JP2011214374A - Reinforcing construction method for piling steel tower for power-transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent increase of ground area to be needed and to solve shortage of strength of a steel tower for a power-transmission line from the lower part to the upper part of the tower after piling against received power by wind pressure.SOLUTION: A reinforcing construction method for piling steel tower for power-transmission line includes: a column building step in which a plurality of column components are connected in the vertical direction so that a first reinforcement column 22 and a second reinforcement column 23 arranged in a direction crossing the direction of extending power-transmission line 102 are built in a quadrangle area formed by adjoining main columns 12 which are connected; a connection step between reinforcement columns in which both the reinforcement columns 22, 23 are connected to a plurality of parts in a height direction; a connection step between the first reinforcement column and the main column in which two main columns 12 disposed near the first reinforcement column 22 and that column 22 are connected to a plurality of parts in a height direction by a second connecting member 28; and a connection step between the second reinforcement column and the main column in which two main columns 12 disposed near the second reinforcement column 23 and that column 23 are connected to a plurality of parts in a height direction by a third connecting member 30.

Description

  The present invention relates to a reinforcing method for raising a power transmission tower.

  2. Description of the Related Art Conventionally, a transmission line tower for connecting a transmission line is known. In this transmission line tower, there is a shortage of separation distance between the transmission line and the trees or buildings due to factors such as the growth of trees around the installation site and the planned construction of high-rise buildings around them. May occur. For this reason, raising the height position where a transmission line is installed by raising the existing transmission line tower. However, when the existing steel tower is raised, it becomes necessary to perform some reinforcement to prevent the steel tower from falling over. Patent Document 1 below discloses an example of a reinforcing structure for preventing such a raised steel tower from collapsing. Specifically, in this Patent Document 1, new reinforcement foundations are provided on both outer grounds of an existing steel tower, and reinforcement legs are installed so as to extend obliquely upward from the respective reinforcement foundations to the steel tower side. . The tip of the reinforcing leg is connected to a portion of the steel tower at a predetermined height position, thereby preventing the tower that has been raised from falling down.

Japanese Patent Laid-Open No. 2004-300872

  However, the technique disclosed in Patent Document 1 has a problem in that the required land area increases because a new reinforcing foundation is provided outside the existing steel tower. Moreover, with the technique of the said patent document 1, it is difficult to compensate for the strength shortage with respect to the wind pressure of the steel tower which arises with raising. That is, the power transmission line tower receives a horizontal force due to the wind pressure received by the steel tower itself and the power transmission line supported by the steel tower, and therefore requires a strength that can sufficiently withstand the force. And since the raised steel tower requires a strength greater than that required by the existing steel tower with respect to the horizontal force, it is required to compensate for the lack of strength. However, in the reinforcement structure that supports the portion in the vicinity of the foundation of the tower with the auxiliary legs extending obliquely from the foundation outside the tower as in the above-mentioned Patent Document 1, it can be reinforced only in a very small region near the lower end of the tower, It is difficult to eliminate the insufficient strength of the steel tower after raising the height against the horizontal force up to the top of the steel tower.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to prevent the transmission line tower from being insufficiently strong against the force received by wind pressure while preventing an increase in the required land area. It is to eliminate from the lower part to the upper part.

  In order to achieve the above object, the reinforcement method for raising a transmission line tower according to the present invention is erected at a position corresponding to each vertex of a quadrilateral at an installation place, and adjacent ones are connected to each other. A transmission line tower for reinforcing the transmission line tower as the existing transmission line tower is raised with a main pillar and supporting the transmission line so as to extend in a direction substantially parallel to one side of the square. A reinforcing method for raising the height of the power transmission line by connecting a plurality of strut members having a predetermined length in a vertical direction in a quadrangular region formed by connecting adjacent main pillars. A column erecting step of erecting a first reinforcing column and a second reinforcing column arranged in a direction crossing the direction, and a first connection of the first reinforcing column and the second reinforcing column at a plurality of locations in the height direction Depending on the material A plurality of first pillars and a plurality of first pillars that are positioned on one side in the direction in which the first reinforcement pillar and the second reinforcement pillar are aligned, respectively, in the height direction. A second connecting step in which the second connecting members are connected to each other at the point, and the two main pillars and the second reinforcing pillars located on the other side in the direction in which the first reinforcing pillars and the second reinforcing pillars are arranged. And a third connecting step for connecting the two at a plurality of locations in the height direction with a third connecting material.

  In this reinforcing method for raising the transmission line tower, the first reinforcement pillar and the second reinforcement pillar are connected in the quadrangular region formed by connecting the adjacent main pillars of the transmission line tower in the pillar standing step. Therefore, the required land area will not increase. Further, in this reinforcing method, the first reinforcing column and the second reinforcing column are erected in a quadrangular region formed by connecting adjacent main columns, and both the reinforcing columns and each reinforcing column are Since the main pillar located on the outside of the tower is connected at multiple points in the height direction, the height of the tower is different from that in which reinforcement is performed by supporting the part near the foundation of the tower with reinforcement legs diagonally extending from both outsides. It is difficult to be restricted by the reinforcing region in the direction, and the strength can be increased by reinforcing from the inside of the steel tower, for example, up to the top of the steel tower after being raised. In addition, in this reinforcing method, the first reinforcing column and the second reinforcing column are erected so as to be aligned in a direction intersecting with the direction in which the transmission line extends. Can be increased. As a result, with this reinforcing method, it is possible to eliminate the lack of strength of the transmission line tower from the lower part to the upper part of the tower after raising the floor against the force received by the wind pressure. Therefore, in this reinforcement construction method, it is possible to eliminate the lack of strength of the transmission line tower after raising the height against the force received by the wind pressure from the lower part to the upper part of the tower while preventing the required land area from increasing.

  In the reinforcing method for raising the transmission line tower, the second connecting step is performed in the middle of connecting the plurality of strut constituent members constituting the first reinforcing strut upward in the strut standing step. Including a step of connecting a strut constituent member connected on a lower strut constituent member to the two main pillars located on the one side by the second connecting member, and the third connecting step includes the step of In the column erecting step, the column component member that is connected to the lower column component member is connected to the third connecting member, while the plurality of column component members constituting the second reinforcing column are connected upward. It is preferable to include a step of connecting to the two main pillars located on the other side.

  According to this structure, in order to form a 1st reinforcement support | pillar and a 2nd reinforcement support | pillar, a plurality of support | pillar structure members are connected upward, and the connected support | pillar structure member can be connected and supported with a main pillar by a connection material. Therefore, it is possible to form a long reinforcing column while supporting the reinforcing column so as not to fall within the area surrounded by the main columns.

  In the reinforcement method for raising the transmission line tower, the first connection step includes the first reinforcement by the first connection member extending in the horizontal direction between the first reinforcement column and the second reinforcement column. A horizontal connecting step of connecting the strut and the second reinforcing strut to each other may be included.

  According to this structure, the intensity | strength of the steel tower with respect to the stress to the horizontal direction resulting from a wind pressure can be raised effectively.

  In this case, in addition to the horizontal connection step, the first connection step includes a plurality of the intersections extending obliquely with respect to the height direction between the first reinforcement column and the second reinforcement column and intersecting each other. It is preferable to include an oblique connection step of connecting the first reinforcing column and the second reinforcing column to each other by the first connecting member.

  According to this configuration, a truss structure can be formed between both reinforcing columns, and the strength of the steel tower can be further increased.

  In the reinforcing method for raising the transmission line tower, it is preferable to include a fourth connecting step of connecting the first connecting members and the main pillars with the fourth connecting members.

  According to this configuration, in addition to the reinforcement struts being connected to the corresponding main pillars via the second connection member or the third connection member, the reinforcement struts are connected to the first connection member and the fourth connection member. It is connected to each main pillar via. For this reason, the structure comprised by connection with each reinforcement support | pillar and a main pillar becomes stronger, As a result, the intensity | strength of the steel tower after raising can be raised more.

  In the reinforcing method for raising the transmission line tower, a plurality of transmission lines are spanned at an interval in the height direction on the transmission line tower, and in the column erecting step, the first reinforcement column It is preferable that the second reinforcing column is erected so as to extend to a position higher than a position located at the lowest position among the portions where the plurality of power transmission lines are laid in the tower for transmission lines after raising.

  If comprised in this way, the said reinforcement support | pillar will be extended to the position higher than the position of the power transmission line located in the lowest position among each transmission line which receives wind pressure in the steel tower after raising, and a steel tower will be supported by the both reinforcement support | pillars be able to. For this reason, as compared with the case where the reinforcing column extends only to a position lower than the part where the transmission line is built in the raised tower, the strength of the raised tower against the wind pressure received by the transmission line is more effectively secured. Can do.

  In the reinforcing method for raising the power transmission line tower, in the second connection step, the second reinforcing column out of the second reinforcing columns out of the main columns erected at positions corresponding to the vertices of the squares. The two main pillars close to one reinforcing column and the first reinforcing column are connected by the second connecting member, and in the third connecting step, each of the above-mentioned standing columns is provided at a position corresponding to each vertex of the quadrangle. It is preferable that two main pillars closer to the second reinforcing pillar than the first reinforcing pillar among the main pillars are connected to the second reinforcing pillar by the third connecting member.

  If comprised in this way, since the main pillar close | similar to each reinforcement support | pillar can be connected with a connection material with small length, it becomes possible to raise effectively the connection strength of a reinforcement support | pillar and a main pillar. For this reason, the intensity | strength of the whole steel tower after raising including a reinforcement support | pillar can be improved favorably.

  In this case, the reinforcing method includes two main columns closer to the second reinforcing column than the first reinforcing column among the main columns erected at a position corresponding to each vertex of the quadrangle. A fifth connecting step of connecting the first reinforcing column with a fifth connecting member, and the first reinforcing member out of the second reinforcing column among the main columns erected at positions corresponding to the apexes of the quadrangle. It is preferable to include a sixth coupling step of coupling two main pillars close to the column and the second reinforcing column with a sixth coupling member.

  According to this configuration, each reinforcing column can be connected to the two distant main columns, and the strength of connection between the reinforcing column and the main column can be further increased. As a result, it is possible to further increase the strength of the entire steel tower including the reinforcing column after raising.

  Furthermore, in this case, after raising the transmission line tower, after removing the removal part, which is a part extending over a predetermined length from the upper end of the existing transmission line tower, after removing the removal part A new part having a height higher than that of the removal part is connected to the upper end of the transmission line tower, and in the column erecting step, at least the height position of the lower end of the removal part of the existing transmission line tower Both the reinforcing struts are erected so that the first reinforcing strut and the second reinforcing strut extend until the first reinforcing strut and the first reinforcing strut at the height position of the lower end of the removal site in the first connecting step. The second reinforcing struts are connected to each other by the first connecting member. In the second connecting step, the two reinforcing struts are closer to the first reinforcing struts than the second reinforcing struts at the height position of the lower end of the removal site. The main pillar and front The first reinforcing column is connected to the first reinforcing column by the second connecting member, and in the fifth connecting step, two lower reinforcing columns are closer to the second reinforcing column than the first reinforcing column at the height position of the lower end of the removal site. The main pillar and the first reinforcing column are connected by the fifth connecting member, and in the third connecting step, the second reinforcing column is more than the first reinforcing column in the height position of the lower end of the removal site. The two main pillars close to each other and the second reinforcing column are connected by the third connecting member, and in the sixth connecting step, the second reinforcing column is higher than the second reinforcing column at the height position of the lower end of the removal site. It is preferable that two main pillars close to one reinforcing column and the second reinforcing column are connected by the sixth connecting member.

  According to this configuration, after removing the removal site, instead of connecting the newly installed site and the existing site of the steel tower, the corresponding reinforcement struts and the main columns or both reinforcement support columns are connected by the connecting members. Can be linked. Thereby, the structure which becomes favorable in the transmission of the stress from a newly installed site | part to each reinforcement support | pillar in the connection site | part can be comprised. Accordingly, it is possible to favorably support the weight of the newly installed site, the wind pressure received by the newly installed site and the power transmission line supported by the newly installed site, and the like with each main column and each reinforcing column.

  In the configuration including the fifth connection step and the sixth connection step, in the first connection step, in the height position where the overhead wire portion, which is the portion where the transmission line is built, is provided in the transmission line tower. The first reinforcing column and the second reinforcing column are connected to each other by the first connecting member, and in the second connecting step, the first reinforcing column and the second reinforcing column are higher than the second reinforcing column at the height position where the overhead wire portion is provided. Two main pillars close to one reinforcing column and the first reinforcing column are connected by the second connecting member, and in the fifth connecting step, the first reinforcing member is provided at a height position where the overhead wire portion is provided. Two main columns closer to the second reinforcing column than the column are connected to the first reinforcing column by the fifth connecting member, and in the third connecting step, at the height position where the overhead wire portion is provided. From the first reinforcing column The two main pillars close to the second reinforcing column and the second reinforcing column are connected by the third connecting member, and in the sixth connecting step, at the height position where the overhead line portion is provided, It is preferable that the two main pillars closer to the first reinforcement pillar than the two reinforcement pillars are connected to the second reinforcement pillar by the sixth connecting member.

  In the power transmission tower, the stress due to the wind pressure received by the power transmission line is applied at the location where the overhead wire portion is provided. Therefore, according to this configuration, the corresponding reinforcing strut and the main pillar or both reinforcing struts can be connected to each other by the connecting members at the height position where the overhead wire portion is provided. The stress resulting from the wind pressure can be satisfactorily transmitted from the overhead line portion to each reinforcing column. As a result, it is possible to satisfactorily support the stress caused by the wind pressure received by the transmission line.

  As described above, according to the present invention, while preventing an increase in the required land area, the lack of strength of the transmission line tower after the increase in the force received by wind pressure is resolved from the lower part to the upper part of the tower. be able to.

It is the schematic which looked at the existing steel tower for power transmission lines in the direction where a power transmission line extends. It is a top view which shows the structure of the foundation of the existing steel tower for power transmission lines shown in FIG. It is the figure which looked at the state embed | buried in the ground of the foundation shown in FIG. 2 in the direction where a power transmission line is extended. It is a top view corresponding to the said FIG. 2 of the foundation of the tower for power transmission lines after reinforcing for raising. It is a figure which shows the state corresponding to the said FIG. 3 of the foundation shown in FIG. It is a horizontal sectional view which shows the structure of the lowest node of the steel tower for power transmission lines after performing the reinforcement for raising. It is a horizontal sectional view which shows the structure of the node of the bend point of the steel tower for power transmission lines after reinforcing for raising. It is a horizontal sectional view which shows the structure of the node of the position of the lower side of the 1st arm of the steel tower for power transmission lines after performing the reinforcement for raising. It is a figure for demonstrating the process of the reinforcement construction method for raising the tower for power transmission lines by one Embodiment of this invention. It is a figure for demonstrating the process of the reinforcement construction method for raising the tower for power transmission lines by one Embodiment of this invention. It is a horizontal sectional view which shows the connection structure between each main pillar in the connection part of the newly installed site | part with respect to the existing steel tower, between each main pillar, and each reinforcement support | pillar, and between reinforcement support | pillars. It is a figure for demonstrating the process of the reinforcement construction method for raising the tower for power transmission lines by one Embodiment of this invention. It is a figure for demonstrating the process of the reinforcement construction method for raising the tower for power transmission lines by one Embodiment of this invention. It is a figure for demonstrating the process of the reinforcement construction method for raising the tower for power transmission lines by one Embodiment of this invention. It is the schematic which looked at the tower for power transmission lines after raising and reinforcing in the direction where a power transmission line extends. It is a horizontal sectional view showing the structure of the node provided with the transmission line arm of the transmission line tower after reinforcing for raising in the reinforcement method according to the modification of the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the structure of an existing transmission line tower to which a reinforcing method for raising the transmission line tower according to an embodiment of the present invention is applied will be described with reference to FIGS.

  This existing power transmission tower (hereinafter referred to as an existing steel tower) is composed of two transmission lines 102, one set of three phases, ie, a total of six phases of transmission lines 102, and a transmission line that induces lightning strikes. Two aerial ground wires 104 having functions such as preventing direct lightning strikes 102 are supported in the air. Note that each phase of the power transmission line 102 may include only one electric wire or may include a plurality of electric wires. The existing steel tower includes a steel tower body 2, a ground arm 4, a first power transmission line arm 6, a second power transmission line arm 8, and a third power transmission line arm 10.

  The steel tower body 2 is erected at a predetermined installation location. The tower main body 2 includes four main pillars 12 and a large number of main pillar connecting members 14.

  The four main pillars 12 are erected at positions corresponding to the apexes of the square at the installation location of the existing steel tower.

  Specifically, each main pillar 12 is erected on a foundation 16 (see FIG. 2) embedded in a position corresponding to each vertex of a square at the installation location. Each foundation 16 has a base portion 16a formed in a square shape, and a support portion 16b extending upward from the center position of the base portion 16a. The support portion 16b of each foundation 16 is inclined so as to gradually approach the other foundation 16 side located diagonally as it goes upward from the base portion 16a. Each foundation 16 is installed in a hole formed by excavating a portion indicated by a region A in FIGS. 2 and 3 on the ground of the installation location, and is embedded by refilling the hole. . At this time, as shown in FIG. 3, each foundation 16 is embedded so that the upper end portion of the support portion 16 b of each foundation 16 protrudes from the ground.

  Each main pillar 12 is formed by joining a plurality of constituent members 12a having a predetermined length in the longitudinal direction. Specifically, the end portions of the constituent material 12a are joined to each other at the site indicated by the symbol J in FIG. 1 and each site having the same shape as the site. Each component 12a consists of a cylindrical steel pipe. Each constituent member 12a may be made of a concrete-filled steel pipe filled with concrete. And each main pillar 12 inclines so that it may approach the other main pillar 12 side located diagonally as it goes upwards. The inclination angle of each main pillar 12 changes at a point (bend point) at a predetermined height from the ground. That is, the inclination angle of the upper part from the bend point is smaller than the inclination angle of the part from the ground to the bend point in each main pillar 12. Thereby, each main pillar 12 is slightly bent at the bend point.

  Two adjacent main pillars 12 among the four main pillars 12 are connected to each other by a large number of main pillar connecting members 14. This main pillar connecting material 14 constitutes a truss structure that connects adjacent main pillars 12 to each other. That is, the four side surfaces of the steel tower body 2 have truss structures. Furthermore, each part shown by the horizontal line in the tower main body 2 in FIG. 1 is a node of the tower main body 2, and in each node, adjacent main pillars 12 are connected by a connecting material extending in the horizontal direction, The connecting materials may be further connected.

  For example, at the node 18a located at the bottom of the nodes of the tower main body 2 (hereinafter referred to as the lowest node 18a), as shown in FIG. 6, the adjacent main pillars 12 connect them linearly. It is connected by a main pillar horizontal connecting member 19 that extends and extends horizontally. Specifically, two ribs 12d protrude from the outer surface of each main pillar 12, and each rib 12d is disposed so as to protrude toward the adjacent main pillar 12 side. Adjacent main pillars 12 are connected to each other by the main pillar horizontal connecting members 19 by joining the end portions of the main pillar horizontal connecting members 19 to the ribs 12d.

  Further, a mounting portion 19 a is provided at an intermediate portion in the longitudinal direction of each main pillar horizontal connecting member 19 so as to protrude toward the inside of a square formed by the four main pillars 12. And the attaching parts 19a of the adjacent main pillar horizontal connecting members 19 are connected to each other by the first connecting bars 21a extending obliquely with respect to the adjacent main pillar horizontal connecting members 19 in the horizontal plane. Further, the adjacent first connecting bars 21a are connected by a second connecting bar 21b extending in parallel with the corresponding main column horizontal connecting member 19 in the horizontal plane. And the attaching part 19a of the two main pillar horizontal connection members 19 arranged separately in the extending direction of the power transmission line 102 and the corresponding second connection bar 21b with respect to the second connection bar 21b in the horizontal plane They are connected by a third connecting bar 21c extending vertically.

  Moreover, in the node 18b located at the bend point of the tower main body 2, the adjacent main pillars 12 are connected to each other by the main pillar horizontal connecting member 19, and the adjacent main pillar horizontal connecting members 19 are connected to the first connecting bar 21a. Are connected by Specifically, at the node 18b of the bend point, a bracket 12b is externally fitted and fixed to each main pillar 12, and a corresponding end portion of the main pillar horizontal coupling member 19 is coupled to the bracket 12b. Thus, the adjacent main pillars 12 are connected in the horizontal direction. The arrangement of the main column horizontal connecting members 19 is the same as the arrangement of the main column horizontal connecting members 19 in the lowermost node 18a. Further, each main pillar horizontal connecting member 19 is provided with a mounting portion 19a similarly to the lowermost node 18a, and the mounting portions 19a of the adjacent main pillar horizontal connecting members 19 are connected by the first connecting bar 21a. Has been. The arrangement of the first connecting bars 21a is the same as the arrangement of the first connecting bars 21a in the lowermost node 18a.

  Further, in the node 18 c at a height position corresponding to the lower side of the first power transmission line arm 6 in the tower main body 2, the adjacent main pillars 12 are connected by the main pillar horizontal connecting member 19. Specifically, in a node 18c corresponding to the lower side of the first power transmission line arm 6, brackets 12b are externally fitted and fixed to the main pillars 12, and the brackets 12b fixed to adjacent main pillars 12 are fixed to each other. Are connected by a main pillar horizontal connecting member 19. The configuration of the main column horizontal coupling member 19 at the node 18c corresponding to the lower side of the first transmission line arm 6 is the same as the configuration of the corresponding portion of the node 18b at the bend point.

  As shown in FIG. 1, the ground arm 4 is attached to the uppermost part of the tower main body 2, and the aerial ground wires 104 arranged on both sides of the uppermost part of the tower main body 2 are connected to the adjacent main pillars 12. Is supported so as to extend in a direction substantially parallel to one side of a square formed by connecting the two. The ground arm 4 includes a side surface facing the overhead ground wire 104 on one side of the uppermost part of the tower body 2 and a side surface facing the overhead ground wire 104 on the other side of the uppermost part of the tower body 2. It is provided to overhang. That is, a pair of ground wire arms 4 protrudes from the uppermost part of the tower main body 2 to both sides. The local arm 4 supports the corresponding overhead ground wire 104 at its tip.

  The first power transmission line arm 6 (hereinafter referred to as the first arm 6) is configured such that the power transmission line 102a (hereinafter referred to as the upper power transmission line 102a) positioned at the highest position among the power transmission lines 102 is connected to the adjacent main pillars 12. It supports so that it may extend in the direction (same direction as the said imaginary ground wire 104) substantially parallel to one side of the square formed by connecting. The upper power transmission line 102 a is disposed on both sides of the tower main body 2 at positions spaced below the overhead ground line 104. The first arm 6 faces the upper power transmission line 102a on one side of the tower main body 2 and faces the upper power transmission line 102a on the other side of the tower main body 2 at a position spaced downward from the ground arm 4. It is provided so that it may overhang from each side. That is, the pair of first arms 6 protrudes from the tower main body 2 on the same side as the ground arm 4 at a position spaced downward from the ground arm 4. Each first arm 6 supports the corresponding upper power transmission line 102a at its tip.

  The second power transmission line arm 8 (hereinafter referred to as the second arm 8) is configured such that the power transmission line 102b (hereinafter referred to as the middle power transmission line 102b) located at the second highest position among the power transmission lines 102 is referred to as the upper power transmission line 102a. It is supported so as to extend in the same direction. The middle power transmission line 102b is disposed on both sides of the tower main body 2 at positions spaced below the upper power transmission line 102a. The configuration of the second arm 8 is the same as the configuration of the first arm 6. That is, the pair of second arms 8 protrudes from the tower body 2 to the same both sides as the first arm 6 at a position spaced downward from the first arm 6, and each second arm 8 has a corresponding middle at the tip. The power transmission line 102b is supported.

  The third power transmission line arm 10 (hereinafter referred to as the third arm 10) has a power transmission line 102c (hereinafter referred to as the lower power transmission line 102c) located at the lowest position among the power transmission lines 102 in the same direction as the middle power transmission line 102b. It supports so that it may extend. The lower power transmission line 102c is disposed on each side of the tower main body 2 at a position spaced below the middle power transmission line 102b. The configuration of the third arm 10 is the same as the configuration of the second arm 8. That is, the pair of third arms 10 protrudes from the tower body 2 to the same both sides as the second arm 8 at a position spaced downward from the second arm 8, and each third arm 10 has a corresponding lower end at the tip. The power transmission line 102c is supported.

  Next, the process of the reinforcement construction method for raising the transmission line tower according to one embodiment of the present invention will be described.

  In the reinforcement method of the present embodiment, first, foundation work for installing the reinforcement foundation 24 is performed. In this foundation work, as shown in FIG. 4, the reinforcement foundation 24 is installed between the adjacent foundations 16 of an existing steel tower.

  Specifically, the reinforcement foundation 24 is installed between the foundations 16 adjacent in a direction substantially parallel to the direction in which the power transmission line 102 extends. At the time of installing the reinforcing foundation 24, the reinforcing foundation 24 is installed in a hole formed by excavating the area indicated by the symbol B in FIGS. 4 and 5 in the ground of the installation location, and then the hole is backfilled. The reinforcing foundation 24 is embedded. The reinforcing foundation 24 is formed in a rectangular shape extending in a direction substantially orthogonal to the direction in which the power transmission line 102 extends. And when excavating the said area | region B, and the force which presses down the foundation 16 of the existing steel tower by the ground is insufficient, as shown in FIG. 4, the sandbag 17 is put on the area | region where each foundation 16 was embed | buried. May be installed.

  Next, a column erecting step for erecting the first reinforcement column 22 and the second reinforcement column 23 on the reinforcement foundation 24 is performed. In this column erection step, the transmission line 102 is formed by connecting a plurality of column members having a predetermined length in the vertical direction in a substantially square region formed by connecting adjacent main columns 12 of the existing tower. The first reinforcing column 22 and the second reinforcing column 23 are erected in a direction substantially orthogonal to the extending direction of the first column.

  In the column erection process, the reinforcement columns 22 and 23 are erected while the power transmission lines 102 are energized. When the width of the steel tower is small, the reinforcing columns 22 and 23 may be erected after stopping energization of the power transmission line 102 on at least one of the left and right lines.

  Specifically, in this strut-standing configuration, the two main pillars 12 located on one side (left line side) in the substantially square area and in a direction substantially orthogonal to the direction in which the power transmission line 102 extends. At a position P1 (see FIG. 4) adjacent to the side connecting the two, the lower part of the strut constituent member constituting the first reinforcing strut 22 is embedded in the reinforcing base 24, and the upper part of the strut constituent member is from the upper surface of the reinforcing base 24. The said support | pillar structural member is installed so that it may protrude upwards. Further, a position P2 (adjacent to the side connecting the two main pillars 12 positioned on the other side (right line side) in the substantially square area and in the direction substantially orthogonal to the direction in which the power transmission line 102 extends) In FIG. 4), the strut constituting member constituting the second reinforcing strut 23 is installed on the reinforcing foundation 24 in the same manner as the strut constituting member of the first reinforcing strut 22. Note that all the strut constituent members of the first reinforcing struts 22 and all the strut constituent members of the second reinforcing struts 23 are made of concrete-filled steel pipes. This concrete-filled steel pipe is obtained by filling concrete into a cylindrical steel pipe. And the same support | pillar structure member is connected to the upper end of the two support | pillar structure members installed in the reinforcement foundation 24, respectively, and the 1st reinforcement support | pillar 22 and 1st are connected by connecting a several support | pillar structure member similarly after that. 2 Reinforcing struts 23 are formed. In addition, the below-mentioned bracket 27a is previously fitted and fixed to the upper end of the column constituting member constituting the upper ends of both reinforcing columns 22 and 23, and the column constituting member with the bracket 27a is fixed to the both reinforcing columns. Arranged at the top of 22 and 23.

  Moreover, both the reinforcement support | pillars 22 and 23 are the position of the lower end of the removal site | part mentioned later among the tower main bodies 2, ie, the height of the junction part of the uppermost component material 12a of the main pillar 12, and the component material 12a of the lower side. It is formed so as to extend to the vertical position (see FIG. 9). The height positions of the upper ends of the two reinforcing struts are higher than the first arm 6 and higher than the second arm 8a that is second from the bottom in the raised steel tower described later. Further, the first reinforcing column 22 is formed so that the first reinforcing column 22 extends at substantially the same inclination angle as the surface formed by connecting the two main columns 12 closer to the first reinforcing column 22. At the same time, the second reinforcing column 23 is formed so that the second reinforcing column 23 extends at substantially the same inclination angle as the surface formed by connecting the two main columns 12 closer to the second reinforcing column 23. . That is, the inclination angle of the portion of the reinforcing struts 22 and 23 above the bend point is smaller than the inclination angle of the portion of the reinforcing struts 22 and 23 from the ground to the height of the bend point. Both reinforcing columns 22 and 23 are formed.

  And in this embodiment, during the said support | pillar standing-up process, the connection process between reinforcement struts, a 1st reinforcement support | pillar-main pillar connection process, a 2nd reinforcement support | pillar-main pillar connection process, a connection material-main The column connecting process is performed.

  In the reinforcing strut connecting step, the first reinforcing strut 22 and the second reinforcing strut 23 are connected by the first connecting member 25 at a plurality of locations in the height direction. This reinforcing strut connecting step is included in the concept of the first connecting step of the present invention. The first connecting member 25 includes a first diagonal connecting member 26 and a first horizontal connecting member 27. In the connecting step between the reinforcing struts, the first reinforcing connecting member 22 and the second reinforcing struts are connected by the first oblique connecting member 26. It consists of the diagonal connection process between the reinforcement struts which mutually connects the support pillars 23, and the horizontal connection process between the reinforcement struts which connects the first reinforcement support pillars 22 and the second reinforcement support pillars 23 with each other by the first horizontal connection member 27. The diagonal connection process between reinforcement columns is included in the concept of the diagonal connection process of the present invention, and the horizontal connection process between reinforcement columns is included in the concept of the horizontal connection process of the present invention.

  In the diagonal connecting step between the reinforcing columns, as shown in FIG. 9, a plurality of first diagonal connecting members that extend obliquely with respect to the height direction between the first reinforcing column 22 and the second reinforcing column 23 and intersect each other. The first reinforcing column 22 and the second reinforcing column 23 are connected to each other by 26. In FIGS. 9, 10, and 12 to 15, the first oblique coupling member 26 is indicated by a broken line in order to make the first oblique coupling member 26 easy to understand. And, as a specific procedure in the step of diagonally connecting the reinforcing struts, after standing the two strut constituent members constituting the lowermost part of the both reinforcing struts 22 and 23 on the reinforcing foundation 24 in the strut standing step, The two support | pillar structural members are connected by the two 1st diagonal connection materials 26 which mutually cross | intersect between them. Furthermore, every time another strut component is connected to the lower strut component on the lower side of the reinforcing struts 22 and 23 in the strut erection step, the two diagonal strut members that intersect with each other are crossed with each other. They are connected by a connecting material 26. In this way, a truss structure is formed between the first reinforcing column 22 and the second reinforcing column 23 by the large number of first oblique connecting members 26. As the 1st diagonal connection material 26, what welded the plate for attachment to the reinforcement support | pillars 22 and 23 to the both ends of the pipe (cylindrical pipe) extended linearly, respectively is used. And the plate for attachment is welded to the position which faces the inner side of the left-right direction of a steel tower among the outer surface of each support | pillar structure member of the reinforcement support | pillars 22 and 23, and the plate of the support | pillar structure member and 1st diagonal The end portion of the first diagonal connecting member 26 is fixed to the reinforcing columns 22 and 23 by fastening the end plate of the connecting member 26 with bolts and nuts. In addition, also in each following connection process, the coupling | bonding of members is performed by the same fastening.

  In the horizontal connecting step between the reinforcing columns, the first reinforcing column 22 and the first reinforcing column 22 are extended by the first horizontal connecting member 27 extending in the horizontal direction between the first reinforcing column 22 and the second reinforcing column 23 during the column setting step. The 2nd reinforcement support | pillar 23 is mutually connected. Specifically, in the horizontal connecting step between the reinforcing struts, the lowest joint 18a (see FIG. 6), the bend point joint 18b (see FIG. 7), and the joint 18c (see FIG. 8), the reinforcing struts 22 and 23 are connected to each other by the first horizontal connecting member 27.

  In the lowermost node 18a, the first horizontal connecting member 27 has a pair of brackets 27a and a first reinforcing connecting member 27b made of an angle member or the like. In the lowermost node 18a, brackets 27a are externally fitted and fixed to both the reinforcing struts 22 and 23, and the first reinforcing connecting members 27b extending horizontally in a direction substantially orthogonal to the power transmission line 102 between the brackets 27a. The two reinforcing struts 22 and 23 are connected to each other by connecting with each other.

  Also at the node 18b of the bend point, the first horizontal connecting member 27 has a pair of brackets 27a and a first reinforcing connecting member 27b made of an angle member or the like. At the bend point node 18b, as in the case of the lowermost node 18a, brackets 27a are externally fitted and fixed to the reinforcing struts 22 and 23, respectively, and the brackets 27a are substantially orthogonal to the power transmission line 102. The two reinforcing struts 22 and 23 are connected to each other by being connected by the first reinforcing connecting member 27b extending horizontally in the direction in which they are to be connected.

  In the node 18c at the lower side of the first arm 6, the first horizontal connecting member 27 is a first reinforcing connecting member 27b made of an angle member or the like. And in the said node 18c, both reinforcement is carried out by fastening the corresponding edge part of the 1st reinforcement connection material 27b with respect to rib 22a, 23a protrudingly provided in the mutually opposing site | part of the outer surface of each reinforcement support | pillar 22,23. The support columns 22 and 23 are connected to each other. In the node 18c, the first reinforcing connecting member 27b is arranged to extend in parallel with the first reinforcing connecting member 27b in the node 18b at the bend point.

  In the first reinforcing column-main column connecting step, the first reinforcing column 22 among the two main columns 12 positioned on the left line side with the first reinforcing column 22, that is, the first reinforcing column 12 during the column erecting step. The two main pillars 12 closer to 22 are connected by a second connecting member 28 at a plurality of locations in the height direction. In addition, this 1st reinforcement support | pillar-main-pillar connection process is included in the concept of the 2nd connection process of this invention.

  Specifically, in the first reinforcing strut-main pillar connecting step, on the way of connecting the plurality of strut constituent members upward in the standing step of the first reinforcing strut 22, on the lower strut constituent member. The connected strut constituent members are connected to the two main pillars 12 on the left line side by the second connecting member 28.

  In the first reinforcing column-main column connecting step, the first reinforcing column 22 and the left line side are connected by the second connecting member 28 at the node 18b at the bend point and the node 18c at the lower side of the first arm 6, respectively. The two main pillars 12 located in the are connected.

  In the node 18b at the bend point, the second connecting member 28 includes a bracket 27a that is externally fitted and fixed to the first reinforcing column 22, a bracket 12b that is externally fitted and fixed to the main column 12, and an angle member. It is comprised by the 2nd reinforcement connection material 28a. At the bend point node 18b, the bracket 27a fixed to the first reinforcing column 22 and the bracket 12b fixed to one main column 12 of the two main columns 12 are arranged in the horizontal plane. The first reinforcing column 22 and the one main pillar 12 are connected by a second reinforcing connecting member 28a extending in a direction linearly connecting. In addition, the bracket 27a fixed to the first reinforcing column 22 and the bracket 12b fixed to the other main column 12 are linearly connected to the first reinforcing column 22 and the other main column 12 in the horizontal plane. It connects by the 2nd reinforcement connection material 28a extended in this.

  In the node 18c at the lower side of the first arm 6, the second connecting member 28 is constituted by a bracket 12b that is externally fitted and fixed to the main pillar 12, and a second reinforcing connecting member 28a made of an angle member. The In the node 18c, ribs 22b project from the outer surface of the first reinforcing column 22 toward the adjacent two main columns 12 and are fixed to the main columns 12 corresponding to the ribs 22b. The bracket 12b is connected by the second reinforcing connecting member 28a. At this time, the second reinforcing connecting member 28a is disposed so as to extend in parallel with the second reinforcing connecting member 28a at the node 18b at the bend point.

  Further, in the second reinforcing column-main column connecting step, the second reinforcing column 23 and the two main columns 12 positioned on the right line side, that is, the second of the main columns 12 during the column erecting step. The two main pillars 12 closer to the reinforcing column 23 are connected to each other by a third connecting member 30 at a plurality of locations in the height direction. In addition, this 2nd reinforcement strut-main pillar connection process is included in the concept of the 3rd connection process of this invention.

  Specifically, in the second reinforcing strut-main pillar connecting step, a plurality of strut constituent members are connected upward in the standing step of the second reinforcing strut 23 as in the first reinforcing strut-main pillar connecting step. On the way, the strut component connected on the lower strut component is connected to the two main pillars 12 on the right line side by the third connecting member 30.

  In the second reinforcing column-main column connecting step, the second reinforcing column 23 and the right line side are connected by the third connecting member 30 at the node 18b at the bend point and the node 18c at the lower side of the first arm 6, respectively. The two main pillars 12 located in the are connected. The connection method and the connection structure between the second reinforcing column 23 and the main column 12 in the second reinforcing column-main column connecting step are the first reinforcing column 22 and the main column in the first reinforcing column-main column connecting step. 12 is the same as the connection method and connection structure.

  That is, at the node 18b at the bend point, the third connecting member 30 includes a bracket 27a that is externally fitted and fixed to the second reinforcing column 23, a bracket 12b that is externally fitted and fixed to the main column 12, and an angle member. And a third reinforcing connecting member 30a. The brackets 27a and 12b are connected to each other by the third reinforcing connecting member 30a in the same manner as the second connecting member 28. At this time, the two third reinforcing connecting members 30a are arranged symmetrically with the two second reinforcing connecting members 28a in a direction substantially orthogonal to the direction in which the power transmission line 102 extends.

  In the node 18c at the lower side of the first arm 6, the third connecting member 30 is constituted by a bracket 12b that is externally fitted and fixed to the main pillar 12, and a third reinforcing connecting member 30a made of an angle member. The And the bracket 12b and the rib 23b provided in the 2nd reinforcement support | pillar 23 are connected by the 3rd reinforcement connection material 30a similarly to the case of the said 2nd connection material 28. FIG. At this time, the two third reinforcing connecting members 30a are arranged symmetrically with the two second reinforcing connecting members 28a in a direction substantially orthogonal to the direction in which the power transmission line 102 extends.

  Further, in the connecting member-main column connecting step, the first reinforcing connecting member 27b and each of the main joints are provided at the lowermost node 18a, the bend point node 18b, and the node 18c at the lower side of the first arm 6, respectively. The column 12 is connected to the fourth connecting member 32. This connecting material-main pillar connecting step is included in the concept of the fourth connecting step of the present invention.

  First, in the lowest joint 18a, the fourth connecting member 32 includes a substantially octagonal fixing plate 32a, four fourth reinforcing connecting members 32b made of an angle member, and an end joint member 32c. In the lowermost node 18a, the fixing plate 32a is overlapped and coupled on the center position in the longitudinal direction of the first reinforcing connecting member 27b. Then, the end joint member 32c is joined to one end portion of the four fourth reinforcing connecting members 32b. And each 4th reinforcement connection material 32b is arrange | positioned so that it may extend linearly along the diagonal of the square from the fixed board 32a to the main pillar 12 side located in each vertex of a square, The each 4th reinforcement connection material 32b The end coupling member 32c coupled to one end of each of the first reinforcing coupling members 32b is coupled to the rib 12d provided on the corresponding main pillar 12, and the other end of each fourth reinforcing coupling member 32b is coupled under the fixing plate 32a. Let In addition, each fourth reinforcing connecting member 32b intersects the first connecting bar 21a at a part near the center position in the longitudinal direction, so that the part is coupled to the corresponding first connecting bar 21a.

  Further, at the node 18b at the bend point, the fourth connecting member 32 includes a fixing plate 32a, four fourth reinforcing connecting members 32b made of angle members, and a bracket 12b that is externally fitted and fixed to each main pillar 12. It is comprised by. In the node 18b at the bend point, one end portion of each fourth reinforcing connecting member 32b is placed on the bracket 12b fixed to the corresponding main pillar 12 and coupled to the bracket 12b. Similarly to the case, the first reinforcing connecting member 27b and each main pillar 12 are connected.

  Further, at the node 18c at the lower side of the first arm 6, the fourth connecting member 32 is fixed to the fixing plate 32d, two types of fourth reinforcing connecting members 32e and 32f made of angle members, and the main pillars 12 to the outside. The bracket 12b is fitted and fixed. In the node 18c, the fixing plate 32d is installed on the longitudinal center position of the first reinforcing connecting member 27b, and the fixing plate 32d is coupled to the first reinforcing connecting member 27b.

  One of the two types of fourth reinforcing connecting members 32e, 32f has a length substantially equal to the distance between the two main pillars 12 positioned diagonally. The other fourth reinforcing connecting member 32f has about half the length of the fourth reinforcing connecting member 32e. Then, the shorter fourth reinforcing connecting member 32f is fixed to the fixing plate 32d so as to straddle the bracket 12b fixed to one main pillar 12 (the upper left main pillar 12 in FIG. 8). And the other end of the fourth reinforcing connecting member 32d and the other end of the fourth reinforcing connecting member 32e and the bracket 12b are coupled to each other. Similarly, the other shorter fourth reinforcing connecting member 32f extends over the bracket 12b fixed to the other main pillar 12 (the lower right main pillar 12 in FIG. 8) from the fixing plate 32d. And are coupled to the fixing plate 32d and the bracket 12b. In addition, these two 4th reinforcement connection materials 32f are arrange | positioned so that it may be located on a straight line. Further, the fourth reinforcing connecting member 32e having the longer length is arranged on a diagonal line orthogonal to the diagonal line on which the fourth reinforcing connecting member 32f having the shorter length is arranged, and the fourth reinforcing connecting member 32e of the fourth reinforcing connecting member 32e is arranged. Both ends are overlapped and coupled to brackets 12b fixed to corresponding main pillars 12 (upper right main pillar 12 and lower left main pillar 12 in FIG. 8), and the fourth reinforcing connecting member 32e A portion in the vicinity of the center position in the longitudinal direction is overlapped and joined on the fixing plate 32d. Instead of the fourth reinforcing connecting member 32e having a longer length, the same two reinforcing reinforcing members 32e having the smaller length may be used.

  And after each said connection process, the removal process which removes the removal site | part which consists of a site | part from the upper end of the ground wire arm 4 and the tower main body 2 to the lower end of the 1st component 12a is performed (refer FIG.9 and FIG.10). ). In this removal step, first, the two aerial ground wires 104 are removed from the corresponding ground wire arms 4 and temporarily supported on the upper portions of the first arms 6. Thereafter, the two ground arms 4 are removed, and further, the component 12a constituting the uppermost part of each main pillar 12 of the tower main body 2 is removed from the component 12a on the lower side, thereby removing the existing steel tower from the existing tower. To remove.

  Thereafter, at the height position of the lower end of the removal site, that is, the position of the upper end of the existing steel tower after removing the removal site, as shown in FIG. While connecting each other, the connecting step between the upper ends of the reinforcing columns, the connecting step between the first reinforcing column and the near main column, the connecting step between the first reinforcing column and the distant main column, the connecting step between the second reinforcing column and the near main column, and the second reinforcement. The connection structure related to the reinforcing columns 22 and 23 is formed by the column-distant main column coupling step.

  Specifically, in the connecting step between the main pillars, the brackets 12b are externally fitted and fixed to the upper ends of the main pillars 12, and the brackets 12b attached to the adjacent main pillars 12 are connected to each other by the main pillar horizontal connecting member 19. Link.

  Further, in the connection step between the upper ends of the reinforcing columns, the upper end of the first reinforcing column 22 and the upper end of the second reinforcing column 23 are connected by the first horizontal connecting member 27 at the position of the upper end of the existing steel tower after the removal site is removed. Connect to each other. This connection step between the upper ends of the reinforcing struts is included in the concept of the first connection step and the horizontal connection step of the present invention. Specifically, the first horizontal connecting member 27 used in the connecting step between the upper ends of the reinforcing struts has a pair of brackets 27a and two first reinforcing connecting members 27b made of an angle member or the like. And in this reinforcement strut upper end connection process, the two 1st reinforcement connection materials which extend horizontally in the direction in which brackets 27a previously attached to the upper ends of both reinforcement struts 22 and 23 are almost orthogonal to transmission line 102 By connecting by 27b, both the reinforcement support | pillars 22 and 23 are connected. The two first reinforcing connecting members 27b are arranged so as to be parallel and in contact with each other, and are fixed to the lower surface of the bracket 27a.

  Further, in the first reinforcing column-near main column connecting step, the first reinforcing column 22 is more than the second reinforcing column 23 among the four main columns 12 at the position of the upper end of the existing steel tower after the removal site is removed. The upper ends of the two main pillars 12 close to each other and the upper ends of the first reinforcing columns 22 are connected by a second connecting member 28. This first reinforcing column-near main column connecting step is included in the concept of the second connecting step of the present invention. Specifically, the second connecting member 28 used in the first reinforcing column-near main column connecting step includes a bracket 27a attached to the upper end of the first reinforcing column 22 and two second reinforcing members made of angle members. It consists of a material 28a and a bracket 12b attached to the upper ends of the two main pillars 12 closer to the first reinforcing pillars 22. In the first reinforcing column-near main column connecting step, one of the bracket 27a attached in advance to the upper end of the first reinforcing column 22 and the two main columns 12 closer to the first reinforcing column 22 is provided. The second reinforcing connecting member is disposed so as to straddle the second reinforcing connecting member 28a on the bracket 12b that is externally fitted and fixed to the upper end of the main pillar 12 (the upper left main pillar 12 in FIG. 11). Each end of 28a is coupled to a corresponding bracket 27a or 12b. Also, the bracket 27a attached to the upper end of the first reinforcing column 22 and the other main column 12 of the two main columns 12 closer to the first reinforcing column 22 (the main column 12 on the lower left side in FIG. 11). It is arranged so as to straddle the other fifth reinforcing connecting member 42a on the bracket 12b that is externally fitted and fixed to the upper end of the upper end of each of the fifth reinforcing connecting members 42a. Combine.

  In the first reinforcing column-distant main column connecting step, the second reinforcing column than the first reinforcing column 22 among the four main columns 12 at the position of the upper end of the existing steel tower after the removal site is removed. The upper ends of the two main pillars 12 (two main pillars 12 far from the first reinforcing pillars 22) near 23 and the upper ends of the first reinforcing pillars 22 are connected by a fifth connecting member 42. This first reinforcing column-distant main column connecting step is included in the concept of the fifth connecting step of the present invention. Specifically, the fifth connecting member 42 used in the first reinforcing column-distant main column connecting step includes a bracket 27a attached to the upper end of the first reinforcing column 22 and two fifth reinforcing members made of angle members. The connecting member 42 a and the bracket 12 b attached to the upper ends of the two main pillars 12 far from the first reinforcing column 22. In the first reinforcing column-distant main column connecting step, one of the bracket 27a attached in advance to the upper end of the first reinforcing column 22 and the two main columns 12 far from the first reinforcing column 22 is used. The fifth reinforcing connection member 42a is disposed so as to straddle the bracket 12b that is externally fitted and fixed to the upper end of the main pillar 12 (the upper right main pillar 12 in FIG. 11). Each end of the material 42a is coupled to the corresponding bracket 27a or 12b. Further, the bracket 27a attached to the upper end of the first reinforcing column 22 and the other main column 12 (the main column 12 on the lower right side in FIG. 11) of the two main columns 12 far from the first reinforcing column 22 ) Is placed so as to straddle the other fifth reinforcing connecting member 42a under the bracket 12b that is externally fitted and fixed to the upper end, and each end of the fifth reinforcing connecting member 42a is set to the corresponding bracket 27a or 12b. To join.

  Further, in the second reinforcing column-near main column connecting step, the second reinforcing column 23 is more than the first reinforcing column 22 among the four main columns 12 at the position of the upper end of the existing steel tower after the removal site is removed. The upper ends of the two main pillars 12 that are close to each other and the upper ends of the second reinforcing columns 23 are connected by a third connecting member 30. This second reinforcing column-near main column connecting step is included in the concept of the third connecting step of the present invention. The third connecting member 30 used in the second reinforcing column-near main column connecting step includes a bracket 27a attached to the upper end of the second reinforcing column 23, two third reinforcing connecting members 30a made of an angle member, 2 It consists of the bracket 12b attached to the upper end of the two main pillars 12 closer to the reinforcing support 23. In the second reinforcing column-near main column connecting step, the two main columns 12 closer to the upper end of the first reinforcing column 22 by the second connecting material 28 in the first reinforcing column-near main column connecting step. The upper end of the two main pillars 12 that are closer to the upper end of the second reinforcing column 23 are connected by the third connecting member 30 in a connection structure that is symmetrical to the connection structure that connects the upper ends of the two reinforcing columns. That is, in this connection step, the third reinforcing connecting member 30a is arranged so as to be bilaterally symmetrical with the second reinforcing connecting member 28a.

  Further, in the second reinforcing column-distant main column connecting step, the first reinforcing column is more than the second reinforcing column 23 among the four main columns 12 at the position of the upper end of the existing steel tower after the removal site is removed. The upper ends of the two main pillars 12 (two main pillars 12 far from the second reinforcing pillars 23) close to 22 and the upper ends of the second reinforcing pillars 23 are connected by a sixth connecting member 44. This second reinforcing column-distant main column connecting step is included in the concept of the sixth connecting step of the present invention. The sixth connecting member 44 used in the second reinforcing column-distant main column connecting step includes a bracket 27a attached to the upper end of the second reinforcing column 23, two sixth reinforcing connecting members 44a made of angle members, The bracket 12b is attached to the upper ends of the two main pillars 12 far from the second reinforcing column 23. In the second reinforcing column-distant main column connecting step, the first reinforcing column 22 and the two distant main columns 12 are separated by the fifth connecting member 42 in the first reinforcing column-distant main column connecting step. The upper end of the two main pillars 12 far from the upper end of the second reinforcing support 23 by the sixth connecting member 44 is a connecting structure that is bilaterally symmetrical to the connection structure that connects the upper end of the first reinforcing support 22 and the upper end of the first reinforcing support 22. And That is, in this connecting step, the sixth reinforcing connecting member 44a is arranged so as to be bilaterally symmetric with the fifth reinforcing connecting member 42a. In this connecting step, the sixth reinforcing connecting member 44a positioned on the upper side in FIG. 11 intersects the fifth reinforcing connecting member 42a below the fifth reinforcing connecting member 42a positioned on the upper side in FIG. While arrange | positioning, each edge part of the said 6th reinforcement connection material 44a is fixed with respect to the lower surface of the bracket 12b or 27a. In this connecting step, the sixth reinforcing connecting member 44a located on the lower side in FIG. 11 intersects the fifth reinforcing connecting member 42a above the fifth reinforcing connecting member 42a located on the lower side in FIG. The end portions of the sixth reinforcing connecting member 44a are fixed to the upper surface of the bracket 12b or 27a.

  Next, after energization of each power transmission line 102 on the right line side is stopped, as shown in FIG. 12, the three-phase power transmission line 102 on the right line side is detached from the corresponding arms 6, 8, and 10. The right line temporary support process of temporarily supporting the main pillar 12 of the tower main body 2 is performed.

  Then, the raising process which raises the existing steel tower (steel tower main body 2) is performed. In this raising process, as shown in FIG. 13, the lower end part of each main pillar part 12c of the new installation part 2a newly installed in the upper end part of the main pillar 12 after a removal site | part was removed by the said removal process is combined. . The new site 2a has a height greater than the height of the removal site.

  And the new ground arm 4a is installed so that it may protrude from the upper end part of the newly provided site | part 2a to the right line side. In addition, a new first arm 6a is installed so as to project to the right line side at an intermediate position between the upper end portion of the newly installed part 2a and the installation position of the first arm 6 on the original right line side. Thereby, on the right line side, the original first arm 6 in the existing steel tower becomes the second arm 8a of the raised steel tower, and the original second arm 8 in the existing steel tower becomes the third arm 10a of the steel tower after raising. It becomes.

  Next, the overhead ground wire 104 on the right line side temporarily supported on the upper part of the original first arm 6 on the right line side is supported by the new ground arm 4a and temporarily supported on the main pillar 12 of the tower main body 2. The three-phase power transmission line 102 on the right line side that has been made to support is supported by the corresponding arms 6a, 8a, and 10a, respectively. That is, the upper power transmission line 102a is supported by the new first arm 6a, the middle power transmission line 102b is supported by the new second arm 8a, and the lower power transmission line 102c is supported by the new third arm 10a. Thereafter, the original third arm 10 on the right line side is removed.

  Next, energization of each power transmission line 102 on the right line side is resumed, and then power supply to each power transmission line 102 on the left line side is stopped. Then, as shown in FIG. A simple ground arm 4a and a new first arm 6a are installed in the newly installed part 2a in the same manner as the right line side. Thereby, also on the left line side, the original first arm 6 in the existing tower becomes the second arm 8a of the raised tower, and the original second arm 8 in the existing tower is the third arm of the raised tower. 10a.

  Thereafter, as in the case of the right line side, the left ground side overhead ground wire 104 temporarily supported on the upper portion of the original first arm 6 on the left line side is supported by the new ground arm 4a. The left line side three-phase power transmission line 102 temporarily supported by the main pillar 12 of the tower main body 2 is supported by the corresponding arms 6a, 8a, and 10a, respectively. Finally, the original third arm 10 on the left line side is removed.

  In this way, the steel tower of FIG. 15 which is raised and reinforced is formed.

  As described above, in this embodiment, in the column erecting step, the first reinforcement column 22 and the second reinforcement column 23 are erected in a rectangular area formed by connecting adjacent main columns 12 of the steel tower. Therefore, the required land area does not increase by the installation. Further, in the present embodiment, the first reinforcing column 22 and the second reinforcing column 23 are erected in a rectangular area formed by connecting the adjacent main columns 12 to each other, and both the reinforcing columns 22 and 23 are provided. Since the reinforcing posts 22 and 23 and the main pillar 12 positioned outside thereof are connected to each other at a plurality of locations in the height direction, the portions near the foundation of the steel tower are supported by reinforcing legs extending obliquely from both outsides. Unlike the case where the reinforcement is performed, the reinforcement region is hardly limited in the height direction, and the strength can be increased by the reinforcement from the inside of the steel tower up to the upper part of the steel tower after being raised. In addition, in the present embodiment, the first reinforcing column 22 and the second reinforcing column 23 are erected so as to be aligned in a direction substantially orthogonal to the direction in which the power transmission line 102 extends. The strength (strength against external force in the horizontal direction) of the later steel tower can be increased. As a result, in this embodiment, the lack of strength of the steel tower after raising against the force received by the wind pressure can be solved from the lower part to the upper part of the steel tower. Therefore, in this embodiment, while preventing an increase in the required land area, it is possible to eliminate the lack of strength of the transmission line tower from the lower part to the upper part of the tower after raising the floor against the force received by the wind pressure.

  By the way, in the reinforcing method in which the steel tower is reinforced with the reinforcing legs extending obliquely from the foundation outside the steel tower, it is difficult to add the reinforcing legs in the vertical direction. For this reason, in such a reinforcement method, it is limited to reinforcement of the low area | region of a steel tower. On the other hand, in the present embodiment, the reinforcing columns 22 and 23 are connected by vertically connecting the column-constituting members inside the quadrangular region formed by connecting adjacent main columns 12 of the power transmission tower. Since it forms, a steel tower can be reinforced over the wide range of a height direction.

  In the present embodiment, the first reinforcing column-main column connecting step is performed during the first reinforcing column 22 erecting step, and the second reinforcing column-main column connecting step is the second reinforcing column 23 standing. Since it is carried out during the installation process, a plurality of strut constituent members are connected upward to form the reinforcing struts 22 and 23, and the connected strut constituent members are connected to and supported by the main pillars by the connecting members 28 and 30. Can do. Therefore, the long reinforcing struts 22 and 23 can be formed while supporting the reinforcing struts 22 and 23 so as not to fall within the area surrounded by the main pillars 12.

  In the present embodiment, the first reinforcing strut 22 and the second reinforcing strut 23 are connected to each other by the first horizontal connecting member 27 extending in the horizontal direction between them in the horizontal connecting step between the reinforcing struts. The strength of the steel tower against the stress in the horizontal direction can be effectively increased.

  Further, in the present embodiment, a plurality of first oblique connection members 26 that extend obliquely with respect to the height direction between the first reinforcement support 22 and the second reinforcement support 23 and intersect each other in the reinforcement connection support oblique connection step. Since the first reinforcing column 22 and the second reinforcing column 23 are connected to each other, a truss structure can be formed between the two reinforcing columns 22 and 23, and the strength of the steel tower can be further increased.

  Further, in the present embodiment, in addition to connecting each reinforcing column 22, 23 to the corresponding main pillar 12 via the second connecting member 28 or the third connecting member 30, the reinforcing column 22, 23 is connected to the first column. Each main pillar 12 is connected via a horizontal connecting member 27 and a fourth connecting member 32. For this reason, the structure comprised by connection with each reinforcement support | pillars 22 and 23 and the main pillar 12 becomes stronger, As a result, the intensity | strength of the steel tower after raising can be raised more.

  In the present embodiment, the first reinforcing column 22 and the second reinforcing column 23 are positioned at the lowest position among the arms 6a, 8a, and 10a on which the plurality of transmission lines 102 are laid on the transmission line tower after raising the first reinforcement column 22 and the second reinforcement column 23. It is erected so as to extend to a position higher than the third arm 10a. For this reason, both the reinforcing struts 22 and 23 are extended to a position higher than the position of the power transmission line 102c located at the lowest position among the transmission lines 102 that receive wind pressure in the steel tower after raising the height. Can support steel towers. For this reason, compared with the case where the reinforcing column extends only to a position lower than the third arm 10a in the raised steel tower, it is possible to more effectively ensure the strength of the raised steel tower against the wind pressure received by the transmission line 102. it can.

  Moreover, in this embodiment, the two main pillars 12 and the first reinforcement pillars 22 that are closer to the first reinforcement pillars 22 than the second reinforcement pillars 23 among the main pillars 12 are coupled by the second coupling members 28, Of the main pillars 12, the two main pillars 12 closer to the second reinforcing pillars 23 than the first reinforcing pillars 22 are connected to the second reinforcing pillars 23 by the third connecting members 30. For this reason, while connecting the 1st reinforcement support | pillar 22 and the two main pillars 12 far from the said 1st reinforcement support | pillar 22 with a 2nd connection material, it is far from the 2nd reinforcement support | pillar 23 and the said 2nd reinforcement support | pillar 23. Compared with the case where the two main pillars 12 are connected to each other by the third connecting material, the second connecting material 28 and the third connecting material 30 having a smaller length can be used. For this reason, material costs can be reduced and the weight of the steel tower after raising can be reduced. Moreover, in this embodiment, since the main pillar 12 close | similar to each reinforcement support | pillar 22 and 23 is connected with the connection material with small length, it can raise the connection intensity | strength of the reinforcement support | pillars 22 and 23 and the main pillar 12 effectively. It becomes possible. For this reason, the intensity | strength of the whole steel tower after raising including the reinforcement support | pillars 22 and 23 can be raised effectively.

  Moreover, in this embodiment, after removing the removal site | part of an existing steel tower, in the connection part of the newly installed site | part 2a newly installed and the existing site | part of a steel tower instead, it is both reinforcement struts 22 and 23 by the 1st horizontal connection material 27. The first reinforcing column 22 and each main column 12 are connected by the second connecting member 28 and the fifth connecting member 42, and the second reinforcing column 23 is connected by the third connecting member 30 and the sixth connecting member 44. In order to connect the main pillars 12 to each other, it is possible to configure a structure in which the stress is transmitted from the newly installed portion 2a to the reinforcing struts 22 and 23 in the connection portion. As a result, the weight of the new site 2a, the wind pressure received by the power transmission line 102 or the overhead ground wire 104 supported by the new site 2a and the arms 6a, 4a provided in the new site 2a, and the like are received by each main column 12 and each reinforcement column 22. , 23 can be supported well.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, a connecting structure formed at the upper end of the existing steel tower after removing the removal site at the height position where each power transmission line arm 6a, 8a, 10a is provided on the power transmission line tower. It may be formed. In this case, the power transmission line arms 6a, 8a and 10a are included in the concept of the overhead line part of the present invention. FIG. 16 shows an example in which this connection structure is formed at a node on the lower side of the third power transmission line arm 10a in the power transmission line tower. In addition, you may form the same connection structure also in the node of the lower side of the other power transmission line arm 6a, 8a among the power transmission towers.

  In a portion of the transmission line tower where the transmission line arm is provided, stress due to the wind pressure received by the transmission line 102 is applied. In the configuration of this modified example, at the height position where the transmission line arm is provided, the corresponding reinforcing struts 22 and 23 and the main pillars 12 or the two reinforcing struts 22 and 23 are connected to each other by the connecting members. The stress resulting from the wind pressure received by the electric wire 102 can be satisfactorily transmitted from the power transmission line arm to each of the reinforcing columns 22 and 23. As a result, it is possible to satisfactorily support the stress caused by the wind pressure that the power transmission line 102 receives.

  Moreover, in the place which performs the connection process of the reinforcement pillars 22 and 23 and the distant main pillar 12, the 1st reinforcement pillar 22 and the near main pillar 12 are connected using the 2nd reinforcement connection material 28a. The second reinforcing column-main column connecting step of connecting the second reinforcing column 23 and the main column 12 closer to the second reinforcing column 23 using the reinforcing column-main column connecting step and the third reinforcing connecting member 30a may be omitted. .

  Further, at the nodes other than the lowermost node 18a of the tower body 2, the node 18b of the bend point, and the node 18c at the lower side of the first arm 6, the reinforcing columns 22, 23 are connected to each other, The main pillar 12 may be connected.

  Further, the connection between the first horizontal connecting member 27 and the main pillar 12 by the fourth connecting member 32 may be omitted.

  Moreover, in the said embodiment, although the reinforcement support | pillars 22 and 23 were comprised by the support | pillar structure member which consists of a concrete filling steel pipe, you may comprise the reinforcement support | pillars 22 and 23 by the support | pillar structure member which consists of other materials. For example, the strut component may be made of a steel pipe not filled with concrete, a solid bar, L-shaped steel, H-shaped steel, or the like. Further, the shape of the steel pipe of the support member may be other than a cylindrical shape. For example, the steel pipe of the column constituting member may be a square tubular steel pipe.

  Moreover, in the said embodiment, although the main-body part used what consists of a pipe as the 1st diagonal connection material 26, you may use the 1st diagonal connection material of the structure of other than that. For example, you may use the 1st diagonal connection material by which the main-body part was comprised by angle material, L-shaped steel, H-shaped steel, etc.

6a, 8a, 10a Transmission line arm (overhead part)
12 main pillar 22 first reinforcing support 23 second reinforcing support 25 first connecting member 28 second connecting member 30 third connecting member 32 fourth connecting member 42 fifth connecting member 44 sixth connecting member 102 power transmission line

Claims (10)

An existing installation that is provided with a main pillar that is erected at a position corresponding to each vertex of a quadrilateral at the installation location, and that is adjacent to each other, and that supports a power transmission line extending in a direction substantially parallel to one side of the quadrilateral. With the raising of the transmission line tower, the reinforcement construction method for raising the transmission line tower for reinforcing the transmission line tower,
A first reinforcement lined up in a direction intersecting with the direction in which the power transmission line extends by connecting a plurality of strut members of a predetermined length in the vertical direction within a quadrangular region formed by connecting adjacent main pillars. A column erecting step for erecting the column and the second reinforcing column;
A first connecting step of connecting the first reinforcing strut and the second reinforcing strut by a first connecting member at a plurality of locations in the height direction, respectively;
The two main pillars located on one side in the direction in which the first reinforcement pillars and the second reinforcement pillars are arranged and the first reinforcement pillars are connected to each other at a plurality of positions in the height direction by the second connecting members. A second connecting step,
The two main pillars and the second reinforcement pillars that are located on the other side in the direction in which the first reinforcement pillars and the second reinforcement pillars are arranged are coupled to each other at a plurality of positions in the height direction by a third coupling member. A reinforcing method for raising the power transmission tower, comprising a third connecting step. The second connecting step is performed in the middle of connecting the plurality of column constituting members constituting the first reinforcing column in the column erecting step, and the column connected on the lower column constituting member. Connecting the component member to the two main pillars located on the one side by the second connecting member;
The third connecting step is performed in the middle of connecting the plurality of column constituting members constituting the second reinforcing column in the column erecting step, and the column connected on the lower column constituting member. The reinforcing method for raising the transmission line tower according to claim 1, comprising a step of connecting a component member to the two main pillars located on the other side by the third connecting member.   The first connection step includes a horizontal connection in which the first reinforcement column and the second reinforcement column are connected to each other by the first connection member extending in the horizontal direction between the first reinforcement column and the second reinforcement column. The reinforcement construction method for raising the tower for power transmission lines according to claim 1 or 2 including a process.   In the first connection step, in addition to the horizontal connection step, a plurality of the first connection members that extend obliquely with respect to the height direction between the first reinforcement column and the second reinforcement column and intersect each other. The reinforcement construction method for raising the transmission line tower according to claim 3, comprising an oblique connection step of connecting the first reinforcement column and the second reinforcement column to each other.   5. For raising the transmission line tower according to claim 1, further comprising a fourth connecting step of connecting each first connecting member and each main pillar by a fourth connecting member. Reinforcement construction method. In the transmission line tower, a plurality of transmission lines are spanned at intervals in the height direction,
In the column erecting step, the first reinforcement column and the second reinforcement column are higher than the region located at the lowest position among the regions where the plurality of transmission lines are installed in the transmission line tower after raising the first reinforcement column and the second reinforcement column. The reinforcement construction method for raising the tower for transmission lines according to any one of claims 1 to 5, wherein the reinforcement tower is erected so as to extend to a position. In the second connecting step, two main columns closer to the first reinforcing column than the second reinforcing column out of the main columns standing at a position corresponding to each vertex of the square and the first Reinforcing struts are connected by the second connecting material,
In the third connecting step, two main columns closer to the second reinforcing column than the first reinforcing column out of the main columns standing at a position corresponding to each vertex of the quadrangle and the second column The reinforcement construction method for raising the tower for power transmission lines according to any one of claims 1 to 6, wherein a reinforcing support is connected by the third connecting member. Of the main pillars erected at positions corresponding to the apexes of the square, two main pillars closer to the second reinforcement pillars than the first reinforcement pillars and the first reinforcement pillars are connected in a fifth manner. A fifth connecting step of connecting with a material;
Among the main pillars erected at positions corresponding to the apexes of the square, two main pillars closer to the first reinforcement pillars than the second reinforcement pillars and the second reinforcement pillars are connected in a sixth manner. The reinforcement construction method for raising the tower for transmission lines according to claim 7 provided with the 6th connection process connected with material. At the time of raising the transmission line tower, after removing the removal site, which is a site extending a predetermined length downward from the upper end of the existing transmission line tower, for the transmission line after removing the removal site Connect a new part with a height higher than the removal part to the upper end of the steel tower,
In the column erecting step, both the reinforcement columns are erected so that the first reinforcement column and the second reinforcement column extend to at least the height of the lower end of the removal site in the existing transmission line tower. ,
In the first connecting step, at the height position of the lower end of the removal site, the first reinforcing column and the second reinforcing column are connected to each other by the first connecting member,
In the second connection step, at the height position of the lower end of the removal site, two main columns closer to the first reinforcement column than the second reinforcement column and the first reinforcement column are connected to the second connection member. Connected by
In the fifth connecting step, at the height position of the lower end of the removal site, two main columns closer to the second reinforcing column than the first reinforcing column and the first reinforcing column are connected to the fifth connecting member. Connected by
In the third connecting step, at the height position of the lower end of the removal site, the two main columns closer to the second reinforcing column than the first reinforcing column and the second reinforcing column are connected to the third connecting member. Connected by
In the sixth connecting step, at the height position of the lower end of the removal site, two main columns closer to the first reinforcing column than the second reinforcing column and the second reinforcing column are connected to the sixth connecting member. The reinforcement construction method for raising the steel tower for power transmission lines according to claim 8, wherein the steel towers are connected together. In the first connecting step, the first reinforcing column and the second reinforcing column are connected to the first reinforcing column at the height position where the overhead line portion, which is a portion where the transmission line is built, is provided in the transmission line tower. Connected to each other by a connecting material,
In the second connecting step, the two main columns closer to the first reinforcing column than the second reinforcing column and the first reinforcing column are connected to the second connecting column at a height position where the overhead wire portion is provided. Connected by material,
In the fifth connecting step, at the height position at which the overhead wire portion is provided, two main columns closer to the second reinforcing column than the first reinforcing column and the first reinforcing column are connected to the fifth connecting column. Connected by material,
In the third connection step, the two main columns closer to the second reinforcement column than the first reinforcement column and the second reinforcement column are connected to the third connection column at a height position where the overhead wire portion is provided. Connected by material,
In the sixth connecting step, at the height position where the overhead wire portion is provided, two main columns closer to the first reinforcing column than the second reinforcing column and the second reinforcing column are connected to the sixth connecting column. The reinforcement construction method for raising the tower for power transmission lines according to claim 8 or 9, which is connected by a material.

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