JP4424744B2 - Bridge replacement method - Google Patents

Bridge replacement method Download PDF

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JP4424744B2
JP4424744B2 JP2005006784A JP2005006784A JP4424744B2 JP 4424744 B2 JP4424744 B2 JP 4424744B2 JP 2005006784 A JP2005006784 A JP 2005006784A JP 2005006784 A JP2005006784 A JP 2005006784A JP 4424744 B2 JP4424744 B2 JP 4424744B2
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bridge
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pier
bridge girder
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淳司 澤井
博志 益子
篤 永井
光則 村尾
佳楠子 多久和
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Sumitomo Mitsui Construction Co Ltd
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Description

本発明は、既設橋脚と既設橋桁とからなる既設橋梁を、新設橋脚と新設橋桁とからなる新設橋梁に架け替えるための橋梁架替工法に関する。     The present invention relates to a bridge replacement method for replacing an existing bridge composed of an existing pier and an existing bridge girder with a new bridge composed of a new pier and a new bridge girder.

従来、鉄道や道路においては、古くなった既設の橋梁（本明細書において“既設橋梁”と称する）を新しい橋梁（本明細書において“新設橋梁”とする）に架け替えるための橋梁架替工事を行う必要があり、そのための種々の工法が提案されている（例えば、特許文献１参照）。     Conventionally, in railways and roads, a bridge replacement work for replacing an existing bridge (referred to as “existing bridge” in this specification) with a new bridge (referred to as “new bridge” in this specification). Therefore, various construction methods have been proposed (for example, see Patent Document 1).

以下、鉄道における、従来の橋梁架替工法の一例について図６及び図７に沿って説明する。ここで、図６(a)は、既設橋梁１０１を支持するように仮設橋梁１２１を構築した状態を示す断面図であり、同図(b)は、既設橋桁１０３に縦孔１０３ａを穿設した状態を示す断面図であり、同図(c)は、枕木１０４を支持するように第２上部橋脚１２５等を配置した状態を示す断面図である。また、図７(a)は、撤去しようとする既設橋梁１０１を斜線で示した断面図であり、同図(b)は、該既設橋梁１０１を撤去した状態を示す断面図であり、同図(c)は、新設橋梁１１１を構築した状態を示す断面図である。     Hereinafter, an example of a conventional bridge replacement method in a railway will be described with reference to FIGS. 6 and 7. Here, FIG. 6A is a cross-sectional view showing a state in which the temporary bridge 121 is constructed so as to support the existing bridge 101, and FIG. 6B shows that the vertical bridge 103a is formed in the existing bridge girder 103. It is sectional drawing which shows a state, The figure (c) is sectional drawing which shows the state which has arrange | positioned 2nd upper bridge pier 125 grade | etc., So that the sleeper 104 may be supported. FIG. 7A is a cross-sectional view showing the existing bridge 101 to be removed with diagonal lines, and FIG. 7B is a cross-sectional view showing a state where the existing bridge 101 is removed. (c) is sectional drawing which shows the state which constructed the new bridge 111. FIG.

図６(a)中の符号１０１は、既設橋脚１０２と既設橋桁１０３とからなる既設橋梁を示す。また、符号１０４は枕木を示し、符号１０５はレールを示し、符号１０６は鉄道の車両限界を示す。さらに、符号１２１は、工事の期間だけ構築される仮設橋梁を示す。なお、符号１２２に示す部分を下部橋脚と称し、符号１２４で示す部分を第１上部橋脚と称し、符号１２３で示す部分を仮設橋桁と称することとする。この図に示す段階では、第１上部橋脚１２４は既設橋桁１０３を支持した状態となっている。     Reference numeral 101 in FIG. 6A indicates an existing bridge composed of an existing bridge pier 102 and an existing bridge girder 103. Reference numeral 104 denotes a sleeper, reference numeral 105 denotes a rail, and reference numeral 106 denotes a railroad vehicle limit. Further, reference numeral 121 denotes a temporary bridge constructed only during the construction period. The portion denoted by reference numeral 122 is referred to as a lower pier, the portion denoted by reference numeral 124 is referred to as a first upper pier, and the portion denoted by reference numeral 123 is referred to as a temporary bridge girder. In the stage shown in this figure, the first upper pier 124 is in a state of supporting the existing bridge girder 103.

次に、図６(b)に示すように、各枕木１０４の端部に一致するように、既設橋桁１０３に縦孔１０３ａを穿設する。そして、図６(c)に示すように、各枕木１０４の両端を挟み込むように断面I型の工事桁１３０を配置し、各工事桁１３０と前記仮設橋桁１２３との間には、鉛直に第２上部橋脚１２５をそれぞれ配置する。この状態では、第２上部橋脚１２５、仮設橋桁１２３及び下部橋脚１２２が、レール１０５や枕木１０４を支持するための橋桁（仮設橋桁）を構成する。既設橋梁１０１（図７(a)の斜線部分）及び第１上部橋脚１２４は不要となるので、それらを撤去する（図７(a)及び(b)参照）。     Next, as shown in FIG. 6 (b), a vertical hole 103 a is formed in the existing bridge girder 103 so as to coincide with the end of each sleeper 104. Then, as shown in FIG. 6 (c), an I-shaped construction girder 130 is arranged so as to sandwich both ends of each sleeper 104, and the vertical girder between each construction girder 130 and the temporary bridge girder 123 is arranged vertically. Two upper piers 125 are arranged respectively. In this state, the second upper pier 125, the temporary bridge girder 123, and the lower pier 122 constitute a bridge girder (temporary bridge girder) for supporting the rail 105 and the sleepers 104. Since the existing bridge 101 (shaded portion in FIG. 7A) and the first upper pier 124 are not necessary, they are removed (see FIGS. 7A and 7B).

次に、同図(c)に示すように、新設橋梁１１１を構築する。なお、仮設橋梁１２１はその後撤去する。
特開２００２−９７６０８号公報 Next, a new bridge 111 is constructed as shown in FIG. The temporary bridge 121 is then removed.
JP 2002-97608 A

しかしながら、上述した従来工法では、既設橋桁１０３をその設置場所で順次解体し、一方では、列車の運行を確保するための仮設橋桁を構築しているが、それらの作業の間は列車の運行を休止しなければならず、列車の運行に少なからず支障を与えてしまうという問題があった。     However, in the conventional construction method described above, the existing bridge girder 103 is sequentially dismantled at the installation location, and on the other hand, a temporary bridge girder for securing the operation of the train is constructed. There was a problem that the train operation had to be interrupted, which caused a considerable hindrance to train operation.

また、一般に、列車や車両の運行を休止させる場合（特に、列車の場合）には、運行休止時や運行再開時に様々な作業（例えば、列車の運行の安全を確認するための作業など）を必要とする。上述した従来工法の場合には、既設橋桁の解体作業、及び仮設橋桁の構築作業（図６(b)に示すように縦孔１０３ａを既設橋桁１０３に穿設する作業や、工事桁１３０の設置作業や、第２上部橋脚１２５の設置作業等）のために何度も運行の休止及び再開を繰り返さなければならず、作業が煩雑化するという問題があった。     In general, when the operation of trains and vehicles is suspended (especially in the case of trains), various operations (for example, operations for confirming the safety of train operations) are performed when operations are suspended or resumed. I need. In the case of the conventional method described above, the dismantling work of the existing bridge girder and the construction work of the temporary bridge girder (the work of drilling the vertical hole 103a in the existing bridge girder 103 as shown in FIG. There is a problem that the operation is complicated because the operation must be repeatedly stopped and resumed for the operation and the installation work of the second upper pier 125).

本発明は、列車等の運行を休止する期間を短縮すると共に、運行休止回数を少なくして作業の煩雑化を防止する橋梁架替工法を提供することを目的とするものである。     An object of the present invention is to provide a bridge replacement method that shortens the period during which a train or the like is suspended, and reduces the number of operation suspensions to prevent complication of work.

請求項１に係る発明は、既設橋脚（図１(a)及び(b)の符号２参照）と既設橋桁（同図の符号３参照）とからなる既設橋梁（同図の符号１参照）を、新設橋脚（図５(a)の符号１２参照）と新設橋桁（同図の符号１３参照）とからなる新設橋梁（同図の符号１１参照）に架け替えるための橋梁架替工法において、
各既設橋脚（２）の近傍に仮設橋脚（２２）を構築する工程（図１(a)(b)(c)参照）と、
該構築した仮設橋脚（２２）に前記既設橋桁（３）を支持させる工程（図１(b)参照）と、
前記仮設橋脚（２２）に支持された部分（Ｚ１）よりも下方（Ｚ２）にて前記既設橋脚（２）を切断する工程（図２(a)(b)参照）と、
該切断された部分（Ｚ２）より下側の既設橋脚（２）を撤去する工程（図３(a)(b)参照）と、
前記既設橋桁（３）の下方の空間（Ｓ）に新設橋脚（１２）を構築する工程（図４(a)(b)参照）と、
前記既設橋桁（３）の下方の空間（Ｓ）を橋梁幅方向（Ｙ）に通り抜けるように横取り用ガイド装置（３０）を延設配置する工程（図５(a)(b)参照）と、
前記既設橋桁（３）を該横取り用ガイド装置（３０）で支持した形で一体的に移動させることにより撤去する工程（図５(b)の符号Ａ１参照）と、
前記新設橋桁（１３）を、前記横取り用ガイド装置（３０）で支持した形で移動させて前記新設橋脚（１２）の上方に設置する工程（図５(b)の符号Ａ２参照）と、
を有することを特徴とする。 The invention according to claim 1 includes an existing bridge (see reference numeral 1 in the figure) composed of an existing pier (see reference numeral 2 in FIGS. 1A and 1B) and an existing bridge girder (see reference numeral 3 in the figure). In the bridge replacement method for replacing a new bridge (see reference numeral 11 in the figure) composed of a new pier (see reference numeral 12 in FIG. 5 (a)) and a new bridge girder (see reference numeral 13 in the figure),
A process of constructing a temporary pier (22) in the vicinity of each existing pier (2) (see FIGS. 1 (a) (b) (c));
A step of supporting the existing bridge girder (3) on the constructed temporary pier (22) (see FIG. 1 (b));
Cutting the existing pier (2) below (Z 2 ) below the portion (Z 1 ) supported by the temporary pier (22) (see FIGS. 2 (a) and (b));
Removing the existing pier (2) below the cut portion (Z 2 ) (see FIGS. 3 (a) (b));
A step of constructing a new pier (12) in the space (S) below the existing bridge girder (3) (see FIGS. 4 (a) and (b));
A step (see FIGS. 5A and 5B) of extending and arranging a horizontal guide device (30) so as to pass through the space (S) below the existing bridge girder (3) in the bridge width direction (Y);
A step of removal by moving integrally (see reference symbol A 1 in FIG. 5 (b)) in the form of the supported by the existing bridge beam (3) for the transverse-up guide device (30),
The new bridge beam (13), and the step of installing above the pre-emption guide device (30) in the moved in supporting form new pier (12) (reference symbol A 2 in FIG. 5 (b)),
It is characterized by having.

請求項２に係る発明は、図１(c)に例示するように、請求項１に係る発明において、前記仮設橋脚（２２）を、橋梁幅方向（Ｙ）に沿って少なくとも２本（例えば、２２ａ，２２ｂ参照）、前記既設橋脚（２）が設置されている最大幅（ΔＹ１）よりも広い離間距離（ΔＹ２）で配置し、
これら２本の仮設橋脚（例えば、２２ａ，２２ｂ）に中間フレーム（４０）を架渡し、
該中間フレーム（４０）に前記既設橋桁（３）を支持させる、ことを特徴とする。 In the invention according to claim 2, as illustrated in FIG. 1 (c), in the invention according to claim 1, at least two temporary piers (22) are provided along the bridge width direction (Y) (for example, 22a, 22b), arranged with a separation distance (ΔY 2 ) wider than the maximum width (ΔY 1 ) where the existing pier (2) is installed,
The intermediate frame (40) is bridged between these two temporary piers (for example, 22a and 22b)
The intermediate bridge (40) supports the existing bridge girder (3).

請求項３に係る発明は、請求項２に係る発明において、前記仮設橋脚（２２）を、橋梁長手方向（Ｘ）に沿って複数本配置し（例えば、２２ａ，２２ｃ，２２ｅ，２２ｇ）、これら複数本の仮設橋脚（例えば、２２ａ，２２ｃ，２２ｅ，２２ｇ）に前記中間フレーム（４０）を架渡した、ことを特徴とする。     The invention according to claim 3 is the invention according to claim 2, wherein a plurality of the temporary piers (22) are arranged along the longitudinal direction (X) of the bridge (for example, 22a, 22c, 22e, 22g), and these The intermediate frame (40) is bridged over a plurality of temporary piers (for example, 22a, 22c, 22e, 22g).

請求項４に係る発明は、請求項２又は３に記載の発明において、図５(b) に例示するように、前記既設橋桁（３）の撤去のための移動は、前記中間フレーム（４０）を該既設橋桁（３）に連結させた状態で行う、ことを特徴とする。     According to a fourth aspect of the invention, in the invention of the second or third aspect, as illustrated in FIG. 5 (b), the movement for removing the existing bridge girder (3) is performed by the intermediate frame (40). Is performed in a state of being connected to the existing bridge girder (3).

なお、括弧内の番号などは、図面における対応する要素を示す便宜的なものであり、従って、本記述は図面上の記載に限定拘束されるものではない。     The numbers in parentheses are for the sake of convenience indicating the corresponding elements in the drawings, and therefore the present description is not limited to the descriptions on the drawings.

請求項１に係る発明によれば、既設橋桁の撤去作業を開始する直前までは、列車や車両の通行を休止しなくても作業を進めることができる。既設橋桁の撤去作業の開始から新設橋桁の設置作業の完了までは列車や車両の通行を休止させる必要があるものの、通行を休止させなければならない時間は従来工法の場合に比べて短くすることができ、列車等の運行への支障を低減することができる。ところで、一般に、列車の運行を休止させる場合には、運行休止時や運行再開時に様々な作業（例えば、列車の運行の安全を確認するための作業など）を必要とする。設置されている状態の既設橋桁を順次解体していくような従来工法の場合には、列車の運行の休止及び再開を繰り返して行う必要があるので作業が繁雑となってしまうが、本発明によれば、既設橋桁の解体は撤去後に別の場所（橋梁を設置する場所以外の場所）で行うことができるので列車の運行を休止させる回数を少なくでき、その分、作業の煩雑化を軽減できる。     According to the first aspect of the present invention, it is possible to proceed with the work without stopping the passage of the train or the vehicle until immediately before the removal work of the existing bridge girder is started. Although it is necessary to stop the passage of trains and vehicles from the start of the removal work of the existing bridge girder to the completion of the installation work of the new bridge girder, the time required to stop the passage may be shorter than in the case of the conventional construction method It is possible to reduce obstacles to the operation of trains and the like. By the way, generally, when stopping a train operation, various operations (for example, a task for confirming the safety of the train operation) are required when the operation is stopped or resumed. In the case of a conventional construction method in which existing bridge girders in the installed state are dismantled sequentially, it is necessary to repeatedly stop and resume train operation, so the work becomes complicated. According to this, dismantling of the existing bridge girder can be done in another place (place other than the place where the bridge is installed) after removal, so the number of times that the train operation is suspended can be reduced, and the work complexity can be reduced accordingly. .

請求項２に係る発明によれば、既設橋脚を切断した状態では、橋脚切断部より上方の部分（特に、既設橋桁）は中間フレームにより補強された状態となるので、該橋脚切断後も列車や車両を安全に通行させることが可能となる。また、中間フレームの採用により、前記既設橋脚が設置されている最大幅よりも広い離間距離を取るように２本の仮設橋脚を配置できるため、既設橋桁の下方にて、既設橋脚の撤去作業、新設橋脚を設置するためのスペースを十分に確保することができる。同時に、中間フレーム及び既設橋桁を広いスパンの仮設橋脚により安定的に支持することができる。     According to the invention according to claim 2, in the state where the existing pier is cut, the portion above the pier cutting portion (particularly, the existing bridge girder) is reinforced by the intermediate frame. It is possible to pass the vehicle safely. In addition, by adopting an intermediate frame, two temporary piers can be arranged to take a wider distance than the maximum width at which the existing pier is installed, so that the removal work of the existing pier under the existing bridge girder, Sufficient space for installing the new pier can be secured. At the same time, the intermediate frame and the existing bridge girder can be stably supported by the wide span temporary bridge pier.

請求項３に係る発明によれば、橋梁幅方向に沿って配置された複数本の仮設橋脚と、橋梁長手方向に沿って配置された複数本の仮設橋脚とにより中間フレームが支持されることとなるため、複数本の仮設橋脚と中間フレームとにより堅固な支持構造を構成でき、既設橋桁をより安定的に支持することができる。     According to the invention of claim 3, the intermediate frame is supported by a plurality of temporary piers arranged along the bridge width direction and a plurality of temporary piers arranged along the longitudinal direction of the bridge; Therefore, a solid support structure can be constituted by the plurality of temporary bridge piers and the intermediate frame, and the existing bridge girder can be supported more stably.

請求項４に係る発明によれば、前記既設橋桁の撤去のための移動は、前記中間フレームを該既設橋桁に連結させた状態で行われるため、中間フレームにより既設橋桁が補強された状態となるので、橋梁長手方向に長い橋桁であっても、撤去作業を安定的に行うことが出来る。そして、長い橋桁を一度で撤去できるため、複数回に分けて撤去する場合に比べ、撤去作業時間を短縮でき、列車や車両の通行を休止する時間も短縮することができる。     According to the invention which concerns on Claim 4, since the movement for removal of the said existing bridge girder is performed in the state which connected the said intermediate frame to this existing bridge girder, it will be in the state by which the existing bridge girder was reinforced by the intermediate frame. Therefore, even a bridge girder that is long in the longitudinal direction of the bridge can be removed stably. And since a long bridge girder can be removed at once, compared with the case where it removes in multiple steps, removal work time can be shortened and the time which stops the passage of a train and vehicles can also be shortened.

以下、図１乃至図５に沿って、本発明を実施するための最良の形態について説明する。     Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. 1 to 5.

図１(a)は、既設橋梁の近傍に仮設橋脚や中間フレームを配置した状態の一例を示す正面図であり、同図(b)は、そのＢ１矢視図であり、同図(c)は、(a)のＣ−Ｃ断面図である。図２(a)は、既設橋脚２の切断箇所等の一例を示す正面図であり、同図(b)は、そのＢ２矢視図である。図３(a)は、既設橋脚の切断後の様子の一例を示す正面図であり、同図(b)は、そのＢ３矢視図である。図４(a)は、新設橋脚１２を構築した状態の一例を示す正面図であり、同図(b)は、そのＢ４矢視図である。図５(a)は、新設橋桁を設置する様子の一例を示す正面図であり、同図(b)は、そのＢ５矢視図である。 1 (a) is a front view showing an example of a state of arranging the temporary piers and the intermediate frame in the vicinity of the existing bridges, Fig (b) is its B 1 arrow view, FIG. (C ) Is a cross-sectional view taken along the line CC of FIG. 2 (a) is a front view showing an example of such disconnection point of the existing piers 2, FIG. (B) is a B 2 arrow view. 3 (a) is a front view showing an example of a state after cutting of the existing piers, FIG (b) is a B 3 arrow view. 4 (a) is a front view showing an example of a state in which to build a new bridge pier 12, FIG. (B) is a B 4 arrow view. 5 (a) is a front view showing an example of how to install the new bridge girder, FIG. (B) is a B 5 arrow view.

本明細書においては、車両や列車が橋梁を通行する方向（図示Ｘ方向）を“橋梁長手方向”と称し、該方向と直交する水平な方向（図示Ｙ方向）を“橋梁幅方向”と称するものとする。     In the present specification, a direction in which vehicles and trains pass through a bridge (X direction in the drawing) is referred to as a “bridge longitudinal direction”, and a horizontal direction (Y direction in the drawing) perpendicular to the direction is referred to as a “bridge width direction”. Shall.

本発明に係る橋梁架替工法は、既設橋脚２と既設橋桁３とからなる既設橋梁１（図１(b)参照）を、新設橋脚１２と新設橋桁１３とからなる新設橋梁１１（図５(a)参照）に架け替えるための工法であって、
(1) 各既設橋脚２の近傍に仮設橋脚２２を構築する工程（図１(a)(b)(c)参照）と、
(2) 該構築した仮設橋脚２２に前記既設橋桁３を支持させる工程（図１(b)参照）と、
(3) 前記仮設橋脚２２に支持された部分Ｚ１よりも下方Ｚ２にて前記既設橋脚２を切断する工程（図２(a)(b)参照）と、
(4) 該切断された部分Ｚ２より下側の既設橋脚２を撤去する工程（図３(a)(b)参照）と、
(5) 前記既設橋桁３の下方の空間（図３(b)の符号Ｓ参照）に新設橋脚１２を構築する工程（図４(a)(b)参照）と、
(6) 前記既設橋桁３の下方の空間Ｓを橋梁幅方向Ｙに通り抜けるように横取り用ガイド装置３０を延設配置する工程（図５(a)(b)参照）と、
(7) 前記既設橋桁３を前記横取り用ガイド装置３０で支持した形で一体的に移動させることにより撤去する工程（図５(b)の符号Ａ１参照）と、
(8) 前記新設橋桁１３を、前記横取り用ガイド装置３０で支持した形で移動させて前記新設橋脚１２の上方に設置する工程（図５(b)の符号Ａ２参照）と、
により構成される。なお、(1)仮設橋脚２２の構築、(2)既設橋桁３の支持、(3)既設橋脚２の切断、(4)既設橋脚２の撤去、(5)新設橋脚１２の構築、(7)既設橋桁３の撤去、(8)新設橋桁１３の設置はその順序で実施すると良い。(6)横取り用ガイド装置３０の設置は、(7)既設橋桁３の撤去までに実施すれば良いが、早い段階で横取り用ガイド装置３０を設置してしまうと他の作業の邪魔となるおそれもあるので、作業の効率性の点からは、仮設橋脚２２の構築、既設橋脚２の切断及び撤去、並びに新設橋脚１２の構築が完了するまでは、この横取り用ガイド装置３０の設置を行わない方が好ましい。 The bridge replacement method according to the present invention is based on the existing bridge 1 (see FIG. 1 (b)) including the existing pier 2 and the existing bridge girder 3, and the new bridge 11 (see FIG. It is a construction method to replace (a)
(1) a step of constructing a temporary pier 22 in the vicinity of each existing pier 2 (see FIGS. 1 (a) (b) (c));
(2) supporting the existing bridge girder 3 on the constructed temporary pier 22 (see FIG. 1 (b));
(3) a step of cutting the existing pier 2 at a lower Z 2 than the portion Z 1 supported by the temporary pier 22 (see FIGS. 2A and 2B);
And (4) the cut portions Z 2 the step of removing the existing piers second lower (FIG. 3 (a) (b) see)
(5) constructing a new pier 12 in the space below the existing bridge girder 3 (see S in FIG. 3B) (see FIGS. 4A and 4B);
(6) a step (see FIGS. 5A and 5B) of extending and arranging the side guide device 30 so as to pass through the space S below the existing bridge girder 3 in the bridge width direction Y;
And (7) the existing bridge girder 3 the step of removal by moving integrally with the form of being supported by the pre-emption guide device 30 (see reference numeral A 1 in FIG. 5 (b)),
And (8) the new bridge girder 13 a step of installing the move by the support and form in intercepted guide device 30 above the new pier 12 (reference numeral A 2 in FIG. 5 (b)),
Consists of. (1) Construction of temporary pier 22, (2) Support of existing bridge girder 3, (3) Cutting of existing pier 2, (4) Removal of existing pier 2, (5) Construction of new pier 12, (7) The removal of the existing bridge girder 3 and (8) installation of the new bridge girder 13 should be carried out in that order. (6) Installation of the side guide device 30 may be carried out by (7) removal of the existing bridge girder 3, but if the side guide device 30 is installed at an early stage, it may interfere with other operations. Therefore, from the viewpoint of work efficiency, the pre-installation guide device 30 is not installed until the construction of the temporary pier 22, the cutting and removal of the existing pier 2 and the construction of the new pier 12 are completed. Is preferred.

本発明に係る工法によれば、既設橋桁３は一体的に移動させて撤去できるので、従来工法のように、その設置場所で順次解体してから撤去する必要は無く、撤去作業時間を短縮化でき、列車等の運行を休止させなければならない時間も短縮化できる。また、従来工法のように、列車等の運行を確保するための仮設橋桁を構築する必要が無く、仮設橋桁の構築に伴う列車等の休止も回避することができる。つまり、既設橋桁３の撤去作業を開始する直前までは、列車や車両の通行を休止しなくても作業（仮設橋脚２２の構築作業や、既設橋脚２の切断作業及び撤去作業や、新設橋脚１２の構築作業等）を進めることができるので、列車等の運行への支障を低減することができる。さらに、従来工法のように、橋梁の設置箇所において既設橋桁の解体や仮設橋桁の構築を行う場合には列車等の運行の休止及び再開を繰り返して行う必要があるので作業（運行休止時や運行再開時に必要な作業）が煩雑となってしまうが、本発明の場合には、既設橋桁の解体は橋桁撤去後に別の場所で行うことができ、また、仮設橋桁の構築の必要が無いことから、列車等の運行を休止させる回数を少なくでき、その分、作業の煩雑化を軽減できる。     According to the construction method according to the present invention, the existing bridge girder 3 can be moved and removed as a whole, so there is no need to dismantle it at the installation location and remove it as in the conventional construction method, and the removal work time is shortened. It is also possible to shorten the time required to stop the operation of the train and the like. In addition, unlike the conventional method, it is not necessary to construct a temporary bridge girder for securing operation of a train or the like, and it is possible to avoid the suspension of a train or the like accompanying the construction of a temporary bridge girder. In other words, until the start of the removal work of the existing bridge girder 3, the work (the construction work of the temporary pier 22, the cutting work and the removal work of the existing pier 2, and the new pier 12 are not required without stopping the passage of trains and vehicles). Therefore, it is possible to reduce troubles in the operation of trains and the like. Furthermore, when dismantling existing bridge girders or constructing temporary bridge girders at the place where the bridge is installed as in the conventional construction method, it is necessary to repeatedly stop and restart the operation of the train etc. However, in the case of the present invention, the dismantling of the existing bridge girder can be performed in another place after the bridge girder is removed, and there is no need to construct a temporary bridge girder. The number of times that the operation of the train or the like is stopped can be reduced, and the complication of the work can be reduced accordingly.

ところで、仮設橋脚２２により既設橋桁３を支持する方法としては、図１(b)に示すように、現場打ち鉄筋コンクリートから構築された中間フレーム４０をそれらの間に介装させておいて、該フレーム４０を介して既設橋桁３を支持する方法がある。例えば、中間フレーム４０を仮設橋脚２２と既設橋脚２（好ましくは、既設橋脚２の上端部分２ａ）とにそれぞれ連結すると良い。このような中間フレーム４０を使用する場合、既設橋脚２を切断した状態では、橋脚切断部Ｚ２より上方の部分（特に、既設橋桁３）は、この中間フレーム４０により補強された状態となるので（つまり、元々強度がある既設橋桁３をさらに補強する状態となるので）、該橋脚切断後も列車や車両を安全に通行させることが可能となる。 By the way, as a method of supporting the existing bridge girder 3 by the temporary bridge pier 22, as shown in FIG. 1 (b), an intermediate frame 40 constructed from on-site reinforced concrete is interposed between them, and the frame There is a method of supporting the existing bridge girder 3 through 40. For example, the intermediate frame 40 may be connected to the temporary pier 22 and the existing pier 2 (preferably, the upper end portion 2a of the existing pier 2). When using such an intermediate frame 40, in the state where the cut existing piers 2, from above the portion pier cuts Z 2 (in particular, the existing bridge beam 3) Because the state of being reinforced by the intermediate frame 40 (That is, since the existing bridge girder 3 that originally has strength is in a state of being further reinforced), it is possible to safely pass trains and vehicles even after the pier is cut.

なお、仮設橋脚２２は、橋梁幅方向Ｙに沿って少なくとも２本配置すると良い（例えば、図１(c)にて符号２２ａ，２２ｂを付した２本の仮設橋脚、或いは符号２２ｃ，２２ｄを付した２本の仮設橋脚、或いは符号２２ｅ，２２ｆを付した２本の仮設橋脚、或いは符号２２ｇ，２２ｈを付した２本の仮設橋脚を参照）。そして、それら２本の仮設橋脚（例えば、２２ａ，２２ｂ）は、前記既設橋脚２が設置されている最大幅（既設橋脚２が図１(b)(c)に示すように、橋梁幅方向Ｙに２本配置されているような場合には、符号ΔＹ１で示すように、一方の既設橋脚２の外側面と他方の既設橋脚２の外側面との間の距離を言い、例えば図５に符号１２で示すように、２本では無くて１本だけ配置されているような場合にはその１本の両外側面の間の距離を言う）よりも広い離間距離（符号ΔＹ２で示すような、２本の仮設橋脚の離間距離）で配置し、これら２本の仮設橋脚（例えば、２２ａ，２２ｂ）に中間フレーム４０を架渡し、該中間フレーム４０に前記既設橋桁３を支持させるようにすると良い。このような仮設橋脚に中間フレーム４０を支持させるためには、中間フレーム４０は、図１(c)に符号４０Ｙで示すように、前記仮設橋脚の離間距離ΔＹ２より長く橋梁幅方向Ｙに延設されている部分を有している必要がある。上述のように、仮設橋脚の離間距離ΔＹ２を前記最大幅ΔＹ１よりも広くした場合には、既設橋桁３の下方にて、既設橋脚２の撤去作業、新設橋脚１２を設置するためのスペースを十分に確保することができる（図１(b)の符号Ｓ参照）。また、中間フレーム４０及び既設橋桁３を広いスパン（図１(c)の符号ΔＹ３参照）の仮設橋脚により安定的に支持することができる。なお、図１(c)の例では、橋梁幅方向Ｙに沿って配置された２本の仮設橋脚が、橋梁長手方向Ｘに沿って４組配置されていて、それら８本の仮設橋脚２２ａ，…に１つの中間フレーム４０が架渡されているが、各２本の仮設橋脚（例えば、符号２２ａ，２２ｂを付した２本の仮設橋脚、或いは符号２２ｃ，２２ｄを付した２本の仮設橋脚、或いは符号２２ｅ，２２ｆを付した２本の仮設橋脚、或いは符号２２ｇ，２２ｈを付した２本の仮設橋脚）にそれぞれ別々の中間フレームを架渡すようにしても良い。 Note that at least two temporary piers 22 are preferably arranged along the bridge width direction Y (for example, two temporary piers denoted by reference numerals 22a and 22b in FIG. 1 (c), or denoted by reference numerals 22c and 22d. The two temporary piers, or two temporary piers labeled 22e and 22f, or two temporary piers labeled 22g and 22h). And these two temporary bridge piers (for example, 22a, 22b) have the maximum width in which the existing pier 2 is installed (the existing pier 2 is in the bridge width direction Y as shown in FIGS. 1B and 1C). 2, the distance between the outer surface of one existing pier 2 and the outer surface of the other existing pier 2, as shown by reference sign ΔY 1 , for example, in FIG. As indicated by reference numeral 12, when only one is arranged instead of two , the distance is larger than the distance between the two outer surfaces (as indicated by reference numeral ΔY2). And the intermediate frame 40 is bridged between the two temporary bridge piers (for example, 22a and 22b), and the existing bridge girder 3 is supported by the intermediate frame 40. Good. In order to support the intermediate frame 40 on such a temporary pier, the intermediate frame 40 extends in the bridge width direction Y longer than the separation distance ΔY 2 of the temporary pier as indicated by reference numeral 40Y in FIG. It is necessary to have a part provided. As described above, when the separation distance ΔY 2 of the temporary pier is wider than the maximum width ΔY 1 , the space for removing the existing pier 2 and installing the new pier 12 below the existing bridge girder 3. Can be ensured sufficiently (see symbol S in FIG. 1B). Further, it is possible to stably supported by temporary piers wide intermediate frame 40 and the existing bridge girder 3 Span (reference [Delta] Y 3 in FIG. 1 (c)). In the example of FIG. 1 (c), two temporary piers arranged along the bridge width direction Y are arranged along the longitudinal direction X of the bridge, and these eight temporary piers 22a, One intermediate frame 40 is laid over each of the two temporary piers (for example, two temporary piers with reference numerals 22a and 22b, or two temporary piers with reference numerals 22c and 22d). Alternatively, separate intermediate frames may be bridged over two temporary piers labeled 22e and 22f, or two temporary piers labeled 22g and 22h.

図１(c)中に符号２２ａ，２２ｃ，２２ｅ，２２ｇ、及び符号２２ｂ，２２ｄ，２２ｆ，２２ｈで例示するように、橋梁幅方向Ｙに沿ってだけでなく橋梁長手方向Ｘにも沿うように仮設橋脚を複数本配置し、これら複数本の仮設橋脚（例えば、２２ａ，２２ｃ，２２ｅ，２２ｇ）に前記中間フレーム４０を架渡すようにしても良い。そのようにした場合には、２次元的に配置された複数本の仮設橋脚２２と中間フレーム４０とにより堅固な支持構造を構成でき、既設橋桁３をより安定的に支持することができる。     As illustrated by reference numerals 22a, 22c, 22e, and 22g and reference numerals 22b, 22d, 22f, and 22h in FIG. 1C, not only along the bridge width direction Y but also along the bridge longitudinal direction X. A plurality of temporary piers may be arranged, and the intermediate frame 40 may be bridged over the plurality of temporary piers (for example, 22a, 22c, 22e, 22g). In such a case, a solid support structure can be constituted by the plurality of temporary bridge piers 22 and the intermediate frame 40 which are two-dimensionally arranged, and the existing bridge girder 3 can be supported more stably.

かかる場合、中間フレーム４０は、孔部を有する形状（例えば、図１(c)に示すように、符号４０Ｘ及び４０Ｙを付した部分以外を孔部とした井桁形状）にすると良い。その場合には、既設橋桁３の安定的な支持を確保しつつ、中間フレーム４０を軽量化できる。なお、そのような孔部を有さない平板状の形状を、本発明の権利範囲から除外する趣旨では無い。また、この中間フレーム４０と既設橋桁３との間に補強用の支柱を介装しても良い。     In such a case, the intermediate frame 40 may have a shape having a hole (for example, as shown in FIG. 1 (c), a cross beam shape having holes other than the portions denoted by reference numerals 40X and 40Y). In that case, the intermediate frame 40 can be reduced in weight while ensuring stable support of the existing bridge girder 3. In addition, it is not the meaning which excludes the flat shape which does not have such a hole part from the scope of the right of this invention. Further, a reinforcing column may be interposed between the intermediate frame 40 and the existing bridge girder 3.

なお、中間フレームが上述のように井桁形状である場合、該中間フレーム４０と既設橋脚２との接続は公知の“ＰＣ・井桁締結方式”により行うと良い。この方式は、中間フレーム４０における一対の梁部分（図１(c)の場合には符号４０ｘ，４０ｘで示す梁部分）を各既設橋脚２を挟み込むように構築配置し、これら一対の梁部分４０ｘ，４０ｘの間にＰＣ鋼棒４０ａ，…を緊張した状態で架渡すことによって各梁部分４０ｘから各既設橋脚２の接触面に圧縮応力を作用させ、その圧縮応力によって中間フレーム４０と既設橋脚２との接続を行う方式である。なお、かかる方式以外の方式で中間フレーム４０と既設橋脚２とを接続するようにしても良い。     When the intermediate frame has a cross beam shape as described above, the connection between the intermediate frame 40 and the existing pier 2 may be performed by a known “PC / cross beam fastening method”. In this method, a pair of beam portions in the intermediate frame 40 (in the case of FIG. 1 (c), the beam portions indicated by reference numerals 40x and 40x) are constructed and arranged so as to sandwich each existing bridge pier 2, and the pair of beam portions 40x. , 40x, the PC steel rods 40a,... Are stretched between the beam portions 40x and the contact surfaces of the existing piers 2 to be compressed, and the intermediate frames 40 and the existing piers 2 are caused by the compressive stresses. It is a method to connect with. In addition, you may make it connect the intermediate | middle frame 40 and the existing pier 2 by systems other than this system.

図１(b)では、中間フレーム４０は、既設橋脚２の上部２ａに接続されているが、該既設橋脚上部２ａではなく既設橋桁３に直接接続しても良い。     In FIG. 1 (b), the intermediate frame 40 is connected to the upper part 2a of the existing pier 2 but may be directly connected to the existing bridge girder 3 instead of the existing pier upper part 2a.

なお、上述のような種々の効果が得られる点で中間フレームを使用することが好ましいが、中間フレームを使用しない実施態様、すなわち、
・ 中間フレームを介さずに、仮設橋脚２２と既設橋脚２とを直接連結する方法
・ 中間フレームを介さずに、仮設橋脚２２と既設橋桁３とを直接連結する方法
を本発明（請求項１に係る発明）の権利範囲から除外する趣旨では無い。 In addition, although it is preferable to use the intermediate frame in terms of obtaining various effects as described above, an embodiment in which the intermediate frame is not used, that is,
A method of directly connecting the temporary pier 22 and the existing pier 2 without using an intermediate frame. A method of directly connecting the temporary pier 22 and the existing bridge girder 3 without using an intermediate frame. It is not intended to be excluded from the scope of rights of such invention.

一方、既設橋脚２の切断、既設橋脚２の撤去、及び新設橋脚１２の構築は、種々の公知の方法で行えば良い。     On the other hand, cutting of the existing pier 2, removal of the existing pier 2, and construction of the new pier 12 may be performed by various known methods.

ところで、上述した横取り用ガイド装置３０は、既設橋桁３及び新設橋桁１３を移動させることができるものであれば、どのような構造であっても良い。最適なものとしては、図５(b)に示すように、既設橋桁３や新設橋桁１３を摺動させるための天板部材３１と、該天板部材３１を支持する多数の脚部３２と、により構成されたものを挙げることができる。     By the way, as long as the above-described guide device 30 for pre-emption can move the existing bridge girder 3 and the new bridge girder 13, any structure may be used. As an optimum one, as shown in FIG. 5 (b), a top plate member 31 for sliding the existing bridge girder 3 or the new bridge girder 13, and a number of legs 32 for supporting the top plate member 31; Can be mentioned.

横取り用ガイド装置３０は、既設橋桁３や新設橋桁１３を摺動させるように構成されているので、駆動手段としては、それらの橋桁３，１３に対して水平方向に駆動力を加えることができるようなもの（例えば、ジャッキ）を用いれば良く（図５(b)の符号３４参照）、クレーン等により橋桁３，１３を吊り下げたり持ち上げたりする必要は無い。それに伴って種々の効果を得ることができる。以下、その効果について説明する。     Since the horizontal guide apparatus 30 is configured to slide the existing bridge girder 3 and the new bridge girder 13, the driving means can apply a driving force to the bridge girders 3 and 13 in the horizontal direction. Such a thing (for example, a jack) may be used (see reference numeral 34 in FIG. 5B), and it is not necessary to suspend or lift the bridge girders 3 and 13 by a crane or the like. Accordingly, various effects can be obtained. Hereinafter, the effect will be described.

橋桁３，１３を吊り下げたり持ち上げたりする場合には大きな駆動力が必要となり、駆動手段が大型化して、広い設置スペースも必要となる。上述のように橋桁３，１３を摺動させるようにした場合には、駆動力も小さくて済み、駆動手段も小型のもので良く、設置スペースも広くなくて良い。例えば、天板部材３１にステンレス鋼を使用し、該天板部材３１と橋桁３又は１３との間に低摩擦部材（例えば、テフロン（登録商標）加工されたもの）３３を介装させた場合、駆動力は、被牽引物の重量の０．１％程度で済む。橋桁３，１３を吊り下げたり持ち上げたりする場合には、大きな駆動力が必要となり、１回に移動させることのできる橋桁の長さも制限を受けやすいが、本発明によれば、駆動力は小さくて済むので、そのような制限も受けにくい。     When the bridge girders 3 and 13 are suspended or lifted, a large driving force is required, the driving means is enlarged, and a large installation space is also required. When the bridge girders 3 and 13 are slid as described above, the driving force may be small, the driving means may be small, and the installation space may not be wide. For example, when stainless steel is used for the top plate member 31, and a low friction member (for example, Teflon (registered trademark) processed) 33 is interposed between the top plate member 31 and the bridge girder 3 or 13 The driving force may be about 0.1% of the weight of the towed object. When the bridge girders 3 and 13 are suspended or lifted, a large driving force is required, and the length of the bridge girder that can be moved at one time is also easily limited. However, according to the present invention, the driving force is small. So it ’s hard to get those restrictions.

ところで、図５(b)に示す例では、既設橋桁３の撤去に際しては、低摩擦部材３３は、既設橋脚２ａの下面（切断面）と天板部材３１との間に配置されているが、中間フレーム４０’と天板部材３１との間に配置しても良い。その場合の低摩擦部材３３，３３は、橋梁幅方向Ｙに出来るだけ離して配置すると、既設橋桁３を安定した状態で移動させることができる。     By the way, in the example shown in FIG. 5B, when the existing bridge girder 3 is removed, the low friction member 33 is disposed between the lower surface (cut surface) of the existing bridge pier 2a and the top plate member 31, You may arrange | position between intermediate frame 40 'and the top-plate member 31. FIG. In this case, if the low friction members 33 and 33 are arranged as far as possible in the bridge width direction Y, the existing bridge girder 3 can be moved in a stable state.

既設橋桁３の撤去のための移動は、図５(b)に例示するように、該既設橋桁３に中間フレーム４０を連結させた状態で行うと良い。その場合、中間フレーム４０により既設橋桁３が補強された状態となるので、橋梁長手方向に長い橋桁３であっても、撤去作業を安定的に行うことが出来る。そして、長い橋桁３を一度で撤去できるため、複数回に分けて撤去する場合に比べ、撤去作業時間を短縮でき、列車や車両の通行を休止する時間も短縮することができる。     The movement for removing the existing bridge girder 3 may be performed in a state where the intermediate frame 40 is connected to the existing bridge girder 3 as illustrated in FIG. In this case, since the existing bridge girder 3 is reinforced by the intermediate frame 40, even the bridge girder 3 that is long in the longitudinal direction of the bridge can be removed stably. And since the long bridge girder 3 can be removed at once, compared with the case where it removes in multiple times, removal work time can be shortened and the time which stops the passage of a train and a vehicle can also be shortened.

なお、既設橋桁３を移動させる前に該橋桁３から中間フレーム４０を取り外すようにしても良いが、その取り外し作業中は列車や車両の運行を休止させる必要が生じる場合もある。中間フレーム４０の取り外しを既設橋桁３の移動後に行うようにした場合には、列車や車両の通行を休止する時間を短縮することができる。     The intermediate frame 40 may be removed from the bridge girder 3 before the existing bridge girder 3 is moved, but it may be necessary to stop the operation of the train or the vehicle during the removal operation. When the removal of the intermediate frame 40 is performed after the existing bridge girder 3 is moved, the time for stopping the passage of the train or the vehicle can be shortened.

ところで、本発明における既設橋桁３は、撤去される直前までは列車や車両を通行させなければならないことから移動不可能な状態で定位置に固定されている必要があり、撤去される時は上述のように横取り用ガイド装置３０に沿って移動可能な状態にされている必要がある。以下、そのための工法の一例について詳述する。     By the way, the existing bridge girder 3 in the present invention must be fixed at a fixed position in a state where it cannot move because it must pass through a train or a vehicle until just before being removed. It is necessary to be able to move along the side guide device 30 as described above. Hereinafter, an example of the construction method will be described in detail.

上述した仮設橋脚２２のそれぞれの上面には高さ調整用ジャッキ２５を配置しておき、上述した井桁状の中間フレーム４０がそれらのジャッキ２５により持ち上げられた状態で仮設橋脚２２に載置されるようにしておく。この状態では、既設橋桁３は自らの重量で仮設橋脚２２にしっかりと（移動不可能な状態に）載置されることとなり、列車等を通行させることが可能となる。一方、上述のように横取り用ガイド装置３０を延設配置した後に該既設橋桁３を移動させるには、高さ調整用ジャッキ２５により既設橋桁３を持ち上げ、既設橋脚（符号２ａに示す部分）の下面と天板部材３１との間、或いは中間フレーム４０と天板部材３１との間に上述した低摩擦部材３３を配置し、高さ調整用ジャッキ２５を操作して既設橋桁３を下げて既設橋桁３及び中間フレーム４０の重量が該低摩擦部材３３によりガイド装置３０に支持されて前記仮設橋脚２２によっては支持されないような状態にする。その後、ジャッキ（横取り用のジャッキ）３４を駆動して既設橋桁３等を水平方向に移動させる。     The height adjusting jacks 25 are disposed on the upper surfaces of the temporary bridge piers 22 described above, and the above-described cross-girder-shaped intermediate frame 40 is placed on the temporary bridge piers 22 while being lifted by the jacks 25. Keep it like that. In this state, the existing bridge girder 3 is firmly placed on the temporary pier 22 with its own weight (in a state where it cannot move), and a train or the like can be passed. On the other hand, in order to move the existing bridge girder 3 after the sideways guide device 30 is extended and arranged as described above, the existing bridge girder 3 is lifted by the height adjusting jack 25 and the existing bridge pier (portion 2a) is moved. The above-described low friction member 33 is disposed between the lower surface and the top plate member 31 or between the intermediate frame 40 and the top plate member 31, and the existing bridge girder 3 is lowered by operating the height adjusting jack 25. The weight of the bridge girder 3 and the intermediate frame 40 is supported by the guide device 30 by the low friction member 33 and is not supported by the temporary bridge pier 22. Thereafter, the jack (jack for pre-emption) 34 is driven to move the existing bridge girder 3 and the like in the horizontal direction.

本発明は、鉄道や道路の橋梁を架け替える用途に使用することができる。     The present invention can be used for a purpose of replacing a railway or a road bridge.

図１(a)は、既設橋梁の近傍に仮設橋脚や中間フレームを配置した状態の一例を示す正面図であり、同図(b)は、そのＢ１矢視図であり、同図(c)は、(a)のＣ−Ｃ断面図である。1 (a) is a front view showing an example of a state of arranging the temporary piers and the intermediate frame in the vicinity of the existing bridges, Fig (b) is its B 1 arrow view, FIG. (C ) Is a cross-sectional view taken along the line CC of FIG. 図２(a)は、既設橋脚２の切断箇所等の一例を示す正面図であり、同図(b)は、そのＢ２矢視図である。2 (a) is a front view showing an example of such disconnection point of the existing piers 2, FIG. (B) is a B 2 arrow view. 図３(a)は、既設橋脚の切断後の様子の一例を示す正面図であり、同図(b)は、そのＢ３矢視図である。3 (a) is a front view showing an example of a state after cutting of the existing piers, FIG (b) is a B 3 arrow view. 図４(a)は、新設橋脚１２を構築した状態の一例を示す正面図であり、同図(b)は、そのＢ４矢視図である。4 (a) is a front view showing an example of a state in which to build a new bridge pier 12, FIG. (B) is a B 4 arrow view. 図５(a)は、新設橋桁を設置する様子の一例を示す正面図であり、同図(b)は、そのＢ５矢視図である。5 (a) is a front view showing an example of how to install the new bridge girder, FIG. (B) is a B 5 arrow view. 図６(a)は、既設橋梁１０１を支持するように仮設橋梁１２１を構築した状態を示す断面図であり、同図(b)は、既設橋桁１０３に縦孔１０３ａを穿設した状態を示す断面図であり、同図(c)は、枕木１０４を支持するように第２上部橋脚１２５等を配置した状態を示す断面図である。FIG. 6A is a cross-sectional view showing a state where the temporary bridge 121 is constructed so as to support the existing bridge 101, and FIG. 6B shows a state where the vertical hole 103a is formed in the existing bridge girder 103. FIG. 4C is a cross-sectional view showing a state in which the second upper pier 125 and the like are arranged so as to support the sleepers 104. 図７(a)は、撤去しようとする既設橋梁１０１を斜線で示した断面図であり、同図(b)は、該既設橋梁１０１を撤去した状態を示す断面図であり、同図(c)は、新設橋梁１１１を構築した状態を示す断面図である。FIG. 7 (a) is a cross-sectional view showing the existing bridge 101 to be removed with diagonal lines, and FIG. 7 (b) is a cross-sectional view showing the state where the existing bridge 101 is removed. ) Is a cross-sectional view showing a state where the new bridge 111 is constructed.

符号の説明Explanation of symbols

１ 既設橋梁
２ 既設橋脚
３ 既設橋桁
１１ 新設橋梁
１２ 新設橋脚
１３ 新設橋桁
２２ 仮設橋脚
４０ 中間フレーム
Ｓ 空間
Ｘ 橋梁長手方向
Ｙ 橋梁幅方向 1 Existing bridge 2 Existing bridge pier 3 Existing bridge girder 11 New bridge 12 New bridge pier 13 New bridge girder 22 Temporary pier 40 Intermediate frame S Space X Bridge longitudinal direction Y Bridge width direction

Claims (4)

既設橋脚と既設橋桁とからなる既設橋梁を、新設橋脚と新設橋桁とからなる新設橋梁に架け替えるための橋梁架替工法において、
各既設橋脚の近傍に仮設橋脚を構築する工程と、
該構築した仮設橋脚に前記既設橋桁を支持させる工程と、
前記仮設橋脚に支持された部分よりも下方にて前記既設橋脚を切断する工程と、
該切断された部分より下側の既設橋脚を撤去する工程と、
前記既設橋桁の下方の空間に新設橋脚を構築する工程と、
前記既設橋桁の下方の空間を橋梁幅方向に通り抜けるように横取り用ガイド装置を延設配置する工程と、
前記既設橋桁を該横取り用ガイド装置で支持した形で一体的に移動させることにより撤去する工程と、
前記新設橋桁を、前記横取り用ガイド装置で支持した形で移動させて前記新設橋脚の上方に設置する工程と、
を有することを特徴とする橋梁架替工法。 In the bridge replacement method to replace an existing bridge consisting of an existing pier and an existing bridge girder with a new bridge consisting of a new pier and a new bridge girder,
Building a temporary pier in the vicinity of each existing pier;
Supporting the existing bridge girder on the constructed temporary pier;
Cutting the existing pier below the portion supported by the temporary pier, and
Removing the existing pier below the cut portion;
Building a new pier in the space below the existing bridge girder;
Extending and arranging a side guide device so as to pass through the space below the existing bridge girder in the bridge width direction;
Removing the existing bridge girder by integrally moving in a form supported by the side guide device;
Moving the new bridge girder in a form supported by the side guide device and installing it above the new bridge pier;
Bridge replacement method characterized by having 前記仮設橋脚を、橋梁幅方向に沿って少なくとも２本、前記既設橋脚が設置されている最大幅よりも広い離間距離で配置し、
これら２本の仮設橋脚に中間フレームを架渡し、
該中間フレームに前記既設橋桁を支持させる、
ことを特徴とする請求項１に記載の橋梁架替工法。 The temporary piers are arranged at a separation distance wider than the maximum width at which the existing piers are installed, at least two along the bridge width direction,
Intermediate frame between these two temporary piers,
Supporting the existing bridge girder on the intermediate frame;
The bridge replacement method according to claim 1, wherein: 前記仮設橋脚を、橋梁長手方向に沿って複数本配置し、
これら複数本の仮設橋脚に前記中間フレームを架渡した、
ことを特徴とする請求項２に記載の橋梁架替工法。 A plurality of the temporary piers are arranged along the longitudinal direction of the bridge,
The intermediate frame was bridged over these multiple temporary piers,
The bridge replacement method according to claim 2, wherein: 前記既設橋桁の撤去のための移動は、前記中間フレームを該既設橋桁に連結させた状態で行う、
ことを特徴とする請求項２又は３に記載の橋梁架替工法。

The movement for removing the existing bridge girder is performed with the intermediate frame connected to the existing bridge girder.
The bridge replacement method according to claim 2 or 3, characterized in that

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