Mooring type seabed anchoring clamp

Abstract

The utility model belongs to the technical field of clamps, and particularly relates to a mooring type seabed anchoring clamp which comprises a metal shell, an elastic wear-resistant sleeve, two metal rings and a plurality of metal blocks. By arranging the metal rings which are axially arranged at intervals and adopting a double-mooring-rope connecting mode, the submarine cable is ensured not to be excessively influenced by torsion and overturning force, the elastic wear-resisting sleeve is additionally arranged in the metal shell, the elastic wear-resisting sleeve can be better attached to the surface of the submarine cable through tight pressing, the clamping capacity of the clamp is improved, and the service life of the submarine cable is prolonged. And finally, a metal block is arranged on the periphery of the metal shell, and corrosion prevention of clamp metal is achieved in an electrochemical mode, so that the service life of the clamp is effectively prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of clamp technology, specifically relating to a mooring-type seabed anchoring clamp. Background Technology

[0002] With the continuous development of marine resources, the application of dynamic submarine cables has increased significantly. These cables, operating in the marine environment, are constantly subjected to the strong impacts of waves and ocean currents, resulting in a state of constant swaying. They also face the threat of seawater erosion, all of which can lead to cable failure and significant economic losses. To solve this problem, submarine anchoring clamps are needed to stabilize the cables, reducing their swaying in the water and effectively extending their service life.

[0003] In existing technologies, Haver-type clamps are often used to fix submarine cables. The two halves of the clamp are connected and fixed by bolts and then installed on the surface of the submarine cable. The material is usually stainless steel. The clamps are tightened by applying force through the bolts, and the friction between the two prevents the clamps from sliding relative to the submarine cable.

[0004] However, the above-mentioned fixtures still have the following problems:

[0005] 1. Friction is mainly formed by the contact and compression between the inner wall of the clamp and the outer sheath of the submarine cable. Due to the high hardness of the stainless steel clamp, it is difficult to make the clamp and the surface of the submarine cable fully contact each other by tightening the bolts, resulting in a small friction between the two and making the clamping effect of the clamp unstable.

[0006] 2. When the submarine cable itself is subjected to torsional or overturning forces, the lack of unloading channels will cause the forces to accumulate inside the cable, thus seriously affecting the service life of the cable.

[0007] 3. Even with stainless steel materials, corrosion from seawater cannot be avoided, making it difficult for the fixture to reach its expected service life. Utility Model Content

[0008] The purpose of this invention is to provide a mooring-type seabed anchoring clamp that solves the technical problems of poor clamping effect, inability to release torque stress, and short service life of existing Haver-type clamps.

[0009] This utility model discloses a mooring-type seabed anchoring clamp, comprising:

[0010] The metal casing has two axially spaced annular grooves on its outer periphery.

[0011] An elastic, wear-resistant sleeve is installed inside the metal shell and then fitted onto the submarine cable.

[0012] Two metal rings are rotatably fitted onto the outside of the metal shell and are locked into the ring grooves one by one; and each of the metal rings has a lifting lug at both ends;

[0013] Multiple metal blocks are spaced apart and installed on the outer periphery of the metal shell, and their activity is greater than that of the metal shell and the metal ring.

[0014] This application ensures that the submarine cable is not excessively affected by torsional and overturning forces by setting multiple axially spaced metal rings and using a double mooring rope connection method. An elastic wear-resistant sleeve is also added inside the metal shell. Its tight compression can better fit the characteristics of the submarine cable surface and improve the clamping capacity. Finally, by setting metal blocks on the outer periphery of the metal shell, electrochemical corrosion protection is achieved for the clamp metal, thereby effectively extending the service life of the clamp.

[0015] Based on the above technical solution, the solution of this application can be further improved as follows:

[0016] Preferably, it includes:

[0017] The reinforcing member is movably sleeved on the submarine cable and located at the end of the metal shell, with the end furthest from the metal shell being frustoconical. This design reduces the curvature of the submarine cable at the clamp end, ensuring that the cable is not damaged by excessive bending while reducing fatigue effects on the cable.

[0018] Preferably, the metal shell is composed of multiple fan-shaped blocks assembled together, and the outer side of each fan-shaped block is provided with multiple arc-shaped grooves, which are used to assemble the annular groove. By adopting this solution, it is ensured that when facing submarine cables with slightly larger or smaller outer diameters, the adaptability of its own structure and the variability of the elastic wear-resistant sleeve can achieve a perfect fit with the submarine cable.

[0019] Preferably, the elastic wear-resistant sleeve is composed of multiple fan-shaped pieces spliced ​​together, and the fan-shaped pieces correspond one-to-one with the fan-shaped blocks. This design allows the elastic wear-resistant sleeve to be installed and disassembled in sections, which greatly simplifies the installation process and facilitates replacement or maintenance. Furthermore, by splicing the pieces together, it can better adapt to submarine cables of different diameters, thereby improving its versatility and practicality.

[0020] Preferably, the inner side of the fan-shaped block is provided with multiple grooves, and the outer side of the fan-shaped piece is provided with multiple protrusions. The protrusions correspond one-to-one with the grooves and are engaged and connected. By adopting this solution, the fan-shaped piece can be prevented from moving or falling off in the metal shell, thereby enhancing stability and making the fan-shaped piece easier to install and disassemble, improving the convenience of installation and the feasibility of maintenance.

[0021] Preferably, the metal ring comprises two semi-rings, and the two semi-rings are detachably connected; with this solution, the size of the metal ring can be adjusted by adjusting the tightness of the bolt and nut assembly, and its structure is simple and compact, and easy to assemble and disassemble, making it convenient for practical application.

[0022] Preferably, the cross-section of the semi-ring is concave, and the two ends of the semi-ring are provided with mating plates;

[0023] When the two semi-rings are joined together, the mating plates of the two semi-rings fit together and are connected by multiple bolt and nut assemblies. With this solution, the size of the metal ring can be adjusted by adjusting the tightness of the bolt and nut assemblies. Its structure is simple and compact, and it is easy to disassemble and assemble, easy to operate, and convenient for practical application.

[0024] Preferably, it further includes:

[0025] Multiple pairs of metal washers are installed one-to-one inside the ring groove, and each pair of metal washers is arranged on opposite sides of the metal ring. This solution restricts the axial movement of the metal ring, improves the stability of the metal ring installation, and also acts as an isolation layer to avoid direct contact between the metal ring and the metal shell, thereby reducing friction and wear and improving the smoothness of the metal ring rotation.

[0026] Preferably, the metal washer is formed by two metal semicircles joined together, and the two sides of the metal ring are provided with mounting grooves that are compatible with the metal washer. This solution facilitates the installation and removal of the metal washer and ensures its stability after installation, thereby making the entire structure more flexible, durable and reliable.

[0027] Preferably, the two ends of the sector block are provided with multiple connecting grooves, the bottom of the connecting grooves is parallel to the adjacent splicing surface, and a connecting hole is provided to realize the bolt connection between adjacent sector blocks; adopting this solution not only ensures the stable connection between adjacent sector blocks, but also adapts to the use of submarine cables of different specifications, and has a simple and compact structure, is easy to disassemble and assemble, and is convenient for practical application.

[0028] Through the above technical solution, this utility model achieves the following beneficial effects:

[0029] 1. This application ensures that the submarine cable is not excessively affected by torsional and overturning forces by setting multiple axially spaced metal rings and using a double mooring rope connection method. An elastic wear-resistant sleeve is also added inside the metal shell. Its tight compression can better fit the characteristics of the submarine cable surface and improve the clamping capacity of the clamp. Finally, by setting metal blocks on the outer periphery of the metal shell, the corrosion protection of the clamp metal is achieved by electrochemical means, thereby effectively extending the service life of the clamp.

[0030] 2. By incorporating reinforcing elements, this application can reduce the curvature of the submarine cable at the end of the clamp, ensuring that the cable is not damaged due to excessive bending while reducing the fatigue effect on the cable. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the mooring-type seabed anchoring clamp described in a specific embodiment of this application;

[0033] Figure 2 for Figure 1 A schematic diagram of the metal shell structure in the mooring-type seabed anchoring clamp shown;

[0034] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 This is a schematic diagram of the outer structure of the sector block described in a specific embodiment of this application;

[0036] Figure 5 for Figure 4 Side view of the sector shown;

[0037] Figure 6 This is a schematic diagram of the inner structure of the sector-shaped block according to a specific embodiment of this application;

[0038] Figure 7 for Figure 2 Schematic diagram of the structure of a medium-elasticity wear-resistant sleeve;

[0039] Figure 8 for Figure 1 Schematic diagram of the structure of the central metal ring;

[0040] Figure 9 for Figure 1 Schematic diagram of the middle reinforcing member;

[0041] Figure 10 for Figure 1 The diagram shows the usage status of the mooring-type seabed anchoring clamp.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Metal casing; 101. Annular groove; 11. Sector-shaped block; 111. Arc-shaped groove; 112. Groove; 113. Connecting groove; 114. Connecting hole;

[0044] 2. Elastic wear-resistant sleeve; 21. Fan-shaped piece; 211. Raised strip;

[0045] 3. Metal ring; 301. Lifting lug; 302. Mounting groove; 31. Half ring; 311. Butt plate; 32. Bolt and nut assembly;

[0046] 4. Metal block;

[0047] 5. Reinforcing components;

[0048] 6. Metal washer; 61. Metal half-circle. Detailed Implementation

[0049] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0050] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of this utility model, such as the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are all derived from the normal orientation of the components in the mooring-type seabed anchoring clamp. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0054] Example:

[0055] like Figure 1 and Figure 2 As shown in the figure, this application discloses a mooring-type submarine anchoring clamp for fixing dynamic submarine cables. Its specific structure includes: a metal shell 1, an elastic wear-resistant sleeve 2, two metal rings 3 and multiple metal blocks 4.

[0056] The metal housing 1 serves as the main structure of the clamp, and is in the shape of a hollow cylinder with two axially spaced annular grooves 101 on its outer periphery.

[0057] The elastic wear-resistant sleeve 2 is installed inside the metal shell 1 and sleeved on the submarine cable. It is preferably made of wear-resistant and corrosion-resistant rubber material, which can avoid seawater corrosion to a certain extent, but it is not limited to this and can also be made of other materials without specific limitations.

[0058] Two metal rings 3 are rotatably sleeved on the outside of the metal shell 1 and are locked into the ring grooves 101 one by one, and can rotate freely around the metal shell 1; and each metal ring 3 has a lifting lug 301 at both ends.

[0059] Multiple metal blocks 4 are spaced apart on the outer periphery of the metal shell 1, and their activity is greater than that of the metal shell 1 and the metal ring 3.

[0060] For example, the metal shell 1 and the metal ring 3 may be made of stainless steel, and the metal block 4 may be made of zinc alloy or aluminum alloy, but are not limited thereto and are not specifically limited thereto.

[0061] The above technical solution is used as follows:

[0062] When fixed, such as Figure 10 As shown, a double mooring rope is arranged on each side of the metal shell 1. One end of the double mooring rope is connected to the gravity base on the seabed, and the other end is Y-shaped and connected to the adjacent lug 301 on a metal ring 3. The nodes of the Y-shaped structure are slidable to allow the rope to slide on it. This prevents stress from accumulating at the knot when the submarine cable is slightly raised or lowered, and also releases the torque accumulated on the submarine cable itself. At the same time, it can restrain the submarine cable from overturning to a certain extent and prevent the submarine cable from concentrating all the force in one place when it receives the overturning force.

[0063] When in use, because the metal block 4 has high activity, the metal material of the fixture itself can be protected by the cathodic protection method of sacrificial anode material, thereby extending its service life.

[0064] When fixed, the elastic wear-resistant sleeve 2 will deform under force, thus fully fitting with the outer sheath of the submarine cable. This abandons the method of direct contact between the rigid structure and the surface of the submarine cable, and adopts a flexible structure for contact. This prevents the clamping failure caused by long-term seawater corrosion of the metal, and significantly expands the contact area, increases the friction between the two, and better plays the role of clamping and fixing. At the same time, its wear resistance extends the service life of the clamp.

[0065] This invention uses multiple axially spaced metal rings 3 and a double mooring rope connection method to ensure that the submarine cable is not excessively affected by torsional and overturning forces. An elastic wear-resistant sleeve 2 is also added inside the metal shell 1. Its tight compression can better fit the characteristics of the submarine cable surface and improve the clamping capacity. Finally, by setting metal blocks 4 on the outer periphery of the metal shell 1, electrochemical corrosion prevention is achieved for the clamp metal, thereby effectively extending the service life of the clamp.

[0066] In some embodiments, such as Figure 1 and Figure 9 As shown, it also includes: a reinforcing member 5, which is movably sleeved on the submarine cable and located at the end of the metal shell 1, with the end away from the metal shell 1 being frustoconical.

[0067] For example, the reinforcing member 5 is bolted to the end of the metal housing 1 via a flange ring, which makes the connection secure and easy to install and remove; there are two reinforcing members 5, which are respectively located at both ends of the metal housing 1, and they serve to protect both ends.

[0068] It should be noted that in the underwater environment, water currents may impact the clamps, so its frustum-shaped design helps to disperse and reduce this impact force, protecting the clamps and submarine cables from damage.

[0069] Understandably, the submarine cable is completely fixed in the clamp section, so the sudden loss of restraint at both ends will significantly increase the curvature of the submarine cable; in addition, the clamps installed on the submarine cable are restrained by the mooring rope, which will also increase the bending of the submarine cable at both ends of the clamp.

[0070] Therefore, by setting the aforementioned reinforcing member 5, the curvature of the submarine cable at the end of the clamp can be reduced, ensuring that the submarine cable will not be damaged due to excessive bending while reducing the fatigue effect of the submarine cable.

[0071] In some embodiments, such as Figure 2 and Figure 4 As shown, the metal shell 1 is composed of multiple sector blocks 11 assembled together. Multiple arc grooves 111 are provided on the outer side of the sector blocks 11, and the arc grooves 111 are used to assemble to form an annular groove 101.

[0072] For example, the metal housing 1 is composed of four sector blocks 11 joined together, and the sector blocks 11 are provided with two arc-shaped grooves 111 on the outside. Its four-petal structure makes the installation, maintenance and disassembly process more convenient; but it is not limited to this, and there may be other numbers, without specific limitation.

[0073] Preferably, the steel structure at both ends of each sector block 11 is slightly cut off at a 90° angle to ensure better adaptation to submarine cables of different specifications.

[0074] It should be noted that with the current Haver clamp, when the outer diameter of the submarine cable is slightly small, the clamp cannot fully fit the surface of the cable, thus reducing the contact area and the load-bearing capacity. When the outer diameter of the submarine cable is slightly large, the clamp cannot fully fit the cable, which also reduces the load-bearing capacity of the clamp.

[0075] Therefore, through the design of multiple fan-shaped blocks 11 being assembled together, and in conjunction with the elastic wear-resistant sleeve 2 set on the inner surface, it is ensured that when facing submarine cables with slightly larger or smaller outer diameters, the adaptability of its own structure and the variability of the elastic wear-resistant sleeve 2 can achieve a perfect fit with the submarine cable.

[0076] Based on the above embodiments, such as Figure 7 As shown, the elastic wear-resistant sleeve 2 is composed of multiple fan-shaped pieces 21 spliced ​​together, and the fan-shaped pieces 21 correspond one-to-one with the fan-shaped blocks 11.

[0077] The design of the aforementioned fan-shaped piece 21 allows the elastic wear-resistant sleeve 2 to be installed and disassembled in sections, which greatly simplifies the installation process and facilitates replacement or maintenance. Furthermore, by combining the pieces, it can better adapt to submarine cables of different diameters, thereby improving its versatility and practicality.

[0078] In this embodiment, as Figure 6 and Figure 7 As shown, the inner side of the fan-shaped block 11 is provided with multiple grooves 112, and the outer side of the fan-shaped piece 21 is provided with multiple protrusions 211. The protrusions 211 correspond one-to-one with the grooves 112 and are engaged and connected.

[0079] The interlocking design of the groove 112 and the protrusion 211 prevents the fan-shaped piece 21 from moving or falling off inside the metal housing 1, thereby enhancing stability and making it easier to install and remove the fan-shaped piece 21, improving the convenience of installation and the feasibility of maintenance.

[0080] In this embodiment, as Figure 8 As shown, the metal ring 3 includes two semi-rings 31, and the two semi-rings 31 are detachably connected.

[0081] The design of the semi-ring 31 makes the installation and disassembly of the metal ring 3 more flexible and convenient. The size of the metal ring 3 can be adjusted according to the actual size of the metal shell 1, so that the metal ring 3 can be used for various specifications of submarine cables, thus improving its versatility and practicality.

[0082] For example, such as Figure 8 As shown, the cross-section of the semi-ring 31 is concave, and the two ends of the semi-ring 31 are provided with mating plates 311; when the two semi-rings 31 are spliced ​​together, the mating plates 311 of the two semi-rings 31 fit together and are connected by multiple bolt and nut assemblies 32.

[0083] With the above settings, the size of the metal ring 3 can be adjusted by adjusting the tightness of the bolt and nut assembly 32. Its structure is simple and compact, and it is easy to disassemble and assemble, easy to operate, and convenient for practical application.

[0084] In this embodiment, as Figure 3 As shown, it also includes: multiple pairs of metal washers 6, which are installed one-to-one inside the annular groove 101, and each pair of metal washers 6 is arranged on opposite sides of the metal ring 3.

[0085] By setting the metal ring 3, the axial movement of the metal ring 3 is restricted, the stability of the installation of the metal ring 3 is improved, and it also acts as an isolation layer to avoid direct contact between the metal ring 3 and the metal shell 1, thereby reducing friction and wear and improving the smoothness of the rotation of the metal ring 3.

[0086] In this embodiment, as Figure 3 As shown, the metal washer 6 is composed of two metal semicircles 61 joined together, which makes the installation or disassembly process easier, thereby improving the assembly efficiency of the fixture, and does not require the entire ring to be replaced during replacement or maintenance, thus reducing material waste and costs.

[0087] The metal ring 3 has mounting grooves 302 on both sides that are compatible with the metal washer 6. This enhances the stability of the entire structure and provides limiting support for the metal half-ring 61, thereby preventing the two metal half-rings 61 from falling out of the ring groove 101.

[0088] The above-mentioned design facilitates the installation and removal of the metal washer 6 and ensures its stability after installation, thereby making the entire structure more flexible, durable and reliable.

[0089] In this embodiment, as Figure 4 and Figure 5 As shown, multiple connecting grooves 113 are provided at both ends of the sector block 11. The bottom of the connecting groove 113 is parallel to the adjacent mating surface and is provided with connecting holes 114 for bolt connection between adjacent sector blocks 11.

[0090] For example, such as Figure 4 As shown, the connecting grooves 113 are divided into two groups and arranged on both sides of the two metal rings 3; each group of connecting grooves 113 is divided into two units and is close to the two mating surfaces respectively; each unit has three connecting grooves 113 and they are evenly spaced along the axial direction; this ensures a stable connection between adjacent sector blocks 11.

[0091] During installation, align the multiple sector blocks 11, and then use the connecting grooves 113 and connecting holes 114 on their outer sides to position and tighten them with bolts. Finally, adjust the tightness of the bolts according to the actual size of the submarine cable.

[0092] The above configuration ensures a stable connection between adjacent sector blocks 11, adapts to the use of submarine cables of different specifications, and features a simple and compact structure that is easy to assemble and disassemble, making it convenient for practical applications.

[0093] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A mooring type subsea anchoring clamp, characterized in that, The utility model relates to a kind of metal shell and metal ring, including: Metal shell, outer periphery has two axial interval settings ring groove; Elastic wear sleeve, installation is in the metal shell, and sleeve is set on submarine cable; Two metal rings, rotation sleeve is set outside the metal shell, and is correspondingly engaged in the ring groove one by one;And the two ends of each metal ring are provided with lifting lug; Multiple metal blocks, interval installation is in the outer periphery of the metal shell, and activity is greater than the activity of the metal shell and the metal ring.

2. A mooring type seabed anchor clamp according to claim 1, characterised in that, Including: Reinforcing piece, activity sleeve is set on submarine cable, and it is set in the end of the metal shell, and the end away from the metal shell is circular truncated cone type.

3. The mooring subsea anchor clamp of claim 1, wherein, The metal shell is mutually spliced by multiple sector blocks, the outer side of the sector block is equipped with multiple arc grooves, and the arc grooves are used to splice to form the ring groove.

4. A mooring sea bed anchor clamp according to claim 3, characterised in that, The elastic wear sleeve is mutually spliced by multiple sector pieces, and the sector piece corresponds to the sector block one by one.

5. A mooring type seabed anchor clamp according to claim 4, characterised in that, The inner side of the sector block is equipped with multiple grooves, the outer side of the sector piece is equipped with multiple convex strips, the convex strip corresponds to the groove one by one and is connected.

6. The mooring subsea anchor clamp of claim 3, wherein, The metal ring includes two half rings, and two half rings are detachably connected.

7. A mooring sea bed anchor clamp according to claim 6, characterised in that, The cross section of the half ring is concave, and the two ends of the half ring are equipped with butt plate; When two half rings splice each other, the butt plate of two half rings is mutually pasted, and is connected by multiple bolt nut assemblies.

8. A mooring type seabed anchor clamp according to claim 7, characterised in that, Also including: Multiple pairs of metal washers, one by one installation is in the ring groove inside, and each pair of metal washers is configured on the opposite side of the metal ring.

9. A mooring type seabed anchor clamp according to claim 8, characterised in that, The metal washer is mutually spliced by two metal half rings, and the two sides of the metal ring are provided with installation slot adapted to the metal washer.

10. The mooring subsea anchor clamp of claim 3, wherein, Multiple connection grooves are opened in the two ends of the sector block, the groove bottom of the connection groove is parallel to adjacent splicing surface, and is provided with connecting hole, for realizing bolt connection between adjacent sector blocks.

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