JP2520807Y2 - Jack for shield method - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an improvement of a jack for a shield construction method.

[0002]

2. Description of the Related Art Conventionally, in the construction work of large-scale sewage pipes, etc., due to environmental problems in the surroundings, a shield construction method is often adopted in which a pipe line is formed while excavating the ground as it is. In this shield construction method, a secondary lining may be performed inside the primary lining and then a pipe having a required pipe diameter may be piped.

By the way, in the above-mentioned shield construction method, when the secondary lining is carried out after the primary lining, the outer diameter of the pipe used in the secondary lining is as large as possible because the effective diameter of the pipeline is required to be large. It is preferable to use an air jack or a water pressure jack that can be expanded and contracted by using the pressure of air or liquid as a jig for supporting the pipe for secondary lining and can be inserted even in a narrow gap. Insertion is performed between the inner surface of the lining and the outer surface of the secondary lining pipe.

[0004]

However, although the above-mentioned conventional air jack or hydraulic jack can be moved along the inner surface of the primary lining, the contact portion with the outer surface of the secondary lining pipe does not move relatively. Since it was not possible, after inflating and supporting the secondary lining pipe, it becomes impossible to move the pipe,
In some cases, it may be very difficult to adjust the fine movement when the pipe is installed, and when it is contracted after use and pulled off, the pulling resistance increases due to contact friction with the outer surface of the secondary lining pipe.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a jack for a shield construction method in which the secondary lining pipe can be moved minutely and the movement operation during pulling out is easy. It was done for the purpose.

[0006]

That is, the jack for the shield construction method of the present invention has a sled body which is movable on the inner surface of the pipe line of the primary lining along the axial direction of the pipe line. A frame having a roller that abuts along the outer surface of the conduit is attached to the sled body surface so that it can move in parallel only in the vertical direction, and expansion and contraction between the frame and the sled body surface is possible. It is characterized in that a bag is inserted.

[0007]

EXAMPLES The present invention will be described below with reference to examples. FIG.
Is a side view of the embodiment of the present invention, FIG. 2 is a plan view of the embodiment,
FIG. 3 is a side view of the embodiment when contracted, and FIG. 4 is a cross-sectional view showing a usage state of the embodiment.

The jack 1 for the shield construction method of this invention is
On the inner surface of the pipe line P (FIG. 4) of the primary lining, the sled body 2 movable along the axial direction of the pipe line P, and the pipe line Q of the secondary lining
(FIG. 4) A frame 4 having rollers 3 ... expansion,
A retractable elastic bag 5 is inserted and configured.
In the figure, reference numeral 6 denotes a link connecting the frame 4 and the sled body 2, and the metal fittings 6A ... 6 welded to the frame 4 and the sled body 2 respectively.
A and a wire rope 6B connecting between the receiving metal fittings 6A ... 6A. Reference numerals 5A and 5B denote pipes for injecting and discharging the elastic bag 5.

[0009]

[Operation] In the shield method, when performing secondary lining,
As shown in FIG. 4, the sled body 2 is arranged along the inner surface of the primary lining P, and the pipe 7 for secondary lining is placed on the main carrier 8 to inflate the expandable bag 5 after positioning. . Along with this expansion, the frame 4 gradually moves upward to support the pipe 7 for secondary lining in the primary lining as shown in FIG.

In this state, the pipe 7 is supported by the shield construction jack 1. Since the rollers 3 ... 3 are interposed between the frame 4 and the secondary lining pipe 7, fine movement at the time of connection is facilitated by the rollers 3. When positioning is performed and fixing of the secondary lining pipe 7 is completed, the expandable bag 5 is contracted to release the supporting state, and the frame 4 is fitted along the surface of the sled body 2 as shown in FIG. Even in the narrow gap between the primary lining P and the secondary lining Q, it is possible to freely draw out.

[0011]

As described above, according to the present invention, when the pipe for the secondary lining is carried into the primary lining, the frame with the roller is moved up and down by the telescopic bag and the roller for the secondary lining is operated by the roller. Since the pipe is supported, the pipe for the secondary lining can be moved very easily. Further, the jack for the shield construction method of the present invention has various practical effects such that it is easy to implement because of its simple structure.

[0012]

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a plan view of an embodiment of the present invention.

FIG. 3 is a side view of the embodiment of the present invention when expanded and contracted.

FIG. 4 is a sectional view showing a usage state of the embodiment of the present invention.

[Explanation of symbols]

 1 Jack for shield method 2 Sled body 3 Roller 4 Frame 5 Telescopic bag

Claims (1)

(57) [Scope of utility model registration request] 1. A frame having a roller, which is in contact with an inner surface of a pipe line of a primary lining along the axial direction of the pipe line, and a roller that abuts along an outer surface of the pipe line of the secondary lining. For a shield construction method, which is mounted so as to be movable in parallel only in the vertical direction with respect to the sled body surface, and an expandable and contractible expandable bag is interposed between the frame and the sled body surface. jack. [0001]