JP2012225131A - Soil pressure management apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil pressure management apparatus for shield in which influences of stirring vanes on the back of a cutter head can be excluded.SOLUTION: A soil pressure management apparatus is applied to a shield machine 10 including stirring vanes 12 on the back of a cutter head 11. The soil pressure management apparatus comprises a soil pressure sensor 1 for measuring soil pressure in a chamber, a position sensor 2 for detecting positions of the stirring vanes 12, determination means 3 which determines whether or not the stirring vanes 12 are positioned in the vicinity of the soil pressure sensor 1 on the basis of position data acquired by the position sensor 2, and soil pressure data creation means 4 for display which creates soil pressure data for display to be displayed on display means 5. The soil pressure data creation means 4 for display creates soil pressure data for display while excluding soil pressure data acquired by the soil pressure sensor 1 from a soil pressure data group acquired by the soil pressure sensor 1 when a determination result of the determination means 3 is a positive determination, and while using soil pressure data acquired in the soil pressure sensor 1 when the determination result of the determination means 3 is a negative determination.

Description

  The present invention relates to a soil pressure management device for a shield machine.

  When excavating a sealed earth pressure type (including mud pressure type) shield machine, the earth pressure (including mud pressure) in the chamber is measured, and excavation management is performed based on the obtained earth pressure data. (For example, refer to Patent Document 1).

JP 2007-255117 A

  In order to accurately determine the stable state of the face, it is necessary to accurately grasp the earth pressure fluctuation. If the soil pressure fluctuations that affect the stable state of the face can be accurately grasped, the safety of tunnel excavation work will increase.

  From such a viewpoint, the present invention is an earth pressure management device for managing earth pressure in a chamber, and can accurately grasp earth pressure fluctuations that affect the stable state of the face. It is an object to provide an earth pressure management device.

  The inventor pursued the cause of the earth pressure fluctuation in the chamber, and the stirring blade (mixing blade) on the back of the cutter head pushed away the excavated soil (including the excavated soil in which the mud material was kneaded) in the chamber. It has been found that the earth pressure tends to increase in the region on the front side of the agitating blade in the traveling direction, and the earth pressure tends to decrease in the region on the rear side of the agitating blade in the traveling direction.

  The present invention created based on such knowledge is an earth pressure management device applied to a shield machine provided with a stirring blade on the back of a cutter head, and an earth pressure sensor for measuring earth pressure in a chamber; A position sensor for detecting the position of the stirring blade, and a determination means for determining whether the stirring blade is located in the vicinity of the earth pressure sensor based on position data acquired by the position sensor And display earth pressure data creation means for creating display earth pressure data to be displayed on the display means, wherein the display earth pressure data creation means includes the earth pressure data group acquired by the earth pressure sensor, Earth pressure data acquired by the earth pressure sensor when the judgment result of the judgment means is affirmative judgment is excluded, and earth pressure obtained by the earth pressure sensor when the judgment result of the judgment means is negative data Use, characterized by creating said display soil pressure data.

  According to the present invention, when the determination result of the determination means is affirmative (when the stirring blade is turning in the vicinity of the earth pressure sensor), the earth pressure data acquired by the earth pressure sensor is obtained from the earth pressure data for display. It will be excluded. That is, according to the present invention, since the earth pressure fluctuation due to the swirling of the stirring blade is not displayed, the earth pressure fluctuation due to factors other than the stirring blade becomes relatively obvious, for example, the stable state of the face Therefore, it is possible to easily grasp the earth pressure fluctuations that have an influence on the soil, and to perform highly accurate excavation management. The earth pressure fluctuations caused by the swirling of the stirring blades are periodically generated with the swirling of the stirring blades and are not related to the stable state of the face. Even if the fluctuation is eliminated, no particular problem occurs.

  When a plurality of earth pressure sensors are provided, the above-described determination process is performed for each earth pressure sensor. When a plurality of earth pressure sensors are arranged, it is desirable to determine the installation positions of the earth pressure sensors so that earth pressure data relating to all earth pressure sensors are not excluded at the same time.

  According to the present invention, it is possible to provide earth pressure data from which the earth pressure fluctuation caused by the agitating blade is excluded, so that the earth pressure fluctuation that affects the stable state of the face can be accurately grasped. As a result, the safety of tunnel excavation work is improved.

It is a block diagram of the earth pressure management device concerning the embodiment of the present invention. The schematic sectional drawing of the shield machine to which the earth pressure management apparatus which concerns on embodiment of this invention is applied, (b) is an expanded sectional view for demonstrating the influence range of a stirring blade. It is a figure which shows the earth pressure data for a display, Comprising: (a) is a figure which shows the time history data of the earth pressure created based on the earth pressure data acquired with the 1st earth pressure sensor, (b) is the 2nd earth pressure. The figure which shows the time history data of the earth pressure created based on the earth pressure data acquired with the sensor and the 3rd earth pressure sensor, (c) is the average created based on the earth pressure acquired with the several earth pressure sensors It is earth pressure time history data.

  The earth pressure management device according to the embodiment of the present invention is used for excavation management of a sealed mud pressure shield machine 10 (see FIG. 2).

  As shown in FIG. 2A, the shield machine 10 includes a cutter head 11, stirring blades 12, 12,..., A partition wall 13, a soil discharging means 14, a mud addition material injection system 15, and the like. The excavated soil cut by the cutter head 11 is taken into the chamber (the space between the cutter head 11 and the partition wall 13) together with the mud material injected from the mud material inlet system 15, and the stirring blades 12, 12. Are discharged from the chamber by the earth discharging means 14 while being stirred by. The stirring blades 12, 12,... Are arranged for the purpose of promoting plastic fluidization of the excavated soil taken into the chamber and preventing the excavated soil from adhering or accumulating, and are attached to the back surface of the cutter head 11. It has been. Although there is no restriction | limiting in the shape of the stirring blade 12, The thing of this embodiment is a column shape.

  As shown in FIG. 1, the cutter head 11 includes a plurality (four in this embodiment) of cutter spokes 11 a to 11 d extending radially from the rotation axis. The cutter spokes 11a to 11d are arranged in a cross shape at a pitch of 90 degrees.

  The stirring blades 12, 12,... Rotate around the rotation axis of the cutter head 11 as the cutter head 11 rotates. In the present embodiment, two stirring blades 12 and 12 are attached to one cutter spoke.

  The inner peripheral agitating blades 12, 12,... Swirl along the first movement route P, and the outer peripheral agitating blades 12, 12,. The movement routes P and Q are obtained by projecting the movement trajectory of the central axis of the stirring blade 12 onto the partition wall 13 and are concentric circles around the rotation axis of the cutter head 11.

  The earth pressure management apparatus according to the present embodiment is constituted by earth pressure sensors 1, 1,... And position sensor 2 provided in the shield machine 10, a determination means 3 constituted by a computer, a display earth pressure data creation means 4, and a display. The display means 5 is provided.

  The earth pressure sensor 1 is a sensor for measuring the earth pressure in the chamber, and is attached to the partition wall 13 as shown in FIG. The pressure receiving portion of the earth pressure sensor 1 is provided so as to be flush with the partition wall 13 and is exposed in the chamber. The earth pressure sensor 1 of the present embodiment is a strain gauge type earth pressure sensor, and outputs a voltage value correlated with the earth pressure acting on the pressure receiving portion. The voltage value (raw data) output from the earth pressure sensor 1 is converted into an earth pressure value (earth pressure data) by a measuring means (not shown) provided in front of the display earth pressure data creating means 4. The measuring means samples the analog data of the voltage value output from the earth pressure sensor 1 at a predetermined time interval, and multiplies the sampled voltage value (digitized voltage value) by a calibration coefficient to obtain a voltage. The value is converted into earth pressure data, and the obtained earth pressure data is output to the earth pressure data creating means 4 for display.

  Although there is no restriction | limiting in the number of earth pressure sensors 1, as shown in FIG. 1, it is three in this embodiment. There is no restriction on the installation position of the earth pressure sensor 1, but in this embodiment, two of the three earth pressure sensors 1, 1, 1 are installed on the spring line, and the other one is disconnected from the spring line. It is installed at the position. The three earth pressure sensors 1, 1, 1 are all located in a circular band region sandwiched between the movement routes P, Q.

  In the following description, when the three earth pressure sensors 1, 1, 1 are distinguished, the earth pressure sensor 1 at a position off the spring line is referred to as a “first earth pressure sensor 1 a” and The pair of left and right earth pressure sensors 1, 1 located at the left are called “second earth pressure sensor 1 b” and “third earth pressure sensor 1 c”, respectively.

  In FIG. 1, the solid thick line portion drawn on the movement route P in the vicinity of the first earth pressure sensor 1a is a virtual line indicating the first data exclusion section Ra, and is in the vicinity of the second earth pressure sensor 1b. The solid thick line portion drawn on the moving route P is a virtual line indicating the second data exclusion section Rb. In addition, the solid thick line portion drawn on the movement route P in the vicinity of the third earth pressure sensor 1c is a virtual line indicating the third data exclusion section Rc.

  The data exclusion sections Ra, Rb, and Rc are set in consideration of the range (hereinafter referred to as “influence range”) to which the earth pressure fluctuation accompanying the turning of the stirring blade 12 extends. That is, since the stirring blade 12 turns (advances) while pushing away the excavated soil in the chamber, the earth pressure rises in the region on the front side in the traveling direction of the stirring blade 12 and in the region on the rear side in the traveling direction of the stirring blade 12. Although the pressure tends to decrease, such earth pressure fluctuations appear remarkably in the vicinity of the stirring blade 12 and become smaller as the distance from the stirring blade 12 increases. Although the range of influence of the stirring blade 12 varies depending on the shape and size of the stirring blade 12, as shown in FIG. 2B, the truncated cone expands at an angle of 45 degrees from the tip of the maximum outer diameter portion of the stirring blade 12. Assuming that the maximum outer diameter of the stirring blade 12 is D and the separation distance between the tip of the maximum outer diameter portion and the partition wall 13 is x, a circle having a diameter (D + 2x) is provided at the partition wall 13 position. Is the range of influence of the stirring blade 12. For example, when D = 200 mm and x = 80 mm, the inner side of a circle having a diameter of 360 mm (= 1.8 D) is the influence range of the stirring blade 12 at the position of the partition wall 13 and D = 150 mm and x = 100 mm. In this case, at the position of the partition wall 13, the inner side of a circle having a diameter of 350 mm (≈2.3D) is an influence range of the stirring blade 12.

  In consideration of the above-mentioned influence range, in this embodiment, sections in which the distance from the movement route P to the pressure receiving portions of the earth pressure sensors 1a, 1b, 1c is (D / 2 + x) are defined as data exclusion sections Ra, Rb, Rc. Yes.

  The position sensor 2 is for detecting the position of the stirring blade 12. The position data acquired by the position sensor 2 is used by the determination unit 3. Although there is no restriction | limiting in the kind of position sensor 2, the position sensor 2 of this embodiment consists of an absolute-type rotary encoder, and the rotation angle from the reference line S of the cutter spoke 11a (henceforth "reference | standard cutter spoke 11a"). Can be detected. In the present embodiment, a line segment connecting the rotation axis of the cutter head 11 and the tunnel ceiling is used as the reference line S.

  The determination means 3 and the display earth pressure data creation means 4 are realized by a computer. The computer includes a CPU (Central Processing Unit) and a storage device (RAM, ROM, hard disk, etc.), an interface for exchanging data with the earth pressure sensor 1, the position sensor 2 and the display means 5. It has. The storage device stores a program for causing the computer to function as the determination unit 3 and the display earth pressure data creation unit 4. When the program read from the storage device is executed by the CPU, the computer executes the determination unit 3 and the display soil data. It functions as the pressure data creation means 4.

  The display means 5 is a display for displaying the display earth pressure data output from the display earth pressure data creating means 4.

The structure of the determination means 3 and the display earth pressure data preparation means 4 is demonstrated in detail.
Based on the position data output from the position sensor 2, the determination unit 3 determines whether or not the stirring blade 12 is positioned in the vicinity of the earth pressure sensor 1.

  In the following, reference numeral 12a may be attached to the stirring blade 12 fixed to the reference cutter spoke 11a, and reference numerals 12b, 12b, 11c, and 11d may be attached to the stirring blades 12 fixed to the other cutter spokes 11b, 11c, and 11d, respectively. 12c and 12d may be attached.

First, the determination unit 3 reads the position data (the rotation angle θ _a of the reference cutter spoke 11a with respect to the reference line S) output from the position sensor 2 and the position of the stirring blade 12a (the rotation angle) based on the read position data. ) Is calculated. Rotation angle of the stirring blade 12a is in this embodiment is the same as the rotation angle theta _a reference cutter spokes 11a. The rotation angles θ _b , θ _c , and θ _d of the other stirring blades 12b, 12c, and 12d may be calculated according to (a) to (c).
(A) θ _b = θ _a +90 degrees (when 0 ≦ θ _a <270 degrees)
θ _b = θ _a −270 degrees (when 270 degrees ≦ θ _a <360 degrees)
(B) θ _c = θ _a +180 degrees (when 0 ≦ θ _a <180 degrees)
θ _c = θ _a −180 degrees (when 180 degrees ≦ θ _a <360 degrees)
(C) θ _d = θ _a +270 degrees (when 0 ≦ θ _a <90 degrees)
θ _d = θ _a −90 degrees (when 90 degrees ≦ θ _a <360 degrees)

When the rotation angle theta _a reference cutter spokes 11a is obtained, determination unit 3 performs a process of determining whether or not the stirring blade 12 in the vicinity of the earth pressure sensor 1 is located. When the determination result is affirmative, the determination unit 3 generates “positive determination information” indicating that a positive determination has been made (for example, the flag is set to “1”), and the positive determination is performed. When it is made, a process of giving affirmative determination information to the earth pressure data acquired by the earth pressure sensor 1 is executed. If the determination result is a negative determination, the determination means 3 generates negative determination information indicating that a negative determination has been made (for example, sets a flag to “0”), and a negative determination is made. When it is made, a process of giving negative determination information to the earth pressure data acquired by the earth pressure sensor 1 is executed.

For example, the start point of the first data exclusion section Ra is set at a position rotated by an angle α _{a with} respect to the reference line S, and the end point of the first data exclusion section Ra is an angle β _{a with} respect to the reference line S. If the position is set at a position rotated by (> α _a ), the determination means 3 determines that the first earth pressure sensor 1a when any one of the conditions shown in (1) to (4) is satisfied. The affirmative determination information indicating that the agitating blade 12 is located in the vicinity of is generated, and the affirmative determination information is given to the earth pressure data acquired by the first earth pressure sensor 1a (for example, the first earth pressure) The flag “1” is associated with the earth pressure data acquired by the sensor 1a).
(1) α _a <θ _a <β _a
(2) α _a +90 degrees <θ _a <β _a +90 degrees (3) α _a +180 ° <θ _a <β _a +180 degrees (4) α _a +270 ° <θ _a <β _a +270 degrees

  Moreover, the determination means 3 produces | generates the negative determination information which shows that the stirring blade 12 is not located in the vicinity of the 1st earth pressure sensor 1a, when none of the conditions shown in (1)-(4) are materialized. The negative determination information is given to the earth pressure data acquired by the first earth pressure sensor 1a (for example, the flag “0” is associated with the earth pressure data acquired by the first earth pressure sensor 1a).

  When the condition (1) is satisfied, the reference cutter spoke 11a is positioned in the first data exclusion section Ra. When the conditions (2) to (4) are satisfied, the cutter spoke 11b to 11d is located in the first data exclusion section Ra.

The start point of the second data exclusion section Rb is set at a position rotated by an angle α _{b with} respect to the reference line S, and the end point of the second data exclusion section Rb is an angle β _{b with} respect to the reference line S. If it is set to a position rotated by (> α _b ), the determination means 3 determines that the second earth pressure sensor 1b when any one of the conditions shown in (5) to (8) is satisfied. Of the earth pressure obtained by the second earth pressure sensor 1b and the third earth pressure sensor 1c by generating affirmative determination information indicating that the stirring blade 12 is located in the vicinity of the earth earth pressure sensor 1c. Is given affirmative determination information (for example, the flag “1” is associated with the earth pressure data acquired by the second earth pressure sensor 1b and the third earth pressure sensor 1c).
(5) α _b <θ _a <β _b
(6) α _b +90 degrees <θ _a <β _b +90 degrees (7) α _b +180 degrees <θ _a <β _b +180 degrees (8) α _b +270 degrees <θ _a <360 degrees, or 0 ≦ θ _a < β _b −90 degrees

  Further, when none of the conditions shown in (5) to (8) is established, the determination means 3 is such that the stirring blades 12 are positioned in the vicinity of the second earth pressure sensor 1b and in the vicinity of the third earth pressure sensor 1c. Negative determination information indicating that the second earth pressure sensor 1b and the third earth pressure sensor 1c are acquired, and negative determination information is given to the earth pressure data acquired by the second earth pressure sensor 1c (for example, the second earth pressure sensor). The flag “0” is associated with the earth pressure data acquired by the 1b and the third earth pressure sensor 1c).

  When the condition (5) is satisfied, the reference cutter spoke 11a is located in the second data exclusion section Rb, and the cutter spoke 11c is located in the third data exclusion section Rc. When the condition is satisfied, the cutter spoke 11d is positioned in the second data exclusion section Rb, and the cutter spoke 11b is positioned in the third data exclusion section Rc. Similarly, when the condition (7) is satisfied, the cutter spoke 11c is positioned in the second data exclusion section Rb, and the cutter spoke 11a is positioned in the third data exclusion section Rc. When the condition is satisfied, the cutter spoke 11d is positioned in the second data exclusion section Rb, and the cutter spoke 11b is positioned in the third data exclusion section Rc.

  The display earth pressure data creation means 4 creates display earth pressure data to be displayed on the display means 5. The earth pressure data creation means 4 for display is the earth pressure data acquired when the determination result of the determination means 3 is affirmative among the earth pressure data group acquired by the earth pressure sensor 1 (that is, the affirmation determination information is obtained). Display using the earth pressure data acquired when the determination result of the determination means 3 is negative (that is, the earth pressure data to which negative determination information is added). Create soil pressure data.

More specifically, the earth pressure data creation means 4 for display is acquired by the first earth pressure sensor 1a when creating the earth pressure time history data at the installation position of the first earth pressure sensor 1a, for example. The earth pressure data group with the positive determination information is excluded from the earth pressure data group, and the earth pressure time history data (the earth pressure data for display) is used by using the earth pressure data group with the negative determination information. ). In this way, as shown in FIG. 3A, while the stirring blades 12a to 12d are located in the vicinity of the first earth pressure sensor 1a (time t _{a1 to} t _a2 , t _{a3 to} t _a4 , The earth pressure data for t _{a5 to} t _a6 and t _{a7 to} t _a8 ) are not displayed. The same applies to the creation of time history data of earth pressure at the installation positions of the second earth pressure sensor 1b and the third earth pressure sensor 1c. As shown in FIG. third earth pressure during stirring blades 12a~12d in the vicinity of the earth pressure sensor 1c) is located (time _{t b1 ~t b2, t b3 ~t} b4, t b5 ~t b6, t b7 ~t b8) Data will not be displayed.

  In addition, the display earth pressure data creating means 4 obtains the maximum earth pressure data and the minimum earth pressure data at the installation position of the first earth pressure sensor 1a during a certain period (for example, while the cutter head 11 makes one rotation), for example. When creating, the earth pressure maximum value data / minimum value data of the earth pressure is searched by searching the earth pressure data group to which the negative determination information is given from the earth pressure data group acquired by the first earth pressure sensor 1a. Create

  Further, the display earth pressure data creation means 4, for example, creates average earth pressure data in the chamber from among the three earth pressure data acquired from the earth pressure sensors 1 a, 1 b, 1 c at the same time. The earth pressure data to which the positive determination information is assigned is excluded, and the average earth pressure data is created using the earth pressure data to which the negative judgment information is assigned. That is, for example, the display earth pressure data creating means 4 gives affirmative determination information to the earth pressure data obtained by the first earth pressure sensor 1a, and is obtained by the second earth pressure sensor 1b and the third earth pressure sensor 1c. When negative determination information is given to the earth pressure data, the average earth pressure data is obtained by arithmetically averaging the two earth pressure data acquired by the second earth pressure sensor 1b and the third earth pressure sensor 1c. The negative determination information is given to the earth pressure data acquired by the first earth pressure sensor 1a, and the affirmation judgment information is given to the earth pressure data acquired by the second earth pressure sensor 1b and the third earth pressure sensor 1c. If there is, the earth pressure data acquired by the first earth pressure sensor 1a is output to the display means 5 as average earth pressure data.

  As described above, according to the earth pressure management device according to the present embodiment, when the determination result of the determining means 3 is affirmative (when the stirring blade 12 is turning in the vicinity of the earth pressure sensor 1), The earth pressure data acquired by the pressure sensor 1 is excluded from the earth pressure data for display. That is, according to the earth pressure management device according to the present embodiment, the earth pressure fluctuation due to the turning of the stirring blade 12 is not displayed, so that the earth pressure fluctuation due to factors other than the stirring blade 12 becomes relatively obvious. Therefore, for example, it is possible to easily grasp the earth pressure fluctuation or the like that affects the stable state of the face, and consequently, excavation management with high accuracy can be performed.

  In the present embodiment, the stirring blade 12 is not positioned in the vicinity of the second earth pressure sensor 1b and the third earth pressure sensor 1c while the stirring blade 12 is positioned in the vicinity of the first earth pressure sensor 1a, and The earth pressure sensors 1a to 1c are arranged so that the stirring blade 12 is not located near the first earth pressure sensor 1a while the stirring blade 12 is located near the second earth pressure sensor 1b and the third earth pressure sensor 1c. Therefore, it is possible to monitor the earth pressure fluctuation that affects the stable state of the face without any interruption.

DESCRIPTION OF SYMBOLS 1 Earth pressure sensor 2 Position sensor 3 Determination means 4 Display earth pressure data creation means 5 Display means 10 Shield machine 11 Cutter head 12 Agitation blade

Claims (1)

An earth pressure management device applied to a shield machine equipped with a stirring blade on the back of the cutter head,
An earth pressure sensor for measuring earth pressure in the chamber;
A position sensor for detecting the position of the stirring blade;
Based on the position data acquired by the position sensor, determination means for determining whether or not the stirring blade is positioned in the vicinity of the earth pressure sensor;
Display earth pressure data creating means for creating display earth pressure data to be displayed on the display means,
The display earth pressure data creation means excludes the earth pressure data acquired by the earth pressure sensor when the determination result of the determination means is affirmative in the earth pressure data group acquired by the earth pressure sensor. Then, the earth pressure management device is configured to create the earth pressure data for display using earth pressure data acquired by the earth pressure sensor when the determination result of the determining means is negative.

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