KR0175170B1 - The soil fludity and viscosity controller for earth pressure shield tunneling machine - Google Patents

Abstract

An object of the present invention is to provide a soil improvement control device capable of finely adjusting the degree of improvement of soil in a chamber of a seal excavator.

The improvement agent 12 and the improvement aid 14 of the amount calculated from the excavation speed of the seal excavator 1 and the rotation speed of the screw conveyor 7 are injected into the excavated soil. Then, according to the rotational force of the screw conveyor 7, the opening degree of the top gate 8 is adjusted, the screw conveyor 7 is repeated, and the forward and reverse rotation, the injection amount of the improved chemical is adjusted, or the screw conveyor 7 Adjust the speed. If the torque does not rise, the whole device is stopped.

Description

Soil improvement controller in sealed excavator

1 is a side view of a shield excavator equipped with a soil improvement control device in the seal excavator according to one embodiment of the present invention.

FIG. 2 is a flowchart illustrating the soil improvement method in the seal excavator shown in FIG.

* Explanation of symbols for main parts of the drawings

1: Sealed excavator 3: Cutter head

4: chamber 6: speedometer

7: screw conveyor 8: top gate

9 tachometer 11 tachometer

13: improved feed pump 15: improved feed pump

17 controller for control

The present invention relates to a soil improvement control apparatus in a seal excavator that can appropriately control the degree of improvement of the excavated soil.

Conventionally, when excavating a mining site in which groundwater pressure is acted on by a seal excavator, a soil improver is added to the excavated soil and the soil is disposed of by a screw conveyor. Soil plugs are formed inside the casing, and the plugs maintain ground pressure against groundwater pressure within the chamber provided behind the cutter head, thereby allowing ground water to be ejected or more than necessary soil is contained in the chamber. Preventing is implemented.

By the way, in such a conventional apparatus, the soil quality cannot be finely adjusted to an appropriate state with time, and the risks, such as the discharge of groundwater, were not completely eliminated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a soil improvement control device in a seal excavator that can finely adjust the degree of improvement of the soil quality discharged by the shield excavator to an appropriate degree. will be.

That is, the soil improvement control apparatus in the seal excavator of the present invention, first, is carried out by the screw head which is excavated by the cutter head provided in the front part and taken in into the chamber from the inside of the camber by the screw conveyor. In a seal excavator for discharging from a screw conveyor, a screw injection means for injecting an improved drug into the soil to improve the soil quality of the discharged soil, and the amount of injection of the above-mentioned improved drug by the medicine injection means And an injection amount control means for controlling the discharge amount from the right conveyor.

In addition, the soil improvement control device in the seal excavator of the present invention, secondly, is excavated by the cutter head provided in the front portion and carried out from the inside of the chamber by a screw conveyor, which is excavated into the chamber. In a seal excavator for discharging through a gate from a screw conveyor, a drug injection means for injecting a modified drug into the soil to improve the soil quality of the discharged soil, and a rotation force detecting means for detecting the rotational force of the screw conveyor described above. And recovery means for restoring the properties of the earth and sand so that when the rotational force detected by the rotational force detecting means is smaller than the reference rotational power corresponding to the desired soil, the rotational force recovers up to the reference rotational power.

The amount of excavated soil to be improved in order to prevent the discharge of groundwater and the like is approximately equal to the amount of excavated soil from the screw conveyor. Therefore, according to the soil improvement control apparatus in the seal excavator of this invention which has a 1st characteristic, since the injection amount of an improved chemical | medical agent is controlled according to the discharge amount from a screw conveyor, the appropriate amount of improved chemical required for improvement is excavated. The slump value is always kept below a certain value because it is added to the soil and the soil is improved to an optimum state. Therefore, the groundwater is prevented from being ejected or the soil is contained inside the chamber more than necessary.

In the soil improvement control apparatus of the shield excavator of the present invention having such a first characteristic, the discharge amount from the screw conveyor is calculated from the excavation speed of the shield excavator, calculated from the rotation speed of the screw conveyor, Alternatively, it can be determined from the speed of the seal excavator and the number of revolutions of the screw conveyor described above. The amount of soil discharged per unit time is calculated by empirically obtaining this excavation speed or rotational speed. When the excavation speed, the rotation speed and the excavation amount are not completely proportional to each other, more accurate values can be obtained by calculating the excavation amount from both the excavation speed value and the rotation speed value.

In addition, the improvement degree of the soil is considered to be proportional to the rotational force of the screw conveyor. Therefore, according to the soil improvement control apparatus of the shield excavator of the present invention having the second feature, the improvement of soil quality can be grasped over time by the rotational force of the screw conveyor being detected by the rotational force detecting means, If the rotational force measured is smaller than the reference rotational power corresponding to the required degree of improvement, since the operation for achieving the reference rotational power by the recovery means is carried out in accordance with the improvement of the soil quality, the desired soil quality is always maintained.

The recovery means of the seal excavator according to the second aspect of the present invention is to reduce or close the opening degree of the gate, to repeat and rotate the screw of the screw conveyor forward and backward, and to improve the soil quality. In order to increase the injection amount of the improved medicine to be injected, or to increase the screw rotation speed of the screw conveyor. The smaller the opening degree of the gate is for retaining more soil in the screw conveyor, thereby increasing the degree of compression of the soil in the screw conveyor. In addition, the forward and reverse rotation of the screw of the screw conveyor is to improve the improvement effect by mixing the improved chemical and earth and sand during the repetition of the forward and reverse rotation. In addition, increasing the injection amount of the improvement aid is intended to solve the shortage of the injection amount due to the change of soil and to increase the degree of curing. Incidentally, the rotational speed of the screw conveyor is increased to increase the degree of compaction of the soil by increasing the amount of soil to stay in the screw conveyor. If the above recovery means performs these operations in combination of two or more, it is possible to efficiently recover the rotational force and improve the soil quality.

In addition, in the soil improvement control apparatus of the seal excavator with this second characteristic, when the rotational force of the screw conveyor is small, even if the operation by the above-mentioned recovery means is performed to some extent, the rotational force is applied to the reference rotational power. If not reached, stops the operation of the shield excavator and this soil improvement control. In this way, when the rotational force does not rise, there is a possibility that some special reason or abnormality is occurring. Therefore, the operation is stopped and the inspection is performed.

The soil improvement control device in the seal excavator of the present invention having such an automatic stop mechanism can be said to be a safe device.

EXAMPLE

Next, specific examples of the soil improvement control device in the shield excavator according to the present invention will be described with reference to the drawings.

1, the side view of the shield excavator 1 provided with the soil improvement control apparatus in the seal excavator which concerns on this invention is shown. The shield excavator 3 is provided with a cutter head 3 which is rotated by a cutter head motor 2 at its front part. Behind this cutter head 3, the chamber 4 in which the earth and sand excavated by the cutter head 3 is accommodated is provided. Moreover, the shield jack 5 which provides the thrust force for the shield excavator 1 to drill in the ground is provided in the lower part. The excavation speed of the shield excavator 1 by this shield jack 5 is measured by the speedometer 6 provided in the vicinity of the shield jack 5.

Moreover, the screw conveyor 7 is provided so that the inside of the shield excavator 1 may penetrate toward the back of the shield excavator 1 from the lower part of the chamber 4. This screw conveyor 7 is bent in the middle, as shown in the figure, and the front part is provided in the inclined state so that it may rise from the lower part of the chamber 4, and the back part is provided horizontally. And the back gate 8 which can adjust an opening degree is provided in the rear end part of this screw conveyor 7. As shown in FIG. Moreover, the rotation system 9 for measuring the rotation speed of the screw conveyor 7 is provided in front of the top gate 8. Moreover, the screw conveyor motor 10 which rotates the screw conveyor 7 is provided, and the rotational force meter 11 which detects the rotational force of the screw conveyor motor 10 is provided.

In addition, the improved topic supply pump 13 and the above-described screw conveyor for supplying the improved topic (improved agent) to the earth and sand contained in the chamber 4 through the main supply path 12. (7) Improved preparation supply pumps 15 are provided for supplying improved preparations (improved medicines) to the earth and sand being conveyed from the inside through the preparation supply path 14.

Then, the signals from the speedometer 6, the tachometer 9, and the tachometer 11 are received, and the above-described baitgate 8 and the screw are processed by processing the signals according to the control information 16 previously input. The control controller (sequence) 17 which transmits each control signal to the right conveyor motor 10, the improved theme feed pump 13, and the improved preparation feed pump 15 is provided.

The operation in this sealed excavator 1 will be described below.

First, while the shield excavator 1 is driven by the shield jack 5, the cutter head 3 is rotated by the cutter head motor 2 to accommodate the excavated soil inside the chamber 4. do. The soil to be accommodated is taken out from the inside of the chamber 4 by the rotating screw conveyor 7 and passes through the top gate 8 of the rear end of the screw conveyor 7 to the discharge area not shown in the drawing. do.

In this state of excavation, the excavation speed V of the shield excavator 1 is measured by the speedometer 6, and the measured value is sent to the controller 17 for control. The amount of excavated soil is considered to be roughly proportional to the excavation speed (V), and the amount of improved and supplementary aid supplied to improve the soil quality of the soil is added according to the excavated soil amount. It can be calculated from the excavation speed (V) of the de excavator 1. That is, the control output P1 supplied to the improved topic feed pump 13 to control the supply amount of the improved topic and the control output P2 supplied to the improved formula feed pump 15 to control the supply volume of the advanced formula In the control controller 17, it is calculated according to the following equation.

P1 = K1V + α1

P2 = K2V + α2

(K1, K2, α1, α2 are integers)

Here, the constants K1 and K2 are mainly determined according to the properties of the soil to be improved, and α1 and α2 are effective when used to correct the control characteristics in the microdischarge amount region of each of the drug supply pumps 13 and 15. . In addition, these constants are set arbitrarily by an operator according to the properties of earth and sand.

Then, an appropriate amount of improved theme is supplied to the soil in the chamber 4 through the main supply path 12 to improve the soil quality from the improved theme supply pump 13 receiving the calculated control output P1. From the improved preparation feed pump 15, which has received P2), an appropriate amount of improved aid is supplied to the soil in the screw conveyor 7 for the improvement of the soil quality through the preparation supply path 14. In this way, the soil to which the improved subject matter and the improved aid are supplied and the soil quality is improved is discharged from the discharge gate 8 opened at a predetermined opening degree.

In addition, it is thought that the amount of discharging is approximately proportional to the rotation speed N of the screw conveyor 7, and is measured by the rotation system 9 instead of the excavation speed V of the seal excavator 1 described above. From the rotation speed N of the screw conveyor 7, the control output P1 (P2) mentioned above by the control controller 17 can be calculated by following Formula.

P1 = K3V + α3

P2 = K4V + α4

(K3, K4, α3, α4 are integers)

In addition, depending on the quality of the soil to be excavated, the type of shield excavator, and the like, the amount of discharge may be more accurately proportional to either of the excavation speed V or the rotation speed N. Moreover, the area | region of the discharge amount which is proportionally more accurate with the excavation speed V, or the area | region of the discharge amount which is proportionally proportional to the rotation speed N may change with some extent of the discharge amount. In this case, both of the excavation speed V and the rotation speed N are measured, and according to the situation at that time, the one having a more accurate proportional relationship can be selected to calculate the amount of clay.

In addition, the above-mentioned constants for calculating the amount of dust are input to the control controller 17 in advance as the control information 16.

As described above, in the state where the soil to which the improvement subject and the improvement aid are supplied is discharged from the top gate 8, the rotational force T for the screw conveyor motor 10 to rotate the screw conveyor 7 is reduced. It is measured by the tachometer 11. The rotational force (T) is considered to be correlated with the degree of improvement of the soil, and the degree of improvement of the soil can be known by comparing the reference rotational force (TO) and the measured rotational force (T) according to the target improvement of the soil. Here, if the opening degree of the above-mentioned discharge gate 8 is made small, the discharge amount of the earth and sand will decrease, and more soil will stay in the screw conveyor 7, and the soil will be compressed and hardened, and the rotation force T will become large. When the opening degree is increased, the soil is discharged in large quantities, and the soil inside the screw conveyor 7 is softened without being excessively compressed, and the rotational force T is reduced, so that the top gate 8 The amount δG (t) for adjusting the opening degree G (t) of) can be calculated by the following equation.

δG (t) = K5 (T-TO) (K5 is an integer)

ΔG (t) calculated as described above is sent to the batter gate 8 as a control output P3, and the opening degree of the batter gate 8 is adjusted so that the required reference rotational force TO is achieved, and the improvement of soil quality is achieved. Is optimized.

From the rotational force T measured by the tachometer 11, the control outputs P1 and P2 (the reference rotational force TO) for the above-mentioned improved topical supply pump 13 and improved auxiliary supply pump 15 are determined. The control output to achieve) is calculated, and the degree of improvement of the soil may be optimized by controlling the supply amounts of the improved and improved auxiliaries. That is, when the supply amount of the improved subject matter and the improved aid increases, the rotational force T becomes large, and when the supply amount decreases, the rotational force T becomes small.

In addition, soil quality is also adjusted by changing the rotation speed of the screw conveyor 7, and rotating the screw conveyor 7 by forward and reverse rotation. If the top gate is closed and the rotation speed of the screw conveyor 7 is increased, the improvement of the improvement effect is enhanced by increasing the density of the soil retained inside the screw conveyor 7, and when the rotation speed decreases, the density of the retained soil is reduced by the decrease. Improvement effect is reduced. In addition, by repeating the forward and reverse rotation of the screw conveyor 7, the improvement agent and the earth and sand are sufficiently mixed and the improvement effect is increased. Therefore, as described above, the rotation speed of the screw conveyor 7 is adjusted to some extent in order to harden or soften the earth and sand to achieve the rotational force TO from the rotational force T measured by the tachometer 11. Or, the control controller 17 judges and calculates how much the screw conveyor 7 rotates forward and backward in order to harden the soil, and the control output for adjusting the rotation speed or performing reverse rotation. P4 or P5 is sent to the screw conveyor motor 10 mentioned above.

The operation of hardening or softening the soils as described above, that is, opening and closing the top gate 8, increasing and decreasing the supply amount of the improved theme and the improvement aid, increasing and decreasing the rotational speed of the screw conveyor 7, and reverse rotation of the screw conveyor arbitrarily You may combine. For example, when hardening the soil, it is conceivable that the top gate 8 is completely closed for a certain time, and a combination of the other three devices described above is used. In addition, the parameters for calculating the control outputs P1 to P5 from the measured rotational force T, the reference rotational power TO and the like are input to the control controller 17 as the control information 16 as described above.

In addition, in the above, the discharge amount was calculated from the excavation speed of the seal excavator 1 and the rotation speed of the screw conveyor 7, but the discharge amount of the earth and sand discharged from the rear end of the screw conveyor 7 was calculated. A device that can measure directly may be installed.

In addition, as described above, the operation of controlling the supply amount of the improved subject matter and the improved aid according to the speed of the seal excavator 1 and the rotational speed of the screw conveyor 7, the rotation force measured by the rotometer 11 According to (T), each operation of hardening or softening the soil may be carried out at regular intervals, or may be carried out continuously.

In addition, as described above, when the rotational force T does not reach the reference rotational force TO even when the soil improvement operation is performed, there is a possibility that some abnormality may occur. As a result, the drilling operation and the soil improvement are impossible. All control operations are stopped.

Here, an example of the operation in the shield excavator 1 provided with the soil improvement control device of the shield excavator according to the present embodiment described above will be explained by the flowchart art shown in FIG. do.

S1 to S5: after the automatic improvement switch for improving soil quality is turned on and the above-mentioned reference rotational force TO is set as a control management value, it is proportional to the excavation speed V of the shield excavator 1. The excavation is carried out while injecting the improved agent and the improved aid of the amount calculated so as to measure the rotational force T for rotating the screw conveyor 7 during this excavation.

S6: The rotational force T for rotating the screw conveyor 7 is compared with the reference rotational force TO. If the measured rotational force T is the same or the rotational force T is large, the process proceeds to S7, and if small, the process proceeds to S9.

S7 to S8: The opening control amount δG (t) = K5 (T-TO) of the bait gate 8 is calculated from the measured rotational force T and the reference rotational force TO soften the excessively hardened soil. The top gate 8 is opened to the opening degree G (t) for obtaining (TO).

S9 to S10: In order to harden the soil softened excessively, the top gate 8 is completely closed for a predetermined time, and when the measured rotational power T is equal to the reference rotational power TO or the rotational force T becomes large, the process proceeds to S7. If it does not increase, go to S11.

S11 to S12: The screw conveyor 7 is rotated forward and backward at regular time intervals in a state where the top gate 8 is closed in order to harden the earth and sand, thereby increasing the supply amount of the refining aid or the screw conveyor 7 The rotation speed is increased or such operations are performed in combination. As a result, the measured rotational power T is equal to the reference rotational power TO or the rotational force T is large and the process proceeds to S7. If the rotational force T does not increase even after such an operation, it is determined that the improvement is impossible and the improved operation and Stop all excavation work.

According to the soil improvement control apparatus of the seal excavator of the present invention having the first feature, since the injection amount of the improved chemical is controlled according to the amount of soil discharged from the screw conveyor, an appropriate amount of the improved chemical necessary for the improvement of the excavated soil is added. As a result, the soil quality is improved to an optimal state, and a slump value below a certain value is always maintained, and the ejection of the soil by groundwater and the storage of soil by the soil more than necessary are prevented. This amount of soil can be determined from the excavation speed of the seal excavator, calculated from the rotation speed of the screw conveyor, or from the excavation speed of the seal excavator and the rotation speed of the screw conveyor described above.

Moreover, according to the soil improvement control apparatus of the shield excavator of this invention which has a 2nd characteristic, since the rotational force for rotating a screw conveyor is measured, the improvement degree of soil quality can be grasped | ascertained over time, and the soil improvement Depending on the degree, the soil may be finely adjusted over time, so that the desired soil is maintained. Operation by the recovery means for increasing the rotational force is to adjust the opening degree of the gate for discharging the soil, to increase the injection amount of the improved medicine, to close the top gate and increase the screw speed of the screw conveyor, Repeat the forward and reverse rotation of the screw of the screw conveyor. When the rotational force does not recover even if the operation for recovery is performed to some extent, a stop device for stopping all operations of the shield excavator and the soil improvement control device is provided, thereby providing a practical and high safety device.

Claims (3)

In the seal excavator which excavated by the cutter head installed in the front part and carried out inside the chamber by the screw conveyor, the soil is discharged from the inside of the chamber by the screw conveyor and discharged through the top gate from the screw conveyor. Medicine injection means for injecting the improved medicine into the soil for improvement, the rotational force detecting means for detecting the rotational force T of the screw conveyor 7, and the rotational force T detected by the rotational force detecting means Soil in the seal excavator, characterized in that it is provided with a recovery means for restoring the properties of the earth and sand when the rotational force (T) recovers up to the reference rotational force (TO) when it is smaller than the reference rotational force (TO) corresponding to the desired soil. Improved control system. The method of claim 1, wherein the recovery means is to reduce or close the opening degree of the top gate (8), to repeat the forward and reverse rotation of the screw of the screw conveyor (7), The soil quality in the seal excavator characterized by increasing the injection amount of the improved chemical | medical agent injected in order to improve, or performing any one or more operations of raising the screw rotation speed of the said screw conveyor 7 above. Improved control system. The shielded excavator according to claim 1 or 2, wherein when it is detected by the rotational force detecting means that the rotational force T does not reach the reference rotational force TO after the operation by the recovery means. (1) and a soil improvement control device in a seal excavator, characterized in that it comprises stop means for stopping all operations of the soil improvement control device.