JP3800424B2 - Excavation sediment transport control device - Google Patents

Description

  The present invention relates to an excavation sediment transport control device in, for example, a ground excavation method.

(1) In the conventional dredging method, air is sucked from the tip of the suction hose through the earth and sand tank to the suction machine by suction of the suction machine, and the suction hose while introducing air into the hose from the middle of the suction hose. The tip opening of the suction pipe is positioned at the boundary between the object to be dredged and the air located above it. (See, for example, Patent Document 1).

(2) In the conventional method for discharging excavated earth and sand, a suction hose is installed in the propulsion pipe, and the tip of the suction hose is opened with the tip of the propulsion pipe. After connecting to the suction machine, the suction pipe sucks the suction hose into the suction hose and absorbs the air in the propelling pipe from the tip opening, creating an air flow that flows to the suction machine. , Put the earth and sand on the above air flow and move the start shaft to the side, and also assist the movement of the earth and sand by introducing air into the suction hose from the air inlet provided in the middle of the suction hose, The moved earth and sand are settled and collected in an earth and sand tank provided in front of the suction machine (see, for example, Patent Document 2).

(3) In the conventional sludge transfer method, a compressed air generator, a vacuum generator, and a tank for collecting sludge are disposed on the ground, and a sludge pipe is connected to the tank. A pressurized air supply pipe is connected in communication near the tip of the pipe via a first valve, and a second valve is provided between the communication connecting portion of the pressurized air supply pipe and the tip. Using a sludge transfer device, first arrange the tip of the pipe to face the accumulated sludge, then close the first valve and open the second valve, and then operate the vacuum generator The sludge accumulated in this way is sucked together with air in the mud pipe, and after the required time has passed, that is, after the sludge is filled in the mud pipe, the second valve is closed when the suction transfer by the vacuum generator decreases. Open the first valve It is pumped by compressed air accumulated sludge in Okudoro pipe and are transferred to the tank (e.g., see Patent Document 3).

(4) In the conventional long-distance propulsion method, a propelling pipe is fitted to the tip of the underground buried pipe, a sealing wall is provided on the propelling pipe, a face excavating device is provided on the sealing wall, and the face and the face are sealed. In a propulsion device that forms an excavation chamber in the middle of the wall and injects mud into the excavation chamber, high-concentration mud is injected into the excavation chamber, and the mud is mixed with the earth and sand excavated inside the excavation chamber. In addition, the above-mentioned liquid material is filled in the space between the underground pipe and the natural ground surface through a through hole drilled in the outer pipe of the excavation chamber (see, for example, Patent Document 4). ).

Japanese Patent Publication No. 7-15174 Japanese Patent Publication No. 6-100076 JP-A-6-193383 JP 58-101998 A

  (1) In the dredging method of Patent Document 1, it is necessary to position the tip of the suction hose at the boundary between the mud (soot) and the air. For this reason, the tip of the suction hose (mud pipe) or the mud It is necessary to control the liquid level. Moreover, since the introduction of air can be adjusted, but the suction of the mud cannot be adjusted, the transportation state becomes unstable, and a state close to blockage may frequently occur. Therefore, it is not possible to sufficiently increase the transport efficiency of the waste mud.

(2) In the method of discharging excavated sediment of Patent Document 2, it is necessary to direct the suction hose toward the soil (drainage mud) with the tip opening directed and the tip of the suction hose must be located where the sediment (sudden fluid) can be sucked. Therefore, it is necessary to control the tip of the mud pipe or the mud at such a position. Further, as in the case of Patent Document 1, the introduction of air can be adjusted, but the suction of waste mud cannot be adjusted, so that a state close to blockage may frequently occur, and the transport efficiency of empty waste mud is sufficiently increased. I can't.

(3) In the sludge transfer method of patent document 3, it is necessary to arrange | position so that the front-end | tip of a mud pipe may face sludge. For this reason, it is necessary to control the tip of the mud pipe or the mud at such a position, and there is a possibility that the transport efficiency of the mud cannot be sufficiently increased.

(4) In the long-distance propulsion method disclosed in Patent Document 4, a check valve is used as a mud discharge valve. However, when the air to be sucked is air in the propulsion pipe (approximately atmospheric pressure), Unless the air introduction position is sufficiently separated, the inflow of waste mud does not stop even if the air valve is opened, and a sufficient plug cannot be formed. For this reason, the transport efficiency of waste mud cannot be raised sufficiently.

  The present invention has been made to solve such problems, and it is intended to provide an excavation earth and sand carrying-out control device capable of sufficiently increasing the efficiency of transporting mud by forming a plug. Objective.

The excavation sediment transport control device according to the present invention includes a mud pipe having one end connected to the mud tank and the other end connected to the receiver tank, and a receiver tank connected to the receiver tank via an intake pipe. A vacuum pump that vacuums the inside of the mud pipe and a valve provided on the mud tank side of the mud pipe via an air introduction pipe, and when the valve is opened, the exhaust from the mud tank to the mud pipe An air introduction valve provided at a position where mud inflow stops, an air flow meter provided upstream of the air introduction valve for measuring the air flow rate to the air introduction valve, and an air introduction valve And a valve control unit that opens and closes based on the conditions and discharges the mud as a plug, and closes the air introduction valve when the output of the air flow meter exceeds a predetermined upper limit value.

  In the present invention, the air introduction valve is opened / closed based on a predetermined condition to discharge the mud in a plug shape, and the output of the air flow meter provided upstream of the air introduction valve has a predetermined upper limit value. Since the air introduction valve is closed when it exceeds, the contact area between the sludge pipe and the fluid can be reduced, pressure loss can be reduced, and the transport efficiency of the sludge can be sufficiently increased. Therefore, the control mechanism can be further simplified.

Embodiment 1. FIG.
FIG. 1 is a diagram showing a configuration of excavated sediment transport control apparatus and related equipment according to Embodiment 1 of the present invention. In the figure, the mud excavated by the excavator 10 is stored in the mud tank 12. A tip of a mud (transport) pipe 14 is connected to the mud tank 12. A receiver tank 22 is connected to the rear end portion of the mud discharge pipe 14. A drainage unit (vacuum pump) 26 is connected to the receiver tank 22 via an intake pipe 24, and an earth and sand tank 28 is disposed below the receiver tank 22. In addition, the intake pipe 24 is equipped with a first air flow meter 32 that measures the amount of intake air in the intake pipe 24 and a pressure gauge 34 that measures the pressure in the intake pipe. However, only one of the first air flow meter 32 and the pressure gauge 34 may be provided.

  Further, on the downstream side of the mud tank 12, an air introduction valve 20 is provided in the mud pipe 14 via an air introduction pipe 18, and the position of the air introduction valve 20 is the air introduction valve 20. When the is opened, the inflow of the mud from the mud tank 12 to the mud pipe 14 stops naturally. For this purpose, in the case of FIG. 1, it is necessary to position the air introduction valve 20 at a position higher than the sludge liquid level in the sludge tank 12. It is good to position it above the upper surface of.

  In the excavation sediment transport control device of FIG. 1, it is assumed that the tip of the mud pipe 14 is connected to the outlet of the mud tank 12, and the mud unit (vacuum pump) 26 is always in operation and is vacuumed. Shall be 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 approximately the same as that of the mud pipe 14. Specifically, the mud pipe is 1.25 and the air introduction pipe is 1.0. The reason for this is to avoid an increase in the size of the valve or the like. The air to be sucked can be either atmospheric pressure (or in-situ pressure) or pressurized air, but atmospheric pressure is used here.

  FIG. 2 is a block diagram of a control device for the air introduction valve 20 of FIG. As shown in the figure, the personal computer 50 inputs the output of the first air flow meter 32 or the output of the pressure gauge 34, calculates the input to control the drive of the drive circuit 54, and controls the air introduction valve. The opening and closing of 20 are controlled alternately. Note that the control device shown in FIG. 2 is used in the same manner in the embodiments described later in order to control the opening and closing of the air introduction valve 20.

Next, the operation of the excavation sediment transport control device of FIG. 1 will be described.
(1) The personal computer 50 issues a control command to the drive circuit 54, closes the air introduction valve 20, and sucks and flows the mud in the mud tank 12 into the mud pipe 14.
(2) Next, the air introduction valve 20 is opened at a certain timing, and air is introduced into the mud pipe 14 to divide the mud and form a plug 60 to form a plug 60. The plug 60 flows downstream by vacuum suction. A method for determining this timing will be described later.
(3) Furthermore, at a certain timing, the process returns to the above (1) and the same procedure is repeated. This timing determination method will also be described later.

Next, an opening / closing control method for the air introduction valve 20 will be described. In the personal computer 50, an upper limit threshold value of the intake flow rate by the first air flow meter 32 or an upper limit threshold value of the pressure gauge 34 is set, and when the upper limit value is exceeded, the air introduction valve 20 is closed. Then, the mud from the mud tank 12 is discharged to the mud pipe 14.
Next, the plug is formed by opening the air introduction valve 20, and its volume is also determined by the timing. As a specific control method (control of the volume of the plug), for example, a lower limit threshold value is provided in the first air flow meter 32 or a lower limit threshold value in the pressure gauge 34, and an air introduction valve is used when the value falls below this set value. And a method of opening the air introduction valve 20 after a predetermined time has elapsed after the air introduction valve 20 is closed.

  When the earth and sand are being transported in the mud pipe 14, the pressure or the intake air amount of the intake pipe 24 gradually decreases as it is carried in the suction direction from the time when the earth and sand is filled at the tip, and the receiver tank 22 It will recover when it reaches. If the earth and sand are transported one after another without performing control without recovering, the capacity of the mud discharge unit (vacuum pump) 26 is exceeded and the mud pipe 14 is blocked. Therefore, an upper limit value is set for the pressure or the intake amount of the intake pipe 24, recovery of the intake capacity is identified by this upper limit value, and if each measured value exceeds this upper limit value, the air introduction valve 20 is closed, Transport.

  If these upper limit values are set low, a transport method in which a plurality of plugs exist in the sludge pipe can be realized, and if the upper limit value is set high, a transport method in which only a single plug exists in the pipe can be realized. If the propulsion distance is relatively short, a transport method in which only a single plug exists in the pipe may be appropriate. If the propulsion distance is relatively long, a transport method in which multiple plugs are present in the pipe may be appropriate. There is. According to the present invention, it is possible to easily change the transportation method only by changing the threshold.

Embodiment 2. FIG.
FIG. 3 is a diagram showing a configuration of excavated earth and sand carrying-out apparatus and related equipment according to another embodiment of the present invention. The basic configuration of the present embodiment is almost the same as that of the first embodiment described above, but the opening / closing control method of the air introduction valve 20 is different from that of the first embodiment.

  In the present embodiment, as in the first embodiment, the intake pipe 24 is equipped with the first air flow meter 32 or the pressure gauge 34, and the intake air amount or the intake pipe pressure is measured. In addition, a mud flow meter 36 is installed in the mud pipe 14 to measure the amount of mud discharged from the mud tank 12 and transported.

  The personal computer 50 in FIG. 2 is provided with an upper limit threshold value of the intake air flow rate by the first air flow meter 32 or an upper limit threshold value of the pressure gauge 34 as in the first embodiment, and the upper limit value is exceeded. In this case, the air introduction valve 20 is closed, and the mud from the mud tank 12 is discharged to the mud pipe 14. The operation at this time is the same as that of the first embodiment.

  Further, after the air introduction valve 20 is closed, the exhaust mud flow meter 36 integrates the flow rate of the waste mud, and when the integrated value exceeds a certain value, the air introduction valve 20 is opened.

Embodiment 3. FIG.
FIG. 4 is a diagram showing the configuration of the excavated sediment transport control device and related equipment according to Embodiment 3 of the present invention. The basic configuration of the present embodiment is also substantially the same as that of the first embodiment described above, but the open / close control method of the air introduction valve 20 is different from that of the first embodiment.

  In the present embodiment, as in the first embodiment, the intake pipe 24 is equipped with the first air flow meter 32 or the pressure gauge 34, and the intake air amount or the intake pipe pressure is measured. In addition, the weight tank 38 is equipped to the waste mud tank 12 and the weight of the waste mud in the waste mud tank 12 is measured.

  As in the case of the first embodiment, the personal computer 50 of FIG. 2 is provided with an upper limit threshold value of the intake air flow rate by the first air flow meter 32 or an upper limit threshold value of the pressure gauge 34, and this upper limit value is set. When it exceeds, the air introduction valve 20 is closed and the mud in the mud tank 12 is discharged to the mud pipe 14. The operation at this time is also the same as that of the first embodiment.

Further, the weight reduction value of the sludge tank 12 is measured by the weight meter 38 attached to the sludge tank 12, and the air introduction valve 20 is opened when the weight reduction value exceeds a certain value. To do. That is, the personal computer 50 in FIG. 2 stores the weight value W ₀ when the air introduction valve 20 is closed, and calculates the absolute value of the difference from the weight value W _i measured every moment. When the calculated value exceeds a certain value, the air introduction valve 20 is opened.

Embodiment 4 FIG.
FIG. 5 is a diagram showing a configuration of excavated earth and sand carrying-out apparatus and related equipment according to Embodiment 4 of the present invention. The basic configuration of the present embodiment is substantially the same as that of the first embodiment described above, but the opening / closing control method of the air introduction valve 20 is different from that of the first embodiment.

  In the present embodiment, a hold-up sensor 40 is installed in the middle of the mud pipe 14. Control is performed by detecting the passage of the plug 60 at that position from the signal value of the sensor 40 and closing the air introduction valve 20 after a predetermined time has elapsed from the detection time.

  The hold-up sensor 40 is a sensor that measures the fluid occupancy rate in the mud pipe 14, but before and after passing through the plug 60, the measured value outputs the sediment level in the mud pipe 14. A signal indicating that the occupation ratio in the tube is almost 100% is output. It is determined that the plug has passed when a signal indicating that the occupation ratio is approximately 100% is output. After passing through the plug, the air introduction valve 20 is closed at a certain time interval, and conveyance of the next plug is started. This time interval is set so that there is only a single plug in the sludge pipe 14.

When the propulsion distance is relatively short, a transportation method in which only a single plug is present is more appropriate than a transportation method in which a plurality of plugs are present in the sludge pipe 14. This embodiment is a simple and efficient method for realizing a transportation method in which only a single plug exists.
A transportation method in which a plurality of plugs are present can be easily realized by resetting the installation position of the hold-up sensor 40 and the time interval until the air introduction valve 20 is closed.
In order to reopen the air introduction valve 20 after closing it, the lower limit threshold value of the first air flow meter 32 and the lower limit threshold value of the pressure gauge 34 may be used as described above.

Embodiment 5. FIG.
FIG. 6 is a diagram showing the configuration of the excavated earth and sand carrying-out device and related equipment according to Embodiment 5 of the present invention. Is also the basic configuration of this embodiment is substantially the same as the above-described first embodiment, the control method of the air inlet valve 20 is different from the first embodiment.

In the present embodiment, the second air flow meter 35 is installed on the upstream side of the air introduction valve 20 to measure the amount of air sucked into the mud pipe 14. The personal computer 50 of FIG. 2, in advance an upper limit threshold value of the air intake amount, if the value measured by the second air flow meter 35 exceeds the upper limit, the air inlet valve 20 It closes and the mud in the mud tank 12 is discharged to the mud pipe 14.

Embodiment 6. FIG.
7 and 8 are views showing a part of the excavation earth and sand carrying-out device according to Embodiment 6 of the present invention.
In the first to fifth embodiments described so far, the example in which the tip of the mud pipe 14 is connected to the outlet of the mud tank 12 has been shown, but the configuration of this part is not limited thereto, and the mud It is only necessary that the sludge tank 12 and the sludge pipe 14 are substantially connected so that the sludge pipe 14 can suck the sludge in the tank 12.

The control for closing the air introduction valve 20 may be performed at predetermined intervals by a timer in addition to the method shown in each embodiment.
In addition to the method shown in each embodiment, the control for opening the air introduction valve 20 is configured to measure the length of the plug by providing a hold-up sensor 40 on the distal end side of the mud pipe 14. When the length reaches a predetermined length, the air introduction valve 20 may be opened.
Furthermore, the air introduction valve 20 can be opened and closed by appropriately combining the methods shown in the embodiments.

It is the figure which showed the structure of the excavation earth and sand carrying-out control apparatus which concerns on Embodiment 1 of this invention, and its related installation. It is a block diagram of the control apparatus of the air introduction valve of the present invention. It is the figure which showed the structure of the excavation earth and sand carrying-out control apparatus which concerns on Embodiment 2 of this invention, and its related installation. It is the figure which showed the structure of the excavation earth and sand carrying-out control apparatus which concerns on Embodiment 3 of this invention, and the related equipment. It is the figure which showed the structure of the excavation earth and sand carrying-out control apparatus which concerns on Embodiment 4 of this invention, and its related installation. It is the figure which showed the structure of the excavation earth and sand carrying-out control apparatus which concerns on Embodiment 5 of this invention, and its related installation. It is the figure which showed a part of excavation earth and sand carrying-out control apparatus which concerns on Embodiment 6 of this invention. It is the figure which showed another example of the part corresponded in FIG.

Explanation of symbols

12 Waste mud tank, 14 Waste mud pipe, 18 Air introduction pipe, 20 Air introduction valve,
22 Receiver tank, 24 Intake pipe, 26 Waste mud unit (vacuum pump), 32 First air flow meter, 34 Pressure gauge, 35 Second air flow meter, 36 Waste mud flow meter, 38 Weigh scale, 40 Hold up Sensor, 60 plug.

Claims (1)

  A mud pipe having one end connected to the mud tank and the other end connected to the receiver tank, and a vacuum pump connected to the receiver tank via an intake pipe for vacuum suction inside the mud pipe And a valve provided on the mud tank side of the mud pipe via an air introduction pipe, and when the valve is opened, the inflow of the mud from the mud tank to the mud pipe is stopped. An air introduction valve provided, an air flow meter provided upstream of the air introduction valve for measuring the air flow rate to the air introduction valve, and the air introduction valve opened and closed based on predetermined conditions Excavation sediment characterized by comprising: a valve control means for making the waste mud into a plug shape and carrying it out as a plug, and closing the air introduction valve when the output of the air flow meter exceeds a predetermined upper limit value Unloading control device.

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