JPS59179932A - Joining of curved concrete material body - Google Patents

Abstract

PURPOSE:To easily and exactly join the ends of concrete curved materials by a method in which the tips of steel connectors having curved end faces are welded to the end faces of concrete materials fixed with steel connectors at a right angle and burried in concrete for hiding. CONSTITUTION:Plural concrete curved materials 8 are formed while driving plural sheaths 9 inside, and connecting metals 14 are joined with the ends of the concrete materials 8. The lower ends of the vertical internal structural materials 5 and outside plates 4 are shaped into a horizontal and linear form and also burried with the upper half portion of linearly vertical steel joining plate metals 16. The tips of two connecting metals 14 of curved materials 8 are welded to both sides of the joining plate metals 16 of the internal structural materials 5 and concrete 19 is placed to bury the metals 14 and 16. The concrete curved materials 8 can thus be simply connected with the internal structural materials 5, and therefore, the lower structural body 2 can be easily constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining curved concrete bodies, and more particularly to a method for joining the ends of two curved concrete bodies on both sides of the ends of a concrete material.

Recently, water sea structures using concrete caissons have been developed for oil field development and oil extraction in water seas. Concrete water-sea structures are cheaper (and have better corrosion resistance and durability) than steel ones, but they are heavier and therefore have a larger light load. Water-sea structures are Whether it is a floating type or a bottom-mounted type, it is often towed floating on the sea surface from the dock at the manufacturing site to the installation site. , it is necessary to reduce the light load drop to some extent.However, in the case of concrete water-sea structures, the light load drop is large due to the large weight.
It may not be possible to pull it out from the dock and pull it into place. In contrast, steel water-sea structures
Compared to concrete, pumice reduces light load drainage, but it is more expensive and has poor corrosion resistance and durability.

In order to solve the above-mentioned problems, the present applicant has developed a hydraulic system with the aim of simultaneously satisfying the following conditions: low cost, excellent corrosion resistance, and durability, and the ability to reduce water drop during light loads. A combination of multiple curved bodies in which the stone side part that receives water pressure is made of concrete, the upper part is made of steel, and the bottom plate of the lower part has an upwardly curved approximately cylindrical or approximately spherical surface. We proposed a water-sea structure characterized by being composed of. Many of these underwater structures are large, and it is difficult to form their concrete bottom plates into one piece, so the bottom plate is constructed by joining together multiple concrete curved bodies that have been formed separately. However, joining curved concrete bodies is generally difficult and fraught with problems.

An object of the present invention is to provide a rational joining method that can easily and reliably join the ends of two concrete curved bodies to both ends of concrete H.

In the joining method according to the present invention, when joining the ends of two concrete curved surfaces on both sides of the concrete material, a steel plate joining fitting is fixed to the end surface of the concrete material at almost a right angle, and each curved surface is At least two steel plate joint fittings are fixed at almost right angles to the end faces of the body, the tips of the joint metal fittings of each curved surface are welded to each side of the concrete joint metal fittings, and these joint metal fittings are buried and concealed by concrete. It is characterized by this.

According to this invention, these can be easily and reliably joined by simply welding the tip of the joining fitting fixed to the end face of the concrete curved body to the concrete 1 to one side of the joining fitting fixed to the end face of the material. be able to. Therefore, multiple −
Even when constructing a structure that combines one curved surface made of concrete, the structure can be easily constructed by making multiple curved surfaces and concrete materials separately and joining them using the method of this invention. can be constructed.

The present invention will be described in detail below with reference to the drawings.

Figures 1 and 2 show a rectangular parallelepiped valley-bottom water-sea structure, which protrudes above the sea surface (1).
Concrete placed in 1〉 and subjected to water pressure and water pressure - 1~
It consists of a special lower structure (2) and a steel upper structure (3) bonded thereon.

The vertical outer plate (4) and vertical internal structural members (5) and (6) (hereinafter referred to as internal structural members) of the lower structure (2) are all made of prestressed concrete (hereinafter referred to as PC), and the bottom plate ( 7) is constructed by joining together a plurality of PC curved bodies (8) each having an upwardly curved cylindrical surface. As shown in detail in FIG. 3, the curved body (8) is formed of concrete in the shape of a cylinder cut by two planes perpendicular to the axis and two planes passing through the axis, Its planar shape is a square. Further, both end surfaces of the curved surface body (8) in the circumferential direction are straight planes facing diagonally downward, and both end surfaces in the axial direction are vertical planes in the shape of an arc curved upward. A plurality of arc-shaped sheaths (9) passing through the curved body 8) in the circumferential direction and a plurality of straight sheaths (shown as shown) passing through the curved body 8) in the axial direction are driven into the curved body 8). Straight steel plates (10) of approximately the same size as the curved body (8) are applied to both end faces in the circumferential direction of the curved body (8). 9) and the steel plates (10) at both ends thereof, and is fixed under tension by pulleys 1-(12) screwed to both ends thereof.

In addition, arc-shaped steel plates (13) of approximately the same size are applied to both end faces in the axial direction of the curved body (8>), and although not shown, a plurality of straight PC steel bars are connected to each other in a straight line. It passes through the shaped sheath and the steel plates (13) at both ends, and is similarly fixed under tension with nuts.This allows the curved body (8) and the steel plates (10) (13) at its four ends to
) are firmly joined in a compressed state, and prestress is introduced into the curved body (8). These sheaths 9) are filled with grout through which PC steel rods (11) are inserted. Steel plate (
10), two parallel upper and lower linear steel plate joining fittings (14) are fixed at right angles to the outer surface of the steel plate (13), and two parallel upper and lower arc-shaped joint fittings (14) are fixed to the outer surface of the steel plate (13) having an arc-shaped end surface. A steel plate joint fitting (15) is fixed at right angles. The upper straight joint metal fitting (14) and the upper arcuate joint metal fitting (15)
) is continuous at the corner of the curved body (8), and the lower straight joint metal fitting (14) and the lower arcuate joint metal fitting (15) are continuous at the corner of the curved body (8). There is. Further, the outer tips of all the joining fittings (14) (15) are located on the side surface of a quadrangular prism having a square planar shape. On the other hand, the vertical inner structural member (5) and the outer plate of the lower structure (2)
4) The lower end surfaces are formed into horizontal straight lines, and the upper halves of straight vertical steel plate joint fittings (16) are embedded in these lower ends, and the inner parts of each fitting fitting 16) are embedded. A large number of stud dowels <17) are fixed to both sides of the part embedded in the structural member (5) and the outer plate 4). . 1t,: The lower end surfaces of the lateral inner structure member (6) 83 and the outer plate (4) of the lower structure (2) are curved upwardly in a circle corresponding to the arc-shaped end surface of the curved body (8). They are formed in an arc shape, and the upper half of a vertical arc-shaped joining fitting (18) made of a steel plate is similarly embedded in the lower end portion of these. And curved surface (8)
A curved body (8) is attached to one side of the inner structural member (5) J5 whose tip is the straight end of the joint (14) in the vertical direction, and the straight joint (16) at the end of the outer plate (4). ) are joined by welding to one side of the arc-shaped joint fittings (18) at the lower ends of the inner structural member (6) and the outer plate (4) in the lateral direction. In addition, the joining fittings (16) for the inner structural members (5) (6) and the outer panel (4)
(18) and curved body (8) joining metal fitting (+4) (1
5), concrete 1-(19) is poured to cover and hide these after welding.

The lower structure (2) is constructed, for example, as follows.

First, a plurality of concrete curved bodies (8) are molded separately, and a plurality of sheaths (9) are placed inside them at the time of molding. Once the concrete of the curved body (8) has hardened, insert the PC steel rod (11) through these sheaths (9), and attach the steel plates (10) to both end faces of the PC steel rod (11) using nuts (12). ) (13) and P
Put the C steel rod (11) under tension and introduce Presto 1 Nos. into the curved body (8). Then, these steel plates (io
> On the outer surface of (13), attach metal fittings (+4) (15
> is fixed by welding. At the same time, -1・
Sacred part of structure (2) Rope 15 Outer plate (4) 6
3 and internal structural members (5) and (6) are divided into flocks of appropriate size and molded, and joining metal fittings (
16) Embed (18). Then, by sequentially joining the curved surfaces (8) to these 10 blocks and joining the blocks together, the ■τ section structure (2) is assembled.For example, the When joining the ends of two curved bodies (8), first
2 of one curved surface body (8) on one side of the joint fitting (16) of ).
Weld the ends of the two joining fittings (14), and then weld the inner structural members (
5) On the opposite side of the joining fitting (16), attach the curved surface (
Weld the ends of the two joint fittings (14) in 8), and finally attach the two joint fittings (14) with the
4) < 16) is buried and hidden 1° (Pull to other parts) The same is true for joining. In addition, the outer plate (4) and the inner structural material (5)
) (6) is tall, the blocks constituting these are further divided into upper and lower parts, and the lower structure (2) is created by joining the lower 7 Cl block and the curved body (8).
It is also possible to form the bottom part and then bond the upper part on top of it.

The bottom plate (7) of the lower structure (2) may be constructed by joining a plurality of PC curved bodies (20) each having an upwardly curved spherical surface as shown in FIG. The four arc-shaped end surfaces of the curved body 20) in FIG.
It is joined to the F end of 4). In addition, in Fig. 4,
Components that are the same as in Figure 3 are given the same symbols.

The above joining method has the following advantages.

At the same time, a prestress is introduced into the curved body (8) by the PC steel rod (11), and at the same time a joining metal fitting (7) is attached to the end surface.
4) (15) can be fixed, and these joint fittings (+4+ < 15) can be attached to internal structural members (5) (6).
) and the joining metal fittings at the lower end of the outer plate (4) <16) (
i, 9) can be easily joined by welding.

Therefore, a plurality of curved bodies (8) constituting the bottom plate (7>)
and 1 constituting the outer plate (4) and inner structural members (5) and (6).
The lower structure (2) can be easily constructed by separately making the 0 and 0 pieces and joining them together using the method described above.

Top 4Iiii (30) of superstructure (3), vertical outer plate (
31) and vertical internal structural members (32) are all made of mild steel. Then, the entire lower end of the outer plate (31) of the upper structure (3) and the lower end of the inner structural member (32) are connected to the upper end of the outer plate (4) of the lower structure (2) by appropriate means. and is joined to the upper end of the internal structural member (5).

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway plan view of a bottom-mounted underwater structure, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is Fig. 2 FIG. 4 is a perspective view showing a modified example of the curved body constituting the bottom plate of the lower structure. (5) (6)...PC internal structural members, 8) (20)
)...PC curved body, (14) (15) (1
6) (18)...Joining metal fittings, (19)...Concrete. 4 people other than the above Continued from page 1 Author: Masakatsu Matsuishi Hitachi Zosen Corporation, 1-6-14 Edobori, Nishi-ku, Osaka Author: Setsuo Iwata 1-6 Edobori, Nishi-ku, Osaka No. 14 Inside Hitachi Zosen Corporation

Claims (1)

[Claims] ='' When joining the ends of the screen body to the two concrete 1s on both sides of the concrete material, the steel plate joining fittings are fixed almost at right angles to the end faces of the concrete materials, and at least It is characterized by fixing two steel plate joining fittings at almost right angles and welding the ends of the joining fittings of each curved surface to each side of the concrete joining fittings, and hiding these joining fittings with concrete. A method for joining concrete curved bodies.