CN202148535U - Concrete gravity type foundation suitable for ocean engineering - Google Patents

Abstract

The utility model discloses a concrete gravity foundation suitable for marine engineering. In order to solve the problems of difficult construction work and high transportation and installation costs of existing concrete gravity foundations, the utility model includes concrete gravity foundation pedestals, foundation trays and guide pipes; grouting pipes are arranged inside the guide pipes, and the outer wall is opened There are multiple grouting holes communicating with the grouting pipe. The utility model has the advantages of simple structure and convenient installation; the requirement of natural bearing capacity can be met by adjusting the size of the base tray; and the installation cost can be effectively reduced by using the overall haulage on water. The utility model is suitable for sea areas with relatively large water depths, can be used as the foundation of towers of wind power generating sets, towers of tidal current generating sets, etc., and is especially suitable for soft soil foundations.

Description

A Concrete Gravity Foundation Suitable for Ocean Engineering

technical field

The utility model relates to an ocean engineering infrastructure, in particular to a concrete gravity foundation suitable for ocean engineering. The utility model is suitable for sea areas with relatively large water depths, can be used as the foundation of towers of wind power generating sets, towers of tidal current generating sets, etc., and is especially suitable for soft soil foundations.

Background technique

The foundation structure types of marine engineering mainly include: single pile foundation, concrete gravity foundation, suction foundation, multi-pile foundation and floating foundation. Offshore oil drilling platforms mostly use multi-pile foundations, and offshore wind turbines mostly use single-pile steel structure foundations and concrete gravity foundations. At present, the concrete gravity foundation type commonly used in China is widely used in marine projects such as ports and wharves because of its huge weight to maintain the stability of structures, simple structure and good stability.

Correspondingly, due to the huge weight of the concrete gravity foundation pedestal, the bearing capacity of the natural soft soil foundation is difficult to meet the requirements, and it is usually necessary to riprap the seabed to improve the bearing capacity of the seabed foundation. When the water depth is large, it is difficult to implement construction operations such as dredging operations on the seabed, foundation trench excavation, dumping and filling of rocks, and layered compaction. The huge foundation weight also greatly increases the transportation and installation costs.

Utility model content

Aiming at the defects that the existing concrete gravity foundation is difficult to construct and the cost of transportation and installation is high, the utility model aims to provide a concrete gravity foundation suitable for ocean engineering. The concrete gravity foundation has a simple structure and is easy to install, and utilizes the characteristics that the area of the foundation tray is larger than the area of the concrete gravity foundation pedestal. The overall haulage on water can effectively reduce the installation cost.

In order to achieve the above purpose, the technical solution adopted by the utility model is: the concrete gravity foundation suitable for marine engineering includes a concrete gravity foundation pedestal, and its structural feature is that it also includes a foundation tray and a guide pipe; the foundation tray Located under the concrete gravity foundation pedestal and connected to the bottom plate of the concrete gravity foundation pedestal, and the bottom area of the foundation tray is larger than the bottom area of the concrete gravity foundation pedestal; the guide tube is installed on the concrete gravity foundation pedestal, the guide A grouting pipe is arranged inside the pipe, and a plurality of grouting holes communicating with the grouting pipe are opened on the outer wall of the guide pipe.

As a further improvement to the utility model:

In order to ensure that the tower can be accurately positioned on the concrete gravity foundation pedestal, the top surface of the concrete gravity foundation pedestal is provided with a tower sleeve ring located outside the guide pipe, and the bottom edge of the tower tube is placed on the tower sleeve In the ring, the height of the guide pipe is greater than the water depth of the installation site.

In order to realize the grouting construction between the guide tube and the tower tube, in order to increase the rigidity of the tower tube structure, it is necessary to improve the circumferential sealing effect between the bottom edge of the tower tube and the top surface of the concrete gravity foundation pedestal. Water-stop gaskets are arranged between the collars.

In order to adjust the verticality of the tower, the outer diameter of the upper part of the guide pipe is smaller than the outer diameter of the lower part.

In order to better maintain the balance of the concrete gravity foundation during transportation and installation, balance weights and flat pressing holes are arranged inside the foundation pallet.

The installation method of the concrete gravity foundation suitable for marine engineering includes the following steps:

1) Concrete gravity foundation pedestals, guide pipes and accessories are made on the foundation pallets floating and anchored at sea;

2) Transport the above-mentioned concrete gravity foundation to the installation site as a whole, position it, and counterweight it to keep it in balance;

3) Inject water into the foundation tray to sink the concrete gravity foundation composed of the concrete gravity foundation pedestal, the foundation tray and the guide pipe.

Wherein the accessories include grouting pipes, tower collars, water-stop gaskets and the like.

Further, after the sinking of the concrete gravity foundation is completed, in order to obtain greater ballast for the foundation pallet, block stones are thrown into the foundation pallet.

The basic pallet is generally processed on land, and then the finished basic pallet is transported to the offshore sea and anchored.

Compared with the prior art, the utility model has the beneficial effects that: the concrete gravity foundation suitable for ocean engineering uses a base tray area larger than the concrete gravity foundation pedestal area, that is, the buoyancy generated by the foundation tray is greater than that of the concrete gravity foundation. The characteristics of self-weight, by increasing the area of the foundation tray, reduce the requirements of the concrete gravity foundation on the bearing capacity of natural soft soil foundation; use the buoyancy generated by the foundation tray to make the concrete gravity foundation float on the water surface as a whole, and achieve the purpose of overall hauling on the water , by injecting water into the foundation tray to make the foundation sink as a whole, thereby reducing the cost of transportation and installation; using the balance weight to adjust the overall center of gravity, and using the flat pressure hole to adjust the internal pressure of the unstable wake vortex, so that the concrete gravity foundation can be stably lowered Sinking, reduce the swing during the sinking process.

When the concrete gravity foundation is placed on the inclined seabed foundation, the vertical deflection correction of the tower can still be realized to a certain extent by utilizing the characteristic that the outer diameter of the upper part of the guide pipe is smaller than that of the lower part. The utility model is suitable for sea areas and soft soil foundations with relatively large water depths, and can be used as the foundation for towers of wind power generating sets, towers of tidal current generating sets, and the like.

Below in conjunction with accompanying drawing and embodiment the utility model is further elaborated.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a side view of the basic pallet described in the utility model;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a cross-sectional view of the guide tube of the present invention.

In the picture:

1- Concrete gravity foundation pedestal; 2- Guide pipe; 3- Grouting pipe;

4-grouting hole; 5-tower collar; 6-water stop washer;

7-Basic tray; 8-Balance counterweight; 9-Planning hole.

Detailed ways

As shown in Figures 1 to 2, the upper half of the concrete gravity foundation pedestal 1 is a circular truncated shape, and the lower half is a cylindrical shape, and its structural size should be determined according to the upper load and the seabed foundation conditions. The top surface of the concrete gravity foundation pedestal 1 is provided with a tower collar 5 and a water-stop washer 6 . The inner diameter of the tower sleeve ring 5 should be greater than the outer diameter of the tower (such as the tower of the wind power unit, the tower of the tidal current unit). When the foundation is placed on the seabed foundation with a larger inclination, the diameter of the tower collar 5 can be increased, and its diameter can be adjusted according to the inclination angle of the seabed foundation, the outer diameter of the tower, the height of the guide pipe 2 and The outer diameter and other dimensions of the upper and lower parts are calculated and obtained, so as to realize the vertical deviation correction of the tower. The water-stop gasket 6 matches the gasket at the bottom edge of the tower to form a ring seal between the inner side of the tower and the guide pipe 2, so that it has the conditions for draining the water body, so as to ensure the quality of concrete and grouting in the gap. The tower tube and the guide tube 2 are integrated to improve the rigidity of the tower tube structure.

As shown in Figures 3 to 4, the base tray 7 is connected to the bottom of the concrete gravity foundation pedestal 1 as a whole. The size of the base tray 7 is determined by the overall weight and the bearing capacity of the seabed foundation. Float on the water. Balance weights 8 and flat pressure holes 9 are evenly arranged inside the basic tray 7. The balance weights 8 are used to adjust the overall center of gravity to keep it balanced. The lower opening of the flat pressure hole 9 adopts a streamlined design. The upper caliber, when the concrete gravity foundation sinks, there is sufficient water flow through the pressure leveling hole 9, so as to reduce the unstable pressure inside the wake vortex and reduce the swinging during the sinking process.

As shown in Figure 5, the outer diameter of the upper part of the guide pipe 2 is smaller than the outer diameter of the lower part and is higher than the water surface. During the hoisting construction of the tower, the tower can be accurately positioned in the tower ring 5, and the bottom edge of the tower and the water-stop gasket 6 Forms a circumferential seal. The grouting pipe 3 is evenly arranged on the inner side of the guide pipe 2 , and the grouting hole 4 provided on the pipe wall of the guide pipe 2 is directly communicated with the grouting pipe 3 . When the grout is injected from the grouting pipe 3 , the grout enters the gap between the inside of the tower and the guide pipe 2 through the grouting hole 4 .

The installation method of the above-mentioned concrete gravity foundation suitable for ocean engineering specifically includes the following steps:

1) Process and manufacture the foundation pallet 7 on land, then transport the finished foundation pallet 7 to the offshore sea, and make a concrete gravity foundation platform 1 and guide on the foundation pallet 7 floating on the offshore sea and anchored Pipe 2, grouting pipe 3, tower collar 5, water stop gasket 6, etc.;

2) Drag the above-mentioned concrete gravity foundation to the installation site as a whole, position it, and counterweight it to keep it in balance;

3), injecting water into the foundation tray 7 to make the concrete gravity foundation composed of the concrete gravity foundation pedestal 1, the guide pipe 2 and the foundation tray 7 sink smoothly as a whole;

4), Throw and fill block stones into the foundation tray 7 to obtain greater ballast.

The above-mentioned embodiments should be understood that these embodiments are only used to illustrate the utility model more clearly, and are not intended to limit the scope of the utility model. After reading the utility model, those skilled in the art will understand each aspect of the utility model The modifications of all equivalent forms all fall within the scope defined by the appended claims of the present application.

Claims (6)

1. a concrete gravity formula basis that is applicable to ocean engineering comprises concrete gravity formula basis pedestal (1), it is characterized in that, also comprises basic pallet (7) and guide pipe (2); Said basic pallet (7) is positioned at concrete gravity formula basis pedestal (1) below and links to each other with the base plate of concrete gravity formula basis pedestal (1); And floor space that should basis pallet (7) is greater than the floor space of concrete gravity formula basis pedestal (1), and said guide pipe (2) is contained on the concrete gravity formula basis pedestal (1); Said guide pipe (2) internal placement has Grouting Pipe (3), and this guide pipe (2) outer wall offers the injected hole (4) that a plurality of and said Grouting Pipe (3) is communicated with.

2. the concrete gravity formula basis that is applicable to ocean engineering according to claim 1 is characterized in that the end face of described concrete gravity formula basis pedestal (1) is provided with the tower jacket casing ring (5) that is positioned at guide pipe (2) outside.

3. the concrete gravity formula basis that is applicable to ocean engineering according to claim 2 is characterized in that, is provided with sealing packing ring (6) between said guide pipe (2) and the tower jacket casing ring (5).

4. the concrete gravity formula basis that is applicable to ocean engineering according to claim 1; It is characterized in that; Described basic pallet (7) connects into integral body with the base plate of concrete gravity formula basis pedestal (1), and this basis pallet (7) internal placement has equilibrate counterweight (8) and concora crush hole (9).

5. the concrete gravity formula basis that is applicable to ocean engineering according to claim 4 is characterized in that the bottom bore in said concora crush hole (9) is greater than the top bore.

6. according to each described concrete gravity formula basis that is applicable to ocean engineering of claim 1～5; It is characterized in that; Described guide pipe (2) connects into integral body with the end face of concrete gravity formula basis pedestal (1); The top external diameter of guide pipe (2) is less than lower outer diameter, and the height of guide pipe (2) is greater than the depth of water of infield.

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