JP4708215B2 - Side wall dismantling method for existing structure and side wall dismantling part removal device - Google Patents

Side wall dismantling method for existing structure and side wall dismantling part removal device Download PDF

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JP4708215B2
JP4708215B2 JP2006049716A JP2006049716A JP4708215B2 JP 4708215 B2 JP4708215 B2 JP 4708215B2 JP 2006049716 A JP2006049716 A JP 2006049716A JP 2006049716 A JP2006049716 A JP 2006049716A JP 4708215 B2 JP4708215 B2 JP 4708215B2
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side wall
movable frame
bracket
existing structure
dismantling
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JP2007224675A (en
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収 榎並
章 井出
康弘 津田
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Okumura Corp
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Description

本発明は、主としてトンネル拡幅工事後に新設の拡幅トンネル内に残る既設構造物たる既設トンネルの側壁を解体するのに適用される既設構造物の側壁解体方法並びにこの方法で使用する側壁解体部の撤去装置に関する。   The present invention mainly relates to a method for disassembling a side wall of an existing structure which is applied to dismantling a side wall of an existing tunnel which is an existing structure remaining in a new widening tunnel after the tunnel widening work, and removal of a side wall dismantling part used in this method. Relates to the device.

従来、既設トンネルを使用したままトンネルを拡幅する工法として、既設トンネルの側壁の外側の地山を開削工法等で掘削し、拡幅された新設トンネルの側壁及び天井壁を構築した後、既設トンネルを解体する工法が知られている。尚、掘削を開削工法で行う場合には、掘削完了後に、既設トンネルの天井壁の上面にモルタルを介して型枠を載置し、型枠の上にコンクリートを打ち込んで新設トンネルの天井壁を構築している。   Conventionally, as a method of widening the tunnel while using the existing tunnel, the ground outside the side wall of the existing tunnel is excavated by the open-cut method, etc., and after constructing the side wall and ceiling wall of the widened new tunnel, The method of dismantling is known. When excavation is carried out by the open-cut method, after excavation is completed, a formwork is placed on the upper surface of the ceiling wall of the existing tunnel via mortar, and concrete is placed on the formwork to attach the ceiling wall of the new tunnel. Is building.

既設トンネルの解体は、一般的に、既設トンネルの側壁及び天井壁をブレーカにより破砕することで行われる。ここで、天井壁の解体に際しては、破砕片の落下防止のための大掛かりな養生が必要になる。そして、一日のうち夜間等の限られた時間内で解体作業前の養生の組立てと解体作業後の養生の撤去とを行わなければならず、天井壁の解体作業に費やせる時間が短くなって工期がのびてしまう。   The dismantling of the existing tunnel is generally performed by crushing the side wall and ceiling wall of the existing tunnel with a breaker. Here, when dismantling the ceiling wall, a large-scale curing is required to prevent the fragments from falling. In addition, it is necessary to assemble the curing before the dismantling work and remove the curing after the dismantling work within a limited time such as at night in the day, and the time that can be spent on the dismantling work of the ceiling wall is shortened. The construction period will be extended.

かかる不具合を解消するため、既設トンネル内を走行可能な台車に昇降テーブルを搭載し、解体すべき天井壁の部分を昇降テーブルに支持させた状態でブロック状に切断し、ブロック状の天井壁解体部を昇降テーブルに載せたまま撤去するようにした方法も知られている（特許文献１参照）。これによれば、破砕片が落下しないため、解体作業前の養生の組立てと解体作業後の養生の撤去とが不要になり、作業効率が向上する。   In order to eliminate such problems, a lifting table is mounted on a cart that can run in an existing tunnel, and the ceiling wall portion to be disassembled is cut into a block shape with the lifting table being supported, and the block-shaped ceiling wall dismantling is performed. There is also known a method in which a part is removed while being placed on a lifting table (see Patent Document 1). According to this, since the crushed pieces do not fall, the assembly of the curing before the dismantling work and the removal of the curing after the dismantling work become unnecessary, and the working efficiency is improved.

ここで、特許文献１には、既設トンネルの側壁の解体方法について記載されていないが、側壁は新設トンネルの側壁との間の空間にブレーカを入れて破砕することができる。この場合、側壁の内側面に養生を施して置くことで既設トンネル内に破砕片が落下することを防止でき、また、この養生は既設トンネルの使用の妨げにならないため留置したままで良く、作業効率が悪くなることはない。   Here, Patent Document 1 does not describe a method for disassembling the side wall of the existing tunnel, but the side wall can be crushed by putting a breaker in a space between the side wall of the new tunnel. In this case, it is possible to prevent the shredded pieces from falling into the existing tunnel by placing the inner side of the side wall with curing, and this curing can be left in place because it does not interfere with the use of the existing tunnel. There is no loss of efficiency.

然し、側壁内側面に施す養生は大掛かりになって工費が高くなる。また、トンネルが左程拡幅されておらず、既設トンネルの側壁と新設トンネルの側壁との間の空間の幅が狭い場合は、この空間にブレーカを入坑できなくなり、手作業で側壁を破砕せざるを得なくなって、作業効率が悪くなる。
特許第３０２３４１５号公報 However, the curing applied to the inner side surface of the side wall becomes large and the construction cost increases. If the tunnel is not widened to the left and the space between the side wall of the existing tunnel and the side wall of the new tunnel is narrow, it will not be possible to enter the breaker into this space, and the side wall will be crushed manually. Inevitably, work efficiency will deteriorate.
Japanese Patent No. 3023415

本発明は、以上の点に鑑み、工費が安く、且つ、既設構造物の側壁の外側の作業空間が狭い場合でも効率良く側壁を解体できるようにした側壁解体方法を提供することを第１の課題とし、また、この解体方法で使用するのに好適な側壁解体部の撤去装置を提供することを第２の課題としている。   In view of the above, the present invention provides a side wall disassembling method in which the construction cost is low and the side wall can be efficiently disassembled even when the work space outside the side wall of the existing structure is narrow. A second problem is to provide a side wall dismantling unit removal device that is suitable for use in this dismantling method.

上記第１の課題を解決するために、外側方に作業空間を介して他の構造物が存在する既設構造物の側壁を解体する本発明の解体方法は、解体すべき側壁の部分である側壁解体部をブロック状に切断する切断工程と、側壁解体部の外側面に担持用ブラケットを固着するブラケット固着工程と、担持用ブラケットに担持爪を係合させ、担持ブラケットに係合させた状態で担持爪を油圧ジャッキで側壁から離反する方向に移動させることにより、ブロック状に切断された側壁解体部を担持用ブラケットを介して担持した状態で側壁の外側方に引き出して撤去する撤去工程とを備えることを特徴とする。 In order to solve the first problem, a disassembly method of the present invention for disassembling a side wall of an existing structure in which another structure exists on the outside via a work space is a side wall which is a part of the side wall to be disassembled. In a state where the disassembling portion is cut into blocks, the bracket fixing step of fixing the holding bracket to the outer surface of the side wall disassembling portion , the holding claws are engaged with the holding bracket, and the holding bracket is engaged. A removal step of moving the carrying claws away from the side wall with a hydraulic jack, and pulling out the side wall demolition part cut into a block shape to the outside of the side wall while carrying it through the carrying bracket; It is characterized by providing.

また、上記第２の課題を解決するため、本発明の撤去装置は、既設構造物の側壁の外側方に側壁の延在方向に移動自在に設けられた台車と、台車上に側壁に接近・離反する方向と上下方向との一方に移動自在に支持された第１可動枠と、第１可動枠に側壁に接近・離反する方向と上下方向との他方に移動自在に支持された第２可動枠と、第２可動枠に設けられた、上記担時用ブラケットに下方から係合可能な担持用爪とを備えることを特徴とする。   Further, in order to solve the second problem, the removal device of the present invention includes a carriage provided on the outer side of the side wall of the existing structure so as to be movable in the extending direction of the side wall, and an approach to the side wall on the carriage. A first movable frame supported movably in one of the separating direction and the vertical direction, and a second movable frame supported movably in the other of the first movable frame and the vertical direction approaching / separating the side wall. A frame and a holding claw provided on the second movable frame and capable of engaging with the holding bracket from below are provided.

本発明の解体方法によれば、ブロック状に切断された側壁解体部をその外側面に固着した担持用ブラケットを利用して側壁の外方に引き出して撤去するため、既設構造物内に側壁の破砕片が落下することはなく、側壁の内側面に大掛かりな養生を施さずに済み、工費が安くなる。更に、側壁の外側に側壁解体部を引き出すに足る幅の作業空間があれば、本発明方法により側壁を解体できる。従って、側壁の外側の作業空間の幅が狭くても効率良く側壁を解体できる。   According to the disassembling method of the present invention, the side wall dismantling portion cut into a block shape is pulled out to the outside of the side wall using the supporting bracket fixed to the outer side surface thereof, so that the side wall dismantling portion in the existing structure is removed. The crushed pieces do not fall, and it is not necessary to apply a large amount of curing to the inner surface of the side wall, thereby reducing the construction cost. Furthermore, if there is a working space that is wide enough to pull out the side wall dismantling part outside the side wall, the side wall can be disassembled by the method of the present invention. Therefore, the side wall can be efficiently disassembled even if the width of the work space outside the side wall is narrow.

また、本発明の撤去装置によれば、台車を側壁解体部に対応する位置に停止させた後、第１可動枠と第２可動枠との動きで担持爪を側壁解体部に接近させて上昇させることにより、担持用ブラケットに下方から担持爪を係合させ、次に、第１可動枠と第２可動枠とのうち側壁に接近・離反する方向に移動自在な可動枠の動きで担持爪を側壁から離反する方向に移動させることにより、側壁解体部を担持爪で担持したまま側壁の外側方に引き出し、その後、台車を移動させて側壁解体部を撤去できる。従って、側壁解体部の撤去作業の能率化を図ることができる。   Further, according to the removal device of the present invention, after the carriage is stopped at the position corresponding to the side wall dismantling part, the carrying claw is moved closer to the side wall dismantling part by the movement of the first movable frame and the second movable frame and lifted. Then, the carrying claws are engaged with the carrying bracket from below, and then the carrying claws are moved by the movement of the movable frame that is movable in the direction of approaching or moving away from the side wall of the first movable frame and the second movable frame. Is moved in a direction away from the side wall, the side wall demolition part is pulled out to the outside of the side wall while being supported by the supporting claws, and then the carriage is moved to remove the side wall demolition part. Therefore, the efficiency of the removal work of the side wall dismantling part can be achieved.

ところで、上述したトンネル拡幅工事では、既設トンネルの天井壁の上面が新設トンネルの天井壁で覆われることになる。このように既設構造物が他の構造物で上面が覆われた天井壁を有する場合、側壁解体部が側壁と天井壁とのコーナ部となる側壁上端部であると、側壁上端部の上面に他の構造物からの抵抗力が作用して、側壁上端部を外側方に水平に引き出すことが困難になる。この場合は、本発明方法の上記切断工程で側壁上端部の下辺を側壁の外側方に向けて斜め下方に傾斜する傾斜面に沿って切断し、上記撤去工程で側壁上端部を側壁の外側方に向けて斜め下方に引き出すことが望ましい。これによれば、側壁上端部が他の構造物の下方に引き離され、他の構造物からの抵抗力を受けずに側壁上端部をスムーズに外側方に引き出すことができる。   By the way, in the tunnel widening construction described above, the upper surface of the ceiling wall of the existing tunnel is covered with the ceiling wall of the new tunnel. In this way, when the existing structure has a ceiling wall whose upper surface is covered with another structure, if the side wall dismantling part is a side wall upper end part that becomes a corner part of the side wall and the ceiling wall, Resistive force from other structures acts to make it difficult to pull the upper end of the side wall horizontally outward. In this case, in the cutting step of the method of the present invention, the lower side of the upper end portion of the side wall is cut along an inclined surface inclined obliquely downward toward the outer side of the side wall, and the upper end portion of the side wall is cut outward of the side wall in the removing step. It is desirable to pull it out obliquely downward. According to this, the upper end portion of the side wall is separated below the other structure, and the upper end portion of the side wall can be smoothly drawn outward without receiving a resistance force from the other structure.

ここで、本発明の撤去装置において、第１可動枠と第２可動枠とのうち側壁に接近・離反する方向に移動自在な一方の可動枠が水平に移動するように構成されていても、当該一方の可動枠と上下方向に移動する他方の可動枠との合成動作で側壁上端部を外側方に向けて斜め下方に引き出すことは可能である。然し、この場合には、一方の可動枠の外側方への移動に対し他方の可動枠の下方への移動が早すぎると、担持爪が担持用ブラケットから外れてしまい、側壁上端部をうまく引き出せなくなる。これに対し、側壁に接近・離反する方向に移動自在な一方の可動枠が、側壁の外側方に向けて斜め下方に傾斜した方向に移動するように構成されていれば、当該一方の可動枠の動きにより側壁解体部を外側方に向けて斜め下方に確実に引き出すことができ、有利である。   Here, in the removal device of the present invention, even if the first movable frame and the second movable frame are configured such that one movable frame that is movable in a direction approaching / separating from the side wall moves horizontally, It is possible to draw the upper end of the side wall obliquely downward toward the outer side by the combining operation of the one movable frame and the other movable frame moving in the vertical direction. However, in this case, if the movement of one movable frame to the outside is too fast to move downward in the other movable frame, the carrying claws come off from the carrying bracket and the upper end of the side wall can be pulled out well. Disappear. On the other hand, if one movable frame that is movable in the direction approaching / separating from the side wall is configured to move obliquely downward toward the outer side of the side wall, the one movable frame By this movement, the side wall dismantling part can be reliably pulled out obliquely downward, which is advantageous.

以下、図２に１で示す矩形断面の既設トンネルを使用したままトンネルの拡幅工事を行った後、拡幅された新設トンネル内に残る既設構造物たる既設トンネル１の側壁２を解体する場合に本発明を適用した実施形態について説明する。尚、トンネル拡幅工事に際しては、開削工法で既設トンネル１の側壁２の外側の地山を掘削してトンネルを拡幅し、次に、新設トンネルの側壁４を構築すると共に、既設トンネル１の天井壁３の上面にモルタル５ａを介して型枠５ｂを載置し、型枠５ｂの上にコンクリートを打ち込んで新設トンネルの天井壁５を構築している。かくして、既設トンネル１の天井壁３の上面は他の構造物たる新設トンネルの天井壁５で覆われることになる。   In the following, when the tunnel widening work is performed while using the existing tunnel having the rectangular cross section indicated by 1 in FIG. 2, the side wall 2 of the existing tunnel 1 which is the existing structure remaining in the new widened tunnel is dismantled. An embodiment to which the invention is applied will be described. In the tunnel widening work, the tunnel is widened by excavating a natural ground outside the side wall 2 of the existing tunnel 1 by an open-cut method, and then the side wall 4 of the new tunnel is constructed, and the ceiling wall of the existing tunnel 1 is constructed. The ceiling 5 of the new tunnel is constructed by placing a mold 5b on the upper surface of 3 via a mortar 5a and driving concrete onto the mold 5b. Thus, the upper surface of the ceiling wall 3 of the existing tunnel 1 is covered with the ceiling wall 5 of the new tunnel which is another structure.

また、新設トンネルの天井壁５の側部には、解体物をクレーンで吊り上げて地上に搬出するための搬出口６がトンネル延在方向に所定の間隔を存して複数開設されている。尚、本実施形態では、既設トンネル１の側壁２と新設トンネルの側壁４との間の作業空間の幅が狭いため、搬出口６がその横方向全幅に亘って作業空間上に位置するように搬出口６を開設することはできず、搬出口６の横方向内側の半部は既設トンネル１の側壁２の直上部に位置する。   In addition, on the side of the ceiling wall 5 of the new tunnel, a plurality of carry-out ports 6 are provided at predetermined intervals in the tunnel extending direction for lifting the dismantled material with a crane and carrying it to the ground. In this embodiment, since the width of the work space between the side wall 2 of the existing tunnel 1 and the side wall 4 of the new tunnel is narrow, the carry-out port 6 is positioned on the work space over the entire width in the lateral direction. The carry-out port 6 cannot be opened, and a half portion on the inner side in the lateral direction of the carry-out port 6 is located immediately above the side wall 2 of the existing tunnel 1.

既設トンネル１の側壁２と新設トンネルの側壁４との間の作業空間には、図１、図２に示す如く、撤去装置１０が設けられている。撤去装置１０は、作業空間の床部に敷設したレール７に沿って側壁２の延在方向たる前後方向に移動自在な台車１１を備えている。台車１１には走行モータ１２が搭載されており、走行モータ１２で台車１１の前後一方の車輪１３をベルト１２ａを介して駆動することにより台車１１がレール７上を自走する。また、台車１１の前後にはストッパ１４が取り付けられており、台車１１をストッパ１４の操作で任意の位置に停止保持できるようにしている。   In the work space between the side wall 2 of the existing tunnel 1 and the side wall 4 of the new tunnel, a removal device 10 is provided as shown in FIGS. The removal apparatus 10 includes a carriage 11 that is movable in the front-rear direction, which is the extending direction of the side wall 2, along rails 7 laid on the floor portion of the work space. A traveling motor 12 is mounted on the carriage 11, and the carriage 11 is self-propelled on the rail 7 by driving the front and rear wheels 13 of the carriage 11 via the belt 12 a by the traveling motor 12. In addition, stoppers 14 are attached to the front and rear of the carriage 11 so that the carriage 11 can be stopped and held at an arbitrary position by operating the stopper 14.

また、台車１１上には、前後一対の支柱１５ａ，１５ａを有する門形のフレーム１５が立設されている。フレーム１５の上部には、第１可動枠１６が側壁２に接近・離反する方向、即ち、横方向に移動自在に支持されており、第１可動枠１６に、第２可動枠１７が上下方向に移動自在に支持されている。これを図３乃至図５を参照して詳述する。   Further, a portal frame 15 having a pair of front and rear columns 15 a and 15 a is erected on the carriage 11. A first movable frame 16 is supported on the upper portion of the frame 15 so as to be movable toward and away from the side wall 2, that is, in the lateral direction. The second movable frame 17 is vertically supported on the first movable frame 16. It is supported to move freely. This will be described in detail with reference to FIGS.

第１可動枠１６は、前後両端に横方向への屈曲部１６ａ，１６ａを有する平面視コ字状に形成されている。そして、各屈曲部１６ａを、各支柱１５ａに固定したチャンネル状のガイドレール１６１に、各屈曲部１６ａに横方向の間隔を存して軸着した一対のローラ１６２，１６２を介して移動自在に係合させている。ガイドレール１６１は、側壁２の外側方に向けて斜め下方に傾斜している。そのため、第１可動枠１６は、ガイドレール１６１の傾斜に従って横方向に非水平に移動する。また、各支柱１５ａにブラケット１５ｂを介して取り付けた油圧ジャッキ１６３を第１可動枠１６に連結し、この油圧ジャッキ１６３の作動で第１可動枠１６が横方向に移動されるようにしている。   The first movable frame 16 is formed in a U-shape in a plan view having laterally bent portions 16a and 16a at both front and rear ends. Each bent portion 16a is movable to a channel-shaped guide rail 161 fixed to each support column 15a via a pair of rollers 162 and 162 that are pivotally attached to each bent portion 16a with a lateral interval. Engaged. The guide rail 161 is inclined obliquely downward toward the outer side of the side wall 2. Therefore, the first movable frame 16 moves non-horizontally in the lateral direction according to the inclination of the guide rail 161. In addition, a hydraulic jack 163 attached to each column 15a via a bracket 15b is connected to the first movable frame 16, and the first movable frame 16 is moved in the lateral direction by the operation of the hydraulic jack 163.

第１可動枠１６の各屈曲部１６ａには、上下方向に長手のガイドレール１７１が固定されている。そして、第２可動枠１７の前後各端の端板部１７ａにガイドレール１７１に当接する複数のガイドローラ１７２を軸着している。そのため、第２可動枠１７はガイドレール１７１に沿って上下方向に移動する。また、第１可動枠１６の各屈曲部１６ａの先端部に取り付けた油圧ジャッキ１７３を第２可動枠１７の前後各端の端板部１７ａに連結し、この油圧ジャッキ１７３の作動で第２可動枠１７が上下方向に移動されるようにしている。   A guide rail 171 that is long in the vertical direction is fixed to each bent portion 16 a of the first movable frame 16. A plurality of guide rollers 172 that are in contact with the guide rails 171 are pivotally attached to end plate portions 17 a at the front and rear ends of the second movable frame 17. Therefore, the second movable frame 17 moves in the vertical direction along the guide rail 171. In addition, a hydraulic jack 173 attached to the tip of each bent portion 16a of the first movable frame 16 is connected to an end plate portion 17a at each of the front and rear ends of the second movable frame 17, and the second movable by the operation of the hydraulic jack 173. The frame 17 is moved in the vertical direction.

第２可動枠１７の側壁２に対向する面には、上方に屈曲する担持爪１８が上段の前後２個と下段の前後２個との計４個固設されている。尚、下段の各担持爪１８は上段のものより前後方向内方にオフセットしている。ここで、解体すべき側壁２の部分たる側壁解体部２ａの外側面には、図６に示すように、担持用ブラケット１９がアンカーボルト等により上下２段に固着される。各担持用ブラケット１９には、下向きに開口するポケット部１９ａが前後一対に形成されている。そして、第１可動枠１６の動きにより担持爪１８を側壁２に接近させてから、第２可動枠１７の動きにより担持爪１８を上昇させると、担持爪１８が下方からポケット部１９ａに挿入されて担持用ブラケット１９に係合する。尚、下段の担持用ブラケット１９は、上段の担持爪１８が干渉しないように、前後長が上段の担持用ブラケット１９より短く形成されている。   On the surface of the second movable frame 17 facing the side wall 2, four supporting claws 18 that are bent upward are fixed, that is, two front and rear two upper and two lower front and rear. In addition, each supporting claw 18 in the lower stage is offset inward in the front-rear direction from that in the upper stage. Here, on the outer surface of the side wall dismantling part 2a, which is a part of the side wall 2 to be disassembled, as shown in FIG. Each holding bracket 19 is formed with a pair of front and rear pockets 19a that open downward. Then, when the carrying claw 18 is moved up by the movement of the second movable frame 17 after the carrying claw 18 is moved closer to the side wall 2 by the movement of the first movable frame 16, the carrying claw 18 is inserted into the pocket portion 19a from below. To engage with the support bracket 19. The lower support bracket 19 is formed to have a shorter front-rear length than the upper support bracket 19 so that the upper support claws 18 do not interfere with each other.

また、フレーム１５の上部には、作業員Ｈが乗る足場２０が設けられている。更に、各支柱１５ａの上端部には、新設トンネルの側壁３の上部に取り付けたガイドレール８に複数のローラ２１ａを介して係合するローラユニット２１が取り付けられており、撤去装置１０の倒れが防止されるようにしている。また、台車１１には、油圧ジャッキ１６３，１７３用の油圧ユニット２２が搭載されている。   In addition, a scaffold 20 on which the worker H rides is provided on the upper portion of the frame 15. Further, a roller unit 21 that is engaged with a guide rail 8 that is attached to the upper portion of the side wall 3 of the new tunnel via a plurality of rollers 21a is attached to the upper end portion of each support column 15a. It is to be prevented. In addition, a hydraulic unit 22 for hydraulic jacks 163 and 173 is mounted on the carriage 11.

既設トンネル１の側壁２の解体に際しては、先ず、側壁２と天井壁３とのコーナ部となる側壁２の上端部であって搬出口６の直下に位置する部分２ａを側壁解体部としてワイヤーソー等によりブロック状に切断する。即ち、搬出口６の直下に位置する側壁上端部２ａの前後両側を切断すると共に、図５に示す如く天井壁３側の切断面Ｐ０と、下辺の切断面Ｐ１とを切断する。また、搬出口６の直下位置に移動待機させた撤去装置１０の足場２０に作業員Ｈが乗って、側壁上端部２ａの外側面に上下２段の担持用ブラケット１９を固着する。尚、側壁上端部２ａに担持用ブラケット１９を固着するブラケット固着工程は切断工程の前後何れで行っても良い。   When disassembling the side wall 2 of the existing tunnel 1, first, a wire saw that uses the portion 2 a located at the upper end of the side wall 2 that is a corner portion between the side wall 2 and the ceiling wall 3 and immediately below the carry-out port 6 as a side wall dismantling part. Cut into blocks by using a method such as That is, both the front and rear sides of the side wall upper end 2a located immediately below the carry-out port 6 are cut, and the cut surface P0 on the ceiling wall 3 side and the cut surface P1 on the lower side are cut as shown in FIG. In addition, the worker H gets on the scaffold 20 of the removal device 10 that has been moved to standby immediately below the carry-out port 6 and the upper and lower two-level support brackets 19 are fixed to the outer surface of the side wall upper end 2a. The bracket fixing process for fixing the holding bracket 19 to the side wall upper end 2a may be performed before or after the cutting process.

次に、側壁上端部２ａを側壁２の外側方に引き出して撤去する撤去工程を実行する。撤去工程では、先ず、図５に示す状態から第１可動枠１６を側壁２に接近する方向に移動させた後、第２可動枠１７を上方に移動させる。これにより、図２に示す如く、上下２段の各担持爪１８が上下２段の各担持用ブラケット１９に下方から係合する。次いで、第１可動枠１６を側壁２から離反する方向、即ち、外側方に移動させる。これによれば、側壁上端部２ａが担持用ブラケット１９を介して担持爪１８に担持された状態で側壁２の外側方に引き出される。   Next, a removal step is performed in which the side wall upper end portion 2a is pulled out to the outside of the side wall 2 and removed. In the removal step, first, the first movable frame 16 is moved in the direction approaching the side wall 2 from the state shown in FIG. 5, and then the second movable frame 17 is moved upward. Thereby, as shown in FIG. 2, the upper and lower two-stage holding claws 18 are engaged with the upper and lower two-stage holding brackets 19 from below. Next, the first movable frame 16 is moved away from the side wall 2, that is, outward. According to this, the side wall upper end portion 2 a is pulled out to the outside of the side wall 2 in a state where the side wall upper end portion 2 a is supported by the support claw 18 through the support bracket 19.

ここで、側壁上端部２ａの上面には、新設トンネルの天井壁５から型板５ｂとモルタル５ａとを介して外側方への引き出しに対する大きな抵抗力が作用する。そのため、側壁上端部２ａを外側方に水平に引き出すことが困難になる。そこで、本実施形態では、側壁上端部２ａの切断工程において、側壁上端部２ａの下辺を、その切断面Ｐ１が側壁２の外側方に向けて斜め下方に傾斜する傾斜面になるように切断している。また、上述したように、第１可動枠１６用のガイドレール１６１も側壁２の外側方に向けて斜め下方に傾斜している。そのため、第１可動枠１６の動きで側壁上端部２ａは側壁２の外側方に向けて斜め下方に引き出される。これによれば、側壁上端部２ａが新設トンネルの天井壁５の下方に引き離され、天井壁５（モルタル５ａ）からの抵抗力を受けずに側壁上端部２ａをスムーズに外側方に引き出すことができる。   Here, on the upper surface of the side wall upper end portion 2a, a large resistance is exerted against the outward pulling from the ceiling wall 5 of the new tunnel through the template 5b and the mortar 5a. Therefore, it becomes difficult to pull out the side wall upper end 2a horizontally outward. Therefore, in the present embodiment, in the cutting process of the side wall upper end portion 2a, the lower side of the side wall upper end portion 2a is cut so that the cut surface P1 becomes an inclined surface inclined obliquely downward toward the outer side of the side wall 2. ing. Further, as described above, the guide rail 161 for the first movable frame 16 is also inclined obliquely downward toward the outer side of the side wall 2. Therefore, the movement of the first movable frame 16 causes the side wall upper end portion 2 a to be drawn obliquely downward toward the outside of the side wall 2. According to this, the side wall upper end part 2a is separated below the ceiling wall 5 of the new tunnel, and the side wall upper end part 2a can be smoothly pulled out outward without receiving resistance from the ceiling wall 5 (mortar 5a). it can.

尚、側壁上端部２ａの下辺の切断面Ｐ１の傾斜角はガイドレール１６１の傾斜角より大きくすることが望ましい。これによれば、側壁上端部２ａを引き出す際にその下辺の切断面Ｐ１が切り残された側壁２の上端面から浮き、側壁上端部２ａを側壁上端面とのこじりを生ずることなく引き出すことができる。   Note that it is desirable that the inclination angle of the cut surface P1 on the lower side of the side wall upper end portion 2a is larger than the inclination angle of the guide rail 161. According to this, when the side wall upper end portion 2a is pulled out, the lower side cut surface P1 floats from the upper end surface of the left side wall 2, and the side wall upper end portion 2a can be pulled out without causing the side wall upper end surface to be twisted. it can.

以上の如くして側壁上端部２ａを引き出した後、搬出口６に張り出す型枠５ｂの部分を切除する。次いで、担持爪１８に担持される側壁上端部２ａをクレーンにより搬出口６を通して地上に引き上げて撤去する。   After the side wall upper end portion 2a is pulled out as described above, the portion of the mold 5b protruding to the carry-out port 6 is cut off. Next, the side wall upper end 2a carried by the carrying claw 18 is pulled up to the ground through the carry-out port 6 by a crane and removed.

次に、前回解体撤去した側壁上端部２ａの前後一方に隣接する部分の側壁上端部を側壁解体部として上記と同様にブロック状に切断すると共に、撤去装置１０を今回切断する側壁上端部に対応する位置に移動待機させて、この側壁上端部の外側面に上記と同様に担持用ブラケットを固着する。そして、この側壁上端部を撤去装置１０を用いて上記と同様の手順で側壁２の外側方に引き出す。次に、撤去装置１０を搬出口６の直下位置に復動させ、今回引き出した側壁上端部をクレーンにより地上に引き上げる。以上の作業を繰り返して、側壁上端部を全て解体撤去する。   Next, the side wall upper end portion adjacent to the front and rear side of the side wall upper end portion 2a which has been dismantled and removed last time is cut into a block shape in the same manner as described above, and the removal device 10 corresponds to the upper end portion of the side wall to be cut this time. The holding bracket is fixed to the outer surface of the upper end portion of the side wall in the same manner as described above. And this sidewall upper end part is pulled out to the outer side of the side wall 2 in the same procedure as the above using the removal apparatus 10. Next, the removal device 10 is moved back to a position immediately below the carry-out port 6, and the upper end portion of the side wall pulled out this time is pulled up to the ground by a crane. The above operation is repeated to dismantle and remove all the upper end portions of the side walls.

次に、撤去装置１０を一旦出坑させて、第１可動枠１６及び第２可動枠１７の配置高さを低くしたものに作り替えた後、再度撤去装置１０を作業空間に入坑させる。そして、既設トンネル１の側壁２の中間部２ｂ（図２参照）を側壁解体部としてブロック状に切断すると共に、側壁中間部２ｂの外側面に上記担持用ブラケット１９と同様の担持用ブラケットを固着する。尚、側壁中間部２ｂが安定するように、その下辺の切断面Ｐ２は図２に示す如く水平にする。   Next, after removing the removal device 10 once and making it to the one where the arrangement height of the first movable frame 16 and the second movable frame 17 is lowered, the removal device 10 is again entered into the work space. Then, the intermediate portion 2b (see FIG. 2) of the side wall 2 of the existing tunnel 1 is cut into a block shape with the side wall dismantled portion, and a supporting bracket similar to the supporting bracket 19 is fixed to the outer surface of the side wall intermediate portion 2b. To do. In order to stabilize the side wall intermediate portion 2b, the lower cut surface P2 is horizontal as shown in FIG.

次に、第１可動枠１６の動きで担持爪１８を側壁２に接近させた後、第２可動枠１７の動きで担持爪１８を上昇させて、担持爪１８を担持用ブラケットに下方から係合させると共に、引き続き担持爪１８を上昇させて、側壁中間部２ｂを持ち上げる。次いで、第１可動枠１６を側壁２から離反する方向に移動させ、側壁中間部２ｂを担持爪１８により担持用ブラケットを介して担持した状態で側壁２の外側方に引き出す。この場合、第１可動枠１６が外側方に向けて斜め下方に移動することから側壁中間部２ｂが若干下降するが、上記の如く側壁中間部２ｂを予め持ち上げているため、側壁中間部２ｂが切り残された側壁２に当たることはない。尚、第１可動枠１６を横方向に水平に移動するように作り替え、側壁中間部２ｂを外側方に水平に引き出すようにしても良い。その後、撤去装置１０を搬出口６の直下位置に移動させ、今回引き出した側壁中間部２ｂをクレーンにより搬出口６を通して地上に引き上げる。そして、以上の作業を繰り返して、側壁中間部を全て解体撤去する。   Next, after the carrying claw 18 is brought close to the side wall 2 by the movement of the first movable frame 16, the carrying claw 18 is raised by the movement of the second movable frame 17, and the carrying claw 18 is engaged with the carrying bracket from below. At the same time, the supporting claws 18 are continuously raised to raise the side wall middle portion 2b. Next, the first movable frame 16 is moved away from the side wall 2, and the side wall intermediate portion 2 b is pulled out to the outside of the side wall 2 while being supported by the supporting claws 18 via the supporting bracket. In this case, since the first movable frame 16 moves obliquely downward toward the outside, the side wall intermediate portion 2b is slightly lowered. However, since the side wall intermediate portion 2b is lifted in advance as described above, the side wall intermediate portion 2b It does not hit the side wall 2 that is left uncut. The first movable frame 16 may be reshaped so as to move horizontally in the lateral direction, and the side wall intermediate portion 2b may be pulled out horizontally outward. Thereafter, the removal device 10 is moved to a position directly below the carry-out port 6, and the side wall intermediate portion 2b pulled out this time is pulled up to the ground through the carry-out port 6 by a crane. And the above operation | work is repeated and all the side wall intermediate parts are dismantled and removed.

次に、撤去装置１０を一旦出坑させて、第１可動枠１６及び第２可動枠１７の配置高さを更に低くしたものに作り替えた後、再度撤去装置１０を作業空間に入坑させる。そして、既設トンネル１の側壁２の下部２ｃ（図２参照）を側壁解体部としてブロック状に切断すると共に、側壁下部２ｃの外側面に上記担持用ブラケット１９と同様の担持用ブラケットを固着する。尚、側壁下部２ｃの下辺の切断面Ｐ３も図２に示す如く水平にする。   Next, after removing the removal device 10 once and remodeling the first movable frame 16 and the second movable frame 17 to have a lower arrangement height, the removal device 10 is again entered into the work space. . Then, the lower part 2c (see FIG. 2) of the side wall 2 of the existing tunnel 1 is cut into a block shape as a side wall dismantling part, and a supporting bracket similar to the supporting bracket 19 is fixed to the outer surface of the side wall lower part 2c. The cut surface P3 on the lower side of the side wall lower portion 2c is also horizontal as shown in FIG.

次に、第１可動枠１６の動きで担持爪１８を側壁２に接近させた後、第２可動枠１７の動きで担持爪１８を上昇させて、担持爪１８を担持用ブラケットに下方から係合させると共に、引き続き担持爪１８を上昇させて、側壁下部２ｃを持ち上げる。次いで、第１可動枠１６を側壁２から離反する方向に移動させて、側壁下部２ｃを担持爪１８により担持用ブラケットを介して担持した状態で側壁２の外側方に引き出す。その後、撤去装置１０を搬出口６の直下位置に移動させ、今回引き出した側壁下部２ｃをクレーンにより搬出口６を通して地上に引き上げる。そして、以上の作業を繰り返して、側壁下部を全て解体撤去する。   Next, after the carrying claw 18 is brought close to the side wall 2 by the movement of the first movable frame 16, the carrying claw 18 is raised by the movement of the second movable frame 17, and the carrying claw 18 is engaged with the carrying bracket from below. At the same time, the holding claw 18 is continuously raised to lift the side wall lower portion 2c. Next, the first movable frame 16 is moved away from the side wall 2, and the side wall lower portion 2 c is pulled out to the outside of the side wall 2 while being supported by the supporting claws 18 via the supporting bracket. Thereafter, the removal device 10 is moved to a position directly below the carry-out port 6, and the side wall lower portion 2 c pulled out this time is pulled up to the ground through the carry-out port 6 by a crane. And the above operation | work is repeated and all side wall lower parts are dismantled and removed.

上述した本実施形態の解体方法によれば、既設トンネル１の側壁２をこれと新設トンネルの側壁４との間の作業空間に坑入したブレーカで破砕する場合と異なり、既設トンネル１内に破砕片が落下しないため、側壁２の内側面に破砕片落下防止のための大掛かりな養生を施す必要がなく、工費を安くできる。更に、撤去装置１０の横幅はブレーカに比し小さく、ブレーカを坑入できない幅狭の作業空間でも撤去装置１０を用いて効率良く側壁２の解体撤去作業を行うことができる。   According to the dismantling method of the present embodiment described above, the side wall 2 of the existing tunnel 1 is crushed in the existing tunnel 1 unlike the case where the side wall 2 of the existing tunnel 1 is crushed by a breaker that has entered the work space between the side wall 4 and the new tunnel. Since the piece does not fall, it is not necessary to apply a large-scale curing for preventing the fall of the shredded piece on the inner surface of the side wall 2, and the construction cost can be reduced. Further, the lateral width of the removal device 10 is smaller than that of the breaker, and the side wall 2 can be efficiently dismantled and removed using the removal device 10 even in a narrow work space where the breaker cannot be tunneled.

尚、既設トンネル１の天井壁３は、側壁２の解体後に、上記特許文献１に記載の方法と同様の方法で解体すれば良い。   The ceiling wall 3 of the existing tunnel 1 may be disassembled by a method similar to the method described in Patent Document 1 after the side wall 2 is disassembled.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、上記実施形態の撤去装置１０では、台車１１上のフレーム１５に支持される第１可動枠１６を側壁２に接近・離反する方向に移動自在としたが、第１可動枠１６を上下方向に移動自在とし、第１可動枠１６に支持される第２可動枠１７を側壁２に接近・離反する方向に移動自在としても良い。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the removal device 10 of the above-described embodiment, the first movable frame 16 supported by the frame 15 on the carriage 11 is movable in the direction approaching / separating from the side wall 2. The second movable frame 17 supported by the first movable frame 16 may be movable in a direction approaching / separating from the side wall 2.

また、上記実施形態では、第１可動枠１６を側壁２の外側方に向けて斜め下方に傾斜した方向に移動するように構成したが、第１可動枠１６を水平に移動するように構成することも可能である。この場合は、第１可動枠１６を外側方に水平に移動させつつ第２可動枠１７を下方に移動させるという第１と第２の両可動枠１６，１７の合成動作で側壁上端部２ａを外側方に向けて斜め下方に引き出すことができる。但し、第１可動枠１６の外側方への移動に対し第２可動枠１７の下方への移動が早すぎると、担持爪１８が担持用ブラケット１９から外れてしまい、側壁上端部２ａをうまく引き出せなくなる。一方、上記実施形態では、第１可動枠１６の単独動作で担持爪１８を外側方に向けて斜め下方に傾斜した所定の傾斜方向に移動でき、上記の不具合は生じない。   Moreover, in the said embodiment, although comprised so that the 1st movable frame 16 might be moved to the direction inclined diagonally downward toward the outer side of the side wall 2, it is comprised so that the 1st movable frame 16 may be moved horizontally. It is also possible. In this case, the side wall upper end portion 2a is moved by the combined operation of the first and second movable frames 16, 17 in which the second movable frame 17 is moved downward while the first movable frame 16 is moved horizontally outward. It can be pulled out diagonally downward. However, if the movement of the second movable frame 17 downward is too early relative to the movement of the first movable frame 16 outward, the carrying claws 18 come off the carrying bracket 19 and the side wall upper end 2a can be pulled out well. Disappear. On the other hand, in the above-described embodiment, the carrying claw 18 can be moved in a predetermined inclination direction inclined obliquely downward toward the outer side by the single operation of the first movable frame 16, and the above-described problems do not occur.

また、上記実施形態は、既設トンネル１の側壁２の解体に本発明を適用したものであるが、既設トンネル以外の既設構造物の側壁の解体にも同様に本発明を適用できる。   Moreover, although the said embodiment applies this invention to the demolition of the side wall 2 of the existing tunnel 1, this invention is applicable similarly to the demolition of the side wall of existing structures other than an existing tunnel.

本発明の実施形態の撤去装置の正面図。The front view of the removal apparatus of embodiment of this invention. 図１のＩＩ−ＩＩ線切断側面図。The II-II line cutting | disconnection side view of FIG. 図１の撤去装置の上部の拡大正面図。The enlarged front view of the upper part of the removal apparatus of FIG. 図３のＶＩ−ＶＩ線切断平面図。FIG. 6 is a plan view taken along line VI-VI in FIG. 3. 図３のＶ−Ｖ線切断側面図。FIG. 5 is a side view taken along line VV in FIG. 側壁解体部に担持用ブラケットを固着した状態の斜視図。The perspective view of the state which fixed the bracket for carrying to the side wall demolition part.

符号の説明Explanation of symbols

１…既設トンネル（既設構造物）、２…側壁、２ａ…側壁上端部、３…天井壁、５…新設トンネルの天井壁（他の構造物）、１０…撤去装置、１１…台車、１６…第１可動枠、１７…第２可動枠、１８…担持爪、１９…担持用ブラケット。   DESCRIPTION OF SYMBOLS 1 ... Existing tunnel (existing structure), 2 ... Side wall, 2a ... Side wall upper end part, 3 ... Ceiling wall, 5 ... Ceiling wall (other structure) of new tunnel, 10 ... Removal apparatus, 11 ... Dolly, 16 ... 1st movable frame, 17 ... 2nd movable frame, 18 ... carrying claw, 19 ... bracket for carrying.

Claims (4)

外側方に作業空間を介して他の構造物が存在する既設構造物の側壁を解体する方法であって、解体すべき側壁の部分である側壁解体部をブロック状に切断する切断工程と、側壁解体部の外側面に担持用ブラケットを固着するブラケット固着工程と、担持用ブラケットに担持爪を係合させ、担持ブラケットに係合させた状態で担持爪を油圧ジャッキで側壁から離反する方向に移動させることにより、ブロック状に切断された側壁解体部を担持用ブラケットを介して担持した状態で側壁の外側方に引き出して撤去する撤去工程とを備えることを特徴とする既設構造物の側壁解体方法。 A method of disassembling a side wall of an existing structure in which another structure exists outside through a work space, a cutting step of cutting a side wall dismantling part that is a part of the side wall to be disassembled into a block shape, and the side wall A bracket fixing process for fixing the holding bracket to the outer surface of the dismantling part, and the holding claw is engaged with the holding bracket, and the holding claw is moved in a direction away from the side wall with a hydraulic jack in a state of being engaged with the holding bracket. And a removal step of pulling out and removing the side wall dismantling part cut into a block shape to the outside of the side wall in a state of being supported via the supporting bracket. . 請求項１記載の既設構造物の側壁解体方法であって、前記既設構造物が他の構造物で上面が覆われた天井壁を有し、前記側壁解体部が前記側壁と天井壁とのコーナ部となる側壁上端部である場合において、前記切断工程で側壁上端部の下辺を側壁の外側方に向けて斜め下方に傾斜する傾斜面に沿って切断し、前記撤去工程で側壁上端部を側壁の外側方に向けて斜め下方に引き出すことを特徴とする既設構造物の側壁解体方法。   2. The method for disassembling a side wall of an existing structure according to claim 1, wherein the existing structure has a ceiling wall whose upper surface is covered with another structure, and the side wall dismantling part is a corner between the side wall and the ceiling wall. The lower end of the side wall upper end portion is cut along an inclined surface inclined obliquely downward toward the outer side of the side wall in the cutting step, and the upper end portion of the side wall is changed to the side wall in the removal step. A method for disassembling a side wall of an existing structure, characterized by being drawn obliquely downward toward the outside of the wall. 請求項１又は２記載の既設構造物の側壁解体方法で使用する側壁解体部の撤去装置であって、前記側壁の外側方に側壁の延在方向に移動自在に設けられた台車と、台車上に側壁に接近・離反する方向と上下方向との一方に移動自在に支持された第１可動枠と、第１可動枠に側壁に接近・離反する方向と上下方向との他方に移動自在に支持された第２可動枠と、第２可動枠に設けられた、前記担時用ブラケットに下方から係合可能な担持爪とを備えることを特徴とする側壁解体部の撤去装置。   An apparatus for removing a side wall dismantling part used in the side wall disassembling method for an existing structure according to claim 1 or 2, wherein the carriage is provided on the outer side of the side wall so as to be movable in the extending direction of the side wall, The first movable frame is movably supported in one of a direction approaching / separating from the side wall and the vertical direction, and the first movable frame is movably supported in the other direction of approaching / separating from the side wall and the vertical direction. An apparatus for removing a side wall dismantling part, comprising: the second movable frame formed on the second movable frame; and a holding claw provided on the second movable frame and engageable with the bracket for carrying from below. 前記第１可動枠と前記第２可動枠とのうち前記側壁に接近・離反する方向に移動自在な一方の可動枠は、側壁の外側方に向けて斜め下方に傾斜した方向に移動するように構成されていることを特徴とする請求項３記載の側壁解体部の撤去装置。   One of the first movable frame and the second movable frame, which is movable in a direction approaching / separating from the side wall, moves in a direction inclined obliquely downward toward the outer side of the side wall. It is comprised, The removal apparatus of the side wall demolition part of Claim 3 characterized by the above-mentioned.
JP2006049716A 2006-02-27 2006-02-27 Side wall dismantling method for existing structure and side wall dismantling part removal device Expired - Fee Related JP4708215B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0323415A (en) * 1989-06-20 1991-01-31 Canon Inc Optical low-pass filter
JPH0693651A (en) * 1992-09-11 1994-04-05 Daiichi Daiyamondo Koji Kk Method for demolishing underground structure
JPH09317211A (en) * 1996-05-27 1997-12-09 Ohbayashi Corp Vehicle for removing and carrying structure and method of removing underground structure using the vehicle
JPH108741A (en) * 1996-06-24 1998-01-13 Maeda Corp Withdrawing device for concrete wall cut-off block
JPH11303417A (en) * 1998-04-23 1999-11-02 Dymosha:Kk Cutting and removing method of column for vibration isolation
JP2003064979A (en) * 2001-08-24 2003-03-05 Ohbayashi Corp Enlarging method of existing tunnel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0323415A (en) * 1989-06-20 1991-01-31 Canon Inc Optical low-pass filter
JPH0693651A (en) * 1992-09-11 1994-04-05 Daiichi Daiyamondo Koji Kk Method for demolishing underground structure
JPH09317211A (en) * 1996-05-27 1997-12-09 Ohbayashi Corp Vehicle for removing and carrying structure and method of removing underground structure using the vehicle
JPH108741A (en) * 1996-06-24 1998-01-13 Maeda Corp Withdrawing device for concrete wall cut-off block
JPH11303417A (en) * 1998-04-23 1999-11-02 Dymosha:Kk Cutting and removing method of column for vibration isolation
JP2003064979A (en) * 2001-08-24 2003-03-05 Ohbayashi Corp Enlarging method of existing tunnel

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