FREE GRADIENT SIDE DITCH BLOCK

PROBLEM TO BE SOLVED: To provide a free gradient side ditch block capable of efficiently collecting and draining rainwater, and having high resistance.SOLUTION: A precast concrete free gradient side ditch block (1) of the so-called gate-shaped structure for constructing a free gradient side ditch is constituted of a top plate (3) being a rectangular shape in an upper surface shape and having a predetermined thickness and a pair of side plates (4) connected to a pair of long sides of a rectangular shape and having the predetermined thickness. A belt-like groove (7) of a predetermined width of a belt shape is formed in a central part of an upper surface (6) of the top plate (3). That is, a pair of inclined planes (9 and 10) of a predetermined width are formed from a pair of long sides of a rectangular shape of the upper surface (6), and thereby, the belt-like groove (7) of extending in the long side direction is formed in the center of the upper surface. A slit (12) parallel to the short side of the rectangular shape is opened by one or a plurality by penetrating the top plate (3) through this belt-like groove (7).SELECTED DRAWING: Figure 1 【課題】雨水を効率よく集水・排水でき、高い耐性を備えた自由勾配側溝ブロックを提供する。【解決手段】自由勾配側溝を構築する、いわゆる門型構造のプレキャストコンクリート製の自由勾配側溝ブロック（１）を、上面形状が長方形で所定厚さの頂板（３）と、長方形の一対の長辺に接続されている所定厚さの一対の側板（４）とから構成する。頂板（３）の上面（６）の中央部に帯状の所定幅の帯状溝（７）を形成する。つまり上面（６）の長方形の一対の長辺から所定幅の一対の斜面（９、１０）を形成し、それによって上面の中央に長辺方向に延びる帯状溝（７）を形成する。この帯状溝（７）に、頂板（３）を貫通し長方形の短辺と平行なスリット（１２）を１個または複数個明ける。【選択図】図１