Submarine cable burial depth protection pipeline and directional drilling tail end pipeline

Abstract

The invention discloses a submarine cable burial depth protection pipeline and a directional drilling tail end pipeline, the submarine cable burial depth protection pipeline comprises a Haff type outer hard pipe with a flange at one end and a lining hose with a flange at one end, and the lining hose is coaxially installed in the Haff type outer hard pipe in a penetrating mode. The flange of the lining hose is located on the outer side and abuts against the flange of the Haff type outer hard pipe. The device can prevent the submarine cable from forming a suspended section at the outlet of the lining hose, improves the protection of the submarine cable, improves the construction quality of the submarine cable at the outlet of the lining hose, and prolongs the service life of the submarine cable.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering technology, and in particular to a submarine cable buried depth protection pipeline and a directional drilling terminal pipeline. Background Art

[0002] The submarine cable needs to be buried in the seabed. During the construction of the submarine cable crossing the directional drilling terminal pipeline, the terminal pipeline is a hard pipe, which can pass through the seabed at a certain inclination angle and extend above the seabed mud surface, so as to realize the pipeline construction of the submarine cable. Then, the submarine cable located above the seabed mud surface and extending from the terminal pipeline is bent and laid horizontally on the seabed mud surface. Finally, the submarine cable extending above the seabed mud surface is usually covered with cement mortar bags and buried, such as Figure 1 The disadvantage is that the submarine cable extending out of the seabed mud surface cannot be attached to the seabed mud surface at the outlet of the terminal pipeline, resulting in a suspended section, which leads to a shallow burial depth of the suspended section. The submarine cable at the suspended section will be exposed in advance due to the influence of tidal scouring. The submarine cable in the suspended section is easily damaged by repeated bending at the outlet of the terminal pipeline due to the influence of tidal force, resulting in poor burial quality of the submarine cable. Summary of the invention

[0003] The purpose of the present invention is to provide a submarine cable buried depth protection pipeline and a directional drilling terminal pipeline to solve the problem that the submarine cable at the outlet of the directional drilling terminal pipeline has a suspended section that affects the construction quality and service life of the submarine cable.

[0004] In order to solve the above technical problems, the present invention provides a submarine cable buried deep protection pipeline, including a Hough type outer rigid pipe with a flange at one end and an inner lining hose with a flange at one end, the inner lining hose is coaxially inserted and installed in the Hough type outer rigid pipe, and the flange of the inner lining hose is located on the outside and abuts against the flange of the Hough type outer rigid pipe.

[0005] Furthermore, the submarine cable buried protection pipeline provided by the present invention, the Hough-type external rigid pipe includes two semicircular pipe segments, assembly plates horizontally arranged on both sides of the arc-shaped end of each semicircular pipe segment along the length direction, and a plurality of bolts passing through the assembly plates connected on both sides of the two semicircular pipe segments.

[0006] Furthermore, in the submarine cable buried protection pipe provided by the present invention, the length of the assembly plate is less than the length of the semicircular pipe segment, and the end surface of the assembly plate is arranged without contact with the flange.

[0007] Furthermore, in the submarine cable buried depth protection pipe provided by the present invention, the lining hose is a pipe body with a variable cross-section from large to small from the flange end to the other end.

[0008] Furthermore, in the submarine cable buried depth protection pipeline provided by the present invention, the lining hose is a rubber tube.

[0009] In order to solve the above technical problems, the present invention also provides a directional drilling terminal pipeline, including the above-mentioned submarine cable buried depth protection pipeline and a section of directional drilling pipeline with a flange at one end, wherein the directional drilling pipeline and the submarine cable buried depth protection pipeline are connected through three flanges with multiple radially distributed bolts.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The submarine cable buried depth protection pipeline and the directional drilling terminal pipeline provided by the present invention, in the construction process of underwater directional drilling pipeline towing back, the directional drilling pipeline of the directional drilling terminal pipeline is completely buried below the seabed mud surface, the buried depth protection pipe of the directional drilling terminal pipeline is partially buried below the seabed mud surface and partially extends above the seabed mud surface, after the submarine cable is inserted into the directional drilling terminal pipeline, the half-type outer hard pipe of the submarine cable buried depth protection pipeline is removed, and the connection of the lining hose is retained, and the lining hose located on the seabed mud surface is bent and laid flat on the seabed mud surface along with the submarine cable, thereby avoiding the formation of a suspended section of the submarine cable at the outlet of the lining hose, and after the submarine cable is covered and buried by the cement mortar bag, the cement mortar between the suspended section and the seabed mud surface will not be washed away and lost due to the scouring of the seawater tide, resulting in the problem of hollowing out and exposing the suspended section of the submarine cable again and causing damage, thereby effectively protecting the submarine cable at the outlet of the directional drilling terminal pipeline, and improving the construction quality and service life of the submarine cable at the outlet of the directional drilling terminal pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the conventional directional drilling terminal pipeline and the submarine cable at its outlet with a suspended section;

[0013] Figure 2 It is a schematic diagram of the three-dimensional combined structure of the submarine cable buried deep protection pipeline of the present invention;

[0014] Figure 3 It is a schematic diagram of the three-dimensional explosion structure of the submarine cable buried deep protection pipeline of the present invention;

[0015] Figure 4 It is a schematic diagram of the three-dimensional structure of the directional drilling terminal pipeline of the present invention;

[0016] Figure 5 It is a schematic diagram of the structure in which the terminal pipe of the directional drilling of the present invention extends out of the mud surface of the seabed;

[0017] Figure 6 It is a schematic structural diagram of a directional drilling end pipeline of the present invention with no hanging section at the outlet after the Hough type outer hard pipe is removed;

[0018] As shown in the figure:

[0019] 1. Submarine cable buried depth protection pipeline, 2. Haff type external hard pipe, 3. Semicircular pipe segment, 4. Lined hose, 5. Flange, 6. Assembly plate, 7. Bolts, 8. Directional drilling pipeline, 9. Submarine cable, 10. Seabed mud surface. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the accompanying drawings: The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0021] Embodiment 1

[0022] Please refer to Figure 2 and Figure 3 Embodiment 1 of the present invention provides a submarine cable buried deep protection pipeline 1, comprising a Hough type outer rigid pipe 2 with a flange 5 at one end and an inner lining hose 4 with a flange 5 at one end, wherein the inner lining hose 4 is coaxially inserted into and installed in the Hough type outer rigid pipe 2, and the flange 5 of the inner lining hose 4 is located on the outside and abuts against the flange 5 of the Hough type outer rigid pipe 2.

[0023] Please refer to Figure 5 and Figure 6 In the submarine cable buried protection pipeline 1 provided in the first embodiment of the present invention, the Hough type outer hard pipe 2 has a certain strength, and when in use, it can be passed through the seabed mud surface 10, so as to facilitate the installation of the submarine cable 9; when the Hough type outer hard pipe 2 is removed, the lining hose 4 can be bent and laid on the seabed mud surface along with the submarine cable 9, so as to avoid the submarine cable 9 having a suspended section at the outlet of the lining hose 4. In order to facilitate bending, the lining hose 4 can be a rubber hose.

[0024] Please refer to Figure 3 and Figure 4 In order to remove the Hough type outer rigid tube 2, the submarine cable buried depth protection pipeline 1 provided in the first embodiment of the present invention comprises two semicircular tube segments 3, assembly plates 6 horizontally arranged on both sides of the arc-shaped end of each semicircular tube segment 3 along the length direction, and a plurality of bolts 7 penetrating and connecting the assembly plates 6 on both sides of the two semicircular tube segments 3. The two semicircular tube segments 3 are assembled into a pipe body through the assembly plates 6, and the flange 5 on the Hough type outer rigid tube 2 facilitates the removal and separation of the connected pipes, and then the assembly and removal of the Hough type outer rigid tube 2 are realized by disassembling or installing the bolts 7.

[0025] Please refer to Figures 2 to 4In order to improve the reliability and convenience of the connection at the flange, in the submarine cable buried protection pipeline 1 provided in the first embodiment of the present invention, the length of the assembly plate 6 is less than the length of the semicircular pipe segment 3, and the end surface of the assembly plate 6 is arranged without contacting the flange 5. The assembly plate 6 that does not contact the flange 5 provides sufficient operating space for the bolts 7 at the flange 5.

[0026] Please refer to Figure 3 and Figure 6 In order to improve the fit between the lining hose 4 and the submarine cable 3 and reduce the difficulty of blocking, the submarine cable buried depth protection pipeline 1 provided in the first embodiment of the present invention has a lining hose 4 with a variable cross-section from large to small from the flange 5 end to the other end.

[0027] Embodiment 2

[0028] Please refer to Figure 4 Embodiment 2 of the present invention provides a directional drilling terminal pipeline, comprising the submarine cable buried depth protection pipeline 1 of the above-mentioned embodiment 1 and a section of directional drilling pipeline 8 with a flange 5 at one end, wherein the directional drilling pipeline 8 is connected to the submarine cable buried depth protection pipeline 1 by a plurality of radially distributed bolts 7 penetrating three flanges 5.

[0029] Please refer to Figures 2 to 6 The submarine cable buried depth protection pipeline 1 and the directional drilling terminal pipeline provided by the above embodiment of the present invention, during the construction process of pulling back the underwater directional drilling pipeline 8, the directional drilling pipeline 8 of the directional drilling terminal pipeline is completely buried below the seabed mud surface 10, and the buried depth protection pipe of the directional drilling terminal pipeline is partially buried below the seabed mud surface 10 and partially extended above the seabed mud surface 10. After the submarine cable 9 is passed through the directional drilling terminal pipeline, the Hough type outer hard pipe 2 of the submarine cable buried depth protection pipeline 1 is removed, and the connection of the lining hose 4 is retained. The lining hose 4 located on the seabed mud surface 10 is connected with the lining hose 4. The submarine cable 9 is bent and lies horizontally on the seabed mud surface 10, so that the submarine cable 9 is prevented from forming a suspended section at the outlet of the lining hose 4. After the submarine cable 9 is covered and buried by means of burying means such as cement mortar bags, the cement mortar between the suspended section and the seabed mud surface 10 will not be washed away by the scouring of seawater tides, resulting in hollowing out, so that the suspended section of the submarine cable 9 is exposed again and damaged, thereby effectively protecting the submarine cable 9 at the outlet of the directional drilling terminal pipeline, and improving the construction quality and service life of the submarine cable 9 at the outlet of the directional drilling terminal pipeline.

[0030] The present invention is not limited to the above-mentioned specific implementation modes. Obviously, the above-mentioned embodiments are only some embodiments of the embodiments of the present invention, but not all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A submarine cable buried deep protection pipeline, characterized in that: It comprises a half-type outer rigid tube with a flange at one end and an inner lining hose with a flange at one end. The inner lining hose is coaxially inserted into the half-type outer rigid tube and installed. The flange of the inner lining hose is located on the outside and abuts against the flange of the half-type outer rigid tube.

2. The submarine cable buried depth protection pipeline according to claim 1 is characterized in that: The Hough type external rigid tube comprises two semicircular segments, assembly plates horizontally arranged along the length direction on both sides of the arc-shaped end of each semicircular segment, and a plurality of bolts penetrating and connecting the assembly plates on both sides of the two semicircular segments.

3. The submarine cable buried depth protection pipeline according to claim 2 is characterized in that: The length of the assembly plate is less than the length of the semicircular tube segment, and the end surface of the assembly plate is arranged without contact with the flange.

4. The submarine cable buried depth protection pipeline according to claim 1 is characterized in that: The inner lining hose is a pipe body with a variable cross section from a large end to a small end.

5. The submarine cable buried depth protection pipeline according to claim 1 is characterized in that: The lining hose is a rubber hose.

6. A directional drilling terminal pipe, characterized in that: It comprises the submarine cable buried depth protection pipe according to any one of claims 1 to 5 and a section of directional drilling pipe with a flange at one end, wherein the directional drilling pipe and the submarine cable buried depth protection pipe are connected through three flanges with multiple radially distributed bolts.

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