JP5021526B2 - Construction method of underpass and connecting structure of superstructure girder and underground wall - Google Patents

Construction method of underpass and connecting structure of superstructure girder and underground wall Download PDF

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JP5021526B2
JP5021526B2 JP2008050270A JP2008050270A JP5021526B2 JP 5021526 B2 JP5021526 B2 JP 5021526B2 JP 2008050270 A JP2008050270 A JP 2008050270A JP 2008050270 A JP2008050270 A JP 2008050270A JP 5021526 B2 JP5021526 B2 JP 5021526B2
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girder
underpass
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将博 中井
義彦 西垣
文彦 横山
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株式会社ピーエス三菱
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Description

本発明は、アンダーパスの造成方法及びこの方法に用いる上部工桁と地中壁との結合構造に関する。   The present invention relates to a method for creating an underpass and a connection structure between an upper work girder and an underground wall used in this method.

道路の平面交差構造を改良して立体交差にするアンダーパス造成方法がある（例えば、特許文献１参照。）。   There is an underpass creation method for improving a planar intersection structure of a road to form a three-dimensional intersection (see, for example, Patent Document 1).

この方法では、Ｈ型断面を有するプレテンション方式のプレストレストコンクリート杭（Ｈ型ＰＣ杭）をアンダーパスの両側面を形成する部分に連接して打込んで一双の連続地中壁を構築し、この地中壁内の地盤を掘削してアンダーパスを施工する。短工期に安全に高能率施工することが可能であり、交通遮断期間を短縮するなど、すぐれた効果を奏する。この技術では、アンダーパスを形成する地盤を掘下げる際に、一双の地中壁間に切梁を施して地中壁の倒れを防止していた。
特許第３８９６３５１号公報 In this method, a pre-tensioned prestressed concrete pile (H-type PC pile) with an H-shaped cross section is driven into the part that forms both side surfaces of the underpass to construct a pair of continuous underground walls. Underpass is constructed by excavating the ground in the underground wall. It is possible to perform high-efficiency construction safely in a short construction period, and it has excellent effects such as shortening the traffic interruption period. With this technology, when digging the ground forming the underpass, a slab was placed between the pair of underground walls to prevent the underground wall from falling down.
Japanese Patent No. 3896351

本発明は上記アンダーパス造成方法にさらに改善を加え、上部工桁の架設及び上部工桁と地中壁との結合構造に工夫を加えることによって、さらに合理的なアンダーパスの造成方法を確立し、その方法及び上部工桁と地中壁との結合構造を提供することを目的とするものである。   The present invention further improves the above-described underpass creation method, and establishes a more rational underpass creation method by adding a device to the construction of the upper work girder and the connection structure of the upper work girder and the underground wall. It is an object of the present invention to provide a method and a coupling structure between an upper work girder and an underground wall.

本発明は上記目的を達成するためになされたもので、アンダーパスを形成すべき地盤のアンダーパス両壁部に一双の地中壁を形成し、該一双の地中壁間の土砂を一定深さまで掘削して桁仮支持支保工載置地盤面を造成し、頂部が前記地中壁頂部より少し高い桁仮支持支保工を該地盤面上に載置し、該仮支持支保工上にアンダーパスの上部工桁を並べて載置し、隣接する上部工桁間の空所に間詰めコンクリートを充填した後、該上部工桁を横締めし、次いで、前記地中壁の頂端と前記上部工桁との結合部に鉄筋を配置し、該結合部を覆う型枠を取付けて結合部コンクリートを打設した後、前記上部工桁端部を横締めし、コンクリート硬化後前記桁仮支持支保工を撤去し、前記上部工桁を前記地中壁の間隔を保持する切梁として用い、前記地中壁間の地盤を掘下げ、アンダーパスを形成することを特徴とするアンダーパスの造成方法である。   The present invention has been made to achieve the above-mentioned object, and forms a pair of underground walls on both walls of the underpass of the ground where the underpass is to be formed, and the soil between the pair of underground walls is fixed to a certain depth. The girder temporary support support mounting ground surface is excavated to the depth, and the girder temporary support support is placed on the ground surface with the top part slightly higher than the top of the underground wall, and an underpass is placed on the temporary support support structure. The upper work girders are placed side by side, and the space between the adjacent upper work girders is filled with the compacted concrete, then the upper work girders are laterally tightened, and then the top end of the underground wall and the upper work girder After placing the rebar in the joint part, attaching the formwork covering the joint part and placing the joint part concrete, the end of the upper work girder is laterally tightened, and after the concrete is hardened, the temporary support support work for the girder is performed. Remove and use the upper work girder as a cutting beam to maintain the space between the underground walls, Of dug the ground, a reclamation method underpass, which comprises forming a underpass.

本発明は、アンダーパスの造成に当り、上部工桁（ＰＣａＰＣ桁又はＰＣａＲＣ桁）と土留め擁壁をなす地中壁（場所打ち施工のもの又はＨ型ＰＣ杭を打込んで形成したもの）とを剛結合として結合することを特徴とする。前記一双の地中壁は場所打ち施工の地中壁であってもよいが、Ｈ型ＰＣ杭を連接して地中に打込んで形成した地中壁である場合に一層好適であり、また前記上部工桁がＰＣ桁であると好ましい。   In the present invention, when creating the underpass, the underground wall (the one made by cast-in-place or the H-type PC pile) that forms the upper retaining girder (PCaPC girder or PCaRC girder) and the retaining wall Are combined as a rigid connection. The pair of underground walls may be cast-in-place underground walls, but is more suitable when it is an underground wall formed by connecting H-shaped PC piles into the ground, The upper work girder is preferably a PC girder.

上部工桁と地中壁頂部との結合は、先に地中壁を設け、次にプレキャスト上部工桁を地中壁より上方に仮支持設置して行う。このとき、プレキャストコンクリート上部工桁と地中壁は直接接しておらず、両者が空中に離れた位置関係にある。この空間に両者を結合する鉄筋を配筋し、両者の端部を包み込むように結合コンクリートを打設することによって両者を一体化し、剛結合構造とする。   The connection between the upper work girder and the top of the underground wall is performed by first providing the underground wall and then temporarily supporting and installing the precast upper work beam above the underground wall. At this time, the precast concrete superstructure girder and the underground wall are not in direct contact with each other, and they are in a positional relationship apart from each other in the air. Reinforcing the reinforcing bars that connect the two in this space, and placing the connecting concrete so as to wrap the ends of the two, they are integrated into a rigid connection structure.

上記本発明方法を適切に実施するための本発明の上部工桁と地中壁との結合構造は、アンダーパスを形成すべき一双の地中壁の上端と該壁体上に載設する上部工桁の端部とを結合する結合部において、前記地中壁はＨ型ＰＣ杭を地中に連接して打込んでなる地中壁とし、前記上部工桁の端部から突出した鉄筋と連結され前記壁体の背面から前記地中壁の腹腔内に達する連結鉄筋を備え、前記上部工桁の端部の横締め緊張部を内蔵し、前記地中壁上端と前記上部工桁端とを被覆して両者を剛結する鉄筋コンクリートからなることを特徴とするアンダーパス造成における上部工桁と地中壁との結合構造である。   In order to appropriately carry out the above-described method of the present invention, the upper girder and underground wall connection structure of the present invention includes an upper end of a pair of underground walls to form an underpass and an upper portion mounted on the wall body. In the joint portion that joins the end of the work girder, the underground wall is an underground wall formed by connecting and driving an H-shaped PC pile into the ground, and a reinforcing bar protruding from the end of the upper work girder A connecting reinforcing bar that is connected and reaches the abdominal cavity of the underground wall from the back surface of the wall body, and includes a lateral tightening tension portion at the end of the upper work girder, and the upper end of the underground wall and the upper work beam end; It is a joint structure between the superstructure girder and the underground wall in underpass construction, characterized by comprising reinforced concrete that covers and rigidly bonds the two.

本発明によれば、上部工桁を地中壁頂部と剛結合してアンダーパスの横断部オーバーパスを先に使用開始することができ、交通遮断期間を短縮することができる。その後、アンダーパス地盤を掘削するが、このとき上部工桁を地中壁間の切梁として利用することができ、別途に切梁を設けることが不要となる。また、上部工桁が地中壁上端間を支持するので、地中壁の土圧による曲げモーメントを減少させる。従って、地中壁の部材の小型化を図ることができ、設計が容易となる。   According to the present invention, the upper work girder can be rigidly connected to the top of the underground wall, and the use of the underpass crossing overpass can be started first, and the traffic blocking period can be shortened. Thereafter, the underpass ground is excavated. At this time, the upper work girder can be used as a beam between the underground walls, and it is not necessary to provide a separate beam. Moreover, since the upper work girder supports between the upper ends of the underground walls, the bending moment due to the earth pressure of the underground walls is reduced. Therefore, it is possible to reduce the size of the underground wall member and to facilitate the design.

本発明による上部工桁と地中壁頂端との結合構造は剛結合方式になるため、上部工桁の伸縮を吸収するための伸縮装置及び沓座が不要となり、メンテナンスフリーとなる。また、結合部は遮水性に優れる。さらに土留壁に生じる土圧の一部を上部工桁が切り梁として負担する。   Since the coupling structure of the upper work girder and the top end of the underground wall according to the present invention is a rigid coupling system, a telescopic device and a saddle for absorbing the expansion and contraction of the upper work girder are unnecessary, and maintenance is free. Further, the joint portion is excellent in water shielding. In addition, the upper work girder bears part of the earth pressure generated on the retaining wall as a cutting beam.

本発明では、活荷重の影響が大きい上部工桁に高強度・高品質なＰＣ部材を使用することができ、疲労に対しても高耐久化を図ることができると共に、上部工桁同士を横締め緊張して連結するため、活荷重が上部工桁全体に分配され、上部工桁１本当たりの負担が小さくなる。   In the present invention, a high-strength and high-quality PC member can be used for an upper work girder that is greatly affected by a live load, and it is possible to improve durability against fatigue and Since the connection is made by tightening and tensioning, the live load is distributed to the entire upper girder, and the burden per upper girder is reduced.

本発明によれば地中壁の破壊位置を地表近くに特定することができ、結合部は鉄筋コンクリート構造なので、塑性ヒンジを発生させ、脆性的な破壊を防ぐことができる。地震等の被災後の修復、あるいは危険予知に対しても効果的である。   According to the present invention, the fracture position of the underground wall can be specified near the ground surface, and since the joint portion is a reinforced concrete structure, a plastic hinge can be generated to prevent brittle fracture. It is also effective for restoration after earthquakes and other disasters or foreseeing danger.

以下、図面を参照して本発明の実施の形態を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は本発明の実施例を示すもので、地中壁１０と上部工桁３０との結合構造を示す模式縦断面図である。地中壁１０はＨ型ＰＣ杭を地中に連接して打込んで形成したものである。上部工桁３０は桁端部から鉄筋３３を突出したＰＣ桁である。   FIG. 1 shows an embodiment of the present invention, and is a schematic longitudinal sectional view showing a connection structure between an underground wall 10 and an upper work girder 30. The underground wall 10 is formed by connecting and driving H-shaped PC piles into the ground. The upper work girder 30 is a PC girder in which a reinforcing bar 33 protrudes from the end of the girder.

地中壁１０と上部工桁３０との結合部４０は、これらの鉄筋３３と力学的に結合され、地中壁１０のＨ型ＰＣ杭１１の内腔部１２内まで延長して内腔部１２にコンクリート充填により固着された補強鉄筋３４が設けられている。鉄筋３４は地中壁１０の頂部と上部工桁３０の端部とを剛結するもので、これら及び上部工桁３０の端部の横締め部３８を内蔵して打設されたコンクリート３６によって一体化されている。   The joint portion 40 between the underground wall 10 and the upper work girder 30 is mechanically connected to these reinforcing bars 33 and extends into the inner cavity portion 12 of the H-shaped PC pile 11 of the underground wall 10. Reinforcing bar 34 fixed to concrete 12 by concrete filling is provided. Reinforcing bars 34 rigidly connect the top of the underground wall 10 and the end of the upper work girder 30, and these and the concrete 36 that is placed and embedded with a lateral fastening portion 38 at the end of the upper work girder 30. It is integrated.

次に、本発明のアンダーパスの造成方法について説明する。   Next, the underpass creation method of the present invention will be described.

図２は、Ｈ型ＰＣ杭１１を地盤１００中に圧入完了して、地中壁１０を形成した工程を示す地中壁１０の縦断面図である。この地中壁１０は左右一双となっており、その間にアンダーパスを形成するのであるが、図２は一方の地中壁のみ示している。以下図９まで同様である。   FIG. 2 is a longitudinal sectional view of the underground wall 10 showing a process of forming the underground wall 10 by press-fitting the H-shaped PC pile 11 into the ground 100. The underground wall 10 is a pair of left and right, and an underpass is formed between them, but FIG. 2 shows only one underground wall. The same applies to FIG.

次いで、図３に示すように、地盤１００を掘削し、地盤面１０１を形成する。地盤面１０１は例えば砕石を敷詰めて圧密し、その上に敷鉄板を敷設して正確で強固な地盤面１０１とする。図３は地盤面１０１上に桁仮支持支保工２０を載置した工程を示している。   Next, as shown in FIG. 3, the ground 100 is excavated to form a ground surface 101. For example, the ground surface 101 is laid with crushed stone and consolidated, and a laid iron plate is laid on the ground surface 101 to obtain an accurate and strong ground surface 101. FIG. 3 shows a process of placing the girder temporary support support 20 on the ground surface 101.

桁仮支持支保工２０は、Ｈ型鋼の下駄２１及び上面桁受部２２を備え、その頂面高さは地中壁１０の頂端より一定寸法だけ高くする。   The girder temporary support support 20 includes an H-shaped steel clog 21 and an upper girder receiving portion 22, and the top surface height is higher than the top end of the underground wall 10 by a certain dimension.

図４は桁仮支持支保工２０上に上部工桁３０を載置した状態を示している。上部工桁３０はプレキャストプレストレストコンクリート製又はプレキャスト鉄筋（又は鉄骨鉄筋）コンクリート製、鋼製など何れでもよい。図４はＰＣａＰＣ桁を示している。隣接する上部工桁の間に間詰めコンクリート３１を打設し、横締め部３２を緊張して隣接桁の一体化を図る。このとき、上部工桁３０の端部の横締め部３８はそのままとしておく。   FIG. 4 shows a state where the upper work girder 30 is placed on the temporary girder support support 20. The upper work girder 30 may be made of precast prestressed concrete, precast reinforcing steel (or steel-reinforced steel) concrete, steel, or the like. FIG. 4 shows PCaPC digits. The interstitial concrete 31 is placed between adjacent upper work girders, and the lateral fastening portions 32 are tensioned to integrate the adjacent girders. At this time, the lateral fastening portion 38 at the end of the upper work beam 30 is left as it is.

図５は、結合部鉄筋３４を、上部工桁３０内から突出している鉄筋３３と力学的に結合させて配筋し、その外側に配筋を覆う型枠３５を取付けた状態を示している。結合部鉄筋３４は、上部工桁３０の鉄筋３３と重ね接ぎ、金物接ぎ、結束、その他通常用いられる鉄筋結束手段を用いて、上部工桁３０と地中壁１０とを力学的に結合する。地中壁１０は例えばＨ型ＰＣ杭を用いて形成されたものであれば、鉄筋３４をその腹腔内に進入させ、この腹腔内にコンクリートを充填すること等により結合させるとよい。   FIG. 5 shows a state in which the connecting portion reinforcing bar 34 is mechanically connected to the reinforcing bar 33 protruding from the upper work girder 30 and the formwork 35 covering the reinforcing bar is attached to the outside. . The connecting portion reinforcing bar 34 mechanically connects the upper work girder 30 and the underground wall 10 by using the reinforcing bar binding means of the upper work girder 30 by overlapping, metal fitting, bundling, and other commonly used reinforcing bar binding means. If the underground wall 10 is formed using, for example, an H-shaped PC pile, the reinforcing bar 34 may be inserted into the abdominal cavity, and the abdominal cavity may be filled with concrete or the like.

図６は型枠３５内にコンクリート３６を打設した状態を示している。また、図７は上部工桁３０の端部を斜め上から見た斜視図である。コンクリート３６が型枠３５内に密実に充填されるように、上部工桁３０の端部にはコンクリートを型枠内に充満するように、例えば誘導する孔や、図７に示すような大きな隙間３０ａ等を設けておくのがよい。特にハンチ部３７等に欠陥を生じないようにすることが好ましい。   FIG. 6 shows a state in which concrete 36 is placed in the mold 35. FIG. 7 is a perspective view of the end portion of the upper work girder 30 as viewed obliquely from above. For example, in order to fill concrete into the formwork 35, the end of the upper work girder 30 is filled with concrete in the formwork. For example, a guide hole or a large gap as shown in FIG. 30a or the like is preferably provided. In particular, it is preferable not to cause a defect in the haunch portion 37 or the like.

図８は、コンクリート３６が硬化した後、上部工桁３０の端部の横締め部３８を横締めする工程を示している。上部工桁３０と地中壁１０とは剛構造で結合される。コンクリート３６の養生後、桁仮支持支保工２０をジャッキダウンし撤去する。   FIG. 8 shows a step of laterally fastening the lateral fastening portion 38 at the end of the upper work beam 30 after the concrete 36 is hardened. The upper work girder 30 and the underground wall 10 are connected with a rigid structure. After curing the concrete 36, the girder temporary support support 20 is jacked down and removed.

次いで図９に示すように地中壁の背面の掘削部１０２を埋戻す。   Next, as shown in FIG. 9, the excavation part 102 on the back surface of the underground wall is backfilled.

以下、上部工桁３０を切梁として地盤１００を、矢印１０３で示す方向に掘削して地盤面１０４を掘下げ、所望のアンダーパスを形成する。   Hereinafter, the ground 100 is excavated in the direction indicated by the arrow 103 by using the upper work girder 30 as a cutting beam, and the ground surface 104 is dug down to form a desired underpass.

実施例の結合構造を示す斜視図である。It is a perspective view which shows the coupling structure of an Example. 実施例のアンダーパス造成工程を示す説明図である。It is explanatory drawing which shows the underpass creation process of an Example. 実施例のアンダーパス造成工程を示す説明図である。It is explanatory drawing which shows the underpass creation process of an Example. 実施例のアンダーパス造成工程を示す説明図である。It is explanatory drawing which shows the underpass creation process of an Example. 実施例のアンダーパス造成工程を示す説明図である。It is explanatory drawing which shows the underpass creation process of an Example. 実施例のアンダーパス造成工程を示す説明図である。It is explanatory drawing which shows the underpass creation process of an Example. 上部工桁の端部を斜め上から見た斜視図である。It is the perspective view which looked at the edge part of the upper work beam from diagonally upward. 実施例のアンダーパス造成工程を示す説明図である。It is explanatory drawing which shows the underpass creation process of an Example. 実施例のアンダーパス造成工程を示す説明図である。It is explanatory drawing which shows the underpass creation process of an Example.

符号の説明Explanation of symbols

１０ 地中壁
１１ Ｈ型ＰＣ杭
１２ 内腔部
２０ 桁仮支持支保工
２１ 下駄
２２ 上面桁受部
３０ 上部工桁
３０ａ 隙間
３１ 間詰めコンクリート
３２ 横締め部
３３ 接続用鉄筋
３４ 結合部鉄筋
３５ 型枠
３６ コンクリート
３７ ハンチ部
３８ 横締め部
４０ 地中壁と上部工桁との結合部
１００ 地盤
１０１，１０４ 地盤面
１０２ 掘削部
１０３ 矢印 DESCRIPTION OF SYMBOLS 10 Underground wall 11 H type PC pile 12 Lumen part 20 Girder temporary support support 21 Clogs 22 Upper girder receiving part 30 Upper work girder 30a Gap 31 Filled concrete 32 Lateral fastening part 33 Reinforcing bar 34 Connection part rebar 35 type Frame 36 Concrete 37 Haunch part 38 Lateral fastening part 40 Joint part of underground wall and superstructure girder 100 Ground 101, 104 Ground surface 102 Excavation part 103 Arrow

Claims (4)

アンダーパスを形成すべき地盤のアンダーパス両壁部に一双の地中壁を形成し、該一双の地中壁間の土砂を一定深さまで掘削して桁仮支持支保工載置地盤面を造成し、頂部が前記地中壁頂部より少し高い桁仮支持支保工を該地盤面上に載置し、該仮支持支保工上にアンダーパスの上部工桁を並べて載置し、隣接する上部工桁間の空所に間詰めコンクリートを充填した後、該上部工桁を横締めし、次いで、前記地中壁の頂端と前記上部工桁との結合部に鉄筋を配置し、該結合部を覆う型枠を取付けて結合部コンクリートを打設した後、前記上部工桁端部を横締めし、コンクリート硬化後前記桁仮支持支保工を撤去し、前記上部工桁を前記地中壁の間隔を保持する切梁として用い、前記地中壁間の地盤を掘下げ、アンダーパスを形成することを特徴とするアンダーパスの造成方法。   A pair of underground walls are formed on both underpass walls of the ground where an underpass should be formed, and the ground between the pair of underground walls is excavated to a certain depth to create a ground support support mounting ground surface. A temporary support supporting girder whose top is slightly higher than the top of the underground wall is placed on the ground surface, and an underpass upper girder is placed side by side on the temporary supporting support, After filling the empty space between the gaps, the upper work girder is laterally tightened, and then a reinforcing bar is arranged at the joint between the top end of the underground wall and the upper work girder to cover the joint After attaching the formwork and placing the joint concrete, the end of the upper work girder is laterally tightened, the concrete temporary support support is removed after the concrete is hardened, and the upper work girder is spaced apart from the underground wall. It is used as a holding beam to dig down the ground between the underground walls and form an underpass. Construction method of underpass to. 前記一双の地中壁がＨ型ＰＣ杭を連接して地中に打込んで形成した地中壁であることを特徴とする請求項１記載のアンダーパスの造成方法。   2. The underpass creation method according to claim 1, wherein the pair of underground walls are underground walls formed by connecting H-shaped PC piles and driving them into the ground. 前記上部工桁がＰＣ桁であることを特徴とする請求項１又は２記載のアンダーパスの造成方法。   The underpass creation method according to claim 1 or 2, wherein the upper work girder is a PC girder. アンダーパスを形成すべき一双の地中壁の上端と該壁体上に載設する上部工桁の端部とを結合する結合部において、前記地中壁はＨ型ＰＣ杭を地中に連接して打込んでなる地中壁とし、前記上部工桁の端部から突出した鉄筋と連結され前記壁体の背面から前記地中壁の腹腔内に達する連結鉄筋を備え、前記上部工桁の端部の横締め緊張部を内蔵し、前記地中壁上端と前記上部工桁端とを被覆して両者を剛結する鉄筋コンクリートからなることを特徴とするアンダーパス造成における上部工桁と地中壁との結合構造。   In the joint that connects the upper end of a pair of underground walls to form an underpass and the end of the upper work girder placed on the wall body, the underground wall connects the H-type PC pile to the ground And a connecting rebar that is connected to a reinforcing bar that protrudes from an end of the upper work girder and reaches the abdominal cavity of the underground wall from the back of the wall body, The upper work girder and the underground in underpass construction characterized by comprising reinforced concrete that has a built-in laterally tightened tension part, covers the upper end of the underground wall and the end of the upper work girder, and rigidly bonds both. Bonding structure with wall.
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