JP7064957B2 - Construction method of adhesive anchor - Google Patents

Description

The present invention relates to a method of constructing an adhesive anchor for fixing an anchor bolt using a capsule type adhesive.

When reinforcing work is performed on an existing support structure, it is conceivable to improve the maximum tensile strength (cone fracture area) of the existing concrete portion at the fixing portion of the support structure. In order to increase the cone destruction area, it is necessary to bury a new anchor bolt. In this case, a method of fixing the anchor bolt using a capsule type adhesive is generally applied.

The conventional method of constructing an adhesive anchor is to pierce the construction surface to form a perforated hole, insert a capsule-type adhesive into the perforated hole, and insert the capsule-type adhesive into the perforated hole while rotating the anchor bolt to apply the capsule-type adhesive. Crush and stir. Then, when the rotation of the anchor bolt is stopped and held for a predetermined time to cure the adhesive, the anchor bolt is fixed to the construction surface. As a method for constructing such an adhesive anchor, for example, there is one described in Patent Document 1 below.

Special Publication No. 63-66997

When reinforcing the existing support structure, the buried length of the new anchor bolt has a great influence on the expansion of the cone fracture area. However, it is difficult to lengthen the burial length of a new anchor bolt with a commonly used capsule-type adhesive, and a large number of anchor bolts will be buried. Then, there is a problem that the fixing portion of the support structure attached to the anchor bolt becomes large. In addition, in order to increase the size of the anchoring part of the support structure, it is necessary to secure sufficient construction space, and it is necessary to remove existing interfering objects in the vicinity, so depending on the type of support structure. Difficult to apply.

It should be noted that Patent Document 1 describes that a plurality of capsule-type adhesives are inserted into the perforated holes, and the plurality of capsule-type adhesives are sequentially crushed and stirred by an anchor bolt. However, in order to crush multiple capsule-type adhesives in sequence with an anchor bolt, an excessive torque is required to drive the anchor bolt while rotating it, which leads to an increase in the size of the device for driving the anchor bolt while rotating it. , Invites an increase in equipment costs.

The present invention solves the above-mentioned problems, and provides a method for constructing an adhesive anchor that suppresses an increase in the size of a fixing portion and suppresses an increase in construction cost by securing a long buried length of the anchor bolt. The purpose is to do.

The method of constructing the adhesive anchor of the present invention for achieving the above object is a step of inserting the first capsule type adhesive into the perforated hole of the construction surface and inserting the anchor bolt into the perforated hole while rotating. The step of stirring the first capsule type adhesive, the step of pulling out the anchor bolt from the hole, the step of inserting the second capsule type adhesive into the hole, and the step of rotating the anchor bolt to make the hole. It has a step of inserting into a hole and stirring the second capsule type adhesive and the first capsule type adhesive, and a step of curing the first capsule type adhesive and the second capsule type adhesive. It is characterized by.

Therefore, after stirring the first capsule type adhesive in the perforated hole with the anchor bolt, the anchor bolt is pulled out from the perforated hole, the second capsule type adhesive is inserted into the perforated hole, and the anchor bolt is used to form the second capsule type adhesive. Stir the first capsule adhesive. That is, first, only the first capsule type adhesive is stirred, and then the second capsule type adhesive and the first capsule type adhesive are stirred and cured in this order. It is possible to secure a long burial length of the anchor bolt for fixing the adhesive, and it is possible to suppress an increase in the torque of the drive device for stirring the adhesive. As a result, it is possible to suppress the increase in size of the fixing portion of the support structure supported by the anchor bolt, and it is possible to suppress the increase in size of the drive device and suppress the increase in construction cost.

The method for constructing an adhesive anchor of the present invention is characterized in that the capacity of the second capsule type adhesive is smaller than the capacity of the first capsule type adhesive.

Therefore, since the capacity of the second capsule type adhesive is small, the stirring time of the second capsule type adhesive can be shortened, and each capsule before the first capsule type adhesive in the perforated hole is cured. The type adhesive can be agitated, and a fixing portion having sufficiently high strength can be formed.

In the method of constructing the adhesive anchor of the present invention, the second capsule type adhesive is characterized in that the outer diameter and the total length are smaller than the outer diameter and the total length of the first capsule type adhesive.

Therefore, since the second capsule type adhesive is formed by using the existing capsule type adhesive, it is possible to suppress an increase in component cost.

The method for constructing an adhesive anchor of the present invention is characterized in that when the anchor bolt is pulled out from the drilled hole, the anchor bolt is rotated in the direction opposite to that when the anchor bolt is inserted into the drilled hole.

Therefore, the anchor bolt can be easily pulled out from the perforated hole, and the anchor bolt can be easily separated from the stirred first capsule type adhesive.

The method for constructing an adhesive anchor of the present invention is characterized in that the cooled first capsule type adhesive is inserted into the perforated hole.

Therefore, by cooling the first capsule adhesive and inserting it into the perforated hole, it is possible to delay the curing of the stirred first capsule adhesive, and each capsule after inserting the second capsule adhesive. It is possible to suppress an increase in the torque of the drive device for stirring the type adhesive, and it is possible to improve the workability of the second capsule type adhesive insertion work and the stirring work.

In the method for constructing the adhesive anchor of the present invention, the second capsule type adhesive is stirred by the anchor bolt, the anchor bolt is pulled out from the perforated hole, and then the third capsule type adhesive is inserted into the perforated hole. It is characterized by providing a step of inserting the anchor bolt into the perforated hole while rotating the anchor bolt and stirring the third capsule type adhesive, the second capsule type adhesive and the first capsule type adhesive. It is supposed to be.

Therefore, by using three capsule-type adhesives, the buried length of the anchor bolts for fixing the anchor bolts with the cured adhesive can be further secured, and the support structure supported by the anchor bolts can be secured. It is possible to suppress the increase in size of the fixing portion.

According to the construction method of the adhesive anchor of the present invention, it is possible to suppress the increase in size of the fixing portion and suppress the increase in the construction cost by securing the buried length of the anchor bolt for a long time.

FIG. 1 is a flowchart for explaining a method of constructing an adhesive anchor according to the present embodiment. FIG. 2 is a schematic view showing a drilling process of a drilled hole. FIG. 3 is a schematic view showing a step of inserting the first capsule type adhesive into the perforated hole. FIG. 4 is a schematic view showing a stirring process of the first capsule type adhesive with an anchor bolt. FIG. 5 is a schematic view showing an anchor bolt drawing process. FIG. 6 is a schematic view showing a step of inserting the second capsule type adhesive into the perforated hole. FIG. 7 is a schematic view showing a state in which the second capsule type adhesive is inserted into the perforated hole. FIG. 8 is a schematic view showing a stirring process of the second capsule type adhesive with an anchor bolt. FIG. 9 is a schematic view showing the tool removal process.

Hereinafter, preferred embodiments of the method for constructing the adhesive anchor according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to this embodiment, and when there are a plurality of embodiments, the present invention also includes a combination of the respective embodiments.

FIG. 1 is a flowchart for explaining a method of constructing an adhesive anchor according to the present embodiment.

In the present embodiment, as shown in FIG. 1, the method of constructing the adhesive anchor is a step of inserting the first capsule type adhesive into the drilled hole on the construction surface and inserting the anchor bolt into the drilled hole while rotating. The step of stirring the first capsule type adhesive, the step of pulling out the anchor bolt from the drilled hole, the step of inserting the second capsule type adhesive into the drilled hole, and the step of inserting the anchor bolt into the drilled hole while rotating. It has a step of stirring the second capsule type adhesive and the first capsule type adhesive, and a step of curing the first capsule type adhesive and the second capsule type adhesive.

Here, in the first capsule type adhesive and the second capsule type adhesive, for example, an aggregate (silica stone or the like), a resin material, and a curing agent are mixed in a container formed of glass or a film. And filled. The resin material and the curing agent may be composed of a thermosetting resin. Further, the capacity of the second capsule type adhesive is smaller than the capacity of the first capsule type adhesive. Specifically, the outer diameter and the total length of the second capsule type adhesive are smaller than the outer diameter and the total length of the first capsule type adhesive.

Hereinafter, the construction method of the adhesive anchor of the present embodiment will be described in detail. FIG. 2 is a schematic view showing the drilling process of the drilled hole, FIG. 3 is a schematic view showing the process of inserting the first capsule adhesive into the drilled hole, and FIG. 4 is stirring the first capsule adhesive with an anchor bolt. Schematic diagram showing the process, FIG. 5 is a schematic view showing the anchor bolt extraction process, FIG. 6 is a schematic view showing the process of inserting the second capsule type adhesive into the drilled hole, and FIG. 7 is a schematic view showing the punched hole. FIG. 8 is a schematic view showing a state in which the second capsule type adhesive is inserted, FIG. 8 is a schematic view showing a stirring process of the second capsule type adhesive by an anchor bolt, and FIG. 9 is a schematic view showing a tool removal process. be.

As shown in FIGS. 1 and 2, in step S11, a drilling hole 12 is drilled in the construction surface 11a of the existing foundation (reinforced concrete) 11 with a predetermined cutting tool. In step S12, the first capsule type adhesive 13 is inserted into the perforated hole 12. In this case, the dimension (outer diameter) of the first capsule type adhesive 13 is set according to the inner diameter of the drilled hole 12. As shown in FIGS. 1 and 3, the drive motor 14 has a socket 16 fixed to the drive shaft 15, and the anchor bolt 17 has a base end mounted on the socket 16. The anchor bolt 17 has a length longer than the depth of the drilled hole 12, a spiral groove 17a is formed on the outer peripheral surface thereof, and an inclined surface 17b is formed on the tip portion thereof. Therefore, the anchor bolt 17 is inserted into the drilled hole 12 while being rotated by the drive motor 14.

As shown in FIGS. 1 and 4, in step S13, the anchor bolt 17 is inserted into the perforated hole 12 while rotating, and the first capsule type adhesive 13 is stirred. Then, in the first capsule type adhesive 13, the aggregate, the resin material, and the curing agent are agitated by the inclined surface 17b of the anchor bolt 17, and the first capsule type adhesive 13 adheres to the inner wall surface of the perforated hole 12. When the first capsule type adhesive 13 is stirred by the anchor bolt 17 for a predetermined time, the anchor bolt 17 is pulled out from the drilled hole 12 in step S14 as shown in FIGS. 1 and 5. At this time, it is preferable to rotate the anchor bolt 17 in the direction opposite to that at the time of insertion and pull it out. Further, here, the curing of the agitated first capsule type adhesive 13 starts.

As shown in FIGS. 1 and 6, in step S15, the second capsule type adhesive 18 is inserted into the perforated hole 12. Generally, the dimension (outer diameter) of the second capsule type adhesive 18 is set according to the inner diameter of the drilled hole 12, but in the present embodiment, the dimension (outer diameter) of the second capsule type adhesive 18 is set. ) Is set according to the inner diameter smaller than the inner diameter of the drilled hole 12. That is, the second capsule type adhesive 18 has an outer diameter smaller than the outer diameter of the first capsule type adhesive 13. As shown in FIGS. 1 and 7, in step S16, the anchor bolt 17 is inserted into the perforated hole 12 while rotating, and the second capsule type adhesive 18 is stirred. Then, as shown in FIGS. 1 and 8, the second capsule type adhesive 18 is agitated by the inclined surface 17b of the anchor bolt 17 to agitate the aggregate, the resin material, and the curing agent, and adheres to the inner wall surface of the perforated hole 12. do. Further, the anchor bolt 17 stirs the second capsule type adhesive 18 and then stirs the first capsule type adhesive 13 which is being stirred and cured. Then, the first capsule type adhesive 13 and the second capsule type adhesive 18 fix the anchor bolt 17 to the perforated hole 12 by the anchoring effect.

That is, the first capsule type adhesive 13 and the second capsule type adhesive 18 are integrated by stirring the anchor bolt 17, and the resin is locked to the unevenness of the inner surface of the drilled hole 12, and the spiral groove 17a of the anchor bolt 17 is used. Locks to the unevenness of. After that, when the first capsule type adhesive 13 and the second capsule type adhesive 18 are stirred for a predetermined time by the anchor bolt 17, the rotation of the anchor bolt 17 by the motor 14 is stopped. Then, as shown in FIG. 1, in step S17, the tip of the anchor bolt 17 is held by the capsule adhesives 13 and 18 for a predetermined time, so that the first capsule adhesive 13 and the first capsule type adhesive 13 and 18 are held. The two-capsule adhesive 18 is cured. Then, when the first capsule type adhesive 13 and the second capsule type adhesive 18 are cured, the socket 16 is removed from the base end portion of the anchor bolt 17 in step S18 as shown in FIGS. 1 and 9.

Then, the anchor bolt 17 is fixed to the drilled hole 12 by the anchor portion 19 in which the first capsule type adhesive 13 and the second capsule type adhesive 18 are cured while the tip portion side is inserted into the drilled hole 12. Therefore, the anchor bolt 17 is fixed to the construction surface 11a of the foundation 11.

When the first capsule type adhesive 13 using the thermosetting resin is used, the curing starts from this time when the first capsule type adhesive 13 is stirred by the anchor bolt 17 in the perforated hole 12. Therefore, it is preferable to cool the first capsule type adhesive 13 in advance and insert the cooled first capsule type adhesive 13 into the perforated hole 12.

Further, in the above description, the first capsule type adhesive 13 and the second capsule type adhesive 18 are used, but the third capsule type adhesive may also be used. That is, the second capsule type adhesive 18 is stirred by the anchor bolt 17 to pull out the anchor bolt 17 from the drilled hole 12, then the third capsule type adhesive is inserted into the drilled hole 12, and the anchor bolt 17 is inserted into the drilled hole 12. The third capsule type adhesive, the second capsule type adhesive 18, and the first capsule type adhesive 13 are stirred while being inserted while rotating. Further, four or more capsule adhesives may be used.

As described above, in the method of constructing the adhesive anchor of the present embodiment, the step of inserting the first capsule type adhesive 12 into the drilling hole 12 of the construction surface 11a and the step of inserting the anchor bolt 17 into the drilling hole 12 while rotating the anchor bolt 17 The step of inserting and stirring the first capsule type adhesive 13, the step of pulling out the anchor bolt 17 from the drilled hole 12, the step of inserting the second capsule type adhesive 18 into the drilled hole 12, and the step of rotating the anchor bolt 17. While inserting into the perforated hole 12, the step of stirring the second capsule type adhesive 18 and the first capsule type adhesive 13 and the step of curing the first capsule type adhesive 13 and the second capsule type adhesive 18 are performed. have.

Therefore, first, only the first capsule type adhesive 13 in the drilled hole 12 is stirred by the anchor bolt 17, then the anchor bolt 17 is pulled out and the second capsule type adhesive 18 is inserted in the drilled hole 12. Then, the second capsule type adhesive 18 and the first capsule type adhesive 13 are stirred and cured in this order by the anchor bolt 17. Therefore, it is possible to secure a long buried length of the anchor bolt 17 for fixing the anchor bolt 17 with the cured adhesive, and it is possible to suppress an increase in the torque of the drive device for stirring the adhesive. .. As a result, it is possible to suppress the increase in size of the fixing portion of the support structure supported by the anchor bolt 17, and it is possible to suppress the increase in size of the drive device and suppress the increase in construction cost.

In the method of constructing the adhesive anchor of the present embodiment, the capacity of the second capsule type adhesive 18 is smaller than the capacity of the first capsule type adhesive 13. Therefore, the stirring time of the second capsule type adhesive 18 can be shortened, and the capsule type adhesives 13 and 18 can be stirred before the first capsule type adhesive 13 in the perforated hole 12 is cured. It is possible to form a fixing portion having sufficiently high strength.

In the method of constructing the adhesive anchor of the present embodiment, the outer diameter and the total length of the second capsule type adhesive 18 are smaller than the outer diameter and the total length of the first capsule type adhesive 13. Therefore, since the second capsule type adhesive 18 is formed by using the existing capsule type adhesive, it is possible to suppress an increase in component cost.

In the method of constructing the adhesive anchor of the present embodiment, when the anchor bolt 17 is pulled out from the drilled hole 12, the anchor bolt 17 is rotated in the direction opposite to that when the anchor bolt 17 is inserted into the drilled hole 12. Therefore, the anchor bolt 17 can be easily pulled out from the drilled hole 12, and the anchor bolt 17 and the agitated first capsule type adhesive 13 can be easily separated from each other.

In the method of constructing the adhesive anchor of the present embodiment, the cooled first capsule type adhesive 13 is inserted into the perforated hole 12. Therefore, by cooling the first capsule type adhesive 13 and inserting it into the perforated hole 12, the curing of the stirred first capsule type adhesive 13 can be delayed, and the second capsule type adhesive 18 is inserted. It is possible to suppress an increase in the torque of the drive device for stirring the subsequent capsule-type adhesives 13 and 18, and to improve the workability of the insertion work and the stirring work of the second capsule-type adhesive 18. can.

In the method of constructing the adhesive anchor of the present embodiment, the second capsule type adhesive 18 is stirred by the anchor bolt 17, the anchor bolt 17 is pulled out from the drilled hole 12, and then the third capsule type adhesive is inserted into the drilled hole 12. A step of inserting the anchor bolt 17 into the perforated hole 12 while rotating the anchor bolt 17 and stirring the third capsule type adhesive, the second capsule type adhesive 18, and the first capsule type adhesive 13 are provided. Therefore, by using the three capsule-type adhesives, the buried length of the anchor bolts for fixing the anchor bolts 17 can be further secured by the cured adhesive, and the support supported by the anchor bolts 17 can be secured. It is possible to suppress the increase in size of the fixing portion of the structure.

11 Foundation 11a Construction surface 12 Perforated hole 13 1st capsule type adhesive 14 Motor 15 Drive shaft 16 Socket 17 Anchor bolt 18 2nd capsule type adhesive 19 Anchor part

Claims (6)

The process of inserting the first capsule type adhesive into the perforated hole on the construction surface,
The step of inserting the anchor bolt into the perforated hole while rotating and stirring the first capsule type adhesive, and
The process of pulling out the anchor bolt from the drilled hole while rotating it,
The step of inserting the second capsule type adhesive into the perforated hole and
A step of inserting the anchor bolt into the perforated hole while rotating the anchor bolt to stir the second capsule type adhesive and the first capsule type adhesive.
The step of curing the first capsule type adhesive and the second capsule type adhesive, and
A method of constructing an adhesive anchor, which is characterized by having. The method for constructing an adhesive anchor according to claim 1, wherein the second capsule type adhesive has a capacity smaller than the capacity of the first capsule type adhesive. The method for constructing an adhesive anchor according to claim 2, wherein the second capsule type adhesive has an outer diameter and a total length smaller than the outer diameter and the total length of the first capsule type adhesive. The invention according to any one of claims 1 to 3, wherein when the anchor bolt is pulled out from the drilled hole while rotating , the anchor bolt is rotated in the direction opposite to that when the anchor bolt is inserted into the drilled hole. How to install the adhesive anchor. The method for constructing an adhesive anchor according to any one of claims 1 to 4, wherein the cooled first capsule type adhesive is inserted into the perforated hole. The step of inserting the third capsule type adhesive into the perforated hole after pulling out from the perforated hole while stirring the second capsule type adhesive with the anchor bolt and rotating the anchor bolt, and rotating the anchor bolt. Claim 1 to claim 1, wherein the step of inserting into the perforated hole and stirring the third capsule type adhesive, the second capsule type adhesive, and the first capsule type adhesive is provided. The method for constructing an adhesive anchor according to any one of 5.

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