JPS59102084A - Shield machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield machine used in a shield construction method, and a shield machine used in an enlarged shield construction method for excavating a local enlarged tunnel section in a part of a pre-formed tunnel. Regarding the expansion shield machine (hereinafter referred to as the expansion shield machine),
In particular, the present invention relates to a shield machine that can reliably prevent the intrusion of earth and sand, and that can also provide a sufficient sealing function when used in conjunction with mud excavation.

Conventionally, a shield machine consists of a cylindrical shield and a jack that obtains a reaction force from a segment mounted in a tunnel to propel the shield.

With this conventional shield machine, there is a problem that during excavation work, earth and sand enters the shield from between the shield and the segments, interfering with the work.

A similar problem exists with the magnifying shield machine mentioned above.

As stated in several of the applicant's previous applications describing this enlarged shield machine, a It consists of a cylindrical shield that excavates an expanding tunnel, and a jack that propels the shield by obtaining a reaction force from a secondary segment attached to the inner surface of the expanding tunnel. This expansion shield machine has the advantage of streamlining construction work and significantly reducing construction costs compared to conventional construction methods for enlarging a portion of a tunnel. However, as mentioned above, there is a risk of dirt entering between the shield and the primary or secondary segment. ! When excavating an enlarged tunnel, there is a particular problem in that the sealing between the primary segment and the shield must be taken into account.

Based on these problems, the present invention provides a shield machine that can reliably prevent earth and sand from entering the shield between the segments and the shield, and can also provide a sufficient sealing function especially when used in combination with muddy water excavation. The purpose is to provide

In accordance with this object, the gist of the present invention is to provide a sealing member on the surface portion of the shield that is in sliding contact with the segment to seal between the surface portion and the surface of the segment.

The present invention will be described below based on embodiments shown in the drawings.

1 and 2 show an example of an enlarged shield machine as an embodiment of the present invention.

This shield machine A includes a cylindrical shield 2 disposed around the outer circumference of a primary segment L forming a small diameter tunnel TI, and excavating an enlarged tunnel T2 around the primary segment; The shield 2 is provided with a jack 4 that propels the shield 2 by obtaining a reaction force from the secondary segment 3 attached to the inner surface of the T2.

A partition wall 5 for extruding earth and sand is provided inside the front end of the shield 2, and a mud water inlet pipe 6 and a mud water outlet pipe 7 are attached to the partition wall 5. Incidentally, instead of these partition walls 5 and pipes 6 and 7, or together with them, a face crushing bag # (not shown) made of a known rotary cutter, screw auger, etc. may be provided on the front side thereof. You can also do it. Furthermore, if the face is soft, only the partition wall 5 having a soil outlet can be used.

Furthermore, according to one aspect of the present invention, as shown in FIGS. 2 to 4, a cylindrical portion 8 facing the outer surface of the primary segment l is provided inside the shield 2 integrally with the shield 2, and the cylindrical portion 8 and A rubber inner seal 9, which is a sealing member that seals between the outer surfaces of the primary segment 1, and an air bag-shaped backer 10 are provided on the surface of the inner cylinder portion 8. The inner seal 9 is provided with a stopper 11 that suppresses the backer lO, and the packer 10 allows air to be taken in and taken out.

Note that instead of the packer 10, a plurality of inner seals 9 are provided as shown in FIG.
It is also possible to load 2.

In addition, inner seal 9, bunker 10 and grease 1
The second sealing member is not limited to between the inner cylinder part 8 and the primary segment 1, but is also provided between the inner surface of the rear end of the shield 2 and the inner surface of the shield 2 as shown in FIG.
It can also be provided on the inner surface of the shield 2 between the outer surfaces of the next segment 3.

To excavate the enlarged tunnel T2 using the above device A,
The device A was placed at the starting end of the enlarged tunnel T2 by an arbitrary method, and while muddy water was injected from the muddy water inlet pipe 6, the partition wall 5 was formed together with the shield 2. While the crushing device was operated, the jack 4 The shield 2 is propelled to excavate an enlarged tunnel T2 around the small diameter tunnel T1. It goes without saying that as the excavation progresses, the primary segment 1 is removed and the secondary segments 3 are sequentially installed using a known erector (not shown).

Furthermore, in the present invention, since the shield 2 and the primary segment 1 or the secondary segment 3 are sealed with the sealing member 9° 10.12, it is possible to reliably prevent dirt from entering the shield 2, and as described above. When mud excavation is used in combination with this method, it is particularly easy to obtain the desired sealing function, and the excavation work can be made more efficient. Furthermore, even when the mud excavation method is not used in combination, it is possible to prevent the unwanted intrusion of the face and earth and sand, as described above, and to perform the construction work smoothly and safely.

Further, in the above embodiment, the expansion shield machine A was explained, but in the case of a normal shield machine, there is a seal member 9 that seals between the shield 2 and the secondary segment 3. IO,1
This corresponds to the case where 2 is provided.

Similarly, the intrusion of earth and sand can be reliably prevented.

As described above, according to the present invention, the shield and the primary or secondary
Since it is equipped with a sealing member that seals between the next segments, it reliably prevents earth and sand from entering the shield, making it easier to use the mud excavation method in combination, and making construction work more efficient and safe. is obtained.

[Brief explanation of drawings]

1 is a partially sectional front view of an expanding shield machine according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line nn of FIG. 1, and FIG.
4 is an enlarged view of the main part of FIG. 3, and FIG. 5 is an enlarged view of the main part showing a modification of FIG. 4. A... Expanding shield machine 1-. Primary segment 2: Shield 3: Secondary segment 4: Jacket 5: Partition wall 6: Muddy water inlet pipe 7: Muddy water outlet pipe 8: Inner cylinder 9: Inner rule 0: Packer 11...stopper】2...
・Grease TI・Small diameter i・Nunnel T2・・Enlarged tunnel. Patent applicant Mitsui Construction Co., Ltd.

Claims (1)

[Claims] (1) In a shield machine consisting of a cylindrical shield and a jack that obtains a reaction force from a segment to propel the shield, on the surface portion of the shield that slides into contact with the segment. A shielding machine characterized in that a sealing member is provided to seal between the surface portion and the surface of the segment. +21 A cylindrical shield disposed around the outer periphery of a primary segment forming a small diameter tunnel and excavating an enlarged tunnel around the primary segment, and a secondary segment attached to the inner surface of the enlarged tunnel. In a shield machine comprising a jack that propels the shield by obtaining a reaction force, a surface portion of the shield that slides into contact with the primary or secondary segment. 2. The shielding machine according to claim 1, further comprising a sealing member for sealing between said surface portion and the surface of said primary or secondary segment. (A partition wall for extruding earth and sand is installed inside the 31 shield,
3. The enlarged shield drilling apparatus according to claim 2, wherein the partition wall is provided with a muddy water inlet and a muddy water outlet. (41) The enlarged shield excavation device according to claim 3, characterized in that a crushing device such as a screw auger or a rotary cutter is provided on the front side of the partition wall in the direction of movement.