JP2023150707A - Anchor device, and construction method for anchor device - Google Patents

Abstract

To provide an anchor device for tanks which allows a large diameter tank to be installed in a simple process and is excellent in pull-out resistance, and a construction method for the anchor device.SOLUTION: An anchor device comprises: an anchor frame having an upper ring plate in an annular shape, a lower ring plate in an annular shape, and a stanchion member engaging the upper ring plate and the lower ring plate to face opposite to each other as holding a specific gap therebetween; a height adjusting member capable of adjusting a height position of the anchor frame for a surface of substrate concrete; and an anchor bolt that is fixed on at least one of the upper ring plate and the lower ring plate and partly buried in a mat foundation structure.SELECTED DRAWING: Figure 2

Description

The present invention relates to an anchor device for fixing a cylindrical tank to an installation location, and a construction method thereof.

Tanks that store liquids and powders are installed by fixing them with anchors at locations where foundation work has been done in advance. Among these tanks, most large tanks are cylindrical in order to prevent deformation due to the load of the contents. Large diameter tanks require a large number of anchors to be fixed, making construction difficult.

Conventional tanks are fixed in place using anchors, but in recent years, large tsunamis caused by large-scale earthquakes have caused the tanks to slip away from the anchors, float (pull out), and flow. ing. There is a need for an anchor structure and anchor construction method that can prevent the tank from being pulled out.

Embedded anchors and post-installed anchors are generally known as anchor construction methods for fixing the tank at the installation location. Among these, embedded anchors are stronger than post-installed anchors because the entire embedded part of the anchor bolt, which has the same length as the concrete thickness of the foundation slab layer that makes up the solid foundation structure at the installation site, is in contact with the concrete. excellent in terms of On the other hand, since anchors are installed and buried in advance during the foundation construction stage, construction must be carried out with high precision at the construction site, which limits the number of contractors, and the construction procedure is complex and costly.

The shapes of anchor bolts used for embedded anchors include hook type, hookless type, fixing plate type, etc. The pull-out strength is generally proportional to the surface area of the anchor bolt in contact with the concrete, and the deeper the anchor bolt is embedded and the larger the diameter of the anchor bolt, the larger the surface area in contact with the concrete and the higher the pull-out strength.

Generally, the embedded length of the anchor bolt is required to be about 35 to 40 times the diameter of the anchor bolt.If the embedded length is short, the anchor bolt will come off before reaching the specified proof strength, and the anchor bolt's original strength will be reduced. It is difficult to demonstrate strength and tenacity. In order to increase the pull-out strength, the tip of the anchor bolt is bent (hook type) or a plate is attached to the tip (fixing plate type).

There are two types of embedded anchor sets (anchor devices): fixed embedded type and movable embedded type. Among these, in the fixed embedded type, the anchor bolt is assembled into an anchor frame (anchor bolt fixing frame) and fixed, and the anchor frame is welded and fixed to fixed metal fittings such as anchor bolts on the concrete layer. This method ensures accuracy of installation dimensions and prevents anchor bolts from shifting due to concrete flow during concrete pouring of the foundation slab layer.

On the other hand, with the movable embedded type, a wrapper (funnel-shaped heat insulating material, etc.) called a box cutter is attached to the location where the anchor bolt is installed, and the wrapper is removed after the foundation slab layer is poured with concrete before the anchor bolt is installed. After pouring filled mortar and curing, the accuracy of the anchor bolt is measured and any dimensional errors are corrected. Note that the term "restoration" here refers to the work of adjusting the position of an anchor bolt by bending it when the anchor bolt exposed from the concrete is not in a predetermined position. This type of movable embedded type is a method that takes into account the need to reposition the anchor bolt, which leads to a decrease in tensile strength, and the disadvantage is that it requires prior consultation on the structural design, which is time-consuming.

All of the above-mentioned methods of fixing the tank at the installation location have problems in that the construction process is complicated and time-consuming, and requires advanced construction technology. For example, a tank installation device such as that disclosed in Patent Document 1 is known as a device that can be installed using a simple method when such a tank is fixedly installed at an installation location.

Registered utility model No. 3018298

However, the tank installation device disclosed in Patent Document 1 is for installing a domestic oil tank on the premises of a residence by a simple method, and requires constructing a solid foundation structure at the installation location. , cannot be used for installing tanks for industrial purposes, such as installing large-diameter tanks.
Therefore, there has been a need for an anchor device that can install a large-diameter tank in a simple process and has excellent pull-out resistance.

The present invention has been made in view of this background, and provides an anchor device for large-diameter tanks that allows installation of large-diameter tanks in a simple process and has excellent pull-out resistance, and this anchor device. The purpose is to provide a construction method.

In order to solve the above problems, the present invention proposes the following means.
That is, the anchor device of the present invention has a cylindrical structure attached to a solid foundation structure including a sacrificial concrete layer formed on the ground and a foundation slab layer having a main reinforcement structure formed on the sacrificial concrete layer. An anchor device for fixing a shaped tank, comprising an annular plate-shaped upper ring plate, an annular plate-shaped lower ring plate, and the upper ring plate and the lower ring plate facing each other with a predetermined distance maintained. an anchor frame having a stanchion member fastened in such a manner, a height adjustment member capable of adjusting the height position of the anchor frame with respect to the surface of the sacrificial concrete layer, and at least one of the upper ring plate and the lower ring plate. It is characterized by having an anchor bolt fixed to one side and a part buried in the solid foundation structure part.

According to the anchor device of the present invention, all that is required is to manufacture the anchor device at a factory, temporarily assemble it, check its dimensions, transport it to the tank installation site, adjust the height position, etc., and then pour concrete. For example, even a large anchor device for a large-diameter tank can be easily installed with fewer steps. Further, by embedding the anchor frame, which is a two-stage annular plate-shaped member consisting of an upper ring plate and a lower ring plate, in the base slab layer, an anchor device with excellent pull-out resistance can be realized.

Further, the present invention may further include a frame fixing member that is fixed to the sacrificial concrete layer and engaged with the height adjustment member.

Further, in the present invention, the upper ring plate can be divided into a plurality of upper ring plate division bodies, the upper ring plate division bodies are connected to each other via an upper joint plate, and the lower ring plate is The lower ring plate segment may be divided into a plurality of lower ring plate segments, and the lower ring plate segments may be connected to each other via a lower joint plate.

Further, in the present invention, the stanchion member may be formed with a flow opening that penetrates the concrete when concrete is placed in the foundation slab layer.

Further, in the present invention, one end of the anchor bolt buried in the foundation slab layer may be bent with respect to the vertical direction.

A method for constructing an anchor device according to the present invention is a method for constructing an anchor device using the anchor device described in each of the above items, the method comprising: fastening the upper ring plate and the lower ring plate via the stanchion member. After temporarily assembling the anchor frame, temporarily assembling the anchor device by temporarily fixing the height adjustment member to the stanchion member and the anchor bolt to the anchor frame; An installation step of installing the assembled anchor device on the sacrificial concrete layer at the installation location of the cylindrical tank, and operating the height adjustment member to adjust the upper surface of the upper ring plate to the surface of the foundation slab layer. a leveling step to match the position; a reinforcing step of arranging the main reinforcement structure on the top of the sacrificial concrete layer; and pouring concrete into a formwork formed to surround the anchor device. The present invention is characterized by comprising a concrete casting step of forming the foundation slab layer and fixing the anchor device.

As described above, the present invention provides an anchor device for a large-diameter tank that allows installation of a large-diameter tank in a simple process and has excellent pull-out resistance, and a construction method for this anchor device. Can be done.

FIG. 1 is an external perspective view showing an anchor device (installed state) according to an embodiment of the present invention. FIG. 2 is a sectional view perpendicular to the circumferential direction of the anchor device installed in the solid foundation structure. FIG. 3 is a plan view showing an upper ring plate and a lower ring plate that constitute the anchor device. FIG. 4 is a plan view showing one upper ring plate segment and one lower ring plate segment. FIG. 5 is a flowchart showing step-by-step the method for constructing the anchor device of this embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, the anchor device of one embodiment of this invention and the construction method using this anchor device are demonstrated in detail, referring drawings suitably. In the drawings used in the following explanation, characteristic parts of the present invention may be shown enlarged for convenience in order to make it easier to understand, and the dimensional ratio of each component may differ from the actual one. be. The materials, dimensions, etc. exemplified in the following description are merely examples, and the present invention is not limited thereto, and can be implemented with appropriate changes within the range that achieves its effects.

(Anchor device)
FIG. 1 is an external perspective view showing an anchor device (installed state) according to an embodiment of the present invention. FIG. 2 is a sectional view perpendicular to the circumferential direction of the anchor device installed in the solid foundation structure. FIG. 3 is a plan view showing an upper ring plate and a lower ring plate that constitute the anchor device. FIG. 4 is a plan view showing one upper ring plate segment and one lower ring plate segment.

First, a general solid foundation structure constructed at the installation site of a tank fixed by the anchor device of this embodiment will be described with reference to FIG. 2. The solid foundation structure 1 consists of a sacrificial concrete layer 2 formed on the ground at the installation location or on the ground dug to an arbitrary depth, and a main reinforcement structure 3 formed on the sacrificial concrete layer 2. A foundation slab layer 4 consisting of a reinforced concrete layer is provided. Moreover, a crushed stone layer (not shown) covered with crushed stones may be formed below the sacrificial concrete layer 2. Furthermore, a moisture-proof sheet (not shown) may be laid between the sacrificial concrete layer 2 and the foundation slab layer 4.

The tank fixed by the anchor device of this embodiment is a cylindrical tank, and is intended for installation of a large-diameter cylindrical tank with a diameter of, for example, 5 meters to 50 meters.

The anchor device 10 is installed in a flat foundation structure 1 constructed at a tank installation location, and as shown in FIG. It has at least an annular anchor frame 14, a height adjustment member 15, and a plurality of anchor bolts 16. Further, a frame fixing member 31 may be provided.
Almost all of the anchor device 10 is buried in the foundation slab layer 4 upon completion of construction.

The upper ring plate 11 is, for example, an annular plate-shaped member having an inner diameter larger than the diameter of the tank in which it is installed. The upper ring plate 11 is formed with a bolt hole 21 through which a bolt connected to a stanchion member 13 (to be described later) passes, and a bolt hole 25 through which an anchor bolt 16 passes.

A base plate 32 is fastened to the upper surface of the upper ring plate 11. The base plate 32 is welded at one end to the outer surface of the tank and is a connecting member that connects the tank to the anchor frame 14.

The lower ring plate 12 is, for example, an annular plate-shaped member having an inner diameter larger than the diameter of the tank in which it is installed. The lower ring plate 12 is formed with a bolt hole 23 through which a bolt connected to a stanchion member 13 (to be described later) passes, and a bolt hole 24 through which an anchor bolt 16 passes.

The stanchion member 13 is a member that fastens the upper ring plate 11 and the lower ring plate 12 so that they face each other with a predetermined distance therebetween. The stanchion member 13 is fastened to the upper ring plate 11 and the lower ring plate 12 with bolts, respectively.

By fastening the upper ring plate 11 and the lower ring plate 12, these plurality of stanchion members 13 form a highly rigid anchor frame 14 having a two-stage structure of annular plates. Furthermore, the stanchion member 13 also makes the relative positional relationship between the plurality of anchor bolts 16 constant.

Further, each stanchion member 13 is formed with a bolt hole through which a stud bolt 15a constituting the height adjustment member 15 passes, and functions as a mounting base for the height adjustment member 15.

The stanchion member 13 is formed so that its lower side in contact with the lower ring plate 12 is wider than its upper side in contact with the upper ring plate 11. In this manner, by making the lower width of the stanchion member 13 larger than the upper width, the anchor frame 14 can be assembled more stably and easily when temporarily assembling the anchor device 10.

Further, when one end of the anchor bolt 16 (described later) is bent toward the outside of the anchor frame 14, torsional stress is generated in the anchor frame 14, but the width of the lower side of the stanchion member 13 in contact with the lower ring plate 12 is Such stress can be relieved by widening the spacing between the stud bolts 15a that constitute the height adjusting member 15.

It is preferable that such a plurality of stanchion members 13 be attached so as to be inclined at an arbitrary angle with respect to the direction in which the upper ring plate 11 and the lower ring plate 12 spread from the center. Moreover, it is preferable that the stanchion members 13 adjacent to each other in the circumferential direction are arranged in directions that intersect with each other. By arranging the stanchion members 13 in this manner, it is possible to improve assembly stability when assembling the anchor frame 14.

Further, each stanchion member 13 has a flow opening 26 formed therein. These flow openings 26 allow concrete to flow through during concrete pouring of the foundation slab layer 4. Thereby, when the concrete hardens and the foundation slab layer 4 is formed, the stanchion member 13 can be more firmly fixed inside the foundation slab layer 4. In this embodiment, semicircular openings are formed as the flow openings 26 on the upper ring plate 11 side and the lower ring plate 12 side, respectively.

The anchor frame 14 of this embodiment, which includes the upper ring plate 11, the lower ring plate 12, and the stanchion member 13, is configured to be divisible into a plurality of divided bodies. For example, as shown in FIG. 4, the upper ring plate 11 is composed of six divided bodies (upper ring plate divided bodies) 11a that can be divided into six in the circumferential direction. Similarly, the lower ring plate 12 is composed of six divided bodies (lower ring plate divided bodies) 12a that can be divided into six in the circumferential direction.

Furthermore, a joint plate (upper joint plate) 18 is formed at the end of the divided bodies 11a of the upper ring plate 11 arranged adjacent to each other to connect these divided bodies 11a. Similarly, a joint plate (lower joint plate) 19 is formed at the end of the divided bodies 12a of the lower ring plate 12 arranged adjacent to each other to connect these divided bodies 12a.

With such a divided structure of the upper ring plate 11 and the lower ring plate 12, the anchor frame 14 can be divided into six equal angles along the circumferential direction, for example. As a result, even if the anchor frame 14 has a diameter of several tens of meters, for example, and is difficult to transport in its original form, it is possible to temporarily assemble the entire anchor frame 14 at a factory or the like, and then create a size that can be transported. By dividing the anchor device 10 into a plurality of divided bodies, transporting it to a tank installation location, and connecting the divided bodies again, it is possible to easily install a large-sized anchor device 10.

The height adjusting member 15 is arranged so that the upper surface of the anchor frame 14, that is, the upper surface of the upper ring plate 11 is in a position that matches the upper surface of the foundation slab layer 4 after formation. This is a member that adjusts the height position arbitrarily. In the present embodiment, the height adjustment member 15 includes a long stud bolt 15a that is a headless bolt, and a nut 15b that is screwed onto the stud bolt.

The height adjustment member 15 is attached to the lower part of the anchor frame 14 by passing a stud bolt 15a through a bolt hole of the stanchion member 13 and tightening it with a nut 15b. Further, by adjusting the position of the stud bolt 15a with respect to the lower ring plate 12, the height position of the anchor frame 14 can be adjusted to an arbitrary height. By mutually adjusting the plurality of height adjusting members 15, it is possible to level the upper ring plate 11 by making the upper surface of the upper ring plate 11 horizontal.

Such a height adjustment member 15 can be attached (temporarily assembled) to the anchor frame 14 in advance at a factory or the like, so that the height position of the anchor frame 14 can be adjusted after the anchor device 10 is transported and installed at the installation site. Make it easy and adjustable. The bolt hole through which the stud bolt 15a constituting the height adjustment member 15 is passed may be a round hole or an elongated hole whose fastening position can be adjusted.

By using such a plurality of height adjustment members 15, the stud bolts 15a and the anchor frame 14 are fastened at a plurality of locations, and the stud bolts 15a forming the legs that support the anchor frame 14 can be made more rigid.

The anchor device 10 of this embodiment may further include a frame fixing member 31. The frame fixing member 31 is welded to a fixed anchor 31a formed in the sacrificial concrete layer 2, and is also welded to a stud bolt 15a forming the height adjustment member 15. That is, the frame fixing member 31 is a member that fixes the height adjusting member 15 to the concrete layer 2. By using such a frame fixing member 31, the anchor device 10 installed on the sacrificial concrete layer 2 can be fixed to the sacrificial concrete layer 2 without shifting its position.

The anchor bolts 16 are bolts for firmly anchoring the anchor frame 14 to the foundation slab layer 4, and are bolts of a predetermined length in order to secure a surface in contact with the concrete that constitutes the foundation slab layer 4. is required. If such an anchor bolt 16 needs to be lengthened, if it is extended in the vertical direction, the thickness of the foundation slab layer 4 will need to be increased unnecessarily, so the anchor bolt 16 of this embodiment is By bending and extending the base slab layer 4 in the direction, the required length is ensured without making the thickness of the base slab layer 4 unnecessarily thick.

Note that the bent portions of the plurality of anchor bolts 16 in this embodiment are provided so as to extend along the radial direction extending from the center of the upper ring plate 11 and the lower ring plate 12.

Furthermore, a plate-like member such as a fixing plate (not shown) may be further attached to the tip end portion of the anchor bolt 16. By providing such a fixing plate, the pull-out resistance of the anchor bolt 16 can be improved.

(Construction method of anchor device)
Next, a method of constructing the anchor device of the embodiment described above will be explained.
FIG. 5 is a flowchart showing step-by-step the method for constructing the anchor device of this embodiment.
The construction method of the anchor device of this embodiment includes a temporary assembly step S1 in which the anchor device 10 is temporarily assembled in a factory or the like, a transportation step S2 in which the temporarily assembled anchor device 10 is transported to the installation location of the cylindrical tank, and a temporary assembly step S1 in which the anchor device 10 is temporarily assembled in a factory or the like. An installation step S3 in which the assembled anchor device 10 is installed on the concrete layer 2 at the installation location of the tank, a leveling step S4 in which the upper surface of the upper ring plate is matched with the planned surface position of the foundation slab layer 4, and The method includes a reinforcing step S5 of arranging the main reinforcement structure 3 on the upper part of the concrete layer 2, and a concrete placing step S6 of forming the foundation slab layer 4 and fixing the anchor device 10.

"Temporary assembly process S1"
First, for example, in a factory with sufficient space, the upper ring plate 11 and the lower ring plate 12, which are the components of the anchor device 10 manufactured in advance, are connected using bolts via the stanchion member 13. to temporarily assemble the anchor frame 14.

More specifically, first, one end side of the stanchion member 13 is temporarily fastened with a bolt to each of the divided bodies 12a, 12a, which are obtained by dividing the lower ring plate 12 into six, for example, and the divided bodies 12a of the lower ring plate 12 are A plurality of stanchion members 13 are erected at predetermined positions.

Next, the upper ring plate 11 is divided into six parts 11a, each of which is jacked up, placed on the other end side of the plurality of stanchion members 13 erected on the lower ring plate 12, and the upper ring plate 11 is The divided body 11a of the plate 11 is temporarily fastened to the other end side of the plurality of stanchion members 13 using bolts. As a result, the anchor frame 14 is temporarily assembled.

Next, the stud bolts 15a and nuts 15b constituting the height adjustment member 15 are temporarily fastened to the stanchion member 13 by jacking up each segment of the anchor frame 14 thus temporarily assembled. During this temporary fixing, there is no need to position the height of the anchor frame 14 using the height adjustment member 15.

Further, an anchor bolt 16 having a bent tip is passed through the bolt hole 25 of the upper ring plate 11 and the bolt hole 24 of the lower ring plate 12, and is temporarily fixed with the bolt. Through the above steps, the temporarily assembled divided bodies (six divisions) of the anchor device 10 are obtained.

In addition, in the temporary assembly step S1, the temporarily assembled anchor device 10 may be divided into an optimal number depending on the conveying means. For example, in the anchor device 10 used for fixing a tank with a relatively small diameter, the annular anchor device 10 may be divided into two or three parts, and in the case of a cylindrical tank with a very large diameter, for example, The number of divisions is not limited, and it may be divided into a larger number of divisions, such as 8 divisions or 10 divisions. Further, if transport is possible, the joint plates 18 and 19 may be temporarily fixed, and the anchor device 10 temporarily assembled in an annular shape may be transported.

"Transportation process S2"
In the transport step S2, a plurality of divided bodies of the anchor device 10, which are divided into transportable sizes, are transported to the installation location of the cylindrical tank according to the transport means. The transportation means can be any transportation method such as a truck or a ship. If transport is possible, the joint plates 18 and 19 may be temporarily fixed in the pre-assembly step S1, and the anchor device 10 temporarily assembled in an annular shape may be transported. Furthermore, it is preferable that the divided bodies of the anchor device 10 to be transported be cured during transport by covering the periphery with a buffer sheet or the like.

"Installation process S3"
Next, the temporarily assembled divided pieces of the anchor device 10, which have been transported to the tank installation location by the transportation means, are placed on the sacrificial concrete layer 2 that has been formed in advance at the tank installation location. When mounting, the divided body of the anchor device 10 is placed on the concrete layer 2 so that the stud bolts 15a of the height adjustment member 15 are in contact with the concrete layer 2 as the legs of the anchor frame 14, and the overall shape is annular. All you have to do is line them up.

Then, the ends of the divided bodies 11a of the upper ring plate 11 constituting the divided bodies of the anchor device 10 are connected together by a joint plate 18, and the ends of the divided bodies 12a of the lower ring plate 12 are connected together by a joint plate 19. They are connected to assemble an annular anchor device 10.

In addition, when using the frame fixing member 31 when installing the anchor device 10, the fixed anchor 31a is discarded in advance and driven into the concrete layer 2, and the frame fixing member 31 is welded to this fixed anchor 31a, so that temporary assembly can be performed. The anchor device 10 is more firmly fixed to the concrete layer 2 without shifting its position.

"Leveling process S4"
Next, after adjusting the diameters of the upper ring plate 11 and lower ring plate 12 of the temporarily assembled anchor device 10, the joint plates 18 and 19 are fastened.
In addition, the upper ring plate 11 is jacked up and adjusted to a horizontal position, and a plurality of height adjustment members are used to adjust the upper ring plate 11 so that the upper surface of the upper ring plate 11 matches the planned surface position of the foundation slab layer 4. The positions of the 15 stud bolts 15a are adjusted and fixed using nuts 15b. As described above, the anchor device 10 is installed at a predetermined position on the sacrificial concrete layer 2.

"Reinforcement arrangement process S5"
Next, the main reinforcement structure portion 3 is arranged within the area where the base slab layer 4 is planned to be formed. The main reinforcements forming the main reinforcement structure 3 may be arranged, for example, so as to penetrate the anchor device 10 without contacting it.

"Concrete placement process S6"
Next, a formwork for concrete placement is installed so as to surround the anchor device 10 fixed on the sacrificial concrete layer 2. Then, concrete that will become the foundation slab layer 4 is poured inside this formwork.

When pouring concrete, the flow openings 26 formed in the stanchion member 13 are made to penetrate through the concrete. Thereby, when the concrete hardens and the foundation slab layer 4 is formed, the entire anchor device 10 can be firmly fixed inside the foundation slab layer 4.

Through the above steps, the anchor device of this embodiment is installed at the installation location of the cylindrical tank. Thereafter, after the poured concrete hardens and the foundation slab layer 4 in which the anchor device 10 is buried is completed, the outer surface of the tank is welded to the base plate 32 fastened to the upper surface of the upper ring plate 11. can be fixed at a predetermined position and at a predetermined height.

As described above, according to the method for constructing an anchor device according to the present embodiment, the anchor device 10 is manufactured in parts, temporarily assembled, and dimensions are checked in a factory or the like, and after being transported as a divided body to the tank installation site, the anchor device 10 is Even large anchor devices can be easily installed in a few steps by simply adjusting the position and pouring concrete.

(1) In the conventional anchor set construction method for column bases, the anchor frame and anchor bolts are delivered as parts and assembled on site, but when applied to large-diameter, circular anchor sets, it is completely impractical when the number of anchor bolts is large. Not the point. On the other hand, in the anchor device 10 of the present embodiment, the anchor bolts 16 are assembled into the anchor frame 14 during manufacturing at a factory or the like, thereby eliminating the complicated installation work of numerous anchor bolts at the tank installation site. Can be done.

(2) In this embodiment, the divided bodies of the anchor frame 14 are temporarily assembled in advance in a factory or the like, so even if there are restrictions such as the installation location, two divided bodies of the anchor frame 14 manufactured separately can be assembled together. ~If you can temporarily assemble every few pieces, most accuracy issues can be solved. In addition, since the anchor device 10 is manufactured in parts within a size that can be transported, the anchor device 10 can be easily manufactured even for a large cylindrical tank having a diameter of, for example, 100 m. As a result, even a smaller-scale construction company can construct an anchor device for a large-diameter tank, which could previously only be manufactured by a limited number of major construction companies.

(3) The anchor device 10 of this embodiment has an anchor frame 14 with a double ring structure in which an annular upper ring plate 11 and a lower ring plate 12 are joined via a stanchion member 13, so it has excellent rigidity. It has a structure that releases pressure during concrete pouring, and can fix the anchor bolt 16 that can withstand concrete pouring, which is highly difficult to perform. Therefore, the anchor device 10 for a large-diameter tank can be sufficiently constructed with ordinary construction skills without using special techniques.

(4) The anchor device 10 of the present embodiment is constructed by assembling the divided parts of the large-diameter anchor frame 14 at the installation site and adjusting the installation height position etc. using the height adjustment member 15. The accuracy of the installation position of the anchor frame 14 including the plate 11 and the lower ring plate 12 can be ensured. That is, the upper surface of the upper ring plate 11 directly becomes a flat liner surface, which can be used as the installation surface of the base plate 32. Furthermore, since the base plate 32 can be set without having to individually adjust it, it is much easier to ensure construction accuracy, work efficiency is increased, and the number of work steps at the installation site can be significantly reduced.

Although one embodiment of the anchor device of the present invention and its construction method has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. This embodiment and its modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

1... Solid foundation structure part 2... Discarded concrete layer 3... Main reinforcement structure part 4... Foundation slab layer 10... Anchor device 11... Upper ring plate 12... Lower ring plate 13... Stansion member 15... Height adjustment member 16... Anchor bolt 31 …Frame fixing member

Claims (6)

An anchor device for fixing a cylindrical tank to a solid foundation structure comprising a sacrificial concrete layer formed on the ground and a foundation slab layer having a main reinforcement structure formed on the sacrificial concrete layer. And,
An anchor frame having an annular plate-shaped upper ring plate, an annular plate-shaped lower ring plate, and a stanchion member that fastens the upper ring plate and the lower ring plate so as to face each other at a predetermined distance;
a height adjustment member capable of adjusting the height position of the anchor frame with respect to the surface of the sacrificial concrete layer;
An anchor device comprising: an anchor bolt fixed to at least one of the upper ring plate or the lower ring plate and partially embedded in the solid foundation structure. The anchor device according to claim 1, further comprising a frame fixing member fixed to the sacrificial concrete layer and engaged with the height adjusting member. The upper ring plate can be divided into a plurality of upper ring plate division bodies, and the upper ring plate division bodies are connected to each other via an upper joint plate,
Further, the lower ring plate can be divided into a plurality of lower ring plate segments, and the lower ring plate segments are connected to each other via a lower joint plate. Anchor device. The anchor device according to any one of claims 1 to 3, wherein the stanchion member is formed with a flow opening that penetrates concrete when concrete is placed in the foundation slab layer. The anchor device according to any one of claims 1 to 4, wherein the anchor bolt has one end buried in the foundation slab layer bent with respect to the vertical direction. A method for constructing an anchor device using the anchor device according to any one of claims 1 to 5,
After temporarily assembling the anchor frame by fastening the upper ring plate and the lower ring plate via the stanchion member, the height adjusting member is attached to the stanchion member, and the anchor bolt is attached to the anchor frame. , a temporary assembly step of temporarily fixing each and temporarily assembling the anchor device;
an installation step of installing the temporarily assembled anchor device on the sacrificial concrete layer at the installation location of the cylindrical tank;
a leveling step of operating the height adjustment member to align the upper surface of the upper ring plate with the planned surface position of the base slab layer;
a reinforcing step of arranging a main reinforcement structure section on the top of the sacrificial concrete layer;
The present invention is characterized by comprising the step of pouring concrete into a formwork formed to surround the anchor device, forming the foundation slab layer, and fixing the anchor device. Construction method of anchor device.

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