JPH0739950Y2 - Grab frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved grab dredging fence that prevents the diffusion of polluted water during grab dredging when excavating underwater.

Conventionally, a grab frame prevention film has been proposed to prevent the diffusion of pollution when performing grab dredging. However, in these conventional grab frame prevention films, the canvas sheet swells inward or rises upward due to the fluid pressure, so when the glove is thrown in or pulled up, the canvas sheet surrounded by a square is caught by the claws or corners of the glove. There were many accidents that caused damage, resulting in the spread of dredging pollution.

The present inventor has completed the present invention as a result of various studies in order to solve these conventional drawbacks.

That is, according to the present invention, the inner surrounding floating body is fixed to the inside of the outer surrounding floating body by a support, the supporting body is provided almost vertically on the inner surrounding floating body, and the upper surrounding floating body is provided at the tip thereof, and the upper surrounding floating body and the inner surrounding floating body are provided. And a surrounding fence is provided inside the outer surrounding floating body, and the surrounding fence is laterally provided with appropriate intervals on the fence forming holder, and the lower part of the fence has a double film structure, and a ballast is provided at the lower part of the fence. It is an improved grab frame characterized by.

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a state in which a part of the upper surrounding floating body of the improved grab frame according to the present invention is cut away. First, the present invention forms a floating body for holding a fence of a grab frame. This floating body is, as shown in FIG. 1, an outer surrounding floating body 1
Is provided in the shape of a quadrangle, and the inner surrounding buoyant body 2 in the shape of a quadrangle smaller than the outer surrounding floating body 1 is provided inside thereof. This outside floating body 1
The inner surrounding floating body 2 is fixed by the support body 3. Since the support 3 is intended for fixing, a rod-shaped body is sufficient, but if a floating body is used as the support, the buoyancy of the entire grab frame is increased, which is preferable. An upper surrounding floating body 5 is provided on the upper side of the inner surrounding floating body 2 via a support body 4.

An upper fence 7 is stretched on the inner side from the upper surrounding floating body 5 to the inner surrounding floating body 2 and the outer surrounding floating body 1 of the floating body configured as described above, and the surrounding fence 6 is hung on the outer surrounding floating body 1.

As shown in FIG. 2, the surrounding fence 6 includes an intermediate fence 8 and an outer lower fence 9 provided near the lower end thereof.
And the inner bottom fence 10. And as shown in FIG. 3, the upper fence 7 and the middle fence 8
A double structure W is formed in the vicinity of a boundary portion between and. By forming the boundary between the upper fence 7 and the intermediate fence 8 into a double structure, a ballast 11 is provided at the lower end of the intermediate fence 8.
Is provided to prevent the intermediate fence 8 from curling up.
Further, a ballast 12 is provided at the lower end of the outer lower fence 9, and a ballast 13 is also provided at the lower end of the inner lower fence 10.
To provide.

In this way, by providing the ballast 11 at the lower end of the intermediate fence 8, the surrounding fence 6 can be always kept in a hanging state, and the phenomenon of curling up can be prevented even by a certain amount of water flow. Also, when grab dredging is performed by providing an outer lower fence 9 and an inner lower fence 10 near the lower end of the middle fence 8 to form a double structure, polluted water may flow out from the lower end of the grab frame to the outside of the frame. The preventive effect is increased.

The surrounding fence 6 used in the present invention has a shape-retaining body 13 for holding the surrounding shape of the fence in the middle fence 8 part.
Is provided in the lateral direction of the intermediate fence 8. This shape retainer
13 may be provided at appropriate intervals in the vertical direction of the intermediate fence 8.

As the shape-retaining body 13, for example, as shown in FIG. 4, a pipe 14 is provided in a state of going around the intermediate fence 8 and
The shape of the intermediate fence 8 is maintained by inserting the rope 15 into the pipe 14. When the pipes are connected and used, a short pipe 16 may be jointed as shown in FIG. In this case, it is preferable that the pipe is provided with an edge pipe 17 so that the short pipe 16 is not broken.
Further, in order to reinforce the fence 8, for example, synthetic resin or other rod-shaped or plate-shaped reinforcement 18 is provided in the vertical and horizontal directions to further improve the shape retention of the intermediate fence 8. .

As a means for mounting the surrounding fence 6 on the floating body, for example, a D-can metal fitting is provided on each floating body, and a mounting metal fitting is provided on the shape-retaining holding body 13 provided on the fence 6, and the D-can metal fitting is shackled. Can be installed.

The upper surrounding floating body 5 is provided with a guard pipe 19 so as to project to the outside so as not to be damaged even if the dredger collides with it.

In the grab frame of the present invention, in order to adjust the length of the fence 6 according to the water depth, the tip of the rope 15 is fixed to each shape retainer 13, and the other end is wound around the winch 20 provided in the guard pipe 19. .

As another aspect of the present invention, as shown in FIG. 6, a part of the surrounding fence 6 has an upper fence structure as shown in FIG. 2, and the shape retaining float 21 is attached to the upper fence portion of another surrounding fence 6. Since the surrounding fence 6 can be always pulled up to the upper side by the provision of, the surrounding fence 6 is prevented from being dropped by the grab and damaged when the surrounding fence 6 hangs down.

Since the improved grab frame of the present invention can always keep the expanded state of the surrounding fence 6, the surrounding volume of the fence is increased, so that a large-capacity grab can be used and the working efficiency is significantly improved.

Further, the grab frame of the present invention is provided with an upper fence from the upper surrounding floating body to the inner surrounding floating body and the outer surrounding floating body, thereby completely preventing the polluted water in the surrounding from flowing out of the glove frame even when the waves are high. You can

[Brief description of drawings]

FIG. 1 shows a plan view of a grab frame in which a part of the upper surrounding floating body is cut out, FIG. 2 shows a sectional view showing a state in which the surrounding fence is extended on the floating body, and FIG. 3 shows a part of the fence. FIG. 4 shows a side view, FIG. 4 shows a partial sectional view of the shape-retaining body,
FIG. 5 shows a state diagram of the improved grab frame of the present invention,
FIG. 6 shows a state diagram of a grab frame showing another embodiment.

Claims (1)

[Scope of utility model registration request] 1. An inner surrounding floating body is fixed to the inside of the outer surrounding floating body by a support, a supporting body is provided substantially vertically on the upper portion of the inner surrounding floating body, and an upper surrounding floating body is provided at the tip end portion thereof, and the upper surrounding floating body is provided. , An upper fence is stretched inside the inner surrounding floating body and the outer surrounding floating body, the surrounding fence is hung on the outer surrounding floating body, and the shape retaining members of the surrounding fence are provided laterally on the surrounding fence at appropriate intervals. A graph frame, characterized in that the lower part of the fence has a double film structure, and ballasts are provided on the lower parts of the fence.