JP2019112896A - Joint structure and joining method - Google Patents

Abstract

To provide a joint structure and a joining method for a precast floor slab which makes it possible to apply a sufficient tensioning force and also reduce a friction force of tendon so as to improve workability.SOLUTION: Each of a first precast floor slab 10 and a second precast floor slab 20 has end faces 11b, 21b extending in the bridge axial right angle direction D2 and height direction, and insertion holes 11f, 21f extending in a curved manner along the bridge axial right angle direction D2 and into which a tendon 30 is inserted. The end face 11b, 21b and the insertion holes 11f, 21f have irregularities 11c, 21c, 2 extending along the bridge axis right angle direction D2 when viewed from the height direction. When viewed from the height direction, concave portions 11h, 21h of the irregularity 2 of the insertion holes 11f, 21f are formed at the positions of convex portions 11e, 21e of the irregularities 11c, 21c of the end faces 11b, 21b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joining structure and joining method in which precast floor slabs are joined together.

  Conventionally, various things are known as a joining structure and joining method with which precast floor slabs were joined. Patent Document 1 describes a joint structure in which a plurality of concrete floor slabs are joined together. In this joint structure, a flat joint surface is formed between the first precast concrete plate and the second precast concrete plate, and the first precast concrete plate and the second precast concrete plate are formed via the flat joint surface. Concrete plates are in close contact with each other.

  This joint structure is joined from the inside of the second precast concrete plate with the first tendon curved and extending inside the second precast concrete plate from the inside of the first precast concrete plate via the joint surface. And a second tendon extending in a curved manner inside the first precast concrete plate via the surface. By pulling the first tendon and the second tendon, tension is applied to the first precast concrete plate and the second precast concrete plate.

JP, 2016-211202, A

  However, in the joint structure described above, the joint surface between the first precast concrete plate and the second precast concrete plate is flat. Therefore, there is a problem that sufficient tension can not be applied to the first precast concrete version and the second precast concrete version unless the bending degree of the tendon with respect to the joint surface is increased. In addition, when the bending degree of the tendon is large, the frictional force of the tendon against the inner surface of the insertion hole becomes large, and there is a problem that the workability of the work of inserting the tendon is not good.

  An object of the present invention is to provide a joining structure and joining method of a precast floor slab capable of sufficiently applying tension and reducing friction of a tendon to improve workability. .

  The joint structure according to the present invention comprises: a first precast floor slab extending in a bridge axis direction, a bridge axis orthogonal direction orthogonal to the bridge axis direction, and a height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction; A joint structure in which a second precast floor slab is joined to each other, the first precast floor slab and the second precast floor slab both having end surfaces extending in a direction perpendicular to the bridge axis and in the height direction, and the bridge An insertion hole through which a tendon extending in a curvilinear shape is inserted along a direction perpendicular to the axis is inserted, and the end face and the insertion hole have an unevenness extending along the direction perpendicular to the bridge axis when viewed from the height direction When viewed from the height direction, the concavities and convexities of the insertion holes are formed at the positions of the convexities of the concavities and convexities on the end face.

  In this joint structure, both the first precast floor slab and the second precast floor slab have end faces extending in the direction perpendicular to the bridge axis and in the height direction, and the end faces are in close contact with each other to construct a joint structure. The respective end faces of the first precast floor slab and the second precast floor slab are formed with asperities extending along the direction perpendicular to the bridge axis. Therefore, by joining the unevenness of the first precast floor slab and the unevenness of the second precast floor slab by meshing, the rigidity of the joint portion can be increased as compared with the case where the end face is flat. it can. Moreover, when it sees from a height direction, the recessed part of the penetration hole is formed in the position of the convex part of an end surface. As described above, by providing the insertion hole and the end face with unevenness, the first precast floor slab and the second precast floor slab can be obtained even if the bending degree of the tendon inserted into the insertion hole, that is, the bending degree of the insertion hole is small. The precast floor slab can be sufficiently tensioned. Therefore, since the degree of curvature of the tendon can be reduced, the frictional force of the tendon against the inner surface of the insertion hole can be reduced, and the workability of the work of inserting the tendon into the insertion hole can be improved. it can.

  In addition, the joint structure may include a projection that protrudes from the inner surface of the insertion hole and contacts the tendon. In this case, the tendon comes in contact with the projection projecting from the inner surface of the insertion hole. Therefore, the degree of bending of the insertion hole is smaller, and the tension material can contact the projection to provide sufficient tension to the first precast floor plate and the second precast floor plate. And since the curvature degree of a tendon can be made small, the frictional force of a tendon can be reduced more.

  In addition, the insertion hole may have a widening portion that widens toward the end face. In this case, the tendon can be easily inserted into the insertion hole by providing the widening portion that widens toward the end face. Therefore, the workability is further improved. Specifically, the tendon can be inserted into the insertion hole before the first precast floor slab and the second precast floor slab contact each other, and the first precast floor slab and the second precast floor slab The positions of the insertion holes can be prevented from shifting even if the two are brought into contact with each other. Therefore, the work of inserting the tendon into the insertion hole can be performed more efficiently.

  In addition, the insertion hole may be inclined and meandered in both the bridge axial direction and the height direction. In this case, when the tendon is pulled through the insertion hole to pull the tendon, the first precast floor slab and the second precast floor slab can be tightened in both the bridge axial direction and the height direction. Therefore, the height of the second precast floor slab can be adjusted to the height of the first precast floor slab by inserting the tendon and pulling the tendon, and positioning in the height direction can be performed. it can. Therefore, since it is possible to automatically perform tightening in both the bridge axial direction and the height direction by pulling the tendon, the joining operation of the first precast floor plate and the second precast floor plate can be efficiently performed. It can be carried out.

  The joining method according to the present invention comprises: an existing first precast floor extending in a bridge axis direction, a bridge axis orthogonal direction orthogonal to the bridge axis direction, and a height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction. A joining method for joining a second precast floor slab to a plate, the first precast floor slab and the second precast floor slab both having an end face extending in a direction perpendicular to the bridge axis and a height direction, and a bridge axis An insertion hole extending in a curvilinear shape along the perpendicular direction is formed, and an unevenness extending in a direction perpendicular to the bridge axis is formed on the end face, and the insertion hole is a recess which is recessed by the convex portion of the unevenness of the end face And opening the side face of the first precast floor slab, and facing the end face of the second precast floor slab to the end face of the first precast floor slab, inserting the tension material into the opening and inserting Passing the tendon through the hole and pulling the tendon And a step of drawing the second precast slab to Rekyasuto deck, a.

  In this bonding method, a bonded structure is constructed by bringing the end faces of the first precast floor slab and the second precast floor slab into close contact with each other. The respective end faces of the first precast floor slab and the second precast floor slab are formed with asperities extending along the direction perpendicular to the bridge axis. Therefore, by engaging and joining the unevenness of the first precast floor slab and the unevenness of the second precast floor slab, it is possible to increase the rigidity of the joint portion as compared with the case where the end face is flat. . Moreover, when it sees from a height direction, the recessed part of the penetration hole which penetrates a tendon is formed in the position of the convex part of an end surface. As described above, the first precast floor slab and the first precast floor slab and the first through-cast are provided even when the bending degree of the tendon inserted through the insertion hole, that is, the bending degree of the insertion hole is small, by providing the unevenness on both the insertion hole and the end surface. Tension can be sufficiently applied to the 2 precast floor slabs. Therefore, since the degree of curvature of the tendon can be reduced, the frictional force of the tendon against the inner surface of the insertion hole can be reduced, and the workability of the work of inserting the tendon into the insertion hole can be improved. it can. Furthermore, in this bonding method, the insertion hole is opened in the side surface of the existing first precast floor slab, and the tendon is inserted from the opening in the side surface of the first precast floor slab. Accordingly, since the new second precast floor slab can be drawn to the existing first precast floor slab by the tension of the tension material, the work of joining the precast floor slab can be performed more efficiently.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to fully provide tension, the frictional force of a tendon can be reduced and workability | operativity can be improved.

(A) is a top view which shows the junction structure which concerns on 1st Embodiment. (B) is a figure which shows an example of the cross section of a tendon. It is a figure which shows the joining method concerning 1st Embodiment notionally. It is a top view which shows the junction structure which concerns on 2nd Embodiment. It is a top view which shows the junction structure which concerns on 3rd Embodiment. It is a longitudinal cross-sectional view which shows the junction structure which concerns on 4th Embodiment. (A) is a side view which shows the junction structure which concerns on 5th Embodiment. (B) is a top view which shows the junction structure which concerns on 5th Embodiment. (A) is a top view which shows the state which builds the junction structure which concerns on 6th Embodiment. (B) is a top view which shows the junction structure which concerns on 5th Embodiment. (A) is a top view which shows the junction structure which concerns on 7th Embodiment. (B) is a BB sectional view taken on the line of FIG. 8 (a). (C) is CC sectional view taken on the line of FIG. 8 (a). It is a top view which shows the junction structure which concerns on 8th Embodiment. It is a top view which shows the junction structure which concerns on 9th Embodiment. (A) is a top view which shows the joining method of the junction structure which concerns on 10th Embodiment. (B) is a perspective view which shows the state which drops one precast floor slab on the other precast floor slab. (C) is a perspective view which shows the state which mounts the tendon of one precast floor slab on the groove | channel of the other precast floor slab. (D) is a perspective view which shows the state which accommodated the tendon of one precast floor slab in the groove | channel of the other precast floor slab.

  Hereinafter, with reference to the drawings, embodiments of a bonding structure and a bonding method of a precast floor slab according to the present invention will be described. In the description of the drawings, the same or corresponding elements will be denoted by the same reference symbols, and overlapping descriptions will be omitted as appropriate. In addition, the drawings are drawn in a simplified or exaggerated manner for ease of understanding, and the dimensions and the like are not limited to those described in the drawings.

First Embodiment
FIG. 1 (a) is a plan view showing a joint structure 1 of a precast floor slab provided with a first precast floor slab 10 and a second precast floor slab 20. FIG. FIG. 1 (b) is a cross-sectional view showing an example of the tendon 30 to be inserted into the joint structure 1. As shown in FIGS. 1 (a) and 1 (b), the joint structure 1 includes the first precast floor plate 10 and the second precast floor plate 20, and the tendon 30 is inserted through the joint structure 30. The tension is applied to the first precast floor plate 10 and the second precast floor plate 20 by the above.

  For example, the first precast deck 10 and the second precast deck 20 are precast decks that form a road bridge. In the road bridge, a plurality of precast floor slabs P (see FIG. 2) are disposed along the bridge axis direction D1, and a portion of the plurality of precast floor slabs P is divided into a first precast floor slab 10 and a second It is assumed that the precast floor version 20. The first precast deck 10 and the second precast deck 20 are prefabricated at the factory. The prefabricated first precast floor slab 10, the second precast floor slab 20 and the tendons 30 are transported to the site. The direction in which the first precast floor slab 10 and the second precast floor slab 20 are connected to each other coincides with the bridge axial direction D1.

  FIG. 2 is a side view schematically showing a state in which the first precast floor slab 10 and the second precast floor slab 20 are connected. As shown in FIG. 1 (a) and FIG. 2, for example, the first precast floor slab 10 is an existing precast floor slab, and the second precast floor slab 20 is a new precast floor slab. Therefore, the joint structure 1 is constructed by joining the new second precast floor slab 20 to the existing first precast floor slab 10. The first precast floor slab 10 includes a cuboid precast block 11 and a plurality of reinforcement bars 12 extending in the bridge axial direction D1. The second precast floor slab 20 comprises precast blocks 21 and reinforcement bars 22 similar to the precast blocks 11 and reinforcement bars 12.

  The precast block 11 and the precast block 21 constitute, for example, a road surface portion extending in the bridge axis direction D1 and the bridge axis perpendicular direction D2. That is, the upper surface 11a of the precast block 11 and the upper surface 21a of the precast block 21 together constitute a road surface. The precast block 11 and the precast block 21 have a thickness in the height direction D3. The height direction D3 is a direction orthogonal to both the bridge axis direction D1 and the bridge axis orthogonal direction D2, and the bridge axis direction D1 and the bridge axis orthogonal direction D2 are also orthogonal to each other.

  The precast block 11 and the precast block 21 are, for example, portions that form a road bridge, and thus receive a load such as a vehicle. The end face 11b of the precast block 11 located at one end in the bridge axis direction D1 is connected to the end face 21b of the precast block 21 located at one end in the bridge axis direction D1. The end surface 11 b is a surface facing the end surface 21 b in the bridge axial direction D1.

  An unevenness 11c is formed on the end face 11b, and an unevenness 21c engaged with the unevenness 11c is formed on the end face 21b. The height direction (the direction of depression and the direction of protrusion) of the asperities 11c and 21c coincides with the bridge axis direction D1. That is, the unevenness 11c and the unevenness 21c both extend in the bridge axis perpendicular direction D2 while meandering so as to bend in the bridge axis direction D1. The unevenness 11c includes a trapezoidal recess 11d and a protrusion 11e. When viewed from the height direction D3, the recess 11d and the protrusion 11e are alternately arranged along the bridge axis perpendicular direction D2. The asperities 21c also include similar recesses 21d and protrusions 21e. The unevenness 11 c and the unevenness 21 c both extend over the entire height direction D3.

  The precast block 11 is formed with an insertion hole 11f through which the tension material 30 is inserted, and the precast block 21 is formed with an insertion hole 21f through which the tension material 30 is inserted. The insertion hole 11f is open at the end face 11b, and the insertion hole 21f is open at the end face 21b. Further, the insertion hole 11f is also opened to the side surface 11g of the first precast floor slab 10 located at the end of the bridge axis perpendicular direction D2. Each of the insertion hole 11 f and the insertion hole 21 f is formed, for example, by embedding a curvilinear sheath tube. The sheath tube may be made of, for example, an anticorrosion material such as ceramic, fiber reinforced plastic (FRP), stainless steel, or a metal subjected to an anticorrosion treatment. A low friction material such as a fluorocarbon resin may be applied to the inner surface of the sheath tube in order to reduce the friction with the tendon 30.

  The insertion holes 11 f and the insertion holes 21 f are formed, for example, near the center of the height direction D 3 in the first precast floor slab 10 and the second precast floor slab 20. When the first precast floor slab 10 and the second precast floor slab 20 are joined to each other, the insertion holes 11 f and the insertion holes 21 f communicate with each other, and the tendons 30 pass through the insides of the insertion holes 11 f and the insertion holes 21 f. Be done.

  The insertion hole 11 f and the insertion hole 21 f both extend curvilinearly along the bridge axis perpendicular direction D2. The insertion hole 11f is formed with a recess 11h which is recessed in the bridge axial direction D1 when viewed in the height direction D3. Similarly, a recess 21 h is formed also in the insertion hole 21 f. The recess 11 h and the recess 21 h constitute the unevenness 2 extending in the bridge axis perpendicular direction D 2, and the height direction (recessing direction and protruding direction) of the unevenness 2 coincides with the bridge axis direction D 1. That is, the unevenness 2 of the insertion holes 11f and 21f extends in the bridge axis perpendicular direction D2 while meandering so as to bend in the bridge axis direction D1.

  When viewed in the height direction D3, the recess 11h of the insertion hole 11f is formed at the position of the convex portion 11e of the end surface 11b, and the recess 21h of the insertion hole 21f is formed at the position of the protrusion 21e of the end surface 21b. The unevenness 2 of the insertion holes 11 f and 21 f and the unevenness 11 c and 21 c of the end faces 11 b and 21 b are in a relation of opposite phase to each other. That is, asperities 11c and 21c project at the recessed portions of the curved insertion holes 11f and 21f.

  The tendon 30 may be unbonded PC steel. In this case, the tendon 30 includes a PC steel wire 30a in which a plurality of steel wires are twisted, a grease 30b surrounding the PC steel wire 30a, and a sheath 30c accommodating the PC steel wire 30a and the grease 30b. As one example, the sheath 30c is a polyethylene jacket. However, the tension member 30 may be a steel other than the unbonded PC steel. The tendon 30 may be made of aramid fiber or carbon fiber, or may be an after-bond PC steel material that hardens with the passage of time. When the surface of the tension member 30 is made of steel, it is necessary to fill the insertion holes 11f and 21f with anticorrosive grout after inserting the tension member 30 into the insertion holes 11f and 21f. However, if the surface of the tendon 30 is not made of steel, it is possible to dispense with the grout filling described above.

  Next, a bonding method for bonding the first precast floor slab 10 and the second precast floor slab 20 will be described. First, as shown in FIG. 2, in a state where the existing first precast floor slab 10 is already joined to another precast floor slab P, the new second precast floor slab 20 and the tendon 30 are prepared (Step of preparing second precast slab and tendon). At this time, the second precast floor slab 20 and the tendons 30 are transported to the site.

  Next, the end face 21b of the second precast floor slab 20 is made to face the end face 11b of the first precast floor slab 10 by carrying out lifting and lowering (step of facing the end face). At this time, an adhesive or a water blocking material may be applied to at least one of the end face 11 b and the end face 21 b. The adhesive or the water blocking material may be made of resin or may be cement paste. In this case, it is possible to correct the lands on the end face 11b and the end face 21b.

  Then, the end face 21 b of the second precast floor slab 20 is butted against the end face 11 b of the first precast floor slab 10 (step of butting). At this time, the unevenness 11c of the end face 11b and the unevenness 21c of the end face 21b are brought into close contact with each other. After abutting the end face 21b to the end face 11b, the tendon 30 is inserted through the insertion hole 11f of the precast block 11 and the insertion hole 21f of the precast block 21 (step of passing the tendon).

  As a specific example, a messenger cable in which the tension members 30 are connected via a one-pass joint is used as an introduction rope, and the introduction rope is introduced into an insertion hole 11 f opened in the side surface 11 g of the first precast floor slab 10. The introduction rope is introduced from the opening on one side of the first precast floor slab 10 in the direction perpendicular to the bridge axis D2 to the insertion hole 11f, passed through the insertion holes 11f and 21f, and the opening on the other side in the direction perpendicular to the bridge axis D2. Derived from

  Then, the tensioning member 30 is introduced into the insertion holes 11f and 21f by pulling the introduction rope from the other side of the bridge axis perpendicular direction D2, and the tensioning members 30 are inserted in the bridge axis perpendicular direction D2 along the insertion holes 11f and 21f. Pass through. Thereafter, the tension material 30 is pulled to draw the second precast floor plate 20 to the first precast floor plate 10 (drawing step). As described above, after the tension material 30 is pulled to apply tension to the first precast floor plate 10 and the second precast floor plate 20, the joint structure 1 is completed.

  Next, the effects of the bonding structure 1 and the bonding method according to the present embodiment will be described in detail. In the joint structure 1, both the first precast floor slab 10 and the second precast floor slab 20 have the end faces 11b and 21b extending in the bridge axis orthogonal direction D2 and the height direction D3, and the end faces 11b and 21b are in close contact with each other. Bonding structure 1 is built by doing. On the end faces 11b and 21b of the first precast floor slab 10 and the second precast floor slab 20, asperities 11c and 21c extending in the bridge axis perpendicular direction D2 are formed. Therefore, by engaging and joining the unevenness 11 c of the first precast floor slab 10 and the unevenness 21 c of the second precast floor slab 20, the rigidity of the joint portion is obtained as compared with the case where the end face is flat. Can be enhanced.

  Further, when viewed in the height direction D3, the concave portion 11h of the insertion hole 11f is formed at the position of the convex portion 11e of the end surface 11b, and the concave portion 21h of the insertion hole 21f is formed at the position of the convex portion 21e of the end surface 21b. It is done. Thus, by providing the asperities 11c, 21c, 2 on both the insertion holes 11f, 21f and the end faces 11b, 21b, the degree of curvature of the tendon 30 inserted into the insertion holes 11f, 21f, ie, the insertion hole 11f , 21f, the first precast floor plate 10 and the second precast floor plate 20 can be sufficiently tightened. Therefore, since the degree of curvature of the tendon 30 can be reduced, the frictional force of the tendon 30 on the inner surface of the insertion holes 11 f and 21 f can be reduced, and the tendon 30 is inserted into the insertion holes 11 f and 21 f. Work workability can be improved.

  In the bonding method according to the present embodiment, the bonded structure 1 is constructed by bringing the end faces 11b and 21b of the first precast floor slab 10 and the second precast floor slab 20 into close contact with each other. In the joint structure 1, the insertion hole 11f is opened in the side surface 11g of the first precast floor slab 10, and the tension material 30 is inserted into the insertion holes 11f and 21f from the opening of the side surface 11g of the first precast floor slab 10. Insert it. Therefore, since the new second precast floor plate 20 can be drawn to the existing first precast floor plate 10 by pulling the tendon 30, the joining operation of the precast floor plate can be performed more efficiently.

Second Embodiment
Next, a junction structure 31 according to a second embodiment will be described with reference to FIG. In the joint structure 31 according to the second embodiment, the shapes of the asperities of the first precast floor slab 40 and the second precast floor slab 50 are different from those of the asperities 11 c and the asperities 21 c of the first embodiment. In the following description, the description overlapping with that of the first embodiment is appropriately omitted.

  As shown in FIG. 3, an unevenness 41c is formed on the end face 41b of the first precast floor slab 40, and an unevenness 51c engaged with the unevenness 41c is formed on the end face 51b of the second precast floor slab 50. There is. The unevenness 41 c and the unevenness 51 c are trapezoidal as in the first embodiment, but the inclination angle θ of the oblique side is different from the first embodiment. Specifically, in the second embodiment, the inclination angle θ of the oblique sides 41d and 51d of the trapezoidal irregularities 41c and 51c with respect to the direction perpendicular to the bridge axis D2 is about 45 ° in the first embodiment. 45 ° or more and less than 90 °. As described above, in the second embodiment, the inclination angles θ of the oblique sides 41d and 51d with respect to the bridge axis perpendicular direction D2 are steeper than in the first embodiment.

  In the joint structure 31 according to the second embodiment, the recess 11h of the insertion hole 11f is formed at the position of the projection 41e of the end surface 41b, and the recess 21h of the insertion hole 21f is formed at the position of the projection 51e of the end surface 51b. ing. Furthermore, the inclination angle θ of the oblique sides 41d and 51d of the irregularities 41c and 51c with respect to the bridge axis perpendicular direction D2 is 45 ° or more and less than 90 °, for example, larger than the inclination angle θ of the first embodiment. As described above, by making the inclination angles of the oblique sides 41d and 51d steep, it is possible to further reduce the degree of bending of the insertion holes 11f and 21f. Therefore, the frictional force of the tendon 30 with respect to the inner surface of the insertion holes 11 f and 21 f can be further reduced, and the workability of the work of inserting the tendon 30 into the insertion holes 11 f and 21 f can be further enhanced.

  When the inclination angles θ are 45 ° or more and less than 90 ° and the inclination angles of the oblique sides 41d and 51d are made steep, the number of reinforcing bars 12 and 22 can be increased, so the strength of the joint structure 31 can be further enhanced. Can. In the case of the first embodiment in which the inclination angle θ is about 45 °, the force to draw the second precast floor slab 20 to the first precast floor slab 10 is strengthened in comparison with the second embodiment. Can.

Third Embodiment
Subsequently, a junction structure 61 according to a third embodiment will be described with reference to FIG. In the joint structure 61 according to the third embodiment, the shapes of the concavities and convexities of the first precast floor slab 70 and the second precast floor slab 80 are different from those of the above-described embodiments. Sinusoidal undulations 71 c are formed on the end face 71 b of the first precast floor slab 70, and irregularities 81 c meshing with the concavities 71 c are formed on the end face 81 b of the second precast floor slab 80. The recess 11h of the insertion hole 11f is formed at the position of the projection 71e of the end surface 71b, and the recess 21h of the insertion hole 21f is formed at the position of the projection 81e of the end surface 81b.

  As described above, in the joint structure 61 according to the third embodiment, the degree of bending of the tendon 30 inserted through the insertion holes 11 f and 21 f, that is, the degree of curvature of the insertion holes 11 f and 21 f is small, as in the previous embodiments. Also, sufficient tension can be applied to the first precast floor plate 70 and the second precast floor plate 80. Therefore, since the degree of curvature of the tendon 30 can be reduced, the frictional force of the tendon 30 on the inner surface of the insertion holes 11 f and 21 f can be reduced, and the tendon 30 is inserted into the insertion holes 11 f and 21 f. Workability can be improved.

Fourth Embodiment
Next, a junction structure 91 according to a fourth embodiment will be described with reference to FIG. In the joint structure 91, the shapes of the first precast floor slab 100 and the second precast floor slab 110 are different from those of the above-described embodiments. The joint structure 91 includes a height matching portion 95 that matches the height of the second precast floor slab 110 with the first precast floor slab 100. The height matching portion 95 includes a recess 101c recessed from the end surface 101b of the first precast floor slab 100, and a protrusion 111c protruding from the end surface 111b of the second precast floor slab 110 and fitted in the recess 101c. . The recess 101 c and the protrusion 111 c have, for example, a trapezoidal shape, but may have a shape other than the trapezoidal shape, such as a rectangular shape or a hemispherical shape. Further, the arrangement of the concave portion 101c and the convex portion 111c may be reversed, and the first precast floor slab 100 may have a convex portion and the second precast floor slab 110 may have a concave portion.

  As mentioned above, the joining structure 91 which concerns on 4th Embodiment is provided with the height alignment part 95 which matches the height of the 2nd precast floor slab 110 with respect to the 1st precast floor slab 100. As shown in FIG. When the end face 101b of the second precast floor slab 110 is brought into contact with the end face 101b of the first precast floor slab 100 by providing the height matching portion 95 on the end faces 101b and 111b, the first precast floor The height of the second precast floor version 110 relative to the version 100 can be automatically adjusted.

  Therefore, the height alignment of the precast floor slab, which has conventionally been troublesome, can be performed automatically, and the height alignment can be performed smoothly, so that the workability can be further enhanced. The height matching portion 95 may extend entirely in the bridge axis perpendicular direction D2 or may be formed in a part of the bridge axis perpendicular direction D2. Moreover, the number of the height alignment parts 95 may be one or more.

Fifth Embodiment
Subsequently, a junction structure 121 according to a fifth embodiment will be described with reference to FIGS. 6 (a) and 6 (b). In the first precast floor slab 130 and the second precast floor slab 140 of the joint structure 121, the arrangement of the insertion holes 131f and the insertion holes 141f is different from those of the above-described embodiments. For example, in the first embodiment, the insertion holes 11f and 21f extending in the bridge axis perpendicular direction D2 while meandering so that the unevenness 2 bends in the bridge axis direction D1 are described, but in the fifth embodiment, the insertion holes 131f and 141f Extend in a direction perpendicular to the bridge axis D2 while meandering so as to be inclined and bent in both the bridge axial direction D1 and the height direction D3. That is, the insertion holes 131f and 141f meander at an angle with respect to both the bridge axis direction D1 and the height direction D3.

  As described above, in the joint structure 121 according to the fifth embodiment, the insertion holes 131 f and 141 f meander in both the bridge axial direction D1 and the height direction D3 in an inclined manner. Therefore, when the tension material 30 is inserted into the insertion holes 131f and 141f and the tension material 30 is pulled, the second precast floor plate 140 is made to extend in the bridge axial direction D1 and the height direction D3 with respect to the first precast floor plate 130. Can be pulled to both sides of the

  Therefore, the height of the second precast floor slab 140 can be automatically adjusted to the height of the first precast floor slab 130 by inserting the tendon 30 and pulling the tendon 30, and the height direction can be obtained. Positioning to D3 can be performed automatically. Therefore, since the clamping in the bridge axial direction D1 and the height direction D3 can be automatically performed in both directions by pulling the tendon 30, the first precast floor plate 130 and the second precast floor plate 140 are obtained. The bonding operation can be performed more efficiently. In addition, the same effects as in the fourth embodiment can be obtained without using a structure such as the height-matching portion 95 formed of asperities, so the shapes of the first precast floor plate 130 and the second precast floor plate 140 can be obtained. It can be made simpler than the fourth embodiment.

Sixth Embodiment
Next, a junction structure 151 according to a sixth embodiment will be described with reference to FIGS. 7 (a) and 7 (b). In the first precast floor slab 160 and the second precast floor slab 170 of the joint structure 151, the shapes of the insertion holes 161f and the insertion holes 171f are different from those of the above-described embodiments. The insertion hole 161 f has a widening portion 161 g that widens toward the end face 161 b of the first precast floor slab 160. For example, the widening portion 161g widens on the tip end side (the protruding side, the side of the second precast floor slab 170) of the convex portion 161e of the end face 161b. The insertion hole 171 f also has a widening portion 171 g similar to the widening portion 161 g. The widened portions 161g and 171g are, for example, trumpet pipes integrated with the mouths of the insertion holes 161f and 171f, and may be flexible pipes (flexible hoses).

  As shown in FIG. 7A, when the widened portions 161g and 171g are provided, the clearance K is formed between the first precast floor slab 160 and the second precast floor slab 170. The insertion holes 161 f and 171 f can be communicated. Therefore, the tendon 30 can be inserted into the insertion holes 161 f and 171 f before the first precast floor slab 160 and the second precast floor slab 170 are joined to each other. And as shown in Drawing 7 (b), also when the 1st precast floor slab 160 and the 2nd pre cast floor slab 170 are joined mutually, penetration holes 161f and 171f are connected mutually.

  As described above, in the joint structure 151 according to the sixth embodiment, the insertion holes 161 f and 171 f have the widened portions 161 g and 171 g that are widened toward the end faces 161 b and 171 b. Therefore, the tension members 30 can be easily inserted into the insertion holes 161 f and 171 f by providing the wide portions 161 g and 171 g in which the insertion holes 161 f and 171 f expand toward the end surfaces 161 b and 171 b. Therefore, the workability of the work of inserting the tendon 30 is further improved.

  Specifically, the tendon 30 can be inserted through the insertion holes 161 f and 171 f before the first precast floor slab 160 and the second precast floor slab 170 contact each other, and the first precast floor slab 160 The communication state can be maintained so that the positions of the insertion holes 161 f and 171 f do not shift even if the second precast floor slabs 170 are brought into contact with each other. Therefore, the work of inserting the tendon 30 into the insertion holes 161 f and 171 f can be performed more efficiently.

Seventh Embodiment
Subsequently, a junction structure 181 according to a seventh embodiment will be described with reference to FIGS. 8 (a) and 8 (b). FIG. 8A is a plan view showing the first precast floor plate 190 and the second precast floor plate 200 of the joint structure 181. As shown in FIG. FIG.8 (b) is a BB sectional drawing of FIG. 8 (a). FIG.8 (c) is CC sectional view taken on the line of FIG. 8 (a). The first precast floor slab 190 has a projection 191g projecting from the inner surface of the insertion hole 191f, and the second precast floor slab 200 has a projection 201g projecting from the inner surface of the insertion hole 201f.

  The protrusions 191g and 201g are formed, for example, by filling the inner surface of the flat pipe constituting the insertion holes 191f and 201f with the protrusions. In this case, a flat pipe having a projection which is crushed from the outside and protrudes inward is buried to form the projections 191g and 201g. The shapes of the protrusions 191g and 201g are, for example, semicircular, but may be trapezoidal or triangular, and can be changed as appropriate.

  The insertion holes 191f and 201f are both elongated in the bridge axis direction D1. A portion of the insertion hole 191 f facing the protrusion 191 g is a recess 191 h which is recessed with respect to the protrusion 191 g. The recess 191 h is formed at the position of the protrusion 191 e on the end surface 191 b of the first precast floor slab 190. Similarly, the insertion hole 201 f also has a recess 201 h, and the recess 201 h is formed at the position of the protrusion 201 e of the end face 201 b of the second precast floor slab 200.

  As shown in FIGS. 8B and 8C, the projection 191g of the first precast floor slab 190 protrudes from the inner surface of the insertion hole 191f to one side in the bridge axial direction D1, and the second precast floor slab The projection 201g of 200 protrudes from the inner surface of the insertion hole 201f to the other side in the bridge axial direction D1. Accordingly, the tendencies 30 inserted into the insertion holes 191f and 201f contact the protrusions 191g and 201g and meander while bending in the bridge axial direction D1. The tendon 30 passes straight along the direction perpendicular to the bridge axis D2 at locations other than the protrusions 191g and 201g of the insertion holes 191f and 201f.

  As described above, the bonding structure 181 according to the seventh embodiment includes the protrusions 191 g and 201 g that protrude from the inner surfaces of the insertion holes 191 f and 201 f and contact the tendon 30. As a result, the tendon 30 comes in contact with the projections 191g and 201g protruding from the inner surfaces of the insertion holes 191f and 201f. Therefore, even if the degree of curvature of the insertion holes 191f and 201f is smaller and the insertion holes 191f and 201f extend substantially linearly along the bridge axis perpendicular direction D2, the first precast floor slab 190 and the first precast floor slab 190 and the first Sufficient tension can be applied to the second precast floor slab 200. And the frictional force of the tendon 30 can be reduced more.

Eighth Embodiment
Next, a junction structure 211 according to an eighth embodiment will be described with reference to FIG. As shown in FIG. 9, in the first precast floor slab 220 and the second precast floor slab 230 of the joint structure 211, the shape of the protrusion 221g protruding from the inner surface of the insertion hole 221f and the inner surface of the insertion hole 231f The shape of the protrusion 231g is different from that of the seventh embodiment.

  The portion of the insertion hole 221 f facing the protrusion 221 g is a recess 221 h recessed with respect to the protrusion 221 g, and the recess 221 h is formed at the position of the protrusion 221 e of the end face 221 b. Similarly, the insertion hole 231f also has a recess 231h, and the recess 231h is formed at the position of the protrusion 231e on the end surface 231b. In the insertion hole 221f, the protrusion 221g linearly extends along the bridge axis perpendicular direction D2. Similarly, in the insertion hole 231f, the protrusion 231g extends linearly along the bridge axis perpendicular direction D2.

  As described above, in the joint structure 211 according to the eighth embodiment, the projections 221g and 231g that protrude from the inner surfaces of the insertion holes 221f and 231f and contact the tendon 30 are provided. Therefore, as in the seventh embodiment, even if the insertion holes 221f and 231f extend substantially linearly along the bridge axis perpendicular direction D2, the first precast floor plate 220 and the second precast floor plate 220 230 can be given sufficient tension. Therefore, tension can be reliably applied while reducing the frictional force of the tendon 30.

The ninth embodiment
Subsequently, a junction structure 241 according to a ninth embodiment will be described with reference to FIG. As shown in FIG. 10, in the first precast floor plate 250 and the second precast floor plate 260 of the joint structure 241, the shape of the protrusion 251g protruding from the inner surface of the insertion hole 251f and the inner surface of the insertion hole 261f The shape of the protrusion 261g is different from that of the eighth embodiment. As described above, in the eighth embodiment, the protrusions 221g and 231g linearly extend, but in the ninth embodiment, the protrusions 251g and 261g are intermittently provided in the insertion holes 251f and 261f.

  Specifically, the protrusions 251 g are provided at a position facing the concave portion 251 h of the insertion hole 251 f and in a pair on the inner side of the end surface 251 b of the first precast floor slab 250. In other words, the protrusions 251 g are provided in a pair at each end of each insertion hole 251 f of the first precast floor slab 250. Similar to the protrusion 251g, the protrusion 261g is provided in a pair at the opposing position of the recess 261h and inside the end surface 261b of the second precast floor slab 260, and provided in a pair at each end of each insertion hole 261f There is.

  In the ninth embodiment, for example, a balloon-shaped air bag mold is used to form an insertion hole 251 f having a protrusion 251 g and an insertion hole 261 f having a protrusion 261 g. Specifically, the air bag formwork is inflated to construct the shape of the insertion holes 251f and 261f between the two protrusions 251g and 261g, and the air of the air bag formwork is removed at the time of mold removal after concrete placement and the protrusions 251g. Remove the air bag formwork from the portion narrowed by 261 g. As described above, by forming the insertion holes 251 f and 261 f using the airbag mold, the insertion holes 251 f and 261 f having the pair of protrusions 251 g and 261 g can be easily formed.

  Further, in the ninth embodiment, since the protrusions 251g and 261g are formed in the insertion holes 251f and 261f, the insertion holes 251f and 261f substantially extend in the direction perpendicular to the bridge axis D2, as in the seventh and eighth embodiments. Even if extending along a straight line, sufficient tension can be applied to the first precast floor plate 250 and the second precast floor plate 260. Therefore, tension can be reliably applied while reducing the frictional force of the tendon 30.

Tenth Embodiment
A connection structure and a connection method according to the tenth embodiment will be described with reference to FIGS. 11 (a) to 11 (d). In the connection structure according to the tenth embodiment, before being connected to each other, the second precast floor plate 280 has an insertion hole 281 f through which the tension material 30 is inserted, and the first precast floor plate 270 is a tension material 30. Is inserted into the groove 271f. The groove 271 f is formed with a recess 271 g which is recessed in the bridge axis direction D 1. The recess 271 g of the groove 271 f is formed at the position of the protrusion 271 e of the end surface 271 b of the first precast floor slab 270.

  Next, a connection method according to the tenth embodiment will be described. First, the tendon 30 is inserted into the insertion hole 281f of the second precast floor slab 280, and the second precast floor slab 280 is suspended as shown in FIG. 11 (b). At this time, as shown in FIGS. 11 (c) and 11 (d), the tendons 30 exposed between the two convex portions 281e of the second precast floor plate 280 are respectively made of the first precast floor plate 270. From above in the groove 271f of the Thereafter, the grooves 271 f and the tendons 30 are filled with concrete or the like to complete the bonding of the first precast floor plate 270 and the second precast floor plate 280.

  As described above, in the connection method according to the tenth embodiment, the tendon 30 of the second precast floor slab 280 is inserted into the groove 271 f of the first precast floor slab 270 from above, and thereafter, the groove 271 f and the tendon 30 are made of concrete The filling operation can be completed by filling in with, etc. Therefore, the operation of joining the second precast floor slab 280 to the first precast floor slab 270 can be easily performed. The second precast floor slab 280 may have a groove, and the first precast floor slab 270 may have the insertion hole and the tendon 30.

  As mentioned above, although each embodiment of the joining structure and joining method of the precast floor slab which concerns on this invention was described, this invention is not limited to each embodiment mentioned above, The summary described in each claim is changed You may deform | transform in the range which is not. That is, the shape, size, material, and arrangement of each part of the bonding structure, and the contents and order of each step of the bonding method can be changed as appropriate. Moreover, the joining structure and joining method according to the present invention may be a combination of a plurality of modes among the first precast floor slab and the second pre cast floor slab of the first to tenth embodiments.

1, 31, 61, 91, 121, 151, 181, 211, 241 ... junction structure, 10, 40, 70, 100, 130, 160, 190, 220, 250, 270 ... first precast floor slab, 11, 21: Precast block, 11a, 21a: top surface, 11b, 21b, 41b, 71b, 81b, 101b, 111b, 171b, 191b, 191b, 201b, 221b, 251b, 261b, 271b: end surface, 2, 11c, 21c , 41c, 51c, 71c, 81c, ..., concavities, 11d, 21d, ... recessed portions, 11e, 21e, 41e, 51e, 71e, 81e, 161e, 191e, 201e, 221e, 271e, 281e, ... convex portions, 11f, 21f, 131f, 141f, 161f, 171f, 191f, 201f, 201f, 221 , 231f, 251f, 261f, 281f ... insertion hole, 11g ... side surface, 11h, 21h ... recessed portion 12, 22 ... reinforcement bar, 20, 50, 80, 110, 140, 170, 200, 230, 260, 280 ... 2 precast floor slabs, 30 ... tension material, 30a ... PC steel wire, 30b ... grease, 30c ... sheath, 31 ... joint structure, 41d, 51d ... oblique side, 95 ... height matching section, 161g, 171g ... widening section, 191g, 201g, 221g, 231g, 251g, 261g ... projection, 191h, 201h, 221h, 231h, 251h, 261h ... recess, 271f ... groove, 271g ... recess, D1 ... direction of bridge axis, D2 ... direction perpendicular to bridge axis, D3 ... height direction, K ... clearance, θ ... inclination angle.

Claims (5)

The first precast floor slab and the second precast floor which extend in the bridge axis direction, the bridge axis perpendicular direction orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis perpendicular direction. A joint structure in which the plate and the plate are joined to each other,
Both the first precast floor slab and the second precast floor slab have end surfaces extending in the direction perpendicular to the bridge axis and the height direction, and tendons extending in a curved shape along the direction perpendicular to the bridge axis. And an insertion hole to be inserted;
The end face and the insertion hole are formed with asperities extending along the direction perpendicular to the bridge axis when viewed from the height direction,
When viewed from the height direction, the concavities and convexities of the insertion hole are formed at positions of the concavities and convexities of the concavities and convexities on the end face,
Junction structure. A projection which protrudes from the inner surface of the insertion hole and contacts the tendon;
The joint structure according to claim 1. The insertion hole has a widening portion which widens toward the end face,
The joint structure according to claim 1. The insertion hole meanders obliquely in both the bridge axial direction and the height direction.
The junction structure according to any one of claims 1 to 3. A second precast floor slab is provided which extends in a direction of the bridge axis, a direction perpendicular to the bridge axis orthogonal to the direction of the bridge axis, and a height direction orthogonal to both the direction of the bridge axis and the direction orthogonal to the bridge axis. A bonding method for bonding a precast floor slab,
Both the first precast floor slab and the second precast floor slab have end surfaces extending in the direction perpendicular to the bridge axis and the height direction, and insertion holes extending in a curved shape along the direction perpendicular to the bridge axis. And have
The end face is formed with an unevenness extending along a direction perpendicular to the bridge axis,
The insertion hole has a recess which is recessed by the convex portion of the unevenness of the end face, and is opened to the side surface of the first precast floor slab,
Causing the end face of the second precast floor slab to face the end face of the first precast floor slab;
Inserting a tendon into the opening and passing the tendon through the insertion hole;
Pulling the tendon to draw the second precast deck to the first precast deck;
Bonding method.

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