JP2001214454A - Method of manufacturing concrete caisson on water and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing concrete caisson on water and its equipment which allow to manufacture large caissons on water surface with simple equipment and to manufacture an object with a structure which can easily manufacture a bottom plate and a foundation on the water floor integrally when installing the bottom plate. SOLUTION: A form 5 for the caisson is installed on water by being supported by a floating body 1 floating on the water. A hanger 9 for supporting the caisson is embedded in the form 5 and concrete is placed. The caisson which is manufactured while the hanger 9 for supporting the caisson is supported by the floating body 1 is hung. The form 5 is moved relatively toward the upper part of the caisson by letting out the hanger 9 for supporting the caisson and lowering the caisson into the water after waiting for hardening of the concrete. The next concrete is placed as a joint one after another.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a concrete caisson for use on a water surface, for producing a concrete caisson used for a breakwater, a quay or a seawall in a harbor.

[0002]

2. Description of the Related Art Conventionally, concrete caisson production has been performed in a dry space such as a caisson production yard having a ramp for launching and a lifting device, or a floating dock floating on the water surface. Using a sliding form, the partition wall and the peripheral wall are connected to the bottom plate at a predetermined height and spliced upward to form a predetermined size.

[0003] The concrete caisson manufactured in this way, which is manufactured in a production yard on land, is horizontally transported to a launching position such as a ramp or a lifting device, and is floated when manufactured in a floating dock. The docks themselves are submerged, each caisson is launched, floated on the surface of the water, and towed to the sink.

[0004]

Among the conventional methods for manufacturing a concrete caisson, when manufacturing in a dry space on land, a lifting device for launching and a device for horizontal movement are heavy. It must be able to withstand, the equipment is expensive and the heavy-duty caisson moving on land has many difficulties. In addition, there are few cases where caisson installation sites are located near the production yard, and in many cases, it takes a long time and a lot of expense to tow.

On the other hand, when a floating dock is used, there is an advantage that the water surface near the caisson installation site can be used, and the launching work is easy. In addition, there is a problem that the equipment becomes large-scale, and the construction and maintenance of the equipment require a large amount of expense.

Further, in the conventional method of this kind, it is necessary to float on the water by the buoyancy of the caisson itself and tow, and a bottom plate for closing the bottom surface is required. There was a problem that integration with the foundation was not easy.

The present invention has been made in view of such a conventional problem,
With the aim of providing a concrete caisson surface manufacturing method and a device capable of manufacturing a large caisson on the water surface with a simple device and easily manufacturing a structure capable of being constructed integrally with a submarine foundation at the time of installation of a bottom plate. It was done.

[0008]

SUMMARY OF THE INVENTION A feature of the concrete caisson water making method according to the present invention for solving the above-mentioned conventional problems and achieving the intended object is that the method is supported by a floating body floating above the water surface. Then, a caisson forming form is set on the water surface, concrete is poured into the form to form a caisson of a predetermined height, and at the same time, a caisson supporting hanging material is fixed to the caisson, and the caisson support is fixed. The caisson manufactured by supporting the hanging material on the floating body is hung, the caisson supporting hanging material is extended after the concrete is solidified, and the caisson is lowered into the water so that the formwork is raised above the caisson. To move the next concrete one after another.

In addition, a plurality of hanging beams are installed above the water surface with both ends supported by a floating body, and the caisson supporting hanging material and the caisson forming form are supported by the beams. It is preferable that a space for hanging is provided, and a caisson is hung in the space and sequentially lowered.

The concrete caisson manufacturing apparatus according to the present invention is characterized in that a floating body floated on the water surface, hanging means supported by the floating body, a caisson forming form supported by the hanging means, It is provided with a suspending member for suspending the caisson sequentially formed in the mold frame with respect to the suspending means, and a suspending means for extending the suspending member in the caisson descending direction.

The floating body is provided with a caisson hanging space having a U-shaped flat surface and an open side, and the caisson forming form and the caisson supporting hanging material are supported above the hanging space. Preferably, a plurality of beams are laid horizontally.

[0012]

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

In FIG. 1, reference numeral 1 denotes a floating body constituting the apparatus of the present invention. The floating body 1 is formed with a caisson hanging space 2 having a U-shaped plane and an open side, and a plurality of beams 3, 3... Constituting caisson hanging means above the space 2. Are suspended laterally with both ends thereof supported by a rising portion 4 rising from the surface of the floating body.

Above the space 2, there is provided a caisson forming form device 5 for supporting the beams 3, 3... And the rising portion 4 to form a vertical wall around the outer periphery of the caisson and a partition in the caisson. I have. The formwork apparatus 5 includes an outer formwork 6 for forming the outer surface of the caisson side wall, an inner formwork 7 for forming the inner surface of the side wall and the surface of the partition, and a form holding mechanism 8 for supporting these forms. The mold holding mechanism 8 is provided with a mold release mechanism (not shown) for separating each mold from the surface of the formed caisson.

[0015] In addition to the above, after the concrete of a predetermined height is poured into the formwork device 5, while the formwork is moved upward and the concrete is spliced, a rectangular tubular concrete structure is sequentially formed from the lower part. Sliding formwork can be used.

Each of the beams 3, 3,... Is provided with a large number of suspension means 9 for suspending a caisson supporting material 9 made of a deformed steel bar at predetermined intervals. is set up. As the suspension means, for example, a device using hydraulic pressure, commonly called a climbing jack, can be used.

Next, a method for constructing a concrete caisson on the water according to the present invention using the above apparatus will be described.

First, as shown in FIG. 1, the floating body 1 is floated on the water surface, and the formwork device 4 is assembled so that a concrete molding space is formed in a predetermined shape. The bottom is closed by the bottom form 12 and the lower end of the hanging material 9 suspended by the hanging means 10 is inserted into the concrete placing part 11.

Next, concrete 13 having a predetermined height is placed in concrete placing portion 11 in the form in which hanging material 9 is inserted.
And fix the lower end of the hanging material 9 to the concrete 13.

Incidentally, a fixing device (not shown) for retaining may be fixed to the lower end of the hanging member 9.

A caisson A without a bottom is formed by a predetermined height in this way, and after the concrete is solidified, the formwork device 5 is released, that is, the bottom formwork 12 is removed and each of the formworks 6, 7 is removed. Operate in the direction away from the concrete surface. The caisson A thus formed is suspended from the beams 3, 3.

In this state, each of the hanging means 10 is operated to slowly pull out the hanging material 9 and lower the caisson A until the upper end of the caisson A reaches above the lower edges of the lower frames 6 and 7. Thereafter, the molds 6 and 7 are assembled again into a predetermined shape, and concrete is poured to the next molding height.

As described above, the assembling of the formwork, the casting of the concrete, the removal of the mold, and the lowering of the caisson are sequentially performed at a constant height, and the concrete is spliced upward to form the final height. Further, the hanging members 9 are sequentially extended upward while being sequentially coupled upward using a coupling tool such as a coupler (not shown).

The caisson A thus formed is
Since it sinks in water in the middle of molding and exerts buoyancy on it, the floating body used supports the amount obtained by subtracting the buoyancy from the total weight of the completed caisson.

The caisson A thus manufactured is
In the state of being supported by the floating body 1 and suspended in the water, it is towed to a required installation place, lowered to the bottom of the water by the hanging means 10, and poured underwater concrete into the bottom as shown in FIG. Foundations 1 such as piles installed in advance
The bottom plate 15 can be formed integrally with the bottom plate 4.

Since the floating body 1 is formed in a U-shape,
For example, as shown in FIG. 7, a caisson can be manufactured in a state moored in contact with the quay 20, and the material can be easily carried in.

At a caisson installation site such as a breakwater, a caisson can be manufactured at a position connected to the existing caisson 21 as shown in FIG.
Towing is not required, and the existing caisson can be used as a material loading route when the breakwater is connected to land.

[0028]

As described above, in the method and apparatus for manufacturing a concrete caisson according to the present invention, a caisson forming form is installed on a water surface while being supported by a floating body floating on the water surface. At the same time as casting a caisson of a predetermined height by casting concrete in the frame, a caisson supporting suspension is fixed to the caisson, and a caisson formed by supporting the caisson supporting suspension on the floating body is formed. Hanging, waiting for the concrete to solidify, pulling out the caisson support hanging material and lowering the caisson into water so that the formwork is relatively moved above the caisson so that the next concrete is successively inherited When the caisson was completed, the caisson was supported by a floating body and hung underwater. Because it is, it is possible to caisson manufactured at lower cost than before.

In addition, it becomes easy to manufacture a caisson having no bottom plate, and it is easy to form the bottom plate integrally with the substructure when installing the caisson on the water bottom, so that a caisson that can be easily installed with high stability can be manufactured. .

Furthermore, a plurality of hanging beams are installed above the water surface with both ends supported by a floating body, and the caisson supporting hanging material and the caisson forming form are supported by the beams, so that the form can be compared with the water surface. It is always located at a fixed height at a relatively low position, so that work at high places is eliminated and workability is improved.

Further, the floating body has a U-shaped flat surface and is provided with a caisson hanging space open on one side, and the caisson is hung in the space and lowered sequentially,
Caisson installation work that is higher than the sea level will be possible.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of a concrete caisson floating apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 shows an initial assembly of a formwork device in a concrete caisson surface manufacturing method using the device shown in FIG.
It is sectional drawing which shows a stage concrete pouring state.

FIG. 4 is a cross-sectional view showing a lowered state of the first-stage caisson according to the first embodiment.

FIG. 5 is a sectional view showing a state when the completed caisson is towed.

FIG. 6 is a cross-sectional view of an example of the caisson installed state in the same.

FIG. 7 is a plan view showing production and towing in a state of berthing on a quay.

FIG. 8 is a plan view showing a production state at a bank body installation site.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS A Caisson 1 Floating body 2 Caisson hanging space 3 Stand-up part 4 Prop 5 Caisson forming formwork device 6 Outer formwork 7 Inner formwork 8 Formwork holding mechanism 9 Hanging material 10 Suspension means 11 Concrete casting section 12 Bottom formwork 13 Concrete 14 Foundation 15 Basement 20 Quay 21 Existing caisson

Claims (5)

[Claims] 1. A caisson forming formwork is installed on a water surface while being supported by a floating body floating on the water surface, and concrete is poured into the formwork to form a caisson of a predetermined height. The caisson supporting hanging material is fixed to the caisson, the caisson manufactured by supporting the caisson supporting hanging material on the floating body is suspended, and the caisson supporting hanging material is extended after the concrete is solidified. A method for manufacturing a concrete caisson on water, comprising: moving the form relative to the upper part of the caisson by lowering the caisson into water; 2. The concrete caisson according to claim 1, wherein a plurality of hanging beams are installed above the water surface with both ends supported by a floating body, and the caisson supporting hanging material and the caisson forming form are supported by the beams. Water production method. 3. The concrete according to claim 1, wherein the floating body has a U-shaped flat surface, and has a caisson hanging space with one side open, and the caisson is hung in the space to descend sequentially. Caisson water production method. 4. A floating body floated on the water surface, a suspending means supported by the floating body, a caisson molding form supported by the suspending means, and a caisson formed sequentially in the form. A concrete caisson water making apparatus, comprising: a suspending member for suspending the suspending member with respect to the suspending means; and a suspending means for extending the suspending member in a caisson descending direction. 5. A floating body having a U-shaped flat surface and a caisson hanging space having an open side, and a caisson molding form and a caisson supporting hanging material are supported above the hanging space. 5. The concrete caisson surfacing apparatus according to claim 4, wherein a plurality of beams are laid horizontally.