Method of installing post-installed anchor

Abstract

To enable the dense filling of a grout material, to eliminate the remaining of a member in a building frame, and to save the labor of construction work.SOLUTION: A construction method of a post-installed anchor includes forming a prepared hole 2 in a surface of an existing structure, inserting an anchor 3 into the prepared hole 2, sealing an opening of the prepared hole 2 with a sealing material 4, and injecting a grout material 9 into the prepared hole 2 from a grout injection tube 8 penetrating the sealing material 4 and having a tip portion inserted into the prepared hole 2 while discharging air in the prepared hole 2 from an air vent tube 6 penetrating the sealing material 4 and having a tip portion inserted into the prepared hole 2. A flange part 11 enlarging the outside diameter is provided on the tip part on the side inserted into the prepared hole 2 of the air vent tube 6, and after confirming that the prepared hole 2 is filled with the grout material 9, the air vent tube 6 is pulled out until the flange part 11 abuts on the seal material 4, and the grout material 9 is cured in this state.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for installing a post-installed anchor for installing a downward or lateral anchor on the underside or side of an existing concrete structure. [Background technology]

[0002] A known construction method for fixing anchors to the underside or side of an existing concrete structure is disclosed in Patent Document 1 below (see FIG. 8), in which grout material 51 is injected into pilot holes 50 formed in the surface of the structure (FIG. 8(A)), and then anchor 52 is inserted into the axial center of the pilot hole into which the grout material has been injected, and anchor 52 is fixed and held in place until grout material 51 hardens (FIG. 8(B)).

[0003] Another construction method, as disclosed in Patent Document 2 below (see FIG. 9), involves drilling a pilot hole 50 in the surface of an existing structure, inserting an anchor 52 into the pilot hole 50, and sealing the opening of the pilot hole 50 with a sealant 53 (FIG. 9(A)). Then, while venting air from the pilot hole 50 through an air vent pipe 54 having its tip inserted into the pilot hole 50 and penetrating the sealant 53, grout 51 is injected into the pilot hole 50 through a grout injection pipe 55 having its tip inserted into the pilot hole 50 and penetrating the sealant 53 (FIG. 9(B)). After the grout 51 filled in the pilot hole 50 hardens, the sealant 53 covering the opening of the pilot hole 50 is removed, and the air vent pipe 54 and the grout injection pipe 55 protruding from the hardened grout 51 are cut off (FIG. 9(C)). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-54727 [Patent Document 2] Japanese Patent Application Publication No. 10-102600 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the construction method shown in Figure 8, when pilot holes 50 are formed facing downward on the underside of a structure, it is necessary to use high-viscosity grout material 51 to prevent dripping when injected into pilot holes 50. However, high-viscosity grout material 51 does not blend well with anchors 52 that are inserted later, creating air spaces around anchors 52, making it difficult for grout material 51 to adhere to anchors 52. In addition, air bubbles are easily trapped in grout material 51, and there is no way to expel these air bubbles, making it difficult to pack the grout densely.

[0006] 9 has the drawback that the air vent pipe 54 and grout injection pipe 55 remain inside the skeleton. Although rust-resistant materials such as stainless steel or copper are used for these air vent pipes 54 and grout injection pipes 55, the pipes remaining inside the skeleton also oxidize as the skeleton deteriorates, and this oxidation of the pipes accelerates deterioration of the skeleton and poses the risk of the air vent pipe 54 and grout injection pipe 55 falling.

[0007] Furthermore, in the construction method shown in Figure 9, after the grout material 51 hardens, the air vent pipe 54 and the grout injection pipe 55 must be cut, which is a time-consuming cutting operation, and also requires scraping work and painting finishing work after cutting, which increases the workload.

[0008] Therefore, the main object of the present invention is to provide a method for installing post-installed anchors that enables dense filling of grout material, eliminates the need for any components remaining inside the structure, and reduces the labor required for installation. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention according to claim 1 provides a method for installing a post-installed anchor, which comprises forming a pilot hole in the surface of an existing structure, inserting an anchor into the pilot hole, sealing the opening of the pilot hole with a sealant, and injecting grout into the pilot hole from a grout injection tube whose tip has been inserted into the pilot hole and penetrated through the sealant, while venting air from the pilot hole from an air vent tube whose tip has been inserted into the pilot hole and penetrated through the sealant, a flange portion having an enlarged outer diameter is provided at a tip end of the air vent tube on the side inserted into the pilot hole to prevent the tube from falling off the sealing material, There is provided a method for installing a post-installed anchor, characterized in that after the grout material is discharged from the air vent tube and it is confirmed that the pilot hole has been filled with the grout material, the air vent tube is pulled out until the flange portion abuts against the sealing material, and the grout material is hardened in this state.

[0010] In the invention described in claim 1 above, the opening of the pilot hole is sealed with a sealant, and then grout material is injected into the pilot hole while the air in the pilot hole is discharged from the air vent tube, which penetrates the sealant and has its tip inserted into the pilot hole.Therefore, by filling the pilot hole with grout material that has excellent fluidity, the grout material can be filled densely into the pilot hole, and the fixing strength of the post-installed anchor can be increased.

[0011] Furthermore, after confirming that the pilot hole has been filled with grout, the air vent tube is pulled out until the flange abuts the sealing material, and the grout is allowed to harden in this state. Therefore, when the sealing material is removed after the grout has hardened, all of the air vent tube is removed along with the sealing material, and no air vent tube remains inside the structure. This eliminates the need for subsequent work such as cutting the air vent tube, thereby reducing the labor required for construction.

[0012] As a second aspect of the present invention, a flange portion having an enlarged outer diameter is provided at the tip of the grout injection tube on the side inserted into the prepared hole to prevent the grout injection tube from falling off the sealing material, There is provided a method for installing a post-installed anchor as described in claim 1, wherein, after it is confirmed that the grout material has been discharged from the air vent tube and the pilot hole has been filled with the grout material, the grout injection tube is pulled out until the flange portion abuts against the sealing material, and the grout material is hardened in this state.

[0013] In the invention described in claim 2, in order to prevent the grout injection tube from remaining inside the framework, similarly to the air vent tube, after it is confirmed that the pilot hole has been filled with grout, the grout injection tube is pulled out until the flange portion abuts the sealing material, and the grout material is allowed to harden in this state. As a result, the grout injection tube will no longer remain inside the framework, further reducing the labor required for construction work.

[0014] The present invention according to claim 3 provides the method for installing a post-installed anchor according to claim 1, in which a soft, flexible hose is used as the air vent tube.

[0015] In the invention described in claim 3 above, when pulling out the air vent tube, it may be difficult to pull it out vertically and straight in some places. In such cases, the air vent tube can be bent at will along the way and pulled, allowing it to be pulled out to the end.

[0016] The present invention according to claim 4 provides the method for installing a post-installed anchor according to claim 1, in which a transparent or translucent hose is used as the air vent tube.

[0017] In the invention described in claim 4 above, by using a transparent or translucent hose as the air vent tube, grout material is discharged from the air vent tube, making it possible to clearly visually determine that the pilot hole has been filled with grout material.

[0018] The present invention according to claim 5 provides a method for installing a post-installed anchor according to claim 1, wherein, after completing the injection of the grout material from the grout injection tube, the air vent tube and the grout injection tube are respectively closed so as to prevent the grout material from flowing out from the air vent tube and the grout injection tube.

[0019] In the invention described in claim 5 above, once the injection of grout material from the grout injection tube is completed, the air vent tube and the grout injection tube are closed by means of tying, plugging, bending, etc., to prevent the grout material injected into the pilot hole from leaking out.

[0020] The present invention according to claim 6 provides a method for installing a post-installed anchor as set forth in claim 2, wherein a recess is provided on the inner surface of the sealing material around the penetration portion of the air vent tube, into which the flange portion of the air vent tube can fit, and a recess is provided around the penetration portion of the grout injection tube, into which the flange portion of the grout injection tube can fit.

[0021] In the invention described in claim 6, when the pilot hole is filled with grout and the air vent tube and grout injection tube are pulled out until their flanges abut against the sealing material, the flanges fit into recesses provided around the penetrations on the inner surface of the sealing material, preventing the air vent tube and grout injection tube from remaining inside the skeleton. The surface of the sealing material and the end faces of the flanges of each hose are formed flat, so that when the sealing material is removed after the grout has hardened, the skeleton surface around the anchor is flat. This eliminates the need for scraping work after removing the sealing material, further reducing the labor required for construction work. [Effects of the Invention]

[0022] As explained above in detail, according to the present invention, it is possible to densely fill the grout material, no components remain inside the structure, and labor saving in construction work can be achieved. [Brief explanation of the drawings]

[0023] [Figure 1] This is a cross-sectional view showing the installation procedure (part 1) of a post-installed anchor. [Figure 2] This is a cross-sectional view showing the installation procedure (part 2) of post-installed anchors. [Figure 3] This is a cross-sectional view showing the installation procedure (part 3) of post-installed anchors. [Figure 4] This is a cross-sectional view showing the installation procedure (part 4) of post-installed anchors. [Figure 5] This is a cross-sectional view showing the installation procedure (part 5) of post-installed anchors. [Figure 6] This is a cross-sectional view showing the installation procedure (part 6) of post-installed anchors. [Figure 7] FIG. 10 is a cross-sectional view showing a modified example of the sealing material 4. [Figure 8] FIG. 1 is a cross-sectional view showing the installation procedure of a conventional post-installed anchor. [Figure 9] 10A and 10B are cross-sectional views showing the installation procedure of another conventional post-installed anchor. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0025] The installation method for post-installed anchors according to the present invention is particularly suited to embedding and fixing one end of an anchor 3 in a pilot hole 2 formed in the underside or side of an existing structure (concrete skeleton 1) so that when the opening is left open, grout injected inside will flow out of the opening and will not be able to fill the entire structure, as shown in Figure 1. Below, we will explain an example of a method for fixing an anchor 3 in a pilot hole 2 formed in the underside of concrete skeleton 1 so that it faces downward or sideways, but the method can also be applied to pilot holes 2 formed in other shapes.

[0026] As shown in Figures 1 to 3, the method of installing a post-installed anchor according to the present invention involves forming a pilot hole 2 in the surface of an existing structure (concrete body 1), inserting an anchor 3 into this pilot hole 2, sealing the opening of the pilot hole 2 with sealing material 4, and then discharging air from inside the pilot hole 2 through an air vent tube 6, the tip of which is inserted into the pilot hole 2 through a through hole 5 that passes through the sealing material 4, while injecting grout material 9 into the pilot hole 2 through a grout injection tube 8, the tip of which is inserted into the pilot hole 2 through a through hole 7 that passes through the sealing material 4.

[0027] In this way, with the opening of the pilot hole 2 sealed with the sealing material 4, the grout material 9 is injected into the pilot hole 2 while the air in the pilot hole 2 is discharged through the air vent tube 6. Therefore, by filling the pilot hole 2 with grout material 9 which has excellent fluidity, the pilot hole 2 can be densely filled with grout material 9, thereby increasing the fixing strength of the post-installed anchor.

[0028] The type of anchor 3 can be selected appropriately depending on the application, such as whether the anchor 3 is to be installed for attaching equipment or for earthquake reinforcement. For example, when used for attaching equipment, a fully threaded bolt is suitable as shown in the example, and when used for earthquake reinforcement, a deformed steel bar or the like is suitable. Alternatively, round steel bars or the like may be used.

[0029] The lower end of the anchor 3 is held by an anchor holding plate 13. The anchor holding plate 13 is fixed to a base installed on the floor surface or is suspended from the concrete skeleton 1 on the ceiling.

[0030] The sealing material 4 serves to close the opening of the pilot hole 2 and seal it so that the grout 9 injected into the pilot hole 2 does not leak out from the opening. Any material configured in this manner may be used, but it is preferably a disk member made of a resin such as epoxy resin or rubber. The sealing material 4 may be placed alone, but as shown in the illustrated example, it is preferable to place a reinforcing material 10 made of wood, resin, metal, or the like on its outer surface to prevent deformation due to the pressure of the grout injected into the pilot hole 2. The reinforcing material 10 is temporarily fixed to the surface of the concrete skeleton 1, anchors 3, or the like.

[0031] The sealing material 4 has an opening in the center through which the anchor 3 is inserted, and on both sides thereof, a through-hole 5 through which an air vent tube 6 passes and a through-hole 7 through which a grout injection tube 8 passes, which are formed in positions facing each other. When the reinforcing material 10 is laminated on the outer surface of the sealing material 4, through-holes communicating with the through-holes 5 and 7 are also formed in this reinforcing material 10 at the same positions.

[0032] As shown in Figure 1 and other figures, the air vent tube 6 is provided with a flange 11 with an enlarged outer diameter at the tip end on the side inserted into the pilot hole 2 in order to prevent the sealing material 4 from falling out of the through-hole 5. The flange 11 is formed in a ring shape by increasing the hose wall thickness all around the tip of the air vent tube 6. The edge of the air vent tube 6 on the side where the flange 11 is formed is formed flat with no irregularities from the outer edge of the tube opening to the outer edge of the flange 11.

[0033] The outer diameter D of the flange portion 11 is set to be approximately 1.1 to 2 times the outer diameter of the remaining tube portions. The thickness T of the flange portion 11 is preferably set to be approximately 1 to 10 mm. This prevents the air vent tube 6 from slipping out of the seal material 4 when the air vent tube 6 is pulled out and the flange portion 11 is brought into contact with the seal material 4.

[0034] The air vent tube 6 is made of a soft, flexible hose. Examples of the flexible hose that can be used include a soft vinyl chloride hose, a silicone hose, and a soft polyvinyl chloride (PVC) hose. By using a soft, flexible hose for the air vent tube 6, it may be difficult to pull the air vent tube 6 straight and vertically depending on the location. In such cases, the air vent tube 6 can be pulled out to the end by bending it as desired along the way and pulling it. Furthermore, by using a soft, flexible hose, the outer surface of the air vent tube 6 can more easily fit tightly against the through hole 5 of the sealing material 4, preventing leakage of the grout material 9 filled in the pilot hole 2.

[0035] The air vent tube 6 may be transparent, opaque, or translucent, but it is preferable to use a transparent or translucent one, more preferably a transparent one, since this makes it possible to clearly visually determine whether or not grout material has flowed inside.

[0036] 1, the grout injection tube 8 is provided with a flange portion 12 having an enlarged outer diameter at the tip end on the side inserted into the pilot hole 2 in order to prevent the sealing material 4 from dropping out of the through hole 7. The shape of this flange portion 12 and the material of the grout injection tube 8 provided with this flange portion 12 are the same as those of the air vent tube 6, and therefore a detailed explanation will be omitted.

[0037] The tip of the air vent tube 6 on the side inserted into the pilot hole is positioned at a location where air is most likely to remain in the pilot hole 2 immediately after the start of injection of the grout material 9 from the grout injection tube 8. That is, for example, when forming a downward pilot hole 2 on the underside of the concrete skeleton 1, the tip of the air vent tube 6 on the side inserted into the pilot hole is positioned near the bottom of the pilot hole 2, as shown in FIG.

[0038] In the installation method of the post-installed anchor according to the present invention, as shown in Figure 2, the air in the pilot hole 2 is discharged from the air vent tube 6 while the grout material 9 is injected into the pilot hole 2 from the grout injection tube 8, and as shown in Figure 3, once it has been confirmed that the grout material 9 has been discharged from the air vent tube 6 and the pilot hole 2 has been filled with the grout material 9, the air vent tube 6 is pulled out until the flange portion 11 abuts against the sealing material 4, and the grout material 9 is allowed to harden in this state, as shown in Figures 4 and 5.

[0039] After confirming that the pilot hole 2 has been filled with the grout 9, the air vent tube 6 is pulled out until the flange 11 abuts against the sealing material 4. Here, because the flange 11 is provided at the tip of the air vent tube 6 as described above, the air vent tube 6 will not fall off from the through-hole 5 of the sealing material 4 during the pulling out operation. When the flange 11 abuts against the sealing material 4, the air vent tube 6 becomes unable to be pulled out, completing the pulling out operation. To visually confirm that the flange 11 has abutted against the sealing material 4, a mark such as a scale or a protrusion may be provided on the circumferential surface of the air vent tube 6 extending below the sealing material 4 and the reinforcing material 10. Furthermore, because the grout 9 is cured with the flange 11 abutting against the sealing material 4, the flange 11 adheres tightly to the surface of the sealing material 4, sealing the gap between the through-hole 5 and the air vent tube 6 and preventing leakage of the grout 9 filled in the pilot hole 2.

[0040] 4, the air vent tube 6 is slowly withdrawn at a speed similar to the speed at which the grout material 9 is discharged from the air vent tube 6 while continuing to inject the grout material 9 from the grout injection tube 8. This prevents air bubbles from being mixed into the grout material 9 when the air vent tube 6 is withdrawn, and allows the grout material 9 to be densely filled.

[0041] When the flange portion 12 of the grout injection tube 8 is positioned so as to protrude upward away from the sealant 4 as shown in FIG. 4, the grout injection tube 8 is also pulled out until the flange portion 12 abuts against the sealant 4, as in the case of pulling out the air vent tube 6, as shown in FIG. 5. As described above, since the flange portion 12 is provided at the tip of the grout injection tube 8, the grout injection tube 8 does not fall out of the through hole 7 of the sealant 4 during the pulling out operation of the grout injection tube 8, and when the flange portion 12 abuts against the sealant 4, the grout injection tube 8 becomes unable to be pulled out, and the pulling out operation is completed. Note that when the flange portion 12 of the grout injection tube 8 is positioned so as to abut against the sealant 4 before the injection of the grout material 9, the pulling out operation of the grout injection tube 8 is not necessary.

[0042] The injection of the grout material 9 from the grout injection tube 8 is continued until the work of pulling out the air vent tube 6 and the grout injection tube 8 is completed.

[0043] Once the operation of pulling out the air vent tube 6 and the grout injection tube 8 has been completed and the injection of the grout material 9 from the grout injection tube 8 has been completed, the air vent tube 6 and the grout injection tube 8 are closed, as shown in Figure 5, so as to prevent the grout material 9 from leaking out of the air vent tube 6 and the grout injection tube 8. The air vent tube 6 and the grout injection tube 8 can be closed by tying the tube itself, tying the tube from the outside with a wire to block the flow path, plugging the tip of the tube, bending and fixing the tube, or closing a valve if one is provided along the way.

[0044] After the air vent tube 6 and the grout injection tube 8 have been closed, the grout material 9 is allowed to harden in this state.

[0045] After the grout material 9 has hardened, as shown in Figure 6, the sealing material 4 and reinforcing material 10 are removed, and the air vent tube 6 and grout injection tube 8 inserted into the through holes 5, 7 of the sealing material 4 are also removed. Here, the grout material 9 remaining inside the air vent tube 6 and grout injection tube 8 has hardened continuously with the grout material 9 inside the pilot hole 2, but because the inner diameters of the air vent tube 6 and grout injection tube 8 are sufficiently small compared to the diameter of the pilot hole 2, the parts protruding from the opening of the pilot hole 2 can be easily broken off and removed by applying a striking force with a hammer or by inserting a chisel and striking them.

[0046] In this way, after the grout material 9 hardens, the pilot hole 2 is filled with the grout material 9, and no air vent tube 6 or grout injection tube 8 remains, so the quality of the skeleton is excellent and deterioration of the skeleton does not progress early. In addition, there is no need to cut the air vent tube 6 or perform surface treatment work such as scraping or painting after cutting, reducing the workload.

[0047] [Other examples] As shown in Figure 7, it is preferable to provide a recess 15 on the inner surface side (the surface facing the pilot hole 2) of the sealing material 4 around the through hole 5 through which the air vent tube 6 passes, into which the flange portion 11 of the air vent tube 6 can fit, and to provide a recess 16 around the through hole 7 through which the grout injection tube 8 passes, into which the flange portion 12 of the grout injection tube 8 can fit. As a result, when the air vent tube 6 and the grout injection tube 8 are pulled out after the grout material 9 is injected, the flange portions 11 and 12 fit into the recesses 15 and 16, respectively, so that the inner surface of the sealing material 4 and the end faces of the air vent tube 6 and the grout injection tube 8 become approximately flat. Therefore, when the air vent tube 6 and the grout injection tube 8 are removed after the grout material 9 has hardened, the surface of the hardened grout material 9 is formed flat, which eliminates the need for surface finishing and further reduces the burden of the construction work. [Explanation of symbols]

[0048] 1...concrete body, 2...prepared hole, 3...anchor, 4...sealing material, 5...through hole, 6...air vent tube, 7...through hole, 8...grout injection tube, 9...grout material, 10...reinforcement material, 11 and 12...flange portion, 13..., 15 and 16...recess

Claims

1. A method for installing a post-installed anchor includes forming a pilot hole in the surface of an existing structure, inserting an anchor into the pilot hole, sealing the opening of the pilot hole with a sealant, and injecting grout into the pilot hole from a grout injection tube whose tip has been inserted into the pilot hole and penetrated through the sealant, while venting air from the pilot hole from an air vent tube whose tip has been inserted into the pilot hole and penetrated through the sealant, a flange portion having an enlarged outer diameter is provided at a tip end of the air vent tube on the side inserted into the pilot hole to prevent the tube from falling off the sealing material, a post-installed anchor installation method, characterized in that after confirming that the grout material has been discharged from the air vent tube and the pilot hole has been filled with the grout material, the air vent tube is pulled out until the flange portion abuts against the sealing material, and the grout material is hardened in this state.

2. A flange portion having an enlarged outer diameter is provided at the tip of the grout injection tube on the side inserted into the prepared hole to prevent it from falling off from the sealing material, 2. The method for installing a post-installed anchor according to claim 1, wherein after it is confirmed that the grout material has been discharged from the air vent tube and the pilot hole has been filled with the grout material, the grout injection tube is pulled out until the flange portion abuts against the sealing material, and the grout material is hardened in this state.

3. 2. The method for installing a post-installed anchor according to claim 1, wherein a soft, flexible hose is used as the air vent tube.

4. 2. The method for installing a post-installed anchor according to claim 1, wherein a transparent or semi-transparent hose is used as the air vent tube.

5. 2. The installation method for a post-installed anchor according to claim 1, wherein after completion of injection of the grout material from the grout injection tube, the air vent tube and the grout injection tube are closed so as to prevent the grout material from flowing out from the air vent tube and the grout injection tube, respectively.

6. 3. The method for installing a post-installed anchor according to claim 2, wherein a recess is provided on the inner surface of the sealing material around the penetration portion of the air vent tube, into which a flange portion of the air vent tube can fit, and a recess is provided around the penetration portion of the grout injection tube, into which a flange portion of the grout injection tube can fit.

Images