JP2002180537A - Sealed construction for open end portion of pipe structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed construction for an open end portion which does not require a complicated work control different from the case of using an adhesive, is not governed by working environment such as weather or work at a high place, permits simple attachment or detachment, and being capable of stably maintaining airtightness over a long period of time while offering low-cost and simple configuration. SOLUTION: A joint plate 6 is fixed by welding in a state of fitting to a slotted portion formed at each end portion of a diagonal member 4 of a steel tower. To an almost semi-circular-shaped opening divided by a front surface 6b and a rear surface 6c of the joint plate 6 and an inner wall surface, an inner side plate 14 and an elastic plate 13 are inserted, and an outer side plate 12 comes into contact with the end edge of the opening. A tightening bolt 11 is sequentially inserted to both the through- holes of the outer side plate 12 and the elastic plate 13, a male threaded portion of the tightening bolt 11 is screwed to the female threaded portion of the inner side plate 14, the elastic plate 13 is compressed by strongly tightening the tightening bolt 11, the volume is moved in a radial direction and tightly adhered to the inner surface of the diagonal member 4 and the opening is sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open end of a pipe structure, for example, a pipe material for connecting a frame member of a steel pipe truss structure such as a power transmission / communication tower or a bridge, to a joint end of a joint. The present invention relates to an opening end sealing structure suitable for sealing an opened portion.

[0002]

2. Description of the Related Art In order to construct a power transmission / communication tower or bridge, it is common to connect a large number of pipes, for example, steel pipes, to assemble an object. The configuration of a power transmission / communication tower will be described with reference to FIG. 8. A main pillar 2 is erected on a concrete foundation member 1 built on solid ground in the ground.
The main pillar 2 is reinforced by a horizontal member 3 called a web member and a plurality of diagonal members 4. Of these, each end of the horizontal member 3 made of a tubular member is connected to a gusset plate 5 fixed to each inner side of the main column member 2 via a joint plate 6 with bolts and bolts.
One end of a diagonal member 4, which is connected by a nut and is also made of a tubular material, is connected to a gusset plate 5 fixed to each inner side of the main pillar 2 by a bolt and nut via a joint plate 6. Is connected to a relay plate 7 provided in the middle of the pair of main pillars 2 by bolts and nuts via a joint plate 6. Since the steel pipe member for a steel tower to which the above-described joint plate 6 is attached needs to be subjected to a hot-dip plating process, the ends of the steel pipes as the horizontal member 3 and the diagonal member 4 are in an open state. After construction of the tower, there are problems such as birds entering the steel pipe to form a nest, and whistling noise caused by wind.

[0003] In order to solve these problems, various devices for closing the opening of a steel pipe have been proposed. As a first conventional example, Japanese Patent Application Laid-Open No. Hei 9-119235 discloses that an opening formed at a joint end of a joint plate for joining a frame member of a steel pipe structure has a thickness slightly larger than the inner diameter of the opening from the joint end side. An open end sealing structure in which an elastic body such as meat rubber or the like is press-fitted and fitted tightly is proposed. In addition, as a second conventional example, a plate-shaped joint plate that protrudes in the axial direction from both end openings of a steel pipe and divides the opening linearly, is surrounded by the front and back surfaces of the joint plate and the inner peripheral edge of the steel pipe. In the closed structure at the end of the steel pipe, which has a lid for individually covering the mouth portions in an airtight state, the lid is made of a material easily elastically deformable such as rubber, for example, ethylene propylene terpolymer (EPT rubber) or vinyl chloride. An open end sealing structure is proposed which is formed of an elastic synthetic resin such as that described above, an adhesive is applied to the lid to ensure adhesive force and airtightness, and the external end is extrapolated to the edge of the steel pipe.

[0004]

However, in the case of the sealing method based on the reaction force of the elastic body itself generated when the elastic member such as rubber is pressed into the end of the steel pipe, as in the first conventional example, the elasticity is low. Since the ends of the body are not restrained, the reaction force generated when the elastic body is inserted into the steel pipe deforms so as to escape to both ends with the passage of time, and the reaction force decreases due to stress relaxation. The long-term sealing force is lost, and even the lid may fall off. Further, in the case of the method of bonding the elastic body to the end of the steel pipe with an adhesive as in the second conventional example, the problem of the first method is almost eliminated, but the pre-bonding treatment is troublesome. Yes, work management such as adhesive concentration, adhesive application method, etc. is necessary, and even in the work environment, outdoor work is mostly done, so it is greatly affected by the weather at the time of work, making it difficult to work at high places In addition, there is a problem that necessary inspections and the like cannot be performed because the attachment or detachment of the elastic lid is impossible or difficult.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to eliminate the need for complicated work management such as the case of using an adhesive, and work environment such as weather and work at a high place. It is easy to attach and detach easily without being affected by
It is possible to provide a closed structure for an open end of a tubular structure that can maintain airtightness stably for a long period of time while having a simple configuration at a low cost.

[0005]

According to a first aspect of the present invention, there is provided an opening end sealing structure for closing an opening end of a pipe material constituting a pipe structure, in order to achieve the above object.
The volume of the elastic member is moved toward the inner surface of the opening of the tube by compressing the elastic member having airtightness inserted into the opening while sandwiching the elastic member between the first hard member and the second hard member. In this case, the opening end can be sealed. According to a second aspect of the present invention, there is provided an opening end sealing structure for sealing an opening end of a pipe material constituting a pipe structure, wherein the tightening bolt and the tightening bolt are inserted. A first hard member in the form of a flat plate, which comes into contact with the opening end, and a through hole, through which the tightening bolt is inserted, are loosely fitted into the opening. A thick flat plate-shaped elastic member having an outer shape to be obtained and a female screw portion to be screwed with a male screw portion of the tightening bolt are attached, and a flat second shape having an outer shape capable of loosely fitting into the opening is provided. 2 hard members,
In the state where the elastic member is sandwiched between the first hard member and the second hard member, the elastic member is compressed by tightening the tightening bolt, and the inner surface of the opening of the tubular member is provided. The volume of the elastic member is moved toward the opening so that the opening end can be sealed.

According to the third aspect of the present invention, the second hard member and the elastic member protrude in the axial direction from an opening of a pipe constituting a power transmission / communication tower or bridge, and divide the opening into two or four parts. It has a shape that can be loosely fitted into the open end defined by the front and back surfaces of the plate-shaped joint plate to be divided or two surfaces orthogonal to each other and the inner periphery of the pipe material, and the first hard member contacts the open end surface. It is characterized by exhibiting a shape that can be touched. According to a fourth aspect of the present invention, the elastic member is made of an elastic body having a crosslinked molecular structure. According to a fifth aspect of the present invention, the elastic member is an elastic body made of an ethylene-propylene copolymer rubber.
According to a sixth aspect of the present invention, the elastic member is made of silicone rubber. The elastic body in the invention according to claim 7 is characterized in that the crosslinking treatment is performed by peroxide crosslinking.

[0007] In the invention according to claim 8, the elastic body has a volume resistivity value of 10 ⁵ Ωcm or more. According to the ninth aspect of the present invention, the elastic body is 5 to 60 degrees (JIS K6301 JI).
(SA standard). The elastic body according to claim 10, wherein the elastic body has a thickness of 15 mm to 30 mm, and a gap of 1 mm to 3 mm between its outer periphery and the inner periphery of the tube in a natural state inserted into the tube. Is formed in a size having the following.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a closed structure at an open end of a pipe structure according to the present invention will be described in detail. Figure 1
FIG. 5 relates to the first embodiment of the present invention,
FIG. 1 is a perspective view showing an external appearance configuration of an assembled state of an open end sealing structure of a pipe structure, and FIG. 2 is a fastening bolt and a first bolt forming the open end sealing structure of FIG. FIG. 3 is an exploded perspective view showing an outer plate as a hard member, an elastic plate as an elastic member, and an inner plate as a second hard member, and FIGS. 3 and 4 show an open end according to the present invention. FIG. 5 is a half sectional view showing a process of attaching a closed structure to an end of a horizontal member or a diagonal member, which is one of reinforcing members constituting a steel tower. FIG. Alternatively, it is a left side view (a) showing a state of being attached to a substantially semicircular opening end formed by a diagonal member and a joint plate, and a sectional view taken along line XX of FIG. Figure 1
In FIG. 5, reference numeral 11 denotes a tightening bolt, more specifically, a flat plate bolt having a conical surface at the neck, a hexagonal wrench hole formed at the head, and a male screw portion 11a formed under the neck. I have.

Reference numeral 12 denotes an outer plate as a first hard member, which is made of various metal materials, for example, mild steel, stainless steel, aluminum alloy, etc., and has a constant thickness. At the end of the arc portion, a cut-off portion 12a is formed at a central portion to escape a swelling of welding when a joint plate described later is connected and fixed to an end of the horizontal member 3 or the diagonal member 4. Has an axial center in the thickness direction, is formed with a conical counterbore groove into which the dish portion of the tightening bolt 11 is fitted, and has a through hole 12b through which the male screw portion 11a is loosely inserted. Reference numeral 13 denotes an elastic plate as an elastic member, which is made of, for example, an elastic member such as silicone rubber or ethylene-propylene copolymer rubber, which will be described in detail later, and is a flat plate having a predetermined thickness. 1, and more specifically, formed at the end of the above-mentioned cylindrical horizontal member 3 or diagonal member 4 (hereinafter, the diagonal member 4 will be described as a representative of the tubular member) in FIG. And has a shape that can be loosely fitted into a substantially semicircular opening end defined by the front and back surfaces of the joint plate 6 and the inner periphery of the diagonal member 4 which are welded in a state inserted into the split portion 4a. A through hole 13a having an axial center in the thickness direction and through which the male screw portion 11a of the tightening bolt 11 is loosely inserted is formed.

Reference numeral 14 denotes an inner plate as a second hard member, which is made of the same material as that of the outer plate 12 and has a constant thickness, and has a planar shape similar to that of the elastic plate 13. The semi-circular opening end defined by the front and back of the joint plate 6 inserted and welded into the end of the horizontal member 3 or the inclined member 4 and the inner peripheral wall of the horizontal member 3 or the inclined member 4. It has a shape that can be loosely fitted, and has a male screw 1
A female screw portion 14a to be screwed with 1a is formed. A method of processing and assembling the open end closed structure of the pipe structure according to the present invention having such a configuration will be described. First,
Here, as an example, the sealing structure of the open end of the diagonal member 4 of the tower shown in FIG. 10 will be described. A sliding process is performed in which a half portion of the joint plate 6 is inserted and a sliding process is performed.
a is formed. The width of the joint plate 6 on the bent end side is slightly larger than the diameter of the diagonal member 4.

The bent end side of the joint plate 6 is inserted into the sliding portion 4a of the pipe member 4, and the contact portion between the sliding portion 4a of the diagonal member 4 and the joint plate 6 is fixed by welding (see FIG. 5). .
Reference numeral 8 denotes a raised portion formed by this welding.

The joint plate 6 includes a gusset plate 5
Alternatively, a plurality of (three in this example) bolt mounting holes are drilled in which the positional relationship and the size of the bolt holes (not shown) formed in the relay plate 7 match. Thus, the surface 6b of the plate-like joint plate 6 projecting in the axial direction from the opening of the diagonal member 4 made of a steel pipe and dividing the opening into two.
An opening defined by the back surface 6c and the inner periphery of the diagonal member 4, that is, a substantially semicircular opening is open.
Before the insertion, the fastening bolt 11 is inserted into the substantially semicircular opening in a state where the outer plate 12, the elastic plate 13, and the inner plate 14 are overlapped with each other through a through hole 12 b formed in the outer plate 12. Then, the hermetically sealed unit is assembled by sequentially inserting the male screw portion 11a into the through hole 13a formed in the elastic plate 13 and screwing the male screw portion 11a to the female screw portion 14a formed in the inner plate 14 so as not to be strongly tightened.

Next, the closed structural unit assembled as described above is inserted into the substantially semicircular opening formed at the end of the structural member including the above-described diagonal member 4 and the joint plate 6, and the inner plate 14 The elastic plate 13 is inserted, and the outer plate 12 abuts on the substantially semicircular opening edge of the diagonal member 4 (FIG. 3). In this state, a separately prepared hexagon wrench (not shown) is inserted (engaged) into the hexagon wrench hole in the head of the tightening bolt 11, and if the male screw portion 11a and the female screw portion 14a are right-handed screws. If you use a hex wrench clockwise (clockwise)
The inner plate 14 is drawn toward the outer plate 12 by the screw action of the tightening bolt 11, and the elastic plate 13 interposed therebetween is gradually compressed in the axial direction of the diagonal member 4, and the thickness thereof is increased. Decreases, but instead the volume moves in the radial direction (radial direction), bulging in the radial direction,
It tightly adheres to the inner peripheral wall surface of the inserted diagonal member 4, and an airtight state is realized (FIG. 4).

Similarly, another set of the inner plate 14 and the elastic plate 13 are inserted into another substantially semicircular end opening formed at the end of the structure including the diagonal member 4 and the joint plate 6. , The outer plate 12 is brought into contact with the substantially semicircular opening edge of the oblique member 4, and the tightening bolt 11 is
, The elastic plate 13 bulges radially, and seals the other half of the open end. Further, the other end of the diagonal member 4 can be similarly sealed by two sets of opening end sealing structures. In this way,
The fitting portion of the joint plate 6 and the diagonal member 4 are tightly joined by welding, and the open ends on both sides defined by the inner peripheral surface of the diagonal member 4 and the front surface 6b and the back surface 6c of the joint plate 6 Since the outer plate 12 and the inner plate 14 are sealed by the elastic plate 13 which swells in the radial direction by being squeezed between the outer plate 12 and the inner plate 14, the open end of the diagonal member 4 is completely closed and a bird enters and forms a nest. However, since the intrusion of rainwater and the intrusion of outside air (oxygen) are surely shut off, the elastic plate 13 is hardly deteriorated. One end of the diagonal member 4 whose openings at both ends are completely sealed is connected to a gusset plate 5 fixed inside the main column member 2, and the other end is connected to a relay plate 7.

That is, a flat gusset plate 5 is inserted into a gap 6d formed at a constant interval formed in a U-shape of a joint plate 6 fixed to the tip of the diagonal member 4, and the gusset plate 5 is pierced. Align the provided bolt mounting hole (not shown) with the bolt mounting hole 6a drilled in the joint plate 6, insert the mounting bolt 15 into it, screw a nut to the tip, and tighten tightly. Thereby, the diagonal member 4 is firmly connected to the gusset plate 5. Also,
The joint plate 6 fixed to the other end of the diagonal member 4 is fixed and connected to the relay plate 7 in a similar manner. Both ends of the horizontal plate 3 are also fixed and connected to the gusset plate 5 fixed to the inside of the main pillar 2 in the same manner via the joint plate 6 respectively. According to the first embodiment configured as described above, both surfaces (upper and lower surfaces or left and right surfaces) of the elastic plate 13 having airtightness, incompressibility, elasticity, and the like are formed of the hard outer plate 12 made of a metal material. And the inner plate 14 in a sandwich shape, and inserted into an opening defined by the inner peripheral surface of the diagonal member 4 as a cylindrical body and the front surface 6b and the back surface 6c of the joint plate 6 to compress the tightening bolts 11 and the like. Means to deform the elastic plate 13,
In addition, the inner plate 14 having a moderate gap causes the volume of the elastic plate 13 to flow within the opening.
Since the sealing stress (sealing force) is increased by constraining by the outer plate 12 and the outer plate 12, the openings at both ends of the diagonal member 4 and the horizontal member 3 can be semi-permanently sealed.

Further, this sealing structure can be quickly mounted on the end opening of the pipe structure by a simple operation of simply tightening the tightening bolt 11, and the elastic body is bonded with an adhesive as in the prior art. This eliminates the need for cumbersome work management as in the case described above, allows easy installation even in bad working environments such as when working in rainy weather or outdoors, and, unlike the bonding method, furthermore, unlike the bonding method, the diagonal member 4 and the horizontal member 3 Even if it becomes necessary to inspect the inside of the device, the closed structure at the open end can be removed by a simple operation of simply loosening the tightening bolt 11, and this is also significantly more convenient than the bonding method. The elastic member (elastic plate) which has the greatest effect on the operation and effect of the present invention among the elements constituting the present invention will be described more specifically. First, the hardness of the elastic member is 5 to 60 degrees (however, JI
(SK6301 in JIS A standard) can be used. If the hardness of the elastic member is less than 5 degrees,
Although a large amount of deformation can be obtained with a small torque, the elastic plate 13 gradually deforms and moves into a gap formed between the inner plate 14 and the diagonal member 4 to reduce stress, resulting in a decrease in airtightness. Therefore, the desired airtightness cannot be obtained.

On the other hand, when the hardness of the elastic plate 13 is 6
If the angle exceeds 0 degrees, only a small amount of deformation can be obtained even if the tightening bolt 11 is tightened with a large torque, so that the desired airtightness cannot be realized. Therefore, when tightening the tightening bolt 11 and compressing and deforming the elastic plate 13, in order to give a large amount of deformation with a small torque and to improve the airtightness, the hardness of the elastic member must be 20 JIS standard.
A hardness of from 40 degrees to 40 degrees (JIS K6301 JIS A standard) is preferable. In the present embodiment, the case of 30 degrees is described. Second, the elastic plate 13
As for the thickness of the test piece, as a result of various experiments, 10 mm to 60 mm
Can be used, and the outer dimensions of the elastic plate 13 vary depending on the size of the pipe material (steel pipe) to be inserted. However, there may be a gap of 0.5 mm to 5 mm around the inside of the pipe material, Force product weight, compression amount, workability,
The thickness is 15mm considering the airtightness, cost, etc.
The gap between the inner circumference of the pipe (steel pipe) and the outer circumference of the elastic plate 13 is more preferably 1 mm to 3 mm.

Third, as a material of the elastic plate 13, natural rubber (NR), styrene-butadiene copolymer rubber (SBR), butadiene rubber (BR), polyisoprene rubber (IR), chloroprene rubber (CR) , Acrylonitrile-bradiene copolymer rubber (NBR, NI
R, NBIR, and other diene rubbers), butyl rubber (II
R), ethylene-propylene copolymer rubber (EPD)
M), silicone rubber (Si), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), acrylic rubber (ACM, ANM), polysulfide rubber (OT, B
Non-diene rubbers such as OT), EPDM blended with other rubbers, and the like can be used. Of these, by using an elastic body having a cross-linked molecular structure as the elastic plate 13, the elastic body is gradually deformed and moved to a gap formed between the steel pipe for use in a compressed state for a long time. The so-called creep phenomenon can be prevented to prevent a decrease in stress relaxation, and airtightness during long-term use can be maintained. Further, by using an ethylene-propylene copolymer rubber (EPDM) or a silicone rubber material as the elastic plate 13, an airtight structure having excellent heat resistance, cold resistance, acid resistance, seawater resistance and weather resistance can be obtained. it can.

Further, the cross-linking treatment of the above-mentioned ethylene-propylene copolymer rubber is carried out by peroxide cross-linking while avoiding the use of a commonly used cross-linking agent (sulfur), so that the elastic body and the steel pipe can be crosslinked. Metal corrosion due to residual sulfur can be prevented at the contact surface. Further, by using an elastic member having a volume resistivity value of 10 ⁵ Ωcm or more, even if the above-mentioned open end airtight structure is used for a long time in a state of being mounted inside the steel tube, contact between the elastic member and the steel tube is possible. Corrosion due to a potential difference on the surface, that is, so-called electrolytic corrosion can be prevented. In addition to the use of the elastic member having the above excellent properties, the present invention provides an elastic member which is sandwiched between the first and second hard members, inserted into a diagonal member (steel pipe) and sealed in a compressed state. Since the members are protected from the outside air by the hard members and the steel pipes at both ends, except for the influence of stress and temperature, there are few external factors of environmental degradation, so that the members maintain a semi-permanent sealing function.

Next, a closed structure of an open end of a pipe structure according to a second embodiment of the present invention will be described in detail with reference to FIGS. The second embodiment is different from the first embodiment in that the joint plate has a single-letter shape, whereas the joint plate has a cross-letter shape. That is, the shape of the joint plate 20 as viewed from the side orthogonal to the longitudinal direction (axial direction) has a cross shape. For example, the center of a wide plate having a width somewhat larger than the diameter of the diagonal member 4 made of a steel pipe. A narrow plate having approximately half the width of a flat plate is joined to the portion by welding or the like to form a cross shape. This joint plate 20
Is welded along the sliding portion 4b in a state in which approximately half is fitted to the sliding portion 4b formed at 90 ° intervals at the four end portions of the diagonal member 4 so that the diagonal member 4 is firmly connected to the slanting member 4. And it is tightly joined.
In this manner, the two orthogonal surfaces 20a and 20b of the cross-shaped joint plate 20 projecting along the axial direction from the opening of the diagonal member 4 as a tube material and dividing the opening into four, and within one-fourth of the diagonal member 4 The open end sealing structure according to the second embodiment of the present invention is attached to the fan-shaped open end defined by the peripheral surface.

That is, also in this embodiment, the basic structure of the closed structure is the same as that of the first embodiment, but as described above, it is formed by the opening of the diagonal member 4 and the joint plate 20. The shape differs from the shape of the fan-shaped opening end face. The outer plate 22, which is a first hard member, has a shape that abuts against and closes the edge of the fan-shaped opening, and the elastic plate 23, which is an elastic member, has a shape that fits loosely into the fan-shaped opening. The inner plate 24, which is a second hard member, has substantially the same surface shape as the elastic plate 23.
However, regarding the thickness of each of the plates 22 to 24, for example, the outer plate 22 and the inner plate 24
Elastic plate 2 which is strongly tightened by 1
3 is compressed, and the volume of the elastic plate 23 moves in a radial direction perpendicular to the compression direction, that is, expands, and requires a wall thickness having a sufficient bending strength to make necessary adhesion. Further, the hardness, thickness, material, volume resistivity and the like of the elastic plate 23 are the same as those in the above-described first embodiment, and thus redundant description will be omitted.

Also in the second embodiment, the tightening bolt 21 is a flat-head bolt having a hexagonal wrench hole in the head and a conical neck, and a male screw 21a below the neck. . The outer plate 22 is similar in material and thickness to the outer plate 12 described above, but has a substantially fan-shaped planar shape, and is provided with cut-out portions 22a at the corners of the fan and at both ends of the fan. , 22c are formed to escape the raised portion 28 formed by welding at the joint between the diagonal member 4 and the joint plate 20. In the center of the outer plate 22, a through hole 22b through which the tightening bolt 21 can be loosely inserted is formed. A similar through-hole 23a and a cut-out portion 23b are also formed in the elastic plate 23, and a cut-out portion 24b is formed in the inner plate 24. The center portion of the elastic plate 23 is screwed with the male screw portion 21a of the tightening bolt 21. A female screw portion 24 is formed.

The processing and assembling method of the open end sealing structure according to the second embodiment having the above-described structure is described in the first embodiment.
This is substantially the same as the embodiment. First, the joining between the oblique member 4 and the joint plate 20 is as described above. An opening which projects in the axial direction from the opening of the diagonal member 4 and is defined by two mutually orthogonal surfaces 20a and 20b of the cross-shaped joint plate 20 which divides the opening into four, and an inner periphery of the diagonal member 4, that is, a substantially fan. Before insertion, the fastening bolt 21 is inserted into the opening of the shape with the outer plate 22, the elastic plate 23, and the inner plate 24 overlapped with each other, and the through-hole 22 b formed in the outer plate 22 and the elastic plate 23 are inserted. The hermetically sealed unit is assembled by sequentially inserting the male screw portion 21a into the female screw portion 24a formed in the inner plate 24 and sequentially inserting the male screw portion 21a into the through hole 23a formed in the inner plate 24. Then, the inner plate 24 and the elastic plate 23 are placed in the substantially fan-shaped opening formed at the end of the structural material including the diagonal member 4 and the joint plate 20 described above. And the outer plate 22 is brought into contact with the substantially fan-shaped opening edge of the diagonal member 4 (FIG. 8).

Thereafter, the operation until the tightening bolt 21 is strongly tightened and the elastic plate 23 is compressed to obtain an airtight state (FIG. 9) is the same as that in the first embodiment described above. , Overlapping description will be omitted. In this manner, four closed structure units are mounted on one end side of the diagonal member 4, and mounting operations are performed on the remaining three units in the same procedure. Also, four pieces are mounted on the other end of the diagonal member 4. One end of the diagonal member 4 whose openings at both ends are completely sealed is connected to a gusset plate 5 fixed inside the main column member 2, and the other end is connected to a relay plate 7. That is, the end of the cross-shaped joint plate 20 fixed to the tip of the diagonal member 4 is overlapped with the gusset plate 5, and a bolt mounting hole (not shown) formed in the gusset plate 5 and its own bolt mounting hole 25, and a mounting bolt 26 is inserted into the bolt mounting hole 25 or the like, and a nut 27 is screwed into the distal end side to be strongly tightened.

The joint plate 20 fixed to the other end of the diagonal member 4 is connected to the relay plate 7 in the same manner.
Both ends of the horizontal plate 3 are also fixed and connected to the gusset plate 5 fixed to the inner side of the main pillar 2 in the same manner via the joint plates 20, respectively. According to the second embodiment configured as described above, both sides (upper and lower surfaces or left and right surfaces) of the elastic plate 23 having airtightness, incompressibility and elasticity are made of the hard outer plate 2 made of a metal material.
2 and the inner plate 24 in a sandwich shape, and inserted into an opening defined by the inner peripheral surface of the diagonal member 4 which is a cylindrical body and two orthogonal surfaces 20a and 20b of the joint plate 20, and tightened by tightening bolts 21. The elastic plate 23 is deformed to cause a volume shift by compressing the elastic plate 23, and the flow of the elastic plate 23 in the opening is restrained by the inner plate 24 and the outer plate 22 having an appropriate gap. To increase the sealing stress (sealing force),
The openings at both ends of the diagonal member 4 and the horizontal member 3 can be sealed semi-permanently.

Further, this sealing structure can be quickly mounted on the end opening of the pipe structure by a simple operation of simply tightening the tightening bolt 21, and the elastic body is bonded with an adhesive as in the conventional case. This eliminates the need for cumbersome work management as in the case described above, allows easy installation even in bad working environments such as when working in rainy weather or outdoors, and, unlike the bonding method, furthermore, unlike the bonding method, the diagonal member 4 and the horizontal member 3 Even if it becomes necessary to inspect the inside of the device, the closed structure at the open end can be removed by a simple operation of simply loosening the tightening bolt 21, and this point is also significantly more convenient than the bonding method. Note that among the elements constituting the invention of the second embodiment, the elastic members having the greatest effect on the operation and effect are the same as those used in the above-described first embodiment. The effect is the same as that of the first embodiment, and a duplicate description will be omitted.

The present invention is not limited to the embodiment described above and shown in the drawings, but can be variously modified without departing from the scope of the invention. For example, in the above-described embodiment, the structure in which the open ends of the diagonal members and the horizontal members that are the web members of the steel tower are sealed is described.
It can be widely used as a structure for sealing an open end of a pipe material constituting a steel pipe structure such as a bridge or a steel pipe truss structure. Also, as described above, the joint plate as the connecting means for connecting the pipe members uses the U-shaped joint plate and the cruciform joint plate. However, an I-shaped joint plate and other shapes of joint plates are used. In this case, the opening end can be effectively sealed. Further, the present invention is not limited to a newly constructed steel tower, and can be mounted on an existing steel tower or the like.

[0028]

As is apparent from the above description, according to the first aspect of the present invention, the airtight elastic member is sandwiched between the first hard member and the second hard member, and the inside of the opening is formed. Simple operation of simply compressing while inserted into the tube, quickly attaches to the end opening of the pipe structure, and eliminates the cumbersome work management that is required when bonding elastic members with an adhesive as in the past. It can be easily installed even in poor working environments such as rainy weather or working at high places outdoors, and even if the internal inspection of the pipe is required unlike the adhesive method, the first
The opening end sealing structure can be removed by a simple operation of simply loosening the compression between the hard member and the second hard portion, which is also significantly more convenient than the bonding method, An elastic member having incompressibility, elasticity, and airtightness is sandwiched between two hard members in a sandwich shape, and this is inserted into a cylindrical tubular member and strongly compressed by the two hard members. In addition, since the sealing stress is raised by deforming the elastic member and restricting the flow of the elastic member in the tube material, the sealing function can be maintained semi-permanently. It is sandwiched between members, enclosed in a tube material, mounted in a compressed state and protected from the outside, and is not easily affected by external factors other than being affected by stress and temperature, so there is little environmental degradation and long-term use Can withstand.

According to the second aspect of the present invention, there are provided four members, namely, a tightening bolt, first and second hard members, and an elastic member.
Although it has a very simple structure, it exhibits the effects of the invention of the above-mentioned claim 1, and is particularly easy to install, and even when inspecting the inside of the pipe after a simple operation of loosening and pulling out the tightening bolt, the open end is easily obtained. The sealing structure can be removed. According to the third aspect of the present invention, it is possible to apply the open end airtight structure of the present invention regardless of whether the joint plate fixed to the end of the pipe is U-shaped, one-letter shaped, or cross-shaped. Thus, an effect peculiar to the invention of claim 1 or 2 can be obtained. According to the invention of claim 4, it is possible to prevent a so-called creep phenomenon in which the elastic member moves while being gradually deformed into a gap formed between the elastic member and a pipe (generally a steel pipe) for a long-term compression use. In other words, a decrease in stress relaxation can be prevented, and airtightness can be maintained even in long-term use. According to the invention of claims 5 and 6,
Since the elastic member is formed of a material that is extremely excellent in heat resistance, cold resistance, acid resistance, seawater resistance, and weather resistance, the airtightness of the open end of the tube can be maintained for a long time.

According to the seventh aspect of the present invention, since the peroxide crosslinking is carried out while avoiding the use of a crosslinking agent (sulfur) generally used in the production of rubber, the contact surface between the elastic member and the pipe member is formed. Metal corrosion due to residual sulfur can be prevented. According to the invention of claim 8, since the volume specific resistance value of the elastic member is set to 10 ⁵ Ωcm or more, so-called electrolytic corrosion, which is corroded by an electromotive force due to a potential difference between the contact surface of the elastic member and the tube material, is reliably prevented. Therefore, the life of the tubing can be significantly extended. According to the ninth aspect of the present invention, since the hardness is set between 5 degrees and 60 degrees, a large amount of deformation can be obtained with a small torque, and a predetermined airtight performance can be obtained. In order to improve the airtight performance by giving a large displacement with a small torque during compression deformation,
The elastic member preferably has a hardness of 20 to 40 degrees. The elastic body according to claim 10 has a thickness of the elastic body of 15 to
30 mm and the gap between the outer circumference of the pipe itself and the inner circumference of the pipe material are set to 1 to 3 mm, so that the creep phenomenon is prevented, the stress relaxation is not reduced, and the pipe structure capable of maintaining sufficient airtightness for long-term use. An open end sealing structure for an object can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external configuration of a tube structure according to a first embodiment of the present invention in an assembled state of an open end sealing structure.

FIG. 2 shows a fastening bolt, an outer plate as a first hard member, an elastic plate as an elastic member, and an inner plate as a second hard member, respectively, which constitute the open end sealing structure of FIG. It is an exploded perspective view which shows it disassembled.

FIG. 3 is a half sectional view showing a process of attaching an open end sealing structure according to the present invention to an end of a diagonal member.

FIG. 4 is a half sectional view showing a state in which an open end sealing structure according to the present invention is attached to an end of a diagonal member.

FIG. 5 is a left side view (a) showing a state in which the open end sealing structure shown in FIG. 1 is attached to a substantially semicircular open end formed by a horizontal member or a diagonal member and a joint plate, and FIG. X-
It is X-ray arrow direction sectional drawing.

FIG. 6 is a perspective view showing a perspective view of a configuration of a tube structure according to a second embodiment of the present invention in an assembled state of an open end sealing structure.

FIG. 7 shows a fastening bolt, an outer plate serving as a first hard member, an elastic plate serving as an elastic member, and an inner plate serving as a second hard member, each of which constitutes the open end sealing structure of FIG. It is an exploded perspective view which shows it disassembled.

FIG. 8 is a half sectional view showing a process of attaching an open end sealing structure according to a second embodiment of the present invention to an end of, for example, a horizontal member or a diagonal member, which is one of reinforcing members constituting a steel tower. FIG.

FIG. 9 is a partial cut-away view showing a state where the open-end sealing structure according to the second embodiment of the present invention is attached to an end of, for example, a horizontal member or a diagonal member, which is one of reinforcing members constituting a steel tower. It is sectional drawing.

FIG. 10 is an elevation view showing a partial configuration of a conventional power transmission / communication tower.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base member 2 Main pillar material 3 Horizontal material 4 Diagonal material 5 Gusset plate 6,20 Joint plate 6a, 25 Bolt mounting hole 7 Relay plate 11,21 Tightening bolt 11a, 21a Male screw part 12,22 Outer plate 12a, 22a, 22c, 23b, 24b Cut-off portion 12b, 13a, 22b, 23a Through hole 13, 23 Elastic plate 14, 24 Inner plate 14a, 24a Female screw portion 15, 26 Mounting bolt 27 Nut

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhito Iwabuchi 180-1 Nanakita Higashiura, Izumi-ku, Sendai City, Miyagi Prefecture Inside Bridgestone IPE Corporation (72) Inventor Tokai Yamabe 4330 Omosa, Tarui-cho, Fuwa-gun, Gifu Prefecture Kuraraypla Styx Corporation Ibuki Plant (72) Inventor Yasuhiro Itasaka 1-12-3 Hamamatsucho, Minato-ku, Tokyo Sanwa Steel Equipment Co., Ltd. F-term (reference) 2D059 BB33 2E125 AA35 AA52 AB17 AC16 AE13 AG03 AG09 AG12 AG41 BB01 BB08 BB09 BB16 BB22 BC02 BD01 BE02 BE05 BE07 BE08 BF01 CA05 CA19 EA15 EA21 EA33

Claims (10)

[Claims] 1. An open end sealing structure for sealing an open end of a pipe material constituting a pipe structure, wherein an airtight elastic member is sandwiched between a first hard member and a second hard member. An opening in a pipe structure, characterized in that it is configured to be able to move the volume of the elastic member toward the inner surface of the opening of the tube by being compressed while inserted into the opening, thereby closing the opening end. Edge sealed structure. 2. An open end sealing structure for sealing an open end of a pipe material constituting a pipe structure, wherein a tightening bolt and a through hole through which the tightening bolt is inserted are formed, and the open end is formed. A first rigid member in the form of a flat plate which is in contact with the opening; and a through-hole through which the tightening bolt is inserted is formed, and has an outer shape capable of loosely fitting into the opening, and has a thick air-tight elasticity. A first hard member having a female screw portion to be screwed with a male screw portion of the tightening bolt, and a plate-shaped second hard member having an outer shape capable of loosely fitting into the opening. With the elastic member interposed between the member and the second hard member, the elastic member is compressed by tightening the tightening bolt to reduce the volume of the elastic member toward the inner surface of the opening of the tube. The opening end can be closed by moving the opening. Open end sealed structure of the tube structure to. 3. The second hard member and the elastic member,
The front and back or two orthogonal surfaces of a plate-like joint plate projecting in the axial direction from an opening of a pipe constituting a power transmission / communication tower or bridge and dividing the opening into two or four parts and an inner periphery of the tube. The first hard member has a shape that can be loosely fitted into the opening end portion to be formed, and the first hard member has a shape that can contact the opening end surface.
4. The closed structure at the open end of the pipe structure according to 1. 4. The closed structure for an open end of a tubular structure according to claim 1, wherein the elastic member is made of an elastic body having a cross-linked molecular structure. 5. The closed structure for an open end of a pipe structure according to claim 1, wherein the elastic member is an elastic body made of an ethylene-propylene copolymer rubber. . 6. The closed structure for an open end of a pipe structure according to claim 1, wherein the elastic member is made of silicone rubber. 7. The closed structure for an open end of a pipe structure according to claim 5, wherein the elastic body has a crosslinking treatment performed by peroxide crosslinking. 8. The elastic body has a volume resistivity of 10 ^5.
The open end sealing structure of the tube structure according to any one of claims 1 to 3, wherein the resistance is not less than Ωcm. 9. The elastic body may be 5 to 60 degrees (JIS
The open end sealing structure of a pipe structure according to claim 7 or 8, wherein the structure has a hardness of K6301 (JISA standard). 10. The elastic body has a thickness of 15 mm to 30 mm, and has a gap of 1 mm to 3 mm between its outer periphery and the inner periphery of the tube in a natural state inserted into the tube. 10. The closed structure for an open end of a tubular structure according to claim 9, wherein the closed end is formed.