JPH05331860A - Installation method for caisson using work barge - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a caisson installation method by a work boat that can easily and reliably install the caisson even in high waves. [Structure] A hoist for hoisting a caisson, which consists of a catamaran, is fixed in place, and at least a part of the new caisson is drawn between the catamarans of this hoist, and water is poured into the new caisson so that there is approximately a margin of water depth. At the position of 1 m, this is suspended by the hoist ship, and in that state, the water ballast is poured into the new caisson after being water-filled, and then seated by the water ballast. The hoist ship is fixed by seating the hoist ship on the existing caisson.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson installation method using a work boat.

[0002]

2. Description of the Related Art For installation of caisson on the sea,
Conventionally, there are the following methods.

1) A method of installing a caisson by directly installing a winch or other installation equipment on the caisson.

2) A method of installing a caisson using a barge equipped with installation equipment.

3) A method of installing a caisson by a hoist ship.

In both of the above methods 1) and 2), there is a possibility that the left / right shaking becomes large just before the bottom of the caisson, but there is a large possibility that a sufficient response cannot be taken. If the construction method is selected from the above, the method using the hoist ship of 3) is relatively suitable.

In the method using a hoist ship, after the caisson is held at a predetermined position by a maneuvering winch of the hoist ship and a predetermined bottom clearance is secured, water is injected into the caisson with ballast necessary for stability after landing. By lowering the crane, the caisson bottoms.By doing so, it is possible to minimize the effects of lateral swaying and back-and-forth swing that increase due to a reduction in bottom clearance. Can be prevented from moving.

[0008]

However, the conventional hoist ship system has the following problems.

1) The hoist ship is also a floating body, and it is difficult to control the floating body with the floating body.

2) It takes a long time to anchor and rope the hoist ship.

3) There is a lot of manual work on the sea, which is dangerous.

4) The weather resistance of the anchored ship is dominated by the weather resistance, and therefore the weather resistance is maintained.

The present invention is intended to eliminate the above drawbacks.

[0014]

A method for installing a caisson by a work boat according to the present invention comprises a step of positioning a hoist ship for installing a caisson, which comprises a catamaran, and at least a part of the new caisson, which is a catamaran of the hoist ship. The process of drawing in between, the process of pouring water into this new caisson to make the surplus water level about 1 m, and suspending this new caisson in that state by the hoist ship, and the water ballast necessary for the bottom to land in the new caisson. And a step of operating the hoist ship to lower the new caisson and set it to the bottom.

In the method of installing a caisson by a work boat according to the present invention, the step of positioning the hoist ship includes the steps of drawing an existing caisson between the catamaran ships, and pouring water into the hoist ship to place it on the existing caisson. It is characterized by comprising a step of seating.

[0016]

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

In the present invention, as shown in FIG. 1, a caisson installation hoist ship 1 consisting of a catamaran is towed to the side of an existing caisson 2 and, as shown in FIGS.
Is drawn between the catamaran ships, and water is poured into the hoist ship 1 as shown in FIG. 4 to be seated on the existing caisson 2.

Next, as shown in FIG. 5, the new caisson 3 is towed to the side of the hoist ship 1, and as shown in FIG. 6, at least a part of the new caisson is pulled into the catamaran on the bow side of the hoist ship 1, as shown in FIG. As shown in Fig.8, the lifting wire 4 is attached to the new caisson 3, water is poured into the new caisson 3 until the surplus water depth becomes about 1 m as shown in Fig.8, and then the lifting wire is lifted by the crane 5 located at the bow of the hoist ship 1. Water is charged into the newly installed caisson 3 with the water ballast required for the bottom of the ground while maintaining a tension of 4 and a water depth of 1 m.

At this time, preferably, the ballast on the bow side in the hoist ship 1 is drained to reduce the weight applied to the hoist ship 1,
Reduces the burden on the existing caisson 2.

Next, the hoisting ship 1 is operated to lower the new caisson 3 to the bottom as shown in FIG.

In addition, 6 is a tugboat, and 7 is formed on the inner surfaces of the bow and stern of the catamaran forming the hoisting ship 1 in order to make constant the reaction force applied to the hoisting ship 1 by the inclination of the new caisson 3. A constant reaction force type fender, 8 is a pneumatic fender provided on the bow side of a connecting portion 9 for connecting the upper portion of the catamaran to absorb a surge generated between the new caisson 3 and the hoist ship 1. By bleeding the air inside the caisson 3 just before the bottom of the caisson 3, the gap between the existing caisson 2 and the caisson 3 can be set to a desired value as shown in FIG.

In the above embodiment, the existing caisson 2 is used to fix the hoist ship 1. However, when there is no such existing caisson 2, the caisson installation hoist ship 1 is fixed to the predetermined position by anchoring. After that, the steps shown in FIGS. 5 to 9 are performed.

[0023]

Since the method of installing the caisson by the work boat of the present invention is as described above, the installation of the caisson can be carried out very easily and reliably in a short time even during high waves, and in particular, when water is poured. The caisson's lateral swaying and back-and-forth sway, which increase when the bottom clearance becomes smaller, is blocked by the catamaran that holds the caisson, and there is a great advantage that the position of the caisson does not greatly shift just before reaching the bottom.

[Brief description of drawings]

FIG. 1 is a plan view for explaining a method of the present invention.

FIG. 2 is a plan view for explaining the method of the present invention.

FIG. 3 is a front view for explaining the method of the present invention.

FIG. 4 is a front view for explaining the method of the present invention.

FIG. 5 is a plan view for explaining the method of the present invention.

FIG. 6 is a plan view for explaining the method of the present invention.

FIG. 7 is a side view for explaining the method of the present invention.

FIG. 8 is a side view for explaining the method of the present invention.

FIG. 9 is a side view for explaining the method of the present invention.

FIG. 10 is a plan view of a catamaran portion of a hoist ship used to carry out the method of the present invention.

FIG. 11 is a plan view of a hoist ship used to carry out the method of the present invention.

FIG. 12 is a rear view of a hoist ship used to carry out the method of the present invention.

FIG. 13 is a front view of a hoist ship used for carrying out the method of the present invention.

FIG. 14 is a side view of a hoist ship used to carry out the method of the present invention.

[Explanation of symbols]

 1 Hoist ship 2 Existing caisson 3 New caisson 4 Lifting wire 5 Crane 6 Tug boat 7 Constant reaction force type fender 8 Pneumatic fender 9 Connection part

Claims (2)

[Claims] 1. A step of positioning a hoist for hoisting a caisson, which comprises a catamaran, a step of drawing at least a part of the new caisson between catamarans of the hoist, and water pouring into the new caisson to allow a margin. The process of making the water depth about 1 m, the process of pouring water ballast necessary for the bottom into the new caisson while suspending this new caisson by the hoist ship, and operating the hoist ship A method of installing a caisson by a work boat, which comprises the step of lowering the caisson to set it to the bottom. 2. The step of positioning the hoist ship comprises the steps of pulling an existing caisson between the catamaran vessels and pouring water into the hoist ship and seating it on the existing caisson. The method for installing a caisson by a work boat according to claim 1.