JP2012229566A - Concrete product and assembly jig for concrete product bar arrangement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete product for which bars are arranged so as to obtain more effective breaking strength at an enlarged diameter part in a concrete body part for which a base cylinder part and the enlarged diameter part are integrally molded.SOLUTION: In a concrete body part 12, an enlarged diameter part 15 is integrally molded at one end of a base cylinder part 13. For a plurality of axial direction bars 16 arranged at prescribed pitches in a circumferential direction inside the concrete body part 12, a straight bar arrangement part 17 is arranged inside the base cylinder part 13 and a tapered bar arrangement part 18 is arranged in an expanding shape inside the enlarged diameter part 15 through a ring bar 19. A ring-like base cylinder side end face metal fitting 21 for fixing the straight bar arrangement part 17 is provided on an end face of the base cylinder part 13 of the concrete body part 12, and a ring-like enlarged diameter side end face metal fitting 24 having an outer diameter and an inner diameter larger than those of the base cylinder side end face metal fitting 21 for fixing the tapered bar arrangement part 18 is provided on an end face of the enlarged diameter part 15.

Description

  The present invention relates to a concrete product such as a ready-made concrete pile or a concrete pole, and an assembly jig for reinforcing a concrete product used when the concrete product is manufactured.

  As for the shape of concrete products such as ready-made concrete piles or concrete poles, the head side or the lower side is widened as shown in FIG. 18 in addition to the general straight type and the node type having a node-like protrusion. There is an enlarged type (see, for example, Patent Document 1).

  Further, as the node type, there is an enlarged diameter node type in which the head portion or the lower portion is widened (see, for example, Patent Document 2).

  In any of the types listed above, the conventional concrete product generally has the axial streak 2 arranged straight in the concrete main body 1 as shown in FIG.

JP 63-9508 A Japanese Patent Laid-Open No. 2-266019

  Accordingly, as shown in FIG. 18, in the base tube portion 3 having a relatively small diameter, the axial streak 2 is arranged at a cross-sectional location close to the surface of the concrete main body portion 1, and the diameter thereof is increased with respect to the base tube portion 3. In the expanded diameter portion 4, since the axial streak 2 is arranged at a cross-sectional location far from the surface of the concrete main body portion 1, the effective height of the axial streak 2 is small in the expanded diameter portion 4, and the wall thickness of the pile is reduced. On the other hand, more effective breaking strength cannot be obtained.

  Further, in the diameter-expanded section 4 of the diameter-expanded type and the diameter-expanded section type as described above, the axial streak 2 is increased in a taper shape toward the surface side of the concrete main body 1 as shown in FIGS. It is not easy to arrange the bars in a predetermined shape, and when fixing one end portion and the other end portion of the axial stripe 2 to the end fittings 5 and 6, the axial reinforcement is particularly applied to the end face fitting 6 on the enlarged diameter side. It is not easy to align and fix the end of the taper 2 with the diameter of the taper 2, and when the axial bar 2 is tensioned by the end fittings 5 and 6, the axial bar 2 is held in a taper shape. It is difficult to do this, and there is a problem that it takes time and labor in the bar arrangement work, and costs are increased.

  The present invention has been made in view of such a point, and is a larger diameter portion in a concrete main body portion in which a base cylinder portion and a diameter-expanded portion having a larger outer peripheral side surface than the base cylinder portion are integrally formed. A concrete product that has been laid to obtain effective breaking strength, and an assembly jig for laying the concrete product that can be used when manufacturing such a concrete product to solve the problem of bar placement work. The purpose is to provide.

  The invention described in claim 1 is a concrete main body part integrally formed with a diameter-enlarged part formed on the outer peripheral side surface of a larger diameter than the base cylinder part at least at one end part of the base cylinder part formed into a cylindrical shape, It is arranged at a predetermined pitch in the circumferential direction in the concrete main body part, and has a straight bar arrangement part arranged straight in the base tube part, and is bent up from the straight bar arrangement part in the enlarged diameter part. A plurality of axial reinforcements having tapered reinforcements arranged in an expanded manner, and arranged on the outer peripheral side of the boundary position between the straight reinforcement arrangement and the tapered reinforcement arrangement in each axial reinforcement. It is a concrete product comprising a reinforced ring bar.

  The invention described in claim 2 is the concrete product according to claim 1, wherein the concrete product is provided on an end surface of the base tube portion of the concrete main body portion, and is provided on an end portion on the base tube portion side of each axial streak. A plurality of fixing holes for fixing the head-shaped end portion are provided on the end surface of the ring-shaped base tube side end metal fitting formed at a predetermined pitch in the circumferential direction, and the enlarged diameter portion of the concrete body portion, and A plurality of fixing holes for fixing the head-shaped end provided at the end of the directional line on the diameter-expanded portion side are formed at a predetermined pitch in the circumferential direction, and have an outer diameter and an inner diameter larger than those of the base tube side end fitting It is a concrete product provided with a ring-shaped enlarged-diameter end face metal fitting.

  According to a third aspect of the present invention, there is provided a through hole in which the fixing hole of the enlarged-diameter end face metal fitting in the concrete product according to the second aspect is formed in a size that allows the head end of the axial streak to be inserted. And the axial portion of the axial streak is formed by being continuously cut in the radial direction from the insertion hole, and can be inserted by moving in the radial direction from the insertion hole and having a smaller diameter than the head-shaped end portion of the axial streak. It is a concrete product provided with a formed locking hole.

  According to a fourth aspect of the present invention, in the concrete product according to the third aspect, the diameter-enlarged end face metal fitting is formed on the outer surface side of the locking hole, and the axial streak moves in the radial direction from the insertion hole. It is a concrete product provided with a counterbore groove into which the head-shaped end portion of is fitted.

  The invention described in claim 5 is an assembly jig for reinforcing concrete products used when the concrete product according to any one of claims 1 to 4 is formed, and according to any one of claims 1 to 4. A ring-shaped jig body that is detachably attached to a side where the radial bending reaction force of the axial stripe acts on the inner and outer circumferences of the plurality of axial stripes of the plurality of axial stripes. An assembly jig for reinforcing a concrete product, comprising a plurality of guide portions which are provided in the jig main body at intervals of the reinforcing bars in the axial direction and which position the axial reinforcing bars.

  According to a sixth aspect of the present invention, there is provided a plurality of arc-shaped members to which the jig body in the assembly jig for concrete product bar arrangement according to the fifth aspect can be connected in a circular shape, and the plurality of arc-shaped members. Is an assembly jig including a connecting member that connects the members in a circular shape so that their diameters can be changed or disassembled.

  According to the first aspect of the present invention, the straight reinforcing bar portion of the plurality of axial bars is arranged in the base tube portion of the concrete main body portion, and the outer peripheral side surface is formed to have a larger diameter than the base tube portion. Since the taper bar arrangement that is bent up from the straight bar arrangement part via the ring reinforcement is arranged in an expanded shape in the expanded diameter part of the concrete main body part, the same as the base tube part of the concrete main body part In the expanded diameter part, the axial streak can be arranged at the cross-sectional location close to the surface, and it is more effective in the expanded diameter part in the concrete body part in which the base cylinder part and the enlarged diameter part larger in diameter than this base cylinder part are integrally formed. It is possible to provide concrete products such as concrete piles that have been laid out so as to obtain an appropriate breaking strength.

  According to the invention described in claim 2, the plurality of taper bar arrangement portions are arranged in an expanded shape within the diameter-expanded portion of the concrete main body portion, and the diameter-expansion side end fitting is the opposite base tube side end surface. Since the outer diameter and inner diameter are larger than the metal fitting, the plate width of the enlarged side end fitting that corresponds to the difference between the outer diameter and the inner diameter can be reduced in the same way as the plate width of the base cylinder side end fitting. Reduction can be achieved. Further, when each axial streak is tensioned in the axial direction by the base end fitting on the base tube side and the end fitting on the enlarged diameter side larger than the end fitting on the base tube side, the outer peripheral side of these end fittings and each axial streak The taper-shaped bar arrangement part of each axial direction line | wire can be hold | maintained in an expanded form by the ring line | wire arrange | positioned by this.

  According to the invention described in claim 3, the fixing hole of the diameter-expansion side end fitting is a head shape of the axial streak from the insertion hole formed so that the head end of the axial streak can be inserted. A locking hole having a smaller diameter than the end is continuously cut in the radial direction, and the axial portion of the axial streak can be fitted into the locking hole by moving in the radial direction. Can be easily fixed at a predetermined position on the diameter-expansion side end face metal fitting, and the time spent for this work can be greatly reduced, thereby reducing the cost.

  According to the fourth aspect of the present invention, the head-like end portion of the axial streak moved in the radial direction from the insertion hole is fitted in the counterbored groove formed on the outer surface side of the locking hole of the enlarged diameter side end fitting. Since it was made to match | combine, the possibility that the head-shaped end part of the axial streak fitted to the counterbore groove may return to the insertion hole and come off from the diameter-enlarged end face fitting can be reliably prevented.

  According to the fifth aspect of the present invention, it is a place where the radial bending reaction force of the axial direction of the inner and outer peripheries of the plurality of axial direction muscles acts and is detachable on the side opposing the radial bending reaction force. An assembly jig for bar arrangement of a concrete product, comprising a ring-shaped jig body attached to the bar and a plurality of guide portions that are provided at intervals between bar arrangements of each axis and that position each axis bar is used. As a result, it is possible to hold the axial reinforcing bars expanded to the surface side of the concrete main body at a predetermined reinforcing bar position, facilitate the reinforcing bar arrangement work to a predetermined shape, and fix the expanding end metal fittings. The work of aligning and fixing the axial streak in the hole can be facilitated. In short, the assembly jig can be used to greatly reduce the mounting time of the end metal fitting on the enlarged diameter side, and the work of bar arrangement when manufacturing concrete products Can save you time and time It attained a cost reduction with.

  According to the invention described in claim 6, since the jig main body of the assembly jig is formed by connecting a plurality of arc-shaped members in a circular shape so that the diameter can be changed or disassembled by the connecting member, When the end of the fixture is fixed to the diameter-end side metal fittings, the jig body of the assembly jig can be easily changed by changing the diameter or disassembled, and the reinforcing bar for assembly is used for the diameter-expanded part of the concrete body Compared to the above, it is possible to repeatedly use a detachable assembly jig, thereby reducing the cost.

It is a half sectional view showing an embodiment of a concrete product according to the present invention. It is a side view by the side of the base cylinder of a product same as the above. It is a side view of the diameter expansion side of a product same as the above. It is sectional drawing which shows the fixing hole of the diameter expansion side end surface metal fitting of a product same as the above. It is a top view which shows the fixing hole of the diameter expansion side end surface metal fitting of a product same as the above. It is process drawing which shows an example of the braiding method of a product same as the above, (a) is an assembly process of an axial direction line | wire and a circumferential direction line | wire, (b) is an attachment process of a base cylinder side end surface metal fitting and a ring line, (c) is The assembly jig attaching step, (d) shows the attachment of the enlarged-diameter end face fitting and the assembly jig removing step. (A) is a front view which shows the 1st example of the assembly jig which concerns on this invention, (b) is a front view which shows the diameter-reduced state at the time of the removal. (A) is a front view which shows the 2nd example of a jig | tool same as the above, (b) is a front view which shows the diameter-reduced state at the time of the removal. (A) is a front view which shows the 3rd example of a jig | tool same as the above, (b) is a front view which shows the decomposition | disassembly state at the time of the removal. (A) is a front view which shows the 4th example of a jig | tool same as the above, (b) is a front view which shows the decomposition | disassembly diameter reduction state at the time of the removal. It is sectional drawing which shows the modification 1 of the concrete product which concerns on this invention. It is sectional drawing which shows the modification 2 of a product same as the above. It is sectional drawing which shows the modification 3 of a product same as the above. It is sectional drawing which shows the modification 4 of a product same as the above. It is a half sectional view showing other embodiments of a concrete product concerning the present invention. It is process drawing which shows an example of the braiding method of the concrete product shown by FIG. 15, (a) is an assembly process of an axial direction stripe | line | column and a circumferential direction line | wire, (b) is attachment of a base cylinder side end surface metal fitting and a ring line. Step (c) shows the step of attaching the inner ring bar, (d) shows the step of attaching the assembly jig, and (e) shows the step of attaching the enlarged-side end face fitting and the step of removing the assembly jig. (A) is a front view of the assembly jig used in FIG.16 (d), (b) is a front view which shows the decomposition | disassembly state at the time of the removal. It is sectional drawing which shows the conventional concrete product.

  Hereinafter, the present invention will be described with reference to one embodiment shown in FIGS. 1 to 6, various specific examples of the assembly jig for reinforcing concrete products shown in FIGS. 7 to 10, and FIGS. 11 to 14. Reference will be made in detail to various variations of the concrete products shown.

  1 to 3 show an embodiment of a concrete product 11 such as a prestressed concrete pile, and the concrete main body portion 12 is integrally formed with a node portion 14 on a base tube portion 13 formed into a cylindrical shape. In addition, a diameter-enlarged portion 15 is formed integrally with one end portion of the base tube portion 13 and the outer peripheral side surface of the base tube portion 13 has a larger diameter.

  A plurality of axial streaks 16 are arranged in the concrete body portion 12 at a predetermined pitch in the circumferential direction, and the straight tube layout of the axial streaks 16 is arranged in the base tube portion 13 of the concrete body portion 12. The reinforcing bar 17 is arranged in a straight shape, and the tapered reinforcing bar 18 bent up from each straight reinforcing bar 17 is expanded in the enlarged diameter part 15 of the concrete main body 12. The bars are arranged in a shape.

  On the outer peripheral side of the boundary position between the straight reinforcing bar 17 and the tapered reinforcing bar 18 in each of the axial reinforcing bars 16, a ring bar 19 is arranged and bound.

  On the outer peripheral portion of the straight reinforcing bar portion 17 of each axial reinforcing bar 16, a peripheral reinforcing bar 20 such as a required center reinforcing bar or a helical reinforcing bar is arranged and bound. Similarly, a circumferential bar 20a such as a required center reinforcing bar or a helical bar is also arranged and bound to the outer peripheral part of the tapered reinforcing bar 18 of each axial bar 16.

  The axial bars 16, the ring bars 19, and the circumferential bars 20, 20a are generally made of reinforcing bars, but other metals or non-metallic materials that ensure the strength may be used. .

  A ring-shaped base tube side end fitting 21 shown in FIG. 2 is provided on the end surface of the base tube portion 13 of the concrete main body portion 12.

  The base tube side end fitting 21 is obtained by welding a peripheral side plate 21b to the periphery of a ring plate-like fitting main body 21a. A plurality of fixing holes 23 formed in a bowl shape in the circumferential direction for fixing the head-like end portion 22 provided at the end of the directional stripe 16 on the base tube portion side are formed at a predetermined pitch in the circumferential direction.

  On the end face of the enlarged diameter portion 15 of the concrete main body 12, as shown in FIG. 3, a ring-shaped enlarged diameter side end fitting 24 having an outer diameter and an inner diameter larger than those of the base cylinder side end fitting 21. Is provided.

  This enlarged diameter side end fitting 24 has an outer diameter and an inner diameter larger than the fitting main body 21a of the base cylinder side end fitting 21, and is a ring plate-shaped fitting main body formed in the same width as the fitting main body 21a. The peripheral side plate portion 24b is welded to the peripheral edge of the 24a, and the head portion provided at the end portion on the diameter increasing portion side of each of the axial streaks 16 is provided on the metal fitting main body portion 24a of the diameter increasing side end surface metal fitting 24. A plurality of fixing holes 26 formed in a bowl shape in the radial direction for fixing the end 25 are formed at a predetermined pitch in the circumferential direction.

  As shown in FIGS. 4 and 5, the fixing hole 26 of the diameter-enlarged side end fitting 24 is formed to have a size that allows the head-like end portion 25 of the tapered reinforcing portion 18 of the axial direction stripe 16 to be inserted. The insertion hole 27 is formed, and a locking hole 28 having a smaller diameter than the head-like end portion 25 of the tapered reinforcing bar portion 18 is provided. The locking hole 28 is continuously cut and formed radially inward (near the center) from the insertion hole 27, and the shaft portion of the tapered reinforcing bar portion 18 of the axial streak 16 is radially inward from the insertion hole 27. It is possible to fit into this locking hole 28 by moving to.

  A counterbore groove 29 is formed on the outer surface side of the locking hole 28 of the diameter-expansion side end fitting 24, and a head-like end portion 25 of the tapered reinforcing bar 18 moved radially inward from the insertion hole 27. It is provided so as to be fitted in the counterbore groove 29.

  Hereinafter, an example of the manufacturing method (reinforcing bar braiding method) of the enlarged diameter ready-made concrete pile will be described with reference to FIG.

  As shown in FIG. 6A, an unreinforcing bar bar is assembled with an axial bar 16 and a circumferential bar (guard bar) 20. At that time, the circumferential reinforcing bar 20 is not placed in the axial reinforcing bar portion that is to become the tapered reinforcing bar portion 18.

  As shown in FIG. 6B, the base tube side end fitting 21 is attached to the end portion of the straight reinforcing bar portion 17 that is not on the enlarged diameter side in the same manner as in the conventional method.

  In addition, a ring line 19 is disposed at an axial position where the axial line 16 is bent in a tapered shape on the outer peripheral portion of each axial line 16 on the diameter expansion side. As the ring bar 19, a ring bar processed by a round bar, a deformed bar, a flat bar or the like is used. The ring line 19 is disposed on the outer peripheral side of the axial line 16 and is fixed at a predetermined position using a binding line, a clip, or the like.

  As shown in FIG. 6 (c), each axial streak 16 is expanded in an expanded manner by bending up the ring streak 19 as a fulcrum. The jig 31 is set, and the tapered reinforcing bar 18 is formed. The assembly jig 31 may be a ring processed with a round bar, deformed bar, flat bar, etc., but it is desirable to have a structure that can position the axial reinforcement 16 and can be removed after the rebar dragon is assembled. .

  That is, as shown in FIGS. 7 to 10, the assembly jigs 31a, 31b, 31c, 31d for reinforcing concrete products are rings that are detachably attached to the inner peripheral side of the plurality of tapered reinforcing bars 18. A plurality of guide portions 33 for positioning each taper bar arrangement portion 18 are provided on the outer periphery of the jig-shaped jig body 32 at the bar arrangement interval of each taper bar arrangement portion 18. The jig body 32 includes a plurality of arc-shaped members 34 that can be connected in a circular shape, and a connecting member 35 that connects these arc-shaped members 34 in a circular shape so that the diameter of the arc-shaped members 34 can be reduced or disassembled.

  Returning to FIG. 6, as shown in FIGS. 6 (c) to 6 (d), each tapered reinforcing bar 18 is fixed to the enlarged-side end metal fitting 24. In this case, fixing holes 26 that are formed in a bowl shape in the radial direction are processed at a predetermined pitch over the entire circumference of the enlarged diameter side end fitting 24.

  As shown in FIGS. 4 and 5, the fixing holes 26 include an insertion hole 27 through which the head of each tapered reinforcing bar 18 is inserted, and a locking hole formed with a smaller diameter than the insertion hole 27. 28 are continuously provided.

  A shaft portion of the tapered reinforcing bar portion 18 that is moved radially inward (near the center) from the insertion hole 27 is inserted into the locking hole 28 of each fixing hole 26, and the head end portion of the tapered reinforcing bar portion 18 is inserted. 25 is engaged. On the outer surface side of the locking hole 28, a counterbore groove 29 for accommodating the head-shaped end portion 25 of the tapered reinforcing bar portion 18 is formed to be approximately 2 to 4 mm larger than the locking hole 28. These locking holes 28 and counterbored grooves 29 are arranged radially inward from the insertion hole 27 because the bending reaction force of the axial streak 16 acts radially inward.

  That is, when fixing each tapered reinforcing bar 18 to the enlarged diameter side end fitting 24, the locking hole 28 of the fixing hole 26 provided in the enlarged diameter end fitting 24 is inserted as shown in FIG. Since it is machined radially inward (closer to the center) than the hole 27, the shaft portion of the taper bar 18 is moved in the center direction of the diameter-side end fitting 24 due to the bending reaction force of the taper bar 18. While moving and fitting into the locking hole 28, the head-like end portion 25 of the tapered reinforcing bar portion 18 fits in the counterbore groove 29.

  On the other hand, when the insertion hole 27 of each fixing hole 26 is provided with a screw groove 27a, and a screw (not shown) is screwed into the screw groove 27a so as to close the insertion hole 27, a tapered reinforcing bar arrangement is provided. The shaft portion of the portion 18 can be prevented from returning to the insertion hole 27, and the taper bar arrangement portions 18 can be reliably prevented from coming out of the fixing holes 26.

  Returning to FIG. 6, as shown in FIG. 6 (d), after fixing each tapered reinforcing bar 18 to the enlarged diameter side end fitting 24, the assembly jig 31 is reduced in diameter or disassembled to externally. The circumferential reinforcing bars (care bars) 20a are placed on the outer periphery of each tapered reinforcing bar portion 18.

  Thereafter, tension of the axial streak 16 by the base tube side end fitting 21 and the enlarged diameter side end fitting 24 in the mold rotated by a centrifugal molding machine (not shown), concrete placement, centrifugal molding by the centrifugal molding machine, Curing and demolding are performed in the same manner as before.

  Next, specific examples of the assembly jigs 31a, 31b, 31c, and 31d for concrete product bar arrangement will be described with reference to FIGS.

  The assembly jig 31a shown in FIG. 7 is a portion where the radial bending reaction force of the axial stripe 16 acts on the inner and outer peripheries of the plurality of axial stripes 16, that is, the side opposite to the radial bending reaction force, that is, each side A U-shaped groove for positioning the taper bar 18 of each axial bar 16 on the outer periphery of a flat bar ring-shaped jig body 32 that is detachably attached to the inner side of the taper bar 18 The plurality of guide portions 33 are provided at the bar arrangement intervals of the tapered bar arrangement portions 18. The jig body 32 has two arc-shaped members 34 that can be connected in a circular shape, and connects these arc-shaped members 34 in a circular shape as shown in FIG. 7 (a) and also in FIG. 7 (b). As shown in the figure, a pin-like connecting member 35 is provided which can be removed by changing one of its diameters, that is, can be reduced in diameter, or can be disassembled by removing both.

  The assembly jig 31b shown in FIG. 8 is a portion where the radial bending reaction force of the axial stripe 16 acts on the inner and outer peripheries of the plurality of axial stripes 16, that is, the side opposite to the radial bending reaction force, A plurality of pairs of steel materials for positioning the tapered reinforcing bars 18 of the axial reinforcing bars 16 on the outer peripheral part of the flat bar ring-shaped jig body 32 that is detachably attached to the inner peripheral side of the tapered reinforcing bars 18 A plurality of guide portions 33 formed by welding are provided at the bar arrangement intervals of the taper bar arrangement portions 18. The jig body 32 has two arcuate members 34 that can be connected in a circle, and these arcuate members 34 are connected in a circle as shown in FIG. 8 (a) and in FIG. 8 (b). As shown in the figure, a pin-like connecting member 35 is provided which can be removed by changing one of its diameters, that is, can be reduced in diameter, or can be disassembled by removing both.

  The assembly jig 31c shown in FIG. 9 is a portion where the radial bending reaction force of the axial stripe 16 acts on the inner and outer peripheries of the plurality of axial stripes 16, that is, on the side opposite to the radial bending reaction force, A plurality of pairs of steel materials for positioning the tapered reinforcing bar portions 18 of the axial reinforcing bars 16 on the outer peripheral portion of a round steel ring-shaped jig body 32 that is detachably attached to the inner peripheral side of the tapered reinforcing bar portion 18. A plurality of guide portions 33 formed by welding are provided at the bar arrangement intervals of the taper bar arrangement portions 18. The jig body 32 has two arcuate members 34 that can be connected in a circle, and these arcuate members 34 are connected in a circle as shown in FIG. 9 (a) and in FIG. 9 (b). As shown in the figure, a bracket 35a and a pin 35b are provided as connecting members that can be disassembled by removing both, or can be changed in diameter by removing one of them.

  The assembly jig 31d shown in FIG. 10 is a portion where the radial bending reaction force of the axial stripe 16 acts on the inner and outer circumferences of the plurality of axial stripes 16, that is, the side opposite to the radial bending reaction force, that is, each side. A plurality of pairs of steel materials for positioning the tapered reinforcing bar portions 18 of the axial reinforcing bars 16 on the outer peripheral portion of a round steel ring-shaped jig body 32 that is detachably attached to the inner peripheral side of the tapered reinforcing bar portion 18. A plurality of guide portions 33 formed by welding are provided at the bar arrangement intervals of the taper bar arrangement portions 18. The jig body 32 has three arc-shaped members 34 that can be connected in a circular shape, and these arc-shaped members 34 are connected in a circular shape as shown in FIG. 10 (a) and in FIG. 10 (b). As shown in the figure, a bracket 35a and a pin 35b are provided as connecting members that can be partly removed to change the diameter, that is, can be reduced in diameter, or can be partly removed and disassembled.

  Next, the effects obtained by the above embodiment are as follows.

  In the base tube portion 13 of the concrete main body portion 12, a straight bar arrangement portion 17 of a plurality of axial bars 16 is arranged, and the outer peripheral side surface of the concrete main body portion 12 is formed with a larger diameter than the base tube portion 13. A tapered reinforcing bar 18 bent up from the straight reinforcing bar 17 through the ring bar 19 in the enlarged diameter part 15 is arranged in an expanded manner, and the straight reinforcing bar 17 and the tapered reinforcing bar 17 are tapered. Since the circumferential reinforcing bars 20 and 20a are arranged on the outer peripheral part of the reinforcing bar part 18, respectively, similarly to the base cylinder part 13 of the concrete main body part 12, the axial reinforcing bars 16 and The circumferential reinforcing bar 20a can be arranged, and a more effective fracture strength can be obtained with the enlarged diameter part 15 in the concrete main body part 12 in which the base cylinder part 13 and the enlarged diameter part 15 larger in diameter than the base cylinder part 13 are integrally formed. It is possible to provide concrete products 11 such as concrete piles that are arranged in such a way that they can be arranged.

  Further, a plurality of tapered bar arrangement portions 18 are arranged in an expanded shape in the enlarged diameter portion 15 of the concrete main body portion 12, and the enlarged diameter side end fitting 24 has a larger diameter than the base tube side end fitting 21 on the opposite side. Therefore, the plate width of the enlarged side end fitting 24 corresponding to the difference between the outer diameter and the inner diameter can be reduced in the same manner as the plate width of the base end fitting 21, thereby reducing the cost. I can plan.

  Further, when each axial stripe 16 is tensioned in the axial direction by the base tube side end fitting 21 and the enlarged diameter side end fitting 24 having a diameter larger than that of the base tube side end fitting 21, the end face fittings 21, 24 and The tapered reinforcing bar portions 18 of the respective axial bars 16 can be held in an expanded form by the ring bars 19 arranged and bound on the outer peripheral side of each of the axial bars 16.

  The fixing hole 26 of the diameter-expansion side end fitting 24 has a head-like end portion of the taper bar arrangement portion 18 through an insertion hole 27 formed so that the head-like end portion 25 of the taper arrangement portion 18 can be inserted. A locking hole 28 having a diameter smaller than 25 is continuously cut inward in the radial direction, and the shaft portion of the tapered reinforcing bar 18 can be fitted into the locking hole 28 by moving inward in the radial direction. The work of fixing the head-shaped end portion 25 of the bar arrangement portion 18 to a predetermined position (position of counterbore groove 29) on the enlarged-diameter side end fitting 24 is facilitated, and the time spent for this work can be greatly reduced, and the cost can be reduced. .

  The head-shaped end portion 25 of the tapered reinforcing bar portion 18 moved radially inward from the insertion hole 27 is fitted into a counterbored groove 29 formed on the outer surface side of the locking hole 28 of the enlarged-diameter side end fitting 24. As a result, it is possible to reliably prevent the head-like end portion 25 of the tapered reinforcing bar portion 18 fitted in the counterbore groove 29 from returning to the insertion hole 27 and coming off from the enlarged-diameter end face metal fitting 24.

  Of the inner and outer circumferences of the plurality of axial bars 16, the radial bending reaction force of the axial bars 16 acts on the side opposite to the radial bending reaction force, that is, the inner circumferential side of the tapered reinforcing bar 18. A ring-shaped jig main body 32 that can be freely attached, and a plurality of guide portions for positioning each of the tapered bar arrangement portions provided at the outer periphery of the bar arrangement portion 18 of the taper arrangement portion 18 of each axial direction reinforcement 16 33, the taper of each of the axial reinforcing bars 16 that is expanded in a taper shape toward the surface side of the concrete main body 12 by using the assembly jigs 31, 31a, 31b, 31c, 31d for reinforcing concrete products. The taper angle and the bar spacing of the bar-shaped reinforcing bar 18 can be held at a predetermined bar arrangement position, facilitating bar arrangement work in a predetermined shape, and in the axial direction in the fixing hole 26 of the enlarged diameter side end fitting 24. The work of aligning and fixing the tapered bar arrangement 18 of the streaks 16 can be facilitated. 31, 31a, 31b, 31c, 31d can be used to greatly reduce the mounting time of the diameter-expanded side end face bracket 24, save labor and time for bar arrangement work when manufacturing concrete products 11, and reduce costs. Can be planned.

  The jig main body 32 of the assembly jigs 31, 31a, 31b, 31c, 31d has a plurality of arc-shaped members 34 connected in a circular shape so that the diameter can be reduced or disassembled by a connecting member 35. In the state where the head-shaped end portion 25 is fixed to the enlarged-diameter side end fitting 24, the jig body 32 of the assembly jig 31, 31a, 31b, 31c, 31d is removed from the hollow portion of the ring-shaped enlarged-end end fitting 24. Compared to the case where a constant ring-shaped rebar is used for the enlarged diameter part 15 of the concrete body part 12, it can be removed by reducing the diameter or changing it to a compact size. Possible assembly jigs 31, 31a, 31b, 31c, 31d can be used repeatedly, and cost can be reduced.

  Next, concrete products 11a, 11b, 11c, and 11d of various modifications of the concrete product 11 according to the present invention will be described with reference to FIGS.

  FIG. 11 shows a concrete product 11a of the first modified example, which is different from the concrete product 11 shown in FIG. 1 in that the node portion 14 is not formed in the base tube portion 13 of the concrete main body portion 12, but the other structures are as follows. This is the same as the concrete product 11 shown in FIG.

  FIG. 12 shows a concrete product 11b of the second modification, in which the enlarged diameter portion 15 of the concrete main body 12 is formed in a tapered shape, and the surface of the enlarged diameter portion 15 and the tapered reinforcing bar portion 18 have a uniform thickness. 11 is different from the concrete product 11a shown in FIG. 11, but the other structure is the same as that of the concrete product 11a shown in FIG.

  FIG. 13 shows a concrete product 11c of the third modification, in which the enlarged diameter portion 15 of the concrete main body 12 is formed in a tapered shape, and the surface of the enlarged diameter portion 15 and the tapered reinforcing bar portion 18 have a uniform thickness. 12 is the same as the concrete product 11b shown in FIG. 12, except that the inner diameter portion 38 adjacent to the diameter-expanded side end fitting 24 of the diameter-expanded portion 15 is formed to have a larger diameter. This differs from the concrete product 11b shown in FIG. The inner diameter portion 38 is realized by inserting an annular dam plate into the mold during centrifugal molding.

  FIG. 14 shows a concrete product 11d of the fourth modification, which is shown in FIG. 11 in that the enlarged diameter portions 15a and 15b are integrally formed on both one end and the other end of the base tube portion 13 of the concrete main body portion 12. Although the structure is different from the concrete product 11a, the other structure is the same as the concrete product 11a shown in FIG. 11, and the bar arrangement structure and the concrete product applied to the enlarged diameter portion 15a at one end of the base tube portion 13. The assembly jig 31 for bar arrangement is also applied to the enlarged diameter portion 15b at the other end of the base tube portion 13.

  Next, FIG. 15 thru | or FIG. 17 shows other embodiment of the concrete product which concerns on this invention, the braiding method of the bar arrangement, and an assembly jig.

  A concrete product 11e shown in FIG. 15 is a concrete body in which a diameter-enlarged portion 15 having a larger outer peripheral side surface than the base tube portion 13 is formed integrally with at least one end of a tube-shaped base tube portion 13. Portion 12 and a straight bar arrangement portion 17 that is arranged at a predetermined pitch in the circumferential direction in the concrete main body portion 12 and is arranged in a straight shape in the base tube portion 13 and in the enlarged diameter portion 15 A plurality of axial reinforcing bars 16 having a tapered reinforcing bar 18 bent up from the straight reinforcing bar 17 and arranged in an expanded shape, and the straight reinforcing bar 17 in each axial reinforcing bar 16 And a ring bar 19 arranged on the outer peripheral side of the boundary position with the tapered bar arrangement part 18.

  Further, an inner ring bar 41 that is arranged on the inner peripheral side of the tapered bar arrangement part 18 in each of the axial direction bars 16, and the taper bar arrangement part 18 continuously through the inner ring bar 41. In addition, a large-diameter straight bar arrangement portion 42 arranged in a straight shape larger in diameter than the straight bar arrangement portion 17 is provided.

  Also, a plurality of fixing holes provided on the end surface of the base tube portion 13 of the concrete main body portion 12 and fixing the head-like end portions 22 provided at the end portions of the axial streaks 16 on the base tube portion 13 side. 23 is provided on the end surface of the ring-shaped base-side end metal fitting 21 formed at a predetermined pitch in the circumferential direction and the diameter-expanded portion 15 of the concrete main body portion 12, and the diameter-expanded portion 15 of each axial streak 16 is provided. A ring having an outer diameter and an inner diameter larger than those of the base tube side end fitting 21, in which a plurality of fixing holes 26 for fixing the head-shaped end portion 25 provided at the end on the side are formed at a predetermined pitch in the circumferential direction. And a large-diameter side end face metal fitting 24.

  The details of the base tube side end fitting 21 and the enlarged diameter side end fitting 24 are the same as those shown in FIGS. 2 to 5 and will not be described in detail.

  However, the fixing hole 26 of the diameter-expansion end metal fitting 24 may have the radial positional relationship between the insertion hole 27 and the locking hole 28 reversed from that shown in FIGS. That is, since the inner ring bar 41 is attached to the inner side in the radial direction of each axial bar 16 and each large-diameter straight bar arrangement part 42 is folded inward in the radial direction, Since the force acts radially outward, the locking hole 28 and the counterbore groove 29 may be disposed on the radially outer side of the insertion hole 27.

  As shown in FIG. 16, the method of braiding the concrete product 11e shown in FIG. 15 assembles the axial streak 16 and the circumferential streak 20 as shown in FIG. 16 (a), and FIG. 16 (b). As shown in Fig. 16, the base tube side end fitting 21 is attached, and the ring reinforcement 19 is attached to the outer peripheral side of each axial reinforcement 16, and as shown in FIG. The muscles 16 are bent outward, the inner ring muscles 41 are attached to the inner sides of the respective axial muscles 16, and the respective axial muscles 16 are bent inward with the inner ring muscle 41 as a fulcrum as shown in FIG. 16 (d). Each large-diameter straight bar arrangement portion 42 is formed back, and an assembly jig 31e for concrete product arrangement is detachably attached to the outer peripheral side of each large-diameter straight bar arrangement portion 42, and FIG. e) As shown in Fig. 4, after mounting the enlarged-side end fitting 24 on each axial streak 16, 31e remove or decompose to expanding the.

  FIG. 17 shows the assembly jig 31e used in FIG. 16 (d), and this assembly jig 31e is used to attach the enlarged-diameter side end fitting 24 to the axial streak of the inner and outer circumferences of the plurality of axial streaks 16. Round steel ring-shaped jig that is detachably attached to the side where the 16 radial bending reaction forces act and which opposes the radial bending reaction force, that is, the outer peripheral side of each large-diameter straight reinforcing bar 42 A plurality of guide portions 33 formed by welding a plurality of pairs of steel materials for positioning the large-diameter straight reinforcing bars 42 of the axial reinforcing bars 16 on the inner peripheral portion of the main body 32 are provided for each of the large-diameter straight reinforcing bars. There are 42 bar arrangement intervals.

  The jig body 32 is provided at two arcuate members 34 that can be connected in a circular shape, and at one end and the other end of each arcuate member 34. These arcuate members 34 are shown in FIG. As shown in FIG. 17, a bracket 35a and a pin 35b are provided as connecting members that are connected in a circle and can be disassembled or changed in diameter, that is, can be expanded as shown in FIG.

  Then, when removing the assembly jig 31e from the outer peripheral side of each large-diameter straight reinforcing bar 42, remove the pin 35b from at least one bracket 35a and expand around the other pin 35b, or It can be removed by removing the pins 35b from both brackets 35a and disassembling them. The assembly jig 31e is preferably attached near the tip of each large-diameter straight reinforcing bar 42, but it is difficult to remove the jig if it is located inside the circumferential plate 24b, so it is located outside the circumferential plate 24b. Attach to each large-diameter straight reinforcement bar 42.

  As described above, the radial bending reaction force of the axial reinforcement 16 acts on the inner and outer circumferences of the plurality of axial reinforcements 16 and is opposed to the radial bending reaction force, that is, the large-diameter straight reinforcing bar 42. A ring-shaped jig body 32 that is detachably attached to the outer peripheral side of each of the rods, and each axial streak positioning provided at the inner peripheral portion thereof by a bar spacing interval of the large-diameter straight bar arrangement portion 42 of each axial streak 16 Large-diameter straight reinforcement of each axial reinforcement 16 expanded to the surface side of the concrete body 12 by using an assembly jig 31e for concrete product reinforcement comprising a plurality of guide parts 33 for The portion 42 can be held at a predetermined bar arrangement position from the outer peripheral side thereof, facilitating the bar arrangement work in a predetermined shape, and each of the large axial stripes 16 in the fixing hole 26 of the enlarged diameter side end fitting 24. The work of aligning and fixing the straight radial bar arrangement part 42 can be done easily. By using the assembling jig 31e, it is possible to significantly reduce the mounting time of the diameter-expansion side end metal fitting 24, save labor and time for bar arrangement work when the concrete product 11 is manufactured, and reduce costs.

  In addition, the jig body 32 of the assembly jig 31e has a plurality of arc-shaped members 34 connected in a circular shape so as to be expandable or dismountable by brackets 35a and pins 35b. With the cylindrical end 25 fixed to the enlarged diameter side end fitting 24, the jig body 32 of the assembling jig 31e is changed in diameter or disassembled to be easily removed from the outer peripheral side of the large diameter straight reinforcing bar 42. Compared with the case where a fixed ring-shaped assembly rebar is used for the expanded diameter portion 15 of the concrete main body portion 12, the assembly jig 31e that can be attached and detached by expanding or disassembling can be used repeatedly, thereby reducing costs. Can be planned.

  In addition, also in the embodiment shown in FIG. 15, a modified example in which the node portion is not formed as shown in FIG. 11, or one end portion and the other end portion of the concrete main body portion 12 as shown in FIG. 14. A modified example in which the enlarged-diameter portion is integrally formed on both of these is established.

  Next, the present invention is applied not only to the illustrated ready-made concrete piles but also to concrete poles such as utility poles (not shown). In the concrete pole, from the prestressed concrete product after curing and demolding, at least one of the base tube side end fitting 21 and the enlarged diameter side end fitting 24 is a part of the concrete body 12 and a part of the axial reinforcement 16. In some cases, the final product may be cut off.

  In short, the concrete product 11 of the present invention includes those that are not provided with both the base cylinder side end fitting 21 and the enlarged diameter side end fitting 24, and the base cylinder side end fitting 21 and the enlarged side end fitting 24 are cut off. However, it is possible to provide the concrete product 11 such as a concrete pole that has been laid out so that more effective breaking strength can be obtained in the expanded diameter portion 15.

  INDUSTRIAL APPLICABILITY The present invention can be used in industries such as manufacturing industry, sales industry, and industrial engineering related to concrete products such as concrete piles or concrete poles.

11, 11a, 11b, 11c, 11d, 11e Concrete products
12 Concrete body
13 Base tube
15 Expanded part
16 axial streaks
17 Straight reinforcement
18 Tapered bar arrangement
19 Ring muscle
21 Base tube side end fitting
22 Head end
23 Fixing hole
24 Expanded side end fitting
25 Head end
26 Fixing hole
27 Insertion hole
28 Locking hole
29 counterbored grooves
31, 31a, 31b, 31c, 31d, 31e Assembly jig
32 Jig body
33 Guide section
34 Arc-shaped members
35, 35a, 35b Connecting member

Claims (6)

A concrete main body part integrally formed with a diameter-enlarged part formed on the outer peripheral side surface of the base cylinder part to have a larger diameter than the base cylinder part at least at one end of the cylindrical base part,
It is arranged at a predetermined pitch in the circumferential direction in the concrete main body part, and has a straight bar arrangement part arranged straight in the base tube part, and is bent up from the straight bar arrangement part in the enlarged diameter part. A plurality of axial streaks having tapered bar arrangements arranged in an expanded manner;
A concrete product comprising: a ring reinforcing bar arranged on an outer peripheral side of a boundary position between the straight reinforcing bar portion and the tapered reinforcing bar portion in each of the axial reinforcing bars. A plurality of fixing holes provided on an end surface of the base tube portion of the concrete main body portion and fixing a head-shaped end portion provided on an end portion of each axial streak on the base tube portion side at a predetermined pitch in the circumferential direction. A ring-shaped base tube side end fitting formed;
A plurality of fixing holes provided on an end face of the diameter-expanded portion of the concrete main body portion and fixing a head-shaped end portion provided on an end portion on the diameter-expanded portion side of each axial streak at a predetermined pitch in the circumferential direction. The concrete product according to claim 1, further comprising: a ring-shaped enlarged-side end metal fitting having a larger outer diameter and inner diameter than the base cylinder-side end metal fitting. The fixing hole of the above-mentioned enlarged diameter side end fitting is
An insertion hole formed in such a size that the head-like end of the axial muscle can be inserted;
It is continuously cut in the radial direction from the insertion hole, and the shaft portion of the axial streak can be inserted by moving in the radial direction from the insertion hole and has a smaller diameter than the head end of the axial streak. The concrete product according to claim 2, further comprising a locking hole. The diameter-expansion side end fitting is
4. The concrete according to claim 3, further comprising a counterbore groove formed on an outer surface side of the locking hole and fitted with a head-like end portion of the axial streak moved in the radial direction from the insertion hole. Product. An assembly jig for reinforcing concrete products used when molding the concrete product according to any one of claims 1 to 4,
5. The portion of the inner and outer circumferences of the plurality of axial streaks according to claim 1, wherein a radial bending reaction force of the axial strip acts and is detachable on a side opposing the radial bending reaction force. A ring-shaped jig body to be attached;
An assembly jig for reinforcing bar for concrete products, comprising: a plurality of guide portions that are provided in the jig main body at intervals of the bar arrangement of the axial bars to position the axis bars. The jig body is
A plurality of arc-shaped members connectable in a circular shape;
6. The assembly jig for reinforcing concrete products according to claim 5, further comprising a connecting member that connects the plurality of arcuate members in a circular shape so that the diameter of the arc-shaped members can be changed or disassembled.

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