JP2018141341A - Mounting structure of precast wall balustrade and mounting method thereof - Google Patents
Mounting structure of precast wall balustrade and mounting method thereof Download PDFInfo
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本開示は、橋梁の壁高欄としてプレキャストコンクリート部材を使用する場合における、プレキャスト壁高欄の取付構造及び取付方法に関する。 The present disclosure relates to a mounting structure and a mounting method for a precast wall rail when a precast concrete member is used as a wall rail for a bridge.
橋梁では通常、床版の幅方向（橋面に平行かつ橋軸に直交する方向）の両端部に壁高欄が設けられる。壁高欄は、一般的には床版架設後に場所打ち施工にて構築されることが多い。一方、工期の短縮等を目的として、壁高欄を予めプレキャストコンクリートで製作しておき、床版架設後に床版上にプレキャスト壁高欄を配置して床版との連結部にコンクリートを打設することで床版に接合する壁高欄の取付構造及び方法（例えば、特許文献１、２及び３）が知られている。また、床版から立設させた炭素繊維等の連続繊維補強材を、プレキャスト壁高欄に設けた貫通孔に挿入し、貫通孔に無収縮モルタルを充填する取付方法もある（例えば、特許文献４）。 In bridges, wall height columns are usually provided at both ends in the width direction of the slab (direction parallel to the bridge surface and perpendicular to the bridge axis). The wall rail is generally constructed by cast-in-place construction after slab construction. On the other hand, for the purpose of shortening the construction period, the wall rails are prefabricated with precast concrete, and after the floor slab is installed, the precast wall rails are placed on the floor slab and the concrete is placed at the connection with the floor slab. There are known wall railing attachment structures and methods (for example, Patent Documents 1, 2, and 3) for joining to floor slabs. There is also an attachment method in which a continuous fiber reinforcing material such as carbon fiber standing from a floor slab is inserted into a through-hole provided in a precast wall rail, and the through-hole is filled with non-shrink mortar (for example, Patent Document 4). ).
しかしながら、特許文献１〜３に記載の技術は、プレキャスト高欄部材を床版に連結するために、プレキャスト高欄部材のコンクリート部分から延出した鉄筋と、床版のコンクリート部分から延出した鉄筋とを、橋軸に直交する断面視で、ループを形成するように鉄筋を重ね合わせ、更に橋軸方向に沿って補強鉄筋を配筋する等の配筋作業や、足場及び型枠の設置を含むコンクリート打設のための作業等が施工現場で必要であり、施工現場での労力の削減及び工期の短縮が求められていた。特許文献４に記載の技術は、連続繊維補強材と無収縮モルタルとの付着が確認できないこと、鉄筋の代わりに比較的高価な炭素繊維等の連続繊維補強材が用いられること、また、床版に連続繊維補強材が立設しているため、床版をプレキャスト部材とした場合に保管及び運搬するのに嵩張ること等の問題があった。 However, in the techniques described in Patent Documents 1 to 3, in order to connect the precast railing member to the floor slab, the reinforcing bars extended from the concrete portion of the precast railing member and the reinforcing bars extended from the concrete portion of the floor slab are used. Concrete, including reinforcement work such as placing reinforcing bars in a cross-sectional view perpendicular to the bridge axis and forming reinforcing loops along the bridge axis direction, and installation of scaffolds and formwork Work for placement is required at the construction site, and reduction of labor and construction time at the construction site has been demanded. The technique described in Patent Document 4 is such that adhesion between the continuous fiber reinforcing material and the non-shrinkable mortar cannot be confirmed, a relatively expensive continuous fiber reinforcing material such as carbon fiber is used instead of the reinforcing bar, and a floor slab Further, since the continuous fiber reinforcing material is erected, there is a problem that it is bulky to store and transport when the floor slab is used as a precast member.
本発明はこのような背景に鑑み、施工現場での労力を削減し、かつ工期を短縮し、更に接合に関与する部材の連結を担保できるプレキャスト壁高欄の取付構造及び取付方法を提供することを目的とする。 In view of such a background, the present invention provides a mounting structure and mounting method for a precast wall rail that can reduce the labor on the construction site, shorten the construction period, and further secure the connection of members involved in joining. Objective.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付構造（１，３１）は、上下方向に延在して上方に開放された受容孔（９，３７）を有する、床版（３）又は前記床版に設けられた地覆（４）と、コンクリート部分及び該コンクリート部分の下端から下方に突出する端部を有する縦方向定着筋（７ａ、７ｂ、３６ｂ）を有し、前記床版又は前記地覆上に配置されたプレキャスト壁高欄部材（２，３２）とを備え、前記縦方向定着筋の前記端部の下端に機械式定着の定着具（１１）が設けられ、前記縦方向定着筋の該端部が前記受容孔内に充填された第１充填材（１０）内に埋設されていることを特徴とする。ここで、「機械式定着の定着具」とは、機械式定着において鉄筋に作用する引張力をコンクリートに伝達するために鉄筋端部に設けられる、鉄筋の延在方向に直交する断面において鉄筋本体よりも断面積の大きな、板又はこぶ状のものを意味する。 A precast wall rail mounting structure (1, 31) according to at least some embodiments of the present invention includes a floor slab (3, 37) having a receiving hole (9, 37) extending in the vertical direction and opened upward. ) Or a ground cover (4) provided on the floor slab, and a vertical fixing bar (7a, 7b, 36b) having a concrete part and an end part projecting downward from the lower end of the concrete part, A plate or a precast wall rail member (2, 32) arranged on the ground cover, and a fixing device (11) for mechanical fixing is provided at a lower end of the end portion of the vertical fixing stripe, The end of the direction fixing muscle is embedded in the first filler (10) filled in the receiving hole. Here, the “fixing device for mechanical fixing” means a reinforcing bar main body in a cross section perpendicular to the extending direction of the reinforcing bar, which is provided at the end of the reinforcing bar to transmit the tensile force acting on the reinforcing bar to the concrete in the mechanical fixing. It means a plate or hump having a larger cross-sectional area.
この構成によれば、壁高欄を床版に接合するための作業において、配筋作業やコンクリートの打設作業を行う必要がないため、施工現場での作業を削減し、工期を短縮することができる。また、機械式定着の定着具があることによって、プレキャスト壁高欄の車両用防護柵としての強度性能及び変形性能を満たすことができる。 According to this configuration, in the work for joining the wall rail to the floor slab, it is not necessary to perform the bar arrangement work or the concrete placing work, so the work at the construction site can be reduced and the construction period can be shortened. it can. In addition, the presence of a mechanical fixing fixing device can satisfy the strength performance and deformation performance of a precast wall rail as a vehicle protective fence.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付構造は、上記構成において、前記プレキャスト壁高欄部材の橋軸方向の一方の端縁に上下方向に延在する受容溝（１５，３８）が設けられており、前記プレキャスト壁高欄部材の前記一方の端縁に隣接する他の前記プレキャスト壁高欄部材は、前記一方の端縁に対向する前記コンクリート部分の端縁から橋軸方向に突出してする端部を有する横方向定着筋（８ａ）を有し、前記横方向定着筋の前記端部の突出端に機械式定着の定着具（１１）が設けられ、前記横方向定着筋の前記端部が、前記受容溝内に充填された第２充填材（１６）内に埋設されていることを特徴とする。 The mounting structure for the precast wall rail according to at least some embodiments of the present invention is the above-described structure, wherein the receiving groove (15, 38) extending in the vertical direction at one edge in the bridge axis direction of the precast wall rail member. The other precast wall rail member adjacent to the one edge of the precast wall rail member protrudes in the direction of the bridge axis from the edge of the concrete portion facing the one edge. A horizontal fixing rebar (8a) having an end to be fixed, and a fixing tool (11) for mechanical fixing is provided at a protruding end of the end of the horizontal fixing rebar, The end is embedded in the second filler (16) filled in the receiving groove.
この構成によれば、橋軸方向に互いに隣接する壁高欄同士の接合も、施工現場での作業を削減し、工期を短縮することができ、強度性能及び変形性能を満たすことができる。 According to this configuration, the joining of the wall rails adjacent to each other in the bridge axis direction can also reduce the work on the construction site, shorten the construction period, and satisfy the strength performance and the deformation performance.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付構造は、上記構成において、前記縦方向定着筋及び／又は前記横方向定着筋の前記定着具は、先端側が後端側よりも細い円錐台形状であって、該定着具が設けられた鉄筋の延在方向に直交する断面において、該後端側の断面積が該鉄筋の本体部の断面積よりも大きいことを特徴とする。 The mounting structure of the precast wall rail according to at least some embodiments of the present invention is the above-described structure, wherein the fixing tool of the vertical fixing bar and / or the horizontal fixing bar has a front end side thinner than a rear end side. The cross-sectional area of the truncated cone is perpendicular to the extending direction of the reinforcing bar provided with the fixing tool, and the cross-sectional area on the rear end side is larger than the cross-sectional area of the main body of the reinforcing bar.
この構成によれば、プレキャスト壁高欄部材と、床版又は地覆との接合の確実性を高めることができる。 According to this structure, the certainty of joining with a precast wall railing member, a floor slab, or a ground cover can be improved.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付方法は、床版（３）又は該床版に設けられた地覆（４）の上面から下方に向かって形成された受容孔（９，３７）に第１充填材（１０）を充填するステップと、コンクリート部分の下端から下方に突出する端部を有する縦方向定着筋（７ａ，７ｂ，３６ｂ）を有するプレキャスト壁高欄部材（２，３２）を、前記縦方向定着筋の該端部が前記第１充填材の充填された前記受容孔に受容されるように配置するステップとを備え、前記縦方向定着筋の下方に突出した前記端部の端縁に機械式定着の定着具（１１）が形成されていることを特徴とする。 A method for attaching a precast wall rail according to at least some embodiments of the present invention includes a receiving hole (3) or a receiving hole formed downward from an upper surface of a ground cover (4) provided on the floor slab (4). 9, 37) with a first filler (10), and a precast wall rail member (2) having longitudinal anchor bars (7a, 7b, 36b) having ends projecting downward from the lower end of the concrete portion. , 32) is disposed so that the end portion of the longitudinal fixing muscle is received in the receiving hole filled with the first filler, and protrudes below the longitudinal fixing muscle. A fixing device (11) for mechanical fixing is formed on an edge of the end portion.
この構成によれば、壁高欄を床版に接合するための作業において、配筋作業やコンクリートの打設作業を行う必要がないため、施工現場での作業を削減し、工期を短縮することができる。また、機械式定着の定着具があることによって、プレキャスト壁高欄の車両用防護柵としての強度性能及び変形性能を満たすことができる。また、第１充填材が充填された受容孔に縦方向定着筋を挿入するため、第１充填材と縦方向定着筋との付着の確実性を高めることができる。また、縦方向定着筋が、プレキャスト壁高欄の延在方向に沿って延出するため、プレキャスト壁高欄を積み重ねて保管及び運搬する際に嵩張らない。 According to this configuration, in the work for joining the wall rail to the floor slab, it is not necessary to perform the bar arrangement work or the concrete placing work, so the work at the construction site can be reduced and the construction period can be shortened. it can. In addition, the presence of a mechanical fixing fixing device can satisfy the strength performance and deformation performance of a precast wall rail as a vehicle protective fence. In addition, since the vertical fixing streak is inserted into the receiving hole filled with the first filler, it is possible to improve the reliability of the adhesion between the first filler and the vertical fixing streak. In addition, since the longitudinal anchoring line extends along the extending direction of the precast wall rail, it is not bulky when the precast wall rail is stacked and stored and transported.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付方法は、上記方法の構成において、前記プレキャスト壁高欄部材は、橋軸方向の一方の端縁に上下方向に延在する受容溝（１５，３８）と、橋軸方向の他方の端縁の前記コンクリート部分から橋軸方向に突出する端部を有する横方向定着筋（８ａ）とを有し、前記配置するステップは、配置しようとする前記プレキャスト壁高欄部材を、該配置しようとする前記プレキャスト壁高欄部材の前記横方向定着筋の前記端部及び前記受容溝の一方を、配置済みの前記プレキャスト壁高欄部材の前記横方向定着筋の前記端部及び前記受容溝の他方に対して上下方向に整合させるように、該配置済みの前記プレキャスト壁高欄部材の上方に配置した後、下方に移動させることを含み、該移動を可能にするべく、前記プレキャスト壁高欄部材の前記受容溝は、上方又は下方の少なくとも一方が開放されており、前記横方向定着筋の橋軸方向に突出した前記端部の端縁に機械式定着の定着具（１１）が形成されており、当該取付方法は、前記配置するステップの後に、前記床版又は前記地覆と前記プレキャスト壁高欄部材の前記コンクリート部分との間に、目地材（６）を注入するステップと、前記受容溝に第２充填材（１６）を充填するステップとを更に備えることを特徴とする。 According to at least some embodiments of the present invention, the precast wall rail is attached to the receiving groove extending in the vertical direction at one end edge in the bridge axis direction. 15 and 38) and a transverse anchoring bar (8a) having an end projecting in the bridge axis direction from the concrete portion of the other edge in the bridge axis direction, and the step of arranging attempts to arrange The precast wall rail member to be arranged is arranged in the lateral fixing bar of the precast wall rail member in which one of the end portion of the horizontal fixing bar and the receiving groove of the precast wall rail member to be arranged is arranged. Including disposing the upper portion of the precast wall rail member arranged in the vertical direction with respect to the other end of the receiving groove and the other of the receiving groove, and then moving the precast wall rail member downward. In order to enable the movement, at least one of the upper and lower receiving grooves of the precast wall rail member is open, and the edge of the end projecting in the bridge axis direction of the lateral fixing muscle A fixing device (11) for mechanical fixing is formed, and the mounting method is, after the placing step, between the floor slab or the ground cover and the concrete portion of the precast wall rail member, The step of injecting the joint material (6) and the step of filling the receiving groove with the second filler (16) are further provided.
この構成によれば、プレキャスト壁高欄部材間の接合についても、施工現場での作業を削減し、工期を短縮することができ、強度性能及び変形性能を満たすことができる。また、縦方向定着筋及び横方向定着筋が、プレキャスト壁高欄部材の主面に対して平行に延出するため、プレキャスト壁高欄を積み重ねて保管及び運搬する際に嵩張らない。 According to this structure, also about the joining between precast wall balustrade members, the work on a construction site can be reduced, a construction period can be shortened, and strength performance and deformation performance can be satisfied. Further, since the vertical fixing bars and the horizontal fixing bars extend in parallel to the main surface of the precast wall rail member, the precast wall rails are not bulky when stacked and stored and transported.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付方法は、上記方法の構成において、前記目地材を注入するステップは、上方が開放された前記受容溝を介して挿入された注入ホースから、ポンプにより圧送された前記目地材を注入することを含むことを特徴とする。 An attachment method of a precast wall rail according to at least some embodiments of the present invention is the above-described method, wherein the step of injecting the joint material is an injection hose inserted through the receiving groove whose upper side is open And injecting the joint material pumped by the pump.
この構成によれば、型枠に注入口を設けずとも、プレキャスト壁高欄部材の下端近傍から目地材を注入することができる。 According to this configuration, the joint material can be injected from the vicinity of the lower end of the precast wall rail member without providing an injection port in the mold.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付方法は、上記構成において、前記縦方向定着筋及び／又は前記横方向定着筋の前記定着具は、先端側が後端側よりも細い円錐台形状であって、該定着具が設けられた鉄筋の延在方向に直交する断面において、該後端側の断面積が該鉄筋の本体部の断面積よりも大きいことを特徴とする。 The mounting method of the precast wall rail according to at least some embodiments of the present invention is the above-described configuration, wherein the fixing tool of the vertical fixing bar and / or the horizontal fixing bar has a front end side thinner than a rear end side. The cross-sectional area of the truncated cone is perpendicular to the extending direction of the reinforcing bar provided with the fixing tool, and the cross-sectional area on the rear end side is larger than the cross-sectional area of the main body of the reinforcing bar.
この構成によれば、第１充填材が充填された受容孔に縦方向定着筋を挿入するときに、円錐台形状の定着具の先端側に気泡がたまり難く、かつ後端側の定着力が大きくなるため、プレキャスト壁高欄部材と、床版又は地覆との接合の確実性を高めることができる。 According to this configuration, when the longitudinal fixing muscle is inserted into the receiving hole filled with the first filler, it is difficult for bubbles to collect on the front end side of the truncated cone-shaped fixing tool, and the fixing force on the rear end side is reduced. Since it becomes large, the certainty of joining with a precast wall railing member, a floor slab, or a ground cover can be improved.
本発明の少なくともいくつかの実施形態に係るプレキャスト壁高欄の取付方法は、上記の方法の構成の何れかにおいて、前記受容孔（９）は、前記地覆に設けられ、前記地覆は、工場で、プレキャストコンクリート部材からなる前記床版と一体化させるように製造されることを特徴とする。 A precast wall rail attachment method according to at least some embodiments of the present invention is any one of the above-described methods, wherein the receiving hole (9) is provided in the ground cover, and the ground cover is a factory. Thus, it is manufactured so as to be integrated with the floor slab made of a precast concrete member.
この構成によれば、床版の厚さが、縦方向定着筋の定着長さに足りない場合でも、地覆を設けることにより定着長さを確保でき、かつ、地覆が工場二次製品であるため、施工現場での作業を増やさない。 According to this configuration, even when the thickness of the floor slab is insufficient for the fixing length of the longitudinal fixing muscle, the fixing length can be secured by providing the ground cover, and the ground cover is a secondary product of the factory. Therefore, work on the construction site is not increased.
本発明によれば、施工現場での労力を削減し、かつ工期を短縮し、更に接合に関与する部材の連結を担保できるプレキャスト壁高欄の取付構造及び取付方法を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the construction structure and attachment method of the precast wall rail which can reduce the labor on a construction site, shorten a construction period, and can ensure the connection of the member in connection with joining can be provided.
以下、本発明に係る実施形態について、図面を参照しながら説明する。なお、図２〜図７においては、各部材のコンクリート部分はその輪郭のみを実線で示し、その中に配置される鉄筋等をコンクリート部分を透視したように示す。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings. 2-7, the concrete part of each member shows only the outline with a continuous line, and shows the reinforcing bars etc. which are arrange | positioned in it as seeing through the concrete part.
＜第１実施形態＞
図１及び図２は、それぞれ、第１実施形態に係る壁高欄の取付構造１を示す模式的斜視図及び橋軸方向に直交する断面での断面図である。橋梁に於けるプレキャスト壁高欄部材２は、床版３の橋軸に直交し、橋面に平行な方向（以下、幅方向という）の側端部に、地覆４を介して接合されるとともに、橋軸方向に隣接する他のプレキャスト壁高欄部材２と接合されている。
<First Embodiment>
FIG. 1 and FIG. 2 are a schematic perspective view showing a wall rail attachment structure 1 according to the first embodiment and a cross-sectional view in a cross section orthogonal to the bridge axis direction, respectively. The precast wall rail member 2 in the bridge is joined to a side end portion in a direction (hereinafter referred to as a width direction) perpendicular to the bridge axis of the floor slab 3 through the ground cover 4. The other precast wall rail member 2 adjacent to the bridge axis direction is joined.
床版３はプレキャストコンクリート部材からなる。プレキャスト床版３の側端部からは、地覆４と床版３とを接合する接合鉄筋５の一部が露出している。接合鉄筋５は、橋軸方向から見てループ形状を呈しており、ループ形状の上部及び幅方向の外側部分がプレキャスト床版３の側端部の上面及び側面から露出している。なお、床版３を施工現場で作成してもよい。また、床版３は、プレストレストコンクリートであってもよく、鉄筋コンクリートであってもよい。 The floor slab 3 is made of a precast concrete member. From the side end portion of the precast floor slab 3, a part of the joining reinforcing bar 5 that joins the ground cover 4 and the floor slab 3 is exposed. The joining rebar 5 has a loop shape when viewed from the bridge axis direction, and an upper portion of the loop shape and an outer portion in the width direction are exposed from the upper surface and the side surface of the side end portion of the precast floor slab 3. The floor slab 3 may be created at the construction site. Further, the floor slab 3 may be prestressed concrete or reinforced concrete.
地覆４は、工場二次製品であることが好ましい。地覆４は、接合鉄筋５の床版３から露出した部分を埋設するようにコンクリートを打設することによって形成され、床版３の側端部の上面と幅方向の外面とを覆う。 The ground cover 4 is preferably a factory secondary product. The ground cover 4 is formed by placing concrete so as to bury a portion exposed from the floor slab 3 of the joining reinforcing bar 5, and covers the upper surface of the side end portion of the floor slab 3 and the outer surface in the width direction.
プレキャスト壁高欄部材２は、地覆４の上方に配置され、両者のコンクリート部分の間には無収縮モルタル等の目地材６が配置される。プレキャスト壁高欄部材２は、橋軸に直交する方向に延在する縦方向鉄筋７と、橋軸方向に延在する横方向鉄筋８とを有する。プレキャスト壁高欄部材２のコンクリート部分の下面からは、縦方向鉄筋７の下端部が下方に向かって突出しており、地覆４の上面には、下方に向かって非貫通孔が形成されて、縦方向鉄筋７の下端部を受容する受容孔９となっている。縦方向鉄筋７の下端部は、無収縮モルタル等の充填材１０によって受容孔９に定着している。１つの受容孔９に１つの縦方向鉄筋７の下端部が受容されることが好ましいが、受容孔９を長孔とし、１つの受容孔９に複数の縦方向鉄筋７の下端部が受容されてもよい。縦方向鉄筋７の下端部の端縁には、機械式定着の定着具１１が設けられている。機械式定着の定着具１１とは、機械式定着において鉄筋に作用する引張力をコンクリートに伝達するために鉄筋端部に設けられる、鉄筋の延在方向に直交する断面において鉄筋本体よりも断面積の大きな、板又はこぶ状のものを意味する。本実施形態における定着具１１は、こぶ状のものであることが好ましく、先端側が後端側よりも細い円錐台形状であって、定着具１１が設けられた鉄筋の延在方向に直交する断面において、後端側の断面積が鉄筋の中間部の断面積よりも大きい形状とすることが更に好ましい。 The precast wall rail member 2 is disposed above the ground cover 4, and a joint material 6 such as a non-shrink mortar is disposed between the two concrete portions. The precast wall rail member 2 has a longitudinal reinforcing bar 7 extending in a direction orthogonal to the bridge axis and a lateral reinforcing bar 8 extending in the bridge axis direction. From the lower surface of the concrete portion of the precast wall rail member 2, the lower end portion of the longitudinal rebar 7 protrudes downward, and a non-through hole is formed on the upper surface of the ground cover 4 downward. A receiving hole 9 for receiving the lower end portion of the directional reinforcing bar 7 is formed. A lower end portion of the longitudinal reinforcing bar 7 is fixed to the receiving hole 9 by a filler 10 such as a non-shrink mortar. Although it is preferable that the lower end of one longitudinal reinforcing bar 7 is received in one receiving hole 9, the receiving hole 9 is a long hole and the lower ends of a plurality of longitudinal reinforcing bars 7 are received in one receiving hole 9. May be. A fixing tool 11 for mechanical fixing is provided at the edge of the lower end portion of the longitudinal reinforcing bar 7. The fixing device 11 for mechanical fixing is a cross-sectional area that is provided at the end of the reinforcing bar in order to transmit a tensile force acting on the reinforcing bar to the concrete in the mechanical fixing, and that is perpendicular to the extending direction of the reinforcing bar. Means a large plate or hump. The fixing tool 11 in the present embodiment is preferably a hump-like one, and has a truncated cone shape whose tip side is thinner than the rear end side, and a cross section perpendicular to the extending direction of the reinforcing bar on which the fixing tool 11 is provided. Further, it is more preferable that the cross-sectional area on the rear end side is larger than the cross-sectional area of the intermediate portion of the reinforcing bar.
縦方向鉄筋７は、第１縦方向定着筋７ａと、第１縦方向定着筋７ａよりも幅方向の内側のコンクリート部分から下方に突出する第２縦方向定着筋７ｂとを含む。第１縦方向定着筋７ａと第２縦方向定着筋７ｂとは、橋軸方向に沿ってずれた位置に交互に配置されることが好ましい（図４参照）。 The vertical reinforcing bar 7 includes a first vertical fixing bar 7a and a second vertical fixing bar 7b that protrudes downward from the inner concrete portion in the width direction of the first vertical fixing bar 7a. The first vertical fixing stripes 7a and the second vertical fixing stripes 7b are preferably alternately arranged at positions shifted along the bridge axis direction (see FIG. 4).
第１縦方向定着筋７ａの全体は、鉛直方向に沿って延在する。第２縦方向定着筋７ｂのプレキャスト壁高欄部材２のコンクリート部分に埋設された部分は、第１縦方向定着筋７ａを囲うように、プレキャスト壁高欄部材２のコンクリート部分の内側の側面、上部及び外側の側面に沿って配置され、上部で湾曲している。プレキャスト壁高欄部材２のコンクリート部分の内部で、第２縦方向定着筋７ｂと協働して鉄筋がループ形状となるように、コンクリート部分の下部において、第２縦方向定着筋７ｂの幅方向の内側部分と外側部分との下側を繋ぐように連結したコ字状の補強鉄筋１２を設けることが好ましい。 The entirety of the first vertical fixing muscle 7a extends along the vertical direction. The portion embedded in the concrete portion of the precast wall rail member 2 of the second longitudinal fixing bar 7b surrounds the first vertical fixing bar 7a, the side surface on the inner side of the concrete portion of the precast wall rail member 2, the upper part, and Located along the outer side and curved at the top. Inside the concrete portion of the precast wall rail member 2, in the lower part of the concrete portion, in the width direction of the second longitudinal fixing bar 7 b so that the reinforcing bar has a loop shape in cooperation with the second vertical fixing bar 7 b. It is preferable to provide a U-shaped reinforcing bar 12 connected so as to connect the lower side of the inner part and the outer part.
また、地覆４とプレキャスト壁高欄部材２との間のせん断補強のため、地覆４の上面には、幅方向の外側が内側よりも高くなるような段差によって形成されたせん断キー１３が形成され、プレキャスト壁高欄部材２のコンクリート部分の下面には、せん断キー１３に対応するように、幅方向の外側が内側よりも上方に凹んだ肩部１４が形成され、せん断キー１３と肩部１４とは、目地材６を挟んで対向している。 Further, in order to reinforce the shear between the ground cover 4 and the precast wall rail member 2, the upper surface of the ground cover 4 is formed with a shear key 13 formed by a step so that the outer side in the width direction is higher than the inner side. In addition, on the lower surface of the concrete portion of the precast wall rail member 2, a shoulder portion 14 whose outer side in the width direction is recessed upward than the inner side so as to correspond to the shear key 13 is formed. Are opposed to each other with the joint material 6 interposed therebetween.
横方向鉄筋８は、プレキャスト壁高欄部材２のコンクリート部分の橋軸方向の一方の側面から端部が突出した横方向定着筋８ａと、全体がプレキャスト壁高欄部材２のコンクリート部分に埋設された横方向筋８ｂとを含む。横方向定着筋８ａは、第１縦方向定着筋７ａに沿って並ぶように配置される。横方向定着筋８ａの突出した先端には、機械式定着の定着具１１が設けられている。本実施例では、横方向鉄筋８の定着具１１は、縦方向鉄筋７の定着具１１と同じ形状を有するが、異なる形状の定着具１１としてもよい。プレキャスト壁高欄部材２のコンクリート部分における、横方向定着筋８ａが設けられた側と反対側の橋軸方向の側面には、鉛直方向に沿って受容溝１５が設けられており、受容溝１５は、橋軸方向に隣接して配置された他のプレキャスト壁高欄部材２の横方向定着筋８ａの突出した端部を受容する。受容溝１５の上端及び下端は開放されている。受容溝１５には、無収縮モルタル等の充填材１６が充填されている。横方向筋８ｂは、第２縦方向定着筋７ｂに沿って並ぶように配置されている。受容溝１５は、幅方向に互いに対向する２つの内側面を有することが好ましいが、内側面を１つとして、充填材１６を充填する際に、その反対側に型枠を設けてもよい。 The lateral rebar 8 includes a lateral fixing bar 8a whose end protrudes from one side surface in the bridge axis direction of the concrete portion of the precast wall rail member 2 and a horizontal portion that is embedded in the concrete portion of the precast wall rail member 2 as a whole. Directional stripe 8b. The horizontal fixing muscles 8a are arranged so as to be aligned along the first vertical fixing muscles 7a. A fixing tool 11 for mechanical fixing is provided at the protruding tip of the lateral fixing muscle 8a. In the present embodiment, the fixing tool 11 of the horizontal reinforcing bar 8 has the same shape as the fixing tool 11 of the vertical reinforcing bar 7, but may be a fixing tool 11 having a different shape. A receiving groove 15 is provided along the vertical direction on the side surface in the bridge axis direction on the opposite side of the concrete portion of the precast wall rail member 2 from the side where the lateral fixing bar 8a is provided. The projecting end of the lateral fixing bar 8a of another precast wall rail member 2 arranged adjacent to the bridge axis direction is received. The upper and lower ends of the receiving groove 15 are open. The receiving groove 15 is filled with a filler 16 such as a non-shrink mortar. The horizontal stripes 8b are arranged so as to line up along the second vertical fixation stripes 7b. The receiving groove 15 preferably has two inner surfaces facing each other in the width direction. However, when filling the filler 16 with one inner surface, a mold may be provided on the opposite side.
目地材６や、充填材１０，１６内に配置される第１縦方向定着筋７ａ、第２縦方向定着筋７ｂ及び横方向定着筋８ａは、腐食を防ぐためにエポキシ樹脂等で塗装されていることが好ましい。 The first longitudinal fixing stripes 7a, the second vertical fixing stripes 7b, and the lateral fixation stripes 8a disposed in the joint material 6 and the fillers 10 and 16 are coated with an epoxy resin or the like to prevent corrosion. It is preferable.
図３及び図４を参照して、第１実施形態に係る取付構造１の施工手順を説明する。図３は、橋軸に直交する断面視において、施工手順を示しており、図４は、図３（ｂ）に相当する工程を幅方向の内側から見た正面図である。 With reference to FIG.3 and FIG.4, the construction procedure of the attachment structure 1 which concerns on 1st Embodiment is demonstrated. FIG. 3 shows a construction procedure in a cross-sectional view orthogonal to the bridge axis, and FIG. 4 is a front view of a process corresponding to FIG. 3B viewed from the inner side in the width direction.
まず、プレキャスト部材として床版３が製造される。次に、図３（ａ）に示すように地覆４が、工場二次製品として床版３に結合するように製造される。受容孔９は、箱抜き孔として形成されることが好ましく、その内面は、充填材１０の付着を高めるために螺旋状のねじが切ってあることが好ましい。 First, the floor slab 3 is manufactured as a precast member. Next, as shown in FIG. 3A, the ground cover 4 is manufactured so as to be coupled to the floor slab 3 as a factory secondary product. The receiving hole 9 is preferably formed as a box opening hole, and its inner surface is preferably threaded in a spiral to enhance the adhesion of the filler 10.
地覆４が結合された床版３は、施工現場に搬送され、所定の位置に設置される。図４に示すように、橋軸方向に沿って互いに隣接する床版３のプレキャスト部材は、互いの橋軸方向に延在する互いの主筋１７を正面視でループ状に重ね合わせ、そのループに沿って幅方向に延在する補強鉄筋１８を設置し、その部分にコンクリートを打設して現場打ちコンクリート部１９を形成することによって接合される。 The floor slab 3 combined with the ground cover 4 is transported to a construction site and installed at a predetermined position. As shown in FIG. 4, the precast members of the floor slab 3 adjacent to each other along the bridge axis direction overlap each other's main reinforcing bars 17 extending in the bridge axis direction in a loop shape in front view. The reinforcing reinforcing bars 18 extending in the width direction are installed, and the concrete is cast on the portions to form the in-situ concrete 19.
次に、図３（ｂ）及び図４に示すように受容孔９に充填材１０を充填する。クレーン等により、プレキャスト壁高欄部材２は配置すべき位置の上方まで移動させ、受容孔９に第１縦方向定着筋７ａ及び第２縦方向定着筋７ｂが受容され、かつ受容溝１５に設置済みの隣接するプレキャスト壁高欄部材２の横方向定着筋８ａが受容されるように、プレキャスト壁高欄部材２を下ろしていき、所定の位置に配置する。地覆４の上面には据付用アンカーボルト２０が設けられているため、地覆４の上面とプレキャスト壁高欄部材２のコンクリート部分の下面との間には、目地材６を注入するべき空間が形成される。なお、プレキャスト壁高欄部材２を下ろすときに、設置しようとするプレキャスト壁高欄部材２の受容溝１５に、設置済みのプレキャスト壁高欄部材２の横方向定着筋８ａを挿入することに代えて、設置しようとするプレキャスト壁高欄部材２の横方向定着筋８ａを、設置済みのプレキャスト壁高欄部材２の受容溝１５に挿入してもよい。この場合は、受容溝１５の下端部は、横方向定着筋８ａが通過させる必要がないため、下方に向かって閉じていてもよい。 Next, as shown in FIGS. 3B and 4, the receiving hole 9 is filled with a filler 10. The precast wall rail member 2 is moved to a position above the position to be arranged by a crane or the like, and the first vertical fixing muscle 7a and the second vertical fixing muscle 7b are received in the receiving hole 9 and installed in the receiving groove 15. The precast wall rail member 2 is lowered and placed at a predetermined position so that the lateral fixing muscle 8a of the adjacent precast wall rail member 2 is received. Since the anchor bolts 20 for installation are provided on the upper surface of the ground cover 4, there is a space for injecting the joint material 6 between the upper surface of the ground cover 4 and the lower surface of the concrete portion of the precast wall rail member 2. It is formed. In addition, when lowering the precast wall rail member 2, instead of inserting the lateral fixing bar 8a of the installed precast wall rail member 2 into the receiving groove 15 of the precast wall rail member 2 to be installed, The lateral fixing bar 8a of the precast wall rail member 2 to be installed may be inserted into the receiving groove 15 of the precast wall rail member 2 that has been installed. In this case, the lower end portion of the receiving groove 15 does not need to be passed through the lateral fixing muscle 8a, and may be closed downward.
図３（ｃ）に示すように、目地材６用及び受容溝１５の充填材１６用の型枠２１を設置する。次に、目地材６の注入ホースを、受容溝１５の上部から挿入し、その先端を受容溝１５の下端付近に配置し、モルタルポンプにより目地材６を圧送する。目地材６の注入が終わったら、注入ホースの位置を変えずに、又は注入ホースを引き上げながら受容溝１５用の充填材１６を注入する。 As shown in FIG. 3 (c), a mold 21 for the joint material 6 and for the filler 16 in the receiving groove 15 is installed. Next, an injection hose for the joint material 6 is inserted from the upper part of the receiving groove 15, the tip thereof is disposed near the lower end of the receiving groove 15, and the joint material 6 is pumped by a mortar pump. When the injection of the joint material 6 is completed, the filler 16 for the receiving groove 15 is injected without changing the position of the injection hose or pulling up the injection hose.
この方法によれば、機械式定着の定着具１１を有する鉄筋を使用することにより、プレキャスト壁高欄部材２を地覆４及び床版３に接合するための必要な接合強度が得られるため、従来工法で行われていたループ継手や、ＰＣ鋼材での連結、コンクリートの打設等を行う必要がない。また、型枠２１の設置も目地材６及び充填材１６用のものだけで済むため、外部足場設置作業や、型枠２１の設置作業が簡易になる。よって、施工現場での作業を大幅に削減でき、工期も短縮できる。 According to this method, by using the reinforcing bar having the fixing device 11 for mechanical fixing, the necessary joint strength for joining the precast wall rail member 2 to the ground cover 4 and the floor slab 3 can be obtained. There is no need to perform loop joints, connection with PC steel, concrete placement, etc., which have been performed by the construction method. Moreover, since the installation of the mold 21 is only required for the joint material 6 and the filler 16, the external scaffold installation work and the installation work of the mold 21 are simplified. Therefore, the work on the construction site can be greatly reduced, and the construction period can be shortened.
床版３の厚さが第１縦方向定着筋７ａ及び第２縦方向定着筋７ｂの定着長さに足りない場合でも、地覆４を設けることにより定着長さを確保できる。 Even when the thickness of the floor slab 3 is not sufficient for the fixing length of the first vertical fixing stripes 7a and the second vertical fixing stripes 7b, the fixing length can be secured by providing the ground cover 4.
互いに隣接するプレキャスト壁高欄部材２同士の接合も、機械式定着の定着具１１を有する鉄筋を使用することによって必要な強度が得られるため、接合用の鉄筋の結束作業等が不要となり、施工現場での作業を軽減できる。第１縦方向定着筋７ａ及び第２縦方向定着筋７ｂの定着具１１が円錐台形状であるため、充填材１０が充填された受容孔９に第１縦方向定着筋７ａ及び第２縦方向定着筋７ｂを挿入するときに、定着具１１の先端に気泡がたまり難い。 Since the necessary strength can be obtained by using the reinforcing bar having the fixing device 11 of the mechanical fixing for joining the precast wall rail members 2 adjacent to each other, the binding work of the reinforcing bars for joining becomes unnecessary, and the construction site Work at can be reduced. Since the fixing tool 11 of the first vertical fixing stripe 7a and the second vertical fixing stripe 7b has a truncated cone shape, the first vertical fixing stripe 7a and the second vertical direction are received in the receiving hole 9 filled with the filler 10. When the fixing muscle 7b is inserted, bubbles are unlikely to collect at the tip of the fixing tool 11.
また、機械式定着の定着具１１を有することにより、定着長さを短くすることができ、プレキャスト壁高欄部材２ではなく、床版３及び地覆４の側に受容孔９を設けることができる。床版３及び地覆４の側に受容孔９を設けるため、受容孔９に充填材１０を充填した後に、第１縦方向定着筋７ａ及び第２縦方向定着筋７ｂを受容孔９に挿入できる。そのため、鉄筋を孔に挿入後に充填材１０を充填する場合に比べて、充填材１０の第１縦方向定着筋７ａ及び第２縦方向定着筋７ｂへの付着の確実性が高い。 Further, by having the fixing device 11 for mechanical fixing, the fixing length can be shortened, and the receiving hole 9 can be provided on the side of the floor slab 3 and the ground cover 4 instead of the precast wall railing member 2. . In order to provide the receiving hole 9 on the side of the floor slab 3 and the ground cover 4, the first vertical fixing muscle 7 a and the second vertical fixing muscle 7 b are inserted into the receiving hole 9 after filling the receiving hole 9 with the filler 10. it can. Therefore, as compared with the case where the filler 10 is filled after the reinforcing bars are inserted into the holes, the reliability of the attachment of the filler 10 to the first vertical fixing bars 7a and the second vertical fixing bars 7b is high.
また、プレキャスト壁高欄部材２において、コンクリート部分から延出する第１縦方向定着筋７ａ、第２縦方向定着筋７ｂ及び横方向定着筋８ａが、壁状のプレキャスト壁高欄部材２の主面に平行に突出しているため、積み重ねて保管及び運搬する際に嵩張らない。 Further, in the precast wall rail member 2, the first vertical fixing bars 7a, the second vertical fixing bars 7b, and the horizontal fixing bars 8a extending from the concrete portion are formed on the main surface of the wall-shaped precast wall rail member 2. Because it protrudes in parallel, it is not bulky when stacked and stored and transported.
＜第２実施形態＞
次に、図５〜７を参照して、第２実施形態に係る取付構造３１について説明する。説明に当たって、第１の実施形態と共通する構成は、その説明を省略し同一の符号を付す。
Second Embodiment
Next, the attachment structure 31 according to the second embodiment will be described with reference to FIGS. In the description, the description of the configuration common to the first embodiment is omitted, and the same reference numerals are given.
図５は、それぞれ、第２実施形態に係る壁高欄の取付構造３１を示す橋軸方向に直交する断面での断面図である。橋梁に於けるプレキャスト壁高欄部材３２は、床版３３の幅方向の側端部に接合されるとともに、橋軸方向に隣接する他のプレキャスト壁高欄部材３２と接合されている。 FIG. 5: is sectional drawing in the cross section orthogonal to the bridge-axis direction which shows the attachment structure 31 of the wall rail which concerns on 2nd Embodiment, respectively. The precast wall rail member 32 in the bridge is joined to the side end portion in the width direction of the floor slab 33 and is joined to another precast wall rail member 32 adjacent in the bridge axis direction.
床版３３は、プレキャスト部分３３ａと後施工部分３３ｂとを有する。プレキャスト部分に対しては、ＰＣ鋼材３４による横締め緊張が施工現場においてなされる。また、プレキャスト部分３３ａは、後施工部分３３ｂを接合させるための、プレキャスト部分３３ａから露出から部分的に露出する鉄筋３５を有する。鉄筋３５は、コ字状に屈曲した中間部分が、プレキャスト部分３３ａから露出している。後施工部分３３ｂは、鉄筋３５のコ字状に屈曲した中間部分及びＰＣ鋼材３４の定着端部を埋設し、床版３３の幅方向の端部を構成している。 The floor slab 33 has a precast portion 33a and a post-installed portion 33b. The precast portion is subjected to lateral fastening tension by the PC steel material 34 at the construction site. Moreover, the precast part 33a has the reinforcing bar 35 partially exposed from exposure from the precast part 33a for joining the post-construction part 33b. In the reinforcing bar 35, an intermediate portion bent in a U-shape is exposed from the precast portion 33a. The post-installed portion 33 b embeds an intermediate portion of the reinforcing bar 35 bent in a U shape and a fixing end portion of the PC steel material 34, and constitutes an end portion in the width direction of the floor slab 33.
プレキャスト壁高欄部材３２は、床版３３の側端部の上方に配置され、両者のコンクリート部分の間には無収縮モルタル等の目地材６が配置される。プレキャスト壁高欄部材３２は、橋軸に直交する方向に延在する縦方向鉄筋３６と、橋軸方向に延在する横方向鉄筋８とを有する。縦方向鉄筋３６は、プレキャスト壁高欄部材３２のコンクリート部分に全体が埋設され、該コンクリート部分の壁面に沿ってループ状に形成されたループ筋３６ａと、両端部が該コンクリート部分から突出し、該コンクリート部分に埋設された中間部がループ筋３６ａの下側部分とループを形成するように配置されたＵ字状の縦方向定着筋３６ｂとを有する。床版３３のプレキャスト部分３３ａの側端部及び後施工部分３３ｂの上面には、それぞれ１列ずつ、縦方向定着筋３６ｂの突出した端部を受容する受容孔３７が設けられている。縦方向定着筋３６ｂの両端部は、無収縮モルタル等の充填材１０によって受容孔３７に定着している。縦方向定着筋３６ｂの下方を向いた両端部の先端部には、機械式定着の定着具１１が設けられている。縦方向定着筋３６ｂは、橋軸に直交するように配置されるため、その両端部は幅方向に整合している。従って、２列の受容孔３７も幅方向に整合している。受容孔３７は、ＰＣ鋼材３４に対して橋軸方向にずれた位置に設けられる。 The precast wall rail member 32 is disposed above the side end portion of the floor slab 33, and a joint material 6 such as a non-shrink mortar is disposed between the two concrete portions. The precast wall rail member 32 has a longitudinal reinforcing bar 36 extending in a direction orthogonal to the bridge axis and a lateral reinforcing bar 8 extending in the bridge axis direction. The longitudinal rebar 36 is entirely embedded in the concrete portion of the precast wall rail member 32, and has a loop reinforce 36a formed in a loop shape along the wall surface of the concrete portion, and both ends projecting from the concrete portion. The intermediate part embedded in the part has a lower part of the loop line 36a and a U-shaped vertical fixing line 36b arranged so as to form a loop. Receiving holes 37 for receiving the protruding end portions of the longitudinal fixing bars 36b are provided in each row on the side end portion of the precast portion 33a of the floor slab 33 and the upper surface of the post-installed portion 33b. Both ends of the longitudinal fixing muscle 36b are fixed to the receiving hole 37 by the filler 10 such as non-shrink mortar. A fixing device 11 for mechanical fixing is provided at the tip of both end portions facing downward of the vertical fixing stripe 36b. Since the vertical fixing bars 36b are arranged so as to be orthogonal to the bridge axis, both ends thereof are aligned in the width direction. Accordingly, the two rows of receiving holes 37 are also aligned in the width direction. The receiving hole 37 is provided at a position shifted in the bridge axis direction with respect to the PC steel material 34.
プレキャスト壁高欄部材３２のコンクリート部分における、横方向定着筋８ａが設けられた側と反対側の橋軸方向の側面には、鉛直方向に沿って受容溝３８が設けられており、受容溝３８は、橋軸方向に隣接して配置された他のプレキャスト壁高欄部材３２の横方向定着筋８ａの突出した端部を受容する。受容溝３８の上端側は開放されているが、下端側は閉じている。受容溝３８には、無収縮モルタル等の充填材１６が充填されている。横方向筋８ｂは、ループ筋３６ａに沿って並ぶように配置され、横方向定着筋８ａは、ループ筋３６ａの幅方向の外側部分と内側部分との中間位置に配置され、鉛直方向に沿って並んでいる。 In the concrete portion of the precast wall rail member 32, a receiving groove 38 is provided along the vertical direction on the side surface in the bridge axis direction opposite to the side on which the lateral fixing reinforcement 8a is provided. The projecting end of the lateral fixing bar 8a of another precast wall rail member 32 arranged adjacent to the bridge axis direction is received. The upper end side of the receiving groove 38 is open, but the lower end side is closed. The receiving groove 38 is filled with a filler 16 such as a non-shrink mortar. The lateral stripes 8b are arranged so as to be aligned along the loop stripes 36a, and the lateral fixing stripes 8a are arranged at an intermediate position between the outer portion and the inner portion in the width direction of the loop stripes 36a, and along the vertical direction. Are lined up.
目地材６や、充填材１０，１６内に配置される縦方向定着筋３６ｂ及び横方向定着筋８ａは、腐食を防ぐためにエポキシ樹脂等で塗装されていることが好ましい。 The joint material 6 and the longitudinal fixing stripes 36b and the lateral fixing stripes 8a disposed in the fillers 10 and 16 are preferably coated with an epoxy resin or the like in order to prevent corrosion.
図６及び図７を参照して、第２実施形態に係る取付構造３１の施工手順を説明する。図６は、橋軸に直交する断面視において、施工手順を示しており、図７は、図６（ｃ）に相当する工程を幅方向の内側から見た正面図である。 With reference to FIG.6 and FIG.7, the construction procedure of the attachment structure 31 which concerns on 2nd Embodiment is demonstrated. FIG. 6 shows a construction procedure in a cross-sectional view orthogonal to the bridge axis, and FIG. 7 is a front view of a process corresponding to FIG. 6C viewed from the inner side in the width direction.
まず、プレキャスト部材として床版３３のプレキャスト部分３３ａが製造される。プレキャスト部分３３ａに設けられる受容孔３７は、工場製作の時点で箱抜き孔として設けられる。次に、プレキャスト部分３３ａが施工現場に搬送され、図６（ａ）に示すように、ジャッキ３９を用いてＰＣ鋼材３４の横締め緊張が行われる。 First, the precast part 33a of the floor slab 33 is manufactured as a precast member. The receiving hole 37 provided in the precast portion 33a is provided as a box opening hole at the time of factory manufacture. Next, the precast portion 33a is transported to the construction site, and as shown in FIG.
次に、図６（ｂ）に示すように、型枠４０を設置し、床版３３の後施工部分３３ｂが、ＰＣ鋼材３４の端部及び鉄筋３５の露出した部分を埋設するように打設される。後施工部分３３ｂの受容孔３７は、箱抜き孔として設けられる。なお、第１実施形態と同様に、プレキャスト部分３３ａ及び後施工部分３３ｂの受容孔３７の内面は、充填材１０の付着を高めるために螺旋状のねじが切ってあることが好ましい。 Next, as shown in FIG. 6 (b), the formwork 40 is installed, and the post-processed portion 33 b of the floor slab 33 is placed so as to embed the end portion of the PC steel material 34 and the exposed portion of the reinforcing bar 35. Is done. The receiving hole 37 of the post-installed portion 33b is provided as a box opening hole. As in the first embodiment, it is preferable that the inner surfaces of the receiving holes 37 of the precast portion 33a and the post-installed portion 33b are spirally threaded in order to enhance the adhesion of the filler 10.
次に、図６（ｃ）及び図４に示すように受容孔３７に充填材１０を充填する。クレーン等により、プレキャスト壁高欄部材３２は配置すべき位置の上方まで移動させ、受容孔３７に縦方向定着筋３６ｂの両端部が受容され、かつ横方向定着筋８ａが、設置済みの隣接するプレキャスト壁高欄部材３２の受容溝３８に受容されるように、プレキャスト壁高欄部材３２を下ろして行き、所定の位置に配置する。床版３３の上面には据付用アンカーボルト２０が設けられているため、床版３３の上面とプレキャスト壁高欄部材３２のコンクリート部分の下面との間には、目地材６を注入するべき空間が形成される。なお、設置済みのプレキャスト壁高欄部材３２の受容溝３８に上方から横方向定着筋８ａを挿入できるように、受容溝３８に対して上下方向に重なる位置に配置されるループ筋３６ａには、受容溝を通過する部分の鉄筋が設けられていない。そこで、補強のため、受容溝３８が形成される部分の橋軸方向における上部のないループ筋３６ａの配置間隔は、中間部のループ筋３６ａの配置間隔に比べて短くなっている。 Next, as shown in FIGS. 6C and 4, the receiving hole 37 is filled with the filler 10. The precast wall rail member 32 is moved above the position to be arranged by a crane or the like, and both ends of the longitudinal fixing bar 36b are received in the receiving hole 37, and the lateral fixing bar 8a is installed in the adjacent precast that has been installed. The precast wall rail member 32 is lowered so as to be received in the receiving groove 38 of the wall rail member 32 and is arranged at a predetermined position. Since the anchor bolts 20 for installation are provided on the upper surface of the floor slab 33, there is a space for injecting the joint material 6 between the upper surface of the floor slab 33 and the lower surface of the concrete portion of the precast wall rail member 32. It is formed. It should be noted that the loop streaks 36a arranged in the vertical direction with respect to the receiving grooves 38 so that the lateral fixing bars 8a can be inserted into the receiving grooves 38 of the installed precast wall rail member 32 from above are received by the loop bars 36a. There is no reinforcing bar in the part that passes through the groove. Therefore, for reinforcement, the arrangement interval of the loop bars 36a having no upper portion in the bridge axis direction in the portion where the receiving groove 38 is formed is shorter than the arrangement interval of the loop bars 36a in the intermediate portion.
なお、プレキャスト壁高欄部材３２を下ろすときに、設置しようとするプレキャスト壁高欄部材３２の横方向定着筋８ａを、設置済みのプレキャスト壁高欄部材３２の受容溝３８に挿入することに代えて、設置しようとするプレキャスト壁高欄部材３２の受容溝３８に、設置済みのプレキャスト壁高欄部材３２の横方向定着筋８ａを挿入してもよい。この場合は、受容溝３８は、横方向定着筋８ａが通過できるように、下端部が下方に向かって開放されるように構成される。 In addition, when the precast wall rail member 32 is lowered, instead of inserting the lateral fixing bar 8a of the precast wall rail member 32 to be installed into the receiving groove 38 of the precast wall rail member 32 that has already been installed, You may insert the horizontal fixing bar | burr 8a of the installed precast wall rail member 32 in the receiving groove 38 of the precast wall rail member 32 to be installed. In this case, the receiving groove 38 is configured such that the lower end is opened downward so that the lateral fixing muscle 8a can pass therethrough.
図６（ｄ）に示すように、目地材６用及び受容溝３８の充填材１６用の型枠２１を設置し、第１実施形態と同様に目地材６及び充填材１６を注入する。 As shown in FIG. 6 (d), the mold 21 for the joint material 6 and the filler 16 of the receiving groove 38 is installed, and the joint material 6 and the filler 16 are injected as in the first embodiment.
この方法によれば、第１実施形態と同様に、プレキャスト壁高欄部材３２を床版３３に接合するために、従来工法で行われていたループ継手や、ＰＣ鋼材での連結、コンクリートの打設等を行う必要がなく、外部足場及び型枠２１の設置も簡略化できるため、施工現場での作業を大幅に削減でき、工期も短縮できる。互いに隣接するプレキャスト壁高欄部材３２同士の接合についても第１実施形態と同様に、施工現場での作業を削減できる。充填材１０の縦方向定着筋３６ｂへの付着の確実性が高い点も第１実施形態と同様である。 According to this method, in the same manner as in the first embodiment, in order to join the precast wall rail member 32 to the floor slab 33, the loop joint, the connection with the PC steel material, and the placement of the concrete performed by the conventional construction method are performed. The installation of the external scaffold and the formwork 21 can be simplified, so that the work on the construction site can be greatly reduced and the construction period can be shortened. As for the joining of the precast wall rail members 32 adjacent to each other, the work on the construction site can be reduced as in the first embodiment. Similar to the first embodiment, the certainty of the adhesion of the filler 10 to the longitudinal fixing stripes 36b is high.
第２実施形態は、床版３の厚さによって縦方向定着筋３６ｂの定着長さを確保できる場合に好適である。 The second embodiment is suitable for the case where the fixing length of the longitudinal fixing stripes 36b can be secured by the thickness of the floor slab 3.
第１実施形態に係るプレキャスト壁高欄の取付構造に対応する試験体について静的載荷試験を行った。 A static loading test was performed on the test body corresponding to the mounting structure of the precast wall rail according to the first embodiment.
第１試験体は、橋軸方向の長さが２．４ｍの試験体である。第１試験体に幅方向の内側から第１試験体が破壊するまで荷重を加えた。図８は、試験後の第１試験体の写真である（ａ：橋軸方向から見た写真、ｂ：幅方向内側から撮った写真、ｃ：幅方向外側から撮った写真）。終局荷重は、４２４ｋＮであり、設計荷重（１３８ｋＮ）の約３倍であった。また、破壊形式は、地覆部の曲げ引張破壊であった。 The first specimen is a specimen having a length in the bridge axis direction of 2.4 m. A load was applied to the first specimen from the inside in the width direction until the first specimen was broken. FIG. 8 is a photograph of the first specimen after the test (a: a photograph viewed from the bridge axis direction, b: a photograph taken from the inner side in the width direction, and c: a photograph taken from the outer side in the width direction). The ultimate load was 424 kN, which was about three times the design load (138 kN). The fracture type was bending tensile fracture of the ground cover.
第２試験体は、橋軸方向の長さが６．０ｍの試験体である。第２試験体の端部に対し、幅方向の内側から設計荷重（１３８ｋＮ）を３回載荷した。図９は、試験後の第２試験体の写真である（ａ：橋軸方向から見た写真、ｂ：幅方向内側から撮った写真、ｃ：幅方向外側から撮った写真）。端部に生じたひび割れの幅は、０．２ｍｍ以下であった。 The second specimen is a specimen having a length in the bridge axis direction of 6.0 m. A design load (138 kN) was loaded three times from the inner side in the width direction onto the end of the second specimen. FIG. 9 is a photograph of the second specimen after the test (a: a photograph viewed from the bridge axis direction, b: a photograph taken from the inner side in the width direction, and c: a photograph taken from the outer side in the width direction). The width of the crack generated at the end was 0.2 mm or less.
また、第２試験体の橋軸方向の目地部、すなわち２つのプレキャスト壁高欄部材間の目地部に幅方向の内側から第２試験体が破壊するまで荷重を加えた。図１０は、試験後の第２試験体の写真である（ａ：幅方向内側から撮った写真、ｂ：幅方向外側から撮った写真）。橋軸方向の目地部の一体性は、破壊に至るまで保持された。また、破壊形式は、プレキャスト壁高欄部材の本体部分の押しぬきせん断破壊であった。 Further, a load was applied to the joint portion in the bridge axis direction of the second test body, that is, the joint portion between the two precast wall rail members from the inner side in the width direction until the second test body was broken. FIG. 10 is a photograph of the second specimen after the test (a: photograph taken from the inside in the width direction, b: photograph taken from the outside in the width direction). The integrity of the joints in the direction of the bridge axis was maintained until destruction. Moreover, the fracture type was a push-through shear fracture of the main body portion of the precast wall rail member.
以上の試験によって、第１実施形態に係る取付構造に構成されたプレキャスト壁高欄は、車両用防護柵としての強度性能・変形性能に関する要求性能を満足していることが確認された。 From the above test, it was confirmed that the precast wall rail configured in the mounting structure according to the first embodiment satisfies the required performance related to the strength performance and deformation performance as the vehicle protective fence.
以上で具体的実施形態の説明を終えるが、本発明は上記実施形態に限定されることなく幅広く変形実施することができる。例えば、第１実施形態において受容溝の上端側は、充填材注入用のホースを挿入するために開放されているが、別途、挿入口を確保すれば、受容溝の上端側を閉じた形状としてもよい。また、受容孔は、１列としても３列以上としてもよい。各定着筋に設けられた機械式定着の定着具は、同一の形状であっても、異なる形状であってもよい。また、本発明は、橋梁の新設工事、床版の更新工事のいずれにも適用できる。プレキャスト壁高欄部材の、幅方向外側に下方に向かって延出して、床版又は地覆の側面に当接する突起を設けて、この突起を目地材の幅方向外側の型枠として使用してもよい。このような突起を設けることにより、型枠を設けるための外部足場が不要になる。 Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the first embodiment, the upper end side of the receiving groove is opened to insert a hose for filling material filling, but if the insertion port is secured separately, the upper end side of the receiving groove is closed. Also good. The receiving holes may be one row or three or more rows. The fixing devices for mechanical fixing provided on each fixing line may be the same shape or different shapes. Further, the present invention can be applied to both a new bridge construction work and a floor slab renewal construction work. Even if the precast wall rail member extends downward in the width direction and is provided with a protrusion that contacts the side surface of the floor slab or the ground cover, the protrusion may be used as a form frame on the outer side of the joint material. Good. By providing such a protrusion, an external scaffold for providing the formwork becomes unnecessary.
１，３１：壁高欄の取付構造
２，３２：プレキャスト壁高欄部材
３，３３：床版
４：地覆
６：目地材
７：縦方向鉄筋
７ａ：第１縦方向定着筋
７ｂ：第２縦方向定着筋
８：横方向鉄筋
８ａ：横方向定着筋
８ｂ：横方向筋
９：受容孔
１０：充填材（受容孔用）
１１：機械式定着の定着具
１５：受容溝
１６：充填材（受容溝用）
３６：縦方向鉄筋
３６ａ：ループ筋
３６ｂ：縦方向定着筋
３７：受容孔
３８：受容溝
DESCRIPTION OF SYMBOLS 1,31: Wall railing mounting structure 2, 32: Precast wall railing member 3, 33: Floor slab 4: Ground cover 6: Joint material 7: Longitudinal reinforcing bar 7a: 1st vertical fixing bar 7b: 2nd vertical direction Anchor muscle 8: transverse reinforcing bar 8a: transverse anchor muscle 8b: transverse muscle 9: receiving hole 10: filler (for receiving hole)
11: Fixing tool 15 for mechanical fixing 15: receiving groove 16: filler (for receiving groove)
36: Longitudinal reinforcing bar 36a: Loop bar 36b: Longitudinal fixing bar 37: Receiving hole 38: Receiving groove
Claims (8)
上下方向に延在して上方に開放された受容孔を有する、床版又は前記床版に設けられた地覆と、
コンクリート部分及び該コンクリート部分の下端から下方に突出する端部を有する縦方向定着筋を有し、前記床版又は前記地覆上に配置されたプレキャスト壁高欄部材とを備え、
前記縦方向定着筋の前記端部の下端に機械式定着の定着具が設けられ、前記縦方向定着筋の該端部が前記受容孔内に充填された第１充填材内に埋設されていることを特徴とする取付構造。 Precast wall railing mounting structure,
A floor slab or a ground cover provided in the floor slab having a receiving hole extending in the vertical direction and opened upward;
A precast wall railing member having a concrete part and a longitudinal fixing bar having an end projecting downward from a lower end of the concrete part, and disposed on the floor slab or the ground cover,
A fixing device for mechanical fixing is provided at a lower end of the end portion of the vertical fixing line, and the end portion of the vertical fixing line is embedded in a first filler filled in the receiving hole. A mounting structure characterized by that.
前記プレキャスト壁高欄部材の前記一方の端縁に隣接する他の前記プレキャスト壁高欄部材は、前記一方の端縁に対向する前記コンクリート部分の端縁から橋軸方向に突出する端部を有する横方向定着筋を有し、
前記横方向定着筋の前記端部の突出端に機械式定着の定着具が設けられ、前記横方向定着筋の前記端部が、前記受容溝内に充填された第２充填材内に埋設されていることを特徴とする請求項１に記載の取付構造。 A receiving groove extending in the vertical direction is provided at one edge in the bridge axis direction of the precast wall rail member,
The other precast wall rail member adjacent to the one edge of the precast wall rail member has an end portion protruding in the bridge axis direction from the edge of the concrete portion facing the one edge. Have anchor muscles,
A fixing device for mechanical fixing is provided at a protruding end of the end portion of the lateral fixing stripe, and the end portion of the lateral fixing stripe is embedded in a second filler filled in the receiving groove. The mounting structure according to claim 1, wherein:
床版又は該床版に設けられた地覆の上面から下方に向かって形成された受容孔に第１充填材を充填するステップと、
コンクリート部分の下端から下方に突出する端部を有する縦方向定着筋を有するプレキャスト壁高欄部材を、前記縦方向定着筋の該端部が前記第１充填材の充填された前記受容孔に受容されるように配置するステップとを備え、
前記縦方向定着筋の下方に突出した前記端部の端縁に機械式定着の定着具が形成されていることを特徴とするプレキャスト壁高欄の取付方法。 A mounting method for a precast wall rail,
Filling the first filling material into the receiving hole formed downward from the upper surface of the floor slab or the ground cover provided on the floor slab;
A precast wall rail member having a longitudinal fixing bar having an end projecting downward from a lower end of the concrete portion is received in the receiving hole filled with the first filler. And arranging the steps to
A fixing method for a precast wall rail, wherein a fixing device for mechanical fixing is formed on an edge of the end portion protruding downward from the vertical fixing bar.
前記配置するステップは、配置しようとする前記プレキャスト壁高欄部材を、該配置しようとする前記プレキャスト壁高欄部材の前記横方向定着筋の前記端部及び前記受容溝の一方を、配置済みの前記プレキャスト壁高欄部材の前記横方向定着筋の前記端部及び前記受容溝の他方に対して上下方向に整合させるように、該配置済みの前記プレキャスト壁高欄部材の上方に配置した後、下方に移動させることを含み、該移動を可能にするべく、前記プレキャスト壁高欄部材の前記受容溝は、上方又は下方の少なくとも一方が開放されており、
前記横方向定着筋の橋軸方向に突出した前記端部の端縁に機械式定着の定着具が形成されており、
当該取付方法は、前記配置するステップの後に、
前記床版又は前記地覆と前記プレキャスト壁高欄部材の前記コンクリート部分との間に、目地材を注入するステップと、
前記受容溝に第２充填材を充填するステップとを更に備えることを特徴とする請求項４に記載のプレキャスト壁高欄の取付方法。 The precast wall rail member has a receiving groove extending in a vertical direction at one end edge in the bridge axis direction, and an end portion protruding in the bridge axis direction from the concrete portion of the other end edge in the bridge axis direction. Direction anchoring muscles,
In the step of placing, the precast wall rail member to be placed is placed on one of the end portion of the lateral fixing bar and the receiving groove of the precast wall rail member to be placed. After arranging the precast wall rail member above the already-arranged precast wall rail member so as to be vertically aligned with the other end of the lateral fixing bar of the wall rail member and the other of the receiving groove, it is moved downward. In order to enable the movement, the receiving groove of the precast wall rail member is open at least one of the upper side and the lower side,
A fixing device for mechanical fixing is formed on an edge of the end portion protruding in the bridge axis direction of the lateral fixing muscle,
The attachment method is, after the placing step,
Injecting joint material between the floor slab or the ground cover and the concrete portion of the precast wall rail member;
The method according to claim 4, further comprising a step of filling the receiving groove with a second filler.
前記地覆は、工場で、プレキャストコンクリート部材からなる前記床版と一体化させるように製造されることを特徴とする請求項４〜７の何れか一項に記載のプレキャスト壁高欄の取付方法。 The receiving hole is provided in the ground cover;
The method for mounting a precast wall rail according to any one of claims 4 to 7, wherein the ground cover is manufactured at a factory so as to be integrated with the floor slab made of a precast concrete member.
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