JP3519060B2 - Slide seal device for shield machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide seal device for a shield machine, in which a shield body has a double-barrel structure and a slide portion is provided between the double-barrels.

[0002]

2. Description of the Related Art Conventionally, shield machines have been used to form tunnels for underpasses and sewers.
In recent years, it has been desired to develop a shield machine capable of long-distance excavation (for example, excavation length: about 10 km) and capable of high-speed construction. As a technology that enables this high-speed construction, there is a simultaneous excavation shield machine that simultaneously constructs a segment and a shield machine.

This simultaneous excavation shield machine has a double-body structure in which the shield body is divided into a front body and a rear body, and a mechanism for sliding back and forth is provided between the front body and the rear body. Then, by assembling the segments on the rear body and advancing the front body, the segment assembly on the rear body and the excavation on the front body can be performed at the same time. When the segment assembly in the rear body and the excavation of the front body are completed, the rear body is advanced to the front body side, and the segment assembly in the rear body and the excavation of the front body are repeated to perform high-speed construction. A slide seal is provided on the slide portion between the front body and the rear body.

5A and 5B are views showing a shield machine having a double-body structure of this type. FIG. 5A is an overall sectional view, and FIG. 5B is an enlarged sectional view of a D portion. As shown in (a), in this shield machine, the shield main body 51 has a double-body structure including a front body 52 and a rear body 53, and a middle bent portion 54 is provided between the front body 52 and the rear body 53. It is provided. A sliding portion is formed between the front body 52 and the rear body 53 of the middle folding portion 54, and a middle folding seal 55 is provided on the middle folding portion 54 by a fitting 56 as shown in FIG. The middle broken seal 55 is a lip seal, and the same structure is used as a slide seal of the simultaneous excavation shield machine.

As another prior art, Japanese Patent Laid-Open No. 10-
There is an invention described in Japanese Patent No. 153082. According to the present invention, the shield body is divided into front and rear parts to be expanded and contracted, and a drive type cutter for scraping earth and sand or the like invading from the ground to the ground side is disposed in an annular cavity formed on the outer periphery of the inner cylinder part.

[0006]

However, when the front barrel 52 is dug simultaneously with the assembling of the segment 57 in the rear barrel 53, as in the above-described simultaneous excavation shield excavator,
Since the sliding stroke between the front body 52 and the rear body 53 is large, the sliding speed is fast, and the number of reciprocations is large, the sliding surface of the sliding portion 55 of the lip seal as shown in FIG. Sediment may enter the seal from inside. When the earth and sand enter in this way, the lip wears and causes a problem in the durability of the sealing material. Also,
Since the sliding speed is high, such a lip seal alone causes early wear of the seal material.

Further, according to the prior art disclosed in the above-mentioned Japanese Patent Laid-Open No. 10-153082, it is difficult to scrape out all the sand and the like that enter the annular cavity, and the seal material in the sliding part is prematurely worn by the entered sand and the like. I will end up.

[0008]

In order to solve the above-mentioned problems, the present invention comprises a shield main body having a double-body structure having a front body and a rear body, and the shield body has a front body and a rear body. A slide part is provided between the slide part and a slide seal that seals between the front body and the rear body when sliding and a dust seal that seals between the rear end of the front body and the rear body. A fluid of a predetermined pressure is supplied to a gap between the front body and the rear body which is sealed by the dust seal and the dust seal. In this way, the shield body has a double-barrel structure, and the seal in the slide part between the front body and the rear body of the double-barrel structure is provided by a slide seal, a dust seal, and a fluid of a predetermined pressure supplied to the gap between them. By configuring, it is possible to prevent the intrusion of earth and sand into the slide seal and the consolidation and sticking of earth and sand at the outer peripheral stepped part at the rear end of the slide part, which can greatly improve the durability of the seal, and to promote long-distance excavation. It is possible to configure a slide seal device capable of handling the above and enabling high-speed construction.

If the pressure of the fluid supplied to the gap is controlled to be higher than the earth pressure from the ground,
The fluid supplied to the gap can be controlled so as to slightly flow out from the dust seal at the rear end to effectively prevent intrusion of earth and sand or the like.

If cleaning fluid is used as the fluid to be supplied to the gap, it is possible to maintain the sealing property of the slide portion by using inexpensive and easy water.

Further, if the cleaning water supplied to the gap is discharged to clean the inside of the gap, even if dirt or the like enters the gap, the cleaning water in the gap is discharged to remove the dirt or the like. Can be discharged from the slide part.

Further, if a cleaning water supply device for discharging and circulating cleaning water supplied to the gap is provided and the cleaning water supply device is provided with a cleaning water filtering function, even if earth and sand enter the gap, It is possible to wash the inside of the gap with circulating wash water and collect and discharge the invading earth and sand.

Further, when the slide seal is composed of a plurality of stages of sealing materials and a slide metal provided between the sealing materials, even if the sealing material at the end is worn by the earth and sand that have entered the gap, A slide metal provided between the sealing materials and a plurality of stages of sealing materials can maintain the sealing performance for a long period of time.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a drawing of a slide seal device showing an embodiment of the present invention, where (a) is a sectional view showing a contracted state and (b) is a sectional view showing an expanded state. 2 is an enlarged cross-sectional view of the A part shown in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the B part.

As shown in FIGS. 1 (a) and 1 (b), the shield body 1 is formed of a compound body structure including a front body 2 and a rear body 3, and the front body 2 and the rear body 3 are connected to each other. The slide portion 4 is provided between the two.

The front body 2 is provided at its rear portion with a slide seal portion 5 and a cover portion 6 extending rearward from the slide seal portion 5. The outer diameter portions of the slide seal portion 5 and the cover portion 6 become the outer diameter portion of the shield body 1.

The rear body 3 has a slide step portion 7 on its front portion.
And a seal step portion 8 extending forward from the slide step portion 7. The reduced state shown in Fig. 1 (a),
The difference from the extended state shown in (b) is the amount of slide for one stroke by which the front body 2 advances.

The slide seal portion 5 of the front body 2 is provided with a slide seal 9 facing inward. As shown in FIG. 2, the slide seal 9 has three-stage sealing material 1
A locking portion 11 that holds 0 is formed, and is configured to hold the mounting portion formed on the base portion of the sealing material 10. The sealing material 10 locked to the locking portion 11 is provided such that the lip 12 at the tip thereof is directed inward in the radial direction and faces the rear body 3 side.

A two-stage slide metal 13 is fixed between these three-stage sealing materials 10 with bolts 14. By this slide metal 13, the locking portion 11
The seal member 10 and the seal member 10 are in direct contact with the seal step portion 8 so as not to receive a load.

Further, before and after the slide seal 9, two stages of scraper seals 15 are fixed by bolts 16. The scraper seals 15 are attached to the front and rear of the slide seal 9 so that the lips face forward and rearward, and the dust and the large amount of dust attached to the seal step portion 8 of the rear body 3 which is the sliding surface of the seal material 10 are attached. It is provided to remove soil and sand.

At the rear end of the cover portion 6, there is provided a dust seal 17 for preventing intrusion of earth and sand from the ground side. This dust seal 17 is, as shown in FIG.
A ring-shaped two-stage sealing material 18 and a ring-shaped leaf spring 19 are attached to the rear end of the cover portion 6 by a retainer 20 fixed with bolts 21. This leaf spring 19
It is provided so as to always come into contact with the slide step portion 7 at a predetermined pressure.

On the other hand, a slide step portion 7 provided on the rear body 3
Is formed with a diameter such that the dust seal 17 provided on the front body 2 can come into contact therewith to exert a sealing function. Further, the seal step portion 8 at the front part thereof is provided with the slide seal 9
When the slide metal 13 is in contact with the seal material 10, the seal material 10 is bent by a predetermined amount and is in contact with the slide metal 13.

Then, in the rear body 3, the shield body 1 is directed toward the annular gap 22 formed between the slide seal 9 and the dust seal 17 in the contracted state shown in FIG. 1 (a). A fluid supply hole 23 and a fluid discharge hole 24 that communicate with the inside are provided. The fluid supply hole 23 and the fluid discharge hole 24 are provided in the seal step portion 8, and a plurality of these fluid supply holes 23 and fluid discharge holes 24 are provided at positions deviated from the positions shown in the drawing in the circumferential direction. In this embodiment, cleaning water is used as the fluid, and the cleaning water 25 flows from the fluid supply hole 23 toward the gap 22.
(Fluid) is supplied and the cleaning water 25 in the gap 22 is discharged from the fluid discharge hole 24.

The pressure of the cleaning water supplied from the fluid supply hole 23 and discharged from the fluid discharge hole 24 is the same as that of the cleaning water supply device 2.
6, and the soil pressure on the side of the natural ground 28 is controlled to be almost the earth pressure or a pressure slightly higher than the earth pressure. By setting the pressure of the cleaning water 25 to be slightly higher than the earth pressure, a small amount of the supplied cleaning water 25 flows out from the dust seal 17 provided at the rear end of the front body 2 to the natural rock 28 side. By doing this, the ground 28 and the gap 22
It is possible to effectively prevent intrusion of earth and sand and the like.

Further, in this embodiment, the cleaning water 25 is circulated by the cleaning water supply device 26, and the cleaning water 25 supplied from the fluid supply hole 23 and discharged from the fluid discharge hole 24 is washed water. It is filtered in the supply device 26 and is supplied again as the cleaning water 25 from the fluid supply hole 23.
By circulating the cleaning water 25 in this manner, the fluid supply hole 23
Since it is only necessary to replenish the washing water 25 that is supplied from the above and flows out to the natural ground side, the amount of washing water can be suppressed as compared with the case where it is always supplied.

In this example, the gap 22 that constantly changes.
Although wash water is used as a fluid that can quickly adjust the supply amount and control the pressure with respect to the volume of this, this fluid may be another fluid, for example, an oil-based fluid such as grease may be used. Good.

FIG. 4 is a sectional view of a shield machine equipped with the slide seal device shown in FIG. As shown,
Shield machine 3 provided with the slide seal device 27
0 has a double-body structure in which the shield body 1 has a front body 2 and a rear body 3.

The front body 2 is provided with a cutter head 31 and a drive motor 32 for turning the cutter head 31. Also, between the front body 2 and the rear body 3,
A slide jack 33 is provided which applies a reaction force to the rear body 3 and advances only the front body 2.

On the other hand, the rear body 3 is provided with an erector 34 for assembling the segment 36 and a shield jack 35 for advancing the rear body 3 by applying a reaction force to the assembled segment 36.

The above-mentioned slide portion 4 is provided between the rear end portion of the front body 2 and the front end portion of the rear body 3, and the slide seal device 27 is provided on the slide portion 4. When the slide seal device 27 is contracted, the outer diameter of the front body 2 forms the outer diameter of the shield machine 30.

According to the slide seal device 27 having the above-described structure, when the segment 36 is assembled by the erector 34 provided on the rear body 3, the front body 2 is dug forward and the slide portion 4 is extended at the same time. , A gap 22 separated by the slide seal 9 and the dust seal 17.
Due to the pressure of the washing water 25 supplied inside the ground 28
It is possible to effectively prevent dirt and sand from entering the gap 22 from the side.

Also, when the assembly of the segment 36 on the rear body 3 is completed and the rear body 3 is moved toward the front body 2 to reduce the slide portion 4, the slide seal 9 and the dust seal 17 separate the same. It is possible to effectively prevent soil and the like from entering the gap 22 from the ground 28 side by the pressure of the cleaning water 25 supplied into the gap 22.

Therefore, it is possible to effectively prevent invasion of earth and sand or the like into the slide seal 9 and stabilize the durability of the seal material 10, so that a shield capable of performing long-distance excavation at high speed. The excavator 30 can be configured.

Even if soil or the like enters the gap 22, the cleaning water 25 in the gap 22 is supplied from the fluid supply hole 23 and discharged from the fluid discharge hole 24. It is possible to prevent the sealing material 10 of the slide seal 9 from being abraded by being discharged from the gap 22 together with the cleaning water 25.

Further, in this embodiment, since the two-stage slide metal 13 is provided between the three-stage seal material 10, the seal material 18 on the dust seal 17 side is provisionally provided.
Even if the sand is worn by invading earth and sand or the like, the intrusion of earth and sand or the like is prevented by the plurality of seal members 10 and the slide metal 13 provided on the slide seal 9. Therefore, even with such arrangement of the seal material 10 and the slide metal 13, it is possible to effectively prevent intrusion of earth and sand or the like and maintain the stable durability of the seal material 10.

In the above-described embodiment, the inward slide seal 9 and the dust seal 17 are provided on the front body 2 side, but the slide seal and the dust seal are provided outward from the rear body 3 side. However, the arrangement of the slide seal 9 and the dust seal 17 is not limited to the embodiment described above.

In the above-described embodiment, the slide seal device 27 provided with the three-stage sealing material 10 is described as an example, but the number of stages of the sealing material 10 is not limited to the above-described embodiment. Further, the slide metal 13 arranged between the sealing materials 10 is not limited to the above-described embodiment.

Furthermore, the above-described embodiment is an embodiment, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

[0039]

The present invention is carried out in the form as described above and has the following effects.

Durability of the seal is greatly improved by preventing intrusion of earth and sand into the slide seal portion between the front body and the rear body of the double-body structure and compaction and adhesion of the earth and sand in the outer peripheral stepped portion of the slide portion. Therefore, it is possible to configure a slide seal device that can cope with long-distance excavation and can perform high-speed construction.

[Brief description of drawings]

FIG. 1 is a drawing of a slide seal device showing an embodiment of the present invention, in which (a) is a sectional view showing a contracted state and (b) is a sectional view showing an expanded state.

FIG. 2 is an enlarged cross-sectional view of part A shown in FIG.

FIG. 3 is an enlarged sectional view of a B part shown in FIG.

4 is a sectional view of a shield machine equipped with the slide seal device shown in FIG. 1. FIG.

5A and 5B are drawings of a shield machine showing an example of a conventional slide seal, FIG. 5A is an overall sectional view, and FIG. 5B is an enlarged sectional view of a D portion.

[Explanation of symbols]

1 ... Shield body 2 ... front torso 3 ... rear torso 4 ... Slide part 5 ... Slide seal part 6 ... Cover 7 ... Slide step 8 ... Seal step 9 ... Slide seal 10 ... Sealing material 11 ... Locking part 12 ... Lip 13 ... Slide metal 14, 16 ... bolts 15 ... scraper seal 17 ... Dust seal 18 ... Sealing material 19 ... Leaf spring 20 ... Presser foot 21 ... Bolt 22 ... Gap 23 ... Fluid supply hole 24 ... Fluid discharge hole 25 ... Wash water 26 ... Cleaning water supply device 27 ... Slide seal device 28 ... Ground 30 ... Shield machine 31 ... Cutter head 32 ... Drive motor 33 ... Slide jack 34 ... Electa 35 ... Shield jack 36 ... Segment

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Shimizu 8 Niijima, Harima-cho, Kako-gun, Hyogo Prefecture Kawasaki Heavy Industries Ltd. Harima Factory (72) Inventor Hiroshi Ishimaru 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-10-153082 (JP, A) JP-A1-125496 (JP, A) JP-A-8-114084 (JP, A) JP-A-53-28928 ( JP, A) Actual development Sho 64-37598 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06

Claims (6)

(57) [Claims] 1. A shield main body having a multi-body structure having a front body and a rear body, a slide portion provided between the front body and the rear body, and the slide portion having the front body and the rear body when sliding. A slide seal for sealing between the cylinders and a dust seal for sealing between the rear cylinder and the rear cylinder at the rear end of the front cylinder are provided, and a predetermined gap is provided between the front cylinder and the rear cylinder sealed by the slide seal and the dust seal. A slide seal device for a shield machine, which is configured to supply a fluid of pressure. 2. The slide seal device for a shield machine according to claim 1, wherein the pressure of the fluid supplied to the gap is controlled to be higher than the earth pressure from the natural ground. 3. The slide seal device for a shield machine according to claim 1, wherein the fluid supplied to the gap is cleaning water. 4. The slide seal device for a shield machine according to claim 3, wherein the cleaning water supplied to the gap is discharged to clean the inside of the gap. 5. A shield excavation according to claim 4, wherein a cleaning water supply device for discharging and circulating cleaning water supplied to the gap is provided, and the cleaning water supply device is provided with a cleaning water filtering function. Slide seal device for machine. 6. The shield machine according to claim 1, wherein the slide seal is composed of a plurality of stages of sealing material and a slide metal provided between the sealing materials. Slide seal device.