British plug's fixed knot that participates in constructs

The utility model relates to a british plug's the fixed knot who participates in constructs, include the casing and participate in, the jack is seted up to the bottom of casing has the jack, the jackincludes from last first ladder hole and the second shoulder hole that down sets gradually, the central line of first ladder hole and second shoulder hole lies in same straight line, participate in including following the last fixed part that down sets gradually, connecting portion and work portion, the cross -sectional area of fixed part, connecting portion and work portion increases in proper order, be provided with the protection tube in the second shoulder hole, the connecting portion of participating in are inserted and are located in the protection tube, the fixed part of participating in is inserted and is located first ladder is downthehole, just the upper end of fixed part is outstanding the bottom of casing, the surface of the upper end of fixed part is provided with the flange,the bottom of flange with