JP3533525B2 - Submarine tunnel construction method and box joining device - 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 constructing a water-bottom tunnel and a box joining device for constructing a box made of precast by immersing it in the water bottom.

[0002]

2. Description of the Related Art A box constructed from a conventional production yard
A method of constructing an underwater tunnel by towing and sunk to the destination was used. Usually, the box to be laid has a length of about 100 m to 140 m, and therefore, a box like a dock at a shipyard was constructed near the construction site to manufacture the box. In addition, the manufactured box is too heavy to be lifted by an ordinary crane, so the front and rear of the box are blocked with bulkheads,
It was transported to the destination by floating on the water and towing.

[0003]

The above-mentioned conventional method of constructing a subsea tunnel has the following problems. <A> In order to construct a dock-type production yard required to produce a box with a box length of more than 100 m, it is necessary to secure a vast site and incur significant construction costs. <B> When transferring a long box, deformation and stress that do not occur after sunk may occur, so reinforcement is necessary for that purpose. <C> When constructing a new underwater tunnel adjacent to the existing underwater tunnel, if a long box is to be installed at one time, the effect on the existing underwater tunnel cannot be avoided. Therefore, it is necessary to take countermeasures such as excavation after reinforcing the existing subsea tunnel.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method of constructing a subsea tunnel which can be easily constructed. In particular,
An object of the present invention is to provide a method for constructing a water-bottomed tunnel that can reduce construction costs by manufacturing a box on land and transporting and sunk the box using a general-purpose crane ship. Moreover, it aims at providing the construction method of the submarine tunnel which does not need to reinforce a box specially for transportation and subsidence. Furthermore, the box can be sunk easily and securely.
An object of the present invention is to provide a joining device for boxes that can be joined. And it aims at providing the construction method of the water bottom tunnel with little influence on the surrounding environment. The present invention achieves at least one of these objectives.

[0005]

In order to achieve the above object, the method of constructing a water-bottomed tunnel according to the present invention is designed so that water can freely enter without providing a partition wall at the end portion in the penetrating direction. the box body provided with a fitting shape lifting with a crane, after transported to a predetermined position, comprising the the inner wall surface of a box body by attaching the ends of the sheets constitute an air bag and the inner wall surface and said sheet This is a method of lowering the box while adjusting the buoyancy with a sheet-shaped airbag and joining the box to the existing box that has been previously sunk. Also, hoist a box with a fitting shape at the end in the penetration direction with a crane,
After transporting to a predetermined position, combine the protrusion provided on the box to be lowered with the guide provided on the existing box that was previously sunk, and adjust the buoyancy by adjusting the buoyancy with the airbag provided on the box. The method is characterized in that the box is lowered along the guide tool, and when the protrusion tool reaches the end of the guide tool, the box is rotated to join the existing box. Here, in the above-described method of constructing a water-bottomed tunnel, by adjusting the buoyancy of the box from above the water, the balance of the box when descending can be adjusted.

Further, the box joining device of the present invention is provided with a projecting member which is provided in the box to be lowered and which projects in the penetrating direction of the box.
And a guide tool extending in the direction of the water surface provided in a sunk existing box, and when the projection tool and the guide tool are combined, the projection tool moves along the guide tool, and the guide tool moves to the end of the guide tool. It is characterized in that when the projection tool arrives, the box provided with the projection tool rotates around the terminal end.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<A> Box The box 1 is a structure forming a subsea tunnel. A water bottom tunnel is constructed by joining a plurality of boxes 1 at the water bottom. The cross-sectional shape of the box 1 can be arbitrarily selected, such as a rectangle or an ellipse. Normally, a box culvert type box 1 having a rectangular cross section as shown in FIG. 5 is used. An end portion of the box body 1 in the penetrating direction is formed in a fitting shape. For example,
A fitting protrusion 12 is formed at the end on the side of the existing box 1b, and a fitting recess 11 is formed at the end on the opposite side. Adjacent box 1
It is preferable that the box 1 is manufactured by a match casting method so that the fitting convex portion 12 and the fitting concave portion 11 are fitted with each other accurately. The fitting shape is not limited to the concavo-convex shape shown in FIG. 1, and may be a combination of tooth forms or a plurality of male and female joints arranged (not shown). Box 1
Usually, the bulkhead 15 and the like are not provided in a and 1b so that water can freely enter. The bulkheads 15 can be provided in the box 1c arranged at predetermined intervals. The box length of the box 1 is, for example, 20 to 30.
Set to about m. Since the box 1 used in the present invention is hoisted and transported by a crane, it is preferable to use a box shorter than the box length conventionally used in the burial method. The boxes 1c provided with the bulkheads 15 are arranged at intervals of 100 to 150 m, for example, in the length of a water bottom tunnel.

<B> Airbag The air bag 2 is arranged to inject gas to adjust the buoyancy of the box 1. The form of the airbag 2 is a sheet.
There is . When the airbag 2 is formed of a sheet-shaped material, the end portion of the sheet is attached to the inner wall surface of the box body 1 so that the gas does not leak. That is, the inner wall surface of the box 1
It constitutes a part of the airbag 2 (see FIG. 3).
See). Since the case 1 has a penetrating structure that allows the entry of outside water into the inside, the buoyancy of the case 1 can be adjusted depending on the size of the airbag 2. Further, by adjusting the buoyancy, it is possible to adjust the balance of the box 1 when descending. The airbag 2 can be configured so that it can be inflated or deflated from a compressor 21 arranged on board or on land via an air hose 22 (see FIG. 3). Alternatively, the airbag 2 may be inflated in advance before the box 1 is sunk so that no gas is sent to the airbag 2 during the descent.

<C> Box Joining Device The joining device for the box 1 is composed of a projection tool 31 provided on the newly sunk box 1a and a guide tool 32 provided on the already sunk existing box 1b. The projecting tool 31 is attached to almost the tip of the box 1a, and is arranged so that the tip of the projecting tool 31 projects in the penetrating direction of the box 1a. The guide 32 is the existing box 1
It is attached to the rear end of b and is arranged so that the longitudinal direction of the elongated guide tool 32 is the water surface direction. The guide tool 32 serves as a guide for the projection tool 31, and the projection tool 31 combined with the guide tool 32 moves along the guide tool 32. Note that the attachment positions of the protrusion 31 and the guide 32 are not limited to the upper surface of the box 1, but may be the side surface.

<D> Water-stopping material The water-stopping material 5 is arranged at the end of the box 1 in order to improve the water-stopping property of the joint between the boxes 1a, 1b, 1c. As the water blocking material 5, for example, a primary water blocking material 51 and a secondary water blocking material 52 can be used. The primary water blocking material 51 is, for example, a linear water blocking seal placed on the end faces where the box bodies 1 face each other, and is attached to the end surface of the box body 1 in two annular shapes as shown in FIG. As the primary water blocking material 51, a known water blocking material such as a rubber seal or a gasket can be used. This primary water blocking material 51 is a box 1a.
When pressed against the existing box body 1b, the box body 1 is deformed by its own weight, inertial force, pulling force, etc. to exhibit water stopping performance. The secondary water blocking material 52 is, for example, the water blocking material 5 which is attached from the inside after the temporary joining is completed and the inside of the box 1 is drained. For example, a waterproof rubber having an Ω cross section can be used (see FIG. 4). The secondary water blocking material 52 is attached so as to straddle between the boxes 1 and 1.

Embodiments of the present invention will be described below with reference to the drawings.

<A> Manufacturing of Box (FIG. 2) The box 1 is manufactured in a manufacturing yard on land. In the manufacturing yard, a transfer device 8 such as a water caster or a roller conveyor that uses fluid pressure is installed. Then, the lower floor slab 13, the side wall 14, and the upper floor slab of the box 1 are sequentially manufactured by a flow work.
At this time, if the match cast method of manufacturing the next box 1 by using the end of the box 1 previously manufactured as a frame, the joint part can be manufactured with high accuracy. The completed box 1 is lifted by a crane 4 using a wire 41 or the like and transported to a destination. Since the box 1 of the present invention is large enough to be lifted by the crane 4, it can be easily transported.

<B> Sinking of the Box (FIG. 1) The place where the box 1a is to be set is dredged or excavated beforehand as needed, and the crushed foundation stone 72 and the bag-shaped mortar pack are laid. Since the box 1 of the present invention is of a small scale, even if excavation is carried out to install the box 1, the box 1a has a small influence on the surrounding environment, and after the box 1a has been transported to a position above the sunk site, the box 1a The protrusion 31 attached to the above is combined with the guide 32 extending from the existing box 1b. The setting of this joining device does not necessarily have to be performed from the surface of the water, and when the tip of the guide tool 32 is underwater, the box 1a may be lowered to that point and then combined. Box 1
a is descended to the vicinity of the existing box 1b while being guided by the guide 32 in an oblique state in which the side of the existing box 1b is slightly lowered. Then, when the projecting tool 31 reaches the receiving portion 33 provided at the end of the guiding tool 32, the descent stops and the box 1a starts to rotate. Since the airbag 1 is provided in the box 1a, the balance of the box 1a can be adjusted by the amount of gas sent from the compressor 21 to the airbag 2 via the air hose 22 (see FIG. 3). Therefore, the box 1a can be softly attached to the bottom.

<C> Joining of Box (FIG. 1) When the projection 31 reaches the end of the guide 32, the box 1
a starts to turn. Then, the fitting convex portion 12 of the box 1a is fitted into the fitting concave portion 11 of the existing box 1b. When the box 1a collides with the existing box 1b, the primary water blocking material 51 is deformed and the primary water blocking is completed. Connecting steel rod 6 between boxes 1a and 1b
1, 62 and the like are arranged to perform temporary joining (see FIGS. 4 and 5). After the box body 1 is sunk, the foundation mortar 71 and the like is poured into the lower part of the box body 1 to build the foundation.
The airbag 2 is adjusted so that excessive ground pressure does not act until the strength of 1 is sufficiently expressed. The box 1c provided with the bulkheads 15 is arranged in the subsea tunnel at predetermined intervals. Secondary drainage is performed after draining the area partitioned by the bulkhead 15. The secondary water stop is
The secondary water stop material 52 is attached so as to straddle the joint between the boxes 1 from the inside of the water bottom tunnel (see FIG. 4). Then, the plurality of boxes 1 are integrated by introducing prestress by the PC steel wire 63 that is passed through the inside of the body. In addition, the submerged tunnel constructed as necessary will be covered with soil.
To do.

<D> Other Embodiments (FIGS. 5 and 6) As another form of the joining device, a form in which the guide tool 32 is not used can be implemented. In this case, the provisional receiving portion 34 is provided on the existing box 1b, and the box 1a is settled in a slightly separated state.
The protruding portion 31 of is placed on the temporary receiving portion 34. And box 1
A is drawn to the existing box 1b side with a jack or the like for joining.

[0017]

As described above, the method of constructing a submerged tunnel and the apparatus for joining boxes according to the present invention have the following effects. <B> Since the box can be lifted with a crane,
It is easy to transport and lay down, and you can easily construct a subsea tunnel. <B> Since the box is large enough to be lifted by a crane, it can be manufactured in a land-based manufacturing yard. Therefore, it is not necessary to construct a large-scale dock-type production yard, and the construction cost can be reduced. <C> Since the load that acts when transporting and sunk the box is small, no special reinforcement of the box is required and it is economical. <D> Since the joining is performed using the joining device provided in the box, the box can be sunk and joined easily and reliably.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a method for constructing a submarine tunnel of the present invention.

FIG. 2 is an explanatory diagram of an example of a process of manufacturing a box.

FIG. 3 is an explanatory diagram of an embodiment of a box body provided with an airbag.

4A and 4B are a cross-sectional view and an enlarged explanatory view of an embodiment of a joint portion between boxes.

FIG. 5 is a front view of an example of a box body provided with a temporary receiving portion.

FIG. 6 is an explanatory view showing a method of joining boxes when another embodiment of the joining device is used.

[Explanation of symbols]

1 ... Box 11 ... Mating recess 12 ... Mating projection 2 ... Airbag 31..Protrusion tool 32..Induction tool 4 ... Crane

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatoshi Kimura 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (56) Reference JP-A-6-193391 (JP, A) JP 2000-257093 (JP, A) JP-B-45-38469 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 29/073 E21D 10/14

Claims (4)

(57) [Claims] 1. A box which has a fitting shape at its end in the penetrating direction so that water can freely enter without a partition wall is lifted by a crane and is transported to a predetermined position. the sheet-shaped air bag formed by constituting the air bag at the inner wall surface mounted the ends of the sheet between the sheet and the inner wall surface,
A method for constructing a water-bottomed tunnel, wherein the box is lowered while adjusting the buoyancy, and the box is joined to an existing box that was previously sunk. 2. A lifting a box making body having a penetration direction of the end to fit the shape in a crane, after transported to a predetermined position, provided with a projection member provided on a box body to be lowered into the existing box making body obtained by sinking the previously The guide box is combined with the guide tool, and the box body is lowered along the guide tool while adjusting the buoyancy by an airbag provided in the box body, and the box body is moved when the protrusion tool reaches the end of the guide tool. A method of constructing a subsea tunnel, which comprises turning and joining to an existing box. 3. The method of constructing a water-bottom tunnel according to claim 1, wherein the buoyancy of the box is adjusted from above the water to adjust the balance of the box when descending. How to build. 4. A projecting tool provided in a box body to be lowered and projecting in a penetrating direction of the box body, and a guide tool extending in a water surface direction provided in a sunk existing box body, wherein the projecting tool and the guide tool are provided. When combined, the projection tool moves along the guide tool, and when the projection tool reaches the end of the guide tool, the box provided with the projection tool rotates from the end point as a base point, Body joining device.