JP2008274713A - Holder for anchor bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holder for an anchor bolt enabling the easy avoidance of contact between the anchor bolt and a reinforcement when the anchor bolt is brought into contact with the reinforcement before a foundation concrete is deposited and not affected by the distance of an opposed mold. <P>SOLUTION: This holder comprises: a pedestal 11 having a reference surface 12 in contact with the upper surface of a mold F and a vertically extending contact surface 13; downward extending member 21 having a vertical part 24 in contact with the contact surface 13 and a base plate 23 holding the anchor bolt A; a fixing device 52 for attaching the pedestal 11 to the mold F; and joining devices 31, 32 for integrating the pedestal 11 and the downward extending member 21 with each other. The vertical part 24 is allowed to move in the vertical direction by a guide piece 14 for easy adjustment of the holding height of the anchor bolt A, and can hold the anchor bolt A merely by one pedestal 11. Consequently, the anchor bolt A can be installed when only one side mold F is assembled. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an anchor bolt retainer used when placing foundation concrete on which a building is placed.

  A wooden building is constructed by placing foundations and pillars on foundation concrete upright from the ground. In recent buildings, foundations and pillars are firmly integrated with foundation concrete for the purpose of improving earthquake resistance, and anchor bolts are often embedded in the foundation concrete. This anchor bolt has a male thread formed near the end face of a deformed steel bar. The tip of the anchor bolt is inserted into the base, and the base or pillar is drawn to the foundation concrete via a nut or various hardware. Yes. Also, with the widespread use of laminated wood with large cross-sections, large-scale wooden buildings are often constructed, but in this case as well, anchor bolts are used to ensure the strength of the building, and pillars etc. are used. It is firmly integrated with the foundation concrete.

The anchor bolt needs to be embedded at a predetermined position based on the design drawing, and a dedicated holder as shown in FIG. 6 is used until the foundation concrete is solidified. The holder shown in this figure is attached so as to straddle the oppositely disposed molds, and supports the anchor bolt at the center. Furthermore, the holder is integrated with the mold with nails or the like so that the anchor bolt does not move due to the pressure when the concrete flows, and the holder is removed after the concrete is solidified. In addition, about the concrete concrete holding fixture, the technical development aiming at the improvement of precision, workability improvement, etc. is advanced, and the following patent documents etc. are open | released.
JP 2005-315021 A JP 2006-152752 A

  Reinforcing steel bars are embedded in the foundation concrete to ensure strength. In addition, since the both ends of the holder as shown in FIG. 6 are mounted on the upper surface of the mold, they are assembled after the mold is installed. However, in this case, the anchor bolt may contact the reinforcing bar in the mold. is there. Since the anchor bolt is positioned in the design drawing and this change is difficult, usually the rebar is reassembled locally, but in that case, a large work to remove the formwork is necessary, Waste time and effort.

  For basic concrete constructed with a general wooden building, it is sufficient if there is a width that allows the foundation to be placed securely, and the cross-sectional shape does not change significantly in the middle. However, in the case of a large-scale wooden building, the cross-sectional area of the pillar is inevitably large, and it is necessary to locally expand the width of the foundation concrete where the pillar is installed. In the case where anchor bolts are embedded in such a place, the distance between the opposing molds is long and difficult to use in a conventional holder that straddles the molds. Therefore, it is necessary to take measures such as preparing a long holder or temporarily receiving it with an iron plate.

  The present invention was developed on the basis of such circumstances, and when the anchor bolt and the reinforcing bar come into contact with each other prior to placing the concrete concrete, the avoidance measures can be easily implemented, and the distance between the opposing molds is affected. The purpose of the present invention is to provide a secure anchor bolt holder.

  The invention according to claim 1 for solving the above-mentioned problem is used for embedding an anchor bolt in a fixed position in a mold, and a reference surface that contacts the upper surface of the mold and an abutment orthogonal to the reference surface A hanging member comprising: a pedestal provided with a surface; a vertical portion that contacts the contact surface and extends in a vertical direction; and a base plate that extends in a horizontal direction from the vertical portion and holds an anchor bolt; The fixture includes a fixture for fixing the pedestal to the formwork, and a joint for attaching the hanging member to the pedestal so that the height can be adjusted. A vertical portion is guided in the vertical direction on the contact surface. The anchor bolt holder is characterized in that it includes a restricting means, and the hanging member is cantilevered by a single pedestal.

  The holder according to the present invention is configured around a pedestal and a hanging member, and in a state in which the reinforcing bars have already been assembled before the foundation concrete is placed, the pair of molds arranged between the reinforcing bars. Of these, only one of the formwork is used when it is installed. The pedestal has a function of placing the entire holder on the mold, and has two planes, a reference surface placed on the upper surface of the mold and an abutting surface extending perpendicularly from the reference surface. The reference surface needs to be a flat surface with no irregularities so that it can be stably placed on the upper surface of the mold, and has a size that matches the width of the mold, but the length may be freely determined. One abutting surface is a wall-like plane extending in the vertical direction, and is used in the same plane as the inside of the mold. Thus, the pedestal needs to have two planes orthogonal to each other, and is manufactured by a method such as cutting L-shaped steel into a predetermined length.

  The hanging member has a function of actually holding the anchor bolt, and is fixed to a predetermined position by a pedestal. The hanging member is used by being inserted into the mold, and includes a vertical portion and a base plate. The vertical portion is a simple belt-like plate that comes into contact with the contact surface of the pedestal, and is literally used in an upright state. The base plate is a horizontally extending plate for fixing the anchor bolt, and is integrated with the lower side of the vertical portion in some form. Therefore, the drooping member has an L-shaped appearance as a whole. As a method of fixing the anchor bolt to the base plate, a hole can be provided on the surface of the base plate, and the anchor bolt can be inserted into the hole and then sandwiched between two nuts.

  The fixture is used to integrate the base and the formwork. Of course, the pedestal can be moved freely only by placing the pedestal on the upper surface of the mold, and it is impossible to hold the anchor bolt. Therefore, the pedestal needs to be firmly integrated with the formwork by a fixture. A specific example of the fixture is a vise, and the base surface of the base and the upper surface of the formwork are sandwiched together to make the base stationary. In addition, a nail may be used as a fixture and driven from the base toward the mold.

  The joining tool is used to press the vertical portion against the contact surface in order to integrate the base and the hanging member. As a specific example, in addition to a vise, a bolt that penetrates the vertical portion and the abutting surface may be inserted, and a nut may be screwed into the bolt so that both are brought into close contact with each other. In addition, since the drooping member by this invention is supported by only one base, a connector will also be used only in one place.

  The restricting means has a function of restricting the movement of the vertical portion when the vertical portion is brought into contact with the contact surface. The base plate holding the anchor bolt needs to be adjusted in height according to the upper surface of the foundation concrete, and the hanging member is preferably easily movable in the vertical direction. Therefore, this adjustment can be easily performed by allowing only the vertical movement while restricting the horizontal movement of the vertical portion by the restricting means. As specific examples of the restricting means, two belt-like plates are joined to the contact surface and a vertical portion is sandwiched between the plates, or a key or the like is joined to the contact surface, and a groove or length is formed on the vertical portion. Examples include those that form holes. The restricting means does not necessarily have to be integrated with the pedestal, and may be configured to be detachable with a bolt or the like.

  With such a configuration, when only one of the opposing molds is installed, the pedestal can be placed on the mold and the anchor bolt can be held at a predetermined position. Therefore, even if the anchor bolt comes into contact with the reinforcing bar, it is possible to take measures such as inserting a tool or the like from the side where the formwork is not yet installed and bending the reinforcing bar locally. Further, since the anchor bolt is supported by only one pedestal, there is no influence even when the interval between the opposing molds is wide. Moreover, the height of the anchor bolt can be easily adjusted by having the restricting means on the contact surface.

  The invention according to claim 2 relates to the structure of the drooping member, and the drooping member can be separated into an L-shaped plate including a vertical portion and a base plate, and the base plate is horizontally arranged by a fastener. 2. The anchor bolt retainer according to claim 1, wherein the anchor bolt retainer is attached to the L-shaped plate in a position-adjustable state.

  The drooping member is composed of a vertically extending vertical part and a horizontally extending base plate. However, by making the base plate only separable, the base plate itself can be moved in the horizontal direction. The installation position can be adjusted more precisely. In the present invention, an L-shaped plate in which the lower portion of the vertical portion is bent at a right angle is used to support the base plate. The fastener is for attaching the base plate to the L-shaped plate, and uses simple bolts and nuts. At this time, the position of the base plate can be adjusted by forming a long hole in one of the holes through which the bolt is inserted.

  As in the first aspect of the invention, by supporting the base plate holding the anchor bolt with only one pedestal, the anchor bolt can be arranged at a predetermined position when only one mold is installed. Therefore, when contact with the reinforcing bar is found at the stage where the anchor bolt is placed in place, it is possible to take measures such as inserting a tool from the side where the formwork has not yet been installed and bending the reinforcing bar. This eliminates the need for large-scale operations such as removing the formwork, and minimizes waste of time and labor.

  In addition, according to the present invention, the anchor bolt is supported by only one pedestal, and the anchor bolt can be disposed at a fixed position without any problem even when the interval between the opposing molds is wide. Therefore, it is suitable for use in a place where a large cross-section column or the like is installed, and it is not necessary to take measures such as using a conventional long holding tool. In addition, the hanging member can be easily adjusted in height by a regulating means or the like, and has excellent workability during construction.

  As described in claim 2, by making the structure in which only the base plate can be separated, the installation position of the anchor bolt can be adjusted in the horizontal direction, and the installation range of the anchor bolt is further expanded. The positional accuracy is improved.

  FIG. 1 shows an example of the shape of an anchor bolt holder according to the present invention. FIG. 1 (A) shows the entire configuration, and FIG. 1 (B) shows a pedestal 11 alone. In this figure, the placement of the discarded concrete B has already been completed, and the formwork F for constructing the foundation concrete is installed thereon. Usually, the formwork F is arranged so as to face each other according to the width of the foundation concrete, but the product of the present invention can be used immediately when only the formwork F on one side is installed. The upper part of the formwork F protrudes horizontally, and the horizontal surface which continues in a longitudinal direction with the same width | variety is formed, The base 11 is mounted on this surface. The pedestal 11 has an L-shaped cross section and is manufactured by cutting a general-purpose steel material. The bottom surface of the pedestal 11 is a reference surface 12 that is in close contact with the upper surface of the mold F, and is finished to a flat surface without unevenness. The abutting surface 13 is a wall surface extending in the vertical direction. It arrange | positions so that it may correspond with the inner surface of F.

  The drooping member 21 is a part for holding the anchor bolt A, and is composed of an L-shaped plate 22 including a vertical portion 24 and a horizontal portion 25, a base plate 23, and the like. Of these, the vertical portion 24 of the L-shaped plate 22 is a strip-shaped steel plate extending in the vertical direction, and a vertically long hole 26 is formed at the center thereof. Further, a horizontal portion 25 extends at a right angle from the bottom of the vertical portion 24, and a bottom hole 27 is formed near the end thereof. Next, the base plate 23 has a function of actually holding the anchor bolts A. In this drawing, the base plate 23 has a shape in which branches extend on both sides so that a total of four anchor bolts A can be held collectively. A holding hole 29 is formed in the vicinity of the tip of each branch. The tip of the anchor bolt A is inserted into the hole, and the base plate 23 is sandwiched between the top and bottom using two holding nuts 30 screwed into the holding hole 29. The anchor bolt A is fixed. The anchor bolt A is made by using a general-purpose deformed steel bar as a raw material and processing a male screw at its tip.

  In a state where the pedestal 11 is simply placed on the upper surface of the mold F, the pedestal 11 can freely move. Therefore, in order to restrain this, a general-purpose vise 52 is used as a fixture. When the handle 53 is tightened with the vise 52 sandwiching the mold F and the pedestal 11, the pedestal 11 is pressed against the mold F and the two are integrated. A plurality of vise 52 may be used as necessary.

  The pedestal 11 and the hanging member 21 are integrated by a joint composed of a joining bolt 31 and a joining nut 32. In order to insert the joining bolt 31, an engagement hole 15 is formed in the contact surface 13 of the base 11, and a vertically long hole 26 is formed in the vertical portion 24 of the L-shaped plate 22. Therefore, when the joining bolt 31 is inserted into the vertically long hole 26 and the engaging hole 15 and the joining nut 32 is screwed to the tip thereof, the drooping member 21 can move within the range where the vertically long hole 26 is formed. At this time, the contact surface 13 of the base 11 and the back surface of the vertical portion 24 are in close contact with each other, but two guide pieces 14 are formed on the contact surface 13 so that the movement of the vertical portion 24 can be restricted. This guide piece 14 has a strip-shaped steel material attached to the contact surface 13, and the inner width of the two guide pieces 14 is slightly wider than the width of the vertical portion 24, and the vertical portion 24 is sandwiched therebetween. Thus, the drooping member 21 can move freely only in the vertical direction. Therefore, when the joining bolt 31 is slightly loosened, the drooping member 21 can be moved only in the vertical direction. When the joining bolt 31 is completely tightened, the drooping member 21 becomes immobile. Two guide pieces 14 in the figure are used so as to sandwich the vertical portion 24, but in some cases, only one guide piece 14 may be used on one side.

  The hanging member 21 has a structure in which the base plate 23 can be separated from the L-shaped plate 22, and the end of the base plate 23 is placed on the horizontal portion 25. Both are integrated by a fastener composed of a fastening bolt 41 and a fastening nut 42. The base plate 23 is formed with a horizontally long hole 28 through which the fastening bolt 41 is inserted, and the position can be adjusted within this range.

  In general, a black line is drawn on the upper surface of the formwork F as a position reference when the pedestal 11 is installed. In order to make the center of the base 11 coincide with the black line, the base 11 is provided with a window 16 in which the reference surface 12 is circularly cut as shown in FIG. Yes.

  FIG. 2 shows a state in which the components shown in FIG. 1 are integrated. The pedestal 11 is fixed to the mold F by a vise 52, and a joining nut 32 (not shown) is provided on the back side of the abutting surface 13, and the joining bolt 31 is screwed to the joining nut 32. Therefore, the vertical portion 24 is pressed against the contact surface 13 and is in a stationary state due to friction. Since the vertical portion 24 is sandwiched between the two guide pieces 14, the height of the vertical portion 24 can be adjusted along the longitudinally long hole 26 after slightly loosening the joining bolt 31. The base plate 23 is integrated with the horizontal portion 25 by fastening bolts 41 and fastening nuts 42 (not shown). Since the base plate 23 is formed with the horizontally long holes 28, the horizontal position can also be adjusted. Even when the rebar R and the anchor bolt A that have already been in contact with each other, if one mold F is not installed, a tool or the like can be inserted to locally detour the rebar R.

  FIG. 3 shows an embodiment different from FIG. 1, FIG. 3 (A) shows a vise 43 as a fastener, and FIG. 3 (B) shows a nail 51 as a fixture. is there. The pedestal 11 in FIG. 3A has the same shape as that in FIG. 1, but the drooping member 21 is different. The base plate 23 has a simple belt shape that holds two anchor bolts A, and is integrated with the L-shaped plate 22. A vise 43 is used as a fastener for making it. By using the vise 43 as a fastener, there is an advantage that the base plate 23 can be easily separated even when concrete droplets before solidification adhere. In FIG. 3B, a nail 51 is used as a fixture for attaching the base 11 to the formwork F. Since the nail 51 has a large resistance to external force, the movement of the base 11 can be prevented even when a large amount of concrete is poured. 3B is integrally formed as a whole, and a pipe 36 for inserting the anchor bolt A is provided on the upper surface of the base plate 23, and the anchor bolt A is fixed to this side surface. A butterfly screw 37 is inserted.

  FIG. 4 shows a specific example of the connector. FIG. 4 (A) uses a vise 33 as the connector, and FIG. 4 (B) uses a block 34 having a groove 39 as the connector. Is. The pedestal 11 in FIG. 4A has the same shape as FIG. 1, but uses a vise 33 as a connector, and when this is slightly loosened, the drooping member 21 can be moved in the vertical direction by the guide piece 14. . By using the vise 33 in this manner, the drooping member 21 can be easily removed even when concrete splashes adhere, as in FIG. FIG. 4B uses a block 34 as a joint for attaching the hanging member 21 to the base 11. Although this block 34 is rectangular, a groove 39 for inserting the vertical portion 24 is formed at the center, and a drill hole 38 is formed on both sides thereof. Further, two female screws 17 corresponding to the drill holes 38 are formed on the contact surface 13 of the base 11. When the mounting bolt 35 is inserted from the block 34 toward the female screw 17, the hanging member 21 is sandwiched and fixed between the base 11 and the block 34. The block 34 has not only a function as a connector, but also a function as a restricting means for limiting the movement of the vertical portion 24.

  FIG. 5 shows an example of the usage state of the present invention. The mold F in this figure has a wide section in order to install a column with a large cross section, and the anchor bolt A is installed therein. In such a case, in the product of the present invention, since all the anchor bolts A can be held by one pedestal 11, the shape of the mold F is not affected and the workability is excellent. In this figure, the molds F on opposite sides are assembled, but the base 11 is placed on the rear mold F, and the front mold F is used to hold the anchor bolt A. Not involved at all. Therefore, the near side formwork F can also be installed immediately before pouring concrete.

It is a perspective view which shows the example of a shape of the anchor bolt holder by this invention, (A) is the whole structure, (B) is a pedestal single-piece | unit. It is a perspective view which shows the state which integrated each component shown in FIG. It is a perspective view which shows embodiment different from FIG. 1, (A) uses a vise as a fastener, (B) uses a nail as a fixing tool. It is a perspective view which shows the specific example of a joining tool, (A) uses a vise as a joining tool, (B) uses a block with a groove | channel as a joining tool. It is a perspective view which shows the example of a use condition of this invention. An example of a conventionally used anchor bolt holder is shown. The holder is arranged so as to straddle the opposing formwork, and the anchor bolt is suspended through a pipe integrated with the holder. It is lowered.

Explanation of symbols

11 Base 12 Reference surface 13 Contact surface 14 Guide piece (regulator)
15 engagement hole 16 window 17 female screw 18 central line 21 hanging member 22 L-shaped plate 23 base plate 24 vertical part 25 horizontal part 26 vertical long hole 27 bottom hole 28 horizontal long hole 29 holding hole 30 holding nut 31 joint bolt (joint)
32 Joint nut (joint)
330,000 vise (joint)
34 blocks (joints / regulators)
35 Mounting bolt 36 Pipe 37 Butterfly screw 38 Drill hole 39 Groove 41 Fastening bolt (fastener)
42 Fastening nut (fastener)
430 thousand force (fastener)
51 Nail (fixture)
520,000 force (fixture)
53 Handle A Anchor bolt B Discard concrete F Formwork R Rebar

Claims (2)

Used to embed the anchor bolt (A) in place in the formwork (F),
A pedestal (11) having a reference surface (12) that contacts the upper surface of the mold (F) and a contact surface (13) orthogonal to the reference surface (12);
A vertical portion (24) contacting the contact surface (13) and extending in the vertical direction; and a base plate (23) extending horizontally from the vertical portion (24) and holding the anchor bolt (A). A drooping member (21) comprising:
A fixture (51 or 52) for fixing the pedestal (11) to the formwork (F);
A connector (31, 32 or 33 or 34) for attaching the hanging member (21) to the pedestal (11) so that its height can be adjusted;
Consisting of
The contact surface (13) is provided with a restricting means (14 or 34) for guiding the vertical portion (24) in the vertical direction, and the drooping member (21) is composed of one pedestal (11). The anchor bolt holder is supported by the cantilever. The hanging member (21) has a structure separable into an L-shaped plate (22) including the vertical portion (24) and a base plate (23). The base plate (23) includes fasteners (41, 42). The anchor bolt holder according to claim 1, wherein the anchor bolt holder is attached to the L-shaped plate (22) in a state in which the position thereof can be adjusted in the horizontal direction according to (43).

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