JPH0313372B2 - - Google Patents

Description

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

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.

Generally, in order to construct underwater structures, rubble is introduced from a work boat through a ladder extending downward, and the rubble is leveled at the tip of the ladder.
It is known from Japanese Patent Application Laid-open No. 81531 and Japanese Patent Application Laid-Open No. 72118/1983. However, since the long ladder in the water is swayed by tidal currents, etc., the thickness of the rubble layer is not uniform during leveling work.
For this purpose, for example, the technique described in the above-mentioned Japanese Patent Application Laid-Open No. 57-81531 is provided with a filling frame in which a scraper is movably provided, resulting in a complicated structure.

Further, in the technique described in the above-mentioned Japanese Patent Application Laid-open No. 51-72118, a tensile force is applied in the traveling direction of the work boat using a wire, but it is susceptible to the effects of waves and tidal currents.

Furthermore, in JP-A No. 56-6827, a marine work boat is installed, and stones are fed from the Gatsuto boat into a charging hopper provided on a cart that can be moved back and forth and from side to side on a workbench using a conveyor, and stones are loaded from the loading hopper. A technique for constructing an underwater mound by sending it via a conveyor to a chute is disclosed.

However, the known technology requires two pieces of equipment, an offshore work platform and a Gatsuto ship, and especially when the mound to be constructed is wider than the movement range of the cart on the work platform, the offshore work platform must be moved. However, since the offshore work platform is installed on the seabed, it is very troublesome to move it and the construction period is long.

Furthermore, Japanese Patent Laid-Open No. 119035/1983 discloses an apparatus for removing sand for lining from soft soil, but such known technology cannot spread the sand evenly.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a simple underwater screed device that allows the work of putting in rubble stones to be carried out smoothly and maintains a predetermined horizontal surface during the leveling work.

According to the underwater screeding device 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 near the end of the belt conveyor. It is equipped with a tripper that is movable on the tripper, and a trolley that is located below the tripper and can run on a pair of rails parallel to the belt conveyor, and the pair of rails are laid on a work boat. Furthermore, there is a telescopic ladder extending from the trolley toward the bottom of the water, a support wire for supporting the ladder in a predetermined position, a wrapping device for expanding and contracting the ladder, and a drop-off hopper pivotally attached to the tip of the ladder. and a hydraulic cylinder device for pivoting the dumping hopper with respect to the ladder.

Therefore, by holding the dumping hopper in a vertical position at a predetermined height from the water bottom and supplying rubble, moving the tripper and cart, and moving the dumping hopper together with the rudder, it will be possible to reach the predetermined height from the water bottom. A rubble layer 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.

The distance that the dumping hopper can be moved by moving the tripper cart is limited, so after moving the ladder a certain length and moving the dumping hopper, move the work boat and move the tripper and cart again. Move the rubble stone hoppa. Since the width of the rubble hopper is limited, after completing the leveling of the rubble in the longitudinal direction, 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. Even if the ladder is tilted during horizontal movement, the support wire and hydraulic cylinder device can be expanded and contracted to hold the dumping hopper in the correct vertical position. The top surface of the rubble layer can be screeded to provide a substantially horizontal surface.

An apparatus for implementing the present invention will be described below with reference to FIGS. 2 to 4.

In FIGS. 2 to 4, 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 4 in the general direction, a tripper 6 that is movably provided near the end of the belt conveyor 5, and a tripper 6 located below the tripper 6 and parallel to the belt conveyor 5. It is equipped with a truck 8 that travels on a rail 7 provided at the bottom, and a pipe or ladder 9 that receives rubble from the belt conveyor 5 via the tripper 6 and the truck 8 and sends it to the bottom B. This truck 8 is composed of a stone crushing truck section 8a that supplies rubble from the belt conveyor 5 and the torturer 6 to the ladder 9, and a traveling truck section 8b that runs on the rails 7. 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 tripper 6 is movable on a belt conveyor, and the traveling cart 9 is also designed to freely travel on rails. As a moving device for the tripper 6 and the traveling carriage 9, any mechanical or electrical means such as a take-up reel or a motor vehicle can be used.

Reference numeral 12 in FIG. 2 is a support wire for supporting the ladder at a predetermined position. Further, numeral 13 in FIG. 4 indicates a jacket holder.

The ladder 9 has a first ladder part 9a which is connected at one end to the stone crushing cart part 8a, and which receives rubble sent from the belt conveyor 5 and the tripper 6, and a second ladder part which is slidably fitted into the first ladder part 9a. The first ladder portion 9a and the second ladder portion 9b are extendably connected by a winding device 14 such as a pulley.

A dumping hopper 15 is pivotally attached to the tip of the second ladder portion 9b, and even if the inclination angle of the ladder 9 changes, the dumping hopper 15 expands and contracts the hydraulic cylinder 16 to pivot the dumping hopper 15. This allows it to be held in the correct vertical position. In operation, rubble from the rubble hopper 4 is sent from the vibrating feeder 10 via the conveyor 11 to the belt conveyor 5, and is stored in the dumping hopper 15 via the tripper 6, the crushed stone truck section 8a and the ladder 9. The lower end of the dumping hopper 15 is held at the same height as the height H of the rubble layer _C3 to be formed, and therefore, at that position, the rubble from the dumping hopper 15 forms a pile of height H. A predetermined angle of repose is maintained. This disposal hopper 15
has a predetermined width, for example, about 5 m.

In this state, if you move the tripper 6 and the traveling carriage part 8b (to the left in FIG. 2), the dumping hopper 1
5 moves horizontally by a distance L while maintaining the height H. Then, the rubble layer _C3 is formed with a predetermined width corresponding to the moving distance L (for example, 15 m). that time,
Leveling work is also done at the same time. In this case, it goes without saying that the support wire 12 can be appropriately wound and pulled out. Even if the ladder 9 is tilted during horizontal movement, the hydraulic cylinder 16 can be expanded and contracted to pivot the dumping hopper 15.
It is possible to hold the dumping hopper 15 in the correct vertical position. In addition, since the traveling cart portion 8b is always positioned below the tripper 6, all of the crushed stone carried by the belt conveyor 5 is supplied to the ladder 9 without waste via the crushed stone cart portion 8a.

Next, while maintaining the horizontal position of the dumping hopper 15, the general 1 mooring winch 18 is operated, and the ship 1
is moved to the left in FIG. 2 by a distance substantially equal to the moving distance L. 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 ₃ . The rubble layers C ₁ and C ₂ were formed sequentially by the same procedure. When forming the rubble layer one after another, it is necessary to raise the dumping hopper 15 to the height of the rubble layer to be formed each time.

In the present invention, the height is adjusted by extending and contracting the first ladder section 9a and the second ladder section 9b that is slidably fitted thereto using the pulley device 14. That is, in a winding device, for example, a pulley device 14, the upper pulley 1 is fixed to the first ladder portion 9a.
The distance between the upper pulley 14a and the lower pulley 14b can be reduced by winding or pulling out the intermediary node (rope, chain, etc.) wound around the lower pulley 14b fixed to the second ladder section 9b. adjust,
First ladder part 9a and second ladder part 9
This controls the sliding expansion and contraction with b. Here, the winding device 14 may employ any winding transmission mechanism such as not only a pulley but also a chain and a sprocket.

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.
The upper surface of the uppermost rubble layer _C3 is preferably leveled relatively accurately (within 5 cm, for example) as a base level, especially in order to install a structure. Moreover, the size of the rubble, that is, crushed stone, is preferably 5 to 200 kg each.

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. Further, since the ladder is movable in the horizontal and vertical directions, 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 front 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 FIG. 2. 1... work boat, 2... anchor, 4... rubble hopper, 5... belt conveyor, 6... tripper, 7... rail, 8... bogie, 9... ladder,
14... Winding device, 15... Throwing hopper, 1
6... Hydraulic cylinder device, B... Water bottom, C ₁ , C ₂ ,
C ₃ ...Rubble layer.

Claims (1)

[Claims] 1. A work boat that can be moored in place with an anchor,
A rubble hopper installed on the work boat, a belt conveyor for sending rubble from the rubble hopper, a tripper installed near the end of the belt conveyor so that it can be moved over it, and a belt conveyor located at the bottom of the tripper. and a dolly that can run on a pair of rails parallel to the work boat, and the pair of rails are laid on the work boat, and a telescoping rudder that extends from the dolly toward the bottom of the water, and supports the rudder in a predetermined position. the ladder, a winding device for expanding and contracting the ladder, a dumping hopper pivotally attached to the tip of the ladder, and a hydraulic cylinder device for pivoting the dumping hopper with respect to the ladder. An underwater screed device characterized by: