JPH09279564A - Laying method of horizontal drain material and laying work vessel therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably lay sheets on the bottom of water by sinking and arranging a drain sheet having weight on the bottom of water through an opening of a work vessel, and laying plural sheets according to an advance of a work vessel. SOLUTION: After a work vessel S is moored to a prescribed area by a vessel mooring device 12, a carriage 5 is moved forward by actuating a driving device 18. Next, a horizontal drain material 6 is rolled up and unfolded up to a specific length on the carriage 5 from a horizontal drain material supply device 7, and a drain sheet D having a weight material is manufactured. Next, after being positioned on an opening 2 of a hull part 1 by moving the carriage 5 backward, a hanging-down frame 29 is lowered by actuating a winch of a gate-shaped crane part 28 of a hanging-down device 10, and the sheet D is gripped by a gripping device. After the carriage 5 is moved forward, the frame 29 is lowered, and the sheet D is sunk underwater. A winch of the ship mooring device 12 is actuated, and the sheet D is laid on the bottom of water while advancing the work vessel S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously laying a flat plate-shaped horizontal drain member on the bottom of a water surface, and a laying work boat used to carry out the method.

[0002]

2. Description of the Related Art In order to improve soft ground at the bottom of the water, it is known that vertical drain materials such as sand piles are vertically driven in a soft ground layer at a predetermined interval and horizontal drain materials are laid on the surface layer. In recent years, it has been attempted to use a plate-shaped drain material composed of a public drain as a core material and a filter material surrounding the public drain as the horizontal drain material. For the public drain and the filter material, synthetic resin is preferably used as the material. Then, a laying work boat is used for laying the horizontal drain material on the bottom of the water, but in the conventional laying work, the horizontal drain material wound up in a roll on the laying work ship is simply fed out to After landing on the bottom, a means for placing gravel, sand, etc. on the horizontal drain material is adopted. Alternatively, a means for feeding and laying a horizontal drain material to which a fixing member serving as a weight is previously attached may be adopted. However, with either of the former and latter methods, various disturbance factors occur until the horizontal drain material reaches the bottom of the water as the work boat progresses, and it is difficult to lay it as desired and the reliability of construction is poor. ,
In addition, the horizontal drain material will be broken. Therefore, in the former method, therefore, it is necessary to make the strength of the horizontal drain material greater than necessary, and in the latter method, the drive device for the wound horizontal drain material is driven. There is a problem that it is necessary to increase the power and the equipment cost increases.

Therefore, the present applicants have previously proposed Japanese Patent Application No. 6-
No. 334244 (prior invention), a horizontal drain material laying method and its laying work boat that are not affected by the sway accompanying the progress of the work boat and can efficiently lay the horizontal drain material on the water bottom as desired are proposed. .

[0004]

DISCLOSURE OF THE INVENTION The present invention is a further development of the invention of the earlier application, and is capable of laying a horizontal drain member on the bottom of the water more accurately without being affected by the shaking caused by the progress of the work boat. At the same time, it is an object of the present invention to provide a method for laying a horizontal drain material without uneven settlement of the horizontal drain material after laying, and a laying work ship therefor.

[0005]

The present invention specifically has the following configuration. That is, the first invention is a method for laying a horizontal drain material, in which a stacking margin is secured on a rectangular flat sheet made of the horizontal drain material on a work boat having an opening of a certain width formed in the hull. And fixing the weight material to produce a drain sheet with the weight material, the drain sheet with the weight material is sunk to the water bottom through the opening of the work boat, and the drain sheet with the weight material is advanced as the work boat advances. It is characterized in that a plurality of drain seats with weight materials are laid through the overlapping margins. In the above configuration, the weight material has a tubular shape and the net body contains coarse aggregate such as gravel or crushed stone, or the net body contains fine aggregate such as sand. A second invention is also a method for laying a horizontal drain material, which is characterized in that, in addition to the above configuration, the drain seat with weight material is hung and held by a hang frame that holds the drain seat in a horizontal state. A third invention is a horizontal drain material laying work boat, in which a hull having an opening of a certain width and a dolly on which a drain material-equipped drain seat can be stretched are movably mounted on the hull. A crane disposed around the opening, and a hanging frame that is vertically moved by the crane and that includes a gripping unit that grips the drain seat with weight material and that holds the drain seat with weight material in a horizontal state. Be prepared.

(Operation) The drain seat with each weight member is sunk when the work boat is stopped, and is accurately installed on the bottom of the water without being affected by the shaking of the work boat. If you use a hanging frame, the drain seat with weight material will always remain horizontal and the accuracy will be further improved. The weight of the horizontal drain material laid on the bottom of the water acts evenly, there is no load deviation, and there is no uneven settlement.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for laying a horizontal drain material and a work boat for laying the same according to the present invention will be described with reference to the drawings. (First Embodiment) FIGS. 1 to 7 show a horizontal drain material laying work ship according to one embodiment (first embodiment) of the present invention. That is, FIGS. 1 and 2 show the overall construction of the laying work ship, and FIGS. 3 to 7 show the partial construction thereof. 8 to 15 show the structure of the horizontal drain member used for implementing the present invention. In the following description, the laying advancing direction of the horizontal drain material, that is, the advancing direction of the laying work boat is defined as “front” and the opposite side is defined as “rear”.

As shown in FIGS. 1 and 2, S is a work boat for laying horizontal drain material (hereinafter simply referred to as "work boat").
A hull portion 1 having a flat deck 1a and an opening 2 having a predetermined width formed at the rear portion thereof, and the deck 1 of the hull portion 1.
a traveling rail 3 laid on the a through the opening 2; and a carriage 5 that is moved back and forth on the traveling rail 3 via wheels 4.
A horizontal drain material supply device 7 which is arranged in the front part of the hull portion 1 and supplies the horizontal drain material 6 spread on the carriage 5.
A drive device 8 for driving the carriage 5, and the opening 2
And a hoisting device 10 arranged around it. Furthermore, the mooring apparatus 12 arrange | positioned at the four corners of the hull part 1 is included. In addition, D is a drain seat with weight material made of horizontal drain material, which is manufactured on the carriage 5 and is used for the lifting device 10
Is to be laid on the bottom of the water.

The detailed structure of each part of the work boat S will be described below. Hull part 1 (see FIGS. 1 and 2) The hull part 1 is made of a steel rectangular box and has buoyancy.
The deck 1a has a flat surface. At the rear of the hull section 1,
A rectangular opening 2 having a constant width is formed through the hull portion 1 in the vertical direction. It is essential that the hull portion 1 be formed with the opening 2, and the hull portion 1 may have any shape such as a square shape.

Traveling Rail 3 (see FIG. 1) The traveling rail 3 is laid in the longitudinal direction on the deck 1a of the hull portion 1 with the opening 2 interposed therebetween. Stoppers 15 (a front stopper 15a and a rear stopper 15b) are arranged at a start point portion on the front side of the traveling rail 3 and an end point portion on the rear side. It should be noted that the traveling rail 3 may be replaced with a groove, and the traveling rail 3 may be omitted.

Bogie 5 (see FIGS. 1 to 5) The bogie 5 has a rectangular box shape having a flat upper surface, and wheels 4 are attached to both sides thereof via axles 17. As a result, the carriage 5 becomes movable on the traveling rail 3 between the start point and the end point side stoppers 15.

Horizontal Drain Material Supplying Device 7 (See FIGS. 1 and 2) The horizontal drain material supplying device 7 supplies a stretchable strip-shaped horizontal drain material 6 onto the carriage 5. A well-known horizontal drain material is used as the horizontal drain material 6. That is, a drain material surrounding the core material with a filter is arranged, and the water sucked through the filter material flows through the core material and is discharged to the outside. The horizontal drain member 6 is rolled into a roll body 6A around the shaft portion 20 in a roll shape in a factory. The horizontal drain material supplying device 7 includes ribs 22 that are installed on the deck 1a so as to face each other.
A bearing 23 is mounted on the shaft 23 of the roll body 6A, and the roll body 6A is rotatably held.

Drive unit 8 (see FIGS. 1 and 2) The drive unit 8 drives the carriage 5 arranged on the traveling rail 3, and is arranged at four positions in the front and rear portions of the deck 1a. It comprises a winch 25 and a tension member 26 that is wound and unwound by the winch 25, and the other end of the tension member 26 is fixed to the carriage 5. Front winch 25a
And the rear winch 25b are driven in synchronization. In addition,
The tension member 26 is usually a wire rope made of steel, but may be made of hemp, or other appropriate material such as a chain.

Lifting / lowering device 10 (see FIGS. 1 to 7) The lifting / lowering device 10 is arranged around the opening 2 and suspends the drain seat D with a weight material so that the drain seat D is attached to the bottom of the water. The device 28, a suspension frame 29 suspended from the portal crane device 28, and a gripping device 30 mounted on the suspension frame 29 (gate crane device 28) (FIGS. 3 to 5). The reference crane device 28 includes a crane body 32, a wire 35 arranged around the crane body 32 via a sheave 33, and wound / unwound by a winch 34,
Consists of The tip of the wire 35 is fixed to the suspension frame 29. The crane body 32 has rigidity, and the tip of the upper arm portion faces the opening 2. Further, the arms of the crane body 32 facing each other can be connected. It should be noted that, in this embodiment, the portal crane device 28 has two front and rear
There may be three or more pairs depending on the size of the weight-equipped drain sheet D arranged in pairs but suspended.

(Hanging Frame 29) (See FIGS. 3 to 5) The hanging frame 29 is hung on the wire 35 of the portal crane device 28. The outer shape of the suspension frame 29 corresponds to the outer shape of the target drain sheet D with weight material.

(Gripping Device 30) (See FIGS. 6 and 7) The gripping device 30 includes a gripping device 30A for gripping the weight of the drain sheet D with weight material and a gripping device for gripping the sheet of the drain sheet D with weight material. 30B,
It consists of two types. The weight gripping device 30A includes a pin 37 connected to the suspension frame 29 and attached thereto, a claw body 38 opened and closed around the pin 37, and a cylinder portion 39 interposed in the claw body 38. Cylinder part 3
When the piston rod 39a of No. 9 extends, the pawl 38 opens and closes and holds the ballast 50 of the drain seat D with weight. The sheet gripping device 30B has a cylindrical case 4 that penetrates through the suspension frame 29 and is mounted.
1 and the upper guide portion 42 housed in the case 41.
It is composed of a connecting rod 42 composed of a, an intermediate rod portion 42b, and a ring portion 42c at the lower end, and two cylinder portions 43 sandwiching the rod portion 42b of the connecting rod 42 from both sides. The string of the drain sheet with weight material D is engaged with the ring portion 42c of the connecting rod 42. The connecting rod 42 is gripped and opened by expanding and contracting the piston rod 43a of the cylinder portion 43.

Mooring device 12 (see FIGS. 1 and 2) The mooring device 12 comprises a mooring line 45 and a mooring winch 46 for winding the mooring line 45, and is installed at four corners of the deck 1a. An anchor (not shown) moored to the bottom 10 is arranged at the tip of the mooring line 45. The mooring device 12 is divided into a front part 12a and a rear part 12b.

Drain sheet D with weight material (Fig. 1,
(See FIGS. 2 and 8 to 15) The drain sheet D with weight material is first shown in FIGS.
As shown in FIG. 5, the weight member 50 and the cord 51 are added to the sheet 6 made of the horizontal drain material, and the weight member 50 is characterized in that the weight portion Da and the overlap margin Db are provided. It is divided into. That is, the portion where the weight material 50 is arranged constitutes the weight portion Da, and the remaining portion constitutes the overlap margin Db. More specifically, the weight material 50 is formed by connecting a serpentine cage formed by accommodating a granular heavy substance 54 of coarse aggregate of gravel / crushed stone to a metal mesh or a synthetic resin mesh 53, and the serpentine cage is connected by a pressing material 55. It is fixed to the seat 6. The mesh of the mesh 53 has a size such that the coarse aggregate 54 does not deviate. The granular weight value 54 also has a drainage function. The weight member 50 has a rectangular shape and is arranged so as to be biased to two adjacent sides of the sheet 6, and the portion is referred to as a weight portion Da. In addition, the weight material 50
The position of corresponds to the shape of the suspension frame 29, and comes directly below the gripping device 30A at a fixed position. A string 51 is fixed to the overlap margin Db at a predetermined position. That is, the hanging frame 29
It is immediately below the gripping device 30B at a fixed position of.

The weight material 50 is not limited to the above-mentioned snake-cage mode, but may take a so-called sandbag mode. In this case, the mesh body 53 has a small mesh, and the granular heavy substance 54 of fine aggregate such as earth and sand is enclosed inside. In this aspect, the weight material 50 is connected to the drain sheet material 6 and has a drainage function in addition to the loading function.

FIG. 11 shows another embodiment of the drain sheet with weight material. Drain sheet D with this weight material
1 has a weight portion Da formed by leaving the overlap margin Db on the upper side and the right side.

12 to 15 show another embodiment of the drain seat with weight material. In the drain sheet with weight material D2 of this aspect, as shown in FIG. 12, a weight portion Da made of the weight material 50 is formed in the central portion of the sheet 6, and each side edge holds a constant distance from the weight portion Da. Then, the weight material 57 for engagement is arranged, and the overlap margin D
b is formed. FIG. 13 and FIG. 14 show the connection procedure of the drain sheet D2 with weight material, in which the drain sheet D2 (I) with weight material installed earlier is connected to another drain sheet D2 (II) with weight material that follows. The engaging weight members 57 of the overlapping margin Db are engaged and connected. FIG. 15 shows still another embodiment of the drain sheet with weight member. According to this drain material-equipped drain sheet D3, the engaging weight materials 57 are adjacent to each other.
It is installed on the upper surface at one side and on the lower surface at the other two sides.

With the work boat S and the drain seat with weight material D of this embodiment constructed as described above, the horizontal drain material is laid as follows. The steps will be described below.

(1) The work boat S is towed to a predetermined water area in the soft ground improvement target area in which vertical drain piles have been placed in advance. When the work boat S is of the self-propelled type, it goes without saying that it is moved by self-propelled.

(2) When the work boat S reaches the predetermined water area, the work boat S is moored by the mooring rope 45 of the mooring device 12.
At this time, the mooring rope 45 at the rear part is connected to the rear winch 46 as much as possible.
It is wound around b and shortens to the anchor, and the mooring line 45 at the front part is pulled out from the front winch 46a as much as possible,
Keep a long distance to the anchor.

(3) Next, the drive device 8 is operated to drive the carriage 5
Is moved forward, and the horizontal drain material 6 is unwound from the horizontal drain material supply device 7 onto the carriage 5 to a certain length and stretched. (3A) In this state, drain seat D with weight material
To produce.

(4) Then, the drive device 8 is operated to move the carriage 5 rearward to position it on the opening 2 and stop it at a position corresponding to the lifting device 10 (fixed position). (4A) In this state, the winch 34 of the portal crane section 28 of the hoisting and lowering device 10 is operated to suspend the hoisting frame 29.
And the gripping device 30 mounted on the hanging frame 29 grips the drain sheet D with weight material. That is, in the gripping device 30A, the cylinder portion 3
The weight 50 is gripped by the operation of 9. Further, in the gripping device 30B, the string 5 of the drain sheet D with the weight material is attached.
1 is engaged with the ring portion 42c of the connecting rod 42.

(5) Next, the suspension frame 29 is raised slightly and the carriage 5 is moved to the front. Then, the suspension frame 29 is lowered. As a result, the drain sheet with weight material D falls into the water through the opening 2.

(6) Next, the winch 46 of the mooring device 12 is driven to advance the work boat S. That is, by winding the winch 46a at the front part and rewinding the winch 46b at the rear part, the work boat S advances with a predetermined track without shaking.

(7) During this time, the
According to the process of (3A), a drain sheet D with a weight material is manufactured.

(8) The above steps (4) and (7) are repeated,
A row of horizontal drains will be laid on the bottom of the water.

(9) The work boat S is returned to its original position, and the anchors of the mooring lines 45 at the front and rear parts are laterally displaced and driven into the water bottom. This causes the work boat S to move laterally.

(10) After that, the steps (8) to (9) are repeated to lay a horizontal drain material so as to cover the improved ground area having a predetermined area. After that, when the horizontal drain material is laid all over the area, the embankment is set up on the horizontal drain material up to the surface of the water.

As described above, according to this embodiment, since the drain seat D with weight material is dropped into the water through the suspension frame 29 in the stopped state, the work boat S
Is unaffected by the sway of and descends accurately, so
The drain sheet D with weight material during the dropping operation is prevented from being twisted or broken, and the bottom of the drain sheet D is reliably attached to the water bottom, and the horizontal drain material is accurately laid on the water bottom.
In addition, in the lifting operation and the progress of the work boat,
The drain sheet D with weight material is manufactured on the work boat, and the horizontal horizontal drain material is efficiently laid.

(Second Embodiment) FIGS. 17 and 18 show a horizontal drain material laying work ship according to another embodiment (second embodiment) of the present invention. In the figure, the same reference numerals are given to the same members as those in the first embodiment. In the present embodiment, the opening 2A of the hull portion 1 is formed over almost the entire range of the hull portion 1. Similar to the first embodiment, the carriage 5 is moved back and forth over the entire length of the opening 2 with the drive device 8 along the rails 3 arranged on both sides of the opening 2A. The horizontal drain material supply device 7 is arranged at two positions at the front and rear ends of the opening 2A. A particularly characteristic feature of the present embodiment is that the hoisting device 10A employs a so-called moving gate crane and is arranged across the truck 5 along a rail 60 arranged further outside the truck rail 3. In addition, the front-back movement is performed in the same reciprocal stroke as the carriage 5. The hanging device 10A is free to be driven by a driving device built into its base portion in a self-propelled manner or by a winch (not shown). The hanging device 29 includes a hanging frame 29.
Is arranged so as to be vertically movable via the wire 35, as in the first embodiment.

The work vessel S1 carries out the work for laying the horizontal drain material as follows. In FIGS. 17 and 18, the carriage 5 is arranged in the front part A and the lifting device 10A is arranged in the rear part B in the traveling direction (direction a). Then, in the carriage 5, the drain seat D with a weight material is manufactured. In the hoisting and lowering device 10A, the drain sheet D with a weight material is hoisted by the hoisting frame 29, and the work is dropped and laid horizontally. When the laying work at the rear portion B is completed, the suspension frame 29 is pulled up, and then the lifting device 10A is moved to the front portion A, where the drain seat D with weight material on the carriage 5 is gripped. Then, the trolley | bogie 5 is moved to the rear part B, and the drain seat D with a weight material is manufactured here. During this period, the draining device D with weight material is dropped and laid by the lifting device 10A at the front portion A. When the laying work is completed, the work boat S1 advances by two sections.

In this way, if the work boat S1 is used,
Laying work for two sections can be performed while the work boat S1 is stationary, and efficient construction can be performed.

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included in the technical scope of the present invention. The opening 2 is not limited to a rectangle. The point is to allow the sinking of the drain sheet D with weight material. The trolley 5 may be driven by either self-propelled driving or other driving. The rail 3 can also be omitted as appropriate. In the hoisting and lowering device 10, the crane device is not limited to the gate-shaped crane 28 as long as it has the hoisting and hoisting function of the hoisting frame 29, and other cranes can be adopted.

[0038]

According to the present invention, since the drain seat with weight material is dropped into the water through the suspension frame when the ship is stopped, it is not affected by the sway of the work ship and accurately descends. Therefore, the drain sheet with weight material is prevented from being twisted or broken during the dropping operation, the bottom of the drain sheet is surely attached to the bottom, and the horizontal drain material is accurately laid on the bottom of the water. In addition, in the lifting operation and the progress state of the work boat, the drain sheet with weight material is manufactured on the work vessel, and the horizontal drain material is efficiently laid. The weight material acts evenly on the horizontal drain material laid on the bottom of the water, there is no load bias, and there is no uneven settlement after laying.

[Brief description of drawings]

FIG. 1 is a plan view showing an entire laying work ship for carrying out the method for laying a horizontal drain material according to the present invention.

FIG. 2 is a side view of FIG. 1 (a view taken along the line II in FIG. 1).

FIG. 3 is a partial cross-sectional side view of the rear part of the work boat (III-II in FIG. 4)
(I line sectional view).

FIG. 4 is a plan view of FIG. 3;

5 is a sectional view taken along line VV of FIGS. 3 and 4. FIG.

FIG. 6 is an exemplary view of a weight gripping device.

FIG. 7 is an exemplary view of a sheet gripping device.

FIG. 8 is a plan configuration diagram of a drain sheet with a weight material.

FIG. 9 is a detailed configuration diagram of weights.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is a plan configuration diagram of another aspect of the drain sheet with weight material.

FIG. 12 is a plan configuration view showing still another aspect of the drain sheet with a weight member.

FIG. 13 is a side view configuration diagram of FIG. 12;

FIG. 14 is a diagram showing a connection state between the drain material-equipped drain seats shown in FIGS. 12 and 13;

FIG. 15 is a diagram showing a connected state of the drain seat with weight material in still another mode.

FIG. 16 is a diagram for laying and constructing a horizontal drain material.

FIG. 17 is a plan view showing the whole of another laying work ship that carries out the method for laying a horizontal drain material of the present invention.

FIG. 18 is a side view of FIG.

[Explanation of symbols]

S, S1 ... Horizontal drain material laying work vessel, D ... Drain sheet with weight material, Da ... Weight part, Db ... Stacking margin, 1 ... Hull, 2, 2A ... Opening, 5 ... Bogie, 6 ... Horizontal drain material, 10 , 10A ... Lifting device, 28 ... Crane, 29 ... Hanging frame, 30 ... Gripping device, 50 ...
Weight material

Front page continuation (72) Inventor Eijiro Muramatsu 1-16-14 Shibuya, Shibuya-ku, Tokyo Tokyu Construction Co., Ltd. (72) Inventor Yukio Oami 1-16-14 Shibuya, Shibuya-ku, Tokyo Construction Tokyu Co., Ltd. (72) Inventor Motohiro Ueyama 13-1 Akashimachi, Chuo-ku, Tokyo Furukawa Gumi Co., Ltd.

Claims (5)

[Claims] 1. A drain with a weight material, in which a weight material is placed and fixed on a rectangular flat sheet made of a horizontal drain material with a margin for stacking on a work boat having an opening of a certain width formed in a hull. A seat is manufactured, the drain seat with weight material is sunk to the bottom of the water through the opening of the work boat, and a plurality of drain seats with weight material are provided through the overlapping margin of the drain seat with weight material as the work boat progresses. The method for laying a horizontal drain material is characterized in that 2. The method for laying a horizontal drain material according to claim 1, wherein the weight material has a tubular shape, and the net body contains coarse aggregate such as gravel and crushed stone. 3. The method for laying a horizontal drain material according to claim 1, wherein the weight material has a tubular shape, and the net body accommodates fine aggregate such as sand. 4. A drain with a weight material, in which a weight material is placed and fixed on a rectangular flat sheet made of a horizontal drain material while ensuring a stacking margin, on a work boat having an opening of a certain width formed in a hull. A seat is manufactured, and the drain seat with weight material is hung and held by a suspension frame that holds the weight material in a horizontal state, and the drain seat with weight material is sunk to the bottom of the water through the opening of the work boat, A method for laying a horizontal drain material, comprising laying a plurality of drain material-equipped drain sheets through an overlap margin of the weight material-equipped drain sheet with progress. 5. A hull having an opening of a fixed width, a carriage on which the drain seat with weight material can be stretched, which is movable on the opening, a crane arranged around the opening, A work vessel for laying a horizontal drain material, comprising: a lifting unit that is vertically moved by a crane and that holds the drain seat with weight material, and a suspension frame that holds the drain seat with weight material in a horizontal state.