A conical sleeve lock nut type steel bar connecting sleeve and its connecting method

Abstract

The present invention discloses a taper sleeve lock nut type steel bar connecting sleeve and a connecting method thereof. In the connecting sleeve, a taper plug is matched with an inner taper hole. A steel bar is connected in the taper plug, and a steel bar is connected in a connecting nut. The connecting nut is threadedly connected in an adjusting sleeve. By rotating the adjusting sleeve, the taper plug is pushed to move radially along the conical surface of the inner taper hole, thereby adjusting and straightening the steel bar in the taper plug. At the same time, the end surface of the conical surface on the adjusting sleeve abuts against the steel bar after adjusting and straightening, which can compress the steel bar and improve the tensile strength of the steel bar. The adjusting sleeve always moves along the center line of the sleeve, so that the connection of the connected steel bars has better connection centering and is convenient to adjust. The taper of the conical surface on the taper plug is smaller than the taper of the abutting part on the adjusting sleeve, which can improve the adjustment efficiency and at the same time improve the centering of the connected steel bars. The connecting sleeve of the steel bar has high connecting strength and good connection centering, avoids thread exposure, improves the engineering quality and efficiency, the joint is firm and reliable, and is energy-saving and environment-friendly.

Description

Technical Field

[0001] The present invention relates to the field of auxiliary equipment for building reinforcement members, and particularly to a tapered sleeve lock nut type steel bar connecting sleeve and a connecting method thereof. Background Art

[0002] Compared with traditional welding connections and binding connections, the mechanical connection sleeve connection technology has the advantages of high reliability, convenient installation, wide applicability, etc. when connecting steel bars. Therefore, the steel bar connecting sleeve is widely used in precast concrete components and is an important component for connecting on-site steel bars. The use of mechanical connection sleeves avoids lap welding and promotes the development of low-carbon environmental protection. However, during the process of mechanical sleeve connection, problems such as deviation of steel bar connection, exposed threads, and insecure connection often occur, resulting in unqualified tensile strength of the connected steel bars. Therefore, rework and adjustment are required, which seriously affects the project quality and progress. Therefore, it is necessary to design a steel bar connecting sleeve that can automatically adjust the deviation, has good connection centering, and high connection strength. Summary of the Invention

[0003] The object of the present invention is to provide a steel bar connecting sleeve that can automatically adjust and straighten the deviation, has good connection centering, is convenient for installation and adjustment, and has high connection strength for the problems existing in the prior art. This steel bar connecting sleeve can automatically adjust and straighten the connected steel bars during the installation process through the tapered surface; it is convenient for adjustment by setting an adjusting nut; through the mutual connection of multiple threads and the setting of a locking component, this steel bar connecting sleeve has high connection strength and good connection centering, avoids exposed threads, improves the project quality and efficiency, has a firm and reliable joint, is energy-saving and environmentally friendly, and is the most ideal solution to solve the technical problems in the above background.

[0004] To achieve the above object, the technical solution adopted by the present invention provides a taper sleeve lock nut type steel bar connecting sleeve. The steel bar connecting sleeve includes a screw sleeve, a taper plug, an adjusting screw sleeve, a locking member, and a connecting screw sleeve. One end of the screw sleeve is provided with an inner taper hole, and the other end of the screw sleeve is provided with a first internal thread hole. The inner taper hole is connected with a taper plug, and the first internal thread hole is threadedly connected with an adjusting screw sleeve; a second internal thread hole is provided at the center of the taper plug, and a steel bar is threadedly connected to the second internal thread hole. A first tapered surface at one end of the taper plug cooperates with the inner taper hole of the screw sleeve; the adjusting screw sleeve includes a first main body portion, an abutting portion, and a third internal thread hole. The outer surface of the first main body portion is provided with threads, and the main body portion is threadedly connected to the first internal thread hole; the end surface of the abutting portion abuts against one end of the steel bar in the taper plug, and a connecting screw sleeve is threadedly connected to the third internal thread hole; the connecting screw sleeve includes a second main body portion and a fourth internal thread hole. The outer surface of the second main body portion is provided with threads, and the second main body portion is threadedly connected to the third internal thread hole, and a steel bar is threadedly connected to the fourth internal thread hole; a locking member, the locking member is threadedly connected to the threads on the second main body portion of the connecting screw sleeve. In the locked state, one end of the locking member abuts against the end of the screw sleeve.

[0005] Through the above technical solution, one end of the screw sleeve of the steel bar connecting sleeve is provided with an inner taper hole, the taper plug cooperates with the inner taper hole, a steel bar is connected in the taper plug, the abutting portion on the adjusting screw sleeve abuts against the end surface of the steel bar in the taper plug, a steel bar is connected in the connecting screw sleeve, the connecting screw sleeve is threadedly connected in the adjusting screw sleeve. By rotating the adjusting screw sleeve, the taper plug is pushed to move radially along the tapered surface of the inner taper hole, thereby adjusting and straightening the steel bar in the taper plug; at the same time, by positioning the end surface of the abutting portion on the adjusting screw sleeve at the positioning position and abutting against the adjusted and straightened steel bar, the steel bar can be pressed tightly to improve the tensile strength of the steel bar; at the same time, through the threaded adjustment of the adjusting screw sleeve, the adjusting screw sleeve always moves along the center line of the screw sleeve, so that the connection of the connected steel bars has good connection centering and is convenient to adjust; finally, through the mutual connection between multiple threads and the setting of locking components, the steel bar connecting sleeve has high connection strength and good connection centering, avoids exposed threads, improves the project quality and efficiency, the joint is firm and reliable, and is energy-saving and environment-friendly.

[0006] As a further improvement of the above technical solution, the screw sleeve is a cylindrical sleeve, and an inner taper hole is provided inside one end of the screw sleeve away from the locking member. The first tapered surface at one end of the taper plug cooperates with the tapered surface of the inner taper hole of the screw sleeve.

[0007] As a further improvement of the above technical solution, the locking member is a locking nut.

[0008] As a further improvement of the above technical solution, the taper plug is conical, the bottom end of the cone is octagonal, and the second internal thread hole is a threaded through hole.

[0009] As a further improvement to the above technical solution, the abutting portion is arranged as a conical surface, and the end surface of the end of the abutting portion away from the locking member is an octagon.

[0010] As a further improvement to the above technical solution, the outer surface of the second main body portion of the connecting sleeve is entirely provided with threads, and the threads on the outer surface of the second main body portion are threadedly connected to the locking nut. One end of the second main body portion close to the locking nut is an octagon.

[0011] As a further improvement to the above technical solution, a fifth internal threaded hole is provided at the center of the locking nut, and the fifth internal threaded hole is threadedly connected to the threads on the outer surface of the second main body portion. The end surface of the locking nut is an octagon.

[0012] As a further improvement to the above technical solution, the helix direction of the threads on the surface of the first main body portion is opposite to the helix direction of the threads on the surface of the second main body portion.

[0013] As a further improvement to the above technical solution, the taper of the conical surface of the cone plug is smaller than the taper of the abutting portion on the adjusting sleeve.

[0014] As a further improvement to the above technical solution, the conical surface of the inner conical hole of the sleeve is arranged on the inner wall of the end surface away from the locking member.

[0015] The present invention also provides a connection method for a taper sleeve locking nut type steel bar connecting sleeve. The connection method includes the following steps: Step 1: Sleeve the sleeve; first sleeve the sleeve on the steel bar with a threaded section. Step 2: Install the cone plug into the steel bar; connect the cone plug to the threaded end of the steel bar and tighten it. Step 3: Sleeve the locking member and install the steel bar into the connecting sleeve; sleeve the locking member on the other steel bar to be connected, connect the connecting sleeve to the other steel bar with a threaded section, and tighten it. Step 4: Install the adjusting sleeve; screw the adjusting sleeve into the connecting sleeve. Step 5: Move the steel bars to a fixed position; move the two steel bars with the joint assemblies already installed to a relatively fixed position. Step 6: Adjust the adjusting sleeve; rotate the adjusting sleeve so that it moves axially along the external threads of the connecting sleeve, and make the abutting portion in front of the adjusting sleeve tightly abut against the end surface of the other steel bar. Step 7: Install the sleeve; move the sleeve in the reverse direction so that it is screwed onto the external threads of the adjusting sleeve and tighten the sleeve. Step 8: Lock the connecting sleeve; screw the locking member onto the external threads of the connecting sleeve so that the end surface of the locking member contacts the end surface of the sleeve, and tighten the locking member after rotating it in place. The installation is completed.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] One end of the sleeve of the reinforcing bar connecting sleeve is provided with an internal tapered hole, and the tapered plug is matched with the internal tapered hole. A reinforcing bar is connected in the tapered plug. The tapered surface on the adjusting sleeve is adjusted to be in contact with the end surface of the reinforcing bar in the tapered plug. A reinforcing bar is connected in the connecting sleeve, and the connecting sleeve is threadedly connected in the adjusting sleeve. By rotating the adjusting sleeve, the tapered plug is pushed to move radially along the tapered surface of the internal tapered hole, so as to adjust and straighten the reinforcing bar in the tapered plug. At the same time, by positioning the end surface of the tapered surface on the adjusting sleeve, it is in contact with the adjusted and straightened reinforcing bar, which can press the reinforcing bar and improve the tensile strength of the reinforcing bar. At the same time, through the threaded adjustment of the adjusting sleeve, the adjusting sleeve always moves along the center line of the sleeve, so that the connection of the connected reinforcing bars has better connection centering and is convenient to adjust. The taper of the tapered surface on the tapered plug is smaller than the taper of the abutting part on the adjusting sleeve, which can improve the adjustment efficiency and the centering of the connected reinforcing bars. Finally, through the mutual connection of multiple threads and the setting of locking components, the connecting strength of the reinforcing bar connecting sleeve is high and the connection centering is good, avoiding exposed threads, improving the project quality and efficiency, the joint is firm and reliable, and energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional structure view of the tapered sleeve lock nut type reinforcing bar connecting sleeve in this embodiment;

[0019] Figure 2 is a schematic view of the structure of the tapered plug in this embodiment;

[0020] Figure 3 is a right view schematic diagram of the tapered plug in this embodiment;

[0021] Figure 4 is Figure 3 a schematic cross-sectional view taken along line A-A in

[0022] Figure 5 is a schematic structure view of the connecting sleeve in this embodiment;

[0023] Figure 6 is a schematic cross-sectional view of the connecting sleeve in this embodiment;

[0024] Figure 7 is a schematic structure view of the adjusting sleeve in this embodiment;

[0025] Figure 8 is a schematic cross-sectional view of the adjusting sleeve in this embodiment;

[0026] Figure 9 is a schematic structure view of the sleeve in this embodiment;

[0027] Figure 10 is a schematic cross-sectional view of the sleeve in this embodiment;

[0028] Figure 11 is a flow chart of the connection method of the tapered sleeve lock nut type reinforcing bar connecting sleeve;

[0029] In the figure: 1. Sleeve; 2. Tapered plug; 3. Adjusting sleeve; 4. Locking nut; 5. Connecting sleeve; 6. Steel bar; 7. Tapered plug body; 8. Contact part; 9. Second internal threaded hole; 10. Second main body part; 11. Fourth internal threaded hole; 12. First main body part; 13. Contact part; 14. Third internal threaded hole; 15. Sleeve body; 16. First internal threaded hole; 17. Internal tapered hole. Specific implementation mode

[0030] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] As Figures 1 - 10 shown, this embodiment provides a tapered sleeve lock nut type steel bar connecting sleeve. The steel bar connecting sleeve includes a sleeve 1, a tapered plug 2, an adjusting sleeve 3, a locking member, and a connecting sleeve 5. The sleeve 1 is cylindrical. One end of the inner cavity of the sleeve is provided with an internal tapered hole 17, and the other end of the inner cavity of the sleeve is provided with a first internal threaded hole 16. A tapered plug 2 is connected in the internal tapered hole 17, and an adjusting sleeve 3 is threadedly connected to the first internal threaded hole 16; the tapered plug 2 is conical, and a second internal threaded hole 9 is provided at the center of the tapered plug 2, and a steel bar 6 is threadedly connected in the second internal threaded hole 9. As Figure 1 shown, the conical surface of the tapered plug 2 is matched with the inner conical surface of the internal tapered hole 17 of the sleeve. As Figure 7 shown, the adjusting sleeve 3 consists of a first main body part 12, a contact part 13, and a third internal threaded hole 14. The outer surface of the first main body part 12 is provided with threads, and the first main body part 12 is threadedly connected to the first internal threaded hole 16; the end surface of the contact part 13 abuts against one end surface of the steel bar in the tapered plug 2, and a connecting sleeve 5 is threadedly connected in the third internal threaded hole 14; as Figures 5 - 6 shown, the connecting sleeve 5 consists of a second main body part 10 and a fourth internal threaded hole 11. The outer surface of the second main body part 10 is provided with threads, and the second main body part 10 is threadedly connected to the third internal threaded hole 14, and a steel bar 6 is threadedly connected in the fourth internal threaded hole 11; the locking member is threadedly connected to the second main body part 10 of the connecting sleeve 5. Preferably, the locking member can be set as a locking nut 4, and the locking nut 4 is threadedly connected to the second main body part 10 of the connecting sleeve 5. In the locked state, one end of the locking member abuts against the end of the sleeve 1, so that the steel bar is more firmly fixed in the sleeve, improving the tensile strength and connection strength of the steel bar.

[0033] In the above technical solution, one end of the screw sleeve 1 is provided with an internal tapered hole 17, the tapered surface of the tapered plug 2 is matched with the tapered surface of the internal tapered hole 17, a steel bar 6 is threadedly connected in the tapered plug 2, the abutting portion on the adjusting screw sleeve 3 abuts against the end face of the steel bar in the tapered plug 2, and a steel bar 6 to be connected at the other end is threadedly connected in the connecting screw sleeve 5. The connecting screw sleeve 5 is threadedly connected in the adjusting screw sleeve 3. By rotating the adjusting screw sleeve 3, the tapered plug 2 is pushed to move in the radial direction of the steel bar along the tapered surface of the internal tapered hole, thereby radially adjusting and straightening the steel bar in the tapered plug 2. At the same time, by positioning the end face of the abutting portion on the adjusting screw sleeve 3 in the positioning position and abutting against the steel bar after adjusting and straightening, the steel bar can be compressed to improve the tensile strength of the steel bar. At the same time, through the threaded adjustment of the adjusting screw sleeve, the adjusting screw sleeve 3 always moves along the center line of the screw sleeve 1, so that the connection of the connected steel bars 6 has better connection centering and is convenient to adjust. Finally, through the mutual connection between multiple threads and the setting of locking components, the connection strength of the steel bar connecting sleeve is high, the connection centering is good, the thread exposure is avoided, the project quality and efficiency are improved, the joint is firm and reliable, and energy conservation and environmental protection are achieved.

[0034] Further, in some embodiments, the screw sleeve 1 is in the form of a cylindrical sleeve, an internal tapered hole 17 is provided inside one end of the screw sleeve 1 away from the locking nut 4, and the tapered surface on the tapered plug 2 is matched with the tapered surface of the internal tapered hole 17 of the screw sleeve 1.

[0035] Further, in some embodiments, the tapered plug 2 is set to be conical, the conical bottom end face of the tapered plug 2 is octagonal, and the second internal threaded hole 9 penetrates through the tapered plug body 7, and the threaded end of the steel bar 6 can be threadedly connected in the second internal threaded hole 9.

[0036] Further, in some embodiments, the abutting portion 8 of the adjusting screw sleeve 3 is set to be a tapered surface, and the end face of the abutting portion 8 away from the locking nut 4 is set to be octagonal.

[0037] Further, in some embodiments, threads are provided throughout on the outer surface of the second main body portion 10 of the connecting screw sleeve 5, the external threads on the second main body portion 10 are threadedly connected with the locking nut 4, and one end of the second main body portion 10 close to the locking nut 4 is octagonal.

[0038] Further, in some embodiments, a fifth internal threaded hole is provided at the center of the locking nut 4, the fifth internal threaded hole is connected with the external threads on the second main body portion 10, and the end face of the locking nut 4 is set to be octagonal.

[0039] Further, in some embodiments, in order to improve the convenience and stability of connection, the helix direction of the threads on the surface of the first main body portion 12 can be set to be opposite to the helix direction of the threads on the surface of the second main body portion 10. Preferably, the helix direction of the threads on the surface of the first main body portion 12 can be left-handed, and the helix direction of the threads on the surface of the second main body portion 10 can be set to be right-handed.

[0040] Further, in some embodiments, the taper of the conical surface on the conical plug 2 is smaller than the taper of the abutting portion on the adjusting sleeve. With such a setting, the adjustment efficiency can be improved, and at the same time, the centering of the connected steel bars can be enhanced.

[0041] Embodiment 2:

[0042] This embodiment provides a method for using the conical sleeve lock nut type steel bar connecting sleeve in the embodiment, as Figure 11 shown, which specifically includes the following steps:

[0043] Step 1: First, sleeved the sleeve 1 onto the steel bar with a threaded section; Step 2: Screw the conical plug 2 into the threaded end of the steel bar and tighten it; Step 3, screw the locking nut 4 onto the other steel bar to be connected, screw the connecting sleeve 5 onto the other steel bar with a standard thread and tighten it; Step 4, screw the adjusting sleeve 3 into the connecting sleeve 5; Step 5, move the two steel bars with the joint assemblies already installed to a relatively fixed position; Step 6, rotate the adjusting sleeve 3 so that it axially moves on the external thread of the connecting sleeve 5 and make the conical front end face on the abutting portion 8 in front of the adjusting sleeve 3 tightly abut against the end face of the other steel bar; Step 7, move the sleeve 1 in the reverse direction so that it screws into the external thread on the adjusting sleeve 3 and tighten the sleeve 1; Step 8, screw the locking nut 4 onto the external thread of the connecting sleeve 5 so that the end face of the locking nut 4 contacts the end face of the sleeve 1. After rotating it in place, tighten the lock nut, and the tightening torque shall not be less than the torque value requirements in Table 1 below, and the installation is completed.

[0044] Diameter of steel bar 20～25 28～32 36～40 Tightening torque value (N·m) 260 320 360

[0045] Table 1

[0046] In addition, this embodiment also conducts a comparative experiment on the performance of the conical sleeve lock nut type steel bar connecting sleeve in Embodiment 1. The steel bar base material used in the experiment is HRB400E steel bar with a diameter of 20 mm produced by Laiwu Iron and Steel. Tensile tests are carried out according to the performance indexes of "Grade Ⅰ" joints in the "Technical Specification for Mechanical Connection of Steel Bars" JGJ107. The experimental results are shown in Table 2 below:

[0047]

[0048] Through the tensile test, the results of Experiment 1 meet the performance indexes of the "Grade Ⅰ" joints in the "Technical Specification for Mechanical Connection of Steel Bars" JGJ107, and have better performance than the tensile test results of Experiment 2, Experiment 3 and the blank experiment.

[0049] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A conical sleeve lock nut type steel bar connecting sleeve, the steel bar connecting sleeve comprising a screw sleeve, a conical plug, an adjusting screw sleeve, a locking member, and a connecting screw sleeve, characterized in that, The sleeve, one end of the sleeve is provided with an inner tapered hole, the other end of the sleeve is provided with a first internal threaded hole, the inner tapered hole is connected with the tapered plug, and the first internal threaded hole is threadedly connected with an adjusting sleeve; The tapered plug, a second internal threaded hole is provided in the center of the tapered plug, the second internal threaded hole is threadedly connected with a steel bar, and a first tapered surface at one end of the tapered plug is matched with the inner tapered hole of the sleeve; The adjusting sleeve, the adjusting sleeve includes a first main body part, an abutting part and a third internal threaded hole, the outer surface of the first main body part is provided with a thread, and the main body part is threadedly connected with the first internal threaded hole; the end surface of the abutting part abuts against one end of the steel bar in the tapered plug, and the connecting sleeve is threadedly connected in the third internal threaded hole; The connecting sleeve, the connecting sleeve includes a second main body part and a fourth internal threaded hole, the outer surface of the second main body part is provided with a thread, the second main body part is threadedly connected with the third internal threaded hole, and the fourth internal threaded hole is threadedly connected with a steel bar; The locking member, the locking member is threadedly connected to the thread on the second main body part of the connecting sleeve. In the locked state, one end of the locking member abuts against the end of the sleeve; The sleeve is a cylindrical sleeve, an inner tapered hole is provided inside the end of the sleeve away from the locking member, and the first tapered surface at one end of the tapered plug is matched with the tapered surface of the inner tapered hole of the sleeve; The locking member is a locking nut, the tapered plug is conical, the bottom end of the cone is octagonal, and the second internal threaded hole is a threaded through hole.

2. The tapered sleeve lock nut type steel bar connecting sleeve according to claim 1, characterized in that, The abutting part is arranged as a tapered surface, and the end surface of the abutting part away from the locking member is octagonal.

3. A conical sleeve lock nut type steel bar connecting sleeve according to claim 1, characterized in that, The outer surface of the second main body part of the connecting sleeve is provided with a thread throughout, the thread on the outer surface of the second main body part is threadedly connected with the locking nut, and one end of the second main body part close to the locking nut is octagonal.

4. The tapered sleeve lock nut type steel bar connecting sleeve according to claim 3, characterized in that, A fifth internal threaded hole is provided in the center of the locking nut, the fifth internal threaded hole is threadedly connected with the thread on the outer surface of the second main body part, and the end surface of the locking nut is octagonal.

5. A conical sleeve lock nut type steel bar connecting sleeve according to claim 4, characterized in that, The helix direction of the thread on the surface of the first main body part is opposite to the helix direction of the thread on the surface of the second main body part.

6. The tapered sleeve lock nut type steel bar connecting sleeve according to claim 2, wherein, The taper of the tapered surface on the tapered plug is smaller than the taper of the abutting part on the adjusting sleeve.

7. A connection method for a taper sleeve lock nut type steel bar connection sleeve, characterized in that, The steel bar connecting sleeve is the tapered sleeve lock nut type steel bar connecting sleeve according to any one of the above claims 1-6, and the connecting method includes the following steps: Step 1: Sleeve the sleeve; first sleeve the sleeve on the steel bar with a threaded section; Step 2: Insert the steel bar into the tapered plug; connect the threaded end of the steel bar to the tapered plug and tighten it; Step 3: Sleeve the locking member and insert the steel bar into the connecting sleeve; sleeve the locking member on the other steel bar to be connected, connect the connecting sleeve to the other steel bar with a threaded section, and tighten it; Step 4: Install the adjusting sleeve; screw the adjusting sleeve into the connecting sleeve; Step 5: Move the steel bar to a fixed position; move the two steel bars with the joint assembly installed to a relatively fixed position; Step 6: Adjust the adjusting sleeve; rotate the adjusting sleeve so that it axially moves along the external thread of the connecting sleeve, and make the abutting part in front of the adjusting sleeve tightly abut against the end face of the other steel bar; Step 7: Install the sleeve; move the sleeve in the reverse direction so that it is screwed onto the external thread of the adjusting sleeve, and tighten the sleeve; Step 8: Lock the connecting sleeve; screw the locking piece onto the external thread of the connecting sleeve so that the end face of the locking piece contacts the end face of the sleeve. After rotating it in place, tighten the locking piece to complete the installation.

Images