JPS5966825A - Underwater setting pillar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to supports installed underwater, particularly in the sea, and more specifically, to installation of marine fences such as oil fences, earth and sand fences, jellyfish fences, and fish culture nets on quay walls. It is related to the pillars used for support.

Recently, it has become mandatory to install oil fences on the coasts of industrial complexes to prevent the spread of oil into the ocean in the event of an oil spill, which has been shown to be effective in preventing marine pollution and maritime disasters. In addition, because jellyfish gather at the drains of thermal power plants, jellyfish fences are being installed to prevent jellyfish from entering the drains, and many places are also installing sand fences to prevent sand from flowing out. It's coming. Additionally, demand for fences to protect fish cages set up in nearby waters is increasing.

The metal fittings for supporting and fixing such underwater fences have been changed from being fixed at a single point to the quay wall to hollow column-shaped supports made of steel that take into consideration the sealing properties between the quay wall and the fence. The hollow parts of these pillars are equipped with floats that can be raised and lowered depending on the tidal water level, and by connecting fences to these floats, the fences are always suspended above the water surface, and the sealing between the fences and the quay prevents the effects of tidal levels. It is kept in good condition at all times without any damage.

Tensile tension is applied to fences due to tidal currents, ebbs and flows, etc., and in order to prevent the props from being damaged by this tension, the material of the props was steel, but these steel props had a diameter of 100 mm.
Since it has a diameter of 500 mm, a wall thickness of 2 to 20 mm, and a length of 1 to 10 m, the entire weight of the pillar is several hundred kg.
Transporting and installing several of these to the quay on the coast requires a lot of manpower, and not only is there a high risk involved, but there are also problems with durability due to corrosion. There is a strong desire to develop a support for underwater installation that does not cause any inconvenience.

Therefore, the present inventors completed the present invention as a result of studies aimed at developing a support that can satisfy the above-mentioned requirements.

The gist of the present invention is to provide a hollow columnar structure made of a composite material made of reinforcing fibers and a matrix resin, in which at least a portion of the inner surface and/or outer surface of the hollow portion of the structure has a tensile modulus of elasticity. The structure is made of a composite material containing reinforcing fibers with a tensile modulus of 500 Kg/mm2 or more, and the intermediate layer of the thick part of the hollow columnar structure is made of a composite material containing reinforcing fibers with a tensile modulus of 500 Kg/mm2 or more. at least 1
The present invention provides a support for underwater setting, characterized in that two hollow columnar structures are provided with continuous cut portions in the axial direction.

It is desirable to use two types of reinforcing fibers used in the present invention, and it is essential to use reinforcing fibers with a tensile modulus of 8,000 Kg/mm2 or more on the inner surface and/or outer surface of the hollow part of the hollow columnar structure. requirements, especially 12,00
It is preferable to use one having a weight of 0 Kg/mm2 to 70,000 Kg/mm2. If the outer surface of the strut is made of a composite material whose reinforcing fibers have an elastic modulus of less than 8,000 kg/mm2, the strut will easily break when a large external force from water is applied.

Examples of such reinforcing fibers include S-glass fiber, aromatic polyamide, aromatic polyester, carbon fiber, silicon carbide fiber, alumina fiber, boron fiber, stainless steel fiber, etc. Group polyamide fibers and carbon fibers are preferred.

In addition, it is essential that the middle layer of the thick wall part of the hollow columnar structure of the present invention is made of a composite material containing reinforcing fibers having an elastic modulus of 500 Kg/mm2 or more, particularly 800 Kg/mm2 to 1
It is preferably made of a material containing 0,000 kg/mm2 of fiber.

This corresponds to the middle layer of a sandwich of hollow struts, and is effective in preventing the layer from breaking when a tensile force optionally applied by the float is applied.

Suitable examples of such reinforcing fibers include high-strength polyester fibers, E-glass fibers, and C-glass fibers. The reinforcing fibers may be in the form of long fibers or short fibers.

As the matrix resin constituting the composite material, either a thermosetting resin or a thermoplastic resin can be used.

As resins having particularly good seawater resistance, epoxy resins, unsaturated polyester resins, phenol resins, polyvinyl chloride, polyethylene, polypropylene, polysulfone, polycarbonate, etc. can be used.

It is necessary that at least a part of the hollow columnar structure of the present invention is provided with a continuous cut in the axial direction, and this cut portion is a vertical movement path for the fastening portion between the float and the fence provided inside the hollow columnar structure. becomes.

The width of this cut is preferably about 10 to 200 mm. Furthermore, it is an effective means to attach reinforcing plates to the structure at key points in order to prevent damage caused by the tensile force of the fence.

The hollow columnar structure of the present invention will be explained below based on the drawings.

Figures 1 and 2 are plan views of the hollow columnar structure of the present invention attached to a quay, where (1) shows the quay and (2) the hollow columnar structure, which is attached to the quay with bolts and nuts. There is. (3) is a float whose specific gravity is adjusted, and as the water level fluctuates up and down, the float moves up and down inside the hollow columnar body.The tip of the float (5) is a fence fastening part, and (4) is a fence fastening part. This is what is shown. FIG. 3 shows a cross-sectional view of the hollow columnar structure of the present invention. In the same figure (6
) indicates the outer surface layer of the hollow columnar structure, (8) indicates its inner layer, and the inner layer indicated by (6) is composed of a 0.5 mm thick aromatic polyamide composite material impregnated with epoxy resin. The outer layer shown in (8) is made of a 0.7 mm thick epoxy resin-impregnated carbon fiber composite material, and the middle layer serving as the sandwich part is made of a 10 mm thick epoxy resin-impregnated E-glass composite material. There is.

Since the weight of the hollow columnar body of the present invention is significantly reduced compared to that of steel, it is easy to transport and install.
The occurrence of accidents during construction has also been greatly reduced.

The pole of the present invention has good water resistance, good corrosion resistance, maintains extremely good vertical movement of the float, and has good fracture resistance when tensile force of the fence is applied. Ta.

[Brief explanation of the drawing]

FIGS. 1 and 2 are plan views showing the strut of the present invention attached to a quay, and FIG. 3 is a sectional view of the strut of the present invention. Patent applicant Mitsubishi Rayon Co., Ltd. Representative Patent attorney Taketoshi Tamura

Claims (1)

[Claims] A hollow columnar structure made of a composite material of reinforcing fibers and a matrix resin, wherein at least a part of the inner surface of the hollow part and/or the outer surface of the hollow columnar structure has a tensile modulus of 8,000 kg/ Formed from a composite material using reinforcing fibers with a tensile modulus of 500 Kg/mm2 or more, and the intermediate layer of the thick part of the hollow columnar structure made of a composite material using reinforcing fibers with a tensile modulus of 500 Kg/mm2 or more. What is claimed is: 1. A support for underwater setting, characterized in that the hollow columnar body is provided with a continuous cut portion in the axial direction at at least one location.