Grout injector

Abstract

To provide a grout injector capable of improving workability by maintaining viscosity of grout filled inside a cartridge container at or below a certain viscosity at least during work.SOLUTION: In a grout injector 10 for injecting a main agent and a hardener of a two-liquid mixed grout filled inside a cartridge container 50 by ejecting them from inside the cartridge container 50, a planar heating element heater 18 for heating the main agent and the hardener inside the cartridge container 50 is provided at a location where the cartridge container 50 is loaded.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a grout injector, and more particularly to a grout injector that injects grout such as a resin liquid into a joint that joins two reinforcing bars at a construction site or the like. [Background technology]

[0002] At construction sites, when a pair of threaded rebars are connected in the same straight line, the ends of the pair of threaded rebars are inserted into both ends of a cylindrical joint, and then grout such as epoxy resin is injected through an injection port formed in the center of the joint to join the pair of threaded rebars and the joint (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-13675 Summary of the Invention [Problem to be solved by the invention]

[0004] The viscosity of grout changes depending on the material temperature. Specifically, the lower the material temperature, the higher the viscosity, and the higher the material temperature, the lower the viscosity. High viscosity results in low injection workability, and low viscosity results in high injection workability. Although injection work is possible even with low injection workability, the amount of grout ejected from the container is reduced. This results in a longer operation time required to complete the injection of the required amount of grout, and reduced operation efficiency.

[0005] Furthermore, if nothing is done, the material temperature will be approximately the same as the outside air temperature. In this case, if the outside air temperature (material temperature) is about 15°C to 40°C, the injection workability is sufficient. However, if the outside air temperature (material temperature) is about 10°C or less, the injection workability becomes extremely poor. And when the outside air temperature (material temperature) drops and the viscosity increases, the flow rate of the grout flowing out from the outlet of the container decreases, and the resistance to the injector increases. Also, when an injection is performed that greatly exceeds the resistance with a manual injector or an automatic injector such as an electric injector, the grout in the container will flow back from the gap between the piston and the cylinder at the rear end of the container. This backflowing grout cannot be used for work.

[0006] In the past, grout was sometimes heated before use. In this case, the general method of heating was to immerse the grout in its container in hot water or to leave it in a warm room. When using hot water, the grout is generally heated by placing the grout in its container in a bathtub that is heated with an electric heater that uses an AC 100 volt power source, known as a throw-in heater, and then used. This resulted in the following problems (1) to (3). (1) Heating is only possible in locations close to a 100 volt AC power source. (2) If the outside air temperature is low compared to the material temperature, the material will lose heat during the injection process and become lower than necessary. (3) If the grout temperature drops and the viscosity increases before it is completely used up, or if the grout in the container runs out during the work and more grout is needed, you must go to the heating area to get the heated grout.

[0007] Therefore, a technical problem arises that must be solved in order to provide a grout injector that can improve workability by maintaining the viscosity of the grout filled inside the cartridge container at a certain viscosity or lower at least during operation, and the present invention aims to solve this problem. [Means for solving the problem]

[0008] The present invention has been proposed to achieve the above-mentioned object, and the invention described in claim 1 provides a grout injector that injects grout filled inside a cartridge container by ejecting it from inside the cartridge container between a pair of reinforcing bars and a joint that joins the pair of reinforcing bars, and which provides a surface heating element heater at the location where the cartridge container is loaded to heat the grout in the cartridge container.

[0009] According to this configuration, the heat generated by the sheet heater is applied from the outside of the cartridge container to the grout inside the cartridge container, and the temperature of the grout inside the cartridge container can be adjusted to a temperature at which the grout has an optimal viscosity for the work. Therefore, the viscosity of the grout can be kept at a state suitable for the work until the last grout in the cartridge container is used up or the work is completed. This is expected to improve workability and finish.

[0010] The invention described in claim 2 provides a grout injector having the configuration described in claim 1, wherein the planar heating element heater has a planar heating panel heater consisting of a resin film and an aluminum foil circuit formed on the resin film, and generates heat when electricity is passed through the aluminum foil circuit.

[0011] According to this configuration, a commercially available rechargeable battery such as a lithium ion battery can be used as the power source, and a planar heating panel heater composed of an aluminum foil circuit and a resin film can be used as the heat source. In this case, since both the power source and the heat source are lightweight, the injector can carry them at all times and work while heating the grout, so heating before the injecting work is not essential. In addition, if more power than necessary is supplied to the planar heating panel heater, the resin film constituting the planar heating panel heater melts, the current is cut off, and heating stops, so the possibility of a serious accident such as a fire is significantly reduced. Furthermore, by adjusting the amount of power supplied to the planar heating panel heater or adjusting the power density of the planar heating panel heater at the time of design, the heating characteristics and heating temperature can be changed, and a product that matches the outside air temperature zone in which the planar heating element heater is used can be selected and used.

[0012] The invention described in claim 3 provides a grout injector in the configuration described in claim 2, wherein the planar heating element heater can adjust the heating temperature of the grout by adjusting the current flowing to the aluminum foil circuit.

[0013] According to this configuration, by adjusting the current flowing through the aluminum foil circuit depending on the type of grout being used, it is possible to obtain the optimal heating temperature for the grout being used, and to apply the optimal temperature for the grout being used. Effect of the Invention

[0014] According to the present invention, the heat generated by the planar heating element heater is applied from the outside of the cartridge container to the grout inside the cartridge container, and the temperature of the grout in the cartridge container can be heated to a temperature at which the grout has an optimum viscosity for use. Therefore, the viscosity of the grout can be kept at a suitable state for use until the last grout in the cartridge container is used up or until the work is completed. This is expected to improve workability and finish. [Brief description of the drawings]

[0015] [Figure 1] 1A and 1B are overall views showing an example of a manual injection type grout injector, which is an embodiment of the present invention, with a cartridge container loaded, where (a) is a side view and (b) is a top view. [Diagram 2] FIG. 2 is a top view of the grout injector shown in FIG. 1 with a cartridge container removed to show the internal structure. [Diagram 3] 3 shows a planar heating element heater provided in the grout injector shown in FIG. 1 and FIG. 2, in which (a) is an overall view thereof, and (b) is a partially enlarged view seen from the direction of the arrow AA in (a). [Figure 4] FIG. 3 shows an example of a cartridge container to be loaded into the grout injector shown in FIG. 1 and FIG. 2, in which (a) is a side view showing the state in which the injection nozzle is removed, and (b) is a view seen from the direction of arrow BB in (a). [Diagram 5] This is a diagram showing the verification results of the discharge amount when two workers, Worker A and Worker B, performed epoxy resin injection work under different conditions. [Figure 6] FIG. 11 is a diagram showing an example of a surface temperature rise value by voltage and a recommended usage environment temperature. [Figure 7] FIG. 11 is a diagram showing an example of a surface temperature rise value by power density. [Figure 8] 11A and 11B are overall views showing an electric automatic injection type grout injector with a cartridge container loaded therein, in accordance with another embodiment of the present invention, where (a) is a side view and (b) is a top view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In order to achieve the object of providing a grout injector that can improve workability by maintaining the viscosity of the grout filled inside a cartridge container at or below a certain viscosity at least during operation, the present invention has been realized by providing a grout injector that injects the grout filled inside a cartridge container by ejecting it from within the cartridge container, and a surface heating element heater that heats the grout inside the cartridge container is provided at the location where the cartridge container is loaded. EXAMPLES

[0017] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following embodiment, when the number, value, amount, range, etc. of components are mentioned, the number is not limited to the specific number, and may be more or less than the specific number, unless otherwise specified or when it is clearly limited to a specific number in principle.

[0018] In addition, when referring to the shape or positional relationship of components, etc., this includes things that are substantially similar or approximate to those shapes, etc., unless otherwise specified or considered to be clearly different in principle.

[0019] In addition, the drawings may exaggerate characteristic parts to make the features easier to understand, and the dimensional ratios of the components may not be the same as the actual ones. In addition, in cross-sectional views, hatching of some components may be omitted to make the cross-sectional structure of the components easier to understand.

[0020] In the following description, the expressions indicating directions such as up, down, left, right, etc. are not absolute, but are appropriate when each part of the grout injector of the present invention is in the illustrated position, but if the position is changed, the expressions should be interpreted in accordance with the change in position. Also, the same elements are given the same reference numerals throughout the description of the embodiment.

[0021] 1 and 2 show a grout injector 10 according to one embodiment of the present invention, and a cartridge container 50 that is loaded into the grout injector 10 for use. The grout injector 10 in this embodiment is a grout injector that injects grout such as epoxy resin into a joint that joins two reinforcing bars at a construction site or the like, and the grout filled in the cartridge container 50 is, for example, a two-component resin.

[0022] Examples of two-component resins include silicone-based, polyurethane-based, polysulfite-based, modified silicone-based, and epoxy resin-based resins. The following description focuses on the use of epoxy resin-based grout (hereinafter simply referred to as "epoxy resin").

[0023] An example of a cartridge container 50 filled with a two-component resin is shown in FIG. 4. The cartridge container 50 shown in FIG. 4 has an interior divided into two filling chambers, a filling chamber 51A and a filling chamber 51B, which are arranged parallel to each other in the longitudinal direction. For example, the filling chamber 51A is filled with a base agent (liquid A), and the filling chamber 51B is filled with a hardener (liquid B). The filling chamber 51A and the filling chamber 51B are each provided with an outlet 51a and an outlet 51b at their tip ends (front end sides), and a male thread connecting portion 51C is provided at the tip end portion, which has a male thread formed on the outer circumferential surface to attach a nozzle 52, in a manner that combines the outlet 51a and the outlet 51b. A nozzle 52 having a female thread connecting portion 52a with a female thread formed on the inner circumferential surface is attached to the male thread connecting portion 51C by screwing the female thread connecting portion 52a to the male thread connecting portion 51C, in a manner that combines the outlet 51a and the outlet 51b. On the other hand, a compression section (not shown) is provided at the rear end side of the cartridge container 50 for receiving pressure from piston section 17A and piston section 17B (described later) of the grout injector 10, respectively, to feed the two-component resin in the cartridge container 50 from discharge port 51a and discharge port 51b into nozzle 52, and further injecting the two-component resin from the tip of nozzle 52. The compression section has a compression section for filling chamber 51A and a compression section for filling chamber 51B.

[0024] The grout injector 10 is generally known as a resin injection gun used to inject grout such as epoxy resin into the inside of a joint that joins two reinforcing bars (a pair of reinforcing bars) at a construction site or the like, and has a cylindrical body 11. The cylindrical body 11 is provided with a container storage chamber 12 for loading and holding a cartridge container 50 therein, and an opening 13 leading to the inside of the container storage chamber 12 is provided on the upper surface of the cylindrical body 11. The cartridge container 50 is loaded in the container storage chamber 12 in a state of being laid back and forth. In addition, an elastic locking piece 14 is provided in the container storage chamber 12 to detachably support the loaded cartridge container 50. The cylindrical body 11 is provided with a cutout recess 15 for allowing a nozzle 52 attached to the front end of the cartridge container to escape when the cartridge container 50 is loaded into the container storage chamber 12.

[0025] Further, the cylindrical body 11 is provided with a trigger handle 16, a rod 17 connected to the trigger handle 16, and a sheet heating element heater 18.

[0026] The trigger handle 16 is attached to the cylindrical body 11 in the same manner as a typical resin injection gun, so as to be able to swing back and forth. Normally, it is held in a locked position rotated forward. When the operator grasps it with his or her hand, it is rotated rearward, and is connected to the rod 17 so that the rod 17 can be gradually advanced toward the front end as it rotates.

[0027] The rod 17 is attached to the cylindrical body 11 so as to be slidable in the front-rear direction. A piston portion 17A that applies a compressive force from the rear end side to the compressed portion of the filling chamber 51A in the cartridge container 50, and a piston portion 17B that applies a compressive force from the rear end side to the compressed portion of the filling chamber 51B are provided at the tip of the rod 17. That is, when the rod 17 is moved to the front end side in conjunction with the trigger handle 16, the piston portion 17A and the piston portion 17B are pressed integrally with the rod 17 against the compressed portion of the cartridge container 50, and the two-component resin in the cartridge container 50 can be discharged.

[0028] The sheet heating element heater 18 is composed of a sheet heating panel heater 19, a controller 20, an electric cable 21 electrically connecting the sheet heating panel heater 19 and the controller 20, and the like.

[0029] The planar heating panel heater 19 is a flexible sheet-like heating panel that is made of a resin film and an aluminum foil circuit formed by printing an aluminum material on the resin film, and generates heat when electricity is applied to the aluminum foil circuit. The planar heating panel heater 19 is disposed in the container storage chamber 12 via a heater mounting base 22 disposed in the container storage chamber 12 of the cylindrical body 11. As shown in FIG. 3(b), the inner peripheral surface of the heater mounting base 22 is formed as a curved surface having approximately the same curvature as the outer peripheral curved surface of the filling chamber 51A in the cartridge container 50. The planar heating panel heater 19 is bent and attached to the inner peripheral surface of the heater mounting base 22 with approximately the same curvature as the outer peripheral curved surface of the filling chamber 51A, and is fixed and disposed in the container storage chamber 12 together with the heater mounting base 22 in a state of being in close contact with the outer peripheral curved surface of the filling chamber 51A in the cartridge container 50.

[0030] Although not shown, the controller 20 is provided with an internal rechargeable battery and a control circuit for controlling the current flowing from the battery to the planar heating panel, as well as a control circuit and an externally operable switch for turning the current from the battery on and off. The controller 20 and the planar heating panel heater 19 are electrically connected by an electric cable 21. A predetermined electric power is supplied to the planar heating panel heater 19 from the control circuit, which is adjusted according to the type of epoxy resin filled in the cartridge container 50.

[0031] The operation of the grout injector 10 thus configured will be described below. When using the grout injector 10 to inject the epoxy resin filled in the cartridge container 50, the cartridge container 50 containing the base agent (liquid A) and the hardener (liquid B) and having the nozzle 52 attached thereto is prepared, and the cartridge container 50 is loaded into the container storage chamber 12. Then, with the nozzle 52 protruding from the front side of the cylindrical body 11, the cartridge container 50 is detachably held in the container storage chamber 12 of the cylindrical body 11 by the elastic locking piece 14. In addition, in this filled state, the planar heating panel heater 19 is in almost intimate contact with the outer circumferential surface of the cartridge container 50. FIG. 1 shows this intimate contact state.

[0032] Next, when the switch provided on the controller 20 is turned on, a voltage is applied from the battery to the aluminum foil circuit of the sheet heating element heater 18 via the control circuit and the electric cable 21. When the voltage is applied, the aluminum foil circuit generates heat, and the entire sheet heating element heater 18 is heated. When the sheet heating element heater 18 is heated, the cartridge container 50 that is in close contact with the sheet heating element heater 18 is heated by the heat generated by the sheet heating element heater 18 and warms up, and at the same time, the epoxy resin in the cartridge container 50 is also heated and warmed up to a suitable temperature for use. This reduces the viscosity of the epoxy resin to a viscosity suitable for use. Also, when the epoxy resin in the cartridge container 50 is heated and the viscosity of the epoxy resin is reduced, the trigger handle 16 is grasped and pulled. Then, the rod 17 is moved forward together with the piston portion 17A and the piston portion 17B, and the piston portion 17A and the piston portion 17B are pressed against the compression portion of the cartridge container 50, causing the two-component resin in the cartridge container 50 to be discharged. In this case, since the viscosity of the epoxy resin is reduced, the two-component resin is smoothly sent into the nozzle 52 through the discharge ports 51a and 51b, and further the two-component resin (epoxy resin) can be simultaneously injected from the tip of the nozzle 52. This makes it possible to easily inject grout such as epoxy resin into the inside of a joint that joins a pair of reinforcing bars at a construction site or the like.

[0033] Therefore, according to the grout injector 10 of this embodiment, heat generated by the sheet heating element heater 18 is applied to the grout filled inside the cartridge container 50 from the outside of the cartridge container 50, and the temperature of the grout inside the cartridge container 50 can be heated to a heating temperature at which the grout has an optimum viscosity for work. Therefore, the viscosity of the grout can be kept at a state suitable for work until the last grout filled inside the cartridge container 50 is used up or until the work is completed. This is expected to improve workability and finish.

[0034] 5 shows the results of verifying the difference in the amount of epoxy resin discharged when two workers, Worker A and Worker B, performed the epoxy resin injection work without heating (1), when the planar heating element heater 18 of this embodiment was provided and the epoxy resin in the cartridge container 50 was heated for 10 minutes (2), and when the epoxy resin was heated for 15 minutes (3). As a result, the average amount of epoxy resin discharged (g) when the work was performed without heating (1) was 0.77 (g). On the other hand, the average amount of epoxy resin discharged (g) when the work was performed with heating for 10 minutes (2) was 3.2 (g), which was 2.43 (g) different from the amount of epoxy resin discharged without heating (1), and the ratio of the amount of epoxy resin discharged was 422.3 (%). Next, the average amount of epoxy resin discharged (g) when heated for 15 minutes (3) was 3.77 (g), a difference of 3.00 (g) from when not heated (1), and the discharge ratio was 497.9 (%). Therefore, it was found that the amount of epoxy resin discharged was improved when the work was done with heating compared to when it was not heated, and it was found that improvements in workability and finish can be expected.

[0035] In addition, according to the grout injector 10 of this embodiment, the planar heating element heater 18 is formed of a planar heating panel heater 19 consisting of a resin film and an aluminum foil circuit formed on the resin film, and heat is generated by passing electricity through the aluminum foil circuit, so that the optimal heating temperature for the grout to be used can be obtained. Therefore, a commercially available rechargeable battery such as a lithium ion battery can be used as a power source. In addition, the battery can be used as a heat source for the planar heating panel heater 19 consisting of an aluminum foil circuit and a resin film. In this case, since both the power source and the heat source are lightweight, the injector can carry them with him at all times and work while heating the grout. Therefore, there is no need to heat the grout before the injection work, as was done in the past. In addition, if more power than necessary is supplied to the planar heating panel heater 19, the resin film constituting the planar heating panel heater 19 melts, the current is cut off, and heating stops, so the possibility of a serious accident such as a fire is significantly reduced.

[0036] FIG. 6 shows an example of the surface temperature rise value by voltage and the recommended environmental temperature for use, and FIG. 7 shows an example of the surface temperature rise value by power density. From FIG. 7, it can be seen that when the input voltage (V) to the planar panel heater 19 is increased, the surface temperature (°C) of the planar panel heater 19 also rises, and the recommended environmental temperature (°C) changes accordingly. On the other hand, from FIG. 7, it can be seen that when the power density (W / cm2) of the planar panel heater 19 is decreased, the surface temperature (°C) of the planar panel heater 19 also falls, and the recommended environmental temperature (°C) changes accordingly. From these facts, it is possible to change the heating characteristics and heating temperature by adjusting the amount of power supplied to the planar panel heater 19 and the power density of the planar panel heater 19 during design, and it is also possible to select and use a product that matches the outside air temperature zone in which the planar panel heater 19 will be used.

[0037] In the above embodiment, the grout injector 10 in which the grout is injected manually has been described as an example, but the present invention can also be applied to a grout injector in which the grout is injected automatically. An example of such a grout injector is shown in Fig. 8. Here, the same or corresponding parts as those in Figs. 1 to 4 are designated by the same reference numerals as those in Figs. 1 to 4, and their explanations are omitted. The following mainly describes the differences from the grout injector 10 in which the grout is injected manually as shown in Figs. 1 to 4.

[0038] 8, a grout injector 10A that automatically injects grout is provided with an electric drive unit 25 that automatically moves the rod 17, together with the piston portion 17A and the piston portion 17B, to the front at the rear of the cylindrical body 11 in which the cartridge container 50 is loaded. In the case of this grout injector 10A, a sheet heating element heater 18 is also provided in the container storage chamber 12 of the cylindrical body 11. A drive battery 26 is replaceably attached to the electric drive unit 25 in addition to the battery for the sheet heating element heater 18. A switch 27 that turns the drive of the electric drive unit 25 on and off is also provided on the electric drive unit 25.

[0039] Then, when the switch provided in the controller 20 is turned on and a voltage is applied to the aluminum foil circuit of the sheet heating element heater 18 from the battery through the control circuit and the electric cable 21, the aluminum foil circuit generates heat and the entire sheet heating element heater 18 is heated. When the sheet heating element heater 18 is heated, the cartridge container 50 that is in close contact with the sheet heating element heater 18 is heated, and at the same time, the epoxy resin in the cartridge container 50 is heated. This reduces the viscosity of the epoxy resin. Thus, when the cartridge container 50 and the epoxy resin are heated and the viscosity of the epoxy resin is reduced, the switch 27 is turned on to drive the electric drive unit 25, and the rod 17 is moved forward together with the piston portion 17A and the piston portion 17B by the feeding operation of the electric drive unit 25. Then, the piston portion 17A and the piston portion 17B are pressed against the compression portion of the cartridge container 50, causing the two-component resin in the cartridge container 50 to be discharged. In this case, since the viscosity of the epoxy resin is reduced, the two-component resin is smoothly sent into the nozzle 52 through the discharge ports 51a and 51b, and the two-component resin can be simultaneously injected from the tip of the nozzle 52.

[0040] In this embodiment, the cartridge container 50 is filled with a two-component resin, but the present invention is not limited to a two-component resin. Furthermore, the present invention can be modified in various ways without departing from the spirit of the present invention, and it is natural that the present invention covers such modifications. [Explanation of symbols]

[0041] 10, 10A: Grout injector 11: Cylindrical body 12: Container storage room 15: Notch recess 16: Trigger handle 17: Rod 17A: Piston section 17B: Piston section 18: Planar heating element heater 19: Surface heating panel heater 20: Controller 22: Heater mounting base 50: Cartridge container 51A: Filling chamber 51B: Filling chamber 52: Nozzle

Claims

1. A grout injector that injects grout filled in a cartridge container from inside the cartridge container between a pair of reinforcing bars and a joint that joins the pair of reinforcing bars, A sheet heating element heater for heating the grout in the cartridge container is provided at a location where the cartridge container is loaded. A grout injector comprising:

2. The planar heating element heater has a planar heating panel heater composed of a resin film and an aluminum foil circuit formed on the resin film, and generates heat by passing electricity through the aluminum foil circuit.

2. The grout injector of claim 1 .

3. The planar heating element heater can adjust the heating temperature of the grout by adjusting the current supply to the aluminum foil circuit.

3. The grout injector of claim 2.

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