JP2501072Y2 - Shield pressure machine for shield machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a gable frame pressurizing device in a shield machine with a cast-in-place lining method.

[Prior Art] Conventionally, in a cast-in-place lining method, in order to improve the self-supporting property and water-stopping property of a gable part which is a splicing surface of lining concrete, the cast concrete is pressurized and dehydrated by gable frame pressure. Is known to be effective, and therefore, JP-A-63-161299, JP-A-63-181894, and JP-A-63-163894
As disclosed in JP-A-265099 and Japanese Patent Laid-Open No. 1-247698, a dedicated gable frame pressurizing equipment for pressurizing the grate frame is installed in the shield machine body separately from the propulsion jack for propulsing the shield machine. Many are arranged. This is because the poured concrete is always affected by the earth pressure, water pressure, unevenness of the ground, ground reaction force, etc. that acts on the tunnel lining body, the gable frame tilts, and the concrete dehydration is circular. From the viewpoint of avoiding differences in concrete strength due to different dehydration amounts at the top and bottom of the tunnel, which are not performed uniformly on the circumference, a large number of jack-frame pressurizing jacks are arranged and the gable frame is covered over the entire circumference. This is because the pressure is applied uniformly.

[Problems to be solved by the device]

As described above, in the above-mentioned conventional technique, the device dedicated to the endless frame pressurization,
For example, since a jack frame pressurizing jack is installed on the shield machine main body, the grate frame, etc., the hydraulic equipment and hydraulic piping become more complicated, and the work space inside the overflowing shield machine is further narrowed, resulting in reduced workability. There is.

In view of the above-mentioned problems, an object of the present invention is to provide a gable frame pressurizing device that uses a telescopic jack for propulsion equipped in a shield machine to combine shield propulsion force and concrete gable pressurization. .

[Means for solving the problem]

In order to achieve the above-mentioned object, the gist of the present invention is to provide a gable frame pressure plate to the gable frame in a shield machine with a cast-in-place lining method in which a synthetic shaft formed in a sheath tube is propelled by a reaction force. A tubular push fitting slidably penetrating the gable frame is provided, the push fitting is connected to the grate frame pressure plate at a position communicating with the sheath pipe, and the push fitting is pressed by a telescopic jack for shield propulsion. A gable frame pressing device for a shield machine, characterized in that the gable frame pressing device is configured to be capable of performing the gland frame pressing by the propelling telescopic jack.

[Action]

In the cast-in-place lining method with the above configuration, after the shield machine completes the excavation, extend the telescopic jack,
By touching the end surface of the rod with the metal fitting and pressing it,
The gable frame pressure plate is pressed through the pushing metal fittings, and the secondary pressurization of the existing cast concrete that has not yet solidified is performed. Promote expression.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an enlarged vertical sectional view of a wife frame portion, FIG. 2 is a schematic vertical sectional view of an embodiment of a shield machine according to a cast-in-place lining method, and FIG. The right half is second
In the figure, a cross-sectional view taken along the line AA, and a left half view shows a cross-sectional view taken along the line BB.

As shown in FIG. 2, the shield machine has a skin plate (outer shell) 1 formed in a cylindrical shape.
A cutter head 2 is rotatably provided on the front surface of the device. Note that a shield machine having no cutter head may be used. An auxiliary tail 4 is concentrically provided inside the shield tail 3 at the rear portion of the skin plate 1, and an airbag 5 is interposed between the shield tail 3 and the auxiliary tail 4. The airbag 5 is divided into an appropriate number in the circumferential direction (FIG. 3). Although not shown, the auxiliary tail 4 is connected to the shield machine side via a sliding jack and is configured to move as the shield machine is propelled.

An inner formwork 6 is installed on the inner surface of the concrete cast by the cast-in-place lining method, and the ring-shaped gable frame device 7 is provided so as to abut on the end face 6a on the face side of the inner formwork 6. There is. That is, the rod side of the gable frame jack 8 pivotally attached to the shield machine side is hinge-connected to the gable frame device 7, and when the gable frame device 7 moves in the propulsion direction of the shield machine and is removed from the gable frame. Except for the gable frame device 7,
It is pressed and fixed to the side surface.

As shown in FIG. 3, a plurality of propulsion jacks 9 are arranged in an annular shape inside the shield machine so as to evenly satisfy the required propulsion force. This propulsion jack 9 is a two-stage telescopic type jack, and as shown in FIG. 2, the second stage rod 9B of the propulsion jack is inserted into the sheath tube 10 through the end frame device 7 to form the sheath. A shield shaft is dug by applying a reaction force to a synthetic shaft (solidified super-hard mortar) 11 formed in a pipe 10. Also, the above-mentioned gable frame jack 8 dedicated to the gable frame movement
Similarly, a required number of circular rings are provided inside the shield machine (Fig. 3). Since the gable frame jack 8 does not pressurize concrete, the number of the arrangements may be small. In addition, 12 is a concrete casting pipe, 13 is a reinforcing member (rebar cage)
Is.

As shown in the enlarged cross-sectional view of FIG. 1, the gable frame device 7 includes a gable frame holding ring (also simply referred to as “gable frame”) 7A, a gable frame pressure plate 7B housed therein, and this gable frame pressure plate 7B. It is composed of a push metal fitting 7C which is connected and slidably penetrates the end frame holding ring 7A. That is, the end frame holding ring 7A is formed in a step shape, and a ring-shaped end frame pressing plate 7B is housed in the step portion 7a with a movable space (that is, a pressurizing allowance 1 described later). . A gable frame seal 14 is attached to the outer peripheral surface of the gable frame pressure plate 7B.
Is provided and slidably contacts the inner surface of the auxiliary tail 4 to seal the currently placed concrete 15.

On the other hand, the pressing metal fitting 7C is formed in a tubular shape, and is projected from the end frame pressing plate 7B at a position communicating with the sheath tube 10. Therefore, the second stage rod 9B of the telescopic jack 9 which is a propulsion jack can be inserted into the sheath tube 10 by inserting the pushing metal fitting 7C, and the end face of the first stage rod 9A is the brim-shaped end face 7b of the pushing metal fixture 7C. It is constructed so that it can abut and press it. l shows the amount of pushing (pressurization margin). By making the end surface 7b of the pressing metal fitting 7C into a brim shape, a pressing surface is formed and at the same time, when it is pushed in, it hits the endless frame holding ring 7A and acts to regulate the pushing amount. Thus, by extending the first stage rod 9A of the telescopic jack 9, it is possible to press the end frame pressing plate 7B via the pressing fitting 7C. Although not shown, dehydration at the time of pressurization is appropriately performed through a drain hole provided in the end frame press plate 7B or the inner mold 6, or the like. Further, as the above telescopic jack, for example, as described in Japanese Patent Application No. 1-65735, one capable of advancing and retracting both the first stage rod and the second stage rod in any order and obtaining a large pressing force is preferable. However, the present invention is not limited to the two-stage type and may be a three-stage type or the like.

4 (a) to 4 (f) are views showing the operation of the tail portion of the shield machine of the cast-in-place lining method according to the present invention with time. That is, FIG. 4 (a) shows that after the curing of the lining concrete constructed last time, the gable frame jack 8 is used to make the gable frame 7
6 shows a situation in which the end frame 7 is removed by sliding in the propelling direction.

FIG. 4 (b) is a diagram showing a preparatory work for placing lining concrete. After removing the end frame 7, the rebar cage 13 with a sheath pipe is held by the second stage rod 9B of the telescopic jack 9, It is connected to the synthetic shaft 11 constructed last time, and the plurality of divided reinforced steel cages 13 with a sheath pipe are assembled by a binding wire or the like. Further, the inner formwork 6 divided into a plurality of pieces is assembled by an inner formwork erector not shown in the same manner as the rebar cage 13 with the sheath pipe.

FIG. 4 (c) is a view showing the tail frame space 15 '(FIG. 2 (b)) surrounded by the lining concrete 16, the inner formwork 6 and the gable frame 7 constructed last time, and the gable frame 7 is penetrated. The situation where fresh concrete is filled from a plurality of placed concrete casting pipes 12 is shown.

FIG. 4 (d) shows the synthetic shaft 11 (FIG. 4 (c)) formed in the lining concrete 16 constructed last time as a reaction force to extend the first stage rod 9A of the telescopic jack 9, and accordingly A situation is shown in which the shield void is advanced while the tail void 17 generated is being filled with the fresh concrete fed by the concrete placing pipe 12 in synchronization with the amount of excavation (primary pressure of approximately 0.5 to ² kg / cm ² ).

FIG. 4 (e) is a diagram showing the state of secondary pressurization of the lining concrete (currently placed concrete) 15 constructed this time after the completion of the excavation. Pressing the end face of the fitting 7C pressing in the first stage rod 9A of the telescopic jack 9, the pressure wife frame pressing plate 7B via the press fitting 7C (secondary pressure of about 5 to 10 kg / cm ²⁾
(Fig. 1). As a result, the lining concrete 15 of this construction, which is not yet solidified, is further pressurized and dehydrated to achieve early strength development, thereby improving the self-supporting property and water stopping property of the concrete in the gable portion.

Fig. 4 (f) shows the situation in which a synthetic shaft that is the propulsive reaction force of the shield machine is formed within the time for curing the lining concrete 15 constructed this time. Inside the sheath tube 10 fixed to 13, an ultra-rapid hardening mortar is injected by a mortar pump (not shown).
It is filled via 18, and the synthetic shaft 11 constructed last time is made continuous.

[Effect of device]

As described above, according to the present invention, the following effects can be obtained. That is, (1) it is not necessary to install a jack frame exclusive jack and the like. Further, the number of hydraulic pipes, hydraulic hoses, etc. from the rear carriage is reduced, and the hydraulic jacks and hydraulic hoses installed on the gable frame itself are eliminated. Further, the number of complicated hydraulic circuits is reduced, and the narrow space inside the shield machine can be effectively used, and the tunnel work space is increased to improve the workability, and the shield excavator equipment cost is reduced.

(2) The gable concrete, which is the splice surface, can be self-supporting and the strength can be increased at an early stage, and the gable frame, which is the most important for preventing the intrusion of groundwater, can be effectively dehydrated.

(3) Since the telescopic jacks, which are propulsion jacks evenly arranged on the circumference, can uniformly pressurize,
Difference (variation) in the amount of dehydration on the circumference such as the upper and lower parts of the tunnel
Becomes smaller, concrete is dehydrated uniformly, and variations in strength are reduced.

(4) Since the pressurizing ability can be freely adjusted up to the thrust of the propulsion jack, it is possible to adjust the pressurizing force according to changes in the ground condition and the like.

(5) Since the propulsion jacks that can be operated independently are used, the required pressure can be applied to each part without being affected by the difference in the concrete reaction force generated at the top and bottom of the tunnel. . Therefore, gable frame (gable frame pressure plate)
There is no difference in the amount of dehydration due to tilting. Further, the end face is formed at a right angle to the inner mold, and a good jointing surface is formed.

(6) Since the gable frame jack is not used for pressurization but only for the purpose of moving the gable frame, the number of jacks and the capacity can be minimized, and the machine equipment cost can be reduced.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of a gable frame portion of a shield machine, FIG.
The figure is a schematic vertical cross-sectional view of a cast-in-place shield excavator, FIG. 3 is a main part view of the end frame of the shield excavator, and the right half is a cross-sectional view taken along the line AA in FIG. The left half view is a sectional view taken along the line BB in the same figure, and FIGS. 4A to 4F are views showing the operation of the tail portion of the shield machine over time. 3 ... Shield tail, 4 ... Auxiliary tail, 5 ... Airbag, 6 ... Inner mold, 7 ... Wife frame (device), 7A ... Wife frame holding ring, 7B ... Wife frame pressure plate, 7C ... Push metal fitting, 8 ... Wife frame jack, 9 ... Propulsion jack (telescopic jack), 9A
… First stage rod, 9B… Second stage rod, 10… Sheath tube, 11… Synthetic shaft, 13… Reinforcing member (rebar cage).

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Toshitsugu Horizaki, 2nd Sanbancho, Chiyoda-ku, Tokyo, Tobishima Construction Co., Ltd. (72) Yoshikazu Inada 2nd Sanbancho, Chiyoda-ku, Tokyo, Tobishima Construction Co., Ltd. ( 72) Inventor Hidetaka Omori 8-21-1, Ginza, Chuo-ku, Tokyo Takenaka Civil Engineering Co., Ltd. (72) Inventor Hiroshi Sakurai 8-21-1, Ginza, Chuo-ku, Tokyo Incorporated Takenaka Civil Engineering (72) Rev. Kiyohide 3-1, 1-1 Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Inside Kawasaki Heavy Industries Ltd. (72) Inventor Yoshimi Ishikawa 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Kawasaki Heavy Industries, Ltd. Inside the Kobe factory

Claims (1)

(57) [Scope of utility model registration request] 1. In a shield machine with a cast-in-place lining method in which a reaction force is applied to a synthetic shaft formed in a sheath pipe to propel it, a gable frame pressure plate is attached to the gable frame so that the gable frame can slide. A penetrating tubular push fitting is provided, the push fitting is connected to the gable frame pressure plate at a position communicating with the sheath tube, and the push fitting can be pushed by a telescopic jack for shield propelling. A gable frame pressurizing device for a shield machine, characterized in that a gable frame pressure is applied by a telescopic jack.