JP3729899B2 - Steel anchor method and steel anchor device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel anchor used for a steel column base. More specifically, the present invention relates to a steel anchor technique suitable as an exposure fixing anchor in which the fixing portion between the upper end portion of the anchor bolt and the base plate on the column base is exposed on the foundation concrete.
[0002]
[Prior art]
Conventionally, as a means for fixing a column base of a building or the like to a foundation structure, in this type of steel column base anchor, a J-type or L-type anchor bolt or an anchor bolt having a fixing plate at the bottom is used. What was used was common. On the other hand, in the case of a light structure, it has been known to use U-shaped anchor bolts whose ends are threaded (Japanese Utility Model Publication Nos. 55-81144 and 56-134947). Furthermore, recently, attempts have been made to use U-shaped anchor bolts for steel frames (Japanese Patent Publication No. 3-67165).
[0003]
[Problems to be solved by the invention]
By the way, in the prior art using the U-shaped anchor bolts for steel frames, the two U-shaped anchor bolts are arranged in parallel. Since the tensile force acts on both vertical parts of the same U-shaped anchor bolt on the side close to the external force at the same time, the horizontal part connecting the lower ends of both vertical parts is As a result of functioning as a common fixing member, the fixing action is halved.
The present invention relates to the improvement of the prior art using this U-shaped anchor bolt for steel frames, and further devise to increase the anchoring action as an anchor device and extend the anchor embedding depth. The purpose is to provide a secure anchor technology.
[0004]
[Means for Solving the Problems]
The present invention to achieve the above objects, using the four U-shaped anchor bolt, a virtual through the steel columns fixed portion of each of the vertical portions pixels those of the anchor bolt of the U-shaped anchor bolt The foundation concrete is arranged in a diagonal region divided by orthogonal straight lines connecting the midpoints of the opposite sides of the quadrilateral , and the lateral portions of the U-shaped anchor bolts are arranged in a cross-beam shape. The technical means of burying was adopted.
[0005]
[Action]
According to the present invention, as described above, since the vertical portions of the U-shaped anchor bolts are arranged in diagonal regions, the virtual four sides passing through the steel frame fixing portions of the anchor bolts. When an external force perpendicular to any side of the shape acts on the steel column, a U-shape is sandwiched across a straight line connecting the midpoints of the opposite sides perpendicular to the virtual quadrilateral external force. Tensile force is applied to one vertical part of the anchor bolt on the side where the external force is applied, and no tensile force is applied to the other vertical part. Therefore, the entire horizontal part connecting the lower ends of the two vertical parts is the fixing body. As a result, the pulling resistance will be demonstrated. Further, in that case, the other vertical portion on the side where no force acts acts to suppress the deformation of the horizontal portion, so that the fixing action by the horizontal portion is further reinforced. In addition, since each vertical part of each U-shaped anchor bolt is arrange | positioned so that it may be located in the area | region on a diagonal, it can respond to the external force of the orthogonal | vertical direction of any side of the said virtual quadrilateral.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention, before SL using four U-shaped anchor bolt, is arranged so as to connect the vertical section of two each positioned a vertical portion of the total eight in the region on the diagonal, respectively, and each U-shaped the horizontal portion of the anchor bolt may Re shall der use in a state arranged in parallel crosses. In addition, you may implement as a combination form which added the U-shaped anchor bolt according to the conventional arrangement method to the U-shaped anchor bolt according to the arrangement method of this invention. In this case, it is obvious that the U-shaped anchor bolt according to the arrangement of the present invention itself exhibits the above-described action of the present invention.
[0007]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is a perspective view of the assembled state of the real施例shown by omitting the foundation concrete of the present invention, FIG 2 shows a longitudinal sectional view thereof. In the figure, 1 is a steel column and 2 is a base plate, which is erected on a foundation concrete 4 via a non-shrinkable mortar 3 for filling. In this embodiment, using the four U-shaped anchor bolt 5-8, it is formed eight steel columns fixed part. Each of the U-shaped anchor bolts 5 to 8 is processed into a substantially U-shape including a vertical portion a, b on both sides and a horizontal portion c connecting the lower ends of the vertical portions a, b. Screw portions 9 for fixing the steel column 14 are respectively formed at the upper end portions of b, and nuts 10 and 11 are screwed onto the total eight screw portions 9 to fix the steel column 1. that it is configured to. These U-shaped anchor bolt 5-8, may be adapted to share formed in the same size, and constructed as the projection amount of the screw portion 9 is changed between them matching dimensions Also good. In the figure, 12 is a square washer. In addition, a so-called accessory plate for holding a gap (not shown) in which insertion holes through which the respective vertical portions a and b can be inserted is provided in the upper portion of each U-shaped anchor bolt 5 to 8 and, if necessary, in the lower portion. You may comprise.
[0008]
FIG. 3 shows an explanatory diagram regarding the arrangement of U -shaped anchor bolts. In the figure, 13 is a virtual quadrilateral drawn through the steel column fixing portions of the vertical portions 5a to 8b of the U-shaped anchor bolts 5 to 8, that is, the screw portions 9, and the midpoints of the opposite sides are connected. The region is divided into four regions A to D by orthogonal straight lines 14 and 15. And the vertical parts 5a-8b of each U-shaped anchor bolt 5-8 are arrange | positioned so that it may be located in the area | region A, C or B, D on a diagonal, respectively. That is, one vertical portion 5a, 8a of the U-shaped anchor bolts 5 and 8 is disposed in the region A, and the other vertical portion 5b, 8b is disposed in the diagonal region C. Similarly, one of the vertical portions 6a and 7a of the U-shaped anchor bolts 6 and 7 is disposed in the region B, and the other vertical portions 6b and 7b are disposed in the diagonal region D. Here, what is important is that the vertical portions on both sides of the U-shaped anchor bolt is positioned within the region A and C or B and D on the diagonal, can be modified satisfies that requirement is there. In addition, the horizontal parts 5c-8c of each U-shaped anchor bolt 5-8 are arrange | positioned like a cross-beam like illustration. Thereby, since the horizontal portions 5c to 8c of all the U-shaped anchor bolts 5 to 8 are concentrated on the central portion and do not overlap each other, the bulk does not increase so much and the workability is good.
[0009]
It will be described next action state of each part when an external force is applied to the embodiment with reference to FIG. As shown in the figure, when an external force F is applied to the steel column 14, a moment M with the lower end portion of the steel column 14 as a fulcrum acts. As a result, a tensile force acts on the aforementioned regions A and D on the side where the external force F is applied around the straight line 14, and a compressive force acts on the regions B and C side. . Therefore, a tensile force acts on one vertical part 5a, 6b, 7b, 8a of each U-shaped anchor bolt 5-8. On the other hand, as a result of the compressive force acting on the regions B and C, a compressive stress σc is generated on the foundation concrete 4 side as shown in the figure, and the other vertical portions 5b, 6a, 7a, No tensile force acts on 8b. As a result, in each U-shaped anchor bolt 5-8, as described above, one vertical portion 5a, 6b, 7b, 8a functions as an anchor, and each horizontal portion 5-8c as a whole is a fixing portion. As a result, a pulling resistance force is generated. Further, in this case, the other vertical portions 5b, 6a, 7a, 8b on the side where no tensile force is applied function so as to suppress the deformation of the horizontal portions 5c-8c. As a result, fixing by the horizontal portions 5c-8c is performed. The action will be further reinforced. When the external force F acts in the reverse direction, the one vertical portion 5a, 6b, 7b, 8a and the other vertical portion 5b, 6a, 7a, 8b function in reverse. Further, when the external force F acts in a direction perpendicular to the paper surface, it is divided into regions A and B and regions C and D with the straight line 15 as the center, and one vertical portion 5a, 6a, 7a, 8a and the other vertical portions 5b, 6b, 7b, 8b belonging to the regions C, D, and exhibit the same function as above.
[0010]
FIG. 5 shows an example of an undesirable structure. Of the four U-shaped anchor bolts 16 to 19, the vertical portions 16a and 16b and 18a and 18b of the two U-shaped anchor bolts 16 and 18 are virtual. arranged at four corners of the quadrilateral 20, the vertical portion 17a of the U-shaped anchor bolt 17 and 19, 17b, 19a, 19b is a straight line which divides in a virtual quadrilateral 20 in 4 regions to D, i.e. adjacent areas a The case where it arrange | positions to the boundary part of -D was shown. In the case of this structural example , according to the direction of the external force F, one of the U-shaped anchor bolts 17 or 19 on the side corresponding to the direction perpendicular to the direction of the external force F or the U-shaped anchor bolt 17 or 19 19 does not have an anchoring effect. Moreover, since the horizontal part c of all the U-shaped anchor bolts 16-19 concentrates on the center part and mutually overlaps, since the bulk becomes high, workability is not so good .
[0011]
FIG. 6 also shows an example of an undesired structure, which is the same as the embodiment of the present invention in that four U-shaped anchor bolts 21 to 24 are used, but one of the U-shaped anchor bolts is used. Are different in that the vertical portions 21b to 24b are located at the boundary portions of the diagonal regions. For this reason, when the external force F acts, the tensile force does not act on any of the U-shaped anchor bolts of the vertical portions 21b to 24b located in the front and rear central portions with respect to the direction of the external force F, and the anchor action. Will not play. For example, when focusing on the U-shaped anchor bolt 21, if the external force F is applied from above in the figure, the vertical portion 21b is located at the front and rear central portion with respect to the external force F, so that a tensile force is applied. Therefore, the anchor action is not achieved. That is, all the U-shaped anchor bolts 21 to 24 in this structural example have directionality regarding the anchor action at this point. As described above, the vicinity of the boundary portion of each region is not desirable as the arrangement portion of the vertical portion of the U-shaped anchor bolt, and is preferably as close to the corner of the virtual quadrilateral as far as possible from the boundary portion.
[0012]
It should be noted that the U-shaped anchor bolt used in the present invention is basically composed of two vertical portions connected via a horizontal portion, and the horizontal portion exerts a pulling resistance force as a fixing member. The shape is not limited to the specific shape. Moreover, as the material, an appropriate material such as a deformed reinforcing bar or a round steel can be used.
[0013]
【The invention's effect】
According to the present invention, since the vertical portions of the U-shaped anchor bolts are arranged in diagonal regions, one of the sides on which the external force acts is applied to the external force on any side of the virtual quadrilateral. Since the tensile force acts on the vertical part of the two and the tensile force does not act on the other vertical part, the entire horizontal part connecting the lower ends of the two vertical parts exhibits the pulling resistance as a fixing member. As a result, the fixing action is reliably increased. In this case, the other vertical portion on the side on which no tensile force is applied functions to suppress deformation of the horizontal portion, so that the fixing action by the horizontal portion is further reinforced. In addition, since four U-shaped anchor bolts are used and the horizontal portions thereof are arranged in a cross-beam shape, all the horizontal portions do not concentrate on the central portion and overlap each other. In addition to being obtained, the bulk is not so high and the workability is good. Furthermore, the depth of embedding as an anchor can be reduced by improving the fixing action as described above.
[Brief description of the drawings]
1 is a perspective view showing an actual施例of the present invention.
FIG. 2 is a longitudinal sectional view of the same embodiment.
FIG. 3 is an explanatory diagram relating to the arrangement of the embodiment.
FIG. 4 is an explanatory view showing an action state of each part by an external force of the embodiment .
FIG. 5 is an explanatory diagram showing an inappropriate example of arrangement .
FIG. 6 is an explanatory diagram showing an inappropriate example of arrangement .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Steel column, 2 ... Base plate, 3 ... Non-shrinkable mortar, 4 ... Foundation concrete, 5-8 ... U-shaped anchor bolt, 9 ... Screw part, 10, 11 ... Nut, 12 ... Square washer, 13 ... Virtual Quadrilateral, 14, 15 ... straight line, 16-19 ... U-shaped anchor bolt, 20 ... virtual quadrilateral, 21-24 ... U-shaped anchor bolt, AD ... area, a, b ... vertical part, c ... Horizontal

Claims (2)

With four U-shaped anchor bolt forming the threaded portion for steel column fixed at both ends, the steel columns fixed portion of each of the vertical portions pixels those of the anchor bolt of the U-shaped anchor bolt Based on a state in which the U-shaped anchor bolts are arranged in a cross-beam shape in a diagonal region divided by orthogonal straight lines connecting the midpoints of the opposite sides of the passing virtual quadrilateral. An anchor method for steel frames, which is embedded in concrete. Consists of four U-shaped anchor bolt forming the threaded portion for steel column fixed at both ends, the steel columns fixed portion of each of the vertical portions pixels those of the anchor bolt of the U-shaped anchor bolt Based on a state in which the U-shaped anchor bolts are arranged in a cross-beam shape in a diagonal region divided by orthogonal straight lines connecting the midpoints of the opposite sides of the passing virtual quadrilateral. A steel anchor device characterized by being embedded in concrete.

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