JPH0384165A - Execution of setting of anchor bolt and setting apparatus therefor - Google Patents

Abstract

PURPOSE:To accurately embed anchor bolts in desired positions with their attitude controlled by temporarily tightening the anchor bolts in a form, and by placing concrete therein with a setting apparatus that are installed to a position corresponding to the anchor bolts fixed to the form. CONSTITUTION:Leveling concrete 3 is placed over a bearing subsoil 2 and forms 4 are erected on upper face thereof. Then four hole-in-anchors 6 are driven into the leveling concrete 3 and are made to sustain fitting-up bolts 7, and anchor bolts 1 that are installed form above are held therewith. A setting apparatus 10 is fixed to the forms 4 and tips of the anchor bolts 1 are inserted into through holes 17 and are fixed thereto with positioning made using the center line of the form 4 as a standard. Reinforcement 5 are then arranged in the form and ready-mixed concrete is placed therein. Thereby attitudes of the anchor bolts 1 are secured by the apparatus 10, being prevented from becom ing aslant or moving, and are accurately embedded in desired positions.

Description

[Detailed Description of the Invention] [Field of Industrial Application: The present invention relates to an anchor bolt installation method and an anchor bolt setting device, and more specifically, to a method for accurately placing an anchor bolt into a foundation structure when pouring a concrete foundation. The present invention relates to a method for constructing an anchor bolt that can be embedded and an anchor bolt setting tool used in the method.

[Conventional technology]

Generally, the column base of a steel structure or reinforced steel structure, or the base plate of a mount for relatively large equipment, is locked to the head of an anchor bolt embedded in the concrete foundation, and the column or column of the completed structure is External forces such as pull-out forces or horizontal shear forces applied to the trestle are transmitted to the concrete foundation as tensile or shear stresses acting on the base plate and anchor bolts.

Such anchor bolts are positioned at desired positions within the formwork using a ruler or prefabricated templates during foundation formwork and reinforcement construction, and their heads are positioned a predetermined length from the planned top of the concrete. It is temporarily fixed to reinforcing bars in the formwork using binding wires, and when pouring concrete into the formwork, the part below the planned top of the concrete is buried in the foundation concrete. The anchor bolt is integrally attached to the concrete of the foundation, and the head of the anchor bolt protruding from the upper surface of the foundation engages with the bolt hole of the base plate to lock the base plate to the upper surface of the foundation.

[Problem to be solved by the invention]

However, when pouring concrete, the inflow pressure of ready-mist concrete, shock or vibration applied to the formwork or reinforcing bars, etc. act on the anchor bolts, so when concrete pouring is complete, the anchor bolts are tilted as a whole. or may be displaced laterally. As a result, when installing the base plate, the head of the anchor bolt and the bolt hole of the base plate may not align, and the anchor bolt may not be able to be inserted into the bolt hole of the base plate.

As a countermeasure for cases where the anchor bolts and the bolt holes in the base plate do not align in this way, conventional methods have been to attach so-called wrappers made of styrofoam around the anchor bolts near the planned top of the concrete, or A construction method was used to correct misaligned anchor bolt heads, such as by stopping concrete pouring at a slightly lower position, and thereby making it possible to correct the position of the anchor bolt heads after the concrete had hardened. In addition, if the anchor bolt and the base plate bolt hole are extremely misaligned and the anchor bolt and base plate bolt hole cannot be aligned even by correcting the anchor bolt head, enlarge or shift the base plate bolt hole. This was actually done.

However, such correction of the position of the anchor bolt head or enlargement of the bolt hole of the base plate is undesirable for the structure of the base plate and anchor bolt, which are subject to tensile or shear stress and which transmit these stresses to the base.

The present invention has been made in view of this point, and provides a method for temporarily fixing anchor bolts within formwork for concrete foundations.
In an anchor bolt construction method that includes embedding the anchor bolt in the foundation by pouring concrete into the foundation, the base plate can be installed without correcting the position of the anchor bolt head or enlarging the bolt hole of the base plate. A first object of the present invention is to provide an anchor bolt construction method that can accurately embed an anchor bolt at a desired position in a foundation so that the anchor bolt can be locked.

A second object of the present invention is to provide an anchor bolt setting tool used in the above construction method.

[Means to solve the problem]

The present inventor has focused on the fact that the inclination or lateral displacement of anchor bolts during concrete pouring is caused by loosening of binding wires that temporarily fasten anchor bolts to reinforcement, or movement of reinforcement. In order to achieve the first object of the present invention, in the anchor bolt construction method, a circular opening having an inner diameter slightly larger than the outer diameter of the anchor bolt is located at a position corresponding to the arrangement of the anchor bolt. fixing the provided setting equipment to the formwork;
The setting tool held at least the head of the anchor bolt during pouring of the concrete.

In the anchor bolt construction method with this configuration, the head of the anchor bolt is inserted into the circular opening of the setting tool, and the setting tool maintains the relative position with the formwork and the relative positions of the anchor bolts with each other. , Anchor bolts may become tilted due to inflow pressure of concrete during concrete pouring or vibration of formwork and reinforcing bars.
Alternatively, it can be buried in a concrete foundation at a desired location without being moved.

In an embodiment of the invention, the setting device comprises:
It is fixed to the formwork slightly above the planned top of the concrete. According to this configuration, the setting tool can be removed after concrete placement and used for anchor bolt construction in another construction area or another construction site.

In another embodiment of the present invention, the setting device is placed below the planned top of the concrete, and the setting device is buried in the foundation.

According to this configuration, it is possible to omit the step of removing the setting tool from the anchor bolt.

In a preferred embodiment of the present invention, nuts are fixed to the anchor bolt above and below the circular opening, and the nuts cooperate to clamp the setting tool. According to this configuration, the anchor bolt is firmly fixed to the setting tool by the nut, and even the slightest movement relative to the setting tool is restrained.

From another aspect, the present invention also provides an anchor comprising temporarily fixing an anchor bolt in a formwork for a concrete foundation, and embedding the anchor bolt in the foundation by pouring concrete into the foundation. In the bolt construction method, a plurality of setting tools each having a circular opening having an inner diameter slightly larger than the outer diameter of the anchor bolt at a position corresponding to the arrangement of the anchor bolt are vertically spaced apart from each other in the mold. A method for constructing anchor bolts is provided, which comprises fixing the anchor bolts to a frame and holding the anchor bolts using the setting tool while pouring the concrete. According to this configuration, the anchor bolt is held within the formwork by the setting tool, for example, at the head and at the lower or intermediate portion. Accordingly, the anchor bolt is supported by the setting device in at least two vertically spaced positions, thereby preventing tilting or lateral movement of the anchor bolt.

Preferably, the setting device is positioned and fixed with bolts based on the markings marked on the formwork. According to this configuration, it becomes possible to easily position and fix the setting tool at a predetermined position of the formwork.

The second object of the present invention is to provide a positioning member having a circular opening with an inner diameter slightly larger than the outer diameter of the anchor bolt, and a connecting means for fixing the positioning member to the formwork of the foundation. and the circular opening is arranged such that the center of the circular opening coincides with a desired central axis of the anchor bolt when the positioning member is fixed to the formwork by the connecting means. This is accomplished by a set of equipment.

In the anchor bolt setting device configured as described above, the anchor bolt is inserted into the circular opening of the positioning member, and the connecting means is fixed to the formwork of the foundation.

The above circle when the positioning member is fixed to the formwork.

Since the center of the shaped opening coincides with the central axis of the anchor bolt, that is, the desired center of the anchor bolt, the setting device
The anchor bolt can be held at a desired position within the formwork so that it does not tilt or move laterally.

In a preferred embodiment of the present invention, the positioning member is configured to be able to adjust or change the relative position of the circular opening, and the connecting means is configured to adjust the relative position of the positioning member and the formwork. or configured to be changeable. According to this configuration, the setting device finely adjusts the position of the circular opening when connecting the setting device to the formwork by adjusting or changing the relative position of the circular opening with respect to the positioning member and the relative position of the positioning member with respect to the formwork. Adjustments can be made or the setting device can be repurposed for different foundations with different anchor bolt placements or formwork shapes.

In an embodiment of the present invention, the positioning member includes a support plate and a positioning plate assembly having the positioning plate formed with the circular opening and movably supported by the support plate, The connecting means includes a plurality of bolts connected at one end to the support plate and at the other end to the formwork. According to this configuration, the relative position of the circular opening with respect to the formwork can be easily adjusted or changed by moving the positioning plate assembly relative to the support plate and adjusting or changing the fastening position between the bolt and the formwork. Can be changed.

In another embodiment of the present invention, the positioning member has four L openings each having a larger opening than the circular opening.
The auxiliary plate is composed of a mold plate and an auxiliary plate in which the circular opening is formed, the opening of the mold plate is arranged at a folded part of the mold plate, and the auxiliary plate is arranged such that the circular opening is located at the bend of the mold plate. The bent plates are connected to each other with their arms partially overlapping to form a generally square strip-shaped plate assembly. The connecting means comprises a plurality of bolts connected at one end to the square plate and at the other end to the formwork. According to this configuration, the relative position of the circular opening with respect to the formwork can be adjusted by changing or adjusting the overlapping length of the arms of each round plate and adjusting or changing the fastening position between the bolt and the formwork. Can be easily adjusted or changed.

Furthermore, by replacing the auxiliary plate with an auxiliary plate having a circular opening having a diameter different from that of the auxiliary plate, it becomes easy to use the method for constructing anchor bolts of different diameters.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an anchor bolt construction method and an anchor bolt setting tool used in the construction method according to the present invention will be described in detail with reference to the drawings.

1A and 1B are explanatory diagrams for explaining the anchor bolt installation method according to this embodiment, and FIG. 1C is a temporary fixing of the anchor bolt to the anchor bolt setting tool shown in FIG. 1A. FIG. 3 is an enlarged cross-sectional view showing the method. Further, FIG. 2 is a plan view of the anchor bolt setting device according to the present embodiment.

As shown in Figure 1A, sacrificial concrete 3 having a flat top surface is placed on supporting ground 2 that has been leveled by crushed stone construction, etc., and the foundation of a building or civil engineering structure is placed on the top surface of the sacrificial concrete 3. Formwork 4 for concrete (hereinafter simply referred to as formwork 4) is constructed for pouring concrete.In order to make the diagram clearer, underground beams, which are usually cast integrally with the foundation, are constructed. Formwork etc. are omitted.

The foundation in this example is configured as a footing foundation to support the column base (not shown) of an H-shaped steel column,
Four anchor bolts 1 are embedded to fix the column base.

In order to temporarily fix the anchor bolt 1 in the formwork 4, four hole-in anchors 6 are driven into the concrete 3, and the temporary fixing bolt 7 is supported by each hole-in anchor 6 in a substantially upright state. . The anchor bolt 1 has a temporary fixing bolt 7 slightly above its hook portion.
It is tied to the upper part of the body with a binding wire 8, and is held in a substantially upright state.

A male thread is cut into the head of the anchor bolt 1 over a predetermined length in order to tighten a double nut (not shown) for fixing the column base. 4
The temporary fixing bolt should extend upward by a predetermined length including the head of the planned concrete top of the foundation 7
Supported by

In order to position each anchor bolt 1 with respect to the formwork 4, that is, to center the anchor bolts 1, a setting device 10, shown entirely by imaginary lines, is attached to the formwork 4 slightly above the planned concrete top XX. inserted and fixed. As shown in FIG. 1C, the head of the anchor bolt 1 is inserted into a through hole 17 provided in the setting device 10, and nuts 9.9 are tightened from above and below the setting device 10. The nut 9.9 clamps the setting device 10 and locks the head of the anchor bolt 1 to the setting device 10.

As shown in FIG. 2, the setting device 10 includes four positioning plate assemblies 11 each having a through hole 17 through which the anchor bolt 1 can be inserted.
supporting plates 12.12, each supporting plate 1
A pair of connecting bolts 16.16 connecting 2.12 to each other
, a flat par 13 connected to each end portion of each support plate 12 via a pole 13a, and a fastening bolt 14.14 connected to one end of the flat par 13 and passing through the formwork 4.
, support plate) 12, and a fastening bolt 15.15 that passes through the formwork 4.

Each through hole 17 has a widthwise center spacing a set to a desired widthwise center spacing of the anchor bolt 1, and
The center distance in the length direction is set to a desired center distance in the length direction of the anchor bolt 1, and the setting device 10 is
14. Insert into the formwork 4 from above so that the head of each anchor bolt 1 passes through each through hole 17, and fasten the bolt 1).
15, it is fixed to the upper part of the formwork 4 in a horizontal position.

The head of the anchor bolt 1 is inserted into each through hole 17, and each through hole 17 restricts the sideward inclination or movement of the head of the anchor bolt 1.

3 and 4 are an enlarged plan view and an enlarged side view of the support plate 12 shown in FIG. 2 and the positioning plate assembly 11 attached to the support plate 12, and FIG. 5 is an enlarged side view of the support plate 12 shown in FIG. FIG. 3 is an enlarged longitudinal cross-sectional view taken along line A-A.

As shown in FIGS. 3 and 4, each support plate 12 has a rectangular opening in its central portion, and each positioning plate assembly 11 is provided with longitudinally extending strips on either side of the opening. is supported. Support play) 1
2 also has a bolt hole 12a formed in the central portion in the length direction through which the fastening bolt 15 can be inserted.
Bolt holes 12t) and 12b, through which bolts a can be inserted, are formed at both ends in the length direction, respectively. In addition, the support plate 12
Lower flanges 12d, 12d hang down from both end portions, and each flange 12d has a bolt hole 126 through which a bolt 16 can be inserted.

As shown in FIG. 5, the positioning plate assembly 11 is
The upper plate 11a is composed of an upper plate 11a, a lower plate 11b1, and a spacer lid, and the upper plate 11a extends substantially horizontally above the support plate 12, and both end portions thereof are bent downward on both sides of the support plate 120,
Further, the lower plate 11b extends substantially horizontally below the support plate 12 to the vicinity of the bent portion of the upper plate 11a. A circular through hole 17 into which the anchor bolt 1 can be inserted is formed in each of the upper plate 11a, the spacer lid, and the lower plate 11b. Each through hole 17 is arranged in a position that is aligned with each other when all the plates 11a, llb, and lid are aligned, and has an inner diameter slightly larger than the outer diameter of the anchor pole 1, for example, by 1 mff1.

Fixing bolts llc, llc pass through the upper plate 11a, spacer lid, and lower plate llb, and nuts are tightened to each pole llc from below.

The upper plate 11a and the lower plate 11b are arranged such that each through hole 17.17 is spaced apart by a predetermined center spacing equal to the desired longitudinal spacing of the anchor bolts 1, and by tightening each bolt IIC, the support plate ) 12 and is supported by the support plate 12.

As shown in FIG.
are connected to each other by connecting bolts 16.16, spaced apart by a predetermined center spacing a equal to the desired widthwise spacing of . Each connection bolt 16 connects each support plate 12
It is inserted through a bolt hole of the lower flange 12d, and a male thread is cut on the outer peripheral surface of the bolt hole. A pair of nuts (not shown) are screwed onto the connecting bolts 16 on both sides of each lower flange 12d, and the connecting bolts 16 are fixed to the lower flange 12d by sandwiching the lower flange 12d with each nut.

The support plates 12 and 12, positioned relative to each other by connecting bolts 16.16, are connected to fastening bolts 14.14 via respective flat pars 13, each flat par 13 being formed in its inner end portion. A bolt hole 1 formed in a bolt hole (not shown) and a support plate 12
It is fixed to each support plate 12 at a predetermined angle by tightening a bolt 13a' that passes through 2b.

Further, a bolt hole is formed in the outer end portion of each flat parr 13, and the upwardly bent hook portion of the fastening bolt 14 is inserted into this bolt hole. A nut (not shown) is fastened to the upper end of the hook portion of the fastening bolt 14, so that the flat par 13 is fastened to the fastening bolt 14.
is locked. The distance between the bolt holes formed in the inner end portion and the bolt holes formed in the outer end portion of the flat parr 13 is set to be equal for all flat parrs 13, and the hook portion of the fastening bolt 14 is connected to the through hole. It is positioned substantially at the center of the center distance a in the width direction of 17. The horizontal portion of each fastening bolt 14 extends through the formwork 4 to the outside of the formwork 4, and a nut is tightened on the outside of the formwork 4, thereby locking it to the formwork 4. .

Each support plate 12 also has a hook portion of a fastening bolt 15 bent upward and inserted into each bolt hole 12a from below, and a nut is fastened to the fastening bolt 15 above the bolt hole 12a. There is. Each fastening bolt 1
5 extends laterally and passes through the formwork 4, on the outside of which the suts are fastened.

In order to allow these fastening bolts 14 and 15 to pass through, through holes (not shown) are pre-drilled in the formwork 4, and the through holes are as follows.
Its center corresponds to the ink on the foundation and pillars inscribed on the inside surface. Therefore, each of the fastening poles 14, 15 is aligned with each center mark of the formwork 4, and each support plate 12 is positioned with respect to each center mark of the formwork 4.

Thus, the support plates 12 of the setting device 10 are fixed at desired positions with respect to the formwork 4, and each support plate 12
The positioning plate assembly 11 supported by the positioning plate assembly 11 and the through hole 17 formed in the positioning plate assembly 11 are connected to the formwork 4.
It is positioned at a desired position within the formwork 4 using each center marking marked out as a guide. The head of the anchor bolt 1 inserted into each through hole 17 is prevented from tilting or moving laterally, and is held at a desired position.

Further, as is clear from the above configuration, the positioning plate assembly 11 is configured so that the upper plate lla and the lower plate 11b can be attached to the support plate 1 by loosening the poles llc.
It is possible to move along the two band-shaped parts, and therefore, it is possible to easily make fine adjustments to the center spacing. Furthermore, the bolt 13a
The center distance a can be easily finely adjusted by loosening the bolts and displacing the tightening position of each nut relative to the connecting bolt 16. In addition, the support plate 12 can finely adjust the relative position in the longitudinal direction with respect to the formwork 4 by adjusting the tightening position of the nut with respect to each fastening bolt 14, and the tightening position of the nut with respect to each fastening bolt 15 can be finely adjusted. By adjusting, the relative position in the width direction with respect to the formwork 4 can be finely adjusted.

As shown in FIG. 1A, when the setting device 10 is positioned within the formwork 4, a predetermined amount of reinforcing bars 5 are arranged within the formwork. Note that for clarity of illustration, the reinforcing bars 5 are only partially shown.

When the predetermined reinforcement is installed in the formwork 4, ready-mist concrete is poured from above the formwork 4. While the ready mist concrete is being poured into the formwork 4, the setting device 10 restricts the inclination of the anchor bolt 1 inserted into the through hole 17 or the lateral movement of the anchor bolt 1, thereby preventing the anchor bolt 1 from moving sideways. Since the posture of the bolt 1 is ensured and the head of the anchor bolt 1 is held at a desired position, the anchor bolt 1 is maintained at a predetermined center distance a.
and bl and the formwork 4, it is vertically embedded in the foundation concrete as shown in FIG. 1B.

When a predetermined period of time has elapsed since the concrete was poured and the concrete has hardened to a certain extent, the set equipment IO is removed from the formwork 4 and used for foundation construction in another construction area, or used at another construction site. used in In this case, the setting device 10 can move the positioning plate assembly 11 along the band-shaped portion of the support plate 12 by loosening the pins, and by displacing the tightening position of each nut with respect to the connecting bolt 16. Since the relative position of the support plate 12 can be changed, the center distance and center distance a can be easily changed. Further, the support plate 12 can change the tightening position of the nut with respect to each fastening bolt 14, and can also change the fastening position of the nut with respect to each fastening pole 15. Therefore, the setting device 10 can be used for foundations with different anchor bolt spacing and formwork dimensions.

In addition, when the concrete foundation poured as described above has obtained the initial strength of the concrete, the top of the concrete is raised to a predetermined height corresponding to the height of the bottom surface of the base plate using self-leveling grout mortar. A mortar finish is applied to the top, then the formwork is dismantled and a base plate welded to the lower end of the column, ie the H-beam, is installed on the mortared surface. During concrete pouring, the setting tool 10 holds the head of the anchor bolt 1, so that the anchor bolt 1 is accurately positioned, so that each bolt hole in the base plate and the anchor bolt I The position of each anchor bolt 1 is accurately aligned with the head of the base plate, and each anchor bolt 1 can be easily inserted into each bolt hole of the base plate. Therefore,
The base plate can be installed without deforming the head of the anchor bolt 1 or enlarging the bolt hole of the base plate.

Furthermore, since the anchor bolt (1) is accurately positioned, it is possible to reduce the clearance between the diameter of the bolt hole of the base plate and the outer diameter of the anchor bolt (1). For example, in the M16 standard anchor bolt constructed using the setting tool 10 in this example, it is possible to set the clearance with the bolt hole of the base plate to about 1 mm, which was previously set to 3fflffl, but the M16 standard The clearance between the anchor bolt and the base plate bolt hole can be set extremely small. Therefore, it is possible to reduce the inner diameter of the bolt hole in the base plate and reduce cross-sectional defects in the base plate.

As described above, according to the anchor bolt construction method of this embodiment, when installing the anchor bolt 1 in the formwork 4, the head of the anchor bolt 1 is positioned by the setting tool 10, and the Since the head of the anchor bolt 1 is held in place during concrete pouring, the anchor bolt 1 is accurately embedded in the desired location of the concrete foundation. Therefore, the base plate can be easily installed without modifying the head of the anchor bolt 1 or modifying the bolt hole of the base plate of the column base after the foundation is poured.

Further, the setting device 10 can change the center distances a and b of each through hole 17, and can be adjusted according to the desired distance between the anchor bolts 1.
．． By displacing the tightening position of the nut relative to 15, the relative position between the formwork 4 and the center of each through hole 17 can be adjusted according to the shape and dimensions of the formwork. Therefore, H-type steel, engineering type steel, or channel type steel with different cross-sectional dimensions, as well as
It can be used to construct anchor bolts for the bases of columns made of steel pipes, and can also be used to construct foundations with different formwork shapes and dimensions.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the invention set forth in the claims.

For example, in FIG. 1A, it is also possible to arrange the setting device 10 at the height indicated by the imaginary line Y-Y, that is, at a position slightly below the planned top of the concrete. In this case, the setting tool 10 is poured into the concrete of the installed foundation without being diverted to the construction of other foundations. Therefore, it is possible to omit the effort of removing the setting device 10 after concrete pouring.

In addition, in FIG. 1A, the plurality of setting devices 10 are placed at a height near the head of the anchor bolt 1, and at an intermediate position between the head of the anchor bolt 1 and the lower hook, that is, a virtual line z'-z is shown in FIG. ' and a position slightly above the lower hook of the anchor bolt 1, i.e. at the height indicated by the imaginary line Z-Z, or alternatively in two of these three positions. can do. In this case, the anchor bolt 1 is supported by a plurality of setting tools 10 spaced apart in the vertical direction, so that the anchor bolt 1 is prevented from falling or being displaced during concrete pouring. Note that the setting device 10 placed below the planned top of the concrete XX is driven into the concrete of the installed foundation. In this example, when the anchor bolt l is held by two setting devices 10, the setting devices 10 are used to hold the anchor bolt 1 in order to increase the vertical support interval and further stabilize the anchor bolt 1. It is best to place it near the head and slightly above the lower hook indicated by Z-Z, so that the anchor pole) 1
Falling down or displacement is more reliably prevented.

Furthermore, the setting device 10, as shown in FIG. 6A,
It is also possible to construct it with a generally rectangular strip-shaped support plate assembly 12.

FIG. 6A is a plan view showing a modification of the setting device;
FIGS. 6B and 6C are enlarged plan views of the dovetail plate and the auxiliary plate, respectively, making up the support plate assembly shown in FIG. 6A.

As shown in FIG. 6A, the setting device 10' is composed of a support plate assembly 12 and fastening bolts 14 and 15 for fixing the support plate 12 to the formwork 4, and mainly consists of square steel pipes. Suitable for holding anchor bolts for fixing column bases of columns (shown in phantom lines).

The support plate assembly 12 includes four L-shaped plates 121.
and four auxiliary plates 122, and as shown in FIG. 6B, an anchor bolt of the maximum diameter to be used with the setting device 10', for example, an anchor bolt of M30 standard, is attached to the bent part of each round plate 121. Through hole 17 corresponding to
' is formed, and a plurality of bolt holes 124 are provided around the through hole 17'. Furthermore, bolt holes 123 are drilled in each arm portion of each round play (121) at predetermined intervals. Also, auxiliary plate 1
22 shows the anchor bolt 1 that should actually be embedded in the foundation.
A circular through hole 1 with an inner diameter slightly larger than the outer diameter of
7 is drilled.

That is, the through hole 17' is used only when installing an anchor bolt with the largest diameter, and when installing an anchor bolt with an outer diameter smaller than the anchor bolt, for example, an M16 standard anchor bolt, the through hole 17' is used only when installing an anchor bolt with the largest diameter. An auxiliary plate 122 is used, which is provided with a through hole 17 having a predetermined inner diameter smaller than 17', for example, an inner diameter corresponding to an M16 standard anchor bolt. The auxiliary plate 122 is formed with a plurality of bolt holes 125 for fixing it to the L-shaped plate 121, and the auxiliary plate 122 has a plurality of bolt holes 125 formed therein for fixing it to the L-shaped plate 121.As shown in FIG. Each plate is bolted to the bent portion of the round plate 121 with the holes 125 aligned with each other.

The respective dowel-shaped plates 121 are bolted to each other with the respective bolt holes 123 aligned, and as shown in FIG. 2, constitute the support plate assembly 12 consisting of a band-shaped frame having a square overall shape. The distance between the centers of the through holes 17 of each auxiliary plate 122 is equal to the distance between the centers of the anchor bolts 1, and when the support plate 12 is inserted into the formwork 4 from above,
The heads of each anchor bolt 1 are inserted into each through hole 17 and positioned relative to each other.

Also, conclusion Pol) 14 and C? 15, the inner end thereof is bent upward to form a hook portion, and the hook portion is inserted into the bent portion of the L-shaped support plate 121 and the bolt holes 12 and 6 provided in the auxiliary plate 122. inserted,
A nut is screwed onto the upper side of the L-shaped plate 121. Further, the outer end portions of the fastening bolts 14 and 15 penetrate the formwork 4 slightly above the top of the planned concrete, and the nuts are tightened on the outside of the formwork 4.
It is fixed to the formwork 4.

Similarly to the setting device shown in FIG. 2, the setting device 10' configured as described above also holds the head of the anchor bolt 1 in a predetermined position during concrete pouring, and prevents the anchor bolt 1 from falling or falling. Since displacement is prevented, the setting device 1
The anchor bolt 1 held by 0' is embedded in the foundation at the correct position.

In addition, in the type of column pedestal shown in Figure 6A, the embedding interval of the anchor bolts for fixing the column pedestal, which is set according to the cross-sectional dimensions of the square steel pipe, increases as the square steel tube with a larger diameter standard is selected. , generally 25mm x route 2 (approximately 35mm
), the setting device 10 has bolt holes 123 provided in the arm portions of the L-shaped plate 121.
The mutual spacing between the two is set to about 35 mm. Therefore, when the setting tool 10' is used to install anchor bolts for fixing column bases of square steel pipes of different sizes, the setting tool 10' can be used to adjust the distance between the through holes 17 by shifting the bolt holes 123 and bolting the L-shaped plate 121. can be easily set to the desired anchor bolt spacing.

〔Effect of the invention〕

According to the configuration of the present invention described in claims 1 to 4, the anchor bolt is temporarily fixed within the formwork of the concrete foundation,
In an anchor bolt construction method that includes embedding the anchor bolt in the foundation by pouring concrete into the foundation, the base plate can be installed without correcting the position of the anchor bolt head or enlarging the bolt hole of the base plate. It becomes possible to provide an anchor bolt construction method that can accurately embed the anchor bolt in a desired position of the foundation so that the anchor bolt can be locked.

According to the configurations of the present invention described in claims 5 to 8, it is possible to provide an anchor bolt setting tool used in the above construction method.

[Brief explanation of drawings]

1A and 1B are explanatory diagrams for explaining an embodiment of the anchor bolt construction method according to the present invention, and FIG. 1C is an explanatory diagram for explaining an embodiment of the anchor bolt installation method according to the present invention. FIG. 3 is an enlarged sectional view showing a temporary fixing method. FIG. 2 is a plan view showing an embodiment of the anchor bolt setting device according to the present invention, and FIGS.
5 is an enlarged plan view and an enlarged side view of the support plate shown in the figure and the positioning member attached to the support plate, and FIG. 5 is an enlarged longitudinal cross-sectional view taken along the line AA in FIG. 3. FIG. 6A is a plan view showing another embodiment of the anchor bolt setting device according to the present invention, and FIGS. 6B and 6C are
The figures are enlarged plan views of each of the round plates and auxiliary plates that make up the support plate assembly shown in FIG. 6A. 1... Anchor bolt, 2... Supporting ground, 3... Discarded concrete, 4... Formwork, 5... Rebar, 6... Hole-in anchor 7... Temporary reinforcing bar, 8... Binding wire, 9... Nut, 10.10'... Setting device, 11... Positioning plate assembly, 12... Support plate, 13... Flat bar 14.15...・Tightening bolt, 17.17'...Through hole. Figure 1A Figure 1B Figure 1C Figure 2'! :! leaf

Claims (1)

[Claims] (1) An anchor bolt construction method comprising temporarily fixing the anchor bolt in a formwork for a concrete foundation, and embedding the anchor bolt in the foundation by pouring concrete into the foundation. A setting tool having a circular opening having an inner diameter slightly larger than the outer diameter of the anchor bolt at a position corresponding to the arrangement of the anchor bolt is fixed to the formwork, and using the setting tool,
A method for constructing an anchor bolt, characterized in that at least the head of the anchor bolt is held while the concrete is being poured. (2) The method for constructing an anchor bolt according to claim 1, characterized in that the setting device is placed below the expected top of the concrete, and the setting device is buried in the foundation. (3) An anchor bolt construction method comprising temporarily fixing an anchor bolt in a formwork for a concrete foundation and embedding the anchor bolt in the foundation by pouring concrete into the foundation. A plurality of setting tools each having a circular opening having an inner diameter slightly larger than the outer diameter and provided at a position corresponding to the arrangement of the anchor bolts are respectively fixed to the formwork at intervals in the vertical direction, and by the setting tools. . A method for constructing an anchor bolt, comprising holding the anchor bolt while pouring the concrete. (4) Any one of claims (1) to (3), characterized in that the setting device is positioned and fixed to the formwork by a plurality of bolts based on a center mark marked on the formwork. The method for constructing the anchor bolt according to item 1. (5) A positioning member having a circular opening with an inner diameter slightly larger than the outer diameter of the anchor bolt, and a connecting means for fixing the positioning member to the formwork of the foundation, the circular opening An anchor bolt setting device characterized in that the positioning member is arranged so that the center of the circular opening coincides with a desired center axis of the anchor bolt when the positioning member is fixed to the formwork by means. (6) The positioning member is characterized in that the relative position of the circular opening can be adjusted or changed, and the connecting means is characterized in that the relative position between the positioning member and the formwork can be adjusted or changed. The anchor bolt setting device according to item (5). (7) The positioning member includes a support plate and a positioning plate assembly having the positioning plate in which the circular opening is formed and movably supported by the support plate, and the connecting means has one end connected to the support plate. The anchor bolt setting device according to claim 6, comprising a plurality of bolts connected to a support plate and the other end connected to the formwork. (8) The positioning member is composed of four L-shaped plates having openings larger than the circular opening, and an auxiliary plate in which the circular opening is formed, and the opening of the L-shaped plate is the auxiliary plate is fixed to the fold of the L-shaped plate such that the circular opening is surrounded by the edge of the opening of the L-shaped plate; are connected to each other in an overlapping manner to form a generally square strip plate assembly; The anchor bolt setting device according to claim 6, characterized in that it consists of a bolt.