JPH03158596A - Ground excavating method by shield machine and device thereof - Google Patents

Abstract

PURPOSE:To improve the extent of excavating performance by pouring a mud grain cross linking agent in the natural ground to be excavated in advance, and excavating the ground as nodulizing the mud high in earth grading properties. CONSTITUTION:A cutter face plate 3 is installed in front of a cylindrical shield frame 1 free of rotation, and a cutter chamber 4 is installed in the backside in this frame 1. In addition, there are provided with a tank 9, which stores a mud grain cross linking agent 7 in a mud grain cross linking agent injecting means 8, and a pump 10 for pouring it into a face ground 2, and they are connected on line via a solid sensor 13 and a central processing unit CPU 14 in the cutter chamber, and height of stickiness is detected by fluidity and water content in earth and sand. Then, the cross linking agent 7 pressurized by the pump 10 is sprayed and poured toward a natural ground 2 through the inside of the cutter chamber 4 and a passage 11. With this constitution, the natural ground is reformed into a crumbly soil so that excavating performance is improvable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for excavating a ground using a shield excavator and an apparatus thereof, and in particular, the present invention relates to a method for excavating a ground using a shield excavator and an apparatus therefor. The present invention relates to a method and device for excavating earth using a shield excavator, which can improve excavability in some cases.

[Prior Art] A shield excavator used for tunnel excavation has a cutter face plate which is rotatably provided on the front side of a cylindrical shield frame for substantially excavating the face ground, and is located on the back side of the cutter face plate. A cutter chamber for storing the excavated earth and sand is formed in the shield frame, and a screw conveyor for discharging the earth and sand from the cutter chamber is connected to this cutter chamber. The tunnel is constructed horizontally by taking the cutter into the cutter chamber and extending the segments into a hole formed behind the shield frame.

When such a shield excavator excavates a face ground with a highly sticky mud component, the sticky mud adheres to the cutter face plate, significantly reducing excavation performance. The mud adheres to and fills the cutter chamber, increasing the cutter torque load for rotating the cutter face plate.

As a countermeasure against this problem, a water injection method is known in which a large amount of water is injected from the cutter face plate toward the face ground to wash away the sticky mud from the cutter face plate and the cutter chamber.

Another known countermeasure is to use pressurized air to inject high-pressure air from the cutter face plate toward the face ground to wash away the moisture in the sticky mud, making the face ground dry and easy to excavate. ing.

[Problems to be Solved by the Invention] In the water injection countermeasure described above, by injecting a large amount of water into the sticky mud of the face ground, the excavated soil becomes highly fluid muddy soil. This results in the problem of post-treatment of this muddy soil.

In other words, highly fluid muddy soil cannot be used as embankment for landfills or housing development sites, etc.
Various methods and equipment must be used to reform the soil into the usual crumbly soil, which increases the cost for post-treatment of the discharged soil.

On the other hand, with the measures using pressurized air, some of the large amount of high-pressure air injected into the sticky mud of the rock face may leak from wells built around the rock, creating an environment that is harmful to local residents. There is a risk of causing problems.

The purpose of the present invention, which was created to solve the above problems, is to
A shield excavator capable of improving excavation performance by reforming the mud into crumbly soil when the earth and sand excavated from the face ground is highly sticky mud, and preventing the mud from adhering to the cutter face plate. The present invention provides a method and device for excavating a rock by the method and apparatus thereof.

[Means for Solving the Problems] In order to achieve the above object, a method for excavating a ground using a shield excavator according to the first invention of the present invention provides a method for excavating a ground by using a shield excavator. When the soil is highly sticky mud, a mud particle cross-linking agent is injected into the ground to be excavated in advance, and the highly sticky mud to be excavated is aggregated with the mud particle cross-linking agent while excavating. This is what I did.

In addition, the earth excavation device using the shield excavator according to the second invention of the present invention includes mud particles that inject a mud particle cross-linking agent toward the earth to be excavated from the cutter face plate portion that excavates the earth. It is comprised of a crosslinking agent injection means.

[Function] In the method for excavating a ground using the shield excavator, which is the first invention, when the excavated earth and sand is highly sticky mud, that is, the ground to be excavated is highly sticky. When the soil is muddy, a mud particle crosslinking agent is injected into the ground in advance.

Then, the ground consisting of highly sticky mud is modified into crumbly soil because the mud particles are crosslinked with each other and aggregated by the mud particle crosslinking agent.

In other words, highly sticky mud with poor excavability is reformed into crumbly soil with good excavability.

In the excavation device using the shield excavator, which is the second invention, the mud particle cross-linking agent is injected from the cutter face plate toward the ground to be excavated by the mud particle cross-linking agent injection means.

Then, the mud particle crosslinking agent and the excavated earth and sand are stirred by the rotation of the cutter face plate. At this time, even if the ground to be excavated is a highly sticky muddy soil with poor excavability, the mud particles of the ground are cross-linked with each other by the mud particle cross-linking agent and aggregated, resulting in poor excavability. The soil quality is improved to be high and crumbly.

Therefore, highly sticky mud will not adhere to the load face plate and reduce excavation performance.

[Embodiment] An embodiment of a rock excavation device according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a cutter face plate 3 for substantially excavating a face ground 2 is rotatably provided on the front surface of a cylindrical shield frame 1, and the cutter face plate 3 takes in excavated earth and sand. A cutter chamber 4 for this purpose is located on the back side of the cutter face plate 3 and is provided within the shield frame 1.

This cutter chamber 4 includes a screw conveyor 5 for discharging the excavated earth and sand contained in the cutter chamber 4 to the outside of the cutter chamber 4.
A belt conveyor 6 is provided at the discharge end of the screw conveyor 5 to convey the excavated soil to the outside of the mine.

A mud particle crosslinking agent injection means 8 for injecting a mud particle crosslinking agent 7 into the face ground 2 to be excavated is provided on the back side of the cutter face plate 3 and the cutter chamber 4. This mud particle cross-linking agent 7 cross-links the mud particles of highly sticky mud to each other and aggregates them.

As shown in FIG. 1, the mud particle cross-linking agent injection means 8 includes a tank for storing the mud particle cross-linking agent 7 and a cylinder for injecting the mud particle cross-linking agent 7 in the tank 9 into the face ground 2. 110, this pump 10
The pressurized mud particle cross-linking agent 7 passes through the mud particle cross-linking agent passage 11 formed in the cutter chamber 4 and the force face plate 3.
The fuel is then injected towards the face rock 2.

The mud particle bridging material passage #t11 communicates with the shaft internal passage formed in the shaft core of the cutter face plate rotating shaft 12 provided in the cutter chamber 4 to rotate the cutter face plate 3. The cutter face plate passage is formed in the cutter face plate 3.

A plurality of passage outlet portions of the internal passages of the cutter face plate are provided at the center and end portions of the cutter face plate 3 facing the face ground pile 2, respectively.

In addition, as shown in FIG.
Soil sensor 13 and CPU 14 attached to the canter chamber 4
The system is connected online through the cutter chamber, and operates according to the quality of the excavated soil taken into the cutter chamber. That is, when the soil sensor 13 finds that the excavated soil in the cutter chamber 4 is highly sticky mud that is difficult to excavate, the CPU 14 sends an activation command to the pump 10, and the pump 10 The mud particle crosslinking agent 7 in 9 is injected toward the face ground 2. The soil sensor 13 detects the fluidity and moisture content of the excavated soil in the cutter chamber 4, and detects from these detected values whether the soil is highly sticky mud.

Further, in this embodiment, the mud particle crosslinking agent 17 uses a natural water-soluble polymer material extracted from natural protein such as konjac.

The mud particle bridging material 7 is not limited to the above-mentioned materials, but any material having an aggregate function, whether natural or synthetic, can be used, and it can be used alone or in combination with a rear shelf to achieve its purpose. Moreover, it goes without saying that the mud particle crosslinking agent 7 may be in the form of powder or liquid.

The method of the present invention will be described based on a specific example of the apparatus having the above configuration.

As shown in FIG. 1, when the soil sensor 13 installed in the cutter chamber 4 determines that the excavated soil taken into the cutter chamber 4 is highly sticky mud, the 2 is a highly sticky muddy soil that is difficult to excavate, the CPt connected online with the soil quality sensor 13 is
J14 transmits an operation command to the pump 10, and the pump 10 operates to inject the mud particle crosslinking agent 7 in the tank 9 toward the face ground 2. Then, the mud particle cross-linking agent 7 passes through the mud particle cross-linking agent passages 11 formed in the cutter chamber 4 and the cutter face plate 3, and passes through a plurality of passages formed at the center and end portions of the cutter face plate 3. The water is injected from the outlet toward the face ground 2.

In this way, the mud particle crosslinking agent 7 injected into the face ground 2 is mixed with the excavated earth and sand by the rotation of the cutter face plate 3.

As a result, the face ground mountain 2 made of highly sticky mud that is difficult to excavate is modified into a crumbly soil that is easy to excavate because the mud particles are cross-linked with each other and aggregated by the mud particle cross-linking agent 7. be done.

Therefore, the highly sticky mud does not adhere to the cutter face plate 3 and the excavation performance deteriorates, and the mud adheres to and fills the cutter chamber 4, increasing the cutter torque load for rotating the cutter face plate 3. I won't end up doing it.

In this way, by injecting the mud particle cross-linking agent 7 by the mud particle cross-linking agent adding means 8 into the face ground 2 made of highly sticky mud with poor excavability, the mud is made into crumbly soil with good excavability. It can improve the soil quality and improve excavation performance.

At this time, the mud particle crosslinking agent 7 crosslinks the mud particles of the highly sticky mud and aggregates them to modify the soil quality, so it does not change the pH of the mud.

Therefore, it is possible to use the excavated soil, which has been modified to crumbly soil, as embankment or backfill material for reclaimed land, residential development land, etc., without incurring soil contamination problems caused by pH changes.

In addition, the excavated soil that has been modified to have a crumbly soil quality is very easy to collect, and the cost for discharging the excavated soil can be reduced.

Further, since the present invention improves the soil quality of the face ground in this way, it goes without saying that the problem of air leakage from wells around the ground that occurs when conventional pressurized air is used does not occur.

In this embodiment, the soil sensor 13 provided in the cutter chamber 4 is configured to detect whether the face ground 2 is highly sticky mud, but the present invention is not limited to this. For example, it may be configured such that when the cutter torque load exceeds a predetermined load, it is determined that the face ground 2 is highly sticky mud. The determination may be made by directly visualizing.

[Effects of the Invention] As explained above, according to the present invention, the following excellent effects are exhibited.

(1) When the ground to be excavated is highly sticky mud with poor excavability, by injecting a mud particle crosslinking agent into the ground, the ground is reformed into a crumbly soil that is easy to excavate. This improves drilling performance.

(2) Therefore, it is possible to prevent the mud from adhering to the cutter face plate.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a rock excavation device using a shield excavator, showing an embodiment of the present invention. In the figure, 2 is a ground, 3 is a cutter face plate, 7 is a mud particle crosslinking agent, and 8 is a mud particle crosslinking agent injection means.

Claims (1)

[Scope of Claims] 1. When excavating a ground with a shield excavator, when the excavated earth and sand is highly sticky mud, a mud particle cross-linking agent is injected into the ground to be excavated in advance, A method for excavating earth using a shield excavator, characterized in that highly sticky mud to be excavated is aggregated with the mud particle cross-linking agent as described above. 2. Earth excavation by a shield excavator characterized by being equipped with a mud particle cross-linking agent injection means for injecting a mud particle cross-linking agent toward the excavated earth from the cutter face plate portion that substantially excavates the earth. Device.