JPH09228354A - Assembling method of marine workbench platform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide construction method of a marine workbench platform of comparatively light-weight and high strength, by which a labor for assembling operation can be reduced. SOLUTION: The hollow floater parts are prepared, and a pair of floaters of a predetermined length, are formed by connecting plural floater parts in the longitudinal direction. Then the pair of floaters 3 are floated on the sea in parallel, the legs 5 and the elevators 4 are installed on the both ends of the floater part, the pair of floater 3 are temporarily fixed by the temporary fastening members 6 of the predetermined length on the sea, to form a temporary platform 7, and the pair of floaters 3 are transported to building site. Then the legs 5 are lowered in the seawater by the elevators, so that they reach the bottom of the sea, the legs are further lowered, so that the temporary platform 7 is risen from the surface of the sea by the elevator 7, and the pair of floaters are fixed by a beam member to complete a platform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a marine work pontoon for assembling a marine work pontoon at sea.

[0002]

2. Description of the Related Art Work pontoons of this type are used, for example, for work in piles in the sea, and various types are known.
When assembling it, for example, by combining the floater part of a closed hexagonal hollow box to form a catamaran type pontoon, and equipping the four corners with lifting devices for sending the legs into the water, this pontoon floats above the water surface. In order to connect the hollow boxes that are being transported to the construction site, a male lock having a pin with an enlarged head or a female lock into which a male lock can be inserted is provided on the surface around the box. After connecting the female lock, a connecting bar is used to prevent the male lock from coming off. The work pontoon can be easily disassembled by removing the connecting bar after the construction work is completed. However, the conventional work pontoons are manufactured by combining a large number of hexahedron hollow boxes, which requires a dock at a shipyard, for example, and requires a great deal of labor for the assembling work. Because it is due to the lock and join bar,
In order to be strong in strength, the weight was also heavy, which required long sea transportation from the shipyard to the prescribed site.

[0003]

SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a method of assembling a marine work pontoon that allows parts to be transported by land to near the site and can be easily assembled at sea.

[0004]

According to the present invention, in a method of assembling a marine work pontoon for assembling a marine work pontoon at sea, a long hexahedral hollow floater portion is manufactured, and a plurality of those floater portions are manufactured. To produce a pair of floaters of a predetermined length by connecting them in the longitudinal direction, float the pair of floaters parallel to each other on the sea, and then temporarily fix the pair of floaters on the sea with a temporary fixing member of a predetermined length. Form a temporary stand,
Legs and lifting devices are installed on the floaters at both ends, and the lifting devices lower the legs into the seawater until they reach the seabed, and the legs are further lowered to raise the temporary platform from the sea surface, and the pair of floaters are attached to the girder member. Alternatively, it is fixed by a floater to complete the deck.

According to the present invention, when the temporary fixing member is installed at the end of the floater portion, the hole provided in the temporary fixing member and the pin provided at the end of the floater portion work together,
The hole of the temporary fixing member has a convex shape composed of a large diameter portion and a small diameter portion, and the diameter of the small diameter portion is formed to be substantially equal to the diameter of the pin.

Further, according to the present invention, the base plate is laid on the girder member of the temporary ship base, and the polystyrene foam is inserted between the girder members below the base plate.

Further, according to the present invention, when the pair of floaters are fixed by the girder member and the floaters arranged in parallel are displaced when the floaters are elevated, the displacement of the floaters after the elevation is adjusted.

Therefore, it is possible to make the float portion in advance to a size capable of being transported by land and make the floater on the coast near the site. Therefore, floaters can be made without the need for large-scale equipment such as docks.
It is possible to obtain a stable temporary ship base by making a pair of floaters made in this manner and floating them on the sea and temporarily fixing them to form a temporary ship base. Therefore, stable towing can be performed even if the legs and the lifting device are installed.

When a predetermined position for performing offshore work is reached, the leg is lowered by the elevating device to raise the temporary carrier from the sea surface. In this way, by positioning the lower part of the floater above the sea level, the girder member can be easily fixed with bolts and nuts.

As described above, according to the present invention, since the assembling work can be easily performed on the sea, the onshore equipment can be simplified and the onshore transportation can be facilitated, and the assembling process can be shortened. In addition, the reverse process of the above may be performed at the time of decomposition.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION First, a method for assembling a marine work carrier according to the present invention will be described with reference to FIGS.

First, the floater portion 1 made of a long hexahedral hollow closed box is manufactured. Since this floater portion is transported by land by truck, the maximum length that can be loaded on the bed of the truck is preferable.

Since the floater part 1 is sealed, it can float. A plurality of floater parts 1 are connected to each other in the longitudinal direction and assembled to the floater 3. The floater parts 1 at both ends of the floater 3 are provided with a base 2 to which an elevating device 4 is attached, and a work pontoon is fixed to a work site. It is provided with a hole H through which the leg 5 for feeding can be delivered.

Each floater part 1 has a connecting plate P, for example.
Are connected to each other with bolts and nuts.

As shown in FIG. 1, the pair of floaters 3 are
Floating on the surface of the water or the surface of the sea, a temporary fixing member 6 of a specified length
Then, the temporary stand 7 is manufactured by temporarily fixing. At that time, the braces 8 constituted by the turnbuckle T and the like are attached.
The braces 8 are for adjusting the distortion of the floater as described later.

As shown in FIG. 2, the elevators 4 are attached to the bases 2 at the four corners of the temporary ship base 7, and the legs 5 are inserted into the elevators 4 by using a crane, for example. The leg 5 is lowered using the lifting device 4 until it reaches the bed of water or the bed of the sea. When each leg 5 reaches the bedrock, the leg 5 is further lowered to push up the temporary base 7 to a predetermined height above the sea surface.

When the temporary ship base 7 is lifted to a predetermined height above the sea surface, as shown in FIG. 3, the pair of floaters 3 of the temporary ship base 7 are fixed by the girder members 9.

Any appropriate known technique can be used for this fixing mode. In the illustrated example, the attachment piece L is attached to the floater portion 1 in advance by welding or bolting, and the girder member 9 having a box-shaped cross section and an H shape is bolted using a connecting piece P similar to the connecting piece of the floater portion. do it. At that time, if the temporary base 7 is distorted, that is, relative displacement occurs, and if the girder member 9 cannot be mounted as it is, the turnbuckle T of the braces 8 is adjusted to adjust the girder member 9 to a predetermined interval. Good.

After the offshore work berth S is assembled in this manner, the temporary fastening members 6 and the braces 8 are removed to complete the offshore work berth S.

When disassembling the offshore work barge S, the steps reverse to the above may be used.

FIG. 4 shows a preferred embodiment of the present invention, and is an example in which a styrofoam block (not shown) is inserted between the beam members 9 shown in FIG. By doing so, the buoyancy can be increased.

Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, the temporary fixing member 6a is particularly easily fixed to a floater floating on the sea.

First, the manner of connection of the floater portion 1 will be described with reference to FIG. Each floater portion 1 is sealed by a partition wall 19 and has a flange portion 1b at its edge. On the other hand, the connecting plate 12 has bolts 13 at its flange portion 1b.
Are fixed to each other.

Further, projecting portions 1c are provided at the upper and lower ends of the floater portions 1 at both ends shown in FIGS. 7 and 8, and bolts 17 with which a nut N is screwed extend from the projecting portions 1c. Holes 20 are formed on both sides of the protruding portion 17. As shown in FIG. 9, the temporary fixing member 6a is formed by connecting a pair of contact plates 14 on both sides with a pair of upper and lower chevrons 15 and reinforcing them with a reinforcing member 16. A hole 18 having a small diameter portion 18a and a large diameter portion 18b is formed in the contact plate 14 at a position corresponding to the protruding portion 1c. And holes 21 are provided on both sides thereof.

Therefore, when attaching the temporary fixing member 6a,
As shown in FIG. 10, with respect to the floater 3 installed and floating on the sea, the large diameter portion 18b is first guided by the bolt 17 as a guide.
Is inserted into the protrusion 1c and moved downward to engage the small diameter portion 18a and the protrusion 1c, and the nut N may be tightened to the bolt 17. It should be noted that the holes 20 and 21 can be tightly fixed by bolting them.

Therefore, when such a temporary fixing member is used, the assembling work becomes easier.

[0027]

According to the assembling method of the present invention, a floater portion is manufactured in a factory, a required number of floater portions are connected to each other to form a pair of floaters, which are lowered to the sea surface and temporarily fixed, and then transported to a construction site and fixed. However, since the work is performed by raising it from the water surface or the sea surface, it is not necessary to join a large number of floater parts as in the conventional case, the work from below is easy, and the labor of manufacturing is small, In addition, the mechanical strength of the platform is large, the weight is relatively small relative to the effective area, and it is easy and easy to transport it to the work site after lowering it to the sea surface. Further, the temporary fixing member can be attached easily by using the holes having the small diameter portion and the large diameter portion. If styrofoam is inserted under the base plate, buoyancy can be generated. If braces are provided, the position of the floater can be adjusted more accurately.

[Brief description of drawings]

FIG. 1 is a perspective view showing a place where a pair of floaters are temporarily fixed according to the present invention.

FIG. 2 is a perspective view showing a place where a lifting device and legs are attached.

FIG. 3 is a perspective view showing a place where a pair of floaters are connected by a girder member and a temporary fixing member is removed.

FIG. 4 is a block of styrofoam provided between the girder members,
A perspective view showing a place closed with a base plate

FIG. 5 is a plan view showing a position temporarily fixed by another temporary fixing member according to the present invention.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a view in the direction of arrow B in FIG.

FIG. 8 is a view in the direction of arrow C in FIG.

FIG. 9 is a side view showing another temporary fixing member.

FIG. 10 is a side view showing a mode in which the temporary fixing member of FIG. 9 is attached to the floater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Floater part 1a ... Partition wall 1b ... Flange part 1c ... Projection part 2 ... Base 3 ... Floater 4 ... Elevating device 5 ... Legs 6, 6a ... Temporary fastening member 7 ... Temporary platform 8 ... Brace 9 ... Girder member 10 ... Base plate 12 ... Connection plate 13 ... Bolt 14 ... Contact plate 15 ... Angle bar 16 ... Reinforcing material 18 ... Convex hole 18a ... Small diameter part 18b ... Large diameter part

Claims (4)

[Claims] 1. A method of assembling a marine work pontoon for assembling a marine work pontoon at sea, wherein a hollow hexahedron floater portion is manufactured, and the plurality of floater portions are connected in a longitudinal direction to a predetermined length. A pair of floaters of which the floats are floated parallel to each other on the sea, and the pair of floaters are temporarily fixed on the sea by a temporary fixing member of a predetermined length to form a temporary ship base, and then the floater portions at both ends are formed. A leg and an elevating device are installed in the ship, and the elevating device lowers the leg into seawater until it reaches the seabed, further lowers the leg and raises the temporary ship base from the sea surface, and fixes the pair of floaters with girder members or floaters. A method for assembling a marine work pontoon, characterized by completing the berth. 2. When the temporary fixing member is installed at the end of the floater portion, a hole provided in the temporary fixing member and a pin provided at the end of the floater portion work together so that the hole of the temporary fixing member is large. 2. The method for assembling a marine work carrier according to claim 1, wherein a convex portion is formed by a diameter portion and a small diameter portion, and the diameter of the small diameter portion is formed to be substantially equal to the diameter of the pin. 3. The method for assembling a marine work carrier according to claim 1, wherein a bed plate is laid on the girder member of the temporary ship base, and Styrofoam is inserted between the girder members below the bed plate. 4. The assembly of a marine work carrier according to claim 1, wherein when a pair of floaters are fixed by girder members and the floaters arranged in parallel are displaced when the floaters are raised, the displacement of the floaters is adjusted after the rise. Method.