JP2003018732A - Method of reinforcing hollow column and such reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve, in an installed state, the bend strength of a hollow column such as a hollow concrete pole. SOLUTION: A composite part 5 integrating reinforcement materials 4, 4 and a thrusting means 5 is inserted from the upper mouth and positioned in the hollow section 2 of the hollow column 1; the thrusting means 5 is then extended to bend and deform the reinforcement materials 4, 4 along the inner wall of the hollow column 1 while at the same time pressing them against the inner wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and structure for improving the strength of hollow pillars, and more particularly, to improving the strength of hollow concrete pillars in the installed state without changing the appearance and outer diameter. The present invention relates to a strength improving method and a strength improving structure.

[0002]

2. Description of the Related Art Concrete poles are used for aerial overhead wires. Some of these concrete columns are solid concrete columns with a solid interior, but the price is high because the amount of concrete used is large, and since it is heavy, transportation and construction costs are also high. Therefore, hollow concrete columns are generally used.

[0003]

By the way, in recent years, along with the development of communication technology, it is required to add optical fibers, telephone lines, additional electric wires, etc. to an existing hollow concrete column. However, in order to add these wires to the existing hollow concrete columns, it is necessary to add materials such as new arms and insulators. Based on the bending stress calculated based on the total weight of gold, insulator, etc.,
Since the one with bending strength suitable for it is installed,
If optical fiber, telephone line, additional electric wire, horizontal metal for attaching it, insulator, etc. are added, the bending strength of the hollow concrete column may be insufficient.

Therefore, it is necessary to improve the strength of the hollow concrete column. In this case, the existing hollow concrete column is pulled out, and a new hollow concrete column having a larger bending strength is re-installed or pulled out. It is conceivable that the pillars will be re-installed after being subjected to strength-enhancing processing, but both require extraction and (re) installation costs, which not only increases costs,
The work time is also lengthened due to extraction and (re) installation. Furthermore, when pulling it out and re-installing it, the consent of the installation land owner is obtained, and the neighboring residents are asked to understand.
Negotiations may be difficult and construction may be difficult.

Even when the removed hollow concrete columns are reused in another place, if the strength is low, the reuse destination may not be found, which may result in long-term inventory and eventually industrial waste. Is not preferable from the viewpoint of.

[0006] At present, a method for improving the strength of an existing hollow concrete column that reinforces the outer surface of the existing hollow concrete column is predominant. However, such a method of improving the strength from the outer surface is inevitably external. It is often difficult to obtain the consent of the landowner or, in some cases, a resident in the neighborhood, because it becomes unsightly. Even if this is not the case, it is difficult to attach materials such as standardized arms and scaffolding bolts to the outer surface of the hollow column due to the increase in outer diameter, In many cases, it was difficult to reinforce the entire hollow columnar structure, for example, it was not possible to reinforce the parts to which materials and equipment were attached unless it was removed.

Therefore, from the viewpoint of resource protection and environmental protection, if existing hollow concrete pillars and other hollow pillars can be reused by improving the strength of the existing hollow pillars and reinforcing the removed hollow concrete pillars. Originally, not only the extraction cost and the re-installation cost can be saved, but also the work time is shortened, and since the appearance does not change, there is no trouble with the land owner and neighboring residents, so the effect is Some are too large to measure.

In view of the above problems, the present invention provides a hollow columnar article such as an existing or removed hollow concrete column,
It is an object of the present invention to provide a method for improving the strength and a structure for improving the strength of a hollow columnar article which improves the strength in the installed state or the stored state.

[0009]

In order to solve the above-mentioned problems, a method for improving the strength of a hollow columnar article according to claim 1 of the present invention comprises a plurality of reinforcing members arranged facing each other. After inserting and arranging a composite having a pressing means for enlarging the interval dimension of these reinforcing materials and pressing it against the inner wall between these reinforcing materials, the pressing means is inserted and arranged along the longitudinal direction in the hollow portion of the hollow columnar object. According to the present invention, the space between the reinforcing plates is enlarged, and the reinforcing plates are curved and deformed along the inner wall of the hollow portion of the hollow columnar body and pressed against the inner wall.

According to such a method for improving the strength of the hollow columnar article, a composite body in which the reinforcing material and the pressing means are integrated is inserted into the hollow part of the hollow columnar article from the upper opening thereof, and the reinforcing material is pressed by the pressing means. By expanding the gap size and bending and deforming the reinforcing material along the inner wall of the hollow columnar body and pressing it against the inner wall, the strength can be improved even in the installed state, and no extraction and re-installation costs occur. Then
It is also excellent in terms of resource conservation and environmental protection. Moreover, it is not necessary to change the installation location, and it is not necessary to obtain a new understanding from the landowner in that respect, and since the appearance does not change, in that sense, the understanding of the landowner and neighboring residents is understood. Easy to obtain. Furthermore, since it is reinforcement from the inside of the hollow columnar object, the outer diameter dimension of the hollow columnar object does not increase,
Standard equipment can be added.

According to a second aspect of the present invention, there is provided a strength improving structure for a hollow columnar article, wherein a reinforcing material curved in a width direction is arranged along a longitudinal direction of a hollow portion of the hollow columnar article, and the reinforcing material is provided. It is characterized in that it comprises a pressing means for pressing against the inner wall of the hollow portion.

According to the structure for improving the strength of the hollow columnar body as described above, since the reinforcing material is arranged inside the hollow columnar body, the strength can be improved in the installed state, and the pulling out and the re-installation can be performed. It costs no money and is excellent in terms of resource conservation and environmental protection. Moreover, it is not necessary to change the installation location, and it is easy to obtain the consent of the landowner in that respect, and since the appearance does not change, it is easy to obtain the consent of the landowner and neighboring residents. Further, since the hollow columnar body is reinforced from the inside, the outer diameter dimension of the hollow columnar body does not increase, so that standard equipment can be added.

According to a third aspect of the present invention, in the structure for improving the strength of the hollow columnar article, the reinforcing material has a child steel material among a plurality of parent steel materials.

According to such a structure for improving the strength of the hollow columnar material, since the amount of the reinforcing material used is small, a large strength can be obtained even though the reinforcing material is lightweight and inexpensive. Such a reinforcing material can be, for example, a truss structure, and the parent steel members are connected by corrugated thin steel plates, those which are connected by a plurality of rings, or those which are connected in a slanted lattice shape. It can be configured arbitrarily.

According to a fourth aspect of the present invention, in the structure for improving the strength of the hollow columnar article, a plurality of the reinforcing materials are provided, and the plurality of reinforcing materials are provided on the inner wall in the longitudinal direction in the hollow portion of the hollow columnar article. It is characterized in that they are arranged along the circumference at equal intervals.

According to the structure for improving the strength of the hollow columnar body, since the reinforcing material is arranged at equal circumferential positions along the longitudinal side wall in the hollow columnar body, they are arranged at 180 ° intervals. In this case, the bending strength in the two directions can be increased. Depending on the case, two sets of reinforcing materials may be used and arranged at 90 ° intervals to increase the bending strength in four directions, or arranged at 120 ° intervals to increase bending strength in three directions. It can also be made larger.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the method for improving the strength and the structure for improving strength of the hollow columnar article of the present invention will be described below.
A description will be given with reference to the drawings.

FIG. 2 shows a hollow concrete column 1 before strength improvement.
FIG. Hollow concrete column 1 has a column length of 11
m to 16m are standard products, and non-standard products are 9
m, 10m, 17m products, etc. The hollow concrete pillar 1 has a thickness of about 40 m by a molding method using centrifugal force.
It is formed in the shape of a truncated cone of about m, and has a hollow portion 2 inside. Depending on the application, various mounting holes (not shown) such as normal scaffolding bolt mounting device, auxiliary scaffolding bolt mounting device, number tag mounting device, ground wire introducing device, ground wire drawing device, earth terminal mounting device, etc. It is provided.

In the hollow portion 2 of the hollow concrete column 1, two reinforcing members 4 and 4 arranged to face each other along the longitudinal direction thereof and a space dimension between these reinforcing members 4 and 4 are enlarged. A plurality of pressing means 5 for pressing the reinforcing members 4 and 4 along the inner wall of the hollow portion 2 of the hollow concrete column 1 by curving and deforming them.
A complex 3 formed by combining and is stored.

FIG. 3 is an enlarged partial perspective view of the embodiment of the reinforcing member 4. The reinforcing member 4 has a truss structure in which two parent steel members 41 and 42 are opposed to each other at a predetermined interval, and the parent steel members 41 and 42 are joined and integrated by a child steel member 43.
In such a truss structure, the amount of steel used is small relative to the external dimensions, and although the reinforcing members 4 and 4 are lightweight and inexpensive, high strength can be obtained.

A plurality of mounting tools 4 for mounting pressing means (5), which will be described later, on the opposing surfaces of the reinforcing members 4 and 4, respectively.
4 are fixed at predetermined intervals by welding or the like.

FIG. 4 is an enlarged perspective view of the mounting tool 44 fixed to the opposing surfaces of the reinforcing members 4 and 4. This wearing tool 44
Is a rear plate portion 44a made of steel and both side plate portions 4a.
A space 44e surrounded by 4b and 44c and a front plate portion 44d
Is formed in a rectangular tube shape or a box shape, and has a notch portion 44f at the center upper end portion in the width direction of the front plate portion 44d.
Are formed. The width dimension of the notch portion 44f is set corresponding to the dimension of the pressing means 5 described later.

In FIG. 5, the reinforcing members 4 and 4 are attached to the mounting members 44 and 44 shown in FIG. 4 to expand the distance between the pair of reinforcing members 4 and 4, thereby making the reinforcing members 4 and 4 hollow. FIG. 6 is an enlarged plan view of a pressing means 5 for pressing the inner wall of the portion 2 while curving and deforming the inner wall.

The pressing means 5 has a pair of pressing portions 5a and 5b arranged at a distance corresponding to the distance between the pair of reinforcing members 4 and 4. The pressing portions 5a and 5b are located outside the pressing portions 5a and 5b. The portion is formed into an arc surface having a curvature substantially equal to the curvature of the inner wall surface of the hollow portion 2 of the hollow concrete column 1.

The pair of pressing portions 5a and 5b are provided with a shaft 5c,
5d is rotatably attached to the screw shafts 5e and 5f having male threads engraved on the outer peripheral surface thereof. The screw shafts 5e and 5f are nut pipes 5 having female threads engraved on the inner surface thereof.
It is accommodated in g and 5h and is connected to the drive unit 5i. The drive unit 5i in the illustrated example is configured to rotate about the shaft centers of the screw shafts 5e and 5f, and has an outer circumferential surface formed with irregularities in the axial direction so as to be easily driven to rotate from a separated position. . Therefore, when the drive portion 5i is rotationally driven around the axis, the nut tubes 5g and 5h rotate and the screw shafts 5e and 5f extend outward. By extending the screw shafts 5e and 5f, the pair of pressing portions 5
The space dimension between a and 5b increases.

A pair of pressing parts 5 in the pressing means 5
The thicknesses a and 5b of the pressing means 5 in the length direction and the width dimension in the direction orthogonal thereto are set so that they can be housed in the space 44e of the mounting tool 44. The outer diameter of the pair of screw shafts 5e and 5f in the pressing means 5 is set to be slightly smaller than the width of the cutout 44f of the mounting tool 44.

Therefore, when the pair of pressing portions 5a and 5b of the pressing means 5 are accommodated from above in the cavities 44e and 44e of the mounting tools 44 and 44 fixed to the facing surfaces of the pair of reinforcing members 4 and 4, respectively. , The screw shafts 5e and 5f are the fittings 4
4, 44 front plate portions 44d, 44d notch portions 44f, 44
It can be handled as a composite body 3 which is fitted in f and in which the pair of reinforcing members 4 and 4 and the pressing means 5 are integrally combined.

As shown in FIG. 2, such a composite body 3 is inserted into the hollow portion 2 of the hollow concrete pillar 1 through the upper end opening thereof, and then the rotary drive portion 5i is placed from above the hollow concrete pillar 1. Drive to rotate. At this time, for example, if a driving jig (not shown) having engraved concaves and convexes engaging with the concaves and convexes of the driving portion 5i is used in the width direction of the long rod or the endless belt, the driving portions of all the pressing means 5 can be used. It is possible to rotate 5i in a lump. In this way, when the drive unit 5i is rotationally driven, the nut tubes 5g and 5h rotate, the screw shafts 5e and 5f extend outward, and the extension of the screw shafts 5e and 5f causes the pair of pressing units to extend. The space dimension between 5a and 5b increases.

FIG. 1A is an enlarged cross-sectional view showing the hollow concrete column 1 before the strength is improved, and FIG. 1B is an enlarged cross-sectional view of the hollow concrete column 1 after the strength is improved.

That is, as shown in FIG. 1 (A), in the hollow portion 2 of the hollow concrete column 1, a composite body 3 in which the pair of reinforcing members 4 and 4 and the pressing means 5 are integrated is formed. When the driving portion 5i of the pressing means 5 is rotationally driven by the above-mentioned method after the insertion and placement from the upper opening of the nut 2, the nut tubes 5g and 5h rotate, and accordingly the screw shafts 5e and 5h.
f extends outward, and a pair of pressing portions 5a and 5b
Presses the widthwise ends of the pair of reinforcing members 4, 4 against the inner wall of the hollow portion 2 of the hollow concrete column 1.

At this time, the pair of pressing portions 5a and 5b are attached to the shaft 5
Since they are connected to the screw shafts 5e and 5f by c and 5d, even if there are some irregularities on the inner wall of the hollow portion 2, the pressing portions 5a and 5b rotate about the shafts 5c and 5d, The curved surface portions on the outer side of the pressing portions 5a and 5b can be smoothly opposed to the inner wall.

When the driving portion 5i of the pressing means 5 is further driven to rotate, the pair of reinforcing members 4 and 4 are curved and deformed along the curved surface of the inner wall of the hollow portion 2 of the hollow concrete column 1, and
As shown in (B), the pair of curved reinforcing members 4,
4 is pressed along the inner wall of the hollow portion 2 of the hollow concrete column 1 to be in close contact therewith. Since the reinforcing members 4 and 4 are arranged on the inner circumference of the hollow portion 2 at intervals of 180 degrees, the bending strength of the hollow concrete column 1 in two directions is improved.

Although not shown, a cap is put on the top of the hollow concrete pillar 1 for which the strength improving work has been completed,
Rainwater is prevented from entering the hollow portion 2 and the reinforcement 4,
4 and pressing means 5 should not rust.

Although the above embodiment has been described with respect to a specific configuration, the present invention can be variously modified without departing from the spirit thereof.

For example, the reinforcing members 4 and 4 are not limited to the truss structure of the illustrated example, but two thin steel plates are connected by corrugated thin steel plates, or a plurality of circular rings are connected, It may be connected in a slanted lattice.

Further, the pressing means 5 is not limited to the one in which the driving portion 5i rotates about the axis of the pressing means 5 as shown in the illustrated example, but also the pressing means 51 shown in FIG. 6 (A). ,
First, the elastic force of a built-in spring (not shown), such as a structure that is rotationally driven in the horizontal plane from the direction orthogonal to the axis, that is, the pressing means 52 shown in FIG. 6B. In the state of being constrained in a "dogleg shape" against the above, and by returning the linear state by the elastic force of the built-in spring in which the constrained state is released by rotating the driving portion 52i in the horizontal plane, A pair of pressing parts 52a, 52
A configuration in which the interval dimension of b is enlarged may be used. Note that the figure
In the case of 6 (B), unlike the case of FIG. 5 and FIG. 6 (A), the space dimension of the pair of pressing portions 52a and 52b is expanded due to the shape change, so 52e and 52f are not screw shafts. Just a shaft, 52g,
52h may be a simple tube instead of a nut tube. In some cases, the shaft and the tube may be integrated.

In the above embodiment, one set of composite 3
However, two sets of composites may be used in an orthogonal state. By doing so, the reinforcing members 4 are arranged at 90 ° intervals in the circumferential direction of the hollow portion 2 of the hollow concrete column 1, and the bending strength of the hollow concrete column 1 in four directions can be improved. In addition, like this, 2
When a set of composites 3 is used, the driving unit of the pressing means is not provided in the central portion like the pressing means 5, 51, 52 shown in FIG. 5 and FIGS. Therefore, it is necessary to take measures such as providing the pressing means at an eccentric position in the longitudinal direction so as not to interfere with the above.

In the above embodiment, the case where the two reinforcing members 4 and 4 are set as one set has been described, but the three reinforcing members 4, 4 and 4 are circumferentially arranged at intervals of 120 degrees. It may be arranged at equal positions. In this case, as the pressing means, the three pressing portions are arranged at the circumferentially equidistant positions, and the driving portion drives the three pressing portions.
The pressing parts are configured to expand in the radial direction.

Furthermore, the present invention can be applied not only to hollow concrete columns, but also to improving the strength of other hollow columnar products.

Further, the present invention is characterized in that the strength of hollow pillars such as hollow concrete pillars can be improved in the installed state. For example, the strength of hollow pillars stored in a warehouse can be improved. It can also be applied when improving.

[0041]

As described above, the method for improving the strength of the hollow columnar article of the present invention is such that a plurality of reinforcing members arranged facing each other and a space between these reinforcing members are provided between the reinforcing members. After inserting and arranging a composite having a pressing means for enlarging the size and pressing it against the inner wall along the longitudinal direction in the hollow portion of the hollow columnar body, the interval size of the reinforcing plate is expanded by the pressing means to reinforce. Since the plate is curved and deformed along the inner wall of the hollow columnar object and pressed against the inner wall, it is possible to improve the strength of the hollow columnar object in the installed state, and it is possible to perform pulling work or re-assembly. Installation work is not required, and reinforcement work can be done in a short period of time. Moreover, since the external appearance and outer diameter dimensions do not change, it is easy to obtain the consent of the landowner, and standard equipment and materials can be installed.

Further, in the strength improving structure of the hollow columnar article of the present invention, a reinforcing material curved in the width direction is arranged along the inner wall in the longitudinal direction of the hollow columnar article, and the reinforcing material is pressed against the inner wall. Since the reinforcing material and the pressing means improve the bending strength of the hollow columnar object.

[Brief description of drawings]

FIG. 1A is an enlarged cross-sectional view of a hollow columnar object according to an embodiment of the present invention before improvement in strength, and FIG. 1B is an enlarged transverse sectional view of the hollow columnar object according to an embodiment of the present invention after improvement in strength. Is.

FIG. 2A is a perspective view before strength improvement for explaining the strength improvement method and the strength improvement structure of the hollow columnar object according to the embodiment of the present invention.

FIG. 3 is an enlarged partial perspective view of a reinforcing member before strength improvement for explaining a strength improving method and a strength improving structure according to an embodiment of the present invention.

FIG. 4 is an enlarged perspective view of a wearing tool used in the method for improving the strength and the structure for improving the strength of the hollow columnar object according to the embodiment of the present invention.

FIG. 5 is a plan view of a pressing means used in the strength improving method and the strength improving structure of the hollow columnar object according to the embodiment of the present invention.

FIG. 6 (A) is a plan view of a pressing means in another embodiment used in the strength improving method and the strength improving structure of the hollow columnar article of the present invention, and FIG. 6 (B) is a method of improving the strength of the hollow columnar article of the present invention, and FIG. 11 is a plan view of a pressing means used in a strength improving structure according to still another embodiment.

[Explanation of symbols]

1 Hollow pillar (hollow concrete pillar) 2 hollow part 3 complex 4 Reinforcement material 41, 42 parent steel 43 Child steel 44 Wearing equipment 5,51,52 pressing means 5a, 5b, 51a, 51b, 52a, 52b Pressing part 5c, 51c, 52c, 5d, 51d, 52d axis 5e, 51e, 5f, 51f screw shaft 5g, 51g, 5h, 51h nut tube 5i, 51i, 52i drive unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akihiro Kashiwagi             3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture             Kansai Electric Power Co., Inc. F-term (reference) 5G367 AA02 AD13

Claims (4)

[Claims] 1. A plurality of reinforcing members arranged to face each other,
After inserting and arranging a composite having a pressing means for enlarging the interval dimension of these reinforcing materials and pressing it against the inner wall between these reinforcing materials, the pressing means is inserted and arranged along the longitudinal direction in the hollow portion of the hollow columnar object. A method for improving the strength of a hollow columnar article, characterized in that the reinforcing plate is enlarged in a space dimension thereof to be curvedly deformed along the inner wall of the hollow portion of the hollow columnar article and pressed against the inner wall. 2. A reinforcing member which is curved in the width direction along the longitudinal direction of the hollow portion of the hollow columnar body is provided, and a pressing means for pressing the reinforcing member against the inner wall of the hollow portion is provided. A structure for improving the strength of hollow pillars. 3. The strength improving structure for a hollow columnar article according to claim 2, wherein the reinforcing material has a child steel material between a plurality of parent steel materials. 4. A plurality of the reinforcing members, wherein the plurality of reinforcing members are arranged at equal circumferential positions along the inner wall in the longitudinal direction within the hollow portion of the hollow columnar member. The structure for improving the strength of a hollow columnar article according to claim 2 or 3.