Concrete pole

Abstract

To provide a concrete pole allowing attachment / detachment work of a protective socket protecting an earth line passing through a through-hole of a steel flange of the concrete pole to be easily and simply performed upon wiring the earth line on an outer periphery of the concrete pole, and safety for an earth line to be secured.SOLUTION: A protective socket 20 is configured to consecutively arrange a cylindrical through-hole protective member 11 on a lower surface 3 of a disk-like base 1 with a diameter D1 and thickness t1 having a through-hole 4 at a center. The thickness t1 of the base 1 is formed by such a thickness that a worker can pick with a fingertip. Annular projections 13, 13 with slight elasticity are provided on an outer circumference of the through-hole protective member 11 in two layers, one above the other, and the through-hole protective member 11 is used by being inserted in a cable through hole of a steel flange. A diameter D13 of the annular projection meets the following "diameter D11 of the through-hole protective member 11<diameter D13 of the annular projection<diameter D1 of the base."SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a concrete pole having a protective socket attached to a through hole through which a cable passes. [Background technology]

[0002] Conventionally, concrete poles of a desired length have been provided by connecting unit poles with steel flanges attached thereto (Patent Document 1). In addition, in the concrete pole, it was necessary to wire an electric cable such as an earth wire from the equipment installed at the top toward the ground. In addition, there were also cases where an electric cable was wired from equipment installed above ground or underground to the upper end of the concrete pole. In this case, the electric cable had to be placed inside the concrete pole as much as possible near the ground, and in the exposed part, it had to be placed along the length of the concrete pole. Therefore, if there was a flange for connection on the upper side of the concrete pole, it had to be penetrated. Therefore, there was a proposal to provide a resin protective pipe in the insertion notch of the steel flange (Patent Document 2). In this protective pipe, a thin protrusion was formed at the upper end of the straight body, an opening was formed in the straight body over the entire axial length, and the opening was bent to make it smaller and was in close contact with the insertion notch of the steel flange. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-101325 A [Patent Document 2] Utility Model Registration No. 3196083 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional protective pipe is structured to be inserted into the insertion notch of the steel flange, and in the type in which a through hole is formed in the steel flange to insert the earth wire, it is difficult to insert the protective pipe into the through hole. Also, depending on the diameter of the insertion notch and the diameter of the straight body part of the protective pipe, the insertion notch may remain open due to aging, etc., and the earth wire may come into contact with the steel flange through the insertion notch. Also, in the event of an unexpected situation such as a strong wind, the earth wire may come out of the insertion notch. [Means for solving the problem]

[0005] The present invention solves the above-mentioned problems by making the base of the protective socket thick enough for an operator to grasp it, making the penetration protection member cylindrical, and providing it with an annular protrusion.

[0006] In other words, this invention is a concrete pole characterized in that it is constructed by overlapping and connecting concrete unit poles having steel flanges attached to their connecting end faces, and by satisfying all of the following requirements. (1) With cable insertion hole piece "Lower steel flange of upper unit pole" With cable insertion hole piece "The upper steel flange of the lower unit pole" is connected to form a composite steel flange, and the composite steel flange is The two cable insertion hole pieces are aligned in a straight line. A communicating electrical cable insertion hole was formed. (2) A cylindrical protective socket through which an electric cable can pass is installed in the electric cable insertion hole. (3) The protective socket has an outer diameter D1 larger than the inner diameter D0 of the electric cable insertion hole, and is integrally formed with a through hole of diameter D2 on the underside of a base having a through hole of diameter D2, by forming a through protection member having an outer diameter D11 smaller than the inner diameter D0 of the electric cable insertion hole and an inner diameter D12 equal to the diameter D2. (4) An annular protrusion is formed on the outer surface of the penetration protection member so as to elastically abut against the wall surface of the electric cable insertion hole, and the lower end of the penetration protection member is positioned below the upper steel flange of the lower unit pole, The annular projections are disposed above and below the approximate center line of the penetration protection member in the longitudinal direction. (5) The base of the protective socket 2~30mm The through hole of the base is formed to have a thickness of 1 mm, and a tapered portion is formed at the upper edge of the through hole of the base so as to be gently continuous with the upper surface of the base. (6) The protective socket was positioned approximately at the center line near the boundary between the upper steel flange and the lower steel flange.

[0008] The thickness sufficient for an operator to grasp with his / her fingers is, for example, about 2 to 30 mm. Effect of the Invention

[0009] In this invention, the base of the protective socket is made thick enough that an operator can grasp it, which makes it easy and simple to insert and adjust the protective socket into the cable insertion hole in the steel flange of the concrete pole. In addition, the protective socket is equipped with a cylindrical penetration protection member and has a base with a larger diameter than the penetration protection member, so that the cable insertion hole in the steel flange is securely blocked and electrical cables such as the earth wire are prevented from coming into contact with the steel flange. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 shows a cable protection socket of the present invention, in which (a) is a plan view, (b) is a front view, (c) is a bottom view, and (d) is a longitudinal sectional view. [Diagram 2] FIG. 1 shows a concrete pole of the present invention, in which (a) is a front view and (b) is an enlarged view of part A. [Diagram 3] FIG. 2(b) shows an enlarged view of part B with a portion cut away. [Figure 4] 1(a) to 1(c) are front views showing the construction procedure of the concrete pole of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An embodiment of the present invention will be described with reference to the drawings.

[0012] 1. Configuration of Protective Socket 20

[0013] (1) A cylindrical through-hole protection member 11 with an outer diameter D11, an inner diameter D12, and a length L1 is continuously provided on the lower surface 3 of a disc-shaped base 1 with an outer diameter D1 and a thickness (height) t1 to form a protection socket 20.

[0014] (2) The base 1 is formed with a through-hole 4 having a diameter D2 (= D12) at approximately the center, and the upper edge of the through-hole 4 forms a tapered portion that gradually expands to reach the upper surface 2 of the base 1. Also, the thickness (height) t1 of the base 1 is formed to a size that can be grasped by an operator's finger. For example, it is formed to be about half of the outer diameter D11 of the through-hole protection member 11, but D11×(1 / 3) < t1 < D11×(2 / 3) forming it to this extent is sufficient. This is because if t1 is too short, it is difficult to grasp, and if it is too long, it is difficult to handle.

[0015] (3) For a cylindrical through-hole protection member 11 with an outer diameter D11 and an inner diameter D12, the axis 14 is arranged vertically, and annular protrusions 13, 13 having some elasticity are formed in four upper and lower stages on the outer periphery of the through-hole protection member 11. The annular protrusions 13, 13 are arranged in two upper and lower stages each with the central horizontal line 15 in the length direction of the through-hole protection member 11 as the boundary (Figure 1). Also, if the outer diameter of the annular protrusion is D13, then the outer diameter D11 of the through-hole protection member 11 < the outer diameter D13 of the annular protrusion < the outer diameter D1 of the base is formed.

[0016] (4) The protection socket having the above structure is integrally formed from a resin material having electrical insulation properties. The size of the protection socket can be configured in various sizes depending on the size of the Cable insertion hole 51 used, the thickness of the electrical cable, etc. For example, the outer diameter D1 of the base 1 = about 14 mm the outer diameter D11 of the through-hole protection member 11 = about 9 mm the inner diameter D12 of the through-hole protection member 11 = the through-hole D2 of the base 1 = about 7 mm the outer diameter D13 of the annular protrusion 13 = about 11 mm the length L1 of the through-hole protection member 11 = about 55 mm is formed (Figure 1).

[0017] 2. Concrete pole 50

[0018] (1) The concrete pole 50 is formed by connecting an upper unit pole 31 and a lower unit pole 41 (FIG. 2(a)).

[0019] (2) The upper unit pole 31 has a steel flange 34 with a thickness of t12 formed at the lower end of the hollow concrete section 32 made of concrete, and the upper unit pole 31 has a steel flange 34 with a thickness of t12 formed at the lower end of the hollow concrete section 32 made of concrete. The steel flange 34 has a diameter larger than the outer diameter of the hollow concrete section 32 made of concrete, and a cable insertion hole piece (insertion section) 37 with a diameter D0 is formed in the thickness direction of the steel flange 34 near the outer periphery 35 (Fig. 2(b)), Fig. 3). Furthermore, the lower unit pole 41 has a steel flange 44 with a thickness of t11 formed at the upper end of the hollow concrete section 42 made of concrete. The steel flange 44 has a diameter larger than the outer diameter of the hollow concrete section 42 made of concrete, and a cable insertion hole piece (insertion section) 47 with a diameter D0 is formed in the thickness direction of the steel flange 44 near the outer periphery 45 (Fig. 2(b)), Fig. 3).

[0020] (3) The two steel flanges 34, 44 have the same outer and inner diameters, and are joined together to form an assembled steel flange 52 (FIG. 2(a)). Cable insertion hole piece 37 and 47 are connected in a straight line, Cable insertion hole 51 (FIG. 2(b)). In addition, if the thickness of the assembled steel flange 52 is t0, t0=t11+t12 This results in (Figure 3).

[0021] (4) Cable insertion hole 51 (cable insertion hole pieces 37, 47) has a diameter D0 (FIG. 3). Outer diameter D11 of the penetration protection member 11 of the protection socket 20 <D0 The outer diameter D1 of the base 1 of the protective socket 20>D0 The steel flange 52 has a thickness t0, and the length L1 of the penetration protection member 11 of the protection socket 20 is t0=(t1+t2) <L1 (Figure 1(b)(d)).

[0022] 3. Installation of protective socket 20 on concrete pole 50

[0023] (1) A concrete pole 50 is typically constructed as follows (Figure 4).

[0024] (2) The lower end of the lower unit pole 41 is buried in the ground 55, and the upper unit pole 31 is positioned above the lower unit pole 41 from above, and then lowered (FIG. 4(a)). In this state, the middle portion of the earth wire 54 is located in the hollow portion 43 of the hollow concrete portion 42 of the lower unit pole 41, and the lower end portion of the earth wire 54 is located from the lower horizontal hole 48a of the hollow concrete portion 42 to the outside of the hollow concrete portion 42 and is located underground and earthed (FIG. 4(a)). In addition, the upper end portion of the earth wire 54 is located from the upper horizontal hole 48 of the hollow concrete portion 42 to the outside of the hollow concrete portion 42 and is hanging down outside the hollow concrete portion 42 (FIG. 4(a)).

[0025] (3) The steel flange 44 of the lower unit pole 41 and the steel flange 34 of the upper unit pole 41 are connected to form a concrete pole 50 (Fig. 4(b), Fig. 2(a)). In this state, the steel flanges 34, 44 are assembled to form a steel flange 52. In this state, the cable insertion hole piece 37 of the steel flange 34 and the cable insertion hole piece 37 of the steel flange 34 are vertically connected to each other, Cable insertion hole 51 (FIG. 4(b), FIG. 2(a)). Next, the assembled steel flange 52 Cable insertion hole 51 The protective socket 20 is inserted from above into the cable insertion hole pieces 37, 47. At this time, the base 1 of the protective socket 20 is held, and the tip 11a of the penetration protection member 11 is inserted into the protective socket 20 from above. Cable insertion hole 51Since the protective socket 20 is inserted into the base 1, it is easy to pick up the protective socket 20 and to push the protective socket 20 in by picking up the base 1. In addition, at this time, the length L1 of the penetration protection member 11 of the protection socket 20 is t0 <L1 Therefore, when the lower surface 3 of the base 1 of the protective socket 20 is in contact with the assembled steel flange 52 (steel flange 43), the lower end 11a of the penetration protection member 11 passes through the assembled steel flange 52 (steel flange 44) and is positioned downward (FIG. 3, FIG. 1(d)). Cable insertion hole 51 The entire inner wall of the cable insertion hole pieces 37, 47 is covered with the penetration protection member 11. In this case, the outer diameter D13 of the annular projection 13 of the protective socket is Cable insertion hole 51 The cable insertion hole pieces 37, 47 are formed to have a size such that they elastically contact the inner walls of the cable insertion hole pieces 37, 47. D0≦D13 It is as follows.

[0026] (4) In addition, at this time, the approximate center line 15 of the protective socket 20 is located near the boundary between the steel flanges 34, 44, and the annular projections 13, 13 are in contact with the cable Through hole piece The annular projections 13, 13 are arranged at equal intervals on each of the cables 37 and 47. Insertion hole pieces 37, 47 Since the protective socket 20 elastically abuts against the inner wall of the cable through-hole pieces 37, 47, the protective socket 20 is positioned approximately at the center in the axial direction of the cable through-hole pieces 37, 47. In addition, the protective socket 20 Cable insertion hole 51 (Cable insertion hole pieces 37, 47) are inserted halfway and held, then Cable insertion hole 51 (cable insertion hole pieces 37, 47) or 51 When pulling out the cable from the cable insertion hole pieces 37, 47, the work can be easily performed by grasping the base 1. Similarly, when pulling out or replacing the concrete pole 50, the work can be easily performed by grasping the base 1.

[0027] (5) Next, connect the upper end of the earth wire 54 to the lower end 11a of the protective socket 20 and the protective socket 20 ( Cable insertion hole51) and pulled out above the base 1 of the protective socket 20. The upper end of the pulled out earth wire 54 is placed along the outer periphery of the upper unit pole 31 (FIG. 4(c)). The earth wire is connected to equipment (not shown) to be installed at the upper end of the concrete pole 50 (the top of the upper unit pole 31). At this time, the earth wire 54 passes through the cable insertion hole 51 of the assembled steel flange 52, but the entire inner surface of the cable insertion hole 51 is covered by the protective socket 20, and in particular the opening at the upper edge is covered by the base 1. The opening edge at the lower end is covered by the lower end 11a protruding downward from the penetration protection member 1, so that the earth wire 54 does not come into contact with the assembled steel flange 52. In addition, the lower surface 3 of the base 1 of the protective socket 20 closes the upper end of the cable insertion hole 51, and the annular projections 13, 13 of the protective socket 20 are So, The cable insertion hole 51 can be sealed almost watertight. Normally, the inner surfaces of the steel flanges 34, 44 are provided with a protective coating (such as plating), but this can be used to deal with any deterioration that may occur over time.

[0028] (6) In addition, in FIG. 4(b)(c), the assembled steel flange 52 Cable insertion hole After attaching the protective socket 20 to the protective socket 20, the earth wire 54 was inserted into the protective socket 20. Cable insertion hole The earth wire is passed from the bottom to the top of 51, and the lower end 11a of the protective socket 20 is placed over the top end of the earth wire 54. The protective socket 20 is then assembled from above to the steel flange 52. Cable insertion hole 51 (through which the earth wire 54 is inserted) (not shown).

[0029] (7) In the above, the concrete pole 50 is composed of the upper unit pole 31 and the lower unit pole 41, but it is also possible to use one or more intermediate unit poles with steel flanges attached to the top and bottom between the upper unit pole 31 and the lower unit pole 41 in combination (not shown). In this case, cable insertion hole pieces are also formed in the top and bottom steel flanges of the intermediate unit pole in the same way. Moreover, in the above, the earth wire 54 is used, but the protective socket 20 can also be applied to the cable insertion hole of the assembled steel flange 52 for other electric cables (not shown).

[0030] 4. Other embodiments

[0031] (1) In the above embodiment, the protective socket 20 has four stages of annular protrusions 13, but it is preferable to provide at least two stages, one on each side of the approximate center line 15. Although the effect is weakened, it is sufficient to form at least one annular protrusion 13 (not shown).

[0032] (2) In the above embodiment, the cable insertion hole pieces 37, 47 are formed in the steel flanges 34, 44. However, instead of the cable insertion hole pieces 37, 47, a notch can be formed from the outer periphery 35, 45 side of the steel flanges 34, 44 to the position of the cable insertion hole pieces 37, 47 (not shown). In this case, the protective socket 20 can also be used. [Explanation of symbols]

[0033] 1 base 2 Top surface of base 3 Underside of base 4 Base through hole 11 Penetration protection member 11a Tip of the penetration protection member 12 Hollow portion of penetration protection member 13 Annular projection of penetration protection member 14 Axis of penetration protection member 15 Approximate center horizontal line of penetration protection member 20 Protective Socket 31 Upper Unit Pole 32 Hollow concrete section of upper unit pole 34 Steel flange of upper unit pole 37 Cable insertion hole piece of steel flange of upper unit pole 41 Lower Unit Pole 42 Hollow concrete section of lower unit pole 44 Steel flange of lower unit pole 47 Cable insertion hole piece of steel flange of lower unit pole 48 Upper horizontal hole of lower unit pole 48a Lower horizontal hole of lower unit pole 50 Concrete Pole 51 Cable insertion hole 52 Braided steel flanges 54 Earth wire (electrical cable) 55 Ground

Claims

[Claim 1] This concrete pole is characterized in that it is constructed by overlapping and connecting concrete unit poles having steel flanges attached to their connecting end faces, and by satisfying all of the following requirements: (1) A "lower steel flange of the upper unit pole" having a cable insertion hole piece and an "upper steel flange of the lower unit pole" having a cable insertion hole piece are connected to form an assembled steel flange, and an electric cable insertion hole is formed in the assembled steel flange, in which both cable insertion hole pieces are connected in a linear manner. (2) A cylindrical protective socket through which an electric cable can be passed is installed in the electric cable insertion hole. (3) The protective socket has an outer diameter D1 larger than the inner diameter D0 of the electric cable insertion hole, and is formed integrally with a through hole of diameter D2 on the underside of a base by forming a through protection member having an outer diameter D11 smaller than the inner diameter D0 of the electric cable insertion hole and an inner diameter D12 the same as the diameter D2. (4) An annular protrusion is formed on the outer surface of the penetration protection member so as to elastically abut against the wall surface of the electric cable insertion hole, and the lower end of the penetration protection member is positioned below the upper steel flange of the lower unit pole, and the annular protrusions are arranged above and below the approximate center line of the longitudinal direction of the penetration protection member. (5) The base of the protective socket is formed to a thickness of 2 to 30 mm, and a tapered portion that is gently continuous with the upper surface of the base is formed at the upper edge of the through hole of the base. (6) The protective socket was positioned approximately at the center line near the boundary between the upper steel flange and the lower steel flange.

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