CONSTRUCTION METHOD OF FILLER APPLIED TO INSIDE OF UNDERGROUND PIPE STRUCTURE AND UNDERGROUND PIPE STRUCTURE

To provide a construction method of filler, to be applied between inner pipes and outer pipes of an underground pipe structure comprised of a plurality of double pipes of inner pipes and outer pipes, a cable passing through each of the inner pipes, the construction method of filler being capable of avoiding damage or performance degradation of a communication cable in the inner pipe, in applying filler between the inner pipe and the outer pipe, without causing the possibility of a filling effect becomes insufficient due to a filling failure.SOLUTION: The construction method is a construction method of filler to be applied between inner pipes and outer pipes of an underground pipe structure comprised of a plurality of double pipes of inner pipes and outer pipes, a cable passing through each of the inner pipes, uses a low heat type filler with a density of 1.15-1.35 kg/L.SELECTED DRAWING: Figure 2 【課題】内管と外管の二重管より成り、内管内部にケーブルを通してある地中埋設管構造の内管と外管の間への充填材の施工方法に関し、当該地中埋設管構造を大きく開削することなく、内管と外管の間に充填材を充填する場合において、内管内の通信ケーブルの損傷や性能劣化を引き起こすことがなく、充填不良により充填効果が不十分となる虞が無い、充填材の施工方法を提供すること。【解決手段】複数の内管と一の外管の二重管より成り、内管内部にケーブルを通してある地中埋設管構造の内管と外管の間への充填材の施工方法であって、密度が１．１５〜１．３５ｋｇ／Ｌである低発熱型充填材を用いることを特徴とする充填材の施工方法。【選択図】図２