JP2779682B2 - Propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a propulsion device excellent in workability.

<Conventional Technology> As a method of constructing an underwater tunnel, there is known a submerged construction method in which a part of a land-based tunnel (tunnel element) is successively extended while submerging the tunnel in the trench of the tunnel.

<Problems to be solved by the present invention> In the submerging method, there are many offshore operations, and a large dockyard and a large submerged workboat are required.

Therefore, it has been pointed out that the construction period is prolonged and the construction cost is rising, and a proposal for an improvement plan is desired.

<Object of the present invention> The present invention has been made to solve the above problems, and an object of the present invention is to provide a propulsion device having excellent workability.

<Means for Solving the Problems> That is, the present invention relates to a tubular watertight chamber having one closed end,
A propulsion device comprising: a plurality of shield jacks that obtain a reaction force from an existing tunnel to apply a propulsive force to a water stop chamber; and a level adjusting ski provided on a front lower surface of the water stop chamber.

Further, the present invention provides a tubular water-stop chamber having one closed end, a plurality of shield jacks that obtain a reaction force from an existing tunnel to apply a propulsive force to the water-stop chamber, and a level adjustment provided on a front lower surface of the water-stop chamber. A ski and a water stopping chamber, a part of the water stopping chamber, an opening having a size that allows insertion of a ring piece that is a constituent material of the tunnel, and an upper end protruding above the water. This is a propulsion device configured to be attached to the outside of the opening.

<Description of the Present Invention> Hereinafter, the present invention will be described with reference to the drawings.

<A> Propulsion device FIG. 1 shows a propulsion device according to the present invention.

This propulsion device includes a tubular water-stop chamber 1 having one closed end, a plurality of shield jacks 3 that obtain a reaction force from an existing tunnel 2 to apply a propulsion force to the water-stop chamber 1, and a front part of the water-stop chamber 1. A level adjusting ski 4 provided on the lower surface is provided.

The propulsion device according to the present invention has an opening 5 in a part of the water stop chamber 1, that is, the upper half of the outer shell, and is provided with a carry-in cylinder 6 outside the opening 5.

The opening 5 and the carry-in cylinder 6 are set to have dimensions that allow the ring piece 7 as a tunnel constituent material to be carried in.

Also, a general shield excavator is provided with an assembling device or excavating means called an erector device for holding and assembling segments, but the shield excavating device according to the present invention does not include this type of assembling device or excavating means. .

In FIG. 1, reference numeral 8 denotes a stopper for opposing earth pressure or water pressure from the face, and is provided so as to be able to enter and exit the water stop chamber 1 or to be detachable.

9 is a sealing material provided at the tail of the water stopping chamber 1;
Is a trench opened at the bottom of the water, 11 is a foundation stone laid on the bottom of the trench 10, 12 is an injection material such as mortar filled between the existing tunnel 2 and the foundation stone 11, and 13 is an existing tunnel 2
And 14 is a work boat.

<B> Carry-in cylinder The carry-in cylinder 6 is a cylindrical body for introducing the ring piece 7 into the water-stop chamber 1 while preventing water from entering the water-stop chamber 1, and has a total length at least whose upper opening is higher than the water surface. The length protrudes upward.

Further, the carry-in cylinder 6 may be provided with a telescopic function so as to be able to cope with a change in water depth.

<C> Level Adjustment Ski The level adjustment ski 4 is a member for adjusting the level of the water stopping chamber 1 and is constituted by a plate-like ski or a tire sliding on the upper surface of the foundation stone 11.

The level adjusting ski 4 may be provided with a telescopic function, or the level adjusting ski 4 may be provided before and after the water stop chamber 1.

<D> Ring Piece The conventional segment has an arc shape, but the ring piece 7 used in the present invention is, for example, a ring-shaped or rectangular one in which a tunnel is cut into a certain width.

<Operation> Next, the construction method of the underwater tunnel will be described.

<A> Dredging (FIG. 1) Using a well-known excavator on the water floor, the trench 10 is cut in accordance with the shape of the tunnel, and the foundation stone 11 is leveled to a predetermined level if necessary.

<B> Hanging of Ring Pieces (FIG. 1) A ring piece 7 is manufactured on land or on a boat on water, and the ring piece 7 is hung into the water-stop chamber 1 through the carry-in tube 6.

Since the carry-in cylinder 6 protrudes above the water, there is no need to worry about inundation into the propulsion device.

After inserting the ring piece 7 into the water stop chamber 1 as shown in FIG. 2, the suspension wire is removed.

<C> Connection of ring piece The stopper 8 shown in FIG. 1 is removed or retracted.

Next, as shown in FIG. 2, the shield jack 3 is extended and the ring piece 7 is pressed against the tip of the existing tunnel 2, and a space between the ring piece 7 and the existing tunnel 2 is formed by a PC bolt or the like.
Tighten and connect with a PC cable.

<D> Propulsion (FIG. 3) When the connection of the ring pieces 7 is completed, the shield jack 3 is further extended, and while obtaining the reaction force from the existing tunnel 2, the water stop chamber 1 is propelled by one or several pieces.

At this time, the level adjustment ski 4 keeps the posture of the water stop chamber 1 while sliding on the foundation stone 11.

An injection material 12 such as mortar is filled between the foundation stone 11 and the existing tunnel 2 after passing through the propulsion device.

<E> Covering soil The upper part of the existing tunnel 2 exposed in the trench 10 is covered with the covering soil 13.

The tunnel is constructed to a predetermined length while repeating the above-described steps.

<Other Embodiment 1> In the above embodiment, the case where the ring piece 7 is connected to the tip of the existing tunnel 2 has been described.

In the case of this embodiment, as shown in FIG. 4, the carry-in cylinder 6 of the propulsion device becomes unnecessary.

<Other Embodiment 2> Further, an opening for introducing a ring piece may be provided on a part of the peripheral surface of the water-stop chamber 1 in FIG. 1, and a valve device which can be opened and closed in place of the carrying cylinder 6 may be provided in this opening. Good.

In the case of this embodiment, it is necessary to provide a movable bulkhead at the tip of the existing tunnel or the tip of the ring piece.

<Effects of the Present Invention> The present invention has the following effects.

<A> The manufacturing cost of the propulsion device can be significantly reduced.

<B> The level adjustment ski makes it easy to control the attitude of the propulsion device.

<C> Since excavation work and tunnel construction work can be performed in parallel, the construction method is excellent and the construction period can be significantly reduced.

<D> Unlike the shield method and caisson method, pneumatic work is not required, so the work is safe, and construction is possible even when the construction depth is considerably deep.

<E> When the tunnel is constructed by suspending the ring pieces in the propulsion device, the occupation time in the sea area can be reduced due to the advantage of the short on-site work time, which is a feature of the prefabricated construction method.

<F> By using a propulsion device of a different diameter, it is possible to cope with a change in the tunnel cross-sectional diameter.

[Brief description of the drawings]

Fig. 1: Cross-sectional view of the propulsion device Fig. 2: Cross-sectional view of the propulsion device when the ring piece is assembled Fig. 3: Cross-sectional view of the propulsion device during propulsion Fig. 4: Cross-sectional view showing another propulsion device

Claims (2)

(57) [Claims] 1. A cylindrical water-stop chamber having one closed end, a plurality of shield jacks for obtaining a reaction force from an existing tunnel to apply a propulsive force to the water-stop chamber, and a level provided on a front lower surface of the water-stop chamber. Propulsion device with adjustable skis. 2. A watertight cylindrical chamber having one closed end, a plurality of shield jacks for obtaining a reaction force from an existing tunnel to apply a propulsive force to the watertight chamber, and a level provided on a front lower surface of the watertight chamber. An adjustable ski is provided, and a part of the water-stop chamber has an opening with a dimension that allows the insertion of a ring piece, which is a constituent material of the tunnel, and a cylindrical body for carrying the ring piece whose upper end protrudes above the water. A propulsion device configured to be attached to the outside of the opening.