JP3774762B2 - Anchor bolt installation structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anchor bolt used to fix a column base provided at the base of a steel column of a building on the foundation concrete, and in particular, the anchor bolt is positioned before the anchor bolt is embedded in the foundation concrete. It is related with the anchor bolt installation structure for installing.
[0002]
[Prior art]
An example of a conventional anchor bolt installation structure is shown in FIG. In the drawing, reference numeral 30 denotes an anchor bolt arranged in a vertical direction, and a nut 31 for fastening a column base metal provided later at the lower end of the steel column to the anchor bolt is provided at the upper end of the anchor bolt. .
[0003]
An intermediate portion excluding both ends of the anchor bolt 30 is inserted into a steel pipe member 34 so as not to contact the foundation concrete 35. An upper end portion of the pipe member 34 is fitted in a through hole of the first plate member 36 made of steel arranged in the horizontal direction. By welding this fitting portion, the first shape plate member 36 is positioned in the height direction, and at the same time, the anchor bolt upper end portion is positioned in the horizontal direction.
[0004]
The lower end 30b of the anchor bolt 30 is fitted into the fixing plate 32 (see FIG. 7) and the through hole of the second plate member 38 made of steel arranged in the horizontal direction, and tightened with the upper and lower nuts 39, 41. It is fixed by. Therefore, the second shape plate member 38 positions the lower end portion of the anchor bolt in the horizontal direction.
[0005]
As shown in FIG. 7, the second shape plate member 38 is formed in the shape of a mouth so as to position the lower ends 30b of the four anchor bolts 30. On the other hand, the first shape described above is used. The plate member 36 is also arranged in a mouth shape similar to the second shape plate member 38. In this way, the anchor bolt 30 and the first shape plate member 36 and the second shape plate member 38 are assembled with each other to form a unit, so that they are configured to be convenient for transportation and positioning.
[0006]
As shown in FIG. 7, two L-shaped angle members 40 are fixed to the lower side (back side of the drawing) of the second shape plate member 38 by welding, and the inside of the two L-shaped angle members 40. The upper ends of the two L-shaped angle members 42 are fixed by welding. As shown in FIG. 6, the L-shaped angle member 42 is arranged in the vertical direction, and the lower end portion thereof is fixed to the discarded concrete 44 by the fastening member 45 via the L-shaped angle member 46.
[0007]
In such a conventional anchor bolt installation structure, as shown in FIG. 6, the first shape plate member 36 fixed by welding in the middle of the height of the upper end portion of the pipe member 34 is embedded in the foundation concrete 35. The work of removing the first shape plate member 36 after the foundation concrete 35 is constructed is unnecessary, and therefore, the first shape plate member 36 need not be disposed of as industrial waste later.
[0008]
[Problems to be solved by the invention]
However, in such a conventional anchor bolt installation structure, the first shape plate member 36 must be fixed to the pipe member 34 by welding. The plate member 36 cannot be assembled with the anchor bolt 30 via the pipe member 34 to form a unit.
[0009]
Further, since the first shape plate member 36 performs horizontal positioning between the upper ends of the anchor bolts 30 via the pipe member 34, the first shape plate member 36 is located between the peripheral surface of the anchor bolt 30 and the inner peripheral surface of the pipe member 34. Due to the relatively large gap, there is a problem that it is difficult to perform accurate positioning between the upper ends of the anchor bolts 30.
[0010]
In view of the above problems, the present invention is capable of assembling a shape plate member with an anchor bolt to form a unit, and accurately positioning the anchor bolts in the horizontal direction, even if they are not skilled. An object of the present invention is to provide an anchor bolt installation structure that can be used.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the anchor bolt installation structure according to the present invention is:
A plurality of anchor bolts in which a male screw portion is formed at the upper end and an intermediate portion is inserted into the pipe member;
A plate member having a hole that fits directly into the upper end of the anchor bolt;
The pipe member is divided into a plurality of parts so as to include a first pipe member disposed below the shape plate member and a second pipe member disposed above.
The height of the second pipe member, in which a set configured lower than the height of the central mortar portion provided on the top end face of the foundation concrete.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 and FIG. 2 are views referred to for describing a first embodiment of an anchor bolt installation structure according to the present invention.
[0013]
In FIG. 1, reference numeral 30 denotes four anchor bolts arranged in the vertical direction. In order to fasten a column base metal provided later on the lower end of the steel column to the anchor bolt at the upper end portion of the anchor bolt 30. Nut 31 is provided.
[0014]
A fixing plate 32 is provided at the lower end portion of the anchor bolt 30, and a second plate member 38 made of steel arranged in the horizontal direction is arranged below the fixing plate 32. The through hole of the second plate member 38 is fitted to the lower end 30b of the anchor bolt 30 and is fastened and fixed together with the fixing plate 32 by the two upper and lower nuts 39 and 41. As a result, the second shape plate member 38 performs horizontal positioning between the lower end portions 30b of the anchor bolts 30.
[0015]
Around the anchor bolt 30, a first pipe member 34a, a second pipe member 34b, and a third pipe member 34c (rigid pipe member), which are steel pipe members, are fitted and arranged. That is, as shown in FIG. 2, a first shape plate member 37 is provided between the first pipe member 34 a and the second pipe member 34 b, and a hole 37 a formed in the first shape plate member 37. Are fitted into the anchor bolt 30 with a gap that is relatively smaller than the gap between the inner peripheral surface of the first pipe member 34a and the like and the peripheral surface of the anchor bolt 30, so that the upper end portions 30a of the anchor bolt 30 are connected to each other. Performs accurate positioning in the horizontal direction.
[0016]
Usually, a center mortar portion is further provided on the top end surface 35a of the foundation concrete 35 to support the column base metal, but the position of the upper end of the second pipe member 34b is set lower than the height of the center mortar portion, and the column base metal The bottom surface is not in contact with the upper end portion of the second pipe member 34b.
[0017]
As described above, the first pipe member 34a is provided on the lower side of the first shape plate member 37, and the second pipe member 34b is provided on the upper side of the first shape plate member 37. A third pipe member 34 c is provided between the nut 31 and the nut 31. Thus, before being embedded in the foundation concrete 35, the anchor bolt 30 is assembled with the first shape plate member 37, the second shape plate member 38, etc., and is unitized as an anchor bolt installation structure.
[0018]
A description will be given below along the construction procedure of the anchor bolt installation structure unitized in this way.
First, the anchor bolt installation structure is fixed on the abandoned concrete 44, and then when the foundation concrete 35 is placed, it is carried out in the state shown in FIG. Since the height is the same as or slightly lower than the top end surface 35a, the state is embedded in the foundation concrete 35.
[0019]
After the foundation concrete 35 is placed and dried and solidified, the nut 31 is then rotated and removed from the upper end 30a of the anchor bolt 30, and then the third pipe member 34c is lifted upward and removed. Only the upper end portion of the second pipe member 34b and the upper end portion 30a of the anchor bolt 30 protrude from the top end surface 35a of the foundation concrete 35, and the construction procedure of the anchor bolt installation structure is completed.
[0020]
Then, as in the prior art, a central mortar portion is formed at the center of the top end surface 35a of the foundation concrete 35, a column base metal is placed thereon, and the upper end of the anchor bolt 30 inserted through the mounting hole of the column base metal The nut 31 is screwed to the upper end of the portion 30a and tightened. Then, a non-shrink mortar is filled between the top end surface 35a of the foundation concrete 35 and the column base metal, and after drying for about three days, the nut 31 is further tightened, whereby the construction procedure of the column base metal attachment is completed.
[0021]
According to the anchor bolt installation structure having such a configuration, the anchor bolt installation structure in which the anchor bolt 30 and the first shape plate member 37 are assembled to form a unit is fixed on the discarded concrete 44, and then the foundation concrete 35 is attached. By placing, the first shape plate member 37 can be embedded and left inside the concrete. This eliminates the need to remove the first shape plate member 37 after construction, and eliminates the need to dispose the first shape plate member 37 as industrial waste later.
[0022]
Further, since the rigid pipe member is divided into the first pipe member 34a on the lower side of the first shape plate member 37 and the second pipe member 34b on the upper side, the hole 37a of the first shape plate member 37 is formed in the anchor bolt 30. Since it can be directly fitted, a gap between the peripheral surface of the hole 37a of the first shape plate member 37 and the peripheral surface of the anchor bolt 30 is formed between the inner peripheral surface of the first and second pipe members 34a and 34b and the anchor bolt 30. Therefore, the horizontal positioning between the upper ends of the anchor bolts 30 can be accurately performed.
[0023]
Further, according to the anchor bolt installation structure configured as described above, since it is not necessary to perform welding as in the prior art, the first type plate member 37 can be assembled with the anchor bolt 30 and the anchor bolt even if not skilled. It can be unitized as an installation structure.
[0024]
Also, as shown in FIG. 1, there is a third pipe member 34c that fits into the upper end 30a of the anchor bolt 30 between the nut 31 and the second pipe member 34b. There is no need to wrap the tape to prevent water from entering or to protect the thread. Moreover, since the 3rd pipe member 34c can be recycled at the time of the next construction, the effort which disposes as industrial waste after construction can be saved.
[0025]
In the first embodiment, steel pipe members are used for the first pipe member 34a, the second pipe member 34b, and the third pipe member 34c. The rigid pipe member such as metal or plastic may be made of any material.
[0027]
FIG. 3 to FIG. 5 are diagrams referred to for explaining the second embodiment of the present invention. In the second embodiment, an unbonded sleeve 47 (pipe member) made of cardboard is fitted around the anchor bolt 30, and the upper end 30 a of the anchor bolt 30 is connected to the upper end 30 a of the anchor bolt 30. 4 is provided, and the first plate member 37 is attached via the fixture 50. As shown in FIG.
[0028]
That is, as shown in FIG. 4, a female screw 50 a is formed on the inner periphery of the upper end portion of the fixture 50, and this female screw 50 a is a male screw of the upper end portion 30 a of the anchor bolt 30 as shown in FIG. 3. It is designed to be screwed to the lower end.
[0029]
As shown in FIG. 4, a male screw 50b is formed on the outer periphery on the lower end side of the fixture 50. As shown in FIG. 3, a nut 52 constituting a part of the fixture 50 is screwed to the male screw 50b. It is supposed to be combined.
[0030]
By fitting the fixture 50 into the hole 37a of the first profile plate member 37 and sandwiching the first profile plate member 37 between the flange portion 50c formed at the lower end of the fixture 50 and the nut 52, the first profile plate member 37 can be positioned in the height direction.
[0031]
As shown in FIG. 4, between the female screw 50a side and the male screw 50b side of the fixture 50, a broken portion 50d having a concave wedge-shaped cross section is formed, and the female screw 50a side and the male screw 50b side are formed. Are rotated relative to each other, and by applying a force that pulls them apart, the fixture 50 can be broken and separated at the broken portion 50d.
[0032]
According to the second embodiment, after the foundation concrete 35 is placed and solidified, the fixture 50 is broken and separated at the breaking portion 50d, and the state shown in FIG. 5 is obtained. finish.
[0033]
According to the second embodiment of the present invention as described above, the horizontal positioning between the upper end portions 30a of the anchor bolts 30 can be accurately performed, as in the first embodiment. Thus, it is not necessary to perform welding, so that the first shape plate member 37 can be assembled with the anchor bolt 30 to form a unit as an anchor bolt installation structure even if the person is not skilled.
[0034]
FIG. 8 is a diagram which is referred to for explaining the third embodiment of the present invention. In the first embodiment, three first, second, and third pipe members 34a, 34b, and 34c are used. In the third embodiment, two first and first pipe members 34a, 34b, and 34c are used. The difference is that two pipe members 34a and 34b are used.
[0035]
In the first embodiment, since the height of the upper surface of the first plate member 37 is lower than the top end surface 35a of the foundation concrete 35, the lower half of the second pipe member 34b is the foundation concrete 35. In order to remove the third pipe member 34c later, the third pipe member 34c was separated from the second pipe member 34b to form three pipe members. In the embodiment, since the upper surface of the first shape plate member 37 is the same height as the top end surface 35a of the foundation concrete 35, the second pipe member 34b can be removed later without being buried in the foundation concrete 35. Therefore, it is only necessary to use two pipe members 34a and 34b.
[0036]
In the above embodiment, the case where there are four anchor bolts 30 has been described, but it is needless to say that it is not necessary to limit the number of anchor bolts 30 to four.
[0037]
Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and various other modifications can be made based on the technical idea of the present invention. It is possible.
[0038]
【The invention's effect】
As described above, according to the anchor bolt installation structure of the present invention, it is possible to accurately position the anchor bolts in the horizontal direction, and it is not necessary to perform welding as in the prior art, so that there is skill. Even if it is not a person, a shape plate member can be assembled with an anchor bolt and unitized.
[Brief description of the drawings]
FIG. 1 is a partially sectional front view showing an anchor bolt installation structure according to a first embodiment of the present invention.
2 is an enlarged cross-sectional view of a main part of the anchor bolt installation structure of FIG.
FIG. 3 is an enlarged cross-sectional view of an essential part of a second embodiment of the present invention.
4 is an enlarged cross-sectional view of the fixture 50. FIG.
5 is an enlarged cross-sectional view showing a process of using the fixture 50. FIG.
FIG. 6 is a front view showing a conventional anchor bolt installation structure.
7 is a cross-sectional view taken along the line AA of the anchor bolt installation structure in FIG. 6;
FIG. 8 is an enlarged cross-sectional view of a main part of an anchor bolt installation structure according to a third embodiment of the present invention.
[Explanation of symbols]
30 anchor bolt 30a upper end 30b lower end 31 nut 32 fixing plate 34 pipe member 34a first pipe member 34b second pipe member 34c third pipe member 35 foundation concrete 35a top end face 36, 37 first shape plate member 37a hole 38 first Two-shaped plate member 39 Nut 40 L-shaped angle member 41 Nut 42 L-shaped angle member 44 Discarded concrete 45 Fastening member 46 L-shaped angle member 47 Unbond sleeve 50 Mounting tool 50a Female screw 50b Male screw 50c Flange portion 50d Breaking portion 52 Nut

Claims (1)

A plurality of anchor bolts in which a male screw portion is formed at the upper end and an intermediate portion is inserted into the pipe member;
A plate member having a hole that fits directly into the upper end of the anchor bolt;
The pipe member is divided into a plurality of parts so as to include a first pipe member disposed below the shape plate member and a second pipe member disposed above.
The height of the second pipe member, the anchor bolt installation structure characterized in that it is set lower than the height of the central mortar portion provided on the top end face of the foundation concrete.

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