Lubricant injection system

Abstract

To provide a skid injection system that can grasp a skid injecting state.SOLUTION: A skid injection system 20 injects skids between a shield excavator and the natural ground from a skid injecting nozzle 21 that functions as a skid injecting hole penetrating a skin plate 3 of a shield excavator. The skid injection system comprises: a front side pressure gauge 22 mounted to an outer peripheral surface of the skin plate 3 at a front side in the excavation direction rather than the skid injection nozzle 21, for measuring an earth and water pressure acting on an outer peripheral surface of the skin plate 3 before injecting the skids; a rear side pressure gauge 23 mounted to an outer peripheral surface of the skin plate 3 at a rear side of the excavation direction rather than the skid injection nozzle 21, for measuring an earth and water pressure acting on an outer peripheral surface of the skin plate 3 after injecting the skids; and an injection control device 40 (a display part 42, an injection state notification part 54) for displaying measured values of the front side pressure gauge 22 and the rear side pressure gauge 23.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a lubricant injection system that injects lubricant between a shield machine and the natural ground. [Background technology]

[0002] To suppress vibrations caused by friction between the shield machine and the ground, a friction-reducing lubricant is injected around the shield machine (see, for example, Patent Document 1). In Patent Document 1, a pressure gauge is installed in front of the injection hole through which the lubricant is injected, and the lubricant is injected at a pressure equal to or greater than the measured overburden pressure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-9566 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional technology has a problem in that it is not possible to grasp the injection status of the lubricant. That is, in Patent Document 1, the lubricant is injected at a pressure equal to or greater than the overburden pressure, and the injection pressure is managed, but it is not possible to confirm whether the injected lubricant has been reliably injected between the shield machine and the natural ground.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a lubricant injection system that can solve the above problems and grasp the lubricant injection status. [Means for solving the problem]

[0006] The slip injection system of the present invention is a slip injection system that injects slip between a shield machine and the natural ground from a slip injection hole that penetrates the skin plate of the shield machine, and includes: a front pressure gauge attached to the outer peripheral surface of the skin plate forward of the slip injection hole in the excavation direction; a rear pressure gauge attached to the outer peripheral surface of the skin plate rearward of the slip injection hole in the excavation direction; and an injection control device that displays the measured values ​​of the front pressure gauge and the rear pressure gauge. The injection of the lubricant is controlled based on the measured values ​​of the front pressure gauge and the rear pressure gauge. It is characterized by: Furthermore, in the lubricant injection system of the present invention, the lubricant injection hole is inclined rearward so that the lubricant is injected rearward in the excavation direction. The pressure gauge is arranged so that the soil-water pressure measured by the front pressure gauge is not affected by the lubricant injected from the lubricant injection hole. It's okay to have it. Furthermore, in the lubricant injection system of the present invention, the injection control device may control the injection pressure and injection flow rate of the lubricant so that the measurement value of the rear pressure gauge is greater than the measurement value of the front pressure gauge and is less than the target soil / water pressure obtained by adding a set margin pressure to the measurement value of the front pressure gauge. Furthermore, in the lubricant injection system of the present invention, multiple sets of lubricant injection holes, front pressure gauges, and rear pressure gauges are provided in the circumferential direction of the skin plate, and the injection control device may display the measurement values ​​of each set of the front pressure gauges and rear pressure gauges on a single screen. [Effects of the Invention]

[0007] According to the present invention, it is possible to grasp the injection status of the lubricant and to confirm whether the injected lubricant has been reliably injected between the shield machine and the natural ground. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing the configuration of a shield tunneling machine equipped with an embodiment of a lubricant injection system according to the present invention. [Figure 2] 1 is a block diagram showing the configuration of a lubricant injection system according to the present invention. [Figure 3] 3 is a diagram showing an example of a display screen displayed on the display unit shown in FIG. 2. FIG. [Figure 4] 1 is a diagram showing an example of the circumferential arrangement of a lubricant injection system according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Next, a mode for carrying out the present invention (hereinafter simply referred to as an "embodiment") will be specifically described with reference to the drawings.

[0010] The lubricant injection system 20 of this embodiment is a system that injects lubricant between the shield machine 1 shown in Figure 1 and the natural ground. The shield machine 1 is equipped with a cylindrical skin plate 3 and a cutter head 4 that is rotatably attached to the tip of the skin plate 3 in the direction of travel. Note that although the shield machine 1 will be described as an earth pressure type shield machine, it may also be a slurry type shield machine.

[0011] A rotating ring 5 is rotatably supported at the front of the skin plate 3 via bearings or other bearings. The rotating ring 5 is connected to the cutter heads 4 via connecting beams 6. A plurality of cutter rotation motors 7 that rotate the rotating ring 5 are attached to the skin plate 3. As a result, when the cutter rotation motors 7 are rotated, the cutter heads 4 rotate via the connecting beams 6.

[0012] A steel partition wall 8 is provided on the skin plate 3 and is located behind the cutter head 4, and a chamber 2 is formed between the cutter head 4 and the partition wall 8. The chamber 2 is a space that is filled with the soil excavated by the cutter head 4, and the partition wall 8 separates the chamber 2 filled with the excavated soil from the interior 9 of the machine where workers enter.

[0013] The shield machine 1 also has an excavation additive injection pipe 10 that penetrates the partition wall 8 and supplies additives (clay, bentonite, air bubbles, water-soluble polymers, etc.) to the front of the cutter head 4 and to the chamber 2. The additives used are suited to the ground conditions, with the aim of imparting fluidity and water-stopping properties to the soil and sand filled in the chamber 2.

[0014] The earth and sand excavated by the cutter head 4 fills the chamber 2 as mud, is stirred by a mixing rod 11 attached to the cutter head 4, and then is transported to the rear side by a screw conveyor 12.

[0015] Referring to Figures 1 and 2, the lubricant injection system 20 includes a lubricant injection nozzle 21, a front pressure gauge 22, a rear pressure gauge 23, a flow meter 24, an injection pump 25, and an injection control device 40.

[0016] The lubricant injection nozzle 21 is an injection device that injects lubricant between the shield machine 1 and the natural ground. The lubricant injection nozzle 21 penetrates the skin plate 3 and is attached so that its tip opens into the outer peripheral surface of the skin plate 3, and functions as a lubricant injection hole that penetrates the skin plate 3. The lubricant injection nozzle 21 is also attached at an angle rearward so that the lubricant is injected rearward in the excavation direction of the shield machine 1.

[0017] The front pressure gauge 22 is a pressure gauge that measures the soil and water pressure acting on the outer peripheral surface of the skin plate 3, and is attached to the outer peripheral surface of the skin plate 3 forward of the opening of the lubricant injection nozzle 21 in the excavation direction. Therefore, the soil and water pressure measured by the front pressure gauge 22 is the soil and water pressure before the lubricant is injected, which is not affected by the lubricant injected from the lubricant injection nozzle 21. In other words, the front pressure gauge 22 is located near the opening of the lubricant injection nozzle 21 and at a position where it can measure the soil and water pressure before the lubricant is injected, without being affected by the lubricant injected from the lubricant injection nozzle 21. Note that the lubricant injection nozzle 21 does not necessarily have to be tilted rearward as long as the distance between the front pressure gauge 22 and the opening of the lubricant injection nozzle 21 is sufficient so that the lubricant injected from the lubricant injection nozzle 21 does not affect the measurement by the front pressure gauge 22.

[0018] The rear pressure gauge 23 is a pressure gauge that measures the soil and water pressure acting on the outer peripheral surface of the skin plate 3, and is attached to the outer peripheral surface of the skin plate 3 rearward in the excavation direction from the opening of the lubricant injection nozzle 21. Therefore, the soil and water pressure measured by the rear pressure gauge 23 is affected by the lubricant injected from the lubricant injection nozzle 21, and becomes the soil and water pressure after the lubricant is injected. In other words, the rear pressure gauge 23 is located near the opening of the lubricant injection nozzle 21, and is positioned so that it can be affected by the lubricant injected from the lubricant injection nozzle 21 and measure the soil and water pressure after the lubricant is injected.

[0019] The flow meter 24 measures the flow rate of the lubricant supplied from the injection pump 25 to the lubricant injection nozzle 21 as the injection amount of the lubricant injected by the injection pump 25 between the shield machine 1 and the natural ground.

[0020] The injection pump 25 receives motor rotation control from the injection control device 40 and has the function of adjusting the injection pressure and injection amount per unit time (hereinafter referred to as injection flow rate) of the lubricant injected between the shield tunneling machine 1 and the ground via the lubricant injection nozzle 21.

[0021] Injection control device 40 is realized by a so-called computer, and comprises an arithmetic unit 50 such as a CPU that operates under program control, an operation unit 41 such as a keyboard, a display unit 42 such as an LCD display, and a transceiver unit 43, all of which are connected by a bus 44. Transceiver unit 43 has the functions of receiving the measurement results of front pressure gauge 22, rear pressure gauge 23, and flow meter 24, transmitting and receiving various control signals that control the rotation of injection pump 25, and receiving the excavation distance of shield machine 1 from an excavation control device (not shown) that controls the excavation of shield machine 1.

[0022] The calculation unit 50 also functions as an injection amount setting unit 51, an injection pressure setting unit 52, an injection control unit 53, and an injection status notification unit .

[0023] The injection amount setting unit 51 receives and sets the amount of lubricant to be injected per excavation distance of the shield machine 1 as a unit injection amount from the operation unit 41.

[0024] The injection pressure setting unit 52 receives from the operation unit 41 and sets the increase in soil-water pressure expected due to the injection of the lubricant as a margin pressure.

[0025] The injection control unit 53 calculates and sets the injection amount of lubricant by multiplying the excavation distance of the shield machine 1, received via the transceiver unit 43, by the unit injection amount set in the injection amount setting unit 51. Therefore, the calculated injection amount of lubricant increases as the shield machine 1 excavates. The shield machine 1 advances by pressing the jack 13 against the existing segments 14 while rotating the cutter head 4. Therefore, the stroke of the jack 13 is the excavation distance of the shield machine 1, and the injection control unit 53 calculates and sets the injection amount of lubricant for each stroke of the jack 13.

[0026] The injection control unit 53 controls the rotation of the injection pump 25 to inject the lubricant from the lubricant injection nozzle 21 until the measurement value of the flow meter 24 reaches the set injection amount of lubricant, thereby injecting the lubricant between the shield machine 1 and the natural ground. The injection control unit 53 also adds the margin pressure set in the injection pressure setting unit 52 to the measurement value of the front pressure gauge 22 to determine the target soil-water pressure, and controls the injection pressure and injection flow rate of the lubricant by the injection pump 25 so that the measurement value of the rear pressure gauge 23 is greater than the measurement value of the front pressure gauge 22 but equal to or less than the target soil-water pressure. For example, when the measurement value of the rear pressure gauge 23 is equal to or less than the measurement value of the front pressure gauge 22, the injection control unit 53 responds by increasing the injection pressure of the lubricant by the injection pump 25 and increasing the injection flow rate. When the measurement value of the rear pressure gauge 23 exceeds the target soil-water pressure, the injection control unit 53 responds by decreasing the injection pressure of the lubricant by the injection pump 25 and decreasing the injection flow rate.

[0027] In this way, in the lubricant injection system 20 of this embodiment, by setting a set injection amount in the injection amount setting unit 51 and a surplus pressure in the injection pressure setting unit 52, the injection of the lubricant is automatically controlled based on the measured values ​​of the front pressure gauge 22 and the rear pressure gauge 23. The unit injection amount (L / mm) is calculated from the set injection amount (L) and the jack stroke (mm). The lubricant injection system 20 can reliably inject the injected lubricant between the shield tunneling machine 1 and the natural ground.

[0028] The injection status notification unit 54 displays an injection status notification screen 60 shown in Figure 3(a) on the display unit 42 and notifies the administrator (the operator of the shield tunneling machine 1) of the status of the injection of the lubricant. The injection status notification screen 60 includes a set injection amount display field 61 where the injection amount set by the injection control unit 53 is displayed as the set injection amount, a measured injection amount display field 62 where the measurement value of the flow meter 24 is displayed as the measured injection amount, a pre-injection soil-water pressure display field 63 where the measurement value of the front pressure gauge 22 is displayed as the pre-injection soil-water pressure, a target soil-water pressure display field 64 where the target soil-water pressure obtained by adding the margin pressure set in the injection pressure setting unit 52 to the measurement value of the front pressure gauge 22 is displayed, a post-injection soil-water pressure display field 65 where the measurement value of the rear pressure gauge 23 is displayed as the post-injection soil-water pressure, and a manual button 66.

[0029] The manual button 66 is a button for switching the lubricant injection control to manual mode. When the manual button 66 is operated, the injection status notification unit 54 displays the manual operation screen 70 shown in Figure 3(b) on the display unit 42, and the injection control unit 53 switches to manual control. For example, if the measured injection amount reaches the set injection amount but the post-injection soil-water pressure is significantly lower than the target soil-water pressure, or if the post-injection soil-water pressure exceeds the target soil-water pressure, the manager can switch to manual control and directly control the injection of the lubricant.

[0030] The manual operation screen 70 has a measured injection amount display field 62, a pre-injection soil water pressure display field 63, a target soil water pressure display field 64, and a post-injection soil water pressure display field 65 laid out in the same manner as the injection status notification screen 60, as well as an injection operation field 71 for operating the injection of lubricant, a manual surplus pressure setting field 72 for setting the injection pressure of the lubricant, a manual injection flow rate setting field 73 for setting the injection flow rate of the lubricant, and an automatic control button 74.

[0031] The injection operation field 71 has buttons for starting and stopping the injection of lubricant. The manual margin pressure setting field 72 has buttons for increasing and decreasing the injection pressure of the lubricant, and the manual injection flow rate setting field 73 has buttons for increasing and decreasing the injection flow rate of the lubricant.

[0032] When the injection control unit 53 is instructed to perform injection in the injection operation field 71, it controls the rotation of the injection pump 25 to spray lubricant from the lubricant injection nozzle 21 at the injection pressure set in the manual surplus pressure setting field 72 and the injection flow rate set in the manual injection flow rate setting field 73, thereby injecting the lubricant between the shield tunneling machine 1 and the ground.

[0033] Even with manual operation, the injection of the lubricant can be controlled while checking the injection status using the measured injection amount, pre-injection soil water pressure, target soil water pressure, and post-injection soil water pressure. Therefore, the manager can manually inject the injected lubricant reliably between the shield machine 1 and the natural ground.

[0034] The automatic control button 74 is a button for switching the lubricant injection control to automatic control by the injection control unit 53. When the automatic control button 74 is operated, the injection status notification unit 54 displays the injection status notification screen 60 on the display unit 42, and the injection control unit 53 switches to automatic control.

[0035] Furthermore, as in the lubricant injection system 20A shown in Figure 4, multiple sets of lubricant injection nozzles 21, front pressure gauges 22, and rear pressure gauges 23 can be provided in the circumferential direction of the skin plate 3. In the example shown in Figure 4, three sets of lubricant injection nozzles 21, front pressure gauges 22, and rear pressure gauges 23 are arranged at the top end and on the left and right sides, but the number of sets and their arrangement can be set as appropriate.

[0036] A flow meter 24 and injection pump 25 are provided for each set of lubricant injection nozzle 21, front pressure gauge 22, and rear pressure gauge 23, and the injection status notification unit 54 of the injection control device 40A can be centrally managed by displaying the injection status notification screen 60 and manual operation screen 70 for each set on a single screen on the display unit 42. This makes it possible to centrally manage and adjust the injection position, injection amount, and injection flow rate of the lubricant, allowing it to be injected evenly around the shield machine 1.

[0037] As described above, this embodiment is a lubricant injection system 20 that injects lubricant between the shield tunneling machine 1 and the ground from a lubricant injection nozzle 21 that functions as a lubricant injection hole that penetrates the skin plate 3 of the shield tunneling machine 1, and is equipped with a front pressure gauge 22 attached to the outer surface of the skin plate 3 forward of the lubricant injection nozzle 21 in the excavation direction to measure the soil and water pressure acting on the outer surface of the skin plate 3 before the lubricant is injected, a rear pressure gauge 23 attached to the outer surface of the skin plate 3 rearward of the lubricant injection nozzle 21 in the excavation direction to measure the soil and water pressure acting on the outer surface of the skin plate 3 after the lubricant is injected, and an injection control device 40 (display unit 42, injection status notification unit 54) that displays the measurement values ​​of the front pressure gauge 22 and the rear pressure gauge 23. With this configuration, the lubricant can be injected between the shield tunneling machine 1 and the ground while checking the soil water pressure before and after injection, so that the injection status of the lubricant can be grasped and it can be confirmed whether the injected lubricant has been reliably injected between the shield tunneling machine 1 and the ground.

[0038] Furthermore, in this embodiment, the lubricant injection nozzle 21 is inclined rearward so that the lubricant is injected rearward in the excavation direction. With this configuration, the lubricant is not injected on the front side where the front pressure gauge 22 is located, but is injected on the rear side where the rear pressure gauge 23 is located, so that the soil water pressure before and after the injection of the lubricant can be confirmed.

[0039] Furthermore, in this embodiment, the injection control device 40 (injection control unit 53) controls the injection pressure and injection flow rate of the lubricant so that the measurement value of the rear pressure gauge 23 is greater than the measurement value of the front pressure gauge 22 and is less than the target soil-water pressure obtained by adding a set margin pressure to the measurement value of the front pressure gauge 22. This configuration allows automatic control of lubricant injection.

[0040] Furthermore, in this embodiment, multiple sets of lubricant injection nozzles 21, front pressure gauges 22 and lubricant injection nozzles 21 are provided in the circumferential direction of the skin plate 3, and the injection control device 40 (injection status notification unit 54) displays the measurement values ​​of each set of front pressure gauges 22 and rear pressure gauges 23 on a single screen on the display unit 42. This configuration allows the injection position, injection amount, and injection flow rate of the lubricant to be centrally managed and adjusted, allowing it to be injected evenly around the shield tunneling machine 1.

[0041] The present invention has been described above based on the embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in terms of the combination of the respective components, and that such modifications are also within the scope of the present invention. [Explanation of symbols]

[0042] 1. Shield tunneling machine 2 chambers 3 Skin Plate 4 cutter head 5 Rotating Rings 6 Connecting beams 7 Cutter turning motor 8 Bulkhead 9. Inside the aircraft 10 Excavation additive injection pipe 11 Mixing stick 12 Screw conveyor 13 Jack 14 segments 20, 20A lubricant injection system 21 Lubricant injection nozzle 22 Front pressure gauge 23 Rear pressure gauge 24 Flow meter 25 Infusion Pump 40, 40A injection control device 41 Operation section 42 Display section 43 Transmitter / Receiver 44 Bus 50 Arithmetic section 51 Injection amount setting section 52 Injection pressure setting unit 53 Injection control unit 54 Injection status notification unit 60 Injection status notification screen 61 Set injection amount display field 62 Measured injection amount display field 63 Pre-injection soil water pressure display field 64 Target soil water pressure display field 65 Soil water pressure display field after injection 66 Manual Button 70 Manual operation screen 71 Injection operation field 72 Manual margin pressure setting field 73 Manual injection flow rate setting field 74 Automatic Control Button

Claims

1. A lubricant injection system that injects lubricant between a shield machine and natural ground from a lubricant injection hole that penetrates a skin plate of the shield machine, a front pressure gauge attached to the outer peripheral surface of the skin plate on the front side of the lubricant injection hole in the excavation direction; a rear pressure gauge attached to the outer peripheral surface of the skin plate rearward of the lubricant injection hole in the excavation direction; an injection control device that displays the measurement values ​​of the front pressure gauge and the rear pressure gauge, and the injection of the lubricant is controlled based on the measurement values ​​of the front pressure gauge and the rear pressure gauge. A lubricant injection system characterized by:

2. The lubricant injection hole is inclined rearward so that the lubricant is injected rearward in the excavation direction, and is disposed so that the soil-water pressure measured by the front pressure gauge is not affected by the lubricant injected from the lubricant injection hole.

2. The lubricant injection system of claim 1.

3. The injection control device is characterized in that it controls the injection pressure and injection flow rate of the lubricant so that the measurement value of the rear pressure gauge is greater than the measurement value of the front pressure gauge and is less than the target soil-water pressure obtained by adding a set margin pressure to the measurement value of the front pressure gauge.

4. a plurality of sets of the lubricant injection holes, the front pressure gauges, and the rear pressure gauges are provided in the circumferential direction of the skin plate; 4. A lubricant injection system according to claim 1, wherein the injection control device displays the measured values ​​of each set of the front pressure gauge and the rear pressure gauge on one screen.

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