JPS5852872B2 - Floating box joining method at sea - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining floating bodies at sea, and in particular, for large concrete floating bodies, an air cushioning material is interposed between the joint surfaces of both floating bodies at the time of joining. a convex device that absorbs collision force and restrains the amount of oscillation, and that has a cylindrical portion and a conical portion continuing on the joint surface of the floating box;
A rotation device that is fitted to this is provided in combination as a fitting device,
It is possible to provide the functions of joint guidance, positional accuracy, and shear resistance.

In general, the construction of large floating concrete structures is limited by the scale of existing facilities such as shipyard docks and slipways, and it is extremely uneconomical to temporarily construct large construction facilities that match the scale. .

Furthermore, when a very large structure, for example, a structure extending several hundreds or thousands of meters in length, is to be built, towed, and installed in one piece, many more technical problems arise.

Therefore, when constructing these large floating concrete structures, it is necessary to divide them into shapes and sizes that can be built within the scale of the existing facility or the scale of temporary construction facilities considering economic efficiency, and then tow them out to sea. It turns out.

This invention is a construction method for economically constructing a large structure with a large in-plane area by towing one solid floating box built in sections to a predetermined location on the ocean and joining them together on the ocean. .

This invention is particularly intended to solve these problems in joining floating boxes.

An object of the present invention is to absorb collision force and restrain the amount of vibration by interposing a pneumatic cushioning material between the joint surfaces during joining. The purpose is to make the joining work easier and more complete by using the devices together.

That is, in this application, as in the illustrated embodiment, when joining floating boxes at sea, a pneumatic cushioning material 11 containing variable pressure air is placed between the joining surfaces 5 of both floating boxes 1 and 2. The floating boxes 1 and 2 are brought together while the air pressure inside the pneumatic buffer material 11 is reduced, and the opposing joint surfaces 5 are brought into close contact with each other gradually. A specified invention is a method for joining floating boxes at sea, which is characterized by joining both floating boxes 1゜2 together, and furthermore, when joining floating boxes at sea,
A pneumatic cushioning material 11 containing variable pressure air is interposed between the joint surfaces 5 of both floating boxes 1 and 2 so as to be sandwiched between the joint surfaces 5, and the air pressure in the pneumatic cushioning material 11 is reduced. At the same time, both the floating boxes 1 and 2 are brought together and gradually brought closer to each other while the opposing joint surfaces 5 are brought into contact with each other. a protrusion 9a having a shape in which 14 continues; Then, the recesses 9b constituting a pair of fitting devices 9 are fitted together, thereby guiding both joining surfaces 5 to a predetermined relative position and positioning them while joining both floating boxes 1 and 2. A method for joining floating bodies at sea, which is characterized by the following, is defined as a combined invention.

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

1 to 5, the floating boxes 1 and 2 are pulled to a predetermined position using a wire 3 and a traction device 4 such as a winch or jack. After making fine adjustments to the position, angle, spacing, etc. of the joining surfaces 5, the PC steel material 6 joining both floating boxes 1 and 2 is temporarily tensioned and temporarily fixed.

Thereafter, a special bonding material 8 is filled into the joining surface joint portion 7, and after it hardens, the PC steel material 6 is fully tensioned to integrate both floating boxes 1 and 2.

As shown in Figs. 2 to 4, the structure of the joint surface 5 has a guiding function to facilitate pulling of the floating box and face-to-face work, ensuring joint position accuracy, and the wave load during the joint work. A fitting device 9 having a special shape to resist the generated shearing force, and a water-stopping material 1 that also functions as a water-stopping function for the joint surfaces and as a formwork for the special bonding material 8 filled in the joint surface joints 7.
0. In addition, the PC steel material 6 that joins both floating boxes 1 and 2, the special bonding material 8 that is filled in the joining surface joint 7, and the collision between both floating boxes 1 and 2 when the floating boxes are pulled together and brought together. Prevention and both floating boxes 1,
2. 1L of pneumatic cushioning material that functions to restrain mutual oscillation.
It also includes a jack 12, etc., which functions as a fine adjustment of the position, inclination, spacing, etc. of the joint surface 5, and as a reaction force for the temporary tension force of the PC steel material 6 that joins both floating boxes 1 and 2. .

Next, the pneumatic cushioning material 11 of the above joint surface structure will be explained.

Generally, when joining floating boxes, an elastic material such as rubber is usually used as a cushioning material, but since these cushioning materials have an elastic reaction force until the end of the joining process, they push the joint surface apart. The force required to generate a reaction force in the direction and pull and join the floating bodies, that is, the tension force, becomes the dog.

In addition, this elastic reaction force makes it difficult to remove the cushioning material.
The cushioning material is buried for each joining operation, which is uneconomical.

In contrast, with pneumatic cushioning materials, the internal pressure (air pressure) of the pneumatic cushioning material is adjusted at each stage of the joining work either inside the floating box outside the joint surface space or outside the floating box such as on the deck. It is possible to maintain a strong buffering force (reaction force).

Also, at the end of the joining work, the internal pressure (air pressure) of the cushioning material
By reducing the value to zero, the force (tension force) required for joining can be a predetermined value, and the buffer material can be removed more easily and can be used for other purposes, which is economical.

As shown in Figures 6 to 10, the shape of the air cushioning material includes a spherical shape, a cylindrical shape, a donut shape, a mat shape, a truncated cone shape, etc., and the mounting position thereof may be either inside or outside of the joint cross section. , on the neutral axis of the cross section, or a position that is vertically and horizontally symmetrical with respect to the neutral axis.

The cylindrical shape may be used vertically or horizontally.

Moreover, the number of units used is the number necessary for absorption of collision energy between floating bodies and control of agitation, and one or more units are used.

The pneumatic shock absorbers listed in Figures 6 to 10 have different reaction force characteristics as shown by the P-6 curve depending on their shape, size, and internal pressure, so the floating body may not sway due to the joint surface shape or waves, etc. Adopt the optimal shape, size, and initial internal pressure for the characteristics and joining method.

Note that general reaction force characteristics due to each shape are shown in FIG. 11, and reaction force characteristics due to each internal pressure are shown in FIG. 12.

Furthermore, in order to improve the effect of restraining the mutual movement of the floating boxes due to the friction between the wall surface of the floating box and the cushioning material, the air cushioning material is covered with a net, as shown in Fig. 13 or 14. Alternatively, the surface that comes into contact with the box can be textured.

Next, of the joint surface structure, the fitting device 9 will be explained.

As shown in FIGS. 15 to 18, the fitting device 9 consists of a combination of a protrusion 9a and a recess 9b, and a conical portion 14 having a guiding function to facilitate the work of joining the floating boxes. ,
Following this, there is a cylindrical portion 15 that ensures joint position accuracy and functions as a shearing key.

The rotation 9b has an opposite shape into which the protrusion 9a can fit.

The installation location of this device is within the joint surface or on the deck or side of the floating box.

The features of this fitting device are (a)
Since the inlet of the turning member 9b is expanded in a conical shape, the convex tool 9a can be easily inserted even if the joining unit is shaken by waves.

This also means that the tapered portions can be forcibly slid by drawing the boxes together, without having to strictly adjust the stuttering and horizontality of the boxes to be joined.

(b) Just by pulling the joint box together, the convex tool 9a slides on the conical part of the rotation part 9b and fits into the cylindrical part.
A predetermined bonding accuracy is automatically obtained, and no special fine adjustment mechanism or operation of the bonding surface is required.

(c) Since the cross-sectional shape of the fitting device is circular, the contact between the concave side and the convex side becomes a point or a line, which reduces slip resistance and requires less pulling force.

Furthermore, since there is no restriction on the rotational direction within the joint surface at the mounting position for mounting the fitting device, the mounting accuracy is also improved.

This circular cross-sectional shape is superior to a rectangular cross-sectional shape in various respects.

(d) After the convex tool 9a is fitted into the cylindrical part of the rotating part 9b, the water stop material 10 attached around the joint surface comes into contact with the other box, and then the water stop material 10 necessary for water stop is applied to the water stop material. Since the convex tool is fitted along the rotating cylindrical portion by the amount of deformation, the shear deformation of the water stop material can be significantly reduced, and the water stop property of the water stop material is improved.

If only the conical portion is rotated, the shear deformation of the water stop material will be larger than that described above.

(e) The fitting device itself can be manufactured with high precision from steel or concrete.

Particularly, when the fitting device is manufactured in advance at a factory, the manufacturing error can be adjusted and installed after each joining unit is manufactured, so that the joining error can be further reduced.

This is effective in increasing the joining accuracy of double-row joints that require surface expansion.

In addition, the fitting device can also be molded integrally with the floating box when the floating box is molded.

(f) The optimal number of fitting devices is two, and the mounting positions should be above the water surface and on the left and right sides (it is better to install them apart).

(g) By fixing the fitting devices to each other during temporary fixation or after completion of bonding, a structure can be created as a shear key for the bonded portion.

Specific fixing methods include welding or injecting a bonding material such as adhesive or mortar into the gap between the fitting devices.

Next, the method for joining floating bodies at sea according to the present invention will be explained according to the procedure (see FIGS. 1 to 5).

(7) After adjusting the level of each moored floating box and the center position of the joint surface, both floating boxes 1, 2
attract.

In this case, the traction device 4 is operated to guide the cylindrical part of the protrusion 9a installed on the floating box 1 into the conical part of the rotation 9b of the floating box 2.

After the cylindrical part of floating box 1 enters the conical part of floating box 2, when both floating boxes are further pulled together, the cylindrical part of floating box 1 enters the conical part of floating box 2. Rotate by sliding on the tapered surface 9b
Fits into the cylindrical part of.

At this time, the pneumatic buffer material 11 absorbs the collision force caused by the movement of the floating boxes due to waves, restrains the mutual movement of the floating boxes, and facilitates the fitting of the fitting devices.

(b) Just before completing the pulling of both floating boxes, the remaining air in the pneumatic cushioning material 11 is removed, and in order to enhance the water-stopping effect of the water-stopping material on the lower side of the joint surface, A counterweight 13 or water ballast 13a is applied to the floating box to substantially complete the drawing of both floating bodies, and the water stop material 10 on the outer periphery of the joint surface is crimped.

(1) After crimping the water stop material on the joint surfaces, drain the seawater that has accumulated in the space of the joint 7 on the joint surfaces, and further remove the air from this space to reduce the pressure and increase the crimping force of the water stop material. To further perfect water-tightness.

2) After confirming the water-stopping properties of the water-stopping material, install the PC steel material 6 for joining both floating boxes by penetrating the joint surface from the inside of the floating box,
After finely adjusting the position, inclination, spacing, etc. of the joint surfaces of both floating boxes by operating the jack 12 from inside the floating box, the PC steel material 6 is temporarily tensioned to temporarily fix both floating boxes.

(3) After temporarily fixing both floating boxes, fill the joints of the joint surfaces with special bonding material 8, and after it hardens, perform main tensioning of PC steel material 6 and injection of grout to completely join both floating boxes. do.

As is clear from the above description, according to the present invention, when joining floating boxes at sea, an air cushioning material with a variable air pressure is interposed between the joint surfaces of both floating boxes to prevent the floating boxes from shaking due to waves. It is possible to absorb the collision force between the floating boxes caused by this, and to restrain the amount of oscillation displacement between the floating boxes.

Furthermore, if a fitting device in which a conical part and a cylindrical part are successively used is used together, a guiding function, positional accuracy, and shearing key function can be obtained, and an ideal construction method can be performed.

[Brief explanation of the drawings] Fig. 1 is a plan view of the floating box when it is joined, Fig. 2 is a side view of Fig. 1, Fig. 3 is a perspective view of Fig. 2, and Fig. 4 is a plan view of the floating box. An end view, FIG. 5 is a plan view of the bonded floating box, FIGS. 6 to 10 are perspective views showing examples of the pneumatic shock absorbing material, and FIG. 11 is a reaction force characteristic curve depending on the shape of the pneumatic shock absorbing material. Figure 12 is a reaction force characteristic curve due to the same internal pressure, Figures 13 and 14 are perspective views showing an example of application of the pneumatic cushioning material, Figure 15 is a longitudinal sectional view of the fitting device, and Figure 16. 17 is an end view of the floating box showing an example of the arrangement of the fitting device, and FIG. 18 is a longitudinal sectional view of the joint. In the figure, 1 and 2 are floating boxes, 5 is a joint surface, 9 is a fitting device, 9
11 is a pneumatic buffer, 14 is a conical base, and 15 is a cylindrical tip.

Claims (1)

[Claims] 1. When joining floating boxes at sea, between the joining surfaces of both floating boxes,
A pneumatic cushioning material containing variable pressure air is interposed between the joint surfaces, and the two floating bodies are pulled together without reducing the air pressure in the pneumatic cushioning material, and the two opposing joint surfaces are brought together. A method for joining floating boxes at sea, characterized by joining both floating boxes by gradually bringing them closer together while facing each other. 2. When joining floating boxes at sea, between the joining surfaces of both floating boxes,
A pneumatic cushioning material containing variable pressure air is interposed between the joint surfaces, and the two floating bodies are pulled together without reducing the air pressure in the pneumatic cushioning material, and the two opposing joint surfaces are brought together. a convex tool disposed on one joint surface and having a shape with a conical base continuing from a cylindrical tip, and a convex tool disposed on the other joint surface and opposite to the convex tool. , and is configured to be able to fit with the protrusion, and is assembled with the protrusion to form a pair of fitting devices, whereby both joint surfaces are brought into a predetermined relative position. A method for joining floating boxes at sea, characterized by joining both floating boxes while guiding and positioning the floating boxes.