JPH0224411A - Offshore reclamation work - Google Patents

Abstract

PURPOSE:To improve reclamation efficiency and enable a continuous deliver of earth and sand to an offshore area to be reclaimed by delivering earth and sand through a submarine tunnel extending from a land toward the offshore area and then through a vertical passage through which the offshore area is communicated with the submarine tunnel. CONSTITUTION:A submarine tunnel 1 extends from a land (a) to an offshore area S to be reclaimed. The submarine tunnel 1 communicates with the offshore area S through a vertical passage 2 which projects above a sea level. Earth and sand (b) is delivered through the submarine tunnel 1 to the vertical passage 2 and then from an upper part of the vertical passage 2 into the offshore area S. Before reclamation, partition walls 10a are installed on a submarine ground to isolate an area S' to be reclaimed from the surrounding sea area. Sea water in the isolated area S' is discharged through water purifying facility 11 to outside sea depending upon an amount of earth and sand being delivered to the area.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of reclamation on the sea surface away from land.

(Prior Art) Conventionally, as a method of forming reclaimed land in a predetermined offshore area, that is, in a reclaimed area, earth and sand for reclamation is loaded from land onto a sand transport ship, and the sand transport ship is operated by self-propelled navigation or by tugboats. Sediment is transported by tow and discharged into the sea within the reclamation area for reclamation.

(Problems to be Solved by the Invention) The conventional land reclamation method using earth and sand transport ships requires a large number of transport ships, which obstructs the navigation of other ships between the transport routes, and returns empty, resulting in poor transport efficiency and poor weather conditions. In this case, transport is not possible and there is a high risk of injury to one person, and there are also problems such as the discharge of earth and sand from the transport vessel onto the sea surface, which contaminates the nearby seawater.

The present invention was developed to address the above-mentioned problems, and its purpose is as follows.

By transporting the earth and sand from land to the offshore reclamation area using submarine tunnels and vertical passages, it is possible to continuously transport the earth and sand, increasing efficiency, and converting the reclamation area into an isolated reclamation area and an expanded isolated reclamation area to purify the seawater inside. An object of the present invention is to provide a marine reclamation method that prevents pollution of sea areas and improves the efficiency of marine reclamation by discharging wastewater.

(Means for Solving the Problems) The present invention provides an undersea tunnel under the seabed in a reclaimed area from land to sea, and provides a vertical passage that protrudes above the sea surface of the reclaimed area and communicates with the undersea tunnel.

It is characterized by a structure in which the earth and sand are carried from the undersea tunnel through a vertical passageway to the reclamation area from above, and the reclaimed area is filled with the same earth and sand, and the earth and sand is continuously conveyed through the undersea tunnel and the vertical passageway to be carried out into the reclamation area. To make this possible, sheet piles are driven into the reclaimed area around the outer periphery of the vertical passage to create an isolated reclaimed area that is isolated from external seawater, and water purification equipment is used to purify the seawater in the isolated reclaimed area to external seawater in proportion to the amount of soil brought in. By discharging water and reclamation while discharging it, we prevent contamination of external seawater, and as the reclamation progresses in the isolated landfill area, we drive sheet piles around the outer periphery of the isolated landfill area to create an expanded isolated landfill area that is isolated from the external seawater. By filling in the expanded isolated landfill area after filling in the remote landfill area, a wide range of land filling can be efficiently carried out in the filling area around the outer periphery of the vertical passage.

(Function) An undersea tunnel that reaches from land to the bottom of the seabed in the offshore reclamation area is provided, and a vertical passage that protrudes above the sea surface of the reclamation area and communicates with the undersea tunnel is installed, so that earth and sand can flow from the undersea tunnel through the vertical passage and into the vertical passage. The soil is continuously transported from the upper part into the reclamation area and reclaimed, and the transport and transport of the earth and sand into the reclamation area is carried out efficiently and effectively, and the earth and sand is transported directly and continuously from the upper part of the vertical passage to the sea surface. The amount of seawater agitation caused by the removal is reduced, significantly reducing contamination and the area of contamination.

In addition, sheet piles were driven into the reclaimed area around the outer periphery of the vertical passage to create an isolated reclaimed area isolated from external seawater, and water purification equipment separated the area by 11 i! The seawater within the landfill area is purified and drained into the external seawater, the sheet piles and said purification.

Drainage prevents contaminated seawater from flowing outside, and also facilitates land leveling within the isolated landfill area. Furthermore, sheet piles are driven around the outer periphery of the isolated reclaimed area to create an expanded isolated reclaimed area isolated from external seawater, and the area is subsequently reclaimed, allowing efficient reclamation work over a wide area around the outer periphery of the vertical passage.

(Embodiment) An embodiment of the present invention is shown in FIGS. 1 to 4, and
i+ is an undersea tunnel, (2) is a vertical passage, and (a) is on land.

(bl is earth and sand for reclamation, (S) is planned land for reclamation on the sea,
In other words, it is a reclamation area, where an undersea tunnel (1) is provided under the seabed of a predetermined reclamation area (S) from land (al to sea), and is connected to the undersea tunnel (1) above the sea surface of the reclamation area (S). A vertical passageway (2) protruding from the tunnel is provided, and the earth and sand (b) is transported from the top through the vertical passageway (2) from the undersea tunnel +11 to the reclamation area (Sl), and the earth and sand (bl) is used to reclaim the reclamation area (S). .

The undersea tunnel (1) is installed as a transport route for land soil (b) from land (al) to below the seabed in a predetermined reclamation area (S) on the sea, and is excavated by various shield construction methods. ) is erected at a predetermined position within the reclamation area (S), communicates with the submarine tunnel (1) under the seabed, and is constructed by being transported by sea in a vertical cylindrical body manufactured in advance at a factory.

Figure 4 (Reclamation area (S) by offshore work vessels etc. as shown in N)
) A counterbore surface (4) and an insertion hole (5) are provided at a predetermined position on the seabed (A), and the vertical cylinder is inserted into the insertion hole (5) with the upper part protruding above the sea surface. (4) Seal material (6
a) Set up (using underwater concrete, etc.) and
a') and seal it securely (see Figure 4C). Next, drain the seawater inside the vertical cylinder by appropriate means, and
Connected to the lower end of the vertical cylinder at the tip of the undersea tunnel (1) excavated by the shield method etc. from the land (al side),
Open the hole and fill the joint with sealing material (6b) to prevent water from seeping in from the seabed strata (see Figure 4C).

In said undersea tunnel (1) and vertical passage (2).

For example, earth and sand conveying equipment (7a), (7b) such as Everheld conveyor, screw conveyor, packet conveyor, etc. are installed,
Sediment conveyance equipment (7) is installed at the top of the vertical passage (2).
An earth and sand transport facility (7c) connected to b) is installed,
The earth and sand transport equipment (7c) Vi has a discharge port (7d) that protrudes from the top of the vertical passageway (2) and is rotatably operated, and carries out the earth and sand that has been continuously transported by the earth and sand transport equipment (7b) through the discharge port. (7d) and discharge into the landfill area (S) around the vertical passageway (2) for landfill. Since the discharge port (7d) at the top of the vertical passageway (2) continuously discharges the sediment (b) into the sea, there is less pollution of the seawater compared to the discharge of sediment by a carrier ship.
The scope of contamination is greatly reduced.

During the reclamation, the reclamation area (
A sheet pile (10a) is driven into S) to create an isolated landfill area (S') isolated from external seawater (Fig. 4 D), and water purification equipment αυ is used to reduce the amount of seawater brought in to the isolated landfill area (S'). In response to this, it will be purified and discharged into the external seawater outside the sheet pile and then landfilled. Isolated landfill area (S) using sheet piles (10a)
Isolation ') is to prevent seawater mixed with sediment from flowing into the outside seawater and contaminating it. This is prevented by water purification equipment t11).

In other words, it is possible to adopt water purification equipment (111 ke 5), an appropriate conventionally known mechanism, and a seawater treatment capacity commensurate with the amount of soil brought in by the earth and sand transport equipment (7c), and a sheet pile (10a).
When reclamation is performed in the isolated landfill area (S') separated by In response, the seawater in the same area is purified and drained into the seawater outside the sheet pile (]Oa), suppressing the rise in water level in the isolated landfill area (S'), and draining contaminated seawater from the sheet pile in the same area. Prevent overflow, isolate by sheet pile (10a) K, purify the seawater, and prevent pollution of the sea area outside the wastewater VC. The water purification equipment αυ 1, for example, sucks in the supernatant seawater in the outer periphery of the isolated landfill area (S'), separates earth and sand using a filter device (not shown), and converts it into a sheet pile (
10a) Release to the outside.

In response to the progress of reclamation within the isolated reclamation area (S'),
As shown in Figure 3, sheet piles (
10b) was installed to isolate the area from external seawater, and water purification equipment (1
11 will be installed in the expanded isolated landfill area (S) to purify the seawater in the same manner as described above and drain it into the seawater outside the sheet pile (10b), and when the reclaiming in the isolated landfill area (α) is completed, the earth and sand will be carried out. The discharge port (7d) K of the equipment (7C) is connected to the earth and sand transport equipment (7e) that reaches the outside of the sheet pile (10a), and the earth and sand transport equipment (7e) is rotated together with the discharge port (7d) by an appropriate means. , relocated, and continuously transport and fill in the expanded isolation area (S).

When the earth and sand protrudes above the sea surface as a result of transporting the earth and sand into the isolated reclamation area (S'), the land is leveled by appropriate means, and land leveling equipment such as bulldozers and compactors are brought in to level the land. At the same time, the land leveling is spread from head to toe to the outer periphery,
Eventually, the entire area within the isolated landfill area (S') and the expanded isolated landfill area (S') will be covered, and a new expanded isolated landfill area will be created around the outer periphery of the expanded isolated landfill area (S'), and the same process will be repeated. The land is leveled and a wide area is reclaimed.As the final process of earth and sand reclamation within the designated reclamation area, construction of a seawall to form the final outer wall and, in some cases, construction of a bridge connecting with the land (δ) is carried out. The undersea tunnel (1) and the vertical passage (2) will be used as a means of transportation, equipment, and material transportation during the reclamation work, and upon completion of the reclamation, the earth and sand transport equipment will be removed, and the underground tunnel (1) and vertical passageway (2) will be used as a source of transportation, communication, etc. As a route for cables, gas, water piping, etc.

Furthermore, it is used as a means of transportation such as subways and cargo handling/transportation means.
It can be used for conveyance equipment, sidewalk areas, etc.

The above embodiment of the construction method of the present invention is shown in Fig. 4 (A) to D).
Although the explanation is based on the four steps shown in the following, the construction method is not limited to this method.For example, after excavating an undersea tunnel,
The excavation equipment was removed, and an insertion hole for forming a vertical passage using a vertical cylinder was drilled from the sea, and the same vertical passage was inserted to drain and purify the water in the undersea tunnel, and then sheet piles were driven. , Undersea tunnel and vertical Vi passage (vertical cylinder)
It may also be a process in which earth and sand conveying equipment is installed inside the site and the process is sequentially reclaimed.

In addition, the sheet piles can be driven before constructing the vertical passage, and the outside of the vertical passage can be surrounded in a circular or rectangular shape, and after the reclamation is completed, the sheet piles can be left as they are or pulled out and reused. If the seabed strata in the reclamation area are weak, the seabed strata may be reinforced with sand piles, etc. before the reclamation is constructed, or the reclaimed ground itself may be strengthened. be.

(Effects of the Invention) The present invention is as described above, and includes an undersea tunnel that reaches from land to below the seabed in a reclaimed area on the sea, and a vertical passageway that communicates with the undersea tunnel and protrudes above the sea surface in the reclaimed area. The earth and sand are conveyed and carried out from the top of the vertical passageway to be reclaimed by pressure inside the reclaimed area, so that the navigation of other ships is not obstructed and the soil is not affected by the weather, and the soil is continuously and efficiently conveyed and transported into the reclaimed area. The contamination and range of seawater contamination caused by this transport is significantly reduced compared to discharge from a carrier ship, and the efficiency of landfill construction is greatly improved.

In addition, sheet piles are driven into the reclaimed area around the outer periphery of the vertical passage, creating an isolated reclaimed area that is isolated from external seawater. Water purification equipment is used to purify and drain the seawater in the isolated reclaimed area in accordance with the amount of soil brought in. Contamination is prevented, and land leveling after N filling in the isolated landfill area becomes easier.Furthermore, by driving sheet piles around the outer periphery of the isolated landfill area and creating an expanded isolated landfill area isolated from external seawater, - The outer periphery of the vertical passage, that is, the reclaimed area, can be efficiently reclaimed over a wide area.

Marine tunnels and vertical passageways after reclamation is complete.

It can be used as a facility area for electricity, water, gas, communications, etc. for a landfill, or as a means of transportation such as a subway or a pedestrian walkway.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various modifications may be made within the scope of the spirit of the present invention. It is something.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view when an expanded isolated landfill area is provided, Fig. 3 is a plan view of Fig. 2, and Fig. 4 (A). to CD> are longitudinal cross-sectional views showing each of the vertical passages. a: Land a': Seabed S: Reclamation area S': Isolated reclaimed area S'': Expanded isolated reclaimed area 1: Undersea tunnel 2: Vertical passage

Claims (1)

[Scope of Claims] 1. An undersea tunnel is provided under the seabed in a reclaimed area from land to sea, and a vertical passage that protrudes above the sea surface of the reclaimed area and communicates with the undersea tunnel is provided, so that earth and sand are transported from the undersea tunnel through the vertical passage. This is a marine reclamation method that is characterized by transporting the soil from above to the reclamation area and filling the area with the same soil. 2. Drive sheet piles into the reclaimed area around the outer periphery of the vertical passage to create an isolated reclaimed area isolated from external seawater, and use water purification equipment to purify and drain the seawater in the isolated reclaimed area to external seawater in proportion to the amount of soil brought in. 2. The marine reclamation method according to claim 1, wherein the method comprises reclamation. 3. With the progress of reclamation of the isolated landfill area, sheet piles are driven around the outer periphery of the isolated landfill area to create an expanded isolated reclaimed area isolated from external seawater, and the expanded isolated reclaimed area is reclaimed after the isolated reclaimed area is reclaimed. The marine reclamation method according to claim 2.