JPH02144494A - Underground joining method and underground joining equipment for shield tunnels - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" This invention is a shield tunnel in which one tunnel is excavated from both ends of the tunnel using two shield machines, and the tunnels are joined in the middle. This article relates to underground bonding methods and underground bonding equipment.

"Conventional technology" In recent years, in order to shorten the construction period of the shield construction method for excavating tunnels in soft ground, starting shafts are excavated at positions corresponding to both ends of the tunnel to be constructed, and from these starting shafts A tunnel is excavated using two shield machines, and the tunnel is completed by joining them in the middle.
A method called underground bonding method has been proposed and implemented.

FIG. 11 is a diagram showing the conventional underground bonding method.

In the figure, reference numeral G indicates the ground near the joint of the shield tunnel excavated from both ends, and within this ground G, the shield machine 1 that excavated one tunnel Ta on the right side of the paper, On the left side, the shield machine 2 that excavated the other tunnel Tb faces each other, leaving a ground Gi at a predetermined interval (about 30 cm). At the front of these shield machines 1.2, there is a canter device 5a for earth excavation.

5b is provided. The wall surfaces of the tunnels Ta and Tb formed behind the shield machine 1.2 are segments 3a-, 3a%...3b13b,.
The lining is being carried out by... In addition, at the tip of the shield machine 1.2, holes are drilled at a predetermined angle of inclination (σ-17° to 25e) with respect to the skin plates la and 2a, and at a predetermined pitch in the circumferential direction toward the ground G. Freezing tubes 4a, 41
) are installed, the skin plates 1a and 2
Freezer tubes (as shown) are installed on the inner peripheral surfaces of the tubes 3a and 3b.

And, the perforation type freezing 'F? For 4a, 4b and pasting, brine is circulated in the freezing tube (skin brake is applied to surround the ground G1ff). After freezing the ground Gf on the outer periphery of 1a and 2a, After dismantling the devices 5a and 5b, the ground G left between the shield machines 1 and 2 is removed.
By excavating tunnel i and lining its wall surface, the tunnels Ta and Tb, which have been excavated from the left and right, are joined together to complete the shield tunnel.

[Problems to be Solved by the Invention] However, since the conventional rotor machines 1 and 2 are provided with the cutter device 5a s 5b at the front thereof, the above-mentioned underground joint During construction, it is impossible to bring both shielding machines 1.2 close together until these cutter devices 5a and 5b come into contact with each other, and because they are normally oriented relative to each other with a gap of about 30 cm left,
It is difficult to say that water stopping and earth retention are perfect, and there are safety issues.Furthermore, the freezing method, which is mainly used as an auxiliary construction method, requires a lot of construction cost and construction time, and it is difficult to do so under the seabed. There were problems such as the introduction of salt during construction, which reduced the strength of the frozen soil, the expansion of frozen soil during freezing, and the effects of ground subsidence during thawing, and the difficulty of managing frozen soil.

This invention was made in view of the above-mentioned circumstances, and ensures sealing and water stoppage against earth water pressure acting from the ground near the tunnel joint to the joint, making it possible to perform construction safely. The purpose of the present invention is to provide an underground bonding method and underground bonding device for shield tunnels that can significantly reduce the construction cost and construction period required for tunnel bonding.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following means.

That is, the invention according to the first claim uses two shield machines that propel underground while excavating the ground with a cutter device installed at the front and assembling segments for the primary lining inside. , a shield tunnel underground joining method in which the tunnel is completed by excavating tunnels from both ends of the tunnel to be constructed and joining them midway, is characterized by having the following steps: shall be.

(1) The tip of the skin plate is formed double by an outer cylinder and an inner cylinder, and a penetrating ring is stored between the outer cylinder and the inner cylinder, and the cutter device is connected to the inner cylinder. A first shield machine configured to be freely stored inside;
A second shielding device, in which the tip of the skin plate is double formed by an outer cylinder and an inner cylinder having the same diameter as the first shielding machine, and the cutter device is configured to be freely stored inside the inner cylinder. (11) Immediately before the end of this tunnel excavation process, while storing the cutter devices of the first and second shield machines in their respective inner cylinders, By advancing one of the shield machines and sliding the penetrating ring of the first shield machine forward along the axis of this shield machine, the penetrating ring causes the first and second shield machines to move forward. (iii) After this step, the skin plates of the first and second shield machines are left in place, and the shield machines are dismantled to cover the ground at the tunnel joint that is left behind. A step of excavating the ground and further placing concrete on the inner surface of the skin plate to line the wall surface of the joint.

Further, the invention according to the second claim is such that while excavating the ground with a cutter device provided at the front part and assembling segments for the primary lining inside, the tips of the segments are turned with a shield jack. Using two S-shield machines that propel underground by applying force, tunnels are created from both ends of the tunnel to be constructed. In the bonding device 1, the skin y' of the one shield machine 1. = -1- has a double tip formed by an outer cylinder and an inner height, and a penetrating ring that is movable in the oil immersion direction of the shield machine is housed between the outer cylinder and the inner cylinder of this shield machine. and a penetration chamber into which the penetration ring is penetrated is formed by forming the tip of the skin plate of the other shield machine in double form with an outer cylinder and an inner cylinder having the same diameter as the one shield machine. Furthermore, the cutter device of each shield machine is configured to be able to be stored inside one of the inner cylinders in a skip by a moving means, and the cutter device moving means and the shield jack are synchronized with each of these shield machines. The invention is characterized in that it is provided with a control means for driving the motor.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 are diagrams showing an underground connecting device for a shield tunnel, which is an embodiment of the present invention.

In the figure, the symbol G is the ground near the junction of the shield tunnel that has been excavated from both ends, and within this ground G,
First shield 11! io cuts the tunnel Ta from the right side to the left side by the cutter device 11 provided at the front part.
Further, the second shield machine 40 is excavating the other tunnel Tb from the left side to the right side using a cutter device 41 provided at the front part of the second shield machine 40. Then, the wall surface of the tunnel Ta formed behind the first shield machine 10 is primarily lined with segments 12, 12, . . . assembled inside this shield machine 10, and similarly,
Tunnel Tb formed behind the second shield machine 40
The wall surface of the shield machine 40 is primarily lined with segments 42, 42, . . . assembled inside the shield machine 40. In the above configuration, the first shield a
The lO and the second shield machine 40 constitute an underground joining device that excavates tunnels Ta and Tb from both ends of a tunnel to be constructed, respectively, and joins them in the middle.

The tip of the cylindrical skin plate 13 forming the outer shell of the first rolled machine 10 has an outer cylinder 14 formed to have the same diameter as this skin plate 13 and an inner cylinder formed to have a smaller diameter than this outer cylinder 14. The inner cylinder 15 is connected to the skin plate 13 by a hollow annular partition plate 17 formed perpendicular to the axis of the skin plate 13. .These outer cylinders 14
A penetration ring 16 made of a cylindrical iron plate is housed between the inner cylinder 15 and the inner cylinder 15 .

In addition, an annular reaction plate 19 is attached to the inner surface of the intermediate portion of the skin plate 13 of the first shield machine 10, and an extrusion plate 19 for extruding the penetrating ring 16 is attached to the front surface of the reaction plate 19. A plurality of jacks 20 (in the illustrated example, only one jack is shown) are attached at intervals in the circumferential direction. The jack rod 21 of the extrusion jack 20 passes through the partition plate 17 and extends forward along the axis of the skin plate 13, and its tip is attached to the rear end of the penetration ring 16.

Furthermore, sealing materials 37, 37, such as lip seals, are provided on the inner circumferential surface of the outer cylinder 14 and the outer circumferential surface of the inner cylinder 15 so as to sandwich the penetrating ring 16 from both sides thereof. With this configuration, the penetrating ring 16 is configured to be slidable in the front-rear direction along the axis of the skin plate 13.

On the inner surface of the partition plate 17, a cylindrical mounting tube 18 is attached coaxially with the skin plate 13, and on the inner peripheral surface of the mounting tube 18, a bottomed cylindrical tube with a slightly smaller diameter is attached. A supporting portion 23 is fitted therein. This support part 2
3 is composed of a cylindrical sliding tube 24 and a partition plate 25 that closes off the front end of the sliding tube 24. On the inner circumferential surface of the mounting tube 18, there are sliding bearings 38, 38 and lip seals interposed between the mounting tube 18 and the sliding tube 24,
A sealing material 37.37 such as a U-seal or an O-ring is provided. And, between the partition plate 25 and the erector device 33 for segment assembly provided on the shield machine 10fi side, there is a Kantha slide jack (for moving the sliding tube 24).
A canter device moving means) 34 is interposed, so that the support portion 23 is configured to be movable in the front-rear direction along the axis of the skin plate 13. Also, in the figure, reference numeral 3
6 is a hatch provided at the center of the partition plate 25 that can be opened and closed.

On the other hand, the cutter device 11 of the first shield machine 10 is
This partition plate 2 is formed to have a smaller diameter than the partition plate 25 of the support part 23, and is arranged in a concentric circle with the skin play 1-13.
A support drum 26 pivotally supported by
eight spokes 27.27 fixed to the tip and extending radially from the axis of the skin plate 13 in its radial direction;
It is roughly composed of...

These spokes 27, 27, . . . are formed so that the diameter of a circle passing through their tips is slightly smaller than the inner diameter of the inner cylinder 15. A cutting blade 28 is provided on the front of the spoke 27.
．． A large number of 28, . . . are arranged. Moreover, a tip blade 29 is stored inside every other spoke 27 among the spokes 27, 27, . An extension/contraction mechanism 30 consisting of a jack or the like is attached which allows the spokes 27 to be retracted and exposed inside and out.

Further, the support drum 26 has a bearing 3 on the partition plate 25.
1. Further, a drive mechanism 32 such as a hydraulic motor that engages with the rear end of the support drum 26 and rotationally drives the support drum 2G is attached to the inner circumferential surface of the sliding tube 24, thereby controlling the entire cutter device 11. is rotated around the axis of the skin plate 13 as a central axis.

On the other hand, the second shield machine 40 has the same general configuration as the first shield machine 10, and the tip of the skin plate 43 is a cylindrical outer tube having the same diameter as the first shield 1110. 44 and an inner cylinder 45. The inner cylinder 45 is connected by a hollow annular partition plate 47 formed perpendicular to the axis of the skin plate 43. A space surrounded by the outer cylinder 44, inner cylinder 45, and partition plate 47 is a penetration chamber 46 into which the penetration ring 16 of the first shield machine 1O is penetrated.

A protective ring 52 having a thickness slightly thinner than the distance between the outer cylinder 44 and the inner cylinder 45 is fitted into the penetration chamber 46 . An inclined surface 52a that slopes backward toward the center of the shielding machine 2 is formed on the front surface of the protective ring 52, thereby increasing the pressure on the penetrating ring 16 and smoothly taking in excavated earth and sand. It is planned.

Further, an annular reaction plate 49 is attached to the inner surface of the intermediate portion of the skin plate 43 of the second shield machine 40, and a retraction plate for retracting the protection ring 52 is attached to the front surface of the reaction plate 49. A plurality of jacks 50 (in the illustrated example, only one jack is shown) are attached at intervals in the circumferential direction. The jack rod 51 of the retractable jack 50 passes through the partition plate 47 and extends forward along the axis of the skin plate 43, and its tip is attached to the rear end of the protective ring 52. In addition, sealing materials 37, 37, such as Z-peals, are provided on the inner circumferential surface of the outer cylinder 44 and the outer circumferential surface of the inner cylinder 45, so that the protective ring 5
With the above structure, the protective ring 52 is configured to be slidable in the front-rear direction along the axis of the skin plate 43.

The inner surface of the partition plate 47 is provided with the first shield v&l.
Similarly to O, a cylindrical mounting tube 48 is attached to the skin plate 4.
3 and coaxially with this mounting tube 4.
A bottomed cylindrical support portion 53 having a slightly smaller diameter is fitted into the inner peripheral surface of the support portion 8 .

Like the support part 23, this support part 53 is composed of a cylindrical sliding R54 and a partition plate 55. The inner peripheral surface of the mounting tube 48 is provided with a slide bearing 38, 38 and a ring material 37, 37 such as a lip seal, a U seal, an O-ring, etc. Then, the partition plate 55 and the shield machine 4
A cutter slide jack (cutter device moving means) 64 for moving the sliding tube 54 is interposed between the support section 53 and the erector device 63 provided at the rear.
is configured to be freely movable in the front-rear direction along the axis of the skin plate 43. Further, in the figure, reference numeral 66 is a hatch provided at the center of the partition plate 55 that can be opened and closed.

On the other hand, the cutter device 41 is connected to the first shield machine 1.
Similar to the cutter device 11 of No. 0, the support drum 56 is pivotally supported by the partition plate 55 of the support section 53, and the support drum 5
Eight spokes 57.57 are fixed to the tip of the skin plate 43 and extend radially from the axis of the skin plate 43 in the radial direction thereof.
, . . .

Like the spokes 27 of the first rolled machine 10, these spokes 57, 57, . . The front surface of the spoke 57 has a cutting blade 58.
A large number of 58, . . . are arranged. Also, spoke 5
7. Among the spokes 57, every other spokes 57 are housed with tip blades 59, and the tip blades 59 are expanded and contracted in the radial direction of the shield machine 40 to attach spokes. An extension/contraction mechanism 60 consisting of a jack or the like is attached to store and expose the inside and outside of 57.

Further, the support drum 56 has a bearing 6 on the partition plate 55.
1, and a drive mechanism 62 such as a hydraulic motor that engages with the rear end of the support drum 56 and rotationally drives the support drum 56 is attached to the inner peripheral surface of the sliding cylinder 54. As a result, the entire cutter device 41 is driven to rotate about the axis of the skin plate 43 as a central axis.

In addition, in the figure, numerals 35 and 65 respectively indicate the shield machine 1
A shield jack is provided at intervals in the circumferential direction on the rear surface of the partition plate 17.47 of 0.40, and is used to propel the shield machine 10.40 forward by taking a reaction force at the tip of the segment 12.42; Reference numerals 39 and 69 indicate tail packings that are provided on the inner surface of the rear end portion of the shield machine 10, 400 skin plate 1-13, and 43, respectively, and close the gap between the segment 12.42 and the skin plate 13.43. . .

Furthermore, each of these shield machines 10 and 40 is provided with a hydraulic mechanism (as shown in FIGS. 1 to 4) that drives the cutter slide jacks 34 and 64 and the shield jacks 35 and 65. There is.

This hydraulic mechanism has a configuration as shown in FIG. In addition, the hydraulic PIi structure has the first and second shield machines 10.40
The hydraulic mechanism installed in the second shield machine 40 will be described below since it has a common configuration.

In this figure, the cutter slide jack 64 and the shield jack 65 are connected to the second shield machine 40 as described above.
The explanation is omitted. The code 70.71 is an oil tank, and the code 72.73 is an oil tank 70.
．． This is a hydraulic pump for supplying pressure oil from 71 to the cutter slide jack 64 and shield jack 65.

Furthermore, electromagnetic valves (4-bottom, 3-position switching open center type) 74,75 are interposed between the hydraulic pumps 72, 73, the cutter slide jack 64, and the shield jack 65. Here, the solenoid valve 74 is for changing the operating direction of the cutter slide jack 34,
The solenoid valve 75 changes the operating direction of the shield jack 35.

Further, each of the cutter slide jack 64 and the shield jack 65 is provided with stroke detectors 76 and 77 for detecting their strokes. These tests
The signals C5 and JS from the fj unit 76 and 77 are sent to the sequencer (
control means) 78. The sequencer 7β has a function of synchronizing and driving the cutter slide jack 64 and the shield jack 65, and issues operation commands to the electromagnetic valves 74 and 75 according to a preset program based on the signals C5 and JS. Exit the signal. Reference numerals 80, 81, and 82 are setting switches, respectively, which set the sequencer 78 for synchronous drive, shield jack independent drive, and power slide jack independent drive.

Next, a shield tunnel underground bonding method, which is an embodiment of the present invention, will be described using an underground bonding device having the above-described configuration.

(i) Tunnel excavation First,.../- Rud eA10. ．． 40 to excavate tunnels Ta and Tb from both ends of the tunnel, and assemble segments 12.42 on the walls of the tunnel Ta % T b to perform the primary lining. At this time, by extending the tip blade 29.59 of the cutter device 11.41 by the telescopic mechanism 30.60, the tunnel Ta, , Tb to be excavated is
The diameter of the outer cylinder 14.44 is at least the same as that of the outer cylinder 14.44.

In addition, in tunnel excavation by these tunnels 1tio and 401, the excavation by the second shield machine 40 is preceded, and the excavation plan is designed so that the second shield machine 40 reaches the tunnel junction described later first. Keep it upright.

Note that the protective ring 52 of the second shield machine 40 may be positioned in any position within the penetration chamber 46, but the protective ring 52 should be positioned in the front part of the penetration chamber 46 when excavating the tunnel Tb. This makes it possible to prevent excavated earth and gravel from entering into the penetration chamber 46.

(ii) Stopping the second shield machine As mentioned above, tunnel excavation by the second shield machine 40 is performed by the first shield machine IO! - Since the tunnel excavation is preceded, the second shield machine 40 reaches the tunnel junction first (see Fig. 7). Next, the cutter slide jack 64 and the shield jack 65 are synchronized and driven by the hydraulic mechanism and sequencer 78 to shorten the extended tip blade 59 to its original length. While storing the cutter device 41 in the inner cylinder 45, the shield machine 40 is
The shield machine 40 is propelled forward so as not to create a gap between the front surface and the ground (see FIG. 8).

The operation of the sequencer 78 will be explained using the flowchart shown in FIG. When the program starts (step 5PI), the tuning circuit is commanded to turn on (step 5P2).
), cutter slide jack 6 from detector 76.77
4 and the signals C5 and JS indicating the stroke amount of the shield jack 65 are read (step SP3.5P4).
.

Next, a command signal to shorten the cutter slide jack 64 and extend the shield jack 135 is sent from the sequencer 78 to each electromagnetic valve 74.75, thereby operating each jack 64.65 ( Step 5P5)
. Then, while the cutter slide jack 4 is shortened, the shield jack 65 is extended (step SP6.5P7), so that the cutter device t41 is moved to the shield machine 4.
This cutter device 40 is housed in the inner cylinder 45 by moving backward I along the axis of 0, and the shield device 40 is
The whole thing is propelled forward.

Even while each jack 64, 65 is being driven, the signals C8 and JS representing the jack stroke amount are read, and their increment ΔC81ΔJS is calculated sequentially for each unit time (
Step 5P8). Then, in step SP9, these increments ΔC51ΔJS are compared, and if ΔC5<ΔJS, the process moves to step 5PIO, and if ΔC3>ΔJS, the process moves to step SPI t.

In step 5PIO, the extension drive of the shield jack 65 is stopped, and the program further advances to step 5P12. On the other hand, in step 5PII, the shortening drive of the cutter slide jack 64 is stopped, and the program moves to step SP7, so that only the shield jack 65 is driven.

In step SPI 2, it is determined whether the absolute stroke amount of the shield jack 65 has reached a preset maximum value, and if it has reached the maximum value, the program is stopped (step 5P13) and the lFt large value is reached. If not, the process moves to step 5P14.

In step 5P14, it is determined whether the absolute stroke amount of the cutter slide jack 64 has reached a preset maximum value, and if it has reached the maximum value, the program is terminated (step 5P15). By proceeding to step SP6, only the cutter slide jack 64 is driven.

In this way, by driving the cutter slide jack 64 and the shield jack 65 synchronously, the cutter device 41 can be stored in the inner cylinder 45 while the cutter device 4
1, the shield machine 4 (lr) can be propelled forward so as not to create a gap between the shield machine 40 moe surface and the ground.

(ii) Even when the second sole F machine 40 performs the cutter device 40 storage process described above, the first shield machine 10 is excavating a tunnel. And these shield machines l01
When 40 approaches to a distance of about three times the captain of the shield aircraft, confirm the relative positions between the shield aircraft 10.40. This relative position confirmation means may be a well-known and commonly used means, and no special technique is required. Then, the tunnel excavation is continued while the excavation direction of the first silt machine 10 is corrected so that both axes of the shield machines 10 and 40 coincide with each other.

Then, at the junction of the tunnel, the shield machine 10.
By stopping the first shield machine 10 in the second state leaving a predetermined length of ground Gi between 40 and 40, the shield machine 10.4
0 facing each other at the tunnel junction (see Figure 9).

Next, a step of storing the cutter device 11 of the first shield machine 10 is performed. That is, after the extended tip blade 29 is shortened to its original length, the hydraulic mechanism and sequencer 78 drive the cutter slide jack 34 and the shield jack 35 in synchronization. While storing the cutter device xi in the inner cylinder 15, the shield ta10 is propelled forward so as not to create a gap between the front surface of the shield machine 10 and the ground as the cutter device 11 is stored (see Fig. 10). ). The details of this process are the same as those in the second shield machine 40 described above, so the explanation thereof will be omitted.

At the same time, if the protection ring 52 is located deep in the penetration chamber 46, the protection ring 52 is slid to the front of the penetration chamber 46 by driving the retraction jacks 50, 50, . As a result, the earth, sand and gravel that have entered the penetration chamber 46 are discharged to the outside. In this state, the extrusion jack 20.
20,..., the penetrating ring 16 is moved to the first position.
The shield device 10 is slid forward along the axis of the skin plate 13, and its tip is brought into contact with the protective ring slope 52a. Furthermore, extrusion jacks 20, 20,...
While continuing to push out the penetrating ring 16, the retraction jacks 50, 50 . ... slides the protective ring 52 backward while keeping the tip of the penetrating ring 16 in contact with the inclined surface 52a, thereby drawing the penetrating ring 16 deep into the penetrating chamber 46. .

That is, this penetrating ring 16 allows the shield machine 10 to
．． This covers the ground Gf at the tunnel junction left between 40 and 40 (see Figure 10).

(iv) Finishing of the tunnel joint After this, the cutter device 11.41 and the support portion 23.53 are dismantled and removed, peripheral equipment such as the erector device 33.63 is removed, and both ends of the penetration ring 16 are finished inside. Cylinder 1
5. Weld and fix to 45.

And the skin plate 13 of the shield filO140
．． The tunnel joint will be lined by pouring cast-in-place concrete to the inner surface of 43, including the thickness of the secondary lining. Here, for the purpose of reinforcing the tunnel joint, a support made of, for example, H-shaped steel may be provided on the inner surface of the inner cylinder 15.45.

By using the above construction method, the construction of the shield tunnel joint will be completed. Here, at the time of tunnel joining, the cutter devices 11, 41 of each shield machine 10.40
By shortening the tip blade 29.59 of the cutter device t
t, 4t can be made smaller in diameter than the inner diameter of the inner cylinder 15.45, thereby shortening the moving jack 34.64, thereby reducing the support part 23.53 and eventually the cutter device 1.
1.41 can be stored in the inner cylinder 15.45. Therefore, at the time of tunnel junction, the silt machine 10.
Since both shield machines 10.40 can be brought close together to the extent that the front ends of the skin plates 13.43 of the 40 are in contact with each other, the ground G near the tunnel junction can be
It is possible to ensure earth retention and water stoppage against the earth water pressure acting near the joint, and the construction of the shield tunnel joint can be carried out safely. In addition, unlike the conventional underground bonding method mentioned above, there is no need to use auxiliary construction methods such as the freezing method, so it is possible to construct the joint without requiring a large amount of work and construction time when joining the tunnel. Become.

In particular, in the underground joining method and equipment of this example,
Since the Kanta slide jack 34.64 and the shield jacks 35, 65 are driven in synchronism, when the cutter device 11.41 described above is housed in the inner cylinder 15.45, the cutter device 11. 41, the shield machine 10140 can be propelled forward so as not to create a gap between the front part of the shield machine 10°40 and the ground.

That is, by storing the cutter device 11.41 in the inner cylinder 15.45, a gap corresponding to the width of the cutter device 11.41 is created between the front part of the shield machine 10.40 and the ground, and the tunnel Cutter device 11.41 during excavation
This results in the release of the pressure applied to the face (especially at the front).

Therefore, there is a risk of landslide on this face,
Since it may become impossible to extrude the penetrating ring 16,
It is necessary to apply mud water pressure and mud pressure to the face, but these require complicated management depending on the soil conditions of the ground, and inadequate pressure may cause ground heave or subsidence. .

However, according to this practical example, by driving the cutter slide jack 34.64 and the shield jack 35.65 in synchronization, it is possible to advance the shield machines 10, 40 while storing the cutter device 11.41. I can do it,
Thereby, the canter devices 11, 41 can be stored without creating a gap between the shield machine 10, 40 and the ground. Therefore, the cutter device 11.41 (front side) can press the face at all times, prevent ground collapse, and extrude the penetrating ring 16 smoothly.

In addition, if the stroke amount of the cutter slide jack 34.64 and the shield jack 35.65 are controlled to be the same as shown in the flowchart in Fig. 6, almost no pressure will be applied to the face surface, and the ground will rise. can be prevented. On the other hand, if the oil pressure of the cutter slide jacks 34 and β4 is controlled to be constant, the face surface can be held at a constant pressure, and effective ground collapse countermeasures can be taken against collapsible soft ground. . Moreover, by using this method in conjunction with the management of mud water pressure and mud pressure, it is possible to prevent ground collapse even more effectively.

Note that the details of the shield tunnel underground joining method and underground joining apparatus of the present invention are not limited to the above-mentioned embodiments, and various modified embodiments are possible. - As an example, the second shielding machine 40 is provided with a water stop material injection pipe (not shown) whose one end opens into the penetration chamber 46,
At the time of tunnel joining, the penetration chamber 46 may be filled with a stop material using this water stop material injection pipe to further ensure water stop at the tunnel joint. Further, the injection point of this stopper is not limited to the inside of the penetration chamber 46, and the injection work may be performed by appropriately disposing an injection pipe at a place where water stoppage is required.

Further, although the underground bonding apparatus of the above embodiment uses a so-called intermediate support type shield machine, it goes without saying that it can be constructed using various well-known and commonly used shield machines.

``Effects of the Inventionj'' As explained in detail above, according to this invention, a tunnel can be constructed by using two shield machines to excavate tunnels from both ends of the tunnel to be constructed and join them in the middle. In the method and apparatus for underground joining of a shield tunnel to be completed, the cutter device installed at the front of the skin plate of the shield excavator is configured to be able to be stored in the inner cylinder at the tip of the skin plate, and the Since the shield machine is advanced in synchronization with the cutter equipment storage, the cutter equipment can be stored without creating a gap between the shield machine and the ground.Therefore, the cutter equipment can always hold down the face surface. It is possible to prevent ground collapse and allow the underground joining process to be carried out smoothly.Therefore, it is possible to ensure earth retention and water stoppage against the earth water pressure that acts from the ground near the tunnel joint to the joint. Therefore, it is possible to construct the joint part of the shield tunnel with one degree of safety.Furthermore, if the underground joining method and device of the present invention are used to join the shield tunnel underground, it will be possible to construct the joint part of the shield tunnel with ease. Since there is no need to use an auxiliary construction method such as the freezing construction method, the joint can be constructed without requiring a large amount of construction cost or construction time when joining the tunnel.

[Brief explanation of the drawing]

1 to 4 are diagrams showing an underground joining device for a shield tunnel which is an embodiment of the present invention, in which FIG. 1 is a side view showing one of the shield machines, and FIG. 2 is a front view. , Fig. 3 is a side view showing the other shield machine, Fig. 4 is a front view, Fig. 5 is a hydraulic circuit diagram showing the hydraulic rock structure for driving the cutter slide jack and shield jack, and Fig. 6 is a control diagram. A flowchart showing the operation, FIGS. 7 to 10 are process diagrams for explaining an underground joining method for a shield tunnel, which is an embodiment of the present invention, and FIG. 11 is a diagram showing a conventional underground joining method. It is. G...Ground, S...Underground joining device, T
a s T b...Tunnel, 10.40...Shield excavator, 11,41.
... Cutter device, 12.42 ... Segment, 13.43 ... Skin plate, 14.
44...Outer cylinder, 15.45...Inner cylinder,
16...Penetration ring, 34, 64...
Cutter slide jack (cutter device moving means), 35
．． 65...Shield Jatsugi, 78...
- Sequencer (control means).

Claims (2)

[Claims] (1) Using two shield machines that propel the tunnel underground while excavating the ground using a cutter device installed at the front and assembling segments for the primary lining inside, the machine starts from both ends of the tunnel to be constructed. This is an underground joining method for shield tunnels in which the tunnel is completed by excavating tunnels and joining them midway, and the tip of the skin plate is formed double by an outer cylinder and an inner cylinder. A first shielding machine is provided, in which a penetrating ring is stored between the outer cylinder and the inner cylinder, and the cutter device is configured to be able to be stored inside the inner cylinder; A second shielding machine is formed of a double shielding machine with an outer cylinder and an inner cylinder having the same diameter as the first shielding machine, and the second shielding machine is configured such that the cutter device can be freely stored inside the inner cylinder. a step of excavating a tunnel, and immediately before the end of this tunnel excavation step, one of the shield machines is moved forward while the cutter devices of the first and second shield machines are stored inside their respective inner cylinders, and , by sliding the penetrating ring of the first shield machine forward along the axis of this shield machine, the ground of the tunnel junction left between the first and second shield machines is removed by this penetrating ring. Step of covering the mountain: After this step, the skin plates of the first and second shield machines are left in place, the shield machines are dismantled, the ground at the joint is excavated, and the inner surface of the skin plate is removed. An underground connection method for a shield tunnel comprising the steps of: pouring concrete into the wall of the joint and lining the wall of the joint. (2) While excavating the ground using the cutter device installed at the front, assembling segments for the primary lining inside, the shield jack takes reaction force to the tips of these segments to propel the underground. An underground connecting device for shield tunnels that uses two shield machines to complete a tunnel by excavating tunnels from both ends of a tunnel to be constructed and joining them midway, wherein one of the shield machines The tip of the skin plate is double formed by an outer cylinder and an inner cylinder, and there is a penetrating ring between the outer cylinder and the inner cylinder of this shield machine that is movable in the front and back direction of the shield machine. is housed in the other shield machine, and the penetrating ring penetrates into the other shield machine because the tip of the skin plate is double formed by an outer cylinder and an inner cylinder having the same diameter as the one shield machine. Further, the cutter device of each shield machine is configured to be freely stored inside the inner cylinder of the skin plate by a moving means, and each of these shield machines has a cutter device moving means. An underground connecting device for a shield tunnel, characterized in that a control means is provided for synchronizing and driving the shield jack and the shield jack.