JPH0533523A - Construction method of concrete dome roof and membrane structure used therefor - Google Patents

Abstract

(57) [Summary] [Purpose] Only the upper part of the structure such as the storage tank has an airtight structure, and internal work can be done during the construction work of the dome roof, and the construction period can be shortened as a whole. Makes roof construction easier. [Structure] Dome-shaped upper membrane (3) and the upper membrane (3)
Both outer peripheral portions of the lower membrane (4) stretched underneath are tightly fixed to the upper portion of the structure (1) such as a storage tank, and the upper membrane (3) and the lower membrane (4)
The space formed between them is maintained at a predetermined pressure, and after the concrete (13) is cast on the upper surface of the upper film (3), the lower film (4) is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper portion of a structure such as a flexible membrane or a metal shell which receives air pressure in a structure such as a storage tank for storing various kinds of storage such as liquid, low temperature liquefied gas, powder, and granular material. And a concrete-made dome (hereinafter referred to as a dome in the present invention includes various shapes such as spherical surface, curved surface, polyhedron) on the upper surface of the flexible film or metal shell. And a membrane structure used therefor.

[0002]

2. Description of the Related Art Conventionally, the upper part of a structure such as a storage tank is covered with a flexible film or a metal shell that has been subjected to high-pressure air pressure, and a concrete dome roof is constructed on the upper surface of the flexible film or the metal shell. There is a way. In this method, high pressure air in a structure such as a storage tank is used to place a concrete on the upper surface of the flexible film or metal shell while keeping the flexible film or metal shell in a dome shape. Yes (referred to as Prior Art 1). In addition to this, a roof having a double air film structure and a method for constructing the roof have been conventionally known. That is, in the conventional roof construction method of a double membrane type air membrane structure, a compression ring is installed on the upper part of the structural body, and between the upper membrane material and the lower membrane material and the lower membrane material or both upper and lower membrane materials. A roof assembly consisting of a plurality of membrane supports disposed above is lifted from the ground, the membrane supports are placed on the compression ring and tension is applied to the membrane supports, and then the membrane supports are attached to the compression rings. It is a method of fixing and then fixing the peripheral portion of the film material to the compression ring (Japanese Patent Laid-Open No. 62-62).
No. 72868) (referred to as prior art 2).

Further, as a building with an air roof, an indoor horizontal guide support member, a direct upward guide support member, and an outdoor oblique upward guide support member are radially provided on the top of a pillar standing on the ground, and the outdoor An air roof vinyl sheet reinforcing net is attached to each end of the obliquely upward guide support member and the indoor horizontal guide support member, and an air bag vinyl sheet for an air roof is installed between the nets. There is one in which the air bag is installed and compressed air is sent to the air bag to inflate it, and a downwardly projecting bent portion is formed in its peripheral portion (refer to Japanese Patent Publication No. 1-57224) (referred to as prior art 3). Furthermore, as a double-air film structure roof, a double-air film structure roof is constructed by doubling the membrane on the upper and lower parts of the surrounding beams whose corners are reinforced by horizontal braces.
There is a system in which a frame is attached to the space, and a pressurizing device for pressurizing the inside of the double film and a snow melting device for sending warm air to the inside of the double film are installed on the frame in the double film (Japanese Patent Laid-open No. Sho-200). 62-13
7372) (referred to as Prior Art 4).

[0004]

The method of constructing a concrete dome roof according to the prior art 1 is to use a flexible membrane or a metal shell, which has been subjected to high-pressure air pressure in a structure such as a storage tank, on the upper part of the structure. In order to cover the structure, there is no need to assemble a flexible membrane or a scaffold that holds a metal shell, but on the other hand, the structure such as a storage tank must be fully sealed with high-pressure air. There were difficulties. Therefore, this construction method has a drawback that it is not suitable for the construction method of buildings having windows, lattices, gaps and the like. Further, even when constructing a concrete dome roof on the upper part of the storage tank, the work of sealing to prevent air leakage from the nozzle portion, the support portion, etc. has been difficult. Further, since the flexible film or the metal shell has a single-layer structure and covers the upper part of the structure such as the storage tank, not only the airtight work of the peripheral portion of the flexible film or the metal shell is difficult but also the peripheral portion is attached. It was tough.
Moreover, while the flexible membrane or the metal shell is being held in the dome shape by the high-pressure air pressure, the work of placing the concrete on the upper surface of the dome-shaped flexible membrane or the metal shell is performed. While doing so, there was a problem that people could not enter the structure such as the storage tank, and internal work could not be done during that time.

The inventions of the prior arts 2, 3 and 4 are all permanently installed as a roof having a double air membrane structure in which air is enclosed between the upper membrane and the lower membrane to inflate. Is. However, the prior arts 2, 3 and 4 do not have a structure that can withstand placing a concrete on the upper surface of the upper membrane, and the introduction of high-pressure air causes air to flow from the peripheral portions of the upper membrane and the lower membrane. May leak. Moreover, each of the above-mentioned double-air film structure roofs is a pedestal when constructing a concrete dome roof on the upper part of a structure such as a storage tank, that is, a temporary two-use structure that is temporarily used as a support or a formwork. It is not a multilayer structure. The present invention has been made in view of the above points, and an object thereof is to construct a concrete dome roof without constructing a storage tank or other structure as an airtight structure without constructing an entire structure such as a storage tank or the like. Only the upper part of the object needs to have an airtight structure, and even during the construction work of the concrete dome roof, people can enter the inside of the structure such as the storage tank and perform internal work independently, shortening the overall construction period It is an object of the present invention to provide a construction method that facilitates the construction of a concrete dome roof, and a membrane structure used for the construction.

[0006]

Means for Solving the Problems Concrete according to the present invention
The construction method of the dome roof made of air is to coat the upper part of the structure such as a storage tank with a flexible membrane or metal shell that receives air pressure, and build a concrete dome roof on the upper surface of the flexible membrane or metal shell. In the method described above, both outer peripheral edges of the dome-shaped upper membrane and the lower membrane stretched under the upper membrane are hermetically fixed to the upper portion of a structure such as a storage tank, Maintaining a predetermined air pressure in the space formed between the upper membrane and the lower membrane by adjusting the air supply and the exhaust from each of the provided air supply port and exhaust port, maintaining the upper film in a dome shape, A concrete (including mortar) is cast on the upper surface of the upper film to form a dome roof, and then the lower film is removed. Further, the membrane structure used for constructing a concrete dome roof includes a flexible membrane having a dome shape capable of covering the upper part of a structure such as a storage tank or an upper membrane formed of a metal shell, and the upper membrane. Both the outer peripheral edge part of the flexible film stretched below the film or the lower film formed of a metal shell is hermetically fixed to the upper part of the structure, and an air supply port and an exhaust port are provided in the upper film and / or the lower film. It is formed and a separating member is provided at the peripheral edge of the inferior membrane.

[0007]

[Function] Before attaching the flexible membrane or the upper and lower membranes of the metal shell, first, a membrane support material such as a spreading rope is stretched on the upper part of the structure such as a storage tank, and the peripheral edge of the membrane support material. Part is fixed to the upper part of the structure such as a storage tank. The dome-shaped upper membrane and the lower membrane stretched under the upper membrane are arranged above the membrane support. Both the outer peripheral edge portions of the upper membrane and the lower membrane may be sealed beforehand in a bag shape or the like, or each outer peripheral edge portion may be hermetically fixed at the upper portion of the structure such as a storage tank at the work site. After the outer peripheral edges of the flexible membrane or metal shell upper and lower membranes are hermetically fixed to the upper part of the structure such as a storage tank, air is supplied from the air supply port provided in the upper membrane and / or the lower membrane, and the air is exhausted. From the mouth, the amount of exhaust gas is adjusted to fill the space formed between the upper and lower films with air. The air-filling keeps the upper membrane in a dome shape,
The internal pressure is set to withstand the weight of the concrete placed on the upper surface of the film and the weight of the operator. Further, the lower membrane is supported by a membrane support material such as a spreading rope. A concrete is placed on the upper surface of the upper membrane maintained in a dome shape, and the concrete
After constructing the dome roof, the outer peripheral edge of the lower membrane is removed together with the outer peripheral edge of the membrane supporting material to complete the construction work of the dome roof.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side cross-sectional explanatory view showing a state in which a concrete dome roof according to the present invention is constructed, which is partially cut away.
6A and 6B are plan explanatory views showing the installation state of the erection rope, FIG. 7A shows a case of a cylindrical structure, and FIG. 8B shows a case of a semi-cylindrical structure. FIG. 3 is a side cross-sectional explanatory view in which a part of the outer peripheral edge portion of the upper membrane and the lower membrane showing the attachment structure to the support portion is omitted.
(A) seals one location, (b) seals two locations,
(C) shows the case where the upper and lower membranes are removed and the mounting structure is reusable. FIG. 4 shows another embodiment of the present invention, which is a side cross-sectional explanatory view with a part cut away when a metal shell is used as the upper film. Reference numeral 1 denotes a structure such as a storage tank such as a concrete tank (in this example, a concrete tank is shown). 1a is its side wall, 1b is its bottom plate, 1c is side wall 1
The air supply pipe insertion hole formed in the lower part of a is shown by 1d, and the exhaust pipe insertion hole formed in the lower part of the side wall 1a is shown. A membrane support material 2 such as a spreading rope is stretched on the upper inside of the structure 1 such as a storage tank. When the structure 1 such as the storage tank has a cylindrical shape as shown in FIG. 2 (a), the ropes 2b are extended radially from the ring portion 2a at the center toward the rope fixing portion 1e on the upper inner side of the side wall 1a. Extend. Further, when the structure 1 such as the storage tank has a semi-cylindrical shape as shown in FIG. 2 (b), it is extended linearly in parallel with the rope fixing portion 1e on the upper inner side of both side walls 1a in the longitudinal direction. 2b
Extend. The extension rope 2b is provided with auxiliary ropes (not shown) in a grid pattern between them, and a net is stretched to secure the safety of the upper operator of the structure 1 such as the storage tank. This is also possible, and is also a measure for preventing falling objects for workers who work in parallel on the lower portion of the structure 1 such as a storage tank.

Reference numeral 3 denotes a dome-shaped upper film made of a flexible film or a metal shell. FIGS. 1 and 3 show the case of a flexible film, and FIG. 4 shows the case of a metal shell made of steel or the like. . The flexible film is formed of a sheet body having excellent strength, airtightness, watertightness and corrosion resistance. Reference numeral 4 denotes a flexible film or a lower film made of a metal shell (in this example, a flexible film is shown), which is formed in a flat shape slightly larger than the planar shape of the structure 1 such as a storage tank. Further, a chuck portion 9 is formed on the peripheral portion of the lower film 4 so that the removal operation of the lower film 4 after the construction of the concrete dome roof can be easily performed. When a metal shell or the like that does not form the chuck portion 9 is applied, the peripheral portion of the lower film 4 may be cut and removed. Reference numeral 5 denotes an air supply port formed in the lower film 4, and 6 denotes an exhaust port formed in the lower film 4. The air supply port 5 and the exhaust port 6 are not limited to being formed in the lower film 4, but may be formed in the upper film 4 as shown in FIG. Reference numeral 7 denotes an air supply pipe connected to the air supply port 5 and connected to a blower (not shown) installed outside the structure 1 such as the storage tank through the air supply insertion hole 1c.
Denoted at 8 are exhaust pipes which are connected to the exhaust port 6 and are discharged through the exhaust insertion hole 1d to the outside of the structure 1 such as the storage tank.
Both outer peripheral edge portions of the upper membrane 3 and the lower membrane 4 are hermetically fixed to the upper supporting portion 1f of the structure 1 such as the storage tank.
Either of them may be adhered to each other in advance in a bag shape by welding, sewing, or the like, or the peripheral edge of each may be hermetically fixed to the support portion 1f of the upper portion of the structure 1 such as a storage tank.

As means for hermetically fixing both outer peripheral edge portions of the upper membrane 3 and the lower membrane 4 to the upper support portion 1f of the structure 1 such as the storage tank, as shown in FIG. Pinch, and while further pressing with the pressing plate 11, anchor bolt 1
Fix at 2. Alternatively, as shown in FIG. 3 (b), the rod-shaped packing 10 may be sandwiched between the end portion and the end portion, and fixed by the anchor bolt 12 while being pressed by the pressing plate 11 in the middle. Further, as shown in FIG. 3 (c), the upper membrane 3 and the lower membrane 4 can be detached and reused so that the upper membrane 3 and the lower membrane 4 have rod-shaped end portions on both inner peripheral edges of the upper membrane 3 and the lower membrane 4 so that they can be reused. Alternatively, the packing 10 may be sandwiched and further fixed by the anchor bolts 12 while being pressed by the pressing plate 11. Dome-shaped upper membrane 3 on the membrane support 2 and the upper membrane 3
After sealing both outer peripheral edge portions with the lower membrane 3 stretched underneath to the upper portion of the structure 1 such as the storage tank, the gas is connected to the air supply port 5 provided in the upper membrane 3 and / or the lower membrane 4. Air continuously blown from the trachea 7 by a blower (not shown) or the like is filled in the space formed by the upper membrane 3 and the lower membrane 4 so that the upper membrane 3 maintained in a dome shape is formed. The internal pressure is set to withstand the weight of the concrete and the weight of the operator, and the exhaust pipe 8 is exhausted from the exhaust port 6.
The air is continuously exhausted to the outside of the structure 1 such as the storage tank, and the inside of the space is maintained at a predetermined internal pressure. At this time, the lower membrane 4 is installed and rolled.
When supported by the rope 2b, the lower membrane 4 does not need a high-strength membrane because it is assisted by the tension of the spreading rope 2b, and the lower membrane 4 is prevented from sagging and a wide space is secured. In this way, with the internal pressure of the space formed by the upper membrane 3 and the lower membrane 4 being controlled, the concrete 13 is cast on the upper surface of the upper membrane 3 to form a dome roof. After building the dome roof,
The lower film 4 is removed together with the spreading rope 2b. When the lower film 4 has the chuck portion 9, it can be removed simply and quickly by simply removing the chuck portion 9.

[0011]

As can be seen from the above description, the present invention does not require that the entire structure of the storage tank or the like is formed on the upper portion of the structure such as the storage tank in constructing the concrete dome roof. The space formed by the upper and lower membranes that are sealed and fixed only needs to have an airtight structure, and can be applied to buildings with windows, lattices, gaps, etc. There is no need to worry about air leakage, and it can be widely applied to the construction of concrete dome roofs for general structures such as storage tanks. Further, after the construction of the concrete dome roof, it is only necessary to remove both peripheral portions of the inferior membrane and the membrane supporting material, so that the removal work after construction is easy, and
After removing the lower membrane and the membrane supporting material, a wide space is secured in the structure such as the storage tank. And, even during the construction work of the concrete dome roof, it is only necessary to air-control the inside of the space formed by the upper membrane and the lower membrane, the amount of air blown is small, and the responsiveness of the control is good. Well, not only can a person enter the inside of a structure such as a storage tank to perform internal work independently, but there is no danger of falling objects, so work can be performed with peace of mind, and the overall construction period can be shortened. By using the membrane structure used in the construction of the concrete dome roof according to the present invention, the membrane body is used as a lower frame, and the construction of the concrete dome roof is formed more quickly. And can be reused if necessary. Further, by forming the chuck portion on the peripheral portion of the lower film, the work of removing the lower film becomes easier.

[Brief description of drawings]

FIG. 1 is a side cross-sectional explanatory view showing a state in which a concrete dome roof according to the present invention is constructed, with a part thereof being cut away.

FIG. 2 is an explanatory plan view showing the installation state of the erection rope,
(A) shows the case of a cylindrical structure, (b) shows the case of a semi-cylindrical structure.

FIG. 3 is a side cross sectional explanatory view showing a part of the outer peripheral edge portion of the upper membrane and the lower membrane showing the attachment structure to the support portion, with (a) sealing one place and (b) two places. And (c) shows a case where the membrane body is removed to provide a reusable mounting structure.

FIG. 4 is a side cross-sectional explanatory view showing another embodiment of the present invention, in which a metal shell is used as an upper film, a part of which is cut away.

[Explanation of symbols]

1 Structures such as storage tank 1a Side wall 1c Air supply pipe insertion hole 1d Exhaust pipe insertion hole 2 Membrane support 2b Extension rope 3 Upper membrane 4 Lower membrane 5 Air supply port 6 Exhaust port 9 Chuck part 13 Concrete

Claims (2)

[Claims] 1. A method for covering the upper part of a structure such as a storage tank with a flexible membrane or a metal shell subjected to air pressure, and constructing a concrete dome roof on the upper surface of the flexible membrane or the metal shell.
Air supply provided on the upper membrane and / or the lower membrane by hermetically fixing both outer peripheral edges of the dome-shaped upper membrane and the lower membrane stretched under the upper membrane to the upper part of a structure such as a storage tank. The air supply and the exhaust air are regulated from the inlet and the outlet, respectively, to maintain a predetermined air pressure in the space formed between the upper membrane and the lower membrane, maintain the upper membrane in a dome shape, and A method for constructing a concrete dome roof, which comprises placing a concrete on the upper surface to form a dome roof, and then removing the lower membrane. 2. An upper film formed of a dome-shaped flexible film or a metal shell capable of covering the upper part of a structure such as a storage tank, and a flexible film or a metal shell stretched below the upper film. A concrete characterized in that both outer peripheral edges of the formed lower membrane are sealed, an air supply port and an exhaust port are formed in the upper membrane and / or the lower membrane, and a separating member is provided on the peripheral edge of the lower membrane. Membrane structure used to build a dorm roof