JP2017043833A - Energization device and energization method for steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energization device and an energization method for s steel structure suppressing the corrosion of a connection part upon energization and increasing the durability of the device.SOLUTION: Provided is an energization device for a steel structure where a steel structure 1 arranged at marine or brackish water is energized from an anode 7 in water, comprising: a power source 2 installed in the steel structure 1 or on the land; the anode 7 connected to the power source 2 via an electric wire 5 and also arranged in water; and an arrangement part 14 arranging the anode 7 so as to be confronted with the steel structure 1, and the arrangement part 14 includes: extension member extended from the upper part into the water; and the lower member arranged at the lower part of the extension member via a connection part 12 and also conductively connected to the steel structure 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel structure energization device and a method for energization applied to a steel structure disposed in the ocean or brackish water.

  In general, steel sheet piles provided on revetments, steel pipe piles provided on bridges and piers, etc., or steel structures such as steel caissons whose surface is covered with steel members, are partially submerged in the ocean or brackish water. And is exposed to an environment where rust is likely to occur. For this reason, when a steel structure is used for a long period of time, it is necessary to perform reinforcement work or replacement work so as to cope with the thinning due to the occurrence of rust.

In recent years, it has been considered that an electrodeposition film is formed on a steel structure as a technique for preventing the thinning of the steel structure. When an electrodeposition coating is formed on a steel structure, an anode is arranged at a predetermined interval with respect to the submerged part of the steel structure submerged in the ocean or brackish water, and a power source is provided between the anode and the steel structure. So that a direct current is applied. As a result, cations such as calcium ions (Ca ²⁺ ) and magnesium ions (Mg ²⁺ ) in water migrate in water toward the steel structure as a cathode to obtain electrons in the steel structure. An electrodeposition coating (electrocoating layer) such as CaCO ₃ and Mg (OH) ₂ is formed on the surface of the submerged portion of the object to prevent the steel structure from being thinned.

  In addition, in an apparatus for forming an electrodeposition coating on a steel structure, a string-like member such as a wire extending vertically from above to underwater, and a lower member such as a weight portion for applying a tension to the string-like member in the vertical direction And the anode is fixed so that the anode is stably placed in water. Furthermore, the string-like member and the lower member are connected via a connecting portion, and the connecting portion is a metal fitting having high strength so as to withstand the load of the lower member.

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

JP-A-10-313728

  However, the connecting portion of the metal fitting that connects the string-like member and the lower member has a problem that stray current is generated during energization, corrosion occurs in the connecting portion, and the durability of the apparatus is lowered.

  In view of such circumstances, the present invention is intended to provide a current-carrying device and a current-carrying method for a steel structure that suppress corrosion of a connection portion during current supply and increase the durability of the device.

The steel structure energization apparatus of the present invention is a steel structure energization apparatus for energizing from an anode in water to a steel structure arranged in the ocean or brackish water,
A power source installed on the steel structure or on land, an anode connected to the power source via an electric wire and disposed in water, and a disposing portion for disposing the anode facing the steel structure,
The arrangement portion includes an extending member extending from above to underwater, and a lower member arranged at a lower portion of the extending member via a connection portion and connected to a steel structure so as to be conductive. is there.

  Moreover, in the current-carrying device for a steel structure according to the present invention, the extending member of the arrangement portion is a string-like member extending in the vertical direction, and the lower member of the arrangement portion applies tension to the string-like member. Preferably, the anode is configured to be supported by at least one of a string-like member and a weight portion.

  In the steel structure energization apparatus according to the present invention, the extending member of the arrangement portion is a string-like member extending in the vertical direction, and the lower member of the arrangement portion is projected from the steel structure. It is preferable that it is a downward extension material which is formed in and supports the lower part of the string-like member, and the anode is supported by at least one of the string-like member and the downward extension material.

  In the steel structure energization apparatus according to the present invention, the extending member of the arrangement portion is a fixing member that extends in the vertical direction and fixes the anode, and the lower member of the arrangement portion is a steel structure. It is preferable that the lower projecting material is formed so as to project from the bottom and supports the lower part of the fixing member.

  In the current-carrying device for a steel structure according to the present invention, it is preferable that an insulating portion is interposed between the fixing member and the anode.

  Moreover, in the current-carrying apparatus for a steel structure according to the present invention, it is preferable that the connecting portion is a metal member.

  In the steel structure energization apparatus of the present invention, it is preferable that the connection between the lower member of the arrangement portion and the steel structure is at least one of fastening, latching, placing, and welding.

  In the steel structure energization apparatus of the present invention, it is preferable that the lower member of the arrangement portion and the steel structure are connected via a wiring.

The method for energizing a steel structure of the present invention is a method for energizing a steel structure that is energized from an anode in water with respect to a steel structure disposed in the ocean or brackish water,
An extending member extending from above to underwater so as to be disposed opposite to the steel structure, and the anode is disposed at a lower portion of the extending member via a connecting portion and connected to the steel structure so as to be conductive. A lower member to be provided,
When the anode is energized, the steel structure and the lower member are conducted to form an electrodeposited film or cathodic protection on the connecting portion.

  In the method for energizing a steel structure of the present invention, it is preferable that the lower member is connected to the steel structure by at least one of fastening, latching, placing, and welding.

  In the method for energizing a steel structure according to the present invention, it is preferable that the lower member is connected to the steel structure via a wiring.

  In the method for energizing a steel structure according to the present invention, it is preferable that the lower member is submerged in the ocean or brackish water after the lower member is connected to the steel structure via a wiring.

  According to the current-carrying device and current-carrying method for a steel structure of the present invention, it is possible to achieve excellent effects of suppressing corrosion of the connection portion during current-carrying and increasing the durability of the device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual side view which is the 1st example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the structure which can be supplied with electricity. BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual side view which shows the structure which can be rolled up, and is the 1st example of the electricity supply apparatus and electricity supply method of the steel structure of this invention. It is the arrow line view which looked at FIG. 2 from the III-III direction. It is a conceptual front view which is the 1st example of the electricity supply apparatus and the electricity supply method of the steel structure of this invention, and shows the other support structure of an anode. It is a conceptual front view which is the 1st example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows another support structure of an anode. It is a conceptual diagram which shows the structure of the connection part which connects a string-shaped member and a weight part. It is a flow which shows the process sequence for it being a 1st example of the electricity supply apparatus and the electricity supply method of the steel structure of this invention, and supplying with electricity. BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual side view which is a 1st example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the connection structure of a lower member and a steel structure. It is a conceptual side view which is the 1st example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the other connection structure of a lower member and a steel structure. It is the arrow line view which looked at FIG. 9 from XX direction. It is a conceptual side view which is the 2nd example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the structure which can be supplied with electricity. It is a flow which is the 2nd example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the process sequence for supplying with electricity. It is a conceptual side view which is the 3rd example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the structure which can be supplied with electricity. (A) is an example which shows the structure which fixes an anode to a fixing member in an insulated state, (b) is another example which shows the structure which fixes an anode to a fixing member in an insulated state. It is a flow which is the 3rd example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the process sequence for supplying with electricity. It is a conceptual side view which shows the structure which can be electrically supplied as a 4th example of the electricity supply apparatus and electricity supply method of the steel structure of this invention. It is a conceptual side view which is a 4th example of the electricity supply apparatus and electricity supply method of the steel structure of this invention, and shows the connection structure of a lower member and a steel structure. It is a flow which is the 4th example of the energization apparatus and energization method of the steel structure of this invention, and shows the process sequence for energizing.

  Hereinafter, a first example of an embodiment for carrying out the present invention will be described with reference to FIGS.

  The energizing apparatus and energizing method for a steel structure shown in the first example of the embodiment are applied as a temporary apparatus and method to the steel structure 1 arranged in the ocean or brackish water (brake water area). The steel structure 1 is a steel sheet pile provided on a seawall, a steel pipe pile provided on a bridge or a pier, a steel caisson having a surface of a concrete structure covered with a steel member, and a part thereof is submerged in the ocean or brackish water. If so, there is no particular limitation.

  In the first example of the steel structure energizing apparatus, a power source 2 is installed on the upper surface of the steel structure 1 or on land as shown in FIG. 1, and a frame projecting above the water surface on the upper end side of the steel structure 1. In this way, a projecting stand 3 is provided. The power source 2 includes a main-side electric wire 5 that extends into the water via a guide sheave 4 on the overhang base 3 and a ground-side electric wire that extends downward via a guide material (not shown). An electric wire 6 is provided. The main-side electric wire 5 is connected to a plurality of anodes 7 arranged in water, and the ground-side electric wire 6 is connected to a grounding member 8 attached to the steel structure 1. Here, the anode 7 may be plural (four in FIG. 1) or one, and the number and shape are not particularly limited.

  A winch 9 is provided in the vicinity of the overhanging base 3 on the steel structure 1 as shown in FIG. 2, and a string-like member (extending member) 11 such as a rope or a wire is wound around the winch 9. ing. The string-like member 11 extends from the upper side to the water via the guide sheave 10 on the overhanging stand 3 by being fed out from the winch 9. In addition, a weight portion (downward member) 13 is connected to the lower end of the string-like member 11 via a connection portion 12. Furthermore, the string-like member 11 and the weight part 13 are configured as an arrangement part 14 for stably arranging the anode 7, and the anode 7 is arranged opposite to the submerged part 1 a of the steel structure 1 and at a predetermined interval. It has become so.

  A plurality of string-like members 11 such as ropes and wires are arranged (two in FIG. 3) so as to be located on both sides of the electric wire 5 and the anode 7. Support. Here, the string-like member 11 may support both sides of the anode 7 formed in the lateral direction as shown in FIG. 3, or another string-like member 11a such as a rope or a wire is used separately as shown in FIG. Thus, both sides of the anode 7 formed in the vertical direction may be supported. Further, the support structure of the string-like member 11 and the anode 7 is not particularly limited, such as fastening, welding, locking, and fixing. Further, the string-like member 11 may be plural or one as long as it can stably support the anode 7.

  The weight portion 13 is a heavy object having a predetermined length and is arranged at the bottom of the ocean or brackish water, and applies tension to the string-like member 11 in the vertical direction. Further, the weight portion 13 can be connected to the steel structure 1 using a protrusion formed on the weight portion 13 or the steel structure 1, a conductive rod member, or a string-like member. Further, instead of supporting the anode 7 with the string-like member 11, the electric wire 5 of the anode 7 or the like may be connected to the weight portion 13 as shown in FIG. 5 and the anode 7 may be supported by the weight portion 13. .

  As shown in FIG. 6, the connecting portion 12 includes a mounting bracket 17 on a pulley 15 disposed below the string-like member 11 via a plurality of wires or slings 16. The string-like member 11 and the weight portion 13 are connected by fastening to the suspension piece 18 formed on the belt 13. Further, the pulley 15, the wire or sling 16, the mounting bracket 17, and the suspension piece 18 are metal members, and the metal surface of each member is coated with an insulating paint or wound with an insulating tape so as to be insulated as much as possible. ing. Here, the connecting portion 12 is not limited to the pulley 15 or the like as long as the string-like member 11 and the weight portion 13 are connected by a metal member, and may be other parts.

  Next, an example of a specific connection structure between the weight portion (lower member) 13 of the arrangement portion 14 and the steel structure 1 will be described. As shown in FIG. 8, one end of the weight portion 13 is provided with a protrusion 13a toward the steel structure 1, and a plurality of bolt holes (not shown) are formed in the protrusion 13a. In addition, a piece portion 1b protruding into the ocean or brackish water is disposed on the lower side surface of the steel structure 1 by welding, and a plurality of fastening holes (not shown) are formed in the piece portion 1b. . Further, the protruding portion 13a of the weight portion 13 and the piece portion 1b of the steel structure 1 can be connected to each other by being fastened through the bolt B and the bolt hole and the fastening hole. Here, if the fastening of the protrusion 13a of the weight 13 and the piece 1b of the steel structure 1 can be conducted, the shape, material, fastening position, and number of fastening are not particularly limited, and welding It may be fixed by.

  Subsequently, another example of the specific connection structure between the weight portion (lower member) 13 of the arrangement portion 14 and the steel structure 1 will be described. As shown in FIGS. 9 and 10, at one end of the weight portion 13, a protruding portion 13d including an extending portion 13b toward the steel structure 1 side and a lower portion 13c extending downward from the tip of the extending portion 13b is provided. It is arranged. Also, on the lower side surface of the steel structure 1, a piece portion 1e comprising a plurality of arm portions 1c protruding in the ocean or brackish water and a connecting portion 1d for connecting the tips of the plurality of arm portions 1c is arranged by welding. A predetermined size is formed in a space 1f surrounded by the arm portion 1c and the connecting portion 1d. Further, the protrusion 13d of the weight part 13 and the piece part 1e of the steel structure 1 can be made conductive by inserting the lower part 13c of the protrusion part 13d into the space 1f of the piece part 1e to be hooked or placed. ing. Here, the shape, material, connection position, and number of connections are particularly limited if the connection between the projection 13d of the weight 13 and the piece 1e of the steel structure 1 by hooking or placing can be conducted. It is not a thing and may be fixed by welding.

  The operation of the first embodiment of the present invention will be described below.

  When energizing the submerged portion 1a of the steel structure 1 submerged in the ocean or brackish water (brackish water area), as a preparatory stage, the winch 9 is driven and the electric wire 5 is fed while feeding the string-like member 11 such as a wire. It sends out, the weight part 13 is lowered | hung, the anode 7 is sunk in the ocean or brackish water, and the weight part 13 is installed in the bottom part of the ocean or brackish water (step S1 of FIG. 7). Thereby, the string-like member 11 and the weight part 13 arrange | position the anode 7 in a predetermined position. Here, the interval between the anode 7 and the submerged portion 1a, the arrangement of the anode 7, the size of the anode 7, etc. are set before the anode 7 is submerged in the ocean or brackish water. It is preferable to determine based on various conditions of the shape and area of the submerged portion 1a. Further, it is preferable that excessive tension is not generated in the electric wire 5.

  Next, the weight part 13 and the steel structure 1 are connected using the protrusions of the weight part 13 or the steel structure 1, a rod member, and a string-like member to be in a conductive state (step S <b> 2 in FIG. 7). Here, as shown in FIG. 8, in the case of an example of the connection structure, the position of the projection 13 a of the weight portion 13 and the piece portion 1 b of the steel structure 1 are adjusted, and the bolt hole of the projection portion 13 a and the piece portion 1 b Bolts B are fastened to the fastening holes through the bolts B so that they can be conducted. As shown in FIGS. 9 and 10, in the case of another example of the connection structure, the position is adjusted as the weight portion 13 is lowered, and the lower portion 13c of the protruding portion 13d is inserted into the space 1f of the piece portion 1e. And put it in a conductive state. Furthermore, if the connection between the weight part 13 and the steel structure 1 is made conductive, the procedure and configuration are not particularly limited.

  Subsequently, after connecting the weight portion 13 and the steel structure 1, a direct current is passed from the power source 2 to the electric wire 5 to energize the anode 7 and the steel structure 1 (step S3 in FIG. 7). An electrodeposition film is formed or cathodic protection is performed on the submerged portion 1a.

  At the same time, when the anode 7 and the steel structure 1 are energized, conduction is established between the weight portion 13 and the steel structure 1 (step S4 in FIG. 7), and the weight portion 13 is electrically negative like the steel structure 1. In this state, an electrodeposited coating is formed on the metal surface where the coating of the connection portion 12 is not sufficiently covered or the metal surface where the coating of the connection portion 12 is peeled off or the anticorrosion is performed to prevent the occurrence of stray current.

  When energization is completed, as a recovery stage, the winch 9 is driven in the reverse direction to draw the string-like member 11 and the electric wire 5, and the anode 7 and the weight portion 13 are pulled up from the water (step S5 in FIG. 7). 7 and the weight 13 are placed on the steel structure 1 and the process is terminated. Here, after the energization is completed, the entire device may be removed and moved to a place where energization is required next, or when it is necessary to form an electrodeposition coating or cathodic protection, re-install and energize. Also good.

  Thus, according to the first example of the embodiment, when the anode 7 and the steel structure 1 are energized, the weight portion 13 and the steel structure 1 are electrically connected, and electrodeposition is performed on the metal surface of the connection portion 12. Since the formation of the coating or the anticorrosion is performed, the corrosion of the connecting portion 12 can be suppressed and the durability of the device can be enhanced. Further, since the durability of the connecting portion 12 is enhanced, the weight portion 13 can be appropriately lifted after the energization is completed.

  In the first example of the embodiment, the extending member of the arrangement portion 14 is the string-like member 11 extending in the vertical direction, and the lower member of the arrangement portion 14 is a weight that applies tension to the string-like member 11. It is a part 13, and the anode 7 is configured to be supported by at least one of the string-like member 11 and the weight part 13. Thereby, corrosion of the connection part 12 can be suppressed and the durability of the apparatus can be enhanced, and at the same time, the anode 7 can be stably disposed and can be suitably energized. Moreover, by placing the anode 7 stably, the load applied to the connection portion 12 between the weight portion 13 and the string-like member 11 can be reduced and the durability can be enhanced.

  In the first example of the embodiment, when the connecting portion 12 that connects the weight portion (lower member) 13 and the string-like member (extending member) 11 is a metal member, the connecting portion 12 is the load of the weight portion 13. In addition, it is possible to have durability that can withstand the above-mentioned conditions, and it is possible to maintain high durability over a long period of time as corrosion of the connection portion 12 is suppressed. Here, comparing the case where the connecting portion 12 is a metal member and the case where it is a resin member, the case of the metal member is superior to the case of the resin member in terms of durability and the like.

  In the first example of the embodiment, when the weight portion (lower member) 13 of the arrangement portion 14 is connected to the steel structure 1 by at least one of fastening, hooking, placing, and welding, the protrusion of the weight portion 13 Since the ground contact areas of the portions 13a and 13d and the piece portions 1b and 1e of the steel structure 1 can be increased, a large amount of electricity can be flowed, and the degree of freedom in energization can be increased and the durability can be increased. Further, when the weight portion (lower member) 13 of the arrangement portion 14 is connected to the steel structure 1 by at least one of fastening, hooking, and placing, the protruding portion 13a of the weight portion 13 and the piece of the steel structure 1 are connected. Since the part 1b can be easily attached and detached, the installation before energization and the lifting of the weight part 13 after energization can be facilitated.

  Hereinafter, a second example of the embodiment of the present invention will be described with reference to FIGS.

  The energization apparatus and energization method for a steel structure shown in the second example of the embodiment are applied as a semi-permanent apparatus and method to the steel structure 1 arranged in the ocean or brackish water (brake water area). . As in the first example, the steel structure 1 is a steel sheet pile provided on a revetment, a steel pipe pile provided on a bridge or a pier, a steel caisson having a surface of a concrete structure covered with a steel member, etc. If it is submerged in the ocean or brackish water, there is no particular limitation.

  As shown in FIG. 11, the power supply device 2 is installed on the upper surface of the steel structure 1 or on land as shown in FIG. 11, and the steel structure 1 has a frame projecting above the water surface. An upward projecting material (upper member) 19 is provided. Further, a frame-like downward projecting material (downward member) 20 projecting into water is attached to the side surface of the steel structure 1 so as to be conductive. The power source 2 includes a main-side electric wire 5 that extends into the water via a guide material (not shown), and an earth-side electric wire 6 that extends downward via the guide material (not shown). It has. The main-side electric wire 5 is connected to an anode 7 disposed in water, and the ground-side electric wire 6 is connected to a grounding member 8 attached to the steel structure 1. Here, the anode 7 may be one as shown in FIG. 11 or plural. The shape of the anode 7 is not particularly limited.

  A string-like member (extending member) 21 such as a rope or a wire extending in the vertical direction is disposed on the upper projecting material 19 and the lower projecting material 20. The upper projecting material 19, the lower projecting material 20, and the string-like member 21 are configured as an arrangement portion 22 for stably arranging the anode 7, and the anode 7 faces the submerged portion 1 a of the steel structure 1. And it arrange | positions with a required space | interval. Furthermore, the string-like member 21 and the downward projecting member 20 are connected via the connection portion 12. In addition, the electricity supply apparatus and the electricity supply method of the steel structure of the second example are semi-permanent structures, and the guide sheaves 4 and 10 (see FIGS. 1 and 2) may be omitted.

  The anode 7 is supported so as to be guided by a string-like member 21 such as a rope or a wire. Here, the configuration of the string-like member 21 may be any as long as it stably supports the anode 7, but is preferably arranged as in the first example. Further, the support structure for the string-like member 21 and the anode 7 is not particularly limited, such as fastening, welding, locking, and fixing. Furthermore, the string-like member 21 may be plural or one.

  As long as the connecting portion 12 is a metal member, a metal member such as a pulley 15, a wire or sling 16, a mounting bracket 17, a suspension piece 18 or the like may be used as in the first example (FIG. 6). The surface of the metal member is coated with an insulating paint or wrapped with an insulating tape to insulate as much as possible.

  The operation of the second embodiment of the present invention will be described below.

  When energizing the submerged portion 1a of the steel structure 1 submerged in the ocean or brackish water (brackish water area), as a preparatory stage, the upper overhanging material 19 is arranged on the upper surface end side of the steel structure 1, The downward projecting material 20 is attached to the side surface of the steel structure 1 so as to be conductive (step S11 in FIG. 12). Next, a rope and a wire-like member 21 for guiding the anode 7 are arranged on the downwardly projecting member 20 by the connecting portion 12 (step S12 in FIG. 12), and the string-like member 21 is pulled upward to the top end (upper end). The tension is applied to the entire length of the string-like member 21 (step S13 in FIG. 12). Then, the upper end of the string-like member 21 is connected to the upwardly projecting material 19, the string-like member 21 is stretched up and down, and the anode 7 is arranged at a predetermined position (step S14 in FIG. 12).

  Subsequently, a direct current is passed from the power source 2 to the electric wire 5 to energize the anode 7 and the steel structure 1 (step S15 in FIG. 12), and an electrodeposition film is formed on the submerged portion 1a of the steel structure 1 or electric Prevent corrosion. At the same time, when the anode 7 and the steel structure 1 are energized, the lower projecting member 20 and the steel structure 1 are electrically connected, and the lower projecting member 20 is electrically negative like the steel structure 1, Electrodeposition coating or cathodic protection is performed on the metal surface from which the coating of the connecting portion 12 has been peeled off or the metal surface where the coating of the connecting portion 12 is not sufficient, thereby preventing the occurrence of stray current.

  Thus, according to the second example of the embodiment, as in the first example, when the anode 7 and the steel structure 1 are energized, the downward projecting material 20 and the steel structure 1 are electrically connected. Since the electrodeposition coating is formed on the metal surface of the connection portion 12 or the anticorrosion is performed, the corrosion of the connection portion 12 can be suppressed and the durability of the device can be enhanced. The device of the second example does not need to be removed and can be used semipermanently.

  In the second example of the embodiment, the extending member of the arrangement portion 22 is a string-like member 21 extending in the vertical direction, and the lower member of the arrangement portion 22 is formed so as to protrude from the steel structure 1. The anode 7 is configured to be supported by at least one of the string-like member 21 and the downwardly-extending material 20. Thereby, corrosion of the connection part 12 can be suppressed and the durability of the apparatus can be enhanced, and at the same time, the anode 7 can be stably disposed and can be suitably energized. Moreover, by placing the anode 7 stably, it is possible to reduce the load applied to the connecting portion 12 between the downward projecting member 20 and the string-like member 21 and to enhance the durability.

  Hereinafter, a third example of the embodiment of the present invention will be described with reference to FIGS.

  The steel structure energizing apparatus and energizing method shown in the third example of the embodiment are semi-permanent apparatus and method for the steel structure 1 arranged in the ocean or brackish water (brackish water area), as in the second example. As applied. As in the first and second examples, the steel structure 1 is a steel sheet pile provided on a seawall, a steel pipe pile provided on a bridge or a pier, a steel caisson coated with a steel member on the surface of a concrete structure, or the like. There is no particular limitation as long as a part is submerged in the ocean or brackish water.

  As shown in FIG. 13, a power supply 2 is installed on the upper surface of the steel structure 1 or on land as shown in FIG. 13, and the upper part of the upper surface of the steel structure 1 has a frame-shaped upper extension device extending above the water surface. An output material (upper member) 19 is provided. Further, a frame-like downward projecting material (downward member) 20 is attached to the side surface of the steel structure 1 so as to project into water. The power source 2 includes a main-side electric wire 5 that extends into the water via a guide material (not shown), and an earth-side electric wire 6 that extends downward via the guide material (not shown). It has. The main-side electric wire 5 is connected to an anode 7 disposed in water, and the ground-side electric wire 6 is connected to a grounding member 8 attached to the steel structure 1. Here, the anode 7 may be one as shown in FIG. 13 or plural. The shape of the anode 7 is not particularly limited.

  The upper projecting material 19 and the lower projecting material 20 are provided with a fixing member (extending member) 24 that extends in the vertical direction and supports the anode 7. Further, the upper projecting material 19, the lower projecting material 20, and the fixing member 24 are configured as an arrangement portion 25 for stably arranging the anode 7, and the anode 7 is opposed to the submerged portion 1a of the steel structure 1 and It is arranged with a required interval. In addition, the energization apparatus and energization method of the steel structure of the third example are semi-permanent structures as in the second example, and the guide sheaves 4 and 10 (see FIG. 1) may be omitted.

  As shown in FIG. 14A, the anode 7 is fixed to a midway position of a rod or plate-like fixing member 24. The anode 7 is fixed to the fixing member 24 via a plate-like insulating portion 26 such as a rubber plate or a vinyl chloride plate, and is insulated from the fixing member 24. Here, the fixing member 24 may support the upper end and the lower end of the anode 7 through another insulating portion 27 as shown in FIG. The fixing member 24 is not particularly limited in arrangement and fixing as long as it supports the anode 7 in an insulated state.

  As long as the connecting portion 12 is a metal member, a metal member such as a pulley 15, a wire or sling 16, a mounting bracket 17, a suspension piece 18 or the like may be used as in the first example (FIG. 6). The surface of the metal member is coated with an insulating paint or wrapped with an insulating tape to insulate as much as possible.

  The operation of the third embodiment of the present invention will be described below.

  When energizing the submerged portion 1a of the steel structure 1 submerged in the ocean or brackish water (brackish water area), as a preparatory stage, the upper overhanging material 19 is arranged on the upper surface end side of the steel structure 1, A downwardly projecting material 20 is installed on the side surface of the steel structure 1 so as to be conductive. Next, the fixing member 24 to which the anode 7 is connected is attached to the lower overhanging material 20 and the upper overhanging material 19 through the connection portion 12, and the fixing member 24 and the anode 7 are installed (step S21 in FIG. 15). . Thereafter, the insulation state between the anode 7 and the fixing member 24 is confirmed (step S22 in FIG. 15). Here, the installation of the fixing member 24 and the anode 7 may be performed by other procedures, and is not particularly limited as long as the anode 7 is stably disposed.

  Subsequently, a direct current is supplied from the power source 2 to the electric wire 5 to energize the anode 7 and the steel structure 1 (step S23 in FIG. 15), and an electrodeposition film is formed on the submerged portion 1a of the steel structure 1 or electric Do anticorrosion. At the same time, when the anode 7 and the steel structure 1 are energized, the lower projecting member 20 and the steel structure 1 are electrically connected, and the lower projecting member 20 is electrically negative like the steel structure 1, Electrodeposition coating or cathodic protection is performed on the metal surface from which the coating of the connecting portion 12 has been peeled off or the metal surface where the coating of the connecting portion 12 is not sufficient, thereby preventing the occurrence of stray current.

  Thus, according to the third example of the embodiment, as in the second example, when the anode 7 and the steel structure 1 are energized, the downward projecting member 20 and the steel structure 1 are electrically connected. Since the electrodeposition coating is formed on the metal surface of the connection portion 12 or the anticorrosion is performed, the corrosion of the connection portion 12 can be suppressed and the durability of the device can be enhanced. Moreover, the apparatus of a 3rd example does not need to be removed like the 2nd example, but can be used semipermanently.

  In the third example of the embodiment, the extending member of the arrangement portion 25 is a fixing member 24 that extends in the vertical direction and fixes the anode 7, and the lower member of the arrangement portion 25 is from the steel structure 1. A downward projecting material 20 is formed so as to project and supports the lower part of the fixing member 24. Thereby, corrosion of the connection part 12 can be suppressed and the durability of the apparatus can be enhanced, and at the same time, the anode 7 can be stably disposed and can be suitably energized. Further, by stably disposing the anode 7, it is possible to reduce the load applied to the connecting portion 12 between the downward projecting member 20 and the fixing member 24, and to improve the durability.

  In the third example of the embodiment, when the insulating portions 26 and 27 are interposed between the fixing member 24 and the anode 7, the corrosion of the connecting portion 12 is suppressed to further increase the durability, and at the same time, the insulating portion 26. , 27 can prevent electric leakage and can be suitably energized.

  Hereinafter, a fourth example of the embodiment of the present invention will be described with reference to FIGS.

  The energizing apparatus and energizing method for a steel structure shown in the fourth example of the embodiment are applied as a temporary apparatus and method to the steel structure 1 arranged in the ocean or brackish water (brake water area). As in the first example, the steel structure 1 is a steel sheet pile provided on a revetment, a steel pipe pile provided on a bridge or a pier, a steel caisson having a surface of a concrete structure covered with a steel member, etc. If it is submerged in the ocean or brackish water, there is no particular limitation.

  As shown in FIG. 16, a power supply 2 is installed on the upper surface of the steel structure 1 or on the land as shown in FIG. 16, and the steel structure 1 has a frame projecting above the water surface. In this way, a projecting stand 3 is provided. The power source 2 includes a main-side electric wire 5 that extends into the water via a guide sheave 4 on the overhang base 3 and a ground-side electric wire that extends downward via a guide material (not shown). An electric wire 6 is provided. The main-side electric wire 5 is connected to a plurality of anodes 7 arranged in water, and the ground-side electric wire 6 is connected to a grounding member 8 attached to the steel structure 1. Here, the anode 7 may be plural (four in FIG. 16) or one, and the number and shape are not particularly limited.

  On the steel structure 1, similarly to the first example, a winch 9, a guide sheave 10, and a string-like member (extending member) 11 such as a rope or a wire are provided (see FIG. 2). In addition, a weight portion (downward member) 13 is connected to the lower end of the string-like member 11 via a connection portion 12. Furthermore, the string-like member 11 and the weight part 13 are configured as an arrangement part 14 for stably arranging the anode 7, and the anode 7 is arranged opposite to the submerged part 1 a of the steel structure 1 and at a predetermined interval. It has become so. Here, the string-like member 11 may support both sides of the anode 7 formed in the horizontal direction (see FIG. 3), or by using another string-like member 11a such as a rope or a wire in the vertical direction. You may support the both sides of the anode 7 formed (refer FIG. 4). Further, the support structure of the string-like member 11 and the anode 7 is not particularly limited, such as fastening, welding, locking, and fixing. Further, the string-like member 11 may be plural or one as long as it can stably support the anode 7.

  The weight portion 13 is a heavy object having a predetermined length and is arranged at the bottom of the ocean or brackish water, and applies tension to the string-like member 11 in the vertical direction. Moreover, as shown in FIG. 17, the one end of the weight part 13 is provided with the overhang | projection part 13e which goes to the steel structure 1 side. Furthermore, the overhanging portion 13 e of the weight portion 13 and the grounding member 8 of the steel structure 1 are connected via the wiring L. Furthermore, the wiring L is fixed to the overhanging portion 13e and the grounding member 8 by bolts and terminals, respectively. Here, if the connection between the overhanging portion 13e of the weight portion 13 and the grounding member 8 of the steel structure 1 is made conductive by the wiring L, the shape, material, fastening position, and number of fastening are particularly limited. It is not a thing. Further, the wiring L may be a portion other than the overhanging portion 13 e and the grounding member 8 as long as it is connected to the weight portion 13 and the steel structure 1. Further, instead of supporting the anode 7 with the string-like member 11, the electric wire 5 of the anode 7 or the like may be connected to the weight portion 13 and the anode 7 may be supported by the weight portion 13.

  As shown in FIG. 17, the connecting portion 12 includes a mounting bracket 17 on a pulley 15 disposed at the lower portion of the string-like member 11 via a plurality of wires or slings 16. The string-like member 11 and the weight portion 13 are connected by fastening to the suspension piece 18 formed on the belt 13. Further, the pulley 15, the wire or sling 16, the mounting bracket 17, and the suspension piece 18 are metal members, and the metal surface of each member is coated with an insulating paint or wound with an insulating tape so as to be insulated as much as possible. ing. Here, the connecting portion 12 is not limited to the pulley 15 or the like as long as the string-like member 11 and the weight portion 13 are connected by a metal member, and may be other parts.

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

  When energizing the submerged portion 1a of the steel structure 1 submerged in the ocean or brackish water (brass water area), as a preparatory stage, the submerged portion of the weight unit 13 is placed before the weight unit 13 is submerged in the ocean or brackish water 13e and the earthing member 8 of the steel structure 1 are connected by the wiring L to be in a conductive state (step S31 in FIG. 18).

  Next, the winch 9 is driven to feed the wire 5 while feeding the string-like member 11 such as a wire, the weight 13 is lowered, the anode 7 is submerged in the ocean or brackish water, and the weight 13 is installed at the bottom of the ocean or brackish water. (Step S32 in FIG. 18). Thereby, the string-like member 11 and the weight part 13 arrange | position the anode 7 in a predetermined position. Here, the interval between the anode 7 and the submerged portion 1a, the arrangement of the anode 7, the size of the anode 7, etc. are set before the anode 7 is submerged in the ocean or brackish water. It is preferable to determine based on various conditions of the shape and area of the submerged portion 1a. Further, it is preferable that excessive tension is not generated in the electric wire 5.

  Subsequently, after connecting the weight portion 13 and the steel structure 1, a direct current is passed from the power source 2 to the electric wire 5 to energize the anode 7 and the steel structure 1 (step S33 in FIG. 18). An electrodeposition film is formed or cathodic protection is performed on the submerged portion 1a.

  At the same time, when the anode 7 and the steel structure 1 are energized, conduction is established between the weight portion 13 and the steel structure 1 (step S34 in FIG. 18), and the weight portion 13 is electrically negative like the steel structure 1. In this state, an electrodeposited coating is formed on the metal surface where the coating of the connection portion 12 is not sufficiently covered or the metal surface where the coating of the connection portion 12 is peeled off or the anticorrosion is performed to prevent the occurrence of stray current.

  When the energization is completed, as a recovery stage, the winch 9 is driven in the reverse direction to draw the string-like member 11 and the electric wire 5, and the anode 7 and the weight portion 13 are pulled up from the water (step S35 in FIG. 18). 7 and the weight 13 are placed on the steel structure 1 and the process is terminated. Here, after the energization is completed, the entire device may be removed and moved to a place where energization is required next, or when it is necessary to form an electrodeposition coating or cathodic protection, re-install and energize. Also good.

  Thus, according to the fourth example of the embodiment, as in the first example, when the anode 7 and the steel structure 1 are energized, the weight part (lower member) 13 and the steel structure 1 are electrically connected. In addition, since the electrodeposition film is formed on the metal surface of the connection portion 12 or cathodic protection is performed, the corrosion of the connection portion 12 can be suppressed and the durability of the device can be improved. Moreover, since durability of the connection part 12 is improved, the weight part 13 can be appropriately pulled up after the end of energization. Furthermore, the same effect as the first example can be obtained.

  In the fourth example of the embodiment, the connection between the weight part (lower member) 13 of the arrangement part 14 and the steel structure 1 is via the wiring L, and the position where the weight part 13 is separated from the steel structure 1. Therefore, even if there is an uneven or protruding structure on the wall surface of the steel structure 1, it does not become an obstacle when sinking or lifting the weight part 13, The weight part 13 can be easily pulled up after the energization is completed.

  In the fourth example of the embodiment, after connecting the weight portion (lower member) 13 of the arrangement portion 14 to the steel structure 1 via the wiring L, the weight portion 13 is submerged in the ocean or brackish water. Since the work of connecting the weight part 13 and the steel structure 1 in a conductive manner is unnecessary, the work performed by divers or the like in the ocean or brackish water is greatly reduced, and the electrodeposition coating is applied to the metal surface of the connection part 12. Formation or cathodic protection can be easily performed.

  In addition, the energization apparatus and energization method of the steel structure of the present invention are not limited to the illustrated examples described above, and it is needless to say that various changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Steel structure 2 Power supply 5 Electric wire 7 Anode 11 String-like member (extending member)
12 connection part 13 weight part (lower part)
14 Arrangement part 20 Downward projecting material (lower member)
21 String member (extending member)
22 arrangement part 24 fixing member (extension member)
25 Arrangement part 26 Insulation part 27 Insulation part L Wiring

Claims (12)

A steel structure energization device for energizing from the anode in water to a steel structure located in the ocean or brackish water,
A power source installed on the steel structure or on land, an anode connected to the power source via an electric wire and disposed in water, and a disposing portion for disposing the anode facing the steel structure,
The arrangement portion includes a steel structure including an extending member extending from above to underwater, and a lower member arranged at a lower portion of the extending member via a connecting portion and connected to a steel structure in a conductive manner. Electrical device for things.   The extending member of the arrangement part is a string-like member extending in the vertical direction, the lower member of the arrangement part is a weight part for applying tension to the string-like member, and the anode is a string-like member The steel structure energization device according to claim 1, wherein the energization device is supported by at least one of the weight portion and the weight portion.   The extending member of the arrangement part is a string-like member extending in the vertical direction, and the lower member of the arrangement part is formed so as to protrude from the steel structure and supports the lower part of the string-like member The energization device for a steel structure according to claim 1, wherein the steel structure is a projecting material, and the anode is supported by at least one of a string-like member and a lower projecting material.   The extending member of the placement portion is a fixing member that extends in the vertical direction and fixes the anode, and the lower member of the placement portion is formed so as to protrude from the steel structure and extends below the fixing member. The energizing device for a steel structure according to claim 1, wherein the energizing device is a downward projecting material to be supported.   The steel structure energization device according to claim 4, wherein an insulating portion is interposed between the fixing member and the anode.   The said connection part is a metal member, The electricity supply apparatus of the steel structure as described in any one of Claims 1-5.   The electrical connection device for a steel structure according to any one of claims 1 to 6, wherein the connection between the lower member of the arrangement portion and the steel structure is at least one of fastening, hooking, placing, and welding. .   The current-carrying device for a steel structure according to claim 1 or 2, wherein the connection between the lower member of the arrangement portion and the steel structure is via wiring. A steel structure energized from the anode in water to a steel structure placed in the ocean or brackish water,
An extending member extending from above to underwater so as to be disposed opposite to the steel structure, and the anode is disposed at a lower portion of the extending member via a connecting portion and connected to the steel structure so as to be conductive. A lower member to be provided,
A method of energizing a steel structure in which when the anode is energized, the steel structure and the lower member are electrically connected to form an electrodeposited film or cathodic protection on the connecting portion.   The method for energizing a steel structure according to claim 9, wherein the lower member is connected to the steel structure by at least one of fastening, latching, placing, and welding.   The method for energizing a steel structure according to claim 9, wherein the lower member is connected to the steel structure via a wiring.   The method of energizing a steel structure according to claim 11, wherein the lower member is submerged in the ocean or brackish water after the lower member is connected to the steel structure via wiring.

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