JP2012055121A - Columnar upright body with snake climb preventing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a columnar upright body with snake climb preventing function which can effectively prevent a snake from climbing without using an adhesive material or a repellent by only a physical structure, and can also prevent a snake from climbing without a necessity of additionally installing a net-shaped material to an electric pole.SOLUTION: An inverted truncated cone part 3 is integrally installed around the outer circumferential wall of a columnar upright body (electric pole 1) in a manner that the cone part 3 has a conical tapered part 4 whose distance from the axial core S of the columnar upright body becomes longer as it goes toward upward, and whose longitudinal side is inclined downward with respect to a horizontal line. The inverted truncated cone part 3 is formed upward from the surface of ground, with its upper surface inclined so as to become lower toward external direction with respect to a horizontal line.

Description

  The present invention relates to a columnar standing body such as a utility pole having a function of preventing a snake from climbing.

  When a snake climbs a power pole aiming at an egg or chick in the nest of the upper part of the power pole, and touches the power transmission line or distribution line at that time, a ground fault occurs and a huge amount of power facilities or power supply destinations etc. There is a risk of damage. For this reason, development of an effective device for preventing snake climbing is required, and various snake climbing preventing devices have been studied in the past.

  For example, in Patent Document 1 described below, an anti-climbing tool in which an adhesive tape for preventing snake damage is attached to the surface of a utility pole in a circular shape and is further formed in a bowl shape at a position above the adhesive tape for preventing snake damage. And a device for preventing an accident caused by a small animal such as a snake or a barb climbing up and coming into contact with a transmission / distribution line or the like is disclosed.

  Further, in Patent Document 2 described below, a net-like material is constituted by a wire having a circular cross section and a smooth surface, and the wire constituting the net-like material is made of metal or synthetic resin and has a thickness of 0. 0. 5 to 2.5 mm, mesh mesh of 3 to 8 mm, and by winding this around the utility pole, many belly scales covering the snake body surface are not caught, and the body is S-shaped A configuration is disclosed in which the body cannot be stretched between the pressing plate and the protrusions by being bent into a mold, and further, the central part of the abdomen is recessed so that it cannot be used as a suction cup.

JP-A-5-231044 Utility Model Registration No. 3073585

  However, in the former configuration, since the snake damage prevention adhesive tape is adhered around the utility pole, it peels off when exposed to wind and rain for a long time and cannot be reused once peeled off. And the repellent of the adhesive tape for snake damage prevention cannot maintain an effect over many years.

  In addition, the climbing prevention device is shaped like a kite, so it is easily affected by typhoons and other gusts due to its structure, and may be damaged. There is concern about the danger of being hit and injured.

In the latter configuration, the net is wound around the utility pole, but the utility pole has a band for fixing the grounding wire and scaffolding bolt, etc., so it is difficult to attach it closely to the utility pole. In the case of mounting so as to cover these grounding wires and the like, there is a disadvantage that irregularities are formed on the surface of the net-like material, and a state in which the snake can climb is formed.
Moreover, since the net-like material is made of metal and is heavy and cannot be folded, there is a disadvantage that it is not easily transported and cannot be easily attached to the utility pole. Furthermore, since the net-like material is wound around the utility pole, it becomes a hindrance during the lifting and lowering pole during work.

  The present invention has been made in view of such circumstances, and solves the above-mentioned disadvantages caused by the need for a material different from the utility pole, and only uses a physical structure without using an adhesive or a repellent. A columnar standing body with a snake climbing prevention function that can effectively prevent snake climbing and can prevent snake climbing without attaching a net or the like to a utility pole later. This is the main issue.

Incidentally, snakes are generally known to have climbing habits as shown in the attached table of FIG.
That is, the snake
(1) If the central axis of the columnar standing body is tilted to some extent forward with respect to the direction of gravity, it is possible to climb the column. On the other hand, if it is tilted backwards to some extent (if it is tilted so that the back of the snake is on the lower side), it cannot climb up.
(2) When the lifting brackets adjacent to the upper and lower sides of the utility pole are attached obliquely, the body is hooked and fixed on the lower lifting bracket, and the head is extended diagonally above the lifting bracket. When the head reaches the lifting bracket, the body on the head side is hooked and fixed on the lifting bracket, the lower body is pulled up, and thereafter the movement is repeated to climb the utility pole.
(3) When the lifting brackets adjacent to the top and bottom of the utility pole are mounted on the vertical line, the snake that arrives at the lower lifting bracket will be hooked and fixed on the lifting bracket, and lifted in the upward direction. Extend the head to the bracket. At this time, the snake hooks the belly scales (belly plate) on the fine irregularities on the surface of the utility pole while meandering, gradually extending the bent body, and if the head reaches the next lifting bracket, The body is hooked and fixed on the lifting bracket, the lower body is pulled up, and thereafter, the exercise is repeated to climb the utility pole.
(4) Hook a large number of belly scales (abdominal plates) covering the surface of the snake on a large number of protrusions on the wall surface, and use it as a support. In addition, an abdominal scale (abdominal plate) cannot be engaged with a fine spherical projection having a diameter of about 0.05 to 1 [mm].
(5) Climb a long torso by bending it into an S-shape and supporting the body by stretching the body between the protrusions on the wall.
(6) Climb while supporting the body by sinking the center of the abdomen into a sucker shape.

  The present inventor, after grasping such a snake climbing habit, the structure of a columnar standing body that can effectively prevent the snake climb only by a physical static structure without using an adhesive or a repellent In order to prevent the climbing of the snake, as a result of intensive research on the above, if one of the measures (1) shown in the attached table of FIG. 4 or the measures covering (2) to (6) is taken, As a result of finding the knowledge that snake climbing prevention can be achieved and studying the countermeasure (1) among them, the present invention has been completed.

  That is, the columnar erected body with a snake climbing preventing function according to the present invention has a longer distance from the axis of the columnar erected body as it goes upward on the outer peripheral wall of the columnar erected body, and the vertical line is horizontal. On the other hand, an inverted truncated cone portion having a conical taper inclined downward is integrally provided.

  Therefore, an inverted cone provided with a conical taper on the outer peripheral surface of the columnar standing body, the distance from the axis of the columnar standing body becomes longer as it goes upward, and the perpendicular is inclined downward with respect to the horizontal. Since the pedestal is provided integrally, the measure against the above (1) is taken, and it is possible to effectively prevent the climbing of the snake by such a physical structure.

By the way, when such an inverted truncated cone part is provided, it is necessary not to impair the strength of the columnar standing body. Therefore, as a result of repeated examination of the position where the inverted truncated cone part is provided,
(i) When the inverted truncated cone part is provided from above the ground, the force applied to the ground of the power pole increases and the safety factor decreases.
(ii) If an inverted frustoconical part is provided from below the ground and the ground height of the inverted frustoconical part is the same, the amount of concrete used will increase, and the force applied to the ground will increase, resulting in safety. The rate is small,
(iii) In addition, the strength of the utility pole is calculated by dividing the allowable bending stress by the sum of the vertical load and bending moment at the ground, so if an inverted truncated cone portion is provided from the ground, the existing allowable Since bending stress can be adopted, strength calculation is simplified and it is easy to confirm whether sufficient strength is obtained.
For reasons such as this, it has been found that it is more desirable to form the inverted truncated cone part upward from the ground.

  Further, in order to prevent rainwater from collecting on the upper surface of the inverted truncated cone, the upper surface of the inverted truncated cone part may be inclined with respect to the horizontal so as to become lower toward the outside.

  In addition, when manufacturing such a column-like standing body integrally with a concrete with an inverted truncated cone part, a rebar cage is braided by an automatic braiding machine (steel wire assembling process), and the assembled steel wire is turned into an inverted truncated cone part. And the main body of the columnar standing body are put into a formwork for integrally molding (formwork assembly process), and then the steel wire in the formwork is tensioned by a tensioning machine (steel wire tensioning process), and the steel wire enters. Concrete is poured into the formwork (concrete pouring process), and the formwork after pouring the concrete is rotated with a centrifuge to compact the concrete (centrifugal compaction process). Release the pre-stress to the product, take out the product from the formwork (demolding (pre-stress introduction) process), using the existing method of manufacturing the columnar structure (electric pole), reverse to the formwork There will be a bulge to form the truncated cone Better to.

  As described above, according to the columnar standing body with a function of preventing snake climbing according to the present invention, the distance from the axial center of the columnar standing body becomes longer toward the outer peripheral wall of the columnar standing body, In addition, the inverted frustoconical part with a conical taper whose vertical line is inclined downward with respect to the horizontal is integrally provided, so that climbing to a snake columnar standing body can be effectively prevented with only a physical structure. It becomes possible to do. This eliminates the need for adhesives and repellents, making it superior in durability and durability, and eliminating the need for other materials such as a net. There is no need for the work to be held, and there is no need to be bothered by such work.

  In addition, if the inverted truncated cone part is configured to form upward from the ground, the strength management of the columnar standing body is facilitated, and the upper surface of the inverted truncated cone part is inclined with respect to the horizontal, There is no inconvenience that rainwater accumulates on the upper surface of the inverted truncated cone part.

FIG. 1 is a perspective view showing a columnar standing body (electric pole) with a snake climbing prevention function according to the present invention. FIG. 2A is a side view showing the entire configuration of a columnar standing body (electric pole) with a snake climbing prevention function according to the present invention, and FIG. 2B is a diagram of a portion where an inverted truncated cone portion is provided. It is an expanded sectional view. FIG. 3 is a block diagram illustrating a method for manufacturing a columnar standing body (electric pole) with a snake climbing prevention function. FIG. 4 is a table explaining the snake climbing movement.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a columnar standing body with a snake climbing prevention function according to the present invention will be described with reference to the accompanying drawings. In this example, as a columnar standing body with a snake climbing prevention function, a power pole 1 which is a concrete pillar of a transmission line or a distribution line is taken as an example, and a snake has a body length of 2 m and a rising ability of 3/4 (1.5 m ).

  1 and 2, the utility pole 1 is configured by integrally forming an inverted truncated cone portion 3 made of concrete on the side surface of a utility pole body 2 made of concrete.

  The inverted truncated cone portion 3 is provided over the entire circumference of the outer periphery of the utility pole body 2 from the ground (GL) of the utility pole 1 to a predetermined height, and the axial center of the utility pole 1 as it goes upward. It has a conical taper 4 whose distance from S becomes longer and whose perpendicular is inclined downward with respect to the horizontal.

  In this example, the inverted truncated cone portion 3 has a vertical length (H) in the concrete pillar shown in FIG. 2 (outside diameter D0 = 0.345 m, inside diameter D0 ′ = 0.261 m). For example, in the case of the utility pole 1 whose outer peripheral surface has a taper angle of 1/75 and approaches the central axis S, 3/75 outward so as to move away from the central axis S. A conical taper 4 is formed so as to project at a taper angle of. The conical taper 4 is formed on a smooth surface with no irregularities on the surface, and no water drain hole is formed in the inverted truncated cone portion 3.

Moreover, the inclined surface 7 which inclines so that it may be located below as it goes to the outer side is formed in the upper surface of the inverted truncated cone part 3, and rain water does not accumulate on the upper surface of the inverted truncated cone part 3.
Further, the conical taper 4 is formed with a bolt insertion hole 8 so that a scaffolding bolt can be attached if necessary, and if it is necessary to lay a ground wire from above the utility pole 1 to the ground, It is laid along the surface of the inverted truncated cone part 3.

  In order to manufacture the utility pole 1 provided with the above inverted truncated cone part 3, as shown in FIG. 3, the inverted truncated cone part 3 and the utility pole body 2 are integrally formed of concrete so as to be formed. 2 is formed in advance, and a reinforcing bar 12 for reinforcing an electric pole is braided by an automatic braiding machine 13 (steel wire assembling step).

  Then, the two divided molds are combined so as to sandwich the assembled reinforcing reinforcing bars 12 (mold forming process), and then the reinforcing reinforcing bars 12 in the mold are tensioned in the tensioning machine 14 (steel wire tensioning process). ). Thereafter, concrete is poured into the mold 11 from the concrete pump 15 into the mold 11 containing the reinforcing reinforcing bars 12 (concrete pouring process), and the mold 11 after the concrete is poured is rotated by a centrifuge 16 to rotate the concrete. If it is compacted (centrifugal compaction process), then the tension of the reinforcing bars is released, prestress is introduced into the product, and the utility pole 1 is taken out from the mold 11 (demolding process). The manufacture of the utility pole 1 in which the part 3 is integrally formed is completed.

Therefore, according to the above-described configuration, the inverted truncated cone portion 3 in which the conical taper 4 is formed from the ground (GL) is formed integrally with the utility pole body 2, so that the climbing of the snake is prevented only by the physical structure. It is possible to provide a function and to effectively prevent the snake from climbing to the utility pole 1. That is, according to the electric pole 1 as described above, the conical taper 4 formed on the outer peripheral surface of the inverted truncated cone part 3 is provided so that its perpendicular is inclined downward with respect to the horizontal. Measures against (1) are taken, and when a snake tries to climb, the back of the snake will be directed downward, and it will be possible to prevent the snake from climbing.
This eliminates the need for adhesives and repellents to be applied to the conical taper, making it superior in durability and durability, and eliminating the need for other materials such as a net, so installation work on a utility pole If it becomes unnecessary and the electric pole is erected, a snake climbing prevention structure is formed at the same time.

Moreover, since the inverted truncated cone part is formed toward the upper side from the ground, the strength management of the utility pole 1 is facilitated, and the strength can be prevented from decreasing.
Actually, it is assumed that the inverted truncated cone part 3 having the following dimensions is formed from the ground toward the upper side using a B-shaped concrete column, and this inverted truncated cone part 3 is not provided. When the bending stress (vertical load + bending moment) when the portion 3 is provided is compared, the results are shown in Table 1.

<Detailed dimensions of the inverted truncated cone part 3>
Height of inverted truncated cone part: H = 2.25m
The outer diameter of the utility pole on the ground: D0 = 0.345m
The inner diameter of the utility pole on the ground: D0 '= 0.261m
Outer diameter of the pole at the upper end of the inverted truncated cone part: D3 = 0.285m
The inner diameter of the utility pole in the inverted truncated cone part: D3 ′ = 0.201m
Outer diameter of the inverted truncated cone part: D4 = 0.525m

As can be seen from this result, by providing the inverted truncated cone part 3, the vertical load is increased by 0.3 (N / mm ² ) (about 27% increase), and the bending moment is 0.4 (N / mm ² ) (approx. 2% increase) and 0.7 (N / mm ² ) in total (approx. 4% increase). The rate of increase in bending stress (perpendicular load + bending moment) due to this shape change to the allowable bending stress is about 4%, and the rate of bending stress due to shape change is about 77% of the allowable bending stress ( 100 × 18.9 / 24.5) with a tolerance of about 23%, and it was confirmed that the strength was safe.

  In addition, although the concrete calculation is not performed about other concrete pillars, since it is higher about C type | mold and D type | mold, it is estimated that there is no problem in intensity | strength. In addition, regarding the A type, it is estimated that there is no problem in strength considering the increase rate of each bending stress and the margin of safety factor of the B type. Therefore, even if the electric pole with the snake climbing prevention function described above is manufactured without changing the material of existing concrete or reinforcing bars, it is possible to ensure a safety factor of not less than a predetermined value (2.0 or more).

  Further, according to the above-described configuration, since the upper surface of the inverted truncated cone part is inclined with respect to the horizontal so that the outside is lowered, rainwater does not accumulate on the upper surface of the inverted truncated cone part, and the drain hole No formation is necessary.

  Furthermore, in the above configuration example, an example in which the conical taper 4 of the inverted truncated cone part 3 is a smooth surface without unevenness has been shown (the distance from the axis of the utility pole 1 increases as it goes upward, and A sufficient effect can be obtained only by providing the conical taper 4 whose vertical line is inclined downward with respect to the horizontal). However, the conical taper 4 may be provided with a serpentine climbing obstructing projection that obstructs the climbing of the snake. The snake has the habit of not being able to engage the abdominal scale (abdominal plate) with a fine spherical projection having a diameter of about 0.5 to 1.0 mm (see (4) in FIG. 4). A large number of hemispherical protrusions having a diameter of 0.05 to 1.0 mm may be provided on the surface at intervals of 1 mm.

  Moreover, in the above-mentioned structure, although the example of the electric pole 1 which consists of a concrete pillar was shown as a columnar standing body, you may employ | adopt the same structure as other columnar standing bodies, such as a metal pillar and a pole. Further, the conical taper 4 of the inverted truncated cone part 3 is preferably a reverse taper having a slight inclination angle so that it does not protrude greatly in the radial direction of the utility pole 2, but the inclination angle may be changed as appropriate. Good.

DESCRIPTION OF SYMBOLS 1 Electric pole 2 Electric pole main body 3 Reverse truncated cone part 4 Conical taper 7 Inclined surface 15 Concrete pump S Axis center GL Ground

Claims (3)

  The inverted frustoconical part with a conical taper that has a conical taper in which the distance from the axial center of the columnar erected body becomes longer as it goes upward and the perpendicular is inclined downward with respect to the horizontal is integrated with the outer peripheral wall of the columnar erected body A columnar standing body with a function of preventing snake climbing, which is provided in the structure.   The columnar upright body with a snake climbing prevention function according to claim 1, wherein the inverted truncated cone part is formed upward from the ground.   The columnar upright body with a snake climbing prevention function according to claim 1 or 2, wherein an upper surface of the inverted truncated cone portion is inclined with respect to the horizontal so as to become lower toward the outside.

Images