JPH064999B2 - Structure of penetration room of underground joint type shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to an underground joint type shield machine for use in an underground joint method in which a tunnel to be constructed is excavated from both sides of the tunnel and joined in the middle to complete the tunnel. Regarding the structure of the penetration room.

"Prior Art" The applicant of the present invention uses the underground joining method for the shield tunnel shown in FIGS. 4 to 7 which is suitable for the case of previously performing the underground joining by the shield machine (Japanese Patent Application No. 61-101810). issue)
Provided.

In the figure, reference sign G is a rock mass near the junction of the shield tunnel, and in this rock mass G, the first shield machine 1
Excavates the first tunnel Ta by the cutter device 10,
Further, the second shield machine 2 excavates the tunnel Tb by the cutter device 20. The wall surface of the tunnel Ta is primarily covered with the segments 3a, 3a, ... And the wall surface of the tunnel Tb has the segments 3b, 3b ,.
The primary lining is being performed by.

The first shield machine 1 is provided with a cylindrical skin plate 1a, the tip portion 1b of which is the outer cylinder 1
The inner ring 12 and the inner cylinder 12 are doubly formed, and a penetrating ring 13 is housed therebetween. A partition plate 14 is provided inside the inner cylinder 12, and a pressure plate 15 is provided between the inner cylinder 12 and the outer cylinder 1a.
Is provided, and the pushing jacks 17, 1 are arranged in the circumferential direction.
A plurality of 7, ... Are attached, and the working end 17a of the push jack 17 is in contact with the rear surface of the penetration ring 13. A plurality of propulsion jacks 18, 18, ... Are attached to the rear surface of the pressure support plate 15 in the circumferential direction, and the working end 18a of the propulsion jack is in contact with the side surface of the segment 3a. The cutter device 10 is formed to have a diameter slightly smaller than that of the inner cylinder 12, the shaft body 19 thereof is axially supported by the partition plate 14, and the end edge portion of the cutter device 10 is expandable and contractible in the radial direction of the shield machine 1. The cutter unit 10a is provided.

The second shield machine 2 is provided with a cylindrical skin plate 2a having the same diameter as that of the first skin plate 1a, and the tip portion 2b thereof is the same as that of the first shield machine 1 as described above. By being double-formed by the cylinder 21 and the inner cylinder 22, a penetration chamber R into which the penetration ring 13 penetrates is formed. A partition plate 24 is fixed inside the inner cylinder 22, a ring-shaped pressure support plate 25 is fixed between the inner cylinder 22 and the skin plate 2a, and a ring 23 is fixed to the outer cylinder 21. A plurality of propulsion jacks 28, 28, ... Are attached to the rear surface of the ring 23, and the working end 28a of the propulsion jacks 28, 28 ,.
It is in contact with the side surface of b. Further, the cutter device 20 is
Cutter unit 20a having the same structure as the cutter device 10
And a shaft 29 are provided. It should be noted that the first and second shield machines 1 and 2 are configured such that the mud press-in pipes 16 and 26 are provided at the tip ends thereof, respectively.

Next, the underground joining method will be described with reference to FIGS. 4 to 7. First, as shown in FIG. 4, the ground G is excavated by using the first shield machine 1, and the segment is formed on the wall surface. The lining of 3a, 3a, ... Is performed, and one tunnel Ta is built by taking reaction force to this, and the other tunnel Tb is also built by the second shield machine 2. Then, as shown in FIG. 5, the first shield machine 1 and the second shield machine 2 were opposed to each other at the junction of the tunnel leaving a ground Gi (about 30 cm to 1 m) of a predetermined length. After that, the cutter unit 10 at the tip of the cutter device 10, 20
a and 20a are shortened. Next, as shown in FIG.
By driving the pushing jack 17 of the first shield machine 1,
The tip of the penetration ring 13 is the outer cylinder 2 of the second shield machine 2.
1 and the inner cylinder 22 are slid until they are inserted into the penetration chamber R, so that the tunnel connection left between the first shield machine 1 and the second shield machine 2 by the penetration ring 13 Part of the ground Gi is covered. Then, as shown in FIG. 7, the cutter devices 10 and 20 are disassembled and removed, the partition plates 14 and 24 are cut and removed, and the penetration ring 1 is further removed.
After welding both end parts of 3 to the inner cylinders 12 and 22, by laying concrete 31 including the thickness of the secondary lining on the inner wall surface of the skin plate, the lining of the wall surface of the joint part is performed. Perform to complete the junction of the tunnel.

Therefore, in the above construction method, the penetration ring 1 is inserted into the penetration chamber R.
By inserting 3, it is possible to cover the ground Gi of the joint, ensure soil retention and water stoppage of the joint, shorten the construction period and reduce the construction cost without using an auxiliary construction method such as the conventional freezing construction method. Can be achieved.

“Problems to be solved by the invention” However, in the underground joining method, the shield machine 2 is used.
Since the penetration chamber R is formed at the tip portion 2b of the skin plate 2a, during the normal excavation before joining, earth and sand, gravel and the like enter the penetration chamber R to close the penetration chamber R,
The penetration ring 13 of the shield machine 1 of the second shield machine 2
The problem that the penetration ring 13 cannot be smoothly penetrated into the penetration chamber R when it is inserted into the penetration chamber R to cover the natural ground Gi left between the first and second shield machines. Has occurred.

The present invention has been made in view of the above problems, and does not allow dirt, gravel, and the like to enter the inside of the penetration chamber, and when the penetration ring is penetrated even when it has penetrated, the An object of the present invention is to provide a structure of a penetration chamber of an underground junction type shield machine in which earth and sand and gravel are discharged and a penetration ring can be smoothly inserted into the penetration chamber.

[Means for Solving the Problems] In order to solve the above problems, the present invention is mounted slidably in the tunnel excavation direction between an outer cylinder and an inner cylinder in a penetration chamber and is a single body or a peripheral body. It is characterized in that it is provided with a protection ring divided into a plurality of parts in the direction and a drive device for reciprocating the protection ring in the penetration chamber via a rod.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show the first embodiment of the structure of the penetration chamber of the underground joint type shield machine of the present invention, and FIG. 3 shows the second embodiment. In these figures, the same components as those shown in the prior art of FIGS. 4 to 7 are designated by the same reference numerals and the description thereof will be omitted.

In FIGS. 1 and 2, reference numeral 1 is a part of a first shield machine that excavates a tunnel from one side (a cross section near a penetration ring), and 2 is a part of a second shield machine that excavates a tunnel from the other side. (Cross section near the penetration chamber). First
The front end portion 1b of the skin plate 1a of the shield machine 1 is double formed by the cylindrical outer cylinder 11 and the inner cylinder 12, and an iron plate is cylindrical between the outer cylinder 11 and the inner cylinder 12. The penetrating ring 13 formed in is stored. Then, between the outer cylinder 11 and the inner cylinder 12 and the penetrating ring 13, a sealing material 3 such as a lip seal, an O-seal, an O-ring, etc.
5, 35, ... Are attached. In addition, one end of the penetrating ring 13 has a plurality of rods 17a, 17a in the circumferential direction.
a are attached to the rods 17a, 17
are provided so as to penetrate the partition plate 14 fixed to the outer cylinder 11 and the inner cylinder 12, and the other ends thereof are fixed at predetermined intervals in the circumferential direction of the skin plate 1a. It is connected to the extrusion jacks 17, 17, ....

In the shield machine 2, the tip portion 2b of the skin plate 2a is double formed by a cylindrical outer cylinder 21 and an inner cylinder 22 having the same diameter as that of the first shield machine 1, so that the penetration ring 13 is penetrated. The penetration chamber (cylindrical space) R is formed. A protective ring 36 that is slidable in the tunnel excavation direction is installed in the penetration chamber R. The protection ring 36 is slidable in the penetration chamber R by being formed with a thickness slightly smaller than the dimension between the inner side of the outer cylinder 21 and the outer side of the inner cylinder 22. And inner cylinder 2
A sealing material 37 for stopping water is attached to the surface which slides with respect to 2. Further, the protection ring 36 has a width of sufficient strength so as not to be deformed by the earth pressure applied when the shield machine 2 is propelled, and the front surface thereof has an increased crimpability with the penetration ring 13. Further, an inclined surface 36a is formed to facilitate the intake of the excavated earth and sand. The protective ring 36 is integrated in a ring shape (single unit) so that it can be mounted in the cylindrical penetration chamber R.
However, it may be divided into a plurality of pieces in the circumferential direction. A plurality of rods 38, 38, ... Are attached to the rear surface of the protection ring 36 at predetermined intervals in the circumferential direction. The rod 38 has a partition plate 24 fixed to the outer cylinder 21 and the inner cylinder 22. A reciprocating drive device which is provided so as to pass through and whose end portions are fixed at predetermined intervals in the circumferential direction inside the skin plate 2a, and which causes the protection ring 36 to reciprocate in the penetration chamber R. Jack 39,
39, ... And the partition plate 2
4 is provided with a water-proof measure at a portion where the rod 38 penetrates, and a chemical solution injection pipe 40 for water-stopping is attached at a portion contacting the penetration chamber R. Other configurations of the shield machines 1 and 2 are the same as those shown in the related art.

Next, an underground joining method using the structure of the penetration chamber of the underground joining type shield machine of the present invention will be described.

First, the first method is, as shown in FIG. 1, during normal excavation, the tunnel is excavated in a state where the protection ring 36 is moved to the front part of the penetration chamber R, and the inside of the penetration chamber R is excavated during the excavation. Prevent dirt and gravel from entering. And the shield machine 1,
When the two are brought close to each other by a predetermined distance and joined, as shown in FIG. 2, as the pushing jack 17 is driven to push the penetration ring 13, the protection ring 36 and the reciprocating jack 39 are driven. The penetration ring 13 is gradually penetrated into the penetration chamber R while being pulled into the penetration chamber R and moved. At that time, the water blocking effect can be enhanced by performing the treatment while injecting the chemical liquid into the penetration chamber R from the injection pipe 40.

Next, in the second method, at the time of normal excavation, as shown in FIG. 2, the tunnel is excavated with the protection ring 36 housed inside the penetration chamber R. And the shield machines 1 and 2
When approaching to a predetermined distance for joining, first, the reciprocating jack 39 is driven to push the protection ring 36 forward, so that the earth and sand and the gravel that have entered the penetration chamber R during the excavation are externally exposed. Is discharged to secure the space of the penetration chamber R, and then the protection ring 36 is pulled back into the penetration chamber R, and the penetration ring 13 is inserted into the penetration chamber R to join them. . At that time, as in the first method, the chemical solution is injected into the penetration chamber R.

Therefore, according to the structure of the penetration chamber of the underground joint type shield machine of the present invention, it is possible to prevent clogging of the penetration chamber R with earth and sand and gravel during normal excavation, and the penetration chamber R due to the earth and sand and gravel. Protective ring 36 even if the
By this, the earth and sand and gravel can be discharged from the inside of the penetration chamber R to secure the cylindrical space of the penetration chamber R, and the penetration ring 13 can be smoothly inserted into the penetration chamber R.

Next, the second embodiment will be described with reference to FIG. 3. The structure of this penetration chamber is the same as the protection ring 36 shown in the first embodiment except that the high pressure jet water is supplied from the tip (inclined surface) 36a thereof. The structure is the same as that of the first embodiment.

Therefore, when discharging the earth and sand and the gravel that have blocked the penetration chamber R during excavation with the protection ring 36, the protection ring 36 can be pushed forward while crushing the earth and sand and the gravel with the high-pressure jet water. Moreover, it is possible to reliably discharge the earth and sand and the gravel in the penetration room R. Other functions and effects are the same as those in the first embodiment.

[Advantages of the Invention] As described above, the present invention is a protection ring that is slidably mounted in the tunnel excavation direction between the outer cylinder and the inner cylinder in the penetration chamber, and is a single or a plurality of circumferentially divided protection rings. When,
Since the protection ring is equipped with a drive device that reciprocates in the penetration chamber via the rod, it is possible to prevent dirt, gravel, etc. from entering the penetration chamber, and Even when the penetration chamber is invaded to close the penetration chamber, the soil and gravel can be easily and surely discharged from the penetration chamber, and the penetration ring can be smoothly inserted into the penetration chamber when the shield machine is joined.

[Brief description of drawings]

FIGS. 1 and 2 show a first embodiment of the structure of the penetration chamber of the underground joint type shield machine of the present invention, which shows the vicinity of the penetration ring of the first shield machine and the second shield machine. FIG. 3 is a partial cross-sectional view of the vicinity of the penetration chamber, and FIG. 2 is a cross-sectional view of the penetration ring of the first shield machine and a part of the vicinity of the penetration chamber showing a state where the penetration ring of the second shield machine is penetrated.
FIG. 4 is a view showing a second embodiment of the present invention, a sectional view of a part near the penetration chamber of the second shield machine, and FIGS. 4 to 7 are views showing a conventional technique, and FIG. Is a side sectional view of the first and second shield machines for excavating the ground near the joint,
FIG. 5 is a side sectional view of the first and second shield machines in a state where the cutter device is contracted before joining, and FIG. 6 is a side sectional view of the shield machine showing a state in which the penetration ring is penetrated into the penetration chamber. FIG. 7 is a side sectional view of the tunnel in a state in which the shield machine is disassembled and the tunnel is completed. G ... Ground, Gi ... Tunnel junction ground, 1 ... 1st
Shield machine, 2 ... second shield machine, 1a, 2a
...... Skin plate, 1b, 2b ...... Skin plate tip portion, 11, 21 ...... Outer cylinder, 12, 22 ...... Inner cylinder, 13
...... penetration ring, R ... penetration chamber, 36 ... protection ring,
38 ... Rod, 39 ... Drive device (reciprocating jack).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Miyazawa 2-16-1 Kyobashi, Chuo-ku, Tokyo Within Shimizu Construction Co., Ltd. (72) Inventor Akihiro Honda 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hiroyuki Kubo 2-161-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hisao Arai 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Ken Incorporated Co., Ltd. (72) Inventor Nobuhiro Tsuchiya 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Corporation Incorporated (72) Inventor Takao Nakagawa 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction In-house (72) Inventor Yoshihiko Shimizu 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yoji Toyoji 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Stock Association The inner

Claims (1)

[Claims] 1. A first shield machine in which a front end portion of a skin plate is double formed by an outer cylinder and an inner cylinder, and a penetration ring is housed between the outer cylinder and the inner cylinder. A first shield machine is doubled by an outer cylinder and an inner cylinder having the same diameter as that of the first shield machine to form a penetration chamber into which the penetration ring penetrates. It is a structure of the penetration chamber of the underground junction type shield machine that excavates the tunnel from both sides as a set and joins them in the middle, and is slidable in the tunnel excavation direction between the outer cylinder and the inner cylinder in the penetration chamber. The underground joint type shield machine, which is equipped with a protection ring that is attached to the vehicle and is divided into a plurality of pieces in the circumferential direction, and a drive device that reciprocates the protection ring in the penetration chamber via a rod. The structure of the penetration room.