JP2018033278A - Tubular body and tubular body connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-rigidity tubular body capable of being sufficiently immune even to a load upon a coupling portion, and a tubular body connection structure.SOLUTION: The present invention relates to a non-flexible tubular body (31) wrapping a flexible long body from an outer surface. The tubular body comprises: a cylinder part (32) in a cylindrical shape wrapping the long body; an annular flange part (33) protruding outwards in a radial direction of the cylinder part (32) and having predetermined thickness in one end of the cylinder part (32) in a direction of an axis (X); and an annular engagement part (34) which is engaged with the flange part (33) of the other tubular body (31) in the other end in the direction of the axis (X) and whose cross section in the direction of the axis (X) is U-shaped. The engagement part (34) includes a pair of sidewall parts (34a and 34b) disposed oppositely in the direction of the axis (X) while being spaced by an interval wider than the thickness of the flange part (33). The cylinder part (32) includes a rib (36) erected radially outwards from an outer surface of the cylinder part (32) and extending along the axis (X). The rib (36) has one end formed integrally with the engagement part (34).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tubular body and a tubular body connecting structure, and more particularly to a tubular body and a tubular body connecting structure that regulate the bending angle of a flexible long body.

  Conventionally, as shown in FIG. 10, when two cables C connected inside the connection box 10 are laid on the seabed, the cables C are gradually dropped from the ship into the sea together with the connection box 10. At that time, the cable C exposed to the outside from the connection box 10 is bent near the connection box 10 by its own weight. In order to avoid such a situation, the cable C is suspended by a plurality of suspension wires WR that are evenly attached to the long suspension balance SB. The suspension balance SB is lifted by a crane Cr, and the cable C is dropped into the sea together with the suspension balance SB and the connection box 10 by the crane Cr, and finally the cable C is laid on the seabed.

  In this case, although the cable C can be prevented from being bent by the suspension wire WR, a local load is applied to the binding portion BP of the cable C by the suspension wire WR, and the cable C may be damaged. was there.

  By the way, in general, there is a submarine cable protected by a predetermined tubular body, that is, a protective pipe in order to prevent damage caused by throwing fishing equipment or a boat. For example, the outer surface of a submarine cable is protected by a plurality of protective pipes connected along the pipe axis direction.

  The protective tube is formed with a female connecting portion and a male connecting portion at each end in the tube axis direction. Therefore, one protective pipe and the other protective pipe which are adjacent to each other form a protective pipe row by connecting the female connecting portion of one protective pipe and the male connecting portion of the other protective pipe. The submarine cable is covered with the protective tube row to prevent the submarine cable from being bent beyond a predetermined allowable curvature (see, for example, Patent Document 1).

JP 2008-245340 A

  By the way, when the above-described cable C is suspended, the suspension wire WR is attached only to the connection box 10 without being bound to the cable C, and the cable C is covered by the protective tube row described in Patent Document 1, and the cable C is allowed to have a predetermined tolerance. It is conceivable to prevent bending beyond the curvature.

  However, when the cable C is very long and heavy, a large load is applied to the connecting portion between the female connecting portion of one protective tube and the male connecting portion of the other protective tube, and the connecting portion may be damaged. there were.

  Then, this invention is made | formed in view of the said subject, and it aims at providing the highly rigid tubular body and tubular body connection structure which can fully endure the load with respect to a connection part.

  In order to achieve the above object, a non-flexible tubular body that covers a flexible long body from the outer surface, the tubular body portion covering the long body from the outside; An annular flange portion having a predetermined thickness projecting radially outward of the cylindrical body portion at one end in the axial direction of the cylindrical body portion, and the flange of another tubular body at the other end in the axial direction And an annular engagement portion having a U-shaped cross section in a cross section along the axial direction, the engagement portion being spaced apart by a larger distance than the thickness of the flange portion. A pair of side wall portions disposed opposite to each other along the axial direction, wherein the cylindrical body portion is erected outward from the radial direction from an outer surface of the cylindrical body portion and extends along the axial line; One end of the rib is formed integrally with the engaging portion.

  Moreover, it is preferable that the said cylindrical part has the bulging part which swelled in the circular arc shape inward of the said radial direction in the inner surface in the cross section along the said axial direction.

  Moreover, it is preferable that the said cylinder part consists of two half members which divided | segmented the said cylinder part in half along the said axial direction.

  Further, the half member includes a plate-like connecting portion erected radially outward from the outer surface of the half member in order to connect the two half members in contact with each other. It is preferable that the connecting portions of the two halved members are integrally connected by a predetermined fixture in a state where the connecting portions are in contact with each other.

  Moreover, it is preferable that the said rib is provided between the said connection part and the said connection part in the outer surface of the said cylindrical body.

  Moreover, it is preferable that the said connection part is integrally formed with the said engaging part at one end.

  Furthermore, in order to achieve the above object, a tubular body connecting structure in which a plurality of non-flexible tubular bodies covering a flexible long body from the outer surface are connected in series, A cylindrical tubular portion that covers the body from the outside, and an annular flange portion having a predetermined thickness protruding outward in the radial direction of the tubular portion at one end in the axial direction of the tubular portion; Engaging with the flange portion of the other tubular body at the other end in the axial direction, and an annular engaging portion having a U-shaped cross section in a cross section along the axial direction. A flange portion having a pair of side wall portions opposed to each other along the axial direction with an interval wider than the thickness of the flange portion, and the cylindrical body portion is formed on the outer side in the radial direction from the outer surface of the cylindrical body portion. And a rib extending along the axis, the rib having one end connected to the flange portion. Characterized in that it is formed in the body.

  ADVANTAGE OF THE INVENTION According to this invention, the highly rigid tubular body which can fully endure the load with respect to a connection part, and a tubular body connection structure are realizable.

It is a figure which shows roughly the tubular body connection structure which concerns on this Embodiment. It is a figure for demonstrating the structure of a tubular body. It is sectional drawing for demonstrating the structure of the tubular body connection structure which connected the tubular body. It is a figure which shows three tubular body connection structures which have a mutually different largest bending angle. FIG. 5 is a diagram showing two tubular bodies extracted in a cross-section in the tubular body connecting structures shown in FIG. It is a figure for demonstrating the bulging part of a tubular body. It is a figure which shows the process of landing a cable on the seabed. It is a figure for demonstrating the connection state of two tubular bodies in the different location of the tubular body connection structure in the suspended state. It is a figure which shows the tubular body to which the suspending member was attached. It is a figure for demonstrating the conventional method of dropping a cable in water.

<Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and various forms can be taken within the scope of the present invention.

  FIG. 1 is a diagram schematically showing a tubular body connection structure according to the present embodiment. FIG. 2 is a view for explaining the configuration of the tubular body of the tubular body connection structure. Fig.3 (a) is a longitudinal cross-sectional view of a tubular body connection structure, FIG.3 (b) is a longitudinal cross-sectional view of the tubular body connection structure in a different position from Fig.3 (a). FIG. 4 is a diagram showing three tubular body connecting structures having different maximum bending angles. FIG. 5A to FIG. 5C are cross-sectional views showing two tubular bodies that form the maximum bending angle in each tubular body connecting structure shown in FIG. FIG. 6A and FIG. 6B are diagrams for explaining the bulging portion of the tubular body.

<Tubular connection structure>
As shown in FIG. 1, the tubular body connection structure 1 hangs a cable C laid on the bottom B of a sea, lake, river, or the like by a winch W (see FIG. 7) mounted on the ship S. In order to restrict the cable C from being bent more than a predetermined allowable curvature in the vicinity of the junction box 10, the cable C is covered.

  One tubular body connection structure 1 (left side in FIG. 1) is mechanically connected to the connection box 10, and the other tubular body connection structure 1 (right side in FIG. 1) is also connected to the connection box 10 and the machine. Connected.

  Here, the connection box 10 is a cylindrical member that connects the two cables C and C, and is also called a so-called joint box. The connection box 10 is connected to a winch W on a cylindrical main body 11 that connects two cables C and C in series on the inner side thereof, and an outer peripheral surface in the vicinity of both side ends in the longitudinal direction of the main body 11. And an attachment portion 12 for attaching the suspension wire WR.

  In addition, the connection box 10 includes an adapter 13 that protrudes along the longitudinal direction from both end portions in the longitudinal direction of the main body 11. The adapter 13 is for mechanically connecting the tubular body connection structure 1 to the connection box 10 and straightens the cable C outward from the main body 11 of the connection box 10 along the longitudinal direction. It guides you to derive.

  The tubular body connection structure 1 is formed by connecting a plurality of tubular bodies 31 in series along the axial direction, and covers the outer peripheral surface of the cable C. The cable C covered by one tubular body connection structure 1 and the cable C covered by the other tubular body connection structure 1 are electrically connected to each other inside the connection box 10.

  Here, the cable C connects between a predetermined ground facility provided on land and a floating facility that floats on the water, for example, a wind power generation facility. A long body having flexibility. As the long body, in addition to the cable C, for example, a fluid transport pipe such as a seabed water supply pipe, a seabed oil supply pipe, or a seawater intake pipe may be used as the long body.

<Tubular body>
The tubular body 31 is connected to each other along the axial direction thereof, and is a non-flexible element forming the tubular body connection structure 1. The tubular body 31 is not limited to a material as long as it is a non-flexible rigid body. For example, a metal material such as iron, steel, stainless steel, aluminum, or an aluminum alloy, or plastic, hard plastic, glass fiber, or carbon fiber. It is formed of a resin material such as fiber reinforced plastic reinforced with fibers such as. In the case of the metallic tubular body 31, it is preferable that the anticorrosion treatment is performed, for example, by coating a resin or the like. As a manufacturing method of the tubular body 31, for example, the metallic tubular body 31 is manufactured by casting, and the resin tubular body 31 is manufactured by an injection molding method. In view of the strength of the tubular body 31 and the manufacturing cost, the tubular body 31 is particularly preferably made of cast iron.

  The tubular body 31 has a configuration that surrounds and covers the cable C from the outside, allows relative movement and angular variation of the tubular bodies 31 connected to each other, and restricts the movable range of the tubular bodies 31. doing. That is, the tubular body connecting structure 1 formed by connecting a plurality of the tubular bodies 31 along the axis X direction can regulate the bending of the cable C within the allowable curvature range.

  As shown in FIGS. 2, 3 (a), and 3 (b), the tubular body 31 includes a tubular body portion 32, a flange portion 33, and an engaging portion 34. The cylindrical part 32 has a hollow cylindrical shape, and is a part that mainly covers the cable C from the outside. The flange portion 33 is an annular portion that protrudes in a direction perpendicular to the axis X at one end of the cylindrical portion 32 in the axis X direction. The engaging portion 34 is a portion that protrudes in a direction perpendicular to the axis X at the other end in the axis X direction of the cylindrical body portion 32 and has a substantially U-shaped cross section along the axis X direction. The tubular body 31 is formed by combining two halved members 31a and 31b divided in half along the axis X direction.

  As shown in FIG. 3A, the cylindrical portion 32 includes a cylindrical main body portion 32a and a substantially cylindrical curved portion 32b integrally formed at one end of the main body portion 32a. The main body portion 32a is not limited to a cylindrical shape, and may have a rectangular tube shape.

  The main body portion 32a is a cylindrical portion, and a bulging portion 32c that bulges radially inward in a cross section along the axis X direction on the inner circumferential surface thereof and can come into surface contact with the outer circumferential surface of the cable C. have. The bulging portion 32c is formed in an annular shape over the circumferential direction of the inner peripheral surface of the main body portion 32a. Details of the bulging portion 32c will be described later.

  The curved portion 32b is a portion that swells radially outward from the outer peripheral surface of the main body portion 32a at one end of the main body portion 32a. The curved portion 32b has a spherical inner peripheral surface 32bs whose diameter is larger than that of the main body portion 32a.

  Moreover, the cylinder part 32 further has the connection board 35 used in order to connect half member 31a, 31b, as shown to FIG. 2 and FIG. 3 (a). The connecting plate 35 is a plate-like portion formed in a rectangular shape in plan view, and is provided at both end edges in the circumferential direction of the half members 31a and 31a of the openings along the axis X direction of the half members 31a and 31b. The halved members 31a and 31b are integrally formed so as to stand radially outward from the outer peripheral surface. The connecting plate 35 is formed integrally with a side wall portion 34a of the engaging portion 34 described later.

  The connecting plate 35 has two insertion holes 35a through which the bolts B (see FIG. 2) are inserted. The bolt B is inserted into the insertion hole 35a and fastened by the nut N in a state where the connecting plates 35 of the two half members 31a and 31b are in contact with each other and overlapped. At that time, the cable C is in a state of being covered with a tubular body 31 in which the two half members 31a and 31b are combined.

  As shown in FIGS. 2 and 3B, the cylindrical body portion 32 has ribs 36 erected from the outer peripheral surface thereof outward in the radial direction. The rib 36 is formed at a position perpendicular to the direction of the axis X and separated from any of the connecting plates 35, 35 by the same distance. The rib 36 is formed integrally with the side wall portion 34 a of the engaging portion 34, and is formed in a triangular shape such that the protruding amount gradually decreases toward the flange portion 33.

[Flange part]
As shown in FIGS. 3A and 3B, the flange portion 33 has a curved portion 32 b of the tubular body 31 when the two half members 31 a and 31 b are connected to each other to form the tubular body 31. This is a portion formed on the outer peripheral surface, and is formed at the open end 32d of the curved portion 32b. The flange portion 33 has an outer peripheral side end surface 33a rounded at the outer end portion in the radial direction.

[Engagement part]
As shown in FIGS. 3 (a) and 3 (b), the engaging portion 34 is formed when the two half members 31a and 31b are connected to each other to form the tubular body 31 into a tubular shape. It is a site | part formed in the outer peripheral surface of this edge part, and is cyclically | annularly formed along the opening end 32e of the cylinder part 32. As shown in FIG. That is, the engaging portion 34 is formed in an annular shape around the axis X on the outer peripheral surface of the cylindrical portion 32, for example.

  The engaging portion 34 has a U-shaped cross section in a cross section along the axis X direction, and has two side wall portions 34a and 34b facing each other and an outer peripheral wall portion 34c that connects the side wall portions 34a and 34b. Specifically, the engaging portion 34 includes a side wall portion 34a extending radially outward from the outer peripheral surface of the main body portion 32a, and a side wall portion 34b facing the side wall portion 34a at a predetermined interval in the axis X direction. And an outer peripheral wall portion 34c that connects the two side wall portions 34a and 34b.

  Here, the engagement part 34 having a U-shaped cross section includes, for example, a side wall part 34a, a side wall part 34b, and a side wall part 34b facing each other in the cross section along the X-axis direction shown in FIG. The locus of the line following the outer peripheral wall portion 34c is a portion formed in a U shape. Further, the cross-sectional shape of the engaging portion 34 along the axis X is not limited to a strict U-shape, and may be a portion formed in a substantially U-shape by a curve such as a horseshoe shape.

  The side wall part 34b is formed shorter than the side wall part 34a in the cross section along the axis X direction, and has an opening 34h formed in the side wall part 34b. The inner diameter of the opening 34 h is larger than the innermost diameter of the bulging portion 32 c of the cylindrical body portion 32.

  Incidentally, the engaging portion 34 has a U-shaped cross section formed by the side wall portion 34b shorter than the side wall portion 34a in the cross section along the axis X direction. 34b may be formed longer or the side walls 34a and 34b may be formed with the same length.

  In addition, the inner diameter of the opening 34 h is larger than the outer diameter of the cylindrical portion 32, but smaller than the outer diameter of the flange portion 33. Thereby, after the flange part 33 and the side wall part 34b of the engaging part 34 are engaged, the engagement state is prevented from being canceled. When the flange portion 33 is engaged with the engaging portion 34, a constant clearance (gap) Cl is formed between the side wall portion 34b and the outer peripheral surface of the curved portion 32b of the cylindrical body portion 32 in the opening 34h. Has been.

  The side wall part 34a has an inner surface (hereinafter also referred to as “inner side surface”) 34as, the side wall part 34b has an inner side surface 34bs, and the outer peripheral wall part 34c has an inner side surface 34cs. . The inner side surface 34cs is formed as a gentle arcuate surface. The inner diameter defined by the inner side surface 34cs of the outer peripheral wall portion 34c is the same as the outer diameter of the flange portion 33, but the outer peripheral side end surface 33a of the flange portion 33 slides smoothly with respect to the inner side surface 34cs of the outer peripheral wall portion 34c. It is possible to move.

  A distance D between the inner side surface 34as of the side wall portion 34a and the inner side surface 34bs of the side wall portion 34b is an interval at which the flange portion 33 can move along the axis X direction with respect to the engaging portion 34. That is, the distance D is set wider than the thickness of the flange portion 33 along the axis X direction. Therefore, the outer peripheral side end surface 33a of the flange portion 33 is always in sliding contact with the inner side surface 34cs of the outer peripheral wall portion 34c of the other tubular body 31, and is in contact with the inner side surface 34as of the side wall portion 34a or the inner side surface 34bs of the side wall portion 34b. It has a structure that can be contacted. Thus, the relative angle between one tubular body 31 and the other tubular body 31 changes according to the distance D between the inner side surface 34as of the side wall portion 34a and the inner side surface 34bs of the side wall portion 34b.

  For example, FIG. 4 is a diagram showing that three different maximum bending angles θ1 to θ3 by the tubular body connection structure 1 can be defined. For example, the tubular body connection structure 1 shown in FIG. 5A has a maximum radius of curvature Ra corresponding to the maximum bending angle θ1 between the tubular bodies 31, and the tubular body connection structure 1 shown in FIG. Has a maximum radius of curvature Rb corresponding to the maximum bending angle θ2 between the tubular bodies 31, and the tubular body connection structure 1 shown in FIG. 5C has a maximum corresponding to the maximum bending angle θ3 between the tubular bodies 31. It has a radius of curvature Rc. Hereinafter, the maximum curvature radii Ra, Rb, and Rc may be referred to as the maximum curvature radii R.

  Here, the “maximum bending angle” is the maximum angle difference between the axis X of one tubular body 31 and the axis X of the other adjacent tubular body 31, that is, one tubular body 31 and the other tubular body 31. Relative angle when maximally displaced between and.

  In the tubular body connection structure 1, as shown in FIGS. 5A to 5C, the outer peripheral side end surface 33 a of the flange portion 33 of one tubular body 31 is the outer peripheral wall portion 34 c of the other tubular body 31. The maximum bending angles θ1 to θ3 are obtained when they are in sliding contact with the inner side surface 34cs of the first side wall, abut against the inner side surface 34bs of the side wall portion 34b, and simultaneously abut against the inner side surface 34as of the side wall portion 34a.

  The maximum bending angles θ1 to θ3 formed by the tubular body connecting structure 1 are the distances D1, D2, between the inner side surface 34as of the side wall portion 34a and the inner side surface 34bs of the side wall portion 34b in the engaging portion 34 of the tubular body 31. Varies according to D3.

  Here, the bulging part 32c in the main-body part 32a of the cylindrical part 32 shown to Fig.6 (a), (b) is demonstrated. The bulging portion 32c gradually increases in bulging amount from one end on the flange portion 33 side of the main body portion 32a toward the center along the axis X direction of the cylindrical body portion 32, and the engaging portion of the main body portion 32a from the center It is formed in an arc shape so that the bulging amount gradually decreases toward the other end on the 34 side. That is, the inner diameter of the main body portion 32a is reduced from the end of the main body portion 32a toward the center along the axis X direction, and the inner diameter is the smallest at the center of the main body portion 32a.

  As shown in part in FIG. 6 (a), when a plurality of tubular bodies 31 are connected in an annular shape in a state where the maximum bending angle is formed, the inner peripheral surfaces 32bs of the curved portions 32b of the tubular bodies 31 adjacent to each other. A center point P1 of the virtual circle VC1 and a center point P2 of the virtual circle VC2 on the inner side surface 34cs of the engaging portion 34 of the adjacent tubular bodies 31 exist.

  Here, the center point P1 of the virtual circle VC1 of the curved portion 32b in the central tubular body 31 coincides with the center point P2 of the virtual circle VC2 of the engaging portion 34 in the left tubular body 31. Further, the center point P2 of the virtual circle VC2 of the engaging portion 34 in the central tubular body 31 and the center point P1 of the virtual circle VC1 of the curved portion 32b in the right tubular body 31 coincide with each other. A virtual circle VC3 having a maximum radius of curvature R is formed through the plurality of center points P1 (P2), center points P2 (P1),.

  Further, as shown in FIG. 6B, the bulging portion 32c is formed to bulge into an arc shape so as to substantially match the curvature of the virtual circle VC3 having the maximum radius of curvature R. The virtual circle VC4 and the virtual circle VC3 formed by the arc shape of the bulging portion 32c are concentric circles having the same center point. Note that the virtual circle VC3 and the virtual circle VC4 have a curvature and a radius of curvature that are approximate to each other.

<Hanging method>
Subsequently, a process of laying the cable C covered with the tubular body connection structure 1 on the water bottom B will be described with reference to FIGS. 7 (a) and 7 (b). As shown in FIG. 7A, the two cables C and C are connected by the connection box 10, and the half members 31a and 31b of the tubular body 31 are combined to cover the cable C and adjacent to each other. After the tubular bodies 31 to be connected are sequentially connected to each other by the flange portion 33 and the engaging portion 34 to form the tubular body connecting structure 1, the tubular body 31 is suspended from the ship S by the winch W through the suspension wire WR.

  As shown in FIG. 7B, the cable C covered with the tubular body connection structure 1 is gradually dropped into the water H in a state where the cable C is suspended by the winch W of the ship S through the suspension wire WR. It will be rare. At that time, a part of the cable C that is not covered by the tubular body connection structure 1 and is exposed from the tubular body connection structure 1 in the water H first reaches the bottom B, and moves in the direction of the arrow of the ship S. As the process proceeds, the tubular body connection structure 1 is gradually grounded. Incidentally, the cable C and the tubular body connecting structure 1 are separated from the winch W after landing on the water bottom B together with the suspension wire WR.

  Here, since the cable C is covered with the tubular body connection structure 1, the cable C is prevented from being bent beyond the allowable curvature due to its own weight in the vicinity of the connection box 10.

<Effect>
Next, the effect of restricting the bending of the cable C by the tubular body connection structure 1 will be described. FIG. 8A shows a state in which no bending occurs between the one tubular body 31 and the other tubular body 31, and the cable C is linearly covered. It is a figure which shows one tubular body 31 and the other tubular body 31. FIG. 8B is a view showing a bent state in which one tubular body 31 is inclined more greatly than the other tubular body 31 due to the weight of the cable C in the vicinity of the junction box 10.

  As shown in FIG. 8A, when the two tubular bodies 31 are connected in a straight line, the outer peripheral side end surface 33 a of the flange portion 33 of one tubular body 31 is formed on the outer peripheral wall portion 34 c of the engaging portion 34. It is simultaneously in contact with both the inner side surface 34cs and the inner side surface 34bs of the side wall 34b.

  As shown in FIG. 8B, when the maximum bending angle θ is formed when one tubular body 31 is largely inclined toward the bottom B with respect to the other tubular body 31 due to the weight of the cable C, The outer peripheral side end surface 33a of the flange portion 33 of the tubular body 31 contacts the inner side surface 34cs of the outer peripheral wall portion 34c, contacts the inner side surface 34bs of the side wall portion 34b on the water surface side, and the side wall portion 34a on the water bottom B side. Is in contact with the inner side surface 34as.

  In this case, one tubular body 31 is in a state of rotating with the flange portion 33 of the other tubular body 31 in contact with the side wall portion 34b as a fulcrum. In this state, one tubular body 31 does not rotate further toward the bottom B with respect to the other tubular body 31. Therefore, it is possible to prevent the cable C from being bent beyond the allowable curvature.

  Furthermore, since the outer peripheral surface of the cable C covered inside the tubular body connection structure 1 is in surface contact with the bulging portion 32c of the tubular body 31, local contact between the tubular body 31 and the cable C is avoided. can do. Thereby, it is possible to prevent the cable C from being damaged early.

  Further, since the tubular body 31 constituting the tubular body connection structure 1 is connected with the clearance Cl by the annular flange portion 33 and the annular engagement portion 34, the entire movable range of the tubular body 31 is provided. It will extend to the circumference (360 °).

  Moreover, since the connection plate 35 and the rib 36 are integrally formed in the outer peripheral surface of the side wall part 34a of the engaging part 34, the tubular body 31 is applied to the connection part of the adjacent tubular bodies 31, especially the engaging part 34. A high rigidity that can sufficiently withstand a load can be obtained, and thus the cable C can be stably covered for a long period of time.

<Other embodiments>
The tubular body connecting structure 1 is not only formed of the same tubular body, but also has a side wall portion 34a in the engaging portion 34 of the tubular body 31 as shown in FIGS. 5 (a) to 5 (c). You may comprise combining the tubular body from which the distance D of inner surface 34as of this and inner surface 34bs of the side wall part 34b differs.

  In the above embodiment, the cable C is suspended by the winch W via the suspension wire WR in the connection box 10, but via the metal suspension member 40 attached to the connecting plate 35 of the tubular body 31. You may also hang it. FIG. 9 is a view showing a tubular body to which a suspension member is attached, FIG. 9A is a side view of the tubular body, and FIG. 9B is a cross-sectional view taken along line II of FIG. 9A. It is sectional drawing of the tubular body along a line.

  As shown in FIG. 9A, the suspension member 40 is attached to a connecting plate 35 of at least one tubular body 31 constituting the tubular body connection structure 1. As shown in FIG. 9B, the suspension member 40 includes a pair of connection plates 41 and 41 connected to the tubular body 31 and an engagement plate 42 to which the suspension wire WR is attached.

  The connecting plate 41 has an insertion hole 41a through which the bolt B is inserted, and an insertion hole 41b through which the bolt B1 is inserted. The engagement plate 42 has an insertion hole 42a through which the bolt B1 is inserted, and an engagement hole 42b to which the suspension wire WR is attached.

  When such a suspension member 40 is connected to at least one tubular body 31 of the tubular body connection structure 1 and the cable C is suspended by the suspension wire WR via the suspension member 40, the flange portion is caused by the weight of the cable C. It is possible to reduce the load on the connecting portion of 33 and the engaging portion 34.

<Others>
In addition, although embodiment which uses the tubular body connection structure 1 when suspending two cables C and C connected via the connection box 10 was described, said tubular body connection structure 1 is described above. For example, it is possible to cover a cable that hangs between the offshore facility and the seabed B, and to prevent the cable from bending beyond an allowable curvature.

DESCRIPTION OF SYMBOLS 1 Tubular body connection structure 31 Tubular body 31a, 31b Half member 32 Cylindrical part 32a Main body part 32b Curved part 32c Bumping part 33 Flange part 34 Engagement part 34a, 34b Side wall part 34c Outer peripheral wall part 35 Connection board (connection) Part)
36 Rib 40 Suspension member B Bolt N Nut C Cable (Long body)
X axis

Claims (7)

A non-flexible tubular body covering the flexible elongated body from the outer surface,
A cylindrical tube portion covering the elongated body from the outside;
An annular flange portion having a predetermined thickness protruding outward in the radial direction of the cylindrical portion at one end in the axial direction of the cylindrical portion;
Engaging with the flange portion of another tubular body at the other end in the axial direction, and an annular engaging portion having a U-shaped cross section in a cross section along the axial direction;
With
The engaging portion has a pair of side wall portions disposed to face each other along the axial direction in a state of being spaced apart from the thickness of the flange portion.
The cylindrical body portion has a rib that is erected from the outer surface of the cylindrical body portion outward in the radial direction and extends along the axis.
One end of the rib is formed integrally with the engaging portion. 2. The tubular body according to claim 1, wherein the tubular body portion has a bulging portion swelled in an arc shape inward in the radial direction in a cross section along the axial direction on an inner surface thereof. The tubular body according to claim 1 or 2, wherein the tubular body portion includes two halved members obtained by dividing the tubular body portion in half along the axial direction. The half member is
In order to connect the two halved members in contact with each other, a plate-like connecting portion erected radially outward from the outer surface of the half member,
The tubular body according to claim 3, wherein the connecting portions of the two halved members are integrally connected by a predetermined fixture in a state where the connecting portions are in contact with each other. The said rib is provided between the said connection part and the said connection part in the outer surface of the said cylinder part. The tubular body of Claim 4 characterized by the above-mentioned.   The tubular body according to claim 4 or 5, wherein one end of the connecting portion is formed integrally with the engaging portion. A tubular body connecting structure in which a plurality of inflexible tubular bodies covering a flexible long body from the outer surface are connected in series,
A cylindrical tube portion covering the elongated body from the outside;
An annular flange portion having a predetermined thickness protruding outward in the radial direction of the cylindrical portion at one end in the axial direction of the cylindrical portion;
Engaging with the flange portion of another tubular body at the other end in the axial direction, and an annular engaging portion having a U-shaped cross section in a cross section along the axial direction;
With
The engaging portion has a pair of side wall portions disposed to face each other along the axial direction in a state of being spaced apart from the thickness of the flange portion.
The cylindrical body portion has a rib that is erected from the outer surface of the cylindrical body portion outward in the radial direction and extends along the axis.
One end of the rib is formed integrally with the engaging portion.

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