JP5909019B1 - Anchor bolt mounting bracket and anchor bolt mounting method using the bracket - Google Patents

Abstract

An anchor bolt mounting bracket that can easily adjust the height position of the head of an anchor bolt and that can reliably manage the insertion length of the anchor bolt. An anchor bolt mounting bracket for disposing an anchor bolt at a predetermined position in a hole and fixing a head portion of the anchor bolt. The anchor bolt 2 has a first opening 9 into which the anchor bolt 2 can be inserted, and a position adjusting plate 3 having a locking portion 7 capable of coming into contact with an edge of the hole, and can be screwed to the anchor bolt 2. It has a size 4 that can not pass through the first opening 9, and a size that covers the position adjusting plate 3, so that the anchor bolt 2 can be inserted and the nut 4 with the throne passes. And a supporting plate 5 having a second opening of an impossible size. The position adjusting plate 3 is formed with a third opening 10 or a notch for guiding a tube for injecting grout into the hole. [Selection] Figure 1

Description

  The present invention relates to an anchor bolt mounting bracket and an anchor bolt mounting method using the bracket. More specifically, for example, the present invention relates to an anchor bolt mounting bracket for disposing an anchor bolt for reinforcing a natural ground at a predetermined position in a hole formed in the natural ground, and an anchor bolt mounting method using this hardware.

  Structures that stabilize slopes are often used in the form of sprayed concrete or sprayed frames due to the spraying method due to construction restrictions such as unevenness and height of the surface of the slope. If the slope is relatively flat, a pressure receiving plate may be used. In addition, a concrete retaining wall is used to stabilize the lower slope with a steep slope.

  On the other hand, when the geological condition of the natural ground worsens, and when the slope itself is a valley or there is a rice field or a swamp in the head of the slope, it is easy to collect water. A construction method that uses rock bolts and ground anchors together with the pressure plate is adopted as a countermeasure construction method. In recent years, in particular, as a method for reinforcing natural ground (cut), a method has been established in which lock bolts or anchor bolts (which are also called reinforcing materials) are used as the core material, and the core material is fixed to the ground with grout. is there.

  The lock bolts or anchor bolts (hereinafter referred to as “anchor bolts”) used as the core material and slope protection structures such as spray concrete and spray frame are usually made of metal plates. Integration is achieved by transmitting the tension of the anchor bolt to the plate by a nut that is applied to the surface of the protective structure and screwed into the anchor bolt. At that time, cover the head of the anchor bolt protruding from the nut or the nut itself, fill the cap with oil, and block the water from entering the head or nut of the anchor bolt from the outside. Is often adopted. When covering with such a cap, the protruding height from the plate surface is about 50 to 150 mm from the viewpoint of the required predetermined nut screwing length and the height that can be accommodated in the cap.

  As the construction method using such anchor bolts has become widespread, various problems have arisen. In other words, even if it is a part of the structure, if there is a part that protrudes from the surface of the slope structure, the projecting object may hinder pedestrians walking on narrow sidewalks, In narrow spaces, there is a concern that the car may come into contact with the protrusions. In fact, on snowy roads, when removing snow, the cap protruding from the slope structure is covered with snow and cannot be seen, so the cap may be broken. Also, from the viewpoint of landscape or aesthetics, it is desirable to make the portion protruding from the slope as low as possible.

  Further, in order to expect a predetermined fixing force of the anchor bolt, it is important to insert a predetermined length into a hole that has been precisely drilled. As a quality control, there is a method of confirming the insertion length of the anchor bolt by a nondestructive test such as ultrasonic measurement after construction, but it is difficult to obtain an appropriate length, which is a very difficult situation. It also costs money. Therefore, a method that can easily and appropriately manage the insertion length of the anchor bolt is desired.

  In Patent Document 1, as shown in FIG. 13, the head end portion of the anchor bolt 53 after construction is screwed into the nut portion 52 positioned below the presser plate 51, and the nut portion 52 is provided. A method is described in which the first fastening member 54, which is a headed head portion, is rotated to fix the presser plate 51 on the method frame 55.

  Further, in Patent Document 2, as shown in FIG. 14, the head end portion of the anchor bolt 61 after construction is protruded to the extent corresponding to the height of the nut body 62 with a ball seat, and the nut with the ball seat is provided. A mounting washer 64 having a body portion 63 having an inclined surface or a bowl-like surface for transmitting the tightening force of the body 62 is tightened by rotation of a nut body 62 with a ball seat screwed to the anchor bolt 61, and the body A method is described in which a gutter plate portion 65 formed on the outer periphery of the portion 63 is pressed against the concrete support frame 66.

Japanese Patent No. 5002517 Japanese Patent No. 5657470

  In the method described in Patent Document 1, although the height of the portion protruding from the surface of the method frame 55 can be kept low, a method of appropriately managing the position of the head end portion of the anchor bolt 53 that is the most important in construction. Is not taken into account. When the protruding length from the surface of the method frame 55 becomes longer, the nut portion 52 of the first fastening member 54 can be screwed to the anchor bolt 53, but the presser plate 51 can be pressed against the surface of the method frame 55. Can not. On the other hand, when the projecting length from the surface of the normal frame 55 becomes short, the anchor bolt 53 cannot be screwed into the nut portion 52. Thus, although it is necessary to manage the height position of the anchor bolt 53 with considerable accuracy, nothing is shown about this management method. Moreover, the insertion length in the hole of the anchor bolt 53 cannot be clarified.

  Also, in the method described in Patent Document 2, as in the method described in Patent Document 1, the height position of the head end portion of the anchor bolt 61 is important, but the position is managed. The method is not considered. Since the height of the cap 67 is kept low, the cap 67 cannot be attached if the protruding length of the head end portion of the anchor bolt 61 is too long. On the other hand, if it is too short, The screwed length is shortened and stable bolt fixing is not possible. Further, the insertion length of the anchor bolt 61 in the hole cannot be clarified.

  As described above, in the conventional method, although the anchor fixing mechanism of the head of the anchor bolt can be kept low, it is not considered to adjust the height position of the head of the anchor bolt that has been constructed. There are problems that it is difficult to implement under severe restrictions and that it is difficult to control the insertion length of the anchor bolt.

  The present invention has been made in view of such circumstances, and can easily adjust the height position of the head of the anchor bolt, and can reliably manage the insertion length of the anchor bolt. It is an object of the present invention to provide an anchor bolt mounting bracket that can be used and an anchor bolt mounting method using the bracket.

An anchor bolt mounting bracket according to one aspect of the present invention is an anchor bolt mounting bracket for disposing an anchor bolt at a predetermined position in a hole and fixing the head of the anchor bolt,
A position adjusting plate having a first opening through which the anchor bolt can be inserted, and a locking portion capable of coming into contact with an edge of the hole;
A nut with a ball seat that is screwable with the anchor bolt and cannot pass through the first opening;
A support plate having a size covering the position adjusting plate, and having a second opening through which the anchor bolt can be inserted and the ball bearing nut cannot pass,
A third opening or notch for guiding a tube for injecting grout into the hole is formed in the position adjusting plate ,
The position adjusting plate has a bowl-shaped main body,
A pair of the locking portions are formed at positions facing each other at the opening edge of the main body portion,
The first opening is formed at the bottom of the main body, and
The third opening or notch is formed in an outward extension provided between the pair of locking portions at the opening edge of the main body .

An anchor bolt mounting method according to another aspect of the present invention is a method of disposing an anchor bolt at a predetermined position in a hole using the anchor bolt mounting bracket and fixing the head of the anchor bolt,
A step of inserting the head side end of the anchor bolt to which the tube is attached into the first opening formed in the bottom of the bowl-shaped main body of the position adjusting plate;
A step of screwing the nut with the ball seat into a predetermined position of the head side end of the anchor bolt inserted through the first opening of the position adjusting plate;
An anchor bolt screwed with a nut with a ball seat is inserted into the hole from the tip side end portion of the anchor bolt, and a pair of locking portions formed at positions facing each other at the opening edge of the main body portion is the edge of the hole A step of engaging a nut with a ball seat at the edge of the first opening of the position adjustment plate that is in contact with the bolt and temporarily fixing the anchor bolt;
Injecting grout into the hole using the tube, and pulling out the tube from the joint in the hole of the tube after completion of the injection,
After grout curing, the nut with the ball seat is removed from the anchor bolt, the head side end of the anchor bolt is inserted into the second opening of the bearing plate, and the bearing plate is placed on the position adjusting plate, and the anchor bolt is removed. A step of screwing and tightening the nut with a ball seat that has been placed on the head side end of the anchor bolt.

  According to the said invention, the height position of the head of an anchor bolt can be adjusted easily, and the insertion length of an anchor bolt can be managed reliably.

It is a disassembled perspective view of one Embodiment of the anchor bolt attachment metal fitting of this invention. (A) is a top view of the position adjustment board in the anchor bolt attachment metal fitting shown by FIG. 1, (b) is the AA sectional view taken on the line. It is a front view of the nut with a ball seat in the anchor bolt mounting bracket shown in FIG. (A) is a top view of the bearing plate in the anchor bolt attachment metal fitting shown in Drawing 1, and (b) is the BB line sectional view. It is sectional drawing explaining the use condition of the anchor bolt attachment metal fitting shown by FIG. It is a figure explaining the process of the anchor bolt attachment method using the anchor bolt attachment metal fitting shown by FIG. It is a figure explaining the process of the anchor bolt attachment method using the anchor bolt attachment metal fitting shown by FIG. It is a disassembled perspective view of other embodiment of the metal fitting for anchor bolt attachment of this invention. (A) is a top view of the position adjustment board in the anchor bolt attachment metal fitting shown by FIG. 8, (b) is the CC sectional view taken on the line. (A) is a top view of the bearing plate in the anchor bolt attachment metal fitting shown in Drawing 8, and (b) is the DD line sectional view. (A) is a top view of the cap in the anchor bolt attachment metal fitting shown by FIG. 8, (b) is the EE sectional view taken on the line. It is sectional drawing explaining the use condition of the anchor bolt attachment metal fitting shown by FIG. It is sectional explanatory drawing of an example of the conventional metal fitting for anchor bolt attachment. It is sectional explanatory drawing of the other example of the conventional metal fitting for anchor bolt attachment.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.
The anchor bolt mounting bracket according to one aspect of the present invention,
(1) An anchor bolt mounting bracket for disposing the anchor bolt at a predetermined position in the hole and fixing the head of the anchor bolt,
A position adjusting plate having a first opening through which the anchor bolt can be inserted, and a locking portion capable of coming into contact with an edge of the hole;
A nut with a ball seat that is screwable with the anchor bolt and cannot pass through the first opening;
A support plate having a size covering the position adjusting plate, and having a second opening through which the anchor bolt can be inserted and the ball bearing nut cannot pass,
A third opening or notch for guiding a tube for injecting grout into the hole is formed in the position adjusting plate ,
The position adjusting plate has a bowl-shaped main body,
A pair of the locking portions are formed at positions facing each other at the opening edge of the main body portion,
The first opening is formed at the bottom of the main body, and
The third opening or notch is formed in an outward extension provided between the pair of locking portions at the opening edge of the main body .

In the anchor bolt mounting bracket according to this aspect, the nut with a ball seat cannot pass through the first opening of the position adjusting plate, so the nut with the ball seat is locked to the edge of the first opening of the position adjusting plate. Can be made. That is, the anchor bolt can be temporarily fixed. And the surplus length of the head of the anchor bolt can be easily managed by adjusting the position of the nut with ball seat screwed to the anchor bolt. Further, the insertion length of the anchor bolt in the hole can be easily managed.
After the grout injection, the position adjustment plate is left as it is, and the tension of the anchor bolt is passed through the pressure plate by placing the pressure plate on the position adjustment plate and tightening the pressure plate with a nut with a ball seat. Can communicate to natural ground or slope structure.
In addition, the position adjusting plate can be easily disposed in the hole by placing the bowl-shaped main body part in the hole and bringing the locking part into contact with the edge of the hole.

( 2 ) In the anchor bolt mounting bracket according to ( 1 ), the bearing plate has a protrusion protruding in a hook shape, and a flange formed on the periphery of the protrusion, and
It is preferable that the shape of the outer surface of the convex portion corresponds to the shape of the inner surface of the bowl-shaped main body portion, and the convex portion can be accommodated in the main body portion without a gap. In this case, the convex portion of the bearing plate that protrudes in a bowl shape can be easily disposed in the main body portion of the bowl-shaped position adjusting plate without a gap.

( 3 ) In the anchor bolt mounting bracket according to ( 2 ), a recess capable of accommodating the locking portion and the outward extension portion of the position adjusting plate is formed on the bottom surface of the flange portion of the bearing plate. It is preferable. In this case, without being disturbed by the locking portion and the outward extension portion of the position adjustment plate,

( 4 ) In the anchor bolt mounting brackets according to (1) to ( 3 ), the first opening and the second opening are sized to allow the anchor bolt to tilt with respect to the position adjusting plate and the bearing plate. In this case, even if the surface of the natural ground or the slope structure and the center axis of the hole are deviated by, for example, about 15 °, the bearing plate can be pressed against the surface.

( 5 ) In the anchor bolt mounting brackets according to the above (1) to (4), an internal thread portion for screwing a cap portion covering the nut with the ball seat can be formed on an edge portion of the bearing plate. In this case, it is possible to prevent rainwater, mud, or the like from entering the anchor bolt screwing portion by the nut with a ball seat by covering the cap.

An anchor bolt mounting method according to another aspect of the present invention is as follows.
( 6 ) A method of disposing the anchor bolt at a predetermined position in the hole using the anchor bolt mounting bracket of (1) and fixing the head of the anchor bolt,
A step of inserting the head side end of the anchor bolt to which the tube is attached into the first opening formed in the bottom of the bowl-shaped main body of the position adjusting plate;
A step of screwing the nut with the ball seat into a predetermined position of the head side end of the anchor bolt inserted through the first opening of the position adjusting plate;
An anchor bolt screwed with a nut with a ball seat is inserted into the hole from the tip side end portion of the anchor bolt, and a pair of locking portions formed at positions facing each other at the opening edge of the main body portion is the edge of the hole A step of engaging the nut with a ball seat in the first opening of the position adjusting plate that is in contact with and temporarily fixing the anchor bolt;
Injecting grout into the hole using the tube, and pulling out the tube from the joint in the hole of the tube after completion of the injection,
After grout curing, the nut with the ball seat is removed from the anchor bolt, the head side end of the anchor bolt is inserted into the second opening of the bearing plate, and the bearing plate is placed on the position adjusting plate, and the anchor bolt is removed. A step of screwing and tightening the nut with a ball seat that has been placed on the head side end of the anchor bolt.

In the anchor bolt mounting method according to this aspect, the nut with a ball seat cannot pass through the first opening of the position adjusting plate, and therefore the nut with the ball seat is locked to the edge of the first opening of the position adjusting plate. be able to. That is, the anchor bolt can be temporarily fixed. And the surplus length of the head of the anchor bolt can be easily managed by adjusting the position of the nut with ball seat screwed to the anchor bolt. Further, the insertion length of the anchor bolt in the hole can be easily managed.
After the grout injection, the position adjustment plate is left as it is, and the tension of the anchor bolt is passed through the pressure plate by placing the pressure plate on the position adjustment plate and tightening the pressure plate with a nut with a ball seat. Can communicate to natural ground or slope structure.

[Details of the embodiment of the present invention]
Hereinafter, embodiments of an anchor bolt mounting bracket and an anchor bolt mounting method using the bracket according to the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

<First embodiment>
FIG. 1 is an exploded perspective view of an anchor bolt mounting bracket (hereinafter also simply referred to as a “bracket”) 1 according to one embodiment (first embodiment) of the present invention. In FIG. 1, for the sake of clarity, the anchor bolt 2 used together with the metal fitting is also illustrated, although it is not a constituent element of the metal fitting of the present invention.

  The metal fitting 1 is a member used to dispose the anchor bolt 2 at a predetermined position in a hole formed in a natural ground or the like and to fix the head 2a of the anchor bolt 2, and includes a position adjusting plate 3 and a ball. A seated nut 4 and a bearing plate 5 are provided.

  The position adjusting plate 3 is a member having a function of temporarily fixing the anchor bolt 2 inserted into the hole when the grout is injected and accommodating the pressure plate 5 after the grout curing. The position adjusting plate 3 is held so that the anchor bolt 2 does not slide down into the hole when it is set in a hole formed in a natural ground (slope) or a slope structure such as a concrete manufacturing frame provided in the natural ground. It is only necessary to have such a strength as possible, and for example, it can be made of iron, aluminum, stainless steel, synthetic resin, mortar or the like.

As shown in FIGS. 1 and 2, the position adjustment plate 3 includes a bowl-shaped main body 6, a locking portion 7 that comes into contact with the edge of the hole, and an outward extension 8. . In the present embodiment, the main body portion 6, the locking portion 7 and the outward extension portion 8 are integrally formed.
The main body portion 6 is a portion disposed in the hole, and a long hole 9 that is a first opening through which the anchor bolt 2 can be inserted is formed in the bottom portion 6a. The position adjusting plate 3 is disposed in the hole so that the curved surface of the main body 6 having a curved surface protruding like a bowl protrudes toward the bottom of the hole. As will be described later, the size of the long hole 9 is larger than the outer diameter of the anchor bolt 2 so that the anchor bolt 2 can be inserted through the long hole 9 while being tilted with respect to the position adjusting plate 3 and the bearing plate 5. It is set large.

  A pair of locking portions 7 are formed at positions facing each other on the opening edge 6 b of the main body portion 6. Further, the outward extension portion 8 is formed between the pair of locking portions 7 at the opening edge 6 b of the main body portion 6. The outward extension 8 is formed with a hole 10 that is a third opening for guiding a tube 17 (see FIG. 6A) for injecting grout into the hole.

  The nut 4 with a ball seat serves to temporarily fix the anchor bolt 2 at the time of grout injection and to transmit the tensile force of the anchor bolt 2 to the natural ground or the slope structure through the bearing plate 5 after the grout curing. It is a member. As shown in FIG. 3, the nut 4 with a ball seat is provided with a hemispherical washer portion 12 below the hexagon nut portion 11. In this embodiment, the hexagon nut portion 11, the washer portion 12, Are integrally formed, but separate ones can be used in combination.

The bearing plate 5 is a member that presses a natural mountain or a slope structure, and in the present embodiment, is composed of an octagonal plate-like member in plan view. The bearing plate 5 can be made of, for example, iron, aluminum, stainless steel, fiber reinforced resin, fiber reinforced mortar, or the like.
As shown in FIG. 4, the bearing plate 5 includes a protruding portion 13 that protrudes like a bowl and a flange 14. The shape of the outer side surface 13 a of the convex portion 13 corresponds to the shape of the inner side surface 6 c of the bowl-shaped main body portion 6 of the position adjusting plate 3. For this reason, as shown in FIG. 5, the convex portion 13 of the bearing plate 5 can be accommodated in the main body portion 6 of the position adjusting plate 3 with almost no gap. The pressure bearing plate 5 has a size that can cover the position adjustment plate 3, and the position adjustment plate 3 can be made invisible from the outside after construction. For this reason, the position adjusting plate 3 can have a simple structure with an emphasis on function without considering design. The bottom surface of the convex portion 13 is formed with a hole 16 that is a second opening having a size that allows the anchor bolt 2 to be inserted and the ball seated nut 4 not to pass therethrough.

  The collar portion 14 of the bearing plate 5 is a portion that presses the natural ground or the slope structure using the tension of the anchor bolt 2, and the area thereof is sufficiently large to perform such a pressing function. An annular recess 15 is formed on the bottom surface 14 a of the collar portion 14 so as to accommodate the locking portion 7 and the outward extension portion 8 of the position adjusting plate 3. For this reason, in the state which covered the position adjustment board 3, the bottom face 14a of the collar part 14 can be directly contact | abutted to a natural ground or a slope structure, and the tension | tensile_strength of an anchor bolt 2 can be made effective in a natural ground or slope structure. I can tell things.

  FIG. 5 is a diagram for explaining a usage state of the metal fitting 1 according to the present embodiment. FIG. 5 shows a state in which the pressure bearing plate 5 is disposed on the position adjusting plate 3 after grout curing, and the nut 4 with a ball seat is screwed onto the anchor bolt 2 and tightened. Since the shape of the hemispherical portion of the washer portion 12 of the ball seated nut 4 corresponds to the shape of the inner side surface 13b of the convex portion 13 of the bearing plate 5, the tightening force of the ball seated nut 4 is effective. Can be transmitted to the bearing plate 5.

<Anchor bolt mounting method>
Next, a method of attaching the anchor bolt 2 in the hole using the metal fitting 1 described above will be described.
First, the position adjusting plate 3 is prepared, and the head side end portion of the anchor bolt 2 to which the grouting tube 17 is attached is inserted into the elongated hole (first opening) 9 of the position adjusting plate 3 and The tube 17 is inserted through the hole (second opening) 16 of the outer extension 8 of the position adjusting plate 3. It is preferable that the tube 17 is lightly tied to the anchor bolt 2 at several places using a string or the like so as not to be separated from the anchor bolt 2. In addition, the tube 17 is an adapter having a portion located on the ground and a portion located inside the hole 18 immediately below the position adjusting plate 3 so that the tube 17 can be easily pulled out from the hole 18 after grout injection described later. 25 (see FIG. 6A). The adapter 25 is a cylindrical body made of a synthetic resin, and a plurality of ring-shaped locking projections 25a are formed at both ends. In the present embodiment, the adapter 25 forms a joint portion in the hole of the tube 17, but a portion located on the ground of the tube 17 and a portion located inside the hole 18 by a wire (bundling wire) or the like. Can also be connected.

  Next, the nut 4 with a ball seat is screwed into a predetermined position at the head side end of the anchor bolt 2 inserted through the long hole 9 of the position adjusting plate 3. The insertion length of the anchor bolt 2 in the hole or the protrusion length of the anchor bolt 2 from the ground or the surface of the slope structure can be adjusted or managed by the screwing position of the nut 4 with ball seat at this time. . In the case of the anchor bolt 2 whose length is known in advance, the insertion length of the anchor bolt 2 in the hole can be managed by adjusting the screwing position of the ball seated nut 4.

  Next, as shown in FIG. 6A, the anchor bolt 2 to which the ball seated nut 4 is screwed is inserted into the hole 18 from the end on the tip side of the anchor bolt 2, and the locking portion 7 is inserted. However, the nut 4 with a ball seat is locked to the edge of the long hole 9 of the position adjusting plate 3 that is in contact with the edge of the hole 18 to temporarily fix the anchor bolt 2. In the present embodiment, the position adjusting plate 3 is disposed in the hole 18 of the concrete frame 20 provided on the ground. Further, a groove portion 21 (see FIG. 6B) in which the tube 17 can be disposed is formed at the opening edge portion of the hole 18 of the frame 20.

  Next, the grout G is injected into the hole 18 using the tube 17, and the tube 17 is pulled out from the hole 18 after the injection is completed. More specifically, a portion of the tube 17 located on the ground is pulled out from the joint portion of the tube 17, that is, from one connection portion of the adapter 25. And after grout curing for a predetermined period, the mortar is filled from the hole 10 of the outward extension part 8 of the position adjusting plate 3 into the space formed in the upper part of the hole 18 by the grouting G sinking ((FIG. 6 ( b)).

  After the mortar curing, as shown in FIG. 6 (c), the ball seated nut 4 used for temporary fixing is removed from the anchor bolt 2. Then, after cleaning the inner surface 6c and the like of the main body 6 of the position adjusting plate 3 to remove foreign matters such as earth and sand, the head side end of the anchor bolt 2 is removed as shown in FIG. The pressure bearing plate 5 is set in the main body 6 of the position adjusting plate 3 by being inserted into the hole 16 of the pressure bearing plate 5. In this case, since the shape of the outer side surface 13a of the convex portion 13 of the bearing plate 5 corresponds to the shape of the inner side surface 6c of the main body portion 6, the convex portion 13 is accommodated in the main body portion 6 without any gap. Can do.

  Next, as shown in FIG. 7 (e), the ball seat nut 4 removed from the anchor bolt 2 is screwed into the head side end of the anchor bolt 2 and tightened. Thereby, the bearing plate 5 can be pressed against the surface of the method frame 20, and the anchor bolt 2 and the method frame 20 can be integrated.

<Second Embodiment>
FIG. 8 is an exploded perspective view of a metal fitting 31 according to another embodiment (second embodiment) of the present invention. In FIG. 8, for the sake of easy understanding, the anchor bolt 40 used together with the metal fitting is illustrated although it is not a constituent element of the metal fitting of the present invention. The second embodiment is different from the metal fitting 1 according to the first embodiment in the configuration of the position adjusting plate and the pressure bearing plate, and further includes a cap that is not employed in the metal fitting 1.

  Like the metal fitting 1, the metal fitting 31 is a member used for disposing the anchor bolt 2 at a predetermined position in a hole formed in a natural ground and fixing the head 2a of the anchor bolt 2. An adjustment plate 32, a ball seated nut 33, a pressure bearing plate 34, and a cap 35 are provided. The functions or roles of the position adjusting plate 32, the ball seated nut 33, and the bearing plate 34 are the same as those of the position adjusting plate 3, the ball seated nut 4 and the bearing plate 5 in the metal fitting 1 according to the first embodiment. Therefore, for the sake of simplicity, description thereof will be omitted.

  As shown in FIG. 9, the position adjustment plate 32 includes a large notch 36, but includes a generally bowl-shaped main body portion 37, a locking portion 38, and an outward extension portion 29. Also in this embodiment, the main body portion 37, the locking portion 38, and the outward extension portion 39 are integrally formed of iron, aluminum, or the like.

The main body portion 37 is a portion disposed in a hole formed in a natural mountain, a slope structure or the like, and a hole 41 which is a first opening through which the anchor bolt 40 can be inserted is formed in the bottom portion 37a. Yes. The position adjusting plate 32 is disposed in the hole so that the curved surface of the main body portion 37 having a curved surface protruding in a bowl shape protrudes toward the bottom of the hole. The size of the hole 41 is set larger than the outer diameter of the anchor bolt 40 so that the anchor bolt 40 can be inserted through the hole 41 in a state in which the anchor bolt 40 is inclined with respect to the position adjusting plate 32 and the bearing plate 34.
Unlike the main body portion 6 in the first embodiment, the main body portion 37 in the present embodiment is directed inward to the periphery of the hole 41 formed in the bottom portion 37a, in other words, an annular shape that is directed to the opposite side to the bottom of the hole. A wall 37c is erected. With this annular wall 37c, the position of the support plate 34 on the position adjustment plate 32 can be easily determined.

  A pair of locking portions 38 are formed at positions facing each other on the opening edge 37 b of the main body portion 37. Further, the outward extension 39 is formed between the pair of locking portions 38 at the opening edge 37 b of the main body 37. The outward extension 39 is formed with a notch 42 for guiding a tube for injecting grout into the hole.

  As shown in FIG. 10, the pressure bearing plate 34 is formed of an octagonal plate-like member in plan view, and includes a convex portion 43 and a flange portion 44 that protrude in a hook shape. The shape of the outer side surface 43 a of the convex portion 43 corresponds to the shape of the inner side surface 37 d of the bowl-shaped main body portion 37 of the position adjusting plate 32. For this reason, as shown in FIG. 12, the convex portion 43 of the bearing plate 34 can be accommodated in the main body portion 37 of the position adjusting plate 32 with almost no gap. The pressure bearing plate 34 has a size that can cover the position adjustment plate 32, and after the construction, the position adjustment plate 32 can be made invisible from the outside. On the bottom surface of the convex portion 43, a hole 45 is formed which is a second opening of a size through which the anchor bolt 40 can be inserted and the ball seated nut 33 cannot pass.

  An annular recess 46 is formed on the bottom surface 44 a of the flange portion 44 of the pressure bearing plate 34, and can accommodate the locking portion 38 and the outward extension portion 39 of the position adjusting plate 32. For this reason, in the state which covered the position adjustment board 32, the bottom face 44a of the collar part 44 can be directly contact | abutted to a natural ground or a slope structure, and the tensile force of the anchor bolt 40 can be effectively applied to a natural ground or a slope. Can communicate to the structure.

  As shown in FIG. 11, the cap 35 is a bowl-shaped member having a recess 47 that is large enough to cover the nut 33 with a ball seat that is screwed into the anchor bolt 40. Or the like. Bolt holes 48 are formed in the peripheral portion of the cap 35, and the cap 35 is fixed to the bearing plate 34 with bolts 49 (see FIG. 8). A rubber packing 50 is disposed between the cap 35 and the bearing plate 34.

  FIG. 12 is a diagram for explaining a usage state of the metal fitting 31 according to the present embodiment. FIG. 12 shows a state in which the pressure bearing plate 34 is disposed on the position adjusting plate 32 after the grout curing, and the ball seated nut 33 is screwed onto the anchor bolt 40 and tightened. Since the shape of the hemispherical portion of the washer portion 33a of the nut 33 with ball seat corresponds to the shape of the inner surface 43b of the convex portion 43 of the bearing plate 34, the tightening force of the nut 33 with ball seat is effective. Can be transmitted to the bearing plate 34. In addition, since the hole 41 of the position adjusting plate 32 and the hole 45 of the bearing plate 34 are both sized to allow the anchor bolt 40 to be inclined, the line V perpendicular to the surface S of the natural ground or the slope structure is provided. And the center axis L of the hole (the anchor bolt 40 is usually disposed along the center axis of the hole, so that the center axis of the anchor bolt 40 substantially coincides with the center axis L of the hole, or Is parallel), for example, even if it is shifted by about 15 °, the bearing plate can be pressed against the surface S.

[Other variations]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.
For example, in the above-described embodiment, the number of the locking portions is 2, but it is also possible to employ three or more locking portions.

  In the above-described embodiment, the shape of the main body portion of the position adjusting plate and the convex portion of the pressure bearing plate is a bowl shape, but is not limited to the case where the whole is a bowl-shaped curved surface, and a part thereof It is also possible to configure only a curved surface and the rest as an inclined surface having a linear cross section.

1: Metal fitting 2: Anchor bolt 2a: Head 3: Position adjustment plate 4: Nut with ball seat 5: Supporting plate 6: Body portion 6a: Bottom portion 6b: Opening edge 6c: Inner side surface 7: Locking portion 8: Outside Extension 9: Long hole (first opening)
10: Hole (third opening)
11: Hexagon nut portion 12: Washer portion 13: Protruding portion 13a: Outer side surface 13b: Inner side surface 14: Gutter portion 14a: Bottom surface 15: Recess 16: Hole (second opening)
17: Tube 18: Hole 19: Ground 20: Leg frame 21: Groove portion 25: Adapter 25a: Locking projection 31: Metal fitting 32: Position adjusting plate 33: Nuts with ball seat 34: Bearing plate 35: Cap 36: Notch 37: body portion 37a: bottom portion 37b: opening edge 37c: wall 37d: inner surface 38: locking portion 39: outward extension portion 40: anchor bolt 41: hole (first opening)
42: Notch 43: Convex part 43a: Outer side surface 43b: Inner side surface 44: Eaves part 44a: Bottom surface 45: Hole (second opening)
46: Recess 47: Recess 48: Bolt hole 49: Bolt 50: Packing 51: Holding plate 52: Nut portion 53: Anchor bolt 54: First fastening member 61: Anchor bolt 62: Nut body with ball seat 63: Body Part 64: Mounting washer 65: Plate part 66: Concrete support 67: Cap

Claims (6)

An anchor bolt mounting bracket for disposing the anchor bolt at a predetermined position in the hole and fixing the head of the anchor bolt,
A position adjusting plate having a first opening through which the anchor bolt can be inserted, and a locking portion capable of coming into contact with an edge of the hole;
A nut with a ball seat that is screwable with the anchor bolt and cannot pass through the first opening;
A support plate having a size covering the position adjusting plate, and having a second opening through which the anchor bolt can be inserted and the ball bearing nut cannot pass,
A third opening or notch for guiding a tube for injecting grout into the hole is formed in the position adjusting plate ,
The position adjusting plate has a bowl-shaped main body,
A pair of the locking portions are formed at positions facing each other at the opening edge of the main body portion,
The first opening is formed at the bottom of the main body, and
The third opening or notch is an anchor bolt mounting bracket formed in an outwardly extending portion provided between the pair of locking portions at the opening edge of the main body portion . The bearing plate has a protrusion protruding in a bowl shape, and a flange formed on the periphery of the protrusion, and
Shape of the outer surface of the convex portion, the bowl corresponds to the shape of the inner surface of the main body portion of the shape, it is possible without clearance housed in the projecting portion of the said body portion, the anchor bolt according to claim 1 Mounting bracket. 3. The anchor bolt mounting bracket according to claim 2 , wherein a recess capable of accommodating the engaging portion and the outward extension portion of the position adjusting plate is formed on the bottom surface of the collar portion of the pressure bearing plate. The anchor bolt according to any one of claims 1 to 3 , wherein the first opening and the second opening are sized to allow an inclination of the anchor bolt with respect to the position adjusting plate and the bearing plate. Mounting bracket. The bracket for mounting an anchor bolt according to any one of claims 1 to 4 , wherein an internal thread portion for screwing a cap portion covering the nut with a ball seat is formed at an edge portion of the bearing plate. . A method of fixing an anchor bolt at a predetermined position in a hole and fixing the head of the anchor bolt using the anchor bolt mounting bracket according to claim 1,
A step of inserting the head side end of the anchor bolt to which the tube is attached into the first opening formed in the bottom of the bowl-shaped main body of the position adjusting plate;
A step of screwing the nut with the ball seat into a predetermined position of the head side end of the anchor bolt inserted through the first opening of the position adjusting plate;
An anchor bolt screwed with a nut with a ball seat is inserted into the hole from the tip side end portion of the anchor bolt, and a pair of locking portions formed at positions facing each other at the opening edge of the main body portion is the edge of the hole A step of engaging a nut with a ball seat at the edge of the first opening of the position adjustment plate that is in contact with the bolt and temporarily fixing the anchor bolt;
Injecting grout into the hole using the tube, and pulling out the tube from the joint in the hole of the tube after completion of the injection,
After grout curing, the nut with the ball seat is removed from the anchor bolt, the head side end of the anchor bolt is inserted into the second opening of the bearing plate, and the bearing plate is placed on the position adjusting plate, and the anchor bolt is removed. An anchor bolt mounting method including a step of screwing and tightening a ball bearing nut with a head side end of the anchor bolt.

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