| 摘要 |
PURPOSE: A 3m concrete mold is provided to obtain test piece in fine state by not leading high temperature of the summer season or low temperature of winter season into the inside of the mold. CONSTITUTION: Each inner part of half cylinder body, lid, and board are formed by inserting the insulating material. By emitting whole of each half cylinder body, a plurality of projection, in which upper side is round, and a plurality of grooves, which are corresponding to the projections, are selectively formed in the connection part of each half cylinder body. The lid and the board is formed as "�� type in the section and forms the inside diameter identical with the external diameter of the half cylinder body and be fitted in the outer side of the half cylinder body. The groove of "�� type is formed symmetrically inside the lid and the board. In the outer side of each half cylinder body, form the projection, which is corresponding to the "�� type groove, and insert and couples the lid and the board in each outer side of the half cylinder body. |
