Stringing member

Abstract

The purpose of the present invention is to provide a stringing member and a stringing method with which an unbalanced load can be visually detected.　A stringing method according to the present invention installs, at the top of a pole 10 erected on the ground G and in the direction in which the height of the pole 10 is increased, a stringing member 30 that is formed of a material which more easily deforms than the pole 10. A stringing member according to the present invention is made of a material that is more flexible than an electric pole, and deforms when a prescribed unbalanced load or greater is applied, so that such a state can be visually determined. Further, deformation of the stringing member 30 moves the stringing position. As a result, the tension of a cable changes and the unbalanced load Pu decreases, so that force applied to the pole 10 can be reduced.

Description

Scaffolding members

[0001] The present disclosure relates to a crossing member that is attached to the top of a pole, such as a utility pole, that is erected on the ground.

[0002] FIG. 1 is a diagram illustrating the effect of an unbalanced load on a pole 10. When an unbalanced load P ｕ (= cable tension (P １ -P ２ ) and the load P of the pole accessory 11 ３ If a resultant force of X is applied to the pole, there is a risk of deterioration X occurring.

[0003] International Publication WO2021 / 033249 Brochure

[0004] Patent Document 1 discloses a technique for creating a three-dimensional model of a cable using a three-dimensional laser measuring device. However, it is difficult to detect unbalanced loads visually, and in many cases, the presence of an unbalanced load becomes apparent only when the pole deteriorates. Therefore, in order to solve the above problem, the present invention aims to provide a suspension member and suspension method that can detect unbalanced loads visually.

[0005] In order to achieve the above object, the crossing member of the present invention is made of a material softer than that of a utility pole, and deforms when an unbalanced load of a predetermined magnitude or greater is applied, making it possible to visually determine the condition.

[0006] The crossing member of the present invention is a crossing member that is installed on the top of a pole erected on the ground and increases the height of the pole, and is characterized in that it is made of a material that is more easily deformed than the pole.

[0007] In addition, the bridging method of the present invention installs a bridging member made of a material that is more easily deformed than a pole erected on the ground at the top of the pole and in a direction that increases the height of the pole.

[0008] 2 is a diagram illustrating the crossing member 30 according to the present invention. The symbol G indicates the ground. The crossing member 30 is installed so as to cover the top of the pole 10. The crossing member 30 is cylindrical and made of FRP such as glass or carbon, and is a member that is more easily deformed than the pole 10 (i.e., has a smaller Young's modulus) and less likely to break. The crossing member 30 is also resistant to the unbalanced load P ｕ (represented by the bridge member 30a) is deformed by the unbalanced load P ｕ Therefore, the present invention can provide a bridging member and a bridging method that allow for visual detection of an unbalanced load.

[0009] For example, the suspension member of the present invention has an attachment portion for attaching at least one of a cable and an accessory as a suspension part at a position higher than the top of the pole, and is characterized in that it undergoes a predetermined deformation amount when the unbalanced load generated in the suspension part attached to the attachment portion is the upper limit value of the unbalanced load set for the pole.

[0010] Furthermore, the suspension method according to the present invention is characterized in that at least one of a cable and an accessory is attached as a suspension part to an attachment part of the suspension member that is located at a position higher than the top part of the pole, and when the unbalanced load generated in the suspension part attached to the attachment part is the upper limit value of the unbalanced load set for the pole, the deformation of the suspension member reaches a predetermined amount.

[0011] Here, the suspension member of the present invention has an attachment portion for attaching at least one of a cable and an accessory as a suspension part at a position higher than the top of the pole, and is characterized in that it deforms due to an unbalanced load generated in the suspension part attached to the attachment portion, thereby alleviating the unbalanced load applied to the pole.

[0012] Furthermore, the suspension method according to the present invention is characterized in that at least one of a cable and an accessory is attached as a suspension part to an attachment part of the suspension member that is located at a position higher than the top of the pole, and the suspension member is deformed by an unbalanced load generated in the suspension part attached to the attachment part, thereby alleviating the unbalanced load applied to the pole.

[0013] The deformation of the bridge member 30 causes the bridge position to move, and as a result, the cable tension changes and the unbalanced load P ｕ becomes smaller, and the force applied to the pole 10 also becomes smaller.

[0014] Furthermore, the suspension method of the present invention is characterized by: attaching a cable to an attachment portion of the suspension member that is located at a position higher than the top of the pole; when the suspension member is deformed due to an unbalanced load generated by the cable attached to the attachment portion, detaching and releasing the cable from the attachment portion; and reattaching the cable that has been once released to the attachment portion of the suspension member.

[0015] The unbalanced load P ｕ If it is determined that the unbalanced load P is occurring, the cable 50 is detached from the bridging member 30 and released, and the bridging position of the cable 50 is changed and the cable is attached to the attachment part of the bridging member 30 again. ｕ can be reduced.

[0016] The above inventions can be combined as much as possible.

[0017] The present invention can provide a bridging member and a bridging method that allow unbalanced loads to be detected visually.

[0018] FIG. 1 is a diagram explaining the effect of an unbalanced load on a pole 10. FIG. 2 is a diagram explaining the effect of a bridging member according to the present invention. FIG. 3 is a diagram explaining a bridging member according to the present invention. FIG. 4 is a diagram explaining a method for alleviating an unbalanced load with a bridging member according to the present invention. FIG. 5 is a diagram explaining a method for alleviating an unbalanced load with a bridging member according to the present invention. FIG. 6 is a diagram explaining a bridging method according to the present invention. FIG. 7 is a diagram explaining a bridging method according to the present invention.

[0019] The following description of the preferred embodiments of the present invention will be given with reference to the accompanying drawings. The preferred embodiments described below are examples of the present invention, and the present invention is not limited to the preferred embodiments. In this specification and the drawings, components having the same reference numerals are intended to represent the same components.

[0020] (Embodiment 1) FIG. 3 shows the unbalanced load P ｕ 3A and 3B are diagrams illustrating a method for detecting the height of a pole 10. FIG. 3A illustrates a pole 10 erected on the ground G. FIG. 3B illustrates a process for installing a bridging member 30, which is made of a material that deforms more easily than the pole 10 erected on the ground G, on the top of the pole 10 in a direction that increases the height of the pole 10. For example, the pole 10 has a truncated cone shape, and the end with the larger base area is buried in the ground. The end with the smaller base area is the top of the pole 10. The bridging member 30 has a hollow truncated cone shape. The diameter of one bottom surface of the bridging member 30 is larger than the diameter of the top of the pole 10, and the diameter Φ of the other bottom surface of the bridging member 30 is approximately equal to the diameter of the top of the pole 10. In such a case, the bridging member 30 is installed so that one bottom surface covers the top of the pole 10. The bridging member 30 has an attachment portion (not shown) for attaching at least one of a cable 50 and an accessory 51 as a bridging component at a position higher than the top of the pole 10. In this embodiment, the bridging component will be described as the cable 50.

[0021] Figure 3(C) shows the unbalanced load P ｕ In this embodiment, the cable tension P １ and cable tension P２ The vector sum of (P ｕ =P １ -P ２ The crossing members 30 are made of a material that is more easily deformed than the poles 10. For example, the poles 10 are made of concrete, and the crossing members 30 are made of FRP such as glass or carbon. Therefore, the unbalanced load P ｕ The crossing member 30 is deformed by Δ. For example, Δ is the distance from the center of the other bottom surface of the crossing member 30 to the center of the other bottom surface of the deformed crossing member 30a, and is a component parallel to the ground G. On the other hand, the pole 10 is assumed not to deform.

[0022] For example, the bridge member 30 is designed to withstand the unbalanced load P generated by the bridge components attached to the attachment portion. ｕ is the upper limit of the unbalanced load set on the pole 10 (the unbalanced load that will cause deterioration of the pole), a predetermined amount of deformation will occur. Specifically, the material of the crossing member 30 is adjusted so that Φ = Δ when the upper limit of the unbalanced load set on the pole 10 is applied. For example, if the material is FRP, the "ease of deformation" can be adjusted by changing the type of fiber or the angle at which the fiber is wound. By designing the crossing member 30 in this way, it becomes possible to easily detect "an unbalanced load that will cause deterioration of the pole" by visual inspection.

[0023] 4 and 5 are diagrams illustrating a method for alleviating an unbalanced load using a bridge member 30 according to the second embodiment. In this embodiment, the unbalanced load P generated in a bridge component attached to a mounting portion is ｕ It will be explained how the deformation of the bridging member 30 reduces the unbalanced load applied to the pole 10.

[0024] FIG. 4 is a diagram illustrating a state in which an unbalanced load occurs on the pole 10 (before the crossing member 30 is deformed). Ｎ There is a tension difference between the cables 50 on both sides of the unbalanced load P ｕ In this case, the tension P （Ｎ，Ｎ＋１） In other words, the unbalanced load P ｕ Is, P ｕ =P（Ｎ，Ｎ＋１） -P （Ｎ－１，Ｎ） Here, the cable tension P （Ｎ，Ｎ＋１） is the span length S （Ｎ，Ｎ＋１） , sag d （Ｎ，Ｎ＋１） , can be expressed by the following equation using the weight W per unit length of the cable 50. Cable tension P （Ｎ－１，Ｎ） The same is true.

[0025] FIG. 5 is a diagram illustrating a state in which the unbalanced load is alleviated by deformation of the crossing member 30. In this embodiment, it is assumed that the crossing member 30 is deformed by an amount Δ horizontally to the ground G as shown in FIG. 5 due to the unbalanced load. In this case, the span length decreases to S(N, N+1)-Δ, and the sag increases to d(N, N+1)+α. Substituting this span length and sag into equation (1), the cable tension P' is obtained. （Ｎ，Ｎ＋１） It can be seen that decreases.

[0026] On the other hand, the cable tension P' （Ｎ－１，Ｎ） Therefore, the unbalanced load P ｕ 'I, P' （Ｎ，Ｎ＋１） -P' （Ｎ－１，Ｎ） Therefore, the unbalanced load P ｕ The value approaches 0. In other words, it can be seen that the unbalanced load is alleviated by the deformation of the bridge member 30.

[0027] (Embodiment 3) In this embodiment, a method for removing an unbalanced load generated on a pole will be described. This method involves: (Step 1) installing a bridging member 30 made of a material that is more easily deformed than a pole 10 erected on the ground G at the top of the pole 10 in a direction that increases the height of the pole 10; (Step 2) attaching a cable 50 to an attachment portion of the bridging member 30 that is located higher than the top of the pole 10; and (Step 3) removing the unbalanced load P generated in the cable 50 attached to the attachment portion. ｕ (Step 3) if the bridging member 30 is deformed, remove the cable 50 from the attachment portion and release it; and (Step 4) reattach the cable 50 that was once released to the attachment portion of the bridging member 30.

[0028] Steps 1 and 2 are the same as those described in the first and second embodiments. FIG. 6 is a flowchart illustrating steps 3 and 4. Steps S01 to S03 correspond to step 3, and steps S04 to S06 correspond to step 4. FIG. 7 shows the structure of the pole 10. Ｎ Unbalanced load P ｕ 10. This is a diagram illustrating steps S01 and S02 in a state where the pole 10 Ｎ The unbalanced load P ｕ Step S02: The deformation of the bridge member 30 when the unbalanced load (the upper limit of the unbalanced load set for the pole 10) that causes deterioration of the pole 10 is calculated as Δ Ｄ Let Δ be Δ Ｄ Immediately before this happens, plans are made to remove the unbalanced load.

[0029] FIG. 8 shows the pole 10 Ｎ 10 is a diagram illustrating a state in which the cable 50 stretched over the pole 10 has been removed. Ｎ The cable 50 is then removed from the pole 10. Ｎ 10. The cable 50 is again attached to the pole 10. This is a diagram illustrating steps S04 and S05. Step S04: The deformed bridging member 30a is replaced with a new bridging member 30. Step S05: The pole 10 Ｎ To prevent a difference in tension between the left and right cables 50 (P （Ｎ－１，Ｎ） =P （Ｎ，Ｎ＋１） Step S06: The installation is completed.

[0030] In this removal method, the deformation Δ of the bridge member 30 is the deformation Δ when the unbalanced load set on the pole 10 is the upper limit value. Ｄ By replacing the crossing member 30 with a new one before the pole reaches this point, the unbalanced load can be removed without causing deterioration to the pole itself. Conventionally, removal was considered after deterioration of the pole had occurred, which meant the pole itself had to be rebuilt, increasing material and construction costs, but this construction method can reduce these costs.

[0031] 10: Pole 30: Stretching member 30a: Deformed Stretching member 50: Cable 51: Accessories

Claims

1. An interference member installed at the top of a pole built on the ground, which is an interference member for increasing the height of the pole, and is characterized in that it is formed of a material that deforms more easily than the pole.

2. It has an attachment portion for attaching at least one of a cable and accessories as an interference component at a position higher than the top of the pole, and when the unbalanced load generated by the interference component attached to the attachment portion is the upper limit value of the unbalanced load set for the pole, it has a predetermined amount of deformation. The interference member according to claim 1, characterized in that.

3. It has an attachment portion for attaching at least one of a cable and accessories as an interference component at a position higher than the top of the pole, and the interference member according to claim 1, characterized in that the unbalanced load applied to the pole is alleviated by deforming due to the unbalanced load generated by the interference component attached to the attachment portion.

4. An interference method of installing an interference member formed of a material that deforms more easily than a pole built on the ground at the top of the pole and in a direction of increasing the height of the pole.

5. Attaching at least one of a cable and accessories as an interference component to an attachment portion of the interference member that is at a position higher than the top of the pole, and when the unbalanced load generated by the interference component attached to the attachment portion is the upper limit value of the unbalanced load set for the pole, the deformation of the interference member becomes a predetermined amount. The interference method according to claim 4, characterized in that.

6. Attaching at least one of a cable and accessories as an interference component to an attachment portion of the interference member that is at a position higher than the top of the pole, and alleviating the unbalanced load applied to the pole by deforming the interference member due to the unbalanced load generated by the interference component attached to the attachment portion. The interference method according to claim 4, characterized in that.

7. Attaching a cable to an attachment portion of the interference member that is at a position higher than the top of the pole, removing and releasing the cable from the attachment portion when the interference member deforms due to the unbalanced load generated by the cable attached to the attachment portion, and attaching the cable that has been once released again to the attachment portion of the interference member. The interference method according to claim 4, characterized in that.