JP2008245340A - Cable protective tube, and submarine cable laying method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a submarine cable protective tube with which a cable can be positively laid from a cable laying ship, workability can be improved and damage of the protective tube itself and the cable itself due to the bending of the protective tube can be prevented, and to provide a submarine cable laying method using the protective tube. <P>SOLUTION: The cable protective tube is provided with a hook device capable of engaging/disengaging a guide wire on the external circumferential surface of a tube body having connecting portions each formed on both ends of a tube axis direction, and the method of laying a submarine cable uses this cable protective tube. The hook device provided on the external circumferential surface of the protective tube is provided with a guide wire disengagement protecting mechanism which works so as to close the opening of the hook device while the hook device is receiving the application of a load outside of a substantial normal line for the external circumferential surface of the protective tube via the guide wire and to open the opening after the load is not applied. The tube body consists of a pair of halved tube bodies. One can rotate for the other centered at a hinge, the other having an engaging means on its side edge. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cable protective pipe (hereinafter, simply referred to as a protective pipe) that is attached to protect the cable when a cable is laid from the cable laying base ship to the sea floor, and a seabed using the cable protective pipe. The present invention relates to a cable laying method.

  Usually, the submarine cable needs to be provided with a predetermined protection so as not to be damaged by the bottom fishing gear or the throwing of a ship. When laying submarine cables, it is common to protect by digging a trench in the submarine board and burying the cable in it. It is necessary to produce. Therefore, in the submarine cable laying work in a short length, the submarine cable is protected by a relatively inexpensive method of attaching a protective pipe to the cable without using such a digging and burying machine.

  When installing a protective pipe to a cable, in a sea area where the water depth is relatively small, such as in the near sea, where a cable laying base boat cannot enter, the cable is laid in advance on the sea floor, and the cable is installed by diving work by a diver. In the sea area where the cable laying base ship can enter, the protection pipes are sequentially attached from one end to the cable mounted on the cable laying base ship. Then, a method is adopted in which the cable that has been attached is drawn out of the ship and sunk into the sea and laid on a predetermined route on the sea floor.

  However, when a cable equipped with a protective pipe is submerged from the cable laying base ship, the tide may be intense depending on the sea conditions, and the laying cable may meander or loop, and a large horizontal load may be applied to the laying cable. . In this case, the laying cable cannot be laid on the planned route, the series of protective pipes are bent excessively, and the fittings that fasten the pair of half pipes constituting the cable are damaged or fallen off, The tube itself could be damaged, and thus the cable protected by it.

  Several proposals have been made to solve such problems. For example, Patent Document 1 discloses a long body guide tube in which a protective body is attached to a long body such as a cable on a laying ship, and the long body on which the protective body is mounted is inclined downwardly from the laying ship to the seabed. An elongate seabed laying method for laying while guiding the seabed through the inside is disclosed.

  However, in this technology, the guide tube needs to adjust the drooping depth of the guide tube in the sea by changing the water depth in the sea area where the long body is installed. It is necessary to investigate the water depth of the sea area in advance because it may be damaged by contact with water. In addition, the guide tube must be separately loaded on a laying table ship when laying a long body on the seabed, and there is a problem that its production is expensive in the first place.

  Furthermore, in this technique, in order to collect the long body guide tube, wires are suspended from the sea side and the sea bottom side of the guide tube. Normally, when laying such a long body, a load may be applied to the long body from all directions due to the drooping state of the long body, the progress of the laying ship and changes in tidal current. Yes, when two wires are suspended as described above, it is expected that these wires will be mixed, and not only will it become difficult to collect the wires after laying the long body, but also the long body laying operation itself There is also a risk of trouble.

  Further, particularly in Patent Documents 2 and 3, the protection pipe is separated from the laying ship into the sea and suspended by the suspending means via the device, and the cable to be laid is passed through the protection pipe to the seabed side. A technique is disclosed in which the cable is protected by guiding the laying operation, operating the disconnecting device at a point to be protected, separating the protection from the suspending means, and landing on the seabed.

  However, although the techniques according to these documents are suitable for attaching a protective pipe to a part that needs protection of a cable laid on the seabed, there is a part that needs protection over a long distance. In this case, it is necessary to repeat the work of attaching the protective pipe connected to a predetermined length by raising and lowering the suspension means to the tip, which increases the labor required for cable laying work and increases the work time. . In addition, as disclosed in these documents, when a steel cable is used as the suspending means, the steel cable is arranged along the cable, so there is a concern that the steel cable and the submarine cable may be mixed.

In the technique of Patent Document 2, a control current is supplied to the disconnecting device, and this is operated to disconnect the protective tube attached to the cable from the suspension means. For this purpose, control is performed separately from the cable. When a cable needs to be stretched and this control cable and the suspension means may be mixed, when an explosive is installed in the disconnecting device and the protective tube is disconnected by detonating it Requires coating with seawater-resistant coatings as the sheath of the submarine cable, which necessitates an increase in cable thickness and weight, and nevertheless the possibility of submarine cable damage due to an explosion. Is large and may adversely affect the fishery in the surrounding waters.
JP 53-45209 A Japanese Patent Laid-Open No. 53-1224797 JP-A-53-124798

  Therefore, the present invention solves the above-mentioned problem, and even when the water depth changes in the sea area where a cable laying base can enter, it is possible to lay a cable with a protective pipe attached to the seabed without any trouble. The cable can be prevented from being routed out of the planned route due to the meandering of the installed cable, and damage to the protective tube itself and the cable itself due to bending of the protective tube can be prevented, improving the workability of cable installation work. It is an object of the present invention to provide a submarine cable protective pipe that can be used, and a submarine cable laying method using the protective pipe.

  In order to achieve the above object, according to one aspect of the present invention, in a cable protection tube including a tube main body formed with connecting portions at both ends in the tube axial direction, a guide wire can be hung on and off the outer peripheral surface of the tube main body. Provided is a cable protection tube provided with a simple hook device.

  The hook device can be fixed directly or indirectly to the outer peripheral surface of the tube body.

  Further, it is preferable to use a hook device provided with a wire detachment preventing portion that can restrict the escape of the guide wire from the device once the guide wire is hooked on the hook device. More preferably, the wire detachment preventing portion closes the opening of the hook device while the hook device receives a load directed outward in the normal direction of the protective tube via the guide wire, and It is possible to operate so as to open the opening after there is no more.

  If the tube body can be attached to a cable and cover the outer peripheral surface of the cable, the external shape is not particularly limited, and the tube wall is provided with a cut for inserting the cable along the tube axis direction or the direction. It can be set as the structure which consists of a pair of half pipe body divided | segmented into 2 to. When the latter pair of half pipes are used as the protective pipe body, hinges are provided on the opposite side edges, and one half pipe turns with respect to the other around the hinge. Can be possible. In this case, the other side edge is provided with a locking means capable of easily fixing the half pipes in a state where both end faces of the half pipes are in contact with each other. It is possible to improve the efficiency of the work of installing the protective pipe to the cable.

  Further, according to another aspect of the present invention, there is provided a submarine cable laying method using a cable laying base ship, wherein the cable protection pipes are connected to each other and attached to cables mounted on the ship, A guide wire, one end of which is fixed to the laying base point in advance, is passed through the hook device of the protective pipe, and the cable after the protective pipe is attached together with this guide wire is successively drawn out of the ship and submerged in the sea, and is set on the seabed. After the distance is laid, there is provided a method for laying a submarine cable, wherein the guide wire is removed and recovered from the protective pipe laid on the seabed.

  The protective tube of the present invention has a simple structure in which a hook device is provided on the outer peripheral surface of the cable protective tube so that the guide wire can be hooked / removed, and the guide wire is directly hooked on the protective tube via the hook device. When submerging a cable equipped with a cable, the submarine cable can be installed in a predetermined installation route without causing the cable to meander, and the load applied to the cable can be distributed by a protective tube and a guide wire. Therefore, damage to the protective tube and damage to the outer peripheral surface of the cable can be prevented.

  In addition, the protective tube of the present invention is such that the protective tube is attached to the cable so that the hook device faces in the same direction, and the guide wire is passed through the individual hook device fixed to the individual protective tube. Since the cable equipped with the protective tube is guided by only one guide wire, it is difficult for the guide wire to be mixed.

  Embodiments of a cable protection tube according to the present invention will be described below in detail with reference to the accompanying drawings. In the following drawings, the same reference numerals are used for the same or common parts, and hereinafter “upper and lower” are used in the upper and lower senses in the drawings.

  In the cable protective tube of the present invention, a known cast iron protective tube or polyurethane protective tube can be used as the protective tube body. FIG. 1 shows an example of an embodiment of a cable protection tube of the present invention using a cast iron protection tube as a protection tube body. In this figure, (a) is a side view, (b) is a plan view, and (c) is a front view.

  Both ends of the protective tube main body 2 in the tube axis direction are expanded, and female connection portions 21a and 22a and male connection portions 21b and 22b are formed, respectively. The female and male connecting portions 21a and 22a and the male connecting portions 21b and 22b are connected to the female and male connecting portions of adjacent protective pipes (not shown) having the same shape along the tube axis directions. As a result, a series of protective tube trains are formed.

  The protective tube main body 2 is also composed of half pipes 21 and 22 which are divided into two in the pipe axis direction, and these half pipes are connected to both side edges of the half pipes 21 and 22. An end surface (joint surface) for abutting is formed. The side flanges along the tube axis of each of the half pipes 21 and 22 and the side edges of the female connecting portions 21a and 22a intersecting at right angles to the side flanges 21c and 21d are substantially rectangular flat plate-like connection flanges 21c and 21d. ; Adjacent side surfaces of 22c and 22d are fixed. These connection flange portions are each formed with a bolt through hole penetrating the front and back at substantially the center, and a pair of half pipes 21 and 22 are combined so that the joint surfaces are in contact with each other. After the bolt 3 is inserted into the bolt through hole and the nut 4 is screwed and tightened, the protective tube body 2 that covers the peripheral surface of the cable is formed.

  On the outer peripheral surface of the female connecting portion 21a at one end in the tube axis direction of the protective tube main body 2, a hook device 5 having a wire disconnection preventing portion 6 described later is provided. The method for fixing the hook device 5 to the outer peripheral surface of the protective tube body 2 is not particularly limited, and for example, a known fixing tool such as a bolt and a nut may be used, or a method such as welding may be used.

  Examples of hook devices used in the cable protection pipe of the present invention are shown in FIGS. In each of the hook devices 5 shown in the drawings, a guide wire is hung on the hook device 5 so that the opening is closed when a load is applied outward in the normal direction of the protective tube, and the opening is opened when the load is removed. It is provided with a wire detachment preventing portion 6 that operates in the same manner. In these drawings, (a) is a front view showing a state before the operation of the wire detachment prevention unit 6, and (b) is a front view showing a state after the operation.

  The hook device 5 shown in FIG. 2 is formed between two hook members 51 and 52 having the same shape of a substantially inverted J (hook bolt) shape in front view in which one end side of a rod-shaped body having a rectangular cross section is curved in a semicircular shape. The hook member 33 having the wire detachment preventing portion 6 is interposed. In order to show the relationship between these members, FIG. 2 shows a bottom view of the hook device 5 as (c).

  Similar to the hook members 31 and 33, the wire detachment preventing portion 6 has a semicircular curved portion on one end side, and is provided on the other end so as to face the distal end surface of the curved portion via a support piece 34. Further, it has a structure in which a part of a substantially D-shape in front view provided with the anti-separation claw 35 is cut out. An elastic body such as a spring (not shown) can be attached to the wire detachment preventing portion 6 and urged toward the protective tube along the normal direction. In FIG. 2, the hook device 5 is hung with a guide wire 30 and a lower portion that does not interfere with the operation of the wire detachment preventing member 6 is accommodated in the housing. Good.

  The guide wire 30 is hung on the hook device 5, and the hook device 5 receives an outward (upward) load along the normal direction of the protective tube via the guide wire 30, thereby preventing the wire detachment prevention unit 6. Is lifted in the same direction (against the urging force of the elastic body if it is provided with an elastic body), and the opening of the hook member 31 is prevented so that the disengagement-preventing claw 35 that is a part thereof prevents the guide wire 30 from escaping. Block. On the contrary, in the state where the load is lost, the wire detachment preventing member 6 moves to the protective tube side (downward as viewed in the drawing), the wire detachment preventing claw 61 is lowered, and the opening of the hook member 31 is opened. To do.

  FIG. 3 shows another example of the hook device. The hook device 5 shown in this example includes a mounting base 8 attached to the outer peripheral surface of the protective tube main body 2, a hook member 31 protruding from the upper part thereof so as to be movable up and down, and a wire detachment prevention fixed to the hook member 31 so as to be rotatable. Part 6. Inside the protective tube mounting base 8, a shaft is fixed in a direction perpendicular to the normal direction of the protective tube main body 2, and a gear 38 that is rotatable around the shaft center is provided on the shaft. The hook member 31 has a rack 39 engraved on the peripheral surface of the straight portion 311 along the length thereof, and engages with the gear 38 to restrict the vertical movement of the hook member 31 in one direction. .

  Further, in the straight portion 311 of the hook member 31, a through-hole penetrating the straight portion 311 from the front toward the back toward the drawing is formed above the rack 39 and is inserted into the through-hole. A wire detachment preventing claw 40 is rotatably fixed via a fixture 36. The illustrated wire disconnection preventing claw 40 has a quadrangular cross section, but is not limited to this cross sectional shape, and may have other shapes.

  A metal tape fixing tool 42 is provided on the upper surface of the wire disconnection preventing claw 40, and one end of the metal tape 41 is fixed to the fixing tool 42. The other end of the metal tape 41 is similarly fixed to the outer peripheral surface of the hook member 31 via a metal tape fixture 44. The length of the metal tape 42 is set to such a length that the wire detachment preventing claw 40 that rotates as the hook member 31 moves up comes to a position that closes the opening of the hook device 31.

  The material of the hook device 5 is not particularly limited as long as it has a strength that does not break when subjected to a load via a guide wire hung on the hook device 5 as described later. For example, it can be made of steel, cast iron or plastic.

  In the hook device 5 shown in FIG. 3, when a guide wire 41 is passed through the opening and a load is applied upward through the guide wire 41 toward the drawing, the hook member 31 is attached to the protective tube from the mounting base 32. It is drawn outward (upper side) along the normal direction. As the hook member 31 is pulled out, the bent portion of the metal tape 41 is stretched, and further, the hook member 31 is pulled upward, so that the wire disconnection preventing claw 40 is rotated upward, and the hook member The opening of 31 is closed.

  In the state where the load via the guide wire is lost, the hook member 31 that has been pulled out is lowered downward, and the wire detachment preventing claw 40 is rotated downward, and the metal tape is bent. The opening of the hook member 31 is opened.

  FIG. 4 shows still another example of the hook device. In the hook device 5 shown in this figure, a hook member 31 having a substantially inverted J shape when viewed from the front is accommodated in the housing 8 with a straight portion 311 including a base 312. Between the top plate 62 of the housing 8 and the base 312 of the hook member 31, springs 46 and 47 are built in, and these springs 46 and 47 attach the hook member 31 to the protective tube side (downward). It is fast. On the upper end of the side wall 62 of the housing 8, a wire detachment preventing claw 40 is rotatably fixed via a fixing tool 45 inserted through a through hole penetrating from the front side to the back side of the drawing. A metal tape fixture 42 is provided on the upper surface of the wire disconnection prevention claw 40, one end of the metal tape 41 is fixed to the fixture 42, and the other end is attached to the outer peripheral surface of the hook member 31. It is similarly fixed via a fixture 44 for use.

  A guide wire 30 is hung on the hook member 31 of the hook device 5 shown in FIG. 4, and an outward load (upward in the drawing) is applied along the normal direction of the protective tube via the guide wire 41. In this case, the hook member 31 is pulled out from the housing 8 in the same direction. As the hook member 31 is pulled out, the metal tape 41 connected to the fixture 43 of the linear portion 311 is pulled upward, and as a result, the wire disconnection prevention claw 40 rotates upward via the fixture 42. Then, the opening of the hook member 31 is closed.

  Next, when the load is lost, the hook member 31 is pulled back downward by the springs 46 and 47 inside the housing 8. At the same time, the metal tape 41 also moves downward, the wire disconnection prevention claw 40 rotates downward, and the opening of the hook member 31 is opened.

  FIG. 5 shows still another example of the hook device. The hook device 5 shown in this figure circulates in the space inside the hook member 31 via a hook member 31 having a base 312 attached to one end of the protective tube body at one end and a fixture 36 fixed to the linear portion 311 thereof. It consists of a wire detachment preventing portion 6 fixed so as to be movable. The wire detachment preventing portion 6 has a substantially V-shape composed of a wire engaging member 50 and a wire detachment preventing member 51 extending bifurcated from a portion where the through hole of the fixing tool 36 is formed. The distal end side of the engaging member 50 is curved downward toward the wire detachment preventing member 51 facing the engaging member 50. Further, the other end of the spring 52 whose one end is fixed in the base 312 is fixed to the outer peripheral surface of the wire detachment preventing member 51, and the wire detachment preventing unit 6 is moved toward the protective tube main body 2 by the spring 52. It is energized.

  In the hook device 5 illustrated in FIG. 5, a guide wire 30 is hung on the opening of the hook member 31, and outwards along the normal direction of the protective tube body 2 via the guide wire 41 (toward the drawing). When a load is applied, the guide wire 30 rotates the wire engaging member 50 in the same direction. Accordingly, the wire detachment preventing portion 6 also rotates in the same direction, and the opening of the hook member 31 is blocked.

  Next, when the load is lost, the hook detachment preventing portion 6 is pulled back by the spring 52, the opening of the hook member 31 is opened, and the guide wire 30 in the opening is also pushed downward.

  The hook device 5 exemplified above is not particularly limited as long as it has a strength that does not break when subjected to a load through a guide wire hung on the hook device 5 as will be described later. For example, it can be made of steel, cast iron, plastic or the like.

  By providing such a guide wire detachment prevention mechanism in the cable protection tube, when the cable with the protection tube is submerged in the sea, the cable is guided by the guide wire until it reaches the bottom of the sea, Even when receiving a horizontal load due to a tidal current, the load can be distributed and received by the guide wire and the protective tube, so that there is an advantage that damage to the protective tube and damage to the outer peripheral surface of the cable can be prevented. In particular, in the hook device 5 of FIGS. 3 to 5, when the load through the guide wire 30 is lost, the metal tape 41 or the wire detachment preventing member 51 helps the guide wire 30 to escape from the hook member 31. The guide wire 30 can be easily pulled out in the horizontal direction.

  FIG. 6 shows a modified form of the method of joining the end faces of the pair of half pipes 21 and 22 constituting the protective pipe body in place of the connection flange portion of the embodiment shown in FIG. The other configurations such as the outer shape of the pair of half pipes 21 and 22 are essentially the same as those of the embodiment shown in FIG. In this embodiment, any of the hook devices 5 illustrated in FIGS. 2 to 5 can be fixed to the outer peripheral surface of the protective tube main body.

  As shown in FIG. 6, the hinge 17 is connected to the outer periphery of each of the half pipes 21 and 22 so as to connect one side edge region facing along the tube axis direction of the female connecting portions 21 a and 22 a. It is fixed to the surface, and one half pipe is rotatable with respect to the other about the hinge 17. Moreover, the other opposing side edge of these half pipe bodies 21 and 22 is provided with the latching means 7 which can fix both in the state which faced each other.

  The locking means 7 is fixed to the side edge surfaces of the female connecting portions 21a and 22a in the pair of half pipes 21 and 22, respectively, and U-shaped notches 111 and 121 are provided in the center. A pair of substantially rectangular flat plate-shaped connection flange portions 11 and 12 and a pair of lower surfaces of the connection flange portion 12 fixed to the half pipe body 22 so as to sandwich the U-shaped cutout portion 121. A shaft support piece 13, a long bolt 15 fixed to a middle region of the shaft 14 pivotally supported by the pair of shaft support pieces 13 at a right angle, and rotatable about the shaft 14; The wing nut 16 is screwed into the long bolt 15.

  From a state in which the pair of half pipes 21 and 22 are opened via the hinge 17 fixed to these side edges, the one half pipe 21 is rotated around the hinge 17 to thereby rotate the other half 22. Then, the long bolt 15 is rotated around the axis of the shaft 14 to engage with the U-shaped cutouts 111 and 121 of the connection flange portions 11 and 12. The two half pipes 21 and 22 are fixed by screwing and tightening the nuts. Instead of the wing nut and the long bolt, a wing screw may be used together with the nut that protrudes from the shaft in a direction away from the opposing surface of the side wall of the nut.

  Conventionally, a cast iron protective pipe has a large weight per piece and is composed of a pair of half pipes divided into two in the direction of the pipe axis. Since it has a sandwiched structure, and bolts and nuts prepared separately for joining these half pipes had to be inserted through the insertion holes provided in the flange, one protective pipe is attached to the cable. This takes time, and the work efficiency is poor, and it is a heavy burden for the workers engaged in the mounting work. As described above, a pair of half pipes 21 and 22 are connected by a hinge, and both can be joined using a wing nut (or wing screw), so that the cast iron protective pipe is attached to the cable. Can be easily performed, and work efficiency can be improved. In addition, the work efficiency can be further improved by reducing the weight by forming the peripheral wall of the half pipe body thin as described above.

  FIG. 7 shows another embodiment of the cable protective tube of the present invention, in which a protective tube made of polyurethane is used for the protective tube body, and a hook device is provided on a binding tool attached to the outer peripheral surface thereof. This protective tube 1 made of polyurethane is composed of a pair of elongated half pipes 21, 22, and usually projections (on both side edge surfaces along the pipe axis direction of either half pipe body) (Not shown) is provided, and a recess (not shown) is provided on the end face of the other half pipe corresponding to the projection. When these protrusions and recesses are fitted together, when a pair of half pipes are butted end-to-end and joined to form a tubular shape, one half pipe is in the direction of the tube axis with respect to the other It is designed not to slip. By adjusting the positions of the protrusions and the recesses on the end face of the half pipe, for example, the half pipes 21 joined to the half pipe 22 can be arranged in a staggered manner. .

  The tube body obtained by joining the pair of half pipes 21 and 22 in this way is fixed by the binding tool 23. The binding tool 23 is not particularly limited as long as the material has good corrosion resistance, and a known binding tool can be used. In the present embodiment, as shown in FIG. 3, the hook device 5 including the wire detachment preventing portion 6 is provided on the surface of the binding tool 23 instead of being directly fixed to the tube body. As the hook device 5, any of those illustrated in FIGS. 2 to 5 can be preferably used.

  Next, a submarine cable laying method using the cable protection tube of the present invention will be described. FIG. 8 is an explanatory diagram of a method for laying a cable on the seabed using the cable protection tube of the embodiment shown in FIG. As shown in this figure, on the cable laying base boat 31, the hook device 5 provided with the protective tube 1 on the outer peripheral surface of the cable 50 is successively beaded so as to face in the same direction (for example, upward). Install it.

  The guide wire 30 having one end fixed to the cable laying base point is passed through the hook device 5 of each protective tube 1, and the feeding speed of the cable 50 equipped with the protective tube 1 is adjusted by a brake device on the ship. While gradually going out of the ship. The cable drawn out into the sea sinks in the sea and is laid on the seabed 32 while being guided by the guide wire 30. The laying base point may be either a cable terminal box installed on the coast or a cable connection point in the sea.

  Needless to say, the present invention is not limited to the embodiment including the protective tube main body and the hook device described below.

It is a figure which shows an example of embodiment of the cable protection tube of this invention. It is a figure which shows an example of the hook apparatus provided in the outer peripheral surface of the cable protection tube of this invention. It is a figure which shows another example of the hook apparatus provided in the outer peripheral surface of the cable protection pipe | tube of this invention. It is a figure which shows another example of the hook apparatus provided in the outer peripheral surface of the cable protection pipe | tube of this invention. It is a figure which shows another example of the hook apparatus provided in the outer peripheral surface of the cable protection pipe | tube of this invention. It is a figure which shows another example of embodiment of the cable protection pipe | tube of this invention. It is a figure which shows another example of embodiment of the cable protection pipe | tube of this invention. It is a figure which shows the laying method of the submarine cable using the cable protection pipe | tube of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cable protective tube 2 Protective tube main body 3 Bolt 4 Nut 5 Hook apparatus 6 Guide wire detachment prevention member 7 Locking means 8 Housing | casing 11, 12 Connection flange part 111, 121 U-shaped notch part 13 Axis support piece 14 Long bolt Rotating shaft 15 Long bolt 16 Wing nut 17 Hinges 21 and 22 Split pipes 21a and 22a Female connecting parts 21b and 22b Male connecting parts 21c and 22c Connecting flange parts 21d and 22d Connecting flange part 23 Binding tool 30 Guide wire 31 hook member 311 linear portion 312 hook member base 32 hook member mounting base 33 hook member 34 having wire disconnection preventing portion wire disconnection preventing claw support piece 35 wire disconnection preventing claw 36 bolt 38 gear 39 rack 40 wire disconnection preventing Claw 41 Metal tape 42, 43 Metal tape fixture 45 Fixture 46, 47 Spring 50 Wire engagement 51 wire off preventing piece 52 spring 60, 61 the housing wall 62 housing (attachment to the protective tube)
90 Cable 91 Cable laying carrier 92 Seabed

Claims (8)

  A cable protection tube comprising a tube main body in which connecting portions are formed at both ends in the tube axis direction, wherein a hook device is provided on the outer peripheral surface of the tube main body so that a guide wire can be attached and detached.   The cable protection tube according to claim 1, wherein the hook device is fixed directly or indirectly to an outer peripheral surface of the tube main body.   The cable protection tube according to claim 1, wherein the hook device includes a guide wire disconnection prevention unit.   The guide wire detachment preventing portion closes the opening of the hook device while the hook device receives a load in a substantially normal direction to the outer peripheral surface of the protective tube via the guide wire, The cable protection tube according to claim 3, wherein the cable protection tube operates to open the opening after the load is removed.   The cable protection pipe according to any one of claims 1 to 4, wherein the pipe body is composed of a pair of half pipes divided into two in the pipe axis direction.   The pair of halves are provided with hinges along one side edge in the opposite tube axis direction, one of which is rotatable with respect to the other around the hinge, 6. The cable protection tube according to claim 5, further comprising locking means for fixing the half pipes in contact with each other at a side edge thereof.   The locking means is provided with an engagement piece and a wing screw which is opposed to the engagement piece and is detachably engaged with the engagement piece, and which can fix the two anti-split tubular bodies. The cable protection tube according to claim 6, wherein the cable protection tube is provided on each side edge of the pair of half pipes.   A method of laying a submarine cable using a cable laying base ship, wherein the cable protection tube according to any one of claims 1 to 6 is attached to a cable mounted on the ship so that its hook device faces in the same direction. Attach the hook device with a guide wire, one end of which is fixed to the laying base in advance. A method for laying a submarine cable, wherein the guide wire is removed and collected from a protective pipe laid on the seabed after being submerged and laid on the seabed for a predetermined distance.

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