JPH0835243A - Dredging method and transfer pipe structure of fluid wiht sand and stone - Google Patents

Abstract

PURPOSE:To suck soil and stones by utilizing atmospheric pressure and water pressure and transfer them, by ejecting jet water stream from the bottom face to make the soil and stones at the bottom suspend in the water and reducing the resistance in a pipe and the friction. CONSTITUTION:The opening of a vertical pipe 1 is made to vertically slide and positioned close to soil and stones 3 to suck them and pump up. In this case, the vertical suction pipe 1 is bent horizontally at the lower position than the critical point for suction of soil and stones 3 and in the lower part thereof, a valve of a collecting tank 2 of soil and stones is provided at the closed state. A fluid with a higher specific gravity containing soil and stones 3 is dropped on passing through a bend and only water continuously stored in the tank 2 is pumped up. Next, the valve is opened and the piled soil and stones are transferred to the upper side through another suction pipe 1'. The transfer pipe 4 is inclined and a jet water is elected from a water pipe 17. At the time, the inclined angle, the jet water pressure, and the water quantity are decided on the basis of conditions like kinds of soil and stones 3, the mixed ratio of water and soil and stones. In this way, soil and stones can be efficiently transferred by a small buoyant force.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is for dredging dams and other sediment, cheeks, stones, etc. (hereinafter referred to as debris) deposited on the bottom of a water
The present invention relates to a method of transporting these to a remote place and a structure of a transport pipe.

[0002]

2. Description of the Related Art As a conventional dredging method, a water flow or air pressure is created mainly by a powerful pump for the debris on the bottom of the water,
Alternatively, a bucket, a grab boat, or the like was used to apply a large amount of energy to move it upward to dredge it. In addition, as a means for transporting dredged debris to remote areas, there is a method of transporting by truck or a method of pipe transportation in the form of a cable or slurry, and there are various means and methods for easily dredging and transporting a large amount of debris. It is being actively researched, but the fact is that there is no efficient configuration and method in each case.

Therefore, the delay of the dredging work continues to increase the amount of debris accumulated on the bottom of the water, and dams, lakes, and harbors are losing their original functions, which is a serious problem.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to dredge a large amount of debris with a small amount of energy and a simple method, and to easily transport the dredged debris.

[0005]

[Means for Determining the Problem] This problem is mainly solved by the structure utilizing the siphon phenomenon due to atmospheric pressure and water pressure and the structure in which a fountain flow is applied from below to slurry-like debris flowing in a pipe or groove shape. To be done.

[0006]

[Operation] In such a structure, the atmospheric pressure and water pressure are mainly applied so that the debris is sucked together with water from the bottom of the lake as a siphon structure and is conveyed by continuous pipes, conveyors, etc. did.

[0007]

1 to 7 show an example of this dredging method and transportation structure. FIG. 1 is a conceptual diagram showing the dam dredging method and its structure. Figure 2 shows the structure of the vertical part of the suction pipe that dredges the debris from the deep lake bottom. The vertical pipe shows the method and the structure to move the debris upward stepwise from the deep lake bottom using only atmospheric pressure. A tank 2 for accumulating debris is provided at a position where a specific portion of 1 is bent in the lateral direction, and the debris 3 that has been sucked up is temporarily accumulated, and from this position, the atmospheric pressure is used again to sequentially move upward. In FIG. 3, appropriate holes 5 are opened in a plurality of rows at the bottom of the carrier pipe 4, and a jet water flow 8 is jetted at an arbitrary angle by the water level difference H of the pump 6 or the high position tank 7 from these holes to make the debris 3 submerged. It is floated in the air and moved by causing a vortex. At this time, the water source draws water from the upper surface of the carrier pipe 4 so that the amount of water in the carrier pipe 4 is always constant and the water speed is stabilized. FIG. 4 shows an example of a dredging method for the sea / lake bottom. A ship tank 9 that can be moved up and down by a float 21 is provided on the water to create a water pressure difference, and debris is collected in the tank by a suction pipe 1 and collected by a sieve 15. Separated from water, only the debris 3 is conveyed by the conveyor 10, and the water is returned to the water by the drain pipe 11.
Further, FIG. 5 is a schematic plan view when five suction tubes are used in the same structure and shows an example of a method for enabling a large amount of dredging at one time. FIG. 6 shows a structure in which a water supply pipe is superposed on the bottom of the transfer pipe.
FIG. 7 shows a structure in which a water pipe is stacked on the bottom of a U-shaped carrier pipe.

The opening of the vertical pipe 1 shown in FIG. 2 is used as a pipe 13 which slides up and down, and is brought close to debris and is sucked and conveyed upward. In the method of using atmospheric pressure, the height at which debris can be sucked is about 5.5 m due to the specific gravity, so at the position below this suction branch point, bend the vertical suction pipe horizontally, and debris below it. It is made with the valve 14 of the tank 2 for accumulating foods closed. According to this method, fluid debris having a large specific gravity falls when it passes through the curved portion, so that it is continuously accumulated in the tank and only water flows upward.

Next, the valve 14 of the tank is opened, and the accumulated debris is sequentially moved upward by a siphon using another suction pipe 1 '. As a result, dredging at a deep position was made possible by a method using only atmospheric pressure.

Further, the suction pipes 1, 1'can be simplified by using bypass 15 pipes as shown by dotted lines. At this time, a valve 20 for switching the water flow is provided at an appropriate position of the suction pipes 1, 1 '.

The horizontal conveying pipe 4 in FIG. 3 is inclined, and jet water 8 is jetted from the parallel water pipes 17. The inclination angle and the jet water pressure / water amount 8 at this time are determined by the conditions such as the type of debris 3 and the mixing ratio of water and debris. Since the directionality is determined, it is characterized by a structure that can be efficiently moved by giving a small buoyancy.

In the method of jetting the jet water 8 from the parallel water pipes 17, the debris in the pipes are floated and dispersed to make the flow uniform and reduce the resistance in the pipes. It is possible to prevent clogging of various kinds of pipes, reduce wear of the pipes, and reduce defects in transportation by the pipes.

The angle at which the jet water flow 8 is jetted is set in the conveying direction, and energy is applied to the floating of debris and the flow of water. This water source is attached to the upper surface of the carrier pipe 4 by the filter 1
8 is added and water is introduced into the tank 7 and used. Also,
A pump 6 is provided on the parallel water supply pipes 17 to eject high-pressure water from the bottom of the transfer pipe 4, but the total amount of water in the transfer pipe can be kept constant and the speed of the water flow can be averaged in order to keep the suction amount and discharge amount the same. it can.

FIG. 4 shows a method of dredging in a place where there is no drop in the surroundings such as the sea and lake water. A large-scale dredging is carried out at a time by using water pressure for suction force to move vertically up and down. The water pressure generated is used to determine the depth by operating the float 21. A suction pipe for debris is drawn out from the bottom of this tank, and it is dredged. It is introduced into the tank and the dredged debris and water are separated by a sieve 15. Only the debris is carried upward by the conveyor 10 and the water is pumped by the pump 16. Drain to.

FIG. 5 shows a plan view in which five dredging pipes are provided for one conveyor having a large carrying capacity in the tank 9 having the above-mentioned structure, and a method of enabling a large amount of dredging by utilizing water pressure is shown. In addition, the dredging pipe can be arbitrarily increased or decreased as needed, and the structure is simple, and the dredging method has good power efficiency.

By deeply submerging the vessel 9, a high water pressure can be obtained, the suction force of the dredging can be set arbitrarily, and the suction pipe can be made relatively short, so that the internal resistance of the pipe is small, and
Since the pipe diameter can be set large, dredging of large stones is also possible. In addition, as an advantage of separating the debris in the tank, the conveyer capacity of the conveyer can be freely set to enable a large amount of treatment, and the separated water alone can be easily discharged.

Examples will be shown below. (Example 1) When debris was sucked up by a siphon using atmospheric pressure, it was confirmed that the debris rises up to about 5.5 m in the siphon pipe, but only water flows beyond that. This is almost in agreement with the calculated value of the average specific gravity of earth and stones of about 1.6 g. Therefore,

The position of the debris accumulation tank 2 provided on the suction pipe shown in (5) is 5.5 m or less, and this method is continued to enable dredging from a deep water bottom using only atmospheric pressure (water pressure).

(Embodiment 2) Length 2 of the conveying pipe in the horizontal direction
5 m, the height of the head and the end is 1.5 m, this gradient is about 3 °, the diameter of the carrier pipe is 38 mm, and the jet port 5 mm has a water pressure (approx. 1.4 atm of jet water flow at an angle of 90 degrees, At this time, the mixing ratio of water and debris was about 30%, and the size of debris was a natural shape of 1 to 17 mm, but even if the gradient was slight, it flowed uniformly by the jet water from below.

(Embodiment 3) The mixing ratio of stones can be increased by increasing the jet water pressure and tilting the jetting angle to be given, though the pipe resistance varies depending on the mixing ratio of water and debris and the shape.

(Embodiment 4) In the above construction, the carrier pipe is used, but depending on the installation conditions, it may be a semi-circular or U-shaped carrier pipe and the jet flow may be given from below. In this case, the construction is easy and the construction cost, Easy maintenance. Further, it can be combined with a pipe carrying pipe as required.

[0021]

As described above, according to the method and structure of the present invention, dredging at a deep position can be carried out by utilizing atmospheric pressure and water pressure, and debris can be removed by a jet flow given from under the carrier pipe. Since it conveys while floating, it eliminates wear and clogging of the pipe, greatly improving maintenance and energy saving,
By using the method with this configuration, it is possible to facilitate dredging of dams, lake bottoms, harbors, etc., and especially to contribute to dredging inside dams that are being buried.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a dam dredging method of the present invention.

FIG. 2 is a schematic cross-sectional view showing the structures of the suction pipe and the debris accumulation tank of the present invention.

FIG. 3 is a schematic sectional view showing a water pipe parallel to the horizontal carrier pipe of the present invention.

FIG. 4 is a conceptual diagram showing an application example of the present invention.

FIG. 5 of the present invention

FIG. 4 is a plan view showing a large-capacity dredging method in which five suction pipes suck up and carry on one conveyor in a concentrated manner in the application example shown in FIG.

FIG. 6 is a cross-sectional view in which the carrier pipe and the water supply pipe of the present invention are integrated.

FIG. 7 is a cross-sectional view in which the U-shaped carrier pipe and the water supply pipe of the present invention are integrated.

[Explanation of symbols]

 1 Suction Pipe 1'Suction Pipe 2 Debris Accumulation Tank 3 Debris 4 Conveying Pipe 5 Jetting Hole 6 Jet Pump 7 Water Storage Tank 8 Jet Water Flow 9 Tank 10 Conveyor 11 Drain Pipe 12 Buoyancy Tank 13 Slide Pipe 14 Valve 15 Sorting screen 16 Drain pump 17 Water pipe 18 Filter 19 Tank 20 Switching valve 21 Float 22 Weight

Claims (3)

[Claims] 1. A pipe for conveying debris or water by water or a groove-shaped pipe having a plurality of rows of holes formed in the bottom surface thereof, and a water pipe or a bottom pipe of a pipe provided with a pump in parallel with the pipe, and a double pipe at the bottom of the pipe. West,
The suction side of this water supply pipe is opened in the tank connected to the upper surface of the transfer pipe, and the discharge side is connected to the holes in multiple rows of the transfer pipe. This is a method of floating debris in water to reduce the resistance inside the pipe and transferring the debris fluid by a suction / discharge structure that keeps the total amount of water in the pipe constant. 2. A vertical suction pipe for sucking debris fluid from the bottom of the water is bent horizontally within a range where debris rises, and a sloped debris accumulation tank is provided below this suction pipe.
The tip of another suction pipe is opened inside this tank, and a valve for introducing and stopping the external water is installed in the tank. From this position, the siphon sucks upward again and moves the debris stepwise upward. A structure in which a suction tank is provided with an integrated tank. 3. A plurality of pipes for suctioning debris from the bottom of the tank by providing a tank for moving up and down by a flow of air in the deep tank of the ship to adjust the submersion depth to make a desired water pressure difference. It is a method of taking out, sucking debris into the ship, separating water and debris with a sieve, and transporting each to the outside with a pump and a conveyor.