JP3688660B2 - High depth soil removal system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a high-depth mud drainage system for discharging mixed discharges such as excavated earth and sand and mud from a construction site to various types of underground work and the like to a high ground part or the like through a shaft.
[0002]
[Prior art]
When tunnel construction such as sewerage, subway, and joint ditch is carried out by the mud concentration type propulsion method, which is lower in cost than the shield method, for example, high concentration mud is fed along with the excavation, and mixed discharge such as excavated earth and sand and mud is generated. It will be discharged through the shaft by the sludge pipe .
[0003]
The waste mud is discharged by using a vacuum pump as a vacuum device installed on the ground, thereby applying negative pressure. Solid materials such as earth and sand and gravel are mixed horizontally with water and air in a plug flow state. It is conveyed in the direction pipe. Here, the big problem is the decrease in the soil removal efficiency due to the deepening of the depth. Where the resistance depth exceeds 10m, the suction soil removal method using the conventional vacuum pump seems to think. It is not possible to secure a sufficient soil removal efficiency.
[0004]
The reason for this is that if solids, water, and air are mixed in the vertical pipe, it can be transported by the air lift effect and vacuum pressure, but the centrifugal force acts on the curved part that changes from the horizontal direction to the vertical direction. Therefore, solids, water and air are separated, and the rising height of water can be up to about 10 m in principle with only the vacuum pressure, but in practice it is 6 to 8 m depending on the performance limit on the pump. Degree. Therefore, even if a pump capable of generating a large air amount (air amount) is installed in anticipation of the air lift effect, the limit is about 10 m.
[0005]
For this reason, a machine body such as a suction tank and a pump may be installed underground and discharged to the spot. In this case, it is possible to pump water with the pump, Gradually accumulates in the field and the processing becomes difficult.
[0006]
Applicant performs the drainage from the underground construction site where the depth is deeper through the shaft, but as a high depth drainage system that can efficiently drain to the ground without leaving sediment on the way, Japanese Patent Application 2000 -141195 (JP 2001-323775) was filed.
[0007]
As shown in FIG. 10, a squeeze pump 13 as a pumping pump and an evacuation tank 16 having an air reservoir 14 in the upper part and a sediment reservoir 15 in the lower part are attached to the squeeze pump 13 in the middle of the shaft 1. The air reservoir 14 of the tank 16 is connected to an air discharge pipe 18 connected to a vacuum device 6 comprising a ground vacuum pump 6a and a mud tank 6b, and the earth and sand + mud water is discharged to the earth and sand reservoir 15. The pipe 19 is connected via a squeeze pump 13. In the figure, 17 is an air + earth + mud water suction pipe, 27 is a waste mud tank, 26a and 26b are valves, and 19a and 19b are pipes.
[0008]
FIG. 10 shows the case of the mud-type propulsion method, in which a main push jack 3 is provided on the starting shaft 1 and a column of tubes (fume tubes) 5 having a cutter 4 disposed at the tip is advanced from the shaft 1. The mixed discharge such as earth and sand and muddy water excavated along with the excavation is discharged through the shaft 1.
[0009]
In this way, by providing the squeeze pump 13 as a pumping pump in the middle of the shaft 1, the pumping pressure can be used to transport the mud to the ground at a high place, and the air, water and earth and sand sent to the tank 16 The air is separated into the upper air reservoir, the water and sediment are separated into the lower sediment reservoir, the air in the air reservoir is sucked into the vacuum device, and the air reservoir is always kept in a vacuum state, so air + earth + A slug flow or a plug flow that is not adversely affected by air can be generated in the muddy water suction pipe .
[0010]
[Problems to be solved by the invention]
A combination of a soil discharge tank having such an air reservoir and a pump for pumping, and using the pump pressure of the pump for pumping to efficiently drain the soil to the ground at a high place, the pump for pumping from the soil discharge tank In addition, it is necessary to devise a method for forcibly sending earth and sand and muddy water , and further, there is a problem in the soil discharge balance between the vacuum pump and the pump for pressure feeding.
[0011]
If the control for ensuring this balance is not appropriate, clogging will occur in the pipes, an excessive load will be applied to the equipment, and efficiency will be reduced.
[0012]
The object of the present invention is to eliminate the inconvenience of the conventional example, and to discharge the soil from a deep underground construction site via a rising path such as a shaft, but can efficiently discharge without leaving deposits on the way. In addition, it is an object of the present invention to provide a high-depth soil removal system capable of suitable control when the system is assembled as an automatic control system.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a pumping pump and a pumping pump attached to the pumping pump in the earthing system for sending the earthing from an underground construction site to a vacuum device on the ground through a rising path such as a shaft. A tank is installed, and the soil discharge tank is filled with air at the top, a screw feeder as a discharge mechanism is installed at the bottom, accepts earth and sand + muddy water and air from the underground construction site, sends only air upward, A screw feeder is used to send soil and mud up through the pressure pump. A level meter is installed in the soil discharge tank, and a flow meter is installed between the screw feeder and the pressure pump in the soil discharge tank. rotational speed with increasing value of the rotational speed of the level meter pressure pump by the value of total also controlled to rise matches the labels, also dumping amount converted from Honpu rpm Rotation of the screw feeder to calculate the earth removal efficiency, which is a value comparing the amount of earth discharge measured by the flowmeter and the value of the earth discharge amount, and when the earth removal efficiency is below a certain value, the rotational speed is increased accordingly. The gist is to perform rotation control of the screw feeder so as to give an instruction .
[0014]
According to the present invention, by providing a soil removal tank and a pressure pump as a soil removal device in the middle of a climbing path such as a vertical shaft, the waste mud can be transported to the high ground by using the pump pressure of the pressure pump. The earth and sand + muddy water and air sent to the tank are separated into the air reservoir in the upper part, and the earth and mud water are separated into the lower screw feeder. And this only air of the air reservoir is is sucked by a vacuum pump or the like, since air reservoir always vacuum state is maintained, slug flow without adverse effects due to fluctuations in the air pressure difference in sediment + muddy water from the screw feeder Alternatively, a plug flow is generated, and a smooth pumping pump without clogging becomes possible. In addition, by using a screw feeder, earth and sand + mud water can be forcibly fed into the pressure feed pump.
[0015]
And, in such a soil removal tank and a pressure pump pump, a level meter and a flow meter are provided as measuring devices, and it is confirmed that the amount of “ sediment + muddy water ” that has been suctioned and discharged becomes a certain amount in the soil discharge tank. Detected by a level meter installed in the soil removal tank, the screw feeder installed at the lower part of the soil disposal tank rotates at a low speed, and " soil + mud " is forcibly sent out to the pressure pump.
[0016]
On the other hand, with the pumping pump, the rotational speed (soil discharge amount) increases with the increase of the level meter in the soil discharge tank. On the other hand, the measured value of the flow meter installed on the discharge side of the screw feeder and the rotation of the pump pump When the value calculated from the floor is compared and the soil removal efficiency becomes constant (for example, 80% or less), the rotation speed of the screw feeder is increased accordingly, and this is automatically looped. By doing this, the optimal earth removal work can be realized.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an essential part showing an embodiment of a high-depth soil removal system of the present invention, FIG. 2 is an explanatory view of the same essential part, 3 is a side view of the entire part, and FIG. 4 is an explanatory view of a control method. The same components as those in FIG. 10 showing the conventional example are given the same reference numerals.
[0018]
As shown in FIG. 3, this embodiment is also a mud-type propulsion method similar to the conventional example shown in FIG. 10, and is provided with a bearing wall 2 and a main pushing jack 3 in the starting shaft 1 and a cutter at the tip. A vertical row of pipe bodies (fume pipes) 5 provided with 4 is excavated from the shaft 1, and high-concentration mud water (drained mud) excavated along with the excavation is discharged through the shaft 1.
[0019]
This drainage mud is performed by applying a negative pressure by a vacuum device 6 comprising a vacuum pump 6a and a mud tank 6b installed on the ground. In the present invention, the squeeze pump 13 and the squeeze pump are used as a pumping pump in the middle of the shaft 1. As an attachment to the pump 13, an air reservoir 14 is provided at the upper portion, and a soil discharge tank 16 having a screw feeder 7 as a discharge mechanism is provided at the lower portion. The screw feeder 7 includes a screw conveyor 7a and a screw motor 7b for rotating the screw conveyor 7a.
[0020]
If the pump is small and has a large protruding pressure, a mono pump, a piston pump, a diaphragm pump, or the like can be used. However, the squeeze pump 13 has a high pumping capacity and has a certain size. It can also be used for this type, can be placed in a small space, and can be directly connected to a vacuum tank. In addition, the squeeze pump 13 is inexpensive because replacement parts and the like are inexpensive, and is suitable from the requirements of durability and maintainability. As shown in FIG. 5, the squeeze pump 13 is generated by the powerful restoring force of the crushed hose, with two sliding shoes 13b attached to the rotor 13a rotating and sliding along the pump hose 13c by a special rubber hose. This is a positive displacement seal pump that discharges the sucked fluid by the movement of the sliding shoe 13b by vacuum. In the figure, 13d indicates a shim and 13e indicates an oil level.
[0021]
For the drive of the squeeze pump 13 and the squeeze pump 13, an inverter motor having a constant torque value is adopted regardless of the rotational speed.
[0022]
On the other hand, the earth removal tank 16 is opened by connecting an air + earth + sand + muddy water suction pipe 17 guided from the cutter chamber of the cutter 4 to the air reservoir 14 as an underground construction site. An air discharge pipe 18 is connected to the air reservoir 14 and an end thereof is opened.
[0023]
Further, the squeeze pump 13 is connected to the discharge side of the screw feeder 7 of the soil discharge tank 16, and the earth and sand + mud discharge pipe 19 from the squeeze pump 13 is connected to the mud tank 6b of the vacuum device 6 installed on the ground. Lead.
[0024]
As for the screw conveyor 7a of the screw feeder 7 of the earth removal tank 16, an appropriate rake diameter and a screw diameter that can correspond to the mixing rate are selected in accordance with the relationship between the size of the mass of the conveyed product and the diameter of the blades. For the screw horsepower, the method for calculating the horsepower of the screw conveyor used in the earth pressure shield was referred. The screw motor 7b employs an inverter system in which torque does not drop and control is possible even if the rotation speed changes.
[0025]
Moreover, in order to generate discharge pressure by rotating the screw, a method of gradually shortening the pitch of the screw blades was adopted, and a reverse blade was adopted because there was a risk that the soil was consolidated at the end of the screw.
[0026]
As described above, the present invention divides the apparatus into two parts: (1) earth removal tank part (2) pumping pump part, and is arranged so that each function can be arranged in a standing free space. As an example, the earth removal tank 16 is on the stage on the lowest beam. Further, the positional relationship between the soil discharge tank 16 and the squeeze pump 13 is not limited to the horizontal direction as shown in the figure, and may be up and down.
[0027]
A level meter 8 is installed in the earth removal tank 16, and an electromagnetic flow meter 9 is provided between the screw feeder 7 of the earth removal tank 16 and a squeeze pump 13 as a pressure feed pump.
[0028]
The level meter 8 can be used in a vacuum tank, and it is desired to be able to perform stable measurement even in a situation where the liquid level undulates, and two types of capacitance type or electromagnetic wave type are effective.
[0029]
As shown in Fig. 4, the amount of mud carried into the soil discharge tank 16 is output from the soil discharge tank 16 level meter to two systems, and the indication system (1) operates according to the required rotational speed of the pump. The instruction and instruction system (2) compares the value of the electromagnetic flow meter directly connected to the pressure pump with the required amount of soil removal, and if the soil removal efficiency is lower than a set value, the rotation of the screw conveyor 7a of the screw feeder 7 Instruct. In the figure, 10 is a control control panel, and 11 is an electromagnetic flow meter converter connected to the electromagnetic flow meter 9. In FIG. 1, 12 is an inverter control panel, which serves both for the screw feeder 7 and the squeeze pump 13, and 20 is an inverter storage box.
[0030]
Next, the usage and operation will be described. The mud discharged from the air, water and earth and sand in the cutter 4 is guided into the earth discharging tank 16 from the air + earth and sand + mud water suction pipe 17. The air, earth and sand, and muddy water transported by suction discharge are separated into air and muddy water and earth and sand by sending the other muddy water and earth and sand to the bottom, and the air is vacuumed as usual. The pump 6a is carried out, and the muddy water and the earth and sand are carried out on the stand by the squeeze pump 13.
[0031]
In order to send the muddy water and earth and sand from the earth discharging tank 16 to the squeeze pump 13, it is possible to forcibly feed them by the action of the screw conveyor 7a of the screw feeder 7.
[0032]
In the present invention, as an automatic control system, a control system using the value of the level meter 8 in the soil removal tank 16 as a trigger is constructed.
[0033]
The value of the level meter 8 installed in the earth removal tank 16 rises from the “ earth and sand + muddy water ” that has been sucked out, and the screw feeder 7 installed at the lower part of the earth removal tank 16 rotates at a low speed, and the squeeze pump 13 Forcibly send out " earth and sand + muddy water ".
[0034]
FIG. 6 shows an example of setting the rotation speed of the squeeze pump 13 as a pressure feed pump. Set the moving average time to 20 seconds and measure. (Time can be changed) In FIG. 6, the vertical axis represents the amount of soil converted from the pump rotation speed, and the horizontal axis represents the level value in the soil discharge tank. The pump rotation speed with respect to the level value is a parameter that can be easily converted, and the set value can be changed according to the on-site condition and soil condition.
[0035]
FIG. 7 shows an example of setting the screw rotation speed. The moving average time is 20 seconds, the average value of the electromagnetic flow meter value is compared with the set pump value, and the efficiency is considered as the soil removal efficiency, as shown (moving average time can also be changed) Initial settings have been made. Similarly, the screw feeder rotation speed with respect to the level value is a parameter that can be easily converted, and the set value can be changed according to the on-site condition and soil condition.
[0036]
In this way, the squeeze pump 13 that is a pumping pump increases the rotational speed (the amount of soil discharged) as the value of the level meter 8 in the soil discharging tank 16 increases. In other words, the zero point and the maximum point of the level gauge 8 in the soil removal tank 16 are calculated from the effective tank length, and the pressure pump is operated by proportionally outputting the level value in the tank and the pump rotation speed (soil discharge amount). Let
[0037]
Measure the moving average measurement value of 10% or more with the level meter 8 in the soil removal tank 16, perform the required soil volume conversion (m ³ / min), and linearize the rotation speed of the squeeze pump 13 with the value of the level meter 8 Control by relationship. Stops automatically when the tank level is 10 or less.
[0038]
On the other hand, comparing the measured value of the electromagnetic flow meter 9 installed at the discharge port of the screw feeder 7 with the value calculated from the rotary bed of the squeeze pump 13 which is a pressure pump, the soil removal efficiency became 80% or less. In this case, an instruction is issued to increase the rotational speed of the screw feeder 7 accordingly. (The rotational speed of the screw feeder 7 required is controlled based on the value of the soil removal efficiency to obtain a linear relationship.) By performing this loop operation automatically, the optimum soil removal operation can be realized. A detailed flow is shown in FIGS. The numerical parameters can be changed.
[0039]
Arranging workers for operation directly increases costs, so it works automatically to some extent, and considers switching to manual operation so that machine operators can easily cope with troubles. . (See Figure 9)
[0040]
【The invention's effect】
As described above, the high-depth soil removal system of the present invention efficiently discharges soil from a deep underground construction site through a rising path such as a shaft without leaving any deposits in the middle. In addition, it is suitable when the system is assembled as an automatic control system.
[0041]
And the following effect can be exhibited by performing control of the present invention.
-Construction efficiency can be increased by increasing the soil removal efficiency.
・ Soil removal work is possible with the optimal pump and screw feeder rotation speed. (Lower cost of electricity consumption)
-It is possible to eliminate the workers to paste for operating the soil removal equipment.
-In the past, separation tanks and earth removal tanks were installed for earth removal, but they can be loaded directly into the tank for transportation, and costs can be reduced.
[0042]
Further, in the present invention, the important pump rotation speed and screw feeder rotation speed for operating the automatic control system, and the “moving average time” for measuring and averaging the values, the maximum and minimum tank level values, As a result, it is possible to easily change the parameter value for the pump rotation speed (not only one straight line, but also multiple straight lines), so that it is possible to cope with various on-site conditions and soil conditions.
[0043]
Moreover, if the thing thrown into a soil discharge tank has a certain amount of fluidity, not only the vertical direction but also lateral pressure feeding is possible.
[Brief description of the drawings]
FIG. 1 is a front view of essential parts showing an embodiment of a high-depth soil removal system of the present invention.
FIG. 2 is a front view of a main part showing an embodiment of a high-depth soil removal system of the present invention.
FIG. 3 is an explanatory diagram of a main part showing an embodiment of a high-depth soil removal system of the present invention.
FIG. 4 is an explanatory diagram of a control method showing one embodiment of a high-depth soil removal system of the present invention.
FIG. 5 is a longitudinal side view of a pumping pump used in the deep soil removal system of the present invention.
FIG. 6 is a graph showing the setting of the number of revolutions of a pumping pump in the deep soil removal system of the present invention.
FIG. 7 is a graph showing the setting of the screw conveyor rotation speed of the screw feeder in the high-depth soil discharging system of the present invention.
FIG. 8 is a control flowchart in the high-depth soil removal system of the present invention.
FIG. 9 is an efficiency control flowchart in the deep soil removal system of the present invention.
FIG. 10 is an explanatory diagram showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vertical shaft 2 ... Supporting wall 3 ... Main pushing jack 4 ... Cutter 5 ... Pipe body 6 ... Vacuum device 6a ... Vacuum pump 6b ... Waste mud tank 7 ... Screw feeder 7a ... Screw conveyor 7b ... Screw motor 8 ... Level meter 9 ... Electromagnetic flow meter
10 ... Control panel 11 ... Electromagnetic flowmeter converter
12… Inverter control panel
13 ... Squeeze pump
13a ... Rotor 13b ... Sliding shoe
13c ... Pump hose 13d ... Shim
13e ... Oil level
14 ... Air reservoir 15 ... Sediment reservoir
16 ... Tank 17 ... Air + earth + mud suction pipe
18 ... Air discharge pipe 19 ... Sand sand + Muddy water discharge pipe
19a, 19b ... pipe 20 ... inverter storage box
26a, 26b ... Valve 27 ... Mud tank

Claims (1)

In a soil removal system that sends soil from an underground construction site to a vacuum device on the ground via an ascending route such as a shaft, a pressure pump and a soil discharge tank are installed as an attachment to the pressure pump. Air is accumulated in the upper part, and a screw feeder is installed as a discharge mechanism in the lower part. It accepts the excavated soil, muddy water, and mixed soil from the underground construction site, and sends only air upward. A feeder is used to send soil + mud water upward through the pressure pump. A level meter is installed in the soil discharge tank, and a flow meter is installed between the screw feeder and the pressure pump in the soil discharge tank. also varied to control the dumping of sediment + mud rpm rotational speed of the pressure pump with changes in value of the level meter value, also, earth removal weight converted from Honpu rpm Value is compared with the value of the amount of soil measured by the flow meter, and when the soil removal efficiency is below a certain value, the screw feeder's speed is increased accordingly. A high-depth soil removal system that controls the rotation of the screw feeder so as to give rotation instructions .

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