JP2000352120A - Positioning plate for anchor bolt for exposed column base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit smooth insertion of anchor bolts which have screw portions being irregular in direction and position, to thereby achieve correct positioning, by forming a plurality of bolt holes each of which has a bolt guiding slant surface on a bolt entering side, at a concentric location with each bolt hole formed in a base plate of an exposed pillar base of a steel structure. SOLUTION: A positioning plate 1 of an anchor bolt for an exposed pillar base has bolt holes 7 formed therein at a concentric location with each bolt hole formed in a base plate 1. The number of the bolt holes 7 is the same as that of the bolt holes in the base plate 1. Each bolt hole 7 has a bolt guiding slant surface 8 on a bolt entering side, and the bore thereof is almost the same as an external diameter of an upper screw portion 2a of the anchor bolt 2. Therefore, when the positioning plate 1 is pressed down at a dash while keeping its horizontal state, if the direction and/or position of the upper screw portion 2a of the anchor bolt 2 is slightly irregular, insofar as each upper screw portion 2a is positioned within the range of the slant surface 8, the upper screw portion 2a of each anchor bolt 2 is smoothly guided to pass through the bolt hole 7, due to the guiding function of the slant surface 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning method of an anchor bolt used for fixing an upper end of each anchor bolt supported by a holder to a bolt hole provided in a base plate in an exposed steel column base. About the plate.

[0002]

2. Description of the Related Art In an exposed steel column base as shown in FIG. 12, an upper end of each of the anchor bolts 2 supported by a holder 4 and standing vertically upward is provided with a bolt provided on a base plate A of the exposed steel column base. It is important to match and fix the hole B. Therefore, when placing the foundation concrete 6,
It is necessary to precisely position and fix the upper end screw portion 2a of the anchor bolt 2 so as not to shift.

Conventionally, a positioning plate provided with a necessary number of bolt holes is attached to the upper end of each anchor bolt supported by a holder at a position concentric with a bolt hole provided in a base plate. . For example,

[0004] An anchor bolt fixing device described in Japanese Patent Publication No. 3-35455, as illustrated in FIG. 8, is provided at a concentric position of a bolt hole provided in a base plate.
The configuration is such that the upper end thread portion of each anchor bolt is aligned with the bolt hole provided in the base plate and fixed by the positioning plate 12 provided with the bolt hole 13.

[0005] However, the positioning plate 12 of FIG.
When the inner diameter of the bolt hole 13 is substantially the same as the outer diameter of the screw of the upper screw portion of the anchor bolt, when simultaneously passing the upper screw portions of a plurality of anchor bolts of different orientations and positions into the bolt hole 13, the same plate 12 is used. Is thin and the rim of each bolt hole is caught by a screw thread, so it is difficult to pass through and work is troublesome.

After the foundation concrete has solidified,
When removing the unnecessary positioning plate 12 from the upper end screw portion of the anchor bolt, the edge of each bolt hole 13 is caught by the screw thread and cannot be easily removed. If it is forcibly pulled out, the thin positioning plate 12 may be easily deformed and may not be diverted thereafter.

On the other hand, if the diameter of the bolt hole 13 is set to a sufficient size as illustrated in FIG. A gap is formed between them, and the positioning function of the function originally required for the positioning plate 12 is reduced, so that each of the anchor bolts 2 cannot be accurately set to the concentric position, and a positional error (deviation) is likely to occur.

Conventionally, means for solving the above-mentioned disadvantages have been studied. For example,

[0009] An anchor bolt fixing form plate (positioning plate) described in Japanese Utility Model Publication No. 7-47526.
As shown in FIG. 10, a large-sized washer 15 is fixed only to the position of the bolt hole 13 of the positioning plate 14, so that the effective length of the bolt hole 13 is reduced by the screw pitch P of the upper end screw portion of the anchor bolt. (See FIG. 9). Therefore, when passing or pulling out the upper end screw portion of the anchor bolt, it is possible to work smoothly without causing a problem that the edge of the bolt hole 13 is caught by the screw thread.

In the anchor bolt fixing device described in Japanese Patent Application Laid-Open No. 8-49306, as shown in FIG. 11, a notch portion 17 is provided in a peripheral portion of a positioning plate 16 in a series of cutouts from respective bolt holes 13. The upper end thread portion of the anchor bolt is configured to be inserted from the lateral direction.

[0011]

The positioning plate 14 of the prior art described above secures the effective length of the bolt hole 12 with a thick washer 15.
The bolts must be drilled by fixing the washer 15 to the holes, which increases the number of working steps and increases the cost.

The above-described prior art positioning plate 16
Requires that the bolt holes 13 and the notches 17 be formed in series, and since the anchor bolts are in an immobile state after the foundation concrete has solidified, the positioning plate 16 must be pulled straight up. 8 remains the same problem.

[0013] It is an object of the present invention to be able to smoothly pass through the upper end thread portions of a plurality of anchor bolts having irregular directions and positions, and to expect an accurate positioning action at a concentric position. An object of the present invention is to provide a positioning plate that can be smoothly operated without being caught and is suitable for diversion because it is not deformed, and does not increase the number of manufacturing steps.

[0014]

According to another aspect of the present invention, a positioning plate for an exposed column base anchor bolt according to the first aspect of the present invention includes a bolt hole provided in a base plate of a steel frame exposed column base. In the positioning plate for aligning and fixing the upper ends of the vertically upwardly anchored bolts supported by the holder, a bolt guiding slope is provided on the bolt inlet side at a position concentric with the bolt hole provided in the base plate. A required number of bolt holes are provided.

According to a second aspect of the invention, in the positioning plate of the exposed column base anchor bolt according to the first aspect, a return portion is provided on a bolt outlet side of the bolt hole.

According to a third aspect of the present invention, in the positioning plate of the exposed column base anchor bolt according to the first aspect, a vertical portion having substantially the same diameter as the bolt outer diameter is provided subsequent to the inclined surface portion forming the bolt hole, A return portion is provided at the upper end of the vertical portion.

According to a fourth aspect of the present invention, in the positioning plate of the exposed column base anchor bolt according to the third aspect, the vertical portion has a height of at least one pitch of a screw pitch of an upper end thread portion of the anchor bolt. It is characterized by the following.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A positioning plate for an exposed column base anchor bolt according to the first to fourth aspects of the present invention has a bolt hole provided in a base plate of a steel frame exposed column base, and is vertically supported by a holder. It is preferably implemented to match and fix the upper ends of the upright anchor bolts. FIG. 1 et seq. Show an embodiment in which anchor bolts 2 which are supported by nuts 3c and 3d on fixing plates 5 of a holder 4 in the shape of a hollow box and which stand vertically upward are shown as an example.

The positioning plate 1 is provided at a position concentric with a bolt hole B provided in a base plate A shown in FIG.
The same number of bolt holes 7 are provided. Each bolt hole 7
As shown in detail in FIG. 2, a bolt guide inclined surface 8 is provided on the bolt inlet side.

The inclined surface portion 8 can be formed simply and with high precision simultaneously with the drilling of the bolt holes 7 by a known burring method. The diameter of the bolt hole 7 is the anchor bolt 2
Is approximately equal to the outer diameter of the upper end screw portion 2a.

Therefore, if the positioning plate 1 is used, as shown in FIG. 2, even if the direction and position of the upper end screw portion 2a of the anchor bolt 2 are slightly disturbed, each upper end screw portion 2a is inclined. As long as the positioning plate 1 is kept in the horizontal state and pushed down at a stretch,
The upper end thread 2a of each anchor bolt 2 is smoothly guided to the bolt hole 7 by the guiding action of the inclined surface portion 8 (the invention according to claim 1).

As a procedure for passing the positioning plate 1 through the upper end screw portion 2a of the anchor bolt 2 and fixing it, the lower nut 3b is screwed into the upper end screw portion 2a of each anchor bolt 2 at a predetermined position in advance.

Thereafter, adjustment is performed so that the upper end screw portion 2a of the anchor bolt 2 is located within the range of each inclined surface portion 8 of each bolt hole 7 of the positioning plate 1, and the positioning plate 1 is pushed down with both hands in a horizontal state.

The positioning plate 1 is provided with the lower nut 3
At the stage where the upper nut 3a is equally hit, the upper nut 3a is screwed and fixed. Thus, the upper end screw portion 2a of each anchor bolt 2 can be accurately positioned and fixed at the concentric position. Then, the foundation concrete 6 is cast as shown in FIG. At the stage where the basic concrete 6 has been cured and has developed its strength, the upper nut 3a is removed, the positioning plate 1 is removed, and the lower nut 3b is removed as shown in FIG.

The formation of the bolt hole 7 having the inclined surface portion 8 as shown in FIG. 2 is not limited to the burring process, but is performed by forming two cut lines 11 in an orthogonal direction as shown in FIG.
It can also be implemented by a knockout method in which each section is protruded from one side.

Considering the work of removing the used positioning plate 1 from the anchor bolts 2 after curing of the foundation concrete 6, as shown in FIG. 6, a return portion is provided at the upper end of the inclined surface 8 of each bolt hole 7. 9 is effective. The return portion 9 rounds the rim of the bolt hole 7, so that the removal operation can be performed smoothly without being caught on the thread of the upper end thread portion 2 a of the anchor bolt 2 (the invention according to claim 2).

Further, as shown in FIG. 7, when a vertical portion 10 having a diameter substantially equal to the outer diameter of the upper end screw portion 2a is provided following the inclined surface portion 8 of the bolt hole 7, the vertical portion 10 The accuracy of fixing the upper end screw portion 2a at the concentric position can be further enhanced (the invention according to claim 3).

The height of the vertical portion 10 is at least one pitch of the screw pitch of the upper end screw portion 2a of the anchor bolt 2 in order to enhance the sliding effect of the upper end screw portion 2a (the invention according to claim 4).

[0029]

According to the positioning plate of the exposed column base anchor bolt according to the invention as set forth in claims 1 to 4, each of the bolt holes is provided with the inclined surface portion, the return portion, and the vertical portion. Not only can the upper diameter thread of each anchor bolt be precisely fixed in a concentric position by forming the diameter approximately equal to the outer diameter of the upper thread part, but also it is easy to remove it after it is no longer needed and no deformation occurs. It can be diverted to the same kind of work later, and is economical.

Needless to say, a sufficiently thin positioning plate can be used, the number of man-hours required for manufacturing the positioning plate can be reduced, the cost can be reduced, and the working efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an elevation view when a positioning plate of an exposed column base anchor bolt according to the present invention is used.

FIG. 2 is an enlarged view of a bolt hole portion of the positioning plate of the present invention.

FIG. 3 is an elevational view of a state where foundation concrete has been cast using a positioning plate.

FIG. 4 is an elevational view with the positioning plate removed.

FIG. 5 is a plan view of an embodiment showing a positioning plate in which a slit is formed in a flat plate as a bolt hole.

FIG. 6 is a cross-sectional view showing only a bolt hole portion of a different embodiment of the positioning plate.

FIG. 7 is a cross-sectional view showing only a bolt hole portion of a different embodiment of the positioning plate.

FIG. 8 is a plan view showing a conventional positioning plate.

FIG. 9 is an enlarged view of a bolt hole in FIG. 8;

FIG. 10 is a plan view of another conventional positioning plate.

FIG. 11 is a plan view of another conventional positioning plate.

FIG. 12 is an elevation view of an exposed steel column base.

[Explanation of symbols]

 Reference Signs List A Base plate B Bolt hole in base plate 1 Positioning plate 2 Anchor bolt 2a Upper end of anchor bolt (upper thread) 4 Anchor bolt holder 7 Bolt hole 8 Inclined surface 9 Return part 10 Vertical part

Claims (4)

[Claims] 1. A positioning plate for aligning and fixing an upper end of a bolt hole provided in a base plate of an exposed steel column base and an anchor bolt supported by a holder and standing vertically upward, wherein a bolt provided in the base plate is provided. A positioning plate for an exposed column base anchor bolt, characterized in that a required number of bolt holes having an inclined surface portion for guiding a bolt are provided on the bolt inlet side at a position concentric with the holes. 2. The positioning plate for an exposed column base anchor bolt according to claim 1, wherein a return portion is provided on the bolt outlet side of the bolt hole. 3. The method according to claim 1, wherein a vertical portion having substantially the same diameter as the bolt outer diameter is provided following the inclined surface portion forming the bolt hole, and a return portion is provided at an upper end of the vertical portion. Positioning plate for the exposed column base anchor bolt described. 4. The positioning plate for an exposed column base anchor bolt according to claim 3, wherein the vertical portion has a height of at least one pitch of a screw pitch of an upper end thread portion of the anchor bolt.