JP2021055284A - Method of drilling hole in structure - Google Patents

Method of drilling hole in structure Download PDF

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JP2021055284A
JP2021055284A JP2019176861A JP2019176861A JP2021055284A JP 2021055284 A JP2021055284 A JP 2021055284A JP 2019176861 A JP2019176861 A JP 2019176861A JP 2019176861 A JP2019176861 A JP 2019176861A JP 2021055284 A JP2021055284 A JP 2021055284A
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drive shaft
hole
tool
base
grindstone
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JP7187417B2 (en
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重信 濱中
Shigenobu Hamanaka
重信 濱中
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Hamanaka Nut Manufacturing Co Ltd
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Abstract

To provide a method capable of reliably drilling a cylindrical hole in a structure having an enlarged diameter portion at a bottom.SOLUTION: The present invention comprises steps of forming a prepared hole 21 with an inner diameter equal to that of a cylindrical hole in a structure, preparing a tool 10 in which a drive shaft 12 having a grindstone or a cemented carbide 13 attached to a tip curved with respect to the central axis is rotatably inserted at a position eccentric with respect to the center of a base 11, inserting the drive shaft of the tool to the vicinity of the bottom of the prepared hole and holding the base on the surface of the structure, partially expanding the diameter of a bottom side surface of the prepared hole by rotating the drive shaft while holding the base, and partially expanding the diameter adjacent to the expanded part of the bottom side surface of the prepared hole by rotating the base by a predetermined angle to move the grindstone or cemented carbide from the partially expanded position by the predetermined angle, and rotating the drive shaft of the tool in that state.SELECTED DRAWING: Figure 2

Description

本発明は構造物の穴あけ方法に関し、特に底部に拡径部が形成された筒状の穴を構造物にあけるようにした方法に関する。 The present invention relates to a method for drilling a hole in a structure, and more particularly to a method in which a tubular hole having an enlarged diameter portion formed at the bottom is formed in the structure.

コンクリート構造物にドリルなどによって筒状の穴を穿設し、そこに鉄筋などのアンカー材を挿入し、グラウト材や樹脂などの後埋め材を注入し固定する補強工事が知られているが、筒状の穴の内面が平滑であると、アンカー材の固定強度が不十分となり、過大な外力が加わったときにアンカー材がコンクリート構造物から抜けるおそれがある（特許文献１）。 Reinforcement work is known in which a tubular hole is drilled in a concrete structure with a drill or the like, an anchor material such as a reinforcing bar is inserted into the hole, and a post-filling material such as grout material or resin is injected and fixed. If the inner surface of the tubular hole is smooth, the fixing strength of the anchor material becomes insufficient, and the anchor material may come off from the concrete structure when an excessive external force is applied (Patent Document 1).

他方、地盤にあけた筒状の穴の底部に掘削ロッドを挿入し、掘削ロッド先端のヘッドに設けた拡径ビットを拡げ、掘削ロッドを回転させることによって下穴底部に拡径部を形成し、この穴にコンクリートを打設して、引き抜き抵抗の大きなコンクリート杭を形成するようにした方法が提案されている（特許文献２、特許文献３）。 On the other hand, an excavation rod is inserted into the bottom of a tubular hole drilled in the ground, the diameter expansion bit provided at the head at the tip of the excavation rod is expanded, and the excavation rod is rotated to form an expansion portion at the bottom of the prepared hole. , A method has been proposed in which concrete is poured into this hole to form a concrete pile having a large pull-out resistance (Patent Documents 2 and 3).

特開２０１２−１７７２２２号公報Japanese Unexamined Patent Publication No. 2012-177222 特開昭６３−２１２４０５号公報JP-A-63-212405 特開平０７−２６８８６７号公報Japanese Unexamined Patent Publication No. 07-268867 特開２００１−４９９７８号公報Japanese Unexamined Patent Publication No. 2001-49978 特開２０１１−１１７１２６号公報Japanese Unexamined Patent Publication No. 2011-117126

しかし、特許文献２〜５記載の拡径方法はヘッドの拡径ビットを拡げ、回転させて地盤にあけた下穴底部を拡径するものであるので、これをコンクリート構造物の穴あけに適用すると、掘削ロッドの姿勢が安定せず、拡径が難しかった。 However, the diameter-expanding method described in Patent Documents 2 to 5 expands the diameter-expanding bit of the head and rotates it to expand the diameter of the bottom of the prepared hole drilled in the ground. , The posture of the excavation rod was not stable, and it was difficult to expand the diameter.

本発明はかかる問題点に鑑み、底部に拡径部を有する円筒状の穴を構造物、例えばコンクリート構造物に確実にあけることができるようにした構造物の穴あけ方法を提供することを課題とする。 In view of such a problem, it is an object of the present invention to provide a method for drilling a cylindrical hole having a diameter-expanded portion at the bottom thereof so that a cylindrical hole can be reliably drilled in a structure, for example, a concrete structure. To do.

そこで、本発明に係る構造物の穴あけ方法は、底部に拡径部を有する円筒状の穴を構造物に形成するにあたり、構造物に上記円筒状の穴と等しい内径の下穴を形成する下穴穿設工程と、中心軸線に対して曲成された先端部に砥石又は超硬金物が取付けられた駆動軸をベースの中心に対して偏心した位置に回転自在に挿通した工具を準備する工具準備工程と、上記工具の駆動軸を上記下穴の底部近傍まで差し込み、上記ベースを構造物表面に保持するセット工程と、上記工具のベースを保持した状態で上記駆動軸を回転させることによって上記下穴の底部側面を部分的に拡径する工程と、上記工具のベースを所定角度回転させて上記砥石又は超硬金物を上記部分的に拡径した位置から上記所定角度移動させ、その状態で上記工具の駆動軸を回転させることによって上記下穴の底部側面の上記拡径した部分に隣接して部分的に拡径する工程と、を備えたことを特徴とする。 Therefore, in the method for drilling a structure according to the present invention, when forming a cylindrical hole having an enlarged diameter portion at the bottom of the structure, a pilot hole having an inner diameter equal to that of the cylindrical hole is formed in the structure. A tool for drilling holes and preparing a tool in which a drive shaft with a grindstone or a super hard metal attached to the tip curved with respect to the central axis is rotatably inserted at a position eccentric with respect to the center of the base. The preparation step, the setting step of inserting the drive shaft of the tool to the vicinity of the bottom of the prepared hole and holding the base on the surface of the structure, and the rotation of the drive shaft while holding the base of the tool. In the process of partially expanding the diameter of the bottom side surface of the pilot hole, and by rotating the base of the tool by a predetermined angle, the grindstone or the superhard metal is moved by the predetermined angle from the partially expanded position, and in that state. It is characterized by comprising a step of partially increasing the diameter adjacent to the increased diameter portion on the bottom side surface of the prepared hole by rotating the drive shaft of the tool.

本発明の特徴の１つはベースを下穴に取付けて駆動軸を偏心して下穴にセットし、駆動軸の先端部を曲成して砥石又は超硬金物を取付け、駆動軸を回転させて下穴の底部側面を部分的に拡径し、ベースを所定角度を旋回させて駆動軸を回転させて部分的に拡径した部分に隣接して部分的に拡径し、これを繰り返すことによって下穴の底部側面に拡径部分を形成するようにした点にある。 One of the features of the present invention is that the base is attached to the prepared hole, the drive shaft is eccentrically set in the prepared hole, the tip of the drive shaft is bent to attach a grindstone or a super hard metal object, and the drive shaft is rotated. By partially expanding the diameter of the bottom side surface of the pilot hole, turning the base at a predetermined angle and rotating the drive shaft to partially expand the diameter adjacent to the partially expanded part, and repeating this. The point is that an enlarged diameter portion is formed on the side surface of the bottom of the prepared hole.

これにより、地盤に比較して硬いコンクリート構造物にも、底部を拡大した穴をあけることができ、例えば穴にアンカー材を挿入して固定したときに高い引き抜き抵抗を得ることができる。 As a result, it is possible to make a hole with an enlarged bottom even in a concrete structure that is harder than the ground, and for example, when an anchor material is inserted into the hole and fixed, a high pull-out resistance can be obtained.

また、本発明によれば、先端部が中心軸線に対して曲成され、該先端部に砥石又は超硬金物が取付けられ、構造物の上記円筒状の穴と等しい内径の下穴底部近傍まで差し込まれて回転されることによって上記砥石又は超硬金物が上記下穴の底部側面を部分的に拡径する駆動軸と、中心に対して偏心した位置に軸受穴が形成され、該軸受穴に上記駆動軸が回転自在に挿通され、上記工具の駆動軸が上記下穴の差し込まれた状態で上記ベースを構造物表面に保持され、その状態で上記駆動軸が回転させるのを許容し、所定角度回転されて上記砥石を上記部分的に拡径した位置から上記所定角度移動させ得るベースと、を備えたことを特徴とする構造物の穴あけ用工具を提供することができる。 Further, according to the present invention, the tip portion is curved with respect to the central axis, and a grindstone or a super hard metal object is attached to the tip portion, up to the vicinity of the bottom of the prepared hole having an inner diameter equal to the cylindrical hole of the structure. A drive shaft that partially expands the diameter of the bottom side surface of the prepared hole by being inserted and rotated, and a bearing hole are formed at a position eccentric with respect to the center, and the bearing hole is formed. The drive shaft is rotatably inserted, the drive shaft of the tool is held on the surface of the structure in a state where the pilot hole is inserted, and the drive shaft is allowed to rotate in that state. It is possible to provide a tool for drilling a structure, which comprises a base that can be rotated by an angle to move the grindstone by the predetermined angle from the partially enlarged diameter position.

この場合、駆動軸にはばね性を付与するのがよい。 In this case, it is preferable to impart springiness to the drive shaft.

本発明に係る構造物の穴あけ用工具の好ましい実施形態を示す図である。It is a figure which shows the preferable embodiment of the tool for drilling a structure which concerns on this invention. 上記実施形態による穴あけ方法を模式的に示す図である。It is a figure which shows typically the drilling method by the said embodiment.

以下、本発明を図面に示す具体例に基づいて詳細に説明する。図１は本発明に係る構造物の穴あけ用工具の好ましい実施形態を、図２は本発明に係る構造物の穴あけ方法の好ましい実施形態を示す。構造物の穴あけ用工具１０は図１に示されるように、ベース１１、駆動軸１２及び砥石１３から構成されている。 Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. FIG. 1 shows a preferred embodiment of a structure drilling tool according to the present invention, and FIG. 2 shows a preferred embodiment of a structure drilling method according to the present invention. As shown in FIG. 1, the drilling tool 10 for a structure is composed of a base 11, a drive shaft 12, and a grindstone 13.

ベース１１は中心から偏心した位置に軸受穴１１Ａが形成され、軸受穴１１Ａには駆動軸１２が回転自在に挿通されている。この駆動軸１２にはばね鋼材が用いられ、駆動軸１２の先端部は曲成され、該先端部には砥石（又は超硬金物）１３が取付けられている。 A bearing hole 11A is formed in the base 11 at a position eccentric from the center, and a drive shaft 12 is rotatably inserted into the bearing hole 11A. A spring steel material is used for the drive shaft 12, the tip of the drive shaft 12 is curved, and a grindstone (or cemented carbide) 13 is attached to the tip.

構造物に筒状の穴をあける場合、構造物２０に図２の（ａ）に示されるように、構造物２０にドリルなどを用いて下穴２１をあける。この下穴２１は穿設すべき筒状の穴とほぼ等しい内径とする。 When drilling a tubular hole in the structure, a pilot hole 21 is drilled in the structure 20 using a drill or the like as shown in FIG. 2 (a). The prepared hole 21 has an inner diameter substantially equal to that of the tubular hole to be drilled.

下穴２１が形成できると、図２の（ａ）に示されるように、下穴２１内に駆動軸１２を挿入し、ベース１１を下穴２１の周縁に保持して工具１０をセットする。この駆動軸１２の先端部は曲成されて砥石（又は超硬金物）１３が取付けられている。 When the pilot hole 21 can be formed, as shown in FIG. 2A, the drive shaft 12 is inserted into the pilot hole 21, the base 11 is held on the peripheral edge of the pilot hole 21, and the tool 10 is set. The tip of the drive shaft 12 is curved and a grindstone (or cemented carbide) 13 is attached to the drive shaft 12.

工具１０がセットできると、駆動軸１２を回転させ、砥石（又は超硬金物）１３が下穴１２の底部側面の一部を部分的に掘削しながら拡径する。 When the tool 10 can be set, the drive shaft 12 is rotated, and the grindstone (or cemented carbide) 13 expands the diameter while partially excavating a part of the bottom side surface of the prepared hole 12.

下穴２１の底部側面が部分的に拡径できると、ベース１１を所定角度旋回させて保持し、その状態で駆動軸１２を回転させると、部分的に拡径された部分２２に隣接する部分を砥石（又は超硬金物）１３が部分的に掘削しながら拡径し、図２の（ｂ）に示されるように、下穴２１の底部に部分拡径部２２を形成することができる。 When the bottom side surface of the prepared hole 21 can be partially expanded in diameter, the base 11 is swiveled and held by a predetermined angle, and when the drive shaft 12 is rotated in that state, a portion adjacent to the partially expanded portion 22 is formed. The diameter of the grindstone (or cemented carbide) 13 is expanded while being partially excavated, and a partially enlarged diameter portion 22 can be formed at the bottom of the prepared hole 21 as shown in FIG. 2 (b).

同様にして、ベース１１を所定角度旋回させ、駆動軸１２を回転させると、図２の（ｃ）に示されるように、下穴２１の底部に部分拡径部２２を形成することができ、この作業を繰り返すと、下穴２１の底部に拡径部を形成することができる。 Similarly, when the base 11 is swiveled by a predetermined angle and the drive shaft 12 is rotated, a partially enlarged diameter portion 22 can be formed at the bottom of the prepared hole 21 as shown in FIG. 2 (c). By repeating this operation, an enlarged diameter portion can be formed at the bottom of the prepared hole 21.

こうして拡径部を有する筒状の穴２１が得られると、例えば拡径部２２に抜け止め部材を投入し、抜け止め部材の間にアンカー材を差し込み、コンクリートを打設し、コンクリートが固化すると、アンカー材を強固に固定できる。 When a tubular hole 21 having a diameter-expanded portion is obtained in this way, for example, a retaining member is inserted into the diameter-expanded portion 22, an anchor material is inserted between the retaining members, concrete is cast, and the concrete solidifies. , The anchor material can be firmly fixed.

１０ 穴あけ用工具
１１ ベース
１１Ａ 軸受穴
１２ 駆動軸
１３ 砥石又は超硬金物
２０ 構造物
２１ 下穴
２２ 部分拡径部
10 Drilling tool 11 Base 11A Bearing hole 12 Drive shaft 13 Whetstone or carbide 20 Structure 21 Pilot hole 22 Partial diameter expansion part

Claims (2)

底部に拡径部を有する円筒状の穴を構造物に形成するにあたり、
構造物に上記円筒状の穴と等しい内径の下穴を形成する下穴穿設工程と、
中心軸線に対して曲成された先端部に砥石又は超硬金物が取付けられた駆動軸をベースの中心に対して偏心した位置に回転自在に挿通した工具を準備する工具準備工程と、
上記工具の駆動軸を上記下穴の底部近傍まで差し込み、上記ベースを構造物表面に保持するセット工程と、
上記工具のベースを保持した状態で上記駆動軸を回転させることによって上記下穴の底部側面を砥石又は超硬金物によって部分的に拡径する工程と、
上記工具のベースを所定角度回動させて上記砥石又は超硬金物を上記部分的に拡径した位置から上記所定角度移動させ、その状態で上記工具の駆動軸を回転させることによって上記下穴の底部側面の上記拡径した部分に隣接して部分的に拡径する工程と、
を備えたことを特徴とする構造物の穴あけ方法。 In forming a cylindrical hole with an enlarged diameter at the bottom in the structure,
A pilot hole drilling process for forming a pilot hole with an inner diameter equal to that of the cylindrical hole in the structure,
A tool preparation process that prepares a tool in which a drive shaft with a grindstone or cemented carbide attached to the tip curved with respect to the central axis is rotatably inserted at a position eccentric with respect to the center of the base.
A setting process in which the drive shaft of the tool is inserted close to the bottom of the prepared hole and the base is held on the surface of the structure.
A step of partially expanding the diameter of the bottom side surface of the prepared hole with a grindstone or a cemented carbide by rotating the drive shaft while holding the base of the tool.
By rotating the base of the tool by a predetermined angle to move the grindstone or the cemented carbide from the partially enlarged diameter position by the predetermined angle, and rotating the drive shaft of the tool in that state, the pilot hole is formed. A step of partially expanding the diameter adjacent to the expanded portion of the bottom side surface, and
A method of drilling a structure, which is characterized by being equipped with. 先端部が中心軸線に対して曲成され、該先端部に砥石又は超硬金物が取付けられ、構造物の上記円筒状の穴と等しい内径の下穴底部近傍まで差し込まれて回転されることによって上記砥石又は超硬金物が上記下穴の底部側面を部分的に拡径する駆動軸と、
中心に対して偏心した位置に軸受穴が形成され、該軸受穴に上記駆動軸が回転自在に挿通され、上記工具の駆動軸が上記下穴の差し込まれた状態で上記ベースを構造物表面に保持され、その状態で上記駆動軸が回転させるのを許容し、所定角度回動されて上記砥石又は超硬金物を上記部分的に拡径した位置から上記所定角度移動させ得るベースと、
を備えたことを特徴とする構造物の穴あけ用工具。
The tip is curved with respect to the central axis, a grindstone or cemented carbide is attached to the tip, and the tip is inserted and rotated to the vicinity of the bottom of a pilot hole having an inner diameter equal to that of the cylindrical hole of the structure. A drive shaft in which the grindstone or cemented carbide partially expands the diameter of the bottom side surface of the pilot hole.
A bearing hole is formed at a position eccentric with respect to the center, the drive shaft is rotatably inserted into the bearing hole, and the base is placed on the surface of the structure with the drive shaft of the tool inserted into the prepared hole. A base that is held, allows the drive shaft to rotate in that state, is rotated by a predetermined angle, and can move the grindstone or the super hard metal object by the predetermined angle from the partially expanded position.
A tool for drilling holes in structures, which is characterized by being equipped with.
JP2019176861A 2019-09-27 2019-09-27 Structure drilling method Active JP7187417B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55144918A (en) * 1979-04-24 1980-11-12 Sanchez Velasco Vicente Device for expanding drilled hole
JPH08193484A (en) * 1995-01-13 1996-07-30 Tsutomu Oshima Excavator and hole expanding bit therefor
JP2016043467A (en) * 2014-08-26 2016-04-04 住友電工焼結合金株式会社 Method for manufacturing sintered component having through hole, sintered component and drilling tool
JP2016098551A (en) * 2014-11-21 2016-05-30 株式会社近畿開発 Hole forming method for concrete structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55144918A (en) * 1979-04-24 1980-11-12 Sanchez Velasco Vicente Device for expanding drilled hole
JPH08193484A (en) * 1995-01-13 1996-07-30 Tsutomu Oshima Excavator and hole expanding bit therefor
JP2016043467A (en) * 2014-08-26 2016-04-04 住友電工焼結合金株式会社 Method for manufacturing sintered component having through hole, sintered component and drilling tool
JP2016098551A (en) * 2014-11-21 2016-05-30 株式会社近畿開発 Hole forming method for concrete structure

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