JPS5949371B2 - Coastal construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention prevents subsidence by reducing the load of foot-protected foundations built on the coast of the sea or river, and also allows water to flow freely to constantly balance the physical and natural conditions inside and outside the embankment. The purpose of this is to ensure the safety of the retaining wall.

Incidentally, to explain the embodiment in detail with reference to the drawings, 1 is a concrete pile, which is assembled into a crossbeam to form a member a, and the member a is buried in sandy soil S along the coast, and is placed at a predetermined interval. Build the foot hardening foundation f by supporting it with the column-shaped pits 2 buried in the ground.

A pedestal 3 is formed on the member a, and a retaining wall 5 is attached to an earthen embankment 4 using this as a base.

Note that 6 is a connecting rod that connects the pivot leg 7 of the top-shaped counter 2, 6 is a drainage gutter, and W is a seawater etc.

This method uses a large number of piles 1 when constructing the foot protection foundation f.
were assembled into parallel girders or rafts to form member a, and this member a was buried all at once along the coast, and was supported by column-shaped shafts 2 buried at predetermined intervals or at no intervals.
In addition, seawater or river water W infiltrates the sandy soil S from the gaps between well girders or dams and from the hollows of the piles, allowing water to flow freely to the embankment bottom, and conversely allowing groundwater to seep out. There is no interruption at all, and the top-shaped shaft 2 significantly reduces the load on member a, retaining wall 5, etc. due to the physical action of its conical body, which reduces the pressure on the sandy soil S and prevents subsidence. This has the effect of making it easier for seawater, river water, and groundwater to enter and seep out, and to maintain a balanced and stable physical and natural condition inside and outside the embankment at all times.

Conventionally, this type of construction method involved pouring a concrete foundation about 2 cubic meters in size on the cut end on the coast and using this as a base to attach a retaining wall, but this method prevents the intrusion of seawater, river water, and seepage of groundwater. Blocking off and preventing free exchange between the inside and outside stems from the simple idea of artificially subjugating the forces of nature, and goes against the natural law that rejects capillary action that occurs on the free surface of water or within banks. It's nothing special.

Furthermore, there was a risk that the concrete foundation would pressurize the sandy soil due to its own load, causing it to sink and eventually lead to the destruction of the retaining wall.

A good example of this is the ISB incident that occurred in Fuji City, Japan last August.
(Details in Shizuoka Shimbun morning edition, August 20th) Due to the effects of Typhoon No. 10, heavy rains hit, and the foundations of the new seawalls for Akabuchi and Sutsu were washed away by muddy currents and sank, causing waves on the concrete walls. This posed a danger, such as cracks forming and falling, or holes forming inside the concrete wall.

Considering these realities, it is easy to think of Luke's need for a solid foundation that will not resist the forces of nature.

However, in the construction method of this invention, as mentioned above, piles through which water can easily pass are assembled into a crossbeam or raft to form member a, and member a is connected to the member a by means of a column-shaped shaft 2, which has the physical effect of reducing the load with a conical body. A supported foot protection foundation f was constructed and buried all at once on the coast, and a retaining wall, that is, a concrete wall, was attached to this foundation, so the sinking of the foot protection foundation was negligible. Sea and river water infiltration and underground water seepage always flow freely and there is no blockage, so there is no internal resistance, and the physical and natural conditions inside and outside are always in balance, ensuring the stability of the seawall.

Therefore, even if a river temporarily rises or there are high waves on the sea surface, causing an imbalance in the water level, there will be no undue pressure, and the free surface of the water will gradually work to restore normal conditions. Seawalls or river embankments are the result of a revolutionary invention as a permanent disaster prevention method.

Furthermore, this construction method can be used in the foundation structure of a building or structure, or if blocks with water passage holes are installed in parallel on top of the block-shaped pit or without using the block-shaped pit instead of piles, underground water can pass through. It should be said that the scope of the present invention is that it is possible to plan the flow and prevent the subsidence of the ground.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the construction method of the present invention, and FIG. 1 is a front view of the seawall, and FIG. 2 is a longitudinal sectional side view thereof. 1... Pile, a... A member made of piles assembled into a parallel girder,
2... Column type pit, 3... pedestal, 4... earth embankment, 5...
...Hori retaining wall.

Claims (1)

[Claims] 1. Build a foot protection foundation by burying members assembled into single-girder pile wells or rafts along the coast, supporting them with column-shaped shafts buried at predetermined intervals or at random intervals, and A coastal construction method characterized by forming a pedestal and attaching a retaining wall from the pedestal.