JP2592741Y2 - Base plate column fixing device - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, a positioning jig corresponding to a base plate is attached to an anchor bolt, the anchor bolt is buried in the foundation concrete as a column base, and after the positioning jig is removed, the position of the base plate is fixed. The present invention relates to a base plate column base fixing device.

[0002]

2. Description of the Related Art In general, when fixing an anchor bolt and a base plate, it is not necessary to completely fix the anchor bolt by filling it with mortar. When the diameter is 20 mm or more, it is larger than the high-strength bolt diameter by 1.5 mm. 1.5 mm clearance is allowed. However, regarding the clearance of the hole of the anchor bolt, generally, the clearance of the hole of the column base in the base plate is allowed to be about 5 mm.

As a conventional base plate column base fixing device according to this standard, a supporting washer having a cylindrical bolt hole having a flange slightly larger than a bolt hole of the base plate is fitted into a gap between the base plate and the anchor bolt. A flat washer having a counterbore for catching a flange from above by preventing the bearing washer from falling onto the base concrete by hooking the base washer on the upper surface of the base plate, and a base plate column base fixing device fixed by a tightening nut There is. This device is an improvement of the conventional mortar packing device between the base plate bolt holes and the anchor bolts, which eliminates the need for mortar and allows the clearance between the base plate bolt holes and the anchor bolts to be stipulated in the prescribed design criteria described above. It is possible to provide a base plate fixing device that falls within the range and has a predetermined clearance. However, this device has the disadvantage that it takes time to process the bearing washer having the flange, and that the flat washer to be put on the top must be counterbored, which is extremely uneconomical. .

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to simplify the processing of the bearing washer by eliminating the flange portion of the bearing washer, and to economically eliminate the need for machining of the counterbore of the flat washer. It is another object of the present invention to provide a base plate column base fixing device.

[0005]

The object of the present invention is to provide a base plate fixing device according to the first aspect of the present invention, that is, a telescopic spring is provided under a bearing washer. As a result, the bearing washer does not fall onto the foundation concrete, so that the flange of the bearing washer is not required, and the processing thereof is facilitated, and the counterbore of the flat washer is not required. The length of the spring is slightly longer than the distance between the upper surface of the foundation concrete and the lower surface of the base plate, the outer diameter is slightly smaller than the bolt hole, and the inner diameter is larger than the outer diameter of the anchor bolt. The bearing washer is a circle or length whose outer diameter is equal to the bolt hole in the base plate, whose length is equal to the thickness of the base plate, and whose inner diameter is large enough to allow for a tolerance correction to the shaft diameter of the anchor bolt. It has a circular cylindrical correction hole. This spring is first placed on the foundation concrete through the bolt holes in the base plate, and then the bearing washer is turned while it is in contact with the bolt holes in the base plate and the anchor bolts, and placed on the spring. This can be achieved by a base plate column base fixing device for fixing the position of the base plate by pressing down a spring and a bearing washer with a flat washer and a nut from above.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, a base plate column fixing device according to the present invention will be described with reference to the drawings. FIG. 1 is a view showing a state after tightening a nut of a base plate column fixing device according to the present invention, and FIG. FIG. 4 is a view showing a state before the nut is tightened. 1 and 2
When the spring 9 whose height is higher than the lower surface of the base plate 4 in FIG. 2 is pressed by the bearing washer 8 and the flat washer 5 in FIG. Since the bearing washer 8 is fixed at the same height and is sandwiched between the upper flat washer 5 and the lower spring 9, there is no need to provide a special flange.

[0007] The shape of the spring 9 is a state before the tightening of the nut shown in FIG. 2, that is, the length is slightly longer than the distance between the upper surface of the foundation concrete 1 and the lower surface of the base plate 4, and the outer diameter is the bolt hole 4 '. It is preferable that the inner diameter is slightly smaller than the outer diameter of the anchor bolt. The shape of the bearing washer 8 is such that the outer diameter is equal to the bolt hole of the base plate, the length is equal to the thickness of the base plate, and the inner diameter is such that the tolerance of the shaft diameter of the anchor bolt can be corrected. Circular or oval cylindrical correction hole 10
What is necessary is just to have. The size that allows the correction of the allowable range with respect to the shaft diameter of the anchor bolt is such that the clearance between the bolt hole of the base plate and the anchor bolt is within the allowable range defined in the above-described predetermined design standard, and the predetermined clearance is set. It means the size that can be corrected to have, and the hole through which the anchor bolt passes can be circular or oval, respectively, as shown in FIG. 3 a) and FIG. 3 b).
It was shown to. First, referring to FIG. 3A, the hole through which the anchor bolt passes, that is, the shape of the correction hole 10 is circular, and when the anchor bolt 2 is at the center of the bolt hole 4 ', the anchor bolt 2 is inserted into the bolt hole 4'. It is in a state of contacting the edge of the correction hole 10. If anchor bolt 2 is correct hole 1
If it does not come into contact with any part of the edge of 0, the bearing washer may be turned so as to come into contact with some part of the edge of the correction hole 10 in the bolt hole 4 '. 3B), the shape of the correction hole 10 is an oval having a predetermined straight line portion only on one side from a circle having a diameter equal to the shaft diameter of the anchor bolt 2, and the anchor bolt 2 abuts the correction hole 10. The state is shown. In this case, the contact area is naturally larger than that in the case where the correction hole 10 is circular. Further, as the material of the supporting washer 10, it is preferable to use SS400 having a compressive strength of 400 kg / cm ² or more or a hard plastic specified in JIS, for example, nylon 6 or polypropylene.

The overall procedure will be described. First, a positioning jig corresponding to the base plate 4, for example, an attachment plate, is attached, and four, six, or eight anchor bolts 2 are mounted on the foundation concrete 1. After embedding and removing the attachment plate, the base plate 4 having a bolt hole 4 'having a certain clearance with respect to the shaft diameter of the anchor bolt 1 is installed on the foundation concrete 1, and the spring 9 is bolted to the bolt hole 4'. And placed on the upper surface of the foundation concrete 1, and then the bearing washer 8 is put. In this way, the bearing washer 8 is fitted to the bolt 2 while turning it until it comes into contact with the bolt 2, and the spring 9 is pressed to fix the position. The spring 9 does not cause the bearing washer 8 to fall on the foundation concrete, so that the flange of the conventional bearing washer is not required. From above, hold it with a flat washer 5,
The base plate 4 is fixed by inserting the nut 6 and the locking nut 7. The gap between the foundation concrete 1 and the base plate 4 is filled with mortar as before.

[0009]

[Effect of the Invention] The base plate column base fixing device according to the present invention eliminates the flange portion of the conventional bearing washer, thereby facilitating the processing of the bearing washer and eliminating the necessity of machining the counterbore of the flat washer. It works.

[Brief description of the drawings]

FIG. 1 is a view showing a state after fastening a nut of a base plate column base fixing device according to the present invention;

FIG. 2 is a view showing the state before the nut is tightened of the base plate column fixing device according to the present invention;

FIG. 3a is a sectional view taken along the line AA of FIG. 1 showing a bearing washer having a circular correction hole. FIG. 3B is a sectional view taken along the line AA of FIG. 1 showing the bearing washer having an oval correction hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation concrete 2 Anchor bolt 3 Grout mortar 4 Base plate 4 'bolt hole 5 Flat washer 6 Nut 7 Locking nut 8 Bearing washer 9 Spring 10 Correction hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A base plate column base fixing device for mounting a positioning jig corresponding to a base plate on an anchor bolt, embedding the anchor bolt on the foundation concrete as a column base, removing the positioning jig, and fixing the position of the base plate. In the above, a base plate 4 having a bolt hole 4 ′ having a certain clearance with respect to the shaft diameter of the plurality of anchor bolts 2 is installed at intervals on the foundation concrete 1, and the length of the base plate 4 is equal to the length of the upper surface of the foundation concrete 1. A spring 9 whose length is slightly longer than the distance of the lower surface of the bolt 4, whose outer diameter is slightly smaller than the bolt hole 4 ′, and whose inner diameter is larger than the outer diameter of the anchor bolt 2 is placed on the upper surface of the foundation concrete 1 through the bolt hole 4 ′. The outer diameter is equal to the inner diameter of the bolt hole 4 ', the length is equal to the thickness of the base plate 4, and the inner diameter is Rotate the bearing washer 8 having a circular or oval cylindrical correction hole 10 sized to allow correction of the allowable range with respect to the shaft diameter of the anchor bolt 2 to a position where it comes into contact with the base plate 4 and the anchor bolt 2. The flat plate washer 5 and the nut 6 were placed on the spring 9 from above.
And a base plate column fixing device for fixing the position of the base plate 4 by pressing down the supporting washer 8.