JP6533994B2 - Tower top raising method - Google Patents

Description

  The present invention relates to a method for raising the top of an iron tower suitable for use in raising the top of an iron tower with a change in the shielding angle of an overhead ground wire installed in a power transmission tower.

As shown in the front view of FIG. 3 (a), the transmission tower 110, which is a square hat tower with a sharp pointed hat-shaped portion made of chevron steel, has a truss structure between the four main pillars 111 and the main pillars 111. A panel of a quadrangular prism structure composed of belly members (horizontal member 112 and diagonal member 113) constituting four sides is added in the vertical direction.
In addition, upper arm arm metal 114, middle arm arm arm metal 115 and lower arm arm metal 116 are respectively attached to the top panel of transmission tower 110, the fourth panel from the top and the panel from the top to the sixth. ing.
In the following, the top panel of the transmission tower 110 to which the upper arm arm metal 114 is attached is referred to as "upper arm arm metal mounting panel".

  In addition, power transmission lines (one power line 1 attached to each end of upper phase arm metal 114, middle phase arm metal 115 and lower phase arm metal 116 via a suspension insulator, as shown in FIGS. 3 (a) and 3 (b). The overhead ground wire attachment member (4 on the top of the upper phase arm metal mounting panel) is provided as a lightning protection measure for the power line 1 attached to each end of the upper phase arm metal 114. A tower top plate is attached to the top of a panel of a quadrangular pyramid structure made of main materials (Yamagata steel materials) of a book. Hereinafter, "existing installation member 117" is attached. The overhead ground wire 2 is erected on the upper surface, and lightning strikes the overhead ground wire 2 with high probability.

Since the narrow angle theta ₂ of such existing mounting member 117 in the top is satisfy the condition defined as a predetermined narrow angle specified value = 20 ° or more, for example, as well as the height = 2m of the existing mounting member 117 When the narrow angle θ ₂ of the top of the existing mounting member 117 is set to 30 °, it is necessary to make the length of the bottom of the existing mounting member 117 smaller than the length of the horizontal member 112 on the lower side of the upper arm mounting panel. Because of this, the distance between the upper end portions of adjacent main pillars 111 of the upper arm arm metal mounting panel is smaller than the distance between the lower end portions.

However, the lightning protection measures of the transmission line differ in thought and target value depending on each age when designing the power line 1, and the improvement of the lightning resistance performance has been achieved in recent years.
Therefore, as measures to improve the lightning protection performance, the shield angle theta ₁ of ground wire 2 two are bridged at both ends of the upper phase arm-114 to the power line 1 to reduce (e.g., theta ₁ from theta ₁ = 50 ° In some cases, it is necessary to raise the top of the steel tower by performing repair work to change it to = 35 °.

In such a case, the existing mounting member 117 is cut off from the root and replaced with a new overhead ground wire mounting member (hereinafter referred to as "newly mounted mounting member 117 '") shown by a dashed dotted line in FIG. 3 (b). Although thus, the height of the new mounting member 117 'to decrease the shielding angle theta ₁ (e.g., 3.5 m) height of the existing mounting member 117 (e.g., 2m) it is necessary to be larger than When the narrow angle θ ₂ 1717 ° at the top of the new mounting member 117 ′ is smaller than the narrow angle θ ₂ 3030 ° at the top of the existing mounting member 117 and the condition that the narrow angle specified value = 20 ° or more is not satisfied There is.

So, for example narrow angle theta ₂ is narrow angle specified value of the top with height are 3.5 m = 20 ° or more and have been ground wire attachment member (hereinafter, referred to as "remodeling mounting member 118".) The In order to attach it, it is necessary to make the distance between the upper ends of the adjacent main pillars 111 of the upper-phase arm metal mounting panel approximately the same as the distance between the lower ends. renovation (hereinafter. referred to as a "shield angle change renovation") to change the shielding angle θ ₁ is carried out.

(Procedure 1) As shown in FIGS. 4 (a) and 4 (b), two power lines 1 respectively installed on both ends of the upper arm arm metal 114 and an overhead installed on the upper surface of the tower top plate of the existing mounting member 117. The ground wire 2 is transposed to the lower end portion of the main column member 111 constituting a lower panel of the upper upper arm mounting panel (hereinafter referred to as "upper upper arm lower panel").

(Procedure 2) The central portions of the four main columns 111 of the upper arm lower arm lower panel (see the cut portions indicated by the two thick lines in FIG. 4C) are cut.

(Procedure 3) As shown by a broken line in FIG. 4 (d), a portion above the cutting point of the transmission tower 110 (upper part of upper main arm 111 of upper lower arm lower panel, upper upper arm mounting) The panel, upper upper arm metal 114 and existing mounting member 117) are removed.

(Procedure 4) As shown in FIG. 5 (a), bolt holes are made in the upper end portions of the four main pillars 111 of the upper lower arm lower panel after cutting.

(Procedure 5) As shown in FIG. 5 (b), lower end portions of four new main column members 111 'are bolted to the upper end portions of the four main column members 111 of the upper arm lower arm lower panel after cutting. The upper upper arm mounting plate (the upper four new horizontal mounting members 112 'are removed from the upper horizontal mounting member of the upper upper arm mounting panel by fastening the new upper main mounting members 111') And attach the upper upper arm of adjacent new main pillars 111 'at approximately the same distance as the lower end) and the new upper arm 114', and then install the modified mounting member 118. Mount on the upper arm mounting panel.

(Procedure 6) As shown in FIG. 5 (c), the two power lines 1 transposed in the above procedure 1 are respectively installed on both ends of the new upper arm 114 'through suspension insulators, and The overhead ground wire 2 transferred in step 1 is erected on the top surface of the tower top plate of the modified mounting member 118.

  According to Patent Document 1 below, after removing two overhead ground wires from the ground wire arm and temporarily supporting them on the upper part of the first arm, the two ground wire arms are removed and each main tower body is removed. The removal process which removes the removal part from the existing iron tower by removing the constituent material which constitutes the top of the pillar from the lower component is provided (see paragraph 0073 of the gazette), raising of the transmission line tower Reinforcement methods are disclosed.

JP, 2011-214374, A JP, 2014-098258, A

  However, in the procedure of the conventional shielding angle change repair work described above, the transfer line of the two power lines 1 is required in the procedure 1, and in the procedure 6, the two power lines 1 to the new upper arm 114 ' Since erection is required, there has been a problem that the blackout time associated with the modification of the shielding angle is lengthened.

  In addition, even in the reinforcement method for raising power transmission line steel towers disclosed in Patent Document 1 described above, it is necessary to remove (retire) two ground line arms, so the power failure time associated with the shielding angle change repair work There is a problem of becoming long.

  An object of the present invention is to provide a method for raising the top of a steel tower capable of shortening the power failure time associated with the shielding angle change repair work.

The method for raising the top of the tower according to the present invention is to raise the top of the tower with the change of the shielding angle (θ ₁ ) of the overhead ground wire (2) installed on the transmission tower (110) which is a square hat tower with a pointed top. Of the power transmission tower used without transferring the two power lines (1) respectively installed at both ends of the upper phase arm metal (114) of the power transmission tower, and Four bending main pillars (11) are attached to the transmission tower so as to surround the upper phase arm metal mounting panel to which the upper phase arm metal is attached without removing or moving the existing components. An overhead ground wire attachment member for changing the shielding angle so as to surround an existing attachment member (117) which is an existing overhead ground wire attachment member attached on the upper phase arm metal attachment panel after attachment mounted on the bent main pillar of And wherein the door.
So as to surround the first step of Utsurisen the ground wire to a position that does not interfere during the mounting operation of the modified mounting member before it is asked glade wire attaching member (118), the pre-SL on Aiude gold mounting panel a second step of attaching the web members (12, 13) constituting the four sides of the truss structure between before Symbol four bending main pillar Contact and flexural machining main pillar, before Kisunde設取with member And a third step of attaching the modified attachment member on the bending main pillar and a fourth step of bridging the overhead ground wire to the modified attachment member.
The modified attachment member may have a height greater than that of the existing attachment member, and the top plate of the tower may be attached to the top of a quadrangular pyramid panel formed of four main members.
In the first step, the overhead ground line may be transposed to the tip of the arm supporting member of one of the upper arm arms.
In the second step, four bending main pillars made of angle steel are attached to the outside of the four main pillars (111) constituting the upper-phase arm metal mounting panel, respectively. The belly material may be attached between the bent main pillars.
The lower end portion of the bending main column member may be bent outward in order to make the distance between the upper end portions of the adjacent bending main column members substantially equal to the distance between the lower end portions.
In the third step, lower ends of the four main members of the modified attachment member may be attached to upper ends of the four bending main pillars, respectively.
The power transmission tower may be a top pointed hat-shaped square tower made of chevron steel.

The tower top raising method of the present invention has the following effects.
(1) Since it is not necessary to move or remove the transfer line of the power line and the existing mounting member, it is possible to shorten the power failure time associated with the shielding angle change repair work.
(2) It is possible to reduce the construction cost because there is no need to remove or move the transfer line of the power line and the existing mounting member and the amount of modification is small.
(3) Since it is not necessary to move the transfer line of the power line and the existing mounting member, the workability and the safety can be improved.

It is a figure for demonstrating the procedure of the shielding angle change repair work in the tower top raising method by one Example of this invention. It is a figure for demonstrating the procedure of the shielding angle change repair work in the tower top raising method by one Example of this invention. It is a figure for demonstrating the problem when it is necessary to raise the tower top part as a countermeasure against the improvement of lightning resistance performance. It is a figure for demonstrating the procedure of the conventional shielding angle change repair work. It is a figure for demonstrating the procedure of the conventional shielding angle change repair work.

  The above-mentioned purpose was realized by carrying out the shielding angle change repair work without removing or moving the transfer line of the power line and the existing component of the transmission tower.

Hereafter, the Example of the tower | column top part raising method of this invention is described with reference to drawings.
In the method for raising the top of the steel tower according to the present invention, the two existing power lines 1 installed at both ends of the upper arm of the power transmission tower 110 are not transferred, and the existing components of the power transmission tower 110 are removed. It is characterized in that the shielding angle change repair work is carried out without moving it.

Therefore, in the tower top raising method according to one embodiment of the present invention, the shielding angle change repair work is performed in the following procedure.
(Procedure 1) As shown in FIGS. 1 (a) and 1 (b), the overhead ground wire 2 constructed on the upper surface of the tower top plate of the existing mounting member 117 of the power transmission tower 110 is obstructed at the time of mounting the mounting member 118 The line is transposed to a position (for example, the tip of the arm lifting member on the upper left side of the upper arm arm 114 shown in the drawing).
At this time, the two power lines 1 respectively installed at both ends of the upper arm arm metal 114 via suspension insulators are left as they are without transfer.

(Procedure 2) As shown in FIG. 1 (c) where the existing components are indicated by a broken line for easy viewing of the drawing, to surround the upper arm mounting panel on which the upper arm mounting 114 is attached, Four bending main columns 11 made of Yamagata steel, and belly members (new horizontal 12 and new diagonal 13) constituting four sides of the truss structure between the bending main columns 11 Attach.
At this time, the four bending main columns 11 are attached to the outside of the four main columns 111 of the upper phase arm metal mounting panel of the power transmission tower 110 respectively, but the upper end portions of the adjacent bending main columns 11 are attached. The lower end of the bending main column 11 is bent outward in order to make the distance substantially equal to the distance of the lower end.
In addition, two bolt holes 11a (see the enlarged view surrounded by a circle of a broken line in the figure) are opened at the lower end portion of one piece of the bending main column 11 and the main column of the upper phase arm metal mounting panel Two bolt holes (not shown) are made at the lower end of one piece of the material 111, and two new bolts are used to bend the main column material 111 of the upper arm arm mounting panel into one piece of the main column material 11 Attach the lower end of one piece.
Also, open two bolt holes (not shown) in the lower end of the other piece of the bent main column 11 and open the lower end of the other piece of the main column 111 of the upper-phase arm metal mounting panel The lower end portion of the other piece of the bending main column member 11 is attached to the other piece of the main column member 111 of the upper-phase arm metal mounting panel using two new bolts using the bolt holes.
Both ends of the new horizontal member 12 and the upper ends of the two new diagonal members 13 are respectively attached to the upper ends of the two adjacent bending main columns 11, and the lower ends of the two new diagonal members 13 are And the gusset plate is attached to the connection portion of the two main arm metal members of the upper arm metal 114.

(Step 3) so as to surround the existing mounting member 117 mounted on the upper phase arm-mounting panel, mounting a modified forming attachment member 118 on the four bending main pillar 11.

(Procedure 4) As shown in FIG. 2 (a) where the existing components are indicated by a broken line for easy viewing of the drawing, the overhead ground wire 2 transposed in procedure 1 is modified to the upper surface of the tower top plate of the mounting member 118 To

  As described above, in the method for raising the top of the steel tower according to one embodiment of the present invention, the space between the existing upper joint arm mounting panel and the existing mounting member 117 surrounded by the four bending main columns 11 and the retrofit mounting The modified mounting member 118 can be mounted in the internal space of the member 118, so that the bending main column 11 and the modified mounting member 118 can be mounted without interfering with the existing components of the transmission tower 110. (FIG. 2 (b) schematically showing the positional relationship between the upper arm arm metal 114, the existing mounting member 117 and the modified mounting member 118 when cut at the new horizontal member 12 and the modified mounting member 118 mounted Refer to Fig. 2 (c) where the rear state is viewed from the lower diagonal direction, In both figures, the upper arm arm metal 114 and the existing mounting member 117 are indicated by broken lines for easy viewing of the drawing. Be.).

  In addition, the shielding angle change repair work demonstrated above can be performed using a well-known base bar construction method (for example, refer Paragraph 0006 of the above-mentioned patent document 2).

Reference Signs List 1 power line 2 overhead ground wire 11 bending main column 11a bolt hole 12 new horizontal member 13 new diagonal member 110 power transmission tower 111 main column 111 'new main column 112 horizontal member 112' new horizontal member 113 diagonal 114 upper phase Arm 114 'New upper arm 114' New upper arm 115 Middle arm 116 Lower arm 117 Existing mounting member 117 'New mounting member 118 Remodeled mounting member θ ₁ Shielding angle θ ₂ Narrow angle

Claims (8)

This is the tower top raising method used to raise the top of the tower with the change of the shielding angle (θ ₁ ) of the overhead ground wire (2) installed on the power transmission tower (110) which is a square hat tower with a pointed top. ,
The existing components of the transmission tower are removed or moved without transferring the two power lines (1) installed respectively at both ends of the upper phase arm metal (114) of the transmission tower. Without
After attaching four bending main pillars (11) to the transmission tower so as to surround the upper arm mounting panel to which the upper arm mounting is attached,
The overhead ground wire attachment member for changing the shielding angle is bent so as to surround the existing attachment member (117) which is the existing overhead ground wire attachment member attached on the upper arm arm metal attachment panel Attach on top of the main pillar material,
It is characterized by the tower top raising method. A first step of Utsurisen the ground wire to a position that does not interfere during the mounting operation of the modified mounting member before it is asked glade wire attaching member (118),
So as to surround the front SL on Aiude gold mounting panel, mounting web members constituting the four sides of the truss structure (12, 13) between the front Symbol four bending main pillar Contact and flexural machining main pillar The second step,
Before so as to surround the Kisunde設取member with a third step of attaching the modified mounting member on said bent main pillar,
A fourth step of bridging the overhead ground wire to the modified mounting member;
The tower top raising method according to claim 1, comprising:   The modified attachment member is characterized in that the height is made larger than the existing attachment member, and the top plate of the steel tower is attached to the apex of the quadrangular pyramid panel made of four main members. The tower top raising method according to claim 2.   4. The tower top raising method according to claim 2, wherein the overhead ground wire is transposed to the tip of the arm supporting member of one of the upper arm arms in the first step.   In the second step, four bending main pillars made of angle steel are attached to the outside of the four main pillars (111) constituting the upper-phase arm metal mounting panel, respectively. The method for raising a top portion of a steel tower according to any one of claims 2 to 4, characterized in that the belly material is attached between the bent main columns.   The lower end portion of the bending main column member is bent outward in order to make the distance between the upper end portions of the adjacent bending main column members substantially equal to the distance between the lower end portions. The tower top raising method according to 5.   The lower end portions of the four main members of the modified attachment member are attached to the upper end portions of the four bending main pillars, respectively, in the third step. The tower top raising method described in 4.   8. The method according to any one of claims 1 to 7, wherein the power transmission tower is a peak-shaped square-shaped steel tower made of chevron steel.

Images