Composite structure steel pipe with spiral corrugations on outer wall and manufacturing equipment

Abstract

The utility model discloses a combined structure steel pipe with spiral corrugations on the outer wall and manufacturing equipment. The steel pipe is formed by spirally rolling and welding 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 equal in width, staggered and attached, the first steel belt layer is a corrugated steel belt, the second steel belt layer is a straight steel belt, and the side edge of the second steel belt layer is staggered with the side edge of the first steel belt layer in the axial extension direction of pipe body forming. The attaching line of the first steel belt layer and the second steel belt layer is a welding seam between the two layers of steel belts, and the first steel belt layer is the outer pipe wall of the steel pipe. According to the utility model, the corrugated steel belt is firstly independently rolled, so that the corrugated steel belt is stable in shape and is not rolled, bent and deformed in the rolling process; in the forming process, the inner wall (the straight steel belt) cannot be compressed in the circumferential direction, the inner wall is straight and flat, and wavy deformation is not prone to being generated.

Description

Technical Field

[0001] The utility model relates to the technical field of water delivery steel pipes and production, in particular to a combined structural steel pipe with spiral corrugations on the outer wall and manufacturing equipment. Background Art

[0002] The applicant has previously applied for a patent application with application number 2022111502754, entitled A large-diameter thin-walled spiral welded pipe and a method for manufacturing the same. The main scheme is: the pipe wall of the steel pipe is welded from a double-layer steel pipe into a composite steel strip, and then spirally rolled and welded to form a spiral seam, wherein the inner wall of the double-layer pipe wall is a straight steel strip, and the outer wall is a corrugated steel strip. The two steel strips are of equal width. After the two layers of steel strips are bonded together, the side ends of the two layers of steel strips are welded, and the wave crests of the corrugated steel strip and the contact line of the flat steel strip are welded (using full penetration welding or penetration welding). After the composite steel strip is formed, it is sent to a special spiral rolling welding equipment for rolling and welding the spiral seam.

[0003] The above structure and manufacturing method may have the following problems during actual testing:

[0004] First of all, for the structure of the product, the spiral weld is to weld the two sides of the composite steel strips with equal widths. Both sides are the primary welds after the inner and outer steel strips are welded, and the spiral weld is the secondary weld of these two primary welds. Since the primary welds have welding deformation and different weld shapes after welding, the weld quality is unstable during the secondary welding, the surface quality is poor, and there are pores and water leakage. In addition, from a structural point of view, the three welds are concentrated and overlapped, forming stress concentration, which affects the structural quality of the steel pipe.

[0005] In addition, in terms of manufacturing, after the contact seams of the inner and outer steel strips are welded together, their cross-sections form multiple independent cavities. When rolling, the outer wall of the cavity stretches and the inner wall shrinks, and the inner wall is prone to buckling and deformation, and wrinkles. This is especially true when the wave height is high and the inner wall is thin. If an anti-buckling and anti-deformation lining is set in the cavity to assist in rolling, the friction generated by the lining core rod is too large, and the steel strip is difficult to deliver. In addition, the shape of these non-standard cavities is not like the round steel pipe elbow. When the lining core is round, it can prevent the steel pipe from deforming when it is bent. The bending of the steel pipe and the lining core rod in the pipe are as follows: Figure 8 As mentioned above. The non-standard cavity has two narrow gaps, which makes it difficult to set the anti-deformation lining core for auxiliary rolling; during the rolling process, the weld at the wave crest between the inner and outer wall steel strips shrinks most seriously, making the inner wall prone to wave-like deformation, unevenness, and unevenness. In addition, the spiral seam of the steel strip must be located at the wave crest, which is easy to deform during rolling and become a lotus leaf edge, seriously affecting the quality of butt welding. Summary of the invention

[0006] Purpose of the invention: In order to overcome the shortcomings of the background technology, the utility model:

[0007] The first object is to disclose a composite structural steel pipe with spiral corrugations on the outer wall;

[0008] The second purpose is to disclose the manufacturing equipment of the composite structural steel pipe with spiral corrugations on the outer wall.

[0009] Technical solution: The composite structural steel pipe with spiral corrugations on the outer wall disclosed by the utility model is formed by spirally rolling and welding a double-layer composite steel strip; the double-layer composite steel strip includes a first steel strip layer and a second steel strip layer of equal width, staggered and fitted together, the first steel strip layer is a corrugated steel strip, the second steel strip layer is a straight steel strip, the side of the second steel strip layer is staggered from the side of the first steel strip layer in the axial elongation direction formed toward the tube body, the fitting line between the first steel strip layer and the second steel strip layer is the weld between the two steel strip layers, and the first steel strip layer is the outer tube wall of the steel pipe.

[0010] Furthermore, the spiral welding seams between the second steel strip layers are located at the wave crests of the first steel strip layer and are welded to the wave crests as a whole.

[0011] Furthermore, the spiral seams between the first steel belt layers are located at the waist of the waveform.

[0012] Furthermore, the spiral seams between the first steel strip layers are welded seams after biting.

[0013] Furthermore, the cavity between the first steel belt layer and the second steel belt layer is filled with concrete or mortar.

[0014] Furthermore, shear nails are arranged in the cavity.

[0015] The manufacturing equipment of the composite structural steel pipe with spiral corrugations on the outer wall comprises a delivery roller, a guide roller, a rounding roller, a winding roller and a pressing roller;

[0016] The first steel strip layer is rolled up by a delivery roller, a guide roller, a rounding roller, and a rounding roller in sequence, and a first welding mechanism for welding the seam between the corrugated steel strip and the corrugated steel strip formed into a tube body is provided behind the rounding roller, and the first welding mechanism is located inside the contour of the tube body;

[0017] The pressing roller is located behind the rounding roller. After the second steel strip layer is unwound by the unwinding machine, it is pressed onto the first steel strip layer that has just passed the rounding roller by the pressing roller. A second welding mechanism for welding the joining line between the first steel strip layer and the second steel strip layer is provided. The second welding mechanism is a penetrating welder, such as laser self-melting welding, and a third welding mechanism for welding the outer spiral seam between the first steel strip layers is provided on the outer side of the top of the tube body.

[0018] Furthermore, the first steel belt layer is the outer wall of the steel pipe, and the pressing roller is located inside the contour of the spiral corrugated steel pipe body that is being rolled.

[0019] Furthermore, the second welding mechanisms are arranged at circumferential intervals corresponding to adjacent waveforms, and a pressing roller is arranged at each welding position.

[0020] Furthermore, a third welding mechanism for welding the outer spiral seams between the first steel strip layers is arranged on the top of the pipe body.

[0021] Furthermore, the guide roller, the rounding roller and the winding roller are all composed of a plurality of rollers with adjustable angles, and the outer dimensions of the rollers match the waveform dimensions of the first steel strip layer.

[0022] The manufacturing method of the composite structural steel pipe with spiral corrugations on the outer wall comprises the following steps:

[0023] S1, preparing a corrugated steel strip, i.e., a first steel strip layer, and delivering the first steel strip layer to a rolling device;

[0024] S2. After the corrugated steel strip passes through the rounding roller, the first welding mechanism is immediately used to weld the inner seam between the corrugated steel strip and the corrugated steel strip formed into a tube body;

[0025] S3, a straight steel strip, i.e., the second steel strip layer, is released behind the rounding roller and pressed by the pressing roller onto the first steel strip layer that has just passed the rounding roller. During pressing, the second steel strip layer is translated in the direction of the elongation of the tube body forming length, so that the side edge of the second steel strip layer is staggered with the side edge of the first steel strip layer, and covers the spiral seam inside the tube between the first steel strip layers that have just been rolled and welded;

[0026] S4, welding the joining line between the first steel strip layer and the second steel strip layer by using a second welding mechanism;

[0027] S5. Welding the outer spiral seams between the first steel strip layers on the top outer side of the pipe body by using a third welding mechanism.

[0028] Beneficial effects: Compared with the prior art, the advantages of the utility model are:

[0029] 1. The combined structure pipe body has good circumferential stiffness and improved axial strength. The wave height of the corrugation increases the moment of inertia of the longitudinal section of the pipe body wall;

[0030] 2. The inside of the tube is a smooth tube wall with small flow resistance;

[0031] 3. The ability of the combined structure pipe body to withstand internal water pressure is improved;

[0032] 4. Avoid overlapping of spiral welds on the pipe body and avoid stress concentration on the welds;

[0033] 5. The pipe is light and easy to construct;

[0034] 6. The corrugated steel strip is rolled up separately first, so that the shape of the corrugated steel strip is stable during the rolling process, without buckling or deformation;

[0035] 7. During the forming process, the inner wall (straight steel strip) will not be compressed in the circumferential direction, and the inner wall is straight and smooth. It is not easy to produce wavy deformation;

[0036] 8. The inner wall weld and the outer wall weld are staggered, which is not easy to cause weld stress concentration; the inner and outer wall welds are staggered, no overlap is formed, and the weld quality is controllable;

[0037] 9. The joints between the inner walls form a trinity weld at the wave crest, which has high strength. At the same time, the wave crest acts as a welding pad, which is beneficial to the alignment of the inner wall steel strip joints and improves the weld quality;

[0038] 10. The welding between the corrugated steel strips is set at the waist of the wave, not at the top of the wave, to avoid the overlap of the weld and the penetration weld between the inner wall steel strips;

[0039] 11. The corrugated seams set at the corrugated waist are first connected by bite, which can avoid the formation of ruffles on the corrugated side during forming and curling, affecting docking and welding. The welding after bite increases the strength of the seam at this location;

[0040] 12. It can roll corrugated steel strips with higher wave height and thinner thickness, and can produce pipes with thinner inner walls, and the thinner inner walls will not be deformed;

[0041] 13. After the inner wall steel strip is staggered in the elongation direction of the pipe body, the key installation space is left for the tooling and equipment for the curling of the side of the corrugated steel strip and the welding process of the spiral seams between the corrugated steel strips;

[0042] 14. After the spiral cavity between the inner and outer pipe walls is filled with concrete, the pipe body forms a composite structure. The concrete and the pipe wall reinforce each other, the ring stiffness of the pipe body is increased, and the material consumption is reduced. In addition, the concrete can transmit force between the inner and outer pipe walls. The pipe body can withstand large internal and external pressures, and in particular, the thickness of the inner wall can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the cross-sectional structure of the double-layer composite steel belt of the utility model;

[0044] Figure 2 It is a schematic diagram of the spiral joint located at the waist of the waveform between the first steel belt layers of the utility model;

[0045] Figure 3 This is a structural diagram of the manufacturing equipment for this utility model;

[0046] Figure 4 This is a cross-sectional view of the delivery roller of the utility model;

[0047] Figure 5 It is a top view of the contact position between the rounding roller and the first steel belt layer of the utility model;

[0048] Figure 6 This is a cross-sectional view of the pressing roller of the utility model;

[0049] Figure 7 This is a schematic diagram of the tube body molding structure of the utility model;

[0050] Figure 8 It is a schematic diagram of steel pipe bending and pipe lining mandrel in the background technology. DETAILED DESCRIPTION

[0051] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0052] A composite structural steel pipe with spiral corrugations on the outer wall is formed by spirally rolling and welding double-layer parallel composite steel strips.

[0053] like Figure 1 As shown, the double-layer composite steel strip includes a first steel strip layer 1 and a second steel strip layer 2 of equal width, staggered and fitted together, the first steel strip layer 1 is a corrugated steel strip, the second steel strip layer 2 is a straight steel strip, the side of the second steel strip layer 2 is staggered from the side of the first steel strip layer 1 in the axial extension direction formed toward the tube body, the fitting line between the first steel strip layer 1 and the second steel strip layer 2 is the weld between the two layers of steel strips, and the first steel strip layer 1 is the outer tube wall of the steel pipe.

[0054] The spiral welding seams between the second steel strip layers 2 are located at the wave crests of the first steel strip layer 1 and are welded to the wave crests as a whole.

[0055] like Figure 2 As shown, the spiral seam between the first steel strip layers 1 is located at the waist of the waveform and is a welded seam after the bite.

[0056] The cavity between the first steel belt layer 1 and the second steel belt layer 2 is filled with concrete or mortar, and shear nails are arranged in the cavity.

[0057] The present invention also provides a manufacturing device for the composite structural steel pipe with spiral corrugations on the outer wall, such as Figure 3 and Figure 4 As shown, it includes a delivery roller 3, a guide roller 4, a rounding roller 5, a winding roller 6 and a pressing roller 7.

[0058] The first steel strip layer 1 is rolled into shape by passing through the delivery roller 3, the guide roller 4, the rounding roller 5 and the winding roller 6 in sequence. A first welding mechanism 8 for welding the seam between the corrugated steel strip and the corrugated steel strip formed into a tube body is provided behind the rounding roller 5. The first welding mechanism 8 is located inside the tube body contour; the pressing roller 7 is located behind the rounding roller 5. After the second steel strip layer 2 is unwound by the unwinding machine, it is pressed onto the first steel strip layer 1 that has just passed through the rounding roller 5 by the pressing roller 7. A second welding mechanism 9 for welding the joining line between the first steel strip layer 1 and the second steel strip layer 2 is provided. The second welding mechanism 9 is a penetrating welder, such as laser self-melting welding, and a third welding mechanism 10 for welding the outer spiral seam between the first steel strip layers 1 is provided on the outer side of the top of the tube body.

[0059] Since the first steel strip layer 1 is the outer wall of the steel pipe, the pressing roller 7 is located inside the contour of the spiral corrugated steel pipe body being rolled.

[0060] The second welding mechanisms 9 are arranged at circumferential intervals corresponding to adjacent waveforms, and a pressing roller 7 is arranged at each welding position.

[0061] A third welding mechanism 10 for welding the outer spiral seams between the first steel strip layers 1 is arranged on the top of the pipe body.

[0062] The guide roller 4, the rounding roller 5 and the winding roller 6 are all composed of a plurality of rollers with adjustable angles, and the outer dimensions of the rollers match the waveform dimensions of the first steel strip layer 1. Figure 5 As shown, the center line of the roller is parallel to the axis line of the tube body.

[0063] The manufacturing method of the manufacturing equipment of the composite structural steel pipe with spiral corrugations on the outer wall comprises the following steps:

[0064] S1, preparing a corrugated steel strip, i.e., a first steel strip layer 1, and delivering the first steel strip layer 1 to a rolling device;

[0065] S2, after the corrugated steel strip passes through the rounding roller 5, the first welding mechanism 8 is immediately used to weld the inner seam between the corrugated steel strip and the corrugated steel strip formed into a tube body;

[0066] S3, a straight steel strip, i.e., the second steel strip layer 2, is released behind the rounding roller 5, and is pressed by the pressing roller 7 onto the first steel strip layer 1 that has just passed the rounding roller 5. During the pressing, the second steel strip layer 2 is translated in the direction of the elongation of the tube body forming length, 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 spiral seam inside the tube between the first steel strip layers 1 that have just been rolled and welded;

[0067] S4, using the second welding mechanism 9 to weld the bonding line between the first steel strip layer 1 and the second steel strip layer 2;

[0068] S5, welding the outer spiral seams between the first steel strip layers 1 with the third welding mechanism 10 on the top outer side of the pipe body, such as Figure 6 and 7 As shown, Figure 6 P1 is the spiral weld between the first steel strip layers, P2 is the second steel strip layer being pressed, P3 is the second steel strip layer that has become the pipe body, P4 is the spiral weld between the second steel strip layers, and P5 is the weld at the joining line between the first steel strip layer and the second steel strip layer; Figure 7 Among them, P6 is the offset between the first steel belt layer and the second steel belt layer, P7 is the formed pipe body, P8 is the side offset between the second steel belt layer and the first steel belt layer, P9 is the weld between the first steel belt layer and the second steel belt layer, and P10 is the spiral weld of the first steel belt layer.

Claims

1. A composite structural steel pipe with spiral corrugations on the outer wall, characterized in that: The double-layer composite steel strip is formed by spirally rolling and welding; the double-layer composite steel strip comprises a first steel strip layer (1) and a second steel strip layer (2) of equal width, staggered and fitted, the first steel strip layer (1) being a corrugated steel strip, the second steel strip layer (2) being a straight steel strip, the side edge of the second steel strip layer (2) being staggered with the side edge of the first steel strip layer (1) in the axial extension direction of the tube body, the fitting line between the first steel strip layer (1) and the second steel strip layer (2) being the weld between the two steel strip layers, and the first steel strip layer (1) being the outer tube wall of the steel tube.

2. The composite structural steel pipe with spiral corrugations on the outer wall according to claim 1, characterized in that: The spiral weld seams between the second steel strip layers (2) are located at the wave crests of the first steel strip layer (1) and are welded to the wave crests as a whole.

3. The composite structural steel pipe with spiral corrugations on the outer wall according to claim 1, characterized in that: The spiral seams between the first steel strip layers (1) are located at the waist of the waveform.

4. The composite structural steel pipe with spiral corrugations on the outer wall according to claim 3, characterized in that: The spiral seams between the first steel strip layers (1) are welded seams after biting.

5. The composite structural steel pipe with spiral corrugations on the outer wall according to claim 1, characterized in that: The cavity between the first steel belt layer (1) and the second steel belt layer (2) is filled with concrete or mortar.

6. The composite structural steel pipe with spiral corrugations on the outer wall according to claim 5, characterized in that: A shear nail is arranged in the cavity.

7. A manufacturing device, comprising the composite structural steel pipe with spiral corrugations on the outer wall as claimed in claim 1, characterized in that: It comprises a delivery roller (3), a guide roller (4), a rounding roller (5), a winding roller (6) and a pressing roller (7); The first steel strip layer (1) is rolled into a round shape by sequentially passing through a delivery roller (3), a guide roller (4), a rounding roller (5), and a rounding roller (6), and a first welding mechanism (8) is provided behind the rounding roller (5) for welding the seam between the corrugated steel strip and the corrugated steel strip formed into a tube body, and the first welding mechanism (8) is located inside the contour of the tube body; The pressing roller (7) is located behind the rounding roller (5); the second steel strip layer (2) is unwound by the unwinding machine and pressed onto the first steel strip layer (1) that has just passed the rounding roller (5) by the pressing roller (7); a second welding mechanism (9) is provided for welding the joining line between the first steel strip layer (1) and the second steel strip layer (2); and a third welding mechanism (10) is provided on the outer side of the top of the tube body for welding the outer spiral seam between the first steel strip layers (1).

8. The manufacturing equipment according to claim 7, characterized in that: The first steel strip layer (1) is the outer wall of the steel pipe, and the pressing roller (7) is located inside the contour of the spiral corrugated steel pipe body that is being rolled.

9. The manufacturing equipment according to claim 7, characterized in that: The second welding mechanisms (9) are arranged at circumferential intervals corresponding to adjacent waveforms, and a pressing roller (7) is arranged at each welding position.

10. The manufacturing equipment according to claim 7, characterized in that: A third welding mechanism (10) is arranged on the top of the pipe body for welding the outer spiral seam between the first steel strip layers (1).

11. The manufacturing equipment according to claim 7, characterized in that: The guide roller (4), the rounding roller (5) and the winding roller (6) are all composed of a plurality of rollers with adjustable angles, and the outer dimensions of the rollers match the waveform dimensions of the first steel strip layer (1).

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