JPH0354723B2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application: The present invention is applicable to land reclamation work, in which earth and sand without rock walls are transported from an earth loading site to a landfill by an earth carrier that does not have an open-bottom type. This relates to equipment used at loading or unloading ports.

Conventional technology: When reclaiming a part of the sea to create a new artificial island, or creating a land-contact reclaimed land in the sea, the following procedure was usually followed.

(1) Build an outline of the planned landfill site, a so-called frame, using concrete caisson steel sheet piles, etc. A picture frame can be thought of as a temporary structure that serves as a quay.

(2) An open-bottomed earth carrier is brought in and out of the planned reclamation site outlined by a picture frame through the unfinished part of the frame, and the soil is sunk into the planned reclamation site, gradually increasing the water depth. Make it shallower.

(3) Make the shallow areas even shallower by pumping water mixed with sediment.

(4) Transporting earth and sand using earth transport vessels that are not open-bottomed,
The land area in front of the frame is gradually expanded by filling the inside of the frame with earth and sand using clamshells, batskukes, etc. from the outside of the frame.

(5) Once a certain amount of land is formed between the picture frames,
The land area will be expanded by transporting earth and sand using belt conveyors and dump trucks installed inside the frame.

Since reclamation work is carried out using more steps than usual, the use of the quay for the berthing of earth-carrying vessels for unloading is difficult as the reclamation work progresses due to the distance traveled by belt conveyors and dump trucks, so-called lateral movement. This led to an increase in the carrying distance and increased construction costs.

Additionally, if the strata of the ocean floor are disturbed during reclamation, it may cause partial subsidence of the ground after the reclamation is completed.
It is said that it is preferable to reclaim land in several layers while maintaining the flatness of the ocean floor as much as possible. However, in the conventional construction method, a stationary earth lifting machine was used from outside the frame in the final stage, which forced the earth and sand to be piled up near the waterline, causing partial subsidence.

Land reclamation work was also carried out from inside the picture frame, but inside the picture frame, the earth and sand that had been reclaimed fell down towards the seabed, and was further affected by the tides and waves, so the ratio was usually around 1:7. Because of the natural slope (called beach slope), a shallow coastline is formed naturally, making it difficult to use large soil transport vessels. As a result, inefficient land reclamation work using small earth-carrying vessels had to be carried out.

Therefore, the present inventor invented a new method for reclamation work that enables highly efficient reclamation work using large earth carriers and eliminates the drawbacks of the conventional technology described above. (Refer to Publication No. 168734).

Hereinafter, the invention described in the above-mentioned Japanese Patent Application Laid-open No. 168734/1988 will be briefly explained with reference to FIGS. 3 and 4.

FIG. 3 is a side view showing an example of an earth transport ship suitable for use in implementing the prior art, FIG. 4 is a plan view of the earth transport ship, and the illustrated earth transport ship 10 has a ship length of approximately
The vessel is 100 meters long, approximately 25 meters wide, and approximately 6 meters high, and is provided with a wide vehicle running surface 2 around the earth and sand loading section 1 or on the deck to allow dump trucks to run on it.

The quay wall 20 is composed of a vertical wall 21 constructed by driving steel sheet piles 21, for example, or a flap 23 placed on reclaimed earth and sand 22. The steel sheet piles can be replaced with concrete cells or the like, and in the case of earth and sand with a large angle of repose, it is sufficient to simply use an appropriate earth embankment.

The barge 30 includes a barge body 31 and a rampway 3.
2. The rampway is composed of hanging supports 33, and one end of the rampway 32 is engaged with the engagement portion of the flap 23, and the other end is engaged with the engagement portion of the earth carrier.

Purpose of the invention: The invention described in JP-A No. 58-168734 aims to remove the difficulty of unloading earth and sand by large earth carriers at the edge of the beach slope within the frame, by unloading from the outside of the frame, that is, by constructing a temporary quay. This was done with the aim of efficiently unloading cargo from.

However, in today's world where extremely large-scale land reclamation work has become commonplace, land reclamation inside the picture frame, full-scale wharf construction work outside the picture frame, land leveling in the area near the picture frame where the reclamation has been completed, construction of buildings, etc. are being carried out in parallel. As a result, there was a growing demand for efficient cargo unloading by large cargo vessels at the waterfront on the slope of the beach inside the frame.

The aim of the invention is to provide auxiliary equipment used to make this possible.

Configuration of the invention: In order to achieve the above-mentioned object, the present invention uses a semi-floating pier having the following configuration.

That is, the semi-floating pier of the present invention consists of a main body divided into a rectangular parallelepiped-shaped hollow chamber and a wedge-shaped hollow chamber by a partition wall, and a pump and a drain pipe for pouring water into the wedge-shaped hollow chamber. A series of flat vehicle running surfaces are formed on the upper side of the main body, and the lower surface of the wedge-shaped hollow chamber has an inclination close to a beach slope (approximately 1:7).

Embodiment The structure, operation, and effect of the embodiment of the present invention shown in FIGS. 1 and 2 will be explained in more detail below.

In the illustrated embodiment, the semi-floating pier 100 according to the present invention has a total length of 35 m, a width of 26.25 m, and a depth of 2.5 m.
The total weight of the upper deck 101 when fully loaded with earth and sand is 70 tons.
In order to have sufficient strength to withstand the travel of large dump trucks, which can reach up to 100 kg, thick steel plates are clad, and the hull body must also have a vertical rib structure to withstand this weight. A partition wall 102 is provided inside the main body, which allows a wedge-shaped hollow chamber 103 and a rectangular parallelepiped-shaped hollow chamber 1 to form the bow part.
It is divided into 04. Although not shown in the drawings, it is equipped with a pump and an inlet/drain pipe for injecting and discharging water into the wedge-shaped hollow chamber 103.

When using the semi-floating pier 100 according to the present invention, as shown in FIGS. 1 and 2, the bow portion (wedge-shaped hollow chamber portion) is ) is raised, water is injected into the wedge-shaped hollow chamber by a pump (not shown), and the bow section is submerged. Since the bottom surface of the bow section is given a slope approximately equal to the beach slope, the upper deck 101 of the semi-floating pier 100 remains approximately horizontal, and the stern section is still floating above the water.

In this state, the ear-shaped bar supports 105, 105, provided at the four corners of the semi-floating pier 100,
In the holes 106 and 106, there are rods 107 and 106, respectively.
107, 108, and 108, and position them by driving them into the seabed. Although the stern section may move up and down under the influence of the tide, this prevents it from rocking left and right about the bow section.

When the positioning of the semi-floated pier is completed, the earth and sand 22
A flap 23 is placed on top and connected to an earth transport vessel via a barge 30, and earth and sand is unloaded by a large dump truck.

The barge 30 includes a barge body 31 and a rampway 3.
2. The rampway is composed of hanging supports 33, and one end of the rampway 32 is engaged with the engagement portion of the flap 23, and the other end is engaged with the engagement portion of the earth carrier 10, respectively. Note that 41 in FIGS. 3 and 4 respectively indicate fenders, and it is desirable to use these fenders also in the embodiment of the present invention shown in FIGS. 1 and 2, but Not required.

When using the semi-floating pier of the present invention, since the lower surface of the wedge-shaped hollow chamber has an inclination close to that of a beach, it is difficult to carry out full-scale quay construction work during large-scale land reclamation work.
In order to avoid hindrance to land leveling work and building construction work in the area where the reclamation has been completed, it is possible to efficiently unload cargo by large earth carriers at the waterfront of the slope of the beach inside the frame, and to Since the floating pier is relatively easy to move, it has the advantage of being able to unload earth and sand while changing its installation location fairly frequently to avoid disturbing the strata, which can cause partial subsidence of the ground. .

The main body of the semi-floating pier of the present invention is divided into a rectangular parallelepiped-shaped hollow chamber and a wedge-shaped hollow chamber by a partition wall, and water is poured into the wedge-shaped hollow chamber by a pump and a drain pipe, so that the wedge-shaped hollow chamber is drained. After the shaped hollow chamber portion is pulled up to the shore, water is poured into the wedge shaped hollow chamber, and the height of the vicinity of the wedge shaped hollow chamber can be made to a height at which the truck can easily run on the flap 23. Since water can be selectively injected into the wedge-shaped hollow chamber by the partition wall without injecting water into the entire body, the height of the wedge-shaped hollow chamber can be changed with less water injection power and water injection time. Furthermore, when water is injected, the center of gravity of the main body moves closer to the wedge-shaped hollow chamber, reducing the swinging of the bow and making it easier for the bow to engage with reclaimed earth and sand.

[Brief explanation of drawings]

1 and 2 are a side view and a plan view, respectively, of an embodiment of the present invention, and FIGS. 3 and 4 are respectively views of a quay wall constructed by the prior art without using the semi-floating pier of the present invention. FIG. 2 is a side view and a plan view showing an example of unloading earth and sand. 100: Semi-floating pier, 102: Bulkhead, 103:
Wedge-shaped hollow chamber (bow section), 104: Rectangular hollow chamber (stern section).

Claims (1)

[Scope of Claims] 1. A main body divided by a partition into a rectangular parallelepiped-shaped hollow chamber and a wedge-shaped hollow chamber; and a pump and a drain pipe that supply water to the wedge-shaped hollow chamber; A semi-floating pier characterized in that an upper surface forms a series of flat vehicle running surfaces, and a lower surface of the wedge-shaped hollow chamber has an inclination close to that of a beach. 2. The semi-floating pier according to claim 1, further comprising ear-shaped bar supports projecting laterally at the four corners of the main body.