JPS6334923B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm type buoyant structure for submarine foundation work.

When carrying out construction work such as dredging and reclamation protruding into the sea from land, a barrier is created by continuously sinking steel or concrete boxes around the perimeter of the planned area, removing seawater, etc. inside the wall, and removing soil and sand into the wall. Construction work is being carried out in which materials are brought in and buried.

Conventionally, in such construction, iron or concrete boxes such as those mentioned above are towed to the target area and installed continuously, but when towing, the top surface of the box is covered with a cover such as an iron plate to prevent contact with the box. Towing becomes possible by sealing the surface and installing an air supply device on the top surface of the lid to send air into the interior to generate buoyancy. In this case, since the airtightness between the lid and the box is insufficient, an air supply device is indispensable to replenish air from time to time, and a large amount of expense is required to set up and maintain this air supply device. Another disadvantage is that in order to install the box on the seabed, the part where the bottom of the box comes into contact with the seabed must be penetrated into the seabed to level the ground, which is very expensive. It was hot.

The present invention solves this conventional drawback by providing a shaped steel lattice partition near the bottom of the hollow part of the above-mentioned iron or concrete box, and forming an inner peripheral wall on the lower surface of the partition. This is a diaphragm-type buoyancy structure for submarine foundation work, which is made by fixing synthetic rubber-coated cloth diaphragms to the inner circumferential wall of the bottom of the box, and by using this structure, the above-mentioned conventional drawbacks can be solved. It is.

In other words, when towing, the space below the diaphragm is filled with air, and at the destination point, fresh concrete is poured from the top of the box and dropped onto the diaphragm, and the diaphragm gradually expands downward and inverted. The ready-mixed concrete is filled in a bag-like shape, and the bottom of the bag adapts to the unevenness of the seabed, allowing the ready-mixed concrete to solidify stably together with the diaphragm, eliminating the need for costly leveling work. It becomes.

Next, the structure of the present invention and its method of use will be explained with reference to illustrated embodiments.

Figure 1 is a plan view of the diaphragm type buoyant structure (hereinafter simply referred to as a box) for submarine foundation work according to the present invention, and its shape is A (A) or B (B).
It has a shape like this, and is towed to the local destination as a continuous body as shown in Figure 2 (Top view) A and B.
FIG. 3 is a longitudinal sectional view thereof. 1 is a box made of iron or concrete, 2 is a grid partition made of shaped steel, 3 is a diaphragm made of synthetic rubber-coated cloth, and 4 is a diaphragm 3.
This is a backing plate for tightening and fixing bolts to the wall of the box 1 near the bottom of the inside surface of the box 1. 8 is a bolt tightening part.

The space inside the lower surface of the partition plate 2 of the box 1 is airtight and watertight due to the diaphragm, and the diaphragm 3 made of synthetic rubber-coated cloth that can withstand the required water pressure is supported by the steel grid partition 2, so that the space inside the diaphragm is contains air, and Figure 3 a,
It is possible to prevent water from entering spaces b, c, and d, and the spaces b, c, and c are arranged so that the buoyant force generated when these spaces a, b, c, and d are submerged below the sea surface is equal to the weight of the box. By determining the position, the box 1 can be floated and towed to a desired position. The box can have a form as shown in the top view of Figure 1 A or B, and can be connected as shown in Figure 2 A or B and towed to the destination point, where it can be lowered. .

When the predetermined position is reached, ready-mixed concrete 5 is poured from the top of the box as shown in FIG. Fresh concrete is deposited on the seabed 6 together with the diaphragm in a shape corresponding to the uneven shape. 9 is the sea level, and in this way, the concrete solidifies and a stable box is installed at the desired location.The boxes are connected in series and the enclosed interior is eventually drained of seawater and filled with earth and sand or concrete. can be landfilled.

By using the diaphragm-type buoyant structure of the present invention, the work that conventionally required the grounding point on the bottom of the box to be submerged, leveling the ground, and setting the foundation can be easily omitted. Furthermore, according to the conventional method, there is no need to carry out air supply work into the space between the box and the lid. In the figure, 7 is a sealant filled between the box and the diaphragm.

[Brief explanation of the drawing]

Fig. 1 is a top view of the diaphragm type buoyancy structure for submarine foundation work according to the present invention, where A and B show typical shapes, and Fig. 2 is an explanation showing an example of the method of connecting the box. (top view), FIG. 3 is a longitudinal sectional view thereof, and FIG. 4 is an explanatory diagram of the installation work of the diaphragm type buoyancy structure of the present invention on the seabed. 1... Box, 2... Partition grid (made of shaped steel), 3...
...Diaphragm, 4...Bolt tightening plate, 5...
... Fresh concrete, 6 ... Seabed, 7 ... Filling sealant, 8 ... Bolt tightening section, 9 ... Sea surface, A, B
...Boxes with different cross-sectional shapes, a, b, c, d...
A positioning point for the space formed by the sea surface and the partition inside the box.

Claims (1)

[Claims] 1. In a steel or concrete box for submarine foundation work, a shaped steel lattice partition is provided near the bottom of the hollow part of the box, and a diaphragm made of synthetic rubber-coated fabric is inscribed in the bottom surface of this partition and the inner peripheral wall of the box. A diaphragm-type buoyant structure for submarine foundation work that is fixed to the bottom inner peripheral wall.