JPH06207478A - Composite structure storage tank of steel plate with concrete body and its construction method - Google Patents

Abstract

PURPOSE:To secure the air- and liquid-tightness of an entire storage tank by forming a steel horizontal ring at the top of side wall of a storage tank main body, attaching a flexible membrane body on the horizontal ring, applying air pressure to the inside of it, and constructing a roof on the outer surface of it. CONSTITUTION:At least the upper part of side walls 3 of a storage tank main body 1 is formed of steel plates to form a steel horizontal ring 4 at the upper part of the side walls 3. Next the membrane body attaching part of the horizontal ring 4 is connected to the horizontal ring attaching part of a flexible membrane body 9 which covers the upper part of the storage tank main body 1 to attach the flexible membrane body 9 to the horizontal ring 4. Then, air pressure is applied to the inside of the flexible membrane body 9, and a roof 5 of concrete structure body is constructed on the outer surface of it. Thus not only the intrusion of rain water from the roof 5 and leakage of vapor of stored liquid can be cut off but also the sealing property of the entire storage tank can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage tank for storing liquid, low temperature liquefied gas, powder, granular material, etc.
The present invention relates to a storage tank having a composite structure in which a storage tank main body composed of a bottom wall and a side wall is formed of at least a steel plate at an upper portion of the side wall thereof, and a roof is formed of a concrete structure. The present invention relates to a method for constructing a composite structure storage tank formed by using.

[0002]

2. Description of the Related Art A conventional steel storage tank, for example, as shown in FIG. 5, has a bottomed cylindrical storage tank body 201 composed of a bottom wall 202 and a side wall 203, and a roof plate 207 covering the storage tank body 201. Domed roof 205 consisting of roof bone 206
Was attached and formed, and it was formed of a steel structure made entirely of steel. Further, in a conventional concrete storage tank, for example, as shown in FIG. 6, a dome-shaped roof 215 that covers the storage tank main body 211 upper part is attached to the top of the bottomed cylindrical storage main body 211 composed of a bottom wall 212 and a side wall 213. It was formed by a concrete structure made entirely of concrete.

Further, a construction method for forming a roof of a concrete structure using a flexible film body to which air pressure is applied is, for example,
The attachment part of the peripheral edge of the flexible membrane that covers the upper part of the structure such as the storage tank is airtightly fixed to the attachment part such as the anchor bolt at the upper end of the concrete side wall, and the flexible membrane is stretched by air pressure from below and the membrane is attached. A construction method for forming a roof of a dome-shaped concrete structure by placing concrete on it is disclosed in Japanese Patent Laid-Open No. 4-111.
872 and Japanese Patent Laid-Open No. 4-202976 have been introduced as inventions by the present applicants.

According to the prior arts of these inventions, an embedded anchor bolt projecting from the upper end of the side wall is connected to a reinforcing bar in a concrete side wall, and a mounting hole of a mounting portion at the periphery of the flexible membrane is fitted and fixed with a nut. Alternatively, the flexible film body is attached to the upper part of the side wall by using a fixing means such as embedding and fixing the mounting portion of the peripheral edge of the flexible film body directly in the concrete structure of the side wall, and the flexible film body is stretched by air pressure. After placing reinforcing materials such as reinforcing bars connected to the reinforcing bars in the upper part of the side wall on the entire upper surface of
Formed the roof of the concrete structure.

[0005]

In the conventional steel storage tank, the entire storage tank is relatively light because not only the storage tank main body but also the roof is formed of a steel structure using high-strength steel. If rainwater etc. stays around the storage tank when the storage liquid is empty,
There is a problem that the whole tank floats in the water,
When a pressure is applied to the inside of the storage tank having a diameter larger than the height of the storage tank, the pressure causes the outer peripheral edge of the lower portion of the storage tank to float, which causes a problem of uplift.

Further, in the conventional concrete storage tank, since the heavy roof of the concrete structure acts to push horizontally the upper part of the side wall of the concrete structure, which is weak against tensile force, cracks occur at the joint between the side wall and the roof. It is also easy to cause the problem of waiting for the construction work of the roof to start until the side wall of the concrete structure develops concrete strength, and the problem of cracking or poor connection between the side wall and the concrete joint of the roof. As a result, there has been a problem that the airtightness and the liquidtightness at the joint between the side wall and the roof become incomplete.

Further, in the roof construction method introduced in Japanese Patent Application Laid-Open Nos. 4-111872 and 4-202976, when the embedded anchor bolts are used as the fixing means for the flexible membrane, the structure of the concrete structure is It is difficult to plant a large number of embedded anchor bolts around the entire upper edge of the side wall at a fixed pitch, and it is troublesome to fit the mounting holes of the flexible membrane assembly into the embedded embedded anchor bolts. In addition, in the case where the mounting portion on the peripheral edge of the flexible membrane is directly embedded and fixed in the concrete structure of the side wall, the mounting portion of the flexible membrane is fixed so that it does not move until the strength of the concrete structure to be embedded and fixed appears. The work of curing the flexible film is difficult, and any work to attach the flexible film is not easy. In addition, reinforcements such as reinforcing bars and sidewalls are installed on the entire upper surface of the flexible film stretched by air pressure. Operation of connecting the parts of the reinforcing bars were also complicated the task of connecting to the alignment.

The present invention has been made in view of the above-mentioned problems, and combines the advantages of a steel storage tank and the advantages of a concrete storage tank, resulting in good overall durability and workability, and is economically superior. Storage tank formed by combining a steel structure and a concrete structure to form a storage tank, and as a method for constructing the storage tank, a steel plate is used to form the roof of the concrete structure using a flexible film body to which air pressure is applied. The present invention provides a method for constructing a composite structure storage tank of concrete bodies.

[0009]

In order to solve the above-mentioned problems, a composite structure storage tank of a steel plate and a concrete body according to the present invention has at least an upper side wall of a storage tank body formed of a steel plate, and a horizontal steel plate is formed on the upper side wall. A ring is formed to form a roof of a concrete structure connected to the horizontal ring.

Further, at least the upper part of the side wall of the storage tank body is formed of a steel plate, a horizontal steel ring is formed on the upper side wall, and a flexible film body is fixed to the horizontal ring so as to cover the upper part of the storage tank body. A roof of a concrete structure connected to the horizontal ring is formed on the outer surface of the flexible membrane to form a composite structure storage tank of a steel plate and a concrete body.

Further, at least the upper part of the side wall of the storage tank main body is formed of a steel plate, and a horizontal steel ring is formed on the upper side wall of the storage tank body. The flexible film body is attached to the horizontal ring by joining the ring attachment portion, and air pressure is applied to the inner surface of the flexible film body,
It is a method for constructing a composite structure storage tank of the above steel plate and concrete body, which is performed by forming a roof of a concrete structure on the outer surface of the flexible membrane body to which the air pressure is applied.

[0012]

[Operation] At least the upper part of the side wall of the storage tank body is made of steel plate,
A composite structure storage tank with a steel horizontal ring formed on the upper part of the side wall and a concrete structure roof connecting to the horizontal ring has a heavy concrete structure roof with the bottom wall of the storage tank main body and the steel plate side wall facing up. Even if rainwater, etc. stays around the storage tank, the storage tank will not float due to buoyancy, and even if pressure is applied to the inside of the storage tank, the outer peripheral edge of the lower part of the storage tank will be lifted up. Nor. Also, even if a heavy concrete structure roof is installed on the side wall, the heavy roof will push the side wall upper part horizontally to connect the roof to the steel plate upper side wall through the high strength steel horizontal ring. The steel horizontal ring suppresses the thrust force, and the side wall and the horizontal ring are strong homogeneous metal bonds, so the heavy roof does not crack at the joint between the side wall and the roof like a concrete storage tank, and the horizontal ring Firmly joins the side wall and the roof airtightly and liquid-tightly, and even when constructing the roof, it is not necessary to wait for the strength of the concrete structure of the side wall to develop, and it is possible to construct the roof immediately after forming the steel side wall. You can start.

Further, a steel horizontal ring is formed on the upper side wall of the steel, and a flexible film body is fixed to the horizontal ring to cover the upper part of the storage tank main body, and the horizontal ring is provided on the outer surface of the flexible film body. The composite structure storage tank that forms the roof of the concrete structure that is connected to the flexible membrane is made of steel in addition to blocking the infiltration of rainwater and the leakage of liquid vapor from the roof formed of the concrete structure. It can be connected airtightly and liquid-tightly to the horizontal ring of, and also in series with the side wall and bottom wall made of steel with a sealing property, and functions as a sealing layer for the whole storage tank, so that only the joint between the roof and the side wall Therefore, the airtightness and the liquidtightness of the entire storage tank can be improved.

Furthermore, the flexible film body is attached to the steel horizontal ring by joining the film body attachment portion of the steel horizontal ring and the horizontal ring attachment portion of the flexible film body that covers the upper portion of the storage tank body. The construction method of applying a pneumatic pressure to the inner surface of the flexible film body and forming the roof of the concrete structure on the outer surface of the flexible film body to which the air pressure is applied to construct a composite structure storage tank of a steel plate and a concrete body,
In addition to being able to use a flexible membrane to which air pressure has been applied as a formwork or scaffold, for example, anchor bolts for the horizontal ring membrane attachment part can be worked without having to consider the reinforcing bars in the side wall like concrete storage tanks. In addition, since it is also possible to directly implant the anchor bolts on the steel horizontal ring afterwards by stud welding etc. in accordance with the mounting holes of the flexible film horizontal ring mounting portion, both of them can be flexed in the fixing means. Not only is the installation work of the membrane easy, but it is not necessary to align the reinforcements such as reinforcing bars arranged on the roof of the concrete structure, taking into consideration the reinforcing bars in the side walls like concrete storage tanks. Since it can be connected to a steel horizontal ring, its work is extremely easy. Further, the horizontal ring can also be used as a formwork for preventing falling by damming concrete to be poured for forming a roof.

[0015]

Embodiments will be described with reference to the drawings. FIG. 1 is a side sectional explanatory view showing an embodiment of a composite structure storage tank of a steel plate and a concrete body according to the present invention, and FIG. 2 is a side sectional explanatory view showing a construction method for forming a roof of the storage tank. . First,
In the figure, reference numeral 1 is a storage tank main body composed of a disk-shaped bottom wall 2 and a cylindrical side wall 3, and is formed of a liquid-tight or air-tight steel structure suitable for storage by using a steel plate or a shaped steel. On the upper part of the side wall 3 of the storage tank main body 1, a horizontal ring 4 in which an end edge of an annular flat plate is bent upward and reinforced like a gutter is formed and attached by a shaped steel or a steel plate, and the upper part of the storage tank main body 1 is covered. A dome-shaped roof 5 of concrete structure is connected to the horizontal ring 4 to form an overall composite steel tank with concrete structure.

The composite structure storage tank thus formed has a roof of concrete structure 5 even if a fire occurs near the storage tank.
Acts as a fire-resistant structure, protecting the storage tank from fire.

Also, the roof 5 of this concrete structure
Is a film body mounting portion (not shown) formed on the horizontal ring 4 on the side wall 3 of the storage tank body 1 and a horizontal ring mounting portion (not shown) formed on the periphery of the flexible film body 9 covering the upper portion of the storage tank body 1.
And the flexible membrane 9 is attached to the horizontal ring 4 in an airtight manner, and air is blown from the blower 10 into the storage tank body 1 to which the flexible membrane 9 is attached to form the roof 5 of the concrete structure. The flexible film body 9 is inflated in a dome shape by applying necessary air pressure, and a reinforcing member 6 such as a reinforcing bar having an end connected to the horizontal ring 4 is provided on the entire upper surface of the inflated flexible film body 9. , Placing concrete with the bulging flexible membrane 9 as a formwork,
It is formed on the roof 5 of the concrete structure.

The roof 5 of the concrete structure thus formed can be easily attached to the existing open-top steel storage tank without a roof by attaching the horizontal ring 4 to the roof of the existing steel storage tank. It can also be used for renovation. The flexible film body 9 used for constructing the roof 5 of the concrete structure is formed of an airtight and high-tensile cloth or a metal film. The flexible film body 9 may be removed after the roof 5 is constructed and diverted to another construction, but it is attached as it is and used as a permanent rainwater intrusion prevention layer or a liquid storage vapor leakage prevention layer.

The horizontal ring 4 is formed in a gutter shape by bending both inner and outer ends of an annular flat plate upward in the figure.
It is possible to receive the thrust force from the heavy roof 5 and to attach the flexible film body 9 and the reinforcing member 6 conveniently, and to form the concrete so that it can be prevented from falling.
The outer end is bent upward and the inner end remains horizontal, or the outer end is bent upward and the inner end is bent downward.

Although not shown in detail, the film body attachment portion formed on the horizontal ring 4 is formed, for example, in such a manner that it can be airtightly joined to the horizontal ring attachment portion formed on the peripheral edge of the flexible film body 9. Bolts are attached by welding in advance over the entire circumference of the horizontal ring 4 in accordance with the mounting hole pitch of the horizontal ring mounting portion of the flexible film body 9, or the flexible film body 9 is brought into contact with the horizontal ring 4. It is formed by directly attaching bolts to the horizontal ring 4 in accordance with the attachment holes of the horizontal ring attachment portion of the flexible film body 9, or by providing an engaging piece or an opening hole for engagement.

Further, although not shown, the horizontal ring mounting portion formed on the periphery of the flexible film body 9 has a separation pitch so that the horizontal ring mounting portion can be hermetically bonded to the film body mounting portion formed on the horizontal ring 4. A horizontal ring mounting portion is provided by providing a mounting hole, an engaging piece, and the like. As described above, the film body mounting portion of the horizontal ring 4 and the horizontal ring mounting portion of the flexible film body 9 are formed. For example, the bolt of the film body mounting portion of the horizontal ring 4 is used to horizontally mount the flexible film body 9. The film mounting portion and the horizontal ring mounting portion are airtightly joined together by fitting the mounting holes of the ring mounting portion and biting the sealing material or the like with the nuts.

The horizontal ring 4 can be manufactured and constructed on site, but if it is prefabricated as a unit with the membrane attachment portion in the factory and assembled and welded on site, the membrane attachment portion etc. Since it is not necessary to perform dimensioning and size matching, the assembling accuracy is improved, and the assembling work at the site is facilitated.

Although the detailed view of the end of the reinforcing member 6 such as a reinforcing bar disposed in the roof 5 of the concrete structure is omitted, it may be directly welded to the upper surface of the horizontal steel ring 4. , The side wall 3, the horizontal ring 4, and the roof 5 are formed to be an integrated structural storage tank having a strong binding force. In addition, if necessary, the horizontal ring 4
To form a support member 7 for supporting the lower part of the horizontal ring 4,
In order to prevent the side wall 3 from buckling, the reinforcing ring 8 is formed by being wound around the inner surface or the outer surface of the side wall 3.

FIGS. 3 and 4 show a composite structure storage tank of steel plate and concrete showing the second and third embodiments of the present invention. In FIG. 3, 101 is a storage tank main body composed of a bottom wall 102 of a concrete structure and a side wall 103 made of steel plate, 104 is a horizontal steel ring, and 105 is a roof of the concrete structure. In the second embodiment of FIG. 3, the bottom wall 10
The bottom wall 102 is formed of a concrete structure so that there is no problem of corrosion of No. 2 and the bottom is stable and strong.

Further, in FIG. 4, 111 is a storage tank main body composed of a bottom wall 112 of a concrete structure and a side wall 113 having a steel plate for the ground portion and a concrete structure for the underground portion, and 114 is a horizontal steel ring. , 115 are roofs of concrete structures. In the third embodiment of FIG. 4,
The storage tank body 1 has good stability, is strong against earthquakes and winds, is strong against storage liquid pressure and earth pressure, and has good durability and corrosion resistance.
The side wall of 11 underground parts is formed in the concrete structure, and the whole storage tank is formed in the semi-underground type.

[0026]

EFFECT OF THE INVENTION The composite structure storage tank of steel plate and concrete body according to the present invention is a concrete structure in which at least the upper side wall of the storage tank main body is formed of a steel plate, a horizontal steel ring is formed on the upper side wall, and the horizontal ring is connected to the horizontal ring. Since the roof of the structure is formed, the roof of the heavy concrete structure firmly holds down the bottom wall of the tank body and the side wall made of steel plate from above, so even if rainwater etc. stays around the tank, It is safe because it does not float up, and it is safe because the outer peripheral edge of the lower part of the storage tank does not lift even if pressure is applied to the inside of the storage tank.
In addition to being a safe storage tank in the event of an abnormality, this storage tank is made of steel with a high-strength steel horizontal ring, even if a roof of heavy concrete structure with fireproof structure is formed on the top of the storage tank main body. Since it is firmly connected to the upper part of the side wall of the concrete, it can be a storage tank with excellent durability that does not crack at the joint between the side wall and the roof, and the construction work of the concrete structure roof is awaited. It can be done smoothly and the construction period of the storage tank can be shortened.

Further, at least the upper part of the side wall is formed of a steel plate, a horizontal ring made of steel is formed on the upper part of the side wall, and a flexible film body for fixing the periphery of the horizontal ring to cover the upper part of the storage tank main body is provided. The composite structure storage tank in which the roof of the concrete structure that is connected to the horizontal ring is formed on the outer surface of the membrane is not only capable of blocking rainwater infiltration and storage vapor leak of the flexible membrane roof formed of the concrete structure. The flexible membrane and the horizontal steel ring can be connected air-tightly and liquid-tightly, and the side walls and bottom wall made of steel with a sealing property are also connected in series to function as a sealing layer for the entire storage tank. It is possible to form a safe and highly functional storage tank having excellent air-tightness and liquid-tightness as well as the connecting portion between the side wall and the side wall.

Furthermore, the flexible membrane body is attached to the steel horizontal ring by joining the membrane body attachment portion of the steel horizontal ring and the horizontal ring attachment portion of the flexible membrane body that covers the upper part of the storage tank body. Air pressure is applied to the inner surface of the flexible membrane, and the roof of the concrete structure is formed on the outer surface of the flexible membrane to which the air pressure is applied.The construction method of the composite structure storage tank of steel plate and concrete body is
Since a flexible membrane that is pressurized with air can be used as a formwork or scaffold, it is a safe construction method, and temporary construction costs can be greatly reduced, and the membrane attachment part of the horizontal ring is easy to form and the horizontal ring The joint between the membrane attachment part and the horizontal ring attachment part of the flexible membrane can be fixed after they have been joined. Since it is easy to attach a reinforcing material such as a reinforcing bar to be arranged, the workability is good, the construction period of the storage tank can be shortened, and the storage tank can be economically constructed.

[0029]

[Brief description of drawings]

FIG. 1 is an explanatory side sectional view showing an embodiment of a composite structure storage tank of a steel plate and a concrete body according to the present invention.

FIG. 2 is a side sectional explanatory view showing a construction method for constructing the roof of the composite structure storage tank according to the present invention.

FIG. 3 is a side cross-sectional explanatory view of a composite structure storage tank showing a second embodiment according to the present invention.

FIG. 4 is a side cross-sectional explanatory view of a composite structure storage tank showing a third embodiment according to the present invention.

FIG. 5 is a side cross-sectional explanatory view of a conventional steel storage tank.

FIG. 6 is a side cross-sectional explanatory view of a conventional concrete storage tank.

[Explanation of symbols]

1, 101, 111, 201, 211 Storage tank body 2, 102, 112, 202, 212 Bottom wall 3, 103, 113, 203, 213 Side wall 4, 104, 114 Horizontal ring 5, 105, 115, 205, 215 Roof 6 Reinforcement material 7 Support material 8 Reinforcement ring 9 Flexible membrane body 10 Blower facility 206
Roof bone 207
Shingles

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Wada 4-2-11, Ginza, Chuo-ku, Tokyo Inside Ishii Iron Works Co., Ltd.

Claims (3)

[Claims] 1. A steel plate characterized in that at least an upper side wall of a storage tank main body is formed of a steel plate, a horizontal steel ring is formed on the upper side wall, and a roof of a concrete structure connected to the horizontal ring is formed. Composite structure storage tank of concrete body. 2. A flexible membrane that covers the upper part of the storage tank body by forming at least the upper part of the side wall of the storage tank body with a steel plate, forming a horizontal steel ring on the upper side wall, and fixing the peripheral edge to the horizontal ring. A composite structure storage tank of a steel plate and a concrete body, wherein a roof of a concrete structure connected to the horizontal ring is formed on an outer surface of the flexible film body. 3. A storage tank main body having at least an upper portion of a side wall formed of a steel plate, a horizontal steel ring formed on the upper side wall, and a horizontal side of a flexible film body covering the membrane body mounting portion of the horizontal ring and the upper side of the storage body. A flexible film body is attached to the horizontal ring by joining the ring attachment portion, air pressure is applied to the inner surface of the flexible film body, and a roof of a concrete structure is formed on the outer surface of the flexible film body to which the air pressure is applied. The method for constructing a composite structure storage tank comprising a steel plate and a concrete body according to claim 1 or 2, characterized in that: