JP7092288B2 - Structural reinforcement method - Google Patents

Structural reinforcement method Download PDF

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JP7092288B2
JP7092288B2 JP2018193162A JP2018193162A JP7092288B2 JP 7092288 B2 JP7092288 B2 JP 7092288B2 JP 2018193162 A JP2018193162 A JP 2018193162A JP 2018193162 A JP2018193162 A JP 2018193162A JP 7092288 B2 JP7092288 B2 JP 7092288B2
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hole
support portion
insertion hole
diameter
steel rod
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JP2019078159A (en
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将平 吉川
裕 北嶋
ハッサン ウサレム
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Takenaka Corp
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0237—Increasing or restoring the load-bearing capacity of building construction elements of storey floors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/0018—Drills for enlarging a hole
    • B23B51/0045—Drills for enlarging a hole by expanding or tilting the toolhead
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0203—Arrangements for filling cracks or cavities in building constructions
    • E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0229—Increasing or restoring the load-bearing capacity of building construction elements of foundations or foundation walls
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/024—Increasing or restoring the load-bearing capacity of building construction elements of basement floors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/08—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front with separate or non-separate gripping parts moved into their final position in relation to the body of the device without further manual operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/10—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front with separate gripping parts moved into their final position in relation to the body of the device by a separate operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
    • F16B13/141—Fixing plugs in holes by the use of settable material

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Description

本発明は、構造物の補強工法に関する。 The present invention relates to a method for reinforcing a structure.

構造物の補強工法として、例えば、特許文献１に開示された補強工法が知られている。 As a reinforcing method for a structure, for example, a reinforcing method disclosed in Patent Document 1 is known.

特開２０１０－２８１０３３号公報Japanese Unexamined Patent Publication No. 2010-281333

この補強工法では、基礎部の周辺の地盤に穴を掘って、基礎部の側壁を露出させ、その後、基礎部の側壁から面外方向に横穴を形成している。そして、組積造壁の上端から横穴へ達する貫通孔を形成して該貫通孔に緊張材を挿入し、該緊張材の下端部に下部固定部を取り付けた後に、横穴に充填材を充填し、該緊張材の基礎部への固定を行なっている。
このように、緊張材の固定端の形成には、基礎側面を露出させる必要があるため、基礎側面の土の掘削、復旧と、これに付随する既存建物内部の解体、復旧などの仮設作業が必須であり、これら一連の施工が手間となっており、改善の余地があった。 In this reinforcement method, a hole is dug in the ground around the foundation to expose the side wall of the foundation, and then a lateral hole is formed from the side wall of the foundation in the out-of-plane direction. Then, a through hole extending from the upper end of the masonry wall to the lateral hole is formed, a tension material is inserted into the through hole, a lower fixing portion is attached to the lower end portion of the tension material, and then the lateral hole is filled with a filler. , The tension material is fixed to the base portion.
In this way, since it is necessary to expose the side surface of the foundation to form the fixed end of the tension material, the excavation and restoration of the soil on the side surface of the foundation and the accompanying temporary work such as dismantling and restoration of the inside of the existing building are required. It was indispensable, and these series of constructions were troublesome, and there was room for improvement.

本発明は上記事実を考慮し、施工の手間を低減可能な構造物の補強工法を提供することが目的である。 In consideration of the above facts, it is an object of the present invention to provide a method for reinforcing a structure that can reduce the labor of construction.

請求項１に記載の構造物の補強工法は、支持部で支持された構造物の前記支持部とは反対側の外面から前記支持部に向けて穿孔し、前記支持部の内部に孔底を有した挿入孔を形成する挿入孔形成工程と、前記挿入孔に棒材を挿入する棒材挿入工程と、前記挿入孔から前記支持部の前記挿入孔と前記棒材との間にのみ充填材を充填し、前記棒材を前記支持部に定着する定着工程と、前記棒材の前記構造物側の端部を前記構造物の外面に固定する固定工程と、を有する。 In the method for reinforcing a structure according to claim 1, a hole is formed in the structure supported by the support portion from an outer surface opposite to the support portion toward the support portion, and a hole bottom is formed inside the support portion. An insertion hole forming step for forming a possessed insertion hole, a bar material insertion step for inserting a bar material into the insertion hole, and a filler only between the insertion hole of the support portion and the bar material from the insertion hole. It has a fixing step of filling and fixing the bar to the support portion, and a fixing step of fixing the end portion of the bar on the structure side to the outer surface of the structure.

請求項１に記載の構造物の補強工法では、挿入孔形成工程において、支持部で支持された構造物の支持部とは反対側の外面から構造物を支持する支持部に向けて穿孔し、支持部の内部に孔底を有した挿入孔を形成する。
棒材挿入工程では、挿入孔に棒材を挿入する。
定着工程では、支持部の挿入孔と棒材との間にのみ充填材を充填し、棒材を支持部に定着する。
固定工程では、棒材の構造物側の端部を構造物の外面に固定する。
これらの工程を経ることで、構造物を貫通する棒材の一方の端部が支持部に定着され、他方の端部が構造物の外面に固定されて構造物が補強される。
請求項１に記載の構造物の補強工法によれば、支持部の側部に横穴を形成する必要がなく、該横穴の形成に付随する他の施工も不要となるので、施工の手間が低減される。 In the structure reinforcement method according to claim 1, in the insertion hole forming step, a hole is drilled from an outer surface opposite to the support portion of the structure supported by the support portion toward the support portion that supports the structure. An insertion hole having a hole bottom is formed inside the support portion.
In the bar material insertion step, the bar material is inserted into the insertion hole.
In the fixing step, the filler is filled only between the insertion hole of the support portion and the bar material, and the bar material is fixed to the support portion.
In the fixing step, the end portion of the bar on the structure side is fixed to the outer surface of the structure.
Through these steps, one end of the rod penetrating the structure is fixed to the support portion, and the other end is fixed to the outer surface of the structure to reinforce the structure.
According to the structural reinforcement method according to claim 1, it is not necessary to form a horizontal hole on the side portion of the support portion, and other construction accompanying the formation of the horizontal hole is not required, so that the labor of construction is reduced. Will be done.

請求項２に記載の発明は、請求項１に記載の構造物の補強工法において、前記構造物は、組積構造物であり、前記棒材を緊張させ、前記組積構造物に圧縮力を付与する緊張工程を有する。 The invention according to claim 2 is the structure reinforcing method according to claim 1, wherein the structure is a masonry structure, the bar member is tensioned, and a compressive force is applied to the masonry structure. Has a tensioning process to apply.

請求項２に記載の構造物の補強工法では、構造物が組積構造物とされている。
緊張工程では、棒材を緊張させ、組積構造物に圧縮力を付与する。
棒材を緊張させ、組積造構造物に圧縮力を付与することで、組積造構造物を構成するブロック状の部材と部材との間に大きな摩擦力を生じさせて目地強度（部材と部材との接着強度）を高めることができる。これにより、組積造構造物のせん断耐力の向上を図り、耐震性能を向上することができる。
請求項３に記載の発明は、請求項２に記載の構造物の補強工法において、前記組積構造物は、レンガ壁である。 In the structure reinforcement method according to claim 2, the structure is a masonry structure.
In the tensioning process, the bar is strained to apply compressive force to the masonry structure.
By tensioning the bar and applying a compressive force to the masonry structure, a large frictional force is generated between the block-shaped members constituting the masonry structure and the joint strength (with the member). (Adhesion strength with members) can be increased. As a result, the shear strength of the masonry structure can be improved and the seismic performance can be improved.
The invention according to claim 3 is the structure reinforcing method according to claim 2, wherein the masonry structure is a brick wall.

請求項４に記載の発明は、請求項１～請求項３の何れか１項に記載の構造物の補強工法において、前記支持部に形成された前記挿入孔の一部に拡径部を形成する拡径工程が、前記棒材挿入工程の前に行われる。 In the invention according to claim 4, in the structural reinforcement method according to any one of claims 1 to 3, a diameter-expanded portion is formed in a part of the insertion hole formed in the support portion. The diameter-expanding step is performed before the bar material inserting step.

請求項４に記載の構造物の補強工法では、棒材挿入工程の前に行われる拡径工程において、支持部に形成された挿入孔の一部に拡径部が形成される。
支持部に形成された挿入孔の一部に拡径部を形成することで、充填材が拡径部にも充填される。棒材に引き抜き方向の力が作用した際、拡径部に充填された充填材が、貫通孔の拡径部に引っ掛かるので、拡径部が形成されていない場合に比較して、棒材の引き抜き耐力を向上させることができる。 In the structural reinforcement method according to claim 4, the diameter-expanded portion is formed in a part of the insertion hole formed in the support portion in the diameter-expanding step performed before the bar material insertion step.
By forming the enlarged diameter portion in a part of the insertion hole formed in the support portion, the filler is also filled in the enlarged diameter portion. When a force in the pulling direction acts on the bar, the filler filled in the enlarged diameter portion is caught in the enlarged diameter portion of the through hole. The pull-out resistance can be improved.

請求項５に記載の発明は、請求項４に記載の構造物の補強工法において、前記拡径部は、前記支持部に形成された前記挿入孔の中間部に形成されており、前記拡径部の中間部、より好ましくは前記拡径部よりも奥側の前記挿入孔に挿入された前記棒材には、定着部材が取り付けられている。 The invention according to claim 5 is the method for reinforcing a structure according to claim 4 , wherein the enlarged diameter portion is formed in an intermediate portion of the insertion hole formed in the support portion, and the enlarged diameter portion is formed. A fixing member is attached to the middle portion of the portion, more preferably to the rod material inserted into the insertion hole on the back side of the enlarged diameter portion.

請求項５に記載の構造物の補強工法では、拡径部の中間部、より好ましくは拡径部よりも奥側の挿入孔に挿入された棒材には、定着部材が取り付けられているので、定着部材が無い場合に比較して、棒材の引き抜き耐力を更に向上させることができる。
請求項６に記載の発明は、請求項１～請求項５の何れか１項に記載の構造物の補強工法において、前記挿入孔は、前記構造物の上面から、前記構造物の下方に設けられた前記支持部に向けて穿孔されている。 In the structural reinforcement method according to claim 5, since the fixing member is attached to the rod material inserted into the intermediate portion of the enlarged diameter portion, more preferably the insertion hole on the back side of the enlarged diameter portion. , The pull-out resistance of the bar can be further improved as compared with the case where there is no fixing member.
The invention according to claim 6 is the method for reinforcing a structure according to any one of claims 1 to 5, wherein the insertion hole is provided below the structure from the upper surface of the structure. It is perforated toward the support portion.

以上説明したように本発明の構造物の補強工法によれば、施工の手間を低減することができる。 As described above, according to the structural reinforcement method of the present invention, it is possible to reduce the labor of construction.

本発明の一実施形態に係る孔拡径装置を示す側面図である。It is a side view which shows the hole diameter expansion apparatus which concerns on one Embodiment of this invention. （Ａ）は、円筒部材、上カバー、及び下カバーを取り外した孔拡径装置を示す正面図であり、（Ｂ）は、円筒部材２０の正面図であり、（Ｃ）は、上カバー５１の正面図であり、（Ｄ）は、下カバー１８Ｂの正面図である。(A) is a front view showing a hole diameter expanding device from which the cylindrical member, the upper cover, and the lower cover are removed, (B) is a front view of the cylindrical member 20, and (C) is an upper cover 51. It is a front view of the lower cover 18B, and (D) is a front view of the lower cover 18B. 円筒部材、上カバー、及び下カバーを取り外した孔拡径装置を示す側面図である。It is a side view which shows the hole diameter expansion device which removed the cylindrical member, the upper cover, and the lower cover. （Ａ）は、孔拡径装置の側面側から見た縦断面図であり、（Ｂ）は、図４（Ａ）に示す孔拡径装置の４（Ｂ）－４（Ｂ）線断面図であり、（Ｃ）は、図４（Ａ）に示す孔拡径装置の４（Ｃ）－４（Ｃ）線断面図であり、（Ｄ）は、図４（Ａ）に示す孔拡径装置の４（Ｄ）－４（Ｄ）線断面図であり、（Ｅ）は、図４（Ａ）に示す孔拡径装置の４（Ｅ）－４（Ｅ）線断面図であり、（Ｆ）は、図４（Ａ）に示す孔拡径装置の４（Ｆ）－４（Ｆ）線断面図である。(A) is a vertical sectional view seen from the side surface side of the hole expansion device, and (B) is a 4 (B) -4 (B) line sectional view of the hole expansion device shown in FIG. 4 (A). 4 (C) is a cross-sectional view taken along the line 4 (C) -4 (C) of the hole diameter expansion device shown in FIG. 4 (A), and FIG. 4 (D) is a hole diameter expansion device shown in FIG. 4 (A). 4 (D) -4 (D) line sectional view of the apparatus, (E) is a 4 (E) -4 (E) line sectional view of the hole diameter expansion apparatus shown in FIG. 4 (A), and ( F) is a cross-sectional view taken along the line 4 (F) -4 (F) of the hole diameter expanding device shown in FIG. 4 (A). 孔拡径装置の側面側から見た縦断面図である。It is a vertical sectional view seen from the side surface side of the hole diameter expansion device. 孔拡径装置の側面側から見た、縦断面の正面図である。It is a front view of the vertical cross section seen from the side surface side of the hole diameter expansion device. （Ａ）は、レンガ壁、及びコンクリート基礎にドリルを用いて孔を穿孔している様子を示す断面図であり、（Ｂ）は、孔に孔拡径装置を挿入してコンクリート基礎内の孔の一部を拡径している様子を示す断面図である。(A) is a cross-sectional view showing a state in which a hole is drilled in a brick wall and a concrete foundation using a drill, and (B) is a hole in the concrete foundation by inserting a hole diameter expansion device into the hole. It is sectional drawing which shows the state which the diameter is expanded a part of. （Ａ）は、孔拡径装置を抜いた後のレンガ壁、及びコンクリート基礎を示す断面図であり、（Ｂ）は、掘削孔に挿入するＰＣ鋼棒の先端部分を示す側面図であり、（Ｃ）は、掘削孔にＰＣ鋼棒を挿入しグラウド材を注入した様子を示すレンガ壁、及びコンクリート基礎を示す断面図であり、（Ｄ）は、ＰＣ鋼棒を挿入しグラウド材を注入した後の孔の先端付近を示す断面図である。(A) is a cross-sectional view showing a brick wall and a concrete foundation after removing the hole diameter expansion device, and (B) is a side view showing a tip portion of a PC steel rod to be inserted into a drilling hole. (C) is a cross-sectional view showing a brick wall showing a state in which a PC steel rod is inserted into a drilling hole and injected with a ground material, and (D) is a cross-sectional view showing a state in which a PC steel rod is inserted and the ground material is injected. It is sectional drawing which shows the vicinity of the tip of a hole after concrete formation. ＰＣ鋼棒に上部固定部材を取り付けた状態を示す断面図である。It is sectional drawing which shows the state which attached the upper fixing member to the PC steel rod. （Ａ）は、他の実施形態に係る定着部材を示す軸方向から見た平面図であり、（Ｂ）は、図１０（Ａ）に示す定着部材を示す軸線に沿った断面図である。(A) is a plan view showing the fixing member according to another embodiment seen from the axial direction, and (B) is a cross-sectional view along an axis showing the fixing member shown in FIG. 10 (A). （Ａ）は、他の実施形態に係る定着部材を示す軸方向から見た平面図であり、（Ｂ）は、図１１（Ａ）に示す定着部材を示す軸線に沿った断面図である。(A) is a plan view showing the fixing member according to another embodiment seen from the axial direction, and (B) is a cross-sectional view along an axis showing the fixing member shown in FIG. 11 (A). （Ａ）は、他の実施形態に係る定着部材を示す軸方向から見た平面図であり、（Ｂ）は、図１２（Ａ）に示す定着部材を示す軸線に沿った断面図である。(A) is a plan view showing the fixing member according to another embodiment seen from the axial direction, and (B) is a cross-sectional view along an axis showing the fixing member shown in FIG. 12 (A). （Ａ）は、他の実施形態に係る定着部材を示す軸方向から見た平面図であり、（Ｂ）は、図１３（Ａ）に示す定着部材を示す軸線に沿った断面図である。(A) is a plan view showing the fixing member according to another embodiment seen from the axial direction, and (B) is a cross-sectional view along an axis showing the fixing member shown in FIG. 13 (A). 他の実施形態に係る掘削孔の形状を示すコンクリート基礎の断面図である。It is sectional drawing of the concrete foundation which shows the shape of the excavation hole which concerns on other embodiment. （Ａ）、及び（Ｂ）は、他の実施形態に係る掘削孔の形状を示すコンクリート基礎の断面図である。(A) and (B) are sectional views of a concrete foundation showing the shape of the excavated hole according to another embodiment. （Ａ）、及び（Ｂ）は、他の実施形態に係る掘削孔の形状を示すコンクリート基礎の断面図である。(A) and (B) are sectional views of a concrete foundation showing the shape of the excavated hole according to another embodiment. （Ａ）、及び（Ｂ）は、他の実施形態に係る掘削孔の形状を示すコンクリート基礎の断面図である。(A) and (B) are sectional views of a concrete foundation showing the shape of the excavated hole according to another embodiment. （Ａ）は、他の実施形態に係る掘削孔の形状を示すコンクリート基礎の断面図であり、（Ｂ）は、掘削孔の形状を示すコンクリート基礎の拡大断面図である。(A) is a cross-sectional view of a concrete foundation showing the shape of the excavated hole according to another embodiment, and (B) is an enlarged cross-sectional view of the concrete foundation showing the shape of the excavated hole. （Ａ）は、試験体Ａを示す断面図である。(A) is a cross-sectional view showing a test piece A. 試験体ＡにおけるＰＣ鋼棒に付与した引張荷重とＰＣ鋼棒の変位との関係を示したグラフである。It is a graph which showed the relationship between the tensile load applied to the PC steel rod in the test body A, and the displacement of the PC steel rod.

図１～図８を用いて、本発明の一実施形態に係る孔拡径装置１０ついて説明する。
図１に示すように、孔拡径装置１０は、コアマシン１２（図１では図示せず。図７（Ｂ）参照）のチューブ状とされた掘削ロッド１４の先端に取り付けられる駆動部１６と、駆動部１６の掘削ロッド側とは反対側に設けられ、駆動部１６とは相対回転不能で、且つ軸方向には相対移動可能とされた支持部１８とを備えている。 A hole diameter expanding device 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8.
As shown in FIG. 1, the hole expansion device 10 includes a drive unit 16 attached to the tip of a tubular excavation rod 14 of a core machine 12 (not shown in FIG. 1, see FIG. 7B). A support portion 18 is provided on the side opposite to the excavation rod side of the drive unit 16 and is not rotatable relative to the drive unit 16 and is relatively movable in the axial direction.

（駆動部の構成）
図１、及び図２に示すように、駆動部１６は、鋼、ステンレススチール等の金属材料で形成された円筒部材２０を備えており、円筒部材２０の上端側の外周には、掘削ロッド１４の雌螺子２２に螺合する雄螺子２４が形成されている。円筒部材２０の外径は、図７（Ａ）に示すコアマシン１２のドリル１５で穿孔される掘削孔２８の内径よりも小さく形成されている。 (Structure of drive unit)
As shown in FIGS. 1 and 2, the drive unit 16 includes a cylindrical member 20 made of a metal material such as steel or stainless steel, and an excavation rod 14 is provided on the outer periphery of the upper end side of the cylindrical member 20. A male screw 24 to be screwed into the female screw 22 is formed. The outer diameter of the cylindrical member 20 is formed to be smaller than the inner diameter of the drill hole 28 drilled by the drill 15 of the core machine 12 shown in FIG. 7 (A).

図２～図５に示すように、円筒部材２０の内部には、軸方向の中間部分に鋼、ステンレススチール等の金属材料で形成されたリンク支持部材３０が配置されている。リンク支持部材３０は、上から順に大径部３２、小径部３６を備えると共に、中心には軸方向に貫通する段付きの孔３８が形成されている。リンク支持部材３０は、止め螺子４０を用いて円筒部材２０に固定されている。 As shown in FIGS. 2 to 5, inside the cylindrical member 20, a link support member 30 made of a metal material such as steel or stainless steel is arranged in an intermediate portion in the axial direction. The link support member 30 is provided with a large diameter portion 32 and a small diameter portion 36 in this order from the top, and a stepped hole 38 penetrating in the axial direction is formed in the center. The link support member 30 is fixed to the cylindrical member 20 by using a set screw 40.

図４（Ａ），（Ｃ）に示すように、リンク支持部材３０の小径部３６には、互いに平行とされた一対の平面部４２が形成されている。平面部４２には、雌螺子４４が形成されている。雌螺子４４の軸心は、リンク支持部材３０の軸心と直交している。 As shown in FIGS. 4A and 4C, a pair of flat surface portions 42 parallel to each other are formed on the small diameter portion 36 of the link support member 30. A female screw 44 is formed on the flat surface portion 42. The axis of the female screw 44 is orthogonal to the axis of the link support member 30.

図４（Ｃ）に示すように、雌螺子４４には、第１リンク支持軸４６が取り付けられている。第１リンク支持軸４６は、頭部４６Ａと、リンク支持軸部４６Ｂと、雌螺子４４に螺合する雄螺子４６Ｃを備えている。 As shown in FIG. 4C, a first link support shaft 46 is attached to the female screw 44. The first link support shaft 46 includes a head portion 46A, a link support shaft portion 46B, and a male screw 46C screwed into the female screw 44.

リンク支持軸部４６Ｂは、リンク４８の一端側の孔５０Ａに回転自在に挿入されており、リンク４８は、第１リンク支持軸４６を中心として揺動可能（図４（Ａ）の矢印Ａ方向）となっている。 The link support shaft portion 46B is rotatably inserted into the hole 50A on one end side of the link 48, and the link 48 can swing about the first link support shaft 46 (direction of arrow A in FIG. 4A). ).

図１、２、４に示すように、円筒部材２０の下端には、鋼、ステンレススチール等の金属材料で形成され、円筒部材２０の外径と同一外径とされた円筒状の上カバー５１が螺子（図示せず）で取付けられている。なお、上カバー５１の下端側には、後述する刃部６２を突出させるための細長の長方形状とされた切欠５１Ａが形成されている。 As shown in FIGS. 1, 2 and 4, a cylindrical upper cover 51 formed of a metal material such as steel or stainless steel at the lower end of the cylindrical member 20 and having the same outer diameter as the outer diameter of the cylindrical member 20. Is attached with a screw (not shown). A notch 51A having an elongated rectangular shape for projecting the blade portion 62, which will be described later, is formed on the lower end side of the upper cover 51.

（支持部の構成）
駆動部１６の下側に支持部１８が配置されている。支持部１８は、本体１８Ａと、本体１８Ａの外周側に配置される円筒状の下カバー１８Ｂを備えている。本体１８Ａは、刃部支持部１８Ａａと、刃部支持部１８Ａａの上側に一体的に形成された円筒部１８Ａｂを備えている。図４、及び図５に示すように、円筒部１８Ａｂは、駆動部１６の円筒部材２０の下側から円筒部材２０の内部に摺動自在に挿入されている。また、下カバー１８Ｂは、螺子１９で本体１８Ａの刃部支持部１８Ａａに固定されている。 (Structure of support part)
The support portion 18 is arranged below the drive portion 16. The support portion 18 includes a main body 18A and a cylindrical lower cover 18B arranged on the outer peripheral side of the main body 18A. The main body 18A includes a blade support portion 18Aa and a cylindrical portion 18Ab integrally formed on the upper side of the blade support portion 18Aa. As shown in FIGS. 4 and 5, the cylindrical portion 18Ab is slidably inserted into the inside of the cylindrical member 20 from the lower side of the cylindrical member 20 of the drive portion 16. Further, the lower cover 18B is fixed to the blade support portion 18Aa of the main body 18A by a screw 19.

図２、及び図４に示すように、円筒部１８Ａｂの外周面には軸方向に沿って延びる第１のキー溝５２が形成され、駆動部１６の円筒部材２０の内周面には軸方向に沿って延びる第２のキー溝５４が形成されており、支持部１８の第１のキー溝５２にキー５６が螺子５８で固定されている。なお、キー５６は、円筒部材２０の第２のキー溝５４に対してスライド自在に挿入されている。これにより、駆動部１６と支持部１８とは、相対回転不能で、且つ軸方向には相対移動可能とされている。 As shown in FIGS. 2 and 4, a first key groove 52 extending along the axial direction is formed on the outer peripheral surface of the cylindrical portion 18Ab, and the inner peripheral surface of the cylindrical member 20 of the drive portion 16 is axially oriented. A second key groove 54 extending along the line is formed, and the key 56 is fixed to the first key groove 52 of the support portion 18 with a screw 58. The key 56 is slidably inserted into the second key groove 54 of the cylindrical member 20. As a result, the drive unit 16 and the support unit 18 cannot rotate relative to each other and can move relative to each other in the axial direction.

図１、図２、及び図４に示すように、支持部１８の下端には、鋼、ステンレススチール等の金属材料で形成され、上カバー５１の外径と同一外径とされた円筒状の下カバー１８Ｂが取付けられている。下カバー１８Ｂには、後述する刃部６２を突出させるための細長の長方形状とされた窓部５３が形成されている。 As shown in FIGS. 1, 2, and 4, the lower end of the support portion 18 is formed of a metal material such as steel or stainless steel, and has a cylindrical shape having the same outer diameter as the outer diameter of the upper cover 51. The lower cover 18B is attached. The lower cover 18B is formed with an elongated rectangular window portion 53 for projecting the blade portion 62, which will be described later.

図４（Ａ）、及び図５に示すように、下カバー１８Ｂは、上側の一部分が上カバー５１の下端側から相対移動可能に挿入されており、上カバー５１の下側の一部分と下カバー１８Ｂの上側の一部分とが軸方向にオーバーラップしている。 As shown in FIGS. 4A and 5, the lower cover 18B is inserted so that the upper part of the lower cover 18B can be moved relative to the lower end side of the upper cover 51, and the lower part of the upper cover 51 and the lower cover are inserted. The upper part of 18B overlaps in the axial direction.

（刃部、及び刃部の駆動機構の構成）
図２、及び図４（Ｅ）に示すように、支持部１８の刃部支持部１８Ａａには、軸方向に沿って互いに平行に延びる一対の溝６０が、支持部１８の軸心を挟んで両側に形成されている。溝６０には、以下に説明する略扇状に形成された鋼、ステンレススチール等の金属板からなる刃部６２が摺動可能に挿入されている。なお、この溝６０の溝壁が、本発明の支持壁に相当している。 (Structure of blade and drive mechanism of blade)
As shown in FIGS. 2 and 4 (E), in the blade support portion 18Aa of the support portion 18, a pair of grooves 60 extending in parallel with each other along the axial direction sandwich the axial center of the support portion 18. It is formed on both sides. A blade portion 62 made of a metal plate such as steel or stainless steel, which is formed in a substantially fan shape and is described below, is slidably inserted into the groove 60. The groove wall of the groove 60 corresponds to the support wall of the present invention.

図４（Ａ）、図５、及び図６に示すように、刃部６２は、直線状に延びる第１辺６２Ａ、及び第２辺６２Ｂと、湾曲した湾曲部６２Ｃとを備え、第１辺６２Ａと第２辺６２Ｂとの交点付近に孔６４が形成され、第１辺６２Ａと湾曲部６２Ｃとの交点付近に雌螺子６６が形成されている。 As shown in FIGS. 4A, 5 and 6, the blade portion 62 includes a linearly extending first side 62A and a second side 62B, and a curved curved portion 62C, and has a first side. A hole 64 is formed near the intersection of the first side 62A and the second side 62B, and a female screw 66 is formed near the intersection of the first side 62A and the curved portion 62C.

支持部１８の一方の溝６０と他方の溝６０との間に設けられる支持壁６８には、刃部６２を揺動可能に支持するピン７０の軸部７０Ａが挿入される孔７２が一対形成されている。ピン７０には、軸部７０Ａの一端側に頭部７０Ｂが形成されている。一方、支持部１８には、孔７２の一端側に、ピン７０の頭部７０Ｂが挿入される座グリ７２Ａが形成されており、ピン７０の頭部７０Ｂが支持壁６８から突出して刃部６２に当たらないように、頭部７０Ｂが座グリ７２Ａに嵌り込んでいる。 The support wall 68 provided between one groove 60 of the support portion 18 and the other groove 60 has a pair of holes 72 into which the shaft portion 70A of the pin 70 that swingably supports the blade portion 62 is inserted. Has been done. A head 70B is formed on the pin 70 on one end side of the shaft portion 70A. On the other hand, in the support portion 18, a counterbore 72A into which the head 70B of the pin 70 is inserted is formed on one end side of the hole 72, and the head 70B of the pin 70 protrudes from the support wall 68 and the blade portion 62. The head 70B is fitted into the counterbore 72A so as not to hit the counterbore.

図４（Ｅ）に示すように、孔７２に挿入されたピン７０の軸部７０Ａは、刃部６２の孔６４を貫通しており、刃部６２を貫通した軸部７０Ａ先端側に止め輪７４が嵌められている。これにより、ピン７０は支持部１８に固定されている。図４（Ａ）、及び図６に示すように、刃部６２は、このピン７０を中心として矢印Ｂ方向に揺動可能に支持されている。なお、刃部６２が揺動する際には、刃部６２の側面が溝６０の両側の溝壁面に摺動する。 As shown in FIG. 4 (E), the shaft portion 70A of the pin 70 inserted into the hole 72 penetrates the hole 64 of the blade portion 62, and the retaining ring is on the tip end side of the shaft portion 70A penetrating the blade portion 62. 74 is fitted. As a result, the pin 70 is fixed to the support portion 18. As shown in FIGS. 4A and 6, the blade portion 62 is supported so as to be swingable in the direction of arrow B about the pin 70. When the blade portion 62 swings, the side surface of the blade portion 62 slides on the groove wall surfaces on both sides of the groove 60.

図４、及び図５に示すように、刃部６２の雌螺子６６には、第２リンク支持軸７６が取り付けられている。第２リンク支持軸７６は、頭部７６Ａと、リンク支持軸部７６Ｂと、雌螺子６６に螺合する雄螺子７６Ｃを備えている。第２リンク支持軸７６のリンク支持軸部７６Ｂは、リンク４８の他端側の孔５０Ｂに回転自在に挿入されている。これにより、リンク４８、及び刃部６２は、第２リンク支持軸７６を中心として揺動可能となっている。 As shown in FIGS. 4 and 5, a second link support shaft 76 is attached to the female screw 66 of the blade portion 62. The second link support shaft 76 includes a head portion 76A, a link support shaft portion 76B, and a male screw 76C screwed into the female screw 66. The link support shaft portion 76B of the second link support shaft 76 is rotatably inserted into the hole 50B on the other end side of the link 48. As a result, the link 48 and the blade portion 62 can swing around the second link support shaft 76.

なお、刃部６２の第２辺６２Ｂには、耐摩耗性に優れたダイヤモンド焼結体等からなる刃６３が固着されている。 A blade 63 made of a diamond sintered body or the like having excellent wear resistance is fixed to the second side 62B of the blade portion 62.

図４、及び図５に示すように、支持部１８には、円筒部１８Ａｂの内部にコイルバネ７８が配置されている。コイルバネ７８は、支持部１８と駆動部１６とを離間する方向に付勢している。また、支持部１８には、コイルバネ７８を軸心に保持するためのボルト７９が取り付けられている。図４（Ａ）は、孔拡径装置１０の通常時（初期状態）の断面が示されており、コイルバネ７８は伸張している。駆動部１６が支持部１８に接近すると、図６に示すようにコイルバネ７８は圧縮される。 As shown in FIGS. 4 and 5, the support portion 18 has a coil spring 78 arranged inside the cylindrical portion 18Ab. The coil spring 78 is urged in a direction in which the support portion 18 and the drive portion 16 are separated from each other. Further, a bolt 79 for holding the coil spring 78 at the axial center is attached to the support portion 18. FIG. 4A shows a cross section of the hole diameter expanding device 10 in a normal state (initial state), and the coil spring 78 is extended. When the drive unit 16 approaches the support unit 18, the coil spring 78 is compressed as shown in FIG.

図４（Ａ）に示すように、孔拡径装置１０が通常時の場合、刃部６２は支持部１８の内部に収容されおり、図６に示すように、駆動部１６が支持部１８に接近すると、刃部６２の第２リンク支持軸７６がリンク４８で押されて揺動し、刃６３が固着されている刃部６２の第２辺６２Ｂが、上カバー５１の切欠５１Ａ、及び下カバー１８Ｂの窓部５３（図２（Ｃ），（Ｄ）参照）を介して支持部１８の径方向外側へ突出する。なお、切欠５１Ａ、及び窓部５３の幅寸法は、刃部６２の幅（厚み）寸法よりも若干大きく形成されている。 As shown in FIG. 4A, when the hole expansion device 10 is in the normal state, the blade portion 62 is housed inside the support portion 18, and as shown in FIG. 6, the drive portion 16 is housed in the support portion 18. When approaching, the second link support shaft 76 of the blade portion 62 is pushed by the link 48 and swings, and the second side 62B of the blade portion 62 to which the blade portion 63 is fixed becomes the notch 51A of the upper cover 51 and the lower portion. It projects outward in the radial direction of the support portion 18 via the window portion 53 of the cover 18B (see FIGS. 2C and 2D). The width dimension of the notch 51A and the window portion 53 is formed to be slightly larger than the width (thickness) dimension of the blade portion 62.

（回転台）
図４に示すように、支持部１８の下端側には、回転台８０が回転自在に取り付けられている。回転台８０は、支持部１８の下端面に取り付けられる軸部材８２、支持脚８４、軸部材８２と支持脚８４とを回転自在に連結するボールベアリング８６、軸部材８２から支持脚８４が外れない様にするボルト８８、及び座金９０を備えている。軸部材８２は、ボルト９０で支持部１８の端面に固定される。 (Rotary table)
As shown in FIG. 4, a rotary table 80 is rotatably attached to the lower end side of the support portion 18. The turntable 80 has a shaft member 82 and a support leg 84 attached to the lower end surface of the support portion 18, a ball bearing 86 that rotatably connects the shaft member 82 and the support leg 84, and the support leg 84 does not come off from the shaft member 82. It is equipped with a bolt 88 and a bearing 90. The shaft member 82 is fixed to the end face of the support portion 18 with bolts 90.

（作用、効果）
次に、本実施形態の構造物の補強工法の一例について説明する。本実施形態では、既存の構造物である組積構造物としてのレンガ壁９４の補強を行う。組積構造物とは、石、レンガ、コンクリートブロック等のブロック状の部材を積み重ねて形成された構造物を意味する。レンガ壁９４は、レンガブロックを積み重ねて形成されている。 (Action, effect)
Next, an example of the structural reinforcement method of the present embodiment will be described. In the present embodiment, the brick wall 94 as a masonry structure, which is an existing structure, is reinforced. The masonry structure means a structure formed by stacking block-shaped members such as stones, bricks, and concrete blocks. The brick wall 94 is formed by stacking brick blocks.

（１）挿入孔形成工程： 図７（Ａ）に示すように、コアマシン１２のドリル１５でレンガ壁９４の上端外面から地中に埋設されてレンガ壁９４を支持する支持部としてのコンクリート基礎９６に向けて、レンガ壁９４及びコンクリート基礎９６に挿入孔としての掘削孔２８を穿孔する。このように、本実施形態の掘削孔２８は、コアマシン１２のドリル１５で穿孔されて形成された孔を意味し、この孔が、後に説明される棒材としてのＰＣ鋼棒９８が挿入される挿入孔となる。掘削孔２８は、コンクリート基礎９６の内部に孔底を有するように、コンクリート基礎９６を貫通しないように穿孔する。なお、この掘削孔２８は、コンクリート基礎９６を貫通しないことはもちろん、また、他の孔（図示せず）を介してコンクリート基礎９６の外部と連通しない。即ち、掘削孔２８は、レンガ壁９４の上面のみに開口している。
なお、掘削孔２８の穿孔中、及び穿孔後、掘削孔２８の内部の切削屑を集塵機等を用いて除去する。 (1) Insertion hole forming step: As shown in FIG. 7A, a concrete foundation 96 as a support portion buried in the ground from the outer surface of the upper end of the brick wall 94 by the drill 15 of the core machine 12 to support the brick wall 94. A drilling hole 28 is drilled in the brick wall 94 and the concrete foundation 96 as an insertion hole. As described above, the excavation hole 28 of the present embodiment means a hole formed by being drilled by the drill 15 of the core machine 12, and the PC steel rod 98 as a bar material described later is inserted into this hole. It becomes an insertion hole. The excavation hole 28 is drilled so as not to penetrate the concrete foundation 96 so as to have a hole bottom inside the concrete foundation 96. It should be noted that the excavation hole 28 does not penetrate the concrete foundation 96 and does not communicate with the outside of the concrete foundation 96 through another hole (not shown). That is, the excavation hole 28 is open only on the upper surface of the brick wall 94.
During and after the drilling of the drilling hole 28, the cutting debris inside the drilling hole 28 is removed by using a dust collector or the like.

（２）拡径工程：ドリル１５を掘削孔２８から引き抜いてコアマシン１２の掘削ロッド１４からドリル１５を外し、掘削ロッド１４の先端に孔拡径装置１０を取り付け、孔拡径装置１０の回転台８０が掘削孔２８の底部に突き当たるまで孔拡径装置１０を掘削孔２８の奥に挿入する。 (2) Diameter expansion step: The drill 15 is pulled out from the excavation hole 28, the drill 15 is removed from the excavation rod 14 of the core machine 12, the hole expansion device 10 is attached to the tip of the excavation rod 14, and the turntable of the hole expansion device 10 is attached. The hole expansion device 10 is inserted into the depth of the drill hole 28 until the 80 hits the bottom of the drill hole 28.

その後、掘削ロッド１４を回転させながら掘削ロッド１４を掘削孔２８の奥に向けて徐々に移動させる。掘削ロッド１４の移動に伴って駆動部１６が支持部１８側へ移動し、これに伴ってリンク４８が刃部６２の第２リンク支持軸７６を押圧し、図６、及び図７（Ｂ）に示すように刃部６２が支持部１８の外側に揺動して突出し、刃６３が掘削孔２８の内周面を切削し、掘削孔２８の一部が拡径される。これによって、図８（Ａ）に示すように、掘削孔２８の底部付近に拡径部２８Ａが形成される。すなわち、コンクリート基礎９６に形成された掘削孔２８の中間部に位置するこの掘削孔２８の一部に拡径部２８Ａが形成されている。ここで、孔拡径装置１０は、回転台８０が掘削孔２８の底部に接触して保持された状態で回転台８０よりも上側部分のみが回転する。また、掘削孔２８の内周面を切削している間に、図示しない吸引装置で掘削孔２８の中の切削屑を集塵機等を用いて除去する。 After that, the excavation rod 14 is gradually moved toward the back of the excavation hole 28 while rotating the excavation rod 14. Along with the movement of the excavation rod 14, the drive portion 16 moves toward the support portion 18, and the link 48 presses the second link support shaft 76 of the blade portion 62 accordingly, and FIGS. 6 and 7 (B) are used. As shown in the above, the blade portion 62 swings and protrudes to the outside of the support portion 18, the blade 63 cuts the inner peripheral surface of the excavation hole 28, and a part of the excavation hole 28 is enlarged in diameter. As a result, as shown in FIG. 8A, the enlarged diameter portion 28A is formed near the bottom of the excavation hole 28. That is, the enlarged diameter portion 28A is formed in a part of the excavation hole 28 located in the middle portion of the excavation hole 28 formed in the concrete foundation 96. Here, in the hole diameter expanding device 10, only the portion above the rotary table 80 rotates while the rotary table 80 is in contact with and held at the bottom of the excavation hole 28. Further, while cutting the inner peripheral surface of the excavation hole 28, the cutting debris in the excavation hole 28 is removed by a dust collector or the like with a suction device (not shown).

（３）棒材挿入工程：図８（Ｂ）に示すように、掘削孔２８に挿入する棒材としてのＰＣ鋼棒９８は、下端側に雄螺子９８Ａが加工され、上端側に雄螺子９８Ｂが加工されている。ＰＣ鋼棒９８の下端側には、定着部材１０２が雄螺子９８Ａに捩じ込まれて取り付けられている。なお、定着部材１０２の径は、掘削孔２８の内径よりも若干小径である。
この棒材挿入工程では、拡径工程の後に、定着部材１０２の取り付けられたＰＣ鋼棒９８が掘削孔２８に挿入され、ＰＣ鋼棒９８の下端がコンクリート基礎９６に形成された掘削孔２８の底部に突き当てられる。また、拡径部２８Ａよりも奥側（底側）の掘削孔２８に挿入されたＰＣ鋼棒９８に、定着部材１０２が取り付けられている。図９に示すように、ＰＣ鋼棒９８の上端側は、一部分（雄螺子９８Ｂの形成されている部分）がレンガ壁９４の上面よりも突出される。 (3) Bar material insertion step: As shown in FIG. 8B, the PC steel rod 98 as a bar material to be inserted into the excavation hole 28 has a male screw 98A machined on the lower end side and a male screw 98B on the upper end side. Is processed. A fixing member 102 is screwed into a male screw 98A and attached to the lower end side of the PC steel rod 98. The diameter of the fixing member 102 is slightly smaller than the inner diameter of the excavation hole 28.
In this bar material insertion step, after the diameter expansion step, the PC steel rod 98 to which the fixing member 102 is attached is inserted into the excavation hole 28, and the lower end of the PC steel rod 98 is formed in the concrete foundation 96. It is struck at the bottom. Further, the fixing member 102 is attached to the PC steel rod 98 inserted into the excavation hole 28 on the back side (bottom side) of the enlarged diameter portion 28A. As shown in FIG. 9, a part (the part where the male screw 98B is formed) of the upper end side of the PC steel rod 98 protrudes from the upper surface of the brick wall 94.

（４）定着工程、固定工程、及び緊張工程：コンクリート基礎９６に形成された掘削孔２８の内部にグラウト材１０４を注入し、コンクリート基礎９６に形成された掘削孔２８とＰＣ鋼棒９８の端部との間にグラウト材１０４を充填する。 (4) Fixing step, fixing step, and tensioning step: The grout material 104 is injected into the drilling hole 28 formed in the concrete foundation 96, and the drilling hole 28 and the end of the PC steel rod 98 formed in the concrete foundation 96. The grout material 104 is filled between the portions.

グラウト材１０４の注入後、レンガ壁９４の上面に上部固定部材１０６を配置する。上部固定部材１０６は、一例として、レンガ壁９４の長手方向に沿って長尺状に形成された帯状の鋼板、Ｈ形鋼、Ｌ字鋼、溝型鋼等の種々の形鋼を用いることができる。なお、図８（Ｃ）、及び図９には、上部固定部材１０６として、帯状の鋼板（一例として平鋼）を用いた例が示されている。 After injecting the grout material 104, the upper fixing member 106 is arranged on the upper surface of the brick wall 94. As the upper fixing member 106, as an example, various shaped steels such as strip-shaped steel plates, H-shaped steels, L-shaped steels, channel steels and the like formed in a long shape along the longitudinal direction of the brick wall 94 can be used. .. 8 (C) and 9 show an example in which a strip-shaped steel plate (as an example, flat steel) is used as the upper fixing member 106.

図９に示すように、上部固定部材１０６には、ＰＣ鋼棒９８を貫通する孔１０８が形成されており、この孔にＰＣ鋼棒９８の上端側を貫通させる。
グラウト材１０４を掘削孔２８とＰＣ鋼棒９８の端部との間に注入して充填した後、グラウト材１０４が固化するまで放置する。グラウト材１０４が固化することで、ＰＣ鋼棒９８がコンクリート基礎９６に定着（固着）される（定着工程）。 As shown in FIG. 9, the upper fixing member 106 is formed with a hole 108 that penetrates the PC steel rod 98, and the upper end side of the PC steel rod 98 is penetrated through this hole.
The grout material 104 is injected and filled between the drilling hole 28 and the end of the PC steel rod 98, and then left to stand until the grout material 104 solidifies. By solidifying the grout material 104, the PC steel rod 98 is fixed (fixed) to the concrete foundation 96 (fixing step).

グラウト材１０４が固化した後、ＰＣ鋼棒９８に緊張力を付与し、所定の緊張力が導入されたのち、ＰＣ鋼棒９８の上端に形成された雄螺子９８Ｂにナット１１０を螺合し、工具を用いてナット１１０を締め付ける（固定工程、緊張工程）。ナット１１０を締め付けることで、ＰＣ鋼棒９８は、上端部（レンガ壁９４側の端部）がレンガ壁９４の上端外面に固定されるとともに、ナット１１０とコンクリート基礎９６に定着された下端側との間で緊張力が保持される。すなわち、コンクリート基礎９６と上部固定部材１０６とでレンガ壁９４が上下方向に挟持されてレンガ壁９４に圧縮力が付与される。 After the grout material 104 is solidified, a tension force is applied to the PC steel rod 98, a predetermined tension force is introduced, and then the nut 110 is screwed into the male screw 98B formed at the upper end of the PC steel rod 98. Tighten the nut 110 with a tool (fixing process, tensioning process). By tightening the nut 110, the upper end (the end on the brick wall 94 side) of the PC steel rod 98 is fixed to the outer surface of the upper end of the brick wall 94, and the nut 110 and the lower end side fixed to the concrete foundation 96 are fixed. Tension is maintained between. That is, the brick wall 94 is sandwiched vertically between the concrete foundation 96 and the upper fixing member 106, and a compressive force is applied to the brick wall 94.

本実施形態の構造物の補強工法によれば、上記の工程を経ることでレンガ壁９４が上下方向に挟持されて圧縮され、レンガとレンガとの間の目地強度（レンガとレンガとの接着強度）が高まることでせん断耐力が向上し、レンガ壁９４の耐震性能を向上させることができる。 According to the structural reinforcement method of the present embodiment, the brick wall 94 is sandwiched and compressed in the vertical direction by going through the above steps, and the joint strength between the bricks (the adhesive strength between the bricks and the bricks). ) Is increased, the shear strength is improved, and the seismic performance of the brick wall 94 can be improved.

従来工法によれば、ＰＣ鋼棒の下端側を固定する際に、コンクリート基礎の側面を露出させる必要があり、基礎側面の土の掘削、復旧等の一連の施工が手間となっていたが、本実施形態の構造物の補強工法では、基礎側面の土の掘削、復旧が必要なく、従来工法に比較して、施工の手間を大幅に低減することができる。 According to the conventional method, when fixing the lower end side of the PC steel rod, it is necessary to expose the side surface of the concrete foundation, and a series of construction such as excavation and restoration of soil on the side surface of the foundation has been troublesome. The structural reinforcement method of the present embodiment does not require excavation and restoration of soil on the side surface of the foundation, and can significantly reduce the labor of construction as compared with the conventional method.

なお、拡径部２８Ａよりも奥側の掘削孔２８に挿入されたＰＣ鋼棒９８には、定着部材１０２が取り付けられているので、定着部材１０２が無い場合に比較して、ＰＣ鋼棒９８の引き抜き耐力を向上させることができる。 Since the fixing member 102 is attached to the PC steel rod 98 inserted into the excavation hole 28 on the back side of the enlarged diameter portion 28A, the PC steel rod 98 is compared with the case where the fixing member 102 is not provided. It is possible to improve the pull-out resistance of the.

また、コンクリート基礎９６に形成された掘削孔２８の中で固化したグラウト材１０４は、掘削孔２８の拡径した拡径部２８Ａの内部に充填されているので、ＰＣ鋼棒９８に引き抜き方向の力が作用した際に、グラウト材１０４の拡径した部分１０４Ａ（拡径部２８Ａに充填された部分）が掘削孔２８の拡径部２８Ａに引っ掛かっているので、拡径部２８Ａが無い場合に比較して、ＰＣ鋼棒９８の引き抜き耐力を向上させることができる。 Further, since the grout material 104 solidified in the drilling hole 28 formed in the concrete foundation 96 is filled inside the expanded diameter portion 28A of the drilling hole 28, the PC steel rod 98 is pulled out in the drawing direction. When the force is applied, the enlarged diameter portion 104A (the portion filled in the enlarged diameter portion 28A) of the grout material 104 is caught in the enlarged diameter portion 28A of the drilling hole 28, so that when there is no enlarged diameter portion 28A. In comparison, the pull-out resistance of the PC steel rod 98 can be improved.

次に、本実施形態の孔拡径装置１０の作用、効果について説明する。
本実施形態の孔拡径装置１０では、掘削孔２８の拡径時に、突出した刃部６２が掘削孔２８の孔壁から反力を受けるが、この反力は刃部６２と対面して設けられた支持壁としての溝６０の溝壁で両側から挟まれるように支持されるため、刃部６２の振動（びびり）を抑制することができる。また、硬い孔壁であっても、刃部６２の変形や破損を抑制することができ、刃部６２の耐久性を向上させることができる。 Next, the operation and effect of the hole diameter expanding device 10 of the present embodiment will be described.
In the hole diameter expanding device 10 of the present embodiment, when the diameter of the drilling hole 28 is expanded, the protruding blade portion 62 receives a reaction force from the hole wall of the drilling hole 28, and this reaction force is provided facing the blade portion 62. Since it is supported so as to be sandwiched from both sides by the groove wall of the groove 60 as the supported support wall, vibration (chatter) of the blade portion 62 can be suppressed. Further, even if the hole wall is hard, deformation or breakage of the blade portion 62 can be suppressed, and the durability of the blade portion 62 can be improved.

本実施形態の孔拡径装置１０では、２枚の刃部６２で掘削孔２８を切削するので、１枚の刃部６２で切削する場合に比較して作業効率を向上させることができる。 In the hole diameter expanding device 10 of the present embodiment, since the excavation hole 28 is cut by the two blade portions 62, the work efficiency can be improved as compared with the case of cutting by one blade portion 62.

本実施形態の孔拡径装置１０では、刃部６２の刃先が上方から下方へ揺動して収容位置から突出位置へ移動する機構と比較して、孔拡径装置１０を掘削孔２８から引き抜くとき、刃部６２が拡径部２８Ａに引っ掛からずに、収容位置へ収容されやすい。 In the hole diameter expanding device 10 of the present embodiment, the hole diameter expanding device 10 is pulled out from the excavation hole 28 as compared with a mechanism in which the cutting edge of the blade portion 62 swings downward from above and moves from the accommodation position to the protruding position. At this time, the blade portion 62 is easily accommodated in the accommodating position without being caught by the enlarged diameter portion 28A.

本実施形態の孔拡径装置１０では、掘削孔２８の側壁を切削している際に回転台８０が回転しないので、掘削孔２８の底部が切削されることはなく、掘削孔２８の深さが変更されない。 In the hole diameter expanding device 10 of the present embodiment, since the rotary table 80 does not rotate when cutting the side wall of the excavation hole 28, the bottom of the excavation hole 28 is not cut and the depth of the excavation hole 28 is deep. Is not changed.

本実施形態の孔拡径装置１０では、支持部１８が下カバー１８Ｂで覆われているので（但し、刃部６２の出入する最小限の大きさに形成された窓部としての窓部５３を除く）、支持部１８の内側に切削屑が入り難くなっている。なお、刃部６２が支持部１８の内部に収容されている状態では、図１、及び図４（Ａ）に示すように、窓部５３の略全体が刃部６２の第２辺６２Ｂで塞がれるので、窓部５３からも切削屑が入り難くなっている。 In the hole diameter expanding device 10 of the present embodiment, since the support portion 18 is covered with the lower cover 18B (however, the window portion 53 as a window portion formed to the minimum size for the blade portion 62 to enter and exit is provided. (Excluding), it is difficult for cutting chips to enter the inside of the support portion 18. In the state where the blade portion 62 is housed inside the support portion 18, substantially the entire window portion 53 is closed by the second side 62B of the blade portion 62, as shown in FIGS. 1 and 4A. Since it is peeled off, it is difficult for cutting chips to enter from the window portion 53 as well.

また、孔拡径装置１０は、掘削ロッド１４を介して孔拡径装置１０の内部に空気を供給することができる。供給された空気は、孔３８を介して支持部１８の内部に送られて下カバー１８Ｂの窓部５３から噴出する。これにより、掘削孔２８の底部付近の切削屑が吸引し易くなる。 Further, the hole expansion device 10 can supply air to the inside of the hole expansion device 10 via the excavation rod 14. The supplied air is sent to the inside of the support portion 18 through the hole 38 and is ejected from the window portion 53 of the lower cover 18B. This facilitates suction of cutting chips near the bottom of the excavation hole 28.

［その他の実施形態］
以上、本発明の一実施形態について説明したが、本発明は、上記に限定されるものでなく、上記以外にも、その主旨を逸脱しない範囲内において種々変形して実施可能であることは勿論である。 [Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that the present invention can be variously modified and implemented without departing from the gist thereof. Is.

上記実施形態では、グラウト材１０４をコンクリート基礎９６に形成された掘削孔２８の内部のみに充填したが、コンクリート基礎９６に形成された掘削孔２８の内部と共に、レンガ壁９４に形成された掘削孔２８の内部に充填してもよい。 In the above embodiment, the grout material 104 is filled only in the inside of the excavation hole 28 formed in the concrete foundation 96, but the excavation hole formed in the brick wall 94 together with the inside of the excavation hole 28 formed in the concrete foundation 96. The inside of 28 may be filled.

上記実施形態では、本発明の定着部材としての定着部材１０２が、図８（Ｂ）に示す形状であったが、定着部材１０２の形状は、図１０に示すような円柱状、図１１に示すフランジ１０２Ａの形成された円柱状、図１２に示す円錐台形状、図１３に示す六角柱状等、平座金状以外の他の形状であってもよく、ＰＣ鋼棒９８よりも大径であればよい。なお、図１０～１３に示す定着部材１０２は、ＰＣ鋼棒９８の雄螺子９８Ａと螺合させるための雌螺子１１２が形成されている。また、定着部材１０２は、ＰＣ鋼棒９８に溶接等の他の方法で固着してもよい。 In the above embodiment, the fixing member 102 as the fixing member of the present invention has the shape shown in FIG. 8B, but the shape of the fixing member 102 is a columnar shape as shown in FIG. 10, and is shown in FIG. The columnar shape of the flange 102A, the conical column shape shown in FIG. 12, the hexagonal columnar shape shown in FIG. 13, and the like may be any shape other than the flat washer shape, as long as the diameter is larger than that of the PC steel rod 98. good. The fixing member 102 shown in FIGS. 10 to 13 is formed with a female screw 112 for screwing with the male screw 98A of the PC steel rod 98. Further, the fixing member 102 may be fixed to the PC steel rod 98 by another method such as welding.

コンクリート基礎９６の掘削孔２８に形成される拡径部２８Ａの断面形状は、図８（Ａ）に示す形状に限らず、図１４～１７に示す形状（半扇形、矩形、三角形、半楕円形）であってもよく、また、一つの掘削孔２８に対して複数の拡径部２８Ａを形成してもよい。 The cross-sectional shape of the enlarged diameter portion 28A formed in the drilling hole 28 of the concrete foundation 96 is not limited to the shape shown in FIG. 8 (A), but the shapes shown in FIGS. ), Or a plurality of enlarged diameter portions 28A may be formed for one drilling hole 28.

上記実施形態では、既存のレンガ壁９４の補強を行なったが、本発明の構造物の補強工法の対象は、レンガ壁９４に限らず、石造、ブロック造等の他の組積構造物補強、石積み擁壁など空積み擁壁の構造補強、ＲＣ擁壁の構造補強、既存ＲＣ構造物の構造補強等に適用でき、支持部に支持されて配置された種々の構造物に対して補強を行うことができる。したがって、本発明の構造物の補強工法は、支持部に支持されて配置された、さまざまな構造物に適用することができる。 In the above embodiment, the existing brick wall 94 is reinforced, but the target of the structural reinforcement method of the present invention is not limited to the brick wall 94, but other masonry structures such as stone and block structures can be reinforced. It can be applied to structural reinforcement of empty retaining walls such as masonry retaining walls, structural reinforcement of RC retaining walls, structural reinforcement of existing RC structures, etc., and reinforces various structures supported by support parts. be able to. Therefore, the structural reinforcement method of the present invention can be applied to various structures supported and arranged by the support portion.

上記実施形態では、掘削孔を鉛直方向に形成した例を説明したが、掘削孔の方向は鉛直方向に限らず、鉛直方向に対して傾斜する方向、水平方向等であってもよい。 In the above embodiment, an example in which the drilling hole is formed in the vertical direction has been described, but the direction of the drilling hole is not limited to the vertical direction, and may be a direction inclined with respect to the vertical direction, a horizontal direction, or the like.

上記実施形態のように、定着部材１０２は、拡径部２８Ａよりも奥側（下側）の掘削孔２８に挿入されたＰＣ鋼棒９８に取り付けられていることが好ましいが、定着部材１０２は、拡径部２８Ａの中間部に位置するＰＣ鋼棒９８、または拡径部２８Ａよりも上側に位置するＰＣ鋼棒９８に取り付けられていてもよい。 As in the above embodiment, it is preferable that the fixing member 102 is attached to the PC steel rod 98 inserted into the excavation hole 28 on the back side (lower side) of the enlarged diameter portion 28A, but the fixing member 102 is , The PC steel rod 98 located in the middle portion of the enlarged diameter portion 28A, or the PC steel rod 98 located above the enlarged diameter portion 28A may be attached.

上記実施形態では、ＰＣ鋼棒（棒材）９８に定着部材１０２を取り付けたが、本発明はこれに限らず、ＰＣ鋼棒９８の引き抜き耐力が確保されるのであれば、定着部材１０２を取り付けなくてもよい。なお、ＰＣ鋼棒９８に定着部材１０２を取り付ける代わりに、ＰＣ鋼棒９８の外周面を凹凸状に変形させてもよい。 In the above embodiment, the fixing member 102 is attached to the PC steel rod (bar material) 98, but the present invention is not limited to this, and if the pull-out strength of the PC steel rod 98 is secured, the fixing member 102 is attached. It does not have to be. Instead of attaching the fixing member 102 to the PC steel rod 98, the outer peripheral surface of the PC steel rod 98 may be deformed into an uneven shape.

上記実施形態では、掘削孔２８に拡径部２８Ａを形成したが、本発明はこれに限らず、ＰＣ鋼棒（棒材）９８の引き抜き耐力が確保されるのであれば、図１８（Ａ），（Ｂ）に示すように、掘削孔２８に拡径部２８Ａを形成しなくてもよい。 In the above embodiment, the enlarged diameter portion 28A is formed in the excavation hole 28, but the present invention is not limited to this, and if the pull-out strength of the PC steel rod (bar material) 98 is secured, FIG. 18A is shown. , (B), it is not necessary to form the enlarged diameter portion 28A in the excavation hole 28.

上記実施形態では、棒材としてＰＣ鋼棒９８を用いたが、本発明はこれに限らず、棒材は、鉄筋等のＰＣ鋼棒以外のものであってもよく、棒材の材質は鋼以外のものであってもよい。 In the above embodiment, the PC steel rod 98 is used as the rod material, but the present invention is not limited to this, and the rod material may be other than the PC steel rod such as a reinforcing bar, and the material of the rod material is steel. It may be something other than.

上記実施形態では、コアマシン１２のドリル１５で穿孔して形成された掘削孔２８を挿入孔とした例を示したが、挿入孔は、棒材としてのＰＣ鋼棒９８が挿入できるものであれば、どのような方法で形成された孔であってもよい。 In the above embodiment, an example is shown in which the drilling hole 28 formed by drilling with the drill 15 of the core machine 12 is used as the insertion hole, but the insertion hole is as long as the PC steel rod 98 as a bar can be inserted. , The hole may be formed by any method.

（試験例）
ＰＣ鋼棒の引張耐力について試験した結果を以下に示す。
図１９に示すように、グラウト材１０４をコンクリート基礎９６の上面まで充填した試験体Ａを試作し、引張試験機にてＰＣ鋼棒９８に張力を付与し、試験体Ａの状態を観察した。ＰＣ鋼棒９８への張力の付与は、コンクリート基礎９６上面に設置された反力鉄板１２０に支持されるように、この反力鉄板１２０上に設置された引張試験機によって、ＰＣ鋼棒９８を緊張することにより行った。 (Test example)
The results of testing the tensile strength of PC steel rods are shown below.
As shown in FIG. 19, a test piece A in which the grout material 104 was filled up to the upper surface of the concrete foundation 96 was prototyped, tension was applied to the PC steel rod 98 with a tensile tester, and the state of the test piece A was observed. The tension tester installed on the reaction force iron plate 120 supports the tension applied to the PC steel rod 98 by the reaction force iron plate 120 installed on the upper surface of the concrete foundation 96. I went by being nervous.

以下に試験体Ａの詳細な構造を説明する。
・試験体Ａ
図１９に示すように、コンクリート基礎９６に、中間部に直径１０８ｍｍの拡径部２８Ａを設けた直径５４ｍｍ、深さ２７５ｍｍの掘削孔２８を形成し、この掘削孔２８に直径５０ｍｍの定着部材１０２を取り付けた直径２６ｍｍのＰＣ鋼棒９８を挿入した後、グラウト材１０４を掘削孔２８の内部にコンクリート基礎９６の上面まで充填した。なお、拡径部２８Ａは、コンクリート基礎９６の上端から深さＬ１１０８～Ｌ２１５０ｍｍの範囲に形成されている。 The detailed structure of the test piece A will be described below.
・ Test piece A
As shown in FIG. 19, a drilling hole 28 having a diameter of 54 mm and a depth of 275 mm is formed in the concrete foundation 96 with an enlarged diameter portion 28A having a diameter of 108 mm in the middle portion, and a fixing member 102 having a diameter of 50 mm is formed in the drilled hole 28. After inserting the PC steel rod 98 having a diameter of 26 mm, the grout material 104 was filled inside the drilling hole 28 up to the upper surface of the concrete foundation 96. The enlarged diameter portion 28A is formed in a depth range of L 1 108 to L 2 150 mm from the upper end of the concrete foundation 96.

図２０は、試験体ＡにおけるＰＣ鋼棒に付与した引張荷重とＰＣ鋼棒の変位との関係を示したグラフである。
試験の結果、試験体Ａでは、ＰＣ鋼棒９８が上方に変位するものの、ＰＣ鋼棒９８の降伏耐力限界までＰＣ鋼棒９８が引き抜かれないことが分かった。 FIG. 20 is a graph showing the relationship between the tensile load applied to the PC steel rod in the test piece A and the displacement of the PC steel rod.
As a result of the test, it was found that in the test piece A, the PC steel rod 98 was displaced upward, but the PC steel rod 98 was not pulled out to the yield strength limit of the PC steel rod 98.

２８ 掘削孔（挿入孔）
２８Ａ 拡径部
９４ レンガ壁（組積構造物、構造物）
９６ コンクリート基礎（支持部）
９８ ＰＣ鋼棒（棒材）
１０２ 定着部材
１０４ グラウト材（充填材） 28 Drilling hole (insertion hole)
28A Enlarged diameter part 94 Brick wall (masonry structure, structure)
96 Concrete foundation (support part)
98 PC steel rod (bar material)
102 Fixing member 104 Grout material (filler)

Claims (6)

支持部で支持された構造物の前記支持部とは反対側の外面から前記支持部に向けて穿孔し、前記支持部の内部に孔底を有した挿入孔を形成する挿入孔形成工程と、
前記挿入孔に棒材を挿入する棒材挿入工程と、
前記挿入孔から前記支持部の前記挿入孔と前記棒材との間にのみ充填材を充填し、前記棒材を前記支持部に定着する定着工程と、
前記棒材の前記構造物側の端部を前記構造物の外面に固定する固定工程と、
を有する構造物の補強工法。 An insertion hole forming step of forming an insertion hole having a hole bottom inside the support portion by drilling toward the support portion from an outer surface of a structure supported by the support portion on the opposite side of the support portion.
The bar material insertion step of inserting the bar material into the insertion hole, and
A fixing step of filling the filler only between the insertion hole of the support portion and the bar material from the insertion hole and fixing the bar material to the support portion.
A fixing step of fixing the end portion of the bar material on the structure side to the outer surface of the structure,
Reinforcement method for structures with. 前記構造物は、組積構造物であり、
前記棒材を緊張させ、前記組積構造物に圧縮力を付与する緊張工程を有する、
請求項１に記載の構造物の補強工法。 The structure is a masonry structure and
It has a tensioning step of tensioning the bar and applying a compressive force to the masonry structure.
The structural reinforcement method according to claim 1. 前記組積構造物は、レンガ壁である、
請求項２に記載の構造物の補強工法。 The masonry structure is a brick wall,
The structural reinforcement method according to claim 2. 前記支持部に形成された前記挿入孔の一部に拡径部を形成する拡径工程が、前記棒材挿入工程の前に行われる、
請求項１～請求項３の何れか１項に記載の構造物の補強工法。 The diameter-expanding step of forming the diameter-expanding portion in a part of the insertion hole formed in the support portion is performed before the bar material insertion step.
The structural reinforcement method according to any one of claims 1 to 3. 前記拡径部は、前記支持部に形成された前記挿入孔の中間部に形成されており、
前記拡径部よりも奥側の前記挿入孔に挿入された前記棒材には、定着部材が取り付けられている、請求項４に記載の構造物の補強工法。 The enlarged diameter portion is formed in an intermediate portion of the insertion hole formed in the support portion.
The reinforcing method for a structure according to claim 4, wherein a fixing member is attached to the bar material inserted into the insertion hole on the back side of the enlarged diameter portion. 前記挿入孔は、前記構造物の上面から、前記構造物の下方に設けられた前記支持部に向けて穿孔されている、請求項１～請求項５の何れか１項に記載の構造物の補強工法。 The structure according to any one of claims 1 to 5, wherein the insertion hole is drilled from the upper surface of the structure toward the support portion provided below the structure. Reinforcement method.
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