WO2023032066A1 - 治具及び敷設方法 - Google Patents
治具及び敷設方法 Download PDFInfo
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- WO2023032066A1 WO2023032066A1 PCT/JP2021/032081 JP2021032081W WO2023032066A1 WO 2023032066 A1 WO2023032066 A1 WO 2023032066A1 JP 2021032081 W JP2021032081 W JP 2021032081W WO 2023032066 A1 WO2023032066 A1 WO 2023032066A1
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- WIPO (PCT)
- Prior art keywords
- jig
- branch line
- utility pole
- length
- ground
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/20—Side-supporting means therefor, e.g. using guy ropes or struts
Definitions
- the present disclosure relates to a jig attached to a utility pole and a method for laying the utility pole.
- existing utility poles have a hollow interior and a tapered shape in the longitudinal direction, are made of metal material or concrete material, and are installed for the purpose of laying cables in the sky.
- a branch line made of steel strands or the like is lowered from a specific location below the top of the utility pole to the ground at a certain distance from the utility pole, and the branch line is fixed to the ground with an anchor or the like.
- An anchor 16 or the like is sometimes laid to fix the branch line 15 to the ground 50 when constructing the utility pole.
- the above problems have been solved by replacing utility poles with unbalanced loads built in such narrow spaces with strong utility poles (self-supporting poles) that do not require branch lines.
- the self-supporting pole has a problem that the unit price is higher than that of a general utility pole, and the construction cost is high.
- the present invention provides a jig and a laying method for laying a branch line that can avoid contact with houses and passers-by and can eliminate the unbalanced load of a utility pole built in a narrow space. intended to
- a laying method provides a member for fixing a branch line from the top of a utility pole (hereinafter referred to as an upper branch line) and a branch line on the ground side (hereinafter referred to as a lower branch line) at the tip.
- a jig having a fixing member is fixed to the utility pole.
- the jig according to the present invention is a rod-shaped jig whose one end is attached to the surface of the utility pole so as to be perpendicular to the utility pole, The other end is provided with a first member holding an upper branch line connected to the top of the utility pole and a second member holding a lower branch line connected to the ground in parallel with the utility pole.
- the laying method according to the present invention includes: attaching one end of the jig to the surface of the utility pole so that the rod-shaped jig is perpendicular to the utility pole; connecting the other end of the jig and the top of the utility pole with an upper branch line; and connecting the other end of the jig and the ground with the lower branch line so that the lower branch line is parallel to the utility pole. , I do.
- the first member of the jig and the tip of the utility pole are connected by an upper branch line, and the second member of the jig and the ground are connected by a lower branch line perpendicular to the ground, so that the attachment angle of the upper branch line to the utility pole is adjusted. It is possible to install in a narrow place while securing and eliminating the unbalanced load of the utility pole. By securing an optimum separation distance between the utility pole and the lower branch line, the risk of contact with houses and passers-by can be reduced.
- the jig according to the present invention further includes an expansion mechanism that makes the length in the longitudinal direction variable.
- the laying method according to the present invention includes: calculating an unbalanced load on the utility pole; Acquiring the relationship between the length of the jig in the longitudinal direction and the amount of load generated by the upper branch line; Finding the length of the jig that eliminates the unbalanced load from the relationship; and Setting the length of the jig attached to the utility pole to the length found from the relationship. .
- variable mechanism that can adjust the length of the jig, it is possible to work more flexibly in narrow spaces suitable for the surrounding environment. long-term safe use and reduction of rebuilding costs can be realized.
- the present invention can provide a jig and a laying method for laying branch lines that can avoid contact with houses and passers-by and can eliminate the unbalanced load of utility poles built in narrow spaces.
- the jig 30 is a rod-shaped jig having one end 30a attached to the surface of the utility pole 10 so as to be perpendicular to the utility pole 10, At the other end 30b, a first member 31 holding an upper branch line 15-1 connected to the top portion 10a of the utility pole 10, and a second member 32 holding a lower branch line 15-2 parallel to the utility pole 10 and connected to the ground 50. and.
- the jig 30 has a first member 31 for fixing the upper branch line 15-1 and a second member 32 for fixing the lower branch line 15-2 to the other end 30b.
- the jig 30 is made of a metal material or the like, and has a columnar or cylindrical shape such as a round shape or a square shape.
- One end 30 a of the jig 30 is fixed to the surface of the utility pole 10 so that the central axis of the jig 30 is perpendicular to the central axis of the utility pole 10 .
- a band 33 is preferably used to fix the jig 30 .
- the first member 31 and the top part 10a (wire crossing part) of the utility pole 10 are connected by an upper branch line 15-1, and the second member 32 and the ground 50 are connected to the ground 50 vertically (parallel to the utility pole 10). Connected by branch line 15-2.
- the jig 30 further includes an expansion mechanism 34 that allows the length in the longitudinal direction to be variable.
- the telescopic mechanism 34 that can adjust the length of the jig 30 makes it possible to work more flexibly in a narrow space suitable for the surrounding environment, and by eliminating the unbalanced load in the narrow space, which has not been realized in the past, the utility pole can be installed. Long-term safe use and reduction of rebuilding costs can be realized.
- FIG. 4 is a flowchart for explaining the procedure of the laying method of this embodiment.
- This laying method is Attaching one end 30a of the jig 30 to the surface of the utility pole 10 so that the rod-shaped jig 30 is perpendicular to the utility pole 10 (step S01); connecting the other end 30b of the jig 30 and the top portion 10a of the utility pole 10 with the upper branch line 15-1 (step S02); connecting the end 30b and the ground 50 with the lower branch line 15-2 (steps S03, S04); I do.
- Step S ⁇ b>01 Fix one end 30 a of the jig 30 at a specific height from the ground of the utility pole 10 .
- Step S ⁇ b>03 Install the anchor 16 and the like on the ground 50 around the utility pole 10 .
- Step S04 A lower branch line 15-2 is stretched perpendicularly to the ground 50 from the other end 30b of the installed jig 30 and fixed to the anchor 16 or the like.
- Step S05 If the branch line connected to the jig 30 becomes loose, the effect of resolving the unbalanced load is reduced, so the tension of the branch line is adjusted. Thereby, the reaction force of the unbalanced load can be shared and eliminated.
- step S06 The length of the jig 30 is adjusted according to the magnitude of the unbalanced load applied to the utility pole.
- Step S06 is performed according to the following procedure. (Procedure 1) calculating the unbalanced load applied to the utility pole 10; (Step 2) Acquiring the relationship between the length of the jig 30 in the longitudinal direction and the amount of load generated by the upper branch line 15-1; (Procedure 3) finding the length of the jig 30 that eliminates the unbalanced load from the relationship, and (Procedure 4) finding the length of the jig 30 attached to the utility pole 10 from the relationship be set to
- the tension T of the cable laid on the utility pole 10 in no wind is represented by the following equation (1).
- W is the weight per unit length of the installed power line and communication line [kg]
- S is the horizontal distance to the adjacent utility pole [m]
- d is the slackness of the cable [m].
- the weight W 1 (N/m) of the cable per unit length considering the wind pressure load is given by the following equation (3).
- the unbalanced load T applied to the utility pole when the cable is laid can be obtained.
- the unbalanced load T applied to the utility pole is calculated by converting the influence of the wind.
- FIG. 5 is a diagram for explaining forces generated in the utility pole 10 on which the jig 30 is installed.
- the unbalanced load F is the force exerted on the utility pole 10 by the cable 11 laid on the utility pole 10 .
- h [m] is the height from the ground 50 of the mounting position of the jig 30
- H [m] is the height from the ground 50 of the mounting position of the upper branch line 15-1 to the utility pole 10
- the mounting angle is ⁇ [°] and the length of the jig 30 is a [m].
- the horizontal axis is the length a of the jig 30, and the vertical axis is the load amount P that can be shared by the upper branch line 15-1.
- the load on the utility pole depends on the type of utility pole, but is about 2 kN at the minimum. As shown in FIG. 6, the load amount varies depending on the length a of the jig 30. If the length a of the jig 30 is not adjusted, an unbalanced load of about 10% remains. Therefore, based on the relationship in FIG. 6, the length a of the jig 30 that generates the load amount P that cancels the unbalanced load T calculated in procedure 1 is found.
- step 4 The telescopic mechanism 34 of the jig 30 is adjusted so that the length a found in step 3 is obtained.
- the expansion mechanism 34 needs to be able to adjust the length a of the jig 30 on the order of 10 cm in order to eliminate an unbalanced load of about 10%.
- the jig 30 needs a function of flexibly adjusting the length a.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Suspension Of Electric Lines Or Cables (AREA)
Abstract
Description
他端に、前記電柱の頂上部と接続する上部支線を保持する第1部材と、前記電柱と平行に地面と接続する下部支線を保持する第2部材と、を備えることを特徴とする。
棒状の治具が電柱に対して垂直となるように前記電柱の表面に前記治具の一端を取り付けること、
前記治具の他端と前記電柱の頂上部とを上部支線で接続すること、及び
下部支線が前記電柱と平行となるように前記治具の他端と地面とを前記下部支線で接続すること、
を行う。
前記電柱に掛かる不平衡荷重を計算すること、
前記治具の長手方向の長さと前記上部支線で生じさせる載荷量との関係を取得しておくこと、
前記関係から前記不平衡荷重を解消する前記治具の前記長さを見出すこと、及び
前記電柱に取り付けた前記治具の前記長さを前記関係から見出した前記長さに設定すること
をさらに行う。
図2及び図3は、本実施形態の治具30を説明する図である。治具30は、電柱10に対して垂直となるように電柱10の表面に一端30aが取り付けられる棒状の治具であって、
他端30bに、電柱10の頂上部10aと接続する上部支線15-1を保持する第1部材31と、電柱10と平行に地面50と接続する下部支線15-2を保持する第2部材32と、を備えることを特徴とする。
図4は、本実施形態の敷設方法の手順を説明するフローチャートである。本敷設方法は、
棒状の治具30が電柱10に対して垂直となるように電柱10の表面に治具30の一端30aを取り付けること(ステップS01)、
治具30の他端30bと電柱10の頂上部10aとを上部支線15-1で接続すること(ステップS02)、及び
下部支線15-2が電柱10と平行となるように治具30の他端30bと地面50とを下部支線15-2で接続すること(ステップS03、S04)、
を行う。
ステップS02:電柱10の頂上部10a(線条架渉部:ケーブル等を引き留めている金物)から治具30の他端30bに対し上部支線15-1を張り、治具30を地面50と水平に固定する。
ステップS03:電柱10の周囲の地面50にアンカ16等を設置する。
ステップS04:設置された治具30の他端30bから地面50に対して垂直に下部支線15-2を張り、アンカ16等へ固定する。
ステップS05:治具30に接続した支線が弛むと、不平衡荷重を解消する効果が低減するため、支線の張力を調整する。これにより、不平衡荷重の反力を分担し、その解消を行うことができる。
(手順1)電柱10に掛かる不平衡荷重を計算すること、
(手順2)治具30の長手方向の長さと上部支線15-1で生じさせる載荷量との関係を取得しておくこと、
(手順3)前記関係から前記不平衡荷重を解消する治具30の前記長さを見出すこと、及び
(手順4)電柱10に取り付けた治具30の前記長さを前記関係から見出した前記長さに設定すること。
電柱10に敷設されているケーブルの無風時の張力Tは、下記(1)式により表される。
図5は、治具30を設置した電柱10において発生する力を説明する図である。この時、電柱10に敷設されているケーブル11が電柱10に及ぼす力が不平衡荷重Fとなる。治具30の取り付け位置の地面50からの高さをh[m]、上部支線15-1の電柱10への取り付け位置の地面50からの高さをH[m]、上部支線15-1の取付角度をθ[°]、治具30の長さをa[m]とする。
[数5]
P=Fsinθ (5)
また、角度θと長さaの関係は下記の(6)式のようになる。
[数6]
a=(H-h)tanθ (6)
例えば、治具30をH=6m、h=3mの位置に取り付け、支線張力をF=10kNで張った際に、治具30の長さa[m]と支線が担保できる載荷量P[kN]との関係は図6のようになる。
電柱の載荷量は電柱の種別に依るが、最小で2kN程度である。図6の関係のように治具30の長さaにより載荷量に違い発生するので、治具30の長さaを調整しないと10%前後の不平衡荷重が残置されることとなる。そこで、図6の関係を基に、手順1で計算した不平衡荷重Tを打ち消す載荷量Pを発生させる治具30の長さaを見出す。
10a:頂上部
15:支線
15-1:上部支線
15-2:下部支線
16:アンカ
20:家屋
30:治具
30a:一端
30b:他端
31:第1部材
32:第2部材
33:バンド
34:伸縮機構
50:地面
Claims (4)
- 電柱に対して垂直となるように前記電柱の表面に一端が取り付けられる棒状の治具であって、
他端に、前記電柱の頂上部と接続する上部支線を保持する第1部材と、前記電柱と平行に地面と接続する下部支線を保持する第2部材と、を備えることを特徴とする治具。 - 長手方向の長さを可変とする伸縮機構をさらに備えることを特徴とする請求項1に記載の治具。
- 棒状の治具が電柱に対して垂直となるように前記電柱の表面に前記治具の一端を取り付けること、
前記治具の他端と前記電柱の頂上部とを上部支線で接続すること、及び
下部支線が前記電柱と平行となるように前記治具の他端と地面とを前記下部支線で接続すること、
を行う敷設方法。 - 前記電柱に掛かる不平衡荷重を計算すること、
前記治具の長手方向の長さと前記上部支線で生じさせる載荷量との関係を取得しておくこと、
前記関係から前記不平衡荷重を解消する前記治具の前記長さを見出すこと、及び
前記電柱に取り付けた前記治具の前記長さを前記関係から見出した前記長さに設定すること
をさらに行うことを特徴とする請求項3に記載の敷設方法。
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4939865Y1 (ja) * | 1969-09-01 | 1974-11-01 | ||
US4638611A (en) * | 1986-01-06 | 1987-01-27 | Vaughn Charles R | Guy-wire guard assembly and fastening systems therefor |
-
2021
- 2021-09-01 JP JP2023544862A patent/JPWO2023032066A1/ja active Pending
- 2021-09-01 WO PCT/JP2021/032081 patent/WO2023032066A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4939865Y1 (ja) * | 1969-09-01 | 1974-11-01 | ||
US4638611A (en) * | 1986-01-06 | 1987-01-27 | Vaughn Charles R | Guy-wire guard assembly and fastening systems therefor |
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