JPS6142054B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screeding method and apparatus for constructing a rubble layer, that is, a crushed stone foundation, on the seabed or the bottom of the water (hereinafter simply referred to as the bottom of the water).

For example, as shown in Figure 1, there is a basic structure D on the bottom of the water.
When constructing a
On the dredged bottom surface B is a rubble layer C ₁ of gravel, crushed stone, etc.
C ₂ and C ₃ are sequentially formed to a predetermined thickness, a structure D' is constructed thereon, and a layer E of rubble is further formed.

In this way, the top surface of the rubble layer must be leveled to make it substantially flat. For this purpose, a step of adding rubble and a step of screeding for leveling are required.

In the past, it was necessary to use a diver to introduce and spread the rubble in this way, which was quite a tedious task.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an underwater screeding method that allows rubble to be automatically introduced and leveled using a ship, and an apparatus for directly carrying out the method.

According to the present invention, a work boat is moored at a predetermined position,
The rubble is sent from the work boat to the dumping hopper via a telescoping and elevating ladder, the dumping hopper is held in a vertical position at a predetermined height, and the rudder is moved by telescoping and elevating to form a rubble layer. After moving a predetermined distance, the work boat is moved by extending/contracting and raising the rudder with the dumping hopper stopped, and after a predetermined length of rubble layer has been formed, the work boat is moved in the width direction and the following steps are taken: An underwater screed method has been proposed which is characterized by repeating the above operations.

Further, according to the present invention, there is provided a work boat that can be moored at a predetermined position with an anchor, a rubble hopper provided on the work boat, a belt conveyor for sending rubble from the rubble hopper, and a belt conveyor extending toward the bottom of the water from the end of the belt conveyor. A ladder that can be raised and retracted, a device for raising and retracting the ladder, a hydraulic cylinder device that extends and retracts the ladder, a drop-off hopper pivotally attached to the tip of the ladder, and a drop-off hopper that pivots with respect to the rudder. An underwater screed device is provided, which is characterized by being equipped with a hydraulic cylinder device.

Therefore, by holding the dumping hopper in a vertical position at a predetermined height from the water bottom and supplying rubble, and moving the dumping hopper by extending and raising the ladder, the rubble layer can be placed at a predetermined height from the water bottom. can be formed. At this time, leveling work is also performed on the lower end of the dumping hopper at the same time, so the work of putting in rubble and leveling work can be performed in one step. Since the distance that the dumping hopper can be moved due to the elevation, expansion and contraction of the rudder is limited, after moving the dumping hopper by a certain length using the rudder, the work boat is moved and then again by the elevation, expansion and contraction of the rudder. Move the rubble stone hoppa. Since the width of the dumping hopper is limited, after the lengthwise leveling of the rubble is completed, the work boat can be moved in the width direction by pulling the mooring wire, and the work can be repeated in the same manner.

When carrying out the present invention, when particularly levelness is required, such as on the upper surface of the uppermost riprap layer, it is preferable to move the dumping hopper guided by a horizontal girder installed horizontally. By doing so, the lower end of the dumping hopper can screed the upper surface of the laid rubble layer, thereby making it possible to obtain a substantially horizontal surface.

In carrying out the present invention, it is preferable to use a pull wire as the device for tilting the rudder.

An apparatus for carrying out the present invention will be described below with reference to FIGS. 2 to 5.

In FIGS. 2 and 3, a work boat 1 is moored at a predetermined position with an anchor 2, and on the deck of the work boat 1 there is an operation and control room 3, a plurality of rubble hoppers 4, and the rubble hoppers. A belt conveyor 5 that sends the rubble from the belt conveyor 5 toward the stern, a rudder 6 that receives the rubble from the end of the belt conveyor 5 and moves it toward the water bottom B, and a support wire for supporting the rudder 6 at a predetermined inclined position. 7a is provided. Another support wire 7b is fixed to the ladder 6, so that the ladder 6 is supported so as to be able to move up and down. Each rubble stone hopper 4
In the illustrated embodiment, a vibrating feeder 10 is provided, and a connecting conveyor 11 is provided for receiving the rubble from each vibrating feeder 10 and sending it to the belt conveyor 5.

The rudder 6 has a first rudder part 6a which is rotatably pivoted at one end near the stern, and which receives rubble sent from the belt conveyor 5, and a second rudder part which is slidably fitted into the first rudder part 6a. The first ladder section 6a and the second ladder section 6b are extendably connected by a hydraulic cylinder device 12. Second ladder part 6
A dumping hopper 13 is pivotally attached to the tip of b, so that even if the inclination angle of the ladder 6 changes, the dumping hopper 13 can be held at the correct vertical position. The wire 7a is wound up by a winch 15, and the wire 7b is wound up by a winch 16. The winch 17 also controls the elevation angle of the derrick 8.

In operation, the rubble from the rubble hopper 4 is conveyed from the vibratory feeder 10 via the conveyor 11 to the belt conveyor 5, and is stored via the ladder 6 in the dumping hopper 13. The lower end of the dumping hopper 13 is held at the same height as the height H of the rubble layer _C1 to be formed, and therefore, at that position, the rubble from the dumping hopper 13 forms a pile of height H. A predetermined angle of repose is maintained. The disposal hopper 13 has a predetermined width, for example, about 5 m.

In this state, raise the lower end of the dumping hopper 13 to a height H.
The wire 7b is pulled while the wire 7a is loosened, and the disposal hopper 13 is moved to the position indicated by the broken line X in FIG. 2 while maintaining the vertical position. At this time, the hydraulic cylinder device 12 is contracted and the hydraulic cylinder device 14 is expanded. Then, the rubble layer _C1 is formed with a predetermined width corresponding to the moving distance L (for example, 15 m). At this time, leveling work is also done at the same time. Then, with the dumping hopper 13 held at position X, the mooring winch 18 of the ship 1 is operated, and the ship 1 is moved to the left in FIG. 2 by a distance substantially equal to the moving distance L. At that time, it goes without saying that the wires 7a, 7b and the hydraulic cylinder devices 12, 14 are operated. Such operations are repeated to form a layer of rubble of a predetermined width while leveling it out.

Next, the ship 1 is moved by a predetermined width in the width direction (vertical direction in FIG. 3), and the same operations as described above are repeated. By doing this, a layer of rubble is formed in a predetermined area.
Form C ₁ . Similarly, rubble layer C ₂ and
Form C ₃ sequentially.

In addition, each rubble layer C ₁ , C ₂ , formed in one operation
The height H of C ₃ is preferably about 3 to 3.5 m, and therefore the number of rubble layers, that is, the number of times of leveling, may be appropriately selected depending on the height of the rubble layer to be formed.
Now, the upper surface of the uppermost rubble layer _C3 must be leveled relatively precisely (for example, within 5 cm) as a base level, especially in order to install a structure.

For this purpose, according to the present invention, an underwater girder is installed and the dumping hopper is guided by the underwater girder, thereby achieving uniform leveling work. An example thereof is shown in FIGS. 4 and 5.
In Figures 4 and 5, Figures 2 and 3
Portions corresponding to the figures are designated by the same reference numerals and redundant explanation will be omitted.

After forming the uppermost rubble layer _C3 , an underwater girder indicated by 20 is installed horizontally on the rubble layer _C3 . This underwater girder 20 is configured in a square shape with two dumping hopper guide girders 21 and 22 extending in parallel and support girders 23 and 24 provided at both ends of the guide girders 21 and 22. , 24 are provided with oil jacks 25 at both ends. The guide beams 21 and 22 are provided with a guide member 2 that can move along the guide beams 21 and 22 with the guide beams 21 and 22 sandwiched between a plurality of rollers 26.
7 and 28 are provided, and these guide members 27 and 28 are attached to both sides of the disposal hopper 13 in the width direction, respectively. Therefore, the underwater girder 20 is the topmost rubble layer.
Install it on C ₃ and remotely control the oil jack 25 to bring out the level of the underwater girder 20. Next, rubble is supplied from the rubble hopper 4 in a timely manner, and as shown in Figs.
As explained with reference to the figures, the disposal hopper 13 is moved while being guided by the underwater girder 20. As the dumping hopper 13 moves, its lower end performs leveling work on the upper surface of the uppermost rubble layer _C3 at a height specified by the underwater girder 20.

When the work in the length direction is completed in this manner, the horizontal girder 20 is moved in the width direction using, for example, a crane ship, and the same work is repeated. In this way, the work of leveling the upper surface of the uppermost rubble layer _C3 is completed.

As described above, according to the present invention, by simultaneously supplying rubble from the dumping hopper to the bottom of the water and moving the dumping hopper, it is possible to perform the charging and leveling work of the rubble at the same time in one step. Therefore, work efficiency is significantly improved. Furthermore, since the rudder can be raised and retracted, the dumping hopper can always be positioned at an appropriate position depending on the height of the water level.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a basic structure for constructing an underwater structure, FIG. 2 is a side view of an underwater screed device implementing the present invention, and FIG. 3 is a plan view of the underwater screed device shown in FIG. 2. FIG. 4 is a side view of an underwater screeding device used for leveling with relatively high flatness, and FIG. 5 is a plan view of the underwater screeding device shown in FIG. 4. 1... work boat, 2... anchor, 4... rubble hopper,
5... Belt conveyor, 6... Ladder, 7a, 7b...
Wire, 8... Derrick, 12... Hydraulic cylinder device, 13... Dumping hopper, 14... Hydraulic cylinder device, B... Water bottom, C ₁ , C ₂ , C ₃ ... Rubble layer.

Claims (1)

[Claims] 1. A work boat is moored at a predetermined position, rubble is sent from the work boat to a dumping hopper via a telescoping and elevating ladder, and the dumping hopper is held in a vertical position at a predetermined height. The rudder is moved by extending, contracting and lifting up to form a rubble layer, and after moving a predetermined distance,
The work boat is moved by extending/contracting and elevating the rudder with the dumping hopper stopped, and after a rubble layer of a predetermined length is formed, the work boat is moved in the width direction, and the above operations are repeated. Underwater screed method. 2 A work boat that can be moored in place with an anchor,
A rubble hopper installed on the work boat, a belt conveyor that sends rubble from the rubble hopper, an elevating and telescopic ladder extending toward the bottom from the end of the belt conveyor, a device for elevating the rudder, and the rudder. What is claimed is: 1. An underwater screed device comprising: a hydraulic cylinder device that expands and contracts the screed, a dumping hopper pivotally attached to the tip of the ladder, and a hydraulic cylinder device that pivots the dumping hopper with respect to the ladder.