JPS62233322A - Method for continuous laying of plate drain on bottom under water - Google Patents

Abstract

PURPOSE:To exactly lay a plate drain on the bottom under water with high accuracy by a method in which plate drains are continuously laid on the bottom under water from a ship, and weights are charged onto the drains to press the drains stably on the bottom under water. CONSTITUTION:A plate drain D is set on a winding drum 3, and the portion sent out of the drain D is held on a roller 4 and inserted into a casing 5. The tip portion of the drain D is positioned on the lower end of the casing 5 and crushed stones G are loaded on a supply hopper 9. While operating a barge 1, the drain D is sent out from the lower end of the casing 5 and laid on the bottom under water. On the other hand, stones G discharged from the hopper 9 are sent to the back side on a belt conveyer 8, charged from a charging hopper 7 into a chute 6, and discharged from the lower end port onto the drain D just laid.

Description

[Detailed Description of the Invention] [Objective of the Invention 1] The present invention relates to a method for continuously laying plate-shaped drains on underwater ground on which vertical drains such as sand piles have been constructed. It is.

As shown in Figure 5, as a conventional method for improving the underwater ground on the seabed, etc., a sand pile 10 is constructed in the ground, and a drainage material such as a sand mat 11 is placed on top of the sand pile 10. 〃Approximately 1 due to cargo ships, sand removal ships, etc.

It is leveled to a thickness of 2 to 1.5 cm, and a load 12 of embankment etc. is applied on top of it to drain water in the soft ground into a sand pile 10
In addition to collecting water through the sand mat 11, the water was also drained through the sand mat 11.

However, the sand used for the sand mat 11 above is
Expensive, high-quality sand that is environmentally friendly and transportable.

It is becoming more and more difficult to secure this capacity year by year due to restrictions and other factors.

In addition, the sand mat 11 has poor construction accuracy,
Water pollution is likely to occur during construction, and the top finishing must be done underwater, which not only poses problems such as reduced work safety and efficiency, but also causes the sand mat to collapse as drainage work is repeated. However, there were problems such as the thickness becoming uneven and the function as a drainage material being deteriorated.

The present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to provide a plate-shaped drain that is inexpensive, has excellent drainage function, and does not deteriorate in drainage function even after long-term use. Another object of the present invention is to provide a method for continuously laying a plate-shaped drain underwater, which can be installed efficiently.

[Structure 1 of the Invention] JIU Tomo YujJ Saisu l Method 1 The method of continuously laying plate-shaped drains on the water bottom of the present invention is to continuously lay plate-shaped drains on the water bottom surface from a laying ship that moves straight ahead. In addition, the present invention is characterized in that a tweet member is dropped onto the plate-shaped drain to stably press the plate-shaped drain against the bottom surface of the water.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In Figure 1, 1 is the Hague as a laying ship,
A pedestal 2 is rotatably and slidably mounted on the I;. A winding drum 3 is mounted on the frame 2.
A plate-shaped drain D is wound around this. As shown in FIG. 2, for example, the plate-shaped drain D is composed of a core material d1 made of polyvinyl chloride or the like and molded into an uneven shape, and a filter d2 made of a high-strength nonwoven fabric and surrounding the core material d.

Note that the plate-shaped drain D used in the method of the present invention is not limited to this, and any drain material may be used as long as it is a plate-shaped material that can be rolled up.

A plurality of pairs of upper and lower rollers 4 are also disposed on the pedestal 2, so that the plate-shaped drain material pulled out from the winding drum 3 is sandwiched from above and below and sent rearward.

At the rear of the Hague 1, a casing 5 is installed vertically toward the water, and a plate-shaped drain material sent out from the rollers 4 is passed through the casing 5 and guided to the bottom of the water (seafloor) below. It is supposed to be done. In addition, the water resistance may be reduced by making holes in the casing 5 or by constructing the casing 5 with a wire mesh or the like.

As is clear from Figure 3, the casing 5 has a double cylindrical shape! The lower end of the fIt can be adjusted telescopically at a certain distance (for example, 50 cm) from the bottom of the water.
). A method for maintaining the lower end of the casing 5 at a constant position from the water bottom is to detect the water depth of the barge 1 using a water pressure sensor (not shown) or the like in response to changes in the water level (tide level), water bottom ground surface, etc. , Automatic expansion and contraction of casing 5! 4'J or
Alternatively, a grounding ring (not shown) may be attached to the lower end of the casing 5, and the grounding ring may be elastically biased so as to always be in rolling contact with the bottom surface of the water.

A chute 6 is provided along the back side of the casing 5, and the lower end of the chute 6 is configured to be flexible and expandable in the middle so that it can move up and down in accordance with the downward movement of the lower end of the casing 5. ing.

A charging hopper 7 is attached to the upper end of the chute 6, and crushed stone G sent from a supply hopper 9 via a belt conveyor 8 is charged into the chute 6.

Next, a method for laying the plate-shaped drain D on a predetermined water bottom using the laying device described in Section 2 will be explained.

First, the plate-shaped drain D is set on the winding drum 3, its unrolled portion is sandwiched between the rollers 4, and further inserted into the casing 5 so that its tip ya portion is exposed from the lower end of the casing 5. At the same time, crushed stone G is loaded into the supply hopper 9, and work preparation is completed.

Next, without operating the barge 1, the plate-shaped drain D is drawn out from the lower end of the casing 5 and laid on the bottom surface of the water.

On the other hand, the crushed 5G discharged from the supply hopper 9 is sent backward by the belt conveyor 8, is thrown into the chute 6 from the input hopper 7, and is discharged from the lower end of the chute 6 to the plate-shaped drain DJ: immediately after being laid. , the plate-shaped drain D is stably pressed against the bottom surface of the water.

In addition, if an opening/closing lid 6a is provided at the lower end of the chute 6 and the opening/closing lid 6a is configured to open and close intermittently, as shown in the figure, the crushed stone G will wobble and fall on the plate-shaped drain material. Although the plate-shaped drain material can be effectively pressed down at appropriate intervals, the present invention is not limited to this (although it is also possible to spread it out uniformly).

Further, the material for pressing down the plate-shaped drain D is not limited to the crushed stone G, but any loose weight member such as gravel, sand, ore can be used as long as it becomes a weight.

On the other hand, in order to lay the plate-shaped drain D straight on the bottom surface of the water, a sighting device (not shown) such as a light wave distance meter is set at a fixed position on land or water, and from now on, it is installed along the laying position. As well as firing the aim #aL,
The line of sight is received by a light receiver on the part 1, and if the axis of rotation 2' of the pedestal 2 on the part 1 deviates from the line of sight or the pedestal 2 is tilted, the axis of rotation 2' is set as the line of sight. line! , or correct the inclination of pedestal 2.
At the same time, the barge 1 is controlled so that the barge 1 is corrected in its trajectory so that the plate-shaped drain D is accurately laid along the line of sight.

Further, in the above embodiment, the plate-shaped drains D are laid in two rows with appropriate intervals, but the present invention is not limited to this, and it is possible to lay one row or three or more rows at the same time. The interval may also be changed. In addition, if the interval between each plate-shaped drain D is set slightly narrower than the rtl of the drain D, 1
After the first drain D is laid, a second drain D is laid between the two drains D, so that the drain can be laid without gaps as a whole.

[Effect of the invention 1: Plate-shaped drains are continuously laid out on the water bottom from a straight-moving laying ship, and weight members are dropped onto the plate-shaped drains to press the plate-shaped drains against the water bottom. Therefore, there is no water pollution during construction, and not only can plate-shaped drains be installed reliably and with high precision, but construction costs can be significantly reduced.

[Brief explanation of drawings]

Figure 1 is an external view of the laying equipment that implements the method of the present invention;
The figure is a perspective view showing an example of a plate-shaped drain, and Figure 3 is an enlarged perspective view of the r-lane casing and stone crushing chute, Pt5
FIG. 4 is a diagram for explaining the automatic II+ control method of the frame, and FIG. 5 is a diagram for explaining the conventional sand mat construction method. 1... Hardge, 2... Frame, 2a... Rotating shaft, 3
... Winding drum, 4... Roller, 5... Casing, 6... Chute, 6a... Opening/closing lid, 7...
Input hopper, 8... Belt conveyor, 9... Supply hopper, D... Plate drain, d,... Core material, d
2...filter! ,... line of sight.

Claims (2)

[Claims] (1) Platy drains are laid out in succession on the water bottom from a laying ship moving straight ahead, and a weight member is dropped onto the plate drains to stably hold the plate drains against the water bottom. A method for continuously installing a plate-shaped drain underwater. (2) The method for continuously laying a plate-shaped drain underwater as set forth in claim 1, wherein the weight members are dropped at intervals.