JP2006214097A - Grout injection plug and driving tool therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grout injection plug capable of securely sealing a drilled hole even when driving and using it in the oblique drilled hole and performing the work for breaking and removing a grout injection stem part smoothly. <P>SOLUTION: A pressure receiving collar 16 for receiving a tip of the driving tool fitted externally into the grout injection stem part 13 and a recessed groove 18 for mounting of a sealing member 17 positioned on a coming-off prevention insertion part 12 side for the pressure receiving collar 16 are provided at a position in a part where a non slip insertion part 12 and the grout injection stem part 13 are continuous on an outer peripheral face of a plug main body 11a incorporating a check valve 15 in an injection passage 14. A breakage possible part 19 of the grout injection stem part 13 is formed at a channel bottom position of the recessed groove 18 for mounting the sealing member, and length of a straight part 13a of the grout injection stem part 13 including thickness of the pressure receiving collar 16 is set to 4 to 50 mm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, a grout agent is injected into a gap such as a crack generated inside a concrete structure, and a grout agent injection plug for repairing a gap such as a crack and a plug for driving the plug into a perforation. It relates to a driving tool.

  Leaving voids such as cracks generated inside a concrete structure may cause water leakage, cracking of the concrete, peeling of tiles attached as exterior materials, etc., so it is necessary to fill the voids such as cracks by injecting a grout agent. is there.

  The conventional injection plugs 1 and 1a for injecting a grouting agent into a gap such as a crack as described above have a check valve in the injection passage of the grouting agent penetrating in the axial direction as shown in FIGS. The assembled plug body is formed by a retaining insertion portion 2 for inserting the concrete structure A into the perforation B and a grout agent injection shaft portion 3 connected to the rear end side, and the retaining insertion portion 2 and the grout agent injection shaft portion 3. The pressure receiving rod 4 that receives the tip of the driving tool C fitted on the grout injection shaft 3 and the seal member 5 that is located on the side of the retaining insertion portion 2 with respect to the pressure receiving rod 4 The structure is provided with a concave groove 6 for use.

  In order to inject a grouting agent into a gap such as a crack generated inside the concrete structure A using the injection plugs 1 and 1a as described above, a hole B reaching the crack from the outer surface to the concrete structure A is drilled. Drilled, the tip of the retaining insertion portion 2 faces the opening of the perforation B from the outer surface side of the concrete structure A, and the hammering tool C externally fitted to the grout injection shaft 3 is hit with a tool such as a hammer. Thus, the stopper insertion portion 2 is driven into the perforation B, and the injection plugs 1 and 1a are attached to the perforation B. In this state, the grout agent is formed on the nipple or the tapered surface 7 formed at the end of the grout agent injection shaft portion 3. When an injection pump is connected and the grouting agent is pushed out by this injection pump, the grouting agent flows into the crack through the perforation B, and when the grouting agent is injected into the crack, the injection is performed. It is sufficient to remove the pump, grout agent without leaking from the injection plug 1,1a by closing the check valve, the repair of cracks is completed by curing the grout agent filling the cracks.

  By the way, generally, when the position of the crack is close to the outer surface of the concrete structure A, the drilling hole B is cut using a drill having a diameter of 6 mm, and an injection plug adapted to the drilling B having a diameter of 6 mm is used.

  As shown in FIG. 7, the 6 mm injection plug 1 used for the 6 mm perforation B has an outer diameter that allows the stopper insertion portion 2 to the perforation B to be driven into the 6 mm perforation. The grouting agent injection shaft portion 3 is formed in a shaft shape having a slightly smaller diameter than the pressure receiving rod 4.

  When such an injection plug 1 is driven into the perforation B, the retaining insertion portion 2 is press-fitted into the perforation B, the sealing material 5 is compressed between the outer surface of the concrete structure A and the pressure receiving rod 4, and the opening end of the perforation B is compressed. Will be sealed.

  In addition, when the position of the crack is far from the outer surface of the concrete structure A, the drill with a diameter of 6 mm has a strong concern about the length, so the drill B is cut using a long drill with a diameter of 10 mm that is excellent in strength. An injection plug 1a adapted to a 10 mm perforation B is used.

  As shown in FIG. 8, the 10 mm injection plug 1a used for the 10 mm perforation B has an outer diameter that allows the stopper insertion portion 2 to be inserted into the perforation B to be driven into the 10 mm perforation B. The grout agent injection shaft portion 3 has a diameter slightly smaller than the pressure receiving rod 4.

  When such an injection plug 1a is driven into the perforation B, the retaining insertion portion 2 and the pressure receiving rod 4 are press-fitted into the perforation B, and the sealing material 5 is sealed at the inner position of the perforation B.

  The above-described perforations B are generally perforated horizontally, but depending on the positional relationship between the concrete structure A and the cracks, it may be necessary to perforate the perforations B obliquely. 1a must be driven diagonally.

  By the way, when the injection plugs 1 and 1a are driven into the oblique perforations B, as shown in FIG. 7, in the 6 mm injection plug 1, the upper part of the pressure receiving rod 4 comes into contact with the outer surface of the concrete structure A. There is a problem that it becomes impossible to drive, the lower part of the sealing material 5 is separated from the concrete structure A, the opening end of the perforation B cannot be sealed, and leakage of the grout agent occurs.

  Further, in the case of the injection plug 1a for 10 mm, as shown in FIG. 8, the conventional driving tool C used for driving has an outer diameter larger than that of the pressure receiving rod 4, so that the upper end of the driving tool C Can not be driven when it contacts the outer surface of the concrete structure A, the pressure receiving rod 4 and the lower part of the seal material 5 protrude from the concrete structure A, the opening end of the perforation B cannot be sealed, There is a problem that leakage of grouting agents occurs.

  Further, in any of the injection plugs 1 and 1a, when the repair of the crack is completed by the hardening of the grout agent filled with the crack, the grout agent injection shaft portion 3 protruding from the concrete structure A of the injection plug 1 and 1a to the outer surface. In the conventional 6 mm injection plug 1, the grout agent injection shaft portion 3 has the same length as the outer diameter, and the conventional 10 mm injection plug. In the injection plug 1a, the grout agent injection shaft portion 3 is set to a length that is about twice the outer diameter thereof. There is a problem that it is difficult to do.

  Accordingly, an object of the present invention is to inject a grout agent which can surely obtain a hermetic seal even when used for oblique perforation, and can smoothly remove the grout agent injection shaft part. It is to provide a plug and a driving tool for the plug.

  In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that the plug body is formed of a retaining insertion portion for piercing and a grout injection shaft that is connected to the rear end side. In a grout agent injection plug that incorporates a check valve in the grout agent injection path that penetrates the grout agent, the grout agent injection is located at the position where the stopper insertion portion and the grout agent injection shaft portion are connected on the outer peripheral surface of the plug body. A pressure receiving rod that receives the tip of a driving tool that is externally fitted to the shaft portion, and a groove for mounting the seal material that is positioned on the side of the retaining insertion portion with respect to the pressure receiving rod, and a groove bottom of the groove for mounting the seal material A foldable portion of the grout agent injection shaft portion is formed in the portion, and the straight portion of the grout agent injection shaft portion is set to a length of 4 mm to 50 mm including the thickness of the pressure receiving rod.

  According to a second aspect of the present invention, the plug body is formed of a retaining insertion portion for piercing the hole and a grout agent injection shaft portion connected to the rear end side, and the plug body is inserted into the grout agent injection path that penetrates the plug body in the axial direction. In a grout injection plug incorporating a check valve, the tip of a driving tool externally fitted to the grout injection shaft at the position where the retaining insert and the grout injection shaft are connected on the outer peripheral surface of the plug body. A pressure receiving rod receiving the pressure receiving rod, and a groove for attaching the sealing material located on the side of the retaining insertion portion with respect to the pressure receiving rod, and the grout agent injection shaft portion of the grout agent injection shaft portion at a position close to the pressure receiving rod of the grout agent injection shaft portion. A foldable portion is formed, the outer diameter of the pressure receiving rod is equal to or smaller than the maximum outer diameter of the retaining insertion portion, and the straight portion of the grout injection shaft includes the thickness of the pressure receiving rod. 4mm to 5mm It is obtained by adopting the configuration set to the length of mm.

  The invention of claim 3 is a driving tool for externally fitting to the grout agent injection shaft portion with respect to the grout agent injection plug according to claim 1 or 2 and driving the injection plug into the perforation through a pressure receiving rod. The portion that fits outside the grout injection shaft portion is a cylindrical portion, and the outer diameter of the cylindrical portion is equal to or smaller than the outer diameter of the pressure receiving rod.

  Here, the plug body is formed of a metal material, and the outer periphery of the retaining insertion portion is formed with a plurality of inclined surfaces having a small diameter on the front end side and a large diameter on the rear end side, so that the penetration into the perforation is smooth. The grouting agent injection shaft is a straight circular shaft, and its rear end is a nipple or conical surface for connecting the grouting agent injection pump. .

  According to the first aspect of the present invention, the pressure receiving rod that receives the tip of the driving tool and the groove for attaching the sealing material are provided on the outer peripheral surface of the plug main body, and the stopper is inserted at the groove bottom of the groove for mounting the sealing material. Since the corner is formed in the break-up part and the straight part of the grout agent injection shaft part is set to a length close to the outer diameter of this straight part, the grout agent injection shaft part becomes longer and the grout agent injection shaft part when driving By applying an external force in the bending direction, it becomes possible to bend the grouting agent injection shaft, thereby allowing the lower part of the sealing material to abut against the outer surface of the concrete structure, and the perforations provided in an inclined shape As a result, the plug can be used for the perforated holes.

  In addition, by making the grout agent injection shaft portion longer, a large external pressure can be applied to the foldable portion, and the grout agent injection shaft portion can be easily and reliably broken.

  According to the second aspect of the present invention, the outer peripheral surface of the plug body is provided with a pressure receiving rod for receiving the tip of the driving tool and a groove for attaching the seal material, and is folded at a position close to the pressure receiving rod of the grout agent injection shaft portion. The outer diameter of the pressure receiving rod is equal to or smaller than the maximum outer diameter of the retaining insertion portion, and the straight portion of the grout injection shaft is three times the outer diameter of the straight portion. Since the length of the plug body is set to a certain length, the entire length of the plug body can be inserted into the perforation, whereby the lower part of the sealing material can be positioned within the perforation, and the inside of the perforated hole can be sealed. Therefore, the plug can be used for the perforation provided in an inclined shape.

  In addition, by making the grout agent injection shaft portion longer, a large external pressure can be applied to the foldable portion, and the grout agent injection shaft portion can be easily and reliably broken.

  According to the third aspect of the present invention, the portion fitted on the grout injection shaft of the driving tool is a cylindrical portion, and the outer diameter of the cylindrical portion is equal to or smaller than the outer diameter of the pressure receiving rod in the plug. The tip of the driving tool does not come into contact with the concrete structure when the plug is driven, and the plug according to claim 1 can be reliably driven until the pressure receiving rod comes into contact with the concrete structure. The entire length of the plug can be driven into the perforation, and any plug can be used for perforation provided in an inclined manner.

  Hereinafter, embodiments of the present invention will be described based on illustrated examples.

  The first embodiment shown in FIGS. 1 to 3 is a grouting agent injection plug 11 that is used for punching 6 mm, and a metal plug main body 11a is provided with a retaining insertion portion 12 to the perforation B and thereafter. A check valve 15 is incorporated in a grout agent injection passage 14 that is formed by a grout agent injection shaft portion 13 that is connected to the end side, and that passes through the stopper insertion portion 12 and the grout agent injection shaft portion 13 in the axial direction. Yes.

  On the outer peripheral surface of the plug main body 11a, a pressure receiving rod 16 that receives the tip of a driving tool C fitted on the grout agent injection shaft portion 13 at a position where the retaining insertion portion 12 and the grout agent injection shaft portion 13 are connected. And a groove 18 for attaching the sealing material 17 located on the side of the retaining insertion portion 12 with respect to the pressure receiving rod 16, and a grout agent injection shaft portion at the groove bottom portion of the mounting groove 18 of the sealing material 17. Thirteen foldable portions 19 are formed.

  On the outer periphery of the retaining insertion portion 12, inclined surfaces 12a and straight portions 12b having a small diameter at the front end side and a large diameter toward the rear end side are formed in, for example, a three-stage arrangement alternately at intervals of 2.5 mm. The penetration into the perforations B is smooth, and a retaining effect is obtained.

  Each straight portion 12b of the retaining insertion portion 12 has an outer diameter of 6 mm for the straight portion at the tip, 6.25 mm for the middle straight portion, and 6.45 mm for the straight portion at the rear end, and the pressure receiving rod 16 is 8 mm. The pressure receiving rod 16 is driven into the 6 mm perforation B until the sealing material 17 comes into contact with the outer surface of the concrete structure A, so that it can be tightly fixed.

  The reverse support valve 15 is formed by urging the valve body 15 a that opens and closes the opening of the straight tube provided at the tip of the retaining insertion portion 12 by urging the elasticity in the valve closing direction by a spring 15 b. It is placed inside the tip side.

  The grouting agent injection shaft portion 13 is provided with a nipple or a conical surface 20 for connecting a grouting agent injection pump at the rear end of the straight portion 13a having an outer diameter of about 6 mm, and the length L of the straight portion 13a. Is set to a length of 4 mm to 50 mm including the thickness of the pressure receiving rod 16, for example, a length close to the outer diameter R of the straight portion 13a, and is longer than the straight portion of the grout agent injection shaft portion in the conventional plug. Yes.

  Here, if the thickness of the pressure receiving rod 16 is about 2 mm, and the length L of the straight portion 13a including the thickness of the pressure receiving rod 16 is 4 mm or less, it is too short to cause breakage and the like, and the length is 50 mm. Then, it becomes useless in material.

  Further, in the illustrated case, the foldable portion 19 of the grout agent injection shaft portion 13 is formed so that the groove bottom of the sealing material mounting groove 18 is inclined downward toward the retaining insertion portion 12 in the plug body 11a. The foldable portion 19 is formed within the groove width of the groove 18 for attaching the sealant, although the portion between the corner of the groove bottom and the inner injection passage 14 is made thin. It may be provided at any position.

  The driving tool C used for driving the injection plug 1 of the first embodiment into the perforation B has a circular shaft shape having a predetermined length, and a portion that fits outside the grout agent injection shaft portion 13 becomes a cylindrical portion C1, The driving tool C1 uses a hard metal material, and the cylindrical portion C1 has an inner diameter fitted to the grout injection shaft 13 and has an outer diameter equal to or smaller than the outer diameter of the pressure receiving rod 16.

  In addition, the distal end side of the cylindrical portion C1 is subjected to hardening treatment such as quenching to improve durability, and when deformation occurs at the distal end due to use of driving, so that it can be repeatedly removed and removed, The cylindrical part C1 is longer than the grout agent injection shaft part 13.

  The injection plug 11 of the first embodiment has the above-described configuration, and the drawing shows a use state for the perforation B in which the injection plug 11 is provided obliquely.

  In order to fill a gap such as a crack generated in the concrete structure A by injecting a grout agent, as shown in FIG. 3A, a perforation B reaching the crack from the outer surface is formed in the concrete structure A by an electric or hammer type. Drilling tool C, which is drilled diagonally with a drill, with the tip of the retaining insertion portion 12 of the injection plug 11 facing the opening of the perforation B from the outer surface side of the concrete structure A, and externally fitted to the grout injection shaft portion 13 By hitting with a tool such as a hammer, the retaining member 12 is driven into the perforation B by receiving a striking force with the pressure receiving rod 16, and the sealing material 17 is compressed between the upper portion of the pressure receiving rod 16 and the outer surface of the concrete structure A. To do.

  If the hammering tool C continues to be struck in this state, the injection plug 11 is bent due to the concentration of the force at the portion of the foldable portion 19 that is weak in strength, as shown in FIG. The entire periphery of the sealing material 17 comes into contact with the outer surface of the concrete structure A and seals the opening end of the perforation B.

  After that, when a grout agent injection pump is connected to the nipple or conical surface 20 of the grout agent injection shaft 13 from which the driving tool C has been removed, and the grout agent is pushed out by this injection pump, the check valve 15 opens. When the grouting agent flows into the crack from the injection path 14 through the perforation B, and the grouting agent is injected into the crack and the perforation B, the injection pump may be removed, and the grouting agent closes the check valve 15. If the grout agent filled with cracks and perforations B is cured without leaking from the injection plug 11 by the valve, the grout agent injection shaft portion 13 protruding from the outer surface of the concrete structure A can be struck from the radial direction and broken off. Breaking off from the portion 19 completes repair of the crack.

  Next, the second embodiment shown in FIGS. 4 to 6 is an injection plug 21 of a grout agent to be used for drilling 10 mm, and a metal plug body 21 a is inserted into the hole B to prevent it from coming off. 22 and a grout agent injection shaft portion 23 connected to the rear end side thereof, and a check valve 25 is provided in the grout agent injection passage 24 extending axially through the retaining insertion portion 22 and the grout agent injection shaft portion 23. It has been incorporated.

  A pressure receiving rod 26 that receives the tip of a driving tool C that is externally fitted to the grout agent injection shaft portion 23 at a position where the retaining insertion portion 22 and the grout agent injection shaft portion 23 are connected to each other on the outer peripheral surface of the plug body 21a. A groove 28 for attaching the sealing material 27 located on the side of the retaining insertion portion 22 with respect to the pressure receiving rod 26 is provided, and the position close to the pressure receiving rod 26 of the grout agent injection shaft portion 23 is a foldable portion 29. Is formed.

  On the outer periphery of the retaining insertion portion 22, inclined surfaces 22a and straight portions 22b having a small diameter on the front end side and a large diameter on the rear end side are formed in, for example, a four-stage arrangement alternately at intervals of 2 mm. As a result, entry into the vehicle is smooth and a retaining effect is obtained.

  Each straight portion 22b in the retaining insertion portion 22 has a first straight portion at the tip of 10 mm, a second straight portion at 10.1 mm, a third straight portion at 10.25 mm, and a fourth straight portion at 10.33 mm. The outer diameter of the pressure receiving rod 26 is set to an outer diameter of 10.4 mm which is substantially the same as that of the fourth straight portion, and sealing is performed by driving the pressure receiving rod 26 into the 10 mm bore B until the pressure receiving rod 26 enters the inside. It can be fixed to the state.

  The reverse support valve 25 is formed by urging the valve body 25a that opens and closes the opening of the straight tube provided at the tip of the retaining insertion portion 22 by urging the elasticity in the valve closing direction by a spring 25b. The arrangement is such that the entire length fits inside the tip side.

  The grout agent injection shaft portion 23 is provided with a nipple and a conical surface 30 for connecting a grout agent injection pump at the rear end of the straight portion 23a having an outer diameter of about 6.9 mm. The length L1 is set to a length of 4 mm to 50 mm including the thickness of the pressure receiving rod 26, for example, 2 mm, preferably about three times the diameter R1 of the straight portion 23a. It is longer than the straight part.

  Further, the foldable portion 29 of the grout agent injection shaft portion 23 is provided with an annular cutting groove 29a at a position close to the pressure receiving rod 26 of the grout agent injection shaft portion 23, and between the cutting groove 29a and the internal injection path 24. It is formed by making the part where the wall thickness is the thinnest.

  The driving tool C used for driving the injection plug 21 of the second embodiment into the perforation B has a circular shaft shape having a predetermined length, and a portion that fits outside the grout agent injection shaft portion 23 is a cylindrical portion C2. The driving tool C uses a hard metal material, and the cylindrical portion C2 has an inner diameter fitted to the grout agent injection shaft portion 23, and the outer diameter is equal to or smaller than the outer diameter of the pressure receiving rod 26.

  In addition, the distal end side of the cylindrical portion C2 is subjected to hardening treatment such as quenching to improve durability, and when deformation occurs in the distal end due to use of driving, so that it can be repeatedly used by cutting and removing it. The cylindrical part C <b> 2 is longer than the grout agent injection shaft part 23.

  The injection plug 21 of the second embodiment is configured as described above, and the drawing shows a use state for the perforation B in which the injection plug 21 is provided obliquely.

  In order to fill a gap such as a crack generated in the concrete structure A by injecting a grout agent, the perforation B reaching the crack from the outer surface of the concrete structure A is obliquely formed by an electric or hammer type drill as shown in FIG. The tip of the retaining insertion portion 22 of the injection plug 21 is made to face the opening portion of the perforation B from the outer surface side of the concrete structure A, and a driving tool C externally fitted to the grout agent injection shaft portion 23 is used as a hammer or the like. By hitting with the tool, the retaining insert 22 and the pressure receiving rod 26 subsequent thereto are driven into the perforation B by receiving a striking force with the pressure receiving rod 26, and the sealing material 27 of the mounting groove 28 is inserted into the perforation B. By positioning, the opening end side of the perforation B is sealed.

  When the injection plug 21 is driven, the driving tool C to be used has an outer diameter equal to or smaller than the outer diameter of the pressure receiving rod 26, so that the driving tool C is drilled as shown in FIG. B can be made to enter, and thereby, the retaining insertion portion 22 of the injection plug 21 can be driven deeper into the perforation B, and the sealing material 27 is positioned within the perforation B, so that A certain sealing state with respect to B can be obtained.

  After that, when a grout agent injection pump is connected to the nipple or conical surface 30 of the grout agent injection shaft portion 23 from which the driving tool C has been extracted, and the grout agent is pushed out by this injection pump, the check valve 25 opens. When the grouting agent flows into the crack from the injection path 24 through the perforation B, and the grouting agent is injected into the crack and the perforation B, the injection pump may be removed, and the grouting agent closes the check valve 25. If the grout agent filling the cracks and the perforations B is cured without leaking from the injection plug 21, if the grout agent injection shaft portion 23 protrudes from the outer surface of the concrete structure A, strike it from the radial direction. Folded from the breakable portion 29, and if the grout agent injection shaft 23 is within the perforation B, leave it as it is, and fill the opening of the perforation with a filler as shown in FIG. If the crack of the repair is completed.

The perspective view which shows the injection plug of the grout agent of 1st Embodiment Longitudinal front view showing the same injection plug (A) is a longitudinal front view showing a state in which the injection plug is driven into an oblique perforation, and (b) is a longitudinal front view showing a state in which the injected injection plug is bent. The perspective view which shows the injection plug of the grout agent of 2nd Embodiment Longitudinal front view showing the same injection plug (A) is a longitudinal sectional front view showing a state in which the injection plug is driven into an oblique perforation, and (b) shows a state when repair of a crack that has broken off the grout injection shaft portion of the injected injection plug is completed. Longitudinal front view Longitudinal front view showing a state in which a conventional 6 mm hole injection plug is driven into an oblique hole. A longitudinal front view showing a state in which a conventional injection plug for 10 mm holes is driven into an oblique perforation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Injection plug 11a Plug main body 12 Retaining prevention insertion part 13 Grout agent injection shaft part 14 Injection path 15 Check valve 16 Pressure receiving rod 17 Sealing material 18 Concave groove 19 Foldable part 20 Conical surface 21 Injection plug 21a Plug main body 22 Retaining prevention Insertion portion 23 Grout agent injection shaft portion 24 Injection passage 25 Check valve 26 Pressure receiving rod 27 Sealing material 28 Concave groove 29 Foldable portion 30 Conical surface

Claims (3)

  A grout with a plug body that is formed by a grout agent injection shaft that is connected to the rear end side of the plug body and a check valve is incorporated in the grout agent injection path that penetrates the plug body in the axial direction. In the agent injection plug, a pressure receiving rod that receives the tip of a driving tool externally fitted to the grout agent injection shaft portion at a position where the retaining insertion portion and the grout agent injection shaft portion are connected to each other on the outer peripheral surface of the plug body. A groove for mounting the sealing material positioned on the insertion side of the pressure receiving rod is provided, and a foldable portion of the grout injection shaft is formed on a groove bottom portion of the groove for mounting the sealing material. A grout agent injection plug, characterized in that the straight portion of the grout agent injection shaft portion is set to a length of 4 mm to 50 mm including the thickness of the pressure receiving rod.   A grout with a plug body that is formed by a grout agent injection shaft that is connected to the rear end side of the plug body and a check valve is incorporated in the grout agent injection path that penetrates the plug body in the axial direction. In the agent injection plug, a pressure receiving rod that receives the tip of a driving tool externally fitted to the grout agent injection shaft portion at a position where the retaining insertion portion and the grout agent injection shaft portion are connected to each other on the outer peripheral surface of the plug body. A groove for mounting the sealant located on the insertion side of the pressure receiving rod is provided, and a foldable portion of the grout agent injection shaft portion is formed at a position close to the pressure receiving rod of the grout agent injection shaft portion. The outer diameter of the pressure receiving rod is equal to or smaller than the maximum outer diameter of the retaining insertion portion, and the straight portion of the grout agent injection shaft portion has a length of 4 mm to 50 mm including the thickness of the pressure receiving rod. Set to Injection plug grout agent, characterized in that the. A driving tool for externally fitting the grout agent injection shaft portion to the grout agent injection shaft portion according to claim 1 or 2 and driving the injection plug into the perforation through a pressure receiving rod, and the grout agent injection shaft portion. A grout injection plug driving tool in which the outer fitting portion is a cylindrical portion, and the outer diameter of the cylindrical portion is equal to or smaller than the outer diameter of the pressure receiving rod.

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