JP5335602B2 - Construction girder support method and construction girder support structure for under-track structure construction - Google Patents

Construction girder support method and construction girder support structure for under-track structure construction Download PDF

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JP5335602B2
JP5335602B2 JP2009178666A JP2009178666A JP5335602B2 JP 5335602 B2 JP5335602 B2 JP 5335602B2 JP 2009178666 A JP2009178666 A JP 2009178666A JP 2009178666 A JP2009178666 A JP 2009178666A JP 5335602 B2 JP5335602 B2 JP 5335602B2
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construction
support
roadbed
steel plate
girder
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JP2011032693A (en
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忠良 石橋
智明 森山
秀之 小泉
公孝 西村
志朗 伊東
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JR East Consultants Co
East Japan Railway Co
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East Japan Railway Co
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Description

本発明は、線路下構造物を開削工法で構築する際レールを支持する工事桁支持方法および工事桁支持構造に関する。   The present invention relates to a construction girder support method and a construction girder support structure for supporting a rail when a structure under a track is constructed by an open-cut method.

線路下構造物構築の工法として、開削工法、非開削工法がある。開削工法においては、工事桁でレールを支持する方法が採られる。   There are open-cut method and non-open-cut method as methods for constructing structures under the track. In the open-cut method, a method of supporting the rail with a construction girder is adopted.

工事桁を支持する形式として、図１８に示されるように、支持層１４まで達する支持杭１２を打設して工事桁１１を支持するものがある。支持杭１２で支持された工事桁１１でレール４を支持した状態で、路盤１を水平支持部材で支持された土留め壁１３で保持しながら開削し、工事杭１５で工事桁１１の中間部を支持しつつ線路下構造物を構築する。   As shown in FIG. 18, there is a type of supporting the construction girder 11 by placing a support pile 12 that reaches the support layer 14 as a form for supporting the construction girder. While the rail 4 is supported by the work girder 11 supported by the support pile 12, excavation is performed while holding the roadbed 1 by the retaining wall 13 supported by the horizontal support member, and the middle part of the work girder 11 by the work pile 15 The structure under the track is constructed while supporting

また、図１９に示されるように、バラスト下の路盤１を地盤改良６して支持力を向上させ、その上に直接基礎７を設置して工事桁１１を支持するものがある。直接基礎７で支持された工事桁１１でレール４を支持した状態で、路盤１を水平支持部材で支持された土留め壁１３で保持しながら開削し、工事杭１５で工事桁１１の中間部を支持しつつ線路下構造物を構築する。   In addition, as shown in FIG. 19, there is a type that supports the construction girder 11 by directly installing the foundation 7 on the ground improvement 6 of the roadbed 1 under the ballast to improve the supporting force and directly installing the foundation 7 thereon. With the rail 4 supported by the construction girder 11 directly supported by the foundation 7, the roadbed 1 is excavated while being held by the retaining wall 13 supported by the horizontal support member, and the middle portion of the construction girder 11 by the construction pile 15 The structure under the track is constructed while supporting

特開２００９−１４４３４６号公報JP 2009-144346 A 特開２００６−３７４１３号公報JP 2006-37413 A

しかしながら、線路下構造物を開削工法で構築する際のレール４を支持する工事桁１１の支持形式としての支持杭１２は、支持層１４まで支持杭１２を打設しなければならず、杭打設のための施工時間が長いという問題がある。また、地盤改良６等の路盤強化を実施し、その上にコンクリートブロック等の直接基礎７で工事桁１１を支持する形式では、地盤改良６等の大掛かりな施工が必要であり、施工時間が長いという問題がある。このように従来の工事桁１１の支持形式は長時間の作業を必要とし、終電〜初電までの間に工事が終了せず、列車の一部運休という問題が発生し、鉄道利用者に迷惑をかけるだけでなく、運賃収入にも影響し、結果として高コストの施工工事となるという問題も発生する。   However, the support pile 12 as the support form of the work girder 11 that supports the rail 4 when the under-track structure is constructed by the open-cut method must be driven up to the support layer 14. There is a problem that the construction time for installation is long. In addition, in the form in which the ground improvement such as the ground improvement 6 is carried out and the construction girder 11 is supported by the direct foundation 7 such as the concrete block, a large construction such as the ground improvement 6 is required and the construction time is long. There is a problem. As described above, the conventional support form of the construction girder 11 requires a long work, and the construction is not completed between the last train and the first train, and there is a problem that a part of the train is suspended. In addition to costing, it also affects fare revenue, resulting in high cost construction work.

本発明は、上記課題を解決する、工事桁の支持形式、施工方法を見直し、施工性を向上させ、施工時間を短縮した線路下構造物を開削工法で構築する際使用する線路下構造物構築用工事桁支持方法および工事桁支持構造を提供することを目的とする。   The present invention solves the above-mentioned problems, reviews the construction form support method and construction method, improves the workability, and constructs the structure under the track that is used when constructing the structure under the track with a shortened construction time by the open-cut method. The purpose is to provide a construction girder support method and construction girder support structure.

本発明の線路下構造物構築用工事桁支持方法は、前記課題を解決するために、線路下構造物構築部に対応するレール、枕木及びバラストを撤去し路盤を露出させる工程と、下部に鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部を複数設置した工事桁を仮支持部材を介して前記路盤上に設置する工程と、前記路盤と前記支承部との間の不陸を調整して前記支承部を前記路盤上に支持する工程と、前記工事桁上のレールと隣接するレールとを連続するように取り付ける工程と、を有することを特徴とする。   In order to solve the above-mentioned problem, the construction girder support method for constructing a structure under the track of the present invention includes a step of removing rails, sleepers and ballasts corresponding to the structure under the track structure and exposing the roadbed, and a steel plate at the bottom. A step of installing a work girder in which a plurality of support portions, each of which is a laminate of a base steel plate having a larger area than the steel plate support, are installed on the roadbed via a temporary support member; and the unevenness between the roadbed and the support portion. And the step of supporting the support portion on the roadbed and the step of attaching the rail on the construction girder and the adjacent rail in a continuous manner.

また、本発明の線路下構造物構築用工事桁支持方法は、前記路盤と前記基礎鋼板との間の不陸を調整する工程を前記路盤上に配置したグラウト注入バックへのグラウト注入により実施することを特徴とする。   Further, in the construction girder support method for constructing a structure under the track of the present invention, the step of adjusting the unevenness between the roadbed and the foundation steel plate is performed by grout injection to a grout injection back disposed on the roadbed. It is characterized by that.

また、本発明の線路下構造物構築用工事桁支持方法は、前記路盤と前記基礎鋼板との間の不陸を調整する工程を前記路盤と前記基礎鋼板との間への固化剤流し込みにより実施することを特徴とする。   Further, in the construction girder support method for constructing a structure under a track of the present invention, the step of adjusting the unevenness between the roadbed and the foundation steel plate is performed by pouring a solidifying agent between the roadbed and the foundation steel plate. It is characterized by doing.

また、本発明の線路下構造物構築用工事桁支持構造は、線路下構造物構築部に対応するレールを支持する工事桁において、前記工事桁の下部に鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部を複数有し、前記複数の支承部を有する工事桁をレール、枕木及びバラストを撤去した路盤上に不陸調整して直接設置することを特徴とする。   Further, the construction girder support structure for constructing the under-line structure according to the present invention is a construction girder for supporting the rail corresponding to the under-structure construction part, and has a steel plate support and a larger area than the steel plate support at the lower part of the construction girder. It has a plurality of support parts laminated with basic steel plates, and the construction girder having the plurality of support parts is directly installed on the roadbed from which rails, sleepers and ballasts have been removed and adjusted directly.

線路下構造物構築部に対応するレール、枕木及びバラストを撤去し路盤を露出させる工程と、下部に鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部を複数設置した工事桁を仮支持部材を介して前記路盤上に設置する工程と、前記路盤と前記支承部との間の不陸を調整して前記支承部を前記路盤上に支持する工程と、前記工事桁上のレールと隣接するレールとを連続するように取り付ける工程と、を有する構成により、長年バラスト軌道で受けた履歴荷重により締め固められ支持力の大きい路盤を工事桁の支持体とすることにより施工時間を短縮でき施工コストを低減することが可能となる。また、工事桁を鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部で支持することで、工事桁の荷重による撓みによる支承部の路盤への食い込み量を小さくすることが可能となる。
前記路盤と前記基礎鋼板との間の不陸を調整する工程を前記路盤上に配置したグラウト注入バックへのグラウト注入により実施する構成により、不陸調整の必要な支承部のみ路盤の不陸を調整が可能で、工事桁を正確な高さで路盤上に支持することが可能となる。
前記路盤と前記基礎鋼板との間の不陸を調整する工程を前記路盤と前記基礎鋼板との間への固化剤流し込みにより実施する構成により、路盤の不陸を調整して工事桁を路盤上に支持することが可能となる。
線路下構造物構築部に対応するレールを支持する工事桁において、前記工事桁の下部に鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部を複数有し、前記複数の支承部を有する工事桁をレール、枕木及びバラストを撤去した路盤上に不陸調整して直接設置する構成により、長年バラスト軌道で受けた履歴荷重により締め固められ支持力の大きい路盤を工事桁の支持体とすることにより施工時間を短縮でき施工コストを低減することが可能となる。また、工事桁を鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部で支持することで、工事桁の荷重による撓みによる支承部の路盤への食い込み量を小さくすることが可能となる。 A process girder in which rails, sleepers and ballasts corresponding to the structure construction part under the track are removed and the roadbed is exposed, and a construction girder in which a plurality of support parts in which a steel plate support and a base steel plate having a larger area than the steel plate support are laminated are installed at the bottom. A step of installing on the roadbed via a temporary support member, a step of adjusting the unevenness between the roadbed and the support portion to support the support portion on the roadbed, and a rail on the construction girder And the process of attaching the adjacent rails to be continuous, the construction time is shortened by using a roadbed with a large bearing capacity that has been compacted by the historical load received on the ballast track for many years as the support for the construction girder. It is possible to reduce the construction cost. In addition, it is possible to reduce the amount of biting of the support part into the roadbed by bending due to the load of the work girder by supporting the work girder with the steel plate support and the support part in which the base steel plate having a larger area than the steel plate support is laminated. Become.
By the configuration in which the step of adjusting the unevenness between the roadbed and the foundation steel plate is performed by the grout injection to the grout injection back arranged on the roadbed, only the support portion that needs the unevenness adjustment is prevented from being uneven. Adjustment is possible, and the construction girder can be supported on the roadbed at an accurate height.
By adjusting the unevenness of the roadbed by adjusting the unevenness of the roadbed, the step of adjusting the unevenness between the roadbed and the basic steel plate is performed by pouring the solidifying agent between the roadbed and the basic steel plate. It becomes possible to support.
In the construction girder for supporting the rail corresponding to the structure construction part under the track, the construction girder has a plurality of bearing parts in which a steel plate bearing and a basic steel plate having a larger area than the steel plate bearing are laminated at the lower part of the construction girder, and the plurality of bearing parts The construction girder with a large bearing capacity that has been compacted by the history load received on the ballast track for many years, is constructed by directly adjusting the construction girder with rails, sleepers and ballast on the roadbed after removing it. By doing so, the construction time can be shortened and the construction cost can be reduced. In addition, it is possible to reduce the amount of biting of the support part into the roadbed by bending due to the load of the work girder by supporting the work girder with the steel plate support and the support part in which the base steel plate having a larger area than the steel plate support is laminated. Become.

工事桁施工前のバラスト軌道の状態を示す側面図である。It is a side view which shows the state of the ballast track | orbit before construction girder construction. 図１の横断面図である。It is a cross-sectional view of FIG. 工事桁設置部のレール、枕木及びバラストを撤去した状態を示す側面図である。It is a side view which shows the state which removed the rail of the construction girder installation part, the sleeper, and the ballast. 図３の横断面図である。It is a cross-sectional view of FIG. 露出した路盤上に不陸調整用のグラウト注入バックを設置した状態を示す側面図である。It is a side view which shows the state which installed the grout injection | pouring bag for unevenness adjustment on the exposed roadbed. 図５の横断面図である。It is a cross-sectional view of FIG. 下部に支承鋼板、基礎鋼板を取り付けた工事桁を配置した状態を示す側面図である。It is a side view which shows the state which has arrange | positioned the construction girder which attached the support steel plate and the basic steel plate to the lower part. 図７の横断面図である。It is a cross-sectional view of FIG. グラウト注入バックにグラウトを注入して路盤と基礎鋼板の間の不陸を調整した状態を示す側面図である。It is a side view which shows the state which injected the grout to the grout injection | pouring back | bag, and adjusted the unevenness between a roadbed and a foundation steel plate. 図９の横断面図である。FIG. 10 is a cross-sectional view of FIG. 9. 路盤と基礎鋼板の間の不陸を調整の他の実施形態を示す側面図である。It is a side view which shows other embodiment which adjusts the unevenness between a roadbed and a basic steel plate. 図１１の横断面図である。It is a cross-sectional view of FIG. 工事桁の下部に支承鋼板のみを取り付けた場合の荷重による支承鋼板の路盤への食い込み状態を示す図である。It is a figure which shows the biting state to the roadbed of the support steel plate by the load at the time of attaching only a support steel plate to the lower part of a construction girder. 工事桁の下部に支承鋼板と支承鋼板より面積の大きな基礎鋼板を取り付けた場合の荷重による支承鋼板の路盤への食い込み状態を示す図である。It is a figure which shows the biting state to the roadbed of the support steel plate by the load at the time of attaching a base steel plate with a larger area than a support steel plate and a support steel plate to the lower part of a construction girder. 工事桁設置後の開削工法の一実施形態の工程を示す図である。It is a figure which shows the process of one Embodiment of the excavation method after construction girder installation. 工事桁設置後の開削工法の一実施形態の工程を示す図である。It is a figure which shows the process of one Embodiment of the excavation method after construction girder installation. 工事桁設置後の開削工法の一実施形態の工程を示す図である。It is a figure which shows the process of one Embodiment of the excavation method after construction girder installation. 従来の工事桁の支持形式を示す図である。It is a figure which shows the support format of the conventional construction girder. 従来の工事桁の支持形式を示す図である。It is a figure which shows the support format of the conventional construction girder.

本発明の実施形態を図により説明する。図１は、工事桁施工前のバラスト軌道の状態を示す側面図であり、図２は、図１の横断面図である。   An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a state of a ballast track before construction girder construction, and FIG. 2 is a cross-sectional view of FIG.

バラスト軌道は、路盤１上にバラスト２が敷設され、バラスト２上に枕木３、レール４が支持される。バラスト軌道は長年の列車通過による履歴荷重により路盤１は締め固められて支持力が大きくなっている。本発明は線路下構造物を開削工法で構築する際、線路下構造物に対応する部分のレール４を支持する工事桁１１を、履歴荷重により締め固められ支持力が大きくなった路盤に支持させ、施工性、施工時間の短い工事桁支持方法を提供する。   In the ballast track, a ballast 2 is laid on the roadbed 1, and sleepers 3 and rails 4 are supported on the ballast 2. In the ballast track, the roadbed 1 is compacted by the historical load caused by the passage of the train for many years, and the supporting force is increased. In the present invention, when constructing the structure under the track by the open-cut method, the construction beam 11 that supports the rail 4 corresponding to the structure under the track is supported by the roadbed that has been compacted by the history load and has increased support force. Provide a construction girder support method with short workability and construction time.

図３は、本発明の線路下構造物構築用工事桁支持方法の第１工程を示す側面図であり、図４はその横断面図である。   FIG. 3 is a side view showing a first step of the construction girder supporting method for constructing an under-track structure according to the present invention, and FIG. 4 is a cross-sectional view thereof.

第１工程では、線路下構造物に対応する部分のレール４、枕木３、バラスト２を撤去し、路盤１の表面が露出するようにする。露出した路盤１の表面を平らに均す。   In the first step, portions of the rail 4, sleepers 3 and ballast 2 corresponding to the structures under the track are removed so that the surface of the roadbed 1 is exposed. Level the exposed surface of the roadbed 1 flat.

図５は、本発明の線路下構造物構築用工事桁支持方法の一実施形態の第２工程を示す側面図であり、図６はその横断面図である。   FIG. 5: is a side view which shows the 2nd process of one Embodiment of the construction beam support method for construction under a track structure of this invention, FIG. 6 is the cross-sectional view.

この実施形態の第２工程では、露出した路盤１の工事桁１１の支承部に対応する位置にグラウト注入バック１０を設置する。グラウト注入バック１０は、路盤１と工事桁１１の支承部との間の不陸を調整するものである。後述するが他の実施形態では、路盤１と工事桁１１の支承部との間の不陸を他の手段により実施するので、図５、図６に示されるグラウト注入バックの路盤１への設置は実施しない。   In the second step of this embodiment, the grout injection bag 10 is installed at a position corresponding to the exposed support portion of the work beam 11 of the roadbed 1. The grout injection bag 10 adjusts the unevenness between the roadbed 1 and the support portion of the construction beam 11. As will be described later, in another embodiment, the unevenness between the roadbed 1 and the support portion of the work girder 11 is implemented by other means, so that the grout injection bag shown in FIGS. 5 and 6 is installed on the roadbed 1. Is not implemented.

図７は、本発明の線路下構造物構築用工事桁支持方法の第３工程を示す側面図であり、図８はその横断面図である。   FIG. 7 is a side view showing a third step of the construction beam supporting method for constructing an under-the-rail structure of the present invention, and FIG. 8 is a cross-sectional view thereof.

この実施形態の第３工程では、工事桁１１を仮支持部材２０を介して露出した路盤１上に設置する。工事桁１１は例えばＨ形鋼等の部材で構成される。工事桁１１の下部には、鋼板支承８と基礎鋼板９を積層した支承部が複数固定される。図では工事桁１１に設置される支承部が２つのものが示されているが、工事桁１１の長さに応じて３つ以上の支承部を設置しても良い。また、工事桁１１は複数のＨ形鋼を接続したものでも良い。仮支持部材２０により支持された工事桁１１の支承部は、不陸調整手段である路盤１上に設置されたグラウト注入バック１０に支持される状態にはなっていない。鋼板支承８と基礎鋼板９からなる支承部は、下部に位置する基礎鋼板９の面積を上部に位置する支承鋼板８の面積より大きくする。支承部の構成をそのようにすることの作用、効果については後述する。工事桁１１に支持された枕木に第１工程で撤去したレール４が支持されている。レール４は工事桁１１の不陸調整後に設置しても良い。   In the third step of this embodiment, the construction beam 11 is installed on the roadbed 1 exposed through the temporary support member 20. The construction girder 11 is made of a member such as H-section steel. A plurality of support portions in which the steel plate support 8 and the basic steel plate 9 are laminated are fixed to the lower part of the work beam 11. In the figure, two support parts are provided for the work girder 11, but three or more support parts may be provided depending on the length of the work girder 11. Further, the construction beam 11 may be one in which a plurality of H-section steels are connected. The support part of the construction girder 11 supported by the temporary support member 20 is not in a state of being supported by the grout injection bag 10 installed on the roadbed 1 which is the unevenness adjusting means. The support part which consists of the steel plate support 8 and the base steel plate 9 makes the area of the base steel plate 9 located in the lower part larger than the area of the support steel plate 8 located in the upper part. The effect | action and effect of making the structure of a support part that way are mentioned later. The rail 4 removed in the first step is supported on the sleepers supported by the construction beam 11. The rail 4 may be installed after the unevenness adjustment of the construction beam 11.

図９は、本発明の線路下構造物構築用工事桁支持方法の第４工程を示す側面図であり、図１０はその横断面図である。   FIG. 9 is a side view showing a fourth step of the construction girder supporting method for constructing a structure under the track of the present invention, and FIG. 10 is a cross-sectional view thereof.

この実施形態の第４工程では、路盤１に設置した不陸調整手段であるグラウト注入バック１０に速硬性のグラウトを注入し、グラウト注入バック１０が工事桁１１の支承部に確実に接するようにする。グラウト注入バック１０内の速硬性のグラウトが硬化すると、工事桁１１が不陸調整されて路盤１上に支持される。この段階で仮支持部材２０を撤去しても良い。   In the fourth step of this embodiment, fast-hardening grout is injected into the grout injection bag 10 which is the unevenness adjusting means installed on the roadbed 1 so that the grout injection bag 10 is surely in contact with the support portion of the construction beam 11. To do. When the fast-hardening grout in the grout injection bag 10 is hardened, the work girder 11 is adjusted unevenly and supported on the roadbed 1. At this stage, the temporary support member 20 may be removed.

図１１は、本発明の線路下構造物構築用工事桁支持方法の不陸調整のための他の実施形態を示す側面図であり、図１２はその横断面図である。   FIG. 11: is a side view which shows other embodiment for the unevenness adjustment of the construction girder support method for construction under a track structure of this invention, and FIG. 12 is the cross-sectional view.

この実施形態の不陸調整はグラウト注入バック１０を用いることなく、直接路盤１と工事桁１１の支承部との間に速硬性の固化剤２１を流し込む。その際、工事桁１１を支持している仮支持部材２０を型枠として兼用しても良い。速硬性の固化剤２１が固化し工事桁１１が路盤１上に支持される。この段階で仮支持部材２０を撤去しても良い。   The uneven adjustment of this embodiment does not use the grout injection bag 10 but directly pours a fast-hardening solidifying agent 21 between the roadbed 1 and the support portion of the construction beam 11. At that time, the temporary support member 20 supporting the construction beam 11 may be used as a mold. The fast-curing solidifying agent 21 is solidified and the construction beam 11 is supported on the roadbed 1. At this stage, the temporary support member 20 may be removed.

図１３（ａ）（ｂ）は、工事桁１１の支承部が鋼板支承８のみの場合の工事桁１１の荷重による撓みによる路盤１に作用する圧力状態を示す図である。工事桁支承部の路盤圧力をバラスト軌道で受けていた履歴圧力以下とするためには、支承部の鋼板を大きくする必要がある。しかし、支承部の鋼板（鋼板支承）を大きくしても、工事桁１１の支承部が鋼板支承８のみの場合、工事桁１１の撓みによる局所的な圧力により、支持力を発揮することが困難となる。   FIGS. 13A and 13B are views showing the pressure state acting on the roadbed 1 due to the bending due to the load of the work beam 11 when the support part of the work beam 11 is only the steel plate support 8. In order to keep the roadbed pressure of the construction girder support part below the historical pressure received on the ballast track, it is necessary to enlarge the steel plate of the support part. However, even if the steel plate (steel plate support) of the support portion is enlarged, if the support portion of the work girder 11 is only the steel plate support 8, it is difficult to exert a supporting force due to local pressure due to the bending of the work girder 11. It becomes.

図１４（ａ）（ｂ）は、工事桁１１の支承部が鋼板支承８と鋼板支承８より面積の大きい基礎鋼板９を積層した場合の工事桁１１の荷重による撓みによる路盤１に作用する圧力状態を示す図である。工事桁１１の荷重による撓みにより面積の大きな基礎鋼板が工事桁１１と同様に撓むことにより、路盤１面に作用する荷重を分散するので路盤１に作用する圧力が小さくなる。そのため、履歴荷重により支持力が大きくなった路盤１が工事桁１１の支持地盤として十分機能する。鋼板支承８と鋼板支承８より面積の大きい基礎鋼板９を組み合わせて支承部を形成することにより、基礎鋼板９の面積（幅）を小さくすることができる。   14A and 14B show the pressure acting on the roadbed 1 due to the bending of the work girder 11 when the support part of the work girder 11 is laminated with the steel plate support 8 and the base steel plate 9 having a larger area than the steel plate support 8. FIG. It is a figure which shows a state. When the foundation steel plate having a large area is bent in the same manner as the work beam 11 due to the bending due to the load of the work beam 11, the load acting on the surface of the roadbed 1 is dispersed, so the pressure acting on the roadbed 1 is reduced. Therefore, the roadbed 1 whose supporting force is increased by the history load functions sufficiently as a supporting ground for the construction beam 11. By forming the support portion by combining the steel plate support 8 and the basic steel plate 9 having a larger area than the steel plate support 8, the area (width) of the basic steel plate 9 can be reduced.

図１５〜図１７は、工事桁１１の設置後の線路下構造物の構築の一実施形態の工程を示す図である。   15-17 is a figure which shows the process of one Embodiment of construction of the structure under a track | line after the installation girder 11 is installed.

図１５に示される工程では、工事桁１１の下部の路盤１の左右に側壁エレメント１６を挿入する。左右の側壁エレメント１６は、橋台及び土留め壁として利用する。   In the process shown in FIG. 15, the side wall elements 16 are inserted on the left and right sides of the roadbed 1 below the construction beam 11. The left and right side wall elements 16 are used as abutments and retaining walls.

図１６に示される工程では、左右の側壁エレメント１６の上端と工事桁１１との間に工事桁支承盛り換え１７を形成し、開削部に対応する工事桁１１を支持する。   In the process shown in FIG. 16, a work girder support replacement 17 is formed between the upper ends of the left and right side wall elements 16 and the work girder 11 to support the work girder 11 corresponding to the cut portion.

図１７に示される工程では、左右の側壁エレメント１６で支持された路盤１の上部を一次掘削し、その部分に型枠を設置し鉄筋コンクリート製の上床版１８を形成する。その後、左右の側壁エレメント１６で支持された路盤１の下部を二次掘削し、その部分に型枠を設置し鉄筋コンクリート製の下床版１９を形成する。   In the process shown in FIG. 17, the upper part of the roadbed 1 supported by the left and right side wall elements 16 is primarily excavated, and a formwork is installed in that portion to form an upper floor slab 18 made of reinforced concrete. Thereafter, the lower part of the roadbed 1 supported by the left and right side wall elements 16 is secondarily excavated, and a formwork is installed in that part to form a reinforced concrete lower floor slab 19.

しかし、工事桁１１の下部路盤の開削方式として図１５〜図１７に示されるものに限定するものではなく、他の開削方式でも良い。   However, the excavation method of the lower roadbed of the construction girder 11 is not limited to the one shown in FIGS. 15 to 17, and other excavation methods may be used.

以上のように、本発明の線路下構造物構築用工事桁支持方法及び線路下構造物構築用工事桁支持構造によれば、長年バラスト軌道で受けた履歴荷重により締め固められ支持力の大きい路盤を工事桁の支持体とすることにより施工時間を短縮でき施工コストを低減することが可能となる。また、工事桁を鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部で支持することで、工事桁の荷重による撓みによる支承部の路盤への食い込み量を小さくすることが可能となる。   As described above, according to the construction girder support method for constructing under-line structures and the construction girder support structure for constructing under-line structures according to the present invention, the roadbed having a large support force that is compacted by the historical load received on the ballast track for many years. By using as a support for the construction girder, the construction time can be shortened and the construction cost can be reduced. In addition, it is possible to reduce the amount of biting of the support part into the roadbed by bending due to the load of the work girder by supporting the work girder with the steel plate support and the support part in which the base steel plate having a larger area than the steel plate support is laminated. Become.

１：路盤、２：バラスト、３：枕木、４：レール、５：支持杭、６：地盤改良、７：直接基礎、８：鋼板支承、９：基礎鋼板、１０：グラウト注入バック、１１：工事桁、１２：支持杭、１３：土留め壁、１４：支持層、１５：工事杭、１６：側壁エレメント、１７：工事桁支承盛り換え、１８：上床版、１９：下床版、２０：仮支持部材、２１：固化剤   1: roadbed, 2: ballast, 3: sleeper, 4: rail, 5: support pile, 6: ground improvement, 7: direct foundation, 8: steel plate support, 9: foundation steel plate, 10: grout injection bag, 11: construction Girder, 12: Support pile, 13: Earth retaining wall, 14: Support layer, 15: Construction pile, 16: Side wall element, 17: Reconstruction of construction girder support, 18: Upper floor slab, 19: Lower floor slab, 20: Temporary Support member, 21: solidifying agent

Claims (4)

線路下構造物構築部に対応するレール、枕木及びバラストを撤去し路盤を露出させる工程と、
下部に鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部を複数設置した工事桁を仮支持部材を介して前記路盤上に設置する工程と、
前記路盤と前記支承部との間の不陸を調整して前記支承部を前記路盤上に支持する工程と、
前記工事桁上のレールと隣接するレールとを連続するように取り付ける工程と、
を有することを特徴とする線路下構造物構築用工事桁支持方法。 Removing the rails, sleepers and ballast corresponding to the structure construction part under the track and exposing the roadbed;
A step of installing a work girder in which a plurality of support portions in which a steel plate support and a base steel plate having a larger area than the steel plate support are stacked are installed on the roadbed via a temporary support member;
Adjusting the unevenness between the roadbed and the support portion to support the support portion on the roadbed;
Attaching the rail on the construction girder and the adjacent rail so as to be continuous;
A construction girder support method for constructing a structure under a track, characterized by comprising: 前記路盤と前記基礎鋼板との間の不陸を調整する工程を前記路盤上に配置したグラウト注入バックへのグラウト注入により実施することを特徴とする請求項１に記載の線路下構造物構築用工事桁支持方法。 2. The under-track structure construction according to claim 1, wherein the step of adjusting unevenness between the roadbed and the base steel plate is performed by grout injection to a grout injection back disposed on the roadbed. Construction girder support method. 前記路盤と前記基礎鋼板との間の不陸を調整する工程を前記路盤と前記基礎鋼板との間への固化剤の流し込みにより実施することを特徴とする請求項１に記載の線路下構造物構築用工事桁支持方法。 The under-track structure according to claim 1, wherein the step of adjusting unevenness between the roadbed and the foundation steel plate is performed by pouring a solidifying agent between the roadbed and the foundation steel plate. Construction girder support method for construction. 線路下構造物構築部に対応するレールを支持する工事桁において、前記工事桁の下部に鋼板支承と前記鋼板支承より面積の大きな基礎鋼板を積層した支承部を複数有し、前記複数の支承部を有する工事桁をレール、枕木及びバラストを撤去した路盤上に不陸調整して直接設置することを特徴とする線路下構造物構築用工事桁支持構造。 In the construction girder for supporting the rail corresponding to the structure construction part under the track, the construction girder has a plurality of bearing parts in which a steel plate bearing and a basic steel plate having a larger area than the steel plate bearing are laminated at the lower part of the construction girder, and the plurality of bearing parts A construction girder support structure for constructing a structure under the track, characterized in that a construction girder having a rail is installed directly on a roadbed from which rails, sleepers and ballasts have been removed.
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