JP6497999B2 - Construction method of mirror reinforcement structure - Google Patents

Construction method of mirror reinforcement structure Download PDF

Info

Publication number
JP6497999B2
JP6497999B2 JP2015056801A JP2015056801A JP6497999B2 JP 6497999 B2 JP6497999 B2 JP 6497999B2 JP 2015056801 A JP2015056801 A JP 2015056801A JP 2015056801 A JP2015056801 A JP 2015056801A JP 6497999 B2 JP6497999 B2 JP 6497999B2
Authority
JP
Japan
Prior art keywords
mirror
reinforcing
pipe
weak
restraint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2015056801A
Other languages
Japanese (ja)
Other versions
JP2016176238A (en
Inventor
正 岡部
正 岡部
勉 松尾
勉 松尾
厚 井本
厚 井本
Original Assignee
株式会社ケー・エフ・シー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ケー・エフ・シー filed Critical 株式会社ケー・エフ・シー
Priority to JP2015056801A priority Critical patent/JP6497999B2/en
Publication of JP2016176238A publication Critical patent/JP2016176238A/en
Application granted granted Critical
Publication of JP6497999B2 publication Critical patent/JP6497999B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Excavating Of Shafts Or Tunnels (AREA)

Description

本発明は、トンネル掘削時の鏡補強に用いられる鏡補強構造の構築方法に関する。 The present invention relates to a method for constructing a mirror reinforcement structure used for mirror reinforcement during tunnel excavation.

トンネル掘削時には、地山の応力開放が生じて切羽が不安定化し、崩落の危険性が高まるため、対策として、一定程度掘進するごとに支保を設置したり、鏡補強を施すことが行われている。鏡補強に着目すると、鏡補強を施さない場合には、掘削により前方地山が塑性領域化して周辺地山が不安定となり、崩落の危険性が高まるばかりでなく、天端や側壁の崩落を防止するための支保に想定外の負荷を生じさせる恐れもある。   During tunnel excavation, the stress of the ground is released, the face becomes unstable, and the risk of collapse increases. Therefore, as a countermeasure, a support is installed or mirror reinforcement is applied each time a certain degree of excavation is performed. Yes. Focusing on the mirror reinforcement, if the mirror reinforcement is not applied, the excavated ground will become a plastic region and the surrounding ground will become unstable, increasing the risk of collapse, as well as causing the top and side walls to collapse. There is also a risk of causing an unexpected load on the support to prevent.

鏡補強を施す構造としては、管状または線状の補強材を前方地山に打設する構造や、鏡面に吹付コンクリートを形成する構造がある。特に前方地山に長尺の管状補強材を打設し、固結材を注入して管状補強材の外周に固結材を充填する構造は、脆弱な地山に対しても有効であり、多様な地質の地山に適用が可能である。   As a structure for applying mirror reinforcement, there are a structure in which a tubular or linear reinforcing material is placed on a front ground, and a structure in which spray concrete is formed on a mirror surface. In particular, a structure in which a long tubular reinforcing material is placed in the front ground, the consolidated material is injected, and the outer periphery of the tubular reinforcing material is filled with the consolidated material is also effective for vulnerable ground. It can be applied to various geological grounds.

特許文献1には、前方地山に長尺の管状補強材を打設して周囲に固結材を充填する鏡補強構造が開示されている。この鏡補強構造では、打設する長尺の管状補強材の周面付着力を高めるために、外周面の略全長に亘って螺旋状の溝が設けられた管状補強材や、外周面の略全長に亘って凸部が略メッシュ状に規則的に配置された管状補強材が用いられている(特許文献1の図7〜図9、段落[0036]〜[0040]参照)。   Patent Document 1 discloses a mirror reinforcing structure in which a long tubular reinforcing material is placed on a front ground and a caking material is filled around. In this mirror reinforcing structure, in order to increase the peripheral surface adhesion of the long tubular reinforcing material to be placed, the tubular reinforcing material provided with a spiral groove over substantially the entire length of the outer peripheral surface, A tubular reinforcing material in which convex portions are regularly arranged in a substantially mesh shape over the entire length is used (see FIGS. 7 to 9 and paragraphs [0036] to [0040] of Patent Document 1).

特開2009−197573号公報JP 2009-197573 A

しかしながら、特許文献1のような長尺の管状補強材の略全長に亘って地山との付着力を高くする構造、換言すれば長尺に亘って前方地山を連続的に強く拘束して安定性を高める構造では、補強後の掘進で管状補強材や固結領域を除去した際に、急激な応力開放が生じて地山が不安定化し、大きな歪が生じて支保に強い負荷が作用する場合があり、支保の補強を余儀なくされる。   However, a structure that increases the adhesion to the ground over almost the entire length of the long tubular reinforcing material as in Patent Document 1, in other words, the front ground is strongly constrained continuously over the long length. With a structure that enhances stability, when removing the tubular reinforcement or consolidated area in the post-reinforcement excavation, sudden stress release occurs, the ground becomes unstable, and a large strain occurs, causing a strong load on the support. You will be forced to reinforce the support.

一方、全長に亘って補強材の外周面と周囲の地山との拘束力が低くなる鏡補強構造の場合、補強後に掘進した際の地山の応力開放が穏やかで小さくなり、支保への負荷が小さくなるものの、補強材と周囲の地山との拘束力の低さにより、掘削時に切羽前方が広範囲に塑性領域化し、周辺地山が不安定化する場合も生ずる。   On the other hand, in the case of a mirror reinforced structure where the binding force between the outer peripheral surface of the reinforcing material and the surrounding ground is low over the entire length, the stress release of the ground when digging after reinforcement is gentle and small, and the load on the support However, due to the low restraining force between the reinforcing material and the surrounding ground, the front of the face becomes a plastic region in a wide range during excavation, and the surrounding ground may become unstable.

本発明は上記課題に鑑み提案するものであって、鏡補強工で鏡補強材と周囲の地山を適切に定着させ、周辺地山を安定させた状態でトンネル掘進を行うことを可能にすると共に、補強後のトンネル掘進時に支保にかかる負荷を小さくし、支保の補強を不要にすることができる鏡補強構造の構築方法を提供することを目的とする。 The present invention is proposed in view of the above problems, and it is possible to appropriately fix the mirror reinforcing material and the surrounding natural ground by mirror reinforcement, and to perform tunnel excavation in a state where the peripheral natural ground is stabilized. A further object is to provide a method for constructing a mirror reinforcing structure that can reduce the load applied to the support during tunnel excavation after reinforcement and can eliminate the need for reinforcement of the support.

本発明の鏡補強構造の構築方法は、鏡面から前方地山に長尺の鏡補強材が打設され、前記鏡補強材が、前記鏡面の近傍に配置される第1の弱拘束部と、前記第1の弱拘束部の前側に前方に向かって強弱の順で交互に配置される強拘束部及び第2の弱拘束部とを備え、 前記強拘束部を3箇所以上備え、前記強拘束部が、前記第1の弱拘束部と前記第2の弱拘束部のいずれよりも短尺で形成されていると共に、前記第1の弱拘束部と前記第2の弱拘束部のいずれよりも周囲の地山への拘束力が大きくなるように形成され、 管状の前記第1の弱拘束部及び前記第2の弱拘束部に間隔を開けて形成された注入孔から、前記鏡補強材の内部に注入された固結材を前記鏡補強材の外周の空隙に充填して、前記鏡補強材が地山に定着されている鏡補強構造を構築する方法であって、ビットユニットに、前記第2の弱拘束部を構成する外周面に間隔を開けて注入孔が形成された先頭補強管をケーシングシューを介して接続して、鏡面から前方地山に打設する第1工程と、前記強拘束部を構成する管継手を介して、前記第2の弱拘束部を構成する外周面に間隔を開けて注入孔が形成された中間補強管を接続して、鏡面から前方地山に打設する第2工程と、打設した前記中間補強管に後続する前記中間補強管を前記管継手を介して接続して、鏡面から前方地山に打設し、必要に応じて後続する前記中間補強管の前記管継手を介しての接続と打設を繰り返し、鏡面近傍に最後尾の前記中間補強管を配置する第3工程と、前記ビットユニットに動力を伝達するロッドを抜き出し、前記先頭補強管及び前記中間補強管の内部に固結材を注入し、前記先頭補強管の注入孔及び前記中間補強管の注入孔から前記鏡補強材の外周にある空隙に固結材を充填して前記鏡補強材を地山に定着させる第4工程とを備えることを特徴とする。
これによれば、強拘束部と第2の弱拘束部が交互に配置されて両端部に強拘束部を備えて構成される当初の長い補強区間を鏡面近傍よりも奥に配置し、この長い補強区間の強い拘束効果で地山を補強することにより、地山の崩壊挙動、周辺地山の塑性化の進展を抑制することができ、更に、複数の鏡補強材を並行に打設して長い補強区間を並行して複数設ける場合には、並行する長い補強区間で構成される当初の補強領域を鏡面近傍よりも奥に形成することができ、地山の崩壊挙動、周辺地山の塑性化の進展をより確実に抑制することができる。特に、固結材を鏡補強材の外周の空隙に充填して鏡補強材を地山に定着させることで、鏡補強材の地山への定着と地山に対する拘束をより確実に行うことができ、更に、補強区間の両端部分を強拘束部とし、且つ固結材を介して両端の強拘束部や中間に位置する強拘束部の拘束力を分散して広げ、補強区間及び補強領域における鏡補強材、固結材、地山の定着状態の一体性を高めることができる。また、鏡面近傍に配置される拘束力が弱い第1の弱拘束部で構成される当初の変位許容区間が、鏡面近傍の地山を必要以上に拘束せずにある程度の地山変位を許容し、複数の鏡補強材を地山に並行に打設する場合にも地山変位を許容する当初の変位許容領域を鏡面近傍に形成することができ、これにより、トンネル掘削時に急激な応力開放が生ずることを防止でき、支保への作用応力を抑制することができる。従って、鏡補強工で鏡補強材と周囲の地山を適切に定着させ、周辺地山を安定させた状態でトンネル掘進を行うことが可能になると共に、補強後のトンネル掘進時に支保にかかる負荷を小さくし、支保の補強を不要にすることができる。更に、鏡補強材の打設後にトンネル掘進の進行に伴い、強拘束部のうち最後部に位置する強拘束部の地山への拘束力が弱まり、その強拘束部のすぐ前の第2の弱拘束部が変位許容区間、変位許容領域として徐々に機能するようになるので、新たな変位許容区間、変位許容領域と新たな補強区間、補強領域が形成され、支保設置区間毎等の掘削後において周辺地山の安定化と支保への負荷低減を図ることができる。また、ビットユニット、ケーシングシュー、補強管、管継手を用いて鏡補強材の打設を行う削孔方式において、特別な部材を別途に用いる必要がなく、使用する各部材に必要なサイズや外形等に変更するのみで、所要構成の鏡補強構造を構築することができる。
The method for constructing a mirror reinforcing structure of the present invention includes a first weak restraint portion in which a long mirror reinforcing material is placed from a mirror surface to a front ground, and the mirror reinforcing material is disposed in the vicinity of the mirror surface; A strong restraint portion and a second weak restraint portion, which are alternately arranged in the order of strength on the front side of the first weak restraint portion, comprising three or more strong restraint portions; The portion is formed to be shorter than both the first weak restraint portion and the second weak restraint portion, and is more peripheral than both the first weak restraint portion and the second weak restraint portion. The inside of the mirror reinforcing material is formed from an injection hole formed at a distance from the tubular first weak restraint portion and the second weak restraint portion. Mirror reinforcement structure in which the caulking material injected into is filled in the gap on the outer periphery of the mirror reinforcement, and the mirror reinforcement is fixed to the ground A method of constructing, in bit units, the first reinforcing pipe injection hole spaced outer peripheral surface is formed constituting the second weak restraining portion are connected via the casing shoe, forward from the mirror An intermediate reinforcing pipe in which an injection hole is formed at an interval on the outer peripheral surface constituting the second weak restraint part through the first step of placing in the ground and the pipe joint constituting the strong restraint part And connecting the intermediate reinforcement pipe following the placed intermediate reinforcement pipe through the pipe joint to the front ground from the mirror surface. A third step of placing the intermediate reinforcing pipe at the end in the vicinity of the mirror surface by repeatedly connecting and placing the intermediate reinforcing pipe through the pipe joint as required and placing the intermediate reinforcing pipe through the pipe joint; Pull out the rod that transmits power to the front reinforcing pipe and the middle A solidifying material is injected into the inside of the reinforcing tube, and the mirror reinforcing material is filled by filling the gap in the outer periphery of the mirror reinforcing material from the injection hole of the leading reinforcing tube and the injection hole of the intermediate reinforcing tube. And a fourth step of fixing to a natural ground.
According to this, the initially long reinforcing section constituted by arranging the strong restraining portions and the second weak restraining portions alternately and having the strong restraining portions at both ends is arranged behind the mirror surface, and this long By reinforcing the natural ground with a strong restraining effect in the reinforcement section, it is possible to suppress the collapse behavior of the natural ground and the progress of plasticization of the surrounding natural ground, and in addition, multiple mirror reinforcements can be placed in parallel When multiple long reinforcement sections are provided in parallel, the initial reinforcement area consisting of parallel long reinforcement sections can be formed behind the mirror surface, and the collapse behavior of the natural ground, the plasticity of the surrounding natural ground The progress of computerization can be more reliably suppressed. In particular, by fixing the mirror reinforcing material to the natural ground by filling the outer periphery of the mirror reinforcing material with the caking material, the mirror reinforcing material can be more firmly fixed and restrained to the natural ground. In addition, both ends of the reinforcing section are used as strongly constraining portions, and the binding force of the strong constraining portions at both ends and the strong constraining portion located in the middle is dispersed and spread through the binder, and in the reinforcing section and the reinforcing region It is possible to enhance the integrity of the mirror reinforcing material, the caking material, and the ground state. In addition, the initial allowable displacement section composed of the first weakly constrained portion with a weak restraining force placed near the mirror surface allows a certain amount of ground displacement without restraining the ground near the mirror surface more than necessary. Even when multiple mirror stiffeners are placed in parallel to the ground, the initial displacement allowance area that allows ground displacement can be formed near the mirror surface, which allows rapid stress release during tunnel excavation. This can be prevented, and the stress acting on the support can be suppressed. Therefore, it is possible to perform tunnel excavation with the mirror reinforcement material and the surrounding natural ground properly fixed by the mirror reinforcement, and the surrounding natural ground stabilized, and the load applied to the support during tunnel excavation after reinforcement It is possible to make the support smaller. Furthermore, with the progress of tunnel excavation after the placement of the mirror reinforcement, the restraining force to the ground of the strong restraint portion located at the rearmost portion of the strong restraint portion is weakened, and the second force immediately before the strong restraint portion is reduced. Since the weak restraint part gradually functions as a displacement permissible section and a displacement permissible area, a new displacement permissible section, a displacement permissible area and a new reinforcement section, a reinforcement area are formed, and after excavation for each support installation section, etc. Therefore, it is possible to stabilize the surrounding ground and reduce the load on the support. In addition, in the drilling method in which mirror reinforcing material is cast using a bit unit, casing shoe, reinforcing pipe, and pipe joint, there is no need to use a special member separately, and the size and outer shape required for each member to be used. A mirror reinforcing structure having a required configuration can be constructed only by changing to the above.

本発明の鏡補強構造の構築方法は、前記第1の弱拘束部、前記第2の弱拘束部、前記強拘束部がそれぞれ鋼製であり、前記第1の弱拘束部及び前記第2の弱拘束部の外周面が平滑に形成されていると共に、前記強拘束部の外周面に凹凸が形成されていることを特徴とする。In the construction method of the mirror reinforcing structure of the present invention, the first weak restraint portion, the second weak restraint portion, and the strong restraint portion are each made of steel, and the first weak restraint portion and the second weak restraint portion are made of steel. The outer peripheral surface of the weakly restrained portion is formed smoothly and irregularities are formed on the outer peripheral surface of the strongly restrained portion.
これによれば、第1の弱拘束部及び第2の弱拘束部の外周面を平滑にすることで、地山に対して拘束が必要以上に過大になることを確実に防止できると共に、離間して設けられる強拘束部の外周面の凹凸の嵌め合いや表面積増加による拘束力の向上により、地山を強く拘束し、地山の崩壊挙動の抑制、周辺地山の塑性化の進展の抑制に必要な補強をより確実に行うことができる。According to this, by smoothing the outer peripheral surfaces of the first weakly restraining part and the second weakly restraining part, it is possible to reliably prevent the restraint from becoming excessively excessive with respect to the natural ground, and to separate them. The hard ground is strongly restrained by fitting the unevenness of the outer peripheral surface of the strong restraint part provided and improving the restraint force by increasing the surface area, suppressing the collapse behavior of the natural ground, and suppressing the progress of plasticization of the surrounding natural ground The necessary reinforcement can be more reliably performed.

本発明によれば、鏡補強工で鏡補強材と周囲の地山を適切に定着させ、周辺地山を安定させた状態でトンネル掘進を行うことを可能にすると共に、補強後のトンネル掘進時に支保にかかる負荷を小さくし、支保の補強を不要にすることができる。   According to the present invention, it is possible to appropriately fix the mirror reinforcing material and the surrounding natural ground by the mirror reinforcing work, and to perform the tunnel excavation in a state where the peripheral natural ground is stabilized, and at the time of tunnel excavation after the reinforcement The load applied to the support can be reduced, and the reinforcement of the support can be made unnecessary.

本発明による第1実施形態の鏡補強材を有する鏡補強構造を示す縦断説明図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal explanatory view showing a mirror reinforcing structure having a mirror reinforcing material according to a first embodiment of the present invention. 図1のA部の拡大図。The enlarged view of the A section of FIG. 図1のB部の拡大図。The enlarged view of the B section of FIG. 図1のC部の拡大図。The enlarged view of the C section of FIG. 第1実施形態の鏡補強材を有する鏡補強構造が設置された鏡面を示す正面説明図。Front explanatory drawing which shows the mirror surface in which the mirror reinforcement structure which has the mirror reinforcement material of 1st Embodiment was installed. (a)は第1実施形態における中間補強管の正面図、(b)は第1実施形態におけるビットユニット、ケーシングシューが取り付けられた状態の先頭補強管を示す正面図、(c)は第1実施形態における管継手の正面図。(A) is a front view of the intermediate reinforcement pipe in the first embodiment, (b) is a front view showing the top reinforcement pipe in a state where the bit unit and the casing shoe are attached in the first embodiment, and (c) is the first view. The front view of the pipe joint in embodiment. 第1実施形態の鏡補強材を鏡面から前方地山に打設する施工工程の概要を示す模式図。The schematic diagram which shows the outline | summary of the construction process which drives the mirror reinforcement material of 1st Embodiment to a front natural ground from a mirror surface. 打設した第1実施形態の鏡補強材への固結材の注入を説明する縦断説明図。Longitudinal explanatory drawing explaining injection | pouring of the solidification material to the mirror reinforcement material of 1st Embodiment which was laid. 本発明による第2実施形態の鏡補強材を有する鏡補強構造を示す縦断説明図。Vertical explanatory drawing which shows the mirror reinforcement structure which has the mirror reinforcement material of 2nd Embodiment by this invention. (a)は第2実施形態における中間補強管の正面図、(b)は第2実施形態におけるビットユニット、ケーシングシューが取り付けられた状態の先頭補強管を示す正面図、(c)は第2実施形態における管継手の正面図。(A) is a front view of an intermediate reinforcing pipe in the second embodiment, (b) is a front view showing a top reinforcing pipe in a state where a bit unit and a casing shoe are attached in the second embodiment, and (c) is a second view. The front view of the pipe joint in embodiment.

〔第1実施形態の鏡補強材、鏡補強構造及びその構築方法〕
本発明による第1実施形態の鏡補強材1は、図1〜図5に示すように、トンネル掘削の鏡補強工で鏡面102から前方の地山101に打設される長尺の鏡補強材1であり、鏡面102の近傍に配置される第1の弱拘束部2と、第1の弱拘束部2の前側に前方に向かって強弱の順で交互に配置される強拘束部3及び第2の弱拘束部4を備え、その先端部が強拘束部3になっている。長尺の鏡補強材1の長さは、6m〜20m程度のものとすることが好ましい。
[Mirror Reinforcement Material, Mirror Reinforcement Structure and Construction Method of First Embodiment]
As shown in FIGS. 1 to 5, the mirror reinforcing material 1 according to the first embodiment of the present invention is a long mirror reinforcing material that is cast from a mirror surface 102 to a front ground 101 by mirror excavation for tunnel excavation. 1 and the first weak restraint portion 2 disposed in the vicinity of the mirror surface 102, and the strong restraint portions 3 and the first restraint portion 3 alternately disposed in the order of the strength toward the front on the front side of the first weak restraint portion 2. Two weak restraint portions 4 are provided, and the tip portion thereof is a strong restraint portion 3. The length of the long mirror reinforcing material 1 is preferably about 6 to 20 m.

強拘束部3は、第1の弱拘束部2と第2の弱拘束部4のいずれよりも短尺で形成されていると共に、第1の弱拘束部2と第2の弱拘束部4のいずれよりも周囲の地山101への拘束力が大きくなるように形成されている。強拘束部3は3箇所以上の複数箇所設けられ、図示例では4箇所の強拘束部3が設けられている。尚、図中、103は鏡面102を覆うように形成される吹付コンクリート、104はトンネルの天端と側壁に沿ってトンネル掘削方向の1m程度など所定間隔毎に建て込まれる支保、105は支保104・104間の天端や側壁の周面を覆うように形成される吹付コンクリートである。   The strong restraint portion 3 is formed to be shorter than both the first weak restraint portion 2 and the second weak restraint portion 4, and any of the first weak restraint portion 2 and the second weak restraint portion 4 is used. It is formed so that the restraining force to the surrounding natural ground 101 becomes larger. The strong restraint portions 3 are provided at a plurality of locations of three or more, and in the illustrated example, four strong restraint portions 3 are provided. In the figure, 103 is shotcrete formed so as to cover the mirror surface 102, 104 is a support built at predetermined intervals such as about 1 m in the tunnel excavation direction along the top and side walls of the tunnel, and 105 is a support 104. -It is sprayed concrete formed so that the top end between 104 and the surrounding surface of a side wall may be covered.

本例の第1の弱拘束部2と先頭以外の第2の弱拘束部4は、図1〜図4に示すように、円筒状の補強管である中間補強管5で構成される。中間補強管5は、図6(a)に示すように、外周面が平滑に形成されている本体51を有し、本体51の両端部にそれぞれ雄ねじ部52・52が形成されていると共に、本体51には複数の注入孔53が形成されている。注入孔53は、中間補強管5の内部に注入される固結材を吐出し、鏡補強材1の外周面にある空隙に充填して閉塞し、鏡補強材1を地山101に定着させる注入が可能に、所定箇所に間隔を開けて形成されている。また、中間補強管5には、トンネル掘削時に中間補強管5を切除し易くするための切除溝54が、長手方向に間隔を開けて形成されている。   As shown in FIGS. 1 to 4, the first weak restraint portion 2 and the second weak restraint portion 4 other than the head of the present example are configured by an intermediate reinforcement tube 5 that is a cylindrical reinforcement tube. As shown in FIG. 6 (a), the intermediate reinforcing pipe 5 has a main body 51 having a smooth outer peripheral surface, and male screw parts 52 and 52 are formed at both ends of the main body 51, respectively. A plurality of injection holes 53 are formed in the main body 51. The injection hole 53 discharges the consolidated material injected into the intermediate reinforcing pipe 5, fills and closes the gap in the outer peripheral surface of the mirror reinforcing material 1, and fixes the mirror reinforcing material 1 to the ground 101. It is formed at intervals at predetermined locations so that injection is possible. In addition, the intermediate reinforcing pipe 5 is formed with cut grooves 54 for making it easy to cut the intermediate reinforcing pipe 5 during tunnel excavation with an interval in the longitudinal direction.

最前部に位置する先頭の第2の弱拘束部4は、図1及び図4に示すように、円筒状の補強管である先頭補強管6で構成される。先頭補強管6は、図6(b)に示すように、外周面が平滑に形成されている本体61を有し、本体61の一方の端部に雄ねじ部62が形成され、他方の端部にも図示省略する雄ねじ部が形成されて後述するケーシングシュー8を螺合して取付可能になっている。先頭補強管6の本体61にも複数の注入孔63が形成され、注入孔63も、先頭補強管6の内部に注入される固結材を吐出し、鏡補強材1の外周面にある空隙に充填して閉塞し、鏡補強材1を地山101に定着させる注入が可能に、所定箇所に間隔を開けて形成されている。また、先頭補強管6にも中間補強管5と同様に切除溝64が形成されている。   As shown in FIGS. 1 and 4, the leading second weakly restraining portion 4 located at the foremost portion is composed of a leading reinforcing tube 6 that is a cylindrical reinforcing tube. As shown in FIG. 6 (b), the leading reinforcing pipe 6 has a main body 61 having a smooth outer peripheral surface, a male threaded portion 62 is formed at one end of the main body 61, and the other end. In addition, a male thread portion (not shown) is formed, and a casing shoe 8 described later can be screwed and attached. A plurality of injection holes 63 are also formed in the main body 61 of the front reinforcing tube 6, and the injection holes 63 also discharge the consolidated material injected into the inside of the front reinforcing tube 6, and voids on the outer peripheral surface of the mirror reinforcing material 1. The mirror reinforcing material 1 is formed at a predetermined interval so that it can be injected and fixed to the natural ground 101. Further, similarly to the intermediate reinforcing tube 5, a cut groove 64 is formed in the leading reinforcing tube 6.

最前部以外の強拘束部3は、図1、図3、図4及び図6(c)に示すように、補強管相互の接続、即ち中間補強管5・5相互の接続や、中間補強管5と先頭補強管6との接続を行う円筒状の管継手7で構成される。管継手7には、内側に図示省略する雌ねじが形成されており、中間補強管5の雄ねじ部52や先頭補強管6の雄ねじ部62と螺合可能になっている。   As shown in FIGS. 1, 3, 4, and 6 (c), the strong restraint portion 3 other than the foremost portion is connected between the reinforcing pipes, that is, between the intermediate reinforcing pipes 5 and 5, or between the intermediate reinforcing pipes. 5 and a cylindrical pipe joint 7 for connecting the leading reinforcing pipe 6. A female screw (not shown) is formed on the inner side of the pipe joint 7 and can be screwed into the male screw part 52 of the intermediate reinforcing pipe 5 and the male screw part 62 of the leading reinforcing pipe 6.

本例の管継手7の外径は、第1の弱拘束部2を構成する中間補強管5、先頭以外の第2の弱拘束部4を構成する中間補強管5、先頭の第2の弱拘束部4を構成する先頭補強管6のいずれよりも大径で形成されている。更に、管継手7の外周面には、細長形状で外側に突出し、略均等な繰り返しで島状に配列された突起71が形成されており、この突起71の形成箇所と形成されていない箇所で管継手7の外周面に凹凸が形成されている。   The outer diameter of the pipe joint 7 of the present example is such that the intermediate reinforcing pipe 5 constituting the first weakly restraining portion 2, the intermediate reinforcing pipe 5 constituting the second weakly restraining portion 4 other than the leading portion, and the leading second weakness portion. It is formed with a larger diameter than any of the leading reinforcing pipes 6 constituting the restraining portion 4. Furthermore, on the outer peripheral surface of the pipe joint 7, there are formed protrusions 71 that are elongated and project outward, and are arranged in an island shape with substantially uniform repetition. Irregularities are formed on the outer peripheral surface of the pipe joint 7.

最前部の強拘束部3は、図4及び図6(b)に示すように、先頭補強管6に取り付けられるケーシングシュー8で構成される。ケーシングシュー8の後側部分の外周面にも、細長形状で外側に突出し、略均等な繰り返しで島状に配列された突起81が形成されており、この突起81の形成箇所と形成されていない箇所でケーシングシュー8の外周面に凹凸が形成されている。突起81の成すケーシングシュー8の外径は、第1の弱拘束部2を構成する中間補強管5、先頭以外の第2の弱拘束部4を構成する中間補強管5、先頭の第2の弱拘束部4を構成する先頭補強管6のいずれよりも大径で形成されている。   As shown in FIGS. 4 and 6B, the foremost strong restraint portion 3 is composed of a casing shoe 8 attached to the leading reinforcing pipe 6. On the outer peripheral surface of the rear portion of the casing shoe 8, projections 81 projecting outward in an elongated shape and arranged in an island shape with substantially equal repetitions are formed, and are not formed as locations where the projections 81 are formed. Concavities and convexities are formed on the outer peripheral surface of the casing shoe 8 at some points. The outer diameter of the casing shoe 8 formed by the projection 81 is such that the intermediate reinforcing pipe 5 constituting the first weakly restraining portion 2, the intermediate reinforcing pipe 5 constituting the second weakly restraining portion 4 other than the leading portion, and the leading second portion. It is formed with a larger diameter than any of the leading reinforcing pipes 6 constituting the weak restraint portion 4.

ケーシングシュー8の前側部分には、ケーシングシュー8の一部であるケーシングトップ8aを有し、ケーシングトップ8aを介してビットユニット9が設けられている。ビットユニット9は、第1の弱拘束部2を構成する中間補強管5、先頭以外の第2の弱拘束部4を構成する中間補強管5、先頭の第2の弱拘束部4を構成する先頭補強管6のいずれよりも大径の胴部91と、凹凸形状で形成されているビットカッター部92を有する。   A front portion of the casing shoe 8 has a casing top 8a which is a part of the casing shoe 8, and a bit unit 9 is provided via the casing top 8a. The bit unit 9 constitutes the intermediate reinforcement pipe 5 constituting the first weak restraint part 2, the intermediate reinforcement pipe 5 constituting the second weak restraint part 4 other than the head, and the leading second weak restraint part 4. It has a body 91 having a larger diameter than any of the top reinforcing pipes 6 and a bit cutter part 92 formed in an uneven shape.

そして、鏡面102の近傍に第1の弱拘束部2の中間補強管5を配置するようにして、鏡補強材1を鏡面102から前方の地山101に打設すると共に、鏡補強材1の内部に固結材を注入し、管状の第1の弱拘束部2及び第2の弱拘束部4に相当する中間補強管5、先頭補強管6の注入孔53、63から固結材を鏡補強材1の外周にある空隙に充填して、鏡補強材1を地山101に定着させることにより、本実施形態の鏡補強構造が構築されている(図1参照)。図1中、10aは鏡面102の近傍の地山101に形成される鏡補強構造の当初の変位許容区間であり、10bは変位許容区間の前方の地山101に形成される鏡補強構造の当初の補強区間である。   Then, the intermediate reinforcing pipe 5 of the first weakly restraining portion 2 is arranged in the vicinity of the mirror surface 102 so that the mirror reinforcing material 1 is driven from the mirror surface 102 to the front ground 101 and the mirror reinforcing material 1 The solidified material is injected into the interior, and the solidified material is mirrored from the injection holes 53 and 63 of the intermediate reinforcing pipe 5 and the top reinforcing pipe 6 corresponding to the tubular first weakly restraining portion 2 and the second weakly restraining portion 4. The mirror reinforcing structure of the present embodiment is constructed by filling the gap in the outer periphery of the reinforcing material 1 and fixing the mirror reinforcing material 1 to the ground 101 (see FIG. 1). In FIG. 1, 10a is an initial displacement permissible section of the mirror reinforcement structure formed in the natural ground 101 near the mirror surface 102, and 10b is an initial mirror reinforcement structure formed in the natural ground 101 in front of the displacement allowable section. This is a reinforcing section.

本実施形態の鏡補強構造を構築する際には、例えば二重管削孔方式により、ビットユニット9と先頭補強管6をケーシングシュー8を介して接続すると共に、先頭補強管6内に挿入されるドリルジャンボ11のロッド111をビットユニット9に動力伝達可能に連結し、ビットユニット9、ケーシングシュー8及び先頭補強管6を鏡面102から前方の地山101に削孔して打設する(図7参照)。   When constructing the mirror reinforcing structure of the present embodiment, the bit unit 9 and the leading reinforcing pipe 6 are connected via the casing shoe 8 and inserted into the leading reinforcing pipe 6 by, for example, a double pipe drilling method. The rod 111 of the drill jumbo 11 is connected to the bit unit 9 so that power can be transmitted, and the bit unit 9, the casing shoe 8 and the top reinforcing pipe 6 are drilled from the mirror surface 102 to the front ground 101 to be driven (see FIG. 7).

そして、先頭補強管6の後端部分を残した状態で打設を中断し、ロッド111を継ぎ足すと共に、管継手7を先頭補強管6の雄ねじ部62と後続の中間補強管5の前端側の雄ねじ部52に螺合することにより、管継手7を介して後続の中間補強管5を継ぎ足す。その後、削孔、打設を再開し、ビットユニット9、ケーシングシュー8及び先頭補強管6と、管継手7、後続の中間補強管5を前方の地山101に打設していく。   Then, the placement is interrupted with the rear end portion of the leading reinforcing pipe 6 left, the rod 111 is added, and the pipe joint 7 is connected to the male threaded portion 62 of the leading reinforcing pipe 6 and the front end side of the subsequent intermediate reinforcing pipe 5. The subsequent intermediate reinforcing pipe 5 is added via the pipe joint 7 by screwing into the male threaded portion 52 of the pipe. After that, the drilling and driving are resumed, and the bit unit 9, the casing shoe 8, the leading reinforcing pipe 6, the pipe joint 7, and the subsequent intermediate reinforcing pipe 5 are driven in the front ground 101.

次いで、中間補強管5の後端部分を残した状態で打設を中断し、ロッド111を継ぎ足すと共に、管継手7を打設した中間補強管5の後端側の雄ねじ部52と次順位で後続する中間補強管5の前端側の雄ねじ部52に螺合することにより、管継手7を介して次順位で後続する中間補強管5を継ぎ足す。その後、削孔、打設を再開し、ビットユニット9、ケーシングシュー8及び先頭補強管6と、管継手7、後続する中間補強管5、5を前方の地山101に打設していく。このロッド111の継ぎ足し、後続する中間補強管5の管継手7を介しての接続、継ぎ足しと打設を交互に行う工程は必要に応じて繰り返し行う。   Next, the placing is interrupted while leaving the rear end portion of the intermediate reinforcing pipe 5, the rod 111 is added, and the male thread portion 52 on the rear end side of the intermediate reinforcing pipe 5 in which the pipe joint 7 is placed is ranked next. Then, the subsequent intermediate reinforcing pipe 5 is added in the next order through the pipe joint 7 by screwing into the male threaded portion 52 on the front end side of the subsequent intermediate reinforcing pipe 5. Thereafter, the drilling and driving are resumed, and the bit unit 9, the casing shoe 8 and the leading reinforcing pipe 6, the pipe joint 7, and the subsequent intermediate reinforcing pipes 5 and 5 are driven into the front ground 101. The process of adding the rod 111, connecting the intermediate reinforcing pipe 5 through the pipe joint 7, and alternately adding and placing is repeated as necessary.

次いで、最後尾の中間補強管5の略全長が地山101に埋設される状態で打設を完了し、最後尾の中間補強管5を鏡面102近傍に配置して鏡補強材1を形成した後、ビットユニット9に動力を伝達するロッド111を抜き出して回収する。更に、最後尾の中間補強管5から注入ホース12を鏡補強材1に挿入し、最後尾の中間補強管5の後端開口に逆止弁121を設け、鏡補強材1の内部に固結材を注入する(図8参照)。固結材には、ウレタン系或いはセメント系等の適宜の固結材を用いるが、ウレタン系の固結材等の短時間で硬化するものを用いる場合には、鏡補強材1内に隔壁となるパッカー122を挿入して配置し、注入領域を限定して先頭側の領域から段階的に注入を行う。   Next, the placement was completed in a state where the substantially entire length of the last intermediate reinforcing pipe 5 was embedded in the natural ground 101, and the last intermediate reinforcing pipe 5 was arranged in the vicinity of the mirror surface 102 to form the mirror reinforcing material 1. Thereafter, the rod 111 that transmits power to the bit unit 9 is extracted and collected. Further, the injection hose 12 is inserted into the mirror reinforcing member 1 from the rearmost intermediate reinforcing tube 5, and a check valve 121 is provided at the rear end opening of the rearmost intermediate reinforcing tube 5, and is solidified inside the mirror reinforcing member 1. Material is injected (see FIG. 8). As the caking material, an appropriate caking material such as urethane or cement is used, but when using a material that hardens in a short time such as an urethane caking material, a partition wall is provided in the mirror reinforcing material 1. The packer 122 is inserted and arranged, and the injection region is limited, and the injection is performed step by step from the top region.

鏡補強材1内に注入された固結材は、先頭補強管6の注入孔63及び中間補強管5の注入孔53から流出し、鏡補強材1の外周にある空隙に充填される。充填された固結材は所定時間経過後に硬化し、鏡補強材1と充填された固結材とが付着し、固結材を介して鏡補強材1が地山101に定着される。これらの鏡補強材1の打設及び鏡補強材1の地山101に対する配置の調整、固結材の注入の工程を所要箇所に施すことで、地山101の内部に当初の変位許容区間10a及び補強区間10bを形成し、並行する変位許容区間10a及び補強区間10bで当初の変位許容領域及び補強領域を形成し、本実施形態の鏡補強構造を構築する。   The consolidated material injected into the mirror reinforcing material 1 flows out of the injection hole 63 of the leading reinforcing tube 6 and the injection hole 53 of the intermediate reinforcing tube 5 and is filled in the gap on the outer periphery of the mirror reinforcing material 1. The filled consolidated material is cured after a lapse of a predetermined time, the mirror reinforcing material 1 and the filled consolidated material are adhered, and the mirror reinforcing material 1 is fixed to the ground 101 via the consolidated material. By applying the steps of placing the mirror reinforcing material 1, adjusting the arrangement of the mirror reinforcing material 1 with respect to the natural ground 101, and injecting the solidified material to the required location, the initial displacement allowable section 10 a is formed inside the natural ground 101. Then, the reinforcing section 10b is formed, and the initial allowable displacement area and the reinforcing area are formed by the parallel allowable displacement section 10a and the reinforcing section 10b, and the mirror reinforcing structure of this embodiment is constructed.

本実施形態によれば、強拘束部3の管継手7及びケーシングシュー8と、第2の弱拘束部4の先頭補強管6、中間補強管5が交互に配置されて両端部に強拘束部を備えて構成される当初の長い補強区間10b及び並行する補強区間10bで構成される当初の長い補強領域を鏡面102近傍よりも奥に配置し、この補強区間10b及び補強領域の強い拘束効果で地山を補強することにより、地山の崩壊挙動、周辺地山の塑性化の進展を確実に抑制することができる。特に、本実施形態では、固結材を鏡補強材1の外周の空隙に充填して鏡補強材1を地山101に定着させることで、鏡補強材1の地山101への定着と地山101に対する拘束をより確実に行うことができ、更に、補強区間10bの両端部分を強拘束部3とし、且つ固結材を介して両端の強拘束部3や中間に位置する強拘束部3の拘束力、付着力を分散して広げ、補強区間10b及び補強領域における鏡補強材1、固結材、地山101の定着状態の一体性を高めることができる。   According to the present embodiment, the pipe joint 7 and the casing shoe 8 of the strong restraint part 3 and the top reinforcing pipe 6 and the intermediate reinforcing pipe 5 of the second weak restraint part 4 are alternately arranged, and the strong restraint parts are provided at both ends. The initial long reinforcing area composed of the original long reinforcing section 10b and the parallel reinforcing section 10b is arranged behind the mirror surface 102, and the reinforcing section 10b and the reinforcing area have a strong restraining effect. By reinforcing the natural ground, it is possible to reliably suppress the collapse behavior of the natural ground and the progress of plasticization of the surrounding natural ground. In particular, in this embodiment, the mirror reinforcing material 1 is fixed to the ground 101 by filling the space around the outer periphery of the mirror reinforcing material 1 and fixing the mirror reinforcing material 1 to the ground 101. The mountain 101 can be restrained more reliably. Further, both ends of the reinforcing section 10b are the strong restraining portions 3, and the strong restraining portions 3 at both ends and the strong restraining portions 3 located in the middle through the binder. It is possible to disperse and widen the binding force and the adhesion force, and to enhance the integrity of the fixing state of the mirror reinforcing material 1, the consolidated material, and the ground 101 in the reinforcing section 10b and the reinforcing region.

また、鏡面102近傍に配置される拘束力が弱い第1の弱拘束部2の中間補強管5で構成される当初の変位許容区間10a及び並行する変位許容区間10aで構成される当初の変位許容領域が、鏡面102近傍の地山101を必要以上に拘束せずにある程度の地山変位を許容し、これにより、トンネル掘削時に急激な応力開放が生ずることを防止でき、支保104への作用応力を抑制することができる。従って、鏡補強工で鏡補強材1と周囲の地山101を適切に定着させ、周辺地山を安定させた状態でトンネル掘進を行うことが可能になると共に、補強後のトンネル掘進時に支保104にかかる負荷を小さくし、支保104の補強を不要にすることができる。   Further, the initial displacement permissible section 10a composed of the intermediate reinforcement pipe 5 of the first weak restraint portion 2 having a weak restraining force disposed near the mirror surface 102 and the initial displacement permissible section composed of the parallel displacement permissible section 10a. The region allows a certain amount of ground displacement without restraining the ground 101 near the mirror surface 102 more than necessary, thereby preventing a sudden stress release during tunnel excavation, and acting stress on the support 104 Can be suppressed. Accordingly, the mirror reinforcement material 1 and the surrounding natural ground 101 can be appropriately fixed by the mirror reinforcement work, and the tunnel excavation can be performed in a state where the peripheral natural ground is stabilized. Therefore, it is possible to reduce the load applied to the support 104 and make it unnecessary to reinforce the support 104.

また、鏡補強材1の打設後に、トンネル掘進の進行に伴い、強拘束部3のうち最後部に位置する強拘束部3に相当する管継手7の地山101への拘束力が弱まって不安定化し、その強拘束部3のすぐ前の第2の弱拘束部4に相当する中管補強管5が地山変位を許容する変位許容区間、変位許容領域として徐々に機能することになるので、新たな変位許容区間、変位許容領域と新たな補強区間、補強領域が形成され、支保設置区間毎等の掘削後において、本実施形態では打設した鏡補強材1の全長に亘るトンネル掘進において、周辺の地山101の安定化と支保104への負荷低減を図ることができる。   Further, after the placement of the mirror reinforcing material 1, as the tunnel excavation progresses, the restraining force of the pipe joint 7 corresponding to the strong restraining portion 3 located at the rearmost portion of the strong restraining portion 3 is weakened. The middle pipe reinforcement pipe 5 corresponding to the second weak restraint part 4 immediately before the strong restraint part 3 is destabilized and gradually functions as a displacement permissible section and a permissible displacement area for allowing ground displacement. Therefore, a new displacement permissible section, a displacement permissible area, a new reinforcement section, and a reinforcement area are formed. After excavation for each support installation section, etc., in this embodiment, tunnel excavation is performed over the entire length of the mirror reinforcement 1 placed. Therefore, it is possible to stabilize the surrounding natural ground 101 and reduce the load on the support 104.

また、ビットユニット9、ケーシングシュー8、先頭補強管6、中間補強管5、管継手7を用いて鏡補強材1の打設を行う削孔方式において、特別な部材を別途に用いる必要がなく、使用する各部材を必要なサイズや外形等に変更を加えるのみで、所要構成の鏡補強材1、鏡補強構造とすることができる。   Further, in the drilling method in which the mirror reinforcing material 1 is placed using the bit unit 9, the casing shoe 8, the leading reinforcing pipe 6, the intermediate reinforcing pipe 5, and the pipe joint 7, there is no need to use a special member separately. The mirror reinforcing material 1 and the mirror reinforcing structure having the required configuration can be obtained by only changing the necessary size and outer shape of each member to be used.

また、強拘束部3の管継手7、ケーシングシュー8の外径を、第1の弱拘束部2と第2の弱拘束部4を構成する中間補強管5、先頭補強管6よりも大径とすることにより、簡単な構成で、径の相違による段差で形状的な拘束が生じて拘束力が得られると共に、地山101との接触面積を増加させることにより、拘束力をより大きくすることができる。   Further, the outer diameters of the pipe joint 7 and the casing shoe 8 of the strong restraint portion 3 are larger than those of the intermediate reinforcement pipe 5 and the leading reinforcement pipe 6 constituting the first weak restraint portion 2 and the second weak restraint portion 4. By doing so, the restraint force is obtained by forming a shape restraint due to a step due to a difference in diameter, and the restraint force is obtained, and the contact force with the natural ground 101 is increased to increase the restraint force. Can do.

また、第1の弱拘束部2及び第2の弱拘束部4を構成する中間補強管5、先頭補強管6の外周面を平滑にすることで、地山101に対して拘束或いは付着が必要以上に過大になることを確実に防止できると共に、離間して設けられる強拘束部3の管継手7、ケーシングシュー8の外周面の凹凸の嵌め合いや表面積増加による拘束力、付着力の向上により、地山を強く拘束し、地山の崩壊挙動の抑制、周辺地山の塑性化の進展の抑制に必要な補強をより確実に行うことができる。   In addition, it is necessary to restrain or adhere to the ground 101 by smoothing the outer peripheral surfaces of the intermediate reinforcing pipe 5 and the top reinforcing pipe 6 constituting the first weakly restricting portion 2 and the second weakly restricting portion 4. It is possible to reliably prevent over-extension as well as to improve the binding force and adhesion by fitting the unevenness of the outer peripheral surface of the strong joint 3 and the outer surface of the casing shoe 8 and increasing the surface area. The ground is strongly restrained, and the reinforcement necessary for suppressing the collapse behavior of the ground and suppressing the progress of plasticization of the surrounding ground can be more reliably performed.

〔第2実施形態の鏡補強材、鏡補強構造及びその構築方法〕
本発明による第2実施形態の鏡補強材1mは、図9に示すように、第1実施形態と同様、トンネル掘削の鏡補強工で鏡面102から前方の地山101に打設される長尺の鏡補強材1mであり、鏡面102の近傍に配置される第1の弱拘束部2と、第1の弱拘束部2の前側に前方に向かって強弱の順で交互に配置される強拘束部3及び第2の弱拘束部4を備えている。長尺の鏡補強材1mの長さは、6m〜20m程度のものとすることが好ましい。
[Mirror Reinforcing Material, Mirror Reinforcing Structure and Construction Method of Second Embodiment]
As shown in FIG. 9, the mirror reinforcing member 1m of the second embodiment according to the present invention is a long piece that is driven from the mirror surface 102 to the front ground 101 by mirror excavation for tunnel excavation, as in the first embodiment. 1 m of the mirror reinforcing material, and the first weak restraint portion 2 arranged in the vicinity of the mirror surface 102 and the strong restraint alternately arranged in the order of strength toward the front side of the first weak restraint portion 2 A portion 3 and a second weak restraint portion 4 are provided. The length of the long mirror reinforcing material 1m is preferably about 6 to 20 m.

強拘束部3は、第1の弱拘束部2と第2の弱拘束部4のいずれよりも短尺で形成されていると共に、第1の弱拘束部2と第2の弱拘束部4のいずれよりも周囲の地山101への拘束力が大きくなるように形成されている。強拘束部3は3箇所以上の複数箇所設けられ、図示例では8箇所の強拘束部3が設けられている。   The strong restraint portion 3 is formed to be shorter than both the first weak restraint portion 2 and the second weak restraint portion 4, and any of the first weak restraint portion 2 and the second weak restraint portion 4 is used. It is formed so that the restraining force to the surrounding natural ground 101 becomes larger. The strong restraint portions 3 are provided at a plurality of places of three or more, and in the illustrated example, eight strong restraint portions 3 are provided.

第1の弱拘束部2と第2の弱拘束部4は、第1実施形態と同様の円筒状の補強管である中間補強管5の一部と先頭補強管6の一部で構成され、本例では中間補強管5の略中間位置と先頭補強管6の略中間位置及び先端部近傍の位置で外周に被覆された後述の被覆管13が設けられていない部分で構成されている。   The first weak restraint portion 2 and the second weak restraint portion 4 are configured by a part of the intermediate reinforcing pipe 5 and a part of the leading reinforcing pipe 6 which are the same cylindrical reinforcing pipes as in the first embodiment. In this example, the intermediate reinforcing pipe 5 is constituted by a portion where the outer pipe is not provided with a coating pipe 13 to be described later, which is covered at the substantially intermediate position of the intermediate reinforcing pipe 5, the intermediate position of the leading reinforcing pipe 6 and the position near the tip.

強拘束部3には、図9及び図10に示すように、補強管相互の接続、即ち中間補強管5・5相互の接続や、中間補強管5と先頭補強管6との接続を行う円筒状の管継手7で構成されるものと、中間補強管5、先頭補強管6の長手方向の所定位置の部分を外周に沿って被覆する被覆管13で構成されるものとがある。管継手7は第1実施形態と同様の構成であり、その外周面には島状に配列された突起71が形成され、凹凸が形成されている。   As shown in FIGS. 9 and 10, the strong restraint portion 3 includes a cylinder that connects the reinforcing pipes, that is, connects the intermediate reinforcing pipes 5 and 5 and connects the intermediate reinforcing pipe 5 and the top reinforcing pipe 6. There are a pipe-shaped pipe joint 7 and a pipe-shaped pipe joint 7 that covers the intermediate reinforcing pipe 5 and the leading reinforcing pipe 6 at predetermined positions in the longitudinal direction along the outer periphery. The pipe joint 7 has the same configuration as that of the first embodiment, and projections 71 arranged in an island shape are formed on the outer peripheral surface thereof to form irregularities.

被覆管13は円筒状であり、その内径が中間補強管5、先頭補強管6の外径に対応して形成されていると共に、その外周面には、細長形状で外側に突出し、略均等な繰り返しで島状に配列された突起131が形成されており、この突起131の形成箇所と形成されていない箇所で被覆管13の外周面に凹凸が形成されている。被覆管13は、中間補強管5、先頭補強管6の所定位置の部分の外周を被覆し、この所定位置の部分で溶接、接着、嵌着等で固定されて設けられる。本例の被覆管13は、中間補強管5の略中間位置と、先頭補強管6の略中間位置、先頭補強管6の先端部近傍の位置に設置され、当該箇所で強拘束部3を構成している。   The cladding tube 13 has a cylindrical shape, and the inner diameter thereof is formed corresponding to the outer diameter of the intermediate reinforcing pipe 5 and the leading reinforcing pipe 6. Protrusions 131 arranged in an island shape are formed repeatedly, and irregularities are formed on the outer peripheral surface of the cladding tube 13 at the positions where the protrusions 131 are formed and where they are not formed. The cladding tube 13 covers the outer periphery of the intermediate reinforcing tube 5 and the leading reinforcing tube 6 at predetermined positions, and is fixed by welding, bonding, fitting, or the like at the predetermined positions. The cladding tube 13 of this example is installed at a substantially intermediate position of the intermediate reinforcing tube 5, a substantially intermediate position of the leading reinforcing tube 6, and a position near the tip of the leading reinforcing tube 6. doing.

先頭補強管6の先端側の雄ねじ部62には、第1実施形態のケーシングシュー8と異なり、外周面が平滑面で形成されているケーシングシュー8mが螺合して取り付けられている。ケーシングシュー8mの前側部分には、ケーシングシュー8mの一部であるケーシングトップ8aを有し、ケーシングトップ8aを介してビットユニット9が設けられている。   Unlike the casing shoe 8 of the first embodiment, a casing shoe 8m whose outer peripheral surface is formed as a smooth surface is screwed onto the male threaded portion 62 on the distal end side of the top reinforcing pipe 6. The front portion of the casing shoe 8m has a casing top 8a that is a part of the casing shoe 8m, and a bit unit 9 is provided via the casing top 8a.

そして、鏡面102の近傍に中間補強管5を配置するようにして、鏡補強材1mを鏡面102から前方の地山101に打設すると共に、鏡補強材1mの内部に固結材を注入し、中間補強管5、先頭補強管6の注入孔53、63から固結材を鏡補強材1mの外周にある空隙に充填して、鏡補強材1mを地山101に定着させることにより、本実施形態の鏡補強構造が構築されている。図9中、10aは鏡面102の近傍の地山101に形成される鏡補強構造の当初の変位許容区間、10bは変位許容区間の前方の地山101に形成される鏡補強構造の当初の補強区間であり、本例の変位許容区間10aは鏡面102近傍から最後部の中間補強管5の一部、即ち最後部の中間補強管5の略中間位置を被覆している被覆管13に到達する前までの区間であり、それよりも前側で先頭補強管6の先端部近傍位置の先端被覆管に相当する被覆管13までが補強区間になっている。   Then, the intermediate reinforcing pipe 5 is disposed in the vicinity of the mirror surface 102, and the mirror reinforcing material 1m is placed on the ground 101 in front of the mirror surface 102, and a caking material is injected into the mirror reinforcing material 1m. The solid reinforcing material 1m is fixed to the ground 101 by filling the gap in the outer periphery of the mirror reinforcing material 1m from the injection holes 53 and 63 of the intermediate reinforcing pipe 5 and the leading reinforcing pipe 6 The mirror reinforcing structure of the embodiment is constructed. In FIG. 9, 10a is an initial displacement permissible section of the mirror reinforcement structure formed on the ground 101 near the mirror surface 102, and 10b is an initial reinforcement of the mirror reinforcement structure formed on the ground 101 in front of the displacement permissible section. The displacement allowable section 10a of this example reaches from the vicinity of the mirror surface 102 to the cladding tube 13 covering a part of the rearmost intermediate reinforcing tube 5, that is, the substantially intermediate position of the rearmost intermediate reinforcing tube 5. This is the section up to the front, and the cladding tube 13 corresponding to the distal end cladding tube in the vicinity of the distal end portion of the leading reinforcing tube 6 on the front side is the reinforcement segment.

第2実施形態の鏡補強構造を構築する際には、被覆管13が所定位置の部分に固定されている先頭補強管6、中間補強管5を用い、基本的に第1実施形態と同様に施工して構築することが可能である。   When constructing the mirror reinforcing structure of the second embodiment, the top reinforcing tube 6 and the intermediate reinforcing tube 5 in which the cladding tube 13 is fixed at a predetermined position are used, and basically the same as in the first embodiment. It is possible to construct and construct.

尚、変形例として、最前部に位置する強拘束部3を、先端被覆管に相当する被覆管13にする構成に代え、第1実施形態のように先頭補強管6の先端部に接続されるケーシングシュー8を最前部の強拘束部3にする構成、或いは先頭補強管6とケーシングシューとを管継手で接続する場合には管継手の外周面に突起を設ける構成等で、この先端管継手に相当する管継手を強拘束部3にする構成とすることが可能である。また、この先端管継手を強拘束部3とする構成を、第1実施形態でケーシングシュー8に代えて適用することも可能である。また、強拘束部を構成しない外周面が平滑な管継手を用い、この管継手で補強管相互を接続する構成とし、強拘束部3或いは最前部以外の強拘束部3を被覆管13だけで構成することも可能である。   As a modification, the strong restraint portion 3 positioned at the foremost part is connected to the distal end portion of the top reinforcing tube 6 as in the first embodiment instead of the configuration of the cladding tube 13 corresponding to the distal end cladding tube. This tip pipe joint has a configuration in which the casing shoe 8 is the foremost strong restraint part 3 or a structure in which a protrusion is provided on the outer peripheral surface of the pipe joint when the leading reinforcing pipe 6 and the casing shoe are connected by a pipe joint. It is possible to make it the structure which makes the pipe joint corresponded to the strong restraint part 3. FIG. Moreover, it is also possible to apply the configuration in which the distal end pipe joint is the strong restraint portion 3 in place of the casing shoe 8 in the first embodiment. In addition, a pipe joint having a smooth outer peripheral surface that does not constitute a strong restraint part is used, and the reinforcing pipes are connected to each other by this pipe joint. The strong restraint part 3 or the strong restraint part 3 other than the frontmost part is formed only by the cladding tube 13. It is also possible to configure.

第2実施形態によれば、第1実施形態と対応する構成から対応する効果が得られると共に、被覆管13によって任意の位置、任意の数の強拘束部3を容易且つ柔軟に形成することができ、地質条件に合わせた補強と変位許容の区間・領域を柔軟に形成することができる。また、必要に応じて、強拘束部3を構成するための加工コストがかかる管継手7やその接続作業を無くす或いは減少させることが可能となり、加工コストの低減、現場作業効率の向上を図ることができる。   According to the second embodiment, a corresponding effect can be obtained from the configuration corresponding to the first embodiment, and an arbitrary position and an arbitrary number of strong restraint portions 3 can be easily and flexibly formed by the cladding tube 13. It is possible to flexibly form sections and areas that are reinforced and allow displacement according to geological conditions. Further, if necessary, it is possible to eliminate or reduce the pipe joint 7 and its connecting work which require a processing cost for configuring the strong restraint portion 3, thereby reducing the processing cost and improving the work efficiency at the site. Can do.

特に、地山が変位を生じ易い地質の場合、強拘束部3の設置間隔を短くする必要があるため、管継手7だけで強拘束部3を形成する場合には補強管を短めにして管継手7を多く設置することになり、コストのかかる継手加工が増えたり、現場での接続作業が増えることになる。しかし、補強管の中間部に設ける被覆管13で構成される強拘束部3と、管継手7で構成される強拘束部3とを交互に設ける構成、或いは被覆管13で一つの補強管上に複数の短い強拘束部3を形成する構成により、長めの補強管を用い、高コストの管継手7の使用数を無くす或いは減少させることができる。そして、コスト削減と、接続作業減少による現場作業の効率化を両立させ、変位が生じ易い地山の地質に合わせた補強と変位許容の区間・領域を形成することができる。   In particular, when the ground is geologically prone to displacement, it is necessary to shorten the installation interval between the strong restraint portions 3. Therefore, when the strong restraint portion 3 is formed only by the pipe joint 7, the reinforcement pipe is shortened and the pipe is shortened. A large number of joints 7 will be installed, which will increase the cost of joint processing and increase the connection work on site. However, a configuration in which the strong restraint portion 3 composed of the cladding tube 13 provided in the middle portion of the reinforcing tube and the strong restraint portion 3 composed of the pipe joint 7 are alternately provided, or the cladding tube 13 has one reinforcing tube By using a structure in which a plurality of short strong restraint portions 3 are formed, a long reinforcing pipe can be used, and the number of high-cost pipe joints 7 used can be eliminated or reduced. Further, it is possible to achieve both cost reduction and efficiency of field work by reducing connection work, and it is possible to form a section and region where displacement and displacement are allowed according to the geology of the natural ground where displacement easily occurs.

また、最前部に位置する強拘束部を先端被覆管に相当する被覆管13、若しくはケーシングシュー、若しくはケーシングシューを接続する先端管継手とする場合には、鏡補強材1mの先端部の近傍に被覆材13を設ける簡単な構成で、若しくはビットユニット、ケーシングシュー、補強管、管継手を用いて鏡補強材の打設を行う削孔方式において、特別な部材を別途に用いない単純な構成で、鏡補強材1mの先端部若しくはその近傍に最前部の強拘束部3が構成され、最後部の強拘束部3から鏡補強材1mの先端近傍までの略全体に補強区間・領域を形成することができ、るため、低コストで確実に補強、変位許容の区間・領域を形成することができるとともに、打設した鏡補強材1mの全長に亘るトンネル掘進において周辺地山の安定化と支保104への負荷低減を図ることができる。また、ケーシングシュー若しくはケーシングシューを接続する先端管継手で強拘束部3を構成する場合には、元々使用するケーシングシューや先端管継手を有効利用して強拘束部3を構成することができる。   Further, when the strong restraint portion located at the foremost portion is a cladding tube 13 corresponding to the tip cladding tube, or a casing shoe, or a tip pipe joint connecting the casing shoe, it is in the vicinity of the tip portion of the mirror reinforcing material 1m. In a simple configuration in which the covering material 13 is provided, or in a drilling method in which a mirror reinforcing material is cast using a bit unit, a casing shoe, a reinforcing pipe, and a pipe joint, a simple configuration in which no special member is used. The foremost strong restraint portion 3 is formed at or near the front end of the mirror reinforcing material 1m, and a reinforcing section / region is formed in substantially the entire area from the last strong restraining portion 3 to the vicinity of the front end of the mirror reinforcing material 1m. Therefore, it is possible to reliably form a section and a region where displacement and tolerance are allowed at low cost, and to stabilize the surrounding natural ground in tunnel excavation over the entire length of the mirror reinforcing material 1m. It is possible to reduce the burden to the coercive 104. Moreover, when the strong restraint part 3 is comprised with the casing shoe or the tip pipe joint which connects a casing shoe, the strong restraint part 3 can be comprised effectively using the casing shoe and tip pipe joint which are originally used.

〔実施形態の変形例等〕
本明細書開示の発明は、各発明、実施形態、各例の他に、適用可能な範囲で、これらの部分的な構成を本明細書開示の他の構成に変更して特定したもの、或いはこれらの構成に本明細書開示の他の構成を付加して特定したもの、或いはこれらの部分的な構成を部分的な作用効果が得られる限度で削除して特定した上位概念化したものを含むものであり、下記変形例も包含する。
[Modifications of Embodiment, etc.]
The invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification, in addition to the respective inventions, embodiments, and examples, to the extent applicable. Those that are specified by adding other configurations disclosed in this specification to these configurations, or those that have been identified by deleting these partial configurations to the extent that partial effects can be obtained and specifying them The following modifications are also included.

例えば上記第1実施形態では、強拘束部3を構成する管継手7、ケーシングシュー8の突起81の外径を第1の弱拘束部2、第2の弱拘束部4の外径よりも大径とし、且つ管継手7の外周面、ケーシングシュー8の外周面に突起71、81による凹凸形状を有するものとしたが、例えばケーシングシュー8の外周面を突起81を設けずに平滑にし、先頭補強管6よりも大径等にしたケーシングシュー8で強拘束部3を構成するようにしてもよい。また、第2実施形態において、ケーシングシュー8mを先頭補強管6よりも大径にして最前部の強拘束部3を構成するようにしてもよい。また、ケーシングシュー8、8mの後側部分或いは前側部分など一部に凹凸形成したり、一部を大径にして強拘束部を構成させる他、ケーシングシュー8、8mの長さ方向の全体に亘って凹凸形成する或いは大径にすることでケーシングシューにより強拘束部を構成させることも可能であり、又、ケーシングシュー8、8mの長さ方向の全体における一部に凹凸形成をし別の一部を大径にして強拘束部を構成させることも可能である。   For example, in the first embodiment, the outer diameters of the projections 81 of the pipe joint 7 and the casing shoe 8 constituting the strong restraint portion 3 are larger than the outer diameters of the first weak restraint portion 2 and the second weak restraint portion 4. The diameter and the outer peripheral surface of the pipe joint 7 and the outer peripheral surface of the casing shoe 8 have irregularities formed by the protrusions 71 and 81. For example, the outer peripheral surface of the casing shoe 8 is smoothed without providing the protrusion 81, and the top You may make it comprise the strong restraint part 3 with the casing shoe 8 made larger diameter than the reinforcement pipe | tube 6. Further, in the second embodiment, the foremost strong restraint portion 3 may be configured with the casing shoe 8m having a diameter larger than that of the top reinforcing pipe 6. In addition, the rear portion or the front portion of the casing shoe 8, 8m is partially uneven, or a part of the casing shoe 8 has a large diameter to form a strong restraint portion. It is possible to form a strong constraining portion with a casing shoe by forming an unevenness over the entire surface or making it large in diameter, and forming an unevenness in a part of the entire length of the casing shoes 8 and 8m. It is also possible to configure a strongly constrained part with a large diameter.

また、強拘束部3は、第1の弱拘束部2と第2の弱拘束部4のいずれよりも周囲の地山101へ大きい拘束力が生ずる構成であれば本発明に包含され、例えば第1の弱拘束部2と第2の弱拘束部4のいずれよりも大径で且つ凹凸を有しない強拘束部とする構成、又は、第1の弱拘束部2と第2の弱拘束部4と同径若しくはこれらよりも小径で凹凸を有する強拘束部とする構成、又は、場所に応じて大径且つ凹凸を有しない強拘束部と、同径若しくは小径で凹凸を有する強拘束部を組み合わせる構成等とすることも可能である。   In addition, the strong restraint portion 3 is included in the present invention as long as it is configured to generate a greater restraining force on the surrounding natural ground 101 than both the first weak restraint portion 2 and the second weak restraint portion 4. 1st weak restraint part 2 and 2nd weak restraint part 4 The structure used as a strong restraint part which is larger than any of 1 weak restraint part 2 and 2nd weak restraint part 4, or does not have an unevenness | corrugation, or 1st weak restraint part 2 and 2nd weak restraint part 4 The structure is a strong constraining part having irregularities with the same diameter or smaller than these, or a strong constraining part having a large diameter and no irregularities depending on the location, and a strong constraining part having irregularities with the same diameter or a small diameter. A configuration or the like is also possible.

また、上記実施形態の中間補強管5、先頭補強管6は、必要な強度、管継手7による接続回数の作業性、地山101に対して必要な定着等の観点から、例えば鋼製で肉厚が4〜6mm程度、長さが2〜4m程度の仕様とすると好適であるが、中間補強管5、先頭補強管6の素材、肉厚、長さ等の仕様は、地山101の地質や施工条件等に応じて適宜のものを用いることが可能である。   In addition, the intermediate reinforcing pipe 5 and the top reinforcing pipe 6 of the above embodiment are made of, for example, steel and meat from the viewpoint of necessary strength, workability of the number of times of connection by the pipe joint 7, and necessary fixing to the ground 101. Although it is preferable that the thickness is about 4 to 6 mm and the length is about 2 to 4 m, the specifications such as the material, thickness, and length of the intermediate reinforcement pipe 5 and the top reinforcement pipe 6 are the geology of the natural ground 101. It is possible to use an appropriate one according to the construction conditions and the like.

また、強拘束部3は、3m毎など2〜4m程度毎に設けると好ましく、又、強拘束部3を管継手7で構成する場合の管継手7は、例えば鋼製で肉厚が2〜2.5mm程度、長さが0.1〜0.2m程度の仕様とし、強拘束部3を被覆管13で構成する場合の被覆管13は、例えば鋼製で肉厚が2〜2.5mm程度の仕様とすると好適であるが、これらも地山101の地質や施工条件等に応じて適宜変更することが可能である。   Further, it is preferable that the strong restraint portion 3 is provided every 2 to 4 m, such as every 3 m, and the pipe joint 7 when the strong restraint portion 3 is constituted by the pipe joint 7 is made of, for example, steel and has a thickness of 2 to 2. The specification is about 2.5 mm, the length is about 0.1 to 0.2 m, and the cladding 13 in the case where the strong restraint portion 3 is constituted by the cladding 13 is made of, for example, steel and has a thickness of 2 to 2.5 mm. Although it is suitable if it is set as a specification of a grade, these can also be suitably changed according to the geology, construction conditions, etc. of the natural ground 101.

また、上記実施形態の突起71、81、131は、例えば高さ1〜2.5mm、並列する突起71・71相互間のピッチ、突起81・81相互間のピッチ或いは突起131・131間のピッチを15〜25mm程度等で設けると良好であるが、これらのピッチや高さも地山101の地質や施工条件等に応じて適宜変更することが可能であり、又、これらの突起には、螺旋状の突起若しくは蛇腹状の突起等の適宜形状とすることが可能であるが、平面視楕円形、円形、十字形、L字形等で点状に配置され略均等間隔で配列される突起とすると、多数の凹凸が形成され、より強い拘束力或いは付着力が得られるので好ましい。   Further, the protrusions 71, 81, 131 in the above embodiment are, for example, 1 to 2.5 mm in height, the pitch between the parallel protrusions 71, 71, the pitch between the protrusions 81, 81, or the pitch between the protrusions 131, 131. However, the pitch and height can be appropriately changed according to the geology, construction conditions, etc. of the natural ground 101. It is possible to use an appropriate shape such as a protrusion or a bellows-like protrusion, but it is assumed that the protrusions are arranged in the shape of dots in a plan view oval shape, circular shape, cross shape, L shape, etc. and arranged at substantially equal intervals. A large number of irregularities are formed, and a stronger restraining force or adhesion force is obtained, which is preferable.

また、上記実施形態では固結材を用いる鏡補強構造について説明したが、本発明の鏡補強材或いは鏡補強構造には、固結材を用いない構成も包含される。   Moreover, although the said embodiment demonstrated the mirror reinforcement structure using a caking material, the structure which does not use a caking material is also included by the mirror reinforcement material or mirror reinforcement structure of this invention.

本発明は、トンネル掘削で施工する鏡補強工に利用することができる。   INDUSTRIAL APPLICABILITY The present invention can be used for mirror reinforcement work constructed by tunnel excavation.

1、1m…鏡補強材 2…第1の弱拘束部 3…強拘束部 4…第2の弱拘束部 5…中間補強管 51…本体 52…雄ねじ部 53…注入孔 54…切除溝 6…先頭補強管 61…本体 62…雄ねじ部 63…注入孔 64…切除溝 7…管継手 71…突起 8、8m…ケーシングシュー 81…突起 8a…ケーシングトップ 9…ビットユニット 91…胴部 92…ビットカッター部 10a…変位許容区間、10b…補強区間 11…ドリルジャンボ 111…ロッド 12…注入ホース 121…逆止弁 122
…パッカー 13…被覆管 131…突起 101…地山 102…鏡面 103、105…吹付コンクリート 104…支保
DESCRIPTION OF SYMBOLS 1, 1m ... Mirror reinforcement 2 ... 1st weak restraint part 3 ... Strong restraint part 4 ... 2nd weak restraint part 5 ... Intermediate reinforcement pipe 51 ... Main body 52 ... Male screw part 53 ... Injection hole 54 ... Cutting groove 6 ... Lead reinforcing pipe 61 ... Main body 62 ... Male thread part 63 ... Injection hole 64 ... Cutting groove 7 ... Pipe joint 71 ... Projection 8, 8m ... Casing shoe 81 ... Projection 8a ... Casing top 9 ... Bit unit 91 ... Body 92 ... Bit cutter Part 10a ... Allowable displacement section, 10b ... Reinforcement section 11 ... Drill jumbo 111 ... Rod 12 ... Injection hose 121 ... Check valve 122
... Packer 13 ... Clad tube 131 ... Protrusion 101 ... Mt.

Claims (2)

鏡面から前方地山に長尺の鏡補強材が打設され、前記鏡補強材が、前記鏡面の近傍に配置される第1の弱拘束部と、前記第1の弱拘束部の前側に前方に向かって強弱の順で交互に配置される強拘束部及び第2の弱拘束部とを備え、 前記強拘束部を3箇所以上備え、前記強拘束部が、前記第1の弱拘束部と前記第2の弱拘束部のいずれよりも短尺で形成されていると共に、前記第1の弱拘束部と前記第2の弱拘束部のいずれよりも周囲の地山への拘束力が大きくなるように形成され、 管状の前記第1の弱拘束部及び前記第2の弱拘束部に間隔を開けて形成された注入孔から、前記鏡補強材の内部に注入された固結材を前記鏡補強材の外周の空隙に充填して、前記鏡補強材が地山に定着されている鏡補強構造の構築方法であって、
ビットユニットに、前記第2の弱拘束部を構成する外周面に間隔を開けて注入孔が形成された先頭補強管をケーシングシューを介して接続して、鏡面から前方地山に打設する第1工程と、
前記強拘束部を構成する管継手を介して、前記第2の弱拘束部を構成する外周面に間隔を開けて注入孔が形成された中間補強管を接続して、鏡面から前方地山に打設する第2工程と、
打設した前記中間補強管に後続する前記中間補強管を前記管継手を介して接続して、鏡面から前方地山に打設し、必要に応じて後続する前記中間補強管の前記管継手を介しての接続と打設を繰り返し、鏡面近傍に最後尾の前記中間補強管を配置する第3工程と、
前記ビットユニットに動力を伝達するロッドを抜き出し、前記先頭補強管及び前記中間補強管の内部に固結材を注入し、前記先頭補強管の注入孔及び前記中間補強管の注入孔から前記鏡補強材の外周にある空隙に固結材を充填して前記鏡補強材を地山に定着させる第4工程と
を備えることを特徴とする鏡補強構造の構築方法。
A long mirror reinforcing material is placed from the mirror surface to the front ground, and the mirror reinforcing material is disposed in front of the first weak restraining portion and the first weak restraining portion disposed in the vicinity of the mirror surface. A strong restraint portion and a second weak restraint portion that are alternately arranged in the order of strength and weakness, comprising three or more strong restraint portions, wherein the strong restraint portion and the first weak restraint portion It is formed shorter than any of the second weak restraint portions, and the restraint force on the surrounding ground is greater than any of the first weak restraint portions and the second weak restraint portions. The solidified material injected into the mirror reinforcing material from the injection hole formed at intervals in the tubular first weak restricting portion and the second weak restricting portion is formed into the mirror reinforcing material. A method for constructing a mirror reinforcing structure in which a space around the outer periphery of the material is filled and the mirror reinforcing material is fixed to a natural ground,
A first reinforcing pipe having an injection hole formed at an interval on the outer peripheral surface constituting the second weakly restraining portion is connected to the bit unit via a casing shoe, and is placed on the front ground from the mirror surface. 1 process,
An intermediate reinforcement pipe having an injection hole formed at a distance from the outer peripheral surface constituting the second weak restraint portion is connected via a pipe joint constituting the strong restraint portion, from the mirror surface to the front ground. A second step of placing;
The intermediate reinforcement pipe that follows the intermediate reinforcement pipe that has been placed is connected via the pipe joint, and is cast from the mirror surface to the front ground, and if necessary, the pipe joint of the intermediate reinforcement pipe that follows is attached. Through the third step of repeating the connection and placement through, and placing the last intermediate reinforcing pipe near the mirror surface;
A rod for transmitting power to the bit unit is extracted, and a solidified material is injected into the front reinforcing pipe and the intermediate reinforcing pipe, and the mirror reinforcement is injected from the injection hole of the front reinforcing pipe and the injection hole of the intermediate reinforcing pipe. And a fourth step of fixing the mirror reinforcing material to a natural ground by filling a void in the outer periphery of the material with a caking material.
前記第1の弱拘束部、前記第2の弱拘束部、前記強拘束部がそれぞれ鋼製であり、The first weak restraint portion, the second weak restraint portion, and the strong restraint portion are each made of steel,
前記第1の弱拘束部及び前記第2の弱拘束部の外周面が平滑に形成されていると共に、前記強拘束部の外周面に凹凸が形成されていることを特徴とする請求項1記載の鏡補強構造の構築方法。2. The outer peripheral surfaces of the first weakly restraining portion and the second weakly restraining portion are formed smoothly, and unevenness is formed on the outer peripheral surface of the strong restraining portion. To build a mirror reinforcement structure.
JP2015056801A 2015-03-19 2015-03-19 Construction method of mirror reinforcement structure Active JP6497999B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015056801A JP6497999B2 (en) 2015-03-19 2015-03-19 Construction method of mirror reinforcement structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015056801A JP6497999B2 (en) 2015-03-19 2015-03-19 Construction method of mirror reinforcement structure

Publications (2)

Publication Number Publication Date
JP2016176238A JP2016176238A (en) 2016-10-06
JP6497999B2 true JP6497999B2 (en) 2019-04-10

Family

ID=57068955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015056801A Active JP6497999B2 (en) 2015-03-19 2015-03-19 Construction method of mirror reinforcement structure

Country Status (1)

Country Link
JP (1) JP6497999B2 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5927830B2 (en) * 1976-11-19 1984-07-09 日本鉱機株式会社 Tunnel excavation method in soft ground
US4666336A (en) * 1985-09-26 1987-05-19 Okumura Corporation Method of and apparatus for building thin lining on tunnel
JP2003106085A (en) * 2001-09-28 2003-04-09 Tonnel Kobo:Kk Bamboo reinforcing member for stabilizing excavated surface of tunnel
JP4942211B2 (en) * 2008-01-21 2012-05-30 鹿島建設株式会社 Ground reinforcement method
JP2011202460A (en) * 2010-03-26 2011-10-13 Shin Sanko Kokan:Kk Forepoling steel pipe for long forepoling method
JP5542531B2 (en) * 2010-06-09 2014-07-09 東海旅客鉄道株式会社 Ground improvement method and underpass method
JP2012158969A (en) * 2011-02-01 2012-08-23 Doro Kensetsu Consultant:Kk Natural ground reinforcing steel pipe
JP2013113080A (en) * 2011-11-24 2013-06-10 Takashi Tsuji Steel pipe for natural ground reinforcement

Also Published As

Publication number Publication date
JP2016176238A (en) 2016-10-06

Similar Documents

Publication Publication Date Title
EP3382143B1 (en) Tunnel construction method using pre-support and post-support and apparatus suitable for same
EP1959057A2 (en) Equipment and method for constructing micropiles in soil, in particular for the anchorage of active anchors
JP6395524B2 (en) Steel pipe for ground reinforcement and method for manufacturing the same
KR100937237B1 (en) Multiple soil-nailing ground reinforcement apparatus and multiple soil-nailing method
JP6872231B2 (en) Reinforcement structure of rock slope with long-term durability and its construction method
JP7165347B2 (en) Excavation method using pre-received steel pipes for tunnel construction
JP6232743B2 (en) Tunnel construction method and tunnel
JP5965778B2 (en) Long mirror bolt method
JP2009197573A (en) Natural ground reinforcing construction method
JP2788953B2 (en) Structure of tunnel structure
JP6359320B2 (en) Casing segment connection structure in the micropile method
JP6497999B2 (en) Construction method of mirror reinforcement structure
KR20130029906A (en) An expanding device of frictional force
KR101079075B1 (en) Reinforce Unit For Grouting And Grouting Reinforce Method Using The Same
JP2019056213A (en) Tunnel construction method
JP2012158969A (en) Natural ground reinforcing steel pipe
JP2007170038A (en) Natural ground reinforcing body and construction method of natural ground reinforcing body
JP6220602B2 (en) Ground anchor and ground anchor method
JP7178861B2 (en) Concrete wall reinforcement method
JP6071127B2 (en) Coupling structure of natural ground reinforcement pipe, coupler and natural ground reinforcement pipe
KR100869369B1 (en) The ground reinforcement apparatus and method grouting type using bundle steel pipe
JP6290986B2 (en) Open shield method using concrete box with flexible joint
JP3634820B2 (en) Curing material filling mold and curing material filling method
JP6820694B2 (en) Construction method of buried pipe and burial aid for buried pipe used in the construction method
KR102576665B1 (en) Leakage prevention structure and leak prevention construction method of structure

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20180119

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20180920

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20180927

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20181004

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20190312

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20190312

R150 Certificate of patent or registration of utility model

Ref document number: 6497999

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150