JP5672197B2 - Anchor construction method - Google Patents

Description

  The present invention relates to an anchor construction method, and more particularly to an anchor construction method in which anchor bars are fixedly disposed in through holes provided in a structure.

  Conventionally, when constructing concrete structures such as highways, bridges, buildings, condominiums, etc., it is necessary to ensure high mechanical strength, such as having an earthquake-resistant structure. The demand and necessity for securing the mechanical strength of concrete structures are increasing more and more because of the response to the earthquake and the crisis awareness of earthquakes.

  In addition, many of these concrete structures have already deteriorated in strength and aged due to use, and such structures need to be rebuilt or repaired. However, rebuilding is costly and has many problems, such as discharging a large amount of waste and restricting traffic on the surrounding roads during construction. For this reason, it was desired to perform repair and reinforcement by an appropriate method. When repairing / reinforcing concrete structures, post-construction anchors are widely used as a method of joining the reinforcing member and the concrete structure. Post-installed anchors used for reinforcement can be broadly classified into a method of inserting an anchor bar into a closed hole and a method of penetrating an anchor bar into a through hole depending on the place of use and design policy. Various types of commercially available anchor materials can be used as the method for constructing anchor bars in the blocking hole. On the other hand, the construction method for penetrating the anchor bar through the through hole is a method of injecting the anchor material after attaching the anchor bar, and injecting the anchor material.

  As shown in FIG. 1 (a), the conventional method for constructing an anchor bar in a through hole is to provide a through hole 2 in a structure 1 to inject an anchor bar 4 and an anchor material. An injection pipe 9, a discharge pipe 9 ′ for discharging surplus anchor material when the anchor material is filled in the through hole, and a lid 6 that closes both openings of the through hole are arranged. The lid 6 prevents the anchor material from overflowing out of the through hole 2 and fixes the anchor muscle 4 to the structure 1 until the anchor material injected into the through hole is solidified in the process shown in FIG. To play a role.

  Next, as shown in FIG. 1B, an anchor material 30 such as mortar or epoxy is injected into the through hole 2 from the injection pipe 9 until the through hole 2 is filled. Whether or not the anchor material is filled in the through hole can be determined by discharging the anchor material 31 from the discharge pipe 9 ′. After the filling of the anchor material 3 is completed, the injection pipe 9 and the discharge pipe 9 'can be removed as necessary.

  And after anchor material 3 was solidified completely, lid 6 was removed. FIG. 1C shows a state after the construction with the lid 6 removed. When the injection pipe 9 is not removed after filling the anchor material, the protruding excess portion of the injection pipe 9 is cut away as shown in FIG.

  However, in this construction method, the anchor material 30 is injected from the injection pipe 9 for about one day in the step of first installing and fixing the anchor bars 4, the injection pipe 9, the lid 6 and the like (state of FIG. 1A). For about one day for the solidifying process (state shown in FIG. 1B), and finally about one day for removing the excess portion of the lid 6 and the injection pipe 9 (state shown in FIG. 1C). The work required more than 3 days, and the increase in labor and cost was a problem.

  Patent Document 1 discloses a construction method for reinforcing a shearing force on an RC structure, and in particular, filling a reinforcing member insertion hole with a filler and then inserting a shear reinforcing reinforcing bar into the insertion hole. It is disclosed.

  The inventor considered an anchor construction method as shown in FIG. 2 with reference to the construction method disclosed in Patent Document 1. First, as shown in FIG. 2A, a lid 6 is installed at one opening of the through hole 2 provided in the structure 1, and the anchor material 3 is filled into the through hole 2.

  Next, as shown in FIG. 2 (b), the anchor muscle 4 is inserted into the through hole 2. When the anchor muscle 4 reaches the lid 6 covering one of the openings, a part of the lid 6 is released from the closed state, and one end of the anchor muscle 4 is passed from the part where the closed state is released, so that the anchor muscle 4 is completely To penetrate.

  As the anchor bar 4 used for repairing / reinforcing a structure, it is common to use a deformed bar shown in FIG. 3 (a), an entire screw shown in FIG. 3 (b), or a deformed bar having both ends threaded. is there. Both of the deformed reinforcing bar and the entire thread are subjected to ribs or thread irregularities on the entire surface.

  The anchor material 3 is easily attached to the surface of the anchor muscle 4 by the uneven processing of the surface of the anchor muscle. For this reason, when penetrating the anchor muscle 4 into the through hole 2 filled with the anchor material 3, as shown in FIG. Then, it is scraped out of the through hole 2 as it is. As a result, the anchor material 3 in the through hole 2 is insufficient, and the gap 5 is generated.

  In this figure, the diameter of the through hole 2 is drawn greatly exaggerated from the diameter of the anchor muscle 4 for easy understanding, whereas the diameter of the anchor muscle 4 is several centimeters, When the difference between the size of the through hole and the thickness of the anchor bar is small, as in the case where the diameter of the through hole 2 is about 1 cm larger than the diameter of the anchor bar 4, the generation of the gap in FIG. Become prominent.

  That is, the amount of the anchor material 3 remaining in the through-hole 2 when the anchor bar 4 is passed through the through-hole 2 is small, and is penetrated by unevenness on the surface of the anchor bar 4 as shown in FIG. When the anchor material 3 is scraped out of the hole 2, the anchor material in the through-hole 2 is almost lost, and a lot of gaps are generated.

  As shown in FIG. 2, the method of inserting the anchor bar after filling the through hole with the anchor material requires fewer working days than the method of fixing the anchor bar first as shown in FIG. Although there is an advantage that it can be reduced, as described above, the mechanical strength of the structure may be reduced due to the lack of the anchor material in the through hole.

JP 2006-57265 A

  The problem to be solved by the present invention is to solve the above-mentioned problem, and the work efficiency of construction in which anchor bars and anchor materials are arranged in the through holes provided in the concrete structure is high, and the anchor materials are insufficient in the through holes. It is to provide an anchor construction method that does not cause a decrease in strength.

  In order to solve the above-described problem, an invention according to claim 1 is an anchor construction method in which an anchor bar is fixedly disposed in a through-hole provided in a structure, and one opening of the through-hole is closed, The anchor material is filled into the through-hole from the other opening of the through-hole, the anchor muscle is inserted into the through-hole, and the tip of the anchor muscle reaches the vicinity of the one opening, and the anchor material Is placed so as to overflow from one end of the through hole, and the anchor material is further inserted into the through hole while pushing the overflowed anchor material into the through hole with the anchor muscle, and A part of the closed state of the opening is released, and the tip of the anchor muscle is arranged outside the through hole.

  The invention according to claim 2 is characterized in that, in the anchor construction method according to claim 1, the overflowing anchor material is replenished by an amount reduced as the anchor muscle is inserted.

  The invention according to claim 3 is the anchor construction method according to claim 1, wherein the overflowing anchor material overflows from the through-hole when the tip of the anchor bar is inserted to the vicinity of the one opening. It is characterized by using the anchor material taken out.

  The invention according to claim 4 is the anchor construction method according to any one of claims 1 to 3, wherein the anchor material is one of a cement composition and a resin-based bonding material.

  According to the invention of claim 1, in the anchor construction method in which the anchor bars are fixedly disposed in the through hole provided in the structure, one opening of the through hole is closed, and the other opening of the through hole Fill the through hole with an anchor material, insert the anchor muscle into the through hole, allow the tip of the anchor muscle to reach the vicinity of the one opening, and move the anchor material outward from one end of the through hole. Place the overflow anchor material into the through hole with the anchor bar, and insert the anchor bar further into the through hole, and partially release the closed state of the one opening. Since the tip of the anchor bar is arranged outside the through-hole, even if the bonding material in the through-hole is discharged out of the through-hole by the anchor, the bonding material is pushed into the through-hole and the penetration Formation of anchor material gaps in the hole Rukoto without, it is possible to arrange the Anchors and an anchor member simultaneously into the through hole. Accordingly, work efficiency related to the construction of the anchor is high, the anchor material in the through hole is insufficient, and there is no space between the structure and the anchor in the through hole, so that the strength of the structure can be ensured. it can.

  According to the invention of claim 2, since the overflowing anchor material is replenished by the amount reduced as the anchor muscle is inserted, the anchor material can be filled into the through-hole without excess or deficiency. Thereby, it is possible to suppress the occurrence of a space between the structure and the anchor bar in the through hole due to a shortage of the anchor material in the through hole, and to secure the mechanical strength of the structure.

  According to the invention of claim 3, since the overflowing anchor material uses the anchor material that overflows from the through hole when the tip of the anchor bar is inserted to the vicinity of one opening, the waste of the anchor material is eliminated. In addition, an increase in work cost can be suppressed.

  According to the invention of claim 4, since the anchor material is either a cement composition or a resin-based bonding material, it has high adhesiveness to anchor bars and concrete, and can ensure the mechanical strength of the structure. . In addition, since the anchor material viscosity can be easily set to an appropriate state, even when anchoring a through hole that is inclined upward from the horizontal to the structure, the anchor bar is inserted from the bottom upward. In addition, the anchor material disposed in the lower opening of the through hole can be efficiently pushed into the through hole using the anchor bar without dripping down.

It is a figure explaining the construction method of the conventional anchor. It is a figure for demonstrating the subject which this invention tends to solve. It is a figure explaining the surface shape of an anchor muscle. It is a figure explaining the Example which concerns on the construction method of the anchor of this invention. In the anchor construction method of this invention, it is a figure explaining an example of the method of replenishing a filler near the opening part of a through-hole.

Hereinafter, the present invention will be described in detail using preferred examples.
FIG. 4 is a diagram for explaining a first embodiment according to the anchor construction method of the present invention. A feature of the present invention is that, in the anchor construction method in which anchor bars are fixedly arranged in the through hole 2 provided in the structure 1, as shown in FIG. 4 (a), one opening of the through hole 2 is closed ( For example, the lid 6 is used), the anchor material 3 is filled into the through hole 2 from the other opening of the through hole, and the anchor muscle 4 is inserted into the through hole as shown in FIG. Insert the tip of the anchor muscle to the vicinity of the one opening, and place the anchor material 34 so as to overflow from one end of the through-hole as shown in FIG. While the anchor material 34 is pushed into the through-hole with the anchor muscle 4, the anchor muscle 4 is further inserted into the through-hole, and the closed state of the one opening is partially released (opening 7 in the lid 6 And the tip of the anchor muscle 4 is placed outside the through hole.

  Various means can be used as means for closing the through-hole 2, but in this embodiment, a case in which the lid 6 in which the anchor muscle 4 can pass and the hole 7 that can be opened and closed is formed is used. explain.

  In the present embodiment, as shown in FIG. 4A, before filling the anchor material 3 into the through hole 2, one opening of the through hole 2 is closed with a lid 6. For this reason, when filling the anchor material 3 into the through hole 2, the anchor material can be prevented from flowing out from the opening opposite to the side where the anchor material 3 is injected, and the anchor material 3 is efficiently put into the through hole 2. Can be filled.

  When the anchor bar 4 is inserted in the direction of arrow A into the through hole 2 filled with the anchor material 3 as shown in FIG. 4B, a part of the anchor material 3 is Extruded from the opening. For this reason, it is also possible to pre-fill the anchor material in an amount smaller than the volume of the cavity in the through hole 2 in advance.

  Also in the present invention, the anchor bar 4 has a concavo-convex shape on the surface thereof, such as a deformed bar, a full thread, or a deformed bar whose ends are threaded. For this reason, as shown in FIG. 4C, when the tip of the anchor bar is pushed out from the through hole, the anchor material 33 adheres to the irregularities on the surface of the anchor bar, and the anchor bar 4 penetrates and scrapes outside the through hole 2. Will be issued. As the length of the anchor muscle 4 penetrating to the outside of the through hole 2 increases, the amount of the anchor material scraped out increases, and the anchor material in the through hole 2 as shown in FIG. 3 is insufficient and a cavity 5 is generated.

  In order not to generate such a gap or the like in the through hole, it is necessary to arrange the anchor material 34 so that it always overflows out of the through hole. Therefore, it is preferable to replenish the anchor material by an amount reduced by insertion of the anchor as indicated by an arrow B in FIG.

A method of replenishing the anchor material to the outside of the through hole will be described with reference to FIG.
FIG. 5 is a perspective view of how the anchor material is replenished in the anchor construction method according to the present embodiment. In order to replenish the anchor material 3 by an amount reduced as the anchor muscles 4 are inserted, when the viscosity of the anchor material is sufficiently high, a certain amount of overflowing from the through hole 2 is caused in the vicinity of the opening of the through hole 2 directly. However, when the anchor material has a low viscosity or a large amount of the anchor material, as shown in FIG. It is preferable to provide the enclosure 8 and replenish the anchor material while preventing the anchor material 3 from dripping.

  The shape and installation method of the enclosure 8 are not limited as long as the anchor material 3 can be prevented from drooping. The anchor 8 can be installed and fixed before the anchor bar 4 is installed and removed after the anchor construction, or the anchor material 3 can be removed. You may install only at the stage of replenishment.

  Further, as the anchor material 34 to be replenished, it is possible to use the anchor material 32 overflowing from the through hole when the anchor muscle 4 is inserted as shown in FIG. Thereby, useless consumption of the anchor material can be suppressed, and the cost related to the construction work can be suppressed.

  Here, as the anchor material 3, a known material that has been conventionally used when constructing an anchor in a structure can be adopted, but in particular, when a cement composition or a resin-based bonding material is used, the structure The mechanical strength of the object can be secured. Further, the cement composition has high adhesion to the anchor and structure, and in particular, the viscosity can be easily adjusted. Even when the anchor bar 4 is applied upward from the horizontal, the anchor material 3 hangs down. Since the anchor material 3 can be disposed so as to overflow the through-hole 2 while being suppressed, the present invention can be suitably implemented.

  Furthermore, since the cement composition can be washed away only with water, the anchor material attached to the anchor muscle 4 can be easily washed away with water alone after the anchor muscle 4 has penetrated the through hole 2, so that a substance harmful to the environment is used. This is preferable.

  As the material of the lid 6 used in the present invention, various metals, resins, woods and the like can be used. As a method of arranging and fixing the lid 6 at one end of the through hole 2, the lid 6 and the structure 1 are bolted. Various known methods such as fastening, fixing the portion where the lid 6 and the structure 1 are in contact with each other, such as cement or mortar, and supporting with other auxiliary tools such as a mold can be employed. Further, the size and shape of the lid 6 are not particularly limited.

  Moreover, although the case where the hole 7 was formed in the lid | cover 6 as a means to cancel | release a part of obstruction | occlusion state was demonstrated, naturally the method of releasing an obstruction | occlusion state is not restricted to this, For example, only a center part is different from other parts. It is also possible to appropriately adopt a configuration in which the thin portion is formed and the thin portion is broken by the anchor 4.

  As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention is not limited to these Examples, and can change a design suitably in the range which does not deviate from the summary of this invention.

  As described above, according to the present invention, the work efficiency of placing the anchor bars and the anchor material in the through hole provided in the concrete structure is high, and the anchor material is insufficient in the through hole, causing a decrease in strength. It is possible to provide an anchor construction method that does not have any.

DESCRIPTION OF SYMBOLS 1 Structure 2 Through-hole 3 Anchor material 4 Anchor reinforcement 5 Crevice 6 Lid 7 Hole 8 Enclosure 9 Pipe

Claims (4)

In the construction method of the anchor in which the anchor muscle is fixedly arranged in the through hole provided in the structure,
Closing one opening of the through hole;
The anchor material is filled into the through hole from the other opening of the through hole,
Inserting the anchor muscle into the through-hole, allowing the tip of the anchor muscle to reach the vicinity of the one opening,
The anchor material is arranged so as to overflow from one end of the through hole,
While pushing the overflowed anchor material into the through-hole with the anchor muscle, the anchor muscle is further inserted into the through-hole, and the closed state of the one opening is partially released, An anchor construction method, wherein a tip is disposed outside the through hole. In the anchor construction method according to claim 1,
The overflowing anchor material is replenished by an amount reduced as the anchor muscle is inserted. In the anchor construction method according to claim 1,
The overflowing anchor material uses an anchor material that overflows from the through hole when the tip of the anchor bar is inserted to the vicinity of the one opening. In the construction method of the anchor in any one of Claims 1 thru | or 3,
The anchor material is either a cement composition or a resin-based bonding material.

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