Backfill injection system

Abstract

To provide a backfill injection system capable of executing backfill injection into tail voids with an appropriate amount of filling.SOLUTION: The backfill injection system includes: multiple tail intermediate pressure gauges 34 that are provided respectively between neighboring backfill injection holes 13 provided in the tail, and measure soil water pressures acting on the tail; and an injection control unit 413 that is configured so as to, when all of the soil water pressures measured by the neighboring tail intermediate pressure gauges 34 reach a filling pressure, stop injection of backfill material from the backfill injection holes 13 located therebetween. Completion of filling is determined at a position where the filled backing material injected into the tail voids reaches last on the basis of measurement of the soil water pressures with the tail intermediate pressure gauges 34 provided at respective mid-points of the neighboring backfill injection holes.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a backfill injection system for injecting and filling a backfill material into a tail void. [Background technology]

[0002] The shield machine is equipped with a cylindrical skin plate and a cutter head rotatably attached to the tip of the skin plate in the traveling direction, and moves forward by pressing a jack against the existing segment while rotating the cutter head. The outer diameter of the cutter head is set to be slightly larger than the outer diameter of the skin plate, and a predetermined overcut clearance is formed between the ground cut by the cutter head and the skin plate.

[0003] In addition, because the segments are assembled inside the skin plate, a space called a tail void, which is larger than the overexcavation clearance, is formed between the outer periphery of the segment and the ground. For this reason, backfill material is injected and filled into the tail void through a backfill injection pipe installed in the skin plate (inside or outer periphery) at the same time as the shield machine excavates (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-56286 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional technology, when injecting backfill material based on the injection volume, excessive injection pressure can result, and when injecting backfill material based on the injection pressure, the injection volume can be insufficient, making it difficult to determine the appropriate filling volume.

[0006] The present invention has been made in consideration of the above-mentioned situation, and aims to provide a backfill injection system that can solve the above-mentioned problems and perform backfill injection into the tail void with an appropriate filling amount without causing excess or deficiency. [Means for solving the problem]

[0007] The backfill injection system of the present invention is applied to the tail of the skin plate. Arranged in the circumferential direction around the direction of travel A backfill injection system that injects a backfill material into a tail void from a plurality of backfill injection holes provided therein, a tail pressure gauge provided adjacent to each of the backfill injection holes and corresponding to each of the plurality of backfill injection holes, for measuring soil and water pressure acting on the tail; Between adjacent backfill injection holes provided in the tail At the midpoint of A plurality of tail intermediate pressure gauges each provided to measure soil-water pressure acting on the tail; The filling pressure of the backfill injection device that injects the backfill material into the backfill injection hole is controlled so as to be equal to the soil-water pressure measured by the corresponding tail pressure gauge, and Any of the soil water pressures measured by adjacent tail intermediate pressure gauges The above and an injection control unit that stops the injection of the backfilling material from the backfilling injection hole located between the backfilling material and the injection pressure when the filling pressure is reached. 。 Furthermore, the backfill injection system of the present invention may be provided with an injection status notification unit that issues an abnormality notification when the measurement value of either or both of the tail intermediate pressure gauges located on both sides does not reach the filling pressure even if the injection amount of the backfill material injected from the backfill injection hole reaches the filling amount set for each backfill injection hole. Effect of the Invention

[0008] According to the present invention, it is possible to accurately determine the completion of filling of the tail void, and it is possible to perform backfill injection into the tail void with an appropriate filling amount without causing excess or deficiency. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic diagram of a shield tunneling machine. [Diagram 2] 1 is a block diagram showing a configuration of an embodiment of a backfill injection system according to the present invention. FIG. [Diagram 3] FIG. 3 is a cross-sectional view showing the arrangement of the side pressure gauges shown in FIG. 2. [Figure 4] FIG. 3 is a perspective view showing the arrangement of a side pressure gauge, a tail pressure gauge, and a tail intermediate pressure gauge shown in FIG. 2. [Diagram 5] 3 is a diagram showing an example of an injection status notification screen generated by an injection status notification unit shown in FIG. 2. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 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. In the following embodiment, components having similar functions are given the same reference numerals and the description thereof will be omitted as appropriate. The shield machine 1 shown in Figure 1 is an earth pressure shield machine, and includes a cylindrical skin plate 2 and a cutter head 3 rotatably attached to the tip of the skin plate 2 in the traveling direction. A rotating ring 4 is rotatably supported at the front of the skin plate 2 via a bearing or other bearing. The rotating ring 4 is connected to the cutter head 3 via a connecting beam 5. A plurality of cutter rotation motors 6 that rotate the rotating ring 4 are attached to the skin plate 2. As a result, when the cutter rotation motors 6 are rotationally driven, the cutter head 3 rotates via the connecting beam 5.

[0011] A partition wall 7 is provided on the skin plate 2, located behind the cutter head 3, and a chamber 8 is formed between the cutter head 3 and the partition wall 7 to be filled with excavated soil. The soil excavated by the cutter head 3 fills the chamber 8 as mud and is transported to the rear side by a screw conveyor 9.

[0012] The shield tunneling machine 1 advances by pressing a jack 10 against an existing segment 11 while rotating the cutter head 3. The outer diameter of the cutter head 3 is set to be slightly larger than the outer diameter of the skin plate 2, and a predetermined overcut clearance is formed between the ground cut by the cutter head 3 and the skin plate 2. The segments 11 are assembled by an erector 12 provided inside the skin plate 2, so that a space called a tail void larger than the overcut clearance is formed between the outer peripheral surface of the segment 11 and the ground.

[0013] The backfilling injection system 20 of this embodiment is a system that injects and fills a backfilling material into a tail void formed between the outer peripheral surface of the segment 11 and the ground.

[0014] Referring to FIG. 2, the tail of the skin plate 2 is provided with a plurality of backfill injection holes 13 for injecting backfill material into the tail void, and the backfill material is injected into the tail void from the plurality of backfill injection holes 13 provided in the tail of the skin plate 2 at the same time as the tail void is generated by the tunneling of the shield machine 1. In FIG. 2, six backfill injection holes 13 are formed at equal intervals of 45°, but there is no particular limit to the number of backfill injection holes 13 and their formation intervals. In FIG. 2, the backfill injection pipe is installed inside the skin plate 2, and the backfill injection holes 13 are formed on the mouth-side end face of the skin plate 2, but the backfill injection pipe may be installed on the inner or outer peripheral surface of the skin plate 2, and the backfill injection holes 13 may be formed to protrude from the mouth-side end face of the skin plate 2 to the inner or outer peripheral side.

[0015] 2, the backfill injection system 20 includes a plurality of backfill injection devices 30 provided corresponding to the plurality of backfill injection holes 13, a plurality of tail intermediate pressure gauges 34 provided between adjacent backfill injection holes 13, and an injection control device 40 that individually controls the plurality of backfill injection devices 30. Note that the backfill material may be made of various materials and have various properties, and may be, for example, a two-component backfill material in which material A (main material) and material B (hardening material) are mixed immediately before injection to form a plastic state or harden, or a one-component backfill material such as slag-lime mortar or concrete.

[0016] The backfill injection device 30 is equipped with a side pressure gauge 31, a tail pressure gauge 32, and a backfill injection pump 33, and the backfill injection pump 33 is driven and controlled by the injection control device 40 so that the filling pressure set based on the soil / water pressure measured by the side pressure gauge 31 is equal to the soil / water pressure measured by the tail pressure gauge 32.

[0017] 3 and 4, the side pressure gauge 31 is attached to the outer peripheral surface of the skin plate 2 and measures the soil / water pressure acting on the outer peripheral surface of the skin plate 2 at the depth where the backfilling injection holes 13 are provided. In other words, the side pressure gauge 31 is attached at the same depth as the backfilling injection holes 13. Therefore, when multiple backfilling injection holes 13 are formed at different depths as shown in FIG. 2, the side pressure gauges 31 in the multiple backfilling injection devices 30 measure the soil / water pressure acting on the outer peripheral surface of the skin plate 2 at different depths.

[0018] As shown in FIG. 4, the tail pressure gauge 32 is attached near the backfill injection hole 13 provided in the tail of the skin plate 2, and measures the soil-water pressure acting on the tail of the skin plate 2 at the depth where the backfill injection hole 13 is provided. Since the tail pressure gauge 32 is attached near the backfill injection hole 13, it is possible to directly measure the injection pressure of the backfill material injected from the backfill injection hole 13 into the tail void by measuring the soil-water pressure acting on the tail of the skin plate 2. In other words, the tail pressure gauge 32 is attached at a position where it can directly measure the injection pressure of the backfill material injected from the backfill injection hole 13 into the tail void. This makes it possible to accurately measure the injection pressure to which no piping resistance pressure is added.

[0019] The backfilling injection pump 33 has a function of receiving control of the rotation speed of the motor and adjusting the injection amount of the backfilling material.

[0020] As shown in FIG. 4, the tail intermediate pressure gauge 34 is provided between adjacent backfill injection holes 13 provided in the tail of the skin plate 2, and measures the soil / water pressure acting on the tail of the skin plate 2. In the tail of the skin plate 2, the midpoint between adjacent backfill injection holes 13 is the position where the backfill material injected into the tail void and filled finally reaches. Therefore, when the soil / water pressure measured by the tail intermediate pressure gauge 34 rises to the filling pressure, the completion of filling the tail void with the backfill material can be detected. Note that it is preferable to position the tail intermediate pressure gauge 34 at the midpoint between adjacent backfill injection holes 13, but it may be slightly shifted.

[0021] The injection control device 40 is realized by a so-called computer, and includes an arithmetic unit 41 such as a CPU that operates under program control, an operation unit 42 such as a keyboard, a display unit 43 such as a liquid crystal display, and a transmission / reception unit 44, which are connected by a bus 45. It has the function of transmitting and receiving various information between multiple backfill injection devices 30, the function of receiving measurement results from multiple tail intermediate pressure gauges 34, and the function of receiving position information of the shield tunneling machine 1 from a position measuring device (not shown) that uses surveying equipment such as an optical range finder (total station), laser, and gyro.

[0022] The calculation unit 41 also functions as a filling pressure setting unit 411, an injection amount calculation unit 412, an injection control unit 413, and an injection status notification unit 414.

[0023] The filling pressure setting unit 411 sets the filling pressure for each of the multiple backfilling injection devices 30 based on the soil / water pressure measured by the side pressure gauge 31 of each of the multiple backfilling injection devices 30. The filling pressure is set to a value greater than the measured soil / water pressure. For example, a value obtained by adding a preset pressure to the measured soil / water pressure is set as the filling pressure. Alternatively, a value obtained by multiplying the measured soil / water pressure by a preset coefficient of 1 or more may be set as the filling pressure.

[0024] The filling pressure may be a fixed value using the soil-water pressure measured before the start of injection of the backfill material, or may be a variable value using the soil-water pressure measured during the injection of the backfill material. When the filling pressure is a fixed value, the filling pressure setting unit 411 can set the filling pressure using the soil-water pressure measured immediately before the start of injection of the backfill material. In addition, the filling pressure setting unit 411 stores the measured soil-water pressure in association with position information from a position measuring device (not shown), and sets the filling pressure using the soil-water pressure measured when the side pressure gauge 31 was at the position of the backfill injection hole 13 before the start of injection of the backfill material, which is more preferable because it allows the appropriate filling pressure to be set according to the current situation.

[0025] The injection amount calculation unit 412 calculates the volume of the tail void into which the backfilling material is injected and filled as the total filling amount based on position information from a position measurement device (not shown). The injection amount calculation unit 412 also calculates a value obtained by dividing the total injection amount by the number of backfilling injection devices 30 as the individual filling amount. The total filling amount and the individual filling amount may be received from the operation unit 42.

[0026] The injection control unit 413 drives and controls the backfill injection pumps 33 of the multiple backfill injection devices 30 so that the filling pressures of the multiple backfill injection devices 30 set by the filling pressure setting unit 411 are equal to the soil / water pressures measured by the tail pressure gauges 32 of the multiple backfill injection devices 30. When the soil / water pressure measured by the tail pressure gauge 32 is lower than the filling pressure, the injection control unit 413 increases the discharge amount of the backfill material by the backfill injection pump 33, and when the soil / water pressure measured by the tail pressure gauge 32 is higher than the filling pressure, the injection control unit 413 decreases the discharge amount of the backfill material by the backfill injection pump 33. The injection control unit 413 also measures the individual injection amounts by integrating the discharge amounts of the backfill material by the backfill injection pump 33, and outputs the results to the injection status notification unit 414.

[0027] In addition, the injection control unit 413 monitors the soil / water pressure measurement values ​​measured by each of the multiple tail intermediate pressure gauges 34, and when all of the soil / water pressures measured by adjacent tail intermediate pressure gauges 34 on either side of the backfill injection hole 13 (backfill injection device 30) reach the filling pressure, it stops the backfill injection pump 33 of the backfill injection device 30 located between the tail intermediate pressure gauges 34 that have reached the filling pressure, and terminates the injection of the backfill material.

[0028] The injection status notification unit 414 generates an injection status notification screen 50 as shown in Fig. 5 and displays it on the display unit 43. The injection status notification screen 50 includes an operation display field 51, an individual display field 52, an overall display field 53, and a contour display field 54 that shows the injection status of the backfill material.

[0029] The operation display field 51 indicates whether the multiple backfill injection devices 30 are operating or stopped by distinguishing them using characters, colors, marks, etc.

[0030] The individual display field 52 displays the respective filling pressures of the multiple backfill injection devices 30 set by the filling pressure setting unit 411, the respective injection pressures (soil-water pressures) measured by the tail pressure gauges 32 of the multiple backfill injection devices 30, the respective individual filling amounts by the backfill injection devices 30 calculated by the injection amount calculation unit 412, and the respective individual injection amounts by the multiple backfill injection devices 30.

[0031] The total display field 53 displays the total filling amount calculated by the injection amount calculation unit 412 and the total injection amount by the multiple backfill injection devices 30.

[0032] The contour display field 54 displays the injection status of the backfill material in a contour. In the contour display field 54, the doughnut-shaped area is the total filling amount area showing the total filling amount, and the area expanding from the inner circumference to the outer circumference within the total filling amount area is the individual injection amount area showing the total injection amount. The individual injection amount area has a shape according to the individual injection amount for each injection control device 40, and indicates the injection pressure for each injection control device 40 in terms of concentration. In addition, the injection status notification screen 50 may display each soil water pressure measured by the multiple tail intermediate pressure gauges 34. By visualizing the injection status (injection pressure and injection amount) for each backfill injection hole 13 using the contour display field 54, it is possible to see at a glance whether the injection pressure and injection amount are excessive or insufficient.

[0033] In addition, the injection status notification unit 414 notifies the administrator of an abnormality regarding the injection control device 40 in which the injection of the backfilling material is not stopped because the measurement values ​​of the tail intermediate pressure gauges 34 on both sides do not reach the filling pressure even when the individual injection amount reaches the individual filling amount. The abnormality notification is, for example, by changing the color or blinking the operation display field 51 or the individual display field 52 of the target injection control device 40 on the injection status notification screen 50. The notification may also be sent to the administrator's terminal. The abnormality notification allows the administrator to recognize that the backfilling material is flowing into other areas. At this time, if the injection of the backfilling material is stopped in a deeper area before the individual injection amount reaches the individual filling amount, it is understood that the difference between the individual injection amount and the individual filling amount in that area may be continuously injected.

[0034] In this embodiment, one backfill injection device 30 is provided for one backfill injection hole 13, but a certain degree of effect can also be obtained by grouping multiple backfill injection holes 13 by depth and providing one backfill injection device 30 for each group.

[0035] In addition, in this embodiment, the injection control unit 413 is configured to drive and control the backfilling injection pump 33 to automatically control the filling pressure by the backfilling injection device 30, but the administrator can also manually control the drive of the backfilling injection pump 33. In this case, the injection control unit 413 displays on the display unit 43 motor control information such as the setting value (motor rotation speed, etc.) for the backfilling injection pump 33 and the amount and direction of increase / decrease in the rotation speed so that the soil / water pressure measured by the tail pressure gauge 32 becomes the filling pressure set by the filling pressure setting unit 411, and the administrator can manually control the drive of the backfilling injection pump 33 based on the motor control information.

[0036] Furthermore, in this embodiment, the shield machine 1 has been described as a mud pressure shield machine, but the present invention can also be applied to a mud water type shield machine that stabilizes the face by applying a predetermined pressure to the mud water in a chamber and transports the excavated soil by circulating the mud water.

[0037] As described above, this embodiment includes a plurality of tail intermediate pressure gauges 34 that are provided between adjacent backfilling injection holes 13 provided in the tail and measure the soil-water pressure acting on the tail, and an injection control unit 413 that stops the injection of backfilling material from the backfilling injection holes 13 located between them when the soil-water pressures measured by the adjacent tail intermediate pressure gauges 34 reach the filling pressure. The filling pressure may be preset by input from the operation unit 42, etc. With this configuration, it is possible to accurately determine when the tail void has been filled, and backfill injection into the tail void can be performed with an appropriate amount of filling without causing any overfill or deficiency.

[0038] Furthermore, in this embodiment, the tail intermediate pressure gauge 34 is provided at the midpoint between the adjacent backfill injection holes. With this configuration, completion of filling can be determined based on the position where the backfill material injected into the tail void finally reaches, so that backfill injection into the tail void can be performed with an appropriate filling amount without causing overfill or deficiency.

[0039] Furthermore, in this embodiment, an injection status notification unit 414 is provided that notifies an abnormality when the measurement value of either or both of the tail intermediate pressure gauges 34 located on both sides does not reach the filling pressure even if the injection amount of the backfill material injected from the backfill injection hole 13 reaches the filling amount set for each backfill injection hole 13. This configuration makes it possible to notify abnormalities in filling the tail void at an appropriate time.

[0040] The present invention has been described above based on the embodiment. This embodiment is merely an example, 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]

[0041] 1. Shield tunneling machine 2. Skin Plate 3 Cutter Head 4 Rotating Ring 5 Connecting beam 6 Cutter rotation motor 7 Bulkhead 8. Chambers 9. Screw Conveyor 10 Jack 11 Segments 12 Erector 13 Backfill injection hole 20 Backfill Injection System 30 Backfill injection device 31 Side pressure gauge 32 Tail pressure gauge 33 Backfill injection pump 34 Tail intermediate pressure gauge 40 Injection control device 41 Arithmetic section 42 Operation section 43 Display section 44 Transmitter / receiver 45 Bus 50 Injection status notification screen 51 Operation display field 52 Individual display field 53 Overall display field 54 Contour display field 411 Filling pressure setting unit 412 Injection amount calculation section 413 Injection control unit 414 Injection Status Notification Unit

Claims

1. A backfill injection system that injects backfill material into a tail void from a plurality of backfill injection holes arranged in a circumferential direction around the traveling direction of the tail of a skin plate, a tail pressure gauge provided adjacent to each of the backfill injection holes and corresponding to each of the plurality of backfill injection holes, for measuring soil and water pressure acting on the tail; A plurality of tail intermediate pressure gauges each provided at an intermediate point between adjacent backfill injection holes provided in the tail, for measuring soil and water pressure acting on the tail; A backfill injection system characterized by comprising: an injection control unit that controls the filling pressure of a backfill injection device that injects the backfill material into the backfill injection hole so that the filling pressure is equal to the soil / water pressure measured by the corresponding tail pressure gauge, and when both of the soil / water pressures measured by adjacent tail intermediate pressure gauges reach the filling pressure, stops the injection of the backfill material from the backfill injection hole located between them.

2. The backfill injection system described in claim 1, characterized in that it is equipped with an injection status notification unit that notifies an abnormality when the measurement value of either or both of the tail intermediate pressure gauges located on both sides does not reach the filling pressure even when the injection amount of the backfill material injected from the backfill injection hole reaches the filling amount set for each backfill injection hole.

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