JP2947202B2 - Seismic retrofitting method of support cradle for supporting insulators to receive aerial terminal connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial terminal connection in which an existing support base for supporting insulators on which an aerial terminal connection (cable head) used in an underground power transmission line is mounted is subjected to simple reinforcement to obtain an earthquake-resistant structure. The present invention relates to a method for seismic reinforcement of a support stand for a support insulator receiving a part.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 6, for example, as shown in FIG. 6, a simple channel steel (a so-called channel) is used as a support base for an aerial terminal connection portion used for connecting an overhead line and a cable in an underground power transmission line. 1 is used as a support stand 2 for a support insulator, and an installation method in which an aerial terminal connection portion 4 is erected by interposing a support insulator 3 having an insulator configuration to be used as a leg portion on the upper groove side 1a. I am taking it. In this case, the aerial termination connection 4 may be quite heavy (e.g.
In the 6KV mode, the overall length is 1.2 m, the weight is about 250 kg, and three of them are provided.) The channel steel itself is designed as a beam having predetermined rigidity. It is not anticipated that a large-scale earthquake will sway, causing a large swing in the upper groove side part 1a and a load on the support insulator 3 using the legs, which often causes the support insulator 3 to be damaged (broken). Is happening.

[0003] That is, in recent years, this type of support gantry for supporting insulators using a channel steel has been provided with a quake-resistant structure capable of withstanding a large-scale earthquake in advance. Many of the existing (old type) support bases for support insulators have not been considered to have enough strength to withstand large-scale earthquakes. For this reason, the recent Miyagi-ken Oki earthquake or Hanshin
It was not possible to deal with large-scale earthquakes such as the Awaji Earthquake. In the case of the simple channel steel 1 having the support base 2 for receiving the aerial terminal connection portion 4, the upper groove side portion 1a locally undergoes large swing deformation due to the shaking of the earthquake (see the dotted line in FIG. 7), Due to this deformation, the channel steel 1 and the air terminal connection 4
This causes breakage of the supporting insulator 3 between them, which leads to an accident in which the upper air terminal connection itself is inclined.
However, the configuration of the support insulator 3 is not limited to a single support insulator mounting bolt facing the aerial terminal connection side, but is provided with a receiving bolt 5a and a fixing bolt 5b facing the support pedestal side due to the requirement of insulation. It has a separated structure, so that the insulator itself is fragile against vibration.

[0004]

In this case, an appropriate reinforcing member (fitting) is attached to the existing support gantry for the support insulator, which is made of a channel steel.
Naturally, seismic countermeasures to be applied are also considered. For example, as shown in FIG. 8, two plate-like ribs 6 serving as reinforcing members are simply arranged orthogonally in the groove frame 1c of the channel steel 1, and the joint between the rib 6 and the channel steel 1 is formed. When welding a is applied to the two to form an integral structure, a seismic structure with increased strength is obtained. However, since the steel material used as the underground power transmission line member is galvanized in order to have an anticorrosion effect, the plated zinc is inevitably vaporized by welding heat when welding is performed. In addition, the installation place of the support stand for the support insulator is often provided in a closed room, etc., and the environmental conditions of the welding work are bad, so that the worker inhales the vaporized gas,
Later, it is a construction method that easily causes so-called zinc heat and lacks safety.
Further, the reinforcement work is generally a stop work in order to perform a safety work. However, in some cases, it is considered that the reinforcement work is performed in an energized state. From this point, a problem remains in the use of the welding work.

In view of the above circumstances, the present invention employs a mechanical reinforcing structure in which a box rib is fitted to a channel steel and bolted, thereby providing a reinforcing operation that does not use a welding operation that may cause zinc vaporized gas. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for seismic reinforcement of a support base for a support insulator for receiving an aerial terminal connection which solves the above-mentioned problems.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a support cradle for a support insulator which receives a submerged terminal connecting portion connecting an overhead line and a cable in an underground power transmission line via a support insulator. A bolt hole is drilled in the lower groove side portion that is on the axis of the support insulator fixing bolt of the insulator support base, and then a box rib that is separately formed in the groove frame and fits in the same groove frame is fitted. The mounting and reinforcing bolts for the supporting insulator inserted from the bolt holes in the lower groove side are screwed into the lower part of the supporting insulator facing the upper surface through the bolt insertion holes in the box ribs and through the bolt holes in the upper groove side, and the mounting and reinforcing are performed. The nuts facing the inner side of the box rib and the side of the lower groove previously screwed to the bolts are respectively fastened to integrate the support base, the box rib, and the support insulator.

As described above, the seismic reinforcement method of the support base for the support insulator which receives the support insulator is such that the box rib is fitted into the groove frame of the channel steel serving as the support base body, and the box rib and the channel steel are vertically penetrated. It is a mechanical work that is tightened and integrated with the mounting and reinforcing bolts that also serve to fix the support insulator that passes through.As a reinforcement work at each site, the predetermined position of the lower groove side part of the laterally arranged channel steel It is sufficient to simply drill a bolt hole (on the mounting line of the support insulator) with a drill or the like, and then remove the fixing bolt of the support insulator placed on the upper groove side, and separately formed inside the groove frame of the channel steel at the factory etc. The box ribs are fitted, the bolt holes on the upper and lower surfaces of the box ribs are aligned with the bolt holes on the upper and lower groove sides, and the mounting / reinforcing bolts that are inserted from the lower groove side are penetrated. Screw the tip into the lower part of the support insulator In other words, according to this seismic reinforcement method, it is only necessary to fit a box rib, which is a separate piece, into the groove frame of the channel steel and tighten it with a bolt, and it is a fire-free construction method without welding, and is suitable for reinforcement work of underground power transmission lines. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of an apparatus for directly carrying out the method for directly reinforcing the seismic retrofit of a support cradle for a support insulator for receiving an aerial terminal connection according to the present invention with reference to the drawings.

FIGS. 1 to 5 show an embodiment in which a box rib is used as a reinforcing member in an existing channel steel groove frame. First, as the configuration of the existing non-reinforced support pedestal, for example, two channel steels (channels) 1 are arranged in parallel on a pedestal member 7 at predetermined intervals to form a support pedestal 2 for a support insulator. A fixing bolt 5b is inserted from below into a bolt hole 8 drilled at a predetermined position on the upper groove side portion 1a of each of the channel steel members 1 at right and left positions (four front and rear positions as a whole). Is screwed and fixed to the lower part of the support insulator 3 serving as a leg member of the aerial terminal connection part 4 (see FIG. 5A), and the receiving bolt 5a protruding above the support insulator 3 is connected to the conical column-shaped aerial terminal. This is a configuration in which the aerial terminal connection part 4 is screwed into the receiving seat part 4a of the connection part 4 and is arranged on the support base 2 (see FIG. 6). That is, in this case, the support of the aerial terminal connection part 4 is received only by the upper groove side part 1a which is one side of the channel steel 1 via the support insulator 3, and therefore, in the case of a large-scale earthquake, The deflection of the groove side portion 1a becomes large, and an excessive load is applied to the support insulator. Reference numeral 9 denotes an overhead wire derived from the head of the aerial terminal connection part 4, and reference numeral 10 denotes a cable introduced to a lower end of the aerial terminal connection part 4.

Here, the upper groove side portion 1 of the channel steel 1 used as an earthquake-resistant reinforcing member for the support stand 2 for the support insulator.
The configuration of the box rib 11 to be fitted into the groove frame 1c between the upper groove side 1a and the lower groove side 1b is such that the inclined surface c having an inclination corresponding to the inner gradient b of the upper groove side 1a and the lower groove side 1b is raised. Lower plate surface 11
The box ribs 11 are formed separately on the factory side, provided in the housings a and 11b and provided with bolt insertion holes 12 and 12 at the center positions of the respective plate surfaces.

First, a bolt hole is positioned at a position on the lower groove side portion 1b of the channel steel 1 on the axis of the fixing bolt 5b of the support insulator 3 on the upper groove side portion 1a side, and then a drill or the like is used. Bolt holes 13 are mechanically held with a tool (not shown).
Pierce. Thereafter, the fixing bolt 5b to which the support insulator 3 mounted on the upper surface of the upper groove side portion 1a is attached is removed and removed (see FIG. 5A). Under this condition, the box rib 11 is fitted into the groove frame 1c. At this time, the upper and lower plate surfaces 11a,
The bolt insertion holes 12 and 12 of 11b, the bolt hole 8 of the upper groove side part 1a, and the bolt hole 13 of the lower groove side part 1b are set so as to communicate with each other.

Next, a long supporting insulator mounting and reinforcing bolt 14 extending from the lower groove side 1b side of the channel steel 1 to the lower part of the support insulator 3 on the upper groove side 1a is attached to the lower groove side 1b. Bolt insertion hole 1 in upper and lower plate surfaces of box rib 11 from bolt hole 13
2, 12 and the bolt holes 8 of the upper groove side part 1a are sequentially penetrated, and the tip screw part 14a is screwed into the screw hole 15 at the lower part of the support insulator 3 and fixed. At this time, fastening nuts 16a and 16b are screwed in advance to the intermediate portion of the mounting and reinforcing bolts 14 for the supporting insulator facing between the upper and lower plate surfaces 11a and 11b of the box rib 11, and the fastening nuts 16a and 16b are attached. It is tightened and fixed to the inner surface of the turning box rib 11 (see FIG. 5B and FIG. 3A). In this case, a bolt head for screwing a tightening nut 16c to the lower end (base end) of the mounting and reinforcing bolt 14 for the support insulator and tightening it to the lower surface of the lower groove side portion 1b is used.

As described above, the existing fixing bolt 5b provided on the supporting insulator 3 receiving the aerial terminal connection portion 4 is attached to the supporting insulator mounting / reinforcing bolt 14 serving as a through bolt inserted from below the channel steel 1. The support insulator 3
The upper groove side 1a of the channel steel 1 directly receiving the pressure has local beam strength by the box rib 11 having the double plate structure and the mounting and reinforcing bolts 14, so that the upper groove side is subjected to the vibration of the large-scale earthquake. A large swing does not occur in the support insulator mounting portion of the portion 1a, and the support insulator 3 interposed between the upper groove side portion 1a and the air terminal connection portion 4 does not interfere.

That is, since the channel steel 1 is reinforced with beams by the box ribs 11 and the mounting and reinforcing bolts 14 for supporting insulators of through bolts, when the upper channel side 1a is compressed from above, the upper force is applied. Dispersion load is applied to the lower groove side 1b side through the box rib 11, and when it is pulled, compression and compression are performed on two surfaces which are brought to the upper surface via the mounting and reinforcing bolt 14 and the box rib 11. Tension is shared, and local strength can be increased. For this reason, there is no large deflection in the upper groove side portion 1a of the channel steel 1, no unnecessary load is applied to the support insulator 3 on the channel steel 1, and there is no possibility of damage.

Even if the support frame 2 for supporting insulators is in the form of an angle iron (angle) (not shown), a box rib having a three-sided configuration is fitted into the hook-and-break frame to mount and reinforce the supporting insulator. A bolt may be inserted and tightened. However, the mounting / reinforcing bolt at this time may be short, and the upper rib side portion and the box rib are locked, and the back end surface of the box rib is locked to the vertical side portion of the angle iron with another bolt.

[0016]

As described above, according to the method of the present invention for seismic reinforcement of the support cradle for the support insulator receiving the aerial terminal connection part, the support cradle for the channel steel support porcelain is separately formed in the groove frame on the side surface thereof. In addition to fitting the box ribs, and mounting the support insulators with mounting bolts and reinforcing bolts for the supporting insulator that penetrates the box ribs and channel steel, the lower side, which is on the axis of the fixing bolts for the supporting insulators, is used as the on-site reinforcement work. It is easy to handle simply by mechanically drilling a bolt hole at the position of the groove side with a drill or the like. In this case, the fixing of the channel steel and the box rib is performed by the mounting and reinforcing bolts for the supporting insulator using through bolts that reach the support insulator penetrating the box rib and the channel steel, so that the fixing can be performed at once. Of course, since it is screwed and tightened with nuts, it does not require welding work and uses a non-flaming method, so it is most suitable for work on underground transmission line without thermal deformation of channel steel and vaporization of galvanization, which is a problem in the past. Becomes In addition, since the reinforcing structure is a double plate structure in which a box rib is fitted in a groove frame of a channel steel, it is resistant to compression and tension in combination with the vertical structure of the through-hole mounting and reinforcing bolts, and is suitable for large-scale earthquakes and the like. Even if the channel steel swayed due to the deformation, there was no deformation due to runout in the upper groove side where the support insulator faces,
For this reason, the support insulator directly receiving the aerial terminal connection portion is not subjected to an unreasonable load, and is a reinforcement that does not cause breakage. In addition, since the fixing bolt for stopping the supporting insulator is replaced by a mounting and reinforcing bolt serving as a reinforcing member, there is an effect such as simplification from this point.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a method for seismic reinforcement of a support gantry for a support insulator for receiving an aerial terminal connection according to the present invention.

FIG. 2 is a side view of the same.

3A and 3B are diagrams showing a relationship between a box rib and a mounting and reinforcing bolt for a supporting insulator, wherein FIG. 3A is a front view and FIG. 3B is a side view.

FIG. 4 is a perspective view of a box rib.

5A and 5B are diagrams illustrating a state in which a reinforcing member is mounted on a support base for a supporting insulator, wherein FIG. 5A is an explanatory view in which a bolt hole is formed in a lower groove side, and FIG. FIG. 5 is an explanatory view in which a box rib is fitted to the mounting hole and a mounting and reinforcing bolt is inserted.

FIG. 6 is an explanatory view of a conventional support gantry for supporting insulators for receiving an aerial terminal connection portion having a non-seismic structure.

FIG. 7 is an explanatory view showing runout of an upper groove side portion of the support gantry support frame.

FIG. 8 is an explanatory diagram in which a simple rib is applied to a support base for a support insulator and a joint portion is welded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Channel steel 1a Upper groove side 1b Lower groove side 2 Supporting stand for supporting insulator 3 Supporting insulator 4 Air terminal connection part 5a Receiving bolt 5b Fixing bolt 11 Box rib 12 Bolt insertion hole 13 Bolt hole 14 Mounting and supporting for supporting insulator Reinforcement bolt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 48-13791 (JP, U) JP-A 47-2107 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01B 17/00-17/54

Claims (1)

(57) [Claims] 1. A supporting insulator for a supporting insulator for receiving an aerial terminal connecting portion for connecting an overhead line and a cable in an underground power transmission line via a supporting insulator, wherein the supporting insulator for the channel-shaped steel supporting insulator is used. Drill a bolt hole in the lower groove side portion that is on the axis of the fixing bolt, then fit a box rib that fits in the same groove frame separately formed in the groove frame, and then from the bolt hole in the lower groove side portion, A box rib which is inserted and screwed into the lower part of the supporting insulator which passes through the bolt insertion hole of the box rib and faces the upper surface through the bolt hole of the upper groove side, and is screwed into the mounting and reinforcing bolt in advance. A method of seismic reinforcement of a support frame for a support insulator for receiving an aerial terminal connection portion, wherein nuts facing an inner portion and a lower groove side portion are respectively fastened to integrate the support frame, a box rib, and a support insulator.