JP5666258B2 - Concrete plate for paving - Google Patents

Description

  The present invention relates to a pavement concrete plate used for constructing a pavement. More specifically, the pavement is constructed such that a pavement portion having excellent durability can be constructed by being connected to each other via a connecting rebar and laid on the roadbed, and can be easily and reliably connected to each other. It relates to concrete plates for use.

  The thing of patent document 1 is proposed as an example of the pavement structure constructed | assembled by mutually connecting through a linear connection reinforcement and laying on a roadbed. The paving concrete slab b used for constructing the pavement structure a extends in the facing direction e of the opposing connecting end faces c and d and opens at the connecting end faces c and d, as shown in FIG. A long circular hole-like long connecting hole f and a short circular hole-like short connecting hole g are provided concentrically, and the back end side of the long connecting hole f and the rear of the short connecting hole g are provided. Longitudinal holes j, j that open at the plate upper surface h are provided continuously on each of the end sides.

  When constructing the pavement structure a (FIG. 29C) using the concrete plate b for paving, the connecting rebar k is horizontally inserted so as to be crotched into the long connecting hole f and the short connecting hole g. In order to achieve the state, first, as shown in FIG. 29 (A), the connecting rebar k is previously accommodated in the long connecting hole f over its entire length. Thereafter, the connecting end faces c and d are brought into contact with each other via the packing material m so that the long connecting hole f and the short connecting hole g are in communication with each other. After that, the connecting bar is pulled by pulling the string member n by engaging the tip p of the string member n that has passed through the short connecting hole g with the tip r of the connecting bar k by means r such as magnetic adsorption. k is moved in a horizontal state toward the back end s of the short connection hole g, and approximately half of the length of the connection rebar k is inserted into the short connection hole g as shown in FIG. It was something to do. Then, after the connecting rebar k is horizontally inserted into the long connecting hole f and the short connecting hole g, as shown in FIG. 29 (C), the connecting holes f, g was filled with a filler t.

  Thus, when connecting the concrete slabs b, b, the connecting rebar k accommodated in the long connecting hole f can be smoothly moved to the short connecting hole g side by pulling the string material n. It must be possible. For this purpose, it is necessary to match the opening end u of the long connection hole f with the opening end v of the short connection hole g with high accuracy. If, for example, as shown in FIG. 30, a step w occurs at the joint portion of the opening ends u and v due to a construction error when the concrete plate b is laid, the tip portion x in the moving direction of the connecting rebar k is changed. At the step w, the problem of poor workability that makes it difficult or impossible to move the connecting rebar k occurred.

  Further, even if the connecting reinforcing bar k can be inserted into the long connecting hole f and the short connecting hole g, the connecting reinforcing bar k has a lower end y caused by gravity as shown in FIG. 29 (B). Since it is placed in a line contact state on the hole bottom z, the cured product a1 of the filler is filled with the filler t in the long connecting hole f and the short connecting hole g as described above. As shown in FIG. 31, the lower layer y side has to be a thin layer portion b1.

  By the way, the purpose of connecting the concrete plates to each other using the connecting rebar k is that the load of the connecting rebar k is used to transfer the automobile load (mainly, traveling of a large truck, etc.) Load distribution by effectively transmitting the heavy traffic load from one connected concrete slab to the other concrete slab, thereby stabilizing the joint part c1 between the concrete slabs and improving the durability of the pavement It was intended to improve. However, when the thin layer part b1 is formed as described above, the thin layer part b1 is easily peeled off from the connecting rebar k due to repeated load applied to the connecting part c1 as the automobile travels, Since the cured filler is gradually destroyed, the load transmission force of the connecting reinforcing bar k gradually decreases. In addition, when the destruction of the hardened filler material progresses in this way, water enters the connecting portion c1 between the concrete plates b and b and causes corrosion of the connecting rebar k. As a result, the load transmission force was reduced. Furthermore, a step is likely to occur in the connecting portion c1 due to such a decrease in load transmission force, which not only deteriorates the running performance of the automobile, but also stress is likely to concentrate on the connecting portion b1 due to the step, There was a problem that the hardened material a1 of the filler was more easily destroyed.

  Thus, in the pavement structure a of the concrete plate for paving according to Patent Document 1, there were two problems of poor workability and poor durability of the connecting portion. Among these, the thing of patent document 2 is proposed as a concrete plate b for paving which improves a workability defect. As shown in FIG. 32 (A), the paving concrete slab b has a long long connecting hole f that opens at the connecting end faces c and d facing each other and extends in the facing direction e in the same manner as described above. A short connecting hole g having a short length is provided. The long connecting hole f is formed as a horizontal hole, and the short connecting hole g is enlarged from the back end side d1 toward the connecting end surface d. It was formed as a tapered hole. Then, the connecting rebar k is horizontally inserted so as to crotch into the long connecting hole f and the short connecting hole g. Prior to the mutual connection of the concrete plates for paving b, b, The reinforcing bar k is accommodated in the long connection hole f over the entire length. Thereafter, the connecting reinforcing bar k is moved toward the back end d1 of the short connecting hole g. At this time, the other end of the tension member g1 having one end f1 connected to the end e1 of the connecting reinforcing bar k. By pulling the side h1 upward at the contact portion j1 of the connection end faces c and d and pulling the tension member g1, the connection reinforcing bar k is connected to the short connection hole g as shown by an arrow in FIG. As shown in FIG. 32 (B), when the leading end k1 of the connecting reinforcing bar k reaches the inner end m1 of the short connecting hole g, the connecting reinforcing bar k is connected to both ends. The holes were inserted horizontally into the holes f and g.

  This movement is performed such that the tip k1 in the moving direction of the connecting rebar k is guided by the inner peripheral lower surface n1 (FIG. 32A) of the tapered hole. For this reason, even if there is a step at the connecting portion between the opening end of the long connecting hole f and the opening end of the short connecting hole g, the connecting reinforcing bar k can be inserted into the short connecting hole g without difficulty. . Thus, when it is based on patent document 2, since it was easy to insert the connection reinforcing bar k, there existed an advantage which can solve the problem of the said workability defect in patent document 1. FIG.

  However, the above-described problem relating to the poor durability of the connecting portion has not been solved. This will be described. As shown in FIG. 32 (B), the paved portion a according to Patent Document 2 has a tip k1 reaching the inner end m1 of the short connecting hole g, and the connecting rebar k is connected to the long connecting hole f and the short connecting hole g. In the state of being inserted horizontally, a filler such as a grout material is inserted from the vertical hole j provided on the back end side of the long connection hole f or the vertical hole j provided on the back end side of the short connection hole g. The gap p1 between the two connecting holes f and g and the connecting reinforcing bar k was filled with the filler t. By filling the filler t in this way, on the short connecting hole g side, a state where the connecting rebar k is wound with the filler t over the entire circumference is obtained, but the long connecting hole f On the side, as in FIG. 31, as in the case of Patent Document 1, a thin layer portion b1 of the filler was formed on the lower end side of the connecting reinforcing bar k.

  Since the connecting reinforcing bar k is wound around the entire circumference of the short connecting hole g with the filler t, the hardened filler as pointed out in connection with Patent Document 1 is provided on the short connecting hole g side. Seems to have solved the problem of destroying. However, since the same phenomenon as described above occurs on the long connecting hole f side of the connecting portion of both concrete slabs b, b and the hardened material a1 of the filler is destroyed, this destruction is caused on the short connecting hole g side. Propagation tends to easily cause destruction of the cured product a1 at the connecting portion. Therefore, the load transmission function expected of the connecting reinforcing bars is not exhibited, the load transmission from one bonded concrete plate to the other concrete plate is poor, and the above-mentioned problem regarding the poor durability of the connecting portion is still solved. There was no.

  By the way, as a pavement structure of a concrete plate for pavement considered to be improved in the load transmission force of the connecting reinforcing bars k, there is the one shown in FIG. The pavement concrete plate b used in the pavement structure a shown in FIG. 4 has a length that opens in the facing connection end faces c and d and extends in the facing direction e as shown in FIG. A long long connecting hole f and a short short connecting hole g are provided, and the diameters of the long connecting hole f and the short connecting hole g are larger than the diameter of the connecting reinforcing bar k. The connecting rebar k is in a floating state in the long connecting hole f and the short connecting hole g, and is filled from the vertical holes j and j connected to the long connecting hole f and the short connecting hole g. A state in which the filler covers the connecting rebar k over the entire circumference is shown. From this point, it seems that the load transmission force of the connecting reinforcing bar k is improved.

  However, a specific means of how to support the linear connecting rebar k in a floating state in the long connecting hole f and the short connecting hole g is completely described in Patent Document 3. There is no description suggesting this. It is not unthinkable to support them by interposing some spacers or to suspend the connecting rebars, but these must be work in an invisible state, both of which are simple and reliable. It is hard to say that it is a construction method. Even if it can be constructed, it has been necessary to perform such construction on all the connecting reinforcing bars, and there is a problem that a pavement structure with uniform quality cannot be constructed. Therefore, it is understood that the pavement structure described in Patent Document 3 cannot be implemented or is difficult to implement.

Japanese Patent Laid-Open No. 11-117233 JP 2009-197561 A No. 3-15605

  The present invention has been developed in view of the above-described conventional problems, and can be easily and reliably interconnected by connecting reinforcing bars to improve the workability of pavement construction and has excellent durability. An object of the present invention is to provide a concrete plate for paving that can construct a paved portion.

In order to solve the above problems, the present invention employs the following means.
That is, a first aspect of a concrete plate for paving (hereinafter referred to as a concrete plate) according to the present invention is a concrete plate for paving that constructs a paving portion by connecting them together and laying on a roadbed. A long connecting hole having a long length and a short connecting hole having a short length that are open at the connecting end surface and extend in the facing direction are provided in a facing state, and the long connecting hole is formed in the back side hole. An enlarged hole portion that expands toward the connection end surface is provided continuously, the bottom of the back side hole portion of the long connection hole has a horizontal straight line shape, and a plate is provided on the back end side of the long connection hole and the short connection hole. A vertical hole opened on the upper surface is provided continuously, and the short connection hole is an enlarged hole portion in which at least a hole portion on the connection end surface side expands toward the connection end surface. Then, the long connecting hole and the short connecting hole are communicated with each other so that the connecting end faces are brought into contact with each other directly or with a packing material interposed therebetween so that the long connecting hole and the short connecting hole are crotched. In addition, in a state where the linear connecting reinforcing bar having a round shaft shape is inserted in a horizontal state, the filler is filled from any one of the vertical holes, so that the expanded hole portion in communication exists, The connecting reinforcing bars are covered with a filler over the entire circumference. In addition, the length of the long connecting hole is set to a length that can accommodate at least the entire length of the connecting reinforcing bar, and the connecting reinforcing bar is a horizontal bottom portion of the back hole portion of the long connecting hole. The enlarged hole portion of the short connecting hole is supported in a horizontal state, and the connecting rebar inserted in the long connecting hole is in a horizontal state toward the back end side of the short connecting hole. It is characterized by having an inclined guide surface that is inclined downward toward the connection end surface, which can guide the tip of the connection rebar in the moving direction when being moved to the position.

  According to a second aspect of the concrete plate of the present invention, in the concrete plate, the short connection hole is continuously provided with an enlarged hole portion that expands toward the connection end surface in a back side hole portion whose bottom portion has a horizontal linear shape. The enlarged hole portion is configured to move the connecting rebar when the connecting rebar inserted in the long connecting hole is moved horizontally toward the back end side of the short connecting hole. It is preferable to have an inclined guide surface that can guide the distal end portion in the direction and incline downward toward the connecting end surface.

  In the first and second concrete slabs, an exhaust groove having a groove shape recessed upward is provided in an upper portion of the short connection hole, and the exhaust groove communicates with the vertical hole. It is preferable to provide an opening at the connection end surface and to extend linearly in the axial direction of the short connection hole.

  In the first and second concrete slabs, an exhaust groove having a groove shape recessed upward is provided in an upper portion of the long connection hole, and the exhaust groove communicates with the vertical hole. It is preferable to provide an opening at the connecting end face and to extend linearly in the axial direction of the long connecting hole.

The present invention has the following excellent effects.
The concrete plate according to the present invention is provided with a long connecting hole having a long length and a short connecting hole having a short length that are open at opposing connecting end faces and extend in the facing direction. The hole is provided with an enlarged hole portion that expands toward the connection end surface at the back side hole portion, and a bottom portion of the back side hole portion of the long connection hole has a horizontal straight line, and the long connection hole and the A longitudinal hole that opens on the upper surface of the plate is connected to the back end side of the short connection hole, and at least the hole portion on the connection end surface side of the short connection hole expands toward the connection end surface. It is an enlarged hole. Therefore, according to the present invention,

(1) Move the linear connecting rebar inserted in the long connecting hole toward the back end side of the short connecting hole, and insert it horizontally into the long connecting hole and the short connecting hole. At this time, even if there is a shift in the connecting portion between the opening end of the long connecting hole and the opening end of the short connecting hole due to construction error, the tip end portion in the moving direction of the connecting reinforcing bar is smoothly guided by the inclined guide surface. Therefore, the connecting rebar can be moved in a horizontal state toward the back end side of the short connecting hole. For this reason, it is possible to easily and efficiently perform the connecting work between the concrete plates using the connecting reinforcing bars.

(2) Then, in a state where the linear connecting rebar is inserted horizontally so as to be crotched into the long connecting hole and the short connecting hole, the vertical hole is filled with a filler such as grout, thereby communicating with each other. In the portion where the enlarged hole portion exists, the connecting rebar can be covered with the filler over the entire circumference. For this reason, it is possible to effectively distribute the load of the automobile traveling on the constructed pavement from one connected concrete plate to the other concrete plate, thereby achieving load distribution. As a result, the load transmission function at the connecting portion of the concrete plate is stably ensured over a long period of time, and a pavement having excellent durability can be constructed.

(3) When an exhaust groove having a groove shape recessed upward is provided in the upper part of the short connection hole or the upper part of the long connection hole so as to communicate with the vertical hole and open at the connection end face, When filling the filler from the hole, the air in the long connection hole and the short connection hole can be smoothly exhausted from the vertical hole sequentially through the exhaust groove, so that the filling operation of the filler can be performed smoothly. .

(4) When the short connection hole is configured as a back hole whose bottom part is in a horizontal straight line with an enlarged hole part, the connecting rebar has left and right deep hole parts in a horizontal straight line shape. Therefore, the state where the connecting reinforcing bar is crotched between the long connecting hole and the short connecting hole can be further stabilized.

It is a top view which shows the state which comprised the pavement part by connecting and laying concrete plates which concern on this invention. It is the perspective view which looked at the concrete plate from the long connecting hole side. It is the perspective view which looked at the concrete plate from the short connection hole side. It is a top view which shows a concrete plate. It is the fragmentary sectional view. It is a fragmentary perspective view which shows the long connection hole side. It is a fragmentary perspective view which shows the short connection hole side. It is a perspective view which shows the other aspect of a long connection hole and a short connection hole. It is the top view and side view which show the concrete plate applied as a non-watering type snow melting panel. It is sectional drawing which shows the state which accommodated the connection reinforcement in the long connection hole. It is sectional drawing which shows the state which made the long connection hole and the short connection hole communicated in the state. It is sectional drawing which shows the state which has pushed the connection reinforcement toward the short connection hole side with the pressing tool. It is sectional drawing which shows the state which inserted the connection reinforcing bar so that it might crotch into a long connection hole and a short connection hole. It is sectional drawing which shows the state from which the opening end of the long connection hole and the short connection hole shifted by the construction error. It is sectional drawing which shows the state which carried out the scooping movement of the connection reinforcement accommodated in the long connection hole toward the short connection hole with the pushing tool. It is sectional drawing which shows the state which has moved the connection reinforcement further toward the short connection hole. It is sectional drawing which shows the state which accommodated the connection reinforcing bar so that it might crotch into a long connection hole and a short connection hole. It is sectional drawing which shows the state which filled grout from the vertical hole of the long connection hole in the state which inserted the connection reinforcing bar in this way. It is sectional drawing which shows the state by which the connection reinforcement was coat | covered with the hardening filler in the connection part between concrete plates. It is a perspective view which shows the long connection hole provided with the exhaust groove. It is sectional drawing which shows the state with which the filler was filled from the vertical hole of the short connection hole in the state inserted in the horizontal state so that a connection reinforcing bar might be crotch into a long connection hole and a short connection hole. It is sectional drawing which shows the other Example of the concrete plate which concerns on this invention. It is sectional drawing which shows the other Example of the concrete plate which concerns on this invention. It is sectional drawing which shows the other Example of the concrete plate which concerns on this invention. It is sectional drawing which shows the other Example of the concrete plate which concerns on this invention. It is sectional drawing which shows the other Example of the concrete plate which concerns on this invention. It is sectional drawing which shows the other aspect of a vertical hole. It is sectional drawing which shows the other aspect of a vertical hole. It is sectional drawing explaining the conventional pavement structure which connects the concrete plates for pavements using a connection reinforcing bar. It is sectional drawing explaining the problem of the conventional pavement structure. It is sectional drawing explaining the problem of the conventional pavement structure. It is sectional drawing explaining the other conventional pavement structure which connects the concrete plates for pavements using a connection reinforcing bar. It is sectional drawing which shows the other conventional pavement structure which connects the concrete plates for pavements using a connection reinforcing bar.

  In FIG. 1, a concrete plate 1 according to the present invention is used to construct a pavement portion 5 having one lane on one side by being connected to each other via a connecting rebar 2 and laid on a roadbed 3. It is suitable for use in the construction of pavements such as highways and automobile roads that require durability over a long period of time. In FIG. 1, the arrows indicate the traveling direction of the automobile.

  More specifically, as shown in FIGS. 2 to 7, the concrete plate 1 is configured as a flat plate made of precast concrete, for example, having a rectangular shape in plan view, and has a long side length L1 (FIG. 4). ) Is set to, for example, 4000 mm, its short side length L2 (FIG. 4) is set to, for example, 2000 mm, and its thickness L3 (FIG. 3) is set to, for example, 300 mm. The long side portions 6 and 7 have a long connecting hole 11 having a long length and a short connecting hole 12 having a short length that open in the opposing connecting end surfaces 9 and 10 and extend in the facing direction F. It is provided in an opposing state. In the present embodiment, four sets 13 of the long connecting holes 11 and the short connecting holes 12 are provided at a required interval in the length direction of the connecting end surfaces 9 and 10, and one long side side is provided. Only the long connection hole 11 is provided in the portion 6, and only the short connection hole 12 is provided in the other long side portion 7. In this embodiment, two sets are provided on both side portions of the connecting end faces 9 and 10.

  As shown in FIGS. 5 to 6, the long connecting hole 11 is connected to the back hole 15 with an enlarged hole 16 that expands toward the connecting end surface 9, and a bottom 17 of the back hole 15. Is in the form of a horizontal straight line, and a longitudinal hole 21 that opens at the plate upper surface 20 is connected to the back end side 19 of the back side hole portion 15. Further, as shown in FIGS. 5 and 7, the short connection hole 12 is an enlarged hole portion 23 in which at least a hole portion on the connection end surface 10 side expands toward the connection end surface 10. In the present embodiment, an enlarged hole portion 23 that expands toward the connecting end surface 10 is connected to the back side hole portion 22. A longitudinal hole 26 that opens at the plate upper surface 20 is connected to the back end 25 of the back hole 22. Hereinafter, the long connection hole 11 and the short connection hole 12 will be described more specifically.

  The total length of the long connecting hole 11 is set to, for example, 525 mm. As shown in FIGS. 5 to 6, the back hole 15 has a horizontal straight line, but the upper surface 27 has a back end side. 19 is inclined upward from the connection end face 9 side (this inclination is a normal draft), and is configured as a circular hole as a whole. The diameter of the back end 29 is set to 60 mm, for example, and the diameter of the tip (end on the connecting end face 9 side) 30 is set to 70 mm, for example. Further, the vertical hole 21 connected to the back end side 19 of the back side hole portion 15 is formed as a vertical circular hole in this embodiment, and the back side inner peripheral portion of the vertical hole 21 is formed. 31 is connected to the back end 29 of the back hole 15. The diameter of the vertical hole 21 is set to 50 mm, for example. In this embodiment, the vertical hole 21 can function as a pusher insertion hole for inserting a pusher 32 (FIG. 11) for moving the connecting rebar 2 as will be described later, and also as described later. It can function as a filling hole for filling the filler (FIG. 18).

  And the said enlarged hole part 16 is continued in a row to the front-end | tip 30 of this back side hole part 15, The length of the hole center direction is set, for example to 90 mm. The enlarged hole portion 16 is formed as a conical surface with an upper portion missing, and its upper surface 33 has a substantially horizontal plane that is an extension of the upper portion 27 of the back hole portion 15, and its lower side. The inner peripheral surface 35 expands into a conical surface toward the connection end surface 9. In the form of the opening end 36 at the connecting end surface 9, about 30% of the upper side presents a horizontal edge 37 and its lower part presents an arc edge 39, and the length of the horizontal edge 37 of the opening end 36 is long. For example, the distance is set to 100 mm, and the distance between the horizontal bottom portion 17 and the lower end 40 of the open end 36 is set to 30 mm, for example. Further, the radius of curvature of the conical lower inner peripheral surface 35 of the enlarged hole portion 16 is set to 150 mm, for example.

  On the other hand, the total length of the short connection hole 12 is set to, for example, 250 mm, and the bottom side hole portion 22 of the short connection hole 12 has a horizontal straight line shape as shown in FIGS. However, the upper part 42 is inclined upward from the back end side 25 toward the connecting end face 10 side, and is configured as a circular hole as a whole. And the diameter of the back end 43 is formed to 60 mm, for example, and the diameter of the front end (end on the connecting end face 10 side) 45 is formed to 70 mm, for example. Further, the vertical hole 26 connected to the back end side 25 of the back side hole portion 22 is formed as a vertical circular hole in this embodiment, and in this embodiment, the back side hole portion. The rear end 43 of the rear side hole portion 22 is provided in a state of being deviated from the rear end 43 of the front end 22 toward the connecting end surface 10, and the stopper end 47 that can come into contact with the front end portion 59 of the connecting rebar 2. Can function as. The diameter of the vertical hole 26 is set to 50 mm, for example. In this embodiment, the vertical hole 26 can function as an air vent hole when filling with a filler such as grout as will be described later, and can also function as a hole for confirming completion of the filling.

  And the said enlarged hole part 23 continues in a row in the front-end | tip 45 of this back | inner side hole part 22, The length of the hole center direction is set, for example to 90 mm. The enlarged hole portion 23 is formed as a conical surface with an upper portion missing, and an upper surface 50 of the enlarged hole portion 23 has a substantially horizontal plane extending from the upper portion 42 of the rear hole portion 22. The inner peripheral surface 51 expands into a conical surface toward the connecting end surface 10. In the form of the opening end 52 on the connecting end surface 10, about 30% of the upper side exhibits a horizontal edge 53 and the lower side portion thereof exhibits an arc edge 55, and the length of the horizontal edge 53 of the opening end 52 is long. The distance is set to 100 mm, for example, and the distance between the horizontal bottom 41 and the lower end 56 of the opening end 52 is set to 30 mm, for example. Further, the radius of curvature of the conical lower inner peripheral surface 51 of the enlarged hole portion 23 is set to 150 mm, for example.

  The conical lower inner peripheral surface 51 is an inclined guide surface 60 that guides the distal end portion 59 in the moving direction of the connecting rebar 2 as will be described later, and is inclined downward toward the connecting end surface 10. The inclined guide surface 60 is connected to the horizontal bottom 41 of the back side hole 22. In the present embodiment, the inclined guide surface 60 is connected to the horizontal bottom 41 of the back side hole portion 22 formed of the circular hole portion via an upwardly projecting arc surface 58 (FIG. 5). Yes.

  In this embodiment, as shown in FIGS. 5 and 7, the upper portion of the short connection hole 12 has a groove shape (for example, a trapezoidal groove shape) recessed upward, and the short connection hole Exhaust grooves 61 extending linearly in the 12 axial directions are provided. The exhaust groove 61 is provided at the central portion in the width direction on the upper surface 50 of the enlarged hole portion 23, and is provided at the upper portion 42 of the back side hole portion 22 as the circular hole portion. It is provided in a continuous state that opens at the connection end face 10 and communicates with the vertical hole 26. Further, the upper surface portion 62 of the exhaust groove 61 is provided so as to incline upward from the horizontal to the rear end 43 in order to facilitate exhaust.

  In addition, in the present embodiment, as shown in FIGS. 5 to 7, the joint end faces 9, 10 above the enlarged hole portions 16, 23 have joint cutout recesses 63, opened at the upper and both ends. 63 is provided. The depth of the joint notch recesses 63, 63 is set to 70 mm, for example, and the width viewed in the facing direction F is set to 3 mm, for example.

  In the present embodiment, the enlarged hole portions 16 and 23 are formed in a conical surface with the upper portion missing, and the upper surfaces 33 and 50 are formed horizontally. The conical lower inner peripheral surface 35 is formed. , 51 is prevented from interfering with the joint notch recesses 63, 63, or close to the joint notch recesses 63, 63. This is to prevent a decrease in strength of the portion where the recess 63 exists. Of course, when the thickness of the concrete plate 1 is sufficiently thick, for example, as shown in FIGS. 8A and 8B, the enlarged hole portions 16 and 23 can be formed in a complete conical surface.

  In the present embodiment, the concrete plate 1 having such a configuration is applied to a non-watering type snow melting panel 65 as shown in FIG. 9, for example. The radiating pipe 67 is folded in a circular arc shape at the short side portions 68 and 68 and embedded in a meandering state. For example, a radiating pipe connecting recess 70 is provided at one corner portion of the plate lower surface 69. It has been.

  Next, an operation process for constructing the pavement part 5 having a snow melting function by laying the concrete plate 1 having the above configuration on the roadbed 3 will be described.

  Prior to connecting the concrete plates 1, 1, as shown in FIG. 10, the linear connecting rebar 2 having a round shaft shape is accommodated in the long connecting hole 11 over the entire length thereof. The connecting rebar 2 may be formed as a round bar having a round cross section with a smooth peripheral surface, or a deformed bar having a round bar shape. In FIG. 10, the case where the connection reinforcement 2 which shows the round bar shape with a smooth surrounding surface is shown.

  In this embodiment, the diameter of the connecting rebar 2 is set to 38 mm and the length is set to 500 mm. Therefore, the connecting rebar 2 can be accommodated over the entire length in the long connecting hole 11 whose total length is set to 525 mm. At the time of this accommodation, as shown in FIG. 10, the front-end | tip part 59 of the connection reinforcing bar 2 is made into the state of the said connection end surface 9 and the same state. In this way, a marginal space 72 of about 25 mm is generated at the back end side 19 of the long connecting hole 11, so that, for example, from the upper end opening 76 of the vertical hole 21 as shown by an arrow in FIGS. The pusher 32 as a bellows-like resin tube is inserted, and the end 46 on the back side of the connecting rebar 2 can be pushed toward the back end 25 of the short connecting hole 12 at the tip 73. Further, since the length of the connecting rebar 2 is set to 500 mm, and the length of the enlarged hole portion 23 is set to 90 mm, the connecting rebar 2 is directed toward the back end side 25 of the short connecting hole 12. When moving, the connecting rebar 2 can be supported in a horizontal state by a horizontal linear bottom portion 17 of the back side hole portion 15 of the long connection hole 11 and horizontally moved in a stable state.

  After the connecting rebar 2 is accommodated in the long connecting hole 11 in this way, as shown in FIG. 11, the long connecting hole 11 and the short connecting hole 12 are communicated with each other to connect the connecting end surfaces 9 and 10 to each other. Make contact. In this abutment, the connecting end faces 9 and 10 may be brought into direct contact with each other. In this embodiment, however, the communicating portion between the long connecting hole 11 and the short connecting hole 12 is set in the circumferential direction. For example, a ring-shaped packing material (not shown), such as an annular rubber material, is placed in contact therewith. The packing material has, for example, a width of about 5 mm and a thickness of about 2 to 3 mm, and the connection end surface 10 so as to surround the open end (open end of the enlarged hole portion 23) 52 of the short connection hole 12. Affixed to.

  When the connecting end surfaces 9 and 10 are brought into contact with each other in this way, as shown in FIG. 11, the opening end 36 of the long connecting hole 11 and the opening end of the short connecting hole 12 (opening end of the enlarged hole portion 23) 52. May completely match, but the position may be displaced by about 3 to 5 mm due to construction errors. FIG. 14 shows a case in which a step 75 is generated because the opening end 52 of the short connection hole 12 is located about 5 mm below the opening end 36 of the long connection hole 11 due to a construction error.

  After the connecting end faces 9 and 10 are brought into contact with each other as described above to cause the long connecting hole 11 and the short connecting hole 12 to communicate with each other, as shown in FIG. The pusher 32 as a bellows-like rod is inserted from the upper end opening 76 of the metal plate, and in the margin space 72, the end portion 46 of the connecting rebar 2 is connected to the short connecting hole at the distal end portion 73 of the pusher 32. 12 is pressed toward the back end side 25. The connecting rebar 2 is pushed by the pusher 32 and moves toward the back end side 25. This movement is performed in a state where the connecting rebar 2 is supported in a horizontal state by a horizontal linear bottom portion 17 of the back side hole portion 15 of the long connection hole 11. As the connecting rebar 2 moves, the tip 59 in the moving direction hits the inclined guide surface 60 formed of a conical surface as shown in FIG. By being pushed after that, the connecting rebar 2 moves in a horizontal state while its tip 59 is guided by the inclined guide surface 60, and finally is smoothly guided by the arc surface 58 protruding upward. As shown in FIG. 16, the short connecting hole 12 is placed on the horizontal bottom 41 of the back hole 22, and the connecting rebar 2 is further pushed into the short connecting hole 12 as indicated by an arrow. It will be.

  This movement will be described in more detail with reference to FIGS. In the present embodiment, the length of the expanded holes 16 and 23 connected to each other is 180 mm. However, since the length of the connecting rebar 2 is set to 500 mm, the position of the center of gravity is It exists in the central part in the length direction. As a result, when the connecting rebar 2 moves, there is no fear that the tip side portion viewed in the moving direction falls down at the extended hole portions 16 and 23 provided continuously. Therefore, when the connecting rebar 2 is moved toward the back end 25 of the short connecting hole 12, the connecting rebar 2 is horizontally aligned with the horizontal straight bottom 17 of the back hole 15 of the long connecting hole 11. It can be supported horizontally and moved horizontally in a stable state.

  Further, when both the enlarged hole portions 16 and 23 are connected to each other, if they are displaced in a plan view, the diameter of the connecting reinforcing bar is 38 mm and the diameter of the inner side hole portions 15 and 22 is 60 mm as described above. Since it is set, the front side portion of the connecting rebar 2 can be moved without difficulty from the long connecting hole 11 toward the short connecting hole 12.

  Then, as shown in FIGS. 13 and 17, the fact that the front end 59 of the connecting rebar 2 has abutted against the back end (the stopper portion 47) 46 of the back hole 22 via the pusher 32. If it can be detected, it can be confirmed that the required insertion of the connecting rebar 2 has been completed.

  As a result, the connecting rebar 2 is inserted into the long connecting hole 11 and the short connecting hole 12 by a length of 250 mm.

  In the state where the connecting rebar 2 is inserted in a horizontal state so as to crotch into the long connecting hole 11 and the short connecting hole 12, as shown by an arrow in FIG. From the vertical hole 21, for example, a filler 77 as a grout is filled. At the time of filling, air is sequentially exhausted smoothly from the vertical hole 26 through the linear exhaust groove 61 provided in the short connection hole 12, so that the filling material can be smoothly filled. . Then, it can be known that the filling of the long connection hole 11 and the short connection hole 12 is completed by the overflow of the filler from the vertical hole 26. In this way, when the filler 77 is filled, in this embodiment, the connecting end surfaces 9 and 10 are brought into contact with each other with the packing material interposed therebetween, so that the filler 77 can be more reliably filled. it can.

  FIG. 18 is a cross-sectional view showing a state in which the filling is completed. In the connecting portion 79 between the concrete plates 1 and 1 where the expanded hole portions 16 and 23 communicated with each other, the connecting rebar 2 extends over the entire circumference. Thus, the cured filler 80 is covered with sound, and the cured filler 80 and the connecting rebar 2 are closely integrated. In this embodiment, as shown in FIGS. 18 to 19, in the connecting portion 79, a filler covering portion 82 a having a thickness of about 30 mm is formed on the lower side of the connecting rebar 2. A filler covering portion 82b having a thickness of about 32 mm is formed on the upper side. In addition, on the left and right sides of the connecting rebar 2, filler covering portions 82 c and 82 c having a thickness of about 40 mm are formed.

  After the concrete plates 1 and 1 are connected to each other in this way, a waterproof elastic joint material 85 is filled in the joint groove 83 formed by the matching of the joint notch recesses 63 and 63, Ingress of rainwater is prevented as much as possible. Thus, according to the present invention, in the connecting portion 79, the connecting rebar 2 is covered with the hardened filler 80 with the required thickness over the entire circumference. A thin layer portion of the filler is not formed. Further, as in Patent Document 2, a thin layer portion is not formed on one side of the connecting portion. Therefore, according to the present invention, unlike the conventional case, the phenomenon that the cured filler is destroyed from the thin layer portion does not occur.

  The pavement 5 can be constructed by providing an asphalt layer 89 on the upper part 87 of the concrete layer laying layer 86 constructed in this way, as shown by a one-dot chain line in FIG. In some cases, the asphalt layer 89 is not provided and the laying layer 86 itself is used as the pavement 5. In the pavement 5 constructed in this way, the hardened filler 80 and the connecting rebar 2 are closely integrated with each other in the connecting portion 79 of the concrete plates 1 and 2 where stress tends to concentrate. Load transmission capacity is enhanced. For this reason, the heavy traffic load accompanying a large truck traveling on the pavement 5 is effectively transmitted from one joined concrete plate to the other concrete plate, thereby reducing the load distribution. It will be illustrated.

  The present invention is by no means limited to those shown in the above-described embodiments, and it goes without saying that various design changes can be made within the scope of the claims. One example is as follows.

(1) FIG. 20 shows another embodiment of the concrete plate 1 according to the present invention, in which the exhaust groove 61 opens at the upper end of the long connection hole 11 at the connection end surface 9 and It is provided in a state extending linearly in the axial direction of the long connecting hole 11 communicating with the vertical hole 2. The upper surface portion 27 of the exhaust groove 61 is provided so as to incline upward from the horizontal to the back end 29 in order to facilitate exhaust. In the case of such a configuration, as shown in FIG. 21, the connecting rebar 2 is inserted in the horizontal state so as to crotch into the long connecting hole 11 and the short connecting hole 12, and the short connecting From the vertical hole 26 of the hole 12, for example, a filler 77 as a grout is filled. At the time of filling, air is smoothly exhausted from the vertical hole 21 sequentially through the exhaust groove 61 provided in the long connecting hole 11, so that the filling material can be smoothly filled. Then, it can be known that the filling of the long connecting hole 11 and the short connecting hole 12 is completed by the overflow of the filler from the vertical hole 21.

(2) FIGS. 22 to 25 show other embodiments of the concrete plate 1 according to the present invention, and the configuration of the combination of the long connecting hole 11 and the short connecting hole 12 is different. In each of these drawings, the long connecting hole 11 and the short connecting hole 12 are communicated so that the connecting end surfaces 9 and 10 are in contact with each other, and the long connecting hole 11 and the short connecting hole 12 are crotched. The straight connecting bars 2 are inserted in a horizontal state so as to rise.

  The configuration common to these is substantially the same as described above, and the long connecting hole 11 and the short connecting hole 12 are opened at the connecting end faces 9 and 10 facing each other as described in FIG. And connecting holes of different lengths extending in the opposite direction. The long connecting hole 11 is connected to the back side hole 15 with an enlarged hole 16 that expands toward the connecting end surface 9, and the bottom 17 of the back side hole of the long connecting hole 11 has a horizontal linear shape. The longitudinal holes 21 and 26 opened at the plate upper surface 20 are connected to the back end sides of the long connecting hole 11 and the short connecting hole 12. The short connection hole 12 is an enlarged hole portion 23 in which at least a hole portion on the connection end surface 10 side expands toward the connection end surface 10. And the length of the said long connecting hole 11 is set to the length which can accommodate the said connecting rebar 2 over the full length at least, and this connecting rebar 2 is the said back side hole part 15 of this long connecting hole 11. The horizontal bottom portion 17 is supported in a horizontal state. Further, the enlarged hole portion 23 of the short connecting hole 12 allows the connecting rebar 2 in a state of being inserted into the long connecting hole 11 to move horizontally toward the back end side 25 of the short connecting hole 12. At this time, it has an inclined guide surface 60 that inclines downward toward the connecting end surface 10 that guides the front end portion 59 in the moving direction of the connecting rebar 2.

  And, with the linear connecting rebar 2 inserted in a horizontal state so as to crotch into the long connecting hole 11 and the short connecting hole 12, the filler is filled from the vertical hole 21, The connecting rebar 2 is filled with a filler over the entire circumference in a portion where the expanded holes 16 and 23 communicated with each other.

  In particular, in each concrete slab 1 of FIG. 22, the upper portions 27 and 42 of the long connection hole 11 and the short connection hole 12 are formed in a horizontal state. Only the hole portion on the 10th side is an enlarged hole portion 23, and the back side hole portion 22 connected thereto is not enlarged. Further, the lower portions 78 and 78 (which are also the inclined guide surfaces 60 in the enlarged hole portion 23) in communication with the enlarged hole portions 16 and 23 are both on the upper side in FIG. In FIG. 22 (B), both are formed as linear surfaces, and in FIGS. 22 (C) and 22 (D), the upward arc-shaped surface is formed. And a straight surface combination.

  Further, the short connection hole 12 in each concrete plate 1 of FIG. 23 is formed as an enlarged hole part 23 that is enlarged only on the connection end face 10 side over the entire circumference. The back side hole part 22 with which the bottom part 41 is horizontal is connected. And the said inclination guide surface 60 of the expansion hole part 23 of the short connection hole 12 is comprised as a protruding arcuate surface or a linear inclined surface.

  And the back side holes 15 and 22 of the long connecting hole 11 and the short connecting hole 12 are formed as holes in which the upper portions 27 and 42 are horizontal.

  Further, in each concrete plate 1 shown in FIG. 24, the upper portions 27 and 42 of the long connection hole 11 and the short connection hole 12 are inclined upward toward the connection end surfaces 9 and 10, and the other configurations are shown in FIG. 22. Same as the case.

  Further, the concrete plate 1 shown in FIG. 25 is a straight line in which the inclined guide surface 60 of the short connection hole 12 is uniformly inclined downward from the back end side 25 of the short connection hole 12 toward the connection end surface 10. The upper part 42 of the short connection hole 12 is provided in an inclined state upward or horizontally toward the connection end face 10. And in these, the exhaust groove 61 can also be provided in the long connection hole 11 or the short connection hole 12 like the above.

(3) The lower portion 23a of the enlarged hole portion 23 constituting the long connecting hole 11 can be configured as a concavity as shown in FIG. .

(4) In each of the above embodiments, the vertical holes 21 and 26 are described as vertical holes. For example, as shown in FIG. 27, a resin elbow 89 is embedded in a curved state. Sometimes. Or as shown in FIG. 28, it may be comprised in a curved state, without using such an elbow.

(5) When filling the filler from the vertical hole 21 or the vertical hole 26, the exhaust groove 61 may be omitted if there is no problem in exhausting air.

(6) The lengths of the enlarged hole portions 16 and 23 in the direction of the core are such that the connecting rebar 2 in the state inserted in the long connecting hole 11 is horizontally directed toward the back end side 25 of the short connecting hole 12. It is set so as not to hinder the movement. For this purpose, when the connecting rebar 2 moves through the enlarged hole portions 16 and 23 connected in consideration of the position of the center of gravity of the connecting rebar 2, the front portion of the connecting rebar 2 in the moving direction is used. However, it is set so that it does not fall into the part in which the extended hole parts 16 and 23 provided continuously exist.

(7) The length and diameter of the connecting rebar 2, the length of the enlarged hole portions 16 and 23 in the direction of the core, and the coating thickness of the hardened filler 80 effectively exert the load transmission ability of the connecting rebar 2. It is set to be done. For example, the diameter of the connecting rebar 2 is 22 to 38 mm, the length is 400 to 1000 mm, the length of the enlarged hole 23 in the core direction is 80 to 250 mm, and the lower side of the connecting rebar 2 is hardened and filled. The coating thickness of the material 80 can be set to 10 to 50 mm, and the coating thickness of the cured filler 80 on the upper side of the connecting reinforcing bars 2 can be set to 10 to 100 mm. In particular, when the back side hole portion 15 of the long connection hole 11 is configured as a circular hole portion, the diameter thereof is preferably set to be about 10 to 50 mm larger than the diameter of the connection rebar 2.

(8) The inclined guide surface 60 capable of guiding the front end portion 59 in the moving direction of the connecting rebar 2 is configured as a conical surface as described above, and the front end portion 59 in the moving direction of the connecting rebar 2. As long as the connecting rebar 2 can be horizontally moved toward the back end side 25 of the short connecting hole 12 by guiding the above, it can be configured as a flat inclined surface or the like.

(9) When the short connecting hole 12 is configured by connecting the enlarged hole portion 23 to the back side hole portion 22, the back side hole portion 22 or the back side hole portion 15 constituting the long connecting hole 11. The cross section may be configured in a circular shape or a non-circular shape such as an ellipse.

(10) In each of the embodiments, the back end 29 of the short connection hole 12 is made to function as the stopper portion 47 so that the connection rebar 2 is crotched into the long connection hole 11 and the short connection hole 12. Although it is in the inserted state, the stopper portion 47 may be configured as a protrusion provided in the short connection hole 12.

(11) In FIG. 1, in addition to the long side portions 6 and 7, both short side portions 90 and 91 are connected using the connecting rebar 2 in the same manner as described above. . The length of the connecting rebar 2 is set to 1000 mm, for example.

(12) The moving means for horizontally moving the connecting rebar 2 accommodated in the long connecting hole 11 toward the back end side 25 of the short connecting hole 12 is a bellows-like resin as described above. In addition to the pipe, it is possible to use various pressing tools such as a steel wire and a twisted wire that have a rigidity capable of being pushed and moved and can be bent. In addition, a magnet provided at the tip end of the string member passed through the vertical hole 21 provided in the short connection hole 12 is magnetically attracted to the tip end surface of the connection reinforcing bar, and the connecting reinforcing bar 2 is pulled by pulling the string member. Means such as moving toward the back end side 25 of the short connecting hole 12 can also be adopted.

(13) In the embodiment, the joint end faces 9 and 10 are provided with joint notch recesses 63 and 63, but the joint notch recesses 63 and 63 may be omitted.

(14) The concrete plate according to the present invention may be applied as a general pavement concrete plate other than the above-mentioned non-watering snowmelt board.

(15) The concrete plate according to the present invention is mainly used for construction of a pavement part that requires long-term durability in which a large vehicle travels frequently, but for constructing other pavement parts such as a parking lot. Sometimes used.

DESCRIPTION OF SYMBOLS 1 Concrete plate 2 Connection reinforcement 3 Roadbed 5 Pavement part 6 Long side part 7 Long side part 9 Connection end surface 10 Connection end surface 11 Long connection hole 12 Short connection hole 15 Back side hole part 16 Expansion hole part 17 Bottom part 19 Back end side 20 Plate upper surface 21 Vertical hole 22 Back side hole 23 Enlarged hole 25 Back end 26 Vertical hole 32 Pusher 60 Inclined guide surface 61 Exhaust groove

Claims (4)

A concrete plate for paving that constructs a pavement part by being connected to each other and laid on the roadbed, and has a long and long connecting hole that opens at an opposing connecting end surface and extends in the opposing direction. A short short connecting hole is provided in an opposing state, and the long connecting hole is provided with an enlarged hole portion that extends toward the connecting end surface at the back side hole portion, and the back side of the long connecting hole. The bottom portion of the hole portion has a horizontal straight line, and a longitudinal hole opened on the upper surface of the plate is connected to the back end side of the long connection hole and the short connection hole, and the short connection hole has at least The hole portion on the connection end surface side is an enlarged hole portion that expands toward the connection end surface;
The long connecting hole and the short connecting hole communicate with each other and the connecting end faces are brought into contact with each other directly or with a packing material interposed therebetween, so that the long connecting hole and the short connecting hole are crotched. In the state where the linear connecting rebars having a round shaft shape are inserted in a horizontal state, the connecting material is filled from any one of the vertical holes, so that the connecting portion is the portion where the expanded hole portion is in communication. The rebar is in a state of being covered with a filler all around its circumference,
The length of the long connecting hole is set to a length that can accommodate at least the entire length of the connecting reinforcing bar, and the connecting reinforcing bar is a horizontal straight bottom portion of the back side hole portion of the long connecting hole. The enlarged hole portion of the short connecting hole is supported in a horizontal state, and the connecting rebar inserted in the long connecting hole is in a horizontal state toward the back end side of the short connecting hole. An inclined guide surface inclined downward toward the connection end surface, which can guide the tip of the connection rebar in the moving direction when being moved to
An exhaust groove having a groove shape recessed upward is formed in an upper portion of the short connection hole so as to communicate with the vertical hole and open at the connection end surface, and straight in the axial direction of the short connection hole. A concrete plate for paving, which is provided so as to extend in a shape . A concrete plate for paving that constructs a pavement part by being connected to each other and laid on the roadbed, and has a long and long connecting hole that opens at an opposing connecting end surface and extends in the opposing direction. A short short connecting hole is provided in an opposing state, and the long connecting hole is provided with an enlarged hole portion that extends toward the connecting end surface at the back side hole portion, and the back side of the long connecting hole. The bottom portion of the hole portion has a horizontal straight line, and a longitudinal hole opened on the upper surface of the plate is connected to the back end side of the long connection hole and the short connection hole, and the short connection hole has at least The hole portion on the connection end surface side is an enlarged hole portion that expands toward the connection end surface;
The long connecting hole and the short connecting hole communicate with each other and the connecting end faces are brought into contact with each other directly or with a packing material interposed therebetween, so that the long connecting hole and the short connecting hole are crotched. In the state where the linear connecting rebars having a round shaft shape are inserted in a horizontal state, the connecting material is filled from any one of the vertical holes, so that the connecting portion is the portion where the expanded hole portion is in communication. The rebar is in a state of being covered with a filler all around its circumference,
The length of the long connecting hole is set to a length that can accommodate at least the entire length of the connecting reinforcing bar, and the connecting reinforcing bar is a horizontal straight bottom portion of the back side hole portion of the long connecting hole. The enlarged hole portion of the short connecting hole is supported in a horizontal state, and the connecting rebar inserted in the long connecting hole is in a horizontal state toward the back end side of the short connecting hole. An inclined guide surface inclined downward toward the connection end surface, which can guide the tip of the connection rebar in the moving direction when being moved to
The short connecting hole is provided with an enlarged hole portion that expands toward the connecting end surface in a back side hole portion whose bottom portion has a horizontal linear shape, and the enlarged hole portion is inserted into the long connecting hole. When the connecting rebar in the state of being moved is moved horizontally toward the back end side of the short connection hole, the tip of the connecting rebar can be guided in a moving direction, and the inclination is downward toward the connecting end surface. An inclined guide surface that
An exhaust groove having a groove shape recessed upward is formed in an upper portion of the short connection hole so as to communicate with the vertical hole and open at the connection end surface, and straight in the axial direction of the short connection hole. A concrete plate for paving, which is provided so as to extend in a shape . A concrete plate for paving that constructs a pavement part by being connected to each other and laid on the roadbed, and has a long and long connecting hole that opens at an opposing connecting end surface and extends in the opposing direction. A short short connecting hole is provided in an opposing state, and the long connecting hole is provided with an enlarged hole portion that extends toward the connecting end surface at the back side hole portion, and the back side of the long connecting hole. The bottom portion of the hole portion has a horizontal straight line, and a longitudinal hole opened on the upper surface of the plate is connected to the back end side of the long connection hole and the short connection hole, and the short connection hole has at least The hole portion on the connection end surface side is an enlarged hole portion that expands toward the connection end surface;
The long connecting hole and the short connecting hole communicate with each other and the connecting end faces are brought into contact with each other directly or with a packing material interposed therebetween, so that the long connecting hole and the short connecting hole are crotched. In the state where the linear connecting rebars having a round shaft shape are inserted in a horizontal state, the connecting material is filled from any one of the vertical holes, so that the connecting portion is the portion where the expanded hole portion is in communication. The rebar is in a state of being covered with a filler all around its circumference,
The length of the long connecting hole is set to a length that can accommodate at least the entire length of the connecting reinforcing bar, and the connecting reinforcing bar is a horizontal straight bottom portion of the back side hole portion of the long connecting hole. The enlarged hole portion of the short connecting hole is supported in a horizontal state, and the connecting rebar inserted in the long connecting hole is in a horizontal state toward the back end side of the short connecting hole. An inclined guide surface inclined downward toward the connection end surface, which can guide the tip of the connection rebar in the moving direction when being moved to
An exhaust groove having a groove shape recessed upward is formed in an upper portion of the long connection hole so as to communicate with the vertical hole and open at the connection end surface, and straight in the axial direction of the long connection hole. A concrete plate for paving, which is provided so as to extend in a shape . A concrete plate for paving that constructs a pavement part by being connected to each other and laid on the roadbed, and has a long and long connecting hole that opens at an opposing connecting end surface and extends in the opposing direction. A short short connecting hole is provided in an opposing state, and the long connecting hole is provided with an enlarged hole portion that extends toward the connecting end surface at the back side hole portion, and the back side of the long connecting hole. The bottom portion of the hole portion has a horizontal straight line, and a longitudinal hole opened on the upper surface of the plate is connected to the back end side of the long connection hole and the short connection hole, and the short connection hole has at least The hole portion on the connection end surface side is an enlarged hole portion that expands toward the connection end surface;
The long connecting hole and the short connecting hole communicate with each other and the connecting end faces are brought into contact with each other directly or with a packing material interposed therebetween, so that the long connecting hole and the short connecting hole are crotched. In the state where the linear connecting rebars having a round shaft shape are inserted in a horizontal state, the connecting material is filled from any one of the vertical holes, so that the connecting portion is the portion where the expanded hole portion is in communication. The rebar is in a state of being covered with a filler all around its circumference,
The length of the long connecting hole is set to a length that can accommodate at least the entire length of the connecting reinforcing bar, and the connecting reinforcing bar is a horizontal straight bottom portion of the back side hole portion of the long connecting hole. The enlarged hole portion of the short connecting hole is supported in a horizontal state, and the connecting rebar inserted in the long connecting hole is in a horizontal state toward the back end side of the short connecting hole. An inclined guide surface inclined downward toward the connection end surface, which can guide the tip of the connection rebar in the moving direction when being moved to
The short connecting hole is provided with an enlarged hole portion that expands toward the connecting end surface in a back side hole portion whose bottom portion has a horizontal linear shape, and the enlarged hole portion is inserted into the long connecting hole. When the connecting rebar in the state of being moved is moved horizontally toward the back end side of the short connection hole, the tip of the connecting rebar can be guided in a moving direction, and the inclination is downward toward the connecting end surface. An inclined guide surface that
An exhaust groove having a groove shape recessed upward is formed in an upper portion of the long connection hole so as to communicate with the vertical hole and open at the connection end surface, and straight in the axial direction of the long connection hole. A concrete plate for paving, which is provided so as to extend in a shape .

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