JP6822850B2 - Drilling methods for water jet systems and concrete structures - Google Patents

Description

The present invention relates to a water jet system and a method for drilling holes in a concrete structure.

A technique for drilling through holes in a concrete structure using a water jet has been proposed. For example, in Patent Document 1, a water nozzle head that injects a water jet into a concrete structure and a water nozzle head that injects water jet into the concrete structure while covering the surface of the concrete structure and the water nozzle head so as to seal the water nozzle head. A device including a recovery cover for collecting liquid and processing waste of a water jet is disclosed.

Japanese Unexamined Patent Publication No. 11-32957

By the way, in the renovation of the concrete structure of a nuclear facility or the renovation of a concrete structure of a general facility in an in-service state, a through hole is provided in the concrete structure for the purpose of adding pipes, conduits or openings. Work to drill holes is required. When drilling through holes, it is a constraint that the reinforcing bars of the concrete structure and buried objects such as pipes are not damaged and that there is no water leakage to the surroundings. However, with dry core drills and the like, damage to the buried parts of the concrete structure is unavoidable. On the other hand, with the water jet technology as described above, it is possible to prevent the water jet and the processing waste from scattering, but the processing waste stays inside the collection cover or the collection cover due to the large processing waste. It is not possible to sufficiently prevent blockage of the discharge port and water leakage associated therewith. Therefore, improvement is desired.

Therefore, the present invention presents a water jet system and a method for drilling holes in a concrete structure that can reduce the retention of work chips inside the recovery cover, the blockage of the discharge port of the recovery cover due to large work chips, and the water leakage associated therewith. The purpose is to provide.

The present invention comprises a water nozzle head that injects a water jet into a concrete structure, and a water jet that is ejected from the water nozzle head into the concrete structure while covering the surface of the concrete structure and the water nozzle head so as to be sealed. It is equipped with a recovery cover that collects water from the water, and the recovery cover has an air supply port connected to an air supply line that supplies gas, and a discharge that discharges the gas supplied from the air supply line through the air supply port. A water jet system with a discharge port connected to a line.

According to this configuration, the water nozzle head that injects a water jet into the concrete structure and the surface of the concrete structure and the water nozzle head are covered so as to be sealed, and the water is ejected from the water nozzle head to the concrete structure. In a water jet system equipped with a recovery cover that collects water from the water jet, gas is supplied by the air supply port connected to the air supply line, and the air supply port is supplied from the air supply port by the discharge port connected to the discharge line. By discharging the gas supplied through the recovery cover, the gas is circulated inside the recovery cover, so that the processing waste stays inside the recovery cover or the discharge port of the recovery cover is blocked by a large processing waste. And the water leakage associated with them can be reduced.

In this case, the air supply port injects the gas supplied from the air supply line into the inside of the recovery cover in a direction deviated from the center of the inside of the recovery cover, thereby entering the inside of the recovery cover from the air supply line. It is preferable to generate a swirling flow of the gas supplied through the air supply port.

According to this configuration, the gas supplied from the air supply line is injected into the inside of the recovery cover in a direction deviated from the center of the inside of the recovery cover by the air supply port, so that the gas is supplied to the inside of the recovery cover. A swirling flow of gas supplied from the line through the air supply port is generated, and the gas having a flow velocity of a certain level or higher is distributed over the entire inner wall of the recovery cover, and processing inside the recovery cover. It is possible to further reduce the accumulation of debris or the obstruction of the discharge port of the collection cover due to large-sized processed debris.

Further, it is preferable that the discharge line is connected to a suction portion that generates a negative pressure inside the recovery cover.

According to this configuration, a negative pressure is generated inside the recovery cover by the suction part connected to the discharge line, so that the water of the water jet through the crack existing in the concrete structure from the hole drilled by the water jet Water leakage can be reduced.

Further, the recovery cover further has a recovery cover internal pressure detection unit that detects the internal pressure of the recovery cover, and when the recovery cover internal pressure detection unit detects an increase in the internal pressure of the recovery cover, a water jet is ejected from the water nozzle head. Further, it is preferable to further include a stop control unit for stopping the supply of gas through the air supply port from the air supply line.

According to this configuration, despite the circulation of gas inside the recovery cover, the internal pressure of the recovery cover increases when the internal pressure of the recovery cover increases due to the retention of processing waste or the blockage of the discharge port due to large processing waste. The detection unit detects an increase in the internal pressure of the recovery cover, and the stop control unit stops the ejection of the water jet from the water nozzle head and the supply of gas through the air supply port from the air supply line. It is possible to prevent water leakage due to blockage of the outlet.

In this case, the recovery cover is an inner compartment that seals the surface of the water nozzle head and the concrete structure facing the water nozzle head, an outer compartment that seals the surface of the concrete structure outside the inner compartment, and an outer compartment. It further has an outer compartment internal pressure detecting unit for detecting the internal pressure of the concrete, and the stop control unit ejects and supplies a water jet from the water nozzle head when the outer compartment internal pressure detecting unit detects an increase in the internal pressure of the outer compartment. It is preferable to stop the supply of gas from the air supply port through the air supply port.

According to this configuration, when water leaks from the inner section to the outer section due to insufficient adhesion between the concrete wall surface and the rubber seal or the rubber seal is damaged and the internal pressure of the outer section increases, the outer section internal pressure detection unit performs the outer side. An increase in the internal pressure of the compartment is detected, and the stop control unit stops the ejection of the water jet from the water nozzle head and the supply of gas through the air supply port from the air supply line, so that the gas is supplied to the outside of the recovery cover. Water leakage can be prevented more effectively.

In this case, it is preferable that the recovery cover further has an outer compartment decompression portion that creates a negative pressure inside the outer compartment.

According to this configuration, since the negative pressure is generated inside the outer compartment by the outer compartment decompression portion, the outer compartment internal pressure detecting portion can easily detect an increase in the internal pressure of the outer compartment due to water leakage from the inner compartment to the outer compartment.

Further, it is preferable that the recovery cover has a plurality of discharge ports for recovering the gas supplied from the air supply line through the air supply port and the water of the water jet.

According to this configuration, the recovery cover has a plurality of discharge ports for recovering the gas supplied from the air supply line through the air supply port and the water of the water jet, so that the processing waste is retained or large-scale processing is performed. It is possible to further reduce the blockage of the discharge port of the collection cover due to waste.

In this case, it is preferable that at least one of the plurality of discharge ports is arranged so as to open in a direction different from the direction in which the gas supplied from the air supply line through the air supply port flows.

According to this configuration, at least one of the plurality of discharge ports is arranged so as to open in a direction different from the direction in which the gas supplied from the air supply line through the air supply port flows. Blockage due to accumulation of debris is unlikely to occur. Therefore, it is possible to prevent all the discharge ports from being continuously blocked and water leakage from occurring when the other discharge ports are blocked due to the accumulation of work chips.

Further, the water nozzle head is connected to the tip of the inner pipe of the rod having the inner pipe and the outer pipe surrounding the inner pipe, and the water of the water jet is supplied through the inside of the inner pipe of the rod. It is preferable that the gas supplied through the inner pipe and the outer pipe is ejected from between the tip of the inner pipe and the tip of the outer pipe.

According to this configuration, the water nozzle head is connected to the tip of the inner pipe of the rod having the inner pipe and the outer pipe surrounding the inner pipe, and the water of the water jet is supplied through the inside of the inner pipe of the rod. , The rod ejects the gas supplied through the inner pipe and the outer pipe from between the inner pipe and the tip and the tip of the outer pipe, so that the gas is supplied through the inner pipe and the outer pipe. The vaporized gas can discharge the work chips from the holes drilled by the water jet as needed, and dry the inner surface of the holes drilled by the water jet as needed.

Further, on the back surface opposite to the front surface of the concrete structure, a back surface cover is further provided to cover the through holes drilled by the water jet so as to seal the through holes, and the inner surface of the back surface cover is the inner surface of the back surface cover and the concrete structure. At the boundary with the back surface of the object, it is preferable to have an inclined surface inclined toward the center side of the back surface cover.

According to this configuration, the inner surface of the back cover that covers the back surface of the concrete structure so as to seal the through hole drilled by the water jet is the back surface at the boundary between the inner surface of the back cover and the back surface of the concrete structure. It has an inclined surface that is inclined toward the center side of the cover. Therefore, the water of the water jet, which is ejected from the through hole drilled by the water jet, hits the inner surface of the back cover and returns to the back surface of the concrete structure, is the back surface at the boundary between the inner surface of the back cover and the back surface of the concrete structure. The inclined surface of the inner surface of the back cover inclined to the center side of the cover guides the back cover to the center side, and the airtightness of the rubber seal is deteriorated or damaged due to the outward flow of the back cover along the back surface of the concrete structure. Can be prevented. Therefore, the water of the water jet that is ejected from the through hole drilled by the water jet, hits the inner surface of the back cover, and returns to the back surface of the concrete structure is near the boundary between the inner surface of the back cover and the back surface of the concrete structure. It is possible to prevent the rubber seal from being deteriorated or damaged due to the outward flow of the back cover along the back surface of the concrete structure by hitting the back surface of the concrete structure at an angle close to vertical.

In this case, it is preferable that the back cover has an air nozzle that injects gas into the back cover toward the inside of the back cover.

According to this configuration, by injecting a gas such as nitrogen gas from the air nozzle into the inside of the back cover by the air nozzle, the inside of the back cover can be dried and the residue inside the back cover can be removed.

Further, it is preferable that the water nozzle head is further provided with a forward / backward advance rail that can move forward and backward with respect to the concrete structure, and the forward / backward advance rail is integrated with the recovery cover and attached to the surface of the concrete structure via the recovery cover. Is.

According to this configuration, the forward / backward rail that allows the water nozzle head to move forward and backward with respect to the concrete structure is integrated with the recovery cover and attached to the surface of the concrete structure via the recovery cover. It is possible to move the position where the hole is drilled with the forward / backward rail and the recovery cover integrated, and the movement time can be shortened.

Further, the recovery cover is provided on the outer disk that is rotatable around the central axis facing the surface side of the concrete structure and the inner surface of the outer disk at the portion where the surface of the concrete structure and the inner surface of the recovery cover face each other. The water nozzle head is located at a position separated from the central axis of the inner disk, with a rotatable inner disk around the central axis that is arranged and separated from the central axis of the outer disk while facing the surface side of the concrete structure. It is preferable that the concrete structure is arranged on the inner disk so as to inject a water jet from the concrete structure.

According to this configuration, the recovery cover has an outer disk that is rotatable around a central axis facing the surface side of the concrete structure and an outer side at a portion where the surface of the concrete structure and the inner surface of the recovery cover face each other. Arranged inside the disk, it has an inner disk that is rotatable around a central axis away from the central axis of the outer disk while facing the surface side of the concrete structure, and the water nozzle head is the central axis of the inner disk. It is arranged on the inner disk so as to inject a water jet into the concrete structure from a position away from the concrete structure. Therefore, the position where the water nozzle head ejects the water jet can be changed by rotating the outer disk and the inner disk as necessary.

In this case, the inner disk is arranged so that the water nozzle head that ejects the water jet to the concrete structure and the abrasive nozzle head that ejects the abrasive jet to the concrete structure are exchanged and arranged, and the recovery cover is on the outside. It is preferable to further have a constant speed rotation drive unit that rotates the disk at a constant speed.

According to this configuration, the inner disk is arranged so that the water nozzle head that ejects the water jet to the concrete structure and the abrasive nozzle head that ejects the abrasive jet to the concrete structure are exchanged and arranged at a constant speed. Since the outer disk is rotated at a constant speed by the rotation drive unit, for example, if the presence of reinforcing bars in a concrete structure is found after starting drilling, the water nozzle head can be used without replacing the entire system. After replacing with an abrasive nozzle head and rotating the inner disk on which the abrasive nozzle head is placed to an arbitrary position and then fixing it, the outer disk is ejected while injecting an abrasive jet from the abrasive nozzle head. By rotating at a constant speed, it is possible to cut the reinforcing bars existing at various positions.

Further, in the present invention, the surface of the concrete structure and the water nozzle head are sealed with a step of arranging a water nozzle head for injecting a water jet in the vicinity of the concrete structure and a recovery cover for collecting the water of the water jet. A step of covering so as to be performed, a step of connecting an air supply line to an air supply port provided on the recovery cover, a step of connecting a discharge line to a discharge port provided on the recovery cover, and a step of supplying gas from the air supply port. This is a drilling method for a concrete structure, which includes a step of discharging the gas supplied from the air supply port from the discharge port and injecting a water jet from the water nozzle head.

According to such a method, when drilling a hole in a concrete structure, it is possible to reduce the retention of work chips inside the recovery cover, the blockage of the discharge port of the recovery cover due to large work chips, and the water leakage associated therewith. ..

According to the water jet system of the present invention and the method for drilling holes in a concrete structure, the water jet water and work debris stay inside the recovery cover, or the discharge port of the recovery cover is blocked by a large work debris, and associated therewith. Water leakage can be reduced.

It is a block diagram which shows the structure of the water jet system of 1st Embodiment. It is a figure which shows the outline of the water nozzle head, the rod and the recovery cover of FIG. (A) is a front view showing the details of the recovery cover of FIG. 1, and (B) is a sectional view taken along line α of (A). (A) is a cross-sectional view taken along the line β of FIG. 3 (B), and (B) is a cross-sectional view taken along the line γ of FIG. 3 (A). FIG. 3 (B) is an enlarged view showing details of sealing the surface of the concrete structure by the recovery cover of FIG. 3 (B). It is a vertical sectional view which shows the detail of the water nozzle head and a rod of FIG. (A) is a vertical cross-sectional view showing the details of the rod of FIG. 6, and (B) is a diagram showing the details of the portion of the gas (A) for ejecting. (A) is a plan view showing the details of the water tank of FIG. 1, and (B) is a partial cross-sectional view of a side view showing the details of the water tank of FIG. (A) is a front view showing the details of the back cover of FIG. 1, and (B) is a cross-sectional view taken along the line δ of (A). It is a figure which shows the front-rear rail and the recovery cover of the water jet system of 2nd Embodiment. (A) is a front view showing the details of the recovery cover of the third embodiment, and (B) is a cross-sectional view taken along line ε of (A). (A) is a front view showing the details of the recovery cover of the fourth embodiment, and (B) is a cross-sectional view taken along the line ζ of (A).

Hereinafter, embodiments of a water jet system and a method for drilling holes in a concrete structure according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the water jet system 1 of the first embodiment of the present invention includes a water nozzle head 10 for injecting a water jet onto a concrete structure C, a surface S of the concrete structure C, and a water nozzle head 10. It is provided with a recovery cover 11a for recovering the water of the water jet jetted from the water nozzle head 10 onto the concrete structure C while covering the water so as to seal the water jet. The water jet system 1 is used for repairing the concrete structure C of a nuclear facility or repairing a concrete structure C of a general facility in an in-service state without causing water leakage, air leakage, processing waste, etc. to the surroundings. , A through hole is drilled in the concrete structure C by a water jet.

First, the outline of the water jet system 1 will be described. The water jet system includes a water tank 2 that is connected to the water supply and stores water from the water supply. The water jet system 1 includes a high-pressure pump 3 that sends the water stored in the water supply tank 2 to the water supply line 4 to the water nozzle head 10 at high pressure. A forward / backward rail 6 is attached to the surface S of the concrete structure C via the base 5. The swivel shaft 8, the rod 9, and the water nozzle head 10 are supported by the rod support portion 7 that is slidable on the forward / backward rail 6. The forward / backward rail 6 supports the water nozzle head 10 so as to be able to move forward and backward with respect to the concrete structure C. A water supply line 4 is connected to the swivel shaft 8 to supply water from the high pressure pump 3. The rod support portion 7 has an air motor (not shown), and the air motor rotates the swivel shaft 8, a part of the rod 9, and the water nozzle head 10.

The water jet system 1 includes a compressor 12 that supplies compressed air. The compressor 12 supplies air to the air supply line 13a for driving the air motor of the rod support portion 7, the air supply line 13b for ejecting air from the rod 9, and the air supply port 14 of the recovery cover 11a. It is connected to the air supply line 13c. The air supply lines 13a, 13b, and 13c may be supplied with another gas such as nitrogen gas instead of air. As shown in FIGS. 1 and 2, the recovery cover 11a has an air supply port 14 connected to an air supply line 13c for supplying gas, and a gas supplied from the air supply line 13c via the air supply port 14. It has a discharge port 15 connected to a discharge line 16 for discharging the gas. As shown in FIG. 2, inside the recovery cover 11a, a swirling flow F of gas supplied from the air supply line 13c through the air supply port 14 is generated.

As shown in FIG. 2, the water nozzle head 10 is connected to the tip of the inner pipe 27 of the rod 9 having the inner pipe 27 and the outer pipe 28 surrounding the inner pipe 27, and the inside of the inner pipe 27 of the rod 9 is connected. The water of the water jet J is supplied through the water jet J. A hole h is drilled in the concrete structure C by the water jet J. The air motor of the rod support portion 7 driven by the air supply from the air supply line 13a rotates the inner pipe 27 connected to the tip of the swivel shaft 8 and the water nozzle head 10. The outer tube 28 cannot be rotated. The rod 9 ejects the gas A supplied from the air supply line 13b between the inner pipe 27 and the outer pipe 28 from between the tip of the inner pipe 27 and the tip of the outer pipe 28. The discharge port 15 and the discharge line 16 are formed by cutting the gas supplied from the air supply line 13c through the air supply port 14, the gas A ejected from the rod 9, the water of the water jet J, and the water jet J. Drain the mixture with the drilling debris.

When the hole h to be drilled extends in the vertical direction, it is preferable that the gas A ejected from the rod 9 is also ejected during the drilling. The gas A ejected from the rod 9 is particularly effective when the processing waste is discharged from the hole h extending in the vertical direction. However, when the hole h to be drilled extends in the horizontal direction, the gas A ejected from the rod 9 does not have to be ejected during the drilling, and the hole h is dried at the end of the drilling. It may be ejected.

Returning to FIG. 1, as will be described later, when the water jet system 1 detects an increase in the internal pressure of the recovery cover 11a, the water jet J is ejected from the water nozzle head 10 and from the air supply lines 13a, 13b, 13c. A stop control unit 17 for stopping the supply of air is provided. Further, the water jet system 1 includes a water receiving tank 18 connected to a discharge line 16 to which a mixture of gas, water, and processing waste is delivered. The water receiving tank 18 has a cyclone 19 for separating the mixture sent out from the discharge line 16 into gas, turbid water, and processing waste. An exhaust line 20 for exhausting the gas separated by the cyclone 19 is connected to the cyclone 19. A suction unit 21 is connected to the exhaust line 20. The discharge line 16 is connected to a suction unit 21 that generates a negative pressure inside the recovery cover 11a via the exhaust line 20.

The method of drilling a hole in the concrete structure C using the water jet system 1 as described above is performed as follows. That is, the water nozzle head 10 for injecting the water jet J is arranged near the opening position of the concrete structure C to be drilled, and the recovery cover 11a for collecting the water of the water jet J is used to cover the surface S of the concrete structure C. And the water nozzle head 10 so as to be sealed. Further, the air supply line 13c is connected to the air supply port 14 provided on the recovery cover 10a, and the discharge line 16 is connected to the discharge port 15 provided on the recovery cover 10a. Then, gas is supplied from the air supply port 14, and while the gas supplied from the air supply port 14 is discharged from the discharge port 15, a water jet J is injected from the water nozzle head 10 to drill a hole. As the drilling progresses, the water nozzle head 10 also advances in the drilled hole h. In this way, the concrete structure C is drilled.

A drainage line 22 for draining the muddy water separated by the cyclone 19 is connected to the water receiving tank 18. A drainage tube pump 23 for sending turbid water to the settling tank 24 is connected to the drainage line 22. The water from which the filth has been removed by precipitation in the settling tank 24 is treated by the treatment tank 25. The water treated by the treatment tank 25 is discharged as sewage. Further, the water jet system 1 includes a back surface cover 26 that covers the back surface B of the concrete structure C opposite to the surface S so as to seal the through holes drilled by the water jet J.

Hereinafter, details of each part of the water jet system 1 of the present embodiment will be described. As shown in FIGS. 3A and 3B, the recovery cover 11a has a rod through hole 29 for inserting the rod 9 into the recovery cover 11a. The side wall of the rod through hole 29 includes a purge line connection port 30 connected to a purge line (not shown) that supplies water for cleaning work chips adhering to the outer surface of the rod 9. The recovery cover 11a has four fixtures 31 for fixing the recovery cover 11a to the surface S by an anchor 32 driven into the surface S of the concrete structure C. The hole through which the anchor 32 of the fixture 31 passes has an elliptical shape in which the major axis and the minor axis are larger than the outer diameter of the anchor 32 in order to cope with the case where the position accuracy of the anchor 32 is poor. Further, the angle at which the fixture 31 is attached to the recovery cover 11a can be changed freely.

The recovery cover 11a is supplied from two air supply ports 14a and 14b, which are air supply ports 14 connected to the gas supply line 13c, and from the air supply line 13c via the air supply ports 14a and 14b. It has two discharge ports 15a and 15b, which are discharge ports 15 connected to a discharge line 16 for discharging the gas. The air supply ports 14a and 14b include an opening 33 inside the recovery cover 11a. The discharge ports 15a and 15b include an opening 34 inside the recovery cover 11a.

As shown in FIGS. 3 (A), 3 (B), 4 (A), and 4 (B), the air supply ports 14a and 14b are oriented in a direction deviated from the center M inside the recovery cover 11a. By injecting the gas supplied from the air supply line 13c into the inside of the recovery cover 11a, the gas supplied from the air supply line 13c through the air supply ports 14a and 14b swirls inside the recovery cover 11a. Generate flow F. In the present embodiment, when viewed from the side of the surface S of the concrete structure C, the inside of the recovery cover 11a turns clockwise away from the surface S and mainly enters the discharge port 15a. A swirling flow F is generated. For example, when the inner diameter of the recovery cover 11a is 240 [mm], a swirling flow F having an air volume of about 1 [m ³ / min] is required.

As shown in FIGS. 3A and 3B, the recovery cover 11a has a recovery cover internal pressure detection port 35. The recovery cover 11a is connected to the recovery cover internal pressure detection port 35, and has a recovery cover internal pressure detection unit 36 that detects the internal pressure of the recovery cover 11a by a pressure sensor or the like.

The water jet system 1 transmits a command signal to the high-pressure pump 3 and the compressor 12 when the recovery cover internal pressure detecting unit 36 detects an increase in the internal pressure of the recovery cover 11a, thereby causing the water jet J from the water nozzle head 10. The stop control unit 17 for stopping the supply of gas through the air supply port from the air supply line 13c and the ejection of the gas is provided. The stop control unit 17 is composed of an electronic control unit having a CPU [Central Processing Unit], a ROM [Read Only Memory], a RAM [Random Access Memory], and the like. When the recovery cover internal pressure detecting unit 36 detects an increase in the internal pressure of the recovery cover 11a, the stop control unit 17 stops the supply of gas from the air supply lines 13a and 13b, and the drilling is stopped.

As shown in FIGS. 3A and 3B, the recovery cover 11a includes the water nozzle head 10 and the inner section 37 that seals the surface S of the concrete structure C facing the water nozzle head 10 and the inner side. It has an outer section 38 that seals the surface S of the concrete structure C on the outside of the inner section 37 while surrounding the outer periphery of the section 37. The recovery cover 11a is connected to the vacuum pulling port 39, and has an outer compartment internal pressure detecting unit 40 that detects the internal pressure of the outer compartment 38 by a pressure sensor or the like. For example, when the water of the water jet J leaks from the inner section 37 to the outer section 38 during drilling, the outer section internal pressure detecting unit 40 detects an increase in the internal pressure of the outer section 38.

When the outer compartment internal pressure detecting unit 40 detects an increase in the internal pressure of the outer compartment 38, the stop control unit 17 transmits a command signal to the high pressure pump 3 and the compressor 12, so that the water jet J from the water nozzle head 10 And the supply of gas from the air supply line 13c through the air supply ports 14a and 14b is stopped. When the outer compartment internal pressure detecting unit 40 detects an increase in the internal pressure of the outer compartment 38, the stop control unit 17 stops the supply of gas from the air supply lines 13a and 13b, and the drilling is stopped.

The stop control unit 17 ejects the water jet J from the water nozzle head 10 and the air supply ports 14a and 14b from the air supply line 13c when a significant decrease in the vibration level of the hose of the discharge line 16 is detected. The gas supply via the air supply line and the gas supply from the air supply lines 13a and 13b may be stopped. The recovery cover 11a is connected to the vacuum drawing port 39, and further has an outer section decompression unit 41 that generates a negative pressure inside the outer section 38 by a vacuum pulling pump or the like.

As shown in FIG. 3A, the recovery cover 11a has a plurality of discharge ports 15a and 15b for recovering the gas supplied from the air supply line 13c via the air supply port 14a and the water of the water jet J. Have. When one discharge port 15a is blocked by work chips, the internal pressure of the recovery cover 11a increases, so that the stop control unit 17 immediately stops drilling. At least one of the plurality of discharge ports 15a and 15b is arranged so as to open in a direction different from the direction in which the gas supplied from the air supply line 13c through the air supply ports 14a and 14b flows. In the present embodiment, the discharge port 15a is arranged so as to open in the direction in which the swirling flow F of the gas supplied from the air supply line 13c via the air supply ports 14a and 14b flows, but the discharge port 15b Is arranged so as to open in a direction different from the direction in which the swirling flow F of the gas supplied from the air supply line 13c through the air supply ports 14a and 14b flows.

The discharge direction of the collection covers 11a of the discharge ports 15a and 15b to the outside may be freely changed by an elbow or the like. As a result, it is possible to deal with the case where there is an obstacle such as a pipe around the position where the hole is drilled.

As shown in FIGS. 3 (B), 4 (B) and 5, the recovery cover 11a is provided on the partition wall between the inner section 37 and the outer section 38 in the vicinity of the surface S of the concrete structure C. It has a flange 42a and a flange 42b provided on the outer wall of the outer compartment 38. A hard rubber 43, a sponge rubber 44 for sealing the surface S of the concrete structure C, and a ring 45 for fixing the hard rubber 43 and the sponge rubber 44 are attached to the flange 42a in this order from the inside.

Since the hole h has not yet been drilled immediately after the drilling by the water jet J is started, the high-pressure water of the water jet J flows along the surface S and is between the inner compartment 37 and the outer compartment 38. It hits the partition vertically, and the water of the water jet J may leak from the inner compartment 37 to the outer compartment 38. However, since the hard rubber 43 is attached to the flange 42a, it is possible to reduce water leakage from the inner compartment 37 to the outer compartment 38 immediately after the drilling by the water jet J is started.

A sponge rubber 44 for sealing the surface S of the concrete structure C and a ring 45 for fixing the sponge rubber 44 are attached to the flange 42b in this order from the inside. In the outer wall of the outer compartment 38, the partition wall between the inner compartment 37 and the outer compartment 38 prevents the water of the water jet J from directly hitting even immediately after the drilling by the water jet J is started. , The hard rubber 43 may not be attached to the flange 42b. By fixing the recovery cover 11a to the surface S by the fixture 31 and the anchor 32, the sealing is maintained until the internal pressure of the recovery cover 11a reaches about 2 atm.

When the water nozzle head 10 is replaced during drilling, or when the device of the water jet system 1 is removed after the drilling is completed, the water supply from the high pressure pump 3 via the water supply line 4 is stopped to stop the water supply. When there is no supply, the inside of the recovery cover 11a is dried and the residue inside the recovery cover 11a is removed by the swirling flow F of the gas supplied from the air supply line 13c through the air supply ports 14a and 14b. can do.

As shown in FIGS. 6 and 7 (A), the water nozzle head 10 is connected to the tip of the inner pipe 27 of the rod 9 having the inner pipe 27 and the outer pipe 28 surrounding the inner pipe 27 via a connecting portion 46. It is connected. The outer diameters of the water nozzle head 10, the inner pipe 27, and the outer pipe 28 are determined according to the inner diameter of the hole h to be drilled. For example, when the outer diameter of the inner pipe 27 is 30 [mm], the outer pipe The inner diameter of 28 is 36 [mm], the outer diameter of the outer tube 28 is 38 [mm], and the thickness of the tube wall of the outer tube 28 is as thin as 1 [mm].

The length of the inner pipe 27 can be changed by adding it to an arbitrary length by a plurality of connecting portions 47. Therefore, for example, in a place where there is no depth such as a corridor of a concrete structure C, the length of the forward / backward rail 6 cannot be increased, and the length of the rod 9 can be increased from the start of drilling. If this is not possible, the drilling work can be performed by adding only the inner pipe 27 to an arbitrary length without using the outer pipe 28.

The outer pipe 28 is connected to the outer flange 48 via the outer pipe connecting piece 49 in the vicinity of the swivel shaft 8. A radial bearing 50 fixed by a bearing stop piece 51 is arranged between the outer flange 48 and the inner pipe 27. The radial bearing 50 causes the inner pipe 27 to rotate with the rotation of the swivel shaft 8 with respect to the non-rotating outer flange 48, the outer pipe connecting piece 49, and the outer pipe 28. The water nozzle head 10 is rotated along with the rotation of the inner pipe 27, and the water of the water jet J is supplied through the inside of the inner pipe 27 of the rod 9, so that the water jet J is ejected to the concrete structure C. To do.

The outer pipe 28 includes a rod air air supply port 52 connected to the air supply line 13b on the pipe wall thereof. The rod 9 transfers the gas A supplied from the air supply line 13b and the rod air air supply port 52 between the inner pipe 27 and the outer pipe 28 between the tip of the inner pipe 27 and the tip of the outer pipe 28. Squirt from. As shown in FIGS. 6, 7 (A) and 7 (B), between the tip of the inner tube 27 and the tip of the outer tube 28, the outer peripheral surface of the inner tube 27 is a ring for vibration and diffusion injection. 53 is attached. The anti-vibration / diffusion injection ring 53 prevents the inner pipe 27 from vibrating due to the injection of the water jet J. Further, the gas A is ejected from the gap between the anti-vibration / diffusion injection ring 53 and the inner surface of the outer pipe 28.

When the water nozzle head 10 is replaced during drilling, or when the device of the water jet system 1 is removed after the drilling is completed, the water supply from the high pressure pump 3 via the water supply line 4 is stopped to stop the water supply. In the state where there is no supply, the gas A supplied from the air supply line 13b and the rod air air supply port 52 through between the inner pipe 27 and the outer pipe 28 is sent to the tip of the inner pipe 27 and the tip of the outer pipe 28. By ejecting from between, the inside of the hole h can be dried and the residue inside the hole h can be removed. In this case, for example, it is unnecessary when the inner diameter of the hole h is about 80 [mm], but when the inner diameter of the hole h is about 300 [mm], the hole h is separately subjected to negative pressure suction. It is necessary to remove the residue inside the.

As shown in FIGS. 8A and 8B, the water tank 18 is formed of a drum can whose upper end is sealed by a bolt band 54. The water receiving tank 18 has a cyclone 19 on its upper surface for separating the mixture sent out from the discharge line 16 into gas, turbid water, and processing waste. The cyclone 19 includes a discharge line connection port 55 connected to the discharge line 16 on its side surface. Further, the cyclone 19 includes an exhaust line connection port 56 connected to the exhaust line 20 at the upper end thereof.

As shown in FIG. 1, the exhaust line 20 is connected to the suction unit 21, so that the exhaust line 16 is connected to the suction unit 21 that generates a negative pressure inside the recovery cover 11a. The suction unit 21 creates a negative pressure inside the recovery cover 11a by sucking a flow rate equal to or greater than the amount of air supplied through the air supply lines 13b and 13c of the compressor 12. As shown in FIGS. 8 (A) and 8 (B), the cyclone 19 is sealed by the cyclone packing 57. The water receiving tank 18 has a drainage line connection port 58 connected to the drainage line 22 on its upper surface. The water receiving tank 18 has a spare port 59 on its upper surface.

As shown in FIG. 8 (B), the cyclone 19 separates the mixture sent out from the discharge line 16 into gas, turbid water W, and processing waste T. The work waste T is settled at the bottom of the water receiving tank 18, and the turbid water W is separated above the work waste T. The gas is exhausted from the exhaust line 20 via the exhaust line connection port 56, and the muddy water W is drained from the drain line 22 via the drain line connection port 58. By separating the work waste T from the mixture, the exhaust resistance of the exhaust line 20 and the drain line 22 can be reduced.

As shown in FIGS. 9 (A) and 9 (B), the water jet system 1 provides a through hole H drilled by the water jet J on the back surface B of the concrete structure C opposite to the front surface S. A back cover 26 that covers the surface so as to be sealed is provided. The back surface cover 26 is fixed to the back surface B of the concrete structure C by the fixture 31 and the anchor 32, similarly to the recovery cover 11a. The back surface cover 26 has a flange 42a, a hard rubber 43, a sponge rubber 44, and a ring 45 similar to the recovery cover 11a in order to seal the back surface B.

The back cover 26 has a slurry discharge air nozzle 60 on its side wall. Similar to the air supply ports 14a and 14b of the recovery cover 11a, the slurry discharge air nozzle 60 injects gas into the back surface cover 26 in a direction deviated from the center M inside the back surface cover 26, thereby injecting gas into the back surface cover 26. A swirling flow of gas is generated inside the cover 26. The back cover 26 has a slurry discharge port 61 on its side wall.

As shown in FIG. 9B, the inner surface 62 of the back cover 26 has an opening 63 of the slurry discharge air nozzle 60 and an opening of a slurry discharge port 61 (not shown). The inner surface 62 of the back cover 26 has an inclined surface 64 that is inclined toward the center of the back cover 26 at the boundary between the inner surface 62 of the back cover 26 and the back surface B of the concrete structure C.

If the inner surface 62 of the back cover 26 is perpendicular to the back surface B at the boundary between the inner surface 62 of the back cover 26 and the back surface B of the concrete structure C, immediately after the hole is drilled by the water jet J. The water of the water jet J, which is ejected from the through hole H, hits the inner surface 62 of the back surface cover 26, and returns to the back surface B, is at an angle close to perpendicular to the back surface B near the boundary between the inner surface 62 and the back surface B of the back surface cover 26. Upon hitting, there is a possibility that the airtightness of the rubber seal may be lowered or damaged due to the outward flow of the back cover 26 along the back surface B of the concrete structure C.

Therefore, in the present embodiment, the water of the water jet J, which is ejected from the through hole H immediately after being drilled by the water jet J, hits the inner surface 62 of the back cover 26, and returns to the back surface B, is the inner surface 62 of the back cover 26. The back surface cover 26 along the back surface B of the concrete structure C is guided to the center side of the back surface cover 26 by the inclined surface 64 of the inner surface 62 of the back surface cover 26 inclined toward the center side of the back surface cover 26 at the boundary with the back surface B. It is possible to prevent the rubber seal from being sealed or damaged due to the outward flow of the rubber seal.

When the device of the water jet system 1 is removed after the drilling is completed, the work chips are accumulated under the back surface cover 26. Therefore, for example, in the concrete structure C of the nuclear facility, when the side of the back surface B in which the through hole H is drilled is the controlled area, the nitrogen cylinder and the air nozzle 60 for discharging the slurry are connected to collect the processing waste. The inside of the back surface cover 26 is dried by injecting nitrogen gas from the nitrogen cylinder into the inside of the back surface cover 26 from the air nozzle 60 for exhausting the slurry in a state where the container and the slurry discharge port 61 are connected. Residues inside the can be removed. As a result, in the controlled area of the nuclear facility, it is possible to cope with the situation where it is difficult to dry and remove the residue by air in the controlled area.

Further, when the device of the water jet system 1 is removed after the drilling is completed, for example, a switching valve provided in the water supply line 4 of the high pressure pump 3 connects the high pressure pump 3 and the water supply line 4 to the compressor 12 and water supply. By switching to the connection with the line 4 and supplying gas from the water supply line 4 to all the pipes of the water jet system 1, the residual water in the pipes can be removed and water leakage at the time of removing the pipes can be prevented. ..

In the present embodiment, the water nozzle head 10 that injects the water jet J onto the concrete structure C, the surface S of the concrete structure C, and the water nozzle head 10 are covered so as to be sealed, and the water nozzle head 10 is used for concrete. In the water jet system 1 provided with the recovery cover 10a for recovering the water of the water jet J injected into the structure C, gas is supplied to the discharge line 16 by the air supply port 14 connected to the air supply line 13c. By discharging the gas supplied from the air supply line 13c through the air supply port 14 by the connected discharge port 15, the gas is circulated inside the recovery cover 11a, thereby causing the inside of the recovery cover 11a. It is possible to reduce the clogging of the discharge ports 15a and 15b of the recovery cover 11a due to the retention of the processing waste or the large-sized processing waste, and the water leakage associated therewith. Further, the flow velocity of the mixture of water, gas and work chips in the discharge line 16 outside the recovery cover 11a is secured, the sedimentation and retention of the work chips are prevented, and the blockage in the discharge line 16 outside the recovery cover 11a is reduced. Can be done.

Further, in the present embodiment, the gas supplied from the air supply line 13c is injected into the inside of the recovery cover 11a by the air supply ports 14a and 14b in a direction deviated from the center M inside the recovery cover 11a. , A swirling flow F of gas supplied from the air supply line 13c through the air supply ports 14a and 14b is generated inside the recovery cover 11a, and the flow velocity exceeds a certain level over the entire inner wall of the recovery cover 11a. Since the gas is distributed, it is possible to further reduce the retention of work chips inside the recovery cover 11a or the blockage of the discharge ports 15a and 15b of the recovery cover 11 due to large-sized work chips. Further, the inner wall of the recovery cover 11a can be dried as needed.

Further, according to the present embodiment, since the suction portion 21 connected to the discharge line 16 generates a negative pressure inside the recovery cover 11a, it exists in the concrete structure C from the hole h drilled by the water jet J. It is possible to reduce the leakage of water from the water jet J through the cracks.

Further, according to the present embodiment, despite the circulation of gas inside the recovery cover 11a, the internal pressure of the recovery cover 11a is increased due to the retention of the processing waste or the blockage of the discharge ports 15a and 15b due to the large processing waste. When the increase occurs, the recovery cover internal pressure detection unit 36 detects an increase in the internal pressure of the recovery cover 11a, and the stop control unit 17 ejects the water jet J from the water nozzle head 10 and the air supply port from the air supply line 13c. Since the supply of gas via the 14a and 14b is stopped, it is possible to prevent water leakage due to the blockage of the discharge ports 15a and 15b.

Further, according to the present embodiment, water leaks from the inner section 37 to the outer section 38 due to insufficient adhesion between the surface S of the concrete structure C and the rubber seal by the sponge rubber 44 or damage to the rubber seal, and the outer section 38. When the internal pressure of the outer compartment increases, the outer compartment internal pressure detecting unit 40 detects an increase in the internal pressure of the outer compartment 38, and the stop control unit 17 ejects the water jet J from the water nozzle head 10 and from the air supply line 13c. Since the supply of gas through the air supply ports 14a and 14b is stopped, water leakage to the outside of the recovery cover 11a can be prevented more effectively.

Further, according to the present embodiment, since the outer compartment decompression unit 41 generates a negative pressure inside the outer compartment 38, the outer compartment internal pressure detection unit 40 is the outer compartment 38 due to water leakage from the inner compartment 37 to the outer compartment 38. It is easy to detect an increase in internal pressure.

Further, according to the present embodiment, the recovery cover 11a collects the gas supplied from the air supply line 13c via the air supply ports 14a and 14b and the water of the water jet J, and the plurality of discharge ports 15a and 15b. Therefore, it is possible to further reduce the retention of processing waste or the blockage of the discharge ports 15a and 15b of the recovery cover 11a due to large processing waste.

Further, according to the present embodiment, the discharge port 15b among the plurality of discharge ports 15a and 15b has a direction different from the direction in which the gas supplied from the air supply line 13c through the air supply ports 14a and 14b flows. Since it is arranged so as to open in, it is unlikely to be blocked due to the accumulation of work chips. Therefore, it is possible to prevent the discharge port 15b from being continuously blocked and water leakage when the other discharge port 15a is blocked due to the accumulation of work chips.

Further, according to the present embodiment, the water nozzle head 10 is connected to the tip of the inner pipe 27 of the rod 9 having the inner pipe 27 and the outer pipe 28 surrounding the inner pipe 27, and the inner pipe 27 of the rod 9 is connected. The water of the water jet J is supplied through the inside, and the rod 9 transfers the gas supplied through between the inner pipe 27 and the outer pipe 28 between the inner pipe 27 and the tip and the tip of the outer pipe 28. With the gas supplied through between the inner pipe 27 and the outer pipe 28, the processing waste is discharged from the hole h drilled by the water jet J as necessary, and the work waste is discharged by the water jet J. The inner surface of the drilled hole h can be dried as needed. Further, the flow velocity of the mixture of water, gas and processing waste in the discharge line 16 outside the recovery cover 11a is secured, the sedimentation and retention of the processing waste are prevented, and the blockage in the discharge line 16 outside the recovery cover 11a is reduced. can do.

Further, according to the present embodiment, the inner surface 62 of the back surface cover 26 that covers the back surface B of the concrete structure C so as to seal the through hole H drilled by the water jet J is the inner surface 62 of the back surface cover 26. At the boundary of the concrete structure C with the back surface B, it has an inclined surface 64 that is inclined toward the center side of the back surface cover 26. Therefore, the water of the water jet J, which is ejected from the through hole H drilled by the water jet J, hits the inner surface 62 of the back cover 26, and returns to the back surface B of the concrete structure C, is the inner surface 62 of the back cover 26 and the concrete. At the boundary of the structure C with the back surface B, the inclined surface 64 of the inner surface 62 of the back surface cover 26 inclined toward the center side of the back surface cover 26 guides the back cover 26 to the center side and follows the back surface B of the concrete structure C. It is possible to prevent the rubber seal from being sealed or damaged due to the outward flow of the back cover 26. Therefore, the water of the water jet J, which is ejected from the through hole H drilled by the water jet J, hits the inner surface 62 of the back surface cover 26, and returns to the back surface B of the concrete structure C, is the inner surface 62 of the back surface cover 26 and the concrete. Near the boundary of the back surface B of the structure C, it hits the back surface B of the concrete structure C at an angle close to vertical, and the rubber seal is sealed by the outward flow of the back surface cover 26 along the back surface B of the concrete structure C. It is possible to prevent deterioration of sex and damage.

Further, according to the present embodiment, the inside of the back surface cover 26 is dried by injecting a gas such as nitrogen gas from the slurry discharge air nozzle 60 into the back surface cover 26 by the slurry discharge air nozzle 60, and the back surface cover 26 is dried. Residues inside can be removed.

Hereinafter, a second embodiment of the present invention will be described. As shown in FIG. 10, in the present embodiment, the water jet system 1 includes a forward / backward moving rail 6 capable of moving the water nozzle head 10 forward / backward with respect to the concrete structure C, as in the first embodiment. The rod support portion 7 has an air motor 65 driven by air supply from the air supply line 13a. The rod support portion 7 is attached to a slide block 66 capable of sliding the forward / backward rail 6. The swivel shaft 8, the rod 9, and the water nozzle head 10 can move forward and backward with respect to the concrete structure C by the rod support portion 7 attached to the slide block 66 in which the forward / backward movement rail 6 can be slidable.

The forward / backward rail 6 is integrated with the recovery cover 11b by a base 67 attached to the recovery cover 11b similar to the recovery cover 11a of the first embodiment, and the surface S of the concrete structure C is integrated with the recovery cover 11b. Can be attached to. Others are the same as those in the first embodiment.

According to the present embodiment, the forward / backward moving rail 6 capable of moving the water nozzle head 10 forward / backward with respect to the concrete structure C is integrated with the recovery cover 11b, and is formed on the surface S of the concrete structure C via the recovery cover 11b. Since it is attached, the position where the hole is drilled can be moved with the water nozzle head 10, the forward / backward rail 6 and the recovery cover 11b integrated, and the moving time can be shortened. Further, the weight can be reduced by reducing the number of parts attached to the surface S of the concrete structure C.

Hereinafter, a third embodiment of the present invention will be described. As shown in FIGS. 11A and 11B, the recovery cover 11c is on the side of the surface S of the concrete structure C at a portion where the surface S of the concrete structure C and the inner surface of the recovery cover 11c face each other. It has a rotatable outer disk 68 around a central axis 69 facing.

On the side of the concrete structure C opposite to the side of the surface S, the outer disk 68 includes an annular ring rail 70 at the peripheral edge of the outer surface thereof. The central axis 69 intersects the center of the ring rail 70. On the side of the concrete structure C opposite to the side of the surface S, the recovery cover 11c has eight guide wheels 71 arranged at equal intervals on the peripheral edge of the outer surface thereof. The outer disk 68 is rotated around the central axis 69 by the guide wheel 71 that rotates smoothly while fitting with the ring rail 70. The boundary between the outer wall of the recovery cover 11c and the outer disk 68 is sealed by a V-shaped end face seal 72 and an auxiliary O-ring 73.

The recovery cover 11c is arranged inside the outer disk 68 at a portion where the surface S of the concrete structure C and the inner surface of the recovery cover 11c face each other, and the recovery cover 11c of the outer disk 68 faces the side of the surface S of the concrete structure C. It has a rotatable inner disk 74 around a central axis 75 separated from the central axis 69.

On the side of the concrete structure C opposite to the side of the surface S, the inner disk 74 has three guide wheels 76 arranged at equal intervals on the peripheral edge of the outer surface thereof. On the side of the concrete structure C opposite to the side of the surface S, the outer disk 68 includes an annular ring rail 77 inside the ring rail 70 on its outer surface. The central axis 75 intersects the center of the ring rail 77. A guide wheel 76 that rotates smoothly while fitting with the ring rail 77 causes the inner disk 74 to rotate around the central axis 75. The boundary between the outer disk 68 and the inner disk 74 is sealed by a V-shaped end face seal 72 and an auxiliary O-ring 73.

The inner disk 74 includes a rod through hole 29 similar to that of the first embodiment at a position separated from the central axis 75 of the inner disk 74. Therefore, the water nozzle head 10 is arranged on the inner disk 74 so as to inject the water jet J onto the concrete structure C from a position separated from the central axis 75 of the inner disk 74. Others are the same as those in the first embodiment or the second embodiment.

In the present embodiment, the recovery cover 11c is rotatable around a central axis 69 facing the surface S of the concrete structure C at a portion where the surface S of the concrete structure C and the inner surface of the recovery cover 11c face each other. The outer disk 68 and the inner disk 74 which is arranged inside the outer disk 68 and is rotatable around the central axis 75 separated from the central axis 69 of the outer disk 68 while facing the surface S side of the concrete structure C. The water nozzle head 10 is arranged on the inner disk 74 so as to inject the water jet J onto the concrete structure C from a position separated from the central axis 75 of the inner disk 74. Therefore, the position where the water nozzle head 10 ejects the water jet J can be changed by rotating the outer disk 68 and the inner disk 74 as necessary. Therefore, for example, when the existence of a buried object such as a reinforcing bar of the concrete structure C is found after the drilling is started, the position of the drilling is determined while the recovery cover 11c is attached to the surface S of the concrete structure C. Can be changed. Further, a large through hole can be drilled by continuously drilling a plurality of through holes so that the peripheral portions thereof overlap each other. Therefore, workability can be improved.

Hereinafter, a fourth embodiment of the present invention will be described. As shown in FIGS. 12A and 12B, in the present embodiment, in the recovery cover 11d having substantially the same configuration as the recovery cover 11c of the third embodiment, the inner disk 74 is a concrete structure. The water nozzle head 10 that injects the water jet J into the C and the abrasive nozzle head 78 that injects the abrasive jet into the concrete structure C are exchanged and arranged.

The recovery cover 11d has a constant speed rotation drive unit 79 that rotates the outer disk 68 at a constant speed. The constant speed rotation drive unit 79 is, for example, an electric motor that can be operated at an arbitrary constant speed rotation speed. A pinion gear 80 is attached to the rotation shaft of the constant speed rotation drive unit 79. On the side of the concrete structure C opposite to the side of the surface S, the outer disk 68 includes a circular tubular internal gear 82 supported by an internal gear support column 81 on the upper surface of the ring rail 70. The central shaft 69 intersects the center of the internal gear 82. The outer disk 68 is rotated at a constant speed by engaging the pinion gear 80 and the internal gear 82 rotated at a constant speed by the constant speed rotation drive unit 79.

In the present embodiment, the inner disk 74 is replaced by a water nozzle head 10 that injects a water jet J into the concrete structure C and an abrasive nozzle head 78 that injects an abrasive jet into the concrete structure C. Since the outer disk 68 is rotated at a constant speed by the constant speed rotation drive unit 79, the entire system is replaced, for example, when the presence of the reinforcing bar of the concrete structure C is found after the drilling is started. Even if this is not done, the water nozzle head 10 is replaced with the abrasive nozzle head 78, and after the inner disk 74 on which the abrasive nozzle head 78 is arranged is rotated to an arbitrary position and then fixed, the abrasive nozzle head By rotating the outer disk 68 at a constant speed while injecting an abrasive jet from the 78, it is possible to cut the reinforcing bars existing at various positions. In addition, the reinforcing bar can be cut even in a situation where the use of firearms such as a melting device is restricted.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and is implemented in various forms.

1 ... water jet system, 2 ... water tank, 3 ... high pressure pump, 4 ... water supply line, 5 ... base, 6 ... forward / backward rail, 7 ... rod support, 8 ... swivel shaft, 9 ... rod, 10 ... water nozzle Head, 11a, 11b, 11c, 11d ... Recovery cover, 12 ... Compressor, 13a, 13b, 13c ... Air supply line, 14, 14a, 14b ... Air supply port, 15, 15a, 15b ... Discharge port, 16 ... Discharge line , 17 ... Stop control unit, 18 ... Water receiving tank, 19 ... Cyclone, 20 ... Exhaust line, 21 ... Suction unit, 22 ... Drainage line, 23 ... Drainage tube pump, 24 ... Sedimentation tank, 25 ... Treatment tank, 26 ... Back cover, 27 ... inner pipe, 28 ... outer pipe, 29 ... rod through hole, 30 ... purge line connection port, 31 ... fixture, 32 ... anchor, 33 ... opening, 34 ... opening, 35 ... recovery cover internal pressure detection port , 36 ... Recovery cover internal pressure detection unit, 37 ... Inner compartment, 38 ... Outer compartment, 39 ... Vacuum lead port, 40 ... Outer compartment internal pressure detection unit, 41 ... Outer compartment internal pressure detection unit, 42a, 42b ... Flange, 43 ... Hard rubber , 44 ... sponge rubber, 45 ... ring, 46 ... connection part, 47 ... connection part, 48 ... outer flange, 49 ... outer pipe connection piece, 50 ... radial bearing, 51 ... bearing stop piece, 52 ... rod air air supply port, 53 ... Anti-vibration and diffusion injection ring, 54 ... Bolt band, 55 ... Discharge line connection port, 56 ... Exhaust line connection port, 57 ... Cyclone packing, 58 ... Drain line connection port, 59 ... Spare port, 60 ... Slurry discharge Air nozzle, 61 ... Slurry outlet, 62 ... Inner surface, 63 ... Opening, 64 ... Inclined surface, 65 ... Air motor, 66 ... Slide block, 67 ... Base, 68 ... Outer disk, 69 ... Central axis, 70 ... Ring rail, 71 ... Guide wheel, 72 ... V-shaped end face seal, 73 ... O ring, 74 ... Inner disk, 75 ... Central axis, 76 ... Guide wheel, 77 ... Ring rail, 78 ... Abrasive nozzle head, 79 ... Constant speed Rotary drive unit, 80 ... pinion gear, 81 ... internal gear support column, 82 ... internal gear, C ... concrete structure, J ... water jet, S ... front surface, B ... back surface, F ... swirling flow, A ... gas, M ... center, h ... hole, H ... through hole, W ... muddy water, T ... processing waste.

Claims (13)

A water nozzle head that injects a water jet into a concrete structure,
A recovery cover that collects water from the water jet sprayed from the water nozzle head onto the concrete structure while covering the surface of the concrete structure and the water nozzle head so as to seal the water nozzle head.
With
The recovery cover is
An air supply port connected to an air supply line that supplies gas,
A discharge port connected to a discharge line for discharging the gas supplied from the air supply line through the air supply port, and
Have a,
The air supply port supplies gas to the inside of the recovery cover by injecting gas supplied from the air supply line into the inside of the recovery cover in a direction deviated from the center of the inside of the recovery cover. A water jet system that generates a swirling flow of gas supplied from an air line through the air supply port . A water nozzle head that injects a water jet into a concrete structure,
A recovery cover that collects water from the water jet sprayed from the water nozzle head onto the concrete structure while covering the surface of the concrete structure and the water nozzle head so as to seal the water nozzle head.
With
The recovery cover is
An air supply port connected to an air supply line that supplies gas,
A discharge port connected to a discharge line for discharging the gas supplied from the air supply line through the air supply port, and
Have a,
The recovery cover is
It further has a recovery cover internal pressure detecting unit for detecting the internal pressure of the recovery cover.
When the recovery cover internal pressure detecting unit detects an increase in the internal pressure of the recovery cover, the water jet is ejected from the water nozzle head and gas is supplied from the air supply line through the air supply port. A water jet system that further includes a stop control unit that stops . The recovery cover is
An inner compartment that seals the water nozzle head and the surface of the concrete structure facing the water nozzle head.
An outer compartment that seals the surface of the concrete structure outside the inner compartment,
An outer compartment internal pressure detecting unit that detects the internal pressure of the outer compartment,
Have more
The stop control unit
When the outer compartment internal pressure detecting unit detects an increase in the internal pressure of the outer compartment, the water jet is ejected from the water nozzle head and the gas is supplied from the air supply line through the air supply port. The water jet system according to claim 2 , wherein the water jet system is stopped. The water jet system according to claim 3 , wherein the recovery cover further includes an outer compartment decompression portion that creates a negative pressure inside the outer compartment. A water nozzle head that injects a water jet into a concrete structure,
A recovery cover that collects water from the water jet sprayed from the water nozzle head onto the concrete structure while covering the surface of the concrete structure and the water nozzle head so as to seal the water nozzle head.
With
The recovery cover is
An air supply port connected to an air supply line that supplies gas,
A discharge port connected to a discharge line for discharging the gas supplied from the air supply line through the air supply port, and
Have a,
On the back surface of the concrete structure opposite to the front surface, a back surface cover is further provided to cover the through holes drilled by the water jet so as to seal the holes.
A water jet system in which the inner surface of the back cover has an inclined surface inclined toward the center side of the back cover at a boundary between the inner surface of the back cover and the back surface of the concrete structure . The water jet system according to claim 5 , wherein the back cover has an air nozzle that injects gas into the inside of the back cover toward the inside of the back cover. A water nozzle head that injects a water jet into a concrete structure,
A recovery cover that collects water from the water jet sprayed from the water nozzle head onto the concrete structure while covering the surface of the concrete structure and the water nozzle head so as to seal the water nozzle head.
With
The recovery cover is
An air supply port connected to an air supply line that supplies gas,
A discharge port connected to a discharge line for discharging the gas supplied from the air supply line through the air supply port, and
Have a,
The water nozzle head is further provided with a forward / backward moving rail capable of moving back and forth with respect to the concrete structure.
A water jet system in which the forward / backward rail is integrated with the recovery cover and attached to the surface of the concrete structure via the recovery cover . A water nozzle head that injects a water jet into a concrete structure,
A recovery cover for collecting the water of the water jet sprayed from the water nozzle head onto the concrete structure while covering the surface of the concrete structure and the water nozzle head so as to seal the water nozzle head.
With
The recovery cover is
An air supply port connected to an air supply line that supplies gas,
A discharge port connected to a discharge line for discharging the gas supplied from the air supply line through the air supply port, and
Have a,
The recovery cover is provided at a portion where the surface of the concrete structure and the inner surface of the recovery cover face each other.
An outer disk that is rotatable around a central axis facing the surface of the concrete structure,
An inner disk that is located inside the outer disk and is rotatable around a central axis that is oriented towards the surface of the concrete structure and separated from the central axis of the outer disk.
Have,
A water jet system in which the water nozzle head is arranged on the inner disk so as to inject the water jet onto the concrete structure from a position separated from the central axis of the inner disk . The inner disk is arranged so that the water nozzle head that ejects the water jet onto the concrete structure and the abrasive nozzle head that ejects the abrasive jet onto the concrete structure are interchanged.
The water jet system according to claim 8 , wherein the recovery cover further includes a constant speed rotation drive unit that rotates the outer disk at a constant speed. The water jet system according to any one of claims 1 to 9, wherein the discharge line is connected to a suction portion that generates a negative pressure inside the recovery cover. Any one of claims 1 to 10 , wherein the recovery cover has a plurality of outlets for recovering the gas supplied from the air supply line through the air supply port and the water of the water jet. The water jet system described in the section. At least one of the plurality of outlets is arranged so as to open in a direction different from the direction in which the gas supplied from the air supply line through the air supply port flows. The water jet system according to any one of 11 . The water nozzle head
It is connected to the tip of the inner pipe of a rod having an inner pipe and an outer pipe surrounding the inner pipe, and water of the water jet is supplied through the inside of the inner pipe of the rod.
The rod
The invention according to any one of claims 1 to 12 , wherein the gas supplied through the inner pipe and the outer pipe is ejected from between the tip of the inner pipe and the tip of the outer pipe. Water jet system.

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