Abstract: This wooden synthetic beam comprises an integral connection of a pair of upper and lower wooden flange members and a web member comprising a pair of wooden web plates which are provided between the flange members and inwardly curved so that central portions thereof are adhered to each other. The adhesion of the central portions of the pair of inwardly curved wooden web plates can be achieved by providing a vertical web plate lengthwise in a central portion between the curved web plates to adhere them each other through the vertical web plate or directly adhering the central portions together of the curved webs. In the case where the central portions of the curved webs are directly adhered together without provision of the central vertical web, the lengthwisely curved webs are divided in a suitable spaced relation, and a connecting bolt for reinforcement is provided on the divided portion. For the purpose of reinforcement, vertical web plates can be provided on opposite sides of the curved web plates.

Abstract: A floor-concrete grader comprises a frame having a handle, a placing plate unit, which vertically vibrates along the frame, for placing a concrete floor surface and a rolling wheel. The placing plate unit is composed of three placing plates which are different from one another in the form of knife edge and height, the unit being vertically vibrated by a driving means such as a small engine. When the placing plate unit is drawn, while gripping its handle and being vertially vibrated along the frame, on the floor surface which has been just placed with concrete, the placing plates move while continuously placing the concrete floor surface to level the floor surface.