JP2002275886A - Method of constructing cross part of underground continuous wall - Google Patents
Method of constructing cross part of underground continuous wallInfo
- Publication number
- JP2002275886A JP2002275886A JP2001078079A JP2001078079A JP2002275886A JP 2002275886 A JP2002275886 A JP 2002275886A JP 2001078079 A JP2001078079 A JP 2001078079A JP 2001078079 A JP2001078079 A JP 2001078079A JP 2002275886 A JP2002275886 A JP 2002275886A
- Authority
- JP
- Japan
- Prior art keywords
- wall
- continuous wall
- underground continuous
- intersection
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は互いに交差する2
方向の地中連続壁中に耐力向上のために鋼製連壁部材を
挿入する場合に、交差部における鋼製連壁部材の連続性
を確保するための地中連続壁交差部の施工方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention
Construction method of underground continuous wall intersection to ensure continuity of steel continuous wall members at intersections when steel connecting members are inserted in direction of underground continuous walls to improve strength Things.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】切削刃
を有する無端チェーンをカッターポストの周囲で循環さ
せながら、カッターポストを地中に挿入したまま横行さ
せると同時に、カッターポストの下端部、もしくは地表
面付近から固化材液等の注入液を吐出して所定の壁厚の
地中連続壁を構築する方法は例えば特開平10−159084
号,特開平11−117349号等のようにいずれも直線状の地
中連続壁を構築する場合に限られ、角度が付く地中連続
壁を連続して施工することはできない。2. Description of the Related Art While circulating an endless chain having a cutting blade around a cutter post, the cutter post is traversed while being inserted into the ground, and at the same time, the lower end of the cutter post, or A method of constructing an underground continuous wall having a predetermined wall thickness by discharging an injection liquid such as a solidifying material liquid from the vicinity of the ground surface is disclosed in, for example,
And Japanese Patent Application Laid-Open No. 11-117349 are all limited to the construction of a straight underground continuous wall, and an underground continuous wall having an angle cannot be continuously constructed.
【0003】角度が付く地中連続壁を構築する場合に
は、交差部において一旦、地中からカッターポスト全体
を引き抜き、その状態で施工装置と共にカッターポスト
の向きを変え、改めて新規に連続壁の構築を開始する場
合と同様にカッターポストを地中に建て込む、という要
領で行われ、カッターポストを地中に挿入したまま方向
転換することは難しいため、交差部を含め、地中連続壁
の壁厚は各方向で等しくなる。In order to construct an underground continuous wall having an angle, the entire cutter post is once pulled out from the underground at the intersection, and the cutter post is changed together with the construction apparatus in that state, and a new continuous wall is newly formed. The cutter post is buried underground in the same way as when starting construction.It is difficult to change the direction with the cutter post inserted in the ground, so it is difficult to change the direction of the underground wall including the intersection. The wall thickness will be equal in each direction.
【0004】地中連続壁の内部に補強のための芯材とし
て、両側に継手部を有するH形断面等の鋼製連壁部材を
挿入する場合、地中連続壁の壁厚は鋼製連壁部材の継手
部を含めた成(弱軸方向の高さ)で決まることから、あ
る方向の地中連続壁は交差する方向の地中連続壁との交
差部までの全長に亘り、鋼製連壁部材の成に応じた一定
の壁厚で構築されるため、交差部に鋼製連壁部材を挿入
することが難しくなっている。[0004] When a steel continuous wall member having an H-shaped cross section having joints on both sides is inserted as a core material for reinforcement inside the underground continuous wall, the wall thickness of the underground continuous wall is made of steel. Because it is determined by the composition (height in the weak axis direction) including the joints of the wall members, the underground continuous wall in a certain direction is made of steel over the entire length up to the intersection with the underground continuous wall in the crossing direction. Since it is constructed with a constant wall thickness according to the structure of the continuous wall member, it is difficult to insert the steel continuous wall member at the intersection.
【0005】例えば2方向の地中連続壁が直交する交差
部において各方向の鋼製連壁部材を連続させるには、交
差部の鋼製連壁部材に、幅方向の片側と成方向の片側の
2方向に継手部を持たせる必要があるが、成方向にも継
手部を有することで交差部以外の部分に挿入される鋼製
連壁部材より成が大きくなるため、地中連続壁の壁厚が
交差部まで一定であれば、交差部中に2方向に継手部を
持つ鋼製連壁部材を挿入することができない。For example, in order to make the steel connecting wall members in each direction continuous at the intersection where the underground continuous walls in two directions are orthogonal to each other, one side in the width direction and one side in the forming direction are attached to the steel connecting wall members at the intersection. It is necessary to have joints in the two directions, but since the joints also have a joint in the forming direction, the composition is larger than the steel continuous wall member inserted in the part other than the intersection, so the underground continuous wall If the wall thickness is constant up to the intersection, a steel continuous wall member having joints in two directions cannot be inserted into the intersection.
【0006】仮に成方向の継手部の突出を抑える等によ
り、先行する方向の地中連続壁の交差部まで鋼製連壁部
材を挿入することができたとしても、先行する地中連続
壁の施工終了から、交差する方向の地中連続壁の施工開
始までに時間が経過するような場合、後から施工される
地中連続壁の構築を開始し、交差部まで到達した時点
で、先行する地中連続壁の交差部におけるソイルセメン
トが硬化していれば、後から施工される地中連続壁側に
おいて交差部に面する鋼製連壁部材を挿入することがで
きなくなる可能性がある。Even if the steel continuous wall member can be inserted to the intersection of the underground continuous wall in the preceding direction by suppressing the protrusion of the joint in the forming direction, etc. In the case where time elapses from the end of construction to the start of construction of the underground continuous wall in the crossing direction, construction of the underground continuous wall to be constructed later is started, and when it reaches the intersection, it precedes If the soil cement at the intersection of the underground continuous wall is hardened, the steel continuous wall member facing the intersection may not be able to be inserted on the underground continuous wall side to be constructed later.
【0007】このように地中連続壁の壁厚の面からも、
施工手順の面からも、後から施工される地中連続壁に挿
入される鋼製連壁部材を交差部の鋼製連壁部材に接続す
ることが難しくなっており、現状では図9に示すように
2方向の内、1方向の鋼製連壁部材を交差部まで挿入
し、他の方向の鋼製連壁部材を交差部の鋼製連壁部材に
突き合わせる形で挿入するしかなく、交差部における鋼
製連壁部材の連続性が確保されていない。As described above, from the viewpoint of the thickness of the underground continuous wall,
From the viewpoint of the construction procedure, it is difficult to connect the steel continuous wall member inserted into the underground continuous wall to be subsequently constructed to the steel continuous wall member at the intersection. In one of the two directions, the steel connecting wall member in one direction is inserted up to the intersection, and the steel connecting member in the other direction must be inserted in a form to abut against the steel connecting member at the intersection, The continuity of the steel continuous wall member at the intersection is not ensured.
【0008】交差部は最も応力条件の厳しい箇所である
にも拘わらず、2方向の鋼製連壁部材が接続されないこ
とで構造的な弱点となり、交差部における2方向の鋼製
連壁部材が分離し易いため、亀裂が発生し、破断する危
険性が高い。[0008] Although the intersection is the location where the stress conditions are the most severe, the two-way steel continuous wall member is not connected, and thus becomes a structural weak point. Since it is easily separated, there is a high risk of cracking and breaking.
【0009】この発明は上記背景より、交差部における
構造的な弱点を解消し得る地中連続壁の施工方法を提案
するものである。In view of the above background, the present invention proposes a method of constructing an underground continuous wall which can eliminate structural weak points at intersections.
【0010】[0010]
【課題を解決するための手段】本発明では交差する2方
向の内の1方向の地中連続壁を他の方向の地中連続壁と
の交差部の手前付近まで構築した後、その地中連続壁に
連続し、その壁厚より大きい壁厚の拡幅壁を、他の方向
の地中連続壁に交わる位置まで構築することにより、2
方向に継手部を持つ鋼製連壁部材の交差部への挿入を可
能にする。According to the present invention, an underground continuous wall in one of two intersecting directions is constructed up to near an intersection with an underground continuous wall in another direction, and then the underground continuous wall is constructed. By constructing a widened wall continuous with the continuous wall and having a wall thickness larger than the wall thickness to a position where the widened wall intersects the underground continuous wall in the other direction, 2
A steel connecting wall member having a joint in the direction can be inserted into the intersection.
【0011】拡幅壁の壁厚は経済性の面からは少なくと
も請求項3に記載のように2方向に継手部を有する鋼製
連壁部材を挿入できる程度の幅を持てば足りるが、交差
部に挿入される鋼製連壁部材に、その挿入時の安定性確
保のために、継手部の反対側に突起を持たせた場合は継
手部と突起を含めた鋼製連壁部材の幅と成に対応した大
きさが与えられる。The wall thickness of the widening wall should be at least large enough to insert a steel continuous wall member having a joint in two directions as described in claim 3 from the viewpoint of economy. If the steel connecting wall member to be inserted into the joint is provided with a projection on the opposite side of the joint to ensure stability during insertion, the width of the steel connecting wall member including the joint and the projection The size corresponding to the result is given.
【0012】交差する地中連続壁は請求項2に記載のよ
うに直交する場合の他、直交しない場合もある。直交し
ない場合は地中連続壁の交差する角度に応じた形の交差
部用の鋼製連壁部材が用意される。[0012] The intersecting underground continuous wall may be orthogonal as described in claim 2 or may not be orthogonal. If they are not orthogonal, a steel continuous wall member for the intersection having a shape corresponding to the angle at which the underground continuous wall intersects is prepared.
【0013】拡幅壁の構築はそれまでの地中連続壁を構
築した切削刃を装着した無端チェーンを循環させなが
ら、カッターポストを地中に挿入したまま横行させる作
業を地中連続壁の幅方向にずらしながら繰り返すことに
よっても行われるが、請求項4に記載のように無端チェ
ーンの一部の切削刃を一旦、幅方向両端間距離の大きい
拡幅切削刃に交換して行えば、カッターポスト全体を地
上に引き上げることなく、カッターポストの一度の横行
によって拡幅壁を構築できるため、施工効率が向上す
る。The widening wall is constructed by circulating an endless chain equipped with a cutting blade on which an underground continuous wall has been constructed, and traversing the cutter post while inserting it into the ground in the width direction of the underground continuous wall. It is also possible to repeat the process by shifting the cutting blade of the endless chain as described in claim 4 once to a wide-width cutting blade having a large distance between both ends in the width direction. Since the widened wall can be constructed by one traversing of the cutter post without raising the floor to the ground, construction efficiency is improved.
【0014】拡幅壁内への鋼製連壁部材の挿入は作業性
の面からは、硬化したソイルセメントを破砕しながら鋼
製連壁部材を挿入せずに済むよう、請求項5に記載のよ
うに拡幅壁のソイルセメントの硬化前に行われる。拡幅
壁が2本の鋼製連壁部材を挿入できる長さを持つ場合
は、交差部に挿入される鋼製連壁部材の挿入時の鉛直性
を確保と挿入のし易さの面から、あるいは2方向の鋼製
連壁部材の位置決めのし易さの面から、請求項6に記載
のように拡幅壁内において交差部寄りの反対側に鋼製連
壁部材を挿入した後、それに接続するように交差部に2
方向に継手部を有する交差部用の鋼製連壁部材が挿入さ
れる。The steel connecting wall member according to claim 5, wherein the steel connecting wall member is inserted into the widening wall so that the steel connecting wall member is not inserted while crushing the hardened soil cement from the viewpoint of workability. This is done before the hardening of the wide-walled soil cement. If the widening wall has a length that allows the insertion of two steel connecting wall members, from the viewpoint of securing the verticality and easy insertion of the steel connecting wall member inserted at the intersection, Alternatively, in order to easily position the steel continuous wall member in two directions, the steel continuous wall member is inserted on the opposite side of the widened wall near the intersection in the widened wall, and then connected thereto. 2 at the intersection as
A steel connecting wall member for a crossing portion having a joint portion in a direction is inserted.
【0015】特に請求項7に記載のように拡幅壁に交差
する方向の地中連続壁の構築と、その地中連続壁への鋼
製連壁部材の挿入をその全長の内の中途から、拡幅壁側
へ向けて施工すれば、地中連続壁がL形に交差する場合
や、箱形に周回する場合も後から施工される地中連続壁
の構築を開始し、交差部まで到達した時点で、先行する
地中連続壁の交差部におけるソイルセメントが硬化して
いる事態を回避することができる。In particular, the construction of the underground continuous wall in the direction intersecting with the widening wall and the insertion of the steel continuous wall member into the underground continuous wall as described in claim 7 are performed from the middle of the entire length thereof. If the construction is performed toward the widening wall side, the construction of the underground continuous wall to be constructed later is started even when the underground continuous wall intersects in an L-shape or turns around in a box shape, and reaches the intersection. At this point, the situation in which the soil cement at the intersection of the preceding underground diaphragm wall has hardened can be avoided.
【0016】この結果、拡幅壁に交差する方向の地中連
続壁中に鋼製連壁部材を挿入し、交差部の鋼製連壁部材
に接続するときに、交差部に挿入されている鋼製連壁部
材の継手部回りのソイルセメントを破砕する必要がな
く、交差部に挿入されている鋼製連壁部材とそれに接続
される鋼製連壁部材との接続を容易に行うことが可能に
なる。As a result, when the steel continuous wall member is inserted into the underground continuous wall in the direction intersecting with the widening wall, and the steel continuous wall member is connected to the steel continuous wall member at the intersection, the steel inserted into the intersection is used. There is no need to crush soil cement around the joint part of the continuous wall member, and the steel continuous wall member inserted at the intersection and the steel continuous wall member connected to it can be easily connected. become.
【0017】[0017]
【発明の実施の形態】この発明は図1,図2に示すよう
に互いに交差する2方向の地中連続壁1,2の交差部30
において、交差する2方向の内の1方向の地中連続壁1
を他の方向の地中連続壁2の手前付近まで構築した後、
その地中連続壁1に連続し、その壁厚より大きい壁厚の
拡幅壁3を、他の方向の地中連続壁2に交わる位置まで
構築する方法である。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, the present invention relates to an intersection 30 between two underground continuous walls 1 and 2 which intersect each other.
, The underground continuous wall 1 in one of two intersecting directions
To the vicinity of the underground continuous wall 2 in the other direction,
This is a method of constructing a widened wall 3 continuous with the underground continuous wall 1 and having a wall thickness larger than the wall thickness up to a position where the widened wall 3 intersects the underground continuous wall 2 in another direction.
【0018】地中連続壁1は図6に示すように切削刃6
を有する無端チェーン7をカッターポスト8の周囲で循
環させながら、カッターポスト8を地中に挿入したまま
横行させると同時に、カッターポスト8の下端部、もし
くは地表面付近から所定濃度のセメントミルク等の固化
材液、またはベントナイト等の粘土を含んだ水溶性の液
や低濃度の固化材液等の注入液を吐出することにより構
築される。The underground continuous wall 1 has a cutting blade 6 as shown in FIG.
While circulating the endless chain 7 having the shape around the cutter post 8, the cutter post 8 is traversed while being inserted into the ground, and at the same time, a predetermined concentration of cement milk or the like is fed from the lower end of the cutter post 8 or near the ground surface. It is constructed by discharging an injecting liquid such as a solidifying liquid, a water-soluble liquid containing clay such as bentonite, or a low-concentration solidifying liquid.
【0019】ベントナイト等を含む水溶性の液、もしく
は低濃度の固化材液は地中連続壁1や拡幅壁3中に鋼製
連壁部材4,5を挿入するまでの間に、掘削土との混合
物を硬化させない目的で使用されるが、鋼製連壁部材
4,5の挿入後に地中連続壁1や拡幅壁3を硬化させる
必要から、鋼製連壁部材4,5の挿入に先立ち、ソイル
セメント構築用の固化材液と置換され、攪拌・混合が行
われる。A water-soluble liquid containing bentonite or the like or a low-concentration solidified material liquid is excavated soil before the steel continuous wall members 4 and 5 are inserted into the underground continuous wall 1 or the widened wall 3. However, since the underground continuous wall 1 and the widened wall 3 need to be hardened after the steel continuous wall members 4 and 5 are inserted, the mixture is used before the steel continuous wall members 4 and 5 are inserted. Is replaced with a solidifying material liquid for soil cement construction, and stirring and mixing are performed.
【0020】カッターポスト8は施工装置9とカッター
ポスト8との間に架設された油圧シリンダ10の伸長に伴
い、架台11に沿って施工装置9に対して移動することに
より横行する。The cutter post 8 traverses by moving the cutter post 8 along the gantry 11 with respect to the construction device 9 as the hydraulic cylinder 10 provided between the construction device 9 and the cutter post 8 extends.
【0021】カッターポスト8は施工装置9の進行方向
前方側の端部まで移動した後は、注入液の吐出を停止
し、カッターポスト8が地中に挿入された状態のまま、
クローラ等の走行装置12によって施工装置9が移動しな
がら、油圧シリンダ10が収縮することにより進行方向後
方側の端部まで移動した状態に戻る。再度、注入液の吐
出を開始し、油圧シリンダ10を伸長させることによって
カッターポスト8が横行し、カッターポスト8の横行と
施工装置9の移動の繰り返しによって地中連続壁1が構
築される。After the cutter post 8 has moved to the front end in the traveling direction of the construction device 9, the discharge of the injection liquid is stopped, and the cutter post 8 is inserted into the ground while the cutter post 8 is inserted into the ground.
While the construction device 9 is being moved by the traveling device 12 such as a crawler, the hydraulic cylinder 10 is contracted to return to a state where the hydraulic cylinder 10 has been moved to the rear end in the traveling direction. The discharge of the injection liquid is started again, and the cutter post 8 traverses by extending the hydraulic cylinder 10. The underground continuous wall 1 is constructed by repeating the traverse of the cutter post 8 and the movement of the construction device 9.
【0022】注入液はカッターポスト8の下端部から吐
出する場合は、図7に示すようにカッターポスト8に軸
方向に形成、もしくは添設されている供給路13を通じて
カッターポスト8の下端部の吐出口14から吐出する。無
端チェーン7は駆動ローラ15とアイドルローラ16との間
に掛け渡され、駆動ローラ15の回転によってカッターポ
スト8の周囲をいずれの向きにも循環する。When the liquid to be injected is discharged from the lower end of the cutter post 8, as shown in FIG. 7, the lower end of the cutter post 8 is formed through a supply path 13 formed in the cutter post 8 in the axial direction or attached thereto. It is discharged from the discharge port 14. The endless chain 7 is stretched between a driving roller 15 and an idle roller 16 and circulates around the cutter post 8 in any direction by the rotation of the driving roller 15.
【0023】切削刃6を装着した無端チェーン7による
地中連続壁1の構築が図1−(b) に示すように拡幅壁3
の区間に入ったところまで行われた時点で、同一の切削
刃6による拡幅壁3の構築、または(c) ,(d) に示すよ
うに切削刃6をそれより幅方向両端間距離の大きい拡幅
切削刃60に交換して拡幅壁3の構築が行われる。The construction of the underground continuous wall 1 by the endless chain 7 to which the cutting blades 6 are attached is performed as shown in FIG.
At the point where the section has been entered, the widening wall 3 is constructed by the same cutting blade 6, or the cutting blade 6 is set to have a larger distance between both ends in the width direction as shown in FIGS. The widening wall 3 is constructed in place of the widening cutting blade 60.
【0024】拡幅壁3の壁厚は交差部30に挿入される鋼
製連壁部材5の幅と成、及び継手部5a,5bの形状によっ
て決まるため、その拡幅壁3の壁厚に応じて交換される
拡幅切削刃60の幅方向両端間距離は任意に設定される。The wall thickness of the widening wall 3 is determined by the width and composition of the steel continuous wall member 5 inserted into the intersection 30, and the shape of the joints 5a and 5b. The distance between both ends in the width direction of the widened cutting blade 60 to be replaced is arbitrarily set.
【0025】当初の切削刃6を装着したまま拡幅壁3を
構築する場合は(b) に2点鎖線で示すように拡幅壁3の
全区間で幅方向にずらしながらカッターポスト8を往復
させることにより拡幅壁3が構築される。When the widening wall 3 is to be constructed with the original cutting blade 6 mounted, the cutter post 8 is reciprocated in the entire section of the widening wall 3 while being shifted in the width direction as shown by the two-dot chain line in FIG. Thereby, the widening wall 3 is constructed.
【0026】切削刃6を拡幅切削刃60に交換する場合は
(c) に示すように拡幅壁3の構築開始位置で、もしくは
(c) に2点鎖線で示すように拡幅壁3の構築終了位置で
切削刃6が拡幅切削刃60に交換される。When replacing the cutting blade 6 with the widened cutting blade 60,
at the construction start position of the widened wall 3 as shown in (c), or
As shown by the two-dot chain line in (c), the cutting blade 6 is replaced with the widened cutting blade 60 at the construction end position of the widened wall 3.
【0027】拡幅切削刃60に交換する際には、交差部30
の鋼製連壁部材5の挿入が行われる時点まで、あるいは
鋼製連壁部材5に接続される、交差する方向の地中連続
壁2中への鋼製連壁部材4の挿入が行われる時点まで、
拡幅壁3の硬化が始まらないよう、固化材液がベントナ
イト等の粘土を混合した水溶性の液、もしくは低濃度の
固化材液に切り替えられ、(c) ,(d) に破線で示す地中
連続壁1と拡幅壁3との境界より拡幅壁3側の固化材濃
度が低下させられる。When replacing the cutting blade 60 with the widened cutting blade 60,
Until the insertion of the steel continuous wall member 5 is performed, or the steel continuous wall member 4 is inserted into the underground continuous wall 2 in the cross direction connected to the steel continuous wall member 5. Until the point
In order to prevent the hardening of the widening wall 3 from starting, the solidifying material liquid is switched to a water-soluble liquid mixed with clay such as bentonite or a low-concentration solidifying material liquid, and the underground indicated by broken lines in (c) and (d). The concentration of the solidified material on the widened wall 3 side is reduced from the boundary between the continuous wall 1 and the widened wall 3.
【0028】交差部30への鋼製連壁部材5の挿入終了か
ら、それに接続される鋼製連壁部材4の挿入までの作業
を拡幅壁3の硬化が始まらない程度の時間内に完了させ
られる場合には、固化材液の吐出をベントナイト液等に
切り替えずに、地中連続壁1の構築時から固化材液の吐
出を継続しながら拡幅壁3を構築することもある。The work from the end of the insertion of the steel continuous wall member 5 into the intersection 30 to the insertion of the steel continuous wall member 4 connected thereto is completed within a time period in which hardening of the widening wall 3 does not start. In such a case, the widening wall 3 may be constructed while the discharge of the solidifying material liquid is continued from the time of constructing the underground continuous wall 1 without switching the discharge of the solidifying material liquid to the bentonite liquid or the like.
【0029】切削刃6から拡幅切削刃60への交換は無端
チェーン7の全長の内、地上に出ている部分の切削刃6
に対して行われる。交換後、無端チェーン7を循環させ
ながら、カッターポスト8を進行方向前方側へ横行させ
ることにより拡幅壁3の構築が開始される。The replacement of the cutting blades 6 with the widened cutting blades 60 is performed by changing the cutting blades 6 on the part of the endless chain 7 that extend above the ground.
Done for After the replacement, the construction of the widened wall 3 is started by moving the cutter post 8 forward in the traveling direction while circulating the endless chain 7.
【0030】無端チェーン7が循環する向きの先頭に位
置する拡幅切削刃60が地中の最深部に到達した時点で、
地上に出ている残りの切削刃6を拡幅切削刃60に交換
し、無端チェーン7を逆向きに循環させながら、カッタ
ーポスト8を進行方向後方側へ横行させることにより注
入液との攪拌・混合が十分に行われた拡幅壁3が構築さ
れる。When the widened cutting blade 60 located at the head in the direction in which the endless chain 7 circulates reaches the deepest part in the ground,
The remaining cutting blades 6 on the ground are replaced with widened cutting blades 60, and the endless chain 7 is circulated in the reverse direction, and the cutter post 8 is traversed backward in the traveling direction to stir and mix with the injection liquid. The widening wall 3 in which the above has been sufficiently performed is constructed.
【0031】最初に交換された拡幅切削刃60が地中の最
深部を通過し、地上に出てきたときには更にその向きに
無端チェーン7を循環させる必要がないことから、逆向
きに無端チェーン7を循環させ、カッターポスト8も逆
向きに横行させる。When the widened cutting blade 60 first exchanged passes through the deepest part of the ground and comes out on the ground, there is no need to further circulate the endless chain 7 in that direction. And the cutter post 8 is also traversed in the opposite direction.
【0032】最初に交換された拡幅切削刃60が地上に出
たことを目視によらずに確認する上では、図8に示すよ
うにカッターポスト8に、あるいはそれを支持するリー
ダー17に、拡幅切削刃60が接触、もしくは係止し、駆動
ローラ15の回転の向きを切り替えるリミットスイッチ18
が取り付けられる。カッターポスト8の上端部に駆動ロ
ーラ15の保護のためにカバー19が装着されている場合
で、交換後の拡幅切削刃60がカバー19に衝突する可能性
がある場合には衝突防止のためにも、リミットスイッチ
18による駆動ローラ15の逆回転が必要とされる。In order to visually confirm that the widened cutting blade 60 that has been replaced first has come out of the ground, it is necessary to widen the blade to the cutter post 8 as shown in FIG. The limit switch 18 that contacts or locks the cutting blade 60 and switches the rotation direction of the drive roller 15
Is attached. When the cover 19 is attached to the upper end of the cutter post 8 to protect the driving roller 15 and the widened cutting blade 60 after replacement may collide with the cover 19, Also limit switch
A reverse rotation of the drive roller 15 by 18 is required.
【0033】図2,図3に示すように拡幅切削刃60によ
る拡幅壁3の構築後、そのソイルセメントの硬化前に拡
幅壁3中に鋼製連壁部材4,5が挿入される。交差部30
以外の部分に挿入される鋼製連壁部材4はH形断面を
し、幅方向両側に、隣接する鋼製連壁部材4,5との接
続のための継手部4a,4bが形成される。As shown in FIGS. 2 and 3, after the widening wall 3 is constructed by the widening cutting blade 60, the steel continuous wall members 4, 5 are inserted into the widening wall 3 before the soil cement is hardened. Intersection 30
The steel connecting wall member 4 inserted into the other part has an H-shaped cross section, and joints 4a, 4b for connection with the adjacent steel connecting wall members 4, 5 are formed on both sides in the width direction. .
【0034】拡幅壁3における鋼製連壁部材4,5の挿
入に当たっては、幅方向両側に継手部4a,4bを有する鋼
製連壁部材4を先に挿入し、その継手部4bをガイドとし
て交差部30の鋼製連壁部材5を挿入することが好まし
い。In inserting the steel connecting wall members 4 and 5 into the widening wall 3, the steel connecting wall member 4 having the joints 4a and 4b on both sides in the width direction is inserted first, and the joint 4b is used as a guide. It is preferable to insert the steel continuous wall member 5 at the intersection 30.
【0035】交差部30の鋼製連壁部材5を後に挿入する
のは、図3に示す鋼製連壁部材5が幅方向にも成方向に
も非対称形であるために、単独では吊り込み時にバラン
スを取りにくく、鉛直性を確保しにくいためである。先
行して挿入されている鋼製連壁部材4の継手部4bをガイ
ドとし、それに継手部5aを嵌合させて鋼製連壁部材5を
挿入すれば、容易に挿入時の安定性と鉛直性を確保しな
がら挿入することが可能になる。The steel connecting wall member 5 at the intersection 30 is inserted later because the steel connecting wall member 5 shown in FIG. 3 is asymmetrical in both the width direction and the forming direction. This is because it is sometimes difficult to maintain balance and to secure verticality. If the joint portion 4b of the steel connecting wall member 4 inserted in advance is used as a guide and the joint portion 5a is fitted thereto and the steel connecting wall member 5 is inserted, the stability at the time of insertion and the vertical It becomes possible to insert while ensuring the performance.
【0036】交差部30に挿入される鋼製連壁部材5は拡
幅壁3中に挿入される鋼製連壁部材4側と、交差する地
中連続壁2中に挿入される鋼製連壁部材4側のそれぞれ
に継手部5a,5bが形成される。図面では2方向に継手部
5a,5bを持たせる関係から、鋼製連壁部材5の本体を箱
形断面にしているが、H形断面その他の形状に形成する
こともある。The steel connecting wall member 5 inserted into the intersection 30 is a steel connecting wall member 4 inserted into the widening wall 3 and a steel connecting wall inserted into the intersecting underground continuous wall 2. Joint portions 5a and 5b are formed on each of the members 4 side. In the drawing, the joint part in two directions
Although the main body of the steel continuous wall member 5 has a box-shaped cross section because of the provision of 5a and 5b, it may be formed into an H-shaped cross section or other shapes.
【0037】互いに接続される鋼製連壁部材4,5の継
手部4b,4a、4b,5a、5b,4aは嵌合や係合により接続さ
れることから、一方の継手部4b,5bが凹形状(雌)であ
る場合は他方の継手部4a,5aが凸形状(雄)となるよう
に組み合わせられるため、図示するようにある鋼製連壁
部材4,5の継手部4a,4b、5a,5bは両側共、凹形状、
もしくは凸形状である場合の他、一方が凹形状で、他方
が凸形状である場合がある。The joints 4b, 4a, 4b, 5a, 5b, 4a of the steel connecting wall members 4, 5 connected to each other are connected by fitting or engagement, so that one of the joints 4b, 5b is connected. In the case of a concave shape (female), the other joint portions 4a and 5a are combined so as to have a convex shape (male), so that the joint portions 4a and 4b of the steel continuous wall members 4 and 5, 5a, 5b are concave on both sides,
Alternatively, in addition to the case of a convex shape, there is a case where one is a concave shape and the other is a convex shape.
【0038】拡幅壁3内においては、図4に示すように
上記の通り、鋼製連壁部材5挿入時の安定性確保の面か
らは、先行して施工された地中連続壁1寄りに、交差部
の鋼製連壁部材5を挿入する上での基準となる鋼製連壁
部材4が挿入され、続いて交差部30に鋼製連壁部材5が
挿入される。その場合は図4に示す→→→の順
序で施工される。In the widened wall 3, as shown in FIG. 4, as described above, from the viewpoint of securing the stability when the steel continuous wall member 5 is inserted, it is closer to the underground continuous wall 1 that was previously constructed. The steel connecting wall member 4 serving as a reference for inserting the steel connecting wall member 5 at the intersection is inserted, and then the steel connecting wall member 5 is inserted into the intersection 30. In that case, construction is performed in the order of →→→ shown in FIG.
【0039】鋼製連壁部材5が例えば幅方向か成方向に
対称形をし、単独で挿入時の安定性を確保できる場合
は、各鋼製連壁部材4,5の挿入の順序は問われず、図
4において→→→の順序で施工する場合も、
→→→の順序で施工する場合もある。挿入時の安
定性とは関係なく、鋼製連壁部材4,5の位置決めをす
る上で、交差部30の鋼製連壁部材5を基準としたいため
に、その鋼製連壁部材5を最初に先行して挿入すること
もある。In the case where the steel connecting wall members 5 are symmetrical in the width direction or the forming direction, for example, and the stability at the time of insertion alone can be ensured, the order of insertion of the steel connecting wall members 4 and 5 does not matter. In the case of FIG. 4 where the construction is performed in the order of →→→
The construction may be performed in the order of →→→. Irrespective of the stability at the time of insertion, in order to position the steel continuous wall members 4 and 5 in order to refer to the steel continuous wall member 5 of the intersection 30, the steel continuous wall member 5 is used. It may be inserted earlier.
【0040】交差部30に挿入される鋼製連壁部材5の、
後から施工される地中連続壁2側の継手部5bは拡幅壁3
の境界に沿った位置に形成されることから、鋼製連壁部
材5の挿入時の位置決めの手掛かりとなるため、交差部
30に挿入される鋼製連壁部材5を拡幅壁3中に挿入する
際に、鋼製連壁部材5の位置決めをし易くする上では、
図4に示すように後から施工される地中連続壁2側の継
手部5bの反対側にも拡幅壁3の境界に沿う突起5cが形成
される。The steel continuous wall member 5 inserted into the intersection 30
The joint 5b on the underground continuous wall 2 side to be constructed later is the widened wall 3.
Is formed at a position along the boundary of the cross section, and serves as a clue for positioning when the steel continuous wall member 5 is inserted.
In order to facilitate positioning of the steel continuous wall member 5 when the steel continuous wall member 5 inserted into the 30 is inserted into the widening wall 3,
As shown in FIG. 4, a projection 5c is formed along the boundary of the widened wall 3 also on the opposite side of the joint 5b on the underground continuous wall 2 side to be constructed later.
【0041】拡幅壁3を含む地中連続壁1への鋼製連壁
部材4,5の挿入後、拡幅壁3構築用の拡幅切削刃60を
地中連続壁2構築用の切削刃6に交換し、構築済みの地
中連続壁1に交差する方向の地中連続壁2が構築され、
鋼製連壁部材4が挿入される。図4中、地中連続壁2上
の矢印は鋼製連壁部材4の挿入の順序を示す。After inserting the steel continuous wall members 4 and 5 into the underground continuous wall 1 including the widened wall 3, the widened cutting blade 60 for constructing the widened wall 3 is replaced with the cutting blade 6 for constructing the underground continuous wall 2. Exchange, the underground continuous wall 2 in the direction intersecting with the constructed underground continuous wall 1 is constructed,
The steel continuous wall member 4 is inserted. 4, the arrow on the underground continuous wall 2 indicates the order of insertion of the steel continuous wall member 4.
【0042】施工装置9の移動時には無端チェーン7を
装着したままカッターポスト8をリーダー17に沿って引
き上げながら、軸方向に切り離し、施工装置12から分離
したカッターポスト8をそれぞれ次の施工箇所に移動さ
せ、再度分割されたカッターポスト8を組み立てなが
ら、リーダー17に支持させることが行われる。When the construction device 9 is moved, the cutter post 8 is pulled up along the leader 17 while the endless chain 7 is mounted, is cut off in the axial direction, and the cutter post 8 separated from the construction device 12 is moved to the next construction site. Then, the cutter post 8 which has been divided again is supported by the leader 17 while assembling.
【0043】地中連続壁1,2がL形に交差して、また
は箱形に周回して地中構造物を構成する場合に、後から
施工される地中連続壁2の構築を開始し、先行する地中
連続壁1の交差部30まで到達した時点で、交差部30や拡
幅壁3におけるソイルセメントが硬化している事態を回
避する上では、拡幅壁3に交差する方向の地中連続壁2
はその全長の内の中途から、拡幅壁3側へ向かって構築
される。地中連続壁1,2を箱形に周回させる場合は全
体的には例えば図5に示すような手順で施工されること
になる。When the underground continuous walls 1 and 2 intersect in an L shape or wrap around in a box shape to form an underground structure, construction of the underground continuous wall 2 to be constructed later is started. In order to avoid the situation where the soil cement at the intersection 30 or the widening wall 3 is hardened at the time of reaching the intersection 30 of the preceding underground continuous wall 1, the underground in the direction intersecting the widening wall 3 is necessary. Continuous wall 2
Is constructed from the middle of the entire length toward the widening wall 3 side. When the underground continuous walls 1 and 2 are made to go around in a box shape, they are generally constructed in a procedure as shown in FIG. 5, for example.
【0044】図5に示す手順で施工すれば、交差部30に
おけるソイルセメントの硬化前に、後から施工される地
中連続壁2中への鋼製連壁部材4の挿入を完了させるこ
とができるため、交差部30における鋼製連壁部材5の地
中連続壁2側の継手部5b回りのソイルセメントを破砕し
ながら、それに接続される鋼製連壁部材4を落とし込む
必要がなく、交差部30の鋼製連壁部材5と地中連続壁2
の鋼製連壁部材4の接続を容易に行うことができる。If the construction is performed according to the procedure shown in FIG. 5, before the soil cement is hardened at the intersection 30, the insertion of the steel continuous wall member 4 into the underground continuous wall 2 to be constructed later can be completed. Therefore, it is not necessary to drop the steel continuous wall member 4 connected thereto while crushing the soil cement around the joint 5b on the underground continuous wall 2 side of the steel continuous wall member 5 at the intersection 30. Section 5 steel wall member 5 and underground continuous wall 2
Can be easily connected to the steel continuous wall member 4.
【0045】[0045]
【発明の効果】交差する2方向の内の1方向の地中連続
壁を他の方向の地中連続壁との交差部の手前まで構築し
た後、その地中連続壁に連続し、その壁厚より大きい壁
厚の拡幅壁を、他の方向の地中連続壁に交わる位置まで
構築するため、2方向に継手部を持つ鋼製連壁部材の交
差部への挿入が可能になると同時に、鋼製連壁部材をい
ずれの方向にも接続した状態とすることができる上、容
易に鋼製連壁部材を壁厚の中心部に配置することができ
る。The underground continuous wall in one of the two intersecting directions is constructed up to the intersection with the underground continuous wall in the other direction, and then connected to the underground continuous wall. In order to construct a widened wall with a wall thickness greater than the thickness to a position where it intersects the underground continuous wall in the other direction, it becomes possible to insert a steel continuous wall member having joints in two directions at the intersection, The steel continuous wall member can be connected in any direction, and the steel continuous wall member can be easily arranged at the center of the wall thickness.
【0046】請求項4では無端チェーンの一部の切削刃
を一旦、幅方向両端間距離の大きい拡幅切削刃に交換し
て行うため、カッターポストを地上に引き上げることな
く、カッターポストの一度の横行によって拡幅壁を構築
でき、施工効率が上がる。In the fourth aspect, since a part of the cutting blade of the endless chain is temporarily replaced with a widened cutting blade having a large distance between both ends in the width direction, the cutter post is not pulled up to the ground, and the cutter post is traversed only once. The widening wall can be constructed by this, and the construction efficiency increases.
【0047】請求項7では拡幅壁に交差する方向の地中
連続壁の構築と、その地中連続壁への鋼製連壁部材の挿
入をその全長の内の中途から、拡幅壁側へ向かって施工
するため、後から施工される地中連続壁の構築を開始
し、交差部まで到達した時点で、先行する地中連続壁の
交差部におけるソイルセメントが硬化している事態を回
避することができ、交差部に挿入されている鋼製連壁部
材とそれに接続される鋼製連壁部材との接続を容易に行
うことが可能になる。In the seventh aspect, the construction of the underground continuous wall in the direction intersecting with the widened wall and the insertion of the steel continuous wall member into the underground continuous wall are performed from the middle of the entire length toward the widened wall side. To start the construction of the underground diaphragm wall to be constructed later, and to avoid the situation where the soil cement at the intersection of the preceding underground diaphragm wall has hardened when reaching the intersection It is possible to easily connect the steel continuous wall member inserted into the intersection and the steel continuous wall member connected thereto.
【図1】(a) 〜(d) は地中連続壁から拡幅壁までの施工
要領を示した平面図である。1 (a) to 1 (d) are plan views showing construction procedures from an underground continuous wall to a widened wall.
【図2】拡幅壁の構築が完了した様子を示した平面図で
ある。FIG. 2 is a plan view showing a state where the construction of the widening wall is completed.
【図3】拡幅壁に鋼製連壁部材を挿入した様子を示した
平面図である。FIG. 3 is a plan view showing a state where a steel continuous wall member is inserted into a widening wall.
【図4】2方向の地中連続壁への鋼製連壁部材の挿入の
手順を示した平面図である。FIG. 4 is a plan view showing a procedure of inserting a steel continuous wall member into an underground continuous wall in two directions.
【図5】地中連続壁が箱形に周回する場合の施工手順を
示した平面図である。FIG. 5 is a plan view showing a construction procedure when the underground continuous wall goes around in a box shape.
【図6】施工装置と地中連続壁構築の様子を示した立面
図である。FIG. 6 is an elevation view showing a construction apparatus and a state of underground continuous wall construction.
【図7】カッターポストの下端部を示した立面図であ
る。FIG. 7 is an elevational view showing a lower end portion of the cutter post.
【図8】リミットスイッチの取付の様子を示した立面図
である。FIG. 8 is an elevational view showing how a limit switch is mounted.
【図9】従来の鋼製連壁部材の配置状態を示した平面図
である。FIG. 9 is a plan view showing an arrangement state of a conventional steel continuous wall member.
1,2……地中連続壁、3……拡幅壁、30……交差部、
4……鋼製連壁部材、4a,4b……継手部、5……鋼製連
壁部材、5a,5b……継手部、5c……突起、6……切削
刃、60……拡幅切削刃、7……無端チェーン、8……カ
ッターポスト、9……施工装置、10……油圧シリンダ、
11……架台、12……走行装置、13……供給路、14……吐
出口、15……駆動ローラ、16……アイドルローラ、17…
…リーダー、18……リミットスイッチ、19……カバー。1,2 ... Underground wall, 3 ... Walling wall, 30 ... Intersection,
4 ... steel connecting wall member, 4a, 4b ... joint, 5 ... steel connecting wall member, 5a, 5b ... joint, 5c ... projection, 6 ... cutting blade, 60 ... wide cutting Blade, 7 Endless chain, 8 Cutter post, 9 Construction equipment, 10 Hydraulic cylinder,
11 ... stand, 12 ... traveling device, 13 ... supply path, 14 ... discharge port, 15 ... drive roller, 16 ... idle roller, 17 ...
... leader, 18 ... limit switch, 19 ... cover.
Claims (7)
差部において、切削刃を有する無端チェーンをカッター
ポストの周囲で循環させながら、カッターポストを地中
に挿入したまま横行させると同時に、カッターポストの
下端部、もしくは地表面付近から注入液を吐出し、交差
する2方向の内の1方向の地中連続壁を他の方向の地中
連続壁との交差部の手前付近まで構築した後、その地中
連続壁に連続し、その壁厚より大きい壁厚の拡幅壁を、
他の方向の地中連続壁と交わる位置まで構築する地中連
続壁交差部の施工方法。An endless chain having a cutting blade is circulated around a cutter post at the intersection of two underground continuous walls intersecting with each other, while the cutter post is traversed while being inserted into the ground, Injected liquid is discharged from the lower end of the cutter post or near the ground surface, and an underground continuous wall in one of the two intersecting directions is built up to near the intersection with the underground continuous wall in the other direction. Later, a widened wall that is continuous with the underground continuous wall and has a wall thickness larger than the wall thickness is
A method of constructing an underground continuous wall intersection that is built up to a position where it intersects with another underground continuous wall.
求項1記載の地中連続壁交差部の施工方法。2. The method according to claim 1, wherein the underground continuous walls in two directions are orthogonal to each other.
差部に挿入され、2方向に継手部を有する鋼製連壁部材
を挿入できる程度の幅を持っている請求項1、もしくは
請求項2記載の地中連続壁交差部の施工方法。3. The widened wall is inserted at the intersection with the underground continuous wall in another direction, and has a width large enough to insert a steel continuous wall member having a joint in two directions. Or the method of constructing an underground continuous wall intersection according to claim 2.
続壁との交差部の手前付近まで構築したところで、無端
チェーンの一部の切削刃を一旦、幅方向両端間距離の大
きい拡幅切削刃に交換して拡幅壁を構築する請求項1乃
至請求項3のいずれかに記載の地中連続壁交差部の施工
方法。4. When the underground continuous wall in one direction is constructed up to near the intersection with the underground continuous wall in the other direction, a part of the cutting blades of the endless chain is temporarily set to a distance between both ends in the width direction. The construction method of an underground continuous wall intersection according to any one of claims 1 to 3, wherein the widened wall is constructed by replacing with a large widened cutting blade.
差部にその硬化前に2方向に継手部を有する鋼製連壁部
材を挿入する請求項1乃至請求項4のいずれかに記載の
地中連続壁交差部の施工方法。5. A steel connecting wall member having joints in two directions before the hardening thereof is inserted into an intersection of the widened wall and the underground continuous wall in another direction. Construction method of the underground continuous wall intersection described in Crab.
交差部寄りの反対側に鋼製連壁部材を挿入した後、それ
に接続するように交差部に2方向に継手部を有する鋼製
連壁部材を挿入する請求項5記載の地中連続壁交差部の
施工方法。6. A steel continuous wall member is inserted into the widened wall on the side opposite to the intersection with the underground continuous wall in the other direction, and then the joint is connected to the intersection in two directions so as to be connected thereto. The method for constructing an underground continuous wall intersection according to claim 5, wherein a steel continuous wall member having:
築と、その地中連続壁への鋼製連壁部材の挿入をその全
長の内の中途から、拡幅壁側へ向けて施工する請求項
5、もしくは請求項6記載の地中連続壁交差部の施工方
法。7. Construction of an underground continuous wall in a direction intersecting with the widening wall and insertion of a steel continuous wall member into the underground continuous wall from the middle of the entire length toward the widening wall side. The construction method of an underground continuous wall intersection according to claim 5 or claim 6.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006249807A (en) * | 2005-03-11 | 2006-09-21 | Nippon Steel Corp | Steel-made member of corner section of continuous underground wall, continuous underground wall using the same and connection method of steel-made continuous walls in different directions |
JP2006342593A (en) * | 2005-06-09 | 2006-12-21 | Tenox Corp | Formation method of corner section of continuous underground wall, corner steel made continuous wall member of the continuous underground wall and soil cement continuous underground wall having the corner section |
JP2019065457A (en) * | 2017-09-28 | 2019-04-25 | 清水建設株式会社 | Underground continuous wall structure |
-
2001
- 2001-03-19 JP JP2001078079A patent/JP2002275886A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006249807A (en) * | 2005-03-11 | 2006-09-21 | Nippon Steel Corp | Steel-made member of corner section of continuous underground wall, continuous underground wall using the same and connection method of steel-made continuous walls in different directions |
JP4542450B2 (en) * | 2005-03-11 | 2010-09-15 | 新日本製鐵株式会社 | The steel part of a corner part of an underground continuous wall, the underground continuous wall using the same, and the connection method of steel continuous walls from which directions differ. |
JP2006342593A (en) * | 2005-06-09 | 2006-12-21 | Tenox Corp | Formation method of corner section of continuous underground wall, corner steel made continuous wall member of the continuous underground wall and soil cement continuous underground wall having the corner section |
JP2019065457A (en) * | 2017-09-28 | 2019-04-25 | 清水建設株式会社 | Underground continuous wall structure |
JP7033424B2 (en) | 2017-09-28 | 2022-03-10 | 清水建設株式会社 | Underground continuous wall structure |
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