JP6889596B2 - Bridge superstructure support - Google Patents

Bridge superstructure support Download PDF

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JP6889596B2
JP6889596B2 JP2017082537A JP2017082537A JP6889596B2 JP 6889596 B2 JP6889596 B2 JP 6889596B2 JP 2017082537 A JP2017082537 A JP 2017082537A JP 2017082537 A JP2017082537 A JP 2017082537A JP 6889596 B2 JP6889596 B2 JP 6889596B2
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overhanging member
overhanging
superstructure
base plate
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JP2018178620A (en
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木部　洋
洋 木部
督介 中井
督介 中井
浩 藤塚
浩 藤塚
創三 松井
創三 松井
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SE Corp
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Description

本発明は橋軸方向の端部が下部構造の側面から張り出した部分に支持される上部構造を下部構造に支持させる橋梁上部構造の支持装置に関するものである。 The present invention relates to a bridge superstructure support device that allows a substructure to support a superstructure whose end in the bridge axial direction is supported by a portion projecting from a side surface of the substructure.

橋梁の上部構造の橋軸方向端部を下部構造の、対向する下部構造側を向いた側面から張り出した部分に支持させる場合、上部構造の端部は下部構造の側面に突設されたブラケットに支持される形になる（特許文献１〜３参照）。 When the bridge axial end of the superstructure of the bridge is supported by a portion of the substructure that overhangs from the side facing the opposite substructure, the end of the superstructure is a bracket protruding from the side of the substructure. It becomes a supported form (see Patent Documents 1 to 3).

ブラケットは下部構造の側面から張り出した部分で上部構造を支持する役目を果たすため、主には上部構造の自重による曲げモーメントを負担しながら、下部構造に伝達できればよい。この主たる機能が発揮されるよう、ブラケットは基本的に下部構造の側面にアンカーボルトによって固定されるベースプレートと、ベースプレートの表面に突設される、鉛直方向と水平方向を向いた２方向のプレートから構成される（特許文献１〜３参照）。 Since the bracket serves to support the superstructure at a portion protruding from the side surface of the substructure, it is sufficient that the bracket can be transmitted to the substructure while mainly bearing the bending moment due to the weight of the superstructure. To achieve this main function, the bracket basically consists of a base plate that is fixed to the side of the substructure by anchor bolts and a two-way plate that protrudes from the surface of the base plate and faces vertically and horizontally. It is configured (see Patent Documents 1 to 3).

特開２００８−１１５６３９号公報（段落００２２〜００２５、図１、図２）Japanese Unexamined Patent Publication No. 2008-115636 (paragraphs 0022 to 0025, FIGS. 1, 2) 特開２０１０−１５９５６８号公報（段落００２９〜００３０、図３）Japanese Unexamined Patent Publication No. 2010-159568 (paragraphs 0029 to 0030, FIG. 3) 特開２０１４−９１９７９号公報（段落００４７〜００６２、図４、図５）Japanese Unexamined Patent Publication No. 2014-91979 (paragraphs 0047-0062, FIGS. 4, 5)

ブラケットは上部構造に橋軸方向の水平力が作用したときにも、その水平力を負担しながら２方向のプレートとアンカーボルトを通じて下部構造に伝達することができる。しかしながら、上部構造に橋軸方向に直交等、交差する方向の水平力が作用したときの、橋軸方向に平行な軸の回りに生じる捩りモーメントに対しては十分な抵抗力を保有していない可能性がある。 Even when a horizontal force in the bridge axis direction acts on the upper structure, the bracket can transmit the horizontal force to the lower structure through the plate and the anchor bolt in two directions while bearing the horizontal force. However, it does not have sufficient resistance to the torsional moment generated around the axis parallel to the bridge axis when a horizontal force in the intersecting direction, such as orthogonal to the bridge axis, acts on the superstructure. there is a possibility.

例えばブラケットが上記のように鉛直方向と水平方向の２方向を向くプレートからなる場合（特許文献１〜３）、ブラケットは開放断面形状であることで、橋軸方向の回りの捩りモーメントに対する捩り剛性が乏しいため、捩りモーメントの作用方向に変形する可能性がある。 For example, when the bracket is composed of plates facing in two directions, the vertical direction and the horizontal direction as described above (Patent Documents 1 to 3), the bracket has an open cross-sectional shape, so that the bracket has a torsional rigidity with respect to a torsional moment in the direction of the bridge axis. There is a possibility of deformation in the direction of action of the torsional moment due to the lack of.

本発明は上記背景より、上部構造に橋軸方向に直交等する方向の水平力が作用したときの捩りモーメントによる変形に対する安定性の高い橋梁上部構造の支持装置を提案するものである。 From the above background, the present invention proposes a support device for a bridge superstructure having high stability against deformation due to a torsional moment when a horizontal force in a direction orthogonal to the bridge axis direction acts on the superstructure.

請求項１に記載の発明の橋梁上部構造の支持装置は、橋梁の下部構造の、対向する下部構造側を向いた側面から橋軸方向へ張り出し、上部構造の橋軸方向の端部を支持する支持装置であり、
前記下部構造の前記側面に重なって接合されるベースプレートと、このベースプレートの表面に突設され、前記対向する下部構造側へ張り出し、前記上部構造を直接、もしくは間接的に支持する張出部材とを備え、
前記張出部材は軸方向の全長に亘り、閉鎖断面をなし、
前記張出部材の、前記対向する下部構造側の端面、もしくは端部に閉塞板が接合され、この下部構造側の端面、もしくは端部が閉塞されていることを構成要件とする。 The support device for the bridge superstructure of the invention according to claim 1 projects from the side surface of the substructure of the bridge facing the opposite substructure side in the direction of the bridge axis and supports the end portion of the superstructure in the bridge axis direction. It is a support device
A base plate that is overlapped and joined to the side surface of the substructure, and an overhanging member that projects from the surface of the base plate and projects to the opposite substructure side to directly or indirectly support the superstructure. Prepare,
The overhanging member has a closed cross section over the entire length in the axial direction .
It is a constituent requirement that a closing plate is joined to the end face or end portion of the overhanging member on the opposite lower structure side, and the end face or end portion on the lower structure side is closed.

「下部構造の、対向する下部構造側を向いた側面」とは、図１に示すように下部構造９の側面の内、橋軸方向に対向する（隣接する）下部構造９側を向いた側面９１を指す。下部構造９には橋脚と橋台が含まれる。下部構造９の側面９１は鉛直面をなす場合と鉛直面に対して傾斜する場合がある。上部構造１０の橋軸方向の端部が下部構造９の側面９１から張り出した張出部材３に支持されれば、上部構造１０の形態（種類）は問われない。図面では上部構造１０が水管橋の水管１０１である場合の例を示しているが、上部構造１０は橋桁の場合もある。 As shown in FIG. 1, the "side surface of the substructure facing the opposite substructure side" is a side surface of the substructure 9 facing the bridge axis direction (adjacent) facing the substructure 9 side. Refers to 91. The substructure 9 includes piers and abutments. The side surface 91 of the substructure 9 may have a vertical surface or may be inclined with respect to the vertical surface. The form (type) of the superstructure 10 is not limited as long as the end portion of the superstructure 10 in the bridge axis direction is supported by the overhanging member 3 projecting from the side surface 91 of the substructure 9. Although the drawing shows an example in which the superstructure 10 is the water pipe 101 of the aqueduct, the superstructure 10 may be a bridge girder.

「張出部材が軸方向の全長に亘り、閉鎖断面をなしている」とは、張出部材４の軸方向全長の、軸（材軸）に直交する方向の断面が閉鎖した形状をしていることを言い、張出部材４の軸方向各部の断面形状は問われない。張出部材４の軸方向は主に橋軸方向である。 "The overhanging member has a closed cross section over the entire length in the axial direction" means that the cross section of the total length of the overhanging member 4 in the axial direction in the direction orthogonal to the axis (material axis) is closed. The cross-sectional shape of each part of the overhanging member 4 in the axial direction does not matter. The axial direction of the overhanging member 4 is mainly the bridge axial direction.

張出部材４の断面形状は上部構造１０を直接、支持する上では図示するような箱形（方形）断面であることが適切であるが、必ずしもその必要はなく、張出部材４の上部に、上部構造１０を受ける支持部材６が固定されることもあるため（請求項３）、円形、もしくは楕円、または多角形断面であることもある。張出部材４の軸に直交する方向の断面積が軸方向に一定である必要もなく、平等強さの梁のようにベースプレート２側から先端側へかけて断面積が次第に減少する形状に形成されることもある。 It is appropriate that the cross-sectional shape of the overhanging member 4 is a box-shaped (square) cross-sectional shape as shown in the drawing for directly supporting the superstructure 10, but it is not always necessary, and the overhanging member 4 has an upper portion. Since the support member 6 that receives the superstructure 10 may be fixed (claim 3 ), it may have a circular, elliptical, or polygonal cross section. The cross-sectional area in the direction orthogonal to the axis of the overhanging member 4 does not have to be constant in the axial direction, and is formed into a shape in which the cross-sectional area gradually decreases from the base plate 2 side to the tip side like a beam of equal strength. It may be done.

張出部材４が軸方向の全長に亘り、閉鎖断面形状であることで、軸の回りの捩りモーメントに対する捩り剛性が開放断面形状の場合より高まるため、張出部材４の上に載る上部構造１０の端部に上部構造１０の軸方向（橋軸方向）に直交等、交差する方向に水平力が作用し、張出部材４に軸の回りに捩りモーメントが作用したときの抵抗力が開放断面形状の場合より上昇する。 Since the overhanging member 4 has a closed cross-sectional shape over the entire length in the axial direction, the torsional rigidity with respect to the torsional moment around the shaft is higher than that in the case of the open cross-sectional shape. A horizontal force acts on the end of the upper structure 10 in the intersecting direction, such as orthogonal to the axial direction (bridge axis direction), and the resistance force when a twisting moment acts around the axis on the overhanging member 4 is an open cross section. It rises more than in the case of shape.

只、張出部材４の先端部である対向する下部構造９側の端面が開放し、閉じていない場合には、端面が捩り変形に対して拘束されていないために、端面の捩り剛性が低い状態にあり、張出部材４が軸回りに捩りモーメントを受けたときに端面付近が捩り変形を生じ易い。 However, when the end face on the opposite lower structure 9 side, which is the tip of the overhanging member 4, is open and not closed, the end face is not constrained by torsional deformation, so that the torsional rigidity of the end face is low. In this state, when the overhanging member 4 receives a torsional moment around the axis, the vicinity of the end face is likely to undergo torsional deformation.

そこで、張出部材４の、対向する下部構造９側の端面に閉塞板５を重ねるか、端部の内周側に閉塞板５を配置して接合し、張出部材４の端面、または端部を閉塞させれば（請求項１）、張出部材４端面の、捩り変形に対する拘束効果が高まる。この結果、張出部材４端面の捩り剛性を開放している場合より上昇させることができるため、捩りモーメントによる張出部材４の端面付近の捩り変形を抑制することが可能になる。閉塞板５は主に溶接により張出部材４の端面、または端部に一体化する。 Therefore, the closing plate 5 is placed on the end surface of the overhanging member 4 on the opposite lower structure 9 side, or the closing plate 5 is arranged and joined on the inner peripheral side of the end portion, and the end surface or the end of the overhanging member 4 is joined. If the portion is closed (claim 1 ), the effect of restraining the end face of the overhanging member 4 against torsional deformation is enhanced. As a result, since the torsional rigidity of the end face of the overhanging member 4 can be increased as compared with the case where the end face of the overhanging member 4 is open, it is possible to suppress the torsional deformation of the end face of the overhanging member 4 due to the twisting moment. The block plate 5 is integrated with the end face or the end portion of the overhanging member 4 mainly by welding.

張出部材４が捩りモーメントを受けたとき、捩りモーメントは張出部材４が突設されたベースプレート２を下部構造９に固定するアンカーボルトやアンカー等の定着材３が負担し、下部構造９に伝達する。定着材３は張出部材４に作用する捩りモーメントに対し、軸に直交する方向のせん断力を負担することにより抵抗する。定着材３は張出部材４の軸の周囲に分散して配置されることで、複数本の定着材３がせん断力を分担しながら、捩りモーメントを下部構造９に伝達する。 When the overhanging member 4 receives a torsional moment, the torsional moment is borne by the anchor bolts, anchors, and other fixing materials 3 that fix the base plate 2 on which the overhanging member 4 is projected to the lower structure 9, and the lower structure 9 bears the twisting moment. introduce. The fixing material 3 resists the twisting moment acting on the overhanging member 4 by bearing a shearing force in the direction orthogonal to the axis. By arranging the fixing materials 3 in a dispersed manner around the shaft of the overhanging member 4, the plurality of fixing materials 3 transmit the twisting moment to the lower structure 9 while sharing the shearing force.

このとき、張出部材４の軸に関して点対称の位置にある２本の定着材３、３が対になるようにせん断力を負担することにより捩りモーメントに抵抗するが、この抵抗力は張出部材４の軸からの距離（腕の長さ）が大きい程、大きいため、張出部材４の軸から定着材３の軸までの距離をより大きく確保することが有効である。 At this time, the torsional moment is resisted by bearing a shearing force so that the two fixing members 3 and 3 located at point-symmetrical positions with respect to the axis of the overhanging member 4 are paired, and this resistance force is overhanging. The larger the distance from the shaft of the member 4 (the length of the arm), the larger the distance. Therefore, it is effective to secure a larger distance from the shaft of the overhanging member 4 to the shaft of the fixing member 3.

そこで、ベースプレート２の面積を張出部材４の軸に直交する方向の断面積より大きくし、ベースプレート２を下部構造９の側面９１に固定する定着材３を張出部材４の外周側に配置すれば（請求項２）、張出部材４の軸から定着材３の軸までの距離をより拡大することが可能になる。「ベースプレート２の面積」は張出部材４の軸方向にベースプレート２を見たときの面積を言う。張出部材４の周囲には２本以上の定着材３が分散して配置されるが、張出部材４の軸に関して対称位置の２本の定着材３、３が対になるように抵抗する。 Therefore, the area of the base plate 2 is made larger than the cross-sectional area in the direction orthogonal to the axis of the overhanging member 4, and the fixing material 3 for fixing the base plate 2 to the side surface 91 of the lower structure 9 is arranged on the outer peripheral side of the overhanging member 4. For example (claim 2 ), the distance from the shaft of the overhanging member 4 to the shaft of the fixing material 3 can be further increased. The "area of the base plate 2" refers to the area when the base plate 2 is viewed in the axial direction of the overhanging member 4. Two or more fixing members 3 are dispersedly arranged around the overhanging member 4, but the two fixing members 3 and 3 at symmetrical positions with respect to the axis of the overhanging member 4 resist so as to be paired. ..

この場合、ベースプレート２の面積が張出部材４の断面積より大きいことで、図３に示すようにベースプレート２の面積が張出部材４の断面積内に納まる場合より定着材３の設置本数を増やすことができるため、捩りモーメントに対する定着材３全体での抵抗力を増大させることが可能になる。このことは、張出部材４に作用する軸回りの捩りモーメントが一定であれば、ベースプレート２の面積が張出部材４の断面積内に納まる場合との対比では１本当たりの定着材３の捩りモーメントに対する抵抗力としてのせん断力の負担が低下することでもあるため、定着材３のせん断抵抗力を決める断面積を小さくする、すなわち定着材３の寸法（サイズ）を小さく抑えることも可能になる。 In this case, since the area of the base plate 2 is larger than the cross-sectional area of the overhanging member 4, the number of fixing members 3 to be installed is larger than when the area of the base plate 2 is within the cross-sectional area of the overhanging member 4 as shown in FIG. Since it can be increased, it is possible to increase the resistance of the fixing material 3 as a whole to the twisting moment. This means that if the axial torsional moment acting on the overhanging member 4 is constant, the fixing material 3 per one fixing material 3 is compared with the case where the area of the base plate 2 is within the cross-sectional area of the overhanging member 4. Since the load of the shearing force as the resistance to the torsional moment is also reduced, it is possible to reduce the cross-sectional area that determines the shearing resistance of the fixing material 3, that is, to keep the size of the fixing material 3 small. Become.

張出部材が特許文献１〜３のように２方向を向いたプレートからなり、開放断面である場合、ベースプレートは張出部材の下部構造側の端面を覆う面積を持てばよいことから、ベースプレートの面積を張出部材の断面積より大きくしようとする理由付けがない。結果的にアンカーボルトは張出部材の断面内に配置されることになるため、張出部材の軸からアンカーボルトの軸までの距離は大きくならない。 When the overhanging member is composed of plates facing in two directions as in Patent Documents 1 to 3 and has an open cross section, the base plate only needs to have an area covering the end face on the lower structure side of the overhanging member. There is no reason to try to make the area larger than the cross-sectional area of the overhanging member. As a result, the anchor bolts are arranged within the cross section of the overhanging member, so that the distance from the shaft of the overhanging member to the shaft of the anchor bolt does not increase.

これに対し、本発明では張出部材４が閉鎖断面であることから、ベースプレート２の面積を張出部材４の断面積以下にすることは、ベースプレート２に張出部材４を接合（固定）した状態では定着材３を下部構造９に挿入することができないことを意味するため、張出部材４が閉鎖断面であることの形態上の理由からも、ベースプレート２の面積を張出部材４の断面積より大きくすることが合理的である。 On the other hand, in the present invention, since the overhanging member 4 has a closed cross section, making the area of the base plate 2 smaller than the cross-sectional area of the overhanging member 4 joins (fixes) the overhanging member 4 to the base plate 2. Since it means that the fixing material 3 cannot be inserted into the lower structure 9 in the state, the area of the base plate 2 is cut off from the overhanging member 4 for the morphological reason that the overhanging member 4 has a closed cross section. It is rational to make it larger than the area.

この形態上の理由から、本発明ではベースプレート２の面積を張出部材４の断面積より大きくできる自由さがあり、ベースプレート２の面積を張出部材４の断面積より大きくすることで、定着材３を張出部材４の断面の外側に配置することができる。この結果、アンカーボルトが張出部材４の断面内に配置される場合より張出部材４の軸から定着材３の軸までの距離（腕の長さ）をより大きく確保することができ、捩りモーメントに抵抗する腕の長さが大きくなるため、捩りモーメントに対する抵抗力が大きくなる。 For this morphological reason, in the present invention, there is a freedom that the area of the base plate 2 can be made larger than the cross-sectional area of the overhanging member 4, and by making the area of the base plate 2 larger than the cross-sectional area of the overhanging member 4, the fixing material 3 can be arranged outside the cross section of the overhanging member 4. As a result, it is possible to secure a larger distance (arm length) from the axis of the overhanging member 4 to the axis of the fixing member 3 than when the anchor bolt is arranged in the cross section of the overhanging member 4, and the twist. Since the length of the arm that resists the moment increases, the resistance to the twisting moment increases.

張出部材４の上側には上部構造１０の端部が直接、もしくは間接的に載置され、支持されるが、張出部材４が箱形断面でないような場合、または箱形断面である場合も含め、張出部材４の上部には図１に示すように上部構造１０を受けるための支持部材６が固定されることが適切である（請求項３）。上部構造１０が上記のように図示するような水管橋の水管１０１である場合、上部構造１０の橋軸方向の端部は水管１０１の端部である。
When the end portion of the superstructure 10 is directly or indirectly placed and supported on the upper side of the overhanging member 4, but the overhanging member 4 does not have a box-shaped cross section, or has a box-shaped cross section. It is appropriate that a support member 6 for receiving the superstructure 10 is fixed to the upper part of the overhanging member 4 as shown in FIG. 1 (claim 3 ). When the superstructure 10 is a water pipe 101 of a water pipe bridge as shown above, the end portion of the superstructure 10 in the bridge axial direction is the end portion of the water pipe 101.

この場合、張出部材４の上部に支持部材６が固定されることで、張出部材４の断面形状、または張出部材４上部の形状に無関係に上部構造１０の支持に適した形状の支持部材６を配置することができる。この結果、上部構造１０の支持のために張出部材４の断面形状が制約を受ける必要がなくなるため、上部構造１０に作用する水平力に起因し、張出部材４に生じる捩りモーメントに抵抗することに適した、あるいは有利な断面形状に張出部材４を形成することが可能になる。この場合、張出部材４は必ずしも箱形断面形状に形成される必要がないため、上記したように箱形以外の断面形状にも形成し易くなる。 In this case, by fixing the support member 6 to the upper part of the overhanging member 4, the support having a shape suitable for supporting the superstructure 10 is supported regardless of the cross-sectional shape of the overhanging member 4 or the shape of the upper part of the overhanging member 4. The member 6 can be arranged. As a result, since it is not necessary to restrict the cross-sectional shape of the overhanging member 4 for supporting the superstructure 10, it resists the torsional moment generated in the overhanging member 4 due to the horizontal force acting on the superstructure 10. It becomes possible to form the overhanging member 4 in a cross-sectional shape suitable for or advantageous to the above. In this case, since the overhanging member 4 does not necessarily have to be formed in a box-shaped cross-sectional shape, it can be easily formed in a cross-sectional shape other than the box-shaped as described above.

下部構造の側面に接合されるベースプレートの表面に突設され、上部構造を支持する張出部材が軸方向の全長に亘り、閉鎖断面をなすため、張出部材の軸の回りの捩りモーメントに対する捩り剛性を開放断面形状の場合より高めることができる。この結果、張出部材の上に載る上部構造の端部に上部構造の軸方向に直交等する方向に水平力が作用し、張出部材に軸の回りに捩りモーメントが作用したときの抵抗力が開放断面形状の場合より上昇させることができる。 Since the overhanging member projecting from the surface of the base plate joined to the side surface of the substructure and supporting the superstructure forms a closed cross section over the entire length in the axial direction, the overhanging member is twisted with respect to the torsional moment around the axis. The rigidity can be increased as compared with the case of the open cross-sectional shape. As a result, a horizontal force acts on the end of the upper structure resting on the overhanging member in a direction orthogonal to the axial direction of the upper structure, and a resistance force when a twisting moment acts around the axis on the overhanging member. Can be raised more than in the case of an open cross-sectional shape.

下部構造の側面に接合されたベースプレートに固定された張出部材が上部構造を支持している状況を示した、上部構造の幅方向に見た縦断面図であり、図２のａ−ａ線断面図である。It is a vertical cross-sectional view in the width direction of the superstructure showing the situation where the overhanging member fixed to the base plate joined to the side surface of the superstructure supports the superstructure, and is a vertical cross-sectional view taken along the line aa of FIG. It is a cross-sectional view. 図１のｂ−ｂ線矢視図である。It is a bb line arrow view of FIG. 図１のｃ−ｃ線断面図である。FIG. 5 is a cross-sectional view taken along the line cc of FIG. 図１のｄ−ｄ線断面図である。FIG. 5 is a cross-sectional view taken along the line dd of FIG. （ａ）は図１に示す受け部材の内、接続材を示した立面図、（ｂ）は（ａ）のｘ−ｘ線断面図である。(A) is an elevational view showing a connecting member among the receiving members shown in FIG. 1, and (b) is a sectional view taken along line xx of (a). （ａ）は図１に示す受け部材の内、固定材を示した（ｂ）のｙ−ｙ線断面図、（ｂ）は（ａ）の底面図である。(A) is a sectional view taken along line yy of (b) showing a fixing material among the receiving members shown in FIG. 1, and (b) is a bottom view of (a).

図１、図２は橋梁の下部構造９の、対向する下部構造９側を向いた側面９１から橋軸方向へ張り出し、上部構造１０の橋軸方向の端部を支持する支持装置１の構成例を示す。支持装置１は下部構造９の側面９１に重なって接合されるベースプレート２と、ベースプレート２の表面に突設され、対向する下部構造９１側へ張り出し、上部構造１０を直接、もしくは間接的に支持する張出部材４とを備え、張出部材４は軸方向の全長に亘り、閉鎖断面をなしている。 1 and 2 show a configuration example of a support device 1 that projects from the side surface 91 of the lower structure 9 of the bridge facing the opposite lower structure 9 side in the direction of the bridge axis and supports the end portion of the upper structure 10 in the direction of the bridge axis. Is shown. The support device 1 projects from the surface of the base plate 2 and the base plate 2 which is overlapped and joined to the side surface 91 of the lower structure 9 and projects toward the opposite lower structure 91 side to directly or indirectly support the upper structure 10. The overhanging member 4 is provided, and the overhanging member 4 has a closed cross section over the entire length in the axial direction.

図面では橋梁が水管橋の場合の例を示しているが、上部構造１０の橋軸方向の端部が下部構造９の側面９１から張り出した部分に支持される形態であれば、橋梁（上部構造１０）の形態は問われない。また下部構造９と上部構造１０は新設で構築される場合と、既設の場合があり、既設の場合、下部構造９の側面９１に固定されていた既設の張出部材は撤去され、新たに張出部材４が設置される。橋梁が水管橋の場合、上部構造１０は水管１０１である。 The drawing shows an example in which the bridge is an aqueduct, but if the end portion of the superstructure 10 in the bridge axial direction is supported by a portion protruding from the side surface 91 of the substructure 9, the bridge (superstructure). The form of 10) does not matter. Further, the lower structure 9 and the upper structure 10 may be newly constructed or already installed. In the existing case, the existing overhanging member fixed to the side surface 91 of the lower structure 9 is removed and newly stretched. The output member 4 is installed. When the bridge is an aqueduct, the superstructure 10 is a water pipe 101.

ベースプレート２は表面に張出部材４の下部構造９側の端部が突き合わせられ、接合されたときに、少なくとも張出部材４の端部を閉塞できるだけの平面積を持ち、張出部材４が接合された状態で張出部材４の断面との干渉がない位置に配置されるアンカーボルト、アンカー等の定着材３が下部構造９に定着されることにより下部構造９に固定される。下部構造９が既設の場合、定着材３は既設のアンカーが挿入されていた箇所を利用できる場合以外、新たに形成された削孔９２内に挿入され、接着剤やモルタル等の充填材によって下部構造９に定着される。 The base plate 2 has a flat area sufficient to close at least the ends of the overhanging members 4 when the ends of the overhanging members 4 on the lower structure 9 side are abutted against the surface and the overhanging members 4 are joined. Anchor bolts, anchors and other fixing materials 3 arranged at positions where there is no interference with the cross section of the overhanging member 4 are fixed to the lower structure 9 by being fixed to the lower structure 9. When the lower structure 9 is already installed, the fixing material 3 is inserted into the newly formed drilling 92, except when the existing anchor can be used, and the lower part is provided with a filler such as an adhesive or mortar. It is fixed to the structure 9.

張出部材４は軸方向の全長に亘り、閉鎖断面形状をすればよく、軸に直交する断面の断面形状は問われず、軸方向の全長に亘って一様断面である必要もないが、図面では張出部材４が下部構造９の側面９１から張り出した状態での上部構造１０の支持のし易さから、張出部材４を箱形断面形状に形成している。 The overhanging member 4 may have a closed cross-sectional shape over the entire length in the axial direction, and the cross-sectional shape of the cross section perpendicular to the axis does not matter, and the overhanging member 4 does not have to have a uniform cross-sectional shape over the entire length in the axial direction. Then, the overhanging member 4 is formed in a box-shaped cross-sectional shape because it is easy to support the upper structure 10 in a state where the overhanging member 4 projects from the side surface 91 of the lower structure 9.

この場合、張出部材４は幅と高さを自由に決められるよう、基本的に鉛直方向を向き、水平方向に距離を置いて対向する鉛直プレート４１、４１と、鉛直プレート４１の鉛直方向両端部に一体化し、鉛直方向に距離を置いて対向する水平プレート４２、４２から箱形に組み立てられる。但し、張出部材４が箱形の形状をする場合、２方向のプレートは必ずしも鉛直方向と水平方向を向くとは限らない。 In this case, the overhanging member 4 basically faces the vertical direction and faces the vertical plates 41 and 41 at a horizontal distance so that the width and height can be freely determined, and both ends of the vertical plate 41 in the vertical direction. It is integrated into the part and assembled into a box shape from the horizontal plates 42, 42 facing each other at a distance in the vertical direction. However, when the overhanging member 4 has a box shape, the plates in two directions do not always face in the vertical direction and the horizontal direction.

また対向する鉛直プレート４１、４１間、または水平プレート４２、４２間に中間のプレートがいずれかに平行に補助的に配置されることもある。張出部材４が箱形の断面形状をする場合、張出部材４には角形鋼管が使用されることもある。箱形以外の断面形状をする場合、張出部材４には（円形）鋼管等が、または複数の形鋼が組み合わせられた鋼材等使用されることもある。 Further, an intermediate plate may be auxiliaryly arranged in parallel with any of the vertical plates 41 and 41 facing each other, or between the horizontal plates 42 and 42. When the overhanging member 4 has a box-shaped cross-sectional shape, a square steel pipe may be used for the overhanging member 4. When the cross-sectional shape is other than the box shape, a (circular) steel pipe or the like may be used for the overhanging member 4, or a steel material or the like in which a plurality of shaped steels are combined may be used.

鉛直プレート４１、４１は主に上部構造１０の鉛直荷重によるせん断力を、水平プレート４２、４２は主に上部構造１０の鉛直荷重による曲げモーメントを負担するが、互いに接合されて閉鎖断面形状の張出部材４を構成することで、上部構造１０に橋軸方向に直交等、交差する方向の水平力が作用したときの、張出部材４の軸の回りに生じる捩りモーメントに抵抗する。 The vertical plates 41 and 41 mainly bear the shearing force due to the vertical load of the upper structure 10, and the horizontal plates 42 and 42 mainly bear the bending moment due to the vertical load of the upper structure 10, but they are joined to each other and have a closed cross-sectional shape. By constructing the overhanging member 4, it resists the torsional moment generated around the axis of the overhanging member 4 when a horizontal force in an intersecting direction such as orthogonal to the bridge axis direction acts on the superstructure 10.

鉛直プレート４１、４１と水平プレート４２、４２のベースプレート２側の端面は共に、ベースプレート２の表面に溶接等により接合され、互いに直交等、交差する鉛直プレート４１、４１と水平プレート４２、４２も溶接等により互いに接合される。図面では上部構造１０としての水管１０１を上方から押さえ込むように保持しながら、張出部材４に支持させる保持材８の脚部８１が軸方向の幅方向に並列して形成されることに対応し、張出部材４の幅である水平プレート４２の幅を張出部材４の高さである鉛直プレート４１の幅より大きくしているが、水平プレート４２と鉛直プレート４１の幅は任意である。「溶接等により」とは、各プレート４１、４２がベースプレート２に鋼材とボルトを介して接合される場合がある意味である。 Both the vertical plates 41, 41 and the end faces of the horizontal plates 42, 42 on the base plate 2 side are joined to the surface of the base plate 2 by welding or the like, and the vertical plates 41, 41 and the horizontal plates 42, 42 that intersect each other at right angles to each other are also welded. They are joined to each other by such means. In the drawing, the legs 81 of the holding member 8 to be supported by the overhanging member 4 are formed in parallel in the width direction in the axial direction while holding the water pipe 101 as the superstructure 10 so as to be pressed from above. The width of the horizontal plate 42, which is the width of the overhanging member 4, is made larger than the width of the vertical plate 41, which is the height of the overhanging member 4, but the widths of the horizontal plate 42 and the vertical plate 41 are arbitrary. “By welding or the like” means that the plates 41 and 42 may be joined to the base plate 2 via steel materials and bolts.

張出部材４の先端側である、対向する下部構造９側の端部が開放した状態のままでは、張出部材４に作用する捩りモーメントを受けたときに、開放した先端側の拘束がないために捩り変形を起こす可能性がある。このことから、開放した先端部分の捩り変形を生じにくくする目的で、張出部材４の先端側の端面に図１、図２に示すように閉塞板５を張出部材４の軸方向に重ねるか、先端側の端部の内周面に密着（内接）するように配置し、接合することにより張出部材４の端面、または端部が閉塞させられる。閉塞板５は開放している場合の張出部材４の先端側の端面、または端部を閉塞することで、鉛直プレート４１と水平プレート４２の端部を変形に対して拘束し、張出部材４の先端部分の捩り剛性を高める働きをする。 If the end on the opposite lower structure 9 side, which is the tip side of the overhang member 4, remains open, there is no restraint on the open tip side when a twisting moment acting on the overhang member 4 is received. Therefore, it may cause twisting deformation. For this reason, for the purpose of making it difficult for the open tip portion to be twisted and deformed, the closing plate 5 is overlapped on the end surface of the overhanging member 4 on the tip end side in the axial direction of the overhanging member 4 as shown in FIGS. 1 and 2. Alternatively, the end surface or the end portion of the overhanging member 4 is closed by arranging and joining so as to be in close contact (inscribed) with the inner peripheral surface of the end portion on the tip end side. The closing plate 5 closes the end face or the end portion of the overhanging member 4 on the distal end side when it is open, thereby restraining the end portions of the vertical plate 41 and the horizontal plate 42 against deformation, and the overhanging member. It works to increase the torsional rigidity of the tip of 4.

ベースプレート２には張出部材４のベースプレート２側の端面全体が突き当たった状態で張出部材４が接合されればよい。張出部材４はベースプレート２側の端面から先端側の端面までの全長に亘って閉鎖断面形状をするから、ベースプレート２は張出部材４のベースプレート２側の端面を閉塞しながら、張出部材４に接合されることになる。但し、張出部材４が閉鎖断面形状であるから、ベースプレート２の面積が張出部材４の根本側（ベースプレート２側）の端面の断面積と同等程度であれば、張出部材４がベースプレート２に接合された（一体化した）状態では定着材３を用いてベースプレート２を下部構造９に接合することができない。 The overhanging member 4 may be joined to the base plate 2 with the entire end surface of the overhanging member 4 on the base plate 2 side abutting against the base plate 2. Since the overhanging member 4 has a closed cross-sectional shape over the entire length from the end face on the base plate 2 side to the end face on the tip end side, the base plate 2 closes the end face on the base plate 2 side of the overhanging member 4, and the overhanging member 4 Will be joined to. However, since the overhanging member 4 has a closed cross-sectional shape, if the area of the base plate 2 is about the same as the cross-sectional area of the end face on the root side (base plate 2 side) of the overhanging member 4, the overhanging member 4 is the base plate 2. In the state of being joined (integrated) to the base plate 2, the base plate 2 cannot be joined to the lower structure 9 by using the fixing material 3.

この関係で、ベースプレート２を下部構造９に先行して接合した後にベースプレート２に張出部材４を接合する場合以外、ベースプレート２は図１、図３、図４に示すように張出部材４の根本側の、軸に直交する方向の断面積より大きい面積が与えられ、ベースプレート２の、張出部材４の外周面から張り出した帯状部分にアンカーボルト等の定着材３が配置される。 In this relationship, the base plate 2 is the overhanging member 4 as shown in FIGS. 1, 3, and 4, except when the overhanging member 4 is joined to the base plate 2 after the base plate 2 is joined in advance of the lower structure 9. An area larger than the cross-sectional area on the root side in the direction orthogonal to the axis is given, and the fixing material 3 such as an anchor bolt is arranged on the strip-shaped portion of the base plate 2 overhanging from the outer peripheral surface of the overhanging member 4.

図面では張出部材４が２枚の鉛直プレート４１と２枚の水平プレート４２から組み立てられ、軸方向の全長に亘って一様断面に形成されていることから、ベースプレート２は張出部材４の外周面からベースプレート２の縁（外周）までに少なくとも定着材３を挿通させることができるだけの距離（突出幅）を確保できる面積を持つ。このベースプレート２の、張出部材４の外周面から突出し、張出部材４を周回する帯状部分に、複数本の定着材３が張出部材４に作用する捩りモーメントを分担できるよう、張出部材４を周回して定着材３が配置される。ベースプレート２の、張出部材４を周回する帯状部分の幅が、定着材３を挿通させるための挿通孔を形成可能な大きさを持つ。 In the drawing, since the overhanging member 4 is assembled from two vertical plates 41 and two horizontal plates 42 and formed in a uniform cross section over the entire length in the axial direction, the base plate 2 is the overhanging member 4. It has an area that can secure at least a distance (protruding width) that allows the fixing material 3 to be inserted from the outer peripheral surface to the edge (outer circumference) of the base plate 2. The overhanging member so that the twisting moment acting on the overhanging member 4 can be shared by the band-shaped portion of the base plate 2 that protrudes from the outer peripheral surface of the overhanging member 4 and goes around the overhanging member 4. The fixing material 3 is arranged around 4. The width of the band-shaped portion of the base plate 2 that orbits the overhanging member 4 has a size capable of forming an insertion hole for inserting the fixing material 3.

張出部材４に作用する捩りモーメントは張出部材４の外周に位置する複数本の定着材３を張出部材４の軸の回りに回転させようとするから、定着材３は捩りモーメントに対しては軸に直交する方向のせん断力を負担することにより抵抗する。 Since the torsional moment acting on the overhanging member 4 tries to rotate a plurality of fixing members 3 located on the outer periphery of the overhanging member 4 around the axis of the overhanging member 4, the fixing member 3 has a torsional moment. It resists by bearing a shear force in the direction orthogonal to the axis.

ベースプレート２の、定着材３の配置位置以外の部分には、張出部材４が上部構造の鉛直荷重を受けることにより張出部材４とベースプレート２に作用する曲げモーメントによる曲げ変形に対する補剛のために、必要によりリブプレート２１が突設される。 In the portion of the base plate 2 other than the arrangement position of the fixing material 3, the overhanging member 4 is stiffened against bending deformation due to the bending moment acting on the overhanging member 4 and the base plate 2 when the overhanging member 4 receives the vertical load of the superstructure. The rib plate 21 is projected as needed.

張出部材４の上には上部構造１０の軸方向の端部が直接、もしくは間接的に載り、張出部材４に支持されるため、図面では上部構造１０を直接、もしくは間接的に受けるための支持部材６を張出部材４の上面に載置し、溶接等により固定している。上記のように図面では水管１０１を保持する保持材８の脚部８１を受ける必要から、支持部材６に、上部構造１０の幅方向に２本の脚部８１、８１を支持可能な幅を持たせている。張出部材４が図示するように箱形断面の場合、支持部材６は上部の水平プレート４２の上面に重なって接合されるため、支持部材６の安定性を確保し易い。「上部構造１０の幅方向」は主に橋軸直角方向であるが、橋軸に垂直な方向でないこともある。 Since the axial end of the superstructure 10 is directly or indirectly placed on the overhanging member 4 and supported by the overhanging member 4, the superstructure 10 is directly or indirectly received in the drawing. The support member 6 of the above is placed on the upper surface of the overhanging member 4 and fixed by welding or the like. As described above, in the drawing, since it is necessary to receive the legs 81 of the holding material 8 that holds the water pipe 101, the support member 6 has a width capable of supporting the two legs 81, 81 in the width direction of the superstructure 10. I'm letting you. When the overhanging member 4 has a box-shaped cross section as shown in the drawing, the supporting member 6 is joined so as to overlap the upper surface of the upper horizontal plate 42, so that the stability of the supporting member 6 can be easily ensured. The "width direction of the superstructure 10" is mainly in the direction perpendicular to the bridge axis, but may not be in the direction perpendicular to the bridge axis.

支持部材６の形態も任意であるが、図面では図１、図２に示すように張出部材４の上側の水平プレート４２上に水平２方向を向いて配置され、水平プレート４２に接合等により一体化する鉛直プレート６１とその上に固定され、後述の受け部材７を支持する水平プレート６２から支持部材６を組み立てている。図面ではまた、張出部材４を構成する一部の鉛直プレート４１を支持部材６側へ延長（連続）させ、その鉛直プレート４１を支持部材６の鉛直プレート６１として兼用している。 The form of the support member 6 is also arbitrary, but as shown in FIGS. 1 and 2, the support member 6 is arranged on the horizontal plate 42 on the upper side of the overhanging member 4 so as to face two horizontal directions, and is joined to the horizontal plate 42 by joining or the like. The support member 6 is assembled from a vertical plate 61 to be integrated and a horizontal plate 62 fixed on the vertical plate 61 to support the receiving member 7 described later. In the drawing, a part of the vertical plates 41 constituting the overhanging member 4 are extended (continuously) toward the support member 6, and the vertical plate 41 is also used as the vertical plate 61 of the support member 6.

支持部材６の上には保持材８の脚部８１を直接、受ける受け部材７、７が上部構造１０の幅方向に並列して配置され、固定される。図面では図１、図２に示すように水平プレート６２の上に受け部材７を配置し、受け部材７の内、後述の固定材７２を水平プレート６２にボルトにより接合している。 On the support member 6, the receiving members 7 and 7 that directly receive the legs 81 of the holding member 8 are arranged and fixed in parallel in the width direction of the superstructure 10. In the drawings, as shown in FIGS. 1 and 2, the receiving member 7 is arranged on the horizontal plate 62, and among the receiving members 7, the fixing member 72 described later is joined to the horizontal plate 62 by a bolt.

受け部材７は保持材８が上部構造１０としての水管１０１を保持している状態で、水管１０１に生じる熱による軸方向の伸縮に追従可能な構造をしている。具体的には受け部材７は図５、図６に示すように例えば保持材８の脚部８１に接続、または接合（固定）される接続材７１と、支持部材６に固定されながら、接続材７１を水管１０１の軸方向に相対移動自在に支持する固定材７２から構成される。 The receiving member 7 has a structure capable of following axial expansion and contraction due to heat generated in the water pipe 101 while the holding member 8 holds the water pipe 101 as the superstructure 10. Specifically, as shown in FIGS. 5 and 6, the receiving member 7 is connected to, for example, the leg portion 81 of the holding member 8 or joined (fixed) to the connecting member 71, and the connecting member 7 is fixed to the support member 6 while being fixed to the connecting member. It is composed of a fixing member 72 that supports 71 so as to be relatively movable in the axial direction of the water pipe 101.

この場合、接続材７１の底面（下面）が固定材７２の上面に摩擦係数の小さい四フッ化エチレン樹脂、ＭＣナイロン等の低摩擦材７３を介して接触することにより、互いの接触面には水管１０１の鉛直荷重が圧力として作用しながらも、接続材７１が固定材７２に対して相対移動可能になっている。低摩擦材７３は図５−（ａ）に示すように接続材７１の底面と固定材７２の上面の少なくともいずれか一方に貼着、埋設等により露出した状態で固定される。 In this case, the bottom surface (lower surface) of the connecting material 71 comes into contact with the upper surface of the fixing material 72 via a low friction material 73 such as a tetrafluorinated ethylene resin or MC nylon having a small friction coefficient, so that the contact surfaces thereof come into contact with each other. While the vertical load of the water pipe 101 acts as pressure, the connecting material 71 can move relative to the fixing material 72. As shown in FIG. 5- (a), the low friction material 73 is fixed to at least one of the bottom surface of the connecting material 71 and the upper surface of the fixing material 72 in an exposed state by sticking, burying, or the like.

接続材７１の底面には図１、図２に示すように接続材７１の、固定材７２に対する相対移動時に固定材７２に沿って移動するためのガイドとなる案内部７１ａが一体化し、固定材７２側へ張り出しており、図６に示すように案内部７１ａが固定材７２に厚さ方向に貫通して形成された長孔状の案内溝７２ａを挿通する。案内溝７２ａは固定材７２を厚さ方向に貫通するため、底面側は開放し、案内溝７２ａは支持部材６の上面には接触しない。 As shown in FIGS. 1 and 2, the bottom surface of the connecting material 71 is integrated with a guide portion 71a that serves as a guide for moving the connecting material 71 along the fixing material 72 when the connecting material 71 moves relative to the fixing material 72. As shown in FIG. 6, the guide portion 71a projects toward the 72 side and inserts an elongated hole-shaped guide groove 72a formed so as to penetrate the fixing member 72 in the thickness direction. Since the guide groove 72a penetrates the fixing material 72 in the thickness direction, the bottom surface side is open and the guide groove 72a does not come into contact with the upper surface of the support member 6.

案内部７１ａが案内溝７２ａを挿通し、接続材７１の底面が固定材７２の上面に接触したとき、案内部７１ａの底面は支持部材６の上面には接触せずに浮いた状態になる。案内部７１ａの下部には接続材７１が固定材７２から浮き上がろうとするときに案内溝７２ａから抜け出さないよう、案内溝７２ａの周囲に底面側から係止し得る係止部７１ｂが形成される。 When the guide portion 71a inserts the guide groove 72a and the bottom surface of the connecting member 71 comes into contact with the upper surface of the fixing member 72, the bottom surface of the guide portion 71a floats without contacting the upper surface of the support member 6. At the lower part of the guide portion 71a, a locking portion 71b that can be locked from the bottom surface side is formed around the guide groove 72a so that the connecting material 71 does not come out of the guide groove 72a when it tries to rise from the fixing member 72. To.

１……支持装置、
２……ベースプレート、２１……リブプレート、３……定着材、
４……張出部材、４１……鉛直プレート、４２……水平プレート、
５……閉塞板、
６……支持部材、６１……鉛直プレート、６２……水平プレート、
７……受け部材、７１……接続材、７１ａ……案内部、７１ｂ……係止部、７２……固定材、７２ａ……案内溝、７３……低摩擦材、
８……保持材、８１……脚部、
９……下部構造、９１……側面、９２……削孔、
１０……上部構造、１０１……水管。 1 …… Support device,
2 ... base plate, 21 ... rib plate, 3 ... fixing material,
4 …… Overhanging member, 41 …… Vertical plate, 42 …… Horizontal plate,
5 …… Blocking plate,
6 …… Support member, 61 …… Vertical plate, 62 …… Horizontal plate,
7 ... Receiving member, 71 ... Connecting material, 71a ... Guide part, 71b ... Locking part, 72 ... Fixing material, 72a ... Guide groove, 73 ... Low friction material,
8 …… Holding material, 81 …… Legs,
9 ... Substructure, 91 ... Side, 92 ... Drilling,
10 ... superstructure, 101 ... water pipe.

Claims (3)

橋梁の下部構造の、対向する下部構造側を向いた側面から橋軸方向へ張り出し、上部構造の橋軸方向の端部を支持する支持装置であり、
前記下部構造の前記側面に重なって接合されるベースプレートと、このベースプレートの表面に突設され、前記対向する下部構造側へ張り出し、前記上部構造を直接、もしくは間接的に支持する張出部材とを備え、
前記張出部材は軸方向の全長に亘り、閉鎖断面をなし、
前記張出部材の、前記対向する下部構造側の端面、もしくは端部に閉塞板が接合され、この下部構造側の端面、もしくは端部が閉塞されていることを特徴とする橋梁上部構造の支持装置。 It is a support device that projects from the side surface of the substructure of the bridge facing the opposite substructure side in the direction of the bridge axis and supports the end portion of the superstructure in the direction of the bridge axis.
A base plate that is overlapped and joined to the side surface of the substructure, and an overhanging member that projects from the surface of the base plate and projects to the opposite substructure side to directly or indirectly support the superstructure. Prepare,
The overhanging member has a closed cross section over the entire length in the axial direction .
A support for a bridge superstructure, characterized in that a closing plate is joined to an end surface or an end portion of the overhanging member on the opposite substructure side, and the end surface or the end portion on the substructure side is closed. apparatus. 前記ベースプレートの面積は前記張出部材の軸に直交する方向の断面積より大きく、前記ベースプレートを前記下部構造の前記側面に固定する定着材は前記張出部材の外周側に配置されていることを特徴とする請求項１に記載の橋梁上部構造の支持装置。 The area of the base plate is larger than the cross-sectional area in the direction orthogonal to the axis of the overhanging member, and the fixing material for fixing the base plate to the side surface of the substructure is arranged on the outer peripheral side of the overhanging member. The support device for the bridge superstructure according to claim 1. 前記張出部材の上部に前記上部構造を受ける支持部材が固定されていることを特徴とする請求項１、もしくは請求項２に記載の橋梁上部構造の支持装置。 The support device for a bridge superstructure according to claim 1 or 2 , wherein the support member for receiving the superstructure is fixed to the upper part of the overhanging member.
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