JPH0941390A - Method of caisson manufacturing construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a caisson efficiently on the sea even when a manufacturing yard on land, the mooring quay of a floating deck, etc., are not obtained near a caisson installation design spot. SOLUTION: A pair of caissons sunk on a foundation 2 on the bottom 1 of water under a temporarily placed state are used as supporters 10, and a platform 30 being bore to both supporters 10 and capable of being horizontally lifted and lowered by hung lifting-lowering driving devices 20 is provided. Caissons 100 are constructed successively on the platform 30 from lower sections, and the platform 30 is lowered in response to the increase of the bulkiness of the caissons and the caissons are built in succession while being gradually sunk into water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson manufacturing method for constructing a concrete caisson used for a bay facility, a foundation of a bridge pier, or the like.

[0002]

2. Description of the Related Art Conventionally, the construction of concrete caisson is
This is done using a caisson yard built on land facing the sea and a floating dock moored to the quay.

In the caisson production yard, the caisson after construction is moved onto the platform by using a method for launching the constructed caisson using a slope leading to the sea or using a launching platform that descends below the surface of the water. After letting
The method of lowering the platform below the surface of the water to launch it is adopted.

When a floating dock is used, it is moored to an existing quay, a caisson is constructed on the dock in a floating state, and after the construction is completed, the floating dock is sunk to launch the caisson. I am trying to let you.

[0005]

In the conventional manufacturing yard and the caisson manufacturing in the floating dock described above, the land where the manufacturing yard can be constructed and the floating dock can be moored in the vicinity of the installation point of the caisson. Quay is required.

Therefore, when such a place cannot be secured, for example, in the case of construction on a remote island or expansion of a power plant port, it is necessary to manufacture caisson in a remote place and tow a long distance to the installation point. However, there was a safety problem in the process.

The present invention has been made in view of such conventional problems.
The purpose is to provide a caisson manufacturing method that allows caisson production near the installation site, even if it is difficult to construct a caisson production yard near the caisson installation site or mooring to the dock of the floating dock. It is a thing.

[0008]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are as follows.
On the ocean, using a platform for caisson production supported by a support of a fixed structure capable of moving up and down above and below the surface of the water, concrete caissons are successively built on the platform above the bottom, The platform is lowered below the surface of the water according to the increase in bulk.

It is preferable to use a temporarily placed caisson set on the seabed in a temporarily placed state as a support for the fixed structure. Further, a caisson manufacturing platform is installed in a plurality of suspension types with respect to the support. It is preferable to support it so that it can be moved up and down via a lifting drive device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings.

In the figure, 10 and 10 are fixed-structure supports installed in or near a closed bay such as a cove. Each of the supports 10 and 10 is composed of a caisson submerged on a foundation 3 or 3 formed on the bottom 1 of the water, and their upper ends are temporarily placed so as to project from the water surface 2 by a predetermined height. ing.

The two supports 10, 10 are installed at regular intervals, and work floors 12, 12 are provided so as to project to the upper portions on the opposite sides.

On the work floors 12 and 12 of both the supports 10 and 10, suspension-type lifting drive devices 20, 20 ... These elevating and lowering drive devices 20, 20, ... Are adapted to drive the hoisting means in synchronization with each other by an automatic control device, and the hanging wire members 23, 23 .. It has become so.

A platform 30 for manufacturing a caisson is installed between the two supports 10 to suspend and elevate the driving device 20, 20.
It is installed in a state of being hung horizontally at the lower ends of the hanging wire rods 23, 23. That is, platform 3
0 is supported by the suspension elevating / lowering drive device 20, 20 ... so that it can be elevated and lowered between the two supports 10, 10 while maintaining a horizontal state, and it is possible to freely dive and levitate. There is.

Further, fixed legs 48, 48 ... Are erected on both the supports 10 and 10, respectively.
A girder 47 for a shuttle crane is installed between 8 and 48. The shuttle crane 40 is supported below the girder 47 so that it can travel freely. The girder 47 can be extended to the land side for supplying materials and the like.

When manufacturing the caisson 100, first,
As shown in FIG. 2, the platform 30 is raised to the highest position on the surface of the water, the formwork is assembled on the platform 30, and concrete is poured into the first frame.
The casting lot portion 101 (bottom portion) is manufactured. Then the first
After the casting lot portion 101 is solidified and cured, a mold is assembled on the casting lot portion 101 and concrete is cast thereon to produce the second casting lot portion 102. Then, after solidification and curing of the second casting lot portion 102, the second casting lot portion 102
The platform 30 is lowered by the same height as.

Further, on the second casting lot portion 102,
The third form casting lot portion 103 is manufactured by assembling the formwork and placing concrete. Then, when the curing of the third casting lot portion 103 is completed, the height of the platform 30 is equal to the height of the manufactured third casting lot portion 103.
To lower. As a result, the platform 30 and the first and second casting lot portions 10 of the caisson 100 being manufactured are
1,102 settles below the surface of the water. Similarly, after manufacturing the fourth casting lot portion 104 on the third casting lot portion 103 and then sinking it, the third casting lot portion 103 is submerged in water, and as shown in FIG. A fifth casting lot portion 105 (uppermost portion) is manufactured on the placement lot portion 104.

As described above, while the caisson 100 is being manufactured, the platform 30 is lowered, and the casting lot parts 101, 102, ..., Which have been cured, are successively submerged in water, and buoyancy acts on the parts. Pendant lifting drive 2
Since the load of 0, 20 ... Is reduced, it is possible to manufacture a large caisson as compared with the driving force of the suspension elevating / lowering drive device 20, 20.

Further, each casting lot portion 102 being manufactured,
103 ... is always kept at a constant height, so support 1
Work can be suitably performed using the work floors 12 and 12 fixed to 0 and 10. Also, shuttle caisson 4
0 can be used to suitably convey materials, and a large tower crane or the like becomes unnecessary. In addition, the support 10,
It is also possible to use the top 10 as a material storage area, and therefore, a support barge or the like becomes unnecessary.

In the above-mentioned embodiment, the support is constructed on the ocean by using the temporary caisson.
The support may be constructed by a permanent structure, and the caisson to be manufactured may be a method of forming a formwork and sequentially placing concrete, or a method of sequentially connecting boxes manufactured at different places. .

[0021]

As described above, according to the caisson manufacturing method of the present invention, the caisson is manufactured on the caisson manufacturing platform supported by the support body of the fixed structure provided on the sea so as to be able to move up and down. Even if the land to be constructed or the quay for mooring the floating dock cannot be secured, caisson can be manufactured and launched in the vicinity of the caisson installation point, and the construction cost can be reduced especially when a large number of caisons are manufactured. be able to.

When constructing a caisson on a caisson manufacturing platform, the caisson is manufactured step by step from the lower part to the upper part, and the platform is lowered to sink the part where the caisson is manufactured into water. As a result, buoyancy acts on that portion, and the load on the suspension elevating and lowering drive device is reduced, and a caisson larger than the driving force of the suspension elevating and lowering drive device can be manufactured.

The caisson is manufactured step by step from the lower part to the upper part, and the platform is lowered to keep the part of the caisson to be manufactured at a constant height. A shuttle crane that moves along the girder installed between the bodies can be used, eliminating the need for a large tower crane.

Furthermore, by using a caisson temporarily placed on the bottom of the water as a support of a fixed structure for supporting the caisson manufacturing platform, it can be re-floated, moved to another place, and reused. Moreover, since the upper surface of the support body using the caisson can be used as a material storage area, there is an advantage that a hinterland or a supporting barge is unnecessary.

[Brief description of drawings]

FIG. 1 is an elevational view showing an example of an embodiment of a caisson manufacturing method according to the present invention, showing a completed state of a caisson.

FIG. 2 is an elevation view showing a manufacturing state of a first casting lot portion (bottom portion) of a caisson.

FIG. 3 is an elevation view showing a manufacturing state of a fifth casting lot portion (uppermost portion) of a caisson.

[Explanation of symbols]

 1 Water Bottom 2 Water Surface 3 Foundation 10 Support 12 Working Floor 20 Suspending Lifting Drive Device 23 Suspending Wire Rod 30 Platform 40 Shuttle Crane 47 Girder 48 Fixed Leg 100 Caisson 101 First Casting Lot Part 102 Second Casting Lot Part 103 No. 3rd placement lot part 104 4th placement lot part 105 5th placement lot part

Claims (3)

[Claims] 1. A caisson manufacturing platform, which is supported on a support body of a fixed structure that can be lifted above and below the surface of water on the ocean, and concrete caissons are successively built up from the bottom on the platform. Then, the caisson manufacturing method is characterized in that the platform is lowered below the water surface in accordance with the increase in the bulkiness of the caisson. 2. The caisson manufacturing method according to claim 1, wherein a temporarily-placed caisson set by being settled in a temporarily-placed state on the seabed is used as the support of the fixed structure. 3. The caisson manufacturing method according to claim 1, wherein the caisson manufacturing platform is supported so as to be capable of moving up and down with respect to a support body through a large number of hanging type lifting drive devices.