JP2002357080A - Sliding sealing device for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a lip is abraded by soil and sand penetrated into a seal and the durability of a sealing material is deteriorated in a sliding section having a large sliding stroke, quick sliding speed and further a large number of reciprocation numbers. SOLUTION: A shield body 1 is composed of a double-drum structure with a front drum 2 and a rear drum 3, the sliding section 4 is installed between the front drum 2 and the rear drum 3, and the sliding seal 9 sealing a section between the front drum 2 and the rear drum 3 in the case of a sliding and the dust seal 17 sealing the front drum 2 and the rear drum 3 at the rear end of the front drum 2 are mounted on the sliding section 4. The shield body is constituted so that an opening 22 between the front drum 2 and the rear drum 3 sealed with the sliding seal 9 and the dust seal 17 is supplied with washing water 25 at a fixed pressure, and the durability of the seals is improved by preventing the penetration of soil and sand to the sliding seal 9 and the consolidation and fixing of soil and sand at an outer-circumferential stepped section at the rear end of the sliding section 4.

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 body structure and a slide portion is provided between the two bodies.

[0002]

2. Description of the Related Art Conventionally, shield excavators have been used to form tunnels such as underpasses and sewers.
In recent years, there has been a demand for the development of a shield excavator capable of long 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 excavator that simultaneously assembles segments and excavates a shield excavator.

[0003] This simultaneous excavating shield excavator has a double body structure in which a 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 with the rear body and excavating the front body, it is possible to simultaneously construct the segments with the rear body and excavate the front body. When the segment assembly at the rear trunk and the excavation of the front trunk are completed, the rear trunk is advanced to the front trunk side, and the segment assembly at the rear trunk and the excavation of the front trunk are repeated to perform high-speed construction. A slide seal is provided on a slide portion between the front trunk and the rear trunk.

FIGS. 5A and 5B are drawings showing a shield machine of this type having a double-barrel structure, wherein FIG. 5A is an overall sectional view and FIG. As shown in (a), in this shield excavator, the shield body 51 has a double body structure including a front body 52 and a rear body 53, and a bent portion 54 is formed between the front body 52 and the rear body 53. It is provided. A part between the front trunk 52 and the rear trunk 53 of the center bent part 54 serves as a slide part. As shown in FIG. The middle bend seal 55 is a lip seal, and the same structure is used as a slide seal of the simultaneous excavation shield excavator.

[0005] As another prior art, Japanese Patent Application Laid-Open No.
There is an invention described in Japanese Patent No. 153082. In this invention, the shield main body is divided into front and rear portions to expand and contract, and a driving cutter for scraping soil and the like intruding from the ground to the ground side is disposed in an annular cavity formed on the outer periphery of the inner cylinder portion.

[0006]

However, when the front body 52 is excavated at the same time as the assembly of the segment 57 in the rear body 53 as in the simultaneous excavation shield machine described above,
Since the sliding stroke between the front body 52 and the rear body 53 is large, the sliding speed is high, and the number of reciprocations is large, the sliding surface of the sliding portion 55 in the lip seal as shown in FIG. From the soil may enter the seal. When earth and sand enter in this way, the lip is worn and a problem occurs in the durability of the sealing material. Also,
Since the sliding speed is high, only such a lip seal causes early wear of the sealing material.

Further, in the prior art described in the above-mentioned Japanese Patent Application Laid-Open No. H10-153082, it is difficult to scrape all the earth and the like entering the annular cavity portion. I will.

[0008]

In order to solve the above-mentioned problems, the present invention provides a shield body having a double body structure having a front body and a rear body. A slide seal provided between the front body and the rear body when sliding, and a dust seal provided between the rear end of the front body and the rear body at the rear end of the slide body. A fluid at a predetermined pressure is supplied to a gap between the front body and the rear body sealed with a dust seal. In this manner, the shield body has a double body structure, and a seal at a slide portion between the front body and the rear body of the double body structure is formed by a slide seal, a dust seal, and a fluid of a predetermined pressure supplied to a gap therebetween. With this configuration, it is possible to prevent the intrusion of earth and sand into the slide seal and the consolidation and fixation of the earth and sand at the outer stepped portion at the rear end of the slide part, greatly improving the durability of the seal, and enabling long distance excavation And a slide seal device capable of 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,
By controlling the fluid supplied to the gap to slightly flow out from the dust seal at the rear end, intrusion of earth and sand can be effectively prevented.

Further, if the fluid supplied to the gap is cleaning water, it is possible to maintain the sealing property of the slide portion by using inexpensive water which is easy to supply.

Furthermore, if the inside of the gap is washed by discharging the washing water supplied to the gap, even if soil or the like enters the gap, the washing water in the gap is discharged to discharge the soil or the like. Can be discharged from the slide portion.

Further, if a washing water supply device for discharging and circulating washing water to be supplied to the gap is provided, and the washing water supply device is provided with a washing water filtering function, even if soil or the like enters the gap, The inside of the gap can be washed with the circulating washing water, and the infiltrated earth and sand can be collected and discharged.

Further, if the slide seal is composed of a plurality of seal members and a slide metal provided between the seal members, even if the seal member at the end is worn by earth and sand that has entered the gap, The sealability can be maintained for a long time by the slide metal provided between the seal members and the plurality of seal members.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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, in which (a) is a sectional view showing a contracted state, and (b) is a sectional view showing an extended state. FIG. 2 is an enlarged sectional view of the portion A shown in FIG. 1, and FIG. 3 is an enlarged sectional view of the portion B shown in FIG.

As shown in FIGS. 1 (a) and 1 (b), the shield main body 1 is formed in a double body structure including a front body 2 and a rear body 3; A 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 portion of the slide seal portion 5 and the cover portion 6 becomes the outer diameter portion of the shield body 1.

The rear body 3 has a slide step 7 at its front.
And a seal step 8 extending forward from the slide step 7. The reduced state shown in FIG.
The difference from the extended state shown in (b) is the slide amount for one stroke that the front trunk 2 excavates.

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 a three-stage seal material 1.
0 is formed, and is configured to hold a mounting portion formed at the base of the sealing material 10. The sealing material 10 locked by the locking portion 11 is provided such that the lip 12 at the distal end faces inward in the radial direction and faces the rear trunk 3 side.

A two-stage slide metal 13 is fixed between the three-stage seal members 10 with bolts 14. The locking portion 11 is formed by the slide metal 13.
The seal member 10 is in direct contact with the seal step 8 so as not to receive a load.

Further, before and after the slide seal 9, two-stage scraper seals 15 are fixed by bolts 16. The scraper seal 15 is attached to the front and rear of the slide seal 9 so that the lip faces forward and rearward. It is provided to remove earth and sand.

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

On the other hand, a slide step 7 provided on the rear body 3
Is formed to have a diameter such that the dust seal 17 provided on the front body 2 can come into contact with the dust seal 17 and exert a sealing function. The seal step 8 at the front of the slide seal 9
The seal metal 10 is formed to have such a diameter that a sealing function can be exerted by being bent and contacted by a predetermined amount in a state where the slide metal 13 is in contact therewith.

In the rear trunk 3, the shield body 1 is moved toward the annular gap 22 formed between the slide seal 9 and the dust seal 17 in the reduced state shown in FIG. A fluid supply hole 23 and a fluid discharge hole 24 communicating 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 fluid supply holes 23 and a plurality of fluid discharge holes 24 are provided at positions shifted in the circumferential direction from the position shown in the figure. In this embodiment, the cleaning water is used as the fluid, and the cleaning water 25 flows from the fluid supply hole 23 toward the gap 22.
(Fluid), and the cleaning water 25 in the gap 22 is discharged from the fluid discharge hole 24.

The pressure of the washing water supplied from the fluid supply hole 23 and discharged from the fluid discharge hole 24 is controlled by the cleaning water supply device 2.
The pressure is controlled to be approximately the earth pressure on the ground 28 side or slightly higher than the earth pressure. By setting the pressure of the washing water 25 slightly higher than the earth pressure, a small amount of the supplied washing water 25 flows out from the dust seal 17 provided at the rear end of the front body 2 to the ground 28 side. In this case, the ground 22 and the gap 22
It is possible to effectively prevent soil and the like from entering the surface.

In this embodiment, the cleaning water 25 is circulated by the cleaning water supply device 26. The cleaning water 25 supplied from the fluid supply hole 23 and discharged from the fluid discharge hole 24 is used as the cleaning water. The water is filtered in the supply device 26 and supplied again as the cleaning water 25 from the fluid supply hole 23.
By circulating the washing water 25 in this manner, the fluid supply holes 23
It is only necessary to replenish the washing water 25 that has been supplied from the plant and flowed out to the ground side, so that the amount of washing water can be suppressed as compared with the case where the washing water 25 is always supplied.

In this example, the gap 22 that constantly changes is
Washing water is used as a fluid capable of quickly adjusting the supply amount and controlling the pressure with respect to the volume of the fluid, but this fluid may be another fluid, such as an oil-based fluid such as grease. Good.

FIG. 4 is a sectional view of a shield machine provided with the slide seal device shown in FIG. As shown
The shield machine 3 provided with the slide seal device 27
Reference numeral 0 denotes 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 rotating the cutter head 31. Also, between the front trunk 2 and the rear trunk 3,
A slide jack 33 is provided for excavating only the front body 2 by taking a reaction force on the rear body 3.

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

The slide portion 4 described above is provided between the rear end of the front body 2 and the front end 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 in a contracted state, the outer diameter of the front body 2 forms the outer diameter of the shield machine 30.

According to the slide seal device 27 constructed as described above, while the segments 36 are assembled by the erectors 34 provided on the rear body 3, the front body 2 is excavated to extend the slide portion 4 at the time of simultaneous construction. , A gap 22 defined by the slide seal 9 and the dust seal 17
Due to the pressure of the washing water 25 supplied to the ground 28
It is possible to effectively prevent soil and the like from entering the gap 22 from the side.

Also, when the assembly of the segments 36 in the rear trunk 3 is completed and the slide part 4 is reduced by moving the rear trunk 3 toward the front trunk 2, the slide seal 9 is separated from the dust seal 17. It is possible to effectively prevent soil and the like from entering the gap 22 from the ground 28 due to the pressure of the washing water 25 supplied into the gap 22.

Therefore, the intrusion of earth and sand into the slide seal 9 can be effectively prevented, and the durability of the sealing material 10 can be stabilized, so that a shield capable of performing long-distance excavation at high speed. An excavator 30 can be configured.

Even if soil or the like enters the gap 22, the washing 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 worn out together with the cleaning water 25 from the gap 22 and being worn.

Further, in this embodiment, two stages of the slide metal 13 are provided between the three stages of the seal members 10.
Even if is worn by the intruding earth or the like, the intrusion of the earth and 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 an arrangement of the seal member 10 and the slide metal 13, it is possible to effectively prevent intrusion of earth and sand and the like, and to maintain stable durability of the seal member 10.

In the above 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. The arrangement of the slide seal 9 and the dust seal 17 is not limited to the above-described embodiment.

In the above-described embodiment, the slide seal device 27 provided with the three-stage seal member 10 has been described as an example. However, the number of stages of the seal member 10 is not limited to the above-described embodiment. Further, the slide metal 13 disposed between the sealing members 10 is not limited to the above-described embodiment.

Further, the above-described embodiment is one embodiment, and various changes 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 embodied in the form described above, and has the following effects.

The durability of the seal is greatly improved by preventing the intrusion of earth and sand into the slide seal portion between the front and rear bodies of the double-body structure and the consolidation and fixation of the earth and sand at the outer stepped portion of the slide portion. Therefore, it is possible to configure a slide seal device capable of coping with long-distance excavation and high-speed construction.

[Brief description of the 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 extended state.

FIG. 2 is an enlarged sectional view of a portion A shown in FIG.

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shield main body 2 ... Front trunk 3 ... Rear trunk 4 ... Slide part 5 ... Slide seal part 6 ... Cover part 7 ... Slide step part 8 ... Seal step part 9 ... Slide seal 10 ... Seal material 11 ... Locking part 12 ... Lip 13 ... Slide metal 14, 16 ... Bolt 15 ... Scraper seal 17 ... Dust seal 18 ... Seal material 19 ... Leaf spring 20 ... Holder 21 ... Bolt 22 ... Gap 23 ... Fluid supply hole 24 ... Fluid discharge hole 25 ... Washing water 26 ... Washing water supply device 27 ... Slide seal device 28 ... Soil pile 30 ... Shield excavator 31 ... Cutter head 32 ... Drive motor 33 ... Slide jack 34 ... Electr 35 ... Shield jack 36 ... Segment

Continuing on the front page (72) Inventor Masanori Watanabe 8 Harima-cho, Harima-cho, Kako-gun, Hyogo Kawasaki Heavy Industries, Ltd. In Harima Plant (72) Inventor Hiroshi Ishimaru 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. F-term (reference) 2D054 AC02 AD02 AD03 BA03 3J006 AB08 3J043 AA11 BA04 BA08 BA09 CA02 CA04 DA03 DA06 HA03

Claims (6)

[Claims] 1. A shield body having a double body structure having a front body and a rear body, a slide part provided between the front body and the rear body, and the slide part is provided between the front body and the rear part when sliding. A slide seal that seals between the bodies and a dust seal that seals between the rear body at the rear end of the front body are provided in a gap between the front body and the rear body sealed with the slide seal and the dust seal. A slide seal device for a shield machine configured to supply pressure fluid. 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 ground. 3. The slide seal device for a shield machine according to claim 1, wherein the fluid supplied to the gap is washing 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. The shield excavating device according to claim 4, wherein a cleaning water supply device for discharging and circulating the cleaning water supplied to the gap is provided, and the cleaning water supply device is provided with a cleaning water filtration function. Machine slide seal device. 6. The shield machine according to claim 1, wherein the slide seal comprises a plurality of seal members and a slide metal provided between the seal members. Slide seal device.