JP2008002109A - Base structure of metal pipe column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base structure of a metal pipe column which can improve the corrosive environment of a lower portion and a base portion of the metal pipe column, and contributes to the enhanced durability of a metal pipe. <P>SOLUTION: The base structure is constituted by inserting a projected portion of each anchor bolt 6 having one end thereof protruded from a foundation upper surface 5 and the other end thereof embedded in a foundation 4 into an anchor bolt insertion hole 13 formed at a base plate 2, fastening the base plate 2 with fastening nuts 7, and erecting the metal pipe column 1 on the base plate 2 via a column base fitting 3. In the base structure of the metal pipe column 1, the base plate 2 set on the foundation upper surface 5, the column base fitting 3, and the projected portion of each anchor bolt 6 projected from the base plate, and the fastening nut 7 are covered with corrosion preventive concrete 9 except for the upper end of the column base fitting 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a base structure of a metal tube column used for an illumination column, a signal column, a sign column, and the like, and more particularly, a base structure for standing a metal tube column on a foundation via a base plate and a column base metal. About.

  Metal tube columns used for lighting columns, signal columns, sign columns, etc. that are erected along the road are mounted on the foundation through a base plate that is attached to the lower part by connecting means such as welding and screwing. It is erected by fixing. As the fixing method, by inserting the protruding part of the anchor bolt with one end protruding from the top of the foundation and the other end embedded in the base into the anchor bolt insertion hole drilled in the base plate, and tightening with the tightening nut, It is known to fix a base plate on a foundation. At this time, the base portion of the metal tube column is also reinforced by providing a reinforcing rib plate at the lower portion of the metal tube column or by providing a column base between the lower portion of the metal tube column and the base plate. .

  Patent Document 1 discloses a base structure of a metal tube column in which a base plate is fixed on a foundation using a plurality of anchor bolts. As disclosed in FIG. 4 of Patent Document 1, when the metal tube column is erected by attaching the lower portion of the metal tube column to the base plate by welding, the triangular rib plate is connected to the lower portion of the metal tube column and the base plate. It is common to reinforce the base of the metal tube column by providing it between the two.

  FIG. 15 shows an example (conventional example) of a base structure of a metal tube column in which a triangular rib plate is provided between a lower portion of the metal tube column and a base plate. The base plate 2 is mounted on the foundation 4 and fixed by fastening each anchor bolt 6 protruding upward from the foundation top end 5 of the foundation 4 with two fastening nuts 7 via a plain washer 8. ing. And the metal pipe pillar 1 is joined with the base plate 2 by performing the circumference welding W to the outer periphery of the lower end part. Further, four triangular rib plates 19 are vertically provided above the base plate 2 to reinforce the lower portion of the metal tube pillar 1.

JP 2004-137780 A

  However, in the base structure of the metal tube column provided with the reinforcing rib plate at the lower part of the metal tube column, the metal tube column, the base plate provided on the base top end, and the protruding portion of the anchor bolt protruding on the base plate And the tightening nut is raining. Also, instead of reinforcing with the rib plate, the base of the metal tube column can be reinforced by providing a column base between the lower part of the metal tube column and the base plate. Even in the structure, the metal pipe column, the base plate and the column base provided on the top of the foundation, the protruding portion of the anchor bolt protruding on the base plate, and the tightening nut are exposed to rain. In any case, it is easy to make a rainwater pool on the foundation of the metal pipe column every time it rains.

  Therefore, in the case of the base structure of the metal tube column provided with the column base metal part between the lower part of the metal tube column and the base plate, the lower part of the metal tube column, the base plate, the column base metal object, and the anchor bolt protruding on the base plate are provided. The protruding portion and the tightening nut are easily submerged in the rainwater pool. Further, every time rain falls, rainwater enters between the base plate and the top of the foundation and stagnates around the anchor bolt at the level of the top of the foundation.

  For the lower part of the metal pipe column, by designing the height of the upper end of the column base hardware so that the water surface level of the rainwater puddle is below the level of the connection part of the metal pipe column and the column base metal part, It is possible to prevent the lower part of the metal tube column from being submerged in the rainwater pool. However, with respect to the base plate and the column base metal, and the protruding portion of the anchor bolt and the tightening nut protruding on the base plate, they cannot be submerged. In addition, it is impossible to prevent rainwater from entering between the base plate and the top of the foundation.

  As described above, even in the base structure of the metal tube column including the column base metal member between the lower part of the metal tube column and the base plate, the base plate, the column base metal component, the anchor bolt, and the tightening nut are easily corroded. Since metal pipe columns, base plates, column bases, anchor bolts, and tightening nuts are all made of steel, such corrosion tends to proceed and the metal tube columns collapse in strong winds and the like. There is a problem of fear.

  In particular, corrosion around the level of the top of the foundation of the anchor bolt is difficult to inspect after the metal pipe column is erected, so that it is difficult to find out and the progress of corrosion tends to be neglected. Therefore, the corrosion around the level of the basic top end of the anchor bolt is a particularly serious problem.

  An object of the present invention is to provide a base structure of a metal tube column that can improve the corrosive environment of the base portion of the metal tube column and improve the durability of the metal tube column.

  The inventors of the present invention have made extensive experiments and examinations in order to improve the corrosive environment of the metal tube column base and to improve the durability of the metal tube column. As a result, the following findings (a) to (h) were obtained.

  (a) In the conventional metal tube column base, corrosion occurs around the level of the foundation top of the anchor bolt. Rainwater enters from between the foundation top and the base plate and stagnates around the anchor bolt. Therefore, by putting concrete for anti-corrosion on the top of the foundation including the base plate, and covering the entire base plate with concrete, the intrusion route of rainwater between the foundation top and the base plate is cut off. That's fine.

  In addition, regarding the corrosion of the base plate and the protruding portion of the anchor bolt protruding on the base plate and the fastening nut, including not only the base plate but also the protruding portion of the anchor bolt protruding on the base plate and the tightening nut, If concrete is stretched for corrosion prevention and the whole is covered with concrete, contact with rainwater can be cut off even if the metal tube column base is submerged in the rainwater reservoir.

  (b) For the lower part of the metal pipe column, the base structure of the metal pipe column with column base hardware is adopted between the lower part of the metal tube column and the base plate, and the water surface level of the rainwater puddle is adjusted between the metal pipe column and the column base. By designing the height of the upper end portion of the column base metal so as to be lower than the level of the connection portion of the hardware, the lower portion of the metal tube column may be prevented from being submerged in the rainwater pool. Although the base plate and the column base metal may be formed separately and joined to each other, it is preferable that the base plate and the column base are integrated by molding both at once. And it is preferable to join a metal pipe column and column base metal by welding. For example, the metal pipe column and the column base metal are joined by welding by inserting the lower end of the metal tube column inside the upper end of the column base metal, between the upper end of the column base metal and the outer periphery of the metal tube column, and the metal This can be done by performing fillet welding between the lower end of the tube column and the inner periphery of the column base. Alternatively, after forming a fitting portion on the outer periphery of the upper end portion of the column base metal, extrapolate the lower end of the metal tube column to the fitting portion, and fillet between the lower end of the metal tube column and the outer periphery of the column base metal This can be done by welding.

  It is preferable to design the level height of the upper end portion of the column base metal so that the water level of the rainwater pool is lower than the level of the outer peripheral connection portion between the metal pipe column and the column base metal. The level difference between the two is preferably 25 mm or more, more preferably 50 mm or more. Then, the lower end of the metal tube column is inserted inside the upper end of the column base metal, and between the upper end of the column base metal and the outer periphery of the metal tube column, and between the lower end of the metal tube column and the inner periphery of the column base metal When joining by fillet welding to the metal, the water surface level of the rainwater puddle can be increased, so when joining the metal pipe column and the column base metal by welding, it is inside the upper end of the column base metal. It is preferable to interpolate the lower end of the metal tube column.

  (c) As for the column base, the outer surface of the lower end of the column base integrated with the base plate is not only on the base plate, but also on the protruding portion of the anchor bolt protruding on the base plate and the tightening nut. Because it is covered with anti-corrosive concrete that stretches on the surface, contact with rainwater can be cut off even if it is submerged in a rainwater pool.

  However, the anticorrosion concrete cannot be stretched to the upper end of the column base metal. In order to prevent the corrosion of the lower part of the metal pipe column, rainwater is applied to the top surface of the anticorrosion concrete so that the level of the rainwater pool formed during the rain does not exceed the level of the outer peripheral connection part between the metal pipe column and the column base metal. This is because it is necessary to lower the level of the top surface of the anticorrosive concrete to be stretched.

  Therefore, the outer surface of the upper end portion of the column base metal member, to which the anticorrosion concrete is not stretched, must be submerged in the rainwater pool formed during the rain, and thus is easily corroded. On the other hand, the lower part of the metal pipe column can be prevented from being submerged in the rainwater pool. Therefore, it is preferable that the outer surface of the upper end portion of the column base metal is made thicker than the thickness of the metal tube column in consideration of the corrosion allowance (thinning due to corrosion).

  What is necessary is just to design the level of the upper surface of corrosion-proof concrete so that the protrusion part of an anchor bolt and the clamping nut which protruded on the base plate may be covered completely.

  In addition, in order to prevent cracking of the anticorrosive concrete, a plurality of reinforcing bars crossed in a plane may be incorporated into the anticorrosive concrete. Alternatively, a wire net-shaped “lass” may be incorporated in the anticorrosive concrete.

  (d) The level of rainwater pools formed on the foundation during rainfall depends not only on the level of the top surface of the anticorrosive concrete, but also on the level of the ground around the foundation where the metal pipe columns are erected. . That is, if the level of the top surface of the anti-corrosion concrete is lower than the level of the surrounding ground, a lot of rainwater tends to collect, and if the level of the top surface of the anti-corrosion concrete is equal to or higher than the level of the surrounding ground, the rainwater Must be taken into account.

  Therefore, when designing the shape of the column base hardware, the maximum level of the rain pool is assumed, taking into account the level of the top surface of the anti-corrosion concrete and the level of the ground around the foundation where the metal pipe column is erected. However, it is necessary to determine the height of the column base metal so that the assumed maximum level does not exceed the level of the outer peripheral connection portion at the upper end of the metal tube column and the column base metal.

  (e) The shape of the fastening nut screwed into the anchor bolt protruding upward from the base plate is not particularly limited, and may be a hexagonal shape or other polygonal shapes. The number of tightening nuts may be one for one anchor bolt protrusion, but it is preferable to use two. When two tightening nuts are used, loosening of the tightening nut can be prevented.

  However, if two tightening nuts are screwed in, the protruding portion from the base plate must be lengthened accordingly. As described above, the level of the top surface of the anticorrosive concrete needs to be such that the protruding portion of the anchor bolt protruding on the base plate and the tightening nut are completely covered. The thickness of the anti-corrosion concrete is increased, and the water level of the rainwater pool formed during the rain rises accordingly, so it is necessary to increase the level of the outer peripheral connection part between the metal pipe column and the column base hardware. Become.

  In order to avoid such an inconvenience, instead of using two tightening nuts, one tightening nut and a loosening prevention fitting may be used for tightening. This is because the thickness of the anticorrosion concrete can be reduced as the protruding portion on the base plate becomes shorter, and as a result, the level of the outer peripheral connection portion between the metal tube column and the column base metal can be reduced.

  As the loosening prevention metal fitting, for example, it has a shape that fits at least one part of the outer side surface of the nut on the inner surface and has an extension or projection on the outer periphery, and this extension or projection is What is necessary is just to fix and use to a baseplate.

  (f) Above, insert the protruding part of the anchor bolt with one end protruding above the top of the foundation and the other end embedded in the foundation and tighten it with the tightening nut. It is related with the base part structure of the metal pipe pillar which covers with the corrosion prevention concrete except for the upper end part of a column base metal.

  However, it is also possible to screw the high nut halfway into one end of the anchor bolt and tighten the high nut with the tightening bolt instead of causing the anchor bolt to protrude above the base top end and tightening the protruding portion with the tightening nut. At this time, if the high nut is screwed in advance after screwing the locking nut into the anchor bolt in advance, the high nut can be prevented from loosening and the screwing level of the high nut can be adjusted. It is preferable to use a nut.

  In this way, anchor bolts, in which a high nut is screwed halfway into one end, are embedded in the foundation so that the level of the upper end of the high nut matches the level of the top of the foundation, and tightened in the base plate. Align the bolt insertion holes, insert the base plate, and tighten the bolts between the high nuts screwed into the anchor bolts and cover them with anti-corrosion concrete except for the upper ends of the column base hardware. It is good also as the base structure of the metal pipe pillar formed.

  At this time, except for the upper end portion of the column base metal, the base plate and the column base metal installed on the top of the foundation and the head of the fastening bolt protruding on the base plate are covered with the corrosion preventing concrete. Since only the heads of the fastening bolts protrude on the base plate, the thickness of the anticorrosion concrete can be reduced correspondingly, and as a result, the level of the outer peripheral connection part between the metal tube column and the column base metal is lowered. be able to.

  (g) The shape of the head of the fastening bolt that is screwed into the high nut from above the base plate is not particularly limited, and may be a hexagonal shape or other polygonal shapes. Moreover, in order to prevent the bolt from loosening, a loosening prevention fitting may be used.

  (h) The foundation for erecting the metal pipe column through the base plate and the leg column hardware may be formed by pouring concrete with the anchor bolt protruding upward. The foundation may be newly installed or may be installed on an existing foundation provided with an existing anchor bolt protruding upward from the top of the foundation.

  The present invention has been made on the basis of the above findings, and the gist thereof lies in the base structure of the metal pipe column described in (1) to (5) below.

  (1) A base plate that has one end protruding above the top of the foundation and the other end embedded in the anchor bolt is inserted into the anchor bolt insertion hole drilled in the base plate and tightened with a tightening nut. A base structure for standing a metal tube column thinner than the column base metal via the column base metal, and the base plate and the column base metal mounted on the top of the foundation and the anchor bolt protruding on the base plate The base structure of a metal tube column in which the protruding portion and the fastening nut are covered with anti-corrosion concrete except for the upper end portion of the column base metal.

  (2) The metal tube column base structure according to (1) above, wherein the tightening nut is provided with a loosening prevention fitting.

  (3) An anchor bolt, in which a high nut is screwed halfway into one end, is embedded in the foundation so that the level of the upper end of the high nut matches the level of the top of the foundation, and a tightening bolt drilled in the base plate Insert the base plate after aligning the insertion holes, and tighten the bolts between the high nuts screwed into the anchor bolts, and connect the metal tube columns that are thinner than the column base hardware to the base plates. Base structure for standing on the foundation, preventing corrosion of the base plate and column base hardware installed on the top of the foundation, and the head of the tightening nut protruding on the base plate, except for the top end of the column base metal Base structure of a metal tube column covered with concrete.

  (4) The base structure of a metal pipe column according to (3) above, wherein the fastening bolt is provided with a loosening prevention fitting.

  (5) The base structure of the metal pipe column according to any one of (1) to (4) above, wherein the base plate and the column base metal are integrated.

  The base structure of the metal tube column according to the present invention includes a base plate and a column base hardware installed on the top of the foundation, and a protruding portion and a fastening nut of an anchor bolt protruding on the base plate, except for an upper end portion of the column base metal. Covered with anti-corrosion concrete. Alternatively, the base plate and the column base metal installed on the top of the foundation and the heads of the fastening bolts protruding on the base plate are covered with the corrosion prevention concrete except for the upper end of the column base metal.

  Therefore, since rainwater does not enter between the base plate and the top of the foundation during rain, corrosion around the level of the foundation top of the anchor bolt can be prevented. Moreover, even if a rainwater pool is formed on the foundation of the metal tube column and the base structure of the metal tube column is submerged in the rainwater pool, the base of the metal tube column can be prevented from being corroded. The durability of can be improved. Furthermore, the outer surface of the upper end of the column base metal is expected to have corrosion allowance, and the thickness of the upper end of the column base metal is made thicker than the wall thickness of the metal tube column to form the corrosion allowance. Even if the outer surface of the upper end of the column base metal that is not stretched is submerged in a rainwater pool formed during rainfall, it is difficult to corrode.

  Moreover, the base structure of the metal pipe column concerning this invention may newly install a foundation, and may install it on it, and may install it on the existing foundation.

  Hereinafter, the base part structure of the metal pipe column concerning this invention is demonstrated using drawing. In addition, this invention is not limited to an Example.

  FIG. 1 is a longitudinal sectional view showing an example of a base structure of a metal tube column according to the present invention.

  With one end of the four anchor bolts 6 protruding above the foundation top end and the other end embedded in the foundation, the concrete is poured so that the foundation top end 5 is at the same level as the ground GL. Form the foundation 4. The anchor bolts 6 are fixed to each other in the foundation 4 by anchor bolt connecting members 11. The protrusion of the anchor bolt 6 is aligned with the anchor bolt insertion hole 13 formed in the base plate 2 integrated with the column base metal 3 and inserted into the base plate 2. Then, the flat washer 8 is fitted to the anchor bolt 6 projecting upward from the base plate 2, then two outer hexagonal tightening nuts 7 are screwed in, and both of them are tightened to fix the base plate 2 to the base top end 5 of the base 4. Secure on top. Thereafter, the base plate 2, the column base metal 3, and the protruding portion of the anchor bolt 6 protruding on the base plate and the tightening nut 7 are covered with the corrosion prevention concrete 9 except for the upper end of the column base metal 3. In the middle of this, a wire mesh lath 16 is stretched horizontally in the anticorrosive concrete. Then, the metal tube column 1 is erected by screwing it into the column base 2 from above.

  In this case, the lower end of the metal tube column is inserted inside the upper end of the column base metal, and between the upper end of the column base metal and the outer periphery of the metal tube column, and the lower end of the metal tube column and the inner periphery of the column base metal The metal tube column and the column base metal are joined by performing fillet welding between the metal tube column and the bottom end of the metal tube column. You may join by carrying out fillet welding between the lower end of a metal pipe column, and the outer periphery of a column base metal fitting by extrapolating to a fitting part. Moreover, although the wire mesh-shaped lath 16 is not necessarily required, the effect of preventing cracking of the anticorrosive concrete can be obtained by stretching the lath. Instead of the lath, a crossing of a plurality of reinforcing bars may be incorporated in the anticorrosion concrete.

  Thus, since the base plate, the protruding portion of the anchor bolt protruding on the base plate, and the tightening nut are covered with the corrosion-preventing concrete 9, rainwater does not enter between the top of the foundation and the base plate when it rains. . In addition, even if the metal pipe column base is submerged in a rainwater pool formed by rainfall, the water level of the rainwater pool is lower than the level of the connection between the metal tube column and the column base hardware. If the height of the upper end is designed, the lower part of the metal tube column can be prevented from being submerged in the rainwater reservoir, so that the metal tube column base is the rainwater reservoir except for the outer surface of the upper end of the column base hardware. Can break contact with. That is, even if the metal tube column base is submerged in a rainwater reservoir formed by rainfall, the metal tube column, the base plate, the protruding portion of the anchor bolt protruding on the base plate, and the tightening nut may break the contact with the rainwater reservoir. it can. Therefore, the corrosive environment of the base portion of the metal pipe column can be greatly improved. However, for the column base hardware, the lower part of the column base hardware is covered with anti-corrosion concrete so that contact with the rain water pool can be cut off, but the outer surface of the upper end of the column base hardware may be submerged in the rain water pool. In consideration of the corrosion allowance, the thickness of the wall at the upper end of the column base metal is preferably made thicker than the thickness of the metal tube column.

  The planar shape of the base plate 2 is a hollow circle or a polygon at the center, and the outer shape is a polygon or a circle such as a quadrangle or a hexagon. Moreover, a steel pipe, an aluminum pipe, etc. can be used for a metal pipe. In addition to a circular tube, a polygonal tube such as a quadrangular shape, a hexagonal shape, or an octagonal shape can be used as the shape.

  In addition, here, four anchor bolts 6 are used in which one end protrudes from the top of the foundation and the other end is embedded in the foundation. However, the number of anchor bolts 6 is not particularly limited. Can be increased or decreased as appropriate. In this case, the tightening nut 7 has a hexagonal shape, but is not particularly limited, and may have another polygonal shape.

  FIG. 2 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  There is no difference from Example 1 except that the foundation 4 is formed at a level higher than the ground GL and the lath is not incorporated in the anticorrosive concrete. However, since the base top 5 is at a level higher than the ground GL, and therefore, the top surface of the anticorrosive concrete is also at a level higher than the ground GL, it is difficult for rainwater to collect on the anticorrosive concrete 9 during rainfall. There are advantages.

  Thus, like Example 1, the corrosive environment of the base part of a metal pipe column can be improved significantly.

  FIG. 3 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  There is no difference from Example 1 except that the foundation 4 is formed at a level lower than the ground GL and the top surface of the anticorrosion concrete 9 is formed at the same level as the ground GL.

  As long as the maximum level of the water surface of the rainwater pool formed during rainfall does not exceed the level of the outer peripheral connection part at the upper end of the column base metal, the lower part of the metal tube column will not be submerged. Therefore, the corrosive environment at the base of the metal tube column can be greatly improved. Further, since the upper surface of the anticorrosion concrete 9 is formed at the same level as the ground GL, there is no possibility that a pedestrian or the like will trip over the anticorrosion concrete or hook clothes.

  FIG. 4 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  With one end of the four anchor bolts 6 protruding above the foundation top end and the other end embedded in the foundation, the concrete is poured so that the foundation top end 5 is at the same level as the ground GL. Form the foundation 4. The anchor bolts 6 are fixed to each other in the foundation 4 by anchor bolt connecting members 11. The protrusion of the anchor bolt 6 is aligned with the anchor bolt insertion hole 13 formed in the base plate 2 integrated with the column base metal 3 and inserted into the base plate 2. Then, after fitting the plain washer 8 on the anchor bolt 6 projecting upward from the base plate 2, one hexagonal tightening nut 7 is screwed in and tightened, and the base plate 2 is placed on the base top end 5 of the base 4. Fix it. Thereafter, in order to prevent the tightening nut 7 from being loosened, the loosening prevention metal fitting 17 is attached to the outer periphery of the tightening nut 7, and then the base plate 2, the column base metal 3, the protruding portion of the anchor bolt 6 protruding on the base plate and the tightening nut 7 are attached. The upper part of the column base 3 is covered with the corrosion prevention concrete 9. In the middle of this, a wire mesh lath 16 is stretched horizontally in the anticorrosive concrete. Compared to the first embodiment, the length of the protruding portion above the anchor bolt 6 can be made shorter, and therefore the thickness of the corrosion-preventing concrete 9 can be made thinner.

  And here, the lower end of the metal tube column is inserted inside the upper end of the column base metal, and between the upper end of the column base metal and the outer periphery of the metal tube column, and the lower end of the metal tube column and the inner periphery of the column base metal The metal tube column and the column base metal are joined by performing fillet welding between the metal tube column and the bottom end of the metal tube column. You may join by carrying out fillet welding between the lower end of a metal pipe column, and the outer periphery of a column base metal fitting by extrapolating to a fitting part. Moreover, although the wire mesh-shaped lath 16 is not necessarily required, the effect of preventing cracking of the anticorrosive concrete can be obtained by stretching the lath. Instead of the lath, a crossing of a plurality of reinforcing bars may be incorporated in the anticorrosion concrete.

  In this way, as in the first embodiment, the base plate, the protruding portion of the anchor bolt that protrudes on the base plate, and the tightening nut are covered with the corrosion-preventing concrete 9, so that it is between the base top and the base plate during rainfall. Rainwater will not enter. In addition, even if the metal pipe column base is submerged in a rainwater pool formed by rainfall, the water level of the rainwater pool is lower than the level of the connection between the metal tube column and the column base hardware. If the height of the upper end is designed, the lower part of the metal tube column can be prevented from being submerged in the rainwater reservoir, so that the metal tube column base is the rainwater reservoir except for the outer surface of the upper end of the column base hardware. Can break contact with. That is, even if the metal tube column base is submerged in a rainwater reservoir formed by rainfall, the metal tube column, the base plate, the protruding portion of the anchor bolt protruding on the base plate, and the tightening nut may break the contact with the rainwater reservoir. it can. Therefore, the corrosive environment of the base portion of the metal pipe column can be greatly improved. However, for the column base hardware, the lower part of the column base hardware is covered with anti-corrosion concrete so that contact with the rain water pool can be cut off, but the outer surface of the upper end of the column base hardware may be submerged in the rain water pool. In consideration of the corrosion allowance, the thickness of the wall at the upper end of the column base metal is preferably made thicker than the thickness of the metal tube column.

  The planar shape of the base plate 2 is a hollow circle or a polygon at the center, and the outer shape is a polygon or a circle such as a quadrangle or a hexagon. Moreover, a steel pipe, an aluminum pipe, etc. can be used for a metal pipe. In addition to a circular tube, a polygonal tube such as a quadrangular shape, a hexagonal shape or an octagonal shape can be used as the shape.

  In addition, here, four anchor bolts 6 are used in which one end protrudes from the top of the foundation and the other end is embedded in the foundation. However, the number of anchor bolts 6 is not particularly limited. Can be increased or decreased as appropriate. In this case, the tightening nut 7 has a hexagonal shape, but is not particularly limited, and may have another polygonal shape.

  FIG. 5 shows an example of the relaxation preventing metal fitting 17 and is a partially enlarged view of the relaxation preventing metal fitting 17 and its periphery in FIG. (a) is a top view, and (b) is a longitudinal sectional view.

  The loosening prevention hardware 17 has a hole shape that fits to the outer surface of the hexagonal tightening nut 7 on the inner surface 20 thereof, and includes an extension 22 on the outer periphery thereof. The inner surface 20 is fitted to the outer surface of the tightening nut 7, and the extension 22 is fixed to the base plate 2 by a fixing bolt 21 of a loosening prevention metal fitting.

  Here, a fixing rivet may be used instead of the fixing bolt to fix the extended portion 22 on the outer periphery of the loosening prevention hardware to the base plate. The base plate 2 has holes for insertion of fixing bolts or fixing rivets, through which the fixing bolts or fixing rivets are passed through the insertion holes provided in the extension of the anti-loosening hardware. An anti-loosening hardware is fixed to the base plate. The hole for inserting the fixing bolt or the fixing rivet may be drilled in the base plate in advance, or may be drilled in the base plate at the enforcement site.

  Note that the hole on the inner surface 20 of the anti-loosening hardware 17 and the outer surface of the tightening nut 7 need to have shapes that can be fitted to each other, but the rotation of the tightening nut 7 is caused by the rotation of the anti-loosening hardware 17 fixed to the base plate 2. It is only necessary to be blocked by the hole in the inner surface 20, and there may be a little play at the time of fitting. The loosening prevention hardware 11 is fixed to the base plate 2 through a fixing bolt (or fixing rivet) 12 in a hole provided in the extension portion 9, but attachment work is easier if there is play in the fitting portion. Therefore, it is preferable to have a shape in which a certain amount of play exists in the fitting portion.

  In this case, a hexagonal nut is used as the tightening nut, but it is not particularly limited, and other polygonal shapes may be used. And the hole on the inner surface of the anti-loosening metal fitting to this tightening nut is a hexagonal shape here, but other polygonal shapes may be used according to the shape of the hole on the inner surface of the anti-loosening hardware. . The shape of the hole on the inner surface of the anti-loosening hardware and the shape of the outer surface of the tightening nut do not have to be exactly the same, and the rotation of the tightening nut is blocked by the hole on the inner surface of the anti-loosening hardware fixed to the base plate. Therefore, the hole on the inner surface of the loosening prevention hardware when the tightening nut has a hexagonal shape may have a double-decagonal shape.

  FIG. 6 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  The base 4 is formed at a level higher than the ground GL and the fitting portion is formed on the outer periphery of the upper end of the column base metal, and the lower end of the metal tube column is extrapolated to the fitting portion. There is no difference from Example 4 except that the fillet weld is applied between the lower end of the metal tube column and the outer periphery of the column base metal, and the metal tube column and the column base metal are joined. However, since the base top 5 is at a level higher than the ground GL, and therefore, the top surface of the anticorrosive concrete is also at a level higher than the ground GL, it is difficult for rainwater to collect on the anticorrosive concrete 9 during rainfall. There are advantages.

  Thus, like Example 4, the corrosive environment of the base part of a metal pipe column can be improved significantly.

  FIG. 7 shows another example of the relaxation preventing metal fitting 17 and is a partially enlarged view of the relaxation preventing metal fitting 17 and its periphery in FIG. (a) is a top view, and (b) is a longitudinal sectional view.

  The anti-loosening hardware 17 is an embodiment except that the inner surface 20 is shaped to fit into the three corners of the hexagonal tightening nut 7 and that two fixing bolts 21 are used. Same as 4. In this way, if a part of the corner portion can be fitted, the nut can be prevented from loosening. Therefore, the shape of the inner surface 4 of the anti-loosening hardware need not be the same as the outer surface shape of the tightening nut.

  Here, a fixing rivet may be used instead of the fixing bolt to fix the extended portion 22 on the outer periphery of the loosening prevention hardware to the base plate. Moreover, the hole for inserting the fixing bolt or the fixing rivet may be drilled in the base plate in advance, or may be drilled in the base plate at the enforcement site. Note that a slight play may exist between the hole on the inner surface 20 of the loosening prevention hardware 17 and the outer surface of the tightening nut 7 during fitting.

  In this case, a hexagonal nut is used as the tightening nut, but it is not particularly limited, and other polygonal shapes may be used. And the hole on the inner surface of the anti-loosening metal fitting to this tightening nut is a hexagonal shape here, but other polygonal shapes may be used according to the shape of the hole on the inner surface of the anti-loosening hardware. . The shape of the hole on the inner surface of the anti-loosening hardware and the shape of the outer surface of the tightening nut do not have to be exactly the same, and the rotation of the tightening nut is blocked by the hole on the inner surface of the anti-loosening hardware fixed to the base plate. Therefore, the hole on the inner surface of the loosening prevention hardware when the tightening nut has a hexagonal shape may have a double-decagonal shape.

  FIG. 8 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  There is no difference from Example 4 except that the foundation 4 is formed at a level lower than the ground GL and the top surface of the anticorrosion concrete 9 is formed at the same level as the ground GL.

  As long as the maximum level of the water surface of the rainwater pool formed during rainfall does not exceed the level of the outer peripheral connection part at the upper end of the column base metal, the lower part of the metal pipe column will not be submerged. Therefore, the corrosive environment at the base of the metal tube column can be greatly improved. Further, since the upper surface of the anticorrosion concrete 9 is formed at the same level as the ground GL, there is no possibility that a pedestrian or the like will trip over the anticorrosion concrete or hook clothes.

  FIG. 9 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  Screw the locking nut 18 into the anchor bolt from one end of the four anchor bolts 6 and screw the high nut 10 partway into the anchor bolt 6. The upper end of the high nut 10 matches the level of the base top 5 In this manner, the foundation top 5 is at the same level as the ground GL in a state where it is embedded in the foundation 4 and the other ends of the four anchor bolts 6 are buried below the foundation 4. The concrete 4 is poured into the foundation 4. The anchor bolts 6 are fixed to each other in the foundation 4 by anchor bolt connecting members 11. A fastening bolt insertion hole 14 formed in the base plate 2 integrated with the column base 3 is aligned with the upper end of the high nut 10, and the base plate 2 is placed on the base top end 5 including the upper end of the high nut 10. Is placed. Then, an outer hexagonal fastening bolt 12 is screwed into the high nut 10 via the plain washer 8 and fastened to fix the base plate 2 on the foundation top end 5 of the foundation 4.

  Thereafter, the base plate 2, the column base metal 3, and the heads of the fastening bolts 12 protruding on the base plate are covered with the corrosion prevention concrete 9 except for the upper end portion of the column base metal 3. Since only the head of the fastening bolt 12 protrudes above the base plate 2 and the protruding length is short, the thickness of the corrosion-preventing concrete 9 can be further reduced as compared with the fourth embodiment. Then, the metal tube column 1 is erected by screwing it into the column base 2 from above.

  In this case, the lower end of the metal tube column is inserted inside the upper end of the column base metal, and between the upper end of the column base metal and the outer periphery of the metal tube column, and the lower end of the metal tube column and the inner periphery of the column base metal The metal tube column and the column base metal are joined by performing fillet welding between the metal tube column and the bottom end of the metal tube column. You may join by carrying out fillet welding between the lower end of a metal pipe column, and the outer periphery of a column base metal fitting by extrapolating to a fitting part. Further, in order to prevent cracking of the anticorrosive concrete, a wire mesh lath may be stretched horizontally in the anticorrosive concrete. Alternatively, the effect of preventing cracking of the anticorrosive concrete can be obtained by incorporating a crossing of a plurality of reinforcing bars in a plane instead of the lath into the anticorrosive concrete.

  In addition, here, when the high nut 10 is screwed into the middle of one end of the anchor bolt 6, the locking nut 18 is screwed in advance, but the screwing of the locking nut 18 may be omitted. However, if the high nut 10 is screwed on the locking nut 18 in advance, the high nut 10 can be prevented from loosening and the screwing level of the high nut 10 can be adjusted. It is preferable to use it.

  Thus, since the base plate and the head of the fastening bolt protruding on the base plate are covered with the corrosion-preventing concrete 9, rainwater enters between the base top and the base plate at the time of rain as in the fourth embodiment. Will disappear. In addition, even if the metal pipe column base is submerged in a rainwater pool formed by rainfall, the water level of the rainwater pool is lower than the level of the connection between the metal tube column and the column base hardware. If the height of the upper end is designed, the lower part of the metal tube column can be prevented from being submerged in the rainwater reservoir, so that the metal tube column base is the rainwater reservoir except for the outer surface of the upper end of the column base hardware. Can break contact with.

  That is, even if the metal tube column base is submerged in a rainwater reservoir formed by rainfall, the metal tube column, the base plate, and the head of the fastening bolt protruding on the base plate can break contact with the rainwater reservoir. Therefore, the corrosive environment of the base portion of the metal pipe column can be greatly improved. However, for the column base hardware, the lower part of the column base hardware is covered with anti-corrosion concrete so that contact with the rain water pool can be cut off, but the outer surface of the upper end of the column base hardware may be submerged in the rain water pool. In consideration of the corrosion allowance, the thickness of the wall at the upper end of the column base metal is preferably made thicker than the thickness of the metal tube column.

  The planar shape of the base plate 2 is a hollow circle or a polygon at the center, and the outer shape is a polygon or a circle such as a quadrangle or a hexagon. Moreover, a steel pipe, an aluminum pipe, etc. can be used for a metal pipe. In addition to a circular tube, a polygonal tube such as a quadrangular shape, a hexagonal shape or an octagonal shape can be used as the shape.

  In addition, here, four anchor bolts 6 are used in which one end protrudes from the top of the foundation and the other end is embedded in the foundation. However, the number of anchor bolts 6 is not particularly limited. Can be increased or decreased as appropriate. Here, hexagonal bolts are used as the fastening bolts, but the bolts are not particularly limited, and may be other polygonal shapes.

  FIG. 10 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  The base 4 is formed at a level higher than the ground GL and the fitting portion is formed on the outer periphery of the upper end of the column base metal, and the lower end of the metal tube column is extrapolated to the fitting portion. By applying fillet welding between the lower end of the metal tube column and the outer periphery of the column base metal, there is no difference from Example 7 except that the metal tube column and the column base metal are joined. . However, since the base top 5 is at a level higher than the ground GL, and therefore, the top surface of the anticorrosive concrete is also at a level higher than the ground GL, it is difficult for rainwater to collect on the anticorrosive concrete 9 during rainfall. There are advantages.

  Thus, like Example 7, the corrosive environment of the base part of a metal pipe column can be improved significantly.

  FIG. 11 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  The base 4 is formed at a level lower than the ground GL and the top surface of the anticorrosive concrete 9 is formed at the same level as the ground GL, and the wire mesh lath 16 is anticorrosive to prevent cracking of the anticorrosive concrete. There is no difference from Example 7 except that it is incorporated in concrete.

  As long as the maximum level of the water surface of the rainwater pool formed during rainfall does not exceed the level of the outer peripheral connecting portion at the upper end of the column base hardware, the lower part of the metal tube column will not be submerged. Therefore, the corrosive environment at the base of the metal tube column can be greatly improved. Further, since the upper surface of the anticorrosion concrete 9 is formed at the same level as the ground GL, there is no possibility that a pedestrian or the like will trip over the anticorrosion concrete or hook clothes.

  FIG. 12 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  In the present embodiment, when rebuilding an illumination pillar, a signal pillar, a sign pillar, etc., an existing foundation 24 is used to newly form a base structure of a metal tube pillar.

  The existing foundation 24 has a level at which the top 15 of the existing foundation is lower than the ground GL, and the anchor bolts 6 of the four existing anchor bolts 26 are fixed to each other by the anchor bolt connecting material 11 in the existing foundation 24. One end of the existing anchor bolt 26 is embedded in the existing foundation 24, and the other end projects upward from the existing foundation top end 15. Concrete is poured onto the existing foundation 24 to form a new foundation 27 having a new foundation top 25.

  Here, one end portion of the four existing anchor bolts 26 protrudes upward from the existing base top end 15, and the high nut 10 is anchored on the locking nut 18 screwed into the anchor bolt from the projected one end portion. The bolt 6 is screwed in the middle, embedded in the new foundation 27 so that the level of the upper end of the high nut 10 matches the level of the new foundation top end 25, and the other ends of the four existing anchor bolts 26 and The anchor bolt connecting material 11 is embedded in the lower portion of the existing foundation 4 and concrete is poured so that the new foundation top 25 is at the same level as the ground GL to form the new foundation 27. The fastening bolt insertion hole 14 drilled in the base plate 2 integrated with the column base 3 is aligned with the upper end of the high nut 10, and the base plate is placed on the new foundation ceiling 25 including the upper end of the high nut 10. 2 is placed. Then, the hexagonal tightening bolt 12 having an outer surface is screwed into the high nut 10 via the plain washer 8 and tightened to fix the base plate 2 on the new foundation top end 25 of the new foundation 27.

  Thereafter, the base plate 2, the column base metal 3, and the heads of the fastening bolts 12 protruding on the base plate are covered with the corrosion prevention concrete 9 except for the upper end portion of the column base metal 3. Since only the head of the fastening bolt 12 protrudes above the base plate 2 and the protruding length is short, the thickness of the corrosion-preventing concrete 9 can be reduced as in the seventh embodiment. Then, the metal tube column 1 is erected by screwing it into the column base 2 from above.

  In this case, the lower end of the metal tube column is inserted inside the upper end of the column base metal, and between the upper end of the column base metal and the outer periphery of the metal tube column, and the lower end of the metal tube column and the inner periphery of the column base metal The metal tube column and the column base metal are joined by performing fillet welding between the metal tube column and the bottom end of the metal tube column. You may join by carrying out fillet welding between the lower end of a metal pipe column, and the outer periphery of a column base metal fitting by extrapolating to a fitting part. Further, in order to prevent cracking of the anticorrosive concrete, a wire mesh lath may be stretched horizontally in the anticorrosive concrete. Alternatively, the effect of preventing cracking of the anticorrosive concrete can be obtained by incorporating a crossing of a plurality of reinforcing bars in a plane instead of the lath into the anticorrosive concrete.

  Further, here, when the high nut 10 is screwed to the middle of one end projecting above the existing anchor bolt 26, the locking nut 18 is screwed in advance, but the screwing of the locking nut 18 may be omitted. Absent. However, if the high nut 10 is screwed on the locking nut 18 in advance, the high nut 10 can be prevented from loosening and the screwing level of the high nut 10 can be adjusted. It is preferable to use it.

  Therefore, as in Example 7, the base plate and the heads of the fastening bolts protruding on the base plate are covered with the corrosion-preventing concrete, so that rainwater can enter between the top of the new foundation and the base plate at the time of rain. Disappear. In addition, even if the metal pipe column base is submerged in a rainwater pool formed by rainfall, the water level of the rainwater pool is lower than the level of the connection between the metal tube column and the column base hardware. If the height of the upper end is designed, the lower part of the metal tube column can be prevented from being submerged in the rainwater reservoir, so that the metal tube column base is the rainwater reservoir except for the outer surface of the upper end of the column base hardware. Can break contact with.

  That is, even if the metal tube column base is submerged in a rainwater reservoir formed by rainfall, the metal tube column, the base plate, and the head of the fastening bolt protruding on the base plate can break contact with the rainwater reservoir. Therefore, the corrosive environment of the base portion of the metal pipe column can be greatly improved. However, for the column base hardware, the lower part of the column base hardware is covered with anti-corrosion concrete so that contact with the rain water pool can be cut off, but the outer surface of the upper end of the column base hardware may be submerged in the rain water pool. In consideration of the corrosion allowance, the thickness of the wall at the upper end of the column base metal is preferably made thicker than the thickness of the metal tube column.

  Thus, the present invention can newly form the base structure of the metal pipe column using the existing foundation 24.

  The planar shape of the base plate 2 is a hollow circle or a polygon at the center, and the outer shape is a polygon or a circle such as a quadrangle or a hexagon. Moreover, a steel pipe, an aluminum pipe, etc. can be used for a metal pipe. In addition to a circular tube, a polygonal tube such as a quadrangular shape, a hexagonal shape, or an octagonal shape can be used as the shape.

  Also, here, four anchor bolts with one end protruding above the existing top of the foundation and the other end embedded in the foundation were used, but the number is not particularly limited and is necessary. It can be appropriately increased or decreased accordingly. Here, hexagonal bolts are used as the fastening bolts, but the bolts are not particularly limited, and may be other polygonal shapes.

  FIG. 13: is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention.

  The new foundation top 27 is formed at a level higher than the ground GL, and the fitting portion is formed on the outer periphery of the upper end portion of the column base metal, and the lower end of the metal tube column is used as the fitting portion. What is different from Example 10 except that the metal tube column and the column base metal fitting are joined by extrapolating and performing fillet welding between the lower end of the metal tube column and the outer periphery of the column base metal fixture. Absent. However, since the new foundation top 25 is at a level higher than the ground GL, and therefore, the top surface of the anticorrosive concrete is also at a level higher than the ground GL, it is difficult for rainwater to collect on the anticorrosive concrete 9 during rainfall. There is an advantage.

  Thus, like Example 10, the corrosive environment of the base part of a metal pipe column can be improved significantly.

  FIG. 14 is a longitudinal sectional view showing another example of the base structure of the metal tube pillar according to the present invention.

  The new foundation 27 is formed at a level lower than the ground GL and the upper surface of the anticorrosive concrete 9 is formed at the same level as the ground GL, and a wire mesh lath 16 is used to prevent the anticorrosive concrete from cracking. There is no difference from Example 10 except that is incorporated into the anticorrosive concrete.

  As long as the highest level of the water surface of the rainwater pool formed during the rain does not exceed the level of the outer peripheral connection part at the upper end of the column base metal, the lower part of the metal tube column will not be submerged. Therefore, the corrosive environment at the base of the metal tube column can be greatly improved. Further, since the upper surface of the anticorrosion concrete 9 is formed at the same level as the ground GL, there is no possibility that a pedestrian or the like will trip over the anticorrosion concrete or hook clothes.

  Since the base structure of the metal tube pillar according to the present invention does not allow rainwater to enter between the base plate and the base top end, corrosion around the level of the base top end of the anchor bolt can be prevented. Moreover, even if a rainwater pool is formed on the foundation of the metal tube column and the base structure of the metal tube column is submerged in the rainwater pool, the base of the metal tube column can be prevented from being corroded. The durability of can be improved.

It is a longitudinal cross-sectional view which shows an example of the base structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. An example of the relaxation preventing metal fitting used in the present invention is shown. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. Another example of the relaxation preventing metal fitting used in the present invention is shown. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view which shows the other example of the base part structure of the metal pipe pillar concerning this invention. It is a longitudinal cross-sectional view of the base part structure of the metal pipe pillar concerning a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal pipe pillar 2 Base plate 3 Column base 4 Foundation 5 Foundation top 6 Anchor bolt 7 Fastening nut 8 Plain washer 9 Corrosion-proof concrete 10 High nut 11 Anchor bolt connection material 12 Fastening bolt 13 Anchor bolt insertion hole 14 Fastening bolt insertion Hole 15 Existing top ceiling 16 Lath 17 Relaxation prevention metal 18 Loosening prevention nut 19 Rib plate 20 Inner surface of the relaxation prevention metal 21 Locking bolt of the relaxation prevention metal 22 Extension part of the relaxation prevention metal 24 Existing foundation 25 New foundation top end 26 Existing anchor Bolt 27 New foundation GL Ground W Fillet weld

Claims (5)

  Insert the protruding part of the anchor bolt with one end protruding above the top of the foundation and the other end embedded in the foundation into the anchor bolt insertion hole drilled in the base plate, and tighten it with the tightening nut. A base structure for standing a metal pipe column thinner than a column base metal through a hardware, and a base plate and column base hardware installed on the top of the foundation, and an anchor bolt protrusion protruding on the base plate And the base structure of the metal pipe column which covers a fastening nut with corrosion prevention concrete except for the upper end part of a column base metal.   The base structure of a metal pipe column according to claim 1, wherein the tightening nut includes a loosening prevention fitting.   Anchor bolts with high nuts screwed halfway into one end are embedded in the foundation so that the upper end level of the high nut matches the top level of the foundation, and the bolts are inserted into the base plate. Align the base plate, insert the base plate and tighten the tightening bolt with the high nut screwed into the anchor bolt, and attach the metal pipe column thinner than the column base bracket to the base plate via the column base bracket A base structure for standing, covering the base plate and column base hardware installed on the top of the foundation and the head of the tightening nut protruding on the base plate with the anti-corrosion concrete except for the top end of the column base metal The base structure of the metal tube pillar.   The base structure of the metal pipe column according to claim 3, wherein the fastening bolt includes a loosening prevention metal fitting. The base structure of the metal pipe column according to any one of claims 1 to 4, wherein the base plate and the column base metal are integrated.

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