CONCRETE DAM BANK BODY AND BUILDING METHOD THEREOF AND BLOCK

PROBLEM TO BE SOLVED: To provide upper stream and downstream outer layers with durability as set by a method wherein the upper stream and downstream outer layers are formed of rich-mix concrete and the interior of a bank body surrounding the outer layers is formed of lean-mix concrete. SOLUTION: By superposing concrete blocks A and B for an outer layer made of rich-mix concrete with each other, upper stream and downstream outer layers are formed and lean-mix concrete 35 is placed between the upper stream outer layer and a downstream outer layer to form the interior of a bank body. After the concrete blocks A and B for an outer layer at a first stage are arranged on a given foundation concrete (e) by means of proper auxiliary blocks 33 and 34, the lean-mix concrete 35 is placed up to a half of the overall heights of the concrete blocks A and B for an outer layer at a first stage and the lean-mix concrete forms a concrete layer (d) at a first stage of the interior of the bank body, and by repeating this work, construction is effected. This method uses the concrete blocks A and B for an outer layer as forms.