JP2002256725A - Membrane roof of reservoir - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane roof of a reservoir kept tensioned and airtight to provide for good workability for its expansion, and being excellent in durability and economical efficiency. SOLUTION: A reservoir body is formed of a bottom plate and sidewalls stood on the outer peripheral edge of the bottom plate. A center post is erected at the center of the bottom plate of the reservoir body and the membrane roof is provided with a flexible membrane supported against the center post for covering the upper side of the reservoir body. The flexible membrane is formed into a double-membrane structure consisting of a lower membrane and an upper membrane such that the portion of a skirt part near the peripheral edge of the membrane is bifurcated into upper and lower parts. The lower membrane has its lower peripheral edge attached to the upper end of a sidewall while kept tensioned, and the upper membrane has its lower peripheral edge hermetically attached to the upper end of the sidewall.

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 liquids such as irrigation water and tap water, powders and grains such as grains and coal, or solids such as waste and garbage at normal pressure. This is related to the membrane roof to be provided.

[0002]

2. Description of the Related Art In general, a roof provided above a storage tank for storing liquids such as irrigation water and tap water, or powders and solids and the like under normal pressure is made of concrete or metal and has a rigid structure. Have been. The concrete and metal roofs must have a robust structure because of the increased weight and load, and the storage tank body supporting the roof had to be constructed in a robust structure. Therefore, it is considered that a roof having a lightweight and simple membrane structure is provided on the upper portion of the storage tank main body instead of the roof having the above-described robust structure.
As an economical membrane roof with a lighter and simpler structure, a suspended membrane roof structure supported by center posts and ropes without using complicated roof bones and frames, that is, a membrane roof with a suspension membrane structure is known. I have.

[0003]

When the above-mentioned lightweight and simple suspended membrane roof, that is, a membrane roof having a suspension membrane structure is provided so as to cover the upper part of the storage tank, rainwater does not stay on the upper part of the membrane roof. In addition, it has been demanded that contaminants do not accumulate and flutter due to strong winds. That is, it has been difficult to attach the peripheral attachment portion in an airtight state while keeping the entire membrane in a tensioned state so that the flexible membrane does not hang down and generate no slack. The work of mounting the flexible membrane on the upper end of the side wall of the storage tank is difficult to handle because it requires simultaneous work of fixing the peripheral edge of the membrane tightly while applying tension to the membrane. It is difficult to align the peripheral portion with the anchor bolts at the upper end of the storage tank because the flexible film is likely to be displaced, deformed, and wrinkled. It was necessary.

[0004] In addition, the construction of the membrane roof zenith is difficult and difficult when positioning the center of the membrane after lifting the flexible membrane and moving it above the upper end of the center support.
Further, the work of fixing the central portion of the film body to the upper end portion of the center support is difficult to process because the wrinkles are unwound or gathered, which requires labor and labor. The work of attaching such a membrane to the upper part of the center support may need to be performed at an unstable position on the upper part of the membrane, and requires a scaffold or a stand, and the workability at that time is not good. Was.

The present invention has been made in view of the above problems, and provides a membrane roof of a storage tank which secures a tensioned state and an airtight state, has good workability for installation, and is excellent in durability and economy. Things.

[0006]

According to the present invention, there is provided a membrane roof for a storage tank, wherein a tank body is formed from a bottom plate and side walls provided on an outer peripheral edge of the bottom plate, and a center support is provided at the center of the bottom plate of the tank body. A membrane roof provided with a flexible membrane that is supported by the center support and covers the upper portion of the storage tank body, wherein the flexible membrane is a lower membrane that branches up and down near the periphery of a skirt. And the upper membrane is formed in a double membrane structure, the lower membrane is attached to the upper edge of the sidewall at the lower edge of the membrane in tension, and the upper membrane is airtight at the upper edge of the sidewall to the upper edge of the sidewall. It is attached.

[0007] Further, between the upper end portion of the center support and the upper end portion of the side wall, a lower cable that presses and contacts the flexible film body and supports it from below, and an upper line that engages with the flexible film body. And an upper ridge that can be pressed from above.

Further, a lower cylinder is provided at the upper end of the center support, and the lower cylinder and an upper cylinder fitted to the lower cylinder are flange-connected. The lower cable is attached to the flange, the central portion of the flexible membrane is fixed to the flange of the upper cylinder, and the upper cable is attached to the upper cylinder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a membrane roof of a storage tank according to the present invention will be described with reference to FIGS. FIG. 1 shows an example in which a membrane roof is provided in a large concrete tank such as a farm pond for storing irrigation water and a distribution reservoir for storing tap water. FIG. 2 shows the vicinity of the upper end of the side wall. Indicates the vicinity of the roof zenith. FIG.
(A), (b) shows an example of a procedure for constructing a membrane roof. In this embodiment, the case where the membrane roof is applied to a concrete storage tank will be described. However, even when the bottom plate and the side walls are large storage tanks or other storage tanks made of metal or the like, the membrane roof according to the present invention is used. It goes without saying that it can be applied.

As shown in FIG. 1, a storage tank main body 1 having a concrete structure is formed by a circular plate-shaped bottom plate 2 and a circular cylindrical side wall 3 vertically erected near an outer peripheral edge of the bottom plate 2. Have been. Membrane roof 4 provided on top of this storage tank body 1
Is a steeply rising slope 10 from the top end 9 of the thick side wall with large cross-sectional performance toward the center of the storage tank.
, The roof top 10 is formed of a flexible film 7 covering a substantially conical shape higher than the side wall 3. The flexible film body 7 having a substantially conical shape is formed by using, for example, a metal large-diameter pipe material, a shaped steel material, a concrete pile material, or the like between the bottom plate central portion 11 of the bottom plate 2 and the roof top 10. It is supported by a vertically supported center column 5.

The flexible membrane 7 is made of a material having flexibility and airtightness, for example, a material obtained by coating a synthetic resin material on a fiber woven fabric. The periphery of the flexible film 7 is held near the periphery of the bottom of the flexible film 7 and the lower film 7A and the upper film 7B, which are vertically branched. The lower membrane 7A extends from the flexible membrane 7 and has a lower peripheral edge attached to the side wall upper end 9 in tension, and an upper membrane 7B is attached to the outer peripheral edge of the lower membrane 7A. The upper part is covered, and the lower peripheral edge is attached to the side wall upper end part 9 in an airtight state.

A cable 6 such as a wire rope formed by twisting steel wires is radially stretched between the center column upper end 8 and the side wall upper end 9 of the center column 5.
The cable 6 is engaged with the lower cable 6A that supports the flexible membrane 7 from below with a pressing force by contact, and is engaged with the flexible membrane 7 to lift or move by suppressing the movement due to the engagement. Is formed with the upper cable 6B that presses from above, so that the flexible membrane 7 is disposed so as to be sandwiched between the lower cable 6A and the upper cable 6B.

A double membrane structure at the peripheral edge of the skirt of the flexible membrane body 7;
An example of the mounting structure will be described in detail with reference to FIG. As shown in FIG. 2, the lower film body 7 </ b> A branched vertically and formed into a double film structure is continuously extended from the flexible film body 7, and its outer peripheral edge is located at the upper end of the side wall at the forward position. 9
To tension. In the structure to be attached in this tensioned state, for example, the peripheral portion of the lower film body 7A is formed shorter than the position reaching the attaching portion of the upper end portion 9 of the side wall, and the eyelet portion 17 is formed on the peripheral edge of the lower film body 7A. And the eyelet portion 17 is provided.
Is tightened. That is, the fastening member 18 such as a wire or a rope is inserted into the eyelet 17 and the upper end 9 of the side wall is inserted.
Attached to the bar-shaped member 16 arranged annularly along the circumferential direction of
It is tightened by a fastener 18A having a check structure such as a buckle. In addition, the rod-shaped member 16 shows a case where the fixing bracket 15 is embedded and fixed at a predetermined interval along the circumferential direction of the upper end portion 9 of the side wall, and a steel bar or the like is inserted into the fixing bracket 15 to form an annular shape. I have. In this manner, the lower film body 7A is adjusted and mounted in sequence by tightening, for example, is divided into a predetermined range, and the work is performed with good workability while adjusting the balance of the tension state, and the entire flexible film body 7 is uniformly stretched. Can be installed.

Further, as shown in FIG. 2, the upper film 7B which is branched up and down to form a double film structure has a predetermined area above the outer peripheral edge mounting portion of the lower film 7A. Cover it with a gentle slope without applying tension and install it in an airtight state. The upper film body 7B is, for example, a substantially rectangular film body having a predetermined width, and its inner peripheral edge 19 is joined to the upper surface of the lower film body 7A along the circumferential direction by welding, bonding, stitching, or the like. Is fixed to the upper end 9 of the side wall in an airtight state by a detachable surface joining member such as a film protecting material, a holding plate, and an anchor bolt / nut.
Reference numerals 1 and 21 are fixed by a surface joining member such as a detachable planar fastener or a double-sided joining tape. As described above, since the upper film body 7B is coated without giving much tension,
Since it is difficult to cause displacement and deformation, it can be airtightly mounted with a reasonable surface bonding, and the upper opening of the outer peripheral edge mounting portion of the lower film body 7A is gently inclined to cover, so that the film roof It is possible to prevent the rain, dust and the like from sliding down smoothly to the outer peripheral side and entering the storage tank.
The outer peripheral edge 20 has a detachable structure,
1 is also formed in a detachable simple mounting structure, so that the upper film body 7B is opened to perform additional adjustment of the tension of the lower cable 6A and the lower film body 7A, and inspection and maintenance of mounting brackets and the like. It can be carried out.

Referring to FIG. 2, an example of a mounting structure of a lower cable 6A and an upper cable 6B radially extending above and below the flexible film body 7, respectively, will be described. The lower cable 6A is a mounting bracket 12 buried and fixed at a predetermined interval along the circumferential direction on the innermost side of the upper end 9 of the side wall made of concrete.
A is engaged with the edge, and is attached using a fastener 13A such as a turnbuckle or a lever block. The upper cable 6B is attached to a mounting bracket 12 buried and fixed at a predetermined interval along the circumferential direction on the outermost side of the upper end 9 of the side wall made of concrete.
The edge is engaged with B, and it is attached using a fastener 13B such as a turnbuckle or a lever block.

As described above, the flexible membrane 7 is extended in a tensioned state, and furthermore comes into contact with the plurality of lower ropes 6A which are radially extended with a pressing force and is supported from below by an average. Therefore, it is possible to further improve the durability against loads such as defoliation, earth and sand, rain and snow. Further, the flexible membrane 7 covers the upper part of the outer peripheral edge mounting portion, and the periphery thereof is firmly and air-tightly fixed. Further, the flexible membrane 7 is radially formed by a plurality of engaging members 14 provided on the upper surface of the flexible membrane 7. Since it is pressed from above in a well-balanced manner so as to engage with the plurality of stretched upper ropes 6B to suppress movement, it is more durable against lifting and fluttering due to strong winds and changes in atmospheric pressure. Can be improved. The membrane roof 4 thus formed
Is installed in a water tank such as an outdoor farm pond or a distribution reservoir, dust such as fallen leaves and earth and sand is not deposited on the upper surface of the flexible film body 7 but along the inclined upper surface by gravity. It can be smoothly dropped around the storage tank, and rainwater and snow can be drained to the periphery without collecting on the upper surface of the flexible film body 7. If such a membrane roof 4 is applied to a storage tank such as an existing roofless farm pond, the roof becomes lighter, easier to construct, and more economical.

The flexible membrane 7 is made of, for example, polyester fiber,
Polyurethane fiber, woven fabric of carbon fiber, etc., coated with a synthetic resin material such as polyurethane, vinyl chloride resin, fluoro rubber, etc.
It has weather resistance and corrosion resistance against corrosive gas contained in the atmosphere, rain and the like, and can be used for a long period of time like a permanent outdoor membrane roof structure.
When a material that blocks sunlight, such as a black fiber, a resin, or an opaque material, is used, the sunlight does not enter the inside of the storage tank body 1, and a storage tank such as a farm pond or a distribution reservoir is used. In this case, it is possible to prevent the occurrence of algae and the like prosperous due to sunlight.

An example of the structure near the roof top 10 will be described with reference to FIG. In the center column upper end 8,
A funnel-shaped lower cylindrical body 23 whose inner diameter increases upward is connected, and a lower flange 22 that protrudes in a horizontal ring shape is provided at an upper end edge of the lower cylindrical body 23. An upper flange 24 extending in the form of a horizontal ring is provided so as to make surface contact with the lower flange 22. After the lower portion of the upper flange 24 is loosely inserted into the lower cylindrical body 23, FIG.
An upper cylindrical body 26 having a guide member 25 whose outer diameter decreases downward is provided so as to be accommodated in the fitted state as shown in FIG. Then, the lower flange 22 and the upper flange 24
Are connected using fixing members 27 such as bolts and nuts. A fixing member 27 such as a bolt and a nut is attached to the upper flange 24, and the edge of the film body central portion 28 of the flexible film body 7 is inserted into the bolt, and is sandwiched by using a surface-contacting plate or a washer. Tighten the nut to fix it tightly. In addition, the lower cable 22 is attached to the lower flange 22.
The upper cylindrical body 26 is provided with a fixing portion 29 for mounting the edge of the upper cable 6B.

As described above, the lower cylinder 23 provided at the upper end portion 8 of the center column and the upper cylinder 26 fitted to the lower cylinder 23 are formed to be connected by the flanges 22 and 24. Thus, the positioning and connection work via the guide member 25 can be easily performed. Further, the fixing work of the lower cable 6A and the upper cable 6B, and the film center 2 at the edge of the flexible film 7
The fixing work of 8 is also facilitated, and a series of expanding work is performed in which the flexible film body 7 is moved, unfolded, and attached while being supported by the radially extending lower cable 6A. Thereby, the deployment work and the attachment work of the flexible film body 7 can be performed with good workability. Further, the film central portion 28 of the flexible film 7 can be fixed to the upper flange 24 in advance at a low place on the ground with good workability and safe operation. The work of fixing the upper flange 24 to the lower flange 22 can be positioned along the guide member 25, so that there is no need to perform the positioning work on the center part 28 of the film body, and the upper end of the center post is required. 8 can be easily and easily attached by safety work from the lower side, and since the film body central portion 28 is fixed and stable, the flexible film body 7 is expanded toward the periphery, and the side wall upper end 9 The work of connecting to the server becomes easier.

An example of the procedure for constructing the membrane roof of the storage tank will be described in further detail with reference to FIGS. 4 (a) and 4 (b). As shown in FIG. 4A, a center support 5 is erected on a central portion 11 of the bottom plate 2 surrounded by the side wall 3, and a lower cable is provided between the center support upper end 8 and the side wall upper end 9. Cross the line 6A and fix it in tension. Next, the zenith 10 to which the flexible membrane 7 and the upper cable 6B are fixed in advance on a low place on the ground is lifted and moved to the center column upper end 8 as shown by arrows. Then, as shown by the arrow in FIG. 4B, the zenith part 10 that has been lifted and moved is hung, aligned, and connected to the center column upper end part 8. Next, as shown by the arrow, the lower cable 6A is used as a support frame, and the flexible membrane 7 is developed and fixed to the upper end 9 of the side wall, and the upper cable 6B is stretched thereon.

Since the membrane roof is constructed as described above,
The flexible membrane member 7 and the upper cable 6B can be fixed to the zenith portion 10 by a safe operation with good workability at a low place on the ground, and then the zenith portion 10 is hung and fixed to the center column upper end 8. In addition, the flexible membrane 7 is extended with good stability and workability while being supported by the lower rope 6A that has been stretched in advance, and the upper rope 6 on the flexible membrane 7 is stretched.
B can be stretched, so that the membrane roof is excellent in a series of workability during construction.

[0022]

As is apparent from the above description, the membrane roof of the storage tank according to the present invention is composed of a lower membrane body that branches up and down near the periphery of the skirt of the flexible membrane body that constitutes the membrane roof, and an upper membrane body. Formed in a double membrane structure of the membrane, the lower membrane is attached with the lower edge of the membrane at the upper end of the side wall in tension, and the upper membrane is attached with the lower edge of the membrane at the upper end of the sidewall in an airtight manner. Therefore, it is possible to apply a predetermined tension to the lower membrane in advance, and then cover the upper membrane to obtain an airtight state. The role of the airtight covering by the body is shared, so that the flexible membrane body can be securely and securely attached with good workability. Then, the flexible membrane body is maintained in a predetermined tension state and is kept airtight, and it is possible to prevent rain, dust, and the like on the membrane roof from dropping smoothly around and to invade the storage tank. It is durable against snow, dust, wind and the like, has a simple structure, is lightweight, has high strength and is durable, and can be a membrane roof of a storage tank having excellent economic efficiency.
In addition, since it is possible to open the upper membrane as needed and apply tension to the lower membrane, inspection and maintenance of the mounting portion and the mounting bracket can be performed appropriately, so that the It becomes an economical membrane roof considering the durability of the membrane.

[0023] Further, between the upper end portion of the center support and the upper end portion of the side wall, a lower cable which presses and contacts the flexible membrane and supports it from below, and In the case of a membrane roof provided with an upper cable that can be pressed from above, the lower cable can further suppress drooping against a load such as rain, snow, and dust by the pressing support by the lower cable, and can also engage with the upper cable. As a result, the stability and toughness of the entire membrane roof are increased, and the reliability against a large load change is further improved.

Further, a lower cylinder is provided at the upper end of the center support, and the lower cylinder and an upper cylinder fitted to the lower cylinder are flange-connected to each other. The lower cable is attached to the flange, the center of the flexible membrane is fixed to the flange of the upper cylinder, and the upper cable is attached to the membrane roof formed by attaching the upper cable to the upper cylinder. Thus, alignment and connection for hanging and guiding and fitting the central portion of the membrane roof can be easily performed, and the fixing of the membrane body and the cords at the central portion of the membrane roof can be performed in a stable state and efficiently. The work of fixing the central portion of the flexible membrane body to the upper tubular body and the work of attaching the upper cable can be performed in advance at a low place on the ground with good workability and safe work, and then, as described above. After fitting to the lower cylinder and connecting it to the flange, the flexible cable is moved from the zenith to the periphery by using the lower cable as a support base when the membrane is deployed. In addition, since the work of unfolding and the work of attaching to the upper end of the side wall become easy, a membrane roof having excellent workability at the time of construction can be obtained.

[0025]

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory side view schematically showing an embodiment of a membrane roof of a storage tank according to the present invention, in which a part is omitted and a cross section is shown.

FIG. 2 is a perspective explanatory view in which a part of an outline near an upper end of a side wall is partially cut away and a cross section is omitted.

FIG. 3 is an explanatory side view showing a part near a roof zenith part in a schematic form with a part thereof being cut away;

FIGS. 4 (a) and 4 (b) are side explanatory views showing a part of a procedure for constructing a membrane roof of a storage tank, in which a part is omitted and a cross section is shown.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Storage main body 2 Bottom plate 3 Side wall 4 Membrane roof 5 Center support 6 Cable 6A Lower cable 6B Upper cable 7 Flexible film 7A Lower film 7B Upper film 8 Center support upper end 9 Side wall upper end 10 Roof Zenith part 11 Bottom plate center part 12A Mounting bracket 12B Mounting bracket 13A Fastening tool 13B Fastening tool 14 Engaging member 15 Fixing metal 16 Bar-shaped member 17 Peripheral eyelet 18 Fastening member 18A Tightening tool 19 Inner circumference 20 Outer circumference 21 Both sides 22 Lower flange 23 Lower cylinder 24 Upper flange 25 Guide member 26 Upper cylinder 27 Fixing member 28 Central part of film body 29 Fixing part 30 Fixing part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masanori Tamada 4-2-111 Ginza, Chuo-ku, Tokyo F-term in Ishii Iron Works Co., Ltd. (Reference) 2E141 AA00 BB03 BB04 CC03 CC04 DD03 EE23 EE26 EE33

Claims (3)

[Claims] 1. A storage tank main body is formed from a bottom plate and a side wall provided upright on an outer peripheral edge of the bottom plate. A center support is erected at the center of the bottom plate of the storage plate main body. A membrane roof provided with a flexible membrane body to be coated, wherein the flexible membrane body is formed in a double membrane structure of a lower membrane body and an upper membrane body branching up and down around the periphery of a skirt, The membrane roof of the storage tank, wherein the side membrane body is attached to the upper edge of the side wall in a tension state at the lower edge of the membrane body, and the upper membrane body is airtightly attached to the lower edge of the membrane body at the upper end of the sidewall. 2. A lower cable that presses and contacts the flexible membrane from below and supports the flexible membrane from below between an upper end of the center support and an upper end of the side wall. 2. The membrane roof of the storage tank according to claim 1, further comprising an upper cable that is pressed from the upper side. 3. A lower cylinder is provided at an upper end of the center support, and the lower cylinder and an upper cylinder fitted to the lower cylinder are flange-connected. The lower cable is attached to the flange, the central portion of the flexible membrane is fixed to the flange of the upper cylinder, and the upper cable is attached to the upper cylinder. The membrane roof of the storage tank according to claim 2.