JP2005238176A - Apparatus for applying sulfur spray material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a solidified body coating film having uniform thickness by spraying molten sulfur with an air pressure on the surface of a structure without solidifying. <P>SOLUTION: This apparatus for applying sulfur spray material is provided with a compressed air producing means 1, a means 2 for heating compressed air, a means 3 for storing the molten sulfur at a prescribed temperature while keeping a molten state, a fixed quantity discharge means 5 for successively sending sulfur to a mixing part 4 provided in a flow passage of heated compressed air and a jetting nozzle 7 provided at the tip of the mixing part 3. The solidified body coating film having a prescribed thickness is formed on the surface of the structure by spraying the molten sulfur particles jetted from the tip of the nozzle 7 on the surface of the concrete structure 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an anticorrosion method using sulfur, and more particularly to an apparatus for coating molten sulfur on a target construction surface by spraying.

  Cement concrete has been widely used as an economical structural material with long-term durability, but recently, the structure of sewerage facilities has been corroded at a relatively early stage, which is caused by bacteria in the sewerage system. It has been found that this is due to the sulfuric acid produced by the work.

  As measures to prevent these corrosions, especially in highly corrosive environments such as sewer facilities, a method of protecting the concrete structure surface by a method of forming a corrosion protection layer with concrete, a coating type lining method, a sheet lining method, etc. Has been put to practical use.

  By the way, in the formation method of the anticorrosion layer by concrete, since the concrete itself used as an anticorrosion layer corrodes, periodic repair is required. In addition, since the thickness of the anticorrosion layer is required in addition to the necessary structural member thickness, there has been a problem that the thickness of the structure becomes unnecessarily thick.

  In contrast, the coating type lining method and the sheet lining method ensure the corrosion resistance of the lining material itself. However, the materials used have a very different linear expansion coefficient compared to concrete and have poor adhesion to concrete, such as low adhesion, which causes problems such as peeling, which can be caused by pinholes and joints. There was a problem that corrosion progressed.

  By the way, the present inventors are excellent in water barrier properties, acid resistance, and alkali resistance in the form of sulfur, a modified sulfur simple substance obtained by adding and mixing an olefin polymer to sulfur, or a mixture of this and an inorganic additive. In addition, it was confirmed that the blending with the concrete was good, and the coating on the surface of the concrete structure formed an inexpensive and tough anti-corrosion solidified coating.

  As a concrete construction method, if sulfur is heated above its melting point, it can be fluidized and a solidified coating film can be formed by cooling. For example, a mold is formed facing an existing structure, and molten sulfur is formed inside it. Can be integrated into an existing structure, but the operation is extremely complicated, and requires a lot of work and cost.

  On the other hand, a coating method can be considered as the simplest construction method. However, when a flow-down method such as sprinkling molten sulfur using a handle or the like is adopted as a coating method, it is difficult to construct a uniform thickness, and the construction surface is limited to a horizontal or inclined surface. .

  In addition, in the spraying method using air pressure, the melting point or freezing point of sulfur is relatively low at about 110 ° C., so the sprayed molten sulfur immediately resolidifies and it is difficult to form a solidified coating on the construction surface. It was. Furthermore, when the temperature is raised to 160 ° C. or higher, sulfur itself is altered, so there is a limit to keeping the temperature high in order to prevent solidification.

  The present invention solves the above technical problem, and an object of the present invention is to make it possible to spray the fine particles of molten sulfur on the surface of the structure by air pressure without solidifying, and the temperature caused by contacting the surface of the structure. The present invention provides a method for coating a sulfur spraying material that can form a solidified film having a uniform thickness by the reduction.

  In order to achieve the above object, the apparatus of the present invention is a sulfur spraying material coating apparatus for forming a solidified coating film having a predetermined thickness on a surface of a structure by spraying molten sulfur particles on the surface of the concrete structure, and compressing it. An air generating means, a heating means for heating the compressed air generated by the compressed air generating means to a melting point of sulfur or higher, a storing means for storing molten sulfur alone or a mixture thereof while maintaining a molten state, and the storing means Characterized in that it comprises a fixed amount discharge means for sending the molten sulfur stored in the mixture or a mixture thereof into a mixing section provided in the flow path of the heated compressed air, and an injection nozzle provided at the tip of the mixing section. It is.

  In the present invention, the storage means has a storage tank body disposed inside a container, and the container is filled with oil on the outer periphery of the storage tank body and heated in the oil. The storage tank body is heated through the oil by the heating means, and the sulfur in the storage tank body is stored while being held in a molten state.

  The storage means preferably includes a hopper-shaped storage tank body, and the outer periphery thereof is preferably entirely covered with a heat insulating material and heating means.

  Moreover, it is preferable that the said fixed amount discharge means is a screw type or piston reciprocating type which can discharge the predetermined amount of molten sulfur according to the rotation speed by the rotational drive of a motor.

  The molten sulfur discharged in a fixed amount is atomized while being kept in a molten state by contacting high-temperature and high-pressure air in the mixing section and sprayed from the tip of the nozzle to the surface of the structure. It re-solidifies and forms a solidified coating.

  FIG. 1 shows a spray coating apparatus according to the present invention. In the figure, this coating apparatus includes a compressed air generating means 1, a compressed air heating means 2, a storage tank 3 for storing a mixture of molten sulfur and an inorganic additive in a molten state, and a lower part of the storage tank 3. Provided in a flow path of the heated compressed air, and a fixed discharge pump 5 that joins the mixing section 4 and a spray nozzle 7 connected to the tip of the mixing section 4 via a heat-resistant flexible hose 6. Yes.

  Specifically, the compressed air generating means 1 includes an air compressor 8, an air receiver 9 for accumulating pressure, a flow rate adjusting valve 10, a pressure gauge P, a flow meter FL, and the like.

  In the present embodiment, the heating means 2 is a system in which the outer periphery of the pressure-resistant and heat-resistant pipe 11 connected in the air flow path of the generated compressed air is heated by a burner 12 or the like, and here the melting point of sulfur is exceeded. Heated. The outer periphery of the heated air channel is supplied to the mixing unit 4 in a state of being covered with a heat insulating material and an electric heater 13 (portion indicated by hatching in the drawing). As the heating means 2, a heating chamber is provided in the air flow path of the compressed air, and a heating wire such as a nichrome wire is provided in the heating chamber to heat the compressed air. A scheme can be adopted. Reference numeral 14 is a relief valve provided in the air flow path, and 15 is a trigger valve for spraying the spray nozzle 7 which is also provided in the air flow path.

  The storage tank 3 has a hopper-shaped storage tank main body 16 disposed inside a sealed cylindrical container whose outer periphery is entirely covered with a heat insulating material and an electric heater 13, and sulfur and inorganic substances are injected from an inlet provided in the upper part thereof. In addition to injecting a mixture of system additives, the outer periphery of the storage tank body 16 is filled with flame retardant oil O, and the heating electric heater 17 disposed in the oil O is heated. Thus, the storage tank main body 16 is heated via the oil O, so that the sulfur in the storage tank main body 16 is always heated and kept in a molten state.

  The fixed discharge pump 5 is connected to the motor M and is of a screw type capable of discharging a predetermined amount of molten sulfur corresponding to the number of rotations of the motor M by rotational driving thereof. The fixed delivery pump 5 may be a piston reciprocating type instead of the screw type. In addition, the outer periphery of the metering discharge pump 5 is also covered with a heat insulating material and an electric heater 13.

  For example, two thermometers T2 and T3 are provided in the flow path of the heated compressed air from the upstream to the tip of the spray nozzle 7, and a pressure gauge P1 is also disposed. Further, a thermometer T <b> 1 is provided in the storage tank 3, and these measured values are input to the control unit 18 together with the measured values of the compressed air generating means 1. In addition, the thermometer T0 is provided also in the storage tank main body 16, and the thermometer T0 is what a manager measures visually by this embodiment.

  The control unit 18 performs drive control of the compressor 8, temperature control of the burner 12 and heaters 13 and 17, and drive control of the motor M in accordance with these measured values, and is a construction target at the optimum mixing ratio, flow velocity and optimum temperature. Management is performed so that molten sulfur particles are sprayed onto the surface of the concrete structure 19.

  That is, the temperature control of the burner 12 and the heaters 13 and 17 is performed so that the temperature of T1 to T3 falls within the range of 110 ° C., which is equal to or higher than the melting point, to 155 ° C. below the alteration temperature. Further, the drive control of the compressor 8 and the motor M is performed so that the preset spraying pressure and the atomization of the molten sulfur have an optimum relationship.

  As described above, sulfur fine particles are sprayed on the surface of the structure 19 in a molten state, and are cooled and solidified by contacting the surface of the structure, thereby forming a solidified film having a predetermined thickness.

  The sulfur used for this spraying may be pure sulfur, but a modified sulfur obtained by adding an olefin polymer to pure sulfur or a mixture of this and an inorganic additive is desirable. By using such a material, The solidified body film is excellent in water barrier properties, acid resistance, and alkali resistance, and has a sufficiently high adhesion to concrete, and can be sufficiently used as an anticorrosive film.

  In addition, the structure 19 to be constructed can be applied to existing or new concrete structures in general, but preferably in places where corrosion is particularly significant such as sewerage related facilities, marine structures, waste disposal sites, hot spring related facilities, etc. What is necessary is just to use for the surface protection of the constructed concrete structure.

  FIG. 2 shows a specific configuration example of the storage tank 3. In the figure, the storage tank 3 is fixed on a pedestal 20, and passes through the bottom of the hopper-shaped storage tank main body 16 fixed inside and the center of the pedestal 20 in the vertical direction, and is attached to the external metering pump 5. The lower end thereof is communicated with the mixing unit 4 through the joint 21.

  A support stand 22 is erected on one side of the pedestal 20, and the motor M is fixed on the support stand 22. The motor M has a reduction gear, and the rotation drive shaft 23 passes through the storage tank 3 and the upper part of the main body 16 and is connected to the pump 5.

  The pump 5 is a monolithic pump, and is generally used for transferring a relatively high-viscosity fluid, and has a structure suitable for discharging a predetermined amount of molten sulfur having a predetermined viscosity per predetermined time.

  Further, the inside of the storage tank 3 is filled with oil O on the outer periphery of the main body 16, and the oil O is heated so as to surround the lower outer periphery of the main body 16, so that sulfur in the main body 16 is indirectly increased. An electric heater 17 for heating is disposed.

  Further, the mixing section 4 is of an elbow type, and is used to move the molten sulfur supplied vertically inside as indicated by the arrow in the horizontal direction, and the overall pipe diameter is increased for stable supply. In addition, the connecting pipe 24 of the heated compressed air connected to the mixing unit 4 has a small diameter in order to increase the spraying force.

  FIG. 3 shows a modification of the external pump storage tank shown in FIG. 2, and the mixing section 4 ′ is a straight pipe type, which is transported in the vertical direction as shown by an arrow. Other than the connection, it is the same as that of FIG.

  FIG. 4 shows a pump internal storage tank. In the figure, an inner tube 26 is arranged at the center of the storage tank body 16, the metering discharge pump 5 is provided at the lower part thereof, and is connected to a rotary drive shaft 23 that penetrates the upper part of the storage tank 3 and the inner tube 26. . Further, a branch pipe 27 that passes through the outer peripheries of the storage tank body 16 and the storage tank 3 and is connected to the outside is connected to the upper outer periphery of the inner pipe 26, and a mixing unit 4 ″ is connected to the tip of the branch pipe 27. Yes.

  In this configuration, the molten sulfur in the main body 16 is taken in from the lower side of the pump 5, sent to the mixing unit 4 ″ through the inner pipe 26 and the branch pipe 27, and joined with the heated compressed air through the connecting pipe 28 connected obliquely thereto. It is what is jetted.

It is explanatory drawing of the spraying apparatus which concerns on this invention. It is sectional drawing which shows the specific structural example of the same pump external type storage tank. It is sectional drawing which shows the modification. It is sectional drawing which shows the specific structural example of the same pump internal-type storage tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressed air generating means 2 Heating means 3 Reserving means (storage tank)
4 Mixing section 5 Constant discharge means (pump)
7 Injection nozzle 9 Concrete structure

Claims (5)

By spraying molten sulfur particles on the surface of a concrete structure, a coating device for sulfur spraying material that forms a solidified coating of a predetermined thickness on the surface of the structure,
Compressed air generating means;
Heating means for heating the compressed air generated by the compressed air generating means to the melting point of sulfur or higher;
Storage means for storing molten sulfur alone or a mixture thereof while maintaining a molten state;
A fixed amount discharge means for sending the molten sulfur stored in the storage means or a mixture thereof into a mixing section provided in the flow path of the heated compressed air;
An apparatus for applying a sulfur spraying material, comprising: an injection nozzle provided at a tip of the mixing unit.   The storage means has a storage tank main body arranged inside a container, and the container is filled with oil on the outer periphery of the storage tank main body, and heating means is arranged in the oil. 2. The sulfur according to claim 1, wherein the storage tank main body is heated via the oil by the heating means, and the sulfur in the storage tank main body is stored while being held in a molten state. Spraying material coating equipment.   The sulfur spray material coating apparatus according to claim 1 or 2, wherein the storage means includes a hopper-shaped storage tank body.   The sulfur spray material coating apparatus according to any one of claims 1 to 3, wherein an outer periphery of the storage means is entirely covered with a heat insulating material and a heating means. 5. The screw-type or piston-reciprocating type, wherein the fixed-quantity discharge means is capable of discharging a predetermined amount of molten sulfur according to the rotation speed by rotating the motor. An apparatus for coating a sulfur spray material as described in 1.

Images