JP2863814B2 - Steel caisson with excellent corrosion resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a caisson to be installed in water, and particularly to a caisson having good corrosion resistance.

[Problems to be solved by conventional technology and invention]

A caisson generally used as a foundation of a structure such as a breakwater has conventionally been made of reinforced concrete.

However, such a conventional caisson requires a large number of man-hours for arranging reinforcing bars and formwork, and has a tendency to increase in weight in order to respond to demands for enlargement and lengthening. Met.

As a caisson that compensates for this drawback, there is a caisson that uses a steel plate as a structural member. Such a structure is being widely used, particularly in ports, for reasons such as a large load bearing capacity and labor saving in on-site construction.

However, in a caisson using such a steel plate,
It is natural that a reliable response to anticorrosion is necessary.

[Means for solving the problem]

In view of the above, the present invention has developed a steel caisson having high corrosion resistance while using a steel plate as a result of various studies.

That is, in the present invention, the inner side is formed by a steel plate, and the outer side is entirely formed by an asphalt layer, or a heavy corrosion protection coating or a concrete layer is provided on the side wall surface of the outer side, and the asphalt layer is provided on the other side. It is characterized by the following.

[Action]

By covering the anticorrosion layer with steel plate on the inside and asphalt or heavy paint or concrete on the outside, no caisson construction work is required, and no reinforcement, formwork, and support work are required. The main body is easy to manufacture as compared with a conventional caisson, and has features such as good workability such as easy handling on site because of its light weight. Also, when installed in the sea or the like, it has a great effect of preventing corrosion of the steel sheet by seawater or the like.

In addition, since steel plate is used, the strength is high, the amount of overhang of footing can be greatly increased compared to the conventional one, and the end toe pressure can be reduced, so the foundation construction cost especially on soft ground is greatly reduced. Having.

〔Example〕

 Next, an embodiment of the present invention will be described.

As shown in FIG. 1, in a caisson (2) installed on the mound (1), the inner surface was formed of a steel plate (3), and the outer surface was configured as follows.

That is, the outer side surface of the side wall was subjected to heavy anticorrosion coating (4), and the asphalt (5) layer was provided outside the bottom surface and the top surface of the steel plate (3). Further, crushed stone, underwater concrete, asphalt or a mixture thereof is provided on the asphalt layer on the upper surface thereof, and as a level adjustment layer (6) for placing an upper caisson (10) on the caisson (2). Provided.

An opening (7) is formed in the steel plate (3) on the upper surface, and sand can be blown from the opening (7) if the filling sand (8) is required inside the caisson (2). Also, (9) in the figure is a crushed stone stopper at the top.

With a caisson having such a configuration, the main body other than the filling sand can be mass-produced in a factory, and therefore, there is an advantage that quality control can be sufficiently performed.

Further, such a steel structure is technically very easy because a conventional design method and manufacturing method can be used.

The outer surface of the caisson has an asphalt layer and a heavy-duty anticorrosion paint layer, so it has a permanent structure against corrosion. Further, since the lower surface of the caisson is an asphalt layer, it has an anti-slip mechanism.

The outer surface of the steel plate may have a configuration in which an asphalt layer is provided on the entire surface in addition to the above configuration.

〔The invention's effect〕

As described above, according to the present invention, the caisson body is lightweight and high-strength, so that it can easily cope with an increase in the size and length of the caisson, and has various advantages in terms of manufacturing and construction, and is economically advantageous. It is excellent.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is an explanatory view including a side section of a caisson. DESCRIPTION OF SYMBOLS 1 ... Mount 2 ... Caisson 3 ... Steel plate 4 ... Heavy corrosion protection coating 5 ... Asphalt 6 ... Level adjustment layer 7 ... Opening 8 ... Filling sand 9 ... Stone crushing stone 10 ... Upper caisson

Claims (2)

(57) [Claims] 1. A steel caisson having excellent corrosion resistance, wherein the inside is formed of a steel plate and the outside is entirely formed of an asphalt layer. 2. A steel caisson having excellent corrosion resistance, characterized in that an inner side is formed of a steel plate, a heavy anticorrosion coating or a concrete layer is provided on a side wall of the outer side, and an asphalt layer is provided on the other side. .