Injection device and cleaning and removal method

Abstract

To provide an injection apparatus suitable for construction work in a narrow part; and to provide a cleaning / removing method.SOLUTION: An injection apparatus 10 provided with a hand gun 12 whose tip end has a nozzle head 26 for spraying an injection material, further comprises direction / angle adjustment means 24 for adjusting an injection direction or an injection angle of the injection material from the tip end of the hand gun 12. The nozzle head 26 is rotatably mounted on the tip end of the hand gun 12, and the direction / angle adjustment means 24 may change the direction of the nozzle head 26 relative to the tip end of the hand gun 12 at a remote position away from the nozzle head 26.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an injection device and a cleaning and removal method using the same.

Background Art

[0002] Conventionally, in asbestos removal work associated with building renovation and demolition work, a water jet gun that injects ultra-high pressure water may be used (see, for example, Patent Document 1). As shown in FIG. 5(1), this water jet gun injects ultra-high pressure water in a spiral while rotating it around the axis C from a rotary nozzle 2 that rotates at high speed around the axis C at the tip of the pipe 1, and sprays it onto the surface layer of the object 3 located on the extension line of the axis C to clean and peel off the surface layer. This method has the advantage that the burden on the worker is smaller compared to the cleaning and peeling work by human hands, and the cleaning and peeling work can be performed efficiently.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as shown in FIG. 5(2), in a narrow part such as between the outer wall panel 4 and the steel frame beam 5, it is difficult to remove the object 6 to be removed on the surface layer of the steel frame beam 5 by applying the above-described conventional water jet gun. Therefore, it is necessary to remove the object 6 to be removed manually using a trowel or the like, which causes problems such as an increase in the construction period and cost. Furthermore, when the human hand cannot reach, it is necessary to perform isolation curing by covering the entire work area including the external scaffold with a sheet or the like, and then manually remove it again after removing the outer wall panel. In this method, since external curing work and outer wall panel removal work occur, there is a problem that an enormous construction period and cost are required. For these reasons, there has been a demand for a device suitable for construction work such as removal in a narrow part.

[0005] The present invention has been made in view of the above, and an object thereof is to provide an injection device and a cleaning and removal method suitable for construction work in a narrow part.

Means for Solving the Problems

[0006] In order to solve the above-described problems and achieve the object, an injection device according to the present invention is an injection device including a hand gun having a nozzle head for injecting an injection material at a tip, and further includes direction angle adjustment means for adjusting an injection direction or an injection angle of the injection material from the tip of the hand gun. The nozzle head is rotatably attached to an angle adjustment mechanism provided at the tip of the hand gun. This angle adjustment mechanism has a sealed housing that is rotatably fixed to the tip of the hand gun. The housing has an inlet for introducing the injection material, a linear flow path that communicates with the inlet and supplies the injection material to the nozzle head, a drive-side rotating part connected to an output shaft of a drive source for rotating the nozzle head around its own axis, and a nozzle head-side rotating part that engages with the drive-side rotating part and engages with the rotation axis of the nozzle head. A rotation drive mechanism is provided. The inlet, the flow path, and the rotation axis of the nozzle head are arranged on the same straight line, and the rotation axis of the drive-side rotating part of the rotation drive mechanism intersects the flow path. The inside of the housing is purged with air to improve airtightness.

[0007] Further, another injection device according to the present invention is characterized in that, in the above-described invention, the direction angle adjustment means adjusts the injection direction or the injection angle of the injection material from the tip of the hand gun by changing the orientation of the nozzle head with respect to the tip of the hand gun at a remote position away from the nozzle head.

[0008] Further, another injection device according to the present invention is an injection device provided with a handgun having a nozzle head for injecting an injection material at its tip in the above-described invention, and further includes direction angle adjustment means for adjusting the injection direction or injection angle of the injection material from the tip of the handgun. The nozzle head is rotatably attached around the axis of the handgun at the tip of the handgun and has an injection nozzle for injecting in a direction perpendicular to the axis of the handgun. The direction angle adjustment means is characterized by being composed of a shielding member provided on the outlet side of the injection nozzle.

[0009] Further, another injection device according to the present invention is an injection device in the above-described invention, wherein the handgun has a telescopic rod that can be telescoped in the longitudinal direction, and the nozzle head is attached to the tip side of this telescopic rod.

[0010] Further, a cleaning and removal method according to the present invention is a method for cleaning and removing the surface of an object to be constructed using the above-described injection device. While operating the handgun and placing the nozzle head at the tip of the handgun in the vicinity of the surface of the object to be constructed, the injection direction or injection angle of the injection material from the tip of the handgun is adjusted by the direction angle adjustment means to enable the injection material to be injected from the nozzle head toward the surface of the object to be constructed. Then, the surface of the object to be constructed is cleaned and removed by injecting the injection material from the nozzle head toward the surface of the object to be constructed.

Effects of the Invention

[0011] According to the injection device of the present invention, it is an injection device provided with a handgun having a nozzle head for injecting an injection material at its tip, further comprising direction angle adjustment means for adjusting the injection direction or injection angle of the injection material from the tip of the handgun. The nozzle head is rotatably attached to an angle adjustment mechanism provided at the tip of the handgun. This angle adjustment mechanism has a sealed housing that is rotatably fixed to the tip of the handgun. In this housing, there is an inlet for introducing the injection material, a linear flow path that communicates with this inlet and supplies the injection material to the nozzle head, a drive-side rotating part connected to the output shaft of a drive source for rotating the nozzle head around its own axis, and a nozzle head-side rotating part that engages with this drive-side rotating part and also engages with the rotation axis of the nozzle head. A rotation drive mechanism is provided. The inlet, the flow path, and the rotation axis of the nozzle head are arranged on the same straight line, and the rotation axis of the drive-side rotating part of the rotation drive mechanism intersects the flow path. Since the inside of the housing is purged with air to improve airtightness, the injection material can be appropriately injected from the nozzle head arranged in a narrow part toward the construction object. Therefore, it is possible to provide an injection device suitable for construction work in a narrow part, which has the effect of being able to provide an injection device suitable for construction work in a narrow part. Also, it has the effect of reducing pressure loss and efficiently injecting the injection material.

[0012] Further, according to another injection device of the present invention, the direction angle adjustment means adjusts the injection direction or injection angle of the injection material from the tip of the handgun by performing a change operation on the orientation of the nozzle head with respect to the tip of the handgun at a remote position away from the nozzle head. Therefore, it has the effect that the injection direction or injection angle of the injection material from the tip of the handgun can be easily adjusted, for example, at hand.

[0013] According to another injection device of the present invention, there is provided an injection device including a handgun having a nozzle head for injecting an injection material at its tip, further comprising direction angle adjustment means for adjusting the injection direction or injection angle of the injection material from the tip of the handgun. The nozzle head is rotatably attached around the axis of the handgun at the tip of the handgun and has an injection nozzle for injecting in a direction perpendicular to the axis of the handgun. Since the direction angle adjustment means is composed of a shielding member provided on the outlet side of the injection nozzle, it is possible to adjust the injection direction or injection angle of the injection material from the tip of the handgun with a simple configuration.

[0014] According to another injection device of the present invention, the handgun has a telescopic rod that can be telescoped in the longitudinal direction, and the nozzle head is attached to the tip side of this telescopic rod. Therefore, it is possible to easily reach and enter the nozzle head into a narrow part at a high place.

[0015] According to the cleaning and removal method of the present invention, there is provided a method for cleaning and removing the surface of a construction object using the above-described injection device. The method includes operating the handgun to place the nozzle head at the tip of the handgun near the surface of the construction object, while adjusting the injection direction or injection angle of the injection material from the tip of the handgun by the direction angle adjustment means to enable injection of the injection material from the nozzle head toward the surface of the construction object, and then injecting the injection material from the nozzle head toward the surface of the construction object to clean and remove the surface of the construction object. Therefore, it is possible to appropriately inject the injection material from the nozzle head arranged in the narrow part toward the construction object and clean and remove its surface, thus providing an effect of being able to provide a cleaning and removal method suitable for construction work in a narrow part.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the injection device and the cleaning and removal method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by this embodiment.

[0018] (Embodiment 1) First, Embodiment 1 of the present invention will be described. As shown in FIGS. 1 and 2, the injection device 10 according to Embodiment 1 is an injection angle variable type device. This injection device 10 includes a substantially long shaft-shaped hand gun 12, a tip part 14 provided at the tip of the hand gun 12, a hand handle 16 provided on the base side of the hand gun 12, a telescopic rod 18, a vibration-proof handle 20, and a shoulder contact member 22. The tip part 14 has an angle adjustment mechanism 24 and a nozzle head 26.

[0019] As shown in FIG. 1, the angle adjustment mechanism 24 includes an annular bracket 28A, a plate-shaped bracket 28B, and a rectangular parallelepiped box-shaped housing 30. The annular bracket 28A is rotatably attached around the axis C at the tip of the handgun 12 and is rotatable around the axis C by a motor (not shown). The plate-shaped bracket 28B is fixed to the side portion of the bracket 28A and extends in the axial direction. The housing 30 is rotatably fixed to the inner surface side of the bracket 28B. The front surface of the housing 30 is fixed to the rotation shaft 32 of a motor (not shown) that protrudes in the normal direction from the inner surface of the bracket 28B, and the housing 30 is rotatable around the rotation shaft 32 by the drive of this motor. The angle adjustment mechanism 24 functions as the direction angle adjustment means of the present invention.

[0020] As shown in FIG. 3(1), an inlet 34 for introducing ultra-high pressure water (spray material) is provided on one side surface of the housing 30, and the nozzle head 26 is rotatably fixed around its own rotation shaft 36 on the other side surface. When the housing 30 is rotated by the angle adjustment mechanism 24, the orientation of the nozzle head 26 with respect to the tip of the handgun 12 can be changed around the rotation shaft 32. Thereby, the injection direction or injection angle of the ultra-high pressure water from the tip of the handgun 12 can be changed in an arbitrary direction. It is possible to inject from an optimal direction even onto the cleaning surface or removal surface of a complicated and narrow part. In the example of FIG. 3(1), the case of changing the injection angle to 45°, 90°, and 135° with the injection direction injecting in the axial direction C of the handgun 12 as a reference of 0° is shown, but the present invention is not limited to this, and it can also be changed to any injection angle other than these.

[0021] As shown in Fig. 4(1), inside the container 30, there are provided a linear flow path 38 that communicates with the inlet 34 and supplies ultra-high pressure water to the nozzle head 26, and a rotation drive mechanism 40 for rotating the nozzle head 26 around its rotation axis 36. The axis of the inlet 34, the flow path 38, and the rotation axis 36 of the nozzle head 26 are arranged on the same straight line. The container 30 is completely sealed from the outside so as to prevent pressure loss and the like due to water leakage. Further, air is sent into the inside of the container 30 through a vent hole (not shown) to purge the air, improving the sealing performance. By these means, the pressure loss can be reduced and ultra-high pressure water can be efficiently injected.

[0022] The rotation drive mechanism 40 includes a bevel gear 44 (drive-side rotating part) connected to the output shaft 42A of an air motor 42 (drive source) fixed to the back surface of the container 30, and a bevel gear 46 (nozzle head-side rotating part) that meshes with the bevel gear 44 and engages with the rotation axis 36 of the nozzle head 26. The angle at which the rotation axes (axis 36A, axis 42B) of the bevel gears 44 and 46 intersect is 90°. A through hole 48 is open at the center of the bevel gear 46, and this through hole 48 serves as the flow path 38 for passing ultra-high pressure water. The rotation axis 42B of the bevel gear 44 intersects the flow path 38. In this configuration, the rotational force of the output shaft of the air motor 42 can be transmitted to the rotation axis 36 of the nozzle head 26 via the bevel gears 44 and 46.

[0023] The nozzle head 26 is fixed to the housing 30 so as to be rotatable around the rotation axis 36, and has an injection nozzle 50 that injects ultra-high pressure water in a direction parallel to the axis of the rotation axis 36. A plurality of injection nozzles 50 are arranged at intervals on the circumference centered on the axis of the rotation axis 36 of the nozzle head 26. The rotation axis 36 of the nozzle head 26 engages with a rotation drive mechanism 40 in the housing 30, and the nozzle head 26 rotates at high speed by the rotational force transmitted from this rotation drive mechanism 40. Further, the base side of the injection nozzle 50 communicates with the outlet of the flow path 38 in the housing 30, and the injection nozzle 50 injects the ultra-high pressure water supplied through this flow path 38. Therefore, the nozzle head 26 can inject ultra-high pressure water while rotating at high speed. Thereby, cleaning and peeling removal operations can be performed efficiently.

[0024] The hand-held handle 16 is a handle for an operator to grip, and is composed of a shaft body extending in the direction of the axis C. The lower part of the hand-held handle 16 has a structure that can be expanded and contracted in the longitudinal direction in consideration of ease of operation. A hand switch 52 is provided near the hand-held handle 16. The hand switch 52 has an injection operation unit 52A that simultaneously executes and stops the injection of ultra-high pressure water from the nozzle head 26 and the high-speed rotation of the nozzle head 26, and an angle operation unit 52B that drives the angle adjustment mechanism 24 to adjust the orientation of the nozzle head 26. The injection operation unit 52A is composed of a switch lever 16A that the operator pulls manually. The angle operation unit 52B functions as a direction angle adjustment means for changing the orientation of the nozzle head 26 with respect to the tip of the handgun 12 at a remote position away from the nozzle head 26. By this angle operation unit 52B, the injection direction or injection angle of the ultra-high pressure water from the tip of the handgun 12 can be easily adjusted manually. The hand switch 52 may have a safety lock mechanism for preventing malfunction.

[0025] The telescopic rod 18 is an elongated shaft-like member that connects the tip part 14 and the hand-held handle 16, and is configured to be telescopic in the longitudinal direction. Since the telescopic rod 18 has an elongated shape and can be telescoped, by extending it, the tip part 14 can be easily reached and inserted into a narrow and high place.

[0026] The anti-vibration handle 20 is an auxiliary handle that supports the reaction force of the tip part 14 which is the injection part, and reduces the burden on the operator. It is attached to the telescopic rod 18. The attachment position of the anti-vibration handle 20 with respect to the telescopic rod 18 can be arbitrarily adjusted.

[0027] The shoulder rest member 22 is a rod-shaped member that reduces the burden on the operator by receiving and supporting the weight of the device on the operator's shoulder. It is attached to the telescopic rod 18. The attachment position of the shoulder rest member 22 with respect to the telescopic rod 18 can be arbitrarily adjusted. Note that the shoulder rest member 22 is not limited to a rod-shaped member, and a structure that hangs it on the shoulder using a belt or the like may be adopted.

[0028] As shown in FIG. 2, this injection device 10 is used by being connected to a jet pump 54, a compressor, and a pressure regulator 56. The jet pump 54, the compressor, and the pressure regulator 56 are used as a drive source for a pneumatic motor 42 for rotating the nozzle head 26 at high speed, a drive source for air purging of the housing 30, and a drive source for generating and injecting ultra-high pressure water. The jet pump 54, the compressor, and the pressure regulator 56 are connected to the tip part 14 by a flexible pressure-resistant pipe 58. The ultra-high pressure water generated by the jet pump 54, the compressor, and the pressure regulator 56 is supplied from the pressure-resistant pipe 58 to the tip part 14 side.

[0029] The operation and action of the above configuration will be described. As shown in FIG. 3(2), first, hold the handgun 12 and insert the tip part 14 into the narrow part between the outer wall panel 4 and the steel frame beam 5. While in this state, drive the angle adjustment mechanism 24 with the angle operation part 52B of the hand switch 52 outside the figure, and direct the nozzle head 26 toward the object 6 (for example, asbestos) to be removed on the surface layer of the steel frame beam 5. Subsequently, start the injection of ultra-high pressure water from the nozzle head 26 and the high-speed rotation of the nozzle head 26 with the injection operation part 52A of the hand switch 52. Thereby, the ultra-high pressure water is injected while the nozzle head 26 rotates at high speed. The injected ultra-high pressure water collides with the object 6 to be removed, and the object 6 to be removed is peeled off and removed from the surface of the steel frame beam 5.

[0030] Next, as shown in FIG. 3(3), while in this state, the angle adjustment mechanism 24 is driven by the angle operation part 52B of the hand switch 52 outside the figure, and the orientation of the nozzle head 26 is slightly changed. By doing so, the ultra-high pressure water jetted from the nozzle head 26 collides with the object 6 to be removed near the area where the removal has been completed. As a result, the object 6 to be removed near the area where the removal has been completed can also be peeled off and removed in the same manner.

[0031] According to the first embodiment, the removal work of asbestos or the like can be easily performed using the injection device 10. In particular, even in a complicated location inside a building or in a narrow part, the removal work can be safely and efficiently carried out. Therefore, an injection device suitable for construction work in a narrow part can be provided.

[0032] According to the first embodiment, since the work can be efficiently performed in a shorter time than the conventional manual removal method, it leads to a significant reduction in processes and costs. If the injection device 10 is used for the removal work in a place where a person's hand cannot reach, the curing work outside and the removal work of the outer wall panel are also unnecessary, resulting in a significant reduction in man-hours. Further, in the conventional method, there is a risk that the dry asbestos powder may fly like smoke, whereas according to the first embodiment, since water is used, the asbestos dust is less likely to scatter than in the conventional method. Also, since it is used at ultra-high pressure, a small amount of water is sufficient. Furthermore, since the work can be carried out from the inside of the building and there is no need to climb to a high place to work, the work safety can be improved compared to the conventional method.

[0033] In the above-described first embodiment, the case where the injection device 10 is applied to the asbestos removal work has been described as an example, but the application of the injection device of the present invention is not limited to this work. For example, the injection device of the present invention can also be applied to cleaning and removal work of asbestos-containing adhesives, paints, dirt, etc., or chiseling work of concrete or the like. Even in this case, the same operational effects as described above can be obtained.

[0034] (Second Embodiment) Next, a second embodiment of the present invention will be described. As shown in Fig. 4(2), the injection device 100 according to the second embodiment is obtained by replacing the tip part 14 of the first embodiment described above with a horizontally-injecting type structure.

[0035] The nozzle head 60 is coaxially attached rotatably around the axis C of the handgun 12 at the tip of the handgun 12, and has an injection nozzle 62 that injects in a direction perpendicular to the axis C of the handgun 12. This injection nozzle 62 extends radially from the side of the rotation axis 64 of the nozzle head 60, and a plurality of them are provided at intervals in the circumferential direction of the nozzle head 60. On the left outer side (one of the outer sides) of the nozzle head 60, a shielding plate 66 (shielding member) is provided on the front surface of the outlet side of the injection nozzle 62 facing leftward. The shielding plate 66 functions as the direction angle adjusting means of the present invention. Since there is the shielding plate 66 on the left outer side of the nozzle head 60, in this configuration, it is possible to inject ultra-high pressure water only in the right direction (horizontal single direction) from the nozzle head 60.

[0036] According to the injection device 100 of the present embodiment, it is possible to adjust the injection direction or injection angle of ultra-high pressure water from the tip of the handgun 12 with a simple configuration.

[0037] As described above, according to the injection device of the present invention, there is provided an injection device including a handgun having a nozzle head for injecting an injection material at its tip, further comprising direction angle adjustment means for adjusting the injection direction or injection angle of the injection material from the tip of the handgun. The nozzle head is rotatably attached to an angle adjustment mechanism provided at the tip of the handgun. This angle adjustment mechanism has a sealed housing that is rotatably fixed to the tip of the handgun. The housing has an inlet for introducing the injection material, a linear flow path that communicates with the inlet and supplies the injection material to the nozzle head, a drive-side rotating part connected to the output shaft of a drive source for rotating the nozzle head around its own axis, and a nozzle head-side rotating part that engages with the drive-side rotating part and also engages with the rotation axis of the nozzle head. A rotation drive mechanism is provided. The inlet, the flow path, and the rotation axis of the nozzle head are arranged on the same straight line, and the rotation axis of the drive-side rotating part of the rotation drive mechanism intersects the flow path. Since the inside of the housing is purged with air to improve airtightness, the injection material can be appropriately injected from the nozzle head arranged in a narrow part toward the construction object. Therefore, an injection device suitable for construction work in a narrow part can be provided. Further, the pressure loss can be reduced and the injection material can be efficiently injected.

[0038] Also, according to another injection device of the present invention, the direction angle adjustment means adjusts the injection direction or injection angle of the injection material from the tip of the handgun by changing the orientation of the nozzle head with respect to the tip of the handgun at a remote position away from the nozzle head. Therefore, the injection direction or injection angle of the injection material from the tip of the handgun can be easily adjusted, for example, at hand.

[0039] According to another injection device of the present invention, there is provided an injection device including a handgun having a nozzle head for injecting an injection material at its tip, further comprising direction angle adjustment means for adjusting the injection direction or injection angle of the injection material from the tip of the handgun. The nozzle head is rotatably attached around the axis of the handgun at the tip of the handgun and has an injection nozzle for injecting in a direction perpendicular to the axis of the handgun. Since the direction angle adjustment means is composed of a shielding member provided on the outlet side of the injection nozzle, the injection direction or injection angle of the injection material from the tip of the handgun can be adjusted with a simple configuration.

[0040] According to another injection device of the present invention, the handgun has a telescopic rod that can be extended and retracted in the longitudinal direction, and the nozzle head is attached to the tip side of this telescopic rod. Therefore, the nozzle head can be easily reached and inserted into a narrow area at a high place.

[0041] According to the cleaning and removal method of the present invention, there is provided a method for cleaning and removing the surface of a construction object using the above-described injection device. The method includes operating the handgun to place the nozzle head at the tip of the handgun near the surface of the construction object, while adjusting the injection direction or injection angle of the injection material from the tip of the handgun by the direction angle adjustment means to enable injection of the injection material from the nozzle head toward the surface of the construction object, and then injecting the injection material from the nozzle head toward the surface of the construction object to clean and remove the surface of the construction object. Therefore, the injection material can be appropriately injected from the nozzle head arranged in a narrow area toward the construction object, and its surface can be cleaned and removed. Thus, a cleaning and removal method suitable for construction work in a narrow area can be provided.

Industrial Applicability

[0042] As described above, the injection device and the cleaning and removal method according to the present invention are useful for cleaning and removal operations on the surface of a structure, and are particularly suitable for construction work in a narrow area.

Explanation of Reference Numerals

[0043] 10,100 Injection device 12 Handgun 14 Tip part 16 Hand-held handle 18 Telescopic rod 20 Vibration-proof handle 22 Shoulder rest member 24 Angle adjustment mechanism (direction angle adjustment means) 26 Nozzle head 28A, 28B Brackets 30 Container 32, 36, 64 Rotation axes 34 Inlet 38 Flow path 40 Rotation drive mechanism 42 Air motor (drive source) 44 Bevel gear (drive-side rotating part) 46 Bevel gear (nozzle head-side rotating part) 48 Through hole 50, 62 Injection nozzles 52 Hand-held switch 54 Jet pump 56 Compressor and pressure regulator 58 Pressure-resistant piping 60 Nozzle head 66 Shielding plate (shielding member) Axis C

Claims

1. An injection device comprising a hand gun having a nozzle head for injecting an injection material at its tip, further comprising direction angle adjustment means for adjusting the injection direction or injection angle of the injection material from the tip of the hand gun, the nozzle head is rotatably attached to an angle adjustment mechanism provided at the tip of the hand gun, and this angle adjustment mechanism has a sealed housing that is rotatably fixed to the tip of the hand gun. The housing has an inlet for introducing the injection material, a linear flow path that communicates with this inlet and supplies the injection material to the nozzle head, a drive-side rotating part connected to the output shaft of a drive source for rotating the nozzle head around its own axis, and a nozzle head-side rotating part that engages with this drive-side rotating part and also engages with the rotation axis of the nozzle head. A rotation drive mechanism is provided, the inlet, the flow path, and the rotation axis of the nozzle head are arranged on the same straight line, and the rotation axis of the drive-side rotating part of the rotation drive mechanism intersects the flow path, The injection device is characterized in that the inside of the housing is purged with air to improve airtightness.

2. The direction angle adjustment means adjusts the injection direction or injection angle of the injection material from the tip of the hand gun by changing the orientation of the nozzle head with respect to the tip of the hand gun at a remote position away from the nozzle head. The injection device according to claim 1, characterized in that it is as described.

3. The hand gun has a telescopic rod that can be telescoped in the longitudinal direction, and the nozzle head is attached to the tip side of this telescopic rod. The injection device according to claim 1 or 2, characterized in that it is as described.

4. A method for cleaning and removing the surface of a construction object using the injection device according to any one of claims 1 to 3, operating the hand gun to place the nozzle head at the tip of the hand gun near the surface of the construction object, while adjusting the injection direction or injection angle of the injection material from the tip of the hand gun with the direction angle adjustment means to enable the injection material to be injected from the nozzle head toward the surface of the construction object; and then, injecting the injection material from the nozzle head toward the surface of the construction object to clean and remove the surface of the construction object. The cleaning and removing method is characterized by having these steps.

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