Broken granite (broken granite) - Wariguriishi

Japanese: 割りぐり石(割栗石) - わりぐりいし

Crushed stone with a diameter of about 12 to 20 cm used in foundation construction. The name is thought to have come from the fact that round stones with a diameter of about 10 to 15 cm found on riverbanks were called kuriishi. When constructing the foundations of roads, walls, fences, and buildings, crushed stones are used in the process of compacting the ground. In crushed stone construction, the ground is first leveled, and then the crushed stones are densely arranged on a set of rafters, and gravel mixed with sand, called cut gravel, is filled in between the gaps to fill them, and the stone is compacted by hand or with a rammer. Concrete (called 'samurai concrete') is then generally poured on top of the stone.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

基礎工事などに用いられる直径12～20cmくらいの砕石。河原にある直径10～15cmくらいの丸石をくり石と呼んでいたことから，この名が出たものと考えられる。道路や塀，垣や，建造物の基礎工事を行うとき，地盤を締め固める目的で割りぐり石を用いた割りぐり地業が行われる。割りぐり地業は，まず地盤を平らに整えた後，割りぐり石をこばだてにたてて密に並べ，切込砂利という，砂を混ぜた砂利をその隙間に目つぶしとしてつめ，人力またはランマーなどで突き固めたもので，一般にその上にコンクリート(捨てコンクリートと呼ばれる)が打たれる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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