The aggregation structure according to an embodiment of the present invention includes a first aggregation member including a first coupling groove and a first coupling protrusion formed on both edges, respectively, a second coupling groove formed on both edges and engaged with the first coupling groove, respectively. A second aggregating member 200 including a second coupling groove engaged with the coupling protrusion and the first coupling protrusion, and a wedge inserted into the gap between the second coupling protrusion and the first coupling groove to press the second coupling protrusion, The first coupling groove includes a first groove that is formed to cross the first merging member in the width direction and is connected to the first groove and the first groove, and includes a second groove in a semicircular shape, and the second coupling protrusion is formed in a second merging process. It is formed across the member in the width direction, and includes a first protrusion having the same width, and a second protrusion protruding from the first protrusion in the longitudinal direction of the second aggregation member and having the same planar shape as the second groove.
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