JPH0726580A - Device for raising earth by grab - Google Patents

Abstract

PURPOSE:To undertake a dredging work by holding and raising sediment or the like on sea and river bottoms with a grab, while reducing the contamination of water as much as possible. CONSTITUTION:A pair of scooping plates 13 and 13 are rotatably provided within a pair of shells 10 and 10 capable of being opened and closed, and the shells 10 and 10 are closed on the water bottom. Sediment or the like is thereby held and scooped with the plates 13 and 13. Furthermore, the sediment or the like is fed forcibly into a discharge pipe 6 via the forward turning motion of the plates 13 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grab hoisting device for dredging the seabed, riverbed and the like.

[0002]

2. Description of the Related Art Conventionally, the dredging means using a general grab is
Grabs directly grab the seabed, riverbed mud, rocks, etc., and hoist them together with grabs and lift them up to the earth carrier.

[0003]

However, in the conventional dredging means such as the seabed and riverbed, since the grab is capable of hoisting underwater or underwater while grasping mud or the like,
During the lifting or during the lifting, mud accumulated on the seabed or riverbed, or mud spilled from the grab is scattered in the sea or underwater and causes pollution of seawater or river water. Since heavy grabs have to be lifted from the seabed, riverbed to earth-moving vessels, there is the problem of consuming a lot of power.

The present invention has been made in view of the above circumstances. It is possible to unload the mud grasped by the grab up to an earthmoving ship through an unloading pipe without lifting the grab from the seabed or riverbed. It is an object of the present invention to provide a novel grab hoisting device capable of performing desired dredging while reducing water pollution as much as possible and saving energy.

[0005]

In order to achieve the above object, a feature of the present invention is that a support frame, a pair of shells pivotally supported on the support frame so as to be vertically openable and closable, and the pair of shells. Drive device for forcibly opening and closing the shell of the shell, a pair of scooping plates rotatably provided in the pair of shells in the same opening and closing direction, and a scooping plate for driving the pair of scooping plates to rotate. An upper plate driving device, and an earthing pipe having an inlet that is opened in the closed scooping chamber defined by the shell when the shell is closed and that is opened and closed by the scooping plate and an outlet that projects above the water surface. A regulating valve is provided in the lower part of the hoisting pipe to allow the introduction of mud and the like into the hoisting pipe, but to prevent its discharge.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a usage state of the device of the present invention,
2 is a side view of the glove showing a state of starting to grab mud or the like, FIG. 3 is a partially enlarged sectional view taken along line 3-3 of FIG. 2, and FIG. 5 is a vertical sectional side view of an essential part of the grab showing a state in which mud or the like is grasped, FIG. 6 is a vertical sectional side view of an essential part of the grab showing a state in which the mud or the like is pushed into an excavation pipe, and FIG. It is a principal part longitudinal cross-sectional side view of a grab which shows the state at the time of the completion of the earth lifting process.

In the present embodiment, the case of dredging the seabed is performed. In FIG. 1, the crane 2 is attached to the hull 1 of the grab boat.
Is mounted, and a grab 5 is suspended and supported at the tip of a wire 4 fed from a winch 3 provided in the crane 2. A hoisting pipe 6 is connected to the grab 5, the hoisting pipe 6 extends to the sea, and its free end is supported by the earth carrier 7.

Next, the structure of the grab hoisting device will be described with reference to FIGS. 2 to 7. The glove 5 suspended and supported by the tip of the wire 4 is provided on the support frame 8 and on both left and right sides of the support frame 8. It is provided with a pair of shells 10, 10 that are axially supported to be openable and closable vertically. The support frame 8 is formed in a fork shape with both left and right side surfaces and the lower surface open, and the tip of the wire 4 is bonded to the upper portion thereof.
Each shell 10 has two side plates 10 ₁ and 10 ₁ that are parallel to each other.
Are integrally joined by a bottom plate 10 ₂ to form a bucket shape, and the upper and lower surfaces and the inner surface thereof are open.
The inner upper part of the pair of shells 10, 10 is a substantially horizontal pivot 1
1 and 11 are rotatably supported on the lower portions of both sides of the support frame 8 so as to be openable and closable. The pair of shells 10, 1
The inner upper edges of 0 are connected to each other by a shell driving device 12 composed of a hydraulic cylinder.
A pair of shells 10 and 10 are pivoted by a telescopic drive of 2
Opening and closing can be performed synchronously around 1 and 11.

Further, the scooping plates 13, 13 are respectively housed in the pair of shells 10, 10 so as to be rotatable in the same direction as the opening and closing direction of the shells 10, 10. Each scooping board 13
A plurality of reinforcing ribs 13 ₂ ··· are integrally welded to the back surface of a steel plate 13 ₁ that spreads in the shell 10 in the width direction, and the upper portions of the reinforcing ribs 13 ₂ ··· are the upper walls of the shell 10. These reinforcing ribs 1 extend upward through the
The base of 3 ₂ ··· has a plurality of brackets 18 ··· that are integrally provided on the outer upper edge of the shell 10,
・ Has a pivotally supported shaft. Further, the bent base ends of the reinforcing ribs 13 ₂ are connected 17 to a scooping plate driving device 15 composed of a plurality of hydraulic cylinders by means of a support shaft 16 pivotally supported on the lower outside of the support frame 8. The two pairs of scooping plate driving devices 15, 15 corresponding to the pair of scooping plates 13, 13 are expanded and contracted in synchronization with each other, whereby the pair of scooping plates 13, 13 are moved in the pair of shells 10, 10. The shells 10 and 10 can be rotated in the same direction as the opening and closing direction of the shells 10, and as will be described later, the mud on the seabed is
You can pick up within 0, 10.

As shown in FIG. 1, in the lower part of the hoisting pipe 6 which is unloaded from the earthmoving ship 7 to the bottom, there are integrally formed bifurcated introduction ports 6 ₁ , 6 _1. The introduction ports 6 ₁ and 6 ₁ are integrally provided on the support frame 8. The lower ends of the introduction ports 6 ₁ and 6 ₁ are formed into diagonally cut inlets 6i and 6i, and these inlets 6i and 6i are closed by the scooping plates 13 and 13 when they are rotated forward. It has become. Also the introduction port 6 _1, 6 _1, wherein the rake upper 13 of the scooping guide frame 19 for sliding contact guide the tip of the upper plate 13 and 13 are vertically integrated, the guide frame 19, 1
The left and right outer surfaces facing 3 are arcuate concave surfaces 19 ₁ , 19 ₁
Are formed on the circular arc concave surfaces 19 ₁ , 19
₁ slides and guides the tips of the scooping plates 13, 13 when they are rotated.

As shown in FIG. 5, a pair of shells 10, 1
When 0 is closed, the shells 10, 10 and the guide frame 19 form a closed scooping chamber C in the shells 10, 10, and the scooping chamber C has the introduction port 6 _1. , 6 ₁ inlets 6i, 6i are opened.

As shown in FIG. 1, the unloading pipe 6 passes through the sea and its upper end projects above the sea, and the outlet 6 at its upper end.
e and 6e are opened on the earth carrier 7.

In the lower part of the introduction ports 6 ₁ and 6 ₁ ,
The adjusting valves 20 and 20 each of which is a flap valve are rotatably supported by the shafts 21 and 21. These adjusting valves 20, 20
Rotates downward due to its own weight, and the introduction port 6 ₁ ,
6 ₁ seated on the valve seat surface 22, 22 formed, is held in the closed position, and is opened by upward rotation.

The adjusting valves 20 and 20 may be held in the closed position by a biasing member such as a spring.

Reference numeral 23 in the drawing is a weight reducing opening opened in the support frame 8.

Next, the operation of this embodiment will be described.

.. As shown in FIGS. 2 to 4, the pair of shells 10 and 10 are moved to the fully open position and the scooping plates 13 and 13 are moved to the retracted position by the contraction operation of the shell driving devices 12 and 12 and the scooping plate driving devices 15 and 15. Grab 5 is lowered to the seabed while holding it. At this time, the lower parts of the pair of shells 10, 10 and the scooping plates 13, 13 bite into the mud on the seabed due to the weight of the entire grab 5.

.. Next, as shown in FIG. 5, while holding the pair of scooping plates 13 and 13 in the retracted position, the pair of shells 10 and 10 are rotated in the closing direction by the extension operation of the shell drive devices 12 and 12 so that the shells are fully closed. Close. At this time, a pair of scooping plates 1
3 and 13 cooperate with a pair of shells 10 and 10 to grasp the mud on the seabed in the shells 10 and 10,
It is accommodated in the scooping chamber C formed inside 10.

[0020]. Next, as shown in FIG. 6, the pair of scooping plates 13, 13 are moved by the extension operation of the scooping plate driving devices 15, 15.
If you move forward, that is, rotate it upward, this scooping plate 13, 1
The mud or the like in the scooping chamber C is scooped by 3 and pushed into the introduction ports 6 ₁ , 6 ₁ . At this time, the introduction port 6 ₁ ,
6 regulating valve 20, 2 by pushing force of the mud or the like enters into the ₁
0 is opened and mud is pushed upward through the introduction ports 6 ₁ , 6 ₁ .

[0021]. When one push-in process by the pair of scooping plates 13 and 13 is completed, the scooping plates 13 and 13 are retracted by the expansion operation of the scooping plate driving devices 15 and 15 to introduce the introduction ports 6 ₁ and 6 _{For the} mud and the like in ₁ which is heavier than water, the regulating valves 20 and 20 are closed by its own weight so that the mud and the like do not return to the shells 10 and 10. In this case, seawater will not enter the introduction ports 6 ₁ , 6 ₁ .

.. When the scooping plates 13 and 13 are moved to the retracted position, the entire grab 5 is pulled up to a position away from the seabed as shown in FIG. 7, and then the contraction operation of the shell drive devices 12 and 12 substantially opens the pair of shells 10 and 10. The glove 5 is opened to the position, the glove 5 is moved to the next dredging position, and the glove 5 is dropped to the seabed again to perform the above-mentioned process.

.. By repeating the above steps, mud and the like are sequentially pushed up from the introduction ports 6 ₁ and 6 ₁ through the hoisting pipe 6 and hoisted to the earth carrier 7.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments are possible within the scope of the present invention. For example, although the case where the seabed is dredged has been described in the above embodiment, it goes without saying that the riverbed, the lakebed, etc. are dredged. Further, in the above embodiment, the pair of shells is driven by one driving device, but they may be separately driven by a plurality of driving devices, and the pair of scooping plates are driven by another driving device. However, they may be driven by a common driving device. Further, it goes without saying that it is possible to use a drive device other than the hydraulic cylinder as the drive device.

[0025]

As described above, according to the present invention, the support frame, the pair of shells pivotally supported by the support frame so as to be vertically openable and closable, and the shell drive device for forcibly opening and closing the pair of shells. And a pair of scooping plates provided in the pair of shells so as to be rotatable in the same opening and closing direction,
A scooping plate driving device that rotationally drives the pair of scooping plates, an inlet and a water surface that are opened in the closed scooping chamber defined by the shell when the shell is closed and are opened and closed by the scooping plate. It is composed of a hoisting pipe having an outlet projecting upward, and a regulating valve provided in the lower part of the hoisting pipe to allow introduction of mud and the like into the hoisting pipe but prevent its discharge. Therefore, while holding the grab on the bottom of the water, you can lift the mud on the bottom of the water through the hoisting pipe by simply changing the gripping position, and you can continue the dredging work without lifting the grab, It is possible to reduce water pollution due to scattering of mud and the like as much as possible, and significantly reduce power consumption to contribute to energy saving.

[Brief description of drawings]

FIG. 1 is a diagram showing a usage state of the device of the present invention.

FIG. 2 is a side view of the grab showing a state where gripping of mud or the like is started.

FIG. 3 is a partially enlarged sectional view taken along line 3-3 of FIG.

FIG. 4 is a vertical sectional side view of a main part of FIG.

FIG. 5 is a vertical sectional side view of a main part of the grab showing a state in which mud or the like is grasped.

FIG. 6 is a side view showing a state in which mud or the like is pushed into a hoisting pipe.

FIG. 7 is a vertical cross-sectional side view of the main part of the grab showing the state at the end of the one-lifting process.

[Explanation of symbols]

 1 hull 6 unloading pipe 6i unloading pipe inlet 6e unloading pipe outlet 8 support frame 10 shell 12 shell driving device 13 scooping plate 15 scooping plate drive C scooping chamber

Claims (1)

[Claims] 1. A support frame (8), a pair of shells (10, 10) axially supported by the support frame (8) so as to be vertically openable and closable, and the pair of shells (10, 10) are forced. Shell driving device (12, 12) for opening and closing, and a pair of scooping plates (13, 13) rotatably provided in the pair of shells (10, 10) in the same opening and closing direction.
A scooping plate driving device (15, 15) for rotationally driving the pair of scooping plates (13, 13); and the shell (10, 1).
0) When closed, it is projected into the water surface and the inlets (6i, 6i) opened in the closed scooping chamber (C) defined thereby and opened and closed by the scooping plate (13, 13). And a discharge pipe (6e) having an outlet (6e), and a discharge pipe (6) provided at the lower part of the discharge pipe (6) to allow introduction of mud and the like into the discharge pipe (6). A grab hoisting device, comprising a regulating valve (20, 20) for blocking.