JP6779564B2 - Core rod driving type anchor and its construction method - Google Patents

Description

The present invention involves a post-construction anchor that is drilled into a concrete skeleton afterwards and placed in the drilling, and in particular, a core that is fixed to the concrete skeleton by driving a core rod to expand the expanded portion of the main body. Regarding the rod driving type anchor and its construction method.

Conventionally, as a post-construction anchor, a core rod driving type anchor for driving a core rod to expand the expanded portion of the main body has been used. The core rod driving anchor is different from the sleeve driving anchor that expands by driving the expansion sleeve with a bottomed cylindrical dedicated driving rod, and it does not require a dedicated driving rod and is easy to install. It has the advantage that it can be constructed from above and the driving completion status can be visually confirmed, and there is a lot of demand.

An example of a conventional general core rod driving type anchor is shown in FIG. The core rod driving type anchor 10 of FIG. 7 is provided with a bolt portion 111 at the base end portion, and an expansion portion 113 having a slit 112 cut into the tip portion and divided into pieces, and is provided with a core rod insertion hole. The main body 11 on which the 114 is formed and the core rod 12 inserted into the core rod insertion hole 114 from the base end side are formed, and in the example of FIG. 7, the attachment 15 is formed by a nut 13 with a washer screwed into the bolt portion 111. It is configured to be fixed by sandwiching.

The core rod driving type anchor 10 is inserted into the perforation 141 formed in the concrete skeleton 14 so as to penetrate the attachment 15 in a state where the attachment 15 is arranged along the surface of the concrete skeleton 14. Then, the core rod 12 is driven with a hammer 16 and the tip portion of the core rod 12 is driven to the expansion portion 113 to expand the expansion portion 113 as shown by the thick line arrow in FIG. 7B. The expanded portion 113 is fixed by biting into the hole wall of the perforation 141 of the concrete skeleton 14 so as to be pressed against the hole wall, whereby the core rod driving anchor 10 and the attachment 15 are fixed to the concrete skeleton 14. In addition, Patent Document 1 discloses another example of a core rod driving type anchor.

JP-A-2015-232255

By the way, if a core rod driving type anchor is installed in a place where vibration is constantly generated, and after many years, there is a concern that the core rod 12 may come off as shown in FIG. 7 (c). To. When the core rod 12 is pulled out in this way, the expanding force of the main body 11 is reduced and it becomes difficult to maintain the expanded state of the expanded portion 113, and the expanded portion 113 is expanded as shown by the thick line arrow in the figure. Since it returns to the state before opening, there is a possibility that the core rod driving type anchor 10 itself may come off. Therefore, there is a demand for a core rod driving type anchor that can sustainably maintain the required pull-out strength and prevent the anchor itself from coming off while taking advantage of the construction of the core rod driving type anchor.

The present invention has been proposed in view of the above problems, and it is possible to take advantage of the construction of the core rod driving type anchor, maintain the required pull-out strength continuously, and prevent the anchor itself from coming off. It is an object of the present invention to provide a core rod driving type anchor that can be prevented and a method for constructing the anchor.

The core rod driving type anchor of the present invention has a bolt portion at the base end portion in the axial direction, an expansion portion having a slit cut at the tip portion and divided into pieces, and between the bolt portion and the expansion portion. The main body is provided with an intermediate portion and has substantially the same outer diameter over the entire length, and the core rod insertion hole is formed, and the core rod inserted into the core rod insertion hole from the base end side. An outer expansion portion having an outer diameter larger than that of the main body having substantially the same outer diameter over the entire length and having an outer slit cut in the tip portion and divided into pieces is provided. The outer sleeve is provided so that the outer expansion portion is arranged on the outer periphery of the expansion portion of the main body and is fitted onto the main body, and the base end which is the rear end of the base end portion of the outer sleeve is said. The outer sleeve is fitted onto the widened portion and the intermediate portion of the main body from the tip of the main body to the intermediate portion of the main body so as to be arranged near the root of the bolt portion of the main body. A small diameter for a core rod insertion hole, which is a space in which the outer sleeve and the main body are fixed and surrounded by a step portion protruding inward and the step portion and the inner end of the slit inside the widened portion of the main body. A portion is provided, and when the core rod enters the small diameter portion for inserting the core rod, both the expansion portion and the outer expansion portion are expanded so as to gradually expand the diameter toward the tip. It is a feature.
According to this, the advantages of the core rod driving type anchor, that it is easy to install without the need for a dedicated driving rod, it can be installed from the top of the attachment, and the driving completion status can be visually confirmed, are utilized. be able to. At the same time, by tightening the nut after expanding the expanded part of the main body, the outer expanded part of the outer sleeve can be expanded accordingly, and the outer expanded part can be pressed more strongly against the hole wall of the perforation to bite into it. By expanding the outer expansion portion via the expansion portion of the main body, for example, even if a force in the pull-out direction acts on the main body due to vibration, the expansion force of the outer sleeve does not decrease, and the required pull-out strength is required. Can be maintained continuously, and it is possible to prevent the anchor from coming off and the attachment attached by the anchor from falling as much as possible. In addition, by expanding the outer expansion portion via the expansion portion of the main body, there is a follow-up expansion effect in which the outer expansion portion further expands when a force in the pulling direction acts on the main body, so that the pull-out strength is obtained. The price itself will be dramatically higher. In addition, it has a simple structure that can be configured by simply fitting the outer sleeve to the existing core rod driving type anchor, and can be obtained at low cost. Further, by fixing the outer sleeve and the main body by, for example, welding, gluing, or caulking, it is possible to prevent the two from being separated from each other or being misaligned during transportation or driving into the perforation. ..

In the core rod driving type anchor of the present invention, the vicinity of the base end of the base end portion of the outer sleeve and the region near the root of the bolt portion of the main body or the intermediate portion are fixed by welding or an adhesive. It is characterized by being done .

The core rod driving type anchor of the present invention is characterized in that the outer sleeve and the main body are fixed by caulking with the outer sleeve deformed inward .

In the method of constructing the core rod driving type anchor of the present invention, the core rod driving type anchor of the present invention is inserted into a perforation formed in a concrete skeleton and arranged, and the core rod is driven into the inside of the expansion portion. The expanded portion was expanded so as to gradually expand the diameter toward the tip, and the outer expanded portion was expanded so as to gradually expand the diameter toward the tip by following the expanded portion. It is characterized by comprising a step of pressing the outer expansion portion against the hole wall of the perforation.
According to this, the effect of the core rod driving type anchor of the present invention can be surely obtained.

According to the present invention, it is possible to continuously maintain the required pull-out strength and prevent the anchor itself from coming off while taking advantage of the construction of the core rod driving type anchor. In addition, the pull-out strength of the anchor itself can be dramatically increased.

(A) is a perspective view of the core rod driving type anchor of the first embodiment according to the present invention, (b) is a front view thereof, (c) is a vertical sectional view thereof, and (d) is a first embodiment in an expanded state. Front view of the core rod driving type anchor. The exploded front view of the core rod driving type anchor of 1st Embodiment. (A) to (d) are explanatory views explaining the construction process of the core rod driving type anchor of 1st Embodiment. (A) is a front view of the core rod driving type anchor of the second embodiment according to the present invention, and (b) is a vertical sectional view thereof. The vertical sectional view of the core rod driving type anchor of 3rd Embodiment by this invention. The vertical sectional view of the core rod driving type anchor of 4th Embodiment by this invention. (A) to (b) are partial cross-sectional explanatory views explaining the construction process of the core rod driving type anchor of the conventional example, and (c) explain the state where the core rod is pulled out by the core rod driving type anchor of the conventional example. Partial cross-sectional explanatory view.

[Core rod driving type anchor of the first embodiment and its construction method]
The core rod driving type anchor 1 of the first embodiment according to the present invention is a metal post-installed anchor, and as shown in FIGS. 1 and 2, a bolt portion 21 is provided on the outer periphery of the base end portion. The main body 2 has a substantially cylindrical shape in which a slit 22 is cut into the tip portion from the tip end side and an expansion portion 23 divided into pieces is provided. In the illustrated example, four slits 22 are cut from the tip side at substantially equal intervals in the circumferential direction, and four expansion portions 23 are provided which are divided into pieces by the slits 22.

A core rod insertion hole 24 is formed inside the main body 2, and a step portion 231 projecting inward is provided inside the expansion portion 23, and is surrounded by the step portion 231 and the inner end of the slit 22. The space provided is a small diameter portion 241 of the core rod insertion hole 24. Further, a plurality of groove portions 232 having a substantially arc-shaped cross section are formed on the outer periphery of each of the expanded portions 23 so as to be separated in the longitudinal direction. A tubular intermediate portion 25 is formed between the bolt portion 21 and the expansion portion 23 in the axial direction of the main body 2.

The core rod 3 is inserted into the core rod insertion hole 24 from the base end side of the main body 2. The tip of the rod portion 31 of the core rod 3 has a substantially warhead shape, and is easily inserted into the small diameter portion 241 via the inclined rear end surface of the step portion 231 of the expansion portion 23. At the rear end of the rod portion 31, a head 32 having a diameter larger than that of the core rod insertion hole 24 and which cannot be inserted into the core rod insertion hole 24 is provided. A nut is screwed into the bolt portion 21 of the main body 2. The nut in the illustrated example is a nut 4 with a washer in which a washer 41 is integrally provided.

Further, the core rod driving type anchor 1 has a substantially cylindrical outer sleeve 5 which is formed with substantially the same wall thickness as a whole. The outer sleeve 5 is provided with an outer expanding portion 52 in which an outer slit 51 is cut into the tip portion from the tip end side and divided into pieces. In the illustrated example, four outer slits 51 are cut at substantially equal intervals in the circumferential direction from the tip side, and four outer expansion portions 52 are provided which are divided into pieces by the outer slits 51. .. Further, a plurality of groove portions 521 having a substantially V-shaped cross section are formed on the outer periphery of each outer expanding portion 52 so as to be separated in the longitudinal direction.

The outer sleeve 5 is fitted onto the main body 2 so that the outer expanding portion 52 is arranged on the outer periphery of the expanding portion 23 of the main body 2. In the illustrated example, each outer expanding portion 52 is arranged so as to overlap and be close to the outside of each expanding portion 23, and each outer slit 51 is located at a position corresponding to each slit 22 of the main body 2. Have been placed.

In the outer sleeve 5 outerly fitted to the main body 2 in the first embodiment, the base end, which is the rear end of the base end portion 53, is arranged near the root of the bolt portion 21 of the main body 2, and is located near the base end of the outer sleeve 5. The area near the root of the bolt portion 21 or the intermediate portion 25 is fixed to the main body 2 by welding or adhesive fixing with the adhesive portion 6. The adhesive portions 6 are provided at a plurality of locations at intervals in the circumferential direction, and the outer sleeve 5 and the main body 2 are fixed by spot welding or spot welding of the adhesive portions 6. When the outer sleeve 5 and the main body 2 are welded or bonded to be fixed, the welding or bonding location and the welding or bonding method are appropriate.

When constructing the core rod driving type anchor 1 of the first embodiment, as shown in FIG. 3A, a perforation 71 having a predetermined depth was formed in the concrete skeleton 7, and the inside of the perforation 71 was cleaned. After that, an attachment 8 such as an attachment plate having a through hole 81 is arranged along the surface of the concrete skeleton 7 so that the position of the through hole 81 is aligned with the perforation 71.

After that, the position of the washer 41 from the tip of the core rod driving type anchor 1 is set to the position of the embedding depth L1 of the core rod driving type anchor 1 + the thickness L2 of the attachment 7, and the bolt of the nut 4 with the washer The screwing position in the portion 21 is adjusted, and in that state, the core rod driving type anchor 1 is inserted into the through hole 81 and the hole 71. After insertion, the washer 41 of the nut 4 with washer is in contact with or close to the outer surface of the attachment 8 (see FIGS. 3 (b) and 3 (c)).

Further, as shown in FIG. 3C, the core rod 2 of the core rod driving type anchor 1 inserted and arranged in the perforation 71 is driven by a hammer 9, so that the core rod 2 is inside the expansion portion 23. Drive up to the small diameter part 241. When the core rod 2 is driven to the small diameter portion 241, the step portion 231 is pushed outward to expand the expanding portion 23 of the main body 2, and the expanding portion 23 pushes outward to expand the expanding portion 23. The outer expansion portion 52 is expanded so as to follow the expansion of the 23. The expanded outer expansion portion 52 is pressed against the hole wall of the perforation 71, bites into the hole wall, and is fixed (see FIG. 3D).

After that, the nut 4 with a washer screwed into the bolt portion 21 is tightened so that the washer 41 of the nut 4 with a washer comes into close contact with the outer surface of the attachment 8, and the driving of the core rod driving type anchor 1 is completed ( See FIG. 3 (d)). In this state, as shown by the thick arrow in FIG. 3D, a force acts on the main body 2 in the direction of pulling the nut 4 with a washer, and the main body 2 is pulled toward the root side of the driven core rod 2. It will be. As a result, the expanding force (see the thick line arrow in FIG. 3D) that opens the expanding portion 23 of the main body 2 and the outer expanding portion 52 of the outer sleeve 5 to the outside is strengthened, and the core rod driving type anchor 1 is attached. The object 8 has high strength and is fixed to the concrete skeleton 7.

Then, when a force in the pull-out direction acts on the main body 2 due to the vibration of the attachment 8 in a place where there is a lot of vibration, the expanding portion 23 of the main body 2 acts a force to further expand the outer expanding portion 52. As a result, the outer sleeve 5 is subsequently expanded, and the outer expansion portion 52 further bites into the hole wall of the perforation 71 of the concrete skeleton 7. Then, a force acts so that the core rod 3 is pressed from the outside to the inside by both the outer expanding portion 52 fixed to prevent it from coming off and the expanding portion 23 of the main body 2, and a state in which it is extremely difficult to come out is maintained. As a result, the expanding force of the outer expanding portion 52 is not reduced even in an environment where there is constant vibration, and the firmly fixed state of the anchor 1 is well maintained for a long period of time.

According to the first embodiment, the core rod driving anchor 1 is constructed so that a dedicated driving rod is not required and the construction is easy, the construction can be performed from above the attachment 8, and the driving completion state can be visually confirmed. You can take advantage of the above benefits. At the same time, by tightening the nut after expanding the expanded part of the main body, the outer expanded part of the outer sleeve can be expanded accordingly, and the outer expanded part can be pressed more strongly against the hole wall of the perforation to bite into it. By expanding the outer expansion portion via the expansion portion of the main body, for example, even if a force in the pull-out direction acts on the main body due to vibration, the expansion force of the outer sleeve does not decrease, and the required pull-out strength is required. Can be maintained continuously, and it is possible to prevent the anchor from coming off and the attachment attached by the anchor from falling as much as possible. In addition, by expanding the outer expansion portion via the expansion portion of the main body, there is a follow-up expansion effect in which the outer expansion portion further expands when a force in the pulling direction acts on the main body, so that the pull-out strength is obtained. The price itself will be dramatically higher. Therefore, when the existing core rod driving type anchor is installed upward on the ceiling or the like, there is a concern that the expanding force may decrease due to the core rod coming out, but this concern is also resolved.

Further, it has a simple structure that can be configured only by externally fitting the outer sleeve 5 to the existing core rod driving type anchor 1, and can be obtained at low cost. Further, by fixing the outer sleeve 5 and the main body 2, it is possible to prevent the two from being separated from each other or being displaced from each other during transportation or during driving into the perforation 71.

[Core rod driving type anchor of the second embodiment and its construction method]
The core rod driving type anchor 1a of the second embodiment according to the present invention has a configuration in which the main body 2a and the outer sleeve 5a are fixed by caulking instead of the configuration in which the main body 2 and the outer sleeve 5 are fixed by the adhesive portion 6 in the first embodiment. It was done. In the example of FIG. 4, the caulking portion 54a is formed by being deformed so as to be pushed inward at the substantially central portion on the front side and the substantially central portion on the back side of the base end portion 53a of the outer sleeve 5a. The portion 54a is crimped and fixed by being pushed into the intermediate portion 25a of the main body 2a so as to bite into the intermediate portion 25a.

Other configurations of the core rod driving type anchor 1a of the second embodiment are the same as those of the first embodiment, and the core rod driving type anchor 1a can be constructed by the same construction process as that of the first embodiment. Is. Then, the same effect as that of the first embodiment can be obtained by the second embodiment.

[Core rod driving type anchor of the third embodiment and its construction method]
In the core rod driving type anchor 1b of the third embodiment according to the present invention, instead of the configuration in which the main body 2 and the outer sleeve 5 are fixed by the adhesive portion 6 in the first embodiment, the tip of the main body 2b is used as shown in FIG. An overhanging portion 26b extending forward from the tip of the outer sleeve 5 and extending outward in a substantially trumpet shape is provided at the tip of the main body 2b as a misalignment prevention portion. The overhanging portion 26b regulates the relative movement of the outer sleeve 5 with respect to the main body 2b, and prevents misalignment.

Other configurations of the core rod driving type anchor 1b of the third embodiment are the same as those of the first embodiment, and the core rod driving type anchor 1b can be constructed by the same construction process as that of the first embodiment. Is. Then, according to the third embodiment, it is possible to prevent the outer sleeve 5 and the main body 2b from being displaced during the construction, and it is possible to obtain the corresponding effect from the configuration corresponding to the first embodiment.

[Core rod driving type anchor of the fourth embodiment and its construction method]
In the core rod driving type anchor 1c of the fourth embodiment according to the present invention, instead of the configuration in which the main body 2 and the outer sleeve 5 are fixed by the adhesive portion 6 in the first embodiment, the tip of the outer sleeve 5c is as shown in FIG. Is extended forward from the tip of the main body 2, and an overhanging portion 55c that bends inward is provided at the tip of the outer sleeve 5c as a misalignment prevention portion. The overhanging portion 55c regulates the relative movement of the outer sleeve 5c with respect to the main body 2 and prevents misalignment.

Other configurations of the core rod driving type anchor 1c of the fourth embodiment are the same as those of the first embodiment, and the core rod driving type anchor 1c can be constructed by the same construction process as that of the first embodiment. Is. Then, according to the fourth embodiment, it is possible to prevent the outer sleeve 5c and the main body 2 from being displaced during the construction, and it is possible to obtain the corresponding effect from the configuration corresponding to the first embodiment.

[Modified examples of embodiments]
The invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification to the extent applicable, in addition to each invention and each embodiment, or these. It includes a configuration specified by adding other configurations disclosed in the present specification, or a super-conceptualized configuration specified by deleting these partial configurations to the extent that a partial effect can be obtained. , Also includes the following modifications.

For example, in the core rod driving type anchor of the present invention, the fixing location and the fixing method when fixing the main body and the outer sleeve are appropriate other than the first and second embodiments. Further, the misalignment prevention portion is appropriate in addition to the third and fourth embodiments as long as it can regulate the relative movement of the main body and the outer sleeve. Further, it is also possible to provide a misalignment prevention portion and fix the outer sleeve and the main body, for example, by additionally providing the adhesive portion 6 in the configurations of the third and fourth embodiments. It is possible to prevent the two from separating or causing misalignment during driving into the inside or inside the perforation, and even if the outer sleeve and the main body are disconnected, the outer sleeve and the main body can be installed. It is possible to prevent the inside from shifting.

Further, in the core rod driving type anchor of the present invention, the positional relationship between the single-shaped expansion portion and slit of the main body and the single-shaped outer expansion portion and outer slit of the same number of outer sleeves is the expansion portion-. The outer expansion portion corresponds to the position, and the slit-outer slit does not limit the corresponding positional relationship. For example, the outer expansion portion may be arranged so as to straddle the slit of the main body. Further, it is possible to configure the number of the piece-shaped outer expansion portion and the slit of the main body to be different from the number of the piece-shaped outer expansion part and the outer slit of the outer sleeve.

The present invention can be used, for example, when a core rod driving type post-construction anchor is driven into a concrete skeleton and an attachment is attached to the concrete skeleton.

1, 1a, 1b, 1c ... Core rod driving type anchor 2, 2a, 2b ... Main body 21 ... Bolt part 22 ... Slit 23 ... Expansion part 231 ... Step part 232 ... Groove part 24 ... Core rod insertion hole 241 ... Small diameter part 25 , 25a ... Intermediate part 26b ... Overhanging part 3 ... Core rod 31 ... Rod part 32 ... Head 4 ... Nut with washer 41 ... Washer 5, 5a, 5c ... Outer sleeve 51 ... Outer slit 52 ... Outer expansion part 521 ... Grooves 53, 53a ... Base end 54a ... Caulking 55c ... Overhang 6 ... Adhesive 7 ... Concrete skeleton 71 ... Drilling 8 ... Attachment 81 ... Through hole 9 ... Hammer L1 ... Core rod driving anchor embedding depth L2 ... Thickness of attachment 10 ... Core rod driving anchor 11 ... Main body 111 ... Bolt part 112 ... Slit 113 ... Expansion part 114 ... Core rod insertion hole 12 ... Core rod 13 ... Nut with washer 14 ... Concrete skeleton 141 ... Perforation 15 ... Attachment 16 ... Hammer

Claims (4)

A bolt portion is provided at the base end portion in the axial direction, an expansion portion is divided into pieces by cutting a slit at the tip portion, and an intermediate portion is provided between the bolt portion and the expansion portion over the entire length. The main body, which is formed with substantially the same outer diameter and has a core rod insertion hole,
The core rod inserted into the core rod insertion hole from the base end side and
An outer expanding portion having an outer diameter larger than that of the main body having substantially the same outer diameter over the entire length and having an outer slit cut in the tip portion and divided into pieces is provided. An outer sleeve is provided so that the outer expansion portion is arranged on the outer periphery of the expansion portion of the main body and is fitted onto the main body.
The outer sleeve extends from the tip of the main body to the intermediate portion of the main body so that the base end, which is the rear end of the base end portion of the outer sleeve, is arranged near the root of the bolt portion of the main body. Externally fitted to the expanded portion and the intermediate portion of the main body,
The outer sleeve and the main body are fixed,
Inside the expanded portion of the main body, a step portion protruding inward and a small diameter portion for a core rod insertion hole, which is a space surrounded by the step portion and the inner end of the slit, are provided.
The core rod is characterized in that both the expansion portion and the outer expansion portion are gradually expanded toward the tip by the insertion of the core rod into the small diameter portion for inserting the core rod. Drive-in anchor. The claim is characterized in that a region near the base end of the base end portion of the outer sleeve and a region near the root of the bolt portion of the main body or the intermediate portion are fixed by welding or an adhesive. The core rod driving type anchor according to 1. The core rod driving type anchor according to claim 1, wherein the outer sleeve and the main body are fixed by caulking fixing the outer sleeve deformed inward . The core rod driving type anchor according to any one of claims 1 to 3 is inserted into the perforation formed in the concrete skeleton and arranged, and the core rod is driven into the inside of the expanding portion to tip the expanding portion. The outer expanding portion is expanded so as to gradually expand the diameter toward the tip, and the outer expanding portion is expanded so as to gradually expand the diameter toward the tip, and the outer expanding portion is expanded so as to follow the expanded portion. A method for constructing a core rod driving type anchor, which comprises a step of pressing against the hole wall of the perforation.

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