JP2016208807A - Instrumentation flange assembly and construction method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instrumentation flange assembly capable of being provided with stable power supply and a method of constructing the same.SOLUTION: A submarine power cable 50 is inserted into an instrumentation flange 20. Between an upper flange 21 and a lower flange 22, an armor wire 52 intervenes, which is a submarine power cable whose outer cover is detached and cut so that a constant length is exhibited and a ground current may be transmitted. At one side of the upper flange and the lower flange, an earth bolt 26 coupled with an external earth line 263 is configured to be coupled so that an earth current transmitted from the armor wire and the three-phase cable 54 of the submarine power cable is grounded externally. The lower flange is formed by an elliptic sphere and the lower surface of the upper flange is formed by an elliptic groove facing with the upper surface of the lower flange.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an instrument flange assembly installed at the end of a power transmission / distribution submarine power cable that has passed through the sea floor and has risen to land. More specifically, the present invention relates to a pole power pole, a marine steel tower, wind power, or a manhole. Before connecting the submarine power cable to the submarine, the submarine cable is fixed so that it can be grounded by blocking the upward pulling and vibration transmitted through the submarine power cable. The armor wire that is exposed by detaching the outer shell of the armor is bent and fixed backward so that it has the same radius of curvature as the instrumentation flange formed by a curved surface, increasing the ground contact area and folded. The armor wire is fixed with a tightening clamp to increase the durability of the connection part, etc. The upper flange and the lower flange are cut in the vertical direction, and the left side and the right side can be easily separated or joined to each other. It relates to the construction method.

  A submarine power cable is a power line that is installed to supply power across an ocean floor or to transmit power across a seabed from a wind generator installed on the sea. As shown in FIG. 1, the power distribution submarine power cable 50 includes a three-phase cable 54 formed of a conductor 541, a cable inner layer 542, a shielding layer 543, and a cable outer layer 544, and the three-phase cable 54 and the optical cable 55. The inner skin 53, the armor wire 52, the outer skin 51 and the like are successively formed to form a layer, and the inner skin and the outer skin can be formed as a multilayer through various materials.

  Common power cables are grounded for a number of safety purposes, including prevention of electric shock, suppression of potential rise during abnormalities, prevention of failures due to high-frequency noise, securing a reference potential, and prevention of dielectric breakdown due to abnormal voltages. The submarine power cable has a structure that cannot be easily grounded due to the unique installation environment. There are many grounding purposes other than those described above, but they are not so much related to the submarine power cable flange assembly.

  In other words, grounding ensures the safety of human lives and property, and is installed for stable system operation of various electrical and electronic equipment, but the submarine power cable has a ground-like potential at the ground or the potential difference is minimized. Since the ground current is continuously passed outside the main insulator of the armor wire and the three-phase power cable, the circulating current at the last termination point or the potential of the ground current becomes high. It can be seen that the high-potential circulating current or ground current of such a submarine power cable does not flow equally in various directions but flows irregularly and converges at one point, resulting in unstable electrical phase. .

  Currently, most of the instrumentation flange assemblies, which are the connecting materials for submarine power cable terminations used in Korea, are imported from Japan and the Netherlands. It is one of the main causes of power outage accidents by reducing the insulation life of submarine power cables.

  The instrument flange assembly is not an environment with great influence like tidal current and flow velocity like the cable laid on the seafloor, but it should ensure continuous tensile strength and waterproofing by weather, grounding efficiency Must be increased. Typical factors for improving the grounding efficiency of the submarine power cable include a connection cross-sectional area and conductivity.

  The connection cross-sectional area in the present invention is that an abnormal current flowing from the main insulator of the armor wire and the three-phase cable or a ground current such as an induced current generated from a magnetic field is applied to the instrument flange and the ground wire of the instrument flange assembly. The contact area for how well it flows.

Equation 1 below is a formula indicating the thickness of the grounding wire due to current, and it can be seen that the current (I) is proportional to the cross-sectional area (A). This is because there is no problem in the current flow if the contact area is large. In the case of offshore power cables, the contact area between the armor wire and the connection flange can be increased to facilitate the flow of ground current. it can.
[Formula 1]

A = the cross-sectional area of the ground wire,
I = current flowing in the grounding line (KA),
Tm = maximum allowable current (℃),
Ta = ambient temperature (℃),
Tr = Physical integer reference temperature (℃),
the thermal resistivity of the conductor when α0 = 0 ℃,
When αr = Tr, the thermal resistivity of the conductor,
Conductor resistivity (μΩ / cm ³ ) when ρr = Tr,
K ₀ = 1 / α0,
tc = standard time (S),
TCAP = heat capacity coefficient (J / cm ³ .C)

The conventional instrument flange assembly 120 shown in FIG. 2 is an instrument flange 121, 122 having a structure of two stainless steel rings, is a cylindrical shape that does not consider the curvature of the armor wire 123, and has a very limited connection cross-sectional area. Is. Also, the grounding method of the three-phase cable 124 is largely inferior in grounding function, and there is no separate connection outer case, so the function of the outer case is added by a heat shrinkable tube. This requires a long construction time by taping using rubber tape and insulating tape and covering a repetitive heat shrinkable tube.
Another type of conventional instrumentation flange assembly uses an outer box to reduce grounding efficiency and construction time, and the entire weight is provided by the outer box with a weight of 80 kg or more. It is difficult to work in a manhole near In addition, since the conventional instrument flange assembly is bulky, most of the conventional instrument flange assembly is assembled symmetrically on the left and right sides, but this acts as a cause of lowering the grounding efficiency than a single integrated type. Therefore, there is a problem that the ground cannot be grounded inside and the grounding work must be performed again, and there is a limit to the response to the tension of the submarine power cable to the sea side.

Conductivity is an indicator of how well a conductor will conduct electricity. The conductors with the best conductivity are silver (6.17 * 10 ⁷ ), copper (5.80 * 10 ⁷ ), gold (4.10 * 10 ⁷ ), chromium (3.85 * 10 ^7). ), Aluminum (3.82 * 10 ⁷ ), tungsten (1.82 * 10 ⁷ ), zinc (1.67 * 10 ⁷ ), brass (1.50 * 10 ⁷ ), nickel (1.45 * 10 ⁷⁾ ), Iron (1.03 * 10 ⁷ ), bronze (1.00 * 10 ⁶ ), platinum (9.52 * 10 ⁶ ), solder (7.00 * 10 ⁶ ), lead (4.56 * 10 ⁶⁾ ), Germanium (2.20 * 10 ⁶ ), steel (2.00 * 10 ⁶ ), and stainless steel (1.10 * 10 ⁶ ).

  The conventional instrument flange assembly of FIG. 2 is made of stainless steel ST304 and is useful for rust prevention, but the conductivity is not better than iron. In addition, since the tensile strength is such that the armor wire is pushed by two clamps, there is a limit in securing the wire firmly.

  Further, the conventional instrument flange assembly is made of iron as a basic material, and galvanization is formed there to generate environmental pollution. Since it is not semi-permanent, the corrosion rate increases after a certain period of time. Moreover, since the size of the upper plate was expanded by about the length of the iron wire (200 mm) in order to increase the contact cross-sectional area, the size of the outer box of the instrument flange assembly became larger than necessary.

  As described above, in order to increase the contact area between the low power cable and the instrument flange assembly, a method for increasing the size of the instrument flange assembly has been presented. The manufacturing cost is increased, the movement is troublesome due to the increased weight and volume, and the construction time is increased.

  Therefore, the instrumentation flange assembly and its construction method for the submarine power cable for power transmission and distribution according to the present invention form the instrumentation flange of the instrumentation flange assembly on a curved surface, and contact the armor wire with the submarine power cable on the curved surface. It is an object of the present invention to provide a device that increases the contact area and grounding efficiency by bending backward and fixing to a tightening clamp.

  In addition, the present invention makes it possible to strongly grip the submarine power cable even if a tensile force acts on the armor wire in the direction of the sea by contacting the outer box and the fastening clamp installed on the submarine power cable with a tapered surface. The purpose is to enable safe transmission of electric power by preventing pulling and preventing damage to the submarine power cable.

  In addition, the present invention has an instrumentation flange assembly that separates the upper part of the outer box in contact with the three-phase cable of the submarine power cable, and uses only the upper outer box depending on the size of the cable. The purpose is to improve.

  In order to achieve the above object, the instrument flange assembly in the submarine power cable for power transmission / distribution according to the present invention is connected to the power supply and the communication between the land and the structure installed on the sea through the seabed. An instrumentation flange assembly including an instrumentation flange for fixing a submarine power cable to a structure on the ground or on the sea and grounding a grounding current generated in the submarine power cable to the outside, and an outer box containing the instrumentation flange The instrument flange is configured to be separated into an upper flange and a lower flange so as to be fastened by bolts, and a through hole is formed in the center so that a submarine power cable can be inserted between the upper flange and the lower flange. The outer flange of the submarine power cable is detached and the ground current is transmitted via an armor wire that has been cut so that a certain length is exposed. Although one side of the lower flange is connected to a grounding bolt to which an external grounding wire is connected, the grounding current transmitted from the three-phase cable of the armor wire and the submarine power cable is configured to be grounded to the outside. And the lower surface of the upper flange is formed of an elliptical groove corresponding to the upper surface of the lower flange, and increases the contact area with the armor wire, and the upper flange and the lower flange are cut in the vertical direction respectively. The left side portion and the right side portion are formed to be separable or connectable.

  Preferably, a tightening clamp for fixing the end side of the armor wire to the submarine power cable is provided at a lower part of the instrument flange at a predetermined distance.

  More preferably, the outer box is formed with a through hole through which a submarine power cable is inserted at the center, and an outer box flange formed with a coupling hole fixed to a facility at the lower part, the instrumentation flange and the fastening A clamp pipe is included, tied to the outer flange, and a discharge pipe section with a reduced diameter is formed on the upper side so that only the three-phase cable exposed by removing the submarine power cable can be inserted. Is composed of an outer box formed with a grounding hole through which an external grounding wire is wired.

  The instrumentation flange assembly and its construction method in the submarine power cable for power transmission / distribution according to the present invention according to the above-mentioned solution means that the instrumentation flange is formed in a curved surface and the armor wire is bent in the reverse direction and continuously in contact with the instrumentation flange. As a result, the contact area is increased, the grounding efficiency is increased, and a stable power supply is possible.

  Also, by tightening the clamping clamp that fixes the armor wire by the outer casing flange and the tapered surface, if the tensile force pulling the submarine power cable acts in the ocean direction, the clamping clamp tightening part will be the annular projection of the outer casing flange The submarine power cable can be maintained safely by enhancing the durability, such as canceling the tensile force, by applying pressure along the taper surface in the direction of the central axis.

  In addition, the outer box body was separated from the upper outer box main body from which the three-phase cable was discharged, and only the upper outer box main body was replaced so that it could be installed according to the diameter of various submarine power cables and was peeled off. The submarine power cable is a useful device that saves the time required for taping and shortens the overall construction time by injecting a hardener into the outer box and solidifying it as a single body even if the taping work is not fine. And a construction method can be provided.

It is a schematic sectional drawing which shows the structure of a general submarine power cable. It is the schematic and photograph which show a conventional instrumentation flange. It is installation sectional drawing which shows the submarine power cable with which the instrumentation flange and fastening clamp of this invention were mounted | worn. It is the top view and sectional drawing which show the upper flange of the instrumentation flange which concerns on this invention. It is the top view and sectional drawing which show the lower flange of the instrumentation flange which concerns on this invention. It is a joint sectional view of an instrumentation flange constituted from an upper flange and a lower flange according to the present invention. It is the schematic which shows the top flange in which the slip prevention groove | channel or the slip prevention protrusion which concerns on this invention was formed. It is the top view and front view which show the clamping clamp of the instrumentation flange assembly which concerns on this invention. It is a separation sectional view showing the outer case concerning the present invention. It is the principal part enlarged view which carried out cross-sectional illustration of the coupling | bonding process of the outer box flange and fastening clamp which concern on this invention. It is installation sectional drawing which shows the state with which the instrumentation flange assembly which concerns on this invention was mounted | worn. It is a schematic installation figure which shows the example which mounted | wore the separation-type outer box main body which concerns on this invention. It is a top view which shows the other form of the outer case main body which concerns on this invention. It is a side view which shows the other form of the outer case main body which concerns on this invention. It is an effect | action state figure which shows the other form of the outer case main body which concerns on this invention.

  An instrumentation flange assembly according to the present invention fixes a submarine power cable that connects power supply and communication between structures on the ground or on the sea through the seabed to the structure on the ground or on the sea. An instrumentation flange assembly including an instrumentation flange for grounding a grounding current generated in a cable to the outside and an outer box containing the instrumentation flange, wherein the instrumentation flange is fastened by a bolt so as to be fastened by a bolt. Separately formed into flanges, through holes are formed in the center so that the submarine power cables can be inserted, and the outer shell of the submarine power cables is detached between the upper flange and the lower flange to express a certain length. The grounding current is transmitted through the armor wire that is cut so that the grounding bolt is connected to the external grounding wire on one side of the upper and lower flanges. Although it is configured to ground the ground current transmitted from the armor wire and the three-phase cable of the submarine power cable to the outside, the lower flange is formed of an elliptical sphere, and the lower surface of the upper flange is the upper surface of the lower flange. It is formed from a corresponding elliptical groove and is characterized in that the contact area with the armor wire is increased.

  In addition, a number of anti-slip grooves or anti-slip protrusions having concentric circles on one or both of the lower surface of the upper flange and the upper surface of the lower flange may be formed.

  Furthermore, a clamping clamp for fixing the armor wire end side to the submarine power cable is installed at the lower part of the instrumentation flange at a certain distance, and the armor wire folded in the opposite direction is attached to the lower flange of the instrumentation flange. The contact area can be increased by closely contacting the outer surface.

  The outer box has a through-hole through which a submarine power cable is inserted at the center, and an outer box flange formed with a coupling hole fixed to a facility at the lower part, and includes the instrumentation flange and the fastening clamp. The upper pipe is connected to the outer casing flange, and the upper part is formed with a discharge pipe part with a reduced diameter so that only the three-phase cable exposed by removing the submarine power cable can be inserted. It can comprise from the outer case main body in which the grounding hole by which this is wired was formed.

  At this time, a plurality of the clamping clamps extend to the lower part so as to cover the submarine power cable, but the extended outer surface is formed with a fastening part formed by a tapered surface inclined in the center direction, and the outer box flange is formed in the central part. Although an annular protrusion that protrudes upward and receives the tightening portion of the tightening clamp is formed, the inner surface of the annular protrusion forms a tapered surface corresponding to the tapered surface of the tightening clamp and acts on the submarine power cable. A tensile force can be exerted on the clamping clamp as a clamping force by the tapered surfaces of the clamping clamp and the outer casing flange.

  Such an outer box body is divided into an upper outer box body in which a discharge pipe part is formed and a lower outer box body containing an instrumentation flange, and the upper outer box in which the diameter of the discharge pipe part is variously configured. Only the main body can be replaced and installed for three-phase cables of various sizes.

  In addition, the construction method using the instrumentation flange assembly of the present invention was disclosed in a stage where the armor wire is exposed by removing the outer sheath from a point where the submarine power cable is separated from the end by a certain distance. The stage where the armor wire is clamped with the instrument flange and the distance tied to the clamp is calculated, the outer flange and seal ring are inserted into the submarine power cable, and the lower flange is installed on the submarine power cable. Install the lower flange of the instrumentation flange while preventing it from being pushed backward with the self-bonding tape, and remove the foreign matter attached to the surface of the armor wire so that the armor wire is in contact with the outer surface of the lower flange. Bend one at a time to remove the endothelium, and the upper flange on top of the armor wire folded in the opposite direction Inserting and fixing, and fastening the upper flange and lower flange with bolts, and fixing the end of the armor wire with the outer clamp of the submarine power cable using a clamping clamp Detaching a part of the outer sheath of the three-phase cable to expose the shielding layer, and connecting the grounding clamp to the exposed shielding layer and connecting the grounding bolt fixed to the upper flange with the internal grounding wire; and And connecting the external grounding wire to the grounding bolt of the upper flange, and moving the outer casing flange so that the tightening portion of the tightening clamp is sandwiched in the annular projection and fixed by the seal ring, and the outer casing body is fixed to the seabed It includes the steps of clamping the outer casing flange and bolts between the power cables, and injecting and integrating the curing agent into the internal space through the inlet on one side of the outer casing body. .

  Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the attached drawings are only examples for briefly explaining the contents and scope of the technical idea of the present invention, and the technical scope of the present invention is not limited or changed by this. In addition, it is obvious to those skilled in the art that various modifications and changes can be made within the scope of the technical idea of the present invention based on such examples.

  An instrumentation flange assembly used in the present invention fixes a submarine power cable that connects power supply and communication between a structure installed on land and the sea through the sea floor to a structure on land or on the sea. However, the position of the armor wire (Amour Wire) of the submarine power cable is fixed to prevent transmission of tensile force or vibration due to waves. In addition, the grounding current from the three-phase cable improves the conductivity by increasing the cross-sectional area of connection with the instrument flange, so that grounding is performed externally, and the three-phase cable is injected by injecting a curing agent through the outer box. It eliminates the taping process and enables rapid construction. Here, the instrumentation means a portion where the submarine power cable goes up on the sea surface and is grounded and fixed.

  The instrumentation flange assembly installed on the terminal end side of the submarine power cable according to the present invention includes an instrumentation flange for fixing the armor wire of the submarine power cable in the opposite direction.

  3 is a cross-sectional view of the instrumentation flange and the tightening clamp according to the present invention, FIG. 4a is a plan view and a cross-sectional view showing the upper flange of the instrumentation flange according to the present invention, and FIG. FIG. 4C is a cross-sectional view of an instrumentation flange including an upper flange and a lower flange according to the present invention.

  As shown, the instrumentation flange 20 is formed in a ring shape in which a through-hole through which the submarine power cable 50 is inserted is formed at the center, and is separated into an upper flange 21 and a lower flange 22.

  An armor wire 52 of a submarine power cable is interposed between the upper flange 21 and the lower flange 22, and the lower flange 22 is formed in a curved surface so as to have an elliptical spherical shape as shown in FIG. 4b. The armor wire 52 that bends in the opposite direction is bent in contact with the upper and side surfaces of the lower flange 22. The upper flange 21 is installed on the lower flange and is in close contact with the lower flange by bolt fastening.

  The lower surface of the upper flange is formed of an elliptical groove corresponding to the curved surface of the upper surface of the lower flange, and when the bolt is fastened, the armor wire interposed between the upper flange and the lower flange is strongly pressed and brought into close contact. At this time, the bolts of the upper flange and the lower flange are fastened by a plurality of bolt holes 23 as shown in the figure. However, various arrangements such as a concentric inner array and an outer array, or a single circle are used. It can be formed with a pattern.

  The instrument flange 20 is formed of a conductive metal material, improves the grounding efficiency by increasing the contact area with the armor wire 52, and transmits the ground current quickly through the armor wire to be grounded to the outside. So that Accordingly, the instrumentation flange 20 is integrally formed with a ground bolt 26 on one side of the upper flange 21 and connected to the external ground wire 263. The ground bolt 26 is composed of a three-phase cable and an internal ground wire of a submarine power cable. It is connected to H.262 so that external grounding is possible.

  Further, as shown in FIG. 4d, a plurality of anti-skid grooves 24 or anti-slip protrusions 25 having concentric circles on one or both of the lower surface of the upper flange 21 and the upper surface of the lower flange 22 are formed. The armor wire 52 can be more firmly fixed to the instrumentation flange 20. At this time, the upper flange 21 and the lower flange can be formed so as to engage with each other by forming an anti-slip groove on one side and forming a corresponding anti-slip projection on the other side.

  FIG. 5 is a plan view and a front view showing a clamping clamp of the instrument flange assembly according to the present invention. As shown in the drawing, the fastening clamp 30 according to the present invention can be formed into a semicircular shape and fastened as a set, or can be fastened as a circular shape with one side opened. Such a tightening clamp simultaneously fastens the submarine power cable 50 and the armor wire 52 in close contact with the outer surface of the submarine power cable to fix the armor wire and the submarine power cable together.

  Such a tightening clamp 30 can further be formed with a tightening portion 31 extending downward and tied to an outer box flange 41 described later. The fastening portions 31 of the fastening clamp protrude from the belt-like body in the lower direction where the outer box flange is connected, and are inserted into the annular protrusion 412 formed on the outer box flange 41. Here, the tightening portion 31 is formed by a tapered surface 311 having an outer surface inclined in the center direction and having a wide, narrow and narrow cone shape, and a tightening force toward the center is generated as it enters the annular protrusion 412 of the outer box flange. It can be so.

The instrumentation flange 20 and the fastening clamp 30 can be used semipermanently by spraying a nano material coating agent or a rust preventive agent on the outer surface to prevent corrosion.
FIG. 6a is a separated sectional view illustrating an outer box containing an instrumentation flange and a clamping clamp according to the present invention. As shown, the outer box 40 is formed with a through-hole through which the submarine power cable 50 is inserted at the center and an outer box flange 41 formed with a coupling hole to be fixed to a facility at the lower part, and the instrumentation flange. 20 and the fastening clamp 30 are comprised from the outer case main body 42 which is tied to an outer case flange.

  The outer box flange 41 has a disc shape and is formed with a plurality of bolt fastening holes 411 on the outer side so that the bolt fastening with the outer box main body 42 can be performed. 412 is formed.

  As shown in FIG. 6B, the annular protrusion 412 is formed along the outer surface of the inserted submarine power cable, and an expanded groove 413 is formed at the lower portion between the submarine power cable and the outer casing flange. While one or a plurality of seal rings 43 that prevent the generation of a gap are inserted, the outer casing flange is prevented from being pushed downward by the inserted seal rings.

  Further, a taper surface 414 corresponding to the taper surface 311 of the tightening clamp tightening portion is formed on the upper portion of the annular protrusion 412, and the taper surface 311 of the tightening clamp also descends along the taper surface 414 of the annular protrusion. While tightening inward, a stronger tightening force can be generated in the direction of the submarine power cable.

  The outer box flange 41 is formed to have a diameter larger than that of the outer box main body, and further formed with a plurality of bolt fastening holes on the outer side so as to be fastened and fixed to the facility by bolts. An annular protrusion 412 is also formed in the lower direction of the flange, and a bolt fastening hole 411 is formed in the annular protrusion protruding downward so that it can be fastened to the facility with a bolt. At this time, the facility can be fastened by installing the facility and the bottom of the outer casing flange so as to be separated from each other by a certain distance, thereby preventing the outer casing from being exposed to water flowing at the bottom of the facility.

  In addition, a finishing cap 415 is fixed to the lower stage of the annular projecting portion projecting from the lower portion, and then it can be combined with the facility. At this time, the outer casing flange is coupled with the facility cap, such as the bolt is inserted through the finishing cap and the outer casing flange is coupled with the facility. can do.

  Next, the outer casing main body 42 is formed with a discharge pipe portion 421 through which the three-phase cable 54 exposed with the armor wire removed by detaching the outer sheath and the inner skin of the submarine power cable is formed in the upper stage. A ground hole 422 into which the external ground line 263 is inserted is formed on one side.

  The discharge pipe portion 421 has a diameter that is formed so as to pass only through the three-phase cable and the optical communication cable and is smaller than the diameter of the portion including the instrumentation flange. A finishing cap can also be coupled to the upper stage of such a discharge pipe portion to maintain the confidentiality of the inner space of the outer box.

  Further, one or a plurality of hardener injection ports 423 are formed in the discharge pipe portion 421 of the outer box main body 42, and the hardener is injected into the space inside the outer box where the final assembly has been completed. Thus, the peeled portion can be protected without additional taping and can be applied quickly.

  As shown in FIG. 8, the outer box main body 42 is separated into an upper outer box main body 44 in which a discharge pipe portion is formed and a lower outer box main body 45 containing an instrumentation flange. A flange can be formed at the end of the box body that comes into contact with the box body, and the box body can be integrally formed by bolt fastening.

  As described above, the reason why the upper outer box main body 44 formed with the discharge pipe portion 421 is separated is to facilitate replacement of the discharge pipe portion related to the three-phase cables having various diameters. That is, since the three-phase cable of the submarine power cable has various cross-sectional areas of 60, 200, 400, 500, and 1000 square mm, an outer box in which a discharge pipe portion having a corresponding diameter is formed. The body must be installed.

  However, the method of replacing the entire outer box body due to the diameter of the discharge pipe part requires preparing a plurality of outer box bodies that occupy a large volume for each size of each discharge pipe part. Costs are required and storage and transportability are reduced. Therefore, by preparing only the upper outer box body 44 in which the discharge pipe portion is formed in various sizes and by using the lower outer box body 45 in a unified form, the deformation portion is minimized and the parts can be reduced. Preparation costs can be reduced and parts storage and transportability can be improved. The separation structure of the outer box body can be provided in a form in which only the discharge pipe part is detached, in addition to the form shown in the figure.

  In another embodiment of the outer box body 46 according to the present invention, as shown in FIGS. 9a, 9b and 10, the lower part can be formed in a cone shape. The outer box body 46 has a discharge pipe part 461 through which a three-phase cable is inserted, a horizontal pipe part 462 that is expanded outward from the lower stage of the discharge pipe part, and a diameter of the horizontal pipe part. The outer box main body comprises a cone-shaped main body receiving portion 463 that extends gradually but gradually decreases in diameter, and a lower flange portion 464 that extends horizontally outward from the lower stage of the main body receiving portion and is connected to the outer box flange. Is vertically divided into two parts, and a vertical flange part 465 is formed at the separated end, and the two outer box bodies divided into the two parts are connected.

  That is, the outer box body 46 is divided into both sides with respect to the vertical, and is divided into left and right in a state where the armor wire is fixed without being sandwiched in advance by being sandwiched between the submarine power cables in advance. A set of outer box bodies 46 can be fastened together so as to be in contact with both sides of the instrument flange.

  The outer box body 46 is filled after the coupling is completed by forming the upper part where the instrumentation flange 20 is located in the inside to have a large diameter and reducing the lower part to minimize the empty space inside. The amount of curing agent to be charged can be reduced.

  In addition, a plurality of bolt fastening holes 467 are formed in the horizontal expanded portion 462 of the outer box body, and can be fastened by an instrument flange and bolts. As shown in FIG. 10, the length of the bolt 27 to which the instrumentation flange 20 is coupled is extended so as to be exposed to the outside through the bolt fastening hole 467 of the outer box body, and a nut is coupled thereto, thereby coupling the instrumentation flange. 20 and the outer box main body 46 can be integrated. That is, the bolt 27 that connects the instrumentation flange and the outer box body is inserted upward from the lower stage of the lower flange 22, and the lower flange 22 and the upper flange 21 are inserted one after another and fastened by the first nut. Fix the flange.

  Next, the bolt 27 protruding above the upper flange 21 is coupled to the outer box body 46, but the bolt is inserted into the bolt fastening hole 467 so that the end of the bolt passes through the bolt fastening hole 467 of the outer box body. The instrumentation flange 20 and the outer box main body 46 can be integrated at a constant interval by fastening the second nut to the end of the main body. Also, the outer box body can be firmly configured by fastening the vertical flange between the pair of outer box bodies that are in contact with each other simultaneously with the fastening of the second nut. Here, the upper flange 21 and the outer box body 46 are fastened by fastening the bolts 27 protruding to the upper part of the outer box body after the pair of outer box bodies are fastened and fixed to the outer box flange 41 with the second nut. By fastening, the upper flange and the outer box main body can be separated and fixed as a unit.

  As shown in FIG. 7, the instrumentation flange assembly 10 in which the arrangement of the grounding wires is completed, the armor wire 52 is bent in the opposite direction by the instrumentation flange 20 and fixed to the fastening clamp 30, and the fastening portion 31 of the fastening clamp is The outer casing main body 42 includes the instrumentation flange 20 and the fastening clamp 30 and is connected to the outer casing flange 41 by being firmly fixed to the annular protrusion 412 of the outer casing flange by being connected to the tapered surfaces 311 and 414. Also, the three-phase cable is grounded to the outside by connecting the three-phase cable 54 and the grounding bolt 26 by an internal grounding line 262 and a grounding clamp 261 inside. By filling the empty space by injecting the curing agent into the outer box 40 with such a structure, the assembly of the instrument flange can be integrally formed on the cable without a separate taping operation.

  The construction method of the instrumentation flange assembly according to the present invention is to first cut the laid submarine power cable after calculating the distance from the position where the instrumentation flange assembly is installed to the upright pillar, A step is performed in which the armor wire is exposed by removing the outer skin from a point separated from the end by a certain distance.

  The exposed armor wire is cut by calculating the distance tied to the clamp through the instrument flange. Generally, about 500 mm of armor wire remains. First, insert the outer box flange and seal ring into the force cable. Then, the part where the lower flange is installed in the submarine power cable is wound 8-15 times with self-adhesive tape to prevent the lower flange from being pushed backward in the construction process, and the lower flange of the instrumentation flange is inserted and installed. To do. This stage includes the step of removing the asphalt layer, which is a foreign substance on the surface of the armor wire, using a blade or a solvent, and the submarine power cable of 300 to 400 mm length from the point where the lower flange is located to the rear. A step of wrapping the skin with rubber tape to protect the skin is included.

  Thereafter, the remaining foreign matter on the surface of the armor wire is removed, and the endothelium is removed by bending the armor wire in a reverse direction one by one so as to contact the outer surface of the lower flange. Here, before the armor wire is completely bent, a point of 300 mm from the lower flange is displayed and cut with a cutting machine.

  Subsequently, the upper flange is inserted into the upper part of the armor wire folded in the opposite direction to be seated, and the upper flange and the lower flange are fastened with bolts so that the armor wire is fixed so as not to move.

  When the coupling of the instrument flange is completed, the end of the armor wire is fixed so as to be in close contact with the outer sheath of the submarine power cable by using a tightening clamp. The ends of the fixed armor wires can be arranged by winding them with insulating tape or rubber tape.

  Further, a ground clamp is coupled to the shielding layer that is exposed by removing a part of the outer sheath of the three-phase cable, and is coupled to a ground bolt fixed to the upper flange with an internal ground wire. Here, the outer cover of the three-phase cable is connected to the shielding layer that is exposed after being detached by about 50 mm. In addition, an external ground wire is connected to the ground bolt of the upper flange to ground the upper flange to the outside.

  When the connection of the grounding wires is completed, the outer casing flange is moved and coupled so that the fastening portion of the fastening clamp is sandwiched in the annular projection. At this time, the seal ring is inserted into the groove at the bottom of the outer casing flange and fixed. Also, insert the outer box body into the submarine power cable and wire the external grounding wire outside the outer box body so that the instrumentation flange is enclosed inside the outer box body and the lower stage and outer box flange of the outer box body Fasten the bolts.

  When the installation of the outer box is completed, a hardening agent is injected into the inner space of the outer box through an injection port formed on one side of the outer box body, and the inside of the outer box is filled with the hardening agent. Here, a plurality of the injection ports are formed, and the curing agent is injected and charged through the injection port on one side in a state where the outer box is set up vertically, and the air inside the outer box is discharged to the other injection port. The hardening agent can be easily injected into the box, and the internal structure is integrated by solidification of the injected hardening agent, thereby completing the installation of the instrument flange assembly.

  The present invention is used in the industry for constructing an instrument flange assembly and an instrument flange assembly.

DESCRIPTION OF SYMBOLS 10 Instrumentation flange assembly 20 Instrumentation flange 21 Upper flange 22 Lower flange 23 Bolt hole 24 Anti-slip groove 25 Anti-slip protrusion 26 Ground bolt 27 Bolt 261 Ground clamp 262 Internal ground line 263 External ground line 30 Tightening clamp 31 Tightening part 311 Tapered surface 40 Outer box 41 Outer box flange 42,46 Outer box body 43 Seal ring 44 Upper outer box body 45 Lower outer box body 411, 467 Bolt fastening hole 412 Annular projection 413 Groove 414 Taper surface 415 Finished cap 421 461, Drainage pipe part 422 Ground hole 423 Inlet 462 Horizontal expansion part 463 Main body reception part 464 Lower flange part 465 Horizontal flange part 50 Submarine power cable 51 Outer skin 52 Armor wire 53 Endothelial 54 Three-phase cable 55 Optical cable 541 Conductor 542 Cable inner layer 543 Shielding layer 544 Cable outer layer

Claims (8)

  A ground current generated in the submarine power cable by fixing the submarine power cable for power transmission / distribution that connects the power supply and communication between the structure installed on land and the sea through the sea floor and fixed to the structure on land or sea. In an instrument flange assembly including an instrument flange for grounding to the outside and an outer box containing the instrument flange, the instrument flange is separated into an upper flange and a lower flange so as to be fastened by a bolt. The armor is formed such that a through hole is formed in the center so that the submarine power cable is inserted, and the outer shell of the submarine power cable is detached between the upper flange and the lower flange so that a certain length is exposed. A grounding current is transmitted via a wire, and a grounding bolt that is connected to the external grounding wire is connected to one side of the upper flange and the lower flange to connect the armor. Although it is configured to ground the ground current transmitted from the three-phase cable of wire and submarine power cable to the outside, the lower flange is formed with an elliptical sphere, and the lower surface of the upper flange corresponds to the upper surface of the lower flange It is formed with an elliptical groove that increases the contact area with the armor wire, and at the bottom of the instrumentation flange is installed a clamping clamp that fixes the armor wire end to the submarine power cable at a certain distance. The armor wire folded in the opposite direction is brought into close contact with the outer surface of the lower flange of the instrument flange, the contact area is increased, and the upper flange and the lower flange are cut in the vertical direction respectively, and the left side and the right side An instrumentation flange assembly characterized in that is formed to be separable or connectable.   The instrumentation flange according to claim 1, wherein a plurality of anti-slip grooves or anti-slip protrusions having concentric circles are formed on one or both of the lower surface of the upper flange and the upper surface of the lower flange. Assembly.   The outer box has a through-hole through which a submarine power cable is inserted at the center, and an outer box flange formed with a coupling hole to be fixed to a facility at the bottom, and includes the instrumentation flange and the fastening clamp. It is connected to the outer casing flange, and the upper stage is composed of an outer casing body in which a discharge pipe portion with a reduced diameter is formed so that only the three-phase cable that is exposed by removing the submarine power cable is inserted. The instrumentation flange assembly according to claim 1.   A plurality of the fastening clamps extend to the lower part so as to cover the submarine power cable, but the extended outer surface is formed with a fastening part formed by a tapered surface inclined in the center direction, and the outer box flange is an upper part in the central part. Although an annular protrusion is formed to protrude to receive the tightening portion of the tightening clamp, the inner surface of the annular protrusion forms a tapered surface corresponding to the tapered surface of the tightening clamp, and the tensile force acting on the submarine power cable is 4. The instrument flange assembly according to claim 3, wherein the tightening clamp and the taper surface of the outer casing flange act as a tightening force on the tightening clamp.   The outer box body is constituted by separating the upper outer box body in which the discharge pipe portion is formed and the lower outer box body containing the instrumentation flange, and only the upper outer box body in which the diameter of the discharge pipe portion is variously configured. The instrumentation flange assembly according to claim 3 or 4, wherein the instrumentation flange assembly can be installed in correspondence with various sizes of three-phase cables.   The outer box main body extends to the lower part from the drain of the discharge pipe part through which the three-phase cable is inserted, the horizontal pipe part that is expanded outward from the lower stage of the discharge pipe part, and the diameter of the horizontal pipe part, Consists of a cone-shaped main body receiving portion that gradually decreases in diameter and a lower flange portion that extends horizontally outward from the lower stage of the main body receiving portion and is connected to the outer box flange. 5. An instrumentation flange assembly according to claim 3 or 4, wherein a vertical flange portion is formed at the separated end portion, and the two outer box main bodies separated from each other are joined together.   The instrument flange assembly according to claim 6, wherein a plurality of bolt fastening holes are formed in the horizontal expansion portion of the outer box main body to be fastened with the instrument flange.   The upper and lower flanges are cut into the vertical direction, and the left and right sides are separated or joined together, and the end of the armor wire is connected to the instrument flange with a curved surface. In the construction method of the instrumentation flange assembly according to the present invention, including the outer clamp composed of the tightening clamp to be fixed, the outer casing flange containing the instrumentation flange, and the outer casing body, the submarine power cable is fixed distance from the end. Detaching the outer skin from a remote location so that the armor wire is exposed, tightening the exposed armor wire through the instrument flange, calculating the distance that connects to the clamp, and cutting the seabed power Insert the outer box flange and seal ring into the cable, and wrap the part where the lower flange is installed in the submarine power cable with self-adhesive tape The bottom flange of the instrumentation flange is installed, the foreign matter on the surface of the armor wire is removed, and the armor wire is bent one by one in the opposite direction so that it touches the outer surface of the lower flange. The step of removing the endothelium, the step of inserting the upper flange into the upper part of the armor wire folded in the opposite direction to be seated, the upper flange and the lower flange being fastened together with bolts, and the armor using the tightening clamp Fix the end of the wire so that it is in close contact with the outer sheath of the submarine power cable, and detach the fixed portion of the outer sheath of the three-phase cable to expose the shielding layer, and connect the grounding clamp to the exposed shielding layer And connecting the grounding bolt fixed to the upper flange with the internal grounding wire, connecting the external grounding wire to the grounding bolt of the upper flange, The stage is moved so that the fastening part of the clamping clamp is sandwiched in the annular projection and fixed with a seal ring, and the outer box body is sandwiched between the submarine power cables and bolted to the outer box flange. And a step of injecting a curing agent into the internal space through the side injection port and integrating them.

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