JPH09317389A - Excavated-material improving device for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent clogging even by mud-shaped excavated materials, in which gravel, etc., are mixed, to maintain the mixing capacity of excavated materials and a modifier for a prolonged term and to adjust the degree of mixing. SOLUTION: This improving device has an excavated-material charging port 3 with a modifier filler hole 3a, into which excavated materials excavated by a shield machine are charged and a modifier improving the quality of excavated materials is injected. A non-shaft inlet-side ribbon screw 5 is installed internally to the excavated-material charging port 3 of a straight cylindrical casing 2 having an improved-soil discharge opening 4 on the rear end side, a non-shaft outlet-side ribbon screw 6 is mounted internally on the improved-soil discharge opening 4 side, and an excavated-material agitating mechanism 7, in which agitating blades 7c are projected from an inner circumference, is set up between these inlet-outlet side ribbon screws 5, 6. An improved-soil discharge gate 8, in which an opening is adjusted in response to the revolving-torque corresponding value of the outlet-side ribbon screw 6, is installed between the outlet-side ribbon screw 6 and the improved-soil discharge opening 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavated soil improvement device for a shield machine, and more particularly, to an excavated soil improvement method for a shield machine that improves excavation soil excavated by an earth pressure type shield machine to a property that is easy to handle. It belongs to the technical field of devices.

[0002]

2. Description of the Related Art In recent years, a shield excavator has been used to excavate a geological ground having a high groundwater level without utilizing an auxiliary construction method such as injection of a modifier. By the way, excavated soil with high fluidity discharged by the excavation of the shield machine is classified as industrial waste, so that the disposal site is limited. Moreover, since it is difficult to transport excavated soil with a normal dump truck, a transporting means having a special structure such as a tank truck is required, and the transport cost is high. So, in the starting shaft work base,
Alternatively, the excavated soil improvement treatment plant installed in the vertical shaft was used to mix the excavated soil with lime and cement to improve the soil so that the soil is easy to handle. However, installation of such an excavated soil improvement treatment plant requires a vast space, and a dedicated worker is required for operation and management of the plant.

Normally, highly fluid excavated soil excavated by a shield machine is carried out to the outside of a mine by carrying-out machine equipment such as a belt conveyor or zloty truck. However, there has been a problem to be solved in that post-treatment for collecting scattered scattered excavated soil and cleaning the inside of the mine must be performed, and extra labor and time must be spent for the post-treatment. Further, there is also a problem to be solved in the operation of the mechanical equipment such that the ordinary mechanical equipment for carrying out the residual soil cannot be used when the excavated soil is in a slurry form.

Therefore, a shield excavator for improving excavated soil having a high fluidity is provided in the shield machine, and the excavated soil discharged from the screw conveyor along with the excavation is improved in the shield machine. Things are getting done. Such excavated soil improving apparatus is disclosed, for example, in Japanese Patent Publication No. 62-318 (conventional example 1), Japanese Patent Application Laid-Open No. 3-158599 (conventional example 2), and Japanese Patent Application Laid-Open No.
311990 (conventional example 3), JP-A-6-1000.
As disclosed in Japanese Patent Publication No. 58 (Prior Art 4), etc., the outline of these excavated soil improvement devices will be described below.

FIG. 3 is a vertical cross-sectional view of the soil excavation improvement device (excavation soil improvement device) of the shield machine according to Conventional Example 1 described above.
Referring to (a) and FIG. 3 (b) which is a cross-sectional view of the continuous mixer section, the pressure chamber 3 of the shield machine will be described.
A cylindrical casing 2 having an opening on the front side on the side of the partition 1 and a closed rear end is attached to the partition 1. Inside the casing 2, on the partition wall 1 side, a screw conveyor 4 which is rotated via a shaft 7 which is rotated by a drive motor 8 on the rear end side of the casing 2 is provided. Further, the rear end side of the casing 2 of the shaft 7 is externally mounted on the shaft 7, and the rear end of the casing 2 and the drive motor 8 are provided.
A continuous mixer 5 including a hollow mixer shaft 6 that is rotated by a drive motor 9 provided between the mixer and a plurality of stirring blades 12 that project from the outer periphery of the mixer shaft 6 is provided. . Further, an earth discharging gate 10 is provided below the rear end side of the casing 2 and the casing 2
An injection port 11 for injecting a modifying agent for solidifying the soil is provided at a position corresponding to the upper side of the and between the screw conveyor 4 and the continuous mixer 5.

FIG. 4 (a) of the schematic structure explanatory view of the soil discharge processing device (excavation soil improving device) of the shield machine according to the above-mentioned conventional example 2 and an enlarged side sectional view of the soil discharge stirring transfer conveyor. 4 (b) and FIG. 4 of the AA line arrow view of FIG. 4 (b).
Describing with reference to (c), the screw conveyor 5 is discharged to the discharge end side of the screw conveyor 5 that discharges discharged soil, which is excavated earth and sand taken into the cutter chamber 4 on the front side of the shield frame 1. An earth-discharging and agitating conveyor 6 is provided for agitating the soil-like earth-discharging soil and transporting it outside the system. This soil discharge stirring transfer conveyor 6 is shown in FIG.
As shown in, it is a ribbon type screw conveyor. More specifically, as shown in FIG. 4 (b), it comprises a cylindrical conveyor tube 7 forming the outer contour of the conveyor 6 and a flight 8 spirally formed along the inner peripheral surface of the conveyor tube 7. It is composed of a ribbon type screw, and by rotating the flight 8 with a motor 9, the mud-like soil 10 is conveyed to the outside of the system while being stirred. In addition, in order to improve the agitating property of the mud-like soil discharging conveyor 10,
Gate 12 that opens and closes the outlet 11 of the screw conveyor 5
About half of the conveyor pipe 7 is filled with mud-like soil through the pipe. Further, the soil discharge stirring transfer conveyor 6 is provided with a mud particle cross-linking agent adding means 14 for adding the mud particle cross-linking agent 13 to the mud soil discharge 10. The mud particle cross-linking agent adding means 14 is connected to the CPU 15 online so that the addition amount of the mud particle cross-linking agent 13 can be adjusted in accordance with the excavation speed of the shield machine.

Explaining the excavated soil improving apparatus for a shield machine according to Conventional Example 3 above with reference to FIG. 5 which is a sectional view showing the excavated soil improving apparatus behind the shield machine, the screw conveyor on the front side of the shield machine will be described. The excavated soil improvement device 100 is connected to the slip discharge port 7 of 6. The excavated soil improving apparatus 100 has a cylindrical end 8 connected to the slip discharge port 7 and arranged rearward in the shield pit 45, and rotates along an axis of a central portion of the casing 8. A stirring blade shaft 10 that is freely installed and this stirring blade shaft 1
And a means 11 for rotationally driving 0. The stirring blade 1 of the stirring blade shaft 10 extends along the inner peripheral surface of the casing 8.
It is provided with a rotatable ribbon screw 13 having a spiral shape having a diameter that does not interfere with 2, and a means 14 for rotationally driving the ribbon screw 13. The casing 8 is provided with a plurality of improving material injection holes 15 for injecting an improving material, which is a modifying agent, at a plurality of axial positions, and an outlet 9 for the improved soil. It should be noted that what is attached to the entire surface and the back surface of the ribbon screw 13 are the stirring pieces 40 and 40 ', which are ribbon screw 13
It works to agitate the excavated soil sent by.

The shield machine used in the shield method according to the conventional example 4 will be described with reference to FIG. 6 which is a sectional view of the shield machine. The shield machine 1 has improved fluidity and viscosity more than the front cutter head 2. A so-called excavated soil improvement device that takes in excavated soil excavated while discharging a material from the mixing chamber 1b, adds a modifier to the taken excavated soil and mixes them to improve the soil quality of the excavated soil and discharge it. Is provided. The screw conveyor 3 is located above the first conveying screw 3 ₁ and the second conveying screw 3 ₂ and the shutter 14 which are arranged in a straight line via the shutter 14, and for the first and second conveying. It is composed of a mixing screw 3 ₃ which communicates between the screws 3 ₁ and 3 ₂ . 1st transport screw 3 ₁
Is housed in a cylindrical case 3a having a tip opening in the mixing chamber 1b, and a hole communicating with the mud improvement aid injection pipe 5 is provided at the upper part of the case 3a behind the partition wall 1a. . Therefore, when the shutter 14 is closed, the excavated soil in which the mud improvement aid is injected flows toward the mixing screw 3 _{3 and} is mixed, so that the soil quality is improved. The improved soil is then transferred to the shutter 1 on the rear end side of the screw conveyor 3 by the second conveying screw 3 ₂ .
It is conveyed in the direction of 2 and discharged from the hopper 13. When the screw conveyor is a ribbon screw, the degree of mixing is adjusted by appropriately changing the position of the auxiliary agent injection hole, and in the case of a screw with a shaft, an auxiliary mixing screw may be provided. Further, the injection amount of the mud improvement aid is controlled by the rotation speed of the screw or the measured amount of discharged soil.

[0009]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The soil excavation improvement device, soil excretion processing device or excavated soil improvement device (hereinafter referred to as excavated soil improvement device) of a shield machine according to the above-mentioned conventional examples 1, 2, or 3 is accordingly provided. Although useful, each has problems to be solved as described below.

The continuous mixer of the excavated soil improving apparatus according to the above-mentioned conventional example 1 is provided with a mixer shaft or a projecting installation on the mixer shaft.
The internal space is narrowed by the stirring blade support rod with the stirring blade attached to the tip, and when the gravel is mixed in the highly fluid mud excavated soil, it tends to be clogged, and it responds to changes in the excavated soil. Not only is it difficult, but because the mixer shaft is externally fitted to the shaft, a seal must be provided to prevent excavated soil from entering between the mixer shaft and the shaft, which complicates the configuration of that part. As a result, there is a problem to be solved, which is disadvantageous in terms of equipment cost.

Since the excavated soil improving apparatus according to the conventional example 2 is configured to stir the excavated soil only with the ribbon type screw,
There is a problem to be solved that a sufficient stirring effect cannot be obtained.

The excavated soil improving apparatus according to the conventional example 3 is expected to have an effect of stirring the excavated soil and the modifying agent by the ribbon screw. However, since a sufficient stirring effect cannot be expected with the ribbon screw alone, the stirring capacity is improved by attaching a stirring piece to the ribbon screw as described above, so the internal space of the excavated soil improvement device is narrowed. However, there is a problem to be solved that if mud-like excavated soil with high fluidity is mixed with gravel, it tends to be clogged. Also,
Since the stirrer piece cannot be made large due to the structure, there is a problem that the stirrer ability is deteriorated due to abrasion and the initial stirring effect cannot be maintained for a long period of time.

In the excavated soil improving apparatus according to the above-mentioned conventional example 4, since the excavated soil conveyance route is forced to change its direction on the way, it is clogged when gravel is mixed in the highly fluid mud-like excavated soil. There is a problem to be solved that is easy. In addition, the rotation speed of the screw is the operation of the shield machine (maintaining the face mud pressure).
Since the adjustment of the degree of improvement of the excavated soil is dependent on the change of the position of the injection hole of the mud improvement agent, there is a problem to be solved that the degree of improvement of the excavated soil is difficult to adjust.

Therefore, according to the present invention, even if gravel or the like is mixed in the excavated soil, it is unlikely to be clogged, the mixing ability of the excavated soil and the modifier can be maintained for a long time, and the degree of mixing can be easily adjusted. The purpose of the present invention is to provide an excavated soil improvement device for a shield machine that can be used in a uniform manner.

[0015]

In order to solve the above-mentioned problems, the means adopted by the excavated soil improving apparatus for a shield machine according to claim 1 of the present invention inputs the excavated soil excavated by the shield machine. And has a modifying agent injection port provided with a modifying agent injection port for injecting a modifying agent that improves the property of the injected excavating soil to make it easier to handle. On the excavated soil input port side of a cylindrical casing having an improved soil discharge port for discharging the improved soil improved by mixing the excavated soil excavated and the modifier injected from the modifier injection port with the casing. A shaftless inlet-side ribbon screw that is rotated by a drive motor provided outside of the casing is installed inside, and a shaftless output that is rotated by another drive motor provided outside the casing is provided on the improved soil discharge port side. Inside the side ribbon screw, A cylindrical excavated soil stirring mechanism having a stirring blade projecting from the inner circumference of the casing, which is rotated by another drive motor provided outside the casing between the inlet ribbon screw and the outlet ribbon screw. It is characterized by the internal installation.

In order to solve the above problems, the means adopted by the excavated soil improving apparatus for a shield machine according to claim 2 of the present invention is the excavated soil improving apparatus for a shield machine according to claim 1. , The input side ribbon screw, the excavated soil stirring mechanism, a torque detecting means for detecting the rotational torque of at least one of the output side ribbon screw, and between the output side ribbon screw and the improved soil discharge port,
It is characterized in that an improved soil discharge gate whose opening is freely adjusted based on a torque signal from the torque detecting means is provided.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An excavated soil improving apparatus for a shield machine according to an embodiment of the present invention will now be described with reference to FIG. 1 which is a side view showing a main part of a casing in section and a drive / control system explanatory view thereof. 2 will be described with reference to FIG.

That is, reference numeral 1 is an excavated soil improving apparatus, which improves the highly fluid mud excavated soil excavated by a shield machine (not shown) so that it can be easily handled. On the side, there is an excavated soil input port 3 provided with a modifier injection port 3a into which excavated soil is injected, and a modifier for improving the property of the injected excavated soil to be easily handled is provided, Further, a straight cylinder having, on the side opposite to the excavated soil input port 3, an improved soil discharge port 4 for discharging the improved soil improved by mixing the injected excavated soil and the modifier injected from the modifier injection port 3a. The casing 2 is provided.

From the screw conveyor 20 to the excavated soil input port 3
The modifying agent is injected into the excavated soil to be injected into the above-mentioned manner from the modifier injection port 3a as described above, but the injection amount needs to be changed depending on the amount of the excavated soil to be injected. Therefore, the modifier control system 30 for controlling the injection amount of the modifier
As shown in FIG. 2, the modifier supply pipe 32 is connected to the modifier inlet 3a from the modifier supply pump 31a rotated by the variable speed motor 31b of the modifier supply device 31 which is controlled in variable speed. The modifier is supplied via the above. The rotation speed of the variable speed motor 31b is controlled by the modifier amount adjuster 34 to which the rotation speed signal of the screw driving motor 21 for driving the conveying screw 20a of the screw conveyor 20 output from the tachometer 33 is input. It is something.

On the excavated soil input port 3 side of the casing 2, there is provided a shaftless inward ribbon screw 5 which is rotated by an inward screw hydraulic motor M ₁ which is a drive motor provided outside the casing 2. It is installed internally. As described above, although the inlet ribbon screw 5 is rotated by the inlet screw hydraulic motor M ₁ , the inlet screw hydraulic motor M ₁ is rotated.
₁ and rotation pinion G ₁ comprising fitted on the output shaft of the inlet side screw hydraulic motor M _1, a ring gear 5a of the end surface in the radial direction of the inlet side ribbon screw 5 on the inner peripheral surface is fixed
It is configured to be transmitted by meshing with.

On the side of the improved soil discharge port 4 of the casing 2, a shaftless outlet ribbon screw which is rotated by an outlet screw hydraulic motor M ₂ which is another drive motor provided outside the casing 2. 6 is installed internally. This output side ribbon screw 6 is similar to the input side ribbon screw 5 in that the pinion G ₂ is fitted onto the output shaft of the output side hydraulic motor M _{2 and} the output side ribbon screw 6 is provided on the inner peripheral surface.
It is configured to rotate by meshing with the ring gear 6a to which the end surface in the radial direction is fixed.

Between the entrance side ribbon screw 5 and the exit side ribbon screw 6 is rotated by a stirring blade hydraulic motor M ₃ which is another drive motor provided outside the casing 2. The excavated soil stirring mechanism 7 having the configuration described later is provided. This excavated soil stirring mechanism 7
It includes a rotating circular cylinder 7b of the ring gear 7a pinion G ₃ consisting are fitted on the output shaft of the stirring blade for the hydraulic motor M ₃ is engaged is externally fitted, protruded from the inner peripheral surface of the rotating disk body 7b The rotary cylinder 7b is constituted by a plurality of stirring blades 7c protruding in the radial center direction.

Further, gate opening / closing cylinders 8a, 8a are provided between the delivery side ribbon screw 6 and the improved soil discharge port 4.
An improved soil discharge gate 8 is provided for adjusting the discharge amount of the improved soil by adjusting the opening degree with. The opening degree of the improved soil discharge gate 8 is the gate opening / closing cylinder 8a,
It is configured to be adjusted by a control valve that controls the operation of 8a and is controlled by the control means described later.

Next, the structure of the improvement device drive / control system of the excavated soil improvement device 1 will be described with reference to FIG. 2. The improvement device drive / control system 10 rotates the entrance side ribbon screw 5. Inlet side screw drive system 11 and outlet side screw drive system 12 for rotating the outlet side ribbon screw 6
And a stirring mechanism drive system 1 for driving the excavated soil stirring mechanism 7.
3 and a gate drive / control system 14 for controlling the opening / closing of the improved soil discharge gate 8. The details of the configuration of each system will be described below.

[0025] First, the entering-side screw drive system 11 includes an electric motor and a hydraulic pump 11b driven by 11a, tachometer R ₁ hydraulic motor entering-side screw rotational speed is measured by M ₁ from the hydraulic pump 11b And a flow rate control valve 11d is connected to the hydraulic pump 11b.
The hydraulic oil supply pipe 11c is provided with a pressure gauge 11e for measuring the discharge pressure and the ammeter 11f for measuring the drive current for driving the electric motor 11a.

The output side screw drive system 12 is an electric motor 1.
A hydraulic pump 12b driven by 2a, from the hydraulic pump 12b, communicates with the tachometer R ₂ hydraulic motor M ₂ for the delivery side screw speed is measured by the flow rate control valve 12
hydraulic oil supply pipe 12c including a pressure gauge 12e for measuring the discharge pressure of the hydraulic pump 12b.
And an ammeter 12f for measuring a drive current for driving the electric motor 12a.

The stirring mechanism drive system 13 is an electric motor 13a.
A hydraulic pump 13b driven by, from the hydraulic pump 13b, communicates with the tachometer R ₃ agitating blade hydraulic motor M ₃ which speed is measured at, together with the flow control valve 13d is interposed, the hydraulic pump The hydraulic oil supply pipe 13c is provided with a pressure gauge 13e for measuring the discharge pressure of 13b, and an ammeter 13f for measuring the drive current for driving the electric motor 13a.

As is well understood from the above description, the inlet side screw drive system 11 and the outlet side screw drive system 12 are provided.
The stirring mechanism drive system 13 and the stirring mechanism drive system 13 have exactly the same configuration, but the entrance side ribbon screw 5, the exit side ribbon screw 6, and the excavated soil stirring mechanism 7 can be individually rotated. As described above, the purpose of allowing the drive systems to be individually driven is to enhance the stirring effect of the excavated soil, and for example, the excavated soil stirring mechanism 7 is provided more than the inlet ribbon screw 5 and the outlet ribbon screw 6. By increasing the rotation speed, the effect of stirring excavated soil can be enhanced.

The gate drive / control system 14 includes the control valve 1
4d is interposed, and the rotational speeds of the hydraulic oil supply pipe 14c communicating with the gate opening / closing cylinder 8a from the hydraulic pump 14b driven by the electric motor 14a, and the outlet side hydraulic motor M ₂ of the outlet side screw drive system 12 are measured. The rotation speed signal from the tachometer R ₂ and the current signal from the ammeter 12f that measures the drive current of the electric motor 12a are input, and the drive torque of the delivery side ribbon screw 6 is based on these rotation speed signal and current signal. And a gate controller 15 for controlling the opening and closing of the improved soil discharge gate 8 by controlling the opening degree of the control valve 14d so that this value becomes a predetermined value. There is. As well understood from the above description, the torque detecting means is constituted by the combination of the tachometer R ₂ and the ammeter 12f.

The reason why the torque corresponding value is obtained by such a torque detecting means is that it has been found that the mixing degree of the excavated soil and the modifying agent can be known by the magnitude of the torque corresponding value. That is, by adjusting the torque-corresponding value by opening / closing the improved soil discharge gate 8, the mixing degree of the excavated soil and the modifying agent can be always maintained within a certain range, and, of course, the improved soil of the desired mixing degree can be obtained. Because you can get Incidentally, when the torque corresponding value is large, it means that the excavated soil is well agitated, and the improvement degree of the excavated soil is high.

The electric signal input to the gate controller 15 may be, for example, the pressure signal of the outlet screw hydraulic motor M ₂ of the outlet screw drive system 12 or the drive power signal of the electric motor 12a. May be In this embodiment, in order to control the opening and closing of the improved soil discharge gate 8, as described above, the exit side screw drive system 12 is used.
However, it is also possible to use signals from other drive systems, for example, the inlet side screw drive system 11 and the stirring mechanism drive system 13.

The operation mode of the excavated soil improving apparatus 1 having the above structure will be described below. First, the excavated soil excavated by a shield machine (not shown) is taken into the screw conveyor 20 and excavated by the excavated soil improving apparatus 1. It continues to be put into the soil input port 3. On the other hand, at the same time as the start of the introduction of the excavated soil into the excavated soil inlet 3, the modifier supply device 31 causes the modifier inlet 3
The number of revolutions of the conveying screw 20a of the screw conveyor 20, that is, the amount of the modifying agent according to the input amount of excavated soil is continuously injected into a. Then, the modifying agent and the excavated soil are agitated by the inlet side ribbon screw 5 which is continuously rotated by the inlet side screw hydraulic motor M ₁ driven by the operation of the inlet side screw drive system 11, while excavating the excavated soil. It is conveyed while flowing in the direction of the mechanism 7.

The mixture of the excavated soil and the modifier, which continue to flow into the excavated soil agitating mechanism 7, is rotated at a higher rotation speed than the inlet ribbon screw 5, and the agitating blade 7c of the excavating soil agitating mechanism 7 is rotated. Is stirred more uniformly. Then, the mixture is made to flow from the inside of the excavated soil stirring mechanism 7 toward the excavated soil discharge gate 8 while being further stirred by the rotation of the outlet ribbon screw 6, and the opening degree of the excavated soil discharge gate 8 is Since the drive torque of the outlet ribbon screw 6 is controlled by the controller 15 so as to fall within a predetermined range, it is possible to excavate the homogeneous improved soil in which the excavated soil and the modifier are mixed so as to have a predetermined mixing degree. The soil is discharged from the improved soil discharge port 4 in an amount according to the opening degree of the soil discharge gate 8.

In such an excavating soil improving apparatus 1 according to the embodiment of the present invention, in the improving step by stirring the excavating soil, as in the excavating soil improving apparatus according to the conventional example 1, the mixer shaft or the mixer shaft is provided. The inner space is not narrowed by the stirring blade support rod that is installed at the tip of the stirring blade and the stirring blade is attached to the tip, so even if gravel is mixed in the highly fluid mud excavated soil, it will be blocked. It is difficult and can easily respond to changes in excavated soil. Further, since the ribbon screw and the excavated soil agitating mechanism 7 are configured to agitate the excavated soil, unlike the excavated soil improving apparatus according to the second conventional example, the excavated soil is not agitated by the ribbon type screw alone, so that a sufficient agitation effect is obtained.

Further, unlike the excavated soil improving apparatus according to the conventional example 3, since the ribbon screw is not provided with the stirring piece, the inner space of the excavated soil improving apparatus is not narrowed and the mud having high fluidity is not provided. Even if gravel is mixed in the ground excavated soil, it is difficult to be clogged, and the initial stirring effect can be maintained for a long period of time. Since it has a straight cylindrical shape and does not change direction on the way, there is an effect that it is difficult to be clogged even when gravel is mixed in highly fluid mud-like excavated soil. Further, there is an effect that the degree of improvement of excavated soil can be easily adjusted by controlling the opening degree of the improved soil discharge gate 8.

[0036]

As described above, according to the excavated soil improving apparatus for a shield machine according to claim 1 or 2 of the present invention, as in the excavated soil improving apparatuses of Conventional Example 1 and Conventional Example 3, the internal space is improved. There is nothing to narrow down the flow path of excavated soil as in Conventional Example 4, and it is not a structure consisting of only a ribbon type screw as in Conventional Example 2 but a non-axial inlet side ribbon screw. A cylindrical excavated soil agitating mechanism having an agitating blade projecting from the inner periphery thereof and an axially-sided outlet ribbon screw are arranged in a straight line, and the shield according to claim 2 of the present invention. According to the excavated soil improving apparatus of the excavator, the degree of mixing of the excavated soil and the modifying agent can be freely adjusted by adjusting the opening degree of the improved soil discharging gate based on the torque signal from the torque detecting means. Therefore, it is possible to easily deal with changes in the properties of the excavated soil, that is, even excavated soil in which gravel or the like is mixed, and it is possible to easily adjust the degree of improvement of the excavated soil. Therefore, the improvement treatment efficiency of the excavated soil and the decrease in the improvement treatment efficiency of the excavated soil are reduced (the excavated soil improving device according to Conventional Example 3 does not have a stirring piece attached to the ribbon screw). It has a great effect on the ease of adjusting the degree of improvement of excavated soil.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a main part of a casing of an excavated soil improving apparatus for a shield machine according to an embodiment of the present invention.

FIG. 2 is a drive / control system explanatory diagram of the excavated soil improvement device of the shield machine according to the embodiment of the present invention.

FIG. 3 relates to a soil discharge improvement device (excavation soil improvement device) for a shield machine according to Conventional Example 1, FIG. 3 (a) is a vertical cross-sectional view thereof, and FIG. 3 (b) is a cross-sectional view of a continuous mixer section. Is.

FIG. 4 relates to a soil discharge processing device (excavation soil improving device) for a shield machine according to Conventional Example 2, FIG. 4 (a) is a schematic configuration explanatory view thereof, and FIG. 4 (b) is a soil discharge stirring transfer conveyor. FIG. 4C is an enlarged side cross-sectional view taken along the line AA of FIG. 4B.

FIG. 5 is a cross-sectional view of an excavated soil improving apparatus for a shield machine according to Conventional Example 3, showing an excavated soil improving apparatus behind a shield machine.

FIG. 6 is a cross-sectional view of a shield machine used in a shield construction method according to Conventional Example 4.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Excavation soil improvement device 2 ... Casing 3 ... Excavation soil input port, 3a ... Modifier injection port 4 ... Improved soil discharge port 5 ... Incoming ribbon screw, 5a ... Ring gear 6 ... Outgoing ribbon screw, 6a ... Ring gear 7 ... excavated soil stirring mechanism, 7a ... ring gear, 7b ... rotating circular cylinder, 7c ... stirring blade 8 ... modified soil discharge gate, 8a ... gating cylinder M ₁ ... inlet side hydraulic motor for screw, G ₁ ... pinion, R
₁ … Tachometer M ₂ … Hydraulic motor for outlet screw, G ₂ … Pinion, R
₂ ... tachometers M ₃ ... hydraulic motor stirring blade, G ₃ ... pinion, R ₃ ... revolution indicator 10 ... drive control system 11 ... inlet side screw driving system, 11a ... motor, 11b ...
Hydraulic pump, 11c ... Hydraulic oil supply pipe, 11d ... Flow control valve, 11e ... Pressure gauge, 11f ... Ammeter 12 ... Outgoing screw drive system, 12a ... Electric motor, 12b ...
Hydraulic pump, 12c ... Hydraulic oil supply pipe, 12d ... Flow control valve, 12e ... Pressure gauge, 12f ... Ammeter 13 ... Stirring mechanism drive system, 13a ... Electric motor, 13b ... Hydraulic pump, 13c ... Hydraulic oil supply pipe, 13d ... Flow control valve,
13e ... Pressure gauge, 13f ... Ammeter 14 ... Gate drive / control system, 14a ... Electric motor, 14b ...
Hydraulic pump, 14c ... hydraulic oil supply pipe, 14d ... control valve,
15 ... Gate controller 20 ... Screw conveyor, 20a ... Conveying screw 21 ... Screw drive motor 30 ... Modifier supply control system 31 ... Modifier supply device, 31a ... Modifier supply pump, 3
1b ... Variable speed motor, 32 ... Modifier supply pipe 33 ... Tachometer 34 ... Modifier amount adjuster

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuyuki Mino 1-13-40 Nishihonmachi, Nishi-ku, Osaka City, Osaka Prefecture Cornes House 4F Yamahiro Co., Ltd. Main office (72) Inventor Taizo Fukunaga Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo 1-3-18 Kobe Steel, Ltd. Kobe Head Office (72) Inventor Katsuhiko Yoshimoto 1-3-18 Wakihamacho, Chuo-ku, Kobe City, Hyogo Prefecture Kobe Steel Co., Ltd. Kobe Head Office

Claims (2)

[Claims] 1. Excavation soil provided with a modifier injection port into which excavated soil excavated by a shield machine is injected, and a modifier for improving the property of the injected excavated soil is improved. An improved soil discharge port that has an input port and discharges the improved soil improved by mixing the input excavated soil and the modifier injected from the modifier injection port on the side opposite to the excavated soil input port. On the excavated soil input port side of the cylindrical casing having,
A shaftless inboard ribbon screw which is rotated by a drive motor provided outside the casing is provided internally, and a shaftless shaft which is rotated by another drive motor provided outside the casing is provided on the improved soil discharge port side. The output side ribbon screw is installed inside, and between these input side ribbon screw and output side ribbon screw is rotated by another drive motor provided outside the casing, and a stirring blade is provided on the inner circumference. An excavated soil improvement device for a shield machine, comprising a cylindrical excavated soil stirring mechanism provided in a protruding manner. 2. A torque detecting means for detecting a rotational torque of at least one of the inlet side ribbon screw, the excavated soil stirring mechanism and the outlet side ribbon screw is provided, and the outlet side ribbon screw and the improved soil outlet are provided. The excavated soil improvement apparatus for a shield machine according to claim 1, further comprising an improved soil discharge gate whose opening is freely adjusted based on a torque signal from the torque detection means.