JP6616636B2 - Concrete pole - Google Patents

Description

  The present invention relates to a concrete pole used for a utility pole or the like.

  Concrete poles are used for poles for bridging electric wires and telephone lines, and poles for ball-proof nets. Conventionally, the PC steel axial rebar and auxiliary axial rebar are annularly arranged over the entire length, and a normal steel wire helical rebar is wound around the axial rebar as an assembly reinforcement, and the outer periphery of the concrete is surrounded by concrete. A hollow concrete pole molded in is used. In order to increase the strength of the concrete pole wound with this spiral bar, the concrete pole becomes larger in diameter to increase the thickness of the concrete or to increase the cross-sectional area of the axial rebar. Has the disadvantage of increasing.

  Accordingly, the present applicant has proposed a concrete pole that can improve the strength without increasing the diameter of the concrete pole (see Patent Document 1). Moreover, the ring reinforcement | strengthening assembly apparatus for assembling the ring reinforcement was also proposed (refer patent document 2).

  FIG. 8 shows a concrete pole described in the above-mentioned Patent Document 1. This concrete pole 1 is composed of an axial rebar 2 covering the entire length, an auxiliary axial rebar 3 having a length up to the middle of the pole, and axial rebars 2 and 3. Is composed of a normal steel wire spiral bar 4, a carbon steel or high-strength steel strip bar 5, a high-strength steel ring bar 6, and centrifugally formed concrete 8.

  By arranging the strip reinforcing bars 5 and the ring reinforcing bars 6 in the portions where the bending moment is large, the lateral restraint of the concrete pole is strengthened, and the buckling of the axial reinforcing bars 2 and 3 is delayed.

  As a result, the performance of the axial rebars 2 and 3 can be fully exploited, and the strength of the concrete pole can be improved without increasing the diameter of the concrete pole by improving the toughness and energy absorption capacity. It became possible to provide concrete poles.

  Further, in the ring rebar assembly device described in Patent Document 2, a plurality of ring rebar placement devices and a plurality of spacer receiving devices are alternately disposed at predetermined positions, and spiral rebar coil moving devices are disposed at both ends. This makes it easier to assemble the muscles.

JP-A-9-273333 Japanese Patent Laid-Open No. 10-52815

  However, since the ring reinforcement used in the concrete poles of Patent Documents 1 and 2 is circular, in addition to the ring reinforcement assembly device, a ring reinforcement molding machine before ring assembly, a ring end welding apparatus, and the like are available. Not only is this necessary, but since the outer dimensions of all ring bars are different, there is a problem that it takes time to adjust the ring molding machine, weld the ring end, and sort the ring outer diameter.

  Also, in the rebar assembling process, the strip rebar and ring rebar are circular and do not stand independently, so a dedicated stand is installed and the required number is placed on it, and the band rebar or ring rebar and the axial rebar are integrated with the rebar. It took time because there was assembly work to bind, and there was a problem in production efficiency because a separate assembly space was required.

  Therefore, the present invention economically provides a concrete pole having high strength that can be easily assembled without using a ring line and without increasing the diameter of the concrete pole.

In the invention of claim 1 of the present application, axial rebars are annularly arranged in the axial direction at intervals, and the spiral rebars are spirally wound around the axial rebar from the original opening portion to the end opening portion. In the concrete poles of the above, a high-strength wire helical rod that withstands the bending moment is wound around the intermediate portion excluding the front end portion and the upper end portion below the ground level where the bending moment is large outside the axial reinforcing bar. The spiral bars of the high-strength steel wire in the intermediate part are wound at intervals of 50 mm or less, and the spiral bars of the high-tensile steel wire or the ordinary steel wire are wound at intervals of 100 mm or less in the other parts. It is a featured concrete pole.

  In manufacturing the concrete pole of the present invention, it is not necessary to individually process the ring bars by making the lateral restraint bars into the spiral bars of the high-strength steel wire, and it can be continuously arranged with the same material. It can be shortened.

  The concrete pole of the present invention uses a high-strength wire spiral bar as a lateral restraint bar at a portion where the bending moment of the high-strength steel wire spiral bar is large, and the high-strength steel wire spiral bar is wound at intervals of 50 mm or less. The other parts are wound at intervals of 100 mm or less, so that the toughness and concrete absorption capacity are improved and the strength of the concrete pole is improved compared to a concrete pole provided with a rough spacing as a conventional ordinary reinforcing bar. It became possible to provide economical concrete poles.

  The concrete pole of the present invention can have the same performance as the concrete pole provided with the ring streaks of Patent Document 1.

  In the concrete pole of the present invention, since the spiral bars of the high-strength steel wire are not individually independent, the work of arranging the ring bars is unnecessary, and it is not necessary to bind the whole number. It can be assembled by a conventional method in the same manner as the spiral line, and can provide a more economical pole than the concrete pole provided with the ring of Patent Document 1.

It is a schematic diagram of the concrete pole of this invention. It is a schematic diagram of the concrete pole which combined the high-tension spiral bar | burr 7 and the normal spiral bar | burr 4 of this invention. It is the schematic diagram of another Example of the concrete pole which combined the high tension | tensile_strength helical muscle 7 and the normal helical reinforcement 4 of this invention. It is the schematic diagram of the Example which combined the high tension | tensile_strength helical muscle 7 of this invention with different winding space | intervals. It is the schematic diagram of the Example which wound the high tension | tensile_strength helical muscle 7 of this invention to the full length with the space | interval of 50 mm or less. It is a figure which shows the relationship between a breaking load and a maximum deflection. It is a figure which shows the relationship between a breaking load and a maximum deflection. It is a schematic diagram of the concrete pole of patent document 1. FIG.

  FIG. 1 is a schematic view of a concrete pole of the present invention in which the strip reinforcing bars 5 and ring bars 6 shown in FIG. 8 are replaced with high-strength helical bars 7 of hard steel wire. Is the same as the conventional one, but the portion with a large bending moment around the axial rebars 2 and 3 is wound with a high-tensile spiral bar 7 at intervals of 50 mm or less, and the other portions at intervals of 100 mm or less. Yes.

PC steel is used for the axial rebar and auxiliary axial rebar as in the case of conventional concrete poles. A high strength steel wire (for example, JIS G 3521, JIS G 3522) having a tensile strength of 800 N / mm ² or more is used for the helical muscle. The wire diameter is 2.0 to 5.0 mm.

  For portions other than the intermediate portion, high-tensile steel wire or ordinary steel wire can be appropriately used as in the conventional case.

  In FIG. 2, the spiral bars 4 are normally arranged at the end portion where the bending moment is small and the original mouth portion buried in the ground, with the portion where the bending moment is large at intervals of 50 mm or less, and the other portions are high at intervals of 100 mm or less. This is an embodiment in which a tension spiral muscle 7 is wound.

  FIG. 3 shows an example in which the normal spiral bars 4 are arranged at the end part where the bending moment is small and the original part embedded in the ground, and the high tension spiral bars 7 are wound at intervals of 50 mm or less in all other parts.

  FIG. 4 shows an example in which high-tensile spiral bars 7 having different winding intervals are combined depending on the magnitude of the bending moment. This is an example in which the strength is adjusted by winding at intervals of 50 mm or less near the ground line and winding at a plurality of intervals of 100 mm or less toward the end.

  FIG. 5 shows an example in which the high-strength helical muscle 7 is wound at an interval of 50 mm or less over the entire length.

  In the case of a concrete pole having a design load of 10 kN in a length of 15 m, both the patent document 1 and the present invention can reduce the amount of reinforcing bars and the amount of concrete and increase the breaking load, the maximum deflection, and the energy absorption capacity compared to the conventional concrete pole. Is shown in Table 1 and FIG.

In this example, the energy absorption capacity is slightly larger than that of Patent Document 1, and the maximum deflection is slightly smaller, but the performance is the same because the breaking load is the same, and considering the rebar assembly process, it is economical. Are better.

  In the case of a concrete pole with a design load of 20kN with a length of 15m, the amount of concrete is almost the same. However, both Patent Document 1 and the present invention can reduce the amount of reinforcing bars compared to the conventional concrete pole, and the breaking load, maximum deflection, energy. Increasing the absorption capacity is shown in Table 2 and FIG.

Although this example also has the maximum deflection from Patent Document 1 and the energy absorption capability is reduced, the performance is equivalent because the breaking load is the same, and it is excellent in economy considering the rebar assembly process.

DESCRIPTION OF SYMBOLS 1 Concrete pole 2 Axial reinforcement 3 Auxiliary axial reinforcement 4 Normal spiral reinforcement 5 Strip reinforcement 6 Ring reinforcement 7 High tension spiral reinforcement 8 Concrete

Claims (1)

In a hollow concrete pole in which axial rebars are arranged annularly at intervals in the axial direction, and the helical rebars are spirally wound around the axial rebar from the original opening part to the end opening part, the axial direction On the outside of the rebar, a spiral wire of a high tension wire that can withstand the bending moment is wound around an intermediate portion excluding the base portion below the ground level and the upper end portion above the ground level where the bending moment is large. A concrete pole characterized in that a spiral wire of a steel wire is wound at intervals of 50 mm or less, and a spiral rod of a high-strength steel wire or a normal steel wire is wound at intervals of 100 mm or less in other portions .