PROBLEM TO BE SOLVED: To provide a structure of a planting base that can healthfully grow trees planted in a place unsuitable as a planting environment without degrading the supporting yield strength of the ground directly under an existing structure.SOLUTION: The structure of the planting base uses a granular material 50 for forming a porous structure, and a plant growth base material 40 filled in voids of the granular material presenting the porous structure. Holes for storing root balls for shrubs 32 and trees 33 are excavated from the ground, and root elongation regions of the shrubs 32 and elongation regions of the trees 33 are structurally divided and stored in these holes 13. Backfilling parts are formed to have rough voids only with the granular material 50, and consolidated filling parts are formed with the plant growth base material 40 filling the voids of the granular material.COPYRIGHT: (C)2012,JPO&INPIT【課題】既設構造物の直下地盤の支持耐力を低下させることなく、植栽環境として相応しくない場所に植栽した樹木を健全に生育できる、植栽用基盤の構造を提供すること。【解決手段】ポーラス構造体を形成するための粒状物50と、ポーラス構造を呈する粒状物の空隙内に充填する植物生育基盤材40とを使用し、低木32および高木33の根鉢を収容可能な穴を地上から掘削し、この穴13内に、低木32の根系伸長域と高木33の伸長域を構造的に区分けして収容し、粒状物50のみによる粗空隙を持つように埋戻部分を形成するとともに、粒状物の空隙を埋める植物生育基盤材40により圧密充填部分を形成した。【選択図】図3
