JP2004244954A - Anchor bolt installing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor bolt installing method for reducing time required for this work by simplifying the installing and centering work of anchor bolts by reducing influence of a state of a leveling concrete surface and a structure existing around a position for installing the anchor bolts. <P>SOLUTION: An anchor bolt installing stand 50 having receiving members 56 and 58 is horizontally placed on leveling concrete 6 so as to be adjustable in the prescribed height. A template member 32 for positioning the mutual horizontal directions is placed on the receiving members 56 and 58 by connecting mutual upper end parts of a plurality of anchor bolts 2. The anchor bolts are centered in the horizontal direction by moving the template member in the horizontal direction. A fixing stand 4 is installed between the plurality of anchor bolts and the leveling concrete. The anchor bolt installing stand is disassembled and removed from above the leveling concrete before arranging reinforcements around the anchor bolts. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anchor bolt used to fix a column base metal provided at the base of a steel column of a building on foundation concrete, and more particularly to an anchor bolt installed so as to position and fix an anchor bolt before being buried in foundation concrete. The present invention relates to a method of installing an anchor bolt for performing the operation.
[0002]
[Prior art]
Anchor bolts for fixing column base hardware provided at the base of the steel column of the building on the foundation concrete must be positioned in the horizontal and height directions before being buried in the foundation concrete. There is.
[0003]
For this reason, the lower end of the vertical pile, which is a component member, is discarded and concrete is used and the anchor bolts are accurately positioned on the base using an assemblable anchor bolt installation base that is driven into the ground below. Conventionally, there has been a method in which a reinforcing bar is arranged around an anchor bolt while being held, and a foundation concrete is cast (for example, see Patent Document 1).
[0004]
However, in such an anchor bolt installation method, it is necessary to perform the rebar arrangement work in a state where the anchor bolt installation base is present. Therefore, there is a problem that the work efficiency of the arrangement of the bars is significantly reduced.
[0005]
In addition, since some members of the anchor bolt installation stand are buried in the foundation concrete together with the anchor bolts and reinforcing bars, the upper ends of the parts protrude above the foundation concrete and remain as obstacles. There was the problem that it had to be removed later.
[0006]
Therefore, in order to make the arrangement work more efficient and to prevent the obstacles from remaining on the foundation concrete later, after fixing the anchor bolts on the concrete by discarding them only through the fixing stand, Conventionally, there has been a structure in which an unnecessary object such as a mounting stand for anchor bolts is not left around the periphery (for example, see Patent Document 2).
[0007]
As an example of such an anchor bolt installation structure, there is an anchor bolt installation structure as shown in FIG. This anchor bolt installation structure has substantially the same structure as the anchor bolt installation structure described in Japanese Patent Application No. 2002-076278. In this anchor bolt installation structure, four anchor bolts 2 are fixed on abandoned concrete 6 via a fixing base 4 connected to the lower end thereof.
[0008]
The fixing base 4 includes a frame-shaped portion 8, a standing angle 10, and a U-shaped support 12. The frame-shaped portion 8 is formed by welding L-shaped angle members arranged in a rectangular frame shape to each other at the corners of the rectangular frame. The standing angle 10 is an L-shaped angle member having a predetermined length arranged in the vertical direction, and has a lower end portion welded to each corner of the frame-shaped portion 8.
[0009]
As shown in FIGS. 9 and 10, the upper end of the short L-shaped angle member 16 is welded to the lower side of the U-shaped bracket 14. Is formed with a through hole 17 into which the anchor bolt 2 is fitted.
[0010]
Then, as shown in FIG. 8, the standing angle 10 and the L-shaped angle member 16 of the U-shaped support 12 are placed at positions corresponding to each other in a state where the respective L-shaped cross sections are overlapped in the same direction. The provided through holes are fastened by bolts 18 and nuts 19.
[0011]
Such a fixing base 4 often carries each of the constituent members 8, 10, 12, 16 and the like to the site and assembles them at a position where the anchor bolt 2 is installed.
[0012]
In addition, a nut 20 and a washer 24 for fastening the column base metal provided at the lower end of the steel column of the building to the anchor bolt 2 are provided at the upper end of the four anchor bolts 2.
[0013]
The anchor bolt 2 has a cylindrical large sleeve 26 and a small sleeve 26 arranged in order from the bottom so that most of the length except the lower end does not directly contact the foundation concrete to be cast later. The sleeve 28 and the middle sleeve 30 are inserted into shaft holes.
[0014]
Further, the four anchor bolts 2 are integrally connected by a shape plate member 32, and are positioned relative to each other. As shown in FIG. 11 and FIG. 12, the shaped plate member 32 has short steel plates 34 bent so that the cross section in the width direction is substantially L-shaped, and overlaps at the bottom surfaces at both ends thereof. These are welded to each other so as to be arranged in a square frame shape. Through holes 36 for fitting the anchor bolts 2 are formed at four corners of the shape plate member 32.
[0015]
Then, each of the four anchor bolts 2 penetrates through the through holes 36 at the four corners of the shaped plate member 32 and, as shown in FIG. 8, the nuts 20, 38, 42 at both ends of each anchor bolt 2. The upper and lower ends of the large sleeve 26 and the small sleeve 28 face each other so as to sandwich the plate material on the bottom surface side of the steel plate 34 of the shaped plate member 32 in the thickness direction.
[0016]
The lower end of the anchor bolt 2 is fitted into the washer-type fixing plate 40 and the through hole 17 of the U-shaped support 12 (see FIG. 10). It is fixed by being sandwiched between and tightened.
[0017]
Conventionally, when such an anchor bolt installation structure is used, the fixing base 4 is assembled sequentially from the lower frame-shaped portion 8 upward. First, the U-shaped support 12 and the standing angle 10 are fixed by bolts 18 and nuts 19, and then the standing angle 10 is moved up and down to adjust the position of the U-shaped support 12 to an appropriate height. Then, the standing angle 10 is fixed to the frame-shaped portion 8 by welding.
[0018]
Then, after assembling the anchor bolt 2 and the shaping plate member 32 and the like, the frame-shaped portion 8 is moved on the discarded concrete 6 to center the anchor bolt 2 in the horizontal direction. The frame-shaped portion 8 of the fixing base 4 is discarded and fixed to the concrete 6 by the anchor bolts 44.
[0019]
[Patent Document 1]
Japanese Patent Publication No. 7-18253 [Patent Document 2]
JP 2002-348880 A
[Problems to be solved by the invention]
However, in such a method, when the horizontal position of the frame-shaped portion 8 is adjusted, it is affected by unevenness and inclination of the surface of the discarded concrete 6, so that the work of centering the anchor bolt 2 and adjusting the height is performed. However, there is a problem that a large amount of time is often spent on the computer.
[0021]
In addition, in the case where a part of a structure such as a pile or a reinforcing bar is already arranged around the position where the anchor bolt 2 is installed, these may be obstacles to the installation work of the anchor bolt 2. As a result, there is a problem that the work efficiency of centering the anchor bolt 2 and adjusting the height is further reduced.
[0022]
Therefore, the present invention can reduce the influence of the condition of the surface of the discarded concrete and the structure around the position where the anchor bolt is installed, and can simplify the installation and centering work of the anchor bolt, as well as this work. It is an object of the present invention to provide an anchor bolt installation method that can reduce the time required for the installation.
[0023]
[Means for Solving the Problems]
In order to solve the above problems, the present invention
An anchor bolt installation method using a structure in which a plurality of anchor bolts are positioned and fixed on concrete discarded through a fixing base and fixed,
Place the anchor bolt installation base having a receiving member so that it can be adjusted horizontally and at a predetermined height on the discarded concrete,
A shape plate member that connects upper end portions of the plurality of anchor bolts and positions the horizontal direction between them is placed on the receiving member,
Perform horizontal alignment of the anchor bolt by moving the shape plate member in the horizontal direction,
Assembling the fixing base between the plurality of anchor bolts and the waste concrete,
Before arranging the reinforcing bolt around the anchor bolt, the anchor bolt installation base is disassembled and removed from the discarded concrete.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an anchor bolt installation method according to the present invention will be specifically described with reference to the drawings.
[0025]
1 to 7 are views referred to for describing an embodiment of an anchor bolt installation method according to the present invention. Incidentally, the constituent members such as the anchor bolt 2, the shape plate member 32, and the fixing base 4 shown in these figures are the same as the latter of the conventional example (shown in FIGS. 8 to 12). The description of the configuration that is the same as that of the conventional example will be omitted.
[0026]
In the anchor bolt installation method according to the present invention, the anchor bolt installation base 50 shown in FIGS. 1 to 3 is used. As shown in FIG. 1, the anchor bolt installation base 50 includes a pair of legs 52, 54 and two receiving members 56, 58 supported by the pair of legs 52, 54.
[0027]
As shown in FIG. 2, one of the legs 52 is an L-shaped angle member and a pair of standing angles 60 a and 60 b arranged in a vertical direction so as to be parallel to each other, and each of the standing angles 60 a and 60 b. And an L-shaped angle member 62 and an L-shaped angle member 64 which are arranged in the horizontal direction so as to connect the lower end portion and the height center portion. These are welded and assembled integrally, and the other leg 54 has the same structure.
[0028]
In the description of the present embodiment, as shown in FIG. 3, two standing angles on one leg 52 are represented by reference numerals 60a and 60b, and two standing angles on the other leg 54 are represented by reference numerals. These are represented by 60c and 60d.
[0029]
The receiving members 56 and 58 are obtained by cutting an L-shaped angle member to a predetermined length, and the two receiving members 56 and 58 are arranged so as to be parallel to each other. Both ends of the receiving member 56 are fixed to a standing angle 60a of the one leg 52 and a standing angle 60c of the other leg 54 by a fixture such as a vise (not shown) to adjust the height. You can do it.
[0030]
Similarly, both ends of the receiving member 58 are fixed to the standing angle 60b of the one leg 52 and the standing angle 60d of the other leg 54 by a fixing tool such as a vise, so that the height of the receiving member 58 can be adjusted. You can do it.
[0031]
Since the anchor bolt installation base 50 has such a structure, the legs 52, 54 and the receiving members 56, 58 can be assembled at the installation position of the anchor bolt 2. Also, as will be described later, after the installation work of the anchor bolts 2 is completed, the anchor bolt installation base 50 can be disassembled.
[0032]
Next, the procedure of the anchor bolt installation method according to the present invention will be described.
First, an anchor bolt installation base 50 as shown in FIGS. 1 to 3 is assembled at a position where the anchor bolt 2 is installed on the discarded concrete 6.
[0033]
Then, the receiving members 56 and 58 are adjusted to have a predetermined height and to be horizontal. Even when the standing angles 60a, 60b, 60c, and 60d of the legs 52 and 54 do not maintain vertical due to the unevenness and inclination of the surface of the discarded concrete 6, the receiving members 56 and 58 have both ends. Since the standing angles 60a and 60b and the standing angles 60c and 60d can be independently fixed by fixing devices such as vise, the receiving members 56 and 58 are not affected by the surface of the discarded concrete 6. It can be adjusted to be horizontal at a predetermined height.
[0034]
Next, as shown in FIGS. 4 and 5, the anchor bolt 2, the nut 20, the washer 24, the large sleeve 26, the small sleeve 28, the middle sleeve 30, the plate member 32, the fixing plate 40, the nuts 38, 42, and After assembling the U-shaped support 12 into a unit, the lower surface of the shape plate member 32 is placed on the upper surface of the receiving members 56 and 58 so as to be in contact therewith.
[0035]
Since the receiving members 56 and 58 have already been adjusted horizontally at a predetermined height, the anchor bolts 2 need only be placed on the receiving members 56 and 58, as shown in FIG. It is arranged in a state of hanging vertically at a predetermined height.
[0036]
Next, the upper end of the standing angle 10 is fixed to the L-shaped angle member 16 of the U-shaped support 12 (see FIG. 6). The standing angle 10 and the L-shaped angle member 16 of the U-shaped support 12 can be fixed by welding, but may be fixed with bolts and nuts as in the conventional case.
[0037]
Next, while the shape plate member 32 is placed on the receiving members 56 and 58, the horizontal position adjustment (centering) of the anchor bolt 2 is performed. As shown in FIG. 7, the shape plate member 32 can be moved in the length direction of the receiving members 56 and 58, and also in the direction perpendicular to the length direction of the receiving members 56 and 58, It can move within the range of the space between the large sleeve 26 and the range of the space between the receiving member 58 and the large sleeve 26.
[0038]
Next, as shown in FIG. 6, the frame-shaped part 8 is fixed to the lower end of the standing angle 10 by welding, and the fixing base 4 is completed. In this operation, unlike the conventional anchor bolt installation method, since the anchor bolt 2 is already set at a predetermined height, there is no need to adjust the height before welding. Then, the frame-shaped portion 8 is fixed to the discarded concrete 6 with the small anchor bolts 44, and the installation of the anchor bolts 2 is completed. Thereafter, the anchor bolt installation base 50 is disassembled and discarded and removed from the concrete 6.
[0039]
As described above, the embodiment of the anchor bolt installation method according to the present invention has been specifically described. However, the present invention is not limited to the anchor bolt installation structure of the structure used in the present embodiment, and a similar technology. Based on the concept, if the receiving member can adjust the height and the horizontal, and can move and adjust the mounted plate member horizontally, other structures of the receiving member can be used. Needless to say, the present invention can be applied to an anchor bolt installation structure.
[0040]
In addition, the receiving member of the anchor bolt installation stand is not limited to two as in the present embodiment, and may be constituted by a single member having a large width on a horizontal plane, for example. It goes without saying that a member having a different shape may be used.
[0041]
【The invention's effect】
As described above, according to the anchor bolt installation method of the present invention, since the influence of unevenness and inclination of the surface of the discarded concrete can be reduced, the work of horizontal centering and height adjustment of the anchor bolt can be simplified. And the time required for this operation can be significantly reduced.
[0042]
In addition, even when a part of a structure such as a pile or a reinforcing bar is already placed around the anchor bolt installation position, the structure is not so affected by such a structure. As a result, the work of centering and adjusting the height of the anchor bolt in the horizontal direction can be simplified, and the time required for this work can be greatly reduced.
[0043]
After the anchor bolt is installed by the anchor bolt installation method according to the present invention, the anchor bolt installation base is disassembled and discarded and removed from the concrete, and the anchor bolt installation base is assembled at another place and the anchor bolt installation base is assembled. Therefore, it is possible to efficiently perform not only the anchor bolt installation but also the subsequent bar arrangement work.
[Brief description of the drawings]
FIG. 1 is a front view showing an anchor bolt installation base 50 according to an embodiment of the present invention.
FIG. 2 is a right side view of the anchor bolt installation base 50 in FIG.
FIG. 3 is a plan view of an anchor bolt installation base 50 in FIG. 1;
FIG. 4 is a front view showing a state where the shape plate member 32 is placed on the receiving members 56 and 58 of the anchor bolt installation base 50 in FIG. 1 and the anchor bolts are arranged.
FIG. 5 is a plan view of the anchor bolt installation base 50 and the shape plate member 32 in FIG.
FIG. 6 is a front view showing a state where a fixing base 4 is assembled between the anchor bolt 2 and the waste concrete 6;
FIG. 7 is a view of an anchor bolt installation gantry 50 as viewed in the direction of arrows AA, showing the position of the shape plate member 32 in FIG. 6;
FIG. 8 is a front view showing a conventional anchor bolt installation structure.
FIG. 9 is a side view showing the U-shaped support 12 in FIG.
FIG. 10 is a plan view showing a U-shaped support 12 in FIG. 9;
FIG. 11 is a plan view showing the shape plate member 32 in FIG.
FIG. 12 is a side view showing the shape plate member 32 in FIG.
[Explanation of symbols]
2 Anchor bolt 4 Fixing stand 6 Discarded concrete 8 Frame shape section 10 Standing angle 12 U-shaped support 14 Bracket 16 L-shaped angle member 17 Through hole 18 Bolt 19, 20 Nut 24 Washer 26 Large sleeve 28 Small sleeve 30 Medium Sleeve 32 Shaped plate member 34 Steel plate material 36 Through hole 38 Nut 40 Fixing plate 42 Nut 44 Anchor bolt 50 Anchor bolt installation bases 52, 54 Legs 56, 58 Receiving members 60a, 60b, 60c, 60d Standing angles 62, 64 L Mold angle member

Claims (1)

An anchor bolt installation method using a structure in which a plurality of anchor bolts are positioned and fixed on concrete discarded through a fixing stand, and
Place the anchor bolt installation base having a receiving member so that it can be adjusted horizontally and at a predetermined height on the discarded concrete,
A shape plate member that connects upper end portions of the plurality of anchor bolts and positions them relative to each other in the horizontal direction is placed on the receiving member,
Perform horizontal alignment of the anchor bolt by moving the shape plate member in the horizontal direction,
Assembling the fixing base between the plurality of anchor bolts and the waste concrete,
An anchor bolt installation method, wherein the anchor bolt installation base is disassembled and removed from the discarded concrete before arranging reinforcing bars around the anchor bolt.

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