Flanged anchor bolts and post-installed anchoring methods using them

Abstract

To provide a simple flanged anchor bolt which can exhibit much stronger tensile strength and pull-out strength than conventional ones, does not cause misalignment when installed vertically, horizontally, or diagonally, does not require an anchor installation hole to be very deep, does not damage a reinforcement etc., and can be manufactured easily and inexpensively.SOLUTION: A flanged anchor bolt 1 is inserted into an anchor installation hole 10, and embedded in a fastening material 11 filled in the anchor installation hole 10 to be fixed. The flanged anchor bolt 1 comprises: a rod-shaped bolt portion 4 having a male thread at least on a side surface near a bolt head and having a length such that a bolt tip side 5 can be exposed from the anchor installation hole 10; and a head flange portion 2 which has a threaded hole 6 having a female thread to be screwed into the male thread near the center, which expands from a vicinity of the bolt head and has a smaller diameter than that of the anchor installation hole 10, and which is embedded and fixed together with the bolt head in the fastening material 11 within the anchor installation hole 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a post-construction anchor method, which is used by fixing a caulked anchor bolt such as a rebar or various anchor elements with a flange to a concrete structure such as a culvert, a dam body, or a building, or to a rock mass.

Background Art

[0002] Reinforcement work to improve the shear strength is carried out to enhance the seismic resistance and durability of existing concrete structures such as culverts, dam bodies, tunnels, and buildings. Also, installation work to attach another building material laterally to these buildings, during the construction process, or to the building materials is carried out. Alternatively, so-called shotcrete that covers the slope of the ground or rock mass to prevent its collapse is installed with structures such as rockfall protection nets or avalanche prevention fences as necessary. These construction works involve forming a cylindrical hole in a concrete structure or rock mass using a rotary tool such as a drill, a hole saw core drill, or a core boring machine, injecting a curable fixing material into the hole, and driving and fixing an anchor bolt such as a straight bar-shaped, L-shaped, or J-shaped rebar or various anchor elements with a flange.

[0003] For example, Patent Document 1 discloses a reinforcement device for existing concrete structures, in which a reinforcing steel plate is fixed and held by multiple spike bond anchors as anchor elements so that the surface of the existing concrete and the plane of the reinforcing steel plate are horizontal, and grout is filled into the space between the existing concrete surface and the reinforcing steel plate. This spike bond anchor is described as consisting of a cap and a bolt, and is a post-installed anchor bolt that is bonded to the concrete by the surface area of ​​the cap by making a groove in the existing concrete structure, and grout is injected with a bolt welded to the cap to obtain bearing capacity. However, simply fitting and bonding this spike bond anchor into a groove made in the concrete structure is no longer sufficient to meet the recent construction requirements that demand stronger tensile and pull-out strengths. Moreover, there is a need for such anchor elements to be manufactured inexpensively and easily and to have a simple structure.

[0004] Furthermore, Patent Document 2 describes a method in which, after injecting water into a hydraulic composition, which is a cement-based composition powder pre-contained in a cylinder having a discharge port at one end, the hydraulic composition and water are stirred by shaking the cylinder cartridge by hand or by vibrating the cylinder cartridge with a machine, and the resulting highly fluid cement paste is injected into a bore drilled in a concrete structure while being pushed out from the discharge port, and an anchor element such as an anchor bar is inserted therein.

[0005] However, anchor elements such as reinforcing bars are only fixed by the hardened hydraulic composition contacting and adhering to their rod-shaped sides. Due to their rod shape, they are easily pulled out, making it difficult to meet the recent construction requirements for higher tensile and pull-out strength. Moreover, strong tensile and pull-out strength cannot be obtained unless rod-shaped anchor elements such as reinforcing bars are inserted deeply into anchor installation holes such as drilled holes, which can damage the concrete reinforcing bars. Furthermore, long rod-shaped anchor elements such as reinforcing bars often tilt due to gravity while the hydraulic composition is curing and hardening, resulting in misalignment problems. Moreover, if the drilling is lateral or oblique, this misalignment becomes even more serious. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Utility Model Registration No. 3198237 Gazette [Patent Document 2] Japanese Patent Publication No. 2013-147883 [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention was made to solve the aforementioned problems, and aims to provide a simple flanged anchor bolt that can exhibit much stronger tensile and pull-out strength than conventional anchors, does not cause misalignment when installed in the vertical, horizontal, or diagonal directions, does not require a very deep anchor hole, does not damage reinforcing bars, etc., and can be manufactured inexpensively and easily. [Means for solving the problem]

[0008] The flanged anchor bolt, designed to achieve the aforementioned objective, is used to be inserted into an anchor installation hole and embedded and fixed in a fastening material filled in the anchor installation hole, and is characterized by having a rod-shaped bolt portion with a length that can be exposed from the anchor installation hole at the tip side, with at least the side near the bolt head being a male thread, and a head flange portion that is provided closer to the center and has a female thread that screws into the male thread, expanding from near the bolt head, and having a smaller diameter than the anchor installation hole, for embedding and fixing the bolt head and all of it in the fastening material within the anchor installation hole. This flanged anchor bolt has a male thread on the entire side of the bolt portion, and a female thread hole that screws into the male thread is provided closer to the center, expanding from the middle of the bolt portion, away from the head flange, on the bolt tip side, and having a middle flange portion that is smaller in diameter than the anchor installation hole and is embedded in the fixing material within the anchor installation hole.

[0009] In this flanged anchor bolt, it is preferable that the screw hole is located in the center of the flange portion of the head.

[0010] This flanged anchor bolt is characterized in that the flange portion of the head is, for example, disc-shaped, elliptical, or regular polygonal.

[0011] In this flanged anchor bolt, it is preferable that the entire side surface of the bolt portion is a male thread.

[0012] This flanged anchor bolt has a screw hole that either penetrates the flange portion of the head or does not penetrate it.

[0013] In this flanged anchor bolt, it is preferable that the head flange portion has a through hole drilled in the head flange portion along the longitudinal direction.

[0014] This flanged anchor bolt may also have an intermediate nut that screws onto the male thread on the bolt tip side of the head flange, thereby tightening the head flange.

[0015] This flanged anchor bolt is characterized in that the bolt portion is, for example, a hexagonal bolt, button head bolt, eye bolt, or wing bolt at the bolt head.

[0016] This flanged anchor bolt may be such that the screw hole penetrates the head flange, the male screw protrudes through the head flange at the bolt head end, and the head nut screws onto the male screw on the bolt head end side of the head flange, thereby tightening the head flange.

[0017] It is even more preferable that this flanged anchor bolt has a screw hole located closer to the center, which is a female screw that screws onto the male screw, expanding from the middle of the bolt portion while moving away from the head flange portion towards the bolt tip, and having a middle flange portion that is smaller in diameter than the anchor installation hole and is embedded in the fixing material within the anchor installation hole.

[0018] In this flanged anchor bolt, it is preferable that the middle flange portion has the same diameter as the head flange portion.

[0019] It is even more preferable that the flanged anchor bolt has a through hole drilled along its length in the middle flange portion.

[0020] This flanged anchor bolt may also have an intermediate nut, which is screwed onto the male thread, between the head flange and the middle flange, thereby tightening the head flange and the middle flange, respectively.

[0021] This flanged anchor bolt may be such that the cylindrical pipe into which the bolt portion is inserted is provided between the head flange and the middle flange.

[0022] Specifically, this flanged anchor bolt preferably has a bolt portion with a diameter of 8 mm to 100 mm, and a head flange portion that is wider in diameter, with a diameter of 20 mm to 510 mm.

[0023] Specifically, this flanged anchor bolt preferably has an anchor installation hole with a diameter of 22 mm to 512 mm, and a flange portion at the head that is smaller in diameter, with a diameter of 20 mm to 510 mm.

[0024] The plurality of the bolt portions of this flanged anchor bolt may be provided on the head flange portion symmetrically with respect to a point, or symmetrically with respect to a line, or at equal intervals.

[0025] This flanged anchor bolt may be such that a cover for covering and closing the opening of the anchor installation hole is screwed onto and / or penetrated through the bolt.

[0026] The construction anchor method made to achieve the above object is to provide an anchor installation hole in a building, a structure, a building material, a ground, or a rock formation, inject a fixing material into the anchor installation hole, and expose the bolt portion from the anchor installation hole on the bolt tip side. The flanged anchor bolt is inserted into the anchor installation hole and embedded in the fixing material together with the bolt head.

Effect of the Invention

[0027] When the flanged anchor bolt of the present invention is inserted into an anchor installation hole and embedded and fixed in a fixing material filled in the anchor installation hole, the head flange portion is difficult to be pulled out by the hardened fixing material, so that a tensile strength and a pull-out strength much stronger than those of a simple rod-shaped anchor bolt in the prior art can be exhibited.

[0028] Furthermore, according to this flanged anchor bolt, even if it has a long bolt portion, it is difficult to be inclined by the head flange portion. Therefore, even when it is installed in the vertical direction, the horizontal direction, or the diagonal direction, it can be prevented from being inclined by its own weight. As a result, it does not cause misalignment, and not only does the construction accuracy of a separate member installed laterally on the bolt portion exposed outside the anchor installation hole increase, but also the workability is improved, and there is no need to perform a useless operation of forcibly pushing the separate member into the bolt portion.

[0029] Furthermore, with this flanged anchor bolt, it is not necessary to drill the anchor hole deeply and insert the bolt portion of a conventional simple rod-shaped anchor bolt all the way to the bottom. The flange on the head allows for increased tensile and pull-out strength by inserting the bolt portion and the flange relatively shallowly. Therefore, it is not necessary to drill the anchor hole very deep, and it is possible to avoid damaging reinforcing bars or other structural elements when drilling the anchor hole.

[0030] These flanged anchor bolts have a simple structure, and all of their components can be prepared or purchased inexpensively and easily. Therefore, flanged anchor bolts can be manufactured inexpensively and easily, resulting in a good yield and high productivity.

[0031] According to the post-installation anchor method of the present invention, by using this flanged anchor bolt, post-installation can be easily performed, and this post-installation allows the flanged anchor bolt to be installed without tilting with high tensile strength and pull-out strength. [Brief explanation of the drawing]

[0032] [Figure 1] This is a perspective view showing a flanged anchor bolt to which the present invention is applied. [Figure 2] This is a perspective view showing another flanged anchor bolt to which the present invention is applied. [Figure 3] This is a perspective view showing another flanged anchor bolt to which the present invention is applied. [Figure 4] This is a perspective view showing another flanged anchor bolt to which the present invention is applied. [Figure 5] This is a schematic diagram showing the usage of another flanged anchor bolt to which the present invention is applied. [Figure 6] This is a schematic diagram showing the usage of another flanged anchor bolt to which the present invention is applied. [Figure 7] This is a perspective view showing another flanged anchor bolt to which the present invention is applied. [Figure 8] This is a perspective view showing another flanged anchor bolt to which the present invention is applied. [Figure 9] This is a schematic diagram showing a part of the process in a post-installed anchoring method to which the present invention is applied. [Modes for carrying out the invention]

[0033] The following describes in detail embodiments for carrying out the present invention, but the scope of the present invention is not limited to these embodiments.

[0034] The flanged anchor bolt 1 of the present invention, as described with reference to Figure 1(a), is used by being inserted into an anchor installation hole 10 that is dug, cut, gouged, and / or carved out or pre-formed in a building, structure, building material, ground, or bedrock. This flanged anchor bolt 10 is embedded in the fixing material 11 filled in the anchor installation hole 10, including the flange portion 3 of the head of the flanged anchor bolt 1 and the bolt portion 4 on the bolt head end side 2, and is fixed so that the bolt portion 4 on the bolt tip side 5 is exposed from the anchor installation hole 10, and is for post-installed anchor construction methods.

[0035] An example of this flanged anchor bolt 1 consists of a bolt portion 4, which is a male screw with threads cut across its entire side surface, and a disc-shaped head flange portion 3, which is a female screw on its inner surface and has a screw hole 6 in the center that engages with the male screw of the bolt portion 4, while the bolt portion 4 is screwed into it near the head.

[0036] This flanged anchor bolt 1 has cylindrical through holes 8a and 8b drilled along the length of the bolt portion 4, with the head flange portion 3 closer to the screw hole 6.

[0037] The screw hole 6 is threaded such that its depth D is approximately 80-90% of the thickness T of the head flange 3, so that the bolt portion 4 is securely screwed into the head flange 3 without wobbling, without penetrating the head flange 3. As a result, the screw hole 6 in the head flange 3 acts as a nut, and the male thread of the bolt portion 4 screws into the female thread of the screw hole 6 near the end of the head on the head side 2, tightening it securely. This allows the head flange 3 to expand from the end of the head on the head side 2 of the bolt portion 4. The screw hole 6 may also be threaded through the head flange 3.

[0038] The diameter of the bolt portion 4 is smaller than the diameter of the head flange portion 3. Furthermore, the diameter of the head flange portion 3 is somewhat smaller than the diameter of the anchor installation hole 10 in order to facilitate insertion of the head flange portion 3 into the anchor installation hole 10.

[0039] The length of the bolt portion 4 is adjusted as appropriate according to the length that should be exposed from the anchor installation hole 10, based on the post-installation details of the flanged anchor bolt 1.

[0040] The flanged anchor bolt 1 has a bolt portion 4 diameter of 8 to 100 mm, preferably 8 to 50 mm, more preferably 8 to 16 mm, and even more preferably 8 to 12 mm, and a bolt portion 4 length of 30 to 1000 mm, preferably 40 to 800 mm, and more preferably 40 to 700 mm.

[0041] The flanged anchor bolt 1 has a head flange 3 with a diameter of 20 to 510 mm, preferably 30 to 300 mm, more preferably 50 to 100 mm, and a head flange 3 with a thickness T of 3 to 40 mm, preferably 4 to 40 mm, more preferably 5 to 35 mm, and even more preferably 6 mm.

[0042] The ratio of the diameter of the flange portion 3 to the diameter of the bolt portion 4 of the flanged anchor bolt 1 is not particularly limited, but is preferably 10:1 to 3:1, and more preferably 6:1 to 4:1.

[0043] The length of the bolt portion 4 is adjusted as appropriate depending on the post-installation details of the flanged anchor bolt 1. The flanged anchor bolt 1 has a bolt portion 4 on the bolt head end side 2 embedded in the anchor installation hole 10 that is 20 to 510 mm, preferably 50 to 400 mm, and more preferably 100 to 300 mm long. Accordingly, the depth to which the head flange portion 3 is embedded 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, and more preferably 25 to 200 mm long, depending on the post-installation details of the flanged anchor bolt 1.

[0044] The anchor mounting hole 10 has a diameter of 22 to 512 mm, preferably 30 to 500 mm, more preferably 50 to 400 mm, and even more preferably 50 to 300 mm. The clearance between the diameter of the head flange 3 and the diameter of the anchor mounting hole 10 is not particularly limited, but it is preferable that the diameter of the anchor mounting hole 10 be 4 mm larger than the diameter of the head flange 3.

[0045] The bolt portion 4 and head flange portion 3 of the flanged anchor bolt 1 are made of metal, for example, general structural rolled steel, more specifically rolled steel equivalent to SS400 or higher, or stainless steel, and the metal surface may be untreated, or the metal surface may be surface treated by a coating treatment such as plating, hard coating treatment, electrolytic corrosion treatment, quenching treatment, thermal diffusion treatment, nitriding treatment, or sulfidizing treatment.

[0046] A flanged anchor bolt 1 is particularly preferable because, if the screw hole 6 is drilled in the center of the head flange 3, the bolt portion 4 will protrude from the center of the head flange 3, making it easier to position it in the center of the anchor installation hole 10.

[0047] A flanged anchor bolt 1 is manufactured as follows:

[0048] The side of the rod material for forming the bolt portion is threaded so that the bolt portion 4 becomes a male thread. A hole is drilled in the center of the disc for forming the head flange, but not all the way through, and the inner surface of the threaded hole 6 is threaded to become a female thread so that it can be threaded with the male thread of the bolt portion 4, thereby preparing the head flange portion 3. The bolt portion 4 is screwed into the threaded hole 6 of the head flange portion 3 at the bolt head end 2 and tightened until it can no longer be rotated, thereby creating a flanged anchor bolt 1.

[0049] As a representative example, the embodiment shown in Figure 1(a) has been described, but another embodiment of the flanged anchor bolt 1 is as shown in Figure 1(b). Unlike the embodiment in Figure 1(a), the screw hole 6 penetrates 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 portion 4 is screwed into the screw hole 6 such that the bolt head end 2 does not protrude from the head flange 3 but is flush with it.

[0050] As shown in Figure 1(c), the bolt portion 4 may have its bolt head end 2 protruding from the head flange portion 3.

[0051] The flanged anchor bolt 1 has one or more through holes 8a and 8b, preferably symmetrically, more preferably point-symmetrically, line-symmetrically, or at equal intervals. The through holes 8a and 8b are preferably two or four in number so that when the bolt is inserted into the anchor installation hole 10, the adhesive 11 filled therein can easily penetrate the adhesive 11 by passing through the through holes 8a and 8b.

[0052] The flanged anchor bolt 1 may have two symmetrically arranged cylindrical through holes 8a and 8b near the center of the head flange 3, preferably near the screw hole 6, as shown in Figures 1(a) to (c). Although not shown, two symmetrically arranged 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.

[0053] The flanged anchor bolt 1 does not necessarily have through holes 8a and 8b (see Figures (a) to (c)), as shown in Figure 1(d).

[0054] Another embodiment of the flanged anchor bolt 1, as shown in Figure 2(a), may be such that the screw hole 6 penetrates the head flange 3, the bolt portion 4 protrudes from the head flange 3 at the bolt head end 2, and the protruding bolt portion 4 screws into the head nut 7 at the bolt head end 2, thereby tightening the head flange 3. As shown in Figure 2(b), in addition to Figure 2(a), the bolt portion 4 screws into the intermediate nut 7' at the bolt head end 2, and the head flange 3 is tightened by the head nut 7 and the intermediate nut 7'. Using nuts 7 and 7' can prevent the head flange 3 from rotating or loosening. It is preferable that the head nut 7 and the intermediate nut 7' do not overlap so as not to obstruct the passage of fastening material through the through holes 8a and 8b. The head nut 7 may be integrated with the bolt portion 4 and may be a hexagonal bolt, button cap bolt, eye bolt, or wing bolt at the bolt head. Although not shown, the configuration may also be one in which the head nut 7 shown in Figure (b) is not used. Although not shown, the bolt portion 4 may protrude from the head nut 7 at the bolt head end side 2 and be screwed in.

[0055] Another embodiment of the flanged anchor bolt 1, as shown in Figure 3(a), is that, in addition to the embodiments in Figures 1(a) to (c), a middle flange portion 3' is provided, which has a screw hole 6' in the center and a female screw that screws into the male screw of the bolt portion 4. The middle flange portion 3' screws into the bolt portion 4 and expands from the middle, and is provided at the bolt tip side 5 at a distance W1 from the head flange portion 3. As shown in Figure 3(b), the middle flange portion 3' may be rotated to appropriately widen or narrow at a distance W2 according to the depth of the anchor installation hole 10. The distance W1·W2 between the head flange portion 3 and the middle flange portion 3' is 0 to 500 mm, preferably 5 to 400 mm, and more preferably 10 to 300 mm. As shown in Figures 3(a) to (b), it is preferable that through holes 8a·8b and through holes 8'a·8'b are provided in the head flange portion 3 and the middle flange portion 3', respectively. The through holes 8a·8'a and 8b·8'b may be arranged along the same direction as the bolt portion 8, or they may be offset by 90°. Figures 3(a) and 3(b) show an example in which the screw holes 6·6' do not go all the way through, similar to Figure 1(a), and the bolt head end side 2 of the bolt portion 4 does not penetrate the head flange portion 3.

[0056] It is preferable that the head flange 3 and the middle flange 3' are the same shape and / or have the same diameter.

[0057] Having a head flange 3 and a middle flange 3' allows for storage upright as shown in Figures 3(a) and 3(b). The distance W1 and W2 between the head flange 3 and the middle flange 3' prevents tilting when laid on its side, and allows for storage in an alternating pattern to reduce storage space.

[0058] Although the example shown illustrates the head flange 3 and the middle flange 3' as being disc-shaped, they may also be elliptical, or regular polygonal, preferably hexagonal. In that case, it is preferable that the head flange 3 and the middle flange 3' are adjusted so that they do not shift relative to each other.

[0059] As shown in Figure 4(a), the flanged anchor bolt 1 may have an intermediate nut 7'a between the head flange 3 and the middle flange 3', which is screwed onto the male thread of the bolt portion 4 and has a thickness of the distance W1 between the head flange 3 and the middle flange 3', thereby tightening the head flange 3 and the middle flange 3', respectively. 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 fastening material. It is preferable that the head flange 3 and the intermediate nut 7'a, and the middle flange 3' and the intermediate nut 7'a are tightened together.

[0060] The flanged anchor bolt 1 may be configured such that, as shown in Figure 4(b), the bolt portion 4 passes through the head flange portion 3 and the middle flange portion 3', and an intermediate pipe 7" with a thickness equal to the distance W1 between the head flange portion 3 and the middle flange portion 3' is provided, thereby adjusting the distance W1 between the head flange portion 3 and the middle flange portion 3'. It is preferable that the intermediate pipe 7" does not obstruct the passage of the fastening material through the through holes 8a, 8b, 8'a, and 8'b.

[0061] Another embodiment of the flanged anchor bolt 1, as shown in Figure 4(c), may be such that the head flange portion 3 is fastened with a head nut 7 on the bolt head end side 2 and an intermediate nut 7' on the bolt tip side 5 of the bolt portion 4, and / or the middle flange portion 3' is fastened with a middle inner nut 9 on the bolt head end side 2 and a middle outer nut 9' on the bolt tip side 5 of the bolt portion 4. It is preferable that these nuts 7, 7', 9, and 9' do not obstruct the passage of fastening material through the through holes 8a, 8b, 8'a, and 8'b.

[0062] In Figures 2 and 4, washers may be placed between these nuts and the head flange 3 and / or the middle flange 3' (not shown).

[0063] Figures 1 to 4, represented by Figure 1(a), show an example of using a flanged anchor bolt 1 by inserting it into an anchor installation hole 10 drilled perpendicular to a horizontal slope. However, as shown in Figure 5(a), the flanged anchor bolt 1 may also be installed by inserting it into an anchor installation hole 10 drilled perpendicular to an inclined slope 30 and fixing it with a fastening material 11, while the head flange 3 and the middle flange 3' are positioned along the slope. This ensures that the axis of the bolt portion 4 does not shift from the perpendicular direction even on an inclined surface.

[0064] When using flanged anchor bolts 1, as shown in Figure 5(a), the flanged anchor bolts 1 can be inserted into anchor installation holes 10 drilled perpendicular to the vertical slope 30 (i.e., horizontally), and fixed with a fastening material 11, while the head flange 3 and the middle flange 3' are positioned vertically. This ensures that even in horizontally drilled anchor installation holes 10, the flanged anchor bolts 1 can be installed without the axis of the bolt portion 4 shifting from the horizontal direction.

[0065] When using a flanged anchor bolt 1, as shown in Figure 6(a), the flanged anchor bolt 1 may be inserted into an anchor installation hole 10 which is drilled perpendicular to the horizontal slope 30a and into which a fixing material 11 has been injected. While the fixing material 11 is hardened and fixed, the opening of the anchor installation hole 10 may be covered and sealed with a cover 21 which is screwed onto and / or passes through the bolt portion 4 of the flanged anchor bolt 1.

[0066] When using a flanged anchor bolt 1, as shown in Figure 6(b), the flanged anchor bolt 1 is inserted into an anchor installation hole 10 which is drilled vertically downward from the inclined slope 30b and into which a fixing material 11 is injected. While the fixing material 11 hardens and fixes the bolt, the opening of the anchor installation hole 10 is covered with a bendable cover 22 which is screwed onto and / or passes through the bolt portion 4 of the flanged anchor bolt 1, and the cover 22 may be folded to match the slope of the slope 30b.

[0067] When using flanged anchor bolts 1, as shown in Figure 6(b), the flanged anchor bolts 1 are inserted into anchor installation holes 10 that are drilled perpendicular to the horizontal slope 30a and into which the fixing material 11 has been injected, and the fixing material 11 is hardened to secure them. Alternatively, a pipe with a diameter approximately the same as or slightly smaller than the inner diameter of the anchor installation hole 10 and a length that will be the same height as the slope 30a after being pushed in may be pushed into an anchor installation hole 10 that is drilled vertically downward from the inclined slope 30b and into which the fixing material 11 has been injected, and if necessary, more fixing material 11 is injected into the pipe 24 until it is full, the flanged anchor bolts 1 are inserted into the pipe 24, and the fixing material 11 is hardened to secure them. The pipe 24 may be provided with a cover 23 at its opening.

[0068] As shown in Figure 7, the flanged anchor bolt 1 may have a bolt portion 4 threaded so that a portion of the bolt head end 2, for example about half the length, becomes a male thread, and the bolt tip end 5 may be shaped so that it can be exposed from the anchor installation hole 10 after insertion, in accordance with the subsequent installation details of the post-construction anchor method.

[0069] As shown in Figure 8, the flanged anchor bolt 1 has multiple bolt portions 8a to 8d, preferably four, provided symmetrically, preferably point-symmetrically, line-symmetrically, or at equal intervals, on the head flange portion 3, or through holes 8a to 8d provided symmetrically, preferably point-symmetrically, line-symmetrically, or at equal intervals between adjacent bolt portions 8a to 8d.

[0070] The flanged anchor bolt 1 is used in post-installed anchoring methods as follows:

[0071] First, the building, structure, building materials, ground, or bedrock to be post-constructed is excavated, scraped, gouged, and / or hollowed out to form anchor installation holes 10, or is prepared in advance to form anchor installation holes 10. For example, a hole saw is used with a cylindrical drill, and the cylindrical core is broken up and removed with a chisel or the like to form the anchor installation holes 10 (anchor installation hole formation process).

[0072] As shown in Figure 9(a), the uncured hydraulic composition, which is the adhesive, is brought into contact with water in an adhesive capsule sealed in a permeable cylindrical container, causing the hydraulic composition to absorb water and coagulate (coagulation step).

[0073] As shown in Figure 9(b), the aggregated hydraulic composition is removed from the permeable cylindrical container and placed into a cylinder cartridge having a nozzle at the tip and an opening at the base. Then, as shown in Figure 9(c), it is stirred as necessary, and as shown in Figure 9(d), a lid that moves towards the nozzle inside the cylinder cartridge in response to pressure is inserted through the opening (injection preparation step).

[0074] As shown in Figure 9(e), the lid is pressed to push the hydraulic composition out from the nozzle, and the hardening paste, which is a mixture of the hardening composition and water, is discharged into the anchor installation hole 10 and injected as a fixing material 11 (injection step).

[0075] As shown in Figure 1(a), the flanged anchor bolt 1 is inserted into the anchor installation hole 10 such that the bolt portion is exposed from the anchor installation hole 10 at the bolt tip side 5 (insertion step).

[0076] After embedding the bolt head and flange 3 together into the fixing material 11, the fixing material 11 is allowed to cure and harden. As a result, the flanged anchor bolt 1, including the flange 3 at the head and the bolt portion 4 at the end 2 of the bolt head, is embedded, while the bolt portion 4 at the tip 5 of the bolt remains exposed from the anchor installation hole 10, thus fixing and securing it (fixing process). This completes the post-installed anchor method.

[0077] If necessary, post-construction work is performed on the bolt portion 4 exposed through the anchor installation hole 10 (post-construction process).

[0078] The adhesive may be an inorganic adhesive such as cement or mortar that has hardened, or an organic adhesive such as a curable resin or curable composition that has hardened.

[0079] An example of an unhardened adhesive that hardens to become a binder is a hydraulic composition containing a hydraulic component including Portland cement, alumina cement, and a rapid setting agent, a viscosity modifier, a setting modifier, and fine aggregate.

[0080] The content of Portland cement, alumina cement, quick-setting agent, viscosity modifier, setting modifier, and fine aggregate in the hydraulic composition is preferably in mass ratios of 20-60:30-70:10-40:0.1-1.0:1-10:10-40, more preferably 20-50:30-60:20-40:0.1-0.8:1-8:10-30, and even more preferably 20-40:30-50:20-30:0.1-0.5:1-5:15-30.

[0081] For example, using Portland cement as a reference, it is preferable that the ratio of alumina cement:accelerating agent:viscosity modifier:setting agent:fine aggregate is 30-70:10-40:0.1-1.0:1-10:10-40 parts by mass per 20, 30, 40, 50, or 60 parts by mass of Portland cement, more preferably 30-60:20-40:0.1-0.8:1-8:10-30 parts by mass, and even more preferably 30-50:20-30:0.1-0.5:1-5:15-30 parts by mass.

[0082] When alumina cement is used as a reference, it is preferable that the ratio of Portland cement:accelerating agent:viscosity modifier:setting agent:fine aggregate to 30, 40, 50, 60, or 70 parts by mass of alumina cement is 20-60:10-40:0.1-1.0:1-10:10-40 parts by mass, more preferably 20-50:20-40:0.1-0.8:1-8:10-30 parts by mass, and even more preferably 20-40:20-30:0.1-0.5:1-5:15-30 parts by mass.

[0083] When using the rapid setting agent as a reference, it is preferable that the ratio of Portland cement:alumina cement:viscosity modifier:setting agent:fine aggregate is 20-60:30-70:0.1-1.0:1-10:10-40 parts by mass of 10, 20, 30, or 40 parts by mass of the rapid setting agent, more preferably 20-50:30-60:0.1-0.8:1-8:10-30 parts by mass, and even more preferably 20-40:30-50:20-30:0.1-0.5:1-5:15-30 parts by mass.

[0084] When using the viscosity modifier as a reference, the ratio of Portland cement:alumina cement:rapid setting agent:setting agent:fine aggregate is preferably 20-60:30-70:10-40:0.1-1.0:1-10:10-40 parts by mass per 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0 parts by mass of the viscosity modifier, more preferably 20-50:30-60:20-40:1-8:10-30 parts by mass, and even more preferably 20-40:30-50:20-30:0.1-0.5:1-5:15-30 parts by mass.

[0085] When using the setting regulator as a reference, it is preferable that the ratio of Portland cement:alumina cement:rapid setting agent:viscosity modifier:fine aggregate is 20-60:30-70:10-40:0.1-1.0:10-40 parts by mass per 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 parts by mass of the setting regulator, more preferably 20-50:30-60:20-40:0.1-0.8:10-30 parts by mass, and even more preferably 20-40:30-50:20-30:0.1-0.5:1-5:15-30 parts by mass.

[0086] When using fine aggregate as a reference, it is preferable that, per 10, 15, 20, or 30 parts by mass of fine aggregate, the ratio of Portland cement:alumina cement:rapid setting agent:viscosity modifier:setting agent is 20-60:30-70:10-40:0.1-1.0:1-10 parts by mass, more preferably 20-50:30-60:20-40:0.1-0.8:1-8 parts by mass, and even more preferably 20-40:30-50:20-30:0.1-0.5:1-5 parts by mass.

[0087] Fine aggregate reduces shrinkage that occurs when the curable paste hardens after setting, preventing crack formation in the hardened body. It also mitigates the heat generated by the hydration reaction of the hydraulic components, suppressing the temperature rise of the curable paste and preventing excessive fluidity increase and prolonged setting time. The fine aggregate is selected from sands such as silica sand, river sand, sea sand, and crushed sand; inorganic materials such as alumina clinker, silica powder, and limestone; and at least one of crushed urethane, EVA (ethylene vinyl acetate) foam, and foamed resin, with silica sand being preferred.

[0088] It is preferable that the fine aggregate does not contain coarse particles larger than 1 mm. Specifically, it is preferable that the particle size classification conforming to Table 3 of JIS G5901 (2016) be 4 to 8, more preferably 5 to 8, and even more preferably 5 to 7. By having the particle size classification of the fine aggregate within this range, coarse particles larger than 1 mm can be excluded. The specific particle size distribution in this classification is 600 to 1180 μm for 4.5, 425 to 850 μm for 4.5, 300 to 600 μm for 5, 212 to 425 μm for 5.5, 150 to 300 μm for 6, 106 to 212 μm for 6.5, 75 to 150 μm for 7, 53 to 106 μm for 7.5, and 38 to 75 μm for 8.

[0089] The particle size classification is determined by using sieves with three different nominal mesh openings. The mass ratio of fine aggregate on the surface of each sieve to the total mass of the fine aggregate sample is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more.

[0090] Furthermore, the hydraulic composition contains 10 to 40 parts by mass, preferably 10 to 30 parts by mass, and more preferably 15 to 30 parts by mass, of fine aggregate. The fine aggregate content within 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 to 33% by mass, relative to the entire hydraulic composition. In this way, the fine aggregate is fine-grained 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, so that the aggregation of the hydraulic composition is not inhibited. If the particle size, content, and content of the fine aggregate exceed the above upper limits, the hydraulic components and fine aggregate will separate during construction using the curable paste, and the hardened body will not be able to exhibit the desired strength.

[0091] Viscosity modifiers include, for example, thickeners, and more specifically, natural polysaccharide derivatives that may contain methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, and carboxymethylcellulose, as well as at least one of these; acrylamide; starch ethers; and polymer electrolytes. Any of these may be used individually or in combination.

[0092] Examples of such thickening agents and viscosity modifiers include commercially available methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, and carboxymethylcellulose, as well as acrylamide, starch ethers, and polymer electrolytes. Examples include ESAMID HP (manufactured by Lamberti SPA), a natural polysaccharide derivative, and 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.).

[0093] Furthermore, the polymer electrolyte is not particularly limited as long as it has a dissociation group in the main chain or side chain of the polymer chain and dissociates in water to become a polymer ion. For example, polymer ions having polymer chains of hydrocarbon, etheric, or aminoic groups, aromatic, heterocyclic, aromatic, amide, and / or organic acid systems that have at least one of the dissociation groups such as carboxyl groups, sulfonic acid groups, phosphoric acid, phosphorous acid or salts thereof, or aliphatic, aromatic, or heterocyclic amino groups or their hydrochloride or sulfate salts, or organic acidic acid salts such as organic acid, alkali metal salts or alkaline earth metal salts, or first to quaternary ammonium groups or organic ammonium groups. Specifically, natural products include alginic acid and its salts, pectin (polygalacturonic acid) or its salts, carboxymethylcellulose or its salts, proteins or polypeptides. Examples of synthetic polymer compounds include polyacrylic acid or its salts, such as sodium polyacrylate; polystyrene sulfonic acid or its salts, such as sodium polystyrene sulfonate; poly(allylamine) or its hydrochloride salts; quaternized poly(vinylpyridine) or its salts; anionic polyacrylamides such as poly(acrylamide / sodium acrylate) copolymers and poly(acrylamide-2-methyl-1-propanesulfonate sodium); anionic group-containing cyclic repeating unit polymers such as poly(diallyldimethylammonium chloride); perfluoroalkyl sulfonic acid polymers such as Nafion (a trade name of Sigma-Aldrich); semi-aromatic ammonium lonenes; aliphatic ammonium; heterocyclic ammonium lonenes; and alkyl ethers. Examples of ammonium lonenes and free radical-containing polymer compounds include STARVIS 308F (a trade name of BASF Japan), Duramax, Tamol, Romax, and Dowex (all trade names of Dow Chemical), Acusol and Acumer (all trade names of Rohm & Haas), and Dispex and Magnafloc (all trade names of BASF).

[0094] When a hydraulic composition contains a viscosity modifier, mixing the hydraulic composition with water to form a hardening paste allows for a balance between appropriate fluidity for easy injection into boreholes and appropriate viscosity to prevent leakage when injected into upward-facing boreholes, thereby achieving both effects. Furthermore, the viscosity modifier gives the hardening paste excellent wettability, allowing it to adhere to fine aggregates and increase fluidity. This also makes it easier for the fine aggregates to penetrate the irregularities of the inner surface of the borehole and the anchor elements, causing them to harden while remaining trapped. As a result, when the hardening paste is injected into a borehole and anchor elements such as reinforcing bars are driven in, the anchor elements become less likely to come loose and can be firmly fixed in place.

[0095] In the hydraulic composition, the viscosity modifier, which is a thickening agent, is contained in an amount of 0.1 to 1.0 parts by mass, preferably 0.1 to 0.8 parts by mass, and more preferably 0.1 to 0.5 parts by mass. If the content exceeds this upper limit, the extrusion resistance from the curable paste pack increases significantly, and a cured body with sufficient strength cannot be obtained. On the other hand, if the content is below the lower limit, the viscosity of the curable paste will be insufficient.

[0096] In a hydraulic composition, the setting regulator is, for example, a setting time regulator, which adjusts the length of the setting time from the initial setting, when the curable paste loses fluidity, to the final setting, when it begins to harden. The setting regulator adsorbs to the particles of the hydraulic component in the curable paste and coats their surface, suppressing contact between the hydraulic component and water. This allows the hydration reaction of the hydraulic component to proceed gradually, preventing the curable paste from setting too quickly. Examples of setting time regulators include oxycarboxylic acids such as citric acid, gluconic acid, tartaric acid, malic acid, salicylic acid, m-oxybenzoic acid, and p-oxybenzoic acid, as well as their salts; inorganic carbonates; ligninsulfonic acid or its salts; and sugar alcohols such as sorbitol, pentitol, and hexitol. One or more of these can be used. The setting time modifier may be alkali metal salts such as lithium, potassium, and sodium salts of carbonic acid, oxycarboxylic acid, or ligninsulfonic acid, as well as alkaline earth metal salts such as magnesium and calcium salts. Among these, sodium citrate, lithium carbonate, potassium carbonate, and fumed silica (for example, Aerosil (a trade name of Nippon Aerosil Co., Ltd.), which also acts as a strength enhancer) are preferred, and a combination of one or more of trisodium citrate, lithium carbonate, and potassium carbonate is more preferred.

[0097] This hydraulic composition, when containing a setting regulator, prevents heat generation during mixing with water, thus preventing expansion, cracking during cooling, or hardening of the curable paste. It also delays hardening, making it difficult to harden until the curable paste is injected into the borehole, but it hardens rapidly once injected and cured. Furthermore, it eliminates the need for a delay-type fluidizer.

[0098] In the hydraulic composition, the setting time regulator is contained 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 excessively long, and separation of the hydraulic components and fine aggregate occurs before the setting is completed. On the other hand, if the content is below this lower limit, the hydration reaction of the hydraulic components proceeds rapidly, and the hardening paste hardens immediately after the initial setting, causing cracks to form in the hardened body, impairing its appearance, and allowing water to leak through the cracks even when used as a waterproofing material.

[0099] The hydraulic component of the hydraulic composition is an M-type expansive cement that includes Portland cement, alumina cement, and a rapid-setting agent as essential components. Portland cement mainly consists of silica (SiO2) and calcia (CaO), for example, containing 20-25% by mass of silica and 60-70% by mass of calcia. In addition, it contains 1-6% by mass each of alumina (Al2O3), magnesia (MgO), and iron oxide (Fe2O3). These components exist, for example, as calcium silicate, calcium aluminate, and calcium aluminoferrite.

[0100] Examples of Portland cement include ordinary Portland cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, moderate-heat Portland cement, sulfate-resistant Portland cement, and white Portland cement. Among these, rapid-hardening Portland cement is preferred. Only one type of Portland cement may be used, or multiple types may be mixed and 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.

[0101] Alumina cement is a special cement whose main component is calcium aluminate (CaO·Al2O3), and examples include those containing 20-40% by mass of calcia and 40-80% by mass of alumina. In the hydraulic composition, the alumina cement is contained in an amount of 30-70 parts by mass, preferably 30-60 parts by mass, and more preferably 30-50 parts by mass.

[0102] Portland cement and alumina cement are finely powdered cement powders, preferably with an average particle size of 10 to 50 μm, more preferably 20 to 40 μm, and even more preferably 20 to 30 μm. The average particle size refers to the volume-based distribution measured by laser diffraction and scattering. An example of a device for measuring such an average particle size is the Shimadzu laser diffraction particle size distribution analyzer SALD-3100-WJA1:V1.00 (manufactured by Shimadzu Corporation). Because the cement powder is such a fine powder, chemical coagulation due to hydration of the cement powder caused by water absorption and physical coagulation due to the surface potential of the cement powder are more likely to occur. As a result, due to chemical coagulation, physical coagulation, or a synergistic effect of both, the hardening paste injected into cracks in the ceiling or walls of concrete structures, for example, is less likely to leak out.

[0103] Examples of rapid setting agents 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 anhydrous gypsum (CaSO4), hemihydrate gypsum (CaSO4·1 / 2H2O), and dihydrate gypsum (CaSO4·2H2O) are preferred from the viewpoint of increasing the amount of ettringite produced, which will be described later. These rapid setting agents may be used individually or in a mixture of multiple types. The hydraulic composition contains 10 to 40 parts by mass, preferably 20 to 40 parts by mass, and more preferably 20 to 30 parts by mass of the rapid setting agent.

[0104] Hydraulic compositions preferably do not contain retarding fluidizers. However, they may contain strength enhancers. Strength enhancers include silica powders such as silica fume, blast furnace slag powder and / or fly ash, which are silica fine particles, and kaolin (kaolin containing silica and alumina, calcined kaolin, etc.). Retarding fluidizers include sulfonic acid-based fluidizers 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; and carboxylic acid-based fluidizers such as polycarboxylic acids and salts thereof.

[0105] As time passes, the hardening paste undergoes a hydration reaction of its hydraulic components, causing it to set and then harden. Specifically, the reaction between calcium aluminate, gypsum, and water in the alumina cement proceeds to produce ettringite (3CaO·Al2O3·3CaSO4·32H2O), which is calcium aluminate sulfate hydrate. Furthermore, as the gypsum, which acts as a rapid setter, is consumed, the ettringite reacts with the calcium aluminate (aluminate phase) in the alumina cement to produce monosulfate hydrate. Calcium sulfoaluminate hydrates such as ettringite and monosulfate hydrate are bulky, water-insoluble needle-shaped crystals, and as they grow, the hardening paste expands and sets, gradually hardening. Moreover, the gypsum, which acts as a rapid setter, becomes a source of calcium sulfate, increasing the amount of ettringite produced and forming a high-strength hardened body.

[0106] The hardening paste contains calcium hydroxide (Ca(OH)2), which is formed when calcia in alumina cement is dissolved in water. Silica fume and kaolin, contained in the strength enhancers, undergo a so-called pozzolanic reaction with this calcium hydroxide, producing water-insoluble hydrates. This results in the formation of fine, dense crystals of, for example, calcium silicate hydrate (3CaO·2SiO2·3H2O) or calcium aluminate hydrate (3CaO·Al2O3·6H2O), which harden the hardening paste to high strength. In particular, compared to blast furnace slag, which is powdered by crushing, and fly ash, which is coal ash and therefore forms relatively large spherical particles, the particles of calcined kaolin are finer and have a large surface area per unit mass. Therefore, silica fume and calcined kaolin have far higher pozzolanic activity than other siliceous powders, producing dense hydrate crystals and imparting high compressive strength to the hardened body.

[0107] Thus, because the hydraulic composition contains alumina cement, a rapid setting agent such as gypsum, and a strength enhancer mainly composed of kaolin, its hardened material exhibits rapid strengthening, developing high strength within a few hours to a day after application.

[0108] In parallel with the formation of ettringite and the pozzolanic reaction, the hydration reaction of calcium silicate in Portland cement proceeds, producing hardened calcium silicate hydrate bodies such as tobermorite crystals. As a result, the hydration reaction of calcium silicate is slower than that of calcium aluminate, and therefore Portland cement excels at maintaining high strength over long periods, such as 7 days to several months after construction. [Examples]

[0109] The following describes examples to which the present invention is applied, as well as comparative examples to which the present invention is not applied.

[0110] (Example 1) As shown in Figure 1(a), a flanged anchor bolt 1 was used, consisting of a bolt portion 4 made of chromium-molybdenum steel with a diameter of 10 mm and a length of 250 mm, with a male thread on the surface, and a head flange portion 3 with a diameter of 46 mm, a thickness of 6 mm, and through holes 8a and 8b with a diameter of 7 mm.

[0111] (Example 2) As shown in Figure 3(a), a flanged anchor bolt 1 was used, consisting of a bolt portion 4 made of chromium-molybdenum steel with a diameter of 10 mm and a length of 250 mm, with a male thread on the surface, and a head flange portion 3 and a middle flange portion 3' with a diameter of 46 mm and a thickness of 6 mm, and having through holes 8a, 8b and 8'a, 8'b with a diameter of 7 mm, spaced 8 mm apart as a distance W1.

[0112] (Comparative Example 1) A conventional anchor bolt was used, consisting of a rod with a diameter of 10 mm and a length of 250 mm, with a male thread attached to its surface.

[0113] The post-installed anchoring method was simulated using the flanged anchor bolt 1 of the example and the anchor element of the comparative example, and an adhesion strength measurement test was conducted as follows.

[0114] (Formation of anchor installation holes) Using a hole saw drill (Shibuya Light Bit manufactured by Shibuya Co., Ltd.) in a test concrete block, a hole was drilled, and the cylindrical core was broken up and removed with a chisel to form an anchor installation hole 10 with a diameter of 50 mm and a depth of 50 mm.

[0115] (Preparation of hydraulic compositions) As raw materials, 30 parts by mass of rapid-hardening Portland cement (manufactured by Ube Mitsubishi Cement Co., Ltd.), 50 parts by mass of alumina cement (manufactured by Denka Co., Ltd., molten alumina cement No. 1), 28 parts by mass of a rapid-setting agent (gypsum, manufactured by Noritake Co., Ltd., hemihydrate gypsum β-type SB), 0.2 parts by mass of STARVIS 308F (product name of BASF Japan Ltd.) as a viscosity modifier, 1.8 parts by mass of tartaric acid as a setting modifier, and 25 parts by mass of silica sand No. 7 (product name of Nichihyo Mining Co., Ltd.) as fine aggregate were added to a mixer and stirred to prepare a hydraulic composition.

[0116] (Preparation of adhesive capsules) 450g of hydraulic composition, basis weight 40g / m² 2 The adhesive capsules for the example and comparative example, measuring 300 mm in length and 34 mm in diameter, were then sealed in a water-permeable cylindrical container made of nonwoven sheet material from heat-stretched paper. These capsules were then immersed in tap water at 20°C for 5 minutes.

[0117] (Adhesion strength test) The permeable cylindrical container of the adhesive capsule was broken open, and the aggregated, uncured adhesive was removed and placed into a cylinder cartridge having a capped tip and an opening at the base. Using a stirring rod (manufactured by Fujiwara Sangyo Co., Ltd., product name: Paint Mixer SPM-4) with a stirring blade at the tip of the rotating rod, the base end was connected to an electric impact driver, which is a rotating tool, the stirring blade was inserted into the cylinder cartridge through the opening and stirred for 10 seconds to disperse the aggregated, uncured adhesive within the cylinder cartridge and prepare a curable paste-like adhesive. This curable paste-like adhesive 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 inserted into the anchor installation holes 10, respectively. The bolt heads were then embedded in a hardening paste-like adhesive so that 20 cm of the bolt portion 4 was exposed at the bolt tip end 5. The adhesive was then cured for 7 days in accordance with JIS A1108 (2006) to allow it to harden and adhere. For the adhesion strength test, a tensile testing machine equipped with a hydraulic pump, a hydraulic jack connected to the hydraulic pump that pulls the anchor bolt out of the test concrete block using the hydraulic pressure generated by the hydraulic pump, a load cell that measures the load generated by the hydraulic jack, and a displacement gauge that measures the displacement of the anchor bolt was used to perform the adhesion strength test. The results are shown in Table 1.

[0118] [Table 1]

[0119] As is clear from Table 1, the adhesion strength was more than twice as strong when using flanged anchor bolts 1 in Examples 1 and 2 compared to the conventional rod-shaped bolts used in Comparative Example 1. [Industrial applicability]

[0120] The flanged anchor bolt of the present invention, and the post-construction anchor method using the same, are used in reinforcement work to improve shear strength in order to enhance the seismic strength and durability of existing concrete structures such as culverts, dam bodies, tunnels, and buildings; in installation work to connect other building materials to these structures or buildings during construction or after the fact; and in construction work to attach structures such as rockfall protection nets and avalanche prevention fences to so-called reinforced concrete that covers the slopes of the ground and rock to prevent collapse. [Explanation of symbols]

[0121] 1 is a flanged anchor bolt, 2 is the bolt head end, 3 is the head flange, 3' is the middle flange, 4, 4a, 4b, 4c, 4d are the bolt section, 5 is the bolt tip, 6, 6' are the screw holes, 7 is the head nut, 7', 7'a are the intermediate nuts, 7" is the intermediate pipe, the through holes are 8a, 8b, 8'a, 8'b, 8c, 8d, 9 is the middle inner nut, 9' is the middle outer nut, 10 is the anchor installation hole, 11 is the fastening 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 W1, W2 are the distance between the head flange and the middle flange.

Claims

1. A flanged anchor bolt used for insertion into an anchor installation hole and for embedding and fixing in a fastening material filled in the anchor installation hole, The bolt has a rod-shaped bolt portion with a length that can be exposed from the anchor installation hole at the tip side, with at least the side near the bolt head being a male thread, and a head flange portion that is provided closer to the center and expands from near the bolt head, expanding to 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. The entire side surface of the bolt portion is a male thread. A screw hole is provided closer to the center of the bolt, which is a female screw that screws into the male screw, expanding from the middle of the bolt portion while moving away from the head flange portion on the bolt tip side than the head flange portion, and has a middle flange portion that is smaller in diameter than the anchor installation hole and is embedded in the fixing material within the anchor installation hole. A flanged anchor bolt characterized by the following features.

2. The flanged anchor bolt according to claim 1, characterized in that the screw hole is provided in the center of the flange portion of the head.

3. The flanged anchor bolt according to claim 1, characterized in that the head flange is disc-shaped, elliptical, or regular polygonal.

4. The flanged anchor bolt according to claim 1, characterized in that the screw hole penetrates or does not penetrate the head flange.

5. The flanged anchor bolt according to claim 1, characterized in that the head flange has a through hole opened in the head flange along the longitudinal direction.

6. The flanged anchor bolt according to claim 1, characterized in that the intermediate nut is screwed onto the male screw on the bolt tip side of the head flange and tightens the head flange.

7. The flanged anchor bolt according to claim 1, characterized in that the bolt portion is a hexagonal bolt, button head bolt, eye bolt, or wing bolt at the bolt head.

8. The flanged anchor bolt according to claim 1, characterized in that the screw hole penetrates the head flange, the male screw protrudes through the head flange at the bolt head end, and the head nut screws onto the male screw at the bolt head end side of the head flange, thereby tightening the head flange.

9. The flanged anchor bolt according to claim 1, characterized in that the middle flange portion has the same diameter as the head flange portion.

10. The flanged anchor bolt according to claim 1, characterized in that the middle flange portion has a through hole opened along the longitudinal direction.

11. The flanged anchor bolt according to claim 1, characterized in that an intermediate nut, which is screwed onto the male screw, is provided between the head flange and the middle flange, thereby tightening the head flange and the middle flange, respectively.

12. The flanged anchor bolt according to claim 10, characterized in that the cylindrical pipe into which the bolt portion is inserted is provided between the head flange portion and the middle flange portion.

13. The flanged anchor bolt according to claim 1, characterized in that the bolt portion has a diameter of 8 mm to 100 mm, and the flange portion of the head is wider in diameter, with a diameter of 20 mm to 510 mm.

14. The flanged anchor bolt according to claim 1, characterized in that the anchor installation hole has a diameter of 22 mm to 512 mm, and the flange portion of the head has a smaller diameter, with a diameter of 20 mm to 510 mm.

15. The flanged anchor bolt according to claim 1, characterized in that a plurality of the bolt portions are provided on the head flange portion in a point-symmetrical manner, a line-symmetrical manner, or at equal intervals.

16. The flanged anchor bolt according to claim 1, characterized in that a cover that covers and seals the opening of the anchor installation hole is screwed onto and / or passes through the bolt.

17. Anchor holes are made in buildings, structures, building materials, ground, or bedrock. Inject the fixing material into the anchor installation hole, A post-installed anchoring method characterized by inserting the flanged anchor bolt described in claim 1 into the anchor installation hole, such that the bolt portion is exposed from the anchor installation hole at the tip of the bolt, and embedding the bolt head together with the fixing material.

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