| 摘要 |
A drain board for the underground bottom is provided to prevent an inflow of cement mortar in a drainageway and to secure a drainageway by forming a maze type interlocking connection structure with interlocking sockets and interlocking projections and keeping tightly. A drain board for the underground bottom comprises a drain board(10) having many support posts provided with concrete placing grooves(11), projected downward, arranged in a lattice shape to have a drainageway between the support posts and connected with stiffening ribs to keep the stiffness of the drain board, interlocking sockets(20) formed on two adjacent sides at the circumference of the drain board and provided with mounting grooves(21) to insert interlocking projections of another drain board tightly, and interlocking projections(30) formed on two corresponding sides to the interlocking sockets and mounted to interlocking sockets of another drain board to form a maze type interlocking connection structure. |
