JP2009209600A - Jointing structure for precast member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining structure for a precast member of excellent durability, can join the fellow precast members with a high proof-stress. <P>SOLUTION: This joining structure joins fellow precast floor plates 1, 1 arranged with a clearance 13. A perforated steel plate 3 with one part embedded in an inside is projected to arrange at least one hole 31 in the clearance, in joining side end parts 11 of both precast floor plates, the holes 31 of the perforated steel plate 3 projected from both precast floor plates are made substantially consistent in view from a direction right-angled to a face, in the clearance, a fill is filled into the clearance, and a prestress is introduced into a filled part 35 with the fill by an unbonded PC steel wire 33 inserted through the holes. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a joint structure for precast members such as floor slabs laid on bridges, artificial ground, and the like.

  Conventionally, it is known that precast floor slabs are manufactured at a factory using reinforced concrete or prestressed concrete, and these precast floor slabs are joined on site to form bridge floor slabs (see Patent Documents 1 and 2).

Moreover, many joining structures for joining such precast members are disclosed in Patent Documents 3 and 4 in addition to the above-mentioned documents.
Japanese Patent No. 2602793 Japanese Patent No. 2996606 Japanese Patent No. 4022205 Japanese Patent No. 2913461

  However, the optimum precast member joining structure should be selected according to the shape of the precast member to be applied, the required proof stress and durability, and various joining structures having various effects. Development is desired.

  Then, this invention aims at providing the joining structure of the precast member excellent in durability which can join precast members with high proof stress.

  In order to achieve the above-mentioned object, the precast member joining structure of the present invention is a joining structure for joining precast members arranged with a gap between them, and a part of the joining side end portions of both precast members is used. The perforated plate is embedded so that at least one hole is disposed in the gap, and in the gap, the holes of the perforated plate protruding from both precast members are viewed in the direction perpendicular to the plane. The pre-stress is introduced into the filling portion of the filler by the PC steel material filled with the filler in the gap and inserted through the holes.

  In addition, another precast member joining structure is a joining structure for joining precast members arranged with a gap between them, and at the joining side end portion of the precast member, a part of the rod-shaped joint embedded therein An insertion hole for accommodating the tip of the rod-shaped joint material is formed in the opposing precast member at the location where the material protrudes, and the insertion hole is opened at one end on the gap side and the other end communicates with the outside. The gap and the insertion hole are filled with a filler.

  Here, it is preferable that a concave portion is formed at the joining side end.

  Further, the precast member is a floor slab in which a rib portion extending in a joining orthogonal direction is provided at least at a joining side end portion, and the perforated plate or the rod-shaped joint material is spaced in the joining orthogonal direction. It can be set as the structure provided by placing a plurality.

Furthermore, the precast member is a cementitious matrix obtained by mixing a composition containing cement, aggregate particles having a maximum particle size of 2.5 mm or less, pozzolanic reaction particles, and a dispersant with water. Compressive strength obtained by mixing 1 to 4% of the fiber with a diameter of 0.1 to 0.3 mm and a length of 10 to 30 mm is 150 N / mm ² or more, bending tensile strength is 15 N / mm ² or more, It can be manufactured by a fiber reinforced cementitious mixed material having a mechanical property of splitting tensile strength of 5 N / mm ² or more.

  The precast member joining structure of the present invention configured in this way is integrated with a filler by protruding a perforated plate partially embedded inside from the joining side end of both precast members, Prestress is introduced into the filling portion by the PC steel material inserted through the hole of the perforated plate.

  For this reason, the precast members are connected to each other through a perforated plate projecting from both joining side end portions, and the perforated plate is tightened by prestress in the filling portion, thereby being firmly joined. Can be structured. Moreover, since the perforated plate and the PC steel material are covered with the filler, it is possible to obtain a bonded structure with excellent durability.

  In addition, another precast member joining structure has a rod-shaped joint material partly embedded inside protruding from the joining side end of one precast member, and the tip is accommodated in the insertion hole of the other precast member. Integrate with filler.

  For this reason, the precast members can be made into a strong joint structure by the rod-shaped joint material and the filler that protrude from both joint side ends. Moreover, since the rod-shaped joint material is covered with the filler, it is possible to obtain a joint structure with excellent durability.

  Furthermore, by forming a recess at the joining end, the filler filled in the gap flows into the recess to form an uneven fitting shape. Can be increased.

  And if it is a precast member in which the rib part is extended in the direction orthogonal to the joint, the thickness other than the rib part can be reduced to reduce the weight, and the joining structure can be easily made by providing the rib part at the joining side end part. Will be able to build.

In addition, the precast member is a cementitious matrix obtained by mixing a composition containing cement, aggregate particles having a maximum particle size of 2.5 mm or less, pozzolanic reaction particles, and a dispersant with water. Compressive strength obtained by mixing 1 to 4% of the total volume of fibers with a diameter of 0.1 to 0.3 mm and length of 10 to 30 mm is 150 N / mm ² or more, bending tensile strength is 15 N / mm ² or more, splitting If it is made of a fiber reinforced cementitious mixed material having a tensile strength of 5 N / mm ² or more, it is possible to construct a precast member joining structure that is lightweight and excellent in durability.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  The joint structure of the precast member of the present embodiment can be applied to the joint of precast floor slabs 1 and 1 laid on a bridge, artificial ground or the like.

  FIG. 2 is a perspective view of the bridge 2 under construction as viewed from below, and FIG. 3 is a perspective view of the bridge 2 during installation of the precast floor slab 1.

  As shown in FIG. 2, the bridge 2 has two bridge girders 21, 21 laid on bridge piers 22, 22 erected at intervals in the bridge axis direction, and straddles the bridge girders 21, 21. A plurality of precast floor slabs 1,.

  Then, the precast floor slabs 1 and 1 are connected to each other by the joint 10 to construct a joint structure. Here, the joining direction of the precast slabs 1 and 1 coincides with the bridge axis direction, and the joining orthogonal direction coincides with the width direction of the bridge 2. In addition, the out-of-plane direction of the precast slab 1 in the joining orthogonal direction is expressed as the vertical direction.

  The precast floor slab 1 is preferably manufactured using an ultra-high strength fiber-reinforced cement-based mixed material.

  This fiber reinforced cementitious mixed material mixes metal fibers into a cementitious matrix obtained by mixing a composition containing cement, aggregate particles, pozzolanic reactive particles, and a dispersant with water. Manufactured.

  Here, an aggregate material such as cinnabar having a maximum particle size of 3.0 mm or less, preferably 2.5 mm or less is used for the aggregate particles. Further, as the pozzolanic reaction particles, those having a particle size of 15 μm or less are used. For example, silica fume or the like is used as a highly active pozzolanic reaction particle having a particle size of 0.01 to 0.5 μm, and fly ash or blast furnace slag is used as a low activity pozzolanic reaction particle having a particle size of 0.1 to 15 μm. To do. These pozzolanic reactive particles having different activities can be mixed or used alone. Further, at least one type of the dispersant is used in order to improve fluidity.

For the metal fiber, for example, a steel fiber having a diameter of about 0.1 to 0.3 mm and a length of about 10 to 30 mm and a tensile yield stress of 2600 to 2800 N / mm ² is used. Further, this steel fiber is mixed in an amount of about 1 to 4% of the total volume of the fiber-reinforced cementitious mixed material to be produced.

The fiber-reinforced cement-based mixed material manufactured with such a composition has a compressive strength of 150 to 200 N / mm ² , a bending tensile strength of 15 to 45 N / mm ² , a split tensile strength of 5 to 25 N / mm ² , and water permeability. The coefficient is 4.0 × 10 ⁻¹⁷ cm / sec, the salt diffusion coefficient is 0.0019 cm ² / year, and the elastic modulus is 50 to 55 GPa.

  And using such a fiber reinforced cementitious mixed material, as shown in FIG. 4, the precast floor slab 1 in which the some rib part (14,15) was extended is manufactured in a factory. Here, when constructing the precast slab 1 with a fiber-reinforced cement-based mixed material, it is usually unnecessary to arrange reinforcing bars.

  The precast floor slab 1 includes a plurality of rib portions (14, 15) extending in a direction orthogonal to the joining, and end ribs 14 provided along the end portions 11, 11 on both sides serving as joining side end portions. , 14 and a plurality of ribs 15,...

  In these rib portions (14, 15), PC steel wires 34,... As PC steel materials are embedded, and prestress is thereby introduced. That is, the PC steel wire 34 is a member that introduces prestress by a pretension method. In a state in which the PC steel wire 34 is tensioned and tensioned, a fiber-reinforced cement-based mixed material is placed around the PC steel wire 34 to obtain a predetermined stress. When the tension of the PC steel wire 34 is released after the strength of the steel has been developed, prestress is applied to the rib portions (14, 15) and the precast floor slab 1 through the fiber-reinforced cement-based mixed material attached around the PC steel wire 34. be introduced.

  Further, as shown in FIG. 1, a concave groove 12 as a concave portion is extended at the end portion 11 of the precast floor slab 1 in the direction orthogonal to the joining. Here, the concave groove 12 is a concave part that is continuous in the direction orthogonal to the joint, but the present invention is not limited to this, and a plurality of rectangular columnar concave parts having a truncated quadrangular pyramid shape or a trapezoidal cross-sectional shape may be scattered. Good.

  Moreover, in this Embodiment, the perforated steel plate 3 as a perforated board is arrange | positioned in the edge part 11 of this precast floor slab 1 at intervals in the joining orthogonal direction.

  As shown in FIG. 1, the perforated steel plate 3 has an embedded portion 3 b embedded in the precast floor slab 1 and a protruding portion 3 a that protrudes from the end portion 11. Here, when the precast floor slab 1 is constructed with a fiber reinforced cementitious mixed material, the adhesion strength with the perforated steel plate 3 is increased, and therefore the area of the embedded portion 3b can be reduced. Further, the perforated steel sheet 3 can be improved in corrosion resistance by being formed of a galvanized steel sheet or the like.

  The projecting portion 3a is provided with a plurality of holes 31, 31 penetrating in the direction perpendicular to the plane, and the embedded portion 3b is also provided with a plurality of holes 32, 32 penetrating in the direction perpendicular to the plane.

  The holes 32 of the embedded portion 3b are arranged so as to substantially coincide with the holes 32 of the other perforated steel plates 3,. The PC steel wire 34 is inserted into the holes 32,... And prestress is introduced. By tightening the embedded portion 3b of the perforated steel sheet 3 with prestress in this way, the shear strength can be increased and the joint strength of the perforated steel sheet 3 can be improved.

  Then, the structure of the joining structure of the precast floor slabs 1 and 1 of this Embodiment is demonstrated, referring FIG. 1 which showed the joining process.

  First, the two precast slabs 1 and 1 to be joined are installed with the gap 13 therebetween so that the end portions 11 and 11 face each other. The gap 13 is set to an interval of 10 to 30 cm, for example.

  At this time, the perforated steel sheet projecting from the end portion 11 of the other precast floor slab 1 is provided between the perforated steel sheet 3 projecting from the end portion 11 of the one precast floor slab 1. 3, ... are arranged.

  And the holes 31,... Of the perforated steel plates 3,... Alternately projecting from the two precast floor slabs 1, 1 are viewed in the direction perpendicular to the plane of the perforated steel plate 3 (the direction perpendicular to the joint). It arrange | positions so that it may correspond with the hole 31, ... of other perforated steel plates 3, ..., and the unbonded PC steel wire 33 as PC steel material is inserted in those holes 31, ... Yes.

  The unbonded PC steel wire 33 is a PC steel material in which the periphery of the PC steel wire is coated with a coating material such as a resin pipe. Even if the unbonded PC steel wire 33 is filled with a filler, the filler is used as a coating material. Since it adheres only and does not adhere to the PC steel wire inside it, it is possible to apply tension by tensioning the PC steel wire after the filler has hardened.

  The gap 13 is filled with, for example, the above-described fiber-reinforced cement-based mixed material as a filler. By using the same material as the precast floor slab 1 for the filler, the joint portion 10 can have the same performance as the precast floor slab 1.

  As the filler, non-shrink mortar or cement paste having fast curing, fluidity, non-shrinkage or expansibility can be used.

  In the portion where the gap 13 is filled with the filler in this way, a filling portion 35 is formed as shown in FIG. The filling portion 35 is formed into a shape having ridges on both sides by filling the grooves 12 and 12 of the precast floor slabs 1 and 1 with the filler.

  And after the intensity | strength of the filler of this filling part 35 reaches predetermined intensity | strength, a prestress is introduce | transduced into the filling part 35 by a post tension system. In this post-tension method, one end of the PC steel wire inside the unbonded PC steel wire 33 is fixed to one end of the filling portion 35 in the joining orthogonal direction, and the other end of the PC steel wire is tensioned with a jack or the like. The prestress is introduced into the filling portion 35 by fixing the other end to the other end portion of the filling portion 35 in a state where the tension is applied to the PC steel wire.

  Next, the effect | action of the joining structure of the precast floor slabs 1 and 1 of this Embodiment is demonstrated.

  The joint structure of the precast floor slabs 1, 1 of the present embodiment configured as described above includes a perforated steel plate 3 provided with an embedded portion 3 b embedded in the precast floor slab 1, and both precast floor slabs 1. , 1 projecting from the joint-side end portions 11, 11 to the gap 13, and the gap 13 is filled with a filler to form a filling portion 35. Further, prestress is introduced into the filling portion 35 by tensioning the unbonded PC steel wire 33 inserted into the hole 31 of the protruding portion 3 a of the perforated steel plate 3.

  For this reason, the precast floor slabs 1 and 1 are connected to each other at the filling portion 35 via the perforated steel plates 3,. Further, since the perforated steel sheets 3,... Are tightened by prestress in the filling portion 35, the bonding strength between the perforated steel sheets 3,. Can be.

  Moreover, since the perforated steel plate 3 and the unbonded PC steel wire 33 are covered with the filler and the precast floor slab 1, a bonded structure with high anticorrosion performance and excellent durability can be obtained.

  Further, by forming the concave groove 12 in the end portion 11 on the joining side, the filling material filled in the gap 13 flows into the concave groove 12, and an uneven fitting structure is formed as a shear key (cotter). For this reason, for example, even if bending in the joining direction (bridge axis direction) occurs in the precast floor slab 1, it is possible to resist the shearing force that shifts the end portion 11 in the vertical direction. Can be increased.

  On the other hand, if it is the shape where this recessed part is dotted with two or more, resistance force can be heightened not only to an up-down direction but to the shear force of a joining orthogonal direction (width direction).

  And if it is the precast floor slab 1 in which a rib part (14, 15) is extended in the joining orthogonal direction, thickness other than a rib part can be made thin and weight reduction can be achieved. Further, by providing the end ribs 14 on the end portion 11 on the joining side, the dimension of the end portion 11 becomes thick and a space for constructing the joining structure is created, so that the joining structure can be easily constructed. Become.

Moreover, the precast floor slab 1 and the filling portion 35 are obtained by mixing a composition containing cement, aggregate particles having a maximum particle size of 2.5 mm or less, pozzolanic reaction particles, and a dispersant with water. a cementitious matrix for a diameter of 0.1 to 0.3 mm, compressive strength obtained by mixing 1-4% of the total volume of the fibers in the form of 10~30mm length of 150 N / mm ² or more, flexural tensile strength 15N / Mm ² or more, if it is made of fiber-reinforced cement-based mixed material with mechanical properties of split tensile strength of 5N / mm ² or more, it is possible to build a joint structure between precast floor slabs 1 and 1 that are lightweight and have excellent durability can do.

  Hereinafter, Example 1 of a form different from the above-described embodiment will be described with reference to FIGS. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  FIG. 5 shows two types of joining structures using rod-shaped joint materials.

  First, in order to explain the joining structure of FIG. 5A, description will be made with reference to the perspective view showing the joining process of FIG.

  In the joining structure of the first embodiment, the reinforcing bar 4 as a rod-shaped joint material is projected from the end portion 11 of the precast floor slab 1. The incision bar 4 has a protruding portion 4 a that protrudes from the end portion 11 and an embedded portion 4 b that is embedded in the precast floor slab 1.

  In this insertion bar 4, the protruding portion 4a is linear, and the embedded portion 4b is tilted upward in accordance with the haunch of the end rib 14, whereby a fixed cover thickness can be secured in the embedded portion 4b. Moreover, anticorrosion performance can be improved by using an epoxy reinforcing bar or a galvanized reinforcing bar.

  Further, the bending resistance can be increased by bending the insertion line 4 in the middle. Furthermore, for the insertion bar 4, adhesion resistance can be increased by using a deformed reinforcing bar having irregularities formed on the peripheral surface. Further, in order to increase the fixing force of the embedded portion 4b, a fixing portion such as a fixing plate, a hook, or a protrusion may be provided at the end portion.

  Moreover, in the location where the incisor bar 4 is projected, an insertion hole 41 for accommodating the tip of the incisor bar 4 in the opposing precast floor slab 1 is formed.

  The insertion hole 41 becomes an insertion port 41a having one end opened to the gap 13 side, and is formed in a cylindrical shape until the tip of the insertion line 4 reaches, and then bent upward to be precast slab 1 An upper surface opening 41b is formed in communication with the upper surface.

  Such insertion bars 4 and insertion holes 41 are alternately provided at the end 11 of the precast floor slab 1, and the other precast floor is opposed to each other at the position where the insertion bars 4 of the one precast floor slab 1 are projected. An insertion hole 41 is provided in the end portion 11 of the plate 1, and a reinforcing bar 4 is provided in the end portion 11 of the other precast floor slab 1 that is opposite to the portion in which the insertion hole 41 of the one precast floor slab 1 is provided. Projected.

  When the gap 13 between the precast floor slabs 1 and 1 facing each other is reduced as shown in FIG. 6, the tip of the insertion bar 4 is inserted into the insertion port 41a of the opposite insertion hole 41, As shown in FIG. 5A, the distal end portion of the insertion bar 4 is accommodated in the insertion hole 41. The gap 13 at this time is set to an interval of 2 to 6 cm, for example.

  The gap 13 is filled with a filler. The filler is filled in the gap 13 and also enters the inside of the insertion hole 41 from the insertion port 41a. Here, since the insertion hole 41 communicates with the outside through the upper surface port 41b, the upper surface port 41b can be an air hole so that the entire insertion hole 41 can be filled. Further, the filling property can be confirmed by the upper surface port 41a.

  On the other hand, the joining structure shown in FIG. 5 (b) is a structure in which flat precast lithographic plates 1A and 1A are joined as a precast member.

  Here, the linear reinforcing bar 5 is used as a rod-shaped joint material. In other words, in this embodiment, the reinforcing bar 5 is not only the protruding portion 5a but also the embedded portion 5b is linear. In addition, about the burying part 5b, instead of making it linear, it can be bent in the middle and inclined upward similarly to the burying part 4b of FIG. By bending upward as described above, the embedded portion 5b is disposed in the bending compression region of the precast lithographic plate 1A, so that the fixing strength of the incisor 5 can be increased and the burden on the bending tension region can be reduced or eliminated. Can do.

  5A, the leading end of the insertion bar 5 is inserted into the insertion hole 51, and the filling portion 52 is formed by filling the gap 13 with the filler.

  The joint structure of the precast floor slabs 1, 1 (1A, 1A) of Example 1 configured as described above has a reinforcing bar 4 (5) partially embedded in one precast floor slab 1 (1A ) Is protruded from the end 11 on the joining side, and the tip is accommodated in the other insertion hole 41 (51) and integrated with the filler.

  For this reason, the precast floor slabs 1, 1 (1A, 1A) can be firmly joined to each other by the reinforcing bars 4 (5) projecting from the end portions 11, 11 on both joining sides and the filler. . Moreover, since the incisor 4 (5) is covered with the filler over the entire length, a joining structure having excellent durability can be obtained.

  In addition, in this Example 1, although the case where the incisor 4 (5) and the insertion hole 41 (51) were alternately provided in the edge part 11 of the precast floor slab 1 was demonstrated, it is not limited to this, One precast floor slab 1 may be provided with only the insertion line 4 (5), and the other precast floor slab 1 may be provided with only the insertion hole 41 (51).

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and a description thereof will be omitted.

  Hereinafter, Example 2 of a form different from the above-described embodiment or Example 1 will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment or Example 1 will be given the same reference numerals.

  In Example 2, a case where an arc-shaped bar joint material is used will be described.

  In the joining structure shown in FIG. 7A, a convex portion 64 is provided at the end portion 11 of one precast floor slab 1, and the convex portion 64 is provided at the end portion 11 of the other precast floor slab 1. A recessed portion 65 having a fitting shape is provided.

  Further, the end ribs 14, 14 of both precast floor slabs 1, 1 are respectively provided with bending holes that form arcuate insertion holes 61 when connected. In addition, a recess that becomes the fixing portion 63 is provided on the upper surface of the precast floor slab 1 that is an end portion of the insertion hole 61.

  When the adhesive 64 is applied to the end portions 11, 11 of both the precast floor slabs 1, 1 and brought into contact with each other to fit the convex portion 64 into the concave portion 65, the insertion hole 61 is communicated. Subsequently, the bending bolt 6 is inserted from one side of the insertion hole 61, and the rear end is fixed to the fixing portion 63 of the one precast floor slab 1 with the nut 62. Instead of the nut 62, a protrusion such as a fixing plate may be provided at the rear end so as to be caught by the fixing unit 63. The bent bolt 6 can be formed of a high-strength bolt, a PC steel rod, or the like.

  Further, when the bending bolt 6 is inserted into the insertion hole 61, the tip protrudes to the fixing portion 63 of the other precast floor slab 1. Therefore, the bending bolt 6 is tightened by tightening the bending bolt 6 at the tip. To settle. The fixing unit 63 may be filled with a filler for the purpose of anticorrosion.

  Thus, if it is the structure which clamp | tightens the bending bolt 6, the prestress of a joining direction will be introduce | transduced into a joining structure, and it can be made strong connection. Further, when the fixing portions 63 and 63 are not filled with a filler, repair such as replacement and retightening of the bending bolt 6 or replacement of the precast floor slab 1 can be easily performed after construction.

  On the other hand, in the joining structure shown in FIG. 7B, the precast floor slabs 1 and 1 are joined together with a gap 74 interposed therebetween. Further, the end ribs 14, 14 of both precast floor slabs 1, 1 are respectively provided with bent holes that form arcuate insertion holes 71 when connected.

  And both the precast floor slabs 1 and 1 are arrange | positioned on both sides of the gap 74 of 2-6 cm, and the bending reinforcement 7 is inserted from one side of the insertion hole 71. Subsequently, the gap 74 and the insertion hole 71 are filled with a filler, and the precast floor slabs 1 and 1 are joined together.

  Thus, if it is the structure which inserts the bending reinforcement 7 and fills with a filler, it can construct | assemble a joining structure easily, and since the bending reinforcement 7 is coat | covered with a filler, it is excellent in durability. Further, since the width of the gap 74 can be narrowed, the amount of filler used can be reduced.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or Example 1, and thus description thereof is omitted.

  Hereinafter, Example 3 of a form different from the above-described embodiment or other examples will be described with reference to FIG. Note that the description of the same or equivalent parts as those described in the embodiment or other examples will be given with the same reference numerals.

  In Example 3, a joint structure between precast lithographic plates 1A and 1A as a precast member will be described.

  In the joining structure shown in FIG. 8A, a reinforcing bar joint 81 is projected from the joining side end of the precast lithographic plate 1A. The reinforcing bar joint 81 is provided at the same position on the opposing precast lithographic plates 1A and 1A.

  When the precast lithographic plates 1A and 1A are opposed to each other with a gap of 20 to 50 cm, the ends of the reinforcing bar joints 81 and 81 arranged at the same position are brought into contact with each other. The tips of the reinforcing bar joints 81 and 81 are joined by a welded portion 81a.

  Subsequently, the unbonded PC steel wires 33 and 33 are arranged between the precast lithographic plates 1A and 1A, and the filling material 81b is formed by filling the filler. This filler is also filled in the recess 81c of the precast lithographic plate 1A to form a shear key.

  Further, after a predetermined strength is developed in the filling portion 81b, the unbonded PC steel wires 33 and 33 are tensioned to introduce prestress in the joining orthogonal direction to the filling portion 81b.

  Moreover, in the joining structure shown in FIG.8 (b), the rebar joint 82 is protrudingly provided in the joining side edge part of 1 A of precast flat plates. This reinforcing bar joint 82 is provided at a position slightly shifted in the joining orthogonal direction between the opposed precast lithographic plates 1A and 1A.

  Then, when the precast lithographic plates 1A and 1A are opposed to each other through a gap of 20 to 30 cm, the vicinity of the tips of the reinforcing bar joints 82 and 82 are wrapped to form a wrap portion 82a.

  Subsequently, the unbonded PC steel wires 33 and 33 are arranged between the precast lithographic plates 1A and 1A, and the filler 82 is filled to form a filling portion 82b. This filler is also filled in the recess 82c of the precast lithographic plate 1A to form a shear key.

  Further, after a predetermined strength is developed in the filling portion 82b, the unbonded PC steel wires 33 and 33 are tensioned to introduce prestress in the joining orthogonal direction to the filling portion 82b.

  Thus, if it is the structure which wraps the reinforcing bar joints 82 and 82, joining efficiency is good and it can be easily absorbed even if there is a construction error.

  Further, in the joining structure shown in FIG. 8C, a loop joint 83 is projected from the joining side end of the precast lithographic plate 1A. Since the loop joint 83 has U-shaped or oval protruding portions, both ends can be fixed to the precast lithographic plate 1A.

  Then, when the precast lithographic plates 1A and 1A are opposed to each other through a gap of 20 to 30 cm, the projecting portions of the loop joints 83 and 83 wrap, and a through hole having an oval side view is formed in the wrap portion 83a. Will be.

  Subsequently, the unbonded PC steel wires 33 and 33 are inserted into the lap portions 83a of the loop joints 83 and 83, and the filling portion 83b is formed by filling the filler. This filler is also filled in the recess 83c of the precast lithographic plate 1A to form a shear key.

  In addition, after a predetermined strength is developed in the filling portion 83b, the unbonded PC steel wires 33 and 33 are tensioned to introduce prestress in the joining orthogonal direction to the filling portion 83b.

  By using the loop joints 83 and 83 in this way, the fixing length of the filling portion 83b can be shortened, so that a strong joint structure can be constructed even if the gap width is narrow.

  In addition, in the joining structure of the precast lithographic plates 1A and 1A described in the third embodiment, the introduction of prestress is achieved by arranging reinforcing bars instead of the unbonded PC steel wires 33 and 33 in the filling portions 81b, 82b, and 83b. Can be omitted.

  Other configurations and operational effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment or example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

  For example, in the said embodiment and Example, although the case where a precast member (1, 1A) and a filler were constructed | assembled with a fiber reinforced cementitious mixed material was demonstrated, it is not limited to this, A precast member (1 , 1A) can be arbitrarily selected by constructing reinforced concrete or prestressed concrete, or using non-shrink mortar as a filler.

  Moreover, in the said embodiment and Example, although the plate-shaped member was demonstrated as a precast member, it is not limited to this, A girder member, a beam member, the segment member of a shield tunnel, etc. are used as a precast member. Can be applied.

It is a perspective view explaining the structure of the joining structure of the precast floor slab of the best embodiment of this invention. It is the perspective view which looked at the bridge which bridges a precast floor slab from the bottom. It is a perspective view explaining the installation work of a precast floor slab. It is sectional drawing explaining the structure of the joining structure of the precast floor slab of the best embodiment of this invention. It is sectional drawing of a structure of the joining structure of two types of precast slabs demonstrated in Example 1. FIG. It is a perspective view explaining the structure of the joining structure of the precast floor slab of Example 1. FIG. It is sectional drawing of the structure of the joining structure of two types of precast slabs demonstrated in Example 2. FIG. It is sectional drawing of the structure of the joining structure of three types of precast slabs demonstrated in Example 3. FIG.

Explanation of symbols

1 Precast floor slab (precast material)
1A Precast lithographic plate (Precast member)
10 joint 11 end (joint side end)
12 concave groove
13 Gap 14 End rib (rib part)
15 Ribs (ribs)
3 Perforated steel plate (perforated plate)
3a Protruding portion 3b Embedded portion 31, 32 Hole 33 Unbonded PC steel wire (PC steel)
34 PC steel wire (PC steel)
35 Filling section 4 and 5 insertion bar (bar joint material)
4a, 5a Protruding part 4b, 5b Buried part 41, 51 Insertion hole 41a, 51a Insertion opening (opening on the gap side)
42,52 filling section

Claims (5)

It is a joining structure for joining precast members arranged with a gap between them,
At the joint side end portions of both precast members, a perforated plate partially embedded inside is projected so that at least one hole is disposed in the gap, and the gap protrudes from both precast members. The holes of the perforated plate are made to substantially coincide with each other when viewed in the direction perpendicular to the plane, and the filler is filled in the gap, and prestress is introduced into the filling portion of the filler by the PC steel material inserted into the holes. A precast member joining structure characterized by: It is a joining structure for joining precast members arranged with a gap between them,
In the joint side end of the precast member, an insertion hole is formed to accommodate the tip of the rod-shaped joint material in the opposing precast member at a location where a part of the bar-shaped joint material embedded inside is projected. One end of the hole is opened to the gap side, and the other end communicates with the outside, and the gap and the insertion hole are filled with a filler.   The joint structure of the precast member according to claim 1, wherein a concave portion is formed in the joining side end portion.   The precast member is a floor slab in which a rib portion extending in a direction perpendicular to the joint is provided at at least a joint side end, and the perforated plate or the bar-shaped joint material is spaced in the direction perpendicular to the joint. 4. The precast member joining structure according to claim 1, wherein a plurality of the precast member joining structures are provided. 5. The precast member has a diameter of a cementitious matrix obtained by mixing a composition containing cement, aggregate particles having a maximum particle size of 2.5 mm or less, pozzolanic reaction particles, and a dispersant with water. but 0.1 to 0.3 mm, compressive strength obtained by mixing 1-4% of the total volume of the fibers in the form of 10~30mm length of 150 N / mm ² or more, flexural tensile strength 15N / mm ² or more, Wari裂tensile The joint structure for precast members according to any one of claims 1 to 4, wherein the joint structure is made of a fiber-reinforced cement-based mixed material having a mechanical property of 5 N / mm ² or more in strength.

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