JP3205763B2 - Entrance packing of shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a shielding method,
The present invention relates to an entrance packing disposed at a wellhead to prevent infiltration into a pit when a shield machine starts from a starting pit.

[0002]

2. Description of the Related Art A rubber packing made of a rubber plate is usually used as an entrance packing. The rubber packing is arranged around a wellhead, and its tip is brought into contact with the outer periphery of a shield machine or the outer periphery of a segment to stop water. ing.

The rubber packing curves and is pressed against the outer periphery of the shield machine or the outer periphery of the segment, and the excavating shield machine proceeds with the rubber packing being curved as it is spread.

[0004] Although the segment has a slightly smaller outer diameter than the shield machine, the rubber packing on the outer periphery of the segment after passing through the shield machine is less flexible than the contact with the shield machine due to its flexibility. While contacting the outer periphery of the segment.

As described above, in the ordinary circular shield method,
Although both the shield machine and the segment have different diameters, they are both circular, so there is no problem with sealing rubber seals.

In recent years, as shown in FIG. 11, a plurality of circular cutter disks are partially overlapped with each other and are constructed by using a multiple shield machine. Multi-circular shields also exist.

Since the seagull portion 3 which is a dent is present in such a multi-circular shield method, a conventional entrance packing for the seagull portion 3 corresponding to this is shown in FIG.
As shown in (1), an air fence 2 formed by bundling tubular members is disposed outside the rubber packing 1 as a mechanism for pressing the rubber packing 1 against the shield machine and the segment side.

[0008] One end of the air fence 2 is fixed,
The other end is free and pushes the rubber packing 1 inward by a force that tries to straighten by injecting air into the inside from the curved or bent state. In the figure, 4 is an air hose for injecting air into the air fence 2, 5 is a socket at the end thereof, and 6 is a flap hardware.

[0009]

However, since the shape of the shield machine and the segment in the gull portion 3 are different (A in the figure indicates the outer shape of the shield machine, and B indicates the outer shape of the segment). In the conventional entrance packing shown in (1), the shape of the rubber packing 1 is usually determined according to the segment. Therefore, when the skin plate thickness and clearance of the shielding machine are large, the rubber packing 1 is completely adhered to the shielding machine as shown in FIG. Not enough water could not be stopped.

Further, when the seagull portion 3 is pressed by the air fence 2, the bearing pressure of the rubber packing 1 is not sufficient, and this is also a cause of insufficient water stopping. In the case of the air fence 2, since the magnitude of the force to straighten the air hose 4 is not proportional to the enclosed air pressure, it is difficult to control the air pressure to obtain the required force. (The point is that you don't know how much air pressure is enough, so if you apply too much air pressure, it may burst.)

In particular, a large amount of muddy water is spouted at the moment when the contact of the rubber packing 1 is transferred from the shield machine to the segment.

SUMMARY OF THE INVENTION An object of the present invention is to provide an entrance packing of a shield method capable of easily and surely stopping water even in a portion having irregularities such as a seagull portion with a multi-circular shield or another shield having a different diameter. To provide.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a multi-circle shield provided with an entra
The outer metal packing, which is a first rubber packing adapted to the outer peripheral shape of the shield machine and the second rubber packing adapted to the outer peripheral shape of the segment, is attached to the entrance hardware to be built in the wellhead concrete. The front end is sandwiched by the holding plate and attached, and the entrance hardware has a concave part that protrudes outward on the back side of the vertical plate part, and a baffle plate that protrudes in the center is set in the concave part
Fix the left and right ends in this recess and straddle the baffle plate
Thus, the gist is to arrange a plurality of airbags outside the rubber packing as a pressing mechanism for the rubber packing.

According to the first aspect of the present invention, since a plurality of rubber packings are used, any one of the rubber packings comes into close contact with each of the shield machine and the segment.
When moving from the shield machine to the segment, water can be stopped at two or more places, so reliable water stopping can be achieved.

Further, since an air bag is used as a pressing mechanism for these rubber packings, the air pressure and the pressing force are proportional to each other, and as compared with an air fence, a reliable pressing such that the rubber packing is always pressed with an air pressure higher than the muddy water pressure. Can manage.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view of a main part showing an embodiment of an entrance packing of the shield method according to the present invention, and FIG. 2 is a front view of the whole of the same.

As the entrance packing provided in the seagull portion of the multi-circular shield, an entrance metal piece 7 to be built in wellhead concrete, an inner rubber packing 8 as a first rubber packing conforming to the outer shape A of the shield machine, and an outer shape of the segment. The outer rubber packing 9, which is the second rubber packing matched to B, is overlapped, and the end is sandwiched by the holding plate 10 and attached. The outer rubber packing 9 is a single sheet or a plurality of sheets.

Further, a flap metal member 11 is attached to an end of the holding plate 10 by hinge connection, and this is attached to the front side of the outer rubber packing 9.

On the other hand, the entrance metal member 7 has a concave portion 12 projecting outward on the inner side of the vertical plate portion, and a plurality of airbags 13 are arranged in this portion so as to fix both left and right ends. The airbag 13 is provided with the inner rubber packing 8.
The outer rubber packing 9 is disposed outside these as a pressing mechanism. In the figure, reference numeral 18 denotes an air hose, which is connected via a socket, a valve, a nipple, a reducer, and the like.

In this embodiment, the recess 12 is provided with a baffle plate 19 projecting in the center, and the air bag 13 is disposed so as to straddle the baffle plate 19 so that the air bag 13 always expands toward the rubber packing. I do.

An opening is provided in the vertical plate portion of the entrance metal member 7. A socket 5 is provided in a closing plate 14 for the opening, and an air hose 4 from the socket 5 is provided.
Was connected to the airbag 13.

FIG. 9 is a piping diagram of air supply to the socket 5. The compressor 15 has a receiver tank 16 connected thereto, the receiver tank 16 has a flow divider 17 connected thereto, and the distributor 15 has a socket 5 connected thereto. Via airbag 13
Is connected. The reason why the receiver tank 16 is interposed in this way is to store air in the receiver tank 16 in order to shorten the time for inflating the airbag 13. This makes it possible to cope with a case where rapid inflation is required, such as when moving from a shield machine to a segment, and the amount of water is reduced.

As an assembling method, first, the entrance hardware 7 is erected in the wellhead concrete, the inner rubber packing 8 is attached, the outer rubber packing 9 is attached, and the inner rubber packing 8 and the outer rubber packing 9 are fixed by the holding plate 10. Tighten it by sandwiching it in the entrance hardware 7, attach the flap hardware 11, attach the airbag 13,
Connect the air hose 4 to the air bag 13,
Complete with the lid.

Next, usage and operation will be described.
5 to 7 are longitudinal side views of each process, and FIGS. 3 and 4 are front views. As shown in FIGS. 3 and 5, when the shield machine is inserted, an inner rubber packing is formed on the outer peripheral shape A of the shield machine. A large number of tips of 8 come into contact with each other, and water is stopped here. In this case, the airbag 13 is not so inflated.

As shown in FIG. 6, at the moment when the segment is changed from the shield machine to the segment, the tip of the outer rubber packing 9 also comes into contact with the outer peripheral shape B of the segment.
In this way, water is stopped by both the shield machine and the segment.

Further, as shown in FIG. 7, if the air bag 13 is further inflated on the outer surface of the segment, the air bag 13 abuts not only on the outer rubber packing 9 but also on the inner rubber packing 8. Is made.

In the air bag 13, as shown in FIG. 10, the air pressure and the holding force are proportional. This is because the holding force of the conventional air fence 2 (see FIG. 12) is not only the air pressure but also the shape and deformation performance of the fence itself. Is not proportional because of influence (non-linear)
Is different.

As a result, in the air fence 2, the required pressure can be known only when the air pressure is increased and the water stops, whereas in the air bag 13, if the air pressure is higher than the water pressure with respect to the water pressure, the air pressure is increased. Since the back 13 is always inflated, the rubber packing can be brought into close contact with the bag, so that air pressure management is easy.

When the water pressure fluctuates, for example, when the water pressure rises in the air fence 2, the only way to adjust it is to increase the air pressure. There is no problem.

In the above-described embodiment, the case of the entrance packing provided at the seagull portion of the multi-circular shield has been described. First, it can be applied to shields of various shapes having different diameters.

[0031]

As described above, the entrance packing of the shield method according to the present invention can easily and reliably stop water even in a portion having irregularities such as a seagull portion with a multi-circular shield or other different-diameter shields. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing one embodiment of an entrance packing by a shield method according to the present invention.

FIG. 2 is an overall front view showing an embodiment of an entrance packing by a shield method according to the present invention.

FIG. 3 is a front view of a first step showing a use state of an entrance packing of the shield method according to the present invention.

FIG. 4 is a front view of a subsequent step showing a use state of the entrance packing of the shield method according to the present invention.

FIG. 5 is a vertical sectional side view of a first step showing a use state of the entrance packing of the shield method according to the present invention.

FIG. 6 is a vertical sectional side view of a second step showing a use state of the entrance packing of the shield method according to the present invention.

FIG. 7 is a vertical sectional side view of a third step showing a use state of the entrance packing of the shield method according to the present invention.

FIG. 8 is an explanatory view showing a contact state of a rubber packing in the present invention.

FIG. 9 is a supply piping diagram showing an air supply system to an airbag.

FIG. 10 is a correlation diagram between the air pressure enclosed by the airbag and the air fence and the holding force.

FIG. 11 is an outer diameter view of the multi-circular shield.

FIG. 12 is a vertical sectional side view of a conventional entrance packing.

FIG. 13 is an explanatory view showing a contact state of a rubber packing of a conventional entrance packing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rubber packing 2 ... Air fence 3 ... Seagull part 4 ... Air hose 5 ... Socket 6 ... Flap hardware 7 ... Entrance metal fitting 8 ... Inner rubber packing 9 ... Outer rubber packing 10 ... Holding plate 11 ... Flap hardware 12 ... Recess 13 ... Air bag 14… Blocking plate 15… Compressor 16… Receiver tank 17… Diverter 18… Air hose 19… Baffle plate

──────────────────────────────────────────────────続 き Continuing on the front page (73) Patent holder 595141524 Kurodatech Co., Ltd. 1-19-3 Minamiseidai, Katano-shi, Osaka (72) Inventor Akio Ueda 3--15, Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. In the Kansai Branch of the Company (72) Inventor Tetsuya Okamoto 1-3-15 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd.In the Kansai Branch (72) Isao Yamada 1-3-15, Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Shojiro Shimokawa 1-3-15 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Kojiro Ikeda 4-chome, Honcho, Chuo-ku, Osaka-shi, Osaka No. 1-13 Takenaka Civil Engineering Co., Ltd. (72) Inventor Tsutomu Tomizawa 1-24-4 Shinkawa, Chuo-ku, Tokyo Inside Daitoyo Construction Co., Ltd. (72) Inventor Toshige Kishio 3-15 Minami-Aobadai, Kawachinagano-shi, Osaka (72) Inventor Kuroda Tech Co., Ltd. -20 795 (JP, A) Fully open 1986-45492 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (1)

(57) [Claims] An end provided in a seagull portion of a multicircular shield.
As the transformer packing, an entrance metal built in wellhead concrete is provided with an inner rubber packing which is a first rubber packing adapted to the outer peripheral shape of the shield machine and an outer rubber packing which is a second rubber packing adapted to the outer peripheral shape of the segment. The entrance metal fittings are sandwiched between the holding plates, and the entrance hardware has a concave part that protrudes outward on the back side of the vertical plate part, and a baffle plate that protrudes to the center in the concave part
Are provided, and the left and right ends are fixed in the concave portions, and the baffle plate is
An entrance packing according to a shield method, wherein a plurality of airbags are disposed outside the rubber packing so as to straddle them as a pressing mechanism for the rubber packing.