JPH033039B2 - - Google Patents

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、既設構造物や、シールド工事によつ
て築造されるセグメント構造物等地下構造物にあ
つて、その所要部に拡大部分を築造する為の拡幅
工法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to existing structures and underground structures such as segment structures constructed by shield construction, in which enlarged portions are constructed in required parts. Regarding the widening method for

〔従来の技術〕[Conventional technology]

近年、市街地における電力通信の洞道、上下水
道管路、地下鉄、道路のトンネル化等、地下構造
物は、その数にあつても、またその深度でも増大
していく傾向にある。 In recent years, underground structures such as power communication tunnels, water and sewage pipes, subways, and road tunnels in urban areas have been increasing in number and depth.

これら地下構築物の多くはシールド工事によつ
て築造されているが、この場合には何れも管路の
接合部や分岐部、安全帯、機器設置帯等にあつて
掘進径以上の拡大部分を局所に築造しなければな
らないことが多い。 Many of these underground structures are constructed using shield construction, but in this case, areas that are larger than the excavation diameter are locally enlarged at pipe joints, branch points, safety belts, equipment installation zones, etc. It is often necessary to construct

このような拡大部分の築造は、地上から中間立
坑を掘つて行なうのが一般的であるが、この方法
では深度の増大と共に施工が困難になるだけでな
く、工事費も巨額となつてしまい、特に過密度の
市街地では中間坑の用地確保や、それに伴なう振
動、騒音、周辺の地盤沈下問題等々、その対索に
苦慮しているのが現況である。 The construction of such an enlarged section is generally done by digging an intermediate shaft from the ground, but this method not only becomes difficult to construct as the depth increases, but also increases the construction cost. Particularly in overcrowded urban areas, it is currently difficult to secure land for intermediate shafts, and to deal with the accompanying problems of vibration, noise, and surrounding ground subsidence.

かかる事情に鑑み、これまで既に第１図、第２
図に示した如き地下構築物の拡幅工法が提案され
ている。 In view of these circumstances, we have already prepared Figures 1 and 2.
A method of widening underground structures as shown in the figure has been proposed.

第１図に示した工法は、同図イ〜ヘの手順で進
められる。 The construction method shown in Fig. 1 is carried out according to the steps A to F of the figure.

即ち、拡大予定地ａのセグメントには、取り外
し可能なものを使用し、先ず拡大シールド機の組
立部分を掘削する為、当該箇所の一次セグメント
を取り外し、特殊掘削機を使つて改良地盤ｂを、
ハに示した如く拡幅に掘削して拡幅掘削部ｃを形
成し、同部ｃに山留ジヤツキｄを同図ニに示した
如く配置した後、同図ホ，ヘに示した如く上記拡
大シールド機により拡大シールド掘進を行い掘進
完了後、同シールド機を解体して拡大部ｅを築造
する工法である。 That is, a removable segment is used for the planned expansion area a, and in order to excavate the assembly area of the expansion shield machine, the primary segment of the area is removed, and a special excavator is used to excavate the improved ground b.
Excavation is performed to widen the width as shown in C to form a widened excavated part c, and after arranging the retaining jack d in the same part c as shown in D of the same figure, the enlarged shield is formed as shown in E and F of the same figure. In this construction method, an enlarged shield excavation is carried out using a machine, and after the excavation is completed, the shield machine is dismantled and an enlarged section e is constructed.

第２図に示した工法は、セグメント切拡げ工法
であつて、先ず同図イに示した如く、一次覆工時
に刃口セグメントｆを含む特殊セグメントｇを組
込んでおき、次いで、同図ロに示した如く刃口セ
グメントｆに泥水環流装置を取付け、掘削機ｈを
定位置にセツトする。 The construction method shown in Figure 2 is a segment cutting and widening method, in which a special segment g including the cutting edge segment f is first incorporated during the primary lining as shown in Figure A, and then As shown in Fig. 3, a mud water circulation device is attached to the cutting edge segment f, and the excavator h is set in a fixed position.

次いで、同図ハに示した如く拡幅装置付カツタ
ーｉを刃口セグメントｆに貫入し、泥水掘削を行
いながらボツクスフレームｊを所定の位置まで圧
入していつて拡幅する。 Next, as shown in Figure C, a cutter i with a width widening device is inserted into the cutting edge segment f, and while excavating muddy water, a box frame j is press-fitted to a predetermined position to widen the width.

この拡幅は一リング毎に行ない、反対側も同様
に行なつて、最後にボツクスフレームｊの側板を
撤去し、二次覆工ｋにより同図ニに示したような
拡幅トンネルを築造する。 This widening is carried out for each ring, and the same is carried out on the opposite side.Finally, the side plate of the box frame j is removed, and a widened tunnel as shown in Fig. d is constructed using the secondary lining k.

しかしながら、上記工法によると次のような問
題点がある。 However, the above method has the following problems.

前者の工法によると、 拡大シールド機組立エーリアは、地盤改良に
頼り、手掘りによらねばならない。 According to the former construction method, the expansion shield machine assembly area relies on ground improvement and must be dug by hand.

大型シールド機の場合、上記エーリアはかな
り大きいものにする必要があり、又組立が非常
に困難となる。 In the case of a large shield machine, the area needs to be quite large, and assembly is very difficult.

拡大シールド掘進時の既設セグメントの撤去
が必要となる。 Existing segments will need to be removed when excavating the expansion shield.

拡大妻部の特殊セグメントが必要となる。 A special segment of the enlarged gable is required.

通常シールドと拡大シールドとの同時掘進が
可能であつても、セグメント搬送に問題が残
る。 Even if it is possible to simultaneously excavate the normal shield and the expanded shield, there remains a problem with segment transportation.

又、後者工法によると、 拡幅掘削機がおさまらない小口径一次掘削孔
では実施不可能である。 Furthermore, the latter method is not possible in small-diameter primary boreholes where the widening excavator cannot fit.

泥水圧作用に至るまでの補助工法が必要で隔
壁が困難である。 It is difficult to construct bulkheads because auxiliary construction methods are required to create mud water pressure.

特殊異形セグメントが必要。 Requires special irregular segment.

拡幅部延長が長い場合は時間がかかる。 If the extension of the widening section is long, it will take time.

拡幅部セグメントの止水性に難点がある。 There is a problem with the water-tightness of the widened segment.

そこで、上述問題点を解消したものとして、既
に本願人により次のような拡幅工法が提案されて
いる。 Therefore, the following widening method has already been proposed by the applicant as a solution to the above-mentioned problems.

この工法は第３図イ，ロに示したように、構造
物ｌの拡幅予定部l¹に、刃口ガードシエルｍの一
端をピン構造ｎの回転中心Ｏをもつて枢着してお
き、上記刃口ガードシエルｍをジヤツキ等にて図
中矢印Ｐで示した回転方向へ推進させて土中に押
し込み、該刃口ガードシエルｍを所要量押し込ん
だ後、これにガードシエルＱを継ぎ足し、再び推
進力を与えて押し込み、以下これを繰返して上記
刃口ガードシエルｍの回転範囲Ｒを拡幅掘削する
ようにしたのである。 In this construction method, as shown in Fig. 3 A and B, one end of the blade guard shell m is pivotally attached to the planned widening portion ^l1 of the structure l, with the rotation center O of the pin structure n. Using a jack or the like, propel the blade guard shell m in the direction of rotation shown by the arrow P in the figure and push it into the soil. After pushing the blade guard shell m by the required amount, add the guard shell Q to it. Propulsive force was applied again to push it in, and this process was then repeated to widen the rotation range R of the blade guard shell m.

この工法によると、前者の二工法に比べてシー
ルド工事によるセグメント構造物並びに既設構造
物を簡単な設備を用いて簡単に拡幅でき、かつそ
の拡幅する長さ、方向、断面寸法を任意に選べる
ことになり、効果的である。 According to this construction method, segment structures and existing structures created by shield construction can be easily widened using simple equipment compared to the former two construction methods, and the length, direction, and cross-sectional dimensions of the widening can be arbitrarily selected. and effective.

しかし、この工法では、第４図に示した如き、
一体構造の刃口ガードシエルｍを用いるのであ
り、該刃口ガードシエルｍの長さＳは、拡幅掘削
部のそれと同一に形成されており、これをジヤツ
キ等で一気に押し込むのであつて、その大きな刃
口断面で掘削、推進するので、押込み抵抗が大き
くなり、回転軸受に大きな荷重がかかり、又押込
み力の反力を受ける固定セグメントも大きな影響
を受ける。 However, with this construction method, as shown in Figure 4,
A blade guard shell m of integral structure is used, and the length S of the blade guard shell m is the same as that of the widening excavation section. Since excavation and propulsion are performed using the cross section of the cutting edge, the pushing resistance increases, a large load is applied to the rotating bearing, and the stationary segment, which receives the reaction force of the pushing force, is also greatly affected.

又、拡幅予定部には、第３図に示した刃口ガー
ドシエルｍと浮動セグメントＴとをピン構造ｎで
枢着してなる特殊セグメントｖを組立てるのであ
るが、該特殊セグメントｖはシールド機内で組立
てる為、普通のセグメントＶと同様に外形を円形
にする必要があり、刃口形状を外形に合わせると
受口側がセグメント内（坑内）に大きく突出し、
坑内仮設の通過断面を大きく損なうことになる。 In addition, a special segment v is assembled in the area to be widened, which is made by pivotally connecting the blade guard shell m and the floating segment T shown in Fig. 3 with a pin structure n. In order to assemble it, the outer shape needs to be circular like a normal segment V, and when the cutting edge shape is matched to the outer shape, the socket side will protrude greatly into the segment (underground).
This will greatly damage the passage section of the underground temporary structure.

又、刃口ガードシエルｍの押込み部分の断面が
大きい為に、土質の違いによる片押し状態が予想
され、押込み部分のカジリ、ガードシエルの変形
等を防止する高精度のストローク管理が必要とな
ると共に、部分的な傷害物による押込み不能状態
となつた場合、対処が困難である。 In addition, since the cross section of the pushed-in part of the guard shell m is large, one-sided pushing is expected due to differences in soil quality, and highly accurate stroke management is required to prevent galling of the pushed-in part and deformation of the guard shell. At the same time, it is difficult to deal with the situation in which pushing becomes impossible due to a partially damaged object.

更に、山留、止水の為に、各部材間の隙間は極
力小さくする必要があり、特殊セグメントｖは高
い製作精度が要求されるといつた問題点が考えら
れる。 Further, there may be problems such as the gap between each member needs to be made as small as possible in order to retain water and prevent water, and the special segment v requires high manufacturing precision.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

そこで本発明は、本願人に先に提案した上述拡
幅工法の考えを更に進めて、押込み刃口（刃口ガ
ードシエル）を小ブロツクに分割し、各ブロツク
は摺動可能な継手で連結するようにして、該各ブ
ロツク毎にジヤツキ等にて回転摺動させることで
土中に押込むと共に、押込み順番としては、拡幅
予定部の左右両側部にあつて、矢板の曲げ曲率の
小さいものから順番に押込んで隔壁部を構築し、
その後周方向の刃口に矢板を接続し、上記隔壁部
を矢板をガイドとして土中に押込み、外周側隔壁
部を構築するようにして行くことによつて、推
力、方向性、施工性が良くなると共に、小型にし
て安価な設備で押込み作業ができ、かつ比較的長
いスパンを簡単に拡幅できるようにするのが、そ
の目的である。 Therefore, the present invention further advances the idea of the above-mentioned widening method previously proposed to the applicant, and divides the push-in cutting edge (cutting edge guard shell) into small blocks, and each block is connected with a slidable joint. Then, each block is pushed into the soil by rotating and sliding it with a jack, etc., and the pushing order is from the smallest bending curvature of the sheet piles on both the left and right sides of the area to be widened. Build the bulkhead by pushing it into the
After that, a sheet pile is connected to the cutting edge in the circumferential direction, and the partition wall is pushed into the soil using the sheet pile as a guide to construct the outer partition wall, which improves thrust, directionality, and ease of construction. At the same time, the purpose is to make it possible to carry out the pushing operation using small and inexpensive equipment, and to make it possible to easily widen relatively long spans.

〔問題点を解決するための手段〕[Means for solving problems]

即ち、本発明は既設構造物並びにセグメント構
造物の拡幅工法において、上記構造物の拡幅予定
部に、曲率半径が段階的に異なる複数個の刃口を
順番に周方向に組込むと共に、同一曲率半径の複
数個の刃口を軸方向に組込んで正面略〓形状のセ
グメントを組立てておき、先ず上記セグメントに
おける左右両側部の刃口に曲り矢板を接続し、こ
れに他の矢板を順次接続し、ジヤツキ等にて回転
方向へ推進させて土中に所要量押込むと共に、当
該矢板は曲率半径が小さいものから順番に上記刃
口に接続して土中に押込み、次いで前に押込んだ
矢板をガイドとして順次土中に押込むことによつ
て拡幅部の左右両側隔壁部を構築し、その後軸方
向の刃口に矢板を接続し、これに他の矢板を順次
接続して、かつ上記隔壁部の矢板をガイドとして
土中に押込み、以下これを繰返して外周側隔壁部
を構築し、該外周側隔壁部と上記隔壁部に囲成さ
れた部分を拡幅掘削するようにして、前述の問題
点を解決したのである。 That is, the present invention provides a method for widening existing structures and segment structures, in which a plurality of cutting edges with stepwise different radii of curvature are sequentially installed in the circumferential direction in a portion of the structure to be widened, and the same radius of curvature is A plurality of blade openings are assembled in the axial direction to assemble a segment having an approximately square shape when viewed from the front. First, curved sheet piles are connected to the blade openings on both the left and right sides of the segment, and other sheet piles are sequentially connected to these. The sheet piles are propelled in the rotating direction with a jack, etc. and pushed into the soil by the required amount, and the sheet piles are connected to the above-mentioned cutting edge in order from the one with the smallest radius of curvature and pushed into the soil, and then the sheet piles pushed in before are pushed into the soil. The bulkheads on both the left and right sides of the widening section are built by sequentially pushing them into the soil as a guide, and then a sheet pile is connected to the cutting edge in the axial direction, and other sheet piles are sequentially connected to this, and the above bulkhead is constructed. The above-mentioned problem is solved by pushing the sheet pile into the soil as a guide, and then repeating this process to construct the outer partition wall, and widen and excavate the area surrounded by the outer partition wall and the partition wall. This solved the problem.

〔実施例〕〔Example〕

以下本発明の実施例を図面に基づいて詳述す
る。 Embodiments of the present invention will be described in detail below based on the drawings.

第５図〜第７図は、シールド工事によつて築造
されるセグメント構造物１での拡幅の場合を示し
たもので、当該構造物１における拡幅予定部２に
おける周壁１ａの左右両側部に、曲率半径が異な
る複数個の刃口３′，３″，３…３ⁿを、その半
径の小さいものから順番に半径方向へ組合わせ、
その中心部における最小半径の刃口３′はピン構
造の回転中心Ｏを持つようにするか、当該刃口
３′だけは外側、つまり土中に押出して軸４止め
させておき、更に上記周壁１ａの軸方向にあつ
て、上記左右両側部の刃口３′…３ⁿ，３′…３ⁿの
間には、同一曲率半径の複数個の刃口５′，５″，
５…５ⁿを相互に軸方向へ組合わせて、かつそ
の左右両側端部の刃口５′，５ⁿは上記左右両側部
の刃口における最大曲率半径の刃口３ⁿ，３ⁿと
夫々摺動自在に組合わせておく。 FIGS. 5 to 7 show the case of widening a segment structure 1 constructed by shield construction, in which on both left and right sides of the surrounding wall 1a in the planned widening section 2 of the structure 1, A plurality of cutting edges 3', 3'', 3...3 ⁿ having different radii of curvature are combined in the radial direction in order from the one with the smallest radius,
Either the cutting edge 3' with the smallest radius in the center has the rotation center O of the pin structure, or the cutting edge 3' alone is pushed out to the outside, that is, into the soil, and fixed to the shaft 4, and then the surrounding wall In the axial direction of 1a, between the blade holes 3'... ³ⁿ , 3'... ³ⁿ on both the left and right sides, there are a plurality of blade holes 5', 5'',
5...5 ⁿ are combined in the axial direction, and the blade openings 5' and 5 ⁿ at the left and right ends are respectively the blade openings 3 ⁿ and 3 ⁿ of the maximum radius of curvature of the blade openings at the left and right sides. Combine them so that they can slide freely.

つまり、拡幅予定部２の左右両側部には、曲率
半径の異なる複数個の刃口３′…３ⁿを小さい半径
のものから順番に外側へ組合わせた刃口群３ａ，
３ｂを設け、該両刃口群３ａ，３ｂ間の最大曲率
半径の刃口３ⁿ，３ⁿに組合わせて周方向刃口群５
ａを設けておく。 In other words, on both left and right sides of the planned widening section 2, there are a group of blades 3a, which is a combination of a plurality of blades 3'... ³ⁿ with different radii of curvature, arranged outward in order from the one with the smallest radius.
3b, and in combination with the cutting edges 3 n and 3 ⁿ having the maximum radius of curvature between the double cutting edge groups 3 a and 3 ^b , a circumferential cutting edge group 5 is provided.
Set up a.

そして、先ず、上記両刃口群３ａ，３ｂにおけ
る最小曲率半径の刃口３′に、これと同一曲率半
径を有する曲り矢板６′を第８図イに示した如く
接続し、該矢板６′に、ジヤツキ等にて構造物１
の図示しないセグメント等に反力をとつて回転方
向の推進力を与えることにより該刃口３′を摺動
回転させ、土中に押込み、当該刃口３′を所要量
押込んだ後、上記矢板６′にこれと同一曲率半径
を有する他の矢板６″を第８図ロに示した如く接
続し、再び推進力を与えて刃口３′、矢板６′を押
込み、以下これを繰返して刃口３′の押込みを終
了する。 First, a curved sheet pile 6' having the same radius of curvature is connected to the cutting edge 3' having the minimum radius of curvature in the double edge group 3a, 3b as shown in FIG. , Structure 1 in Jyatsuki et al.
The cutting edge 3' is slid and rotated by applying a reaction force to a segment, etc. (not shown) in the rotating direction, and is pushed into the soil. After pushing the cutting edge 3' by the required amount, the above Connect another sheet pile 6'' having the same radius of curvature to the sheet pile 6' as shown in FIG. Finish pushing in the cutting edge 3'.

次いで、中心から二番目の刃口３″に矢板６′を
接続し、回転方向の推進力を与えることにより該
刃口３″を土中に押込んだ後、この矢板６′に他の
矢板６″を接続して再度推進力を与えて押込み、
以下、同様にして第８図ハに示した如く繰返すこ
とにより二番目の刃口３″の押込みを終える。 Next, a sheet pile 6' is connected to the second cutting edge 3'' from the center, and after pushing the cutting edge 3'' into the soil by applying a driving force in the rotational direction, another sheet pile is attached to this sheet pile 6'. Connect 6″ and push it in again by applying driving force.
Thereafter, the process is repeated in the same manner as shown in FIG. 8C to finish pushing in the second blade opening 3''.

このようにして半径の小さいものから順次矢板
６′，６″…を接続しながら刃口３′，３″，３…
３ⁿを土中に押込むのであり、この時、前に押込
んだ内側の矢板６′，６″…に、その外側の矢板
６′，６″…を噛み合わせて摺動回転をガイドして
やるのであり、第８図イ，ロ，ハ，ニ，ホに示し
た如く、夫々に矢板６′，６″…６ⁿて曲率半径の
小さい刃口３′，３″…３ⁿから順に受口部１ｂま
で摺動させながら押込み、構造物１にボルト止め
等にて固定することで、拡幅予定部２の左右両側
部に第６図イ，ロ，ハ、第７図イ，ロ，ハ、第８
図ホに示したような半径Ｒの隔壁部７，７を構築
する。 In this way, while connecting the sheet piles 6', 6''... sequentially from the one with the smallest radius, the blade openings 3', 3'', 3...
3 ⁿ is pushed into the soil, and at this time, the inner sheet piles 6', 6''... that were pushed in earlier are engaged with the outer sheet piles 6', 6''... to guide the sliding rotation. As shown in ^{FIG .} By sliding the part 1b to the part 1b and fixing it to the structure 1 with bolts, etc., the parts shown in Fig. 6 A, B, C, Fig. 7 A, B, C, etc. are attached to the left and right sides of the planned widening part 2. 8th
Partition walls 7, 7 having a radius R as shown in Figure E are constructed.

その後、前記外周刃口群５ａの各刃口５′，
５″…５ⁿには、上記両刃口群３ａ，３ｂにおける
最大曲率半径の刃口３ⁿに接続された矢板６′，
６″…と同一曲率半径を有する曲り矢板８，８″…
を順次接続してジヤツキ等により回転方向に推進
力を与えることで回転摺動させて土中に押込み、
受口部１ｂまで押込んでボルト等にて固定し、外
周側隔壁部８を構築する。 After that, each cutting edge 5' of the outer cutting edge group 5a,
5''... ⁵ⁿ includes sheet piles 6 ^' ,
Curved sheet piles 8,8″... having the same radius of curvature as 6″...
are connected one after another and a propulsion force is applied in the direction of rotation using jacks, etc. to rotate and slide and push it into the soil.
Push it in to the socket 1b and fix with bolts or the like to construct the outer partition wall 8.

又、複数個の刃口５′，５″…５ⁿは、各ブロツ
ク毎に押込むと共に、それら押込み順位は、上記
隔壁部７，７側からとする。 Further, the plurality of cutting edges 5', 5'^' , .

即ち、上記隔壁部７，７と隣接する順で第７図
イ，ロに示した如く、ブロツク毎内隔壁部８ａ，
８ｂ，８ｃ…を順番に構築するのであり、この
際、上記隔壁部８ａの刃口５′及びこれに接続す
る矢板８′，８″…は、上記隔壁部７，７における
外周部の刃口３ⁿおよび、これに連続する各矢板
６′，６″…における噛合部３ｃを、回転摺動のガ
イドとして順次押込むのであり、又隔壁部８ｂの
刃口５″及び矢板８′，８″…は前に構築された隔
壁部８ａにおける矢板８′，８″…の噛合部をガイ
ドとして押込むのであり、以下これと同様にして
隔壁部８ｃ…は構築される。 In other words, as shown in FIG.
8b, 8c... are constructed in order, and at this time, the cutting edge 5' of the partition wall part 8a and the sheet piles 8', 8''... connected thereto are the cutting edges of the outer periphery of the partition wall parts 7, 7. 3 ⁿ and the engaging portions 3c of the sheet piles 6', 6''... which are continuous thereto are sequentially pushed in as guides for rotational sliding, and the cutting edge 5'' of the partition wall portion 8b and the sheet piles 8', 8'' ... are pushed in using the engaging portions of the sheet piles 8', 8''... in the previously constructed partition wall portion 8a as a guide, and the partition wall portions 8c... are constructed in the same manner.

ここで、上記各ブロツク毎に隔壁部８ａ，８ｂ
…で構築される外周側隔壁部８の半径は上述両隔
壁部７，７のそれと同一に設定されるのである。 Here, partition wall portions 8a, 8b are provided for each of the above-mentioned blocks.
The radius of the outer circumferential partition wall 8 constructed by... is set to be the same as that of the above-mentioned partition walls 7, 7.

従つて、拡幅予定部には、連続して構築される
上記両隔壁部７，７と外周側隔壁部８によつて第
７図ハに示した如き半径Ｒの偏心した拡大部９が
掘削可能となる。 Therefore, in the area to be widened, an eccentric enlarged area 9 with a radius R as shown in FIG. becomes.

次に本発明工法をシールド工事によるセグメン
ト構造物を示した一具体例に基づいて詳述する。 Next, the construction method of the present invention will be explained in detail based on a specific example showing a segment structure by shield construction.

第９図に示したように、セグメント構造物１
は、通常のセグメント１０により組立てられる
が、その拡幅予定部２には、当該セグメント１０
にかえてセグメント型式が異なる特殊セグメント
１１を組込んでおく。 As shown in FIG. 9, segment structure 1
is assembled using normal segments 10, but the segment 10 is
Instead, a special segment 11 having a different segment type is incorporated.

この特殊セグメント１１は、受口部１ｂと、そ
の蓋板１ｃを有する浮動セグメント１１ａと、そ
の一端側にあつて、左右両側部に順番に組合わせ
て配置した上記刃口群３ａ，３ｂとからなり、上
記浮動セグメント１１ａと最小曲率半径の刃口
３′の一端が上述の如くピン構造の回転中心Ｏ、
又は軸４止めによつてシールド構造物１に枢着さ
れている。 This special segment 11 consists of a floating segment 11a having a socket part 1b, a cover plate 1c thereof, and the above-mentioned blade groups 3a and 3b arranged in order on both left and right sides at one end side of the floating segment 11a. Thus, the floating segment 11a and one end of the cutting edge 3' having the minimum radius of curvature are at the rotation center O of the pin structure as described above.
Alternatively, it is pivotally connected to the shield structure 1 by a shaft 4 stop.

この特殊セグメント１１は、通常の場合、つま
りシールド構造物１をシールド工事によつて築造
する場合は、ボルト等にて普通のセグメント１０
に固定しておき、必要に応じて取り外しできるよ
うにしておく。 In the normal case, that is, when the shield structure 1 is constructed by shield construction, this special segment 11 is attached to the ordinary segment 10 using bolts or the like.
Keep it fixed so that it can be removed if necessary.

又、施工状況に応じて上記浮動セグメント１１
ａ及び刃口３′，３″…３ⁿは、その大きさ、数を
予め設定しておく。 In addition, depending on the construction situation, the above floating segment 11
The size and number of the blade a and the blade openings 3', 3'', . . . 3 ⁿ are set in advance.

又、上記特殊セグメント１１の取付けに際して
は、普通のセグメント１０と浮動セグメント１１
ａとの間に、呼び込み用のセグメント１２を介在
させておく。 Also, when installing the special segment 11, the ordinary segment 10 and the floating segment 11
A segment 12 for attracting is interposed between the terminal and the terminal a.

尚、上記特殊セグメント１１の組立ては一次覆
工時に行なう。 Incidentally, the special segment 11 is assembled during the primary lining.

そこで拡幅掘削に際しては、シールド構造物１
内の所定位置に刃口３′…３ⁿ用押込み機１３を第
１１図に示したようにセツトし、反力ジヤツキ１
４…によつて浮動セグメント１１ａをサポータ１
５にて支持することにより拡幅掘削準備を完了す
る。 Therefore, when widening excavation, shield structure 1
As shown in Fig. 11, set the pusher 13 for the blade openings 3'... ³ⁿ at a predetermined position inside the machine, and press the reaction force jack 1.
4. The floating segment 11a is connected to the supporter 1 by...
5 to complete the preparation for widening excavation.

次に、上記押込機１３の主ジヤツキ１６を各刃
口３′，３″…３ⁿ，５′…５ⁿに接続した矢板６′，
６″…６ⁿ，８′…に連枢して、これに推進力を与
え、図示の如く刃口３′，３″…３ⁿ，５′…５ｎ及
び矢板６′，６″…６ⁿ，８′…を外側へ押出して土
中に押込む。 Next, a sheet pile 6', which connects the main jack 16 of the pushing machine 13 to each cutting edge 3', 3''...3 ⁿ , 5'...5 ⁿ ,
6''...6 ⁿ , 8'... to give propulsion to these, and as shown in the figure, the blade openings 3', 3''...3 ⁿ , 5'...5n and sheet piles 6', 6''...6 ⁿ , 8'... are pushed outward and pushed into the soil.

上記刃口３′，３″…３ⁿ，５′…５ⁿ及び矢板
６′，６″…６ⁿ，８′…の押込みは、排土を行なう
ことなく単に土中に圧入するようにしてもよく、
また送排泥設備を用い、ウオータージエツトによ
る掘削、排土を行ないながら押込むようにしても
よく、それは土質状況に応じて任意に選定すれば
よい。 The above-mentioned blade openings 3', 3''...3 ⁿ , 5'...5 ⁿ and sheet piles 6', 6''...6 ⁿ , 8'... are pressed into the soil without removing the soil. Good too,
Alternatively, mud feeding and drainage equipment may be used to push the soil while excavating and discharging the soil using a water jet, and this may be selected arbitrarily depending on the soil condition.

従つて、拡幅予定部２における左右両側の地盤
は、曲率半径の異なる複数個の刃口３′，３″…３
^ｎの幅を加算した長さを半径として、かつ所定幅
の円弧状に夫々拡幅掘削されると共に、その間に
あつては外周の刃口５′，５″…５ⁿの回転摺動を
半径として所定幅の円弧状に拡幅掘削される。 Therefore, the ground on both left and right sides of the planned widening section 2 has a plurality of cutting edges 3', 3''...3 with different radii of curvature.
The radius is the sum of the widths of ⁿ , and the width is expanded in an arc shape with a predetermined width, and during that time, the rotational sliding of the cutting edges 5', 5''... ⁵ⁿ on the outer periphery is the radius. Excavation is carried out in an arcuate manner with a predetermined width.

上記各刃口３′…３ⁿ，５′…５ⁿの押込みによつ
て、上記隔壁部７，７，８を構築した後、それら
により防護された内側の土砂は、浮動セグメント
１１ａ等を取り外した後、取り除き、更に二次覆
工１７を行なうことで第１２図に示す如くシール
ド構造物１の一側に拡幅部分１８が築造される。 After constructing the partition walls 7, 7, 8 by pushing in the respective blade openings 3'... ³ⁿ , 5'... ⁵ⁿ , the inner earth and sand protected by them is removed by removing the floating segments 11a, etc. After that, it is removed and a secondary lining 17 is applied, thereby constructing a widened portion 18 on one side of the shield structure 1 as shown in FIG.

ここで、分割された刃口３′…３ⁿ，５′…５ⁿと
各矢板６′…６ⁿ，８′…８ⁿは第９図、第１０図、
第１３図ないし第１６図に示した如きボツクス構
造のものを用いることができ、このようにすれば
該刃口３′…３ⁿ，５′…５ⁿの断面形状に地盤は掘
削され、従つて、この刃口３′…３ⁿ，５′…５ⁿの
押込み完了後にあつて、その内部の土砂は、ジエ
ツト水もしくは機械力によつて排土する。 Here, the divided cutting edges 3'...3 ⁿ , 5'...5 ⁿ and each sheet pile 6'...6 ⁿ , 8'...8 ⁿ are shown in Fig. 9, Fig. 10,
A box structure as shown in FIGS. 13 to 16 can be used. In this way, the ground is excavated in the cross-sectional shape of the cutting holes 3'...3 ⁿ , 5'...5 ⁿ , and After the cutting edges 3'... ³ⁿ , 5'... ⁵ⁿ have been pushed in, the soil inside them is removed by jet water or mechanical force.

又、上記各刃口３′…３ⁿ，５′…５ⁿと、各矢板
６′，６″…６ⁿ，８′…８ⁿは両側部に噛合部１９，
２０，２１，２２が夫々設けてあり、相互に摺動
可能なるよう噛み合せてある。 In addition, each of the blade openings 3'...3 ⁿ , 5'...5 ⁿ and each sheet pile 6', 6''...6 ⁿ , 8'...8 ⁿ have engaging portions 19,
20, 21, and 22 are provided, respectively, and are meshed so as to be able to slide with each other.

又各刃口３′…３ⁿ，５′…５ⁿにはボルト２３に
て矢板ジヨイント部２４が内側に突出した状態で
固定してあり、該矢板ジヨイント部２４に上記矢
板６′…６ⁿ，８′，８ⁿはボルト（図示せず）によ
つて連結される。 In addition, a sheet pile joint 24 is fixed to each cutting edge 3'...3 ⁿ , 5'...5 ⁿ with bolts 23 in a state that projects inwardly, and the sheet pile 6'...6 ⁿ is fixed to the sheet pile joint 24 with a bolt 23. , 8', and ⁸ⁿ are connected by bolts (not shown).

更に各刃口３′…３ⁿ，５′…５ⁿの内部には水ジ
エツト配管２５と排泥管２６が固定してあり、上
記矢板６′…６ⁿ，８′…８ⁿの内部を通して水ジエ
ツトホース２７と排泥管２８が夫々接続されるこ
とにより、断面内の掘削、排土を行なうようにし
てある。 Furthermore, a water jet pipe 25 and a mud removal pipe 26 are fixed inside each cutting edge 3'... ³ⁿ , 5'... ⁵ⁿ , and are passed through the inside of the sheet piles 6'... ⁶ⁿ , 8'... ⁸ⁿ . The water jet hose 27 and mud removal pipe 28 are connected to each other so that excavation and soil removal within the cross section can be carried out.

ここで、上記排泥管２６には回転蓋２６ａが内
装させてある。 Here, the mud removal pipe 26 is equipped with a rotary lid 26a.

而して各刃口３′，３″…３ⁿ及び５′，５″…５ⁿ
相互は噛合によつて回転摺動されると共に、各矢
板６′…６ⁿと刃口３′…３ⁿ及び矢板８′…８ⁿと刃
口５′，５ⁿも噛合によつて回転摺動され、これに
よつてカジリ等を生じることなく推進力により円
滑な押込み動作が行われる。 Therefore, each cutting edge 3', 3''...3 ⁿ and 5', 5''...5 ⁿ
They are rotated and slid by meshing with each other, and each sheet pile 6'... ⁶ⁿ and the cutting edge 3'... ³ⁿ and the sheet pile 8'... ⁸ⁿ and the cutting edge 5', ⁵ⁿ are also rotated and slid by meshing with each other. As a result, a smooth pushing operation is performed by the driving force without causing galling or the like.

又、各矢板６′…６ⁿ，８′…８ⁿは内部にクラウ
ト材等を注入したり、PC鋼線によりテンシヨン
をかけるようにすることも可能である。 Further, each sheet pile 6'... ⁶ⁿ , 8'... ⁸ⁿ may be injected with a kraut material or the like, or may be tensioned with a PC steel wire.

第１７図ないし第２１図は本発明工法による拡
幅施工応用例を夫々示したもので、第１７図はセ
グメント構造物１としてのトンネルの左右両側に
拡幅部分１８を築造した地中ケーブル接続箇所の
拡幅例、第１８図は垂直に構築した既設構造物１
ｄの底部一側に拡幅部分１８を築造した下水通人
孔の拡幅例、第１９図はセグメント構造物１の一
側に拡幅部分を築造した安全帯、機器設置帯の拡
幅例、第２０図はセグメント構造物１としてのパ
イロツトトンネルの左右両側に拡幅部分を築造し
た複線トンネル例、第２１図はセグメント構造物
１としての本トンネルに大径の偏心拡幅部分１８
を築造した地下鉄道駅部の拡幅例である。 Figures 17 to 21 show examples of widening construction applications using the construction method of the present invention, and Figure 17 shows an underground cable connection point where widening parts 18 are constructed on both left and right sides of the tunnel as the segment structure 1. An example of widening, Figure 18 is an existing structure 1 built vertically.
Fig. 19 shows an example of widening a sewage passage hole with a widened part 18 built on one side of the bottom of d, and Fig. 20 shows an example of widening a safety belt and equipment installation zone with a widened part 18 built on one side of the segment structure 1. 21 is an example of a double-track tunnel in which widening sections are constructed on both left and right sides of a pilot tunnel as segment structure 1, and FIG.
This is an example of the widening of the subway station section that was constructed.

〔発明の効果〕〔Effect of the invention〕

本発明に係る地下構造物拡幅工法は以上説明し
たようにして拡幅部分を築造するようにしたので
あるから、地上の諸条件による制約を受けること
なく拡幅築造できると共に、刃口３′…３ⁿ，５′
…５″の周方向及び軸方向の組合わせ数や、その
組合わせ向きを適当に設定することによつて拡幅
する長さや、断面寸法を任意に選定することがで
き、又繰返しの拡幅工事により任意の大きな空間
をも構築できるだけでなく、土質、地下水圧に応
じた掘削方法を選ぶことができるので、あらゆる
地層での拡幅施工が可能であることはもとより、
特に本工法によると、刃口３′…３ⁿ，５′…５ⁿ及
び矢板６′…６ⁿ，８′…８ⁿを各ブロツク毎に押込
むので、土中に対する押込み断面が小さくなり、
推力、方向性、施工性が非常に良くなるばかりか
押込み力が小さくなることにより設備が小型、安
価になり、又一次覆工中の坑内通過断面欠損が極
小となるので、当該一次覆工の施工が容易とな
り、更に分割刃口３′…３ⁿ，５′…５ⁿは多ヒンジ
構造で組立てられるので、一体構造の刃口ガード
シエルのような構造物相互のカジリ等に対して多
少の変形余地を持たせ得るので、製作精度は一体
構造に比べて余裕がとれ、更に又、各ブロツク毎
の工法によつて押込み断面が小さくなるので、地
下障害物の対処が容易になると共に、予め隔壁部
７，７を構築した後、その両隔壁部７，７間に外
周側隔壁部８を構築するのであるから、上記隔壁
部７を適当スパン毎に適当数構築した後、その間
に外周側隔壁部８…を構築することによつて、比
較的長いスパンを容易に拡幅できる等の利点もあ
る。 Since the method for widening an underground structure according to the present invention constructs the widening portion as explained above, the widening can be constructed without being constrained by various conditions on the ^ground . ,5'
...By appropriately setting the number of circumferential and axial combinations of 5" and the combination direction, the length to be widened and the cross-sectional dimensions can be arbitrarily selected, and by repeating widening work. Not only can you construct any large space, but you can also choose the excavation method according to the soil quality and groundwater pressure, so it is not only possible to widen the area in any stratum.
In particular, according to this method, the cutting edges 3'... ³ⁿ , 5'... ⁵ⁿ and the sheet piles 6'... ⁶ⁿ , 8'... ⁸ⁿ are pushed into each block, so the cross section of the pushing into the soil becomes smaller.
Not only will the thrust, directionality, and workability be extremely improved, but the pushing force will be reduced, making equipment smaller and cheaper.Furthermore, the loss of the section passing through the tunnel during the primary lining will be minimized, so the primary lining will be improved. The construction is easier, and since the divided blade openings 3'... ³ⁿ , 5'... ⁵ⁿ are assembled with a multi-hinged structure, there is some resistance to mutual galling between structures such as the integrated blade guard shell. Since there is room for deformation, manufacturing accuracy can be increased compared to a monolithic structure.Furthermore, since the construction method for each block makes the pushing cross section smaller, it is easier to deal with underground obstacles, and it is possible to After constructing the partition wall portions 7, 7, the outer peripheral side partition wall portion 8 is constructed between the two partition wall portions 7, 7. Therefore, after constructing an appropriate number of the above-mentioned partition wall portions 7 for each appropriate span, the outer peripheral side By constructing the partition wall portions 8, there are also advantages such as being able to easily widen a relatively long span.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図イ〜ヘ、第２図イ〜ニは従来の拡幅施工
工法の具体例を夫々示した各工程断面図、第３図
イ，ロは拡幅施工工法の先行技術による具体例を
夫々示した特殊セグメント組立の平面図と、刃口
ガードシエル及びガードシエルの押込み状況の横
断面図、第４図イ，ロは拡幅施工工法の先行技術
における刃口ガードシエルを夫々示した各斜視
図、第５図イ，ロ，ハ，ニは本発明に係る地下構
造物拡幅工法の特殊セグメント組立を夫々示した
もので、イはその平面図、ロはその正面図、ハ，
ニはロにおけるハ−ハ線、ニ−ニ線各矢視横断面
図、第６図イ，ロ，ハは同工法における隔壁部施
工状態を夫々示したものでイはその平面図、ロは
その正面図、ハはロにおけるハ−ハ線矢視横断面
図、第７図イ〜ハは同工法における外周側隔壁部
の施工状態を夫々示したもので、イはその平面
図、ロはその正面図、ハはロにおけるハ−ハ線矢
視横断面図、第８図イ〜ホは同工法における隔壁
部施工状態を施工工程順に示した各説明図、第９
図は同工法のセグメント組立状態の横断面図、第
１０図は同工法の隔壁部刃口組込状態を示した正
面図、第１１図は同工法における刃口及び矢板押
込み機を例示した側面図、第１２図は同工法にお
けるセグメント構造物拡幅施工例を示した横断面
図、第１３図、第１４図は同工法に用いられる刃
口を夫々示した縦断側面図と横断面図、第１５
図、第１６図は同工法に用いられる矢板を夫々示
した一部断面の側面図と横断面図、第１７図、第
１８図、第１９図、第２０図、第２１図は同工法
における構造物拡幅施工応用例を夫々示した各横
断面図である。 １……セグメント構造物、２……拡幅予定部、
３′…３ⁿ，５′…５ⁿ……刃口、６′…６ⁿ，８′…
８ⁿ……曲り矢板、７，７……左右両側の隔壁部、
８……外周側隔壁部、１１……セグメント。 Figure 1 A to F and Figure 2 A to D are cross-sectional views of each process showing specific examples of the conventional widening construction method, and Figures 3 A and B show specific examples of the prior art widening construction method, respectively. 4A and 4B are perspective views showing the blade guard shell in the prior art of the widening construction method, respectively; Figure 5 A, B, C, and D show the special segment assembly of the underground structure widening method according to the present invention, where A is a plan view, B is a front view, C,
D is a cross-sectional view taken along the lines A-HA and N-II in B, and FIG. 7A is a front view of the front view, C is a cross-sectional view taken along the line A to B in B, and FIGS. Its front view, C is a cross-sectional view taken along the line H-HA in B, FIGS.
The figure is a cross-sectional view of the segment assembly state of the same method, Figure 10 is a front view showing the state where the cutting edge is installed in the bulkhead part of the same method, and Figure 11 is a side view illustrating the cutting edge and sheet pile pushing machine in the same method. 12 are cross-sectional views showing an example of segment structure widening construction using the same construction method. 15
Figures 16 and 16 are partial cross-sectional side and cross-sectional views of the sheet piles used in the same construction method, and Figures 17, 18, 19, 20, and 21 show the sheet piles used in the same construction method. FIG. 3 is a cross-sectional view showing an example of a structure widening construction application. 1... Segment structure, 2... Planned widening section,
3'...3 ⁿ , 5'...5 ⁿ ...blade mouth, 6'...6 ⁿ , 8'...
8 ⁿ ...Curved sheet pile, 7,7...Partition walls on both left and right sides,
8...Outer peripheral side partition wall portion, 11...Segment.

Claims (1)

【特許請求の範囲】 １ 既設構造物並びにセグメント構造物の拡幅工
法において、上記構造物の拡幅予定部に、曲率半
径が段階的に異なる複数個の刃口を順番に周方向
に組み込むと共に、同一曲率半径の複数個の刃口
を軸方向に組み込んで正面略〓形状のセグメント
を組みつけておき、先ず上記セグメントにおける
左右両側部の刃口に曲り矢板を接続し、これに他
の矢板を順次接続し、ジヤツキ等にて回転方向へ
推進させて土中に所要量押し込むと共に、当該矢
板は曲率半径が小さいものから順次上記刃口に接
続して土中に押し込み、次いで前に押し込んだ矢
板をガイドとして順次土中に押し込むことにより
拡幅部の径方向に隔壁部を構築し、その後、軸方
向の刃口に矢板を接続し、これに他の矢板を順次
接続して、かつ上記隔壁部の矢板をガイドとして
土中に押し込み、以下これを繰返して外周側隔壁
部を構築し、該外周側隔壁部と上記隔壁部に囲成
された部分を拡幅掘削するようにしたことを特徴
とする地下構築物拡幅工法。 ２ 矢板に囲成された部分のセグメントを取り除
き、補強しながら内部の掘削が実施されるように
した特許請求の範囲第１項記載の地下構築物拡幅
工法。[Claims] 1. In a method for widening existing structures and segment structures, a plurality of cutting edges with stepwise different radii of curvature are sequentially installed in the circumferential direction in a portion of the structure to be widened, and the same A segment with a roughly square front shape is assembled by incorporating multiple cutting edges with a radius of curvature in the axial direction, and first, curved sheet piles are connected to the cutting edges on both the left and right sides of the segment, and other sheet piles are sequentially attached to this. Connect the sheet piles and push them into the soil by the required amount by propelling them in the direction of rotation using jacks, etc., and connect the sheet piles in order from those with the smallest radius of curvature to the above-mentioned cutting edge and push them into the soil, and then push the previously pushed sheet piles into the soil. A partition wall is constructed in the radial direction of the widening section by sequentially pushing it into the soil as a guide, and then a sheet pile is connected to the cutting edge in the axial direction, and other sheet piles are sequentially connected to this, and the partition wall section is An underground structure characterized by pushing the sheet pile into the soil as a guide, repeating this process to construct an outer partition wall, and widening and excavating the area surrounded by the outer partition wall and the partition wall. Structure widening method. 2. The method for widening an underground structure according to claim 1, wherein the segment surrounded by the sheet pile is removed and reinforced while excavating the inside.