Backing injection system

Abstract

To provide a backfill injection system capable of executing backfilling into the tail voids without excess or deficiency.SOLUTION: The backfill injection system injects backing material into tail voids from multiple backfill injection holes 13 formed in a tail of a skin plate 2. The backfill injection system include: side pressure gauges 31 that are attached to an outer peripheral surface of the skin plate 2 and measure soil water pressure that acts on the outer peripheral surface of the skin plate 2; a filling pressure setting unit 411 that sets filling pressure based on the soil water pressures measured by the side pressure gauges 31; tail pressure gauges 32 that are attached to the tail to measure the soil water pressures acting on the tail; and an injection control unit 413 that controls the injection pressures of the backfill material injected into the tail voids so that the soil water pressures measured by the tail pressure gauges 32 become the filling pressure set by the filling pressure setting unit 411.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 Art

[0002] A shield tunneling machine includes a cylindrical skin plate and a cutter head rotatably attached to the tip of the skin plate in the advancing direction. While rotating the cutter head, the jack is pressed against the existing segment to move forward. The outer diameter of the cutter head is set slightly larger than the outer diameter of the skin plate, and a predetermined overexcavation clearance is formed between the ground cut by the cutter head and the skin plate.

[0003] In addition, since 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 peripheral surface of the segment and the ground. For this reason, simultaneously with the tunneling of the shield tunneling machine, a backfill material is injected and filled into the tail void by a backfill injection pipe provided on the skin plate (inside or outer periphery) (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the prior art, the injection pressure for backfilling is set to the face pressure + α (100 - 200 kPa), and injection is performed at the same injection pressure from a plurality of backfilling injection holes. Therefore, in a large cross-section shield, there is a problem that the height difference between the top and the bottom is large, and over-injection or under-injection of backfilling occurs due to the height difference. Also, in the case of low soil cover, at the face pressure + (100 - 200 kPa), it becomes larger than the resistance of the soil, and there is a risk of ground heaving due to the backfilling material and ejection onto the ground due to escape.

[0006] The present invention has been made in view of such a situation, and an object thereof is to provide a backfilling injection system that solves the above-described problems and can perform backfilling injection into the tail void without causing over-injection or under-injection.

Means for Solving the Problems

[0007] This The backfilling injection system of the invention is a backfilling injection system for injecting a backfilling material into a tail void from a plurality of backfilling injection holes provided at the tail of a skin plate, and includes a side pressure gauge attached to the outer peripheral surface of the skin plate for measuring the soil water pressure acting on the outer peripheral surface of the skin plate, a filling pressure setting unit for setting the filling pressure in a backfilling injection device for supplying the backfilling material to the backfilling injection holes based on the soil water pressure measured by the side pressure gauge, a tail pressure gauge attached to the tail for measuring the soil water pressure acting on the tail, and an injection control unit for controlling the injection pressure of the backfilling material into the tail void so that the soil water pressure measured by the tail pressure gauge becomes the filling pressure set by the filling pressure setting unit. A plurality of the side pressure gauges and the tail pressure gauges are attached, and the injection control unit is characterized in that it controls the injection pressure of each of the backfilling materials injected from the plurality of backfilling injection holes based on the measured values of the corresponding side pressure gauges and tail pressure gauges. Furthermore, in the backfilling injection system of the present invention, the side pressure gauge and the tail pressure gauge may be respectively attached corresponding to the depths of the plurality of backfilling injection holes. Furthermore, in the backfill injection system of the present invention, a plurality of intermediate tail pressure gauges are provided between the adjacent backfill injection holes provided in the tail, for measuring the earth pressure acting on the tail, and when the injection control unit determines that the earth pressure measured by any adjacent pair of the intermediate tail pressure gauges reaches the filling pressure, the injection of the backfill material from the backfill injection hole located therebetween may be stopped. Furthermore, in the backfill injection system of the present invention, 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, if the measured values of any one or both of the intermediate tail pressure gauges located on both sides do not reach the filling pressure, an injection status notification unit for giving an abnormality notification may be provided.

Advantages of the Invention

[0008] According to the present invention, since the injection pressure of the backfill material can be set and managed based on the actually acting earth pressure, the backfill injection into the tail void can be carried out without causing an excess or deficiency.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0010] Next, embodiments for carrying out the present invention (hereinafter simply referred to as "embodiments") will be specifically described with reference to the drawings. In the following embodiments, components having the same function are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. The shield tunneling machine 1 shown in FIG. 1 is an earth pressure balance shield tunneling 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 advancing direction. A rotating ring 4 is rotatably supported at the front of the skin plate 2 via a bearing portion such as a bearing. The cutter head 3 is connected to the rotating ring 4 via a connecting beam 5. A plurality of cutter turning motors 6 for rotating the rotating ring 4 are mounted on the skin plate 2. Thus, when the cutter turning motor 6 is rotationally driven, the cutter head 3 rotates via the connecting beam 5.

[0011] A partition wall 7 is provided on the skin plate 2 behind the cutter head 3, and a chamber 8 for filling the excavated soil and sand is formed between the cutter head 3 and the partition wall 7. The soil and sand excavated by the cutter head 3 fills the chamber 8 as earth and is carried out rearward by a screw conveyor 9.

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

[0013] The backfill injection system 20 of the present embodiment is a system for injecting and filling a backfill material into the tail void formed between the outer peripheral surface of the segment 11 and the ground.

[0014] Referring to Fig. 2, a plurality of backfill injection holes 13 for injecting backfill material into the tail void are provided in the tail of the skin plate 2. Simultaneously with the generation of the tail void due to the excavation of the shield tunneling machine 1, 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. In Fig. 2, six backfill injection holes 13 are formed at equal intervals of 45°, but there are no particular restrictions on the number and formation interval of the backfill injection holes 13. Also, in Fig. 2, the backfill injection pipe is piped inside the skin plate 2, and the backfill injection holes 13 are formed on the shaft-side end face of the skin plate 2. However, the backfill injection pipe may be piped on the inner peripheral surface or the outer peripheral surface of the skin plate 2, and the backfill injection holes 13 may be formed so as to protrude from the shaft-side end face of the skin plate 2 to the inner peripheral side or the outer peripheral side.

[0015] Referring to Fig. 2, the backfill injection system 20 includes a plurality of backfill injection devices 30 provided corresponding to the plurality of backfill injection holes 13 respectively, a plurality of tail intermediate pressure gauges 34 provided between adjacent backfill injection holes 13 respectively, and an injection control device 40 for individually controlling the plurality of backfill injection devices 30. Note that various materials and properties of backfill materials can be used. For example, it may be a two-component backfill material that mixes material A (main material) and material B (hardening material) immediately before injection to make it plastic or solidified, or it may be a one-component backfill material such as slag lime mortar or concrete.

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

[0017] As shown in FIGS. 3 and 4, the side pressure gauge 31 is attached to the outer peripheral surface of the skin plate 2 and measures the earth pressure acting on the outer peripheral surface of the skin plate 2 at the depth where the backfill injection hole 13 is provided. That is, the side pressure gauge 31 is attached at the same depth as the backfill injection hole 13. Therefore, as shown in FIG. 2, when a plurality of backfill injection holes 13 are formed at different depths, the earth pressure acting on the outer peripheral surface of the skin plate 2 at different depths is measured by the side pressure gauges 31 in the plurality of backfill injection devices 30.

[0018] As shown in FIG. 4, the tail pressure gauge 32 is attached near the backfill injection hole 13 provided at the tail of the skin plate 2 and measures the earth 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, the injection pressure of the backfill material injected from the backfill injection hole 13 into the tail void can be directly measured by measuring the earth pressure acting on the tail of the skin plate 2. That is, the tail pressure gauge 32 is attached at a position where the injection pressure of the backfill material injected from the backfill injection hole 13 into the tail void can be directly measured. Thereby, the injection pressure without the addition of piping resistance pressure can be accurately measured.

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

[0020] As shown in FIG. 4, the tail intermediate pressure gauge 34 is provided between adjacent backfill injection holes 13 provided at the tail of the skin plate 2 and measures the earth pressure acting on the tail of the skin plate 2. In the tail of the skin plate 2, the position between adjacent backfill injection holes 13 is the position where the backfill material injected and filled into the tail void reaches last. Therefore, when the earth pressure measured by the tail intermediate pressure gauge 34 rises to the filling pressure, it is possible to detect the completion of filling of the backfill material into the tail void. It should be noted that the arrangement of the tail intermediate pressure gauge 34 is preferably at the midpoint between adjacent backfill injection holes 13, but it may be slightly deviated.

[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. The transmission / reception unit 44 has functions of transmitting and receiving various information to and from a plurality of backfill injection devices 30 respectively, receiving the measurement results of a plurality of tail intermediate pressure gauges 34 respectively, and receiving the position information of the shield tunneling machine 1 from a position measuring device (not shown) using surveying instruments such as an optical distance measuring instrument (total station), a laser, and a gyro.

[0022] Also, the arithmetic unit 41 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 respective filling pressures in the plurality of backfill injection devices 30 based on the earth pressure and water pressure measured by the side pressure gauges 31 in the plurality of backfill injection devices 30. The filling pressure is set to a value larger than the measured earth pressure and water pressure. For example, a value obtained by adding a predetermined pressure set in advance to the measured earth pressure and water pressure is set as the filling pressure. Alternatively, a value obtained by multiplying the measured earth pressure and water pressure by one or more coefficients set in advance may be set as the filling pressure.

[0024] Note that the filling pressure may be a fixed value using the earth pressure and water pressure measured before the start of the injection of the backfill material, or a variable value using the earth pressure and 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 earth pressure and water pressure measured immediately before the start of the injection of the backfill material. Further, the filling pressure setting unit 411 associates and stores the measured earth pressure and water pressure with the position information from the position measuring device (not shown), and when setting the filling pressure using the earth pressure and water pressure measured when the side pressure gauge 31 is at the position of the backfill injection hole 13 before the start of the injection of the backfill material, an appropriate filling pressure according to the current situation can be set, which is more preferable.

[0025] Based on the position information from a position measuring device (not shown), the injection amount calculation unit 412 calculates the volume of the tail void for injecting and filling the backfill material as the total filling amount. Further, the injection amount calculation unit 412 calculates, as the individual filling amount, the value obtained by dividing the total injection amount by the number of the backfill injection devices 30. Note that 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 each backfill injection pump 33 in the plurality of backfill injection devices 30 such that the filling pressure in each of the plurality of backfill injection devices 30 set by the filling pressure setting unit 411 is equal to the earth pressure measured by the tail pressure gauge 32 in the plurality of backfill injection devices 30, respectively. When the earth 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. When the earth 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. Further, the injection control unit 413 measures the individual injection amount by integrating the discharge amount of the backfill material by the backfill injection pump 33 and outputs it to the injection status notification unit 414.

[0027] In addition, the injection control unit 413 monitors the measured values of the earth pressure by the plurality of tail intermediate pressure gauges 34, respectively. When the earth pressure measured by any of the tail intermediate pressure gauges 34 adjacent to each other across the backfill injection hole 13 (backfill injection device 30) reaches the filling pressure, the injection control unit 413 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 causes it to be displayed on the display unit 43. The injection status notification screen 50 includes an operation display column 51, an individual display column 52, an overall display column 53, and a contour display column 54 indicating the injection status of the backfill material.

[0029] In the operation display column 51, whether the plurality of backfill injection devices 30 are operating or stopped is indicated by being distinguished by characters, colors, marks, etc.

[0030] The individual display column 52 displays the respective filling pressures in the plurality of backfill injection devices 30 set by the filling pressure setting unit 411, the respective injection pressures (earth pressure and water pressure) measured by the tail pressure gauges 32 in the plurality of 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 plurality of backfill injection devices 30.

[0031] The overall display column 53 displays the overall filling amount calculated by the injection amount calculation unit 412 and the overall injection amount by the plurality of backfill injection devices 30.

[0032] The contour display column 54 displays the injection status of the backfill material in a contour manner. In the contour display column 54, the donut-shaped area is the overall filling amount area indicating the overall filling amount, and the area spreading from the inner circumference to the outer circumference within the overall filling amount area is the individual injection amount area indicating the overall injection amount. And the individual injection amount area has a shape corresponding 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. Also, on the injection status notification screen 50, the respective earth pressures and water pressures measured by the plurality of tail intermediate pressure gauges 34 may be displayed. By visualizing the injection status (injection pressure · injection amount) for each backfill injection hole 13 through the contour display column 54, the excess or deficiency of the injection pressure · injection amount becomes obvious at a glance.

[0033] In addition, when the individual injection amount reaches the individual filling amount, but the measured values of the tail intermediate pressure gauges 34 on both sides do not reach the filling pressure and the injection of the backfill material is not stopped for the injection control device 40, the injection status notification unit 414 issues an abnormality notification to the administrator. The abnormality notification is, for example, to color or blink the operation display column 51 or the individual display column 52 of the target injection control device 40 on the injection status notification screen 50. It may also be notified to the administrator's terminal. Through the abnormality notification, the administrator can recognize that the backfill material is flowing into other areas. At this time, if the injection of the backfill material is stopped before the individual injection amount reaches the individual filling amount in an area with a greater depth, it can be understood that the difference between the individual injection amount and the individual filling amount in that area may be continuously injected.

[0034] In addition, in this embodiment, one backfill injection device 30 is provided for one backfill injection hole 13. However, even if a plurality of backfill injection holes 13 are grouped by depth and one backfill injection device 30 is provided for each group, a certain effect can be obtained.

[0035] Also, in this embodiment, the injection control unit 413 is configured to drive and control the backfill injection pump 33 to automatically control the filling pressure by the backfill injection device 30. However, the drive control of the backfill injection pump 33 can also be manually performed by the administrator. In this case, the injection control unit 413 causes the display unit 43 to display the set value (such as the rotation speed of the motor) for the backfill injection pump 33 such that the earth pressure measured by the tail pressure gauge 32 becomes the filling pressure set by the filling pressure setting unit 411, and motor control information such as the increase / decrease amount and increase / decrease direction of the rotation speed. The administrator may manually perform the drive control of the backfill injection pump 33 based on the motor control information.

[0036] Furthermore, in this embodiment, the shield tunneling machine 1 has been described as an earth pressure balance shield tunneling machine. However, the present invention can also be applied to a slurry shield tunneling machine that stabilizes the face by applying a predetermined pressure to the slurry in the chamber and fluid-transports the excavated soil by circulating the slurry.

[0037] As described above, this embodiment is a backfill injection system 20 that injects a backfill material into the tail void from a plurality of backfill injection holes 13 provided in the tail of the skin plate 2, and includes a side pressure gauge 31 that is attached to the outer peripheral surface of the skin plate 2 and measures the earth pressure acting on the outer peripheral surface of the skin plate 2, a filling pressure setting unit 411 that sets a filling pressure based on the earth pressure measured by the side pressure gauge 31, a tail pressure gauge 32 that is attached to the tail and measures the earth pressure acting on the tail, and an injection control unit 413 that controls the injection pressure of the backfill material into the tail void such that the earth pressure measured by the tail pressure gauge 32 becomes the filling pressure set by the filling pressure setting unit 411. With this configuration, the injection pressure of the backfill material can be set and managed based on the actual acting earth pressure, so that the backfill injection into the tail void can be carried out without causing excess or deficiency.

[0038] Furthermore, in the present embodiment, a plurality of side pressure gauges 31 and tail pressure gauges 32 are attached, and the injection control unit 413 controls the injection pressure of each of the backfill materials injected from the plurality of backfill injection holes 13 based on the measured values of the corresponding side pressure gauges 31 and tail pressure gauges 32. With this configuration, the injection pressure of the backfill material from each of the plurality of backfill injection holes 13 can be set and managed, so that the backfill injection into the tail void can be carried out more accurately without causing excess or deficiency.

[0039] Furthermore, in the present embodiment, the side pressure gauges 31 and the tail pressure gauges 32 are respectively attached corresponding to the depths of the plurality of backfill injection holes 13. With this configuration, the injection pressure of the backfill material can be set and managed according to the depths of the plurality of backfill injection holes 13, so that the backfill injection into the tail void can be carried out even more accurately without causing excess or deficiency.

[0040] Furthermore, in the present embodiment, a plurality of tail intermediate pressure gauges 34 are provided between adjacent backfill injection holes 13 provided in the tail to measure the earth pressure acting on the tail, and the injection control unit 413 stops the injection of the backfill material from the backfill injection hole 13 located in the middle when any of the earth pressures measured by the adjacent tail intermediate pressure gauges 34 reaches the filling pressure. With this configuration, it is possible to accurately determine the completion of filling into the tail void.

[0041] Furthermore, in the present embodiment, an injection status notification unit 414 is provided that issues an abnormality notification when the measured values of any one or both of the tail intermediate pressure gauges 34 located on both sides do not reach the filling pressure even when 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. With this configuration, it is possible to notify an abnormality in filling the tail void at an appropriate timing.

[0042] As described above, the present invention has been described based on the embodiments. It is understood by those skilled in the art that these embodiments are examples, and various modifications are possible for combinations of their respective components, etc., and such modifications are also within the scope of the present invention.

Explanation of Reference Numerals

[0043] 1 Shield tunneling machine 2 Skin plate 3 Cutter head 4 Rotary ring 5 Connecting beam 6 Cutter slewing motor 7 Partition wall 8 Chamber 9 Screw conveyor 10 Jack 11 Segment 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 Calculation unit 42 Operation unit 43 Display unit 44 Transmission / reception unit 45 Bus 50 Injection status notification screen 51 Operation display column 52 Individual display column 53 Overall display column 54 Contour display column 411 Filling pressure setting unit 412 Injection amount calculation unit 413 Injection control unit 414 Injection status notification unit

Claims

1. A backfill injection system for injecting a backfill material into a tail void from a plurality of backfill injection holes provided in the tail of a skin plate, comprising: a side pressure gauge attached to the outer peripheral surface of the skin plate for measuring the earth pressure acting on the outer peripheral surface of the skin plate; a filling pressure setting unit for setting a filling pressure in a backfill injection device that supplies the backfill material to the backfill injection holes based on the earth pressure measured by the side pressure gauge; a tail pressure gauge attached to the tail for measuring the earth pressure acting on the tail; an injection control unit for controlling the injection pressure of the backfill material into the tail void so that the earth pressure measured by the tail pressure gauge becomes the filling pressure set by the filling pressure setting unit, wherein a plurality of the side pressure gauges and the tail pressure gauges are attached, and the injection control unit controls the injection pressure of each of the backfill materials injected from the plurality of backfill injection holes based on the measured values of the corresponding side pressure gauges and tail pressure gauges. The backfill injection system is characterized by this.

2. The backfill injection system according to claim 1, wherein the side pressure gauge and the tail pressure gauge are respectively attached corresponding to the depths of the plurality of backfill injection holes.

3. Comprising a plurality of tail intermediate pressure gauges respectively provided between adjacent backfill injection holes provided in the tail for measuring the earth pressure acting on the tail, wherein the injection control unit stops the injection of the backfill material from the backfill injection hole located in between when the earth pressure measured by any of the adjacent tail intermediate pressure gauges reaches the filling pressure. The backfill injection system according to claim 1 or 2 is characterized by this.

4. The backfill injection system according to claim 3, further comprising an injection status notification unit for performing an abnormality notification when the measured values of any one or both of the tail intermediate pressure gauges located on both sides do 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.

Images