JP4874290B2 - Steel shell element construction method - Google Patents

Steel shell element construction method Download PDF

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JP4874290B2
JP4874290B2 JP2008111124A JP2008111124A JP4874290B2 JP 4874290 B2 JP4874290 B2 JP 4874290B2 JP 2008111124 A JP2008111124 A JP 2008111124A JP 2008111124 A JP2008111124 A JP 2008111124A JP 4874290 B2 JP4874290 B2 JP 4874290B2
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steel shell
shell element
penetrated
thrust transmission
transmission member
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JP2009263883A (en
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均 浅野
誠 請川
賢二 下坂
衛 斉藤
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Sanwa Kizai Co Ltd
Toda Corp
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Toda Corp
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本発明は、発進側に設置した元押しジャッキにより、角形断面の鋼殻エレメントを順次、貫入済みの鋼殻エレメントと連結させながら貫入する手順を繰り返すことにより、路線下に非開削によって前記鋼殻エレメントにより地下構造物を構築する鋼殻エレメントの構築方法に関する。   In the present invention, the steel shell element having a rectangular cross section is sequentially connected to the already-inserted steel shell element by the main push jack installed on the starting side, and the steel shell is thereby cut by non-cutting under the route. The present invention relates to a steel shell element construction method for constructing an underground structure using elements.

従来より、道路路線や鉄道路線の下方に立体交差するトンネルを構築する工法の１つとして、特殊な継手を有するとともに、１ｍ程度に分割された角形の鋼管を、継手をつなぎ合わせながら連続して土中に設置し、その鋼管内にコンクリートを充填して、それを部材とする構造物本体を構築し、その後に、構造物本体の内部の土砂を掘削し、構造物を仕上げる工法が知られている。   Conventionally, as one of the construction methods for constructing tunnels that cross three-dimensionally below road lines and railway lines, a square steel pipe that has a special joint and is divided into approximately 1 m is continuously connected while joining the joints. There is a known method of installing in the soil, filling the steel pipe with concrete, constructing the structure body using it as a member, and then excavating the soil inside the structure body to finish the structure. ing.

本出願人においても、下記特許文献１において、地上からの土留壁の施工が不可能な地盤内にシールド掘進機により、横坑（鋼殻エレメント）を掘削し、この横坑内に適宜厚さの覆工を施してトンネル構造体を構築し、このトンネル構造体により土留壁を構築するとともに、トンネル構造体の内部を作業空間としてトンネル構造体の下部に止水体を構築し、さらに前記土留壁の上部間の地盤中に適宜間隔をおいて横方向に並列して複数の横坑を掘削し、これら複数のトンネル構造体を連結して連続する内部空間を有する連結構造体を形成し、この連結構造体の両端を前記土留壁の上部に固定して上部荷重支持用の上部構造体を構築した後、前記複数の土留め壁及び連結構造体によって囲まれた地盤内を掘削した後、掘削された地下空間内に地中構造物を構築する方法を提案した。   Also in the present applicant, in Patent Document 1 below, a horizontal shaft (steel shell element) is excavated by a shield excavator in the ground where it is impossible to construct a retaining wall from the ground, and an appropriate thickness is formed in the horizontal shaft. A tunnel structure is constructed by lining, and a retaining wall is constructed by the tunnel structure, and a waterstop is constructed at the lower part of the tunnel structure with the inside of the tunnel structure as a work space. A plurality of horizontal shafts are excavated in parallel in the lateral direction at an appropriate interval in the ground between the upper parts, and a plurality of tunnel structures are connected to form a connection structure having a continuous internal space. After constructing the upper structure for supporting the upper load by fixing both ends of the structure to the upper part of the retaining wall, the structure is excavated after excavating the ground surrounded by the plurality of retaining walls and the connecting structure. In the underground space It has proposed a way to build the structure.

また、嵌合継手を取り付けた角形鋼管エレメントを相互に連結しながら、順次地中に推進して土留め構造物を構築する方法も行われている（例えば、下記非特許文献１）。   In addition, a method of constructing the earth retaining structure by sequentially propelling into the ground while connecting the square steel pipe elements to which the fitting joint is attached is also performed (for example, Non-Patent Document 1 below).

前記鋼殻エレメントや角形鋼管エレメントなどを地山に貫入させる方法としては、到達立坑に設置した牽引ジャッキにより予め地山に埋設したＰＣ鋼線を介してエレメントを地山に引き込む牽引工法と、発進立坑に設けた元押しジャッキによりエレメントを地山に押し込む元押し工法とがある。
特開平８−８６１９７号公報 半田卓・下田勝彦、「重要構造物直下における角形鋼管推進工事」、建設の機械化、社団法人日本建設機械化協会、2003年3月、p.42-46 The steel shell element, square steel pipe element, etc. are penetrated into the natural ground by a pulling method in which the element is pulled into the natural ground via a PC steel wire embedded in the natural ground in advance by a pulling jack installed in the reach shaft. There is a main pushing method in which an element is pushed into a natural ground by a main pushing jack provided in a vertical shaft.
JP-A-8-86197 Handa Taku, Katsuhiko Shimoda, “Protrusion of square steel pipes directly under important structures”, Mechanization of construction, Japan Construction Mechanization Association, March 2003, p.42-46

しかしながら、前記鋼殻エレメントを発進立坑に設けた元押しジャッキによりエレメントを地山に押し込む元押し工法の場合は、牽引工法に比べ、前面の掘削断面に制約が少ない分、地下水に対して密閉性が高くかつ前面の掘削抵抗を抑制できるメリットがある反面、鋼殻エレメント自体に圧縮力が作用するため、応力負担が大きく鋼殻エレメントの座屈補強を必要とするなどの問題があった。また、掘進ガイドが無いため、掘削機の姿勢制御に依存した施工となり、施工誤差及び掘削時間が増大する原因となっていた。更には、鋼殻エレメント間に未掘削部分が残り、後工程でウォータージェット等による除去作業を必要とするなどの問題もあった。   However, in the case of the main pushing method in which the steel shell element is pushed into the ground using a jacking jack provided in the starting shaft, it has less restrictions on the excavation cross section on the front than the traction method, and is sealed against groundwater. However, there is a merit that the excavation resistance on the front surface can be suppressed. On the other hand, since the compressive force acts on the steel shell element itself, there is a problem that the stress load is large and the buckling reinforcement of the steel shell element is required. Further, since there is no excavation guide, the construction depends on the attitude control of the excavator, which causes a construction error and an excavation time to increase. Furthermore, there is a problem that an unexcavated portion remains between the steel shell elements, and a removal operation by a water jet or the like is required in a subsequent process.

そこで本発明の主たる課題は、発進側に設置した元押しジャッキにより、角形断面の鋼殻エレメントを順次、貫入済みの鋼殻エレメントと連結させながら貫入する手順を繰り返すことにより、路線下に非開削によって前記鋼殻エレメントにより地下構造物を構築する鋼殻エレメントの構築方法において、鋼殻エレメントの応力負担を軽減し補強対策を不要とすること、鋼殻エレメントの施工精度の向上及び掘削時間の短縮を図ること、更には鋼殻エレメント間の未掘削部を無くし、施工の効率化を図ることにある。   Therefore, the main problem of the present invention is to repeat the procedure of penetrating the steel shell elements having a square cross-section in order by connecting them with the steel shell elements that have already been penetrated by the main jack installed on the starting side, so In the steel shell element construction method for constructing an underground structure using the steel shell element, the stress burden on the steel shell element is reduced and no reinforcement measures are required, the construction accuracy of the steel shell element is improved, and the excavation time is shortened. In addition, there is no unexcavated portion between the steel shell elements to improve the efficiency of construction.

前記課題を解決するために請求項１に係る本発明として、発進側に元押しジャッキを設置し、角形断面の鋼殻エレメントを順次、貫入済みの鋼殻エレメントと連結させながら貫入する手順を繰り返し、前記鋼殻エレメントにより地下構造物を構築する鋼殻エレメントの構築方法において、
先行して貫入させた鋼殻エレメントの１側面に所定長さの推力伝達部材が縦列的に付設されている状態から、この貫入済みの鋼殻エレメントに付設された推力伝達部材と隣接する側において、掘削装置を貫入済みの鋼殻エレメントに付設された推力伝達部材と連結した後、順次所定長さの鋼殻エレメントを後続させるとともに、貫入済みの鋼殻エレメントと連結させた状態とし、かつ前記貫入済みの鋼殻エレメントに付設された推力伝達部材に順次所定長さの推力伝達部材を後続させるとともに、貫入させる鋼殻エレメントの１側面に順次所定長さの推力伝達部材を付設しながら、これら２箇所に配置された推力伝達部材を前記元押しジャッキによって押込み、鋼殻エレメントを間接的に牽引しながら貫入させる手順を順次繰り返すことを特徴とする鋼殻エレメントの構築方法が提供される。 In order to solve the above-mentioned problem, as the present invention according to claim 1, a procedure is adopted in which a push-in jack is installed on the starting side and the steel shell elements having a square cross section are sequentially inserted while being connected to the steel shell elements that have already been penetrated. In the method for constructing a steel shell element for constructing an underground structure with the steel shell element,
From a state in which a thrust transmission member having a predetermined length is vertically attached to one side surface of the steel shell element that has been penetrated in advance, on the side adjacent to the thrust transmission member attached to the steel shell element that has already been penetrated , After connecting the drilling device with the thrust transmission member attached to the penetrated steel shell element, sequentially followed by the steel shell element of a predetermined length, and connected to the penetrated steel shell element, and The thrust transmission member attached to the penetrated steel shell element is sequentially followed by a thrust transmission member having a predetermined length, and the thrust transmission member having a predetermined length is sequentially attached to one side surface of the steel shell element to be penetrated. The thrust transmission members arranged at two locations are pushed in by the former push jack, and the procedure of inserting the steel shell element while indirectly pulling it is repeated. Method for constructing a steel shell elements to are provided.

請求項２に係る本発明として、前記鋼殻エレメントを断面視で矩形状に閉合させて地下構造物を構築する請求項１記載の鋼殻エレメントの構築方法が提供される。   As a second aspect of the present invention, there is provided a method for constructing a steel shell element according to claim 1, wherein the steel shell element is closed in a rectangular shape in cross-sectional view to construct an underground structure.

請求項３に係る本発明として、発進側に元押しジャッキを設置し、角形断面の鋼殻エレメントを順次、貫入済みの鋼殻エレメントと連結させながら貫入する手順を繰り返し、前記鋼殻エレメントにより地下構造物を構築する鋼殻エレメントの構築方法において、
最初に貫入させる鋼殻エレメントの施工は、先端の掘削装置に、順次所定長さの鋼殻エレメントを後続させるとともに、鋼殻エレメントの２側面に順次所定長さの推力伝達部材を付設しながら、前記対の推力伝達部材を前記元押しジャッキによって押込んで鋼殻エレメントを貫入させ、
次順以降に貫入させる鋼殻エレメントの施工は、貫入済みの鋼殻エレメントに付設された推力伝達部材と隣接する側とし、掘削装置を貫入済みの鋼殻エレメントに付設された推力伝達部材と連結した後、順次所定長さの鋼殻エレメントを後続させるとともに、貫入済みの鋼殻エレメントと連結させた状態とし、かつ前記貫入済みの鋼殻エレメントに付設された推力伝達部材に順次所定長さの推力伝達部材を後続させるとともに、貫入させる鋼殻エレメントの１側面に順次所定長さの推力伝達部材を付設しながら、これら２箇所に配置された推力伝達部材を前記元押しジャッキによって押込み、鋼殻エレメントを間接的に牽引しながら貫入させる手順を順次繰り返すことを特徴とする鋼殻エレメントの構築方法が提供される。 As a third aspect of the present invention, a main jack is installed on the starting side, and a procedure of sequentially inserting the steel shell elements having a square cross section while being connected to the already inserted steel shell elements is repeated by the steel shell elements. In the construction method of the steel shell element for constructing the structure,
The construction of the steel shell element to be penetrated first is made by sequentially following the steel shell element of a predetermined length to the excavator at the tip, and sequentially attaching a thrust transmission member of a predetermined length on the two side surfaces of the steel shell element, The pair of thrust transmission members are pushed in by the former push jack to penetrate the steel shell element,
The construction of the steel shell element to be penetrated from the next order is on the side adjacent to the thrust transmission member attached to the penetrated steel shell element, and the excavator is connected to the thrust transmission member attached to the penetrated steel shell element. After that, the steel shell element having a predetermined length is sequentially followed, and is connected to the penetrated steel shell element, and the thrust transmission member attached to the penetrated steel shell element is sequentially provided to the thrust transmission member. While the thrust transmission member is made to follow and a thrust transmission member having a predetermined length is sequentially attached to one side of the steel shell element to be penetrated, the thrust transmission members arranged at these two locations are pushed in by the main push jack, There is provided a method for constructing a steel shell element, characterized by sequentially repeating a procedure of penetrating the element while indirectly pulling the element.

請求項４に係る本発明として、前記鋼殻エレメントを断面視で矩形状に閉合させて地下構造物を構築する請求項３記載の鋼殻エレメントの構築方法が提供される。   As a fourth aspect of the present invention, there is provided a method for constructing a steel shell element according to claim 3, wherein the steel shell element is closed in a rectangular shape in a sectional view to construct an underground structure.

上記請求項１〜４いずれかに記載の発明においては、元押しジャッキによる元押し工法を採用するけれども、鋼殻エレメントは間接的な牽引方式となるため、発生応力が引張力となるため、鋼殻の補強対策が不要となり、製作コストの低減が図れるようになる。また、２箇所に配置された推力伝達部材の内、貫入済みの鋼殻エレメントに付設された推力伝達部材は、掘進ガイドを兼ねるものであり、掘削装置の姿勢制御が不要となり、施工精度の向上及び掘進速度の向上を図り得るようになる。更には、鋼殻エレメント間には、推力伝達部材が縦列的に配設されるため、鋼殻エレメント間に未掘削部を残さない。従って、ウォータージェット等による土砂除去作業などの後工程を省略することができるようになる。   In the invention according to any one of the first to fourth aspects, the main pushing method using the main pushing jack is adopted. However, since the steel shell element is an indirect traction method, the generated stress becomes a tensile force. There is no need to reinforce the shell, and the production cost can be reduced. Of the thrust transmission members arranged at two locations, the thrust transmission member attached to the penetrated steel shell element also serves as an excavation guide, which eliminates the need for attitude control of the excavator and improves construction accuracy. In addition, the excavation speed can be improved. Furthermore, since thrust transmission members are arranged in cascade between the steel shell elements, no unexcavated portion remains between the steel shell elements. Accordingly, it is possible to omit a post-process such as a sediment removal operation using a water jet or the like.

請求項５に係る本発明として、前記最初に貫入させる鋼殻エレメントの施工前に、予め小口径推進機によりガイド鋼管を設置しておき、このガイド鋼管を前記掘削装置の先端に連結し、ガイド鋼管を押出しながら鋼殻エレメントの貫入を行うようにする請求項３、４いずれかに記載の鋼殻エレメントの構築方法が提供される。   As the present invention according to claim 5, a guide steel pipe is installed in advance by a small-diameter propulsion machine before the construction of the first steel shell element to be penetrated, and the guide steel pipe is connected to the tip of the excavator, 5. A method for constructing a steel shell element according to claim 3, wherein the steel shell element is penetrated while the steel pipe is extruded.

上記請求項５記載の発明においては、最初に貫入させる鋼殻エレメントの施工精度を確保するための方法である。予め、小口径推進機によりガイド鋼管を設置しておき、このガイド鋼管を前記掘削装置の先端に連結し、ガイド鋼管を押出しながら鋼殻エレメントの貫入を行うようにすれば、最初に貫入させる鋼殻エレメントを高い施工精度で貫入することができる。   The invention according to claim 5 is a method for ensuring the construction accuracy of the steel shell element to be penetrated first. If a guide steel pipe is installed in advance by a small-diameter propulsion machine, this guide steel pipe is connected to the tip of the excavator, and the steel shell element is penetrated while pushing out the guide steel pipe, the steel to be introduced first The shell element can be penetrated with high construction accuracy.

請求項６に係る本発明として、前記鋼殻エレメントの単位長さと、前記推力伝達部材の単位長さとを同じとしてある請求項１〜５いずれかに記載の鋼殻エレメントの構築方法が提供される。   The present invention according to claim 6 provides the method for constructing a steel shell element according to any one of claims 1 to 5, wherein the unit length of the steel shell element is the same as the unit length of the thrust transmission member. .

上記請求項６記載の発明では、前記鋼殻エレメントの単位長さと、前記推力伝達部材の単位長さとを同じに設定するものである。すなわち、鋼殻エレメントの単位長さに推力伝達部材の単位長さを合わせるようにすることで、１サイクル毎に発生する元押しジャッキ部における後続部材の接続作業を効率化することができる。   In the invention described in claim 6, the unit length of the steel shell element and the unit length of the thrust transmission member are set to be the same. That is, by matching the unit length of the thrust transmission member with the unit length of the steel shell element, it is possible to improve the efficiency of connecting the subsequent member in the main push jack portion that occurs every cycle.

請求項７に係る本発明として、多数の鋼殻エレメントを矩形状に閉合させた矩形断面の内、上端隅角部の鋼殻エレメントを最初に貫入させ、次いで水平方向に沿って順次鋼殻エレメントを貫入させて上床版となる部分を構築した後、上床版の両端部に位置する鋼殻エレメントから下側方向に向かって順次鋼殻エレメントを貫入させて側壁を構築し、次いで下端隅角部の鋼殻エレメントから順次水平方向に沿って順次鋼殻エレメントを貫入させて下床版となる部分を構築する手順によって、多数の鋼殻エレメントを断面視で矩形状に閉合させる請求項３，４いずれかに記載の鋼殻エレメントの構築方法が提供される。   In the present invention according to claim 7, among the rectangular cross-sections in which a number of steel shell elements are closed in a rectangular shape, the steel shell elements at the upper corners are first penetrated, and then the steel shell elements are sequentially introduced along the horizontal direction. After building the part that becomes the upper floor slab, penetrate the steel shell element sequentially from the steel shell element located at both ends of the upper floor slab toward the lower side to construct the side wall, and then the lower corner A plurality of steel shell elements are closed in a rectangular shape in cross-sectional view by a procedure for constructing a part that becomes a lower floor slab by sequentially intruding the steel shell elements from the steel shell elements sequentially in the horizontal direction. A method for constructing a steel shell element according to any of the above is provided.

上記請求項７記載の発明は、多数の鋼殻エレメントを断面視で矩形状に閉合させた地下構造物を構築する、好ましい貫入手順の１例を示したものである。   The invention described in claim 7 shows an example of a preferable intrusion procedure for constructing an underground structure in which a number of steel shell elements are closed in a rectangular shape in cross-sectional view.

以上詳説のとおり本発明によれば、鋼殻エレメントの応力負担を軽減し補強対策を不要にできるとともに、鋼殻エレメントの施工精度の向上及び掘削時間の短縮を図ることが可能となる。更には、鋼殻エレメント間の未掘削部を無くし、施工の効率化を図ることが可能となる。   As described above in detail, according to the present invention, it is possible to reduce the stress burden on the steel shell element and eliminate the need for reinforcement measures, and to improve the construction accuracy of the steel shell element and shorten the excavation time. Further, it is possible to eliminate the unexcavated portion between the steel shell elements and to improve the construction efficiency.

以下、本発明の実施の形態について図面を参照しながら詳述する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明に従って構築される地下構造物１の断面図であり、図２〜図５はそれぞれ地下構造物１の要部断面図である。   FIG. 1 is a cross-sectional view of an underground structure 1 constructed according to the present invention, and FIGS. 2 to 5 are cross-sectional views of main parts of the underground structure 1.

本発明は、図１に示されるように、道路路線や鉄道路線などの路線下の地盤に、鋼殻エレメント２〜５（以下、単にエレメントともいう。）を断面視で矩形状に閉合させた地下構造物１を構築し、内部の土砂を掘削することによりアンダーパストンネルを構築するためのものである。   In the present invention, as shown in FIG. 1, steel shell elements 2 to 5 (hereinafter also simply referred to as elements) are closed in a rectangular shape in a cross-sectional view on the ground below a road line, a railway line, or the like. It is for constructing an underpass tunnel by constructing the underground structure 1 and excavating the internal sediment.

鋼殻エレメント２〜５は、断面形状及び貫入要領の違いによって、最初に貫入させる開始エレメント２と、上床版、側壁及び下床版の中間部分に配置される標準エレメント３、３…と、３つの隅角部に配置される調整エレメント４，４…と、閉合エレメント５の４種類の鋼殻エレメントに分類される。なお、各鋼殻エレメント２〜５の内部に付した番号は、貫入順序を示したものである。   The steel shell elements 2 to 5 are divided into a starting element 2 to be initially penetrated, and standard elements 3, 3... Are classified into four types of steel shell elements: adjustment elements 4, 4... Arranged at one corner and a closing element 5. In addition, the number attached | subjected to the inside of each steel shell element 2-5 shows the penetration order.

前記開始エレメント２は、図２に示されるように、上板２０，下板２１及び側板２２，２３によって構成される矩形断面の鋼殻エレメントである。右側面において、上板２０及び下板２１を外方に延在させることにより、推力伝達部材６の設置空間が形成されているとともに、下面側において、側板２２を下方側に延在させるとともに、追加的に設けられた垂直突出片２４により、推力伝達部材６の設置空間が形成されている。そして、前記右側面において、前記上板２０，下板２１の端部外面には溝型鋼等による雌継手７、７が設けられ、前記下面側において、前記側板２２，２３の端部外面に同じく溝型鋼等による雌継手７、７が設けられている。なお、前記推力伝達部材６は、鋼殻エレメント２〜５の貫入時に使用されるものであり、使用後は回収され転用される部材である。図示された推力伝達部材６は、矩形断面の形材を溶接等によって連結した板状体が使用されているが、所定の圧縮強度性能が確保されていれば、板材の組合せによって構成された板状体としてもよい。また、フッ素系樹脂等による表面処理を施し、周面摩擦を低減させるようにするのが望ましい。   As shown in FIG. 2, the starting element 2 is a steel shell element having a rectangular cross section constituted by an upper plate 20, a lower plate 21, and side plates 22 and 23. On the right side surface, the upper plate 20 and the lower plate 21 are extended outward to form an installation space for the thrust transmission member 6, and on the lower surface side, the side plate 22 extends downward, An installation space for the thrust transmission member 6 is formed by the additionally provided vertical projecting piece 24. And, on the right side surface, female joints 7 and 7 made of channel steel or the like are provided on the outer end surfaces of the upper plate 20 and the lower plate 21, and on the lower surface side, the same as the outer end portions of the side plates 22 and 23. Female joints 7 and 7 made of groove steel or the like are provided. In addition, the said thrust transmission member 6 is used at the time of penetration of the steel shell elements 2-5, and is a member collect | recovered and diverted after use. The thrust transmission member 6 shown in the figure uses a plate-like body in which rectangular cross-sections are connected by welding or the like. However, if a predetermined compressive strength performance is ensured, a plate constituted by a combination of plate members is used. It is good also as a shape. In addition, it is desirable to perform surface treatment with a fluorine-based resin or the like so as to reduce peripheral friction.

前記標準エレメント３は、図３に示されるように、上板３０、下板３１及び一方側側板３２とからなる鋼殻エレメントである。右側面において、上板３０及び下板３１を外方に延在させることにより、推力伝達部材６の設置空間が形成されているとともに、外面側には前記上板３０，下板３１に溝型鋼による雌継手７、７が設けられている。また、先行して貫入された鋼殻エレメント３との連結側（左側面の開口部）には、上板３０及び下板３１の端部内面にそれぞれ、推力伝達部材６の押え材９、９となる不等辺形鋼が配置されているとともに、上板３０及び下板３１の外面端部に雄継手８、８が設けられている。   As shown in FIG. 3, the standard element 3 is a steel shell element including an upper plate 30, a lower plate 31, and one side plate 32. On the right side, the upper plate 30 and the lower plate 31 are extended outward to form an installation space for the thrust transmission member 6. On the outer side, the upper plate 30 and the lower plate 31 are grooved steel. Female joints 7 and 7 are provided. Further, on the connecting side (opening portion on the left side surface) with the steel shell element 3 penetrated in advance, the pressing members 9 and 9 of the thrust transmission member 6 are respectively provided on the inner surfaces of the end portions of the upper plate 30 and the lower plate 31. And the male joints 8 and 8 are provided at the outer surface end portions of the upper plate 30 and the lower plate 31.

前記調整エレメント４（代表的に、No.４４エレメント）は、図４に示されるように、下板４０，側板４１，４２とからなる鋼殻エレメントである。左側面において、追加的に設けられた水平突出片４２と下板４０の延在片とによって推力伝達部材６の設置空間が形成されているとともに、前記水平突出片４２と下板４０の外面に雌継手７，７が設けられている。また、先行して貫入された鋼殻エレメント３との連結側（上面側の開口部）には、側板４１，４２の端部内面にそれぞれ、推力伝達部材６の押え材９，９となる不等辺形鋼が配置されているとともに、外面側に雄継手８、８が設けられている。   The adjustment element 4 (typically No. 44 element) is a steel shell element comprising a lower plate 40 and side plates 41 and 42 as shown in FIG. On the left side surface, a space for installing the thrust transmission member 6 is formed by the additionally provided horizontal protruding piece 42 and the extended piece of the lower plate 40, and on the outer surface of the horizontal protruding piece 42 and the lower plate 40. Female joints 7 and 7 are provided. Further, on the connection side (opening portion on the upper surface side) with the steel shell element 3 that has been penetrated in advance, the inner surfaces of the end portions of the side plates 41 and 42 are not used as the presser members 9 and 9 of the thrust transmission member 6, respectively. While equilateral steel is arranged, male joints 8 and 8 are provided on the outer surface side.

前記閉合エレメント５は、図５に示されるように、上板５０と下板５１とからなる鋼殻エレメントである。右側面には、上板５０と下板５１の端部内面に夫々、推力伝達部材押え材９，９が設けられているとともに、外面側に雄継手８，８が設けられている。また、左側面にも同様に、上板５０と下板５１の端部内面に夫々、推力伝達部材押え材９，９が設けられているとともに、外面側に雄継手８，８が設けられている。   As shown in FIG. 5, the closing element 5 is a steel shell element composed of an upper plate 50 and a lower plate 51. On the right side, thrust transmission member pressing members 9 and 9 are provided on the inner surfaces of the end portions of the upper plate 50 and the lower plate 51, respectively, and male joints 8 and 8 are provided on the outer surface side. Similarly, on the left side surface, thrust transmission member pressing members 9 and 9 are provided on the inner surfaces of the end portions of the upper plate 50 and the lower plate 51, respectively, and male joints 8 and 8 are provided on the outer surface side. Yes.

なお、前記上板同士の接合部、側板同士の接合部、下板同士の接合部は、貫入後に自動溶接機等によって部材長手方向によって溶接され一体化される。   The joints between the upper plates, the joints between the side plates, and the joints between the lower plates are welded and integrated in the longitudinal direction of the member by an automatic welding machine or the like after penetration.

次に、前述した鋼殻エレメント２〜５の貫入要領について、図６に基づき詳述する。なお、図６は標準エレメント３の貫入要領を示したものである。   Next, the penetration procedure of the steel shell elements 2 to 5 will be described in detail with reference to FIG. FIG. 6 shows the penetration procedure of the standard element 3.

図６において、先行して貫入させた鋼殻エレメント３１の１側面に所定長さの推力伝達部材６、６…が縦列的に付設されている状態から、この貫入済みの鋼殻エレメント３１に付設された推力伝達部材６，６…と隣接する側において、掘削装置１０を貫入済みの鋼殻エレメント３１に付設された推力伝達部材６と連結した後、順次所定長さの鋼殻エレメント３２を後続させるとともに、貫入済みの鋼殻エレメント３１と連結させた状態とし、かつ前記貫入済みの鋼殻エレメント３１に付設された推力伝達部材６１、６１…に順次所定長さの推力伝達部材６１を後続させるとともに、貫入させる鋼殻エレメント３２の１側面に順次所定長さの推力伝達部材６２を付設しながら、これら２箇所に配置された推力伝達部材６１，６２を元押しジャッキ１１によって押込み、鋼殻エレメント３２を間接的に牽引しながら貫入させる手順を順次繰り返すようにする。ここで、２箇所に配置された推力伝達部材６１，６２の内、貫入済みの鋼殻エレメント３１に付設された推力伝達部材６１は、掘進ガイドを兼ねるものであり、掘削装置１０の姿勢制御が容易となり、施工精度の向上及び掘進速度の向上を図り得るようになる。また、前記鋼殻エレメント３は、間接的な牽引方式となるため、発生応力が引張力となり、鋼殻エレメント３の補強対策が不要となり、製作コストの低減が図れる。更には、鋼殻エレメント３１，３２間には、推力伝達部材６，６…が縦列的に配設されることになるため、鋼殻エレメント３１，３２間に未掘削部を残さない施工となる。従って、ウォータージェット等による土砂除去作業などの後工程を省略することができ、施工の効率化が図れるようになる。 6, from the preceding to a state in which one side of the steel shell element 3 1 which has penetrated a predetermined length of the thrust transmission member 6, 6 ... are attached to the columns, this penetration already steel shell element 3 1 after coupling attached to the thrust transmission member 6, 6 ... and in the adjacent side, the thrust transmission member 6 is attached drilling apparatus 10 to penetrate already steel shell element 3 1, sequentially a predetermined length steel shell element 3 2 with the to follow, the state of being connected with the penetration already steel shell elements 3 1 and the penetration already steel shell element 3 thrust transmission member 61 which is attached to the 1, 6 successively a predetermined length 1 ... in of causes followed the thrust transmission member 61 of, while sequentially attaching a thrust transmission member 6 2 of a predetermined length to one aspect of the steel shell element 3 2 to penetrate, the thrust transmission member 61 arranged in these two locations, 6 2 based Pushing the pushing jack 11, to sequentially repeat the procedure for penetration while indirectly lead the steel shell element 3 2. Here, 1 thrust transmission member 6 disposed at two positions, out of 6 2, the thrust transmission member 61 which is attached to penetration already steel shell element 3 1 is to serve as the tunneling guide rigs 10 Therefore, it is possible to improve the construction accuracy and the excavation speed. In addition, since the steel shell element 3 is an indirect traction method, the generated stress becomes a tensile force, and no reinforcement measures for the steel shell element 3 are required, so that the manufacturing cost can be reduced. Furthermore, the steel shell element 3 1, 3 between 2, this means that the thrust transmission member 6, 6 ... are tandemly arranged, the non-excavation left between the steel shell element 3 1, 3 2 There will be no construction. Therefore, a post-process such as earth and sand removal work by a water jet or the like can be omitted, and the construction efficiency can be improved.

前記掘削装置１０としては、例えば図７及び図８に示される掘削装置を使用することができる。図示された掘削装置１０は、密閉型の掘削装置であり、地下水位以下でも地盤改良無しに地下構造物１の施工が行えるようにしたものである。前述した鋼殻エレメント２〜５とほぼ同等の断面形状を成し、オーガースクリュー１４の先端に設けられたメインカッター１２と共に、所定数の遊星カッター１３、１３を備え、矩形断面に掘削を行う。排土方式はスクリューコンベア方式である。四隅にはそれぞれ継手部カッター１５，１５が着脱自在とされる。図示の鋼殻エレメント貫入時には、非連結側となる上下隅角部位置に継手部カッター１５，１５が備えられている。   As the excavator 10, for example, the excavator shown in FIGS. 7 and 8 can be used. The illustrated excavating apparatus 10 is a hermetic excavating apparatus, and can perform the construction of the underground structure 1 without ground improvement even below the groundwater level. The cross-sectional shape is substantially the same as that of the steel shell elements 2 to 5 described above, and a predetermined number of planetary cutters 13 and 13 are provided together with the main cutter 12 provided at the tip of the auger screw 14, and excavation is performed on a rectangular cross section. The soil removal method is a screw conveyor method. Joint cutters 15 and 15 are detachable at the four corners, respectively. At the time of penetration of the illustrated steel shell element, joint cutters 15 are provided at the upper and lower corner positions on the non-connecting side.

次に、前記地下構造物１を構築する手順に従いながら、図１及び図９〜図１７に基づいて、各鋼殻エレメント２〜５の貫入要領について詳述する。   Next, while following the procedure for constructing the underground structure 1, the penetration procedure of the steel shell elements 2 to 5 will be described in detail based on FIGS. 1 and 9 to 17.

鋼殻エレメント２〜５の貫入手順は、図１に示される地下構造物１の断面図にNo.１〜No.３４の番号を付した順序とする。すなわち、多数の鋼殻エレメント２〜５を矩形状に閉合させた矩形断面の内、上端隅角部の鋼殻エレメント２（No.１：開始エレメント）を最初に貫入させ、次いで水平方向に沿って順次鋼殻エレメント３，３…を貫入させて上床版１Ａとなる部分を構築した後、上床版１Ａの両端部に位置する鋼殻エレメント１，４（No.１：開始エレメント、No.11：調整エレメント）から下側方向に向かって順次鋼殻エレメント３，３…を貫入させて側壁１Ｃ、１Ｄを構築し、次いで下端隅角部の鋼殻エレメント４（No.24：調整エレメント）から順次水平方向に沿って順次鋼殻エレメント３，３…を貫入させ、最後に閉合エレメント５を貫入させて下床版１Ｂとなる部分を構築する手順によって、多数の鋼殻エレメント２〜５によって断面視で矩形状に閉合させた地下構造物１を構築する。   The penetration procedure of the steel shell elements 2 to 5 is the order in which the numbers No. 1 to No. 34 are attached to the cross-sectional view of the underground structure 1 shown in FIG. That is, the steel shell element 2 (No. 1: start element) at the upper corner of the rectangular cross section obtained by closing a number of steel shell elements 2 to 5 in a rectangular shape is first penetrated, and then along the horizontal direction. After the steel shell elements 3, 3... Are sequentially inserted into the upper floor slab 1A, the steel shell elements 1, 4 (No. 1: start element, No. 11) located at both ends of the upper floor slab 1A are constructed. : Steel elements 3, 3... Are sequentially penetrated from the adjustment element) toward the lower side to construct the side walls 1C, 1D, and then from the steel shell element 4 (No. 24: adjustment element) at the lower corner. The steel shell elements 3, 3... Are sequentially penetrated along the horizontal direction, and finally the closing element 5 is penetrated to construct a portion to become the lower floor slab 1B. Close in a rectangular shape Build underground structure 1.

前記上端隅角部の鋼殻エレメント２（No.１：開始エレメント）を貫入させる前に、図９に示されるように、予め、元押しジャッキ１８を用い、小口径推進掘削機１６によりガイド鋼管１７，１７…を設置しておく。次いで、図１０に示されるように、ガイド鋼管１７，１７…を掘削装置１０の先端に連結した後、ガイド鋼管１７，１７…を押出しながら鋼殻エレメント２の貫入を行うようにする。この際、推力伝達部材６は、鋼殻エレメント２の下面側と右側面とに付設する。到達立坑に到達したならば、図１１に示されるように、掘削装置１０を回収する。なお、鋼殻エレメント２の断面は、標準エレメント３よりも下側部分が突出しているため、掘削装置１０の刃***換やコーナーカッターの増設等によって断面寸法を調整する。   Before penetrating the steel shell element 2 (No. 1: start element) at the upper corner, the guide steel pipe is previously used by a small-diameter propulsion excavator 16 using a main jack 18 as shown in FIG. 17, 17 ... are installed. Then, as shown in FIG. 10, after the guide steel pipes 17, 17... Are connected to the tip of the excavator 10, the steel shell element 2 is penetrated while the guide steel pipes 17, 17. At this time, the thrust transmission member 6 is attached to the lower surface side and the right side surface of the steel shell element 2. When the reaching shaft is reached, the excavator 10 is recovered as shown in FIG. Since the lower part of the cross section of the steel shell element 2 protrudes from the standard element 3, the cross sectional dimension is adjusted by exchanging the blade edge of the excavator 10 or adding a corner cutter.

次に、図１２に示されるように、貫入済みの鋼殻エレメント２に付設された右側面の推力伝達部材６と隣接する鋼殻エレメント３（標準エレメント）を貫入させる。貫入要領は前述したとおりである。以降は、図１３〜図１５に示されるように、水平方向に沿って順次、鋼殻エレメント３，３…（No.2〜10：標準エレメント）及び鋼殻エレメント４（No.11：調整エレメント）を貫入させて上床版１Ａとなる部分を構築する。上床版１Ａの最終貫入エレメントとなる鋼殻エレメント４（No.11：調整エレメント）の貫入時には、下面側に推力伝達部材６，６…を付設する。   Next, as shown in FIG. 12, the steel shell element 3 (standard element) adjacent to the thrust transmission member 6 on the right side surface attached to the steel shell element 2 that has been penetrated is inserted. The point of penetration is as described above. Thereafter, as shown in FIGS. 13 to 15, the steel shell elements 3, 3... (No. 2 to 10: standard element) and the steel shell element 4 (No. 11: adjustment element) are sequentially arranged along the horizontal direction. ) Is penetrated to construct the upper floor slab 1A. When the steel shell element 4 (No. 11: adjustment element) which is the final penetration element of the upper floor slab 1A is penetrated, thrust transmission members 6, 6.

上床版１Ａの構築を終えたならば、次に側壁１Ｃ、１Ｄを構築する。   When the construction of the upper floor slab 1A is finished, the side walls 1C and 1D are constructed.

前記鋼殻エレメント２，４の下面側には、推力伝達部材６，６…が付設された状態となっているため、図１６に示されるように、鋼殻エレメント３（標準エレメント）を９０度反転させた状態とし、下方向に向かって順次貫入を行う。   Since the thrust transmission members 6, 6... Are attached to the lower surface side of the steel shell elements 2, 4, the steel shell element 3 (standard element) is 90 degrees as shown in FIG. The state is reversed, and penetration is sequentially performed downward.

下床版１Ｂの下端隅角部の鋼殻エレメント４（No.24：調整エレメント）を貫入させたならば、順次水平方向に沿って順次鋼殻エレメント３，３…（No.25〜32：標準エレメント）を貫入させた後、側壁１Ｄの下側となる鋼殻エレメント４（No.33：調整エレメント）を貫入し、最後に鋼殻エレメント５（No.34：閉合エレメント）を貫入して下床版１Ｂを構築し、矩形状に閉合させる。なお、鋼殻エレメント５（No.34：閉合エレメント）の雄継手８と嵌合させる雌継手７，７については、図５に示されるように、拘束の無い断面Ｌ字状部材とし、施工誤差を吸収させるようにする。   If the steel shell element 4 (No. 24: adjustment element) at the lower corner of the lower floor slab 1B is penetrated, the steel shell elements 3, 3 ... sequentially in the horizontal direction (No. 25 to 32: After inserting the standard element), the steel shell element 4 (No.33: adjustment element) on the lower side of the side wall 1D is inserted, and finally the steel shell element 5 (No.34: closing element) is inserted. The lower floor slab 1B is constructed and closed into a rectangular shape. In addition, about the female joints 7 and 7 fitted with the male joint 8 of the steel shell element 5 (No. 34: closing element), as shown in FIG. To absorb.

〔他の形態例〕
(1)上記形態例では、上床版１Ａ、両側壁１Ｃ、１Ｄ、下床版１Ｂの順で構築したが、逆の手順、すなわち下床版１Ｂ、両側壁１Ｃ、１Ｄ、上床版１Ａの順で構築するようにしてもよい。 [Other examples]
(1) In the above embodiment, the upper floor slab 1A, both side walls 1C, 1D, and the lower floor slab 1B are constructed in this order, but the reverse procedure, that is, the lower floor slab 1B, both side walls 1C, 1D, and the upper floor slab 1A You may make it build with.

本発明に従って構築される地下構造物１の断面図である。It is sectional drawing of the underground structure 1 constructed | assembled according to this invention. 鋼殻エレメント２（開始エレメント）の断面図である。It is sectional drawing of the steel shell element 2 (starting element). 鋼殻エレメント３（標準エレメント）の断面図である。It is sectional drawing of the steel shell element 3 (standard element). 鋼殻エレメント４（調整エレメント）の断面図である。It is sectional drawing of the steel shell element 4 (adjustment element). 鋼殻エレメント５（閉合エレメント）の断面図である。It is sectional drawing of the steel shell element 5 (closing element). 本発明に係る鋼殻エレメント３の貫入要領を示す斜視図である。It is a perspective view which shows the penetration procedure of the steel shell element 3 which concerns on this invention. 掘削装置１０の正面図である。1 is a front view of a drilling device 10. FIG. 掘削装置１０の縦断面図である。1 is a longitudinal sectional view of a drilling device 10. FIG. 地下構造物１の施工手順（その１）を示す斜視図である。It is a perspective view which shows the construction procedure (the 1) of the underground structure. 地下構造物１の施工手順（その２）を示す斜視図である。It is a perspective view which shows the construction procedure (the 2) of the underground structure 1. 地下構造物１の施工手順（その３）を示す斜視図である。It is a perspective view which shows the construction procedure (the 3) of the underground structure 1. 地下構造物１の施工手順（その４）を示す斜視図である。It is a perspective view which shows the construction procedure (the 4) of the underground structure 1. 地下構造物１の施工手順（その５）を示す斜視図である。It is a perspective view which shows the construction procedure (the 5) of the underground structure 1. 地下構造物１の施工手順（その６）を示す斜視図である。It is a perspective view which shows the construction procedure (the 6) of the underground structure 1. 地下構造物１の施工手順（その７）を示す斜視図である。It is a perspective view which shows the construction procedure (the 7) of the underground structure 1. 地下構造物１の施工手順（その８）を示す斜視図である。It is a perspective view which shows the construction procedure (the 8) of the underground structure 1. 地下構造物１の施工手順（その９）を示す斜視図である。It is a perspective view which shows the construction procedure (the 9) of the underground structure 1.

符号の説明Explanation of symbols

１…地下構造物、２〜５…鋼殻エレメント、６…推力伝達部材、７…雌継手、８…雄継手、１０…掘削装置、１１…元押しジャッキ、１７…ガイド鋼管   DESCRIPTION OF SYMBOLS 1 ... Underground structure, 2-5 ... Steel shell element, 6 ... Thrust transmission member, 7 ... Female joint, 8 ... Male joint, 10 ... Excavator, 11 ... Main jack, 17 ... Guide steel pipe

Claims (7)

発進側に元押しジャッキを設置し、角形断面の鋼殻エレメントを順次、貫入済みの鋼殻エレメントと連結させながら貫入する手順を繰り返し、前記鋼殻エレメントにより地下構造物を構築する鋼殻エレメントの構築方法において、
先行して貫入させた鋼殻エレメントの１側面に所定長さの推力伝達部材が縦列的に付設されている状態から、この貫入済みの鋼殻エレメントに付設された推力伝達部材と隣接する側において、掘削装置を貫入済みの鋼殻エレメントに付設された推力伝達部材と連結した後、順次所定長さの鋼殻エレメントを後続させるとともに、貫入済みの鋼殻エレメントと連結させた状態とし、かつ前記貫入済みの鋼殻エレメントに付設された推力伝達部材に順次所定長さの推力伝達部材を後続させるとともに、貫入させる鋼殻エレメントの１側面に順次所定長さの推力伝達部材を付設しながら、これら２箇所に配置された推力伝達部材を前記元押しジャッキによって押込み、鋼殻エレメントを間接的に牽引しながら貫入させる手順を順次繰り返すことを特徴とする鋼殻エレメントの構築方法。 Install the main jack on the starting side, repeat the procedure of inserting the steel shell element with a square cross section in sequence with the steel shell element that has already been penetrated, and build the underground structure with the steel shell element. In the construction method,
From a state in which a thrust transmission member having a predetermined length is vertically attached to one side surface of the steel shell element that has been penetrated in advance, on the side adjacent to the thrust transmission member attached to the steel shell element that has already been penetrated , After connecting the drilling device with the thrust transmission member attached to the penetrated steel shell element, sequentially followed by the steel shell element of a predetermined length, and connected to the penetrated steel shell element, and The thrust transmission member attached to the penetrated steel shell element is sequentially followed by a thrust transmission member having a predetermined length, and the thrust transmission member having a predetermined length is sequentially attached to one side surface of the steel shell element to be penetrated. The thrust transmission members arranged at two locations are pushed in by the former push jack, and the procedure of inserting the steel shell element while indirectly pulling it is repeated. How to build a steel shell elements to be. 前記鋼殻エレメントを断面視で矩形状に閉合させて地下構造物を構築する請求項１記載の鋼殻エレメントの構築方法。   The construction method of a steel shell element according to claim 1, wherein the steel shell element is closed in a rectangular shape in a cross-sectional view to construct an underground structure. 発進側に元押しジャッキを設置し、角形断面の鋼殻エレメントを順次、貫入済みの鋼殻エレメントと連結させながら貫入する手順を繰り返し、前記鋼殻エレメントにより地下構造物を構築する鋼殻エレメントの構築方法において、
最初に貫入させる鋼殻エレメントの施工は、先端の掘削装置に、順次所定長さの鋼殻エレメントを後続させるとともに、鋼殻エレメントの２側面に順次所定長さの推力伝達部材を付設しながら、前記対の推力伝達部材を前記元押しジャッキによって押込んで鋼殻エレメントを貫入させ、
次順以降に貫入させる鋼殻エレメントの施工は、貫入済みの鋼殻エレメントに付設された推力伝達部材と隣接する側とし、掘削装置を貫入済みの鋼殻エレメントに付設された推力伝達部材と連結した後、順次所定長さの鋼殻エレメントを後続させるとともに、貫入済みの鋼殻エレメントと連結させた状態とし、かつ前記貫入済みの鋼殻エレメントに付設された推力伝達部材に順次所定長さの推力伝達部材を後続させるとともに、貫入させる鋼殻エレメントの１側面に順次所定長さの推力伝達部材を付設しながら、これら２箇所に配置された推力伝達部材を前記元押しジャッキによって押込み、鋼殻エレメントを間接的に牽引しながら貫入させる手順を順次繰り返すことを特徴とする鋼殻エレメントの構築方法。 Install the main jack on the starting side, repeat the procedure of inserting the steel shell element with a square cross section in sequence with the steel shell element that has already been penetrated, and build the underground structure with the steel shell element. In the construction method,
The construction of the steel shell element to be penetrated first is made by sequentially following the steel shell element of a predetermined length to the excavator at the tip, and sequentially attaching a thrust transmission member of a predetermined length on the two side surfaces of the steel shell element, The pair of thrust transmission members are pushed in by the former push jack to penetrate the steel shell element,
The construction of the steel shell element to be penetrated from the next order is on the side adjacent to the thrust transmission member attached to the penetrated steel shell element, and the excavator is connected to the thrust transmission member attached to the penetrated steel shell element. After that, the steel shell element having a predetermined length is sequentially followed, and is connected to the penetrated steel shell element, and the thrust transmission member attached to the penetrated steel shell element is sequentially provided to the thrust transmission member. While the thrust transmission member is made to follow and a thrust transmission member having a predetermined length is sequentially attached to one side of the steel shell element to be penetrated, the thrust transmission members arranged at these two locations are pushed in by the main push jack, A method for constructing a steel shell element characterized by sequentially repeating the procedure of intrusion while indirectly pulling the element. 前記鋼殻エレメントを断面視で矩形状に閉合させて地下構造物を構築する請求項３記載の鋼殻エレメントの構築方法。   The method for constructing a steel shell element according to claim 3, wherein the steel shell element is closed in a rectangular shape in a sectional view to construct an underground structure. 前記最初に貫入させる鋼殻エレメントの施工前に、予め小口径推進機によりガイド鋼管を設置しておき、このガイド鋼管を前記掘削装置の先端に連結し、ガイド鋼管を押出しながら鋼殻エレメントの貫入を行うようにする請求項３、４いずれかに記載の鋼殻エレメントの構築方法。   Prior to the construction of the first steel shell element to be penetrated, a guide steel pipe is installed in advance by a small-diameter propulsion machine, this guide steel pipe is connected to the tip of the excavator, and the steel shell element is penetrated while the guide steel pipe is extruded. The method for constructing a steel shell element according to any one of claims 3 and 4. 前記鋼殻エレメントの単位長さと、前記推力伝達部材の単位長さとを同じとしてある請求項１〜５いずれかに記載の鋼殻エレメントの構築方法。   The method for constructing a steel shell element according to any one of claims 1 to 5, wherein a unit length of the steel shell element is the same as a unit length of the thrust transmission member. 多数の鋼殻エレメントを矩形状に閉合させた矩形断面の内、上端隅角部の鋼殻エレメントを最初に貫入させ、次いで水平方向に沿って順次鋼殻エレメントを貫入させて上床版となる部分を構築した後、上床版の両端部に位置する鋼殻エレメントから下側方向に向かって順次鋼殻エレメントを貫入させて側壁を構築し、次いで下端隅角部の鋼殻エレメントから順次水平方向に沿って順次鋼殻エレメントを貫入させて下床版となる部分を構築する手順によって、多数の鋼殻エレメントを断面視で矩形状に閉合させる請求項３、４いずれかに記載の鋼殻エレメントの構築方法。   Of the rectangular cross section in which many steel shell elements are closed in a rectangular shape, the steel shell element at the top corner is first penetrated, and then the steel shell elements are sequentially penetrated along the horizontal direction to form the upper floor slab After building the side walls, the steel shell elements located at both ends of the upper floor slab are sequentially penetrated from the steel shell elements in the downward direction to construct the side walls, and then the steel shell elements at the bottom corners are sequentially arranged in the horizontal direction. The steel shell element according to any one of claims 3 and 4, wherein a number of steel shell elements are closed in a rectangular shape in a cross-sectional view by a procedure for constructing a portion that becomes a lower floor slab by sequentially intruding the steel shell elements along the cross section. Construction method.
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Publication number Priority date Publication date Assignee Title
CN108150205A (en) * 2017-12-31 2018-06-12 中铁隧道集团二处有限公司 The method that pipe jacking tunnel constructs underground parking

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108150205A (en) * 2017-12-31 2018-06-12 中铁隧道集团二处有限公司 The method that pipe jacking tunnel constructs underground parking

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