JPH0332622Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] This invention involves drilling a refill-type chemical injection pipe into the ground to a predetermined depth, injecting a chemical solution into the ground through the chemical injection pipe, and examining the soil quality of the ground. This invention relates to a shield tunneling machine that can be improved.

[Background of the idea]

When using the shield method, if it is necessary to improve the soil quality of the ground due to changes in the ground during excavation, the soil quality of the ground is usually improved by injecting a chemical solution from the ground. However, in situations on the ground, such as when there are houses on the ground or roads with heavy traffic, it may be difficult to perform chemical injection work from the ground.

Therefore, in recent years, shield tunneling machines have been equipped with chemical injection pipes, which are drilled into the ground to a predetermined depth (more than 10 meters), and the chemical solution is injected from inside the machine through the chemical injection pipe into the ground. , a method of improving the soil quality of the ground is increasingly being adopted.

Next, a conventional shield excavator employing this method will be explained with reference to FIGS. 4 to 6.
In the figure, 1 is a shield main body, which is provided with a bulkhead 2 that separates the face and the inside of the machine. 3 is a cutter wheel attached to the front side of the partition wall 2 of the shield body 1, and as shown in FIG. 6, it has a large number of cutters 4 and slits 5A and 5B for taking in dirt that face each other with the center of rotation of the cutter wheel as a boundary. have. 6 is a chamber formed between the cutter wheel 3 and the partition wall 2; 7 is a screw conveyor for discharging excavated soil; the soil in the chamber 6 is taken out from the lower part of the chamber 6 and discharged to the rear of the machine.
8 is a rotation axis of the cutter wheel, 9 is a drive device for the cutter wheel 3, 10 is a shield jack, 11
12 is a drill device provided inside the machine, and 12 is a guide tube for a drug injection pipe also provided inside the machine.
The distal end portion thereof penetrates the partition wall 2 and is fixed to the partition wall 2. Reference numeral 13 denotes a refillable chemical injection pipe, which is passed through the guide tube 12 in a state where the excavation operation is stopped when drilling into the ground, and its tip protrudes from the slit of the cutter wheel 3 toward the face side. By rotating and feeding the drill device 11, it is possible to drill a hole to a predetermined depth in the earth. Further, the drug solution is fed to the drug injection tube 13 from the proximal end of the drug injection tube 13.

The above-mentioned shield excavator excavates the face by rotating the cutter wheel 3, and the excavated earth and sand is delivered to the chamber 6 through the slits 5A and 5B of the cutter wheel 3.
By taking in the earth and sand and filling the chamber 6, an earth pressure opposite to the earth pressure of the face is generated, and the earth and sand inside the chamber 6 is discharged to the rear of the machine by the screw conveyor 7 while excavation is carried out. go. If it becomes necessary to improve the soil quality of the ground due to changes in the ground during this excavation, the excavation operation is stopped and the chemical injection pipe 13 is inserted into the guide tube 1 as shown in FIG.
2 and connected to a drill device 11, and the drill device 11 rotates and feeds the drug injection pipe 13 to drill into the ground. And medicine injection pipe 1
3 reaches a predetermined depth, the chemical injection tube 13 is disconnected from the drill device 11, and the chemical solution is poured into the chemical injection tube 1.
It is fed from the base end of No. 3 and injected into the ground to improve the soil quality of the ground.

By the way, in the conventional shield tunneling machine,
Since the guide tube 12 that guides the chemical injection pipe 13 is fixedly attached to the partition wall 2, the drilling direction of the chemical injection pipe 13 into the ground is limited to one direction, that is, the range of chemical injection is limited. This makes it difficult to improve soil quality over a wide area. For this reason, conventionally, a plurality of guide tubes are attached at different angles to widen the chemical injection range, but this causes the structure inside the machine to become complicated. Especially when the diameter of the shield body 1 is small,
It may be difficult to secure the installation space for the guide tubes, and it may be impossible to install the required number of guide tubes. In addition, when drilling the drug injection pipe 13,
Since the chemical injection tube 13 is passed through a slit in the cutter wheel 3, it is necessary to match the phase between the guide tube 12 and the slit when stopping the cutter wheel 3, and the cutter wheel 3 is required to have a high degree of stopping position accuracy. .

[Purpose of invention]

The purpose of this invention is to make the guide tube for the chemical injection pipe swingable, so that the range of chemical injection into the ground can be expanded with a single guide tube, and the purpose of this invention is to create a shield excavator that does not require a high degree of stopping position accuracy on the cutter wheel. Our goal is to provide the following.

[Summary of the idea]

The present invention includes a shield main body in which the face side and the inside of the machine are separated by a partition wall, a cutter wheel attached to the front side of the partition wall of the shield main body, and a guide tube for a chemical injection pipe installed through the partition wall, While the excavation operation is stopped, a refill-type chemical injection pipe is passed from inside the machine into the guide cylinder, and its tip is protruded from the gap between the cutter wheels toward the face side, and the chemical injection is carried out by a drill device installed inside the machine. In a shield excavator that can improve the soil quality of the ground by rotating and feeding the injection pipe to make it drill into the ground to a predetermined depth and injecting a chemical solution into the ground through the injection pipe, the A through hole having a diameter larger than the outer diameter of the guide tube is provided, the guide tube is fitted into the through hole, and the guide tube is swingable between the outer circumferential surface of the guide tube and the inner circumferential surface of the through hole. a swinging mechanism supported by the partition wall, and a flexible shielding plate is attached to the face side of the partition wall to isolate the swinging mechanism from the face side, so that the drilling direction of the drug injection pipe can be changed, The range of chemical injection into the ground can be expanded with a single guide tube, and the cutter wheel does not require a high degree of stopping position accuracy.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal cross-sectional view of the shield tunneling machine according to the present invention, showing a state in which a chemical injection pipe is drilled into the ground. FIG. 2 is a longitudinal sectional view showing the shield tunneling machine in an excavating state, and FIG. 3 is a side view, partially in section, showing the swinging mechanism of the guide tube in FIG. In FIGS. 1 and 2, the same reference numerals as those in FIGS. 4 and 5 indicate the same or equivalent components, and therefore the description thereof will be omitted. Although a plurality of guide tubes 12 are required for the required chemical injection range, in this description, one guide tube is used. This shield tunneling machine has one guide tube 22 that guides the chemical injection pipe 13.
This shield is provided inside the machine. On the other hand, a through hole 23 having a diameter larger than the outer diameter of the tip of the guide tube 22 is bored in the partition wall 2 . The tip of the guide tube 22 is fitted into the through hole 23, and a neck that swingably supports the guide tube 22 is provided between the outer circumferential surface of the tip of the guide tube 22 and the inner circumferential surface of the through hole 23. A swinging mechanism 24 is provided.

The swinging mechanism 24 is composed of a spherical bearing as shown in FIG.
5 is externally fitted onto the tip of the guide tube 22, and an outer race 26 is internally fitted into a cylindrical housing 27 which is fitted into the through hole 23. The inner race 25 has a protrusion 2 protruding from the outer peripheral surface of the guide tube 22.
8. Further, the outer race 26 is fixed by a projection 29 projecting from the inner peripheral surface of the housing 27 and a stopper 31 attached to the housing 27 with a bolt 30. On the other hand, a shielding plate 32 is provided on the chamber 6 side of the partition wall 2 to isolate the swing mechanism 24 from the chamber 6. This shielding plate 32 is made of a flexible material and is formed into an annular shape having an inner diameter substantially equal to the inner diameter of the tip of the guide tube 22 . The outer peripheral side of the shielding plate 32 is tightly attached to the end surface of the housing 27 via an annular restraining plate 33 and bolts 34 for attaching the restraining plate 33, and the inner peripheral side is attached to the end face of the guide tube 22.
An annular holding plate 35 is attached in close contact with the holding plate 35 via bolts 36 for attaching the holding plate 35. As a result, the shielding plate 32 isolates the swinging mechanism 24 from the chamber 6 and prevents earth and sand in the chamber 6 from entering the swinging mechanism 24.
It is designed to be able to flexibly follow the swing of the robot. Further, in order to better follow the swing of the guide tube 22, a deformed portion 32a is formed in the center of the cross section of the shielding plate 32. 18
shows a grease nipple that injects grease into the spherical bearing that constitutes the swing mechanism 24. The base end of the guide tube 22 is closed by a valve (not shown) during the digging operation to prevent earth and sand in the chamber 6 from leaking out from the guide tube 22 into the machine.

Next, the operation of this embodiment will be explained.

If it becomes necessary to improve the soil quality of the ground due to changes in the ground during excavation, stop the excavation operation, and
As shown by the solid line in FIG. 1, a chemical injection pipe 13 is drilled toward a target point A in the ground, and a chemical solution is injected through the chemical injection pipe 13. Next, the direction (angle) of the guide tube 22 is changed so that the tip of the chemical injection pipe 13 is directed toward the target point B in the earth, and the position of the drill device 11 is also changed. In this case, since the drug injection tube 13 is drilled up to a distance of more than ten meters, the position of the tip of the drug injection tube 13 can be greatly changed just by slightly changing the angle of the guide tube 22. Thereafter, by passing the chemical injection pipe 13 into the guide tube 22 and rotating and feeding it with the drill device 11, the chemical injection pipe 13 is drilled toward the target point B in the ground as shown by the two-dot chain line. , the drug solution is injected from the tip of the drug injection tube 13. By changing the oscillation angle of the guide tube 22 in this way, the drilling direction of the drug injection pipe 13 can be changed, that is, the target point of drug injection can be changed.

Therefore, in this embodiment, one guide tube 2
2 alone can expand the range of chemical injection into the ground, making it possible to simplify the internal structure of the machine.

Further, when the cutter wheel 3 is stopped to perform the above-mentioned chemical injection, even if the phase of the slit of the cutter wheel 3 and the guide tube 22 is slightly shifted, the guide tube 22
Since the guide tube 22 and the slit can be aligned in phase by swinging the cutter wheel 2, the cutter wheel 3 is not required to have a high degree of stopping position accuracy.

In this embodiment, an example was shown in which the swinging mechanism 24 of the guide tube 22 was configured with a spherical bearing, but the present invention is not limited to this.

[Effect of idea]

As explained above, according to the present invention, the range of chemical injection into the ground can be expanded with a single guide tube, so the structure inside the shield machine can be simplified, and the cutter wheel has an advanced stop. Positional accuracy is not required.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, Figure 1 is a vertical cross-sectional view of the shield excavator with the chemical injection pipe drilled into the ground, and Figure 2 is a vertical cross-sectional view of the shield machine in the digging state. Figure 3 is a side view, partially in section, of the swinging mechanism of the guide tube in Figure 2, and Figure 4 is a longitudinal cross-section showing a conventional shield excavator with a chemical injection pipe drilled into the ground. A top view, FIG. 5 is a vertical sectional view showing the state of excavation, and FIG. 6 is a front view of the cutter wheel. DESCRIPTION OF SYMBOLS 1...Shield body, 2...Partition wall, 3...Cut wheel, 11...Drill device, 13...Medicine injection pipe, 22...Guide tube, 23...Through hole, 24...
Swing mechanism (spherical bearing), 25... Inner race, 26... Outer race, 27... Housing, 32... Shielding plate.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A shield body in which the face side and the interior of the machine are separated by a bulkhead, a cutter wheel attached to the front side of the bulkhead of the shield body, and a guide for a drug injection pipe attached to the shield body by penetrating the bulkhead. When the excavation operation is stopped, a supplementary chemical injection pipe is passed through the guide cylinder from the inside of the machine, and its tip protrudes from the gap between the cutter wheels toward the face side, and is installed inside the machine. In a shield excavation machine capable of improving the soil quality of the ground by rotating and feeding the chemical injection pipe with a drill device to make it drill into the ground to a predetermined depth, and injecting a chemical solution into the ground through the chemical injection pipe. , a through hole having a diameter larger than the outer diameter of the guide tube is provided in the partition wall, the guide tube is fitted into the through hole, and a guide tube is provided between the outer circumferential surface of the guide tube and the inner circumferential surface of the through hole. A swinging mechanism that supports the cylinder in a freely swinging manner is provided, and a flexible shielding plate is attached to the face side of the partition wall to isolate the swinging mechanism from the face side, and the drilling direction of the drug injection pipe is changed. A shield excavator characterized by the ability to 2. The swinging mechanism is composed of a spherical bearing, and the inner race of the spherical bearing is fitted onto the guide cylinder, and the outer race is fitted into a cylindrical housing provided by fitting into the through hole. A shield excavator according to claim 1 of the utility model registration claim, characterized in that: