JP3404564B2 - Saving caisson - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete partition wall caisson which constitutes a breakwater, a quay and the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional caisson has a vertical cylindrical outer wall 1 and a horizontal flat plate-shaped bottom plate 2 to form an inner filling space. With a large number of vertical flat plate-shaped partition walls 3, 3, ...
The water injection section of 5) is partitioned in a grid pattern. The outer wall 1, bottom plate 2, partition walls 3, 3, ... Of the caisson are integrally formed by reinforced concrete. Then, when the caisson is submerged, water is poured into each of a large number of water pouring sections.

[0003]

A large number of conventional partition walls 3,
The caisson equipped with 3 ... has problems such as high production cost and long production period because the amount of concrete, formwork, and reinforcing bar used is large. Further, in a caisson provided with a large number of partition walls 3, 3, ..., A restoring force that corrects the inclination is generated when the caisson is sunk, but if this restoring force is large, the shaking in the waves becomes large and the waves are easily affected. There was also a problem.

On the other hand, when the caisson is completely submerged and only a single water injection section is used, when the caisson is sunk,
Since the restoring force does not occur even if the caisson is tilted, there is a problem that construction costs are high, such as the need for support by auxiliary means such as a hoist ship.

In view of the above problems, the present invention reduces the caisson bulkhead as much as possible to reduce the manufacturing cost of the caisson, and when the caisson is sunk, an appropriate restoring force is generated when the caisson is tilted. The purpose is to construct without using auxiliary means such as a hoist ship.

[0006] wherein saving bulkhead caissons according to the present invention, a hollow box shape wadding space formed therein with a vertical cylindrical the outer wall and the bottom plate where the horizontal plate-shaped square, said in packed The space is a buoyancy-generating area with vertical partitions.
It is a caisson that is divided into an image and a water injection section, and can be sunk while adjusting the buoyancy by pouring water into the water injection section . A buoyancy generating section having a volume is formed by a partition wall, and the inside of the filling space excluding the buoyancy generating section is a single water injection section having a relatively large volume.

Incidentally, the buoyancy generating sections at the four corners are defined by caisson.
It is preferable to arrange them symmetrically with the center of gravity of the center as the center .

[0008]

1 is a plan view of a partition wall caisson according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view thereof. The partition wall-saving caisson is composed of a vertical (longitudinal) rectangular tubular outer wall (side wall) 11 and a horizontal (horizontal) flat plate-shaped bottom plate 12 in the shape of a hollow box with an open upper side. Inside 11, a filling space is formed.

Further, vertical (longitudinal) substantially L-shaped watertight partition walls 13, 13 ... Are provided at four corners of the packed space, and the partition spaces 13, 13 ... Is
A relatively large volume single water injection space A in the center (inner side),
It is partitioned into four buoyancy generating sections B, B ... Of relatively small volumes at the four corners (outer peripheral side). In addition, buoyancy generation section B,
B ... Are arranged symmetrically with the center of gravity of the partition wall caisson as the center.

The partition wall caisson thus constructed is
The outer wall 11, the bottom slab 12, the partition walls 13, 13 ... Are integrally formed by reinforced concrete, but the partition wall is smaller and smaller than the conventional lattice caisson, so the amount of concrete, rebar, formwork, etc. used is reduced. The production cost can be reduced. The outer wall 11 and the bottom slab 12 may be provided with a reinforcing portion or the like.

Further, if the buoyancy generating sections B, B ... Are made large, the buoyancy generating sections B, B .. , The buoyancy generating sections B, B ... Have a size such that a minimum necessary restoring force can be obtained. That is, by taking into consideration the size of the buoyancy generating sections B, B ..., the minimum necessary restoring force can be secured, and therefore, the sway in the waves during the sinking can be reduced.

Further, when the buoyancy generating sections B, B ... Are arranged at the four corners, the buoyancy generating sections B, B are separated from the center of gravity of the partition wall caisson.
The distance to (the point of buoyancy) is maximized, and the restoring force can be maximized with respect to the size of the buoyancy generating sections B, B .... That is, in order to secure the necessary restoring force, the size of the buoyancy generating sections B, B ... (Consequently, the partition walls 13, 13 ... Size) can be minimized.

FIG. 3 is a vertical cross-sectional view showing a method of depositing the partition wall caisson. When the partition-saving caisson is sunk, water is poured only into the central water injection section A, and the buoyancy generation sections B at the four corners are
Install in B ... without water injection. Therefore, only one set of water injection equipment is required.

When water is injected only into the water injection section A in this way,
When buoyancy acts on the buoyancy-generating sections B, B, and the partition wall caisson tilts, the buoyancy of the buoyancy-generating section B on the inclined side (lower side) becomes larger than the buoyancy of the buoyancy-generating section B on the opposite side. , The restoring force that corrects the tilt is generated. Therefore, the construction can be performed without being supported by auxiliary means such as a hoist ship, and the construction cost can be suppressed.

That is, when the caisson has no partition wall and only a single large-volume water injection section is formed, the caisson production cost can be significantly reduced, but a single water injection is performed when the caisson is sunk. Restoration force does not occur in the section, so auxiliary means such as a hoist ship are required, which increases construction costs. On the other hand, as mentioned above, when a small-volume buoyancy generating section is provided on the outer peripheral side of a single large-volume water injection section, it is possible to reduce partition walls while ensuring resilience, thus reducing manufacturing costs. In addition, the construction cost can be suppressed.

In the above embodiment, the buoyancy generating compartments are arranged at the four corners of the partition wall caisson to minimize the partition walls. However, the buoyancy generating compartments are not limited to the four corners and the outer circumference is more than the water injection compartment. It is only necessary to dispose it on the side, so that the number of partition walls can be reduced as compared with the conventional grid-shaped partition walls, and a restoring force can be generated at the time of deposition.

Further, in the above-mentioned embodiment, the case where water is poured only into the water injection section and not into the buoyancy generation section at the time of submersion is described, but the buoyancy generation section is also injected with a smaller amount of water than the water injection section, The optimum restoring force may be generated by adjusting the water injection amount.

[0018]

EFFECT OF THE INVENTION The partition wall caisson according to the present invention comprises a vertically-oriented cylindrical outer wall and a horizontally-oriented flat plate-like bottom plate to form an inner filling space, and the inner filling space is provided with a vertical partition wall. By dividing it into a relatively large volume water injection section on the side and a relatively small volume buoyancy generation section on the outer circumference side, the number of partition walls is reduced, so manufacturing costs can be reduced and at the time of sunk Can be constructed without supporting by auxiliary means such as a hoister ship, because the water is not injected or the amount of water injected in the buoyancy generating section is smaller than that in the water injecting section, so that a restoring force for correcting the inclination is generated. Further, by taking into consideration the size of the buoyancy generating section, it is possible to ensure the minimum necessary restoring force, and therefore to reduce the shaking during waves during the sunk.

Further, by forming the filling space with an outer wall of a quadrangular cylindrical shape and arranging the buoyancy generating sections at the four corners of the filling space, the distance from the center of gravity to the buoyancy generating section is maximized, which is necessary. The partition wall can be minimized in order to secure sufficient restoring force, and the manufacturing cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a partition wall caisson according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the partition wall caisson of FIG.

FIG. 3 is a vertical cross-sectional view showing a method for depositing the partition wall caisson of FIG.

FIG. 4 is a plan view of a conventional caisson.

[Explanation of symbols]

11 outer wall 12 Bottom plate 13 partitions A water injection section B Buoyancy generating section

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Claims (2)

(57) [Claims] 1. An outer wall in the shape of a quadrangular vertically oriented cylinder and a horizontally oriented flat wall.
It has a plate-shaped bottom plate and has a hollow box-like shape with a filling space formed inside, and the filling space has vertical partitions.
Is a caisson which is divided into a buoyancy generating section and a water injection section, and which can be submerged while adjusting the buoyancy by pouring water into the water injection section , and in which the four corners of the vertically-arranging rectangular tube are formed. A vertically oriented buoyancy generating section having a relatively small volume is formed by a partition wall, and the inside of the filling space excluding the buoyancy generating section
Is a partition wall caisson with a relatively large volume as a single water injection compartment. 2. The buoyancy generating sections at the four corners are defined as the center of gravity of the caisson.
The partition wall caisson according to claim 1, wherein the caisson is symmetrical with respect to the center .