JP2013194355A - Reinforcement structure and reinforcement method for existing pile - Google Patents
Reinforcement structure and reinforcement method for existing pile Download PDFInfo
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Abstract
Description
本発明は、既設杭の補強構造及び補強方法に関し、特に、既設の橋梁の上部構造（床版、床組等）を支持する杭の補強等に有効な既設杭の補強構造及び補強方法に関する。 The present invention relates to a reinforcing structure and a reinforcing method for an existing pile, and more particularly to a reinforcing structure and a reinforcing method for an existing pile that are effective for reinforcing a pile that supports an upper structure (floor slab, floor set, etc.) of an existing bridge.
老朽化した既設の橋梁の上部構造（床版、床組等）を支持する杭を補強する工法の一例が特許文献１、２に記載されている。 Patent Documents 1 and 2 describe an example of a method for reinforcing a pile that supports the superstructure (floor slab, floor assembly, etc.) of an existing bridge that has deteriorated.
特許文献１に記載の工法は、鋼管杭の腐食劣化部の上方及び下方の部分にそれぞれ上方リブ及び下方リブを溶接により一体に設け、下方リブより下方の鋼管杭の表面に鍔を溶接により一体に取り付け、鋼管杭よりも大径で、内面に凸部を設けた半割り鋼管を鋼管杭の水面より上方で溶接して、鋼管杭を囲む外套管を形成し、この外套管を下降させて下端を鍔上に載置させ、鋼管杭と外套管との間にモルタル又はコンクリートを充填して一体化することにより、鋼管杭を補強するように構成したものである。 In the construction method described in Patent Document 1, an upper rib and a lower rib are integrally provided by welding on the upper and lower portions of the corrosion-degraded portion of the steel pipe pile, respectively, and a flange is integrated on the surface of the steel pipe pile below the lower rib by welding. A half pipe with a larger diameter than the steel pipe pile and a convex part on the inner surface is welded above the water surface of the steel pipe pile to form an outer pipe surrounding the steel pipe pile, and this outer pipe is lowered. The lower end is placed on the ridge, and the steel pipe pile is reinforced by filling and integrating mortar or concrete between the steel pipe pile and the outer tube.
また、特許文献２に記載の工法は、橋脚の外面に分割鋼板部材をあてがい、分割鋼板部材の継手部を溶接することで鋼板ブロックを組み立て、この鋼板ブロックを橋脚の上部に設置した圧入装置により押し下げて地中に圧入し、この鋼板ブロックの組み立て作業と、組み立てた鋼板ブロックの圧入作業とを、複数の鋼板ブロックを溶接によって連結しながら繰り返し行うことにより橋脚の外面を複数の鋼板ブロックによって被覆し、この後に、複数の鋼板ブロックと橋脚との間にモルタルを充填して一体化することにより、橋脚を補強するように構成したものである。 In addition, the construction method described in Patent Document 2 applies a divided steel plate member to the outer surface of the pier, assembles a steel plate block by welding a joint portion of the divided steel plate member, and uses a press-fitting device installed on the upper portion of the pier. Press down and press-fit into the ground, and repeat the assembly work of this steel plate block and the press-fitting work of the assembled steel plate block while connecting multiple steel plate blocks by welding, thereby covering the outer surface of the pier with multiple steel plate blocks Then, the pier is reinforced by filling and integrating mortar between the plurality of steel plate blocks and the pier.
ところで、上記のような工法にあっては、上方リブ、下方リブ、鍔、及び半割り鋼管の溶接作業、分割鋼板部材の溶接作業を現場で行う必要があるため、補強対象の鋼管杭、橋脚が、河川、湖、港湾等のように水中にある場合には、溶接を行うために鋼管杭、橋脚の周囲を囲むように仮締切工を設置し、仮締切工の内側を排水してドライ環境をつくり、このドライ環境下で溶接作業を行う必要がある。また、半割り鋼管、及び分割鋼板部材は、補強対象の鋼管杭、橋脚を補強する構造部材としての強度が要求されるため、半割り鋼管の端面間、分割鋼板部材の端面間を全溶接によって強固に接合する必要がある。 By the way, in the above construction method, it is necessary to perform welding work of the upper rib, the lower rib, the flange, and the half-cut steel pipe and the weld work of the divided steel plate member on the site. However, if it is underwater, such as in a river, lake, or harbor, a temporary closing work will be installed to surround the steel pipe pile and pier for welding, and the inside of the temporary closing work will be drained and dried. It is necessary to create an environment and perform welding work in this dry environment. Moreover, since the strength of steel pipe piles and split steel plate members that are to be reinforced is required as a structural member that reinforces the steel pipe piles and piers, the welds between the end faces of the half steel pipes and between the end faces of the split steel plate members are completely welded. It is necessary to join firmly.
このため、仮締切工の設置作業、及び溶接作業に時間と手間がかかり、既設杭の補強に要する費用が高くなる。 For this reason, time and labor are required for the installation work and the welding work of the temporary closing work, and the cost required for reinforcing the existing piles becomes high.
本発明は、上記のような従来の問題に鑑みなされたものであって、既設杭の補強に要する手間、時間を大幅に削減することができ、これにより、既設杭の補強工事に要する費用を大幅に削減することができる既設杭の補強構造及び補強方法を提供することを目的とする。 The present invention has been made in view of the conventional problems as described above, and can greatly reduce the labor and time required to reinforce existing piles, thereby reducing the cost for reinforcing existing piles. It aims at providing the reinforcement structure and reinforcement method of the existing pile which can be reduced significantly.
本発明は、上記のような課題を解決するために、以下のような手段を採用している。
すなわち、本発明は、既設の構造物を支持する既設杭の補強構造であって、前記杭の周囲を囲むように設置される型枠と、該型枠と前記杭との間に充填された、繊維補強コンクリートとからなることを特徴とする。
The present invention employs the following means in order to solve the above problems.
That is, this invention is the reinforcement structure of the existing pile which supports the existing structure, Comprising: It filled between the formwork installed so that the circumference | surroundings of the said pile may be enclosed, and this formwork and the said pile It consists of fiber-reinforced concrete.
本発明の既設杭の補強構造によれば、型枠と杭との間に繊維補強コンクリートを充填することにより、既設杭を補強することができる。
この場合、型枠は、型枠としての機能を有していればよく、型枠に既設杭を補強する構造部材としての強度を持たせる必要はないので、型枠の設置に要する手間、時間を大幅に削減することができ、既設杭の補強に要する費用を大幅に削減することができる。
According to the reinforcement structure of the existing pile of this invention, an existing pile can be reinforced by filling a fiber reinforced concrete between a formwork and a pile.
In this case, the formwork only needs to have a function as a formwork, and it is not necessary to give the formwork strength as a structural member for reinforcing an existing pile. Can be significantly reduced, and the cost required to reinforce existing piles can be greatly reduced.
また、本発明において、前記型枠は、周方向の少なくとも１箇所において軸方向に分断されるとともに、分断部分の端面間を接合することにより筒状に形成された型枠部材を備えていることとしてもよい。 Further, in the present invention, the mold frame is divided in the axial direction at at least one place in the circumferential direction, and includes a mold member formed in a cylindrical shape by joining the end faces of the divided portions. It is good.
本発明の既設杭の補強構造によれば、分断部分の端面間を接合することにより、筒状の型枠部材を構成することができ、この型枠部材を軸方向に複数連結することにより、既設杭の所定の範囲を囲む型枠を構成することができる。 According to the reinforcement structure of the existing pile of the present invention, by joining between the end faces of the divided portion, it is possible to configure a cylindrical formwork member, by connecting a plurality of this formwork member in the axial direction, A formwork surrounding a predetermined range of the existing pile can be configured.
また、本発明において、前記型枠部材は、嵌合、ねじ止め、又は点溶接による接合手段によって分断部分の端面間が接合されていることとしてもよい。 In the present invention, the mold member may be joined between the end faces of the divided portion by joining means by fitting, screwing, or spot welding.
本発明の既設杭の補強構造によれば、型枠を構成する場合に、型枠部材の分断部分の端面間を、嵌合、ねじ止め、点溶接等の簡易な接合手段によって接合すればよいので、水中でも水上でも、型枠部材の分断部分の端面間を接合することができ、型枠の設置に要する時間、手間を大幅に削減することができる。 According to the reinforcement structure of an existing pile of the present invention, when forming a formwork, the end surfaces of the divided portions of the formwork member may be joined by simple joining means such as fitting, screwing, spot welding, and the like. Therefore, the end surfaces of the divided portions of the formwork member can be joined both in water and on the water, and the time and labor required for installing the formwork can be greatly reduced.
さらに、本発明の既設杭の補強方法は、既設の構造物を支持する既設杭の補強方法であって、前記杭の周囲を囲むように、周方向の少なくとも1箇所において軸方向に分断された筒状の型枠部材を配置して、該型枠部材の分断部分の端面間を接合し、該型枠部材を地盤中に所定の深さまで圧入し、この型枠部材の分断部分の端面間の接合作業と型枠部材の圧入作業とを、複数の筒状の型枠部材を軸方向に連結しながら繰り返し行うことにより、前記杭の所定範囲を覆う型枠を設置し、この型枠と前記杭との間に繊維補強コンクリートを充填することを特徴とする。 Furthermore, the method for reinforcing an existing pile according to the present invention is a method for reinforcing an existing pile that supports an existing structure, and is divided in the axial direction at at least one circumferential direction so as to surround the periphery of the pile. A cylindrical formwork member is arranged, the end faces of the divided portions of the formwork member are joined, and the formwork member is press-fitted into the ground to a predetermined depth, between the end faces of the divided portions of the formwork member. By repeating the joining work and the press-fitting work of the formwork member while connecting a plurality of cylindrical formwork members in the axial direction, a formwork that covers a predetermined range of the pile is installed, and this formwork A fiber-reinforced concrete is filled between the piles.
以上、説明したように、本発明の既設杭の補強構造及び補強方法によれば、既設杭の補強に要する手間及び時間を削減することができ、既設杭の補強に要する費用を削減することができる。 As described above, according to the reinforcing structure and reinforcing method of an existing pile according to the present invention, it is possible to reduce the labor and time required for reinforcing the existing pile, and to reduce the cost required for reinforcing the existing pile. it can.
以下、図面を参照しながら本発明の実施の形態について説明する。
図１〜図４には、本発明による既設杭の補強構造の一実施の形態が示され、図５〜図９には、補強構造の施工手順が示されている。本実施の形態の既設杭の補強構造は、河川や海等の水上を跨いだ状態に設置されている既設の橋梁の上部構造（床版、床組等）を支持する杭の補強に適用したものであって、車両等の通行を許容した状態で施工できるように構成したものである。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of a reinforcing structure of an existing pile according to the present invention, and FIGS. 5 to 9 show a construction procedure of the reinforcing structure. The existing pile reinforcement structure of the present embodiment is applied to the reinforcement of piles that support the upper structure (floor slab, floor assembly, etc.) of an existing bridge installed in a state straddling the water such as a river or the sea. The construction is such that the construction can be performed in a state where the passage of the vehicle or the like is permitted.
既設の橋梁３０は、図１に示すように、例えば、車両等を支持する床版３２、床版３２を支持する床組３５（上層梁３６）等からなる上部構造３１と、下層梁４０等からなる下部構造３８と、車両等、上部構造３１、及び下部構造３８からの荷重を地盤４２に伝達させる杭４１とから構成されている。
なお、本実施の形態においては、河川や海等の水上を跨いだ状態に設置されている既設の道路橋梁を対象としているが、これに限定することなく、陸上に設置されている橋梁の杭を対象としてもよい。また、橋梁の杭に限らず、各種の構造物を支持する杭を対象としてもよい。
As shown in FIG. 1, the existing bridge 30 includes, for example, a floor slab 32 that supports a vehicle and the like, an upper structure 31 that includes a floor set 35 (upper layer beam 36) that supports the floor slab 32, a lower layer beam 40, and the like. And a pile 41 for transmitting a load from the upper structure 31 such as a vehicle and the lower structure 38 to the ground 42.
In this embodiment, the target is an existing road bridge that is installed across the water such as a river or the sea. However, the present invention is not limited to this, and the pile of the bridge installed on land is not limited to this. May be targeted. Moreover, it is good also not only for the pile of a bridge but the pile which supports various structures.
本実施の形態の既設杭の補強構造１は、杭４１の周囲を囲むように設けられる型枠２と、型枠２と杭４１との間に形成される隙間１９内に充填される繊維補強コンクリート２０とから構成されている。
なお、本実施の形態においては、鋼製の型枠２を使用している。
The existing pile reinforcing structure 1 of the present embodiment is a fiber reinforcement filled in a mold frame 2 provided so as to surround the pile 41 and a gap 19 formed between the mold frame 2 and the pile 41. It is composed of concrete 20.
In the present embodiment, a steel mold 2 is used.
型枠２は、図１〜図４に示すように、一対の半管４、４（本実施の形態では、鋼製の一対の半管４、４）を接合して構成した管状の型枠部材３を、軸方向に複数一連に連結して構成したものであって、杭４１の頭部に設置した圧入装置２１によって地盤４２中に所定の深さまで圧入することにより、杭４１の所定の範囲を覆うように構成したものである。 As shown in FIGS. 1 to 4, the mold 2 is a tubular mold formed by joining a pair of half tubes 4 and 4 (in this embodiment, a pair of steel half tubes 4 and 4). A plurality of members 3 are connected in series in the axial direction, and are pressed into the ground 42 to a predetermined depth by a press-fitting device 21 installed at the head of the pile 41, whereby a predetermined pile 41 It is configured to cover the range.
型枠２は、杭４１を補強する構造部材としての強度を有する必要はなく、地盤４２への圧入に耐えられ、かつ、隙間１９内に充填する繊維補強コンクリート２０の圧力に耐えられる強度を有すればよい。 The formwork 2 does not need to have strength as a structural member for reinforcing the pile 41, can withstand press-fitting into the ground 42, and has strength to withstand the pressure of the fiber-reinforced concrete 20 filling the gap 19. do it.
型枠２は、上記のような条件を満たすものであれば、鋼製に限らず、木製、合成樹脂製等とすることもできる。 The mold 2 is not limited to steel but can be made of wood, synthetic resin, or the like as long as the above conditions are satisfied.
型枠部材３を構成するには、横方向接合手段５ａにより、一対の半管４の周方向の端面間を一体に接合する。また、複数の型枠部材３を軸方向に一連に連結するには、縦方向接合手段５ｂにより、２つの型枠部材３、３の軸方向の端面間を一体に接合する。 In order to constitute the mold member 3, the end faces in the circumferential direction of the pair of half tubes 4 are integrally joined by the lateral joining means 5a. Further, in order to connect a plurality of mold members 3 in series in the axial direction, the axial end surfaces of the two mold members 3, 3 are integrally joined by the longitudinal joining means 5b.
図２〜図４に横方向接合手段５ａ、及び縦方向接合手段５ｂの例を示す。
図２に示す横方向接合手段５ａは、半管４の周方向の一端の裏面側に突出した状態に設けられる１又は複数（本実施の形態では２つ）の横裏当て板６、６と、各横裏当て板６の中央部にそれぞれ設けられるねじ孔７と、半管４の周方向の他端の各横裏当て板６のねじ孔７に対応する部分にそれぞれ設けられる孔８とから構成されている。また、縦方向接合手段５ａは、半管４の軸方向の一端の裏面側に突出した状態に設けられる１又は複数（本実施の形態では２つ）の縦裏当て板１０、１０と、各縦裏当て板１０の中央部にそれぞれ設けられるねじ孔１１と、半管４の軸方向の他端の各縦裏当て板１０のねじ孔１１に対応する部分にそれぞれ設けられる孔１２とから構成されている。
2 to 4 show examples of the transverse joining means 5a and the longitudinal joining means 5b.
The lateral joining means 5a shown in FIG. 2 includes one or a plurality of (two in the present embodiment) lateral backing plates 6 and 6 provided in a state of projecting to the back side of one end in the circumferential direction of the half tube 4. A screw hole 7 provided in the center of each lateral backing plate 6, and a hole 8 provided in a portion corresponding to the screw hole 7 of each lateral backing plate 6 at the other end in the circumferential direction of the semi-tube 4. It is composed of The longitudinal joining means 5a includes one or more (two in the present embodiment) longitudinal backing plates 10 and 10 provided in a state of projecting to the back side of one end of the half tube 4 in the axial direction, A screw hole 11 provided at the center of the vertical backing plate 10 and a hole 12 provided at a portion corresponding to the screw hole 11 of each vertical backing plate 10 at the other axial end of the half tube 4. Has been.
そして、両半管４、４を、横裏当て板６、６が設けられた一端と、孔８、８が設けられた他端とを、一方の半管４の一端の横裏当て板６が他方の半管４の他端の裏面に接触し、他方の半管４の一端の横裏当て板６が一方の半管４の他端の裏面に接触するように、組み合わせ、各孔８と各ねじ孔７との間に半管４の外側からねじ１３を挿通させて締め付けることにより、両半管４、４の周方向の端面間を一体に接合することができ、管状の型枠部材３を構成することができる。 Then, both the semi-tubes 4 and 4 are connected to one end provided with the lateral backing plates 6 and 6 and the other end provided with the holes 8 and 8 to the horizontal backing plate 6 at one end of the half tube 4. Are connected to each other so that the side backing plate 6 at one end of the other half tube 4 contacts the back surface at the other end of the other half tube 4. By inserting screws 13 from the outside of the semi-tube 4 between the screw holes 7 and tightening them, the end faces in the circumferential direction of both the semi-tubes 4 and 4 can be joined together, and the tubular formwork The member 3 can be configured.
また、２つの型枠部材３、３を、縦裏当て板１０が設けられた一端と、孔１２が設けられた他端とを、一方の型枠部材３の一端の縦裏当て板１０が他方の型枠部材３の他端の裏面に接触するように、組み合わせ、各孔１２と各ねじ孔１１との間に型枠部材３、３の外側からねじ１３を挿通させて締め付けることにより、２つの型枠部材３、３の軸方向の端面間を一体に接合することができる。 Further, the two mold members 3 and 3 are connected to one end provided with the vertical backing plate 10 and the other end provided with the hole 12, and the vertical backing plate 10 at one end of the one mold member 3 is provided. In combination so as to contact the back surface of the other end of the other mold member 3, the screws 13 are inserted between the holes 12 and the screw holes 11 from the outside of the mold members 3 and 3 and tightened. The end surfaces in the axial direction of the two mold members 3 and 3 can be joined together.
図３に示す横方向接合手段５ａは、半管４、４の周方向の一端の中央部に突出した状態に設けられる、先端側ほど長さが大きくなる台形状の横嵌合突起１５と、半管４の周方向の他端の中央部に凹んだ状態に設けられる、先端側ほど長さが大きくなる台形状の横嵌合溝１６とから構成されている。また、縦方向接合手段５ｂは、半管４の長さ方向の一端に突出した状態に設けられる、先端側ほど長さが大きくなる台形状の縦嵌合突起１７と、半管４の長さ方向の他端に設けられる、先端側ほど長さが大きくなる台形状の縦嵌合溝１８とから構成されている。型枠部材３は、剛性が低い材料から形成されているため、横嵌合溝１６、縦嵌合溝１８を弾性的に外側に変形させて、横嵌合溝１６、縦嵌合溝１８内に横嵌合突起１５、縦嵌合突起１７を容易に嵌合させることができる。 The lateral joint means 5a shown in FIG. 3 is provided in a state of projecting to the central portion of one end in the circumferential direction of the semi-tubes 4, 4, and a trapezoidal lateral fitting protrusion 15 having a length that increases toward the tip side, The semi-tube 4 includes a trapezoidal lateral fitting groove 16 which is provided in a recessed state at the center of the other end in the circumferential direction and has a length that increases toward the distal end side. Further, the longitudinal joining means 5b is provided in a state of projecting at one end in the length direction of the half tube 4 and has a trapezoidal vertical fitting protrusion 17 whose length increases toward the tip side, and the length of the half tube 4 It is comprised from the trapezoidal vertical fitting groove 18 provided in the other end of a direction, and length becomes large at the front end side. Since the formwork member 3 is formed of a material having low rigidity, the lateral fitting groove 16 and the vertical fitting groove 18 are elastically deformed outward so that the horizontal fitting groove 16 and the vertical fitting groove 18 are inside. The horizontal fitting protrusion 15 and the vertical fitting protrusion 17 can be easily fitted to each other.
そして、両半管４、４を、横嵌合突起１５が設けられた一端と、横嵌合溝１６が設けられた他端とを、一方の半管４の一端の横嵌合突起１５と他方の半管４の他端の横嵌合溝１６とが互いに嵌合するように、組み合わせることにより、両半管４、４の周方向の端面間を一体に接合することができ、管状の型枠部材３を構成することができる。 Then, both the half pipes 4 and 4 are connected to one end provided with the horizontal fitting protrusion 15 and the other end provided with the horizontal fitting groove 16, and to the horizontal fitting protrusion 15 at one end of the one half pipe 4. By combining the other half pipes 4 so that the other side horizontal fitting grooves 16 are fitted to each other, the end faces in the circumferential direction of both the half pipes 4 and 4 can be integrally joined. The formwork member 3 can be configured.
また、２つの型枠部材３、３を、縦嵌合突起１７が設けられた一端と、縦嵌合溝１８が設けられた他端とを、一方の型枠部材３の一端の縦嵌合突起１７と他方の型枠部材３の縦嵌合溝１８とが互いに嵌合するように、組み合わせることにより、２つの型枠部材３、３の軸方向の端面間を一体に接合することができる。 Also, the two mold members 3 and 3 are vertically fitted to one end of the one mold member 3 with one end provided with the vertical fitting protrusion 17 and the other end provided with the vertical fitting groove 18. By combining the projection 17 and the vertical fitting groove 18 of the other mold member 3 so as to fit each other, the axial end surfaces of the two mold members 3 and 3 can be joined together. .
図４に示す横方向接合手段５ａは、点溶接１４ａであって、両半管４、４の周方向の端面同士を互いに接触させ、両半管４、４の端面間の複数箇所を点溶接１４ａによって一体に接合することにより、両半管４、４の周方向の端面間を一体に接合することができる。また、縦方向接合手段５ｂも点溶接１４ｂであって、２つの型枠部材３、３の軸方向の端面同士を互いに接触させ、両型枠部材３、３の軸方向の端面間を点溶接１４ｂによって一体に接合することにより、２つの型枠部材３、３の軸方向の端面間を一体に接合することができる。 The transverse direction joining means 5a shown in FIG. 4 is a spot weld 14a, in which end faces in the circumferential direction of both half tubes 4, 4 are brought into contact with each other, and a plurality of points between the end faces of both half tubes 4, 4 are spot welded. By joining together by 14a, the end surfaces of the circumferential direction of both the semi-tubes 4 and 4 can be joined together. Further, the longitudinal joining means 5b is also a spot weld 14b, in which the axial end surfaces of the two mold members 3, 3 are brought into contact with each other, and the axial end surfaces of the two mold members 3, 3 are spot welded. By joining together by 14b, the axial end surfaces of the two mold members 3, 3 can be joined together.
なお、一対の半管４、４の周方向の端面間を接合する横方向接合手段５ａ、及び２つの型枠部材３、３の軸方向の端面間を接合する縦方向接合手段５ｂとしては、図２〜図４に示すものに限らず、両半管４、４の周方向の端面間、及び２つの型枠部材３、３の軸方向の端面間を一体に接合できるものであればよい。 In addition, as the horizontal direction joining means 5a for joining between the end faces in the circumferential direction of the pair of half tubes 4, 4, and the longitudinal direction joining means 5b for joining between the end faces in the axial direction of the two mold members 3, 3, It is not limited to those shown in FIG. 2 to FIG. 4, as long as it can integrally join between the end faces in the circumferential direction of the half tubes 4, 4 and between the end faces in the axial direction of the two mold members 3, 3. .
型枠２と杭４１との間の隙間１９内に充填される繊維補強コンクリート２０としては、所定の圧縮強度及び引張強度を発現できるものであれば特に制限はなく、例えば、本件出願人が先に出願した、特開２０１１−４２５３４号公報に記載の高靭性、高強度モルタル組成物を用いることができる。 The fiber reinforced concrete 20 filled in the gap 19 between the formwork 2 and the pile 41 is not particularly limited as long as it can express a predetermined compressive strength and tensile strength. The high toughness and high-strength mortar composition described in Japanese Patent Application Laid-Open No. 2011-42534 can be used.
この高靭性、高強度モルタル組成物は、セメントと、シリカフュームと、水と、減衰剤と、細骨材と、高張力繊維とを含み、セメントはＣ３Ｓを４０．０〜７５．０質量％、及びＣ３Ａを２．７質量％未満含有し、かつ、４５μｍふるい残分が８．０質量％未満であり、細骨材は、粒径０．１５ｍｍ以下の粒群を１５〜８５質量％、かつ、０．０７５ｍｍ以下の粒群を３〜２０質量％含有するものである。 The high toughness and high strength mortar composition includes cement, silica fume, water, attenuating agent, fine aggregate, and high tensile fiber, and the cement contains 40.0 to 75.0 mass of C 3 S. %, And less than 2.7% by mass of C 3 A, and 45 μm sieve residue is less than 8.0% by mass, and the fine aggregate is 15 to 85 particles having a particle size of 0.15 mm or less. It contains 3 to 20% by mass of a grain group having a mass% of 0.075 mm or less.
この高靭性、高強度モルタル組成物を繊維補強コンクリートとして用いることにより、早期に高い靭性、高い圧縮強度、及び高い引張強度を発現することができ、杭４１を補強する構造部材として機能させることができる。 By using this high toughness and high strength mortar composition as fiber reinforced concrete, high toughness, high compressive strength, and high tensile strength can be expressed at an early stage, and the pile 41 can be functioned as a structural member. it can.
次に、図５〜図９を参照しながら、本発明の補強構造１の施工方法について説明する。
まず、図５に示すように、補強対象の杭４１の頭部に圧力装置２１を設置し、圧力装置２１のプランジャ２２の下方の杭４１の部分を両側から挟むように一対の半管４、４を配置し、両半管４、４の周方向の端面間を互いに接触させて、図１〜図３に示す横方向接合手段５ａによって一体にすることにより、杭４１の周囲を囲むように第１の型枠部材３ａを配置する。そして、プランジャ２２を下降させて、第１の型枠部材３ａを下方に押圧することにより、図６に示すように、第１の型枠部材３ａを地盤４２中に所定の深さまで圧入する。
Next, the construction method of the reinforcing structure 1 of the present invention will be described with reference to FIGS.
First, as shown in FIG. 5, the pressure device 21 is installed on the head of the pile 41 to be reinforced, and the pair of half tubes 4 so as to sandwich the portion of the pile 41 below the plunger 22 of the pressure device 21 from both sides. 4 is arranged so that the end faces in the circumferential direction of both the semi-tubes 4 and 4 are brought into contact with each other and integrated by the lateral joining means 5a shown in FIGS. The first mold member 3a is disposed. Then, the plunger 22 is lowered and the first mold member 3a is pressed downward to press-fit the first mold member 3a into the ground 42 to a predetermined depth as shown in FIG.
次に、図７に示すように、プランジャ２２を元の位置まで上昇させて、プランジャ２２の下方の杭４１の部分に上記と同様にして、杭４１の周囲を囲むように第２の型枠部材３ｂを配置する。そして、第１の型枠部材３ａの軸方向の端面と第２型枠部材３ｂの軸方向の端面とを互いに接触させ、両型枠部材３ａ、３ｂの軸方向の端面間を図１〜図３に示す縦方向接合手段５ａによって一体に接合することにより、第１の型枠部材３ａと第２の型枠部材３ｂの軸方向の端面間を一体に接合する。そして、そして、プランジャ２２を下降させることにより、第１の型枠部材３ａ及び第２の型枠部材３ｂを下方に押圧して、第１の型枠部材３ａ及び第２の型枠部材３ｂを地盤４１中の所定の深さまで圧入する。 Next, as shown in FIG. 7, the plunger 22 is raised to its original position, and the second formwork is formed so as to surround the periphery of the pile 41 in the same manner as described above in the portion of the pile 41 below the plunger 22. The member 3b is disposed. Then, the axial end surface of the first mold member 3a and the axial end surface of the second mold member 3b are brought into contact with each other, and the space between the axial end surfaces of both mold members 3a, 3b is shown in FIGS. By joining together by the longitudinal joining means 5a shown in FIG. 3, the axial end surfaces of the first mold member 3a and the second mold member 3b are joined together. Then, by lowering the plunger 22, the first mold member 3a and the second mold member 3b are pressed downward, and the first mold member 3a and the second mold member 3b are pressed. Press-fit to a predetermined depth in the ground 41.
そして、このような作業を複数の型枠部材３に対して繰り返し行うことにより、杭４１の所定の範囲の周囲を囲むように、複数の型枠部材３を軸方向に一連に連結して構成した管状の型枠２を配置する。 And it repeats and performs such an operation | work with respect to the several formwork member 3, and connects the several formwork member 3 to an axial direction in series so that the circumference | surroundings of the predetermined range of the pile 41 may be enclosed. The tubular formwork 2 made is arranged.
次に、図８に示すように、型枠２と杭４１との間の隙間１９内を洗浄して水等を排除し、この後に、図９に示すように、隙間１９内に繊維補強コンクリート２０を充填して一体化することより、杭４１の周囲に繊維補強コンクリート２０を巻き立てた補強構造１を構築する。そして、このような作業を各杭４１に対して繰り返し行うことにより、橋梁３０の各杭４１を補強する補強構造１を構築することができる。 Next, as shown in FIG. 8, the inside of the gap 19 between the formwork 2 and the pile 41 is washed to remove water and the like, and then, as shown in FIG. By filling 20 and integrating, the reinforcing structure 1 in which the fiber reinforced concrete 20 is wound around the pile 41 is constructed. And the reinforcement structure 1 which reinforces each pile 41 of the bridge 30 can be constructed | assembled by repeating such an operation | work with respect to each pile 41. FIG.
上記のように構成した本実施の形態の杭の補強構造及び補強方法にあっては、型枠２は、構造部材としての強度を有する必要はなく、地盤４２への圧入に耐え得る強度、及び繊維補強コンクリート２０の圧力に耐え得る強度を有すればよいので、半管４の厚さを薄くできるとともに、半管４、４の周方向の端面間、及び２つの型枠部材３、３の軸方向の端面間を全溶接によって強固に接合する必要はなくなる。 In the reinforcing structure and method of a pile according to the present embodiment configured as described above, the formwork 2 does not need to have strength as a structural member, and can withstand press-fitting into the ground 42, and Since it is only necessary to have a strength capable of withstanding the pressure of the fiber reinforced concrete 20, the thickness of the half pipe 4 can be reduced, and between the end faces in the circumferential direction of the half pipes 4, 4 and between the two mold members 3, 3. There is no need to firmly join the end faces in the axial direction by full welding.
したがって、杭４１の周囲を囲むように仮締切工を設置してドライ環境を作る必要はなく、ねじ１３の締め付け、嵌合突起１５、１７の嵌合溝１６、１８への嵌合作業等の簡易な作業で十分に足りるので、水中でも、水上でもこれらの作業を行うことが可能となり、杭４１の補強に要する手間、時間を大幅に削減することができ、杭４１の補強に要する費用を大幅に削減することができる。 Therefore, there is no need to install a temporary cut-off work around the pile 41 to create a dry environment, such as tightening the screw 13 and fitting work of the fitting protrusions 15 and 17 into the fitting grooves 16 and 18. Since simple operations are sufficient, it is possible to perform these operations both in water and on the water, the labor and time required to reinforce the pile 41 can be greatly reduced, and the cost required to reinforce the pile 41 can be reduced. It can be greatly reduced.
なお、上記の説明においては、本発明による杭の補強構造及び補強方法を橋梁３０の上部構造３１を支持する杭４１の補強に適用したが、これに限らず各種の構造物を支持する杭の補強に適用してもよい。 In the above description, the pile reinforcement structure and method according to the present invention are applied to the reinforcement of the pile 41 that supports the upper structure 31 of the bridge 30. It may be applied to reinforcement.
また、上記の説明においては、一対の半管４、４によって円筒状の型枠部材３を構成したが、円筒状のものの１箇所又は３箇所以上を軸方向に分断したものを用い、分断部分の端面間を接合することにより円筒状の型枠部材３を構成してもよい。また、円筒状に限らず多角形筒状に形成したものを型枠部材３として用いてもよい。 Moreover, in said description, although the cylindrical formwork member 3 was comprised by the pair of semi-tubes 4 and 4, the part which divided | segmented the one or three or more places of the cylindrical thing to the axial direction was used, and a part to be divided The cylindrical formwork member 3 may be configured by joining the end faces of the two. Further, not only the cylindrical shape but also a polygonal cylindrical shape may be used as the mold member 3.
１ 補強構造
２ 型枠
３ 型枠部材
３ａ 第１の型枠部材
３ｂ 第２の型枠部材
４ 半管
５ａ 横方向接合手段
５ｂ 縦方向接合手段
６ 横裏当て板
７ ねじ孔
８ 孔
１０ 縦裏当て板
１１ ねじ孔
１２ 孔
１３ ねじ
１４ａ、１４ｂ 点溶接
１５ 横嵌合突起
１６ 横嵌合溝
１７ 縦嵌合突起
１８ 縦嵌合溝
１９ 隙間
２０ 繊維補強コンクリート
２１ 圧入装置
２２ プランジャ
３０ 橋梁
３１ 上部構造
３２ 床版
３５ 床組
３６ 上層梁
３８ 下部構造
４０ 下層梁
４１ 杭
４２ 地盤
DESCRIPTION OF SYMBOLS 1 Reinforcement structure 2 Formwork 3 Formwork member 3a 1st formwork member 3b 2nd formwork member 4 Half pipe 5a Lateral joining means 5b Vertical joining means 6 Horizontal backing plate 7 Screw hole 8 Hole 10 Vertical back Contact plate 11 Screw hole 12 Hole 13 Screw 14a, 14b Spot welding 15 Lateral fitting projection 16 Lateral fitting groove 17 Vertical fitting projection 18 Vertical fitting groove 19 Gap 20 Fiber reinforced concrete 21 Press fitting device 22 Plunger 30 Bridge 31 Upper structure 32 Floor slab 35 Floor set 36 Upper beam 38 Lower structure 40 Lower beam 41 Pile 42 Ground
Claims (4)
前記杭の周囲を囲むように設置される型枠と、該型枠と前記杭との間に充填された、繊維補強コンクリートとからなることを特徴とする既設杭の補強構造。 It is a reinforcement structure of an existing pile that supports an existing structure,
A reinforcing structure for an existing pile, comprising: a mold frame that is installed so as to surround the periphery of the pile, and fiber-reinforced concrete that is filled between the mold frame and the pile.
前記杭の周囲を囲むように、周方向の少なくとも1箇所において軸方向に分断された筒状の型枠部材を配置して、該型枠部材の分断部分の端面間を接合し、該型枠部材を地盤中に所定の深さまで圧入し、この型枠部材の分断部分の端面間の接合作業と型枠部材の圧入作業とを、複数の筒状の型枠部材を軸方向に連結しながら繰り返し行うことにより、前記杭の所定範囲を覆う型枠を設置し、この型枠と前記杭との間に繊維補強コンクリートを充填することを特徴とする既設杭の補強方法。 A method of reinforcing an existing pile that supports an existing structure,
A cylindrical formwork member divided in the axial direction at at least one place in the circumferential direction is disposed so as to surround the periphery of the pile, and the end faces of the divided portions of the formwork member are joined together, and the formwork The members are press-fitted into the ground to a predetermined depth, and the joining work between the end faces of the divided portions of the formwork member and the press-fit work of the formwork member are connected while connecting a plurality of tubular formwork members in the axial direction. A method for reinforcing an existing pile, characterized in that a mold frame covering a predetermined range of the pile is installed by repeating, and fiber reinforced concrete is filled between the mold frame and the pile.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112195954A (en) * | 2020-09-08 | 2021-01-08 | 王生东 | Reinforcing pile for wetland soft soil construction and installation method |
| CN113898373A (en) * | 2021-10-19 | 2022-01-07 | 辽宁工业大学 | FRP-PVC membrane shell filled with self-compacting coal gangue concrete fireproof combined coal pillar and reinforcing method |
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| JP2000336946A (en) * | 1999-05-26 | 2000-12-05 | Shiraishi Corp | Reinforcing method for columnar structure |
| JP2005152989A (en) * | 2003-11-28 | 2005-06-16 | Nippon Yakin Kogyo Co Ltd | Method of welding metal sheet |
| JP2009150166A (en) * | 2007-12-21 | 2009-07-09 | Nippon Concrete Ind Co Ltd | Concrete composite product |
| JP2011226569A (en) * | 2010-04-20 | 2011-11-10 | F Tech:Kk | Fitting member |
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| CN112195954A (en) * | 2020-09-08 | 2021-01-08 | 王生东 | Reinforcing pile for wetland soft soil construction and installation method |
| CN112195954B (en) * | 2020-09-08 | 2021-12-10 | 上海民航新时代机场设计研究院有限公司 | Reinforcing pile for wetland soft soil construction and installation method |
| CN113898373A (en) * | 2021-10-19 | 2022-01-07 | 辽宁工业大学 | FRP-PVC membrane shell filled with self-compacting coal gangue concrete fireproof combined coal pillar and reinforcing method |
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