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Axial steel bar cold extrusion connecting structure

A connection structure, cold extrusion technology, applied to structural elements, building components, building structures, etc., can solve the problems of complex locking piece processing technology, heavy extrusion tools, slow extrusion speed, etc., and achieve stable and convenient connection processing , avoid human error, increase the effect of connection strength

Pending Publication Date: 2022-01-18
MEISHAN CRRC FASTENING SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing radial cold extrusion connection mainly has the disadvantages of bulky extrusion tools, slow extrusion speed, and unstable joint performance. The axial extrusion speed of the tapered sleeve is faster than that of the straight sleeve radial extrusion, and the extrusion tool is lighter. There are disadvantages such as many structural parts, high cost, and complex locking piece processing technology
The field operability of the threaded connection is poor, the performance of the joint is greatly affected by human operation, and the performance of the joint is unstable; the strength and tensile performance of the conventional joint part are the same as that of the threaded steel bar body, and the extrusion deformation in the extrusion connection is unfavorable to the strength, etc. Factors will affect the performance parameters after connection, and cannot meet the needs of higher strength connections

Method used

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  • Axial steel bar cold extrusion connecting structure
  • Axial steel bar cold extrusion connecting structure
  • Axial steel bar cold extrusion connecting structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, the cold-extruded axial steel bar connecting sleeve is composed of an outer sleeve 1 and an inner sleeve 2 .

[0033] Such as figure 1 , image 3 , Figure 4 , Figure 8 As shown, the connecting sleeve of this example is composed of an inner sleeve 2 and an outer sleeve 1 .

[0034] The inner sleeve 2 is a cylindrical tubular structure, with a symmetrical inner tube structure at both ends for inserting the connecting steel bar 3, including an inner sleeve deformation zone 21 for embedded connection with the connecting steel bar 3, which is fixed in the middle of the sleeve The inner sleeve bosses 22 connected to the reinforcing bars 3 at both ends of the limit, the inner sleeve 2 in this example is provided with multiple groups of inner sleeve wall grooves 23 in the axial direction on the cylinder wall, and the inner sleeve 2 has a cylindrical tubular structure One end of the sleeve is provided with the inner sleeve cone 24 of the tapered surface...

Embodiment 2

[0047] In this embodiment, the cold-extruded axial steel bar connecting sleeve is composed of an outer sleeve 1 and an inner sleeve 2 .

[0048] Such as figure 2 , Figure 6 , Figure 7 , Figure 9 As shown, the connecting sleeve in this example is composed of an inner sleeve 2 and two outer sleeves 1 .

[0049] The inner sleeve 2 is a cylindrical tubular structure, and has a symmetrical inner circular tube structure for inserting the connecting steel bar 3 at both ends, and the deformation zone 21 of the inner sleeve for embedded connection with the connecting steel bar 3 is located in the middle of the sleeve. The inner sleeve boss 22 connected to the steel bar 3 at both ends, the middle part of the cylindrical tubular structure of the inner sleeve 2 in this example, the peripheral surface of the cylindrical tubular structure at the same position as the inner sleeve boss 22 is provided with a flange structure The inner sleeve flange 25, the inner sleeve 2 of this exampl...

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Abstract

The invention discloses an axial steel bar cold extrusion connecting structure. The axial steel bar cold extrusion connecting structure comprises a connecting sleeve and a connecting steel bar which are connected into a whole through extrusion. The connecting sleeve comprises an inner sleeve body and an outer sleeve body. The inner sleeve body is of a cylindrical structure and comprises an inner sleeve boss, an inner sleeve deformation area, an inner sleeve flange and an inner sleeve cone of a conical face structure. The outer sleeve body is arranged on the outer wall of the inner sleeve body in a sleeving manner and is in zero-clearance fit with the inner sleeve body. The outer sleeve body comprises an outer sleeve cone of a conical face structure. The connecting steel bar stretches into the inner sleeve body, and the fixed steel bar end is subjected to hardening heat treatment. According to the connecting sleeve, the metal plastic deformation principle is utilized, a professional pressing riveting tool is used for pushing the outer sleeve body and the inner sleeve body to generate relative movement, the steel bar and the sleeve form a whole, clamping force is generated between the steel bars or rod pieces at the two ends, the steel bar end subjected to hardening heat treatment is suggested to be higher in hardness and higher in tensile force resistance, and the connecting strength is further improved through the arrangement of an inner sleeve wall groove.

Description

technical field [0001] The invention relates to the technical field of connecting structural rods, and relates to a connecting structure of rods, a connecting tool and a connecting method thereof, in particular to a cold extrusion connecting structure of axial steel bars. Background technique [0002] At present, the commonly used steel mechanical connection methods at home and abroad mainly include sleeve radial cold extrusion and tapered sleeve axial extrusion, taper thread, straight thread, upsetting straight thread and grouting sleeve and other connection methods. The existing radial cold extrusion connection mainly has the disadvantages of bulky extrusion tools, slow extrusion speed, and unstable joint performance. The axial extrusion speed of the tapered sleeve is faster than that of the straight sleeve radial extrusion, and the extrusion tool is lighter. There are disadvantages such as many structural parts, high cost, and complex processing technology of the lock pie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C5/16
CPCE04C5/162E04C5/163E04C5/165
Inventor 王旺兵刘宇贾云龙邓涛范亚锋潘飞燕张钦左世斌万永董帅张小连
Owner MEISHAN CRRC FASTENING SYST CO LTD