JP2012205351A - Apparatus and method for supporting installation of lead-in wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly acquire degree of relaxation, tensile force and ground height at an arbitrary point and secure a construction quality by measuring a ground height of an electric wire when considering to satisfy a strength of a lead-in wire support point to be determined at a time of designing.SOLUTION: A relaxation rate arithmetic part 25 selects a standard relaxation rate corresponding to a span length of an electric wire installation and to a thickness of the electric wire to be installed from a standard relaxation rate storage part 18, and also selects a tensile limit relaxation rate from a tensile limit relaxation rate storage part 19 so as to output them to a display device 17 to be displayed. A support point tensile force calculation part 29 calculates a support point tensile force on an electric pole side and a support point tensile force on a house side based on the span length, the height of the supporting point on the electric pole side, the height of the supporting point on the house side, and the standard relaxation rate and the tensile limit relaxation rate selected by the relaxation rate arithmetic part so as to output them to the display device 17 to be displayed. A ground height calculation part 31 calculates a ground height at an arbitrary point between the span length based on the span length, the height of the supporting point on the electric pole side, the height of the supporting point on the house side, and the standard relaxation rate and the tensile limit relaxation rate selected by the relaxation rate arithmetic part so as to output it to the display device 17 to be displayed.

Description

  The present invention relates to a lead-in wire overhead support device and method for supporting the construction of a wire overhead so that the support point tension and the ground clearance at the lowest point satisfy a threshold when the lead-in wire is overhead.

  In general, the construction work of the lead-in wire is carried out with the standard slackness, paying sufficient attention to the strength of the lead-in wire support point, because the strength of the electric wire can be sufficiently secured even if the wind pressure load and tension applied to the lead-in wire are taken into account. . About the lead-in wire support point strength, the standard sag is set by the length between the wire thickness and the support point so as to be 980 N or less from the past knowledge.

  In addition, when the length of the service line exceeds the specified value, auxiliary support such as a service column is installed on the customer side so that the service line is within the specified value, or the support point strength is confirmed by the service line tension calculation individually. Besides, the sag is set individually. Here, there is an electric wire overhead line in which the overhead wire construction is performed so that the tension at the attachment point of the electric wire is within a specified value (for example, see Patent Documents 1 and 2).

JP-A-5-83819 JP 2007-252026 A

  However, Patent Documents 1 and 2 are applied to a power transmission line and cannot be applied to a lead-in line as they are. When the length of the lead-in wire exceeds a predetermined value, the support point strength that can sufficiently withstand the tension obtained by individually setting the lead-in wire slackness is necessary, but measurement with a tensiometer is difficult. As a feasible tension confirmation method, the tension can be calculated by measuring the lowest point of the electric wire from the relationship between the sag and the tension. Thereby, construction quality can be secured.

  However, depending on the facility type of the electric wire, the position of the lowest point may not be physically measured. For example, when the position of the lowest point cannot be measured because it is on a road with heavy traffic, the position of the lowest point cannot be measured.

  The purpose of the present invention is to accurately grasp the sag and tension and the ground clearance at any point in the study to satisfy the strength of the support point for the lead-in wire determined at the time of construction, and to measure the construction quality by measuring the ground clearance of the wire. It is to provide a lead-in wire overhead support device and method capable of ensuring quality.

  The lead-in wire overhead support device according to the invention of claim 1 has a house-side attachment point tension equal to or less than a predetermined tension regulation value in association with the span between the wires from the power pole side to the house side and the wire thickness to be wired. The standard sag rate storage unit that stores the standard sag rate obtained by converting the sag rate into an integer, the tension limit sag rate storage unit that stores the tension limit sag rate in advance, and an electric wire input from the input device The standard sag rate corresponding to the span to be spanned and the wire thickness to be wired is selected from the standard sag rate storage unit, and the tension limit sag rate is selected from the tension limit sag rate storage unit and displayed on the display device. The sag rate calculating unit, the span input from the input device, the height of the utility pole side support point, the height of the house side support point, the standard sag rate and tension selected by the sag rate calculation unit Calculates and displays utility pole side support point tension and house side support point tension based on the limit sag rate The support point tension calculation unit that displays and outputs to the device, the span input from the input device, the height of the utility pole side support point, the height of the house side support point, and the standard relaxation selected by the sag rate calculation unit. A ground height calculation unit is provided that calculates the ground height at an arbitrary position between the spans based on the degree of elasticity and the tension limit sag rate, and displays the ground height on a display device.

  The lead-in wire overhead support device according to the invention of claim 2 is the support point tension threshold storage unit that stores in advance the threshold value of the support point tension of the support point over which the electric wire is wired, and the support point tension calculation unit according to the invention of claim 1. The power pole side support point tension and the house side support point tension calculated in step 1 are determined to be within the support point tension threshold stored in the support point tension threshold storage unit, and the determination result is displayed on the display device. And a point tension determination unit.

  The lead-in wire overhead support apparatus according to the invention of claim 3 is the invention according to claim 1 or 2, wherein the height of the utility pole side support point, the height of the house side support point input from the input device, and the sag rate calculation An actual wire length calculation unit that calculates the actual wire length between the diameters based on the standard sag rate and tension limit sag rate selected in the unit, and displays the difference on a display device. And

  The lead-in wire overhead support device according to a fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein the sag rate calculation unit is an input device for the standard sag rate and the tension limit sag rate. When an increase / decrease command is input from, an increased / decrease standard sag rate and tension limit sag rate are selected.

  The lead-in wire overhead support device according to the invention of claim 5 is the invention according to claims 1 to 4, wherein the ground height calculation unit is on the ground over the entire area between the utility pole side support point and the span of the house side support point. The height is calculated, and the ground height graph of the electric wire is displayed and output on a display device.

  The lead-in wire overhead support method according to the invention of claim 6 includes a house-side attachment point tension equal to or lower than a predetermined tension regulation value in association with a span between wires from the power pole side to the house side and a wire thickness to be wired. The standard sag rate obtained by converting the sag rate into an integer is stored in the standard sag rate storage unit in advance, and the tension limit sag rate indicating the sag rate is stored in the tension limit sag rate storage unit. The standard sag rate corresponding to the span between the wires and the wire thickness to be laid is selected from the standard sag rate storage unit and the tension limit sag rate storage unit is selected from the tension limit sag rate storage unit. Display pole output, the pole support point tension based on the span of the wire, the height of the utility pole side support point, the height of the house side support point, the selected standard sag rate and the tension limit sag rate And the support side tension of the house side is calculated and displayed and output. Based on the height of the holding point, the height of the house side support point, the selected standard sag rate and the tension limit sag rate, the ground height at any position between the spans is calculated, displayed, output, and retracted. It is characterized by supporting a lead-in wire that satisfies the strength of the support point.

  According to a seventh aspect of the present invention, there is provided a lead-in wire overhead support method according to the sixth aspect, wherein a support point tension threshold value of a support point for laying an electric wire is previously stored in a support point tension threshold storage unit, and the support point tension is stored. It is determined whether the utility pole side support point tension and the house side support point tension calculated by the calculation unit are within the support point tension threshold stored in the support point tension threshold storage unit, and the determination result is displayed and output. It is characterized by supporting a lead-in wire that satisfies the strength of the support point.

  The service line support method according to the invention of claim 8 is the method of claim 6 or 7, wherein the height of the utility pole side support point, the height of the house side support point, the selected standard sag rate and tension. The actual wire length between the above-mentioned diameters is calculated based on the limit sag rate, and the difference is displayed on the display device to support the lead-in wire that satisfies the pull-in support point strength.

  The service line support method according to the invention of claim 9 is the invention of any one of claims 6 to 8, wherein when there is an increase / decrease command with respect to the standard sag rate and the tension limit sag rate, A standard sag rate and a tension limit sag rate increased or decreased are selected.

  The lead-in wire overhead support method according to the invention of claim 10 is the invention according to any one of claims 6 to 9, wherein the ground clearance is increased over the entire area between the utility pole-side support point and the span of the house-side support point. It calculates and displays the ground height graph of the electric wire.

  According to the first and sixth aspects of the invention, the tension limit sag rate, the utility pole side support point tension, the house side support point tension, and the ground height at any position between the spans are displayed and output. The construction quality that satisfies the strength can be guaranteed.

  According to invention of Claim 2 and 7, the determination result whether the utility pole side support point tension and the house side support point tension are within the threshold value of the support point tension, the ground point of the lowest point of the electric wire and the arbitrary point Since the display is output, it is possible to easily grasp the support point tension of the lead-in wire that satisfies the threshold and the ground clearance of the lead-in wire.

  According to the inventions of claims 3 and 8, since the actual wire length and the difference between the diameters of the standard sag and the tension limit sag are displayed and output, the actual wire length and the slack adjustment length of the lead-in wire can be easily grasped. it can.

  According to the inventions of claims 4 and 9, since the standard sag rate and the tension limit sag rate can be increased or decreased, the support point tension, the ground clearance of the wire, and the wire length are calculated with the increased or decreased arbitrary sag. it can.

  According to the fifth and tenth aspects of the present invention, since the ground height graph of the electric wire is displayed and output, the ground height of the electric wire in the span can be easily grasped.

The lineblock diagram of the service line overhead line support device concerning the embodiment of the present invention. Explanatory drawing of the span which wires the electric wire from the utility pole side to the house side. The top view which shows an example of the input screen of the data input into the service line overhead line assistance apparatus which concerns on embodiment of this invention. Explanatory drawing of the standard sag ratio table memorize | stored in the standard sag ratio memory | storage part in embodiment of this invention. Explanatory drawing of the tension limit sag rate table memorize | stored in the tension limit sag rate memory | storage part in embodiment of this invention. The top view which shows an example of the display screen of the support point tension | tensile_strength in embodiment of this invention. The top view which shows an example of the display screen of the ground height calculation in embodiment of this invention. The ground height graph of the electric wire in the case of the data of the input screen shown in FIG. The ground height graph of the electric wire when the low support point is changed in the data of the input screen shown in FIG.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a lead-in wire overhead support device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of spans for connecting wires from a utility pole side to a house side.

  First, a description will be given of the span in which the electric wire from the utility pole side to the house side is installed. In FIG. 2, the case where the electric wire 13 of the lead-in wire is drawn between the diameters from the utility pole side support point A of the utility pole 11 to the house side support point B of the house 12 is shown. Now, the height of the utility pole side support point A is higher than the height of the house side support point B, the height of the utility pole side support point A is h1 (hereinafter referred to as the height h1 of the high support point A), and the house side support point B. The height difference H between the high support point A and the low support point B is H = h1−h2, where h2 is the height h2 (hereinafter referred to as the height h2 of the low support point B).

The distance between the high support point A and the low support point B is S, the distance from the high support point A to the arbitrary point E is x, the distance from the high support point A to the lowest point F of the wire is Sh, the wire Let the sag of 13 be D ₀ . The sag D _{0 of the} electric wire 13 is indicated by a distance from a straight line G connecting the high support point A to the low support point B at a position C that is a half of the span from the high support point A. Further, the ground height at an arbitrary point E at a distance x from the high support point A is defined as hx.

Next, the ground clearance at the lowest point F of the wire 13 is H1, the slackness of the wire at the lowest point F is D _L , the horizontal tension at the lowest point F is T, and an arbitrary x distance from the high support point A Let y be the difference between the ground clearance hx at the arbitrary point E and the ground clearance H1 at the lowest point of the electrical wire. The horizontal tension T at the lowest point F is the same as the horizontal tension T at the high support point A and the low support point B. Also, the high support point tension at the high support point A is TA, and the low support point tension at the low support point B is TB.

First, the horizontal tension T at the high support point A and the low support point B is expressed by equation (1), the slackness D _L at the lowest point is expressed by equation (2), and the sag D ₀ is expressed by equation (3). Indicated by

T = (W · S ² / D ₀ ) × 9.8 [N] (1)
D _L = D ₀ (1−H / 4D ₀ ) [m] (2)
D ₀ = S · K [m] (3)
However, W: Weight of wire, S: Diameter, H: Height difference between high support point A and low support point B, K: Sag rate
Wr = √ (W + 0.0025 ・ φ)
Wr: Wind pressure load per meter of wire φ: Outer diameter Next, the high support point tension TA at the high support point A is shown by the equation (4), and the low support point tension TB at the low support point B is (5) It is shown by the formula.

TA = T + {W · (H + D _L )} × 9.8 [N] (4)
TB = T + (W · D _L ) × 9.8 [N] (5)
Substituting Eq. (3) into Eq. (2), and further substituting height difference H between high support point A and low support point B into H = h1-h2 (h1: height of high support point A, h2: low support When the height of the point B) is substituted into the equations (4) and (5), the high support point tension TA is expressed by the equation (6), and the low support point tension TB at the low support point B is (7) It is shown by the formula.

TA = [(W · S ² / S · K) + W · {h1−h2 + S · K (1− (h1−h2) / 4S · K)}] × 9.8 (6)
TB = [(W • S ² / S • K) + W • S • K {1− (h1−h2) / 4S • K}] × 9.8 [N] (7)
Next, the ground height H1 at the lowest point of the electric wire is expressed by equation (8).

H1 ＝ h2−D _L
= H2−D ₀ (1−H / 4D ₀ )
= H2−S ・ K (1−H / 4S ・ K) (8)
Therefore, the ground height H1 at the lowest point of the electric wire is expressed by the equation (9), where the height difference H between the high support point A and the low support point B is H = h1−h2.

H1 = h2−S · K {1− (h1−h2) / 4S · K} (9)
On the other hand, when the wire ground height hx at an arbitrary point E at an arbitrary x distance from the high support point A is y, the difference from the ground height H1 at the lowest point of the wire (hereinafter referred to as the lowest point ground height difference) is y. , (10).

hx = H1 + y (10)
Here, the ground clearance difference y at the lowest point is expressed by equation (11).

y = 4D ₀ / S ² × (Sh−x) ² [m] (11)
However, Sh: distance from the high support point A to the lowest point F Here, the distance Sh from the high support point A to the lowest point F is expressed by equation (12).

Sh = (S / 2) × (1 + H / 4D ₀ ) [m] (12)
Substituting equation (12) into equation (11) and further substituting equation (3), the lowest point ground height difference y is expressed by equation (13).

y = 4S · K / S ² × {(S / 2) × (1 + H / 4S · K) −x} ² [m] (13)
When the expressions (9) and (13) are substituted into the expression (10), the wire ground height hx at an arbitrary point E at an arbitrary x distance from the high support point A is expressed by an expression (14).

hx = h2−S · K {1− (h1−h2) / 4S · K}
+ 4S · K / S ² × {(S / 2) × (1+ (h1−h2) / 4S · K) −x} ² [m] (14)
The actual wire length L is expressed by equation (15).

L = S + 8D ₀ ² / 3S + H ² / 2S
= S + 8 (S ・ K) ² / 3S + (h1−h2) ² / 2S [m] (15)
Next, with reference to FIG. 1, the structure of the lead-in wire overhead line assistance apparatus which concerns on embodiment of this invention is demonstrated. The lead-in line overhead line support device is configured by a computer, for example, a personal computer. That is, the electric wire support program is installed in a computer including the input device 14, the storage device 15, the arithmetic control device 16, and the display device 17, and the arithmetic control device 16 executes the electric wire support program so that 1 is realized.

  The storage device 15 includes a standard sag rate storage unit 18 that stores a standard sag rate K1 in advance in association with the span S and the wire thickness Φ for connecting the wires 13 from the utility pole side to the house side, The tension limit sag rate storage unit 19 that stores the tension limit sag rate K2 in advance in association with the gap S and the wire thickness Φ, and the support points (high support point A and low support point B) for connecting the wires. And a support point tension threshold value storage unit 20 which stores a threshold value of the point tension T in advance. The tension limit sag rate K2 is a sag rate corresponding to the support point tension threshold.

  The input device 14 is, for example, a keyboard or a mouse. In order to grasp the supporting point tension TA, TB and the ground height of the electric wire when connecting the electric wire, the input device 14 has a span S, an electric wire thickness Φ, and a high supporting point A. Data such as the height h1, the height h2 of the low support point B, and the distance x of the arbitrary point E are input.

  FIG. 3 is a plan view showing an example of an input screen for data such as the span S, the wire thickness Φ, the height h1 of the high support point A, the height h2 of the low support point B, and the distance x of the arbitrary point E. is there. When a command for starting up the input screen shown in FIG. 3 is input from the input device 14 to the input processing unit 22 of the arithmetic control device 16, the input processing unit 22 activates the display processing unit 23, and the display processing unit 23 displays the display device. The input screen 24 shown in FIG.

  When the input screen 24 is displayed, numerical values are input from the input device 14 to the distance x of the span, the high support point A (h1), the low support point B (h2), and the arbitrary point E, which are input items. The electric wire column is provided with an electric wire selection button 26 for selecting the type of electric wire so that the type of electric wire can be selected. When the electric wire selection button 26 is operated, for example, a list of electric wire types is displayed, and an electric wire thickness Φ is input by selecting an electric wire from the electric wire type list.

In FIG. 3, 25m is input to the span S in the input item column, 10m to the high support point A (h1), 4m to the low support point B (h2), 9m to the distance x of the arbitrary point E, and 3DV22 ( This shows the case where a wire with a diameter of 22 mm ² ) is selected. Note that the electric wire thickness Φ is expressed as the electric wire diameter or cross-sectional area as the electric wire type.

  When the data is input to the input items, the sag rate calculating unit 25 determines the span S and the wire thickness Φ over which the input wire is wired, and corresponds to the span S and the wire thickness Φ. The standard sag rate K1 is selected from the standard sag rate storage unit 18 as an initial value, and the tension limit sag rate K2 is selected from the tension limit sag rate storage unit 19 as an initial value. The standard sag rate K1 selected by the sag rate calculating unit 25 is displayed in the standard sag rate column, and the tension limit sag rate K2 is displayed in the tension limit sag rate column. In FIG. 3, the standard sag rate K1 is 5.0%, and the tension limit sag rate K2 is 6.0%.

  FIG. 4 is an explanatory diagram of a standard sag rate table stored in the standard sag rate storage unit 18. The standard sag rate K1 is stored in the standard sag rate table, and the standard sag rate K1 includes a standard sag rate K1a based on a manual standard and a standard sag rate K1b based on application span expansion. The standard sag rate K1a according to the manual standard is a conventional standard sag rate and is defined in advance according to the thickness and length of the electric wire. On the other hand, the standard sag rate K1b due to the application span expansion is a standard sag rate associated with the expansion of the application span according to the embodiment of the present invention, and is determined in advance corresponding to the expanded application span. Standard sag rate.

In the case of FIG. 3, since the span input from the input screen 24 is 25 m and the wire thickness is 22 mm ² , the sag rate calculation unit 25 is stored in the standard sag rate storage unit 18 shown in FIG. With reference to the stored standard sag rate K1, a standard sag rate of 5.0% with a span of 25 m and a wire thickness of 22 mm ² is selected as an initial value.

  FIG. 5 is an explanatory diagram of a tension limit sag rate table stored in the tension limit sag rate storage unit 19. The tension limit sag rate K2 is stored in the tension limit sag rate table, and this tension limit sag rate K2 is the same as the standard sag rate K1, and the manual standard tension limit sag rate K2a and the applicable diameter There is a tension limit sag rate K2b due to the expansion. The tension limit sag rate K2a according to the manual standard is a limit sag rate satisfying the supporting point tensions TA and TB with respect to the conventional standard sag rate. On the other hand, the tension limit sag rate K2b due to the expansion of the applicable span satisfies the supporting point tensions TA and TB with respect to the tension limit sag rate K2 associated with the expansion of the applicable span according to the embodiment of the present invention. It is the limiting sag rate, and is a sag rate calculated in advance based on the supporting point tensions TA and TB.

In the case of FIG. 3, since the span input from the input screen 24 is 25 m and the wire thickness is 22 mm ² , the sag rate calculation unit 25 is the tension limit sag rate storage unit 19 shown in FIG. Referring to the tension limit sag rate K2 stored in the table, a tension limit sag rate 6.0% with a span of 25 m and a wire thickness of 22 mm ² is selected as an initial value.

  As described above, when data is input to the input items of the input screen 24, the sag rate calculating unit 25 calculates the standard sag rate K1 corresponding to the span S and the wire thickness Φ as the standard sag rate storage unit 18. Is selected from the tension limit sag rate storage unit 19. The display processing unit 23 adds the span S, the height h1 of the high support point A, the height h2 of the low support point B, the distance x of the arbitrary point E, and the wire thickness Φ input from the input device, The standard sag rate K1 selected by the sag rate calculating unit 25 is displayed as an initial value in the standard sag rate column of the sag rate, and the tension limit sag rate K2 is displayed in the column of the tension limit sag rate. .

  Here, a tension limit sag rate increase / decrease button 27 is provided in the column of the tension limit sag rate, and when the tension limit sag rate increase / decrease button 27 is operated, the tension limit sag rate K2 can be changed. . Similarly, a standard sag rate increase / decrease button 28 is provided in the standard sag rate column, and when the standard sag rate increase / decrease button 28 is operated, the standard sag rate K1 can be changed. When the increase / decrease command is input from the tension limit sag rate increase / decrease button 27, the sag rate calculation unit 25 selects the increased / decreased tension limit sag rate K2, and the increase / decrease command is input from the standard sag rate increase / decrease button 28. If so, select the increased or decreased standard sag rate K1.

  Next, the support point tension calculation unit 29 of the calculation control device 16 includes the span S, the height h1 of the high support point A, the height h2 of the low support point B, and the sag rate calculation unit input from the input device 14. Based on the standard sag rate K1 and the tension limit sag rate K2 selected in 25, the high support point tension TA and the low support point tension TB are calculated.

  The high support point tension TA is calculated by equation (6). In the equation (6), the wire weight W is determined if the type and length of the wire are known. That is, the wire self-weight W determined in advance considering the span S and the sag rate K (standard sag rate K1, tension limit sag rate K2) for each type of wire. Further, the electric wire self-weight W may be used in consideration of wind pressure load. Then, enter the standard sag rate K1 as the sag rate K to calculate the high support point tension TA1 when the standard sag rate K1, and enter the tension limit sag rate K2 as the sag rate K. The high support point tension TA2 at the tension limit sag rate K2 is calculated.

  On the other hand, the low support point tension TB is calculated by the equation (7). Also in the equation (7), as in the case of the equation (6), the wire weight W is determined if the type and length of the wire are known, so the span S and the sag rate K (standard relaxation) are determined for each type of wire. The predetermined weight W of the wire is used in consideration of the rate K1 and the tension limit sag rate K2). Then, input the standard sag rate K1 to the sag rate K to calculate the low support point tension TB1 at the standard sag rate K1, and input the tension limit sag rate K2 to the sag rate K. Calculate the low support point tension TB2 at the tension limit sag rate K2.

  The support point tensions TA1 and TB1 at the standard sag rate K1 calculated by the support point tension calculation unit 29 and the support point tensions TA2 and TB2 at the tension limit sag rate K2 are the display processing unit 23 and the support point tension. Input to the determination unit 30.

  The support point tension determination unit 30 supports the support point tensions TA1 and TB1 when the standard sag rate K1 and the support point tensions TA2 and TB2 when the tension limit sag rate K2 are stored in the support point tension threshold storage unit 20. It is determined whether or not it is within a point tension threshold (for example, tension default value 980 N), and the determination result is output to the display processing unit 23.

  The display processing unit 23 displays the support point tensions TA1 and TB1 at the standard sag rate K1 and the support point tensions TA2 and TB2 at the tension limit sag rate K2 together with the determination result of the support point tension determination unit 30 on the display device 17. Output to.

  FIG. 6 is a plan view showing an example of a display screen of the supporting point tensions TA1 and TB1 at the standard sag rate K1 and the high supporting point tensions TA2 and TB2 at the tension limit sag rate K2. FIG. 6 shows a case in which the wire weight W when a wind type wind pressure load is applied is used. As shown in FIG. 6, the high support point tension TA has a high support point tension TA2 of 978.3 N at a tension limit sag rate K2, which is smaller than the predetermined tension value 980 N, and is safe. The rate is also 4.2, which is larger than the specified value 2.2. Further, the high support point tension TA1 at the standard sag rate K1 is 783.4 N, which is smaller than the predetermined tension value 980 N, and the safety factor is 5.2, which is the specified value 2.2. It is a bigger value. Therefore, it can be seen that both the standard sag rate K1 and the tension limit sag rate K2 are suitable. If it is determined by the support point tension determination unit 30 that it is not suitable, a warning is output. For example, an item that does not conform based on the determination result is displayed by changing the color or changing the background color to notify that the item is not suitable.

  Similarly, the low support point tension TB has a low support point tension TB2 of 973.5 N at the tension limit sag rate K2, which is smaller than the predetermined tension value of 980 N, and the safety factor is 4. 2, which is larger than the specified value 2.2. In addition, the low support point tension TB1 at the standard sag rate K1 is 778.7N, which is smaller than the tension default value 980N, and the safety factor is 5.3, which is the specified value 2.2. It is a bigger value. Therefore, it can be seen that both the standard sag rate K1 and the tension limit sag rate K2 are suitable. If it is determined by the support point tension determination unit 30 that it is not suitable, a warning is output. For example, an item that does not conform based on the determination result is displayed by changing the color or changing the background color to notify that the item is not suitable.

  As described above, if the tension limit sag rate increase / decrease button 27 is operated, the tension limit sag rate K2 can be changed, and if the standard sag rate increase / decrease button 28 is operated, the standard sag rate K1 can be changed. The unit 29 can calculate the high support point tensions TA1 and TA2 based on the standard sag rate K1 and the tension limit sag rate K2 changed from the initial values. Therefore, by changing the sag rate, it is possible to select an appropriate sag rate that satisfies the supporting point tensions TA1, TB1 at the standard sag rate K1 and the high supporting point tensions TA2, TB2 at the tension limit sag rate K2. .

Next, the ground height calculation unit 31 of the calculation control device 16 includes the span S, the height h1 of the high support point A, the height h2 of the low support point B, and the sag rate calculation unit 25 input from the input device 14. The wire ground height hx at an arbitrary point E between the spans is calculated based on the standard sag rate K1 and the tension limit sag rate K2 selected in (1). In addition, the ground clearance H1 and the sag D ₀ are calculated together.

  The ground clearance hx at the arbitrary point E between the spans is calculated by the equation (14). In equation (14), input the standard sag rate K1 to the sag rate K and calculate the wire ground height hx1 at the standard sag rate K1, and the tension limit sag rate K2 to the sag rate K Input and calculate the ground clearance hx2 at the tension limit sag rate K2.

  The lowest point ground clearance H1 is calculated by equation (9). In equation (9), input the standard sag rate K1 to the sag rate K and calculate the lowest ground clearance H11 when the standard sag rate K1. Enter K2 and calculate the lowest ground clearance H12 at the tension limit sag rate K2.

The sag degree D ₀ is calculated by equation (3). In equation (3), the standard sag rate K1 is input to the sag rate K to calculate the sag D ₀ 1 at the standard sag rate K1, and the sag rate K is the tension limit sag rate K2. Is input to calculate the sag D ₀ 2 at the tension limit sag rate K2.

The ground clearances hx1, hx2 when the sag rates K1, K2 calculated by the ground height calculation unit 31 are the lowest point ground heights H11, H12, sag rates K1, K2 when the sag rates K1, K2 are The sag degrees D ₀ 1 and D ₀ 2 are input to the display processing unit 23.

The display processing unit 23 calculates the ground ground heights hx1 and hx2 when the sag rates K1 and K2 are calculated by the ground height calculation unit 31, and the lowest ground heights H11 and H12 when the sag rates K1 and K2 are low. The sag degrees D ₀ 1 and D ₀ 2 at the rates K1 and K2 are output to the display device 17.

  Further, the actual wire length calculation unit 33 receives the height h1 of the high support point A, the height h2 of the low support point B input from the input device 14, and the standard sag rate selected by the sag rate calculation unit 25. The actual wire length L between spans is calculated based on K1 and the tension limit sag rate K2.

  The actual wire length L is calculated by the equation (15). In equation (15), the standard sag rate K1 is input to the sag rate K to calculate the actual wire length L1 when the standard sag rate K1, and the sag rate K to the tension limit sag rate K2 To calculate the actual wire length L2 at the tension limit sag rate K2. The actual wire lengths L1 and L2 calculated by the actual wire length calculator 33 are input to the display processor 23. The display processing unit 23 displays the actual wire lengths L 1 and L 2 calculated by the actual wire length calculation unit 33 on the display device 17. Further, the actual wire lengths L1 and L2 calculated by the actual wire length calculation unit 33 are output to the support point tension calculation unit 29, and the support point tension calculation unit 29 is calculated by the actual wire length calculation unit 33. The own wire weight W may be calculated using the actual wire lengths L1 and L2 when the sag rates K1 and K2 are used.

FIG. 7 shows the ground clearances hx1 and hx2 when the sag rates K1 and K2 calculated by the ground height calculation unit 31 are the lowest ground heights H11 and H12 and sag rates when the sag rates K1 and K2 are An example of the display screen of the slackness D ₀ 1 and D ₀ 2 at the time of K1 and K2 and the slackness ratios K1 and K2 calculated by the actual wire length calculation unit 33 and the actual wire lengths L1 and L2 at the time of K2 is shown. It is a top view.

As shown in FIG. 7, the sag D ₀ 2 at the tension limit sag rate K2 is 1.000 m, and the sag D ₀ 1 at the standard sag rate K1 is 1.250 m. Ground height hx2 at arbitrary point E at tension limit sag rate K2 at distance x (9m from high support point A) at arbitrary point E is 6.918m, ground height hx1 at arbitrary point E at standard sag rate K1 Is 6.688m.

  Further, the lowest ground clearance H11 when the tension limit sag rate K2 is 4.000 m, and the lowest ground clearance H12 when the standard sag rate K1 is 4.000 m. This is because the height h2 of the low support point B is 4.000 m. Accordingly, it is possible to easily determine that the ground height threshold (for example, the road crossing section predetermined value 5 m) is determined from the graph display and secured at the arbitrary point E.

  In addition, the actual wire length L2 at the tension limit sag rate K2 is 25.827 m, the actual wire length L1 at the standard sag rate K1 is 25.887 m, and the difference is 0.060 m.

  As described above, the ground height calculation unit 31 calculates the wire ground height hx at an arbitrary point E between the spans (a position at a distance x from the high support point A) by the equation (14). Therefore, the wire ground height hx may be calculated over the entire span from the high support point A to the low support point B, and the wire ground height graph may be displayed on the display device 17.

FIG. 8 is a ground height graph of the electric wire in the case of the data of the input screen shown in FIG. That is, the span S in the input field is 25 m, the high support point A (h 1) is 10 m, the low support point B (h 2) is 4 m, the distance x of the arbitrary point E is 9 m, and the wire is 22 mm ² in thickness. In this case, a graph of the wire ground height hx2 when the tension limit sag rate K2 is shown, and the wire ground height hx1 when the standard sag rate K1 is shown.

  At the ground clearance hx2 at the tension limit sag rate K2, the ground clearance at a position x (a distance of 9 m) from the high support point A is 6.918 m, and the ground clearance height hx2 is the ground clearance threshold (for example, 5 m). ) Is a position 16.1 m from the high support point A.

  On the other hand, the ground clearance hx1 at the standard sag rate K1 is 6.688 m at the position of the distance x from the high support point A (position of 9 m), and the ground clearance hx1 is the ground clearance threshold (for example, The position of 5 m) is a position 17.3 m from the high support point A.

  As described above, when the wire ground height hx is displayed as a graph over the entire span from the high support point A to the low support point B, the ground height of the wire between the spans can be easily grasped. Accordingly, it is possible to grasp the ground clearance at a position where measurement cannot be performed on site.

  FIG. 9 is a ground height graph of the electric wire when the low support point B (h2) is 5 m in the data of the input screen shown in FIG. That is, compared to the case of FIG. 8, when the low support point B (h2) is changed from 4 m to 5 m, the wire ground height hx2 at the tension limit sag rate K2 and the wire at the standard sag rate K1 A graph of ground clearance hx1 is shown.

  With the change of the low support point B (h2) from 4m to 5m, the ground clearance at the distance x from the high support point A (position 9m) at the wire ground height hx2 when the tension limit sag rate K2 is The ground clearance is 7.048m for the ground clearance hx1 when the standard sag rate K1 is 7.278m.

  Thus, the ground clearance height hx is displayed as a graph over the entire span from the high support point A to the low support point B, and the input items shown in FIG. When the values of h1, height h2 of low support point B, distance x of arbitrary point E, wire type (wire thickness Φ), tension limit sag rate K2, standard sag rate K1} are changed, Changes its characteristics. Therefore, it is possible to easily and intuitively understand how the ground clearance hx changes due to the change of the input item.

  Further, when the values of the input items shown in FIG. 3 are changed, the values of the high support point tension TA and the low support point tension TB shown in FIG. 6 also change, and when these exceed a predetermined threshold value, an alarm is displayed. Therefore, the value of the input item can be changed within a range where the high support point tension TA and the low support point tension TB do not exceed the threshold values.

Similarly, when the value of the input item shown in FIG. 3 is changed, the wire ground height hx, the lowest point ground height H1, the sag D ₀ , and the actual wire length L shown in FIG. It is possible to easily grasp how much these change by changing the value of. Further, since the alarm is displayed when the lowest ground clearance H1 does not satisfy the threshold, the value of the input item can be changed so that the lowest ground clearance H1 satisfies the threshold.

  As described above, according to the embodiment of the present invention, the span S of the lead-in wire, the height h1 of the high support point A of the utility pole, the height h2 of the low support point B on the house side, and the like are actually measured. Since the tensions at the high support point A and the low support point B are calculated, the support point tensions TA and TB can be easily confirmed even if the tension at the support points A and B cannot be measured at the construction stage. Therefore, the construction satisfying the threshold values of the supporting point tensions TA and TB becomes possible.

  Also, since the ground height hx at an arbitrary point E can be calculated, the ground clearance height H1 at the lowest point can be easily grasped, and a graph of the ground clearance height hx can also be displayed. Therefore, the construction in which the lowest ground clearance H1 satisfies the threshold can be easily performed.

DESCRIPTION OF SYMBOLS 11 ... Electric pole, 12 ... House, 13 ... Electric wire, 14 ... Input device, 15 ... Memory | storage device, 16 ... Calculation control apparatus, 17 ... Display apparatus, 18 ... Standard sag rate memory | storage part, 19 ... Tension limit sag rate memory | storage , 20 ... support point tension threshold storage unit, 22 ... input processing unit, 23 ... display processing unit, 24 ... input screen, 25 ... sag rate calculation unit, 26 ... wire selection button, 27 ... tension limit sag rate increase / decrease Button, 28 ... Standard sag rate increase / decrease button, 29 ... Support point tension calculation part, 30 ... Support point tension determination part, 31 ... Ground height calculation part, 33 ... Electric wire actual length calculation part

Claims (10)

The standard sag rate, which is an integer of the sag rate with the house side attachment point tension set to a predetermined tension value or less, corresponding to the span between the wires from the utility pole side to the house side and the wire thickness to be laid A standard sag rate storage unit stored in advance;
A tension limit sag rate storage unit storing the tension limit sag rate;
The standard sag rate corresponding to the span between the wires that are input from the input device and the thickness of the wire to be wired is selected from the standard sag rate storage unit and the tension limit sag rate from the tension limit sag rate storage unit. A sag rate calculation unit that selects a rate and displays it on a display device;
Based on the span inputted from the input device, the height of the utility pole side support point, the height of the house side support point, the standard sag rate selected by the sag rate calculation unit and the tension limit sag rate A support point tension calculation unit that calculates the side support point tension and the house side support point tension and displays the output on the display device;
Based on the span inputted from the input device, the height of the utility pole side support point, the height of the house side support point, the standard sag rate and the tension limit sag rate selected by the sag rate calculation unit A lead-in wire overhead line support device, comprising: a ground height calculation unit that calculates the ground height at an arbitrary position between spans and outputs the ground height to a display device. A support point tension threshold storage unit that stores in advance a support point tension threshold of a support point for connecting the electric wire;
It is determined whether or not the utility pole side support point tension and the house side support point tension calculated by the support point tension calculation unit are within the support point tension threshold stored in the support point tension threshold storage unit, and the determination result is displayed. The lead-in wire overhead line support device according to claim 1, further comprising a support point tension determination unit that outputs a display to the device.   Based on the height of the utility pole side support point input from the input device, the height of the house side support point, the standard sag rate and the tension limit sag rate selected by the sag rate calculation unit The lead-in wire overhead line support device according to claim 1 or 2, further comprising a wire actual length calculation unit that calculates the wire actual length and outputs the difference on a display device.   When the increase / decrease command is input from the input device to the standard sag rate and the tension limit sag rate, the sag rate calculation unit selects the increased or decreased standard sag rate and the tension limit sag rate. The lead-in wire overhead line support device according to any one of claims 1 to 3.   The ground height calculation unit calculates the ground height from the power pole side support point over the entire area between the spans of the house side support point, and displays and outputs a ground height graph of the electric wire on a display device. The lead-in wire overhead line support apparatus according to any one of claims 1 to 4. The standard sag rate, which is an integer of the sag rate with the house side attachment point tension set to a predetermined tension value or less, corresponding to the span between the wires from the utility pole side to the house side and the wire thickness to be laid Store it in the standard sag rate storage unit in advance,
The tension limit sag rate indicating the sag rate is stored in the tension limit sag rate storage unit,
Select the standard sag rate corresponding to the span between wires and the thickness of the wire to be wired from the standard sag rate storage unit and select and display the tension limit sag rate from the tension limit sag rate storage unit Output,
The utility pole side support point tension and the house side support based on the span between the wires, the height of the utility pole side support point, the height of the house side support point, the selected standard sag rate and the tension limit sag rate Calculate and display the point tension,
Arbitrary position between the spans based on the span between the spans spanning the wires, the height of the utility pole side support point, the height of the house side support point, the selected standard sag rate and the tension limit sag rate A lead-in wire overhead line support method, characterized in that the overhead wire of the lead-in wire that supports the strength of the lead-in support point is calculated by calculating and displaying the ground height of the cable. The threshold value of the support point tension of the support point for connecting the wire is stored in advance in the support point tension threshold storage unit,
It is determined whether the utility pole-side support point tension and the house-side support point tension calculated by the support point tension calculation unit are within the support point tension threshold stored in the support point tension threshold storage unit, and the determination result is determined. 7. The lead-in wire support method according to claim 6, wherein a lead-in wire overhead that satisfies the lead-in support point strength by displaying and outputting is supported.   Calculate the actual length of the wire between the spans based on the height of the utility pole side support point, the height of the house side support point, the selected standard sag rate and tension limit sag rate, and display the difference 8. The lead-in wire overhead support method according to claim 6 or 7, wherein a lead-in wire overhead that satisfies the lead-in support point strength by displaying on the apparatus is supported.   9. When the increase / decrease command is issued for the standard sag rate and the tension limit sag rate, the increased or decreased standard sag rate and the tension limit sag rate are selected. The service line support method according to claim 1.   10. The ground height is calculated over the entire area between the spans of the house side support point from the utility pole side support point, and the ground height graph of the electric wire is displayed and output. The service line support method described.

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