JP2020056291A - Repair method and injection plug - Google Patents

Abstract

To provide a repair method capable of reducing an influence which water gives a resin and of repairing a gap even in the case that water exists in the gap.SOLUTION: A repair method for injecting a resin to a gap 103 caused by a crack 102 of a concrete structure 100 using an injection plug 1 comprises a step S10, a step S20 and a step S40. At the step S10 and the step S20 the injection plug 1 is inserted into the concrete structure 100. At the step S40 the resin is injected into the gap 103 via the injection plug 1. A discharge port diameter D1 of the injection plug 1 is equal to or greater than 1.0 mm and equal to or less than 3.5 mm and a discharge speed for discharging the resin at the step S40 is equal to or less than 4.0 m/sec.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a repair method for injecting a resin into a void portion caused by jointing or cracking of a concrete structure, and an injection plug for injecting the resin.

  Conventionally, repair has been performed by injecting a repair material (resin) into a void generated by splicing or cracking of a concrete structure (for example, see Patent Document 1).

In Patent Document 1, an injection plug is inserted into a concrete structure, and a high-viscosity (10,000 to 1,000,000 cps) repair material with high pressure (200 to 350 kg / cm ² ) and high viscosity (10,000 to 1,000,000 cps) is injected into the gap through the injection plug. I was

JP 2001-12084 A

  However, as in the conventional case, when the repair material is injected into the void portion at a high pressure, when the void portion is a wet surface, or when water is accumulated in the void portion, the injected repair agent mixes with the water and the curing failure occurs. May cause

  For this reason, operations such as drying the vicinity of the voids are required. However, these operations may cause an increase in cost and an extension of the construction period. Furthermore, on a rainy day, it was not possible to repair the air gap because it could not be dried.

  An object of the present invention is to provide a repair method and an injection plug that can reduce the influence of moisture on a resin and repair a void even when moisture is present in the void.

  In order to achieve the above object, a repair method according to a first aspect of the present invention is a repair method of injecting a resin into a void portion caused by splicing or cracking of a concrete structure using an injecting plug, comprising: And a step. The plugging process inserts an injection plug into the concrete structure. In the injection step, the resin is injected into the gap via the injection plug. The discharge port diameter of the injection plug was 1.0 mm or more and 3.5 mm or less, and the discharge flow rate at which the resin was discharged in the injection step was 4.0 m / sec or less.

  As described above, by injecting the resin at a slow discharge velocity of the resin of 4.0 m / sec or less, even if water is present in the gap, the resin is hardly mixed with the water. And the resin can be cured. In addition, from a viewpoint of construction time, the discharge flow rate is preferably equal to or greater than 0.05 m / sec, and more preferably equal to or greater than 0.1 m / sec.

  Therefore, even when moisture is present in the gap, the gap can be repaired without the need to dry the vicinity of the gap.

  The repair method according to the second invention is the repair method according to the first invention, wherein the injection pressure at the time of completion of the injection in the injection step is 4 MPa or less.

  As described above, by injecting the resin at a low injection pressure of 4 MPa or less, it is possible to make it difficult for the resin to mix with water.

  A repair method according to a third invention is the repair method according to the first or second invention, wherein the injection plug includes a main body, a connecting portion, and a check valve. The main body is provided at one end thereof with an inlet for injecting the resin into the concrete structure, and has a flow passage through which the resin flows. The connection part is arranged on the other end side of the main body part, has a flow passage through which the resin flows, and is connectable to a supply device to which the resin is supplied. The check valve is provided in the main body portion or the connection portion, and prevents the resin from flowing backward.

  By providing the check valve on the injection plug in this way, it is possible to prevent the resin injected into the gap from flowing back from the injection plug.

  The repair method according to a fourth invention is the repair method according to the third invention, wherein the check valve is opened at an injection pressure of 3.5 MPa or less.

  In this way, by setting the opening pressure of the check valve as low as 3.5 MPa or less, the resin can be injected into the gap with a low injection pressure, so that the resin is hardly mixed with the water in the gap, and It can be cured.

  The repair method according to a fifth invention is the repair method according to any one of the first to fourth inventions, wherein the resin has a viscosity of not less than 200 mPa · s and not more than 1500 mPa · s at 20 ° C.

  As described above, by using a resin having a low viscosity, the resin can be injected at a low pressure. That is, when a high-viscosity resin flows into a narrow crack, the pressure loss when the resin passes through the crack increases, and the injection pressure increases to overcome the pressure loss. For this reason, in order to inject at a pressure as low as possible, it is necessary to lower the viscosity of the resin.

  Further, since the viscosity is low, the fluidity inside the crack is good, and the resin penetrates deeply, so that the quality of repair is improved.

  An injection plug according to a sixth aspect of the present invention is an injection plug inserted into a concrete structure to inject a resin into a void portion caused by splicing or cracking of the concrete structure. A valve. The main body is provided at one end thereof with an inlet for injecting the resin into the concrete structure, and has a flow passage through which the resin flows. The connection part is arranged on the other end side of the main body part, has a flow passage through which the resin flows, and is connectable to a supply device to which the resin is supplied. The check valve is provided in the main body portion or the connection portion, and prevents the resin from flowing backward. The opening pressure of the check valve is 3.5 MPa or less.

  As described above, by setting the opening pressure of the check valve low to 3.5 MPa or less, the resin can be injected into the gap with a low injection pressure, so that the resin hardly mixes with the water in the gap, and the resin is removed. It can be cured.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a repair method and an injection plug that can reduce the influence of moisture on a resin and repair a void even when moisture exists in the void.

The figure which shows the arrangement | positioning state of the injection plug in embodiment concerning this invention, when repairing the clearance gap by the crack of a concrete structure. The side view of the injection plug of FIG. FIG. 3 is a partial cross-sectional view of the injection plug of FIG. 2. Sectional drawing of the connection part of FIG. The figure for demonstrating connection of the supply apparatus to the injection plug of FIG. FIG. 4 is a flowchart showing a repair method according to the embodiment of the present invention. FIG. 4 is a flowchart showing a test method of an example. (A), (b) The figure for demonstrating the test method of an Example and a comparative example. The figure for demonstrating the test method of an Example and a comparative example. The figure which shows the table of Examples 1-7 and Comparative Examples 1 and 2.

Hereinafter, an injection plug and a repair method according to an embodiment of the present invention will be described with reference to the drawings.
(Embodiment)
(1. Outline of injection plug)
First, a usage state of the injection plug 1 of the present embodiment will be described.

  The injection plug 1 is used by being inserted into a concrete structure in order to inject a resin into a gap caused by splicing or cracking of the concrete structure.

  FIG. 1 is a diagram showing an arrangement state of an injection plug in a case where a gap is repaired due to a crack in a concrete structure.

  In FIG. 1, a crack 102 is generated from a concrete wall surface 101 of a concrete structure 100, and a void 103 is formed by the crack 102. Although not shown, the concrete structure 100 may have embedded therein vertical and horizontal streaks. An injection hole 104 is formed obliquely from the concrete wall surface 101 toward the crack 102. The injection plug 1 is mounted in the injection hole 104. The resin is injected through the injection plug 1.

  As a resin injected into the crack, an epoxy resin having a viscosity of 200 mPa · s or more and 1500 mPa · s or less at 20 ° C. is used.

(2. Configuration of injection plug)
Next, the configuration of the injection plug 1 will be described.
FIG. 2 is a side view of the injection plug 1. The injection plug 1 includes a main body portion 10 and a connection portion 20. FIG. 3 is a view showing a cross section of the main body 10 of the injection plug 1. In FIG. 3, the direction of resin injection is indicated by an arrow A.

  As shown in FIG. 3, the main body 10 has a screw pipe 11, a nut 12, a rubber pipe 13, a washer 14, and a moving member 15.

  The screw pipe 11 has a screw shape on the surface and a space inside. Both ends of the screw pipe 11 are denoted by 11a and 11b.

  The nut 12 is located outside the screw pipe 11 and is fitted to an end 11 a of the screw pipe 11.

  The rubber tube 13 is arranged outside the screw pipe 11. The rubber tube 13 is disposed on the end 11 b side of the nut 12 and adjacent to the nut 12.

  The washer 14 is located outside the screw pipe 11. The washer 14 is disposed on the end 11 b side of the rubber tube 13 and adjacent to the rubber tube 13.

  The moving member 15 is cylindrical and has a screw shape formed on the inner peripheral surface. The moving member 15 is disposed adjacent to the washer 14. The moving member 15 is disposed so as to sandwich the rubber tube 13 and the washer 14. An end 15 a of the moving member 15 on the side of the washer 14 is fitted in a screw shape outside the end 11 b of the screw pipe 11. The outer surface portion 15c near the end 15b opposite to the end 15a of the moving member 15 is formed in a hexagonal shape.

  A flow path 16 through which the resin flows is formed by the inner space of the screw pipe 11 of the main body 10 and the inner space of the moving member 15. The opening at the end 11 a of the screw pipe 11 of the main body 10 serves as a resin discharge port 17, and the opening at the end 15 b of the moving member 15 serves as a resin inlet 18. The end 11a and the end 15b are both ends of the main body 10.

  Further, the diameter D1 of the discharge port 17 is shown, and the diameter D1 is set to be 1.0 mm or more and 3.5 mm or less.

  The connecting portion 20 is fixed by screwing to an inflow port 18 opening at the end 15 b of the main body 10. Various types of screws such as pipe screws, general screws, and fine screws can be used.

The connection part 20 is a grease nipple and is standardized in JIS B 1575.
FIG. 4 is a partial cross-sectional view of the connecting portion 20. In FIG. 4, half of the connecting portion 20 is shown as a cross section with respect to the center line O.

  The connection part 20 which is a grease nipple has a check valve 30. The check valve 30 includes a spring member 31 and a closing member 32, and the supply port 27 of the connecting portion 20 is closed when the closing member 32 contacts the contact portion 29. When the resin is supplied from the supply port 27 at a predetermined pressure or higher, the closing member 32 is pushed against the urging force of the spring member 31, separates from the contact portion 29, and the resin flows through the flow path 23 of the connection portion 20. Flows into. In this manner, the pressure at which the closing member 32 separates from the contact portion 29 (opening pressure of the check valve 30) is set to 3.5 MPa or less in the present embodiment. The opening pressure of the connection part 20 which is a grease nipple is 3.5 MPa or less because JIS specifies that injection is possible at 3.5 MPa or more.

(3. Repair method)
Next, a repair method according to the embodiment of the present invention will be described. FIG. 5 is a diagram illustrating a state in which the resin is being supplied. FIG. 6 is a flowchart illustrating a repair method according to the present embodiment.

  First, in step S10, as shown in FIG. 1, an injection hole 104 is formed obliquely from a concrete wall surface 101 toward a crack 102. Note that a sealing material 200 is disposed on the concrete wall surface 101 so as to cover the crack 102.

  Next, in step S20, the injection plug 1 is inserted into the injection hole 104 as shown in FIG. When the hexagonal outer surface portion 15c is turned with a spanner after insertion, the moving member 15 moves in the direction of arrow A with respect to the screw pipe 11. Since the position of the nut 12 with respect to the screw pipe 11 is fixed, the rubber tube 13 is compressed via the washer 14 as the moving member 15 moves in the direction of arrow A. As a result, the width of the rubber tube 13 widens, and the injection plug 1 comes into close contact with the injection hole 104.

  Next, in step S30, the tip of the injection gun 51 of the supply device 5 is connected to the connection portion 20 of the injection plug 1 as shown in FIG.

  Next, in step S40, a resin as a repair agent is injected. Here, the injection pump discharge flow rate is set so that the discharge flow rate of the resin from the injection plug 1 is 4.0 m / sec or less. The injection pressure at the time of completion of the injection is set to 4 MPa or less. The discharge flow rate is preferably 0.05 m / sec or more, and more preferably 0.1 m / sec or more, from the viewpoint of the construction time.

Next, in step S50, the resin is left to be cured.
Next, in step S60, the portion of the injection plug 1 protruding from the concrete wall surface 101 is beaten with a stone head hammer or the like, so that the injection plug 1 is broken inside the concrete structure 100, and a sealing material is applied to the broken portion. Then, the injection hole 104 is closed.

  By the above operation, the resin can be injected into the crack 102 generated in the concrete structure 100 to repair the crack 102.

(4. Example)
Hereinafter, the injection plug and the repair method of the present embodiment will be described using examples.

  FIG. 7 is a flowchart illustrating the test method of the present example. FIG. 8A, FIG. 8B, and FIG. 9 are diagrams for explaining the test method of the present example.

  First, in step S110, a pipe 201 shown in FIG. 8A is prepared. Then, as shown in FIG. 8B, the injection plug 1 is attached to one end 201a of the pipe 201, and the other end 201b is sealed with a resin putty P. The pipe 201 is an acrylic pipe having an inner diameter of 10.5 mm, and the total length L1 is 1000 mm. In addition, a hole 202 having a diameter of 5 mm serving as a resin discharge port and a water injection port is bored upward at a position 50 mm from the end 201b.

  Next, in step S120, the tap water is completely filled into the pipe 201 from the hole 202, as shown in FIG.

  Next, in step S130, a resin as a repair agent is injected into the pipe 201 from the high-pressure pump of the supply device 5 via the injection plug 1 as shown in FIG. Here, in Examples 1 to 7 and Comparative Examples 1 and 2, resin was injected by changing the discharge flow rate from the pump and the discharge port diameter D1 of the injection plug 1. Further, the discharge amount of the pump of the supply device 5 is measured, and the discharge flow rate is calculated from the discharge port diameter D1 of the injection plug 1.

  By injecting the resin in step S130, first, only water is extruded by the resin, and when a mixture of the resin and water is discharged from the hole 202, 100 mL is discarded in step S140.

  Next, in step S150, 50 mL of the resin R discharged from the hole 202 subsequent to step S140 is collected and used as a sample for evaluating the adhesive strength in Examples 1 to 7 and Comparative Examples 1 and 2.

  Next, in step S160, using the samples of Examples 1 to 7 and Comparative Examples 1 and 2, the adhesive strength is measured based on the adhesive strength test A method of JIS A 6024 5.13. The curing conditions were as follows: after the sample was prepared, the sample was half-immersed in water to a height of 90%, cured for 5 hours, then fully immersed, and cured for 7 days.

  FIG. 10 is a diagram showing a table of conditions and evaluation results in Examples 1 to 7 and Comparative Examples 1 and 2. In the following examples and comparative examples, the injection pressure of the resin is the opening pressure of the grease nipple of the injection plug. This is because, in the present embodiment and the comparative example, there is no load on the discharge side of the injection plug, and the resin is discharged into water substantially equal to the atmospheric pressure.

  In Example 1, the repair agent was discharged from the injection plug 1 having a discharge port diameter D1 of φ1.5 mm at an average discharge flow rate of 4.2 mL / sec using MP-1000 (manufactured by MASUDA) as a pump of the supply device 5. . The average discharge flow rate of 4.2 mL / sec was calculated from the average of three discharge flow rates (141 g / 30 sec, 128 g / 30 sec, 135 g / 30 sec).

  In this case, the discharge flow rate is 2.35 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above-mentioned curing condition, the bending adhesive strength was 2.6 MPa, which was good. In addition, the standard of the bending adhesive strength is defined as good when satisfying the standard equivalent to the bullying test of 2.7 N / mm2 of 5% forced water content, but is set to 2.4 MPa or more in consideration of the error.

  In Example 2, the repair agent was discharged from the injection plug 1 having the discharge port diameter D1 of φ3.0 mm at an average discharge flow rate of 4.2 mL / sec using MP-1000 (manufactured by MASUDA) as a pump of the supply device 5. . In this case, the discharge flow rate is 0.59 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above-mentioned curing conditions, the bending adhesive strength was 2.4 MPa, which was good.

  In Comparative Example 1, an average discharge flow rate of 8.8 mL / sec (average of three discharge flows (285 g / 30 sec, 286 g / 30 sec, 283 g / 30 sec)) using HD-2 (manufactured by WIWA) as a pump of the supply device 5. Then, the repair agent was discharged from an injection plug having a discharge port diameter D1 of φ1.5 mm. In this case, the discharge flow rate is 4.97 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above-mentioned curing conditions, the bending adhesive strength was 2.3 MPa, which was poor.

  In Comparative Example 2, an average discharge flow rate of 11.4 mL / sec (three discharge flow rates (392 g / 30 sec, 363 g / 30 sec, 353 g / sec) was obtained by using TEC-21 (manufactured by Tosada Corporation) as a pump of the supply device 5. At 30 seconds), the repair agent was discharged from an injection plug having a discharge port diameter D1 of φ1.5 mm. In this case, the discharge flow rate is 6.45 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above-mentioned curing conditions, the bending adhesive strength was 2.1 MPa, which was poor.

  In Example 3, the average discharge flow rate was 11.4 mL / sec (three discharge flow rates (392 g / 30 sec, 363 g / 30 sec, 353 g / At an average of 30 sec), the repair agent was discharged from an injection plug having a discharge port diameter D1 of 3.0 mm. In this case, the discharge flow rate is 1.61 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above curing conditions, the bending adhesive strength was 2.7 MPa, which was good.

  In Example 4, an average discharge flow rate of 4.0 mL / sec (3 discharge flow rates (132 g / 30 sec, 129 g / 30 sec, 126 g / 30 sec) was used using GC-12 (manufactured by Chiba Gikko Co., Ltd.) as a pump of the supply device 5. The repair agent was discharged from the injection plug 1 having a discharge port diameter D1 of φ1.5 mm. In this case, the discharge flow rate is 2.25 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above-mentioned curing condition, the bending adhesive strength was 2.6 MPa, which was good.

  In Example 5, the average discharge flow rate was 4.0 mL / sec (3 discharge flows (132 g / 30 sec, 129 g / 30 sec, 126 g / 30 sec) using GC-12 (manufactured by Chiba Gikko Co., Ltd.) as the pump of the supply device 5. The repair agent was discharged from the injection plug 1 having the discharge port diameter D1 of φ3.0 mm. In this case, the discharge flow rate is 0.56 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above-mentioned curing conditions, the bending adhesive strength was 3.1 MPa, which was good.

  In Example 6, the repair agent was discharged from the injection plug 1 having a discharge port diameter D1 of φ1.5 mm at an average discharge flow rate of 0.4 mL / sec using a hand pump (Chiyoda Corporation) as a pump of the supply device 5. In this case, the discharge flow rate is 0.23 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above curing conditions, the bending adhesive strength was 3.3 MPa, which was good.

  In Example 7, the repairing agent was discharged from the injection plug 1 having a discharge port diameter D1 of 3.0 mm at an average outflow rate of 0.4 mL / sec using a hand pump (Chiyoda Corporation) as a pump of the supply device 5. In this case, the discharge flow rate is 0.06 m / sec. As a result of evaluating the bending adhesive strength using the sample after the above curing conditions, the bending adhesive strength was 4.1 MPa, which was good.

(5. Features etc.)
(5-1)
The repair method according to the present embodiment is a repair method in which a resin is injected into the void portion 103 formed by the crack 102 of the concrete structure 100 by using the injection plug 1 as shown in FIG. Step S40 (an example of an injection step) and Step S40 (an example of an injection step). In steps S10 and S20 (an example of the insertion process), the injection plug 1 is inserted into the concrete structure 100. In step S40 (an example of an injection step), a resin is injected into the cavity 103 via the injection plug 1. The discharge port diameter D1 of the injection plug 1 was set to 1.0 mm or more and 3.5 mm or less, and the discharge flow rate for discharging the resin in step S40 (an example of the injection step) was set to 4.0 m / sec or less.

  As described above, by injecting the resin at a low resin discharge speed of 4.0 m / sec or less, even if water is present in the gap portion 103, the resin does not easily mix with the water. Can be reduced, and the resin can be cured.

Therefore, even when moisture is present in the gap, the gap can be repaired without the need to dry the vicinity of the gap 103.
In addition, from a viewpoint of construction time, the discharge flow rate is preferably equal to or greater than 0.05 m / sec, and more preferably equal to or greater than 0.1 m / sec.

(5-2)
In the repair method of the present embodiment, the injection pressure at the time of completion of the injection in Step S40 (an example of the injection process) is set to 4 MPa or less.

  As described above, by injecting the resin at a low injection pressure of 4 MPa or less, it is possible to make it difficult for the resin to mix with water.

(5-3)
In the repair method according to the present embodiment, the injection plug 1 includes the main body 10, the connection 20, and the check valve 30, as shown in FIG. The main body 10 has a discharge port 17 for injecting the resin into the concrete structure 100 at the end 11a (one example of one end), and a flow path 16 through which the resin flows is formed. The connecting portion 20 is disposed on the end 15b (an example of the other end) of the main body portion 10, has a flow passage 23 through which the resin flows, and is connectable to the supply device 5 to which the resin is supplied. The check valve 30 is provided in the connection part 20 and prevents the resin from flowing backward.

  By providing the check valve 30 in the injection plug 1 in this manner, it is possible to prevent the resin injected into the gap 103 from flowing back from the injection plug 1 before the resin hardens.

(5-4)
In the repair method of the present embodiment, the check valve 30 is opened when the injection pressure is equal to or less than 3.5 MPa.

  As described above, by setting the opening pressure of the check valve 30 to be as low as 3.5 MPa or less, the resin can be injected into the gap with a low injection pressure, so that the resin is hardly mixed with the water in the gap, and the resin is hardly mixed. Can be cured.

(5-5)
In the repair method of the present embodiment, the resin has a viscosity of not less than 200 mPa · s and not more than 1500 mPa · s at 20 ° C.

  As described above, by using a resin having a low viscosity, the resin can be injected at a low pressure. That is, when a high-viscosity resin flows into a narrow crack, the pressure loss when the resin passes through the crack increases, and the injection pressure increases to overcome the pressure loss. For this reason, in order to inject at a pressure as low as possible, it is necessary to lower the viscosity of the resin.

  Further, since the viscosity is low, the fluidity inside the crack is good, and the resin penetrates deeply, so that the quality of repair is improved.

(5-6)
The injection plug 1 according to the present embodiment is an injection plug 1 that is inserted into a concrete structure 100 to inject a resin into a void 103 formed by a crack 102 of the concrete structure 100, and includes a main body 10 and a connecting portion 20. And a check valve 30. The main body 10 has a discharge port 17 for injecting the resin into the concrete structure 100 at the end 11a (one example of one end), and a flow path 16 through which the resin flows is formed. The connecting portion 20 is disposed on the end 15b (an example of the other end) of the main body portion 10, has a flow passage 23 through which the resin flows, and is connectable to the supply device 5 to which the resin is supplied. The check valve 30 is provided in the connection part 20 and prevents the resin from flowing backward. The opening pressure of the check valve is 3.5 MPa or less.

  As described above, by setting the opening pressure of the check valve 30 to be as low as 3.5 MPa or less, the resin can be injected into the gap 103 with a low injection pressure, so that the resin is mixed with the moisture in the gap 103. It is difficult to cure the resin.

(6. Other embodiments)
As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention. Further, the embodiments described in this specification can be arbitrarily combined.

(A)
In the above-described embodiment, the repair of the crack of the concrete structure 100 has been described. However, the repair is not limited to the crack. For example, the repair of the void portion by splicing the concrete structure may be performed.

(B)
In the above embodiment, the check valve 30 is provided in the connection portion 20, but is not limited thereto, and may be provided in the main body 10, for example. In short, any configuration is possible as long as it can prevent backflow after the resin is injected.

(C)
In the above-described embodiment, the check valve 30 is provided on the injection plug 1, but the check valve 30 may not be provided, and the supply port 27 of the injection plug 1 may be opened by an operator by clogging a member or the like. May be closed.

(D)
In the above embodiment, the main body 10 and the connecting part 20 of the injection plug 1 are separate and separable, but may be integrated.

  INDUSTRIAL APPLICABILITY The repair method and the injection plug of the present invention have an effect of reducing the effect of water on a resin and repairing a void portion, and are useful for repairing a concrete structure and the like.

1: Injection plug 5: Supply device 10: Main body 11: Screw pipe 11a, 11b: End 12: Nut 13: Rubber tube 14: Washer 15: Moving member 15a, 15b: End 15c: Outer surface portion 16: Flow path 17: Discharge port 18: Inflow port 20: Connection part 23: Flow path 27: Supply port 29: Contact part 30: Check valve 31: Spring member 32: Closure member 51: Injection gun 100: Concrete structure 101: Concrete wall surface 102 : Crack 103: void 104: injection hole 200: sealing material 201 a, 201 b: end 202: hole

Claims (6)

A repair method for injecting a resin using an injection plug into a void portion caused by jointing or cracking of a concrete structure,
Inserting the injection plug into the concrete structure;
An injection step of injecting the resin into the gap portion via the injection plug,
A repair method, wherein a discharge port diameter of the injection plug is 1.0 mm or more and 3.5 mm or less, and a discharge flow rate at which the resin is discharged in the injection step is 4.0 m / sec or less.   The repair method according to claim 1, wherein an injection pressure at the time of completion of the injection in the injection step is 4 MPa or less. The injection plug,
An inlet for injecting the resin into the concrete structure is provided at one end side, and a main body formed with a flow path through which the resin flows,
A connection portion arranged on the other end side of the main body portion, and a flow path through which the resin flows is formed, and a connection portion connectable to a supply device to which the resin is supplied,
The repair method according to claim 1, further comprising: a check valve provided in the main body portion or the connection portion to prevent the resin from flowing backward.   The repair method according to claim 3, wherein the check valve is opened when an injection pressure is 3.5 MPa or less.   The repair method according to any one of claims 1 to 4, wherein the resin has a viscosity of not less than 200 mPa · s and not more than 1500 mPa · s at 20 ° C. An injection plug inserted into the concrete structure for injecting resin into a void portion caused by jointing or cracking of the concrete structure,
An inlet for injecting the resin into the concrete structure is provided at one end side, and a main body formed with a flow path through which the resin flows,
A connection portion arranged on the other end side of the main body portion, and a flow path through which the resin flows is formed, and a connection portion connectable to a supply device to which the resin is supplied,
A check valve provided in the main body portion or the connection portion to prevent backflow of the resin,
The opening pressure of the check valve is 3.5 MPa or less;
Injection plug.

Images