JP2021147813A - Anchor material and construction method for hole-in anchor - Google Patents

Abstract

To provide a hole-in-anchor which can be constructed in a relatively easy manner and which can perform filling with a filling material more reliably, and a construction method for the hole-in anchor.SOLUTION: Provided is a hole-in anchor 1, comprising an anchor material 5 to be inserted within an anchor hole 4 formed in a concrete member, and a filling material 6 for filling a gap between the anchor hole 4 and the anchor material 5. The anchor material 5 is composed of a steel pipe having a length greater than a depth of the anchor hole 4, and a groove 51 penetrating the inside/outside the steel pipe is formed on a tip plane of the anchor material 5.SELECTED DRAWING: Figure 2

Description

The present invention relates to an anchor material to be installed in a concrete structure and a method of constructing a post-installed anchor.

Post-installed anchors may be installed as joint members when seismic retrofitting or repairing existing concrete structures is performed, incidental equipment is added, or new structures are added. Post-installed Anchor construction is performed by forming an anchor hole in the existing concrete structure and fixing the anchor material inserted in the anchor hole in the anchor hole.

As a method of constructing such a post-installed anchor, Patent Document 1 describes that an anchor material having an outer expansion sleeve inserted into an anchor hole and the rear end of the anchor material is impacted to expand the expansion sleeve. A method of fixing the enlarged diameter sleeve to the inner wall of the anchor hole is disclosed.

Further, in Patent Document 2, after filling the anchor hole in which the concrete member is formed, the anchor bar is inserted into the anchor hole, and the filling material is solidified to fix the anchor bar. The construction method is disclosed.

Further, Patent Document 3 discloses a method of constructing a post-installed anchor in which an anchor material is inserted into an anchor hole formed in a concrete member and then a filler is filled in the anchor hole. In the post-installed anchor construction method of Patent Document 3, an exhaust pipe is piped in the anchor hole so as to abut on the upper surface of the anchor hole, and the filler is injected while exhausting the air in the anchor hole by this exhaust pipe. doing.

JP-A-2019-127733 JP-A-2019-163668 Japanese Unexamined Patent Publication No. 2014-001495

In the post-installed anchor of Patent Document 1, although the expanded portion of the diameter-expanding sleeve is locked to the hole wall of the anchor hole, a gap is formed between the anchor material and the anchor hole in other portions. .. Therefore, the anchor material may loosen due to the influence of vibration or the like.

Further, in the post-installed anchor of Patent Document 2, for the anchor holes facing upward or sideways, the filler may flow out from the anchor holes between the time when the filler is injected into the anchor holes and the time when the anchor bars are inserted. Therefore, it is necessary to carry out the construction carefully.

Further, in the post-installed anchor of Patent Document 3, in order to pipe an injection pipe for injecting a filler in addition to the anchor material in the anchor hole, it is necessary to form the anchor hole larger than the anchor material. There is. Therefore, it takes time and effort to drill an anchor hole and inject a filler.

An object of the present invention is to propose a method of constructing an anchor material and a post-installed anchor that can be constructed relatively easily and that can fill the filler more reliably.

The anchor material of the present invention for solving the above-mentioned problems is an anchor material that is inserted into an anchor hole formed in a concrete member and fixed in the anchor hole by a filler filled in the anchor hole. Therefore, it is made of a steel pipe having a length larger than the depth of the anchor hole, and an injection port penetrating the inside and outside of the steel pipe is formed at the tip end portion.

Further, the post-installed anchor construction method of the present invention uses the anchor material, and includes a drilling step of drilling a concrete member to form an anchor hole and inserting the anchor material into the anchor hole. It is provided with an anchor material disposing step and an injection step of injecting a filler into the anchor hole. In the injection step, the filler pumped through the anchor material is injected into the anchor hole from the injection port in a state where the tip surface of the anchor material is in contact with the bottom surface of the anchor hole.

According to the method of constructing an anchor material and a post-installed anchor of the present invention, since the anchor material is formed of a steel pipe, the anchor material can be used as an injection pipe for a filler. Further, since it is not necessary to separately pipe the injection pipe, the anchor hole can be formed in a size corresponding to the shape of the anchor material, which is excellent in workability. Further, since the injection port is formed at the tip of the anchor material, the filler can be injected from the tip of the anchor material with the tip of the anchor material in contact with the bottom surface of the anchor hole. .. That is, by injecting the filler from the bottom of the anchor hole, the filler can be filled more reliably.

If the injection port is a groove that opens on the end face, the filler can be injected from the bottom surface of the anchor hole, and the filling property of the filler is further improved.
Further, if a male screw is formed at the base end portion of the anchor material, it becomes easy to attach a new member to the anchor material.
Further, if the outer surface of the anchor material is uneven, the fixability with the filler is improved.

Further, in the anchor material disposing step, the exhaust pipe is inserted so that the tip is located at the bottom of the anchor hole, and in the injection step, the air in the anchor hole is sucked by the exhaust pipe, and the exhaust pipe is used. If the injection of the filler is stopped at the stage when the filler is sucked by the filler, the filling property of the filler is further improved.
Further, in the process of arranging the anchor material, if the opening of the anchor hole is shielded by the lid material, the outflow of the filler can be suppressed.

According to the method of constructing the anchor material and the post-installed anchor of the present invention, the workability is improved and the filler can be filled more reliably.

It is the schematic which shows the use situation of the post-installed anchor which concerns on embodiment of this invention. It is sectional drawing which shows the post-installed anchor. It is a perspective view which shows the anchor material. It is a figure which shows the construction method of the post-installed anchor, (a) is a hole drilling process, (b) is an anchor material arrangement process, (c) is an injection process. (A) and (b) are perspective views which show the anchor material which concerns on other forms. (A) and (b) are perspective views which show the anchor material which concerns on other forms.

In the present embodiment, a case where the bridge collapse prevention member 3 is installed on the concrete bridge girder 2 as a part of seismic reinforcement of the concrete bridge girder (concrete member) 2 of the existing bridge 20 will be described. As shown in FIG. 1, the bridge collapse prevention member 3 is fixed to the concrete bridge girder 2 by post-installed anchors 1. The bridge collapse prevention member 3 of the present embodiment is a so-called steel bracket, and the mounting plate 31 attached to the lower surface of the concrete bridge girder 2 and the end of the mounting plate 31 at the corners of the concrete bridge girder 2 and the pier 21. A vertical plate 32 extending downward from the portion and a rib material 33 fixed to the mounting plate 31 and the vertical plate 32 so as to be perpendicular to the mounting plate 31 and the vertical plate 32 are provided. The bridge collapse prevention member 3 is fixed to the lower surface of the concrete bridge girder 2 by fixing the mounting plate 31 to the base end portion of the post-installed anchor 1 protruding from the lower surface of the concrete bridge girder 2.

First, the post-installed anchor 1 will be described after the present embodiment. As shown in FIG. 2, the post-installed anchor 1 is installed upward (for example, vertically) from the lower surface of the concrete bridge girder (concrete member) 2. The orientation of the post-installed anchor 1 may be appropriately determined according to the purpose of use and the installation location, and is not limited to the upward direction (vertical direction).

The post-installed anchor 1 is composed of an anchor material 5 inserted into the anchor hole 4 formed in the concrete bridge girder 2 and a filler 6 filled in the gap between the anchor hole 4 and the anchor material 5. Non-shrink mortar is used for the filler 6. The material constituting the filler 6 is not limited to non-shrink mortar as long as the anchor material 5 can be fixed in the anchor hole 4, and may be, for example, concrete or resin. It may be a solidifying material made of.

The anchor material 5 is made of a steel pipe having a length larger than the depth of the anchor hole 4. As shown in FIG. 2, the steel pipe constituting the anchor material 5 has a cylindrical shape and has sufficient strength as a fixing member for the bridge collapse prevention member 3. The cross-sectional shape of the steel pipe constituting the anchor material 5 is not limited to a circle, and may be, for example, a square or other polygon. As shown in FIG. 3, a male screw 52 for attaching the bridge collapse prevention member 3 is formed at the base end portion (lower end portion in FIG. 2) of the anchor member 5. The male screw 52 is formed at a portion (base end portion of the anchor material 5) protruding from the anchor hole 4 when the anchor material 5 is arranged in the anchor hole 4. The male screw 52 may be formed as needed.

A groove 51 having a rectangular cross section is formed on the tip surface (upper end surface in FIG. 2) of the anchor material 5 so as to penetrate the inside and outside of the steel pipe (in the diameter direction). In the present embodiment, the four grooves 51 are formed at equal intervals in the circumferential direction of the steel pipe. The groove 51 functions as an injection port 51 when the filler 6 is injected into the anchor hole 4. The cross-sectional shape, width, and depth of the groove 51 are not limited as long as they do not obstruct the flow of the filler 6, and are, for example, U-shaped, semicircular, or triangular. May be good. Further, the number and arrangement of the grooves 51 are not limited, and may be appropriately determined according to the size and shape of the steel pipe (anchor material 5).

Next, the construction method of the post-installed anchor 1 will be described. Post-installed Anchor 1 is constructed by a drilling step, an anchor material disposing step, an injection step, and a lid removing step.
As shown in FIG. 4A, the drilling step is a step of drilling the concrete bridge girder 2 to form the anchor hole 4. The anchor hole 4 of the present embodiment is formed upward from the lower surface of the concrete bridge girder 2. The anchor hole 4 has a columnar shape having an inner diameter larger than the outer diameter of the anchor material 5. The depth of the anchor hole 4 is set to a length that can secure the fixing length of the anchor material 5. Further, the shape of the anchor hole 4 is not limited to a columnar shape, and may be, for example, a polygonal shape, or may have a diameter-expanded portion at the tip portion or the like. After forming the anchor hole 4, it is desirable to clean the inside of the anchor hole 4 to remove concrete pieces and the like remaining in the anchor hole 4.

The anchor material disposing step is a step of inserting the anchor material 5 into the anchor hole 4 as shown in FIG. 4 (b). The tip surface of the anchor material 5 is brought into contact with the bottom surface (upper end) of the anchor hole 4. At this time, the base end portion (male screw 52) of the anchor material 5 protrudes from the hole opening of the anchor hole 4.

In the anchor material disposing step, the exhaust pipe 7 is inserted into the anchor hole 4 together with the anchor material 5. The exhaust pipe 7 is piped so that the tip is located on the bottom surface (upper end) of the anchor hole 4. At this time, it is desirable that the exhaust pipe 7 is piped so that the tip end abuts on the bottom surface (upper end) of the anchor hole 4. The exhaust pipe 7 is made of a resin tube and has an outer diameter smaller than that of the anchor material 5. Further, the length of the exhaust pipe 7 is larger than the depth of the anchor hole 4, and the base end portion of the exhaust pipe 7 extends from the hole opening of the anchor hole 4 and is connected to the vacuum pump P1. The material constituting the exhaust pipe 7 is not limited, and may be, for example, a vinyl chloride pipe, a steel pipe, or the like. The anchor material 5 and the exhaust pipe 7 may be individually inserted into the anchor hole 4, or may be inserted into the anchor hole 4 with the exhaust pipe 7 attached to the anchor material 5.

After the anchor material 5 and the exhaust pipe 7 are inserted into the anchor hole 4, the hole opening of the anchor hole 4 is shielded by the lid material 8. The lid material 8 is formed with a through hole 81 for inserting the anchor material 5 and the exhaust pipe 7, and the concrete bridge girder 2 has the anchor material 5 and the exhaust pipe 7 inserted through the through hole 81. Temporarily fix it to the bottom surface. The method of fixing the lid material 8 to the concrete bridge girder 2 is not limited, and for example, a screw 82 penetrating the lid material 8 may be fastened to the periphery of the anchor hole 4. The lid material 8 functions as a mold when filling the filler 6. The lid material 8 also functions as a temporary fixing member for the anchor material 5 and the exhaust pipe 7. The anchor material 5 and the exhaust pipe 7 may be temporarily fixed by a jig provided separately from the lid material 8.

The injection step is a step of injecting the filler 6 into the anchor hole 4 as shown in FIG. 4 (c). The anchor material 5 is used for injecting the filler 6 into the anchor hole 4. That is, the transport pipe 61 extended from the injection pump P2 is connected to the anchor material 5, and the filler 6 pumped by the injection pump P2 via the transport pipe 61 is injected from the anchor material 5 into the anchor hole 4. .. The filler 6 pumped through the anchor material 5 is discharged from the groove (injection port) 51 into the anchor hole 4. The filler 6 falls on the hole opening side (on the lid material 8) in the anchor hole 4 and rises from the lower side (hole opening side) of the anchor hole 4. When the post-installed anchor 1 is oriented sideways or downward, the filler 6 is filled from the bottom of the anchor hole 4.

In the injection step, the air in the anchor hole 4 is sucked by the exhaust pipe 7 as the filler 6 is injected. By sucking air into the anchor hole 4 by the exhaust pipe 7, it becomes difficult for air to remain at the upper end of the anchor hole 4, and an air pool (unfilled portion) is formed at the upper end of the anchor hole 4. Suppression or minimizing the air pool formed at the upper end of the anchor hole 4.

At the stage where the upper surface of the injected filler 6 rises to the upper end of the anchor hole 4 and the filler 6 is sucked by the exhaust pipe 7 (the stage where the filler 6 is discharged from the base end of the exhaust pipe 7). Stop the injection of the filler 6. When the injection of the filler 6 is stopped, the intake air by the exhaust pipe 7 is stopped. The exhaust pipe 7 shields the air from flowing back and being sent into the anchor hole 4. Further, the base end portion of the anchor material 5 is also shielded as needed.

The lid removing step is a step of removing the lid material 8 after curing the filler 6. With the removal of the lid material 8, the exhaust pipe 7 is cut at the surface of the concrete bridge girder 2.
After removing the lid material 8, the bridge collapse prevention member 3 is installed by using the anchor material 5. The bridge collapse prevention member 3 is fixed by screwing a nut to the male screw 52 of the anchor material 5 in a state where the anchor material 5 is inserted into the through hole formed in the mounting plate 31.

According to the post-installed anchor 1 (anchor material 5) and the post-installed anchor 1 construction method of the present embodiment, since the anchor material 5 is formed of a steel pipe, the anchor material 5 is used as an injection pipe for the filler 6. be able to. Therefore, it is not necessary to pipe an injection pipe in the anchor hole 4 separately from the anchor material 5, and the workability is excellent. Further, since it is not necessary to pipe an injection pipe in the anchor hole 4 in addition to the anchor material 5, the anchor hole 4 can be formed in a size corresponding to the shape of the anchor material 5.

Further, since the groove 51 is formed on the tip surface of the anchor material 5, the filler 6 can be injected with the tip of the anchor material 5 in contact with the bottom surface of the anchor hole 4. By injecting the filler 6 from the bottom of the anchor hole 4, the filler 6 can be filled more reliably. That is, the filler 6 is formed along the bottom surface of the anchor hole 4 from the groove 51 formed at the tip of the anchor material 5 without providing a gap between the tip of the anchor material 5 (injection pipe) and the bottom surface of the anchor hole 4. Is injected to prevent the formation of unfilled portions at the bottom (upper end) of the anchor hole 4.

Further, since the filler 6 is injected while exhausting from the upper part of the anchor hole 4 by the exhaust pipe 7, air is unlikely to remain in the anchor hole 4. Therefore, it is difficult for a gap to be formed between the post-installed anchor 1 and the concrete member, and high-quality construction is possible.

The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and each of the above-mentioned components can be appropriately modified without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the bridge collapse prevention member 3 is fixed to the existing bridge 20 by using the post-installed anchor 1 has been described, but the use of the post-installed anchor 1 is not limited. Further, the concrete member on which the post-installed anchor 1 is installed is not limited to the concrete bridge girder 2.

Further, in the above-described embodiment, the male screw 52 is formed at the base end portion of the anchor material 5, but the male screw 52 may be formed as needed. For example, when a new concrete member is attached to an existing concrete member, or when the base end portion of the anchor material 5 is embedded in the concrete member with a predetermined fixing length secured, the male screw 52 needs to be formed. There is no.

Further, as shown in FIGS. 5A and 5B, unevenness may be formed on the outer surface of the anchor material 5. If the outer surface of the anchor material 5 is uneven, the pull-out resistance is improved. As the unevenness of the anchor material 5, for example, as shown in FIG. 5A, a fushi 53 such as a deformed reinforcing bar may be formed, or as shown in FIG. 5B, a spiral ridge may be formed. 54 may be formed.

Further, in the above embodiment, the case where the anchor material 5 is formed with a groove-shaped injection port (groove) 51 that opens at the end face, but the shape of the injection port 51 is not limited, for example. , As shown in FIG. 6A, it may be a through hole formed so as to penetrate the inside and outside of the anchor material 5 at the tip end portion of the anchor material 5. At this time, the shape of the injection port 51 is not limited, and may be rectangular, circular, oval, or the like. Further, the injection port 51 may be formed in a plurality of stages at the tip end portion of the anchor material 5. At this time, the injection port 51 may include a groove 51 formed in the end surface of the anchor material 5 and a through hole formed in the end portion of the anchor material 5 (see FIG. 6B).

Further, the exhaust pipe 7 may be piped as needed.
Further, the lid material 8 may be used as needed. For example, when the filler 6 has a high viscosity and the filler 6 does not flow out from the anchor hole 4, the lid material 8 may be omitted.

1 Post-installed anchor 2 Concrete bridge girder (concrete member)
4 Anchor hole 5 Anchor material 51 Groove (injection port)
52 Male screw 6 Filler 7 Exhaust pipe
8 Closure material

Claims (7)

An anchor material that is inserted into an anchor hole formed in a concrete member and fixed in the anchor hole by a filler filled in the anchor hole.
It consists of a steel pipe with a length greater than the depth of the anchor hole.
An anchor material characterized in that an injection port penetrating the inside and outside of the steel pipe is formed at the tip portion. The anchor material according to claim 1, wherein the injection port is a groove that opens at the end face. The anchor material according to claim 1 or 2, wherein a male screw is formed at the base end portion. The anchor material according to any one of claims 1 to 3, wherein the outer surface is formed with irregularities. A method for constructing post-installed anchors using the anchor material according to any one of claims 1 to 4.
The drilling process to drill holes in concrete members to form anchor holes,
Anchor material disposing step of inserting the anchor material into the anchor hole, and
An injection step of injecting a filler into the anchor hole is provided.
In the injection step, the filling material pumped through the anchor material is injected into the anchor hole from the injection port in a state where the tip surface of the anchor material is in contact with the bottom surface of the anchor hole. Post-installed anchor construction method featuring. In the anchor material disposing step, the exhaust pipe is inserted so that the tip is located at the bottom of the anchor hole.
The fifth aspect of the present invention, wherein in the injection step, the air in the anchor hole is sucked by the exhaust pipe, and the injection of the filler is stopped at the stage when the filler is sucked by the exhaust pipe. Construction Anchor construction method. The method for constructing a post-installed anchor according to claim 5 or 6, wherein in the anchor material disposing step, the hole opening of the anchor hole is shielded by a lid material.

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