim 1, characterized in that: The spiral weld seams between the second steel belt layers (2) are located at the wave crests of the first steel belt layer (1) and are integrated with the wave crests by welding.

3. The composite steel pipe with external wall having helical corrugation according to claim 1, characterized in that: The spiral seams between the first steel belt layers (1) are located at the waists of the corrugations.

4. The composite steel pipe with external wall having helical corrugation according to claim 3, characterized in that: The spiral seams between the first steel belt layers (1) are weld seams after the edges are overlapped.

5. The composite steel pipe with external wall having helical corrugation according to claim 1, characterized in that: The cavities between the first steel belt layers (1) and the second steel belt layers (2) are filled with concrete or mortar.

6. The composite steel pipe with external wall having helical corrugation according to claim 5, characterized in that: Shear studs are arranged in the cavities.

7. The apparatus for manufacturing the combined structural steel pipe having the spiral corrugated outer wall according to claim 1, wherein The delivery roller (3), the guide roller (4), the coiling roller (5), the coiling roller (6) and the pressing and attaching roller (7) are included. The first steel belt layer (1) sequentially passes through the delivery roller (3), the guide roller (4), the coiling roller (5), the coiling roller (6) to be coiled and formed, a first welding mechanism (8) for welding the joint between the corrugated steel belt and the corrugated steel belt which has been formed into a pipe body is arranged behind the coiling roller (5), and the first welding mechanism (8) is located inside the pipe body contour. The pressing and attaching roller (7) is located behind the coiling roller (5), the second steel belt layer (2) is pressed and attached to the first steel belt layer (1) which has just passed through the coiling roller (5) after being unwound by the unwinding machine, a second welding mechanism (9) for welding the attachment line of the first steel belt layer (1) and the second steel belt layer (2) is arranged, and a third welding mechanism (10) for welding the outer spiral seams between the first steel belt layers (1) is arranged on the top outside of the pipe body.

8. The apparatus according to claim 7, wherein the outer wall of the composite steel pipe is provided with a spiral corrugation. The first steel belt layer (1) is the outer pipe wall of the steel pipe, and the pressing and attaching roller (7) is located inside the contour of the spiral corrugated steel pipe which is being coiled.

9. The apparatus according to claim 7, wherein the outer wall of the composite steel pipe is provided with a spiral corrugation. The second welding mechanism (9) is arranged in a circumferential interval corresponding to adjacent corrugations, and a pressing and attaching roller (7) is arranged at each welding position.

10. The apparatus according to claim 7, wherein the outer wall of the composite steel pipe with spiral corrugation is characterized in that: A third welding mechanism (10) for welding the outer spiral seams between the first steel belt layers (1) is arranged on the top of the pipe body.

11. The manufacturing equipment for composite structural steel pipe with spiral corrugations on the outer wall according to claim 7, characterized in that: The guide roller (4), the coiling roller (5) and the coiling roller (6) are each composed of a plurality of adjustable angle rollers, the outer dimensions of the rollers match the corrugation dimensions of the first steel belt layer (1).

12. A method of manufacturing an apparatus for manufacturing a composite steel pipe having a spiral corrugation on an outer wall according to claim 7, characterized by, The method comprises the following steps: S1, preparing a corrugated steel belt, i.e. the first steel belt layer (1), and delivering the first steel belt layer (1) to a coiling device; S2, immediately after the corrugated steel belt passes through the coiling roller (5), welding the inner joint between the corrugated steel belt and the corrugated steel belt which has been formed into a pipe body by using the first welding mechanism (8); S3, after the round roller (5) behind the release flat steel strip, that is, the second steel strip layer (2), is pressed to the first steel strip layer (1) just through the round roller (5) by the pressing roller (7), and when pressing, the second steel strip layer (2) is translated to the pipe body forming length extension direction, so that the side edge of the second steel strip layer (2) is staggered with the side edge of the first steel strip layer (1), and covers the pipe inner spiral joint between the first steel strip layer (1) just completed round and welding; S4, the second welding mechanism (9) is used for welding the joint line of the first steel strip layer (1) and the second steel strip layer (2); S5, the third welding mechanism (10) is used for welding the outer spiral seam between the first steel strip layer (1) on the top outside of the pipe body.

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