HYDROPHOBIC MATERIAL FOR CULVERT, METHOD OF MANUFACTURING THE HYDROPHOBIC MATERIAL, CULVERT, AND METHOD OF CONSTRUCTING THE CULVERT

摘要

PROBLEM TO BE SOLVED: To provide a hydrophobic material for a culvert preventing a culvert drain from being alkalified, an insoluble iron hydroxide from re-flowing out, reduced in weight, and manufactured inexpensively. SOLUTION: This method of manufacturing a hydrophobic material for a culvert comprises a primary crushing step of crushing raw stones collected from the ground of siliceous mudstone to an average particle size of 150 mm or smaller and a secondary crushing step of crushing the siliceous mudstone crushed in the primary crushing step to an average particle size of 80 mm or smaller. More suitably, the method further comprises a sieving step of taking out the siliceous mudstone of 5 mm or larger in particle size from the siliceous mudstone crushed in the secondary crushing step by a sieving machine for sieving. The method of constructing the culvert comprises: an excavating step of excavating a culvert groove; a culvert pipe laying step of laying down culvert pipes at the groove bottom of the culvert groove; a hydrophobic material charging step of placing the siliceous mudstone of 80 mm or smaller in average grain size and 5 mm or larger in particle size to a predetermined depth from the groove bottom of the culvert groove; and a backfilling step for backfilling the soil excavated in the excavating step for forming the upper layer of the hydrophobic material for the culvert. COPYRIGHT: (C)2009,JPO&INPIT