JP6284603B1 - Column base fixing structure - Google Patents

Abstract

The present invention provides a column base fixing structure capable of easily and cost-effectively injecting a grout material after fastening a nut. A column base fixing structure includes an anchor bolt fixed to a foundation concrete, a base plate in which an anchor bolt through-hole through which the anchor bolt passes is formed, a column base having a lower end fixed to the base plate, and an anchor bolt. There is an upper nut that is screwed into an anchor bolt that has penetrated the through hole and pressed against the base plate where the base concrete is located, and an assembly hole that allows the anchor bolt to pass between the upper nut and the base plate. And a washer sandwiched between the two. The washer is provided with a groove portion provided on a fastening surface with which the upper nut or the base plate comes into contact and extending from the outer peripheral side of the washer toward the assembly hole. The groove portion communicates with the gap between the anchor bolt and the anchor bolt through hole. [Selection] Figure 5

Description

  The present invention relates to a column base fixing structure in which columns forming a structure are installed on foundation concrete.

In the exposed-type column base method that fixes the column to the foundation concrete, the column base fixing structure uses an anchor bolt fixed to the foundation concrete and a base plate in which an anchor bolt through hole through which the anchor bolt passes is formed. The pillar is connected to the base plate. At this time, the base plate is pressed and fixed to the foundation concrete by screwing the nut into the anchor bolt penetrating the anchor bolt through hole and tightening the nut.
Then, the inner diameter of the anchor bolt through-hole is made larger than the outer diameter of the anchor bolt to facilitate the insertion of the anchor bolt into the anchor bolt through-hole, thereby improving the workability, and between the anchor bolt through-hole and the anchor bolt. An invention has been disclosed in which a grout material is injected into a gap to firmly fix a base plate and an anchor bolt (see, for example, Patent Documents 1 and 2).

  In addition, the conventional column base fixing structure is such that a nut is fastened to the anchor bolt and the base plate is pressed and fixed to the foundation concrete to determine the position of the column base and then grouted in the gap between the anchor bolt through hole and the anchor bolt. Injecting material. A washer is sandwiched between the nut and the base plate, and in order to inject the grout material into the gap between the anchor bolt through hole and the anchor bolt, it is necessary to secure a route for injecting the grout material into the gap from the outside. is there.

  In the invention disclosed in Patent Document 1, a groove for injecting a grout material that communicates with the anchor bolt through hole is formed on the upper surface of the base plate. The groove for injecting the grout material has an end outside the outer periphery of the washer, and after the nut is tightened, the grout material can be injected from the end. In the invention disclosed in Patent Document 2, a hole is formed in the washer sandwiched between the base plate and the nut, and the grout material can be injected from the hole after the nut is tightened. Since the column base is fixed in an accurate position, the grout material can be injected and solidified, so that the column base can be accurately installed and the inner surface of the anchor bolt through hole The firm fixation with the outer surface of the anchor bolt can be maintained.

Japanese Patent Laying-Open No. 2011-12402 (page 5-7, FIG. 1) Japanese Patent Laid-Open No. 10-237946 (page 3-4, FIGS. 1 and 2)

  However, in the invention disclosed in Patent Document 1, a groove for injecting grout material is formed in a base plate by processing. Therefore, when the base plate is large, there is a problem that it is difficult to place the base plate on the bed of a normal processing machine, and a special processing machine may be necessary. Further, since the groove for injecting the grout material is formed by cutting or the like for each base plate, there is a problem that the cost is higher than a base plate without the groove for injecting the grout material.

  In the invention disclosed in Patent Document 2, the anchor bolt through hole provided in the base plate is enlarged to the bottom of the grout material injection hole provided in the washer. Moreover, the anchor bolt through-hole is a non-cylindrical through-hole. The anchor bolt through hole also serves as a grout material injection port filled under the base plate, and it is necessary to inject a large amount of grout material by applying pressure from a small diameter injection port.

  The present invention solves the above-described problems, and realizes easy and cost-effective injection of grout material into the gap between the inner surface of the anchor bolt through hole and the outer surface of the anchor bolt after the nut is tightened. It is an object of the present invention to provide a column base part fixing structure that can be used.

(1) A column base fixing structure according to the present invention includes an anchor bolt fixed to foundation concrete, a base plate in which an anchor bolt through-hole through which the anchor bolt passes is formed, and a column having a lower end fixed to the base plate A leg, an upper nut that is screwed into the anchor bolt in a state of passing through the anchor bolt through hole, presses and fastens the base plate to the side where the foundation concrete is located, and an assembly hole through which the anchor bolt passes. And a washer sandwiched between the upper nut and the base plate, and the washer is provided on a fastening surface with which the upper nut or the base plate contacts, and the direction of the assembly hole from the outer peripheral side of the washer Bei a groove portion extending, and a notch shape toward the outer peripheral side of the washer is provided on the inner peripheral surface of the assembly hole , The notch shape, the washer penetrates in a direction perpendicular to the fastening surface, communicates with the gap of the anchor bolt and the anchor bolt through-hole, the groove, Hekomase a portion of said fastening surface The outer peripheral side end located on the outer peripheral side of the washer opens to the outer peripheral surface of the washer and communicates with the notch shape .
(2) The column base fixing structure according to the present invention includes an anchor bolt fixed to the foundation concrete, a base plate in which an anchor bolt through-hole through which the anchor bolt passes is formed, and a lower end fixed to the base plate. A column base, an upper nut that is screwed into the anchor bolt in a state of passing through the anchor bolt through hole, and presses and fastens the base plate to the side where the foundation concrete is located, and an assembly through which the anchor bolt penetrates And a washer sandwiched between the upper nut and the base plate, and the washer is provided on a fastening surface with which the upper nut or the base plate contacts, and the assembly hole from the outer peripheral side of the washer A groove portion extending in the direction of the outer periphery of the washer, the groove portion penetrating the washer in a direction perpendicular to the fastening surface. The outer peripheral side end located on the side opens to the outer peripheral surface of the washer, the inner peripheral end located on the inner peripheral side of the washer is located on the outer peripheral side of the washer with respect to the assembly hole, The inner peripheral side end communicates with a gap between the anchor bolt and the anchor bolt through hole.
(3) Further, the column base fixing structure according to the present invention includes an anchor bolt fixed to the foundation concrete, a base plate in which an anchor bolt through-hole through which the anchor bolt passes is formed, and a lower end fixed to the base plate. A column base, an upper nut that is screwed into the anchor bolt in a state of passing through the anchor bolt through hole, and presses and fastens the base plate to the side where the foundation concrete is located, and an assembly through which the anchor bolt penetrates And a washer sandwiched between the upper nut and the base plate, and the washer is provided on a fastening surface with which the upper nut or the base plate contacts, and the assembly hole from the outer peripheral side of the washer A groove portion extending in the direction of the outer periphery of the washer, the groove portion penetrating the washer in a direction perpendicular to the fastening surface. The outer peripheral side end located on the side opens to the outer peripheral surface of the washer, the inner peripheral end located on the inner peripheral side of the washer is located on the outer peripheral side of the washer with respect to the assembly hole, The inner peripheral side end communicates with a gap between the anchor bolt and the anchor bolt through hole.

  The column base fixing structure according to the present invention can inject a grout material using a groove provided in a washer sandwiched between an upper nut and a base plate. By simply applying the above washer, it is possible to easily inject the grout material into the gap between the inner surface of the anchor bolt through hole and the outer surface of the anchor bolt after fastening the nut, and a structure for injecting the grout material into the base plate is provided. Since there is no need, it is possible to provide a column base fixing structure with reduced cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a column base fixing structure according to Embodiment 1 of the present invention, in which (a) is a side view with a part in cross section, and (b) is a partial cross-sectional view showing an enlarged part. is there. It is an expansion perspective view of the periphery of the upper nut and washer of the column base part fixing structure of FIG. It is a figure of the state which removed the upper nut of FIG. It is the top view which looked at FIG. 3 from the front end side of the anchor bolt. It is explanatory drawing of the cross section in AA of FIG. It is an expansion perspective view of the periphery of the upper nut and washer of the column base part fixing structure in Embodiment 2 of the present invention. It is a figure of the state which removed the upper nut of FIG. It is the top view which looked at FIG. 7 from the front end side of the anchor bolt. It is explanatory drawing of the cross section in BB of FIG. It is a figure which shows the modification of the washer of the column base part fixing structure which concerns on Embodiment 1. FIG. It is an expansion perspective view of the periphery of the upper nut and washer of the column base part fixing structure in Embodiment 3 of the present invention. It is a figure of the state which removed the upper nut of FIG. It is the top view which looked at FIG. 12 from the front end side of the anchor bolt. It is explanatory drawing of the cross section in CC of FIG. It is an expansion perspective view of the periphery of the upper nut and washer of the column base part fixing structure according to Embodiment 4 of the present invention. It is a figure of the state which removed the upper nut of FIG. It is the perspective view which looked at the washer of the column base part fixing structure which concerns on Embodiment 4 of this invention from the fastening surface side which is contacting the baseplate. It is the top view which looked at FIG. 15 from the front end side of the anchor bolt. It is explanatory drawing of the cross section in DD of FIG. It is an expansion perspective view of the periphery of the upper nut and washer of the column base part fixing structure according to Embodiment 5 of the present invention. It is a figure of the state which removed the upper nut of FIG. It is an expansion perspective view of the F section of FIG. It is the top view which looked at FIG. 20 from the front end side of the anchor bolt. It is explanatory drawing of the cross section in EE of FIG.

[Embodiment 1]
1A and 1B illustrate a column base portion fixing structure according to Embodiment 1 of the present invention. FIG. 1A is a side view partially showing a cross section, and FIG. It is a fragmentary sectional view which expands and shows a part.

(Column base fixing structure 100)
In FIG. 1, a column base fixing structure 100 includes an anchor bolt 10 fixed to a foundation concrete 90, a base plate 20 in which an anchor bolt through hole 21 through which the anchor bolt 10 is formed, and a lower end 30 a fixed to the base plate 20. And a lower nut 40 a and an upper nut 40 b that hold the base plate 20 by screwing into the male screw portion of the anchor bolt 10 in a state of passing through the anchor bolt through hole 21. The steel column 30 corresponds to the “column” of the present invention. Moreover, although the lower nut 40a supports the base plate 20 from the lower side, the lower nut 40a may be configured without the lower nut 40a.
Further, the anchor bolt 10 passes through the anchor bolt through hole 21 of the base plate 20, and a washer 50 is disposed between the upper surface 20b of the base plate 20 and the upper nut 40b.
Further, the inner periphery of the anchor bolt through hole 21, the portion of the outer periphery 11 of the anchor bolt 10 that is inside the anchor bolt through hole 21, and a part of the upper surface of the lower nut 40a that supports the base plate 20 from the lower side. The grout material 70 is injected into the grout material injection space 60 formed by a part of the lower surface of the washer 50 and solidified.
The column base fixing structure 100 determines the position of the steel column 30, and then fastens the upper nut 40 b to the anchor bolt 10 and presses and fixes the base plate 20 to the foundation concrete 90 to fix the anchor bolt through hole 21 of the base plate 20. A grout material 70 is injected into the gap with the anchor bolt 10. The horizontal gap between the base plate 20 and the anchor bolt 10 is filled with the grout material 70. With this configuration, when a force is applied to the base plate 20 in the horizontal direction, the force can be transmitted to the anchor bolt 10 via the grout material 70.

(Base plate filling grout 92)
On the upper surface of the foundation concrete 90, a steel frame mortar 91 for adjusting the level (height position) of the base plate 20 in the vertical direction is provided. The steel building mortar 91 is located below the center of the base plate 20. The base plate 20 is placed on the upper surface of the steel mortar 91.
Further, below the base plate 20, a base plate lower filling grout 92 is provided between the upper surface of the foundation concrete 90 and the lower surface of the base plate 20 so as to wrap around the mortar 91 for steel frame construction. The base plate lower filling grout 92 also surrounds the lower nut 40 a that is in contact with the lower surface of the base plate 20. Note that the base-plate lower filling grout 92 is provided in a wider range than the base plate 20 in a plan view (as viewed from the upper side of FIG. 1A). The filling procedure of the base plate filling grout 92 is not limited. For example, a filling frame (mold) surrounding the base plate 20 is installed on the upper surface of the foundation concrete 90, and the grout material is injected inside the filling frame. It is formed by doing.

(Base plate 20)
In the first embodiment, the base plate 20 is substantially rectangular in plan view, and includes a planar lower surface 20a, an upper surface 20b parallel to the lower surface 20a, and an annular upright portion 22 formed at the center of the upper surface 20b. And have. A steel column 30 is placed on the upper surface of the upright portion 22 and joined by means such as welding. The base plate 20 is not limited to the form shown in FIG. For example, when the base plate 20 is formed of a steel plate, the central portion is flat, and the steel column 30 is disposed on the base plate 20 so that welding or the like is performed. Joined by means.

(Washer 50)
2 is an enlarged perspective view of the periphery of the upper nut 40b and the washer 50 of the column base fixing structure 100 of FIG. FIG. 3 is a view showing a state in which the upper nut 40b of FIG. 2 is removed. FIG. 4 is a plan view of FIG. 3 viewed from the distal end side of the anchor bolt 10. FIG. 4A shows a state where the center of the anchor bolt 10 and the center of the washer 50 are aligned, and FIG. 4B shows a state where the washer 50 is biased to one side with respect to the anchor bolt 10. Show.
The washer 50 has a disk shape and includes an assembly hole 51 through which the anchor bolt 10 passes. The assembly hole 51 is opened in the approximate center of the washer 50. The inner diameter of the assembly hole 51 is configured to have a gap with respect to the outer peripheral surface of the male screw portion 12 of the anchor bolt 10 when the anchor bolt 10 is passed. If the clearance between the male screw portion 12 and the inner peripheral surface of the assembly hole 51 is small, it is difficult to pass the anchor bolt 10 through the assembly hole. Further, if the clearance between the male screw portion 12 and the inner peripheral surface of the assembly hole 51 is large, the washer 50 is likely to be displaced with respect to the central axis of the anchor bolt 10, so the size of the clearance is appropriately set. For example, the difference between the outer diameter of the anchor bolt 10 and the inner diameter of the assembly hole 51 is set to 1 mm, and the deviation between the center of the anchor bolt 10 and the center of the washer 50 is about 0.5 mm on one side at most. .

  The surface where the upper nut 40b of the washer 50 contacts and the surface where the washer 50 and the base plate 20 contact are referred to as a fastening surface 52. A groove 53 is formed in the fastening surface 52. The groove 53 penetrates the fastening surface 52 in the vertical direction. Further, the outer peripheral side end portion 54 of the groove portion 53 is opened to the outer peripheral surface 56 of the washer 50. The groove 53 extends from the outer peripheral surface 56 in the direction of the assembly hole 51 and stops in front of the assembly hole 51 to form an inner peripheral end 55. The dimension between the inner peripheral end 55 and the assembly hole 51 is ensured so as not to be deformed according to the material of the washer 50 and the force applied to the washer 50.

  The inner peripheral side end portion 55 of the groove portion 53 is configured to overlap the anchor bolt through hole 21 on the lower surface side of the washer 50. That is, the groove 53 and the anchor bolt through hole 21 communicate with each other. At least the distance from the inner peripheral side end 55 of the groove 53 to the center of the assembly hole 51 is set to be smaller than the radius of the anchor bolt through hole 21. Furthermore, it is preferable that the distance from the inner peripheral side end 55 to the inner peripheral surface of the assembly hole 51 is smaller than the gap between the outer diameter of the anchor bolt 10 and the inner peripheral surface of the assembly hole 51. By being configured in this way, as shown in FIG. 4B, the anchor bolt 10 is assembled close to one groove 53 (the left groove 53 in FIG. 4B). In addition, a path flowing from the groove 53 into the gap between the anchor bolt through hole 21 and the anchor bolt 10 is secured. A structure for determining the position of the washer 50 may be provided so that the center of the assembly hole 51 of the washer 50 does not deviate from the center of the anchor bolt through hole 21. For example, a protrusion may be provided on the upper surface 20b of the base plate 20 so that the washer 50 is assembled at a predetermined position. Alternatively, the washer 50 may have a structure in which the washer 50 is positioned by providing a claw that hooks on the outer periphery of the base plate 20 instead of the disc shape.

  The groove 53 of the washer 50 is formed by punching, for example, by pressing. Since the groove part 53 is comprised by the simple shape, since it does not require the process with comparatively high process costs, such as a cutting process, it can manufacture at a reduced cost. Moreover, although the groove part 53 is extended and formed radially from the center of the washer 50 in the radial direction, it is not limited to this. As long as the groove 53 is formed to extend from the outer peripheral surface 56 side of the washer 50 toward the assembly hole 51, the virtual line extending the groove 53 in the longitudinal direction may not pass through the center of the washer 50. However, at least when the groove 53 is extended in the longitudinal direction, it needs to be formed so as to intersect with the inner peripheral surface of the assembly hole 51.

(Injection of grout material 70)
FIG. 5 is an explanatory diagram of a cross section taken along line AA of FIG. FIG. 5 shows a section along the longitudinal direction of the groove 53 formed in the washer 50 through the center of the anchor bolt 10. The injection of the grout material 70 will be described with reference to FIG.
The grout material 70 is injected into the gap between the anchor bolt through hole 21 and the outer periphery 11 of the anchor bolt 10 from the groove 53 provided in the washer 50. As shown in FIGS. 4 and 5, in the first embodiment, the groove portion 53 is provided to face the assembly hole 51 of the washer 50. In order to inject the grout material 70, a grout material injection pipe is inserted into the outer peripheral side end portion 54 of the groove portion 53. The pipe has a diameter of, for example, 8 mm, and the outer peripheral side end portion 54 of the groove portion 53 is formed so that at least the width direction is equal to or larger than the diameter of the pipe. The pipe is inserted into one of the two groove portions 53 provided opposite to each other with the assembly hole 51 of the washer 50 interposed therebetween, and the grout material 70 is injected. In the first embodiment, the width of the groove 53 is preferably set to 1/10 or more and 1/3 or less of the diameter of the anchor bolt 10. As the male threaded portion 12 of the anchor bolt 10, M24 to M72 screws are usually applied. At this time, the gap between the anchor bolt 10 and the anchor bolt through hole 21 is set to 2.5 mm to 7.5 mm on one side. In injecting the grout material 70 into the gap, the width of the groove is set to 6 mm to 9 mm. By configuring in this way, the amount of the grout material 70 to be injected is not too large, and poor filling is unlikely to occur, so that the strength of the column base portion fixing structure 100 can be ensured appropriately.

  The grout material 70 passes through the groove portion 53 and fills the anchor bolt through hole 21 from the inner peripheral side end portion 55 of the groove portion 53. An inlet portion 57 is formed between the inner peripheral side end portion 55 of the groove portion 53 and the upper end of the inner peripheral surface of the anchor bolt through hole 21, and there is a gap, so that the grout material 70 has the inlet portion 57. And then flows into the anchor bolt through hole 21. When the grout material 70 is filled in the gap between the anchor bolt through hole 21 and the anchor bolt 10, the grout material 70 flows out from the other groove portion 53 that is not the groove portion 53 on the side where the grout material 70 is injected. When the grout material 70 flows out from the other groove 53, it can be determined that the grout material 70 is filled in the gap between the anchor bolt through hole 21 and the anchor bolt 10. Therefore, the grout material 70 can be reliably filled in the gap between the anchor bolt through hole 21 and the anchor bolt 10. Further, since air in the gap between the anchor bolt through hole 21 and the anchor bolt 10 is released from the other groove 53, bubbles remain in the gap between the anchor bolt through hole 21 and the anchor bolt 10, and the strength is reduced. Evil can be suppressed.

  In the first embodiment, the groove portion 53 of the washer 50 is formed at two symmetrical positions across the assembly hole 51, but may be formed at an asymmetric position. Furthermore, it may be formed in many places. Since the groove 53 is formed at two or more places, the grout material 70 is injected from any of the grooves 53 even when the anchor bolt 10 is assembled in one direction of the assembly hole 51. can do. Moreover, when providing the groove part 53 in two or more places, you may arrange | position equally in the circumferential direction centering on the assembly | attachment hole 51. FIG.

(Effect of Embodiment 1)
(1) According to the column base fixing structure 100 according to Embodiment 1, the column base fixing structure 100 includes the anchor bolt 10 fixed to the foundation concrete 90 and the anchor bolt through hole 21 through which the anchor bolt 10 passes. The base plate 20 is formed, the steel column 30 whose lower end is fixed to the base plate 20, and the anchor bolt 10 in a state of passing through the anchor bolt through hole 21. An upper nut 40b that is pressed against and fastened, and a washer 50 that has an assembly hole 51 through which the anchor bolt 10 passes and is sandwiched between the upper nut 40b and the base plate 20. The washer 50 includes a groove 53 that is provided on the fastening surface 52 with which the upper nut 40b or the base plate 20 comes into contact and extends from the outer peripheral side of the washer 50 toward the assembly hole 51. The groove 53 communicates with the gap between the anchor bolt 10 and the anchor bolt through hole 21.
With this configuration, the grout material 70 is injected into the gap between the anchor bolt through hole 21 and the anchor bolt 10 using the groove 53 provided in the washer 50 in a state where the upper nut 40b is fastened. be able to. By simply applying the washer 50, it is possible to easily inject the grout material 70 after the upper nut 40b is fastened, and it is not necessary to provide a structure for injecting the grout material 70 into the base plate 20; A fixed structure can be provided.

(2) According to the column base portion fixing structure 100 according to the first embodiment, the groove portion 53 has a distance from the inner peripheral side end portion 55 located on the inner peripheral side of the washer 50 to the center of the assembly hole 51. It is smaller than the radius of 20 anchor bolt through holes 21.
By being configured in this manner, the groove 53 communicates with the gap between the anchor bolt through hole 21 and the anchor bolt 10, and a route for injecting the grout material 70 after the upper nut 40b is fastened is ensured.

(3) According to the column base portion fixing structure 100 according to the first embodiment, the groove portion 53 has the outer peripheral side end portion 54 located on the outer peripheral side of the washer opening in the outer peripheral surface 56 of the washer 50.
By being configured in this way, the outer peripheral side end portion 54 of the groove portion 53 communicates with the gap between the anchor bolt through hole 21 and the anchor bolt 10, and for example, a grout material is inserted by inserting a pipe from the outer peripheral side end portion 54. 70 injections are possible.

(4) According to the column base portion fixing structure 100 according to the first embodiment, the groove portion 53 penetrates the washer 50 in a direction perpendicular to the fastening surface 52.
With this configuration, a path for injecting the grout material 70 surrounded by the lower surface of the upper nut 40b, the groove 53, and the upper surface 20b of the base plate 20 is formed. For example, a pipe or the like can be inserted into this path, and the grout material 70 can be injected from the pipe. Therefore, without providing a structure for injecting the grout material 70 in the base plate 20 in particular, anchor bolt penetration is possible after fastening the upper nut 40b. The grout material 70 can be injected into the gap between the hole 21 and the anchor bolt 10.

(5) According to the column base fixing structure 100 according to the first embodiment, the width of the groove 53 is not less than 1/10 and not more than 1/3 of the outer diameter of the anchor bolt 10.
By being configured in this way, for example, a pipe or the like can be inserted into the groove 53 and the grout material 70 can be injected from the pipe. And since the groove part 53 is too wide, it can suppress that the grout material 70 flows out of the groove part 53, without entering into the clearance gap between the anchor bolt through-hole 21 and the anchor bolt 10. FIG. Further, it is possible to avoid a situation in which the width of the groove 53 is narrow and the grout material 70 cannot be injected into the groove 53. In addition, since the amount of the grout material 70 to be injected is not too large and filling failure hardly occurs, the strength of the column base portion fixing structure 100 can be appropriately secured.

(6) According to the column base portion fixing structure 100 according to the first embodiment, the grout material 70 injected into the gap between the anchor bolt 10 and the anchor bolt through hole 21 is further provided.
With this configuration, when a force is applied to the base plate 20 in the horizontal direction, the force can be transmitted to the anchor bolt 10 via the grout material 70.

(7) According to the column base portion fixing structure 100 according to the first embodiment, the lower nut 40a that is screwed into the anchor bolt 10 that has passed through the anchor bolt through hole 21 and supports the base plate 20 from below is provided. In addition. The grout material 70 is injected into a space formed by the inner periphery of the anchor bolt through hole 21, a part of the outer periphery of the anchor bolt 10, a part of the washer 50, and a part of the lower nut 40a.
With this configuration, when a force is applied to the base plate 20 in the horizontal direction, the force can be transmitted to the anchor bolt 10 via the grout material 70. Further, when a force is applied in the direction in which the steel column 30 is tilted (when a moment load is applied to the base plate 20), the load applied downward to the anchor bolt 10 can be received by the lower nut 40a. Therefore, a stronger column base fixing structure can be obtained as compared with a column base fixing structure having no lower nut 40a.

(8) According to the column base fixing structure 100 according to the first embodiment, the groove 53 extends from the outer periphery of the washer 50 toward the center of the assembly hole 51.
By comprising in this way, the path | route which connects the clearance gap between the anchor bolt through-hole 21 and the anchor bolt 10 from the exterior can be comprised in the shortest. Further, since the size of the groove 53 of the washer 50 can be minimized, the strength of the washer 50 can be ensured while ensuring a route for injecting the grout material 70.

(9) According to the column base portion fixing structure 100 according to Embodiment 1, the groove portions 53 are arranged at a plurality of locations on the fastening surface 52.
By being configured in this way, when the grout material 70 is injected into the gap between the anchor bolt through hole 21 and the anchor bolt 10 from the outside, one groove 53 serves as an inlet for injecting the grout 70 and the other groove 53 can be used as an air vent for venting air in the gap between the anchor bolt through hole 21 and the anchor bolt 10. Further, after the grout material 70 is filled in the gap between the anchor bolt through hole 21 and the anchor bolt 10, the grout material 70 flows out from the other groove 53, so that the grout material 70 is properly filled from the outside. It can be visually recognized. Further, even when the anchor bolt 10 is assembled in one direction of the assembly hole 51, the grout material 70 can be injected from any of the groove portions 53.

[Embodiment 2]
The column base fixing structure 200 according to the second embodiment is obtained by changing the washer 50 with respect to the column base fixing structure 100 in the first embodiment, and the other forms are the same as those in the first embodiment. Therefore, the same reference numerals are given to the same or corresponding parts. In the second embodiment, the description will be focused on the changes made to the first embodiment.

  FIG. 6 is an enlarged perspective view of the periphery of the upper nut 40b and the washer 250 in the column base fixing structure 200 according to Embodiment 2 of the present invention. FIG. 7 is a view showing a state where the upper nut 40b of FIG. 6 is removed. FIG. 8 is a plan view of FIG. 7 viewed from the distal end side of the anchor bolt 10. In the washer 250 according to the second embodiment, the outer peripheral side end portion 254 of the groove portion 253 is not opened in the outer peripheral surface 256 of the washer 250 and is located on the inner side of the outer peripheral surface 256. The two-dot chain line shown in FIG. 8 shows the outer shape of the upper nut 40b when the upper nut 40b is attached.

  As shown in FIG. 8, the outer peripheral side end 254 of the groove 253 is located outside the outer peripheral part of the upper nut 40b. More specifically, the distance from the inner peripheral surface of the assembly hole 251 of the washer 250 to the outer peripheral side end 254 of the groove 253 is from the threaded portion 41b of the upper nut 40b to the anchor bolt 10 to the outer periphery of the upper nut 40b. Longer than distance is good. That is, the distance L shown in FIG. 8 is preferably set larger than the distance r. By being configured in this way, even when the gap between the inner peripheral surface of the assembly hole 251 of the washer 250 and the outer peripheral surface of the anchor bolt 10 is assembled biased toward the one groove portion 253 side, the outer peripheral end portion 254 is assembled. Always comes out on the outer peripheral side of the upper nut 40b.

  Further, the outer peripheral surface 256 of the washer 250 is positioned outside the outer peripheral side end 254 of the groove portion 253, and the portion where the meat of the washer 250 in the portion from the groove portion 253 to the outer peripheral surface 256 is connected has a necessary strength. Therefore, it is necessary to secure a certain width. Therefore, the outer diameter of the washer 250 is preferably set to be twice or more the diameter of the anchor bolt 10. By being configured in this way, the strength of the washer 250 itself can be ensured while ensuring a path through which the grout material 70 can be reliably injected from the outside. Further, the washer 250 is not limited to the disk shape, and may be a shape in which only the outer peripheral portion of the portion where the groove portion 253 is installed is enlarged, for example. In the case where only the outer peripheral portion of the portion where the groove portion 253 of the washer 250 is installed is enlarged, the largest portion of the outer dimension of the washer 250 is preferably set to be twice or more the diameter of the anchor bolt 10.

  FIG. 9 is an explanatory diagram of a cross section taken along line BB of FIG. Also in the second embodiment, the grout material 70 is injected from the outer peripheral side end portion 254 of the groove portion 253. However, unlike Embodiment 1, a pipe for injecting the grout material 70 is inserted and injected from above the outer peripheral side end 254 of the groove 253. Alternatively, since the outer peripheral side of the outer peripheral end 254 of the groove 253 is not opened, the grout material 70 may be poured onto the outer peripheral end 254 of the groove 253 from above the fastening surface of the washer 250. Since the outer peripheral side end 254 of the groove portion 253 is closed as shown in FIG. 9, even if the grout material 70 is poured in this way, the grout material 70 extends from the outer peripheral side end 254 to the outer peripheral side of the washer 250. Will not leak.

  FIG. 10 is a view showing a modification of the washer 250 of the column base fixing structure 100 according to the first embodiment. For example, as shown in FIG. 10, the groove 253 provided in the washer 250 may be installed in a 90 ° positional relationship with respect to the center of the washer 250. When the outer peripheral end 254a of one groove 253a provided in the washer 250 overlaps the apex of the upper nut 40b, the width of the outer peripheral end 254a protruding outward from the apex of the upper nut 40b is small, The gap for inserting the pipe for injecting the grout material 70 may become small. However, as shown in FIG. 10, there is a case where the pipe cannot be inserted into the outer peripheral side end 254a of one groove 253a because the groove 253a and the groove 253b are arranged in a 90 ° positional relationship. Even if it exists, the outer periphery side edge part 254b of the other groove part 253b can ensure the clearance gap which can insert a pipe. The positional relationship between the groove portion 253a and the groove portion 253b is the same even when the groove portion 253a and the groove portion 253b are disposed at a 135 ° positional relationship with respect to the center of the washer 250.

(Effect of Embodiment 2)
(10) According to the column base portion fixing structure 200 according to the second embodiment, the groove portion 253 has a distance between the outer peripheral side end portion 254 located on the outer peripheral side of the washer 250 and the inner peripheral surface of the assembly hole 251. The distance from the threaded portion 41b of the upper nut 40b to the anchor bolt 10 to the outer periphery of the upper nut 40b is larger.
By being configured in this manner, in the state in which the upper nut 40b is fastened, the outer peripheral side end portion 254 of the groove portion 253 protrudes outside the outer periphery of the upper nut 40b, so that the same as described in the above (1) Effects can be obtained. Further, since the outer peripheral side end 254 of the groove 253 is not opened, the grout material 70 that has flowed into the groove 253 is unlikely to flow out to the outer peripheral surface 256 side of the washer 250, so that the grout material 70 can be injected efficiently.

(11) According to the column base portion fixing structure 200 according to the second embodiment, the washer 250 has at least a portion having the largest outer dimension that is twice or more the outer diameter of the anchor bolt 10.
By being configured in this manner, an appropriate thickness can be secured between the outer peripheral side end 254 of the groove 253 and the outer peripheral surface 256 of the washer 250, so that a path for injecting the grout material 70 is provided. The strength can be secured properly.

[Embodiment 3]
The column base fixing structure 300 according to the third embodiment is obtained by changing the washer 50, 250 with respect to the column base fixing structure 100, 200 in the first and second embodiments, and excludes this. Since the form is the same as in Embodiment 1 and Embodiment 2, the same reference numerals are given to the same or corresponding parts. In the third embodiment, the description will be focused on the changes made to the first and second embodiments.

  FIG. 11 is an enlarged perspective view of the periphery of the upper nut 40b and the washer 350 of the column base fixing structure 300 according to Embodiment 3 of the present invention. 12 is a view showing a state in which the upper nut 40b of FIG. 11 is removed. FIG. 13 is a plan view of FIG. 12 viewed from the distal end side of the anchor bolt 10. In the washer 350 according to the third embodiment, the outer peripheral side end 354 of the groove portion 353 does not open to the outer peripheral surface 56 of the washer 350, and the inner peripheral end 355 communicates with the assembly hole 351. Therefore, the position of the outer peripheral side end 354 of the groove 353 is set similarly to the position of the outer peripheral end 254 of the groove 253 in the second embodiment.

  FIG. 14 is an explanatory diagram of a cross section taken along the line CC of FIG. Also in the third embodiment, the grout material 70 is injected from the outer peripheral side end 354 of the groove 353. The grout material 70 injected from the outer peripheral side end portion 354 is transmitted through the groove portion 353 to the anchor bolt through hole 21 and the anchor from the inlet portion 357 which is a gap formed by the inner peripheral side end portion 355 and the anchor bolt through hole 21. It flows into the gap with the bolt 10.

  As shown in FIG. 14, in the third embodiment, since the inner peripheral side end portion 355 is in communication with the assembly hole 351, the gap between the anchor bolt through hole 21 and the anchor bolt 10 from the groove portion 353. The inlet portion 357 that flows into is secured by the size of the gap between the anchor bolt 10 and the anchor bolt through hole 21. That is, as shown in FIG. 13B, the anchor bolt 10 is assembled close to one groove portion 353 (the left groove portion 353 in FIG. 13B), and the anchor bolt through-hole 21 is biased to anchor bolts. Even if it is in contact with 10, there is a gap due to the groove of the threaded portion of the anchor bolt 10 where the washer 350 and the anchor bolt 10 are in contact. Thereby, the portion where the washer 350 and the anchor bolt 10 are in contact acts as a hole through which air escapes when the grout material 70 is injected. The other inner peripheral side end portion 355 secures a path from the groove portion 353 to the gap between the anchor bolt through hole 21 and the anchor bolt 10 via the inlet portion 357. With the above configuration, the grout material 70 can be injected even in the state shown in FIG.

(Effect of Embodiment 3)
(12) According to the column base portion fixing structure 300 according to the third embodiment, the groove portion 353 has the inner peripheral side end portion 355 located on the inner peripheral side of the washer 350 communicating with the assembly hole 351.
By being configured in this way, the width of the inlet portion 357 through which the grout material 70 flows into the gap between the anchor bolt 10 and the anchor bolt 10 from the groove portion 353 can be secured regardless of the assembled state of the washer 350. 70 can be properly filled.

[Embodiment 4]
The column base fixing structure 400 according to the fourth embodiment is obtained by changing the washer 50, 250, 350 with respect to the column base fixing structure 100, 200, 300 in the first to third embodiments. Since the other forms are the same as those in the first to third embodiments, the same or corresponding parts are denoted by the same reference numerals. Further, in the fourth embodiment, description will be made centering on changes from the first to third embodiments.

  FIG. 15 is an enlarged perspective view of the periphery of the upper nut 40b and the washer 450 of the column base fixing structure 400 according to Embodiment 4 of the present invention. FIG. 16 is a view showing a state in which the upper nut 40b of FIG. 15 is removed. FIG. 17 is a perspective view of the washer 450 of the column base fixing structure 400 according to Embodiment 4 of the present invention as viewed from the fastening surface 52 side in contact with the base plate 20. FIG. 18 is a plan view of FIG. 15 viewed from the distal end side of the anchor bolt 10. As shown in FIG. 17, in the washer 450 in the fourth embodiment, the groove 453 does not penetrate in the direction perpendicular to the fastening surface 52. In other words, the groove portion 453 has a groove shape opened in the direction of one of the fastening surfaces 52 (on the base plate 20 side). The groove 453 has an outer peripheral side end 454 that opens to the outer peripheral surface 456 of the washer 450 and an inner peripheral side end 455 that communicates with the assembly hole 451. The washer 450 is assembled with the groove 453 facing the base plate 20 side. Note that the washer 450 is a flat surface when viewed from the upper side in FIG. 16, and the strength of the washer 450 is adequately secured by ensuring the thickness between the flat surface and the bottom of the groove 453. Can be secured.

FIG. 19 is an explanatory diagram of a cross section taken along line DD of FIG.
Also in the fourth embodiment, the grout material 70 is injected from the outer peripheral side end 454 of the groove 453. The grout material 70 injected from the outer peripheral side end portion 454 is transmitted through a tubular space surrounded by the groove portion 453 and the upper surface 20b of the base plate 20, and from the inner peripheral side end portion 455 to the anchor bolt through hole 21, the anchor bolt 10 and the like. Flows into the gap. Since the groove 453 has an opening directed toward the base plate 20, the inner peripheral end 455 communicates with the gap between the anchor bolt through hole 21 and the anchor bolt 10. Therefore, as shown in FIG. 18B, the anchor bolt 10 is assembled close to one of the groove portions 453 (the left-side groove portion 453 in FIG. 18B), and the anchor bolt through holes 21 are biased to anchor bolts. Even if it is in contact with 10, there is a gap due to the groove of the threaded portion of the anchor bolt 10 where the washer 450 and the anchor bolt 10 are in contact. Thereby, the portion where the washer 450 and the anchor bolt 10 are in contact acts as a hole through which air escapes when the grout material 70 is injected. The other inner peripheral end 455 is provided with an inlet portion 457 that flows from the groove 453 into the gap between the anchor bolt through hole 21 and the anchor bolt 10. With the above configuration, the grout material 70 can be injected even in the state shown in FIG.

  In the fourth embodiment, a grout material injection pipe is inserted into the outer peripheral side end 454 of the groove 453 in order to inject the grout material 70. The pipe has a diameter of 8 mm, for example, and the outer peripheral side end 454 of the groove 453 is formed so that the dimension in the width direction and the thickness direction of the washer 450 is at least larger than the diameter of the pipe. The depth of the groove 453 is formed so that a pipe for injecting the grout material 70 can be inserted. Further, since it is necessary to secure the strength of the thin portion in the thickness direction of the washer 450 formed with the groove portion 453, the depth of the groove portion 453 is the maximum thickness of the washer 450 after ensuring the dimension into which the pipe can be inserted. It is limited to 0.83 times.

(Effect of Embodiment 4)
(13) According to the column base portion fixing structure 400 according to the fourth embodiment, the groove portion 453 is formed by denting a part of the fastening surface 52 of the washer 450. That is, the groove portion 453 that does not penetrate the fastening surface 52 in the vertical direction and includes the groove portion 453 that communicates with the outer peripheral surface 456 of the washer 450 and the assembly hole 451.
By being configured in this manner, the column base fixing structure 400 according to the fourth embodiment secures the strength of the washer 450 appropriately by the groove 53 that does not penetrate the fastening surface 52, while the above (1). The effects similar to those described in (3) and (5) to (12) can be obtained.

[Embodiment 5]
In the column base fixing structure 500 according to the fifth embodiment, the washers 50, 250, 350, and 450 are changed with respect to the column base fixing structures 100, 200, 300, and 400 in the first to fourth embodiments. Since the configuration excluding this is the same as in the first to fourth embodiments, the same or corresponding portions are denoted by the same reference numerals. Further, in the fifth embodiment, the description will be focused on the changes made to the first to fourth embodiments.

FIG. 20 is an enlarged perspective view of the periphery of the upper nut 40b and the washer 550 of the column base fixing structure 500 according to Embodiment 5 of the present invention. FIG. 21 is a view showing a state in which the upper nut 40b of FIG. 20 is removed. FIG. 22 is an enlarged perspective view of a portion F in FIG. FIG. 23 is a plan view of FIG. 20 viewed from the distal end side of the anchor bolt 10.
As shown in FIGS. 20 to 21, the washer 550 in the fifth embodiment includes a groove portion 553 that does not penetrate the fastening surface 52 in the vertical direction, similarly to the washer 450 according to the fourth embodiment. In other words, the groove portion 553 has a groove shape that opens in the direction of the fastening surface 52 on one side (on the upper nut 40b side). The groove portion 553 has an outer peripheral end portion 554 that opens to the outer peripheral surface 556 of the washer 550 and an inner peripheral end portion 555 that communicates with the assembly hole 551. However, unlike the washer 450 according to the fourth embodiment, the groove bottom portion 553a of the inner peripheral side end portion 555 of the groove portion 553 is deleted before reaching the assembly hole 551 as shown in FIG. That is, the groove bottom end surface 558a that is the end surface on the inner peripheral side of the groove bottom 553a is located on the outer peripheral side of the inner peripheral surface 559 of the assembly hole 551. 23A, when the washer 550 is viewed from above, the inner peripheral surface 559 of the assembly hole 551 is cut out to the outer peripheral side along the groove portion 553, and a part of the assembly hole 551 is formed. Has a shape enlarged to the outer peripheral side. In other words, the washer 550 has a notch shape 558 in which the inner peripheral surface 559 of the assembly hole 551 is notched toward the outer peripheral side of the washer 550. A groove portion 553 communicates with a notch shape 558 that penetrates the washer 550 in the vertical direction.

  In the fifth embodiment, the cutout shape 558 is provided continuously to the groove bottom end surface 558a that is a surface facing the center direction of the washer 550 and the side surface 553b of the groove portion 553, and extends downward in front of the assembly hole 551. A notch-shaped side surface 558b. In Embodiment 5, the notch-shaped side surface 558b is provided with the same width as the width of the groove portion 553. However, if the notch shape 558 and the groove portion 553 communicate with each other, the notch-shaped side surface 558b is provided with a width different from that of the groove portion 553. May be. When the notch shape 558 is set to be larger than the width of the groove portion 553, the inlet portion 557 into which the grout material 70 flows is widened, so that the grout material 70 flows into the gap between the anchor bolt 10 and the anchor bolt through hole. There is an advantage that it becomes easy.

  FIG. 23B shows a state in which the washer 550 is assembled to the anchor bolt 10 so as to be biased toward the one groove 553. The washer 550 has the groove bottom portion of the inner peripheral side end portion 555 of the groove portion 553 cut out as described above, and the anchor bolt 10 is in contact with the inner peripheral surface 559 of the assembly hole 551 as shown in FIG. Further, even if the anchor bolt through hole 21 is biased and is in contact with the anchor bolt 10, there is a gap due to the groove of the threaded portion of the anchor bolt 10 where the washer 550 and the anchor bolt 10 are in contact. Thereby, the portion where the washer 550 and the anchor bolt 10 are in contact acts as a hole through which air escapes when the grout material 70 is injected. The other inner peripheral end portion 555 always has a gap between the groove bottom end surface 558a and the outer periphery 11 of the anchor bolt 10 to form an inlet portion 557 into which the grout material 70 can flow. With the above configuration, the grout material 70 can be injected even in the state shown in FIG.

  24 is an explanatory diagram of a cross section taken along line EE of FIG. As shown in FIG. 24, the inlet portion 557, which is a gap between the outer periphery 11 of the anchor bolt 10 and the groove bottom end surface 558a, has an inner peripheral side end portion 555 of the groove portion 553 and the anchor bolt through hole 21 in the vertical direction. Is in communication. The grout material 70 injected from the outer peripheral side end portion 554 of the groove portion 553 passes through the groove portion 553, passes through the inlet portion 557, and is injected into the gap between the anchor bolt through hole 21 and the anchor bolt 10.

(14) According to the column base portion fixing structure 500 according to the fifth embodiment, the washer 550 is provided with the notch shape 558 toward the outer peripheral side of the washer 550 on the inner peripheral surface 559 of the assembly hole 551. The notch shape 558 penetrates the washer 550 in a direction perpendicular to the fastening surface 52. The groove portion 553 communicates with the notch shape 558.
With this configuration, the effect described in (13) above can be obtained, and the groove portion 553 is configured to face upward, so that the grout material 70 can be injected into the groove portion 553 from above. Further, the inlet portion 557 into which the grout material 70 flows can be widened, and there is an advantage that the injection can be performed without applying excessive pressure to the grout material 70.

  Since the present invention is as described above, and the anchor bolt and the base plate are firmly fixed, it is widely used as a column base fixing structure of various forms in which a grout material is injected between the anchor bolt through hole and the anchor bolt of the base plate. Can be used.

DESCRIPTION OF SYMBOLS 10 Anchor bolt 11 Outer periphery 12 Male thread part 20 Base plate 20a Lower surface 20b Upper surface 21 Anchor bolt through-hole 22 Upright part 30 Steel pillar 30a Lower end 40a Lower nut 40b Upper nut 41b Screw part 50 Washer 51 Assembly hole 52 Fastening surface 53 Groove part 54 Outer part Side end portion 55 Inner peripheral side end portion 56 Outer peripheral surface 57 Entrance portion 60 Grout material injection space 70 Grout material 90 Foundation concrete 91 Steel frame mortar 92 Base plate lower filling grout 100 Column base fixing structure 200 Column base fixing structure 250 Washer 251 Assembly hole 253 Groove portion 254 Outer peripheral end portion 255 Inner peripheral end portion 256 Outer peripheral surface 300 Column base fixing structure 350 Washer 351 Assembly hole 353 Groove portion 354 Outer peripheral end 355 Inner peripheral end 357 Inlet portion 400 Column base Part fixing structure 450 Washer 451 assembly 453 Groove 454 Outer peripheral end 455 Inner peripheral end 457 Entrance portion 500 Column base fixing structure 550 Washer 551 Assembly hole 553 Groove 553a Groove bottom 553b Side surface 554 Outer peripheral end 555 Inner peripheral end 556 Outer peripheral surface 557 Inlet Portion 558 Notch shape 558a Groove bottom end surface 558b Notch shape side surface 559 Inner circumferential surface L Distance r Distance

Claims (12)

Anchor bolts fixed to the foundation concrete,
A base plate in which an anchor bolt through-hole through which the anchor bolt passes is formed;
A column base having a lower end fixed to the base plate;
An upper nut that is screwed into the anchor bolt in a state of passing through the anchor bolt through hole, and presses and fastens the base plate to the side where the foundation concrete is located;
An assembly hole through which the anchor bolt passes, and a washer sandwiched between the upper nut and the base plate,
The washer is
A groove portion provided on a fastening surface to which the upper nut or the base plate comes into contact and extending from the outer peripheral side of the washer toward the assembly hole ;
A notch shape provided on the inner peripheral surface of the assembly hole and directed toward the outer peripheral side of the washer ;
The notch shape is
Penetrating the washer in a direction perpendicular to the fastening surface, communicating with the gap between the anchor bolt and the anchor bolt through hole,
The groove is
A part of the fastening surface is recessed and an outer peripheral side end located on the outer peripheral side of the washer opens to the outer peripheral surface of the washer and communicates with the notch shape.
Column base fixing structure.   The washer is
  The column base portion fixing structure according to claim 1, wherein the groove portion is disposed toward the upper nut side. Anchor bolts fixed to the foundation concrete,
A base plate in which an anchor bolt through-hole through which the anchor bolt passes is formed;
A column base having a lower end fixed to the base plate;
An upper nut that is screwed into the anchor bolt in a state of passing through the anchor bolt through hole, and presses and fastens the base plate to the side where the foundation concrete is located;
An assembly hole through which the anchor bolt passes, and a washer sandwiched between the upper nut and the base plate,
The washer is
Provided with a groove portion provided on a fastening surface with which the upper nut or the base plate comes into contact and extending from an outer peripheral side of the washer toward the assembly hole;
The groove is
An inner peripheral end that passes through the washer in a direction perpendicular to the fastening surface, an outer peripheral end located on the outer peripheral side of the washer opens on an outer peripheral surface of the washer, and is located on an inner peripheral side of the washer Is located on the outer peripheral side of the washer with respect to the assembly hole,
The inner peripheral side end of the groove is
Communicating with the gap between the anchor bolt and the anchor bolt through hole,
Column base fixing structure. Anchor bolts fixed to the foundation concrete,
A base plate in which an anchor bolt through-hole through which the anchor bolt passes is formed;
A column base having a lower end fixed to the base plate;
An upper nut that is screwed into the anchor bolt in a state of passing through the anchor bolt through hole, and presses and fastens the base plate to the side where the foundation concrete is located;
An assembly hole through which the anchor bolt passes, and a washer sandwiched between the upper nut and the base plate,
The washer is
Provided with a groove portion provided on a fastening surface with which the upper nut or the base plate comes into contact and extending from an outer peripheral side of the washer toward the assembly hole;
The groove is
An inner periphery that penetrates the washer in a direction perpendicular to the fastening surface, an outer peripheral end located on the outer peripheral side of the washer is located on the inner side of the outer peripheral surface of the washer, and is located on the inner peripheral side of the washer The side end is located on the outer peripheral side of the washer with respect to the assembly hole,
The inner peripheral side end of the groove is
Communicating with the gap between the anchor bolt and the anchor bolt through hole,
Column base fixing structure. The groove is
The distance between the outer peripheral end located on the outer peripheral side of the washer and the inner peripheral surface of the assembly hole is larger than the distance from the threaded portion of the upper nut to the anchor bolt to the outer periphery of the upper nut. The column base fixing structure according to any one of claims 1 to 4, which is large. The groove is
The distance from the inner peripheral side edge part located in the inner peripheral side of the said washer to the center of the said assembly hole is smaller than the radius of the said anchor bolt through-hole of the said base plate , In any one of Claims 1-5. Column base fixing structure as described. The groove is
The column base fixing structure according to any one of claims 1 to 6 , wherein the width is 1/10 or more and 1/3 or less of the outer diameter of the anchor bolt. The washer is
The column base fixing structure according to any one of claims 1 to 7 , wherein at least a portion having the largest outer dimension is at least twice the outer diameter of the anchor bolt. The column base fixing structure according to any one of claims 1 to 8 , further comprising a grout material injected into a gap between the anchor bolt and the anchor bolt through hole. It further includes a lower nut that is screwed into the anchor bolt in a state of passing through the anchor bolt through hole and supports the base plate from below.
The grout material is
An inner circumference of the anchor bolt through hole, and a part of the outer circumference of the anchor bolt, and a part of the washer, and a portion of the lower nut, is injected into the space formed by, according to claim 9 Column base fixing structure. The groove is
The column base fixing structure according to any one of claims 1 to 10 , which extends from an outer peripheral portion of the washer toward a center of the assembly hole. The groove is
The column base fixing structure according to any one of claims 1 to 11 , which is disposed at a plurality of locations on the fastening surface.

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