Injection nozzle

Abstract

To provide an injection nozzle that can be attached to a conventionally used injector, that can smoothly suck a filler into the injector even when a highly viscous filler is used, and that can easily inject the filler into the sleeve of a reinforcing bar joint. [Solution] The injection nozzle 1 is attached to the tip of an injector equipped with a cylindrical filler storage section that stores the filler to be injected into the sleeve of a mortar-filled joint, and a piston-shaped shaft for sucking the filler into the filler storage section and injecting the sucked-in filler. It comprises a cylindrical injector connection section that connects to the filler storage section of the injector, a nozzle body 2, an injection port 4 provided at the tip of the nozzle body 2 and through which the filler is discharged when the shaft is pressed, and an additional suction hole 5 provided in the nozzle body 2 separately from the injection port 4 and opened when the filler is sucked in, for sucking in the filler.

Description

[Technical Field]

[0001] The present invention relates to an injection nozzle attached to the tip of an injector for filling a filling material such as grout or mortar (hereinafter referred to as "grout") into the sleeve of a mortar-filled joint. [Background technology]

[0002] Mortar-filled joints have traditionally been used as rebar joints. Mortar-filled joints do not directly join rebars together, but instead join the rebars by inserting them into a rebar joint sleeve from both ends and injecting a filler such as grout into the sleeve.

[0003] Patent Documents 1 to 3, for example, are inventions relating to grout injectors that inject filler into the sleeve of a reinforcing bar joint.

[0004] The invention described in Patent Document 1 was made by the present applicant, and discloses a filler injection pipe for a reinforcing bar joint sleeve, which comprises a pipe-shaped long nozzle, a long sheath tube that can slide freely along the peripheral wall of the long nozzle, and one end of the long nozzle formed as an injection port and the other end formed as a cylindrical gripping portion, and in which a check valve is provided on one end of the long sheath tube.

[0005] The invention described in Patent Document 2 is a grout injector used to inject grout into a sleeve provided with a grout injection port and to bond the reinforcing bar inserted into the sleeve to the sleeve. The grout injector disclosed has: a nozzle that is inserted into the injection port and injects the grout into the sleeve; a container that is attached to the base end of the nozzle and has an opening on one end for filling the grout, and that contains the grout; and a squeezer that closes the opening of the container in an openable and closable manner and squeezes the container up to send the grout into the sleeve from the nozzle.

[0006] The invention described in Patent Document 3 discloses a grout injection device for reinforcing bar joints that injects grout into an injection hole of a joint into which the end of a threaded reinforcing bar is screwed, and that includes an injection nozzle whose tip is inserted into the injection hole, a pressure pump that pumps the grout, and a hose that connects the base end of the injection nozzle to the pressure pump, as well as a holder that holds the injection nozzle, which is detachably attached to the joint and keeps the tip of the injection nozzle inserted into the injection hole. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-048645 [Patent Document 2] Japanese Patent Application Publication No. 2017-014707 [Patent Document 3] Japanese Patent Application Publication No. 11-081678 Summary of the Invention [Problem to be solved by the invention]

[0008] The invention described in Patent Document 1 is designed to prevent filler that remains in the injection nozzle after injection from the filler injection pipe into a reinforcing bar joint sleeve from leaking out of the pipe.The tip of the injection nozzle, which has a sharp shape when not in use, can be stored inside the sheath tube of the filler injection pipe, but no consideration is given to suctioning the filler.

[0009] In the invention described in Patent Document 2, the container that stores the grout and the opening of the container can be freely opened and closed, and the nozzle and container can be detached from each other, but it is difficult to put grout through the opening of the container. Also, the container is squeezed with a squeezing tool to send the grout from the nozzle into the sleeve, but squeezing the container is difficult in the case of highly viscous grout.

[0010] The invention described in Patent Document 3 is designed to handle grout injection work in narrow spaces where rebar is crowded together, but it is not intended to be attached to a conventional injector and does not have the function of sucking in filler material.

[0011] When injecting grout into a rebar joint sleeve, for example, the strength increases by decreasing the water-cement ratio, but the viscosity increases and it becomes difficult to handle. Conventionally, when filling the injector, the injector shaft is pulled up to suck the filler through the inlet, but high viscosity makes it difficult to suck the filler.

[0012] Furthermore, when multiple mortar-filled joints, such as two-tiered reinforcing bars, are arranged in parallel, the spacing between the joints is narrow, making it difficult to fill the sleeves of joints located at the back with grout using conventional injection nozzles.In addition, there may be obstacles near the reinforcing bar joints, making it difficult to fill with grout.

[0013] The present invention aims to solve the problems described above, and provides an injection nozzle that can be attached to previously used injectors, and can smoothly suck filler into the injector even when injecting highly viscous filler or when there are multiple reinforcing bar joints or obstacles, making it easy to inject into the sleeve of a mortar-filled joint. [Means for solving the problem]

[0014] The injection nozzle of the present invention is an injection nozzle that is attached to the tip of an injector that has a cylindrical filler storage section that stores filler to be injected into the sleeve of a mortar-filled joint, and a piston-shaped shaft for sucking the filler into the filler storage section and injecting the sucked-in filler, and is characterized by comprising: a cylindrical injector connection section that is connected to the filler storage section of the injector; a nozzle body; an injection port that is provided at the tip of the nozzle body and through which the filler is discharged when the shaft is pressed; and an additional suction hole that is provided in the nozzle body separately from the injection port and is opened when the filler is sucked in, for sucking in the filler.

[0015] In the injection nozzle of the present invention, the nozzle body is provided with an inlet opening / closing lid that covers the upper surface of the nozzle body and is rotatable around the axis of the nozzle, and the inlet opening / closing lid is provided with an inlet matching hole, so that the inlet hole of the nozzle body is opened by aligning its position with the inlet matching hole, and the inlet hole is closed by positioning the inlet hole and the inlet matching hole in different positions.

[0016] In the injection nozzle of the present invention, a tapered nozzle inner body is provided along the inner surface of the nozzle main body, and a check valve for the suction hole is provided in which part of the side of the nozzle inner body is separated by an approximately circular notch larger than the suction hole, and a raised suction hole inner cover is formed in the center of the check valve for the suction hole, and by positioning the suction hole of the nozzle main body and the suction hole inner cover at different positions, the suction hole inner cover and the suction hole check valve are pushed, creating a gap in the notch of the suction hole check valve, thereby opening the suction hole, and the suction hole can be closed by aligning the positions of the suction hole of the nozzle main body and the suction hole inner cover.

[0017] In the injection nozzle of the present invention, the suction hole can be closed by attaching a suction hole cover with a check valve to the suction hole, and the suction hole cover with a check valve can be composed of a tube that follows the inner surface of the suction hole, a rim that is provided vertically from the side of the tube at the upper part of the tube and has a larger diameter than the suction hole, a perforated bottom that is provided in a rim-like shape at the lower part of the tube, and a check valve that is attached to a part of the perforated bottom and is sized to block the hole in the perforated bottom.

[0018] In addition, in the injection nozzle of the present invention, the suction hole is provided in parallel to the injection port, and the suction hole can be closed by attaching the suction hole cover with the check valve to the suction hole.

[0019] In addition, in the injection nozzle of the present invention, the nozzle body has a wide, flat shape, the suction holes are arranged in parallel on the left and right sides of the injection inlet, and the suction hole can be closed by attaching a suction hole cover with a check valve to the suction hole, and the suction hole cover with a check valve is characterized in that it is composed of a tube that follows the inner surface of the suction hole, a rim that is arranged vertically from the side of the tube at the top of the tube, a perforated bottom that is arranged in a rim-like manner at the bottom of the tube, and a check valve that is attached to a part of the perforated bottom and is sized to cover the hole in the perforated bottom. [Effects of the Invention]

[0020] The injection nozzle of the present invention can smoothly suck the filler into the injector not only through the injection port but also through the additional suction hole, even when a highly viscous filler is used as the filler to be injected into the mortar-filled joint, making it easy to inject the filler into the sleeve of the reinforcing bar joint.In addition, it can be attached to a conventional injector.

[0021] Furthermore, in the injection nozzle of the present invention, if the nozzle body is made wide and flat, it can easily enter the gaps between the reinforcing bar joints arranged in parallel in multiple layers, and the filler can be injected into the sleeve of the reinforcing bar joint of multiple layers. The filler can also be injected even if there is an obstacle near the reinforcing bar joint. [Brief explanation of the drawings]

[0022] [Figure 1] 1A and 1B show a first embodiment of the injection nozzle of the present invention, in which (a) is a front view and (b) is a longitudinal sectional view. [Figure 2] FIG. 1 is an assembly diagram showing the injection of Example 1. [Figure 3] FIG. 1 is an assembly diagram showing Example 1 during inhalation. [Figure 4] 1 shows a second embodiment of the injection nozzle of the present invention, where (a) is a front view and (b) is a longitudinal sectional view. [Figure 5] FIG. 10 is an assembly diagram showing the injection of Example 2. [Figure 6] FIG. 10 is an assembly diagram showing Example 2 during inhalation. [Figure 7] FIG. 10 is an explanatory view showing a nozzle inner surface provided inside Example 2. [Figure 8] 1 shows a third embodiment of the injection nozzle of the present invention, where (a) is a front view and (b) is a longitudinal sectional view. [Figure 9] FIG. 10 is an assembly diagram showing the injection of Example 3. [Figure 10] FIG. 10 is an assembly diagram showing Example 3 during inhalation. [Figure 11] FIG. 10 is a perspective view showing a check valve-equipped suction hole cover in the third and fourth embodiments. [Figure 12] 10A and 10B show a fourth embodiment of the injection nozzle of the present invention, in which (a) is a perspective view and (b) is a longitudinal sectional view. [Figure 13] FIG. 10 is an assembly diagram showing the injection process of Example 4. [Figure 14] FIG. 10 is an assembly diagram showing Example 4 during inhalation. [Figure 15] FIG. 1 is a schematic diagram showing an embodiment of an injector equipped with an injection nozzle according to Example 1 of the present invention. [Figure 16] 10A and 10B show a fifth embodiment of the injection nozzle of the present invention, in which FIG. 10A is a perspective view and FIG. 10B is a longitudinal sectional view. [Figure 17]17 shows an example in which the tip of the injection port and a suction port cover with a check valve are attached to the embodiment of FIG. 16, where (a) is a perspective view and (b) is a vertical cross-sectional view. [Figure 18] FIG. 10 is an assembly diagram showing Example 5 during inhalation. [Figure 19] FIG. 10 is a schematic diagram showing one embodiment of an injector equipped with an injection nozzle according to Example 5 of the present invention, with the shaft extended. [Figure 20] In the embodiment of FIG. 19, the shaft is slightly depressed. [Figure 21] In the embodiment of FIG. 20, the shaft is further pushed. [Figure 22] FIG. 5 is a schematic diagram showing an example in which an injector equipped with an injection nozzle according to Example 5 of the present invention is used in a reinforcing bar joint for double-stage reinforcement. [Figure 23] FIG. 23 is a side view of the embodiment of FIG. 22. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0024] The injection nozzle 1 of the present invention is attached to the tip of an injector used when injecting filler into the sleeve of a mortar-filled joint. The injector 21 preferably includes a cylindrical filler storage section 22 for storing the filler, and a piston-shaped shaft 23 for sucking the filler into the filler storage section 22 and injecting the sucked filler.

[0025] Fig. 1 shows a first embodiment of the injection nozzle 1 of the present invention, where (a) is a front view and (b) is a longitudinal sectional view. Fig. 2 is an assembly diagram showing the configuration when injecting a filler in the first embodiment, and Fig. 3 is an assembly diagram showing the configuration when sucking the filler.

[0026] Injection nozzle 1 of Example 1 has a tapered nozzle body 2 with a thin, cylindrical injection section 3 at the tip, and filler is injected through injection port 4. The cross section of the tip of injection section 3 of injection port 4 is beveled to make it easier to insert into the hole in the sleeve of the rebar joint. A suction hole 5 is provided on the side of nozzle body 2 to suck in the filler.

[0027] A tapered suction hole opening / closing lid 6 is provided to cover the top surface of the nozzle body 2, and a suction matching hole 7 is provided on the side of the suction hole opening / closing lid 6. The suction hole opening / closing lid 6 can be rotated in the axial direction on the nozzle body 2 around the injection part 3.

[0028] When injecting filler from the injection port 4 of the injection nozzle 1, the suction hole opening / closing lid 6 is rotated in the axial direction of the nozzle to shift the positions of the suction hole 5 provided in the nozzle body 2 and the suction matching hole 7 provided in the suction hole opening / closing lid 6, as shown in Figure 2, so that the suction hole 5 is closed when used.

[0029] Furthermore, when the filler is to be sucked through the suction hole 5 of the injection nozzle 1, the suction hole opening / closing cover 6 is rotated in the axial direction of the nozzle to align the suction hole 5 provided in the nozzle body 2 with the suction matching hole 7 provided in the suction hole opening / closing cover 6, as shown in Figure 3, so that the suction hole 5 is in an open state.

[0030] Furthermore, a cylindrical syringe connector 16 for connecting to and attaching to a syringe is provided at the bottom of injection nozzle body 2. Syringe connector 16 may be provided with a connection notch 17 to make it easier to insert into the syringe.

[0031] Figure 4 shows a second embodiment of the injection nozzle 1 of the present invention, where (a) is a front view and (b) is a longitudinal cross-sectional view, Figure 5 is an assembly diagram when injecting the filler in the second embodiment, Figure 6 is an assembly diagram when sucking the filler, and Figure 7 is an explanatory diagram showing the nozzle inner surface 8 provided inside the nozzle main body 2.

[0032] Injection nozzle 1 of Example 2 has a tapered nozzle body 2 with a thin, cylindrical injection section 3 at the tip, allowing filler to be injected through injection port 4. The cross section of the tip of injection section 3 is beveled to make it easier to inject the filler into the sleeve of the rebar joint through injection port 4. A suction hole 5 is provided on the side of nozzle body 2 to suck in the filler.

[0033] A tapered nozzle inner body 8 is provided inside the nozzle body 2, following the inner surface of the nozzle body 2, and the nozzle body 2 can rotate in the axial direction on the upper surface of the nozzle inner body 8. The nozzle inner body 8 shown in Figure 7 has a notch larger than the diameter of the suction hole 5, forming a substantially circular suction hole check valve 9 which is the free end to which part of the nozzle inner body 8 is attached. A tapered suction hole inner cover 10 is formed in the center of the suction hole check valve 9, protruding outward from the nozzle inner body 8.

[0034] When injecting filler from the injection port 4 of the injection nozzle 1, as shown in Figure 5, the suction hole inner cover 10 provided on the nozzle inner surface 8 is fitted into the suction hole 5 provided in the nozzle main body 2, and the nozzle is used with the suction hole 5 closed.

[0035] When the filler material is sucked into the injection nozzle 1, the positions of the suction hole 5 provided in the nozzle body 2 and the suction hole inner cover 10 provided in the nozzle inner body 8 are shifted, so that the suction hole inner cover 10 is pressed by the inner surface of the nozzle body, and the notch provided on the outer periphery of the suction hole check valve 9 opens to form an opening. This opening keeps the suction hole 5 open, allowing the filler material to be sucked in when the syringe shaft is pulled.

[0036] Figure 8 shows a third embodiment of the injection nozzle 1 of the present invention, where (a) is a front view and (b) is a longitudinal sectional view. Figure 9 is an assembly diagram of the third embodiment when injecting a filler material, and Figure 10 is an assembly diagram of the third embodiment when sucking the filler material.

[0037] Injection nozzle 1 of Example 3 has a thin, cylindrical injection section 3 at the tip of tapered nozzle body 2, and filler can be injected through injection port 4. The cross section of the tip of injection section 3 is beveled to make it easier to inject into the sleeve of the rebar joint from injection port 4. A suction hole 5 is provided on the side of nozzle body 2 to suck in the filler.

[0038] A removable suction hole cover 11 with a check valve can be attached to the suction hole 5. Figure 11 shows perspective views of the suction hole cover 11 with a check valve in Example 3, with (a) and (c) being views seen from above and (b) being a view seen from below.

[0039] The check valve-equipped suction hole cover 11 is hat-shaped so that it can fit over the suction hole 5, and is provided with a tube 12 that fits along the inner surface of the suction hole 5. The upper part of the tube 12 has a rim 13 that is larger than the diameter of the suction hole 5 and extends perpendicularly from the tube 12, so that the check valve-equipped suction hole cover 11 stays in place when fitted over the suction hole 5. The lower part of the tube 12 has a rim-shaped perforated bottom 14 with a hole in the center, and is provided with a check valve 15 that is large enough to close the hole in the perforated bottom 14 and is attached to part of the perforated bottom 14.

[0040] When injecting a filler material using the injection nozzle 1 of Example 3, as shown in Figure 9, the suction hole 5 is closed by attaching the suction hole cover 11 with a check valve to the suction hole 5. When injecting a filler material, it is advisable to remove the suction hole cover 11 with a check valve and leave the suction hole 5 open as shown in Figure 10.

[0041] Figure 12 shows Example 4 of the injection nozzle 1 of the present invention, (a) is a perspective view, (b) is a longitudinal sectional view. Figure 13 is an assembly diagram of Example 4 when injecting a filler material, and Figure 14 is an assembly diagram of Example 4 when sucking the filler material.

[0042] Injection nozzle 1 of Example 4 has a tapered nozzle body 2 with a thin, cylindrical injection part 3 at the tip, and filler can be injected from injection port 4. The cross section of the tip of injection part 3 is beveled to make it easier to inject filler from injection port 4 into the sleeve of the rebar joint.

[0043] In Example 4, an inlet hole 5 is provided next to the injection section 3. The inlet hole 5 can be fitted with the check valve-equipped inlet cover 11 shown in Example 3 and FIG. 11. When injecting filler using the injection nozzle 1 of Example 4, the check valve-equipped inlet cover 11 is attached to the inlet hole 5 to close it, as shown in FIG. 13. When injecting filler, the check valve-equipped inlet cover 11 can be removed to leave the inlet hole 5 open, as shown in FIG. 14.

[0044] 15 is a schematic diagram of Example 1 of the injection nozzle 1 of the present invention attached to an injector 21. The injector 21 has a cylindrical filler storage section 22 that stores the filler, and a piston-shaped shaft 23 for drawing the filler into the filler storage section 22 and injecting the drawn-in filler. Next, an example of the procedure for using the injection nozzle 1 will be described.

[0045] (1) The syringe connector 16 of the injection nozzle 1 is connected to the end of the filler storage section 22 of the syringe 21 and attached. (2) Rotate the suction hole opening / closing cover 6 in the axial direction of the nozzle body 2 to align the suction hole 5 with the suction matching hole 7, thereby opening the suction hole 5.

[0046] (3) The injection nozzle 1 is inserted into a container such as a kneading can containing the kneaded filler, and the shaft 23 is pulled to suck in the filler and store it in the filler storage section 22. (4) The suction hole opening / closing cover 6 is rotated in the axial direction of the nozzle body 2 to shift the positions of the suction hole 5 and the suction matching hole 7, thereby closing the suction hole 5.

[0047] (5) Insert the injection port 4 of the injection nozzle 1 into the sleeve injection port 27 provided in the sleeve 26 of the rebar joint 24, and push the shaft 23 of the injector 21 to inject the filler into the sleeve. Inject the filler until it overflows from the sleeve discharge port 28.

[0048] FIG. 15 shows an embodiment in which the injection nozzle 1 of Example 1 is attached to an injector 21, but the injection nozzles 1 of Examples 2 to 4 can also be attached to injectors 21 and used in the same way.

[0049] 16 shows Example 5 of the injection nozzle 1 of the present invention, where (a) is a perspective view and (b) is a longitudinal cross-sectional view. The injection nozzle 1 of Example 5 is mainly used when there are reinforcing bar joints 24 with multiple layers of reinforcement or when there are obstacles nearby, which are difficult to inject with conventional injection nozzles 1.

[0050] The injection nozzle 1 of Example 5 is provided with a nozzle body 2 that has a wide, flat shape extending from the top of a cylindrical injector connection portion 16 toward the tip. At the tip of the nozzle body 2, there is a cylindrical injection portion 3 with an injection port 4. Suction holes 5 are provided in parallel on the left and right sides of the injection portion 3.

[0051] In the injection nozzle 1 of Example 5, the outer periphery of the injection part 3 is threaded, so that injection inlet tip 4a with different lengths and shapes, for example, can be freely selected and attached. The shape in Figure 16 shows the state in which the injection inlet 4 and suction hole 5 are open, and shows the configuration of Example 5 when the filler is being sucked in.

[0052] Figure 17 shows an example in which an injection port tip 4a and a check valve-equipped suction hole cover 11 are attached to the embodiment of Figure 16, (a) being a perspective view and (b) being a longitudinal cross-sectional view. In the embodiment of Figure 16, an injection port tip 4a with an oblique tip is attached to the injection part 3.

[0053] In addition, the suction holes 5 provided on the left and right sides of the injection part 3 are closed by attaching the suction hole covers 11 with check valves as shown in Fig. 11. The shape in Fig. 17 shows the state in which the suction holes 5 are closed, and shows the state when the filler material of Example 5 is injected.

[0054] Figure 18 is an assembly diagram showing Example 5 during suction. As also shown in Figure 16, injection nozzle 1 of Example 5 is characterized by a flat shape that widens toward the tip of nozzle body 2. Suction holes 5 are provided in parallel on the left and right sides of injection section 3, and it is preferable that injection hole 4 and suction hole 5 are open when the filler material is suctioned into injector 21. Furthermore, when injecting the filler material, injection port tip 4a is attached to injection hole 4, and suction hole cover 11 with a check valve is attached to suction hole 5 to close suction hole 5 (see Figure 17).

[0055] 19 is a schematic diagram showing one embodiment of an injector 21 equipped with an injection nozzle 1 according to Example 5 of the present invention. The injector 21 is equipped with a cylindrical filler storage section 22 that stores the filler, and a piston-shaped shaft 23 for drawing the filler into the filler storage section 22 and injecting the drawn-in filler. The injector connection section 16 of the injection nozzle 1 is attached to the filler storage section 22 equipped with the shaft 23.

[0056] Injection port tip 4a is attached to injection part 3, and suction port cover 11 with a check valve is attached to suction port 5. Figure 19 shows the state in which shaft 23 is extended, and shows the state in which, for example, filler material is sucked into filler material storage part 22 of injector 21 and then injection begins.

[0057] Figure 20 shows the state when the shaft 23 of the injector 21 in the embodiment of Figure 19 is slightly pressed, for example, when a filler is being injected. When the shaft 23 is pressed, the filler in the filler-containing portion 22 comes out from the tip of the injection port 4a.

[0058] Figure 21 shows a state in which shaft 23 has been further pushed from the embodiment in Figure 20. Shaft 23 is pushed all the way in, and the filler in filler storage section 22 is used up until no more filler comes out from injection port tip 4a. To continue inhaling filler, injection port tip 4a is removed from injection section 3, and check valve-equipped suction port cover 11 is removed from suction port 5, leaving injection port 4 and suction port 5 open.

[0059] Fig. 22 is a schematic diagram showing the state in which an injector 21 equipped with the injection nozzle 1 of Example 5 is being used to inject into a reinforcing bar joint 24 of two-stage reinforcement. Fig. 23 is a side view of the embodiment of Fig. 22.

[0060] In the case of two-tiered reinforcement where the rebar joints 24 are arranged in two tiers, the conventional injection nozzle 1 cannot be inserted into the gaps between the rebar joints 24, making it difficult to inject grout into the sleeve 26 of the rebar joint 24 located at the back.

[0061] The injection nozzle 1 of Example 5 has a wide, flat shape, and can be inserted into the gaps in the reinforcing bar joints 24, so that the filler can also be injected into the sleeve 26 located deep inside.

[0062] An example of the procedure for using the injection nozzle 1 of the fifth embodiment attached to the injector 21 will be described. (1) The syringe connector 16 of the injection nozzle 1 is connected to the end of the filler storage section 22 of the syringe 21 and attached.

[0063] (2) The injection port 4 and the suction port 5 are left open. (The injection port tip 4a is not attached to the injection part 3, and the suction port cover 11 with the check valve is not attached to the suction port 5.) (3) The injection nozzle 1 is inserted into a container such as a kneading can containing the kneaded filler, and the shaft 23 is pulled to suck in the filler and store it in the filler storage section 22.

[0064] (4) The tip of the injection port 4a is attached to the injection part 3, and the suction hole cover 11 with a check valve is attached to the suction hole 5 to close the suction hole 5. (5) Insert the tip 4a of the injection nozzle 1 into the sleeve injection port 27 provided in the sleeve 26 of the rebar joint 24, and push the shaft 23 of the injector 21 to inject the filler into the sleeve 26. It is advisable to inject the filler until it overflows from the sleeve discharge port 28. [Explanation of symbols]

[0065] 1: Injection nozzle 2: Nozzle body 3: Injection part 4: Inlet 4a: Inlet tip 5: Suction hole 6: Suction hole opening / closing lid 7: Intake matching hole 8: Nozzle inner surface 9: Check valve for suction hole 10:Inner cover of suction hole 11: Intake hole cover with check valve 12: Body 13: Edge body 14: Perforated bottom 15: Check valve 16: Injector connection part 17: Connection notch 21: Injector 22: Filler storage section 23: Shaft 24: Reinforced concrete joint (mortar-filled joint) 25: Reinforced concrete 26: Sleeve 27: Sleeve inlet 28: Sleeve outlet

Claims

1. An injection nozzle is attached to the tip of an injector having a cylindrical filler storage section for storing a filler to be injected into the sleeve of a mortar-filled joint, and a piston-shaped shaft for suctioning the filler into the filler storage section and injecting the suctioned filler, a cylindrical syringe connection portion connected to a filler material storage portion of the syringe; A nozzle body; an injection port provided at a tip of the nozzle body and through which the filler is discharged when the shaft is pressed; an additional suction hole that is provided in the nozzle body separately from the injection port and that opens when the filler material is suctioned to suction the filler material; An injection nozzle comprising:

2. 2. The injection nozzle of claim 1, The nozzle body is provided with a suction hole opening / closing cover that covers the upper surface of the nozzle body and is rotatable around the axis of the nozzle, The suction hole opening / closing cover is provided with a suction matching hole, The suction hole of the nozzle body is opened by aligning the position of the suction alignment hole with the position of the suction alignment hole. The injection nozzle is characterized in that the suction hole and the suction matching hole are positioned at different positions, so that the suction hole is closed.

3. 2. The injection nozzle of claim 1, a tapered nozzle inner surface along the inner surface of the nozzle body; a check valve for a suction hole is provided, the check valve being formed by cutting off a part of a side surface of the nozzle inner surface body with a substantially circular cutout larger than the suction hole; A raised suction hole inner cover is formed in the center of the suction hole check valve, By positioning the suction hole of the nozzle body and the suction hole inner cover at different positions, the suction hole inner cover and the suction hole check valve are pressed, creating a gap in the notch of the suction hole check valve, thereby opening the suction hole, An injection nozzle characterized in that the suction hole is closed by aligning the position of the suction hole of the nozzle body with the position of the suction hole inner cover.

4. 2. The injection nozzle of claim 1, The suction hole can be closed by attaching a suction hole cover with a check valve to the suction hole, The suction hole cover with a check valve is a pipe along the inner surface of the suction hole; a rim provided on the upper portion of the tube in a direction perpendicular to the side surface of the tube; a perforated bottom provided in a rim-like shape at the lower part of the tube; a check valve attached to a portion of the perforated bottom and sized to close a hole in the perforated bottom; An injection nozzle comprising:

5. 5. The injection nozzle according to claim 4, The suction holes are provided in parallel next to the injection port, An injection nozzle characterized in that the suction hole is closed by attaching the suction hole cover with the check valve to the suction hole.

6. 2. The injection nozzle of claim 1, The nozzle body has a wide, flat shape, The suction holes are provided in parallel on the left and right of the injection port, The suction hole can be closed by attaching a suction hole cover with a check valve to the suction hole, The suction hole cover with a check valve is a pipe along the inner surface of the suction hole; a rim provided on the upper portion of the tube in a direction perpendicular to the side surface of the tube; a perforated bottom provided in a rim-like shape at the lower part of the tube; a check valve attached to a portion of the perforated bottom and sized to close a hole in the perforated bottom; An injection nozzle comprising:

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