JP2653345B2 - How to build a breakwater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a breakwater, and an object of the present invention is to rapidly construct a breakwater in a sea area under severe weather conditions using a steel sheet cell.

[0002]

2. Description of the Related Art In most cases, a method of constructing a breakwater in a sea area having severe weather conditions such as the open sea is by laying a concrete caisson, and there are few examples using a steel plate cell. Steel plate cells are often used for the construction of relatively quiet coastal quays and seawalls, and as a method of construction, a method of embedding the lower part of the cell into the seabed foundation ground has been adopted.

[0003]

The steel plate cell method of the penetration type is a method of driving a steel plate cell to a predetermined position by vibration using several vibro-hammers, so that it is sufficient when the submarine foundation ground is strong. In some cases, and there are cases where it is not possible to adopt it even if one wants to adopt it.

[0004]

SUMMARY OF THE INVENTION The present invention is a construction method which can be carried out irrespective of the strength or softness of the submarine foundation ground, and makes full use of the rapid construction property of the steel plate cell construction method.

That is, according to the present invention, underwater concrete is poured into a submarine foundation ground whose surface layer is dredged to a support layer.
A method of constructing a breakwater by laying down a steel plate cell having a bottom plate concrete reinforcing steel material on the bottom surface and having a steel material for preventing slip on the bottom outer peripheral surface, filling the steel plate cell with a filling material, and then covering with a precast concrete lid. It is.

The gist of the present invention is that the bottom of the steel sheet cell is integrated with the seabed foundation ground by concrete to stabilize the steel sheet cell body. For this reason, a steel material for bottom slab concrete is welded to the bottom surface of the steel plate cell, and a slip-preventing steel material is welded to the outer peripheral surface of the bottom. The seabed shall be dredged from the surface to the support layer. When submerged concrete is poured into the foundation ground and the steel plate cell is laid down while the concrete does not harden, the concrete and bottom slab concrete is built at the bottom of the steel plate cell, and this concrete and bottom slab concrete is attached to the steel plate cell side. It is reinforced with the steel material for reinforcing the bottom slab, and is stopped and integrated with the steel material for preventing slippage. After the construction of the reinforced concrete and bottom slab concrete, the inside of the steel plate cell is filled with a filling material, which further increases the weight, and the weight also resists waves and improves the stability of the steel plate cell body. Can be

[0007] The steel plate cell used in the present invention is formed by welding a steel plate into a cylindrical shape in the same manner as a normal steel plate cell, and is reinforced by welding longitudinal ribs and horizontal ribs to the inner surface. In the present invention, a steel material for reinforcing the bottom slab and a steel material for preventing slippage are further welded to the steel plate cell. When a steel sheet cell is constructed in an ice sea area according to the present invention, in order to prevent damage to the steel sheet cell at the time of collision with drift ice, a mold for inwardly wrapping concrete and a steel material for preventing slippage are previously provided on the inner surface of the steel sheet cell. It is preferable to weld the steel sheet and then to apply the inner winding concrete after the steel sheet cell is installed. It is the same as the conventional method that an arc-shaped arc portion is laid to interconnect the steel plate cells. As with the steel plate cell, this arc portion is also settled by welding a steel material for concrete reinforcement and a steel material for preventing slippage to the bottom portion, and laying concrete and bottom slab concrete.

The stiffening concrete and bottom slab concrete according to the present invention is usually 1 to several meters depending on the size of the steel sheet cell.
It is cast to the thickness of. The construction of the stiffened concrete and bottom slab concrete not only integrates the steel plate cell with the foundation ground, but also prevents suctioning of the filling material and scouring.

As the filling material, sand or crushed stone is used as usual. However, in a cold sea area, water remaining in the filling material may freeze and damage the steel plate cell. It is preferable to take measures such as construction and mixing of antifreeze into the filling material.

[0010] The upper part of the steel plate cell constructed in the present invention is usually provided with an upper concrete made of cast-in-place concrete.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction method of the present invention will be described below with reference to the drawings.

FIG. 1 shows a breakwater constructed according to the present invention,
(A) is a plan view, (b) is an AA cross-sectional view of (a),
(C) is a detailed view of a part B of (b), and (d) is a detailed view of a part C of (b).

FIG. 2 is a plan view of the bottom surface of the steel sheet cell.

As shown in FIG. 2, a steel plate 10 for reinforcing a bottom slab is welded to the steel plate cell 1 in a radial or lattice shape as shown in FIG. 2, and on the outer peripheral surface of the bottom, as shown in FIG. A steel material 9 for slip prevention is welded, and a steel formwork 7 and a steel material 8 for slip prevention are applied to the upper inner peripheral surface, as shown in FIG. Although not shown, the steel plate cell 1 is reinforced by welding vertical ribs and horizontal ribs on the inner surface.

The steel plate cell 1 is settled while the surface layer of the submarine foundation ground is dredged to the support layer and submerged concrete is poured in to construct the concrete and bottom slab concrete 5.
Steel plate cell 1 is concrete with slab concrete and bottom slab 5
Is integrated into the seafloor foundation ground. After filling the inside of the steel plate cell 1 with the filling sand 11 and constructing the inner winding concrete 6, it is covered with a lid 4 made of precast concrete. The arc part 2 connecting both sides of the installed steel plate cell 1 is settled down and installed in the same manner as the steel plate cell 1. The work is completed by placing the upper concrete 3 made of cast-in-place concrete on the lid 4 made of precast concrete.

[0016]

The steel plate cell bottom is integrated with the seabed foundation ground by concrete to stabilize the steel plate cell body, so it can be constructed regardless of whether the seabed foundation ground is strong or soft. It is possible to make full use of the properties, and furthermore, it is possible to prevent drainage and scouring of the filling material.

[Brief description of the drawings]

1A and 1B show a breakwater constructed by the present invention, wherein FIG. 1A is a plan view, FIG. 1B is a cross-sectional view taken along the line AA of FIG. 1A, FIG. 3 is a detailed view of a part C of FIG.

FIG. 2 is a plan view of a steel plate cell bottom surface.

[Explanation of symbols]

1 .... Steel cell, 2 .... Arc part, 3 .... Top concrete, 4 .... Lid, 5 ... Consolidated concrete and bottom slab concrete, 6 .... Concretely wound concrete, 7 .... Steel formwork, 8.・ Steel for slip prevention, 9 ・ ・ Steel for slip prevention, 1
0 ... Steel material for bottom slab concrete, 11 ... Sanding sand.

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nobuyasu Suzuki Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (56) References JP-A-58-11210 (JP, A) JP-A Sho 62-90408 (JP, A)

Claims (1)

(57) [Claims] 1. A steel plate cell having a bottom slab concrete reinforcing steel material on the bottom surface and a slip preventing steel material on the outer peripheral surface of the bottom surface, while placing underwater concrete on a submarine foundation ground having a surface layer dredged to a support layer, A method of constructing a breakwater by filling a steel sheet cell with a filling material and then covering with a precast concrete lid.