JPH0633014Y2 - Long-distance transport equipment for soft mud, etc. - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a transportation device for mud, etc.
The present invention relates to a long-distance transportation device for soft mud collected from the bottom of a lake.

[Prior Art] Conventionally, a dredging device that collects mud, sludge, dust, etc. (hereinafter simply referred to as "mud etc.") on the bottom of water such as the seabed and lake bottom has minimized the amount of water collected during mud collection. Therefore, it is desired to collect soft mud having a low water content. this is,
The water separated from the mud with a large water content flows out of the mud dump and pollutes the river and the sea, so a vast treatment plant is needed to prevent this, and the water is separated and discharged over a long period of time. It is necessary to do so.

For this reason, it is considered that compressed mud is blown into the mud collection container to collect soft mud having a low water content ratio.

It is considered that a pressure-fed transport device discharges soft mud (dredging mud) with a low water content ratio collected in this way to a place with a long distance. When water is included, it can be fluidized together with water and can be transported relatively smoothly, but soft mud having a low water content cannot be expected to be fluidized by water. Therefore,
It has been proposed to mix soft mud or the like having a low water content with water to form a slurry, which is then pressure-fed by a high-pressure pump such as a slurry pump using a tubular body.

However, when mud with a large water content or slurried soft mud is transported, it is necessary to separate the discharged mud, soft mud, etc. from water, so a large treatment facility such as a sedimentation tank is formed at the discharge location. The same problem as described above also occurs in the treatment of separated water, and even if dredging mud with a small water content ratio is collected, it should be slurried when it is transported and the water content should be as much as possible during the above-mentioned mud collection. There is a problem that the meaning of the dredging device that reduces the sampling amount of the is lost.

For long-distance transportation by pressure, it is necessary to provide a relay station and a high-pressure pump or the like at this relay station. Forming a high-pressure pump or the like at the relay station requires a great deal of cost and labor due to the weight of the pump or the like and the problem of installing the relay station.

Furthermore, in Japan, the use of high-pressure air (10 kg / cm ² or more) is subject to various restrictions by law.

For the reasons described above, generally relatively heavy less, statutory unlimited 7 kg / cm ² approximately of the air compressor is often used, with 7 kg / cm ² about an air compressor, the length of such ooze A device capable of distance transportation is desired.

[Problems to be solved by the invention] However, when an air compressor of about 7 kg / cm ² is used, one air compressor cannot carry a long distance of several kilometers due to pressure loss in the pipe.

For this reason, it is necessary to pressurize and accelerate soft mud and the like on the way.
However, if the air jet is simply put into the discharge pipe, the total flow rate of the air increases, and the air expands as the pressure decreases, so that the flow velocity of the air increases only. In particular, since the pressure loss is proportional to the square of the flow velocity of air, the effect of the air jet cannot be expected so much.

The present invention has been made in view of the above problems, and a long-distance transportation device in which air that has lost energy is discharged to the outside of a discharge pipe and only soft mud or the like is re-pressurized and accelerated to extend the transportation distance. To provide.

[Means for Solving Problems] A long-distance transport device for soft mud or the like according to the present invention transports collected soft mud or the like by a pressure feed pump of 10 kg / cm ² or less and a discharge pipe connected to the pressure feed pump. In the long-distance transportation device, a mud collector having a position before the transportation distance limit due to pressure loss as a relay point of the discharge pipe, and an adjustable exhaust pipe at the relay pipe of the discharge tube, and the mud collector, A pressurizing pump connected in series, forming an air introduction pipe for introducing high pressure air in the middle of the discharge pipe, removing high pressure air expanded in the discharge pipe and high pressure from the air introduction pipe It is characterized by introducing air. It is preferable that the soft mud or the like transported at this time is kept at a constant volume ratio with the compressed air.

[Operation] The present invention is configured as described above, and the operation of the present invention having the above configuration will be described based on a specific embodiment.

In FIG. 1, the bottom of the sea,
Soft mud with a small water content ratio collected from the bottom of the lake,
As it is, it is introduced into the discharge pipe, which is a tubular body, and is transported in the discharge pipe 2 by a pressure pump or the like (not shown). An end portion of the discharge pipe 2 having a predetermined length, that is, a position before the transport distance limit due to pressure loss is a relay point of the discharge pipe, and a mud collector 3 is formed at this relay point. Mud 3
The air in the discharge pipe 2 is discharged from the exhaust pipe 4 through the control valve 5. The pressure in the discharge pipe when exhausting differs depending on the type of soft mud or the like to be transported. Soft mud or the like is put into the pressurizing pump 7 from the lower end of the conical portion 3b of the mud collector 3 and is transported again in the discharge pipe 10 connected to this pressurizing pump, as in the initial state. Further, an air introduction pipe 11 for introducing high pressure air is formed in the middle of the discharge pipe 10, and the discharge pipe 10
The high-pressure air expanded in 1 is removed, and the high-pressure air is introduced from the air introduction pipe 11. With this configuration, it is possible to transport the desired distance.

Embodiment An embodiment according to the present invention will be described below with reference to the drawings.
However, as a matter of course, components, other members, arrangements, etc. described or illustrated in the following explanation examples are,
The present invention is not intended to limit the present invention, but is merely an example for explanation.

FIG. 1 is an embodiment of the present invention and is a schematic explanatory view showing a relay point. FIG. 2 is a graph showing the relationship between air pressure and transportation distance.

Reference numeral 1 denotes a relay point of the long-distance transportation device according to the present invention, and soft mud or the like (not shown) is transported from the arrow X line to the arrow Y direction. , A discharge pipe 2 having a diameter is used, and a mud collector 3 is formed at an end 2a of the discharge pipe 2 which is a relay point.

The mud collector 3 is a cyclone type having a cylindrical portion 3a and a conical portion 3b. The upper end of the cyclone-type mud collector 3 is connected to the discharge pipe 4 and is open to the atmosphere via a control valve 5 formed at the tip of the discharge pipe 4. The lower end of the conical portion 3b of the mud collector 3 is connected to the pressurizing pump 7 via the connecting pipe 6. The pressurizing pump 7 in this example is a screw pump, and a pump driving machine 8 which is a driving device thereof is connected by a transmission device 9 such as a belt or a chain. The pressurizing pump 7 is connected to the discharge pipe 10, and an air introduction pipe 11 for introducing high-pressure air is formed at a predetermined position on the discharge pipe 10. The air introduction pipe 11 is connected to an air compressor (not shown) via a valve 12.

At the position where the air introduction pipe 11 is formed, since the air expansion increases as the pressure decreases, it is preferable that transportation of soft mud or the like becomes difficult due to the pressure decrease. That is, by introducing the compressed air, the friction between the discharge pipe and the soft mud can be reduced and the transportation can be performed smoothly, but the friction increases on the contrary when the air amount is increased.
Therefore, when transported by a predetermined distance, air and soft mud are separated and accelerated again.

This will be explained based on a graph. For example, as shown in FIG. 2, since the pressure loss is proportional to the square of the flow velocity in the pipe, it is the transportation distance L3, and when the air jet is introduced without bleeding, the curve The air pressure in the exhaust pipe as shown by A only becomes the state as shown by the curve B,
The transport distance is only increased by the distance L3 by the distance L3.

Here, air and soft mud etc. are separated and the expanded air is discharged,
If a new air jet is introduced and re-accelerated, the transportation distance of the distance L2 is further extended. Therefore, the distance L
3, a relay point 1 is formed at a position of a distance L1 which is slightly before, and a mud collector 3 and a pump 7 are formed at the relay point 1 to discharge the air in the expanded discharge pipe 2, A simple air jet.

When transporting a desired distance in this way, a relay point or a predetermined distance (that is, a point where the pipe internal pressure decreases) or
It suffices to form an introduction pipe for introducing the air jet.

Also, by keeping the volume ratio of air and soft mud within a certain limit, smooth transportation can be achieved.

In the above embodiment, a screw pump type pressurizing pump is used at each relay point, but any pump such as a piston pump or a jet pump may be used.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

The present invention discharges air that has lost energy during the transportation of soft mud or the like by compressed air to the outside of the discharge pipe and accelerates re-pressurization of the soft mud or the like, so that the desired distance can be transported. In particular, even when using a pressure pump of 10 kg / cm ² or less, long-distance transportation can be effectively performed.

Moreover, by using the transportation device of the present invention,
It is possible to transport, for a long time, a material having a small water content ratio, which is sampled by dredging, without being slurried as it is. Therefore, it is not necessary to provide a treatment facility for separating water such as soft mud.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention and is a schematic explanatory view showing a relay portion, and FIG. 2 is a graph showing a relationship between air pressure and transportation distance. 1 ... Relay point, 2, 10 ... Discharge pipe, 3 ... Mud collector, 4 ... Exhaust pipe, 7 ... Pressurizing pump, 8 ... Drive device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Minoru Asada 6-9, Abidaji-cho, Shimonoseki City, Yamaguchi Prefecture, Shimonoseki Machinery and Equipment Office, 4th Port Construction Bureau, Ministry of Transport (72) Creator Masamitsu Tatsuguchi 2-chome, Hitotsubashi, Chiyoda-ku, Tokyo 3-1, Mitsui Marine Development Co., Ltd. (72) Inventor Yasukazu Tsusaka 2-3-1, Hitotsubashi, Chiyoda-ku, Tokyo Mitsui Marine Development Co., Ltd. (56) Reference JP-A-49-94079 (JP) , A)

Claims (2)

[Scope of utility model registration request] 1. A long-distance transportation device that transports the collected soft mud or the like by a pressure-feeding pump of 10 kg / cm ² or less and a discharge pipe connected to the pressure-feeding pump, and discharges a position before the transportation distance limit due to pressure loss. A mud collector having an adjustable exhaust pipe at a relay point of the discharge pipe and a pressure pump connected to the mud collector is formed to form a relay point of the discharge pipe. A long-distance transport device for soft mud or the like, characterized in that an air introduction pipe for introducing high pressure air is formed on the way, and high pressure air expanded by the discharge pipe is removed and high pressure air is introduced from the air introduction pipe. . 2. The long-distance transportation device for soft mud or the like according to claim 1, wherein the soft mud or the like to be transported is made to have a constant volume ratio to the compressed air.