JP5967840B2 - Injection agent used for ground improvement method - Google Patents
Injection agent used for ground improvement method Download PDFInfo
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- JP5967840B2 JP5967840B2 JP2014260573A JP2014260573A JP5967840B2 JP 5967840 B2 JP5967840 B2 JP 5967840B2 JP 2014260573 A JP2014260573 A JP 2014260573A JP 2014260573 A JP2014260573 A JP 2014260573A JP 5967840 B2 JP5967840 B2 JP 5967840B2
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- 239000003795 chemical substances by application Substances 0.000 title claims description 45
- 238000002347 injection Methods 0.000 title claims description 31
- 239000007924 injection Substances 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 15
- 239000002562 thickening agent Substances 0.000 claims description 47
- 239000000945 filler Substances 0.000 claims description 39
- 238000010276 construction Methods 0.000 claims description 20
- 239000002904 solvent Substances 0.000 claims description 15
- 239000008187 granular material Substances 0.000 claims description 8
- 150000004696 coordination complex Chemical class 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 6
- 229920003169 water-soluble polymer Polymers 0.000 claims description 6
- 229910021645 metal ion Inorganic materials 0.000 claims description 5
- 238000005243 fluidization Methods 0.000 claims 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 12
- 238000005086 pumping Methods 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000011236 particulate material Substances 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Foundations (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
本発明は、地盤を締め固めて密度を増加させることで液状化の発生を抑制する地盤改良工法に用いられる注入剤に関するものである。 The present invention relates to an injection used in a ground improvement method that suppresses the occurrence of liquefaction by increasing the density by compacting the ground.
臨海部等の軟弱な地盤は地震に伴って液状化が発生し得ることが知られている。このような液状化の発生を抑制するものとして、地盤内に注入剤を圧送し、注入剤の体積増加の分だけ注入剤の周辺が締め固められて地盤の密度が増大する地盤改良工法が知られている（例えば、特許文献１、２参照）。 It is known that soft ground such as coastal areas can be liquefied with earthquakes. In order to suppress the occurrence of such liquefaction, there is known a ground improvement method in which the injection is pumped into the ground and the periphery of the injection is compacted by the volume increase of the injection to increase the density of the ground. (For example, see Patent Documents 1 and 2).
特許文献１記載の地盤改良工法は、注入剤としてモルタルを用いている。注入剤は、振動や衝撃を加えられることなく、地盤に注入され、地盤内で球根状の固結体を形成する。固結体が形成されて体積が増加した分だけ周辺の地盤が圧縮され、締め固められる。 The ground improvement construction method described in Patent Document 1 uses mortar as an injection agent. The injection agent is injected into the ground without being subjected to vibration or impact, and forms a bulb-like solidified body in the ground. The surrounding ground is compressed and compacted as much as the solid body is formed and the volume is increased.
特許文献２記載の地盤改良工法は、水と流動化剤と遅行性塑性化剤とを含む注入剤を用いている。注入剤は、砂と混合された上で地盤内に圧入され砂杭を形成することにより、周辺の地盤が締め固められる。 The ground improvement construction method described in Patent Document 2 uses an injection containing water, a fluidizing agent, and a lagging plasticizing agent. The injecting agent is mixed with sand and pressed into the ground to form a sand pile, thereby compacting the surrounding ground.
しかしながら、上述したようなモルタルの注入剤は、地盤中に固結体が残存し続けるため、配管敷設工事等で地盤を掘り起こしたり掘削する場合には、固結体が工事を阻害するという問題があった。 However, since the mortar injectant as described above continues to remain in the ground, there is a problem that when the ground is dug up or excavated by piping laying work or the like, the solid body obstructs the construction. there were.
流動化材と遅行性塑性化材とを含む注入剤は、別々に保管された流動化剤と遅行性塑性剤とを施工直前に混合しなければならない上、流動化材と遅行性塑性化材とを均等に混合するために長時間撹拌し続けなければならず、施工現場での作業負担が重いという問題があった。 In the case of an injection containing a fluidizing material and a lagging plasticizer, a fluidizing agent and a lagging plasticizer stored separately must be mixed immediately before construction, and the fluidizing material and the lagging plasticizer are mixed. In order to mix them uniformly, there is a problem that the work load on the construction site is heavy because it has to be continuously stirred for a long time.
そこで、作業効率に優れ、地盤内で塑性化可能な地盤改良工法に用いられる注入剤を実現するために解決すべき技術的課題が生じてくるのであり、本発明はこの課題を解決することを目的とする。 Therefore, there is a technical problem to be solved in order to realize an injection used in the ground improvement method that is excellent in work efficiency and can be plasticized in the ground, and the present invention solves this problem. Objective.
本発明は上記目的を達成するために提案されたものであり、請求項１記載の発明は、増粘剤と該増粘剤を溶解させる溶剤とを含有し、粒状材料と混合されて流動化充填材を形成し、該流動化充填材で地盤を締め固めて密度を増加させる地盤改良工法に用いられる注入剤において、前記増粘剤は、中性水溶性高分子であり、前記注入剤は、前記地盤への注入前にＪＩＳＺ８８０３に準拠して測定された粘度が１００〜５０００ｍＰａ・ｓに設定され、前記地盤への注入後に地盤内で前記増粘剤と金属イオンとが結合して金属錯体を生成し、前記増粘剤の分子サイズが一定のまま前記溶剤に対する前記増粘剤の親和性が低下し前記増粘剤が分解されて前記粘度が低下して、前記流動化充填材を塑性化させるＰａ・ｓに設定され、前記地盤への注入後に前記地盤内で分解されて粘性が低下する地盤改良工法に用いられる注入剤を提供する。 The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 contains a thickener and a solvent for dissolving the thickener, and is mixed with a granular material to be fluidized. In an injecting agent used in a ground improvement method for forming a filler and compacting the ground with the fluidized filler to increase the density, the thickener is a neutral water-soluble polymer, and the injecting agent is The viscosity measured according to JISZ8803 before injection into the ground is set to 100 to 5000 mPa · s, and after the injection into the ground, the thickener and metal ions are combined in the ground to form a metal complex. The viscosity of the thickener is degraded by the degradation of the viscosity of the thickener, the viscosity of the thickener is decomposed, and the fluidized filler is plasticized. Is set to Pa · s, and is injected into the ground Is decomposed in said ground and viscous to provide an injection agent used in ground improvement method to decrease the.
この構成によれば、注入剤の粘度が１００〜５０００ｍＰａ・ｓに設定されることにより、注入剤と粒状材料とを混合した流動化充填材を地盤内に圧送する際に、配管の目詰まりを抑制可能な流動性を確保することができる。また、増粘剤が地盤中で分解されて注入剤の粘性が低下して、流動化充填材が地盤中で塑性化することにより、地盤内に固化物が残らないため、施工後に工事等で地盤を掘り起こしたり掘削する場合であっても、流動化充填材が障害となり工事等を妨げることを回避することができる。さらに、増粘剤と溶剤とを混合して成る注入剤を粒状材料と混練することにより、砂が均一に練り混ぜられた流動化充填材を得ることができる。 According to this configuration, when the viscosity of the injection agent is set to 100 to 5000 mPa · s, when the fluidized filler in which the injection agent and the particulate material are mixed is pumped into the ground, the clogging of the pipe is prevented. Controllable fluidity can be ensured. In addition, since the thickener is decomposed in the ground and the viscosity of the injection agent is lowered, and the fluidized filler is plasticized in the ground, no solidified material remains in the ground. Even when the ground is dug up or excavated, it can be avoided that the fluidized filler becomes an obstacle and hinders the construction and the like. Furthermore, a fluidized filler in which sand is uniformly kneaded can be obtained by kneading an injectant obtained by mixing a thickener and a solvent with a granular material.
また、中性水溶性高分子から成る増粘剤が、地盤中で金属錯体を生成して分子サイズが変化することなく分解されることにより、注入剤が分解されて溶剤を排出するため、工事等で地盤を掘り返す場合であっても、流動化充填材が障害となり工事等を妨げることを回避することができる。 Further, since the thickening agent comprising a neutral water-soluble polymer, the Rukoto degraded without changing the molecular size and generates a metal complex in ground, infusate is being decomposed discharging solvent, construction Even when the ground is dug up, etc., it can be avoided that the fluidized filler becomes an obstacle and hinders the construction.
請求項２記載の発明は、請求項１又は２記載の発明において、前記粘度は、１００〜４００ｍＰａ・ｓである地盤改良工法に用いられる注入剤を提供する。 According to a second aspect of the invention of claim 1 or 2, wherein said viscosity provides an infusate to be used in ground improvement method is 100~400mPa · s.
この構成によれば、流動化充填材を地盤に圧送する際に配管の目詰まりを更に抑制することができる。 According to this structure, clogging of piping can be further suppressed when the fluidized filler is pumped to the ground.
請求項３記載の発明は、請求項３記載の発明において、前記粘度は、２００〜３００ｍＰａ・ｓである地盤改良工法に用いられる注入剤を提供する。 According to a third aspect, the invention of claim 3, wherein said viscosity provides an infusate to be used in ground improvement method is 200~300mPa · s.
この構成によれば、流動化充填材が配管内で目詰まりすることなく、ポンプが流動化充填材を地盤にスムーズに圧送可能なため、流動化充填材を更に円滑に圧送することができる。 According to this structure, since the pump can smoothly pump the fluidized filler to the ground without clogging the fluidized filler in the pipe, the fluidized filler can be pumped more smoothly.
請求項４記載の発明は、請求項１乃至４の何れか１項記載の発明において、前記増粘剤の平均分子量が、５万以上である地盤改良工法に用いられる注入剤を提供する。 The invention of claim 4, wherein, in the invention of any one of claims 1 to 4, an average molecular weight of the thickener, to provide an injection agent used in ground improvement method is 50,000 or more.
この構成によれば、注入剤の粘度が注入剤の平均分子量に比例して上がるため、注入剤中の増粘剤濃度に係らず、流動化充填材を圧送する際に好ましい流動性を確保することができる。 According to this configuration, since the viscosity of the injecting agent increases in proportion to the average molecular weight of the injecting agent, favorable fluidity is ensured when pumping the fluidized filler regardless of the thickener concentration in the injecting agent. be able to.
請求項５記載の発明は、請求項５記載の発明において、前記増粘剤の平均分子量が、２００万以上である地盤改良工法に用いられる注入剤を提供する。 According to a fifth aspect, in the fifth aspect of the present invention, the average molecular weight of the thickener, to provide an injection agent used in ground improvement method is 2,000,000 or more.
この構成によれば、注入剤の粘度が上がるため、注入剤中の増粘剤濃度が低濃度であっても、流動化充填材を圧送する際に好ましい流動性を確保することができる。 According to this configuration, since the viscosity of the injecting agent is increased, preferable fluidity can be ensured when the fluidized filler is pumped even if the thickener concentration in the injecting agent is low.
本発明は、地盤内に圧送し易い流動化充填材の流動性を確保すると共に、注入剤が地盤中で塑性化されて、流動化充填材が障害となり工事等を妨げることを回避することができる。 The present invention secures the fluidity of the fluidized filler that can be easily pumped into the ground, and avoids that the infusate is plasticized in the ground and the fluidized filler becomes an obstacle and hinders construction and the like. it can.
本発明に係る地盤改良工法に用いる注入剤は、作業効率に優れ、地盤内で塑性化可能な地盤改良工法に用いられる注入剤を提供するという目的を達成するために、増粘剤と増粘剤を溶解させる溶剤とを含有し、粒状材料と混合されて流動化充填材を形成し、流動化充填材で地盤を締め固めて密度を増加させる地盤改良工法に用いられる注入剤において、増粘剤は、中性水溶性高分子であり、注入剤は、地盤への注入前にＪＩＳＺ８８０３に準拠して測定された粘度が１００〜５０００ｍＰａ・ｓに設定され、地盤への注入後に地盤内で増粘剤と金属イオンとが結合して金属錯体を生成し、増粘剤の分子サイズが一定のまま溶剤に対する増粘剤の親和性が低下し増粘剤が分解されて粘度が低下して、流動化充填材を塑性化させることで実現した。 In order to achieve the purpose of providing an injection agent used in the ground improvement construction method that is excellent in work efficiency and can be plasticized in the ground, the injection agent used in the ground improvement construction method according to the present invention is a thickener and a thickening agent. In an injecting agent used in ground improvement methods that contain a solvent that dissolves the agent, mix with the particulate material to form a fluidized filler, and compact the ground with the fluidized filler to increase the density. The agent is a neutral water-soluble polymer, and the injectant has a viscosity measured according to JISZ8803 before injection into the ground, set to 100 to 5000 mPa · s, and increases in the ground after injection into the ground. The thickener and the metal ion combine to form a metal complex, the viscosity of the thickener is degraded and the viscosity is reduced due to a decrease in the affinity of the thickener to the solvent while the molecular size of the thickener remains constant , Realized by plasticizing fluidized filler
以下、本発明の一実施例に係る注入剤を用いる地盤改良工法の地盤改良装置１について、図面に基づいて説明する。なお、以下において、「上」、「下」の語は、上下方向における上方、下方に対応するものとする。 Hereinafter, the ground improvement apparatus 1 of the ground improvement construction method using the injection according to one embodiment of the present invention will be described with reference to the drawings. In the following, the terms “upper” and “lower” correspond to the upper and lower parts in the vertical direction.
図１は、地盤改良装置１を示す模式図である。図１に示すように、地盤改良装置１は、ミキシングプラント２と、圧送手段としての圧送ポンプ３と、ボーリングマシン４、を備えている。 FIG. 1 is a schematic diagram showing a ground improvement device 1. As shown in FIG. 1, the ground improvement device 1 includes a mixing plant 2, a pumping pump 3 as a pumping means, and a boring machine 4.
ミキシングプラント２は、サイロ２ａから供給される増粘剤と溶剤タンク２ｂから供給される溶剤とを混合して、注入剤としての流動化剤を製造する。また、ミキシングプラント２は、流動化剤と投入される粒状材料Ｍとを混練して、流動化充填材を製造する。このように、増粘剤と溶剤とを混合して成る流動化剤を粒状材料Ｍと混練することにより、粒状材料Ｍが均一に練り混ぜられた流動化充填材を得ることができる。なお、流動化剤の生成は、ミキシングプラント２内で行われるものに限定されず、例えば、増粘剤と溶剤とを予め混合して生成された流動化剤をミキシングプラント２に投入しても構わない。 The mixing plant 2 mixes the thickener supplied from the silo 2a and the solvent supplied from the solvent tank 2b to produce a fluidizing agent as an injection agent. In addition, the mixing plant 2 kneads the fluidizing agent and the granular material M to be added to produce a fluidized filler. Thus, by kneading the fluidizing agent obtained by mixing the thickener and the solvent with the granular material M, a fluidized filler in which the granular material M is uniformly kneaded can be obtained. The production of the fluidizing agent is not limited to that performed in the mixing plant 2. For example, even if a fluidizing agent produced by mixing a thickener and a solvent in advance is added to the mixing plant 2. I do not care.
圧送ポンプ３は、ミキシングプラント２とボーリングマシン４との間に連結されており、ミキシングプラント２内の流動化充填材をロッド４ａに圧送するものである。圧送ポンプ４は、流動化充填材をボーリングマシン４に供給可能なものであればよく、例えば、コンクリートポンプ等が考えられるが、これに限定されるものではない。 The pressure feed pump 3 is connected between the mixing plant 2 and the boring machine 4, and feeds the fluidized filler in the mixing plant 2 to the rod 4a. The pumping pump 4 may be any pump that can supply the fluidized filler to the boring machine 4. For example, a concrete pump is conceivable, but the present invention is not limited to this.
ボーリングマシン４は、図示しないロータリーパーカッションドリル等で削孔された縦孔内に挿通される中空のロッド４ａを備えており、ロッド４ａの先端から流動化充填材が縦孔内に流入する。地盤Ｇ内の所望の位置に球根状の塊状体Ｌが造成されたら、ロッド４ａを上方に引き抜き、再度流動化充填材を縦孔内に流入させる。これにより、地盤Ｇ内に上下方向に沿って流動化充填材から成る塊状体Ｌを造成する。 The boring machine 4 includes a hollow rod 4a that is inserted into a vertical hole drilled by a rotary percussion drill or the like (not shown), and fluidized filler flows into the vertical hole from the tip of the rod 4a. When the bulbous lump L is formed at a desired position in the ground G, the rod 4a is pulled upward, and the fluidized filler is again flowed into the vertical hole. Thereby, the lump body L made of the fluidized filler is formed in the ground G along the vertical direction.
次に、流動化剤について説明する。流動化剤は、増粘剤と溶媒とを含有している。流動化剤は、粒状材料Ｍと混合されることにより、流動化充填材に成る。溶媒は、増粘剤を溶解させるものであり、例えば、水、有機溶媒である。粒状材料Ｍは、従来の地盤改良工法で用いられていた公知の材料であり、例えば、砂、シルト若しくは礫を含む土、砕石、再生砕石、ガラス砂又はスラグ等である。 Next, the fluidizing agent will be described. The fluidizing agent contains a thickener and a solvent. The fluidizing agent is mixed with the particulate material M to become a fluidized filler. The solvent dissolves the thickener and is, for example, water or an organic solvent. The granular material M is a known material used in the conventional ground improvement method, and is, for example, soil containing sand, silt or gravel, crushed stone, recycled crushed stone, glass sand or slag.
増粘剤は、溶媒に溶かした状態で所望の粘度を得られ、かつ、地盤Ｇ中で分解されて粘度が低下するものであれば良い。増粘剤に中性水溶性高分子を用いることにより、増粘剤は地盤Ｇ中で金属イオンと反応して金属錯体を生成する。これにより、増粘剤は分解される。 Any thickener may be used as long as it can obtain a desired viscosity in a state dissolved in a solvent and can be decomposed in the ground G to lower the viscosity. By using a neutral water-soluble polymer as the thickener, the thickener reacts with metal ions in the ground G to form a metal complex. Thereby, the thickener is decomposed.
増粘剤として用いられる中性水溶性高分子としては、例えば、ポリエチレンオキサイド（明星化学工業株式会社製、商品名：アルコックス）が考えられるが、これらに限定されるものではない。なお、ポリエチレンオキサイドは、ポリエチレンオキサイドより低分子量のポリエチレングレコールと比較すると、良好な粘性、曳糸性及びすべり性を示す。ポリエチレンオキサイドの粘性、曳糸性、すべり性により、流動化充填材がロッド４ａ内をスムーズに圧送される。 As a neutral water-soluble polymer used as a thickener, for example, polyethylene oxide (manufactured by Meisei Chemical Industry Co., Ltd., trade name: Alcox) is considered, but is not limited thereto. Polyethylene oxide exhibits better viscosity, spinnability and slipperiness than polyethylene oxide having a lower molecular weight than polyethylene oxide. Due to the viscosity, spinnability, and slipperiness of the polyethylene oxide, the fluidized filler is smoothly pumped through the rod 4a.
増粘剤としてポリエチレンオキサイドを採用した場合には、流動化充填材におけるポリエチレンオキサイドが地盤Ｇ中の金属イオンと結合して、金属錯体を生成することにより、ポリエチレンオキサイドが分解される。具体的には、金属錯体を形成したポリエチレンオキサイドは、分子サイズが変化することなく溶剤との親和性が低下することにより、流動化充填材中の溶剤が吐き出されるため、粘性、曳糸性及びすべり性が低下し、流動化充填材が塑性化する。最終的には、砂等の無害な粒状材料Ｍだけが地盤Ｇ内に残る。 When polyethylene oxide is employed as the thickener, the polyethylene oxide in the fluidized filler is combined with the metal ions in the ground G to form a metal complex, whereby the polyethylene oxide is decomposed. Specifically, the polyethylene oxide formed with the metal complex has a reduced viscosity with respect to the fluidized filler because the affinity with the solvent is reduced without changing the molecular size. The slipping property is lowered and the fluidized filler is plasticized. Eventually, only harmless granular material M such as sand remains in the ground G.
図２は、ポリエチレンオキサイドの平均分子量とポリエチレンオキサイドを水に溶解させて得られた流動化剤の粘度との関係を示すものである。なお、流動化物の粘度は、ＪＩＳＺ８８０３に準拠して、Ｂ型粘度計を用いて測定されたものである。なお、図２中の枠で囲まれた数字は、流動化剤の濃度を示し、図２中の線分は、流動化剤の各濃度における近似式を示す。なお、ここで「平均分子量」とは、数平均分子量をいう。 FIG. 2 shows the relationship between the average molecular weight of polyethylene oxide and the viscosity of a fluidizing agent obtained by dissolving polyethylene oxide in water. The viscosity of the fluidized product was measured using a B-type viscometer in accordance with JISZ8803. In addition, the number enclosed with the frame in FIG. 2 shows the density | concentration of a fluidizer, and the line segment in FIG. 2 shows the approximate expression in each density | concentration of a fluidizer. Here, “average molecular weight” refers to the number average molecular weight.
図２に示すように、同一濃度においては、増粘剤の平均分子量の増加に伴って、粘度も増加する。即ち、平均分子量が高い増粘剤は、低濃度でも所望の粘度を得られる。圧送ポンプ３の吐出圧、ロッド４ａの管路摩擦等を考慮すると、流動化剤の粘度は、１００〜５００００ｍＰａ・ｓに設定される。なお、流動化剤の粘度は、１００〜４００ｍＰａ・ｓに設定されるのが好ましい。さらに好ましくは、流動化剤の粘度は、２００〜３００ｍＰａ・ｓに設定される。これにより、流動化充填材の圧送に適した粘度が確保されるため、流動化充填材がロッド４ａ内で目詰まりすることを抑制すると共に、流動化充填材が地盤Ｇ内へ効率的に圧送される。 As shown in FIG. 2, at the same concentration, the viscosity increases as the average molecular weight of the thickener increases. That is, a thickener having a high average molecular weight can obtain a desired viscosity even at a low concentration. Considering the discharge pressure of the pressure pump 3, the pipe line friction of the rod 4a, etc., the viscosity of the fluidizing agent is set to 100 to 50000 mPa · s. The viscosity of the fluidizing agent is preferably set to 100 to 400 mPa · s. More preferably, the viscosity of the fluidizing agent is set to 200 to 300 mPa · s. As a result, a viscosity suitable for pumping the fluidized filler is secured, so that the fluidized filler is prevented from clogging in the rod 4a, and the fluidized filler is pumped efficiently into the ground G. Is done.
増粘剤の平均分子量は、５万以上に設定される。増粘剤の平均分子量は、３０万以上であるのが好ましい。さらに好ましくは、増粘剤の平均分子量は、２００万以上である。これにより、低濃度のポリエチレンオキサイドでも所望の粘度を確保できるため、低コストで流動化剤を得られる。 The average molecular weight of the thickener is set to 50,000 or more. The average molecular weight of the thickener is preferably 300,000 or more. More preferably, the average molecular weight of the thickener is 2 million or more. Thereby, since a desired viscosity can be secured even with a low concentration of polyethylene oxide, a fluidizing agent can be obtained at a low cost.
上述したように、本発明に係る地盤改良工法に用いられる流動化剤は、粘度１００〜５０００ｍＰａ・ｓに設定されることにより、流動化物を圧送する際に、ロッド４ａ内での目詰まりを抑制可能な流動性を確保することができる。また、増粘剤が地盤Ｇ中で分解されて流動化剤の粘性が低下することにより、流動化充填材が地盤Ｇ中で塑性化するため、施工後に工事等で地盤Ｇを掘り起こしたり掘削する場合であっても、流動化充填材が障害となり工事等を妨げることを回避することができる。 As described above, the fluidizing agent used in the ground improvement method according to the present invention suppresses clogging in the rod 4a when the fluidized material is pumped by setting the viscosity to 100 to 5000 mPa · s. Possible fluidity can be ensured. Moreover, since the thickener is decomposed in the ground G and the viscosity of the fluidizing agent is lowered, the fluidized filler is plasticized in the ground G. Therefore, the ground G is excavated or excavated by construction after construction. Even in this case, it can be avoided that the fluidized filler becomes an obstacle and hinders the construction work.
なお、本発明は、本発明の精神を逸脱しない限り種々の改変をなることができ、そして、本発明が該改変されたものにも及ぶことは当然である。 It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.
１ ・・・ 地盤改良装置
２ ・・・ ミキシングプラント
３ ・・・ 圧送ポンプ
４ ・・・ ボーリングマシン
４ａ・・・ ロッド
DESCRIPTION OF SYMBOLS 1 ... Ground improvement apparatus 2 ... Mixing plant 3 ... Pumping pump 4 ... Boring machine 4a ... Rod
Claims (5)
前記増粘剤は、中性水溶性高分子であり、
前記注入剤は、前記地盤への注入前にＪＩＳＺ８８０３に準拠して測定された粘度が１００〜５０００ｍＰａ・ｓに設定され、前記地盤への注入後に地盤内で前記増粘剤と金属イオンとが結合して金属錯体を生成し、前記増粘剤の分子サイズが一定のまま前記溶剤に対する前記増粘剤の親和性が低下し前記増粘剤が分解されて前記粘度が低下して、前記流動化充填材を塑性化させることを特徴とする地盤改良工法に用いられる注入剤。 A ground improvement method that contains a thickener and a solvent that dissolves the thickener, and is mixed with a granular material to form a fluidized filler, and the ground is compacted with the fluidized filler to increase the density. In the infusate used,
The thickener is a neutral water-soluble polymer,
The injection agent has a viscosity measured according to JISZ8803 before injection into the ground, set to 100 to 5000 mPa · s, and after the injection into the ground, the thickener and metal ions are combined in the ground. To form a metal complex, the affinity of the thickener to the solvent is reduced while the molecular size of the thickener is constant, the thickener is decomposed and the viscosity is reduced, and the fluidization An injecting agent used in a ground improvement method characterized by plasticizing a filler.
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