JP2024029992A - Flammed anchor bolt and post-installation anchor construction method using it - Google Patents

Abstract

[Problem] It can exhibit much stronger tensile strength and pullout strength than conventional ones, does not cause misalignment when installed vertically, horizontally, or diagonally, does not require the anchor installation hole to be very deep, and is To provide a simple anchor bolt with a flange, which does not damage objects, etc., and can be manufactured easily and inexpensively. [Solution] A flanged anchor bolt 1 is inserted into an anchor installation hole 10, embedded in a fixing material 11 filled in the anchor installation hole 10, and is used for fixing, and includes at least the bolt head. A rod-shaped bolt part 4 having a male thread on the side surface near the anchor hole 10 and having a length such that the bolt tip side 5 can be exposed from the anchor installation hole 10, and a threaded hole 6 having a female thread to be screwed into the male thread. is provided in the middle, expands from the vicinity of the bolt head, has a smaller diameter than the anchor installation hole 10, and is embedded and fixed together with the bolt head in the fixing material 11 within the anchor installation hole 10. It has a head flange part 2. [Selection diagram] Figure 1

Description

The present invention relates to an anchor bolt with a flange, such as a reinforcing bar or various anchor elements, and a post-installation anchor that is used by fixing the bolt to a concrete frame or bedrock such as a culvert, a dam body, or a building. Regarding construction methods.

In order to increase the seismic strength and durability of existing concrete structures such as culverts, dam embankments, tunnels, and buildings, reinforcement work is being carried out to improve the shear strength. Further, installation work is being carried out in which other building materials are connected to these buildings or structures, or during construction thereof, or to the building materials as an afterthought. Alternatively, work is being carried out to attach structures such as rockfall protection nets and avalanche prevention fences as necessary to so-called stretched concrete, which covers the slope of the ground and rock to prevent it from collapsing. In these construction works, a cylindrical hole is formed in a concrete frame or bedrock using a rotary tool such as a drill, hole saw core drill, or core boring machine, and a hardening adhesive is injected into the hole to form a threaded or threaded hole. An anchor bolt such as a straight bar, L-shaped or J-shaped reinforcing bar, or various anchor elements is driven in and fixed.

For example, Patent Document 1 discloses a reinforcing device for an existing concrete structure, in which a reinforcing steel plate is used as an anchor element using a plurality of spike bond anchors so that the surface of the existing concrete and the plane of the reinforcing steel plate are horizontal. A reinforcing device for an existing concrete structure is disclosed in which the existing concrete structure is fixedly held and the space between the existing concrete surface and the reinforcing steel plate is filled with grout. This spike bond anchor consists of a cap and a bolt. Grooves are made in the existing concrete structure, and the surface area of the cap is used to bond the concrete to the concrete. The bolts are welded to the cap, and the anchor bolts are installed after grout is injected to obtain bearing capacity. It is stated that. However, a problem has arisen in that it is becoming difficult to meet recent construction demands for stronger tensile strength and pull-out strength by simply inserting and gluing these spike bond anchors into grooves in the concrete structure. Moreover, it is also desired that such an anchor element be manufactured easily and inexpensively and have a simple structure.

Furthermore, in Patent Document 2, after injecting water from a discharge port into a hydraulic composition, which is a cement composition powder, which is previously housed in a cylinder having a discharge port at one end, the cylinder cartridge is held in hand and shaken. The hydraulic composition and water are stirred by mechanically applying vibration to this cylinder cartridge, and the highly fluid cement paste thus prepared is extruded from the discharge port while being inserted into the cutout made in the concrete structure. A method is described in which the hole is injected and an anchor element, such as an anchor bar, is inserted therein.

However, anchor elements such as anchor strips are only fixed by the hardened product of the hydraulic composition coming into contact with and adhering to and joining the rod-shaped side surfaces, and this is due to the fact that they are rod-shaped. It has become difficult to meet the recent construction demands for easy pull-out and stronger tensile strength and pull-out strength. Moreover, strong tensile strength and pull-out strength cannot be obtained unless the anchor element, such as a rod-shaped anchor bar, is inserted deeply into an anchor installation hole such as a drilled hole, so it may hit the concrete reinforcing bar and cause damage. Further, anchor elements such as long rod-shaped anchor strips are often fixed at an angle due to gravity while the hydraulic composition is being cured and hardened, resulting in the problem of misalignment. Furthermore, if the hole is drilled sideways or diagonally, the misalignment will become more serious.

Utility model registration No. 3198237 Japanese Patent Application Publication No. 2013-147883

The present invention was made to solve the above-mentioned problems, and can exhibit much stronger tensile strength and pull-out strength than conventional ones, and does not cause misalignment when installed vertically, horizontally, or diagonally. To provide a simple anchor bolt with a flange that does not require making an anchor installation hole very deep, does not damage reinforcing bars, etc., and can be manufactured easily and inexpensively.

The flanged anchor bolt made to achieve the above object is used to be inserted into an anchor installation hole, embedded in a fixing material filled in the anchor installation hole, and fixed, and at least The side surface near the bolt head is a male thread, and the rod-shaped bolt part is long enough to be exposed on the bolt tip side from the anchor installation hole, and the threaded hole is a female thread that is screwed into the male thread in the middle. a head flange that is provided nearer to the bolt head, expands from the vicinity of the bolt head, has a smaller diameter than the anchor installation hole, and is embedded and fixed together with the bolt head in the fixing material within the anchor installation hole; , is characterized by having.

In this flanged anchor bolt, it is preferable that the screw hole is provided in the center of the head flange.

In this flanged anchor bolt, the head flange is, for example, in the shape of a disk, an elliptical plate, or a regular polygonal plate.

In this flanged anchor bolt, it is preferable that the entire side surface of the bolt portion has a male thread.

In this flanged anchor bolt, the screw hole either passes through the head flange portion or does not penetrate the head flange portion.

In this flanged anchor bolt, it is preferable that the head flange has a through hole opened in the head flange along the length direction.

This flanged anchor bolt may be such that an intermediate nut is screwed onto the male screw on a side closer to the tip of the bolt than the head flange to tighten the head flange.

In this flanged anchor bolt, the bolt portion is, for example, a hexagonal bolt, a button cap bolt, an eye bolt, or a butterfly bolt at the bolt head.

In this flanged anchor bolt, the screw hole passes through the head flange, the male screw passes through the head flange on the bolt head end side, and the head end nut extends from the head flange. The head flange may be tightened by being screwed onto the male screw at the end of the bolt head.

This flanged anchor bolt has a female thread that is separated from the head flange on the bolt tip side than the head flange and expands from the middle of the bolt part, and screws into the male screw. It is even more preferable that the screw hole is provided in the middle, and that the anchor has an intermediate flange portion having a smaller diameter than the anchor installation hole and embedded in the fixing material within the anchor installation hole.

In this flanged anchor bolt, it is preferable that the middle flanged portion has the same diameter as the head flanged portion.

It is even more preferable that the flanged anchor bolt has a through hole opened along the length direction in the middle flanged portion.

This flanged anchor bolt is provided with an intermediate nut screwed onto the male screw between the head flange and the middle flange. and may be tightened respectively.

This flanged anchor bolt may be such that a cylindrical pipe into which the bolt portion is inserted is provided between the head flange and the middle flange.

Specifically, in this flanged anchor bolt, it is preferable that the bolt portion has a diameter of 8 mm to 100 mm, and the head flange portion has a wider diameter of 20 mm to 510 mm.

Specifically, in this flanged anchor bolt, it is preferable that the anchor installation hole has a diameter of 22 mm to 512 mm, and the head flange has a smaller diameter of 20 mm to 510 mm.

This flanged anchor bolt may be such that a plurality of the bolt parts are provided point-symmetrically, line-symmetrically, or at equal intervals to the head collar part.

This flanged anchor bolt may be such that a cover that covers and closes the opening of the anchor installation hole is screwed onto and/or penetrated by the bolt.

The post-installation anchor construction method, which was used to achieve the above purpose, is to provide an anchor installation hole in a building, structure, building material, ground, or rock, inject a fixing material into the anchor installation hole, and then bolt. The flanged anchor bolt is inserted into the anchor installation hole so that the bolt portion is exposed from the anchor installation hole at the tip end, and the entire bolt head is embedded in the fixing material. .

When the flanged anchor bolt of the present invention is inserted into an anchor installation hole and is embedded and fixed in the fixing material filled in the anchor installation hole, the head flange becomes difficult to pull out due to the hardened fixing material. Therefore, it can exhibit much stronger tensile strength and pullout strength than conventional simple rod-shaped anchor bolts.

Furthermore, according to this flanged anchor bolt, even if it has a long bolt part, the head flange makes it difficult to tilt, so even if it is installed vertically, horizontally, or diagonally, It prevents tilting due to its own weight, and as a result, it does not cause misalignment, and it not only improves the accuracy of installing other parts that are installed later on the bolt part exposed outside the anchor installation hole, but also improves the accuracy of the installation. This improves flexibility and eliminates the need for unnecessary operations such as forcing separate parts into bolt parts.

Moreover, with this flange-attached anchor bolt, the head flange makes it possible to connect the bolt and the head without having to deeply dig the anchor installation hole and insert the bolt part of a simple rod-shaped anchor bolt all the way to the bottom. Tensile strength and pull-out strength can be increased simply by inserting the flange part to a relatively shallow depth. Therefore, it is not necessary to dig the anchor installation hole very deeply, and when drilling the anchor installation hole, it is possible to avoid damaging reinforcing bars and the like provided vertically and horizontally.

This flanged anchor bolt has a simple structure, and each member can be easily prepared or purchased at low cost. Therefore, the flanged anchor bolt can also be manufactured easily and inexpensively, and has a high yield and high productivity.

According to the post-installation anchor construction method of the present invention, by using this flanged anchor bolt, post-construction can be easily performed, and the flanged anchor bolt can be tilted with strong tensile strength and pull-out strength through subsequent construction. It can be installed without any problem.

FIG. 2 is a perspective view showing a flanged anchor bolt to which the present invention is applied. It is a perspective view showing another anchor bolt with a flange to which the present invention is applied. It is a perspective view showing another anchor bolt with a flange to which the present invention is applied. It is a perspective view showing another anchor bolt with a flange to which the present invention is applied. It is a schematic diagram which shows the use state of another anchor bolt with a flange to which this invention is applied. It is a schematic diagram which shows the use state of another anchor bolt with a flange to which this invention is applied. It is a perspective view showing another anchor bolt with a flange to which the present invention is applied. It is a perspective view showing another anchor bolt with a flange to which the present invention is applied. It is a schematic diagram showing a part of process in the post-installation anchor construction method to which the present invention is applied.

Hereinafter, embodiments for carrying out the present invention will be described in detail, but the scope of the present invention is not limited to these embodiments.

The flanged anchor bolt 1 of the present invention will be described with reference to FIG. It is used by being inserted into a pre-formed anchor installation hole 10. This flanged anchor bolt 10 is embedded together with the head flange portion 3 of the flanged anchor bolt 1 and the bolt portion 4 of the bolt head end side 2 into the fixing material 11 filled in the anchor installation hole 10, and the bolt tip side This is for a post-installation anchor construction method in which the bolt portion 4 of No. 5 is exposed from the anchor installation hole 10 and fixed.

An example of this flanged anchor bolt 1 has a bolt part 4 which is a male thread with a thread groove cut on the entire side surface, and a threaded hole 6 which is a female thread on the inner surface and is engaged with the male thread of the bolt part 4. It consists of a disk-shaped head flange 3 which is opened in the center and has a bolt 4 screwed into it near the head.

In this flanged anchor bolt 1, the head flange portion 3 has cylindrical through holes 8a and 8b opened along the length direction of the bolt portion 4 near the screw hole 6.

The depth D of the screw hole 6 is set so that the bolt part 4 is securely screwed into the head part 3 without shaking and is fixed without penetrating the head part 3. It is threaded so as to have a thickness of approximately 80 to 90% of the thickness T of the flange portion 3. As a result, the screw hole 6 of the head flange 3 functions as a nut, and the male screw of the bolt portion 4 is screwed together with the female screw of the screw hole 6 near the end of the head of the head side 2. It is firmly tightened. Due to this. On the head side 2 of the bolt part 4, a head collar part 3 is provided so as to expand from the end of the head.
Note that the screw hole 6 may pass through the head flange 3 and be screwed into the screw hole 6.

The diameter of the bolt portion 4 is smaller than the diameter of the head flange portion 3. Further, the diameter of the head flange 3 is slightly smaller than the diameter of the anchor installation hole 10 so that the head flange 3 can be easily inserted into the anchor installation hole 10.

The length of the bolt portion 4 is adjusted as appropriate depending on the length to be exposed from the anchor installation hole 10 depending on the details of the construction after the flanged anchor bolt 1 is installed.

In the flanged anchor bolt 1, the diameter of the bolt portion 4 is 8 to 100 mm, preferably 8 to 50 mm, more preferably 8 to 16 mm, even more preferably 8 to 12 mm, and the length of the bolt portion 4 is 30 to 1000 mm. , preferably 40 to 800 mm, more preferably 40 to 700 mm.

In the flanged anchor bolt 1, the diameter of the head flange 3 is 20 to 510 mm, preferably 30 to 300 mm, more preferably 50 to 100 mm, and the thickness T of the head flange 3 is 3 to 40 mm, preferably is 4 to 40 mm, more preferably 5 to 35 mm, even more preferably 6 mm.

In the flanged anchor bolt 1, the ratio of the diameter of the head flange portion 3 to the diameter of the bolt portion 4 is not particularly limited, but is preferably 10:1 to 3:1, and preferably 6:1 to 4:1. It is even more preferable.

The length of the bolt portion 4 is adjusted as appropriate depending on the details of the construction after the flanged anchor bolt 1 is installed. The flanged anchor bolt 1 has a length of the bolt portion 4 of the bolt head end 2 buried in the anchor installation hole 10 of 20 to 510 mm, preferably 50 to 400 mm, and more preferably 100 to 300 mm. It is. Accordingly, the depth at which the head flange 3 is buried in the anchor installation hole 10 is also adjusted. On the other hand, the length of the bolt portion 4 on the bolt tip side 5 exposed from the anchor installation hole 10 is 20 to 400 mm, preferably 25 to 300 mm, more preferably The length should be 25 to 200 mm.

The anchor installation hole 10 has a diameter of 22 to 512 mm, preferably 30 to 500 mm, more preferably 50 to 400 mm, even more preferably 50 to 300 mm. Although the play between the diameter of the head flange 3 and the diameter of the anchor installation hole 10 is not particularly limited, it is preferable that the diameter of the anchor installation hole 10 is 4 mm larger than the diameter of the head flange 3.

The bolt part 4 and the head flange part 3 of the flanged anchor bolt 1 are made of metal, for example, made of general structural rolled steel, more specifically, made of rolled steel equivalent to SS400 or higher, or stainless steel. Even if the metal surface is untreated, the metal surface may be surface-treated by coating treatment such as plating treatment, hard coating treatment, electrolytic corrosion treatment, hardening treatment, thermal diffusion treatment, nitriding treatment, sulfur-nitriding treatment. It may be something.

In the anchor bolt 1 with flange, if the screw hole 6 is drilled in the center of the head flange 3, the bolt part 4 will protrude from the center of the head flange 3. This is particularly preferred because it is easy to arrange.

The flanged anchor bolt 1 is manufactured as follows.

The side surface of the bolt part forming bar is threaded so that the bolt part 4 has a male thread. Drill a hole in the center of the disk for forming the head flange to an extent that it does not penetrate, and cut the inner surface of the screw hole 6 into a female thread so that it will engage with the male thread of the bolt part 4, and then form the head flange. Prepare part 3. When the bolt part 4 is screwed into the screw hole 6 of the head flange part 3 at the bolt head end 2 and tightened until it can no longer be rotated, the flanged anchor bolt 1 is produced.

Although the embodiment shown in FIG. 1(a) has been described as a representative example, another embodiment of the flanged anchor bolt 1 is as shown in FIG. 1(b). Unlike the embodiment shown in FIG. 1(a), the screw hole 6 passes through the head flange 3, the depth D of the screw hole 6 and the thickness T of the head flange 3 are the same, and the bolt part 4 is screwed into the screw hole 6 so that the bolt head end 2 does not protrude from the head flange 3 and is flush.

As shown in FIG. 1(c), the bolt head end 2 of the bolt portion 4 may protrude from the head collar portion 3.

The flanged anchor bolt 1 has one or more through holes 8a and 8b, preferably symmetrically, more preferably point symmetrically, line symmetrically, or equally spaced. The through-holes 8a and 8b are preferably formed so that when the anchor is inserted into the anchor installation hole 10, the anchoring material 11 filled therein passes through the through-holes 8a and 8b and easily sinks into the anchoring material 11. There are two or four.

The flanged anchor bolt 1 has two through holes 8a and 8b arranged symmetrically in a cylindrical shape near the center of the head flange 3, preferably near the screw hole 6, as shown in FIGS. 1(a) to (c). Although not shown, two symmetrical cylindrical, semi-cylindrical, or notched cylindrical holes may be provided near the screw hole 6 along or in contact with the edge of the head flange 3. may be provided.

As shown in FIG. 1(d), the flanged anchor bolt 1 does not need to have through holes 8a and 8b (see FIG. 1(a) to (c)).

Another aspect of the flanged anchor bolt 1 is that, as shown in FIG. The bolt portion 4 that protrudes and further protrudes may tighten the head flange portion 3 while being screwed into the head end nut 7 at the bolt head end side 2. As shown in FIG. 3B, in addition to FIG. The head collar portion 3 may be tightened. By using the nuts 7 and 7', it is possible to prevent the head flange 3 from rotating or loosening. It is preferable that the head end nut 7 and the intermediate nut 7' do not overlap each other so as not to obstruct the passage of the fixing material through the through holes 8a and 8b. The head end nut 7 may be integrated with the bolt portion 4, and the bolt head may be a hex bolt, a button cap bolt, an eye bolt, or a butterfly bolt. Although not shown, it is also possible to adopt a mode in which the head end nut 7 shown in FIG. 2B is not used. Although not shown, the bolt portion 4 may protrude from the head end nut 7 at the bolt head end side 2 and be screwed together.

Another aspect of the flanged anchor bolt 1, as shown in FIG. 3(a), is that in addition to the aspects shown in FIGS. The middle flange 3', which is provided with a female thread that engages with the screw, is threaded into the bolt 4 and expands from the middle, and is extended by a distance W ₁ from the head flange 3 on the bolt tip side 5. They may be provided separately. As shown in FIG. 3(b), the middle flange 3' may be rotated to widen or narrow the distance _W2 depending on the depth of the anchor installation hole 10. The distance W ₁ and W ₂ between the head flange 3 and the middle flange 3' is 0 to 500 mm, preferably 5 to 400 mm, and more preferably 10 to 300 mm. As shown in FIGS. 3(a) and 3(b), through holes 8a and 8b and through holes 8'a and 8'b are provided in the head flange 3 and middle flange 3', respectively. Preferably. The through holes 8a, 8'a and the through holes 8b, 8'b may be arranged along the same direction in the direction of the bolt portion 8, respectively, or may be arranged 90 degrees apart from each other. In FIGS. 3(a) and 3(b), the screw holes 6 and 6' do not pass through, as in FIG. An example is shown where there is no.

It is preferable that the head flange 3 and the middle flange 3' have the same shape and/or the same diameter.

If it has the head flange 3 and the middle flange 3', it can be stored upright as shown in FIGS. Since there is a distance W ₁ and W ₂ between the parts 3' and the parts 3', the parts can be stored so that they do not tilt even when laid down, and can be stored in a staggered manner to reduce the storage space.

Although the head flange 3 and the middle flange 3' are disk-shaped, they may be elliptical or regular polygonal, preferably hexagonal. At this time, it is preferable that the head flange 3 and the middle flange 3' be adjusted so that they do not shift from each other.

As shown in FIG. 4(a), the flanged anchor bolt 1 is screwed into the male thread of the bolt portion 4 between the head flange 3 and the middle flange 3'. 3- An intermediate nut 7'a having a thickness of ₁ is provided to tighten the head flange 3 and the intermediate flange 3', respectively. It may be. It is preferable that the intermediate nut 7'a does not cover the through holes 8a, 8b, 8'a, and 8'b so as not to obstruct the passage of the fixing material.
It is preferable that the head flange 3 and the intermediate nut 7'a and the intermediate flange 3' and the intermediate nut 7'a are respectively tightened.

As shown in FIG. 4(b), the flanged anchor bolt 1 has a bolt portion 4 penetrating between the head flange 3 and the middle flange 3'. By providing the intermediate tube 7'' with a thickness of W ₁ , the distance between the head flange 3' and the middle flange 3', the distance W ₁ is adjusted between the head flange 3 and the middle flange 3'. It is preferable that the intermediate tube 7'' does not cover the through holes 8a, 8b, 8'a, and 8'b so as not to obstruct the passage of the fixing material.

In another embodiment of the flanged anchor bolt 1, as shown in FIG. 4(c), the head flange portion 3 is connected to a head end nut 7 on the bolt head end side 2 of the bolt portion 4 and an intermediate nut 7' on the bolt front end side 5. and/or the middle flange portion 3' may be tightened by the middle inner nut 9 on the bolt head end side 2 of the bolt portion 4 and the middle outer nut 9' on the bolt front end side 5. It is preferable that these nuts 7, 7', 9, and 9' do not cover each other so as not to obstruct the passage of the fixing material through the through holes 8a, 8b, 8'a, and 8'b.

In FIGS. 2 and 4, washers may be inserted between these nuts and the head flange 3 and/or the middle flange 3' (not shown).

1 to 4, represented by FIG. 1(a), show a mode in which a flanged anchor bolt 1 is inserted into an anchor installation hole 10 drilled perpendicularly to a horizontal slope. As shown in FIG. 5(a), the flanged anchor bolt 1 is inserted into the anchor installation hole 10 made perpendicularly to the inclined slope 30, and while being fixed with the fixing material 11, the head flange is inserted. By arranging the part 3 and the middle flange part 3' along the slope, the flanged anchor bolt 1 can be installed without shifting the axis of the bolt part 4 from the perpendicular direction even if it is sloped. Good too.

When using the flanged anchor bolt 1, as shown in FIG. 1 is inserted and fixed with the fixing material 11, and the head flange 3 and middle flange 3' are arranged to face vertically, so that the anchor can be attached to the horizontally drilled anchor installation hole 10. The flanged anchor bolt 1 may be installed without shifting the axis of the bolt portion 4 from the horizontal direction.

When using the flanged anchor bolt 1, as shown in FIG. 6(a), the flanged anchor bolt is inserted into the anchor installation hole 10, which is opened perpendicularly to the horizontal slope 30a and into which the fixing material 11 is injected. 1 may be inserted, and while the fixing material 11 is hardened and fixed, the opening of the anchor installation hole 10 may be covered and closed with a cover 21 that is threaded onto and/or penetrates the bolt portion 4 of the flanged anchor bolt 1.

When using the flanged anchor bolt 1, as shown in FIG. 6(b), the flanged anchor bolt is inserted into the anchor installation hole 10, which is opened vertically directly below the inclined slope 30b and into which the fixing material 11 is injected. 1 is inserted, and while the fixing material 11 is hardened and fixed, the opening of the anchor installation hole 10 is covered with a bendable cover 22 that is threaded onto and/or penetrated through the bolt part 4 of the flanged anchor bolt 1, and the fixing material 11 is cured and fixed. The cover 22 may be folded to match the slope of the surface 30b.

When using the flanged anchor bolt 1, as shown in FIG. 6(b), the flanged anchor bolt is inserted into the anchor installation hole 10, which is drilled in a direction perpendicular to the horizontal slope 30a and into which the fixing material 11 is injected. 1 is inserted, and the fixing material 11 is hardened and fixed. On the other hand, an anchor installation hole 10 that is opened vertically directly below from the inclined slope 30b and into which the fixing material 11 is injected has a diameter that is approximately the same as or slightly smaller than the inner diameter of the anchor installation hole 10, and after being pushed into the slope 30a. Push in a pipe of the same length as the pipe 24, as necessary, further inject the fixing material 11 into the pipe 24 until it is full, insert the flanged anchor bolt 1 into the pipe 24, and add the fixing material 11 into the pipe 24. 11 may be hardened and fixed. The pipe 24 may be provided with a cover 23 over its opening.

As shown in FIG. 7, the flanged anchor bolt 1 has a bolt portion 4 threaded at a portion of the bolt head end 2, for example, approximately half the length, so as to have a male thread, and the bolt end 5 is threaded afterward. The shape may be such that it can be exposed from the anchor installation hole 10 after insertion of the anchor according to the details of the next installation of the anchor construction method.

As shown in FIG. 8, in the flanged anchor bolt 1, a plurality of bolt parts 8a to 8d, preferably four, are attached to the head collar part 3 symmetrically, preferably point symmetrically, line symmetrically, or equally. Through holes 8a to 8d are provided at intervals, or further, are provided symmetrically, preferably point symmetrically, line symmetrically, or at equal intervals between adjacent bolt portions 8a to 8d.

The flanged anchor bolt 1 is used in the post-installation anchor construction method as follows.

First, the anchor installation hole 10 is formed by digging, scraping, gouging, and/or hollowing in the building, structure, building material, ground, or bedrock to be later constructed, or the anchor installation hole 10 is formed in advance. It is prepared to form an anchor installation hole 10. For example, a cylindrical drill is used to drill a hole saw, and the cylindrical core is crushed with a chisel or the like and taken out to form the anchor installation hole 10 (anchor installation hole forming step).

As shown in FIG. 9(a), the hydraulic composition, which is an uncured adhesive, is brought into contact with water and a adhesive capsule sealed in a water-permeable cylindrical container. is absorbed to aggregate the hydraulic composition (aggregation step).

As shown in FIG. 9(b), the aggregated hydraulic composition is taken out from the water-permeable cylindrical container and placed in a cylinder cartridge having a tube tip at the tip and an opening at the base end, and then the aggregated hydraulic composition is removed from the water-permeable cylindrical container and placed in a cylinder cartridge having a cylindrical tip at the tip and an opening at the base end. Stir as required as shown in FIG. 2(d), and insert the lid, which moves toward the tip of the cylinder cartridge in response to pressure, through the opening (injection preparation step).

As shown in FIG. 9(e), the lid is pressed to extrude the hydraulic composition from the tip of the tube, and a curable paste containing a mixture of the curable composition and water is discharged into the anchor installation hole 10. It is injected as the fixing material 11 (injection step).

As shown in FIG. 1(a), the flanged anchor bolt 1 is inserted into the anchor installation hole 10 so that the bolt portion at the bolt tip end side 5 is exposed from the anchor installation hole 10 (insertion step).

After the head flange 3 and the bolt head are embedded in the fixing material 11, the fixing material 11 is hardened by curing. Then, the head flange part 3 of the flanged anchor bolt 1 and the bolt part 4 on the bolt head end side 2 are embedded in the flanged anchor bolt 1, leaving the bolt part 4 on the bolt tip side 5 exposed from the anchor installation hole 10. , fixed and fixed (fixing process). As a result, the post-installation anchor construction method is applied.

If necessary, post-installation is performed on the bolt portion 4 exposed from the anchor installation hole 10 (post-installation process).

The fixing material may be an inorganic fixing material such as cement or mortar that has been cured, or an organic fixing material that has been cured with an organic fixing agent such as a curable resin or curable composition. It may be wood.

The uncured fixing agent that hardens to become a fixing material includes, for example, Portland cement, alumina cement, and a hydraulic component containing a quick-setting agent, a viscosity modifier, a setting modifier, and fine aggregate. Hydraulic compositions include:

The content in the hydraulic composition is 20-60:30-70:10-40: portland cement, alumina cement, quick setting agent, viscosity modifier, setting modifier, and fine aggregate in mass ratio. It is preferably 0.1 to 1.0:1 to 10:10 to 40, and 20 to 50:30 to 60:20 to 40:0.1 to 0.8:1 to 8:10 to 30. The ratio is more preferably 20 to 40:30 to 50:20 to 30:0.1 to 0.5:1 to 5:15 to 30.

For example, when using Portland cement as a standard, 20, 30, 40, 50, or 60 parts by mass of Portland cement contains 30 parts of alumina cement: quick setting agent: viscosity modifier: setting modifier: fine aggregate. ~70:10~40:0.1~1.0:1~10:10~40 parts by mass, preferably 30~60:20~40:0.1~0.8:1~8: More preferably, the amount is 10 to 30 parts by weight, and even more preferably 30 to 50:20 to 30:0.1 to 0.5:1 to 5:15 to 30 parts by weight.

Based on alumina cement, 30, 40, 50, 60, or 70 parts by mass of alumina cement contains 20 to 60 parts of Portland cement: quick setting agent: viscosity modifier: setting modifier: fine aggregate. :10 to 40:0.1 to 1.0:1 to 10:10 to 40 parts by mass, preferably 20 to 50:20 to 40:0.1 to 0.8:1 to 8:10 to It is more preferably 30 parts by weight, and even more preferably 20-40:20-30:0.1-0.5:1-5:15-30 parts by weight.

Based on the quick-setting agent, for 10, 20, 30, or 40 parts by mass of the quick-setting agent, the ratio of Portland cement: alumina cement: viscosity modifier: setting modifier: fine aggregate is 20 to 60: 30-70:0.1-1.0:1-10:10-40 parts by mass is preferable, 20-50:30-60:0.1-0.8:1-8:10-30 It is more preferably 20 to 40:30 to 50:20 to 30:0.1 to 0.5:1 to 5:15 to 30 parts by weight.

When based on the viscosity modifier, the viscosity modifier is 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or For 1.0 part by mass, the ratio of Portland cement: alumina cement: quick setting agent: setting modifier: fine aggregate is 20 to 60:30 to 70:10 to 40:0.1 to 1.0:1 to 10. : preferably 10 to 40 parts by mass, more preferably 20 to 50:30 to 60:20 to 40:1 to 8:10 to 30 parts by mass, 20 to 40:30 to 50:20 to 30:0.1 to 0.5:1 to 5:15 to 30 parts by mass is even more preferable.

Based on the setting modifier, for 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 parts by mass of the setting modifier, Portland cement: Alumina cement: Rapid setting agent: Viscosity adjustment Agent: The fine aggregate is preferably 20 to 60:30 to 70:10 to 40:0.1 to 1.0:10 to 40 parts by mass, and 20 to 50:30 to 60:20 to 40: More preferably 0.1-0.8:10-30 parts by mass, 20-40:30-50:20-30:0.1-0.5:1-5:15-30 parts by mass. It is even more preferable that there be.

When based on fine aggregate, the ratio of Portland cement: alumina cement: quick setting agent: viscosity modifier: setting modifier is 20 to 60:30 for 10, 15, 20, or 30 parts by mass of fine aggregate. 〜70:10〜40:0.1〜1.0:1〜10 parts by mass, preferably 20〜50:30〜60:20〜40:0.1〜0.8:1〜8 parts by mass It is more preferably 20 to 40:30 to 50:20 to 30:0.1 to 0.5:1 to 5 parts by weight.

The fine aggregate reduces the shrinkage that occurs when the hardenable paste hardens after setting, and prevents the occurrence of cracks in the hardened product. It also alleviates the heat generated by the hydration reaction of hydraulic components, suppresses the temperature rise of the curable paste, and prevents an excessive increase in fluidity and an extension of the setting time. At least one selected from sands such as silica sand, river sand, sea sand, and crushed sand; inorganic materials such as alumina clinker, silica powder, and limestone; crushed urethane, EVA (ethylene vinyl acetate) foam, and crushed foamed resin. Of these, silica sand is preferred.

It is preferable that the fine aggregate does not contain coarse particles of 1 mm or more. Specifically, the particle size classification according to Table 3 of JIS G5901 (2016) is preferably set to Nos. 4 to 8, more preferably set to Nos. 5 to 8, and even more preferably set to Nos. 5 to 7. . By setting the particle size classification of the fine aggregate within this range, coarse particles of 1 mm or more can be excluded. The specific particle size distribution in this particle size classification is 600 to 1180 μm for No. 4, 425 to 850 μm for No. 4.5, 300 to 600 μm for No. 5, 212 to 425 μm for No. 5.5, 150 to 300 μm for No. 6, No. 6.5 is 106 to 212 μm, No. 7 is 75 to 150 μm, No. 7.5 is 53 to 106 μm, and No. 8 is 38 to 75 μm.

Particle size classification is determined by mesh sieves with three nominal openings. The mass ratio of the fine aggregate on the surface of each mesh sieve to the total mass of the measurement sample of fine aggregate is preferably 70% by mass or more, more preferably 80% by mass or more, and 90% by mass or more. It is more preferable that there be.

Further, the fine aggregate is contained in the hydraulic composition in an amount of 10 to 40 parts by mass, preferably 10 to 30 parts by mass, and more preferably 15 to 30 parts by mass. The fine aggregate content in this range has a lower limit of 8 to 38% by mass, preferably 8 to 25% by mass, and an upper limit of 27 to 67% by mass, preferably 27% by mass, based on the entire hydraulic composition. ~33% by mass. As described above, since the fine aggregate is fine particles with a particle size of less than 1.2 mm and has a low content of at most 67% by mass in the hydraulic composition, agglomeration of the hydraulic composition is not inhibited. . If the particle size, content, and content rate of fine aggregate exceed the above upper limit values, the hydraulic component and fine aggregate will separate during construction using a hardening paste, and the hardened material will not be in place. Unable to demonstrate the strength of the period.

The viscosity modifier is, for example, a thickener, and more specifically, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, and carboxymethylcellulose, and natural polysaccharide derivatives that may contain at least one of these; acrylamide; ; starch ether; and polymer electrolyte. Any of these may be used alone or in combination.

Viscosity modifiers that are such thickeners include methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, and carboxymethylcellulose, acrylamide, starch ether, and commercially available polyelectrolytes, such as natural polysaccharide derivatives. Examples include ESAMID HP (manufactured by Lamberti Spa), STARVIS S 5514 F, a mixture of polycarboxylic acid ether and polyacrylamide, and STARVIS SE 35 F, a starch ether (both manufactured by BASF Japan Ltd.).

Further, the polymer electrolyte is not particularly limited as long as it has a dissociative group in the main chain or side chain of the polymer chain and becomes a polymer ion when dissociated in water, such as a carboxyl group or a sulfonic acid group. groups, phosphoric acid, phosphorous acid, salts thereof, aliphatic, aromatic or heterocyclic group-containing amino groups, or inorganic and organic acid salts such as hydrochlorides or sulfates, alkali metal salts or alkaline earths. Salts such as similar metal salts, hydrocarbons having at least any dissociative group such as primary to quaternary ammonium groups or organic ammonium groups, heterohydrocarbons containing ether groups or amino groups, aromatic types , polymer ions having heterocyclic, amide and/or organic acid polymer chains, specifically natural products such as alginic acid and its salts, pectin (polygalacturonic acid) or its salts, carboxymethylcellulose or its Examples include salts, proteins and polypeptides, and examples of synthetic polymer compounds include polyacrylic acid or its salts such as polyacrylic acid sodium salt, polystyrene sulfonic acid or its salts such as sodium polystyrene sulfonate, poly(allylamine) or its hydrochloride, quaternized poly(vinylpyridine) or its salts, anionic polyacrylamides such as poly(acrylamide/sodium acrylate) copolymers and poly(sodium acrylamide-2-methyl-1-propanesulfonate), poly( Polymers containing cyclic repeating units containing anionic groups such as diallyldimethylammonium chloride), perfluoroalkyl sulfonic acid polymers such as Nafion (a trade name manufactured by Sigma-Aldrich), semi-aromatic ammonium ronenes, Arifa tic ammonium, heterocyclic ammonium ronenes, alkyl ether ammonium ronenes, free radical-containing polymer compounds, specifically STARVIS 308F (trade name manufactured by BASF Japan), Duramax, and Tamol. , Romax, Dowex (all brand names manufactured by Dow Chemical Company), Acusol, Acumer (all brand names manufactured by Rohm and Haas Company), Dispex and Magnafloc (all brand names manufactured by BASF).

If the hydraulic composition contains a viscosity modifier, when the hydraulic composition and water are mixed to form a hardening paste, it will have appropriate fluidity that makes it easy to inject into the drilling hole, and the upward drilling direction. By developing a suitable viscosity that does not flow out even when injected into the liquid, it is possible to balance the two and make adjustments to achieve both effects. Furthermore, the hardening paste exhibits excellent wettability due to the viscosity modifier, so it adheres to the fine aggregate and increases its fluidity. As a result, when the hardening paste is injected into the hole and an anchor element such as a reinforcing bar is driven into the hole, the anchor element becomes difficult to come out and becomes firmly fixed. .

In the hydraulic composition, the viscosity modifier, which is a thickener, is 0.1 to 1.0 parts by mass, preferably 0.1 to 0.8 parts by mass, more preferably 0.1 to 0.5 parts by mass. include. If the content exceeds this upper limit, the extrusion resistance from the curable paste pack increases significantly, and a cured product with sufficient strength cannot be obtained. On the other hand, if the content is less than the lower limit, the curable paste will lack viscosity.

In the hydraulic composition, the setting regulator is, for example, a setting time regulator, and adjusts the length of the setting time from the beginning of setting when the curable paste loses fluidity to the end of setting when hardening starts. The setting modifier adsorbs to the particles of the hydraulic component in the curable paste and coats the surface thereof, thereby suppressing contact between the hydraulic component and water. Thereby, the hydration reaction of the hydraulic component can be gradually progressed and instantaneous setting of the curable paste can be prevented. As setting time regulators, oxycarboxylic acids such as citric acid, gluconic acid, tartaric acid, malic acid, salicylic acid, m-oxybenzoic acid, and p-oxybenzoic acid, and their salts; inorganic carbonates; ligninsulfonic acid or a salt thereof; sugar alcohols such as sorbitol, pentitol, and hexitol can be used, and one or more of these can be used. Set time regulators include alkali metal salts such as lithium, potassium, and sodium salts, and alkaline earth metal salts such as magnesium and calcium salts of carbonic acid, oxycarboxylic acids, and ligninsulfonic acids. Of these, sodium citrate, lithium carbonate, potassium carbonate, and fumed silica (for example, Aerosil (trade name manufactured by Nippon Aerosil Co., Ltd.), which also serves as a strength enhancer) are preferred, and trisodium citrate, carbonate More preferred is any one of lithium and potassium carbonate, or a combination of two or more.

When this hydraulic composition contains a setting regulator, it prevents heat generation when mixed with water, prevents cracking during expansion and cooling, or when hardening the hardening paste, and also prevents hardening. It is difficult to harden until the hardening paste is injected into the drilled hole after a delay, but it hardens rapidly after being injected and during curing. Also, there is no need for a retardant fluidizing agent.

The setting regulator, which is a setting time regulator, is contained in the hydraulic composition in an amount of 1 to 10 parts by mass, preferably 1 to 8 parts by mass, and more preferably 1 to 5 parts by mass. If the content exceeds this upper limit, the setting time becomes too long and separation of, for example, hydraulic components and fine aggregate occurs before the setting is completed. On the other hand, if the content is less than this lower limit, the hydration reaction of the hydraulic component will proceed rapidly, and the curable paste will reach the end and harden immediately after the beginning of setting, resulting in cracks in the cured product and poor appearance. This can damage the aesthetics of buildings, and even when used as a water-stopping material, water can leak through cracks.

The hydraulic component of the hydraulic composition is an M-type expansive cement that essentially contains Portland cement, alumina cement, and an quick-setting agent. Portland cement has silica (SiO ₂ ) and calcia (CaO) as main components, and includes, for example, silica in an amount of 20 to 25% by mass and calcia in an amount of 60 to 70% by mass. In addition, alumina (Al ₂ O ₃ ), magnesia (MgO), and iron oxide (Fe ₂ O ₃ ) are each contained in an amount of 1 to 6% by mass. These components are present, for example, as calcium silicate, calcium aluminate, and calcium aluminoferrite.

Specific examples of Portland cement include ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, moderate heat Portland cement, sulfate-resistant Portland cement, and white Portland cement. Among them, early strength Portland cement is preferred. Only one type of these Portland cements may be used, or a mixture of multiple types may be used. The hydraulic composition contains 20 to 60 parts by mass, preferably 20 to 50 parts by mass, and more preferably 20 to 40 parts by mass of Portland cement.

Alumina cement is a special cement whose main component is calcium aluminate (CaO.Al ₂ O ₃ ), such as those containing 20 to 40 mass % of calcia and 40 to 80 mass % of alumina, respectively. . The hydraulic composition contains 30 to 70 parts by mass, preferably 30 to 60 parts by mass, and more preferably 30 to 50 parts by mass of alumina cement.

Portland cement and alumina cement are finely powdered cement powders, and the average particle size thereof is preferably 10 to 50 μm, more preferably 20 to 40 μm, and 20 to 40 μm. It is even more preferable that the thickness be 30 μm. Note that the average particle diameter refers to a volume-based distribution determined by laser diffraction/scattering method. An example of such an average particle size measuring device is a Shimadzu laser diffraction particle size distribution measuring device SALD-3100-WJA1:V1.00 (manufactured by Shimadzu Corporation). When the cement powder is such a fine powder, chemical aggregation due to hydration of the cement powder due to water absorption and physical aggregation due to the surface potential of the cement powder are likely to occur. As a result, due to chemical aggregation, physical aggregation, or the synergistic effect of both, the hardening paste injected into, for example, cracks in the ceiling or wall of a concrete structure is unlikely to leak therefrom.

Examples of the quick setting agent include sulfates such as sodium sulfate, potassium sulfate, aluminum sulfate, and calcium sulfate, and one or more of these can be used. As calcium sulfate, gypsum such as anhydrite (CaSO ₄ ), hemihydrate gypsum (CaSO ₄ 1/2H ₂ O), and dihydrate gypsum (CaSO ₄ 2H ₂ O) increases the production amount of ettringite, which will be described later. It is preferable from the viewpoint of These quick-setting agents may be used alone or in combination. In the hydraulic composition, the quick setting agent is contained in an amount of 10 to 40 parts by weight, preferably 20 to 40 parts by weight, and more preferably 20 to 30 parts by weight.

The hydraulic composition preferably does not contain retarded flow agents. However, it may also contain strength enhancers. The strength enhancer is silica fume which is fine silica particles, siliceous powder such as blast furnace slag powder and/or fly ash, and kaolin (kaolin containing silica and alumina, calcined kaolin, etc.). Delayed fluidizing agents are sulfonic acid-based fluidizing agents such as naphthalene sulfonic acid formalin condensate, melamine sulfonic acid formalin condensate, aromatic sulfonic acid formalin condensate, polystyrene sulfonic acid, lignin sulfonic acid, and salts thereof. agent; carboxylic acid-based fluidizing agent such as polycarboxylic acid and salts thereof.

As time passes, the curable paste undergoes a hydration reaction, causing the hydraulic components to coagulate and then harden. Specifically, the reaction of calcium aluminate, gypsum, and water in the alumina cement proceeds to produce ettringite (3CaO.Al ₂ O 3.3CaSO _{4.32H 2 O} ), which is a calcium aluminate sulfate hydrate. Furthermore, when the quick setting agent gypsum is consumed, ettringite reacts with calcium aluminate (aluminate phase) in the alumina cement to form monosulfate hydrate. Calcium sulfoaluminate hydrates such as ettringite and monosulfate hydrates are bulky, water-insoluble needle-shaped crystals, and as they grow, the hardening paste expands and condenses, gradually forming hardens. Furthermore, gypsum, which is an quick-setting agent, serves as a source of calcium sulfate, increases the amount of ettringite produced, and forms a hardened product with high strength.

The curable paste contains calcium hydroxide (Ca(OH) ₂ ), which is calcia in alumina cement dissolved in water. Silica fume and kaolin contained in the strength enhancer undergo a so-called pozzolanic reaction with this calcium hydroxide to form a water-insoluble hydrate. As a result, for example, fine and dense crystals of calcium silicate hydrate (3CaO・2SiO ₂・3H ₂ O) and calcium aluminate hydrate (3CaO・Al ₂ O ₃・6H ₂ O) are generated. , harden the curable paste to high strength. In particular, compared to blast furnace slag, which is turned into powder by pulverization, and fly ash, which is coal ash and has a relatively large spherical shape, the particles of calcined kaolin are fine and have a large surface area per unit mass. There is. Therefore, since silica fume and calcined kaolin have much higher pozzolanic activity than other siliceous powders, they form dense hydrate crystals and impart higher compressive strength to the cured product.

In this way, the hydraulic composition contains alumina cement, a quick-setting agent such as gypsum, and a strength enhancer mainly composed of kaolin, so that the hardened product remains within several hours to a day after installation. It exhibits early strength, which means that it develops high strength at a certain level.

In parallel with the production of ettringite and the pozzolanic reaction, a hydration reaction of calcium silicate in Portland cement proceeds, and a hardened body of calcium silicate hydrate such as tobermorite crystals is produced. As a result, the hydration reaction of calcium silicate is slower than that of calcium aluminate, so Portland cement is excellent in maintaining high strength over a long period of time, for example, from 7 days to several months after construction.

Examples to which the present invention is applied and comparative examples to which the present invention is not applied will be described below.

(Example 1)
The bolt part 4 shown in Fig. 1(a) is made of chromium molybdenum steel and has a diameter of 10 mm, a length of 250 mm, and has a male thread attached to its surface, and a bolt part 4 that is made of chromium molybdenum steel and has a diameter of 46 mm, a thickness of 6 mm, and a diameter of 7 mm. A flanged anchor bolt 1 consisting of a head flanged portion 3 provided with through holes 8a and 8b was used.

(Example 2)
The bolt part 4 shown in Fig. 3(a) is made of chromium molybdenum steel and has a diameter of 10 mm, a length of 250 mm, and has a male thread attached to its surface, and a bolt part 4 that is made of chromium molybdenum steel and has a diameter of 46 mm, a thickness of 6 mm, and a diameter of 7 mm. A flanged anchor bolt 1 was used, which includes a head flange 3 and a middle flange 3' separated by a distance _W1 of 8 mm while providing through holes 8a, 8b and 8'a, 8'b.

(Comparative example 1)
A conventional anchor bolt consisting of a rod having a diameter of 10 mm and a length of 250 mm with a male thread on its surface was used.

As described below, using the flanged anchor bolt 1 of the example and the anchor element of the comparative example, a post-installation anchor construction method was performed in a pseudo manner, and an adhesion strength measurement test was conducted.

(Formation of anchor installation hole)
Using a hole saw drill (Shibuya Light Bit manufactured by Shibuya Co., Ltd.), drill a hole into the concrete block for testing, crush the cylindrical core with a chisel, take it out, and make 10 anchor installation holes with a diameter of 50 mm and a depth of 50 mm. was formed.

(Preparation of hydraulic composition)
As raw materials, 30 parts by mass of early-strength Portland cement (manufactured by Ube Mitsubishi Cement Co., Ltd., early-strength Portland cement), 50 parts by mass of alumina cement (manufactured by Denka Corporation, alumina cement No. 1 molten product), and quick-set gypsum. 28 parts by mass of gypsum hemihydrate β type SB manufactured by Noritake Company Limited, 0.2 parts by mass of STARVIS 308F (trade name manufactured by BASF Japan Co., Ltd.) as a viscosity modifier, and tartaric acid as a setting modifier. A hydraulic composition was prepared by adding 1.8 parts by mass and 25 parts by mass of silica sand No. 7 (trade name, manufactured by Nichihyougyo Co., Ltd.), which is a fine aggregate, into a mixer and stirring.

(Preparation of adhesive capsule)
450 g of the hydraulic composition was sealed in a water-permeable cylindrical container made of a non-woven sheet made of Heatron paper with a basis weight of 40 g/ ^m2 , and the adhesive capsules of Examples and Comparative Examples were 300 mm long and 34 mm in diameter. I got it. This was immersed in tap water at 20°C for 5 minutes.

(Adhesion strength test)
The water-permeable cylindrical container of the adhesive capsule was destroyed, and the aggregated uncured adhesive material was taken out and placed in a cylinder cartridge having a cylindrical tip fitted with a cap at the tip and an opening at the proximal end. The stirrer is made by connecting the base end of a stirring rod (manufactured by Fujiwara Sangyo Co., Ltd., product name: Paint Mixer SPM-4), which has a stirring blade at the tip of the rotating rod, to an electric impact driver, which is a rotating tool. A curable paste-like adhesive material was prepared by inserting a stirring blade into the cylinder cartridge through the opening and stirring for 10 seconds to disperse the aggregated uncured adhesive material within the cylinder cartridge. This hardening paste-like fixing material was poured into the anchor installation hole 10 and injected. The flanged anchor bolts 1 of Examples 1 and 2 and the anchor elements of Comparative Examples 1 and 2 were each inserted into the anchor installation hole 10 so that 20 cm of the bolt portion 4 was exposed at the bolt tip side 5. After the bolt head was embedded in a hardening paste-like adhesive, the adhesive was cured for 7 days to harden and adhere in accordance with JIS A1108 (2006). For the adhesion strength test, we used a hydraulic pump, a hydraulic jack connected to it that uses the hydraulic pressure generated by the hydraulic pump to pull the anchor bolt out of the test concrete block, and a load cell that measures the load generated by the hydraulic jack. An adhesion strength test was conducted using a tensile testing machine equipped with a displacement meter that measures the amount of displacement of the anchor bolt. The results are shown in Table 1.

As is clear from Table 1, when the flanged anchor bolts 1 of Examples 1 and 2 were used, the adhesion strength was more than twice as strong as that of the bar-shaped bolt, which is a conventional construction product, of Comparative Example 1. Ta.

The flanged anchor bolt of the present invention and the post-installation anchor construction method using the same are useful for increasing the seismic strength and durability of buildings and structures such as existing concrete frames such as culverts, dam bodies, tunnels, and buildings. Reinforcement work to improve shear strength, installation work that connects other building materials to buildings/structures during construction or afterward, and covering the slopes of the ground/rock to prevent them from collapsing. It is used when installing structures such as rockfall protection nets and avalanche prevention fences on so-called stretched concrete.

1 is an anchor bolt with a flange, 2 is the bolt head end side, 3 is the head flange part, 3' is the middle flange part, 4, 4a, 4b, 4c, 4d are the bolt parts, 5 is the bolt tip side, 6. 6' is a screw hole, 7 is a head end nut, 7' and 7'a are intermediate nuts, 7'' is an intermediate tube, and the through holes are 8a, 8b, 8'a, 8'b, 8c, 8d, and 9 is an intermediate nut. 9' is the inner nut, 9' is the middle outer nut, 10 is the anchor installation hole, 11 is the fixing material, 21, 22, 23 are the covers, 24 is the pipe, 30a, 30b are the slopes, D is the depth of the screw hole, T is the thickness of the head flange, and W ₁ and W ₂ are the distances between the head flange and the middle flange.

Claims (19)

A flanged anchor bolt that is inserted into an anchor installation hole and used to be embedded and fixed in a fixing material filled in the anchor installation hole,
At least the side surface near the bolt head has a male thread, and the rod-shaped bolt part is long enough to be exposed from the anchor installation hole on the bolt tip side, and the threaded hole is a female thread that is screwed into the male thread. a head flange that is provided in the middle and expands from near the bolt head, has a smaller diameter than the anchor installation hole, and is embedded and fixed together with the bolt head in the fixing material within the anchor installation hole; An anchor bolt with a flange, characterized by having the following. The flanged anchor bolt according to claim 1, wherein the screw hole is provided in the center of the head flanged portion. The flange-equipped anchor bolt according to claim 1, wherein the head flange is in the shape of a disc, an ellipse, or a regular polygon. The flanged anchor bolt according to claim 1, wherein a side surface of the bolt portion is entirely male threaded. The flanged anchor bolt according to claim 1, wherein the screw hole passes through the head flange or does not penetrate the head flange. The flanged anchor bolt according to claim 1, wherein the head flange has a through hole opened in the head flange along the length direction. 2. The flanged anchor bolt according to claim 1, wherein the intermediate nut is screwed onto the male screw on the side closer to the tip of the bolt than the head flange to tighten the head flange. The flanged anchor bolt according to claim 1, wherein the bolt portion has a hexagonal bolt, a button cap bolt, an eye bolt, or a butterfly bolt at the bolt head. The screw hole passes through the head flange, the male screw passes through the head flange on the bolt head end side, and the head end nut is closer to the bolt head end than the head flange. The flange-equipped anchor bolt according to claim 1, wherein the head flange is tightened by being screwed into the male screw. The screw hole, which is a female screw that is screwed into the male screw, is moved toward the center while expanding from the middle of the bolt portion while being further away from the head flange on the front end side of the bolt than the head flange. The flanged anchor bolt according to claim 1, further comprising a middle flanged portion having a smaller diameter than the anchor installation hole and embedded in the fixing material within the anchor installation hole. The flanged anchor bolt according to claim 10, wherein the middle flange has the same diameter as the head flange. The flanged anchor bolt according to claim 10, wherein the middle flanged portion has a through hole opened along the length direction. An intermediate nut screwed onto the male screw is provided between the head flange and the middle flange to tighten the head flange and the middle flange, respectively. The flanged anchor bolt according to claim 10. The flanged anchor bolt according to claim 10, wherein a cylindrical pipe into which the bolt portion is inserted is provided between the head flange and the middle flange. The flanged anchor bolt according to claim 1, wherein the bolt portion has a diameter of 8 mm to 100 mm, and the head flange portion has a wider diameter of 20 mm to 510 mm. The flanged anchor bolt according to claim 1, wherein the anchor installation hole has a diameter of 22 mm to 512 mm, and the head flange has a smaller diameter of 20 mm to 510 mm. The flanged anchor bolt according to claim 1, wherein a plurality of the bolt parts are provided point-symmetrically, line-symmetrically, or equally spaced to the head collar part. The flanged anchor bolt according to claim 1, wherein a cover that covers and closes the opening of the anchor installation hole is threaded onto and/or penetrated by the bolt. Providing anchor installation holes in buildings, structures, building materials, the ground, or bedrock,
Injecting a fixing material into the anchor installation hole,
The flanged anchor bolt according to claim 1 is inserted into the anchor installation hole so that the bolt portion is exposed from the anchor installation hole on the bolt tip side, and the bolt head is embedded in the fixing material. Post-installation anchor construction method is a feature.

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