JPH0786221B2 - Horizontal drainage equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drain material horizontal embedding device for horizontally embedding a drain material in ultra-soft ground such as a landfill due to dredging or sludge treatment land.

(Prior Art) Generally, when the soft cohesive soil deposited on the bottom of the sea such as the bottom of a dredger is dredged into a landfill, an ultra-soft ground is formed. Conventionally, such ultra-soft ground has been subjected to forced consolidation in which the next dredged soil is introduced with natural consolidation, or after a certain amount of proof stress has been developed due to natural consolidation, the drain material is driven up and down, and weights such as sand are placed on it. The method 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 a horizontal drain material is embedded in soft ground and water in the soft ground is sucked through the drain material has been studied, and as shown in FIG. 7, the reel 2 wound with the drain material 1 is wound. The drain material embedding vessel 4 in which the drain material embedding guide 3 for projecting the drain material 1 under the bottom of the ship is projected on the water surface on the soft ground 5, and the drain material is placed in the soft ground 5. The buried guide is inserted, the end of the drain material pulled out from the guide is fixed to the fixing member 6, and in this state, the drain material buried ship 4 is moved while the drain material buried guide 3 is drained from the drain material 1
A device for horizontally burying the same while feeding it has 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 (1), 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 cannot be improved. For this reason, there is a problem in that the yield strength becomes uneven and the work such as covering the soil thereafter is greatly hindered.

In view of such a conventional problem, the present invention is capable of burying the drain material at the embedding start end and the terminal end side of the drain material up to the embankment respectively, and a horizontal embedding device for the drain material in which ground improvement is uniformly performed over the entire area. It is intended to be provided.

(Means for Solving the Problem) The feature of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is that the drain material hangs down below the bottom of a work vessel for burying drain material, and A drain material burying guide to be inserted into the drain material burying guide, and a drain material burying guide having a drain material feeding part, wherein the drain material burying guide has the above-mentioned tip at the ground insertion side. A drain material feeding portion is provided, and the drain material embedding guide is supported so as to be rotatable in the front-back direction with respect to the hull with respect to the hull, and to be able to move in and out in the longitudinal direction.
The hull is provided with a rotation drive means for rotating the drain material burying guide and an in-out drive means for moving the drain material burying guide in and out in the longitudinal direction.

(Operation) In the present invention, the drain material burying guide is projected below the bottom of the ship, and the drain material burying height in the soft ground is set by adjusting the protruding length, and the hull is moved forward while feeding the drain material. By advancing, the drain material is buried horizontally.

In addition, the drain material embedded guide can be moved in and out in the longitudinal direction,
In addition, since it is rotatable in the front-rear direction, the tip end portion with the drain material feeding portion can be moved from the lower rear portion of the hull to the lower front portion of the hull, and the drain material feeding portion is positioned below the rear portion of the hull at the buried start position. By doing so, it is possible to bury from a position close to the shore of the embankment, and at the end of the burying, by moving the drain material feeding section below the front of the hull, it can be buried to a position close to the shore of the embankment.

Further, at the embedding start end and the terminating end, the embedding height of the embedding start end and the terminating end can be made the same as that of the central portion by rotating the drain material embedding guide while drawing or moving it in the projecting direction.

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3 show the outline of the entire apparatus,
In the figure, 11 is a drain material burying work ship. 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 reel 14 is rotatably mounted on a top surface of the hull 12 via a bracket 15.

A hollow drain member 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. 4, one end 16A side is closed by a blind cap 29, and a vacuum hose 17 is connected to the base end 16B via a connector 18. It is like this.

A drain material burying guide 20 is provided at the center of the front of the hull 12.
It is supported so as to be rotatable in the front-rear direction and to be able to move in and out in the longitudinal direction. The drain material embedded guide 20 is configured such that a guide body 21 made of a channel material or the like having an opening on one side is supported with its opening facing rearward, and each drain material 16 guided through the inside of the guide body 21 is A guide roll 22 attached to the tip of the guide main body 21 changes the direction, and the structure is such that the guide roll 22 is horizontally extended.

The drain material embedded guide 20 is a rectangular tube-shaped guide support tube 23.
It is slidably inserted in the inside and supported.
The guide support cylinder 23 is attached to the hull 12 via a bracket 24 so as to be rotatable about a horizontal shaft 25 in the ship width direction. As a result, the drain material burying guide 20 is rotated toward the ship bottom side from between the catamaran of the hull, and at the same time, can be moved in and out in the longitudinal direction.

Further, the drain material burying guide 20 is rotated by the rotation driving means to change the inclination angle in the front-rear direction, and is also moved in and out in the longitudinal direction by the movement driving means.

The rotation driving means is composed of a pair of front and rear winches 26a, 26b and pulling wires 27a, 27b wound by the winches 26a, 27b. The feeding end side of the material embedding guide 20 is moved forward, while the wire 27a of the front winch 26a is fed out while the rear winch is being fed.
The wire 27b is wound by 26b so that the feeding end side is moved backward. By the hoisting of the rear winch 26b, the drain material burying guide 20 is
As shown by the phantom line in FIG. 2, it is operated until it is oriented horizontally.

Further, the in-and-out drive means is composed of upper and lower winches 28a and 28b supported by the guide support cylinder 23, and pulling wires 29a and 29b wound by the winch 28a and 28b, and from the upper winch 28a while feeding out the wire 29b of the lower winch 28b. The drain material burying guide 20 is wound by winding the wire 29a connected to the drain material feeding side end of the drain material burying guide 20.
Of the winch 28a, while the wire 29a of the winch 28a is unwound and the wire 29b connected to the drain material feeding end side of the drain material embedded guide 20 is wound up, the guide 20 is slid to the pull-in side. It is like this.

Next, an example of burying operation of the horizontal drain material by the above-mentioned device will be described.

First, on the buried end side, as shown in FIG. 5A, the inclination angle and the protruding length are adjusted so that the feeding end of the drain material buried guide 20 is located below the rear part of the hull, and the connector is attached to the tip of the drain material 16. A vacuuming hose 17 is connected via 18 As a result, the tip of the drain material 16 is led out to a position close to the embankment 7a at the beginning of burying.

In this state, as shown in FIG. 5 (b), the drain material-embedded work boat 11 is moved forward while feeding the drain material 16. As a result, the drain material 16 is horizontally embedded in the soft ground 5 at the drain material feeding portion height.

Then, at the burying end position on the entire surface of the embankment 7b on the opposite side, the operation of the burying work vessel 11 is stopped and each drain material 16
With the required length left, and with the blind cap 29 attached at the end as shown in FIG. 4, rotate the drain material burying guide 20 in the upright direction while pulling in the drain material burying guide 20 as shown in FIG. 5 (c). , The drain material feeding portion is moved forward without changing its height. As a result, the drain material 16 is buried to a position close to the opposite bank.

When the thickness of the soft ground layer is large, the height is different and the above-described embedding operation is performed a plurality of times from the lower side to embed the drain material 16 in multiple stages as shown in FIG.

(Effects of the Invention) As described above, in the drain material horizontal embedding device of the present invention, the drain material embedding guide is movable in the longitudinal direction and is rotatable in the front-rear direction, thereby embedding the embedding work boat. The drain material burying guide is rotated at the start end and the terminal end, and the drain material can be horizontally buried without leaving unmodified portions at both ends by a simple work of moving in and out.

[Brief description of drawings]

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 front view of the same, FIG. 4 is a perspective view of an end portion of a drain member, and FIG. ) To (c) are side views showing respective steps of the drain material burying example, FIG. 6 is a cross-sectional view showing a buried state of the drain material, FIG. 7 is a side view of a conventional apparatus, and FIG. 8 is a drain by the conventional apparatus. It is a side view of a material burial state. 11 …… Buried work boat, 12 …… Hull, 12a …… Stabilizer, 13 …… Float, 14 …… Reel, 15 …… Bracket, 16 …… Drain material, 17 …… Vacuum hose, 18 ……
Connector, 20 …… Drain material embedded guide, 21 …… Guide body, 23 …… Guide support tube, 24 …… Bracket, 25 ……
Horizontal axis, 26a, 26b …… Front and rear winches, 27a, 27b, 29a, 29b…
… Wires, 28a, 28b …… Upper and lower winches, 7a, 7b… Embankments.

Claims (1)

[Claims] 1. A horizontal drain material, which comprises a drain material burying guide that is hung below the bottom of a drain material burying work ship and is inserted into soft ground, and the drain material burying guide has a drain material feeding portion. In the burying device, the drain material burying guide is provided with the drain material feeding portion at a tip portion on the ground insertion side thereof, and the drain material burying guide is rotatable in the front-rear direction on the tip side with respect to a hull. Further, the hull is supported so as to be able to move in and out in the longitudinal direction, and the hull is provided with a rotation driving means for rotating the drain material burying guide, and an in / out driving means for moving the drain material burying guide in the longitudinal direction. Horizontal burying device for drain material.