JP2594630B2 - Penetration ring extrusion device for underground joint type shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a ground used in an underground joining method for excavating tunnels from both ends of a tunnel to be built and joining them midway to complete the tunnel. The present invention relates to a penetrating ring pushing device of a middle joining type shield machine.

"Conventional technology" In recent years, in order to shorten the construction period of the shield method for excavating tunnels on soft ground, etc. A technique called an underground joining method, in which a tunnel is excavated by two shield machines and the tunnel is completed by joining them in the middle, has been proposed and implemented. However, since it is normal that a cutter device for excavating the ground is installed at the tip of each of the shield machines, these two shield machines abut their tips at the junction. It is very difficult to approach to the extent. Therefore, at the time of tunnel joining, it is necessary to disassemble the shield machine while leaving the ground at a predetermined distance in the vicinity of the junction, and excavate and remove the remaining ground by some means. However, when the tunnel junction is performed by the above-described method, the earth retaining work and the water stopping work on the remaining ground become large-scale, and the construction cost and the construction period increase, which is very uneconomical. .

Therefore, one of the two shield machines is provided with a cylindrical penetration ring housed in the skin plate of one of the shield machines, and the ground of the joint is covered by the penetration ring at the time of tunnel joining. An underground joining method has been recently proposed that can perform tunnel joining by performing earth retaining and waterproofing, thereby enabling safe and reliable tunnel joining. That is, as shown in FIG. 5, of the two units and the shield machine, the distal end of the skin plate 1a of the first shield machine 1 is formed by an outer cylinder 11 and an inner cylinder 12 in a double manner. A cylindrical penetration ring 13 is housed between the outer cylinder 11 and the inner cylinder 12, and a second
The distal end portion of the skin plate 2a of the shield machine 2 is formed by an outer cylinder 21 and an inner cylinder 22 having the same diameter as the first shield machine, so that the penetration ring 23 penetrates the penetration chamber 23.
Is formed. Then, tunnels Ta and Tb are dug from both side ends of the tunnel to be constructed by the first and second shield machines 1 and 2, and when joining them, the penetration ring 13 is attached to the axis of the shield machine 1. The front end of the penetrating ring 13 penetrates into the penetrating chamber 23 of the second shield machine 2 by sliding forward along the first and second shield machines 1, 2. Covers Giyama that was left in between. This makes it possible to join the tunnels Ta and Tb safely and securely by retaining the soil and stopping the water at the tunnel junction, and it is possible to greatly reduce the cost and time required for the joining. .

[Problem to be Solved by the Invention] By the way, in the underground joining method using the penetrating ring 13, the tip of the penetrating ring 13 penetrates into the penetration chamber of the second shield machine 2 at the time of tunnel joining. An extrusion device that pushes the ring 13 forward is required. As an example of this extrusion device, as shown in FIG. 6, a plurality of penetration ring extrusion jacks 17 are arranged behind the penetration ring 13 at intervals in the circumferential direction of the shield machine 1 (only one in the illustrated example). An arrangement is conceivable in which the cylinder base end 17a is pinned to the penetrating ring rear end 13a (shown).
At this time, pressure oil is supplied to each extrusion cylinder 17 from a common hydraulic pump via an operation valve (both not shown). In addition,
Reference numeral 32 in the drawing denotes a penetrating ring bearing.

However, in such a penetrating ring pushing device, a difference in the pressure oil supply amount occurs due to a pipe resistance or the like to the pushing jack 17, and a stroke difference of the jack 17 occurs. When the stroke difference becomes extreme, the penetrating ring 13 is not pushed out in parallel to the axis of the shield machine 1, and as shown in FIG. Extrusion may not be possible. This phenomenon may also occur when the resistance between the tip of the penetrating ring 13 and the ground is different or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a penetration ring extruding device of an underground joining type shield machine capable of ensuring a penetration ring extrusion process by equalizing a stroke between a plurality of extrusion jacks. Is a problem.

Therefore, according to the present invention, the distal end portion of the skin plate is formed as a double by an outer cylinder and an inner cylinder, and a penetration ring is stored between the outer cylinder and the inner cylinder. A first shield machine, and a distal end portion of a skin plate is formed by an outer cylinder and an inner cylinder having the same diameter as the first shield machine, so that the penetration ring is penetrated. Is a pair of a second shield machine formed at the tip and a penetrating ring of an underground joint type shield machine in which a tunnel to be built is dug from both side ends thereof and joined together halfway to complete the tunnel. A plurality of extrusion devices are disposed at intervals in the circumferential direction of the shield machine, and one end of the extrusion jack is attached to the penetration ring, and a hydraulic mechanism that supplies an equal amount of pressure oil to each of these extrusion jacks. Composed of its hydraulic machine A multi-flow pump having a plurality of discharge ports connected to each of the extrusion jacks and having a constant amount of pressurized oil discharged from the discharge ports, and each discharge port of the multi-flow pump and each extrusion The above problem is solved by providing a pressure oil distribution mechanism interposed in the middle of the pipe connecting the jack.

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

An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference symbol G denotes the ground near the junction of the shield tunnel excavated from both side ends. In this ground G, the first shield machine 1 is provided with a cutter device provided at the front thereof. 10, the tunnel Ta is excavated to the right side with respect to the plane of the paper, and the second shield machine 2 excavates the other tunnel Tb to the left side of the plane of the paper with the cutter device 20 provided at the front thereof. The walls of the tunnel Ta formed behind the first shield machine 1 are connected to the segments 3a, 3a,
..., and similarly, the second shield machine 2
The walls of the tunnel Tb formed behind are shielded by the segments 3b, 3b,...

The distal end of a cylindrical skin plate 1a forming the outer shell of the first shield machine 1 has an outer cylinder 11 having the same diameter as the skin plate 1a, similarly to the conventional shield machine.
And the inner cylinder 12 formed smaller in diameter than the outer cylinder 11,
The inner cylinder 12 is formed in a double shape, and is connected to the skin plate 1a by a partition plate 14 formed to be orthogonal to the axis of the shield machine 1. These outer cylinder 11 and inner cylinder
Between 12 and the penetration ring formed by forming an iron plate into a cylindrical shape
13 are stored, and seal members 30, 30 such as a lip seal, a U-seal, and an O-seal for closing the gap between the outer cylinder 11 and the inner cylinder 12 and the penetrating ring 13 are provided. Have been.

The partition plate 14 is provided with through holes 16 (only one is shown in the figure) at intervals in the circumferential direction of the shield machine 1, and inside each of these through holes 16. A plurality of extrusion jacks 17 (only one is shown in the figure) whose axis is parallel to the axis of the shield machine 1 are provided. The push-out jack 17 has a cylinder bottom 17a, one end of which is pin-joined to the rear end of the penetrating ring 13, and a rod head (not shown), the other end of which is fixed in a shield machine. Thereby, the penetration ring 13 is configured to be movable back and forth along the axis of the shield machine 1.

A bearing 32 such as a thrust bearing is provided on the outer peripheral surface of the inner cylinder 12 so as to be interposed between the penetration ring 13 and the inner cylinder 12 and slidably support the penetration ring 13. This bearing 32 contacts the inner peripheral surface of the penetration ring 13 on its upper surface,
Any mechanism that can slide this may be appropriately selected from well-known means. As an example, a general sliding bearing including the thrust bearing may be used. Further, the bearings 32 may be provided at intervals in the circumferential direction of the inner cylinder 12, or may be provided without gaps in the circumferential direction.

Further, the first shield machine 1 is provided with a hydraulic mechanism for supplying an equal amount of pressure oil to the extrusion jacks 17, 17,. Hereinafter, the hydraulic mechanism will be described in detail with reference to FIG.

In the figure, the extrusion jacks 17, 17,... Are provided in the first shield machine 1 as described above, and the description thereof will be omitted. Reference numeral 50 denotes an oil tank, and reference numeral 51 denotes a multi-flow pump.
The ball valve 52 and the suction filter 53 are interposed between them.

The multi-flow pump 51 is configured to constantly supply an equal amount of pressure oil to a plurality of discharge ports by driving an electric motor 54, and a plurality of extrusion jacks 17, 1 through pipes 55, 55,.
7, ... is supplied with pressurized oil. This multi-flow pump 5
A check valve 56 and a pressure oil distribution mechanism 57 are interposed between 1 and each of the extrusion jacks 17,.

The pressure oil distribution mechanism 57 includes a pressure gauge 59 and a pressure gauge stop valve 60 connected to the pipe 55 via a branch pipe 58, and a relief valve 63 similarly connected to the pipe 55 via a branch pipe 62.
And a manifold 64 connected to the pipe 55. The oil from the relief valve 63 is returned to the oil tank 50 via the pipe 65.

The manifold 64 is connected to the pipe 55 in parallel with the pipe 55.
It is composed of two solenoid valves 66, 67, 68. The solenoid valve 66 is a two-port two-position switching valve, the P port of which is connected to the oil tank 50 via the pipe 55 as described above, while the A port is connected to the pipe 65 for return oil via the pipe 69. It is connected. Each of the solenoid valves 67 and 68 is a three-port two-position switching valve, and the P port is connected to the pipe 55, while the T port is connected to the pipe 65 for return oil through the pipes 70 and 71. I have. Further, the A ports of the solenoid valves 68 and 69 are connected to both oil chambers of the extrusion jack 17, respectively.

In the hydraulic mechanism configured as described above,
When extending 17, the solenoid valves 66 and 68 may be excited. Conversely, when the extrusion jack 17 is shortened, the solenoid valves 66 and 67 may be excited.

On the other hand, in the second shield machine 2, the distal end of the skin plate 2 a is doubly formed by a cylindrical outer cylinder 21 and an inner cylinder 22 having the same diameter as the first shield machine 1, The inner cylinder 22 is connected by a partition plate (not shown) formed orthogonal to the axis of the shield machine 2. The space surrounded by the outer cylinder 21, the inner cylinder 22, and the partition plate is a first space.
Is a penetration chamber 23 into which the penetration ring 13 of the shield machine 1 is penetrated. Inside the penetration chamber 23, the outer cylinder 21 and the inner cylinder
Protective ring formed slightly thinner than the spacing between 22
34 are inserted. On the front surface of the protection ring 34, an inclined surface is formed which is inclined rearward toward the center of the shield machine 2, thereby increasing the crimpability with the penetration ring 13 and smoothly taking in excavated earth and sand. Have been. Also,
At the rear end of the protection ring 34, a plurality of pull-in jacks (not shown) are provided at intervals in the circumferential direction so that the protection ring 34 can move back and forth along the axis of the shield machine. Is configured. The second shield machine 2 is also provided with a hydraulic mechanism for supplying an equal amount of pressure oil to the retraction jack, similarly to the first shield machine 1, but its description is omitted.

In the figure, reference numerals 18 and 28 denote shield machines 1 and 2, respectively.
2, a propulsion jack which is provided in the skin plates 1a, 2a at intervals in the circumferential direction and takes a reaction force at the tips of the segments 3a, 3b to propel the shield machines 1, 2 forward.
Reference numerals 15 and 25 denote partition plates provided to close the inner cylinders 12 and 22 of the shield machines 1 and 2, respectively. In this embodiment, the cutter devices 10 and 20 for excavating the ground are equipped with the inner cylinder 1.
The shafts 19 and 29 are formed on the partition plates 15 and 25 to have a slightly smaller diameter than that of the cutter devices 2 and 22.
At the periphery of 0 and 20, there are provided cutter portions 10a and 20a which are expandable and contractible in the radial direction of the shield machines 1 and 2. These cutter devices 10 and 20 are configured to be movable along the axis of the shield machines 1 and 2, whereby the cutter devices 10 and 20 can be stored in the inner cylinders 12 and 22 at the time of tunnel joining. I have.

The method of joining tunnels using the shield machines 1 and 2 having the above-described configuration is almost the same as the above-described underground joining method. Hereinafter, this will be described.

(I) Tunnel excavation First, while excavating tunnels Ta and Tb from both sides of the tunnel using the shield machines 1 and 2, assembling the segments 3a and 3b on the wall surfaces of the tunnels Ta and Tb to perform primary lining. I do. At this time, the diameters of the tunnels Ta, Tb to be excavated are made at least the same as the outer cylinders 11, 21 by extending the cutter units 10a, 20a of the cutter devices 10, 20 in the radial direction of the shield machines 1, 2. In the tunnel excavation by these shield machines 1 and 2, the excavation by the second shield machine 2 is prioritized, and the excavation plan is set so that the second shield machine 2 reaches the tunnel junction described later first. Keep it up.

The position of the protection ring 34 of the second shield machine 2 in the penetration chamber 23 may be any position.
By locating the protection ring 34 in front of the penetration chamber 23 at the time of Tb excavation, intrusion of excavated earth and sand and gravel into the interior of the penetration chamber 23 can be prevented.

(Ii) Stop of the second shield machine As described above, since the tunnel excavation by the second shield machine 2 precedes the tunnel excavation by the first shield machine 1, first, the second shield machine 2 is connected to the tunnel. Reach the department. Next, after the extended cutter portion 20a is reduced to the original length, the cutter device 20 is moved to the inner cylinder 22.
The shield machine 2 is propelled forward while being housed inside.

(Iii) Tunnel junction Even when the second shield machine 2 is performing the above-described cutter device 20 storage step, the first shield machine 1 is excavating a tunnel. Then, when these shield machines 1 and 2 approach a distance about three times the captain of the shield machine,
Check the relative position between the shield machines 1 and 2. The relative position checking means may be a well-known and conventional means, and does not require any special technique. Then, the tunnel excavation is continued while the excavation direction of the first shield machine 1 is corrected so that the two axes of the shield machines 1 and 2 coincide with each other.

Then, at the junction of the tunnel, the shield machine 1,
By stopping the first shield machine 1 in a state where the ground Gi of a predetermined length (about 30 cm to 1 m) is left between the two, the shield machines 1 and 2 are opposed to each other at the tunnel junction.

Next, a step of storing the cutter device 10 of the first shield machine 1 is performed. That is, after the cutter unit 10a that has been extended is shortened to the original length, the shield machine 1 is propelled forward while the cutter device 10 is housed in the inner cylinder 12. At the same time, when the protection ring 34 is located at the back of the penetration chamber 23, the protection ring 34 is slid to the front of the penetration chamber 23, and thereby the earth and sand or the gravels that have entered the penetration chamber 23 are exposed to the outside. Discharge.

In this state, by driving the extrusion jack 17, the penetration ring 13 is slid forward along the axis of the skin plate 1 a of the first shield machine 1, and the tip thereof is brought into contact with the protection ring 34. Furthermore, the penetration ring by the extrusion jack 17
By driving the retraction jack (not shown) in conjunction with this while continuing to push the 13, the protection ring 34 is slid backward while the tip of the penetration ring 13 is in contact with the inclined surface. Thus, the penetration ring 13 is pulled into the penetration chamber 23 (see FIG. 5). That is, this penetration ring
By 13, the ground Gi of the tunnel junction left between the shield machines 1 and 2 is covered.

(Iv) Finishing of the tunnel junction After this, the cutter devices 10 and 20 were dismantled and removed,
The partition plates 15 and 25 are cut off and removed, and both ends of the penetration ring 13 are fixed to the inner cylinders 12 and 22 by welding. Then, by laying concrete including the thickness of the secondary lining on the inner surfaces of the skin plates 1a and 2a of the shield machines 1 and 2, the lining of the tunnel junction is performed, and thereby the construction of the tunnel junction is performed. Complete.

By the above-described steps, the tunnel underground joining step can be performed. Here, the shield machine 1 of this embodiment
Is provided with a multi-flow pump 51 that supplies an equal amount of pressure oil to each of the extrusion jacks 17 for extruding the penetration ring 13 so that even if the pipe resistance between the pump and the jack 17 is different, Alternatively, even if the resistance between the tip of the penetration ring 13 and the ground is different, the stroke amount of each extrusion jack 17 can be equalized. This makes it possible to push out the penetration ring 13 in any case in parallel to the axis of the shield machine 1.
The extrusion process is assured.

It should be noted that, without using the multi-flow pump 51 as described above, pressure oil is distributed and supplied to each of the extrusion jacks 17 from a normal hydraulic pump having a single discharge port. For example, it is conceivable to control the pressure oil supply amount to the same amount by using a flow control valve, but in such a case, it is usual that sufficient control accuracy cannot be obtained. In order to ensure the above, the hydraulic piping system and the control system must be extremely complicated, and the adjustment thereof is not easy. Therefore, application to a shield machine is not preferable.

Also, by measuring the operating oil pressure of each extrusion jack 17 with the oil pressure gauge 59, the resistance between the tip of the penetration ring 13 and the ground can be estimated, whereby the penetration ring 13
There is also the advantage that the pressure can be controlled to an appropriate pressure by estimating the pressure applied to the tip surface of the protection ring 34 by the tip of the protection ring 34 and appropriately adjusting the drawing speed of the protection ring 34 and the like.

The details of the penetrating ring pushing device of the shield machine for underground joining according to the present invention are not limited to the above embodiment, and various modifications are possible.

[Effects of the Invention] As described above in detail, according to the present invention, a plurality of penetration ring extrusion devices of an underground junction type shield machine are arranged at intervals in the circumferential direction of the shield machine, and one end is provided. Since the push-out jack attached to the penetration ring and a hydraulic mechanism that supplies an equal amount of pressure oil to each of the push-out jacks, even if the pipe resistance between the hydraulic mechanism and the jack is different, or Even if the resistance between the penetration ring tip and the ground is different, the stroke amount of each extrusion jack can be equalized. This makes it possible in any case to push out the penetrating ring parallel to the axis of the shield machine, thus ensuring the penetrating ring extrusion process. In addition, the hydraulic mechanism of the extrusion jack according to the present invention includes a multi-flow pump that supplies an equal amount of pressure oil to each extrusion jack from a plurality of discharge ports and a pressure oil distribution mechanism. It can secure excellent control information while avoiding complicated piping systems and control systems, and is particularly suitable for application as a hydraulic mechanism of an extrusion jack in a shield machine.

[Brief description of the drawings]

1 and 2 are views showing a penetration ring extruding device of an underground joint type shield machine according to an embodiment of the present invention, and FIG. 1 is a sectional view showing the entire underground joint type shield machine. FIG. 2 is a cross-sectional view showing, in an enlarged view, the periphery of the penetrating ring pushing device, FIG. 3 is a hydraulic circuit diagram showing a hydraulic mechanism, and FIG. FIG. 5 is a cross-sectional view showing an underground joint type shield machine according to the related art and one embodiment of the present invention, and FIG. 6 is an enlarged view of the vicinity of a penetration ring of the shield machine. It is sectional drawing. 1,2 ... Shield machine, 1a, 2a ... Skin plate, 1
0, 20 ... cutter device, 11, 21 ... outer cylinder, 12, 22 ... inner cylinder, 13 ... penetration ring, 17 ... extrusion jack, 23 ... penetration chamber, 51 ... multi-flow pump.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshimitsu Aso, 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Toru Goto, 2-6-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction (72) Inventor Takao Nakagawa 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation (72) Inventor Shigeru Nishitake 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries Kobe Shipyard Co., Ltd. (72) Inventor Masahiko Sugiyama 1-1-1, Wadazakicho, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-54-51228 (JP, A) Actual opening 63-136088 (JP, U)

Claims (1)

(57) [Claims] 1. A first shield machine in which a distal end portion of a skin plate is formed double by an outer cylinder and an inner cylinder, and a penetration ring is stored between the outer cylinder and the inner cylinder; The distal end portion of the skin plate is formed as a double by an outer cylinder and an inner cylinder having the same diameter as the first shield machine, so that a penetration chamber into which the penetration ring penetrates is formed at the distal end portion. A tunnel machine to be constructed, excavating a tunnel to be built from both side ends thereof and joining them in the middle of the tunnel to complete the tunnel. A plurality of extrusion jacks are provided at intervals in the circumferential direction, one end of which is attached to the penetration ring, and a hydraulic mechanism that supplies an equal amount of pressure oil to each of the extrusion jacks. For each extrusion jack A multi-flow pump having a plurality of discharge ports connected to each other and having a constant pressure oil discharge amount from the discharge ports, and a pipe connecting each discharge port of the multi-flow pump and each of the extrusion jacks. A penetrating ring extruding device for an underground joining type shield machine, comprising a pressure oil distribution mechanism interposed in the middle thereof.