With the development of building industry, the high-rise building,
large-span space and special structures are more than before. The
application of building rebar is developed towards big
diameter,dense and high strength way. Now it is difficult to
satisfy the need of only using traditional rebar splicing
technology such as jointing & colligation, electrical arc
welding, flare welding, air pressure welding etc. In 1987, Chian
Academy of Building and Research began to research the rebar
mechnical splicing technology which has been developed and used.
The coupler cold forged technology, tapered thread splicing
technology and parallel thread splicing technology have been used
earlier and later. The parallel thread splicing technology can be
divided into upsetting end and rolling end ways. During these 10
years, the rebar splicing technology has been applied quickly. At
present, the parallel rebar splicing technology has been listed as
one of ten national important spreading items.
The characteristics of rebar splicing technology:
1.High strength, safe, reasonable splice pressure.
2.Stalbe quality: the splice producing, setting and inspecting are
all belong to machnical scope, which quality is easy to control and
will not affected by rebar rib, carbon quantity and welding
3.Good economic efficiency: no rebar overlaped splicing,
4.Widen applied field of splice: adaptable for 12-50 same
diameter,different diameter,bending, new and old, advance cover up
rebar of GB 1499, BS 4449, ASTM A615 or ASTM A706 standard.
5.Fast splicing speed: splicing effect is good, sturcture is tight,
good for concrete construction.
6.Good for environment-protection: no light-fire work, no
environment pollution. Can work the whole day and can realize
polite and industrialized producing.