Tunnel construction management method and tunnel construction management system

Abstract

To reduce energy consumption and improve productivity in a tunnel construction using a tunnel boring machine, in response to on-site needs and ground conditions.SOLUTION: A tunnel construction management method using a tunnel boring machine that excavates natural ground by rotating a cutter head comprises steps of: selecting one of a power management step for managing power consumption, a wear management step for managing the amount of wear on a cutter bit, and an excavation management step for managing the excavation speed; continuously measuring cutter torque while excavating the natural ground with the tunnel boring machine and periodically calculating a representative torque value; and controlling the cutter rotation speed at which the cutter head rotates while monitoring the representative torque value with excavating the natural ground with the tunnel boring machine, thereby selecting the selected management step.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a construction management method and a construction management system for tunnel construction using a tunnel boring machine that excavates natural ground by rotating a cutter head. [Background technology]

[0002] Tunnel construction often involves the use of tunnel boring machines such as shield machines and TBMs. At the tip of the tunnel boring machine is a cutter head equipped with a cutter bit embedded with cemented carbide, and while rotating this cutter head, the cutter bit cuts the ground and excavates.

[0003] In order to operate and manage such a tunnel boring machine, various mechanical parameters are measured to obtain construction data. Among them, cutter torque, tunneling speed, and cutter rotation speed are basic measurement items, and the tunnel boring machine is operated while controlling these.

[0004] For example, Patent Document 1 discloses an excavation control system for a shield machine that automatically controls the cutter rotation speed. Specifically, the excavation control system includes a control means for controlling the cutter rotation speed based on the cutting depth of the bit (bit penetration amount) and the excavation speed of the shield machine. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-282784 A Summary of the Invention [Problem to be solved by the invention]

[0006] Generally, when the excavation speed is constant and the cutter torque falls below the equipment torque, the cutter rotation speed increases. In such a case, since there is no problem with the operation of the tunnel boring machine, the machine is usually operated to maintain this cutter rotation speed. However, since the cutter rotation speed affects the amount of power consumption and the amount of wear on the cutter bit, this creates an issue in terms of economy. In addition, if the ground conditions change temporarily during excavation, the excavation speed is likely to become unstable, creating an issue in productivity.

[0007] The present invention has been made in consideration of such problems, and its main objective is to reduce power consumption and improve productivity in tunnel construction using a tunnel boring machine, in response to on-site needs and ground conditions. [Means for solving the problem]

[0008] In order to achieve this object, the tunnel construction management method of the present invention is a method for managing tunnel construction using a tunnel boring machine that rotates a cutter head to excavate the natural ground, and is characterized by the steps of selecting one of a power management process for managing power consumption, a wear management process for managing the amount of wear on the cutter bit, and an excavation management process for managing the excavation speed, continuously measuring the cutter torque while excavating the natural ground with the tunnel boring machine and periodically calculating a representative torque value, and controlling the cutter rotation speed at which the cutter head rotates while monitoring the representative torque value while excavating the natural ground with the tunnel boring machine, thereby executing the selected management process.

[0009] The tunnel construction management method of the present invention is characterized in that the management process is selected each time one segment ring is excavated.

[0010] The tunnel construction management method of the present invention is characterized in that, in the power management process, the cutter rotation speed is increased or decreased within a range in which the torque representative value does not exceed a torque threshold value set based on the equipment torque, thereby reducing power consumption.

[0011] The tunnel construction management method of the present invention is characterized in that, in the wear management process, the cutter rotation speed is reduced within a range in which the torque representative value does not exceed a torque threshold value set based on the equipment torque, thereby reducing the sliding distance of the cutter bit.

[0012] The tunnel construction management method of the present invention is characterized in that, in the excavation management process, when the torque representative value exceeds a torque threshold value set based on the equipment torque, the cutter rotation speed is increased to reduce the torque representative value to a range that does not exceed the torque threshold value, and then the cutter rotation speed is maintained and the excavation speed is stabilized.

[0013] The tunnel construction management system of the present invention is a construction management system for tunnel construction using a tunnel boring machine that excavates the natural ground by rotating a cutter head, and is characterized in that it comprises a torque processing unit that continuously measures cutter torque while excavating the natural ground with the tunnel boring machine and periodically calculates a torque representative value, a power management unit that controls the cutter rotation speed while monitoring the torque representative value and manages power consumption, a wear management unit that controls the cutter rotation speed while monitoring the torque representative value and manages the amount of wear on the cutter bit, and an excavation management unit that controls the cutter rotation speed while monitoring the torque representative value and manages the excavation speed.

[0014] According to the tunnel construction management method and construction management system of the present invention, the representative torque value can be monitored while the tunnel boring machine is excavating the ground, and the cutter rotation speed can be optimally controlled in accordance with one of the management processes selected by the construction manager.

[0015] As a result, if power management is selected, it is possible to conserve energy. Furthermore, if wear management is selected, it is possible to extend the life of the cutter bit. As a result, it is possible to reduce the cost of bit replacement, shorten the construction period, and improve worker safety. Furthermore, if excavation management is selected, it is possible to stabilize the excavation speed without being affected by temporary changes in ground conditions. Therefore, it can contribute to shortening the construction period and improving productivity of the entire tunnel construction work.

[0016] The above management process may be selected for each segment ring excavation. In this way, even if the tunnel construction is long and the ground conditions and construction conditions change as the construction progresses, it becomes possible to implement the optimal construction management according to the situation. Effect of the Invention

[0017] According to the present invention, the representative torque value can be monitored while the tunnel boring machine is excavating the ground, and the cutter rotation speed can be optimally controlled in accordance with any one of the management processes: power management, wear management or excavation management, making it possible to reduce power consumption and improve productivity in tunnel construction using a tunnel boring machine. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram of a tunnel boring machine according to the present invention. [Diagram 2] FIG. 2 is a diagram showing management items for tunnel construction according to the present invention. [Diagram 3] FIG. 1 is a diagram showing a construction management system of the present invention. [Figure 4] FIG. 1 is a flow chart showing an outline of the construction management method of the present invention. [Diagram 5] FIG. 1 is a flow diagram of the power saving mode (power management process) of the present invention. [Figure 6] FIG. 2 is a flow diagram of the bit life extension mode (wear management process) of the present invention. [Figure 7] FIG. 2 is a diagram showing a construction management method for the stable excavation mode (excavation management process) of the present invention. [Figure 8] FIG. 13 is a diagram showing an example of a monitor display of evaluation results obtained by the construction management method of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The present invention relates to a construction management method and a construction management system for tunnel construction using a tunnel boring machine. The tunnel boring machine used in tunnel construction may be any of a shield machine and a TBM (Tunnel Boring Machine) as long as it rotates a cutter head to excavate natural ground. In this embodiment, a shield machine equipped with a spoke-type cutter head is taken as an example, and its details will be described with reference to Figs. 1 to 8. Prior to this, an outline of the shield machine will be described first.

[0020] <<Outline of the Shield Tunneling Machine 10 and Shield Construction>> 1, the shield tunneling machine 10 is equipped with a cutter drive electric motor 11, a cutter head 12 whose front face faces the tunnel face A, a shield body 13, a cutter bit 14, a chamber 15, a screw conveyor 16, a shield jack 17, and rear equipment 18. In addition, the cutter drive electric motor 11 is provided with a sensor 111 that detects the cutter rotation speed (the rotation speed of the cutter head 12).

[0021] 2, the cutter head 12 is formed in a circular shape when viewed from the face A side, and has a plurality of cutter spokes 121 extending radially from a central axis. A plurality of cutter bits 14, which are metal excavation tools, are attached to the surface of the cutter spokes 121 facing the face A.

[0022] 1, a chamber 15 is provided in a space partitioned by the cutter head 12, a hood portion 131 which is a cylindrical outer shell located on the front side (face A side) of the shield body 13, and a partition wall 132. The chamber 15 takes in excavated soil S which is continuously generated by the shield machine 10 excavating the natural ground, and the taken-in excavated soil S is discharged into the tunnel T via a screw conveyor 16 connected to the partition wall 132.

[0023] On the other hand, a plurality of shield jacks 17 are provided on the tail side of the shield body 13. The shield jacks 17 are extended while pressing a shoe against a segment ring 20, which is made by assembling a plurality of segments 21 continuously in the circumferential direction using an erector (not shown), and press the cutter head 12 against the face A.

[0024] The shield tunneling machine 10 cuts the tunnel face A by rotating the cutter head 12 while pressing it against the tunnel face A with the shield jack 17. In addition, the rod of the shield jack 17 is extended by the amount cut by the cutter head 12, and a reaction force is obtained from the segment ring 20 to obtain a propulsive force.

[0025] After the shield machine 10 has excavated in this manner, the rod of the shield jack 17 is contracted to form a space between the segment ring 20 and the shield jack. An erector is then used to assemble a new segment ring 20 in this space. Shield construction involves repeating the above process to sequentially connect the segment rings 20, thereby constructing a tunnel lining underground.

[0026] <<Construction Management System>> The construction management system 100 is a system that introduces a management mode (management process) selected by the construction manager from among a power saving mode (power management process), a bit life extension mode (wear management process), and a stable excavation mode (excavation management process) in the construction of a tunnel using the above-mentioned shield machine 10. An outline of the three management modes (management processes) is shown in Figure 2.

[0027] <Mode 1: Power saving mode (power management process)> The power saving mode is a mode for reducing power supplied to the cutter drive electric motor 11 by optimally controlling the cutter rotation speed when the representative value of the cutter torque falls below an allowable value (hereinafter referred to as the "torque threshold value"), thereby achieving power saving. For example, when the ground is soft and the load factor of the cutter torque is low, the cutter rotation speed is reduced within a range in which the representative value of the cutter torque (hereinafter referred to as the "torque representative value") does not exceed the torque threshold value. In addition, when the ground is hard and the load factor of the cutter torque is high, the cutter rotation speed is increased, for example, to manage power consumption.

[0028] <Mode 2: Bit life extension mode (wear management process)> The bit life extension mode is a mode in which, when the torque representative value falls below the torque threshold value, the cutter rotation speed is optimally controlled to shorten the sliding distance of the cutter bit 14 and extend the life of the cutter bit 14. For example, when the ground is soft and the load rate of the cutter torque is low, the cutter rotation speed is reduced within a range in which the cutter torque does not exceed the torque threshold value, and the wear amount of the cutter bit 14 is managed.

[0029] <Mode 3: Stable Excavation Mode (Excavation Management Process)> The stable excavation mode is a mode that aims to stabilize the excavation speed by optimally controlling the cutter rotation speed when the ground temporarily becomes hard and the torque representative value exceeds the torque threshold. After increasing the cutter rotation speed to reduce the torque representative value to a range that does not exceed the torque threshold, the excavation speed is maintained while excavating, thereby managing the excavation speed to be constant.

[0030] The construction management system 100 that realizes these three types of management modes is composed of a cutter driving device 30, an excavation management system 40, and an information processing device 50, as shown in FIGS.

[0031] <Cutter drive device 30> 1, the cutter driving device 30 is provided on the shield tunneling machine 10. For example, it is mounted on the rear facility 18 and includes an inverter board 31 and a motor side control device 32.

[0032] The inverter board 31 controls the rotation speed of the cutter drive electric motor 11 , and is connected to the cutter drive electric motor 11 and a motor side control device 32 .

[0033] 3, the motor-side control device 32 includes an input unit 321, an output unit 322, a calculation unit 323, and a storage unit 324. The cutter rotation speed detected by the sensor 111 and measurement values ​​related to the cutter drive electric motor 11 output from the inverter board 31 are acquired via the input unit 321. The measurement values ​​output from the inverter board 31 include, for example, the frequency, voltage value, current value, power, cutter torque value, etc.

[0034] Hereinafter, the cutter rotation speed detected by the above sensor 111, the measurement values ​​related to the cutter drive electric motor 11 output from the inverter panel 31, as well as the excavation speed and ground conditions, and other measurement data and information generally measured during construction management of the shield tunneling machine 10 will be collectively referred to as "excavation data."

[0035] <Excavation Management System 40> As shown in Figures 1 and 3, the excavation management system 40 is installed in the shield machine 10 or in a construction management office, etc., and includes a management control device 41 and a management monitor 42.

[0036] The management side control device 41 employs, for example, a PLC (Programmable Logic Controller) or the like, and includes an input unit 411, an output unit 412, a calculation unit 413, and a storage unit 414. Information such as the above-mentioned excavation data is acquired from the information processing device 50 and the motor side control device 32 via the input unit 411. In addition, the acquired information and calculation results are output to the management monitor 42 and the information processing device 50 via the output unit 412.

[0037] <Information processing device 50> The information processing device 50 is installed in the shield tunneling machine 10 or in a construction management office, etc., and can be any device equipped with an input unit 51, an output unit 52, a calculation processing unit 53 and a memory unit 54, and a personal computer, notebook PC, tablet terminal, etc. can be used.

[0038] Although not shown, the input unit 51 is connected to input devices such as a keyboard, mouse, and scanner, as well as to the management control device 41, and acquires various information input from these. The output unit 52 outputs information such as the above-mentioned excavation data acquired via the input unit 51 and processing data processed by the arithmetic processing unit 53 to the management control device 41, the memory unit 54, or a display device (not shown), etc.

[0039] The calculation processing unit 53 has memory areas such as a CPU (Central Processing Unit), ROM (Read Only Memory) and RAM (Random Access Memory), and has at least a torque processing unit 531, a power management unit 532, a wear management unit 533, an excavation management unit 534, and an evaluation calculation unit 535.

[0040] The torque processing unit 531 calculates a torque representative value from the cutter torque values ​​continuously input via the motor-side control device 32 and the management-side control device 41. The torque representative value may be any of the average value, median value, and mode value of the cutter torque. The cutter torque is a transmission force required for excavating the natural ground with the cutter bit 14.

[0041] The power management unit 532 manages power consumption by controlling the cutter rotation speed while monitoring the torque representative value. The wear management unit 533 manages the amount of wear on the cutter bit 14 by controlling the cutter rotation speed while monitoring the torque representative value. The excavation management unit 534 controls the cutter rotation speed while monitoring the torque representative value, and keeps the excavation speed of the shield machine 10 constant.

[0042] The power management unit 532, wear management unit 533, and excavation management unit 534 each execute their own processes according to the selection made by the construction manager, and when the power saving mode is selected, the power management unit 532 executes its processes. When the bit life extension mode is selected, the wear management unit 533 executes its processes. When the stable excavation mode is selected, the excavation management unit 534 executes its processes.

[0043] The evaluation calculation unit 535 executes processing of either the power management unit 532, the wear management unit 533, or the excavation management unit 534 to numerically evaluate the effect of excavating the natural ground based on the excavation data before and after the cutter rotation speed is changed.

[0044] <<Outline of construction management method>> An outline of the procedure for implementing construction management of a tunnel construction project using the above-mentioned construction management system 100 will be described with reference to the flow diagram of Fig. 4. Note that an example will be given in which an average torque value is used as the representative torque value.

[0045] <Preparation: STEP 1> Prior to carrying out tunnel construction work, a plurality of arithmetic expressions for calculating the cutter rotation speed are obtained for each of the three types of management modes and stored in the memory unit 54 of the information processing device 50.

[0046] The calculation formula is obtained by acquiring multiple pieces of past construction performance data, performing regression analysis using the construction performance data for each construction site, and adopting the regression formula obtained as a result of the analysis. The regression formula extracts data that matches the purpose of the management mode from the construction performance data, sets this as the explanatory variable, and sets the cutter rotation speed as the objective variable. The construction performance data includes all data acquired during construction, such as cutter torque, cutter rotation speed, sliding distance of the cutter bit 14, power consumption of the cutter drive electric motor 11, and excavation speed, which are generally handled in the construction management of the shield tunneling machine 10.

[0047] By preparing multiple regression equations for each of the three management modes, the system can select from among the multiple regression equations a regression equation obtained based on past construction results that are similar to the soil conditions and construction data at the site during construction, thereby allowing the system to calculate the optimal cutter rotation speed.

[0048] <Select management mode and start excavation: STEP 2> The construction manager selects one of the management modes from the power saving mode, the bit life extension mode, or the stable excavation mode, and inputs the selected information into the information processing device 50 via the input unit 51.

[0049] Simultaneously with or around the time the management mode is selected, the shield tunneling machine 10 starts excavating. The excavation speed is controlled to be constant. When excavation of the construction section begins, the shield tunneling machine 10 is operated and managed in accordance with the design (such as the excavation instructions prepared at the time of planning the excavation). In addition, excavation data measured during excavation is continuously input to the information processing device 50 and stored in the memory unit 54 of the information processing device 50.

[0050] In this way, when the selection information for the management mode is input and the input of excavation data begins, the calculation processing unit 53 receives a command based on the input information from either the power management unit 532, the wear management unit 533, or the excavation management unit 534, and optimally controls the cutter rotation speed for each selected management mode. The general procedure is as follows.

[0051] <Monitoring cutter torque: STEP 3> First, a torque average value is periodically calculated by an arbitrary calculation method from the cutter torque values ​​that are continuously input to the information processing device 50. The torque average value thus calculated is compared with a torque threshold value to monitor the torque average value, and control such as changing the cutter rotation speed is performed.

[0052] The torque threshold is an allowable value for the cutter torque that is set according to the performance of the shield tunneling machine 10, ground conditions, etc., and is set appropriately by the construction manager taking into consideration the equipment torque of the shield tunneling machine 10. The torque threshold may be stored in memory unit 54 of the information processing device 50 via input unit 51 at the time of advance preparation (STEP 1), or may be input to the information processing device 50 after the shield tunneling machine 10 has started tunneling and the actual measured value of the cutter torque has been confirmed.

[0053] <Calculating the cutter rotation speed: STEP 4> As explained in the advance preparation (STEP 1), first, from among the multiple regression equations prepared for each management mode, select a regression equation obtained based on past construction results with similar soil conditions and construction data to the current construction site. Next, calculate the cutter rotation speed using this selected regression equation.

[0054] The substitution value to be input into the regression equation is a representative value (e.g., average value, median value, or mode value) for a certain time or a certain excavation distance in the excavation data continuously input to the information processing device 50 via the motor side control device 32 and the management side control device 41.

[0055] The cutter rotation speed calculated in this manner is input to the memory unit 414 of the management side control device 41 via the output unit 52, and is also input to the motor side control device 32 via the output unit 412. The motor side control device 32 calculates the frequency and voltage that will realize the input cutter rotation speed, and outputs them to the inverter board 31.

[0056] <<Change the rotation speed and excavate: STEP 5>> The inverter board 31 of the cutter driving device 30 varies the AC power so that it becomes the frequency and voltage input from the management control device 41, and supplies it to the cutter driving electric motor 11. The cutter driving electric motor 11 is driven at this varied frequency and voltage, thereby changing the cutter rotation speed.

[0057] While the shield machine 10 continues to excavate with the cutter rotation speed changed in this way, excavation data is continuously input to the information processing device 50 via the motor-side control device 32 and the management-side control device 41. The calculation processing unit 53 then receives a command from the evaluation calculation unit 535 and performs an evaluation as a result of the change in cutter rotation speed. The evaluation result is input to the management-side control device 41 of the excavation management system 40 via the output unit 52.

[0058] The management side control device 41 outputs the evaluation result input from the information processing device 50 to the management monitor 42 via the output unit 412. The evaluation result is not necessarily stored in the management monitor 42, but may be stored in the storage unit 54 of the information processing device 50 and displayed on a display device such as a display connected to the information processing device 50.

[0059] <Assembly of Excavation Stop and Segment Ring: STEP 6> When one stroke of the shield jack 17 has been completed, the operation of the shield tunneling machine 10 is temporarily stopped and the rod of the shield jack 17 is contracted to form a space between the segment ring 20. This space is used to assemble a new segment ring 20, and the shield tunneling machine 10 resumes excavation.

[0060] The on-site construction manager may select the same construction management mode for the following stroke as for the preceding stroke, or may select a different management mode for the following stroke. The same work is repeated until the tunnel construction is completed.

[0061] <<How to calculate the number of rotations for each of the three control modes (control processes)>> In the above construction management method, the detailed procedures of STEP 3 to STEP 5 differ for each of the three management modes. Below, the details of STEP 3 to STEP 5 are explained for each of the power saving mode (power management process), bit life extension mode (wear management process), and stable excavation mode (excavation management process).

[0062] <<Power saving mode (power management process)>> When the construction manager inputs information corresponding to the power saving mode into the input unit 51 of the information processing device 50, the calculation processing unit 53 receives a command from the power management unit 532 and calculates the cutter rotation speed in the following procedure. The procedure will be described with reference to the flow chart in Fig. 5.

[0063] <Monitoring cutter torque: STEP 3> First, during excavation work by the shield machine 10, the cutter torque value output from the inverter panel 31 is continuously input to the information processing device 50 via the motor-side controller 32 and the management-side controller 41. In response to a command from the torque processing unit 531, the calculation processing unit 53 of the information processing device 50 periodically calculates an average torque value and stores it in the memory unit 54.

[0064] Any interval may be used for calculating the average torque value, but for example, the average of cutter torque values ​​continuously acquired every time the shield machine 10 excavates 50 mm is calculated. Alternatively, the average of cutter torque values ​​acquired during the most recent 50 mm of excavation is calculated every 5 minutes that the shield machine 10 excavates.

[0065] Once the torque average value has been calculated, the calculation processing unit 53 of the information processing device 50, in response to a command from the power management unit 532, compares and monitors the torque average value against a torque threshold. The torque threshold is an allowable value for the cutter torque that is set according to the performance of the shield tunneling machine 10, ground conditions, etc., as described above, and is set to, for example, 70% of the equipment torque.

[0066] <Calculating the cutter rotation speed: STEP 4> If the average torque value is equal to or less than the torque threshold value, a regression equation obtained based on past construction work results with similar soil conditions and excavation data is selected from multiple regression equations stored in the memory unit 54. The regression equation used in the power saving mode is obtained by performing multiple regression analysis using at least the soil conditions, cutter torque, and the power value of the cutter drive electric motor 11 as explanatory variables and the cutter rotation speed as the objective variable.

[0067] Using this selected regression equation, the cutter rotation speed that can reduce the power value the most while keeping the torque value below the torque threshold value is calculated. The substitution value for the explanatory variable can be a representative value of the excavation data obtained continuously for a certain time or a certain excavation distance, for example, the average value of the most recent 50 mm.

[0068] On the other hand, if the average torque value exceeds the torque threshold value, the cutter rotation speed is changed experimentally to excavate the shield machine 10, and the average torque value is calculated from the continuously obtained cutter torque values. For example, the average torque value is obtained when the cutter rotation speed is increased to 105% of the design speed and excavated for one minute, and when it is reduced to 95% of the design speed and excavated for one minute. In addition to these operations, the amount of power supplied from the inverter panel 31 to the cutter drive electric motor 11 may be checked to see whether a power saving effect can be expected.

[0069] The procedure for varying the cutter rotation speed to cause the shield machine 10 to excavate is to input the set cutter rotation speed into the information processing device 50 via the input unit 51, and then input it from the output unit 52 to the motor-side control device 32 of the cutter driving device 30 via the management-side control device 41. As described above, the frequency and voltage that will achieve the input cutter rotation speed are calculated and output to the inverter panel 31.

[0070] In this way, the shield machine 10 is caused to excavate for a fixed period of time at the calculated cutter rotation speed. Then, excavation data is continuously input to the information processing device 50 via the motor-side control device 32 and the management-side control device 41. An average torque value is calculated from the cutter torque value contained in this excavation data.

[0071] When the average torque value falls below the torque threshold value, a regression equation obtained based on past construction work with similar soil conditions and construction data is selected from the multiple regression equations stored in memory unit 54, and this selected regression equation is used to calculate the cutter rotation speed that can reduce the power value the most while keeping the torque value below the torque threshold value.

[0072] <<Change the rotation speed and excavate: STEP 5>> The cutter rotation speed calculated by the above procedure is stored in the memory unit 54 and is input from the output unit 52 to the motor side control unit 32 of the cutter driving device 30 via the management side control device 41. As described above, the frequency and voltage that realize the input cutter rotation speed are calculated and output to the inverter board 31.

[0073] In this way, the cutter rotation speed is changed while continuing excavation work by the shield machine 10. Then, excavation data is continuously input to the information processing device 50 via the motor-side control device 32 and the management-side control device 41. In response to a command from the evaluation calculation unit 535, the calculation processing unit 53 performs an evaluation as a result of changing the cutter rotation speed.

[0074] In the power saving mode, the power consumption before and after changing the cutter rotation speed is calculated and stored in the memory unit 54, and is also output from the output unit 52 to the management monitor 42 via the management side control device 41. For example, in Fig. 8(a), the power consumption before changing the cutter rotation speed is called the design rotation speed power consumption, and the power consumption after changing the rotation speed is called the optimal control power consumption, and the reduction effect is displayed.

[0075] <<Bit life extension mode (wear management process)>> When the construction manager inputs information corresponding to the bit life extension mode into the input unit 51 of the information processing device 50, the calculation processing unit 53 receives a command from the wear management unit 533 and calculates the cutter rotation speed in the following procedure. The procedure will be described with reference to the flow chart in Fig. 6.

[0076] <Monitoring cutter torque: STEP 3> First, during excavation work by the shield machine 10, the cutter torque value output from the inverter panel 31 is continuously input to the information processing device 50 via the motor-side controller 32 and the management-side controller 41. In response to a command from the torque processing unit 531, the calculation processing unit 53 of the information processing device 50 periodically calculates an average torque value and stores it in the memory unit 54.

[0077] The interval for calculating the average torque value may be set to approximately the same as that for the power saving mode, and for example, the average of cutter torque values ​​continuously acquired every time the shield tunneling machine 10 excavates 50 mm is calculated. Alternatively, every time the shield tunneling machine 10 excavates for 5 minutes, the average of cutter torque values ​​acquired during the most recent 50 mm of excavation is calculated.

[0078] When the torque average value is calculated, the calculation processing unit 53 of the information processing device 50 receives a command from the wear management unit 533 to compare and monitor the torque average value with a torque threshold value. The torque threshold value may be set to the same level as in the power saving mode, for example, 70% of the equipment torque.

[0079] <Calculating the cutter rotation speed: STEP 4> If the torque average value is equal to or less than the torque threshold value, a regression equation obtained based on past construction results with similar soil conditions and excavation data is selected from multiple regression equations stored in the memory unit 54. The regression equation used in the bit life extension mode is obtained by performing multiple regression analysis using at least the soil conditions, cutter torque, and sliding distance of the cutter bit 14 as explanatory variables and the cutter rotation speed as the objective variable.

[0080] Using this selected regression equation, the cutter rotation speed that minimizes the sliding distance while keeping the torque value below the torque threshold is calculated. The substitution value for the explanatory variable can be a representative value of the excavation data obtained continuously for a certain time or a certain excavation distance, for example, the average value of the most recent 50 mm.

[0081] On the other hand, if the torque average value is equal to or greater than the torque threshold value, the ground is expected to be hard and it is inappropriate to reduce the cutter rotation speed. Therefore, the cutter rotation speed is maintained at the current state and excavation is continued.

[0082] <<Change the rotation speed and excavate: STEP 5>> The cutter rotation speed calculated by the above procedure is stored in the memory unit 54 and is input from the output unit 52 to the motor side control unit 32 of the cutter driving device 30 via the management side control device 41. As described above, the frequency and voltage that realize the input cutter rotation speed are calculated and output to the inverter board 31.

[0083] In this way, the cutter rotation speed is changed for optimal control while continuing excavation work by the shield machine 10. Then, excavation data is continuously input to the information processing device 50 via the motor-side control device 32 and the management-side control device 41. In response to a command from the evaluation calculation unit 535, the calculation processing unit 53 performs an evaluation as a result of changing the cutter rotation speed.

[0084] In the bit life extension mode, for example, the sliding distance of the cutter bit 14 before and after changing the cutter rotation speed is calculated and stored in the memory unit 54, and is also output from the output unit 52 to the management monitor 42 via the management side control device 41. For example, in Fig. 8(b), the sliding distance per hour before changing the cutter rotation speed is called the designed sliding distance, and the sliding distance per hour after changing the rotation speed is called the optimal control pivot distance, and the reduction effect is displayed.

[0085] ≪≪Stable excavation mode (excavation management process)≫≫ When the construction manager inputs information corresponding to the stable excavation mode into the input unit 51 of the information processing device 50, the calculation processing unit 53 receives a command from the excavation management unit 534 and calculates the cutter rotation speed in the following procedure. The procedure will be explained with reference to the flow chart in Fig. 7.

[0086] <Monitoring cutter torque: STEP 3> First, during excavation work by the shield machine 10, the cutter torque value output from the inverter panel 31 is continuously input to the information processing device 50 via the motor-side controller 32 and the management-side controller 41. In response to a command from the torque processing unit 531, the calculation processing unit 53 of the information processing device 50 periodically calculates an average torque value and stores it in the memory unit 54.

[0087] The interval for calculating the torque average value is set to a shorter time than in the power saving mode and the bit life extension mode. For example, the average of the cutter torque values ​​obtained during excavation is calculated every 10 seconds that the shield machine 10 excavates.

[0088] When the torque average value is calculated, the calculation processing unit 53 of the information processing device 50 receives a command from the excavation management unit 534 to compare and monitor the torque average value with a torque threshold value. The torque threshold value is set to a larger value compared to the power saving mode and bit life extension mode, for example, set to 80% of the equipment torque.

[0089] <Calculating the cutter rotation speed: STEP 4> If the torque average value is equal to or less than the torque threshold value, excavation is continued while maintaining the current cutter rotation speed. This is because the excavation is in a state of excavating soft ground, and stable excavation can be achieved without changing the cutter rotation speed. Therefore, excavation is performed for one stroke (one ring of the segment ring) with the shield machine 10 while maintaining the current cutter rotation speed.

[0090] On the other hand, if the torque average value is equal to or greater than the torque threshold value, a regression equation obtained based on past construction work with similar soil conditions and excavation data is selected from multiple regression equations stored in the memory unit 54. The regression equation used in the stable excavation mode is obtained by performing multiple regression analysis using at least the soil conditions and cutter torque as explanatory variables and the cutter rotation speed as the objective variable.

[0091] Using this selected regression equation, the cutter rotation speed at which the torque average value is equal to or less than the torque threshold value is calculated. The most recent excavation data is used, for example, as the substitution value for the explanatory variable. The calculated cutter rotation speed is stored in the memory unit 54 and input from the output unit 52 to the motor side control device 32 of the cutter driving device 30 via the management side control device 41. As described above, the frequency and voltage that realize the input cutter rotation speed are calculated and output to the inverter board 31.

[0092] In this way, the shield tunneling machine 10 is caused to excavate at the calculated cutter rotation speed for a fixed period of time (e.g., 60 seconds). Then, excavation data is continuously input to the information processing device 50 via the motor-side control device 32 and the management-side control device 41. The average torque value is calculated from the cutter torque value contained in this excavation data. Calculation of the cutter rotation speed using the regression equation is repeated until the average torque value becomes equal to or less than the torque threshold value, and the cutter rotation speed at which the average torque value becomes equal to or less than the torque threshold value is detected.

[0093] <<Change the rotation speed and excavate: STEP 5>> By continuing excavation work by the shield machine 10 at the cutter rotation speed detected by the above procedure, excavation for one stroke (one ring of the segment rings) is performed while maintaining a state in which the average torque is below the torque threshold value. Then, excavation data is continuously input to the information processing device 50 via the motor-side control device 32 and the management-side control device 41. The calculation processing unit 53 receives a command from the evaluation calculation unit 535 and performs an evaluation due to the change in the cutter rotation speed.

[0094] In the stable excavation mode, for example, the excavation loss reduction rate is calculated based on the excavation distance and time by changing the cutter rotation speed, and this is stored in the memory unit 54 and output from the output unit 52 to the management monitor 42 via the management control device 41. For example, in Figure 8 (c), the excavation distance by changing the cutter rotation speed is called the optimal control excavation section distance, and the time loss expected when excavating one stroke without changing the cutter rotation speed is called the expected loss due to reduced excavation speed, and these are displayed on the management monitor 42.

[0095] Moreover, the time-saving effect achieved by increasing the cutter rotation speed and excavating one stroke is called the stable excavation effect, and is displayed on the management monitor 42. Figure 8(c) shows an example in which the stable excavation effect is displayed by accumulating the time-saving effect (minutes) of all rings excavated in the stable excavation mode, rather than just the last ring excavated.

[0096] According to the tunnel construction management method and construction management system of the present invention, the construction manager can select one of three management modes to optimally control the cutter rotation speed to a rotation speed corresponding to each management process while the shield tunneling machine 10 is excavating. As a result, when the power saving mode is selected, the power supplied to the cutter drive electric motor 11 is reduced, making it possible to conserve energy.

[0097] When the bit life extension mode is selected, the sliding distance of the cutter bit 14 can be reduced, making it possible to extend the life of the cutter bit 14. This is expected to reduce the cost of replacing bits, shorten the construction period, and improve labor safety. When the stable excavation mode is selected, it is possible to stabilize the excavation speed without being affected by temporary changes in ground conditions. This can therefore contribute to shortening the construction period and improving productivity for the entire tunnel construction work.

[0098] The construction management system and construction management method of the present invention are not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit of the present invention.

[0099] For example, the three types of management processes may be selected each time one segment ring is excavated, or may be selected for each site or for each arbitrary construction section.

[0100] In this embodiment, the calculation processing unit 53 of the information processing device 50 is provided with a torque processing unit 531, a power management unit 532, a wear management unit 533, an excavation management unit 534, and an evaluation calculation unit 535. However, this is not limited to this, and these may be provided in the calculation unit 413 of the excavation management system 40. [Explanation of symbols]

[0101] 10 Shield tunneling machine (tunnel boring machine) 11 Cutter drive electric motor 111 Sensors 12 Cutter head 121 Cutter Spoke 13 Shield body 131 Food Section 132 Bulkhead 14 Cutter Bit 15 Chambers 16 Screw conveyor 17 Shield Jack 18 Rear equipment 20 Segment Ring 21 Segments 30 Cutter drive unit 31 Inverter board 32 Motor side control device 321 Input section 322 Output section 323 Arithmetic section 324 Storage section 40 Excavation Management System 41 Management control device 411 Input section 412 Output section 413 Arithmetic section 414 Storage section 42 Management Monitor 50 Information processing device 51 Input section 52 Output section 53 Processing unit 531 Torque processing section 532 Power Management Department 533 Wear Control Department 534 Excavation Management Department 535 Evaluation Calculation Department 54 Memory section A Face S Excavated soil

Claims

1. A method for managing tunnel construction using a tunnel boring machine that excavates natural ground by rotating a cutter head, comprising the steps of: A step of selecting one of a power management step of managing power consumption, a wear management step of managing the wear amount of a cutter bit, and an excavation management step of managing an excavation speed; a step of continuously measuring a cutter torque while excavating the natural ground with the tunnel boring machine and periodically calculating a representative torque value; A tunnel construction management method, characterized in that while the tunnel boring machine excavates the ground, the torque representative value is monitored, the cutter rotation speed at which the cutter head rotates is controlled, and a selected management process is carried out.

2. In the tunnel construction management method according to claim 1, A tunnel construction management method, characterized in that the management process is selected each time one segment ring is excavated.

3. In the tunnel construction management method according to claim 1, In the power management step, the cutter rotation speed is increased or decreased within a range in which the torque representative value does not exceed a torque threshold value set based on an equipment torque, A tunnel construction management method characterized by reducing power consumption.

4. In the tunnel construction management method according to claim 1, In the wear management step, the cutter rotation speed is reduced within a range in which the torque representative value does not exceed a torque threshold value set based on an installation torque, A tunnel construction management method, characterized by reducing the sliding distance of the cutter bit.

5. In the tunnel construction management method according to claim 1, In the excavation management step, when the torque representative value exceeds a torque threshold value set based on an equipment torque, the cutter rotation speed is increased to reduce the torque representative value to a range not exceeding the torque threshold value, and then A tunnel construction management method characterized by maintaining the cutter rotation speed and stabilizing the excavation speed.

6. A construction management system for tunnel construction using a tunnel boring machine that excavates natural ground by rotating a cutter head, a torque processing unit that continuously measures a cutter torque while the tunnel boring machine excavates the natural ground and periodically calculates a torque representative value; a power management unit that monitors the torque representative value while controlling the cutter rotation speed and manages power consumption; a wear management unit that monitors the torque representative value while controlling the cutter rotation speed and manages the wear amount of the cutter bit; an excavation management unit that monitors the torque representative value while controlling the cutter rotation speed and managing the excavation speed; A tunnel construction management system comprising:

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