JPH02144495A - Indentation ring extruder of underground connection type shield machine - Google Patents

Abstract

PURPOSE:To make it possible to equalize a stroke amount of each of extruding jacks by constituting an underground connection type shield machine indentation ring extruder of the extruding jacks having one end mounted to an indentation ring and a hydraulic mechanism supplying an equal amount of pressure oil to each of the extruding jacks. CONSTITUTION:Each extruding jack 17 is such that a cylinder bottom 17a as one end thereof is connected to the rear end of an indentation ring 13 with a pin and that a rod head as the other end is fixed to the inside of a shield machine, and the indentation ring 13 is so formed that it is capable of moving back and forth along an axis of a shield machine 1. A hydraulic mechanism supplying an equal amount of pressure oil to extruding jacks 17 and 17 is provided to the shield machine 1. According to the constitution, in any case, the indentation ring can be pushed out in parallel with the axis of the shield machine, and an intrusive ring extruding process can be surely carried out.

Description

[Detailed description of the invention] "Industrial usage meter" This invention is used for an underground joining method in which tunnels are excavated from both ends of a tunnel to be constructed and joined in the middle to complete the tunnel. This invention relates to a penetrating ring extrusion device for an underground joint type shield machine.

``Conventional technology'' In recent years, with the aim of shortening the construction period using the SILDOE method for excavating tunnels in soft ground, starting shafts are excavated at positions corresponding to both ends of the tunnel to be constructed. A method called the underground joint method has been proposed and implemented, in which the tunnel is completed by excavating a tunnel using two shield machines and joining them halfway. However, since a cutter device for excavating the ground is usually installed at the tip of each shield machine,
It is very difficult for these two shield machines to approach each other to the extent that their tips abut each other at the joint. Therefore, when joining a tunnel, it is necessary to dismantle the shield machine with a predetermined distance of ground left in the vicinity of the joint, and to excavate and remove the remaining ground by some means. However, if the tunnel was joined using the method described above, the earth retaining work and water stop work for the remaining ground would be large-scale work, and the construction cost and construction period would increase, making it extremely uneconomical. .

Therefore, one of the two shield machines is equipped with a cylindrical penetrating ring that is housed in its skin plate, and this penetrating ring covers the ground at the joint during tunnel joints. Recently, underground joint construction methods have been proposed that can safely and reliably connect tunnels by providing earth retaining and water supply. That is, as shown in FIG. 5, the tip of the skin plate la of the first shield machine l of the two shield machines is formed double by an outer cylinder 11 and an inner cylinder 12, and Outer cylinder 1
A cylindrical penetrating ring 13 is stored between the shielding machine 1 and the inner cylinder 12, and the tip of the skin plate 2a of the second shielding machine 2 is connected to the outer cylinder 21 and the inner cylinder having the same diameter as the first shielding machine. 22, thereby forming a penetration chamber 23 into which the penetration ring is penetrated. Then, when tunnels Ta and Tb are dug from both ends of the tunnel to be constructed using these first and second shields al and 2 and joined together, the penetration ring 13 is inserted along the axis of the shield machine l. By sliding the penetrating ring 13 forward, the tip of the penetrating ring 13 penetrates into the penetrating chamber 23 of the second shielding machine 2, and this penetrating ring 13 allows the first and second shielding machine 1.2 to be connected to each other. Cover the ground Gi left between. This makes it possible to safely and reliably join the tunnels Ta and Tb by retaining earth and water at the tunnel joint, and significantly reducing the construction cost and time required for joining. .

"Problems to be Solved by the Invention" By the way, in the underground joining method using the penetration ring 13, the tip of the penetration ring 13 is penetrated into the penetration chamber of the second shielding machine 2 at the time of tunnel joining. An extrusion device is required to extrude the ring 13 forward. As an example of this extrusion device, as shown in FIG. 6, a plurality of penetrating ring extruding jacks 17 are arranged behind the penetrating ring 13 at intervals in the circumferential direction of the shielding machine 1; in the illustrated example, only one is shown. ), its cylinder base end 17a
A device in which the penetrating ring is connected to the rear end portion 13a of the penetrating ring with a pin is conceivable. At this time, pressurized oil is supplied to each extrusion cylinder 17 from a common hydraulic pump via an operating valve (both paths shown). Note that the reference numeral 32 in the figure is a penetrating ring bearing.

However, in such a penetrating ring extrusion device, there is a difference in the amount of pressure oil supplied to the extrusion jack 17 due to piping resistance, etc., and a stroke difference between the jacks 17 occurs. If this stroke difference becomes extreme, the penetrating ring 13 will no longer be pushed out in parallel to the axis of the shield machine l, and as shown in FIG. There is a risk that you will not be able to push it out. This phenomenon may also occur when the resistance between the rear part of the penetrating ring 13 and the ground, etc. is different.

The present invention has been made in view of the above-mentioned circumstances, and provides a penetration ring extrusion device for an underground bonding type shield machine that can reliably carry out the penetration ring extrusion process by equalizing the strokes between a plurality of extrusion jacks. is the problem.

``Means for Solving the Problems'' Therefore, the present invention provides that the tip of the skin plate is formed double by an outer cylinder and an inner cylinder, and a penetrating ring is housed between the outer cylinder and the inner cylinder. The penetration chamber into which the penetration ring is penetrated is formed by the first shield machine having the same diameter and the tip of the skin plate being double formed by an outer cylinder and an inner cylinder having the same diameter as the first shield machine. A penetrating ring of an underground joint type shield machine that excavates the tunnel to be constructed from both ends and joins them in the middle to complete the tunnel. A plurality of extrusion devices are arranged at intervals in the circumferential direction of the shield machine, each having an extrusion jack with one end attached to the penetration ring, and a hydraulic mechanism that supplies an equal amount of pressure oil to each of these extrusion jacks. The above problem is solved by configuring the following.

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

Hereinafter, embodiments of this invention will be described with reference to FIGS. 1 to 3. In the figure, the symbol G is a mountain near the junction of the shield tunnel that has been excavated from both ends.
In addition, within the mountain G, the first shield fllH excavates a tunnel Ta on the right side with respect to the plane of the paper using the cutter device 10 provided at its front part, and the second shield machine 2 excavates a tunnel Ta on the right side with respect to the paper surface. The other tunnel Tb is excavated on the left side of the page by a cutter device 20 provided in the figure. And the first
The wall surface of the tunnel Ta formed behind the shield machine l is primarily lined with segments 3a, 3a, . . . assembled inside this shield machine l, and similarly,
Second shield a! Tunnel Tb formed behind 2
The walls of the shield machine 2 have segments 3b and 3b assembled inside the shield machine 2.

The primary lining has been done by...

The tip of the cylindrical skin plate 1a forming the outer shell of the first shielding machine 1 is an outer cylinder 11 formed to have the same diameter as the skin plate la, similar to the conventional shielding machine.
and an inner cylinder 12 formed to have a smaller diameter than this outer cylinder 11, and this inner cylinder 12 is formed by a partition plate 14 formed perpendicularly to the axis of the shield machine l. It is connected to the skin plate 1a. A penetration ring 13 made of a cylindrical iron plate is housed between the outer cylinder 11 and the inner cylinder 12.
A sealing material 30, 30 such as a lip seal, a U seal, an O seal, etc. is provided at the tip of the inner cylinder 12 to close the space between these and the penetrating ring 13.

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, and inside each of these through holes 16. A plurality of extrusion jacks 17 (only one is shown in the figure) whose axes are parallel to the axis of the shielding machine 1 are disposed. This extrusion jack 17 has a cylinder bottom 17a, which is one end thereof, which is connected to the penetrating ring 1.
3, and the other end of the rod head (as shown) is fixed inside the shield machine. Thereby, the penetration ring 13 is configured to be freely movable back and forth along the axis of the shield machine 1.

Further, these penetration rings 13 are provided on the outer peripheral surface of the inner cylinder 12.
A bearing 32, such as a thrust bearing, is provided between the inner cylinder 12 and slidably supports the penetration ring 13. If this bearing 32 has a mechanism that allows its upper surface to contact the inner circumferential surface of the penetrating ring 13 and cause it to slide,
Any suitable means may be selected from well-known means, and for example, it may be general sliding bearings including the above-mentioned thrust bearings. Further, the bearings 32 may be provided at intervals in the circumferential direction of the inner cylinder 12, or may be provided without any gaps in the circumferential direction.

Further, the first shield machine 1 is provided with a hydraulic mechanism that supplies an equal amount of pressure oil to the extrusion jacks 17, 17, . . . . The details of the hydraulic mechanism will be described below with reference to FIG. 3.

In the figure, the extrusion jacks 17, 17, . . . are provided in the first shield [1 as described above, and their explanation will be omitted. The reference numeral 50 is an oil tank, and the reference numeral 51 is a multi-70-pump. A pole valve 52 and a suction filter 53 are interposed between the oil tank 50 and the multi-flow pump 51.

The multi-pump 51 is configured to constantly supply the same amount of pressure oil to a plurality of discharge ports by driving an electric motor 54, and is connected to a plurality of extrusion jacks 17, 17 via piping 55, 55, . . . , ... is supplied with pressure oil. A check valve 56 and a pressure oil distribution mechanism 57 are interposed between the multi-pump 51 and each extrusion jack 17, . . . .

This pressure oil distribution mechanism 57 branches into the pipe 55.
A pressure gauge 59 and a pressure gauge stop valve 6 connected via
0, a relief valve 63 similarly connected to the pipe 55 via a branch pipe 62, and a manifold 64 connected to the pipe 55. Oil from the relief valve 63 is returned to the oil tank 50 via piping 65.

The manifold 64 is composed of three electromagnetic valves 66, 67, and 68 connected in parallel to the piping 55. The solenoid valve 66 is a two-point/two-position switching valve, and its P boat is connected to the oil tank 50 via the piping 55 as described above, while the A boat I/ is connected to the return curve via the piping 69. It is connected to the piping 65. The heart valves 67 and 68 are both 3
It is a two-position switching valve with a P-bot having a configuration of V5.
5, while the T-boat is connected via pipes 70.71 to said pipe 65 for the return bend.

Further, the A boats of the solenoid valves 68 and 69 are connected to both oil chambers of the extrusion jack 17, respectively.

For the hydraulic mechanism with the following configuration, in order to extend the pusher jack 17, the solenoid valves 66 and 68 should be energized, and conversely, in order to shorten the pusher jack 17, the solenoid valve 66.67 should be excited.

On the other hand, in the second shield machine 2, the tip of the skin plate 2a is double 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 (as shown) formed perpendicular to the axis of the shield machine 2. A space surrounded by the outer cylinder 21, inner cylinder 22, and partition plate is a penetration chamber 23 into which the penetration ring 13 of the first shield machine 1 is penetrated. A protective ring 34 having a thickness slightly thinner than the distance between the outer tube 21 and the inner tube 22 is fitted into the penetration chamber 23 . A sloped surface that slopes backward toward the center of the shielding machine 2 is formed on the front surface of the protective ring 34, which improves the ability to bond with the penetrating ring 13 and facilitates the smooth intake of excavated earth and sand. It is being In addition, at the rear end of the protective ring 34, there are 7 retraction gears (as shown) at intervals in the circumferential direction.
A plurality of protective rings 34 are provided, so that the protective ring 34 is configured to be movable back and forth along the axis of the shield machine. Note that, like the first shield machine 1, the second shield machine 2 is also provided with a hydraulic mechanism for supplying an equal amount of pressure oil to its retraction jack, but its explanation will be omitted.

In addition, in the figure, symbols 18 and 28 respectively indicate shield machine 1.
, 2 at intervals in the circumferential direction in the skin plate 1.2a, and propels the shield machine 1.2 forward by taking a reaction force at the tips of the segments 3a, 3b, reference numeral 15. .25 is each shield I
f! This is a partition plate provided so as to close the inside of the inner cylinder 12.22.

In addition, in this embodiment, the cutter device 10 for excavating another mountain is
, 20 are formed to have a slightly smaller diameter than the inner cylinder 12.22, and their shaft bodies 19.29 are pivotally supported by the partition plates 15.25, and the peripheral edges of these cutter devices 10.20 are
Canter part 10a that is expandable and retractable in the radial direction of the shield machine 1.2
, 20a are provided. In addition, these cutter devices 1
0.20 is configured to be movable along the axis of the shield machines 1 and 2, so that the cutter device 10.20 can be stored in the inner cylinder 12.22 during tunnel joining.

Using shield machine 1.2 having the above configuration, l
・The method for joining tunnels is almost the same as the underground joining method described above. This will be explained below.

(+) Tunnel excavation First, using shields fil, 2, while excavating tunnels Ta and Tb from both ends of the tunnel, tunnel Ta1
The primary lining is performed by assembling segments 3a and 3b on the wall surface of Tb. At this time, by extending the cutter parts 10a and 20a of the cutter device 1O120 in the radial direction of the shield machine 1.2, the diameter of the tunnel Ta%Tb to be excavated is made at least the same diameter as the outer cylinder 11.21. In addition, in tunnel excavation by these shield machines 1.2, the excavation by the second shield machine 21 is preceded, and the excavation plan is designed so that the second shield machine 2 reaches the tunnel joint part described later first. stand up.

Note that the protective ring 34 of the second shield machine 2 may be positioned in any position within the penetration chamber 23, but the protective ring 34 should be positioned in the front part of the penetration chamber 23 when excavating the tunnel Tb. Therefore, it is possible to prevent excavated earth and gravel from entering the inside of the penetration chamber 23.

(ii) Stopping the second shield machine As mentioned 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 starts the tunnel junction. reach the department. Next, after shortening the extended cutter section 20a to its original length, the cutter device 1ffi2
0 in the inner cylinder 22, the shield machine 2 is propelled forward.

(Ill) Tunnel Junction While the second shield machine 2 is performing the cutter device 20 storage process described above, the first shield machine 1 is also excavating a tunnel. Then, when these shield aircraft 1 and 2 approach to a distance approximately three times the length of the captain of the shield aircraft, the relative positions between the shield aircraft 1 and 2 are completely confirmed. This relative position confirmation means may be a well-known and commonly used means, and no special technique is required. And these shield S! ll,
Tunnel excavation is further continued while correcting the excavation direction of the first shield machine 1 so that both axes of the first shield machine 1 and the first shield machine 1 coincide with each other.

Then, at the tunnel junction, the shield machine 1.2
By stopping the first shield machine 1 with a predetermined length of ground Gi (approximately 30 cm to 1 m) remaining between them, the shield machines 1 and 2 are made to face each other at the tunnel junction.

Next, a step of storing the cutter device 10 of the first shield machine 1 is performed. In a second, after shortening the extended cutter portion 10a to its original length, the shield l1ll is propelled forward while the cutter device 10 is accommodated in the inner cylinder 12. At the same time, if the protection ring 34 is located deep inside the penetration chamber 23, the protection ring 34 is removed from the penetration chamber 23.
It is slid to the front part, thereby discharging the earth, sand and gravel that have entered the penetration chamber 23 to the outside.

In this state, by driving the extrusion jack 17, the penetrating ring 13 is inserted into the skin plate l of the first shield all.
Slide it forward along the axis of a, and bring the tip into contact with the protection ring 34. Furthermore, while continuing to push out the penetrating ring 13 by the extrusion jack 17, in conjunction with this, the retracting jack (as shown) is driven to keep the tip of the penetrating ring 13 in contact with the inclined surface. Slide the protective ring 34 backwards, thereby causing the penetrating ring 1
3 to the depths of the penetration chamber 23 (see Fig. 5, 8). That is, this penetrating ring 13 allows the shield machine 1.2
This covers the ground Gi left at the tunnel junction between 0 and 0.

(iv) Finishing of the L-shaped joint After this, the cutter devices 10 and 20 are dismantled and removed, the partition plate 15.25 is cut and removed, and both ends of the penetrating ring 13 are attached to the inner cylinder 12.22. Weld and fix.

Then, the skin plates La and 2a of the shield machines 1 and 2
The tunnel joint is lined by pouring 11 concrete, including the thickness of the secondary lining, on the inner surface, thereby completing the construction of the tunnel joint.

Through the steps described above, a tunnel underground joining step can be performed. Here, the shield machine l of this embodiment has 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.
is provided, so even if the piping resistance between the pump and the jack 17 is different, or even if the resistance between the tip of the penetrating ring 13 and the ground is different, the stroke amount of each extrusion jack 17 can be adjusted. can be made equal. This allows the penetration ring 13 to be shielded under any circumstances! It becomes possible to extrude parallel to the axis of the penetrating ring 13, and the extrusion process of the penetrating ring 13 becomes reliable.

In addition, the hydraulic pressure of each extrusion jack 17 is measured by the hydraulic pressure gauge 59.
By measuring the resistance between the tip of the penetration ring 13 and the ground, it is possible to estimate the pressure exerted by the tip of the penetration ring 13 on the tip surface of the protection ring 34. Another advantage is that this pressure can be controlled to an appropriate pressure by appropriately adjusting the retraction speed of the protective ring 34, etc.

Note that the details of the penetrating ring extrusion device for an underground bonding shield machine of the present invention are not limited to the above-mentioned embodiments, and various modifications are possible.

Effects of the Invention As described above in detail, according to the present invention, a plurality of penetrating ring extrusion devices for an underground joint type shielding machine are arranged at intervals of this length in the circumferential direction of the shielding machine. is composed of an extrusion jack attached to the penetration ring and a hydraulic mechanism that supplies an equal amount of pressure oil to each of these extrusion jacks, so even if the piping resistance between the hydraulic mechanism and the jack is different, Alternatively, even if the resistance between the penetrating ring tip I and other threads is different, the stroke amount of each extrusion jack can be made equal. This makes it possible to extrude the penetrating ring parallel to the axis of the shielding machine in any case, and the penetrating ring extrusion process becomes reliable.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a penetrating ring extrusion device for an underground type shield machine which is an embodiment of the present invention, and FIG. 1 is a sectional view showing the entire underground type shield machine. ,
Fig. 2 is an enlarged cross-sectional view of the vicinity of the penetrating ring extrusion device, Fig. 3 is a hydraulic circuit diagram showing the hydraulic mechanism, and Fig. 4 shows an underground joining method to which an embodiment of the present invention is applied. Figure 5 is a cross-sectional view showing an underground bonding type shield machine which is a conventional and an embodiment of the present invention, and Figure 6 is a cross-sectional view showing the vicinity of the penetration ring of the same shield machine in an enlarged view. It is a diagram. 1.2... Seal F'ms 1 a s 2
a...Skin plate, 10.20...
... Cutter device, 11.21 ... Outer cylinder, 12.
22... Inner cylinder, 13... Penetration ring,
17... Extrusion jack, 23... Penetration chamber, 51... Multiflow pump.

Claims (1)

[Claims] A first shielding machine, in which the tip of the skin plate is double formed by an outer cylinder and an inner cylinder, and a penetration ring is stored between the outer cylinder and the inner cylinder, and the tip of the skin plate. is formed double by an outer cylinder and an inner cylinder having the same diameter as the first shield machine, and a second shield machine in which a penetration chamber into which the penetration ring is penetrated is formed at the tip part. This is a penetrating ring extrusion device for an underground joining type shield machine that excavates a tunnel to be constructed from both ends and joins them in the middle to complete the tunnel. An underground joint type, characterized by comprising: a plurality of extrusion jacks arranged side by side, 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 these extrusion jacks. Penetration ring extrusion device of shield machine.