JPH0776507B2 - Widening method of shield excavation hole and its equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavation hole widening method and a device therefor, and more particularly to a shield excavation hole widening for constructing a branch road, a station or the like for a shield excavation hole excavated by a shield machine. A construction method and an apparatus thereof.

[0002]

[Prior Art] Recently, underground development is actively carried out,
Construction of underground tunnels is increasing. This underground tunnel is mainly constructed by a shield machine, but it may be necessary to partially widen the shield tunnel during excavation. Conventionally, as a concrete widening method, FIG.
As shown in, a shield machine 2 having a size including the widened portion 1
There is a method of excavating the widened portion together with the shield tunnel 3 by digging in.

As shown in FIG. 9, a frozen soil block 6 is formed by burying a large number of frozen pipes 5, 5 ... From the inside of the shield tunnel 4 toward the widened portion 1 by a freezing method. There is also a method of constructing the widened portion 1 by widening the inside.

[0004]

However, in the conventional widening method shown in FIG. 8, a shield excavation hole larger than the originally required shield excavation hole 5 must always be excavated. However, it has a drawback that the construction period is significantly prolonged and the efficiency is low. In addition, the conventional widening method shown in FIG. 9 requires a large number of freezing holes, and it is difficult to widen the freezing pipes 4 left in the widening portion 1 because the freezing pipes 4 left in the widening portion 1 are obstructed due to cost and construction period. There is.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for widening a shield excavation hole and a device therefor which can shorten the construction period and can easily widen the width. To do.

[0006]

In order to achieve the above object, the present invention relates to a method for widening a shield excavation hole in which a shield excavation hole is widened. And a bending pipe provided with, and an excavator equipped with a drive source, the tip bit of which can be swung forward of the inner pipe, is arranged to be insertable into the bending pipe, and is propelled toward the periphery of the widened portion,
While excavating the bit while rotating the bit, the excavating device is advanced while correcting the direction based on the propulsion position information measured by the position measuring device, and the curved pipe is propelled to the excavation hole to be embedded around the widened portion and embedded. After the completion, with the curved pipe left, the inner pipe is pulled out from the curved pipe together with an excavator, a ground improvement injection pipe is inserted into the curved pipe, and a freezing agent or cement milk is improved in the ground improvement injection pipe. Characterized by supplying agent to improve the ground around the widened part

[0007]

According to the present invention, first, from the inner peripheral portion of the shield excavation hole, the curved pipe having the movable shoe at the tip and the inner pipe to which the excavator is attached are directed toward the periphery of the widened portion. Promote. Next, the bit of the excavator is rotated by a bit driving source connected to the excavator, and the excavator is excavated while correcting the direction based on the propulsion position information measured by the position measuring device. Then, at the same time, the curved pipe is propelled into the drill hole to be embedded around the widened portion. After the burial is completed, the inner pipe is pulled out from the curved pipe together with the excavator while the curved pipe is left, and the ground improvement injection pipe is inserted into the curved pipe. After the insertion, the ground improvement injection pipe is frozen or subjected to an improvement means such as cement milk to solidify and improve the ground around the widened portion. After the ground improvement, the widening work of the widening part is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the shield joining method and apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side view showing a first embodiment of a shield joining device according to the present invention, in which a propulsion device 12 installed in a shield tunnel 10 to a curved pipe 14 shown in FIGS. It is shown penetrating the segment 16 and being propelled around the widened portion 18.

An opening 20 is formed in the upper portion of the segment 16.
Is formed. This opening 20 has a curved pipe-shaped mouthpiece 22.
Are fixed from the inside of the shield tunnel 10. As shown in FIG. 1, a water shutoff valve 28 and a water shutoff device 30 for the curved pipe 14 are provided at the lower end of the mouth pipe 22.
The water shutoff valve 28 and the water shutoff device 30 include the curved pipe 14
And the curved pipe 14 is sent out in the direction indicated by the arrow in the figure by the propulsion device 12 described above.

The propulsion device 12 comprises a curved pipe feed cylinder 32, an inner pipe water stop valve 34, an inner pipe water stop device 36, and an inner pipe feed cylinder 38, which are shown by dotted lines in the figure. The curved tube feed cylinder 32 is connected to the curved tube 14 via the original pressing case 90, and the curved tube 14 can be fed out by extending the cylinder rod 40 whose end is connected to the propulsion device base. Further, the inner pipe feed cylinder 38 is connected to an inner pipe 44, which will be described later, via a case 91, and the cylinder rod 42 whose end is connected to the original pushing case 90 extends so that the inner pipe 44 moves in the direction of the arrow in the drawing. Can be sent to.

By the way, as shown in FIGS. 1 and 2, the curved pipe 14 is constructed by connecting a large number of curved short pipes 46, 46, .... The short tube 46 is formed with a curvature that can surround the widened portion 18 in an arc shape. Also, the inner pipe 4
Similarly, 4 is also configured by connecting a large number of curved short tubes 50, 50 ... The short tube 46 is formed with a curvature that allows it to be inserted into the curved tube 14, and is connected by a pin 52 shown in FIG.

On the other hand, as shown in FIG. 3, a cylindrical shoe 54 is attached to the tip of the curved pipe 14. The Shu 54
Since the hemispherical boss portion 56 formed on the rear end side is slidably contacted with the hemispherical groove 58 formed on the distal end side of the curved pipe 14, the hemispherical boss 56 swings with respect to the curved pipe 14. Connected as possible. A drilling device 60 is connected to the tip of the inner pipe 44. The excavator 60 is disclosed in Japanese Patent Application Laid-Open No. 61-137997 and Japanese Patent Application Laid-Open No. 61-1313 previously filed by the present applicant.
It has the same concept as the excavator disclosed in Japanese Patent Publication No. 7998.

That is, the excavator 50 includes an oil motor 62,
It is composed of a swing device 64, a speed reducer 66 and a bit 68. The oil motor 62 includes the shield tunnel 1
From the oil pump (not shown) disposed inside
A hydraulic hose 70 wired inside is connected, and the rotational driving force of the oil motor 62 is transmitted to the bit 68 via the speed reducer 66. The swinging device 64 is provided with, for example, four cylinder rods (only one is shown in FIG. 3) 72, 72 ... At equal intervals, and the expansion / contraction operation of these cylinder rods 72, 72 is performed by the shield tunnel 1
It is remotely controlled by a hydraulic hose 63 wired from 0 to the inner pipe 48. That is, by selecting these cylinder rods 72, 72 ... And extending them in the left direction in the figure, the movable device composed of the speed reducer 66 and the bid 68 is moved, and the shoe 54 including this movable device is also moved. You can swing the head by following.

The bit 68 includes a pair of expansion / contraction bits 7.
4, 74 are attached. The expansion / contraction bits 74, 74 are rotatably provided about the pins 76, 76 as fulcrums, and are configured to be capable of expanding the diameter. That is, when the expansion / contraction bit 74 projects from the tip of the movable shoe 54, the expansion / contraction bit 74 expands to a position on the upper side in the drawing, and when it is inserted into the curved pipe 14 and the movable shoe 54, the expansion / contraction bit 74 does not interfere with the insertion and contracts to the position on the lower side in the drawing. It is urged by an urging member (not shown) so as to have a diameter.

Further, a plurality of guide ribs 77, 77, ... Are arranged between the curved pipe 14 and the inner pipe 44 and between the curved pipe 14 and the excavator, respectively, and the inner pipe 44 is coaxial with the curved pipe 14. Holding on. Further, a packer 77a is provided between the curved pipe 14 and the inner pipe 44, and this packer 77a is
The water is prevented from entering through the clearance between the shoe 54 and the excavator 60 by being inflated at the time of attachment / detachment.

An optical fiber gyro 78, which is a hole core measuring instrument, is provided in the inner tube 44 so that it can be inserted therethrough. This optical fiber gyro 78 is attached to a cable reel (not shown) via a cable 80 so as to be freely rewound and rewound, and by being wound on the cable reel at a predetermined speed, the propelling position of the bending tube 14 can be measured. .

Next, the operation of the shield excavation hole widening device configured as described above will be described. First, as shown in FIG. 1, the upper portion of the segment 16 is opened, and the mouth pipe 22 is connected to the opening 20. Next, this mouth pipe 22
The curved pipe 14 in which the curved short pipes 46, 46 are connected to each other is inserted and sequentially sent out by the propulsion device 12, and the curved pipe 1
The inner tube 44 is inserted into the No. 4 and sequentially sent out by the propulsion device 12. At this time, the curved pipe 14 and the inner pipe 44 are formed in the widened portion 1
Since the excavation device 50 attached to the curved pipe 14 and the inner pipe 44 is formed to have a curvature capable of enclosing the arc 8 in an arc shape, as shown in FIG. To drill.

However, the curved pipe 14 does not always propel in the direction of surrounding the widened portion 18 in an arc shape. Therefore, when it is determined that the excavation path of the excavation device 60 is deviated by the detection of the direction of the optical fiber gyro 78 while the curved pipe 14 is being propelled, it is deviated from the cylinder rods 72, 72, ... Shown in FIG. The cylinder rod 72 in the direction is extended to swing the bid 68 in the traveling direction. Thereby, the excavation course can be easily corrected.

Next, as shown in FIG. 4, the excavator 60 is stopped when the curved pipe 14 is excavated and inserted to a position surrounding the widened portion 18 in an arc shape, and the inner pipe 44 is excavated by the excavator 60. At the same time, pull out from the curved pipe 14. As a result, the curved pipe 14 is embedded so as to surround the widened portion 18. Then, a freezing pipe (not shown) is inserted into the curved pipe 14 from the shield tunnel 10 side, and a part of the widened portion 18 is frozen by the freezing pipe to start the improvement of the surrounding ground.

In this manner, the propulsion device 12 is sequentially moved along the widened portion 18 in the shield tunnel 10 so that the plurality of curved pipes 14, 14, ... Are moved around the entire widened portion 18 as shown in FIG. It is buried in parallel at a constant interval so as to surround it. Then, freezing pipes are sequentially inserted into the curved pipes 14, 14 ... From the shield machine 10 side, and the entire circumference of the widened portion 18 is frozen by the freezing pipes to create a frozen soil wall 82 shown in FIGS. Improve the ground.

Then, at the timing when the frozen soil wall 82 is sufficiently formed, the widening work of the widening portion 18 is started. Therefore, since the ground of the widened portion 18 is protected by the improved frozen soil wall 82 in the surroundings, it is possible to prevent a disaster such as collapse due to excavation, flooding, and the like, and it is possible to easily widen the soil compared with the conventional widening construction method. it can. . As described above, in the present embodiment, a large number of curved pipes 14, 14, ... Are embedded so as to surround the widened portion 18 in an arc shape, and the frozen soil wall 82 is formed in an arc shape to be widened. Compared with the above, it is possible to effectively improve the ground of the widened portion and to significantly reduce the construction period.

Further, as shown in FIG. 6, when widening between the shield tunnels 10 and 11 excavated adjacent to each other, one of the shield tunnels 10 and 11 (the shield tunnel 10 in this embodiment) is bent. The frozen soil wall 82 may be formed by embedding 14 and 15 around the widened portion 19 by the procedure described above. By the way, FIG. 7 shows a second embodiment of the shield drilling hole widening device according to the present invention.
The curved pipe 84 is configured by connecting a plurality of straight tubular short pipe units 85, 85 ... This short tube unit 85 has an inner diameter,
The small outer diameter portion 85b of the short pipe unit 85 connected to the large inner diameter portion 80a is formed in a stepped shape having large and small outer diameters so that the movable gap 8 is formed.
6 is inserted. A packing (not shown) is attached to the small outer diameter portion 85b. This packing is embedded in a groove (not shown) formed in the peripheral portion of the small outer diameter portion 85b, and its outer peripheral portion is slidably contacted with the large inner diameter portion 85a.
Prevents water from entering from the outside.

The short pipe units 85, 85 are connected by a pin 88 so that they can be bent in one direction.
The pin 88 is fixed by a bolt 89.
That is, the short pipe unit 85 can be bent in the bending direction by the movable gap 86 by using the pin 88 as a fulcrum.
Therefore, the curved tube 84 is configured so as to be bent with a small curvature as a whole.

On the other hand, since the inner pipe 92 is also constructed in the same structure as the curved pipe 84 described above, its explanation is omitted. Therefore, the inner tube 92 is configured so that the entire inner tube 92 bends with a small curvature like the curved tube 84. Therefore, according to the second embodiment, even if the curved pipe 84 and the inner pipe 92 are connected to each other by a straight tubular short pipe so as to be bendable, it is possible to follow a predetermined excavation device that is advanced while the direction is corrected by the optical fiber cable. Can be propelled in position. Thereby, even in the second embodiment, the same effect as that of the first embodiment can be obtained.

Although the freezing pipe is inserted into the curved pipe 14 in this embodiment, the present invention is not limited to this, and the grout pipe is inserted and cement milk or the like is injected to improve the ground. You can

[0026]

As described above, according to the method and apparatus for widening the shield excavation hole according to the present invention, the curved pipe having the movable shoe at the tip and the inner pipe are enlarged from the inside of the shield excavation hole. Propulsion toward the circumference of the inner pipe, rotating the bit of the excavator attached to the tip of the inner pipe with the bit drive source, and correcting the direction based on the propulsion position information measured by the position measuring device While simultaneously excavating, the curved pipe is propelled into the excavation hole and embedded around the widened portion, and after the burying is completed, the inner pipe is pulled out from the curved pipe together with the excavation device with the curved pipe left, The ground improvement injection pipe was inserted into the pipe to inject the improver, and the ground around the widening part was improved to perform the widening work of the widening part, so the construction period required for the widening work should be greatly shortened. And can be easily widened Can

[Brief description of drawings]

FIG. 1 is a first part of a shield drilling hole widening device according to the present invention.
Explanatory drawing showing an example

FIG. 2 is a cross-sectional view showing an embodiment of a curved pipe applied to a shield drilling hole widening device according to the present invention.

FIG. 3 is a cross-sectional view of a main part of an excavation device applied to a shield excavation hole widening device according to the present invention.

FIG. 4 is an explanatory view of widening a tunnel by the shield excavation hole widening method according to the present invention.

5 is a sectional view taken along the line AA in FIG.

FIG. 6 is an explanatory view of widening a tunnel by the shield excavation hole widening method according to the present invention.

FIG. 7 is a second embodiment of the shield drilling hole widening device according to the present invention.
Explanatory drawing showing an example

FIG. 8 is an explanatory view showing a first embodiment of a conventional method for widening a shield excavation hole.

FIG. 9 is an explanatory view showing a second embodiment of a conventional method for widening a shield excavation hole.

[Explanation of symbols]

 10 ... Shield tunnel 12 ... Propulsion device 14 ... Curved pipe 44 ... Inner pipe 46, 50 ... Curved short pipe 60 ... Excavation device 62 ... Oil motor 64 ... Swing device 66 ... Speed reducer 68 ... Bit 78 ... Optical fiber gyro

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-61-137998 (JP, A) JP-A-58-91294 (JP, A) JP-A-1-151693 (JP, A)

Claims (2)

[Claims] 1. A method for widening a shield drilling hole for widening a shield drilling hole, comprising:
A curved pipe with a movable shoe at the tip and an excavator with a drive source that allows the tip bit to swing ahead of the inner pipe are arranged so that they can pass through the curved pipe, and propelled toward the periphery of the widened portion. While rotating the bit, the excavator is advanced while correcting the direction based on the propulsion position information measured by the position measuring device, and the curved pipe is propelled to the excavation hole to be embedded around the widened portion. After the burial, the inner pipe is pulled out together with the excavator from the curved pipe with the curved pipe left, the ground improvement injection pipe is inserted into the curved pipe, and the ground improvement injection pipe is frozen or cement milk or the like. Shield excavation hole widening method characterized by improving the ground around the widened part by applying the improvement means of 2. A shield excavation hole widening device for enlarging a shield excavation hole, comprising a pipe body propelled from a peripheral portion of the shield excavation hole to the periphery of the enlarged portion and having a movable shoe at its tip. A curved pipe, an inner pipe that is insertable into the curved pipe and is made of a pipe body, a position measuring device that is insertable into the inner pipe and measures the propulsion position of the curved pipe, and is provided at the tip of the inner pipe and An excavator equipped with a bit capable of passing through a curved pipe and having a swingable tip and a drive source for the bit and a direction correcting mechanism, and each end of the curved pipe located on the shield drilling hole side. A water stop device provided, and a widening device for a shield drilling hole, comprising: