CN216340480U - Axial reinforcing steel bar cold extrusion connecting structure - Google Patents
Axial reinforcing steel bar cold extrusion connecting structure Download PDFInfo
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- CN216340480U CN216340480U CN202122703721.7U CN202122703721U CN216340480U CN 216340480 U CN216340480 U CN 216340480U CN 202122703721 U CN202122703721 U CN 202122703721U CN 216340480 U CN216340480 U CN 216340480U
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Abstract
The utility model discloses an axial reinforcing steel bar cold extrusion connecting structure. The connecting sleeve comprises an inner sleeve and an outer sleeve; the inner sleeve is of a cylindrical tubular structure and comprises an inner sleeve boss, an inner sleeve deformation area, an inner sleeve flange and an inner sleeve cone with a conical surface structure; the outer sleeve is sleeved on the outer wall of the inner sleeve and is in clearance fit with the inner sleeve, and the outer sleeve comprises an outer sleeve cone with a conical surface structure; the end of the steel bar fixed by the connecting steel bar extending into the inner sleeve is hardened and heat treated. The connecting sleeve utilizes the principle of metal plastic deformation, and uses a special riveting tool to push the outer sleeve and the inner sleeve to generate relative movement, so that the reinforcing steel bars and the sleeve form a whole, clamping force is generated between the reinforcing steel bars or rod pieces at two ends, the ends of the reinforcing steel bars subjected to hardening heat treatment suggest higher tensile force with higher hardness, and the arrangement of the wall groove of the inner sleeve further increases the connecting strength.
Description
Technical Field
The utility model relates to the technical field of connection of structural rods, and relates to a rod connecting structure, a connecting tool and a connecting method thereof, in particular to an axial steel bar cold extrusion connecting structure.
Background
At present, the common reinforcing steel bar mechanical connection modes at home and abroad mainly comprise sleeve radial cold extrusion and taper sleeve axial extrusion, taper threads, straight threads, upset straight threads, grouting sleeves and other connection modes. The existing radial cold extrusion connection mainly has the defects of heavy extrusion tools, low extrusion speed, unstable joint performance and the like, the axial extrusion speed of the taper sleeve is higher than that of the straight sleeve, the extrusion tools are lighter, but the defects of more structural parts, high cost, complex locking plate processing technology and the like exist. The field operability of threaded connection is poor, the performance of the joint is greatly influenced by manual operation, and the performance of the joint is unstable; the strength and tensile resistance of the conventional knot part and the body of the twisted steel are the same, and adverse factors such as strength generated by extrusion deformation in extrusion connection can influence performance parameters after connection, so that the connection requirement of higher strength cannot be met.
Disclosure of Invention
The utility model discloses an axial reinforcing steel bar cold extrusion connecting structure according to the defects of the prior art. The utility model aims to provide a rod piece connecting structure which is high in adaptability, stability and construction efficiency, and is high in strength and convenient to operate.
The utility model is realized by the following technical scheme:
the utility model provides an axial reinforcing bar cold extrusion connection structure, connection structure includes through extrusion hookup coupling sleeve as an organic whole and hookup reinforcing bar, its characterized in that:
the coupling sleeve comprises an inner sleeve: the inner sleeve is of a cylindrical tubular structure, an inner sleeve boss with the caliber smaller than the inner diameter of the inner sleeve and used for fixing and limiting connecting reinforcing steel bars at two ends is arranged in the middle of the inner sleeve, two ends of the inner sleeve boss are inner sleeve deformation areas for embedding and connecting the connecting reinforcing steel bars, an inner sleeve flange of a flange structure is arranged on the peripheral surface of the cylindrical tubular structure, and an inner sleeve cone of a conical surface structure matched with the outer sleeve is arranged at the end part of the cylindrical tubular structure;
the coupling sleeve comprises an outer sleeve: the outer sleeve is sleeved on the outer wall of the inner sleeve and is in clearance fit with the inner sleeve, and the inner wall of one end of the outer sleeve is provided with an outer sleeve cone with a conical surface structure matched with the inner sleeve;
connecting steel bars: the end of the steel bar fixed by the connecting steel bar extending into the inner sleeve is hardened and heat treated, and the length of the end of the steel bar after hardening and heat treatment is more than one fourth of the length of the sleeve.
Furthermore, a plurality of groups of inner sleeve wall grooves are axially arranged on the inner sleeve wall to form a multi-petal structure with the inner sleeve radial section being centrosymmetric.
One structure is that one end of the cylindrical tubular structure of the inner sleeve is provided with an inner sleeve flange, and the inner sleeve wall is provided with a plurality of inner sleeve wall grooves which have one end penetrating through the inner sleeve end surface and the other end ending at the front end surface of the inner sleeve flange and separate the inner sleeve wall into the same multi-petal structure. The outer sleeve is a cylindrical tubular structure with the axial length same as that of the inner sleeve.
The other structure is that the middle part of the cylindrical tubular structure is provided with an inner sleeve flange, the inner sleeve wall is provided with a plurality of groups of inner sleeve wall grooves, one end of each inner sleeve wall penetrates through the inner sleeve end face, the other end of each inner sleeve wall is stopped at the front end face of the inner sleeve flange, and the two inner sleeve wall grooves are symmetrically arranged along the axial direction and divide the inner sleeve wall into the same multi-petal structure. The outer sleeves are two cylindrical tubular structures, and the axial length of each outer sleeve is one half of that of the inner sleeve.
The outer wall of the end face of one end or two ends of the inner sleeve is provided with an inner sleeve cone with a conical surface structure matched with the outer sleeve; the included angle alpha between the conical surface of the inner sleeve and the axial direction meets the following requirements: alpha is more than or equal to 0 and less than or equal to 900(ii) a The axial length of the conical surface of the inner sleeve is less than or equal to one half to one quarter of the length of the inner sleeve.
The inner wall of the inner sleeve is a smooth surface structure which is provided with threads or concave-convex ring grooves in a processing mode.
The connecting structure realizes connection through a special tool for connecting the sleeve by cold extrusion of the axial steel bar, wherein the special tool comprises a guide mechanism, a sliding pressure head, a fixed pressure head and a hydraulic power driving oil cylinder; the guide mechanism is a slide bar device, one end of the guide mechanism is provided with a fixed pressing head, the other end of the guide mechanism is provided with a sliding pressing head driven by a driving oil cylinder, the sliding pressing head is provided with a driving arm for driving an extrusion sleeve, and the fixed pressing head is provided with a fixed arm for fixing the flange end of an outer sleeve.
The utility model has the following beneficial effects: the connecting sleeve utilizes the principle of metal plastic deformation, a professional riveting tool is used for pushing the outer sleeve and the inner sleeve to move relatively, the outer sleeve extrudes the inner sleeve along the axial direction, metal of the inner sleeve flows into gaps between the transverse ribs of the steel bars along the radial direction, so that the steel bars and the sleeve form a whole, clamping force is generated between the steel bars or rod pieces at two ends, and the end of the steel bar subjected to hardening heat treatment suggests higher tensile force with higher hardness; the arrangement of the inner sleeve wall groove further increases the connection strength, the connection processing is more stable and convenient, the arrangement of the inner sleeve boss enables the connection to be more accurate, and human errors during connection operation are avoided.
Drawings
FIG. 1 is a schematic view of a coupling structure for a coupling sleeve according to the present invention;
FIG. 2 is a schematic view of another coupling structure of the connecting sleeve of the present invention;
FIG. 3 is a schematic end view of a configuration of an inner sleeve of the present invention;
FIG. 4 is a schematic front view of an inner sleeve of the present invention;
FIG. 5 is a schematic view of the construction of an outer sleeve according to the present invention;
FIG. 6 is an end view of an alternative construction of the inner sleeve of the present invention;
FIG. 7 is a longitudinal cross-sectional view of an alternative configuration of the inner sleeve of the present invention;
FIG. 8 is a schematic view of a coupling process for the coupling sleeve of the present invention;
FIG. 9 is a schematic view of another coupling process for the connecting sleeve of the present invention;
fig. 10 is a schematic view showing a processed length of a reinforcing bar end inserted into the coupling sleeve of the present invention;
FIG. 11 is a graph showing comparative results of joint tensile force measurements;
fig. 12 is a special press-fit connection tool of the present invention.
In the figure, 1 is an outer sleeve, 2 is an inner sleeve, 3 is a connecting steel bar, 4 is a sliding pressure head, 5 is a fixed pressure head, 6 is a guide mechanism, 7 is a driving oil cylinder, 21 is an inner sleeve deformation area, 22 is an inner sleeve boss, 23 is an inner sleeve wall groove, 24 is an inner sleeve cone, and 25 is an inner sleeve flange;
d is the inner sleeve flange diameter, D1 is the inner sleeve outside diameter, D2 is the inner sleeve inside diameter, D3 is the inner sleeve boss inside diameter, D4 is the outer sleeve inside diameter, L is the inner sleeve length, L1 is the inner sleeve taper surface axial length, L2 is the inserted sleeve reinforcement end length, alpha is the inner sleeve taper surface and axial included angle, A is the joint tension curve after hardening heat treatment, B is the joint tension curve without hardening heat treatment.
Detailed Description
The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the utility model and is not intended to limit the utility model in any way, but is equivalent or analogous to the present invention without departing from its scope.
The first embodiment is as follows:
the axial reinforcing steel bar cold extrusion connecting sleeve comprises an outer sleeve 1 and an inner sleeve 2.
As shown in fig. 1, 3, 4 and 8, the connecting sleeve of the present example is composed of an inner sleeve 2 and an outer sleeve 1.
The inner sleeve 2 is a cylindrical tubular structure, has a symmetrical inner circular tube structure with two ends used for being sleeved in the connecting reinforcing steel bars 3, and comprises an inner sleeve deformation area 21 used for being embedded and connected with the connecting reinforcing steel bars 3, and an inner sleeve boss 22 which is positioned in the middle of the sleeve and is fixedly limited and connected with the reinforcing steel bars 3 at two ends, in the embodiment, a plurality of groups of inner sleeve wall grooves 23 are axially arranged on the wall of the inner sleeve 2, one end of the cylindrical tubular structure of the inner sleeve 2 is provided with an inner sleeve cone 24 with a conical surface structure matched with the outer sleeve 1, and the other end of the cylindrical tubular structure of the inner sleeve 2 is provided with an inner sleeve flange 25 with a flange structure.
The inner sleeve 2 may have a plurality of inner sleeve wall grooves 23 in the axial direction on the cylinder wall, or may not have the inner sleeve wall grooves 23. Set up inner skleeve wall groove 23 and can effectively increased the radial shrink of inner skleeve 2, make inner skleeve 2 take place plastic deformation more easily, reduce and press the required power of riveting process, the inner skleeve 2 metal is more filled between the reinforcing bar class rib, inner skleeve wall groove 23 is no less than two sets of and separates into same orange-peel texture along circumference symmetrical arrangement with inner skleeve 2 section of thick bamboo wall.
One end of the cylindrical structure of the inner sleeve 2 is provided with an inner sleeve cone 24 of a conical surface structure matched with the outer sleeve 1. The inner sleeve cone 24 plays a centering and positioning function in the early stage of press riveting, the contact area between the outer sleeve 1 and the inner sleeve 2 is effectively increased, the inner sleeve 2 and the outer sleeve 1 move relatively on the same axis in the early stage of press riveting, the inner sleeve 2 is enabled to generate uniform and stable plastic deformation, and the conical surface of the inner sleeve cone 24 can also be replaced by circular arc transition.
The middle part of the cylinder body of the cylindrical tubular structure of the inner sleeve 2 is an inner sleeve deformation zone 21, the inner sleeve deformation zone 21 is extruded by the outer sleeve 1 under the action of a special extruding tool to generate maximum plastic deformation, so that the metal of the inner sleeve 2 flows into a gap between the transverse ribs of the connecting reinforcing steel bars 3, and the clamping force required by the connection of the connecting reinforcing steel bars 3 at two ends is provided.
The inner sleeve 2 is positioned in the middle of the sleeve and is provided with an inner sleeve boss 22 for fixing and limiting the connecting reinforcing steel bars 3 at two ends, the inner sleeve boss 22 plays a role in positioning the connecting reinforcing steel bars 3 at two ends, the extruded lengths of the connecting reinforcing steel bars 3 inserted into the inner sleeve 2 are controlled to be equal, and the balance of the fixed connecting force is ensured.
In this embodiment, an inner sleeve flange 25 with a flange structure is arranged at one end of the cylindrical structure of the inner sleeve 2, and the inner sleeve flange 25 plays a role in pressure riveting limitation, so that when the outer sleeve 1 contacts with the end surface of the flange, the installation is finished.
The inner wall of the inner sleeve 2 can be in a concave-convex structure form such as smooth, processed thread or annular groove.
As shown in figure 5, the outer sleeve 1 has smooth cylindrical inner and outer walls and has an internal taper at one end which matches the internal sleeve taper 24.
D is the inner sleeve flange diameter, D1 is the inner sleeve outer diameter, D2 is the inner sleeve inner diameter, D3 is the inner sleeve boss inner diameter, D4 is the outer sleeve inner diameter, L is the inner sleeve length, L1 is the inner sleeve taper surface axial length, and α is the inner sleeve taper surface and axial included angle.
The inner sleeve outer diameter D1 is less than the inner sleeve flange diameter D. The included angle alpha between the conical surface of the inner sleeve and the axial direction meets the following requirements: alpha is more than or equal to 0 and less than or equal to 900. The inner sleeve tapered surface axial length L1 is less than or equal to one-half of the inner sleeve length L. The inner sleeve boss inner diameter D3 is less than the inner sleeve inner diameter D2. The inner sleeve outer diameter D1 is greater than the outer sleeve inner diameter D4.
As shown in fig. 12, the main structure of the special tool of the present invention includes: the device comprises a guide mechanism 6, a sliding pressure head 4, a fixed pressure head 5 and a hydraulic power driving oil cylinder 7.
During connection processing, the inner sleeve 2 is inserted into the lower end steel bar, the end of the inner sleeve flange 25 is supported on the tool fixing pressure head 5, the outer sleeve 1 is inserted into the upper end steel bar, the upper end steel bar is inserted into the inner sleeve 2, then the conical openings of the inner sleeve and the outer sleeve are in matched contact, the tool sliding pressure head 4 is in contact with the other end of the outer sleeve 1, the pump station is started, the outer sleeve 1 extrudes the inner sleeve 2 along the axial direction, and when one end of the conical opening of the outer sleeve 1 is in contact with the end surface of the inner sleeve flange 25, joint connection is completed.
Example two:
the axial reinforcing steel bar cold extrusion connecting sleeve comprises an outer sleeve 1 and an inner sleeve 2.
As shown in fig. 2, 6, 7 and 9, the connecting sleeve of the present example is composed of an inner sleeve 2 and two outer sleeves 1.
The inner sleeve 2 is a cylindrical tubular structure, and has a symmetrical inner circular tube structure with two ends used for being sleeved in the connecting reinforcing steel bars 3, an inner sleeve deformation area 21 used for being embedded and connected with the connecting reinforcing steel bars 3, and an inner sleeve boss 22 which is positioned in the middle of the sleeve and is fixedly limited and is connected with the reinforcing steel bars 3 at two ends, in the embodiment, an inner sleeve flange 25 with a flange structure is arranged on the circumferential surface of the cylindrical tubular structure in the middle of the cylindrical tubular structure of the inner sleeve 2 and at the same position as the inner sleeve boss 22, in the embodiment, a plurality of groups of inner sleeve wall grooves 23 are axially arranged on the wall of the inner sleeve 2, each group of inner sleeve wall grooves 23 are axially arranged and are symmetrically arranged into two separated sections along the inner sleeve flange 25, and inner sleeve cones 24 with conical surface structures matched with the outer sleeve 1 are arranged at the two end parts of the cylindrical tubular structure of the inner sleeve 2.
The inner sleeve 2 may have a plurality of inner sleeve wall grooves 23 in the axial direction on the cylinder wall, or may not have the inner sleeve wall grooves 23. Set up inner skleeve wall groove 23 and can effectively increased the radial shrink of inner skleeve 2, make inner skleeve 2 take place plastic deformation more easily, reduce and press the required power of riveting process, the inner skleeve 2 metal is more filled between the reinforcing bar class rib, inner skleeve wall groove 23 is no less than two sets of and separates into same orange-peel texture along circumference symmetrical arrangement with inner skleeve 2 section of thick bamboo wall.
The two ends of the cylindrical structure of the inner sleeve 2 are provided with inner sleeve cones 24 of a conical surface structure matched with the outer sleeve 1. The inner sleeve cone 24 plays a centering and positioning function in the early stage of press riveting, the contact area between the outer sleeve 1 and the inner sleeve 2 is effectively increased, the inner sleeve 2 and the outer sleeve 1 move relatively on the same axis in the early stage of press riveting, the inner sleeve 2 is enabled to generate uniform and stable plastic deformation, and the conical surface of the inner sleeve cone 24 can also be replaced by circular arc transition.
The inner sleeve deformation zone 21 is arranged on two sides of the inner sleeve flange 25 of the cylindrical barrel-shaped structure of the inner sleeve 2, the inner sleeve deformation zone 21 is extruded by the outer sleeve 1 under the action of a special extruding tool to generate maximum plastic deformation, so that metal of the inner sleeve 2 flows into a gap between the transverse ribs of the connecting reinforcing steel bars 3, and clamping force required by connecting the connecting reinforcing steel bars 3 at two ends is provided.
The inner sleeve 2 is positioned in the middle of the sleeve and is provided with an inner sleeve boss 22 for fixing and limiting the connecting reinforcing steel bars 3 at two ends, the inner sleeve boss 22 plays a role in positioning the connecting reinforcing steel bars 3 at two ends, the extruded lengths of the connecting reinforcing steel bars 3 inserted into the inner sleeve 2 are controlled to be equal, and the balance of the fixed connecting force is ensured.
In this embodiment, the inner sleeve flange 25 with a flange structure is arranged in the middle of the cylindrical tubular structure of the inner sleeve 2, the inner sleeve flange 25 plays a role in pressure riveting and limiting, and when the outer sleeves 1 on both sides contact the end surfaces of the flanges, the installation is completed.
The inner wall of the inner sleeve 2 can be in a concave-convex structure form such as smooth, processed thread or annular groove.
As shown in figure 5, the outer sleeves 1 are two in the same structure, the axial length of each outer sleeve 1 is the same as the length from the end surface of the inner sleeve flange 25 to the tail end of the inner sleeve 2, the inner wall and the outer wall of each outer sleeve 1 are smooth cylindrical, and one end of each outer sleeve 1 is provided with an inner cone structure matched with the cone 24 structure of the inner sleeve.
The inner wall of the inner sleeve 2 can be in a concave-convex structure form such as smooth, processed thread or annular groove.
D is the inner sleeve flange diameter, D1 is the inner sleeve outer diameter, D2 is the inner sleeve inner diameter, D3 is the inner sleeve boss inner diameter, D4 is the outer sleeve inner diameter, L is the inner sleeve length, L1 is the inner sleeve taper surface axial length, and α is the inner sleeve taper surface and axial included angle.
The inner sleeve outer diameter D1 is less than the inner sleeve flange diameter D. The included angle alpha between the conical surface of the inner sleeve and the axial direction meets the following requirements: alpha is more than or equal to 0 and less than or equal to 900. The inner sleeve tapered surface axial length L1 is less than or equal to one-quarter of the inner sleeve length L. The inner sleeve boss inner diameter D3 is less than the inner sleeve inner diameter D2. The inner sleeve outer diameter D1 is greater than the outer sleeve inner diameter D4.
As shown in fig. 12, the main structure of the special tool of the present invention includes: the device comprises a guide mechanism 6, a sliding pressure head 4, a fixed pressure head 5 and a hydraulic power driving oil cylinder 7.
During connection processing, the outer sleeve 1 is inserted into the reinforcing steel bars at two ends, then the reinforcing steel bars at two ends are inserted into the inner sleeve 2, the conical openings of the inner sleeve and the outer sleeve are in matched contact, the outer sleeves 1 at two ends are respectively in contact with the tool fixing pressure head 5 and the sliding pressure head 4, the pump station is started, the sliding pressure head 4 moves, the outer sleeves 1 at two ends are pushed to extrude the inner sleeve 2 along the axis direction, and the installation is completed when the conical openings at two ends of the outer sleeve 1 are in contact with the end surface of the inner sleeve flange 25.
The inner sleeve wall groove 23 is axially arranged on the inner sleeve 2 wall to divide the inner sleeve wall into the same multi-petal structure.
As shown in fig. 3, the inner sleeve wall groove 23 has a structure penetrating the cylindrical wall, and is arranged continuously in the axial direction of the cylindrical wall. Referring to fig. 4, the inner sleeve wall groove 23 has one end penetrating the end surface of the inner sleeve 2 and the other end terminating at the front end surface of the inner sleeve flange 25 to divide the inner sleeve 2 into the same multi-lobe structure.
As shown in fig. 6, the inner sleeve wall grooves 23 have a structure penetrating the cylindrical wall, and are arranged in two groups axially symmetrically in the cylindrical wall. Referring to fig. 7, one end of the inner sleeve wall groove 23 penetrates through the end surface of the inner sleeve 2, the other end of the inner sleeve wall groove ends at the front end surface of the inner sleeve flange 25, two inner sleeve wall grooves are symmetrically arranged along the axial direction in each group, and the inner sleeve wall 2 is divided into the same multi-lobe structure.
Before the steel bars are connected, the end part of the connected steel bar inserted into the inner sleeve 2 is hardened to enable the hardness of the steel bar of a certain length section of the end part of the steel bar to be higher than that of other areas of the steel bar. This section steel hardness after handling is high, the cross rib intensity on this section reinforcing bar is higher than other regions, this section cross rib height can not change at axial extrusion in-process, the recess volume between the cross rib is unchangeable, the recess is filled completely to the sleeve metal like this, make the frictional force between sleeve and the reinforcing bar bigger, it is more firm to connect, simultaneously because the cross rib intensity of the reinforcing bar section that inserts the sleeve is high, when the load is applyed to the axial, the shearing force increase that the cross rib bore, the plastic deformation can not take place for the cross rib of reinforcing bar when the loading, make the reinforcing bar can not follow and extract in the sleeve, the destruction form that probably takes place only sleeve outside reinforcing bar is disconnected or the sleeve is pulled apart.
The utility model carries out comparison test detection on six pairs of different connecting steel bars after hardening heat treatment. The same batch of reinforcing steel bars with the same specification and the same strength are connected by adopting two sleeves with the same form, wherein the connecting reinforcing steel bars are divided into two types, one type is that two end parts of the reinforcing steel bars to be connected are not subjected to any treatment, and the other type is that the surfaces of the two end parts of the connecting reinforcing steel bars are subjected to portable high-frequency induction quenching so as to harden the surfaces of the end parts of the two reinforcing steel bars to be connected. After connection, the unidirectional tensile test is carried out on two joint structures with the same specification, and the results show that when the ends of the connecting steel bars are not treated, the joint structure destruction forms mainly take steel bar pulling out, the pulling-out force is smaller than the treated steel bar joint destruction force, and the hardened connecting steel bars are broken. As a result, as shown in FIG. 11, the joint A subjected to the hardening heat treatment showed a significantly increased breaking force as compared with the same joint B not subjected to the hardening heat treatment.
Claims (8)
1. The utility model provides an axial reinforcing bar cold extrusion connection structure, connection structure includes through extrusion hookup coupling sleeve as an organic whole and hookup reinforcing bar, its characterized in that:
the coupling sleeve comprises an inner sleeve: the inner sleeve is of a cylindrical tubular structure, an inner sleeve boss with the caliber smaller than the inner diameter of the inner sleeve and used for fixing and limiting connecting reinforcing steel bars at two ends is arranged in the middle of the inner sleeve, two ends of the inner sleeve boss are inner sleeve deformation areas for embedding and connecting the connecting reinforcing steel bars, an inner sleeve flange of a flange structure is arranged on the peripheral surface of the cylindrical tubular structure, and an inner sleeve cone of a conical surface structure matched with the outer sleeve is arranged at the end part of the cylindrical tubular structure;
the coupling sleeve comprises an outer sleeve: the outer sleeve is sleeved on the outer wall of the inner sleeve and is in clearance fit with the inner sleeve, and the inner wall of one end of the outer sleeve is provided with an outer sleeve cone with a conical surface structure matched with the inner sleeve;
connecting steel bars: the end of the steel bar fixed by the connecting steel bar extending into the inner sleeve is hardened and heat treated, and the length of the end of the steel bar after hardening and heat treatment is more than one fourth of the length of the sleeve.
2. The axial reinforcing bar cold extrusion connection structure of claim 1, characterized in that: and a plurality of groups of inner sleeve wall grooves are axially arranged on the inner sleeve wall to form a multi-petal structure with the radial section of the inner sleeve being centrosymmetric.
3. The axial reinforcing bar cold extrusion connection structure of claim 2, characterized in that: an inner sleeve flange is arranged at one end of the cylindrical tubular structure of the inner sleeve, and a plurality of inner sleeve wall grooves which have one end penetrating through the end surface of the inner sleeve and the other end ending at the front end surface of the inner sleeve flange and divide the inner sleeve into the same multi-petal structure are axially arranged on the inner sleeve wall.
4. The axial reinforcing bar cold extrusion connection structure of claim 3, characterized in that: the outer sleeve is a cylindrical tubular structure with the axial length same as that of the inner sleeve.
5. The axial reinforcing bar cold extrusion connection structure of claim 2, characterized in that: the cylindrical tubular structure middle part sets up the inner skleeve flange, sets up multiunit one end along the axial on the inner skleeve section of thick bamboo wall and link up the inner skleeve terminal surface, the other end ends in the preceding terminal surface of inner skleeve flange, every group along axial symmetric arrangement two, separate into the same inner skleeve section of thick bamboo wall inner skleeve wall groove of orange petal structure.
6. The axial reinforcing bar cold extrusion connection structure of claim 5, characterized in that: the outer sleeves are two cylindrical tubular structures, and the axial length of each outer sleeve is one half of that of the inner sleeve.
7. The axial reinforcing bar cold extrusion connection structure of any one of claims 1 to 6, wherein: the outer wall of the end face of one end or two ends of the inner sleeve is provided with an inner sleeve cone with a conical surface structure matched with the outer sleeve; the included angle alpha between the conical surface of the inner sleeve and the axial direction meets the following requirements: alpha is more than or equal to 0 and less than or equal to 900(ii) a The axial length of the conical surface of the inner sleeve is less than or equal to the length of the inner sleeveOne half to one quarter of the degree.
8. The axial reinforcing bar cold extrusion connection structure of claim 7, characterized in that: the inner wall of the inner sleeve is a smooth surface structure which is provided with threads or concave-convex ring grooves in a processing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122703721.7U CN216340480U (en) | 2021-11-07 | 2021-11-07 | Axial reinforcing steel bar cold extrusion connecting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122703721.7U CN216340480U (en) | 2021-11-07 | 2021-11-07 | Axial reinforcing steel bar cold extrusion connecting structure |
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| CN216340480U true CN216340480U (en) | 2022-04-19 |
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| CN202122703721.7U Active CN216340480U (en) | 2021-11-07 | 2021-11-07 | Axial reinforcing steel bar cold extrusion connecting structure |
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