JPS6325124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of covering the backfilling rubble portion of a reclaimed seawall with a sheet material.

[Conventional technology] Conventionally, when reclaiming a coast, etc., an embankment consisting of concrete blocks or caissons was first constructed on the sea along the reclaimed area, and a backfilling rubble section was installed on the reclaimed side of the embankment. The method used is to construct a reclaimed seawall by covering the top surface and slope of the backfilling rubble section with a waterproof sheet to prevent the backfilling rubble section from collapsing due to tidal currents, waves, etc. This prevents hazardous substances from being washed away or from industrial waste thrown into the landfill.

Then, wave pressure and wind pressure from the sea side act over a wide range on the back surface of the sheet body through the gaps between the embankment body and the backfilling rubble, and as a result, the sheet body floats up and is agitated or damaged. Furthermore, the backfill rubble section may cause collapse of the slope. Therefore, there is also known a method of using a sheet body having through holes formed at appropriate locations for draining water and venting air (Japanese Utility Model Publication No. 138927/1983).

[Problems to be Solved by the Invention] However, although the above-mentioned through holes work effectively in normal cases, they mainly work poorly in cases where it takes a long time to complete the reclamation, or when the waves are rough due to a typhoon or strong wind. A large amount of air and seawater enters the backfilling rubble from gaps and voids in the embankment body above the water level and is forced into the backfilling rubble, especially above the low water level, creating a large amount of water pressure on the sheet body. It may be damaged by repeated fanning due to wind pressure. When the sheet body is damaged, the backfilling rubble is ejected from the damaged area along with air and seawater, or the backfilling rubble portion collapses, resulting in the formation of a cavity between the sheet body and the backfilling rubble portion, and further backfilling rubble. There were problems such as promoting the collapse of the department.

The present invention has been developed in view of the above, and is particularly suitable for backfilling rubble above the low water level when it takes a long time to complete the reclamation, or when the waves are rough due to a typhoon or strong wind. To provide a method for covering a backfilling rubble part in a reclaimed seawall that does not cause damage to the sheet body and collapse of the backfilling rubble part even if a large amount of air, seawater, etc. are forced in.

[Means for Solving the Problems] In order to solve the above problems, the method of covering the backfilling rubble part in the reclaimed seawall according to the present invention is such that the top surface on the reclaimed side of the embankment is approximately equal to the water level at low water level. forming a first backfilling rubble part so as to have the same height; covering the top surface of the first backing rubble section covered with the first sheet body when the reclamation is carried out to the vicinity of the slope shoulder of the first backfilling rubble section; The present invention is characterized in that it comprises forming a rubble-filling portion, and covering the top surface and slope of the second back-filling rubble portion with a second sheet body.

[Example] Next, the present invention will be explained based on examples.

The drawings show one embodiment of the present invention. First, as shown in FIG. A first backfilling rubble part 5 is formed along the wall surface 2 so that the top surface 3 is approximately at the same height as the water surface 4 at a low water level. Next, for example, thickness 1 to 6
A plurality of first sheets 8 having flexibility and sandproof properties made of soft polyvinyl chloride or canvas and having a width of 3 to 7 m and a length of 6 to 20 m are attached to the embankment body 1.
The top surface 3 of the backfilling rubble section 5 is connected sequentially in the longitudinal direction.
Also, the area from the slope 6 to the bottom 7 of the water is coated. At this time, for example, a fastener 9 is fixed to the wall surface 2 on the reclaimed side of the embankment body 1, and the end edge 10 of the first sheet body 8 on the embankment body 1 side is engaged with the rope 11. By forming a gap 12 between the wall surface 2 and the first sheet body 8, the first backfilling rubble portion 5 is formed while leaving a part of the top surface 3 on the embankment body 1 side. Cover. However, the means for preventing the first sheet body 8 from falling off is not limited to this. For example, the means for preventing the first sheet body 8 from falling off is not limited to this. It is also possible to use other methods, such as directly driving a pile with a head into the backfilling rubble portion 5. Incidentally, in the portion of the first sheet body 8 that covers the slope 6, a window hole 14 is formed which is closed by a valve plate 13 whose upper edge is fixed and which is movable up and down to open and close, as in the conventional case. You can also do that.

In general, when it takes a long time to complete the reclamation, such as when reclaiming over a wide area such as the coast,
Unless the reclamation work continues and is completed in a short period of time, it will be left in the state shown in Figure 1, but in that case, the water level will be lower than the water level 4 due to the effects of tides, etc. A small amount of air or seawater flowing downward into the first backfilling rubble section 5 under weak pressure is discharged to the landfill side 15 through the window hole 14 provided in the first sheet body 8, similar to the conventional one. Therefore, damage to the first sheet body 8 and collapse of the backing rubble portion 5 will not occur. Furthermore, even if a large amount of air or seawater enters the reclaimed side 15 through gaps in the embankment body 1 under high pressure due to changes in the water level due to the ebb and flow of the tide or waves caused by strong winds, the low water level affected by these changes will be affected. Since no backfilling rubble is formed in the part located above the embankment body 1 than 4,
Since air, seawater, etc. freely blow out to the landfill side 15, the first sheet body 8 is hardly affected by it, and the first sheet body 8 is agitated and damaged, or the first backfilling The rubble section 5 will not collapse. Furthermore, even if air, seawater, etc. with strong pressure near the water surface 4 at a low water level flows into the first backfilling rubble section 5, the first sheet body 8 will not be able to protect the top surface 3 and the wall surface 2 of the embankment body 1.
Since the backfilling rubble part 5 is covered with a gap 12 between the backfilling rubble part 5, it will be ejected from this gap 12 to the landfill side 15, which may damage the first sheet body 8 or damage the first backing. The rubble part 5 does not collapse.

Next, as shown in Figure 2, earth and sand 16 are placed on the reclaimed side 15.
When the soil is filled up to the vicinity of the shoulder 17 of the first backfilling rubble section 5, the first sheet body 7 is filled with earth and sand 16.
Since it is in pressure contact with the first back-filling rubble part 5 by the first back-filling rubble part 5, it will not be agitated by air, seawater, etc. entering the first back-filling rubble part 5.

When the reclamation work is to proceed further, as shown in FIG.
form 8. At this time, as shown in FIGS. 1 and 2, the portion of the first sheet body 8 to be laid on the top surface 3 of the first backfilling rubble portion 5 is made of the same material as the first sheet body 8. By attaching a buffer member 19 consisting of a plate having a corrugated shape or a plurality of protrusions, or a plurality of tubes arranged side by side, rubble can be thrown in to form the second backfilling rubble section 18. This can prevent the first sheet body 8 from being damaged.

Next, the top surface 20 and slope 21 of the second backfilling rubble section 18 are covered with the second sheet body 22. The second sheet body 22 is made of the same material as the first sheet body 8 and has an appropriate size, and is fixed by, for example, fixing its upper edge 23 to the top end 24 of the embankment body 1 with rivets 25 or the like. Then, like the first sheet body 8, a plurality of sheets are connected and laid in the longitudinal direction of the embankment body 1. At this time, it is desirable to lay it so that its lower edge overlaps the first sheet body 8. In addition, if the landfill is carried out immediately after laying, the second sheet body 2
The lower edge of 2 may be left as it is, but for example, a locking ring 27 is locked to a plurality of locking bodies 26 fixed to the lower end, and these are fixed in a line near the shoulder 17 of the first sheet body 8. The lower end edge of the second sheet body 22 is freely connected to the first sheet body 8 by connecting it via the connecting device 30 to the locking rope 29 which is wound and tensioned around the locking device 28. It is preferable to leave it there.
Normally, after this condition is formed, more earth and sand 31 is thrown in to complete the reclamation work in a relatively short period of time. Therefore, even if air or seawater flows into the second backfilling rubble section 18, it will be discharged from the gap between the overlapping lower edge of the first sheet body 8 and the second sheet body 22, so that the second sheet The repeated tension generated in the body 22 is small, it will not be greatly agitated and damaged, and the second backfilling rubble portion 18
will not collapse. In particular, when the lower edge of the first sheet body 8 and the second sheet body 22 are connected to each other as in this embodiment, damage to the second sheet body 22 and second backing rubble may occur. Collapse of the portion 18 can be further effectively prevented.

[Effects of the Invention] According to the present invention having the above configuration, the backfilling rubble part is formed in two parts and each part is covered with a sheet body, so when it takes a long time to complete the reclamation, Even if a large amount of air or seawater is forced into the backfilling rubble from gaps in the embankment body during rough waves due to typhoons or strong winds, damage to the sheet body and collapse of the backfilling rubble may occur. Without,
This makes it possible to maintain the reclaimed seawall in a predetermined shape, and also prevents the outflow of earth and sand thrown into the landfill and the outflow of hazardous substances from industrial waste.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1, 2, and 3 are process diagrams showing the coating method, and FIG. 4 is an enlarged partial plan view of FIG. 2. 1... Embankment body, 3... Top surface, 4... Water surface, 5...
First backfilling rubble part, 6...Slope, 8...First sheet body, 17...Slope shoulder, 18...Second backfilling rubble part, 20...Top surface, 21...Slope Face, 22...Second sheet body.

Claims (1)

[Claims] 1. Forming a first backfilling rubble section on the reclaimed side of the embankment body so that the top surface is approximately at the same height as the water surface at low water levels, and forming the top surface and slope of the first backfilling rubble section. Covering with the first sheet body leaving a part of the top surface on the embankment side, and covering with the first sheet body when the reclamation is carried out up to the vicinity of the slope of the first backfilling rubble section. forming a second back-filling rubble section on the top surface of the first back-filling rubble section; covering the top surface and slope of the second back-filling rubble section with a second sheet body; A method for covering a backfilling rubble part in a reclaimed seawall, characterized by comprising: