WO2022269905A1 - Device for calculating unbalanced load of pole, method, and program - Google Patents

Abstract

The purpose of the present disclosure is to make it possible to calculate the change in an unbalanced load of a pole when installation conditions of a cable are changed.　In a device and a method according to the present disclosure, when installation conditions of a cable are changed, the pole on which said cable is installed is considered to be a target pole, and the tension of each cable installed on the target pole and an unbalanced load of the target pole are computed.

Description

Apparatus, method and program for calculating unbalanced load of pole

The present disclosure relates to a technique for eliminating unbalanced loads generated on poles due to differences in installation conditions of cables such as power lines and telephone lines, which are mainly laid on poles such as utility poles and signal poles that exist outdoors. .

Conventionally, when laying a pole, the tension generated by the cable to be laid on the pole and the resultant force of the load on other attachments are taken into consideration, and this becomes the resultant force (unbalanced load) of the load acting on the pole. The types of poles to be used, etc. are determined after taking into account the influence of uncertain factors such as the strength of the wind pressure and the hardness of the soil on the unbalanced load.

A design load is set for each type of pole as a standard for the allowable load, and the designer when actually constructing the pole should consider the above unbalanced load, the strength of the wind pressure, the hardness of the soil, etc. Select a pole that has a design load that can withstand the load that occurs, taking into account the effects of uncertainties. In addition, depending on the direction of the unbalanced load, in order to prevent the collapse of the utility pole, etc., a branch line, a support, etc. may be installed in a direction that offsets the unbalanced load. In this way, an unbalanced load acting on the pole is assumed according to the magnitude and direction of the tension generated by the cable being laid, and this unbalanced load does not cause deformation of the pole or cracks that lead to destruction. Thus, the type of pole to be used and the like are determined.

Currently, it is assumed that the unbalanced load applied to the pole will not change from the design conditions (size, orientation), except when a new cable is laid. In reality, however, there is a risk that unbalanced load conditions will deteriorate from the design stage due to bias during construction and exposure to the external environment over time, leading to pole deformation and cracks leading to destruction. The occurrence of such unbalanced loads and the associated deformation and cracking of the poles are currently discovered through periodic inspections, but in many cases, there is no choice but to replace the poles with larger design loads. , incurring significant renewal costs.

In addition, if there is excess cable length, there are cases where the slackness of the cable is changed, and if land negotiations are possible, the position of the pole is changed to eliminate the unbalanced load. At the time of construction, we did not calculate how much the unbalanced load would be eliminated by changing the sag or the position of the pole, but decided by judgment at the construction site. At present, when trying to evaluate an unbalanced load, tension T (kN), cable load per unit length w (kN/m), span length S (= distance between cable installation positions) (m), Using the actual length L (m) of the cable and the slackness d (m) of the cable, the tension of the cable is obtained (see Non-Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2020-98126, "Equipment state detection device, device state detection method, and program" (NTT)

Theoretically, it is possible to calculate the amount of change in the span length to adjust the tension arbitrarily, but in reality, as the tension of the corresponding span changes, the unbalanced load changes, resulting in deformation of the pole and change in span length. Therefore, it does not match the tension calculated earlier.

The purpose of the present disclosure is to enable calculation of changes in the unbalanced load of the pole when the cable installation conditions are changed.

Therefore, the present disclosure utilizes the fact that cable tension varies depending on cable laying conditions, and is characterized in that the unbalanced load on the pole before and after changing the cable laying conditions is evaluated from the formulation of the balance of forces acting on the pole. and

Apparatus and methods according to the present disclosure comprise:
Considering the pole on which the cable is laid as the target pole when the cable laying conditions are changed,
Calculate the tension of each cable laid on the target pole and the unbalanced load on the target pole.

The program of the present disclosure is a program for realizing a computer as each functional unit provided in the apparatus according to the present disclosure, and is a program for causing the computer to execute each step included in the method executed by the apparatus according to the present disclosure. .

According to the present disclosure, it is possible to calculate the change in the unbalanced load of the pole when the cable laying conditions are changed, and to obtain the cable laying conditions that eliminate the unbalanced load.

FIG. 4 is a flow diagram of unbalanced load resolution performed by the apparatus of the present disclosure; FIG. 4 is an explanatory diagram of necessary information when calculating tension of a cable; FIG. 4 is an illustration of mechanical elements acting on the pole; FIG. 10 is an explanatory diagram of an example representing deformation of a pole; FIG. 11 is a flow diagram of an example of convergence calculation of a force balance formula; FIG. 5 is an explanatory diagram of feedback to the tension T of the cable by changing the deformation Δ of the pole; It is explanatory drawing of the elimination image of the unbalanced load by change of actual length. There is an example of the relationship between the cable tension T and the actual length L. FIG. 4 is an explanatory diagram of an image of elimination of unbalanced load by changing the span length; It is explanatory drawing of the elimination image of the unbalanced load by changing the degree of sag. It is an explanatory diagram of an example of the influence when changing the cable laying conditions (actual length, span length, slackness, etc.) of the facility system, (a) shows before changing the cable laying conditions, and (b) shows the change of the cable laying conditions. indicate after. FIG. 4 is an explanatory diagram of an example of an unbalanced load that occurs on a pole; It is an example of the connection form of a pole and a cable, (a) shows a restraint, (b) shows pull-through. 2 is a functional block diagram of Embodiment 1. FIG. FIG. 10 is a functional block diagram of Embodiment 2;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below. These implementation examples are merely illustrative, and the present disclosure can be implemented in various modified and improved forms based on the knowledge of those skilled in the art. In addition, in this specification and the drawings, constituent elements having the same reference numerals are the same as each other.

(Embodiment example 1)
FIG. 14 shows a functional block diagram for executing this embodiment. The apparatus according to this embodiment includes an unbalanced load calculator 12 and a cable laying condition calculator 13 . The method performed by the device according to this embodiment is shown in FIG. In the apparatus according to this embodiment, the unbalanced load calculator 12 calculates the unbalanced load acting on the pole (S11), and the cable laying condition calculator 13 calculates the cable laying conditions (actual length , span length, slackness, etc.) are determined (S12), and an implementation method for realizing the above cable laying conditions (actual length, span length, slackness, etc.) is determined (S13). The device of the present disclosure can also be implemented by a computer and a program, and the program can be recorded on a recording medium or provided through a network. A detailed description will be given below.

First, step S11 will be described. In order to calculate the unbalanced load acting on the pole 91, it is necessary to calculate the tension due to the cable 92 laid on the pole 91. FIG. FIG. 2 illustrates the conditions necessary to calculate the tension of a cable 92 laid between two poles 91. FIG. Here, T is the tension (kN), w is the load of the cable 92 per unit length (kN/m), S is the span length (that is, the distance between the installation positions of the poles 91) (m), L is the cable 92 , and d represents the slackness (m) of the cable 92 . At this time, the tension T generated in the cable 92 is expressed by Equation (1) or Equation (2).

Here, w is a numerical value defined for each installed cable 92 . S, L, and d represent the laying conditions of the cable 92. As an example of a method for measuring S, L, and d, the surface of the cable 92 is obtained as three-dimensional point cloud data expressed by three-dimensional coordinate points. There is a method for obtaining (see Patent Document 1).

Next, step S12 will be described. Specifically, a method for determining cable laying conditions (actual length, span length, slackness, etc.) for resolving the unbalanced load based on the calculated unbalanced load is described. FIG. 3 expresses the dynamic elements acting on the pole 91, and the deformation of the pole 91 due to tensions T ₁ , T ₂ . . . A reaction force F due to is considered, and between these forces, the force balance of the following equation (3) can be considered.
(Number 3)
(ΣT _n )+F=0 (3)

Equation (3) can be considered at each pole 91 . Also, the reaction force F due to the deformation of the pole 91 due to the unbalanced load can be considered as shown in Equation (4).
(Number 4)
F=f(Δ) (4)
Here, .DELTA. represents the deformation of the pole 91, which can be represented by, for example, head displacement 83 of the pole 91 (FIG. 4). The head displacement 83 can be obtained, for example, from the horizontal distance between the vertical axis 81 of the pole 91 and the cable laying position 82 .

At this time, each element of equation (3) when the cable laying conditions (actual length, span length, slackness, etc.) are changed should be calculated from equations (1), (2) and (4). think.
FIG. 5 shows the determination flow of the cable tension T and the unbalanced load after changing the laying conditions (actual length L, span length S, slackness d, etc.). The tension of the cable when the cable laying conditions (actual length, span length, slackness, etc.) are changed is calculated by using the actual length L, span length S, and slackness d after the change, using formula (1) or formula (2) ) (step b in FIG. 5).
On the other hand, since the tension of the cable 92 changes, the unbalanced load changes, so the reaction force F of the pole 91 also changes (F') and can be calculated from the equation (3) (step c in FIG. 5).

At this time, the "pole deformation Δ" changes as the reaction force of the pole changes to F' (Fig. 5 step d). Consider the effect on the tension T of the cable 92 due to the change in the deformation Δ of the pole. For example, considering the horizontal distance (=head displacement 83) between the “vertical axis 81 from the ground of the pole” and the “cable laying position 82” as “pole deformation Δ”, “head displacement 83 = span length (FIG. 6), and based on the changed span length, the tension T of the cable 92 is recalculated by equation (1) or (2) (step e in FIG. 5).

At this time, the tension of the cable 92 and the reaction force of the pole 91 obtained from steps c and e of FIG. 5 are used to determine the convergence of the balance equation by equation (5) (step f of FIG. 5).
(Number 5)
(ΣT _n ) + F≦A (5)

Here, A is a threshold for judging convergence and is set to a sufficiently small value. Calculations are repeated until formula (5) is satisfied (FIG. 5-c→d→e→f→c . . . ).

The cable tensions T ₁ ', T ₂ ' . can be used to calculate the unbalanced load after changing the cable laying conditions (actual length, span length, slackness, etc.) as shown in Equation (6).
(Number 6)
Unbalanced load = (ΣT _n ') (6)

Here, considering the convergence calculation in FIG. can be considered (equation (7)).
(Number 7)
(unbalanced load of pole) = g (changed cable laying conditions) ≤ B (7)

Here, B is a threshold value that is sufficiently small. Cable laying conditions (actual length, span length, slackness, etc.) to eliminate the unbalanced load are found by finding the cable laying conditions (actual length, span length, slackness, etc.) that satisfy equation (7). can be calculated.

Including the above series of processes, it can be considered as a function h that calculates "cable installation conditions (actual length, span length, slackness, etc.) after the unbalanced load is eliminated" from the "unbalanced load on the pole". (Formula (8)).
(Number 8)
(Cable laying conditions after unbalanced load is eliminated) = h (unbalanced load on pole) (8)

Depending on the calculation conditions, there are multiple cable laying conditions (actual length, span length, slackness, etc.) that satisfy formula (8), so the optimum cable laying conditions and how to actually implement them will be described.

First, the actual construction method for changing the actual length, span length, and slackness, which are the parameters of the cable laying conditions, will be considered in steps S31 to S33.

Step S31: Consider elimination of the unbalanced load by changing the actual length "changing the actual length of the high tension span". Since the actual length and tension of the cable 92 are inversely proportional (equation (2) and FIG. 8), "extending the actual length of the high tension span" allows for the elimination of unbalanced loads. Therefore, the unbalanced load can be eliminated by increasing the actual length up to the result calculated by Equation (8).

Specifically, as shown in FIG. 7, a member 71 is cut into the connecting portion between the pole 91 and the cable 92 to increase the actual length L of the cable 92 . By preparing members 71 having a plurality of lengths and selecting an appropriate member 71, it is possible to increase the actual length L as desired. In addition, in this construction method, there is no hindrance due to other attachments 73 such as hardware at the connection portion (= bridging position) between the pole 91 and the cable 92, and the connection form of the pole 91 and the cable 92 is "fixed" (Fig. 13(a)). )) and can be implemented when the cable 92 has an excess length. When the connection form of the pole 91 and the cable 92 is "staying", the support 72 of the cable 92 is separated on the left and right sides of the pole 91 and connected to the pole 91 via another attachment 73 .

Step S32: Change of span length Let us consider how to change the position of the pole 91 to eliminate the unbalanced load. By moving the pole 91 to a position that satisfies the cable laying conditions (actual length, span length, slackness, etc.) calculated by Equation (8), the unbalanced load can be eliminated (FIG. 9). In addition, this construction method can be implemented if conditions such as extra cable length, land negotiation with the land owner, and the ground of the new location are satisfied.

Step S33: Change of sag It is considered to cancel the unbalanced load by changing the sag. If there is an excess length of the cable 92 at the cable fixing point of the pole 91, the extra length of the cable 92 is calculated according to the cable installation conditions (actual length, span length, slackness, etc.) calculated by Equation (8). By changing the degree of sag, the elimination of unbalanced loads can be achieved (Fig. 10). In addition, in this construction method, there is no hindrance due to attachments 72 such as other hardware at the connection portion (= bridging position) between the pole 91 and the cable 92, and the connection form of the pole 91 and the cable 92 is "pull-through" (Fig. 13 ( b)), which can be implemented when the cable 92 has an excess length. When the connection form of the pole 91 and the cable 92 is "pull-through", the support 72 of the cable 92 is not separated on the left and right sides of the pole 91, and is fixed to the pole 91 via other attachments 73. .

In this way, whether the cable installation conditions (actual length, span length, slackness, etc.) can be realized
(i) the state of the intervening position;
(ii) the form of connection between the pole 91 and the cable 92 (pull-through, hold-down);
(iii) Negotiated status of surrounding sites;
Varies depending on various conditions such as.

These are collectively referred to as "construction method implementation conditions", and from "unbalanced load on poles" and "construction method implementation conditions" to "optimal cable laying conditions (actual length, span length, slackness, etc.) to eliminate unbalanced loads. ) and the implementation method can be defined as a function k (equation 9).
(Number 9)
(Optimal cable laying conditions and implementation method for resolving unbalanced loads)
= k (unbalanced load of pole, implementation conditions of construction method)) (9)

As described above, the apparatus and method according to this embodiment are
Step S1 of calculating the tension T of the cable using the equation (1) or (2) based on the laying conditions of the cable 92;
a step S2 of calculating the reaction force F and the amount of deformation Δ of the pole 91 based on the determined tension T of the cable 92 using equations (3) and (4);
a step S3 of recalculating the tension T of the cable 92 based on the obtained deformation amount Δ of the pole 91;
Step S4 for determining the convergence of the balance equation (5) based on the reaction force F of the pole 91 obtained in step S2 and the tension T of the cable 92 obtained in step S3;
Step S5 of calculating the unbalanced load of the pole based on the obtained tension of the cable, and repeating steps S2 to S4 when it is determined that the convergence has not been achieved in step S4; ,
have As a result, the present disclosure can calculate changes in the unbalanced load of the pole 91 when the cable 92 laying conditions are changed, and can obtain the cable 92 laying conditions that eliminate the unbalanced load. Become.

(Embodiment example 2)
FIG. 15 shows a functional block diagram for executing this embodiment. When the cable laying conditions (actual length, span length, slackness, etc.) are changed in order to eliminate the unbalanced load, the tension of the cable laid on the adjacent pole also changes. The flow of step S12 in example 1 can be replaced as follows.

A plurality of poles and cables installed on those poles are collectively called "equipment system", and an example is shown in FIG. Consider changing the laying conditions of the cable 92-3 between the poles 91-3 and 91-4 in order to eliminate the unbalanced load on the pole 91-3. By changing the laying conditions of the cable 92-3 between the poles 91-3 and 91-4, the loads T1' and T2' of the cable laid on the pole 91-3 can be considered as shown in equation (10). can.
(Number 10)
(Cable tension on pole 91-3: T1', T2')
= g (changed cable laying conditions between poles 91-3 and 91-4) (10)

In this way, starting from the pole 91-3 where the unbalanced load is to be eliminated, the tension of the cable 92 laid on each pole 91 is changed in order by changing the cable laying conditions (actual length, span length, slackness, etc.). can be calculated to As a series of these, it is possible to consider a function j for calculating the unbalanced load of each pole of the equipment system when the installation conditions (actual length, span length, slackness, etc.) of a certain cable 92 are changed (equation (11))
(Number 11)
(unbalanced load of pole X) = j (changed cable laying conditions) (11)

As in Embodiment 1, by considering the function h for calculating the "cable installation conditions (actual length, span length, slackness, etc.) after the unbalanced load is eliminated" from the "unbalanced load on the pole", the facility system , the cable installation conditions (actual length, span length, slackness, etc.) for canceling the unbalanced load of a certain pole X can be obtained (equation 12).
(Number 12)
(Cable laying conditions after unbalanced load is eliminated)
=h (unbalanced load on pole X) (12)

(Effect of the present disclosure)
According to the present disclosure, when the installation conditions (actual length, span length, slackness, etc.) of the cable 92 connected to the pole 91 with an unbalanced load are changed, the unbalance generated in the pole 91 It is possible to calculate how the equilibrium load changes.

Specifically, as a dynamic element acting on each pole 91, the force balance between the tension of the cable 92 connected to the pole 91 and the reaction force due to the deformation of the pole 91 due to the unbalanced load is considered. be able to. In addition, the relationship between "cable tension" and cable laying conditions (actual length, span length, slackness, etc.), "reaction force due to pole deformation due to unbalanced load" and displacement of pole cable laying position By defining the relationship of (head displacement), it is possible to calculate the unbalanced load of the pole 91 before and after changing the cable laying conditions more accurately than before.

From the above, it is possible to calculate under what cable 92 installation conditions the unbalanced load can be eliminated when an unbalanced load is generated on the pole 91 . In addition, it can be used for examination of members and efficient construction methods for realizing the laying conditions of the cable 92, and can contribute to efficiency and cost reduction of current unbalanced load elimination construction methods. In addition, from the viewpoint of early elimination of unbalanced loads, it can contribute to the suppression of cracks and pole breakage in the future, that is, the realization of long-term safe use of equipment.

This disclosure can be applied to the information and communications industry.

71: Member 72: Support 73: Attachment 91: Pole 92: Cable

Claims (6)

1. Considering the pole on which the cable is laid as the target pole when the cable laying conditions are changed,
   Calculate the tension of each cable laid on the subject pole and the unbalanced load of the subject pole,
   Device.
2. When an unbalanced load is generated on the target pole, calculate how to change the cable laying conditions in order to eliminate the unbalanced load.
   A device according to claim 1 .
3. When there are multiple cable laying conditions to eliminate the unbalanced load, select the optimum execution condition,
   3. Apparatus according to claim 2.
4. Considering the pole on which the cable is laid as the target pole when the cable laying conditions are changed,
   Calculate the tension of each cable laid on the subject pole and the unbalanced load of the subject pole,
   Method.
5. When an unbalanced load is generated on the target pole, calculate how to change the cable laying conditions in order to eliminate the unbalanced load.
   5. The method of claim 4.
6. A program for realizing a computer as each functional unit provided in the device according to any one of claims 1 to 3.

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