JP6269915B2 - Anchor fixing structure and method - Google Patents

Description

  The present invention relates to an anchor fixing structure and method, and more particularly, to an anchor fixing structure and method excellent in shock absorption.

  Fix buildings to foundation concrete, fix bridge accessories to concrete substructures, and fix machine tools and equipment to concrete members (eg columns, beams, floors, walls, etc.) In some cases, anchor bolts are generally used. An anchor bolt is inserted into a die-cut part formed in a concrete structure (foundation concrete, substructure, concrete member, etc.), and concrete, mortar, epoxy acrylate resin, etc. are filled in the gap, thereby a concrete structure Embedded and fixed in.

  In such anchor anchoring structures, the anchor bolts are firmly fixed to the concrete structure, and the anchor bolts are made of metal and are not elastic enough. Tends to be a structural weakness when acted on.

  Therefore, various methods for improving the impact absorbing power of the anchor fixing structure have been proposed. For example, Patent Document 1 discloses a method of disposing a rubber material on the outer periphery of an anchor bolt, and Patent Document 2 discloses a method of disposing an impact absorbing material at a joint portion between the anchor bolt and a base plate. ing.

JP-A-7-54407 JP 2001-3313 A

  However, the fixing structure described in Patent Document 1 has a problem that the impact absorbing power depends on the thickness of the rubber material arranged on the outer periphery of the anchor bolt, and the entire anchor bolt is likely to be large. In addition, there is a problem that the adhesion strength between the anchor bolt and the rubber material is weak and the upward tensile force is weak.

  In the fixing structure described in Patent Document 2, the capacity of the shock absorbing material depends on the thickness of the base plate and the number of anchor bolts, and the capacity of the shock absorbing material may be insufficient. In addition, increasing the thickness of the base plate or increasing the number of anchor bolts in order to satisfy the capacity of the shock absorber increases the cost of parts, increases the number of parts, increases the number of work steps, etc. It was uneconomical.

  The present invention has been devised in view of the above-described problems, and an object thereof is to provide an anchor fixing structure and method capable of improving the impact absorbing power with a simple structure.

According to the present invention, in an anchor fixing structure that is inserted and embedded in a die cut portion formed in a concrete structure, the die cut portion is embedded in the concrete structure and formed by an elastic body. And a filler for fixing the anchor inserted through the mold, and the mold has a plurality of openings formed on an outer peripheral surface, and a concrete casting of the concrete structure. There is provided an anchor fixing structure comprising: a partition member that seals the opening at the time of installation; and a displacement stopper that passes through the partition member and is inserted into the opening.

According to the present invention, in the anchor fixing method that is inserted and embedded in the die cut portion formed in the concrete structure, the die cut portion is formed when the concrete structure is placed in the concrete. A mold installation step for installing a mold formed by an elastic body, and the anchor is inserted into the mold punched portion formed by the mold and filled with a filler to fix the anchor. The anchor fixing step, and the mold has a plurality of openings formed on an outer peripheral surface, and a sealing step of arranging a partition member for sealing the opening before the anchor fixing step; There is provided a detent arrangement step of passing through the partition member and inserting a detent into the opening, and an anchor fixing method is provided.

  Furthermore, you may have the partition member removal process of removing the said partition member after the concrete solidification of the said concrete structure and before the said anchor fixing process.

  According to the anchor fixing structure and method of the present invention described above, since the mold formed of the elastic body is embedded in the concrete structure, the anchor is fixed with the filler in the mold, An elastic body that acts as a buffering material can be interposed between the concrete structure and the filler, and the impact absorbing power can be improved with a simple structure.

It is sectional drawing which shows the fixing structure of the anchor which concerns on 1st embodiment of this invention. It is a figure which shows the anchor fixing structure which concerns on other embodiment of this invention, (a) is 2nd embodiment, (b) is 3rd embodiment, (c) is 4th embodiment, (d) is FIG. 10 shows a fifth embodiment. It is a figure which shows the anchor fixing structure which concerns on other embodiment of this invention, (a) is 6th embodiment, (b) is 7th embodiment, (c) is 8th embodiment, (d) is FIG. 9 shows a ninth embodiment. It is a figure which shows the anchor fixing structure which concerns on other embodiment of this invention, (a) is 10th Embodiment, (b) is 11th Embodiment, (c) is 12th Embodiment, (d) ) Shows the thirteenth embodiment. It is a figure which shows the anchor fixing method which concerns on 1st embodiment of this invention, (a) shows a mold installation process, (b) shows a concrete placement process, (c) shows a part of anchor fixation process. Yes. It is a figure which shows the anchor fixing method which concerns on 2nd embodiment of this invention, (a) is a formwork installation process, (b) is a concrete placement process, (c) The partition member removal process is shown. It is a figure which shows the usage example of the anchor fixing structure shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a sectional view showing an anchor fixing structure according to the first embodiment of the present invention.

  An anchor fixing structure 1 according to a first embodiment of the present invention is an anchor 2 fixing structure that is inserted into a die-cut portion 12 formed in a concrete structure 11 and is embedded and fixed. And a mold frame 3 formed by an elastic body and a filler 4 for fixing the anchor 2 inserted through the mold frame 3.

  The concrete structure 11 is, for example, a concrete member (for example, a concrete member for fixing a reinforcing material such as a foundation structure of a building, a substructure supporting a fallen bridge prevention device, a machine tool, equipment, or H-shaped steel). , Pillars, beams, floors, walls, etc.). The construction of the concrete structure 11 is generally performed by a mold forming process for forming a mold that holds the shape until the concrete is solidified, a casting process for placing concrete in the mold, and a curing that promotes an appropriate hydration reaction of the concrete. And a process.

  The mold 3 that forms the punched portion 12 is incorporated together with other molds in the mold framework process of the concrete structure 11. The mold 3 has a substantially columnar shape or a substantially prismatic shape with an open top, and when the concrete structure 11 is formed, a space in the mold 3 forms a die-cut portion 12. The mold 3 shown in FIG. 1 has a bottomed cylindrical shape. The other formwork used for the construction of the concrete structure 11 is removed after the concrete is solidified, but the above-described formwork 3 is used as it is embedded in the concrete structure 11 as it is.

  The mold 3 is formed of an elastic body (for example, natural rubber, synthetic rubber, epoxy resin, ABS resin, polystyrene resin, impact-absorbing plastic, etc.) that is a material having high elasticity, preferably a material having excellent impact resistance. Is done. The size (volume) of the die cutting part 12 formed by the mold 3 and the thickness of the mold 3 are appropriately set depending on conditions such as required impact resistance and the thickness of the anchor 2. By embedding the mold 3 in the concrete structure 11, an elastic body constituting a cushioning material can be interposed between the filler 4 holding the anchor 2 and the concrete structure 11, and the elasticity of the mold 3. Impact resistance can be improved by force.

  The anchor 2 is a metal or resin rod-like member fixed to the concrete structure 11, and specifically, an anchor bolt, an anchor rod, an anchor bar, or the like. The anchor 2 can be arbitrarily selected from various forms such as a J-shaped anchor bolt, an L-shaped anchor bolt, a JL-shaped anchor bolt, a single thread anchor bolt, a double thread anchor bolt, and a full thread anchor bolt.

  As shown in FIG. 1, the anchor 2 is inserted into a die-cut portion 12 formed by the mold 3 and fixed by a filler 4 that is driven into the mold 3 and filled. For the filler 4, for example, a material such as concrete, mortar, epoxy acrylate resin or the like is used. In addition, as the filler 4, a grout material mixed with expansive aluminum powder, or a concrete or mortar mixed with calcium sulfoaluminate (CSA), lime-based or lime-CSA-based expanded material is used. You may do it. When the inflatable filler 4 is used, the anchor 2 and the mold 3 can be restrained by the inflating force of the filler 4, and the fixing structure 1 strong against an upward tensile force can be formed.

  According to the anchoring structure 1 of the anchor 2 according to the above-described embodiment, the anchor 3 is fixed in the mold 3 with the filler 4 after the mold 3 formed of an elastic body is embedded in the concrete structure 11. Since it did in this way, the elastic body which acts as a shock absorbing material can be interposed between the concrete structure 11 and the filler 4, and a shock absorbing power can be improved with a simple structure.

  In particular, by bringing the formwork 3 serving as a buffer material into contact with the concrete structure 11 and the filler 4 without contacting the anchor 2, it is possible to suppress a decrease in the holding force (proof strength) of the anchor 2. Moreover, by making the formwork 3 into a bottomed structure, it is possible to improve the impact absorbing force not only for the horizontal direction but also for the force generated in the vertical direction.

  Next, an anchor 2 fixing structure 1 according to another embodiment of the present invention will be described with reference to FIGS. Here, FIG. 2 is a view showing an anchor fixing structure according to another embodiment of the present invention, in which (a) is a second embodiment, (b) is a third embodiment, and (c) is a fourth embodiment. Embodiment, (d) shows a fifth embodiment. FIG. 3 is a view showing an anchor fixing structure according to another embodiment of the present invention, in which (a) is a sixth embodiment, (b) is a seventh embodiment, (c) is an eighth embodiment, (D) shows the ninth embodiment. FIG. 4 is a view showing an anchor fixing structure according to another embodiment of the present invention, in which (a) is a tenth embodiment, (b) is an eleventh embodiment, and (c) is a twelfth embodiment. The form (d) shows the thirteenth embodiment. In addition, about the same component as 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the fixing structure 1 according to the second embodiment shown in FIG. 2A, the mold 3 has a bottomless cylindrical shape. By making the mold frame 3 into a bottomless shape, the bottom portion of the filler 4 can be brought into contact with and fixed to the concrete structure 11, and the yield strength against upward tensile force can be improved. When the concrete structure 11 is placed in the concrete, the bottom of the mold 3 is closed with a sealing member such as paper or a wooden frame, or a column-shaped mold is inserted into the mold 3 to form the mold. Intrusion of concrete into 3 can be suppressed.

  In the fixing structure 1 according to the third embodiment shown in FIG. 2B, the mold 3 has a cylindrical shape having irregularities in the vertical direction (extending direction of the anchor 2) on the outer peripheral surface. The unevenness is formed, for example, by increasing or decreasing the diameter of the mold 3 in the vertical direction. By forming irregularities on the outer peripheral surface of the mold 3, the contact area between the concrete structure 11 and the filler 4 can be increased, and a supporting resistance can be ensured by forming a catching portion. The fixing force of the mold 3 can be improved, and the proof stress against the upward tensile force can be improved. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  In the fixing structure 1 according to the fourth embodiment shown in FIG. 2C, a locking portion 31 for locking the anchor 2 is formed at the bottom of the bottomed mold 3. The locking part 31 has a hole in which the anchor 2 can be press-fitted or screwed. By forming the engaging portion 31 in the mold 3, the anchor 2 and the mold 3 can be mechanically connected, the anchor 2 can be more firmly fixed, and the strength against an upward tensile force. Can be improved.

  The fixing structure 1 according to the fifth embodiment shown in FIG. 2D has a cylindrical shape in which the mold 3 has unevenness in the horizontal direction (direction in a plane perpendicular to the anchor 2) on the outer peripheral surface. Yes. Here, FIG. 2D illustrates a plan view of the fixing structure 1. The unevenness is formed, for example, by increasing or decreasing the diameter of the mold 3 along the horizontal direction. By forming irregularities on the outer peripheral surface of the mold 3, the contact area between the concrete structure 11 and the filler 4 can be increased, the fixing force of the mold 3 can be improved, and the upward tensile force It is possible to improve the proof strength against. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  The fixing structure 1 according to the sixth embodiment shown in FIG. 3A has a cylindrical shape in which the mold 3 extends obliquely. Specifically, the center line M of the mold 3 is inclined with respect to the extending direction L of the anchor 2. Thus, by shifting the center line M of the mold 3 and the extending direction L of the anchor 2, the engagement force between the mold 3 and the concrete structure 11 can be improved, and the proof strength against the upward tensile force can be increased. Can be improved. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  The fixing structure 1 according to the seventh embodiment shown in FIG. 3B has a cylindrical shape that extends so that the mold 3 meanders in a substantially S shape. Even with such a configuration, the center line M of the mold 3 and the extending direction L of the anchor 2 can be shifted (inclined), which has the same effect as that of the sixth embodiment, and is shown in the sixth embodiment. The horizontal size (width) can be made smaller than that of the mold 3. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  The fixing structure 1 according to the eighth embodiment shown in FIG. 3C has a cylindrical shape in which the mold 3 is uniformly expanded toward the bottom. Specifically, the mold 3 has a truncated cone shape or a truncated pyramid shape, and the upper side (the surface side of the concrete structure 11) is narrow and the bottom side is wide. According to such a configuration, even when a large upward tensile force acts on the anchor 2, the yield strength can be improved by the wedge effect of the mold 3. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  The fixing structure 1 according to the ninth embodiment shown in FIG. 3D has a cylindrical shape in which the mold 3 is expanded in a smooth curved shape toward the bottom. By changing the expansion ratio on the outer peripheral surface of the mold 3 along the extending direction of the anchor 2, a substantially bowl shape as illustrated can be formed. This configuration also has the same effect as that of the eighth embodiment, and the horizontal size (width) can be made smaller than that of the mold 3 shown in the eighth embodiment. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  In the fixing structure 1 according to the tenth embodiment shown in FIG. 4A, a head plate 32 having an enlarged diameter is arranged at the bottom of the mold 3. The head plate 32 has a circular shape or a rectangular shape, and has a lateral width larger than the diameter of the mold 3. The head plate 32 may be made of resin, may be made of metal, may be formed integrally with the mold 3, and is formed separately so that it can be retrofitted. May be. By disposing the head plate 32 at the bottom of the mold 3, the engagement force between the mold 3 and the concrete structure 11 can be improved, and the yield strength against the upward tensile force can be improved. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  In the fixing structure 1 according to the eleventh embodiment shown in FIG. 4B, a plurality of detents 33 are arranged on the outer peripheral surface of the mold 3. The stopper 33 is, for example, a rod-shaped protrusion. The stopper 33 may be made of resin, may be made of metal, may be formed integrally with the mold 3, and is formed separately so as to be press-fit or screwed. May be. By disposing the stopper 33 on the outer peripheral surface of the mold 3, the engagement force between the mold 3 and the concrete structure 11 can be improved, and the yield strength against the upward tensile force can be improved. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  Moreover, you may arrange | position the slipper 33 so that the wall surface of the formwork 3 may be penetrated. By causing the stopper 33 to reach the inside of the mold 3, the engagement force between the stopper 33 and the filler 4 can be improved, and the yield strength against the upward tensile force can be further improved.

  In the fixing structure 1 according to the twelfth embodiment shown in FIG. 4C, the mold 3 has a plurality of openings 34 formed on the outer peripheral surface, and the openings 34 when the concrete structure 11 is placed in concrete. And a detent 33 that is inserted through the opening 34 and supported by the partition member 35. A plurality of openings 34 are formed in the horizontal direction and the vertical direction on the outer peripheral surface of the mold 3. The diameter of the opening 34 is formed larger than the diameter of the stopper 33. A partition member 35 is disposed in the opening 34 so that the concrete does not enter the mold 3 when the concrete structure 11 is placed into the concrete.

  The partition member 35 may be formed in any shape as long as it is formed of a material such as paper, wood, resin, metal, or the like and can seal the opening 34. The slip stopper 33 passes through the partition member 35 and is inserted into the opening 34. The slip stopper 33 may be supported by the partition member 35 and the mold 3 or may be fixed by a wire or the like (not shown). For example, when the stopper 33 is supported by the partition member 35, a hole slightly smaller than the diameter of the stopper 33 is formed in the partition member 35, and the stopper 33 is press-fitted or screwed into the hole. Can be fixed. Moreover, it is preferable to arrange | position the slipper 33 so that it may extend to both the outer side and inner side of the formwork 3. FIG.

  When the concrete structure 11 is formed using the mold 3, the leading end portion of the stopper 33 protruding from the mold 3 is embedded and fixed in the concrete. In this state, the anchor 2 can be fixed to the concrete structure 11 by inserting the anchor 2 into the mold 3 and filling the filler 4. According to the present embodiment, the concrete of the concrete structure 11 and the filler 4 can be connected by the detent 33 extending in and out of the mold 3, and the yield strength against the upward tensile force can be improved. it can. In the present embodiment, the formwork 3 may have a bottomed shape or a bottomless shape.

  The fixing structure 1 according to the thirteenth embodiment shown in FIG. 4 (d) is the same as that in the twelfth embodiment, after the partition member 35 is removed after the concrete structure 11 is solidified. Is filled with the filler 4. According to such a configuration, in the opening 34, the concrete of the concrete structure 11 and the filler 4 are brought into direct contact with each other to be integrated, thereby firmly restraining the movement of the mold 3 by the integrated portion. It is possible to further improve the yield strength against the upward tensile force. Further, by inserting the stopper 33 into the integrated portion, the shear strength of the integrated portion is dramatically improved, and the proof strength against the upward tensile force can be further improved.

  Next, the anchor 2 fixing method according to the embodiment of the present invention will be described with reference to FIGS. Here, FIG. 5 is a figure which shows the anchor fixing method which concerns on 1st embodiment of this invention, (a) is a formwork installation process, (b) is a concrete placement process, (c) An anchor fixing process Part of. FIG. 6 is a diagram showing an anchor fixing method according to the second embodiment of the present invention, in which (a) shows a mold installation step, (b) shows a concrete placing step, and (c) a partition member removal step. Show. Note that the same components as those of the fixing structure 1 described above are denoted by the same reference numerals and redundant description is omitted.

  As shown in FIGS. 5A to 5C, the anchor 2 fixing method according to the first embodiment of the present invention is inserted and embedded in a die-cut portion 12 formed in a concrete structure 11. The anchor 2 fixing method is a method of forming a mold punching portion 12 when placing concrete in a concrete structure 11 and installing a mold 3 formed of an elastic body. An anchor fixing step of inserting the anchor 2 into the formed die-cutting portion 12 and filling the filler 3 in the mold 3 to fix the anchor 2.

  As shown in FIG. 5A, the mold installation step is fixed to a reinforcing bar 13 embedded in the concrete structure 11, a mold (not shown) of the concrete structure 11, or the like. The illustration of the fixing jig for the mold 3 is omitted for convenience of explanation. In addition, here, the mold 3 of the fixing structure 1 according to the above-described first embodiment is illustrated, but it is needless to say that the mold 3 in other embodiments described above may be used. In addition, about the reinforcing bar 13, for convenience of explanation, it is illustrated by a one-dot chain line.

  Then, in order to form the concrete structure 11, concrete is driven in as shown in FIG.5 (b) (placement process). Then, if necessary, it is compacted, finished, and cured (curing process).

  After the concrete of the concrete structure 11 is solidified, that is, after the concrete structure 11 is formed, the anchor 2 is temporarily fixed to the mold 3 as shown in FIG. The anchor 2 is fixed to a substantially central portion of the mold 3 by, for example, a plate-shaped fixing jig 21. The fixing jig 21 is not limited to the illustrated one, and may have a shape capable of fixing the anchor 2 to the bottom or inner surface of the mold 3. Thereafter, by filling the inside of the mold 3 with the filler 4, the anchor 2 is fixed to the mold 3 and the anchor fixing process is completed. Finally, the fixing jig 21 is removed to form the fixing structure 1 shown in FIG.

  In the anchor 2 fixing method according to the second embodiment of the present invention, as shown in FIGS. 6A to 6C, in addition to the above-described mold installation step and anchor fixing step, the mold 3 is arranged on the outer periphery. A sealing step of disposing a partition member 35 that seals the opening 34 before the anchor fixing step, and a plurality of openings 34 formed on the surface, and penetrating the partition member 35 into the opening 34 A detent arrangement step for inserting the detent 33 and a partition member removing step for removing the partition member 35 after the concrete structure 11 is solidified and before the anchor fixing step are provided.

  6A, the mold 3 having the opening 34 is fixed to the reinforcing bar 13 embedded in the concrete structure 11, the mold (not shown) of the concrete structure 11, or the like. It is a process to do. At this time, the partition member 35 is disposed in the opening 34, and the stopper 33 is inserted through the partition member 35. The partition member 35 and the shift stopper 33 may be disposed on the mold 3 after the mold 3 is installed, or may be disposed on the mold 3 after the mold 3 is installed.

  Then, in order to form the concrete structure 11, concrete is driven in as shown in FIG. 6 (b) (placement process). Then, if necessary, it is compacted, finished, and cured (curing process). In this state, for example, the anchor 2 is fixed to the mold 3 in the same manner as the process shown in FIG. 5C, and the filler 4 is filled in the mold 3 to obtain the structure shown in FIG. The fixing structure 1 according to the twelfth embodiment shown can be formed.

  Further, as shown in FIG. 6 (c), after removing the partition member 35 arranged in the opening 34 of the mold 3, the anchor 2 is molded in the same manner as in the step shown in FIG. 5 (c). It may be fixed to the frame 3, and the filler 4 may be filled inside the mold 3. In the partition member removing step shown in FIG. 6C, since the stopper 33 is fixed to the concrete structure 11, the stopper 33 is held in the opening 34 even if the partition member 35 is removed. be able to. Through this process, the fixing structure 1 according to the thirteenth embodiment shown in FIG. 4D can be formed.

  Finally, an example of use of the fixing structure 1 of the anchor 2 described above will be described. Here, FIG. 7 is a diagram showing an example of use of the anchor fixing structure shown in FIG. In addition, about the same component as the fixing structure 1 which concerns on 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In this use example, the fixing structure 1 is used for the bridge support 5. The support 5 is installed between an upper work 51 such as a main girder or a main structure and a lower work 52 such as an abutment or a pier. The anchor 2 is fixed to a substructure 52 that is the concrete structure 11. As the fixing structure 1 of the anchor 2, any of the first to thirteenth embodiments described above may be adopted.

  In the anchoring structure 1 of the anchor 2 described above, the case where the anchor 2 is arranged vertically (vertical direction) has been described. However, the anchor 2 may be arranged horizontally (horizontal direction) or may be inclined. May be.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Fixing structure 2 Anchor 3 Mold frame 4 Filler 11 Concrete structure 12 Die-cut part 32 Head plate 33 Detent 34 Opening part 35 Partition member

Claims (3)

In the anchor anchoring structure, which is inserted and embedded in the die-cut part formed in the concrete structure,
A mold that is embedded in the concrete structure to form the punched portion and is formed of an elastic body;
A filler for fixing the anchor inserted through the mold,
The mold is inserted into the opening through a plurality of openings formed on an outer peripheral surface, a partition member that seals the opening when the concrete structure is poured into concrete, and the partition member. An anchor fixing structure characterized by having a slip stopper. In the anchoring method of an anchor inserted and embedded in a die-cut part formed in a concrete structure,
Forming step for forming a mold formed by an elastic body and forming the die-cut portion at the time of concrete placement of the concrete structure,
An anchor fixing step of inserting the anchor into the die cut portion formed by the mold and filling the filler into the mold and fixing the anchor;
The mold has a plurality of openings formed on an outer peripheral surface, and before the anchor fixing step, a sealing step of disposing a partition member for sealing the opening, and penetrating the partition member A detent arrangement step for inserting a detent into the opening, and
The anchor fixing method characterized by the above-mentioned. The anchor fixing method according to claim 2, further comprising a partition member removing step of removing the partition member after the concrete is solidified and before the anchor fixing step.