JPH10292406A - Connecting method for underwater structure and shield tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting method of an underwater structure and a shield tunnel capable of reducing the cost of the underwater structure and reducing the construction period and construction cost. SOLUTION: The sediment on a shield tunnel 12 is removed, and a form 26 is installed at the prescribed position. A water immersion preventing means is applied to an underwater structure 14 to be connected to the tunnel 12, and the underwater structure 14 is fitted to the tunnel 12 in the form 26. Concrete having a water stopping property is placed in the form 28 to connect the tunnel 12 and underwater structure 14, and a through hole 38 is bored from the inside of the tunnel 12 to connect the underwater structure 14 and tunnel 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting an underwater structure and a shield tunnel suitable for application to, for example, an intake pump station or a drain pump station of a thermal power plant.

[0002]

2. Description of the Related Art For example, in a thermal power plant constructed along the coast, a shield tunnel for water flow is excavated from an intake pump or a drain pump toward the sea floor, and a filter facility is connected to a tip of the shield tunnel. It is common practice to prevent underwater debris from entering the pump.

Conventionally, when connecting a shield tunnel for water flow and a filter facility, the filter facility is first constructed at a predetermined position in the sea. Next, a shield tunnel is excavated from the intake pump or the drain pump until the filter facility is reached. Then, it is common to form a through hole in the outer wall from the inside of the filter facility and connect it to the shield tunnel.

[0004]

However, in the conventional connection method between a filter facility and a shield tunnel, the upper end of the filter facility is extended to the surface of the sea in order to drill holes in an outer wall inside the filter facility. Since seawater was prevented from entering the inside of the filter facility, an additional part extending to the sea surface was additionally provided on the part originally required for the filter facility, resulting in a problem of increased cost. there were.

In addition, when a through hole is formed in the outer wall from the inside of the filter facility, the ground around the filter facility is improved or prevented in order to prevent inundation or inflow of sediment from the joint between the filter facility and the shield tunnel. Auxiliary construction methods such as freezing were required, which also caused an increase in construction period and construction cost.

Further, since the construction of the filter facility is performed offshore, a deadline method, a caisson method using Tsukishima, an installation caisson method using a steel shell, and the like have been used. However, there is a problem that it is necessary and disadvantageous in terms of construction period and construction cost.

[0007] Such a problem occurs not only when the filter facility and the shield tunnel are connected but also when various underwater structures and the shield tunnel are connected. SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and to provide a method of connecting an underwater structure and a shield tunnel capable of reducing the cost of the underwater structure and reducing the construction period and cost. To provide.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for connecting an underwater structure and a shield tunnel, and is configured as follows to solve the above-mentioned technical problem. That is, the present invention removes earth and sand on a shield tunnel provided in the ground at the bottom of the water, installs a formwork at a predetermined position of the shield tunnel, and prevents inundation in an underwater structure to be connected to the shield tunnel. Applying means, attaching the underwater structure to the shield tunnel in the formwork, casting concrete having water stoppage in the formwork to join the shield tunnel and the underwater structure, The underwater structure and the shield tunnel are connected by forming a through hole in the partition wall between the underwater structure and the shield tunnel from inside the shield tunnel.

In the method for connecting an underwater structure and a shield tunnel according to the present invention, the underwater structure whose internal space is maintained and the shield tunnel are connected to each other by a waterproof concrete, and then the shield tunnel and the underwater structure are connected. Since a through hole is formed in the partition between the structure and the inside of the shield tunnel from inside the shield tunnel, it is possible to prevent flooding and inflow of earth and sand into the shield tunnel during drilling work.

The shield tunnel may be a shield tunnel for water passage connected to an intake pump or a drain pump of a thermal power plant, and the underwater structure may be a filter facility provided at a tip of the shield tunnel for water passage. it can.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a method for connecting an underwater structure and a shield tunnel according to the present invention will be described.
This will be described in detail with reference to the drawings.

FIG. 1 to FIG. 14 are diagrams for explaining a work procedure when the method of connecting an underwater structure and a shield tunnel according to the present invention is applied to, for example, an intake pump station of a thermal power plant along a coast. is there. In this connection method, first,
As shown in the figure, a shield tunnel 12 for flowing water extending from an intake pump (not shown) of a thermal power plant underground on the seabed 11.
To form

Next, a predetermined range of earth and sand 13 on the shield tunnel 12, that is, an appropriate range W including a place where a filter facility 14 (FIG. 10) to be described later is to be installed is put into, for example, a grab dredger. Remove by dredging using 15 or the like.

Next, as shown in FIG. 2, after the segment surface of the shield tunnel 12 is finished and smoothed, a bracket 17 for attaching the filter facility 14 to a predetermined position of the shield tunnel 12 is fixed. Next, the pedestal 1 is made of concrete on the ground surface on both sides of the shield tunnel 12.
8 is installed. In addition, the code | symbol 19 in a figure is a concrete mixer ship, 20 is a diver's ship.

Next, as shown in FIG. 3, the lower pipe 21 of the filter facility 14 and the fixture 22 provided on the side of the lower pipe 21 are placed on the shield tunnel 12 and the bracket 17 respectively. At this time, the lower pipe 21 has a lower end face opened and an upper end face sealed with the bulkhead 23. In addition, 24 in FIG. 3 is a hanging tool, 25 is a hoist ship. As shown in FIG. 4, a packing 2 is provided between the lower pipe 21 and the segment 12a of the shield tunnel 12.
1a is arranged. This can prevent the inside of the lower pipe 21 from being flooded.

Next, as shown in FIG. 5, the air in the lower pipe 21 is evacuated using the vacuum generating means (not shown) of the diver's ship 20, and the pressure is reduced. Then, seawater pressure is applied to the outer surface of the lower pipe 21, and this water pressure causes the lower pipe 21.
Is pressed against and adhered to the shield tunnel 12.
In this state, the fixture 22 is fixed to the bracket 17 with bolts. Subsequently, pressurized air is sent into the lower pipe 21 to perform a test for confirming the water stopping performance of the contact portion between the lower pipe 21 and the shield tunnel 12.

Subsequently, as shown in FIG. 6, a formwork, in this embodiment, an RC formwork 26, is placed and fixed on the pedestal 18. In the RC frame 26, an inner cylinder and an outer cylinder having a height lower than the inner cylinder are concentrically arranged, and the inner pipe surrounds the lower pipe 21. Since the RC form 26 is disposed above the pedestal 18, there is a gap on the side of the pedestal 18. Reference numeral 27 in the figure is a hanging tool.

Next, as shown in FIG. 7, the upper pipe 28 of the filter facility 14 is arranged on the lower pipe 21 in the RC form 26. The upper end surface of the upper pipe 28 is closed with a lid 29. In addition, the bulkhead 23 of the lower pipe 21 is removed. Reference numeral 30 in the figure denotes a barge that transports the upper pipe 28. Next, as shown in FIG.
A predetermined amount of underwater concrete is poured into the inside, and the underwater concrete is spread around the pedestal 18 to form a base 31 below the RC formwork 26.

After the base 31 has hardened, underwater concrete 32 is poured and filled inside the inner and outer cylinders of the RC formwork 26 as shown in FIG. The underwater concrete 32 has characteristics as a structural member and water-stopping property. Then, the shield tunnel 12, the lower pipe 21, and the upper pipe 28 are connected by the underwater concrete 32 cast in the inner cylinder of the RC formwork 26.

Next, as shown in FIG. 10, a plurality of side poles 33 having a predetermined height are erected on the underwater concrete 32 outside the RC formwork 26. Then, the filter section 34 of the filter facility 14 is mounted on the side pole 33 and connected to the upper pipe 28. At this time, the filter unit 3
The intake port (not shown) of No. 4 is closed by a bulkhead 35 which is a flood prevention means, and the lid 29 of the upper pipe 28 is removed. Reference numeral 36 in the figure is a hanging tool.

Next, as shown in FIG. 11, earth and sand 37 are buried back around the RC formwork 26. Thereby, most of the shield tunnel 12, the lower pipe 21, and the upper pipe 28 are buried in the earth and sand 37, and the filter section 34 is formed.
Project above the earth and sand 37. Thereby, the filter unit 3
4, it becomes possible to take in seawater. Reference numeral 38 in the figure denotes a sediment transport ship.

Subsequently, as shown in FIG. 12, a relatively short drain pipe 40 and air pipe 41 are inserted into the outer wall on the upper side of the shield tunnel 12 and penetrate into the lower pipe 21. Thus, the seawater stored in the lower pipe 21 and the upper pipe 28 flows out into the shield tunnel 12 through the drain pipe 40. Next, after the seawater flowing into the shield tunnel 12 is drained, pressurized air is supplied into the shield tunnel 12 to perform a water leakage test.

Next, as shown in FIG. 13, a partition wall between the shield tunnel 12 and the filter facility 14 from the inside of the shield tunnel 12, in this embodiment, above the outer wall of the shield tunnel 12, and inside the lower pipe 21. Then, a through hole 38 penetrating through is formed. Thereby, shield tunnel 1
2 and the filter facility 14 are connected.

Thereafter, by removing the bulkhead 35 of the filter facility 14 and opening the water intake of the filter part 34, it becomes possible to take in seawater through the filter part 34 with the water intake pump. The filter unit 34 can prevent dust and the like in seawater from being sucked into the water intake pump at the time of water intake. The removed bulkhead 3
5 is a lower pipe 21 of a shield tunnel 12 and a filter facility 14 for maintenance of an intake pump and the like.
And when the seawater in the upper pipe 28 is drained.

As described above, in this method of connecting the underwater structure and the shield tunnel, the filter facility 14 whose internal space is held by the bulkhead 35 and the shield tunnel 12 are connected with the underwater concrete 32 having water blocking properties. The shield tunnel 12 and the filter facility 14
When a through-hole 38 is made from the inside of the shield tunnel 12 to the partition wall between the shield tunnel 12 and the outer wall of the shield tunnel 12, water or earth and sand flows in from the joint between the shield tunnel 12 and the filter facility 14. Can be prevented.

Therefore, as in the prior art, the filter facility 1
Since there is no need to protrude above the sea surface to maintain the internal space, the filter facility 14 can be composed of only the parts necessary to achieve the original function, and it is necessary to provide extra parts other than that. Is eliminated, thereby enabling cost reduction. In addition, since the construction of the filter facility 14 does not require an auxiliary construction method such as ground improvement or freezing as in the related art, the construction period and construction cost can be reduced.

Further, the construction of the filter facility 14 simply involves placing and fixing the lower pipe 21, the upper pipe 28 and the filter section 34 on the shield tunnel 12 in this order. The temporary construction can be made smaller than when the construction is performed by the caisson method or the caisson method using a steel shell. Therefore, the construction period and construction cost of the filter facility 14 can be reduced.

In the above embodiment, as shown in FIG. 4, the case where the packing 21a is disposed between the segment 12a of the shield tunnel 12 and the lower pipe 21 to prevent water leakage has been described. As shown in FIG. 14, instead of the packing 21a, the segment 12a and the lower pipe 2
A rubber tube 45 is disposed around the entire circumference of the shield tunnel 12, and water is injected into the rubber tube 45 from inside the shield tunnel 12 to expand the rubber tube 45.
And the lower pipe 21 can be sealed.

The construction procedure when the rubber tube 45 is used is different from that when the packing 21a is used as described below. That is, in this case, first, before attaching the lower pipe 21 to the shield tunnel 12, the rubber tube 45 is attached. At this time, an injection port 46 is provided in the rubber tube 45, and the injection port 46 is connected to an injection port mounting portion (not shown) of the lower pipe 21.
Fixed to

In order to perform the work of injecting water into the rubber tube 45 from the inside of the shield tunnel 12, a pipe (or copper tube) 47 connected to the injection port 46 of the rubber tube 45 is once taken out of the lower pipe 21. Then, it is returned to the lower pipe 21 again at an appropriate position. In the lower pipe 21, a copper tube 48 of an appropriate length is connected to the pipe 47. In the middle of the copper tube 48, a valve 49 is provided.
Connect.

Next, the lower pipe 21 to which the rubber tube 45 is attached is placed at a predetermined position in the shield tunnel 12, and the fixture 22 of the lower pipe 21 is attached to the shield tunnel 12.
To the bracket 17 with bolts and nuts.

Next, the tip of the copper tube 48 attached to the lower pipe 21 is connected to the injection hole 5 of the segment 12a.
0, for example, by a one-touch joint 51 or the like.
Further, a skirt member 52 which can be stretched and contracted is attached to the lower end edge of the lower pipe 21 in advance, and after attaching the lower pipe 21 to the segment 12a, the skirt member 52 is extended and fixed to the segment 12a with bolts. These connections are performed by divers. The attachment position of the attachment 22 is set so as not to hinder these operations.

After the lower pipe 21 is attached in this manner, the RC pipe is mounted in the same manner as in the case where the packing 21a is used.
Attach the mold 26 (FIG. 6) and attach the upper pipe 28 of the filter facility 14 to the lower pipe 21 (FIG. 7).

Thereafter, as in the case where the packing 21a is used, the formation of the base 31 (FIG. 8) and the RC form 2
6, placing the underwater concrete 32 inside the inner cylinder and the outer cylinder (FIG. 9), erecting the side pole 33, and setting the filter portion 3
4 (FIG. 10) and backfilling of the soil 37 (FIG. 11).

Next, as shown in FIG. 14, water is injected from the inside of the shield tunnel 12 into the rubber tube 45 through the copper tube 48, the valve 49 and the pipe 47 at a predetermined pressure. Then, the rubber tube 45 expands due to the water pressure, and the gap between the segment 12a of the shield tunnel 12 and the lower pipe 21 is sealed.

Next, the lower pipe 21, the upper pipe 28, and the shield tunnel 12 are drained, and then a water leakage test (FIG. 12) is performed. At this time, if there is water leakage, high-pressure water is further injected into the rubber tube 45 to perform a water leakage test.
When it is confirmed that there is no water leakage, the segment 12a of the shield tunnel 12 is dismantled and the through hole 38 (FIG.
Form 3). In this case, the valve 49 of the copper tube 48 is closed so that the water in the rubber tube 45 (FIG. 14) does not flow backward. After the formation of the through holes 38, mortar is injected into the rubber tube 45 and replaced with water. In addition, in the space surrounded by the segment 12a, the rubber tube 45, and the lower pipe 21, the injection hole 53 of the segment 12a is provided.
Inject mortar from.

As described above, when the rubber tube 45 is used, even if the positional relationship between the shield tunnel 12 and the lower pipe 21 is slightly shifted, the shift can be absorbed by the expansion of the rubber tube 45. Lower piping 21
Can be easily attached and water leakage can be reliably prevented.

In the above-described embodiment, the case where the RC formwork 26 is used to connect the shield tunnel 12 and the filter facility 14 has been described. However, a steel formwork may be used instead. Can be. Furthermore, in the above-described embodiment, the case where the present invention is applied to a water pumping station is described. However, the present invention is not limited to this, and can be applied to various pumping stations such as a drainage pumping station.

[0039]

As described above, according to the method for connecting an underwater structure and a shield tunnel according to the present invention, the underwater structure whose internal space is maintained by the inundation prevention means and the shield tunnel are made of concrete having waterproofness. When a through hole is opened from the inside of the shield tunnel to the partition wall between the shield tunnel and the underwater structure, flooding and sediment may flow in from the junction between the shield tunnel and the underwater structure. Can be prevented.

Therefore, unlike the conventional case, it is not necessary to protrude the underwater structure above the sea surface to maintain the internal space.
The underwater structure can be composed of only the parts necessary to achieve the original function, and there is no need to provide any extra parts, so that the cost can be reduced. Further, since it is not necessary to perform an auxiliary construction method such as ground improvement or freezing as in the related art in order to construct an underwater structure, the construction period and construction cost can be reduced.

Furthermore, since the underwater structure is merely fixed at a predetermined position in the shield tunnel, it is necessary to construct the underwater structure by a conventional method such as a deadline method, a caisson method using Tsukishima or an installation caisson method using a steel shell. In comparison, temporary construction can be made smaller. Therefore, the construction period and construction cost of the underwater structure can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining a work procedure (1/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 2 is a cross-sectional view illustrating a work procedure (2/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 3 is a cross-sectional view illustrating a work procedure (3/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 4 is a cross-sectional view showing packing between a shield tunnel and a lower pipe.

FIG. 5 is a cross-sectional view for explaining a work procedure (4/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 6 is a cross-sectional view illustrating a work procedure (5/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 7 is a cross-sectional view illustrating a work procedure (6/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 8 is a cross-sectional view illustrating a work procedure (7/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 9 is a cross-sectional view for explaining the work procedure (8/12) of the method of connecting the underwater structure and the shield tunnel according to the present invention.

FIG. 10 is a cross-sectional view for explaining the work procedure (9/12) of the method of connecting the underwater structure and the shield tunnel according to the present invention.

FIG. 11 is a cross-sectional view illustrating a work procedure (October 12) of the method of connecting the underwater structure and the shield tunnel according to the present invention.

FIG. 12 is a cross-sectional view for explaining an operation procedure (11/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 13 is a cross-sectional view illustrating a work procedure (12/12) of a method of connecting an underwater structure and a shield tunnel according to the present invention.

FIG. 14 is a diagram showing a rubber tube between a shield tunnel and a lower pipe.

[Explanation of symbols]

 11 Sea floor 12 Shield tunnel for water flow 13 Sediment 14 Filter facility (underwater structure) 26 RC formwork 32 Underwater concrete 38 Through hole

Continuing on the front page (72) Kenichi Sano 15-1, Ushijima-cho, Toyama City, Toyama Prefecture Hokuriku Electric Power Company (72) Inventor Hideo Omura 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Corporation (72) Inventor Toshiaki Inazu 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industries Co., Ltd. (72) Inventor Toshihiko Miwa 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industries Co., Ltd. (72) Inventor Kenji Tobata 2- 10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. Inside

Claims (2)

[Claims] 1. A method for removing sediment on a shield tunnel provided in the ground at the bottom of a water floor, installing a formwork at a predetermined position in the shield tunnel, and preventing inundation in an underwater structure to be connected to the shield tunnel. And attaching the underwater structure to the shield tunnel in the formwork, casting concrete having water stoppage in the formwork to join the shield tunnel and the underwater structure, An underwater structure and a shield tunnel, wherein the underwater structure and the shield tunnel are connected by opening a through hole from the inside of the shield tunnel to a partition wall between the structure and the shield tunnel. Connection method. 2. The shield tunnel is a shield tunnel for water flow connected to an intake pump or a drain pump of a thermal power plant, and the underwater structure is a filter facility provided at a tip of the shield tunnel for water power. The method according to claim 1, wherein the underwater structure is connected to a shield tunnel.