UMBRELLA BODY FOR VERTICAL SHAFT AND METHOD OF BACKFILLING AROUND VERTICAL SHAFT

PROBLEM TO BE SOLVED: To improve work efficiency of backfilling when filling the space between a cylindrical structure 3 and a soil retaining wall 1 surrounding the same, after forming a shaft 4 by building the cylindrical structure 3 in an underground working space 2 excavated surrounded with the s...

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Hauptverfasser:	SAKANASHI TOSHIO, OHASHI MASAAKI, ICHIZAWA JOJO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	EARTH DRILLING EMBANKMENTS EXCAVATIONS FIXED CONSTRUCTIONS FOUNDATIONS GALLERIES HYDRAULIC ENGINEERING INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, ORDISTRIBUTING WATER LARGE UNDERGROUND CHAMBERS MINING SEWERAGE SHAFTS SOIL SHIFTING TUNNELS UNDERGROUND OR UNDERWATER STRUCTURES WATER SUPPLY
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To improve work efficiency of backfilling when filling the space between a cylindrical structure 3 and a soil retaining wall 1 surrounding the same, after forming a shaft 4 by building the cylindrical structure 3 in an underground working space 2 excavated surrounded with the soil retaining wall 1.SOLUTION: An upper end of the cylindrical structure 3 is covered with an umbrella body 10 projecting upward, for example, a quadrangular pyramid shape. As a result, sediment for backfilling can be equally distributed by putting the sediment for backfilling on the umbrella body 10.SELECTED DRAWING: Figure 4 【課題】土留め壁１により囲んで掘削された地中の作業空間２に円筒状の構造体３を建込んで、立坑４を形成した後、円筒状の構造体３とこれを囲む土留め壁１との間を埋戻す際に、埋戻しの作業効率を改善する。【解決手段】円筒状の構造体３の天端に、上向きに凸、例えば四角錐形状の傘体１０を被せる。これにより、埋戻し用の土砂を傘体１０の上に投入することで、埋戻し用の土砂を均等に振分けることができる。【選択図】図４