JP3398090B2 - Steel pipe lid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel structure constructed by using steel pipes, such as a steel tower, in order to prevent rainwater from entering the steel pipes, bird nests or wind noises. The present invention relates to a steel pipe lid member to be mounted on.

[0002]

2. Description of the Related Art Conventionally, in steel structures such as power transmission or communication towers, steel pipes have been used as a main member because it is possible to secure sufficient strength while reducing weight.

In such a steel structure, the ends of the steel pipe are left open in many places, so that rainwater enters the steel pipe through the opening and corrodes the inside of the steel pipe. Or, there is a problem that birds nest in the steel pipe and the inside of the steel pipe is corroded by the excrement. In particular,
In steel towers near the coast, the rate of corrosion is rapid because wind and rain containing salt penetrates into the steel pipe, and deterioration of the steel structure due to such corrosion has been an important issue. Further, the sound (wind noise) generated when the wind blows through the steel pipe may be regarded as noise.

Therefore, recently, a rubber lid member is attached to the end of the steel pipe to close the opening, thereby preventing rainwater from entering the steel pipe, nesting of birds, or generation of wind noise. Is being attempted.

[0005]

However, the conventional lid member is formed in the shape of a column having a cross section slightly larger than the opening of the steel pipe, and this is simply press-fitted and adhered to the opening, so that the temperature changes. Due to this, when the air inside the steel pipe expands and the internal pressure rises, there is a problem that the lid member falls off from the steel pipe due to the pressure.

Therefore, it is possible to prevent the lid member from falling off due to a change in internal pressure of the steel pipe by increasing the thickness of the lid member (thickness in the press-fitting direction) and pressing the lid member into the steel pipe more and firmly. Although it is carried out, it causes an adverse effect that the mounting workability deteriorates rather than the increased thickness. Further, since the basic structure and the mounting method are the same as before except that the thickness is different, it is difficult to reliably prevent the lid member from falling off due to the change in the internal pressure of the steel pipe.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lid member for a steel pipe, which can prevent the steel pipe from falling off due to a change in internal pressure and is easy to install. There is.

[0008]

In order to solve the above-mentioned problems, the present invention is a lid member which is attached to a steel pipe constituting a steel structure and closes an end opening thereof, which is made of a resin material or non-water expansion. Made of a flexible rubber material so that it can be fitted and mounted in the opening, and a recess having a communication hole is formed on the surface that is the inside of the steel pipe when mounted in the opening, and the pin is formed in the recess. An inflating portion made of a water-expandable rubber material having a hole is provided, and the inside and outside of the steel pipe are configured to communicate with each other through the communication hole and the pin hole in a state of being attached to the opening. (Claim 1).

[0009] According to this lid member, it is possible to prevent rainwater and birds from entering the pipe or the generation of wind noise by mounting on the steel pipe. Further, the presence of the communication hole and the pinhole automatically adjusts the internal pressure of the steel pipe material to the atmospheric pressure, thereby preventing the lid member from falling off due to the increase of the internal pressure of the steel pipe material. In addition, when it rains, the expansion portion expands to contain moisture and thus the pinhole is closed, thereby preventing rainwater from entering the steel pipe through the communication hole. In addition, since the parts other than the inflatable part are made of a resin material or a non-water-expandable rubber material, it can be manufactured at low cost, and the lid member is lightened to improve the workability of mounting and the risk of falling. It is possible to reduce the sex.

[0010]

[0011]

[0012]

The lid member has a cross-sectional shape similar to that of the opening, and a projection portion around the opening, which is in pressure contact with the inner wall of the steel pipe when mounted on the steel pipe, and the opening. It is preferable to have a collar portion that comes into contact with the opening edge portion of (2). According to this structure, insertion resistance at the time of mounting on the steel pipe is reduced, and workability at the time of mounting is improved. In addition, after the mounting, the flange portion is brought into contact with the opening edge portion to completely close the opening portion.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

First, before describing the lid member according to the present invention, the application of the lid member will be described. The lid member is applied to, for example, a joint portion between steel pipes forming the steel tower 1 as shown in FIG. That is, in the steel tower 1, a gusset plate 2a is formed on a main steel pipe 2 serving as a main pillar as shown in the figure, and a reinforcing steel pipe 4 is joined to the gusset plate 2a. The plate 4a formed at the end portion of is fastened to the gusset plate 2a of the main steel pipe 2 with bolts and nuts 5. At this time, the plate 4a of the steel pipe 4 is formed by welding a steel plate to the end of the steel pipe 4 so as to divide the cross section thereof into two, so that the end of the steel pipe 4 has two half-moon shaped openings. 6
(See FIG. 1) are formed so as to sandwich the plate 4a.
That is, a large number of such openings 6 of the steel pipe 4 are present at the joints between the steel pipes forming the steel tower 1, and the lid member of the present invention is attached to the steel pipe 4 to close the openings 6. It is a thing.

FIG. 1 is a perspective view showing a lid member according to the present invention and an end portion of a steel pipe 4 to which the lid member is attached.

The lid member 10 is a steel pipe 4 as shown in this figure.
Is a plate-like member having a half-moon shape in plan view corresponding to the opening 6 formed at the end of the plate, and having a thickness of, for example, about 10 mm.
It is integrally formed of PDM (ethylene-propylene-diene rubber). The contour has a substantially similar shape that is slightly smaller than the shape of the opening 6, and the periphery of the contour abuts the edge of the opening 6 to prevent the lid member 10 from falling into the steel pipe. The collar 12 for doing is formed over the entire arc-shaped portion. Further, ribs 14 (protrusions) project from the arc-shaped portion of the lid member 10 that is on the front side of the flange 12, that is, the portion that is inserted into the steel pipe during mounting. As shown in FIG. 2, a projection 18 (projection) corresponding to the brim 12 is provided on the bottom surface in the width direction (direction orthogonal to the paper surface in FIG. 2).

The rib 14 is a lid member 10 in the illustrated example.
Is projectingly provided at the top, that is, the center of the arc-shaped portion.
The distance from the upper end of the rib 14 to the bottom surface of the protrusion 18 is formed to be slightly longer than the dimension from the plate 4a of the opening 6 to the top of the inner wall of the steel pipe 4 (center of the arc-shaped portion). Thus, when the lid member 10 is attached to the steel pipe 4, the ribs 14 and the protrusions 18 are pressed against the inner wall of the steel pipe to hold the lid member 10 inside the steel pipe 4.

Further, the lid member 10 is provided with an inflating portion 20 at the center thereof. In the expansion section 20, a pin hole 22 is formed which can communicate the inside and outside of the steel pipe 4 with the lid member 10 attached to the steel pipe 4, and the pin hole 22 opens and closes according to the weather, that is, the steel pipe 4 It is configured to be able to switch between a state in which the inside and the outside of the device communicate with each other and a state in which the communication is blocked. That is, the inflatable section 20 has the lid member 10
A disk-shaped member, which is made of a water-swellable material as described below and has a pinhole 22 with a diameter of about 2 mm, is attached to the circular recess 19 formed in It absorbs water and swells in high humidity such as rainy weather, thereby closing the pinhole 22 and releasing water in low humidity to maintain the original size. Is configured to open the pinhole 22. Then, when the pinhole 22 is opened, the pinhole 22 and the communication hole 19a formed at the bottom of the recess 19 communicate with each other to communicate the inside and outside of the steel pipe 4.

The material having a water-swelling property that constitutes the expansion section 20 is a mixture of a rubber polymer, a water-absorbing polymer, a surfactant, a filler, a vulcanizing agent (including a vulcanization accelerator) and other chemicals in a predetermined ratio. In this embodiment, EPDM is used as a rubber polymer, sodium acrylate polymer is used as a water-absorbing polymer, carbon black and silicates that are inorganic fillers are used as a filler, and sulfur is used as a vulcanizing agent. Using metal oxides and fatty acids, rubber polymer 38.3%, water absorbing polymer 38.3%, surfactant 7.6%, filler 12.6%, vulcanizing agent 2. 8%,
A rubber material containing other chemicals in a proportion of 0.4% is used.

Reference numeral 16 in FIG. 1 denotes a weld relief portion in which both ends in the width direction of the lid member 10 are obliquely cut, and when the lid member 10 is attached to the steel pipe 4, the steel pipe 4 and the plate 4a are separated from each other. A gap for allowing the welded portion to escape is formed, and thus the lid member 10 can be easily attached to the steel pipe 4.

In order to mount the lid member 10 having the above-mentioned structure on the steel pipe 4, first, the periphery of the lid member 10, specifically, the periphery of the lid member 10 other than the brim 12 and the protrusion 18 is provided. An adhesive or a sealant is applied to the portion, and the lid member 10 is arranged so that the direction of the lid member 10 is aligned with the opening 6 as shown in FIG.

While inserting the portion on the side opposite to the collar 12 into the opening 6, as shown in FIG. 2, the lid member 10 is attached to the steel pipe 4 until the collar 12 contacts the edge of the opening 6. Insert it at the end of. At this time, the lid member 10 is partially in pressure contact with the inner wall of the steel pipe and the plate 4a. Specifically, only the ribs 14 and the protrusions 18 are in pressure contact with the inner wall of the steel pipe, etc., of the entire circumference. The insertion resistance at the time of mounting is smaller than that in the case where the entire periphery of 10 is pressed against the inner wall of the steel pipe 4, etc. Therefore, the lid member 10 can be mounted on the steel pipe 4 extremely easily.

When the lid member 10 is attached to the steel pipe 4,
It is confirmed whether the gap between the steel pipe 4 and the lid member 10 is sufficiently filled with the adhesive or the sealant in the welding escape portion 16. If the gap is left, the adhesive or the sealant is filled to fill the gap. Fill in. This completes the mounting of the lid member 10 on the steel pipe 4, and the opening 6 of the steel pipe 4 is closed.
It is blocked by 0.

If the lid member 10 as described above is attached to the steel pipe 4 to close the opening 6, rainwater can be prevented from entering through the opening 6 and the inside of the steel pipe 4 can be prevented. It can effectively prevent birds from entering and nesting in. Further, since it is possible to suppress the passage of wind in the steel pipe 4, it is possible to effectively prevent the generation of wind noise.

In addition, the lid member 10 is provided with a pin hole 22 so that the inside and outside of the steel pipe 4 are kept in communication with each other in a weather with low humidity so that the pressure inside the pipe is automatically adjusted to atmospheric pressure. As described above, the internal pressure of the steel pipe 4 rises as in the conventional lid member of this type, and the lid member 10
Does not fall off the steel pipe 4. In addition, under high-humidity conditions such as rainy weather, as described above, the expansion section 20
Since the pinhole 22 is closed by containing water and expanding, it is possible to reliably prevent rainwater and the like from entering the steel pipe 4 through the pinhole 22. And
When the weather is further recovered, the expansion section 20 releases water and returns to the original size, so that the pinhole 22 is opened again, whereby the pressure inside the steel pipe 4 is automatically adjusted.

Therefore, according to the lid member 10, it is possible to reliably prevent the intrusion of rainwater, the nesting of birds and the generation of wind noise, while the lid member 10 is caused by the change in the internal pressure of the steel pipe 4. It is possible to effectively prevent the member 10 from falling off.

Further, since the lid member 10 is prevented from falling off by automatically adjusting the internal pressure of the steel pipe 4, the thickness of the lid member 10 is set to about 10 mm and the ribs 14 are formed as described above. Also, the lid member 10 is sufficiently held by the steel pipe 4 even if the lid member 10 is mounted while the lid member 10 is partially supported by the protrusions 18. Therefore, as compared with the conventional lid member of this type in which the thickness is set thick to prevent the steel pipe from falling off and the lid member is firmly fitted into the opening, the lid member 1 is much easier.
0 can be attached to the steel pipe 4. In particular, the steel pipe 4
Since it is fastened to the main steel pipe 2 by the bolt nut 5 via the plate 4a, if the lid member is thick as in the conventional case, the bolt nut 5 becomes an obstacle and the mounting work of the lid member becomes difficult. According to the lid member 10, since the thickness can be set thin as described above, the work of mounting the steel pipe 4 does not become difficult due to the presence of the bolt and nut.

Therefore, according to the lid member 10, the steel pipe 4
It is possible to easily and quickly attach the lid member 10 to the steel pipe 4 while effectively preventing the falling off from the steel pipe 4 as described above.

By the way, the lid member 10 described above is one embodiment of the lid member according to the present invention, and its specific configuration can be appropriately changed without departing from the gist of the present invention. .

For example, the lid member 10 (excluding the inflating portion 20)
Can be made of a material other than the rubber material (EPDM), for example, a resin material, a metal subjected to anticorrosion treatment, or the like. However, if metal is used, the weight of the lid member is likely to increase and the workability at the time of mounting may be reduced, and there is also a risk of falling, so the lid member 10 is made of a lightweight rubber material or resin material. Is desirable.

The water-swellable material forming the expansion section 20 is not limited to that of the above-mentioned embodiment, and can be selected appropriately. That is, the kind of the compounding material of the water-swelling material and the compounding ratio thereof are not limited to those in the above-mentioned embodiment, and can be appropriately selected. For example, in the above embodiment, EPDM, which is a kind of soft rubber, is used as the rubber polymer,
The same soft rubber such as natural rubber, CR (chloroprene rubber), IIR (butyl rubber), SBR (styrene butadiene rubber), or silicone rubber may be used. Instead of these rubber materials, for example, silicone resin,
Resins such as urethane resin, acrylic resin, vinyl chloride resin, EVA (ethylene-vinyl acetate copolymer) may be used. Further, although the sodium acrylate polymer is used as the water-absorbing polymer in the above embodiment, a vinyl acrylate vinyl alcohol copolymer or the like may be used.

Further, the specific shape of the lid member 10 may be selected according to the specific shape of the opening 6 of the steel pipe 4. For example, when the steel pipe 4 is provided with a cross-shaped plate 4a and each opening 6 is formed in a fan shape, the lid member 10 may be formed in a fan shape in plan view, and the opening 6 is rectangular. If so, the lid member 10 may be formed in a rectangular shape in a plan view accordingly. Further, although only one rib 14 is provided in the above-described embodiment, a plurality of ribs may be provided in an arcuate portion, and instead of the protrusion 18, ribs may be provided on the lower surface of the lid member 10. You may make it provide 14. Further, the collar 12, the ribs 14, the protrusions 18 and the like may be omitted, and the lid member 10 may be press-fitted into the opening 6 to be mounted. According to this, since the shape of the lid member 10 is simplified, there is an advantage that the manufacturability of the lid member 10 is improved. However, as in the above embodiment, the rib 14
If the protrusions 18 are provided, the workability at the time of mounting is improved as described above, and in addition to the ribs 14 and the protrusions 18 and the inner wall surface of the steel pipe 4 around the lid member 10. Since a gap is formed between them and this portion is sufficiently filled with the adhesive or the like, there is an advantage that the lid member 10 and the steel pipe 4 are favorably adhered.

Further, in the above embodiment, only one pinhole 22 having a diameter of about 2 mm is provided in the expansion portion 20, but the number and diameter of the pinholes 22 can be adjusted so that the internal pressure of the steel pipe 4 can be adjusted well. The pinhole 22 may be appropriately set so that the pinhole 22 can be closed with the expansion of the expansion part 20 in the rain and the like.

[0035]

[0036]

As described above, the lid member of the present invention can effectively prevent the birds from entering the pipe or the generation of wind noise by being fitted and attached to the steel pipe. Moreover,
Since an expansion part made of a water-expandable rubber material having a pinhole capable of communicating the inside and outside of the steel pipe is provided in a part of it,
It is possible to effectively prevent the lid member from falling off even when the pressure inside the steel pipe rises due to temperature rise, such as during fine weather.
In rainy weather or the like, since the pinhole is closed as the expansion portion expands, rainwater can be reliably prevented from entering the steel pipe.

Further, since the internal pressure of the steel pipe is automatically adjusted through the communication hole and the pin hole, it is necessary to have a structure in which the lid member is press-fitted firmly into the opening like the conventional lid member of this type. Absent. Therefore, it is possible to provide a structure in which the lid member can be easily mounted, and thereby the mounting work to the steel pipe can be performed easily and quickly.

Further, since the parts other than the expansion part are made of a resin material or a non-water-expansion rubber material, the weight of the lid member can be reduced, the mounting workability can be improved, and the risk of dropping can be increased. Can be reduced.

Further, the lid member has a cross-sectional shape similar to that of the above-mentioned opening, and the periphery of the lid member is pressed against the inner wall of the steel pipe while being pressed against the opening edge of the opening. By providing the brim portion which is in contact with the steel pipe, the insertion resistance at the time of mounting on the steel pipe can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lid member according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a state in which the lid member according to the present invention is attached to a steel pipe.

FIG. 3 is a view showing an iron tower to which the lid member of the present invention is applied.

[Explanation of symbols]

1 steel tower 4 steel pipe 4a plate 6 openings 10 Lid member 12 brims 14 ribs 20 Expansion part 22 pinholes

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Momoi 4-17 Minamijima-cho, Sakai City, Osaka Kyokuto Rubber Co., Ltd. (56) References JP-A-9-119235 (JP, A) −34806 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 1/19 E04B 1/62 E04C 3/00 E04H 12/00

Claims (2)

(57) [Claims] 1. A lid member that is attached to a steel pipe constituting a steel structure to close an end opening thereof, which is made of a resin material or non-water expansion material.
Consists tonicity of rubber material is formed to fit mountable to the opening Rutotomoni, Contact the mounted state into the opening
The inner surface of the steel pipe has a recess with a communication hole.
Water-swellable rubber material with pinholes in this recess
The expansion part consisting of is installed in the opening.
In the state, through the communication hole and the pin hole
A steel pipe lid member, which is configured to communicate with each other . 2. The lid member has a shape similar to that of the opening.
It has a cross-sectional shape and the steel pipe
And the protrusion that presses against the inner wall of the steel pipe when mounted on the
The lid member for a steel pipe according to claim 1, further comprising a collar portion that abuts an opening edge portion of the opening portion .