JP2011032725A - Column leg structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a column leg structure capable of facilitating the work of its installation. <P>SOLUTION: This column leg structure includes column leg hardware 24 fixed on a lower end part of a column member 22 and provided on first concrete 30, an anchor bolt 28 buried in the first concrete 30 while its upper end part protrudes upward, and a pressing member 26 arranged on the column leg hardware 24 and connected with the upper end part of the anchor bolt 28 to facilitate the work for installing this column leg structure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a column base structure in which a column base metal joined to a lower end portion of a column member of a building structure is fixed on foundation concrete via an anchor bolt.

  12 and 13 are a side view and a plan view showing a conventional column base structure 2, respectively. This conventional column base structure 2 includes a plate-shaped column base metal 6 joined to the lower end surface of the steel column 4 by welding. The column base 6 is placed on a mortar layer 12 formed on the upper side of the foundation concrete 10 (first concrete).

  Upper end thread portions of a plurality of anchor bolts 14 projecting upward from the upper surface of the mortar layer 12 from the foundation concrete 10 pass through the plurality of bolt holes 8 formed in the column base metal 6, and the nut member 16 and the screw. The column base metal 6 is fixed by being coupled. As such a column base structure similar to the conventional column base structure 2, there exists a thing as described in patent document 1, for example.

Japanese Patent No. 4006503

  However, in the conventional column base structure 2, each of the upper ends of the plurality of anchor bolts 14 has a structure that penetrates each of the plurality of bolt holes 8 formed in the column base metal 6. There was a problem that the installation work was very troublesome.

  For example, in the conventional column base structure 2, an error occurs in the position of any of the plurality of anchor bolts 14 or any of the bolt holes 8 of the column base metal 6, or the column base metal 6 When it is necessary to adjust the horizontal position and the horizontal angle around the vertical axis, etc., it must be dealt with according to individual specific circumstances that occur for each such column base structure 2, There is a problem that the installation work of the column base structure 2 becomes very troublesome.

  Then, this invention makes it a subject to provide the column base structure which can make the installation operation | work easy in view of the said problem.

In order to solve the above problems, the column base structure according to the present invention is:
Column base hardware fixed on the lower end of the column member and installed on the first concrete,
Anchor bolts embedded in the first concrete with the upper end protruding upward;
A pressing member disposed on the column base metal and connected to an upper end portion of the anchor bolt.

The column base structure according to the present invention is
The upper surface of the column base metal is formed in a taper shape such that the thickness decreases from the joint portion with the column member toward the peripheral end surface of the column base metal.

  The column base structure according to the present invention is characterized in that the surface on the upper surface side of the column base metal is formed into a satin finish.

The column base structure according to the present invention is
A horizontal portion that is provided close to the side opposite to the column member at a portion of the upper end portion of the anchor bolt that is higher than the presser member and resists a horizontal force that attempts to move the upper end portion of the anchor bolt away from the column member. A force bearing member;
The second concrete is formed on the first concrete and has at least a second concrete having an upper surface at a position higher than the horizontal force bearing member.

  The column base structure according to the present invention is characterized in that a diameter-expanding member having a diameter larger than the diameter of the upper end portion is fixed to the upper end portion of the anchor bolt.

  The column base structure according to the present invention is characterized in that a nut member screwed to the upper end portion of the anchor bolt is used as the diameter-expanding member.

According to such a column base structure of the present invention,
Column base hardware fixed on the lower end of the column member and installed on the first concrete,
Anchor bolts embedded in the first concrete with the upper end protruding upward;
By providing a pressing member disposed on the column base metal and connected to the upper end of the anchor bolt,
Installation work of the column base structure can be facilitated.

  That is, according to the column base structure of the present invention, it is not necessary to insert the anchor bolt into the bolt hole of the column base metal like the conventional column base structure, and the position of the column base metal and the position of the column base metal are not affected by the anchor bolt. Since the adjustment work such as the angle can be performed, the installation work of the column base structure can be facilitated.

  Further, according to the column base structure of the present invention, the column base hardware of the column base structure of the present invention does not require a bolt hole for inserting an anchor bolt like the conventional column base structure. Since it is possible to reduce the processing man-hours for the leg hardware, the manufacturing cost can be reduced.

Moreover, according to the column base structure of the present invention,
The upper surface of the column base metal is formed in a tapered shape such that the thickness is reduced from the joint portion with the column member toward the peripheral end surface of the column base metal.
It is possible to prevent the column base hardware from being displaced in the horizontal direction.

Moreover, according to the column base structure of the present invention,
By forming the surface on the upper surface side of the column base hardware in a satin-like shape,
It is possible to prevent the column base hardware from being displaced in the horizontal direction.

Moreover, according to the column base structure of the present invention,
A horizontal portion that is provided close to the side opposite to the column member at a portion of the upper end portion of the anchor bolt that is higher than the presser member and resists a horizontal force that attempts to move the upper end portion of the anchor bolt away from the column member. A force bearing member;
By comprising the second concrete formed on the first concrete and having an upper surface at a position higher than at least the horizontal force bearing member,
The column base hardware can be reduced in thickness and weight.

Moreover, according to the column base structure of the present invention,
By fixing an enlarged member having a diameter larger than the diameter of the upper end to the upper end of the anchor bolt,
The force acting between the anchor member and the coated concrete layer can be reliably transmitted.

Moreover, according to the column base structure of the present invention,
By using a nut member screwed to the upper end portion of the anchor bolt as the diameter expanding member,
It is possible to simplify the fixing operation between the diameter-expanding member and the upper end portion of the anchor member.

It is a side view showing column base structure 20 concerning a 1st embodiment of the present invention. It is a top view which shows the column base structure 20 in FIG. It is an enlarged side view which takes out and shows only the lower end part and the column base metal object 24 of the steel column 22 in FIG. It is a side view which shows the column base structure 40 which concerns on the 2nd Embodiment of this invention. It is an AA arrow directional view which shows the column base structure 40 in FIG. FIG. 6 is a side view showing a procedure for installation work of the column base structure 40. FIG. 6 is a side view showing a procedure for installation work of the column base structure 40. It is a principal part enlarged view which expands and shows the principal part in the substantially right half of the column base structure 40 shown in FIG. It is a top view which shows the column base structure which concerns on another embodiment of the column base structures 20 and 40 which concern on the 1st and 2nd embodiment of this invention. The figure which shows the horizontal force bearing member 60 which consists of a pair of rod member used for the column base structure which concerns on the column base structure which concerns on embodiment different from the column base structures 20 and 40 which concern on the 1st and 2nd embodiment of this invention. In the drawing, (a) is a plan view thereof, and (b) is a side view thereof. The horizontal force bearing member 70 which consists of a pair of rod member used for the column base structure which concerns on the column base structure which concerns on embodiment different from the column base structures 20 and 40 which concern on the 1st and 2nd embodiment of this invention is shown. It is a figure, (a) in this figure is the top view, (b) is the side view. It is a side view which shows the conventional column base structure 2. FIG. It is a top view which shows the column base structure 2 in FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the column base structure which concerns on this invention is demonstrated concretely based on drawing.
FIGS. 1 to 3 are views referred to for explaining the column base structure 20 according to the first embodiment of the present invention.

  As shown in FIGS. 1 and 2, the column base structure 20 according to the present embodiment includes one steel column 22 (column member), one column base metal 24, four presser members 26, and eight. Anchor bolts 28 and one foundation concrete 30 (first concrete).

  As shown in FIG. 2, the steel column 22 is formed in a rectangular tube shape having a substantially square cross section. As shown in FIG. 1, a horizontal plate-like column base metal 24 is joined to the lower end surface of the steel column 22 by welding.

  As shown in FIG. 2, the column base 24 has a substantially square planar shape, the center thereof is the same as the steel column 22, and its four sides are inclined by 45 degrees with respect to the four sides of the steel column 22. Has been placed. As shown in FIG. 1, the column base metal 24 is horizontally disposed on the foundation concrete 30 via the mortar layer 32.

  Further, as shown in FIG. 3, the upper surface of the column base metal 24 is formed in a taper shape such that the thickness decreases from the joint portion with the steel column 22 toward the peripheral end surface of the column base metal 24. ing. In addition, the column base metal 24 is formed with a satin finish on the upper surface formed in this manner by shot blasting or the like.

  Moreover, as shown in FIG.1 and FIG.2, in the foundation concrete 30, the four main reinforcements 34 are arrange | positioned so that it may extend in the up-down direction, and these four main reinforcements 34 are enclosed horizontally, In addition, a plurality of endless strips 36 arranged apart from each other in the vertical direction are arranged.

  A total of eight anchor bolts 28 are arranged in the foundation concrete 30. Each anchor bolt 28 is embedded in the foundation concrete 30 with a length other than the upper end so that the upper end of the anchor bolt 28 protrudes from the upper surface of the foundation concrete 30.

  A male screw portion 28 a is formed at the upper end portion of the anchor bolt 28. In addition, as shown in FIG. 2, the eight anchor bolts 28 are arranged side by side at intervals on the outside of the planar shape of the column base 24.

  Each of the four pressing members 26 is formed in a substantially bar shape. Each of the four pressing members 26 is arranged so as to surround the steel column 22 by being arranged in parallel and horizontally with each of the four sides of the substantially square cross-sectional shape of the steel column 22.

  In addition, the holding member 26 is placed on the upper surfaces of the four corners of the column base metal 24 at the center in the length. As a result, both end portions of the pressing member 26 in the length direction are arranged at positions outside the planar shape of the column base metal 24. As shown in FIG. 1, bolt holes 37 penetrating in the vertical direction are formed at both ends of the pressing member 26.

  The upper end portion of the anchor bolt 28 is passed through the bolt hole 37 of each holding member 26, and the first nut member 38 is screwed to the male screw portion 28 a at the upper end portion of each anchor bolt 28, whereby the column base 24 is attached. It is designed to be pressed onto the foundation concrete 30.

Next, a procedure for installing the column base structure 20 will be described.
As shown in FIG. 1, in order to install the column base structure 20, first, foundation concrete 30 and eight anchor bolts 28 are installed.

  That is, the main reinforcement 34, the band reinforcement 36, and the like are arranged, and the eight anchor bolts 28 are supported by a gantry (not shown) and placed at a predetermined position, and then these are embedded so as to embed them. The basic concrete 30 and the eight anchor bolts 28 are installed by filling and solidifying the concrete in the member.

  Next, after the foundation concrete 30 is cured for a certain period and sufficiently solidified, the mortar member 100 for adjusting the height and angle of the column base metal 24 is placed on the upper surface of the foundation concrete 30. Then, the steel column 22 and the column base metal 24 that are already integrated by the joining work of the previous stage that is carried into the installation site of the column base structure 20 are placed on the mortar member 100 in the front before being completely solidified. To do.

  Further, the center portion of the length of the pressing member 26 is placed on each upper surface of the four corners of the column base metal 24 while passing the upper end portion of the anchor bolt 28 through each of the bolt holes 37 of the four pressing members 26.

  After adjusting the height and angle of the steel column 22 and the column base 24 on the mortar member 100, the first nut member 38 is screwed to the male screw portion 28a at the upper end portion of each anchor bolt 28. Thus, the column base 24 is pressed against the foundation concrete 30 by the holding member 26, and the steel column 22 and the column base 24 are fixed. Finally, the mortar layer 32 is formed by pouring and solidifying the mortar between the upper surface of the foundation concrete 30 and the column base metal 24.

  According to the column base structure 20 according to the present embodiment, it is not necessary to insert the anchor bolt into the bolt hole of the column base metal like the conventional column base structure, and the position of the column base metal is not affected by the anchor bolt. Therefore, the installation work of the column base structure 20 can be facilitated.

  Further, the column base 24 of the column base structure 20 according to the present embodiment does not require a bolt hole for inserting an anchor bolt as in the conventional column base structure, and therefore the man-hours for processing the column base 24 are not limited. Therefore, the manufacturing cost can be reduced.

  Further, according to the column base structure 20 according to the present embodiment, the column base 24 is horizontally arranged in a region outside the steel column 22 joined to the column base 24 as shown in FIG. As the column base 24 is installed as shown in FIG. 1, the slope is formed such that the upper surface approaches the lower surface side as the distance from the steel column 22 increases. Since the upper surface to be moved cannot horizontally move in a direction in which any one of the pressing members 26 is pushed up, the column base metal 24 can be prevented from being shifted in the horizontal direction.

  Further, according to the column base structure 20 according to the present embodiment, the upper surface of the column base metal 24 is formed in a satin shape, so that the frictional force between the column base metal 24 and the pressing member 26 is reduced. Since it increases, it is possible to prevent the column base 24 from being displaced in the horizontal direction.

  Next, FIGS. 4 to 8 are views referred to for explaining the column base structure 40 according to the second embodiment of the present invention. The same parts as those of the column base structure 20 according to the first embodiment will be described using the same reference numerals, and overlapping descriptions of the same configurations will be omitted.

  As shown in FIGS. 4 and 5, the column base structure 40 according to the present embodiment has two pressers instead of the four press members 26 of the column base structure 20 according to the first embodiment. A member 42 is provided, and eight anchor bolts 44 are provided instead of each of the eight anchor bolts 28 of the column base structure 20 according to the first embodiment. Further, the column base structure 40 includes eight second nut members 45, a set of horizontal force bearing members 46, and covered concrete 52 (second concrete).

  As shown in FIG. 5, each of the two pressing members 42 of the column base structure 40 includes four pressing members 26 of the column base structure 20 according to the first embodiment (see FIG. 2). The two pressing members 26 arranged side by side so that their length directions are perpendicular to each other are connected to each other so as to be integrated into a substantially L shape.

  As shown in FIG. 4, the anchor bolt 44 has a surplus portion protruding upward from the upper surface of the first nut member 38 screwed to the male screw portion 44 a so that the diameter of the anchor bolt 44 is twice or more. It is set to be length.

  At the upper end portion of the extra length portion of each anchor bolt 44, a second nut member 45 (expansion member) is at least as long as the height dimension of the second nut member 45 (may be longer). Screwed and screwed together.

  As shown in FIGS. 4 and 5, the horizontal force bearing member 46 is formed symmetrically with each other, and a pair of bar members that form a substantially octagonal planar shape by being combined with the opening sides facing each other. 48, 50. The pair of rod members 48 and 50 are arranged such that the respective constant length portions at both ends facing each other overlap each other in the height direction. As a material of the bar members 48 and 50, for example, a reinforcing bar can be used.

  As shown in FIG. 4, each of the rod members 48 and 50 of the horizontal force bearing member 46 is disposed horizontally within the height range between the first nut member 38 and the second nut member 45, and is shown in FIG. As shown, the substantially octagonal planar shape is disposed so as to horizontally surround all eight anchor bolts 44.

  By the way, each of the rod members 48 and 50 of the horizontal force bearing member 46 may be disposed so as to contact each of or any of the surplus portions of the eight anchor bolts 44, or the surplus length. You may arrange | position so that it may not contact any of a part.

  As shown in FIG. 4, a covering concrete 52 is formed on the foundation concrete 30 at a predetermined height. The covering concrete 52 is formed from the upper surface of the foundation concrete 30 to a height higher than the upper end surface of the anchor bolt 44, so that the lower end portion of the steel column 22, the column base metal 24, the pressing member 42, and the anchor bolt 44 The upper end portion, the horizontal force bearing member 46, the first nut member 38, the second nut member 45, and the like are formed so as to be embedded.

Next, a procedure for installing the column base structure 40 will be described.
Of the series of operations when installing the column base structure 40, the steel column 22 and the column base hardware 24 are fixed by screwing the first nut member 38 to the male screw portion 44 a at the upper end of each anchor bolt 44. The work procedure up to this point is the same as the procedure for installing the column base structure 20 according to the first embodiment.

  After the work procedure so far, as shown in FIG. 6, when the work of fixing the steel column 22 and the column base 24 is completed, as shown in FIG. 7, the upper end of the extra length of each anchor bolt 44 is After attaching the second nut member 45, the horizontal force bearing member 46 is installed.

  In the horizontal force bearing member 46, each of the pair of rod members 48, 50 is disposed at a predetermined position as described above, and then each of the pair of rod members 48, 50 is anchor bolted by a wire (not shown). 44 and the second nut member 45 or the like.

  Further, in the fixing work of such a horizontal force bearing member 46, the length portions that overlap each other in the height direction between the ends corresponding to each other in the pair of rod members 48, 50 constituting the horizontal force bearing member 46, It is preferable to fix them as described above in a state where they are tied together by a wire (not shown) and connected to each other.

  Further, the bar members 48, 50 of the horizontal force bearing member 46 are not limited to being anchored to the anchor bolt 44, the second nut member 45, or the like with a wire or the like, but on the foundation concrete 30, the column base metal 24, or the pressing member 42. You may make it install in predetermined | prescribed height by mounting on the support member etc. which are mounted on the unillustrated.

  After the installation of the second nut member 45 and the horizontal force bearing member 46 is completed, the ready-mixed concrete is placed in a mold member (not shown) extending upward along the outer periphery of the foundation concrete 30 and solidified over time. As shown in FIG. 4, the coated concrete 52 is formed.

  According to the column base structure 40 according to the present embodiment, it is not necessary to insert the anchor bolt into the bolt hole of the column base metal like the conventional column base structure, and the position of the column base metal is not affected by the anchor bolt. Therefore, the installation work of the column base structure 40 can be facilitated.

  Further, the column base metal 24 of the column base structure 40 according to the present embodiment does not require a bolt hole for inserting an anchor bolt as in the conventional column base structure. Therefore, the manufacturing cost can be reduced.

  Further, according to the column base structure 40 according to the present embodiment, as in the first embodiment, the column base metal 24 is a steel frame to be joined to the column base metal 24 as shown in FIG. In the region outside the column 22, the column base hardware 24 is formed in the horizontal direction by being inclined so that the upper surface approaches the lower surface side as it moves away from the steel column 22 in the horizontal direction. It is possible to prevent deviation.

  Further, according to the column base structure 40 according to the present embodiment, the top surface of the column base hardware 24 is formed in a satin shape like the first embodiment. It is possible to prevent the hardware 24 from shifting in the horizontal direction.

Further, the column base structure 40 according to the present embodiment has the following actions and effects. This will be described with reference to FIG.
FIG. 8 is an enlarged view of the main part including the right side part of the column base metal 24 in the drawing in the substantially right half of the column base structure 40 shown in FIG. Further, for convenience of explanation, only one anchor bolt 44 on the right side in the figure is illustrated and described.

  As described above, the column base structure 40 includes an anchor bolt 44 having a surplus portion on the upper side of the first nut member 38 and a horizontal force bearing member 46 provided in the vicinity of the length portion. Coated concrete 52 is formed so as to embed these.

  For this reason, even if the bending moment M acts on the column base structure 40, the load F (hereinafter simply referred to as the compression bundle F) as a compression bundle that acts as a reaction force against the compression force as will be described later. Therefore, even if a bending moment is generated in the column base metal 24, the compressive bundle F reduces the tensile force transmitted from the anchor bolt 44 to the column base metal 24 via the pressing member 42.

  In this way, when the tensile force transmitted from the anchor bolt 44 to the column base 24 is reduced, the bending moment transmitted from the steel column 22 to the anchor bolt 44 can also be decreased. Since it is not necessary to increase the thickness of the column 24, the column base metal 24 can be thinned to reduce its weight.

  That is, when a load that generates a bending moment M in the counterclockwise direction as shown in FIG. 8 is applied to the steel column 22, it is generated in the anchor bolt 44 via the column base metal 24 and the holding member 42. Of the tensile load P to be generated, each of the load P2 generated in the surplus length portion and the tensile force R generated in the horizontal direction on the bar member 48 of the horizontal force bearing member 46 (hereinafter referred to as horizontal force R) is a component force. A compression bundle F as a resultant force is present in the covering concrete 52 existing between the joint portion of the steel column 22 and the column base metal 24 and the adjacent portion of the extra length portion of the rod member 48 and the anchor bolt 44. It occurs along the diagonal as shown.

  For this reason, as described above, the column base structure 40 acts by the compression bundle F pressing the joint portion between the steel column 22 and the column base metal 24 when the bending moment M is applied. The tensile force transmitted from the anchor bolt 44 to the column base metal 24 via the holding member 42 is reduced, and the bending moment transmitted from the steel column 22 to the anchor bolt 44 can be decreased. It is possible to make the thickness of the substrate thinner than before.

  Further, when a load that generates a bending moment M in the counterclockwise direction as shown in FIG. 8 is applied to the steel column 22, the column is caused by the load P 1 of the tensile load P generated in the anchor bolt 44. The leg hardware 24 is fixed. The load P1 at this time can be made smaller than the tensile load generated in the conventional anchor bolt 44 by reducing the bending moment transmitted from the steel column 22 to the anchor bolt 44 as described above.

  On the other hand, if the covering concrete 52 and the horizontal force bearing member 46 are not installed, since the covering concrete 52 itself is made of concrete, the concrete has a high resistance to compressive load, but the resistance to tensile load is small. When the moment M is applied, the horizontal force R generated in the covering concrete 52 cannot be endured, and the covering concrete 52 between the steel column 22 and the extra length of the anchor bolt 44 may be cracked. When cracks occur in the covering concrete 52 as described above, a large bending moment acts on the column base metal 24 as in the conventional case, and the column base metal 24 is plastically deformed.

  However, in the column base structure 40 according to the present embodiment, since the horizontal force bearing member 46 is installed between the steel column 22 and the extra length portion of the anchor bolt 44, when the bending moment M is applied, Since the horizontal force bearing member 46 can bear most of the horizontal force R generated between the steel column 22 and the extra length of the anchor bolt 44 (resist the horizontal force R), the steel column 22 and the anchor bolt 44 are supported. It is possible to prevent the cracking from occurring in the coated concrete 52 between the extra length portions.

  At this time, even if the extra length portion of the anchor bolt 44 and the rod member 48 of the horizontal force bearing member 46 are separated (even if not in direct contact), the covering concrete 52 is interposed between them, The horizontal force bearing member 46 can exhibit its function through the covering concrete 52.

  And in the column base structure 40 which concerns on this Embodiment, since the outer peripheral surface of the steel column 22 or the column base metal 24, the foundation concrete 30, and the covering concrete 52 exists in a comparatively close position, the covering of the above positions is carried out. Although the concrete 52 is easily cracked, since the horizontal force bearing member 46 is provided in the column base structure 40, the occurrence of cracks as described above can be prevented.

  On the other hand, in the column base structure 40 according to the present embodiment, the second nut member 45 (expansion member) is fixed to the upper end portion of the extra length portion of the anchor bolt 44, so that the tensile load is applied to the anchor bolt 44. When P is generated, the lower surface of the second nut member 45 is caught on the upper surface of the stepped surface of the covering concrete 52. Therefore, the downward load P2 acting on the covering concrete 52 at that time acts as a fixing force. The fixing force with the covering concrete 52 can be improved reliably.

  Further, in the column base structure 40 according to the present embodiment, since the second nut member 45 is used as a diameter-expanding member that is screw-coupled to the upper end portion of the extra length portion of the anchor bolt 44, The second nut member 45 as a diameter-expanding member can be easily fixed to the extra length portion.

  According to the column base structure 40 according to this embodiment, since the horizontal force bearing member 46 is installed, the tensile force acting on the column base metal 24 is reduced. )can do.

  For this reason, according to the column base structure 40 which concerns on this Embodiment, while being able to achieve weight reduction of the column base metal object 24, the enlargement and the cost increase of the column base structure 40 can be prevented.

  In the column base structure 20 according to the first embodiment, the four substantially rod-shaped pressing members 26 are provided. Instead of the four pressing members 26, the second embodiment is provided. Two substantially L-shaped pressing members 42 used in the column base structure 40 according to the embodiment may be provided.

  Moreover, in the column base structure 40 according to the second embodiment, two substantially L-shaped pressing members 42 are provided, but instead of the two pressing members 42, the first The four substantially rod-like pressing members 26 used in the column base structure 20 according to the embodiment may be provided.

  Moreover, in the column base structure 20 according to the first embodiment, the planar shape of the column base metal 24 is formed to be substantially square, but the planar shape of the column base metal is such as The shape is not limited to a substantially square shape. The same applies to the column base structure 40 according to the second embodiment.

  Since the outer periphery of the column base metal may be a shape that can be pressed against the foundation concrete side by the pressing member, for example, a planar shape such as a column base metal 58 shown in FIG. Any other shape of the column base, as long as it is a shape that can hold the column base metal to the foundation concrete side by the length part inside the anchor bolt, avoiding the position where the anchor bolt is located Hardware may be used.

  In the column base structure 40 according to the second embodiment, as shown in FIG. 8, the upper surface of the covering concrete 52 is formed at a position higher than the upper surface of the second nut member 45. However, it is not necessary to limit to such a structure, for example, the upper surface of the covering concrete 52 is formed in the same height position as the lower surface of the 2nd nut member 45 in FIG. It may protrude from the upper surface of the concrete 52.

  Further, in the column base structure 40 according to the second embodiment, reinforcing bars are used as the material of the bar members 48 and 50 constituting the horizontal force bearing member 46, but instead of the reinforcing bars, round bars are used. Steel, flat steel, shaped steel, carbon fiber material, or the like may be used.

  Further, in the column base structure 40 according to the second embodiment, two bar members 48 that form a substantially octagonal planar shape when the horizontal force bearing members 46 are combined with each other. However, as another embodiment different from the second embodiment, instead of such a horizontal force bearing member 46, as shown in FIG. You may make it use the horizontal force bearing member 60 comprised by the two rod members 62 and 64 which form a square planar shape.

  Alternatively, instead of the horizontal force bearing member 46, as shown in FIG. 11, it is composed of two substantially L-shaped rod members 72, 74, and the L-shaped members of the two rod members 72, 74 respectively. You may make it use the horizontal force burden member 70 arrange | positioned so that a vertical side and a horizontal side may mutually cross | intersect between those length intermediate positions.

  Alternatively, although not shown, instead of the horizontal force bearing member 46, a single horizontal force bearing member formed in a substantially annular shape or a substantially rectangular ring shape may be used.

  Further, in the case of using the horizontal force bearing members 60 and 70 described above or a single horizontal force bearing member formed in a not-shown substantially ring shape or square ring shape, these horizontal force bearing members are 8 As long as the upper end portion of the anchor bolt 44 is surrounded horizontally, it can be formed in an arbitrary size.

  In the column base structure 40 according to the second embodiment, the second nut member 45 may not be attached. This is because the compression bundle F can be generated if the extra length of the anchor bolt 44, the horizontal force bearing member 46, and the covering concrete 52 are provided.

  Further, in the column base structure 40 according to the second embodiment, the second nut member 45 is attached to the upper end portion of the extra length portion of the anchor bolt 44, but instead of the second nut member 45, A thick flange-like member may be fixed as a diameter-expanded member by welding or the like.

  Further, in the column base structures 20 and 40 according to the first and second embodiments, the mortar member 100 is formed during the installation operation, and the column base metal 24 is placed on the mortar member 100. However, the column base 24 may be placed directly on the foundation concrete 30 without forming the mortar member 100.

  Further, in the column base structures 20 and 40 according to the first and second embodiments, the structure is provided with eight anchor bolts 44, but may be provided with a structure other than eight. .

  In the column base structures 20 and 40 according to the first and second embodiments, the anchor bolts 28 and 44 are provided. However, instead of the anchor bolt, a round bar steel or a deformed bar steel (atypical bar steel) is used. Other members such as a reinforcing bar may be used.

2 Column base 4 Steel column 6 Column base 8 Bolt hole 10 Basic concrete 12 Mortar layer 14 Anchor bolt 16 Nut member 20 Column base 22 Steel column 24 Column base 26 Holding member 28 Anchor bolt 28a Male thread 30 Basic concrete 32 Mortar layer 34 Main bar 36 Band bar 37 Bolt hole 38 First nut member 40 Column base structure 42 Holding member 44 Anchor bolt 44a Male screw part 45 Second nut member 46 Horizontal force bearing member 48, 50 Bar member 52 Covered concrete 58 Column Leg hardware 60, 70 Horizontal force bearing member 62, 64, 72, 74 Bar member 100 Mortar member

Claims (6)

Column base hardware fixed on the lower end of the column member and installed on the first concrete,
Anchor bolts embedded in the first concrete with the upper end protruding upward;
A column base structure comprising: a pressing member disposed on the column base metal and connected to an upper end portion of the anchor bolt.   The upper surface of the column base metal is formed in a taper shape so that the thickness is reduced from a joint portion with the column member toward a peripheral end surface of the column base metal. Column base structure as described.   3. The column base structure according to claim 1, wherein a surface on the upper surface side of the column base hardware is formed in a satin shape. A horizontal portion that is provided close to the side opposite to the column member at a portion of the upper end portion of the anchor bolt that is higher than the presser member and resists a horizontal force that attempts to move the upper end portion of the anchor bolt away from the column member. A force bearing member;
The column base structure according to any one of claims 1 to 3, further comprising: a second concrete formed on the first concrete and having an upper surface at a position higher than at least the horizontal force bearing member.   The column base structure according to claim 4, wherein a diameter-expanding member having a diameter larger than a diameter of the upper end portion is fixed to an upper end portion of the anchor bolt.   The column base structure according to claim 5, wherein a nut member that is screw-coupled to an upper end portion of the anchor bolt is used as the diameter-expanding member.

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