JP5666501B2 - Decontamination method and surface treatment apparatus usable in the method - Google Patents

Description

  The present invention sucks while spraying high-pressure treated water on the treated surface (road surface) of interlocking, asphalt, concrete, resin pavement, stone pavement, etc., and removes radioactive substances adhering to the treated surface, The present invention relates to a decontamination treatment method for reducing the cpm value of a treated surface and a surface treatment apparatus usable for the method, and in particular, it can be used for a decontamination treatment method and method capable of treating the surface of the treated surface with minimal peeling and damage. The present invention relates to a surface treatment apparatus.

  Conventionally, in a road surface treatment apparatus, a rotary sprayer that is rotated by arranging a number of injection nozzles that inject high-pressure treated water is surrounded by a housing, and treated water and treated surface deposits are mixed together. There is one in which suction means capable of sucking the combined sewage is connected to the housing (see, for example, Patent Documents 1 and 2).

  In addition, a rotary sprayer that can be rotated by arranging a large number of spray nozzles that spray high-pressure treated water is configured to be surrounded by a housing, and the treated water and treated surface deposits after treatment are mixed. There has also been a surface treatment apparatus in which suction means capable of sucking sewage is disposed in the vicinity of the rear of the moving housing (see Patent Document 3). In this surface treatment apparatus, the rotary spray body is configured by arranging a plurality of nozzle arms, each having a predetermined number of spray nozzles for spraying high-pressure treated water, so as to extend radially from the center of rotation. As the state along the processing surface, the processing surface was processed by spraying the processing water from the spray nozzle while rotating the nozzle arm.

JP 2003-94394 A JP-A-6-264422 Japanese Patent Laid-Open No. 10-114909

  However, all of the conventional surface treatment apparatuses rub (shave) the surface of the treated surface by the impact caused by the pressure of the treated water sprayed at a high pressure, and peel off the deteriorated portion of the concrete that becomes the treated surface. The rubber adhering to the runway serving as the treatment surface was removed, or the mortar material serving as the treatment surface was shaved, and none of the treatments were performed while suppressing the shaving of the surface of the treatment surface. Of course, a surface treatment apparatus for decontamination of radioactive substances that cannot be visually observed has not been known.

  Therefore, in the conventional apparatus, it is possible to perform processing while suppressing the surface of the treatment surface from being shaved so as to be suitable for decontamination, and easy post-treatment of sewage in which treated water and treated surface deposits are mixed. Thus, there is a problem in that the amount of treated water to be used is effectively reduced and treated.

  In particular, when radioactive materials are attached to the treated surface, if the treated surface is sharply cut, it becomes necessary to reconstruct the road surface again, which is undesirable, and the wastewater itself may contain radioactive materials. Inevitably, it is important to effectively treat the amount of treated water used.

  The present invention solves the above-mentioned problem, suppresses the surface of the processing surface, can effectively decontaminate the processing surface, and can reduce the amount of processing water used, It is an object of the present invention to provide a decontamination method that facilitates post-treatment of collected sewage and a surface treatment device used in the method.

<Explanation of Claim 1>
A decontamination treatment method that reduces the cpm value of a treated surface by spraying high-pressure treated water onto the treated surface to which a radioactive substance is attached,
A plurality of spray nozzles each having a discharge amount of 0.2 to 3.5 liters / min, with the discharge pressure of treated water being in the range of 100 to 280 Mpa,
A rotary sprayer that is rotatable by arranging a plurality of the spray nozzles and spraying from each of the spray nozzles, with the rotating surface aligned with the processing surface.
A housing that rotatably supports the rotary sprayer, extends to the vicinity of the processing surface, and covers the periphery of the rotary sprayer;
A suction means connected to the housing and capable of sucking sewage mixed with treated water and treated surface deposits;
And using a surface treatment device with
The injection nozzle, the water supply amount of the treated water of the whole rotating spraying body and the number of use in a range of less 20 l / min, and the rotation locus of the injection nozzle during rotation of the rotating spraying body Arranged on the rotating sprayer so as to be shifted from each other,
The suction means is operated so that the distance between each spray nozzle and the treatment surface is within a range of 5 to 20 mm, and treated water is ejected from each spray nozzle with a discharge pressure of 100 to 280 MPa, while the rotation is performed. It is characterized in that it is carried out while rotating the ejector and moving the housing along the processing surface.

  In the decontamination processing method according to the present invention, from a plurality of injection nozzles having an opening diameter in which a discharge amount is in a range of 0.2 to 3.5 liters / min when a discharge pressure is in a range of 100 to 280 MPa, Rotating the rotating sprayer while discharging the treated water onto the processing surface at a discharge pressure of ˜280 Mpa, moving the housing supporting the rotating sprayer along the processing surface, and further operating the suction means Thus, the decontamination work is performed by sucking the sewage mixed with the treated water and the treated surface adhering matter.

  Since such treatment water injection has a discharge amount from each injection nozzle within a small amount of 0.2 to 3.5 liters / min even at a high pressure within a range of 100 to 280 Mpa, The treated water can be made to collide with the treated surface in the form of a small-diameter needle-like (hair-like) water column. For this reason, such treatment water injection can suppress peeling (scraping) of the treatment surface, and can peel off the adhered matter to which the radioactive substance has adhered, from the treatment surface.

  That is, in the decontamination processing method of the present invention, water such as tap water can be used as processing water instead of using shot blasting, sand blasting, and polishing machines that use steel balls. By the impact force, the deposits with radioactive substances on the treated surface can be finely divided, and the deposits that have become finely divided into fine particles are wetted with mist-like treated water or wrapped with water for suction. The fluid can be sucked by the means. Once the particulate fluid containing the radioactive substance is obtained, it is quickly sucked by the suction means, so that the radioactive substance deposits and sewage are not leaked out of the housing, that is, radiated again to the treatment surface. The treated surface can be efficiently decontaminated without adhering active substances.

  In addition, if the amount of treated water supplied to the entire rotary spray body is 20 liters / min or less and the discharge amount from each spray nozzle is 0.2 to 3.5 liters / min, suction is performed by the suction means. The capacity of sewage after treatment can be reduced as much as possible, and the burden of post-treatment can be reduced.

  If the discharge rate from each injection nozzle under high pressure is less than 0.2 liter / min, the amount of water supply can be reduced, but the impact force of the treated water is reduced and the deposits are separated from the treated surface. It becomes difficult and it is difficult to secure the treatment effect. If it exceeds 3.5 liters / min, the total amount of water supply simply increases, the treatment effect cannot be improved, and the volume of sewage after treatment increases. Therefore, the discharge amount from each injection nozzle under high pressure is 0.2 to 3.5 liter / min, preferably 0.2 to 1.0 liter / min. desirable. Furthermore, if the amount of treated water supplied to the entire rotary sprayer exceeds 20 liters / min, the volume of sewage to be collected increases, which places a burden on post-processing.

  Also, if the distance from the treatment surface of the spray nozzle is less than 5 mm, the spray nozzle is likely to be damaged if the treatment surface is uneven, and if it exceeds 20 mm, the impact force immediately before the treated water reaches the treatment surface. The distance between the spray nozzle and the treatment surface is within a range of 5 to 20 mm, and preferably within a range of 5 to 10 mm. It is desirable.

Further, the injection nozzle is used in a number within the range where the water supply amount of the entire rotary sprayer is 20 liters / min or less, and the rotation trajectory of the spray nozzle during the rotation of the rotary sprayer is shifted from each other. It arrange | positions at the rotary injection body so that it may be set. Therefore, it is possible to eliminate the processing surface scraping and eliminate the need for processing to restore the processing surface after construction, and the amount of processing water used is also suppressed, making it easy to post-process recovered sewage. It becomes.

<Explanation of Claim 2>
In the decontamination processing method according to the present invention, it is desirable that the discharge pressure of the processing water from each spray nozzle be in the range of 125 to 225 MPa.

  In such a method, the processing surface may be cut by about 1 to 2 mm, but it is in a range where construction for restoration is unnecessary, and the processing surface can be suitably decontaminated. On the contrary, since the surface of the processing surface can be cut evenly and thinly, it can be cleaned cleanly, the predetermined frictional resistance can be recovered, and the function as a road surface can be improved.

<Explanation of Claim 3>
Or in the decontamination processing method which concerns on this invention, it is good also considering the discharge pressure of the treated water from each injection nozzle as the range of 100 Mpa or more and less than 125 Mpa.

  In such a method, when a radioactive substance is attached to the exposed surface of the processing surface, decontamination can be performed without cutting the processing surface, which is preferable. In other words, such a decontamination treatment method is suitable for a treated surface such as a resin pavement or a rubber pavement in which a radioactive substance does not easily enter inside and easily adheres to the surface.

<Explanation of Claim 4>
In the decontamination processing method according to the present invention, it is desirable that the amount of treated water supplied to the entire rotary spray body is within a range of 6 to 12 liters / min.

  In such a method, the amount of treated sewage sucked by the suction means becomes small and the post-treatment becomes easy. Further, the collection tank for collecting the sewage and performing the post-treatment, or the radioactive material in the sewage A treatment tank for separating and filtering the kimono can be made compact, and post-treatment can be performed at the decontamination site, so that decontamination processing can be performed quickly.

<Explanation of Claim 5>
Furthermore, in the decontamination processing method according to the present invention, at least a part of the treated water is a supernatant liquid after the sewage sucked by the suction means is subjected to a precipitation treatment using a flocculant and a filtration treatment. It is desirable to use it.

  In such a method, wastewater can be reused as treated water, preparation of new treated water at the decontamination site and reduction of the amount of contaminated waste can be reduced, and decontamination work at the site can be performed efficiently. Can do.

<Explanation of Claim 6>
The surface treatment apparatus according to the present invention is a surface treatment apparatus that can be used in a decontamination treatment method that reduces the cpm value of a treatment surface by injecting high-pressure treated water onto the treatment surface to which a radioactive substance is attached. ,
The nozzle arm, in which a predetermined number of injection nozzles for injecting high-pressure treated water are arranged, is arranged so as to extend radially from the center of rotation, and the nozzle is in a state where the rotation surface is along the treatment surface. A rotating sprayer capable of treating the treated surface by causing the treated water to be ejected from the ejection nozzle while rotating the arm;
A housing that rotatably supports the rotary sprayer and covers the periphery of the rotary sprayer;
A suction means connected to the housing and capable of sucking sewage mixed with treated water and treated surface deposits;
A wheel that supports the housing and allows the rotary sprayer and the housing to move along the processing surface;
With
A plurality of the injection nozzles,
The discharge pressure is set within a range of 100 to 280 Mpa, and each is configured as a discharge amount of 0.2 to 3.5 liters / min.
The rotation trajectory of the injection nozzle when the rotary injection body is rotated in a state where the movement of the housing is stopped is set to a large number of radial dimensional differences within a range of 2.3 to 4.8 mm from the rotation center. Concentric arcs, and
So that the distance to the treatment surface is within a range of 5 to 20 mm,
It is characterized by being arranged.

  In the surface treatment apparatus according to the present invention, the treatment water sprayed from the spray nozzles has a discharge pressure within a range of 100 to 280 Mpa, and a discharge amount from each spray nozzle within a range of 0.2 to 3.5 liters / min. In addition, the treatment water is jetted from each jet nozzle with the distance to the treatment surface being in the range of 5 to 20 mm.

  As described above, the injection of the treated water is performed by setting the discharge amount from each injection nozzle within a small range of 0.2 to 3.5 liters / min even at a high pressure within the range of 100 to 280 Mpa. Therefore, the treated water can be made to collide with the treated surface as a water column with a small diameter needle shape (hair shape) as much as possible. For this reason, such treatment water injection can suppress peeling (scraping) of the treatment surface, and can peel off the adhered matter to which the radioactive substance has adhered, from the treatment surface.

  In addition, as described above, if the discharge amount from each spray nozzle is 0.2 to 3.5 liter / min, the capacity of the treated sewage sucked by the suction means can be reduced as much as possible.

  As described above, the discharge amount from each injection nozzle under high pressure is less than 0.2 liter / min, and it is difficult to ensure the treatment effect. Simply increasing the amount of water supply does not improve the treatment effect and increases the capacity of sewage after treatment, which is undesirable. Therefore, the discharge amount from each injection nozzle under high pressure is 0. It is desired to be in the range of 2 to 3.5 liter / min, desirably 0.2 to 1.0 liter / min.

  In addition, as described above, if the distance from the treatment surface of the injection nozzle is less than 5 mm, the injection nozzle is easily damaged when the treatment surface is uneven, and if it exceeds 20 mm, the treated water is applied to the treatment surface. The distance from the treatment surface of the injection nozzle is in the range of 5 to 20 mm, preferably 5 to 5 because the treatment effect is reduced just before reaching the mist that reduces the impact force. It is desirable to be within the range of 10 mm.

  Furthermore, in the surface treatment apparatus according to the present invention, spray nozzles for spraying treated water in the form of thin needles are arranged on a plurality of nozzle arms and rotate, and the rotation locus from the rotation center at that time is 2. A large number of concentric arcs having a radial dimension difference (also referred to as a pitch) within a range of 3 to 4.8 mm, while rotating the rotating spray body by spraying treated water from each spray nozzle, As long as it is moved, the needle-shaped treated water that is evenly intimately sprayed can be spirally ejected as much as possible, and the discharge amount from each spray nozzle can be reduced to 0.2 to 3.5 liters / min. However, the processing surface can be processed efficiently.

  If the pitch (radial dimension difference) of the rotation trajectory is less than 2.3 mm, the injection nozzles that inject the treated water at a high pressure are too close to each other, leading to a decrease in the strength of the nozzle arm and the like. It is difficult to place on the arm, and if it exceeds 4.8 mm, there is a gap in the trajectory on the processing surface, and it becomes difficult to apply the treated water sprayed from the spray nozzle evenly over the entire processing surface. The pitch is 2.3 to 4.8 mm, preferably 2.5 to 3.3 mm.

<Explanation of Claim 7>
In the surface treatment apparatus according to the present invention, the above-described discharge pressure is in the range of 100 to 280 Mpa, and the injection nozzle having a discharge amount of 0.2 to 3.5 liters / min is an injection port for injecting treated water. In terms of the opening diameter, a diameter within the range of 0.07 to 0.4 mm is suitable.

<Explanation of Claim 8>
In the surface treatment apparatus according to the present invention, the rotary spray body is:
The total amount of treated water supplied is in the range of 6 to 20 liters / min.
The nozzle arm is within a range of 4 to 8 in which the length from the rotation center is approximately 150 mm, and is arranged radially evenly from the rotation center.
The spray nozzles arranged in one nozzle arm are configured as 5 or less, and
Each injection nozzle is set so that the rotation trajectory of the injection nozzle when the rotary injection body is rotated in a state where the movement of the housing is stopped is an arc within a range of 20 to 40 concentric. It is desirable to arrange.

  With such a configuration, it is possible to suitably form the rotary sprayer within a practical range.

  That is, in the surface treatment apparatus according to the present invention, even if the discharge amount of each injection nozzle within the range of 100 to 280 Mpa is 0.2 to 3.5 liter / min, the total amount of treated water supplied is If it is in the range of 6 to 20 liters / min, the amount of treated sewage sucked by the suction means becomes small and post-treatment becomes easy.

  In addition, as described above, if the water supply amount of the entire treated water of the rotary sprayer is less than 6 liters / min, it becomes difficult to secure the discharge amount from each spray nozzle in a state where the treatment effect is secured, If it exceeds 20 liters / min, the volume of collected sewage increases, and post-treatment is burdened. Therefore, the total amount of treated water supplied is 6-20 liters / min, preferably 6-12. A range of liter / min is desirable.

  And the amount of treated water supplied to the entire rotary sprayer is set within a range of 6 to 20 liters / min, and each of the discharge amounts is set within a range of 0.2 to 3.5 liters / min. The total number of cases is 40, the number of injection nozzles is 40 or less, and the rotation locus of each injection nozzle is 40 or less concentric corresponding to the number of injection nozzles used.

  Further, if the number of nozzle arms of the rotating spray body is 4 to 8 and the number of spray nozzles in each nozzle arm is 5 or less, the length dimension from the rotation center of each nozzle arm is set to a compact size of about 150 mm. However, even if the pitch of the rotation trajectory of the injection nozzle is within the range of 2.3 to 4.8 mm so that the treatment surface can be covered closely, the flow path of the high-pressure treatment water in the nozzle arm can be easily obtained. Each injection nozzle can be arranged while securing an arrangement space for strength and rotation structure.

  That is, first, if the number of nozzle arms of the rotary spray body is 8 (5 to 8) and the number of spray nozzles in each nozzle arm is 5 or less, the rotational trajectories of many spray nozzles are concentric. Each injection nozzle can be easily arranged in a typical maximum of 40 nozzles.

  And even if the length dimension from the rotation center of each nozzle arm is about 150 mm which is compact, if the strength of the flow path of high-pressure treated water in each nozzle arm and the arrangement space of the rotation structure are taken into consideration, the arrangement space is Each nozzle arm is an area having a width dimension of about 90 mm in the radial direction. Even in such an area, a maximum of five spray nozzles can be easily arranged.

  Therefore, the pitch of the rotation trajectories between the injection nozzles is set within the range of 2.3 to 4.8 mm so that the processing surface can be covered closely, and the rotation trajectories of many injection nozzles are 40 or less concentric. However, a predetermined pitch is provided while a predetermined number of injection nozzles are arranged within a range of a width dimension along the radial direction of about 90 mm that can be secured as an installation space within a length dimension of about 150 mm of the nozzle arm. Thus, the rotary injector can be configured to ensure a large number of arcuate rotation trajectories, and the rotary injector can be configured compactly.

  As the rotation trajectory of many injection nozzles, if 20 or more concentric arcs can be arranged, a high pressure within the range of the width dimension in the radial direction of about 90 mm in each nozzle arm is set. Even with a configuration in which five nozzles, five or less, for spraying the treated water are arranged and the minimum number of nozzle arms is four, the spray nozzle can be easily covered so that the processing surface can be covered closely. The pitch (radial dimension difference) of the rotation trajectory can be in the range of 2.3 to 4.8 mm. If the rotational trajectory is configured to have 19 or less concentric arcs, the pitch of the rotational trajectory of the injection nozzle exceeds 4.8 mm, and the treatment water sprayed from the injection nozzle on the treatment surface The gap between the trajectories increases and the processing effect decreases.

  If the number of nozzle arms is three or less, 20 arcs can be secured as the rotation trajectory of each injection nozzle when the housing is stationary even if five injection nozzles are provided in each nozzle arm. In addition, with nine or more nozzles, the nozzle arms are too close to each other, making it difficult for the negative pressure of the suction means to act near the rotation center of the rotary ejector (in other words, each nozzle arm itself is connected to the blower). This makes it difficult to act like a fan of this type), and there is a risk that the treated sewage will be left on the treated surface. This will affect the strength of the body support structure. Therefore, the number of nozzle arms is 4 to 8, preferably 5 to 8.

<Explanation of Claim 9>
And in the surface treatment apparatus which concerns on this invention, the said rotation injection body makes equal the pitch of the rotation locus | trajectory of the said injection nozzle when rotating the said rotation injection body in the state which stopped the movement of the said housing. As described above, it is desirable to dispose each of the injection nozzles.

  In such a configuration, if the treated water is sprayed from each spray nozzle of the rotating spray body that rotates while being moved, the treated water can be applied to the treated surface more evenly and processed efficiently. Can do.

<Explanation of Claim 10>
Furthermore, in the surface treatment apparatus according to the present invention, each of the spray nozzles has an arc trajectory that does not overlap another arc when the rotary spray body is rotated in a state where the movement of the housing is stopped. It is desirable to arrange it.

  In such a configuration, the injection nozzles for injecting the treated water rotate so as to draw a trajectory of a circular arc (a spiral shape if moved) without overlapping each other, and therefore, more evenly. The treated water can be applied to the treated surface, and the treated water can be effectively treated while suppressing the shaving of the treated surface.

<Explanation of Claim 11>
Furthermore, in the surface treatment apparatus according to the present invention, a plurality of types of ejection nozzles with different ejection amounts may be used. In this case, the ejection nozzle that increases the ejection amount The rotation trajectory of each of the injection nozzles when the rotary injection body is rotated with the movement of the housing being stopped from the injection nozzle to reduce the diameter of the injection nozzle so as to form an outer arc away from the rotation center. It is desirable to arrange.

  In such a configuration, the injection nozzle whose outer side of the arc of rotation is on the outer side is arranged on the tip side of the nozzle arm away from the center of rotation, and the moving speed and movement in the rotation direction are higher than those of the inner injection nozzle. The amount will increase. Therefore, if the discharge amount of the outer injection nozzle away from the rotation center is made larger than the discharge amount of the inner injection nozzle, the discharge amount of the treated water per unit length of the arc of each rotation locus is as uniform as possible. Can be

  As a result, it is possible to equalize the pressure (capacity / impact force) of the treated water on each part of the treated surface of the rotating sprayer per rotation, eliminating the influence of the disposition distance of the spray nozzle from the rotation center, Furthermore, it can process effectively, suppressing the cutting of the processing surface.

<Explanation of Claim 12>
In the surface treatment apparatus according to the present invention, the housing is
While providing and configuring a ceiling wall part covering the upper side of the rotary sprayer and a peripheral wall part covering the circumference of the rotary sprayer over the entire circumference,
At the lower end of the peripheral wall portion, a cylindrical sealing material that can be bent while the lower end is in contact with the processing surface is disposed, and configured.
The sealing material includes an outer brush layer on the outer peripheral side and a inner brush layer on the inner peripheral side, each of which has a cylindrical shape by bundling flexible wires with the lower end as a free end. Configured
It is desirable that the outer brush layer be configured by making the length of the wire longer and lowering the bending rigidity of the wire than the inner brush layer.

  In such a configuration, it is easy to ensure a sealed state in the housing, and the suction means sucks air outside the housing through a small gap between the wire members of the outer brush layer and the inner brush layer, and after processing Dirty water mixed with treated water and treated surface deposits can be sucked smoothly without being leaked out of the housing or left on the treated surface. That is, in such a configuration, the inner brush layer having a high bending rigidity can ensure the hermeticity in the housing, and easily bends even if the tip of the inner brush layer moves away from the processing surface as the housing moves. While the outer brush layer is bent, the space between the processing surface and the inner brush layer can be closed to ensure a sealed state in the housing.

  Of course, since the sealing material is formed of a brush, even if there are protrusions such as pebbles on the processing surface, the surface processing apparatus can be moved along the processing surface by bending smoothly.

<Explanation of Claim 13>
And when the sealing material is configured by providing an outer brush layer and an inner brush layer, the inner brush layer can cover the inner surface of the outer brush layer between the outer brush layer and the inner brush layer. A rubber sheet that is longer than the inner brush layer and can be bent may be disposed.

  In such a configuration, since the rubber sheet can separate the inner brush layer and the outer brush layer, bending deformation such that the outer brush layer bends inward and enters the inner brush layer can be prevented. Therefore, the outer brush layer can be sealed smoothly over a long period of time, even if the inner brush layer is pushed upward by the protrusion on the processing surface and away from the processing surface without hindering the sealing performance of the inner brush layer. As a supplement, the space between the processing surface and the inner brush layer can be closed to ensure a sealed state in the housing.

  Of course, in such a configuration, since the rubber sheet itself can be secured in a sealed state in the housing while being bent in contact with the processing surface, it can contribute to an improvement in the sealing performance of the sealing material.

<Explanation of Claim 14>
Furthermore, in the decontamination processing method of the present invention, a decontamination processing method for reducing the cpm value of the processing surface by injecting high-pressure processing water onto the processing surface to which the radioactive substance is attached,
The suction amount of the suction means is in the range of 30 to 40 m ³ / min, the rotational speed of the rotary sprayer is in the range of 1800 to 2000 times / min, and the treated water discharge pressure is in the range of 100 to 280 Mpa, preferably In the range of 125 to 225 Mpa, the moving speed is in the range of 3 to 8 m / min.
The surface treatment apparatus according to any one of claims 5 to 12 is performed by moving the surface treatment apparatus while operating the surface treatment apparatus.

  In such a method, even if the radiation dose on the processing surface before processing is several thousand cpm, it can be set to 200 cpm or less.

<Explanation of Claim 15>
Further, even in the decontamination method in this case, at least part of the treated water uses the supernatant liquid after the sewage sucked by the suction means is subjected to a precipitation treatment using a flocculant and a filtration treatment. It is desirable to do.

  In this method, as described above, sewage can be reused as treated water, preparation of new treated water at the decontamination site and reduction of waste disposal can be reduced, and decontamination work at the site. Can be performed efficiently.

  Therefore, in the decontamination processing method according to the present invention and the surface treatment apparatus that can be used in the method, it is possible to effectively decontaminate the treatment surface while suppressing the surface scraping of the treatment surface, and to use the treatment water. The amount can be reduced, and post-treatment of collected sewage becomes easy.

It is a figure explaining the use condition of the surface treatment apparatus used for the decontamination processing method in one Embodiment of this invention. It is a schematic side view of the surface treatment apparatus of an embodiment. It is a schematic plan view of the surface treatment apparatus of an embodiment. It is a schematic partial longitudinal cross-sectional view of the surface treatment apparatus of embodiment. It is a general | schematic fragmentary longitudinal cross-section view of the rotation injection body vicinity of the surface treatment apparatus of embodiment. It is a general | schematic partial bottom view of the rotation injection body vicinity of the surface treatment apparatus of embodiment. It is a decomposition | disassembly schematic fragmentary sectional view of the rotary injection body of embodiment. It is the general | schematic fragmentary longitudinal cross-sectional view which expanded the sealing material vicinity of the housing of the surface treatment apparatus of embodiment. It is a figure explaining the rotation locus | trajectory of the injection nozzle of the rotary injection body of embodiment. It is a figure explaining the rotation locus | trajectory of the injection nozzle of the rotary injection body as a comparative example. It is a figure explaining the rotation locus | trajectory of the injection nozzle of the rotary injection body as a modification of embodiment. It is a figure explaining the rotation locus | trajectory of the injection nozzle of the rotary injection body as another modification of embodiment. It is explanatory drawing which shows the change of the space | gap between nozzle arms at the time of changing the number of the nozzle arms of a rotary injection body. It is a model figure showing the arrangement | positioning state of the injection nozzle at the time of changing the number of the nozzle arms of a rotary injection body. It is a general | schematic fragmentary longitudinal cross-section which shows the sealing material of the modification of the surface treatment apparatus of embodiment. It is a graph which shows the relationship between the opening diameter in an injection nozzle, discharge amount, and discharge pressure. It is a graph which shows the decontamination result of embodiment. It is a figure explaining the modification of the decontamination processing method of embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A surface treatment apparatus 10 used in the decontamination processing method of the embodiment processes a treatment surface 1 (decontamination treatment) as shown in FIG. In order to aspirate the sewage DW in which the processing fluid supply vehicle PC for supplying the high-pressure treated water W and air A to the treatment site and the treated water W after treatment and the deposits adhering to the treatment surface 1 are mixed. And the vacuum vehicle VC, and is used to process the processing surface 1. In addition, the surface treatment apparatus 10 of the embodiment, when a harmful radioactive substance is attached to the treatment surface 1, from the treatment surface 1, the reduction rate of the harmful substance (after the treatment with respect to the amount of the harmful substance before treatment) It can be said to be a decontamination device because it can remove harmful substances by increasing the ratio of the reduced amount of harmful substances).

  The treatment fluid supply vehicle PC can supply the treated water W to the surface treatment device 10 through the treated water supply hose HW at a maximum water supply amount of about 30 liters / min and a discharge pressure of up to 280 Mpa. The air motor 47, which will be described later, of the surface treatment apparatus 10 can be supplied with air having a pressure and capacity capable of rotating about 2000 times / min through the air supply hose HA. In the case of the embodiment, normal water such as tap water is used as the treated water W. In addition, as the treated water W, the supernatant CW after the sewage DW is subjected to a precipitation treatment using a flocculant and a filtration treatment is used.

The vacuum wheel VC is configured to be able to suck an air volume of about 40 m ³ / min from the surface treatment device 10 through the suction hose HV.

  Further, the vacuum vehicle VC according to the embodiment is equipped with a post-treatment device 90 for post-treating the sewage DW in which the treated water W after the treatment and the deposits attached to the treatment surface 1 are mixed. The post-processing device 90 includes a collection tank 91 that stores the sucked sewage DW, a storage tank 95 that can supply the processed supernatant CW to the processing fluid supply vehicle PC, and a processing tank 92. ing.

  In the treatment tank 92, a precipitation treatment using a flocculant and a filtration treatment are performed. In the embodiment, in the sedimentation process, the sewage DW from the collection tank 91 is caused to flow into the sedimentation tank 93, and first, 0.5 to 5 vol% zeolite per liter of sewage is added for about 5 to 10 minutes. Stir and adsorb the radioactive material on the zeolite. Next, let it stand for a predetermined time (about 10 minutes), and then add 500-5000 mg of calcium-based flocculant per liter of sewage and stir for about 5-10 minutes, for a predetermined time (about 10 minutes) And let stand to separate the precipitate from the initial supernatant.

  Thereafter, the initial supernatant is put into a filtration tank 94 provided with an ultrafiltration device (UF device), filtered, and allowed to flow into a storage tank 95. The UF apparatus uses a UF membrane having a molecular weight cut-off of about 10,000 to 500,000.

  Further, the supernatant liquid CW from the filtration treatment tank 94 may be passed through the activated carbon filling tank through a line between the filtration treatment tank 94 and the storage tank 95, and further filtration may be performed.

  The supernatant CW stored in the storage tank 95 has a sufficiently small radiation dose and may be drained as it is, but in the embodiment, it is reused as the treated water W. Then, the supernatant liquid CW stored in the storage tank 95 is appropriately supplied to a processing water tank (not shown) of the processing fluid supply vehicle PC.

  In addition, since the deposit and zeolite which precipitated in the precipitation processing tank 93 have a high radiation dose, it filters with a filter cloth etc., the supernatant liquid in that case returns to the collection | recovery tank 91 side, and the remaining fixed matter is a small amount. It is sealed in a separate container and transferred to a predetermined storage location so that it can be discarded.

  As shown in FIGS. 2 to 4, the surface treatment apparatus 10 is configured by assembling a housing 51 that holds a wheel 20, an operating rod 22, and a rotary sprayer 70 to a frame 12. On the upper surface of the housing 51, a supply head unit 40 for supplying the treated water W to the support shaft 65 that supports and rotates the rotary sprayer 70 and rotationally drives the support shaft 65 is disposed. .

  The frame 12 includes a left side portion 13 and a right side portion 14 disposed on the left and right along the front-rear direction, and a front side portion 15 and a rear side that connect the vicinity of both front and rear ends of the left side portion 13 and the right side portion 14 to each other. And a portion 16.

  Near the front ends of the left side portion 13 and the right side portion 14, front wheels 20a of the wheels 20 that are rotatably supported by the front bearing portions 18 (18a, 18b) are disposed. Near the rear ends of the left side portion 13 and the right side portion 14, rear wheels 20 b of wheels 20 that are rotatably supported by the rear bearing portions 19 (19 a, 19 b) are disposed. The surface treatment apparatus 10 can move along the front-rear direction on the treatment surface 1 by rolling these wheels 20 (front wheels 20a, 20a, rear wheels 20b, 20b).

  The operating rod 22 includes a support column 23 extending obliquely rearward and upward from the center of the rear side portion 16 in the left-right direction, and a grip portion 24 extending left and right at the rear end of the support column 23. When the surface treatment apparatus 10 is moved, the surface treatment apparatus 10 can be moved back and forth along the treatment surface 1 by gripping the grip portion 24 and pushing or pulling the wheel 20 to roll.

  An operation switch 25 for operating the surface treatment apparatus 10 is disposed on the grip portion 24 of the operation rod 22. The operation switch 25 switches ON / OFF of the supply of air A to the air motor 47 constituting the rotation drive unit 45 of the supply head unit 40 and switches ON / OFF of the supply of the treated water W to the supply head unit 40. Can be performed at the same time, and is constructed by assembling an air operated valve. The air operating valve and an air cylinder (not shown) that operates the switching valve 36 for the treated water W, which will be described later, are connected to an air passage (not shown) that interconnects the air operating valve and an auxiliary passage for the air A. The 30 flow paths 30a, 30b, 30c are appropriately connected. When the operation switch 25 is activated, air A is supplied to the air motor 47 of the supply head unit 40, and the switching valve 36 is connected to the treated water W. Is switched from the bypass flow path 37 side to the main flow path 38 connected to the supply head unit 40.

  The air supply hose HA extending from the processing fluid supply vehicle PC is connected to an air joint 27 provided at the right rear portion of the surface processing apparatus 10. If the operation switch 25 is turned on, the air A passes from the air joint 27 to the supply head unit 40 via the flow paths 29a, 29b, 29c, 29d in the main flow path 29 of the air flow path 28. It will flow to the continuous air hose 29e.

  3, a member 31 is a filter, a member 32 is a regulator, a member 33 is a lubricator, and a member 34 is a flow rate adjusting valve. 2 is an exhaust port for air A flowing into the air motor 47.

  Further, the treated water W extending from the treatment fluid supply vehicle PC is connected to a treated water joint 35 of a switching valve 36 provided at an intermediate portion of the column portion 23 of the operation rod 22. Then, if the operation switch 25 is operated ON, the treated water W flows to the second nipple portion 36b of the switching valve 36 by the switching operation of the switching valve 36 and is connected to the second nipple portion 36b. 38, the flow goes to the supply head portion 40. If the operation switch 25 is not turned on, the switching valve 36 does not perform the switching operation, and therefore flows to the first nipple portion 36a of the switching valve 36. It flows through the bypass duct 37 connected to the 1 nipple portion 36a and into the suction duct 63 to which the suction hose HV connected to the vacuum wheel VC is connected.

  The housing 51 includes a substantially disc-shaped ceiling wall portion 52 and a peripheral wall portion 53 extending downward in a cylindrical shape from the outer peripheral edge of the ceiling wall portion 52, and the upper surface of the ceiling wall portion 52 is formed on the upper surface of the frame 12. The left side portion 13 and the right side portion 14 are connected and fixed. Then, between the left side portion 13 and the right side portion 14 in the center of the ceiling wall portion 52, the supply head portion 40 is projected upward so as to protrude in a columnar shape, and on the front side of the peripheral wall portion 53, A suction duct 63 for connecting the suction hose HV projects upward.

  The suction duct 63 constitutes the suction means 62 that sucks the treated water W after treatment and the sewage DW mixed with the treated surface adhering together with the suction wheel VC and the suction hose HV connected to the vacuum wheel VC. . As described above, the bypass duct 37 for the treated water W is connected to the suction duct 63, and the treated water W is not treated when the treated water W is supplied to the surface treatment apparatus 10. Instead of being jetted from the rotary jet 70, it is discharged to the suction duct 63 via the switching valve 36 and the bypass flow path 37, and then recovered to the vacuum vehicle VC via the suction hose HV.

  As shown in FIG. 3, the suction duct 63 rotates in the counterclockwise direction when viewed from above (the clockwise direction when viewed from the bottom view of FIG. 6). A direction that is substantially tangent to the peripheral wall portion 53 and linearly extends in the rotational direction of the rotary ejector 70 so that the sewage DW can be efficiently sucked using the centrifugal force of the sewage DW accompanying rotation. Specifically, the suction duct 63 is provided so as to protrude obliquely from the vicinity of the right front of the peripheral wall portion 53 toward the front left direction, and the suction duct 63 extends upward after protruding forward as shown in FIG. It is configured to connect HV.

In addition, the suction performance of the suction means 62 including the vacuum vehicle VC of the embodiment is that the treated water W and the treated surface deposits after the treatment, and the minute road surface constituent material (asphalt piece removed from the treated surface 1). Unlike normal road surface treatment, the sewage DW mixed with concrete pieces or the like is set according to the amount of treated water W so that it can be sucked without remaining on the treatment surface 1. . Incidentally, in the embodiment, it is assumed that the air volume of about 40 m ³ / min can be sucked, but it may be high performance of 100 to 200 m ³ / min. However, even if the suction performance is improved, there is not much difference in the decontamination performance.

  Further, as shown in FIGS. 5 and 8, a cylindrical sealing material 55 that can be bent while the lower end 55 a is in contact with the processing surface 1 is attached to the outer periphery of the lower end of the peripheral wall portion 53 by fixing means such as screwing or welding. Arranged. The sealing material 55 is a cylindrical outer brush layer 57 that is formed by bundling flexible wires such as polyamide 56 and 58 so that the lower ends 56b and 58b are free ends. And an inner brush layer 59 on the inner peripheral side. The outer brush layer 57 is configured such that the wire 56 is longer than the wire 58 of the inner brush layer 59, and the bending rigidity of the wire 56 is lower than that of the wire 58 of the inner brush layer 59.

  Incidentally, in the case of the embodiment, the wires 56 and 58 are made of the same polyamide, the wire 56 of the outer brush layer 57 has a diameter of 0.3 mm, and the wire 58 of the inner brush layer 59 has a diameter of 0.6 mm. The upper ends 56a and 58a are bundled on the holder 54 with a difference of about 5 mm in length.

  The outer brush layer 57 and the inner brush layer 59 are formed by bundling the wires 56 and 58 so as to have a thickness dimension T of about 6 mm.

  The sealing material 55 is attached to the housing 51 so that the lower end 59a of the inner brush layer 59 is in contact with the processing surface 1, in other words, coincides with the lower surface of the wheel 20.

  Further, as shown in FIG. 4, the supply head section 40 in the center of the ceiling wall section 52 has an inflow passage section 41 for connecting the main flow path 38 of the treated water W to the upper end side and flowing the treated water W therein. The bearing shaft 43 is provided below the inflow path portion 41 so as to rotatably support the support shaft 65 extending in the vertical direction. In addition, the supply head unit 40 is provided with a rotation driving unit 45 provided with an air motor 47 so as to rotate the support shaft 65 below the bearing unit 43. An air hose 29 e that supplies air A is connected to the rotation drive unit 45.

  The support shaft 65 is disposed around the treated water flow channel 66 penetrating along the vertical direction, and the rotor 48 of the air motor 47 is coupled to the outer peripheral side. When the air A is supplied to the air motor 47, the support shaft 65 rotates the rotor 48 and rotates with the rotation of the rotor 48. The support shaft 65 allows the treated water W from the inflow path portion 41 of the supply head portion 40 to flow from the inlet 66a at the upper end of the treated water channel 66, and a plurality of outlets 66b provided on the outer periphery of the lower end (FIG. 5). See).

  As shown in FIG. 5, the lower end 65 a of the support shaft 65 is a tapered surface that narrows down, and fastens the fastener 68 to fasten the boss portion 72 in the holding base 71 of the rotary sprayer 70. And the support shaft 65 will comprise the rotation center RC of the rotary injection body 70 in the center.

  As shown in FIGS. 5 to 7, the rotary spray body 70 includes a holding base 71, a spray nozzle 80, a spacer 85, and a nozzle cover 87. The holding base 71 is made of a metal such as stainless steel, and includes a boss portion 72 that is fastened to the lower end 65a of the support shaft 65 at the center, and a plurality of (eight in the embodiment) nozzle arms 73 are radially formed from the boss portion 72. Projected evenly.

  Each of the nozzle arms 73 has a transverse flow path 73a into which treated water W from the outlet 66b of the support shaft 65 flows in from the inner peripheral surface side of the boss portion 72, and a plurality of branches extending from the transverse flow path 73a downward. The branch flow path 73b. Each branch flow path 73 b is a flow path for supplying the treated water W to the injection nozzle 80, and is formed corresponding to the arrangement position of the injection nozzle 80.

  Note that the distal end of the lateral flow path 73 a away from the boss portion 72 is closed by a sealing plug 75.

  The spray nozzle 80 protects the tip portion 82 and the cylindrical orifice portion 81 that is screwed and fixed to each nozzle arm 73, the tip portion 82 that is screwed to the lower end of the orifice portion 81, and the tip portion 82. And a protector unit 83.

  In the case of the embodiment, the orifice portion 81 and the tip portion 82 are made of metal such as stainless steel, and the protector portion 83 is made of a synthetic resin such as polyethylene. Further, the protector portion 83 is configured by a bottom wall portion 87 b of the nozzle cover 87, and is shared so as to cover the lower portion of the tip portion 82 of each injection nozzle 80.

  As described above, the nozzle cover 87 is made of synthetic resin such as polyethylene, and covers the bottom of the holding base 71 including the fastener 68 of the support shaft 65 and the edge of the bottom wall 87b. And a side wall 87a that extends upward from the base and matches the outer shape of the holding base 71.

  The spacer 85 is formed of a synthetic resin such as polyacetal, and is disposed between the nozzle cover 87 and the holding base 71 so that the bottom wall portion 87b of the nozzle cover 87 forms the protector portion 83 of the injection nozzle 80. In addition, the bottom wall portion 87 b is used to be disposed close to the lower portion of the tip portion 82, and is formed in a cylindrical shape that matches the outer shape of the holding base 71.

  The spacer 85 is fixed to the holding base 71 using a plurality of predetermined bolts 86 (see FIG. 6), and the nozzle cover 87 is attached to the spacer 85 using a plurality of predetermined bolts 88. ing.

  The nozzle cover 87 is disposed to protect the spray nozzle 80, particularly the tip portion 82 from the unevenness of the treatment surface 1. The protector portion 83 below each tip portion 82 is treated water W However, if the treated water W is ejected, the treated water W itself forms a through hole 83a for ejecting the treated water W. (See FIGS. 5 and 8).

  The distance CL between the spray nozzle 80 and the processing surface 1 during the processing of the processing surface 1, more specifically, the distance CL between the protector portion 83 and the processing surface 1 is set to be within a range of 5 to 20 mm. Has been. The distance CL in the embodiment is 7 mm.

  The distance CL between the spray nozzle 80 and the processing surface 1 can be adjusted by increasing or decreasing the amount of spacer interposed when the supply head portion 40 is attached to the ceiling wall portion 52 of the housing 51. it can. That is, since the rotary ejector 70 is supported by the lower end 65a of the support shaft 65 and the support shaft 65 is held by the supply head unit 40 by the bearing unit 43, the supply head unit 40 is adjusted while adjusting the amount of the spacer. If the height attached to the ceiling wall part 52 is adjusted, the distance CL between the spray nozzle 80 and the processing surface 1 can be adjusted.

  In the embodiment, as shown in FIGS. 6 and 9, a total of 30 injection nozzles 80 are provided on a predetermined nozzle arm 73 by three to four. Each nozzle arm 73 has a length dimension LN from the rotation center RC of 150 mm and a width dimension BN of the nozzle arrangement area 74 for arranging the injection nozzle 80 so that the rotary injection body 70 can be configured compactly. Is approximately 90 mm. The nozzle arrangement area 74 has a screw portion for connecting the sealing plug 75 to the dimension on the boss portion 72 side where the support shaft 65 can be fastened by the fastener 68 and the transverse flow path 73a into which the treated water W can flow is formed. Is an area where the injection nozzle 80 can be disposed by screwing the orifice portion 81 of the injection nozzle 80, except for the dimensions provided at the tip of the nozzle arm 73. The position of the center of the injection port 82a of the tip portion 82) is shown as a reference.

  In addition, the spray nozzle 80 of the embodiment uses a nozzle that has a discharge amount of 0.52 liter / min when the discharge pressure of the treated water W is 225 Mpa. The opening diameter is about 0.15 mm.

  In addition, the injection nozzle 80 should just be a thing with the discharge amount of 0.2-3.5 liter / min by making the discharge pressure of water into the range of 100-280 Mpa, and if it converts with the opening diameter of the injection port 82a. , 0.07 to 0.4 mm (more precisely, about 0.07 to 0.37 mm) can be used.

  Incidentally, FIG. 16 is a graph showing the relationship between the opening diameter, discharge amount, and discharge pressure in the injection nozzle. As can be seen from this graph, a discharge amount of 3.5 liters / min or less cannot be secured unless the opening diameter is 0.37 mm or less at a discharge pressure of 280 Mpa.

  Further, in this type of injection nozzle 80, when the orifice portion 81 is attached to the nozzle arm 73 by screw connection, a screw tightening tool is not inserted unless the orifice portion 81 is provided with an interval of about 18 mm or more. In consideration of the assembly strength with the nozzle arm 73 and the strength of the flow path of the high-pressure treated water W, the number of spray nozzles 80 disposed in the nozzle placement area 74 of one nozzle arm 73 is five. Is the limit.

  Further, the arrangement state of each of the 30 injection nozzles 80 in the embodiment is as shown in FIGS. 9A to 9C when the rotary injection body 70 is rotated with the movement of the housing 51 stopped. 80 rotation trajectories (rotation trajectory at the center of the opening of the injection port 82a of each injection nozzle 80) TR draws 30 concentric arcs, and the pitch (radial dimension difference) P between the arcs is 3.1 mm. It is set so that the pitches P are uniform.

  In the surface treatment apparatus 10 according to the embodiment, the movement of the housing 51 is set to 6 m / min (100 mm / s), the rotation of the rotary sprayer 70 is set to 1800 rotations / min (30 rotations / s), and the rotation is performed every 10 rotations. If the rotation trajectories TR of the 30 arcs are described while being shifted (in other words, if the rotation trajectories TR are indicated by being shifted every 33.333... (= 100/3) mm), then FIG. As shown in D and E, it becomes a precise trajectory without a large gap (Note that this description method also applies the rotational trajectory TR to 33 in FIG. 10B, FIG. 11D, and FIG. 12D. .333 ... (= 100/3) mm and are overlaid and shifted).

  Of course, in practice, the rotary sprayer 70 rotates at a rotational speed within the range of 1800 to 2000 revolutions / min and rotates at 30 revolutions or more in 1 second. The thin needle-shaped treated water W sprayed from the nozzle 80 is uniformly applied to be treated.

  Incidentally, when the rotary sprayer 70 rotates about 1800 to 2000 times / min, the rotation radius of the injection nozzle 80 disposed on the outer peripheral end side of the rotary sprayer 70 is about 127 mm, and the circumference is 127 mm × 2 × π = about 0.80 m, the rotation radius of the injection nozzle 80 on the rotation center side is about 35 mm, and the circumference is 35 mm × 2 × π = about 0.22 m. Therefore, when rotating about 1800 to 2000 times / min, the jet nozzle 80 on the outer peripheral end side is on the processing surface 1 at a high speed of 1440 to 1600 m / min, and the jet nozzle 80 on the rotation center side is at a high speed of 396 to 400 m / min. Will be moved.

  In FIG. 10, as a rotary injection body 700 of a comparative example, the number of injection nozzles 80 is 20 in total, and 3 to 5 nozzles 73 are arranged on the nozzle arm 73, and the same is obtained when the rotary injection body 700 is rotated. An example in which 18 concentric rotation tracks TR are concentric is given. It can be seen that the rotation trajectory TR of the rotary ejector 700 of this comparative example has a portion with a pitch P exceeding 5 mm, and a large gap portion is generated.

  When the treatment surface 1 is decontaminated using the surface treatment apparatus 10 according to the embodiment, first, the air supply hose HA and the treatment water supply hose HW extending from the treatment fluid supply vehicle PC are surfaced on site. A suction hose HV extending from the vacuum wheel VC is connected to the suction duct 63 while being connected to the air joint 27 of the treatment device 10 and the treated water joint 35 of the switching valve 36. Then, the processing fluid supply vehicle PC and the vacuum vehicle VC are actuated to supply the predetermined air A and the treated water W to the surface treatment apparatus 10, the operation switch 25 is turned on, and the rotary ejector 70 is set to 1800. For example, if the treated water W having a discharge pressure of 225 Mpa is supplied and moved forward at a moving speed of 6 m / min while rotating at a rotational speed of ˜2000 times / min, the treated water W is discharged from each spray nozzle 80. The processing surface 1 can be processed by being injected.

  At this time, in the embodiment, each of the injection nozzles 80 performs processing from each of the injection nozzles 80 at a discharge amount of 0.52 liter / min when the discharge pressure is 225 MPa and a distance CL from the processing surface 1 is 7 mm. Water W is jetted.

  Since the injection of the treated water W can be performed at a high pressure of 225 Mpa within the range of 100 to 280 Mpa, the discharge amount from each injection nozzle 80 can be a small amount of about 0.52 liter / min. The treated water W can be made to collide with the treatment surface 1 as a water columnar shape (hair shape). Therefore, such injection of the treated water W can be removed and collected from the treatment surface 1 while reducing the adhesion (scraping) of the treatment surface 1 and finely adhering the adherent radioactive material. .

  That is, in the decontamination processing method of the embodiment, since shot water, sand blast, and polishing machine using steel balls are not used, water such as tap water can be used as the treated water W. By applying the impact force of the pressure, the adhering material to which the radioactive material has adhered can be made fine, and the fine particle-like filth is wetted with the mist-like treated water W or wrapped in water, and suction means The fluid (mist-like) sewage DW that can be sucked at 62 can be obtained. And if it becomes the sewage DW of the fine particle fluid containing the radioactive substance, it is quickly sucked by the suction means 62, so that the radioactive substance deposits and the treated water W are not leaked out of the housing 51, that is, The treatment surface 1 can be efficiently decontaminated without attaching a radioactive substance to the treatment surface 1 again.

  Further, the water supply amount of the treated water W of the entire rotary sprayer 70 is set to 15.6 liters / min which is 20 liters / min or less, and the discharge amount from each spray nozzle 80 is 0.2 to 3.5 liters. If it is set to about 0.52 liter / min within the range of / min, the capacity of the sewage DW after being sucked by the suction means 62 can be reduced as much as possible.

  If the discharge amount from each injection nozzle 80 is less than 0.2 liter / min, the amount of water supply can be reduced, but the impact force of the treated water W becomes small, and it is difficult to separate deposits from the treated surface 1. Thus, it is difficult to secure the treatment effect, and if it exceeds 3.5 liters / min, the total water supply amount simply increases, the treatment effect cannot be improved, and the volume of sewage DW collected after treatment increases. Therefore, the discharge amount from each injection nozzle when the discharge pressure is in the range of 100 to 280 Mpa is 0.2 to 3.5 liters / min, preferably 0.2. A range of ˜1.0 liter / min is desirable.

  Furthermore, if the supply amount of the treated water W of the entire rotary sprayer 70 exceeds 20 liters / min, the capacity of the sewage DW to be collected increases, and the post-treatment is burdened.

  If the distance between the spray nozzle 80 and the treatment surface 1 is less than 5 mm, the spray nozzle 80 is likely to be damaged when the treatment surface 1 is uneven, and if it exceeds 20 mm, the treated water W is applied to the treatment surface 1. The distance CL between the spray nozzle 80 and the processing surface 1 is preferably in the range of 5 to 20 mm, because it becomes a mist that reduces the impact force just before it reaches and reduces the processing effect. It is desirable to be within a range of 5 to 10 mm.

  In the decontamination processing method of the embodiment, the discharge pressure of the treated water W from each spray nozzle 80 is 225 Mpa within the range of 125 to 225 Mpa. However, in this discharge pressure range, the processing surface is about 1 to 2 mm. However, the processing surface 1 can be suitably decontaminated in a range that does not require construction for restoration. On the contrary, since the surface of the processing surface 1 can be cut evenly and thinly, the surface can be cleaned cleanly, a predetermined frictional resistance can be recovered, and the function as a road surface can be improved. Incidentally, even if the type of treated surface is different from interlocking, asphalt, concrete, resin pavement, stone pavement, etc., the surface treatment apparatus 10 of the embodiment is used and the discharge pressure of the treated water W is in the range of 125 to 225 MPa. If the decontamination process is carried out by spraying in, the various treatment surfaces 1 of about 90% can be decontaminated to 200 cpm or less.

  However, the processing surface 1 may be decontaminated within the range of 100 Mpa or more and less than 125 Mpa or within the range of 280 Mpa or more exceeding 225 Mpa, deviating from the above range. Incidentally, in the range of 100 Mpa or more and less than 125 Mpa, it is preferable when a radioactive substance is attached to the exposed surface of the processing surface. In the case of being in the range of 225 to 280 Mpa, it is preferable when the processing surface has irregularities, and the radioactive substance is embedded in the deep inside portion of the concave portion, but the processing surface is preferable. Therefore, it is desirable to use a decontamination method that is used only when the cpm value after the treatment does not greatly decrease.

  In the decontamination processing method of the embodiment, when the amount of treated sewage DW sucked by the suction means 62 is further reduced, the amount of treated water supplied to the entire rotary sprayer is within a range of 6 to 12 liters / min. It is good. In this case, when using the injection nozzle 80 with a discharge amount of 0.52 liter / min when the discharge pressure of the embodiment is set to 225 Mpa, 20 nozzles are provided as in the rotary sprayers 70A and 70B in FIG. If the spray nozzle 80 is used, the amount of treated water W supplied to the entire rotary sprayers 70A and 70B can be 10.4 liters / min. Or, when 30 injection nozzles 80 are used as in the rotary injection body 70 of the embodiment, the discharge amount when the discharge pressure is 225 MPa is about 0.26 liter / min (the opening diameter is about 0.075 mm). ), The amount of treated water supplied to the entire rotary sprayer 70 can be set to 7.8 liter / min within the range of 6 to 12 liter / min. Further, even when 40 injection nozzles 80 are used as in the rotary injection body 70C shown in FIG. 12, the discharge amount when the discharge pressure is 225 Mpa is about 0.26 liter / min (the opening diameter is 0, If the spray nozzle 80 of about 075 mm) is used, the amount of treated water supplied to the entire rotary spray body 70 can be 10.4 liter / min within the range of 6 to 12 liter / min.

  And in the decontamination processing method which makes the water supply amount of the treated water W to the whole rotary spray bodies 70, 70A, 70B, 70C in the range of 6-12 liters / min, the sewage DW after the process sucked by the suction means 62 The amount of water becomes small and post-treatment becomes easy. Further, the recovery tank 91 for collecting and treating the sewage DW, or the treatment tank 92 for separating and filtering radioactive deposits in the sewage DW, etc. Can be made compact, and post-processing can be performed at the decontamination site, so that decontamination processing can be performed quickly.

  Furthermore, in the decontamination processing method of the embodiment, the sewage DW sucked by the suction means 62 is used as the treated water W, and the supernatant liquid CW after performing the precipitation treatment using the flocculant and the filtration treatment is used. ing. Therefore, in the embodiment, the sewage DW can be reused as the treated water W, preparation of new treated water W at the decontamination site and reduction of the amount of contaminated waste can be reduced, and decontamination work at the site is efficient. Can be done.

  In addition, as for the treated water W to be used, the supernatant liquid CW may be utilized for the whole quantity, and new water may be used suitably.

  In the decontamination processing method of the present invention, the number of spray nozzles 80 used is within a range where the amount of treated water W supplied to the entire rotary sprayer 70 is 20 liters / min or less, and each spray nozzle is used. The rotary spray body 70 is arranged so that the rotation trajectories of the spray nozzles 80 at the time of the rotation of the rotary spray body 70 are shifted from each other within the range in which the shaving of the treatment surface 1 is suppressed by the jet of the 80 treated water W. As long as the surface treatment apparatus is arranged in the above, it is not necessary to use the surface treatment apparatus 10 of the embodiment. For example, a nozzle arm 73 having a length dimension LN of 150 mm or less may be used. Even in this case, the suction means 62 is operated so that the distance between each spray nozzle 80 and the processing surface 1 is within the range of 5 to 20 mm, and the discharge pressure is within the range of 100 to 280 Mpa, preferably within the range of 125 to 225 Mpa. It is only necessary to rotate the rotary spray body 70 and to move the housing 51 along the processing surface 1 while spraying the treated water W from the spray nozzles 80.

  However, in the surface treatment apparatus 10 of the embodiment, the injection nozzles 80 for injecting the treated water W in the form of thin needles are disposed on the plurality of nozzle arms 73 and rotate, and rotate from the rotation center RC at that time. A number of concentric arcs having a pitch P with a trajectory TR of 3.1 mm are used. Therefore, while the treated water W is sprayed from each spray nozzle 80 and the rotating spray body 70 is rotated, the wheels 20 are used. If it is moved, needle-shaped treated water that is evenly intimately contacted can be spirally ejected as much as possible, and even if the discharge amount from each spray nozzle 80 is about 0.52 liter / min, The processing surface 1 can be processed.

  When the pitch P of the rotation trajectory TR is less than 2.3 mm, the injection nozzles 80 that inject the treated water W at a high pressure are too close to each other, causing a decrease in the strength of the nozzle arm 73, and the like. It is difficult to arrange on the nozzle arm 73, and if it exceeds 4.8 mm, there is a gap in the locus on the processing surface 1 (see FIG. 10), and the processing water W sprayed from the spray nozzle 80 is spread over the entire processing surface 1. Since it becomes difficult to apply evenly, the pitch P of the rotation trajectory TR is preferably 2.3 to 4.8 mm, and more preferably 2.5 to 3.3 mm.

  Therefore, in the surface treatment apparatus (decontamination apparatus) 10 of the embodiment, the surface of the treatment surface 1 can be suppressed, the treatment surface 1 can be effectively decontaminated, and the use amount of the treated water W can be suppressed. Therefore, the post-treatment of the collected sewage DW becomes easy, and it is suitable for decontamination of harmful substances (radioactive substances).

  In the surface treatment apparatus 10 according to the embodiment, the rotary spray body 70 and the 30 spray nozzles 80 each have a discharge amount of 0.52 liters / min when the discharge pressure is high. The total amount of treated water W is 15 liters / min, and the nozzle arms 73 are eight with a length LN from the rotation center RC of approximately 150 mm, and are arranged radially from the rotation center RC. Yes. Further, the number of injection nozzles 80 arranged on one nozzle arm 73 is three or four, five or less, and the injection is performed when the rotary injection body 70 is rotated with the movement of the housing 51 stopped. It arrange | positions so that the rotation locus | trajectory TR of the nozzle 80 may be 30 concentric arcs.

  With such a configuration, it is possible to suitably form the rotary ejector 70 within a practical range.

  That is, if the supply amount of the entire treated water is 15 liters / min within the range of 6 to 20 liters / min, the contaminated treated water W after the treatment sucked by the suction means 62 becomes small, Post-processing becomes easy.

  If the total amount of treated water supplied is less than 6 liters / min, it becomes difficult to secure the discharge amount from each injection nozzle 80 in a state where the treatment effect is ensured, and if it exceeds 20 liters / min, Since the amount of the treated water W after treatment increases and the post-treatment is burdened, the total amount of treated water supplied is 6 to 20 liters / min, preferably 6 to 12 liters / min. Within range is desirable.

  In this case, if the total amount of treated water supplied is within a desirable range of 6 to 12 liters / min, for example, 12 liters / min, the rotary spray body uses 30 injection nozzles 80. The discharge amount of each of the injection nozzles 80 is 12/30 liters / min, 0.4 liter / min. As described above, the rotary injection body has 30 injection nozzles 80 corresponding to the discharge amount. One piece will be used.

  Moreover, the injection nozzle 80 which makes the supply amount of the whole treated water within the range of 6 to 20 liters / min and makes the discharge amount under the respective high pressures within the range of 0.2 to 3.5 liters / min, The maximum number of cases is 40, and the number of injection nozzles is 40 or less, and the rotation trajectory TR of each injection nozzle 80 is 40 concentric corresponding to the number of injection nozzles 80 used. This is as follows (see the rotating sprayer 70C in FIG. 12).

  Further, if the number of nozzle arms of the rotary sprayer 70 is set to 4 to 8 and the number of spray nozzles in each nozzle arm 73 is set to 5 or less, the length dimension LN from the rotation center RC of each nozzle arm 73 is set. Even if it is compact 150 mm, the nozzle arm 73 can be easily formed even if the pitch P of the rotation trajectory TR of the injection nozzle 80 is in the range of 2.3 to 4.8 mm so as to cover the processing surface 1 closely. Each injection nozzle 80 can be arranged while securing the strength of the flow path of the high-pressure treated water W and the arrangement space of the rotating structure.

  That is, first, if the number of nozzle arms 73 is eight and the number of spray nozzles 80 in each nozzle arm 73 is five as in the case of the rotating spray body 70C, the rotational trajectories of the many spray nozzles 80 are concentric. Each of the injection nozzles 80 can be easily arranged on the largest 40 nozzles.

  That is, even if the length LN from the rotation center RC of each nozzle arm 73 is set to a compact size of about 150 mm, the strength of the flow path of the high-pressure treated water W in each nozzle arm 73 and the arrangement space of the rotation structure (nozzle arrangement) In consideration of the area 74), the nozzle arrangement area 74 is an area having a width dimension BN of about 90 mm in the radial direction of each nozzle arm 73. Even in such an area 74, a maximum of five injections The nozzle 80 can secure 2.3 mm with the rotation trajectory TR as an equal pitch P, and can be easily arranged.

  Therefore, the pitch P of the rotation trajectory TR between the injection nozzles 80 is set to 2.3 m so that the processing surface 1 can be closely covered as in the case of the rotary injection body 70 </ b> C, and the rotation trajectories TR of many injection nozzles 80 are set. Even if 40 are concentric, 40 are within the range of a width dimension BN along the radial direction of about 90 mm that can be secured as the nozzle arrangement area 74 within the length dimension LN of 150 mm of the nozzle arm 73. The rotary sprayer 70C can be configured so as to secure a large number of arcuate rotation trajectories TR having a predetermined pitch P while arranging the spray nozzles 80, and the rotary sprayer 70C can be configured in a compact manner. it can.

  Further, as a modified example, as in the rotating spray bodies 70A and 70B of the modified example shown in FIG. 11, the pitch P is set within the range of 2.3 to 4.8 mm as the rotation trajectory TR of a large number of injection nozzles 80, and is concentric. If 20 arcs can be formed, the number of nozzle arms 73 may be 5 or 8. Incidentally, the rotary spray body 70A has eight nozzle arms 73, two to three spray nozzles 80 are disposed in the nozzle placement area 74 of the predetermined nozzle arm 73, and the rotary spray body 70B is The number of nozzle arms 73 is five, and four injection nozzles 80 are arranged in a nozzle arrangement area 74 of a predetermined nozzle arm 73. In both of these rotary sprayers 70A and 70B, the pitch P of the rotation trajectory TR of each spray nozzle 80 is set to an equal 4.8 mm, and the process nozzle W rotates while spraying the treated water W from each spray nozzle 80. If it moves, it turns out that it becomes a precise | minute locus | trajectory as shown to D and E of FIG. 11, and can process efficiently.

  As for the rotation trajectory of many injection nozzles, if 20 or more concentric arcs can be formed, high-pressure treated water is injected within the range of the width dimension BN along the radial direction of about 90 mm in each nozzle arm. Even if the number of injection nozzles is set to 5 or less, and the minimum number of nozzle arms is 4, the pitch of the rotation trajectory of the injection nozzle can be easily adjusted so that the processing surface can be covered closely. Can be set to 4.8 mm within the range of 2.3 to 4.8 mm.

  However, if the rotational trajectory is configured to have 19 or less concentric arcs, the rotating jet 700 as shown in FIG. 10 is obtained, and the pitch P of the rotational trajectory TR of the spray nozzle 80 is 4.8 mm. This is not preferable because a portion exceeding 5.0 mm exceeding is generated, and the clearance of the locus on the treatment surface 1 of the treatment water W ejected from the ejection nozzle 80 is increased, thereby reducing the treatment effect.

  Further, if the number of nozzle arms 73 is three or less, even if five spray nozzles 80 are arranged in each nozzle arm 73, the rotation trajectory of each spray nozzle 80 in the stationary state of the housing 51 is 20 pieces. In the case of nine or more, the nozzle arms 73 are too close to each other, making it difficult to apply the negative pressure of the suction means 62 near the rotation center RC of the rotary sprayer. There is a possibility that the sewage DW may be left on the processing surface 1. Therefore, the number of nozzle arms 73 is 4 to 8, preferably 5 to 8.

  Incidentally, FIG. 13 shows the size of the gap SA between the nozzle arms 73 when the number of the nozzle arms 73 is increased. As can be seen from this figure, the ratio of the area of the gap SA (the area of the oblique line extending to the lower right) to the rotating area of the nozzle arm 73 (the circular area when the nozzle arm 73 having a length of 150 mm is rotated) (Void ratio) is 58% for five nozzle arms 73, 51% for six nozzle arms 73, 45% for seven nozzle arms 73, 41% for eight nozzle arms 73, and nozzle arms 73 Nine was 37% and 10 nozzle arms 73 was 33%. When the number of nozzle arms 73 is nine or ten, the void ratio is less than 40%, and it is difficult for the negative pressure of the suction means to act near the rotation center RC of the rotary sprayer. The number is 4 to 8, preferably 5 to 8.

  Furthermore, when the number of nozzle arms 73 is large, the weight of the rotary spray body increases, the rotational speed of the rotary spray body that also affects the assistance of the suction capability from the suction duct 63 decreases, and the support shaft 65 From the viewpoint of adverse effects of weight increase, the number of nozzle arms 73 is desirably 4 to 8, and desirably 5 to 8.

  In the surface treatment apparatus 10 according to the embodiment, the pitch P of the rotation trajectory TR of the spray nozzle 80 when the rotary sprayer 70 rotates the rotary sprayer 70 while the movement of the housing 51 is stopped is equalized. Each injection nozzle 80 is arranged so that

  Therefore, in the surface treatment apparatus 10 of the embodiment, if the treated water W is jetted from each jet nozzle 80 of the rotary jet 70 that rotates while being moved, the pitch P of the rotation trajectory TR is set to a small 2.3 to 4.8 mm. In addition to the action / effect within the range, the treated water W can be evenly applied to the treatment surface 1 and the treatment can be performed efficiently.

  In addition, the effect | action and effect in the case of setting it as the said uniform pitch P are similarly ensured also when using rotary injection body 70A, 70B, 70C shown in FIG.

  Incidentally, if the above points are not taken into consideration, the pitch P of the rotation trajectory TR is set within the range of 2.3 to 4.8 mm, and the pitch P of the rotation trajectory TR of the injection nozzle 80 is not equalized, and each of the injection nozzles 80. May be provided.

  Furthermore, in the surface treatment apparatus 10 according to the embodiment, when each of the spray nozzles 80 rotates the rotary spray body 70 in a state where the movement of the housing 51 is stopped, each of the arc trajectories does not overlap with another arc. It is arranged to do.

  Therefore, in the surface treatment apparatus 10 of the embodiment, the spray nozzles 80 that spray the treated water W rotate so as to draw a trajectory of an arc (a spiral shape if moved) without overlapping each other. For this reason, the treated water W can be evenly applied to the treatment surface 1 and can be effectively treated while suppressing the shaving of the treatment surface 1.

  In addition, the effect | action and effect of the rotation locus which the above-mentioned injection nozzles do not overlap are similarly ensured also when using the rotary injection bodies 70A, 70B, and 70C shown in FIGS.

  Incidentally, if the above points are not taken into consideration, some of the injection nozzles 80 may be arranged so as to overlap the rotation trajectory TR.

  Further, when the number of nozzle arms 73 is eight, four to five injection nozzles 80 are arranged in each nozzle arm 73, a total of about 34 to 38 injection nozzles 80 are used, and the pitch P is set to 2. The injection nozzle 80 may be arranged to form a rotary injection body so as to form 34 to 38 arc rotation trajectories TR that are evenly within a range of 5 to 2.8 mm.

  FIG. 14 shows a model diagram in which the arrangement state of the injection nozzles when the number of nozzle arms in the rotary injection body is changed is developed.

  As can be seen from this figure, when the number of nozzle arms is 10, as shown in FIG. 14A, a maximum of 44 injection nozzles 80 are arranged, and the pitch P of the rotation locus is set to 2.1 mm. it can. However, with such a configuration, the porosity described above is low and smooth processing cannot be performed.

On the other hand, when the number of nozzle arms is 8, 6, or 5, as shown in B, C, and D of FIG.
35 spray nozzles 80 are arranged, and the pitch P of the rotation locus is 2.7 mm.
25 injection nozzles 80 are arranged, and the pitch P of the rotation locus is 3.8 mm,
21 injection nozzles 80 are arranged, and the pitch P of the rotation locus is 4.6 mm.
Etc. can be set.

  Furthermore, in the surface treatment apparatus 10 of the embodiment, a plurality of types with different discharge amounts may be used for the injection nozzle 80 to be used. In this case, for example, as shown in FIGS. 6 and 9, the injection nozzle 80L that increases the discharge amount is separated from the rotation center RC in the rotation trajectory TR of each injection nozzle 80 from the injection nozzle 80S that decreases the discharge amount. It arrange | positions so that it may become an outer circular arc.

  For example, the injection nozzle 80L has a discharge amount of 0.98 liter / min (0.20 mm in terms of the opening diameter of the injection port) when the discharge pressure is 250 Mpa, and the injection nozzle 80S has a discharge pressure of 250 Mpa. In this case, the discharge amount is 0.5 liter / min (0.15 mm in terms of the opening diameter of the injection port), 5 injection nozzles 80L are used, and 25 injection nozzles 80S are used. In this case, the total water supply amount is 17.4 liters / min.

  In such a configuration, the injection nozzle 80L whose arc of the rotation trajectory TR is on the outer side is disposed on the distal end side of the nozzle arm 73 away from the rotation center RC, and therefore, in the rotational direction from the inner injection nozzle 80S. The movement speed and amount of movement will increase. However, if the discharge amount of the outer injection nozzle 80L away from the rotation center RC is larger than the discharge amount of the inner injection nozzle, the discharge amount of treated water per unit length of the arc of each rotation locus is reduced as much as possible. Can be equalized.

  As a result, in the above configuration, the pressure of the treated water W against each part of the treatment surface 1 in the rotary spray body 70 per rotation is eliminated without affecting the distance of the arrangement distance of the spray nozzles 80L and 80S from the rotation center RC. The (capacity / impact force) can be equalized, and further effective processing can be performed while suppressing the cutting of the processing surface 1.

  In the illustrated example, the case where the two types of ejection nozzles 80L and 80S are used has been described. However, for example, the total water supply amount is within a range of 20 liters / min, and three or more types of ejection amounts are used. You may make it arrange | position the injection nozzle with many discharge amounts in order as using the injection nozzle and leaving | separating from the rotation center RC side.

  Of course, if the above points are not taken into account, the discharge amount of all the injection nozzles is made equal, or the injection nozzle close to the rotation center RC side is disposed with a larger discharge amount than the outer injection nozzle. May be.

  Further, in the surface treatment apparatus 10 of the embodiment, the housing 51 includes a ceiling wall portion 52 that covers the upper side of the rotary sprayer 70 and a peripheral wall portion 53 that covers the entire periphery of the rotary sprayer 70. In addition, a cylindrical sealing material 55 that can be bent while the lower end 55 a is in contact with the processing surface 1 is disposed at the lower end of the peripheral wall portion 53. The sealing material 55 is formed by bundling flexible wires 56 and 58 so that the lower ends 56b and 58b are free ends, and the outer outer brush layer 57 on the outer peripheral side and the inner peripheral side. And an inner brush layer 59. The wire 56 of the outer brush layer 57 is configured to have a longer length and lower bending rigidity than the wire 58 of the inner brush layer 59.

  Therefore, in the embodiment, it is easy to ensure a sealed state in the housing 51, and the suction means 62 passes through the small gaps between the wire members 56 and 58 of the outer brush layer 57 and the inner brush layer 59 and the air outside the housing 51. The sewage DW after treatment is prevented from leaking out of the housing 51 or remaining on the treatment surface 1 while being sucked. In other words, in such a configuration, the inner brush layer 59 having high bending rigidity can ensure the hermeticity in the housing 51, and the lower end (tip) 59 a of the inner brush layer 59 is treated as the housing 51 moves. As shown by the two-dot chain line in FIG. 8B, the lower end 57b of the outer brush layer 57 which is easily bent is bent while closing the space between the processing surface 1 and the inner brush layer 59, as shown in FIG. The sealed state in 51 can be secured.

  Of course, since the sealing material 55 is formed of a brush in which flexible wire materials 56 and 58 are bundled, even if there is a protrusion such as a pebbles on the processing surface 1, the surface processing device 10 is bent smoothly. Can be moved.

  As shown in the sealing material 55A shown in FIG. 15, the cylindrical shape is longer between the outer brush layer 57 and the inner brush layer 59 than the inner brush layer 59 that can cover the inner surface 57a of the outer brush layer 57. In addition, a thin rubber sheet 60 having a thickness t of about 1 mm that can be bent may be disposed.

  In such a configuration, the rubber sheet 60 can separate the inner brush layer 59 and the outer brush layer 57 from each other, so that the outer brush layer 57 bends inward and enters the inner brush layer 59. Deformation can be prevented. Therefore, even if the inner brush layer 59 is pushed away from the processing surface 1 by being pushed by the protrusion of the processing surface 1 without hindering the sealing performance of the inner brush layer 59, the outer brush layer can be smoothly and smoothly used over a long period of time. 57 can block the space between the processing surface 1 and the inner brush layer 59 so as to complement the sealing performance, and can ensure a sealed state in the housing 51.

  That is, when such a sealing material 55A is used, the sealing performance of the inner brush layer 59 and the complementary action by the outer brush layer 57 of the sealing performance when the inner brush layer 59 is detached from the processing surface 1 are obtained. It can be secured stably with good durability.

  Of course, in the configuration using such a sealing material 55A, the rubber sheet 60 itself can also be bent in contact with the processing surface 1 and be able to secure a sealed state in the housing 51, so that the sealing property of the sealing material 55A can be improved. Can contribute.

  In the illustrated example, the rubber sheet 60 has the same length as the outer brush layer 57, but the lower end 60 a may be shorter than the lower end 57 b of the outer brush layer 57 as long as it is longer than the inner brush layer 59.

In addition, including the case where the rotary sprayers 70, 70A, 70B, and 70C are used, the decontamination method using the surface treatment apparatus of the embodiment (more specifically, the suction amount of the suction means 62 is set to 30 to 40 m ³ / Within the range of min, the rotational speed of the rotary spray body is within the range of 1800 to 2000 times / min (in other words, the rotational speed of each spray nozzle 80 relative to the processing surface 1 is about 390 to 1600 m / min), and processing The discharge pressure of water W is within the range of 100 to 280 Mpa, preferably within the range of 125 to 225 Mpa, and the surface treatment device is moved within the range of 3 to 8 m / min, and interlocking, asphalt, concrete , Resin pavement, road surface such as stone pavement, etc., as a treatment surface 1, a treatment method in which treatment is performed) The Siumu), the processing from the previous state to reduce 80-90%, could be decontaminated.

  Of course, in the above case, the discharge pressure of the treated water W from each spray nozzle 80 may be in the range of 100 Mpa or more and less than 125 Mpa. Such a decontamination processing method is suitable because decontamination can be performed without shaving the processing surface 1 when a radioactive substance is attached to the exposed surface of the processing surface 1.

  FIG. 17 shows the cpm values before and after the decontamination test with various discharge pressures on the treated surface of dense-grained asphalt (As) and concrete (Con), and the reduction rate. A graph showing the relationship is shown. The surface treatment apparatus used for the decontamination test uses the rotary spray body 70B of FIG. 11 and uses 20 spray nozzles 80 with a discharge amount of 0.52 liter / min when the discharge pressure is 225 Mpa. Yes.

  As can be seen from this graph, if the discharge pressure of the treated water W is 100 Mpa or more, a reduction rate of 90% or more can be secured, and if the discharge pressure of the treated water W is within the range of 125 to 225 Mpa, It can be seen that a stable reduction rate of 94% or more can be secured even if the material of the treatment surface is different.

  Further, in the surface treatment apparatus 10 used in the embodiment, the case where the surface treatment apparatus 10 is used for a decontamination method in which the surface of the treatment surface 1 is suppressed is described. In the case where there are adhesive portions, dirt, etc.) on the treatment surface 1, it can also be used as a surface treatment device (removal device) for removing the adhesion layer.

  Furthermore, in the embodiment, the surface treatment apparatus that uses one rotary ejector 70 is illustrated, but a plurality of (eg, two or three) rotary injectors 70 are provided in one large housing, You may comprise a surface treatment apparatus.

  Furthermore, in the embodiment, the case where the post-processing device 90 is mounted on the vacuum vehicle VC itself that constitutes a part of the suction means 62 is shown, but as shown in FIG. The post-treatment device 90A is disposed to perform post-treatment of the sewage DW, and the treated supernatant CW is combined with the water (fresh water) TW stored in the water supply vehicle SC or treated as a single unit. It may be used for W.

  The post-treatment device 90A is larger than the post-treatment device 90, but, like the post-treatment device 90, a precipitation treatment using zeolite or a flocculant and a filtration provided with an ultrafiltration device. And the decontaminated supernatant CW is supplied to the processing fluid supply vehicle PC side.

  DESCRIPTION OF SYMBOLS 1 ... Processing surface, 10 ... Surface treatment apparatus, 20 ... Wheel, 51 ... Housing, 52 ... Ceiling wall part, 53 ... Peripheral wall part, 55, 55A ... Sealing material, 55a ... (Seal material) lower end, 56, 58 ... Wires, 56b, 58b ... lower end (of wire), 57 ... outer brush layer, 59 ... inner brush layer, 60 ... rubber sheet, 62 ... suction means, 70, 70A, 70B, 70C ... rotating jet, 73 ... nozzle arm 74 ... (placement space) Nozzle placement area, 80 ... injection nozzle, 90, 90A ... post-processing device, RC ... center of rotation (rotary spray), LN ... length of nozzle arm, TR ... rotation Trajectory, P ... Pitch (rotation trajectory), CL ... Distance (between spray nozzle and treatment surface), A ... Air, W ... Treatment water.

Claims (15)

A decontamination treatment method that reduces the cpm value of a treated surface by spraying high-pressure treated water onto the treated surface to which a radioactive substance is attached,
A plurality of spray nozzles each having a discharge amount of 0.2 to 3.5 liters / min, with the discharge pressure of treated water being in the range of 100 to 280 Mpa,
A rotary sprayer that is rotatable by arranging a plurality of the spray nozzles and spraying from each of the spray nozzles, with the rotating surface aligned with the processing surface.
A housing that rotatably supports the rotary sprayer, extends to the vicinity of the processing surface, and covers the periphery of the rotary sprayer;
A suction means connected to the housing and capable of sucking sewage mixed with treated water and treated surface deposits;
And using a surface treatment device with
The injection nozzle, the water supply amount of the treated water of the whole rotating spraying body and the number of use in a range of less 20 l / min, and the rotation locus of the injection nozzle during rotation of the rotating spraying body Arranged on the rotating sprayer so as to be shifted from each other,
The suction means is operated so that the distance between each spray nozzle and the treatment surface is within a range of 5 to 20 mm, and treated water is ejected from each spray nozzle with a discharge pressure of 100 to 280 MPa, while the rotation is performed. A decontamination processing method, which is performed while rotating an ejector and moving the housing along the processing surface. The decontamination processing method according to claim 1, wherein the discharge pressure of the processing water from each of the spray nozzles is within a range of 125 to 225 MPa. The decontamination processing method according to claim 1, wherein the discharge pressure of the treated water from each of the spray nozzles is in a range of 100 Mpa or more and less than 125 Mpa.

  The decontamination processing method according to any one of claims 1 to 3, wherein the amount of treated water supplied to the entire rotary spraying body is within a range of 6 to 12 liters / min.   The supernatant liquid obtained by subjecting the sewage sucked by the suction means to precipitation treatment using a flocculant and filtration treatment is used as at least a part of the treated water. The decontamination processing method according to any one of claims 1 to 4. A surface treatment apparatus that can be used in a decontamination treatment method that reduces the cpm value of a treatment surface by injecting high-pressure treatment water onto the treatment surface to which a radioactive substance is attached,
The nozzle arm, in which a predetermined number of injection nozzles for injecting high-pressure treated water are arranged, is arranged so as to extend radially from the center of rotation, and the nozzle is in a state where the rotation surface is along the treatment surface. A rotating sprayer capable of treating the treated surface by causing the treated water to be ejected from the ejection nozzle while rotating the arm;
A housing that rotatably supports the rotary sprayer and covers the periphery of the rotary sprayer;
A suction means connected to the housing and capable of sucking sewage mixed with treated water and treated surface deposits;
A wheel that supports the housing and allows the rotary sprayer and the housing to move along the processing surface;
With
A plurality of the injection nozzles,
The discharge pressure is set within a range of 100 to 280 Mpa, and each is configured as a discharge amount of 0.2 to 3.5 liters / min.
The rotation trajectory of the injection nozzle when the rotary injection body is rotated in a state where the movement of the housing is stopped is set to a large number of radial dimensional differences within a range of 2.3 to 4.8 mm from the rotation center. Concentric arcs, and
So that the distance to the treatment surface is within a range of 5 to 20 mm,
A surface treatment apparatus which is arranged.   The surface treatment apparatus according to claim 6, wherein the spray nozzle for spraying the treated water of the spray nozzle has an opening diameter in a range of 0.07 to 0.4 mm. The rotary spray body is
The total amount of treated water supplied is in the range of 6 to 20 liters / min.
The nozzle arm is within a range of 4 to 8 in which the length from the rotation center is approximately 150 mm, and is arranged radially evenly from the rotation center.
The spray nozzles arranged on one nozzle arm are configured as 5 or less, and
Each injection nozzle is set so that the rotation trajectory of the injection nozzle when the rotary injection body is rotated in a state where the movement of the housing is stopped is an arc within a range of 20 to 40 concentric. The surface treatment apparatus according to claim 6 or 7, wherein the surface treatment apparatus is disposed.   The injection nozzles are arranged so that the radial dimension difference of the rotation trajectory of the injection nozzles is equal when the rotary injection body rotates the rotary injection body with the movement of the housing stopped. The surface treatment apparatus according to claim 6, wherein the surface treatment apparatus is provided.   Each of the spray nozzles is disposed so as to have an arc trajectory that does not overlap with another arc when the rotary spray body is rotated in a state where the movement of the housing is stopped. The surface treatment apparatus according to any one of claims 6 to 9, wherein the surface treatment apparatus is characterized in that: The spray nozzle is used in a plurality of types with different discharge amounts,
In the rotation trajectory of each of the injection nozzles when the injection nozzle that increases the discharge amount rotates the rotary injection body with the movement of the housing stopped from the injection nozzle that decreases the discharge amount, The surface treatment apparatus according to any one of claims 6 to 10, wherein the surface treatment apparatus is disposed so as to form an outer arc separated from the rotation center. The housing comprises:
A ceiling wall portion that covers the upper side of the rotary spray body and a peripheral wall portion that covers the entire periphery of the rotary spray body over the entire circumference.
The lower end of the peripheral wall portion is configured by arranging a cylindrical sealing material that can be bent while the lower end is in contact with the processing surface,
The sealing material includes an outer brush layer on the outer peripheral side and a inner brush layer on the inner peripheral side, each of which has a cylindrical shape by bundling flexible wires with the lower end as a free end. Configured
The outer brush layer is configured by making the length of the wire longer and lowering the bending rigidity of the wire than the inner brush layer. The surface treatment apparatus according to item.   A rubber sheet that has a cylindrical shape longer than the inner brush layer that is capable of covering the inner surface of the outer brush layer between the outer brush layer and the inner brush layer, and that can be bent. The surface treatment apparatus according to claim 12, wherein the surface treatment apparatus is arranged. A decontamination treatment method that reduces the cpm value of a treated surface by spraying high-pressure treated water onto the treated surface to which a radioactive substance is attached,
The suction amount of the suction means is in the range of 30 to 40 m ³ / min, the rotational speed of the rotary sprayer is in the range of 1800 to 2000 times / min, the treated water discharge pressure is in the range of 100 to 280 Mpa , the moving speed Within the range of 3-8 m / min,
14. A decontamination method, which is performed by moving the surface treatment apparatus according to claim 6 on a treatment surface while operating.   The supernatant liquid obtained by subjecting the sewage sucked by the suction means to precipitation treatment using a flocculant and filtration treatment is used as at least a part of the treated water. 14. The decontamination method according to 14.

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