JP2004244805A - Injection control device for backfilling material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection control device for a backfilling material capable of determining an injection quantity or injection pressure of the backfilling material by considering looseness of natural ground. <P>SOLUTION: This injection control device for the backfilling material injects the backfilling material by taking into consideration the looseness of the natural ground caused by an advance of boring, and has a probe part 12 movably arranged outward on an outer peripheral surface of a shield frame 2 and having a contact surface 13 in contact in the prescribed area with the side part natural ground, a detecting part 24 for measuring a change in a stroke when pressing the probe part 12 to the side part natural ground by moving outside the shield frame 2, and an arithmetic operation part 25 for arithmetically operating the injection quantity of the backfilling material based on the stroke when detecting the change in the stroke when the probe part 12 pushes back the looseness of the natural ground by the detecting part 24. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing material injection control device that injects a backing material in consideration of loosening of a ground caused by excavation.
[0002]
[Prior art]
As shown in FIG. 1, a shield machine 1 includes a cylindrical shield frame 2, a partition wall 3 provided at a front portion thereof, and a cutter 4 rotatably attached to the partition wall 3. Is driven to push the propulsion jack 5 in the shield frame 2 against the existing segment 6 to move forward. Further, in the muddy water shield excavator 1 as shown in the figure, a mud feeding pipe 7 and a mud draining pipe 8 are attached to the partition wall 3, and the excavated earth and sand is discharged as mud while keeping balance with the earth pressure water pressure of the face.
[0003]
The outer diameter of the cutter 4 is slightly larger than the outer diameter of the shield frame 2 in order to reduce the sliding resistance between the inner peripheral surface of the digging hole cut by the cutter 4 and the outer peripheral surface of the shield frame 2. Is set. For this reason, as shown in FIG. 4, a predetermined extra dug clearance X is formed between the inner peripheral surface of the excavation hole 9 cut by the cutter 4 and the outer peripheral surface of the shield frame 2. The segments 6 are assembled in a ring shape by an unillustrated erector inside the shield frame 2. Therefore, a predetermined interval (tail void Y) including the above-mentioned excavation clearance X is formed between the outer peripheral surface of the segment 6 and the inner peripheral surface of the excavation hole 9.
[0004]
The tail void Y is calculated by subtracting the outer diameter of the existing segment 6 from the outer diameter of the cutter 4. Then, a backing material (quick-acting concrete or the like) is injected into the tail void Y from a backing material injection device 10 provided at a rear portion or the like of the shield frame 2 in an amount corresponding to the tail void Y, thereby preventing collapse of the ground. are doing.
[0005]
Note that Patent Document 1 and the like are known as related prior art documents.
[0006]
[Patent Document 1]
JP-A-5-141915
[Problems to be solved by the invention]
When the ground is excavated by the shield machine 1, the ground is stimulated, so that the ground outside the excavation hole 9 is loosened.
[0008]
On the other hand, since the tail void Y calculated as described above does not consider the looseness of the ground at all, even if the backing material in an amount corresponding to the calculated tail void Y is simply injected, the loose ground is collapsed. Can not be suppressed, the collapse of the ground may occur. In order to avoid this, it is necessary to inject a backing material that is increased to some extent from the amount corresponding to the calculated tail void Y.
[0009]
However, it was unclear how much the amount could be increased to prevent the loosening of the loose ground, so it was necessary to increase the amount with a margin to avoid the collapse without fail, causing a cost increase. I was In addition, when the backing material is increased and injected in this way, a part of the backing material wraps around the face side (the cutter 4 side), and in the case of the muddy shield excavator 1, the properties of the muddy water are deteriorated. Had become.
[0010]
SUMMARY OF THE INVENTION An object of the present invention, which has been made in view of the above circumstances, is to provide a backing material injection control device capable of obtaining the backing material injection amount or injection pressure in consideration of the loosening of the ground. is there.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a first invention is a backing material injection control device for injecting a backing material in consideration of loosening of a ground caused by excavation, wherein the backing material injection control device includes an outer peripheral surface of a shield frame. A probe portion having a contact surface movably provided on the side ground and having a predetermined area, and a change in stroke when the probe portion is moved to the outside of the shield frame and pressed against the side ground. A detecting unit for measuring, and a calculating unit for calculating an injection amount of the backing material based on the stroke when the detecting unit detects a change in a stroke when the probe unit pushes back the looseness of the ground. It is a thing.
[0012]
The detection unit detects a first stroke limited when the probe unit contacts the side ground, and then detects a second stroke limited when pushing back the loose side ground. And the calculation unit may calculate the injection amount of the backing material based on the second stroke.
[0013]
The detection unit includes a sensor that measures a pressure received by the probe unit from the side ground when the second stroke is detected, and the calculation unit determines an injection pressure of the backing material based on the pressure. The calculation may be performed.
[0014]
A second invention is a backing material injection control device for injecting a backing material in consideration of loosening of the ground caused by excavation, wherein the backing material injection control device is provided on an outer peripheral surface of a shield frame so as to be movable outward. A probe unit having a contact surface that makes contact with the ground at a predetermined area, a detector that measures a change in pressure when the probe is moved to the outside of the shield frame and pressed against the side ground, When the detecting unit detects a change in pressure when the probe unit pushes back the looseness of the ground, a calculating unit that calculates the injection pressure of the backing material based on the detected pressure is provided.
[0015]
The detection unit detects a first pressure that rises when the probe unit contacts the side ground, and then detects a second pressure that rises when the loose side ground is pushed back, The calculating section may calculate the injection pressure of the backing material based on the second pressure.
[0016]
The detection unit has a sensor that measures a stroke of the probe unit when the second pressure is detected, and the calculation unit calculates an injection amount of the backing material based on the stroke. Is also good.
[0017]
The probe unit may be formed of a bag that expands and contracts when a fluid enters and exits the probe. The bag may be continuously formed in a belt shape along the circumferential direction of the shield frame. A plurality of the bag bodies may be provided intermittently along the circumferential direction of the shield frame. A steel plate may be provided at a portion of the bag body that contacts the side ground. A backflow prevention plate may be provided at the front part of the bag body so as to be bent around the front part as a fulcrum.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the accompanying drawings.
[0019]
The backing material injection control device 11 according to this embodiment is attached to the shield machine 1 shown in FIGS. 1 to 5 described above.
[0020]
As shown in FIGS. 4 and 5, the injection control device 11 has a probe unit 12 provided on the outer peripheral surface of the shield frame 2 so as to be movable in the radial direction. The probe section 12 has a contact surface 13 that contacts the side ground (the inner peripheral surface of the excavation hole 9) with a predetermined area. In the present embodiment, the probe section 12 is formed of a bag body (rubber or the like) that expands and contracts when a fluid enters and exits. As shown in FIG. 2, the bag body 14 may be continuously formed in a belt shape along the circumferential direction of the shield frame 2, and intermittently along the circumferential direction of the shield frame 2 as shown in FIG. May be provided in plurality.
[0021]
More specifically, the bag body 14 is formed of a film made of rubber or the like formed along the circumferential direction of the shield frame 2, and its front edge and rear edge are fixed to the shield frame 2 by anchors 15 and 16, respectively. It is configured. The bag body 14 is attached to a concave portion 17 provided in the shield frame 2 in order to avoid contact abrasion with the side ground when the bag body contracts. The concave portion 17 is formed by cutting off a part of the shield frame 2 in a ring shape, and interposing a connecting plate 19 formed in a ring shape having a U-shaped cross section in the cutout portion 18. A front block 20 and a rear block 21 are attached to the connecting plate 19 by bolts, respectively. The front edge of the bag 14 is fixed to the front block 20 with the anchor 15, and the bag The trailing edge of 14 is fixed by an anchor 16.
[0022]
The connecting plate 19 is provided with a pipe 22 for injecting and discharging a fluid (silicon oil, water, gas, air, etc., the same applies hereinafter) into the inside of the bag body 14. As shown in FIG. 6, a pump 23 for injecting a fixed amount of fluid per unit time into the bag body 14 is connected to the pipe 22. As shown in FIG. 2 or FIG. 3, a plurality of pipes 22 are provided at predetermined intervals in a circumferential direction of the shield frame 2 in order to inject fluid evenly into the bag body 14. The bag body 14 expands when the fluid is injected, and a part of the bag body 14 comes into contact with the side ground (the inner peripheral surface of the excavation hole 9). This portion becomes the contact surface 13 of the probe unit 12.
[0023]
The rear block 21 is provided with a detection unit 24 for measuring the radial bulging amount (radial stroke) when the bag body 14 is inflated and pressed against the side ground (the inner peripheral surface of the excavation hole 9). ing. The detection unit 24 includes an ultrasonic range finder, a laser range finder, an electromagnetic range finder, or the like. The detecting unit 24 includes a calculating unit 25 that calculates a filling amount of the backing material based on the stroke when detecting a fluctuation of a stroke when the bag body 14 pushes back the loose ground to the original state. It is connected. The calculation unit 25 operates the backing material injection pump 26 so as to match the calculated injection amount.
[0024]
Specifically, as shown in FIG. 6, when a certain amount of fluid is injected into the bag body 14 per unit time by the pump 23, the bag body 14 gradually expands, and the radial expansion amount (radial stroke) increases. Become. When the amount of bulge in the radial direction becomes the excess digging clearance X shown in FIGS. 4 and 5, a part of the bag body 14 (the contact surface 13) comes into contact with the inner peripheral surface of the digging hole 9, and The amount of bulge is limited. The amount of radial expansion of the limited bag body 14 is detected by the detecting unit 24, and this is defined as a first stroke.
[0025]
Thereafter, the fluid flowing into the bag body 14 causes the bag body 14 to expand not in the radial direction but in the axial direction (the left-right direction in FIG. 5). Then, if the internal pressure of the bag body 14 becomes equal to or higher than the pressure for pushing up the loosened earth and sand due to the excavation by the fluid that continues to flow, the bag body 14 expands again in the radial direction as shown in FIG. Then, if the bag body 14 pushes the loose earth and sand back to the original state (closed compaction state) by the fluid that continues to flow, the radial expansion of the bag body 14 is thereafter limited by the closed earth and sand. Is done. The amount of radial expansion of the limited bag body 14 is detected by the detection unit 24, and this is defined as a second stroke.
[0026]
That is, as shown in FIG. 6, when the fluid is injected into the bag 14 at a constant rate, the amount of radial expansion of the bag 14 (radial stroke) rises with the injection of the fluid, and the remaining amount shown in FIG. Saturate once with the dig clearance X (first stroke), rise again by continuing fluid injection, and saturate again when the stroke (second stroke) that pushes loose earth and sand back to its original state (tight compaction state) I do. Then, the detecting unit 24 detects the first saturated stroke as the first stroke, and detects the next saturated stroke as the second stroke.
[0027]
The first and second strokes are input to the calculation unit 25. The calculation unit 25 calculates a tail void (simple void Y + loose void Z in FIG. 5) in consideration of the looseness of the ground, based on the second stroke and the outer diameter of the existing segment 6. Then, the injection amount of the backing material is calculated in consideration of the calculated tail void (Y + Z) and the forward speed of the propulsion jack 5. Then, the backing material injection pump 26 is controlled so that the injection amount is obtained. Thereby, the backing material can be injected at an injection amount in consideration of the looseness of the ground. Therefore, it is possible to prevent loose ground collapse while minimizing the consumption of the backing material.
[0028]
Further, when the backing material was injected, the bag body 14 was inflated to seal a ring shape between the inner peripheral surface of the excavation hole 9 and the entire periphery thereof, thereby being discharged from the tail portion of the shield frame 2. The backing material can be prevented from moving forward along the shield frame 2 and wrapping around the face (the cutter 4 side). Therefore, it is possible to avoid the deterioration of the properties of the muddy water caused by mixing the backing material with the muddy water of the muddy shield machine 1.
[0029]
Further, when the detection unit 24 detects the second stroke, the internal pressure of the bag body 14 (the pressure received by the probe unit 12 from the side ground) is measured by a pressure sensor 40 interposed in the pipe 22 or the like. The backing material may be injected at a pressure equal to the pressure. In this case, the calculation unit 25 sets the discharge pressure of the backing material injection pump 26 to the internal pressure of the bag body 14 during the second stroke. Thereby, the backing material can be injected with the injection pressure in consideration of the looseness of the ground.
[0030]
FIG. 9 shows a configuration in which a steel plate 27 is provided in a portion of the bag body 14 that contacts the side ground. The plurality of steel plates 27 are arranged in a strip shape at predetermined intervals in the circumferential direction of the shield frame 2 to allow the bag body 14 (rubber or the like) to expand and contract. With the steel plate 27, even if the bag body 14 is kept inflated while the shield machine 1 is excavating, the bag body 14 can be prevented from being damaged and worn by the inner peripheral surface of the excavation hole 9. Therefore, leakage of the backing material to the face side can always be sealed.
[0031]
FIG. 8 shows a configuration in which a backflow prevention plate 28 is provided at the front of the bag body 14 so as to be able to freely bend with the front part as a fulcrum. A steel plate (not shown) is provided on the inner or outer surface of the backflow prevention plate 28 to maintain the shape of the backflow prevention plate 28 when the backflow prevention plate 28 is pressed against the inner peripheral surface of the excavation hole 9. I have. A plurality of steel plates are arranged in a strip shape at predetermined intervals in the circumferential direction of the shield frame 2 to allow the bag body 14 (rubber or the like) to expand and contract.
[0032]
By providing such a backflow prevention plate 28, even if the bag body 14 is kept in an inflated state while the shield machine 1 is excavating, the bag body 14 can be prevented from being damaged or worn by the inner peripheral surface of the excavation hole 9 while being protected. The backing material injected from the tail side of the shield frame 2 can be reliably prevented from flowing back to the face side. However, in this case, the amount of bulging in the radial direction (radial stroke) of the bag body 14 measured by the detecting unit 24 does not match the actual clearance to the side ground. Needs to be multiplied by the correction coefficient.
[0033]
FIG. 10 shows a case where a cylinder 30 is used as the terminal portion 12 instead of the bag body 14 as in the previous embodiments. The cylinder 30 includes a head part 31 attached to the inner peripheral surface of the shield frame 2, a piston part 32 provided on the head part 31 and protruding and retracting by injecting a fluid into the head part 31, and a piston part 32. A pressure receiving portion 33 provided at the tip and in contact with the inner peripheral surface of the excavation hole 9 at a predetermined contact surface (pressure receiving area).
[0034]
The pressure receiving portion 33 is formed in an arc plate shape in accordance with the curvature of the excavation hole 9 (substantially equal to the curvature of the shield frame 2). The pressure receiving area of the pressure receiving portion 33 is such that when the piston portion 32 is projected radially outward from the head portion 31 and the pressure receiving portion 33 is pressed against the inner peripheral surface of the excavation hole 9, the ground is not fitted into the ground. The size is set so that it is possible to judge looseness and tightness of the ground by holding down.
[0035]
In other words, if the pressure receiving area of the pressure receiving portion 33 is too small, it will not fit into the ground when protruding outward in the radial direction, so it cannot be determined whether the ground is loose or tight. A protective film 34 is provided between the pressure receiving portion 33 and the shield frame 2. This is to prevent earth and sand from biting between the pressure receiving portion 33 and the shield frame 2 when the piston portion 32 is contracted.
[0036]
As shown in FIG. 7, a fixed amount of fluid (silicon oil or the like) is injected into the head portion 31 of the cylinder 30 by a pump 23 per unit time. As a result, the piston portion 32 gradually protrudes, and the pressure receiving portion 33 hits the inner peripheral surface of the excavation hole 9. Then, since the protrusion of the piston portion 32 is restricted, the internal pressure of the head portion 31 rises. This is defined as a first pressure. The first pressure is detected by a detection unit (pressure sensor) 35 provided between the head unit 31 and the pump 23.
[0037]
Thereafter, the piston portion 32 is protruded by the fluid continuously flowing into the head portion 31 while consolidating the ground loosened by the pressure receiving portion 33, and the loose ground returns to the original state (closed consolidation state). When it protrudes to the maximum, the protrusion is restricted by the ground that has been tightened and compacted. Therefore, the internal pressure of the head portion 31 further rises at that point. This is the second pressure. The second pressure is detected by the detection unit 35.
[0038]
That is, as shown in FIG. 7, when a fluid is injected into the head portion 31 of the cylinder 30 at a constant rate, the internal pressure of the head portion 31 rises when the pressure receiving portion 33 comes into contact with the inner peripheral surface of the excavation hole 9 ( (First pressure), and further rises when the pressure receiving part 33 is pushed up until the loose ground reaches the original state (tight compaction state) (second pressure). Then, the detecting unit 35 detects the first pressure change point as the first pressure, and detects the next pressure change point as the second pressure.
[0039]
The first and second pressures are input to the calculation unit 36. The calculation unit 36 sets the discharge pressure of the backing material injection pump 26 to a pressure equal to the second pressure. Thereby, the backing material can be injected at the injection pressure in consideration of the loosening of the ground, and the collapse of the loose ground can be reliably prevented, and the consumption of the backing material can be minimized. .
[0040]
When the detecting unit 35 detects the second pressure, the protruding length of the piston 32 is measured by a sensor built in the cylinder 30, and based on the protruding length and the outer diameter of the existing segment 6, The tail void (Y + Z) is calculated in consideration of the looseness, and the injection amount of the backing material in consideration of the looseness of the ground is calculated in consideration of the calculated tail void (Y + Z) and the forward speed of the propulsion jack 5. The backing material injection pump 26 may be controlled so as to achieve the injection amount.
[0041]
【The invention's effect】
As described above, according to the backing material injection control device of the present invention, the injection amount or the injection pressure of the backing material can be obtained in consideration of the loosening of the ground. Therefore, the collapse of the ground can be reliably prevented while minimizing the consumption of the backing material.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a shield machine including a backing material injection control device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a shield machine equipped with the backing material injection control device.
FIG. 3 is a cross-sectional view of a shield machine showing a modification.
FIG. 4 is a side sectional view of the backing material injection control device (before operation).
FIG. 5 is a side sectional view of the backing material injection control device (after operation).
FIG. 6 is an operation explanatory view of the backing material injection control device (stroke type).
FIG. 7 is an operation explanatory view of the backing material injection control device (pressure type).
FIG. 8 is a side sectional view showing a modification.
FIG. 9 is a side sectional view showing a modification.
FIG. 10 is a side sectional view showing a modification.
[Explanation of symbols]
2 Shield frame 11 Injection control device 12 Probe unit 13 Contact surface 14 Bag body 24 as probe unit Detecting unit 25 Calculating unit 27 Steel plate 28 Backflow prevention plate 30 Cylinder 35 as probe unit Detecting unit 36 Calculating unit

Claims (11)

A backing material injection control device for injecting a backing material in consideration of loosening of the ground caused by excavation, wherein the backing material injection control device is provided on the outer peripheral surface of the shield frame so as to be movable outward and has a predetermined area with a side ground. A probe unit having a contact surface contacted by a detector, a detector for measuring a change in stroke when the probe is moved to the outside of the shield frame and pressed against the side ground, and the detector is used to detect the change in stroke. And a calculating unit for calculating a filling amount of the backing material based on the stroke when a change in the stroke when the looseness of the ground is pushed back is detected. . The detection unit detects a first stroke limited when the probe unit contacts the side ground, and then detects a second stroke limited when pushing back the loose side ground. 2. The backing material injection control device according to claim 1, wherein the calculating section calculates the backing material injection amount based on the second stroke. The detection unit includes a sensor that measures a pressure received by the probe unit from the side ground when the second stroke is detected, and the calculation unit determines an injection pressure of the backing material based on the pressure. 3. The backing material injection control device according to claim 2, wherein the operation is performed. A backing material injection control device for injecting a backing material in consideration of loosening of the ground caused by excavation, wherein the backing material injection control device is provided on the outer peripheral surface of the shield frame so as to be movable outward and has a predetermined area with a side ground. A probe section having a contact surface contacting the probe section, a detection section for measuring a change in pressure when the probe section is moved to the outside of the shield frame and pressed against the side ground, and the probe section is used by the detection section. And a calculating unit for calculating a filling pressure of the backing material based on the detected pressure change when the looseness of the ground is pushed back. . The detection unit detects a first pressure that rises when the probe unit contacts the side ground, and then detects a second pressure that rises when the loose side ground is pushed back, 5. The backing material injection control device according to claim 4, wherein the calculation unit calculates the backing material injection pressure based on the second pressure. The said detection part has a sensor which measures the stroke of the probe part at the time of detecting the said 2nd pressure, The said calculation part calculates the injection | pouring amount of backing material based on the stroke. Item 6. A backing material injection control device according to Item 5. 7. The backing material injection control device according to claim 1, wherein the probe unit comprises a bag body which expands and contracts when a fluid is taken in and out. The backing material injection control device according to claim 7, wherein the bag is formed in a continuous band along the circumferential direction of the shield frame. The backing material injection control device according to claim 7, wherein a plurality of the bag bodies are provided intermittently along a circumferential direction of the shield frame. 10. The backing material injection control device according to claim 8, wherein a steel plate is provided in a portion of the bag body that comes into contact with the side ground. 10. The backing material injection control device according to claim 8, wherein a backflow prevention plate is provided at a front portion of the bag body so as to be bent around the front portion as a fulcrum.

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