JPH1046872A - Support method of utility pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the root-opening width of a supporting wire fitted to a utility pole. SOLUTION: The support method of the utility pole is constituted so that a supporting wire capable of resisting unequal tension working to the utility pole is stretched between the utility pole and a ground surface at a specified setting angle. An arm 11 projected from the utility pole 1 approximately horizontally is installed at the place of the intermediate section of the utility pole 1 on the reverse side in the direction of application of unequal tension P at that time, the first supporting wire 12 is mounted on the utility pole through the arm 11 while an arm 21 protruded from the utility pole 1 approximately horizontally at the place of the upper section of the utility pole 1 on the reverse side in the direction of application of unequal tension P, and the second supporting wire 22 is set up to the utility pole 1 through the arm 21. Root- opening can be inhibited within 1.3m though it has been 3m or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supporting a utility pole, and more particularly, to a branch wire mounting structure for narrowing the width of a branch wire attached to a utility pole.

[0002]

2. Description of the Related Art An electric pole, which is a support for an overhead electric wire path, is installed with its lower end buried in a predetermined length in the ground and can stand on its own. Alternatively, when there is a difference in the number of overhead wire strips on both sides, biased tension (non-average tension) acts on the electric pole, and a branch line is attached to cancel the tension and prevent a tilt or a collapse accident of the electric pole. Such a branch line generally has a structure in which a wire 2 of a predetermined specification is stretched obliquely downward from the upper part of the telephone pole 1 and an end of the branch line is fixed to the ground by an anchor 3 buried underground, as shown in FIG.

[0003]

By the way [0008], in the conventional branch structure, branch line of the overhanging W ₀ (the so-called root opening) from the utility pole there was a disadvantage that becomes larger. That is, as shown in FIG. 10, when the non-average tension P in the horizontal direction acts on the electric pole 1 by the electric wire 4, if the electric pole 1 is supported by the horizontal tension T ₀ (= P) in the opposite direction, the tension P is increased. It is canceled and the pole 1 can be balanced. The support tension T ₀ is determined by changing the angle of attachment of the branch line to θ as shown in FIG.
Then, since the horizontal component force of the branch line tension t is obtained, the following expression is obtained. T ₀ = t · sin θ (Equation 1) Therefore, as is clear from the equation, the smaller the θ, the smaller the support tension T _0.
Can not be set to 0 to support the angle, and a certain degree of attachment angle θ is required.
₀ occurs.

[0004] This rooting causes a troublesome problem, especially in urban urban areas where houses and buildings are densely packed. In some cases, a branch line straddles the sidewalk and reaches the inside of the residential premises, or blocks and blocks an entrance, a garage doorway, or a vehicle entrance where the sidewalk curb is at a low level. For this reason, the consent of the residents located on the pillars cannot be obtained, and there are many cases in which the installation of the track is hindered. It is generally difficult to change the direction of attaching the branch line to another direction that does not interfere. This is because the mounting direction of the branch line is inevitably determined by the arrangement state of the line (the direction in which the wire tension acts).

[0005] Further, in an area where the amount of snowfall is large in the winter period, not only the branch line is an obstacle, but also the weight of the accumulated snow is applied to the branch line, so that the branch line is loosened and its function is impaired. The weight of snow on this branch line increases as the root spread increases.For example, in heavy snow areas where the amount of snow covers several meters, such as Hokkaido and the Tohoku Sea of Japan, Joshinetsu, and the Hokuriku region, the weight of snow is Anchors have risen, branch lines have been loosened, and their functions have been lost at all.

On the other hand, even if the branch line angle θ is reduced,
If the design tension t of the branch line is increased, a similar support tension T can be obtained in theory, so that it is possible to reduce the root opening. However, in order to increase the design tension t of the branch line, it is necessary to use a wire having a large diameter and high strength, so that the material cost increases, and the anchor (3) for fixing the branch line is also large, so that the embedding work is not easy. Absent. In addition, when the branch line tension t increases, the vertical component acting on the utility pole also increases, so that a new problem arises in that the utility pole sinks due to the vertical component.

On the other hand, in order to solve such a problem,
The inventor of the present invention has previously proposed a new method of attaching a branch line (Japanese Patent Application No. 8-157624). According to this method, a branch line is attached via an arm that extends substantially horizontally from a telephone pole. According to this method, the divergence is significantly narrower than that of a conventional method (for example, the conventional method has been reduced to about 1 m instead of about 3 m). .8m
To the extent), and a practically sufficient effect can be expected. However, if the rooting can be further narrowed while securing the same supporting force and safety, the range of use of the present invention is expanded, and the merit obtained at the construction site of the pole is further increased.

[0008] Therefore, an object of the present invention is to further reduce the root opening width of a branch line attached to a utility pole.

[0009]

In order to achieve the above-mentioned object and to solve the problem, a method of supporting a utility pole according to the present invention comprises the steps of: forming a branch line capable of withstanding non-average tension acting on the utility pole at a predetermined mounting angle; In a method for supporting a utility pole stretched between a utility pole and the ground, an arm (lower arm) projecting substantially horizontally from the utility pole is provided at a position opposite to the direction of action of the non-average tension and at an intermediate portion of the utility pole. While the first branch line is attached to the utility pole via the arm, an arm (upper arm) projecting substantially horizontally from the utility pole is provided on the opposite side of the direction of the non-average tension and at the upper position of the utility pole. Attach the second branch line to the utility pole.

[0010]

According to the supporting method of the present invention, a first branch line (lower branch line) is attached via an arm at a position opposite to the non-average tension acting on the utility pole and at an intermediate position of the utility pole, and at a side opposite to the non-average tension. The electric pole is supported by attaching a second branch line (upper branch line) to the upper position of the telephone pole via an arm. Conventionally, in order to obtain a horizontal component force that can counteract the non-average tension, a branch line was simply attached at a certain angle to the upper part of the utility pole, but in this support method, it is extended substantially horizontally from the utility pole Branch line via arm (upper branch line)
Because of the mounting, the vertical component in addition to the horizontal component can be used as the supporting force.

Further, according to the present invention, it is possible to further effectively support the power line by using the upper branch line. This is because another branch line (lower branch line) is provided at the middle part of the telephone pole via an arm that extends substantially horizontally from the telephone pole, and this lower branch line has an unbalanced tension at the middle part of the telephone pole (lower branch line mounting position). , And apparently move the lower end (ground) of the utility pole upward, as will be described later based on mathematical formulas and specific numerical values.
This is because it has a function that can be equivalent to burying a telephone pole in the ground up to a position above the actual ground.

Therefore, according to the present supporting method, a large supporting force can be obtained even though the branch line tension is smaller than before, and the mounting angle is reduced even with the same branch line tension (designed tension of the branch line), and the root of the branch line is reduced. The opening can be kept narrow. Further, even if the root opening is reduced, the same or larger supporting force can be obtained as before, so that it is not necessary to make the branch wire large in diameter and high in strength or to make the anchor large. It should be noted that, in a construction site where there is a sufficient space and there is no need to particularly narrow the root opening of the branch line, it is of course possible to secure the same root opening as in the related art. The present invention can obtain the same supporting force as the conventional one with a small root opening, but if the root opening is the same as the conventional one, it is possible to further reduce the design tension of the branch line. The utility pole can be supported by a small anchor, which can reduce material costs and simplify construction.

[0013] Further, if the angle of attachment of the branch line is reduced, for example, if the branch line is stretched substantially vertically, even in an area with a large amount of snow, the weight of the snow on the branch line will hardly be applied.
Damage such as lifting of the anchor or loosening of the branch line due to snow load on the branch line can be prevented. The "intermediate position of the telephone pole" where the first branch line is mounted means between the second branch line mounting position on the upper part of the telephone pole and the lower end of the telephone pole (at the ground), and is just half of the telephone pole. It does not mean only the height position of 1.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an example of a utility pole supporting method according to the present invention. As shown in the figure, in this supporting method, arms 11 (lower arm) and 21 (upper arm) are arranged at the middle part of the utility pole opposite to the non-average tension P and the upper part of the utility pole, respectively. The branch lines 12 and 22 are attached. In order to prevent breakage of the arms 11 and 21, diagonal members 13 and 23 for reinforcement are provided at an appropriate installation angle from the end of each arm.

As described above, the present inventor has previously proposed a method of supporting a utility pole using an arm (Japanese Patent Application No. 8-157624). In this method, as shown in FIG. 8, a branch line 32 is attached via an arm 31 projecting substantially horizontally from the utility pole 1. The branch line tension is t, the attachment angle of the branch line is θ, the arm length is l, and Height above ground (Electric wire 3 from ground G)
3 and the height of the branch line 32 to the mounting position), the following equation is established from the balance of the moment around the ground point E. P · H = t · sin θ · H + t · cos θ · l (Equation 2) Accordingly, the supporting tension T obtained by the branch line 32 (see FIG. 10)
T ₀ ) is given by: T = t · sin θ + t · cos θ · l / H (Equation 3) As is apparent from the equation, the branch line which did not contribute to supporting the non-average tension P by the conventional method. It is possible to use the vertical component (t · cosθ) of
Even if the extension l of the arm from the telephone pole is included, the root width W of the branch line can be reduced.

On the other hand, the present inventor has further researched and noticed that if the ground height H of the utility pole can be reduced, the support tension T expressed by the above equation 3 can be further increased (the arm length l should be increased). (Of course, the supporting force increases), and it was examined whether such a supporting structure can be obtained. As a result, the present invention in which the intermediate part of the telephone pole is supported by another branch line has been completed.

That is, as shown in FIG. 1, the wire tension (average tension) is P, the ground height of the pole is H, and the lower branch line 12 is
M ₁ a support moment due, h ₁ the mounting height of the lower arm 11, the height h ₂ from the arm to the upper arm 21, the length of the arm 11 and 21 l, the mounting angle of the upper branch 22 theta _2. Assuming that the tension of the upper branch line 22 is t ₂ , the following equation is established from the balance of the moment around the ground E point of the electric pole 1. P · H = t ₂ · sin θ ₂ · H + t ₂ · cos θ ₂ · l + M ₁ (Equation 4) Since H = h ₁ + h ₂ , the same equation is obtained by P · (h ₁ + h ₂ ) = t ₂ · sin θ ₂ · H + t ₂ · cos θ ₂ · l + M ₁ (Equation 5) and can be transformed as shown in the following equation. P · h ₂ = t ₂ · sin θ ₂ · H + t ₂ · cos θ ₂ · l + M ₁ -P · h ₁ (Equation 6)

Therefore, as is apparent from the equation, M ₁ = P
Do it a · h ₁ and comprising support moment M ₁ in addition to utility poles, in order to support the non-round tension P, and apparently utility pole C
The same effect can be obtained as if the point were buried in the ground. Because M ₁ = P · h ₁ , Equation 6 is given by: P · h ₂ = t ₂ · sin θ ₂ · H + t ₂ · cos θ ₂ · l (Equation 7), and the non-average tension P (left side) for, because the height of the utility pole is h _2. Further, the obtained supporting tension T ₂
Is as follows from Equation 7, and H / h ₂ > 1 and h ₂ <H, so that a larger supporting force than the supporting tension T of Equation 3 can be obtained. T ₂ = t ₂ · sin θ ₂ · H / h ₂ + t ₂ · cos θ ₂ · l / h ₂ (Equation 8) As described above, according to the present invention, the support for attaching the branch line (upper branch line 22) only to the upper part of the telephone pole is provided. Unlike the structure, the buried position (ground) of the utility pole can be apparently raised and a large supporting force can be obtained, so that the width (W ₂ ) of the branch line can be further narrowed.

The magnitude of the supporting moment M ₁ by the lower branch line does not necessarily have to be set strictly so that M ₁ = P · h ₁ , but can be made larger or smaller as appropriate. No problem. As described above, M ₁ = P ·
if h _1, the apparent utility pole height becomes h _2, just but the same effect as buried utility pole to the lower branch mounting position C is obtained, for example, as shown in FIG. 1, H = h ₁₁ + h
₁₂ and h ₁₁ <h _1, h _12> the h ₂ distance h ₁₁ and h
Considering ₁₂ , even if M ₁ is smaller than P · h ₁ (M ₁ =
And P · h _11), the equation 4, since _{P · (h 11 + h 12} ) = t 2 · sinθ 2 · H + t 2 · cosθ 2 · l + M 1 ... ( can be put to Equation 9), P · h ₁₂ = t ₂ · sin θ ₂ · H + t ₂ · cos θ ₂ · l + M ₁ -P · h ₁₁ = t ₂ · sin θ ₂ · H + t ₂ · cos θ ₂ · l (Equation 10) the h _12, and the still, h ₁₁
This is because a support effect equivalent to burying a telephone pole in the ground can be obtained. That is, the lower branch line in the present invention is not intended to support the non-average tension P, but is installed to raise the ground apparently and lock the telephone pole at the position. Therefore, according to the present invention, even if the number of branch lines attached to the power pole is increased and the root gap is reduced, the vertical load acting on the power pole does not increase as compared with the conventional method, and the problem that the power pole sinks occurs. Never.

In the following, the extent to which the root gap can be reduced by the present method as compared with the conventional method will be concretely examined by taking a branch line as an example. As a conventional method, construction is performed based on the standards and design specifications of Nippon Telegraph and Telephone Corporation (NTT), and this method is compared with the present method. (A) In the case of the conventional method In the conventional method (FIG. 9), the ground height H of the telephone pole is 6.5 m,
The wire tension P (= T ₀ ) to be supported is 1670 kg (NT
(Corresponding to T standard 30CR wire, the same applies hereinafter), and branch line tension t is 3
In the case of 866 kg (65 CR line), the branch line mounting angle θ is 25 ° or more according to the NTT design specifications. Therefore, the root opening W ₀ is expressed as: W ₀ = 6.5 × tan25 ゜ = 3.03 (Equation 11), and a root opening of at least 3.03 m has conventionally occurred.

(B) In the case of the present method On the other hand, if the same branch line (branch tension: 3866 kg) is used and the present method (FIG. 1) is applied, the following is obtained. First, it is assumed that the lower branch line 12 is installed to apparently rise to the position of the branch line near the telephone pole, and the mounting angle θ ₁ and the mounting height h ₁ of the branch line 12 where M ₁ = P · h ₁ are obtained. Assuming that the branch line tension of the lower branch line is t ₁ , the supporting moment M ₁ by the branch line is M ₁ = t ₁ · sin θ ₁ · h ₁ + t ₁ · cos θ
_Since it is ₁ · l, t ₁ · sin θ ₁ · h ₁ + t ₁ · cos θ ₁ · l = P · h ₁ (Equation 12) When the same equation is solved for h ₁ , the following equation is obtained. h ₁ = t ₁ cos θ ₁ · l / (P−t ₁ sin θ ₁ ) = 3866 × cos θ ₁ × 1.0 / (1670 × 0.9−3866 × sin θ ₁ ) (Expression 13) Multiplied by 0.9 to the average tension P
This is in order to meet the design specifications of NTT in which 90% of the wire tension is supported by the branch wire and the remaining 10% is supported by the utility pole itself. The length l of the arm was 1.0 m.

In equation (13), for example, if θ ₁ = 0 °, that is, if the lower branch line 12 is set vertically, h ₁ =
2.6 m. Since H = h ₁ + h ₂ = 6.5 m, h ₂ = 3.9 m. Further, the mounting angle θ ₂ of the upper branch line is obtained by the above equation 7, and the equation is modified as follows to solve the equation for θ ₂ . P · h ₂ = t ₂ · sin θ ₂ · H + t ₂ · cos θ ₂ · l = t ₂ (H ² + l ² ) ^1/2 sin (θ ₂ + ψ) (Equation 14) where ψ = cos ^-1 ｛H / (H ² + l ² ) ^1/2 ｝ = co
s ^-1 {6.5 / (6.5 ² +1 ² ) ^1/2 } = 8.7 [゜]
It is. When Equation 14 is solved for θ ₂ , the following equation is obtained. θ ₂ = sin ⁻¹ ｛P · h ₂ / t ₂ / (H ² + l ² ) ^1/2 ψ−ψ (Equation 15) By substituting a numerical value into the above equation and obtaining θ ₂ , the following is obtained. Become. ^{_{θ 2 = sin -1 {1670 ×}} 0.9 × 3.9 / 3866 / (6.5 2 +1 2) 1/2} -8.7 = 4.6 [ deg.] (Formula 16)

On the other hand, the root differences W ₁ and W ₂ of each branch line can be obtained by the following equations. W ₁ = 1 + h ₁ · tan θ ₁ (Equation 17) W ₂ = 1 + H · tan θ ₂ (Equation 18) In these equations, l = 1, h ₁ = 2.6, θ ₁ = 0 °, H =
By substituting 6.5 and θ ₂ = 4.6 °, W ₁ = 1 [m],
W ₂ = 1.52 [m].

Similarly, the mounting angle θ ₁ of the lower branch line is set to 3
根, 4 ゜, 5 ゜, the root opening width was calculated. The results are shown in the following table.

[0025]

[Table 1]

As is clear from the table, the mounting angle θ of the lower branch line is shown.
_{When 1 is set} to about 4 to 5 degrees, the root opening W ₁ , W ₂
Can be set within 1.3 [m], and the conventional (3.03)
m) or less.

Further, as in this embodiment, the arms 11 and
When 1 is supported by the diagonal members 13 and 23, unbalanced loads are applied to the diagonal member support positions B and D and the lower arm mounting position C, but the bending moment due to these loads falls within the design strength of the utility pole. Consider whether or not. First, FIG.
(A), the mounting angle of 45 ° of the diagonal members 23, an unbalanced load acting on the arm support position B and P _1, given the present structure as cantilever truss, the moment around the point A From the balance, the following equation is established. P ₁ · l = t ₁ · cos θ ₁ · l (Equation 19) Accordingly, from the equation, the unbalanced load P ₁ acting on the point B is as follows. P ₁ = t ₁ · cos θ ₁ (Equation 20) Similarly, consider the cantilever truss shown in FIG. 3B assuming that loads acting on the arm base end portion C and the arm supporting position D are P ₂ and P ₃ , respectively. , P ₂ and P ₃ are obtained from the balance of moments around points D and C as follows. P ₂ = t ₂ · (cos θ ₂ + sin θ ₂ ) (Equation 21) P ₃ = t ₂ · cos θ ₂ (Equation 22)

The pole is supported at one end and fixed at the other end as shown in FIG.
Considering a fixed beam, bending moment M of fixed end E_ETo
Ask. As shown in FIG. 4 (a), there is no point A support.
Deflection of point A in case y₁Is y₁= P₁(H-1)^Three/ 3EI + P₁(H-1)^Two・ 1 / 2EI + P_Three(H₁−l)^Three/ 3EI + P_Three(H₁−l)^Two・ (H_Two+1) / 2EI (Expression 23). On the other hand, as shown in FIG.
Support reaction force R_ABut the load P at point C_TwoAct on each other
Deflection of point A when^TwoIs y^Two= R_AH^Three/ 3EI + P_Twoh₁ ^Three/ 3EI + P_Twoh₁ ^Twoh_Two/ 2EI (Expression 24) Since point A is a fulcrum and does not actually displace,
y₁= Y_TwoFrom Equations 23 and 24,_ASought
Then, R_A= ｛P₁(H-1)^Two(2H + 1) -P_Twoh₁ ^Two(2h₁+ 3h_Two) + P_Three(H₁-L)^Two(2h₁+ 3h_Two+1)｝ / 2H^Three... (Equation 25) Therefore, the bending moment M of the fixed end E_EIs as follows
You. M_E= P₁(H-1) -P_Twoh₁+ P_Three(H₁−l) -R_AH = P₁(H-1) -P_Twoh₁+ P_Three(H₁−l) − ｛P₁(H-1)^Two(2H + 1) -P_Twoh₁ ^Two(2h₁+ 3h_Two) + P_Three(H₁−l)^Two(2h₁+ 3h_Two+1)｝ / 2H ^Two … (Equation 26)

For example, the height H of the pole above the ground is 6.5 m, the length l of the arm is 1.0 m, and the tensile strengths t ₁ and t ₂ of the branch wires are 38.
66kg (65CR branch line), design load of telephone pole is 400k
and g, considered lower branch of the mounting angle theta ₁ to 5 °, when the upper branch of the mounting angle theta ₂ 2.2 ° (fourth calculation example shown in the table). Design moment M _r of utility poles is _{M r = 400 × 6.5 = 2600} [kgm] ... ( Equation 21).

On the other hand, each load P at points B, C and D₁,
P_Two, P_ThreeIs P₁= T₁・ Cos θ₁= 3866 × cos5 ゜ = 3851 [kg] (Equation 21) P_Two= T_Two・ (Cos θ_Two+ Sin θ_Two) = 3866 × (cos 2.2 ゜ + sin 2.2 ゜) = 4012 [kg] (Equation 22) P_Three= T_Two・ Cos θ_Two= 3866 × cos2.2 ゜ = 3863 [kg] (Equation 23), the moment M of the pole end E of the utility pole is obtained._EEquation 26
Is as follows. M_E= P₁(H-1) -P_Twoh₁+ P_Three(H₁−l) − ｛P₁(H-1)^Two(2H + 1) -P_Twoh₁ ^Two(2h₁+ 3h_Two) + P_Three(H₁−l)^Two(2h₁+ 3h_Two+1)｝ / 2H ^Two = 3851 × (6.5-1) -4012 × 3.3 + 3863 × (3.3-1)-｛3851 × (6.5-1)^Two× (2 × 6.5 + 1) −4012 × 3.3^Two × (2 × 3.3 + 3 × 3.2) + 3863 × (3.3-1)^Two× (2 × 3.3 + 3 × 3.2 + 1)｝ / (2 × 6.5^Two) = 1742 [kgm] (Expression 24)_E<< M_rAnd there is no practical problem
You.

The present invention is not limited to the above embodiment. For example, specific numerical values such as the length of the arm and the mounting angle of each branch line are shown as examples, and can be changed as appropriate. The number of branch lines is not necessarily limited to two, and three or more branch lines can be provided. When the arm is supported by a diagonal member as in the embodiment, depending on the diameter and the material (design strength) of the telephone pole, the diagonal member support position (B, D) is shifted upward or downward to obtain the bending moment M. It is also possible to adjust _E. The method of fixing the arm to the utility pole is not particularly limited. For example, the arm may be fixed to the surface of the utility pole via a belt (ring) wound around the utility pole, or a hole may be formed in the periphery of the utility pole, and the arm may be inserted into the hole and fixed. It does not matter. The arms 11 and 21 do not necessarily have to have the same length.

Further, in the above-described embodiment, the description has been made by taking the stranded branch line as an example. However, the same advantageous effects can be obtained even when the present invention is applied to a case where there is a difference in the line curve (single branch line) or the number of the overhead lines as shown in FIG. Can be obtained. Further, when there is a possibility that the lower diagonal member 13 may obstruct traffic, for example, the diagonal member can be installed above as shown in FIG. Further, as shown in FIG. 7, the first branch line 12 is connected to the arm (11).
It is also possible to attach to a utility pole without going through.
This is because, although the supporting moment M ₁ is reduced, the above-described effect of raising the apparent height above the ground can be obtained.

[0033]

As described above, according to the method for supporting a utility pole according to the present invention, it is possible to further reduce the opening width of a branch line attached to the utility pole.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a utility pole supporting method according to the present invention.

FIG. 2 is a diagram in which a support part by an arm is replaced by a cantilever truss.

FIG. 3 is a diagram showing a load acting on a utility pole using the present supporting method.

FIG. 4 is a diagram for determining a moment acting on a base end of a utility pole.

FIG. 5 is a perspective view showing an example of attaching a branch line at a track curve point.

FIG. 6 is a view showing a modification of the utility pole supporting method according to the present invention.

FIG. 7 is a view showing another modification of the utility pole supporting method according to the present invention.

FIG. 8 is a diagram showing an example of a utility pole supporting method proposed by the present inventors previously.

FIG. 9 is a diagram showing an example of a conventional utility pole supporting method.

FIG. 10 is a diagram showing the principle of supporting a utility pole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Utility pole 4 Electric wire 11, 21 Arm 12 First branch line (lower branch line) 22 Second branch line (upper branch line) 13, 23 Diagonal material

Claims (1)

[Claims] 1. A method of supporting a utility pole in which a branch line capable of countering the non-average tension acting on the utility pole is stretched between the utility pole and the ground at a predetermined mounting angle, wherein a side opposite to a direction in which the non-average tension acts. And, at an intermediate position of the utility pole, an arm extending substantially horizontally from the utility pole is provided, and the first branch line is attached to the utility pole via the arm, and at the opposite side to the direction of action of the non-average tension and at the upper position of the utility pole, A method of supporting a utility pole, comprising: providing an arm extending substantially horizontally from a utility pole, and attaching a second branch line to the utility pole via the arm.