JP3091145B2 - Replacement method of main column material of steel pipe tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a main pillar of a steel pipe tower such as a transmission line.

[0002]

2. Description of the Related Art In general, an angle material or a steel pipe is used as a main pillar material in a steel tower such as a transmission line, and a steel tower is constructed by assembling the angle material and the steel pipe vertically. And when these towers are installed especially in the factory zone or near the coastline such as oil refineries and steelworks, the main pillars of the tower are affected by the exhaust gas and salt damage discharged from the factory, In particular, in the case of a steel pipe, damage such as corrosion may occur on the outside or inside of the steel pipe due to long-term operation. At present, if such damage is found early by daily inspection by means such as imaging of the inside of the steel pipe, the damaged main column material will be replaced promptly and always safe. A system is adopted in which power is transmitted in a form.

[0003]

However, the replacement of the main pillars in a tower such as a power transmission line requires a large load on the main pillars due to the weight of the overhead wire and the tower itself. From the point of view, the replacement work of the main pillar material in the energized state is only partially observed in the angle steel tower, and is not usually performed, especially in the case of the steel pipe steel tower. For this reason, there has been a demand for a new technology development capable of performing the replacement work of the main pillar material in an energized state while securing sufficient safety. In addition, the usual replacement work of the main pillar material is performed for each pillar pedestal constituting the steel tower, so that the construction period is prolonged.

[0004] Therefore, in the present invention, by adopting frame equipment that is easy, reliable and highly safe to install on a steel pipe tower,
Provided is a method of replacing a main column material of a steel pipe tower, which is free from restrictions on construction time and enables a main column material to be replaced in a short period of time while being energized.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a steel tower frame is constructed by surrounding a lower part of a steel tower composed of steel pipe main column members constituting a plurality of column bases, and a steel pipe in each column base to be replaced is provided. On each steel pipe main pillar located above the main pillar, a jack pedestal made of a divided band system is installed, and a hook is placed close to each steel pipe main pillar of the tower outer frame.
A jack is arranged between the handed-off jack girder and each jack cradle, and each of these jacks is operated and extended, and after each of the steel pipe main pillars to be replaced is extracted, a new steel pipe main is prepared. It is characterized in that the pillars are arranged and assembled. Further, the present invention is characterized in that each of the jack supports is installed so as to overlap with a flange joint or a gusset of each steel pipe main pillar located above the steel pipe main pillar to be replaced. so,
These are the means for solving the problem.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of a method of replacing a main column material of a steel pipe tower according to the present invention. FIG. 1 is a side view showing a vicinity of a main column material to be replaced, and FIG. A
FIG. 3 is a perspective view of the vicinity of the main column of the steel pipe to be replaced, and FIG. 4 is an enlarged view of a portion B in FIG. 1 showing the installation state of the jack cradle. Generally, as the steel pipe tower 1,
The configuration as shown in FIG. 6 is employed. Ground GL 4
A buried pillar 7A constituting a steel pipe main pillar material is buried in a concrete foundation pillar 7 buried in a corner, and each of the buried pillars 7A is provided with a to d pillars (b and c pillars on the back of the paper in FIG. 6). (Not shown) is assembled and constructed. On the column base a, a1, a2, a3,...
However, on the d column base, d1, d2,
d3... are assembled, and the horizontal material 9 and the diagonal material are provided on the surface formed between the column a and the column d via the abdominal material gusset 5 and the intermediate connecting plate 16 installed on each column. 8 are installed to reinforce the tower.

[0007] As shown in FIG. 1, when a part of a steel pipe tower such as a transmission line is found to be damaged by daily inspection by means such as imaging of the inside of the steel pipe, the damaged main column member is damaged. Replacement work must be performed promptly. FIG.
Are steel pipe main column members a1 (and b) in a plurality of column bases including the column base a in the steel pipe tower having four column bases a to d.
Damaged spots are found in one or more of 1 to d1) or early replacement is required in consideration of safety, and these steel pipe main pillars a1 and other replacement work are performed simultaneously. It shows. In general, a tower outer frame 3 is constructed by surrounding a lower part of a steel tower 1 made of steel pipe main column materials constituting a plurality of column bases a to d, and a steel pipe main column material a1 in each column base to be replaced. Each steel pipe main column material located above one or more of b1 to d1, a3 to d located further above a2 to d2 in the example of FIG.
3 (a2 to d2 just above the steel pipe main column members a1 to d1 in each column base to be replaced depending on the positional relationship of the abdominal material gussets 5).
It is needless to say that the jack receivers 2 of the divided band type are installed, and the jacks 6 are arranged between the tower outer frame 3 and the jack receivers 2, respectively. Each jack 6 is operated and extended, and after extracting one or more of the steel pipe main pillars a1 and b1 to d1 to be replaced, a new steel pipe main pillar is arranged and assembled. Is what you do.

More specifically, as shown in FIG. 3, a ready-made pile 15 such as an H-shaped steel is driven into the ground outside each of the four concrete foundation columns 7 of the steel tower 1, and a steel plate box or the like is formed. Are installed, and the tower outer frame 3 constructed on these simple foundations 14 in a form surrounding the lower part of the steel tower 1 is made of H-shaped steel, A tower-like body formed by connecting a large number of frame columns 3A that are erected with respect to 14 and frame beams 3B that are bridged between these frame columns 3A is formed. In the tower outer frame 3 constructed in this manner, each steel pipe main column material located above one or more of the steel pipe main column materials a1 and b1 to d1 in each column base to be replaced, In the example of FIG. 1, as shown in the plan view in FIG. 2, the column bases a3 to d3 of the steel tower extend between four frame girders 3B located at the heights near the web material gusset 5 at a3 to d3. , And the bridges 3C, 3C,... Made of H-shaped steel, etc., are bridged, and each of the column bases a3 is placed on these jacks 3C, 3C.
A pair of jacks 6, 6 are placed at two outer positions of d3 to d3 in order to support a jack receiving base 2 described in detail later.

As shown in FIG. 4, the jack cradle 2 has a diametrically divided surface of a steel pipe main pillar material a3, for example, into which the jack cradle 2 is fitted and installed. As shown in FIG. 4C, the main part is a cylindrical body integrally connected by a number of bolts and nuts 11 by a flange-like mounting band 10 provided on the dividing surface. One cradle 2 of jack cradle 2
A is mounted on the mounting wing 12A extending in the axial direction, and similarly, the mounting wing 12B is also mounted on the other receiving stand 2B. These two mounting wings 12A, B form a 90 ° circumferential angle with each other, but the circumferential angle is appropriately selected. A pair of jacks 6 are pivotally supported on these mounting wings 12A and 12B via U fittings 13 at their upper ends. Each jack cradle 2A,
Disc-shaped flange (stiffener) on the upper end of 2B
14A and 14B are provided and abut against the lower end of the abdominal material gusset 5 (dashed line in the figure).

With such a configuration, each steel pipe main column member a located above one or more of the steel pipe main column members a1 and b1 to d1 in each column base to be replaced.
A jack rest 2 of a band type divided and superimposed on the lower part of each abdominal material gusset 5 installed in 3 to d3
A and 2B are easily and reliably and easily installed so as to surround the steel pipe main pillars a3 to d3 from the diametrical direction of the respective steel pipe main pillars a3 to d3, and connected and fixed to the respective column pedestals with connecting members such as bolts and nuts 11. can do. Then, as shown in FIGS. 4 (A) and 4 (B), a pair of jacks 6, the upper portions of which are pivotally supported by the respective jack receiving bases 2, are provided with the jack receiving beams 3C arranged close to each other. , 3C. Next, when a total of eight jacks 6 are operated and extended by the operation of a hydraulic pump or the like (not shown), the disc-shaped flanges 14A and 14B at the upper end portions of the jack receiving stands 2A and 2B are connected to the abdominal material gusset 5 and the steel pipes. The main column members a3 to d3 are pushed up, and further, a2 to d2 are also raised, and a flange joint 4 which is an upper connecting portion of one or a plurality of steel pipe main column members a1 and b1 to d1 to be replaced. After removing one or more of the steel pipe main pillars a1 and b1 to d1 to be replaced, a new steel pipe main pillar is arranged and assembled. be able to. As for the type of jack, not only a hydraulic jack but also an appropriate one such as an air jack and a screw jack can be adopted.

At this time, with the extension of the jacks 6, the jack receiver 2 presses the web material gusset 5 upward against the jack receiver 3C, and lowers the tower outer frame 3 via the jack receiver 3C. Press Thus, the weight of the tower above the steel pipe main column members a1 to d1 to be replaced with the transmission line or the tower in the tower 1 is reduced by the simple foundation 14 via the frame column 3A.
But below the simple foundation 14 is a ready-made pile 1 such as H-section steel.
5, these loads can be received firmly because they are buried underground. The diagonal members 8 and the horizontal members 9 connected to the steel pipe main column members a1 to d1 to be replaced are previously removed from the gussets 5 connecting these members (the connection bolts and nuts of the upper flange joint 4 are loosened). Removed at the same time as the stage).

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the upper part of the jack receiving beams 3C, 3C of the tower outer frame 3 constructed in the same manner as the above embodiment is shown. Of the steel pipe main pillars a2 to d2 located above one or more of the steel pipe main pillars a1 and b1 to d1 to be replaced. 4 and are placed on top of each other. The jack cradle 2 is the same as that shown in FIG.
In the same manner as the above, the jack supports 2A and 2B of the divided band type are easily and reliably installed easily so as to surround the steel pipe main column members a2 to d2 as if they were simply clamped from the diametrical direction. -It can be connected and fixed to each column pedestal with a connecting tool such as a nut 11.

With this configuration, when each jack 6 is operated and extended by the operation of a hydraulic pump or the like (not shown), the disc-shaped flanges 14A and 14B at the upper ends of the jack receiving stands 2A and 2B connect the upper flange joint 4 to the upper ends. A gap enough to remove the flange joint 4 which is the upper connecting part of one or more of the steel pipe main pillars a1 and b1 to d1 to be replaced. Can be adjusted, and one or more of the steel pipe main pillars a1 and b1 to d1 to be replaced can be extracted and a new steel pipe main pillar can be arranged and assembled. At this time, similarly to the above-described embodiment, with the extension of each of the jacks 6, the jack receiving base 2 moves the steel pipe main column members a2 to d against the jack receiving beam 3C.
The upper flange joint 4 of FIG. 2 is pressed upward, and the tower outer frame 3 is pressed downward via the jack receiving girder 3C. Thus, each steel pipe main pillar material a1 to be replaced with a transmission line, a steel tower, etc.
Although the weight of the tower above d1 is applied to the simple foundation 14 via the frame 3A, the lower part of the simple foundation 14 is buried in the ground by a ready-made pile 15 such as H-shaped steel, so that these loads are strongly strengthened. Can be received. The jack cradle 2 is provided with an upper flange joint 4 of the steel pipe main pillars a2 to d2 located above one or more of the steel pipe main pillars a1 and b1 to d1 to be replaced. Although the example in which it is installed so as to overlap with the lower portion has been described, by appropriately designing the connection form of each flange joint 4, each of the jack pedestals 2 can be replaced with each steel pipe main column member a to be replaced.
Needless to say, it is also possible to overlap and install the lower flange joint 4 of the steel pipe main column members a2 to d2 located above one or more of the one and b1 to d1.

The embodiments of the present invention have been described above. However, within the scope of the present invention, the form of the tower outer frame and its simple foundation, the form of bridging the jack girder, and the number of divisions of the jack girder Installation form on the steel pipe main column material by the shape of the jack support, etc. (if it is possible to push up each steel pipe main column material located at the top of each steel pipe main column material to be replaced, The jack cradle does not necessarily have to be installed so as to overlap the gusset or flange joint.), The mounting form of the jack cradle on the jack girder, the arrangement of the jacks on the jack cradle, the type of jack, The shape of the material gusset, the shape of the connecting plate in the horizontal material, and the like can be appropriately adopted.

[0015]

As has been described in detail above, according to the present invention, a tower outer frame is constructed by surrounding a lower part of a steel tower composed of steel pipe main pillars constituting a plurality of pillar bases, and each pillar to be replaced is provided. On each steel pipe main pillar located above the steel pipe main pillar in the leg, a jack pedestal made of a divided band system is installed, and each of the steel pipe main pillars of the tower outer frame is located close to each of the steel pipe main pillars.
A jack is placed between the jack receiving girder and each jack receiving base that has been bridged, and each of these jacks is operated and extended, and after each steel pipe main column material to be replaced is extracted, a new one is newly obtained. Since the main column of steel pipe is arranged and assembled, the jack cradle made of the divided band method can be easily and reliably secured simply by pinching it from both sides in the diametrical direction of the main column with round cross section. Can be installed respectively. Therefore, by operating each jack by a hydraulic pump or the like to extend it, each steel pipe main column member located above the steel pipe main column member in each column base to be replaced with respect to the tower outer frame is moved upward. Pressing the power transmission line, the tower, etc., to be replaced, ensures that the load, such as the weight of the tower above the steel pipe main column material, is transmitted to the tower outer frame, and that the tower outer frame is strongly I can take it. Therefore, it is possible to safely and surely bear the load on the steel tower when the steel pipe main column material to be replaced is removed, making it possible to replace the main column material while electricity is supplied without stopping power transmission. Even during the replacement work of the main pillars of the steel pipe tower, there is no influence on social life due to a long-term power outage, so there is no restriction on the timing of the work. In addition, it is possible to perform the replacement work by simultaneously removing one or more of the steel pipe main column members to be replaced, and to greatly shorten the construction period.

[Brief description of the drawings]

FIG. 1 is a side view of the vicinity of a steel pipe main pillar to be replaced in a main pillar replacement method according to a first embodiment of the present invention.

FIG. 2 is a plan half view as viewed from an arrow A of FIG. 1;

FIG. 3 is a perspective view of the vicinity of a steel pipe main pillar to be replaced in the main pillar replacement method according to the first embodiment of the present invention.

FIG. 4 is an enlarged view of a portion B in FIG. 1 showing an installation state of a jack cradle in a main pillar replacement method according to the first embodiment of the present invention.

FIG. 5 is a side view of the vicinity of a steel pipe main pillar to be replaced in a main pillar replacement method according to a second embodiment of the present invention.

FIG. 6 is a side view showing a steel pipe tower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel tower a1-d1 ... Steel pipe main pillar material to be replaced 2 ... Jack cradle 3 ... Tower outer frame 3A ... Frame column 3B ... Frame girder 3C ... Jack Receiving girder 4 ・ ・ ・ Flange joint 5 ・ ・ ・ Gabber (diagonal material) gusset 6 ・ ・ ・ Jack 7 ・ ・ ・ Foundation column 8 ・ ・ ・ Diagonal material 14 ・ ・ ・ Simple foundation 15 ・ ・ ・ Prefabricated pile GL ・··Ground

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyotaka Kubota 26 Yanagimachi, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Tokyo Electric Power Company Kawasaki Corporation (72) Inventor Yasuyuki Kajiyama 2-4-1 Uchisaiwaicho, Chiyoda-ku, Tokyo TEPCO Inside Design Co., Ltd. (72) Inventor Shinsaburo Takao 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation (56) References JP-A-6-189421 (JP, A) JP-A-55-136374 (JP, A) JP-A-63-44086 (JP, A) JP-A-56-102357 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 12/10

Claims (2)

(57) [Claims] 1. A steel pipe located on the upper part of a steel pipe main column material in each column base to be replaced by surrounding a lower part of a steel tower composed of steel pipe main column materials constituting a plurality of column bases. On the main pillar material, a jack cradle made of a divided band system is installed, and each of the steel pipe main pillars of the tower outer frame is installed.
After arranging jacks between the jack girder and each jack cradle bridged in close proximity to the material, operating and extending these jacks, and after extracting each steel pipe main column material to be replaced, The main column replacement method for steel pipe towers, where a new main column material is arranged and assembled. 2. The method according to claim 1, wherein each of the jack supports is installed so as to overlap a flange joint or a web gusset of each steel pipe main pillar located above the steel pipe main pillar to be replaced. Item 2. The method for replacing a main pillar of a steel pipe tower according to Item 1.