JPH03147920A - Horizontal burying method of drain material and burying device thereof - Google Patents

Abstract

PURPOSE:To make it possible to improve uniformly a poor subsoil by burying a drain material into the poor subsoil while moving forward a drain material burying guide at the buried starting end of the drain material and, at the same time, raising the drain material while moving forward the guide at the buried last end. CONSTITUTION:On the buried starting end side, a drawing frame 25B on the rear side is pulled out to pull a drain material buried guide 20 up to a poor subsoil 30, the drain material 16 is passed over a guide roll 22 to lead out, and a vacuum pulling hose is connected to the end of the drain material 16. Then, a drawing frame 25A on the front side is pulled out, the guide 20 is penetrated into the subsoil 30, and the drain material 16 is drawn out to bury it into the subsoil 30. After that, an operation ship 11 is advanced, and the drain material 16 is subsequently pulled out to bury. In addition, the advancement of the operation ship 11 is stopped at the position of the buried last end, a blank cap is loaded to the last end of the drain material 16, and the drawing frame 25A is pulled up to turn the guide 20 forward to pull it up to the subsoil 30.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a horizontal method for burying a plurality of drain materials at different heights in the horizontal direction in ultra-soft ground such as a dredged landfill or sludge treatment site. The present invention relates to a method for burying drain material and an apparatus therefor.

(Prior Art) Generally, when a pump dredger is used to dredge soft, viscous soil deposited on the bottom of a seabed or the like and then dump the dredged material into a landfill, extremely soft ground is formed. Conventionally, ultra-soft ground like this has undergone natural consolidation and then the next dredged soil is put in, or after natural consolidation has developed a certain degree of bearing capacity, drain materials are driven up and down, and weights such as sand are placed on top. The forced consolidation method described above was used.

With such methods, it takes a long time for natural consolidation, and it takes a long time to reach a state where conventional ground improvement methods can be implemented.

In view of this point, a ground improvement method was investigated in which a drain material was buried horizontally in the soft ground and the water in the soft ground was sucked out through the drain material, and a reel wound with the drain material 1 was developed as shown in Fig. 9. A drain material burying vessel 4 with a drain material embedding guide 3 protruding from which the drain material 1 is fed out under the bottom of the ship is floated on the water surface above the soft ground 5, and in the soft ground 5, The tip of the drain material l fed out from the drain material burying guide 3 is fixed to a fixing member such as a pile 6, and in this state, the drain material 1 is fed out from the drain material burying guide 3 while moving the drain material burying ship 4 and is buried horizontally. A method and apparatus for doing this have been developed (Japanese Patent Application Laid-Open No. 10813/1983).

(Problems to be Solved by the Invention) In such a conventional horizontal burying method of drain material, the drain material is buried continuously in a horizontal arrangement from the burying start end to the burying end position. As shown in Fig. 3, a part a where no drain material is buried between the start and end ends and the embankment 7a7b.

b is formed, and as a result, there are areas near the embankments 7a and 7b where no improvement effect is produced. For this reason, there was a problem in that the yield strength was uneven, which greatly hindered subsequent soil-covering operations.

In view of these conventional problems, the present invention provides a method for horizontally burying drain material, in which drain material can be buried at a uniform density even at the starting and ending ends of the drain material, and ground improvement can be performed uniformly over the entire area. The purpose is to provide buried equipment for the same.

(Measures 14 to Achieve the Problem) The feature of the method of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is to bury the drain material along the drain material embedding guide suspended below the bottom of the ship. Using a burying work boat that can freely deliver drain material to the required height position, advance through the soft ground with the drain material burying guide inserted into the soft ground, and drain the drain material as it progresses. In the method of burying horizontal drain material, the drain material burying guide is gradually moved from above the soft ground at the starting end position of the drain material. ! While burying it in the board, move it in the advancing direction, lower it to a predetermined depth, and then move it horizontally with the work boat, and at the end of the burying position, gradually raise and lower the drain material burying guide to the soft ground surface and advance. In particular, the feature of the present invention device is that the upper end is pivoted approximately at the center of the burying work vessel, which carries the drain material wound on a reel on the upper part, so as to be freely rotatable back and forth in the direction of movement of the burying work vessel. The drain material embedding guide is made to hang down, and drain material feeding parts are provided at a plurality of height positions of the drain material burying guide for sequentially feeding out the drain material pulled out from the reel, and the drain material burying guide is connected to
The present invention is provided with a drain material embedding guide attitude control means for forcibly rotating the A side forward and backward.

<Accompanying use> In the present invention, at the starting end of drain material burying, the drain material burying guide is rotated in the direction of movement of the drain material burying work vessel while the drain material burying vessel is stopped or slowly advanced. The length of the drain material is paid out one by one, and it is rotated and lowered on the forward fIA side to the desired depth for horizontal burial. At this time, a vacuum hose is connected in advance to the tip of the drain material so that the tip of the drain material is drawn out from a position slightly below the surface of the soft ground.

Next, in this state, the burying work boat is moved, and the drain material is paid out accordingly and buried horizontally. At the end of the burial, the drain material burying guide is rotated forward to rise above the soft ground while the burying work vessel is stopped or slowly moved forward, and the drain material is fed out as it rotates. The rear end is led out to a position slightly below the surface of the soft ground.

This operation is performed every time the burying work vessel makes a forward movement or a reciprocating movement, and the drain material is buried in the entire soft ground area.

Moreover, in this way, the end portions of the drain material are brought out near the ground surface at the start and end ends, so that the drain material can be buried without leaving any unburied portions.

(Example) Next, an example of implementation of the present invention will be described with reference to FIGS. 1 to 8. FIGS. 1 and 2 show an embodiment of the apparatus of the present invention, and in the figures, reference numeral 11 is a drain material burying work vessel in which the present invention is implemented. This burying work vessel 1 has a twin-hulled hull 12, and the hull 12 has a float 13 made of styrene foam or the like accommodated in a frame. A stabilizer 12a is protruded from the bottom of the hull 12 in the front-rear direction, and is propelled while penetrating the soft ground described later to maintain straightness.

A plurality of reels 14 are mounted on the upper surface of the hull 12.
It is rotatably mounted via the

Each reel 14 has a hollow drain material 1 made of nonwoven fabric, etc.
6 each are wound up. The drain material 16 is the third
As shown in the figure, it has a rectangular flat shape, and one end is 16
The A side is closed with two blind caps, and a vacuum hose 17 is connected to the base end 16B via a connector 18. A drain material buried guide 20 whose upper end is pivotally supported by a pivot 19 at the center of the hull is supported at the bottom of the hull 12 so as to be rotatable in the longitudinal direction of the hull 12 . This drain material embedding guide 20 has a guide body 21 made of a channel material or the like with an opening on one side, supported by a single pivot with the opening facing backward, and this guide body 21
Each drain material 16 guided through the inside is turned around by guide rolls 22 attached to the guide body 21 at different positions in the vertical direction and is fed out horizontally. That is, the vertical buried position of the drain material 16 is determined by the position of the guide roll 22.

A pair of posture control hands J-U 23A and 23B for guiding drain material embedding are provided at the front and rear of the hull 12. Each of the attitude control means 23A and 23B has a pivot 24 located at a position closer to the tip of the treetop than the center of the drain material embedding guide 20.
A, a drawing frame 25A whose tip is pivotally connected by 24B,
25B, and the rear end sides of the drawing frames 25A, 25B are pivotally supported at the front and rear of the hull 12.
It is slidably inserted into B. Each penetration pull-out frame 25A2
6B is not shown in detail in the figure, but is reciprocated in the axial direction by driving motors 27A and 27B via rack and pinion mechanisms, respectively.

The posture control means 23A, 23B pull up the front drawing frame 25A and push in the rear penetrating drawing frame 25B, thereby rotating the drain material embedding guide 20 forward, and vice versa. By pulling up the pull-out frame 25B and pushing in the penetrating pull-out frame 25A on the front side, the drain material embedding guide 20 is rotated to the rear side.

Next, an embodiment of the method of the present invention using the above-mentioned burying work vessel 11 will be described.

First, on the burying start end side, as shown in FIG.
Raise the material to above the soft ground 30 and remove each drain material 16.1.
6... are placed on the guide roll 22 and turned to lead out, and the vacuum hose 17 is connected to the tip of each drain material 16 via the connector 18, respectively.

Next, as shown in FIG. 5, the front drawing frame 25A is pulled up and the drain material embedding guide 20 is inserted until it is upright or close to it. At this time, each hose 17
Alternatively, by fixing each drain material 16 so that it is not drawn into the soft ground 30, each drain material 16 is paid out according to the penetration of the drain material embedding guide 20, and is inserted into the soft ground at the starting end of the burying along the front surface of the embankment 31a. It is buried in an arc shape.

With the drain material burying guide 20 penetrating in this manner, the drain material burying work boat 11 is advanced forward. This advancement is carried out, for example, by a winch installed on the shore.During this advancement, the drain material 16 is successively pulled out by the resistance of the soft soil and buried in the horizontal direction.

And embankment 31 on the opposite bank. Stop the progress of the burying work vessel 11 at the burying end position in front of b, leave each drain material I6 for the required length on board, and install a blind cap 2 at the end.
With the drain material installed, as shown in FIG. 6, pull up the front drawing frame 25A, rotate the drain material embedding guide 20 forward, and pull it up above the soft ground 30. As a result, the terminal end side is curved into an arc shape along the embankment 31b, and the embankment is buried with its tip reaching a position below the soft ground surface area.

The above-described operation completes the installation process. As a result, as shown in FIG.
6a and 16b are buried in an arc shape, and the drain material is buried uniformly without leaving any part without drain material at the beginning and end of the burial as in the conventional example described above.

In addition, at the beginning and end of the burial, drain material burial vessel 11
Drain material embedding guide 20 while moving the whole slowly
As shown in FIG. 8, the starting and ending portions 16a and 16b can be buried in a linearly descending and ascending manner.

Next, the burying work boat 11 is returned to its original position, moved horizontally by one pitch, and operated in the same manner as described above.This is repeated to bury the drain material at a constant pitch over the entire soft ground.

In addition, after the burying work is completed, the vacuum hose 17 is connected to a pressure reducing pump, and the pressure inside the drain material 16 is reduced to drain the soft ground 30.
The water inside is sucked out and the ground is improved.

(Effects of the Invention) As described above, in the method of the present invention, the drain material burying guide is moved forward at the burying start end of the drain material to be buried in soft ground, and at the same time, the drain material burying guide is moved forward at the burying end. By raising the embankment at the same time, the drain material is buried along the front of the embankment at the beginning and end, and the entire soft ground is improved uniformly, making subsequent treatment smooth and easy. You can proceed completely.

In addition, in the device of the present invention, the upper @ side of the drain material burying guide is pivotally attached to the center part of the hull so that it can be rotated in the front and back direction up to the soft ground, so that the burying work vessel can be moved from the beginning of burying to the end of burying. By simply rotating the drain material in the advancing direction, it is possible to bury the drain material without leaving any undamaged portions at both ends.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the apparatus according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a perspective view of the end of the drain material, and FIGS. 4 to 6 are each a method of the present invention. Fig. 7 and Fig. 8 are sectional views showing the buried state of the drain material, Fig. 9 is a side view of the conventional device, and Fig.
The figure is a side view of a drain material buried state using a conventional device. 11... Buried work boat, 12... Hull,
12a... Stabilizer, 13... Float, 14... Reel, 15... Bracket, 16... Drain material, I7...・
...X empty hose, 18...Connector, 19
...Principle, 20...Drain material embedding guide. 21... Guide body, 22... Guide roll, 23A, 23B... Attitude control means, 2
4A, 24B...Pivot, 25A, 25B...Drawing frame, 26A, 26B...Sliding guide tube, 27A, 2
7B...Motor 30...Soft ground, 31a, 31b...
·embankment.

Claims (2)

[Claims] (1) Using a burying work boat that can freely feed drain material to the required height position along a drain material burying guide suspended below the bottom of the ship, the drain material burying guide was inserted into the soft ground. In this horizontal drain material burying method, the horizontal drain material is moved through the ground and the drain material is paid out as it progresses, and the drain material burying guide is gradually moved from above the soft ground at the position of the burying start end of the drain material. While burying it in the ground, move it in the advancing direction, lower it to a predetermined depth, and then move it horizontally with the work boat, and at the end of the burial position, gradually raise and lower the drain material burying guide to the soft ground surface and advance. This is a method for horizontally burying drain material. (2) A drain material burying guide, whose upper end is pivoted so as to be rotatable back and forth in the direction of movement of the burying work boat, is suspended approximately at the center of the burying work boat with the drain material wound on a reel mounted on the upper part. , at multiple height positions of the drain material buried guide,
A drain material feeding section that sequentially feeds out the drain material pulled out from the reel is provided, and a drain material embedding guide posture control means for forcibly rotating the distal end side of the drain material embedding guide forward and backward. A horizontal burial device for drain material.