Jack pattern selection support method and selection support device

Abstract

To provide a selection support method and a selection support device of a jack pattern that can present an adequate jack pattern in short time.SOLUTION: A selection support method of a jack pattern is the method that supports selection of the jack pattern regulating an operational state of each jack on multiple jacks provided for propelling a shield excavator in an excavation direction. The selection support method outputs the jack pattern that makes a position difference between the power point of the propelling resultant force and a recommended power point set in advance smaller on the basis of a contribution degree of each jack relative to a power point of propelling resultant force of the jacks.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method and device for supporting the selection of a jack pattern for a shield jack used to propel a shield tunneling machine. [Background technology]

[0002] Conventionally, shield tunneling machines are used in tunnel excavation work using the shield method. Shield tunneling machines are equipped with shield jacks to drive the machines. Multiple shield jacks are usually placed at intervals around the periphery of the shield tunneling machine behind it. The operator controls the excavation direction of the shield tunneling machine by selecting whether or not to use each shield jack.

[0003] Controlling the excavation direction of a shield machine so that it follows the tunnel plan line has been problematic, requiring skill and difficulty. To solve this problem, the present patent applicant has already proposed a machine learning model, described in Patent Document 1, for estimating the position of the force point of the shield jack, which determines the excavation direction of the shield machine. Figure 4 shows an example of an operator screen displaying the recommended force point position recommended by an AI such as this machine learning model and the calculated target force point position of the current thrust resultant force. As shown in this figure, the operator checks the positions of the recommended force point and the target force point and selects the shield jack to be used so that it matches the target force point. This allows for appropriate control of the thrust direction of the shield machine.

[0004] On the other hand, the technology described in Patent Document 2 is known as a conventional technology relating to support for selecting a shield jack pattern. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-143385 [Patent Document 2] Patent Publication No. 2021-042584 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the conventional method of Patent Document 1 is applied, the following problems arise. First, it is difficult for the operator to determine which shield jack to set from among the many shield jacks in order to match the position of the recommended force point, and this may place a burden on the operator.

[0007] In addition, when searching all combinations of N shield jacks (N is an integer greater than or equal to 2, usually several tens) installed on a shield tunneling machine, the number of searches is 2 N This becomes a huge number, and 2 N It is necessary to calculate the jacking pattern for each street, which makes it difficult to select the jacking pattern in a realistic time frame.

[0008] Furthermore, there is a risk that the operator will select an inappropriate jacking pattern in order to match the displayed target force point. Figure 5 is a schematic diagram of jacking patterns, with shield jacks used for excavation indicated by black circles and shield jacks not used indicated by white circles. For example, a jacking pattern like Figure 5(a) may cause the stress generated by the shield jack to concentrate at the bottom, potentially damaging the segment (an inappropriate jacking pattern). On the other hand, a jacking pattern like Figure 5(b) does not concentrate stress in one area (an appropriate jacking pattern). Therefore, it is preferable to select a jacking pattern like Figure 5(b) rather than Figure 5(a).

[0009] The present invention has been made in view of the above, and has an object to provide a jack pattern selection support method and selection support device that can present appropriate jack patterns in a short period of time. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems and achieve the objectives, the jack pattern selection support method of the present invention is a method for supporting the selection of a jack pattern that defines the operating state of each of a plurality of jacks provided to propel a shield tunneling machine in the excavation direction, and is characterized by outputting a jack pattern that reduces the positional difference between the force point of the thrust resultant force and a predetermined recommended force point based on the contribution of each jack to the force point of the thrust resultant force of the jack.

[0011] In addition, the jack pattern selection support device of the present invention is a device that supports the selection of a jack pattern that specifies the operating state of each of a plurality of jacks provided to propel a shield tunneling machine in the excavation direction, and is characterized in that it outputs a jack pattern that reduces the positional difference between the force point of the thrust resultant force and a predetermined recommended force point based on the contribution of each jack to the force point of the thrust resultant force of the jack. [Effects of the Invention]

[0012] The jack pattern selection support method of the present invention is a method for supporting the selection of a jack pattern that determines the operating state of each of a plurality of jacks provided to propel a shield tunneling machine in the excavation direction, and outputs a jack pattern that reduces the difference in position between the force point of the resultant thrust force of the jack and a predetermined recommended force point based on the contribution of each jack to the force point of the resultant thrust force of the jack, thereby achieving the effect of being able to present an appropriate jack pattern to the operator in a short period of time.

[0013] In addition, the jack pattern selection support device of the present invention is a device that supports the selection of a jack pattern that specifies the operating state of each of a plurality of jacks provided to propel a shield tunneling machine in the excavation direction, and outputs a jack pattern that reduces the positional difference between the force point of the thrust resultant force and a predetermined recommended force point based on the contribution of each jack to the force point of the thrust resultant force of the jack, thereby achieving the effect of being able to present an appropriate jack pattern to the operator in a short period of time. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an explanatory diagram of a jack pattern selection support method and selection support device according to the present invention. [Figure 2] FIG. 2 is a diagram showing an example of jack arrangement. [Figure 3] FIG. 3 is a flowchart showing an embodiment of a jack pattern selection support method and selection support device according to the present invention. [Figure 4] FIG. 4 is a diagram showing an example of a conventional screen display of recommended emphasis points. [Figure 5] FIG. 5 shows an example of a conventional jacking pattern, where (a) is an inappropriate jacking pattern and (b) is an appropriate jacking pattern. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of a jack pattern selection support method and a selection support device according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments.

[0016] This invention supports the selection of a jack pattern that defines the operating state of each of multiple shield jacks provided to propel a shield machine in the excavation direction. The invention takes into account the contribution of each jack's resultant thrust force to the force point, and outputs, with a small number of searches, a jack pattern that reduces the absolute deviation between the position of the force point of the resultant thrust force and the position of a recommended force point (for example, an AI-predicted force point predicted by AI, etc.).

[0017] (Basic principle of the present invention) First, the basic principle of the present invention will be explained. It is assumed that 12 shield jacks are arranged circumferentially at equal intervals and symmetrically along the inner circumference of the rear side of the cylindrical shield that makes up the shield tunneling machine. When each shield jack is turned on, it receives a reaction force from the existing segment behind it and extends, propelling the shield tunneling machine forward. The on / off state of each shield jack can be switched by the operator or by operating a control device.

[0018] Figure 1(1) shows the jacking pattern in a coordinate plane. As shown in this figure, the horizontal line passing through the center point O of the shield tunneling machine is the axis e H Let the vertical downward line be the axis e V The jacks are placed at equal intervals on the circumference of a unit circle of radius 1, centered at the center point O of the shield tunneling machine.

[0019] The AI ​​predicted force point (recommended force point) predicted by the AI ​​is set as force point 1, and the line connecting force point 1 and the center point O of the shield tunneling machine is set as the axis of symmetry e M and the axis of symmetry e M The axis perpendicular to the axis of symmetry e N The axis of symmetry e M , e N The four parts divided by are called the first quadrant, second quadrant, third quadrant, and fourth quadrant in counterclockwise order from the top.

[0020] Considering the contribution of each jack to the force point of the thrust resultant force, the on / off states of the jacks on the first and second quadrants and the jacks on the third and fourth quadrants are on the symmetrical axis e.M The jack patterns can be searched for by using the jack groups in the first and second quadrants or the jack groups in the third and fourth quadrants. In this way, the number of jack pattern searches can be reduced to 2. N From 2 N / 2 It is possible to reduce it to

[0021] Furthermore, the axis of symmetry e N In contrast, the jacks at symmetrical positions in the first and second quadrants and the third and fourth quadrants are in the on state, and the contribution of the thrust resultant force to the force point is canceled out, so the number of jack patterns searched is 2 N / 2 From 2 N / 4 It is possible to reduce it to

[0022] By applying this invention, it is possible to select a jack pattern such as that shown in Figure 1(1). Also, as shown in Figure 1(2), a jack pattern can be selected in which the combination of jacks in the on / off state is different from that shown in (1). However, the position of force point 1 in Figure 1(1) is the same as the position of force point 2 in (2). Furthermore, from the perspective of preventing a jack pattern such as a one-sided pushing state from being output, it is desirable to select a jack pattern such as that shown in Figure 1(2), which guarantees that the minimum number of jacks used is N / 2 or more.

[0023] As shown in Figure 2(1), the jacks are arranged discretely in the circumferential direction, so the axis of symmetry e connecting the recommended force point M and the center point O of the shield tunneling machine is M It is desirable to arrange the axis of symmetry e so that it passes through the actual jack position or the midpoint between two adjacent jacks. M Central angle θ M (axis e V The angle between the force point M and the actual force point M may be fine-tuned for two cases, as shown in Figure 2(2) and Figure 2(3). Then, a jack pattern may be output that reduces the absolute value of the difference between the position of the force point of the thrust resultant force and the position of the recommended force point M.

[0024] In addition, in FIG. iis the placement angle of each jack, where i = 1,...,N (total number of jacks). Δθ is the difference in placement angle between adjacent jacks in the circumferential direction. Axis e' M is the axis of symmetry e after fine adjustment M The central angle θ M and jack placement angle θ i For example, axis e V The positive direction (vertically downward) can be set as the starting line (0°), and clockwise can be set as the positive direction.

[0025] (Embodiment) Next, an embodiment of a method for supporting selection of a jack pattern according to the present invention will be described. As shown in Figure 3 and Figure 2(1), first, connect the recommended force point M and the shield tunneling machine center point O on the coordinate plane with a straight line, and then draw the symmetry axis e M is created (step S1). Here, the recommended point of effort M is assumed to be set in advance. The recommended point of effort M may be a point of effort estimated using the machine learning model described in Patent Document 1, for example, or may be a point of effort set by other methods.

[0026] Next, for example, clockwise is the positive direction, and axis e V From the axis of symmetry e M Central angle θ M (Step S2), and the arrangement angle θ of each jack is calculated. i and the axis of symmetry e M Central angle θ M are compared (step S3).

[0027] Next, the inequality |θ M -θ i It is determined whether or not |≧Δθ / 4 is satisfied (step S4). If the determination result shows that it is satisfied (Yes in step S4), the process proceeds to step S5. On the other hand, if it is not satisfied (No in step S4), the process proceeds to step S7.

[0028] In step S5, the axis of symmetry e M It is determined that there is no jack arrangement above, and as shown in Figure 2 (2), the axis of symmetry e Mis finely adjusted so that it passes through the midpoint between the positions of jack number i and number i+1 (step S6). The axis of symmetry after fine adjustment is called axis e'. M Let's say.

[0029] On the other hand, in step S7, the axis of symmetry e M It is determined that there is a jack arrangement above, and as shown in Figure 2 (3), the axis of symmetry e M is finely adjusted so that it passes through the position of jack number i (step S8). The axis of symmetry after fine adjustment is axis e' M Let's say.

[0030] Next, after fine adjustment in step S6 (or step S8) above, the contribution Δe of the resultant thrust force per jack to the force point e is calculated from the number of jacks (N / 4). The contribution Δe is calculated, for example, by the following equation: Δe=cos(θ i ) / N. Then, taking this contribution Δe into consideration, a jacking pattern is calculated in which the distance |eM| between the force point e of the resultant thrust force and the recommended force point M is minimized (step S9). The calculation results are displayed on the operator's screen. Looking at this display, the operator can select the optimal jacking pattern for thrusting the shield machine in the specified planned direction.

[0031] Finally, it is determined whether or not to end the selection of the jack pattern (step S10), and if it is determined to end (Yes in step S10), the process ends. On the other hand, if it is determined not to end (No in step S10), the process returns to step S1, and the processes of steps S1 to S9 are repeated.

[0032] According to this embodiment, a jack pattern that reduces the difference in position between the force point of the thrust resultant force and a preset recommended force point is output based on the contribution of each jack to the force point of the thrust resultant force of all jacks. In other words, the force point to be selected can be converted into a jack pattern and presented to the operator. N The number of jack pattern searches is 2 N / 4By reducing the number of jacks to N, an appropriate jacking pattern is presented in a short time. This makes it possible to select a jacking pattern in a realistic time. In addition, the minimum number of jacks used is guaranteed to be N / 2 or more, which prevents the output of a jacking pattern that results in one side being pushed.

[0033] In this way, this embodiment takes into account the contribution of each jack to the force point of the resultant thrust force, making it possible to select a highly reliable jack pattern and control the excavation direction of the shield tunneling machine with stable precision while increasing accuracy.

[0034] Next, an embodiment of a jack pattern selection support device according to the present invention will be described. The jack pattern selection support device according to this embodiment is a device that embodies the above-described jack pattern selection support method, and is composed of, for example, an input unit, an output unit, and a calculation unit. The input unit is used to input the positional relationship between the recommended force point and the center point of the shield machine, the number of jacks, the jack placement angle, etc. The output unit is used to output jack patterns such as those shown in Figures 1(1) and 1(2) on a display screen in the operator's room, etc. The calculation unit is used to perform the processes in steps S1 to S10 above.

[0035] The input unit, output unit, and calculation unit can be configured using hardware such as a computer having a CPU, a memory, a display, and software such as a computer program that runs on this hardware.

[0036] According to this embodiment, a jack pattern that reduces the difference in position between the force point of the thrust resultant force and a preset recommended force point is output based on the contribution of each jack to the force point of the thrust resultant force of all jacks. In other words, the force point to be selected can be converted into a jack pattern and presented to the operator. N The number of jack pattern searches is 2 N / 4By reducing the number of jacks to N, an appropriate jacking pattern is presented in a short time. This makes it possible to select a jacking pattern in a realistic time. In addition, the minimum number of jacks used is guaranteed to be N / 2 or more, which prevents the output of a jacking pattern that results in one side being pushed.

[0037] As described above, the jack pattern selection support method of the present invention is a method for supporting the selection of a jack pattern that defines the operating state of each of a plurality of jacks provided to propel a shield tunneling machine in the excavation direction, and outputs a jack pattern that reduces the difference in position between the force point of the resultant thrust force of the jack and a predetermined recommended force point based on the contribution of each jack to the force point of the resultant thrust force of the jack, thereby making it possible to present an appropriate jack pattern to the operator in a short amount of time.

[0038] In addition, the jack pattern selection support device of the present invention is a device that supports the selection of a jack pattern that specifies the operating state of each of a plurality of jacks provided to propel a shield tunneling machine in the excavation direction, and outputs a jack pattern that reduces the positional difference between the force point of the thrust resultant force and a predetermined recommended force point based on the contribution of each jack to the force point of the thrust resultant force of the jack, so that an appropriate jack pattern can be presented to the operator in a short period of time. [Industrial Applicability]

[0039] As described above, the jack pattern selection support method and selection support device of the present invention are useful for setting jack patterns to control the jacks equipped on shield tunneling machines used in shield construction, and are particularly suitable for presenting appropriate jack patterns in a short period of time.

Claims

1. A method for supporting selection of a jack pattern that defines the operating state of each of a plurality of jacks that are provided to propel a shield machine in an excavation direction and are arranged at equal intervals on the circumference of a circle centered on a center point of the shield machine, comprising: In a coordinate plane formed by a horizontal axis passing through the center point, a vertical axis, and the position of the jack, a symmetry axis is set by a line connecting a preset recommended force point and the center point; A method for supporting selection of a jack pattern, characterized in that the axis of symmetry is fine-tuned so that it passes through the position of the jack or the midpoint between two circumferentially adjacent jacks, and by utilizing the fact that the on / off states of the jack on one side of the two parts divided by the axis of symmetry and the jack on the other side are symmetrical with respect to the axis of symmetry, the jack pattern is searched for using either a combination of the on / off states of the jack on one side or a combination of the on / off states of the jack on the other side.

2. A device for assisting in the selection of a jack pattern that defines the operating state of each of a plurality of jacks that are arranged at equal intervals on the circumference of a circle centered on the center point of the shield machine and that is provided for propelling the shield machine in the excavation direction, comprising: a means for setting an axis of symmetry by a line connecting a preset recommended force point and the center point on a coordinate plane formed by a horizontal axis passing through the center point, a vertical axis, and the position of the jack; A jack pattern selection support device characterized by comprising a means for fine-tuning the axis of symmetry so that it passes through the position of the jack or the midpoint between two circumferentially adjacent jacks, and by utilizing the fact that the on / off states of the jack on one side of the two parts divided by the axis of symmetry and the jack on the other side are symmetrical with respect to the axis of symmetry, searching for the jack pattern using either a combination of the on / off states of the jack on one side or a combination of the on / off states of the jack on the other side.

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