JP2024041663A - Pillar protection parts and corrosion prevention structure for metal columns - Google Patents

Abstract

To prevent corrosion of columns by preventing accumulated dust from coming into contact with the columns.SOLUTION: A column protection component 10 for protecting an exposed root portion of a column 1 has a sloping face which covers an outer periphery of the root portion of the column 1 in top view and whose upper face moves downward as moving away from the column 1. The sloping face is composed of a roof-like structure having: a first plate material 10A which slopes downward as moving away from the column 1 in one radial direction of the column 1; and a second plate material 10B whose upper end is connected to an upper end of the first plate material 10A and which slopes downward as moving away from the column 1 in the other radial direction of the column 1. In the roof-like structure, an opening through which the column 1 passes is formed at a position including a part of a peak-like connection portion PL where the upper end of the first plate material 10A and the upper end of the second plate material 10B are connected.SELECTED DRAWING: Figure 1

Description

The present invention relates to a technique for protecting the base of an existing metal pillar and preventing corrosion at the base. The present invention is a technique particularly suitable for columns that constitute a structure.

For example, the lower part of a metal column is buried in concrete (foundation) and fixed, so that the column stands up from the foundation. Further, for example, the lower end of the metal column is fixed to concrete (foundation) via a base plate, so that the column stands up from the foundation.
If such pillars are placed in an environment where dust tends to fly and accumulate, dust will accumulate around the outer periphery of the base of the pillar (foundation side), and the water retention effect of the accumulated dust will cause The base of the pillar becomes a corrosive environment.

As a conventional technique for preventing corrosion at the base side of such a column, for example, corrosion prevention treatment is performed by painting the base side of the column, using a cover, a coating method, or the like. For example, Patent Document 1 describes the use of a material with high corrosion resistance in areas where corrosion is likely to occur, such as near the embedded portion. Further, Patent Document 1 describes that a resin cover is provided near the embedded portion. Further, Patent Document 2 discloses that surrounding areas of existing steel pipe columns where corrosion has occurred are reinforced and the gaps are filled with mortar.

JP 2016-141829 A JP 2011-117166 A

However, with conventional technology, it is impossible to avoid deterioration of the caulking and the intrusion of moisture such as rainwater through the gap between the mortar and the steel pipe column.
Furthermore, in a dust-accumulating environment, dust has a water-retaining effect, so the wetting time for the pillar surface increases at the dust-accumulating location. This causes a problem in that corrosion is accelerated at the base of the column and there is a risk that a sufficient life extension effect may not be obtained.

Here, the method described in Patent Document 1 uses caulking or the like at the joint between resin and steel to prevent moisture from entering. However, this method has a problem in that there is a concern that moisture may enter due to age-related deterioration of caulking and the like. Furthermore, this method has a problem in that corrosion occurs in the upper part of the cover when the height of dust accumulation becomes high.
Furthermore, in the method of Patent Document 2, there is a concern that dust may accumulate on the upper part of the reinforcing material in a dust-accumulating environment, and corrosion may occur due to the dust deposited on the upper part of the reinforcing material.

The present invention focuses on the above-mentioned points, and an object of the present invention is to prevent the accumulated dust from coming into contact with the pillars, thereby preventing corrosion of the pillars.

The present inventor has developed an umbrella-shaped or gable roof-shaped pillar protection component that forms a sloped surface that slopes downward as it moves away from the pillar, that is, a slope that slopes away from the pillar as it moves downward, on the outer periphery of the base of the pillar. I thought about attaching it to. The idea was that this would prevent the dust that accumulates around the pillars from coming into contact with the surfaces of the pillars.
Furthermore, the present invention was developed taking into consideration the ease of production.

In order to solve the problem, one aspect of the present invention is a pillar protection component that protects an exposed root portion of an erected metal pillar, the outer periphery of the root portion of the pillar when viewed from above. and the upper surface has an inclined surface that slopes downward as the distance from the pillar increases, and the slope slopes toward one side in the radial direction of the pillar and slopes downward as it moves away from the pillar. a second plate whose upper end is connected to the upper end of the first plate, and which slopes toward the opposite side of the column in the radial direction and downward as it moves away from the column; The roof-like structure has a part of a peak-shaped connecting portion where the upper end of the first plate and the upper end of the second plate are connected. The gist is that an opening through which the pillar passes is formed at a position including the pillar.

According to an aspect of the present invention, even if a situation occurs in which dust flies and accumulates at the base of a column, the dust is prevented from coming into contact with the column, thereby preventing corrosion at the base of the column. do. Note that the dust on the pillar protection component falls along the slope and accumulates at a position away from the pillar.
Further, according to one aspect of the present invention, it is possible to prevent not only dust but also moisture such as rainwater from accumulating, and therefore corrosion can also be prevented from this point of view.
Moreover, by constructing the pillar protection component from a flat plate material, it becomes possible to easily manufacture the pillar protection component.

FIG. 2 is a diagram illustrating a pillar protection component according to an embodiment based on the present invention. (a) is a top view. (b) is a side view seen from the direction in which the peaks extend. (c) is a side view seen from the first plate material side. It is a figure which shows the example of a joint of the 1st and 2nd board|plate material and a base plate. It is a figure which shows the example of joining a side member and a base plate. It is a figure explaining the pillar protection component for the pillar concerning the example of other embodiments. (a) is a top view. (b) is a side view seen from the direction in which the peaks extend. (c) is a side view seen from the first plate material side.

Next, embodiments of the present invention will be described with reference to the drawings.
The purpose of the pillar protection component of this embodiment is, for example, to protect the base of a metal pillar that is erected from the foundation and is exposed from the foundation.
In this embodiment, as shown in FIG. 1, the metal column will be described using as an example a metal column made of a steel pipe or the like that is erected from a foundation such as concrete.

(About installing pillars)
The lower end of the column 1 is fixed to the foundation concrete, so that the column 1 is erected from the foundation 2. Note that the foundation 2 is not limited to a concrete foundation. The foundation 2 serves as a support base for supporting the pillar 1.
The pillar 1 is fixed to the foundation 2 by, for example, burying the lower part of the pillar 1 in the foundation 2. In this case, for example, an anchor member is provided at the lower end of the column 1 and the anchor member is fixed to the foundation concrete.

In this embodiment, as shown in FIG. 1, a base plate 3 serving as an anchor member is fixed to the lower end surface of a column 1 by welding.
An example will be described in which the column 1 is fixed to the foundation 2 by fixing the base plate 3 to the foundation 2 with anchor bolts 4. Another anchor member (not shown) may be provided at the lower end of the column 1 as the anchor member, and the above base plate 3 may be provided on the column 1 in the form of an outward flange in the middle of the lower portion of the column 1.

(Pillar protection part 10)
The pillar protection component 10 is a component that, when attached to the pillar 1, covers the outer periphery of the base of the pillar 1 when viewed from above, and has an inclined surface whose upper surface slopes downward as the distance from the pillar 1 increases. It is.
The pillar protection component 10 of this embodiment includes a first plate material 10A and a second plate material 10B, and when the upper ends of the first plate material 10A and the second plate material 10B are assembled, as shown in FIG. This results in a roof-like structure with an appearance similar to a gable roof.

The first plate member 10A is a rectangular and flat member that is inclined toward one radial direction of the column 1 (towards the right in FIG. 1A) and downward as it moves away from the column 1.
The second plate material 10B has its upper end connected to the upper end portion of the first plate material 10A, and is oriented toward the opposite side of the column 1 in the radial direction (toward the left side in FIG. 1(a)). It is a rectangular and flat member that slopes downward as it moves away from 1.
Note that in this specification, the radial direction is not limited to the diametrical direction when the cross section of the column is circular; for example, when the cross section of the column is elliptical or polygonal, it can be understood to mean the direction across the cross section. It shall be. The radial direction refers to a direction perpendicular to the vertical axis (extending direction) of the column 1, for example.

However, the roof-like structure including the first plate material 10A and the second plate material 10B has a peak-shaped connecting portion PL where the upper end portion of the first plate material 10A and the upper end portion of the second plate material 10B are connected. An opening constituting a penetration part 10D through which the pillar 1 passes is formed at a position including the part. The opening has the same or almost the same shape as the outer diameter contour of the column 1 when viewed from above.
The roof-like structure also includes a side member 10C that closes an opening on the side formed by the first plate 10A and the second plate 10B at the end in the extending direction of the connecting portion PL. The side member 10C is made of, for example, a triangular plate (see FIG. 1(B)). The shape of the side member 10C is not particularly limited as long as the outer surface has a wall shape extending vertically. Note that it is preferable that the side members 10C are provided at openings on both end sides of the connecting portion PL in the extending direction.

That is, the roof-like structure has a peak (ridge line) that is an imaginary line that passes through the pillar 1 in the horizontal direction, and the upper sides (upper ends) of the first plate material 10A and the second plate material 10B are connected to each other at the peak position. do. The first plate material 10A and the second plate material 10B are each arranged with a slope in two directions from the peak position, forming a triangular shape when viewed from the direction in which the peak extends. Then, the triangular space is closed off by the side member 10C. The side member 10C corresponds to a gable wall in a gable roof.
Then, an opening of a penetrating portion 10D that can penetrate the pillar 1 is formed at a position passing through the peak (connecting portion PL). Although it is preferable that the peak position passes through the center of the column 1, it may be eccentric from the center of the column 1.

Further, although it is preferable that the penetrating portion 10D is formed at the center in the extending direction of the peak, it may be shifted to the left or right.
In order to prevent dust and moisture from entering the base of the column 1 through the gap between the opening and the column with the column 1 penetrating the opening of the penetration section 10D, the opening of the penetration section 10D and the column 1 are joined. It is preferable that As a joining method, welding is preferable from the viewpoint of workability and durability of the joint. Note that instead of welding, the gap may be closed by filling the gap with caulking agent.

The inclination angle (gradient) θ of the first plate material 10A and the second plate material 10B is the depression angle from the horizontal direction, for example, 30 degrees or more, preferably 60 degrees or more, as shown in FIG. 1(b). . Further, although there is no particular upper limit to the inclination angle, for example, the upper limit is set to 80 degrees.
The angle of inclination of the first plate 10A and the angle of inclination of the second plate 10B may be the same or different.
When the pillar protection component 10 of this embodiment is assembled into the shape of a roof-like structure, the lower end surface of the first plate 10A, the lower end surface of the second plate 10B, and the lower end surfaces of the left and right side members 10C are as follows: For example, it is designed to be flush.

The roof-like structure that constitutes the pillar protection component 10 of this embodiment has a size that completely covers the base plate 3 when viewed from above. The pillar protection component 10 of this embodiment has a rectangular shape that is similar or substantially similar to the base plate 3 when viewed from above.
Here, in order to strengthen the connection between the column 1 and the base plate 3, a rib may be provided to connect the column 1 and the base plate 3, as shown in FIG. The rib is arranged within the base plate 3 when viewed from above, and the above-mentioned inclination angle is set so that the rib is arranged within the space formed by the roof-like structure.
In this embodiment, the pillar protection component 10 is made of a metal plate such as a steel plate or an aluminum alloy.

Next, an embodiment of joining the pillar protection component 10 to the pillar 1 or the base plate 3 will be described with reference to the drawings.
As shown in FIG. 1, in the pillar protection component 10 of this embodiment, the pillar 1 is located in the penetration part 10D, and the upper side of the first plate 10A and the upper side of the second plate 10B are fillet welded. and join to form a connecting portion PL. Then, the inner surface of the lower side of the first plate material 10A and the inner surface of the lower side of the second plate material 10B are joined to the upper side of the outer end surface of the base plate 3 by fillet welding, as shown in FIG. Reference numeral 11 indicates an example of a welded portion.

Note that the base plate 3 has a rectangular shape, and the first plate material 10A and the second plate material 10B are arranged so that their opposing directions are aligned in the directions of two opposing sides of the base plate 3. Further, the first plate material 10A and the second plate material are arranged so that the inner surface of the lower side of the first plate material 10A and the inner surface of the lower side of the second plate material 10B can contact the two opposing sides of the base plate 3, respectively. The dimensions and inclination angle of 10B are designed in advance.

Furthermore, the upper end of each side member 10C is joined to the lower surface of the first plate 10A and the second plate 10B by fillet welding, and the lower surface of each side member 10C is attached to the outside of the base plate 3. Join the end faces by fillet welding as shown in Figure 3.
As a result, the pillar protection component 10 is assembled, and the pillar protection component 10 is attached to the base of the pillar 1. The column protection component 10 is joined to the surface of the column 1 at the penetration portion 10D by fillet welding around the entire circumference.

(effects, etc.)
Thereby, the pillar protection component 10 can form a sealed space around the outer periphery of the base of the pillar 1. That is, with the above configuration, in this embodiment, even if a situation occurs where dust tends to fly and accumulate at the base of the column 1, the accumulated dust does not come into contact with the surface of the column 1 or the contact state is prevented. By preventing corrosion from continuing, corrosion at the base of the pillar 1 is prevented. Note that the dust on the top surface of the first plate material 10A and the second plate material 10B of the pillar protection component 10 falls along the slope of the top surface and is deposited at a position away from the pillar 1.
Furthermore, according to the present embodiment, not only dust but also moisture such as rainwater can be prevented from accumulating, and therefore corrosion can also be prevented.

(Modification)
(1) In Fig. 4, a joint portion extending in the vertical direction is formed at the lower end portion of the first plate material 10A and the second plate material 10B. This enables joining by fillet welding in a state where the surfaces are in contact with the outer end surface of the base plate 3, thereby improving, for example, the joining strength.
(2) In the above description, the pole protection part 10 is made of metal, but the pole protection part 10 may be made of resin such as carbon fiber. In this case, for example, the resin is melted and welded.
(3) In the above description, the lower end of the column protection part 10 is joined to the base plate 3, but the lower end of the column protection part 10 may be joined to the part of the foundation 2 on the outer periphery of the base plate 3. In addition, a sealed space may be formed inside the column protection part 10.

(others)
The present disclosure can also take the following configuration.
(1) A pillar protection component that protects the exposed base of an erected metal pillar,
Covering the outer periphery of the base of the pillar when viewed from above, the upper surface has an inclined surface that slopes downward as it moves away from the pillar,
The above slope is
a first plate member that is inclined in one radial direction of the pillar so as to be inclined downward as it moves away from the pillar;
a second plate member whose upper end portion is connected to the upper end portion of the first plate member, and which slopes toward the opposite side of the radial direction of the column so as to move downward as it moves away from the column;
It consists of a roof-like structure with
In the roof-like structure, an opening through which the pillar passes is formed at a position including a part of a peak-shaped connecting portion where the upper end of the first plate and the upper end of the second plate are connected. ing,
A pillar protection part characterized by:
(2) The roof-like structure includes side members that close openings on the side surfaces formed by the first plate material and the second plate material at both ends in the extending direction of the connecting portion.
The pillar protection component described in (1), characterized in that:
(3) A pillar protection component for the metal pillar fixed to the foundation via the base plate and erected,
The roof-like structure has a size that completely covers the base plate when viewed from above.
The pillar protection component described in (1) or (2), characterized in that:
(4) The pillar protection component according to any one of (1) to (3) is attached to the base of a metal pillar to prevent dust from accumulating at the base of the metal pillar. Anti-corrosion structure of pillars.
(5) The pillar is passed through the opening, and the opening and the pillar are joined by welding.
The corrosion-preventing structure of the metal pillar described in (4), characterized in that:

1 Column 2 Foundation 3 Base plate 4 Anchor bolt 10 Column protection component 10A First plate material 10B Second plate material 10C Side member 10D Penetration portion PL Connection portion (ridge)
θ Tilt angle

Claims (5)

A pillar protection component that protects the exposed base of an erected metal pillar,
Covering the outer periphery of the base of the pillar when viewed from above, and having an upper surface having an inclined surface that slopes downward as it moves away from the pillar,
The above slope is
a first plate member that is inclined in one radial direction of the pillar so as to be inclined downward as it moves away from the pillar;
a second plate member whose upper end portion is connected to the upper end portion of the first plate member, and which is inclined toward the opposite side of the radial direction of the column so as to move downward as it moves away from the column;
It consists of a roof-like structure with
In the roof-like structure, an opening through which the pillar passes is formed at a position including a part of a peak-shaped connecting portion where the upper end of the first plate and the upper end of the second plate are connected. ing,
A pillar protection part characterized by: The roof-like structure includes side members that close side openings formed by the first plate material and the second plate material at both ends in the extending direction of the connecting portion.
The pillar protection component according to claim 1, characterized in that: A pillar protection component for the metal pillar fixed to the foundation via a base plate and erected,
The roof-like structure has a size that completely covers the base plate when viewed from above.
The pillar protection component according to claim 1, characterized in that: A pillar protection component according to any one of claims 1 to 3 is attached to the base of a metal pillar to prevent dust from accumulating at the base of the metal pillar. Anti-corrosion construction. The pillar is passed through the opening, and the opening and the pillar are joined by welding.
The corrosion-preventing structure for a metal column according to claim 4.

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