JP5731928B2 - Injection stiffening member for maintenance repair of mortar spray - Google Patents

Injection stiffening member for maintenance repair of mortar spray Download PDF

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JP5731928B2
JP5731928B2 JP2011172911A JP2011172911A JP5731928B2 JP 5731928 B2 JP5731928 B2 JP 5731928B2 JP 2011172911 A JP2011172911 A JP 2011172911A JP 2011172911 A JP2011172911 A JP 2011172911A JP 5731928 B2 JP5731928 B2 JP 5731928B2
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pressure plate
stiffening member
grout
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鈴木 誠
鈴木  誠
濱田 誠
誠 濱田
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岡部株式会社
東興ジオテック株式会社
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Description

本発明は、老朽化したモルタル吹付を維持補修する際に用いる注入補剛部材に関する。   The present invention relates to an injection stiffening member used when maintaining and repairing an aging mortar spray.

地山などの斜面が風雨などによって崩壊することを防ぐため、その表面にモルタルなどを吹き付けて補強しているが、近年、そのモルタル吹付が老朽化し、また、地山の土砂などの流出によって、モルタル吹付と地山との間に空洞が生じてしまうケースがある。そして、このような老朽化したモルタル吹付や地山に対して維持補修を施すことになるが、その方法としては、例えば、モルタル吹付及び地山に対して削孔を形成し、その削孔にアンカーを挿入すると共に、アンカーを介してグラウトを圧入することで削孔内や空洞にグラウトを充填する方法がある(例えば、特許文献1参照)。なお、その後に、ロックボルトの頭部をナット等の固定手段により固定し、老朽化したモルタル吹付の上から新たなモルタルを吹き付けることもある。   In order to prevent the slopes of natural ground from collapsing due to wind and rain, etc., mortar is sprayed on the surface to reinforce, but in recent years, the mortar spray has become obsolete, and due to runoff of earth and sand, etc. There is a case where a cavity is generated between the mortar spray and the natural ground. Then, maintenance repairs are performed on such aging mortar sprays and grounds. For example, a hole is formed in the mortar sprays and grounds. There is a method of filling a grout in a drilling hole or a cavity by inserting an anchor and press-fitting the grout through the anchor (see, for example, Patent Document 1). In addition, after that, the head of the lock bolt is fixed by a fixing means such as a nut, and new mortar may be sprayed from above the aging mortar spray.

特公平5−22775号公報Japanese Patent Publication No. 5-22775

しかし、このような従来の老朽化モルタル吹付の維持補修方法は、アンカーを介して削孔内にグラウトを圧入するため、その削孔内や空洞にグラウトを完全に充填させることは可能だが、削孔の内壁に細かいクラック(亀裂)が発生していた場合には、それらクラックの内部にまでグラウトを完全に充填させることは難しい。   However, in such a conventional repair method for aging mortar spraying, grout is press-fitted into the hole through the anchor, so that it is possible to completely fill the grout in the hole or cavity. When fine cracks (cracks) have occurred on the inner walls of the holes, it is difficult to completely fill the grout into the cracks.

そこで、本件出願人は、本願出願時点ではまだ未公開であるが、削孔内に注入したグラウト材を加圧するための加圧板を管状体の先端に設けた注入補剛部材を使用した「老朽化モルタル吹付面の維持補修工法に用いる補強構造体およびその工法」(特願2011−027620号、特許出願日平成23年2月10日)について出願している。この発明によれば、削孔内に圧入した(1次注入)グラウトに対して、注入補剛部材を削孔内に押し込むことでさらに圧力を加え、その加圧された状態でさらにグラウトを圧入する(2次注入)ことから、前述したクラックの内部にまで確実にグラウトを充填させることができる。   Therefore, although the present applicant has not yet disclosed at the time of filing the present application, the present applicant uses an injection stiffening member in which a pressure plate for pressing the grout material injected into the drilling hole is provided at the distal end of the tubular body. "Reinforcing structure used in maintenance repair method for chemical mortar sprayed surface and method thereof" (Japanese Patent Application No. 2011-027620, patent application date February 10, 2011). According to this invention, further pressure is applied to the grout press-fitted into the hole (primary injection) by pushing the injection stiffening member into the hole, and the grout is further pressed in the pressurized state. By performing (secondary injection), the grout can be reliably filled up to the inside of the crack described above.

しかし、この未公開出願に記載された注入補剛部材は、加圧板の外周縁と削孔内周面との間に大きな隙間隙が設けられ、その間隙からグラウトを排出するようにしているため、加圧板については、間隙がある分だけ面積が小さくなってしまい、グラウトを加圧する力が弱い。また、その加圧板の外周縁上には、注入補剛部材における削孔内への押し込み時の直進性を保つと共に、削孔の中心に位置させるためのゴム製の弾性スペーサーが円周方向に等角度の間隔で部分的に設ける例も開示されている。しかしながら、この注入補剛部材はロックボルトの補強機能や防錆効果も兼ね備えていることから、維持補修工事の終了後においても地山等から引き抜かれることはない。そのため、ゴム製の弾性スペーサーは削孔内に埋没された状態になり、構造上、異物として扱われる可能性がある。なお、加圧板の大きさについては、加圧効率等の面から言えば、削孔径とほぼ同じ外径にするのが最も良いが、その大きさにした場合には、前述したように、注入補剛部材を削孔内に押し込む際に、余分なグラウト材を外部に排出させることが困難になる。また、削孔の内壁から硬い岩の一部が突出するような状況もあり、注入補剛部材の押し込み作業に支障が生じる可能性があるとともに、無理に押し込んだ場合にはその岩によって加圧板が変形するおそれもある。この点については、加圧板が1枚の鋼板で形成されていることから、その変形が加圧板全体に及んでしまい、加圧効率の低下に繋がることも想定される。   However, the injection stiffening member described in this unpublished application is provided with a large gap between the outer peripheral edge of the pressure plate and the inner peripheral surface of the drilled hole, so that the grout is discharged from the gap. As for the pressure plate, the area becomes small as much as there is a gap, and the force to press the grout is weak. In addition, on the outer peripheral edge of the pressure plate, a rubber elastic spacer is provided in the circumferential direction in order to maintain straightness when the injection stiffening member is pushed into the hole and to be positioned at the center of the hole. An example in which parts are provided at equiangular intervals is also disclosed. However, since this injection stiffening member also has a lock bolt reinforcement function and a rust prevention effect, it is not pulled out from the ground or the like after the maintenance and repair work. Therefore, the elastic spacer made of rubber is buried in the drilling hole, and may be treated as a foreign substance due to the structure. As for the size of the pressure plate, in terms of pressure efficiency, etc., it is best to set the outer diameter to be approximately the same as the diameter of the drilling hole. When pushing the stiffening member into the hole, it becomes difficult to discharge the excess grout material to the outside. In addition, there is a situation where a part of hard rock protrudes from the inner wall of the drilling hole, and there is a possibility that the pushing operation of the injection stiffening member may be hindered. May be deformed. About this point, since the pressurization plate is formed with one steel plate, the deformation reaches the whole pressurization plate, and it is assumed that pressurization efficiency falls.

そこで、本発明は、このような問題に着目してなされたものであって、加圧力が大きく、また注入補剛部材の直進性にも優れると共に、削孔の中心に位置させるためのスペーサーの機能も兼ね備え、さらには、削孔の内壁から突出した岩に当たっても加圧板全体が変形せず、地山等から引き抜かなくても構造的に何の問題のないモルタル吹付の維持補修用注入補剛部材を提供することを目的とする。   Therefore, the present invention has been made paying attention to such a problem, and has a large applied pressure and excellent linearity of the injection stiffening member, and a spacer for positioning at the center of the drilling hole. In addition, the entire pressure plate will not be deformed even if it hits the rock protruding from the inner wall of the drilling hole, and there is no structural problem even if it is not pulled out from the ground. An object is to provide a member.

上記の目的を達成するために、請求項1の発明のモルタル吹付の維持補修用注入補剛部材は、鋼製からなる略円環状の加圧板を管状体の先端部に設け、モルタル吹付及び地山に形成した削孔の内部に挿入されたロックボルトを内挿した状態で該削孔内にグラウトを注入すると共に、削孔内に押し込むことでそのグラウトを加圧板により加圧するモルタル吹付の維持補修用注入補剛部材であって、該加圧板は、削孔の内径とほぼ同じ外径を有し、その外周部から管状体の外周面まで延びるスリットが円周方向に適宜間隔で複数形成されていると共に、その外周部とスリットとの交点にそれぞれ切欠部が形成されていることを特徴とする。これにより、加圧力が大きく、また注入補剛部材の直進性にも優れると共に、削孔の中心に位置させるためのスペーサーの機能も兼ね備え、さらには、削孔の内壁から突出した岩に当たっても加圧板全体が変形せず、地山等から引き抜かなくても構造上、問題のないものとなる。   In order to achieve the above object, an injection stiffening member for maintaining and repairing mortar spray according to the invention of claim 1 is provided with a substantially annular pressure plate made of steel at the tip of a tubular body, Maintaining mortar spraying in which grout is injected into the drilling hole with a lock bolt inserted into the drilling hole formed in the mountain and pressed into the drilling hole by pressing the grout with a pressure plate An injection stiffening member for repair, wherein the pressure plate has an outer diameter substantially the same as the inner diameter of the hole, and a plurality of slits extending from the outer peripheral portion to the outer peripheral surface of the tubular body are formed at appropriate intervals in the circumferential direction. And a notch is formed at the intersection between the outer periphery and the slit. As a result, the pressing force is large, the straightness of the injection stiffening member is excellent, it also functions as a spacer for positioning at the center of the drilling hole, and even when it hits rocks protruding from the inner wall of the drilling hole Even if the entire pressure plate is not deformed and is not pulled out from a natural ground or the like, there is no problem in structure.

加圧板は削孔の内径とほぼ同じ外径を有するので、最大限の加圧効率を発揮することができると共に、削孔の中心に沿って注入補剛管部材を真っ直ぐに挿入することができ、施工性が向上する。また、加圧板の外周部から管状体の外周面まで延びるスリットが円周方向に適宜間隔で複数形成されているので、従来の鋼製の加圧板よりも剛性が低くなり、挿入性が良くなる。また、削孔の内壁から突出する岩によって加圧板の一部分が変形したとしても、その変形の伝達がスリットによって遮断され、加圧板全体に及ばないので、加圧効率の低下を最小限に止めることができる。さらに、外周部とスリットとの交点にそれぞれ切欠部を形成しているので、削孔の内壁から突出する岩があっても回避することが容易であると共に、スリットと切欠部を介してグラウトを外部に確実に排出することができる。また、加圧板にゴム製の弾性スペーサーを設けることが不要になるため、削孔内に異物を埋没させることを防止できる。   The pressure plate has an outer diameter that is almost the same as the inner diameter of the hole, so that the maximum pressure efficiency can be achieved, and the injection stiffening tube member can be inserted straight along the center of the hole. The workability is improved. In addition, since a plurality of slits extending from the outer peripheral portion of the pressure plate to the outer peripheral surface of the tubular body are formed at appropriate intervals in the circumferential direction, the rigidity is lower than that of a conventional steel pressure plate and the insertability is improved. . Even if a part of the pressure plate is deformed by rocks protruding from the inner wall of the drilling hole, the transmission of the deformation is blocked by the slit and does not reach the entire pressure plate, so the reduction in pressure efficiency is minimized. Can do. Furthermore, since the notch is formed at the intersection of the outer periphery and the slit, it is easy to avoid even if there is a rock protruding from the inner wall of the drilling hole, and the grout is formed via the slit and the notch. It can be reliably discharged outside. Further, since it is not necessary to provide a rubber elastic spacer on the pressure plate, it is possible to prevent foreign matter from being buried in the hole.

注入補剛部材の実施形態を示す図である。It is a figure which shows embodiment of an injection | pouring stiffening member. この注入補剛部材を使用した維持補修工事の施工手順を示す図である。It is a figure which shows the construction procedure of the maintenance repair work which uses this injection stiffening member. 加圧板の変形例を示す図である。It is a figure which shows the modification of a pressurization board. 加圧板の他の変形例を示す図である。It is a figure which shows the other modification of a pressurization board. 管状体への加圧板の他の取付け例を示す図である。It is a figure which shows the other example of attachment of the pressurization board to a tubular body.

次に、本発明にかかる注入補剛部材の実施形態について説明する。   Next, an embodiment of the injection stiffening member according to the present invention will be described.

図1は、本発明の注入補剛部材1全体を示す図で、同図(a)は、その正面図、同図(b)はその左側面図である。この注入補剛部材1は、中空長尺の管状体11と、その管状体11の先端に設けられた略円環状の加圧板12とから構成され、管状体11から削孔内に注入したグラウトを加圧板12により加圧するものである。加圧板12は、削孔の内径、すなわち穿孔ビットの外径とほぼ同じ大きさを有する。これにより、削孔内周面との間に設けられる間隙が最小限になるので、削孔の中心に沿って注入補剛部材1を真っ直ぐに挿入することが可能となり、施工性が向上する。さらに、加圧板12の表面積が最大になるので加圧力も改善される。   1A and 1B are views showing the entire injection stiffening member 1 according to the present invention. FIG. 1A is a front view thereof, and FIG. 1B is a left side view thereof. This injection stiffening member 1 is composed of a hollow long tubular body 11 and a substantially annular pressure plate 12 provided at the tip of the tubular body 11, and a grout injected from the tubular body 11 into a drilling hole. Is pressed by the pressure plate 12. The pressure plate 12 has substantially the same size as the inner diameter of the drilling hole, that is, the outer diameter of the drill bit. As a result, the gap provided between the inner peripheral surface of the hole is minimized, so that the injection stiffening member 1 can be inserted straight along the center of the hole and the workability is improved. Furthermore, since the surface area of the pressure plate 12 is maximized, the pressing force is also improved.

また、加圧板12には、その外周部121から管状体11の外周面まで放射状に半径方向に延びるスリット122が円周方向に等角度の間隔(ここでは例えば、45度とする。)で複数(ここでは例えば、8個とする。)形成されている。そのため、スリット122を設けていない従来の鋼製の加圧板よりも剛性が低くなり、柔軟性を有することから、削孔への注入補剛部材1の挿入性が向上する。また、削孔の内壁から突出する岩によって加圧板12が変形したとしても、スリット122によってその変形が遮断され、加圧板12全体に及ぶことはないので、加圧板12の変形に伴う加圧効率の低下を最小限に止めることができる。   In addition, a plurality of slits 122 extending radially in the radial direction from the outer peripheral portion 121 to the outer peripheral surface of the tubular body 11 are provided in the pressurizing plate 12 at equiangular intervals in the circumferential direction (here, for example, 45 degrees). (Here, for example, 8 pieces are formed.) Therefore, the rigidity is lower than that of a conventional steel pressure plate not provided with the slit 122 and the flexibility is provided, so that the insertability of the injection stiffening member 1 into the hole is improved. Further, even if the pressure plate 12 is deformed by the rock protruding from the inner wall of the drilling hole, the deformation is blocked by the slit 122 and does not reach the entire pressure plate 12. Can be minimized.

さらに、その外周部121とスリット122の交点に、スリット122の幅よりも広い開口を有する切欠部123を形成している。そのため、スリット122と相まって切欠部123を介してグラウトを加圧板12よりも後方の削孔内へ確実に排出することができる。ゆえに、加圧板12は、削孔径またはビット径とほぼ同じ外径に設定してもグラウトの排出性に問題はない。また、各切欠部123は、図1(b)に拡大して示すように三角形の頂点が注入補剛管11側を向き、底辺が外周部121側となるような逆二等辺三角形の形状をなしている。そのため、外周部121側ほど開口の幅が大きくなるので、グラウトの排出性が良く、また、削孔の内壁から突出する岩があっても回避することが可能であり、施工性が向上する。なお、各切欠部123の形状は、逆二等辺三角形状に限らず、半円形状でも、また扇型形状や、4角形、5角形等、特にこだわらないが、前述したように、外周部121側に向かうほど開口の幅が拡がるような形状の方がグラウトの排出性や、削孔の内壁から突出する岩を回避できるため望ましい。また、管状体11は鉄製であるが、加圧板12についてはステンレス製が望ましい。これは、ステンレス製の方が鉄製よりも強度を維持しつつ薄くできるからであり、加圧板12の厚さを薄くすることで、削孔への挿入性が向上する。ただし、加圧板12の厚さをそれほど問題にしないのであれば鉄製でもかまわない。また、この加圧板12には、その裏面側、すなわち管状体11側に、管状体11の内径に応じた外径を有する短尺の接合補助管12aが設けられている。そして、この接合補助管12aの外周面を管状体11の内周面に接着することで、加圧板12は管状体11に固着されている。   Further, a notch 123 having an opening wider than the width of the slit 122 is formed at the intersection of the outer peripheral portion 121 and the slit 122. Therefore, the grout can be reliably discharged into the drilling hole behind the pressure plate 12 through the notch 123 in combination with the slit 122. Therefore, even if the pressure plate 12 is set to an outer diameter that is substantially the same as the hole diameter or the bit diameter, there is no problem in grout discharge. Each notch 123 has an inverted isosceles triangle shape in which the apex of the triangle faces the injection stiffening tube 11 side and the base is the outer peripheral part 121 side as shown in an enlarged view in FIG. There is no. Therefore, since the width of the opening becomes larger toward the outer peripheral portion 121 side, the grout can be easily discharged, and even if there is a rock protruding from the inner wall of the drilling hole, the workability can be improved. The shape of each notch 123 is not limited to an inverted isosceles triangle, but may be a semicircular shape or a sector shape, a quadrangular shape, a pentagonal shape, or the like. It is desirable to have a shape in which the width of the opening increases toward the side, because it is possible to avoid grout discharge and rocks protruding from the inner wall of the drilling hole. The tubular body 11 is made of iron, but the pressure plate 12 is preferably made of stainless steel. This is because stainless steel can be made thinner while maintaining strength than iron, and by reducing the thickness of the pressure plate 12, insertability into the hole is improved. However, if the thickness of the pressure plate 12 does not matter so much, it may be made of iron. The pressurizing plate 12 is provided with a short joining auxiliary tube 12 a having an outer diameter corresponding to the inner diameter of the tubular body 11 on the back surface side thereof, that is, on the tubular body 11 side. The pressure plate 12 is fixed to the tubular body 11 by bonding the outer peripheral surface of the joining auxiliary pipe 12 a to the inner peripheral surface of the tubular body 11.

次に、本発明の注入補剛部材1を使用した維持補修工事の施工手順について図面を参照して説明する。   Next, the construction procedure of the maintenance repair work using the injection stiffening member 1 of the present invention will be described with reference to the drawings.

図2(a)〜(d)は、その施工手順を示す図である。まず、地山2の表面にモルタルを吹付けて補強したモルタル吹付3が、経年変化や地震等により地山2の表面とモルタル吹付3の裏面との間に空洞部4が生じている構造物に対し、図2(a)に示すように、先端に穿孔ビットを装着した削孔部材(図示せず。)等によって削孔5を形成し、その削孔5にロックボルト6を挿入する。なお、図示はしないが、ロックボルト6の先端側(孔底側)には、そのロックボルト6を削孔の中心に位置させるためにスペーサーが設けられる。次に、図2(b)に示すように、本発明の注入補剛部材1の後端にグラウト注入具13をセットした後、管状体11の先端の加圧板12をモルタル吹付3に形成した削孔の開口部31に合わせたうえで、ロックボルト6の頭部から挿入し、管状体11の中にロックボルト6が内挿される。そして、管状体11の先端がモルタル吹付3の背面、すなわち、空洞部4に入った時点で注入補剛部材1の挿入作業を一時中断し、注入具13を操作して、グラウトを注入する。グラウトは、管状体11の中を通り、加圧板12の中央から空洞部4や削孔5内に注入される。これを一次注入という。   2A to 2D are diagrams showing the construction procedure. First, the mortar spray 3 reinforced by spraying mortar on the surface of the natural ground 2 is a structure in which a cavity 4 is formed between the surface of the natural ground 2 and the back surface of the mortar spray 3 due to secular change or earthquake. On the other hand, as shown in FIG. 2A, a hole 5 is formed by a hole member (not shown) having a drill bit attached to the tip, and a lock bolt 6 is inserted into the hole 5. Although not shown, a spacer is provided on the distal end side (hole bottom side) of the lock bolt 6 in order to position the lock bolt 6 at the center of the drilling hole. Next, as shown in FIG. 2 (b), after setting the grout injection tool 13 at the rear end of the injection stiffening member 1 of the present invention, the pressure plate 12 at the tip of the tubular body 11 was formed on the mortar spray 3. After matching with the opening 31 of the drilling hole, the lock bolt 6 is inserted from the head of the lock bolt 6, and the lock bolt 6 is inserted into the tubular body 11. And when the front-end | tip of the tubular body 11 enters the back surface of the mortar spraying 3, ie, the cavity part 4, the insertion operation | work of the injection stiffening member 1 is interrupted temporarily, the injection tool 13 is operated, and grout is inject | poured. The grout passes through the tubular body 11 and is injected from the center of the pressure plate 12 into the cavity 4 and the hole 5. This is called primary injection.

次に、空洞部4や削孔5内にグラウトが充填された後、図2(c)に示すように、注入補剛部材1の挿入作業を再開し、さらに削孔5内に押し込む。これにより、管状体11の先端の加圧板12が削孔5内のグラウトを加圧するので、削孔5の内壁から内部に向けて発生しているクラック(亀裂)51にまでグラウトを圧入することができる。特に、この加圧板12は削孔5の内径とほぼ同じ外径を有するので、最大限の加圧効率を発揮することができると共に、その外周部121がスペーサーの機能も果たすことになる。このことから、削孔5の中心に沿って注入補剛部材1を真っ直ぐに挿入することが可能となり、加圧板の外周縁と削孔内周面との間に大きな間隙が設けられる従来技術よりも施工性が向上する。   Next, after the grout is filled into the cavity 4 or the hole 5, the insertion of the injection stiffening member 1 is resumed and further pushed into the hole 5 as shown in FIG. Thereby, since the pressure plate 12 at the tip of the tubular body 11 pressurizes the grout in the hole 5, the grout is pressed into the crack (crack) 51 generated from the inner wall of the hole 5 toward the inside. Can do. In particular, the pressure plate 12 has substantially the same outer diameter as the inner diameter of the hole 5, so that the maximum pressure efficiency can be exhibited and the outer peripheral portion 121 also functions as a spacer. From this, it becomes possible to insert the injection stiffening member 1 straight along the center of the hole 5, and the conventional technique in which a large gap is provided between the outer peripheral edge of the pressure plate and the inner peripheral surface of the hole. Also improves workability.

そして、図2(d)に示すように、削孔5内に注入補剛部材1全体が埋め込まれた後、さらにグラウト注入具13により一定の圧力をかけてグラウトを削孔5内に注入する。これがグラウトの2次注入である。これにより、削孔5だけでなく、その削孔5に連続しているクラック(亀裂)51にまでグラウトを確実に充填させることができる。そして、グラウトの2次注入完了後は、グラウト注入具13を注入補剛部材1から取り外すが、注入補剛部材1については、削孔5内に埋め込んだままの状態で固定される。なお、その後は従来技術と同様に、ロックボルトの頭部をナット等の固定手段により固定した後、老朽化モルタル吹付の上から新たなモルタルを吹き付けて、維持補修工事が完了する。以上のことより、本発明の注入補剛部材1は、それを介して注入されるグラウトが空洞部4や削孔5の全体、さらには削孔5に連続しているクラック51にまで行き渡り固化するので、地山を強固に補強することができる。   Then, as shown in FIG. 2 (d), after the entire injection stiffening member 1 is embedded in the hole 5, the grout is injected into the hole 5 by applying a certain pressure with the grout injection tool 13. . This is the secondary injection of grout. Thereby, not only the drilling hole 5 but also the crack (crack) 51 continuing to the drilling hole 5 can be filled reliably. Then, after the secondary injection of grout is completed, the grout injection tool 13 is removed from the injection stiffening member 1, but the injection stiffening member 1 is fixed in a state of being embedded in the hole 5. After that, as with the prior art, after fixing the head of the lock bolt with a fixing means such as a nut, a new mortar is sprayed over the aging mortar spray to complete the maintenance repair work. From the above, the injection stiffening member 1 of the present invention is solidified by the grout injected through it reaching the entire cavity 4 and the entire drill hole 5 and further to the crack 51 continuing to the drill hole 5. Therefore, the natural ground can be reinforced strongly.

なお、上述した本発明の実施形態の説明において、スリット122の幅については、特に限定していないが、グラウトの排出性をスリット122によって高めたい場合には、図3に示すように、スリット122の幅Wを広げるようにしても良い。また、切欠部123にてグラウトの排出性を高めたい場合には、図4に示すように、外周部121においてスリット122が形成されていない箇所に切欠部123を設けることもできる。さらに、管状体11の先端部への加圧板12の取り付けは、上述した方法に限らず、図5(a),(b)に示すように、加圧板12の裏面側や表面側に管状体11の外径に応じた内径を有する短尺の接合補助管12bを設けておき、その接合補助管12bの内周面を管状体11の外周面に接着等により固着させても良い。また、接合補助管12bを設けずに、図5(c)に示すように、加圧板12を直接、管状体11の先端面に溶接等で固着するようにしても良い。   In the description of the embodiment of the present invention described above, the width of the slit 122 is not particularly limited. However, when it is desired to increase the grout discharge performance by the slit 122, as shown in FIG. The width W may be increased. In addition, when it is desired to improve the grout dischargeability at the notch 123, the notch 123 can be provided at a location where the slit 122 is not formed on the outer periphery 121 as shown in FIG. Furthermore, the attachment of the pressure plate 12 to the distal end portion of the tubular body 11 is not limited to the above-described method, and as shown in FIGS. 5A and 5B, the tubular body is provided on the back surface side or the front surface side of the pressure plate 12. Alternatively, a short joining auxiliary pipe 12b having an inner diameter corresponding to the outer diameter of 11 may be provided, and the inner peripheral surface of the joining auxiliary pipe 12b may be fixed to the outer peripheral face of the tubular body 11 by bonding or the like. Further, the pressure plate 12 may be directly fixed to the distal end surface of the tubular body 11 by welding or the like, as shown in FIG.

本発明のモルタル吹付の維持補修用注入補剛部材は、グラウトへの加圧力が大きく、また注入補剛部材の直進性にも優れ、さらには、削孔の内壁から突出した岩に当たっても加圧板の全体に変形が及ぶこともなく、地山等から引き抜かなくても構造的に何の問題もないため、老朽化したモルタル吹付の維持補修工法だけでなく、新設の法面補強土やロックボルト工等の技術分野にも産業上の利用可能性がある。   The injection stiffening member for maintaining and repairing the mortar spray according to the present invention has a large pressure applied to the grout, is excellent in the straightness of the injection stiffening member, and further, even if it hits a rock protruding from the inner wall of the drilling hole There is no structural problem even if it is not pulled out from the natural ground, etc., so that not only the maintenance repair method for the aging mortar spraying, but also the newly constructed slope reinforcement soil and rock bolt There is also industrial applicability in technical fields such as engineering.

1…注入補剛部材、11…管状体、12…加圧板、121…外周部、122…スリット、123…切欠部、2…地山、3…モルタル吹付面、4…空洞部、5…削孔、6…ロックボルト。   DESCRIPTION OF SYMBOLS 1 ... Injection stiffening member, 11 ... Tubular body, 12 ... Pressure plate, 121 ... Outer peripheral part, 122 ... Slit, 123 ... Notch part, 2 ... Ground, 3 ... Mortar spray surface, 4 ... Cavity part, 5 ... Cutting Hole, 6 ... Rock bolt.

Claims (1)

鋼製からなる略円環状の加圧板を管状体の先端部に設け、モルタル吹付及び地山に形成した削孔の内部に挿入されたロックボルトを内挿した状態で該削孔内にグラウトを注入すると共に、削孔内に押し込むことでそのグラウトを加圧板により加圧するモルタル吹付の維持補修用注入補剛部材であって、該加圧板は、削孔の内径とほぼ同じ外径を有し、その外周部から管状体の外周面まで延びるスリットが円周方向に適宜間隔で複数形成されていると共に、その外周部とスリットとの交点にそれぞれ切欠部が形成されていることを特徴とするモルタル吹付の維持補修用注入補剛部材。   A substantially annular pressure plate made of steel is provided at the tip of the tubular body, and grout is inserted into the drilled hole with a mortar sprayed and a lock bolt inserted into the drilled hole formed in the ground. Injecting and stiffening member for maintaining and repairing mortar sprayed by pressing the grout with a pressure plate by injecting into the hole, and the pressure plate has an outer diameter substantially the same as the inner diameter of the hole. A plurality of slits extending from the outer peripheral portion to the outer peripheral surface of the tubular body are formed at appropriate intervals in the circumferential direction, and notches are formed at the intersections of the outer peripheral portion and the slit. Injection stiffening member for maintenance repair of mortar spray.
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