Distributed gravity anchor foundation suitable for tension leg type HDPE net cage

Abstract

The utility model discloses a distributed gravity anchor foundation suitable for a tension leg type HDPE (high-density polyethylene) net cage, which comprises a circular ring outer shell, a circular ring inner shell, a plurality of inter-shell rib plates, a cement anchor, an anchor chain, a bottom plate and sandstone, the circular ring inner shell and the circular ring outer shell are concentrically arranged and are connected through the plurality of inter-shell rib plates, and the cement anchor, the anchor chain, the bottom plate and the sandstone are arranged in the circular ring outer shell. A cavity is formed between every two adjacent inter-shell rib plates, each cavity is internally provided with a cement anchor and filled with gravel, the top of each cement anchor is connected with an anchor chain, the cement anchors are connected with a net cage above the cement anchors through the anchor chains, a bottom plate is arranged at the bottom of the annular inner shell, and an empty bin defined by the annular inner shell and the bottom plate is filled with gravel. The utility model can effectively avoid the problems of foundation inclination, damage and the like caused by seabed scouring, improve the structural stability and the service life of the net cage in sea areas with large seabed flow velocity and easy surface soil scouring, save the sea occupation area of a single net cage, and promote the progress of deep and far sea marine ranch construction.

Description

Technical Field

[0001] The utility model relates to the technical field of tension-leg HDPE cages, in particular to a distributed gravity anchor foundation applicable to tension-leg HDPE cages. Background Technique

[0002] At present, floating cages are often the preferred equipment for deep-sea aquaculture. In order to maintain the stability of the cages in strong winds and high waves, the mooring system is one of the key contents in the overall design of the cages. The functions of different mooring foundations are limited by the seabed geological conditions and water depth, thus determining the manufacturing and installation costs of the anchor foundation. Obviously, this cost also accounts for a relatively high proportion in the mooring system cost. The gravity anchor is one of the most widely used anchor foundations at present and can be used in a variety of geological conditions, with a relatively wider application range compared to other types of anchors. Although the gravity anchor foundation has good economy and applicability under the geological condition of fine sand in the surface soil, for a relatively large-diameter gravity anchor foundation, problems such as local scour leading to the foundation slipping and tilting still occur. At the same time, at present, floating cages mainly adopt the catenary mooring method. This mooring system usually needs to radiate within a range of about 200 - 300 meters near the cage, which results in a small number of cages that can be arranged in a limited aquaculture sea area and it is difficult to meet the requirements of the development of the marine economy.

[0003] Therefore, for deep-sea aquaculture, it is also necessary to consider factors such as the influence of seabed scour of the gravity anchor foundation and the sea area utilization rate. In view of these problems, it is necessary to further study and improve the design of the gravity anchor to improve the safety and stability of the cages during the aquaculture process. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a distributed gravity anchor foundation applicable to tension-leg HDPE cages, which can effectively avoid problems such as foundation tilt and damage caused by seabed scour, improve the structural stability and service life of the cages in sea areas with large seabed flow velocity and easy scouring of the surface soil, can save the sea area occupied by a single cage, and promote the progress of the construction of deep-sea marine pastures.

[0005] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] A decentralized gravity anchor foundation applicable to a tension leg type HDPE cage, comprising a circular ring outer shell, a circular ring inner shell, a plurality of inter-shell rib plates, a cement anchor, an anchor chain, a bottom plate and sand and gravel. The circular ring inner shell and the circular ring outer shell are concentrically arranged, and the circular ring inner shell and the circular ring outer shell are connected by a plurality of inter-shell rib plates. Cavities are formed between two adjacent inter-shell rib plates. A cement anchor is installed in each cavity and filled with sand and gravel. The top of each cement anchor is connected with an anchor chain. The cement anchor is connected to the upper cage through the anchor chain. The bottom of the circular ring inner shell is provided with a bottom plate, and the empty bin formed by the circular ring inner shell and the bottom plate is filled with sand and gravel.

[0007] Further, the top and bottom of the bottom plate are both provided with criss-cross rib plates.

[0008] Further, the cement anchor comprises a cement block and an anchor ring arranged at the top of the cement block.

[0009] Further, the cement block is made of reinforced concrete, and the anchor ring is made of steel.

[0010] Further, the inter-shell rib plates are arranged along the radial direction of the circular ring outer shell.

[0011] Further, the anchor chain is made of polypropylene.

[0012] Further, the circular ring outer shell, the circular ring inner shell, the inter-shell rib plates, the bottom plate and the rib plates arranged at the top and bottom of the bottom plate are integrally cast with reinforced concrete.

[0013] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0014] 1. The utility model combines two foundation types of beam-slab gravity anchor and cement anchor, which can reflect the advantages of cost reduction and weight reduction, and can overcome the influence of difficult offshore transportation caused by the excessive weight of a single gravity anchor foundation.

[0015] 2. In the utility model, the anchor points are located in the cement anchor structure. The anchor point design is simple, the structure is reliable, the maintenance is convenient, and the anchor points are arranged in a decentralized manner, which is suitable for anchoring HDPE tension leg type aquaculture cages.

[0016] 3. In the utility model, through the innovative transformation of the traditional gravity anchor, the integrity and stability of the foundation after seabed scouring can be effectively guaranteed, and the problem of foundation inclination failure caused by scouring can be ensured. Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of the decentralized gravity anchor foundation of the utility model Figure 1 .

[0018] Figure 2Structural schematic of the distributed gravity anchor foundation of the present utility model Figure 2 。

[0019] Figure 3 Top view after installation of the distributed gravity anchor foundation of the present utility model.

[0020] Figure 4 Side view after installation of the distributed gravity anchor foundation of the present utility model.

[0021] Figure 5 Structural schematic of the cement anchor of the present utility model. Specific implementation mode

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0023] Embodiment 1:

[0024] As Figures 1 to 5 shown, this embodiment provides a distributed gravity anchor foundation applicable to a tension leg type HDPE cage, including a circular ring outer shell 1, a circular ring inner shell 2, a plurality of inter-shell rib plates 3, a cement anchor 4, an anchor chain 5, a bottom plate 8 and gravel 11. The circular ring inner shell 2 and the circular ring outer shell 1 are concentrically arranged, and the circular ring inner shell 2 and the circular ring outer shell 1 are connected by a plurality of radially arranged inter-shell rib plates 3. A cavity is formed between two adjacent inter-shell rib plates 3. A cement anchor 4 is installed in each cavity and filled with gravel 11. The top of each cement anchor 4 is connected to an anchor chain 5. The cement anchor 4 is connected to the upper cage through the anchor chain 5. The bottom of the circular ring inner shell 2 is provided with a bottom plate 8, and the empty space enclosed by the circular ring inner shell 2 and the bottom plate 8 is filled with gravel 11.

[0025] Specifically, the top and bottom of the bottom plate 8 are provided with criss-cross rib plates, namely a top transverse rib plate 6, a top longitudinal rib plate 7, a bottom transverse rib plate 9 and a bottom longitudinal rib plate 10.

[0026] In this embodiment, the circular ring outer shell 1, the circular ring inner shell 2, the inter-shell rib plates 3, the bottom plate 8 and each rib plate are integrally cast with reinforced concrete.

[0027] Specifically, the cement anchor 4 includes a cement block 401 and an anchor ring 402 provided on the top of the cement block 401. Further, the cement block is made of reinforced concrete, and the anchor ring is made of steel. The anchor chain 5 is made of polypropylene. During the construction process, the anchor chain 5 is pre-tied to the anchor ring, and the anchor chain 5 will be lowered together with the cement anchor 4 to the designated position. Subsequently, the upper end of the anchor chain 5 is connected to the upper HDPE tension leg type aquaculture cage, and the length of each section of the anchor chain 5 is adjusted to ensure the stability of the cage.

[0028] The installation and use method of the decentralized gravity anchor foundation in this embodiment are as follows:

[0029] 1. Prefabricate the beam-slab gravity anchor structure part and the cement anchor of the decentralized gravity anchor foundation on land: Build the foundation formwork, tie the steel bars and pour the concrete on-site in the shore-side wharf factory. After the concrete curing is completed, the foundation is ready for transportation and installation.

[0030] 2. Float and tow the beam-slab gravity anchor structure part as a whole: Arrange an appropriate number of airbags around the beam-slab gravity anchor structure part to ensure that the buoyancy and stability requirements of the anchor foundation under the towing condition are met, thereby maintaining the overall structural stability and structural strength.

[0031] 3. Ship-borne transportation of the cement anchor: The cement anchor is carried by a transport ship and towed to the construction position of the anchor point.

[0032] 4. Positioning and installation: After reaching the anchor point position, slowly lower the beam-slab gravity anchor structure part to the seabed that has been treated by the foundation, ensuring that the grid insert plate composed of the bottom transverse rib plate and the bottom longitudinal rib plate sinks below the mud surface, thereby increasing the horizontal soil resistance. After the installation of the beam-slab gravity anchor structure part is completed, connect the cement anchor to the corresponding anchor chain and slowly lower it into the cavity surrounded by the circular ring outer shell, the circular ring inner shell and the rib plates between the shells.

[0033] 5. The construction ship throws sand and gravel at sea: After the stone-throwing ship arrives at the position, throw sand and gravel into the empty bin surrounded by the bottom plate and the circular ring inner shell, and throw sand and gravel into the cavity surrounded by the circular ring outer shell, the circular ring inner shell and the rib plates between the shells.

[0034] 6. Installation of the mooring system: There is an anchor ring on the cement anchor, which will be connected to the upper floating cage through the anchor chain to meet the anchoring form requirements of the tension leg type HDPE cage.

[0035] 7. Monitoring of the equipment and maintenance after scouring: After the equipment has been running for a period of time, it is necessary to monitor the scouring situation around the decentralized gravity anchor foundation. If serious scouring occurs, the stone-throwing ship can be arranged to go to the anchor point position and throw sand and gravel into the cavity surrounded by the circular ring outer shell, the circular ring inner shell and the rib plates between the shells to ensure the structural safety.

[0036] As mentioned above, it is only a preferred embodiment of the utility model patent. However, the protection scope of the utility model patent is not limited thereto. Any person skilled in the art within the scope disclosed by the utility model patent, according to the technical solution of the utility model patent and its inventive concept, makes equivalent substitutions or changes, which all belong to the protection scope of the utility model patent.

Claims

1. A distributed gravity anchor foundation applicable to a tension leg type HDPE fish cage, characterized in that: It includes a circular ring outer shell, a circular ring inner shell, multiple inter-shell rib plates, cement anchors, anchor chains, a bottom plate and sand and gravel. The circular ring inner shell and the circular ring outer shell are concentrically arranged, and the circular ring inner shell and the circular ring outer shell are connected by multiple inter-shell rib plates. Cavities are formed between two adjacent inter-shell rib plates. A cement anchor is installed in each cavity and filled with sand and gravel. The top of each cement anchor is connected to an anchor chain. The cement anchor is connected to the net cage above through the anchor chain. The bottom of the circular ring inner shell is provided with a bottom plate, and the empty space enclosed by the circular ring inner shell and the bottom plate is filled with sand and gravel.

2. The decentralized gravity anchor foundation applicable to the tension-leg type HDPE cage according to claim 1, characterized in that: Both the top and the bottom of the bottom plate are provided with criss-cross rib plates.

3. The decentralized gravity anchor foundation applicable to the tension leg type HDPE net cage according to claim 1, characterized in that: The cement anchor includes a cement block and an anchor ring arranged at the top of the cement block.

4. The decentralized gravity anchor foundation applicable to the tension-leg type HDPE cage according to claim 3, wherein: The cement block is made of reinforced concrete, and the anchor ring is made of steel.

5. The decentralized gravity anchor foundation applicable to the tension-leg type HDPE cage according to claim 1, characterized in that: The inter-shell rib plates are arranged along the radial direction of the circular ring outer shell.

6. The decentralized gravity anchor foundation applicable to the tension leg type HDPE fish cage according to claim 1, characterized in that: The anchor chain is made of polypropylene.

7. The decentralized gravity anchor foundation applicable to the tension-leg type HDPE cage according to claim 1, characterized in that: The circular ring outer shell, the circular ring inner shell, the inter-shell rib plates, the bottom plate and the rib plates arranged at the top and the bottom of the bottom plate are integrally cast with reinforced concrete.

Images