JPH0357244B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a floating storage anti-icing structure used to protect internal waters or facilities and structures from drift ice in frozen areas. .

(Prior art) As a conventional example of a floating anti-icing structure used to protect the inner sea area or structures etc. from drift ice in frozen areas, there is one described in Japanese Patent Publication No. 59-47093. be. As shown in FIG. 3, the floating anti-icing structure disclosed herein has an inverted trapezoidal cross section and is attached to the outer wall of a buoyant body F moored by a tension cable W in the direction indicated by an arrow A. There is an inclined surface S that is inclined so as to push and bend the flowing ice I downward and break it, and by using this inclined surface S, the ice force of the drift ice I is reduced, and at the same time, by arranging the buoyant body F itself in a circular shape, As shown in FIG. 4, the drift ice I flowing in the direction of arrow A moves in the leeward left-right direction along the outer periphery of the circular buoyant body 1 in an attempt to further reduce the ice power of the drift ice I.

(Problems to be Solved by the Invention) In the above-mentioned conventional case, the buoyancy body has an inverted trapezoidal cross section, and if the buoyant body is applied to reduce the ice force of the drift ice due to the slope, it becomes extremely unstable. However, there were problems in that it was difficult to obtain sufficient inertia and buoyancy, and in order to increase stability and obtain sufficient buoyancy, the buoyant body itself had to be large and heavy. .

In view of the above-mentioned conventional drawbacks, the present invention provides a floating storage type anti-icing structure that can obtain sufficient inertia and buoyancy by utilizing the buoyancy of drift ice itself and is highly stable. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the gist of the present invention is to provide a structure that is protruded downward from the lower surface of the floor slab on the side from which the drift ice enters, and that intersects with the direction in which the drift ice enters. A front buoyancy chamber is provided, which is arranged continuously along the direction of The floating structure includes a front inclined wall having an extension extending above the floor slab, and the floor slab on the side of the rear buoyancy chamber is provided with a rear ice-stopping wall extending below the lower end of the rear buoyancy chamber. Exists in storage type anti-icing structures.

(Function) The floating storage type anti-icing structure according to the present invention has front buoyancy chambers that protrude downward from the lower surface of the floor slab on the side where the drift ice enters and are continuously arranged along the direction intersecting the direction of the drift ice approach. and a rear buoyancy chamber that is arranged continuously at a predetermined distance from the front buoyancy chamber to maintain a stable posture at all times. The extension part that extends above the floor slab guides the incoming drift ice downward, and further takes it below the floor slab along the front slanted wall, and prepares it for the floor slab on the rear buoyancy chamber side. The captured drift ice is held below the deck by the rear ice wall extending below the lower end, and the buoyancy of the drift ice itself can be used to increase inertia and buoyancy.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings.

1 and 2 are a perspective view and a cross-sectional view, respectively, showing an embodiment of a floating storage type anti-icing structure according to the present invention.

The anti-icing structure includes front buoyancy chambers 2 that protrude downward from the lower surface of the floor slab 1 on the side where the drift ice I enters and are continuously arranged along a direction intersecting the direction in which the drift ice I enters.
, a rear buoyancy chamber 3 that is consecutively arranged at a predetermined interval from the front buoyancy chamber 2, and a central buoyancy chamber 4 that is consecutively arranged in the center of these front buoyancy chambers 2 and rear buoyancy chamber 3, ensuring constant stability. I am now able to maintain this posture. In addition, the anti-icing structure has an extension 2b extending above the floor slab 1 at the upper end of the front inclined wall 2a which is provided in the front buoyancy chamber 2 and slopes downward in the rearward direction, so as to move the drifting ice I downward. A rear ice-stopping wall 3a is provided on the floor slab 1 on the side of the rear buoyancy chamber 3 and extends below the lower end of the rear buoyancy chamber 3. The taken-in drift ice I is held below the floor slab 1 so as not to escape, and the buoyancy of the drift ice I itself can be used to increase inertia and buoyancy.

The floor slab 1 has a rectangular shape, and is maintained in a substantially horizontal position by the buoyancy of the front buoyancy chamber 2, the rear buoyancy chamber 3, and the central buoyancy chamber 4.

The front buoyancy chambers 2 protrude downward from the lower surface of the side of the floor slab 1 from which the drift ice I enters, and are continuously arranged along the direction intersecting the direction of the drift ice I. It comprises a slanted wall 2a and a substantially vertical vertical wall 2c on the rear side, a lower end 2d has an arcuate cross section, and a wall extending over the entire width of the floor slab 1 to above the floor slab 1 at the upper end of the front slanted wall 2a. extension part 2b
The front inclined wall 2a is made thicker than the vertical wall 2c to withstand the force of drifting ice.
The front buoyancy chamber 2 is hollow with both ends sealed by cover walls 2e.

The rear buoyancy chambers 3 are arranged continuously and approximately symmetrically with respect to the center line C of the central buoyancy chamber 4 at a predetermined distance from the front buoyancy chamber 2, and have a rear sloped wall 3b that slopes downward in the front direction, and approximately the front side. It has a vertical wall 3c, a lower end 3d has an arcuate cross section, the vertical wall 3c extends below the lower end of the rear buoyancy chamber 3 itself to form a rear ice-stopping wall 3a, and both ends are covered with a lid wall 3e. I feel hollow because of the secret information.

The central buoyancy chamber 4 has a substantially symmetrical cross-sectional shape with a downward taper, the lower end 4a has an arcuate cross section, and is continuously arranged at a predetermined interval in the center of the front buoyancy chamber 2 and the rear buoyancy chamber 3. Both ends are sealed with a lid wall 4b and are hollow.

Thus, a recess 8 and a recess 9 are formed between the front buoyancy chamber 2 and the center buoyancy chamber 4 and between the center buoyancy chamber 4 and the rear buoyancy chamber 3, respectively.

Front buoyancy chamber 2, rear buoyancy chamber 3 and center buoyancy chamber 4
A front partition wall 5 and a rear partition wall 6 are provided in the recesses 8 and 9 between the buoyancy chambers, respectively, extending downward from the lower surface of the floor slab 1 along the transverse plane of each buoyancy chamber. The front partition wall 5 has a vertical dimension slightly smaller than the depths of the front buoyancy chamber 2 and the center buoyancy chamber 4. The rear partition wall 6 has approximately the same vertical dimension as the front partition wall 5 on the side of the central buoyancy chamber, and is aligned with the lower end of the rear ice wall 3a on the side of the rear buoyancy chamber.

Next, the method of using the anti-icing structure according to the above configuration of the present invention and the behavior of drift ice will be explained using an example in which a structure in an icy area is protected from drift ice.

A plurality of anti-icing structures according to the present invention are arranged at predetermined positions around the structure to be anti-icing, and are floated in a state surrounding the structure to be anti-icing. One end is tied to a designated location and moored. The drift ice I that is rushing towards me is the front sloped wall 2a.
When it hits the extended portion 2b, it is deflected diagonally downward, creating cracks along the continuous direction of the front buoyancy chamber 2, and the front slanted wall 2a is tilted against its own buoyancy due to the force of the drift ice. It descends along the surface, crosses the lower end 2d of the front buoyancy chamber 2, and then rises due to buoyancy, and is taken one after another under the floor slab 1 between it and the central buoyancy chamber 4, and is stored there. In this way, as the downward recess 8 between the front buoyancy chamber 2 and the central buoyancy chamber 4 becomes nearly full with the drift ice I, a portion of the drift ice I is transferred to the lower end 4a of the central buoyancy chamber 4.
More ice moves beyond the center buoyancy chamber 3 toward the rear buoyancy chamber 3, rises toward the floor slab 1 due to buoyancy, is taken into the recess 9 between the central buoyancy chamber 4 and the rear buoyancy chamber 3, and is trapped in the rear buoyancy wall. At 3a, the water is prevented from flowing backward and is also stored there. Due to the weight and buoyancy of the stored drift ice I, the stability of the anti-icing structure is improved by increasing inertia and buoyancy when the floor slab 1 is held substantially horizontally.

According to the above embodiment, the floating storage type anti-icing structure is approximately symmetrical with respect to the center line of the central buoyancy chamber 4, so the overall balance is good, and the floating storage type anti-icing structure has the central buoyancy chamber 4. Since it has a cross-sectional shape that tapers downward, the drift ice I flows from the front side to the rear side.
The transition is smooth, the drift ice I can be stored on both the front side and the rear side of the central buoyancy chamber 4, and the stability is very good.Since it has a front partition wall 5 and a rear partition wall 6, It is also possible to reliably prevent the drift ice I from flowing away from the sides.

In addition, the floating storage type anti-icing structure according to the present invention includes:
The length, width, spacing, angle, and other dimensions of each part can be determined rationally based on knowledge of sea ice engineering and structure design methods.

(Effects of the Invention) The present invention is configured as described above, and includes a front buoyancy chamber that protrudes downward from the lower surface of the floor slab on the side where the drift ice enters and is continuously arranged along a direction intersecting the direction in which the drift ice enters; By providing a rear buoyancy chamber that is continuously arranged at a predetermined interval from the front buoyancy chamber, a stable posture is maintained at all times, and the front buoyancy chamber is tilted backward and downward, and the upper end thereof is connected to the floor slab. By providing a front sloped wall with an extension extending upward, it is possible to guide the incoming drift ice to the bottom of the floor slab, and the floor slab on the side of the rear buoyancy chamber is provided with a wall of the rear buoyancy chamber. By being equipped with a rear ice wall that extends below the lower end, it is possible to retain the captured drift ice without washing away and prevent the drift ice from entering the interior, and to utilize the buoyancy of the captured drift ice. to increase inertia and buoyancy,
The stability of the anti-icing structure itself can be improved, and since it is a floating type, it does not receive large forces from waves, and the mooring rate can be installed and removed relatively easily, making it easy to move and reuse. It also has the following effects and can be applied even in relatively deep water.

[Brief explanation of drawings]

1 and 2 are perspective views and cross-sectional views, respectively, showing an embodiment of a floating storage type anti-icing structure according to the present invention, and FIGS. 3 and 4 show a conventional floating type anti-icing structure. They are a side sectional view and a plan view, respectively. 1...Floor slab, 2...Front buoyancy chamber, 2a...Front slanted wall, 2b...Extension part, 2c...Vertical wall, 2d...
...lower end, 2e...lid wall, 3...rear buoyancy chamber, 3a
... Rear ice wall, 3b ... Rear sloped wall, 3c ... Vertical wall, 3d ... Lower end, 3e ... Lid wall, 4 ... Central buoyancy chamber, 4a ... Lower end, 4b ... Lid wall, 5... ...Front bulkhead, 6...Rear bulkhead, 7...Mooring cable, 8,9
...Concavity.

Claims (1)

[Claims] 1 Front buoyancy chambers that protrude downward from the lower surface of the side of the floor slab where the drift ice enters and are arranged continuously along a direction intersecting the direction of the drift ice approach; the front buoyancy chamber is provided with a front slanted wall having an extension portion that slopes backward downward and whose upper end extends above the floor slab; A floating storage type anti-icing structure characterized by comprising a rear ice wall extending below the lower end of the rear buoyancy chamber.