CN105926531B - A kind of case net type floating breakwater based on FRP material - Google Patents

Abstract

The invention provides a box net type floating breakwater based on FRP material. It includes a pontoon, a grid connected under the pontoon, and anchor chains and anchor spindles. The pontoon is composed of a vertical rectangular concrete pontoon girder and a horizontal and vertical rectangular concrete pontoon girder. The vertical and horizontal rectangular concrete pontoon beams are made of concrete Prefabricated as a whole, the vertical and horizontal rectangular concrete pontoon girders are distributed in the shape of a "well" beam structure, FRP grids are set under the vertical and horizontal rectangular concrete pontoon box girders, and each FRP grid is connected to form a grid Cage structure. The invention is a box net type floating breakwater which has the functions of reflection, dissipation and wave breaking and wave dissipation. It is suitable for offshore waters with open surroundings, little wave effect, and uncertain wave direction. It can provide effective cover for aquaculture, artificial beaches, yacht docks and other places, and has broad practical prospects.

Description

A box-net type floating breakwater based on FRP material

technical field

The invention relates to a breakwater. Specifically, a floating breakwater.

Background technique

Breakwater is a common coastal engineering structure, mainly used to protect coastal engineering structures and ships in the harbor. The bottom of traditional breakwaters is fixed, and as ocean development gradually extends to the deep sea, problems such as high construction costs and construction difficulties of traditional breakwaters have become increasingly prominent. Therefore, floating breakwaters become one of the key technologies in port construction projects.

Floating Breakwater (FB) is an important type of breakwater structure in marine engineering. It is usually composed of wave-absorbing buoys and mooring systems made of metal, reinforced concrete and plastic materials. The wave-suppressing floating body is composed of a box or a floating row with a certain draft. The box body and the floating row are connected with an anchor chain fixed at the bottom of the sea to float on the water surface. Floating breakwaters use wave-dissipating buoys at a certain water depth to reflect, dissipate, and break wave energy to achieve wave dissipation and wave prevention. Main advantages: 1) Low-cost construction, not affected by the geological conditions and water depth of the seabed; 2) Convenient transportation, rapid construction, and easy demolition, especially for temporary breakwaters; 3) The cost is less affected by the water depth; 4) Under the structure It can carry out water circulation, biological exchange, and sediment flow, and has ecological advantages.

Fiber reinforced polymer/plastic (FRP) is a high-performance new material formed by mixing fiber material and matrix material in a certain proportion and compounding through a certain process. FRP has been applied in civil and architectural engineering structures due to its advantages of high strength, light weight and corrosion resistance.

The experience of Europe and the United States shows that the pontoon breakwaters made of plastic pontoons are easy to be damaged due to the strength and aging of materials, and the use of concrete pontoon structures should be given priority. In my country, resources such as wood, steel, and waste automobile tires are insufficient, and concrete has become the main building material in our country.

However, whether the floating breakwater structure is made of reinforced concrete or steel, it works in a high-temperature, high-humidity, high-salt marine environment. The problem of severe corrosion of steel is very prominent, and maintenance is difficult, which reduces the service life of the floating breakwater. The box-net type floating breakwater made of FRP material adopts FRP ribs and FRP grid material, which has strong corrosion resistance in the marine environment, does not require long-term maintenance, is light in weight, high in strength, and is convenient for transportation and prefabrication. Enables quick installation and recycling.

In the article "Experimental Research on Wave Dissipation Performance of Plate-Mesh Structure Floating Breakwater" ("Engineering Mechanics" July 2006), a plate-mesh floating dike structure is proposed. The test results show that the dike width has an effect on wave dissipation performance Significantly, the greater the embankment width, the better the wave dissipation effect. Adding a net to the lower part of the slab can improve the wave dissipation performance of the floating embankment, and enhancing the rigidity of the slab can obviously improve the wave dissipation effect of the levee.

In the master's thesis "A Floating Breakwater with Mesh Cage Structure", a floating breakwater with a mesh cage structure is introduced, which can not only reduce the risk of hitting the sheltered structure after the breakwater is damaged, but also avoid the appearance of ordinary floating breakwaters. Hazardous situation where box breakwaters or buoy breakwaters become inoperable when water seeps through cracks in the external structure.

Contents of the invention

The object of the present invention is to provide a box-net type floating breakwater based on FRP material with good anti-corrosion effect and the functions of reflection, dissipation and breaking wave absorption.

The purpose of the present invention is achieved like this: comprise buoyancy box, the grid that is connected under the buoyancy box, and anchor chain and anchor spindle, described buoyancy box is made of vertical rectangular concrete buoyant girder, horizontal rectangular concrete buoyant girder, The vertical and horizontal rectangular concrete pontoon girders are prefabricated by concrete, and the vertical and horizontal rectangular concrete pontoon girders are distributed in the shape of a "well" beam structure. FRP grids are set under the vertical and horizontal rectangular concrete pontoon box girders. Each FRP grid is connected to form a grid cage structure.

The present invention may also include:

1. FRP bars are arranged in the longitudinal rectangular concrete pontoon box girder and the horizontal rectangular concrete pontoon box girder.

2. The FRP grid and the vertical and horizontal rectangular concrete floating box girders are cast into one body.

3. In the cage structure, each FRP grid is wound and connected by FRP cloth and resin glue.

In order to solve the technical problems existing in the existing floating breakwater technology, the present invention provides a FRP material-based breakwater with simple structure, high strength, saving engineering materials and anti-corrosion effect, which has the functions of reflection, dissipation and breaking wave absorption. Box type floating breakwater.

The technical solution of the present invention is a box-net type floating breakwater with the functions of reflection, dissipation and breaking and wave absorption. The buoyant box is composed of a plurality of FRP bars-concrete buoyant box girders, and the buoyant box is fixed by anchor chains and anchor spindles. At the bottom of the water, a mesh cage structure composed of FRP grid materials is provided under the pontoon to form a damping structure. The top view shows a "well"-shaped beam structure, which is poured together with the lower FRP grid material.

The floating breakwater adopts a buoyant box similar to a "well"-shaped beam-slab structure in the top view, which can increase wave energy reflection, and the cavity formed by each beam-type buoyant box and the cavity formed by each grid material can generate a certain amount of wave energy. At the same time, the lower part of the pontoon is composed of grid material and the cage structure forms a damping structure in the lower part of the beam pontoon to break the waves, which can eliminate waves in different vibration directions and significantly improve the wave dissipation effect.

The buoyant tank of the floating breakwater is prefabricated with FRP reinforced concrete, and the lower damping structure is made of FRP grid material to form a cage structure. The buoyant tank and the grid material are poured together, and the grid unit is wound by FRP cloth and resin glue The connection enhances the integrity and stability of the floating breakwater, while the FRP is high-strength, light, and corrosion-resistant, which increases the service life of the floating breakwater.

The invention has a simple structure, and the FRP material is corrosion-resistant and has high strength, which can save engineering materials; the dead weight is light, and the design requirements for the mooring system are reduced; At the same time, the use of reinforced concrete prefabrication and the use of FRP solve the problem of corrosion of floating breakwaters in harsh marine environments, making construction and maintenance more convenient. The box-net type floating breakwater made of FRP material adopts FRP ribs and FRP grid material, which has strong corrosion resistance in the marine environment, does not require long-term maintenance, is light in weight, high in strength, and is convenient for transportation and prefabrication. Enables quick installation and recycling. It is suitable for offshore waters with open surroundings, little wave action, and uncertain wave direction. It can provide effective cover for aquaculture, artificial beaches, yacht docks and other places, and has broad practical prospects.

Description of drawings

Figure 1 is a schematic diagram of the structure (top view).

Fig. 2 is an I-I sectional view of Fig. 1 .

FIG. 3 is a side view of FIG. 1 .

Figure 4 is a schematic diagram of the FRP grid;

Fig. 5 is a schematic diagram of a grid cage structure formed by connecting FRP grids.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments.

Referring to Figs. 1 to 5, the present invention is a box net type floating breakwater based on FRP material, including a buoyant box, a grid connected under the buoyant box, and anchor chains 5 and anchor bars 6 . The pontoon is composed of a vertical rectangular concrete pontoon girder 2 and a horizontal rectangular concrete pontoon girder 1. The vertical and horizontal rectangular concrete pontoon girders are prefabricated by concrete. FRP grids 4 and 3 are arranged under the rectangular concrete pontoon girder and the horizontal rectangular concrete pontoon girder, and each FRP grid is connected to form a grid cage structure. FRP bars are arranged in the vertical and horizontal rectangular concrete pontoon box girders, and the FRP grid is cast into one body with the vertical and horizontal rectangular concrete pontoon box girders. In the cage structure, each FRP grid is wound and connected by FRP cloth and resin glue.

The cavity formed by the "well" shaped beam structure has the effect of dissipating wave energy. Combined with the good effect of reflecting wave energy of the rectangular pontoon structure itself, it can effectively improve the wave dissipation effect of the breakwater and reduce the wave height behind the embankment. The mesh cage structure composed of FRP grid material is set in the lower part of the beam-type pontoon to form a damping structure, and poured together with the upper pontoon. Each FRP grid unit is wound and connected by FRP cloth and resin glue to form a mesh cage structure.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection scope of the present invention.

Claims (2)

1. a kind of case net type floating breakwater based on FRP material, including buoyancy tank, the grid and anchor chain that are connected under buoyancy tank With anchor ingot, it is characterized in that：The buoyancy tank is made of vertical Rectangular Concrete buoyancy tank beam, horizontal Rectangular Concrete buoyancy tank beam, in length and breadth square Shape concrete buoyancy tank beam is by concrete prefabricated integral, and Rectangular Concrete buoyancy tank beam is in " well " tee beam structure distribution in length and breadth, FRP grids are respectively provided with below vertical Rectangular Concrete buoyancy tank beam and horizontal Rectangular Concrete buoyancy tank beam, each FRP grids connect and compose grid Grid basket structure, FRP grids and the casting of Rectangular Concrete buoyancy tank beam in length and breadth are integral, each FRP grids in the wire mesh cage structures It is intertwined and connected by FRP cloth and resin glue.

2. the case net type floating breakwater according to claim 1 based on FRP material, it is characterized in that：Vertical Rectangular Concrete FRP tendons are laid in buoyancy tank beam and horizontal Rectangular Concrete buoyancy tank beam.