JP4547717B2 - Concrete structures - Google Patents

Concrete structures Download PDF

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JP4547717B2
JP4547717B2 JP2004333715A JP2004333715A JP4547717B2 JP 4547717 B2 JP4547717 B2 JP 4547717B2 JP 2004333715 A JP2004333715 A JP 2004333715A JP 2004333715 A JP2004333715 A JP 2004333715A JP 4547717 B2 JP4547717 B2 JP 4547717B2
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concrete
concrete structure
side wall
formwork member
protrusion
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JP2006144311A (en
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康夫 渡辺
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日本サミコン株式会社
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本発明は、ボックスカルバートや橋梁の基礎などになるコンクリート構造体に関する。   The present invention relates to a concrete structure which becomes a box culvert or a foundation of a bridge.

従来、略箱型のコンクリート構造体として、現場製作やプレキャスト製のボックスカルバートが知られており、現場製作のものでは、現場での型枠組み等の作業が必要となるため、一般に施工性に劣る面があり、一方、プレキャスト製のものでは、それら型枠組み等の作業が不要となるため、現場での施工性に優れている。   Conventionally, on-site production and precast box culverts have been known as substantially box-shaped concrete structures, and on-site production requires work such as on-site formwork, which is generally inferior in workability. On the other hand, precast-made ones do not require work such as a mold frame, so they are excellent on site construction.

このようなコンクリート構造体において、部材を組立式にしたものがあり、永久型枠板を下面に設け、該永久型枠の上面に鉄筋を配筋してコンクリートを打設し、前記永久型枠の上面に鉄筋を配筋したコンクリート構造体（例えば特許文献１及び特許文献２）がある。
特開平９−１３４８６号公報 特開平８−１５９３３６号公報 In such a concrete structure, there is an assembly-type member, in which a permanent mold plate is provided on the lower surface, reinforcing bars are placed on the upper surface of the permanent mold frame, and concrete is placed, There are concrete structures (for example, Patent Document 1 and Patent Document 2) in which reinforcing bars are arranged on the upper surface of the steel sheet.
Japanese Patent Laid-Open No. 9-13486 JP-A-8-159336

上記コンクリート構造体では、平板状の永久型枠を部材間に掛け渡し、その永久型枠上にコンクリートを打設するものであり、前記永久型枠は、コンクリートを打設した際、撓みが所定量内に納まる強度を必要とする。これに対して、従来の永久型枠は平板状をなすため、掛け渡す部材間が広くなると撓みが大きくなり易く、これを防止するには鉄筋量などを増さなければならかなった。   In the concrete structure, a flat permanent mold is spanned between members, and concrete is placed on the permanent mold. The permanent mold is bent when the concrete is cast. Requires strength that falls within the quantification. On the other hand, since the conventional permanent mold has a flat plate shape, if the distance between the spanning members is widened, the deflection tends to increase. To prevent this, the amount of reinforcing bars has to be increased.

ところで、地中に埋設するボックスカルバートなどにおいては、施行中に一時的に上部の通行を確保する必要がある。しかし、上記のコンクリート構造体では、永久型枠の上にコンクリートを打設した後は、該コンクリートが硬化するまで、通行を確保することが難しかった。   By the way, in box culverts buried in the ground, it is necessary to temporarily secure upper passage during the operation. However, in the above-described concrete structure, after placing the concrete on the permanent mold, it is difficult to ensure the passage until the concrete is hardened.

そこで、本発明は、鉄筋量などを増やすことなく、撓みを抑えることができ、施工性に優れた型枠部材を用いるコンクリート構造体を提供することを目的とし、また、施行中に覆板等を用いて上部の通行を確保し易いコンクリート構造体を提供することを目的とする。   Therefore, the present invention aims to provide a concrete structure using a formwork member that can suppress bending without increasing the amount of reinforcing bars and the like, and has excellent workability. An object of the present invention is to provide a concrete structure that is easy to secure the passage of the upper part using the.

請求項１の発明は、左右対をなすコンクリート製の側壁部と、これら側壁部の下部を連結する底版部と、それら側壁部の上部間に掛け渡されたプレキャストコンクリート製の型枠部材上にコンクリートを打設して形成された頂版部とを備えたコンクリート構造体において、前記型枠部材の両端側に斜め下向きの傾斜部を設け、前記傾斜部は、その上面に略三角形の補強リブ部を一体に有し、この補強リブ部は、上面が略水平方向をなすと共に、端部面が略垂直方向をなすものである。 According to the first aspect of the present invention, a concrete side wall portion that forms a pair of left and right sides, a bottom plate portion that connects lower portions of the side wall portions, and a precast concrete formwork member spanned between the upper portions of the side wall portions. In a concrete structure having a top plate portion formed by placing concrete, obliquely downward inclined portions are provided on both end sides of the formwork member , and the inclined portions are substantially triangular reinforcing ribs on the upper surface thereof. The reinforcing rib portion has an upper surface in a substantially horizontal direction and an end surface in a substantially vertical direction .

また、請求項２の発明は、前記型枠部材の上面に、覆板載置用の突部を設けたものである。 According to a second aspect of the present invention, a projection for placing a cover plate is provided on the upper surface of the mold member .

また、請求項３の発明は、前記突部の両端側を低く形成したものである。   According to a third aspect of the present invention, both ends of the protrusion are formed low.

また、請求項４の発明は、前記傾斜部を直線状に形成したものである。 According to a fourth aspect of the present invention, the inclined portion is formed linearly .

請求項１の構成によれば、型枠部材は、中央の両端側に斜め下向きの傾斜部を有する略アーチ形をなすため、全体が平板状のものに比べて撓みが少ない構造となり、必要な鉄筋量及びコンクリート量を削減できる。   According to the configuration of the first aspect, the formwork member has a substantially arch shape having slanted downward inclined portions on both ends of the center, and therefore has a structure with less bending as compared with a flat plate as a whole. The amount of reinforcing bars and concrete can be reduced.

また、請求項２の構成によれば、施工途中において、側壁部の上部間に型枠部材を掛け渡した後や、型枠部材の上にコンクリートを打設した後、突部の上に直接又は間接的に覆板を敷き、次の工程までの間、通行を確保することができる。   Moreover, according to the structure of Claim 2, after constructing a formwork member between the upper part of a side wall part in the middle of construction, or after placing concrete on a formwork member, it is directly on a protrusion. Alternatively, a cover plate can be indirectly placed to ensure traffic until the next step.

また、請求項３の構成によれば、低くした部分と側壁部の上部間に鉄筋を配置し、その鉄筋を打設するコンクリート内に埋設することができる。   Moreover, according to the structure of Claim 3, a reinforcing bar can be arrange | positioned between the lowered part and the upper part of a side wall part, and it can embed in the concrete which lays the reinforcing bar.

また、請求項１の構成によれば、略三角形の補強リブ部により傾斜部の薄型化が可能となる。 Further, according to the configuration of the first aspect, the inclined portion can be thinned by the substantially triangular reinforcing rib portion.

また、請求項４の構成によれば、傾斜部を直線状に形成したから、その製造が容易である。Moreover, according to the structure of Claim 4, since the inclination part was formed in linear form, the manufacture is easy.

本発明における好適な実施の形態について、添付図面を参照しながら詳細に説明する。尚、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。各実施例では、従来とは異なる新規なコンクリート構造体を採用することにより、従来にないコンクリート構造体が得られ、そのコンクリート構造体について記述する。   Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, a new concrete structure different from the conventional one is employed, thereby obtaining an unprecedented concrete structure and describing the concrete structure.

以下、本発明の実施例を添付図面を参照して説明する。図１ないし図６は本発明の実施例１を示し、同図に示すように、コンクリート構造体１は、コンクリート製の左右の側壁部２，２と、これら側壁部２，２の下部間を連結するコンクリート製の底版部３と、それら側壁部２，２の上部を連結する頂版部４とを備える。前記左右の側壁部２，２と底版部３は、型枠を用いた現場打ちコンクリートにより構築されたり、一体型のプレキャストコンクリート製品により構成されたり、分割されたプレキャストコンクリート製品を組み立てて構成されたりする。   Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show a first embodiment of the present invention. As shown in FIG. 1, the concrete structure 1 has a concrete left and right side wall portions 2, 2 and a lower portion between the side wall portions 2, 2. A concrete bottom plate portion 3 to be connected and a top plate portion 4 to connect the upper portions of the side wall portions 2 and 2 are provided. The left and right side wall portions 2 and 2 and the bottom plate portion 3 are constructed of cast-in-place concrete using a formwork, are constructed of an integral precast concrete product, or are assembled by assembling divided precast concrete products. To do.

前記頂版部４は、プレキャストコンクリート製の型枠部材５と、この型枠部材５の上に打設して一体化される現場打ちコンクリート部６とからなる。前記型枠部材５は、前記側壁部２，２の上面２Ｕ，２Ｕ間に掛け渡され、左右方向（構造体の幅方向）中央の平板部51と、両端側に設けた斜め下向きの傾斜部52，52とを一体に備え、この傾斜部52は、ほぼ一定の厚さで前記平板部51より薄く、水平に対してほぼ４５度の角度をなし、コンクリートの内部に鉄筋７を埋設している。前記型枠部材５は、コンクリート構造体１の長さ方向にほぼ一定幅を有し、前記平板部51の前後方向（構造体の長さ方向）中央に、ほぼ一定幅の突部たる突条53を有し、該平板部51の左右両端側には、前記突条53の上面を低くした凹段部54がそれぞれ形成され、この凹段部54の端部は前記傾斜部52の上面に連続して斜めに形成されている。尚、凹段部54の上面も前記平板部51の上面より上方に位置している。また、前記傾斜部52の上面には前後方向中央に略三角形の補強リブ部55を一体に設けており、この補強リブ部55の上面はほぼ水平方向で、その端部面はほぼ垂直方向である。そして、前記突条53は前記平板部51の左右方向全長に形成されているから、上面に突出する突条53により型枠部材５の断面性能が向上し、撓み難い構造が得られる。   The top plate part 4 is composed of a precast concrete formwork member 5 and a cast-in-place concrete part 6 which is placed on and integrated with the formwork member 5. The mold member 5 is spanned between the upper surfaces 2U and 2U of the side wall portions 2 and 2, and has a flat plate portion 51 in the center in the left-right direction (width direction of the structure), and slanting downward inclined portions provided on both end sides. 52 and 52 are integrally provided, and the inclined portion 52 is thinner than the flat plate portion 51 with a substantially constant thickness, forms an angle of about 45 degrees with respect to the horizontal, and the reinforcing bar 7 is embedded in the concrete. Yes. The formwork member 5 has a substantially constant width in the length direction of the concrete structure 1 and is a protrusion that is a protrusion having a substantially constant width in the center of the flat plate portion 51 in the front-rear direction (length direction of the structure). A concave step portion 54 having a lower upper surface of the protrusion 53 is formed on each of the left and right ends of the flat plate portion 51, and an end portion of the concave step portion 54 is formed on the upper surface of the inclined portion 52. It is formed diagonally continuously. The upper surface of the recessed step portion 54 is also located above the upper surface of the flat plate portion 51. Further, a substantially triangular reinforcing rib portion 55 is integrally provided on the upper surface of the inclined portion 52 at the center in the front-rear direction. The upper surface of the reinforcing rib portion 55 is substantially horizontal and the end surface thereof is substantially vertical. is there. And since the said protrusion 53 is formed in the left-right direction full length of the said flat plate part 51, the cross-sectional performance of the formwork member 5 improves with the protrusion 53 which protrudes on an upper surface, and the structure which is hard to bend is obtained.

また、前記頂版部４には、複数のＰＣ鋼材挿通孔56がその前後方向に貫通形成され、構造物１の長さ方向に並べた複数の頂版部４の挿通孔56にＰＣ鋼材57を挿通し、それら複数の頂版部４を長さ方向に一体化する。尚、図中58は、頂版部４内に埋設した鉄筋である。   Further, a plurality of PC steel material insertion holes 56 are formed through the top plate portion 4 in the front-rear direction, and a PC steel material 57 is inserted into the insertion holes 56 of the plurality of top plate portions 4 arranged in the length direction of the structure 1. And the plurality of top plate portions 4 are integrated in the length direction. In the figure, 58 is a reinforcing bar embedded in the top plate portion 4.

図５に示すように、前記側壁部２の上面２Ｕには、前記型枠部材５の端部が係合する押さえ部材たるアンカーボルト11を固定し、このアンカーボルト11の上部は、前記型枠部材５の端部の孔又は切り欠き（図示せず）内に配置されて、前記型枠部材５端部の左右方向及び前後方向への移動が規制されている。尚、アンカーボルト11は、型枠部材５の端部に係合することにより、少なくとも型枠部材５の左右方向外側への移動を規制すればよい。また、前記型枠部材５の端部より外側で、前記上面２Ｕには、鉄筋継手12を固着し、この鉄筋継手12に略Ｌ型の鉄筋13の下部を固定し、該鉄筋13の鉄筋水平部13Ａを前記コンクリート部６内に埋設し、型枠部材５の幅方向中央側では、前記凹段部54内に前記鉄筋水平部13Ａを収納している。   As shown in FIG. 5, an anchor bolt 11 that is a pressing member with which an end of the mold member 5 is engaged is fixed to the upper surface 2U of the side wall portion 2. It arrange | positions in the hole or notch (not shown) of the edge part of the member 5, and the movement to the left-right direction and the front-back direction of the said mold member 5 is controlled. The anchor bolt 11 may be engaged with the end portion of the mold member 5 to restrict at least the movement of the mold member 5 outward in the left-right direction. Further, a reinforcing bar joint 12 is fixed to the upper surface 2U outside the end portion of the formwork member 5, and a lower part of a substantially L-shaped reinforcing bar 13 is fixed to the reinforcing bar joint 12. The portion 13A is embedded in the concrete portion 6 and the rebar horizontal portion 13A is accommodated in the concave step portion 54 on the center side in the width direction of the mold member 5.

次に前記構造体の施工方法につき説明すると、まず、図６に示すように、施工場所において、コンクリート製の左右の側壁部２，２と、これら側壁部２，２の下部間を連結するコンクリート製の底版部３とを構築する。次に、側壁部２，２の上面２Ｕ，２Ｕ間に、型枠部材５を掛け渡わたし、型枠部材５の端部にアンカーボルト11を係合する。このアンカーボルト11により、型枠部材５は、構造体１の幅方向及び前後方向の移動が規制される。したがって、この後、型枠部材５の上にコンクリートを打設しても型枠部材５の端部が左右方向に広がる移動を生じることがない。型枠部材５を設置した後、側壁部２，２の外側に型枠板（図示せず）を配置し、型枠部材５上のコンクリートを打設する。尚、コンクリートは突条53の上面とほぼ同一高さまで打設する。この後、図３に示すように、突条53の上にスペーサたる鋼材21を載せ、この鋼材21としてはＨ型鋼が用いられ、前後方向に隣り合う突条53の間で、鋼材21の上に覆板22を敷設し、該覆板22の上を通行可能とする。このようにコンクリートが硬化する前に、上部の通行を確保することができる。そして、コンクリートが硬化したら、覆板22と鋼材21とを撤去し、図１に示すように、上部を埋め戻すなどして通路を確保する。 Next, the construction method of the structure will be described. First, as shown in FIG. 6, in the construction site, the left and right side wall portions 2, 2 made of concrete and the concrete connecting the lower portions of the side wall portions 2, 2 are connected. The bottom plate part 3 made of the product is constructed. Next, the formwork member 5 is spanned between the upper surfaces 2U and 2U of the side wall parts 2 and 2, and the anchor bolt 11 is engaged with the end of the formwork member 5. The anchor bolt 11 restricts the movement of the structure member 1 in the width direction and the front-rear direction of the structure 1. Therefore, after that, even if concrete is placed on the formwork member 5, the end of the formwork member 5 does not move in the left-right direction. After the formwork member 5 is installed, a formwork plate (not shown) is disposed outside the side wall portions 2 and 2 and concrete on the formwork member 5 is placed. Note that the concrete is cast to the same height as the upper surface of the ridge 53. Thereafter, as shown in FIG. 3, a steel material 21 serving as a spacer is placed on the ridge 53, and an H-shaped steel is used as the steel material 21, and the steel material 21 is placed between the ridges 53 adjacent in the front-rear direction. A cover plate 22 is laid on the cover plate 22 so that it can pass over the cover plate 22. Thus, before the concrete hardens, it is possible to ensure the upper passage. Then, when the concrete is hardened, the cover plate 22 and the steel material 21 are removed, and as shown in FIG.

そして、上述した施工工程では、型枠部材５上にコンクリートを打設し、コンクリートの自重が型枠部材５に加わっても、両端側に傾斜部52を有する型枠部材５は撓み難く、平板状のものに比べて、型枠部材５に埋設する鉄筋量などを削減できる。   And in the construction process mentioned above, even if concrete is cast on the formwork member 5 and the weight of the concrete is applied to the formwork member 5, the formwork member 5 having the inclined portions 52 on both ends is difficult to bend. The amount of reinforcing bars embedded in the formwork member 5 can be reduced compared to the shape.

このように本実施例では、請求項１に対応して、左右対をなすコンクリート製の側壁部２，２と、これら側壁部２，２の下部を連結する底版部３と、それら側壁部２，２の上部間に掛け渡されたプレキャストコンクリート製の型枠部材５上にコンクリートを打設し、このコンクリート部６と型枠部材５とが一体化して形成された頂版部４とを備えたコンクリート構造体１において、型枠部材５の両端側に斜め下向きの傾斜部52，52を設けたから、型枠部材５は、中央の両端側に斜め下向きの傾斜部52，52を有する略アーチ形をなすため、全体が平板状のものに比べて撓みが少ない構造となり、必要な鉄筋量及びコンクリート量を削減できる。   Thus, in this embodiment, corresponding to claim 1, the concrete side wall parts 2 and 2 forming a pair of left and right sides, the bottom plate part 3 connecting the lower parts of these side wall parts 2 and 2, and the side wall parts 2 , 2 is provided with a top plate portion 4 in which concrete is cast on a precast concrete formwork member 5 spanned between upper portions of the two, and the concrete portion 6 and the formwork member 5 are integrally formed. In the concrete structure 1, since the slanting downward inclined portions 52, 52 are provided on both ends of the mold member 5, the mold member 5 has a substantially arch having slanting downward sloping portions 52, 52 on both ends of the center. Because of its shape, it has a structure with less deflection than a flat plate as a whole, and the amount of necessary reinforcing bars and concrete can be reduced.

また、このように本実施例では、請求項２に対応して、頂版部４の上面に、覆板載置用の突部たる突条53を設けたから、施工途中において、側壁部２，２の上部間に型枠部材５を掛け渡した後や、型枠部材５の上にコンクリートを打設した後、突条53の上に直接又は間接的に覆板22を敷き、次の工程までの間、通行を確保することができる。   In this way, in this embodiment, in correspondence with the second aspect, the protrusions 53 serving as the cover plate mounting protrusions are provided on the upper surface of the top plate part 4. After covering the formwork member 5 between the upper parts of 2 or placing concrete on the formwork member 5, the cover plate 22 is laid directly or indirectly on the ridge 53, and the next step Until then, traffic can be secured.

また、このように本実施例では、請求項３に対応して、突部たる突条53の両端側を低く形成したから、低くした部分である凹段部54と側壁部２の上部たる上面２Ｕ間に鉄筋13を配置し、その鉄筋13を打設するコンクリート内に埋設することができる。   In this way, in this embodiment, since both ends of the protrusion 53 as the protrusion are formed low in correspondence with the third aspect, the concave step portion 54 and the upper surface as the upper portion of the side wall portion 2 are formed. Reinforcing bars 13 can be arranged between 2U, and the reinforcing bars 13 can be embedded in the concrete to be placed.

また、このように本実施例では、請求項１に対応して、傾斜部52は、その上面に略三角形の補強リブ部55を一体に有し、この補強リブ部55は、上面が略水平方向をなすと共に、端部面が略垂直方向をなすから、補強リブ部55により傾斜部52の薄型化が可能となる。 Further, in the present embodiment in this way, in response to claim 1, the inclined portion 52, have a reinforcing rib portion 55 of a substantially triangular upper surface thereof integrally the reinforcing ribs 55, the upper surface is substantially horizontal In addition, the inclined surface 52 can be made thin by the reinforcing rib portion 55 because the end surface is substantially vertical .

また、実施例上の効果として、覆板22を載置するために用いる前記突条53を、平板部51の左右方向全長に形成したから、ほぼ一定厚さの平板部51の上面上に突出する前記突条53により、型枠部材５の断面性能が向上し、撓み難い構造が得られる。   Further, as an effect on the embodiment, since the protrusion 53 used for placing the cover plate 22 is formed on the entire length in the left-right direction of the flat plate portion 51, it protrudes on the upper surface of the flat plate portion 51 having a substantially constant thickness. By the protruding ridge 53, the cross-sectional performance of the mold member 5 is improved, and a structure that is difficult to bend is obtained.

また、このように本実施例では、請求項４に対応して、傾斜部52を直線状に形成したから、その製造が容易である。 Further, in the present embodiment in this way, in response to claim 4, since the inclined portion 52 is formed in a linear shape, it is relatively easy to manufacture.

なお、本発明は、前記実施例に限定されるものではなく、種々の変形実施が可能である。例えば、実施例では、直線状の傾斜部を示したが、請求項１〜３においては、傾斜部を湾曲状に形成してもよい。 In addition, this invention is not limited to the said Example, Various deformation | transformation implementation is possible. For example, in the embodiment, although the linear slope portion, in the claims 1 to 3, may be formed an inclined portion in a curved shape.

本発明の実施例１を示す全体断面図である。It is a whole sectional view showing Example 1 of the present invention. 同上、型枠部材の斜視図である。It is a perspective view of a formwork member same as the above. 同上、頂版部の断面図であり、施工中に覆板を用いた状態を示す。It is sectional drawing of a top plate part same as the above, and shows the state which used the cover board during construction. 同上、頂版部の凹段部回りの断面図である。It is sectional drawing around the concave step part of a top plate part same as the above. 同上、頂版部と側壁部との連結箇所の断面図である。It is sectional drawing of the connection location of a top plate part and a side wall part same as the above. 同上、施工工程を説明する断面図である。It is sectional drawing explaining a construction process same as the above.

１ コンクリート構造体
２ 側壁部
３ 底版部
４ 頂版部
５ 型枠部材
６ コンクリート部
22 覆板
52 傾斜部
53 突条（突部）
54 凹段部
55 補強リブ部
DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Side wall part 3 Bottom plate part 4 Top plate part 5 Formwork member 6 Concrete part
22 Cover plate
52 Slope
53 Projection (projection)
54 Concave step
55 Reinforcing rib

Claims (4)

左右対をなすコンクリート製の側壁部と、これら側壁部の下部を連結する底版部と、それら側壁部の上部間に掛け渡されたプレキャストコンクリート製の型枠部材上にコンクリートを打設して形成された頂版部とを備えたコンクリート構造体において、前記型枠部材の両端側に斜め下向きの傾斜部を設け、前記傾斜部は、その上面に略三角形の補強リブ部を一体に有し、この補強リブ部は、上面が略水平方向をなすと共に、端部面が略垂直方向をなすことを特徴とするコンクリート構造体。 Formed by placing concrete on a side wall made of concrete that forms a pair of left and right sides, a bottom slab that connects the lower parts of these side walls, and a precast concrete formwork member spanned between the upper parts of the side walls. In the concrete structure provided with the top plate portion, the inclined portion is provided obliquely downward on both ends of the mold member, and the inclined portion integrally includes a substantially triangular reinforcing rib portion on the upper surface thereof, the reinforcing ribs, together with the upper surface substantially forms a horizontal, concrete structure, characterized in that the end face is substantially perpendicular direction. 前記型枠部材の上面に、覆板載置用の突部を設けたことを特徴とする請求項１記載のコンクリート構造体。 The concrete structure according to claim 1, wherein a protrusion for placing a cover plate is provided on an upper surface of the formwork member . 前記突部の両端側を低く形成したことを特徴とする請求項２記載のコンクリート構造物。 The concrete structure according to claim 2, wherein both ends of the protrusion are formed low. 前記傾斜部を直線状に形成したことを特徴とする請求項１〜３のいずれか１項に記載のコンクリート構造物。 The concrete structure according to any one of claims 1 to 3, wherein the inclined portion is formed linearly .
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0398560U (en) * 1990-01-30 1991-10-14
JPH0913486A (en) * 1995-06-30 1997-01-14 Infuratetsuku Kk Concrete structure body
JPH11247273A (en) * 1998-02-26 1999-09-14 Nippon Samikon Kk Built-up concrete structure
JP2002070135A (en) * 2000-09-04 2002-03-08 Daiwa-Cres Co Ltd Hybridization construction method for large box culvert
JP2004218372A (en) * 2003-01-17 2004-08-05 Takaaki Endo Construction method for large-sized box culvert

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0398560U (en) * 1990-01-30 1991-10-14
JPH0913486A (en) * 1995-06-30 1997-01-14 Infuratetsuku Kk Concrete structure body
JPH11247273A (en) * 1998-02-26 1999-09-14 Nippon Samikon Kk Built-up concrete structure
JP2002070135A (en) * 2000-09-04 2002-03-08 Daiwa-Cres Co Ltd Hybridization construction method for large box culvert
JP2004218372A (en) * 2003-01-17 2004-08-05 Takaaki Endo Construction method for large-sized box culvert

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