JP4086832B2 - Packer and packing method - Google Patents

Packer and packing method Download PDF

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JP4086832B2
JP4086832B2 JP2004304204A JP2004304204A JP4086832B2 JP 4086832 B2 JP4086832 B2 JP 4086832B2 JP 2004304204 A JP2004304204 A JP 2004304204A JP 2004304204 A JP2004304204 A JP 2004304204A JP 4086832 B2 JP4086832 B2 JP 4086832B2
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water
packer
bag body
absorbing polymer
cement
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JP2006118130A (en
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昭彦 平田
正二 鮎澤
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Nichiyu Giken Kogyo Co Ltd
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本発明は、例えば地盤補強工等で穿設されるボアホールに設けられ、ボアホール内の水や薬液等を止水するパッカー及びパッキング方法に関する。   The present invention relates to a packer and a packing method that are provided in a bore hole drilled by, for example, a ground reinforcement work, and stop water or chemicals in the bore hole.

ボアホールをパッキングする方法として、（１）ゴム製の袋体をボアホール内に設け、その袋体内部に水、オイル、エア等を加圧注入することにより膨張させて遮水する方法、（２）袋体のパッカーをボアホール内に設け、内部に経時硬化性の固結材を加圧注入することにより膨張させて遮水する方法が知られているが、（１）は液圧の解放に伴って遮水状態でなくなるため、継続的な遮水のためには液圧をかけ続けなければならない、（２）は注入材が硬化して遮水機能を発揮するまで、長時間待たなければならないという不具合がある。   As a method of packing the borehole, (1) a method of providing a rubber bag body in the borehole and inflating the bag body by pressurizing water, oil, air, etc., and blocking the water, (2) A method is known in which a packer for a bag body is provided in a borehole, and a curable caking material is infused into the borehole to inflate and insulate it, but (1) is accompanied by the release of hydraulic pressure. Therefore, it is necessary to continue to apply hydraulic pressure for continuous water blocking. (2) has to wait for a long time until the injection material hardens and exhibits water blocking function. There is a problem that.

そして、係る不具合を解消可能な方法として、（３）吸水性ポリマーをボアホール内に設け、吸水性ポリマーを吸水膨張させて遮水する方法があり、前記方法は、設置後に比較的短時間で遮水機能を発揮し、且つ比較的長期に亘って遮水機能を維持することが可能である。（３）の方法として、特許文献１には、筒状部材のパッキング箇所を吸水性ポリマーで取り囲み、その外側にゴムチューブを被せ、ゴムチューブ内の吸水性ポリマーをゴムチューブ内に同梱した水又は外部から供給する水で吸水膨張させて遮水する方法が開示されている。   As a method for solving such a problem, there is (3) a method in which a water-absorbing polymer is provided in the borehole, and the water-absorbing polymer is absorbed and expanded to absorb water. It is possible to exert a water function and maintain a water shielding function for a relatively long time. As a method of (3), Patent Document 1 discloses a method in which a packing portion of a cylindrical member is surrounded by a water-absorbing polymer, a rubber tube is covered on the outside, and the water-absorbing polymer in the rubber tube is enclosed in the rubber tube. Alternatively, a method is disclosed in which water is absorbed and expanded by water supplied from outside to block water.

特開平９−１５１６８６号公報JP-A-9-151686

しかしながら、（３）の方法は、吸水性ポリマーの膨張速度が速いものにあっては耐圧力が小さく、耐圧力が大きいものでは膨張速度が遅いためにパッキングまでに時間がかかるという問題がある。更に、長期に亘っては徐々に吸水性ポリマーが水を放出するため、止水機能を維持できないという問題がある。   However, the method of (3) has a problem that the pressure resistance is low when the water-absorbing polymer has a high expansion rate, and that when the pressure-resistance is high, the expansion rate is low, so that it takes time to pack. Furthermore, since a water absorbing polymer discharge | releases water gradually over a long period of time, there exists a problem that a water stop function cannot be maintained.

本発明は上記問題の解消を図るために提案するものであって、極めて短時間でパッキングすることができ、且つ耐圧力の大きいパッキング構造を得ることが可能であると共に、非常に長期間に亘って止水機能を維持することができるパッカー及びパッキング方法を提供することを目的とする。   The present invention is proposed in order to solve the above-mentioned problems, and it is possible to obtain a packing structure that can be packed in a very short time and has a large pressure resistance, and can be used for a very long time. It is an object of the present invention to provide a packer and a packing method that can maintain a water stop function.

本発明のパッカーは、杆体の周囲に設けられるパッカーであって、パッキングすべき領域に設置される膨張可能な袋体に、吸水性ポリマーの粉末とセメントの粉末とが充填されていることを特徴とする。前記パッカーは、その袋体を透水性として、例えば袋体内部に浸透する湧水等で吸水性ポリマーを膨潤するもの、又は、その袋体を防水性とし、袋体内部に水を供給可能な注入パイプ或いは破断する水収納パック等の水供給手段を設け、水供給手段で供給する水で吸水性ポリマーを膨潤するものとすると好適である。 The packer of the present invention is a packer provided around a casing, and is characterized in that an inflatable bag installed in an area to be packed is filled with a water-absorbing polymer powder and a cement powder. And The packer has water permeability in the bag body, for example, a water-swelling polymer that swells with spring water that permeates into the bag body, or the bag body is waterproof and can supply water to the bag body. It is preferable to provide water supply means such as an injection pipe or a ruptured water storage pack and swell the water-absorbing polymer with water supplied by the water supply means.

更に、本発明のパッカーは、前記吸水性ポリマーの粉末とセメントの粉末とが、重量比９：１〜１：９の混合比率で充填されていることを特徴とする。   Furthermore, the packer of the present invention is characterized in that the water-absorbing polymer powder and the cement powder are filled in a mixing ratio of 9: 1 to 1: 9 by weight.

また、本発明のパッキング方法は、膨張可能な袋体に吸水性ポリマーの粉末とセメントの粉末とが充填されているパッカーを杆体の周囲に設け、該パッカーがパッキングすべき領域に設置されるように杆体及びパッカーをボアホールに挿入し、袋体内部への水の浸入で吸水性ポリマーを膨潤することにより袋体を膨らましてパッキングすることを特徴とする。前記杆体は、例えば中空ボルト、ボルト、各種補強管、注入管等、或いはこれらの組み合わせなど適宜である。   In the packing method of the present invention, a packer in which an inflatable bag is filled with a water-absorbing polymer powder and a cement powder is provided around the casing, and the packer is installed in an area to be packed. In addition, the bag body and the packer are inserted into the borehole, and the bag body is inflated and packed by swelling the water-absorbing polymer by intrusion of water into the bag body. The casing is appropriate, for example, a hollow bolt, a bolt, various reinforcing pipes, an injection pipe, or a combination thereof.

本発明のパッカー及びパッキング方法では、袋体内の吸水性ポリマーが吸水膨張して、セメント密度を高めつつ袋体を膨張することにより、数秒以内など極めて短時間にパッキングすることができる。また、袋体内に供給した水或いは浸透した水でセメントの硬化が開始し、その後に袋体内部で吸水性ポリマーが手放した水と徐々に反応してセメントの強度が高まっていくので、耐圧力の大きいパッキング構造を得ることが可能であると共に、非常に長期間に亘って止水機能を維持することができる。   In the packer and packing method of the present invention, the water absorbent polymer in the bag body absorbs and expands, and the bag body is expanded while increasing the cement density. Also, hardening of the cement starts with the water supplied or penetrated into the bag, and then gradually reacts with the water released by the water-absorbing polymer inside the bag, increasing the strength of the cement. It is possible to obtain a large packing structure and to maintain the water stop function for a very long time.

また、吸水性ポリマーとセメントも粉体であるため、膨張前の状態ではパッカーの柔軟性が高いことから、ボルトなど杆体の周囲に容易に設けることができる。更に、パッカーの柔軟性と吸水性ポリマーの高い膨張性により、ボアホールに孔壁に若干の凹凸がある場合にも、確実に止水部分を閉塞することができる。   Further, since the water-absorbing polymer and the cement are also powders, the packer is highly flexible before being expanded, so that it can be easily provided around the casing such as a bolt. Further, due to the flexibility of the packer and the high expansibility of the water-absorbing polymer, the water-stopping portion can be reliably closed even when the borehole has a slight irregularity on the hole wall.

また、吸水性ポリマーは高価であるが、セメントと混合することで吸水性ポリマーの使用量を削減することができ、コスト低減を図ることができる。   Further, although the water-absorbing polymer is expensive, the amount of the water-absorbing polymer used can be reduced by mixing with cement, thereby reducing the cost.

以下では、本発明について図に示す実施形態に基づき説明する。尚、各実施形態やその施工例の構成は、適用可能な範囲で適宜他の実施形態について適用可能である。   Below, this invention is demonstrated based on embodiment shown to a figure. In addition, the structure of each embodiment and its construction example is applicable about other embodiment suitably in the applicable range.

第１実施形態のパッカー１は、図１に示すように、防水性の布を縫製したドーナツ状の袋体２を有する。袋体２には、その中央に中空ボルト６等の杆体を挿通させる挿通穴４が設けられ、挿通穴４の外周である内周面２ａが中空ボルト６等の杆体に対応した内径になっていると共に、膨張時に於ける外表面２ｂの径方向突出部分の外径が、ボアホール・鋼管等の止水する領域を閉塞可能な径になっている。   The packer 1 of 1st Embodiment has the donut-shaped bag body 2 which sewn the waterproof cloth as shown in FIG. The bag body 2 is provided with an insertion hole 4 through which a housing such as a hollow bolt 6 is inserted in the center thereof, and an inner peripheral surface 2a which is an outer periphery of the insertion hole 4 has an inner diameter corresponding to the housing such as the hollow bolt 6. In addition, the outer diameter of the radially projecting portion of the outer surface 2b during expansion is a diameter that can block a water-stopping region such as a borehole or a steel pipe.

袋体２の内周面２ａと外表面２ｂとの間の内部には、吸水性ポリマーの粉末とセメントの粉末との混合物３が充填されている。前記吸水性ポリマーの種類やセメントの種類は適宜であるが、吸水性ポリマーにはポリアクリル酸ナトリウム等に代表されるものを用いる。本実施例では、吸水性ポリマーとして高吸水性樹脂のサンダイヤ株式会社製「アクアパール」を用い、セメントとして急硬セメントなどの急結性のあるセメントを用い、吸水性ポリマーとセメントとの混合比率（重量比）を１：４としているが、必要に応じてこれらにセメントの添加剤、例えば膨張材、減水剤、急結剤、及び硅紗等を混和することも有効である。   The interior of the bag body 2 between the inner peripheral surface 2a and the outer surface 2b is filled with a mixture 3 of a water-absorbing polymer powder and a cement powder. The kind of the water-absorbing polymer and the kind of the cement are appropriate, and the water-absorbing polymer represented by sodium polyacrylate or the like is used. In this example, "Aqua Pearl" manufactured by Sundia Co., Ltd., which is a highly water-absorbing resin, is used as the water-absorbing polymer, and a cement with rapid setting properties such as quick-hardening cement is used as the cement. The (weight ratio) is 1: 4, but it is also effective to add cement additives such as an expanding agent, a water reducing agent, a quick setting agent, and soot to these as necessary.

尚、吸水性ポリマーとセメントとの混合比率（重量比）の最も好ましい範囲は、１：１〜１：６であるが、有効と考えられるのは９：１〜１：９、使用可能と考えられるのは、９９：１〜１：９９の範囲である。   The most preferable range of the mixing ratio (weight ratio) between the water-absorbing polymer and the cement is 1: 1 to 1: 6, but it is considered that the effective ratio is 9: 1 to 1: 9, and it can be used. It is in the range of 99: 1 to 1:99.

更に、内周面２ａと外表面２ｂとの間の所定位置には挿通穴２ｃが形成され、袋体２の内部に水を供給するパッカー用注入管５が挿通穴２ｃに差し込んで設置されている。尚、袋体２の内部へ水を供給する水供給手段は、パッカー用注入管５以外にも、例えば後述する水収納パック１２など適宜である。   Further, an insertion hole 2c is formed at a predetermined position between the inner peripheral surface 2a and the outer surface 2b, and a packer injection pipe 5 for supplying water into the bag body 2 is inserted into the insertion hole 2c and installed. Yes. In addition, the water supply means for supplying water to the inside of the bag body 2 is appropriate, for example, a water storage pack 12 to be described later, in addition to the packer injection pipe 5.

上記第１実施形態のパッカー１と中空ボルト６を用いて地盤補強工を施す場合には、例えば図３（ａ）に示すように、吸水性ポリマーの粉末とセメントの粉末との混合物３が充填されたパッカー１の挿通穴４に中空ボルト６を挿通して、中空ボルト６の後端近傍の周囲にパッカー１を周設する。その後、地盤Ｇに斜め上方へ向かって穿設されたボアホールＨに中空ボルト６及びパッカー１を挿入して、ボアホールの口元近傍など止水すべき部分にパッカー１を配置し、パッカー用注入管５から袋体２の内部へ水を供給し、吸水性ポリマー３ａを吸水膨張させることにより袋体２を膨らましてパッキングする（図３（ｂ））。その後、中空ボルト６に固結材を注入して固結領域７を形成し、地盤補強が完了する（図３（ｃ））。   When the ground reinforcement work is performed using the packer 1 and the hollow bolt 6 of the first embodiment, a mixture 3 of a water-absorbing polymer powder and a cement powder is filled, for example, as shown in FIG. The hollow bolt 6 is inserted into the insertion hole 4 of the packer 1, and the packer 1 is provided around the vicinity of the rear end of the hollow bolt 6. After that, the hollow bolt 6 and the packer 1 are inserted into the bore hole H drilled obliquely upward in the ground G, and the packer 1 is arranged in a portion to be water-stopped such as near the mouth of the bore hole. Then, water is supplied to the inside of the bag body 2 to absorb and expand the water-absorbing polymer 3a, thereby expanding and packing the bag body 2 (FIG. 3B). Thereafter, a caking material is injected into the hollow bolt 6 to form a caulking region 7, and the ground reinforcement is completed (FIG. 3C).

上記パッカー１は、第１段階として、図１（ａ）、図２（ａ）の袋体２の膨張前の状態から、パッカー用注入管５を介して袋体２の内部に水を供給すると、吸水性ポリマー３ａが吸水膨張して、その周囲のセメント３ｂの密度を高めつつ袋体２がパッキングすべき領域の形状に沿って膨張し、図１（ｂ）、図２（ｂ）の膨張後の状態となる。前記袋体２の膨張によるパッキング機能は数秒以内など極めて短時間に得られる。そして、供給される水でセメントが硬化を開始し、袋体２の内部で吸水性ポリマー３ａが徐々に手放した水と反応してセメントの硬化が進行し、強度が高いパッキング構造が得られる。   When the packer 1 supplies water to the inside of the bag body 2 through the packer injection pipe 5 from the state before the expansion of the bag body 2 in FIGS. 1 (a) and 2 (a), as the first stage. The water-absorbing polymer 3a absorbs and expands to increase the density of the surrounding cement 3b, and the bag 2 expands along the shape of the region to be packed, and the expansion shown in FIGS. 1B and 2B. It will be in a later state. The packing function by the expansion of the bag body 2 can be obtained in a very short time such as within several seconds. Then, the cement starts to harden with the supplied water, and the water-absorbing polymer 3a gradually reacts with the water released inside the bag body 2 to harden the cement, thereby obtaining a packing structure with high strength.

また、上記施工例以外にもパッカー１の施工方法は適宜であり、例えば別の施工例として、地盤Ｇの壁面から地中に穿設されたボアホールＨに、パッカー用注入管５を有するパッカー１が周設された中空ボルト６を挿設し、止水部分にパッカー１を配置する構成（図４（ａ））、或いは、パッカー１に杆体として中空ボルト６及びエア抜きパイプ８を挿入して取り付け、ボアホールＨに、パッカー１が周設された中空ボルト６及びエア抜きパイプ８を挿設し、止水部分にパッカー１を配置する構成（図４（ｂ））、或いは、パッカー１に杆体としてボルト９及び注入パイプ１０を挿入して取り付け、ボアホールＨに、パッカー１が周設されたボルト９及び注入パイプ１０を挿設し、止水部分にパッカー１を配置する構成（図４（ｃ））、或いは、パッカー１に杆体としてボルト９、注入パイプ１０、エア抜きパイプ８を挿入して取り付け、ボアホールＨに、パッカー１が周設されたボルト９、注入パイプ１０、エア抜きパイプ８を挿設し、止水部分にパッカー１を配置する構成（図４（ｄ））、或いは、ボアホールＨに、鋼管や穴開き管等の補強管１１を打設し、補強管１１内にパッカー１が周設された中空ボルト６を挿設し、補強管１１内の止水部分にパッカー１を配置する構成（図４（ｅ））等とすることが可能である。尚、パッカー１は地盤補強以外の、地盤の調査・測定や地盤への薬液注入等でボアホールを設ける場合にも適用することができる。   In addition to the above construction examples, the construction method of the packer 1 is appropriate. For example, as another construction example, the packer 1 having the packer injection pipe 5 in the bore hole H drilled from the wall surface of the ground G into the ground. The hollow bolt 6 having a circumferential shape is inserted and the packer 1 is arranged in the water stop portion (FIG. 4A), or the hollow bolt 6 and the air vent pipe 8 are inserted into the packer 1 as a casing. A structure in which the hollow bolt 6 and the air vent pipe 8 around which the packer 1 is installed are inserted into the bore hole H and the packer 1 is disposed in the water stop portion (FIG. 4B), or the housing of the packer 1 As shown in FIG. 4 (c), the bolt 9 and the injection pipe 10 are inserted and attached, the bolt 9 and the injection pipe 10 around which the packer 1 is provided are inserted into the bore hole H, and the packer 1 is disposed in the water stop portion. )) Or The bolt 9, the injection pipe 10, and the air vent pipe 8 are inserted and attached to the packer 1 as the housing, and the bolt 9, the injection pipe 10 and the air vent pipe 8 around which the packer 1 is provided are inserted into the bore hole H. A configuration in which the packer 1 is disposed in the water stop portion (FIG. 4D), or a reinforcing pipe 11 such as a steel pipe or a perforated pipe is placed in the bore hole H, and the packer 1 is provided around the reinforcing pipe 11. It is possible to adopt a configuration (FIG. 4E) or the like in which the hollow bolt 6 is inserted and the packer 1 is disposed in the water stop portion in the reinforcing tube 11. The packer 1 can also be applied to a case where a borehole is provided other than ground reinforcement, such as ground investigation / measurement or injection of a chemical into the ground.

次に、他の実施形態のパッカー１について説明する。   Next, the packer 1 of other embodiment is demonstrated.

第２実施形態のパッカー１は、図５に示すように、第１実施形態と同様に内周面２ａと外表面２ｂとで構成されるドーナツ状の袋体２を有するが、袋体２は透水性の生地で形成されている。袋体２の内部には、吸水性ポリマーの粉末とセメントの粉末との混合物３が充填されている。また、第１実施形態と異なり、袋体２には、パッカー用注入管５を挿通する挿通穴２ｃは設けられておらず、袋体２の内周面２ａと外表面２ｂとは完全に密閉されている。そして、第２実施形態のパッカー１は、図５（ａ）の袋体２の膨張前の状態から、例えばボアホールＨ内の湧水など周囲の水が透水性の袋体２の内部へ浸透し、吸水性ポリマー３ａが吸水膨張して、その周囲のセメント３ｂの密度を高めつつ袋体２が膨張し（図３参照）、図５（ｂ）の膨張後の状態となる。尚、防水性の袋体２のパッカー１と透水性の袋体２のパッカー１とを現場状況に応じて適宜使い分けると好適である。   As shown in FIG. 5, the packer 1 of the second embodiment has a donut-shaped bag body 2 composed of an inner peripheral surface 2 a and an outer surface 2 b as in the first embodiment. It is made of water-permeable fabric. The inside of the bag body 2 is filled with a mixture 3 of water-absorbing polymer powder and cement powder. Further, unlike the first embodiment, the bag body 2 is not provided with the insertion hole 2c through which the packer injection tube 5 is inserted, and the inner peripheral surface 2a and the outer surface 2b of the bag body 2 are completely sealed. Has been. Then, the packer 1 of the second embodiment allows the surrounding water such as spring water in the borehole H to penetrate into the inside of the water-permeable bag body 2 from the state before the bag body 2 in FIG. Then, the water-absorbing polymer 3a absorbs and expands, and the bag body 2 expands while increasing the density of the surrounding cement 3b (see FIG. 3), resulting in the state after expansion in FIG. 5B. In addition, it is preferable that the packer 1 of the waterproof bag body 2 and the packer 1 of the water-permeable bag body 2 are properly used according to the field situation.

また、別例として、第３実施形態のパッカー１は、図６に示すように、内周面２ａと外表面２ｂとで構成されるドーナツ状で、防水性の生地で完全密閉して形成されている袋体２を有し、袋体２の内部に、破断紐１３を引っ張ると破断する水収納パック１２を配設すると共に、吸水性ポリマーの粉末とセメントの粉末との混合物を充填する構成である。前記パッカー１を使用する際には、ボアホールＨにセットした後に破断紐１３を引っ張って水収納パック１２を破断し、水収納パック１２内の水を混合物に浸透させて吸水性ポリマーを膨張させる。尚、水収納パック１２を破断させる手段は適宜であり、ボアホールＨの外側から鋭利な鋼棒等で突き破っても良い。   As another example, as shown in FIG. 6, the packer 1 of the third embodiment has a donut shape composed of an inner peripheral surface 2a and an outer surface 2b, and is completely sealed with a waterproof fabric. And a water storage pack 12 that is broken when the broken string 13 is pulled, and is filled with a mixture of water-absorbing polymer powder and cement powder. It is. When the packer 1 is used, after setting it in the bore hole H, the breaking string 13 is pulled to break the water storage pack 12, and the water in the water storage pack 12 is permeated into the mixture to expand the water-absorbing polymer. The means for breaking the water storage pack 12 is appropriate, and the water storage pack 12 may be broken from the outside of the bore hole H with a sharp steel rod or the like.

また、別例として、第４実施形態のパッカー１は、図７に示すように、平らな枕形状の袋体２を有し、その袋体２の内部に吸水性ポリマーの粉末とセメントの粉末の混合物３が充填されたものであって、平らな枕状のパッカー１を中空ボルト６等の杆体の所定位置に、予め或いは施工現場で巻き付けて設置する。前記袋体２の内部の混合物３への水の供給は、袋体２を透水性として湧水等の浸透で供給する他、防水性の袋体２の内部へパッカー用注入管を介して水を供給する構成としてもよい。   As another example, as shown in FIG. 7, the packer 1 of the fourth embodiment has a flat pillow-shaped bag body 2, and a water-absorbing polymer powder and a cement powder in the bag body 2. The flat pillow-like packer 1 is wound around a predetermined position of a housing such as a hollow bolt 6 or is wound around a construction site in advance. Water is supplied to the mixture 3 inside the bag body 2 by making the bag body 2 permeable and supplying water by permeation of spring water or the like, and water is supplied to the inside of the waterproof bag body 2 through a packer injection pipe. It is good also as a structure which supplies.

次に、第１実施形態のパッカー１で行った耐圧実験例について説明する。   Next, an example of a pressure resistance experiment performed by the packer 1 of the first embodiment will be described.

耐圧実験では、内径φ５３ｍｍの鋼管を模擬ボアホールとした加圧ケース１４の口元近傍部分に、吸水性ポリマーとセメントの混合物が充填されたパッカー１を配置すると共に、パッカー１の中央部の挿通穴４に導水管１５を挿設する。更に、パッカー用注入管５を介して水を供給し、吸水性ポリマーを膨張させることでパッカー１を膨張させ、加圧ケース１４の口元近傍部分を閉塞する。そして、膨張直後の状態で、コンプレッサ１６で圧力をかけて導水管１５から加圧ケース１４内に水を供給した結果、パッカー１は水圧１０ｋｇ／ｃｍ２に耐えることができた。従って、例えば地盤のボアホール内にパッカーをセットした直後に、パッカー１の杆体を介して注入材を注入する場合にも、１０ｋｇ／ｃｍ２迄の注入圧力に耐えることが可能である。 In the pressure resistance experiment, the packer 1 filled with a mixture of a water-absorbing polymer and cement is disposed in the vicinity of the mouth of the pressurizing case 14 using a steel pipe having an inner diameter of 53 mm as a simulated borehole, and the insertion hole 4 in the center of the packer 1 is disposed. A water conduit 15 is inserted into the pipe. Further, water is supplied through the packer injection pipe 5 to expand the water-absorbing polymer, so that the packer 1 is expanded and the vicinity of the mouth of the pressure case 14 is closed. As a result of supplying water from the water conduit 15 into the pressure case 14 with pressure applied by the compressor 16 in a state immediately after expansion, the packer 1 was able to withstand a water pressure of 10 kg / cm 2 . Therefore, for example, immediately after the packer is set in the borehole of the ground, it is possible to withstand an injection pressure of up to 10 kg / cm 2 even when the injection material is injected through the housing of the packer 1.

本発明は、例えばボアホールの穿設を伴うロックボルトやアンカーを設置する補強工、或いは先受工、鏡補強工、薬液注入工等を行う場合や、ボアホールを介して地盤の調査・測定を行う場合や、地盤にボアホールを穿設して薬液注入を行う場合等に、ボアホール内の水や薬液等を止水するために利用可能である。   In the present invention, for example, in the case of performing a reinforcing work for installing a lock bolt or an anchor accompanied with drilling of a bore hole, a receiving work, a mirror reinforcing work, a chemical solution injecting work, etc., or conducting investigation / measurement of the ground through the bore hole In this case, or when a hole is drilled in the ground to inject a chemical solution, it can be used to stop water, a chemical solution, or the like in the borehole.

（ａ）は第１実施形態のパッカーの膨張前の状態を示す斜視図、（ｂ）は同図（ａ）のパッカーの膨張後の状態を示す斜視図。(A) is a perspective view which shows the state before expansion | swelling of the packer of 1st Embodiment, (b) is a perspective view which shows the state after expansion | swelling of the packer of the same figure (a). （ａ）は混合された吸水性ポリマーとセメントの膨張前の状態を示す説明図、（ｂ）は同図（ａ）の膨張後の状態を示す説明図。(A) is explanatory drawing which shows the state before expansion | swelling of the mixed water absorbing polymer and cement, (b) is explanatory drawing which shows the state after expansion | swelling of the same figure (a). （ａ）〜（ｃ）は第１実施形態のパッカーによる施工例の工程説明図。(A)-(c) is process explanatory drawing of the construction example by the packer of 1st Embodiment. （ａ）〜（ｅ）は第１実施形態のパッカーによる他の施工例の説明図。(A)-(e) is explanatory drawing of the other construction example by the packer of 1st Embodiment. （ａ）は第２実施形態のパッカーの膨張前の状態を示す斜視図、（ｂ）は同図（ａ）のパッカーの膨張後の状態を示す斜視図。(A) is a perspective view which shows the state before expansion | swelling of the packer of 2nd Embodiment, (b) is a perspective view which shows the state after expansion | swelling of the packer of the same figure (a). 第３実施形態のパッカーを示す斜視図。The perspective view which shows the packer of 3rd Embodiment. 第４実施形態のパッカーを示す斜視図。The perspective view which shows the packer of 4th Embodiment. パッカーの耐圧実験を説明する説明図。Explanatory drawing explaining the pressure | voltage resistant experiment of a packer.

符号の説明Explanation of symbols

１ パッカー
２ 袋体
３ 吸水性ポリマーとセメントの混合物
３ａ 吸水性ポリマー
３ｂ セメント
５ パッカー用注入管
６ 中空ボルト
７ 固結領域
１２ 水収納パック
１３ 破断紐
Ｇ 地盤
Ｈ ボアホール
DESCRIPTION OF SYMBOLS 1 Packer 2 Bag body 3 Mixture of water-absorbing polymer and cement 3a Water-absorbing polymer 3b Cement 5 Injection tube 6 for packer Hollow bolt 7 Consolidation area 12 Water storage pack 13 Break string G Ground H Borehole

Claims (5)

杆体の周囲に設けられるパッカーであって、パッキングすべき領域に設置される膨張可能な袋体に、吸水性ポリマーの粉末とセメントの粉末とが充填されていることを特徴とするパッカー。 A packer provided around a casing, wherein an inflatable bag body installed in an area to be packed is filled with a water-absorbing polymer powder and a cement powder. 前記袋体が透水性であることを特徴とする請求項１記載のパッカー。 The packer according to claim 1, wherein the bag body is water permeable. 前記袋体が防水性であり、前記袋体内部へ水を供給する水供給手段が設けられていることを特徴とする請求項１記載のパッカー。 The packer according to claim 1, wherein the bag body is waterproof and provided with water supply means for supplying water into the bag body. 前記吸水性ポリマーの粉末とセメントの粉末とが、重量比９：１〜１：９の混合比率で充填されていることを特徴とする請求項１、２又は３記載のパッカー。 The packer according to claim 1, 2 or 3, wherein the water-absorbing polymer powder and the cement powder are filled at a mixing ratio of 9: 1 to 1: 9 by weight. 膨張可能な袋体に吸水性ポリマーの粉末とセメントの粉末とが充填されているパッカーを杆体の周囲に設け、該パッカーがパッキングすべき領域に設置されるように杆体及びパッカーをボアホールに挿入し、袋体内部への水の浸入で吸水性ポリマーを膨潤することにより袋体を膨らましてパッキングすることを特徴とするパッキング方法。 A packer filled with water-absorbing polymer powder and cement powder in an inflatable bag is provided around the casing, and the casing and packer are inserted into the borehole so that the packer is placed in the area to be packed. A packing method comprising inflating and packing a bag by swelling a water-absorbing polymer by intrusion of water into the bag.
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