JPS6117717B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing floating docks and other prestressed concrete marine structures.

According to the cast-in-place concrete method, which is the conventional construction method for offshore structures made of prestressed concrete, offshore structures have to occupy the dock area for a long period of time during the concrete pouring process, and require a large amount of strong molds. The required frame significantly increases construction costs. Furthermore, when building a large-scale structure, there are problems such as unavoidable unevenness of materials during on-site casting and a prolonged construction period.

In recent years, in the construction field, the precast panel method has been widely used for concrete structures, but this method is not suitable for use in offshore structures because it does not strictly consider waterproofness and watertightness. I can say that. In addition, in the civil engineering field, bridges,
Recently, precast members have been increasingly used for immersed pipes, etc., but due to their simple shape and lack of consideration for offshore structures as floating bodies, there are various problems with using them as they are. There's a problem.

In order to solve the above-mentioned conventional drawbacks and problems, the present invention aims to manufacture precast parts as early as possible in a factory with strict quality control and process control.
Prestressed concrete is manufactured in a yard, etc., with the aim of reducing the work inside the dock, making the material uniform, shortening the construction period, and saving labor. It also has a structure that has high resistance to loads such as hydrostatic pressure as concrete. The purpose is to provide manufactured marine structures.

That is, in the first method of constructing a prestressed concrete marine structure according to the present invention, a prestressed concrete unit hollow body having a predetermined wall thickness and a predetermined length is protruded laterally from the side surface of the unit hollow body. Multiple sets consisting of upper and lower male joint surfaces and upper and lower female joint surfaces that are opened by cutting out the wall thickness on the side surface of the unit hollow body corresponding to these male joint surfaces are fabricated in separate yards, and then docked. The female bonding surface of the unit hollow body fitted into the male bonding surface of the unit hollow body is crimped by prestress introduced in the crimping direction of the female bonding surface, and multiple sets of unit hollow bodies are bonded with adhesive interposed on the bonding surface. This is characterized in that the unit hollow bodies are integrated in the lateral direction, and the end surfaces of the unit hollow bodies are used as joint surfaces.

Further, in the second method of constructing a prestressed concrete marine structure according to the present invention, a prestressed concrete unit hollow body having a predetermined wall thickness and a constant length is protruded laterally from the side surface of the unit hollow body. The upper and lower male joint surfaces are made in separate yards, and the upper and lower female joint surfaces are opened by cutting out the wall thickness on the side surface of the unit hollow body corresponding to the male joint surfaces. The female joint surface of the unit hollow body fitted into the male joint surface of the unit hollow body within the dock is crimped by prestress introduced in the crimping direction of the female joint surface, and many sets of unit hollow bodies are bonded between the joint surfaces. At the same time, the end faces of the unit hollow bodies are used as joint surfaces, and a prestressed concrete unit transverse bulkhead with an external shape that follows the shape of this end face is fabricated in a separate yard, and the unit hollow bodies are assembled in a dock. The unit transverse bulkhead is connected to the end face of the unit hollow body and crimped in the length direction by the introduced prestress, and the unit transverse bulkhead is integrated with the end face joining surface of the unit hollow body using an adhesive.

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

FIG. 1 is a cross-sectional view of a main part of a floating dock according to an embodiment of the present invention, FIGS. 2 and 3 are perspective views of a unit hollow body 1A shown in FIG. 1 and a perspective view of a unit transverse bulkhead corresponding thereto, 4 and 5 are perspective views of the unit hollow body 1B shown in FIG. 1 and the corresponding unit transverse bulkheads, and FIGS. 6 and 7 are perspective views of the unit hollow body 1C shown in FIG. 1. Fig. 8 is a cross-sectional view of the main part showing the horizontal connection method in the same embodiment, and Fig. 9 is a case where the vertical partition wall shown in Fig. 8 has an opening. FIG. 10 is a perspective view of the main parts of the floating dock in the same embodiment.

In the embodiment of the present invention described below, a floating dock is shown, and as shown in this embodiment, the present invention is considered to be sufficiently general.

First, in the cross-sectional view of the main part of the floating dock in Fig. 1, the precast panel 1 is composed of unit hollow bodies 1A, unit hollow bodies 1B, two unit hollow bodies 1C, etc., which are integrated in the cross-sectional direction. It is composed of many groups. In principle, each unit hollow body is connected to the same length in the length direction, but due to the structure, there are cases where all the unit hollow bodies are not connected to the same length. It is important to determine the unit hollow body by taking into account its structure, shape, size, weight limitations, etc., and also to make as many of the same shapes as possible.

As shown in FIG. 2, a unit hollow body 1A formed to a predetermined length with a predetermined wall thickness has a joint surface 2 formed on the end face in the length direction, and an upper and lower male joint protruding from the side surface and extending over the entire length. The member shown in FIG. 3 is a unit transverse bulkhead 4 corresponding to the unit hollow body 1A, and this unit transverse bulkhead 4 can also be used for the bow and aft wall 4A of a floating dock.

It is also conceivable that the unit horizontal partition wall 4 is provided with an opening 5 as shown in the figure, if necessary.

The unit hollow body 1B shown in FIG. 4 is provided with upper and lower female joint surfaces 3a with the side wall thickness removed and a joint surface formed on the end surface. A female joint surface 3a that fits into the female joint surface 3 of the unit hollow body 1A described above and the unit hollow body 1C shown in FIG.
are crimped with prestress introduced in the crimping direction of the female joint surface 3a so as to form pairs with adjacent unit hollow bodies via adhesive, thereby making a large number of sets of each unit hollow body continue in the lateral direction. It is becoming more and more integrated. The corresponding unit transverse partition walls 4' and 4'' are shown in FIGS. 5 and 7, respectively.

It is also conceivable to provide the unit transverse partition walls 4' and 4'' with openings 5 as shown in the drawings, if necessary.

When manufacturing the unit hollow bodies 1A, 1B, and 1C that make up these precast panels 1 in a factory or in a block yard, it is especially important to emphasize that all of these blocks are most suitable for hard hammering. Suitably (but horizontal casting shall also be taken into consideration), the unit transverse bulkhead 4 is connected to each unit hollow body 1A, 1.
This means that we considered forming blocks to suit the cross-sectional shapes of B and 1C. Note that the unit transverse partition wall 4 is manufactured by itself as a prestressed panel 1.

In addition, the joint surfaces 2 formed on the end faces of each of these unit hollow bodies 1A, 1B, 1C are either overlapped with the adjacent unit hollow bodies or cut with a cutting tool, etc., and the horizontal male joint surfaces 2 are and female joint surface 3a
As a general rule, when joining the whole part by overlapping, it should be joined accurately so that it can be made to the specified dimensions.

Next, FIG. 8 shows a method for horizontally connecting each unit hollow body that makes up the precast panel 1.
Prestressing by the PC steel material 8 is introduced to complete the adhesion, but the prestressing by the PC steel material 8 not only gives up on the bonded part of the lateral joint surface 3, but also takes into account it if necessary for lateral strength. Also consider placing it. At this time, a protrusion 7 is provided as the PC fixing part 6, but this also needs to be fully extended in the vertical direction in consideration of vertical placement.

Note that there is an opening 9 in the vertical bulkhead of the precast panel 1.
In some cases, PC fixing sections 6 are provided at both ends of the opening 9 as shown in FIG.

Therefore, the overall combination diagram shown in FIG. 10 will be explained. Each unit hollow body 1A manufactured as described above,
1B, 1C, the unit transverse bulkheads 4, and the bow and aft walls 4A are coated with adhesive such as epoxy on the respective end face joint surfaces 2, female joint surfaces 3, and female joint surfaces 3a in the dock, and then pre-assembled in the longitudinal and transverse directions. Introducing stress
Combine and integrate.

At this time, the unit transverse partition walls 4 are formed as individual precast panels 1, but the unit transverse partition walls 4 do not necessarily need to be included in each unit hollow body continuous in the vertical direction, and may be arranged as necessary. Whether to join partially or completely should be selected based on a comprehensive judgment of the scale, shape, construction period, location, etc. of the structure, and whether to introduce prestressing in the vertical direction first. Similarly to the above, the location of the horizontal end is also determined by the type of structure, construction method, etc.

In FIG. 10, the prestress in the vertical direction is indicated by an arrow _PL , and the prestress in the lateral direction on the unit transverse partition wall 4 is indicated by an arrow _PW .

Next, the construction process according to the method of constructing a prestressed concrete marine structure of the present invention will be explained.
A plurality of unit hollow bodies 1A, 1B, 1C and unit transverse bulkheads 4, 4',
When manufacturing 4" etc., we try to make as many of the same shapes as possible, so there are many products with the same shape, so if you make a strong formwork such as steel, you can reuse this formwork. be able to.

Once each unit hollow body and unit transverse bulkhead are manufactured, they are transported to the dock by a transport vehicle. Next, apply adhesive to the end surface mating surface 2, male mating surface 3, and female mating surface 3a in the dock to introduce prestress and integrate them.
The ship will then leave the dock and undergo final outfitting at the outfitting quay.

In the construction method of the present invention, vertical pouring, which is easy to compact, is used in principle to obtain homogeneous concrete that is easiest to pour. In the case of vertical casting, the length of the block is determined by taking into consideration the height at which it can be placed.
Therefore, in the first method of constructing a prestressed concrete offshore structure according to the present invention, a unit hollow body made of prestressed concrete having a predetermined wall thickness and a predetermined length is horizontally attached to the side surface of the unit hollow body. The upper and lower male joint surfaces that protrude from the top and bottom, and the upper and lower female joint surfaces that are opened by cutting out the wall thickness on the side surface of the unit hollow body that corresponds to the male joint surfaces are manufactured in multiple sets in separate yards. As a result, since there are many unit hollow bodies of the same shape in yards and factories, it is possible to manufacture a large number of parts even if a few strong formworks such as steel are prepared, reducing manufacturing costs and labor. Not only can this contribute greatly to the development of technology, but it can also significantly shorten the manufacturing period.

When introducing prestress in the dock, the female bonding surface, which is easy to crimp by eliminating the wall thickness of the unit hollow body, is effectively utilized to connect the horizontally adjacent paired unit hollow bodies. By crimping the female joint surface, it is possible to simplify a series of assemblies and integrate many sets of unit hollow bodies in the lateral direction, thereby greatly improving the efficiency of work inside the dock.

Further, since the end faces of the unit hollow bodies are used as joint surfaces, by utilizing these end face joint surfaces, the unit hollow bodies can be integrated in a continuous manner in the length direction within the dock.

Further, in the second method for constructing a prestressed concrete marine structure according to the present invention, a prestressed concrete unit hollow body having a predetermined wall thickness and a predetermined length is protruded laterally from the side surface of the unit hollow body. The upper and lower male joint surfaces that correspond to the male joint surfaces and the upper and lower female joint surfaces that are opened by removing the wall thickness on the side surface of the unit hollow body correspond to the male joint surfaces, and the end face shape of the unit hollow body is Since there are many unit hollow bodies and unit transverse bulkheads of the same shape in yards and factories, by manufacturing unit transverse bulkheads with external shapes that follow the same shape in separate yards, it is possible to reduce the number of strong formworks made of steel etc. Even if a large number of parts are prepared, it is possible to manufacture a large number of parts, which not only greatly contributes to reducing manufacturing costs and saving labor, but also significantly shortens the manufacturing period.

When introducing prestress in the dock, the female bonding surface, which is easy to crimp by eliminating the wall thickness of the unit hollow body, is effectively utilized to connect the horizontally adjacent paired unit hollow bodies. By crimping to the male joint surface, several sets of unit hollow bodies can be integrated in the lateral direction, and furthermore, by the prestress introduced within the dock, the end surface of the unit hollow body can be effectively utilized to form a unit horizontally. Combined with the ability to integrate the partition wall into the unit hollow body and close the end face of the unit hollow body, this type of series of assemblies can be facilitated and the efficiency of work inside the dock can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a floating dock according to an embodiment of the present invention, and FIGS. 2 and 3 are perspective views of a unit hollow body shown in FIG. 1 and a corresponding unit transverse bulkhead. 4 and 5 are a perspective view of the unit hollow body shown in FIG. 1 and a corresponding perspective view of the unit transverse bulkhead, and FIGS. 6 and 7 are a perspective view of the unit hollow body shown in FIG. 1 and a perspective view thereof. A perspective view of the corresponding unit transverse bulkhead, FIG. 8 is a cross-sectional view of the main part showing the horizontal connection method in the same embodiment, and FIG. 9 is a main part when the vertical partition wall of FIG. 8 has an opening. Cross-sectional view of, No. 10
The figure is an overall assembled perspective view of the main parts of the floating dock in the same embodiment. 1... Precast panel, 1A... Unit hollow body, 1B... Unit hollow body, 1C... Unit hollow body,
2...End surface mating surface, 3...Male bonding surface, 3a...Female bonding surface, 4, 4', 4''...Unit transverse bulkhead, 4A...
Fore and aft wall, 6...PC fixing part, 7...Protrusion, 8
...PC steel material.

Claims (1)

[Scope of Claims] 1. A unit hollow body made of prestressed concrete having a predetermined wall thickness and a predetermined length is connected to upper and lower male joint surfaces that protrude laterally from the side surface of the unit hollow body, and to this male joint surface. A plurality of sets consisting of upper and lower female joint surfaces that are opened by cutting out the wall thickness on the side surface of the corresponding unit hollow body,
The female joint surfaces of the unit hollow bodies were manufactured in a separate yard and fitted into the male joint surfaces of the unit hollow bodies in a dock, and the female joint surfaces of the unit hollow bodies were crimped by a prestress introduced in the crimping direction of the female joint surfaces, resulting in multiple sets of unit hollow bodies. A method of constructing a prestressed concrete marine structure in which the structures are laterally integrated using an adhesive interposed on the joint surfaces, and the end surfaces of the unit hollow bodies are used as the joint surfaces. 2. A large number of unit hollow bodies that are continuous in the length direction in a dock are crimped in the length direction by the introduced prestress, and the end faces of the unit hollow bodies are used as joint surfaces to integrate with adhesive, and a large number of unit hollow bodies that are continuous in the horizontal direction are 2. The method of constructing a prestressed concrete marine structure according to claim 1, wherein the set of unit hollow bodies are further continued in the length direction.