JPH11173084A - Discharge controller for excavated soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge controller for excavated soil which sufficiently enhances the conveying efficiency of discharge mud by forming plug, and particularly optimize discharging of mud. SOLUTION: The discharge controller for excavated soil is provided with a mud-discharge pipe 14, a receiver tank 22, a mud-discharge unit 26, a mud- discharge valve 16 equipped at the front end of the mud-discharge pipe 14, an air introduction valve 20 equipped at the downstream side from the mud- discharge valve 16, and a flowmeter 32. The output of the flowmeter 32 is input to set a control object function to be led from the output, and the opening/ closing time of the mud-discharge valve 16 and the air introduction valve 20 is obtained so as to minimize the control object function, and these valves are alternately opened or closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the transport of excavated earth and sand in, for example, a method of excavating soil and the like, and more particularly to optimization of the removal of excavated earth and sand.

[0002]

2. Description of the Related Art Conventional methods for carrying out this kind of excavated earth and sand are disclosed, for example, in Japanese Patent Publication No. 7-15174 and Japanese Patent Publication No.
Japanese Patent Application Laid-Open Nos. -100076, 6-193383, 58-101998, and the like.

(1) In the dredging method disclosed in Japanese Patent Publication No. 7-15174, air is drawn from the tip of the suction hose to the suction machine through the earth and sand tank by suction of the suction machine, and is assisted into the hose from the middle of the suction hose. While introducing air, the opening of the tip of the suction hose was positioned at the boundary between the object to be dredged and the air located above it, and the object to be dredged was sucked in from the tip of the suction hose together with the air and passed through the suction hose. Dredged material is settled and collected in a sediment tank.

(2) In the method of discharging excavated earth and sand disclosed in Japanese Patent Publication No. Hei 6-100076, a suction hose is installed in a propulsion pipe, and the tip of the suction hose is opened by the end of the propulsion pipe. The tail end is connected to the suction machine through the earth and sand tank, and the suction of the suction machine causes the suction hose to absorb the air in the propulsion pipe from the opening at the tip and create an airflow to flow to the suction machine. With the tip opening of the suction hose facing the excavated earth and sand, the earth and sand is placed on the above-mentioned air flow and the starting shaft is moved to the side, and air is supplementarily introduced into the suction hose from the air inlet provided in the middle of the suction hose. The sediment is introduced to help move the sediment, and the moved sediment is settled and collected in a sediment tank provided in front of the suction machine.

(3) In the method for transferring sludge disclosed in JP-A-6-193383, a compressed air generator, a vacuum generator, and a tank for collecting sludge are disposed on the ground, and a sludge pipe is provided in the tank. A pressurized air supply pipe is connected and connected through a first valve in the vicinity of the tip of the mud feeding pipe, and is provided between the communication connection portion and the tip of the pressurized air supply pipe. Using a sludge transfer device provided with a second valve, first arrange the tip of the mud pipe to face the accumulated sludge, then close the first valve and open the second valve Then, the vacuum generating device is operated to suck the deposited sludge together with the air into the mud feeding pipe, and after a lapse of a required time, that is, after filling the sludge pipe with the sludge, when the suction transfer by the vacuum generating device is reduced. The second valve The sludge accumulated in Okudoro pipe by opening the first valve as well as the chain is pumped by compressed air is transferred into the tank.

(4) In the long-distance propulsion method disclosed in Japanese Patent Application Laid-Open No. 58-101998, a propulsion pipe is fitted to the tip of an underground pipe, a sealing wall is provided on the propulsion pipe, and the sealing wall is provided on the sealing wall. A cutting face excavator is provided, a drilling chamber is formed between the face face and the sealing wall, and in a propulsion device that injects muddy water into the excavating chamber, high-concentration muddy water is injected into the excavating chamber, and the muddy water is injected into the excavating chamber. Mix the excavated earth and sand to make the muddy water into a high concentration state containing earth and sand, and further fill the above liquid material into the space between the underground pipe and the ground surface through a through hole drilled in the outer pipe of the drilling room doing.

[0007]

Problems to be Solved by the Invention (1) Tokuho 7-15
In the dredging method disclosed in Japanese Patent Publication No. 174, it is necessary to position the tip of the suction hose at the boundary between the mud (dredged material) and the air. Need to be controlled. In addition, the introduction of air can be adjusted, but the suction of sludge cannot be adjusted, so that the transport state becomes unstable and a state close to blockage may frequently occur.
Therefore, the transport efficiency of the sludge cannot be sufficiently increased.

(2) In the method for discharging excavated earth and sand disclosed in Japanese Patent Publication No. Hei 6-100076, a suction hose is directed toward the opening of earth and sand (discharged sludge), and the end of the suction hose is capable of sucking sediment (discharged sludge). However, it is necessary to control the tip of the drainage pipe or the drainage at such a position. In addition, as in the case of Japanese Patent Publication No. 7-15174, the introduction of air can be adjusted, but the suction of the sludge cannot be adjusted, so that a state close to blockage may frequently occur. Can't raise enough.

(3) In the method of transferring sludge disclosed in JP-A-6-193383, it is necessary to arrange the end of the sludge feeding pipe so as to face the sludge. For this reason, it is necessary to control the end of the sludge pipe or the sludge in such a position, and there is a possibility that the efficiency of sludge transport cannot be sufficiently increased.

(4) In the long-distance propulsion method disclosed in Japanese Patent Application Laid-Open No. 58-101998, a check valve is used as a mud discharge valve, but the air to be sucked is the air (almost atmospheric pressure) in the propulsion pipe. In this case, the inflow of sludge does not stop even if the air valve is opened, unless the sludge tank and the air introduction position are separated sufficiently.
The plug cannot be formed sufficiently. That is, there is a thing far from the viewpoint of optimization of the discharge of the sludge.

The present invention has been made in order to solve such a problem, and it is possible to form a plug to sufficiently improve the efficiency of transporting sludge, and in particular, to optimize the discharge of sludge. It is an object of the present invention to provide a control device for unloading excavated earth and sand that has been made possible.

[0012]

According to a first aspect of the present invention, there is provided an apparatus for controlling the discharge of excavated earth and sand, the one end of which is connected to a sludge discharge tank,
A sludge pipe having the other end connected to the receiver tank, a vacuum pump connected to the receiver tank via an intake pipe, for vacuum suction of the inside of the sludge pipe, and one end side of the sludge pipe And a valve for air introduction provided through an air introduction pipe at a position on the downstream side of the sludge valve of the exhaust pipe, and a valve provided for the exhaust pipe. A flowmeter for measuring the flow rate of sludge, and the output of the flowmeter, input and set a control target function derived from the output, the sludge discharge valve and the valve so as to minimize the control target function Control means for determining the opening and closing time of the air introduction valve and alternately opening and closing those valves.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a configuration of an excavated earth and sand unloading control apparatus and related equipment according to an embodiment of the present invention. In the figure, the sludge excavated by the excavator 10 is stored in a sludge tank 12. The tip of a sludge pipe 14 is connected to the sludge tank 12. A mud discharge valve 16 is inserted into the end of the mud discharge pipe 14. Further, an air introduction valve 20 is connected to the downstream side through an air introduction pipe 18. A receiver tank 22 is connected to a rear end of the drainage pipe 14. A mud discharging unit (vacuum pump) 26 is connected to the receiver tank 22 via an intake pipe 24, and a sediment tank 28 is disposed below the receiver tank 22. In addition, the sludge pipe 14 is equipped with a flow meter 32 and a hold-up sensor 34,
2 measures the sludge flow rate, and the hold-up sensor 34 measures the level of the sludge in the sludge pipe 14.

In the excavated earth and sand discharging apparatus shown in FIG. 1, the tip of the sludge pipe 14 is always buried in the sludge of the sludge tank 12, and the sludge unit (vacuum) The pump 26 operates constantly, and vacuum suction is performed continuously. However, when a batch-type receiver tank is used, the vacuum is broken only for a short period of time while the mud in the receiver tank 22 is discharged to the earth and sand tank 28, and as a result, the vacuum suction is interrupted. The diameter of the air introduction pipe 18 is substantially the same as the diameter of the exhaust pipe 14.
Specifically, the exhaust pipe 14 is set to 125A and the air introduction pipe is set to 100A. The reason for using 100A is to avoid upsizing of the valve and the like. The air to be inhaled can be both atmospheric (or local pressure) or pressurized air,
Here, the atmospheric pressure is used.

FIG. 2 shows a control device of the mud discharging valve 16 and the air introducing valve 20 shown in FIG. As shown in the figure, the personal computer 50 inputs the outputs of the flow meter 32 and the hold-up sensor 34, performs an arithmetic process described later, controls the driving of the drive circuits 52 and 54 based on the results, and The opening and closing of the air valve 16 and the air introduction valve 20 are alternately controlled.

Next, the operation of the excavated earth and sand unloading device shown in FIG. 1 will be described. The excavated earth and sand discharge device of FIG. 1 reduces the pressure loss by reducing the contact area between a mud pipe and a fluid. In other words, by injecting air into a plug shape as compared with the case where the pipe is filled with fluid, the contact area is reduced and the pressure loss is reduced. (However, if the flow rate of the sludge is the same, the flow rate is reduced by the amount of air injected.)

The excavated earth and sand carry-out control device of FIG. 1 operates as follows. (1) The personal computer 50 includes drive circuits 52 and 5
4, a control command is issued, the mud discharging valve 16 is opened, the air introducing valve 20 is closed, and the mud in the mud discharging tank 12 is sucked into the mud discharging pipe 14. (2) Next, at a certain timing, the sludge discharge valve 16 is closed, the air introduction valve 20 is opened, and air is introduced into the sludge discharge pipe 14 to divide the sludge and the plug 60 is formed. This plug 60 flows downstream by vacuum suction. The method of determining this timing will be described later. (3) Next, at a certain timing, the process returns to the process (1), and the same procedure is repeated. The method for determining this timing will also be described later.

The plug 60 is formed and carried out by repeating the opening and closing control of the sludge discharging valve 16 and the air introducing valve 20 as described above.

Next, a detailed description will be given of a method of controlling the opening / closing (determination of timing) of the above-mentioned mud discharging valve 16 and air introducing valve 20.

The personal computer 50 includes a flow meter 3
2 is sampled and taken at a certain time interval (Δt), and an integrated value of the sampled measurement value (F _i ) of the flow meter 32 in a certain span (n) is obtained.
Then, after the unit conversion, a target amount of sludge (Q ₀ : calculated from, for example, the propulsion speed of the excavator 10) is added, and the control objective function (f) is set as in the following equation. Here, the operation variables are: mud discharging valve open time = air introduction valve closing time (x ₁ ), and mud discharging valve closing time = air introduction valve opening time (x ₂ = T−x _{1, where} T is the operation cycle. ).

[0021]

(Equation 1)

[0022] Incidentally, the constraint condition of the control, measures the level H of the hold-up sensors 34 when the plug 60 is not passed is equal to or smaller than the set value H _c (from the viewpoint of preventing clogging of Haidorokan), and That is, the opening / closing times x ₁ and x ₂ are positive. H ≦ H _c x ₁ , x ₂ > 0

The personal computer 50 obtains the opening and closing times x ₁ and x ₂ so as to minimize the control objective function, and performs the control in real time. At this time, a method for controlling the control objective function to a minimum is not limited. For example, the following method is applied. the amount of operation of the k-th x ₁ Δ
to set the x ₁ as shown in the following equation.

[0024]

(Equation 2)

[0025]

As described above, according to the present invention, a sludge discharge valve and an air introduction valve are measured so that a control target function derived from the flow rate is measured, and the control target function is minimized. Since the opening and closing time of the valve is determined and the valves are alternately opened and closed, an excellent effect is obtained in that the plug is appropriately generated and the transport efficiency of the wastewater can be sufficiently increased. I have.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an excavated earth and sand unloading device and related equipment according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control device of a mud discharging valve and an air introducing valve of FIG. 1;

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Ida 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Kazuo Koda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun (72) Inventor Yuji Ichioka 88, Ono-cho, Tsurumi-ku, Yokohama, Japan Kanagawa Prefecture Inside (72) Inventor Jun Matsuo 88, Ono-cho, Tsurumi-ku, Yokohama, Kanagawa Prefecture Japan Steel Pipe Co., Ltd. Inside

Claims (1)

[Claims] 1. An exhaust pipe connected at one end to a sludge tank, the other end connected to a receiver tank, and an intake pipe connected to the receiver tank. A vacuum pump for performing vacuum suction, a mud discharging valve provided at one end of the mud discharging pipe, and an air introducing pipe at a position downstream of the mud discharging valve of the mud discharging pipe. Provided air introduction valve, provided in the exhaust pipe, a flow meter for measuring the exhaust flow rate, input the output of the flow meter, set a control target function derived from the output, Control means for determining the opening / closing time of the mud discharge valve and the air introduction valve so as to minimize the control target function and alternately opening and closing the valves. Unloading control device.