JPS58168734A - Reclamation work - Google Patents

Abstract

PURPOSE:To effectively perform a reclamation work by a method in which a temporary wharf is provided in a reclamation site, a barge with a ramp-way is provided on the front of the temporary wharf, and soil and sand are delivered through the ramp-way from an earth-carrying barge to the reclamation site by a dump car. CONSTITUTION:A barge 31 with fenders 41 and 42 are provided to the front of a temporary wharf 20 made of sheet piles 21. When a earth-carrying barge 10 comes into contact with the barge 31, a ramp-way 32 supported by struts 33 and 34 is hooked and fixed to the flap 23 of the temporary wharf 20 and the earth-carrying barge 10. The soil and sand are loaded on a dump car running on the deck 2 of the barge 10 and dumped to a reclamation site through the ramp- way 32. Since the barge 31 vertically moves even when the sea surface is changed up and down by the ebb and flow of tide the dump car can easily pass through the ramp-way because the inclination of the ramp-way is only changed, and therefore, the reclamation work can be effectively attained.

Description

[Detailed Description of the Invention] The present invention involves loading earth and sand onto an earth transport vessel at an earth and sand loading site,
This relates to a method of reclamation by transporting top sand to a reclamation point and dropping earth and sand at the reclamation point.

For example, when reclaiming a part of the sea to create a new artificial island, or creating a reclaimed land that is connected to land and connected to the sea, the following procedure is usually followed.

(1) Build an outline of the planned landfill site, a so-called picture frame, using steel sheet piles, etc.

(2) An open-bottom earth carrier is brought in and out of the planned reclaimed area formed by the picture frame through the unfinished part of the picture frame, and the soil is sunk into the planned reclaimed area, gradually making it shallower. .

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

(4) Earth and sand are transported by a large open-bottomed earth carrier, and the inside of the picture frame is filled with earth and sand using clamshells, backhoes, etc., gradually expanding the land area in front of the picture frame.

(5) Once a certain amount of land has been formed in front of the frame, begin full-scale construction of the quay outside the frame. Reclamation within the frame will continue in parallel with quay construction.

Land reclamation work is usually carried out in more than 0 steps, so after the full-scale construction of the quay outside the frame has begun, it is not desirable in terms of construction efficiency to use the quay for berthing for unloading of earth-carrying vessels. do not have. Furthermore, inside the picture frame, a slope of about 1 nia is naturally formed from the reclaimed land to the seabed, so the water depth is shallow, making it difficult to use large earth carriers. Therefore, using small earth transport vessels, 7
Therefore, inefficient land reclamation work had to be carried out.

The present invention relates to a new reclamation method that eliminates the drawbacks of the conventional methods described above and enables highly efficient reclamation work using large earth carriers.

Hereinafter, the reclamation method according to the present invention will be explained with reference to the illustrated embodiments.

1 and 3 are plan views showing different examples of earth transport vessels suitable for use in carrying out the present invention, FIGS. 2 and 4 are side views of the earth transport vessels, and FIG. 5 1 and 2 are enlarged cross-sectional views taken along the line V-■ of the earth carriers shown in FIGS. 1 and 7, respectively.

In conventional construction methods, only small earth-carrying vessels can be used due to limitations imposed by water depth, whereas in the present invention, even fairly large earth-carrying vessels can be used to carry out efficient construction work. be able to. The illustrated soil transport vessel 10 has a length of approximately i
The ship has a width of about 25 m and a height of about 6 m, and a wide deck 2 is provided around the earth and sand section 1 to allow a dump truck to run on it.

FIG. 6 is a diagram showing the relationship between the temporary quay 20, the barge O, and the stern portion of the earth carrier 10 (FIGS. 6 and 4) used for carrying out the present invention when berthed.

The quay wall 20 includes a vertical wall 21 constructed by driving steel sheet piles 21, for example, and a flap 26 placed on reclaimed earth and sand 22. It is also possible to replace it with steel sheet piles, corrugated cells, etc. In addition, 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 main body 31. The rampway 32° is made up of rampway hanging supports 33 and 4. One end of the rampway 2 is engaged with the engaging portion of the flap 23, and the other end is engaged with the engaging portion of the earth carrier.

41 and 42 respectively indicate fenders, but it is not essential to provide these.

In FIG. 6, the barge 31 has a width of approximately 30 m.

The length of the rampway 32 is approximately IDm, the thickness is approximately 15m, and the length of the rampway 32 is approximately 15m, and its height is adjustable.

Figure 6 shows an earth-carrying ship full of earth and sand docked at low tide, and the rampway is tilted approximately 15 degrees downward from the temporary quay towards the earth-carrying ship. When the cargo is finished and empty, the stifle rises by approximately 3.5 meters. Also, assuming that the water level difference between low tide and high tide is 2 m, when the earth transport ship approaches the shore at high tide with no cargo, the deck of the earth transport ship will rise approximately 5.5 m compared to the case shown in the figure, so the ramp will be inclined approximately 15° in the direction of the temporary quay. It is convenient to design the slope of the ramp way so that it does not exceed 15 degrees in any case, when a dump truck enters and exits the cargo ship. It is not uncommon for the temporary wharf to be repositioned at any time, so it is desirable for the efficiency of the reclamation work to change the location of the temporary quay from time to time. Therefore, when the steel sheet pile used as a vertical wall is removed, the earth and sand collapses, creating a so-called Nagisa slope, which is usually 1-nea.

Therefore, when constructing a new temporary quay, if steel sheet piles are to be driven in at a water depth of 1rrL at low tide, the bottom of the earth-carrying vessel shown in Figure 4, which is fully loaded with earth and sand, should be placed near the stern of the deepest part of the bottom. Since part A is about 4.5m below the catchment water, this part A is at least (4.5m - 1m) x 7 = 24.
It is preferable to determine the shape of the stern so that it is 5 meters apart. However, at high tide or when the water is deep enough, as shown in Figures 1 and 2, the side of the ship is moored to a temporary quay, and a barge equipped with multiple ramps is used to prevent landslides. Needless to say, it can improve efficiency.

The dimensions illustrated above are merely used to facilitate understanding of one embodiment of the present invention, and it goes without saying that the technical scope of the present invention is not limited by these numbers.

[Brief explanation of the drawing]

Figures 1 and 3 are plan views showing different examples of earth transport vessels used to carry out the reclamation method of the present invention, and Figures 2 and 4 are
The figure is a side view of each of them. Figure 5 is an enlarged sectional view taken along the line ■-■ in Figure 1 or Figure 3, and Figure 6 is a schematic diagram showing the state of the soil transport vessel berthed. 10: Earth carrier 20: Quay Wall 2ro: Two flaps 30 Boat 32: Rampway

Claims (1)

[Scope of Claims] 1. An earth transport ship that sails back and forth between an earth and sand loading site and a reclaimed land is an earth transport ship that is equipped with an earth and sand loading section and a deck section on which a dump truck can run. The reclaimed land has a temporary vertical wall that can at least temporarily prevent the reclaimed soil from collapsing into the water, and a temporary vertical wall that is placed on the surface of the soil that is prevented from collapsing by the temporary vertical wall. A temporary quay consisting of a flap having a rampway engagement part is provided; when the earth transport vessel unloads the loaded earth and sand to the reclaimed land, a barge that supports the rampway so as to be adjustable up and down is installed on the temporary quay. and a large earth carrier, and one end of the ramp supported by the barge is engaged with the rampway engaging portion of the flap, and the other end is engaged with the side or stern of the earth carrier. A reclamation method characterized in that: the temporary quay and the earth transport vessel are connected by the temporary quay and the earth and sand are unloaded by the dump truck.