JP2770113B2 - Injection device with double packer for curved pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device with a double packer for use in improving the ground around a shield tunnel particularly at a junction of a shield machine, a branch point widening portion, a station widening portion, and the like.

[0002]

2. Description of the Related Art In recent years, underground development has been actively carried out.
Construction of underground tunnels is increasing.

[0003] This underground tunnel is mainly constructed by a shield machine, but when the excavation length is long, two shield machines are used to excavate from both sides of the planned joining point, and the shield machine is joined underground. The ground between shield machines is cut open, and excavation for joining is performed manually. In addition, in some cases, such as a branch of a route or a station, it is necessary to partially widen the shield tunnel.

Conventionally, in these works, the ground around the shield has been improved by a freezing method or a grouting method in order to cope with springing of groundwater and subsidence of the surrounding ground.

In the freezing method, for example, as shown in FIG.
A large number of small holes are bored in a substantially annular shape from 1, 63 toward the respective joining scheduled points.
Are buried in an inclined state around the joint, and a refrigerant is circulated through the freezing pipes 53, 53 to completely freeze the vicinity including the planned joining point to form the frozen soil wall 55. Afterwards, the inside is cut open to perform the joining work.

As shown in FIG. 23, the ground improvement of the widened portion is performed by burying a large number of freezing pipes 68 from the inside of the shield tunnel 67 toward the widened portion F to form a frozen soil block 69. Then, the inside of the frozen soil block 69 is excavated to construct a widened portion.

[0007]

However, when the ground improvement of the junction of the silled machine is performed by the freezing method, it is necessary to perform the ground improvement work with both shield machines. Must wait for the other shield to arrive before freezing. Therefore, there is a problem that a longer construction period is required.

In order to cope with this, as shown in FIG. 22, a plurality of long freezing tubes 57, 57,... In addition, although a method of waiting for the shield machine 63 of the later arrival is also adopted, the shield machine 61 of the earlier arrival has a large frozen ground area, and it is difficult to stop and reinforce the ground on the shield side of the later arrival. In some cases, it is necessary to insert new auxiliary freezing pipes 65, 65 ... from the shield machine 63 that arrives later to rebuild the frozen soil wall, and consequently shorten the construction period. In some cases, the ground improvement effect from the first arrival shield machine 61 may not be sufficiently obtained.

Further, in the case of the ground improvement of the widened portion by the above-mentioned freezing method, a large number of freezing pipes are required, cost and construction cost are expended, and the freezing pipe 68 remaining in the widened portion F becomes an obstacle in widening excavation. Therefore, there is a problem that the excavation requires extra time and labor.

Therefore, in the present invention, ground improvement such as a junction of a shield machine, a widened shield portion, etc. can be effectively performed, and a construction period can be greatly shortened, and a ground improvement for a shield capable of reducing a construction cost can be achieved. It is an object of the present invention to provide an injection device with a double packer for performing injection using a curved tube buried in the ground as an outer tube.

[0011]

SUMMARY OF THE INVENTION For this purpose, the contract of the present invention is described.
The invention according to claim 1 is characterized in that a curved pipe having a curved portion at least in part and having nozzles provided at predetermined intervals along a pipe axis direction in a pipe wall portion, which is inserted and installed in the ground, is used for injection. An injection device with a double packer for performing ground injection while sealing the front and rear of a nozzle to be injected, which is inserted inside the outer tube for injection as a tube, and constitutes a central axis of the device.
End pipes are spaced at the outer circumference of both ends of the feed pipe.
A rubber thread for the packer is provided between these end cylinders.
For the feed pipe, both ends of the cylinder and the packer
A liquid-tight inner space is defined by a rubber sleeve.
Pressure and discharge of the packer water into the inner space.
The rubber sleeve for the packer is configured to expand and contract.
Paired short packers are spaced longitudinally
Is, these packers are connected by a chain, front
The tip of one feed pipe faces between the packers and discharges
Configured to discharge the ground filler through the hole,
Through holes are formed to face in said hollow portion to the other feed pipe, before
The flexible injection is performed by communicating with the feed pipe of one of the packers.
Agent hose is connected to the inner space of the one packer.
Water connected in parallel with the injection hose
A hose is connected and a water hose is connected to the feed pipe of the other packer.
Daburupa' for bend, wherein the over scan is connected, was
It is an injection device with a car. The invention according to claim 2 provides the ground
Do you have a curved part at least partially inserted and installed inside
Nozzles are provided on the pipe wall at predetermined intervals along the pipe axis
The bent tube is used as the outer tube for injection, and the inside of the outer tube for injection is
Into the ground while sealing around the nozzle to be injected
An injection device with a double packer for performing injection,
At the outer periphery of both ends of the feed pipe that constitutes the central axis of the device
End cylinders are provided at intervals and these end cylinders are provided.
A rubber sleeve for the packer is provided between the cylinders ,
Both ends are separated by a cylinder and a rubber sleeve for packers
A liquid-tight inner space is formed, and the packer for this inner space is
Rubber three for packer by pumping and discharging water
The short packer is designed to expand and contract
Are a pair spaced direction, these packers Ji
And the leading end of one of the feed pipes is
Facing between the packers and discharging the ground injection agent through the discharge hole
The feeder tube of the one packer
Flexible infusate hose is connected to communicate with a, the one
Communicating with the inner space of one of the packers, and
A water hose arranged in parallel with the
The inner space of the packer and the inner space of the other packer
And characterized in that it is connected by a flexible feed hose was
It is an injection device with a double packer for curved pipes.

[0012]

According to the ground improvement method according to the present invention, the injection is carried out in parallel with the tunnel direction or in an arc shape at the outer peripheral portion where the shield machine after stopping arrives from the shield machine side which has stopped earlier at the joining scheduled point. Insert and install the outer tube. In the case of a shield widening portion, the outer tube for injection is inserted and installed in a curved shape around the widening portion. Each of these outer pipes for injection has a curved portion or is entirely arranged in a curved shape, and thus cannot be injected by a double packer injection pipe conventionally used.

In the present invention Accordingly, the chain so as to be corresponding to the curvature packer each other of the injection outer tube
It is an injection device with a double packer connected more . Also, since hoses are used to supply the packer water and the ground conditioner, it is possible to cope with the bending of the curved pipe.

[0014] By improving the ground of the junction and the widened part of the siludo machine in accordance with the above-mentioned procedure, the ground which is integrally fixed to the periphery of the outer pipe for injection installed in a curved shape around the ground improvement area is used as an improvement core. Thereby, a strong solidified wall using the outer tube for injection as a reinforcing material can be formed. Also, if necessary, the thickness of the outer pipe for injection is increased, or the injection apparatus with a double packer is removed after the ground injection is completed, and concrete is filled in the outer pipe for injection, thereby increasing the strength of the solid pipe. A barrier can be created.

Further, with the ground improvement method according to the present invention, it is possible to limit the range of formation of the improvement area by defining the nozzle mounting position of the outer pipe for injection, and to reduce the area of the buried outer pipe for injection. It is also possible to perform ground improvement with a limited improvement range, such as a part, for example, only the tunnel ceiling side part.

A method has been disclosed in which a flexible freezing tube is inserted into a curved pipe to freeze the surrounding ground. In the case of the freezing method, a refrigerant is circulated during the ground freezing period. Therefore, it is not possible to fill the buried pipe with concrete or the like or to perform ground improvement with a limited improvement area as in the present invention.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. First, as a first embodiment, a case where a widened portion is formed on a side portion of the shield tunnel 10 for branching a route will be described in detail. FIG. 1 shows a state in which a curved pipe 14 serving as an outer pipe for injection according to the present invention is propelled around a widened portion F through a segment 16 from a propulsion device 12 described later installed in a shield tunnel. It is shown.

An opening 20 is provided above the segment 16.
Is formed. The opening 20 has a curved tubular mouth tube 22.
Are fixed from the inside of the shield tunnel 10. As shown in FIG. 1, a water stop valve 28 and a water stop device 30 for the bent tube 14 are provided at the lower end of the mouth tube 22. The bent pipe 14 is inserted through the water stop valve 28 and the water stop device 30, and the bent pipe 14 is sent out by the propulsion device 12 in a direction indicated by an arrow in the drawing.

The propulsion device 12 comprises a bent 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 indicated by dotted lines in the figure.

The curved tube feed cylinder 32 is provided with the curved tube 14.
The bent pipe 14 can be sent out by extending the cylinder rod 40, which is connected to the propulsion device base through the main push case 90. The inner tube feed cylinder 38 is provided with a case 91 in an inner tube 44 described later.
The inner pipe 44 can be sent out in the direction of the arrow in the figure by extending the cylinder rod 42 connected at its end to the main push case 90. The curved tube 14
As shown in FIG. 2, a number of curved short tubes 46, 46. Similarly, the inner tube 44 is formed by connecting a large number of short curved tubes 50, 50... With pins 52 and having a curvature that allows the curved tube 14 to be inserted.

As shown in FIG. 9 (not shown in FIGS. 1 to 8 for simplicity), the rubber nozzles 1, 1 are provided at appropriate positions in the circumferential direction on the body of the curved tube 14. ... are provided. In the rubber nozzle 1, for example, a circular hole 14 a is formed in the tube wall of the curved tube 14.
A nozzle holder 2 having a hat-shaped cross section and a nozzle hole 2a formed at the center is fitted to the nozzle holder 4a and fixed by welding or the like, and semicircular rubber plates 7, 7 are fitted into the recess 2b of the nozzle holder 2. Are arranged oppositely so that a slit S is formed at the center, and the holding ring 6 is screwed and fixed to the concave portion 2b. The rubber nozzles 1 are provided, for example, at an interval of 2 to 4 nozzles / m in the longitudinal direction of the pipe.

The rubber nozzle 1 is provided at an arbitrary position in the circumferential direction. For example, when the rubber nozzles 1 are arranged uniformly in the circumferential direction, as shown in FIG. A consolidated body G is formed. In addition, as shown in FIG. 13, when the rubber nozzle 1 is provided at one location in the circumferential direction, the rubber nozzles are provided at the upper part of the curved tube 14 and, as shown in FIG. When 1, 1,... Are provided, the solidified bodies G are formed in the upper portions including the side portions. Thus, by adjusting the mounting position of the rubber nozzle 1 with respect to the curved pipe 14, the ground improvement can be performed while limiting the ground improvement range.

On the other hand, as shown in FIG. 3, a cylindrical shoe 54 is attached to the tip of the curved tube 14. The Shu 54
Is that the hemispherical boss portion 56 formed on the rear end side slides on the hemispherical groove 58 formed on the front end side of the curved tube 14, thereby swinging the curved tube 14. Linked as possible.

An excavator 60 is connected to the tip of the inner pipe 44. This excavator 60 is disclosed in Japanese Patent Application Laid-Open Nos. 61-137997 and 61-13-13 filed by the present applicant.
It has the same concept as the excavator disclosed in Japanese Patent No. 7998.

That is, the excavator 60 includes an oil motor 62, a swing device 64, a speed reducer 66, and a bit 68. The oil motor 62 is connected to the shield machine 1
0 from an oil pump (not shown)
Is connected, and the rotational driving force of the oil motor 62 is transmitted to the bit 68 via the speed reducer 66. The swing device 64 includes:
4 cylinder rods (only one is shown in FIG. 3) 7
Are provided at equal intervals, and the expansion and contraction operation of these cylinder rods 72, 72
4 is remotely controlled by a hydraulic hose 73 wired inside. That is, by selecting these cylinder rods 72 and extending them in the left direction in the figure, the movable device constituted by the speed reducer 66 and the bid 68 is moved, and the aforementioned movable device is included. Shu 5
4 can be swung.

The bit 68 includes a pair of scaled bits 7
4, 74 are attached. The expansion / contraction bits 74, 74 are rotatably provided with the pins 76, 76 as fulcrums, and are configured to be able to advance in diameter. That is, when the expansion / contraction bit 74 protrudes from the tip of the movable shoe 54, the diameter of the expansion bit 74 increases to the upper position in the drawing, and when the bending bit 14 is inserted into the curved tube 14 and the movable shoe 54, the expansion bit 74 contracts to the lower position in the drawing. It is urged by urging means (not shown) so as to have a diameter.

A plurality of guide ribs 77 are provided between the curved pipe 14 and the inner pipe 44 and between the curved pipe 14 and the excavator 60.
And holds the inner tube 44 coaxially with the curved tube 14. Further, a packer 77a is provided between the curved tube 14 and the inner tube 44.
Water from the clearance between the drilling device and the excavator 60 is prevented.

In the inner tube 44, an optical fiber gyro 78 as a hole core measuring device is provided so as to be inserted therethrough. The optical fiber gyro 78 is wound around a cable reel (not shown) via a cable 80 and is attached so as to be freely rewound, and can be wound at a predetermined speed by the cable reel to measure the propulsion position of the curved tube 14. I can do it.

On the other hand, as an injection device inserted into the curved pipe 14 for press-fitting the ground injection agent, as shown in FIG. 10, for example, packers 4A and 4B which can be expanded by feeding water are used. In order to be able to cope with the curvature of the curved tube 14, the injection device 3 with a double packer connected by a chain 25 is used. As shown in FIG. 10, the ground injection is carried out so that the packer 4 is straddled over the rubber nozzle 1 to be injected.
A, 4B are positioned, and firstly, water for the packer is sent to the packers 4A, 4B from the water hoses 27A, 27B, respectively.
In a state where the rubber packers 5A and 5B of the packers 4A and 4B are expanded and inflated until the rubber packers 5A and 5B come into contact with the inner wall of the curved tube 14, the ground improving agent is sent from the hose 26 for the injecting agent and formed on the connection holder 29. By discharging the ground filler into the space between the packers 4A and 4B from the discharge holes 29a, the filler is injected into the ground so as to push and spread the rubber nozzle 1.

The structure of the packers 4A and 4B will be described in detail with reference to FIG.
Is a body in which a rubber sleeve 5A for a packer is held by end cylinders 31 and 33. When water for the packer is supplied to the inner space P and pressure is applied, the rubber sleeve 5A for the packer is moved to the side. It is configured to abut on the inner wall of the bent tube 14 to seal. The end cylindrical body 31 is a ring-shaped metal having a substantially U-shaped cross section,
An annular concave groove 31a for fitting the side edge of the rubber sleeve 5A is formed in the surrounding rising flange portion, and a plurality of saw-like projections 31b, 31b... Are provided on one inner wall surface of the concave groove 31a. Is formed. A hole 31c for supplying packer water is formed in the end face, and the packer water hose 27A is formed in the hole 31c.
Is connected. Further, an end bush 35 is fitted into the central through hole. The end cylindrical body 33 at the other end has substantially the same configuration except that the hole for the packer water is not formed. On the other hand, on both side edges of the rubber sleeve 5A, receiving grooves 5a, 5b,... Respectively meshing with the saw-like protrusions 31b, 33b formed on the inner walls of the concave grooves 31a, 33a are formed. By meshing with each other, the rubber sleeve 5A swells and does not easily come out even if a pulling force acts.

A feed pipe 39 for a ground injection agent is inserted into the center holes of the end bushes 35 and 37, and a connection holder 29 is screwed on the end bush 37 side. The bodies 31, 33 are fixed. A screw is cut at the left end 39a of the feed pipe 39 in the drawing, and the infusion hose 26 is connected.

By the way, the connecting holder 29 and the connecting holder 41 of the packer 4B are connected by a chain 25 so as to be able to cope with the bending of the curved pipe 14. This connecting mode is important for the present invention. Element. sand
That is, when the curvature is small, for example,
As described in Japanese Patent No. 3235, a flexible injection tube device is used.
Supply the filler and packer fluid
If the curvature is large, the injection tube
The device makes insertion very difficult. However, the present invention
In, short packers are connected by a chain
The packer contains flexible infusion hoses and water hoses.
As it is connected, it flexes freely in the chain,
Flexes with the injection hose and water hose, so the overall size is large.
Even if it is a curved part with a large curvature, double packer
Can be inserted.

On the other hand, the packer 4B is basically constructed in the same manner as the packer 4A, but since there is no need to feed the injectant, the feeder pipe 4 connecting between the end bushes on both sides is provided.
The packer 3 is used as a packer channel, and the packer water is fed into the packer 4B from the intermediate through hole 43a to expand the rubber sleeve 5B.

Next, a procedure for improving the ground of the widened portion F of the shield tunnel by the ground improving apparatus configured as described above will be described. First, as shown in FIG. 1, the upper portion of the segment 16 is opened, and a mouth tube 22 is connected to the opening 20. Next, the curved tube 14 having the curved short tubes 46, 46... Connected thereto is inserted into the mouth tube 22 and sequentially sent out by the propulsion device 12, and the inner tube 44 is inserted into the curved tube 14 by the propulsion device 12. Send out sequentially.
At this time, since the curved pipe 14 and the inner pipe 44 are formed with a curvature capable of surrounding the widened portion F in an arc shape, the excavator 60 attached to the curved pipe 14 and the inner pipe 44 is shown in FIG. As shown, the ground is excavated so as to surround the widened portion F in an arc shape.

However, the curved pipe 14 does not always propel accurately in a direction surrounding the widened portion F in an arc shape. Therefore, when the direction of the optical fiber gyro 78 is detected during the propulsion of the curved pipe 14 and it is found that the excavation path of the excavator 60 has deviated, the cylinder rods 72 shown in FIG. The cylinder rod 72 in the direction is extended, and the bid 68 is swung in the traveling direction. This makes it possible to easily correct the excavation course.

Next, as shown in FIG.
When the excavator 60 is excavated and inserted to a position surrounding the widened portion F in an arc shape, the excavator 60 is stopped, and the inner pipe 44 is connected to the excavator 60.
Together with the tube 14. Thereby, the curved pipe 14
Is embedded so as to surround the widened portion F. And FIG.
11, the injection device 3 with a double packer shown in FIG. 11 is inserted into the curved pipe 14, and the double packers 4 </ b> A and 4 </ b> B are sequentially positioned across the rubber nozzle 1 of the curved pipe 14. By injecting the ground injection agent between the packers, the ground injection agent is injected into the ground through the rubber nozzles 1, 1,... To improve the ground around the curved pipe 14. The injection device 3 with a double packer can be moved by pushing and pulling the water hoses 27A and 27B for packers and the hose 26 for the injecting agent inserted from both ends of the curved tube 14. In addition, the position adjustment can be performed by measuring the extension length of the hoses.

In the following, the propulsion device 12 is sequentially moved in the shield tunnel 10 along the widened portion F to move the plurality of curved pipes 14 and 14 as shown in FIG.
Are buried at regular intervals in a substantially parallel manner so as to surround the entire periphery of. Then, the injection device 3 with a double packer is sequentially inserted into each of the curved pipes 14, 14,... From the side of the shield tunnel 10, and the ground around the curved pipe 14 is improved in the same manner as in FIGS.
A consolidation wall 82 is formed to improve the surrounding ground. Also,
If necessary, after the injection is completed, the injection device 3 with a double packer is removed, and concrete is filled in the curved pipe 14, whereby a high-strength solidified wall 82 using the curved pipe 14 as a reinforcing material can be formed.

Then, the excavation work of the widened portion F is started at the timing when the consolidation wall 82 is sufficiently hardened. Therefore,
Since the periphery of the widened portion F is protected by the improved solidified wall 82, it is possible to prevent disasters such as collapse due to digging, flooding, etc., and it is possible to easily widen the width as compared with the conventional widening method. .

As described above, in the present embodiment, a large number of curved pipes 14, 14,... Are embedded so as to surround the widened portion F in an arc shape, and the solidified wall 82 is formed in an arc shape. Compared with the widening method, the ground improvement of the widened portion can be effectively performed, and the construction period can be significantly shortened.

On the other hand, as shown in FIG. 6, in the case of widening for constructing a station or the like between the excavated shield tunnels 10 and 11, one of the shield tunnels 10 and 11 (this embodiment) In this case, the bent pipes 14 and 15 may be buried around the widened portion F from the shield tunnel 10) by the above-described procedure to form the consolidated wall 82.

Furthermore, the ground improvement method of the present invention can be widely applied to a case where an underground base is constructed beside a vertical shaft or a horizontal shaft, and a case where a curved buried pipe is installed below an underground structure. .

FIGS. 7 and 8 show another example of a curved tube according to the present invention. The curved tube 84 is configured by connecting a plurality of straight tubular short tube units 85.
The short tube unit 85 is formed with a step having a large or small inner diameter and an outer diameter, and is connected to the large inner diameter portion 85a.
Is inserted with a movable gap 86 therebetween.
A packing 87 is attached to the small outer diameter portion 85b.
The packing 87 is embedded in a groove 83 formed on the periphery of the small outer diameter portion 85b, and its outer peripheral portion is slidably contacted with the large inner diameter portion 85a to prevent water from entering from outside.

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

On the other hand, the inner tube 92 has the same structure as the curved tube 84 whose structure has been described above, so that the description thereof will be omitted. Accordingly, the entire inner tube 92 is configured to bend at a small curvature similarly to the curved tube 84.

Therefore, according to this modification, even if the curved pipe 84 and the inner pipe 92 are connected by a straight short pipe so as to be able to bend, the predetermined direction follows the excavating apparatus which excavates while correcting the direction with an optical fiber cable. At the position of the propulsion. Thus, even in the case of this modification, the effects of the first embodiment can be obtained.

Next, as a second embodiment, the joint portion 24 of the shield tunnel is formed by the ground improvement device according to the present invention.
The case where the ground improvement is performed will be described in detail. In FIG. 15, the inside of the shield machine 21 has already been removed from the drive device of the shield machine main body, and the ground improvement device for joining is arranged. Are formed at predetermined intervals in an inner peripheral portion of the shield machine 21. In each of the openings 96, 96, a mouth pipe 95 is provided with a mouth pipe 95.
It is fixed at a predetermined amount inside the inside 1. A water stop valve 97 and a water stop device 97a of the guide tube 17 described later are connected to an end of the mouth tube 95. In addition, the water stopping device 9
At the subsequent stage of 7, a water stop valve 98 and a water stop device 98a of the propulsion pipe 23 are provided.

The propulsion tube 23 is inserted through the water stop valves 97 and 98 and the water stop devices 97a and 98a, and the propulsion tube 23 is sent out by an extruder 51 in a direction indicated by an arrow in the figure. The extruder 51 includes a propulsion pipe feed cylinder 51a, an inner pipe feed cylinder 51a.
b, the propulsion pipe 23 is sent out by a propulsion pipe feed cylinder 51a, and an inner pipe 94 described later is sent out by an inner pipe feed cylinder 51b in the direction of the arrow in the figure. Further, near the extrusion device 51, an inner pipe 94 is provided.
The water stop valve 93 and the water stop device 93a are provided.

The guide tube 17 is fitted into the mouth tube 95, and the guide tube 17 is buried in an inclined state along the mouth tube 95. In addition, the guide tube 17 has a guide guide hole 1 for guiding the propulsion tube 23 in the direction of the scheduled joining point 24.
7a is formed. As the propulsion pipe 23, one in which a number of straight tubular short pipe units 85, 85... As shown in FIG. 7 are connected and the whole is bent at a small curvature is used. In addition, the same structure as that of the first embodiment is used for the distal end structure of the propulsion pipe 23 and the excavator 60 and the like therein.

An inner pipe 94 is inserted and disposed in the propulsion pipe 23. Since the inner pipe 94 has the same structure as the propulsion pipe 23, the description thereof is omitted.
Therefore, both the propulsion tube 23 and the inner tube 94 are configured to bend at a small curvature as a whole. Further, the rubber nozzles 1 are arranged at appropriate intervals in the longitudinal direction of the propulsion pipe 23.
The same applies to the point that is provided.

In order to improve the ground at the junction of the shield tunnel by using such a device, first, as shown in FIG.
Excavate from both sides of the Next, the water stop valve 97 attached to the mouth pipe 95 shown in FIG. 1 of the shield machine 21 stopped earlier at the joining scheduled point 24 is opened, and the guide pipe 17 is excavated from the shield machine 21 in an inclined direction, and the mouth pipe is cut. Fix to 95. Next, the propulsion tube 23 is sent out by the extrusion device 51.
The direction of the propulsion pipe 23 and the inner pipe 94 is changed along the guide guide hole 17a of the guide pipe 17, and the propulsion pipe 23 and the excavator 6
0 excavates the ground substantially parallel to the excavation direction toward the rear stop shield machine 13 side.

Next, the propulsion pipe 23 is moved to the joining point 2
When the excavator 60 has been excavated and inserted to a predetermined position sufficiently exceeding 4, the inner pipe 94 is pulled out from the propulsion pipe 23 together with the excavator 60. Thereby, the propulsion pipe 23
Is buried above the scheduled joining point 24 and substantially parallel to the direction in which the shield machine 21 excavates.

Note that, without using the guide tube 17,
The propulsion pipe 23 can be dug in an arc shape (tulip shape) as shown in FIG. 17 while appropriately correcting the direction by the optical fiber gyro 78.

In the following, the extruder 51 is sequentially moved to move the plurality of propulsion tubes 23, 12,.
As shown by 9, the shield machine 13 is buried at a constant interval along the outer shape of the shield machine 13 that stops later around the joining scheduled point 24 substantially in parallel with the shield excavation direction (in the case of this figure, it is substantially annular).

When the embedding of the propulsion pipe 23 is completed according to the above-described procedure, the injection device 3 'with a double packer shown in FIG. 20 is inserted, and the injection agent is injected into the ground around the propulsion pipe 23 according to the above-described procedure. To form the consolidated wall 82. Here, in the case of the junction of the silud machine of the present embodiment, since the distal end of the propulsion pipe 23 is buried in the ground, FIG.
The system shown in FIG. 0 for supplying packer water from both sides to each of the packers 4A and 4B cannot be adopted. Therefore, as shown in FIG.
A and a packer 4B are connected by a flexible feed hose 71, so that the packer water supplied from the packer 4A side is supplied also to the packer 4B on the tip side. Used. The double packer-equipped injection device 3 'is moved by using a relatively rigid large-diameter hose as the injection agent hose 26 and pushing and pulling it. The packer 4B on the distal end side is pushed forward by the contact between the connection holder 29 and the connection holder 41 of the packer 4B. The position adjustment in the propulsion pipe 23 can be performed by measuring the feeding length of the injection hose 26.

Thereafter, at the timing when the solidified wall 82 is sufficiently formed, the rear stop shield machine 1 is inserted into the solidified wall 82.
3 to make it approach the front of the shield machine 21 that has stopped earlier. Therefore, the ground with a small thickness between the shield machines is protected by the improved solidified wall 82 around the ground, so that it is possible to prevent disasters such as collapse due to digging and flooding.

As a result, joining between the shield machines becomes possible.

As described above, in this embodiment, a large number of propulsion pipes 2 are used.
.. Are buried so as to surround the planned joining point 24 and substantially in parallel with the excavation direction, so that the solidified wall 82 can be formed from one shield machine 21 side. Therefore,
In the present embodiment, compared to the conventional shield joining method, the ground at the joint can be effectively improved, and the construction period can be significantly reduced.

[0058]

As described above in detail, according to the present invention, it is possible to appropriately and effectively improve the ground by using a curved pipe buried in a junction part of a shield machine, a widened part of a shield tunnel or the like as an outer pipe for injection. In addition, the construction period can be significantly reduced, and the construction cost can be further reduced.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a shield drilling hole widening device according to the present invention.
It is explanatory drawing which shows an Example.

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

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

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

FIG. 5 is a sectional view taken along line AA in FIG. 4;

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

FIG. 7 is a sectional view showing another example of a curved tube (outer tube for injection).

FIG. 8 is an enlarged view of a main part of another example of the curved tube (outer tube for injection) shown in FIG. 7;

FIG. 9 is an enlarged cross-sectional view of a curved tube (outer tube for injection).

FIG. 10 is a schematic view of an injection device with a double packer.

FIG. 11 is an enlarged half sectional view of the packer.

FIG. 12 is a diagram showing an example of forming a ground improvement body.

FIG. 13 is a diagram showing another example of formation.

FIG. 14 is a diagram showing another example of formation.

FIG. 15 is a view showing how to insert a propulsion pipe (outer pipe for injection) at a junction of a silud machine.

FIG. 16 is a diagram showing a state in which a propulsion pipe is embedded.

FIG. 17 is another buried state diagram of the propulsion pipe.

FIG. 18 is a sectional view of a ground improvement wall forming section.

FIG. 19 is a side view of a ground improvement wall forming section.

FIG. 20 is a schematic view of an injection device with a double packer used for a junction part of a Schild machine.

FIG. 21 is an explanatory view of a conventional ground improvement procedure for a junction part of a siludo machine.

FIG. 22 is an explanatory diagram of another ground improvement procedure of a conventional junction part of a siludo machine.

FIG. 23 is an explanatory view of a conventional ground improvement procedure of a shield tunnel widening portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rubber nozzle, 2 ... Nozzle holder, 3 ... Injecting device with double packer, 4A / 4B ... Packer, 5A / 5B ...
Packer sleeve rubber, 10 ... Shield tunnel, 1
2 ... propulsion device, 14 ... curved pipe, 17 ... guide pipe, 25 ... chain, 26 ... injectable hose, 27A / 27B ... packer water hose, 29/41 ... connecting holder, 29a ... injectant discharge port, 31 33: End tube, 35, 37: End bush, 39: Injectant feed pipe, 44: Inner pipe, 46, 50
... Shorted short pipe, 60 ... Drilling rig, 62 ... Oil motor, 6
4 ... Swing device, 66 ... Reducer, 68 ... Bit, 78 ...
Fiber optic gyro

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 390036504 Nippon Construction Co., Ltd. 8-14-14 Ginza, Chuo-ku, Tokyo (73) Patent holder 000115463 Light Industry Co., Ltd. 4-2-2 Kudankita, Chiyoda-ku, Tokyo No. 35 (73) Patent Holder 391023518 Japan Construction Machinery Association 3-5-8 Shiba Park, Minato-ku, Tokyo (Machine Promotion Hall) (72) Inventor Taro Kasutani 2-5, Misakicho, Chiyoda-ku, Tokyo -3 Inside Tekka Construction Corporation (72) Inventor Toshimasa Tanaka 2-5-3 Misakicho, Chiyoda-ku, Tokyo Inside Tekka Construction Corporation (72) Minoru Enomoto 1-1-16-15 Minamiikebukuro, Toshima-ku, Tokyo Seibu Ken (72) Inventor Kazutaka Murakami 1-6-17 Meguro, Meguro-ku, Tokyo Toneuchi, Inc. (72) Inventor Ban Nakaetsu 2-1-16, Kawaryamachi, Chuo-ku, Osaka-shi, Osaka (72) Inventor Minsei Fukaishi 2-1-16 Kawaraya-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Seikenai Co., Ltd. (72) Noboru Mikami 8-14-14, Ginza, Chuo-ku, Tokyo (72) Inventor Nobuyuki Fujisawa 4-2-5 Kudankita, Chiyoda-ku, Tokyo Light Industry Co., Ltd. (72) Inventor Tsukasa Adachi 6-10-12 Fujimidai, Fuji City, Shizuoka Prefecture (56 References JP-A-4-281991 (JP, A) JP-A-4-281990 (JP, A) Jikken 63-43235 (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9 / 06 301 E02D 3/12 101 E21D 9/04

Claims (2)

(57) [Claims] An injecting outer tube which is inserted into the ground and has a curved portion at least partially and a nozzle provided at a predetermined interval along a pipe axis direction on a pipe wall portion as an outer pipe for injection. An injection device with a double packer that is inserted into the outer tube for injection and performs ground injection while sealing the front and rear of a nozzle to be injected. End cylinders are respectively provided at intervals on the outer peripheral portion, a rubber sleeve for a packer is provided between these end cylinders, a feed pipe,
A liquid-tight inner space is formed by being partitioned by the both end cylindrical bodies and the rubber sleeve for the packer, and the rubber sleeve for the packer is configured to expand and contract by pressurizing and discharging the water for the packer to the inner space. A pair of short packers are arranged at intervals in the longitudinal direction, and these packers are connected by a chain. The tip of the one feed pipe faces between the packers, and discharges the ground filler through a discharge hole. A through hole is formed in the other supply pipe facing the inner space, and a flexible injection hose is connected to the supply pipe of the one packer so as to communicate with the supply pipe. A water hose connected to the inner space of the one packer and arranged in parallel with the infusate hose; and a water hose connected to a feed pipe of the other packer. Bend pipe Double-packer with the injection device. 2. An outer pipe for injection is a curved pipe inserted into the ground and having a curved portion at least in part and provided with nozzles at predetermined intervals along a pipe axis direction on a pipe wall portion. An injection device with a double packer that is inserted into the outer tube for injection and performs ground injection while sealing the front and rear of a nozzle to be injected. End cylinders are respectively provided at intervals on the outer peripheral portion, a rubber sleeve for a packer is provided between these end cylinders, a feed pipe,
A liquid-tight inner space is formed by being divided by both end cylindrical bodies and the rubber sleeve for the packer, and the rubber sleeve for the packer is configured to expand and contract by pressure-feeding and discharging water for the packer to the inner space. A pair of short packers are arranged at intervals in the longitudinal direction, and these packers are connected by a chain. The tip of the one feed pipe faces between the packers, and discharges the ground filler through a discharge hole. And a flexible injection hose is connected to the feed pipe of the one packer, and the injection hose is connected to the inner space of the one packer. A water hose arranged in parallel is connected, and the inner space of the one packer and the inner space of the other packer are connected by a flexible feeding hose, characterized in that: Da Rupakka with the injection device.