JPH0711863A - Method of ground improvement construction in shield excavation - Google Patents

Method of ground improvement construction in shield excavation

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Publication number
JPH0711863A
JPH0711863A JP15653593A JP15653593A JPH0711863A JP H0711863 A JPH0711863 A JP H0711863A JP 15653593 A JP15653593 A JP 15653593A JP 15653593 A JP15653593 A JP 15653593A JP H0711863 A JPH0711863 A JP H0711863A
Authority
JP
Japan
Prior art keywords
pipe
injection
ground
shield
excavation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP15653593A
Other languages
Japanese (ja)
Other versions
JP2770112B2 (en
Inventor
Keiji Adachi
Minoru Enomoto
Nobuyuki Fujisawa
Tamiyuki Fukaishi
Taro Kasuya
Noboru Mikami
Kazutaka Murakami
Ban Nakakoshi
Toshimasa Tanaka
登 三上
蕃 中越
徑治 安達
和隆 村上
実 榎本
民征 深石
利昌 田中
太郎 粕谷
伸行 藤沢
Original Assignee
Nippon Kensetsu Kikaika Kyokai
Nittoc Constr Co Ltd
Raito Kogyo Co Ltd
Seibu Kensetsu Kk
Seiken:Kk
Tekken Constr Co Ltd
Tone Corp
ライト工業株式会社
日特建設株式会社
株式会社利根
株式会社精研
社団法人日本建設機械化協会
西武建設株式会社
鉄建建設株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Kensetsu Kikaika Kyokai, Nittoc Constr Co Ltd, Raito Kogyo Co Ltd, Seibu Kensetsu Kk, Seiken:Kk, Tekken Constr Co Ltd, Tone Corp, ライト工業株式会社, 日特建設株式会社, 株式会社利根, 株式会社精研, 社団法人日本建設機械化協会, 西武建設株式会社, 鉄建建設株式会社 filed Critical Nippon Kensetsu Kikaika Kyokai
Priority to JP5156535A priority Critical patent/JP2770112B2/en
Publication of JPH0711863A publication Critical patent/JPH0711863A/en
Application granted granted Critical
Publication of JP2770112B2 publication Critical patent/JP2770112B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To conduct the ground improvement of the connecting section, etc., of a shielding machine properly and effectively, and to shorten the term of work. CONSTITUTION:Curved pipes 14, in which a plurality of rubber nozzles 1, 1... are installed at regular intervals along the longitudinal directions of the pipes, are inserted and mounted to the side section of a shield tunnel 10 in an arcuate manner. An impregnator 3 with double packers connected by chains 25 so that the packers 4A, 4B can correspond to the bending of the curved pipes 14 mutually is inserted into the curved pipes 14, the inside of the ground is impregnated with a ground impregnating agent through the rubber nozzles 1 under the state, in which each of the double packers 4A, 4B is positioned while successively crossing the rubber nozzles 1, and the ground of the periphery of a widening section F is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement method suitable for improving the ground around a shield tunnel, particularly in a joint of a shield machine, a widening part of a branch point, a widening part of a station part, and the like.

[0002]

2. Description of the Related Art Underground development has been actively conducted in recent years,
Construction of underground tunnels is increasing.

This underground tunnel is mainly constructed by a shield machine. However, when the excavation length is long, two shield machines are excavated from both sides of the planned joining point to join the shield machine in the ground. The ground between the shield machines is excavated and excavation for joining is performed manually. In addition, the shield tunnel may have to be partially widened at the branch of the route or the station.

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

In the freezing method, for example, as shown in FIG. 21, the shield machines 6 on both sides arrive at the planned joining point.
A large number of small holes are bored in a substantially annular shape from 1 and 63 to the planned joining points, and a large number of freezing tubes 5 are inserted in these small holes.
3, 53 ... Are buried in the periphery of the joint in an inclined state, a refrigerant is circulated through these freezing pipes 53, 53 ..., and the vicinity thereof including the planned joint point is completely frozen to form a frozen soil wall 55. After that, the inside is cut open and the joining work is performed.

23, the frozen soil block 69 is constructed by burying a large number of freezing pipes 68, 68 ... From the inside 67 of the shield tunnel toward the widened portion F, as shown in FIG. , The frozen soil block 69 is excavated to construct a widened portion.

[0007]

However, when improving the ground at the joint of the shield machine by the freezing method, it is necessary to perform the ground improvement work on both shield machines. Must wait for the other shield to arrive before carrying out the freezing work. Therefore, there is a problem that a longer construction period is required.

To cope with this, as shown in FIG. 22, a frozen soil wall 59 is preliminarily formed by burying a plurality of long frozen pipes 57, 57 ... Incliningly from a shield machine 61 that arrived first. Incidentally, although the method of waiting for the shield machine 63 that arrives later is also adopted, the shield machine 61 that arrives later has a large capacity in the frozen ground area, and water blocking / reinforcement of the ground on the shield that arrives later is not possible. Since it tends to be sufficient, a new auxiliary freeze pipe 6 may be added from the shield machine 63, which is installed later.
In some cases, the frozen soil wall may have to be constructed again by inserting 5, 65 ... As a result, the work period may not be shortened and the ground improvement effect from the early arrival shield machine 61 may not be sufficiently obtained.

Further, in the case of improving the ground of the widened portion by the freezing method, a large number of freezing pipes are required, cost and construction cost are spent, and the freezing pipe 68 left in the widening portion F interferes with the widening excavation. Therefore, there is a problem that excavation requires extra days and labor.

Therefore, in the present invention, the ground for shield machine excavation, which can effectively improve the ground such as the shield machine joining portion and the shield widening portion, can significantly shorten the construction period, and can reduce the construction cost. It provides an improved construction method.

[0011]

In order to solve the above-mentioned problems, the present invention is a ground improvement method which is applied to a shield machine joining portion when joining two shield machines that are opposed to each other. Then, the shield machine, which was previously stopped at the planned joining point, was equipped with a movable shoe at the tip and the barrel was bendable or curved, and a plurality of nozzles were provided on the pipe wall at predetermined intervals along the pipe longitudinal direction. The outer pipe for injection and the excavator equipped with a drive source at the tip of the inner pipe consisting of a bendable or bendable pipe and the tip bit of which can be swung are attached, and the excavator is inserted into the outer pipe for injection. It is arranged so that, from the side of the shield machine stopped ahead of this, the outer pipe for injection arrives at the outer peripheral part where the shield machine of the rear stop arrives along with the excavation by the rotation of the tip bit of the excavation device, and the direction of the shield excavation hole is approximately the same. parallel Or after being installed in a circular arc shape, the inner pipe is pulled out together with the excavator while the outer pipe for injection is left, and packers can cope with the bending of the outer pipe for injection in the outer pipe for injection. Flexible member,
Insert a chain member or an injection device with a double packer connected in a joint state, and sequentially position each of the double packers while straddling the nozzle of the injection outer pipe, and then insert the nozzle of the injection outer pipe. A ground improving agent is injected into the ground via the ground to improve the ground around the planned joining point.

Further, in the widened shield portion, a movable shoe is provided at the tip, the body portion is bendable or curved, and a plurality of nozzles are provided at predetermined intervals along the longitudinal direction of the pipe wall portion. The outer pipe for injection and the excavator equipped with a drive source at the tip of the inner pipe consisting of a bendable or curved pipe and the tip bit of which can be swung, and the excavator can be inserted into the outer pipe for injection. In the shield excavation hole, after the outer pipe for injection is inserted and installed in a curved shape around the widened portion with the excavation by rotation of the tip bit of the excavation device, the outer pipe for injection is left in a state of being left. Injection of the inner pipe together with a drilling device, and injection with a double packer into the outer pipe for injection, which is connected in a flexible member, a chain member or a smooth joint so that packers can cope with the bending of the outer pipe for injection. Equipment Injecting, sequentially, in a state where each of the double packer is positioned across the nozzle of the injection outer pipe, injecting a ground injection agent into the ground through the nozzle of the injection outer pipe, around the widened portion To improve the ground.

Further, between two shield excavation holes formed in parallel at a distance, the shield excavation hole is extended from one shield excavation hole to the other shield excavation hole, and each of the upper and lower portions of the widened portion is provided. Further, the outer pipe for injection may be inserted and installed in a curved shape, and the ground improvement between the two shield excavation holes may be performed according to the ground improvement method.

[0014]

According to the present invention, the outer injection pipe is inserted and installed in parallel with the tunnel direction or in an arc shape at the outer peripheral portion where the shield machine that has stopped first arrives at the planned joining point from the shield machine that has stopped first. To do. Also, in the case of the shield widened part,
The outer tube for injection is inserted and installed in a curved shape around the widened portion. Since all of these injection outer pipes have a curved portion or are installed in a curved shape as a whole, in the present invention, in particular, packers can cope with bending of the injection outer pipe. The ground improving agent is injected into the surrounding ground by using a flexible member, a chain member, or an injection device with a double packer connected in a joint state.

According to the above procedure, the shield machine joining portion and the widening portion are ground-improved, so that the injection outer pipe, which is installed in a curved shape around the ground improvement area, serves as an improvement core and is integrally solidified around the circumference. This makes it possible to form a strong solidified wall using the injection outer tube as a reinforcing material. Further, if necessary, increase the wall thickness of the injection outer pipe, or remove the double packer injection device after the completion of ground injection, by filling the inside of the injection outer pipe with concrete, solid You can create a wall.

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

Although a method of inserting a flexible freezing pipe into a pipe body installed in a curved shape to freeze the surrounding ground has already been disclosed, in the case of the freezing method, a refrigerant is circulated during the ground freezing period. Since it has to be continued, it is impossible to fill the buried pipe with concrete or the like and to improve the ground by limiting the improvement area as in the present invention.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. First, a case in which a widened portion is formed on a side portion of the shield tunnel 10 for branching a route will be described in detail as a first embodiment. FIG. 1 shows a state in which a curved pipe 14 serving as an injection outer pipe 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 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 on the lower end side of the mouth pipe 22. The curved pipe 14 is inserted into the water shutoff valve 28 and the water shutoff device 30, 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 shutoff valve 34, an inner pipe water shutoff device 36 and an inner pipe feed cylinder 38, which are shown by dotted lines in the figure.

The bent tube feed cylinder 32 is a bent tube 14
The curved pipe 14 can be sent out by extending the cylinder rod 40 which is connected to the propulsion device base at its end and is connected to the propulsion device base. Further, the inner pipe feed cylinder 38 is provided with a case 91 in an inner pipe 44 described later.
The inner tube 44 can be sent out in the direction of the arrow in the figure by extending the cylinder rod 42 that is connected via the cylinder rod 42 and whose end is connected to the original push case 90. The curved tube 14 is
As shown in FIG. 2, a large number of curved short pipes 46, 46 ... Are connected and configured. The short tube 46 is formed with a curvature that can surround the widened portion F in an arc shape. Similarly, the inner tube 44 is also formed of a large number of curved short tubes 50, 50 ... Connected to each other at their ends by pins 52, and has a curvature that allows insertion into the curved tube 14.

Further, as shown in FIG. 9, the rubber nozzles 1, 1 are provided at appropriate positions in the circumferential direction on the body portion of the curved pipe 14.
Is provided (it is omitted in FIGS. 1 to 8 for simplicity). In the rubber nozzle 1, for example, a circular hole 14a is formed in the pipe wall portion of the curved pipe 14, and this hole 1
4a, a nozzle holder 2 having a hat-shaped cross section and a nozzle hole 2a formed in the center is fitted and fixed by welding or the like, and a semicircular rubber plate 7, 7 is formed in a recess 2b of the nozzle holder 2. And the pressing ring 6 is screwed into and fixed to the recess 2b. The rubber nozzles 1 are provided at intervals of, for example, 2 to 4 nozzles / m in the pipe longitudinal direction.

The rubber nozzle 1 is provided at an arbitrary position in the circumferential direction. For example, when the rubber nozzles 1 are evenly arranged in the circumferential direction, as shown in FIG. A solid body G is created. Further, as shown in FIG. 13, when the rubber nozzle 1 is provided at one position in the circumferential direction, the rubber nozzle 1 is provided at the upper part of the curved pipe 14, and as shown in FIG. When 1, 1, ... Are provided, the solidified body G is formed in the upper part including the side part. In this way, by adjusting the mounting position of the rubber nozzle 1 to the curved pipe 14, it is possible to improve the ground while limiting the ground improvement range.

On the other hand, a cylindrical shoe 54 is attached to the tip of the curved pipe 14 as shown in FIG. The Shu 54
Since the hemispherical boss portion 56 formed on the rear end side is in sliding contact with the hemispherical groove 58 formed on the tip end side of the curved pipe 14, the hemispherical boss portion 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. 61-13 filed by the present applicant.
It has the same concept as the excavator disclosed in Japanese Patent Publication No. 7998.

That is, the excavator 60 comprises an oil motor 62, a swinging device 64, a speed reducer 66 and a bit 68. The oil motor 62 is the shield machine 1
From the oil pump (not shown) disposed inside
The hydraulic hose 70 wired to the above 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 includes
Four cylinder rods (only one is shown in FIG. 3) 7
2, 72 ... Are provided at equal intervals, and the expansion and contraction operations of these cylinder rods 72, 72 are performed by the shield machine 10 to the inner pipe 4
4 is remotely controlled by a hydraulic hose 73 wired in the unit 4. That is, by selecting these cylinder rods 72, 72 ... and extending them to the left in the figure, the movable device constituted by the speed reducer 66 and the bid 68 is moved, and at the same time, the aforementioned movable device is included. Shu 5
You can swing by making 4 follow.

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 the upper position in the figure, and when the flexible tube 74 and the movable shoe 54 are inserted, the expansion / contraction bit 74 contracts to the lower position in the figure so as not to hinder the insertion. It is urged by a urging means (not shown) so that the diameter is increased.

A plurality of guide ribs 77, 77 are provided between the curved pipe 14 and the inner pipe 44, and between the curved pipe 14 and the excavation device 60.
And the inner pipe 44 are held coaxially with the curved pipe 14. Further, a packer 77a is provided between the curved pipe 14 and the inner pipe 44, and the packer 77a is inflated when the inner pipe 44 is attached or detached, so that the shoe 54
Water is prevented from entering through the clearance between the excavator and the excavator 60.

An optical fiber gyro 78, which is a hole core measuring instrument, is provided in the inner tube 44 so as to be inserted therethrough. The optical fiber gyro 78 is mounted on a cable reel (not shown) via a cable 80 so as to be freely rewound, and is wound at a predetermined speed on the cable reel to measure the propulsion position of the bending tube 14. You can do it.

On the other hand, as an injection device for inserting the ground injection material into the curved pipe 14 as shown in FIG. 10, packers 4A, 4B which can be expanded by feeding water, for example, are used. A double-packer-equipped pouring device 3 connected by a chain 25 is used in order to adapt to the curvature of the curved pipe 14. In the ground injection, as shown in FIG. 10, the packer 4 is installed so as to straddle the rubber nozzle 1 to be injected.
Position A and 4B, and first send packer water to the packers 4A and 4B from water hoses 27A and 27B, respectively.
The rubber packers 5A and 5B of the packers 4A and 4B are bulged to be in contact with the inner wall of the curved pipe 14 until the packer is pushed out, and the ground improvement agent is fed from the injecting agent hose 26 to the connection holder 29. By injecting the ground injection material into the space between the packers 4A and 4B from the discharge hole 29a, the injection material is injected into the ground so as to spread the rubber nozzle 1.

The structure of the packers 4A and 4B will be described in detail with reference to FIG. 11. First, the packers 4A will be described.
Is that the rubber sleeve 5A for the packer of the body is held by the end cylinders 31 and 33. When the 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. The bulging curved tube 14 is configured to come into contact with the inner wall of the bulging curved tube 14 and seal. The end cylinder 31 is a ring-shaped metal article having a substantially U-shaped cross section,
An annular concave groove 31a into which the side edge of the rubber sleeve 5A is fitted is formed in the surrounding rising flange portion, and a plurality of saw-like projections 31b, 31b ... Are formed on one inner wall surface of the concave groove 31a. Has been formed. Further, a hole portion 31c for feeding packer water is formed in the end face portion, and the packer water hose 27A is formed in this hole portion 31c.
Are connected. Further, an end bush 35 is fitted in the central through hole. The end cylinder 33 on the other end side 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 ... Which mesh with the saw-like projections 31b ... 33b formed on the inner walls of the recessed grooves 31a, 33a, respectively, are formed. By engaging with each other, the rubber sleeve 5A does not easily come out even if the rubber sleeve 5A swells and pulls out.

A feed pipe 39 for the ground injecting agent is inserted into the center holes of the end bushes 35 and 37, and a connecting holder 29 is screwed on the side of the end bush 37 so that the end cylinder is The bodies 31, 33 are fixed. The left end 39a of the feeding pipe 39 in the drawing is threaded to connect the infusate hose 26.

By the way, the connection holder 29 and the connection holder 41 of the packer 4B are connected by a chain 25 so as to cope with the bending of the bending pipe 14, but this connection has a small bending rigidity, for example. It may be connected by a flexible shaft having flexibility, a wire or a joint having a smooth joint structure such as a universal joint.

On the other hand, the packer 4B is basically constructed in the same manner as the packer 4A, but since it is not necessary to feed the infusate, the feeding pipe 4 for connecting the end bush pipes on both sides.
3 is used as a packer water passage, the packer water is fed from the intermediate through hole 43a into the packer 4B, and the rubber sleeve 5B is inflated.

Next, a procedure for improving the ground of the widened portion of the shield tunnel by the ground improving apparatus configured as described above will be described. First, as shown in FIG.
The upper portion of the segment 16 is opened, and the mouth pipe 22 is connected to the opening 20. Next, the curved short pipe 4 is attached to the mouth pipe 22.
The propulsion device 12 is inserted through the curved pipe 14 in which 6, 6, ...
It is sent out sequentially by the inner pipe 4
4 is inserted and sequentially sent out by the propulsion device 12. 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 curved pipe 14
The excavator 60 attached to the inner pipe 44 excavates the ground so as to surround the widened portion F in an arc shape as shown in FIG.

However, the curved pipe 14 does not always propel in the direction in which it encloses the widened portion F 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 curved pipe 14 is
The excavation device 60 is stopped at the time when the excavation and insertion is performed up to a position surrounding the widened portion F in an arc shape, and the inner pipe 44 is excavated by the excavation device 60.
At the same time, pull out from the curved pipe 14. As a result, the curved pipe 14
Are embedded so as to surround the widened portion F. And FIG.
0, the double packer-equipped injection device 3 shown in FIG. 11 is inserted into the curved pipe 14, and the double packers 4A and 4B are sequentially positioned while straddling the rubber nozzle 1 of the curved pipe 14. By injecting the ground injection agent between the packers 4A and 4B, the rubber nozzles 1, 1
The ground injection agent is injected into the ground through the ... to improve the ground around the curved pipe 14. The injection device 3 with the double packer can be moved by pushing and pulling the water hose 27A, 27B for packer and the hose 26 for infusate which are inserted from the opening portions at both ends of the curved pipe 14. Also,
The position adjustment can be performed by measuring the feeding length of the hoses.

In this manner, the propulsion device 12 is sequentially moved along the widened portion F in the shield tunnel 10 in this manner so that the plurality of curved pipes 14 and 14 are expanded as shown in FIG.
They are embedded in parallel at a constant interval so as to surround the entire circumference of. Then, the injection device 3 with the double packer is sequentially inserted into each of the curved pipes 14, 14 ...
The solidified wall 82 indicated by is formed to improve the surrounding ground. Also,
If necessary, after the pouring is completed, the pouring device 3 with double packer is removed, and the curved pipe 14 is filled with concrete, whereby a strong 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 solidified wall 82 is sufficiently hardened. Therefore,
Since the ground of the widened portion F is protected by the improved solidified wall 82 around the ground, it is possible to prevent a disaster such as collapse due to excavation and water discharge, and it is possible to easily widen the ground compared to the conventional widening construction 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 consolidation wall 82 is formed in an arc shape. Compared with the widening construction method described in (1), the ground in the widening portion can be effectively improved, 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 shield tunnels 10 and 11 excavated adjacently, either one of the shield tunnels 10 and 11 (this embodiment Then, the curved pipes 14 and 15 from the shield tunnel 10) may be embedded around the widened portion F by the procedure described above to form the solidified wall 82.

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

By the way, FIG. 7 and FIG. 8 show another example of the curved pipe according to the present invention. The curved pipe 84 is configured by connecting a plurality of straight tubular short pipe units 85, 85 ....
The short pipe unit 85 is formed with steps having large and small inner diameters and outer diameters, and is connected to the large inner diameter portion 85a.
The small outer diameter portion 85b is inserted with a movable gap 86.
A packing 87 is attached to the small outer diameter portion 85b.
The packing 87 is embedded in the groove 83 formed in the peripheral portion of the small outer diameter portion 85b, and the outer peripheral portion thereof is in sliding contact with the large inner diameter portion 85a to prevent water from entering from the outside.

The short pipe units 85, 85 are connected by a pin 88 so as to be bendable 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 pipe 84 is configured so as to bend 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, like the curved pipe 84, the entire inner pipe 92 is configured to bend with a small curvature.

Therefore, according to the present modification, even if the curved pipe 84 and the inner pipe 92 are connected by a straight tubular short pipe so as to be bendable, a predetermined amount is obtained by following the excavation device which is advanced while the direction is corrected by the optical fiber cable. Can be propulsion placed in the position. Thereby, even in the case of this modification, the effect of the first embodiment can be obtained.

Next, as a second embodiment, the joint portion 24 of the shield tunnel is manufactured by the ground improvement device according to the present invention.
A detailed description will be given of the case of improving the ground. In FIG. 15, inside the shield machine 21, the drive device and the like of the shield machine main body are already removed, and a ground improvement device for joining is arranged. A plurality of openings 96, 96 ... Are formed at predetermined intervals on the inner peripheral portion of the shield machine 21, and a mouth pipe 95 is provided in each of the openings 96, 96.
It is fixed to the inside of 1 with a predetermined inclination. A water shutoff valve 97 and a water shutoff device 97a of the guide pipe 17, which will be described later, are connected to the end of the mouth pipe 95. Also, the water stop device 9
A water shutoff valve 98 of the propulsion pipe 23 and a water shutoff device 98 a are provided in the subsequent stage of the No. 7.

The propulsion pipe 23 is inserted through the water shutoff valves 97, 98 and the water shutoff devices 97a, 98a, and the propulsion pipe 23 is sent out by the pushing device 51 in the direction shown by the arrow in the figure. The extruding device 51 includes a propelling pipe feeding cylinder 51a and an inner pipe feeding cylinder 51.
b, the propulsion pipe 23 is sent out in the direction of the arrow in the figure by the propulsion pipe feed cylinder 51a, and the inner pipe 94 described below is sent by the inner pipe feed cylinder 51b. Further, in the vicinity of the extrusion device 51, an inner pipe 94
A water shutoff valve 93 and a water shutoff device 93a are provided.

A guide pipe 17 is fitted in the mouth pipe 95, and the guide pipe 17 is embedded along the mouth pipe 95 in an inclined state. In addition, in the guide pipe 17, a guide guide hole 1 for guiding the propulsion pipe 23 toward the planned joining point 24 direction.
7a is formed. As the propelling pipe 23, a large number of straight tubular short pipe units 85, 85, ... As shown in FIG. 7 are connected and the whole is made to bend with a small curvature. Other than that, the tip structure of the propulsion pipe 23, the excavation device 60 inside thereof, and the like are the same as in the case of the first embodiment.

An inner pipe 94 is inserted and disposed in the propulsion pipe 23. The inner pipe 94 has the same structure as that of the propulsion pipe 23, and a description thereof will be omitted.
Therefore, as a whole, both the propulsion pipe 23 and the inner pipe 94 are configured so as to bend with a small curvature. 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 where is provided.

In the ground improvement of the shield tunnel joint portion by such an apparatus, first, as shown in FIG. 16, two shield machines 21, 13 are to be joined at a planned joining point 24.
Dig from both sides of. Next, the water shutoff valve 97 attached to the mouth pipe 95 shown in FIG. 1 of the shield machine 21 that has stopped before the planned joining point 24 is opened, and the guide pipe 17 is excavated from the shield machine 21 in the inclined direction to open the mouth pipe. Fix at 95. Then, the propulsion pipe 23 is sent out by the pushing device 51.
The propulsion pipe 23 and the inner pipe 94 are changed in direction along the guide guide hole 17a of the guide pipe 17, and the propulsion pipe 23 and the excavator 6 are
0 digs the ground toward the rear stop shield machine 13 side substantially parallel to the digging direction.

Next, the propulsion pipe 23 is connected to the planned joining point 2
The excavation device 60 is stopped when the excavation is inserted to a predetermined position sufficiently exceeding 4, and the inner pipe 94 is pulled out from the propulsion pipe 23 together with the excavation device 60. By this, the propulsion pipe 23
Is buried above the planned joining point 24 substantially parallel to the excavation direction of the shield machine 21.

Incidentally, without using the guide tube 17,
The propulsion tube 23 can be excavated 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 pushing device 51 is sequentially moved in this manner to move the plurality of propulsion pipes 23, 12 ...
As shown in FIG. 9, the shield machine 13 is buried along the outer shape of the shield machine 13 which is to be stopped around the planned joining point 24 at a constant interval substantially in parallel with the shield excavation direction (in this case, it is substantially annular).

When the burying of the propulsion pipe 23 is completed by the above 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 tube 23 by the above procedure. To form a solidified wall 82. Here, in the case of the shield machine joint portion of the present embodiment, the tip end portion of the propulsion pipe 23 is buried in the ground, and therefore, as shown in FIG.
It is not possible to adopt the method shown in FIG. 0 for supplying packer water from both sides to each of the packers 4A and 4B. Therefore, as shown in FIG.
An injection device 3'with a double packer in which A and the packer 4B are connected by a flexible feed hose 71 so that the packer water supplied from the packer 4A side is also supplied to the packer 4B on the tip side. I am using. The movement of this double packer-equipped injecting device 3'is performed by using a relatively rigid large-diameter hose as the injecting agent hose 26 and pushing and pulling this, but in the case of extrusion, the packer 4A's The contact between the connection holder 29 and the connection holder 41 of the packer 4B pushes the packer 4B on the front end side forward. Further, the position adjustment in the propulsion pipe 23 can be performed by measuring the payout length of the infusate hose 26.

Then, at the timing when the solidifying wall 82 is sufficiently formed, the post-stop shield machine 1 is placed in the solidifying wall 82.
3 is dug to approach the front of the shield machine 21 that has stopped first. Therefore, since the ground having a small thickness between the shield machines is protected by the improved solidified wall around the ground, it is possible to prevent a disaster such as a collapse due to excavation and a flood. This allows the shield machines to be joined together.

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

[0058]

As described above in detail, according to the present invention, it is possible to appropriately and effectively improve the ground such as the shield machine joint portion and the shield tunnel widening portion, and it is possible to significantly shorten the construction period. Moreover, the construction cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a first part of a shield drilling hole widening device according to the present invention.
It is explanatory drawing which shows 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 for widening a tunnel by the shield excavation hole widening method according to the present invention.

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

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

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

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

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

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

FIG. 11 is an enlarged view of a half section of the packer.

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

FIG. 13 is a diagram showing another construction example.

FIG. 14 is a diagram showing another construction example.

FIG. 15 is a diagram showing how to insert the propulsion pipe (outer pipe for injection) into the shield machine joint.

FIG. 16 is a view showing an embedded state of the propulsion pipe.

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

FIG. 18 is a cross-sectional view of a ground improvement wall creation part.

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

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

FIG. 21 is an explanatory diagram of a ground improvement procedure of a conventional shield machine joint portion.

FIG. 22 is an explanatory diagram of another ground improvement procedure of a conventional shield machine joint.

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

[Explanation of symbols]

1 ... rubber nozzle, 2 ... nozzle holder, 3 ... injection device with double packer, 4A / 4B ... packer, 5A / 5B ...
Packer sleeve rubber, 10 ... Shield tunnel, 1
2 ... Propulsion device, 14 ... Bent pipe, 17 ... Guide pipe, 25 ... Chain, 26 ... Injectant hose, 27A / 27B ... Packer water hose, 29/41 ... Connection holder, 29a ... Injectant discharge port, 31 ... 33 ... End cylinder, 35/37 ... End bush, 39 ... Injecting agent delivery pipe, 44 ... Inner pipe, 46.50
... Short-shaped curved pipe, 60 ... Drilling equipment, 62 ... Oil motor, 6
4 ... Swinging device, 66 ... Reducer, 68 ... Bit, 78 ...
Fiber optic gyro

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 390036504 8-14-14 Ginza, Chuo-ku, Tokyo Nittoku Construction Co., Ltd. (71) Applicant 000115463 Light Industry Co., Ltd. 4-2-135, Kudankita, Chiyoda-ku, Tokyo No. (71) Applicant 391023518 Japan Construction Mechanization Association 3-5-8 Shiba Park, Minato-ku, Tokyo (Mechanical Promotion Center) (72) Inventor Taro Kasuya 2-5-3 Misakicho, Chiyoda-ku, Tokyo Incorporated Co., Ltd. (72) Inventor Toshimasa Tanaka 2-5-3 Misaki-cho, Chiyoda-ku, Tokyo Iron Construction Co., Ltd. (72) Minor Enomoto 1-16-15 Minamiikebukuro, Toshima-ku, Tokyo Seibu Construction Co., Ltd. (72) Inventor Kazutaka Murakami 1-6-17 Meguro, Meguro-ku, Tokyo Tone Co., Ltd. (72) Inventor Satoshi Nakaetsu 2-11-16 Kawarayacho, Chuo-ku, Osaka-shi, Osaka Seikennai (72) Inventor Minsei Fukaishi 2-11-16 Kawaramachi, Chuo-ku, Osaka-shi, Osaka Stock company Seiken (72) Inventor Noboru Mikami 8-14-14 Ginza, Chuo-ku, Tokyo Special Construction Co., Ltd. (72) Inventor Nobuyuki Fujisawa 4th-35, Kudankita, Chiyoda-ku, Tokyo Light Industrial Co., Ltd. (72) Yuuji Adachi 6-10-12 Fujimidai, Fuji City, Shizuoka Prefecture

Claims (5)

    [Claims]
  1. Claim: What is claimed is: 1. A ground improvement method applied to a shield machine joining portion when joining two shield machines that face each other, the tip of the shield machine being stopped at the planned joining point first. An outer injection tube having a movable shoe and a barrel that is bendable or bent, and a plurality of nozzles are provided in the tube wall portion at predetermined intervals along the tube longitudinal direction; and a bendable or bent tube An excavator equipped with a drive source at the tip of the inner pipe and a tip bit that can be swung is installed, and this excavator is arranged so that it can be inserted into the injection outer pipe. When the outer pipe for injection arrives at the outer peripheral portion where the shield machine of the post-stop arrives along with the excavation due to the rotation of the tip bit of the device, the injection is performed after being installed substantially parallel to the excavation direction of the shield drilling hole or in an arc shape. Overuse While pulling out the inner pipe together with the excavation device, the packer is connected in a flexible member, a chain member or a smooth joint so that the packers can cope with the bending of the outer pipe for injection. Insert the injection device with double packer,
    Sequentially, with each of the double packers positioned across the nozzle of the injection outer pipe, injecting a ground improvement agent into the ground through the nozzle of the injection outer pipe, the ground around the planned joining point Ground improvement method in shield excavation characterized by improvement.
  2. 2. A ground improvement method applied to a widened portion of a shield drilling hole when the shield drilling hole is widened, wherein a movable shoe is provided at the tip and the body is bendable or curved. An injection outer tube having a plurality of nozzles provided at predetermined intervals in the tube wall along the longitudinal direction of the tube, and a drive source at the tip of the inner tube made of a bendable or bendable tube, and the tip bit can swing. Along with mounting a drilling device, this drilling device is arranged so that it can be inserted into the outer pipe for injection, and the outer pipe for injection is surrounded by the rotation of the tip bit of the excavating device from the inside of the shield drilling hole around the widened portion. After being inserted and installed in a curved shape, the inner pipe is pulled out together with the excavating device while leaving the outer pipe for injection, and the packers can cope with the bending of the outer pipe for injection in the outer pipe for injection. Flexible part By inserting a double packer with injection device coupled with a chain member or synovial node status,
    Sequentially, with each of the double packers positioned across the nozzle of the injection outer pipe, injecting a ground injection agent into the ground through the nozzle of the injection outer pipe, improving the ground around the widened portion A ground improvement method for shield excavation, which is characterized by:
  3. 3. Between two shield excavation holes formed in parallel at intervals, one shield excavation hole is extended from the other shield excavation hole to the other shield excavation hole, and each of the upper and lower portions of the widened portion is provided. A ground improvement method in shield excavation, wherein the outer pipe for injection is inserted and installed in a curved shape, and the ground between the two shield excavation holes is improved according to the method of claim 2.
  4. 4. After the completion of ground injection by the double packer injection device, the double packer injection device is removed,
    The ground improvement method for shield excavation according to claim 1, wherein the outer pipe for injection is filled with grout material.
  5. 5. The injection is performed while limiting the formation range of the ground improvement body by defining the circumferential mounting position of the nozzle provided on the wall portion of the injection outer pipe.
    Ground improvement method in shield excavation described in 4.
JP5156535A 1993-06-28 1993-06-28 Ground improvement method in shield excavation Expired - Lifetime JP2770112B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5156535A JP2770112B2 (en) 1993-06-28 1993-06-28 Ground improvement method in shield excavation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5156535A JP2770112B2 (en) 1993-06-28 1993-06-28 Ground improvement method in shield excavation

Publications (2)

Publication Number Publication Date
JPH0711863A true JPH0711863A (en) 1995-01-13
JP2770112B2 JP2770112B2 (en) 1998-06-25

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006112065A (en) * 2004-10-13 2006-04-27 Taisei Corp Element pipe, bulkhead, and construction method for bulkhead
JP2006283290A (en) * 2005-03-31 2006-10-19 Raito Kogyo Co Ltd Soil improving method
JP2009114769A (en) * 2007-11-08 2009-05-28 Kajima Corp Water leakage part-freezing device and water stopping method of water leakage part

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6343235U (en) * 1986-09-05 1988-03-23
JPH04281991A (en) * 1991-02-16 1992-10-07 Seiken:Kk Method and apparatus for improving ground for connecting shield machine
JPH04281990A (en) * 1991-02-18 1992-10-07 Seiken:Kk Method and apparatus for expanding pit width by shield excavator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6343235U (en) * 1986-09-05 1988-03-23
JPH04281991A (en) * 1991-02-16 1992-10-07 Seiken:Kk Method and apparatus for improving ground for connecting shield machine
JPH04281990A (en) * 1991-02-18 1992-10-07 Seiken:Kk Method and apparatus for expanding pit width by shield excavator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006112065A (en) * 2004-10-13 2006-04-27 Taisei Corp Element pipe, bulkhead, and construction method for bulkhead
JP4536476B2 (en) * 2004-10-13 2010-09-01 大成建設株式会社 Bulkhead and construction method of bulkhead
JP2006283290A (en) * 2005-03-31 2006-10-19 Raito Kogyo Co Ltd Soil improving method
JP2009114769A (en) * 2007-11-08 2009-05-28 Kajima Corp Water leakage part-freezing device and water stopping method of water leakage part

Also Published As

Publication number Publication date
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