Hard rock geological submarine cable anchoring well device and construction method thereof

Abstract

The application relates to a hard rock geological submarine cable anchoring well device and a construction method thereof, and belongs to the technical field of optical cable laying, which comprises a well body opened on a hard rock surface line, the well body is a hollow structure formed by a plurality of concrete inner walls, an openable cover plate is arranged at the top end of the well body, a plurality of embedded parts are arranged at the bottom end of the well body, each embedded part is fixedly connected with a cable fixing device for fixing armored submarine cables, a plurality of pull-in anchor rods and a plurality of drag anchor rods embedded in the rock layer are arranged on the concrete inner wall at the bottom end of the well body, the pull-in anchor rods are arranged in the direction of the drag force away from the ocean, and the drag anchor rods are arranged in the direction of the drag force close to the ocean. The application fully utilizes the bearing characteristics of the hard rock, reduces the excavation, reduces the concrete amount, reduces the hole forming cost in the hard rock layer, and improves the work efficiency.

Description

Technical Field

[0001] This invention relates to a submarine cable anchoring device and its construction method in hard rock geology, belonging to the field of optical cable laying technology. Background Technology

[0002] Submarine cables are the primary infrastructure connecting telecommunications and network communications between different locations. Spanning the seabed, they provide a reliable, inexpensive, and high-speed data transmission platform for billions of people worldwide using telephones, the internet, television, and mobile phones. The earliest submarine cable construction dates back to 1850, and to this day, submarine cables have become a vital link connecting people. Submarine cables are typically composed of optical fibers or electrical cables, usually insulated with multiple layers of polymer materials to ensure proper transmission of telecommunication signals. Furthermore, due to the high pressure of water, the outer layer of submarine cables is often reinforced with layers of heavy-duty steel or fiberglass cables to enhance strength and reliability and support the weight deposited in the sea.

[0003] After submarine cables are brought ashore, they need to be anchored to a stable foundation. The anchoring devices must meet various requirements to ensure stability and safety. For example, the anchoring devices for submarine cables should be located on geologically stable shallows, shorelines, or structurally sound platforms. The anchoring devices should be able to effectively secure the submarine cables and have strong resistance to wind and wave impacts and good resistance to seawater corrosion. They should also be easy to install and maintain, and have reliable functionality. Submarine cables connecting offshore platforms, wind turbines, etc., should be secured using anchoring measures to reduce cable wear.

[0004] Existing submarine cable anchoring devices typically use a fixed device to fix them to a stable structural base plate or foundation soil. Traditional cable well construction methods cannot meet the requirements for anchoring device fixation and safety protection. Furthermore, there are no specific cable well construction methods or corresponding anchoring devices for hard rock geology.

[0005] Chinese invention patent CN104852340A discloses an anti-siltation type submarine cable anchoring well. The top of the well body is provided with a cooling seawater inlet. A cooling seawater pool and a sedimentation pool located directly below the cooling seawater inlet are formed inside the well body. The sedimentation pool and the cooling seawater pool are connected at the upper part of the well body. The bottom of the sedimentation pool is provided with a sand discharge port connected to the outside. The submarine cable anchoring clamp is located at the bottom of the cooling seawater pool. On the well body located on the side of the submarine cable inlet, there is a float inlet connected to the outside and a float lifting chamber connected to the float inlet. The float lifting chamber contains a liftable float.

[0006] The above-mentioned examples are applicable to silty marine environments, but they cannot exert their advantages in rocky strata, and therefore urgently need to be improved. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, this invention designs a submarine cable anchoring well device and its construction method for hard rock geology. It makes full use of the bearing characteristics of hard rock, reduces excavation, reduces concrete volume, lowers drilling costs in hard rock layers, and improves work efficiency.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] Technical Solution 1

[0010] A submarine cable anchoring device for hard rock geological conditions includes a well body excavated on the surface of the hard rock. The well body is a hollow structure formed by several concrete inner walls. An openable cover plate is provided at the top of the well body. Several embedded parts are provided at the bottom of the well body. Each embedded part is fixedly connected to a cable fixing device for fixing armored submarine cables. Several tie rods and several drag rods are installed on the concrete inner wall at the bottom of the well body, all of which are embedded in the rock strata. The tie rods are arranged in the direction of drag force away from the ocean, and the drag rods are arranged in the direction of drag force closer to the ocean.

[0011] Furthermore, the cover plate is composed of several interlocking and separable panels.

[0012] Furthermore, the embedded part is connected to some of the tie rods and some of the drag rods.

[0013] Technical Solution Two

[0014] A construction method for a submarine cable anchoring and cementing device based on hard rock geology in the above-mentioned technical solution one includes the following steps:

[0015] S1: Using a drilling rig, several first forming holes are drilled at intervals on the surface of hard rock in a circumferential arrangement.

[0016] S2: Excavate the isolated rock mass inside several first forming holes arranged in a circumferential direction and transport it outward to form a well body;

[0017] S3: Drill a second forming hole between any two adjacent first forming holes, and the second forming hole is connected to the first forming hole;

[0018] S4: Install several tie rods and several drag rods at the bottom of the well body, wherein the tie rods are arranged in the direction of dragging force away from the ocean, and the drag rods are arranged in the direction of dragging force closer to the ocean;

[0019] S5: Pour a certain thickness of concrete around the well body and at the bottom to form a concrete inner wall, and install an openable cover plate on the top of the well body. At the same time, install embedded parts at the bottom of the well body near the tie rod and drag rod, and install cable fixing devices on the embedded parts.

[0020] S6: After the submarine cable enters the well body, the armored submarine cable is fixed to the cable fixing device, and the unarmored submarine cable formed after removing the armor of the submarine cable is connected to the land cable.

[0021] Furthermore, in step S, the first forming hole is formed using a small-diameter water drill and by using a skip-hole method.

[0022] Furthermore, in step S2, the isolated rock mass is first loosened by static fracturing, and then transported away by light mechanical excavation.

[0023] Furthermore, in step S3, the second forming hole is formed using a small-diameter water drill or a dedicated anchor drill.

[0024] Furthermore, the embedded part is fixed to the cable fixing device by welding.

[0025] Furthermore, the inner concrete wall is made of high-quality concrete.

[0026] Several of the first forming holes are arranged in a rectangular shape.

[0027] Compared with the prior art, the present invention has the following features and beneficial effects:

[0028] 1. In this invention, the cable fixing device is fixed by using anchor rods in the opposite direction to the drag force of the submarine cable, which changes the traditional structural form of using the self-weight of the well structure to balance the drag force of the submarine cable and reduces the amount of concrete used.

[0029] 2. In this invention, hard rock is fully utilized as the well wall and bottom plate of the anchoring well in hard rock mass, which further saves the amount of concrete used.

[0030] 3. In this invention, after using a small-diameter water-jet drill to make holes, the rock is loosened by static fracturing in isolated rock bodies and then mechanically excavated to form holes. This reduces the cost of forming holes in hard rock layers and improves work efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic plan view of drilling and fracturing in hard rock according to the present invention;

[0032] Figure 2 This is a schematic cross-sectional view of the drilling and fracturing process in hard rock according to the present invention.

[0033] Figure 3 This is a schematic diagram of the connection between the submarine cable anchoring well and the submarine cable of the present invention.

[0034] The attached diagrams are labeled as follows: 1. First forming hole; 2. Second forming hole; 3. Isolated rock mass; 4. Hard rock mass; 6. Hard rock surface line; 7. Tie rod; 8. Drag rod; 9. Concrete inner wall; 10. Cover plate; 11. Embedded part; 12. Cable fixing device; 13. Armored submarine cable; 14. Unarmored submarine cable; 15. Well body. Detailed Implementation

[0035] The present invention will now be described in more detail with reference to the embodiments.

[0036] It should be noted that the hard rock referred to in this invention refers to the rock strata f tk ≥60MPa;

[0037] The small-diameter water drill referred to in this invention specifically refers to a water drill with a drill rod diameter of less than or equal to 200 mm.

[0038] like Figures 1 to 3 As shown, a submarine cable anchoring device for hard rock geological conditions includes a well body 15 located on the hard rock surface line 6. The well body 15 is a hollow structure formed by several concrete inner walls 9. An openable cover plate 10 is provided at the top of the well body 15. Several embedded parts 11 are provided at the bottom of the well body 15. Each embedded part 11 is fixedly connected to a cable fixing device 12 for fixing armored submarine cables 13. Several tie rods 7 and several drag rods 8 are installed on the concrete inner walls 9 at the bottom of the well body 15, all embedded in the rock strata. The tie rods 7 are set in the direction of dragging force away from the ocean, and the drag rods 8 are set in the direction of dragging force closer to the ocean.

[0039] Furthermore, the cover plate 10 is composed of several interlocking and detachable panels, making it easy to disassemble and open.

[0040] Furthermore, the embedded part 11 is connected to some of the tie rods 7 and some of the drag rods 8, which improves the overall strength.

[0041] As can be seen from the above description, the beneficial effects of the present invention are as follows: by using anchor rods in the opposite direction to the drag force of the submarine cable to complete the fixing of the cable fixing device 12, the traditional structural form of using the self-weight of the well structure to balance the drag force of the submarine cable is changed, reducing the amount of concrete used. At the same time, in the hard rock mass 4, the hard rock is fully utilized as the well wall and bottom plate of the anchoring well, further saving the amount of concrete used.

[0042] A construction method for a submarine cable anchoring and cementing device based on the aforementioned hard rock geology includes the following steps:

[0043] S1: Using a drilling rig, several first forming holes 1 are drilled at intervals on the surface of the hard rock surface line 6 in a circumferential arrangement;

[0044] S2: Excavate the isolated rock mass 3 inside several first forming holes 1 arranged in a circumferential direction and transport it outward to form a well body 15;

[0045] S3: Drill a second forming hole 2 between any two adjacent first forming holes 1, and the second forming hole 2 is connected to the first forming hole 1;

[0046] S4: Install several tie rods 7 and several drag rods 8 at the bottom of the well body 15, wherein the tie rods 7 are set in the direction of dragging force away from the ocean, and the drag rods 8 are set in the direction of dragging force closer to the ocean.

[0047] S5: A concrete inner wall 9 of a certain thickness is poured around and at the bottom of the well body 15, and an openable cover plate 10 is installed on the top of the well body 15. At the same time, an embedded part 11 is installed at the bottom of the well body 15 near the tie rod 7 and the dragging rod 8, and a cable fixing device 12 is installed on the embedded part 11.

[0048] S6: After the submarine cable enters the well body 15, the armored submarine cable 13 is fixed to the cable fixing device 12, and the unarmored submarine cable 14 formed after the armor of the submarine cable is removed is connected to the land cable.

[0049] Furthermore, in step S1, the first forming hole 1 is formed using a small-diameter water drill and by using a skip-hole method.

[0050] Furthermore, in step S2, the isolated rock mass 3 is first loosened by static fracturing, and then transported away by light mechanical excavation.

[0051] Furthermore, in step S3, the second forming hole 2 is formed using a small-diameter water drill or a dedicated anchor drill.

[0052] Furthermore, the embedded part 11 is fixed to the cable fixing device 12 by welding.

[0053] Furthermore, the inner concrete wall 9 is made of high-quality concrete.

[0054] Furthermore, several first forming holes 1 are arranged in a rectangular shape.

[0055] As can be seen from the above description, the beneficial effects of the present invention are as follows: after using a small-diameter water-jet drill to make holes, the rock is loosened by static fracturing in isolated rock bodies and then mechanically excavated, which reduces the cost of drilling in hard rock layers and improves work efficiency.

[0056] Example 1

[0057] like Figures 1 to 3 As shown, a submarine cable anchoring device for hard rock geological conditions includes a well body 15 located on the hard rock surface line 6. The well body 15 is a hollow structure formed by several concrete inner walls 9. An openable cover plate 10 is provided at the top of the well body 15. Several embedded parts 11 are provided at the bottom of the well body 15. Each embedded part 11 is fixedly connected to a cable fixing device 12 for fixing armored submarine cables 13. Several tie rods 7 and several drag rods 8 are installed on the concrete inner walls 9 at the bottom of the well body 15, all embedded in the rock strata. The tie rods 7 are set in the direction of dragging force away from the ocean, and the drag rods 8 are set in the direction of dragging force closer to the ocean.

[0058] Furthermore, the cover plate 10 is composed of several interlocking and separable panels.

[0059] Furthermore, the embedded part 11 is connected to part of the tie rod 7 and part of the drag rod 8.

[0060] In this embodiment, the cable fixing device 12 is fixed by using anchor bolts in the opposite direction to the cable drag force, which changes the traditional structural form of using the self-weight of the well structure to balance the cable drag force, reducing the amount of concrete used. At the same time, in the hard rock mass 4, the hard rock is fully utilized as the well wall and bottom plate of the anchoring well, further saving the amount of concrete used.

[0061] Example 2

[0062] A construction method for a submarine cable anchoring and cementing device based on hard rock geology in Embodiment 1 above includes the following steps:

[0063] S1: Using a drilling rig, several first forming holes 1 are drilled at intervals on the surface of the hard rock surface line 6 in a circumferential arrangement;

[0064] In this embodiment, the internal clearance dimensions of the anchoring well need to be 4m long × 3m wide, and the cavity formed by several first forming holes 1 is 4.4m × 3.4m. After pouring concrete with a wall thickness of 0.2m, the clearance dimensions formed are 4m × 3m.

[0065] S2: Excavate the isolated rock mass 3 inside several first forming holes 1 arranged in a circumferential direction and transport it outward to form a well body 15;

[0066] S3: Drill a second forming hole 2 between any two adjacent first forming holes 1, and the second forming hole 2 is connected to the first forming hole 1;

[0067] S4: Install several tie rods 7 and several drag rods 8 at the bottom of the well body 15, wherein the tie rods 7 are set in the direction of dragging force away from the ocean, and the drag rods 8 are set in the direction of dragging force closer to the ocean.

[0068] S5: A concrete inner wall 9 of a certain thickness is poured around and at the bottom of the well body 15, and an openable cover plate 10 is installed on the top of the well body 15. At the same time, an embedded part 11 is installed at the bottom of the well body 15 near the tie rod 7 and the dragging rod 8, and a cable fixing device 12 is installed on the embedded part 11.

[0069] S6: After the submarine cable enters the well body 15, the armored submarine cable 13 is fixed to the cable fixing device 12, and the unarmored submarine cable 14 formed after the armor of the submarine cable is removed is connected to the land cable.

[0070] Furthermore, in step S1, the first forming hole 1 is formed using a small-diameter water drill and by using a skip-hole method.

[0071] Furthermore, in step S2, the isolated rock mass 3 is first loosened by static fracturing, and then transported away by light mechanical excavation.

[0072] Furthermore, in step S3, the second forming hole 2 is formed using a small-diameter water drill or a dedicated anchor drill.

[0073] Furthermore, the embedded part 11 is fixed to the cable fixing device 12 by welding.

[0074] Furthermore, the inner concrete wall 9 is made of high-quality concrete.

[0075] Furthermore, several first forming holes 1 are arranged in a rectangular shape.

[0076] In this embodiment, a method of drilling holes by using a small-diameter water-jet drill in a skip-drilling manner, followed by static cracking to loosen the rock within an isolated rock mass and then mechanically excavating it, reduces the cost of drilling holes in hard rock layers and improves work efficiency.

[0077] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0078] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0079] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A construction method for a submarine cable anchoring and cementing device based on hard rock geology, characterized in that: Includes the following steps: S1: Using a drilling rig, several first forming holes (1) are drilled at intervals on the surface of the hard rock surface line (6) in a circumferential arrangement. S2: Excavate the isolated rock mass (3) inside several first forming holes (1) arranged in a circumferential direction and transport it outward to form a well body (15). S3: Drill a second forming hole (2) between any two adjacent first forming holes (1), and the second forming hole (2) is connected to the first forming hole (1); S4: Install several tie rods (7) and several drag rods (8) at the bottom of the well body (15), wherein the tie rods (7) are set in the direction of dragging force away from the ocean, and the drag rods (8) are set in the direction of dragging force close to the ocean; S5: Concrete of a predetermined thickness is poured around the well body (15) and at the bottom to form a concrete inner wall (9), and an openable cover plate (10) is installed on the top of the well body (15). At the same time, embedded parts (11) are installed at the bottom of the well body (15) near the tie rod (7) and drag rod (8), and cable fixing devices (12) are installed on the embedded parts (11). S6: After the submarine cable lands and enters the well body (15), the armored submarine cable (13) is fixed on the cable fixing device (12), and the unarmored submarine cable (14) formed after the armor of the submarine cable is removed is connected to the land cable. The cable anchoring device for hard rock geological conditions includes a well body (15) opened on the hard rock surface line (6). The well body (15) is a hollow structure formed by several concrete inner walls (9). The top of the well body (15) is provided with an openable cover plate (10). Several embedded parts (11) are provided at the bottom of the well body (15). Each embedded part (11) is fixedly connected to a cable fixing device (12) for fixing armored submarine cable (13). Several tie rods (7) and several drag rods (8) are installed on the concrete inner wall (9) at the bottom of the well body (15), which are embedded in the rock strata. The tie rods (7) are set in the direction of drag force away from the ocean, and the drag rods (8) are set in the direction of drag force closer to the ocean. The embedded part (11) is connected to part of the tie rod (7) and part of the drag rod (8).

2. The construction method of the submarine cable anchoring well device in hard rock geology according to claim 1, characterized in that: In step S1, the first forming hole (1) is formed using a small-diameter water drill and by skipping holes.

3. The construction method of the submarine cable anchoring well device in hard rock geology according to claim 1, characterized in that: In step S2, the isolated rock mass (3) is first loosened by static cracking, and then transported away by light mechanical excavation.

4. The construction method of the submarine cable anchoring well device in hard rock geology according to claim 1, characterized in that: In step S3, the second forming hole (2) is formed by using a small-diameter water drill or by using an anchor drill.

5. The construction method of the submarine cable anchoring well device in hard rock geology according to claim 1, characterized in that: The embedded part (11) is fixed to the cable fixing device (12) by welding.

6. The construction method of the submarine cable anchoring well device in hard rock geology according to claim 1, characterized in that: The inner concrete wall (9) is made of high-quality concrete.

7. The construction method of the submarine cable anchoring well device in hard rock geology according to claim 1, characterized in that: Several of the first forming holes (1) are arranged in a rectangular shape.

8. The construction method of the submarine cable anchoring well device in hard rock geology according to claim 1, characterized in that: The cover plate (10) is composed of several interlocking and separable panels.

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