JPS5843534B2 - Offshore joining method for concrete floating bodies - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an offshore joining method for concrete floating bodies,
Particularly when constructing large-scale offshore structures, concrete floating boxes that have been divided into an appropriate number of units are positioned on the ocean, and then PC steel is stretched between the floating boxes. First, the upper end of the floating box is pulled together and temporarily fixed using a wire or other steel wire, and then the lower end is pulled using the buoyancy of the counterweight to align the end face of the floating box in the correct position. After temporarily fixing, mortar is injected between the joint end faces to apply a constant tension to the PC steel wire, thereby firmly joining the floating boxes together.

Generally, offshore structures are constructed by dry work at a dock and then towed to a predetermined offshore location.

However, as the scale of structures increases, it becomes impossible to construct them using existing docks, and constructing new docks requires enormous construction costs. When a structure is towed from a dock to a predetermined position, the structure is subjected to a significantly large vertical bending moment during towing, so the design cross section must be made large, which is disadvantageous in terms of stress.

Therefore, if the structure is divided into an appropriate number of units in advance and the individual divided units are joined together at sea, the above problem can be solved, but when joining the floating boxes at sea, Because sea conditions such as wave pressure, wind pressure, and tidal currents are even more severe than those on the seabed, and due to differences in various conditions, it is not possible to directly apply conventional techniques for joining submerged containers underwater. Therefore, there is a need for the development of an offshore joining method that can overcome these harsh construction conditions and can be performed with high precision, high efficiency, and economically.

In particular, the construction of offshore airports, maritime cities, offshore nuclear power plants, offshore plant bases, etc. is predicted to occur in the near future, and there is a growing demand for the development of construction methods for constructing such large offshore structures economically and easily. There are some that are extremely expensive.

In response to such demands, this invention constructs large-scale offshore structures by connecting concrete floating boxes, which have been divided into an appropriate number of units in advance, to each other at sea using PC steel wires. The purpose of the present invention is to construct a floating body by a consistent continuous process, and the purpose of this invention is to construct a temporary structure until the floating body is pulled together and temporarily fixed. The purpose of this invention is to use P'C steel wire or other steel wires in the process by appropriately selecting them, and to utilize the buoyancy of the floating box itself. It is an object of the present invention to provide a joining method that can be constructed by dry work, and a further object of the invention is to provide a joining method that is easy to manage and is highly safe. The purpose of the present invention is to ensure that the scale of the structure is not restricted by the capacity of the dock, and a further object of the present invention is to provide a joining method that can be used regardless of the type, scale, shape, etc. of offshore structures. A further object of the invention is to provide an economical cross-sectional shape of a marine structure.

That is, in the present invention, as in the illustrated embodiment, the steel wire sheath holes 11, 14 are provided at the joint end faces 3, 4, which are provided with the ballast tank 14, 14 at one end and the facing members 5, 6 at the other end.
The concrete floating bodies 1 and 2 having openings 11a are floated to a predetermined ocean position by disposing a flexible member 13 on the joint end faces 3, so that the joint end faces 3 and 4 face each other. After positioning the floating box 1.2, a PC is inserted into the upper steel wire sheath hole 11a between the floating boxes 1 and 2 or on the deck.
The steel wire 12a or other steel wire is stretched and pulled together from both ends, and the joint end surfaces are matched with each other via the matching members 5 and 6 while being gradually tensioned,
The upper ends of the joining end surfaces 3 and 4 are then crimped together via the flexible crimping member 13, and then the ballast tank 14.
14, the lower ends of the joining end surfaces 3 and 4 are crimped via the flexible crimping member 13, and the floating box 1°2
is corrected to the normal position and temporarily fixed, after which the accumulated water between the joint end faces is discharged and mortar is injected between the end faces, and then the facing sheath holes 11 of the joint end faces 3 and 4 are fixed.
Insert the PC steel wire 12 into each of the PC steel wires 12 and 12.
The present invention relates to a method for joining concrete floating bodies at sea, which is characterized in that the floating boxes 1 and 2 are joined together by applying a constant tension to a.

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

The concrete floating body of the present invention is manufactured by dividing a predetermined marine structure into appropriate units at a dock or on land.

Figures 1 to 4 show the joint end faces of concrete IJ) floating boxes joined according to the present invention, and the joint end faces 3 and 4 of the concrete floating box 1. Surface matching members 5 and 6 are provided, respectively.

The mating member 5 of the joint end face 3 has a support portion 7 projecting near the center of the upper end of the end face 3, and the mating member 6 of the joint end face 4 has a shoe seat portion on which the bottom surface of the support portion 7 is placed. 8 is a protruding part.

The length of the support portion 7 in the lateral direction of the joint end surface is the length of the shoe seat portion 8
Jacks 9 and 10 are provided between both sides so that the support part 7 is housed in the shoe seat part 8.

As a result, the floating bodies 1 and 2 come close to each other, and the support part 7 is attached to the shoe seat part 8.
When the floating boxes 1 and 2 are placed, the upper surfaces of the floating boxes 1 and 2 are kept in a horizontal plane, and the deviation of the sides of the floating boxes 1 and 2 is corrected by
It should be adjusted with .

The bottom edge of the support portion 7 and the top surface of the shoe seat portion 8 are both tapered or curved and made of a reinforcing material with excellent wear resistance and corrosion resistance and a small coefficient of friction, such as Teflon. It is coated with synthetic resin, steel plate, synthetic rubber, etc.

In addition, a drain port and a mortar inlet are provided as appropriate on the joint end surface, and the other end is opened to the outer or inner surface of the floating body, and an air vent hole is provided (not shown).

Furthermore, a plurality of steel wire sheath holes 11.11a penetrate through the upper, lower and side plates of the floating boxes 1 and 2 at opposing positions, respectively.

The sheath hole 11a provided in the upper part is used for pulling the floating boxes together and temporarily fixing them by inserting the PC steel wire 12a, but it is also used as a means to pull the steel wire from both ends and further apply tension. For example, a jack (not shown) is installed inside the floating box.

For the other steel wire sheath holes 11, a removable stopper is provided on the inner surface of the hole, and a backing is provided around the end surface of the hole to prevent water from entering the floating box and between the end surfaces. This is to prevent the injection agent from seeping into the sheath hole during mortar injection (not shown).

Incidentally, a flexible crimping member 13 such as a rubber gasket is disposed around the joint end surface 3 and below the facing member 5.

This pressure bonding member 13 may be arranged in two layers around the periphery if necessary.

Furthermore, the other end of the floating boxes 1 and 2 is connected to the ballast tank 1.
4 and 14 are configured.

Figures 5 to 7 show other embodiments of the mating member provided on the joint end face, where Figures 5 and 7 are cone-shaped fitting guides, and Figure 6 is a hemispherical fitting guide. This is a mating guide.

A plurality of fitting guides 5 on the end surface 3 are formed in a convex shape, and fitting guides 6 on the end surface 4 are formed in a concave shape. When the end faces 3 and 4 are brought into contact with each other and fitted together, the end faces 3 and 4 are brought into contact with each other at regular positions.

Note that the surfaces of the fitting guides 5 and 6 are coated with a reinforcing material such as a steel plate, synthetic rubber, or synthetic resin.

Reference numeral 13 designates a flexible crimping member such as a rubber gasket disposed around the end surface 3.

The process of joining the floating box 1 and the floating box 2 will be explained with reference to FIGS. 8 to 11.

First, floating boxes 1 and 2 are floated on the sea and towed to a predetermined position.
Positioning is performed so that the joint end surfaces 3 and 4 of both are opposed to each other.

Next, the PC steel wires 12a are inserted into the sheath holes 11a and 11a (FIG. 3) provided in the upper version of the floating box among the opposing sheath holes on the end faces, respectively, and the wires are inserted between the floating boxes 1 and 2. The steel wire 12 is stretched by connecting both ends of the PC steel wire to jacks (not shown) provided inside the floating boxes 1 and 2.
Since the floating boxes 1 and 2 are brought in by hand from both ends, the floating boxes 1 and 2 are brought close to each other.

Alternatively, a similar operation can be performed using steel wires placed above the deck (Figure 8).

As the floating boxes 1 and 2 approach each other, the matching members 5 and 6 provided on the end faces 3.degree.

In the face-matching member shown in FIGS. 1 to 4, the support part 7 of the end face 3 is placed so as to slide into the shoe seat part 8 of the end face 4, and the upper surface of the floating body is kept in the normal position. The jacks 9 and 10 provided between the side surfaces of the shoe seat 7 and the shoe seat 8 are operated to adjust the side surfaces of the floating body to maintain their normal positions.

In the mating member shown in FIG. 5 or 6, a convex fitting guide 6 is provided at the upper part of the end faces 3 and 4, and in the mating member shown in FIG. The fitting guide 5 is inserted and the upper, lower, left, and right positions are maintained in the correct positions and the two sides are mated.

Therefore, when the tension of the steel wire 12a is further increased, the upper end of the rubber gasket 13 disposed on the end face is crimped, and the floating boxes 1 and 2 are temporarily fixed at the upper end of the end faces 3 and 4. Figure 9).

Next, water is appropriately poured into the ballast tanks 14, 14 provided at the other ends of the floating boxes 1, 2.

Due to the water injection, a moment due to the counterweight acts on the floating boxes 1 and 2 supported at the upper ends of the end faces 3 and 4, and the moment acts on the lower ends of the joint end faces 3 and 4 of the floating boxes. A buoyant force is generated, and the lower ends of the rubber gaskets 13 disposed on the end faces are crimped by the buoyant force and the water pressure acting on the floating boxes, and thus the floating boxes 1 and 2 are attached to the lower ends of the end faces 3 and 4. It is also temporarily fixed in (Figure 10)
.

Simultaneously with the above temporary fixing, the space surrounded by the rubber gasket 13 crimped between the end faces 3 and 4 is watertight.

With this, the temporary construction process from pulling the floating box to temporary fixing is completed.

Next, a rubber gasket 1 is placed between the end faces 3 and 4 of the floating boxes 1 and 2.
The accumulated water in the space surrounded by 3 is discharged from a drain port (not shown), and mortar is injected between the end faces from an injection hole (not shown).

In addition to cement mortar, various adhesives may be injected.

After the mortar has hardened, the PC steel wire 12 is inserted into the opposing sheath holes 11 of the end surfaces 3 and 4, and both ends of the wire are inserted into the floating boxes 1 and 2.
When the PC steel wire 12.12a is connected to a jack provided inside the PC steel wire 12, 12a and fixed by applying a certain tension to the jack, the floating boxes 1 and 2 are joined together with a predetermined strength (Fig. 11). .

As in the above embodiment, if the temporary construction process from pulling the floating box to temporary fixing is performed using a PC steel wire inserted into the floating box in advance, the temporarily fixed floating box can be finally integrated. It can also be used as is when joining to
It is extremely economical as it saves labor, construction time, materials, etc. compared to separate temporary construction work.

On the other hand, the temporary construction process can also be performed using steel wires (such as ordinary wires) other than PC steel wires.

In this case, the sheath hole through which the steel wire is inserted is provided in the upper part of the floating box separately from the sheath hole for the PC steel wire.

As described above, the present invention allows the offshore joining of concrete floating bodies to be consistently constructed in a continuous process.

Regardless of the construction scale or other conditions, it is possible to select either PC steel wire or other steel wire as appropriate for the temporary construction process from pulling the floating box to temporary fixing, and the buoyancy of the floating box itself can be used. Not only is it economical to construct all kinds of offshore structures, but all construction is done by dry work, so work management is easy and there is no danger.Furthermore, large-scale offshore structures can be built efficiently and inexpensively. There are advantages.

[Brief explanation of the drawing]

1 to 4 show an embodiment of a concrete floating box according to the present invention, FIG. 1 is a plan view thereof, FIG. 2 is a view taken along line A-A in FIG. Figures 3 and 4 are
Cross-sectional views taken along line B-B and line C-C in FIG. 1, respectively;
5 to 7 show other embodiments of the joint end surface of a floating box according to the present invention, and FIG. 5 a, FIG. 6 a, and FIG. 7 a are front views of the joint end surface, and FIG. , Figure 6b,
FIG. 7 is a side view of the floating boxes whose faces have been brought together, and FIGS. 8 to 11 are diagrams showing the process of joining the floating boxes according to the present invention. In the figure, 1 and 2 are concrete floating boxes, 3 and 4 are joint end surfaces, 5 and 6 are facing members, 11.11a is a steel wire sheath hole, 12 and 12a are PC steel wires, and 13 is a rubber gasket or stopper. It is a water component.

Claims (1)

[Claims] 1. A concrete floating box having a ballast tank at one end and a steel wire sheath hole opened at the joint end face provided with a facing member at the other end, and a flexible crimping member on the joint end face. After arranging and floating the floating box at a predetermined ocean position and positioning the floating box so that the joint end surfaces face each other, insert a PC into the upper steel wire sheath hole between the floating boxes or on the deck. A steel wire or other steel wire is stretched and pulled together from both ends, and the joint end surfaces are brought together through the mating member while being gradually tensioned, thereby making the upper end of the joining end surface flexible. The floating body is crimped through the crimping member, and then water is poured into the ballast tank to crimp the lower end of the joined end surface through the flexible crimping member, and the floating box is corrected to its normal position and temporarily installed. After fixing, the water accumulated between the joint end faces is drained and mortar is injected between the end faces, and then the PC steel wires are inserted into the opposing sheath holes of the joint end faces, respectively. A method for joining concrete floating boxes at sea, characterized by applying a constant tension to join the floating boxes together. 2. The offshore joining method for concrete floating bodies according to claim 1, wherein the flexible pressure bonding member is a rubber gasket.