KR101937089B1 - Method for rehabilitating superannuated pipes using shot blasting equipment - Google Patents

Abstract

The present invention relates to a method for rehabilitating a pipe by blasting, capable of effectively performing a rehabilitating process by preventing dust used in a process of removing an obsolete film in a pipe and a corroded surface, from being mixed with a shot ball. According to the present invention, an air supply unit (A) supplying air is installed on the front, and an exhaust pipe (B) for exhausting the air is installed on the rear. So, the pipe (P) in which a state of generating air flow at a first flow velocity (V1) in a direction is maintained is rehabilitated by a blaster (200). The method for rehabilitating a pipe includes: a step (S1) of positioning a first round shield (280) having an outer diameter (D2) smaller than an inner diameter (D1) of the pipe (P) in the direction of the air flow and enabling the air flow at the first flow velocity (V1) on the outer side of the first round shield (280) to become fast as the air flow at a second flow velocity (V2) higher than the first flow velocity (V1); and a step (S2) of rotating first and second nozzles (260, 260′) separated from each other around the center of the pipe (P) and injecting the shot ball to the inner circumference of the pipe in an opposite direction of the air flow.

Description

[0001] The present invention relates to a method for rehabilitating superannuated pipes using shot blasting equipment,

The present invention relates to a blast pipe rehabilitation method, and more particularly, to a blast pipe rehabilitation method capable of easily performing a surface treatment on a pipe before a paint process for rehabilitating an old pipe is performed.

Generally, a large pipe such as a water pipe is formed of a cast iron pipe or a steel pipe, and a coating film is formed on the inner circumferential surface of the pipe to prevent the pipe from being corroded by the flowing fluid. The inner pipe is peeled by the change of the temperature and pressure after the pipe is buried. Once the peeling is progressed, the peeling is further promoted by the resistance according to the flow of the fluid. Then, the corrosion due to the oxidation occurs. In addition, after a long period of time, a water layer is formed on the film, resulting in deterioration of water quality.

In order to solve such a problem, there is a method of replacing the entire pipeline. However, since there is a great inconvenience to the passage as well as a lot of construction time while digging the ground and newly filling the land, recently, Has been proposed.

In order to regenerate the pipeline, it is necessary to first remove the old coating and the corrosion surface from the inner circumference of the pipe, and then form a new coating film. In order to achieve this, the blasting equipment is firstly inserted into the pipe, and a plurality of fine balls are sprayed on the inner circumferential surface of the pipe while moving along the pipe, thereby removing the old coating film and the corrosion surface. Recovered and reused to remove coatings and corrosion. Prior art related to this is disclosed in.

However, since the shot ball is fired by compressed air, a large amount of dust is generated in the process of removing the coating film and the corrosion surface, and the shot ball dropped on the floor is mixed with the dust. Therefore, The shot ball required a separate process to separate it, and thus the blasting process took a lot of time. In addition, since the generated dust was very harmful to the operator, it was necessary to operate a separate dust collecting device to collect the dust.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a blast pipe rehabilitation method capable of effectively performing a rehabilitation process by preventing the dust containing dust used in the aging coating and corrosion surface removal process in the pipeline from being mixed with the shot ball The purpose is to provide.

In order to accomplish the above object, according to the present invention, there is provided a method of regenerating a blast pipe, comprising the steps of: providing a supply portion (A) for supplying air to the front and an exhaust port (B) (D1) of the pipe P in the air flow direction in order to regenerate the pipe P in which the air flow of the first flow velocity V1 is maintained in one direction by using the blaster 200, The air flow of the first flow velocity V1 outside the first circular shield 280 is reduced to the first flow velocity V1 by locating the first circular shield 280 having a smaller outer diameter D2 than the first circular shield 280, Gt; S1 < / RTI > to an air flow of a second higher flow velocity V2; (S2) spraying a short ball to the inner circumferential surface of the pipe in the direction opposite to the air flow while rotating the first and second nozzles (260, 260 ') spaced from each other with respect to the center of the pipe (P) ; The blaster (200) includes a base body (210) mounted on a carriage (M) running in the pipeline (P); A swivel joint 220 installed to be rotatable on the front side of the base body 210; A distributor 230 fastened to the swivel joint 220 and having first and second jetting ports 231 and 232 formed symmetrically with respect to the center of the conduit; A shaft 240 extending toward the front side of the distributor 230; First and second supports 250 and 250 'supported in a vertical direction to the shaft 240; The first and second nozzles 260 and 260 'connected to the first and second ejection openings 231 and 232 to eject the shot ball; First and second nozzle coupling ends 270 and 270 'for coupling the first and second nozzles 260 and 260' to the first and second supports 250 and 250 '; The first circular shield 280 supported by the shaft 240 on the front side of the first and second nozzles 260 and 260 '; And the second circular shield 290 supported on the rear base body 210 of the first and second nozzles 260 and 260 '.

In the present invention, the outer diameter D3, which is smaller than the inner diameter D1 of the channel P, is disposed on the opposite side of the first circular shield 280 with respect to the first and second nozzles 260 and 260 ' A step of causing the shot ball ejected from the first and second nozzles 260 and 260 'to fall between the first and second circular shields 280 and 290 by locating the second circular shield 290, (S3).

delete

In the present invention, when the material and size of the shot ball, the flow rate of the airflow, and the like are changed, the injection angle of the first and second nozzle heads 262 and 262 ' (S4) in the opposite direction of the air flow.

In the present invention, the first and second nozzle assembling steps 270 and 270 'include a blade 271 installed at each end of the first and second supports 250 and 250' 271 and 272. The first and second nozzle heads 262 and 262 are rotatably coupled to the first and second nozzle heads 261 and 271 by a hinge shaft H and are rotatable about the hinge axis H. The rotation bracket 272 supports the first and second nozzle heads 262 and 262 ' And an angle fixing part 273 for fixing the rotation angle of the rotation bracket 272 so that the spray angle of the first and second nozzle heads 262 and 262 ' .

In the present invention, the amount of the shot ball ejected regardless of the positions of the first and second nozzle heads 262 and 262 'constituting the first and second nozzles 260 and 260' The ejecting direction of the first nozzle head 262 and the ejecting direction of the second ejecting nozzle 232 are opposite to each other and the ejecting direction of the second nozzle head 262 ' (S5) so that the direction of injection of the fuel is opposite.

According to the present invention, in the blasting process for removing the aged coating film and the corrosive surface while moving inside the pipeline P, dust-containing dust can be prevented from mixing with the shot ball, and the process of separating the dust and the shot ball can be omitted Thus, the pipeline rehabilitation process can be performed quickly.

In addition, since the shot ball mainly falls into the space between the first and second circular shields 280 and 290, the shot ball can be easily recovered, thereby improving the speed of the pipe regeneration process.

The main chamber 233 includes a main chamber 233 and a sub-chamber 234 disposed in the distributor 230. The sub-chamber 234 includes a sub-chamber 234 disposed on the main chamber 233 with respect to an extension line connecting the first and second injection ports 231, Is prevented from moving to the inside of the sub-chamber 234, it is possible to prevent the front end side of the distributor from being broken, and the maintenance time and efforts can be shortened.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram for explaining an entire configuration of a blasting pipe rehabilitation method according to the present invention;
FIG. 2 is a view for explaining that an air supply unit and an air outlet are provided in a duct for regenerating a duct in FIG. 1;
3 is a view for explaining a configuration of a blasting machine inserted into the pipeline of FIG. 2,
4 is a view for explaining the internal configuration of the distributor of FIG. 3,
FIG. 5 is a view for explaining the first and second nozzle fastening stages for fixing the first and second nozzles of FIG.
Fig. 6 is a view for explaining that the first nozzle of Fig. 3 is installed at the second nozzle engagement end and the second nozzle is installed at the first nozzle engagement end,
7 is a view for explaining a configuration of the first and second circular shields shown in Fig. 3;

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessive are intended to mean that a feature, or element, described in the specification is present, and does not preclude the possibility that one or more other features or elements may be added.

In the following embodiments, when a part of a film, an area, a component or the like is on or on another part, not only the case where the part is directly on the other part but also another film, area, And the like.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

If certain embodiments are otherwise feasible, the particular process sequence may be performed differently from the sequence described. For example, two processes that are described in succession may be performed substantially concurrently, and may be performed in the reverse order of the order described.

FIG. 2 is a view for explaining that an air supply unit and an air outlet are installed in a pipeline for regenerating the pipeline of FIG. 1, FIG. 3 is a view for explaining the configuration of the blasting equipment put in the pipeline of FIG. 2, FIG. 3 is a diagram for explaining the internal configuration of the distributor of FIG.

As shown in the drawings, the blast equipment for regenerating a pipe according to the present invention is for recovering the pipe P while moving inside a pipe P such as a water pipe, and is provided with a shot ball tank And a blaster 200 for removing aged coatings and corrosion surfaces on the inner circumferential surface of the pipe using compressed air supplied from a short ball tank 100 and high-pressure compressed air.

Generally, the rehabilitation of the pipeline (P) proceeds sequentially by dividing the pipeline of several tens of kilometers, and is divided into units of lengths of about 1 Km. At this time, a supply portion A for supplying air is provided in front of the regeneration conduit P and an exhaust port B for exhausting air is provided at the rear side to generate an air flow in one direction in the conduit P, Thus, fresh air that can be breathed by the worker working in the pipeline (P) is continuously supplied.

The short ball tank 100 is configured in the form of a double tank of an upper tank and a lower tank, so that the shot ball can be filled and projected. The short ball tank 100 supplies the short ball to the blaster 200 through the short ball hose S1.

3, the blaster 200 is mounted on a carriage M that travels in the pipeline P, and includes a short ball hose S1 for supplying a short ball and an air hose S1 for supplying compressed air. A base body 210 connected to the base body 210; A swivel joint 220 rotatably installed on the front side of the base body 210; A distributor 230 coupled to the swivel joint 220 and having first and second injection ports 231 and 232 formed symmetrically with respect to a center of the pipe; A shaft 240 extending toward the front side of the distributor 230; First and second supports 250 and 250 'supported in a vertical direction to the shaft 240; First and second nozzles 260 and 260 'connected to the first and second ejection openings 231 and 232 of the distributor to eject the short ball S; First and second nozzle coupling ends 270 and 270 'for coupling the first and second nozzles 260 and 260' to the first and second supports 250 and 250 '; The first circular shield 280 having an outer diameter D2 smaller than the inner diameter D1 of the duct P is supported on the front side shaft 240 of the first and second nozzles 260 and 260 ' Wow; A second circular shield (not shown) having an outer diameter D3 smaller than the inner diameter D1 of the pipe P, which is supported by the base body 210 on the rear side of the first and second nozzles 260 and 260 ' 290).

The inner diameter D1 of the conduit P is smaller than the first and second outer diameters D2 and D3 of the first and second circular shields 280 and 290. In this embodiment, ) Has an inner diameter of 2 m. The first and second outer diameters D2 and D3 of the first and second circular shields 280 and 290 are 1.6 m. The outer diameter D2 of the first circular shield 280 and the outer diameter D3 of the second circular shield 290 may be the same but may be different.

The base body 210 is mounted on a carriage C moving in the pipeline P and a first connector 211 for connecting the short ball hose S1 connected to the short ball tank 100 is formed, And a second connector 212 for connecting an air hose S2 connected to a compressor (not shown).

The swivel joint 220 rotatably supports the distributor 230 on the front side of the base body 210 while supplying the short ball S and the air hose S2 via the short ball hose S1 A flow path 221 for guiding the compressed air to the distributor 230 is formed. The swivel joint 220 is rotated by a gear assembly (not shown) installed inside the base body 210.

The distributor 230 is fastened to the swivel joint 220 and rotated with its swivel joint 220. 4, a main chamber 233 for communicating the flow path 221 of the swivel joint with the first and second injection ports 231 and 232, And a sub-chamber 234 biased toward the front side of the main chamber 233 with respect to an extension line connecting the injection ports 231 and 232.

In the main chamber 233, the shot ball S supplied through the flow path 221 and compressed air are mixed and then injected into the first and second injection ports 231 and 232. The sub chamber 234 is connected to the first, It is preferable that the predetermined depth is set to a predetermined depth which is biased toward the front side of the main chamber 233 opposite to the extension line of the second jetting port.

The front end of the sub-chamber 234 is closed and a large pressure is formed compared to the main chamber 233, so that the shot ball S transported by the compressed air is not transported to the inside of the sub-chamber 234 And quickly exits while turning toward the first and second injection ports 231 and 232. Therefore, the short ball S moving at a high speed does not move to the front end of the sub-chamber 234. It is possible to prevent the front end side of the distributor from being damaged.

For reference, the shot ball (S) has enough energy to remove not only the coating on the iron pipe but also the corrosion surface. Accordingly, when the front end wall is formed at the first and second injection ports 231 and 232 without employing the sub-chamber 234, the front end wall is punctured by the impact of the shot ball S within a short time.

The shaft 240 is provided on the front side of the distributor 230 and is provided with first and second supports 270 and 270 for supporting the first and second nozzle fastening ends 270 and 270 ' (250) and (250 ').

The first and second nozzles 260 and 260 'are supported on the first and second supports 250 and 250' and are rotated about the center of the pipe by the rotation of the swivel joint 220. At this time, the rotation speed of the first and second nozzles 260 and 260 'may vary depending on the size and the number of channels, but it is preferably about 60 rpm.

FIG. 5 is a view for explaining the first and second nozzle fastening stages for fixing the first and second nozzles of FIG. 3 in an angle-changeable manner, and FIG. 6 is a cross- And the second nozzle is installed at the first nozzle engagement end.

The first nozzle 260 includes a first nozzle 261 connected to the first injection port 231 and a first nozzle head 262 installed at an end of the first hose 261, The second nozzle 260 'includes a second nozzle 261' connected to the second injection port 232 and a second nozzle head 262 'installed at the end of the second hose 261'.

The first and second nozzle fastening ends 270 and 270 'support the first and second nozzles 260 and 260' to the first and second supports 250 and 250 ' The fastening ends 270 and 270 'are formed at the injection angle of the first and second nozzle heads 262 and 262' constituting the first and second nozzles 260 and 260 ' The injection angle of the ball is directed to the opposite side of the air flow direction, and the injection angle can be varied as required.

6, the first and second nozzle fastening ends 270 and 270 'may include a blade 271 installed at each end of the first and second supports 250 and 250' A rotating bracket 272 coupled to the blade 271 so as to rotate about the hinge axis H and supporting the first and second nozzle heads 262 and 262 ' And an angle fixing portion 273 for fixing the rotation angle of the rotation bracket 272 so that the spray angle of the first and second nozzle heads 262 and 262 'is opposite to the air flow direction.

For example, the angle fixing portion 273 may be formed in various ways. For example, the angle fixing portion 273 may include a circumferential guide groove 273a formed in the wing 271 with the same radius at the hinge axis H and an edge of the circumferential guide groove 273a And a fixing bolt 273c penetrating the circumferential guide groove 273a and fastened to the pivot bracket 272. [ As a result, the angle of rotation of the first and second nozzles 262 and 262 'can also be varied in the direction opposite to the airflow, because the rotation angle of the rotation bracket 272 can be varied by the angle fixing portion 273. [ .

By these first and second nozzle fastening ends 270 and 270 '. The injection angle of the shot ball injected by the compressed air can be varied corresponding to the parameters such as the material and size of the shot ball to be used or the flow rate of the air flow by the air discharge apertures A and B, Rehabilitation work can be performed effectively. For example, when the particle diameter of the shot ball is large, the angle fixing portion 273 is inclined at a large spray angle with the first and second nozzle heads 262 and 262 ' And when the size of the shot ball is small, the jetting angle of the first and second nozzle heads 262 and 262 'is reduced with respect to the vertical direction of the pipe.

7, the first nozzle head 262 is installed at the second nozzle fastening end 270 ', and the second nozzle head 262' is installed at the first nozzle fastening end 270 . In this case, even if the positions of the first and second ejection openings 231 and 232 are in the gravity direction or in the opposite gravity direction, the shot ball having its own weight can be uniformly sprayed by the rotation of the distributor 230.

As described above, the short ball has a property of falling in the direction of gravity by having its own weight. 3, the gravity direction position of the first jetting port 231 and the first nozzle head 262 are the same, and the gravity direction position of the second jetting port 232 and the second nozzle head 262 ' The amount of the shot balls ejected according to the positions of the first and second nozzle heads 262 and 262 'due to the rotation of the distributor 230 becomes uneven, A certain quality may not be obtained.

However, in the present invention, the first nozzle head 262 is installed at the second nozzle coupling end 270 'and the second nozzle head 262' is installed at the first nozzle coupling end 270, The ejecting direction of the first nozzle head 262 and the ejecting direction of the second ejecting opening 232 are opposite to each other with respect to the center (shaft 240) of the second nozzle head 262 ' The injection direction of the one injection hole 231 is reversed so that the shot ball having its own weight can be sprayed relatively evenly. Accordingly, the amount of the shot balls ejected to the first and second nozzle heads 262 and 262 'becomes constant irrespective of the position of the first and second nozzle heads, so that the aged coating and the corrosion surface can be removed with a constant quality .

The first circular shield 280 is supported on the front shaft 240 of the first and second nozzles 260 and 260 'and has an outer diameter D2 smaller than the inner diameter D1 of the duct P .

The second circular shield 290 is supported by the base body 210 on the rear side of the first and second nozzles 260 and 260 'and has an outer diameter D3 smaller than the inner diameter D1 of the duct P ). The second circular shield 290 is supported on the base body 210 to prevent the load of the second circular shield 290 from being applied to the rotating shaft 240, thereby facilitating long-time driving.

The first circular shield 280 may be configured such that the air of the first flow velocity V1 generated by the air supply ports A and B is supplied to the first circular shield 280 outside the first circular shield 280, 2 Accelerate with air at the flow velocity (V2). Dust containing dust generated in the process of removing the aged coating and the corrosion surface of the shot ball S is quickly exhausted toward the front side of the first circular shield 280 through the outside of the first circular shield 280, So that the heavy short ball S protrudes to the rear side of the first circular shield 280. As a result, the shot ball and the dust are separated from each other naturally, and the shot ball need not be separately air-cleaned.

The second circular shield 290 forms a space between the first circular shields 290 so that the shot ball ejected from the first and second nozzles 260 and 260 ' So that the shot ball S can be easily recovered.

The flow of air passing through the outside of the second circular shield 290 is accelerated to generate a swirling flow between the first and second circular shields 280 and 290. By this swirling flow, The effect can be enhanced and the dust can be effectively separated, and the separated dust escapes through the outside of the first circular shield 280.

FIG. 7 is a view for explaining the configuration of the first and second circular shields shown in FIG. 3. FIG.

The first circular shield 280 has an outer diameter D2 smaller than the inner diameter D1 of the duct P and includes a first inner shield 281 fixed to the shaft 240, And a first outer shield 282 made of a flexible material and provided on an outer circumferential surface of the first outer shield 281. The first circular shield 280 narrows the space between the pipelines P and induces the venturi effect to accelerate the flow of air escaping between the first circular shield 280 and the duct P. That is, the air flow of the first flow velocity V1 flowing through the duct P is made to be the air flow of the second flow velocity V2 faster than the first flow velocity V1 outside the first circular shield 280 .

The second circular shield 290 has an outer diameter D3 smaller than the inner diameter D1 of the duct P and includes a second inner shield 291 fixed to the base body 210, And a second outer shield 292 made of a flexible material and provided on the outer circumferential surface of the shield 291. The first circular shield 290 forms a space separated from the first circular shield 280 with the first and second nozzles 260 and 260 'therebetween, The flow of air escaping between the second circular shield 290 and the duct P is accelerated and a strong whirl phenomenon occurs between the first circular shield 280 and the first circular shield 280. [ Accordingly, by separating the shot ball from the dust generated in the process of removing the old paint film and the corrosion surface, and further dropping the dropping space of the shot ball that protrudes after colliding with the inner circumferential surface of the pipe P, Thereby facilitating recovery.

The outer diameter D2 of the first circular shield 280 and the outer diameter D3 of the second circular shield 290 may be the same but may be different.

The first and second inner shields 281 and 291 are circular in shape and the first and second outer shields 182 and 292 are formed in a ring shape The first and second outer shields 282 and 292 are made of a flexible material. Accordingly, the diameter of the first and second circular shields 280 and 290 may be changed when a pressure is externally applied for some reason.

A pipe (P) such as a water pipe is buried for more than several decades. If a geologic change occurs or a vehicle of a heavy weight travels to the upper side of the pipe (P), the diameter of the pipe (P) may be changed. For example, a pipe with a diameter of 2 m may have an inner diameter of 1,7 m in some sections after several decades. In this case, the first and second outer shields 282 and 292 can be deformed, and as a result, the outer diameters D2 and D3 of the first and second circular shields 280 and 290 can be varied, It is possible to pass through the duct of the inner diameter.

Next, a method for regenerating the brassing pipe according to the present invention will be described.

1 is a block diagram for explaining an overall configuration of a blast pipe rehabilitation method according to the present invention.

A supply portion A for supplying air is provided in front of the pipeline P and an exhaust port B for exhausting air is provided at the rear side of the pipeline P so that the air of the first flow velocity V1 The state in which the flow is generated is maintained.

The first circular shield 280 having an outer diameter D2 smaller than the inner diameter D1 of the duct P in the air flow direction is moved for regenerating the duct P, (S1) of generating an air flow of a second flow velocity (V2) which is faster than the first flow velocity (V1) of the air flow outside. That is, the step S1 is a step of increasing the flow of air outside the first circular shield 280, and the air of the first flow velocity V1 generated by the air supply / discharge ports A, To the air of the second flow velocity V2 which is larger than the first flow velocity V1 from the outside of the first flow passage 280.

Next, the first and second nozzles 260 and 260 'spaced apart from each other with respect to the center of the pipe are rotated, and the step S2 of spraying the shot ball to the inner circumferential surface of the pipe in the direction opposite to the air flow is performed. At this time, since the spray direction of the shot ball is opposite to the air flow direction in step S1, the dust generated in the process of removing the aged coating and the corrosion surface due to the shot ball is discharged by the air flow having the second flow velocity V2 1 circular shield 280 and the shot ball is dropped from the rear side of the first circular shield 280. [ That is, the dust generated in the process of removing the old coating film and the corrosion surface is not mixed with the shot ball, but flows toward the exhaust port B side.

Next, a second circular shield (not shown) having an outer diameter D3 smaller than the inner diameter D1 of the duct P on the opposite side of the first circular shield 280, around the first and second nozzles 260 and 260 ' 290 so that the shot ball ejected from the first and second nozzles 260, 260 'is dropped between the first and second circular shields 280, 290. Namely, step S3 is a step (S3) of placing the second circular shield on the rear side of the first circular shield so that the shot ball falls between the first circular shield and the second circular shield. Through this step S3, the falling space of the shot ball is removed, thereby facilitating the recovery of the shot ball.

The flow of air passing through the outside of the second circular shield 290 is accelerated to generate a swirling flow between the first and second circular shields 280 and 290. By this swirling flow, The effect is enhanced and the dust can be effectively separated. The dust thus separated passes through the outside of the first circular shield 280.

Next, when the material and size of the shot ball used for pipe line regeneration, or the flow rate of the airflow by the air supply ports (A) and (B), the first and second nozzle heads (S4) varying the spraying angle of each of the spray nozzles 262 and 262 '.

As described above, according to the present invention, in the blasting process for removing the aged coating film and the corrosive surface while moving inside the pipeline P, the process of separating the dust and the shot ball by preventing the shot ball from being mixed with the generated dust is omitted And thus, the pipe rehabilitation process can be rapidly performed.

On the other hand, in order to make the amount of the shot ball sprayed constant regardless of the positions of the first and second nozzle heads 262 and 262 'constituting the first and second nozzles 260 and 260' As you can see. The ejecting direction of the first nozzle head 262 and the ejecting direction of the second ejecting opening 232 are opposite to each other and the ejecting direction of the second nozzle head 262 ' (S5). ≪ / RTI >

As described above, according to the present invention, in the blasting process for removing the aged coating film and the corrosive surface while moving inside the pipeline P, the dust-containing dust is prevented from being mixed with the shot ball and the process of separating the dust and the shot ball is omitted And thus, the pipe rehabilitation process can be rapidly performed.

In addition, since the shot ball mainly falls into the space between the first and second circular shields 280 and 290, the shot ball can be easily recovered, thereby improving the speed of the pipe regeneration process.

The main chamber 233 includes a main chamber 233 and a sub-chamber 234 disposed in the distributor 230. The sub-chamber 234 includes a sub-chamber 234 disposed on the main chamber 233 with respect to an extension line connecting the first and second injection ports 231, Is prevented from moving to the inside of the sub-chamber 234, it is possible to prevent the front end side of the distributor from being broken, and the maintenance time and efforts can be shortened.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

100 ... short ball tank 200 ... blaster
210 ... base body 220 ... swivel joint
221 ... Euro 230 ... Distributor
231, 232 ... First and second ejection holes 233 ... Main chamber
234 ... sub-chamber 240 ... shaft
250, 250 '... first and second supports 260, 260' ... first and second nozzles
261, 261 '... first and second hoses 262, 262' ... first and second nozzle heads
270, 270 '... first and second nozzle fastening ends 271 ... wing
272 ... rotation bracket 273, ..., angle fixing portion
273a ... circumferential guide groove 273b ... friction
273c ... fixing bolt 280 ... first circular shield
281 ... first inner shield 282 ... first outer shield
290 ... second circular shield 291 ... second inner shield
292 ... second outer shield

Claims (6)

Since the air supply portion A for supplying air to the front is provided and the air outlet B for exhausting air is provided on the rear side, the state where the air flow of the first flow velocity V1 is generated in one direction is maintained In order to regenerate the channel P by using the blaster 200,
The first circular shield 280 having an outer diameter D2 smaller than the inner diameter D1 of the pipe P in the air flow direction is disposed outside the first circular shield 280, (S1) of advancing the air flow of the flow velocity V1 to the air flow of the second flow velocity V2 which is larger than the first flow velocity V1 thereof; And
(S2) spraying the shot ball to the inner circumferential surface of the pipe in the direction opposite to the air flow while rotating the first and second nozzles (260, 260 ') spaced from each other with respect to the center of the pipe (P)
The blaster (200) includes a base body (210) mounted on a carriage (M) running in the pipeline (P); A swivel joint 220 installed to be rotatable on the front side of the base body 210; A distributor 230 fastened to the swivel joint 220 and having first and second jetting ports 231 and 232 formed symmetrically with respect to the center of the conduit; A shaft 240 extending toward the front side of the distributor 230; First and second supports 250 and 250 'supported in a vertical direction to the shaft 240; The first and second nozzles 260 and 260 'connected to the first and second ejection openings 231 and 232 to eject the shot ball; First and second nozzle coupling ends 270 and 270 'for coupling the first and second nozzles 260 and 260' to the first and second supports 250 and 250 '; The first circular shield 280 supported by the shaft 240 on the front side of the first and second nozzles 260 and 260 '; And a second circular shield (290) supported on the rear base body (210) of the first and second nozzles (260) and (260 '). The method according to claim 1,
A second circular shield having an outer diameter D3 smaller than the inner diameter D1 of the duct P on the opposite side of the first circular shield 280 with respect to the first and second nozzles 260 and 260 ' (S3) of causing a shot ball ejected from the first and second nozzles 260 and 260 'to fall between the first and second circular shields 280 and 290 by locating the first and second circular shields 290 and 290' Wherein the blasting pipeline includes a plurality of blasting pipelines. delete The method according to claim 1,
When the material or size of the shot ball or the flow rate of the air flow is changed, the injection angle of the first and second nozzle heads 262 and 262 ', which constitute the first and second nozzles, Further comprising the step of: (S4) varying the direction of the blast pipe. 5. The apparatus of claim 4, wherein the first and second nozzle fastening ends (270, 270 '
A wing 271 provided at each end of the first and second supports 250 and 250 'and a second wing 272 coupled to the wing 271 so as to rotate about a hinge axis H, A rotation bracket 272 for supporting the heads 262 and 262 'and a rotation angle sensor 260 installed between the wing 271 and the rotation bracket 272 to detect an angle of ejection of the first and second nozzle heads 262 and 262' And an angle fixing part (273) for fixing the rotation angle of the rotation bracket (272) so that the rotation angle of the rotation bracket (272) is opposite to the direction of the air flow. 5. The method of claim 4,
In order to make the amount of the shot balls injected uniform regardless of the positions of the first and second nozzle heads 262 and 262 'constituting the first and second nozzles 260 and 260'
The ejecting direction of the first nozzle head 262 and the ejecting direction of the second ejecting opening 232 are opposite to each other and the ejecting direction of the second nozzle head 262 ' (S5) to the opposite side of the blast pipe.

Images