JP6720761B2 - How to build a ramen structure - Google Patents

How to build a ramen structure Download PDF

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JP6720761B2
JP6720761B2 JP2016153778A JP2016153778A JP6720761B2 JP 6720761 B2 JP6720761 B2 JP 6720761B2 JP 2016153778 A JP2016153778 A JP 2016153778A JP 2016153778 A JP2016153778 A JP 2016153778A JP 6720761 B2 JP6720761 B2 JP 6720761B2
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joint portion
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precast concrete
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JP2018021394A (en
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直人 藤生
直人 藤生
健佑 叶
健佑 叶
直之 喜多
直之 喜多
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Obayashi Corp
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Description

本発明は、ラーメン構造を構築する方法に関する。 The present invention relates to a method of constructing a ramen structure.

特許文献1には、隣り合う柱の上端部間に梁をプレキャスト工法により構築する技術が開示されている。以下、特許文献1で用いられた符号を括弧書きで表記し、特許文献1に記載の技術について簡単に説明する。
特許文献1に記載の方法では、まず、PC柱(4−1)の上部に仕口パネル部材(3)を設置し、鉄筋(4a)を仕口パネル部材(3)の上から仕口パネル部材(3)に貫通させて、鉄筋(4a)の下部をPC柱(4−1)の上部の柱主筋用継手(4c)に定着する。これにより、PC柱(4−1)と仕口パネル部材(3)を接合する。
次に、PC梁(1)をその一端が仕口パネル部材(3)の側面に向くように横方向に移動させ、PC梁(1)の一端から突出する梁主筋(1a)を仕口パネル部材(3)の側面の梁主筋孔(3a)に挿入する。
次に、隣りの仕口パネル部材(3)の側面をPC梁(1)の他端に向けて横方向に移動させ、仕口パネル部材(3)を隣りのPC柱(4−2)の上部に設置する。そして、鉄筋(4a)を仕口パネル部材(3)の上方から下方へ貫通させて、鉄筋(4a)の下部をPC柱(4−2)の上部の柱主筋用継手(4c)に定着する。これにより、PC柱(4−2)と仕口パネル部材(3)を接合する。
Patent Document 1 discloses a technique of constructing a beam between the upper ends of adjacent columns by a precast method. Hereinafter, the reference numerals used in Patent Document 1 will be written in parentheses, and the technique described in Patent Document 1 will be briefly described.
In the method described in Patent Document 1, first, a connection panel member (3) is installed on an upper portion of a PC column (4-1), and a reinforcing bar (4a) is placed on the connection panel member (3) from the connection panel member (3). The lower part of the reinforcing bar (4a) is fixed to the column main bar joint (4c) above the PC column (4-1) by penetrating the member (3). This joins the PC column (4-1) and the connection panel member (3).
Next, the PC beam (1) is laterally moved so that one end thereof faces the side surface of the connector panel member (3), and the beam main bar (1a) protruding from one end of the PC beam (1) is connected to the connector panel. The member (3) is inserted into the main beam hole (3a) on the side surface.
Next, the side surface of the adjacent joint panel member (3) is moved laterally toward the other end of the PC beam (1) to move the joint panel member (3) to the adjacent PC column (4-2). Install on top. Then, the reinforcing bar (4a) is penetrated downward from above the connector panel member (3) to fix the lower part of the reinforcing bar (4a) to the column main bar joint (4c) above the PC column (4-2). .. As a result, the PC column (4-2) and the connection panel member (3) are joined.

特開2004−278257号公報JP 2004-278257 A

ところで、特許文献1に記載の技術を鉄道等の高架橋のラーメン構造の構築に適用することが考えられる。しかし、高架橋においては、地震時等に仕口パネル部材(3)の表層部分の被りコンクリートが脱落するのを防止するべく、仕口パネル部材(3)とPC柱(4)とを接続する鉄筋(4a)の上端部をU字型のフック状にする必要がある。このように鉄筋(4a)の上端部をU字型とすると、仕口パネル部材(3)の上に配筋される他の鉄筋(例えばスラブ筋、梁主筋等)に干渉して、仕口パネル部材(3)の上方から鉄筋(4a)を挿入することができない。従って、仕口パネル部材(3)の作製時に予め鉄筋(4a)を設けておく必要があり、特許文献1に記載の技術をそのまま高架橋のラーメン構造の構築に応用することができない。 By the way, it is possible to apply the technique described in Patent Document 1 to the construction of a viaduct rigid frame structure such as a railway. However, in viaducts, in order to prevent the cover concrete on the surface layer of the joint panel member (3) from falling off in the event of an earthquake, etc., a reinforcing bar connecting the joint panel member (3) and the PC column (4). It is necessary to make the upper end of (4a) into a U-shaped hook shape. When the upper end portion of the reinforcing bar (4a) is U-shaped in this way, it interferes with other reinforcing bars (for example, slab reinforcing bars, beam main reinforcing bars) arranged on the connector panel member (3), The reinforcing bar (4a) cannot be inserted from above the panel member (3). Therefore, it is necessary to previously provide the reinforcing bar (4a) at the time of producing the connection panel member (3), and the technique described in Patent Document 1 cannot be directly applied to the construction of the viaduct rigid frame structure.

本発明は、上記事情に鑑みてなされたものであり、本発明が解決しようとする課題は、高架橋のラーメン構造を構築するにあたり、鉄筋を仕口部にその上方から貫通させることなく、仕口部と柱とを接合できるようにすることである。 The present invention has been made in view of the above circumstances, and a problem to be solved by the present invention is to construct a viaduct ramen structure without passing the reinforcing bar from above the joint to the joint. It is to be able to join the part and the pillar.

以上の課題を解決するための発明は、高架橋のラーメン構造を構築する方法において、複数本の柱を間隔を置いて立設する工程と、複数のプレキャストコンクリート部材を前記柱の配列方向に配列するよう前記柱の上方に揚重し、前記プレキャストコンクリート部材を接続することによって、前記柱に対応する複数の仕口部とそれら仕口部を接続する横梁とを有する接続体を形成し、前記接続体の仕口部を前記柱の上方に配置し、前記接続体の横梁を前記柱の上方の前記柱間に配置する接続工程と、前記接続工程を行った後に、前記接続体を下降させて、前記仕口部の下端部と前記柱の上端部のうち一方から突出した主筋を他方に設けられたスリーブ継手に挿入する下降工程と、を備えることを特徴とするラーメン構造の構築方法ある。 The invention for solving the above problems, in a method of constructing a viaduct rigid frame structure, a step of standing up a plurality of columns at intervals, a plurality of precast concrete members are arranged in the arrangement direction of the columns As such, by lifting above the pillar, by connecting the precast concrete member, to form a connector having a plurality of joints corresponding to the pillar and a cross beam connecting the joints, the connection A connecting step of arranging the body part above the pillar and arranging the cross beam of the connecting body between the pillars above the pillar, and lowering the connecting body after performing the connecting step. And a lowering step of inserting a main bar projecting from one of a lower end portion of the joint portion and an upper end portion of the column into a sleeve joint provided on the other side, the method of constructing a rigid frame structure.

以上の発明によれば、複数のプレキャストコンクリート部材を柱の上方に揚重するので、これらプレキャストコンクリート部材を接続する際に、仕口部の下端部と柱の上端部とのうち一方から延出した主筋が他方に干渉しないようにすることできる。つまり、その主筋が仕口部又は柱に予め設けられた状態でも、複数のプレキャストコンクリート部材を接続することができる。そして、その後の下降工程でプレキャストコンクリート部材の接続体を下降させて、主筋をスリーブ継手に挿入するので、柱の上への仕口部の設置後に鉄筋を仕口部の上から仕口部に貫通させる作業を必要としない。 According to the above invention, since a plurality of precast concrete members are lifted above the pillar, when connecting these precast concrete members, extend from one of the lower end of the joint portion and the upper end of the pillar. It is possible to prevent one main line from interfering with the other. That is, a plurality of precast concrete members can be connected even in the state where the main bars are provided in advance in the joint portion or the pillar. Then, in the subsequent descending step, the connecting body of the precast concrete member is lowered and the main bar is inserted into the sleeve joint, so after installing the joint part on the pillar, the rebar is moved from above the joint part to the joint part. No work to penetrate is required.

好ましくは、前記接続工程では、前記柱の側面に設置された基台上に駒台を複数段に設置するとともに、架台を前記柱間に掛け渡すように前記駒台上に設置した上で、前記接続体を前記架台上に設置し、前記下降工程では、前記基台上に設置したジャッキによって前記架台及び前記接続体を支持した状態で、前記駒台を一段ずつ取り外しながら前記ジャッキにより前記架台及び前記接続体を下降させる。 Preferably, in the connecting step, a piece stand is installed in a plurality of stages on a base installed on a side surface of the pillar, and a pedestal is installed on the piece stand so as to be bridged between the pillars, The connecting body is installed on the pedestal, and in the lowering step, the pedestal and the connecting body are supported by a jack installed on the base, and the pedestal is mounted by the jack while removing the bridge one by one. And lowering the connection body.

以上によれば、架台を柱間に掛け渡すように駒台上に設置したので、複数のプレキャストコンクリート部材をクレーン等の揚重機によって順次揚重して、架台に設置することができる。また、プレキャストコンクリート部材を架台で支持しながら、プレキャストコンクリート部材を接続することができる。よって、揚重機の最大揚重能力が低くても済む。
駒台を一段ずつ取り外しながらジャッキにより架台及びプレキャストコンクリート部材の接続体を下降させるので、プレキャストコンクリート部材の接続体の姿勢が安定し、主筋をスリーブ継手にしやすい。
According to the above, since the gantry is installed on the bridge so as to be bridged between the pillars, a plurality of precast concrete members can be sequentially hoisted by a hoist such as a crane and installed on the gantry. Further, the precast concrete members can be connected while the precast concrete members are supported by the gantry. Therefore, the maximum lifting capacity of the lifting machine is low.
Since the connecting body of the pedestal and the precast concrete member is lowered by the jack while removing the bridges one by one, the posture of the connecting body of the precast concrete member is stable, and the main bar is easily a sleeve joint.

好ましくは、前記柱の数が2本であり、前記プレキャストコンクリート部材のうち両側の第一プレキャストコンクリート部材は、前記仕口部と、前記仕口部から延出した梁部とを有し、前記接続工程では、前記プレキャストコンクリート部材のうち前記第一プレキャストコンクリート部材の間の第二プレキャストコンクリート部材を前記梁部間に接続する。 Preferably, the number of the columns is two, the first precast concrete members on both sides of the precast concrete member have the joint portion and a beam portion extending from the joint portion, In the connecting step, a second precast concrete member between the first precast concrete members among the precast concrete members is connected between the beam portions.

好ましくは、前記柱の数が2本であり、前記プレキャストコンクリート部材の数が2体であり、前記プレキャストコンクリート部材は、前記仕口部と、前記仕口部から延出した梁部とを有し、前記接続工程では、前記プレキャストコンクリート部材の前記梁部同士を接続する。 Preferably, the number of the pillars is 2, the number of the precast concrete members is 2, and the precast concrete member has the joint portion and a beam portion extending from the joint portion. Then, in the connecting step, the beam portions of the precast concrete member are connected to each other.

好ましくは、前記構築方法は、前記下降工程後に、前記スリーブ継手にグラウトを充填するとともに、前記仕口部の下端面と前記柱の上端面との間にグラウトを充填するグラウト充填工程を更に備える。 Preferably, the construction method further comprises a grout filling step of filling the sleeve joint with grout after the lowering step and filling the grout between the lower end surface of the joint portion and the upper end surface of the column. ..

本発明によれば、鉄筋を仕口部の上から仕口部に貫通させることなく、仕口部と柱を接合できる。 ADVANTAGE OF THE INVENTION According to this invention, a connection part and a pillar can be joined, without making a reinforcing bar penetrate through a connection part from a connection part.

図1は、高架橋のラーメン構造の斜視図である。FIG. 1 is a perspective view of a viaduct rigid frame structure. 図2は、ラーメン構造の構築方法の一工程を示した斜視図である。FIG. 2 is a perspective view showing one step of a method for constructing a ramen structure. 図3は、図2に示す工程の後の工程を説明するため斜視図である。FIG. 3 is a perspective view for explaining a step after the step shown in FIG. 図4は、図3に示す工程の後の工程を説明するため斜視図である。FIG. 4 is a perspective view for explaining a step after the step shown in FIG. 図5は、図3及び図4に示す工程の中の一工程を説明するための正面図である。FIG. 5 is a front view for explaining one of the steps shown in FIGS. 3 and 4. 図6は、図5に示す矢印Aの方向に見て示した拡大側面図である。FIG. 6 is an enlarged side view shown in the direction of arrow A shown in FIG. 図7は、図5に示す工程の後の工程を説明するための正面図である。FIG. 7 is a front view for explaining a step after the step shown in FIG. 図8は、図7に示す矢印Aの方向に見て示した拡大側面図である。8 is an enlarged side view shown in the direction of arrow A shown in FIG. 図9は、図7に示す工程の後の工程を説明するための正面図である。FIG. 9 is a front view for explaining a step after the step shown in FIG. 7. 図10は、図4や図9に示す工程の後の工程を説明するための斜視図である。FIG. 10 is a perspective view for explaining a step after the step shown in FIGS. 4 and 9. 図11は、図10に示す工程の中の一工程を示した拡大側面図である。FIG. 11 is an enlarged side view showing one of the steps shown in FIG. 図12は、図11に示す工程の後の工程を説明するための正面図である。FIG. 12 is a front view for explaining a step after the step shown in FIG. 図13は、図12に示す矢印Aの方向に見て示した拡大側面図である。FIG. 13 is an enlarged side view shown in the direction of arrow A shown in FIG. 図14は、図12に示す工程の後の工程を説明するための正面図である。FIG. 14 is a front view for explaining a step after the step shown in FIG. 図15は、図14に示す矢印Aの方向に見て示した拡大側面図である。FIG. 15 is an enlarged side view shown in the direction of arrow A shown in FIG. 図16は、図14に示す工程の後の工程を説明するための正面図である。FIG. 16 is a front view for explaining a step after the step shown in FIG. 図17は、図16に示す矢印Aの方向に見て示した拡大側面図である。17 is an enlarged side view shown in the direction of arrow A shown in FIG. 図18は、図16に示す工程の後の工程を説明するための正面図である。FIG. 18 is a front view for explaining a step after the step shown in FIG. 図19は、図18に示す矢印Aの方向に見て示した拡大側面図である。FIG. 19 is an enlarged side view shown in the direction of arrow A shown in FIG. 図20は、図18に示す工程の後の工程を説明するための正面図である。FIG. 20 is a front view for explaining a step after the step shown in FIG. 図21は、図10や図20に示す工程の後の工程を説明するための斜視図である。FIG. 21 is a perspective view for explaining a step after the step shown in FIGS. 図22は、図21に示す工程の後の工程を説明するための斜視図である。FIG. 22 is a perspective view for explaining a step after the step shown in FIG. 図23は、図22に示す工程の後の工程を説明するための斜視図である。FIG. 23 is a perspective view for explaining a step after the step shown in FIG. 図24は、図23に示す工程の後の工程を説明するための斜視図である。FIG. 24 is a perspective view for explaining a step after the step shown in FIG. 図25は、図24に示す工程の後の工程を説明するための斜視図である。FIG. 25 is a perspective view for explaining a step after the step shown in FIG. 図26は、図25に示す工程の後の工程を説明するための斜視図である。FIG. 26 is a perspective view for explaining a step after the step shown in FIG. 図27は、図26に示す工程の後の工程を説明するための斜視図である。27 is a perspective view for explaining a step after the step shown in FIG. 図28は、変形例に係るラーメン構造の構築方法の一工程における柱上部を示した正面拡大図である。FIG. 28 is an enlarged front view showing the pillar upper part in one step of the method for constructing the rigid frame structure according to the modification. 図29は、別の変形例に係るラーメン構造を示した正面図である。FIG. 29 is a front view showing a ramen structure according to another modification. 図30は、図29に示すラーメン構造の構築方法の一工程を示した正面図である。FIG. 30 is a front view showing one step of the method for constructing the ramen structure shown in FIG. 図31は、別の変形例に係るラーメン構造の構築方法の一工程を示した正面図である。FIG. 31: is a front view which showed 1 process of the construction method of the ramen structure which concerns on another modification. 図32は、別の変形例に係るラーメン構造の構築方法の一工程を示した正面図である。FIG. 32 is a front view showing one step of a method for constructing a rigid frame structure according to another modification. 図33は、別の変形例に係るラーメン構造の構築方法の一工程を示した正面図である。FIG. 33 is a front view showing one step of a method for constructing a rigid frame structure according to another modification. 図34は、一対の仕口部及び横梁を有する接続体の構成要素となるプレキャストコンクリート部材の各種の形態を示した概略図正面図である。FIG. 34 is a schematic front view showing various forms of a precast concrete member which is a constituent element of a connector having a pair of joints and a lateral beam.

以下、図面を参照して、本発明の実施形態について説明する。但し、以下に述べる実施形態には、本発明を実施するために技術的に好ましい種々の限定が付されているが、本発明の範囲を以下の実施形態及び図示例に限定するものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

1. 鉄道高架橋のラーメン構造の構成
図1は、鉄道高架橋のラーメン構造1の一部分を示した斜視図である。このラーメン構造は、プレキャスト工法により構築されたものである。
1. Configuration of Ramen Structure of Railway Viaduct FIG. 1 is a perspective view showing a part of a ramen structure 1 of a railway viaduct. This ramen structure is constructed by the precast method.

図1に示すように、ラーメン構造1は、橋軸方向に所定間隔を置いて配列された複数の門形ラーメン構造5,5…と、最前列のラーメン構造5から橋軸方向に所定間隔を置いて配置された門形ラーメン構造2と、門形ラーメン構造2,5,5…の隣り同士の間に架設された縦梁8とを備える。門形ラーメン構造2は、ラーメン構造1の橋軸方向端部に設けられる門形ラーメン構造である。 As shown in FIG. 1, the ramen structure 1 includes a plurality of portal-shaped ramen structures 5, 5... Arranged at predetermined intervals in the bridge axis direction, and a predetermined interval in the bridge axis direction from the front row ramen structure 5. The portal frame structure 2 is placed side by side, and the vertical beam 8 is installed between adjacent gate frame structures 2, 5, 5... The portal rigid frame structure 2 is a portal rigid frame structure provided at an end portion of the rigid frame structure 1 in the bridge axial direction.

門形ラーメン構造2は、橋幅方向に間隔を置いた状態で地中の基礎上に立設された2本の柱20,20と、これら柱20,20の上端間に架設された横梁30と、を有する。門形ラーメン構造5も同様に、橋幅方向に間隔を置いた状態で地中の基礎上に立設された2本の柱50,50と、これら柱50,50の上端間に架設された横梁60と、を有する。 The gate-shaped rigid frame structure 2 includes two columns 20 and 20 which are erected on a foundation in the ground with a space in the bridge width direction, and a cross beam 30 which is erected between the upper ends of these columns 20 and 20. And. Similarly, the gate-shaped rigid frame structure 5 is installed between two pillars 50 and 50, which are erected on the foundation in the ground with a space in the bridge width direction, and the upper ends of these pillars 50 and 50. And a cross beam 60.

門形ラーメン構造2とその隣りの門形ラーメン構造5との間には2本の縦梁8が設けられている。具体的には、これら縦梁8は、柱20と横梁30の仕口部40と、柱50と横梁60の仕口部70との間に架設されている。
隣合う門形ラーメン構造5,5の間にも2本の縦梁8が設けられている。具体的には、これら縦梁8は、隣り合う門形ラーメン構造5の仕口部70の間に架設されている。
従って、柱20,50,50…が橋軸方向に所定間隔を置いた状態で2列に配列され、縦梁8が柱20,50,50…の橋軸方向隣り同士の上端間に架設されていることになる。
仕口部40,70の上面には、複数の鉄筋が突出しており、これら鉄筋の突き出た部分は、U字型に折り返されてフック状に設けられている。
なお、縦梁8、横梁30及び横梁60によって囲まれた領域を塞ぐように、スラブが縦梁8、横梁30、横梁60、仕口部40及び仕口部70上に設けられる。
Two vertical beams 8 are provided between the gate-shaped rigid frame structure 2 and the adjacent gate-shaped rigid frame structure 5. Specifically, these vertical beams 8 are installed between the joints 40 of the columns 20 and the transverse beams 30 and the joints 70 of the columns 50 and the transverse beams 60.
Two vertical beams 8 are also provided between the adjacent gate-shaped ramen structures 5 and 5. Specifically, these vertical beams 8 are installed between the joints 70 of the adjacent portal-shaped ramen structures 5.
Therefore, the columns 20, 50, 50... Are arranged in two rows with a predetermined interval in the bridge axis direction, and the vertical beams 8 are installed between the upper ends of the columns 20, 50, 50. Will be.
A plurality of reinforcing bars are projected on the upper surfaces of the connecting portions 40, 70, and the protruding parts of these reinforcing bars are folded back in a U shape to be provided in a hook shape.
A slab is provided on the vertical beam 8, the horizontal beam 30, the horizontal beam 60, the joint portion 40, and the joint portion 70 so as to close the region surrounded by the vertical beam 8, the transverse beam 30, and the transverse beam 60.

2. 鉄道高架橋のラーメン構造の構築方法
以下に、ラーメン構造1の構築方法について説明する。
2. Construction method of ramen structure of railway viaduct Hereinafter, a construction method of the ramen structure 1 will be described.

(1)門形ラーメン構造2,5の柱20,50の施工工程
図2に示すように、門形ラーメン構造2の柱20,20を組み立てる。具体的には、柱用プレキャストコンクリート部材(以下、「プレキャストコンクリート」を「PC」と略記する。)21の下端を基礎に接合し、柱用PC部材21の上端に柱用PC部材22の下端を接合する。
ここで、柱用PC部材22の下端面から複数の主筋が突出している。一方、柱用PC部材21の上端部には、柱用PC部材21の主筋に接続された筒状のスリーブ継手が埋設されており、柱用PC部材22の下端面から突出する主筋を柱用PC部材21のスリーブ継手に挿入した上で、スリーブ継手の内部にグラウトを充填するとともに、柱用PC部材21の上端面と柱用PC部材22の下端面との間の隙間にグラウトを充填する。そして、柱用PC部材21のスリーブ継手に充填されたグラウトが硬化することによって、柱用PC部材21、22が接合される。
(1) Construction process of the columns 20 and 50 of the portal frame structure 2 and 5 As shown in FIG. 2, the columns 20 and 20 of the portal frame structure 2 are assembled. Specifically, the lower end of a pillar precast concrete member (hereinafter, "precast concrete" is abbreviated as "PC") 21 is joined to a foundation, and the upper end of the pillar PC member 21 is connected to the lower end of the pillar PC member 22. To join.
Here, a plurality of main bars project from the lower end surface of the column PC member 22. On the other hand, a cylindrical sleeve joint connected to the main bar of the column PC member 21 is embedded in the upper end of the column PC member 21, and the main bar protruding from the lower end surface of the column PC member 22 is used for the column. After being inserted into the sleeve joint of the PC member 21, the inside of the sleeve joint is filled with grout, and the gap between the upper end surface of the pillar PC member 21 and the lower end surface of the pillar PC member 22 is filled with grout. .. Then, by curing the grout filled in the sleeve joint of the column PC member 21, the column PC members 21 and 22 are joined.

門形ラーメン構造5の柱50,50も、門形ラーメン構造2の柱20と同様に、柱用PC部材51,52を接合することにより構築されている。
これら柱20,50,50…の施工は、例えば、橋軸方向の一端側から他端側に向かう順で行うことが好ましい。
The columns 50, 50 of the portal frame structure 5 are also constructed by joining the column PC members 51, 52 in the same manner as the columns 20 of the portal frame structure 2.
It is preferable to perform the construction of these columns 20, 50, 50... In the order from one end side to the other end side in the bridge axis direction.

なお、上側の柱用PC部材22,52の上端部にも、柱用PC部材22,52の主筋に接続された筒状のスリーブ継手23,53が埋設されている。 In addition, tubular sleeve joints 23 and 53 connected to the main bars of the column PC members 22 and 52 are also embedded in the upper ends of the upper column PC members 22 and 52.

(2)門形ラーメン構造2の横梁30及び仕口部40の施工工程
図3に示すようにクレーン等によって第一PC部材31、第二PC部材32及び第一PC部材31をこれらの順に柱20の上端面よりも高い位置まで揚重し、図4に示すようにこれらPC部材31,32,31を橋幅方向に近接するように移動させることにより横梁30及び仕口部40を一体化して構築するが、その詳細は後述する。
(2) Process for constructing the transverse beam 30 and the joint 40 of the portal frame structure 2 As shown in FIG. 3, the first PC member 31, the second PC member 32, and the first PC member 31 are pillared in this order by a crane or the like. 20 is lifted to a position higher than the upper end surface and the PC members 31, 32, 31 are moved closer to each other in the bridge width direction as shown in FIG. Will be constructed, but the details will be described later.

図3に示すように、PC部材31は、仕口部31aと、仕口部31aから橋幅方向に延出した梁部31bと、を有する。仕口部31aは完成後の仕口部40に相当し、梁部31bは完成後の横梁30の端部に相当する。仕口部31aの下面から複数の柱主筋31cが下向きに突出し、仕口部31aの橋軸方向に向いた面から縦梁主筋31eが橋軸方向に突出し、梁部31bの端面から複数の横梁主筋31dが橋幅方向に突出している。また、PC部材32は完成後の横梁30の中央部に相当し、PC部材32の両端部には、スリーブ継手32aが埋設されている。なお、図3に示す例では、一方のPC部材31の梁部31bと他方のPC部材31の梁部31bとは長さが等しいが、これに限らず、これらの長さが異なってもよい。 As shown in FIG. 3, the PC member 31 has a joint portion 31a and a beam portion 31b extending from the joint portion 31a in the bridge width direction. The joint portion 31a corresponds to the completed joint portion 40, and the beam portion 31b corresponds to the end portion of the completed horizontal beam 30. A plurality of pillar main reinforcements 31c project downward from the lower surface of the joint portion 31a, a vertical beam main reinforcement 31e protrudes in the bridge axis direction from the surface of the joint portion 31a that faces the bridge axis direction, and a plurality of horizontal beams from the end surface of the beam portion 31b. The main bar 31d projects in the bridge width direction. The PC member 32 corresponds to the center of the completed horizontal beam 30, and sleeve joints 32a are embedded at both ends of the PC member 32. In the example shown in FIG. 3, the beam portion 31b of the one PC member 31 and the beam portion 31b of the other PC member 31 have the same length, but the length is not limited to this and may be different. ..

このようなPC部材31,32,31を柱20の上端面よりも高い位置まで揚重するので、これらPC部材31,32,31を橋幅方向に接続する際に、PC部材31の仕口部31aの下面から突出した柱主筋31cが柱20に干渉しない。 Since such PC members 31, 32, 31 are lifted to a position higher than the upper end surface of the column 20, when connecting these PC members 31, 32, 31 in the bridge width direction, the joint of the PC member 31 The column main bars 31c protruding from the lower surface of the portion 31a do not interfere with the column 20.

以下、第一PC部材31,第二PC部材32及び第一PC部材31から横梁30及び仕口部40を構築する工程について、図5〜図9を参照して詳細に説明する。図5、図7及び図9は橋軸方向に向かって見た正面図であり、図6及び図8は矢印Aの方向に向かって見た柱20の上部の拡大側面図である。図5、図7及び図9において、2点鎖線で示される作業足場29は、柱20の施工の際に柱20を取り囲むように設置されたものである。なお、以下において、横梁30の両端を構成する一対の第一PC部材31,31を区別する場合は、第一PC部材31A、第一PC部材31Bと称し、また、一対の柱20,20を区別する場合は、第一PC部材31A側の柱20を柱20Aと称し、第一PC部材31B側の柱20を柱20Bと称するものとする。 Hereinafter, a process of constructing the cross beam 30 and the joint portion 40 from the first PC member 31, the second PC member 32, and the first PC member 31 will be described in detail with reference to FIGS. 5 to 9. 5, 7 and 9 are front views seen in the bridge axis direction, and FIGS. 6 and 8 are enlarged side views of the upper part of the column 20 seen in the direction of arrow A. In FIGS. 5, 7, and 9, the work scaffold 29 indicated by a chain double-dashed line is installed so as to surround the pillar 20 when the pillar 20 is constructed. In addition, below, when distinguishing a pair of 1st PC members 31 and 31 which comprise both ends of the horizontal beam 30, it calls a 1st PC member 31A and a 1st PC member 31B, and also a pair of pillars 20 and 20. When distinguishing, the pillar 20 on the first PC member 31A side is referred to as a pillar 20A, and the pillar 20 on the first PC member 31B side is referred to as a pillar 20B.

(2−1)架台90の設置
図5及び図6に示すように、門形ラーメン構造2を構成する両側の柱20A,20Bの間隔より短いH形鋼からなる架台90を、柱20A,20Bの間にそれらの上端面よりも高い位置に設置する。具体的には、両側の柱20A,20Bの上部に基台91、駒台92及び下部架台93を取り付けた上で、架台90を両側の柱20の下部架台93間に架け渡すようにして下部架台93上に組み付ける。ここで、形鋼からなる基台91を柱20A,20Bの上部の側面(橋幅方向に互いに対向する面)にボルトによって固定し、H形鋼からなる駒台92を基台91の上に2列且つ複数段に積み上げるようにボルトによって固定し、H形鋼からなる下部架台93を最上段の駒台92間に掛け渡すようにして最上段の駒台92上にボルトによって固定する。
(2-1) Installation of the gantry 90 As shown in FIGS. 5 and 6, the gantry 90 made of H-shaped steel shorter than the interval between the columns 20A and 20B on both sides of the portal-shaped rigid frame structure 2 is attached to the columns 20A and 20B. Between them and higher than their top surfaces. Specifically, the base 91, the piece base 92, and the lower mount 93 are attached to the upper parts of the pillars 20A and 20B on both sides, and then the mount 90 is bridged between the lower mounts 93 of the pillars 20 on both sides. Assemble on the pedestal 93. Here, the base 91 made of shaped steel is fixed to the upper side surfaces (surfaces facing each other in the bridge width direction) of the columns 20A and 20B by bolts, and the piece base 92 made of H-shaped steel is placed on the base 91. It is fixed by bolts so as to be stacked in two rows and a plurality of stages, and a lower pedestal 93 made of H-shaped steel is bridged between the uppermost piece bases 92 and fixed on the uppermost piece bases 92 by bolts.

(2−2)ジャッキ99の設置
図6に示すように、基台91上に駒台97を設置した上で、下部架台93及び架台90を下から支持するためのジャッキ99を駒台97上に設置する。ジャッキ99は例えば油圧式のジャッキである。
(2-2) Installation of Jack 99 As shown in FIG. 6, after installing the piece base 97 on the base 91, the jack 99 for supporting the lower mount 93 and the mount 90 from below is mounted on the piece base 97. To install. The jack 99 is, for example, a hydraulic jack.

(2−3)PC部材31A,32,31Bの揚重及び仮組
図7及び図8に示すように、一方のPC部材31Aをクレーン等によって一方の柱20Aの上方に揚重して、PC部材31Aの仕口部31aの下端面から突出する主筋31cが柱20Aと干渉しないように柱20Aの上端面から離間させた状態で、PC部材31Aを架台90上に上部架台94を介して仮設置する。この際、仕口部31aの下端面から突出した柱主筋31cを上側の柱用PC部材22の上端部のスリーブ継手23(図3参照)の真上に位置合わせするが、この時点では、スリーブ継手23に挿入せず、柱主筋31cの先端が柱20Aの上面から上方に離間した状態とする。これは、後述のように他方のPC部材31BをPC部材32に組み付けるべく移動させる際に、当該他方のPC部材31Bの柱主筋31cが他方の柱20Bに干渉するのを防止するためである。
(2-3) Lifting and Temporary Assembly of PC Members 31A, 32, 31B As shown in FIGS. 7 and 8, one PC member 31A is lifted above one pillar 20A by a crane or the like, and PC The PC member 31A is tentatively placed on the pedestal 90 via the upper pedestal 94 with the main bar 31c protruding from the lower end surface of the joint portion 31a of the member 31A being separated from the upper end surface of the column 20A so as not to interfere with the column 20A. Install. At this time, the column main bars 31c projecting from the lower end surface of the connection part 31a are aligned right above the sleeve joint 23 (see FIG. 3) at the upper end of the upper column PC member 22. It is not inserted into the joint 23, but the tip of the column main bar 31c is in a state of being separated upward from the upper surface of the column 20A. This is to prevent the column main bars 31c of the other PC member 31B from interfering with the other column 20B when the other PC member 31B is moved to be assembled to the PC member 32 as described later.

次に、柱20Aの上部の、他方の柱20Bとは反対側の側面に、ブラケット96を柱20Aの上端面よりも上方へ延出させるように取り付けて、そのブラケット96をPC部材31Aの仕口部31aの側面にも取り付けて、ブラケット96によりPC部材31Aを柱20Aに仮固定する。なお、上述のように架台90の上面に上部架台94を設置して、PC部材31Aを架台90上に上部架台94を介して仮設置したが、このように仮設置したPC部材31Aの仕口部31aから突出する柱主筋31cの先端が柱20の上端面から離間した状態であり、PC部材31Aの橋幅方向の位置決めがブラケット96によってなされる。 Next, the bracket 96 is attached to the upper surface of the pillar 20A on the side opposite to the other pillar 20B so as to extend above the upper end surface of the pillar 20A, and the bracket 96 is attached to the PC member 31A. It is also attached to the side surface of the mouth portion 31a, and the PC member 31A is temporarily fixed to the column 20A by the bracket 96. As described above, the upper mount 94 is installed on the upper surface of the mount 90 and the PC member 31A is temporarily installed on the mount 90 via the upper mount 94. The tip of the column main bar 31c protruding from the portion 31a is in a state of being separated from the upper end surface of the column 20, and the bracket 96 positions the PC member 31A in the bridge width direction.

次に、PC部材32を架台90上に揚重して、PC部材32の端面をPC部材31Aの梁部31bの端面に対向させる。そして、PC部材32を橋幅方向にPC部材31Aに近づけて、梁部31bから突出した横梁主筋31dをPC部材32の端部のスリーブ継手32aに挿入することにより、PC部材32をPC部材31Aに仮組みする。 Next, the PC member 32 is hoisted on the gantry 90 so that the end surface of the PC member 32 faces the end surface of the beam portion 31b of the PC member 31A. Then, the PC member 32 is brought closer to the PC member 31A in the bridge width direction, and the horizontal beam main bar 31d protruding from the beam portion 31b is inserted into the sleeve joint 32a at the end of the PC member 32, whereby the PC member 32 is moved. Temporarily assemble.

次に、他方のPC部材31Bを他方の柱20Bの上方に揚重して、そのPC部材31Bの梁部31bの端面をPC部材32の端面に対向させる。そして、そのPC部材31Bを橋幅方向にPC部材32に近づけて、梁部31bから突出した横梁主筋31dをPC部材32の端部のスリーブ継手32aに挿入する。これによりPC部材31BをPC部材32に仮組みする。 Next, the other PC member 31B is lifted above the other pillar 20B, and the end surface of the beam portion 31b of the PC member 31B is opposed to the end surface of the PC member 32. Then, the PC member 31B is brought closer to the PC member 32 in the bridge width direction, and the horizontal beam main bar 31d protruding from the beam portion 31b is inserted into the sleeve joint 32a at the end of the PC member 32. Thereby, the PC member 31B is temporarily assembled to the PC member 32.

そして、図9に示すように、PC部材31Bの仕口部31aから突出する柱主筋31cの先端が柱20の上端面から離間した状態で、PC部材31Bを架台90上に上部架台94を介して仮設置する。この際、PC部材31Bの仕口部31aの下端面から突出した柱主筋31cを柱20Bの柱用PC部材22の上端部のスリーブ継手23(図4参照)の真上に位置合わせする。 Then, as shown in FIG. 9, the PC member 31B is placed on the pedestal 90 via the upper pedestal 94 with the tip of the column main bar 31c protruding from the joint portion 31a of the PC member 31B separated from the upper end surface of the column 20. Temporarily set up. At this time, the column main bars 31c protruding from the lower end surface of the joint portion 31a of the PC member 31B are aligned with the sleeve joint 23 (see FIG. 4) at the upper end of the column PC member 22 of the column 20B.

以上のように、架台90を柱20の上端面よりも高い位置において柱20間に掛け渡すように駒台92及び下部架台93上に設置したので、PC部材31A,32,31Bをクレーンによって順次揚重した上で、これらPC部材31A,32,31Bを架台90上に仮設置することができる。つまり、PC部材31A,32,31Bを個別にクレーンによって揚重するので、クレーンの最大揚重能力が低くても済む。 As described above, since the pedestal 90 is installed on the bridge base 92 and the lower pedestal 93 so as to be bridged between the pillars 20 at a position higher than the upper end surface of the pillar 20, the PC members 31A, 32, 31B are sequentially mounted by the crane. After hoisting, these PC members 31A, 32, 31B can be temporarily installed on the gantry 90. That is, since the PC members 31A, 32, 31B are individually lifted by the crane, the maximum lifting capacity of the crane can be low.

その後、柱20Bの上部の、他方の柱20Aとは反対側の側面に、ブラケット96を柱20Bの上端面よりも上方へ延出させるように取り付ける。次の下降工程をすぐに行えない場合には、このブラケット96をPC部材31Bの仕口部31aの側面にも取り付けて、PC部材31Bを柱20Bに仮固定する。なお、このブラケット96は、PC部材31Bの橋幅方向の位置決めに用いられる。 Then, the bracket 96 is attached to the upper side of the pillar 20B on the side opposite to the other pillar 20A so as to extend above the upper end surface of the pillar 20B. If the next lowering step cannot be performed immediately, this bracket 96 is also attached to the side surface of the joint portion 31a of the PC member 31B to temporarily fix the PC member 31B to the column 20B. The bracket 96 is used for positioning the PC member 31B in the bridge width direction.

(3)PC部材31A,32,31Bの接続体の下降工程
以上のように、柱20の上端面よりも高い位置でPC部材31A,32,31Bを接続したら、図10に示すようにこれらPC部材31A,32,31Bの接続体を下降させることにより、両側の仕口部31aの下面から突出する柱主筋31cを両側の柱用PC部材22の上端部のスリーブ継手23に挿入する。
以下、PC部材31A,32,31Bの下降工程について、図11〜図19を参照して詳細に説明する。図12、図14、図16及び図18は橋軸方向に向かって見た正面図であり、図11、図13、図15、図17及び図19は矢印Aの方向に向かって見て示した柱20の上部の拡大側面図である。
(3) Step of descending the connected body of the PC members 31A, 32, 31B As described above, when the PC members 31A, 32, 31B are connected at a position higher than the upper end surface of the column 20, as shown in FIG. By lowering the connecting body of the members 31A, 32, 31B, the column main bars 31c protruding from the lower surface of the joints 31a on both sides are inserted into the sleeve joints 23 at the upper ends of the column PC members 22 on both sides.
Hereinafter, the descending process of the PC members 31A, 32, 31B will be described in detail with reference to FIGS. 12, FIG. 14, FIG. 16 and FIG. 18 are front views seen in the bridge axis direction, and FIG. 11, FIG. 13, FIG. 15, FIG. 17 and FIG. It is an expanded side view of the upper part of the pillar 20.

(3−1)ジャッキ99による支持
図11に示すように、ジャッキ99に油圧機器98を接続する。そして、油圧機器98によってジャッキ99に油圧を供給することにより、ジャッキ99を下部架台93の下面に当接するまで伸長させて、ジャッキ99により下部架台93、架台90、上部架台94を介してPC部材31A,32,31Bを支持する。すなわち、PC部材31A,32,31Bの荷重を駒台92からジャッキ99に受け替える。
(3-1) Support by Jack 99 As shown in FIG. 11, a hydraulic device 98 is connected to the jack 99. By supplying hydraulic pressure to the jack 99 by the hydraulic device 98, the jack 99 is extended until it contacts the lower surface of the lower mount 93, and the jack 99 causes the PC member to pass through the lower mount 93, the mount 90, and the upper mount 94. 31A, 32, 31B are supported. That is, the load of the PC members 31A, 32, 31B is transferred from the bridge base 92 to the jack 99.

(3−2)駒台92の取り外し
この状態で、図12及び図13に示すように、一段分の駒台92を取り外す。更に、ブラケット96をPC部材31Aの仕口部31aから取り外す。また、PC部材31Bをブラケット96により仮止めした場合も、そのブラケット96をPC部材31Bから外す。
(3-2) Removing the frame base 92 In this state, as shown in FIGS. 12 and 13, the frame base 92 for one stage is removed. Further, the bracket 96 is removed from the joint portion 31a of the PC member 31A. Also, when the PC member 31B is temporarily fixed by the bracket 96, the bracket 96 is removed from the PC member 31B.

(3−3)ジャッキ99による下降
次に、図14及び図15に示すように、ジャッキ99によって、取り外した駒台92の高さ分だけ、下部架台93、架台90、上部架台94及びPC部材31A,32,31Bを下降させる。この状態では、PC部材31A,32,31Bの荷重は、再び、残った駒台92によって支持される。また、PC部材31A,32,31Bの下降によって、仕口部31aの下側にある柱主筋31cの先端部が柱用PC部材22の上端部のスリーブ継手23に挿入される。
(3-3) Lowering by Jack 99 Next, as shown in FIGS. 14 and 15, by the jack 99, the lower mount 93, the mount 90, the upper mount 94, and the PC member by the height of the removed piece base 92. 31A, 32, 31B are lowered. In this state, the loads of the PC members 31A, 32, 31B are again supported by the remaining piece base 92. Further, as the PC members 31A, 32, 31B are lowered, the tips of the column main bars 31c below the joint portion 31a are inserted into the sleeve joints 23 at the upper ends of the column PC members 22.

(3−4)ジャッキ99による再支持
図16及び図17に示すように、ジャッキ99の下の駒台97を取り外して、ジャッキ99を基台91上に直接設置する。そして、油圧機器98によってジャッキ99を下部架台93にまで伸長させて、ジャッキ99により下部架台93、架台90、上部架台94を介してPC部材31A,32,31Bを支持する。すなわち、PC部材31A,32,31Bの荷重を再びジャッキ99に受け替える。
(3-4) Resupport by Jack 99 As shown in FIGS. 16 and 17, the bridge base 97 under the jack 99 is removed and the jack 99 is directly installed on the base 91. Then, the jack 99 is extended to the lower mount 93 by the hydraulic equipment 98, and the jack 99 supports the PC members 31A, 32, 31B via the lower mount 93, the mount 90, and the upper mount 94. That is, the load of the PC members 31A, 32, 31B is transferred to the jack 99 again.

(3−5)駒台92の取り外し
次に、図16及び図17に示すように、ジャッキ99によりPC部材31A,32,31Bの荷重を支持した状態で、一段分の駒台92を取り外す。
(3-5) Removal of Frame Base 92 Next, as shown in FIGS. 16 and 17, with the jack 99 supporting the loads of the PC members 31A, 32, 31B, the frame base 92 for one stage is removed.

(3−6)ジャッキ99による再下降
次に、図18及び図19に示すように、ジャッキ99によって、取り外した駒台92の高さ分だけ、下部架台93、架台90、上部架台94及びPC部材31A,32,31Bを下降させる。この状態では、PC部材31A,32,31Bの荷重は、再び、残った駒台92によって支持される。また、PC部材31A,32,31Bの下降によって、PC部材31A,31Bの仕口部31aの下面から突出する柱主筋31cのほぼ全体が柱20A,20Bの上端部のスリーブ継手23に挿入される。
なお、PC部材31A,32,31Bの下降後も、PC部材31A,31Bの仕口部31aの下端面と柱20A,20Bの上端面との間には、グラウトを注入できる程度の隙間が空いている。
(3-6) Re-lowering by the jack 99 Next, as shown in FIGS. 18 and 19, by the jack 99, the lower mount 93, the mount 90, the upper mount 94 and the PC by the height of the removed piece base 92. The members 31A, 32, 31B are lowered. In this state, the loads of the PC members 31A, 32, 31B are again supported by the remaining piece base 92. Further, when the PC members 31A, 32, 31B are lowered, almost all of the column main bars 31c protruding from the lower surface of the joint portion 31a of the PC members 31A, 31B are inserted into the sleeve joint 23 at the upper ends of the columns 20A, 20B. ..
Even after the lowering of the PC members 31A, 32, 31B, there is a gap between the lower end surface of the joint portion 31a of the PC members 31A, 31B and the upper end surfaces of the columns 20A, 20B so that grout can be injected. ing.

(3−7)仮固定
上記のように柱20Aに取り付けておいたブラケット96を、PC部材31Aの仕口部31aの側面に固定する。これにより、PC部材31Aの仕口部31aの下端面と柱20Aの上端面との間にグラウトを注入できる程度の隙間を空けた状態で、ブラケット96によってPC部材31Aと柱20Aを仮固定する。同様に、反対側のブラケット96によってPC部材31Bと柱20Bを仮固定する。
(3-7) Temporary Fixing The bracket 96 attached to the column 20A as described above is fixed to the side surface of the joint portion 31a of the PC member 31A. As a result, the PC member 31A and the pillar 20A are temporarily fixed by the bracket 96 in a state where there is a gap between the lower end surface of the joint portion 31a of the PC member 31A and the upper end surface of the pillar 20A such that grout can be injected. .. Similarly, the PC member 31B and the pillar 20B are temporarily fixed by the bracket 96 on the opposite side.

以上のように、駒台92を一段ずつ取り外しながらジャッキ99によりPC部材31A,32,31Bの接続体及び架台90を下降させるので、PC部材31A,32,31Bの接続体の姿勢が安定し、柱主筋31cをスリーブ継手23に挿入しやすい。特に、ジャッキ99のストロークを短くすることができるので、ジャッキ99によってPC部材31A,32,31Bの接続体及び架台90を安定して支持することができる。 As described above, the jack 99 is used to lower the connection body of the PC members 31A, 32, 31B and the pedestal 90 while removing the piece base 92 step by step, so that the posture of the connection body of the PC members 31A, 32, 31B is stabilized, It is easy to insert the column main bar 31c into the sleeve joint 23. In particular, since the stroke of the jack 99 can be shortened, the jack 99 can stably support the connection body of the PC members 31A, 32, 31B and the pedestal 90.

(4)グラウトの充填工程
次に、図20に示すように、上側の柱用PC部材22の上端部のスリーブ継手23にグラウトを充填するとともに(モルタル充填工法)、仕口部31aの下端面と柱用PC部材22の上端面との間の隙間にグラウト38を充填する。柱用PC部材22の上端部のスリーブ継手23に充填されたグラウトが硬化することによって、柱主筋31cが柱用PC部材21の主筋に連結される。
また、PC部材32の端部のスリーブ継手32aにグラウトを充填するとともに(モルタル充填工法)、PC部材32の端面と梁部31bの端面との間にグラウトを充填する。PC部材32の端部のスリーブ継手32aに充填されたグラウトが硬化することによって、横梁主筋31dがPC部材32の主筋に連結される。
グラウトが硬化したら、ブラケット96、基台91、駒台92、下部架台93、架台90、上部架台94及びジャッキ99を撤去する。
以上により、門形ラーメン構造2が完成する。
なお、(4)の工程は、後述の「(5)縦梁8の設置工程」の後に行ってもよく、例えば後述の「(6)グラウトの充填工程」と並行して行ってもよい。
(4) Grout Filling Step Next, as shown in FIG. 20, while filling the grout into the sleeve joint 23 at the upper end of the upper column PC member 22 (mortar filling method), the lower end surface of the joint portion 31a. The grout 38 is filled in the gap between the upper end surface of the column PC member 22 and the column PC member 22. As the grout filled in the sleeve joint 23 at the upper end of the column PC member 22 is cured, the column main bar 31c is connected to the column PC member 21.
The sleeve joint 32a at the end of the PC member 32 is filled with grout (mortar filling method), and the grout is filled between the end surface of the PC member 32 and the end surface of the beam portion 31b. When the grout filled in the sleeve joint 32a at the end of the PC member 32 is hardened, the horizontal beam main reinforcement 31d is connected to the main reinforcement of the PC member 32.
After the grout hardens, the bracket 96, the base 91, the piece base 92, the lower mount 93, the mount 90, the upper mount 94, and the jack 99 are removed.
The gate-shaped ramen structure 2 is completed by the above.
The step (4) may be performed after the later-described “(5) Step of installing the vertical beam 8”, for example, may be performed in parallel with the later-described “(6) Grouting process”.

(5)縦梁8の設置工程
以上のように門形ラーメン構造2を施工したら、図21に示すように縦梁用PC部材80をクレーン等によって揚重して、縦梁用PC部材80の長手方向を橋軸方向にして縦梁用PC部材80の端面を仕口部31aの側面に向ける。ここで、この縦梁用PC部材80は完成後の縦梁8に相当する。縦梁用PC部材80の両端面には、スリーブ継手81が埋設されている。なお、図21では、一方の端部に埋設されたスリーブ継手81が図示されているが、反対側の端部にもスリーブ継手81が埋設されている。
(5) Installation process of the vertical beam 8 After the portal frame structure 2 is constructed as described above, the vertical beam PC member 80 is lifted by a crane or the like as shown in FIG. The end face of the vertical beam PC member 80 is directed to the side face of the joint portion 31a with the longitudinal direction being the bridge axis direction. Here, the vertical beam PC member 80 corresponds to the completed vertical beam 8. Sleeve joints 81 are embedded in both end faces of the vertical beam PC member 80. In FIG. 21, the sleeve joint 81 buried in one end is shown, but the sleeve joint 81 is also buried in the opposite end.

その後、図22に示すように、縦梁用PC部材80を橋軸方向に仕口部31aに向けて移動させて、縦梁用PC部材80のスリーブ継手81に仕口部31aから突出する縦梁主筋31eを挿入する。そして、縦梁用PC部材80の端面と仕口部31aの側面との間に隙間を空けた状態で、縦梁用PC部材80を支保工等によって支持する。 After that, as shown in FIG. 22, the vertical beam PC member 80 is moved in the bridge axis direction toward the joint portion 31a, and the sleeve joint 81 of the vertical beam PC member 80 is vertically protruded from the joint portion 31a. The main beam reinforcement 31e is inserted. Then, the vertical beam PC member 80 is supported by supporting work or the like in a state where there is a gap between the end surface of the vertical beam PC member 80 and the side surface of the joint portion 31a.

(6)グラウトの充填工程
次に、スリーブ継手81にグラウトを充填するとともに、縦梁用PC部材80と仕口部31aとの間の隙間にもグラウトを充填する。これらの充填されたグラウトが硬化することによって、仕口部31aに縦梁用PC部材80が接合される。
(6) Grout Filling Step Next, the sleeve joint 81 is filled with grout, and the gap between the vertical beam PC member 80 and the joint portion 31a is also filled with grout. By hardening these filled grouts, the vertical beam PC member 80 is joined to the joint portion 31a.

(7)門形ラーメン構造5の横梁60及び仕口部70の施工工程
次に、図23に示すようにクレーン等によって2体のPC部材61,61を順に柱20の上方に揚重し、図24に示すようにこれらPC部材61,61を橋幅方向に近接するように移動させることにより接続する。これにより、横梁60及び仕口部70を一体化して構築するが、その詳細は後述する。なお、以下において、一対のPC部材61,61を区別する場合は、一方をPC部材61Aと、他方をPC部材61Bと称し、また、一対の柱50,50を区別する場合は、PC部材61A側の柱50を柱50Aと称し、PC部材61B側の柱50を柱50Bと称するものとする。
(7) Process of constructing the cross beam 60 and the joint portion 70 of the gate-shaped rigid frame structure Next, as shown in FIG. 23, the two PC members 61, 61 are sequentially lifted above the column 20 by a crane or the like, As shown in FIG. 24, the PC members 61, 61 are connected by moving them so as to approach each other in the bridge width direction. As a result, the horizontal beam 60 and the joint portion 70 are integrally constructed, which will be described in detail later. In the following, when distinguishing a pair of PC members 61, 61, one is called a PC member 61A and the other is called a PC member 61B, and when distinguishing a pair of columns 50, 50, a PC member 61A. The column 50 on the side is referred to as a column 50A, and the column 50 on the PC member 61B side is referred to as a column 50B.

図23に示すように、PC部材61Aは、仕口部61aと、仕口部61aから橋幅方向に延出した梁部61bと、を有し、PC部材61Bも同様に仕口部61a及び梁部61bを有する。PC部材61A,61Bの何れにおいても、仕口部61aは完成後の仕口部70に相当し、梁部61bは完成後の横梁60の半体に相当する。また、PC部材61A,61Bの何れにおいても、仕口部61aの下面から複数の柱主筋61cが下向きに突出し、仕口部61aには貫通孔61fが橋軸方向に貫通するように形成されている。一方のPC部材61Bの梁部61bの端面から複数の横梁主筋61dが橋幅方向に突出し、他方のPC部材61Aの梁部61bの端部には、スリーブ継手61eが埋設されている。 As shown in FIG. 23, the PC member 61A has a joint portion 61a and a beam portion 61b extending from the joint portion 61a in the bridge width direction, and the PC member 61B similarly has the joint portion 61a and the joint portion 61a. It has a beam portion 61b. In both the PC members 61A and 61B, the joint portion 61a corresponds to the completed joint portion 70, and the beam portion 61b corresponds to the half body of the completed transverse beam 60. Further, in each of the PC members 61A and 61B, a plurality of column main bars 61c project downward from the lower surface of the joint portion 61a, and a through hole 61f is formed in the joint portion 61a so as to penetrate in the bridge axis direction. There is. A plurality of horizontal beam main bars 61d project from the end face of the beam portion 61b of one PC member 61B in the bridge width direction, and a sleeve joint 61e is embedded in the end portion of the beam portion 61b of the other PC member 61A.

また、門形ラーメン構造2を施工する場合と同様に(上記(2)参照)、架台90、基台91、駒台92、下部架台93、上部架台94、駒台97及びジャッキ99を柱20の上部に設置して、PC部材31、PC部材32及びPC部材31を組み付ける場合と同様にして(図5〜図9参照)、架台90、基台91、駒台92、下部架台93、上部架台94、駒台97及びジャッキ99を柱50の上部に設置して、PC部材61A,61Bを柱50A,50Bの上方で組み付けて、PC部材61A,61Bを架台90上に仮設置する。具体的には、まずPC部材61Aをクレーンによって柱50Aの上方に揚重して、PC部材61Aの仕口部61aの下面から突出する柱主筋61cを柱50Aの上端部のスリーブ継手53の真上に位置合わせし、PC部材61Aを架台90上に上部架台94を介して仮設置する。次に、PC部材61Bをクレーンによって柱50Bの上方に揚重して、PC部材61Bの梁部61bの端面をPC部材61Aの梁部61bの端面に対向させた状態で、PC部材61BをPC部材61Aに近づけて、横梁主筋61dをスリーブ継手61eに挿入する。そして、PC部材61Bの仕口部61aの下面から突出する柱主筋61cを柱50Bのスリーブ継手53の真上に位置合わせし、PC部材61Aを架台90上に上部架台94を介して仮設置する。 In addition, as in the case of constructing the gate-shaped rigid frame structure 2 (see (2) above), the pedestal 90, the base 91, the piece base 92, the lower pedestal 93, the upper pedestal 94, the piece pedestal 97 and the jack 99 are connected to the pillar 20. Installed on the upper part of the PC member 31, the PC member 32, and the PC member 31 in the same manner as in the case of assembling (see FIGS. 5 to 9). The pedestal 94, the piece pedestal 97 and the jack 99 are installed on the upper part of the pillar 50, the PC members 61A and 61B are assembled above the pillars 50A and 50B, and the PC members 61A and 61B are temporarily installed on the pedestal 90. Specifically, first, the PC member 61A is lifted above the pillar 50A by a crane, and the pillar main bar 61c protruding from the lower surface of the joint portion 61a of the PC member 61A is attached to the sleeve joint 53 at the upper end of the pillar 50A. The PC member 61</b>A is positioned above and the PC member 61</b>A is temporarily installed on the mount 90 via the upper mount 94. Next, the PC member 61B is lifted above the pillar 50B by a crane so that the end face of the beam portion 61b of the PC member 61B is opposed to the end face of the beam portion 61b of the PC member 61A. The main beam 61d of the horizontal beam is inserted into the sleeve joint 61e while approaching the member 61A. Then, the column main bars 61c projecting from the lower surface of the joint portion 61a of the PC member 61B are aligned right above the sleeve joint 53 of the column 50B, and the PC member 61A is temporarily installed on the frame 90 via the upper frame 94. ..

(8)門形ラーメン構造5の横梁60及び仕口部70の下降工程
次に、上述の「(3)PC部材31A,32,31Bの下降工程」のようなPC部材31A,32,31Bの下降と同様にして、図25に示すようにPC部材61A,61Bをジャッキによって下降させることにより、PC部材61A,61Bの仕口部61aの下端面から突出した柱主筋61cを柱50A,50Bの上端部のスリーブ継手53に挿入する。ここで、縦梁用PC部材80のスリーブ継手(図21に図示のスリーブ継手81の反対側のスリーブ継手)に仕口部61aの貫通孔61f(図23参照)を対向させるよう、貫通孔61fの位置合わせをする。
(8) Step of lowering the horizontal beam 60 and the joint portion 70 of the gate-shaped rigid frame structure 5 Next, the PC members 31A, 32, 31B as in "(3) Step of lowering the PC members 31A, 32, 31B" described above. In the same manner as the descent, by lowering the PC members 61A and 61B with a jack as shown in FIG. 25, the column main bars 61c protruding from the lower end surface of the joint portion 61a of the PC members 61A and 61B are connected to the columns 50A and 50B. Insert into the sleeve joint 53 at the upper end. Here, the through hole 61f is formed so that the through hole 61f (see FIG. 23) of the joint portion 61a faces the sleeve joint of the vertical beam PC member 80 (the sleeve joint on the opposite side of the sleeve joint 81 shown in FIG. 21). Align.

(9)グラウトの充填工程
次に、上述の「(4)グラウトの充填工程」と同様にして、上側の柱用PC部材52の上端面のスリーブ継手53にグラウトを充填するとともに、仕口部61aの下端面と柱用PC部材62の上端面との間の隙間にグラウトを充填する。以上により門形ラーメン構造2の隣りの門形ラーメン構造5が完成する。なお、(9)の工程は、例えば後述の「(11)グラウトの充填工程」と並行して行ってもよい。
(9) Grout Filling Step Next, in the same manner as the above-mentioned “(4) Grout filling step”, the sleeve joint 53 on the upper end surface of the upper column PC member 52 is filled with grout and the joint portion is formed. The gap between the lower end surface of 61a and the upper end surface of the columnar PC member 62 is filled with grout. Through the above steps, the portal-shaped ramen structure 5 adjacent to the portal-shaped ramen structure 2 is completed. The step (9) may be performed, for example, in parallel with the “(11) grout filling step” described later.

(10)縦梁8の設置工程
以上のように門形ラーメン構造5を施工したら、図26に示すように縦梁用PC部材83をクレーン等によって揚重して、縦梁用PC部材83の長手方向を橋軸方向にして縦梁用PC部材83の端面を仕口部61aに向ける。ここで、この縦梁用PC部材83は完成後の縦梁8に相当する。また、縦梁用PC部材83の一方の端面(仕口部61aに向けられた端面)から複数の縦梁主筋84が突出しており、他方の端部には複数のスリーブ継手(図示略)が設けられている。
(10) Installation process of vertical beam 8 After the portal frame structure 5 is constructed as described above, the vertical beam PC member 83 is lifted by a crane or the like as shown in FIG. The end face of the vertical beam PC member 83 is directed to the joint portion 61a with the longitudinal direction being the bridge axis direction. Here, the vertical beam PC member 83 corresponds to the completed vertical beam 8. In addition, a plurality of vertical beam main bars 84 project from one end surface of the vertical beam PC member 83 (an end surface facing the joint portion 61a), and a plurality of sleeve joints (not shown) are provided at the other end portion. It is provided.

その後、図27に示すように、縦梁用PC部材83を橋軸方向に仕口部61aに近接させる。この際、縦梁主筋84を仕口部61aの貫通孔61f(図23参照)に貫通させて、更に縦梁用PC部材80のスリーブ継手(図21に図示のスリーブ継手81の反対側のスリーブ継手)に挿入する。
そして、縦梁用PC部材83の端面と仕口部61aとの間に隙間を空けた状態で、縦梁用PC部材83を支保工等によって支持する。
Then, as shown in FIG. 27, the vertical beam PC member 83 is brought close to the joint portion 61a in the bridge axis direction. At this time, the vertical beam main bar 84 is passed through the through hole 61f (see FIG. 23) of the joint portion 61a, and further, the sleeve joint of the vertical beam PC member 80 (the sleeve on the side opposite to the sleeve joint 81 shown in FIG. 21). Fitting).
Then, the vertical beam PC member 83 is supported by supporting or the like with a gap left between the end face of the vertical beam PC member 83 and the joint portion 61a.

(11)グラウトの充填工程
次に、縦梁用PC部材80のスリーブ継手(図21に図示のスリーブ継手81の反対側のスリーブ継手)及び仕口部61aの貫通孔61f(図23参照)にグラウトを充填するとともに、縦梁用PC部材83の端面と仕口部61aとの間の隙間にもグラウトを充填する。
(11) Grouting process Next, the sleeve joint of the vertical beam PC member 80 (the sleeve joint on the opposite side of the sleeve joint 81 shown in FIG. 21) and the through hole 61f (see FIG. 23) of the joint portion 61a are formed. In addition to filling the grout, the gap between the end surface of the vertical beam PC member 83 and the joint portion 61a is also filled with grout.

(12)
上記(7)〜(11)の工程と同様にして、門形ラーメン構造5の横梁60及び仕口部70の構築と縦梁8の設置を交互に実施する。
以上によりラーメン構造1が完成する。その後、縦梁8、横梁30及び横梁60によって囲われた領域をスラブによって塞ぐようにして、スラブを縦梁8、横梁30、横梁60、仕口部40及び仕口部70上に構築する。
(12)
In the same manner as the above steps (7) to (11), the construction of the horizontal beam 60 and the joint portion 70 of the portal frame structure 5 and the installation of the vertical beam 8 are alternately performed.
The ramen structure 1 is completed by the above. After that, the slab is constructed on the vertical beam 8, the horizontal beam 30, the horizontal beam 60, the joint portion 40, and the joint portion 70 by closing the region surrounded by the vertical beam 8, the transverse beam 30, and the transverse beam 60 with the slab.

3. 効果
(a) 図3に示すようにPC部材31A,32,31Bを柱20A,20Bの上端面よりも高い位置まで揚重するので、PC部材31A,31Bの仕口部31aの下面から柱主筋31cが突出する状態でも、柱主筋31cが柱20A,20Bに干渉することなく、図4に示すようにPC部材31A,32,31Bを橋幅方向に接続することができる。その後、図10に示すように、PC部材31A,32,31Bの接続体を下降させて、PC部材31A,31Bの柱主筋31cを柱20A,20Bの上端面のスリーブ継手23に挿入するので、鉄筋を仕口部31aに上方から下方へ貫通させることなく、PC部材31A,31Bの仕口部31aと柱20A,20Bとを接合することができる。門形ラーメン構造5を構築する際にも、PC部材61A,61Bを柱50A,50Bの上端面よりも高い位置まで揚重するので、同様の効果を奏する。
3. Effect (a) As shown in FIG. 3, since the PC members 31A, 32, 31B are lifted up to a position higher than the upper end surfaces of the columns 20A, 20B, the PC main members 31A, 31B are connected to each other from the bottom surface of the joint portion 31a. Even in the state in which 31c is projected, the PC members 31A, 32, 31B can be connected in the bridge width direction as shown in FIG. 4 without the column main bars 31c interfering with the columns 20A, 20B. After that, as shown in FIG. 10, the connecting body of the PC members 31A, 32, 31B is lowered to insert the column main bars 31c of the PC members 31A, 31B into the sleeve joint 23 of the upper end faces of the columns 20A, 20B. The joint portion 31a of the PC members 31A and 31B and the columns 20A and 20B can be joined without penetrating the reinforcing bar from the upper portion to the lower portion of the joint portion 31a. Even when the portal-shaped rigid frame structure 5 is constructed, the PC members 61A and 61B are lifted to a position higher than the upper end surfaces of the columns 50A and 50B, so that the same effect is obtained.

(b) 架台90を柱20間に掛け渡すように駒台92及び下部架台93上に設置し、架台90でPC部材31A,32,31Bを支持しながら、PC部材31A,32,31Bを橋幅方向に接続するので、クレーンの最大揚重能力が低くてすむ。門形ラーメン構造5を構築する際にも、架台90、基台91、駒台92、下部架台93及び上部架台94を柱50の上部に設置するので、同様の効果を奏する。 (B) The pedestal 90 is installed on the bridge 92 and the lower pedestal 93 so as to be bridged between the pillars 20, and the PC members 31A, 32, 31B are bridged while the PC members 31A, 32, 31B are supported by the pedestal 90. Since it is connected in the width direction, the maximum lifting capacity of the crane is low. When the portal-shaped rigid frame structure 5 is constructed, the pedestal 90, the base 91, the frame 92, the lower pedestal 93, and the upper pedestal 94 are installed on the upper part of the pillar 50, and therefore, the same effect is obtained.

(c) 駒台92を一段ずつ取り外しながらジャッキ99によりPC部材31A,32,31Bの接続体及び架台90を下降させるので、下降の際のPC部材31A,32,31Bの接続体の姿勢が安定して、柱主筋31cをスリーブ継手23に挿入しやすい。門形ラーメン構造5を構築する際にも、架台90、基台91、駒台92、下部架台93、上部架台94、駒台97及びジャッキ99を柱50A,50Bの上部に設置するので、同様の効果を奏する。 (C) Since the connecting body of the PC members 31A, 32, 31B and the gantry 90 are lowered by the jack 99 while removing the piece base 92 step by step, the posture of the connecting body of the PC members 31A, 32, 31B at the time of lowering is stable. Then, it is easy to insert the column main bar 31c into the sleeve joint 23. When the portal-shaped ramen structure 5 is constructed, the pedestal 90, the base 91, the piece base 92, the lower pedestal 93, the upper pedestal 94, the piece pedestal 97, and the jack 99 are installed above the columns 50A and 50B. Produce the effect of.

4. 変形例
以上、本発明を実施するための形態について説明したが、上記実施形態は本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。また、本発明はその趣旨を逸脱することなく変更、改良され得るとともに、本発明にはその等価物も含まれる。以下に、以上の実施形態からの変更点について説明する。以下に説明する変更点は、可能な限り組み合わせて適用してもよい。
4. Modifications Although the embodiments for carrying out the present invention have been described above, the above embodiments are for the purpose of facilitating the understanding of the present invention, and are not for limiting and interpreting the present invention. Further, the present invention can be modified and improved without departing from the spirit thereof, and the present invention includes equivalents thereof. The changes from the above embodiment will be described below. The changes described below may be combined and applied as much as possible.

(a) 上記実施形態では、複数の柱主筋31cが仕口部31aの下面から突出し、複数のスリーブ継手23が柱用PC部材22の上端部に設けられていたが、これに限らず、図28に示すように、複数の柱主筋24が柱用PC部材22の上端面から突出し、複数のスリーブ継手31fが仕口部31aの下端部に埋設されていてもよい。この場合、上記(3)の工程において、PC部材31A,32,31Bの接合体を下降させると、柱主筋24がスリーブ継手31fに挿入される。
門形ラーメン構造5についても同様に、仕口部61aの下面から複数の柱主筋が突出し、柱用PC部材52の上端部にスリーブ継手が埋設されていてもよい。
(A) In the above embodiment, the plurality of column main bars 31c protrude from the lower surface of the joint portion 31a and the plurality of sleeve joints 23 are provided at the upper end of the column PC member 22, but the present invention is not limited to this. As shown in 28, the plurality of column main bars 24 may protrude from the upper end surface of the column PC member 22, and the plurality of sleeve joints 31f may be embedded in the lower end of the joint portion 31a. In this case, when the joined body of the PC members 31A, 32, 31B is lowered in the step (3), the column main bar 24 is inserted into the sleeve joint 31f.
Similarly for the portal-shaped rigid frame structure 5, a plurality of pillar main bars may project from the lower surface of the joint portion 61a, and a sleeve joint may be embedded in the upper end portion of the pillar PC member 52.

(b) 上記実施形態では、門形ラーメン構造2は両側の2本の柱20A,20Bを備えていたが、これに限らず、図29に示すように、例えば、両側の柱20A,20Bの間隔が大きい場合には、これら柱20A,20Bの間に1本又は複数本の柱を備えている(つまり、2スパン以上の門形ラーメン構造である)こととしてもよい(図29には中央部に一本の柱25を備える2スパンの場合を示す。)。ラーメン構造5についても同様である。 (B) In the above-described embodiment, the portal-shaped ramen structure 2 includes the two columns 20A and 20B on both sides, but the present invention is not limited to this, and as shown in FIG. 29, for example, the columns 20A and 20B on both sides may be used. When the distance is large, one or a plurality of pillars may be provided between the pillars 20A and 20B (that is, a portal-shaped rigid frame structure with two or more spans) (in FIG. 29, the center). The case of two spans with one column 25 in the section is shown). The same applies to the ramen structure 5.

この場合、図29に示すように、一方の横梁30が一方の柱20Aと柱25の上端間に架設され、他方の横梁30が他方の柱20Bと柱25の上端間に架設されている。 In this case, as shown in FIG. 29, one horizontal beam 30 is installed between the upper ends of the one column 20A and the column 25, and the other horizontal beam 30 is installed between the other column 20B and the upper ends of the columns 25.

図29に示すラーメン構造を構築する場合には、まず、図30に示すように両側の柱20A,20Bを上述の実施形態と同様に施工するとともに、それらの間に柱25を施工する(図30参照)。柱25の施工も、下側の柱用PC部材26と柱用PC部材27とを柱20と同様にして接合することにより。なお、柱用PC部材27についても柱用PC部材22と同様に、柱用PC部材27の上端部にスリーブ継手28が埋設されている。 When constructing the ramen structure shown in FIG. 29, first, as shown in FIG. 30, the columns 20A and 20B on both sides are constructed in the same manner as in the above-described embodiment, and the column 25 is constructed between them (FIG. 30). The pillar 25 is also constructed by joining the lower-side pillar PC member 26 and the pillar-side PC member 27 in the same manner as the pillar 20. As with the pillar PC member 22, the pillar PC member 27 also has a sleeve joint 28 embedded in the upper end of the pillar PC member 27.

次に、上記(2)の工程と同様にして、クレーン等によってPC部材31A、PC部材32、PC部材33、PC部材32及びPC部材31Bをこれらの順に柱20A,25,20Bの上方に揚重し、図30に示すようにこれらPC部材31A、PC部材32、PC部材33、PC部材32及びPC部材31Bを橋幅方向に近接して接続する。これにより、柱20A,25,20Bの上方において、両側の仕口部40、中央の仕口部45及び横梁30を組み立てる。ここで、PC部材31A,32,32,31Bは上述の実施形態と同様のものである。また、PC部材33は、仕口部33aと、仕口部33aから橋幅方向の両側に延出した一対の梁部33bと、を有する。仕口部33aは完成後の仕口部45に相当し、梁部33bは完成後の横梁30の端部に相当する。仕口部33aの下端面から複数の柱主筋33cが突出している。また、梁部33bの端面から複数の横梁主筋33dが橋幅方向に突出しており、PC部材32とPC部材33を組み付ける際に、横梁主筋33dをPC部材32の端部のスリーブ継手32aに挿入する。 Then, in the same manner as in the step (2), the PC member 31A, the PC member 32, the PC member 33, the PC member 32, and the PC member 31B are lifted above the columns 20A, 25, 20B in this order by a crane or the like. Then, as shown in FIG. 30, the PC member 31A, the PC member 32, the PC member 33, the PC member 32, and the PC member 31B are connected close to each other in the bridge width direction. As a result, above the pillars 20A, 25, 20B, the joint portions 40 on both sides, the joint portion 45 at the center, and the cross beam 30 are assembled. Here, the PC members 31A, 32, 32, 31B are the same as those in the above-described embodiment. Further, the PC member 33 has a joint portion 33a and a pair of beam portions 33b extending from the joint portion 33a to both sides in the bridge width direction. The joint portion 33a corresponds to the completed joint portion 45, and the beam portion 33b corresponds to the end portion of the completed horizontal beam 30. A plurality of column main bars 33c project from the lower end surface of the joint portion 33a. Further, a plurality of horizontal beam main bars 33d project from the end surface of the beam portion 33b in the bridge width direction, and when the PC member 32 and the PC member 33 are assembled, the horizontal beam main bars 33d are inserted into the sleeve joint 32a at the end of the PC member 32. To do.

次に、上記(3)の工程と同様にして、組まれたPC部材31A、PC部材32、PC部材33、PC部材32、PC部材31Bをジャッキによって下降させることにより、仕口部31a,33a,31の下側にある柱主筋31c,33c,31cを柱用PC部材22,27,22の上端部のスリーブ継手23,28,23に挿入する。 Next, in the same manner as in the above step (3), the assembled PC member 31A, PC member 32, PC member 33, PC member 32, and PC member 31B are lowered by a jack, so that the joint portions 31a, 33a. The column main bars 31c, 33c, 31c on the lower side of the columns 31, 31 are inserted into the sleeve joints 23, 28, 23 at the upper ends of the column PC members 22, 27, 22.

次に、上記(4)の工程と同様にして、グラウトによりPC部材31A,31Bの仕口部31aと柱用PC部材22を接合するとともに、グラウトによりPC部材33の仕口部33aと柱用PC部材27を接合する。 Next, in the same manner as in the above step (4), the joint portion 31a of the PC members 31A and 31B and the columnar PC member 22 are joined by grout, and the joint portion 33a of the PC member 33 and the columnar member are joined by grout. The PC member 27 is joined.

(c) 上記実施形態では、両側のPC部材31A,31Bが仕口部31aと梁部31bを一体成形したものであった(図9、図34(a)参照)。それに対して、図31及び図34(c)に示すようにPC部材31A,31Bが梁部を有さない構成としてもよい。この場合、上記実施形態における横梁主筋31dに相当する横梁主筋31gが仕口部31aから橋幅方向に突出している。そして、上記(2)の工程において、PC部材32を両側のPC部材31A,31Bの仕口部31aの間に挟むようにPC部材31A,32,31Bを橋幅方向に接続するが、この際、横梁主筋31gをPC部材32の端部のスリーブ継手32aに挿入する。なお、PC部材32の両端面から突出した横梁主筋を、仕口部31aの側部に設けられたスリーブ継手に挿入するものとしてもよい。 (C) In the above-described embodiment, the PC members 31A and 31B on both sides are integrally formed with the joint portion 31a and the beam portion 31b (see FIGS. 9 and 34(a)). On the other hand, as shown in FIGS. 31 and 34(c), the PC members 31A and 31B may have no beam portion. In this case, a horizontal beam main bar 31g corresponding to the horizontal beam main bar 31d in the above-described embodiment projects in the bridge width direction from the joint portion 31a. Then, in the step (2), the PC members 31A, 32, 31B are connected in the bridge width direction so as to sandwich the PC member 32 between the joint portions 31a of the PC members 31A, 31B on both sides. , The horizontal beam main bar 31g is inserted into the sleeve joint 32a at the end of the PC member 32. The horizontal beam main bars protruding from both end surfaces of the PC member 32 may be inserted into the sleeve joints provided on the side portions of the joint portion 31a.

(d) 上記実施形態では、両側のPC部材31A,31Bが仕口部31aと梁部31bを一体成形したものであり、PC部材32をPC部材31A,31Bの間に挟み込んだ(図9、図34(a)参照)。それに対して、図32及び図34(d)に示すように、一方のPC部材31Aがスパン全長に亘る梁部31bを有し、他方のPC部材31Bが梁部を有しない仕口部31aのみの構成とし、PC部材32を設けなくてもよい。この場合、横梁主筋31dに相当する横梁主筋31hがPC部材31Bの仕口部31aから橋幅方向に突出しており、スリーブ継手32aに相当するスリーブ継手31jがPC部材31Aの梁部31bの端部に埋設されている。そして、上記(2)の工程において、PC部材31BをPC部材31Aに近接させて、PC部材31A,31Bを橋幅方向に接続するが、この際、横梁主筋31hをPC部材31Aの梁部31bの端部のスリーブ継手31jに挿入する。なお、PC部材31Aの梁部31bの端面から突出した横梁主筋を、PC部材31Bの仕口部31aの側部に設けられたスリーブ継手に挿入するものとしてもよい。 (D) In the above embodiment, the PC members 31A and 31B on both sides are integrally formed with the joint portion 31a and the beam portion 31b, and the PC member 32 is sandwiched between the PC members 31A and 31B (FIG. 9, FIG. 34(a)). On the other hand, as shown in FIGS. 32 and 34(d), one PC member 31A has a beam portion 31b extending over the entire span, and the other PC member 31B has only a joint portion 31a having no beam portion. In this configuration, the PC member 32 may not be provided. In this case, a horizontal beam main bar 31h corresponding to the horizontal beam main bar 31d projects in the bridge width direction from the joint 31a of the PC member 31B, and a sleeve joint 31j corresponding to the sleeve joint 32a is an end part of the beam part 31b of the PC member 31A. It is buried in. Then, in the step (2), the PC member 31B is brought close to the PC member 31A to connect the PC members 31A and 31B in the bridge width direction. At this time, the horizontal beam main bar 31h is connected to the beam portion 31b of the PC member 31A. Insert it into the sleeve joint 31j at the end. The horizontal beam main bar protruding from the end surface of the beam portion 31b of the PC member 31A may be inserted into the sleeve joint provided on the side portion of the joint portion 31a of the PC member 31B.

(e) 図33及び図34(e)に示すように、一方のPC部材31Aが上記実施形態のように仕口部31aと梁部31bを一体成形したものであり、他方のPC部材31Bが上記(c)の変形例のように梁部を有しない仕口部31aのみの構成としてもよい。 (E) As shown in FIGS. 33 and 34(e), one of the PC members 31A is formed by integrally molding the joint portion 31a and the beam portion 31b as in the above embodiment, and the other PC member 31B is formed. As in the modified example of (c) above, only the joint portion 31a having no beam portion may be configured.

(f) 上記実施形態及び変形例(c)〜(e)では、PC部材31A、PC部材32、PC部材31B、PC部材61A及びPC部材61Bが図34(a)〜(e)のような形態であった。図34(f)〜(h)に示すように、PC部材32に相当する中間梁部材39が複数のPC部材39aの接合体であってもよい。つまり、上記(2)の工程において、PC部材31Aを揚重した後、これらPC部材39aを順次揚重して橋幅方向に接続し、その後更にPC部材31Bを揚重して、そのPC部材31Bを端のPC部材39aに接続することにより横梁30を構築してもよい。ここで、図34(f)に示す中間梁部材39は図34(a)に示すPC部材32に相当するものであり、図34(g)に示す中間梁部材39は図34(c)に示すPC部材32に相当するものであり、図34(h)に示す中間梁部材39は図34(e)に示すPC部材32に相当するものである。 (F) In the embodiment and the modified examples (c) to (e), the PC member 31A, the PC member 32, the PC member 31B, the PC member 61A, and the PC member 61B are as shown in FIGS. 34(a) to (e). It was in the form. As shown in FIGS. 34F to 34H, the intermediate beam member 39 corresponding to the PC member 32 may be a joined body of a plurality of PC members 39a. That is, in the above step (2), after the PC member 31A is lifted, these PC members 39a are sequentially lifted and connected in the bridge width direction, and then the PC member 31B is further lifted to obtain the PC member. The horizontal beam 30 may be constructed by connecting 31B to the PC member 39a at the end. Here, the intermediate beam member 39 shown in FIG. 34(f) corresponds to the PC member 32 shown in FIG. 34(a), and the intermediate beam member 39 shown in FIG. 34(g) is shown in FIG. 34(c). This corresponds to the PC member 32 shown, and the intermediate beam member 39 shown in FIG. 34(h) corresponds to the PC member 32 shown in FIG. 34(e).

(g) 上記実施形態では、門形ラーメン構造2,5を基礎上に構築したが、これに限らず、構築済みの門形ラーメン構造の上に構築してもよい。この場合、構築済みの下側の門形ラーメン構造は、上記実施形態で示した工法で施工されたものであってもよい。すなわち、本発明は、2層以上の門形ラーメン構造を構築する場合にも適用可能である。 (G) In the above embodiment, the portal-shaped ramen structures 2 and 5 were constructed on the foundation, but the present invention is not limited to this, and they may be constructed on the already constructed portal-shaped ramen structure. In this case, the already constructed lower portal-shaped rigid frame structure may be constructed by the construction method shown in the above embodiment. That is, the present invention can be applied to the case of constructing a portal ramen structure having two or more layers.

(h) 上記実施形態では、ラーメン構造1が鉄道高架橋用であった。それに対して、ラーメン構造1が道路その他の高架橋用であってもよい。 (H) In the above-described embodiment, the rigid frame structure 1 is for a railway viaduct. On the other hand, the rigid frame structure 1 may be for roads and other viaducts.

1…ラーメン構造, 2…門形ラーメン構造, 5…門形ラーメン構造, 20…柱, 23…スリーブ継手, 30…横梁, 31…PC部材(第一PC部材), 32…PC部材(第二PC部材)、 31a…仕口部, 31b…梁部, 31c…柱主筋, 40…仕口部, 50…柱, 53…スリーブ継手, 60…横梁, 61…PC部材, 61a…仕口部, 61b…梁部, 61c…柱主筋, 70…仕口部, 90…架台, 91…基台, 92…駒台, 99…ジャッキ 1... Ramen structure, 2... Gate-shaped ramen structure, 5... Gate-shaped ramen structure, 20... Pillar, 23... Sleeve joint, 30... Horizontal beam, 31... PC member (first PC member), 32... PC member (second) PC member), 31a... Joint portion, 31b... Beam portion, 31c... Column main bar, 40... Joint portion, 50... Column, 53... Sleeve joint, 60... Horizontal beam, 61... PC member, 61a... Joint portion, 61b... Beam part, 61c... Column main bar, 70... Connection part, 90... Stand, 91... Base, 92... Piece stand, 99... Jack

Claims (5)

高架橋のラーメン構造を構築する方法において、
複数本の柱を間隔を置いて立設する工程と、
複数のプレキャストコンクリート部材を前記柱の配列方向に配列するよう前記柱の上方に揚重し、前記プレキャストコンクリート部材を接続することによって、前記柱に対応する複数の仕口部とそれら仕口部を接続する横梁とを有する接続体を形成し、前記接続体の仕口部を前記柱の上方に配置し、前記接続体の横梁を前記柱の上方の前記柱間に配置する接続工程と、
前記接続工程を行った後に、前記接続体を下降させて、前記仕口部の下端部と前記柱の上端部のうち一方から突出した主筋を他方に設けられたスリーブ継手に挿入する下降工程と、を備えることを特徴とするラーメン構造の構築方法。
In the method of constructing a viaduct ramen structure,
A process of standing a plurality of pillars at intervals,
A plurality of precast concrete members are lifted above the columns so as to be arranged in the arrangement direction of the columns, and by connecting the precast concrete members, a plurality of joint portions corresponding to the columns and those joint portions are formed. A connecting step of forming a connecting body having a horizontal beam to be connected, arranging the joint portion of the connecting body above the pillar, and arranging the horizontal beam of the connecting body between the pillars above the pillar,
After performing the connecting step, the connecting body is lowered, and a lowering step of inserting a main bar protruding from one of the lower end of the joint portion and the upper end of the column into a sleeve joint provided on the other. A method for constructing a ramen structure, comprising:
前記接続工程では、前記柱の側面に設置された基台上に駒台を複数段に設置するとともに、架台を前記柱間に掛け渡すように前記駒台上に設置した上で、前記接続体を前記架台上に設置し、
前記下降工程では、前記基台上に設置したジャッキによって前記架台及び前記接続体を支持した状態で、前記駒台を一段ずつ取り外しながら前記ジャッキにより前記架台及び前記接続体を下降させることを特徴とする請求項1に記載のラーメン構造の構築方法。
In the connecting step, the bridge base is installed in a plurality of stages on the base installed on the side surface of the pillar, and the mount is installed on the bridge base so as to be bridged between the pillars, and then the connecting body is installed. Is installed on the mount,
In the lowering step, in a state in which the gantry and the connection body are supported by a jack installed on the base, the gantry and the connection body are lowered by the jack while removing the frame base step by step. The method for constructing a ramen structure according to claim 1.
前記柱の数が2本であり、
前記プレキャストコンクリート部材のうち両側の第一プレキャストコンクリート部材は、前記仕口部と、前記仕口部から延出した梁部とを有し、
前記接続工程では、前記プレキャストコンクリート部材のうち前記第一プレキャストコンクリート部材の間の第二プレキャストコンクリート部材を前記梁部間に接続することを特徴とする請求項1又は2に記載のラーメン構造の構築方法。
The number of pillars is two,
The first precast concrete members on both sides of the precast concrete member have the joint portion and a beam portion extending from the joint portion,
The construction of the rigid frame structure according to claim 1 or 2, wherein in the connecting step, a second precast concrete member between the first precast concrete members among the precast concrete members is connected between the beam portions. Method.
前記柱の数が2本であり、前記プレキャストコンクリート部材の数が2体であり、前記プレキャストコンクリート部材は、前記仕口部と、前記仕口部から延出した梁部とを有し、
前記接続工程では、前記プレキャストコンクリート部材の前記梁部同士を接続することを特徴とする請求項1又は2に記載のラーメン構造の構築方法。
The number of the pillars is two, the number of the precast concrete member is two, the precast concrete member has the joint portion, a beam portion extending from the joint portion,
The method for constructing a rigid frame structure according to claim 1 or 2, wherein in the connecting step, the beam portions of the precast concrete member are connected to each other.
前記下降工程後に、前記スリーブ継手にグラウトを充填するとともに、前記仕口部の下端面と前記柱の上端面との間にグラウトを充填するグラウト充填工程を更に備える請求項1から4の何れか一項に記載のラーメン構造の構築方法。 5. The method according to claim 1, further comprising a grout filling step of filling the sleeve joint with grout after the lowering step and filling the grout between the lower end surface of the joint portion and the upper end surface of the column. The method for constructing a ramen structure according to one item.
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