CN112061323A - Special ship for laying construction of landing section submarine cable under small tidal range and construction method - Google Patents

Abstract

The invention relates to the technical field of submarine cable laying, and discloses a special ship for laying construction of a landing section submarine cable under a small tidal range condition, which comprises a ship body structure and deck equipment, and is characterized in that the ship body structure comprises two floating body structures with basically the same shape and size and a connecting structure for connecting the two floating body structures into a whole; a water pump connected by a lifting device is hung on the portal frame spanned between the two floating body structures; meanwhile, a construction method characterized by installing a cast iron sleeve and burying a submarine cable is disclosed. The invention provides a solution for laying protection construction of landing submarine cables under a small tidal range.

Description

Special ship for laying construction of landing section submarine cable under small tidal range and construction method

Technical Field

The invention relates to a submarine cable laying technology, in particular to a special construction ship for burying a submarine cable at a landing section under a small tidal range condition and a construction method.

Background

The method for dragging and constructing the landing submarine cable under the condition of small tidal range, which is filed simultaneously with the application document, solves the dragging and constructing problem of the landing submarine cable. Landing sea cables pulled into place typically need to be protected by being buried to a predetermined depth. Under the condition of small tidal range, the beach exposure time of the submarine cable embedding construction area is short or the beach exposure is not caused. Facilities such as an excavator from the land cannot enter most of the submarine cable burying areas, and the submarine cable burying work cannot be performed efficiently. The construction ship from the sea cannot enter the region for construction due to large draught.

Therefore, the development of a special ship for submarine cable burying construction at landing section under small tidal range conditions is used for researching a submarine cable burying construction method, and the technical problem that submarine cable landing section laying construction cannot be avoided is solved.

Disclosure of Invention

The invention discloses a special ship for laying and constructing landing-section submarine cables under a small tidal range condition and a construction method, aiming at solving the problem of laying and protecting construction of landing-section submarine cables under a small tidal range condition.

As a first aspect, the invention provides a special ship for burying and constructing a sea cable at a landing section under a small tidal range condition, which comprises a ship body structure and deck equipment arranged on a deck and comprising a motor, a generator, an anchor machine and an anchor, and is characterized in that the ship body structure comprises two floating body structures with basically the same shape and size and a connecting structure for connecting the two floating body structures into a whole; and a water pump connected by a lifting device is hung on the portal frame spanned between the two floating body structures.

The structural strength of the ship body structure meets the requirement of the beach working condition.

The floating body structure is internally divided into a plurality of compartments by partition plates, and a marine submersible pump for regulating ballast water is arranged in the floating body structure.

The connecting structure can be a space steel structure comprising a second cross beam, a second inclined strut and a horizontal strut.

The connecting structure can be a box beam.

The gantry can be a fixed gantry comprising a stand column, a first cross beam, a first inclined strut and a lifting lug in the middle of the first cross beam.

The lifting device is preferably an electric hoist.

The water pump is preferably a high-pressure submersible pump.

As a second aspect, the invention provides a construction method for burying a submarine cable at a landing section under a small tidal range, which is characterized by comprising the following steps:

(1) the special ship for landing-section submarine cable burying construction enters a landing-section submarine cable burying construction sea area in a small tidal range area, and is anchored in place near a submarine cable burying starting point;

(2) an electric hoist hung on a portal frame of a special ship for landing submarine cable burying construction lifts a part of submarine cables, and an operator installs a cast iron sleeve on the submarine cables at the lifting part;

(3) the submarine cable section provided with the cast iron casing pipe is placed on the mud surface of the seabed, the ship is moved, and the electric hoist is started to hoist the submarine cable at the adjacent section;

(4) according to the steps (2) and (3), until the submarine cable section in the water part is completely provided with the cast iron sleeve;

(5) the special ship for submarine cable burying construction at the landing section returns to the submarine cable burying starting point again and is anchored in place;

(6) a high-pressure submersible pump hung on an electric hoist is put down to the position above a submarine cable below the water surface;

(7) starting the high-pressure submersible pump, damaging soil around the submarine cable by high-pressure water flow sprayed by the high-pressure submersible pump, sinking the submarine cable under the condition of dead weight, and finally burying the submarine cable below the mud surface of the seabed through natural desilting;

(8) according to the steps (5), (6) and (7), the special ship for the submarine cable burying construction at the landing section buries the submarine cable along the submarine cable route into the designed depth below the mud surface of the seabed in sections.

The invention has the beneficial effects that: the method provides a solution for the laying protection construction of the submarine cable at the landing section under the condition of small tidal range; the construction ship special for burying the submarine cable can freely go in and out of a preset sea area with small tidal range, and meets the requirements of the installation of the cast iron sleeve of the submarine cable and the buried submarine cable on hoisting construction.

Drawings

The following detailed description is to be read in connection with the accompanying drawings and the detailed description.

FIG. 1 is a front view of a ship dedicated for construction according to the present invention;

FIG. 2 is a side view of the ship for construction of the present invention;

FIG. 3 is a top view of the ship for construction according to the present invention;

FIG. 4 is a schematic diagram of the construction of installing a cast iron sleeve on a submarine cable by the special construction vessel of the invention;

FIG. 5 is a schematic view of the construction of the buried submarine cable of the ship specially used for construction.

Wherein: 1-a hull structure; 2-deck equipment; 3-gantry; 4-electric hoist; 5-high pressure submersible pump; 6-sea cable; 7-cast iron sleeve; 8-water surface; 9-seabed mud surface; 11-a floating body structure; 12-a linking structure; 21-a motor; 22-a generator; 23-an anchor machine; 24-an anchor; 31-upright post; 32-a first beam; 33-a first diagonal brace; 34-a lifting lug; 111-a separator; 112-marine submersible pumps; 121-a second beam; 122-a second diagonal brace; 123-horizontal support.

Detailed Description

Referring to fig. 1, 2 and 3, the construction vessel of the present invention includes a hull structure 1, a deck facility 2 disposed on a deck and including a motor 21, a generator 22, an anchor 23 and an anchor 24. The hull structure 1 comprises two floating structures 11 of substantially the same shape and size, a connecting structure 12 connecting the two floating structures 11 in one piece. The gantry 3 spans between the two floating body structures 12.

The structural strength of the hull structure 1 meets the requirements of the beach working condition. The interior of the floating body structure 11 is divided into a plurality of compartments by partitions 111, and a submersible pump 112 for ships for adjusting ballast water is built therein. The connecting structure 12 is a space steel structure including a second beam 121, a second diagonal brace 122, and a horizontal brace 123.

The gantry 3 comprises a vertical column 31, a first cross beam 32, a first inclined strut 33 and a lifting lug 34 in the middle of the cross beam. An electric hoist 4 is hung on the lifting lug 34 in the middle of the beam, and a high-pressure submersible pump 5 is hung below the electric hoist 4. The electric hoist 4 is used for controlling the high-pressure submersible pump 5 to enter water or be lifted above the water surface 8.

Referring to fig. 4 and 5, the invention provides a construction method for burying a landing sea cable under a small tidal range condition, which comprises the following steps:

(1) the special ship for landing submarine cable burying construction enters a landing submarine cable burying construction sea area in a small tidal range area, and is anchored in place near the burying start point of the submarine cable 6.

(2) An electric hoist 4 hung on a portal frame 3 special for landing submarine cable burying construction is used for hoisting a part of submarine cables 6, and an operator installs a cast iron sleeve 7 on the submarine cables 6 at the hoisting part.

(3) And (3) lowering the section of the submarine cable 6 provided with the cast iron casing pipe 7 onto the seabed mud surface 9, moving the ship, and starting the electric hoist 4 to hoist the section of the submarine cable 6 close to the ship.

(4) And (4) according to the steps (2) and (3), until the whole section of the submarine cable 6 in the underwater part is provided with the cast iron sleeve 7.

(5) The special ship for submarine cable burying construction at the landing section returns to the burying starting point of the submarine cable 6 again and is anchored in place;

(6) a high-pressure submersible pump 5 hung on an electric hoist 4 is lowered to the position above a submarine cable 6 below a water surface 8;

(7) and starting the high-pressure submersible pump 5, wherein high-pressure water flow sprayed by the high-pressure submersible pump 5 destroys soil around the submarine cable 6, and the submarine cable 6 sinks under the dead weight condition and is finally buried below the seabed mud surface 9 through natural desilting.

(8) According to the steps (5), (6) and (7), the special ship for the submarine cable burying construction at the landing section buries the submarine cable 6 along the submarine cable route into the designed depth below the seabed mud surface 9 in sections.

Claims (9)

1. The special ship for the submarine cable burying construction at the landing section under the condition of small tidal range comprises a ship body structure and deck equipment which is arranged on a deck and comprises a motor, a generator, an anchor machine and an anchor, and is characterized in that the ship body structure comprises two floating body structures with basically the same shape and size and a connecting structure for connecting the two floating body structures into a whole; and a water pump connected by a lifting device is hung on the portal frame spanned between the two floating body structures.

2. The vessel special for burying and constructing the landing sea cable under the small tidal range according to claim 1, wherein: the strength of the ship body structure meets the requirement of the beach working condition.

3. The vessel special for burying and constructing the landing sea cable under the small tidal range according to claim 1, wherein: the floating body structure is internally divided into a plurality of compartments by partition plates, and a marine submersible pump for regulating ballast water is arranged in the floating body structure.

4. The vessel special for burying and constructing the landing sea cable under the small tidal range according to claim 1, wherein: the connecting structure can be a space steel structure comprising a second cross beam, a second inclined strut and a horizontal strut.

5. The vessel special for burying and constructing the landing sea cable under the small tidal range according to claim 1, wherein: the connecting structure can be a box beam.

6. The vessel special for burying and constructing the landing sea cable under the small tidal range according to claim 1, wherein: the gantry can be a fixed gantry comprising a stand column, a first cross beam, a first inclined strut and a lifting lug in the middle of the first cross beam.

7. The vessel special for burying and constructing the landing sea cable under the small tidal range according to claim 1, wherein: the lifting device is preferably an electric hoist.

8. The vessel special for burying and constructing the landing sea cable under the small tidal range according to claim 1, wherein: the water pump is preferably a high-pressure submersible pump.

9. The construction method for burying the submarine cable at the landing section under the condition of small tidal range is characterized by comprising the following steps:

(1) the special ship for landing sea cable burying construction enters a landing sea cable burying construction sea area in a small tidal range area, and is anchored in place near a sea cable burying starting point;

(2) an electric hoist hung on a portal frame of a special ship for landing submarine cable burying construction lifts a part of submarine cables, and an operator installs a cast iron sleeve on the submarine cables at the lifting part;

(3) the submarine cable section provided with the cast iron casing pipe is placed on the mud surface of the seabed, the ship is moved, and the electric hoist is started to hoist the submarine cable at the adjacent section;

(4) according to the steps (2) and (3), until the submarine cable section in the water part is completely provided with the cast iron sleeve;

(5) the special ship for submarine cable burying construction at the landing section returns to the submarine cable burying starting point again and is anchored in place;

(6) a high-pressure submersible pump hung on an electric hoist is put down to the position above a submarine cable below the water surface;

(7) starting the high-pressure submersible pump, damaging soil around the submarine cable by high-pressure water flow sprayed by the high-pressure submersible pump, sinking the submarine cable under the condition of dead weight, and finally burying the submarine cable below the mud surface of the seabed through natural desilting;

(8) according to the steps (5), (6) and (7), the special ship for the submarine cable burying construction at the landing section buries the submarine cable along the submarine cable route into the designed depth below the mud surface of the seabed in sections.

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