JP2891889B2 - Underwater tunnel penetration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for penetrating underwater tunnels, and more particularly to a method for penetrating underwater tunnels for constructing a tunnel through which water passes, such as an underground waterway or a reservoir.

[0002]

2. Description of the Related Art Generally, when a tunnel for passing water, such as an underground waterway or a reservoir, is made to reach underwater such as the sea or a river,
By using double sheet pile type closing method, caisson type closing method, embankment type closing method, etc., the reaching shaft is installed in the water at the reaching position.

[0003] In the double sheet pile type closing method, sheet piles are driven in parallel in two rows, and the inside is filled with earth and sand to form a wall.
The arrival shaft is constructed by this wall.

[0004] In the caisson type closing method, a caisson skeleton is sunk at the excavation reaching position to construct a reaching shaft.

[0005] In the embankment type closing method, a dam is constructed with earth and sand or the like, and the dam is excavated to construct a reaching shaft.

[0006] As described above, the reaching shaft is installed in the underwater such as the sea or river, which is the excavation reaching position, the inside of the reaching shaft is made dry, and the shield machine reaches the inside of the dry reaching shaft. Then, the shield machine is dismantled and removed in the arrival shaft.

[0007]

As described above, a double sheet pile type cut-off method, a caisson type cut-off method, an embankment type cut-off method, etc. are used to reach the underwater in the sea or river where the shield machine is reached. In the case of installing a shaft and letting the shield machine reach this reaching shaft, there is a problem that it takes days to construct the reaching shaft, the construction period is lengthened, and the construction cost is increased. .

In particular, when the number of days available for construction from the water is short due to waves, tides, weather, etc., there has been a problem that it is difficult to install a reaching shaft which requires days for construction.

In the case of constructing a reaching shaft underwater, various organisms inhabit the coastal area near the land, especially in the sea. If the reaching shaft is constructed in this habitat, a large-scale habitat is provided in the habitat. Pile driving and excavation are performed, and there is a possibility that the ecosystem of living organisms living there may be changed, and there is a problem that it is not preferable in terms of environmental protection.

Further, when trying to excavate underwater by the shield method, there is a problem that it is difficult to completely stop the water simply by stopping the water by the shield packing of the shield machine.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to ensure that water can be reliably stopped when a tunnel is penetrated into water, and that construction can be performed safely and in a short time. It is an object of the present invention to provide a method of penetrating underwater tunnels that is possible, has low construction costs, and is suitable for protecting the natural environment.

[0012]

Means for Solving the Problems To achieve the above object, a first invention comprises a step of constructing a starting shaft at a shield starting position and a step of assembling a shield from the starting shaft to a position near a shoreline while assembling segments. And connecting the propulsion pipe to the tail part of the shield machine in the segment near the shoreline while propelling the propulsion pipe by the propulsion jack arranged in the segment to reach the shield machine underwater; and Attaching a sealing lid to the propulsion pipe at the position to stop water, separating the propulsion pipe from the water after separating the shield machine from the propulsion pipe after sealing the propulsion pipe with the hermetic lid, Removing the sealing lid of the tube.

According to a second aspect of the present invention, in addition to the first aspect, a connecting member for waterproofly connecting the propulsion pipe to the propulsion pipe is attached to the tail portion of the shield machine in the segment, and the propulsion pipe is connected to the connection material. It is characterized by:

According to a third aspect of the present invention, in addition to the first aspect, a water stop seal for stopping water between the segment and the propulsion pipe is attached near the tip of the segment, and a position closer to the propulsion jack than the water stop seal is provided. It is characterized by having an emergency water stop device.

According to a fourth aspect of the present invention, in addition to the first aspect, after the shield machine is separated, water is injected into a tunnel pit, and then the sealing lid is removed.

[0016]

According to the first aspect of the present invention, after digging from the starting shaft to a position near the shoreline by the shield method,
In the segment, the propulsion pipe is propelled by the propulsion method with the propulsion jack while connecting the propulsion pipe to the tail part of the shield machine, and the shield machine reaches underwater, so that the water is reliably stopped from near the shoreline to reach the water. Can be propelled in a state where the propulsion pipe and the tail portion of the shield machine are securely connected, and a reliable water stop state can be obtained.

[0017] Further, after the water is stopped by attaching a sealing lid to the propulsion pipe at the underwater reaching position, the shield machine is taken out of the water, and then the sealing lid is removed from the water, so that the inside of the tunnel pit is reliably stopped by the sealing lid. The shield machine can be taken out in the state, and the shield machine can be taken out safely and in a short time without using a reaching shaft. Furthermore, since a reaching shaft is not required, the construction cost is low, and there is little influence on living organisms living in water, which is favorable for environmental protection.

According to the second aspect of the present invention, the tail portion of the shield machine is provided with a connecting member for watertight connection with the propulsion pipe, and the propulsion pipe is connected to the connecting member, so that the tail portion and the propulsion pipe are connected to each other. The water stoppage during the period can be further ensured.

According to the third aspect of the present invention, a water stop seal is attached near the tip of the segment and an emergency water stop device is provided at a position on the side of the propulsion jack, thereby stopping the water between the propulsion pipe and the segment. Water can be ensured and work safety can be increased.

According to the fourth aspect of the present invention, a safe tunnel penetrating operation can be performed without being affected by water pressure by removing the sealing lid after pouring water into the tunnel pit.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 11 show a method of penetrating a tunnel into water according to an embodiment of the present invention.

In this embodiment, a tunnel penetration method into water is used under construction conditions as shown in FIG.

That is, in FIG. 11, the estuary of the river 14 faces from the land 10 to the sea 12, and the tide A flows in the sea 12 across the estuary of the river 14. Therefore, the tide A is likely to cause the sandbar 16 to block the estuary in front of the estuary, so that sediment 48 is formed between the sandbar 16 and the estuary, and the river 14 is likely to increase in water level.

Therefore, a waterway tunnel 18 is constructed from the middle of the river 14 toward the sea, and the water of the river 14 is caused to flow directly to the sea 12 through the waterway tunnel 18 so that the water 14
To prevent the water from rising.

When constructing the waterway tunnel 18,
First, as shown in FIG. 1, a starting shaft 20 is constructed at a shield starting position in the middle of the river. This shaft 2
In the case of 0, sufficient water stoppage is performed so that water in the river 14 does not enter.

Next, as shown in FIG.
From the shoreline T to the vicinity of the shoreline T, while assembling the segment 26 with the shield machine 24,
To build.

Next, as shown in FIGS. 3 and 4, in a segment 26 near the shoreline T, a connecting member 32 for waterproofly connecting the propulsion pipe 30 to the tail portion 28 of the shield machine 24.
Is attached by welding or the like, and while the propulsion pipe 30 is connected to the connecting member 32, the propulsion pipe 30 is propelled by the propulsion jack 34 disposed in the segment 26, and the shield machine 24 reaches the seabed slope 36 by the propulsion method. Let it.

In this case, the tail portion 28 of the shield machine 24
Even when the shield machine 24 reaches the seabed slope 36 and is exposed to the water, the water is reliably stopped and the safe propulsion is performed because the water and the propulsion pipe 30 are connected by the connecting member 32. Can be performed.

In the vicinity of the distal end in the segment 26, a water stop seal 22 for stopping water between the propulsion pipe 30 and the water stop seal 22 is provided.
Is mounted, and an emergency water stop device 40 is provided at a position closer to the propulsion jack 34 than the water stop seal 22. By stopping water between the propulsion pipe 30 and the segment 26, the waterway tunnel is The water stop in the water channel 18 is ensured, so that the safety of work in the waterway tunnel 18 can be ensured.

Further, at the time of propulsion of the propulsion tube 30, a lubricating material 54 is injected around the propulsion tube 30 to facilitate the propulsion. In this case, since the propulsion pipe 30 is propelled from the inside of the segment 26, the outer diameter of the propulsion pipe 30 is smaller than the excavation diameter of the shield machine 24, and the lubricating material 54 is filled more by that amount to eliminate the gap. I have.

Next, the segment 26 assembled by the shield method and the propulsion pipe 3 propelled by the propulsion method
After constructing a continuous waterway tunnel 18 by connecting 0 and 0 in the segment 26, as shown in FIG. 5, a sealing lid 42 is attached to the propulsion pipe 30 immediately before the underwater arrival position to stop water in the waterway tunnel 18. Do. This sealing lid 42 is adapted to be attached between the connecting member 32 and the first propulsion pipe 30 from the top, and between the connecting member 32 and the first propulsion pipe 30 as shown in FIGS. As shown in FIG. 5, a reinforcing ring 46 having substantially the same diameter as the propulsion pipe 30 having the sealing lid mounting ring 44 mounted on the distal end side is mounted, and the sealing lid 42 is mounted on the sealing lid mounting ring 44 from the distal end side. .

On the rear surface of the sealing lid 42, four sealing lid reinforcing steel members 52 supported by a reinforcing ring 46 via a bracket 50 are disposed.
, The sealing lid 42 is reinforced. Therefore, even when a water pressure is applied to the sealing lid 42, it is in a state where it can sufficiently cope with the water pressure.

Next, after sealing the propulsion pipe 30 with the sealing lid 42 and stopping the water, as shown in FIG. 6, the shield machine 24 is separated from the propulsion pipe 30 by diving, and the shield machine 24 is taken out from the water. .

Next, after taking out the shield machine 24 shown in FIG.
After injecting water into the pit of the waterway tunnel 18 and filling the pit with water, diving from the sea to the tip position of the waterway tunnel 18, as shown in FIG. 7, the hermetic lid 42 attached to the propulsion pipe 30 is closed. By removing the underwater from the water, the waterway tunnel 18 and the sea 12 communicate with each other, and the waterway tunnel 18 can be completed safely and in a short period of time without destroying the environment near the coast.

Therefore, the water in the river 14 is bypassed into the sea by the water channel tunnel 18 to flow out, so that the sand bar 16 formed at the estuary forms sediment 4 near the estuary.
Even when 8 occurs, it is possible to suppress an increase in the river 14.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the description has been given of the case of the construction of the waterway tunnel. However, the present invention is not limited to this example. In addition, it is possible to have a water storage function. In the above embodiment,
Although the case where the waterway tunnel is constructed from the river to the sea has been described, it is needless to say that the present invention is not limited to this example and can be applied to, for example, a waterway tunnel connecting a river to a river, a lake or a reservoir or a river.

When the shield machine is taken out of the water, the shield machine may be directly lifted, or a housing for accommodating the shield machine may be prepared and the shield machine may be hung in the housing.

[0040]

As described above, according to the first aspect of the present invention, after excavating from the starting shaft to a position near the shoreline by the shield method, the propulsion is performed while connecting the propulsion pipe to the tail portion of the shield machine in the segment. The propulsion pipe is propelled by the jack by the propulsion method and the shield machine reaches the water, so that the distance from the vicinity of the shoreline that requires reliable water stop until reaching the water is adjusted between the propulsion pipe and the tail part of the shield machine. Propulsion can be performed in a reliably connected state, and there is an effect that a reliable water stop state can be obtained.

Further, after a sealed lid was attached to the propulsion pipe at the underwater reaching position to stop the water, the shield machine was taken out of the water, and then the sealed lid was removed from the water, so that the inside of the tunnel pit was reliably stopped by the sealed lid. The shield machine can be taken out in the state, and there is an effect that the shield machine can be taken out safely and in a short time without using a reaching shaft.

Further, since no reaching shaft is required, the construction cost is low, and there is little effect on living organisms living in water, which is advantageous in environmental protection.

According to the second aspect of the present invention, a connecting member for waterproofly connecting the propulsion pipe to the tail section of the shield machine is provided, and the propulsion pipe is connected to the connecting member, whereby the tail section and the propulsion pipe are connected. There is an effect that the water stoppage between them can be further ensured.

According to the third aspect of the present invention, the water stop seal is provided near the distal end of the segment, and the emergency water stop device is provided at a position on the propulsion jack side, so that the water stop between the propulsion pipe and the segment is provided. Therefore, there is an effect that work safety can be improved.

According to the fourth aspect of the present invention, after the water is injected into the tunnel pit, by removing the sealing lid, there is an effect that the tunnel can be safely penetrated without being affected by the water pressure.

[0046]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a starting shaft construction process in a submerged tunnel penetration method according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a step of excavating from a starting shaft to near a shoreline by a shield method in the state of FIG. 1;

FIG. 3 is a cross-sectional view showing a state in which propulsion by the propulsion method is performed from the state of FIG. 2 to an underwater reaching position in a segment near the shoreline.

FIG. 4 is a partially enlarged cross-sectional view showing a state of reaching underwater by propulsion of a propulsion pipe in FIG. 3;

FIG. 5 is an enlarged cross-sectional view showing a state where the water is stopped by attaching a sealing lid to the propulsion pipe at the position reached in water from the state of FIG. 4;

FIG. 6 is an enlarged sectional view showing a step of separating and taking out the shield machine from the propulsion pipe from the state of FIG. 5;

FIG. 7 is an enlarged sectional view showing a process of injecting water into the tunnel pit from the state of FIG. 6 and removing the sealing lid.

FIG. 8 is a partially enlarged cross-sectional view of a sealing lid.

FIG. 9 is a front view from the direction of the arrow IX in FIG. 8;

FIG. 10 is a front view of the sealing lid mounting ring of FIGS. 8 and 9;

FIG. 11 is a plan view showing construction conditions in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Land 12 Sea 14 River 16 Sandbar 18 Waterway tunnel 20 Starting shaft 22 Waterproof seal 24 Shield machine 26 Segment 28 Tail part 30 Propulsion pipe 32 Connection material 34 Propulsion jack 36 Seabed slope 40 Waterstop device 42 Sealing lid 44 Sealing lid attachment ring 46 Reinforcement ring 48 Sediment T Shoreline

────────────────────────────────────────────────── ─── Continuing on the front page (72) Koji Tada, Inventor 1-7-1, Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd. (72) Hideo Yoshikawa 3-2-25, Kugayama, Suginami-ku, Tokyo (58 ) Surveyed field (Int.Cl. ⁶ , DB name) E21D 9/06 301

Claims (4)

(57) [Claims] 1. A step of constructing a start shaft at a shield start position, a step of assembling a shield while assembling a segment from the start shaft to a position close to a shoreline, and propelling a tail end of a shield machine in a segment close to the shoreline. A step of propelling the propulsion pipe by a propulsion jack disposed in the segment while connecting the pipes, and causing the shield machine to reach underwater; and attaching a sealing lid to the propulsion pipe at the underwater reaching position to stop water, and After sealing the propulsion pipe with the sealing lid, separating the shield machine from the propulsion pipe and taking it out of the water; and removing the shield machine and removing the sealing lid of the propulsion pipe from the water after taking out the shielding machine. Tunnel penetration method. 2. The underwater of claim 1, wherein a connecting member for watertight connection with the propulsion pipe is attached to a tail portion of the shield machine in the segment, and the propulsion pipe is connected to the connecting material. Tunnel penetration method. 3. The watertight seal according to claim 1, wherein a waterstop seal for stopping water between the segment and the propulsion pipe is attached near the tip of the segment, and an emergency waterstop is provided at a position closer to the propulsion jack than the waterstop seal. Underwater tunnel penetration method characterized by the installation of equipment. 4. The method of penetrating underwater tunnel according to claim 1, wherein after separating the shield machine, water is poured into a tunnel pit, and then the sealing lid is removed.