JPH0128168B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for providing a section at the joint of a marine structure (floating box) in which a plurality of concrete floating box blocks are joined together.

Conventionally, when manufacturing concrete marine structures (floating boxes) that are floating on the sea, etc., two prefabricated concrete floating boxes are used, as shown in the side cross-sectional view of Figure 1. Block 1A, 1B
is floated on the water surface W, towed to a predetermined position, and positioned so that the mating members 3 of the joints 2 provided on each of the floating box blocks 1A and 1B correspond to each other. sheath hole 4,
Pass the PC steel wires 6 through the ropes 5 and bring their tips out to the water surface W through the sheath holes 4 and 5. Pass the ropes 7 through the sheath holes 4 and 5 of the other floating box block 1B, and let their tips come out to the water surface W. I'll put it out there.

Therefore, the PC steel wire 6 from the sheath holes 4, 5 of each floating box block 1A, 1B was tied to the rope 7 as shown in Fig. 2, and the other end of the rope 7 was pulled from inside the floating box block 1B. , the PC steel wire 6 is pulled together, and both ends of the PC steel wire 6 are connected to jacks 8 provided inside each of the floating box blocks 1A and 1B, as shown in FIG. 3, and pulled together.

As the corresponding joints 2 of the floating box blocks 1A and 1B approach each other, the convex and concave cone-shaped facing members 3 of each joint 2 come into contact with each other and move along the cone-shaped slope. By further tensioning the PC steel wire 6, the facing member 3 becomes a pressure-bearing surface and is temporarily fixed as shown in FIG. 4, and at the same time, the water supply member 9 Water is cut off in the enclosed section 10.

Next, the seawater in the upper section 10 is drained, and the fifth
As shown in the plan sectional view of the figure, mortar 11 or adhesive is injected into the compartment 10, and the mortar 1
After the hardening of step 1, the PC steel wire 6 is passed through the remaining sheath holes (not shown) and is tensioned to a predetermined tension to fix it.

However, in the marine structures (floating boxes) manufactured as described above, there is a problem in that if water leaks occur at the joints 2 of the floating box blocks 1A and 1B, it is difficult to repair it, especially when the water leakage occurs immediately after construction. If the water is incomplete, watertight repairs are difficult.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and it facilitates repair and inspection of the joints of concrete marine structures (floating boxes) and improves the reliability of the joints. It is intended for measurement.

That is, the method of providing a section at the joint of a concrete marine structure (floating box) of the present invention is suitable for constructing a marine structure (floating box) consisting of a plurality of concrete floating box blocks connected to each other at the joint. In the joint part, a joint space is provided by providing a partition wall at the end of each floating box block, and
A manhole or the like is provided to enable access to the joint space from inside the floating box block, and a plurality of sheath holes are drilled in the joint end surface of each floating box block, and a plurality of sheath holes are provided inside the floating box block. With the water level gauge,
Concrete characterized by detecting a drop in the water level in the joint space, and inserting a PC steel wire into the opposing sheath holes in order from top to bottom to create tension as the water level drops. It is characterized by a joining method for manufactured marine structures.

Embodiments of the marine structure (floating box) of the present invention will be described below with reference to the drawings. FIG. It is.

First, this offshore structure (floating box) consists of two prefabricated concrete floating box blocks 1A and 1B that are connected to each other at a joint 2, and the above-mentioned floating box is attached to this joint 2. Block 1A, 1
A joint section 16 is formed from the end partition walls 12A, 12B of each of the floating box blocks 1A, 1B. They are provided on the partition walls 12A and 12B, respectively.

Next, in manufacturing the concrete offshore structure (floating box) of the present invention having the above-mentioned configuration, the floating box blocks 1A and 1B will be joined, and the side view and As shown in the perspective view of main parts in FIG. 8, a chain block 14 for pulling the blocks is attached to the chain block fixing jig 13 provided on the upper part of the floating box blocks 1A and 1B, and the two are gradually pulled together.

In this case, in order to avoid sudden collision between the joints 2 of the floating box blocks 1A and 1B, it is preferable to attach a cushioning material such as an old tire 15 in advance.

In addition, a matching member 3 as shown in Fig. 6 is provided on each corresponding surface of the joint part 2, and after the matching of the joint parts is completed, a PC steel wire 6 is inserted into the sheath hole 4 on the water line of the side wall. This is then tensioned by a jack 8 similar to that shown in the conventional example shown in FIG. At this time, the joint surface of each joint part 2 is coated with an adhesive such as epoxy resin, thereby maintaining water-stopping properties.

At the same time as joining, the floating box block 1 shown in Fig.
The end bulkhead 1 is pumped by a pump 17 installed in A.
The seawater in the joint section 16 formed by 2A and 12B is discharged.

In this case, while watching the water level gauge 18 installed in the floating box block 1A, insert the PC steel wire 6 into the sheath hole 4 from top to bottom one by one as the water level in the joint section 16 decreases and tighten it. However, the sheath hole 4 located below the water surface has a lid to prevent seawater from entering, and as mentioned above, when the water level drops and the sheath hole 4 comes out above the water surface, remove the lid and close the sheath hole. 4. Drain the seawater that has accumulated inside the tank and clean the sheath.
The PC steel wire 6 is inserted.

Therefore, as shown in the side view of FIG. 9 and the plan view of FIG. A worker enters the joint section 16 through the provided manhole 19 and applies a water-stop sealant to the adhesive part of the joint 2.

In addition, the manhole 19 is connected to each floating box block 1A,
It may be provided at either one of the end partition walls 12A or 12B of 1B, and it is always covered with a lid or the like, and the cover can be removed to allow workers to pass through when inspecting and repairing the joint section 16. You can keep it.

Therefore, in the concrete offshore structure (floating box) of the present invention, a joint section is provided at the joint section, and workers can enter and exit from the floating box block into the joint section. The watertightness of the joint can be inspected over a long period of time, and even if water leaks from the joint, it can be easily repaired.

In particular, even if water sealing is incomplete immediately after construction, it is possible to repair the water tightness, and the present invention is extremely effective in improving the reliability of the joints of concrete offshore structures (floating boxes). It is.

[Brief explanation of drawings]

Figures 1, 2, 3, and 4 are a series of side sectional views of main parts explaining the joint state of conventional concrete marine structures (floating boxes), and Figure 5 is the same as in Figure 4. A plan sectional view of the main part showing the completed state with mortar injected into the compartment formed at the joint part, and Fig. 6 is a side cross-sectional view of the main part of the joint part of a concrete offshore structure (floating box) in an embodiment of the present invention. Figure 7 is a side view showing the joint state of the floating box block in Figure 6, Figure 8 is a perspective view of the main part of Figure 7, and Figure 9 is the concrete offshore structure (floating structure in Figure 6). FIG. 10 is a plan view of FIG. 9 after completion of the box. 1A, 1B...Floating box block, 2...Joint part, 12
A, 12B...End partition wall, 16...Joint space, 19
…manhole.

Claims (1)

[Claims] 1. In a marine structure consisting of a plurality of concrete floating box blocks connected to each other at a joint part, a joint space is provided by providing an end partition of each floating box block at the joint part, and A manhole or the like is provided to enable access from inside the floating box block to the joint space, and further,
A plurality of sheath holes are drilled in the joint end surface of each floating box block, and a water level gauge installed inside the floating box block detects a drop in the water level in the joint space, and according to this drop in water level. A method for joining concrete marine structures, characterized by inserting PC steel wires into sheath holes that face each other from top to bottom in order and applying tension to the wires.