Building engineering dedicated connection spare

The utility model provides a building engineering dedicated connection spare, including connecting sleeve no. 1 and connecting sleeve no. 2, a connecting sleeve one end is provided with the recess, two one end of connecting sleeve are provided with protruding piece, protruding piece is installed in the recess through the axis of rotation, on connecting sleeve no. 1 and the connecting sleeve no. 2all the cover be equipped with and move movable sleeve, it is provided with the track groove on the movable sleeve to move, all be provided with the connecting block on connecting sleeve no. 1 and theconnecting sleeve no. 2, the connecting block sets up at the track inslot, it is provided with the dog on the movable sleeve to move, the dog sets up in connecting block one end, connecting sleeve no. 1, connecting sleeve no. 2 and move the movable sleeve top and all be provided with the screw socket with the bottom, be provided with the screw rod in the screw socket, all be provided with the recess on connecting sleeve n