JP3057151B2 - Horizontal drain material laying method and laying work boat - Google Patents

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 horizontal drain material having a flat plate shape on the bottom of a water surface, and a work boat for laying the same.

[0002]

2. Description of the Related Art It is known that a vertical drain material such as a sand pile is poured vertically into a soft soil layer at a predetermined interval and a horizontal drain material is laid on a surface layer in order to improve a soft ground at a water bottom. In recent years, attempts have been made to use a plate-shaped drain material comprising a public drain as a core material and a filter material surrounding the public drain as the horizontal drain material. The public drain and the filter material are both preferably made of synthetic resin. In order to lay the horizontal drain material on the water floor, a laying work boat is used, but in the conventional laying work, the horizontal drain material wound up in a roll shape on the laying work boat is simply fed out, and the water floor is laid out. Then, a means for placing gravel, sand, etc. on the horizontal drain material is adopted. Alternatively, a means for extending and laying out a horizontal drain material to which a fixing member serving as a weight is attached in advance is also employed. However, in either of the former and latter methods, the horizontal drain material is subjected to various disturbance factors until it reaches the bottom with the progress of the work boat, and is difficult to be laid as desired, and the reliability of the construction is poor. ,
In addition, a situation in which the horizontal drain material breaks may result. Therefore, in the former means, therefore, it is necessary to increase the strength of the horizontal drain material more than necessary, and in the latter means, the driving of the feeding device for the wound horizontal drain material is required. It is necessary to increase the force, and there are problems such as an increase in equipment costs.

[0003] Accordingly, the present applicants have previously filed Japanese Patent Application No.
No. 334244 (the prior invention) proposed a method of laying a horizontal drain material on a water floor as desired and efficiently, without being affected by shaking due to the progress of the work boat, and a work boat for laying the horizontal drain material. .

[0004]

SUMMARY OF THE INVENTION The present invention is a further development of the prior invention, which allows the horizontal drain material to be more accurately laid on the water bottom without being affected by shaking accompanying the progress of the work boat. Another object of the present invention is to provide a method of laying horizontal drain materials without uneven settlement of the horizontal drain materials after the laying, and a work boat for laying the horizontal drain materials.

[0005]

The present invention specifically has the following configuration. That is, the first invention is a horizontal drain
A method of laying timber, where a rectangular
On a work boat having an opening formed thereon, transfer to the opening
On a movable trolley, a rectangular plane made of horizontal drain material
Place the weight material on the sheet and secure
To manufacture a drain sheet with weight material,
In the stopped state, the drain sheet with the weight material is
Submerged in the water bottom through the opening of the work boat,
Stack the drain sheet with the weight material as it progresses
Laying drain sheets with multiple weight materials through
To be characterized. In the above configuration, an aspect is adopted in which the weight material has a cylindrical shape, and the mesh body contains coarse aggregate such as gravel and crushed stone, or the mesh body contains fine aggregate such as sand. The second invention is also a horizontal drain
This is a method of laying down the hull, where an opening with a certain width is formed in the hull.
Of a horizontal drain material
Weight material is placed on a flat sheet with sufficient overlap
And fix it to make a drain sheet with weight material.
Suspension that keeps the drain sheet with weight material horizontal
Suspended on the hanging frame,
A submersible seat is laid down on the water floor through the opening of the workboat,
As the work ship progresses, the drainage with the weight material
Drainage with multiple weights through the stacking allowance
Laying down a seat. A third invention is a work boat for laying horizontal drain material, wherein a hull having an opening having a constant width is formed, and the hull is movable on the opening.
A truck on which a drain sheet with a weight material can be extended, a crane arranged around the opening, and a gripper vertically moved by the crane to grip the drain sheet with a weight material, and a drain sheet with a weight material And a suspension frame for holding the frame horizontally.

(Operation) Each drain sheet with weight material is laid down when the work boat is stopped, and is accurately placed on the water bottom without being affected by the motion of the work boat. If a suspension frame is used, the drain seat with the weight material is always kept horizontal, and the accuracy is further improved. The weight of the horizontal drain material laid on the water floor acts evenly, there is no deviation of the load, and there is no uneven settlement.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for laying a horizontal drain material and a laying work boat according to the present invention will be described with reference to the drawings. (First Embodiment) Figs. 1 to 7 show a work boat for laying horizontal drain materials according to one embodiment (a first embodiment). 1 and 2
3 shows the overall configuration of the laying work boat, and FIGS. 3 to 7 show its partial configuration. 8 to 15 show the configuration of a horizontal drain material used in the embodiment of the present invention. In the following description, the direction in which the horizontal drain material is laid, ie, the forward direction of the laying work boat, is defined as “forward”, and the opposite side is defined as “rear”.

As shown in FIGS. 1 and 2, S is a work boat for laying horizontal drain materials (hereinafter simply referred to as a "work boat").
A hull portion 1 having a flat deck 1a and an opening 2 having a predetermined width formed in a rear portion thereof, and a deck 1 of the hull portion 1;
a traveling rail 3 laid across the opening 2 in a, a truck 5 moved back and forth on the traveling rail 3 via wheels 4,
A horizontal drain material supply device 7 arranged at the front of the hull 1 and supplying a horizontal drain material 6 spread on the carriage 5
A driving device 8 for driving the cart 5 and the opening 2
And a hoisting device 10 disposed around. Further, it includes mooring devices 12 arranged at the four corners of the hull 1. D is a drain sheet with a weight material made of a horizontal drain material, which is manufactured on a trolley 5 and has a hanging device 10.
It is 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 square box and has buoyancy.
The deck 1a has a flat surface. At the rear of the hull 1
An opening 2 having a rectangular shape with a constant width is formed penetrating the hull 1 vertically. The hull 1 must have the opening 2 formed therein, and the hull 1 may have any shape such as a square shape.

The traveling rail 3 (see FIG. 1) is laid on the deck 1a of the hull 1 in the longitudinal direction with the opening 2 interposed therebetween. A stopper 15 (a front stopper 15a, a rear stopper 15b) is disposed at a start point on the front side and an end point on the rear side of the traveling rail 3. It should be noted that the running rail 3 can be replaced with a concave groove, and the running rail 3 can be omitted.

Dolly 5 (See FIGS. 1 to 5) The dolly 5 has a rectangular box shape with a flat upper surface, and wheels 4 are mounted on both sides via axles 17. As a result, the carriage 5 can move freely between the stoppers 15 on the starting point and the end point side on the traveling rail 3.

Horizontal Drain Material Supply Device 7 (See FIGS. 1 and 2) The horizontal drain material supply device 7 supplies a rollable and expandable belt-shaped horizontal drain material 6 onto a carriage 5. As the horizontal drain material 6, a known horizontal drain material is used. That is, a drain material surrounding the core material with the filter is provided, and water sucked in through the filter material flows through the core material and is discharged to the outside. The horizontal drain material 6 is wound into a roll around a shaft 20 in a factory to form a roll 6A. The horizontal drain material supply device 7 is provided with ribs 22 installed opposite to the deck 1a.
The shaft 23 of the roll body 6A is received by the bearing 23, and the roll body 6A is rotatably held.

Driving device 8 (see FIGS. 1 and 2) The driving device 8 is for driving the bogie 5 disposed on the traveling rail 3 and is disposed at four positions in the front and rear portions of the deck 1a. It comprises a winch 25 and a tension member 26 wound and unwound by the winch 25, and the other end of the tension member 26 is fixed to the carriage 5 respectively. Front winch 25a
And the rear winch 25b are driven synchronously. In addition,
As the tension member 26, a wire rope made of steel is usually used, but it may be made of hemp, and an appropriate material such as a chain is used.

Hanging device 10 (see FIGS. 1 to 7) The hanging device 10 is arranged around the opening 2 and suspends the drain sheet D with a weight material to land on the bottom of the water. a device 28, a lower frame 29 suspended to be hung on該門crane device 28, the gripping device 30 to be attached to the hanging down frame 29, Tona
That, (portal crane apparatus 28) (see FIGS. 3 to 5) portal crane device 28 includes a crane precursor 32, is disposed through the crane precursor 32 around the sheave 33, the winding-up by the winch 34 A wire 35 to be returned,
Consists of The tip of the wire 35 is fixed to the suspension frame 29. The crane frame 32 has rigidity, and the tip of the upper arm faces the opening 2. Further, it is possible to adopt a mode in which the arms of the crane body 32 facing each other are connected. In this embodiment, the portal crane devices 28 are arranged in two pairs in front and rear, but may be three or more pairs in accordance with the size of the suspended drain sheet D with a weight material.

(Suspension Frame 29) (See FIGS. 3 to 5) The suspension 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 drain sheet D with the weight material to be processed.

(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 the weight material, and a gripping device for gripping the drain sheet D with the weight material. 30B,
Consisting of two types. The weight gripping device 30A includes a pin 37 connected to and attached to the suspension frame 29, a claw body 38 opened and closed around the pin 37, and a cylinder portion 39 interposed on the claw body 38. Cylinder part 3
The claw body 38 opens and closes by the extension operation of the piston rod 39a of No. 9 and grips the ballast 50 of the drain sheet D with the weight material. The sheet holding device 30 </ b> B is a cylindrical case 4 that is mounted through the suspension frame 29.
1 and an upper guide portion 42 housed in the case 41.
a, a connecting rod 42 composed of an intermediate rod 42b and a ring 42c at the lower end, and two cylinders 43 which sandwich the rod 42b of the connecting rod 42 from both sides. The string of the drain sheet D with a weight material is engaged with the ring portion 42c of the connecting rod 42. The connecting rod 42 is gripped / released by the expansion / contraction operation of the piston rod 43a of the cylinder part 43.

Mooring device 12 (see FIGS. 1 and 2) The mooring device 12 includes 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) for mooring to the water bottom 10 is provided at a 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 FIG. 2, FIGS. 8 to 15) The drain sheet D with the weight material is first shown in FIGS.
As shown in FIG. 2, a weight member 50 and a string 51 are added to a sheet 6 made of a horizontal drain material, and the arrangement of the weight member 50 is characterized by the weight portion Da and the overlap allowance Db. It is divided into That is, the portion on which the weight member 50 is disposed constitutes the weight portion Da, and the remaining portion constitutes the overlap margin Db. More specifically, the weight member 50 is formed by connecting a snake cage in which a granular weight material 54 of coarse aggregate of gravel and crushed stone is accommodated in a wire net or a synthetic resin net 53, and the snake cage is held by a holding member 55. It is fixed to the seat 6. The mesh of the net 53 has such a size that the coarse aggregate 54 does not deviate. The particulate weight value 54 also has a drainage function. The weight member 50 has a rectangular shape as a whole and is arranged so as to be biased to two adjacent sides of the sheet 6, and this portion is referred to as a weight portion Da. In addition, weight material 50
Corresponds to the shape of the suspension frame 29, and comes directly below the gripping device 30A at a fixed position. The string 51 is fixed to a predetermined position in the overlap margin Db. That is, the hanging frame 29
Is located immediately below the gripping device 30B.

The weight member 50 is not limited to the above-described snake cage form, but may take a so-called sandbag form. In this case, the mesh 53 has a small mesh, and a granular heavy substance 54 of fine aggregate such as earth and sand is enclosed therein. In this embodiment, the weight member 50 communicates with the drain sheet member 6 in addition to the loading function, and has a drainage function.

FIG. 11 shows another embodiment of a drain sheet with a weight material. This drain sheet D with weight material
No. 1 is formed by leaving the overlap portion Db on the upper side and the right side of the weight portion Da.

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

With the work boat S and the drain sheet D with the weight material of the present embodiment configured as described above, the laying of the horizontal drain material is performed as follows. Hereinafter, description will be made in the order of steps.

(1) The work boat S is towed to a predetermined water area of a soft ground improvement target area in which a vertical drain pile has been previously installed. When the work boat S is self-propelled, it is needless to say that the work boat S is moved by self-propulsion.

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

(3) Next, the driving device 8 is operated to operate the truck 5
Is moved forward, the horizontal drain material 6 is unwound from the horizontal drain material supply device 7 onto the carriage 5 to a certain length, and is extended. (3A) In this state, a drain sheet D with a weight material is manufactured.

(4) Thereafter, the drive unit 8 is operated to move the carriage 5 rearward, and is positioned above the opening 2 and stopped at a position (fixed position) corresponding to the suspension unit 10. (4A) In this state, the winch 34 of the portal crane 28 of the hoisting and lowering device 10 is operated to lower the hanging frame 29, and the gripping device 30 attached to the hanging frame 29.
To hold the drain sheet D with the weight material. That is, in the gripping device 30A, the weight 50 is gripped by the operation of the cylinder portion 39. In addition, the gripping device 30
In B, the string 51 of the drain sheet D with the weight material is engaged with the ring portion 42c of the connecting rod 42.

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

(6) Next, the winch 46 of the mooring device 12 is driven to move the work boat S. That is, by winding up the front winch 46a and rewinding the rear winch 46b, the work boat S moves with a predetermined wake without being shaken.

(7) During this time, on the truck that has moved forward,
A drain sheet D with a weight material is manufactured according to the process of (3A).

(8) The steps (4) and (7) are repeated,
Laying a row of horizontal drains to 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 portions are shifted laterally and driven into the water bottom. The work boat S is thereby moved in the lateral direction.

(10) Thereafter, the above steps (8) to (9) are repeated, and a horizontal drain material is laid so as to cover the improved ground area having a predetermined area. Thereafter, when the horizontal drain material is laid in the entire area, the embankment is laid on the horizontal drain material until reaching the surface of the water.

As described above, according to the present embodiment, the drain seat D with the weight material is dropped into the water via the suspension frame 29 in the stopped state, so that the work boat S
Is not affected by the sway of
During the dropping operation, the drain sheet D with the weight material is prevented from being twisted or broken, the landing on the water bottom is ensured, and the accurate horizontal drain material is laid on the water bottom.
In addition, in the hanging operation and the progress of the work boat,
The work of manufacturing the drain sheet D with the weight material on the work boat is performed, and the efficient work of laying the horizontal drain material is performed.

(Second Embodiment) FIGS. 17 and 18 show a work boat for laying horizontal drain materials according to another embodiment (a second embodiment) of the present invention. In the figure, the same reference numerals are given to members equivalent to those in the first embodiment. In the present embodiment, the opening 2A of the hull 1 is formed over substantially the entire range of the hull 1. The carriage 5 is moved back and forth over the entire length of the opening 2 by the driving device 8 along the rails 3 arranged on both sides of the opening 2A, as in the first embodiment. The horizontal drain material supply device 7 is disposed at two positions at the front and rear ends of the opening 2A. What is particularly characteristic in the present embodiment is that
The lifting and lowering device 10A employs a so-called movable gate crane, and has a rail 60 disposed further outside the bogie rail 3.
Is arranged across the trolley 5 along with the trolley 5
This is to move back and forth in the same reciprocating stroke. The suspension device 10A can be freely driven by a drive device built in its base or driven by a winch (not shown). Hanging device 10A
The suspension frame 29 is vertically movable via the wire 35 in the same manner as in the first embodiment.

The horizontal drain material is laid by the work boat S1 as follows. 17 and 18, in the traveling direction (direction A), a truck 5 is disposed at a front portion A, and a suspension device 10A is disposed at a rear portion B. Then, on the trolley 5, a drain sheet D with a weight material is manufactured. In the suspension apparatus 10A, the drain sheet D with a weight material is suspended by the suspension 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 suspension device 10A is moved to the front portion A, where the drain sheet D with a weight material on the carriage 5 is gripped. Thereafter, the carriage 5 is moved to the rear portion B, where a drain sheet D with a weight material is manufactured. In the meantime, the work of dropping and laying the drain sheet D with the weight material is performed by the suspension device 10A at the front part A. When the laying operation is completed, the work boat S1 moves forward by two sections.

As described above, if the work boat S1 is used,
Laying work for two sections can be performed in a stationary state of the work boat S1, 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 concept of the present invention. That is, the following embodiments are included in the technical scope of the present invention. The opening 2 is not limited to a rectangle. In short, it is only necessary to allow the sinking of the drain sheet D with the weight material. The carriage 5 may be driven independently or independently. Also, the rail 3 can be omitted as appropriate. In the hoisting and lowering device 10, the crane device is not limited to the portal crane 28 as long as the crane device has a function of lifting and lowering the hanging frame 29, and other types of crane devices can be adopted.

[0038]

According to the present invention, the drain seat with the weight material is dropped into the water through the suspension frame in the stopped state, so that it is not affected by the motion of the work boat and descends accurately. Therefore, the drain sheet with the weight material during the dropping operation is not twisted or broken, and the bottom of the drain sheet with the weight material is reliably settled on the water bottom, so that the accurate horizontal drain material is laid on the water bottom. In addition, in the state of the hanging operation and the progress of the work boat, the work of manufacturing the drain sheet with the weight material is performed on the work boat, and the efficient work of laying the horizontal drain material is performed. The weight material acts evenly on the horizontal drain material laid on the water floor, there is no deviation of the load, and there is no uneven settlement after the laying.

[Brief description of the drawings]

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

FIG. 2 is a side view of FIG. 1 (a view taken in the direction of arrow 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 sectional view).

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

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

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

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

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

FIG. 9 is a detailed configuration diagram of a weight.

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

FIG. 11 is a plan view of another embodiment of a drain sheet with a weight member.

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

FIG. 13 is a side view of FIG.

FIG. 14 is a diagram showing a state of connection between the drain sheets with a weight material shown in FIGS. 12 and 13;

FIG. 15 is a diagram showing a connection state of still another mode of the drain sheet with the weight member.

FIG. 16 is a diagram showing the installation procedure of a horizontal drain material.

FIG. 17 is a plan view showing the whole of another laying work boat for implementing the method of laying horizontal drain materials of the present invention.

FIG. 18 is a side view of FIG. 17;

[Explanation of symbols]

S, S1: Horizontal drain material laying work boat, D: Drain seat with weight material, Da: Weight portion, Db: Overlap allowance, 1: Hull, 2, 2A ... Opening, 5: Bogie, 6: Horizontal drain material, 10 , 10A ... hanging-off device, 28 ... crane, 29 ... hanging frame, 30 ... gripping device, 50 ...
Weight material

Continued on the front page (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 Tokyu Construction Co., Ltd. (72) Inventor Motohiro Ueyama 13-1 Akashicho, Chuo-ku, Tokyo Furukawa Gumi Co., Ltd. (56) References JP-A-9-195248 (JP, A) JP-A-5-171163 (JP, A) JP-A-3-13617 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 3/10 B63B 35/00

Claims (5)

(57) [Claims] 1. A worktable having a rectangular opening formed in a hull and having a fixed width, the table being movable on the opening.
On car, to manufacture a drain sheet with weight material was placed and fixed a weight material to ensure the margin superimposed on a rectangular planar sheet consisting of horizontal drain material, the weight member with the drain in the stopped state of the work ship Laying a seat on the water floor through an opening of the work boat, and laying a plurality of drain sheets with weight material through a margin for overlapping the drain sheet with weight material as the work boat progresses. How to lay drain material. 2. The method of laying a horizontal drain material according to claim 1, wherein the weight material has a cylindrical shape, and a coarse aggregate such as gravel or crushed stone is accommodated in a net. 3. The method for laying a horizontal drain material according to claim 1, wherein the weight material has a cylindrical shape, and a fine aggregate such as sand is accommodated in the mesh body. 4. A drain with weight material on a work boat having an opening of a constant width formed in a hull, wherein a weight material is placed and fixed on a rectangular flat sheet made of a horizontal drain material while securing an overlap margin. Producing a sheet, suspending and holding the drain sheet with the weight material in a hanging frame that holds the horizontal state, sinking the drain sheet with the weight material through the opening of the work boat to the water floor, A method of laying a horizontal drain material, comprising: laying a plurality of drain sheets with a weight material through a margin for overlapping the drain sheets with a weight material as the process proceeds. 5. A hull in which an opening having a constant width is formed, a trolley which is movable on the opening and on which a drain sheet with a weight material can be spread on an upper surface, a crane arranged around the opening, A work vessel for laying a horizontal drain material, comprising: a hanging frame that is vertically moved by a crane and that holds a drain sheet with a weight material and that holds a drain sheet with a weight material in a horizontal state.