JPH01312126A - Method for transporting dredged slurry - Google Patents

Abstract

PURPOSE:To improve transport efficiency and to contrive reduction of energy consumption by transporting dredged slurry to the surface of the water by propulsion produced by exhaust gas of a power source installed on a barge or heated-air gained through heat exchange with such exhaust gas. CONSTITUTION:Exhaust gas produced by a power source 11 installed on a barge 1 or heated-air gained by heat exchange with such exhaust gas is led to an excavator 2, excavating the ground 4 at the bottom of the water, through an exhaust gas supply pipe 12. The exhaust gas or the heated-air and high pressure water supplied by a high pressure water supply equipment 9 through a water pipe 7 are ejected upward in a jet stream form into a transport pipe 5, and excavated earth and sand can be transported upward by propulsion produced by the jet stream.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in methods for transporting dredged slurry.

(Prior Art) Conventionally, in order to transport dredged slurry, a transport pipe is generally attached to an excavator extended from a barge to the underwater ground, a dredging pump is interposed in the transport pipe, and the dredging pump is operated. A method of suctioning using suction power was used. However, this method of utilizing the suction power of a dredging pump has the problem that when the dredging depth becomes large, the suction power becomes insufficient and the transport efficiency is significantly reduced.

Therefore, development of transportation methods using other pump devices in place of or in combination with the dredging pump is being developed. For example, a method in which an ejector is attached to the tip of a transport pipe and water or air is injected as a jet stream from this ejector into the transport pipe (Japan Work Boat Association "Work Boat")
, No. 91, January 1970, P32), a method using an ejector that mixes air with the water jet flow (Japanese Patent Application Laid-Open No. 1820-1982), or a method using an air lifter in place of the ejector ( Japan Work Boat Association
Work boat J, 1st ship. According to these methods, the fluid itself generates a propulsive force to transport the dredged slurry, making it possible to improve transport efficiency compared to the case where only the dredging pump is used.

(Problem to be Solved by the Invention) By the way, it is known that the efficiency of the ejector and air lifter described above depends on the temperature of the fluid, especially the air, and that the higher the temperature, the better the efficiency (for example, Corona ” ,
(See Part Watanabe, p. 228). However, in the conventional transportation of dredged slurry, no consideration was given to the temperature of the air supplied to the ejector or air lifter, and there was a problem in that the transportation efficiency was not improved as much as expected.

The present invention has been made in view of the above background, and the present invention has been made in view of the above-mentioned background. The present invention aims to provide a method for transporting dredged slurry that further improves transport efficiency by effectively utilizing exhaust gas from the power source.

(Means for Solving the Problems) The configuration of the present invention for achieving the second object is to provide a system in which all or part of the fluid that generates propulsive force and transports the dredged slurry onto the water is installed on a barge. The present invention is characterized in that the exhaust gas is replaced by the exhaust gas of the power source or the heated air that has been heat exchanged with the exhaust gas.

In the present invention, the type of fluid is not particularly limited, and may be a water jet flow or an air jet flow supplied from an ejector, or air supplied from an air lifter.

Further, in the present invention, when the above fluid is directly replaced with exhaust gas, a collection device is provided in the exhaust gas supply path to remove harmful components such as Now and Sa2,
Alternatively, it is desirable to install a silencer in the same route to muffle exhaust gas noise.

(Function) In the dredging slurry transportation method configured as described above, by replacing all or part of the fluid with exhaust gas or heated air that has exchanged heat with exhaust gas, the dredging slurry transportation method has a large Propulsive force begins to be generated.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIGS. 1 and 2 show a system configuration for carrying out the method of the present invention. In these figures, 1 is a dredging barge, and on the dredging barge 1 there is a heavy I that holds an excavator 2.
A3 is installed. The excavator 2 has a cutter 2a at its tip, and by extending the cutter 28 to the underwater ground 4, it can excavate the underwater ground 4 to a predetermined range. A transport pipe 5 is attached to the excavator 2 with its tip opening facing the vicinity of the cutter 2a.

This transport pipe 5 is extended to the rear of the barge 1 via a guide rod attached to the upper end of the excavator 2.

Further, a bent portion 5a is formed on the distal end side of the transport pipe 5,
One end of a water pipe 7 is connected to this bent portion 5a via a nozzle 8 (FIG. 2). The other end of the water pipe 7 is connected to a high-pressure water supply device 9 installed on the barge 1.
The high pressure water pumped through the nozzle 8 is injected into the transport pipe 5 as a jet stream 10.

The nozzle 8 is opened upward at the bent portion 5a, and the jet stream 10 heads in the L direction to generate a propulsive force to transport the dredged slurry onto the barge 1. An exhaust gas supply pipe 12 extending from an exhaust port 11a of a power source (diesel engine) 11 installed on the barge 1 is connected to the nozzle 8, and the jet stream lO injected from the nozzle 8 is is designed to be mixed with high-temperature exhaust gas.

With the above system configuration, from the high pressure water supply device 9 to the water pipe 7
The high-pressure water that is forced into the nozzle 8 is injected upward from the nozzle 8 into the transport pipe 5 as a jet stream 10, and the thrust generated by this jet stream 10 causes the earth and sand excavated by the excavator 2 to move upward. transported to. At this time, the power source 1 is passed through the exhaust gas supply pipe 12 to the nozzle 8.
1 supplies high temperature exhaust gas, and the exhaust gas is mixed into the jet stream 10. This mixture of high-temperature exhaust gas amplifies the pressure of the jet stream 10, generates a larger propulsive force, and significantly improves the transport efficiency of earth and sand.

(Effects of the Invention) As described in detail below, the method for transporting dredged slurry according to the present invention uses a platform to transport all or part of the fluid that generates propulsive force and transports the dredged slurry onto the water. Since the exhaust gas from the power source installed on the ship or the heated air heat-exchanged with the exhaust gas is used to replace the exhaust gas, a large propulsive force is generated and the transportation efficiency is improved. Further, by using exhaust gas, special means for heating can be made unnecessary, and an advantageous effect can be obtained in terms of energy saving.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a system configuration for carrying out the dredged slurry transportation method of the present invention, and FIG. 2 is a cross-sectional view showing a part thereof in an enlarged manner. 1 ... Barge 2 ... Excavator 4 ... Underwater ground 5 ... Transport pipe 7 ... Wood pipe 11 ... Power source 12 ... Exhaust gas supply pipe patent applicant Ministry of Transport Port Technology Research Institute Director 1) Hajime Toyo Construction Co., Ltd.

Claims (2)

[Claims] (1) A method in which a transport pipe is attached to an excavator extended from a barge to the underwater ground, fluid is supplied to the tip of the transport pipe, and the dredged slurry is transported onto the water by the propulsive force of the fluid. A dredging slurry transportation method characterized by replacing all or part of the fluid with exhaust gas from a power source installed on a barge. (2) A method in which a transport pipe is attached to an excavator extended from a barge to the underwater ground, fluid is supplied to the tip of the transport pipe, and the dredged slurry is transported onto the water by the propulsive force of the fluid. A method for transporting dredging slurry characterized by replacing all or part of the fluid with heated air that exchanges heat with exhaust gas from a power source installed on a barge.