JP3131552B2 - Face stability control device for muddy shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a face stabilization control device for a muddy shield machine, and more particularly to a face stabilization control device for a muddy shield machine which achieves quick response of face management and reduces the area of ground equipment.

[0002]

2. Description of the Related Art As is well known, in a muddy water shield machine, the earth and sand which has been cut off by a cutter at the front of the shield machine and taken into a shield chamber are stirred with muddy water supplied through a mud pipe, and the sludge is discharged. It is discharged to the outside through a pipe.

In such a muddy shield machine, a shield chamber between a partition wall and a face is filled with pressurized muddy water to stabilize the facet, and the excavated earth and sand is taken into muddy water to be discharged as ground muddy water. The fluid is transported to a muddy water treatment facility, the sediment is classified by the muddy water treatment facility, the mud is adjusted to a predetermined property, and the muddy water is circulated again as muddy water.

As described above, when performing stable control of the cutting face on the ground, for example, as shown in FIG. 11, in the ground equipment, a segment stock yard 1, a fresh water tank 2, an adjusting tank 3, a vibration sieve 4, a belt conveyor 5 , 6, filter press 7, water purification tank 8, PH control device 9, PAC storage tank 10, truck carry-in unit 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, a CMC storage yard 19 and the like are provided.

[0005] In addition to the case where the muddy water treatment facility is provided on the ground and the stable control of the face is performed on the ground as described above, the case where the muddy water management equipment is provided in the start pit and the stable control of the face is performed in the start pit. there were.

[0006]

However, the conventional muddy water shield machine has the following problems.

First, as in the prior art, when the muddy water is adjusted on the ground or in a starting shaft and then sent to the face, the muddy water is adjusted according to the change in the stability of the face after confirming the change in the stability of the face. 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 adjusting the mud, the adjusted mud does not reach the face. It takes a considerable amount of time, and it may lead to loosening or collapse of the face between the time when the adjusted muddy water reaches the face after detecting the change in the stability of the face, and prompt response to face management 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, even if muddy water is sent immediately after adjusting the muddy water in accordance with the change in the stability of the face, the muddy flow velocity is generally 2 m / m2.
Since it is sec, it takes about 8 minutes for the adjusted muddy water to reach the face, and the response to the time of 8 minutes or more is delayed after detecting a change in the stability of the face.

Further, as in the conventional case, when muddy water is managed on the ground or in a starting shaft, the mud making storage tank 15, the mud making tank 16,
Muddy water management facilities such as a clay storage yard 17, a CMC dissolution tank 18, a CMC storage yard 19, and the like are required. For these muddy water management facilities, a vast area is required as ground equipment, or muddy water management in a starting shaft. When the equipment is provided, there is a problem that a large shaft is required, and the required area of the ground equipment is accordingly increased.

[0009] Particularly in urban areas, it is becoming difficult to secure a vast land area for ground facilities, and thus it is difficult to secure sufficient land for ground facilities. If not, there is a problem that it is becoming difficult to excavate the tunnel.

For example, when a new water and sewage tunnel is to be excavated in place of an aging water and sewage system, when excavating an old tunnel, there are parks and vacant lots.
The ground equipment was installed and constructed there, but now the environment changes and parks and vacant lots may not be available as work space, so it is not possible to secure a large land area for ground equipment Such a case occurs.

Further, in the conventional muddy water shield construction method, an adjustment tank 3 for storing muddy water with a mud amount of about 10 minutes is required as a countermeasure against lost mud and the like.
Moreover, since the muddy water is adjusted in the adjusting tank 3, all the stock is covered by the adjusting tank 3, so that the adjusting tank 3 is large and the land area for the ground equipment is correspondingly large. was there.

The present invention has been made in view of the above-mentioned conventional problems, and its object is to enable quick response to face management and to reduce the amount of muddy water stock for muddy water management equipment and sludge countermeasures. Accordingly, it is an object of the present invention to provide a face stabilizing control device for a muddy shield machine capable of reducing the land area for ground equipment and saving the area.

[0013]

According to a first aspect of the present invention, there is provided a muddy water supply system for supplying muddy water to a shield chamber via a mud pipe and discharging mud in the shield chamber via a mud discharge pipe. In the shield machine, a viscometer that is provided in the mud pipe and measures the viscosity of the mud flowing in the mud pipe, the face data in which the face condition is detected by the face data detecting means, and the viscosity of the mud measured by the viscometer. An arithmetic unit for comparing and adding an amount of the thickener, and an additive supply unit for supplying the thickener into a mud pipe based on the amount of the thickener obtained by the arithmetic unit, It is characterized by.

[0014] 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 is clogged based on the soil layer discriminating data. Calculate the material addition amount, the additive material supply means,
The plugging material is supplied into the mud pipe in addition to the thickening material based on the plugging material addition amount.

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

In a fourth aspect based on the third aspect, the viscometer, the flow meter, and the density meter are provided at a position in front of the additive supply means, and the arithmetic unit operates based on information from the instruments. It is characterized in that the adjustment state is determined and feedback control of the additive supply means is performed.

According to a fifth aspect of the present invention, in the first or third aspect, a flow meter and a density meter are provided on the sludge pipe,
The arithmetic unit is characterized by determining the degree of face collapse and lost sludge from the data on the flow rate and density of the wastewater.

In a sixth aspect based on the second aspect, the additive supply means comprises a thickener tank and a plugging material tank for accommodating the thickener and the plugging material, respectively. And a thickening agent addition pump and a filling material addition pump for supplying a filling material into the mud pipe, and the thickening material addition pump and the filling material addition pump based on an addition amount control signal from the arithmetic unit. A thickening material addition pump control device and a filling 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 pipe using a mud flow. And a line mixer for stirring and mixing.

[0019]

According to the first aspect of the present invention, the face data in which the face condition is detected by the face data detecting means is transmitted to the arithmetic unit, and the inside of the mud pipe is transmitted by the viscometer provided in the mud pipe. The viscosity of the flowing mud is measured and transmitted to the arithmetic unit. The arithmetic unit compares the face data with the viscosity of the muddy water to determine the amount of the thickener to be added, and transmits the thickener to the additive supply means. In the additive supply means, the thickener is supplied into the mud pipe based on the addition amount of the thickener transmitted from the arithmetic unit.

As described above, the thickener is supplied directly to the mud flowing in the mud pipe in the middle of the mud pipe, and the viscosity of the mud is adjusted and supplied to the face, so that the mud water adjusting equipment to the face can be adjusted. The distance between detecting the change in the stability of the face from the face data and sending the adjusted muddy water to the face can be greatly reduced. Can respond. Further, since the muddy water is also adjusted by directly supplying the thickener into the mud feed pipe, the muddy water adjusting time can be shortened, and the response time can be shortened accordingly.

Therefore, it is possible to reliably prevent the face from being loosened or collapsed due to a corresponding delay between the time when the change in the face stability is detected as in the prior art and the time when the adjusted muddy water is supplied to the face.

Further, since muddy water is adjusted by directly supplying a thickening agent into a mud pipe, a mud storage tank, a mud storage tank, a clay storage yard, a CMC dissolution tank,
There is no need to install muddy water management facilities such as storage yards, and the area required for the installation of this muddy water management equipment is not required, and the required area for ground facilities can be greatly reduced, and the area can be reduced. Even when it is difficult to secure a vast land area for ground equipment, such as a part, construction can be performed.

According to the second invention, the soil layer discrimination data is detected by the soil layer discrimination device, and the arithmetic device calculates the amount of plugging material addition based on the soil layer discrimination data. By supplying the plugging material in the mud pipe by
The muddy water can be adjusted to the optimum condition according to the conditions of the soil layer of the face, and the plugging material is supplied directly into the mud pipe. And can respond quickly.

According to the third aspect of the present invention, the muddy water can be easily prepared by judging the properties of the muddy water by an arithmetic unit from the viscosity and the flow rate of the muddy water measured by a viscometer and a flow meter provided in the mud pipe. Can be

According to the fourth aspect of the invention, the viscometer and the flow meter are provided in front of the additive supply means, and the adjustment state is determined by the arithmetic unit based on information from each instrument. By performing the feedback control described above, it is possible to perform more accurate mud conditioning according to the situation of the face.

According to a fifth aspect of the present invention, a density meter is provided in a mud feeding pipe, and a flow meter and a density meter are provided in a mud discharging pipe.
By judging the degree of face collapse and lost sludge from the data on the flow rate and density of the muddy water by the arithmetic unit, the situation of the face can be grasped more accurately, and the stable management of the face can be further ensured.

According to a sixth aspect of the present invention, there is provided a thickening material tank, a filling material tank, a thickening material adding pump, a filling material adding pump, a thickening material adding pump control device, a filling material adding pump controlling device, By configuring the additive supply means in the line mixer, each additive pump control unit controls each additive pump to supply the correct amount of thickener and plugging material from each tank into the mud pipe. It is possible to adjust muddy water accurately and in a short time, and to perform face management in an optimal state in real time.

Further, the thickener and the plugging material supplied into the mud pipe by the line mixer can be stirred and mixed with the muddy water by utilizing the energy of the mud flow, thereby simplifying the mechanism for stirring and mixing. The size can be reduced.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 to FIG. 10 are views showing a face stabilizing control device for a muddy water shield machine according to one 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 the starting shaft 32 is excavated laterally in the ground from a bottom portion thereof to reduce a segment. Tunnel 3 while assembling
6 is being constructed.

This shield machine 34 is of a muddy water type,
Muddy water is supplied from the ground through a mud pipe 44 into a shield chamber 42 between the shield machine body 38 and the cutter disc 40, and the inside of the shield chamber 42 is filled with pressurized muddy water to stabilize the face 46. At the same time, the excavated sediment is taken into the muddy water, and as muddy water, the fluid is transported to the ground through the mud pipe 48, and the sediment is classified on the ground.
The mud is adjusted to a predetermined property, and is again circulated and used as muddy water.

In this embodiment, in order to stabilize the face, the face stabilizing control device 20 for managing muddy water in the tunnel 36 is employed.

The face stabilization control device 20 controls the stability of the face 46 by controlling the viscosity of muddy water in the middle of the mud pipe 44 in the tunnel 36 at the position behind the shield machine 34. 60, an arithmetic unit 62,
And an additive supply means 80.
Thickener tank 50 and plugging material tank 52, and snake pumps 56, 5
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 bogie (not shown) behind the shield machine 34 in a tunnel 36 connected to the shield machine 34, A line mixer 54 is interposed in the mud feed pipe 44 at a position corresponding to the rear bogie on which the thickener tank 50 and the filling material tank 52 are placed. The line mixer 54 is thickened via snake pumps 56 and 58. The material tank 50 and the filling material tank 52 are in a connected state.

The line mixer 54 and the shield machine 3
A viscometer 60 is disposed in the mud feeding pipe 44 between the snake pump 5 and the snake pump 5 via an arithmetic unit 62.
6 and 58 are connected to the pump control devices 72 and 74.

The line mixer 54 and the shield machine 3
4 and a flow meter 6
4 and 66 and density meters 68 and 70 are provided, and the flow meters 64 and 66 and the density meters 68 and 70 are
Connected.

The flow meters 64 and 66 and the density meter 6
A commercially available flow meter and density meter can be used as 8, 70. For example, a dual-purpose type as shown in FIG. 10 can be used. The flow rate / density meter shown in FIG. 10 includes an ultrasonic transmitter / receiver 110 which is disposed opposite to the mud feed pipe 44 and the mud discharge pipe 48 so as to intersect at a predetermined angle θ with respect to the flow direction of the mud flowing through the pipes, A calculation unit 112 for calculating the flow rate and density of the muddy water flowing in the pipe based on the ultrasonic transmission / reception timing and the ultrasonic attenuation amount of the pair of ultrasonic transmitter / receivers 110. The mud flow and density can be accurately measured in real time.

The viscometer 60 measures the viscosity of the muddy water supplied from the thickener tank 50 and the plugging material tank 52 into the mud pipe 44 and mixed with the thickener and the plugging material by the line mixer 54. Then, the viscosity data is sent to the arithmetic unit 62. For example, the viscosity data shown in FIGS. 4 and 5 to 7 can be adopted.

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

The viscometer shown in FIGS. 5 to 7 has been disclosed in Japanese Patent Application Laid-Open No. Hei 3-271495.
Further research and development on the viscosity measurement of muddy water revealed that it was possible to measure viscosity more accurately by considering the flow velocity V of muddy water by the method of obtaining the viscosity from the pressure difference of the muddy water. Was thought.

That is, when the flow rate of the mud flowing through the pipeline does not change so much, the viscosity of the mud can be accurately measured only by the differential pressure of the mud. However, in recent years, rapid construction has been performed 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 pressurized shield site, the excavation speed varies greatly depending on the type of ground to be excavated, and the flow velocity of the mud flowing through the pipeline also varies greatly according to this. . In such a case, the viscosity of the mud cannot be accurately measured unless the change in the flow velocity V of the mud is also taken into consideration.

For this reason, in the present 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 using the viscosity as a parameter, and the differential pressure ΔH of the muddy fluid flowing in the pipeline is measured. , Data representing the correlation between flow rate V and viscosity.

Thereafter, the differential pressure Δh and the flow velocity V of the mud flowing in the pipeline are actually measured, and the measured data and the correlation data obtained in advance are compared with each other, regardless of the fluctuation of the flow velocity of the mud. , The viscosity can be automatically measured accurately.

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

The differential pressure measuring section 140 includes at least two pressure measuring devices 142 a and 142 b and a differential pressure detecting section 144.
It is comprised including. Each of the pressure measuring units 142a, 142
42b is a predetermined distance l (in the embodiment, l)
= 10m), and measures the pressure Pa, Pb of the muddy water at each installation position and outputs the measured pressure to the differential pressure detection unit 144.

The differential pressure detecting section 144 obtains the differential pressure Δh of each of the measured pressures Pa and Pb input as described above from the following equation, and outputs it to the viscosity calculating section 176. Δh = Pa−Pb The flow rate measuring unit 150 is provided with the pressure measuring devices 142a, 142
It is located near the installation of 42b and is attached to the pipeline, measures the flow velocity V of the muddy water flowing in the pipeline and outputs it to the viscosity calculation unit 176. The flow velocity measuring unit 150 may have various configurations as needed.
A configuration similar to that of the invention according to No. 1495, which measures the flow velocity using ultrasonic waves, is used.

The memory 174 stores correlation data. That is, the differential pressure of the muddy water flowing in the pipeline using the differential pressure measurement unit 140 and the flow velocity measurement unit 150
The 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.

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

In FIG. 6, the system of the embodiment is mounted on a mud feed pipe at a 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.
For 5 types of muddy water during sec, change the flow velocity V,
The differential pressure Δh at that time is actually measured. In the figure, T is a temperature.

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

As is well known, the flow in the mud transport pipe is turbulent. Critical Reynolds number Re changing from laminar to turbulent
In a slurry, Re = 1100-1200. Therefore, using the well-known Darcy-Wisebach equation and the Niklaze equation, the flow velocity when the slurry changes from laminar flow to turbulent flow is obtained for each funnel viscosity slurry as shown in FIG. , And critical Re. The flow in the pipe is considered to be laminar on the left side of this straight line, that is, on the side with the lower flow velocity, and turbulent on the right side with the higher flow velocity.

Further, in the case of a fluid having an FV of 21.98 sec or more, even in a turbulent flow region, until the flow velocity reaches a certain flow velocity (limit flow velocity), even if the flow velocity V is increased, a good linear (linear) approximation can be obtained. Relationship is maintained. The higher the viscosity is, the larger the critical flow velocity is. Therefore, for the slurry having each funnel viscosity FV, the muddy water has a flow velocity range not less than the flow velocity corresponding to the critical Reynolds number and not more than the flow velocity (critical flow velocity) at the boundary where the approximate expression changes from the primary expression to the secondary expression. The flow velocity V and the differential pressure Δh are measured.

FIG. 7 shows the relationship between the flow velocity V of the muddy water and the pressure difference Δh of the mud feeding for each muddy water of each funnel viscosity within the flow velocity range between the flow velocity corresponding to the critical Reynolds number and the critical flow velocity. FIG. 4 is a characteristic diagram using the measurement data, where the value of Δh / V is plotted on the horizontal axis and the funnel viscosity FV is plotted on the vertical axis. As shown in the figure, the ratio Δh / V between the differential pressure Δh of the muddy water and the flow velocity V
Has a linear correlation with the funnel viscosity FV. In the figure, the broken line indicates a range where the reliability is 95%.
In this embodiment, the approximate expression data of FIG. 7 obtained by actual measurement in this way is stored in the memory 174 in advance.

The viscosity calculating section 176 calculates Δh / Δh / m based on the differential pressure Δh of the muddy water input from the differential pressure measuring section 140 and the flow velocity measuring section 150 in real time 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. The funnel viscosity FV obtained in this way is output as viscosity data of muddy water.

By doing so, in the system of the present embodiment, without being affected by the fluctuation of the flow rate of the muddy water,
The viscosity can be accurately measured as a funnel viscosity.

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

The face data comprises face water pressure by a water pressure gauge, cutter torque by a torque detector, cutter slit opening, earth tank discrimination data by an underground radar, and the like.
The face data and the viscosity data from the viscometer 60, and the flow rates and densities by the flow meters 64 and 66 and the density meters 68 and 70 are calculated, and the excavation dry sand amount, the excavation deviation flow rate, the thickener addition amount and the plugging material addition The amount is calculated and the pump control device 7
2, 74 to control the supply amounts of the thickener and the plugging material from the thickener tank 50 and the plugging material tank 52, and furthermore, the mixed muddy water passed through the line mixer 54 is supplied to the viscometer 60. Calculates the viscosity data, and feeds it back to the arithmetic unit 62.

As an underground radar for detecting earth tank discrimination data, for example, the one shown in FIG. 8 can be employed.

The underground radar shown in FIG. 8 is disposed at a predetermined interval on the cutter face 94 of the shield machine, and includes a transmission antenna 96 and a reception antenna 98 for transmitting and receiving radio waves toward the front of the shield machine. Transmission antenna 9
6 transmits a radio wave forward, receives a surface propagation wave propagating in the vicinity of the surface of the face by the reception antenna 98, and transmits the propagation time of the surface propagation wave to the transmission antenna 96 and the reception antenna 9.
By determining the difference in soil quality in front of the face based on the interval between the eight, the difference in soil texture facing the face can be obtained using surface propagation waves, and also by calculating the dielectric constant. 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 excavated dry sand and the excavation deviation flow rate.

As described above, the muddy water is adjusted in the middle of the muddy feeding pipe 44 at the position of the bogie behind the shield machine 34, and the muddy water is fed to the face 46 as it is, thereby greatly shortening the muddy feeding distance of the adjusted muddy water. And quick response to face management becomes possible.

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

By adjusting the muddy water with the bogie behind the shield machine 34, as compared with the case where muddy water is managed on the ground or at the starting shaft, as shown in FIG. Water tank 2, adjustment tank 3,
Vibrating sieve 4, belt conveyor 5, 6, filter press 7, water purification tank 8, PH control device 9, PAC storage tank 10, truck carry-in section 11, excess mud water tank 12, earth and sand hoppers 13, 14 are sufficient. Mud storage tank, mud storage tank, clay storage yard, CMC dissolution tank,
Equipment such as a CMC storage yard becomes unnecessary, and the installation area of the ground equipment can be reduced accordingly, and the area can be saved.

Further, conventionally, an adjustment tank for storing the muddy water with a feeding amount of mud for 10 minutes is normally required for countermeasures against lost mud and the like, but the viscosity management of the muddy water is performed by the rear bogie as described above. By doing so, it is not necessary to stock the adjusted muddy water. Therefore, the combined amount of the fresh water tank 2, the surplus muddy water tank 12, and the adjusting tank 3 may be considered as the stock amount, and the land area can be saved by reducing the muddy water tank. The area can be increased.

For example, in the case of a muddy shield with an excavation outer shape of 3280 mm, when the gravel: silt clay is 95: 5, it is possible to reduce the amount from a 50 m ³ adjusting tank to a 20 m ³ adjusting tank. From the ground equipment perspective, 810
m ² can be reduced to 450 m ² , and the area can be reduced by about 55%.

In addition to the viscosity control described above, by controlling the muddy water pressure in the tunnel 36, it is possible to control the stable management of the face more reliably and in real time.

As the mud pressure management device, for example,
As shown in FIG. 9, an introduction pipe 102 is provided on the shield chamber 42 side of the extension pipe 100 of the mud feed pipe 44 to branch muddy water from the mud feed pipe 44. Is stored in a mud tank 104 inside the tank, and the air pressure in the mud tank 104 is
6, the pressure is maintained at a predetermined level, and the muddy water tank 1
The mud in the chamber 04 is pressurized to a set pressure, and the pressurized mud is supplied into the shield chamber 42 through the supply pipe 108, thereby supplying the mud in the shield chamber in a short time and maintaining the mud pressure. In addition, when the muddy water pressure in the shield chamber is increased, the muddy water in the shield chamber can be easily countered by flowing the muddy water in the shield chamber backward.

Next, a control state of the shield machine 34 using the face stabilization control device will be described.

First, face data, such as face water pressure, cutter torque, cutter slit opening, earth tank discrimination data, etc., are sent from various detection devices in the shield chamber 42 to the arithmetic unit 62.
Sent to.

The arithmetic unit 62 monitors the stability of the face based on the various face data, and also monitors the viscosity data detected by the viscometer 60, the flow meter 64 and the density meter 68 provided in the mud pipe 44. The properties of the muddy water in the mud feed pipe 44 are determined from data such as the flow rate and the density. Further, the degree of collapse of the face 46 is determined based on data from the flow meter 66 and the viscometer 70 provided in the exhaust pipe 48. From these data, the arithmetic unit 62 calculates the amount of excavated dry sand and the excavated deviation flow rate. When loosening of the face is expected, the viscosity of the muddy water and the amount of thickener necessary to obtain the value are calculated. Assuming the amount of plugging material necessary for preventing sludge loss, the respective addition amount control signals are transmitted to the pump controllers 72 and 74, and a signal is transmitted to the ground equipment to adjust the face water pressure. The appropriate viscosity is, for example, at least 2 poise or more, desirably 4 poise or more for a permeable ground.

The pump control units 72 and 74 are
In response to the control signal of 2, the snake pumps 56 and 58 are controlled to supply the required amount of the thickener and the plugging material from the thickener tank 50 and the plugging material tank 52 to the center of the mud pipe 44. .

The thickener and the plugging material supplied into the mud pipe 44 are used by the line mixer 54 provided in the middle of the mud pipe 44 by utilizing the energy of the mud flow in the mud pipe 44. Then, it is mixed with the muddy water by stirring.

The muddy water which has been stirred and mixed by the line mixer 54 and adjusted is supplied to the viscometer 60,
After passing through the flow meter 64 and the density meter 68, each of these meters transmits each data to the arithmetic unit 62, judges the adjustment status by the arithmetic unit 62, and supplies the adjusted muddy water into the shield chamber while performing the feedback control. As a result, the face 46 is stabilized.

As described above, the muddy water is managed on the rear bogie behind the shield machine 34, and the adjusted muddy water is supplied from the rear bogie position to the face 46, whereby a quick response to a change in the stability of the face becomes possible. As in the related art, it is possible to prevent the face from loosening, collapsing, or generating lost mud before the supply of the adjusted muddy water due to a delay in response.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

For example, in the above embodiment, the case where the thickener tank and the plugging material tank are arranged on the rear bogie 30 m behind the shield machine has been described. However, the present invention is not limited to this example. By arranging it closer to the shield machine side, it is possible to respond more quickly to changes in the stability of the face.

Further, the viscometer and the underground radar are not limited to those shown in the above-mentioned embodiments, and various types 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, and the viscosity of the mud is adjusted to adjust the viscosity of the mud. By supplying, the distance from the muddy water adjustment equipment to the face can be shortened.As a result, the time from when the change in the stability of the face is detected by the face data to when the adjusted muddy water is sent to the face is reduced. There is an effect that the time can be greatly reduced, and a quick response to face management can be performed.

Further, since the muddy water is adjusted by directly supplying the thickening agent into the mud feed pipe, the muddy water adjustment time can be shortened, and the response time can be shortened accordingly. effective.

Accordingly, there is an effect that the loosening or collapse of the face due to a delay in response can be surely prevented until the adjusted muddy water is supplied to the face after detecting the change in the face stability as in the related art. .

Further, since the muddy water is adjusted by directly supplying the thickener into the mud feed pipe, a mud storage tank, a mud storage tank, a clay storage yard, a CMC melting tank,
There is no need to install muddy water management facilities such as storage yards, and the area required for the installation of this muddy water management equipment is not required, and the required area for ground facilities can be greatly reduced, and the area can be reduced. Even if it is difficult to secure a vast land area for ground equipment, such as a part, there is an effect that construction can be performed.

According to the second aspect of the present invention, the soil layer discrimination data is detected by the soil layer discrimination device, and the arithmetic unit calculates the amount of plugging material to be added based on the soil layer discrimination data. By supplying the plugging material into the mud pipe, the muddy water can be adjusted to the optimum state according to the condition of the soil layer on the face, and the gravel layer is directly supplied to the mud pipe. This has the effect that it is possible to quickly respond to the loss of sludge or the collapse of the face during excavation.

According to the third aspect of the present invention, the condition of the muddy water is determined by the arithmetic unit from the viscosity and the flow rate of the muddy water measured by the viscometer and the flow meter provided in the mud pipe, thereby facilitating the preparation of the mud. There is an effect that can be.

According to the fourth aspect of the present invention, the viscometer and the flow meter are provided at a position in front of the additive supply means, and the arithmetic unit determines the adjustment state based on information from each instrument, and determines whether the additive supply means has been adjusted. By performing the feedback control, there is an effect that more accurate mud adjustment according to the situation of the face can be performed.

According to the fifth aspect of the present invention, a density meter is provided in the mud feeding pipe, and a flow meter and a density meter are provided in the mud drain pipe. By judging the degree of mud, there is an effect that the situation of the face can be grasped more accurately, and the stable management of the face can be more reliably performed.

According to the sixth invention, a thickener tank, a filling material tank, a thickener adding pump, a filling material adding pump,
By configuring the additive supply means with the thickener addition pump control device, the filling material addition pump control device, and the line mixer, each addition pump control device controls each addition pump, and the exact amount from each tank The thickening material and the plugging material can be supplied into the mud pipe, and the muddy water can be adjusted accurately and in a short time, so that the face management in an optimum state can be performed in real time.

Also, the thickener and the plugging material supplied into the mud pipe by the line mixer can be stirred and mixed with the muddy water by utilizing the energy of the mud flow, thereby simplifying the mechanism for stirring and mixing. Thus, there is an effect that the size can be reduced.

[0089]

[Brief description of the 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 an enlarged schematic view showing a main part in a face stabilization method of the muddy water shield method shown in FIG.

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

FIG. 4 is a block diagram illustrating 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 rate and differential pressure of the muddy water are measured using the funnel viscosity as a parameter.

FIG. 7 is a characteristic diagram of muddy water with the ratio of the differential pressure and the flow velocity of the muddy water taken along the horizontal axis and the funnel viscosity taken along the vertical axis.

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

FIG. 9 is an explanatory diagram illustrating an example of a mud pressure management device.

FIG. 10 shows a flow rate / density meter of muddy water, (A)
3 is a cross-sectional view in the axial direction of the mud pipe, and FIG. 3B is a cross-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 Shielding machine 42 Shield chamber 44 Mud feeding pipe 46 Face 50 Thickener tank 52 Filler tank 54 Line mixer 60 Viscometer 62 Calculation device 64 Flow meter 68 Density meter 80 Additive material supply means

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Yamashita 1-22-8 Nishi-Ikebukuro, Toshima-ku, Tokyo Inside the New Sewerage Technology Promotion Agency (72) Inventor Yoshio Iwai 1-chome Kyobashi, Chuo-ku, Tokyo No.7-1 Toda Construction Co., Ltd. (72) Inventor Sadao Noguchi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Isao Saito 1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd. (72) Inventor Yasutomo Katori 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Iku Sato 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (56) References JP-A-4-209294 (JP, A) JP-A-4-60096 (JP, A) JP-A-61-28699 (JP, A) JP-A-59-496 (JP, A) JP JP-A-4-194647 (JP, A) JP-A-4-147034 (JP, A) JP-A-62-194317 (JP, A) JP-A-51-140355 (JP, A) JP-A-50-80638 (JP, A) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (6)

(57) [Claims] 1. A feeding and viscosity meter for measuring the viscosity of mud provided through the Okudoro canal mud pipe, mud measured at the working face data and the viscosity meter detects the status of the working face by Face data detecting means viscosity And an additive supply means for supplying the thickener into the mud pipe based on the addition amount of the thickener determined by the arithmetic device.
A face stabilization control device for a muddy water shield machine , wherein the viscometer measures a pressure in at least two places in the mud pipe.
Differential pressure measuring means for measuring as a force difference, and flow velocity measuring means for measuring the flow velocity of muddy water in the mud pipe
And muddy water flowing in the mud pipe determined in advance by measurement
Storage means for storing the relationship between differential pressure, flow velocity and viscosity.
In addition, the storage means stores the ratio Δh /
V and the related data stored in the storage means.
A face stabilizing control device for a muddy shield machine, characterized in that it is formed to determine the viscosity of muddy water . 2. The face data detecting means according to claim 1, wherein the face data detecting means includes a soil layer discriminating device for detecting soil layer discriminating data, and the arithmetic device calculates a plugging material addition amount based on the soil layer discriminating data. The face stabilizing control device for a muddy water shield machine, wherein the additive material supply means supplies the filler material in addition to the thickening material to the mud pipe based on the amount of the filler material added. 3. The muddy water method according to claim 1, wherein a flow meter is provided in the mud feed pipe, and the arithmetic unit determines the properties of the mud feed from each data of viscosity and flow rate of the mud feed. Face stability controller for shield machine. 4. The method according to claim 3, wherein the viscometer, the flow meter, and the density meter are provided at a position in front of the additive supply unit, and the arithmetic unit determines an adjustment state based on information from each of the meters. And a feedback control of the additive supply means. 5. The sludge pipe according to claim 1, further comprising: a flow meter and a density meter provided in the sludge pipe, wherein the arithmetic unit determines the degree of face collapse and sludge from each data of the flow rate and the density of the sludge water. Features a stable face control system for muddy shield machines. 6. The thickening material tank according to claim 2, wherein the thickening material and the plugging material are respectively stored in the thickening material tank and the plugging material tank. A thickening agent adding pump and a filling material adding pump to be supplied into the mud pipe; and a thickening agent and a filling agent by the thickening material adding pump and the filling material adding pump based on an addition amount control signal from the arithmetic unit. A thickening material addition pump control device and a filling material addition pump control device for controlling the amount of filling material added, and a line for stirring and mixing the thickening material and the filling material supplied in the mud pipe using a mud flow. A mixer and a face stabilization control device for a muddy water shield machine, comprising: