JP2020143438A - Cylindrical structure and pile cap segment - Google Patents

Abstract

To enable assembling at low costs without requiring installation of form timbering at the time of the assembling.SOLUTION: A cylindrical structure 1 includes: a disc-shaped bottom part; a cylindrical side part standing from a peripheral edge part of the bottom part; and an approximately disc-shaped pile cap 4. The pile cap 4 is formed in a cylindrical shape by arranging a plurality of pile cap segments 10 in the circumferential direction and coupling the segments using joints. Each pile cap segment 10 is integrally composed of a side wall part 11 that is connected to a top surface of the side part and stands up, a pile cap part 12 that bends from the side wall part 11, extends in an approximately horizontal direction or in an arch shape, and is formed in an approximately trapezoidal shape in a plan view, and a standing wall part 13 that stands up from the other end of the pile cap part 12. Above the pile cap parts 12, an aperture 14 composed of the plurality of standing wall parts 13 is constructed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tubular structure used as, for example, an underground tank, an above-ground tank, or a foundation of an offshore wind power generator, and a top plate segment for constructing the tubular structure.

Conventionally, when constructing an oil tank, a water storage tank, or other tubular structure for storing materials, a ready-mixed concrete vehicle or the like is transported to the site and ready-mixed concrete is poured to construct a tubular structure composed of a concrete structure. It is known. However, when the site for constructing a tubular structure is, for example, a remote island, the seabed, the ocean, the summit, or a deep underground place, it may be difficult to transport a ready-mixed concrete vehicle or the like to the site to construct a concrete structure. ..

As such a cylindrical structure made of concrete, for example, an assembly container described in Patent Document 1 has been proposed. In this assembly container, an arcuate side wall divided into three parts is assembled on the cutting edge portion, and reinforcing bars are connected to the connecting portion of the gap and concrete is cast to connect them to each other to construct a cylindrical side wall. There is. A disk-shaped lid is placed in the upper opening of the side wall, and the lid is connected to the side wall with insert bolts.

Further, the rectangular segment described in Patent Document 2 is used for a tunnel having a rectangular cross section in which a plurality of segment pieces are assembled in a box shape having a rectangular cross section. In the rectangular segment having this rectangular cross section, a corner piece having a substantially L-shaped cross section is installed on the upper side surface. An upper slab piece is provided to close the upper opening between the corner pieces, and the upper slab piece is connected to the corner piece by a PC steel material.

Japanese Unexamined Patent Publication No. 10-194378 Japanese Unexamined Patent Publication No. 2010-133147

However, in the concrete assembly container described in Patent Document 1, the arcuate segments of the side walls are connected by reinforcing bars and integrated with concrete, and the lid is constructed by connecting three strip-shaped plates. are doing. Therefore, it is difficult to transport ready-mixed concrete by a ready-mixed concrete vehicle on remote islands, the seabed, or at sea. Further, when the assembled container becomes large and the upper opening has a large diameter, there is a drawback that the thin plate-shaped lid has a large deflection due to its own weight. In order to improve the strength of the lid, it is necessary to provide a beam structure on the lid and to thicken a plurality of strip-shaped plates constituting the lid, which has a drawback that the construction is complicated and the cost is high.

Further, the rectangular segment described in Patent Document 2 is a box culvert structure in which a flat plate-shaped upper plate bridge piece is connected to the hook-shaped portions of the corner pieces on both sides by a PC structure, which is different from a tubular structure such as a container. It is a thing. In this case, a ready-mixed vehicle is not required, but if the rectangular segment becomes large, it is necessary to provide a beam structure on the upper floor slab piece or increase the thickness of the upper floor slab piece for reinforcement as in Patent Document 1. There is a problem that the cost is high.
Moreover, these assembled containers and rectangular segments need to be assembled by providing internal support and scaffolding when assembling, which causes a problem that the construction period is long and the cost is high.

The present invention has been made in view of such a problem, and is a high-strength tubular structure and a top plate that can be easily assembled in a short time without the need to install a formwork support inside at the time of assembly. The purpose is to provide a segment.

The tubular structure according to the present invention has an upright side wall portion, a top plate portion that is bent from the side wall portion and extends in a substantially horizontal direction to form a substantially trapezoidal shape in a plan view, and the other end portion of the top plate portion. It has a top plate segment integrally formed with an upright wall portion that stands up from, and is formed into a tubular shape by joining and arranging a plurality of top plate segments in the circumferential direction, and a plurality of upright wall portions are formed above the top plate segment. It is characterized in that an opening made of is constructed.
According to the present invention, a plurality of top plate segments can be joined to construct a tubular structure, and since the top plate segments are integrally formed from the side wall portion to the upright wall portion forming an opening, it can be easily assembled by a joint. High strength. Moreover, it is not necessary to construct a formwork support inside the tubular structure, and the top plate segment can be assembled from the outer scaffolding. Therefore, ready-mixed concrete is not required for the assembly work, and it can be easily constructed in a short time even at a site where it is difficult to supply ready-mixed concrete such as remote islands, offshore, or underground.

Further, it is preferable that the top plate portion of the top plate segment is curved or inclined in an arch shape.
If the top plate portion of the top plate segment is arched, the strength of the tubular structure can be reinforced.

In addition, a lid that can close the opening may be installed.
Since the lid can be opened and closed with respect to the opening at the top of the tubular structure, the lid can be easily placed. Moreover, even if the tubular structure becomes large, the opening does not have to be large.

Further, at least one of the side wall portion and the upright wall portion of the top plate segment may be formed in a curved surface shape or a flat plate shape.
If the side wall of the tubular structure is curved, a cylindrical structure can be constructed, and if it is flat, a polygonal square tubular structure can be constructed. If the upright wall portion is curved, a circular opening can be formed, and if it is flat, a polygonal tubular opening can be formed.

The top plate segment according to the present invention is formed from an upright side wall portion, a top plate portion that is bent from the side wall portion and extends in a substantially horizontal direction to form a substantially trapezoidal shape in a plan view, and the other end portion of the top plate portion. It is characterized by having an upright wall portion that stands up.
A tubular structure can be constructed by assembling a plurality of top plate segments.

Since the tubular structure and the top plate segment according to the present invention can be assembled by joining the top plate segments to each other in a tubular shape, they can be easily assembled even at a site where it is difficult to transfer a ready-mixed vehicle, such as a remote island, offshore, or deep underground. .. Moreover, since each top plate segment can be manufactured in advance at the factory, it is only necessary to assemble it through a joint at the site, and the assembly efficiency is high and the manufacturing cost and the construction cost can be reduced.
Further, by assembling the top plate segment into a tubular shape, the standing wall portions abut against each other and compete with each other, so that the rigidity of the tubular structure is improved. Since each top plate segment is integrally formed with an upright wall portion, a top plate portion, and a side wall portion forming an opening, it is easy to secure assembling property and waterproofness.
Further, when assembling the tubular structure, it is not necessary to assemble the formwork support inside, and the top plate segment can be assembled to construct the tubular structure simply by installing the outer scaffolding.

It is a top view of the cylindrical structure according to 1st Embodiment of this invention. It is a vertical sectional view of the cylindrical structure shown in FIG. (A) is a perspective view of the top plate segment, and (b) is a perspective view of a modified example of the top plate segment. A lid that closes the opening. It is a vertical sectional view of the cylindrical structure according to the 2nd Embodiment. It is a top view of the large-sized cylindrical structure according to 3rd Embodiment. It is an exploded perspective view of the first top plate segment and the second segment. It is a main part exploded perspective view which shows the joint part of the 1st division body and the 2nd division body of the 1st top plate segment. It is explanatory drawing which used the cylindrical structure by an embodiment as the basis of the offshore wind power generation apparatus.

Hereinafter, the tubular structure according to the embodiment of the present invention and the top plate segment for constructing the tubular structure will be described with reference to the accompanying drawings.
1 and 2 show a cylindrical structure according to an embodiment of the present invention, and this tubular structure is a cylindrical structure 1. The cylindrical structure 1 is, for example, a water tank or an oil tank installed on a remote island, a mountaintop, an underground, or the like, and these are used as an above-ground tank or an underground tank. The cylindrical structure 1 is composed of a disk-shaped bottom portion 2, a substantially cylindrical side portion 3, a top plate 4 connected to the upper portion thereof, and a lid 5. The diameter of the cylindrical structure 1 is set to, for example, 8 m, and the diameter of the opening 14 serving as the input port and the discharge port of the contents is set to, for example, about 3 m.

The bottom portion 2 is formed in a disk shape, for example, by connecting a plurality of strip-shaped bottom segments 7a and arc-shaped bottom segments 7b with joints, for example, four strips. The side portion 3 is configured by, for example, side portions 8 having a rectangular shape in a plan view and curved in an arc shape, which are stacked in a staggered manner and connected by a joint. As the joint, for example, a bolt box joint, a cotter joint, or the like is used. Moreover, a seal member (not shown) is installed at the connecting portion between the side surfaces of the bottom segments 7a and 7b and the connecting portion between the joint surface and the main girder surface of the side segment 8 to have watertightness.

The bottom segments 7a and 7b and the side segments 8 are composed of concrete segments made of reinforced concrete plate material used for shield tunnels and the like. However, instead of the concrete segment, a synthetic segment made of concrete and steel or a steel segment made of steel may be used.
As shown in FIG. 1, the top slab 4 has a configuration in which a plurality of top slab segments 10, for example, divided into eight equal parts, are joined by joints on the side surfaces and arranged in a ring shape. The top plate segment 10 is, for example, a concrete segment made of reinforced concrete, but may be composed of a synthetic segment or a steel segment as described above.

As shown in FIG. 3A, the top plate segment 10 is substantially bent from the side wall portion 11 and the side wall portion 11 which stands on the side segment 8 and is formed in a curved surface shape (arc plate shape). A plate-shaped top plate portion 12 extending in the horizontal direction or diagonally upward and a substantially arc-shaped upright wall portion 13 standing up from the inner end portion of the top plate portion 12 are integrally formed. The portion of the top plate portion 12 may be curved and extended in an arch shape diagonally upward, or may be formed in a substantially flat shape by being inclined in the horizontal direction or upward.
Since the top plate segment 10 is formed in an integral torte shape from the side wall portion 11 to the upright wall portion 13 via the top plate portion 12 having a substantially trapezoidal shape in a plan view, this portion does not require a joint and is watertight. It has a shape.

Then, the side surfaces of a plurality of, for example, eight top plate segments 10 are joined to each other by a joint via a seal member to form a substantially cylindrical top plate 4. By assembling the top plate segments 10 to each other, a substantially cylindrical opening 14 is formed between the standing wall portions 13 rising in the center. Since the standing wall portions 13 abut on each other on the side surfaces and compete with each other, the rigidity of the opening 14 is high.
The top plate segment 10 has, for example, a height of 50 cm for each of the side wall portion 11 and the upright wall portion 13, an upper side of 120 cm, a lower side of 310 cm, and a height of 250 cm between the upper side and the lower side of the plan view trapezoidal top plate portion 12.
Note that FIG. 3B shows a top plate segment 10 according to a modified example, in which the side wall portion 11 and the upright wall portion 13 are formed in a flat plate shape. As a result, an octagonal tubular structure can be assembled by joining a plurality of, for example, eight top plate segments 10.

Further, as shown in FIG. 4, the lid 5 that is placed on the opening 14 and closed is a substantially disk in which, for example, a strip-shaped lid segment 16a and an arc plate-shaped lid segment 16b are joined via a joint. It is formed in a shape. Although the lid segments 16a and 16b are also manufactured of concrete segments, they may be composed of synthetic segments or steel segments as described above. The joints of the top plate segment 10 and the lid segments 16a and 16b are also composed of bolt box joints and cotter joints.
When the inner diameter of the opening 14 is larger than 3 m, the lid 5 may be combined with four or more lid segments 16a and 16b. Alternatively, the lid 5 may not be provided, and in that case, the upright wall portion 13 forming the opening 14 of the top plate 4 may be further extended upward to form a tubular shape.

These bottom segments 7a and 7b, side segments 8, top plate segments 10 and lid segments 16a and 16b can be manufactured in advance at the factory. A seal member (not shown) is installed at the connecting portion between the side surfaces of the top plate segment 10 and the connecting portion between the side surfaces of the lid segments 16a and 16b to have watertightness. The joint portion between the side segment 8 and the bottom portion 2, the joint portion between the side portion segment 8 and the top plate segment 10, and the joint portion between the top plate segment 10 and the lid 5 can also be watertightly joined by the sealing member.

The cylindrical structure 1 according to the first embodiment has the above-described configuration, and then the assembly method thereof will be described.
First, on a remote island or the like, after the outer scaffolding is assembled, the bottom segments 7a and 7b are joined to each other and the bottom 2 is installed on the floor or on the ground. Next, the side segment 8 is joined to the upper peripheral edge of the bottom 2 via a joint, and the side segment 8 is horizontally shifted by half the length so as to form a staggered structure on the upper stage through the joint. To join. This stacking work is carried out to an appropriate height to construct the side portion 3.
Next, the side wall portion 11 of the top plate segment 10 is joined to the upper surface of the side portion 3 via a joint. Eight top plate segments 10 are sequentially joined to the side surface in the circumferential direction via a joint. In this way, the cylindrical structure 1 can be constructed. Then, after the contents such as water and petroleum are supplied and stored in the cylindrical structure 1 through the opening 14, the lid 5 is placed in the opening 14 and closed. A lid 5 having a hole for piping may be placed in advance, and the contents may be supplied into the cylindrical structure 1 through the hole.

As described above, according to the cylindrical structure 1 according to the first embodiment, the bottom segments 7a and 7b, the side segments 8 and the top slab segments 10 are joined to each other via a joint during assembly to make them watertight. Can be assembled. In particular, the top plate segment 10 can be formed in a cylindrical shape by covering the upper surface from the side portion 3 and has high strength.
Therefore, it can be easily assembled on remote islands, offshore, seabed, above ground, underground, etc. without using concrete of ready-mixed concrete. Moreover, since each segment can be manufactured in advance at the factory, it is only necessary to assemble it through a joint at the site, and the assembly efficiency is high and the manufacturing cost and the construction cost can be reduced.

Further, by assembling the top plate segments 10 into a tubular shape, the standing wall portions 13 come into contact with each other and compete with each other, so that the rigidity of the structure is improved. Since each of the top plate segments 10 for assembling the top plate 4 is integrally formed with the upright wall portion 13, the top plate portion 12, and the side wall portion 11, waterproofness, high strength, and ease of assembly can be ensured.
Moreover, according to the cylindrical structure 1 according to the present embodiment, it is not necessary to set up a formwork support inside the cylindrical structure 1, and the side segment 8 and the top plate segment 10 are assembled only by installing the outer scaffolding. Can be done.

Although the cylindrical structure 1 according to the first embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and appropriate modifications and substitutions are made without departing from the spirit of the present invention. Etc., all of which are included in the present invention. Hereinafter, modifications of the present invention, other embodiments, and the like will be described, but the same reference numerals will be used for the same or similar parts and members as in the first embodiment described above, and the description thereof will be omitted.

FIG. 5 shows the cylindrical structure 20 according to the second embodiment of the present invention. In the present embodiment, the cylindrical structure 20 is composed of a bottom portion 2, a top plate 4, and a lid 5, and a side portion 3 is not provided.
As an example of this modification, the bottom portion 2 may not be installed, and even in this case, the side wall portion 11 of the top plate segment 10 may be directly installed on the ground, the floor surface, the seabed, or the like. Watertightness can be ensured by burying the lower end of the side wall portion 11 in the ground or by interposing a sealing member between the side wall portion 11 and the floor surface.

Next, FIGS. 6 to 8 show a cylindrical structure 25 according to a third embodiment of the present invention. The cylindrical structure 25 according to the third embodiment is for constructing a cylindrical structure having a larger scale than that of the first embodiment, for example, an underground tank or an above-ground tank having an outer diameter of 16 m and an opening 14 having an inner diameter of 3 m. Can be assembled.
It is assumed that the bottom portion 2 and the side portion 3 of the cylindrical structure 25 according to the present embodiment have the same configuration as that of the first embodiment, and the illustration is omitted. In the top plate 4 shown in FIGS. 6 and 7, the first top plate segment 26 and the second top plate segment 27 are alternately arranged and assembled to be divided into 16 equal parts. The first top plate segment 26 and the second top plate segment 27 are both concrete segments and have the same shape. Moreover, although the first top plate segment 26 and the second top plate segment 27 are both composed of two divided bodies, the divided positions of the top plate portion 12 in the longitudinal direction are deviated by about 1 m. The first top plate segment 26 is formed by the first division body 26a and the second division body 26b, and the second top plate segment 27 is formed by the first division body 27a and the second division body 27b.

At the joint between the first divided body 26a and the second divided body 26b shown in FIG. 8, the first divided body 26a has a first stepped portion 28a whose lower portion projects toward the tip end side with respect to the upper portion. The second divided body 26b has a second stepped portion 28b whose lower portion is retracted with respect to the upper portion. The joint portion between the first divided body 27a and the second divided body 27b is also formed by the first stepped portion 29a and the second stepped portion 29b having the same configuration.
Then, when joining the first divided body 26a and the second divided body 26b, the second stepped portion 28b of the second divided body 26b is placed on the first stepped portion 28a of the first divided body 26a and joined. To do. Moreover, bolt holes 31a and 31b are formed in the first stepped portions 28a and 29a and the second stepped portions 28b and 29b, respectively. With the first stepped portions 28a and 29a and the second stepped portions 28b and 29b joined, the fixing bolt 32 is screwed into the bolt holes 31a and 31b and tightened. As a result, the first divided bodies 26a and 27a and the second divided bodies 26b and 27b are connected to each other via the seal member, respectively.

Then, when assembling the cylindrical structure 25, the bottom segment 7 of the bottom 2 is assembled, and the side segment 8 of the side 3 is assembled. Next, when assembling the first top plate segment 26 and the second top plate segment 27 on the upper surface of the side portion 3, the first split body 26a and the second top plate segment of the first top plate segment 26 are on the upper surface of the side portion segment 8. The first divided bodies 27a of 27 are alternately arranged and assembled via joints. Next, the second stepped portion 28b of the second split body 26b is joined to the first stepped portion 28a of the first split body 26a, and the fixing bolt 32 is tightened into the bolt holes 31a and 31b.
Then, the second stepped portion 28b of the second split body 27b is joined to the first stepped portion 28a of the first split body 27a, and the fixing bolt 32 is tightened into the bolt holes 31a and 31b. By performing this work on all the first top plate segments 26 and the second top plate segments 27 in the circumferential direction, the top plate 4 is constructed, and an opening 14 composed of 16 upright wall portions 13 is formed in the center. ..

FIG. 9 shows an example in which the cylindrical structures 1, 20 and 25 are applied to other than the underground tank and the above-ground tank. In this embodiment, for example, a cylindrical structure 1 is used as the base portion 36 for the offshore wind power generation device 35. In the present embodiment, the bottom portion 2 and the side portion 3 are constructed as the foundation portion 36, and the top plate 4 composed of the first top plate segment 26 and the second top plate segment 27 is constructed on the upper portion of the side portion 3. Then, the hollow lower end portion of the tower 37 was attached to the outside of the opening 14 constructed by the upright wall portion 13 of the top plate 4. At the top of the tower 37, a nacelle 38 and, for example, three blades 40 installed on the hub 41 are provided. The tower 37 is rotatable around the opening 14 of the upright wall portion 13.
In this offshore wind power generator 35, the rotation of the blade 40 by the wind power is obtained and power is generated by a generator in the nacelle 38, for example. Moreover, the tower 37 and its upper portion can be rotated in the forward and reverse directions so as to face each other in response to the change in the wind direction by the posture correction mechanism (not shown) installed in the foundation portion 36. In addition, ballast water is stored in the foundation portion 36.

The tubular structure according to each of the above-described embodiments and modifications is a square cylindrical structure such as a cylindrical structure 1, 20, 25 or an octagonal tubular structure, but the square tubular structure has an appropriate polygonal tubular shape. Can be adopted.
In the top plate segments 10, 26, 27, both the side wall portion 11 and the upright wall portion 13 are formed in an arcuate shape or a flat shape, but one of them is in the shape of an arc plate and the other is in a flat shape. It may be. If the upright wall portion 13 has a flat plate shape, a polygonal tubular opening 14 is formed. Further, if the side wall portion 11 has an arcuate shape, cylindrical structures 1, 20 and 25 are formed, and if the side wall portion 11 has a planar shape, it becomes a polygonal tubular square cylinder structure.
Further, although the above-mentioned top plate segments 10, 26, and 27 are made of reinforced concrete, synthetic segments or steel segments may be used instead.

1, 20, 25 Cylindrical structure 2 Bottom 3 Side 4 Top plate 5 Lid 7 Bottom segment 8 Side segment 10 Top plate segment 26 First top plate segment 26a, 27a First split body 26b, 27b Second split body 27 Second top plate segment 11 Side wall part 12 Top plate part 13 Upright wall part 14 Opening 16a, 16b Lid segment 35 Offshore wind power generator 36 Foundation part 37 Tower

Claims (5)

An upright side wall portion, a top plate portion that is bent from the side wall portion and extends in a substantially horizontal direction to form a substantially trapezoidal shape in a plan view, and an upright wall portion that stands up from the other end of the top plate portion. , Has an integrally formed top plate segment,
A tubular structure characterized in that a plurality of top plate segments are joined and arranged in the circumferential direction to form a tubular shape, and an opening composed of the plurality of upright wall portions is constructed above the tubular structure. The tubular structure according to claim 1, wherein the top plate portion of the top plate segment is curved or inclined in an arch shape. The tubular structure according to claim 1 or 2, wherein a lid capable of closing the opening is installed. The tubular structure according to any one of claims 1 to 3, wherein at least one of the side wall portion and the upright wall portion of the top plate segment is formed in a curved surface shape or a flat plate shape. An upright side wall portion, a top plate portion that is bent from the side wall portion and extends in a substantially horizontal direction to form a substantially trapezoidal shape in a plan view, and an upright wall portion that stands up from the other end of the top plate portion. A top plate segment characterized by having,.

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