JP2010234653A - Concrete cutting method using wire saw - Google Patents

Concrete cutting method using wire saw Download PDF

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JP2010234653A
JP2010234653A JP2009085291A JP2009085291A JP2010234653A JP 2010234653 A JP2010234653 A JP 2010234653A JP 2009085291 A JP2009085291 A JP 2009085291A JP 2009085291 A JP2009085291 A JP 2009085291A JP 2010234653 A JP2010234653 A JP 2010234653A
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wire saw
cutting
core holes
cut
concrete
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JP5247563B2 (en
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Norio Maruyama
宣男 丸山
Yuki Yamada
祐輝 山田
Kyohei Tsujimoto
恭平 辻本
Hiromi Ichimaru
博美 市丸
Tatsuhiro Furunaga
達廣 古長
Toshiya Nomura
俊也 野村
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Nippon Steel Corp
Okumura Corp
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Nippon Steel Corp
Okumura Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method for concrete, by which a concrete structure can be efficiently cut to a predetermined depth by imparting a press-cutting force to a wire saw when a predetermined part of the concrete structure is cut through press-cutting using the wire saw from the surface side. <P>SOLUTION: For both side supporting arms 4 and 4, the wire saw 6 is stretched between the distal end guide pulleys 5 and 5. Both side supporting arms are inserted in both side core holes 2 and 2 which are drilled to a predetermined depth on both ends of a planned cutting section 1 of the concrete structure which plans to be cut, and the wire saw 6 is made to run under a tension. Thus, the planned cutting section 1 between both side core holes 2 and 2 is cut. At the same time, an intermediate supporting arm 7 is inserted in an intermediate core hole 3 which is drilled between both side core holes 2 and 2 in advance at the time of the cutting. Then, an intermediate section of the wire saw 6 is made to advance downward by the distal end guide pulley 8 of the intermediate supporting arm, and the planned cutting section is cut to the predetermined depth while imparting a press-cutting force. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ワイヤソーを使用してコンクリート構造物の所定部分を表面側から押し切りによって切断するコンクリート切断方法に関するものである。   The present invention relates to a concrete cutting method in which a predetermined portion of a concrete structure is cut from the surface side by pressing using a wire saw.

ワイヤソーを備えた切断装置によってコンクリート構造物を切断するには、コンクリート構造物が柱や筒状体、或いは軸体などのようにワイヤソーを一巻き状に掛け渡し可能なコンクリート構造物の場合には、掛け渡したワイヤソーを一定の張力でもって走行させながら該ワイヤソーを構造物に食い込ませる方向に引っ張る、所謂、引き切り方法によって切断することができるが、コンクリート構造物の一部をブロック状等のように切除しなければないない場合には、その切断すべき部分にワイヤソーを掛け渡すことができないために、コンクリート構造物の表面（自由面）側からワイヤソーを押し付けながら所定部分を所定深さまで切断していく、所謂、押し切り方法を採用している。   In order to cut a concrete structure with a cutting device equipped with a wire saw, the concrete structure is a concrete structure that can be wound around a wire saw like a pillar, cylinder, or shaft. The wire saw can be cut by a so-called pulling method in which the wire saw is pulled into the structure while being run with a constant tension. If it must be excised, the wire saw cannot be passed over the portion to be cut, so the predetermined portion is cut to a predetermined depth while pressing the wire saw from the surface (free surface) side of the concrete structure. A so-called push-off method is employed.

このような押し切り方法としては、従来から、例えは特許文献１に記載されている方法が採用されている。この方法は、図７に示すように、コンクリート面20に所定間隔を存してコア孔21、21を穿設する一方、これらのコア孔21、21と同一間隔を存して互いに平行に対向している２本の支持アーム22、22の先端にガイドプーリ23、23を回転自在に軸支し、これらのガイドプーリ23、23間にワイヤソー24を掛け渡すと共にこのワイヤソー24を支持アーム22、22に沿わしてこれらの支持アーム22、22の適所に設けているガイドプーリ（図示せず）から外部に配設した駆動プーリ（図示せず）に無端状に掛け渡してなる切断装置を使用し、上記支持アーム22、22をそれぞれコア孔21、21の奥底まで挿入すると共にワイヤソー24に張力を掛けながら高速で走行させてコア孔21、21間のコンクリート部分を下方に向かって所定深さまで切断している。   As such a push-off method, conventionally, for example, a method described in Patent Document 1 has been adopted. In this method, as shown in FIG. 7, core holes 21 and 21 are formed on the concrete surface 20 at a predetermined interval, while the core holes 21 and 21 are opposed to each other in parallel at the same interval. The guide pulleys 23 and 23 are rotatably supported at the tips of the two support arms 22 and 22, and a wire saw 24 is stretched between the guide pulleys 23 and 23, and the wire saw 24 is supported by the support arm 22, A cutting device that runs endlessly from a guide pulley (not shown) provided outside the support arm 22, 22 along a drive pulley (not shown) disposed outside is used. The support arms 22 and 22 are inserted to the bottom of the core holes 21 and 21, respectively, and run at a high speed while applying tension to the wire saw 24, and the concrete portion between the core holes 21 and 21 is lowered downward to a predetermined depth. Disconnected.

この際、切断開始時においては、ワイヤソー24は、両コア孔21、21の開口端間の切断すべきコンクリート面に接した状態から両コア孔21、21内を両側支持アーム22、22に沿ってこれらの支持アーム22、22の先端ガイドプーリ23、23に掛け渡されたのち、折り返してコア孔22、22の開口端から外部に引き出された状態となっているから、両側支持アーム22、22の先端ガイドプーリ23、23間にアーチ状に掛け渡されているワイヤソー部分に作用する押し切り方向の切断力が大きくなって能率よく切断していくことができる。   At this time, at the start of cutting, the wire saw 24 is in contact with the concrete surface to be cut between the open ends of the core holes 21 and 21 so that the inside of the core holes 21 and 21 extends along the support arms 22 and 22 on both sides. After being passed over the front end guide pulleys 23, 23 of these support arms 22, 22, the folded back and pulled out from the open ends of the core holes 22, 22, both side support arms 22, The cutting force in the push-off direction acting on the wire saw portion that is arched between the 22 front end guide pulleys 23 and 23 is increased, and cutting can be performed efficiently.

特許第３７３０６９０号公報Japanese Patent No. 3730690

しかしながら、両コア孔22、22間のコンクリート部分が下方に向かって切断されるに従って、図８に示すように、該コンクリート部分を切断する両支持アーム22、22の先端ガイドプーリ23、23間に掛け渡しているワイヤソー部分の長さが短くなってアーチ状に湾曲している該ワイヤソー部分の湾曲度が緩やかになり、その湾曲度が水平に近づく程、下向き、即ち、押し切り方向に作用する張力の分力が小さくなって切断力が低下し、それに伴って切断速度が著しく減少して切断作業に長時間を要するばかりでなく、その分、ワイヤソー24の損耗が激しくなるといった問題点がある。   However, as the concrete portion between both core holes 22 and 22 is cut downward, as shown in FIG. 8, between the end guide pulleys 23 and 23 of both support arms 22 and 22 that cut the concrete portion. The length of the wire saw part that is being stretched is shortened, and the degree of curvature of the wire saw part that is curved in an arch shape becomes gentle. Accordingly, there is a problem that not only the cutting force is reduced and the cutting force is reduced, but the cutting speed is remarkably reduced to require a long time for the cutting work, and the wear of the wire saw 24 is correspondingly increased.

本発明はこのような問題点に鑑みてなされたもので、その目的とするところは、ワイヤソーを使用した押し切りによるコンクリートの切断方法において、両支持アームの先端ガイドプーリ間に掛け渡されたワイヤソーによるコンクリートに対する押し切り力をその走行途上の中間部にも付与して所定深さまで正確に且つ能率よく切断することができるワイヤソーによるコンクリート切断方法を提供するにある。   The present invention has been made in view of such problems, and an object of the present invention is to use a wire saw spanned between tip guide pulleys of both support arms in a concrete cutting method using a wire saw. An object of the present invention is to provide a concrete cutting method using a wire saw that can apply a pressing force to concrete also to an intermediate portion in the course of traveling and can accurately and efficiently cut to a predetermined depth.

上記目的を達成するために、本発明のワイヤソーによるコンクリート切断方法は、請求項１に記載したように、切断すべきコンクリート面に計画切断長さ間隔を存してその計画切断部分の両端にコア孔を所定深さまで穿設すると共にこれらのコア孔を両側コア孔として上記計画切断部分の長さ方向の中間部に上記両側コア孔に平行に中間コア孔を穿設したのち、先端ガイドブーリ間にワイヤソーを掛け渡している両側支持アームを上記両側コア孔にそれぞれ挿入して、一定の張力下でもって走行する上記ワイヤソーにより上記両側コア孔間のコンクリート部分を切断すると共に、上記中間コア孔に中間支持アームを挿入してその先端に設けている中間ガイドプーリにより両側支持アームの先端ガイドプーリ間に掛け渡している上記切断中のワイヤソーの長さ方向の中間部を挿入方向に押し進めることにより、両側コア孔間のコンクリート部分をワイヤソーによって所定深さまで切断することを特徴とする。   In order to achieve the above object, a concrete cutting method using a wire saw according to the present invention is characterized in that, as described in claim 1, cores are provided at both ends of the planned cutting portion with a planned cutting length interval on the concrete surface to be cut. After drilling holes to a predetermined depth and making these core holes as both-side core holes in the middle part in the longitudinal direction of the planned cut portion, the intermediate core holes are drilled in parallel to the both-side core holes, Both side support arms that span the wire saw are inserted into the both side core holes respectively, and the concrete portion between the both side core holes is cut by the wire saw that runs under a constant tension, and the intermediate core hole is intermediate The cutting arm is inserted between the tip guide pulleys of the both side support arms by the intermediate guide pulley provided at the tip of the support arm. By pushing the middle portion in the length direction of Yaso in the insertion direction, characterized by cutting the concrete portion between both side core hole to a predetermined depth by a wire saw.

このように構成したワイヤソーによるコンクリートの切断方法において、請求項２に係る発明は、両側コア孔間に中間コア孔を２本、両側コアと同じ深さまで穿設し、これらの中間コア孔に、両側支持アームの先端ガイドプーリ間に掛け渡しているワイヤソーの中間部分を押圧する中間ガイドプーリを設けた二本の中間支持アームをそれぞれ挿入することを特徴とする。   In the concrete cutting method using the wire saw configured as described above, the invention according to claim 2 includes two intermediate core holes between both side core holes, drilled to the same depth as the both side core holes. Two intermediate support arms each provided with an intermediate guide pulley that presses an intermediate portion of a wire saw that spans between tip guide pulleys of both side support arms are respectively inserted.

請求項１に係る発明によれば、両側支持アームの先端ガイドプーリ間に掛け渡しているワイヤソーによって切断すべきコンクリートの計画長さ部分を切断しながら、両側支持アームの先端ガイドプーリ間のワイヤソーの中間部を中間支持アームの先端ガイドプーリによって押し進めていくので、コンクリートを切断中のワイヤソーの中間部に大きな押し切り力を付与することができて、ワイヤソーの張力による押し切り方向の分力と共に切断力が増大し、コンクリートの切断速度を高めることができて計画深さまで能率よく切断することができる。   According to the first aspect of the invention, the wire saw between the tip guide pulleys of the both side support arms is cut while cutting the planned length portion of the concrete to be cut by the wire saw spanned between the tip guide pulleys of the both side support arms. Since the intermediate portion is pushed forward by the tip guide pulley of the intermediate support arm, a large pressing force can be applied to the intermediate portion of the wire saw that is cutting concrete, and the cutting force is combined with the component force in the pressing direction due to the tension of the wire saw. Increases the concrete cutting speed, and can cut efficiently to the planned depth.

その上、中間支持アームの先端ガイドプーリが計画深さにまで達した時には、両側支持アームの先端ガイドプーリとこの中間支持アームの先端ガイドプーリ間に掛け渡されているワイヤソー部分、即ち、隣接する先端ガイドプーリ間でアーチ状に湾曲しながらコンクリートを切断していくワイヤソー部分の湾曲高さが、中間支持アームを使用することなく両側支持アームの先端ガイドプーリ間に掛け渡されたワイヤソーに比べて著しく低くすることができ、従って、未だに切断されない残存コンクリート部分が少なくなってその切除作業も短時間で行うことができる。   In addition, when the tip guide pulley of the intermediate support arm reaches the planned depth, the wire saw portion spanned between the tip guide pulley of the both-side support arm and the tip guide pulley of the intermediate support arm, that is, adjacent to it. The bending height of the wire saw part that cuts the concrete while curving in an arch shape between the tip guide pulleys, compared to the wire saw that is spanned between the tip guide pulleys of the both side support arms without using the intermediate support arm Therefore, the remaining concrete portion that has not yet been cut can be reduced, and the excision work can be performed in a short time.

さらに、請求項２に係る発明によれば、上記中間コア孔を２本、両側コアと同じ深さまで穿設し、これらの中間コア孔に、両側支持アームの先端ガイドプーリ間に掛け渡しているワイヤソーの中間部分を押圧する中間ガイドプーリを設けた二本の中間支持アームをそれぞれ挿入してコア孔の内底部に向かって押し進めていくので、両側支持アームの先端ガイドプーリ間を走行するワイヤソーによって切断されるコンクリートの計画切断長さ部分を上記二本の中間支持アームの先端ガイドプーリによって３等分した状態にしてそれぞれの部分を均等に所定深さまで能率よく且つ正確に切断することができると共に、これらの中間支持アームの先端ガイドプーリが計画深さまで達した時における隣接するガイドプーリ間に掛け渡されたアーチ状に湾曲しながら切断するワイヤソー部分の湾曲高さを極めて低くすることができ、計画深さまで一層能率よく切断することができる。   Furthermore, according to the invention according to claim 2, two intermediate core holes are drilled to the same depth as the both side cores, and these intermediate core holes are spanned between the guide pulleys of the both side support arms. Two intermediate support arms provided with intermediate guide pulleys that press the intermediate part of the wire saw are inserted and pushed toward the inner bottom of the core hole. The planned cutting length portion of the concrete to be cut is divided into three equal parts by the tip guide pulleys of the two intermediate support arms, and each portion can be cut efficiently and accurately to a predetermined depth. When the tip guide pulley of these intermediate support arms reaches the planned depth, it is in the shape of an arch spanned between adjacent guide pulleys. Songs and can be very low curvature height of the wire saw portions of cutting while, can be cut more efficiently to plan depth.

コンクリートを切断している状態の簡略縦断正面図。The simplified longitudinal front view of the state which is cutting concrete. コンクリート切断装置全体の簡略正面図。The simplified front view of the whole concrete cutting device. その装置の要部の斜視図。The perspective view of the principal part of the apparatus. 中間支持アーム部分の平面図。The top view of an intermediate | middle support arm part. 中間支持アームがコア孔の内底部に達した状態の簡略縦断正面図。The simplified longitudinal cross-sectional front view of the state which the intermediate support arm reached the inner bottom part of the core hole. ２本の中間支持アームを使用した切断方法を示す簡略縦断正面図。The simplified longitudinal cross-sectional front view which shows the cutting method using two intermediate support arms. 従来の切断方法を説明するための簡略縦断正面図。The simplified longitudinal front view for demonstrating the conventional cutting method. その切断完了状態を示す簡略縦断正面図。The simplified longitudinal front view which shows the cutting completion state.

次に、本発明の具体的な実施例を図面について説明すると、図１は本発明ワイヤソーによるコンクリートの切断方法を実施している状態の簡略縦断正面図、図２はその装置全体の簡略正面図であって、まず、コンクリート構造物における切断すべきコンクリート部分、即ち、計画切断部分１のコンクリート面に、計画切断長さ間隔（図においては左右方向の間隔）を存して後述する支持アームが挿入可能なコア孔２、２を計画切断深さに達するまで互いに平行になるように垂直に穿設すると共に、これらのコア孔２、２間を結ぶ計画切断線の中間部に、これらのコア孔２、２を両側コア孔として後述する中間支持アーム７が挿入可能な中間コア孔３を両側コア孔２、２に平行に且つこれらのコア孔２と同一深さまで垂直に穿設したのち、まず、両側コア孔２、２に両側支持アーム４、４をそれぞれ挿入する。   Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified longitudinal sectional front view of a state in which a concrete cutting method using the wire saw of the present invention is performed, and FIG. 2 is a simplified front view of the entire apparatus. First, a support arm, which will be described later, is provided on the concrete portion to be cut in the concrete structure, that is, on the concrete surface of the planned cut portion 1 with a planned cut length interval (interval in the left-right direction in the figure). The insertable core holes 2 and 2 are vertically drilled so as to be parallel to each other until the planned cutting depth is reached, and these cores are provided in the middle of the planned cutting line connecting the core holes 2 and 2. After drilling an intermediate core hole 3 into which the later-described intermediate support arm 7 can be inserted using the holes 2 and 2 as both side core holes, parallel to both side core holes 2 and 2 and vertically to the same depth as these core holes 2, First Inserting each bilateral support arms 4, 4 on each side the core hole 2,2.

この両側支持アーム４、４はコア孔２の深さよりも長い棒状材からなり、その先端（下端）にワイヤソー６のガイドプーリ５、５をそれぞれ回転自在に軸支してあり、これらのガイドプーリ５、５間に上記計画切断部分１を切断するワイヤソー６の一部分が掛け渡されている。   The both side support arms 4, 4 are made of a rod-like material longer than the depth of the core hole 2, and guide pulleys 5, 5 of the wire saw 6 are rotatably supported at the tips (lower ends) thereof. A portion of the wire saw 6 that cuts the planned cut portion 1 is stretched between the wires 5 and 5.

このワイヤソー６を備えた切断装置としては、図２に示すように、両側コア孔２、２の開口端におけるコンクリート面上に、両側支持アーム４、４の上記先端ガイドプーリ５、５からこれらの支持アーム４、４に沿ってコア孔２、２の開口端に引き出されたワイヤソー部分を掛け渡している固定ガイドプーリ15、15を回転自在に設置してあり、さらに、ワイヤソー６はこれらの固定ガイドプーリ15、15から移動台車16上に設置しているモータ等の回転駆動機構（図示せず）により回転させられる駆動プーリ17に無端状に掛け渡した構造を有しているが、ワイヤソー６を所定の張力を付与しながら無端状に走行駆動する装置としてはこの装置に限定されることなくその他の適宜な構造を採用してもよい。   As shown in FIG. 2, the cutting device provided with the wire saw 6 is formed on the concrete surface at the open ends of the both-side core holes 2, 2 from the tip guide pulleys 5, 5 of the both-side support arms 4, 4. Fixed guide pulleys 15 and 15 are installed rotatably along the support arms 4 and 4 so as to hang the wire saw portions drawn to the open ends of the core holes 2 and 2, and the wire saw 6 is fixed thereto. The wire saw 6 has an endlessly looped structure around a drive pulley 17 that is rotated from a guide pulley 15, 15 by a rotary drive mechanism (not shown) such as a motor installed on the movable carriage 16. The device that travels endlessly while applying a predetermined tension is not limited to this device, and other appropriate structures may be adopted.

先端ガイドプーリ５、５間にワイヤソー６を掛け渡している上記両側支持アーム４、４をそれぞれ両側のコア孔２、２内にその先端ガイドプーリ５、５が孔底に達するまで挿入すると、ワイヤソー６は両側コア孔２、２の開口端間の計画切断部分１のコンクリート表面（上面）から両側コア孔２、２内に入って両側支持アーム４、４の先端ガイドプーリ５、５に掛け渡された状態、即ち、計画切断部分１を上面から両側面に亘って囲むようにアーチ状に湾曲した状態で配設されてあり、先端ガイドプーリ５、５に掛け渡されたのち、コア孔２、２内を上方に引き出されて上述したように固定ガイドプーリ15、15から駆動プーリ17に無端状に掛け渡されている。   When the both side support arms 4, 4 spanning the wire saw 6 between the tip guide pulleys 5, 5 are inserted into the core holes 2, 2 on both sides until the tip guide pulleys 5, 5 reach the hole bottom, 6 is a concrete surface (upper surface) of the planned cut portion 1 between the open ends of both side core holes 2, 2, and enters both side core holes 2, 2 and spans the end guide pulleys 5, 5 of both side support arms 4, 4. In other words, it is arranged in an arched shape so as to surround the planned cutting portion 1 from the upper surface to both side surfaces, and is placed on the tip guide pulleys 5, 5, and then the core hole 2. 2 is drawn upward and is extended endlessly from the fixed guide pulleys 15 and 15 to the drive pulley 17 as described above.

このように両側支持アーム４、４の先端ガイドプーリ５、５間にワイヤソー６を掛け渡している両側支持アーム４、４をそれぞれ両側コア孔２、２内に挿入したのち、両側コア孔２、２間に設けている上記中間コア孔３の開口端に中間コア孔３の深さよりも長い真っ直ぐな角棒状材からなる中間支持アーム７の先端（下端）を臨ませ、該中間支持アーム７を中間コア孔３内に向かって降下させることにより、この中間支持アーム７の先端に回転自在に軸支しているガイドプーリ８を両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡している上記ワイヤソー６の長さ方向の中間部に押し付けてその中間部を一定の押圧力でもって下方に押し進める。   Thus, after inserting the both side support arms 4 and 4 in which the wire saw 6 is spanned between the tip guide pulleys 5 and 5 of the both side support arms 4 and 4 into the both side core holes 2 and 2, respectively, The end (lower end) of the intermediate support arm 7 made of a straight rectangular bar-like material longer than the depth of the intermediate core hole 3 faces the opening end of the intermediate core hole 3 provided between the two. The guide pulley 8 pivotally supported at the tip of the intermediate support arm 7 is spanned between the tip guide pulleys 5 and 5 of the both side support arms 4 and 4 by being lowered toward the intermediate core hole 3. The wire saw 6 is pressed against the intermediate portion in the length direction, and the intermediate portion is pushed downward with a constant pressing force.

中間支持アーム７は、図３、図４に示すように、その一側面に略全長に亘ってラック９を設けていると共にこのラック９を設けた面に直交する前後両面に一定の突出幅を有する帯板状突片10、10を全長に亘って突設している。そして、この中間支持アーム７を中間コア孔３内に降下させる降下装置としては、対向面に上記中間支持アーム７の前後帯板状突片10、10を両側から挟むようにして上下方向に挿通させる左右一対のガイド片12、12を突設した前後一対の固定金具11、11と、一方の金具11に配置された駆動モータ13と、この駆動モータ13の回転軸に固着されて上記中間支持アーム７の一側面に設けているラック９に噛合するピニオン14とからなる。   As shown in FIGS. 3 and 4, the intermediate support arm 7 is provided with a rack 9 over substantially the entire length on one side surface, and has a constant protruding width on both front and rear surfaces orthogonal to the surface on which the rack 9 is provided. The strip-shaped projecting pieces 10 and 10 are provided so as to project over the entire length. As a lowering device for lowering the intermediate support arm 7 into the intermediate core hole 3, the right and left belt plate-like projecting pieces 10 and 10 of the intermediate support arm 7 are inserted in the vertical direction so as to be sandwiched from both sides. A pair of front and rear fixing metal fittings 11 and 11 projecting from a pair of guide pieces 12 and 12, a drive motor 13 disposed on one metal fitting 11, and the intermediate support arm 7 fixed to the rotating shaft of the drive motor 13 And a pinion 14 that meshes with a rack 9 provided on one side surface.

この降下装置の上記前後金具11、11を、中間コア孔３の開口端を前後から挟むようにしてコンクリート面上に固定したのち、前後金具11、11間に上方から中間コア孔３に向かって上記中間支持アーム７を介挿することにこの中間支持アーム７の前後面に突設している帯板状突片10、10をこの前後金具11、11の対向面にそれぞれ突設している左右一対のガイド片12、12間に挿通、支持させると共に、中間支持アーム７の一側面に設けている上記ラック９の下端部を駆動モータ13の回転軸に固着している上記ピニオン14に噛合させ、さらに、上記のように中間支持アーム７の先端ガイドプーリ８を両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡している上記ワイヤソー６の長さ方向の中間部に押し付けた状態にして上記降下装置の駆動モータ13を作動させることにより、ピニオン14を回転させてこのピニオン14に噛合している上記ラック９を介して中間支持アーム７を降下させて計画切断部分１を切断中のワイヤソー６の中間部を下方に押し進める。なお、中間支持アーム７を下方に押し進める降下装置としては、上記のようにラック９とピニオン14を使用した装置に限らず、その他の適宜な降下装置を採用してもよい。   After fixing the front and rear metal fittings 11, 11 of this descent device on the concrete surface with the open end of the intermediate core hole 3 sandwiched from the front and rear, the intermediate metal hole 11, 11 is interposed from above to the intermediate core hole 3. A pair of left and right protrusions 10 and 10 projecting from the front and rear surfaces of the intermediate support arm 7 on the front and rear surfaces of the front and rear metal fittings 11 and 11, respectively. Between the guide pieces 12 and 12, and the lower end portion of the rack 9 provided on one side surface of the intermediate support arm 7 is engaged with the pinion 14 fixed to the rotating shaft of the drive motor 13, Further, as described above, the distal end guide pulley 8 of the intermediate support arm 7 is pressed against the intermediate portion in the length direction of the wire saw 6 spanning between the distal end guide pulleys 5 and 5 of the both side support arms 4 and 4. Drive motor 1 of the lowering device 3 is operated to rotate the pinion 14 and lower the intermediate support arm 7 through the rack 9 meshing with the pinion 14 to move the intermediate part of the wire saw 6 cutting the planned cutting part 1 downward. Push forward. The lowering device that pushes the intermediate support arm 7 downward is not limited to the device using the rack 9 and the pinion 14 as described above, and other appropriate lowering devices may be employed.

コンクリート構造物における計画切断部分１の切断開始時においては、この計画切断部分１を切断するワイヤソー６は、両側コア孔２、２間のコンクリート面上からこれらの両側コア孔２、２の開口端に導入されてこれらのコア孔２、２の内底部に配置している両側支持アーム４、４の先端ガイドプーリ５、５に掛け渡されて両側先端ガイドプーリ５、５を両端として上方に向かって大きく湾曲したアーチ形状を呈しており、上記中間支持アーム７の先端ガイドプーリ８はこのアーチ形状に湾曲したワイヤソー６の頂部を図１において二点鎖線で示すように下方に向かって押し進めて計画切断部分１の中央部を大きな切断力でもって切断していくと共に、両側支持アーム４、４の先端ガイドプーリ５、５間を走行するワイヤソー６の張力による押し切り方向の分力を計画切断部分１のコンクリート面に強く作用させながら切断していくことができる。   At the start of cutting the planned cutting portion 1 in the concrete structure, the wire saw 6 that cuts the planned cutting portion 1 is the open end of the both side core holes 2, 2 from the concrete surface between the both side core holes 2, 2. Are introduced into the inner bottom portions of the core holes 2 and 2 and are extended over the tip guide pulleys 5 and 5 of the both-side support arms 4 and 4 so as to face upward with the both-end tip guide pulleys 5 and 5 as both ends. The tip guide pulley 8 of the intermediate support arm 7 pushes the top of the wire saw 6 curved in this arch shape downward as shown by a two-dot chain line in FIG. The central portion of the cutting portion 1 is cut with a large cutting force, and also due to the tension of the wire saw 6 that runs between the tip guide pulleys 5 and 5 of the both side support arms 4 and 4. It can continue to cut while applying strong press-cutting direction of the component force on the concrete surface of the planned cut portion 1.

この際、両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡されているアーチ状に湾曲したワイヤソー６の長さは、このワイヤソー６を駆動する駆動プーリ17を有する上記移動台車16がワイヤソー６に張力を付与しながらその引っ張り方向に移動するに従って短くなり、従って、上記アーチ形状に湾曲するワイヤソー６の頂部の高さが切断が進行するに従って徐々に低くなる。   At this time, the length of the arch-shaped wire saw 6 spanned between the front end guide pulleys 5 and 5 of the both side support arms 4 and 4 is the same as that of the movable carriage 16 having the drive pulley 17 for driving the wire saw 6. However, as the wire saw 6 moves in the pulling direction while applying tension, the height of the apex of the wire saw 6 that curves into the arch shape gradually decreases as the cutting progresses.

さらに、両側支持アーム４、４の先端ガイドプーリ５、５間で上記のように上方に向かってアーチ状に湾曲した状態で計画切断部分１を切断していくワイヤソー６は、その頂部を上記中間支持アーム７の先端ガイドプーリ８によって下方に押し進められると、この中間支持アーム７の先端ガイドプーリ８と、このガイドプーリ８に隣接する両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡されているワイヤソー部分6a、6aが、それぞれ隣接する先端ガイドプーリ５、８から上方に向かってアーチ状に湾曲して二山形状のアーチ部分を形成するが、両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡されているアーチ状に湾曲したワイヤソー６の長さは上述したように切断が進行するに従って短くなると共に、そのアーチ状に湾曲したワイヤソー部分6a、6aの頂部の高さが、上記中間支持アーム７の先端ガイドプーリ８の降下によって徐々に低くなり、中間支持アーム７の先端ガイドプーリ８が中間コア孔３の内底部に達した時には、これらのワイヤソー部分6a、6aから下方に残存する切り残されたコンクリート部分1a、1aが極めて少なくなる（図５参照）。   Furthermore, the wire saw 6 that cuts the planned cutting portion 1 in a state of being curved in an arch shape upward between the tip guide pulleys 5 and 5 of the both side support arms 4 and 4 as described above, When pushed downward by the tip guide pulley 8 of the support arm 7, it is hung between the tip guide pulley 8 of the intermediate support arm 7 and the tip guide pulleys 5, 5 of the side support arms 4, 4 adjacent to the guide pulley 8. The wire saw portions 6a and 6a being passed are curved upwardly from the adjacent tip guide pulleys 5 and 8, respectively, to form a double arch portion. As described above, the length of the wire saw 6 that is curved in an arch shape that spans between the guide pulleys 5 and 5 is shortened as the cutting progresses, and The heights of the curved wire saw portions 6a, 6a are gradually lowered by the lowering of the tip guide pulley 8 of the intermediate support arm 7, and the tip guide pulley 8 of the intermediate support arm 7 is located at the inner bottom portion of the intermediate core hole 3. When it reaches, the concrete parts 1a, 1a left uncut from these wire saw parts 6a, 6a are extremely reduced (see FIG. 5).

従って、この状態から両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡しているワイヤソー６を水平方向に走行させると、上記切り残されたコンクリート部分1a、1aを短時間で切除することができる。   Therefore, when the wire saw 6 spanned between the tip guide pulleys 5 and 5 of the both side support arms 4 and 4 is caused to travel in the horizontal direction from this state, the uncut concrete portions 1a and 1a are cut out in a short time. be able to.

なお、以上の実施例においては、両側支持アーム４、４を挿入する両側コア孔２、２間に中間コア孔３を１箇所、穿設して該中間コア孔３内に挿入する一本の中間支持アーム７の先端ガイドプーリ８によって両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡しているワイヤソー６の中間部を一か所、下方に向かって押し進めながら、コンクリート構造物における計画切断部分１を切断しているが、両側コア孔２、２間に２ヵ所以上の中間コア孔３を穿設し、これらの中間コア孔３内にそれぞれ中間支持アーム７を挿入してその先端ガイドプーリ８により両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡しているワイヤソー６の中間部の数箇所を下方に向かって押し進めながら、コンクリート構造物における計画切断部分１を切断してもよい。   In the above-described embodiment, one intermediate core hole 3 is formed between the both side core holes 2 and 2 into which the both side support arms 4 and 4 are inserted, and is inserted into the intermediate core hole 3. In the concrete structure, the intermediate portion of the wire saw 6 spanned between the distal end guide pulleys 5 and 5 of the both side support arms 4 and 4 is pushed downward at one place by the distal end guide pulley 8 of the intermediate support arm 7. The planned cutting portion 1 is cut, but two or more intermediate core holes 3 are formed between the core holes 2 and 2 on both sides, and intermediate support arms 7 are inserted into the intermediate core holes 3 respectively. A planned cutting portion in a concrete structure while pushing down several intermediate portions of the wire saw 6 spanned between the tip guide pulleys 5 and 5 of the both side support arms 4 and 4 by the tip guide pulley 8. It may be cut.

例えば、図６に示すように、コンクリート構造物における計画切断部分１の両端部に両側コア孔２、２を穿設すると共にこの両側コア孔２、２間の２箇所に中間コア孔３、３を穿設し、先端ガイドプーリ５、５間にワイヤソー６を掛け渡している両側支持アーム４、４をそれそれ上記両側コア孔２、２に挿入して、ワイヤソー６に張力を付与しながら両側コア孔２、２間のコンクリート部分を該ワイヤソー６によって切断していくと共に、その切断時に上記中間コア孔３、３にそれぞれ中間支持アーム７、７を挿入して、その先端ガイドプーリ８、８により両側支持アーム４、４の先端ガイドプーリ５、５間に掛け渡しているワイヤソー６の中間部２ヵ所を下方に向かって押し進めていけば、両側支持アーム４、４の先端ガイドプーリ５、５間を走行するワイヤソー６によって切断されるコンクリートの計画切断長さ部分を上記二本の中間支持アーム７、７の先端ガイドプーリ８、８によって３等分した状態にしてそれぞれの部分を均等に所定深さまで能率よく且つ正確に切断することができる。   For example, as shown in FIG. 6, both side core holes 2 and 2 are formed at both ends of the planned cut portion 1 in the concrete structure, and intermediate core holes 3 and 3 are formed at two locations between the both side core holes 2 and 2. The both side support arms 4, 4 spanning the wire saw 6 between the tip guide pulleys 5, 5 are inserted into the both side core holes 2, 2 respectively to apply tension to the wire saw 6. The concrete portion between the core holes 2 and 2 is cut by the wire saw 6 and the intermediate support arms 7 and 7 are respectively inserted into the intermediate core holes 3 and 3 at the time of cutting. If the two intermediate portions of the wire saw 6 spanned between the tip guide pulleys 5 and 5 of the both side support arms 4 and 4 are pushed downward, the tip guide pulleys 5 and 5 of the side support arms 4 and 4 are pushed downward. The planned cutting length portion of the concrete cut by the wire saw 6 traveling on the road is divided into three equal parts by the tip guide pulleys 8 and 8 of the two intermediate support arms 7 and 7, and the respective portions are equally divided into a predetermined depth. It is possible to cut efficiently and accurately.

１ 計画切断部分
２ 両側コア孔
３ 中間コア孔
４ 両側支持アーム
５ その先端ガイドプーリ
６ ワイヤソー
７ 中間支持アーム
８ その先端ガイドプーリ DESCRIPTION OF SYMBOLS 1 Planned cutting part 2 Both-sides core hole 3 Intermediate core hole 4 Both-side support arm 5 Its front guide pulley 6 Wire saw 7 Intermediate support arm 8 Its front-end guide pulley

Claims (2)

切断すべきコンクリート面に計画切断長さ間隔を存してその計画切断部分の両端にコア孔を所定深さまで穿設すると共にこれらのコア孔を両側コア孔として上記計画切断部分の長さ方向の中間部に上記両側コア孔に平行に中間コア孔を穿設したのち、先端ガイドブーリ間にワイヤソーを掛け渡している両側支持アームを上記両側コア孔にそれぞれ挿入して、所定の張力下でもって走行する上記ワイヤソーにより上記両側コア孔間のコンクリート部分を切断すると共に、上記中間コア孔に中間支持アームを挿入してその先端に設けている中間ガイドプーリにより両側支持アームの先端ガイドプーリ間に掛け渡している上記切断中のワイヤソーの長さ方向の中間部を挿入方向に押し進めることにより、両側コア孔間のコンクリート部分をワイヤソーによって所定深さまで切断することを特徴とするワイヤソーによるコンクリート切断方法。   The concrete surface to be cut has a planned cutting length interval, and core holes are drilled at both ends of the planned cutting part to a predetermined depth, and these core holes are used as both side core holes in the length direction of the planned cutting part. After drilling the intermediate core hole parallel to the both side core holes in the middle part, insert both side support arms that span the wire saw between the tip guide boules into the both side core holes and run under a predetermined tension. The concrete portion between the core holes on both sides is cut by the wire saw, and the intermediate support arm is inserted into the intermediate core hole and is passed between the tip guide pulleys of the both support arms by the intermediate guide pulley provided at the tip thereof. By pushing the intermediate part in the length direction of the wire saw being cut in the insertion direction, the concrete part between the core holes on both sides is Concrete cutting method by a wire saw, characterized in that the cutting to a predetermined depth by. 両側コア孔間に中間コア孔を２本、両側コアと同じ深さまで穿設し、これらの中間コア孔に、両側支持アームの先端ガイドプーリ間に掛け渡しているワイヤソーの中間部分を押圧する中間ガイドプーリを設けた二本の中間支持アームをそれぞれ挿入することを特徴とする請求項１に記載のワイヤソーによるコンクリート切断方法。   Two intermediate core holes are drilled between the core holes on both sides to the same depth as the cores on both sides, and the intermediate part that presses the intermediate part of the wire saw spanned between the guide pulleys of the support arms on both sides into these intermediate core holes. The method of cutting concrete with a wire saw according to claim 1, wherein two intermediate support arms provided with guide pulleys are respectively inserted.
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AT513117A1 (en) * 2012-06-28 2014-01-15 Hatzer milling machine
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