NATURAL GROUND REINFORCEMENT STRUCTURE AND NATURAL GROUND REINFORCEMENT METHOD
To provide natural ground reinforcement structure and a natural ground reinforcement method, which can prevent backflow of a chemical solution into a reinforcement body, can make pressure control unnecessary in injecting the chemical solution, and can prevent leakage of a consolidation material from...
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Zusammenfassung: | To provide natural ground reinforcement structure and a natural ground reinforcement method, which can prevent backflow of a chemical solution into a reinforcement body, can make pressure control unnecessary in injecting the chemical solution, and can prevent leakage of a consolidation material from a bore hole while restraining steep rising of a construction cost and lengthening of construction time.SOLUTION: In natural ground reinforcement structure 100, a reinforcement body 30 comprises: communication holes 36 that communicate an inside hollow 34 and an outer peripheral surface 35 and are provided at a base end 33 side; and an opening 37 through which the hollow 34 leads to a bore hole 20 and which is provided at a tip side. A mesh sheet 40 enclosing the communication holes 36 and a packer 50 enclosing the mesh sheet 40 are fitted to the reinforcement body 30. The mesh sheet 40 comprises meshes to permit passage of a liquid consolidation material 70 and not permit passage of a polymer cell configured by foaming the passed liquid consolidation material 70. The packer 50 expands by the foamed consolidation material 70 and blocks gaps 25 at an inlet 22 side of the bore hole 20.SELECTED DRAWING: Figure 6
【課題】薬液の補強体の内部への逆流を防止でき、薬液注入の際の圧力管理を不要にでき、工費の高騰と施工時間が長くなることを抑制しながら、ボアホールからの固結材の漏洩を防止することのできる、地山補強構造と地山補強方法を提供する。【解決手段】地山補強構造100において、補強体30には、内部の中空34と外周面35とを連通する連通孔36がその基端33側に設けられ、先端側には中空34がボアホール20に通じる開口37が設けられ、連通孔36を包囲するメッシュシート40とメッシュシート40を包囲するパッカー50が補強体30に装着されており、メッシュシート40は、液状の固結材70の通過を許容し、通過した液状の固結材70が発泡してなるポリマーセルの通過を許容しない開き目を備え、パッカー50は、発泡した固結材70によって膨張され、ボアホール20入り口22側において隙間25を閉塞している。【選択図】図6 |
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