Reinforcing bar splices are key components in reinforced concrete construction. Because mechanical splices do not rely on the surrounding concrete to transfer the force between bars, splitting failures are not a concern, and the strength of the splice is not sensitive to the compressive strength of the concrete or the amount of cover. Splices in reinforcing steel are grouped in three categories: lapped bars, mechanical, or welded; the focus of this report is mechanical splices. Strength capacities established in ACI 318 are higher for mechanical splices than for lap splices. Several types of mechanical splices have been qualified to sustain inelastic reinforcing bar strain excursions representative of those that might be brought about by overload due to seismic activity, wind, or blast. This report provides engineers and contractors with updated information about bar-to-bar mechanical splices and the types of proprietary mechanical splices currently available. There is no attempt to state conditions of acceptance or to endorse or rate one particular mechanical splice over another. The information on mechanical splices and their installation was provided by mechanical splice manufacturers. Although it was compiled by the committee, none of the information was directly verified by the committee. An attempt was made to include generic descriptions of all types of mechanical splices generally available and sold in the North American market at the beginning of 2004; however, some mechanical splices new in the market may not be included due to lack of knowledge of their existence or because no information was submitted for inclusion at the time this report was written. Reasons for using mechanical splices, as well as various engineering considerations that should be made when specifying mechanical splices, are discussed. Mechanical splices are described in terms of seismic type, configuration, installation procedure, clearance requirements, and other characteristics. Illustrations of the various mechanical splices are included. Keywords: dowel; mechanical connection; mechanical splice; reinforced concrete; sleeve; splice.<\/p>\n
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| 3<\/td>\n | CONTENTS CONTENTS <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CHAPTER 1\u2014 GENERAL CHAPTER 1\u2014 GENERAL 1.1\u2014 Introduction 1.1\u2014 Introduction 1.1.1 Report background and scope 1.1.1 Report background and scope 1.1.2 Reinforcing bar designations and grades 1.1.2 Reinforcing bar designations and grades 1.1.3 Type 1 and Type 2 mechanical splices 1.1.3 Type 1 and Type 2 mechanical splices 1.1.4 Categorization of mechanical splices 1.1.4 Categorization of mechanical splices 1.1.5 Definitions 1.1.5 Definitions <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | 1.1.6 Welding 1.1.6 Welding 1.2\u2014Usage 1.2\u2014Usage 1.3\u2014General considerations 1.3\u2014General considerations 1.3.1 Spacing and cover requirements 1.3.1 Spacing and cover requirements <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | 1.3.2 Matching of end alignments, end preparation of \ndeformed bars, use of plain round bars, special bar deformations, \nand equipment 1.3.2 Matching of end alignments, end preparation of \ndeformed bars, use of plain round bars, special bar deformations, \nand equipment 1.3.3 Coated reinforcing bars 1.3.3 Coated reinforcing bars 1.3.4 Stainless steel reinforcing bars 1.3.4 Stainless steel reinforcing bars <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1.3.5 Field erection 1.3.5 Field erection 1.3.6 1.3.6 CHAPTER 2\u2014 DESIGN REQUIREMENTS FOR MECHANICAL SPLICES CHAPTER 2\u2014 DESIGN REQUIREMENTS FOR MECHANICAL SPLICES 2.1\u2014 Codes and specifications 2.1\u2014 Codes and specifications <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 2.2\u2014Design considerations 2.2\u2014Design considerations <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 2.3\u2014Drawings and specifications 2.3\u2014Drawings and specifications CHAPTER 3\u2014 MECHANICAL SPLICES AND INSTALLATION CHAPTER 3\u2014 MECHANICAL SPLICES AND INSTALLATION 3.1\u2014 General 3.1\u2014 General 3.2\u2014Compression-only mechanical splices 3.2\u2014Compression-only mechanical splices 3.2.1 Steel-filled coupling sleeve 3.2.1 Steel-filled coupling sleeve <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3.2.2 Strap-type steel coupling sleeve 3.2.2 Strap-type steel coupling sleeve 3.3\u2014Tension-compression mechanical splices 3.3\u2014Tension-compression mechanical splices 3.3.1 Cold-swaged steel coupling sleeve 3.3.1 Cold-swaged steel coupling sleeve 3.3.2 Cold-swaged coupler with taper-threaded ends 3.3.2 Cold-swaged coupler with taper-threaded ends <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3.3.3 Coupler for thread-like deformed reinforcing bars 3.3.3 Coupler for thread-like deformed reinforcing bars <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 3.3.4 Extruded steel coupler with parallel threaded ends 3.3.4 Extruded steel coupler with parallel threaded ends 3.3.5 Friction-welded bar coupler with parallel threads 3.3.5 Friction-welded bar coupler with parallel threads <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.3.6 Friction-welded coupler with taper-threaded ends 3.3.6 Friction-welded coupler with taper-threaded ends 3.3.7 Grout-filled coupling sleeve 3.3.7 Grout-filled coupling sleeve <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.3.8 Grout-filled coupling sleeve with parallel thread at \nupset bar ends 3.3.8 Grout-filled coupling sleeve with parallel thread at \nupset bar ends 3.3.9 Grout-filled coupling sleeve with taper thread 3.3.9 Grout-filled coupling sleeve with taper thread 3.3.10 Shear screw and rail coupling sleeve 3.3.10 Shear screw and rail coupling sleeve <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 3.3.11 Shear screw and wedge coupling sleeve 3.3.11 Shear screw and wedge coupling sleeve 3.3.12 Steel-filled coupling sleeve 3.3.12 Steel-filled coupling sleeve 3.3.13 Taper-threaded steel coupler 3.3.13 Taper-threaded steel coupler <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 3.3.14 Threaded coupler with standard national coarse \nthreads 3.3.14 Threaded coupler with standard national coarse \nthreads <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 3.3.15 Threaded coupler with upsized bar threads, coldforged 3.3.15 Threaded coupler with upsized bar threads, coldforged 3.3.16 Threaded coupler with upsized bar threads, hotforged 3.3.16 Threaded coupler with upsized bar threads, hotforged 3.3.17 Upset bar and coupling sleeve with straight \nthreads 3.3.17 Upset bar and coupling sleeve with straight \nthreads <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 3.4\u2014Dowel bar mechanical splices 3.4\u2014Dowel bar mechanical splices 3.4.1 Cold-swaged steel flanged coupler with taperthreaded \nends 3.4.1 Cold-swaged steel flanged coupler with taperthreaded \nends 3.4.2 Coupler with standard national coarse threads and \nflange 3.4.2 Coupler with standard national coarse threads and \nflange <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 3.4.3 Coupler with taper threads and mounting plate 3.4.3 Coupler with taper threads and mounting plate 3.4.4 Integrally forged coupler with flange 3.4.4 Integrally forged coupler with flange 3.5\u2014Mechanical lap splices 3.5\u2014Mechanical lap splices <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 3.5.1 Shear screw and double-wedge coupling sleeve 3.5.1 Shear screw and double-wedge coupling sleeve 3.5.2 Steel coupling sleeve with wedge 3.5.2 Steel coupling sleeve with wedge CHAPTER 4\u2014 SUMMARY CHAPTER 4\u2014 SUMMARY <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | CHAPTER 5\u2014 REFERENCES CHAPTER 5\u2014 REFERENCES 5.1\u2014 Referenced standards and reports 5.1\u2014 Referenced standards and reports 5.2\u2014Cited references 5.2\u2014Cited references ACKNOWLEDGMENTS ACKNOWLEDGMENTS <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | NOTICES AND DISCLAIMERS NOTICES AND DISCLAIMERS <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" 439.3R-07 Types of Mechanical Splices for Reinforcing Bars<\/b><\/p>\n |