![]() Shear screw and double wedge coupling sleeve and steel coupling sleeve with wedge are two examples of mechanical lap splices. Therefore, mechanical lap splices are considerably suitable for repairing structures because smaller concrete area need to be removed compared with lap splices. Therefore, if such condition is not guaranteed, then it is recommended to avoid its use.Ĭomparatively, mechanical lap splices are shorter than lap splices because of the use of coupling sleeves to connect reinforcement bars. This type of splice is suitable for the case where tension forces are present only. Upset bar and coupling sleeve with straight threadsįig.5: Cold Swaged Coupler with Taper Threaded Endįig.6: Coupler for Thread-Like Deformed Reinforcing Barsįig.7: Extruded Steel Coupler with Parallel Threaded Ends Mechanical Lap Splices or Tension Only Splices Threaded coupler with upsized bar threads, hot forged Threaded coupler with upsized bar threads, cold forged Threaded coupler with standard national coarse threads Grout-filled coupling sleeve with taper thread Grout-filled coupling sleeve with parallel thread at upset bar ends Size ranges of steel bar suitable to be splicedĬold-swaged coupler with taper-threaded endsĬoupler for thread-like deformed reinforcing barsĮxtruded steel coupler with parallel threaded endsįriction-welded bar coupler with parallel threadsįriction-welded coupler with taper-threaded ends Table-1: Tension and Compression Mechanical Splice Types, Their Designated Steel Number, Steel Bar Type and Applications Tension-compression mechanical splice type Number of tension and compression mechanical splices is shown from Figure-4 to Figure-7. Tension and compression mechanical splices types, designated bar sizes to be spliced by each splice type, the grade of the steel bar which is spliced using certain type of tension and compression mechanical splice, and installation condition of each mechanical splices are provided in Table-1. There are sizable numbers of commercially manufactured tension and compression mechanical splices. This type of mechanical splice can resist tension and compression stress. Tension and Compression Mechanical Splices for Rebars ![]() It should be known that the end of the rebars need to be saw cut in the case of strap type steel coupling sleeve, but no special end preparation is needed for steel filled coupling sleeve. 57 whereas the latter is suitable for splicing bar size ranges from No.22 to No.57.įig.2: Steel Filled Coupling Sleeve Spliceįig.3: Strap Type Steel Coupling Sleeve Splice The former can be used to splice rebar sizes ranges from No. Steel filled coupling sleeve and strap type steel coupling sleeve are the two most commonly used examples of end bearing splices. Therefore, if this condition cannot be guaranteed, then it is advised to avoid the use of compression only mechanical splices for reinforcement bars. The compressive stress is transferred by vertical bearing from one bar to another one.Ĭompression only mechanical splices can be used when tension stress is not occurred. Mechanical lap splices or tension only mechanical spliceįig.1: Mechanical Splices for Reinforcement Bars Compression Only Mechanical Splices or End Bearing SplicesĪs it may be noticed from its name, this type of splice can resist compression stress merely.Tension and compression mechanical splices.Compression only mechanical splices or end bearing splices.There are four major types of mechanical splices: Mechanical Lap Splices or Tension Only Splices.Tension and Compression Mechanical Splices for Rebars.Compression Only Mechanical Splices or End Bearing Splices.
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