JPH0338372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dredged soil suction pipe obstruction removal device. More specifically, the present invention particularly provides that, when dredged soil containing a large amount of stone, wood, and other debris is sucked in from an urban river, a port, etc. using a centrifugal sand pump, obstacles such as garbage may be removed from the suction pipe. In order to prevent this, it is necessary to remove potential obstructions from the suction pipe without stopping pump operation. This is a device that captures and removes particles along the way.

[Conventional technology]

The sedimentary soil of urban rivers and ports is contaminated with stones, wood, and other large and small garbage that have flowed in or been thrown in from surrounding waters, and the pollution is particularly severe in areas surrounding large cities. In recent years, construction work has been underway to remove these debris and purify water bodies, but these contaminants often interrupt work and hinder efficiency, so it is difficult to effectively remove obstructions. It is extremely important to use continuous removal equipment and to be able to operate continuously. In particular, when direct dredging is performed using a pump dredger, or dredged soil is dredged by a grab dredger or other equipment and loaded onto an earth transport vessel, it is sucked up by a pump-type barge unloader at the disposal site and pumped into the disposal site. In some cases, conventional devices include a grating at the inlet of the suction tube or at the front of the pump to prevent these obstructions from being sucked in.

Or, instead of having a grating at the front of the pump,
Obstacles are removed by installing a stone box in the middle of the suction pipe leading to the pump and submerging them into the stone box.

[Problem that the invention seeks to solve]

However, if a grid is provided, a grid with a small gap will easily become clogged, so since the gap is made large enough to allow the pump to pass through, flat and long objects are often sucked in and pulled inside the suction pipe or pump. This can lead to pipe blockage due to the accumulation of other obstructions, and it takes a lot of time to open and remove the pipes and pumps, which significantly impedes operational efficiency. It had the drawbacks of longer construction times and higher construction costs.

In addition, if a stone box is installed, large items,
Even if it is long, if it is light, it will pass through the stone box and get caught inside the pump, so it has the same drawback.

Therefore, an object of the present invention is to provide two dust eliminators suitable for removing large objects, long objects, etc., to efficiently remove these obstacles, and to prevent one dust eliminator from exceeding its limit. If the dust eliminator becomes blocked, it switches to the other dust eliminator and removes the obstruction.During that time, the blocked dust eliminator removes the obstruction, completes preparations for the next changeover, and continuously removes trash without stopping dredging operation. An object of the present invention is to provide a device for removing obstructions in a dredged earth and sand suction pipe for dredging and lifting work of earth and sand containing a large amount of earth and sand.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes a suction pipe having two branch pipes, and a suction pipe installed downstream of the suction pipe, which suctions and pressurizes a mixed fluid of earth and water through the suction pipe. and a dust eliminator provided on each branch pipe, each dust eliminator having a cylindrical body and a pivot pin attached to the outer periphery of the cylindrical body, and a dust eliminator installed on the side of the cylindrical body. a substantially semicircular lid attached to the lid so that it can be opened and closed; a grating that is attached to the inside of the lid and is made up of a plurality of arcuate bars centered on the pivot pin;
Provided is a dredged soil suction pipe obstruction removal device characterized by having the following.

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a diagram schematically showing the configuration of a dredged sediment suction pipe obstruction removal device of the present invention, and FIG. 2 is a front view of a dust eliminator used in the dredged sediment suction pipe obstruction removal device.

The dredged soil suction pipe obstruction removal device of the present invention is preferably installed on a barge unloader ship, but is not limited thereto. Suction pipe 1
Dredged soil is sucked in alternately from the left and right tips of 0. Therefore, for example, when suction is taken from the left end of the suction pipe, the hydraulic gate valve 20a is closed.
On the other hand, the hydraulic gate valve 20b is opened. Suction pipe 10
Left and right branch pipes 10a and 10b are provided, and a sand pump 12 is arranged downstream of the suction pipe 10. Dust eliminators 14a, 14b and related parts are attached to each branch pipe 10a, 10b, but since these are the same, the reference numerals have a suffix "a" and "b".
The following explanation will be given only for the parts on the right side (suffix "a"), and the parts on the left side (suffix "b") will be omitted.

A hydraulic gate valve 20a is provided before entering the branch pipe on the upstream side of the suction pipe, and in the branch pipe 10a, hydraulic gate valves 16a and 18a are provided before and after the dust eliminator 14a. The dust eliminator 14a is provided with a differential pressure switch 22a, which senses the degree of clogging of the dust eliminator and generates a signal when the pressure exceeds a limit. In addition, a water supply pipe 24 is arranged,
Water is supplied from the water supply pipe 24 to the dust eliminator 14a through the hydraulic butterfly valve 28a and the water supply branch pipe 26a. A dust hopper 30 is arranged between the two dust eliminators, and obstacles removed by the dust eliminators are temporarily stored therein.

Next, the structure of the dust eliminator will be explained with reference to FIG. In FIG. 2, the dust eliminator 14a on the right side is shown with its lid open, and the dust eliminator 14b on the left side is shown with its lid closed.
Roughly speaking, the dust eliminator 14a includes a main body 40 that is a cylindrical tank, and a lid 42 that is attached to the main body 40 so as to be openable and closable. In addition,
A watertight packing is attached around the opening of the main body 40 to the lid 42, and the lid 42 constitutes a sealed lid. Attachment 4 is attached to the upper outer periphery of the main body 40.
8 is fixed, and a hydraulic cylinder 46 is attached to the fixture 48 via a pivot pin 50. Further, a fixture 54 is fixed to the upper part of the outer periphery of the main body 40, and a lever 56 is attached to the fixture 54 via a pivot pin 60. One end of the lever 56 is rotatably connected to a piston rod (plunger) 52 of the aforementioned hydraulic cylinder 46 via a pivot pin 58.

The lid 42 is rotatably mounted on the aforementioned pivot pin 60 and is connected to the other end of the lever 56 via its mount 68, pivot pin 64, rod 66, and pivot pin 62. Therefore, when the hydraulic cylinder 46 is operated to retract its piston rod 52, the lid 4
2 is rotated upward about the pivot pin 60 and opened. In this state, the hook 70 is engaged with the pivot pin 58, and the lid 42 is maintained in the open state. The lid 42 is also closed when the hook 70 is removed and the hydraulic cylinder 46 is actuated to extend its piston rod 52.

In addition, a grating 44 made up of a plurality of arcuate members is fixed to the inside of the lid 42, and this together with the effect of slowing down the flow due to the increase in the diameter of the dust eliminator cylinder, prevents the passage of large obstacles, long objects, etc. Obstruct and capture.

Referring again to FIG. 1, to explain the operation of the dredged soil suction pipe obstruction removal device of the present invention, the dust eliminator 14a is currently stopped and the dust eliminator 14b is activated. Then, the hydraulic gate valves 20a or 20b and 16b, 18b are open, while the hydraulic gate valves 16a, 18a are closed. In this state, the mixed fluid of earth and water sucked by the sand pump 12 is transferred from the inlet of the suction pipe to the hydraulic gate valve 20a.
or enters the branch pipe 10b through the dust eliminator 1 through the hydraulic gate valve 16b.
4b, and reaches the sand pump 12 through the hydraulic gate valve 18b and is pumped from there.

During the operation of the dust eliminator 14b, the dust eliminator 14a is opened, the obstruction is ejected into the dust hopper 30, and after the lid is closed, the dust eliminator 14a is connected to the water supply pipe 24, the hydraulic butterfly valve 28a, and the branch pipe 2.
Its interior is filled with water supplied via 6a and is ready for the next operation.

In this state, the dust eliminator 14b
When the differential pressure switch 22b senses the differential pressure caused by the obstruction, the hydraulic gate valves 16a and 18a are opened, and the branch pipe 10a is opened, allowing the mixed fluid to flow through the dust eliminator 14a. . After a predetermined period of time has elapsed, the hydraulic gate valves 16b and 18b on the side of the dust eliminator 14b are closed, the lid of the dust eliminator 14b is opened, and obstacles are removed and the inside is cleaned. At this time, the hydraulic butterfly valve 28b is open, while the hydraulic butterfly valve 28a is closed.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the grating is completely separated from the cylindrical body, so the grating does not block the removal of obstacles, and since the grating is an arcuate bar, it Obstacles can be removed more efficiently compared to conventional dust eliminators, and since the grating is an arc-shaped bar centered on the pivot pin, the lid of the dust eliminator can be smoothly removed from the cylindrical body without getting caught on obstacles. This provides a unique effect that can be brought out in a variety of ways.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the configuration of a dredged sediment suction pipe obstruction removal device of the present invention, and FIG. 2 is a front view of a dust eliminator used in the dredged sediment suction pipe obstruction removal device. 10... Suction pipe, 10a, 10b... Branch pipe,
12...Sand pump, 14a, 14b...Dust eliminator, 40...Main body, 42...Lid, 4
6... Hydraulic cylinder.

Claims (1)

[Claims] 1. A suction pipe having two branch pipes, a sand pump that is installed downstream of the suction pipe and sucks and pumps a mixed fluid of earth and sand through the suction pipe, and each branch pipe. Each dust eliminator has a cylindrical body and a cylindrical body that is attached to the side of the cylindrical body so as to be openable and closable via a pivot pin that is attached to the outer circumference of the cylindrical body. a semicircular lid, and a grating that is attached to the inside of the lid and is made up of a plurality of arc-shaped bars centered on the pivot pin;
A dredging soil suction pipe obstruction removal device characterized by having: 2. The dredged soil suction pipe obstruction removal device according to claim 1, wherein the lid is driven by a hydraulic cylinder. 3. The dredged soil suction pipe obstruction removal device according to claim 1, wherein each dust eliminator is provided with a differential pressure switch for detecting clogging inside the dust eliminator due to an obstruction. 4. The dredged soil suction pipe obstruction removal device according to claim 1, wherein a hydraulic gate valve is provided before and after each dust eliminator to cut off communication with the suction pipe.