Spiral welded steel pipe with shear nails

Abstract

The utility model relates to a spiral welded steel pipe with shear nails, the steel pipe comprises a pipe body, the pipe body is formed by welding a plurality of steel strips, and a spiral welding seam is arranged between every two adjacent steel strips; the multiple shear nails are arranged, and the multiple shear nails are welded to the inner wall or the outer wall of the pipe body at intervals; the concrete layer is arranged on the inner wall or the outer wall of the pipe body and covers the shear nails, and the thickness of the concrete layer is larger than the height of the shear nails. The combined structure of the shear nails and the concrete layer is arranged outside the steel pipe, and the shear nails serve as effective connecting pieces between the steel structure and the concrete to transmit shear force and tensile force between the steel plate and the concrete. The shear nails can greatly enhance the connecting strength of the steel column and the concrete, and the overall stress performance of the stiff column is improved.

Description

Technical Field

[0001] This application relates to the field of steel pipe processing technology, and in particular to spiral welded steel pipes with shear studs. Background Technology

[0002] Concrete-steel pipes are composite piping materials that combine the properties of concrete and steel. They not only possess the compressive strength and durability of steel pipes, but also have enhanced compressive strength and stability through an outer concrete layer, making them less prone to cracking under high pressure. This effectively solves the problem of bursting traditional concrete water supply pipes. Furthermore, concrete-steel pipes are less expensive than all-steel pipes, making them an economical and practical choice, especially suitable for water supply systems that need to withstand high pressure.

[0003] In traditional piping systems, concrete water supply pipes suffer from problems such as poor pressure resistance and susceptibility to bursting, primarily because concrete materials are prone to rupture under high pressure. Furthermore, the repair and replacement costs of concrete pipes are high, impacting production efficiency and economic benefits. While steel pipes possess excellent compressive strength and durability, their cost is high, and large-diameter pipes require an external concrete sheath to enhance their stability and safety. Steel pipes are flexible pipelines, capable of adapting to geological and structural changes such as ground and building settlement to a certain extent. This adaptability gives steel pipes an advantage in complex terrain and pipeline layouts. For large-diameter steel pipes, traditional buried pipe technology requires an external concrete sheath to provide additional support and protection. This sheathing not only increases costs but may also increase construction complexity. Utility Model Content

[0004] Therefore, it is necessary to provide a spiral welded steel pipe with shear studs that has high structural strength and good economic efficiency to address the above-mentioned technical problems.

[0005] On one hand, a spiral welded steel pipe with shear studs is provided, the steel pipe comprising:

[0006] The tube body is formed by spirally rolling and welding continuous steel strips, with a spiral weld between adjacent steel strips;

[0007] Shear studs, comprising a plurality of them, are welded at intervals to the inner or outer wall of the tube body; and

[0008] A concrete layer is provided on the inner or outer wall of the pipe body and covers the shear studs, wherein the thickness of the concrete layer is greater than the height of the shear studs.

[0009] In one embodiment, the tube body includes mutually nested components:

[0010] The outer tube has multiple shear studs spaced apart on its inner wall; and

[0011] An inner tube is disposed inside an outer tube to form a cavity between the outer tube and the inner tube, and a plurality of shear studs are provided at intervals on the outer wall of the inner tube;

[0012] The concrete layer is located inside the cavity.

[0013] In one embodiment, the concrete layer fills the cavity, and the thickness of the concrete layer is less than or equal to the sum of the shear stud lengths of the outer tube and the inner tube.

[0014] In one embodiment, the thickness of the cavity is less than or equal to the sum of the shear stud lengths of the outer tube and the shear stud lengths of the inner tube.

[0015] In one embodiment, the shear studs of the outer tube and the shear studs of the inner tube are arranged alternately.

[0016] In one embodiment, strip-shaped vertical plates are continuously provided on the steel strip, and after the steel strip forms the tube body, the vertical plates serve as spiral ring plates surrounding the tube body.

[0017] In one embodiment, the upright plate is parallel to the extension direction of the steel strip.

[0018] In one embodiment, the tube body is manufactured using a rolling mechanism, which has grooves for avoiding the shear studs.

[0019] In one embodiment, the tube body is made of steel plate with a thickness greater than 2.5 mm.

[0020] In one embodiment, the thickness of the concrete layer is 2mm-10mm higher than the height of the shear stud.

[0021] On the one hand, a method for processing a spiral welded steel pipe with shear studs is provided, the method comprising the steps of:

[0022] Multiple shear studs are welded at intervals onto a continuous steel strip to form a composite steel strip;

[0023] The composite steel strip is rolled into a spiral shape;

[0024] The composite steel strips of the welded spiral form a tube with a spiral weld seam;

[0025] A concrete layer is placed on the inner or outer wall of the pipe, the thickness of which is greater than the height of the shear studs.

[0026] In one embodiment, the step of rolling the composite steel strip into a spiral shape is achieved by a rolling mechanism having grooves for avoiding the shear studs.

[0027] In one embodiment, the step of forming the composite steel strip further includes: continuously providing strip-shaped upright plates on the steel strip to form the composite steel strip, wherein the upright plates are parallel to the forward direction of the composite steel strip during processing.

[0028] In one embodiment, the processing method includes the steps of:

[0029] Multiple shear studs are welded at intervals on the first side of the first steel strip to form a first composite steel strip;

[0030] Multiple shear studs are welded at intervals on the second side of the second steel strip to form a second composite steel strip;

[0031] The first composite steel strip is rolled into a spiral shape with the first side facing it, and the second composite steel strip is rolled into a spiral shape with the first side facing it.

[0032] The first and second composite steel strips are welded together to form an inner tube and an outer tube with a spiral weld.

[0033] The outer tube is fitted over the inner tube;

[0034] A layer of concrete is filled between the inner and outer pipes.

[0035] In one embodiment, after the step of welding a plurality of shear studs at intervals on the second side of the second steel strip, the method further includes: flipping the continuously conveyed first composite steel strip 180°.

[0036] In one embodiment, the step of fitting the outer tube onto the inner tube further includes: arranging the shear studs of the outer tube and the shear studs of the inner tube in an alternating manner.

[0037] This application has the following technical advantages:

[0038] (1) This application features a combined structure of shear studs and a concrete layer outside the steel pipe. The shear studs serve as an effective connector between the steel structure and the concrete, transferring the shear and tensile forces between the steel plate and the concrete. Shear studs can greatly enhance the connection strength between the steel column and the concrete, improve the overall load-bearing performance of the stiffened column, and effectively improve the shear resistance between the steel and concrete interface. This connection method not only improves the bonding strength between the two materials but also enables the load to be transferred more effectively between the steel and the concrete, thereby enhancing the load-bearing capacity of the entire structure.

[0039] (2) In concrete-filled steel tube structures, shear studs can strengthen the joint stress of the steel tube and the core concrete, and overcome the adverse effects of debonding between the steel tube and the core concrete. During the ejection process of concrete-filled steel tube specimens with shear studs, the core concrete inside the tube does not separate from the steel tube, and the role of the shear studs is fully utilized. Its ultimate load is 1.69 to 1.73 times that of the composite beam.

[0040] (3) For spiral welded steel pipes, the concrete layer can increase the connection strength of the weld after spiral welding, achieve a double bond with the weld, improve the connection strength of the pipe itself, and make the overall strength of the steel pipe have a double effect of improvement. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a shear nail tube according to an embodiment of this application.

[0042] Figure 2 This is a schematic diagram of a shear nail tube according to another embodiment of this application.

[0043] Figure 3 This is a schematic diagram of the structure of a steel pipe according to an embodiment of this application.

[0044] Figure 4 This is a schematic diagram of the structure of a steel pipe according to another embodiment of this application.

[0045] Figure 5 This is a schematic diagram of the processing method according to an embodiment of this application.

[0046] Explanation of icon numbers:

[0047] 1. Steel pipe; 10. Pipe body; 11. Inner pipe; 12. Outer pipe; 20. Shear stud; 30. Concrete layer. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] See Figure 1 , Figure 1 This diagram illustrates the structure of a spiral welded steel pipe with shear studs according to an embodiment of this application. The steel pipe 1 provided in this embodiment includes a pipe body 10, shear studs 20, and a concrete layer 30. The pipe body 10 is formed by welding continuous spirally rolled steel strips, with spiral welds between adjacent steel strips. Multiple shear studs 20 are provided, and these studs 20 are welded at intervals to the inner or outer wall of the pipe body 10. The concrete layer 30 is disposed on the inner or outer wall of the pipe body and covers the shear studs 20; the thickness of the concrete layer 30 is greater than the height of the shear studs 20.

[0050] This application utilizes a combined structure of shear studs and a concrete layer surrounding a steel tube. The shear studs act as effective connectors between the steel structure and the concrete, transferring shear and tensile forces between the steel plate and the concrete. Shear studs significantly enhance the connection strength between the steel column and the concrete, improving the overall load-bearing capacity of the reinforced column and effectively increasing the shear resistance at the steel-concrete interface. This connection method not only improves the bond strength between the two materials but also allows for more effective load transfer between the steel and concrete, thereby enhancing the overall load-bearing capacity of the structure. In concrete-filled steel tube structures, shear studs strengthen the joint load-bearing effect between the steel tube and the core concrete, overcoming the adverse effects of debonding between the steel tube and the core concrete. During the ejection process, the core concrete inside the steel tube of the steel tube with shear studs does not separate from the steel tube, and the effect of the shear studs is fully utilized. Its ultimate load is 1.69 to 1.73 times that of the composite beam. For spiral welded steel tubes, the concrete layer can increase the connection strength of the weld after spiral welding, achieving a double bond with the weld and improving the connection strength of the tube itself, resulting in a double-effect increase in the overall strength of the steel tube.

[0051] In one embodiment, the tube body 10 may be made of a steel plate with a thickness greater than 2.5 mm.

[0052] In one embodiment, the shear stud 20 is either a cylindrical head shear stud 20 or a bent shear stud 20. The overall length, head diameter, or tail diameter of the shear stud 20 is selected based on the required diameter of the pipe body 10 or the thickness of the steel plate used for the pipe body 10. Different stress zones can be divided on the same pipe body 10, and different sizes and structures of shear studs 20 are installed in different stress zones, with corresponding concrete layers 30 filled according to the shear studs 20.

[0053] In one embodiment, the shear stud 20 is avoided at the spiral weld.

[0054] In one embodiment, the thickness of the concrete layer 30 is 2mm-10mm greater than the height of the shear studs 20 to completely cover all the shear studs 20. The concrete layer 30 is positioned according to the orientation of the shear studs 20. The concrete includes cement, crushed stone, water, sand, and a water-reducing agent, for example, the concrete layer 30 includes 550-650 parts cement, 50-120 parts fly ash, 680-720 parts manufactured sand, 750-1000 parts crushed stone, 120-150 parts water, and a water-reducing agent.

[0055] In one embodiment, strip-shaped vertical plates are continuously provided on the steel strip, and after the steel strip forms the tube body, the vertical plates serve as spiral ring plates surrounding the tube body.

[0056] Specifically, the shear studs 20 are arranged adjacent to the upright plate (not shown in the figure). The upright plate-shear stud-upright plate arrangement can be adopted. The extension direction of the upright plate is parallel to the extension direction of the steel strip, so that after the steel strip is rolled into a circle, the upright plate is arranged in a spiral shape on the tube body 10, and the upright plate is parallel to the spiral weld.

[0057] In one embodiment, the pipe body 10 includes an outer pipe 12, with a plurality of shear studs 20 spaced apart on its inner wall, and an inner pipe 11 disposed inside the outer pipe 12 to form a cavity between the outer pipe 12 and the inner pipe 11, wherein a plurality of shear studs 20 are spaced apart on the outer wall of the inner pipe 11; wherein the concrete layer 30 is disposed within the cavity.

[0058] Both the inner tube 11 and the outer tube 12 are spiral welded steel pipes 1 formed using the same welding process. The diameter of the inner tube 11 is smaller than the diameter of the outer tube 12, so that the inner tube 11 is located inside the outer tube 12. Specifically, the inner tube 11 and the outer tube 12 are made of steel plates of the same or different thicknesses. The shear studs 20 on the inner or outer wall of the inner tube 11 and the shear studs 20 on the inner or outer wall of the outer tube 12 can be the same or different in size and structure.

[0059] Preferably, the inner tube 11 and the outer tube 12 are a first tube body 10 and a second tube body 10 continuously produced using the same steel strip. More preferably, the outer wall of the inner tube 11 is provided with shear studs 20, and the inner wall of the outer tube 12 is provided with shear studs 20, so that all the shear studs 20 are located within the cavity.

[0060] In one embodiment, the concrete layer 30 fills the cavity, and the thickness of the concrete layer 30 is less than or equal to the sum of the lengths of the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11.

[0061] In one embodiment, the thickness of the cavity is less than or equal to the sum of the lengths of the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11.

[0062] In one embodiment, the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11 are arranged alternately.

[0063] Specifically, in the embodiment where shear studs 20 are provided on the outer wall of the inner tube 11 and the inner wall of the outer tube 12, the concrete layer 30 fills the cavity. The shear studs 20 of the inner tube 11 and the outer tube 12 share a single concrete layer 30, and the thickness of the concrete layer 30 is the thickness of the cavity (i.e., the radius difference between the inner tube 11 and the outer tube 12). Alternatively, the concrete layer 30 may not fill the cavity, but its two sides may be attached to the walls of the outer tube 12 and the inner tube 11, respectively. In this case, the shear studs 20 of the inner tube 11 and the outer tube 12 may have corresponding concrete layers 30.

[0064] Furthermore, the thickness of the concrete layer 30 (or the thickness of the cavity) is less than or equal to the sum of the lengths of the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11, such that the lengths of the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11 are staggered in the tube body 10. The shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11 can be staggered in the axial direction and / or staggered in the cross-sectional direction of the tube body 10.

[0065] Furthermore, the height of the vertical plate is consistent with the thickness of the cavity. One of the outer wall of the inner tube and the inner wall of the outer tube has a vertical plate, and the other abuts against the end of the vertical plate, so that the spiral ring formed by the vertical plate abuts against both ends of the inner tube 11 and the outer tube 12, dividing the cavity into a spiral cavity, within which the concrete layer is placed. Alternatively, the height of the vertical plate is less than the thickness of the cavity, and at least one of the outer wall of the inner tube and the inner wall of the outer tube has a vertical plate, so that the two ends of the vertical plate divide the cavity into a labyrinthine cavity, within which the concrete layer is placed.

[0066] See Figure 5 This application also provides a method for processing a spiral welded steel pipe 1 with shear studs 20. Figure 5 A schematic flowchart of a processing method for a spiral welded steel pipe 1 with shear studs 20 is shown. The processing method includes the following steps:

[0067] S100. Multiple shear studs 20 are welded at intervals onto a continuous steel strip to form a composite steel strip;

[0068] S200, The composite steel strip is rolled into a spiral shape;

[0069] S300, a composite steel strip with a welded spiral is used to form a pipe body 10 with a spiral weld.

[0070] S400, A concrete layer 30 is placed on the inner or outer wall of the pipe body 10, the thickness of which is greater than the height of the shear studs 20.

[0071] In one embodiment, in step S100, the shear studs 20 can be welded in a regular array or in an irregular quincunx pattern. Since the steel strip is spirally welded, the shear studs 20 can also be spirally arranged so that the shear studs 20 on the rolled tube 10 are arrayed in the axial direction. That is, for the rolled tube 10, multiple vertical shear studs 20 are distributed in an equally spaced array along the axis of the tube 10, and multiple horizontal shear studs 20 are also distributed in an equally spaced array along the perimeter of the tube 10.

[0072] As a preferred example, step S100 employs an arc-type stud welding method to weld shear studs 20 onto a steel strip, arranging them with a spacing of 35cm × 35cm between each shear stud. The welding frequency is 12 studs / min, the penetration depth (H2) is controlled at 1mm, the diameter D1 of the shear stud 20 is 10mm, the height H1 of the shear stud 20 is 5cm, the spacing D3 of the shear studs 20 is 35cm, and the material of the shear studs 20 is ordinary threaded steel.

[0073] In one embodiment, step S100, the step of forming the composite steel strip further includes: continuously providing strip-shaped vertical plates on the steel strip to form the composite steel strip, wherein the vertical plates are parallel to the forward direction of the composite steel strip during processing. Specifically, the extension direction of the vertical plates is parallel to the extension direction of the steel strip, so that after the steel strip is rolled into a circle, the vertical plates are arranged in a spiral shape on the tube body 10, and the vertical plates are parallel to the spiral weld.

[0074] In one embodiment, step S200, which involves rolling the composite steel strip into a spiral shape, is implemented using a rolling mechanism. This rolling mechanism has grooves for avoiding the shear studs 20. Specifically, the pressure roller of the spiral rolling mechanism has grooves for avoiding the shear studs 20. The grooves are recessed into the pressure roller, and the depth of the recess corresponds to the size of the shear studs 20. Furthermore, the extension direction of the grooves corresponds to the rolling direction of the composite steel strip and the arrangement direction of the shear studs 20.

[0075] In one embodiment, the processing method includes the steps of:

[0076] S101. Multiple shear studs 20 are welded at intervals on the first side of the first steel strip to form a first composite steel strip;

[0077] S102. Multiple shear studs 20 are welded at intervals on the second side of the second steel strip to form a second composite steel strip;

[0078] S201. The first composite steel strip is rolled into a spiral shape with the first side facing it, and the second composite steel strip is rolled into a spiral shape with the first side facing it.

[0079] S301. The first and second composite steel strips are welded to form an inner tube 11 and an outer tube 12 with spiral welds, respectively.

[0080] S401. Fit the outer tube 12 onto the inner tube 11;

[0081] S402. Fill the space between the inner pipe 11 and the outer pipe 12 with a concrete layer 30.

[0082] Specifically, before step S100, the procedure includes the step of continuously conveying multiple steel strips to the welding mechanism. The dimensions of each steel strip can be the same or different. When the dimensions of each steel strip are the same, if the diameter of the subsequent first composite steel strip is smaller, the resulting tube 10 will be longer. After step S301, the procedure also includes cutting the length of the inner tube 11 to match the length of the outer tube 12. When the dimensions of each steel strip are different, adjacent steel strips are grouped together, with the length or width of the first steel strip being smaller than that of the second steel strip. Subsequently, the first and second composite steel strips are rolled into inner tubes 11 and outer tubes 12 with different diameters, and their lengths are matched.

[0083] The steel strip includes a first side and a second side. The first side of the steel strip is defined as the upward-facing side, and the side of the steel strip that contacts the conveying mechanism is defined as the second side. In the subsequent step S201, during the winding process, the winding mechanism bends and winds the composite steel strip toward the first side.

[0084] In one embodiment, after the step of welding a plurality of shear studs 20 at intervals on the second side of the second steel strip, the method further includes: flipping the continuously conveyed first composite steel strip 180°.

[0085] The first composite steel strip, serving as the inner tube 11, requires shear studs 20 to be installed on its outer wall (i.e., the outer side during rolling). Therefore, during rolling, the first side with the welded shear studs 20 needs to be placed on the second side, necessitating the first composite steel strip being flipped before rolling. For multiple continuously conveyed steel strips, two strips are grouped together, and the first strip in each group serves as the first steel strip and the first composite steel strip, repeating this step. The second composite steel strip, serving as the outer tube 12, requires shear studs 20 to be installed on its inner wall (i.e., the inner side during rolling). Since the welded shear studs 20 are all on the first side of the steel strip, flipping is not required. The vertical plate and shear studs 20 of each steel strip are located on the same side.

[0086] In one embodiment, step S401, which involves fitting the outer tube 12 onto the inner tube 11, further includes: arranging the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11 in an alternating manner. Specifically, step S401 further includes adjusting the relative positions of the inner tube 11 and the outer tube 12 so that the inner tube 11 enters the outer tube 12 and the shear studs 20 of the inner tube 11 and the shear studs 20 of the outer tube 12 do not interfere with each other. Further, adjusting the relative positions of the inner tube 11 and the outer tube 12 includes rotation and axial movement, ultimately causing the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11 to be staggered in the axial direction and / or staggered in the cross-sectional direction of the tube body 10.

[0087] In one embodiment, the step of filling the concrete layer 30 in steps S400 and S401 further includes the following step:

[0088] S410, Set grouting holes and venting holes;

[0089] S420. Inject concrete grout through the grouting hole, and stop injecting after the grout is discharged from the vent hole.

[0090] As a preferred example, the concrete can be poured in multiple stages, such as three times:

[0091] For the first injection, leave one φ50mm vent hole and two φ100mm injection holes in the middle or at the end of the outer pipe 12. The delivery pump directly fills the self-compacting concrete through the injection holes. Stop when the concrete in the pipe reaches about 30%-40% to allow the concrete in the cavity to solidify and fix the inner pipe 11 and the outer pipe 12 to prevent the inner and outer pipes 12 from shifting.

[0092] For the second pour, within an interval of 2-3 hours (during the initial setting period of the concrete), continue the above filling process until the concrete in the pipe reaches about 60-70%.

[0093] The third injection, after an interval of 2-3 hours, involves injecting self-compacting concrete via a delivery pump until concrete slurry flows out of the vent hole, thus achieving saturation within the casing.

[0094] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0095] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0096] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0097] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0098] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A spiral welded steel pipe with shear studs, characterized in that, The steel pipe includes: The tube body is formed by spirally rolling and welding continuous steel strips, with a spiral weld between adjacent steel strips; Shear studs, comprising a plurality of them, are welded at intervals to the inner or outer wall of the tube body; and A concrete layer is provided on the inner or outer wall of the pipe body and covers the shear studs, wherein the thickness of the concrete layer is greater than the height of the shear studs; The tubular body comprises interconnected components: The outer tube has multiple shear studs spaced apart on its inner wall; and An inner tube is disposed inside an outer tube to form a cavity between the outer tube and the inner tube. A plurality of shear studs are provided at intervals on the outer wall of the inner tube, and the shear studs of the outer tube and the shear studs of the inner tube are arranged alternately. The concrete layer is located inside the cavity; The steel strip is continuously provided with strip-shaped vertical plates. After the steel strip forms the tube body, the vertical plates serve as spiral ring plates surrounding the tube body. The height of the vertical plates is consistent with the thickness of the cavity. One of the outer wall of the inner tube and the inner wall of the outer tube is provided with the vertical plate, and the other abuts against the end of the vertical plate, so that the spiral ring plate formed by the vertical plates abuts against the inner tube and the outer tube at both ends, thereby dividing the cavity into a spiral cavity. The concrete layer is provided in the spiral cavity.

2. The spiral welded steel pipe with shear studs according to claim 1, characterized in that, The concrete layer fills the cavity, and the thickness of the concrete layer is less than or equal to the sum of the shear stud lengths of the outer tube and the inner tube.

3. The spiral welded steel pipe with shear studs according to claim 1, characterized in that, The thickness of the cavity is less than or equal to the sum of the shear stud lengths of the outer tube and the inner tube.

4. The spiral welded steel pipe with shear studs according to claim 1, characterized in that, The vertical plate is parallel to the extension direction of the steel strip.

5. The spiral welded steel pipe with shear studs according to claim 1, characterized in that, The tube body is processed by a rolling mechanism, which has grooves for avoiding the shear nails.

6. The spiral welded steel pipe with shear studs according to claim 1, characterized in that, The pipe body is made of steel plate with a thickness greater than 2.5 mm.

7. The spiral welded steel pipe with shear studs according to claim 1, characterized in that, The thickness of the concrete layer is 2mm-10mm higher than the height of the shear stud.

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