A construction device suitable for trenching behind submarine cables

Abstract

The utility model discloses a construction device suitable for trenching behind submarine cables and pipes, including a frame, on which a ground-breaking component and a dredging component are installed; the device is lowered to the top of the cable and pipes where trenching is required through a hoisting device, and the device is straddled on the cable and pipes through operation by a diver, and the left and right ground-breaking spray pipe sections and the sewage suction pipe sections ride on both sides above the pipeline; the ground is sprayed and broken by a high-pressure water pump, and the high-pressure water is distributed to the ground-breaking spray pipe sections on the left and right sides through the main bifurcated pipe to spray the seabed, breaking the seabed soil to form a mud-water mixture, and the sewage suction pipe sections arranged with a height difference before and after the ground-breaking spray pipe section are sucked by the dredging pump to achieve layered rapid discharge to the outside of the cable and pipe trench, forming a concave groove at the bottom of the cable and pipe, meeting the pipeline burial depth requirements. The patent is easy to install and operate, has a light structure, is suitable for trenching before pipeline maintenance and local pipeline exposure treatment, and has good economic benefits and practical value.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering construction, in particular to a construction device suitable for trenching behind submarine pipes and cables. Background Art

[0002] In offshore oil development or offshore wind power projects, a large number of submarine pipelines or cables are used, which are the lifeline of fixed or floating offshore production units. In order to ensure the safe operation of submarine cables, trenches need to be dug for protection. By burying them to a certain depth below the mud surface, submarine cables are prevented from being damaged by shipping activities, fishing and other construction, which may lead to problems such as damage to cables, suspension of oil and gas fields, and inability to output offshore wind power.

[0003] At present, trenching is carried out by using a large-flow axial flow pump spray trenching machine, and the air lift method is used to drain the mud from the trench at the same time during each trenching. Although the flow rate of the axial flow pump is large, the pump head is relatively low. When the burial depth continues to increase, the axial flow pump's ability to break the ground becomes weaker and weaker, and the air lift method has a poor mud drainage effect. The mud after spraying cannot be flushed out of the trench and will still be deposited in the trench, thus affecting the trenching depth and resulting in more trenching construction times.

[0004] In order to solve the above problems, we proposed a construction device suitable for trenching behind submarine cables. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a construction device suitable for trenching behind submarine cables and pipes, and the utility model provides the following technical solutions:

[0006] A construction device suitable for trenching behind submarine cables and pipes, comprising a frame, on which a ground-breaking component and a dredging component are installed; the frame is composed of a sliding shoe and a structural frame, the structural frame is a door-type structure formed by splicing and welding seamless steel pipes, and the sliding shoe is installed at the lower part of the structural frame; the ground-breaking component is composed of a high-pressure water pump, a suction port component, a first mounting and fixing frame, and a ground-breaking pipe group, the high-pressure water pump is installed on the first mounting and fixing frame, the bottom of the first mounting and fixing frame is welded and fixed to the frame, the pump inlet flange of the high-pressure water pump is connected to the suction port component, and the pump outlet flange of the high-pressure water pump is connected to the ground-breaking pipe group; the dredging component is composed of a dredging pump, a second mounting and fixing frame, and a dredging pipe group, the dredging pump is installed on the second mounting and fixing frame, and the pump inlet flange of the dredging pump is connected to the dredging pipe group.

[0007] Preferably, the sliding shoe is a box body with a triangular cross-section formed by welding steel plates, and a pulling hanging point is welded to the front end of the sliding shoe; the structural frame is composed of a tubular beam frame, and four groups of hanging points are symmetrically arranged on the upper part of the tubular beam frame.

[0008] Preferably, the ground-breaking pipe group is a forked pipe assembly, which consists of a main forked pipe, an intermediate connecting joint, a ground-breaking spray pipe section and a fixed connecting rod. The main forked pipe divides the water outlet into two left and right channels. The intermediate connecting joint flange is welded to the lower end of the main forked pipe. The ground-breaking spray pipe section flange is connected to the lower end of the intermediate connecting joint. The main forked pipe is welded with the fixed connecting rod for fixing to the frame.

[0009] Preferably, the dredging pipe group is a forked pipe assembly, which consists of a main pipe elbow, a forked main pipe, an intermediate short section, a sewage suction pipe section and a connecting and fixing short section. The main pipe elbow flange is connected to the suction port of the dredging pump, the upper end of the forked main pipe is welded to the main pipe elbow as a whole, the lower end flange of the forked main pipe is welded with the intermediate short section, the lower end flange of the intermediate short section is connected to the sewage suction pipe section, and the connecting and fixing short section for fixing to the frame is welded on the forked main pipe.

[0010] Preferably, the ground-breaking jetting pipe section is a structural member made of a seamless steel pipe and having a single-head welded flange with a certain closing.

[0011] Preferably, the sewage suction pipe section is a filter mesh-shaped pipe section formed by opening holes in a seamless steel pipe.

[0012] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0013] This patent allows the equipment to ride on the pipe and cable through the operation of divers, with the left and right ground-breaking and spraying pipe sections and the sewage suction pipe section riding on both sides above the pipeline; the ground is broken by spraying through a high-pressure water pump, and the high-pressure water is distributed to the ground-breaking and spraying pipe sections on the left and right sides through the main bifurcation pipe to spray the seabed, breaking the seabed soil to form a mud-water mixture, which is quickly discharged to the outside of the pipe and cable trench through the suction pipe sections arranged with a height difference before and after the ground-breaking and spraying pipe section through the dredging pump, forming a concave trench at the bottom of the pipe and cable to meet the pipeline burial depth requirements; the whole set of equipment is easy to install and operate, with a light structure, suitable for trenching before pipeline maintenance and local pipeline exposure treatment, with good economic benefits and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used to illustrate the purpose of the preferred embodiment and are not considered to be limitations of the present invention. In the entire drawings, the same reference numerals are used to represent the same parts.

[0015] In the attached picture:

[0016] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall structure of the preferred embodiment of the utility model;

[0018] Figure 3 It is a schematic side view of the overall structure of a preferred embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of the frame structure of the trenching device of the preferred embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the earth-breaking components of the trenching device of the preferred embodiment of the utility model.

[0021] Figure 6 It is a schematic diagram of the composition of the dredging components of the trenching device of the preferred embodiment of the utility model;

[0022] Figure 7 It is a schematic diagram of the overall transportation and storage state of the preferred embodiment of the utility model.

[0023] in, Figures 1 to 7 The corresponding relationship between the reference numerals and the components is as follows:

[0024] 1. Frame; 11. Slipper; 111. Pulling and hanging point; 12. Structural frame; 121. Hanging point; 122. Pipe beam frame; 2. Ground-breaking assembly; 21. High-pressure water pump; 22. Suction port assembly; 23. First mounting and fixing frame; 24. Ground-breaking pipe group; 241. Main bifurcated pipe; 242. Middle connecting section; 243. Ground-breaking spraying pipe section; 244. Fixed connecting rod; 3. Dredging assembly; 31. Dredging pump; 32. Second mounting and fixing frame; 33. Dredging pipe group; 331. Main pipe elbow; 332. Bifurcated main pipe; 333. Middle short section; 334. Sewage suction pipe section; 335. Connecting and fixing short section. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] Combine the following Figures 1 to 7 The submarine cable rear trenching construction device of the embodiment of the utility model is described, and the device comprises: a frame 1, a soil breaking component 2, and a dredging component 3;

[0028] The frame 1 is the main structural body of the entire submarine cable trenching construction device. It is a steel pipe welded door-shaped structure with sliding boots on both sides to prevent the seabed from sinking. Figure 4 As shown, its composition includes a sliding shoe 11 and a structural frame 12. The sliding shoe 11 is a box body with a triangular cross section welded by steel plates, which is welded or flanged to the lower part of the structural frame 12. The bottom of the box body has a certain width to reduce the relative pressure of the equipment to the ground, which is conducive to not sinking on the softer seabed. A steel plate cutting and processing pulling and hanging point 111 is welded at the front end, which is connected to the winch wire rope on the ship by installing a shackle to achieve pulling and moving during construction. The structural frame 12 is the load-bearing body of the whole set of equipment. It is a pipe beam frame 122 with a certain width of a portal structure spliced ​​and welded by seamless steel pipes. Four symmetrical upper hanging points 121 are set on the upper part to meet the needs of construction and hanging. The matching shackles are selected according to the construction requirements, and the orifice plate meets the shackle installation. According to different equipment designs, the size of the equipment installed on the upper part is different, and the width, length and selected seamless pipe specifications of the rack 1 are different, which ultimately meets the strong structural frame used for equipment installation and construction.

[0029] The ground-breaking component 2 is installed on the frame 1. It is the main ground-breaking mechanism of the construction device for trenching behind submarine cables. It consists of: a high-pressure water pump 21, a suction port component 22, a first mounting bracket 23, and a ground-breaking pipe group 24. The high-pressure water pump 21 is a water pump with sufficient flow and outlet pressure. It is connected to the water through a cable for start and stop operations. The water pump can adapt to certain turbid seawater and is installed on the first mounting bracket 23. The pump inlet flange is connected to the suction port component 22, and the outlet flange is connected to the ground-breaking pipe group 24. The suction port component 22 is an elbow in the form of a filter formed by opening holes in a seamless steel pipe. It is installed upward to prevent large particles of impurities from entering the high-pressure water pump 21 and causing damage. It has a certain length and a sufficient number of holes to meet the suction flow requirements. The first mounting bracket 23 is a frame bracket welded with steel sections, which fixes the high-pressure water pump 21 inside. The bottom is welded to the frame 1 to fix the high-pressure water pump 21; Figure 5As shown, the ground-breaking pipe group 24 connected to the outlet is a bifurcated pipe assembly, and the water outlet is divided into two left and right channels by connecting the bifurcated main bifurcated pipe 241 with flanges. The intermediate connecting section 242 is formed by welding flanges at both ends of seamless steel pipes of different lengths. By connecting the intermediate connecting sections 242 of different lengths, the ground-breaking spraying pipe section 243 connected to the lower flange is inserted into the mud surface at different depths. The ground-breaking spraying pipe section 243 is a structural member made of seamless steel pipe with a single-head welded flange with a certain closing, which realizes the high-pressure water spraying shape control of the high-pressure water pump 21, better realizes the ground-breaking effect, and can also open holes on the outer wall to form injection holes, so as to better crush the soil. Since the whole set of ground-breaking components 2 has a large mass, the necessary fixed connecting rods 244 can be welded to the main bifurcated pipe 241 and other pipe sections connected at the bottom, and fixed to the structural frame 12 to improve the construction stability.

[0030] The dredging assembly 3 is installed on the frame 1. It is the main dredging mechanism of the construction device for trenching behind submarine cables. It consists of a dredging pump 31, a second mounting bracket 32, and a dredging pipe group 33. The dredging pump 31 is a large-flow water pump with sufficient flow and a head of not less than 10m. It is connected to the water through a cable for start and stop operations. The water pump can adapt to seawater with a certain sediment concentration. It is installed on the second mounting bracket 32. The pump inlet flange is connected to the dredging pipe group 33, and the outlet is open and arranged upward. The second mounting bracket 32 ​​is a frame bracket welded with steel sections. The dredging pump 31 is fixed inside, and the bottom is welded to the frame 1 to fix the dredging pump 31. Figure 6As shown, the dredging pipe group 33 is a pipeline component with a certain channel length and a fork. The main pipe elbow 331 is flange-connected to the suction port of the dredging pump 31. A certain bend is formed by splicing a seamless steel pipe combination to avoid interference on the structural frame 12, and the forked main pipe 332 is connected. The forked main pipe 332 is a pipeline component with a fork, which is welded and manufactured with seamless steel pipes. The upper end is welded to the main pipe elbow 331 as a whole. The flange welded at the lower part is connected to the intermediate short section 333. The intermediate short section 333 is formed by welding flanges at both ends of seamless steel pipes of different lengths. By connecting the intermediate short sections 333 of different lengths, the suction pipe section 334 connected by the lower flange is inserted into the mud surface at different depths to achieve dredging at different depths. The suction pipe section 334 is a filter mesh pipe section formed by opening holes in seamless steel pipes, which is flange-connected to the intermediate short section 333. The filter holes prevent large particles of impurities from entering the dredging pump 31 and causing damage. It has a certain length and a sufficient number of holes to meet the suction flow requirements. Since the ground-breaking assembly 2 breaks the ground quickly, it is necessary to achieve rapid silt removal as much as possible. Therefore, intermediate short sections 333 of different lengths are arranged along the front and rear of the frame 1 in the ground-breaking spray pipe section 243, so that the silt removal depths of the front and rear sewage suction pipe sections 334 are different, so as to better achieve layered rapid silt removal. Since the entire set of silt removal assembly 3 has a large mass, the necessary connecting and fixing short sections 335 can be welded to the main pipe elbow 331 and the bifurcated main pipe 332 and other pipe sections connected at the bottom, and fixed to the structural frame 12 to improve construction stability.

[0031] The specific installation steps are:

[0032] Step 1: Complete the pressure maintenance of the equipment as required, transport the equipment to the dock by truck and load it onto the ship. Figure 7 The integrated unit shown in the figure has two piers welded in advance on the deck of the construction ship to meet the requirements of raising the sliding shoe 11, which is conducive to the installation of the sewage suction pipe section 334 without interference. After hoisting and loading, the high-pressure water pump 21 and the dredging pump 31 cables are connected to install the pipe section, and finally the Figure 1 The form shown.

[0033] Step 2: The construction ship is in place, the lifting sling is connected to the lifting point 121, the trenching construction device is lowered to the position where the trenching is required after lifting the submarine cable, and the left and right ground-breaking and spraying pipe sections 243 and the sewage suction pipe section 334 are operated by divers to straddle the pipeline, and the entire frame 1 straddles the pipeline. Record the height of the lifting position when the bottom of the sewage suction pipe section 334 touches the mud.

[0034] Step 3: Slowly lower the construction device for trenching behind the submarine cable, and start the high-pressure water pump 21 and the dredging pump 31 at the same time, move along the route direction and gradually lower it to the bottom of the suction pipe section 334 to the depth required for trenching, forming a cable sinking slope. The high-pressure water pump 21 is used to spray and break the soil, and the high-pressure water is divided into the soil-breaking spraying pipe sections 243 on the left and right sides through the main bifurcated pipe 241 to spray the seabed, breaking the seabed soil to form a mud-water mixture, which is sucked and discharged to the outside through the suction pipe section 334 arranged before and after the soil-breaking spraying pipe section 243 via 3.1 - dredging pump, forming a groove at the bottom of the cable. Then move the ship, control the construction device for trenching behind the cable to move along the route direction of the pipeline, and adjust the equipment up and down appropriately to achieve a better trenching effect.

[0035] Step 4: After all trenching areas are completed, move the equipment and slowly lift it to form a transition slope for the pipeline until the sewage suction pipe section 334 is completely out of the mud surface, stop the high-pressure water pump 21 and the dredging pump 31, lift the equipment to the deck stand, flush with dilute water, and the construction is completed.

[0036] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A construction device suitable for trenching of submarine cables, comprising a frame (1), characterized in that: The frame (1) is provided with a soil-breaking component (2) and a dredging component (3); the frame (1) is composed of a sliding shoe (11) and a structural frame (12); the structural frame (12) is a door-shaped structure formed by splicing and welding seamless steel pipes; the sliding shoe (11) is installed at the bottom of the structural frame (12); the soil-breaking component (2) is composed of a high-pressure water pump (21), a suction port component (22), a first mounting bracket (23), and a soil-breaking pipe group (24); the high-pressure water pump (21) is installed on the first mounting bracket (23). The bottom of the first mounting frame (23) is welded and fixed to the frame (1); the pump inlet flange of the high-pressure water pump (21) is connected to the suction port assembly (22); and the pump outlet flange of the high-pressure water pump (21) is connected to the earth-breaking pipe assembly (24); the dredging assembly (3) is composed of a dredging pump (31), a second mounting frame (32) and a dredging pipe assembly (33); the dredging pump (31) is mounted on the second mounting frame (32); and the pump inlet flange of the dredging pump (31) is connected to the dredging pipe assembly (33).

2. A construction device suitable for trenching behind submarine cables according to claim 1, characterized in that: The sliding shoe (11) is a box body with a triangular cross section formed by welding steel plates, and a pulling hanging point (111) is welded to the front end of the sliding shoe (11); the structural frame (12) is composed of a tube beam frame (122), and four groups of upper hanging points (121) are symmetrically arranged on the upper part of the tube beam frame (122).

3. A construction device suitable for trenching behind submarine cables according to claim 1, characterized in that: The soil-breaking pipe assembly (24) is a pipe assembly with a fork, and is composed of a main fork pipe (241), an intermediate connection joint (242), a soil-breaking spray pipe joint (243), and a fixed connection rod (244). The main fork pipe (241) divides the water outlet into two left and right outlets. The intermediate connection joint (242) is flange-welded to the lower end of the main fork pipe (241). The soil-breaking spray pipe joint (243) is flange-connected to the lower end of the intermediate connection joint (242). The main fork pipe (241) is welded with the fixed connection rod (244) for fixing to the frame (1).

4. A construction device suitable for trenching behind submarine cables according to claim 1, characterized in that: The desilting pipe assembly (33) is a pipe assembly with a fork, and is composed of a main pipe elbow (331), a forked main pipe (332), an intermediate short section (333), a sewage suction pipe section (334), and a connecting and fixing short section (335). The main pipe elbow (331) is flange-connected to the suction port of the desilting pump (31); the upper end of the forked main pipe (332) is welded to the main pipe elbow (331) as a whole; the lower end flange of the forked main pipe (332) is welded with the intermediate short section (333); the lower end flange of the intermediate short section (333) is flange-connected with the sewage suction pipe section (334); and the connecting and fixing short section (335) for fixing to the frame (1) is welded to the forked main pipe (332).

5. A construction device suitable for trenching behind submarine cables according to claim 3, characterized in that: The ground-breaking jetting pipe section (243) is a structural member made of a seamless steel pipe and having a single-head welded flange with a certain closing.

6. A construction device suitable for trenching behind submarine cables according to claim 4, characterized in that: The sewage suction pipe segment (334) is a filter screen-shaped pipe segment formed by opening holes in a seamless steel pipe.

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