Steel pipe joint device
The steel pipe joint device with elastic attachment members and shear keys provides efficient load transfer, addressing the inefficiencies of on-site welding and enhancing the constructability and economic viability of small-diameter steel pipe connections.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- POHANG IRON & STEEL CO LTD
- Filing Date
- 2025-12-15
- Publication Date
- 2026-06-25
AI Technical Summary
On-site welding of long steel pipes is time-consuming and costly, and there is a need for mechanical joints that can effectively transfer various loads in small-diameter steel pipes.
A steel pipe joint device comprising a first and second joint pipe with coupling holes, a shear key, and elastic band-type attachment members to securely connect and transfer loads between joint pipes.
The device allows for efficient load transfer between joint pipes, improving constructability and economic efficiency by eliminating the need for skilled welding and ensuring robust connections.
Smart Images
Figure KR2025021661_25062026_PF_FP_ABST
Abstract
Description
Steel pipe joint device
[0001] The present disclosure relates to a steel pipe joint device.
[0002] Generally, when installing steel pipes on-site, if the pipes are long, they are connected using joints formed by on-site welding.
[0003] However, in this case, skilled workers are required for welding, and it is not economically viable as welding work and quality inspection of the welds consume a significant amount of time and money.
[0004] Therefore, there is an increasing demand for mechanical joints to replace welding, and in the case of small-diameter steel pipes (e.g., diameter of 400 mm or less), there is a growing need for joints to be configured to take into account various loads (e.g., tensile load or bending load).
[0005] The present disclosure aims to provide a steel pipe joint device capable of completely transferring the load applied to the steel pipe during the connection (joining) of the steel pipe to the shear key used in joining the steel pipe and to the components (first and second joint pipes) joined thereto.
[0006] A steel pipe joint device according to one embodiment of the present disclosure may include a first joint pipe coupled to one end of a steel pipe, a second joint pipe coupled to the other end of another steel pipe for connection with the steel pipe and inserted into the first joint pipe, and a shear key inserted into the first joint pipe and the second joint pipe to connect the first joint pipe and the second joint pipe.
[0007] Additionally, the steel pipe joint device may include a first fixing part coupled to the outer side of the first joint pipe and for fixing a shear key to the first joint pipe, and a second fixing part coupled to the inner side of the second joint pipe and for fixing a shear key to the second joint pipe.
[0008] The first joint tube and the second joint tube may be provided with a first coupling hole and a second coupling hole for inserting and coupling a shear key.
[0009] In addition, a plurality of first connecting holes may be provided along the outer surface of the first joint tube, and a plurality of second connecting holes may be provided along the outer surface of the second joint tube.
[0010] And, the first fixing member may include a first attachment member for attaching to the outer surface of the first joint tube, and a first fixing member coupled to the first attachment member and for fixing the first attachment member to the first joint tube.
[0011] In addition, the first attachment member may be formed as a band-type structure having elasticity of a set size.
[0012] The first attachment member can be divided into at least two or more parts.
[0013] The first attachment member may have a curved shape having a curvature corresponding to the curvature of the first joint tube.
[0014] And, the second fixing member may include a second attachment member for attaching to the inner surface of the second joint tube, and a second fixing member coupled to the second attachment member and for fixing the second attachment member to the second joint tube.
[0015] In addition, the second attachment member may be formed as a band-type structure having elasticity of a set size.
[0016] The second attachment member can be divided into at least two or more parts.
[0017] In addition, the second attachment member may have a curved shape having a curvature corresponding to the curvature of the second joint tube.
[0018] A step may be provided on the outer surface of one end of the second joint tube to allow the other end of the first joint tube to be seated and contacted.
[0019] On the outer surface of the first joint tube, a seating groove may be provided for the first attachment member to be seated when the first attachment member is coupled to the outer surface of the first joint tube.
[0020] The first joint pipe and the second joint pipe can be formed in a cylindrical shape corresponding to the shape of the steel pipe.
[0021] The inner diameter of the first joint pipe can have the same size as the inner diameter of the steel pipe.
[0022] In addition, the outer diameter of the second joint tube may have the same size as the inner diameter of the first joint tube.
[0023] The outer diameter of the step can have the same size as the outer diameter of the first joint tube.
[0024] According to an embodiment of the present disclosure, when joining (joining) steel pipes using a shear key, the load applied to the steel pipe can be completely transferred to the parts (joint pipes) joined to the shear key used for joining the steel pipes.
[0025] Therefore, the constructability and economic efficiency of joining steel pipes can be improved through the mechanical joint method.
[0026] FIG. 1 is a schematic partial perspective view of a steel pipe joint device according to one embodiment of the present disclosure, showing the state before the first joint pipe and the second joint pipe are joined.
[0027] FIG. 2 is a schematic partial perspective view of a steel pipe joint device according to one embodiment of the present disclosure, showing the combined state of the first joint pipe and the second joint pipe, and the state before the connection of the shear key.
[0028] FIG. 3 is a schematic partial perspective view of a steel pipe joint device according to one embodiment of the present disclosure, showing the combined state of the first joint pipe and the second joint pipe, and the state when the shear key is connected.
[0029] FIG. 4 is a schematic cross-sectional view showing the combined state of a steel pipe joint device according to one embodiment of the present disclosure.
[0030] FIG. 5 is a schematic partially exploded perspective view showing the combined state of the first joint pipe and the second joint pipe of a steel pipe joint device according to one embodiment of the present disclosure.
[0031] FIG. 6 is a partial perspective view showing the combined state of the first joint pipe of a steel pipe joint device according to one embodiment of the present disclosure.
[0032] FIG. 7 is a schematic diagram illustrating the tensile force transmission mechanism of a steel pipe joint device according to one embodiment of the present disclosure.
[0033] FIG. 8 is a schematic diagram illustrating the compressive force transmission mechanism of a steel pipe joint device according to one embodiment of the present disclosure.
[0034] Hereinafter, embodiments of the present invention are described with reference to the attached drawings so that those skilled in the art can easily implement the present invention. As will be easily understood by those skilled in the art, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible, identical or similar parts are indicated using the same reference numerals in the drawings.
[0035] The technical terms used below are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. The meaning of "comprising" as used in the specification specifies a particular characteristic, area, integer, step, action, element, and / or component, and does not exclude the presence or addition of other particular characteristic, area, integer, step, action, element, component, and / or group.
[0036] All terms used below, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms defined in advance are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined.
[0037] FIG. 1 is a schematic partial perspective view of a steel pipe joint device according to one embodiment of the present disclosure.
[0038] Referring to FIG. 1, a steel pipe joint device according to one embodiment of the present disclosure includes a first joint pipe (100) and a second joint pipe (200).
[0039] The first joint pipe (100) can be connected to one end (the lower end in FIG. 1) of the steel pipe (10).
[0040] Additionally, the second joint pipe (200) is connected to the other end (upper end in FIG. 1) of another steel pipe (10) for connection with the steel pipe (10), and can be inserted and connected to the first joint pipe (100).
[0041] The first joint pipe (100) and the second joint pipe (200) may have shapes corresponding to the shape of the steel pipe (10). For example, in this embodiment, as the steel pipe (10) is formed in a cylindrical shape, the first joint pipe (100) and the second joint pipe (200) are also formed in a cylindrical shape. Of course, the present disclosure is not limited thereto, and for example, if the steel pipe (10) is in the shape of a square tube, the first joint pipe (100) and the second joint pipe (200) may also be formed in the shape of a square tube.
[0042] The inner diameter of the first joint pipe (100) may have the same size as the inner diameter of the steel pipe (10) so that when the first joint pipe (100) is connected to the steel pipe (10), the inner surface of the first joint pipe (100) and the inner surface of the steel pipe (10) match.
[0043] The first joint pipe (100) can be fixedly connected to one end of the steel pipe (10) by welding or the like.
[0044] The second joint pipe (200) can be fixedly connected to the other end of another steel pipe (10) by welding or the like.
[0045] The second joint tube (200) may have an outer diameter equal to the inner diameter of the first joint tube (100) so that the first joint tube (100) can be easily inserted and firmly joined.
[0046] Additionally, the second joint tube (200) may have the same diameter center as the first joint tube (100) so that the first joint tube (100) can be easily inserted and coupled.
[0047] FIG. 2 illustrates a state in which the second joint tube (200) is inserted into the inner side of the first joint tube (100) and the two steel tubes (10) are joined.
[0048] In addition, the steel pipe joint device of the embodiment includes a shear key (300) as shown in FIG. 3.
[0049] The shear key (300) can connect the first joint pipe (100) and the second joint pipe (200) by being inserted and coupled to the first joint pipe (100) and the second joint pipe (200). To this end, the first joint pipe (100) and the second joint pipe (200) each include a first coupling hole (101) and a second coupling hole (201).
[0050] The first joint hole (101) can be formed through the circumferential surface of the first joint tube (100), and in this embodiment, a plurality of them are formed at intervals set in the circumferential direction on the circumferential surface of the first joint tube (100).
[0051] For example, the first connecting holes (101) are provided in six numbers at intervals of 60 degrees along the circumference of the first joint tube (100), but are not limited thereto and may be provided in fewer than six or more than six numbers as needed.
[0052] This first coupling hole (101) is set to a size into which the shear key (300) can be easily inserted, and of course, its size can be adjusted according to the size of the shear key (300).
[0053] The second coupling hole (201) provided in the second joint tube (200) can also be provided in the same way.
[0054] That is, the second joint hole (201) can be formed through the circumferential surface of the second joint tube (200). In this embodiment, a plurality of holes are formed at intervals set along the circumferential direction on the circumferential surface of the second joint tube (200).
[0055] For example, the second connecting holes (201) are provided in six numbers at intervals of 60 degrees along the circumference of the first joint tube (200), but are not limited thereto and may be provided in fewer than six or more than six numbers as needed.
[0056] This second coupling hole (201) is set to a size into which the shear key (300) can be easily inserted, and, of course, can be adjusted according to the size of the shear key (300). The second coupling hole (201) may have the same size as the first coupling hole (101) so that the shear key (300) can be inserted more easily.
[0057] FIG. 4 is a cross-sectional view along line IV-IV of FIG. 3. The steel pipe joint device of the embodiment includes a first fixing part (400) that is coupled to the outside of the first joint pipe (100) and can fix a shear key (300) to the first joint pipe (100).
[0058] Additionally, the steel pipe joint device of the embodiment includes a second fixing part (500) that is coupled to the inside of the second joint pipe (200) and can fix the shear key (300) to the second joint pipe (200).
[0059] The first fixing part (400) may include a first attachment member (410) and a first fixing member (420).
[0060] The first attachment member (410) can be attached to the outer surface of the first joint tube (100) by being positioned on the outer side of the first joint tube (100) in a manner that wraps around the outer surface of the first joint (100). Here, the first attachment member (410) may be formed as a band-type structure having elasticity of a set size so that it can be easily attached to the outer surface of the first joint tube (100).
[0061] Additionally, the first attachment member (410) is formed in a curved shape having a curvature corresponding to the curvature of the outer surface of the first joint tube (100) so that it can be more easily attached to the outer surface of the first joint (100), and can be divided into two or more parts as shown in FIG. 5.
[0062] When the first attachment member (410) is divided into two or more parts, it may be divided into the same length or different lengths depending on the situation in which it is attached.
[0063] The first fixing member (420) is coupled to the first attachment member (410) to fix the first attachment member (410) to the first joint pipe (100). To this end, the first attachment member (410) and the first joint pipe (100) may be provided with a third coupling hole (not shown) for coupling with the first fixing member (420).
[0064] In this case, the first fixing member (420) may be formed of a first bolt, etc., for connecting to the third coupling hole to securely connect the first attachment member (410) to the first joint tube (100).
[0065] As illustrated in FIG. 4, the second fixing part (500) may include a second attachment member (510) and a second fixing member (520).
[0066] The second attachment member (510) can be attached to the inner surface of the second joint tube (200) by being positioned on the inner side of the second joint tube (200) in a manner that wraps around the inner surface of the second joint tube (200). In the same way, the second attachment member (510) can also be formed as a band-type structure having elasticity of a set size so that it can be easily attached to the inner surface of the second joint tube (200).
[0067] Additionally, the second attachment member (510) is formed in a curved shape having a curvature corresponding to the curvature of the inner surface of the second joint tube (200) so that it can be more easily attached to the inner surface of the second joint (200), and can be divided into two or more parts, just like the first attachment member (410).
[0068] When the second attachment member (510) is divided into two or more parts, it may be divided into the same length or different lengths depending on the situation in which it is attached.
[0069] The second fixing member (520) is coupled to the second attachment member (510) to securely connect the second attachment member (510) to the second joint pipe (200). To this end, the second attachment member (510) and the second joint pipe (200) may be provided with a fourth coupling hole (not shown) for coupling with the second fixing member (520). In this case, the second fixing member (520) may be composed of a second bolt, etc., for coupling to the fourth coupling hole to securely connect the second attachment member (510) to the second joint pipe (200).
[0070] Additionally, a step (210) may be provided on the outer surface of one end (lower end in FIG. 1) of the second joint tube (200) so that the other end (lower end in FIG. 1) of the first joint tube (100) may be seated and contacted (see FIG. 1 and FIG. 2).
[0071] The outer diameter of the step (210) may have the same size as the outer diameter of the first joint tube (100) so that the outer surface of the step (210) matches the outer surface of the first joint tube (100).
[0072] As illustrated in FIG. 5, the outer surface of the first joint tube (100) may be provided with a seating groove (110) for the first attachment member (500) to be seated so that when the first attachment member (410) of the first fixing part (400) is coupled (e.g., bolted) to the outer surface of the first joint tube (100), the outer surface of the first attachment member (410) and the outer surface of the first joint tube (100) form the same plane.
[0073] The first coupling hole (101) of the first joint tube (100) and the second coupling hole (201) of the second joint tube (200) described above can be arranged within the seating groove (110).
[0074] Hereinafter, with reference to FIGS. 1 to 6, the operation of a steel pipe joint device according to one embodiment of the present disclosure will be described.
[0075] For example, the shear key (300) can be used by cutting a wire (corresponding to the body of the bolt) used for high-strength bolts to a set length. The wire has a high tensile strength (e.g., 1000 MPa or more). In addition, the first joint pipe (100) and the second joint pipe (200) are forged products and have a high tensile strength (e.g., 800 MPa or more) corresponding to the shear key (300).
[0076] Before the shear key (300) is connected to the first joint pipe (100) and the second joint pipe (200), the first joint pipe (100) is fixed in advance to one end of the steel pipe (10) and the second joint pipe (200) is fixed to the other end of the other steel pipe (10) by welding or the like.
[0077] Afterwards, the second joint tube (200) is inserted into the first joint tube (100) to join the two so that one end (lower end in Fig. 1) of the first joint (100) comes into contact with the step (201) of the second joint tube (200). At this time, the first joint tube (100) and the first connecting hole (101) and the second connecting hole (210) of the second joint tube (200) are aligned so that they penetrate each other.
[0078] In this state, the shear key (300) is inserted and coupled into the first coupling hole (101) of the first joint tube (100) and the second coupling hole (201) of the second joint tube (200).
[0079] That is, after inserting and connecting the shear key (300) into the first connecting hole (101) and the second connecting hole (201) from the outside of the first joint tube (100), the second attachment member (510) is attached while covering the inner surface of the second joint tube (200). At this time, the second attachment member (510) is fixedly connected to the second joint tube (200) by the second fixing member (520).
[0080] Additionally, the first attachment member (410) is attached while covering the outer surface of the first joint tube (100). At this time, the first attachment member (410) is fixedly coupled to the first joint tube (100) by the first fixing member (420).
[0081] Referring to FIG. 7, when a tensile force is applied to a steel pipe (10), a tensile force transmission mechanism of a steel pipe joint device according to one embodiment of the present disclosure is described.
[0082] When a tensile force is applied to the steel pipe (10) in the upper and lower directions (Y direction in Fig. 7) as indicated by the arrow in Fig. 7, a shear force is applied to the shear key (300), and this shear force is transmitted to the first joint pipe (100) and the second joint pipe (200) through pressure.
[0083] That is, the shear force applied to the outer end of the shear key (300) is transmitted to the contact portion of the first joint pipe (100) connected to the outer end of the shear key (300), and a tensile force is applied downward to the steel pipe (10) as shown by the arrow in Fig. 7 at the contact portion of the first joint pipe (100).
[0084] Additionally, the shear force acting on the inner end of the shear key (300) is transmitted to the second joint pipe (200) connected to the inner end of the shear key (300), and a tensile force is applied upward to the steel pipe (10) as shown by the arrow in Fig. 7 at the contact portion of the second joint pipe (200).
[0085] In this way, the tensile force applied to the steel pipe (10) can be transmitted to the shear key (300) and then completely transmitted to the first joint pipe (100) and the second joint pipe (200).
[0086] Referring to FIG. 8, when a compressive force is applied to a steel pipe (10), a compressive force transmission mechanism of a steel pipe joint device according to one embodiment of the present disclosure is described.
[0087] When a compressive force is applied to the steel pipe (10) in the upward and downward directions (Y direction in Fig. 8) as indicated by the arrow in Fig. 8, this compressive force is transmitted to the contact portion between the first joint pipe (100) and the second joint pipe (200) through direct pressure.
[0088] That is, the compressive force of the steel pipe (10) is transmitted to the contact portion of the step (210) between the first joint pipe (100) and the second joint pipe (200), and the compressive force is applied upward to the steel pipe (10) at the contact portion of the first joint pipe (100) as shown by the arrow in Fig. 8.
[0089] A compressive force is applied downward to the steel pipe (10) as shown by the arrow in Fig. 8 at the contact portion of this second joint pipe (200).
[0090] In this way, the compressive force applied to the steel pipe (10) can be completely transferred to the first joint pipe (100) and the second joint pipe (200).
[0091] Considering such a load (including tensile force, compressive force, etc.) transfer mechanism, the quantity of shear keys (300) and the dimensions of the first joint pipe (100) and the second joint pipe (200) can be determined.
[0092] Although the present disclosure has been described through preferred embodiments as described above, those skilled in the art will readily understand that the present disclosure is not limited thereto and that various modifications and variations are possible without departing from the scope of the claims set forth below.
[0093] [Explanation of the symbol]
[0094] 10: Steel pipe
[0095] 100: 1st joint pipe
[0096] 200: 2nd joint pipe
[0097] 300: Shear key
[0098] 400: First fixed part
[0099] 500: Second fixed part
Claims
1. A first joint pipe connected to one end of a steel pipe, A second joint pipe that is coupled to the other end of another steel pipe for connection with the above steel pipe and inserted and coupled to the first joint pipe, A shear key that is inserted and coupled to the first joint tube and the second joint tube to connect the first joint tube and the second joint tube, A first fixing part coupled to the outer side of the first joint tube and for fixing the shear key to the first joint tube, and A second fixing part coupled to the inner side of the second joint tube and for fixing the shear key to the second joint tube. A steel pipe joint device including 2. In Paragraph 1, A steel pipe joint device in which the first joint pipe and the second joint pipe are each provided with a first coupling hole and a second coupling hole for inserting and coupling the shear key.
3. In Paragraph 2, A steel pipe joint device in which the first coupling holes are provided in plurality along the outer surface of the first joint pipe, and the second coupling holes are provided in plurality along the outer surface of the second joint pipe.
4. In any one of paragraphs 1 through 3, The above-mentioned first fixing part is, A first attachment member for attaching to the outer surface of the first joint tube, and A steel pipe joint device comprising a first fixing member coupled to the first attachment member and for fixing the first attachment member to the first joint pipe.
5. In Paragraph 4, The above-mentioned first attachment member is a steel pipe joint device having elasticity of a set size and formed as a band-type structure.
6. In Paragraph 5, A steel pipe joint device in which the first attachment member is divided into at least two or more parts.
7. In Paragraph 6, A steel pipe joint device in which the first attachment member has a curved shape having a curvature corresponding to the curvature of the first joint pipe.
8. In Paragraph 4, The above second fixed part is, A second attachment member for attaching to the inner surface of the second joint tube, and A steel pipe joint device comprising a second fixing member coupled to the second attachment member and for fixing the second attachment member to the second joint pipe.
9. In Paragraph 8, The above-mentioned second attachment member is a steel pipe joint device having elasticity of a set size and formed as a band-type structure.
10. In Paragraph 9, A steel pipe joint device in which the second attachment member is divided into at least two or more parts.
11. In Paragraph 10, The above second attachment member is a steel pipe joint device having a curved shape with a curvature corresponding to the curvature of the above second joint pipe.
12. In Paragraph 8, A steel pipe joint device having a step provided on the outer surface of one end of the second joint pipe for the other end of the first joint pipe to be seated and contacted.
13. In Paragraph 4, A steel pipe joint device having a seating groove on the outer surface of the first joint pipe for the first attachment member to be seated when the first attachment member is coupled to the outer surface of the first joint pipe.
14. In Paragraph 1, A steel pipe joint device in which the first joint pipe and the second joint pipe are formed in a cylindrical shape corresponding to the shape of the steel pipe.
15. In Paragraph 12, A steel pipe joint device in which the inner diameter of the first joint pipe has the same size as the inner diameter of the steel pipe.
16. In Paragraph 15, A steel pipe joint device having the same size as the inner diameter of the second joint pipe.
17. In Paragraph 16, A steel pipe joint device having the same size as the outer diameter of the above-mentioned step as the outer diameter of the first joint pipe.