JP2013133593A - Arch culvert and assembly construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arch culvert which is excellent in constructability for optimally constructing a water channel or a road under large amounts of embankments, and for easily carrying out molding in a factory for manufacturing, and for reducing a formwork price, and for quickly and surely carrying out imposition after conveyance to a construction site for construction.SOLUTION: By reinforced-concrete, an arch part 1 is imposed by connecting 5 members, that is, an apex arch member 2, right and left side arch members 3 and 3' and a pair of leg members 4 and 4' via connection means 5. The arch part is divided by an angle of almost 60° of a central angle α to form the apex arch member and the side arch members. The connection means is composed of a plurality of guide pipes 6 disposed in the width direction in the internal circumferential direction of the apex arch member, the side arch members and the leg members, and PC twisted wires 8 inserted into the guide pipes and having end parts 8a and 8b fixed by fixation means 7 to the leg members.

Description

  The present invention relates to an arch culvert and a method for assembling the arch culvert, which is most suitable for forming a waterway or a road under a large amount of embankment, especially for a large size, and can be easily formed at a factory for manufacturing. The formwork cost for placing concrete is inexpensive, and the construction can be performed quickly and reliably after transportation to the construction site, and the workability can be improved.

  Conventionally, for an arch culvert used for, for example, a waterway or a road, the arch portion has a central angle along a surface along a radius of 45 ° from the top, a surface along the horizontal, and a surface along a continuous radius. Is formed as a split surface, and the split portion is connected by a connecting member such as a bolt and a nut having a connecting force perpendicular to the horizontal surface. There were three parts that were transported to the construction site and assembled. And the internal diameter of this arch culvert was shape | molded by comparatively small about 1000 mm (refer patent document 1).

JP 58-20846 A

  However, in the above-described conventional arch culvert described in Patent Document 1, the arch portion has a central angle along a surface along a radius of 45 ° from the apex, a surface along the horizontal, and a further continuous radius. Since the surface is configured as a divided surface and is composed of a relatively small number of three members, one arch upper part and left and right arch lower parts, a large arch culvert having an inner diameter of tens of thousands of mm In the case of molding, the weight of each member is inevitably increased, and the transportation to the construction site and the assembly work take a lot of labor and time. Workability such as attachment was poor and inefficient. Therefore, the conventional arch culvert described in Patent Document 1 is suitable for forming, transporting, and constructing a relatively small arch culvert whose inner diameter is about 1000 mm.

  Further, in the conventional arch culvert described in Patent Document 1, the arch portion has a central angle along a surface extending along a radius of 45 ° from the top, a surface extending along a horizontal plane, and a continuous radius. Since the surface is configured as a split surface, and the split portion is connected by a connecting member such as a bolt and nut having a connecting force perpendicular to the horizontal surface, the vertical connection is performed after assembly and construction. When stress due to embankment load or external force is concentrated on a horizontal surface connected by a connecting member such as a bolt or nut that has force, a surface along a radius of 45 ° from the top at the central angle, and this surface The split surface constituted by the surface along the horizontal line and the surface along the continuous radius is easily damaged, and the joint portion by the bolt and nut is weak in strength.

  The present invention solves the above-mentioned conventional drawbacks, is suitable for a large arch culvert, has a small weight for each member constituting the arch culvert, and has a workability such as transportation to a construction site and assembly at a construction site. The top arch member constituting the arch culvert, the side arch member connected to the lower portions of the left and right ends, and the leg members opposed to the lower portions of the left and right ends. An object of the present invention is to provide an arch culvert having a structurally strong strength at a connecting portion of five members and an assembling method thereof.

The present invention has been made in view of the above problems, and the invention according to claim 1 is a side arch member in which an arch portion is connected to a top arch member and lower left and right ends of the top arch member by reinforced concrete. And an arch culvert for assembling a pair of left and right symmetrical leg members connected to opposite left and right lower ends of the side arch member, and connecting and connecting five members via connecting means. ,
The top arch member and the side arch member are molded by dividing the arch part at a central angle of approximately 60 °,
The connecting means is inserted into the guide tube and a plurality of guide tubes provided in the width direction in the inner circumferential direction of the top arch member, the side arch member, and the leg member, and an end portion thereof is The leg member is composed of a PC twisted wire fixed by a fixing means.

  According to a second aspect of the present invention, in the first aspect, the fixing means is slidable in the axial direction in the tapered outer tube having a tapered taper hole on the inner surface and the tapered hole. It is inserted into a double pipe structure with a tightened inner pipe having a substantially frustoconical cross section having a tapered circumferential surface on the outer periphery and a twisted wire insertion hole in the center. And

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the PC stranded wire and the fixing means are short on the outer side of the lower end of the leg member. It is formed into an invert type projecting in the horizontal direction with a length, or formed into a footing type projecting in the horizontal direction with a long length.

According to a fourth aspect of the present invention, there is provided a top arch member obtained by dividing the arch portion at a central angle of about 60 ° by reinforced concrete, and a side arch member connected to the left and right lower portions of the top arch member. And an arch culvert assembling method for assembling a pair of left and right symmetrical leg members connected to the left and right lower parts of the side arch members and connecting five members via connecting means There,
A step of temporarily tensioning the top arch member and the left and right side arch members through hypothetical wearing means by inserting a plurality of PC stranded wires in the width direction into the interior in a state of lying down on the ground;
Fixing the leg member to a predetermined position in a longitudinal direction opposite to each other with a predetermined interval;
Lifting and transferring the top arch member and the side arch member from the ground directly above the leg member with a crane;
Placing the lower end of the side arch member at a predetermined position on the upper surface of the leg member;
Deriving the lower end of the PC twisted wire arranged in the circumferential direction in the top arch member and the side arch member from the lower end outside of the leg member to the outside;
Tensioning the lower end of the PC stranded wire with a jack, integrating the top arch member, the side arch member, and the leg member by the tension of the PC stranded wire, and fixing by a fixing means;
The PC twisted wire and the fixing means comprise a step of solidifying an adhesive layer portion made of an adhesive and forming it on the lower end outside of the leg member.

  According to a fifth aspect of the present invention, in the fourth aspect, the hypothetical attachment means and the fixing means include a tightening outer tube having a tapered tapered hole on an inner surface, and an axial direction in the tapered hole. Is formed into a double tube structure by a tightened inner tube having a substantially frustoconical cross section having a tapered peripheral surface at the outer periphery and a twisted wire insertion hole at the center. It is characterized by.

  According to a sixth aspect of the present invention, in the fourth or fifth aspect, the adhesive layer portion is formed into an invert shape in which the adhesive layer portion protrudes in a horizontal direction with a short length, or a long length. It is formed into a footing type that protrudes in the horizontal direction.

  According to the first aspect of the present invention, a reinforced concrete is used to connect the arch portion to the top arch member, the side arch member connected to the left and right ends of the top arch member, and the side arch member. An arch culvert in which a pair of left and right symmetrically connected leg members connected to opposite left and right lower ends and five members formed by connecting via connecting means are assembled, the arch portion having a central angle The top arch member and the side arch member are formed by being divided at an angle of approximately 60 °, and the connecting means is formed in the inner circumferential direction of the top arch member, the side arch member, and the leg member. Since a plurality of guide tubes provided in the width direction and PC twisted wires that are inserted into the guide tubes and are fixed to the leg members by fixing means, the reinforced concrete is used. The top arch member constituting the arch part, and the left and right side arch members, a pair of leg members, and a pair of leg members are molded and divided into five members, which is suitable for molding a large box culvert. Each member constituting the arch culvert has a small weight and can be easily transported to a construction site.

  The arch portion includes a top arch member divided at a central angle of approximately 60 °, and side arch members connected to the lower portions on both the left and right sides, and is opposed to the lower portions on both the left and right sides. The leg members and the five members are tensioned by inserting PC stranded wires in a plurality of guide tubes provided in the width direction in the inner circumferential direction thereof, and the end portions thereof are fixed to the leg members. Since the arch culvert is constructed by being fixed by the means, the workability is good and the work can be efficiently performed such as assembly at the construction site.

  The top arch member divided by a central angle of about 60 ° and the side arch members connected to the lower left and right ends constitute an arch, and are opposed to the lower left and right ends. The five members composed of the leg members are tensioned by inserting PC stranded wires in a plurality of guide tubes provided in the width direction in the inner circumferential direction thereof, and the end portions thereof are fixed to the leg members. Since the arch culvert is assembled by being fixed by the arch culvert, a rigid connection is achieved. Since the assembled arch culvert exhibits high rigidity and is dispersed when stress due to embankment load or external force is applied, it is rigidly connected by the PC stranded wire as described above, so that the top arch The connection surfaces of the members, the side arch members, and the leg members opposed to the lower portions of the left and right ends are not easily damaged, and the connection is strong in strength. And high rigidity is exhibited also with respect to an offset load.

  According to a second aspect of the present invention, in the first aspect, the fixing means includes a tightening outer tube having a tapered taper hole on the inner surface, and an axial slide in the tapered hole. Because it is formed into a double tube structure by a tightened inner tube having a substantially frustoconical cross section with a taper circumferential surface on the outer periphery and a twisted wire insertion hole in the center. In order to temporarily tension and temporarily fix a PC twisted wire, a truncated cone with a tapered peripheral surface provided on the outer periphery which is slidable in the axial direction in a tapered taper hole provided on the inner periphery of the tightening outer tube Insert the PC stranded wire into the stranded wire insertion hole provided in the center of the shape of the tightened inner tube, and tap the inner tube to be tightened from below with a hammer. Is received, and the PC stranded wire is temporarily tensioned and temporarily fixed.

  According to the invention described in claim 3 of the present invention, the adhesive layer portion according to claim 1 or 2, wherein the PC twisted wire and the fixing means are solidified by an adhesive on the outer bottom end of the leg member. Is formed into an invert type having a short length protruding in the horizontal direction, or formed into a footing type having a long length protruding in the horizontal direction, so that the PC stranded wire and the fixing means are adhesives When the adhesive layer that is solidified is molded into an invert type with a short length protruding in the horizontal direction, the ground reaction force can be reduced and it is optimal for the site where the ground bearing strength of the foundation ground is low. .

  Further, when the PC twisted wire and the fixing means are formed into a footing type in which an adhesive layer portion solidified by an adhesive is protruded in a horizontal direction with a long length, the stability of the casing is ensured. . And it is most suitable for the site where embankment is big.

  According to the fourth aspect of the present invention, the top arch member obtained by dividing the arch portion at a central angle of about 60 ° by reinforced concrete, and the side portions connected to the left and right lower portions of the top arch member Assembling and construction of an arch culvert in which an arch member, a pair of left and right symmetrically connected leg members connected to the left and right lower parts of the side arch member, and five members composed of the arch member are connected and connected via a connecting means In the method, the top arch member and the left and right side arch members are laid down on the ground, and a plurality of PC stranded wires are inserted through them in the width direction to temporarily connect the temporary arch members via the assumed attachment means. A step of tensioning, a step of fixing the leg member to a predetermined position in a longitudinal direction opposite to each other at a predetermined interval, and the top arch member and the side arch member from the ground to directly above the leg member. clay And a step of placing the lower end of the side arch member at a predetermined position on the upper surface of the leg member, and a circumferential direction within the top arch member and the side arch member. A step of drawing the lower end of the PC twisted wire from the outside of the lower end of the leg member to the outside, and tensioning the lower end of the PC twisted wire with a jack, and the top arch member and the side arch by the tension of the PC twisted wire. A member, a step of integrating the leg member and fixing by a fixing means, and a step of the PC twisted wire and the fixing means solidifying an adhesive layer portion made of an adhesive to form outside the lower end of the leg member. Because it is provided with a reinforced concrete, it is divided into five members consisting of a top arch member that constitutes the arch part, left and right side arch members, a pair of leg members, and a large arch culvert In addition, the weight of each member constituting the arch culvert can be reduced, and transportation to the construction site can be easily performed.

  The arch portion includes a top arch member divided at a central angle of approximately 60 °, and side arch members connected to the lower portions on both the left and right sides, and is opposed to the lower portions on both the left and right sides. The leg member and the five members are tensioned by inserting a PC twisted wire into a guide tube provided in the width direction in the inner circumferential direction thereof, and its end is the lower end of the leg member. Since the arch culvert is constructed by being fixed by the fixing means on the outside, the workability such as assembly at the construction site is good and the work can be performed efficiently.

  The top arch member divided by a central angle of about 60 ° and the side arch members connected to the lower left and right ends constitute an arch, and are opposed to the lower left and right ends. The five members composed of the leg members, the PC stranded wires are inserted into a guide tube provided in the width direction in the inner circumferential direction thereof, are tensioned, and the end portions thereof are fixed to the leg members. As a result, the arch culvert is rigidly connected. In addition, the entire assembled arch culvert exhibits high rigidity, and when stress due to embankment load or external force is applied, the stress is dispersed and, as described above, is rigidly connected by the PC twisted wire. The connecting surfaces of the five members composed of the top arch member, the side arch member, the leg member, and the like are not easily damaged, and the connection has a robust structure. And high rigidity is exhibited also with respect to an offset load.

According to the fifth aspect of the present invention, in the fourth aspect, the hypothetical attachment means and the fixing means include a tightening outer tube having a tapered taper hole on the inner surface, and the taper hole. A double-tube structure is formed by a clamped inner tube having a substantially frustoconical cross section with a tapered circumferential surface inserted in the axial direction, a tapered peripheral surface on the outer periphery, and a stranded wire insertion hole in the center. Since it is formed, the PC twisted wire is temporarily tensioned and temporarily fixed, or the PC twisted wire is tensioned and fixed in the tapered taper hole on the inner periphery of the tightening outer tube in the axial direction. PC stranded wire is inserted into the stranded wire insertion hole provided in the center of the inner tube with a truncated cone shape with a tapered peripheral surface provided on the outer periphery, and the product is tightened with a hammer. by Komu waterfall叩from the lower side of the tube, temporarily tensioned PC stranded wire reaction force by outer tube tightening receiving the inner tube clamp object, temporarily fixed Luke, or tense the PC stranded wire, are fixed.

  According to the invention described in claim 6 of the present invention, in claim 4 or 5, the adhesive layer portion is formed in an invert form protruding in a horizontal direction with a short length, or a long length. The PC twisted wire and the fixing means are molded into an invert type in which the adhesive layer solidified by the adhesive is projected in the horizontal direction with a short length. In this case, the ground reaction force can be reduced, and it is most suitable for the site where the ground bearing capacity of the foundation ground is low.

  Further, when the PC twisted wire and the fixing means are formed into a footing type in which an adhesive layer portion solidified by an adhesive is protruded in a horizontal direction with a long length, the stability of the casing is ensured. . And it is most suitable for the site where embankment is big.

FIG. 1 is a cross-sectional view showing an assembled state of an embodiment of the arch culvert of the present invention. FIG. 2 is a cross-sectional view of the initial process at the time of assembling construction, as seen from above, with the arch portion lying on the ground at the construction site. FIG. 3 is a perspective view of the arch portion, as viewed from above, with the arch portion lying down on the ground of the construction site. FIG. 4 is a cross-sectional view showing a state in which the arch portion is similarly lifted on the leg member by a crane. FIG. 5 is an enlarged cross-sectional view showing an assumed fixing means or fixing means for fixing a PC twisted wire used in the present embodiment. FIG. 6 is an enlarged sectional view showing a state in which the end portion of the PC stranded wire is fixed to the leg member by the fixing means. FIG. 7 also shows a modification of the arch culvert of the present invention.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  In the present embodiment, reinforced concrete is used to connect the arch portion 1 to the top arch member 2, the side arch members 3 and 3 ′ connected to the lower left and right ends of the top arch member 2, and the side arch members 3 and 3. An arch culvert A in which a pair of left and right symmetrical leg members 4, 4 'connected to opposite left and right lower ends of ′ and five members composed of them are connected and connected via connecting means 5. The top arch member 2 and the side arch members 3 and 3 'are formed by dividing the arch portion 1 at an angle of about 60 ° with a central angle α, and the connecting means 5 is connected to the top arch. A plurality of guide tubes 6 provided in the width direction Q in the inner circumferential direction of the member 2, the side arch members 3, 3 ′, and the leg members 4, 4 ′; The end portions 8a and 8b are fixed to the leg members 4 and 4 'by the fixing means 7. Plural, is constituted by the five PC stranded wire 8 in this embodiment shown.

  In the present embodiment shown in FIG. 1, the inner diameter φ of the arch culvert A is a large size of several tens of thousands mm, for example, 10,000 mm or more, and the top arch member 2 constituting the arch portion 1 and the left and right sides of the top arch member 2 The side arch members 3, 3 'connected to the lower portions of both ends and the pair of leg members 4, 4' are formed into a small size by forming, for example, 1.5 to 2 m per piece. It is easy to move and transport.

  The fixing means 7 is for, for example, tensioning and fixing both end portions 8a and 8b of the PC stranded wire 8 to the leg members 4 and 4 '. The fixing means 7 is the same as the assumed attachment means 10 described later. The fasteners are used.

  As shown in FIG. 4, the hypothetical wearing means 10 tentatively tensions the top arch member 2 and the side arch members 3, 3 ′ with the PC stranded wires 8 as shown in FIG. For example, as shown in FIG. 5, when tightened and temporarily fixed at this position and lifted by a crane, a tightening outer tube 11 having a tapered taper hole 11 a on the inner surface, and the taper hole 11 a in the axial direction. It is inserted in a slidable manner, and has a tapered peripheral surface 12a on the outer periphery, and a tightened inner tube 12 having a substantially frustoconical cross section having a stranded wire insertion hole 12b in the center, thereby forming a double tube structure. Is formed. P is an anchor plate interposed between the assumed wearing means 10 and the arch portion 1.

  As shown in FIG. 1 and FIG. 6, an adhesive layer portion 9 where the PC twisted wire 8 and the fixing means 7 are solidified by the adhesive S has a short length L1. Or an invert type In that protrudes in the horizontal direction, or a footing type F that protrudes in the horizontal direction with a long length L2 as shown in FIG. For example, concrete is used as the adhesive S, and a synthetic resin adhesive is used.

  Thus, when the PC twisted wire 8 and the fixing means 7 are formed into an invert type In in which the adhesive layer portion 9 solidified by the adhesive S protrudes in the horizontal direction with a short length L1 (FIG. 1). 4 and FIG. 6), the ground reaction force can be reduced, and it is optimum for a site where the ground strength of the foundation ground is low. Further, when the PC stranded wire 8 and the fixing means 7 are formed into a footing type F in which the adhesive layer portion 9 solidified by the adhesive S protrudes in the horizontal direction with a long length L2 (see FIG. 7). The stability of the housing is ensured. And banking is ideal for large sites.

  13 is inserted into the guide tube 6 provided in the top arch member 2, the side arch members 3, 3 ', and the leg members 4, 4' to be strained, and injected after fixing. The grout material 13 is solidified, and the grout material 13 is guided from the filling hole 14 provided in the radial direction in the top arch member 2, the side arch members 3, 3 ', and the leg members 4, 4'. The PC stranded wire 8 is fixed by being filled in the tube 6, and the PC stranded wire 8 is prevented from being rusted. Reference numeral 15 denotes a foundation concrete portion placed between the leg members 4 and 4 '.

  The embodiment of the arch culvert A according to the present invention has the above-described configuration, and the top arch member 2 divided by reinforced concrete at a central angle α at an angle of about 60 °, and the lower left and right ends of the top arch member 2 An arch portion 1 is constituted by the side arch members 3 and 3 'to be connected, and a pair of leg members 4 and 4' connected to lower portions at both ends of the side arch members 3 and 3 '. Therefore, the arch portion is divided into a surface along the radius of 45 ° from the top at the central angle, a surface along the horizontal, and a surface along the continuous radius. The above-mentioned conventional box culvert described in Patent Document 1 configured as a dividing surface and composed of a relatively small number of three members, ie, an arch upper part and left and right arch lower parts, has a large diameter having an inner diameter of tens of thousands of mm. Arch of Calvert In the case of molding, the weight of each member is inevitably increased. Unlike the embodiment, the illustrated embodiment is suitable for a large arch culvert and has a member length for each member constituting the arch culvert. Becomes 1.5 to 2.0 m, is light in weight, and can be easily transported to a construction site.

  In order to assemble the transported members at the construction site, first, as a first step, the top arch member 2 in which the arch portion 1 is divided at a central angle α by about 60 ° by reinforced concrete, and The side arch members 3 and 3 'connected to the left and right lower portions of the top arch member 2 are placed on the ground G in a state where the side arch members 3 and 3' are overlaid on the ground G, as shown in FIGS. By inserting a plurality of, for example, five PC stranded wires 8 in the circumferential direction of the members 3 and 3 'in the width direction Q, for example, provisional tensioning means 10 as shown in FIG. , Temporarily fix.

  At this time, in order to insert the PC stranded wire 8 into the top arch member 2 and the side arch members 3 and 3 ', the width direction in the circumferential direction is inserted into the top arch member 2 and the side arch members 3 and 3'. Five PC twisted wires 8 are inserted into a guide tube 6 provided with a plurality, for example, five in Q. And in order to lift the PC stranded wire 8 at a position that is just right for lifting, temporary tensioning is performed by using, for example, an assumed wearing means 10 as shown in FIG. In order to temporarily tension and temporarily fix the PC twisted wire 8 using a taper, a tapered peripheral surface 12a that can slide in the axial direction is inserted into a tapered taper hole 11a provided on the inner periphery of the tightening outer tube 11. The PC stranded wire 8 is inserted into the stranded wire insertion hole 12b provided at the center of the inner tube 12 having a truncated cone shape provided in the section, and the inner tube 12 to be tightened is attached with a hammer (not shown). By tapping from below, the inner tube 12 to be tightened receives the reaction force from the tightening outer tube 11, the diameter is reduced, the tightening force is exerted, the PC stranded wire 8 is temporarily tensioned, and temporary fixing is performed. Is called. As described above, the assumed wearing means 10 shown in FIG. 5 of the present embodiment is configured so that the temporary tension of the arch portion 1 including the top arch member 2 and the side arch members 3 and 3 ′ and Fixing can be done quickly and reliably.

  Moreover, as described above, with the top arch member 2 and the side arch members 3 and 3 'lying down on the ground G, the PC stranded wire 8 is inserted into the interior to temporarily tension and temporarily fix. After inserting the PC twisted wire 8 into the guide tube 6 and inserting the PC twisted wire 8 into the guide tube 6 provided in the top arch member 2 and the side arch members 3, 3 ′ This is to perform temporary tension and temporary fixing quickly, reliably and safely.

  Next, as a second step, the leg members 4 and 4 ′ are fixed at predetermined positions in the longitudinal direction I so as to face each other with a predetermined interval K therebetween. This fixing is preferable because the structure becomes solid if it is reinforced by placing a foundation concrete portion 15 between the leg members 4 and 4 'at the construction site.

  Then, as described above, as described above, the top arch member 2 and the side arch members 3 and 3 ′ that are temporarily tensioned and temporarily fixed are moved from the ground G to directly above the leg members 4 and 4 ′. And lifted and transferred by a crane (see FIG. 4). Then, the lower ends of the side arch members 3, 3 'are placed at predetermined positions on the upper surfaces of the leg members 4, 4'.

  At this time, in the assumed attachment means 10 shown in FIG. 5 of the present embodiment, the load W of the arch portion 1 composed of the top arch member 2 and the side arch members 3 and 3 ′ is applied to the tightening outer tube 11 when suspended. By adding from above via the anchor plate P, the tapered peripheral surface 12a is slidably inserted into the tapered hole 11a by the wedge function of the tapered tapered hole 11a provided on the inner periphery of the tightening outer tube 11. Since the tightening force for the tightened inner tube 12 having the outer periphery of the arch portion 1 is further enhanced, even if external vibration is applied or the arch portion 1 is biased during suspension, the arch portion 1 is being lifted. In addition, the temporary tension and the temporary fixing can be lifted and transferred safely and reliably without loosening.

  Thereafter, as a fourth step, the bottom ends of the five PC stranded wires 8 arranged in the circumferential direction in the top arch member 2, the side arch members 3, 3 ', and the leg members 4, 4' are formed. As shown in FIGS. 1, 6, and 7, the leg members 4, 4 ′ are led out from the outer periphery of the lower end.

  At this time, among the plurality of, for example, five PC stranded wires 8, the three PC stranded wires 8 are fastened to the assumed attachment means 10 provided at a position that is just suitable for suspension as shown in FIG. In the tapered taper hole 11a of the outer tube 11, by pulling the tightened inner tube 12 downward, the temporary tightening and temporary fixing of the PC twisted wire 8 inserted into the twisted wire insertion hole 12b are not understood. However, for the sake of safety without causing an accident, tightening of the assumed fastening means 10 with respect to the two PC stranded wires 8 with respect to the top arch member 2 and the side arch members 3 and 3 'by the tightened inner tube 12 is performed. The top arch member 2 and the side arch members 3 and 3 'are not separated apart, and the two end portions 8a and 8b of the five PC stranded wires 8 are maintained without being separated. Is led out from the outer periphery of the lower end of the leg member 4, 4 '. I will let you.

  Then, as a fifth step, both end portions 8a and 8b of the PC stranded wire 8 are tensioned by a jack, and are fixed to the outer periphery of the lower ends of the leg members 4 and 4 'by the fixing means 7. At this time, as the fixing means 7, both ends 8a and 8b of the PC twisted wire 8 are fixed by using a fastener having the same structure as the assumed attaching means 10 as shown in FIG. And after letting out the above-mentioned three PC twisted wires 8 from which the temporary tension | tensile_strength of the to-be-clamped inner tube | pipe 12 of the temporary attachment means 10 temporarily fixed was released | extricated from the outer periphery of the lower end of the leg members 4 and 4 outside. Next, temporary fixing of the remaining two PC twisted wires 8 that have not been loosened and then tightened the inner pipe 12 of the assumed fastening means 10 with respect to the three PC twisted wires 8 described above, Then, both ends 8a and 8b are led out from the outer periphery of the lower ends of the leg members 4 and 4 to be fixed.

  Furthermore, as a sixth step, the PC twisted wire 8 and the fixing means 7 form an adhesive layer portion 9 solidified by an adhesive S made of concrete or synthetic resin on the outer bottom end of the leg members 4 and 4 '. As a result, the structure is firmly fixed.

  At this time, as shown in FIGS. 1 and 6, the PC twisted wire 8 and the fixing means 7 are inverted in which the adhesive layer portion 9 solidified by the adhesive S protrudes in the horizontal direction with a short length L1. In the case of being formed into the type In, the ground reaction force can be reduced, and it is optimal for the site where the ground bearing strength of the foundation ground is low. Further, as shown in FIG. 7, the PC twisted wire 8 and the fixing means 7 are formed into a footing type F in which the adhesive layer portion 9 solidified by the adhesive S protrudes in the horizontal direction with a long length L2. In this case, the stability of the housing is ensured. And banking is ideal for large sites.

  Thus, the arch culvert A of this embodiment is completed in the assembling work.

  Thus, as shown in FIG. 1, the arch culvert A of the present embodiment is connected to the top arch member 2 in which the arch portion 1 is divided at a central angle of approximately 60 °, and to the left and right lower ends. It is composed of side arch members 3, 3 'and 5 members composed of leg members 4, 4' opposed to the lower left and right ends. Molded.

  At this time, the arch portion 1 is constituted by the top arch member 2 divided by the central angle α at an angle of about 60 °, and the side arch members 3 and 3 ′ connected to the lower left and right ends. The top arch member 2 and the left and right side arch members 3 and 3 'form the left and right leg members 4 and 4' together with a single mold (not shown). The other one mold (not shown in the figure) is used for the top arch member 2 constituting the arch portion 1 and the left and right side arch members 3. The three members 3 'and the left and right leg members 4 and 4' are molded, and the frame cost is low even when a large arch culvert is molded.

  Then, the top arch member 2 constituting the arch portion 1, the left and right side arch members 3, 3 ', and the five members including the left and right leg members 4, 4' are arranged in the width direction Q in the inner circumferential direction thereof. PC twisted wires 8 are inserted into a plurality of provided guide tubes 6 and are tensioned, and both end portions 8a and 8b are connected to the leg members 4 and 4 'by being fixed by the fixing means 7. Since the arch culvert A is constructed, the workability is good and the work can be performed efficiently such as assembly at the construction site.

  Moreover, the arch portion 1 is constituted by the top arch member 2 having a central angle α divided by an angle of about 60 ° and the side arch members 3, 3 ′ connected to the lower portions of the left and right ends, and The leg members 4, 4 'opposed to the lower left and right ends, and the five members composed of PC twisted wires 8 inserted into a plurality of guide pipes 6 provided in the inner circumferential direction thereof, are tensioned. Since both ends 8a and 8b of the PC stranded wire 8 are connected to the leg members 4 and 4 'by being fixed by the fixing means 7, a rigid coupling is achieved and the assembled arch culvert A Is highly rigid and dispersed when stress due to embankment load or external force is applied. Since it is rigidly connected by the PC stranded wire 8 as described above, the connecting surface is not easily damaged, and the connection is strong. Robust structure. And high rigidity is exhibited also with respect to an offset load.

  In the above description, the connecting means 5 guides the five PC stranded wires 8 in the width direction Q in the inner circumferential direction of the top arch member 2, the side arch members 3, 3 ', and the leg members 4, 4'. When the top arch member 2 and the side arch portions 3, 3 ′ are lifted and fixed to the leg members 4, 4 ′ by being inserted into the pipe 6, the top arch member 2 out of the five members, and First, the temporary tension and the temporary fixation of the three PC stranded wires 8 inserted in the side arch members 3 and 3 'are first released, and the PC stranded wires 8 are moved outside the lower edges of the leg members 4 and 4'. The top arch member 2 and the side arch portions 3 and 3 ′ to be assembled by maintaining the temporary tension and temporary fixation of the remaining two PC stranded wires 8 while the main fixing is completed. Are separated from each other, and then both end portions 8a and 8b of the two PC stranded wires 8 are outside the lower edge of the leg members 4 and 4 '. The PC stranded wire 8 is inserted in the inner circumferential direction of the top arch member 2, the side arch members 3, 3 ′, and the leg members 4, 4 ′. As described above, the number is not limited to five and may be two or more. At this time, the top arch member 2 and the side arch members 3, 3 'are lifted and used for the main fixing prior to the leg members 4, 4', the lifted top arch members 2, and When the side arch members 3 and 3 'are fixed to the leg members 4 and 4', they are separated from those used for maintaining the integration while preventing them from being separated. This is the scope of the invention.

  The present invention is suitable for large-sized arch culverts, has a small weight for each member constituting the arch culvert, has good workability and efficient work such as transportation to the construction site and assembly at the construction site. The strength at the connecting portion of the five members which can be performed, and comprises the top arch member constituting the arch culvert, the side arch member connected to the lower portions of the left and right ends, and the leg members opposed to the lower portions of the left and right ends. Is suitable for structurally robust applications and functions.

DESCRIPTION OF SYMBOLS 1 Arch part 2 Top arch member 3 Side arch member 3 'Side arch member 4 Leg member 4' Leg member 5 Connection means 6 Guide pipe 7 Fixing means 8 PC twisted wire 8a End part 8b End part 9 Adhesion layer part 10 Assumption Attachment means 11 Clamping outer tube 11a Tapered hole 12 Clamped inner tube 12a Tapered peripheral surface 12b Stranded wire insertion hole 15 Foundation concrete part A Arch culvert I Longitudinal direction P Anchor plate Q Width direction W Load α Center angle

Claims (6)

By reinforced concrete, the arch part is connected to the top arch member, the side arch member connected to the lower left and right ends of the top arch member, and the right and left symmetrical shape connected to the lower left and right ends of the side arch member. An arch culvert for connecting and assembling a pair of leg members and five members formed by connecting means,
The top arch member and the side arch member are molded by dividing the arch part at a central angle of approximately 60 °,
The connecting means is inserted into the guide tube and a plurality of guide tubes provided in the width direction in the inner circumferential direction of the top arch member, the side arch member, and the leg member, and an end portion thereof is An arch culvert comprising a plurality of PC stranded wires fixed to a leg member by fixing means.   The fixing means is inserted into the tapered outer tube having a tapered taper hole on the inner surface, and is slidably inserted in the taper hole in the axial direction. The outer periphery has a tapered peripheral surface, and a stranded wire is inserted in the center. 2. The arch culvert according to claim 1, wherein the arch culvert is formed into a double pipe structure by a tightened inner pipe having a substantially truncated cone shape having a hole.   The PC twisted wire and the fixing means are formed on the outer side of the lower end of the leg member in an invert form in which an adhesive layer portion solidified by an adhesive is projected in a horizontal direction with a short length, or a long length. The arch culvert according to claim 1, wherein the arch culvert is formed into a footing type projecting in a horizontal direction. A top arch member obtained by dividing the arch portion at a central angle of about 60 ° by reinforced concrete, a side arch member connected to the left and right lower portions of the top arch member, and a left and right lower portion of the side arch member An arch culvert assembling method for assembling a pair of symmetrically connected leg members and five members formed by connecting via connecting means,
A step of temporarily tensioning the top arch member and the left and right side arch members through hypothetical wearing means by inserting a plurality of PC stranded wires in the width direction into the interior in a state of lying down on the ground;
Fixing the leg member to a predetermined position in a longitudinal direction opposite to each other with a predetermined interval;
Lifting and transferring the top arch member and the side arch member from the ground directly above the leg member with a crane;
Placing the lower end of the side arch member at a predetermined position on the upper surface of the leg member;
Deriving the lower end of the PC twisted wire arranged in the circumferential direction in the top arch member and the side arch member from the lower end outside of the leg member to the outside;
Tensioning the lower end of the PC stranded wire with a jack, integrating the top arch member, the side arch member, and the leg member by the tension of the PC stranded wire, and fixing by a fixing means;
The PC twisted wire and the fixing means comprise a step of solidifying an adhesive layer portion made of an adhesive and forming it on the outer side of the lower end of the leg member.   The hypothetical attachment means and the fixing means are inserted into a tightening outer tube having a tapered taper hole on the inner surface, and slidable in the axial direction in the taper hole, and have a tapered peripheral surface on the outer periphery, 5. The method of assembling an arch culvert according to claim 4, wherein the inner pipe is formed into a double pipe structure by a tightened inner pipe having a substantially frustoconical section having a twisted wire insertion hole. .   5. The adhesive layer according to claim 4, wherein the adhesive layer portion is formed into an invert shape protruding in a horizontal direction with a short length, or formed into a footing shape protruding in a horizontal direction with a long length. 5. An arch culvert assembling method according to 5.

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