JP2010078539A - Cutting method of structure member, and structure member cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method of a structure member capable of improving a recovery efficiency of a granular waste. <P>SOLUTION: A core shroud 30 to be cut is arranged in the water 29 between a nozzle 4 of a cutting device 2 and a recovery container 9. An annular projection part 10 projecting to the inside is formed on an open end of the recovery container 9. A cutting assistant from a cutting assistant supply device 7 is mixed into a high pressure water pressurized by a high pressure pump 5, in a mixing part 3 of the cutting device 2. The high pressure water containing the cutting assistant is jetted out as abrasive water jet 26 from the nozzle 4 toward the core shroud 30. The abrasive water jet 26 collides with the core shroud 30 to cut the core shroud 30. A high pressure water flow 27 of the abrasive water jet 26 passing the core shroud 30 and flowing into the recovery container 9 flows toward a sidewall on a bottom part of the recovery container 9, further flows along the sidewall, and hits on the projection part 10, to thereby form a flow toward the inside of the recovery container 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structural member cutting method and a structural member cutting apparatus, and more particularly, to a cutting method for cutting a structural member used in a nuclear power plant by a water jet containing a cutting aid (hereinafter referred to as an abrasive water jet). The present invention relates to a structural member cutting method and a structural member cutting apparatus suitable for application.

  Cutting of structural members using an abrasive water jet has been proposed. When the structural member to be cut is a large structural member such as concrete, stone, or steel material, the cutting of the structural member with a high-pressure abrasive water jet is performed in an air environment. When the structural member to be cut is small, the object is placed near the water surface of the water tank having a shallow water depth, and a high-pressure abrasive water jet is jetted downward toward the structural member to be cut. An example of a cutting device using an abrasive water jet is described in Japanese Patent Application Laid-Open No. 62-90493.

  The cutting method using an abrasive water jet is also applied to the cutting of structural members of a nuclear power plant. An example of cutting a structural member of a nuclear power plant with an abrasive water jet is described in JP-A-2006-343250 and JP-A-2007-24586.

  Japanese Patent Application Laid-Open No. 2006-343250 describes a method of cutting a core shroud in a reactor pressure vessel with a lid removed. The nozzle and the collection vessel are arranged such that a core shroud exists between them. An abrasive water jet is jetted from the nozzle toward the core shroud, and used cutting aid (aluminum oxide) and core shroud fragments (cutting chips) generated by grinding the core shroud are collected in a collection container. A hose connected to a suction pump is connected to the bottom of the recovery container, and water, used cutting aid, and crushed pieces in the recovery container are sucked by driving the suction pump.

  Japanese Patent Laid-Open No. 2007-24586 describes that a nozzle and a recovery container are installed in a dryer / separator pool of a nuclear power plant, and structural members of the nuclear power plant are cut in the dryer / separator pool by an abrasive water jet injected from the nozzle. is doing.

JP-A-62-90493 JP 2006-343250 A JP 2007-24586 A

  When the structural member of the nuclear power plant is cut by the abrasive water jet, the used cutting aid and the crushed pieces of the structural member are collected in the collection container and sucked from the collection container by the pump. Used cutting aids and crushed pieces are granular waste. Since the recovered granular waste is accompanied by the high-pressure water flow jetted from the nozzle, the flow rate of the granular waste into the recovery container is fast, and the kinetic energy of the granular waste is increased. For this reason, even if the granular waste flows into the recovery container, the granular waste flows out of the recovery container before being sucked by the pump, and the recovery efficiency of the granular waste is lowered. It has also been pointed out in paragraph 0018 of Japanese Patent Application Laid-Open No. 2006-343250 that particulate waste leaks from the collection container when the structural member is cut. For this reason, improvement of the collection | recovery efficiency of the granular waste produced | generated by the cutting | disconnection of the structural member using an abrasive water jet is desired.

  The objective of this invention is providing the cutting method and structural member cutting device of a structural member which can improve the collection | recovery efficiency of a granular waste.

A feature of the present invention that achieves the above-described object is that the structural member to be cut is disposed between the open end of the collection container and the nozzle in which an annular protrusion that protrudes inward is formed at the open end. And
Cutting the structural member by ejecting a pressurized liquid containing a cutting aid from the nozzle toward the structural member;
The flow of the liquid containing the cutting particles of the structural member generated by cutting and the cutting aid that has passed through the cutting portion of the structural member is caused to flow into the collection container,
The object is to suck a liquid containing a cutting piece and a cutting aid from the collection container.

  The flow of the liquid containing the cutting particles of the structural member generated by cutting and the cutting aid, which has passed through the cutting point of the structural member, is disposed in a collection container in which an annular protrusion protruding inward is formed at the open end. When the liquid flows in, this liquid flow strikes the protrusion and changes the flow direction inward. For this reason, the amount of cutting particles and cutting aid flowing out from the open end of the collecting container is reduced, and the collection efficiency of cutting particles and cutting aid is improved.

  According to the present invention, it is possible to improve the recovery efficiency of granular waste generated by cutting structural members.

  Examples of the present invention will be described below.

  A method for cutting a structural member according to embodiment 1 which is a preferred embodiment of the present invention will be described with reference to FIGS.

  A structural member cutting apparatus 1 used in the cutting method of this embodiment will be described first with reference to FIGS. The structural member cutting device 1 includes a cutting device 2, a high-pressure pump 5, a cutting aid supply device 7, a collection container 9, and a waste collection / purification device 12. The cutting device 2 includes a mixing unit 3 and a nozzle 4. The nozzle 4 is provided in the mixing unit 3. The mixing unit 3 is connected to the high pressure pump 5 by a high pressure hose 6 and is connected to a cutting aid supply device 7 by a cutting aid supply hose 8. As shown in FIG. 2, the collection container 9 has an annular protrusion 10 protruding inward at an open end. The protrusion 10 is formed over the entire circumference of the open end in the circumferential direction of the collection container 9. A recovery hose 11 connected to the bottom of the recovery container 9 is connected to a waste recovery / purification device 12.

  The waste recovery / purification device 12 includes a housing 13, a steam / water separator 14, spoil cans 15 and 18, a recovery pump 16, a cyclone separator 17, and a filter 19. The steam separator 14, the recovery pump 16, the cyclone separator 17 and the filter 19 are connected in series in this order. The spoil can 15 is connected to the bottom of the steam separator 14, and the spoil can 18 is connected to the bottom of the cyclone separator 17. A steam / water separator 14, spoil cans 15 and 18, a recovery pump 16, a cyclone separator 17 and a filter 19 are installed in the housing 13. The recovery hose 11 is connected to the steam / water separator 14.

  The structural member cutting method according to the present embodiment will be described with reference to an example of cutting a core shroud that is a structural member of a boiling water nuclear power plant that is a nuclear power plant.

  The core shroud is installed in a reactor pressure vessel of a boiling water nuclear power plant, and surrounds a core disposed in the reactor pressure vessel. A shroud replacement operation for replacing the deteriorated core shroud with a new core shroud is performed after the operation of the boiling water nuclear power plant is stopped. In this shroud replacement work, after the boiling water nuclear power plant is shut down, the reactor pressure vessel lid is removed and the steam dryer, steam separator, and reactor core installed in the reactor pressure vessel are loaded. The plurality of fuel assemblies and the like thus taken out from the reactor pressure vessel. The extracted steam dryer and steam separator are stored in a temporary storage pool in the reactor building, and the fuel assembly is stored in a fuel storage pool.

  In carrying out the structural member cutting method of the present embodiment, the waste collection / purification device 12 of the structural member cutting device 1 is installed in an equipment temporary storage pool filled with water 29 (see FIG. 1). The high-pressure pump 5 exists in the reactor building and is installed on the operation floor 31 (or another area) in which the equipment temporary storage pool and the fuel storage pool are formed. The cutting device 2 is disposed in the water 29 in the equipment temporary storage pool. The cutting device 2 is attached to the lower end portion of the mast 25. In a boiling water nuclear power plant, a cutting carriage 21 is movably installed on a rail 24 provided on an operation floor 31. The cutting carriage 21 has a traveling carriage 22 that moves on the rail 24 and a traversing carriage 23 provided on the traveling carriage 22. The traversing carriage 23 moves on the traveling carriage 22 in a direction perpendicular to the rails 24. The traveling carriage 22 is arranged so as to straddle the equipment temporary storage pool. The mast 25 is attached to the traversing cart 23, and the cutting aid supply device 7 is also installed on the traversing cart 23.

  Primary cutting of the core shroud is performed in the reactor pressure vessel. The core shroud is cut circumferentially at a certain height. The cut cylindrical core shroud 30 is conveyed to the equipment temporary storage pool. As shown in FIG. 8 of Japanese Patent Application Laid-Open No. 2006-343250, the core shroud 30 to be cut is fixed on a pedestal installed at the bottom of the equipment temporary storage pool. The traveling carriage 22 and the traversing carriage 23 are moved so that the nozzle 4 of the cutting device 2 is adjusted to face the cutting position of the core shroud 30. The collection container 9 is arranged so that the open end portion faces the cut portion of the core shroud 30. The cut portion of the core shroud 30 is located between the nozzle 4 and the collection container 9.

  By driving the high-pressure pump 5, the structural member cutting method of the present embodiment is executed. The high-pressure water boosted by the high-pressure pump 5 is supplied to the mixing unit 3 of the cutting device 2 through the high-pressure hose 6. The cutting aid discharged from the cutting aid supply device 7 is supplied to the mixing unit 3 through the cutting aid supply hose 8 and mixed with high-pressure water. High-pressure water containing a cutting aid is jetted from the nozzle 4 toward the core shroud 30. Reference numeral 26 denotes a jet flow of high-pressure water containing a cutting aid jetted from the nozzle 4, that is, an abrasive water jet. A portion of the core shroud 30 where the abrasive water jet 26 collides is cut. The core shroud 30 is cut in the height direction by moving the mast 25 in the height direction while ejecting the abrasive water jet 26 from the nozzle 4.

  When the abrasive water jet 26 collides with the core shroud 30, the core shroud 30 is cut to generate cutting waste, and the cutting aid is also pulverized to reduce the particle size. Most of the cutting waste and the cutting aid having a reduced particle size are flowed to the back side of the core shroud 30 along with the abrasive water jet 26. The high-pressure water stream 27 containing the cutting waste and the cutting aid having a reduced particle size reaches the inside of the recovery container 9.

  Since the recovery pump 16 is driven, the water in the recovery container 9 containing the cutting waste that is granular waste and the cutting aid having a finer particle diameter is sucked from the bottom of the recovery container 9 and is put into the recovery hose 11. Inflow. Water containing these granular wastes is guided to the steam separator 14. The steam separator 14 separates the gas and water sucked simultaneously with the granular waste. The separated gas is discharged from the steam / water separator 14 into the water 29 in the equipment temporary storage pool. The steam-water separation device 14 separates solid content such as cutting waste having a large particle size, which is contained in the inflowing water. The separated solid content falls into the spoil can 15 and is stored in the spoil can 15. The water discharged from the steam separator 14 is guided into the cyclone separator 17 through the recovery pump 16. The cyclone separator 17 separates a medium-sized solid content, which is granular waste, contained in the inflowing water. The separated solid content is stored in the spoil can 18. The water discharged from the cyclone separator 17 is supplied to the filter 19. The filter 19 removes the remaining granular waste having a small particle size. The water from which the granular waste has been removed is discharged from the outlet 20 of the filter 19 into the water 29 in the equipment temporary storage pool.

  When cutting the core shroud 30 in the horizontal direction, the cutting device 2 is moved in the horizontal direction by moving the traveling carriage 22 and the traveling carriage 23. The cutting of the core shroud 30 using the abrasive water jet 26 injected from the nozzle 4 is a secondary cutting operation for further finely cutting the core shroud 30 that has been primarily cut.

  In the method for cutting the structural member of this embodiment, the high-pressure water stream 27 (abrasive water jet 26) that has flowed into the recovery container 9 hits the bottom of the recovery container 9 and reverses as shown in FIG. Flows toward the protrusion 10 of the collection container 9 along the inner surface of the recovery container 9. The high-pressure water stream 27 that reaches the open end of the recovery container 9 along the inner surface of the side wall of the recovery container 9 collides with the protrusion 10 and is bent inward. Since the granular waste also flows by this flow, the residence time of the granular waste in the recovery container 9 becomes longer, and the amount of the granular waste that is sucked by the recovery pump 16 and recovered by the waste recovery / purification device 12 Will increase. For this reason, it is possible to reduce the amount of granular waste that leaks to the outside of the recovery container 9 from the gap formed between the open end of the recovery container 9 and the core shroud 30, that is, the cutting waste and the cutting aid. . By using the recovery container 9 in which the protruding portion 10 that protrudes inwardly is formed at the open end, it is possible to improve the recovery efficiency of the granular waste generated when the core shroud 30 is cut by the abrasive water jet 26.

  According to this embodiment, since the protruding portion 10 protruding inwardly at the open end is formed at the open end and the recovery container 9 connected to the recovery hose 11 is used, from the open end to the outside of the recovery container 9 The amount of granular waste that leaks into the container is reduced, and the recovery efficiency of the granular waste is improved. Although the recovery container 9 is washed to remove the radioactive substance attached to the recovery container 9 after the end of the cutting, the structure of the recovery container 9 is simple, so that the cleaning efficiency for removing the radioactive substance from the recovery container 9 is increased. . Moreover, since the structure of the collection container 9 is simple, the manufacture can be performed more easily than the collection containers 9B, 9C, 9D, and 9E described later.

  The structural member cutting apparatus 1 according to the present embodiment includes a structural member other than the core shroud 30 of the boiling water nuclear power plant, for example, piping such as an in-core measurement guide tube and a core spray piping, an upper lattice plate, a core support plate, It can be used for cutting a jet pump or the like. The structural member cutting device 1 can also be applied to the cutting of a structural member of a pressurized water reactor.

  A method for cutting a structural member according to embodiment 2, which is another embodiment of the present invention, will be described with reference to FIG. The structural member cutting apparatus 1A used in the structural member cutting method of the present embodiment has a structure in which the recovery container 9 in the structural member cutting apparatus 1 used in the first embodiment is replaced with a recovery container 9A shown in FIG. The other structure of the structural member cutting device 1A is the same as that of the structural member cutting device 1.

  The recovery container 9A has a bent part (extending toward the bottom of the recovery container 9A in the axial direction of the recovery container 9A, in addition to the tip of the projecting portion 10 protruding inwardly formed at the open end of the recovery container 9. The barb portion 32 is formed. The protrusion 10 and the bent portion 32 are formed by bending the open end of the collection container 9A twice. The protruding portion 10 and the bent portion 32 are formed over the entire circumference in the circumferential direction of the collection container 9A at the open end portion.

  The core shroud 30 is cut by ejecting the abrasive water jet 26 from the nozzle 4 and causing it to collide with the core shroud 30. The high-pressure water stream 27 of the abrasive water jet 26 that has reached the back side of the core shroud 30 flows into the recovery container 9A. A part of the high-pressure water flow 27 hits the bottom of the recovery container 9 </ b> A, reverses and flows toward the protrusion 10 along the inner surface of the side wall of the recovery container 9. The high-pressure water stream 27 that flows along the inner surface of the side wall of the recovery container 9A and collides with the protrusion 10 is bent inward and further hits the bent part 32 and is bent again toward the bottom of the recovery container 9A. For this reason, the amount of the granular waste toward the bottom of the recovery container 9A increases along with the high-pressure water flow 27 which is accompanied by the high-pressure water flow 27 and the flow is bent at the protrusion 10 and the bent portion 32, and is supplied to the recovery pump 16. The amount of granular waste that is sucked and collected by the waste collection / purification device 12 increases. Therefore, the amount of granular waste that leaks out from the open end of the collection container 9A is reduced.

  In the present embodiment, since the bent portion 32 extending toward the bottom is formed in the recovery container 9A, the amount of granular waste leaking from the open end of the recovery container can be reduced as compared with the first embodiment. For this reason, the recovery efficiency of the granular waste in a present Example improves rather than Example 1. FIG. The collection container 9A used in the present embodiment has a more complicated structure than the collection container 9 because the bent portion 32 exists, but the structure is simpler than the collection containers 9B, 9C, 9D, and 9E described later. As a result, manufacturing is easier and cleaning efficiency is higher than these collection containers.

  A method for cutting a structural member according to embodiment 3, which is another embodiment of the present invention, will be described with reference to FIG. The structural member cutting apparatus 1B used in the structural member cutting method of the present embodiment has a structure in which the recovery container 9 in the structural member cutting apparatus 1 used in the first embodiment is replaced with a recovery container 9B shown in FIG. The other structure of the structural member cutting device 1B is the same as that of the structural member cutting device 1.

  The collection container 9B is provided with a plurality of protrusions 33 on the bottom surface and a plurality of protrusions 34 on the inner surface of the side wall. Each protrusion 33 provided on the bottom surface is plate-shaped and extends in the axial direction of the collection container 9B. Each protrusion 34 provided on the inner surface of the side wall has an annular shape and extends toward the central axis of the collection container 9B. These protrusions 33 and 34 function as a flow velocity suppressing device that slows the flow velocity of the high-pressure water flow 27.

  The core shroud 30 is cut by ejecting the abrasive water jet 26 from the nozzle 4 and causing it to collide with the core shroud 30. The high-pressure water stream 27 that is the abrasive water jet 26 that has reached the back side of the core shroud 30 flows into the recovery container 9B. A part of the high-pressure water flow 27 hits the bottom of the recovery container 9B and is reversed and flows toward the open end along the inner surface of the side wall of the recovery container 9B. However, the high-pressure water flow 27 that is reversed collides with the protrusions 33 and the protrusions 34 to attenuate the kinetic energy, thereby reducing the flow velocity. For this reason, the granular waste accompanying the high-pressure water stream 27 is easily sucked by the recovery pump 16, and the amount of granular waste recovered by the waste recovery / purification device 12 increases.

  In this embodiment, the amount of granular waste that leaks to the outside from the open end of the recovery container 9B is reduced, and the recovery efficiency of the granular waste is improved.

  The cutting method of the structural member of Example 4 which is another Example of this invention is demonstrated using FIG. The structural member cutting apparatus 1C used in the structural member cutting method of the present embodiment has a structure in which the recovery container 9 in the structural member cutting apparatus 1 used in the first embodiment is replaced with a recovery container 9C shown in FIG. The other structure of the structural member cutting device 1C is the same as that of the structural member cutting device 1.

  The collection container 9C has a configuration in which the projections 33 and 34 of the collection container 9B are replaced with projections 33A and 34A, and the projections 33A and 34A decrease in thickness toward the tip. The protrusions 33A and 34A are also flow rate suppression devices, similar to the protrusions 33 and 34. In the present embodiment, the effects produced in the third embodiment can be obtained.

  A method for cutting a structural member according to embodiment 5 which is another embodiment of the present invention will be described with reference to FIGS. The structural member cutting apparatus 1D used in the structural member cutting method of the present embodiment has a structure in which the recovery container 9 in the structural member cutting apparatus 1 used in the first embodiment is replaced with a recovery container 9D shown in FIG. The other structure of the structural member cutting device 1D is the same as that of the structural member cutting device 1.

  The collection container 9D has a plurality of discharge ports 35 on the bottom surface and a plurality of discharge ports 36 near the bottom surface of the side wall. The recovery hose 11 is connected to each outlet 35 and each outlet 36.

  The core shroud 30 is cut by ejecting the abrasive water jet 26 from the nozzle 4 and causing it to collide with the core shroud 30. The high-pressure water stream 27 that is the abrasive water jet 26 that has reached the back side of the core shroud 30 flows into the recovery container 9D. The high-pressure water stream 27 that has flowed into the recovery container 9D is sucked by the recovery pump 16 from the discharge ports 35 formed on the bottom surface of the recovery container 9D and the discharge ports 36 formed on the side walls. To be recovered. The particulate waste that has flowed into the collection container 9D is also collected by the waste collection / purification device 12 along with the high-pressure water stream 27.

  In the present embodiment, since a plurality of discharge ports are formed on the bottom surface and the side wall of the recovery container 9D, the high-pressure water stream 27 that has reached the bottom of the recovery container 9D easily flows into the recovery hose 11. For this reason, the amount of the granular waste accompanying the high-pressure water stream 27 is also sucked into the discharge ports 35 and 36 at the bottom of the recovery container 9D. The amount of granular waste that is reversed by hitting the side wall of the recovery container 9D at the bottom, and the amount of each of the high-pressure water stream 27 and granular waste toward the open end of the recovery container 9D decreases and leaks from the open end of the recovery container 9D Decrease. This example also improves the collection efficiency of the granular waste.

  The cutting method of the structural member of Example 6 which is another Example of this invention is demonstrated using FIG. The structural member cutting device 1E used in the structural member cutting method of the present embodiment has a structure in which the recovery container 9 in the structural member cutting device 1 used in the first embodiment is replaced with a recovery container 9E shown in FIG. Furthermore, it has the control apparatus 40, the position sensor 44, and the angle sensor 45. FIG. The other structure of the structural member cutting device 1E is the same as that of the structural member cutting device 1.

  The collection container 9E has a structure in which a plurality of opening / closing plates 37 are provided in the collection container 9D. Each open / close plate 37 is provided corresponding to each discharge port 35, 36, and is attached to the inner surface of the collection container 9E so as to be openable and closable. Each opening / closing plate 37 normally covers the corresponding discharge ports 35 and 36 to seal the discharge ports. An opening / closing device 43 that opens and closes the opening / closing plate 37 is provided for each opening / closing plate 37 and installed on the inner surface of the collection container 9E. A position sensor 44 is installed on the traversing carriage 22 of the cutting carriage 21, and an angle sensor 45 is installed on the mast 25. The angle sensor 45 may be installed on the traversing carriage 22 in the same manner as the position sensor 44.

  The core shroud 30 is cut by ejecting the abrasive water jet 26 from the nozzle 4 and causing it to collide with the core shroud 30. The high-pressure water stream 27 that is the abrasive water jet 26 that has reached the back side of the core shroud 30 flows into the recovery container 9E. When the core shroud 30 is cut using the abrasive water jet 26, the cutting device 2 that is moved in the height direction by the mast 25, specifically, the position of the nozzle 4 in the height direction is set to this position. The open / close plate 37 covering the outlet where the high-pressure water flow 27 of the abrasive water jet 26 injected from the existing nozzle 4 is easily sucked is opened.

  The opening / closing control of the opening / closing plate 37 will be specifically described. The position sensor 44 detects the position of the cutting device 2, that is, the nozzle 4 in the height direction based on the moving distance of the mast 25 that moves in the vertical direction. The angle sensor 45 detects an angle in a direction in which the axis of the nozzle 4 faces in a plane perpendicular to the axis of the mast 25. The control device 40 inputs the height of the nozzle 4 detected by the position sensor 44 and the angle detected by the angle sensor 45, and calculates the height of the axis of the nozzle 4 and the ejection direction of the high-pressure water stream 27. The control device 40 outputs an open signal to the opening / closing device 43 that performs the opening / closing operation of the nearest opening / closing plate 37 based on the calculated axial height of the nozzle 4 and the jet direction of the high-pressure water flow 27. By driving the opening / closing device 43, the opening / closing plate 37 covering the discharge port where the high-pressure water flow 27 of the injected abrasive water jet 26 is easily sucked is opened. For example, when the nozzle 4 moves downward and moves away from the discharge port, the control device 40 outputs a close signal to the open / close device 43 that operates the open / close plate 37 provided corresponding to the discharge port. . When the closing signal is input, the opening / closing device 43 closes the opening / closing plate 37 and closes the corresponding outlet. The other opening / closing plate 37 existing at the corresponding position by the movement of the nozzle 4 is similarly opened by the other opening / closing device 43.

  Thus, the high-pressure water stream 27 and the granular waste can be sucked from the discharge port that is easy to suck in relation to the position of the nozzle 4 in the height direction. For this reason, the present Example can also improve the recovery efficiency of granular waste.

  Each example described above is an example which contributed to the cutting of the structural member of the boiling water nuclear power plant, but these examples are the structural member of the pressurized water nuclear power plant which is the nuclear power plant, the thermal power plant. It can also be applied to cutting structural members of other plants such as chemical plants, and cutting structural members for construction such as stone.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the structural member cutting device used for the cutting method of the structural member of Example 1 which is one suitable Example of this invention. It is an expanded sectional view of the collection container shown in FIG. It is an expanded sectional view of the collection container contained in the structural member cutting device used for the cutting method of the structural member of Example 2 which is other examples of the present invention. It is an expanded sectional view of the collection container contained in the structural member cutting device used for the cutting method of the structural member of Example 3 which is other examples of the present invention. It is an expanded sectional view of the collection container contained in the structural member cutting device used for the cutting method of the structural member of Example 4 which is other examples of the present invention. It is an expanded horizontal sectional view of the collection container contained in the structural member cutting device used for the cutting method of the structural member of Example 5 which is another Example of this invention. It is VII-VII sectional drawing of FIG. It is an expanded sectional view of the collection container contained in the structural member cutting device used for the cutting method of the structural member of Example 6 which is other examples of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C, 1D, 1E ... Structural member cutting device, 2 ... Cutting device, 3 ... Mixing part, 4 ... Nozzle, 5 ... High pressure pump, 7 ... Cutting auxiliary agent supply device, 9, 9A, 9B, 9C, 9D, 9E ... Recovery container, 10, 33, 33A, 34, 34A ... Projection, 12 ... Waste collection / purification device, 14 ... Air / water separation device, 16 ... Recovery pump, 17 ... Cyclone separator, 18 ... Filter, 30 ... core shroud, 32 ... bent portion, 35, 36 ... discharge port, 37 ... open / close plate, 40 ... control device, 43 ... open / close device.

Claims (8)

The structural member to be cut is disposed between the open end of the collection container in which an annular protrusion protruding inward is formed at the open end and the nozzle,
Cutting the structural member by ejecting a pressurized liquid containing a cutting aid from the nozzle toward the structural member;
The flow of the liquid containing the cutting particles and the cutting aid of the structural member generated by the cutting, which has passed through the cutting portion of the structural member, is caused to flow into the collection container,
A method for cutting a structural member, wherein a liquid containing the cutting particles and the cutting aid is sucked from the collection container.   The method for cutting a structural member according to claim 1, wherein as the recovery container, a recovery container in which a barb extending to the bottom surface of the recovery container in the axial direction of the recovery container is formed on the protrusion. The structural member to be cut is disposed between the open end of the collection container provided with the flow velocity suppressing device on the inner surface and the nozzle,
Cutting the structural member by ejecting a pressurized liquid containing a cutting aid from the nozzle toward the structural member;
The flow of the liquid containing the cutting particles and the cutting aid of the structural member generated by the cutting, which has passed through the cutting portion of the structural member, is caused to flow into the collection container,
A method for cutting a structural member, wherein a liquid containing the cutting particles and the cutting aid is sucked from the collection container. The structural member to be cut is disposed between the open end of the collection container in which a plurality of discharge ports are formed at the bottom and the nozzle,
Cutting the structural member by ejecting a pressurized liquid containing a cutting aid from the nozzle toward the structural member;
The flow of the liquid containing the cutting particles and the cutting aid of the structural member generated by the cutting, which has passed through the cutting portion of the structural member, is caused to flow into the collection container,
A method for cutting a structural member, wherein a liquid containing the cutting particles and the cutting aid is sucked from the discharge port of the recovery container.   The method for cutting a structural member according to claim 4, wherein opening / closing means provided at each of the discharge ports for opening / closing the discharge port is opened / closed based on a position of the nozzle. A nozzle to which each of the cutting aid from the cutting aid supply device and the liquid pressurized by the pump is supplied;
A recovery container in which an annular protrusion protruding toward the inside is formed at an open end, the cutting aid and the liquid sprayed from the nozzle, and cutting particles of a structural member to be cut are flown;
A structural member cutting device comprising: a suction device connected to the recovery container. A nozzle to which each of the cutting aid from the cutting aid supply device and the liquid pressurized by the pump is supplied;
The cutting aid and the liquid ejected from the nozzle, and the cutting particles of the structural member to be cut are flowed in, and a recovery container provided with a flow rate suppressing device on the inner surface;
A structural member cutting device comprising: a suction device connected to the recovery container. A nozzle to which each of the cutting aid from the cutting aid supply device and the liquid pressurized by the pump is supplied;
A collection container in which the cutting aid and the liquid sprayed from the nozzle and cutting particles of the structural member to be cut are flowed, and a plurality of discharge ports are formed at the bottom;
A structural member cutting device comprising: a suction device connected to the recovery container.

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