JPH0670322B2 - Horizontal burying method for drain material and burying apparatus therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a horizontal method for embedding a plurality of drain materials at different heights in the horizontal direction in ultra-soft ground such as a landfill due to dredging or sludge processing land. The present invention relates to a method for burying a drain material and an apparatus for the method.

(Prior Art) Generally, when a soft dredged soil deposited on the bottom of a sea such as a seabed is dredged into a landfill by a pump dredger, an ultra-soft ground is formed. Conventionally, such ultra-soft ground has natural consolidation, and the next dredged soil is thrown in, or after a certain amount of proof stress has been developed due to natural consolidation, the drain material is driven up and down and a weight such as sand is placed on it. The forced consolidation method used was adopted.

In such a method, it takes a long time for natural consolidation, and it takes a long time before the conventional ground improvement method can be applied.

Considering this point, a method for ground improvement in which the drain material is horizontally embedded in the soft ground and the water in the soft ground is sucked through the drain material has been studied. As shown in FIG. 2 is mounted on the ship, and a drain material embedding vessel 4 having a projected drain material embedding guide 3 for feeding the drain material 1 underneath the ship bottom is floated horizontally on the soft ground 5, and in the soft ground 5, The tip of the drain material 1 fed 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 burying ship 4 is moved while the drain material 1 is fed from the drain material burying guide 3 to be horizontally buried. A method and apparatus for performing the above have been developed (Japanese Patent Laid-Open No. 64-10813).

(Problems to be Solved by the Invention) In such a conventional horizontal burying method for the drain material, the drain material is continuously laid horizontally in a horizontal arrangement from the burying start end portion to the burying end portion. As shown in Fig. 5, there are portions a and b in which the drain material is not buried between the start end and the end to the embankments 7a and 7b, and therefore, portions near the embankments 7a and 7b have no improvement effect. For this reason, there is a problem in that the yield strength becomes uneven, and the subsequent work such as covering the soil is greatly hindered.

In view of such a conventional problem, the present invention is capable of burying the drain material at a uniform density even at the burying start end and the terminating end of the drain material, and a horizontal burying method for the drain material in which ground improvement is uniformly performed over the entire area. And the purpose of providing the buried device.

(Means for Achieving the Object) The features of the method of the present invention for solving the above-mentioned conventional problems and for achieving the intended purpose are required along with a drain material burying guide that is hung below the ship bottom. The draining material can be fed out to a different height position, and the draining material embedded guide is inserted into the soft ground to advance through the ground, and the draining material is fed out along with the progress. In the method of burying a horizontal drain material, the drain material burying guide was gradually moved toward the advancing direction side while being buried in the ground from above the soft ground at the burying start end position of the drain material, and lowered to a predetermined depth. In this state, it is moved horizontally with the work boat, and at the end position of burial, the drain material burying guide is gradually moved up and down to the surface of the soft ground, and the feature of the device of the present invention is as follows. A drain material embedding guide having an upper end rotatably rotatably pivoted forward and backward in the advancing direction of the buried work vessel is hung at approximately the center of the buried work vessel in which the drain material is wound around a reel. A drain material feeding portion that sequentially feeds the drain material drawn from the reel is provided at a plurality of height positions of the material embedding guide, and the tip end side of the drain material embedding guide is forcibly rotated forward and backward. This is because the drain material burying guide posture control means is provided.

(Operation) In the present invention, at the starting end of the drain material burial, the drain material burial vessel is stopped or slowly moved forward while the drain material burial guide is pivoted toward the traveling direction side of the burial work vessel, and its rotation length is increased. The drain material for that amount is sequentially fed out, and the tip side is pivoted down to the depth at which it is about to be embedded horizontally. At this time, a vacuum drawing hose is connected to the tip of the drain material in advance so that the tip of the drain material is fed out from the soft ground surface from the baffle position.

Then, the burial work boat is moved in this state, and the drain material is fed out in accordance therewith and horizontally buried. At the terminating end of the burial, while stopping the burial work boat or slowly advancing it, the drain material burial guide is rotated forward and raised to above the soft ground. The rear end is led out to the position of the lower part of the surface soil on the soft ground.

Such an operation is performed for each forward or reciprocating operation of the buried work ship, and the drain material is buried in the entire soft ground.

In this way, the drain material ends are led out near the ground surface at the starting end and the terminating end, so that the drain material is buried without leaving unfilled portions.

(Embodiment) An embodiment of the present invention will be described with reference to Figs. 1 and 2 show an embodiment of the apparatus of the present invention. In the drawings, 11 is a drain material burying work ship embodying the present invention. This buried work boat 11 has a catamaran-type hull 12, and the hull 12 is configured by accommodating a float 13 such as Styrofoam in a frame body. A stabilizer 12a is projected on the bottom of the hull 12 in the front-rear direction, and the straightness is maintained by propelling the stabilizer 12a while penetrating it into a soft ground described later.

A plurality of reels 14 are rotatably mounted on a top surface of the hull 12 via brackets 15.

A hollow drain material 16 made of non-woven fabric or the like is wound around each reel 14. The drain member 16 has a rectangular flat shape as shown in FIG. 3, one end 16A side is closed by a blind cap 29, and the base end 16B has a vacuuming hose 17
Are connected via a connector 18. At the bottom of the hull 12, a drain material embedded guide 20 having an upper end pivotally supported by a pivot part 19 in the center of the hull is rotatably supported in the front-rear direction of the hull 12. This drain material burial guide 20
Is a guide body made of channel material with one side open.
21 is supported by a pivot portion 19 with its opening facing rearward, and each drain member 16 guided through the inside of the guide body 21 is attached to the guide body 21 at vertically different positions. The structure is such that the direction is changed by and it is extended horizontally. That is, the position in which the drain member 16 is embedded in the vertical direction is determined by the position of the guide roll 22.

At the front and rear of the hull 12, a pair of attitude control means 23A, 23B for guiding the drain material burying are provided. Each of the attitude control means 23A, 23B has withdrawal frames 25A, 25B whose tip ends are pivotally attached by pivot shafts 24A, 24B at a position on the tip side of the drain material embedding guide 20 from the center thereof. , 25B, the rear end side of which is a sliding guide tube 26A pivotally supported on the front and rear of the hull 12.
It is slidably inserted in 26B. Each penetration drawing frame 25A, 25B
Although not shown in detail in the figure, the motors 27A and 27B are respectively driven via a rack and pinion mechanism to reciprocate in the axial direction.

Thus, the attitude control means 23A and 23B are the front extraction frames 25A.
, The drain material embedded guide 20 is rotated to the front side by pushing in the rear side intrusive pull-out frame 25B, conversely pulling up the rear side inward pull-out frame 25B, and pushing in the front side intrusive pull-out frame 25A, The drain material burying guide 20 is adapted to be rotated rearward.

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

First, on the burial start end side, as shown in FIG. 4, the drawing frame 25B on the rear side is pulled up to pull up the drain material burying guide 20 onto the soft ground 30, and each drain material 16, 16 ... Is hung on the guide roll 22. It is rotated and led out, and a vacuum hose 17 is connected to the tip of each drain member 16 via a connector 18.

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

In this way, the drain material burying work vessel 11 is moved forward with the drain material burying guide 20 being inserted. This process is performed by a winch installed on the shore as an example.
Along with this progress, the drain member 16 is sequentially pulled out by the resistance of the weak man and is buried in the horizontal direction.

Then, at the burying end position on the front side of the embankment 31b on the opposite side, the operation of the burying work vessel 11 is stopped, and each drain material is onboard.
While leaving 16 as long as necessary, with the blind cap 29 attached at the end, pull out the front extraction frame 25A to rotate the drain material burying guide 20 to the front side as shown in FIG. 30 Pull up. As a result, the terminal side is curved in an arc shape along the embankment 31b, and the tip is buried in a state where the tip reaches the lower part of the soft ground surface culvert.

The above-mentioned operation completes one burying process. As a result, as shown in FIG.
The 16b is buried in an arc shape, so that it can be uniformly buried without leaving a portion without a drain material at the starting and terminating ends of the embedding as in the above-described conventional example.

At the start and end portions of the burial, the drain material burying guide 20 is inserted while slowly moving the entire drain material burying vessel 11, so that as shown in FIG.
It is also possible to bury the 16b as if it were lowered and raised linearly.

Then, the burying work boat 11 is returned to the original position, laterally moved by one pitch, and operated in the same manner as described above. By repeating this, the drain material is buried at a constant pitch on the entire soft ground.

After the burying work is completed, the vacuum hose 17 is connected to a decompression pump to depressurize the drain material 16 to suck out the water in the soft ground 30 to improve the ground.

(Effect 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 while being laid in the soft ground, and the drain material burying guide is moved forward at the burying end. By doing so, the drain material will be buried along the front surface of the embankment at the start and end portions, and the entire soft ground will be improved uniformly, and the subsequent processing will be smooth and You can proceed completely.

Further, in the device of the present invention, the upper end side of the drain material burying guide is pivotally attached to the center portion of the hull so that the drain material burying guide can be rotated in the front-rear direction onto the soft ground. By the simple operation of rotating the drain material in the traveling direction side, the drain material can be buried without leaving unmodified portions at both end positions.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of an apparatus according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a perspective view of an end portion of a drain material, and FIGS. FIG. 7 is a side view showing the steps of embodying 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 apparatus, and FIG. It is a side view of a state. 11 …… Buried work boat, 12 …… Hull, 12a …… Stabilizer, 13 …… Float, 14 …… Reel, 15 …… Bracket, 16 …… Drain material, 17 …… Vacuum hose, 18 …… Connector, 19 ... Pivot support, 20 ... Drain material embedding guide, 21 ... Guide body, 22 ... Guide roll, 23A, 23B ... Posture control means, 24A, 24B ... Axis, 25A, 25B ... Pull-out frame, 26A, 26B …… Sliding guide tube, 27A, 27B …… Motor, 30 …… Soft ground, 31a, 31b …… Embedment.

Claims (2)

[Claims] 1. A buried work boat in which a drain material can be fed to a required height position along a drain material buried guide that hangs downward from a ship bottom, and the drain material buried guide is inserted into soft ground. In the method of embedding a horizontal drain material that advances in the ground in such a state that the drain material is fed along with the progress, the drain material embedding guide is gradually removed from the soft ground at the embedding start end position of the drain material. While moving in the direction of travel while being embedded in the ground,
A horizontal burying method for a drain material, characterized in that the drain material is horizontally moved together with the work boat while being lowered to a predetermined depth, and the drain material burying guide is gradually moved up and down to the surface of the soft ground at the burying end position. 2. A drain material burying guide having an upper end pivotally attached to the front and rear in the traveling direction of the burying work ship at approximately the center of the burying work ship having a drain material wound around a reel on the upper part thereof. The drain material embedding guide is provided at a plurality of height positions of the drain material embedding guide, and the drain material embedding part for sequentially dispensing the drain material drawn out from the reel is provided. A drain material horizontal burying device comprising a drain material burying guide posture control means for forcedly rotating the drain material.