JP5887249B2 - Civil engineering structure blasting apparatus and civil engineering structure repair method using the same - Google Patents

Description

  INDUSTRIAL APPLICATION This invention is used for the local repair of the civil engineering structure which removes rust by injecting a grinding material with respect to local rust in civil engineering structures, such as a bridge, and repairs the said civil engineering structure. The present invention relates to a civil engineering structure blasting apparatus and a civil engineering structure repairing method using the same.

  Generally, steel materials are used for civil structures such as bridges, and the surfaces of these steel materials are painted to prevent corrosion and improve aesthetics. The coating film formed by such coating starts to deteriorate immediately after construction, and there is a possibility that local rust is generated in the process of progressing to the reduction of the coating film and the corrosion of the steel surface. If these local rusts are left unattended, it will lead to a rapid expansion of the rust. Therefore, it is necessary to detect local rust at an early stage by inspection and promptly repair such a part locally. When locally repairing a bridge, etc., first, the base material is exposed by removing the rust locally from the location where rust is generated on the surface of the steel material constituting the bridge. Then, partially paint (so-called repair coating) on the area where rust has been removed. This base preparation work is an important work that affects the life of the repair coating. Even if repair coating is applied to places where the substrate preparation is insufficient and rust remains, rusting may occur early after painting.

  Therefore, conventionally, rust is removed from repaired portions that are corroded by rust using an existing electric tool such as a grinder or jet chisel or a pneumatic tool to adjust the substrate. However, since the surface of the corroded portion has many fine irregularities, it is difficult to completely remove rust with these tools. In particular, in corners and narrow places of structural members such as bridges, it is difficult to insert a tool into these places, so it is difficult to sufficiently adjust the base. Therefore, in view of these points, in order to ensure the quality of the substrate preparation, it is desirable to adopt a sand blasting method in which rust is removed by injecting a powdery grinding material such as sand to the repair site. .

  In the sandblasting method, there are three methods for blowing out powdered abrasives from nozzles, specifically, a direct pressure method, a suction method, and a gravity method. The direct pressure type is a system in which high-pressure air is directly supplied to a tank that contains the abrasive to apply pressure to the abrasive, and the abrasive is blown out of the nozzle together with the high-pressure air.

  The suction type is a method in which the abrasive is sucked up from the tank containing the abrasive by the negative pressure of the nozzle through which high-pressure air passes and is ejected from the nozzle. Such a suction type blasting apparatus is usually provided with a blasting gun that can be carried by an operator by hand. This blast gun has a tank for storing an abrasive and a nozzle. The tank is disposed at a position below the suction side end of the nozzle.

  The gravity method is a method in which an abrasive is dropped from a tank toward a nozzle passage through which high-pressure air passes and blown out of the nozzle together with high-pressure air. In such a blast gun of the gravity blast device, the tank for storing the abrasive is arranged at a position above the suction side end of the nozzle.

  In the suction type and gravity type blasting devices as described above, the relative position between the nozzle and the tank changes when the direction of the nozzle is changed, thereby changing the amount of abrasive supplied to the nozzle. There is a problem that it is difficult to perform sandblasting work stably. In addition, since the suction type and gravity type blasting devices (and tools) have a structure in which the nozzle and the tank are integrated, they have a certain shape and size, so that there is a limit to the construction in narrow places.

  Considering the drawbacks of the suction type and gravity type, when adjusting the substrate in places with many corners and narrow places such as bridges, the amount of abrasive supplied is unlikely to change depending on the orientation of the nozzle. A direct pressure type in which only the nozzle can be brought close to the portion to be ground is considered preferable.

  As a direct pressure type blasting apparatus, there is an apparatus described in Patent Document 1, for example. This apparatus is separately provided with a recovery tank in which abrasives are accommodated and a pressurized tank. In this apparatus, after a predetermined amount of abrasive is filled in the pressurized tank, high-pressure air is supplied to the pressurized tank, and the abrasive is sprayed from the nozzle together with the high-pressure air to perform sandblasting.

JP 2008-307675 A

  However, in a direct pressure blasting apparatus as described in Patent Document 1, since a high-pressure gas is injected into a pressurized tank filled with an abrasive, it is usually made of steel so that it can withstand high internal pressure as a tank. A heavy sealed container is adopted. For this reason, the direct pressure type blasting apparatus is heavy in overall weight, so that it is not easy to transport the blasting apparatus, and there is a disadvantage that the working place is limited. Therefore, there is a problem that it is difficult to move the direct pressure type blasting device to a corner or a narrow part where rust is likely to occur in a bridge or the like, and to perform the blasting operation at the corner or the narrow part. .

  In order to facilitate transportation of the direct pressure blasting device, it is also possible to omit the recovery mechanism such as a recovery tank and transport the blasting device to the work place with the pressurized tank filled with abrasives in advance. However, in this case, since the amount of the abrasive that can be used is limited, it is necessary to suppress the amount of the abrasive used by optimally adjusting the flow rate of the abrasive according to the size and degree of rust. However, in the conventional direct pressure type blasting apparatus, since the apparatus main body is large and has a large weight, the apparatus main body must be installed in a place away from the nozzle even if it is transported to the vicinity of the work place. . Therefore, even if a flow control valve for abrasives is attached to the main body of the machine, the operator who has the nozzle will respond to various conditions such as the material and condition of the repair target during injection of the abrasive. Therefore, it is difficult to adjust the flow rate of the abrasive by operating the flow rate adjustment valve. As a result, it is difficult to reduce the consumption of the abrasive, and there is a problem that the frequency of filling the tank with the abrasive increases.

  The present invention has been made in view of the circumstances as described above, and can be easily moved to a repair target location in a civil engineering structure, and the rust of the repair target location while suppressing consumption of the abrasive. An object of the present invention is to provide a civil engineering structure repair blasting apparatus and a civil engineering structure repairing method using the same.

  The present invention improves the mobility of a blasting device by reducing the weight of the tank while ensuring the pressure resistance of the tank when performing a local repair method for civil engineering structures using a direct pressure blasting device. As a result, the workability of the repair work can be improved.

  That is, the present invention adopts a direct pressure blasting device that is not limited by the direction of the nozzle in order to locally repair the civil engineering structure, and the direct pressure tank is made of steel to ensure pressure resistance. In view of the conventional drawback that it is difficult to reduce the weight because a heavy sealed container is adopted, the present inventors have made extensive studies and as a result, made of resin or light metal made of a lighter material than conventional steel tanks. We considered using a tank. Here, the inventors have noted that the blasting abrasive can be well ejected from the nozzle if the gas pressure required for sandblasting by the direct pressure method is about 0.1 to 0.8 MPa. It has been found that a resin tank made of PET bottles or a light metal tank can sufficiently withstand such a pressure. From this point of view, the present invention has been invented, and this makes it possible to reduce the weight of a direct pressure tank. Further, the present invention achieves prevention of damage to the tank and protection when the tank ruptures by storing such a lightened tank in the case. Furthermore, according to the present invention, the flow rate of the abrasive discharged from the tank stored inside the case can be adjusted from the outside of the case, so that the flow rate of the abrasive can be easily adjusted during the local repair work. In this way, the abrasive can be effectively used even with a limited tank capacity.

  Specifically, the blasting apparatus for civil engineering structure repair according to the present invention is a blasting apparatus that removes rust by spraying a grinding material against rust generated locally in the civil engineering structure, and the grinding material is A tank made of resin or light metal to be stored, the space in which the abrasive is stored, an inlet for introducing gas for pressurizing the abrasive into the tank, and the abrasive And at least one tank having a discharge port for discharging the gas, a case for storing the tank so as to cover the tank, and a gas pressurization source for pressurizing the gas disposed outside the case A connecting portion that communicates with the inlet of the tank, an upstream end and a downstream end, and the upstream end communicates with the outlet; The downstream end is the A hose disposed outside the hose, a nozzle connected to the downstream end of the hose, and a grinding that is provided on the outer surface of the case and adjusts the flow rate of the abrasive material sent from the tank to the hose. And a material flow rate adjusting unit.

  According to such a configuration, the tank made of resin or light metal containing the abrasive is lighter than a pressure vessel made of conventional steel or the like. It can be easily transported to the vicinity of the repair target part by holding it. In addition, since such a lightened tank is stored in the case, it is avoided that the tank is in direct contact with a civil engineering structure or the like, thereby reducing the risk of damage to the tank. Furthermore, after transporting such a tank to the vicinity of the repair target in a state of being stored in the case, a gas pressurization source such as a compressor arranged outside the case is connected to the connection portion, and the connection portion is connected. It is possible to supply the gas supplied from the gas pressurization source directly to the tank. Accordingly, it is possible to locally remove rust at the repair target portion by injecting the abrasive and gas inside the tank toward the repair target portion through the hose and nozzle connected to the tank. As a result, it is possible to reliably remove rust generated at the repair target location in the civil engineering structure. In addition, the abrasive is sprayed directly, i.e., pressure is applied to the abrasive inside the tank by gas and the abrasive is injected through the nozzle, so that the abrasive is stabilized at a predetermined flow rate regardless of the nozzle direction. Can be supplied in a stable manner, and stable local repair work is possible. In addition, since the grinding material flow rate adjustment part that adjusts the flow rate of the grinding material is provided on the outer surface of the case, it is easy to perform depending on various conditions such as the material and condition of the repaired part during local repair work. It is possible to adjust the flow rate of the abrasive. Therefore, it is possible to reliably remove the rust at the repair target portion while suppressing consumption of the abrasive.

  Provided on the outer surface of the case, and can be switched between a conduction state allowing the gas flow between the connecting portion and the tank and a blocking state blocking the gas flow, and the blocking state. In this case, it is preferable to further include a switching portion having a gas vent for releasing the pressure inside the tank to the outside of the tank.

  According to this configuration, after the repair work is completed, the operator operates the switching portion on the outer surface of the case to shut off the gas flow between the connection portion and the tank, and the pressure remaining in the tank is passed through the gas vent. By releasing to the atmosphere, it is possible to reduce the amount of abrasive that leaks from the nozzle due to the pressure remaining in the tank. Further, after the repair work is completed, the pressure inside the tank returns to the same pressure as the atmospheric pressure outside the tank, so that the possibility of deterioration or damage of the tank during moving storage of the tank is reduced.

  Further, the abrasive flow rate adjusting unit is disposed in a gas flow path between the connection unit and the tank, and adjusts a flow rate of gas sent from the connection unit to the tank, thereby the hose from the tank. The flow rate of the abrasive material fed to the gas flow path, the switching unit is downstream of the abrasive material flow rate adjustment unit in the gas flow path, and the gas between the abrasive material flow rate adjustment unit and the tank It is preferable to arrange in the flow path.

  According to such a configuration, in the configuration in which the abrasive flow rate adjusting unit is disposed in the gas flow path between the connection portion and the tank, the switching unit is disposed downstream of the abrasive flow rate adjusting unit in the gas flow path. Therefore, when the switching unit shuts off the gas flow path and releases the pressure inside the tank to the outside of the tank through the gas vent, even if a small amount of abrasive material flows back through the gas flow path along with the gas from the tank, The abrasive can be discharged to the outside through the gas vent of the switching unit on the downstream side without reaching the abrasive flow rate adjusting unit. Therefore, it is possible to avoid the risk of the abrasive material flowing back to the abrasive flow rate adjusting unit.As a result, the abrasive material enters the abrasive flow rate adjusting unit and causes abnormal operation or damage of the abrasive flow rate adjusting unit. It is possible to avoid it.

  In addition, an opening / closing part provided on the outer surface of the case and opening / closing the gas flow path is further provided, the opening / closing part being downstream of the switching part in the gas flow path, the switching part and the It is preferable to arrange in the gas flow path between the tank.

  According to such a configuration, the operator can operate the opening / closing part on the outer surface of the case after the repair work is finished, whereby the gas flow between the switching part and the tank can be blocked by the opening / closing part on the downstream side of the switching part. Is possible. As a result, during switching operation of the switching unit, it is possible to avoid the possibility that the abrasive material flows back in the gas flow path with the gas and bites into the switching unit, and it is possible to avoid abnormal operation or damage of the switching unit. is there.

  Moreover, it is preferable to further include a bypass pipe that bypasses the tank and communicates between the connection portion and the hose.

  According to such a configuration, the bypass pipe bypasses the tank and communicates between the connection portion and the hose, so that the abrasive that goes from the tank to the hose passes through the bypass pipe and the gas that goes from the connection portion to the hose and the hose interior. Can be mixed. As a result, it is possible to appropriately dilute the abrasive with the gas passing through the bypass pipe and inject the abrasive to the location to be repaired. The abrasive can be injected in an optimum amount according to the condition. In addition, since the gas passing through the bypass pipe joins the abrasive and the hose to accelerate the abrasive, it is not necessary to excessively increase the pressure applied to the tank in order to increase the injection speed of the abrasive at the nozzle outlet. As a result, it is possible to reliably inject the abrasive within the pressure resistance of the resin or light metal tank.

  Moreover, it is preferable that the said bypass piping is stored in the inside of the said case.

  According to this configuration, since the bypass pipe is stored inside the case, the risk of the bypass pipe coming into contact with the civil engineering structure when the case is carried is reduced, and the workability is further improved.

  Moreover, it is preferable to further include a bypass gas flow rate adjusting unit that is provided on the outer surface of the case and adjusts the flow rate of the gas supplied to the hose via the bypass pipe.

  According to such a configuration, the flow rate of the gas supplied to the hose via the bypass pipe is adjusted by the bypass gas flow rate adjusting unit, so that it flows through the bypass pipe according to various conditions such as the material and state of the repair target portion. The gas flow rate can be adjusted optimally. Moreover, since the bypass gas flow rate adjusting portion is provided on the outer surface of the case, it is possible to easily adjust the flow rate of the gas flowing through the bypass pipe during the local repair work.

  The nozzle is fixed to a cylindrical nozzle body, an outer peripheral portion of an end portion of the hose, and a hose terminal member that abuts the end portion of the hose with an inlet side end portion of the nozzle body; and the hose terminal A connecting member that connects the member and the nozzle body, and the portion of the end of the hose that is abutted against the inlet side end of the nozzle body has an inner peripheral surface of the hose that is the inlet side end. A tongue that expands in a bell mouth shape on the outer side in the radial direction of the hose so that the tongue is in contact with the inlet side end of the nozzle body. In this state, it is preferable to connect the hose terminal member and the nozzle body.

  According to such a configuration, the bell mouth-like tongue formed on the hose end is in contact with the inlet side end of the nozzle body, and the hose terminal member and the nozzle body are connected by the connecting member. Even a thin hose can be connected to the nozzle body while maintaining sealing performance in a state of being abutted against the end of the nozzle body. As a result, it is possible to employ a thin hose that is easier to bend than a thick hose, and as a result, it is possible to easily point the nozzle connected to the hose toward the rust at the repair target.

  Moreover, it is preferable that a buffer material is provided between the inner surface of the case and the tank.

  In such a configuration, it is possible to mitigate the impact when the tank collides with the case when the tank is moved by the buffer material, and it is possible to reliably prevent damage to the resin or light metal tank. .

  The civil engineering structure repair method of the present invention is a civil engineering structure repairing method using the above-mentioned civil engineering structure repair blast device, wherein the tank containing the abrasive is accommodated in the case and the flow rate of the abrasive A conveying step of conveying the case to the vicinity of the repair target location of the civil engineering structure in a state where the tank and the abrasive flow rate adjusting unit are combined into one case by providing the adjusting unit on the outer surface of the case. And by applying pressure to the abrasive by pumping gas from the gas pressurization source outside the case to the inside of the tank through the connection portion, from the discharge port of the tank to the inside of the tank. The abrasive is discharged to the outside of the tank together with the gas, and the abrasive and gas discharged to the outside of the tank are communicated with the discharge port of the tank. A blasting process for locally removing rust in the repair target part by sending the abrasive to the repair target part from the nozzle and sending it to the nozzle connected to the hose via the hose; An adjustment step of adjusting the flow rate of the abrasive material sent from the tank to the hose by operating the abrasive flow rate adjusting unit provided on the outer surface of the case.

  As described above, in the local repair method for a civil engineering structure according to the present invention, a powdery abrasive is contained in a resin or light metal tank that is lighter than a pressure vessel made of steel or the like. Since the grinding material flow rate adjustment unit is integrated into one case, the case is transported to the vicinity of the repair target location of the civil engineering structure, making it easy to move the tank containing the grinding material and repairing it. The workability is greatly improved. In addition, since such a lightweight tank is accommodated in the case, it is avoided that the tank is in direct contact with a civil engineering structure during transportation, thereby reducing the risk of damage to the tank. Yes. By transporting the tank to the vicinity of the repair target with the tank housed in the case, and then pumping the gas from the gas pressurization source outside the case to the tank, the abrasive and gas inside the tank are connected to the tank. It is possible to remove locally the rust of the repair target part by spraying it toward the repair target part through the hose and nozzle. As a result, it is possible to reliably remove rust generated at the repair target location in the civil engineering structure. In addition, the abrasive is sprayed directly, i.e., pressure is applied to the abrasive inside the tank by gas and the abrasive is injected through the nozzle, so that the abrasive is stabilized at a predetermined flow rate regardless of the nozzle direction. Can be supplied in a stable manner, and stable local repair work is possible. Furthermore, when performing the local repair work by injecting the abrasive from the nozzle as described above, by operating the abrasive flow rate adjustment unit provided on the outer surface of the case, It is possible to easily adjust the flow rate of the abrasive according to various conditions such as the state. Therefore, it is possible to reliably remove the rust at the repair target portion while suppressing consumption of the abrasive.

  As described above, according to the present invention, it is possible to easily move to a repair target location in a civil engineering structure, and to reliably remove rust at the repair target location while suppressing consumption of abrasives. Can do.

It is a perspective view of the blast apparatus for civil engineering structure repair concerning one embodiment of the present invention. It is a perspective view which shows the state which opened the cover of the case of the blasting apparatus of FIG. It is a block diagram which shows schematically the structure of the blasting work state which connected the blasting apparatus of FIG. 1 to the external compressor. It is a perspective view which shows the piping structure of the tank upper part in the case inside of FIG. It is the figure which looked at the case which shows the valve group concentrated on the upper surface of the case of FIG. 1 from diagonally upward. It is a perspective view which shows the piping structure of the tank lower part in the case inside of FIG. It is an expanded sectional view which shows the piping structure of the tank lower part inside the case of FIG. (A)-(d) is a piping diagram which shows the procedure of the valve operation at the time of the blast operation | work in the blasting apparatus of FIG. It is an expanded sectional view of the nozzle of FIG. It is a figure which shows a mode that the base material adjustment of the bolt fastening part of a bridge is performed using the blasting apparatus of FIG.

  Next, the blasting apparatus of the present invention will be described in more detail with reference to the drawings.

  The blasting apparatus 1 shown in FIGS. 1 to 5 is used for local repair for removing rust generated locally in a civil engineering structure such as a bridge.

  The structural members of the bridge are subjected to multiple coatings having a high degree of corrosion resistance, but a relatively large amount of local rust is generated due to the environment and various other factors. Specifically, local rust is often found in corners, constrictions, bolt fastening points, etc. where the components are intricate, and normal repair tools are difficult to enter, making it difficult to adjust the substrate. It is.

  Therefore, as shown in FIGS. 1 to 5, the blasting apparatus 1 according to the present embodiment is a lightweight structure that can be carried by the operator to the above-mentioned repair site in the bridge, and the grinding material S It has a structure that can reliably inject toward the rust. Specifically, the blasting device 1 is connected to four resin-made tanks 2 made of a plastic bottle or the like containing the abrasive S, a case 3 for storing the tanks, a hose 4, and an end of the hose 4. From the nozzle 5, the connecting part 6 connected to the compressor 61 outside the case 3, the pressure regulating valve 7, the distributing part 8 for distributing the compressed air to the two systems on the tank 2 side and the bypass side, and the distributing part 8 The compressed air supply unit 9 that supplies compressed air to the tank 2, the abrasive material conveying unit 10 that conveys the abrasive material S together with the compressed air from the tank 2 to the merging unit 12 on the downstream side, and the distribution unit 8 bypass the tank 2. A bypass unit 11 for supplying compressed air to the downstream junction unit 12, and a junction unit 12 for combining the abrasive S conveyed by the abrasive conveyance unit 10 and the compressed air supplied from the bypass unit 11; Has . The abrasive S and the compressed air merged at the merge section 12 are jetted from the nozzle 5 through the hose 4.

  As shown in FIGS. 1 and 2, the blasting device 1 is combined into one case 3 to form one unit, and after the operator transports the case 3 to the vicinity of the repair target portion of the bridge, The sandblasting operation can be performed only by connecting to the compressor 61 via the connection pipe 62.

  Hereinafter, each component of the blast device 1 will be described in more detail.

  The tank 2 is a resin container made of a plastic bottle or the like in which the abrasive material S is stored. The tank 2 includes a space 2c in which the abrasive S is accommodated, an introduction port 2a for introducing air for pressurizing the abrasive S into the tank 2, and an exhaust for discharging the abrasive and air. And an outlet 2b. The inlet 2 a is formed at the upper end of the tank 2, and the outlet 2 b is formed at the bottom of the tank 2.

  The tank 2 accommodates a grinding material S made of normal sandblasting sand (sand, glass, alumina, etc.). The tank 2 only needs to withstand a pressure of about 0.8 MPa necessary for injecting the abrasive S. As the tank 2 of the present embodiment, for example, a 1.5 liter PET bottle (that is, a bottle made of polyethylene terephthalate resin) is employed. In addition, since the design pressure resistance of the PET bottle is about 1.0 MPa, the PET bottle can withstand the working pressure of about 0.8 MPa. When a 1.5 liter PET bottle is employed as the tank 2, the total capacity of the four tanks 2 is 6 liters. The four tanks 2 are stored in the case 3 in a state of being placed on the pedestal 25.

  The capacity of the tank 2 is not particularly limited, but for example, in order to adjust the local substrate of a huge structure such as a bridge, it is considered to reduce the number of fillings of the abrasive S as much as possible. In this case, the total capacity of the tank 2 inside the case 3 is preferably about 2 to 10 liters.

  The case 3 is a container that contains four tanks 2 and is made of a material harder than the tank 2. The case 3 is made of, for example, a rectangular parallelepiped aluminum hard case or an aluminum trunk case. The case 3 includes a case main body 3a and a lid 3b. The case main body 3a is a hollow box and has a space 3c for accommodating four tanks 2 and the like. A handle 3e is provided on the upper surface 3d of the case body 3a for the operator to hold. Further, a through hole 3j (see FIG. 5) through which the hose 4 passes is formed in the upper surface 3d. The lid 3b is attached to the outer peripheral edge of the opening 3f of the case body 3a through a hinge 3g (see FIG. 2) so as to be opened and closed. Further, the lid 3b can firmly close the opening 3f of the case body 3a by the stopper 3h.

  As shown in FIG. 2, a buffer sheet 27 made of a sponge plate or the like is attached to the inner peripheral surface of the case body 3 a and the inner surface of the lid 3 b as a buffer material that reduces the impact from the side received by the tank 2. ing. Thereby, it is possible to avoid that the tank 2 made from a plastic bottle contacts and damages the inner surface of the case 3 having high rigidity.

  Further, as shown in FIGS. 2, 4, and 6 to 7, a pedestal 25 for placing the tank 2 is accommodated inside the case 3. The pedestal 25 is a hollow pyramid made of resin for weight reduction, and the lower surface side of the pedestal 25 is open. The junction pipe 19 connected to the bottom of the tank 2 passes through the upper surface of the pedestal 25 and is accommodated inside the pedestal 25. The junction connector 20 connected to the junction pipe 19 is also accommodated in the pedestal 25. Therefore, since the junction pipe 19 and the junction connector 20 are covered by the base 25, it is possible to avoid the possibility that the junction pipe 19 and the junction connector 20 are damaged by receiving a pressing force from the tank 2 or the case 3. is there.

  Further, the four tanks 2 are fixed on the upper surface of one common pedestal 25 by bolts 28 (see FIG. 7) or the like that are screwed into the upper end portion of the junction pipe 19. Thereby, when the abrasive material S is replenished to the tank 2, it is possible to easily take out the plurality of tanks 2 from the case 3.

  Further, a cushioning sheet 26 made of rubber or the like is provided between the bottom of the tank 3 and the pedestal 25 as a cushioning material that relieves shock from below that the tank 3 receives. Thus, the buffer sheet 26 can prevent the tank 2 made of PET bottles from being damaged by being directly impacted from below through the base 25. The buffer sheet 26 is made of, for example, a sponge sheet. In the buffer sheet 26, a plurality of slits 26a (see FIG. 6) are formed side by side, and the merging pipe 19 passes through the slit 26a.

  Moreover, since the adhesive sheet 30 (refer FIG. 2 and FIG. 6) is affixed between the tanks 3, the tanks 3 are prevented from contacting each other while being fixed so as not to be separated from each other. .

  As shown in FIG. 1 and FIGS. 3 to 4, the hose 4 has an inlet side end portion 4 a and an outlet side end portion 4 b. The inlet side end portion 4a of the hose 4 communicates with the discharge port 2b of the tank 2 via the abrasive material conveying unit 10 (that is, the merging pipe 19, the merging connector 20, and the abrasive material supply pipe 21) and the merging part 12. doing. The outlet side end 4b of the hose 4 is disposed outside the case 3 and is connected to the nozzle 5. The hose 4 is a thin and flexible tube that extends to the outside of the case 3 and is made of a highly flexible resin such as urethane resin.

  As shown in FIGS. 9 to 10, the nozzle 5 can be connected to the outlet side end 4 b of the hose 4, and has a shape that is small and easy to hold by hand. Specifically, the nozzle 5 includes a cylindrical nozzle body 51, a hose terminal member 52 connected to the outlet side end 4 b of the hose 4, and a connecting member that connects the hose terminal member 52 and the nozzle body 51. 53.

  The nozzle body 51 has an elongated cylindrical shape and becomes thinner toward the tip. A nozzle 50 is opened at the tip of the nozzle body 51.

  The hose terminal member 52 has a cylindrical shape that can be fixed to the outer peripheral portion of the outlet side end portion 4b of the hose 4, and an insertion hole 52a into which the hose 4 can be inserted is formed therein. Further, a male screw part 52 b is formed on the outer peripheral surface of the hose terminal member 52. Further, the hose terminal member 52 has an end surface 52c facing the inlet side end 51a of the nozzle body 51 so that the outlet side end 4b of the hose 4 can be abutted against the inlet side end 51a of the nozzle body 51. Have.

  A portion of the outlet side end 4 b of the hose 4 that protrudes from the end surface 52 c through the hose terminal member 52 is abutted against the inlet side end 51 a of the nozzle body 51. The portion is processed so as to be a tongue 4b1 that expands in a bell mouth shape outwardly in the radial direction of the hose 4 so that the inner peripheral surface of the hose 4 abuts on the inlet side end 51a.

  The connecting member 53 is made of a cylindrical member, and the inlet side end 51a of the nozzle body 51 is fitted therein. Furthermore, a female screw portion 53 c that can be screwed into the male screw portion 52 b of the hose terminal member 52 is formed on the inner peripheral surface 53 b of the connecting member 53.

  The connecting member 53 has its female threaded portion 53c screwed into the male threaded portion 52b of the hose terminal member 52 so that the tongue portion 4b1 formed at the tip of the outlet side end portion 4b of the hose 4 becomes the inlet of the nozzle body 51. It is possible to connect the hose terminal member 52 and the nozzle body 51 in a state where the hose terminal member 52 is in contact with the side end 51a. In FIG. 9, in order to more clearly show the shape of the tongue 4b1, the state where the tongue 4b1 is slightly separated from the inlet side end 51a of the nozzle body 51 is shown. Is used in a state in which the tongue portion 4 b 1 is in contact with the inlet side end portion 51 a of the nozzle body 51.

  The nozzle 5 configured as described above has such a size that an operator can hold it by hand. Moreover, since the nozzle 5 does not have a tank or the like for storing the abrasive material S for blasting, its outer shape is simple and does not protrude. Therefore, as shown in FIG. 10, the operator pinches the connecting member 53 of the nozzle 5 with the finger F and connects the injection port 50 at the tip of the nozzle 5 to the corner portion such as the bolt fastening point P of the bridge A or the narrow portion. Since it can be easily directed to a location, blasting can be performed in a deep location as long as it is within the reach of the operator.

  As shown in FIGS. 1 to 5, the connecting portion 6 has a shape that can be detachably connected to a connecting pipe 62 that leads to a compressor 61 outside the case 3. The connecting portion 6 communicates with the inlet 2 a of the tank 2 via the pressure regulating valve 7, the distributing portion 8 and the compressed air supply portion 9.

  The pressure regulating valve 7 is a valve that regulates the pressure of the compressed air sent from the compressor 61 to a pressure that can be used by the blasting apparatus 1 and stabilizes the pressure. The pressure regulating valve 7 is attached to the outer side surface of the case 3. The connecting portion 6 is integrally connected. Note that the pressure regulating valve 7 may be arranged in the middle of the introduction pipe 13 away from the connection portion 6.

  As shown in FIGS. 3 to 4, a distributor 8 is connected to the downstream side of the pressure regulating valve 7. The distribution section 8 is connected to an introduction pipe 13 that communicates with the tank 2 and a bypass pipe 22 that bypasses the tank 2 and is connected to the junction section 12. The compressed air whose pressure is adjusted by the pressure adjusting valve 7 is distributed to the introduction pipe 13 and the bypass pipe 22 by the distributor 8.

  As shown in FIGS. 3 to 5, the compressed air supply unit 9 includes an introduction pipe 13 for introducing compressed air connected to the distribution unit 8, a grinding material flow rate adjusting valve 14, a three-way valve 15, a ball valve 16, A distribution connector 17 and distribution pipes 18 branched from the distribution connector 17 and respectively connected to the introduction ports 2a of the four tanks 2 are provided. The abrasive flow rate adjusting valve 14, the three-way valve 15, the ball valve 16, and the distribution connector 17 are sequentially arranged in the introduction pipe 13 from the upstream side.

  The abrasive flow rate adjusting valve 14 is provided on the outer surface of the case 3, specifically on the upper surface 3 d, between the connecting portion 6 and the tank 2, specifically between the distributing portion 8 and the distributing connector 17. The inlet pipe 13 is provided. The abrasive flow rate adjusting valve 14 adjusts the flow rate of the abrasive material S sent from the tank 2 to the hose 4 by adjusting the pressure of the compressed air supplied from the compressor 61 to the tank 2 via the introduction pipe 13.

  The three-way valve 15 is a valve capable of switching between a conduction state in which the compressed air passing through the introduction pipe 13 is conducted and a cutoff state in which the compressed air is cut off. The compressed air supplied from the compressor 61 to the tank 2 in the cutoff state. Is provided with a gas vent 15a through which the excess pressure after the blasting operation is released can be released. The three-way valve 15 is disposed downstream of the abrasive flow rate adjusting valve 14 in the introduction pipe 13 on the upper surface 3 d of the case 3. The three-way valve 15 corresponds to the switching unit of the present invention.

  The ball valve 16 is a valve capable of switching between a conduction state in which compressed air is conducted and a cutoff state in which the compressed air is cut off by opening and closing the introduction pipe 13 and corresponds to the opening / closing portion of the present invention. The ball valve 16 is disposed downstream of the three-way valve 15 on the upper surface 3 d of the case 3 and between the three-way valve 15 and the tank 2. Further, in order to complement the function of adjusting the abrasive flow rate by the abrasive flow rate adjustment valve 14, the flow rate of the compressed air introduced into the tank 2 is finely adjusted by finely adjusting the opening of the ball valve 16. As a result, it is possible to finely adjust the flow rate of the abrasive S sprayed from the nozzle 5 during the blasting operation.

  The distribution connector 17 is provided at the downstream end of the introduction pipe 13. As shown in FIGS. 3 to 4, upstream ends of four distribution pipes 18 are connected to the distribution connector 17. The downstream end of the distribution pipe 18 is connected to the inlet 2 a on the upper end side of the tank 2.

  The abrasive transport unit 10 includes a joining pipe 19 connected to the discharge ports 2 b of the four tanks 2, a joining connector 20 that joins the four joining pipes 19, and a grinding material from the joining connector 20 to the joining section 12. And an abrasive supply pipe 21 for supplying S together with compressed air. The abrasive supply pipe 21 is a pipe that conveys the abrasive S, and connects between the confluence connector 20 and a confluence section 12 described later.

  The bypass unit 11 includes a bypass pipe 22, a bypass air flow rate adjustment valve 23, and a ball valve 24.

  The bypass pipe 22 bypasses the tank 2 and communicates between the connection portion 6 and the hose 4, specifically, between the distribution portion 8 and the junction portion 12. Compressed air supplied from the compressor 61 flows inside the bypass pipe 22.

  As shown in FIG. 4, a portion 22 a between the ball valve 24 and the merging portion 12 in the bypass pipe 22 is accommodated inside the case 3. The entire bypass pipe 22 may be accommodated in the case 3.

  The bypass air flow rate adjustment valve 23 is provided in the bypass unit 11 and adjusts the pressure of the compressed air supplied to the hose 4 through the bypass unit 11. The bypass air flow rate adjustment valve 23 corresponds to the bypass gas flow rate adjustment unit of the present invention.

  The ball valve 24 is a valve capable of switching between a conduction state in which compressed air is conducted and a cutoff state in which the compressed air is cut off by opening and closing the bypass pipe 22. The ball valve 24 is disposed on the downstream side of the bypass air flow rate adjustment valve 23.

  The bypass unit 11 can send high-speed bypass air in the direction of the nozzle 5 via the merging unit 12.

  As shown in FIGS. 3 to 4, the joining portion 12 is a portion that mixes the compressed air flowing through the bypass portion 11 and the compressed air containing the abrasive S flowing through the abrasive supply pipe 21. That is, the merging portion 12 includes a first input portion 12 a connected to the downstream end of the bypass portion 11, a second input portion 12 b connected to the downstream end of the abrasive supply pipe 21, and an inlet side end portion of the hose 4. And an output unit 12c connected to 4a. After the compressed air flowing through the bypass portion 11 and the compressed air containing the abrasive S flowing through the abrasive supply pipe 21 are mixed by the merging portion 12, the mixed abrasive S and compressed air are supplied to the hose 4. .

  As shown in FIGS. 2 to 3 and FIG. 5, in the blast device 1 of the present embodiment, valves of the compressed air supply unit 9 and the bypass unit 11, that is, an abrasive flow rate adjustment valve 14, a three-way valve 15, a ball valve. 16, since the bypass air flow rate adjusting valve 23 and the ball valve 24 are concentrated on the upper surface 3d of the case 3, the operator can inject these abrasives S from the nozzle 5 and perform the blasting operation. The valve can be easily operated. In addition, the risk of these valves hitting an obstacle while moving the blasting device 1 is reduced.

  The compressor 61 arranged outside the case 3 is connected to the connection portion 6 via the connection pipe 62. The compressed air sent from the compressor 61 via the connection pipe 62 is lowered to the pressure resistance (0.8 MPa or less) of the PET bottle tank 2 by the pressure regulating valve 7 and then repaired by the abrasive flow rate regulating valve 14. It is possible to supply compressed air of about 0.1 to 0.8 MPa into the tank 2 by finely adjusting the flow rate according to the conditions of the location.

(Air flow inside the blasting device 1)
In the above blast device 1, air flows through the following path. First, as shown in FIG. 3, the compressed air generated by the compressor 61 is supplied from the connecting portion 6 of the blasting apparatus 1 via the connecting pipe 62. The compressed air supplied from the connecting part 6 is depressurized by the pressure regulating valve 7 and then flows into the introduction pipe 13 and the bypass pipe 22.

  The compressed air flowing through the introduction pipe 13 is adjusted to a predetermined flow rate by the abrasive flow rate adjusting valve 14, and then passes through the three-way valve 15 ball valve 16 and the distribution connector 17, and then the distribution pipe 18 connected to the distribution connector 17. To 4 tanks 2 respectively. The abrasive S accommodated in the four tanks 2 joins with the compressed air to the abrasive supply pipe 21 via the junction pipe 19 and the junction connector 20. The abrasive S and the compressed air that flow through the abrasive supply pipe 21 are guided to the merging section 12.

  On the other hand, the compressed air flowing through the bypass unit 11 is adjusted to a predetermined flow rate by the bypass air flow rate adjusting valve 23, then passes through the ball valve 24 and is guided to the merging unit 12. In the merging portion 12, the abrasive S and the compressed air flowing through the abrasive supply pipe 21 are mixed with the compressed air flowing through the bypass portion 11.

  Then, the abrasive S and the compressed air mixed at a predetermined mixing ratio in the merging portion 12 are jetted from the nozzle 5 via the hose 4.

(Explanation of local repair method for bridges)
Next, a method for locally repairing a bridge using the blast device 1 configured as described above will be described.

  A local repair method for a bridge according to the present embodiment is a local repair method for removing rust generated locally in a bridge using the blasting device 1 described above, and includes a conveying step, a blast step, and an abrasive. A flow rate adjusting step.

  Specifically, first, the tank 2 containing the abrasive S is accommodated in the case 3 and valves (that is, the abrasive flow rate adjusting valve 14, the three-way valve 15, the ball valve 16, the bypass air flow rate adjusting valve 23 and the ball By providing the valve 24) on the upper surface 3d of the case 3, the blasting device 1 is transported to the vicinity of the repair target portion of the bridge in a state where the tank 2 and the above valves are combined into one case 3. (Conveying process). The repair target location is a location where a normal repair tool or the like is difficult to enter, and it is difficult to perform the repair work, for example, a corner portion or a narrow location such as the vicinity of the bolt fastening location of the bridge A as shown in FIG.

  Next, the connecting pipe 62 connected to the compressor 61 is connected to the connecting portion 6 of the blasting apparatus 1, and the operator holds the nozzle 5 while holding the connecting member 53 of the nozzle 5 with the finger F as shown in FIG. 10. By injecting the abrasive S toward the repair target site such as the bolt fastening site P, the rust at the repair target site is locally removed (blasting process).

  In the blasting process, pressure is applied to the abrasive S by pumping compressed air from the compressor 61 outside the case 3 to the inside of the tank 2 through the connection portion 6, so that the tank 2 is discharged from the outlet 2 b of the tank 2. The inside abrasive material S is discharged to the outside of the tank 2 together with the compressed air, and the abrasive material S and the compressed air discharged to the outside of the tank 2 are combined with the compressed air that has passed through the bypass portion 11 at the junction 12. After mixing, the mixed abrasive S and compressed air are sent to the nozzle 5 via the hose 4. As a result, the abrasive S inside the tank 2 can be ejected from the nozzle 5.

  When performing this blasting process, specifically, the valves of the blasting apparatus 1 are operated in the following procedure.

  First, as shown in FIG. 8A, the operation of opening the ball valve 24 of the bypass portion 11 arranged on the upper surface 3d of the case 2 is performed to make the bypass pipe 22 conductive, and only compressed air is supplied from the nozzle 5. Discharge. At this time, the ball valve 16 of the compressed air supply unit 9 for supplying compressed air to the tank 2 is closed.

  Next, as shown in FIG. 8B, the three-way valve 15 and the ball valve 16 of the compressed air supply unit 9 disposed on the upper surface 3d of the case 2 are opened with the nozzle 5 facing the repair target portion. The introduction pipe 13 is brought into a conducting state and compressed air is sent into the tank 2, whereby the abrasive S is pressure-fed from the tank 2 to the nozzle 5. As a result, the abrasive S fed by pressure from the tank 2 and the compressed air that has passed through the bypass portion 11 are mixed inside the merging portion 12 and then jetted from the nozzle 5 to perform the blasting process on the repair target portion.

  While performing the blasting process as described above, the operator observes the state of rust removal at the repair target location and observes the abrasive flow rate adjustment valve 14 and the bypass air flow rate adjustment valve 23 installed on the upper surface 3d of the case 2. Is adjusted so that the mixing ratio of the abrasive S and the compressed air injected from the nozzle 5 is changed. In this way, the flow rate of the abrasive S sent from the tank 2 to the hose 4 is optimally adjusted (adjustment process).

  After the blasting operation is finished, as shown in FIG. 8C, first, the ball valve 16 on the upstream side of the tank 2 is closed, and the supply of the abrasive S to the nozzle 5 is stopped. At this time, the ball valve 24 of the bypass unit 11 is kept open, and the compressed air is continuously injected from the nozzle 5 through the bypass pipe 22 and the merging unit 12. As the compressed air continues to flow through the merging portion 12 as described above, the abrasive S remaining in the merging portion 12 and the hose 4 on the downstream side can be discharged from the nozzle 5.

  Thereafter, as shown in FIG. 8 (d), the three-way valve 15 is closed and the gas vent 15a (see FIG. 3) is opened to prepare for opening the introduction pipe 13 to the atmosphere. By opening the ball valve 16, the internal pressure of the tank 2 can be returned to atmospheric pressure.

  In addition, since the compressed air in the bypass unit 11 flows into the tank 2 through the merging unit 12 at the same time as the ball valve 16 is opened, the abrasive material conveying unit 10 between the tank 2 and the merging unit 12 (that is, the merging pipe 19, The grinding material S remaining in the joining connector 20 and the grinding material supply pipe 21) flows back into the tank 2 and returns. At this time, by gradually closing the ball valve 24 of the bypass section 11, the section from the ball valve 24 to the merging section 12 and the section from the tank 2 to the merging section 12 can be returned to atmospheric pressure. .

(Feature)
(1)
In the blast apparatus 1 for civil engineering structure repair according to the present embodiment, a resin tank such as a plastic bottle is adopted as the tank 2 for storing the abrasive material S, and compared with a pressure vessel made of conventional steel or the like. Light weight. For this reason, the operator can easily carry the case 3 in which the tank 2 is stored to the vicinity of the repair target portion of the bridge. In addition, since the weight-reduced tank 2 is stored in the case 3, it is avoided that the tank 2 directly contacts a civil engineering structure such as a bridge. Is reduced. Further, after such a tank 2 is stored in the case 3 and transported to the vicinity of the repair target location, a compressor 61 such as a compressor disposed outside the case 3 is connected to the connection portion 6, and the connection portion 6 It is possible to directly supply the compressed air supplied from the compressor 61 to the tank 2 via the. Thereby, the grinding material S and compressed air in the tank 2 are sprayed toward the repair target location through the hose 4 and the nozzle 5 connected to the tank 2 to locally remove rust in the repair target location. Is possible. As a result, it is possible to reliably remove rust generated at the repair target location in the civil engineering structure. Further, since the abrasive S is sprayed directly, that is, the abrasive S in the tank 2 is pressurized by compressed air, and the abrasive S is injected through the nozzle 5, so that the abrasive regardless of the direction of the nozzle 5. S can be stably supplied at a predetermined flow rate, and stable local repair work is possible.

  In addition, since the abrasive flow rate adjusting valve 14 for adjusting the flow rate of the abrasive material S is provided on the outer surface of the case 3, depending on various conditions such as the material and state of the repair target portion during local repair work. Thus, the flow rate of the abrasive S can be easily adjusted. Therefore, it is possible to reliably remove rust at the repair target portion while suppressing consumption of the abrasive S.

  Furthermore, if the blasting apparatus 1 as described above is used, the amount of scattered abrasive material S is small compared with the case of blasting a wide range of floor surfaces and wall surfaces using a conventional large blasting apparatus. The abrasive material S can be easily recovered by locally surrounding the target portion with a plastic bag or the like.

(2)
Further, in the blasting apparatus 1 of the present embodiment, since the three-way valve 15 having the gas vent 15a that opens the pressure inside the tank 2 to the outside of the tank 2 in the shut-off state is provided, the repair work is completed. The operator later operates the three-way valve 15 on the outer surface of the case 3 to block the flow of compressed air between the connecting portion 6 and the tank 2 and to release the pressure remaining in the tank 2 to the atmosphere through the gas vent. Thus, it is possible to reduce the amount of the abrasive S leaking from the nozzle 5 due to the pressure remaining in the tank 2.

(3)
Moreover, in the blasting apparatus 1 of this embodiment, it is the structure by which the grinding material flow volume adjustment valve 14 is arrange | positioned at the inlet pipe 13 arrange | positioned between the connection part 6 and the tank 2, and the three-way valve 15 is an inlet pipe. 13, the three-way valve 15 shuts off the introduction pipe 13 and releases the pressure inside the tank 2 to the outside of the tank 2 through the gas vent 15 a. Even if a small amount of grinding material S flows back from the tank 2 together with the compressed air through the introduction pipe 13, the grinding material S does not reach the grinding material flow rate adjustment valve 14, and the gas vent of the three-way valve 15 on the downstream side thereof. It is possible to discharge from 15a to the outside. Accordingly, it is possible to avoid the possibility that the grinding material S flows backward to the grinding material flow rate adjustment valve 14. As a result, the grinding material S enters the grinding material flow rate adjustment valve 14 and the operation of the grinding material flow rate adjustment valve 14. Abnormality and damage can be avoided.

(4)
Further, the blasting apparatus 1 of the present embodiment further includes a ball valve 16 provided on the outer surface of the case 3 for opening and closing the introduction pipe 13. The ball valve 16 is downstream of the three-way valve 15 in the introduction pipe 13. Since it is disposed between the three-way valve 15 and the tank 2, the operator operates the ball valve 16 on the outer surface of the case 3 after the repair work is completed. It is possible to block the flow of the compressed air by the ball valve 16 on the downstream side of the three-way valve 15. As a result, during switching operation of the three-way valve 15, it is possible to avoid the possibility that the abrasive S flows backward through the introduction pipe 13 together with the compressed air and bites into the three-way valve 15, and avoids abnormal operation or damage of the three-way valve 15. Is possible.

(5)
Moreover, in the blasting apparatus 1 of this embodiment, since the bypass pipe 22 bypasses the tank 2 and communicates between the connecting portion 6 and the hose 4, the abrasive S directed from the tank 2 to the hose 4 is transferred to the bypass pipe 22. It is possible to mix inside the hose 4 with the compressed air passing through the connection 6 from the connection 6. Thereby, since it becomes possible to dilute the grinding material S moderately with the compressed air that has passed through the bypass pipe 22 and to inject the grinding material S to the repair target location, while suppressing excessive outflow of the grinding material S, The grinding material S can be injected in an optimum amount according to the material and state of the repair target portion. Further, since the compressed air passing through the bypass pipe 22 joins the abrasive S and the hose 4 and accelerates the abrasive S, the pressure applied to the tank 2 to increase the injection speed of the abrasive S at the outlet of the nozzle 5 is increased. It is not necessary to raise it excessively. As a result, it is possible to reliably inject the abrasive S within the pressure resistance of the resin tank 2 made of a PET bottle.

(6)
Moreover, in the blast apparatus 1 of this embodiment, since the bypass pipe 22 is stored inside the case 3, there is a low possibility that the bypass pipe 22 will come into contact with the civil engineering structure when the case 3 is carried. Even better.

(7)
Further, in the blasting apparatus 1 of the present embodiment, the flow rate of the compressed air supplied to the hose 4 via the bypass pipe 22 is adjusted by the bypass air flow rate adjusting valve 23. Depending on conditions, the flow rate of the compressed air flowing through the bypass pipe 22 can be optimally adjusted. Moreover, since the bypass air flow rate adjusting valve 23 is provided on the outer surface of the case 3, it is possible to easily adjust the flow rate of the compressed air flowing through the bypass pipe 22 during local repair work.

(8)
Further, in the blasting apparatus 1 of the present embodiment, the hose terminal member 52 and the nozzle body are formed in a state in which the bell mouth-like tongue 4b1 formed at the end of the hose 4 is in contact with the inlet side end 51a of the nozzle body 51. 51 is connected by the connecting member 53, so that even the thin hose 4 can be connected to the nozzle body 51 while maintaining the sealing performance in a state of being in contact with the end of the nozzle body 51. As a result, it is possible to employ a thin hose 4 that is easier to bend than a thick hose 4, and as a result, it is possible to easily direct the nozzle 5 connected to the hose 4 to rust at a repair target location.

(9)
Further, in the blasting apparatus 1 of the present embodiment, since the buffer sheet 27 is provided between the inner surface of the case 3 and the tank 2, when the tank 2 collides with the case 3 during the movement of the tank 2 or the like. Can be mitigated by the buffer sheet 27, and damage to the resin tank 2 made of a plastic bottle can be reliably prevented.

(10)
Moreover, in the civil engineering structure repair method using the blasting apparatus 1 of this embodiment, the powdery abrasive S is accommodated in the resin tank 2 made of a plastic bottle that is lighter than a pressure vessel made of steel or the like. The tank 2 and the valves (that is, the abrasive flow rate adjusting valve 14, the three-way valve 15, the ball valve 16, the bypass air flow rate adjusting valve 23 and the ball valve 24) are combined into one case 3, and the case 3 Is transported to the vicinity of the repair target part of the civil engineering structure, the tank 2 containing the abrasive S is easily moved, and the workability of the repair work is greatly improved. Further, since the weight-reduced tank 2 is accommodated in the case 3, it is avoided that the tank 2 is in direct contact with a civil engineering structure or the like during transportation. Is reduced. The tank 2 is transported to the vicinity of the repair target in a state where the tank 2 is accommodated in the case 3, and then the compressed air is pumped from the compressor 61 outside the case 3 to the tank 2, whereby the abrasive S inside the tank 2 and It is possible to locally remove rust in the repair target portion by injecting the compressed air toward the repair target portion through the hose 4 and the nozzle 5 connected to the tank 2. As a result, it is possible to reliably remove rust generated at the repair target location in the civil engineering structure. Further, since the abrasive S is sprayed directly, that is, the abrasive S in the tank 2 is pressurized by compressed air, and the abrasive S is injected through the nozzle 5, so that the abrasive regardless of the direction of the nozzle 5. S can be stably supplied at a predetermined flow rate, and stable local repair work is possible. Further, when the abrasive material S is sprayed from the nozzle 5 as described above to perform local repair work, the object to be repaired is operated by operating the abrasive material flow rate adjusting valve 14 provided on the outer surface of the case 3. It is possible to easily adjust the flow rate of the abrasive S according to various conditions such as the material and state of the part. Therefore, it is possible to reliably remove rust at the repair target portion while suppressing consumption of the abrasive S.

(11)
Moreover, in the civil engineering structure repair method of this embodiment, the civil engineering structure to be repaired is a bridge, and the repair target portion is a narrow portion or a corner portion of the bridge. Therefore, in such a bridge, the tank 2 containing the abrasive S is transported to the corners or narrow places where it has been difficult to adjust the base material for repair coating, and the abrasive S discharged from the tank 2 and By jetting compressed air from the nozzle 5 to these corners and narrow places, it is possible to locally and reliably remove rust at places where repair tools or the like are difficult to enter in the bridge. Moreover, it is possible to suppress the consumption of the abrasive material S by locally injecting the abrasive material S to the corners and narrow portions of the bridge.

(Modification)
(A)
In the above-described embodiment, a resin tank such as a PET bottle has been described as an example. However, the present invention is not limited to this, and a capacity (for example, a tank capacity) that can accommodate a certain amount of abrasive material. For example, a tank made of light metal may be adopted as a tank other than the resin as long as it has a total capacity of about 2 to 10 liters) and has a strength capable of withstanding the necessary injection pressure.

(B)
In the above embodiment, the local repair method for the bridge has been described as an example of the local repair method for the civil engineering structure according to the present invention. However, the present invention is not limited to this, and is fixed to the land. If it is a large-sized civil engineering structure, it becomes a target to which the local repair method of the present invention is applied. For example, the local repair method of the present invention can be applied to rusty parts such as buildings and plants.

(C)
In the present embodiment, as an example of the pressurizing gas supplied to the tank 2 for injecting the abrasive, the compressed air has been described as an example. However, the present invention is not limited to this and other than air. Alternatively, a gas such as nitrogen may be used.

DESCRIPTION OF SYMBOLS 1 Blast apparatus 2 for civil engineering structure repair 2 Tank 3 Case 4 Hose 5 Nozzle 6 Connection part 14 Grinding material flow rate adjustment valve 15 Three-way valve (switching part)
16 Ball valve (opening / closing part)
22 Bypass pipe 23 Bypass air adjustment valve (Bypass gas flow rate adjustment part)
61 Compressor (Gas pressure source)
62 Connection piping S Grinding material S

Claims (10)

A blast device for repairing civil engineering structures that removes rust by injecting abrasives against rust that occurs locally in civil engineering structures,
A resin or light metal tank that contains the abrasive, and a space that contains the abrasive, and an inlet for introducing a gas for pressurizing the abrasive into the tank. At least one tank having the abrasive and an outlet for discharging the gas;
A case for storing so as to cover the tank;
A connection portion having a shape connectable to a gas pressurizing source for pressurizing the gas disposed outside the case, and communicating with the inlet of the tank;
A hose having an upstream end and a downstream end, the upstream end communicating with the outlet, and the downstream end disposed outside the case;
A nozzle connected to the downstream end of the hose;
An abrasive flow rate adjusting unit that is provided on the outer surface of the case and adjusts the flow rate of the abrasive sent from the tank to the hose;
With
A blasting apparatus for repairing civil engineering structures characterized by that. Provided on the outer surface of the case, and can be switched between a conduction state allowing the gas flow between the connecting portion and the tank and a blocking state blocking the gas flow, and the blocking state. A switching part having a gas vent for releasing the pressure inside the tank to the outside of the tank at the time of
The blasting apparatus for civil engineering structure repair according to claim 1. The abrasive flow rate adjustment unit is disposed in a gas flow path between the connection unit and the tank, and adjusts the flow rate of gas sent from the connection unit to the tank, thereby supplying the abrasive to the hose. Adjusting the flow rate of the abrasive material,
The switching unit is disposed downstream of the abrasive flow rate adjusting unit in the gas flow channel and is disposed in the gas flow channel between the abrasive flow rate adjusting unit and the tank.
The blasting apparatus for civil engineering structure repair according to claim 2. Provided on the outer surface of the case, further comprising an opening and closing portion for opening and closing the gas flow path;
The opening / closing part is disposed downstream of the switching part in the gas flow path and is disposed in the gas flow path between the switching part and the tank.
The blast device for civil engineering structure repair according to claim 3. Further comprising a bypass flow path that bypasses the tank and communicates between the connecting portion and the hose;
The blast apparatus for civil engineering structure repair in any one of Claim 1 to 4. The bypass flow path is stored inside the case.
The blast apparatus for civil engineering structure repair according to claim 5. Provided on the outer surface of the case, further comprising a bypass gas flow rate adjusting unit for adjusting the flow rate of the gas supplied to the hose via the bypass flow path;
The blasting apparatus for civil engineering structure repair according to claim 5 or 6. The nozzle is
A cylindrical nozzle body;
A hose terminal member fixed to the outer peripheral portion of the end portion of the hose, and abutting the end portion of the hose with the inlet side end portion of the nozzle body;
A connecting member that connects the hose terminal member and the nozzle body;
The portion of the end of the hose that is abutted against the inlet side end of the nozzle body expands in a bell mouth shape outwardly in the radial direction of the hose so that the inner peripheral surface of the hose contacts the inlet side end. Tongue
8. The connecting member according to claim 1, wherein the connecting member connects the hose terminal member and the nozzle body in a state where the tongue portion of the hose end is in contact with the inlet side end of the nozzle body. Blasting device for civil engineering structure repair described in 1. A buffer material is provided between the inner surface of the case and the tank.
The blasting apparatus for civil engineering structure repair according to any one of claims 1 to 8. A civil engineering structure repair method using the civil engineering structure repair blast device according to claim 1,
In a state where the tank and the abrasive flow rate adjusting unit are combined into one case by storing the tank containing the abrasive material in the case and providing the abrasive flow rate adjusting unit on the outer surface of the case. , A transporting process for transporting the case to the vicinity of the repair target location of the civil engineering structure,
By applying pressure to the abrasive by pumping gas from the gas pressurization source outside the case to the inside of the tank through the connection portion, the abrasive inside the tank from the discharge port of the tank Is discharged to the outside of the tank together with the gas, and further, the abrasive and gas discharged to the outside of the tank are sent to a nozzle connected to the hose via a hose communicating with the discharge port of the tank, A blasting step for locally removing rust in the repair target part by spraying the abrasive from the nozzle toward the repair target part,
An adjustment step of adjusting the flow rate of the abrasive material sent from the tank to the hose by operating the abrasive flow rate adjustment unit provided on the outer surface of the case;
Civil engineering structure repairing method characterized by including.

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