JPH08270382A - Facing stability control device in muddy water type shield machine - Google Patents

Abstract

PURPOSE: To improve workability by providing a computing device comparing working face data detected by a working face data detecting means with viscosity of muddy water measured by a viscosimeter so as to obtain a thickener addition quantity, and a thickener feed means for a mud feed pipe. CONSTITUTION: A computing device 62 monitors stability of a facing based on facing data, and judges the condition of muddy water from data detected with a viscosimeter 60, a flowmeter 64, and a densimeter 68 provided on a mud feed pipe 44. Next, the degree of collapse of the facing is judged from data of a flowmeter 66 and a viscosimeter 70 provided on a mud discharge pipe 48. Next, the device 62 computes a drilled dry sand quantity and a drilled deviated flow, and when looseness of the facing and the like is expected, outputs control signals for a thickener quantity necessary for obtaining appropriate viscosity of muddy water and a filling material quantity necessary for preventing mud release. Further, pump control devices 72, 74 receive the signals, and control snake pumps 56, 58 so as to feed necessary quantities of thickener and filling material to the pipe 44. Hereby, muddy water can be quickly adjusted according to change in working face, and ground facilities can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a face stabilizing control device for a muddy water shield machine, and more particularly to a face stabilizing control device for a muddy water shield machine for quick response of face management and area saving of ground facilities.

[0002]

2. Description of the Related Art As is well known, in a muddy water type shield machine, the earth and sand scraped off by a cutter in the front part of the shield machine and taken into the shield chamber is agitated with the muddy water supplied through a mud pipe to discharge the sludge. It is discharged to the outside through a pipe.

In such a muddy water shield machine, the shield chamber between the partition wall and the face is filled with pressurized muddy water to stabilize the face, and the excavated earth and sand are taken into the muddy water to be discharged as muddy water on the ground. The fluid is transported to a muddy water treatment facility, and the muddy water treatment facility classifies the soil and sand content to adjust the mud to a predetermined property, and then reuses it again as muddy water.

In this way, when the face is stably controlled on the ground, for example, as shown in FIG. 11, in the ground equipment, the segment stockyard 1, the fresh water tank 2, the adjusting tank 3, the vibrating sieve 4, the belt conveyor 5 are used. , 6, filter press 7, water purification tank 8, PH control device 9, PAC storage tank 10, truck loading section 11, surplus mud water tank 12, earth and sand hoppers 13, 14, and mud storage tank 1 for mud water management
5, mud making tank 16, clay storage yard 17, CMC melting tank 1
8, CMC storage yard 19 and the like are provided.

Further, as described above, in addition to the case where muddy water treatment equipment is installed on the ground to stably control the face on the ground, the case where muddy water management equipment is installed inside the starting shaft to stably control the face inside the starting shaft. there were.

[0006]

The conventional muddy water shield machine has the following problems.

First, when mud is adjusted on the ground or at a starting shaft and sent to a face as in the conventional case, after confirming a change in stability of the face, the muddy water is adjusted according to the change in the stability of the face, and The adjusted mud is sent to the shield chamber via the mud pipe.In such a state, even if the mud is sent immediately after the mud is adjusted, the adjusted mud will reach the face. Since it takes a considerable amount of time, looseness or collapse of the face may occur between the time when the adjusted mud water reaches the face after the change in stability of the face is detected, and quick response to face management is required. There was a problem that it was difficult to do. For example, in the case of a shield with an excavation distance of 1000 m, the mud flow rate is generally 2 m / m even if the mud is sent immediately after the mud is adjusted according to changes in the stability of the face.
Since it is sec, it takes about 8 minutes for the adjusted muddy water to reach the face, and it takes 8 minutes or more after the change in stability of the face is detected.

Further, when mud management is performed on the ground or at the starting shaft as in the conventional case, the mud storage tank 15, the mud production tank 16,
Clay storage yard 17, CMC dissolution tank 18, CMC storage yard 19 and other muddy water management facilities are required. Due to this muddy water management facility, a vast area is required as ground equipment or muddy water management in the starting shaft. When installing the equipment, there was a problem that a large vertical shaft was required, and the required area of the above-ground equipment was expanded accordingly.

Particularly in urban areas, it is becoming difficult to secure a vast land area for above-ground equipment, and it is thus necessary to secure sufficient land for above-ground equipment. If not, there was a problem that tunnel excavation had become difficult.

For example, when excavating a new tunnel for water and sewerage in place of an old water and sewer system, there is a park or vacant land when excavating the old tunnel.
We installed ground facilities there, but nowadays, due to changes in the environment, there are cases where parks and vacant lots cannot be used as work spaces, which makes it impossible to secure a large land area for ground facilities. Such cases occur.

Further, in the conventional muddy water type shield construction method, an adjusting tank 3 for the muddy water stock having a mud transport amount of about 10 minutes is usually required as a measure against lost mud, etc.
Moreover, since the adjustment tank 3 adjusts the muddy water, the adjustment tank 3 is used to cover all the stock amount, which causes the adjustment tank 3 to be large and the land area for the above-ground equipment to be increased accordingly. was there.

The present invention has been made by paying attention to the above-mentioned conventional problems, and the purpose thereof is to enable swift response to face management, and to reduce the amount of muddy water stock for muddy water management equipment and measures against sludge loss. Accordingly, it is an object of the present invention to provide a face stabilizing control device for a muddy water shield machine, which can reduce the land area for ground facilities and save the area.

[0013]

In order to achieve the above object, a first invention is a muddy water system for supplying muddy water to a shield chamber through a mud pipe and discharging muddy water in the shield chamber through a mud pipe. In the shield machine, a viscometer that is provided in the mud pipe to measure the viscosity of the mud flowing in the mud pipe, the face data that detects the state of the face by the face data detection means, and the viscosity of the mud measured by the viscometer. Comparing the addition amount of the thickening agent to obtain the addition amount of the thickening agent, and an addition material supply means for supplying the thickening agent into the mud pipe based on the addition amount of the thickening agent obtained by the calculation device Is characterized by.

In a second aspect based on the first aspect, the face data detecting means includes a soil layer discriminating device for detecting soil layer discriminating data, and the arithmetic unit fills based on the soil layer discriminating data. The amount of added material is calculated, and the added material supply means
It is characterized in that, in addition to the thickening material, the filling material is supplied into the mud pipe based on the amount of the filling material added.

According to a third aspect of the present invention, in the first or second aspect of the invention, a flow meter is provided in the mud sending pipe, and the arithmetic unit determines the property of the mud sending water from each data of viscosity and flow rate of the mud sending water. A face stability control device for a muddy water shield machine.

In a fourth aspect based on the third aspect, the viscometer, the flowmeter, and the densitometer are provided in front of the additive material supplying means, and the arithmetic unit receives information from the respective instruments. It is characterized in that the adjustment status is judged and feedback control of the additive supply means is performed.

According to a fifth aspect of the invention, in the first or third aspect of the invention, a flow meter and a density meter are provided in the sludge pipe,
The arithmetic unit is characterized by judging the degree of face collapse and lost mud from each data of the flow rate and density of discharged mud water.

In a sixth aspect based on the second aspect, the additive supply means has a thickener tank and a filler tank for containing the thickener and the filler, respectively, and the thickener from these tanks. And a thickening material addition pump for supplying the filling material into the mud pipe and the filling material addition pump, and the thickening material addition pump and the filling material addition pump based on the addition amount control signal from the arithmetic unit. Thickening material addition pump control device and thickening material addition pump control device for controlling the addition amount of the thickening material and the filling material, and the thickening material and the filling material supplied in the mud feeding pipe using the mud flow And a line mixer for stirring and mixing.

[0019]

In the first aspect of the present invention having the above-mentioned structure, the cutting face data detecting means detects the state of the cutting face and transmits the cutting face data to the arithmetic unit. The viscosity of the flowing mud is measured and transmitted to the arithmetic unit. The arithmetic unit compares the face data and the viscosity of the muddy water to obtain the addition amount of the thickening agent, and sends the addition amount to the additive feeding means. The additive supply means supplies the thickener into the mud feed pipe based on the added amount of the thickener transmitted from the arithmetic unit.

In this way, by supplying the thickening agent directly to the mud flowing in the mud pipe in the middle of the mud pipe, adjusting the viscosity of the mud and supplying it to the face, from the mud water adjusting facility to the face. It is possible to shorten the distance of the cutting face, and as a result, it is possible to greatly reduce the time from detecting the change in the stability of the cutting face to the sending of the adjusted mud to the cutting face by using the cutting face data, and to quickly manage the cutting face. You can deal with it. In addition, since the adjustment of mud water is also performed by directly supplying the thickening agent into the mud pipe, the adjustment time of mud water can be shortened and the corresponding time can be shortened.

Therefore, it is possible to reliably prevent the face from loosening or collapsing due to a delay in handling after detecting the change in face stability as in the prior art and before supplying the adjusted mud to the face.

Further, since mud water is adjusted by directly supplying the thickening agent into the mud pipe, the mud storage tank, mud tank, clay storage yard, CMC dissolution tank, CMC are provided on the ground or at the starting shaft.
There is no need to install muddy water management equipment such as a storage yard, and the area required to install this muddy water management equipment is no longer necessary, and it is possible to greatly reduce the required area for aboveground equipment and save area. Even if it is difficult to secure a vast land area for above-ground equipment such as a part, construction can be performed.

In the second invention, the soil layer discriminating device detects the soil layer discriminating data, and the arithmetic unit calculates the amount of the filling material added based on the soil layer discriminating data, and the additive material supplying means. By supplying the filling material into the mud pipe by
The muddy water can be adjusted to the optimum state according to the condition of the soil layer of the face, and since the filling material is supplied directly into the mud pipe, it is possible to prevent the mud and face from collapsing during excavation of the gravel layer. It will be possible to respond promptly.

According to the third aspect of the present invention, the mud preparation is facilitated by determining the properties of the mud sending water by the arithmetic unit from the viscosity and the flow rate of the mud sending water measured by the viscometer and the flow meter provided in the mud sending pipe. Can be

In the fourth aspect of the invention, a viscometer and a flow meter are provided in front of the additive material supplying means, and the arithmetic unit determines the adjustment status based on the information from each instrument, and the additive material supplying means. By performing the feedback control of, it is possible to perform more accurate mud adjustment according to the situation of the face.

In the fifth invention, a density meter is provided in the mud pipe, and a flow meter and a density meter are provided in the mud pipe.
By determining the degree of face collapse and lost mud from each data of the flow rate and density of the discharged mud by the arithmetic device, the state of the face can be grasped more accurately, and the stable management of the face can be made more reliable.

In the sixth invention, a thickener tank, a filling tank, a thickener addition pump, a filling material addition pump, a thickening material addition pump control device, a filling material addition pump control device, and By configuring the additive material supply means with the line mixer, each additive pump control device controls each additive pump to supply an accurate amount of thickening material and filling material from each tank into the mud pipe. Therefore, the muddy water can be adjusted accurately and in a short time, and the optimal face management can be performed in real time.

Further, the thickening material and the filling material supplied into the mud feeding pipe by the line mixer can be mixed with the mud water by using the energy of the mud flow, and the mechanism for stirring and mixing can be simplified. Can be miniaturized.

[0029]

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 10 are views showing a face stabilizing control device of a muddy water type shield machine according to an embodiment of the present invention.

In this muddy water shield machine 34, a starting shaft 32 is excavated from a ground facility 30 provided on the ground to a predetermined depth, and a segment is formed by horizontally excavating from the bottom position of the starting shaft 32 in the ground. Tunnel 3 while assembled
I am trying to build 6.

This shield machine 34 is of a muddy type,
The mud water is supplied from the ground to the inside of the shield chamber 42 between the shield machine main body 38 and the cutter disk 40 via the mud pipe 44 to fill the inside of the shield chamber 42 with the pressurized mud to stabilize the face 46. At the same time, the excavated earth and sand are taken into mud water, and as mud water, fluid is transported to the ground through the mud pipe 48, and the earth and sand are classified on the ground.
The mud is adjusted to the specified properties and is reused as mud water.

In this embodiment, in order to stabilize the cutting face, a face stabilization control device 20 for managing muddy water in the tunnel 36 is adopted.

The face stability control device 20 controls the face 46 stably by controlling the viscosity of the mud water in the middle of the mud pipe 44 in the tunnel 36 at the rear position of the shield machine 34. 60, an arithmetic unit 62,
An additive material supply means 80, and the additive material supply means 80 is
Thickening material tank 50 and filling material tank 52, and snake pumps 56 and 5 for adding thickening material and filling material
8, pump control devices 72 and 74 for controlling the snake pumps 56 and 58, and a line mixer 54.

Specifically, the thickener tank 50 and the filling material tank 52 are placed on a rear carriage (not shown) behind the shield machine 34 in the tunnel 36 connected to the shield machine 34, A line mixer 54 is interposed in the mud pipe 44 at the position corresponding to the rear carriage on which the thickening material tank 50 and the filling material tank 52 are mounted, and the thickening agent is added to the line mixer 54 via snake pumps 56 and 58. The material tank 50 and the filling material tank 52 are in a connected state.

Further, the line mixer 54 and the shield machine 3
A viscometer 60 is provided in the mud pipe 44 between the snake pump 5 and the viscometer 60.
It is in a state of being connected to the pump control devices 72, 74 for 6, 58.

Further, the line mixer 54 and the shield machine 3
4 to the mud sending pipe 44 and the mud sending pipe 48.
4, 66 and density meters 68, 70 are provided, and these flow meters 64, 66 and density meters 68, 70 are used as the arithmetic unit 62.
Connected.

These flowmeters 64 and 66 and the density meter 6
Commercially available flowmeters and densitometers may be used as 8, 70, but for example, a dual-purpose type as shown in FIG. 10 may be used. The flow rate / densitometer shown in FIG. 10 includes an ultrasonic transmitter / receiver 110 which is arranged in the mud sending pipe 44 and the mud discharging pipe 48 so as to face each other at a predetermined angle θ with respect to the flow direction of the mud flowing in the pipe, The ultrasonic wave transmission / reception timing of the pair of ultrasonic wave transmitters / receivers 110 and the arithmetic unit 112 that calculates the flow rate and density of the muddy water flowing in the pipe based on the ultrasonic attenuation amount are provided. The flow rate and density of mud can be measured accurately in real time.

The viscometer 60 is supplied from the thickening material tank 50 and the filling material tank 52 into the mud pipe 44, and measures the viscosity of the mud mixed with the thickening material and the filling material by the line mixer 54. However, the viscosity data is sent to the arithmetic unit 62, and for example, those shown in FIGS. 4 and 5 to 7 can be adopted.

The viscometer shown in FIG. 4 relates to the application of the present applicant, and as shown in Japanese Patent Laid-Open No. 3-271495, the pressure of the muddy water flowing in the conduit of the mud pipe is at least 2. Pressure measuring devices 82a and 82b for measuring at a location and a viscosity calculating circuit 84 for calculating the viscosity of the muddy water based on the measured differential pressure of the muddy water are provided, and the viscosity calculating circuit 84 is provided between the pressure measuring devices 82a and 82b. The differential pressure calculation unit 88 calculates the differential pressure based on the memory 86 that stores data such as the distance and the inner diameter of the mud pipe, and sends the calculation result to the viscosity calculation unit 90.
The viscosity calculation unit 90 calculates and outputs the viscosity coefficient in real time based on the data in the memory 86, the differential pressure, the flow rate and the density by the flow rate / density meter 92, and the like. As described above, the viscosity of the muddy water supplied as the stabilizing solution can be automatically and in real time measured by the viscometer.

Further, the viscometer shown in FIGS. 5 to 7 is provided after the application of the invention disclosed in the above-mentioned Japanese Patent Laid-Open No. 3-271495.
Furthermore, when research and development were carried out on the viscosity measurement of mud, it was found that the method of obtaining the viscosity from the pressure difference of mud enables more accurate viscosity measurement by considering the flow velocity V of mud. Thought in.

That is, when the flow velocity of the muddy water flowing in the pipe does not change so much, the viscosity can be accurately measured only by the differential pressure of the muddy water. However, in recent years, rapid construction has been carried out in order to increase the work efficiency of the construction, and when such a construction method is adopted, the flow velocity of the muddy water flowing in the pipeline often changes remarkably. For example, when rapid construction is adopted at a mud pressure type shield site, the excavation speed changes greatly depending on the type of rock to be excavated, and the flow velocity of the mud flowing in the pipeline changes accordingly. . In such a case, the viscosity of the muddy water cannot be accurately measured without considering the change in the flow velocity V of the muddy water.

Therefore, in this embodiment, the relationship between the differential pressure Δh of the muddy water flowing in the pipeline and the flow velocity V is measured in advance with the viscosity as a parameter, and the differential pressure ΔH of the muddy water flowing in the pipeline is measured. , Data showing the correlation between the flow velocity V and the viscosity is prepared.

After that, the differential pressure Δh and the flow velocity V of the muddy water flowing in the pipe are actually measured, and the measured data and the correlation data obtained in advance are collated, regardless of the fluctuation of the muddy water velocity. , It becomes possible to accurately and automatically measure the viscosity.

Therefore, as shown in FIG. 5, the muddy water characteristic measuring system of the embodiment comprises a differential pressure measuring section 140, a flow velocity measuring section 150, a memory 174, and a viscosity calculating section 176.

The differential pressure measuring unit 140 includes at least two pressure measuring devices 142a and 142b and a differential pressure detecting unit 144.
It is comprised including. Each of the pressure measuring units 142a, 1
42b is a predetermined interval l (in the embodiment, l in the straight pipe portion of the conduit).
= 10 m), the pressures Pa and Pb of the muddy water at each installation position are measured and output to the differential pressure detection unit 144.

The differential pressure detection unit 144 obtains the differential pressure Δh between the measured pressures Pa and Pb thus input by the following equation and outputs it to the viscosity calculation unit 176. Δh = Pa−Pb The flow velocity measuring unit 150 is configured so that the pressure measuring device 142 a, 1
It is located near the installation of 42b and is attached to the pipeline. The flow velocity V of the muddy water flowing in the pipeline is measured and output to the viscosity calculation unit 176. The flow velocity measuring unit 150 may have various configurations as necessary, but in the present embodiment, it is disclosed in JP-A-3-27.
The same structure as that of the invention of No. 1495, which uses ultrasonic waves to measure the flow velocity, is used.

Correlation data is stored in the memory 174. That is, the differential pressure Δ of the muddy water flowing in the pipeline using the differential pressure measuring unit 140 and the flow velocity measuring unit 150.
Data representing the correlation between h, the flow velocity V, and the viscosity is actually measured in advance, and the correlation data obtained by the actual measurement is stored.

The details of the correlation data of the muddy water differential pressure Δh, the flow velocity V and the viscosity, which are stored in advance in the memory 174, will be described below.

In FIG. 6, the system of the embodiment is attached to the mud pipe at the pressurized mud shield site, and the flow velocity V and the differential pressure Δh of the mud flowing in the pipe are measured using the funnel viscosity FV as parameters. Values are shown. Here, the funnel viscosity is FV = 19.71 sec to FV = 31.88.
Velocity V is changed for 5 kinds of muddy water during sec,
The pressure difference Δh at that time is actually measured. In the figure, T is temperature.

As shown in the figure, FV = 19.71 sec
The characteristics of the muddy water of are approximated by a quadratic polynomial, FV = 21,
The characteristics of the muddy water from 98 sec to FV = 31.88 sec are
It is approximated by a linear expression. The substance of mud water with FV = 19.71 is water, and its characteristics are completely different from those of mud water with FV = 21.98 or more (solid particles suspended in liquid).
The flow of muddy water of FV = 21.98-31.88 sec is
It is clearly Hagen Poiseuille's flow. In such a Hagen-Poiseuille flow, pressure loss Δh
Is generated by the viscosity of muddy water. Also, FV = 19.
The pressure loss Δh of the 71 sec flow is considered to be mostly due to inertial force.

As is well known, the flow in the mud transport pipe is turbulent. Critical Reynolds number Re changing from laminar flow to turbulent flow
Is about 1100 to 1200 in mud. Therefore, using the well-known Darcy-Weisbach equation and Niclaise's equation, the flow velocity when mud changes from laminar flow to turbulent flow is obtained for each funnel viscosity mud as shown in Fig. 6. , The critical line Re is connected. It is considered that the flow in the pipe becomes laminar on the left side of this straight line, that is, the side where the flow velocity is low, and turbulent on the right side where the flow velocity is high.

Furthermore, in the case of mud with an FV of 21.98 sec or more, even if the flow velocity is increased to a certain flow velocity (the limit flow velocity) even in the turbulent region, even if the flow velocity V is increased, it can be expressed by a linear (linear) approximation formula. Relationships are maintained. The higher the viscosity is, the larger the critical flow velocity is. Therefore, for the mud of each funnel viscosity FV, the muddy water is in a flow velocity range that is equal to or higher than the flow velocity corresponding to the critical Reynolds number and is equal to or lower than the boundary flow velocity (critical flow velocity) where the approximate expression changes from the primary expression to the secondary expression. The flow velocity V and the differential pressure Δh are measured.

In FIG. 7, the relationship between the mud flow velocity V and the mud feed differential pressure Δh was measured for each mud of each funnel viscosity within the flow velocity range between the flow velocity corresponding to the critical Reynolds number and the critical flow velocity. Then, using this measurement data, it is a characteristic diagram showing the value of Δh / V on the horizontal axis and the funnel viscosity FV on the vertical axis. As shown in the figure, the ratio Δh / V of the differential pressure Δh of mud and the flow velocity V
And the funnel viscosity FV have a linear correlation. In the figure, the broken line indicates the range where the reliability is 95%.
In this embodiment, the approximate expression data of FIG. 7 thus obtained by actual measurement is stored in the memory 174 in advance.

Then, the viscosity calculating unit 176 calculates Δh / Δh based on the differential pressure Δh of the muddy water which is input in real time from the differential pressure measuring unit 140 and the flow velocity measuring unit 150 and the flow velocity V.
The value of V is calculated and the funnel viscosity FV corresponding to this value is calculated.
Is read from the data shown in FIG. 7 stored in the memory 174. The funnel viscosity FV thus obtained is output as mud water viscosity data.

By doing so, the system of this embodiment is not affected by fluctuations in the flow velocity of muddy water,
The viscosity can be accurately measured as the funnel viscosity.

The arithmetic unit 62 controls the pump control units 72 and 74 based on the face data obtained by detecting the condition of the face 46.

The cutting face data is composed of the cutting face water pressure by the water pressure gauge, the cutter torque by the torque detector, the cutter slit opening, and the soil tank discrimination data by the underground radar.
The cutting face data, the viscosity data from the viscometer 60, the flow rate and the density by the flow meters 64 and 66 and the densitometers 68 and 70 are calculated, and the amount of dry sand for excavation, the excavation deviation flow rate, the addition amount of thickening material and the addition of filling material Calculate the amount and pump controller 7
2, 74 to control the supply amounts of the thickening material and the filling material from the thickening material tank 50 and the filling material tank 52, and the viscosity of the mixed mud water that has passed through the line mixer 54. The viscosity data is calculated by and is fed back to the arithmetic unit 62.

As the underground radar for detecting the soil tank discrimination data, for example, one shown in FIG. 8 can be adopted.

The underground radar shown in FIG. 8 is provided with a transmitting antenna 96 and a receiving antenna 98 which are arranged at a predetermined interval on the cutter face 94 of the shield machine and which transmits and receives radio waves toward the front of the shield machine. Transmitting antenna 9
6, a radio wave is transmitted forward, and a surface propagation wave propagating near the surface of the face is received by the reception antenna 98. The propagation time of the surface propagation wave and the transmission antenna 96 and the reception antenna 9 are received.
By determining the difference in soil quality in front of the cutting face based on the interval between the eight, it is possible to obtain the difference in soil properties facing the face using the surface wave, and also to calculate the permittivity. Thus, the distance to the foreign matter that generates the reflected wave can be accurately obtained.

The arithmetic unit 62 also controls the face water pressure based on the amount of dry sand and the excavation deviation flow rate.

In this way, the mud water is adjusted in the middle of the mud sending pipe 44 at the rear bogie position of the shield machine 34, and the mud is sent to the face 46 as it is, so that the mud sending distance of the adjusted mud is greatly shortened. This makes it possible to quickly deal with face management.

For example, when the position of the rear bogie where the thickening material tank 50, the filling material tank 52, and the line mixer 54 are installed is 30 m from the face, the general mud flow rate is 2
In the case of m / sec, it becomes possible to send the adjusted mud to the face in about 15 seconds.

As compared with the case where muddy water is controlled on the ground or at the start shaft by adjusting the muddy water by the rear carriage of the shield machine 34, as shown in FIG. Water tank 2, adjusting tank 3,
It is enough to install the vibrating screen 4, the belt conveyor 5, 6, the filter press 7, the water purification tank 8, the PH control device 9, the PAC storage tank 10, the truck loading section 11, the excess mud water tank 12, the earth and sand hoppers 13, 14. Mud storage tank required for mud management, mud production tank, clay storage yard, CMC dissolution tank,
Equipment such as a CMC storage yard is unnecessary, and it is possible to reduce the installation area of the above-ground equipment and save the area.

In the past, an adjustment tank for mud stock of 10 minutes was usually required to prevent lost mud, etc. By doing so, it is not necessary to stock the adjusted muddy water, and therefore, the amount of the fresh water tank 2, the surplus muddy water tank 12, and the adjusting tank 3 combined can be considered as the stock amount, and the land area can be saved by reducing the muddy water tank. Area can be increased.

Considering, for example, a muddy water type shield having an excavation outer shape of 3280 mm and gravel: silt clay = 95: 5, the amount can be reduced from the adjusting tank of 50 m ^{3 to} the adjusting tank of 20 m ³ . Conventionally, it is 810
The place was m ² is required can be reduced to 450 m ^2, it becomes possible to achieve about 55% of the area saving.

Further, in addition to the above-described viscosity control, by controlling the mud pressure in the tunnel 36, the stable control of the face can be controlled more reliably and in real time.

As this muddy water pressure management device, for example,
As shown in FIG. 9, an introduction pipe 102 for branching muddy water from the mud transport pipe 44 is provided on the shield chamber 42 side of the extension pipe 100 of the mud transport pipe 44, and a predetermined amount of muddy water is tunneled by the introduction pipe 102. It is stored in the muddy water tank 104 inside and the pressure inside the muddy water tank 104 is adjusted by the pressure adjusting means 10.
By 6, the pressure is raised to and maintained at the specified level, and the mud tank 1
The muddy water in 04 is pressurized to a set pressure, and the pressurized muddy water is supplied into the shield chamber 42 by the supply pipe 108, so that the muddy water is supplied into the shield chamber in a short time to maintain the muddy water pressure. Even if the muddy water pressure in the shield chamber becomes high, it can be easily dealt with by backflowing the muddy water in the shield chamber.

Next, the control state using the face stability control device in the shield machine 34 will be described.

First, the face pressure data such as the face pressure, the cutter torque, the cutter slit opening, and the soil tank discriminating data are transferred from various detecting devices in the shield chamber 42 to the arithmetic unit 62.
Sent to.

The arithmetic unit 62 monitors the stability of the cutting face on the basis of the various cutting face data, and at the same time, the viscosity data detected by the viscometer 60, the flow meter 64 and the density meter 68 arranged in the mud pipe 44, The properties of the muddy water in the mud pipe 44 are determined from the data such as the flow rate and the density. Further, the degree of collapse or the like of the cutting face 46 is determined based on the data from the flowmeter 66 and the viscometer 70 arranged in the sludge pipe 48. Then, from these data, the computing device 62 calculates the amount of dry sand for excavation, the excavation deviation flow rate, and when loosening of the face is expected, the viscosity of mud and the amount of thickening agent necessary to obtain the value are calculated. Assuming the amount of plugging material required to prevent sludge loss, each addition amount control signal is transmitted to the pump control devices 72 and 74, and a signal is transmitted to the above-ground equipment to adjust the face water pressure. As the appropriate viscosity, for example, for a highly permeable gravel ground, a viscosity of at least 2 poise or more, preferably 4 poise or more is required.

The pump control units 72 and 74 are the arithmetic unit 6
In response to the control signal No. 2, the snake pumps 56 and 58 are controlled to supply the necessary amount of thickening material and the filling material from the thickening material tank 50 and the filling material tank 52 to the central portion of the mud feeding pipe 44. .

The thickening material and the filling material supplied to the mud sending pipe 44 utilize the energy of the mud sending flow in the mud sending pipe 44 by the line mixer 54 arranged in the middle of the mud sending pipe 44. Then, it is mixed with the sent water by stirring.

Then, the muddy water, which is agitated and mixed by the line mixer 54, is adjusted to the viscometer 60 of the mud pipe 44.
After passing through the flowmeter 64 and the densitometer 68, each of these instruments sends respective data to the arithmetic unit 62, the arithmetic unit 62 judges the adjustment status, and feeds the adjusted mud into the shield chamber while performing feedback control. The face 46 is made stable.

As described above, the muddy water is managed on the rear bogie behind the shield machine 34, and the adjusted mud is supplied from the rear bogie position to the cutting face 46, so that it is possible to quickly respond to the change in stability of the cutting face. As in the conventional case, it is possible to prevent the face from loosening, collapsing, and causing mud due to the delay in response before the adjustment mud is supplied.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the gist of the present invention.

For example, in the above-mentioned embodiment, the case where the thickening material tank, the filling material tank, and the like are arranged on the rear carriage 30 m behind the shield machine has been described, but the present invention is not limited to this example. By arranging it closer to the shield machine side, it becomes possible to more quickly respond to changes in the stability of the face.

Further, the viscometer and the ground-penetrating radar are not limited to those shown in the above-mentioned embodiment, and various kinds can be adopted.

[0079]

As described above, according to the first aspect of the present invention, the thickener is directly supplied to the mud flowing in the mud pipe in the middle of the mud pipe to adjust the viscosity of the mud to the face. By supplying it, the distance from the muddy water adjusting equipment to the face can be shortened, and as a result, the time from detecting the change in the stability of the face using the face data to sending the adjusted muddy water to the face is shortened. The effect is that it can be greatly shortened and the face management can be quickly handled.

Further, since the adjustment of mud water is also performed by directly supplying the thickening agent into the mud pipe, the adjustment time of mud water can be shortened and the corresponding time can be shortened. effective.

Therefore, there is an effect that it is possible to surely prevent loosening or collapse of the cutting face due to a delay in handling before the adjustment mud is supplied to the cutting face after the change in the stability of the cutting face is detected as in the conventional case. .

Further, since mud water is adjusted by directly supplying the thickener into the mud pipe, the mud storage tank, mud tank, clay storage yard, CMC dissolution tank, CMC are provided on the ground or at the starting shaft.
There is no need to install muddy water management equipment such as a storage yard, and the area required to install this muddy water management equipment is no longer necessary, and it is possible to greatly reduce the required area for aboveground equipment and save area. Even if it is difficult to secure a vast land area for above-ground equipment such as a part, it is possible to enable construction.

According to the second aspect of the present invention, the soil layer discriminating device detects the soil layer discriminating data, the arithmetic unit calculates the amount of the filling material added based on the soil layer discriminating data, and the additive material supplying means is used. By supplying the filling material into the mud pipe, it is possible to adjust the mud water to the optimum state according to the condition of the soil layer of the face. Moreover, since the filling material is supplied directly into the mud pipe, the gravel layer There is an effect that it is possible to promptly deal with the lost mud and the collapse of the face during excavation.

According to the third aspect of the invention, mud preparation is facilitated by determining the properties of the mud sending water by the arithmetic unit from the viscosity and the flow rate of the mud sending water measured by the viscometer and the flow meter provided in the mud sending pipe. There is an effect that can be done.

According to the fourth aspect of the invention, the viscometer and the flowmeter are provided in front of the additive material supplying means, and the arithmetic unit determines the adjustment status based on the information from each instrument, and the additive material supplying means By performing the feedback control, it is possible to perform more accurate mud adjustment according to the situation of the face.

According to the fifth aspect of the present invention, the mud pipe is provided with a density meter, the mud pipe is provided with a flow meter and a density meter, and the arithmetic unit calculates the flow rate and density of the mud water from the respective data of the face collapse and deviation. By judging the degree of mud, there is an effect that the situation of the cutting face can be grasped more accurately and the stable management of the cutting face can be made more reliable.

According to the sixth aspect of the invention, the thickener tank, the filling material tank, the thickening material addition pump, the filling material addition pump,
By configuring the additive material supply means with the thickener additive pump controller, the clogging material additive pump controller and the line mixer, each additive pump controller controls each additive pump to obtain an accurate amount from each tank. The thickening material and the filling material can be supplied into the mud pipe, the mud water can be adjusted accurately and in a short time, and the face can be managed in an optimum state in real time.

Further, the thickening material and the filling material supplied into the mud feeding pipe by the line mixer can be stirred and mixed with the mud water by utilizing the energy of the mud flow, and the mechanism for stirring and mixing is simplified. There is an effect that it can be miniaturized by downsizing.

[0089]

[Brief description of drawings]

FIG. 1 is an overall schematic view showing a face stabilizing method of a muddy water shield method according to an embodiment of the present invention.

FIG. 2 is a schematic view showing an enlarged main part in the face stabilizing method of the muddy water shield method of FIG.

FIG. 3 is a plan view showing an arrangement state of ground equipment in the present embodiment in comparison with FIG. 9.

FIG. 4 is a block diagram showing an example of a viscometer.

FIG. 5 is a block diagram showing another example of a viscometer.

FIG. 6 is a characteristic diagram when the flow velocity and the differential pressure of muddy water are measured using the funnel viscosity as a parameter.

FIG. 7 is a characteristic diagram showing the ratio of the differential pressure and flow velocity of mud water on the horizontal axis and the funnel viscosity on the vertical axis.

FIG. 8 is a front view showing an example of an underground radar.

FIG. 9 is an explanatory diagram showing an example of a muddy water pressure management device.

FIG. 10 shows a flow rate / densitometer of mud sending water (A)
Is a sectional view in the axial direction of the mud pipe, and (B) is a sectional view in a direction intersecting the axial direction.

FIG. 11 is a plan view showing a state of ground equipment in a conventional muddy water shield method.

[Explanation of symbols]

 34 shield machine 42 shield chamber 44 mud pipe 46 face 50 thickening material tank 52 filling material tank 54 line mixer 60 viscometer 62 arithmetic unit 64 flow meter 68 density meter 80 additive material supply means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Yamashita 1-22-8 Nishi-Ikebukuro, Toshima-ku, Tokyo Inside the Sewerage New Technology Promotion Organization (72) Inventor Yoshio Iwai 1-7, Kyobashi, Chuo-ku, Tokyo No. 1 in Toda Construction Co., Ltd. (72) Inventor Sadao Noguchi 1-7-1 Kyobashi, Chuo-ku, Tokyo Within Toda Construction Co., Ltd. (72) Inoue Saito 1-7-1 Kyobashi, Chuo-ku, Tokyo No. Toda Construction Co., Ltd. (72) Inventor Yasutomo Katori 1-17-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Iku Sato 1-1-7 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd.

Claims (6)

[Claims] 1. In a muddy water type shield machine for supplying muddy water to a shield chamber via a mud pipe and discharging muddy water in the shield chamber via a mud pipe, the mud pipe is provided in the mud pipe and flows through the mud pipe. A viscometer for measuring the viscosity of the muddy water, a computing device for calculating the addition amount of the thickener by comparing the viscosity of the muddy water measured by the viscometer with the face data of the cutting face detected by the face data detecting means, and A face stabilization control device in a muddy water shield machine, comprising: an additive supply means for supplying the thickener into the mud pipe based on the addition amount of the thickener obtained by a computing device. 2. The face data detection means according to claim 1, further comprising a soil layer discriminating device for detecting soil layer discriminating data, and the arithmetic unit calculates the amount of filling material to be added based on the soil layer discriminating data. Then, the additive material supply means supplies the packing material into the mud pipe in addition to the thickening material on the basis of the addition amount of the packing material, wherein the face stabilizing control device in the muddy water shield machine is characterized. 3. The mud type according to claim 1, wherein a flow meter is provided in the mud sending pipe, and the arithmetic unit determines the property of the mud sending water from each data of viscosity and flow rate of the mud sending water. Face stabilization control device for shield machine. 4. The viscometer, the flowmeter, and the densitometer according to claim 3, wherein the viscometer, the flowmeter, and the densitometer are provided in front of the additive material supply means, and the arithmetic unit determines the adjustment status based on information from the respective meters. A face stabilization control device in a muddy water shield machine, characterized in that feedback control of the additive supply means is performed. 5. The flowmeter and the density meter according to claim 1, wherein the sludge pipe is provided with a flow meter and a density meter, and the arithmetic unit determines the degree of face collapse and sludge loss from each data of the flow rate and density of the sludge water. A stable face control device for a muddy water shield machine. 6. The additive material supply means according to claim 2, wherein the thickener material tank and the filler material tank contain the thickener material and the filler material respectively, and the thickener material and the filler material from each tank. A thickening material addition pump and a filling material addition pump which are supplied into the mud pipe, and a thickening material and a filling material by the thickening material addition pump and the filling material addition pump based on an addition amount control signal from the arithmetic unit. Thickener addition pump control device and filler control pump control device that controls the amount of filler added, and a line that stirs and mixes the thickener and filler supplied in the mud pipe using the mud flow. A face stabilization control device for a muddy water type shield machine, comprising: a mixer.