JP5387280B2 - Electrodeposition coating device - Google Patents

Description

  The present invention relates to an electrodeposition film forming apparatus for forming an electrodeposition film on a marine steel structure.

  Generally, some steel marine structures such as steel sheet piles provided on revetments, steel pipe piles provided on bridges and piers, etc., or steel caissons whose concrete structures are covered with steel members are submerged in seawater. It is provided in a state where it is exposed to an environment where rust is likely to occur.

  Accordingly, in such marine steel structures, rust is generated due to long-term use and the thickness is reduced and the strength is reduced. Therefore, it is necessary to perform reinforcement work or replacement work. Since a great deal of cost is required for the construction, an electrodeposition coating is formed to extend the life of the marine steel structure.

FIG. 9 is a schematic view showing an example of a method for forming an electrodeposition coating on a conventional marine steel structure 1, and the anode is formed with a predetermined interval with respect to the submerged portion 2 submerged in seawater of the marine steel structure 1. 3, a DC power source 4 is provided between the anode 3 and the marine steel structure 1 and a direct current is applied thereto, so that calcium ions (Ca ²⁺ ), magnesium ions (Mg ²⁺ ), etc. dissolved in seawater The cations migrate in the seawater toward the marine steel structure 1 as a cathode, and electrons are obtained in the marine steel structure 1. CaCO ₃ and Mg are formed on the surface of the submerged portion 2 of the marine steel structure 1. An electrodeposition coating 5 (electrocoating layer) mainly composed of (OH) ₂ or the like is formed, and the submerged portion 2 of the marine steel structure 1 is prevented from being corroded by the electrodeposition coating 5.

  For example, Patent Document 1 shows a general technical level related to a method of forming an electrodeposition coating on a marine steel structure as described above.

Japanese Patent No. 4146737

  However, when the anode 3 is disposed in seawater, it is necessary to dispose a large number of anodes 3 at regular intervals with respect to the submerged portion so as to make the current distribution uniform. There is a problem that labor is required and the cost increases. In addition, when the sea suddenly becomes rough due to a typhoon or the like, there is a problem that it is difficult to quickly pull up a large number of anodes 3 from the sea although it is necessary to quickly collect the anodes 3 from the sea water. there were. Furthermore, simply suspending the anode 3 in seawater causes the anode 3 to swing under the influence of waves and tidal currents, so that the current distribution to the submerged portion 2 of the marine steel structure 1 cannot be made uniform. there were.

  In view of such circumstances, the present invention is intended to provide an electrodeposition coating film forming apparatus that enables quick pulling of the anode and appropriately arranges the anode when forming the electrodeposition coating.

An electrodeposition coating film forming apparatus according to the present invention includes a gantry positioned above a marine steel structure, a wire arranged so as to be able to be drawn out or retracted by a winch installed on the gantry, and fixed to the wire so as to be perpendicular to the wire. A weight portion that applies tension in the direction, an electric wire that is fixed to the weight portion and is arranged to be energized with the marine steel structure, and is connected to the electric wire so as to be energized and immersed in seawater by feeding the wire. With an anode,
When the anode is immersed in seawater, an electrodeposition coating is formed on the submerged portion of the marine steel structure submerged in seawater.

  In the present invention, it is preferable that a plurality of anodes are arranged in a shape extending in the lateral direction, and the anodes are arranged in the vertical direction with an interval.

  Furthermore, in this invention, it is preferable to form the protrusion part which protrudes below in a weight part.

  Moreover, in this invention, it is preferable to support an electric wire on the reel installed in the mount frame.

  Further, in the present invention, it is preferable that the gantry is provided with traveling means so that the upper surface of the marine steel structure can travel.

  According to the electrodeposition coating film forming apparatus of the present invention, a large number of anodes are installed in seawater at a time by drawing out the wires by a winch, and a large number of anodes are removed from the seawater by pulling in the wires by the winch at a time. Therefore, the installation and removal of the anode can be simplified, the labor can be reduced, and the cost can be greatly suppressed. Even when the sea suddenly becomes rough due to a typhoon or the like, a large number of anodes can be quickly recovered from seawater by pulling in the wires. Furthermore, when forming an electrodeposition film, tension is applied to the wire in the vertical direction by the weight portion, so that the influence of waves and tidal currents is reduced, the anode is appropriately arranged, and the submerged portion of the marine steel structure is submerged. An excellent effect that the current distribution can be made uniform and good can be obtained.

It is a conceptual side view which shows the electrodeposition film forming apparatus of this invention. It is a conceptual front view which shows the electrodeposition film forming apparatus of this invention. It is an electrodeposition film forming apparatus of the present invention, and is an enlarged conceptual diagram showing a state of an anode and a wire before the anode is developed. It is an electrodeposition film forming apparatus of the present invention, and is an enlarged conceptual diagram showing a state of an anode and an electric wire before the anode is developed. It is a conceptual side view which shows the state which was the electrodeposition film forming apparatus of this invention, and the anode was expand | deployed. It is a conceptual front view which shows the state which was the electrodeposition film forming apparatus of this invention, and the anode was expand | deployed. It is a conceptual diagram which shows the state which reduces the influence of a wave or a tidal current with respect to the anode of the electrodeposition film forming apparatus of this invention. It is a conceptual side view which shows the other example of the electrodeposition film forming apparatus of this invention. It is a conceptual diagram which shows an example which forms the conventional electrodeposition film.

  Embodiments of the present invention will be described below with reference to FIGS.

  The electrodeposition coating film forming apparatus according to the embodiment includes a gantry 7 located above the marine steel structure 6, a wire 9 wound around a winch 8 installed on the gantry 7, and a weight portion fixed to the wire 9. 10, an electric wire 11 fixed to the weight portion 10, and an anode 12 connected to the electric wire 11.

  The gantry 7 has a lower member 14 disposed on the upper surface 6a of the marine steel structure 6 via a bottom member 13, and an upper member 16 disposed on the lower member 14 via an intermediate member 15 having a truss structure, along the coastline. A structure having a predetermined width is formed. Further, the lower member 14 of the gantry 7 extends from the upper surface 6a of the marine steel structure 6 to the sea side, and is provided with an overhanging portion 17 that protrudes toward the sea side at the tip of the lower member 14 on the sea side. Further, the upper member 16 of the gantry 7 extends from the upper side of the marine steel structure 6 to the sea side, and an arm that protrudes to the sea side from the overhanging portion 17 of the lower member 14 at the sea side tip of the upper member 16. A portion 18 is provided. Furthermore, the bottom member 13 and the lower member 14 are fixed to the upper surface 6a of the marine steel structure 6 by connecting means (not shown) such as a chemical anchor, and the lower member 14, the intermediate member 15, and the upper member 16 are Are assembled by connecting means (not shown) such as bolts. Here, instead of the bottom member 13, the gantry 7 may be provided with traveling means 19 such as wheels and rails and a driving unit 20 such as a motor as shown in FIG. When the counterweight 21 is provided, it is preferable to arrange the counterweight 21 on the gantry 7 so as to balance the entire weight.

  A winch 8 is arranged at one end of the upper member 16 of the gantry 7 so as to be located on the side opposite to the sea, and a guide sheave is located at the other end of the upper member 16 of the gantry 7 so as to be located on the sea side. The winch 8 and the guide sheave 22 are arranged one by one on both sides in the width direction of the gantry 7 (see FIG. 2). The winch 8 is provided with a rotating drum 23 that is rotated by a drive unit (not shown) such as a motor, and the wire 9 is wound around the rotating drum 23 and the guide sheave 22 of the winch 8 so that the wire 9 can be fed or retracted. It is hung.

  The wire 9 is a covered wire having durability against seawater, and a weight portion 10 such as a sinker is connected to the tips of the wires 9 on both sides so as to apply tension to the wire 9 in the vertical direction. Yes.

  The weight portion 10 is a heavy object having a predetermined length in the lateral direction, and includes a protrusion 24 (see FIGS. 5 and 6) such as a steel bar protruding downward on the bottom surface. Here, the shape and the number of the protrusions 24 are not particularly limited as long as they protrude downward from the bottom surface (two in FIG. 6).

  On the other hand, a reel body 25 such as an inverter reel is installed on the upper member 16 of the gantry 7 so as to be positioned between the winches 8 on both sides, and the central guide is positioned between the guide sheaves 22 on both sides. A sheave 26 is disposed, and the electric wire 11 is wound around the reel 27 and the central guide sheave 26 of the reel body 25. Here, the reel body 25 may be provided with a drive unit (not shown) such as a motor so that the electric wire 11 can be fed or drawn. 1 and 5, the tip end side of the electric wire 11 is omitted from the midway position.

  The electric wire 11 is connected to a power supply facility 28 placed on the lower member 14 of the gantry 7 via a power supply line 29 and connected to the marine steel structure 6 via a connection line 30. The marine steel structure 6 can be energized. 2 and 6, the electric wire 11 is branched into two from the front of the anode 12, and the electric wire 11 has a configuration in which the electric wire 11 is bundled into one from the anode 12 to the weight portion 10. A plurality of anodes 12 are fixed at regular intervals. Further, a weight portion 10 such as a sinker is connected to the tip of the electric wire 11, and when the wire 9 is drawn out, the electric wire 11 is pulled out as the weight portion 10 is lowered. Here, the power supply equipment 28 connected to the electric wire 11 is not arranged on the gantry 7 but may be another external power supply equipment.

  The anode 12 is a bar extending in the lateral direction and is arranged in a plurality of bowl shapes. On both sides of the anode 12, as shown in FIG. 3, there are provided guide holes 12 a through which the wires 9 are passed in an insulated state. At a position near the center, as shown in FIG. 4, a connecting portion 12b for connecting the electric wire 11 so as to be energized is provided. Here, the anode 12 is an insoluble electrode subjected to platinum plating or the like, but other materials may be used as long as the anode 12 can be energized with the submerged portion 6b of the marine steel structure 6. Further, the anode 12 may be disposed instead of the weight portion 10.

  The operation of the embodiment for carrying out the present invention will be described below.

  Before the electrodeposition coating is formed on the submerged portion 6b of the marine steel structure 6 submerged in the sea water, as a preparation stage, the entire apparatus is moved to a position above the submerged portion 6b where the electrodeposition coating is necessary, The weight portion 10 is placed on the protruding portion 17 of the lower member 14 and the wire 9 is pulled into the winch 8. Here, the electric wire 11 may be loosened between the anodes 12 and 12 or between the anode 12 at the lower end and the weight portion 10, or the plurality of anodes 12 may be positioned between the guide sheave 22 and the reel 27. As described above, the electric wire 11 may be drawn into the reel 27.

  When an electrodeposition coating is formed on the submerged portion 6b of the marine steel structure 6, as a charging stage, the winch 8 is driven to feed the wire 9 so as to pass through the guide hole 12a of the anode 12, and at the same time the weight The electric wire 11 is pulled out via the part 10, and the anode 12 is immersed in seawater.

  Then, as an installation stage, the weight part 10 is landed on the sea bottom B so that the protruding part 24 pierces the sea bottom B, the tension is applied to the wire 9 in the vertical direction by the weight part 10, and the anode is fixed by fixing the electric wire 11 and the anode 12. 12 are arranged in a bowl shape at regular intervals in the vertical direction in the sea. Here, the weight of the weight portion 10, the diameter of the wire 9, the structure of the gantry 7, the distance between the anode 12 and the submerged portion 6 b, the arrangement of the anode 12 in a bowl shape, the size of the anode 12, etc. It is preferable to determine based on various conditions such as the state of the sea, the structure of the marine steel structure 6, and the shape and area of the submerged portion 6b before being immersed in the water.

  After the anode 12 is installed, as the electrodeposition film forming stage, a direct current is passed from the power supply facility 28 to the electric wire 11 to energize the anode 12 and the marine steel structure 6, and the submerged portion 6 b of the marine steel structure 6 is energized. To form an electrodeposition coating. At this time, with respect to waves and currents acting from all directions as shown in FIG. 7 (arrows in FIG. 7), the anode is arranged in a bowl shape with a certain interval in the vertical direction. As a result, the anode 12 is always in a predetermined position in seawater, and an electrodeposition film is stably formed on the submerged portion 6b of the marine steel structure 6. Further, when the wave or the tidal current is strong, after the anode 12 and the wire 9 are tied in an insulated state, the anode 12 may be immersed in seawater to suppress the fluttering of the anode.

  When the formation of the electrodeposition film is completed, as a recovery stage, the winch 8 is driven in the reverse direction to pull the wire 9, the anode 12 and the weight portion 10 are pulled up from the seawater, and the weight portion 10 is moved to the lower member 14. Place on the overhang 17. At this time, the wire 9 is in a tensioned state as shown in FIG. 3, and the electric wire 11 is connected between the anodes 12 and 12, as shown in FIG. It is in a state that causes slack.

  Thereafter, the entire apparatus is removed and then moved to a place where an electrodeposition coating is required. Here, when the gantry 7 includes the traveling means 19, the traveling means 19 may move to a place where the electrodeposition coating is required next after the electrodeposition coating is formed.

  On the other hand, when the sea suddenly becomes rough due to a typhoon or the like, the anode 12 and the weight portion 10 are similarly lifted up and collected from the seawater, and then the anode 12 is placed in the seawater again after the weather has settled. Form a film. Here, when the gantry 7 is provided with the traveling means 19, the anode 12 and the weight portion 10 can be collected and then retracted to a safer place by the traveling means 19 or the like.

  Thus, according to the embodiment, as described above, a large number of anodes 12 are installed in seawater by pulling out the wires 9 by the winch 8, and a large number of anodes are drawn by drawing the wires 9 by the winch 8. 12 can be removed from the seawater at a time, so that the installation and removal of the anode 12 can be simplified, the labor can be reduced, and the cost can be greatly reduced. Even when the sea suddenly becomes rough due to a typhoon or the like, by pulling the wire 9, a large number of anodes 12 can be quickly recovered from the seawater and easily retracted. Furthermore, when the anode 12 is placed in seawater to form an electrodeposition coating, the weight portion 10 applies tension to the wire 9 in the vertical direction, so that the influence of waves and tidal currents is reduced and the anode 12 is appropriately The current distribution with respect to the submerged portion 6b of the marine steel structure 6 can be made uniform and good.

  In the embodiment, when a plurality of anodes 12 are arranged in a shape extending in the horizontal direction and the anodes 12 are arranged in the vertical direction with a gap therebetween, the length direction of the anode 12 matches the water flow, and the water flow resistance is reduced. Since it is made small, the influence of waves and tidal currents can be greatly reduced to maintain the position of the anode 12, and the current distribution to the submerged portion 6b of the marine steel structure 6 can be made uniform and extremely good.

  In the embodiment, when the protruding portion 24 that protrudes downward is formed on the weight portion 10, the protruding portion 24 pierces the seabed B when the weight portion 10 lands on the seabed B, so that the frictional resistance with the seabed B is increased. Thus, the movement in the front-rear and left-right directions is suppressed, and thus the influence of waves and tidal currents is reduced to favorably maintain the position of the anode 12, and the current distribution to the submerged portion 6b of the marine steel structure 6 is made uniform and extremely good. be able to.

  In the embodiment, when the electric wire 11 is supported on the reel 27 installed on the gantry 7, the electric wire 11 is easily drawn out and pulled in. Therefore, even if the sea is suddenly roughened by a typhoon or the like, the electric wire 11 Can be easily drawn together with the wire 9 so that a large number of anodes 12 can be quickly recovered from seawater and easily retracted.

  Further, in the embodiment, if the gantry 7 is provided with the traveling means 19 or the like and can travel on the upper surface 6a of the marine steel structure 6, it can easily move to the place where the electrodeposition coating is formed. The degree of freedom of formation can be increased, and even when the sea suddenly becomes rough due to a typhoon or the like, the wire 9 can be pulled in and moved by the traveling means 19 to be more easily saved.

  In addition, the electrodeposition coating film forming apparatus of the present invention is not limited to the illustrated examples described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

6 marine steel structure 6a upper surface 6b submerged part 7 mount 8 winch 9 wire 10 weight part 11 electric wire 12 anode 18 arm part 19 traveling means 24 protrusion part 27 reel

Claims (5)

A pedestal located above the marine steel structure, a wire disposed so as to be able to be drawn out or retracted by a winch installed on the pedestal, a weight part fixed to the wire and applying tension to the wire in a vertical direction, An electric wire fixed to the weight part and arranged to be energized with the marine steel structure; and an anode connected to the electric wire so as to be energized and immersed in seawater by feeding the wire;
An electrodeposition coating film forming apparatus configured to form an electrodeposition coating on a submerged portion of a marine steel structure submerged in seawater when the anode is immersed in seawater.   2. The electrodeposition coating film forming apparatus according to claim 1, wherein a plurality of anodes are arranged in a shape extending in the lateral direction, and the anodes are arranged in the vertical direction at intervals.   The electrodeposited film forming apparatus according to claim 1, wherein a protrusion protruding downward is formed on the weight.   2. The electrodeposition coating film forming apparatus according to claim 1, wherein the electric wire is supported by a reel installed on a gantry.   The electrodeposition forming apparatus according to claim 1, wherein the gantry is provided with traveling means so as to be able to travel on the upper surface of the offshore structure.

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