JPH05311668A - Launching method for large caisson - Google Patents

Abstract

PURPOSE:To provide the economical launching method of a large caisson excellent in the safety and reliability of the caisson launching work. CONSTITUTION:A submersible barge 2 having a ballast chamber 21 provided with a pumping/draining facility is used, the submerged pontoon 2 comes alongside the pier, the water in the ballast chamber 21 is drained, and the submerged pontoon 2 is moored with an anchor 3 installed on the water bottom below the submerged pontoon 2 in advance. The traction section 31 of the anchor 3 is hoisted with a jack 22 to sink the submerged pontoon 2, and a large caisson 1 or a large floating body structure manufactured on the land is moved onto the submerged pontoon 2. The submerged pontoon 2 is sunk after the large caisson 1 or the large floating body structure is mounted, then the large caisson 1 or the large floating body structure is floated, and the large caisson 1 is launched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for launching a large caisson used as a port structure.

[0002]

2. Description of the Related Art A caisson is a box-shaped concrete precast member that is often used in harbor structures. It is manufactured in a dry state, launched, levitated, towed, installed at a predetermined position, and then filled with a lid. Concrete is installed to make a structure. As the caisson launching method, there are a slope type, a dock type, a sinking barge type, and the like.

<a> Shaft type Shaft type means that a caisson is constructed on a revetment line, a box stand is installed on the land side of the slope, caisson is manufactured on the stand, and the caisson is launched using the slope. Is.

<B> Dock type The dock type includes a dry dock type and a floating dock type. With the dry dock type, a dock is constructed by excavating a revetment line, a gate and a water injection / drainage facility are installed in the dock, the inside of the dock is drained, a caisson is manufactured, and the gate is opened
The caisson is launched by pouring water. The floating dock type is one in which a caisson is manufactured by using a floating dock for shipbuilding work, and after the manufacturing, the dock is settled and the caisson is launched.

<C> Settling barge use type The settling barge use type means that a caisson is manufactured on land, the sinking barge is docked on a revetment, and the caisson is moved to be mounted on the ship to sink the sinking barge. Let the caisson be launched.

[0006]

[Problems to be Solved by the Invention] The above-mentioned prior art has the following problems. <a> Slope method The slope method requires the construction of a slope on the revetment line, and the land for slope construction must be secured. Therefore, a large amount of equipment costs. In addition, since one work is rarely reused, the utility value is low if a large number of caisons are not needed for one work.

<B> Dock type In the dock type, it is necessary to construct a dock on the revetment line, and a dock construction site must be secured. Therefore, a large amount of equipment costs. In addition, since it is rarely reused after the completion of one construction, the utility value is low if a large number of caisons are not needed for one construction. The floating dock type is for making caisson with a floating dock on the sea, so construction cannot be performed when the sea conditions and weather conditions are bad. Moreover, although marine structures have tended to increase in size in recent years, there is no dock for manufacturing caisson forming these structures.

<C> Sinking carrier use type In the sinking carrier use type, it is difficult to mount a caisson manufactured on land on the sinking carrier. That is, when a heavy caisson is moved to the sinking berth, the sinking berth loses its balance, and it is difficult to move the sinking cradle horizontally and stably. For this reason, it is desired to develop a reliable mounting technique for mounting the caisson on a sinking barge.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its purpose is to be economical and
It is to provide a caisson launching method which is excellent in safety and reliability for launching caisson.

[0010]

SUMMARY OF THE INVENTION The present invention uses a sinking pontoon having a ballast chamber equipped with a pouring / draining facility, the sinking pontoon is berthed, and water in the ballast chamber is drained and then set in advance. Mooring the sinking pontoon with the anchor installed on the bottom of the ship, pulling up the tension part of the anchor by the jack installed on the sinking berth, and sinking the sinking berth,
After moving the large caisson and large floating structure that were manufactured on land to the sinking barge and loading the large caisson and large floating structure, etc., sink the sinking barge to remove the large caisson and large floating structure. It is a method of launching a large caisson that is raised.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. <B> Overall Configuration FIG. 1 shows a perspective view of the caisson according to the present invention. Figure 2
FIG. 4 is a side sectional view showing the launching process of the caisson of the present invention. According to the caisson launching method of the present invention, the sinking pontoon 2 is docked on the revetment 4, the sinking pontoon 2 that drains the water in the ballast chamber 21 is forcibly settled by the anchor 3, and buoyancy is applied to the sinking pontoon 2. The horizontal state is maintained by the buoyancy force when the caisson 1 is transferred, the caisson 1 is launched after the caisson 1 is mounted and the sinking carrier 2 is settled.

<B> Caisson The caisson 1 is a well-known concrete box, and includes a structure such as a submerged box. The caisson 1 is manufactured on a pedestal 11. The gantry 11 has a plurality of wheels and can move smoothly on the rails 12a and 12b.

<C> Sinking Ship The sinking ship 2 is a ship that can float and sink. A ballast chamber 21 equipped with a pouring / draining facility is provided inside the sinking barge 2. By operating the amount of water contained in the ballast chamber 21, it is possible to control the ups and downs of the submersible ship 2. A rail 12b similar to the rail 12a is laid on the deck 23 of the sinking barge 2. Further, a plurality of jacks 22 are installed on the deck 23 of the sinking pontoon 2. The jack 22 applies tension to the anchor 3 that is placed on the bottom of the water. A coupling portion 24 is provided on the deck of the sinking pontoon 2. The connecting portion 24 is a semi-ring-shaped protrusion, and is designed to prevent the sinking ship 2 from separating from the seawall 4 when the caisson 1 is moved onto the sinking ship 2.
It is for mooring with the pile 41 and the mooring wire 42 provided in the.

<D> Anchor The anchor 3 is a well-known anchor for the purpose of forcibly sinking the sinking table 2 and increasing the buoyancy of the sinking table 2. The sinking method of the sinking ship 2 with the anchor 3 is
The anchor trunk 32 is placed on the bottom of the water and the pulling part 31
Is pulled up by the jack 22 installed on the deck of the sinking pontoon 2 to sink the sinking pontoon 2.

[0015]

Next, the caisson launching process of the present invention will be described. <B> Installation of sinking barge An anchor trunk 32 is placed on the bottom of the water near the revetment 4. Next, the water in the ballast chamber 21 of the sunk ship 2 is drained, and the hull is levitated so that the deck 23 is higher than the revetment 4. The sinking pontoon 2 is berthed, and the pulling part 31 of the anchor 3 is attached to the jack 22. The pulling part 31 is pulled up by the jack 22 until the deck 23 of the sunk ship 2 and the revetment 4 have the same height. Therefore, as shown in FIG. 2, the sinking pontoon 2 sinks. Since the submerged carrier 2 is forcibly settled, the buoyancy on the hull increases. After the sinking ship 2 is settled to a predetermined position, the connecting portion 24 on the deck 23 and the pile 4 on the seawall 4
Mooring 1 and 1 with a mooring wire 42.

<B> Installation of caisson The gantry 11 on which the caisson 1 is mounted is moved toward the sinking berth 2. The caisson 1 is manufactured on a stand 11 in a manufacturing yard near the seawall 4. The gantry 11 is a rail 12a
Since it moves on the top, you can move smoothly. The gantry 11 is gradually moved onto the rails 12b of the sunk barge 2. Then, as shown in FIG. 3, the weight of the caisson 1 and the pedestal 11 is added to the revetment 4 side of the sunk ship 2. However, since a large buoyancy is exerted on the sinking barge 2, the hull can be kept horizontal. Further, at this time, a force is horizontally applied to the sinking pontoon 2 in the offshore direction, but since the connecting portion 24 and the pile 41 are moored by the mooring wire 42, the sinking pontoon 2 is not separated from the seawall 4. Absent. Therefore, the gantry 11 can be moved in a state in which the submerged pontoon 2 is stabilized.

<C> Caisson launching After moving the gantry 11 and the caisson 1 to the center of the sinking berth 2, the mooring wire 42 of the connecting portion 24 is removed. Water is poured into the ballast chamber 21 of the sinking pontoon 2 to sink the sinking pontoon 2 and raise the caisson 1. The towed caisson 1 is towed to the installation site.

[0018]

Since the present invention is as described above, the following effects can be obtained. <B> Forcibly sink the sinking barge with an anchor,
By increasing the buoyancy of the sinking barge in advance, when moving the caisson onto the sinking barge, it is possible to support the weight of the sinking barge by the above-mentioned buoyancy and keep the sinking barge horizontal. It can be done smoothly and safely.

<B> Construction of slopes and docks and land for construction of slopes and docks is not required, and the berthing ship can be towed to another launch site for reuse, so it is very economical to carry out caisson launching work. It can be carried out.

[Brief description of drawings]

FIG. 1 is a perspective view of the caisson of the present invention when mounted.

FIG. 2 is a sectional view showing a caisson launching process of the present invention.

FIG. 3 is a sectional view showing a caisson launching process of the present invention.

FIG. 4 is a sectional view showing a caisson launching process of the present invention.

Claims (1)

[Claims] 1. A sinking pontoon having a ballast chamber equipped with pouring / draining equipment is used, the sinking pontoon is docked, water in the ballast chamber is drained, and the sinker is installed beforehand on the bottom of the sinking boat. The sinking barge is moored with the anchors that have been set up, and the jack installed on the sinking barge pulls up the tension part of the anchor to sink the sinking barge, and the large caisson and large floating structures manufactured on land are settled on the sinking bar. A large caisson launching method in which the caisson and large floating structures are moved to the ship and after the large caisson and large floating structures have been installed, the sinking barge is settled to float the large caisson and large floating structures.