Steel bar sleeve connecting method and connecting sleeve for building construction formwork tie bars
By processing threads on the inner wall of the sleeve during construction and using cold extrusion technology, combined with the design of limiting parts and reducer structures, the connection strength and construction efficiency of steel bars and steel bars in the prior art are solved. The problem is that the connection reliability and construction efficiency are improved, and the steel bars of different specifications are adapted to.
Patent Information
- Application Number
- CN202411232759.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2024-12-10
AI Technical Summary
In existing construction, the connection methods of steel bars and steel bars and steel bars of formwork tensioning during construction have problems such as low connection strength, low construction efficiency, high professional skills requirements and difficult to control construction quality.
By processing threads on the inner wall of the sleeve and using cold extrusion equipment to squeeze dents along the axial direction perpendicular to the steel bar, increasing friction; limiting parts are arranged in the middle of the sleeve for positioning, and a reduced diameter structure is adopted The sleeve is connected to steel bars and screws, and is cold-extruded with threads of different shapes.
It improves the reliability and construction efficiency of steel bar sleeve connections, reduces the dependence on the skills of the operator, has a wide range of applications, adapts to steel bars of different diameters and specifications, and is conveniently judged to be inserted into place.
Smart Images
Figure CN119102331A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building structure construction, and in particular to a steel sleeve connection method and a connecting sleeve used for reinforcement of a building construction template. Background Art
[0002] At present, the connection methods commonly used for connecting steel bars and steel bars, and steel bars and screws used for template reinforcement in the civil construction process of nuclear power field include: binding overlap, welding, cold extrusion sleeve, etc. Among them, the binding overlap method has the problems of low connection strength and large steel consumption; the welding method has the problems of low construction efficiency and high professional level requirements for welders; the cold extrusion sleeve method has high requirements for crimping force, construction quality is not easy to control, and construction efficiency is low. Summary of the invention
[0003] In view of this, the present invention provides a steel sleeve connection method and a connecting sleeve for building construction formwork reinforcement, which can improve the reliability of the steel sleeve connection and enhance the construction efficiency.
[0004] The technical solution adopted by the present invention is as follows:
[0005] A steel sleeve connection method for reinforcement of building construction templates, wherein the inner wall of the sleeve is processed with threads, the steel bar extends into the sleeve, and cold extrusion equipment starts from the middle of the sleeve to the end of the sleeve, and extrudes one by one along the direction perpendicular to the axial direction of the steel bar and aligned with the cross ribs of the steel bar to form a dent to fasten the connection with the steel bar, and the threads on the inner wall of the sleeve contact the surface of the steel bar to increase friction.
[0006] Furthermore, when a steel bar is connected to another steel bar through a sleeve, a limit piece is set in the middle of the sleeve, and two steel bars are respectively inserted from both ends of the sleeve, and axially positioned by the limit piece in the middle of the sleeve, and the axes of the two steel bars coincide with the axis of the sleeve; the cold extrusion equipment extrude from the middle of the sleeve to both ends of the sleeve.
[0007] Furthermore, when the steel bar is connected to the screw rod through the sleeve, two sections of threads of different shapes are processed on the inner wall surface of the sleeve, which respectively cooperate with the steel bar and the screw rod; the screw rod is inserted into one end of the sleeve and connected with its thread, and the steel bar is inserted from the other end of the sleeve until it fits with the end face of the screw rod, and the axis of the steel bar, the axis of the screw rod and the axis of the sleeve coincide with each other; after the steel bar is inserted into place, the steel bar and the sleeve are connected by cold extrusion.
[0008] Furthermore, the length of the threaded section corresponding to the screw rod is shorter than the length of the threaded section corresponding to the steel bar.
[0009] Furthermore, the thread segment corresponding to the screw rod is a trapezoidal thread segment.
[0010] The present invention also provides a connecting sleeve for reinforcement of building construction templates, wherein the sleeve is used to connect steel bars to each other; the inner wall surface of the sleeve is integrally processed with threads to increase the friction force after cold extrusion connection with the surface of the steel bar; a limit piece is arranged in the middle of the sleeve to axially position the steel bar inserted into the sleeve; the tensile strength of the sleeve is greater than the tensile strength of the steel bar.
[0011] Furthermore, the limiting member is a positioning screw.
[0012] The present invention also provides a connecting sleeve for reinforcement of building construction templates, the sleeve is used to connect steel bars and screw rods; the inner wall surface of the sleeve is processed with two sections of threads of different shapes, one section of the threads is used to connect to the steel bars by cold extrusion method; the other section of the threads is used to connect to the screw rod threads; the tensile strength of the sleeve is greater than the tensile strength of the steel bars.
[0013] Furthermore, the sleeve is a stepped shaft, divided into a large diameter section and a small diameter section, the small diameter section is used to connect with the screw, and the large diameter section is used to connect with the steel bar; the length of the small diameter section is shorter than that of the large diameter section; the inner hole diameter of the small diameter section is smaller than the inner hole diameter of the large diameter section.
[0014] Furthermore, the thread connected to the screw thread is a trapezoidal thread.
[0015] Beneficial effects:
[0016] 1. The present invention processes threads on the inner wall of the sleeve and utilizes cold extrusion to cause plastic deformation of the sleeve in the radial direction to form indentations for fastening connection with the steel bar. The contact between the threads on the inner wall of the sleeve and the surface of the steel bar increases friction and improves the reliability of the connection between the steel bar and the sleeve. The operation method is simple, which reduces the dependence on the skill level of the operators and greatly improves the construction efficiency of the template reinforcement at the construction site.
[0017] 2. When the present invention connects steel bars, a positioning piece is provided in the middle of the sleeve to axially position the steel bars inserted into the sleeve, so that it is possible to conveniently and quickly determine whether the steel bars are inserted in place.
[0018] 3. The sleeve used for connecting steel bars and screw rods of the present invention is of different diameters, and the inner hole diameter of the small diameter section is smaller than that of the large diameter section, so that the screw rod can match steel bars of different diameters and specifications, and is widely applicable; secondly, an end face is formed at the joint between the inner hole of the small diameter section and the inner hole of the large diameter section, which can conveniently limit the insertion depth of the steel bar. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the steel bar connection structure of the present invention.
[0020] Figure 2 It is a schematic diagram of the sleeve structure used to connect steel bars.
[0021] Figure 3 for Figure 2 Section view.
[0022] Figure 4 It is a schematic diagram of the connection structure between the steel bar and the screw rod of the present invention.
[0023] Figure 5 It is a schematic diagram of the sleeve structure used to connect steel bars and screw rods.
[0024] Figure 6 for Figure 5 Section view.
[0025] Among them, 1-rebar I, 2-rebar and rebar connecting sleeve, 3-screw, 4-rebar and screw connecting sleeve, 5-rebar II, 6-positioning screw, 7-anti-slip thread, 8-trapezoidal thread. DETAILED DESCRIPTION
[0026] The present invention is described in detail below with reference to the accompanying drawings and embodiments.
[0027] The present invention provides a steel sleeve connection method for reinforcement of building construction templates, wherein an anti-slipping thread 7 is processed on the inner wall of the sleeve, and a steel bar I1 is extended into the sleeve. A cold extrusion device starts from the middle of the sleeve to the end of the sleeve, and extrudes one by one along a direction perpendicular to the axial direction of the steel bar I1 and aligned with the transverse ribs on the steel bar I1 to form a dent to be tightly connected with the steel bar I1, and the anti-slipping thread 7 on the inner wall of the sleeve contacts with the surface of the steel bar I1 to increase friction.
[0028] Furthermore, if Figure 1 , Figure 2 , Figure 3As shown, when steel bar I is connected to another steel bar through a sleeve, the sleeve is a sleeve 2 for connecting steel bars. A stopper is provided in the middle of the sleeve, and two steel bars are inserted from both ends of the sleeve respectively. The stopper is axially positioned in the middle of the sleeve, and the axes of the two steel bars coincide with the axis of the sleeve; the cold extrusion equipment extrude from the middle of the sleeve to both ends of the sleeve. The stopper can be a positioning screw 6. The sleeve is a steel sleeve. The steel bar end of the present invention does not need to be threaded, and the two steel bars are inserted from both ends of the sleeve respectively until the steel bar end contacts the positioning screw 6, indicating that the steel bar has been inserted into place. Check the depth of the steel bar inserted into the sleeve, then squeeze one end of the sleeve, and then squeeze the other end of the sleeve, and finally check and accept. The axis of the connected steel bar and the axis of the sleeve should maintain the same axis to prevent eccentricity and bending. During the extrusion process, the crimping direction of the cold extrusion equipment is perpendicular to the transverse ribs of the compressed steel bar, and the crimping is done from the center of the sleeve to the end. If the sleeve is squeezed from both sides to the middle, it may cause the sleeve to crack or be squeezed empty (pressed to a place without steel bars) and cut off. In terms of the extrusion direction, the axis of the extrusion pliers should be perpendicular to the axis of the steel bar, and it should be squeezed towards the transverse ribs of the steel bar as much as possible so that the sleeve can obtain the best performance. After the sleeve is squeezed, the sleeve should be fully covered with the steel bar, so that the anti-slip thread 7 fits tightly with the steel bar, and the friction between the steel bar and the sleeve is increased.
[0029] The working principle is: the sleeve is radially extruded by cold extrusion equipment to cause plastic deformation of the sleeve in the radial direction, so that the inner wall of the sleeve is embedded in the groove between the transverse ribs of the steel bar to achieve the connection of the two steel bars. The axial force borne by the steel bar is mainly transmitted through the shear force between the transverse ribs of the steel bar and the deformed sleeve, and the anti-slip thread 7 further increases the friction between the steel bar and the sleeve.
[0030] Furthermore, if Figure 4 , Figure 5 , Figure 6 As shown, when the steel bar II 5 is connected to the screw rod 3 through the sleeve, the sleeve is the steel bar and screw rod connecting sleeve 4, and two sections of threads of different shapes are processed on the inner wall of the sleeve, which are matched with the steel bar II 5 and the screw rod 3 respectively; the steel bar II 5 and the sleeve are connected by cold extrusion, and the screw rod 3 and the sleeve are threaded, and the axis of the steel bar II 5 and the axis of the screw rod 3 coincide with the axis of the sleeve. The length of the threaded section corresponding to the screw rod 3 is shorter than the length of the threaded section corresponding to the steel bar II 5. The thread shape of the threaded section corresponding to the screw rod 3 is a trapezoidal thread 8, that is, the length of the trapezoidal thread 8 is shorter than the length of the anti-slip thread 7.
[0031] Specifically, the screw 3 is inserted into the sleeve by screwing until the screw 3 is fully meshed with the trapezoidal thread 8 in the sleeve. The steel bar Ⅱ5 is inserted into the sleeve until the end face of the steel bar Ⅱ5 fits with the end face of the screw 3 that has been screwed into the sleeve. After the steel bar Ⅱ5 is inserted into place, the sleeve of the steel bar segment is extruded by cold extrusion equipment. The extrusion sequence is from the middle of the sleeve to the end, and the extrusion direction is perpendicular to the axis of the extrusion clamp and the axis of the steel bar Ⅱ5. It should be extruded as much as possible towards the transverse rib of the steel bar Ⅱ5 so that the sleeve can obtain the best performance. The sleeve should be extruded into place so that the sleeve is fully covered with the steel bar Ⅱ5, the anti-slip thread 7 is closely fitted with the steel bar Ⅱ5, and the friction between the steel bar Ⅱ5 and the sleeve is increased.
[0032] Its working principle is: the end of the steel bar is connected to the steel bar II5 by plastic deformation in the radial direction through the sleeve, and the screw end is connected by screwing the screw 3 with the trapezoidal thread 8 in the sleeve. The axial force borne by the steel bar II5 is mainly transmitted through the shear force between the transverse ribs of the steel bar II5 and the deformed sleeve, and the anti-slip thread 7 further increases the friction between the steel bar II5 and the sleeve; the axial force borne by the screw 3 is mainly transmitted through the extrusion between the trapezoidal threads 8.
[0033] The present invention also provides a connecting sleeve for reinforcement of building templates, which is used for connecting steel bars to steel bars, i.e., a sleeve 2 for connecting steel bars to steel bars; the inner wall surface of the sleeve is integrally processed with an anti-slip thread 7 to increase the friction force after cold extrusion connection with the steel bar surface; a stopper is arranged in the middle of the sleeve to axially position the steel bar inserted into the sleeve; the tensile strength of the sleeve is greater than the tensile strength of the steel bar. In this embodiment, the stopper is a positioning screw 6, which extends into the sleeve and is fixed on the sleeve.
[0034] The present invention also provides a connecting sleeve for reinforcement of building construction templates, which is used to connect steel bars and screw rods 3, that is, steel bars and screw rod connecting sleeves 4; the inner wall surface of the sleeve is processed with two sections of threads of different shapes, one section of the thread is used to connect with the steel bars by cold extrusion method; the other section of the thread is used to be threadedly connected with the screw rod 3; the tensile strength of the sleeve is greater than the tensile strength of the steel bars.
[0035] Specifically, the thread connected with the screw rod 3 is a trapezoidal thread 8. The sleeve is a stepped shaft, which is divided into a large diameter section and a small diameter section. The small diameter section is used to connect with the screw rod 3, and the large diameter section is used to connect with the steel bar. The length of the small diameter section is shorter than that of the large diameter section. The diameter of the inner hole of the small diameter section is smaller than that of the inner hole of the large diameter section. Therefore, an end face is formed at the joint between the inner hole of the diameter section and the inner hole of the large diameter section. Then, when making a connection, the steel bar II can be inserted first and positioned axially by the end face, or the screw rod 3 can be inserted first and the steel bar II can be positioned axially by the end face of the screw rod 3. The operation method is flexible and changeable.
[0036] Preferably, the length of the large diameter section is 2 / 3 of the total length of the sleeve, and the length of the small diameter section is 1 / 3 of the total length of the sleeve.
[0037] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A steel sleeve connection method for building construction template reinforcement, characterized in that: The inner wall of the sleeve is processed with threads, and the steel bar extends into the sleeve. The cold extrusion equipment starts from the middle of the sleeve to the end of the sleeve, and extrudes one by one along the direction perpendicular to the axial direction of the steel bar and aligned with the cross ribs of the steel bar to form indentations and fasten the connection with the steel bar. The threads on the inner wall of the sleeve contact the surface of the steel bar to increase friction.
2. The method for connecting steel sleeves for building construction template reinforcement according to claim 1, characterized in that: When a steel bar is connected to another steel bar through a sleeve, a limiter is set in the middle of the sleeve. Two steel bars are inserted from both ends of the sleeve respectively and axially positioned by the limiter in the middle of the sleeve. The axes of the two steel bars coincide with the axis of the sleeve. The cold extrusion equipment extrude from the middle of the sleeve to both ends of the sleeve.
3. The method for connecting steel sleeves for building construction template reinforcement according to claim 1, characterized in that: When the steel bar is connected to the screw rod through a sleeve, two sections of threads of different shapes are processed on the inner wall of the sleeve, which respectively cooperate with the steel bar and the screw rod; the screw rod is inserted into one end of the sleeve and connected with its thread, and the steel bar is inserted from the other end of the sleeve until it fits with the end face of the screw rod, and the axis of the steel bar, the axis of the screw rod and the axis of the sleeve coincide with each other; after the steel bar is inserted into place, the steel bar and the sleeve are connected by cold extrusion.
4. The method for connecting steel sleeves for building construction template reinforcement according to claim 3, characterized in that: The length of the threaded section corresponding to the screw rod is shorter than the length of the threaded section corresponding to the steel bar.
5. The method for connecting steel sleeves for building construction template reinforcement according to claim 3 or 4, characterized in that: The thread segment corresponding to the screw rod is a trapezoidal thread segment.
6. A connecting sleeve for reinforcement of building formwork, characterized in that: The sleeve is used to connect steel bars; the inner wall of the sleeve is integrally threaded to increase the friction after cold extrusion connection with the steel bar surface; a limiter is provided in the middle of the sleeve to axially position the steel bar inserted into the sleeve; the tensile strength of the sleeve is greater than the tensile strength of the steel bar.
7. The connecting sleeve for the reinforcement of the building formwork according to claim 6, characterized in that: The limiting member is a positioning screw.
8. A connecting sleeve for reinforcement of building formwork, characterized in that: The sleeve is used to connect the steel bar and the screw rod; the inner wall of the sleeve is processed with two sections of threads of different shapes, one section of the threads is used to connect with the steel bar by cold extrusion method; the other section of the threads is used to connect with the screw rod thread; the tensile strength of the sleeve is greater than the tensile strength of the steel bar.
9. The connecting sleeve for the reinforcement of the building formwork according to claim 8, characterized in that: The sleeve is a stepped shaft, divided into a large diameter section and a small diameter section. The small diameter section is used to connect with the screw rod, and the large diameter section is used to connect with the steel bar. The length of the small diameter section is shorter than that of the large diameter section. The inner hole diameter of the small diameter section is smaller than that of the large diameter section.
10. The connecting sleeve for building construction template reinforcement according to claim 8 or 9, characterized in that: The thread connected with the screw thread is a trapezoidal thread.