JP6275771B2 - Sealing material between bridge girder and floor slab - Google Patents

Sealing material between bridge girder and floor slab Download PDF

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JP6275771B2
JP6275771B2 JP2016113417A JP2016113417A JP6275771B2 JP 6275771 B2 JP6275771 B2 JP 6275771B2 JP 2016113417 A JP2016113417 A JP 2016113417A JP 2016113417 A JP2016113417 A JP 2016113417A JP 6275771 B2 JP6275771 B2 JP 6275771B2
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foam
bridge girder
floor slab
sealing material
length direction
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鈴木　英郎
英郎 鈴木
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Inoac Corp
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本発明は、橋梁や高架橋における橋桁と床版との間に橋桁の長さ方向に沿って配設されるシール材に関する。   The present invention relates to a seal member disposed along a length direction of a bridge girder between a bridge girder and a floor slab in a bridge or a viaduct.

従来、図４に示すように、Ｈ型鋼からなる橋桁５１を幅員方向Ｗに所要間隔あけて、かつ橋軸方向Ｌに沿って橋脚５３上方に配置し、前記橋桁５１の上面には幅員方向Ｗへ互いに所要間隔離したシール材５５，５５を橋桁５１の長さ方向（橋軸方向Ｌと同じ）に沿って並設し、その後に前記シール材５５上にプレストレストコンクリート床版（以下床版とも記す。）５７を配置し、さらに前記橋桁５１上面のシール材５５，５５間にコンクリートやモルタル５９を打設することにより、前記床版５７を橋桁５１上に固定する方法が多用されている。   Conventionally, as shown in FIG. 4, bridge girders 51 made of H-shaped steel are arranged at a necessary interval in the width direction W and above the bridge piers 53 along the bridge axis direction L, and the upper surface of the bridge girder 51 has a width direction W Seal members 55, 55 separated from each other as necessary are juxtaposed along the length direction of the bridge girder 51 (same as the bridge axis direction L), and then a prestressed concrete slab (hereinafter also referred to as a floor slab) is placed on the seal member 55. A method of fixing the floor slab 57 on the bridge girder 51 by placing 57 and placing concrete or mortar 59 between the sealing materials 55 and 55 on the upper surface of the bridge girder 51 is frequently used.

前記シール材５５は、床版５７と橋桁５１間における型枠として、及び床版５７の支持部材として作用し、橋桁５１と床版５７間でコンクリートやモルタルが硬化するまでの間コンクリートやモルタルが吐露しない（垂れない）ようにシールする機能が求められる。前記シール材５５として、従来では独立気泡型のポリエチレン発泡体やゴムスポンジ等からなる独立気泡型の発泡体を、断面四角形からなる長尺に形成したものが用いられている。
また、シール材を発泡体の二層構造とし、一側の発泡体を独立気泡型の発泡体、他側の発泡体を一側の発泡体よりも連続気泡が多く含まれる発泡体としたものが提案されている。 The sealing material 55 acts as a frame between the floor slab 57 and the bridge slab 51 and as a support member for the floor slab 57, and the concrete or mortar remains until the concrete or mortar is cured between the bridge girder 51 and the floor slab 57. The function of sealing so that it does not dew (does not drip) is required. As the sealing material 55, conventionally, a closed-cell foam made of closed-cell polyethylene foam, rubber sponge, or the like formed into a long shape having a square cross section is used.
Also, the sealing material has a two-layer structure of foam, the foam on one side is a closed-cell foam, and the foam on the other side is a foam containing more open cells than the foam on the one side. Has been proposed.

しかしながら、床版を支持するためには橋桁と床版間にコンクリートやモルタルを床版の荷重に耐えうる幅（面積）に打設する必要があるため、橋桁と床版間のシール材は横幅を狭く、すなわち横幅に比べて高さのある縦長形状とされることが求められる。そのような形状にした場合、床版をクレーンで吊り上げて橋桁上のシール材に載せる際に行われる床版の位置微調整時に、床版の下面で擦られる等によって横方向の力が加わると、横に倒れたり横へずれたりすることがある。その場合、床版をシール材の上方へ離してシール材を正しい位置に直した後、再度床版の位置調整をしなければならず、施工作業に手間取る問題がある。   However, in order to support the floor slab, it is necessary to place concrete or mortar between the bridge girder and the floor slab in a width (area) that can withstand the load of the floor slab. Is required to be narrow, that is, a vertically long shape having a height compared to the width. In such a shape, when a horizontal force is applied by rubbing on the lower surface of the floor slab when finely adjusting the position of the floor slab, which is performed when the floor slab is lifted with a crane and placed on the sealant on the bridge girder , May fall sideways or slip sideways. In that case, after the floor slab is separated above the sealing material and the sealing material is corrected to the correct position, the position of the floor slab must be adjusted again.

特開２００３−１５５７０８号公報JP 2003-155708 A 特開２００３−１５５７０９号公報JP 2003-155709 A

本発明は前記の点に鑑みなされたものであって、床版をシール材上に載置する際に行われる床版の位置調整時に、横方向へ倒れたり位置ズレを生じたりし難いシール材の提供を目的とする。   The present invention has been made in view of the above points, and is difficult to cause lateral displacement or misalignment when the position of the floor slab is adjusted when the floor slab is placed on the sealing material. The purpose is to provide.

請求項１の発明は、橋桁と該橋桁上方に配置される床版との間に橋桁の長さ方向に沿って配設されるシール材であって、上側発泡体と下側発泡体が積層一体化された二層からなり、前記上側発泡体は、前記下側発泡体との接触面における前記橋桁の長さ方向と直交する横幅（Ｗｓ）が、前記下側発泡体の前記橋桁の上面に配置される面における前記橋桁の長さ方向と直交する横幅（ｗ２）より小であり、前記下側発泡体は、前記橋桁の長さ方向に対して垂直方向の断面が、四角形であることを特徴とする橋桁と床版間のシール材に係る。 The invention according to claim 1 is a sealing material disposed along the length direction of the bridge girder between the bridge girder and the floor slab disposed above the bridge girder, wherein the upper foam and the lower foam are laminated. The upper foam has a width (Ws) perpendicular to the length direction of the bridge girder at the contact surface with the lower foam, and the upper foam has an upper surface of the bridge girder of the lower foam. The width of the lower foam is smaller than the width (w2) orthogonal to the length direction of the bridge girder, and the lower foam has a quadrilateral cross section perpendicular to the length direction of the bridge girder. It relates to the seal material between the bridge girder and floor slab characterized by.

請求項２の発明は、請求項１において、前記上側発泡体は、外側に露出する表面にスキン層を有することを特徴とする。   According to a second aspect of the present invention, in the first aspect, the upper foam has a skin layer on a surface exposed to the outside.

本発明のシール材は、上側発泡体は、下側発泡体との接触面における橋桁の長さ方向と直交する横幅が、下側発泡体の橋桁の上面に配置される面における橋桁の長さ方向と直交する横幅より小であるため、上側発泡体の下側発泡体との接合幅が小さくなり、横方向の力が加わって回転変形する際に下側発泡体の上面で横方向へ変形しやすくなる。したがって、本発明のシール材は、床版の位置調等の際に横方向の力が加わると、上側発泡体の変形によって力を吸収し、下側発泡体については変形を抑えることができるため、シール材全体が倒れたり位置がずれたりするのを防ぐことができ、シール材の貼り直し作業等の面倒な作業が不要になり、施工作業の簡略化を実現できる。   In the sealing material of the present invention, the upper foam has a bridge girder length on a surface where the lateral width perpendicular to the length direction of the bridge girder on the contact surface with the lower foam is arranged on the upper surface of the lower girder bridge girder. Since the width is smaller than the transverse width orthogonal to the direction, the joint width with the lower foam of the upper foam is reduced, and when the lateral force is applied, it is deformed in the lateral direction on the upper surface of the lower foam when rotating. It becomes easy to do. Therefore, the sealing material of the present invention can absorb the force by deformation of the upper foam and suppress the deformation of the lower foam when a lateral force is applied during the position adjustment of the floor slab. Therefore, it is possible to prevent the entire sealing material from falling down or shifting its position, eliminating the need for troublesome work such as reattaching the sealing material, and simplifying the construction work.

また、本発明のシール材は、上側発泡体が外側に露出する表面にスキン層を有するものであるため、床版の位置調整等の際、床版の下面で上側発泡体が擦られたりしても、表面が傷付き難く、シール性が損なわれ難い効果がある。   Further, since the sealing material of the present invention has a skin layer on the surface where the upper foam is exposed to the outside, the upper foam may be rubbed on the lower surface of the floor slab when the position of the floor slab is adjusted. However, there is an effect that the surface is hardly damaged and the sealing property is not easily impaired.

本発明の実施形態に係るシール材の斜視図である。It is a perspective view of the sealing material which concerns on embodiment of this invention. 図１のシール材における上側発泡体の上面付近を示す拡大断面図である。It is an expanded sectional view which shows the upper surface vicinity of the upper side foam in the sealing material of FIG. 図１のシール材の作用を示す断面図である。It is sectional drawing which shows the effect | action of the sealing material of FIG. 橋桁、シール材及び床版等を示す概略斜視図である。It is a schematic perspective view which shows a bridge girder, a sealing material, a floor slab, etc.

以下、本発明の実施形態について説明する。図１に示すシール材１０は、図４に示した橋桁５１と該橋桁５１の上方に配置されるプレストレストコンクリート床版５７との間に橋桁５１の長さ方向に沿って配設されるもので、施工条件等に応じて所要寸法とされている。なお、使用に際しては、橋桁の長さに応じて橋桁の長さ方向に所要本数連接して用いられる。   Hereinafter, embodiments of the present invention will be described. The sealing material 10 shown in FIG. 1 is arranged along the length direction of the bridge girder 51 between the bridge girder 51 shown in FIG. 4 and the prestressed concrete floor slab 57 arranged above the bridge girder 51. The required dimensions are set according to the construction conditions. In use, the required number is connected in the length direction of the bridge girder according to the length of the bridge girder.

前記シール材１０は、上側発泡体１１と下側発泡体２１が接着剤や両面粘着テープ等で積層一体化された長尺品からなる。
前記上側発泡体１１は、前記橋桁の長さ方向に対して垂直方向の断面が、角１５が丸い四角形又は円形の断面形状を有する棒状体からなる。前記上側発泡体１１の材質としてはポリウレタンフォームなどの弾性を有する発泡体が好適である。前記上側発泡体１１は、図２の拡大断面図に示すように外側表面にスキン層１２を有するものが好ましい。前記スキン層１２は、気泡の圧縮により、あるいは気泡サイズが小さくなることによって緻密な膜状となったもので、平滑性が高く、また破れにくいため、前記床版５７側として使用すれば、作業時に前記上側発泡体１１の上面を擦ることがある床版５７の位置調整が容易になるのみならず、床版５７に擦られても破損し難くなる。さらに、透水性も低いため、前記コンクリートやモルタルの水分漏出防止に対するシール性も向上する。 The sealing material 10 is a long product in which the upper foam 11 and the lower foam 21 are laminated and integrated with an adhesive, a double-sided adhesive tape, or the like.
The upper foamed body 11 is a rod-shaped body having a quadrangular shape or a circular cross-sectional shape with a rounded corner 15 in a cross section perpendicular to the longitudinal direction of the bridge beam. As the material of the upper foam 11, a foam having elasticity such as polyurethane foam is suitable. The upper foam 11 preferably has a skin layer 12 on the outer surface as shown in the enlarged sectional view of FIG. The skin layer 12 is a dense film formed by compressing bubbles or by reducing the bubble size, and has high smoothness and is not easily torn. The position adjustment of the floor slab 57 that sometimes rubs the upper surface of the upper foam 11 is facilitated, and even if the floor slab 57 is rubbed, it is difficult to break. Furthermore, since the water permeability is low, the sealing performance for preventing moisture leakage of the concrete and mortar is also improved.

なお、表面にスキン層を有する発泡体の製造方法としては、特許第３９８７２５２号に記載されている方法、すなわち厚紙ロールから連続的に繰り出されて走行する成形紙（離型紙）の上部平滑面にウレタン原料を連続的に供給し、該成形紙の両端を合わせて角筒状にして発泡させる方法、あるいはウレタン原料を成形型内で発泡させるモールド成形法等がある。前者の方法によって発泡成形されたものは、パーティングライン（ＰＬ）が一つのみの長尺品とすることができて好ましい。ＰＬ上ではスキン層が切れてしまうか、周囲よりも凸状となってシール性が低下するため、この方法で成形された上部発泡体のＰＬを、下側発泡体に当接させて、上側発泡体と下側発泡体間に挟むように接合することが好ましい。このように成形すれば、床版と接する可能性のある上側発泡体の露出する表面全面にスキン層を有するシール材とすることができる。
また、前記上側発泡体１１の断面を角１５が丸い四角形とすれば、前記下側発泡体上に接合する際に、接合面が平滑となるので安定して接合しやすい。上記のように、ＰＬが一つのみの長尺品でできた前記上側発泡体のＰＬを有する面と、下側発泡体の上面を両面粘着テープや接着剤等で接合することで、容易にＰＬをシール材１０の内部に挟みこんで、上側発泡体１１と下側発泡体２１を一体化することができる。 In addition, as a manufacturing method of the foam having a skin layer on the surface, the method described in Japanese Patent No. 3987252, that is, on the upper smooth surface of the formed paper (release paper) that is continuously fed from the cardboard roll and travels. There are a method in which a urethane raw material is continuously supplied and both ends of the molding paper are put into a square tube shape and foamed, or a molding method in which a urethane raw material is foamed in a molding die. The foam molded by the former method is preferable because it can be a long product having only one parting line (PL). On the PL, the skin layer may be cut or protruded more than the surroundings to lower the sealing performance. Therefore, the upper foam PL molded by this method is brought into contact with the lower foam, It is preferable to join so as to be sandwiched between the foam and the lower foam. By molding in this way, a sealing material having a skin layer on the entire exposed surface of the upper foam that may be in contact with the floor slab can be obtained.
Further, if the cross-section of the upper foam 11 is a quadrangle with rounded corners 15, the joining surface becomes smooth when joining on the lower foam, so that stable joining is easy. As mentioned above, the surface of the upper foam made of a long product with only one PL is joined to the upper surface of the lower foam with a double-sided adhesive tape, adhesive, etc. The upper foam 11 and the lower foam 21 can be integrated by sandwiching PL inside the sealing material 10.

前記上側発泡体１１は、密度（ＪＩＳ Ｋ７２２２：２００５）が９０〜１７０ｋｇ／ｍ３、２５％圧縮硬さ（ＪＩＳ Ｋ６４００−２：２００４ Ｄ法）が５〜２５ｋＰａであるものが好ましい。密度が前記範囲より低い場合には止水性が不十分となり、一方高い場合には硬くなってハンドリング性が悪くなる。また、２５％圧縮硬さが前記範囲より低い場合にも止水性が不十分となり、一方高い場合には圧縮残留歪が大きくなる。 The upper foam 11 preferably has a density (JIS K7222: 2005) of 90 to 170 kg / m 3 and a 25% compression hardness (JIS K6400-2: 2004 D method) of 5 to 25 kPa. When the density is lower than the above range, the water-stopping property is insufficient. On the other hand, when the density is high, it becomes hard and the handling property is deteriorated. Further, when the 25% compression hardness is lower than the above range, the water stoppage is insufficient, while when it is high, the compressive residual strain increases.

また、前記上側発泡体１１の横幅ｗ１は１０〜１００ｍｍ、高さｈ１は１０〜１００ｍｍが好ましい。さらに、横幅ｗ１：高さｈ１の比は１：０．５〜２が好ましい。高さｈ１が前記比の範囲よりも小さくなる場合はＰＣ床版や鋼板の寸法バラツキを吸収しづらくなり、一方大きくなる場合は床版設置時にシール材が大きく倒れて設置予定位置からずれてしまう虞がある。   The lateral foam w1 of the upper foam 11 is preferably 10 to 100 mm, and the height h1 is preferably 10 to 100 mm. Furthermore, the ratio of the width w1: height h1 is preferably 1: 0.5-2. When the height h1 is smaller than the above range, it becomes difficult to absorb the dimensional variation of the PC floor slab and the steel plate. On the other hand, when the height h1 is larger, the seal material falls down greatly when the floor slab is installed and deviates from the planned installation position. There is a fear.

前記下側発泡体２１は、前記橋桁の長さ方向に対して垂直方向の断面が、角の有る（すなわち四隅が丸くなっていない）四角形（正方形あるいは長方形）の断面形状を有する棒状体からなる。前記下側発泡体２１の材質としては、ポリウレタンフォーム、ゴムスポンジ、ポリオレフィンフォーム等を挙げることができる。特にポリエチレンフォーム等のポリオレフィンフォームが好ましい。
また、前記下側発泡体２１は、密度（ＪＩＳ Ｋ７２２２：２００５）が２０〜２００ｋｇ／ｍ３、２５％圧縮硬さ（ＪＩＳ Ｋ６４００−２：２００４ Ｄ法）が３０〜３５０ｋＰａであるものが好ましい。密度が前記範囲より低い場合には止水性が不十分となり、一方高い場合には硬くなってハンドリング性が悪くなる。また、２５％圧縮硬さが前記範囲より低い場合にも止水性が不十分であると同時に横方向への変形も大きくなり、一方高い場合にはハンドリング性が悪くなる。 The lower foam body 21 is made of a rod-like body having a square (square or rectangular) cross section in which the cross section in the direction perpendicular to the length direction of the bridge girder has corners (that is, the four corners are not rounded). . Examples of the material of the lower foam 21 include polyurethane foam, rubber sponge, polyolefin foam, and the like. Particularly preferred are polyolefin foams such as polyethylene foam.
The lower foam 21 preferably has a density (JIS K7222: 2005) of 20 to 200 kg / m 3 and a 25% compression hardness (JIS K6400-2: 2004 D method) of 30 to 350 kPa. When the density is lower than the above range, the water-stopping property is insufficient. On the other hand, when the density is high, it becomes hard and the handling property is deteriorated. Further, even when the 25% compression hardness is lower than the above range, the water stoppage is insufficient, and at the same time, the deformation in the lateral direction is increased.

前記下側発泡体２１の２５％圧縮硬さは、前記上側発泡体１１の２５％圧縮硬さよりも大きい。すなわち前記上側発泡体１１の２５％圧縮硬さは、前記下側発泡体２１の２５％圧縮硬さよりも小さい。さらに、前記上側発泡体１１と前記下側発泡体２１の２５％圧縮硬さ比は１：１．５〜１：７０の範囲が好ましい。前記下側発泡体２１の２５％圧縮硬さが、前記２５％圧縮硬さ比の範囲よりも小さい場合には、前記下側発泡体２１が上側発泡体１１に対して好ましい相対的な硬度よりも低い硬度になる。そのため、前記シール材１０上に床版を載置する際に行われる床版の位置調整時などにおいて、床版がシール材１０に接触する等によって前記シール材１０に横方向の力が加わると、前記下側発泡体２１側で変形し易くなってシール材１０の全体が底部から倒れやすくなる。一方、前記下側発泡体２１の２５％圧縮硬さが前記２５％圧縮硬さ比の範囲よりも大きい場合には、前記下側発泡体２１が上側発泡体１１に対して好ましい相対的な硬度よりも高くなるため、床版の載置時に前記下側発泡体２１の変形密着性が損なわれてシール性が低下するようになる。   The 25% compression hardness of the lower foam 21 is greater than the 25% compression hardness of the upper foam 11. That is, the 25% compression hardness of the upper foam 11 is smaller than the 25% compression hardness of the lower foam 21. Furthermore, the 25% compression hardness ratio between the upper foam 11 and the lower foam 21 is preferably in the range of 1: 1.5 to 1:70. When the 25% compression hardness of the lower foam 21 is smaller than the range of the 25% compression hardness ratio, the lower foam 21 is more preferable than the relative hardness preferred for the upper foam 11. Becomes a low hardness. For this reason, when a floor slab is adjusted when the floor slab is placed on the seal material 10, when a lateral force is applied to the seal material 10 due to the floor slab coming into contact with the seal material 10 or the like. It becomes easy to deform | transform on the said lower side foam 21 side, and the whole sealing material 10 becomes easy to fall down from a bottom part. On the other hand, when the 25% compression hardness of the lower foam 21 is larger than the range of the 25% compression hardness ratio, the lower foam 21 is preferable relative to the upper foam 11. Therefore, when the floor slab is placed, the deformation adhesiveness of the lower foam 21 is impaired, and the sealing performance is lowered.

前記下側発泡体２１の横幅ｗ２は１０〜１００ｍｍ、高さｈ２は１０〜１００ｍｍが好ましい。さらに、横幅ｗ２：高さｈ２の比は１：０．５〜２が好ましい。高さｈ２が前記比の範囲よりも小さくなる場合にはシール材１０は安定するものの、シール材１０間に充填されるコンクリートやモルタル量が不足して床版の支持力が不足する虞がある。一方大きくなる場合には前記下側発泡体２１の高さが高すぎて、床版設置時にシール材１０の全体が底部から倒れる虞がある。   The lower foam 21 preferably has a lateral width w2 of 10 to 100 mm and a height h2 of 10 to 100 mm. Furthermore, the ratio of the width w2: height h2 is preferably 1: 0.5-2. When the height h2 is smaller than the above range, the sealing material 10 is stable, but the amount of concrete and mortar filled between the sealing materials 10 is insufficient, and the support capacity of the floor slab may be insufficient. . On the other hand, when it becomes larger, the height of the lower foam 21 is too high, and there is a possibility that the whole sealing material 10 may fall from the bottom when the floor slab is installed.

さらに、前記上側発泡体１１の高さｈ１：下側発泡体の高さｈ２の比は１：０．５〜２が好ましい。前記下側発泡体２１の高さｈ２が前記高さの比の範囲よりも小さくなる場合には、前記上部発泡体１１の高さが高すぎて、床版設置時にシール材が大きく倒れて設置予定位置からずれてしまう虞がある。一方大きくなる場合にはＰＣ床版や鋼板の寸法のバラツキに対応させるだけの圧縮しろが不足してシール性が低下する虞がある。   Furthermore, the ratio of the height h1 of the upper foam 11 to the height h2 of the lower foam is preferably 1: 0.5-2. When the height h2 of the lower foam 21 is smaller than the range of the height ratio, the height of the upper foam 11 is too high, and the sealing material is greatly collapsed when the floor slab is installed. There is a risk of deviation from the planned position. On the other hand, when it becomes large, there is a possibility that the sealability is deteriorated due to insufficient compression margin to cope with variations in dimensions of the PC floor slab and the steel plate.

また、前記シール材１０の高さ（ｈ１＋ｈ２）は、床版と橋桁間の間隔に応じて設定されるが、通常４０ｍｍ〜１５０ｍｍとされる。前記シール材１０の高さ（ｈ１＋ｈ２）は、前記上側発泡体１１の横幅ｗ１と前記下側発泡体２１の横幅ｗ２のうち大きい方の寸法（シール材１０の最大横幅Ｗｕ）以上であって、（ｈ１＋ｈ２）：Ｗｕ＝１：０．２〜１であることが好ましい。シール材の最大横幅Ｗｕが前記範囲より小さければ、床版設置時にシール材１０の全体が底部から倒れてしまう虞がある。シール材１０の最大横幅Ｗｕが前記範囲より大きければ、シール材１０間に充填されるコンクリートやモルタル量が減少し、床版の支持力が低下する虞がある。 Moreover, although the height (h1 + h2) of the said sealing material 10 is set according to the space | interval between a floor slab and a bridge girder, it is usually set to 40 mm-150 mm. The height (h1 + h2) of the sealing material 10 is equal to or larger than the larger dimension (the maximum lateral width Wu of the sealing material 10) of the lateral width w1 of the upper foam 11 and the lateral width w2 of the lower foam 21; It is preferable that (h1 + h2): Wu = 1: 0.2-1. If the maximum width Wu of the sealing material is smaller than the above range, the entire sealing material 10 may fall from the bottom when the floor slab is installed. If the maximum width Wu of the sealing material 10 is larger than the above range, the amount of concrete and mortar filled between the sealing materials 10 may be reduced, and the support capacity of the floor slab may be reduced.

前記シール材１０は、床版の施工（橋桁の修繕工事を含む）時、図３の（３−Ａ）及び（３−Ｂ）に示すように、前記下側発泡体２１の下面（底面）に設けた両面粘着テープや接着剤等からなる接着部材３１により、橋桁５１の上面の幅方向両縁に固定される。そして図４に示したような床版５７をクレーンで吊り上げて橋桁５１上で位置の調整をしながらシール材１０に載せる。その際、前記シール材１０の上面、すなわち前記上側発泡体１１の上面が床版の下面で擦られる等によって前記シール材１０に横方向の力Ｆが加わった場合、前記上側発泡体１１の硬度と前記下側発泡体２１の硬度とが前記関係にあるため、相対的に硬度の低い前記上側発泡体１１が主に変形し、相対的に硬度の高い前記下側発泡体２１については変形を抑えることできる。また、前記上側発泡体１１の外面に形成されている前記スキン層１２によって上側発泡体１１の上面で滑りが良くなり、前記上側発泡体１１の上面と接触しながら行われることがある床版の位置調整が容易になるのみならず、前記上側発泡体１１の上面が床版で擦られても前記上側発泡体１１が破損し難くなる。   The sealing material 10 is a bottom surface (bottom surface) of the lower foam 21 as shown in (3-A) and (3-B) of FIG. 3 at the time of floor slab construction (including bridge girder repair work). It is fixed to both edges in the width direction of the upper surface of the bridge girder 51 by an adhesive member 31 made of a double-sided pressure-sensitive adhesive tape, an adhesive or the like. Then, the floor slab 57 as shown in FIG. At that time, when a lateral force F is applied to the sealing material 10 by rubbing the upper surface of the sealing material 10, that is, the upper surface of the upper foam 11 with the lower surface of the floor slab, the hardness of the upper foam 11 And the hardness of the lower foam 21 are in the above relationship, the upper foam 11 having a relatively low hardness is mainly deformed, and the lower foam 21 having a relatively high hardness is deformed. Can be suppressed. Further, the skin layer 12 formed on the outer surface of the upper foam 11 improves slippage on the upper surface of the upper foam 11 and may be performed while contacting the upper surface of the upper foam 11. Not only is the position adjustment easy, but even if the upper surface of the upper foam 11 is rubbed with a floor slab, the upper foam 11 is difficult to break.

さらに、前記上側発泡体１１は角１５が丸い四角形または円形の断面形状からなり、前記上側発泡体１１の下側発泡体２１との接触面における幅（Ｗｓ）が、前記上側発泡体１１の断面における横幅ｗ１よりも小さく設定されるため、横方向の力Ｆに対して底部の丸い角１５ａ、１５ｂが変形時に干渉することなく、前記下側発泡体２１の上面で横方向へ変形しやすい。加えて、前記下側発泡体２１は角の有る四角形の断面形状からなるため、横方向の力に対して底部の角２５ａ、２５ｂで踏ん張ることができ、転がり難くなっている。そのため、前記シール材１０は、横方向の力に対して主に前記上側発泡体１１の部分で横方向へ変形することになり、前記シール材１０の全体が底部から倒れたり位置がずれたりするのを防ぐことができる。従って、シール材の貼り直し作業等の面倒な作業が不要になり、施工作業の簡略化を実現できる。   Further, the upper foam 11 has a quadrangular or circular cross-sectional shape with rounded corners 15, and the width (Ws) at the contact surface with the lower foam 21 of the upper foam 11 is the cross section of the upper foam 11. Therefore, the round corners 15a and 15b at the bottom of the bottom foam 21 do not interfere with the lateral force F during deformation and are easily deformed in the lateral direction on the upper surface of the lower foam 21. In addition, since the lower foam body 21 has a square cross-sectional shape with corners, the lower foam body 21 can be stretched at the corners 25a and 25b at the bottom against a lateral force, and is difficult to roll. Therefore, the sealing material 10 is deformed in the lateral direction mainly in the portion of the upper foam 11 with respect to the lateral force, and the whole sealing material 10 falls from the bottom or shifts in position. Can be prevented. Therefore, troublesome work such as re-sticking work of the sealing material is not required, and the construction work can be simplified.

また、前記シール材１０は、前記上側発泡体１１及び下側発泡体２１の何れも発泡体からなるため、軽量であり、施工時の取り扱いが容易である。さらに、前記下側発泡体２１は、発泡体のシート材から断面四角形に切り出して作成することができ、カット寸法を変えるだけで自由に高さを変更することができるので、修繕工事などで当初の予定していた設定と異なる高さのシール材が必要となったり、工期の限られた急を要する場合にも速やかに成形して、対応することが可能である。
なお、前記床版を前記シール材１０上に載置した後に、前記シール材１０間にコンクリートやモルタルが充填され、橋桁と床版が一体化されて支持される。 Moreover, since both the said upper foam 11 and the lower foam 21 consist of a foam, the said sealing material 10 is lightweight, and the handling at the time of construction is easy. Further, the lower foam 21 can be prepared by cutting a foam sheet material into a square cross section, and the height can be freely changed by simply changing the cut dimensions. It is possible to quickly form and cope with a seal material having a height different from the planned setting, or when an emergency with a limited construction period is required.
In addition, after mounting the floor slab on the sealing material 10, concrete or mortar is filled between the sealing materials 10, and the bridge girder and the floor slab are integrated and supported.

１０ シール材
１１ 上側発泡体
１２ スキン層
１５ 丸い角
１５ａ、１５ｂ 底部の丸い角
２１ 下側発泡体 DESCRIPTION OF SYMBOLS 10 Sealing material 11 Upper foam 12 Skin layer 15 Round corner 15a, 15b Round corner 21 Bottom foam

Claims (2)

橋桁と該橋桁上方に配置される床版との間に橋桁の長さ方向に沿って配設されるシール材であって、
上側発泡体と下側発泡体が積層一体化された二層からなり、
前記上側発泡体は、前記下側発泡体との接触面における前記橋桁の長さ方向と直交する横幅が、前記下側発泡体の前記橋桁の上面に配置される面における前記橋桁の長さ方向と直交する横幅より小であり、
前記下側発泡体は、前記橋桁の長さ方向に対して垂直方向の断面が、四角形であることを特徴とする橋桁と床版間のシール材。 A sealing material disposed along the length direction of the bridge girder between the bridge girder and the floor slab disposed above the bridge girder,
It consists of two layers in which the upper foam and the lower foam are laminated and integrated,
The upper foam has a lateral width perpendicular to the length direction of the bridge girder in the contact surface with the lower foam, and the length direction of the bridge girder in the surface disposed on the upper surface of the bridge girder of the lower foam. Less than the width orthogonal to
A sealing material between a bridge girder and a floor slab, wherein the lower foam has a quadrangular cross section perpendicular to the length direction of the bridge girder. 前記上側発泡体は、外側に露出する表面にスキン層を有することを特徴とする請求項１に記載の橋桁と床版間のシール材。   The sealing material between a bridge girder and a floor slab according to claim 1, wherein the upper foam has a skin layer on a surface exposed to the outside.
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