JP2007191878A - Jacking management method for earth pressure type shield method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jacking management method for an earth pressure type shield method allowing management by grasping in real time the plastic flow state of excavated sediment in a chamber under tunnel excavation. <P>SOLUTION: The time sequence computed values of rotational torque computed by a measuring device 25, and the time sequence estimated values of rotational torque estimated by a flow analysis, are compared to verify the accuracy of rotational torque estimated by the flow analysis. When the accuracy is high, flow velocity and a shear rate are visualized. When the relation between the flow velocity and shear rate is appropriate, the flow direction and flow velocity of the excavated sediment are computed, and the flow direction and flow velocity of the excavated sediment in the chamber 19 are displayed on a monitor or the like to confirm the flow state of the excavated sediment in real time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a propulsion management method of earth pressure type shield method.

  In recent years, when constructing underground structures in urban areas, shield construction methods have been adopted in order to smoothly perform construction on roads with heavy traffic congestion and reduce the impact of construction on surrounding residents. It is often used during tunnel construction. In addition, because it is difficult to secure a sufficient work base area on the ground in urban areas, construction using earth pressure type shields that require a small area for equipment placement space compared to muddy water type shields that require a large area for equipment placement space. Needs are growing.

  However, the excavation method using earth pressure type shields has not established a method for grasping the plastic flow state of excavated soil in the chamber, which is important for maintaining the stability of the face, and it is difficult to completely suppress ground deformation. For this reason, it was rarely applied to a shield method with a large cross section. As shown in FIG. 19, the plastic fluidization is a state in which a shear rate generated in excavated earth and sand exceeds a certain value (τ 0) and a shear rate is generated to flow. Here, the shear stress is a force per unit area that causes a flow having a relative speed difference in the excavated soil (hereinafter referred to as shear strain), and the shear rate is a change in shear strain per unit time. Is the strain rate.

  In order to grasp the plastic flow state of excavated sediment in the chamber, for example, Patent Document 1 discloses a measuring device for measuring the flow state of excavated sediment. In addition, this Patent Document 1 also discloses an example in which the flow analysis method in the chamber shown in Non-Patent Documents 1 and 2 is applied to an actual shield machine.

  This measuring device includes a rotating plate installed in the chamber and a motor for driving the rotating plate, and the motor is driven to rotate the rotating plate by a predetermined angle so that the rotation resistance is rotated at the maximum position. The direction orthogonal to the main surface of the plate is the flow direction of the excavated earth and sand, and a value corresponding to the rotational torque at that time is calculated as the flow velocity.

And by the flow analysis method shown in Non-Patent Documents 1 and 2, flow analysis of excavated sediment in the chamber is performed for each of a plurality of geological conditions such as sand ground and viscosity ground, and the flow direction in each case Estimate the flow velocity, etc., and check the flow direction and flow velocity estimated from the flow analysis against the flow direction and flow velocity calculated by the measurement device described above, and select the flow analysis result with the best correlation. This is the flow state at the measurement point.
JP-A-2005-90174 "Tunnel and underground" August 1994, pages 35-39 "Flow analysis of mud and mud water in shield chamber" “Obayashi Institute of Technology Report” No. 48 August 1994 "Drilling sediment flow analysis in shield chamber"

  However, from the flow analysis described in Patent Document 1, only the flow direction in the chamber and its flow velocity are estimated, and there is a problem that the analysis regarding the shear rate of the index indicating the plastic flow state in the chamber has not been made. there were.

  In addition, it is difficult for the operator to compare the flow velocity and flow direction calculated from the measuring device with the flow velocity and flow direction estimated from the flow analysis on site, and to judge whether the correlation is good or bad because of the large amount of data. There was a problem.

  Further, there is no problem that a criterion for judging that the inside of the chamber is in a plastic flow state is not provided by comparing the flow velocity and flow direction calculated from the measuring device with the flow velocity and flow direction estimated from the flow analysis. was there.

  Therefore, the present invention has been made in view of the above-described conventional problems, and an earth pressure shield method capable of grasping and managing the plastic flow state of excavated earth and sand in a chamber during tunnel excavation in real time. The purpose is to provide a promotion management method.

In order to achieve the above-mentioned object, the earth pressure type shield method propulsion management method of the present invention is an earth pressure type shield method using a shield machine having a measuring device for measuring the rotational torque of a rotating plate installed in a chamber. In the propulsion management method, the step of measuring the rotational torque of the rotating plate with the measuring device, the flow analysis of the plastic flow state of the excavated sediment in the chamber, and the flow rate and shear rate of the excavated sediment in the entire chamber are simulated. Estimating the rotational torque of the rotating plate, comparing the rotational torque measured by the measuring device with the rotational torque estimated by the flow analysis, and verifying the accuracy of the rotational torque estimated by the flow analysis; In the verification, when the accuracy of the rotational torque estimated by the flow analysis is high, the step of visualizing the flow velocity and the shear velocity, And wherein further comprising the step of confirming the plastic flow state of excavating earth and sand the entire chamber on the basis of the visualization result (first invention).
According to the propulsion management method of the earth pressure type shield method according to the present invention, the accuracy of the flow analysis can be confirmed in order to verify the accuracy of the rotational torque estimated by the flow analysis. In addition, this verification only needs to compare the rotational torque calculated by the measuring device with the rotational torque estimated by the flow analysis, and the worker can easily compare and examine it on site. And when the precision of the rotational torque estimated by the flow analysis is high, in order to visualize the flow velocity and shear rate of the excavated earth and sand, it becomes possible to grasp the plastic flow state in the entire chamber. Furthermore, since the visualized plastic flow state can be confirmed, the chamber can be reliably brought into a plastic flow rate state during tunnel excavation.

In a second aspect of the present invention, in the first aspect, when the plastic flow state in the chamber is appropriate in the confirmation, the step of calculating the flow direction and flow velocity of the excavated sediment at the measurement point from the rotational torque measured by the measuring device. And a step of visualizing the flow direction and the flow velocity, and a step of managing the face state such as adjustment of the injection amount of the mud, adjustment of the excavation speed based on the visualized result, To do.
According to the earth pressure type shield construction promotion management method according to the present invention, in order to display the flow direction and flow velocity of excavated soil at the measurement point on a monitor or the like in real time, It is possible to change the injection amount and adjust the excavation speed.

According to a third invention, in the first invention, in the verification, the plastic flow state of the execution work and the plastic flow state estimated by the flow analysis are substantially the same, and the rotational torque estimated by the flow analysis is Is less accurate, the flow analysis input condition is changed, and the step of estimating the rotational torque of the rotating plate is performed again.
According to the earth pressure type shield construction promotion management method according to the present invention, even when the accuracy of the rotational torque estimated by the flow analysis is low, a high-precision analysis is performed by changing the flow analysis input conditions and performing the flow analysis again. The result can be obtained. Also, by verifying the analysis accuracy, it is possible to improve the accuracy of the analysis technique.

According to a fourth aspect of the present invention, in the first or third aspect of the invention, the verification is based on the rotational torque measured by the measuring device when the flow state of the working work and the flow state estimated by the flow analysis are substantially the same The time series measured value and the rotational torque time series estimated value estimated in the flow analysis are compared.If the fluctuation patterns of both values are similar, the accuracy is high, and the fluctuation patterns of both values are similar. If not, it is determined that the accuracy is low.
According to the earth pressure type shield construction method according to the present invention, the verification can be easily performed in a short time by comparing only the fluctuation patterns of the rotational torque.

According to a fifth invention, in the first or second invention, when the plastic flow state in the chamber is inappropriate in the confirmation, the rotational torque of the rotating plate is passed through a step of changing the input condition of the flow analysis. The step of estimating is performed again.
According to the earth pressure type shield construction promotion management method according to the present invention, even when the plastic flow state in the chamber is inappropriate, the analysis result with high accuracy can be obtained by changing the flow analysis input condition and performing the flow analysis again. Can be obtained. In addition, by confirming the analysis result, the accuracy of the analysis technique can be improved.

In a sixth aspect of the present invention based on any one of the first, second, and fifth aspects, the confirmation is performed by evaluating a relationship between the flow velocity and the shear velocity, and a relationship between the flow velocity and the shear velocity is predetermined. It is characterized in that it is appropriate if it is within the range, and is inappropriate if it is not in the predetermined range.
According to the propulsion management method of the earth pressure type shield method according to the present invention, since the relationship between the flow velocity and the shear velocity is evaluated in the figure, whether or not the relationship between the flow velocity and the shear velocity is within a predetermined range. Can be easily determined. Therefore, even if it is not a person skilled in earth pressure type shield construction method, it can judge.

According to a seventh invention, in the first or second invention, the flow direction and the flow velocity are displayed as vectors.
According to the propulsion management method of the earth pressure shield method according to the present invention, it becomes possible to easily grasp the flow direction and flow velocity of excavated earth and sand.

An eighth invention is characterized in that, in the first invention, the shearing speed is displayed as a scalar.
According to the propulsion management method of the earth pressure type shield method according to the present invention, it is possible to easily grasp the distribution state of the shear rate.

  As described above, according to the promotion management method of the earth pressure type shield method of the present invention, it is possible to grasp and manage the plastic flow state of excavated earth and sand in the chamber while excavating the tunnel in real time. In addition, even when using an earth pressure shield machine with a medium or large cross section, the tunnel can be safely excavated in a state where the face is stabilized.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view of a shield machine according to the first embodiment of the present invention, and FIG. 2 is a view taken along the line AA ′ in FIG.

  As shown in FIGS. 1 and 2, the earth pressure shield machine 1 connects the hood part 3 for excavating the face at the front part in the traveling direction, the tail part for lining at the rear part, and the hood part 3 and the tail part. In addition, the girder portion 5 is provided with propulsion equipment and the like, and includes a skin plate 9 made of a rectangular cylindrical steel shell for protecting each portion described above against a load acting from the outside.

  The front part of the earth pressure type shield machine 1 transmits a cutter 11 having a cutter bit on the front side of the earth pressure type shield machine 1, a drive source 13 for driving the cutter 11, and the driving force of the drive source 13 to the cutter 11. A rotating shaft 15, a chamber 19 sealed with a partition wall 17 and a cutter 11 for applying and maintaining a constant pressure on the excavated earth and sand, and a soil discharging mechanism 21 for discharging the excavated earth and sand from the chamber 19. , A stirring device 23 for stirring and kneading the excavated earth and sand in the chamber 19, a fixed blade 24 for enhancing the kneading effect of the excavated earth and mud material, and the flow direction and flow velocity of the excavated earth and sand in the chamber 19. And a measuring device 25 for estimation.

  An agitator 27 is provided on the outer peripheral surface of the rotating shaft 15 so as to protrude into the chamber 19, and this agitator 27 is rotated independently of the cutter 11 by a drive motor 29 installed in the girder unit 5. Driven.

  The agitation device 23 is concentric with the central axis of the earth pressure shield machine 1 and is disposed on three circumferences having different diameters at predetermined intervals in the circumferential direction, and is projected into the chamber 19 so as to protrude into the chamber 19. Multiple units are provided on the back side.

  The fixed wings 24 are concentric with the central axis of the earth pressure shield machine 1 and are arranged on three circumferences having different diameters at predetermined intervals in the circumferential direction, and project into the chamber 19 so as to protrude into the chamber 19. Multiple units are provided on the front side.

  The measuring device 25 transmits a plate-shaped rotating plate 31 disposed so as to face the flow direction of the excavated sediment, a motor 33 for driving the rotating plate 31, and a driving force of the motor 33 to the rotating plate 31. A rod 35, a current measuring device 37 for measuring the current value of the motor 33, an angle detector 39 for detecting the rotation angle of the rotating plate 31, and the rotating plate 31 in the direction of the central axis of the earth pressure shield machine 1 And a cylinder 41 for enabling movement. A plurality of measuring devices 25 are arranged at a predetermined interval in the circumferential direction on a concentric circle with the central axis of the earth pressure shield machine 1 and are provided at positions where mutual interference with the agitator and the agitator 27 is avoided. In addition, in this embodiment, although the measuring apparatus 25 demonstrated the method of installing in the circumferential direction at predetermined intervals on the concentric circle with the center axis | shaft of the earth pressure type shield machine 1, it is not limited to this position. It can be installed at any position.

  The rotating plate 31 of the measuring device 25 is a rectangular flat plate and is arranged so that the main surface of the flat plate faces the flow direction of excavated earth and sand flowing in the chamber. When the excavated sediment flows in the chamber 19, the main surface of the rotating plate 31 rotates around an axis parallel to the central axis of the earth pressure shield machine 1.

  Below, the propulsion management method at the time of excavating a tunnel with the earth pressure type shield machine 1 mentioned above is demonstrated.

  FIG. 3 is a flowchart showing the procedure of promotion management according to the present embodiment. In S10 of FIG. 3, the measuring device 25 calculates the rotational torque of the rotating plate 31. Since the rotational torque is proportional to the current value supplied to the motor 33, the current value of the motor 33 is measured by a current measuring device 37, and the rotational torque is calculated by multiplying this measured value by a coefficient determined in advance at the time of design. calculate.

  FIG. 4 is a diagram modeling the inside of the chamber 19 according to the present embodiment. In S20 of FIG. 3, the inside of the chamber 19 of the earth pressure type shield machine 1 is modeled as shown in FIG. 4 by the method disclosed in Non-Patent Documents 2 and 3 described above.

  FIG. 5 is a diagram illustrating a ground particle size curve according to the present embodiment, and FIG. 6 is a diagram illustrating input conditions for flow analysis according to the present embodiment. In S22 of FIG. 3, based on the modeled model and input conditions (shown later), flow analysis of the excavated sediment is performed by the methods disclosed in Non-Patent Documents 2 and 3 described above, and the flow velocity and shear rate are determined. The rotational torque of the rotating plate 31 is estimated by simulation.

  The basic equation used for the flow analysis is an incompressible Navier-Stokes equation that considers density stratification, assuming that the excavated sediment in the chamber 19 is a fluid composed of natural soil and mud (bubble) material. . In addition, the dynamic multi-block method was applied to complicated moving boundary portions such as the rotation of the cutter 11.

  In this embodiment, the analysis target of the flow analysis is, for example, the ground having a particle size curve as shown in FIG. In the present embodiment, as shown in FIG. 6, the flow analysis input conditions are, for example, that the rotational speed of the agitator 27 is 1.365 rpm, the rotational speed of the cutter 11 is 0.46 rpm, and the rotational speed of the rotating plate 31 is 1. The excavation speed of the earth pressure type shield machine 1 is 20 mm / min. Furthermore, as input conditions for the flow analysis, the fluid density calculated from the volume occupancy ratio between the ground density and the mud density is input, and the viscosity formula for each soil type (not shown) is also input.

  FIG. 7 is a diagram comparing the rotational torque calculated by the measuring device 25 according to the present embodiment and the rotational torque estimated by the flow analysis. In S30 of FIG. 3, the rotation torque estimated by the flow analysis is compared by comparing the calculated value of the rotation torque measured by the measuring device 25 with the estimated value of the rotation torque estimated by the flow analysis. Verify torque accuracy. As illustrated in FIG. 7, when the variation patterns of the calculated value and the estimated value are similar, it is determined that the accuracy of the estimated value is high.

  On the other hand, if the actual flow state and the flow state estimated by the flow analysis are the same input conditions and the variation pattern between the calculated value and the estimated value is not similar, it is determined that the accuracy of the estimated value is low. . If the accuracy of the estimated value is low, the flow analysis input conditions described above are changed in S32 of FIG. 3, and the flow analysis of S22 is performed again.

  8, 9, and 10 are flow velocity distribution diagrams near the cutter face, near the center of the chamber 19 and near the partition wall 17 according to the present embodiment, respectively. 11, FIG. 12, and FIG. 13 are shear velocity distribution diagrams in the vicinity of the cutter face, the vicinity of the center of the chamber 19 and the vicinity of the partition wall 17 according to the present embodiment, respectively. In this embodiment, the vicinity of the cutter face, the vicinity of the center of the chamber 19 and the vicinity of the partition wall 17 are respectively positioned forward from the partition wall 17 by, for example, 1.7 m, 0.9 m, and 0.45 m.

  When the accuracy of the rotational torque estimated by the flow analysis is high, the flow velocity and the shear velocity are visualized as shown in FIGS. 8 to 13 in S34 of FIG. The flow velocity is displayed as a vector, and the flow velocity and flow direction of the excavated sediment are displayed according to the length and direction of the arrows. Also, the shear rate is displayed as a scalar, and the magnitude of the speed is displayed according to the color density.

  The excavated earth and sand in the chamber 19 is given a flow velocity by the rotation of the cutter 11, and shear stress is generated by the stirring device 23 and the agitator 27. When the excavated sediment in the chamber 19 is in a plastic flow state, it is presumed that a shear rate is generated when shear stress is generated.

  As shown in FIGS. 8 to 13, in the present embodiment, in the transverse direction, the distribution of the flow velocity and shear velocity is uniform in the vicinity of the outer periphery of the earth pressure shield machine 1, the vicinity of the agitator 27, and the vicinity of the rotary shaft 15. Rather, different states are confirmed. Also in the longitudinal direction, the distribution of flow velocity and shear velocity is not uniform in the vicinity of the cutter face, near the center of the chamber 19 and near the partition wall 17, and different states are confirmed.

  FIG. 14 is a diagram showing a flow state of excavated earth and sand according to the present embodiment. As shown in FIG. 14, when focusing on the relationship between the flow velocity and the shear rate, and classifying the flow state of the excavated sediment in the chamber 19, the region I has an appropriate flow velocity and shear rate, It is presumed that the excavated sediment in the chamber 19 is plastic fluidized. Further, since the region II has a low flow velocity and a low shear rate, the excavated sediment in the chamber 19 is not in a state of plastic fluidization, or the excavated sediment is in a state in which it is difficult to stir. Guessed. And in the area | region III, since the flow rate is small and the shear rate is large, it is estimated that the excavated sediment in the chamber 19 is in a very high fluidity state. In the region IV, since the flow velocity is high and the shear rate is low, it is presumed that the excavated soil in the chamber 19 is not plastically fluidized or is a portion with little stirring effect.

  15, 16, and 17 are diagrams showing the flow of excavated soil near the cutter face, near the center of the chamber 19, and near the partition wall 17 according to the present embodiment, with the vertical axis representing the flow velocity and the horizontal axis representing the logarithm. It's a drag speed. In addition, the transverse region is defined as (1) agitator 27 region (0 to 1 / 3R, R is a shield radius), (2) cutter support portion (1 / 3R to 2 / 3R), (3) outer peripheral portion ( 2 / 3R to 1R), and the relationship between the flow rate and the shear rate was shown.

  In S36 of FIG. 3, the relationship between the flow velocity and the shear velocity in the vicinity of the cutter face, in the vicinity of the center of the chamber 19 and in the vicinity of the partition wall 17 is evaluated. As shown in FIGS. 15 to 17, the relationship between the flow velocity and the shear rate in the vicinity of the center of the chamber 19 rather than in the vicinity of the cutter face and in the vicinity of the partition wall 17 in the vicinity of the center of the chamber 19 shifts near the center of the graph. This is a state in which the excavated earth and sand is plastically fluidized by the effects of the agitator 23 and the agitator 27 when it moves from the vicinity of the cutter face to the vicinity of the partition wall 17. In consideration of the fact that the soil removal situation was good and the face was stable in the construction work, this flow analysis result simulates the case where the sediment in the chamber 19 is appropriately plasticized and analyzed. It shows that the accuracy is high.

Here, when the relationship between the flow velocity and the shear velocity is in the range of II, III, IV and the plastic flow state is inappropriate, the flow analysis input conditions are changed in S32 of FIG. Perform flow analysis.
If the relationship between the flow velocity and the shear velocity falls within the range I and the plastic flow state is appropriate, the flow direction and flow velocity of the excavated sediment are calculated in S38 of FIG.

  Among the calculated values of the rotational torque shown in FIG. 7, when the rotational resistance is at the maximum position, the direction perpendicular to the main surface of the rotating plate 31 is the flow direction of the excavated earth and sand, and the value corresponding to the rotational torque at that time flows Estimated directional flow velocity.

  FIG. 18 is a diagram showing a flow state of excavated sediment in the chamber 19 according to the present embodiment. In S40 of FIG. 3, as shown in FIG. 18, the flow direction and flow rate of the excavated sediment in the chamber 19 are displayed on a monitor or the like, thereby confirming the flow state of the excavated sediment in real time. In the present embodiment, the flow direction and the flow velocity indicate the angles and current values measured by the angle detector 39 and the current measuring device 37, respectively. In the present embodiment, the measured values measured by the angle detector 39 and the current measuring device 37 for the flow direction and the flow velocity, respectively, are displayed as they are, but the present invention is not limited to this. For example, the angle detector 39 Alternatively, a method may be used in which the measurement values measured by the current measuring device 37 are converted into flow direction and flow velocity and displayed.

  In S42 of FIG. 3, when the current value measured by the current measuring device 37 is larger than a predetermined value set in advance, the earth pressure type shield machine 1 is activated by issuing a warning sound, lighting a warning light, or the like. Alert the operator. The operator immediately adjusts the amount, position, type, etc. of the vulcanized material, adjusts the excavation speed, and manages the face.

  According to the propulsion management method of the earth pressure type shield method in the present embodiment described above, the accuracy of the flow analysis can be confirmed in order to verify the accuracy of the rotational torque estimated by the flow analysis. In addition, this verification only needs to compare the calculated value of the rotational torque calculated by the measuring device 25 with the estimated value of the rotational torque estimated by the flow analysis, and it is possible for the operator to easily compare and examine it on site. Become. And when the precision of the estimated value estimated by the flow analysis is high, it becomes possible to grasp the entire plastic flow state in the chamber 19 in order to visualize the flow velocity and shear rate of the excavated sediment. Furthermore, since the visualized plastic flow state can be confirmed, the inside of the chamber 19 can be surely brought into a plastic flow rate state during tunnel excavation.

  In addition, since the flow direction and flow velocity of the excavated soil at the measurement point are displayed in real time on a monitor, etc., it is possible to respond to sudden changes in the excavated ground properties, such as changing the amount of added mud and adjusting the excavation speed Become.

  And even when the accuracy of the estimated value of the rotational torque estimated by the flow analysis is low, it is possible to obtain a highly accurate analysis result by changing the flow analysis input conditions and performing the flow analysis again. In addition, by verifying the analysis accuracy, it is possible to improve the accuracy of the analysis technique.

  Furthermore, even when the plastic flow state in the chamber 19 is inappropriate, it is possible to obtain a highly accurate analysis result by changing the flow analysis input conditions and performing the flow analysis again. In addition, by confirming the analysis result, the accuracy of the analysis technique can be improved.

  Further, since the relationship between the flow rate and the shear rate is illustrated and evaluated, it is possible to easily determine whether or not the relationship between the flow rate and the shear rate is within a predetermined range. Therefore, even if it is not a person skilled in earth pressure type shield construction method, it can judge.

  Then, by displaying the flow direction and flow velocity of the excavated sediment in vector display and the shear rate in scalar display, the flow state of the excavated sediment in the chamber can be easily grasped.

  In the present embodiment, the method for managing the face state has been described with respect to the adjustment of the addition amount, addition position, type, and the like of the mud material, and the adjustment of the excavation speed. It is also possible to manage the face condition by adjusting the soil removal speed of the soil mechanism.

It is sectional drawing of the earth pressure type shield machine which concerns on 1st embodiment of this invention. It is an A-A 'arrow line view of FIG. It is a flowchart which shows the procedure of the promotion management which concerns on this embodiment. It is the figure which modeled the inside of the chamber concerning this embodiment. It is a figure which shows the particle size curve of the ground which concerns on this embodiment. It is a figure which shows the input conditions of the flow analysis which concerns on this embodiment. It is the figure which compared the rotational torque calculated with the measuring apparatus which concerns on this embodiment, and the rotational torque estimated by the flow analysis. It is a flow velocity distribution map near the cutter face according to the present embodiment. It is a flow velocity distribution map near the center of the chamber according to the present embodiment. It is a flow velocity distribution map near the partition according to the present embodiment. It is a shear velocity distribution map in the vicinity of the cutter face according to the present embodiment. It is a shear rate distribution map near the center of the chamber according to the present embodiment. It is a shear rate distribution map of the partition vicinity which concerns on this embodiment. It is a figure which shows the flow state of the excavation earth and sand which concerns on this embodiment. It is a figure which shows the flow state of excavation earth and sand near the cutter face which concerns on this embodiment. It is a figure which shows the flow state of excavation earth and sand near the chamber center which concerns on this embodiment. It is a figure which shows the flow state of the excavation earth and sand of the partition vicinity which concerns on this embodiment. It is the figure which displayed the flow state of the excavation earth and sand in the chamber which concerns on this embodiment. It is a figure which shows the plastic flow state of excavated earth and sand.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Earth pressure type shield machine 3 Hood part 5 Girder part 9 Skin plate 11 Cutter 13 Driving source 15 Rotating shaft 17 Bulkhead 19 Chamber 21 Earth removal mechanism 23 Stirring device 24 Fixed blade 25 Measuring device 27 Agitator 29 Driving motor 31 Rotating plate 33 Motor 35 Rod 37 Current measuring device 39 Angle detector

Claims (8)

In the promotion management method of earth pressure type shield method using a shield machine having a measuring device for measuring the rotational torque of the rotating plate installed in the chamber,
Measuring the rotational torque of the rotating plate with the measuring device;
Analyzing the plastic flow state of the excavated sediment in the chamber, estimating the rotational torque of the rotating plate by simulating the flow velocity and shear rate of the excavated sediment in the entire chamber;
Comparing the rotational torque measured by the measuring device and the rotational torque estimated by the flow analysis, and verifying the accuracy of the rotational torque estimated by the flow analysis;
When the accuracy of the rotational torque estimated by the flow analysis in the verification is high, the step of visualizing the flow velocity and the shear velocity;
And a step of confirming the plastic flow state of the excavated earth and sand in the entire chamber based on the visualized result. When the plastic flow state in the chamber is appropriate in the confirmation, calculating the flow direction and flow velocity of the excavated soil at the measurement point from the rotational torque measured by the measuring device;
Displaying the flow direction and the flow velocity;
The management of the earth pressure type shield construction method according to claim 1, further comprising a step of managing the face state such as adjustment of the amount of added mud, adjustment of the excavation speed based on the displayed result. Method.   In the verification, if the plastic flow state of the execution work and the plastic flow state estimated by the flow analysis are substantially the same and the accuracy of the rotational torque estimated by the flow analysis is low, the input of the flow analysis is 2. The earth pressure type shield construction propulsion management method according to claim 1, wherein the step of changing the conditions and estimating the rotational torque of the rotating plate is performed again.   In the verification, when the flow state of the execution work and the flow state estimated by the flow analysis are substantially the same, the time-series measured value of the rotational torque measured by the measuring device and the rotational torque estimated by the flow analysis It is characterized in that the accuracy is high when the fluctuation patterns of both values are similar, and the accuracy is low when the fluctuation patterns of both values are not similar. The promotion management method of the earth pressure type shield method of Claim 1 or 3.   2. If the plastic flow state in the chamber is inappropriate in the confirmation, the step of estimating the rotational torque of the rotating plate is performed again through the step of changing the input condition of the flow analysis. Or the promotion management method of the earth pressure type shield construction method of 2. The confirmation
Evaluate the relationship between the flow rate and the shear rate, and if the relationship between the flow rate and the shear rate is within a predetermined range, it is appropriate. If it is not within the predetermined range, it is inappropriate. The earth pressure type shield construction promotion management method according to any one of claims 1, 2, and 5, characterized in that:   The propulsion management method of the earth pressure shield method according to claim 1 or 2, wherein the flow direction and the flow velocity are displayed as vectors. The shear management method according to claim 1, wherein the shear rate is displayed as a scalar.