JPS5916071B2 - Airlock device used for pneumatic shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an airlock device used in a pneumatic shield construction method using divided segments having a relatively large center angle, for example, three equally divided segments having a center angle of 120°.

Generally, in the pneumatic shield construction method using segments with relatively small central angles, an aerodynamic chamber is formed by airtightly partitioning at least 21 segment rings of a tunnel assembled under unpressurized air.

In particular, if the diameter of the tunnel to be constructed is sufficiently large, it is also possible to form an airlock chamber for transporting materials and an airlock chamber for workers separately within the same cross section of the tunnel.

This is because sufficient space required for material handling and for the entry and exit of workers can be easily secured not only in the tunnel but also in the aerodrome which is divided into two parts.

In this way, with the pneumatic shield construction method that uses segments with relatively small central angles, there is no need to be particularly creative in the arrangement of the aerodynamic chambers, and the aerodynamic chambers can be formed by appropriately partitioning the inside of the tunnel. Moreover, it is considered to be the most economical way to do so.

On the other hand, in the shield construction method, which uses segments with relatively large central angles, it is extremely difficult to transport materials through the aerodynamic chambers formed by partitioning the inside of the tunnel.

In particular, in the shield construction method that uses segments divided into three equal parts, the central angle of the segment is 120°, so the arc length is large, so the inner diameter of the tunnel is fully used to transport the segment within the tunnel. arise the need to do so.

On the other hand, due to its structure, the opening/closing door of the aerodynamic chamber cannot be arranged by making full use of the inner diameter of the tunnel.

Therefore, the shield tunnel method, which uses segments divided into three equal parts, cannot be used in combination with the pressure air method unless an aerodynamic device is used that has an inner diameter larger than the inner diameter of the shield tunnel and is equipped with an opening/closing door that allows the segments to pass through. It's impossible.

However, the special installation of such an aerodynamic device requires a very large amount of expense.

SUMMARY OF THE INVENTION An object of the present invention is to provide an aerodynamic device that can be installed more economically for use in shield construction methods that target segments with relatively large central angles.

In order to achieve this object, the aerodynamic device according to the invention is formed by partitioning at least two segment rings assembled under pressureless air, the partitioning comprising:
Consisting of a partition wall that is fixed to the inner periphery of a corresponding segment ring and forms an opening that allows the segments to pass through, and an opening/closing door that is attached to the partition wall and arranged to airtightly close the opening, Furthermore, a central portion is attached to the partition wall so that the opening/closing door can be rotated toward the face about a rotation axis extending horizontally within the plane of the partition wall, away from the center axis of the shield tunnel. and at least a pair of side parts arranged so as to be able to completely open the opening by displacing relative to the opening when the central part rotates.

Therefore, according to the invention, the aerodynamic device can be installed in a shield tunnel in a very economical way, since by completely opening the door, an opening is formed in the partition wall that allows the passage of the dividing segment. becomes possible.

In a preferred embodiment of the invention, the segments of the segment ring to be partitioned are formed by segments having approximately the same outer diameter as the segments of the other segment rings and a larger inner diameter, and the partition walls are formed by segments of said other segment ring.
It can be fixed to the inner circumference of the corresponding segment ring radially outward from the inner circumference of the IJ song.

In that case, the fixing structure of the partition wall does not protrude radially inward from the inner periphery of the other segment rings, so at least the opening portions corresponding to both ends of the segment are similar to those in the other segment. can be secured.

Moreover, the area of the peripheral edge of the opening that overlaps with the opening/closing door can be increased due to the difference in the inner diameter of the segment rings, so that airtightness during closing can be better ensured.

In another embodiment of the invention, the central part of the door is attached to the partition wall at its lower end, while the side parts of the door are rotatably attached to the central part and when the door is opened. It can be arranged so that it can overlap with the central part.

In that case, the opening/closing door is rotated integrally toward the face with the side portion overlapped with the center portion, and is left stationary in a nearly horizontal position, making it easier to work inside the aerotsuk device when opening. Sexuality is not hindered by doors that open and close.

In the above configuration, the side portions of the opening/closing door are further arranged so as to overlap with the side surfaces of the central portion facing downward when the door is opened, and at the same time, the side portions of the central portion facing upward are provided within the shield tunnel. A rail can be provided to be connected to the rail being laid.

In that case, when the opening/closing door is opened, the rails provided on the sides of the central part are automatically connected to the rails in the shield tunnel, so the free opening and closing of the opening/closing door is not obstructed by the rails as in conventional aerotic devices. It also eliminates the need to remove the rail that interferes with the opening/closing door every time you open or close it.

Embodiments of the present invention shown in the drawings will be specifically described below.

Figure 1 shows a cross section of the pneumatic shield work.

The shield machine 12 launched from the shaft 10 initially excavates under unpressurized air, and inside the shield machine 12 divides into three equal segments 14 and 16.
, 18 are assembled into an annular shape to sequentially form the segment ring 20.

For this reason, the ground adjacent to the shaft 10 is improved in advance by, for example, injecting a chemical solution, if necessary.

In the present invention, two segment rings 22, 24
An airlock device 26 is formed by airtightly partitioning.

This partition is a segment ring 22, as described below.
, 24, and the segments 14, 16, 18
partition wall 32 forming openings 28, 30 allowing passage of
34 and opening/closing doors 36.3 attached to these partition walls 32.34 and airtightly closing the opening 28.30.
8.

A rail 40 is laid in the shield tunnel consisting of the assembled segment rings 20, 22, 24, and a trolley 42 that can run on the rail 40 is used to transport the segment) 1.
4, 16, 18, etc. into the inside of the shield machine 12 and excavated earth and sand can be carried out.

In addition, an air compressor 44 is arranged on the ground, and this compressor 4
4 causes pressure to act within the shield tunnel between the face and the aerodynamic device 26.

The segment rings 22, 24 to be partitioned are formed by segments having approximately the same outer diameter as the segments 14, 16.18 of the other segment rings 20 and a larger inner diameter.

For this purpose, thinner steel segments are used as the segments of these segment rings 22, 24, and the segments 14° 1 of the other segment rings 20 are
For 6.18, thicker concrete segments are used.

The reason for this will be explained later.

FIG. 2 is a sectional view of the partition wall 34 and the opening/closing door 38 shown in FIG. 1, viewed from the face side.

The partition wall 32 and the opening/closing door 36 can have the same configuration as the partition wall 34 and the opening/closing door 38, so a description thereof will be omitted.

The opening/closing door 38 is constituted by a central portion 46 formed into a substantially square shape and a pair of side portions 48° and 50.

The central portion 46 is hinged 52.54 at its lower edge.
It is attached to the partition wall 34 and arranged so as to be able to rotate toward the face.

A link mechanism 56 of an appropriate structure for opening and closing the opening/closing door 38 is attached to the central portion 46 on the side surface facing downward when rotating.
Similarly, the above-mentioned rail 40 is provided on the side surface facing upward during rotation.
A rail 58 is provided which is connected to.

The central portion 46 is further provided with a window 60 made of pressure-resistant glass or the like so that the working conditions within the shield tunnel or airlock device 26 can be observed through the opening/closing door 38.

On the other hand, the side portions 48,50 have one side formed in an arc shape approximately corresponding to the inner periphery of the segment ring 24, and are connected to the sides of the central portion 46 by hinges 62, 64, 66°68 on sides opposite to the above-mentioned side. It is attached to the edge and arranged so that it can be rotated towards the face and overlapped with the central part 46 in the same manner as the central part 46.

In order to fix the side portions 48 and 50 to the inner periphery of the segment ring 24 in the closed position of the opening/closing door 38, the side portions 48 and 50 are
8 and 50 are provided with locking mechanisms 70 and 72 of suitable construction.

It goes without saying that the opening/closing door 38 consisting of the central portion 46 and the side portions 48.degree.

As a segment of the segment ring 24 to be partitioned,
As shown in FIG. 3, reinforcing ribs 74 are arranged on the inner periphery,
These ribs form the inner circumference 20' of the other segment ring 20.
If more outwardly located steel segments are used, the partition wall 34 is secured to the rib 74 via the seal member 76 with bolts 778 (see FIG. 4).

Then, the peripheral edge of the partition wall 34 on the opening 30 side should not protrude inward in the radial direction from the inner periphery of the other concrete segment (IJ song 0).

It is preferable to insert an elastic sealing member 80 into each peripheral edge of the partition wall 34 and the central portion 46 and side portions 48.degree. 50 which overlap the partition wall 34.

A link mechanism 5 for opening and closing the opening/closing door 38 as described above.
6 comprises in the illustrated embodiment a first link 84 attached to central portion 46 by a pin 82 .

A pair of left and right second links 88.90 are attached to the ends of this link 84 by pins 86.

The ends of the second links 88,90 are each attached to the lower part of the partition wall 34 by a common shaft 92.

The intermediate portions of each of the second links 88, 90 are connected by a connecting member 94.

The connecting member 94 rotatably connects the hydraulic cylinder 96 to the second links 88 and 90.

One end of the fluid pressure cylinder 96 is connected to the common shaft 92, and the other end is supported by a support member 98 extending substantially horizontally toward the face.

Alternatively, the end of the hydraulic cylinder 96 may be directly connected to the inner periphery of the segment ring.

The airlock device 26 having the above-described structure has an opening/closing door 38.
Allow material to pass through by opening and closing as follows.

In the closed position of the opening/closing door 38 shown in FIG. 2, the locking mechanisms 70, 72 of the side portions 4B, 50 are operated to release the side portions 48 and 50 from the inner periphery of the segment ring 24, and the respective hinges 62° are released. 64 and 66.68 to fold back and overlap the central portion 46.

In this state, the central portion 46 and the side portions 4B, 50 are fixed by suitable means (not shown), such as a U-shaped fixing pin (see FIGS. 5 and 7).

As shown in FIG. 7, in this state the portions of the opening 30 corresponding to the side portions 48, 50 on both sides of the central portion 46 are open.

Next, by applying fluid pressure to the hydraulic cylinder 96 and compressing it, the second link 88°90 is moved to the common axis 92.
5 in the clockwise direction in FIG.

As a result, the central portion 46 rotates integrally with the side portions 48, 50 about the hinges 52, 54 in a similar clockwise direction in FIG.

This rotation is limited by the abutment of the central portion 46 against a stopper 100 provided on the inner periphery of the segment I-IJ song (see Figures 6 and 8).

As shown in FIG. 8, the opening 30 is completely opened in this state.

The width of this opening at its widest part is approximately equal to the inner diameter of the other segment ring 20, the inner circumference of which is indicated by 20'.

Therefore, the three equally divided segments can pass through the opening 30 without being interfered with by the partition wall 34, as shown by the imaginary lines.

As mentioned above, the partitioned segment ring 22.2
4 is made of steel segments, and all the other segment rings 20 are made of concrete segments, so in the end, only the inner peripheries of the segment rings 22 and 24 made of these steel segments need to be lined with concrete. .

Therefore, the construction of the shield tunnel can be carried out extremely simply and therefore economically compared to the case where the entire shield tunnel is composed only of steel segments.

As described in detail above, according to the present invention, it is possible to extremely economically install an aerodynamic device in a shield tunnel that allows passage of a segment having a relatively large central angle.

Note that the present invention is not limited to the above-described embodiments.

For example, the hinge 52 of the central portion 46 of the opening/closing doors 36, 38
．． 54 may be located at the upper edge of the central portion 46 rather than at the lower edge.

Also, the pair of side portions 48, 550 of the opening/closing doors 36, 38 are connected to the partition wall 34 instead of being hinged to the central portion 46.
They may also be hinged to or slidably disposed relative to the central portion 46 so as to overlap one another.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the pneumatic shield work using the airlock device according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ of Fig. 1 showing the opening/closing door in the closed position, and Fig. 3 is Fig. 2 ■−
■A cross-sectional view along the line, Figure 4 is a detailed enlarged view of a part of Figure 3, Figure 5 is a longitudinal cross-sectional view of the opening/closing door with the side part open, and Figure 6 is a complete view of the opening/closing door. 7 and 8, which are longitudinal sectional views of the door in the open state, correspond to FIGS. 5 and 6, respectively, and are similar to FIG. 2. 12... Shield machine, 14, 16, 18...
... Segment, 20 ... Segment ring, 22° 24 ... Partitioned segment ring, 26 ... Aerodynamic device, 28, 30 ...
...Opening, 32°34...Partition wall, 36,3
B...Opening/closing door, 46...Central part, 4
B, 50...lateral part.

Claims (1)

[Scope of Claims] 1. An aerodynamic device used in a pneumatic shield construction method in which a shield tunnel is constructed by sequentially forming unit segment rings by assembling divided segments with relatively large central angles, the aerodynamic device comprising: , formed by partitioning segment rings assembled under no-pressure air, (BJ) The partition of the aerodynamic device is fixed to the inner periphery of the corresponding segment ring, and is a partition wall that forms an opening that allows the segment to pass through. , an opening/closing door attached to the partition wall and arranged to airtightly close the opening, and (C) the opening/closing door is spaced apart from the central axis of the shield tunnel and horizontal within the plane of the partition wall. a central portion attached to the partition wall so as to be able to rotate toward the face about a rotational axis extending in the center; 2. The airlock device according to claim 1, further comprising: The segment ring is formed by segments having an outer diameter approximately equal to that of the segments of the other segment ring and an inner diameter larger than the segment ring, and the partition wall is formed by a segment having a corresponding segment radially outward from the inner periphery of the other segment ring. An aerodynamic device that is fixed to the inner circumference of a ring. 3. The airlock device according to claim 1 or 2, wherein: a central portion of the opening/closing door is attached to the partition wall at its lower edge, and a side portion of the opening/closing door is attached to the central portion. 1. An airlock device, characterized in that the airlock device is rotatably attached to the opening/closing door and arranged so as to overlap with the center portion when the opening/closing door is opened.