JP2858388B2 - Sliding and subsidence prevention of port and coastal structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation method for a foundation block and a wave-dissipating block used in harbors and coasts.

[0002]

2. Description of the Related Art Conventional foundation methods include the following. Various types of rock blocks have been developed to prevent rubble mounds from scattering, but none of them have been designed to prevent sliding due to their small weight. Ripstone construction method This is a simple construction method that involves simply adding rubble to the foundation of a wave-dissipating block. Stone cage method This method is to prevent rubble from scattering by waves.
This is a method of wrapping rubble in a net cage made of iron wire before putting it in. Sand mat method In this method, sand is packed in a bag made of synthetic fiber and spread under a wave-dissipating block to prevent settlement. Asphalt mat method This method is called asphalt mat and has a thickness of 5-8
It is a method of laying a plate-shaped asphalt mat of cm and preventing scouring and settlement. Train mat method In this method, six single blocks are bonded to a sheet made of synthetic fiber called a campus sheet, and these six blocks are successively engaged and connected, and a concrete block and a campus sheet are combined. This is a method of preventing scouring and sinking. Top block construction method This construction method is to install a top block concrete block in a row and try to prevent settlement by the unique support force of the top block.

[0003]

The conventional construction method has the following disadvantages. (Refer to 1991 Minato Disaster Prevention No. 110, pages 24 to 27.) In conventional consolidation blocks, no measures have been taken to prevent subsidence and sliding, and the seabed has been scoured or liquefied by waves to sink sequentially from the tip block. It had the disadvantage of sliding and eventually breaking down to the embankment. In the rubble method, rubble is scattered by waves,
Sliding and subsidence of wave-dissipating blocks is inevitable due to liquefaction of the seabed ground. Although the stone cage method can prevent scattering of rubble at the beginning of construction, it has the same disadvantages as the rubble method in which the wire mesh is broken by sandblasting or corrosion. In the sand mat, a portion where the wave-dissipating block is not placed is damaged by repeatedly moving up and down due to the waves, and the period of playing a role of preventing settlement is short. Since the asphalt mat cannot withstand the concentrated load of the wave-dissipating block, a stone basket and a covering block are required, and it is expensive. In addition, submergence due to liquefaction of the seafloor ground, and the mat itself is long, adversely affected by waves and tides, resulting in poor workability. (The 35th Coastal Engineering Lecture Papers 1988
(See P402 to P406) Since the train mat has a dense connection structure of blocks, construction is impossible due to slight bad marine conditions such as waves and turbidity. In addition, there are still problems such as a structure in which concrete blocks are laid, which is expensive, and that the useful life of the campus sheet is uncertain. The top block has problems that it cannot be used as a foundation method for coasts with deep water and harbors, that it takes time to install, and that it is expensive because of the structure of laying concrete blocks. In the “Publication Patent Publication (A)” published on Jan. 30, 1992 (1992), “Ripple stones fall out at the end of the connecting foundation frame” Issues remain, such as fears.

[0004]

In order to achieve the above object, a rectangular consolidation block is connected to the seabed at the laying position, and is connected to the seabed with a wire from a connecting metal fitting attached to the short side surface. The present invention, which has been solved by connecting to a laterally shaped steel section, will be described in detail below.

[0005] It is effective to incline the above-mentioned consolidation block so that the height of the block is reduced gradually toward the offshore side in order to reduce reflected waves due to waves. For this reason, the weight of the tip portion is insufficient, and several holes are preferably formed in the inclined surface of the block to prevent the block from rising due to the lifting pressure. On the other hand, a U-shaped connecting metal fitting is attached to the side surface on the short side opposite to the inclined surface, and is installed on the seabed at the installation position with the inclined surface offshore. A wire is attached to the U-shaped connecting metal fitting on the rear side, and a shape steel is connected to the end of the wire to be installed on the sea floor.

[0006]

When large waves act on the substructure constructed as described above, scouring or liquefaction occurs on the seabed ground at the tip of the consolidation block. Along with this, the consolidation block tries to slide offshore, but is pulled by the wire, so that it sinks from the end to the unliquefied seabed, preventing the inside rubble from falling out,
Prevent liquefaction of the seabed ground from reaching the embankment.

[0007]

Embodiments will be described with reference to the drawings.
In FIG. 1 and FIG. 2, a wire 3
And connected to the sea bottom at the laying position as shown in FIGS. 4 and 5. At this time, in order to reduce the weight per unit area of the consolidation block, the consolidation block was installed so that rubble could be introduced into the consolidation block. As shown in FIGS. 4 and 5, circular partition frames are staggered in contact with the consolidation block so as to hold the wire 3 and the shaped steel 4. After this, rubble is thrown into each circular partition frame and between the circular partition frames. A small rubble stone 7 is put in the lower part, and a large rubble stone 8 is put in the upper part. Set up blocks.

[0008]

Since the present invention has the structure as described above, the following effects can be obtained.

By installing a stiffening block fixed with a wire at the tip of a substructure at a harbor or seashore, it is possible to prevent rubble from falling inside and prevent liquefaction of the seabed ground from reaching the embankment.

[Brief description of the drawings]

FIG. 1 is a plan view of a root compaction block.

FIG. 2 is a side view of a foundation block.

FIG. 3 is a perspective view of a circular partition frame.

FIG. 4 is a plan view showing a state in which a root compaction block is laid.

FIG. 5 is a conceptual diagram of a settlement state of a consolidation block.

FIG. 6 is a conceptual diagram showing a subsidence situation when a root compaction block is used for a submerged embankment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rooting block 2 Connecting bracket 3 Wire 4 Shaped steel 7 Small rubble 8 Large rubble

Claims (1)

(57) [Claims] 1. A wire (3) is attached to a connecting metal fitting (2) attached to a short side of a solidification block (1) having a rectangular flat surface and a trapezoidal side surface. (4) Connecting and laying laterally on the sea floor, a port and coastal structure sliding prevention basic construction method.