JP7357374B2 - Fixed member - Google Patents

Description

The present invention relates to a fixing member for fixing a support column to a foundation.

Conventionally, poles used for outdoor lights, road signs, etc. have a base plate attached to the lower end to fix them to the ground. The base plate has a through hole through which the anchor bolt protrudes from the concrete foundation buried in the ground, and by tightening the nut on the anchor bolt that has passed through the through hole, the base plate becomes firmly attached to the concrete foundation. It is fixed (see Patent Document 1).

JP2009-275396A

However, when the above-mentioned base plate is fixed to the concrete foundation, the state of the portion of the anchor bolt protruding from the concrete cannot be confirmed from the outside. Therefore, even if the strength of the anchor bolt were to decrease, it would be difficult to know immediately.

The present invention has been made in view of these circumstances, and one exemplary purpose thereof is to provide a fixing member with a new structure that allows easy inspection of bolts and the like that fix the fixing member.

In order to solve the above problems, a fixing member according to an aspect of the present invention includes a joint portion to which the lower end of a column supporting a structure is joined, and a base portion placed on a foundation. The base portion extends radially outward from the joint portion and has a flange portion in which a through hole is formed through which a bolt protruding from the foundation passes. In the base part, a space is formed between a part of the lower surface of the flange part and the foundation, and the space is connected from the outer edge of the flange part to the lower part of the through hole.

According to this aspect, while the fixing member is fixed to the foundation via the bolt passing through the through hole, a portion of the bolt protruding from the foundation at the lower part of the flange portion of the fixing member can be inspected from the outside.

The space may have a height in the range of 3 to 50 [mm]. This allows the condition of the bolts to be inspected visually using an inspection tool such as a fiberscope without requiring too much space.

The reinforcing portion may further include a flared reinforcing portion having a gentle surface from the joint portion toward the through hole. The reinforcing part may have a thick part formed to surround the through hole. This makes it possible to increase the strength of the flange part, which is suspended from the foundation due to the space.

The thick portion may be provided in an arc shape around the through hole. This makes it difficult for water to accumulate around the through hole.

The base portion may have a first lower surface in contact with the foundation, and a second lower surface that is radially outer than the first lower surface and has a space between it and the foundation. When the height of the space is H [mm], the first lower surface and the second lower surface may be connected by a curved surface with a radius of curvature r [mm] (H-3<R≦H). As a result, when a load is applied to the part of the flange portion that has the second lower surface with a space formed between it and the foundation, stress concentration at the boundary between the first lower surface and the second lower surface occurs. can be alleviated.

In the base portion, the area of the first lower surface in contact with the foundation may be three times or more the area of the second lower surface between which a space is formed between the base portion and the foundation. This makes it possible to perform inspection using the space between the second lower surface and the foundation while ensuring the strength of the first lower surface of the base portion.

The fixing member may be a single piece made of cast iron. This makes it possible to easily manufacture members with complex shapes and partially different thicknesses.

Note that arbitrary combinations of the above-mentioned components and expressions of the present invention converted between methods, devices, systems, etc. are also effective as aspects of the present invention.

According to the present invention, it becomes easy to inspect bolts and the like that fix the fixing member.

FIG. 2 is a schematic diagram showing main parts of a support column including a fixing member according to the present embodiment. FIG. 3 is a perspective view of a fixing member according to the present embodiment. FIG. 3 is a top view of the fixing member shown in FIG. 2 when viewed from direction D1. FIG. 3 is a bottom view of the fixing member shown in FIG. 2 when viewed from direction D2. 4 is a sectional view taken along line AA of the fixing member shown in FIG. 3. FIG. FIG. 4 is a BB sectional view of the fixing member shown in FIG. 3; FIG. 4 is an enlarged view of the area of the fixing member shown in FIG. 3;

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments and with reference to the drawings. Identical or equivalent components, members, and processes shown in each drawing are designated by the same reference numerals, and redundant explanations will be omitted as appropriate. Furthermore, the embodiments are illustrative rather than limiting the invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(post)
The pillars according to this embodiment are for supporting structures, such as structures used in the road traffic field such as guide signs, regulatory signs, signals, information boards, cameras, antennas, communications, etc. It is used to place structures used in the information and communication field and structures used in the lighting field such as roadway lighting and sidewalk lighting at high places. Further, the column includes a column base portion in which a through hole is formed through which an anchor bolt protruding from the foundation passes, and in this embodiment, the fixing member described later corresponds to the column base portion.

FIG. 1 is a schematic diagram showing the main parts of a support column including a fixing member according to the present embodiment. The strut 10 according to this embodiment includes a strut main body 12 and a fixing member 14. The strut body 12 is, for example, a steel pipe with a diameter of 100 to 500 mm and a length (height) of approximately 1000 to 10,000 mm. The fixing member 14 is a member made of ductile cast iron with excellent corrosion resistance. The fixing member 14 and the support main body 12 are firmly joined to each other by friction welding. Furthermore, the fixing member 14 includes a joint portion 16 to which the lower end 12a of the pillar 10 that supports the structure is joined, and a base portion 20 that is placed on a foundation 18 such as concrete.

FIG. 2 is a perspective view of the fixing member according to this embodiment. FIG. 3 is a top view of the fixing member shown in FIG. 2 viewed from the D1 direction. FIG. 4 is a bottom view of the fixing member shown in FIG. 2 viewed from direction D2. FIG. 5 is a sectional view taken along line AA of the fixing member shown in FIG. FIG. 6 is a BB sectional view of the fixing member shown in FIG. 3. FIG. 7 is an enlarged view of region R of the fixing member shown in FIG. 3. FIG.

The base portion 20 of the fixing member 14 is a flange that protrudes radially outward from the cylindrical joint portion 16 and has four through holes 24 through which bolts 22 (see FIG. 1) protruding from the foundation 18 pass. It has a section 20a. By aligning the bolts 22 and the through holes 24, installing the fixing member 14 on the foundation 18, and tightening the nuts 23 to the bolts 22, the column 10 is fixed to the foundation 18 via the fixing member 14. . In the base part 20, a space S is formed between a part of the lower surface of the flange part 20a and the foundation 18, and the space S is connected from the outer edge 20c of the flange part 20a to the lower part of the through hole 24.

As a result, while the fixing member 14 is fixed to the foundation 18 via the bolt 22 passing through the through hole 24, the portion 22a of the bolt 22 protruding from the foundation 18 at the lower part of the flange portion 20a of the fixing member 14 is The neighborhood can be inspected from the outside.

The space S according to this embodiment has a height H in the range of 3 to 50 [mm]. The height H may be 5 mm or more, and the height H may be 25 mm or less. Thereby, the condition of the bolt 22 can be inspected with an inspection instrument such as a fiberscope without increasing the space S so much.

Further, the fixing member 14 is provided with four flared reinforcing portions 26 having smooth and continuous surfaces (without steps) from the joint portion 16 toward each through hole 24 . Thereby, even if an external force is applied to each part of the fixing member 14, stress concentration is less likely to occur in the reinforcing part 26. The reinforcing portion 26 has a height of about 100 to 200 mm from the surface of the flange portion 20a, and a width W (see FIG. 3) of about 100 to 150 mm. Further, the reinforcing portion 26 has a thick portion 26a formed to surround the through hole 24. A portion of the thick portion 26a extends to a region R1 of the flange portion 20a where the space S is formed at the bottom. Thereby, the strength of the flange portion 20a at the portion floating from the foundation 18 due to the space S can be increased.

Further, the thick portion 26a is provided in an arc shape around the through hole 24. In other words, the thick portion 26a is provided so as not to completely surround the through hole 24. As a result, even if water does not come out from the through hole 24 when the bolt 22 is inserted into the through hole 24, water will come out from the part 26b around the through hole 24 where the thick part 26a is not present, so the water will not come out through the through hole 24. Water is less likely to accumulate around the hole 24, and deterioration of the bolt 22 and nut 23 can be reduced.

Further, as shown in FIGS. 3 and 7, the arc-shaped thick portion 26a is located on the outer side of the straight line L2 that is orthogonal to the straight line L1 connecting the center O1 of the cylindrical joint 16 and the center O2 of the through hole 24. It extends to The angle α formed by the tip 26c of the arc-shaped thick portion 26a, the center O2 of the through hole 24, and the center O1 of the joint portion 16 is greater than 90°, preferably 100° or more. Furthermore, in order to prevent water from accumulating around the through hole 24 as described above, the angle α is less than 180°, preferably 135° or less. As a result, since the thick portion 26a is provided to surround the bolt 22 and nut 23, it becomes difficult for pedestrians, bicycles, etc. to directly touch the bolt 22 and nut 23 protruding from the through hole 24.

The base portion 20 also has a first lower surface 20b that is in contact with the foundation 18, and a second lower surface 20d that is radially outer than the first lower surface 20b and has a space S between it and the foundation 18. ,have. When the height of the space is H [mm], the first lower surface 20b and the second lower surface 20d are connected by a curved surface 20g with a radius of curvature r [mm] (H-3<r≦H). That is, when the height H of the space S is 12 mm, the radius of curvature r is preferably greater than 9 mm and less than or equal to 12 mm. As a result, when a load is applied to the portion of the flange portion 20a having the second lower surface 20d between which the space S is formed and the foundation 18, the first lower surface 20b and the second lower surface 20d The stress concentration at the boundary can be alleviated.

Further, in the base portion 20 according to the present embodiment, the thickness t of the flange portion 20a at the portion where the second lower surface 20d is formed is approximately 0.8 to 1.5 times the height H of the space S. It is.

Further, as shown in FIG. 2, the flat portion 20e between the reinforcing portions 26 of the flange portion 20a has a first lower surface 20b in contact with the foundation 18 and a side surface 20f continuous with the first lower surface 20b. have The side surface 20f is an arc-shaped curved surface concave toward the center O1 of the joint portion 16, and its radius of curvature is 200 to 300 mm.

In addition, in the fixing member 14 according to the present embodiment, if the area S1 is a certain value or more, the support column 10 can be firmly fixed to the ground surface, but if the area S1 is too large, a space between the base 18 and The area S2 of the second lower surface 20d where the space S is formed becomes relatively small, making it difficult to inspect the bolt 22 through the space S. Therefore, in the base part 20, the area S1 of the first lower surface 20b in contact with the foundation 18 is 3 times or more and less than 6 times the area S2 of the second lower surface 20d between which the space S is formed and the foundation 18. Good to have. The area S1 is, for example, in the range of 14,500 to 29,000 mm ² , and the area S2 is, for example, in the range of 4,400 to 7,600 mm ² . This makes it possible to perform inspection using the space S between the second lower surface 20d and the foundation 18 while ensuring the strength of the first lower surface 20b of the base portion 20.

Further, since the fixing member 14 according to the present embodiment is a single component made of cast iron, it can be easily manufactured with high precision even if it has a complicated shape with a gently curved surface or a shape with partially different thicknesses. . Further, if the space S is configured with a fixing member having a divided structure (multiple parts), there is a risk that sufficient strength cannot be ensured, but by configuring the fixing member with an integral structure (one piece), sufficient strength can be ensured. Further, in a fixed member having a split structure, gaps between parts may promote corrosion deterioration, but by configuring the fixed member in an integral structure, corrosion deterioration can be suppressed.

Although the present invention has been described above with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments, and may also be applied to combinations or substitutions of the configurations of the embodiments as appropriate. It is included in the present invention. Furthermore, it is possible to appropriately rearrange the combinations and order of processing in the embodiments based on the knowledge of those skilled in the art, and to make various modifications to the embodiments, such as various design changes. Such embodiments may also be included within the scope of the present invention.

10 strut, 12 strut body, 12a lower end, 14 fixing member, 16 joint, 18 foundation, 20 base, 20a flange, 20b first lower surface, 20c outer edge, 20d second lower surface, 20e flat part, 20f side surface , 22 bolt, 23 nut, 24 through hole, 26 reinforcement part, 26a thick part, 26b part, 26c tip, H height, L1 straight line, L2 straight line, O1 center, O2 center, R area, R1 area, S space , S1 area, S2 area, W width, r radius of curvature, t thickness.

Claims (6)

A joint where the lower ends of columns supporting the structure are joined;
a base portion placed on the foundation;
The base portion has a flange portion that protrudes radially outward from the joint portion and is formed with a through hole through which a bolt protruding from the foundation passes;
The base part has a space formed between a part of the lower surface of the flange part and the foundation,
The space is connected from the outer edge of the flange portion to the bottom of the through hole,
further comprising a flared reinforcing portion configured with a gentle surface from the joint portion toward the through hole,
The fixing member is characterized in that the reinforcing part has a thick part formed to surround the through hole . The fixing member according to claim 1, wherein the space has a height in a range of 3 to 50 [mm]. The fixing member according to claim 1 or 2 , wherein the thick portion is provided in an arc shape around the through hole. The base portion has a first lower surface that is in contact with the foundation, and a second lower surface that is radially outer than the first lower surface and has the space formed between it and the foundation. ,
When the height of the space is H [mm], the first lower surface and the second lower surface are connected by a curved surface with a radius of curvature r [mm] (H-3<R≦H). The fixing member according to any one of claims 1 to 3 . 1. The area of the first lower surface of the base portion that is in contact with the foundation is three times or more the area of the second lower surface between which the space is formed between the base portion and the foundation. The fixing member according to any one of items 3 to 3 . The fixing member according to any one of claims 1 to 5 , characterized in that it is a one-piece piece made of cast iron.

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