Spiral welded steel pipe with shear nails and machining method of spiral welded steel pipe

Abstract

The invention relates to a spiral welded steel pipe with shear nails and a machining method thereof.The steel pipe comprises a pipe body, the pipe body is formed by welding a plurality of steel strips, and spiral welding seams are formed between the 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 connection strength of the steel column and the concrete, improve the overall stress performance of the stiff column, and effectively improve the shear resistance between the steel and concrete interfaces.

Description

Technical Field

[0001] The present application relates to the technical field of steel pipe processing, and in particular to a spiral welded steel pipe with shear nails and a processing method thereof. Background Art

[0002] Concrete steel pipe is a composite pipe material that combines the characteristics of concrete and steel pipe. It not only has the compressive performance and durability of steel pipe, but also enhances its compressive strength and stability through the outer concrete layer, making it less likely to break under high pressure, effectively solving the problem of traditional concrete water supply pipes being prone to explosion. In addition, concrete steel pipe is cheaper than all-steel pipes and is an economical and practical choice, especially suitable for water supply systems that need to withstand high pressure.

[0003] In the traditional pipeline system, concrete water supply pipes are not resistant to high pressure and are prone to explosion. This is mainly because concrete materials are prone to rupture under high pressure. In addition, the cost of repairing and replacing concrete pipes is high, which affects production efficiency and economic benefits. Although steel pipes have good compressive resistance and durability, they are expensive and need to be wrapped with concrete when they are large in diameter to enhance their stability and safety. Steel pipes are flexible pipes and can adapt to geological and structural changes such as ground subsidence and building subsidence 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 external concrete to provide additional support and protection. This external concrete not only increases costs, but may also increase the complexity of construction. Summary of the invention

[0004] Based on this, it is necessary to provide a spiral welded steel pipe with shear nails and a processing method thereof with high structural strength and good economy in order to solve the above technical problems.

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

[0006] A pipe body, wherein the pipe body is formed by spirally rolling and welding continuous steel strips, and spiral welds are formed between adjacent steel strips;

[0007] There are a plurality of shear nails, wherein the plurality of shear nails are welded at intervals to the inner wall or the outer wall of the pipe body; and

[0008] A concrete layer is arranged on the inner wall or the outer wall of the tube body and covers the shear nails. The thickness of the concrete layer is higher than the height of the shear nails.

[0009] In one embodiment, the tube body comprises:

[0010] An outer tube, the inner wall of which is provided with a plurality of said shear nails at intervals; and

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

[0012] Wherein, the concrete layer is arranged in the cavity.

[0013] In one of the embodiments, strip-shaped vertical plates are continuously arranged 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.

[0014] In one of the embodiments, the concrete layer completely fills the cavity, and the thickness of the concrete layer is less than or equal to the sum of the shear stud length of the outer tube and the shear stud length of the inner tube.

[0015] In one embodiment, the thickness of the cavity is less than or equal to the sum of the shear nail length of the outer tube and the shear nail length of the inner tube.

[0016] In one embodiment, the shear studs of the outer tube and the shear studs of the inner tube are arranged alternately.

[0017] A method for processing a spiral welded steel pipe with shear nails, the processing method comprising the steps of:

[0018] Multiple shear nails are welded at intervals on a continuous steel strip to form a composite steel strip;

[0019] Roll the composite steel strip into a spiral shape;

[0020] The spirally welded composite steel strip forms a pipe body having a spiral weld;

[0021] The inner wall or the outer wall of the pipe body is covered with a concrete layer, and the thickness of the concrete layer is higher than the height of the shear nails.

[0022] In one of the embodiments, the step of rolling the composite steel strip into a spiral shape is achieved by using a rolling mechanism, and the rolling mechanism is provided with grooves for avoiding the shear nails.

[0023] In one of the embodiments, the step of forming the composite steel strip further includes: continuously arranging 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.

[0024] In one embodiment, the processing method comprises the steps of:

[0025] welding a plurality of shear studs at intervals on a first side of a first steel strip to form a first composite steel strip;

[0026] welding a plurality of shear studs at intervals on a second side of the second steel strip to form a second composite steel strip;

[0027] Rolling the first composite steel strip toward the first side into a spiral shape, and rolling the second composite steel strip toward the first side into a spiral shape;

[0028] Welding the spiral first composite steel strip and the second composite steel strip respectively to form an inner tube and an outer tube having a spiral weld;

[0029] Sleeve the outer tube onto the inner tube;

[0030] A concrete layer is filled between the inner and outer pipes.

[0031] In one of the embodiments, after the step of welding a plurality of shear nails at intervals on the second side of the second steel strip, the step further includes: turning the continuously conveyed first composite steel strip by 180°.

[0032] In one of the embodiments, the step of sleeve-mounting the outer tube on the inner tube further comprises: arranging the shear pins of the outer tube and the shear pins of the inner tube alternately.

[0033] This application has the following technical effects:

[0034] (1) This application sets a combined structure of shear nails and concrete layers outside the steel pipe. The shear nails serve as effective connectors between the steel structure and the concrete, transferring the shear and tensile forces between the steel plate and the concrete. The shear nails can greatly strengthen the connection strength between the steel column and the concrete, improve the overall force performance of the rigid column, and effectively improve the shear resistance of the interface between the steel and concrete. This connection method not only improves the bonding strength between the two materials, but also enables the load to be more effectively transferred between the steel and the concrete, thereby enhancing the bearing capacity of the entire structure.

[0035] (2) In steel tube concrete structures, shear studs can strengthen the joint force between the steel tube and the core concrete, and overcome the adverse effects of debonding between the steel tube and the core concrete. During the push-out process of the steel tube concrete specimen with shear studs, the core concrete in the tube will not separate from the steel tube, and the role of the shear studs is fully exerted. Its ultimate load is 1.69 to 1.73 times that of the composite beam.

[0036] (3) For the spirally welded steel pipe body, the concrete layer can increase the connection strength of the pipe body weld after spiral welding, achieve double bonding with the weld, improve the connection strength of the pipe body itself, and make the overall strength of the steel pipe have a double effect increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG. 1 is a schematic structural diagram of a tube body with shear nails according to an embodiment of the present application.

[0038] FIG. 2 is a schematic structural diagram of a shear nail tube body according to another embodiment of the present application.

[0039] FIG. 3 is a schematic diagram of the structure of a steel pipe according to an embodiment of the present application.

[0040] FIG. 4 is a schematic structural diagram of a steel pipe according to another embodiment of the present application.

[0041] FIG. 5 is a schematic diagram of the steps of a processing method according to an embodiment of the present application.

[0042] Description of Figure Numbers:

[0043] 1. Steel pipe; 10. Pipe body; 11. Inner pipe; 12. Outer pipe; 20. Shear nails; 30. Concrete layer. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] Refer to FIG1 , which shows a schematic diagram of the structure of a spiral welded steel pipe with shear nails in an embodiment of the present application. The steel pipe 1 provided in an embodiment of the present application includes a pipe body 10, a shear nail 20 and a concrete layer 30. The pipe body 10 is formed by welding a continuous steel strip spirally rolled into a round steel strip, and there is a spiral weld between adjacent steel strips. A plurality of shear nails 20 are provided, and a plurality of the shear nails 20 are welded to the inner wall or outer wall of the pipe body 10 at intervals. The concrete layer 30 is provided on the inner wall or outer wall of the pipe body and covers the shear nails 20, and the thickness of the concrete layer 30 is higher than the height of the shear nails 20.

[0046] This application sets a combined structure of shear nails and concrete layers outside the steel pipe. The shear nails serve as effective connectors between the steel structure and the concrete, transferring the shear force and tension between the steel plate and the concrete. The shear nails can greatly strengthen the connection strength between the steel column and the concrete, improve the overall force performance of the rigid 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 more effectively transferred between the steel and the concrete, thereby enhancing the bearing capacity of the entire structure; in the steel tube concrete structure, the shear nails can strengthen the joint force 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 pushing out process of the steel tube concrete specimen with shear nails, the core concrete inside the tube will not separate from the steel tube, and the role of the shear nails is fully exerted. Its ultimate load is 1.69 to 1.73 times that of the composite beam. For the spirally welded steel tube body, the concrete layer can increase the connection strength of the tube body weld after spiral welding, achieve double bonding with the weld, improve the connection strength of the tube body itself, and make the overall strength of the steel tube have a double-effect increase.

[0047] In one embodiment, the tube body 10 may be made of a steel plate with a thickness greater than 2.5 mm.

[0048] In one embodiment, the shear nail 20 is a cylindrical head shear nail 20 or a bent shear nail 20. The overall length, head diameter or tail diameter of the shear nail 20 is related to the required diameter of the pipe body 10 or the thickness of the steel plate used for the pipe body 10, and the selection is performed. Different stress-bearing areas can be divided on the same pipe body 10, and shear nails 20 of different sizes and structures are set in different receiving areas, and corresponding concrete layers 30 are filled according to the shear nails 20.

[0049] In one embodiment, the shear studs 20 are avoided from being arranged at the spiral weld.

[0050] In one embodiment, the thickness of the concrete layer 30 is 2 mm to 10 mm higher than the height of the shear studs 20, so as to completely cover all the shear studs 20. The concrete layer 30 is arranged according to the position of the shear studs 20. Concrete includes cement, crushed stone, water, sand and water reducing agent, etc. For example, the concrete layer 30 includes 550-650 parts of cement, 50-120 parts of fly ash, 680-720 parts of machine-made sand, 750-1000 parts of crushed stone, 120-150 parts of water and water reducing agent.

[0051] In one of the embodiments, strip-shaped vertical plates are continuously arranged 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.

[0052] Specifically, the shear stud 20 is arranged adjacent to the vertical plate (not shown in the figure), and the vertical plate-shear stud-vertical plate arrangement can be adopted. The extension direction of the vertical plate is parallel to the extension direction of the steel strip, so that after the steel strip is rolled, the vertical plate is arranged in a spiral shape on the tube body 10, and the vertical plate is parallel to the spiral weld spiral.

[0053] In one embodiment, the tube body 10 includes: an outer tube 12, which is nested with each other, and a plurality of the shear nails 20 are provided at intervals on the inner wall; and an inner tube 11, which is arranged inside the outer tube 12 to form a cavity between the outer tube 12 and the inner tube 11, and a plurality of the shear nails 20 are provided at intervals on the outer wall of the inner tube 11; wherein the concrete layer 30 is arranged in the cavity.

[0054] The inner tube 11 and the outer tube 12 are spiral welded steel tubes 1 formed by welding using the same 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 arranged in the outer tube 12. Specifically, the inner tube 11 and the outer tube 12 are made of steel plates of the same thickness or different thicknesses. The shear nails 20 on the inner wall or outer wall of the inner tube 11 and the shear nails 20 on the inner wall or outer wall of the outer tube 12 can be the same or different in size and structure.

[0055] Preferably, the inner tube 11 and the outer tube 12 are the first tube body 10 and the second tube body 10 continuously produced by the same steel strip. More preferably, the outer wall of the inner tube 11 is provided with shear nails 20, and the inner wall of the outer tube 12 is provided with shear nails 20, so that all the shear nails 20 are located in the cavity.

[0056] In one embodiment, the concrete layer 30 completely fills the cavity, and the thickness of the concrete layer 30 is less than or equal to the sum of the length of the shear studs 20 of the outer tube 12 and the length of the shear studs 20 of the inner tube 11 .

[0057] In one embodiment, the thickness of the cavity is less than or equal to the sum of the length of the shear studs 20 of the outer tube 12 and the length of the shear studs 20 of the inner tube 11 .

[0058] 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.

[0059] Specifically, in the embodiment where the shear nails 20 are provided on the outer wall of the inner tube 11 and the shear nails 20 are provided on the inner wall of the outer tube 12, the concrete layer 30 fills the cavity, the shear nails 20 of the inner tube 11 and the outer tube 12 share one concrete layer 30, and the thickness of the concrete layer 30 is the thickness of the cavity (that is, the radius difference between the inner tube 11 and the outer tube 12). The concrete layer 30 may not fill the cavity, but the two sides of the concrete layer 30 are respectively attached to the wall surfaces of the outer tube 12 and the inner tube 11, in which case the shear nails 20 of the inner tube 11 and the outer tube 12 may have corresponding concrete layers 30.

[0060] Furthermore, the thickness of the concrete layer 30 (or the thickness of the cavity) is less than or equal to the sum of the length of the shear studs 20 of the outer tube 12 and the length of the shear studs 20 of the inner tube 11, so that the length 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, and 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.

[0061] Further, 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 is provided with a vertical plate, and the other abuts against the end of the vertical plate, so that the two ends of the vertical plate abut against the inner tube 11 and the outer tube 12 respectively, and the vertical plate acts as a spiral ring plate to separate a spiral cavity in the cavity, and the concrete layer is arranged in the spiral cavity. Alternatively, the height of the vertical plate is less than the thickness of the cavity, at least one of the outer wall of the inner tube and the inner wall of the outer tube is provided with a vertical plate, so that the two ends of the vertical plate separate a labyrinth-shaped cavity in the cavity, and the concrete layer is arranged in the labyrinth-shaped cavity.

[0062] Referring to FIG. 5 , the present application further provides a method for processing a spiral welded steel pipe 1 having a shear nail 20 . FIG. 5 shows a schematic flow chart of the method for processing a spiral welded steel pipe 1 having a shear nail 20 . The method comprises the following steps:

[0063] S100, welding a plurality of shear nails 20 at intervals on a continuous steel strip to form a composite steel strip;

[0064] S200, rolling the composite steel strip into a spiral shape;

[0065] S300, welding the spiral composite steel strip to form a pipe body 10 having a spiral weld;

[0066] S400 , covering the inner wall or the outer wall of the pipe body 10 with a concrete layer 30 , wherein the thickness of the concrete layer 30 is greater than the height of the shear studs 20 .

[0067] In one embodiment, in step S100, the shear pins 20 may be welded in a regular array arrangement or in an irregular plum blossom arrangement. Since the steel strip is spirally welded, the shear pins 20 may also be arranged in a spiral arrangement, so that the shear pins 20 on the rolled tube body 10 are arranged in an array in the axial and axial directions, that is, for the rolled tube body 10, a plurality of shear pins 20 in the vertical direction are distributed in an array with equal spacing along the axis of the tube body 10, and a plurality of shear pins 20 in the horizontal direction are also distributed in an array with equal spacing along the peripheral wall of the tube body 10.

[0068] As a preferred example, step S100 adopts a drawn arc stud welding method to weld shear nails 20 on the steel strip, and the shear nails 20 are arranged at a spacing of 35 cm×35 cm. The welding frequency is 12 pieces / min, the melting depth (H2) is controlled at 1 mm, the diameter D1 of the shear nail 20 is 10 mm, the height H1 of the shear nail 20 is 5 cm, the spacing D3 of the shear nails 20 is 35 cm, and the shear nails 20 are made of ordinary threaded steel.

[0069] In one embodiment, in step S100, the step of forming the composite steel strip further includes: continuously arranging strip-shaped vertical plates on the steel strip to form the composite steel strip, wherein the vertical plates are parallel to the advancing 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, the vertical plates are arranged in a spiral shape on the tube body 10, and the vertical plates are parallel to the spiral weld spiral.

[0070] In one embodiment, the step S200 of rolling the composite steel strip into a spiral shape is implemented by a rolling mechanism, and the rolling mechanism is provided with a groove for avoiding the shear nail 20. Specifically, a groove for avoiding the shear nail 20 is provided on the pressing roller of the spiral rolling mechanism, and the groove is concavely arranged on the pressing roller, and the depth of the concave corresponds to the size of the shear nail 20, and the extension direction of the groove corresponds to the rolling direction of the composite steel strip and the arrangement direction of the shear nail 20.

[0071] In one embodiment, the processing method comprises the steps of:

[0072] S101, welding a plurality of shear nails 20 at intervals on a first side of a first steel strip to form a first composite steel strip;

[0073] S102, welding a plurality of shear nails 20 at intervals on the second side of the second steel strip to form a second composite steel strip;

[0074] S201, rolling the first composite steel strip toward the first side into a spiral shape, and rolling the second composite steel strip toward the first side into a spiral shape;

[0075] S301, respectively welding the spiral first composite steel strip and the second composite steel strip to form an inner tube 11 and an outer tube 12 having a spiral weld;

[0076] S401, sleeve the outer tube 12 on the inner tube 11;

[0077] S402 , filling a concrete layer 30 between the inner tube 11 and the outer tube 12 .

[0078] Specifically, before step S100, the method further includes the step of: continuously conveying multiple steel strips to the welding mechanism. The size of each steel strip may be the same or different. When the size of each steel strip is the same, when the first composite steel strip is subsequently rolled, the smaller the diameter, the longer the tube body 10 after rolling. After step S301, the method further includes the step of cutting the length of the inner tube 11 to match the length of the outer tube 12. When the size of each steel strip is different, two adjacent steel strips form a group, the length or width of the first steel strip is smaller than that of the second steel strip, and the lengths of the first composite steel strip and the second composite steel strip are matched with each other after rolling into the inner tube 11 and the outer tube 12 according to different diameters.

[0079] The steel strip includes a first side and a second side, the first side of the steel strip is defined as the side facing upward, and the side of the steel strip contacting the conveying mechanism is defined as the second side. In the subsequent step S201 rolling process, the rolling mechanism bends and rolls the composite steel strip toward the first side.

[0080] 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 step further includes: turning the continuously conveyed first composite steel strip by 180°.

[0081] The first composite steel strip is used as the inner tube 11, and shear studs 20 need to be set on the outer wall of the inner tube 11 (i.e., the outer side when rolled). Therefore, when rolling, the first side with the shear studs 20 welded needs to be placed on the second side, so the first composite steel strip needs to be flipped over before rolling. For multiple steel strips that are continuously conveyed, two are grouped together, and the first one in each group is used as the first steel strip and the first composite steel strip to repeat this step. The second composite steel strip is used as the outer tube 12, and it needs to be on the inner wall of the outer tube 12 (i.e., the inner side when rolled). Since the welded shear studs 20 are all on the first side of the steel strip, there is no need to flip it over. The vertical plate of each of the above steel strips is set on the same side as the shear studs 20.

[0082] In one embodiment, the step S401 of sleeve-mounting the outer tube 12 on the inner tube 11 further includes: staggering the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11. Specifically, step S401 further includes adjusting the relative position 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. Furthermore, adjusting the relative position of the inner tube 11 and the outer tube 12 includes rotation and axial movement, and ultimately the shear studs 20 of the outer tube 12 and the shear studs 20 of the inner tube 11 are staggered in the axial direction and / or staggered in the cross-sectional direction of the tube body 10.

[0083] In one embodiment, in the steps S400 and S401, the step of filling the concrete layer 30 further includes the steps of:

[0084] S410, setting grouting holes and exhaust holes;

[0085] S420, inject concrete slurry from the grouting hole, and stop injecting after the slurry is discharged from the exhaust hole.

[0086] As a preferred example, the concrete can be poured in multiple times, for example, three times:

[0087] For the first pouring, a φ50mm exhaust hole and two φ100mm pouring holes are left in the middle or at the end of the outer tube 12. The delivery pump directly fills the self-compacting concrete through the pouring holes. When the concrete in the tube reaches about 30%-40%, the pump stops pouring to allow the concrete in the cavity to solidify and fix the inner tube 11 and the outer tube 12 to prevent displacement of the inner and outer tubes 12.

[0088] For the second pouring, within an interval of 2-3 hours (during the initial setting period of concrete), continue to repeat the above filling process and stop when the concrete in the tube reaches about 60-70%.

[0089] For the third pouring, after an interval of 2-3 hours, self-compacting concrete is poured through the delivery pump until concrete slurry flows out of the exhaust hole, reaching the saturated state in the casing.

[0090] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0091] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0093] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0094] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, 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 implementation method.

[0095] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0096] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A spiral welded steel pipe with shear nails, characterized in that: The steel pipe comprises: A pipe body, wherein the pipe body is formed by spirally rolling and welding continuous steel strips, and spiral welds are formed between adjacent steel strips; There are a plurality of shear nails, wherein the plurality of shear nails are welded at intervals to the inner wall or the outer wall of the pipe body; and A concrete layer is arranged on the inner wall or the outer wall of the tube body and covers the shear nails. The thickness of the concrete layer is higher than the height of the shear nails.

2. The spiral welded steel pipe with shear nails according to claim 1, characterized in that: The tube body comprises: An outer tube, the inner wall of which is provided with a plurality of said shear nails at intervals; and An inner tube is arranged inside the outer tube to form a cavity between the outer tube and the inner tube, and a plurality of shear nails are arranged at intervals on the outer wall of the inner tube; Wherein, the concrete layer is arranged in the cavity.

3. The spiral welded steel pipe with shear nails according to claim 1, characterized in that: Strip-shaped vertical plates are continuously arranged on the steel strip. After the steel strip forms the tube body, the vertical plates serve as spiral ring plates surrounding the tube body.

4. The spiral welded steel pipe with shear nails according to claim 2, characterized in that: The concrete layer fully fills the cavity, and the thickness of the concrete layer is less than or equal to the sum of the shear nail length of the outer tube and the shear nail length of the inner tube.

5. The spiral welded steel pipe with shear nails according to claim 2, characterized in that: The thickness of the cavity is less than or equal to the sum of the shear nail length of the outer tube and the shear nail length of the inner tube.

6. The spiral welded steel pipe with shear studs according to claim 2, characterized in that: The shear nails of the outer tube and the shear nails of the inner tube are arranged alternately.

7. A method for processing a spiral welded steel pipe with shear nails, characterized in that: The processing method comprises the steps of: Multiple shear nails are welded at intervals on a continuous steel strip to form a composite steel strip; Rolling the composite steel strip into a spiral shape; The spirally welded composite steel strip forms a pipe body having a spiral weld; The inner wall or the outer wall of the pipe body is covered with a concrete layer, and the thickness of the concrete layer is higher than the height of the shear nails.

8. The method for processing a spiral welded steel pipe with shear studs according to claim 7, characterized in that: The step of rolling the composite steel strip into a spiral shape is achieved by using a rolling mechanism, and the rolling mechanism is provided with grooves for avoiding the shear nails.

9. The method for processing a spiral welded steel pipe with shear studs according to claim 7, characterized in that: The step of forming the composite steel strip also includes: continuously arranging strip-shaped vertical plates on the steel strip to form the composite steel strip, wherein the vertical plates are parallel to the advancing direction of the composite steel strip during processing.

10. The method for processing a spiral welded steel pipe with shear studs according to claim 6, characterized in that: The processing method comprises the steps of: welding a plurality of shear studs at intervals on a first side of a first steel strip to form a first composite steel strip; welding a plurality of shear studs at intervals on a second side of the second steel strip to form a second composite steel strip; Rolling the first composite steel strip toward the first side into a spiral shape, and rolling the second composite steel strip toward the first side into a spiral shape; Welding the spiral first composite steel strip and the second composite steel strip respectively to form an inner tube and an outer tube having a spiral weld; Sleeve the outer tube onto the inner tube; A concrete layer is filled between the inner and outer pipes.

11. The method for processing a spiral welded steel pipe with shear studs according to claim 10, characterized in that: After the step of welding a plurality of shear nails at intervals on the second side of the second steel strip, the method further includes: turning the continuously conveyed first composite steel strip by 180 degrees.

12. The method for processing a spiral welded steel pipe with shear studs according to claim 10, characterized in that: The step of sleeve-arranging the outer tube on the inner tube further comprises: arranging the shear pins of the outer tube and the shear pins of the inner tube alternately.

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