JPH11262145A - Structure preventing pulled out bolt for power-transmission steel tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent bolts from loosening, and in addition to this, prevent someone from pulling out the bolts, by covering the peripheries of the heads of the bolts and/or the nuts with a thermosetting hardening resin. SOLUTION: Flanges 4, 5 welded fixedly to the respective end surfaces of a main pole material and a base-side steel tower are joined to each other by many bolts 6 and nuts 7. Then, the peripheries of heads 6a of the bolts 6 and the peripheries of the nuts 7 are covered with such a thermosetting resin 8 as an epoxy resin to harden thereafter. That is, molding the thermosetting resin 8 into the peripheries of the heads 6a of the bolts 6 and the peripheries of the nuts 7, they are embedded in the hardened thermosetting resin 8. According to such structure preventing pulled out bolts 6, the thermosetting resin 8 prevents the bolts 6 from loosening, and in addition to this, even when someone intends to pull out the bolts 6, no spanner can be applied to the heads 6a of the bolts 6 and the nuts 7 to make impossible to pull out the bolts 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing a power transmission tower bolt from being pulled out artificially, which prevents a bolt connecting a leg of a main column member of a power transmission tower to a foundation side.

[0002]

2. Description of the Related Art In general, legs of main pillars of power transmission towers are connected to foundation-side steel columns embedded in foundation concrete with bolts. For example, when a steel pipe is used as the main pillar, the flanges welded and fixed to the respective end faces of the main pillar made of steel pipe and the base-side iron pole are fastened and fixed with a large number of bolts. Conventionally, bolts that perform these joints are usually provided with bolts to prevent loosening.
No special measures have been taken.

[0003]

Recently, an accident in which a tower of an existing transmission line collapsed occurred. The cause of the collapse was not merely an accident, but as described above, the leg of the main column of the transmission tower and the base side. It is considered possible that the bolts joining the steel columns were artificially removed. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a structure for preventing power tower bolts from being pulled out not only by simply preventing the bolts from being loosened but also by preventing them from being pulled out artificially. I do.

[0004]

According to the first aspect of the present invention, a leg of a main pillar of a power transmission tower and a foundation-side steel pole embedded in foundation concrete are joined by a plurality of bolts and nuts. In the power transmission tower, the periphery of the bolt head and / or the nut or both are covered with a thermosetting resin and are hardened.

According to a second aspect of the present invention, there is provided a power transmission tower in which a leg portion of a main pillar material of the power transmission tower and a foundation-side steel pole embedded in the foundation concrete are joined by a plurality of bolts and nuts.
The invention is characterized in that the periphery of the head and / or the nut of the bolt is covered with a thermoplastic resin and hardened.

A third aspect of the present invention relates to a power transmission tower in which a leg of a main pillar of the power transmission tower is connected to a foundation-side steel pole embedded in foundation concrete with a plurality of bolts and nuts.
The head and / or the nut of the bolt may be covered and hardened with a synthetic rubber material.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to the embodiment shown in FIG. 1 to 4
FIG. 1 shows an embodiment of the present invention. In FIG. 1, the legs of a main pillar 1 (one of four shown) of a power transmission tower are joined to a foundation-side steel pole 3 embedded in a foundation concrete 2. As shown in FIG. 3, the main pillar 1 and the foundation-side steel pole 3 of this embodiment are steel pipes, and the flanges 4 and 5 welded and fixed to the respective end faces of the main pillar 1 and the foundation-side steel pole 3 are composed of a large number of bolts. 6 and a nut 7. The nut 7 usually uses a double nut as shown.

According to the first aspect of the invention, the periphery of the head 6a and / or the nut 7 of the bolt 6 is covered with a thermosetting resin to be solidified. In this embodiment, as shown in detail in FIG. 4, the periphery of both the head 6a of the bolt 6 and the nut 7 is covered with a thermosetting resin 8 such as an epoxy resin, for example. 1 and 2, the thermosetting resin is indicated by a broken line. Here, to harden with thermosetting resin
It means that the thermosetting resin is molded around the head 6a and the nut 7 of the bolt 6 so that the head 6a and the nut 7 of the bolt 6 are embedded in the cured thermosetting resin.

According to the above-described structure for preventing removal, the thermosetting resin 8 not only prevents the bolt 6 from loosening but also attempts to remove the bolt 6 artificially.
Cannot be hung on the head 6a or the nut 7, and the bolt 6
Can not be actually extracted. Of course, it is not absolutely impossible, but it is extremely difficult to remove the thermosetting resin 8 from the head 6a of the bolt 6 and the periphery of the nut 7, so that there is an effect that the bolt cannot be actually removed. You can think about it.

According to a second aspect of the present invention, the thermosetting resin
Instead, a thermoplastic resin is used. That is, in the figure, it is the same as that described above, but the surroundings of the head 6a of the bolt 6 and the nut 7 are hardened with another thermoplastic resin such as polyester, polyethylene, and soft vinyl chloride. Here, in the case of the above-mentioned thermosetting resin or hard thermoplastic resin, for example, when a strong impact is applied by a hammer, the head tends to be broken and broken. It can be said that there are some elements that can be easily removed from the periphery of the bolt. However, in the case of a flexible thermoplastic resin such as soft vinyl chloride, it is less likely to be cracked by hitting. It is more difficult to remove from the periphery of the nut 7 to the extent that a spanner can be used, and it can be said that the effect of preventing the removal is higher.

According to a third aspect of the present invention, the thermosetting resin 8
A synthetic rubber material is used instead of the thermoplastic resin. That is, in the drawing, the same as the above, but the synthetic resin material such as silicon rubber used as a sealant material is used to cover and harden the periphery of the head 6a of the bolt 6 and the nut 7. In the case of synthetic rubber, since it is more flexible and elastic than a flexible thermoplastic resin, when it is hit with a hammer, it is less likely to be cracked by hitting, and it is even more difficult to remove it without leaving a wrench. It is difficult, and it can be said that the effect of preventing the removal is even higher. In addition, it is also possible to embed a wire net in this synthetic rubber. Thereby, it becomes more difficult to remove the synthetic rubber, and the effect of preventing the removal is further enhanced.

FIG. 5 shows another embodiment. This embodiment is
Recesses 11 and 12 are formed in the flanges 4 and 5 to accommodate the head 6a or the nut 7 of the bolt 6, and the open end faces of the head 6a or the nut 7 of the bolt 6 housed in the recesses 11 and 12 are heat-cured. It is covered and hardened with a thermoplastic resin, a thermoplastic resin, or a synthetic rubber material. With this structure, it becomes more difficult to remove the thermosetting resin and the like, and the effect of preventing the removal is enhanced.

FIGS. 6 to 8 show another embodiment of the present invention.
In this embodiment, the main pillar 1 'and the foundation-side steel pole 3' are angle irons. The main pillar 1 'and the foundation-side iron pole 3' are overlapped with each other by a predetermined length as shown in the figure, and are joined by a plurality of bolts 6 and nuts 7. Also in this case, the bolt 6 can be prevented from being pulled out by covering the head 6a of the bolt 6 and the periphery of the nut 7 with a thermosetting resin 8 'or a thermoplastic resin or a synthetic rubber material as shown in the figure. .

In the normal case, even if only one of the head 6a and the nut 7 of the bolt 6 is covered and hardened with the above-mentioned resin or rubber, the bolt 6 can be loosened by applying a spanner to the other. There is no effect of bolt removal prevention,
If there is some situation such as when the other side cannot be wrenched due to space, it is conceivable to cover and harden only one side with resin or rubber.

[0015]

According to the present invention, a thermosetting resin or a thermosetting resin is formed around a bolt head and / or a nut at a bolt joint between a leg of a main pillar of a power transmission tower and a foundation steel pole. Since the structure is covered with a plastic resin or a synthetic rubber material and hardened, not only can bolts be prevented from being loosened, but also artificial removal can be prevented.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a front view of the vicinity of a foundation of one main pillar in a power transmission tower.

FIG. 2 is an enlarged view of the vicinity of a bolt joint between a leg of a main column member and a foundation-side iron pole in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a schematic enlarged sectional view of a portion of FIG. 2;

FIG. 5 is a longitudinal sectional view showing another embodiment of the flange portion to be bolted in FIG. 4;

FIG. 6 shows another embodiment of the present invention, and is a front view near a bolt joint between a leg of a main pillar using angle iron and a foundation-side iron pole.

FIG. 7 is a right side view of FIG.

FIG. 8 is a sectional view taken along line BB of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main pillar material of power transmission tower 2 Foundation concrete 3 Foundation side iron pole 4,5 Flange 6 Bolt 6a Bolt head 7 Nut 8,8 'Thermosetting resin (thermoplastic resin, synthetic rubber material)

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[Procedure amendment]

[Submission date] April 9, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

According to the first aspect of the invention, the periphery of the head 6a and / or the nut 7 of the bolt 6 is covered with a thermosetting resin to be solidified. In this embodiment, as shown in detail in FIG. 4, the periphery of both the head 6a of the bolt 6 and the nut 7 is covered with a thermosetting resin 8 such as an epoxy resin, for example. 1 and 2, the thermosetting resin is indicated by a broken line. Here, to harden with thermosetting resin
This means that the thermosetting resin is molded around the head 6a and the nut 7 of the bolt 6 so that the head 6a and the nut 7 of the port 6 are buried in the cured thermosetting resin.

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

According to a second aspect of the present invention, the thermosetting resin
Instead, a thermoplastic resin is used. That is, in the figure, it is the same as that described above, but the head 6a of the bolt 6 and the periphery of the nut 7 are hardened with a thermoplastic resin such as polyester, polyethylene, or soft vinyl chloride. Here, in the case of the above-mentioned thermosetting resin or hard thermoplastic resin, for example, when a strong impact is applied with a hammer, the resin tends to be broken and broken. It can be said that there are some elements that can be easily removed from the periphery of the bolt. However, in the case of a flexible thermoplastic resin such as soft vinyl chloride, it is less likely to be cracked by hitting. It is more difficult to remove from the periphery of the nut 7 to the extent that a spanner can be used, and it can be said that the effect of preventing the removal is higher.

Claims (3)

[Claims] 1. A power transmission tower in which a leg of a main pillar of a power transmission tower and a foundation-side steel pole embedded in foundation concrete are joined with a plurality of bolts and nuts, around a head and / or a nut of the bolt. The power transmission tower bolts are prevented from being pulled out by solidifying with a thermosetting resin. 2. A transmission tower in which a leg of a main pillar of a transmission tower and a foundation-side steel pole embedded in foundation concrete are joined by a plurality of bolts and nuts, around a head and / or a nut of the bolt. The power transmission tower bolts are prevented from being pulled out by solidifying it with a thermoplastic resin. 3. A power transmission tower in which a leg of a main column material of the power transmission tower and a foundation-side steel pole embedded in foundation concrete are joined with a plurality of bolts and nuts, around a head and / or a nut of the bolt. The power transmission tower bolt is prevented from being pulled out by solidifying it with a synthetic rubber material.