JPH07173953A - Construction method of steel roof and member used therefor - Google Patents

Abstract

PURPOSE:To improve workability, safety, and economic efficiency. CONSTITUTION:The upper part of a storage tank is covered with a membrane 3 which is kept higher at the top 4 of membrane than a roof-shaped position by means of air pressure and the center ring 7 of the roof skeleton frame is placed on the top of membrane. Roof skeleton frame rafters 9 getting into plane-contact with the membrane are connected and fixed together between the center ring of roof skeleton frame and the side brackets 8 provided above the attaching part 5 of the peripheral membrane within the side wall, above the membrane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to gas, liquid, powder,
For gas holders, storage tanks, silos, etc. that store granular materials, etc., for domed steel roof construction method and its construction in various tanks whose bottom and side walls are made of steel or concrete or a combination of steel and concrete The present invention relates to members used.

[0002]

2. Description of the Related Art When a dome-shaped roof is made of concrete, a flexible membrane body subjected to internal pressure is used as a construction method,
Conventional examples of construction using a support work or a scaffold are disclosed in, for example, Japanese Patent Application Laid-Open No. 4-1111872 and Japanese Patent Application No. 4-307854.

Further, conventionally, a construction method is generally used in which a center mount is provided in the center of the storage tank, and the roof is constructed by supporting the center with this mount.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention [Patent Document 1]
In the inventions of No. -111872 and Japanese Patent Application No. 4-307854, since the flexible membrane body that has been subjected to internal pressure is used as a formwork, scaffolding or scaffolding for constructing a concrete dome roof, It was necessary to consider the shape of the outer surface of the membrane to match the shape of the concrete dome roof and maintain the shape during construction. Also, a metal seal layer is required to prevent air permeation and liquid leakage of the concrete roof, and consideration must be given to improving the airtightness and joint strength of the membrane attachment part of the side wall support part and the concrete joint part. there were.
Furthermore, since the concrete load and the load at the time of construction are strongly applied to the entire film body, it is necessary to consider such as protection with a frame or a cushioning material that supplements the uniform tensile strength of the entire film body.
Therefore, when applying the concrete dome roof construction method as described above to the construction of the steel roof detailed in the present application,
Since the strength and shape of the membrane for constructing the steel roof frame, the attachment structure of the membrane and the protective structure, etc. are problems, it cannot be applied as it is.

Further, in the conventional construction method of constructing a steel roof by providing a center frame at the center of the storage tank, a roof frame rafter is provided between two points of the center frame at the center of the storage tank and side brackets provided above the side walls. Since they were laid over and assembled sequentially, an excessive load and stress were applied to the roof frame rafter and the like at the time of construction. Therefore, in order to support the excessive load and stress applied at the time of this construction, it was necessary to make the roof frame rafter and the like a robust structure and to provide extra strength members and reinforcing members.

The present invention has been made to solve the above-mentioned problems, and in the construction of a steel roof, the outer shape of the membrane covering the upper part of the storage tank main body is not strictly limited to the roof shape and is easy. It is possible to manufacture it, and it can be efficiently attached and used at a predetermined position. In addition, by supporting the load of the roof bone on the membrane that has been subjected to internal pressure and performing the assembly work, the extra load and stress applied during the construction of the roof bone are not applied to the roof bone itself, and the strength of the roof bone is improved. It is intended to reduce and reduce the weight. Furthermore, when constructing a steel roof bone on the membrane, the roof member is formed into a structure in which the portion corresponding to the membrane is in surface contact with the workability,
It is intended to provide a steel roof construction method excellent in safety and economy and members used for the construction.

[0007]

According to the steel roof construction method of the present invention, the upper portion of the storage tank is covered with a membrane which is maintained at a state where the membrane zenith is higher than the roof shape position by air pressure. The roof bone centering is placed on the roof bone, and between the roof bone centering and the side brackets provided above the side wall inner peripheral edge membrane body mounting portion, the roof bone rafter that makes surface contact with the membrane body is connected and fixed. Form a roof bone.

Further, the membrane used for construction of a steel roof in which the upper part of the storage tank is covered with a membrane using air pressure and roof bone centering is placed on the zenith of the membrane to form a roof bone is The roof bone centering placement portion of the zenith portion of the membrane body at the time of pressurization is formed in a shape protruding from the roof shape position.

Further, the roof bone centering used for construction of a steel roof in which the upper part of the storage tank is covered with a membrane using air pressure and the roof bone centering is placed on the zenith of the membrane to form a roof bone. A ring plate that is in surface contact with the film body is provided in the lower portion, and a protective member that is in surface contact with the film body is provided in the lower portion of the side bracket provided above the side wall inner peripheral edge film body attachment portion of the storage tank.

[0010]

[Function] When air is introduced into the main body of the storage tank covered with the membrane and the roof bone centering is placed on the zenith of the membrane subjected to the internal pressure, the zenith of the membrane is positioned higher than the roof-shaped position. Held in. Next, the roof bone rafter is temporarily placed radially on the membrane, and while supporting the load with the membrane, one end of the roof bone rafter is connected to the side bracket provided above the side wall inner peripheral edge membrane attachment part. Then, connect the other end to the roof bone centering and assemble it with bolts and fix it. At this time, since the roof bone consisting of the roof bone centering and the roof bone rafter is supported by being in surface contact with the membrane body at the time of construction, the roof bone itself is not subjected to excessive load or stress applied at the time of construction. . After that, when the air pressure is released, the roof bone supported by the membrane naturally descends due to its own weight and becomes self-supporting, and finally, it conforms to the same height position as the predetermined roof shape with the entire roof load applied. Fixed.

The membrane used for construction of a steel roof in which the upper part of the storage tank is covered with a membrane using air pressure, and roof bone centering is placed on the zenith of the membrane to form a roof bone Since the roof bone centering placement location on the zenith of the membrane body is formed to project from the roof-shaped position, the ceiling of the membrane body subjected to internal pressure is fixed by air-tightly fixing the membrane body to the inner peripheral edge of the side wall. The top is easily held at a position higher than the roof-shaped position even when the load of the roof bone is received. Further, even if the film body is fixed at a position lower than the mounting position of the side bracket at the inner edge of the upper end of the side wall, the film body zenith can be maintained at a predetermined position higher than the roof-shaped position.

An upper part of the storage tank is covered with a membrane using air pressure, and a roof bone centering is placed on the zenith of the membrane to form a roof bone. Since the ring plate that is in surface contact with the film body is provided, when the roof bone centering is placed on the film body, it does not evenly contact the film body to cause rubbing or scratches. In addition, since the ring plate abuts the film body over a wide area, the load is relieved, and the film body is stable without being largely sunk or the ring plate tilting. Further, when the load of the fixed roof bone is taken up by the zenith portion of the membrane body, it can be received and transmitted evenly by the abutment surface of the roof bone centering. In addition, since the protective member that comes into surface contact with the film body is provided at the lower portion of the side bracket that is provided above the film body attachment portion on the side wall inner peripheral edge of the storage tank, the film body directly contacts the protruding portion at the lower end of the side bracket. Since the film body is protected by the wide contact surface of the protective member, it is not damaged. Further, the film is uniformly abutted along the shape of the film body to suppress local deformation.

[0013]

Embodiments will be described with reference to the drawings. 1 to 4 are cross-sectional explanatory views, partially omitted, showing a steel roof construction method according to the present invention. In the figure, 1 is a bottom wall, 2 is a side wall,
3 is a membrane body, 4 is a membrane zenith part, 5 is a membrane attachment part, 6 is a blower, 7 is a roof bone centering, 8 is a side bracket, 9 is a roof frame rafter, 10 is a roof frame, 11 is a roof plate. .

FIG. 1 shows a membrane zenith portion 4 on a membrane attachment portion 5 on an inner peripheral edge of a side wall of a storage tank main body composed of a bottom wall 1 and a side wall 2 made of steel or concrete or a combination of steel and concrete. The dome-shaped flexible film body 3 is airtightly fixed so as to project upward from the steel roof-shaped position indicated by the middle broken line, and the air pressure is introduced into the storage tank body below the film body 3 by the blower 6. Show.

FIG. 2 is continued from FIG. 1, and a roof bone rafter 9 is radially arranged at the central portion of the roof bone 10 on the zenith portion 4 of the membrane body located at the center of the above-mentioned membrane body 3. The roof bone centering 7 for mounting the roof bone is placed on the membrane 3 and then the membrane 3 is used as a support and a working floor. In a state of being in surface contact with and supporting the load, connecting and connecting between the roof bone centering 7 and the side bracket 8 provided on the inner peripheral edge of the side wall,
It shows a state in which the roof frame 10 is assembled and fixed with bolts or the like. In the membrane body 3, the roof bone centering 7 mounting portion of the membrane body zenith portion 4 at the time of air pressurization is formed in a shape projecting from the roof shape position, so that the roof of the membrane body zenith portion 4 to which the load is applied most is formed. The place where the bone centering 7 is placed can be easily maintained higher than the roof-shaped position. Furthermore, without lowering the membrane zenith portion 4 below the roof-shaped position, the membrane mounting portion 5
Can be provided separately at a lower position which is not obstructed by the side bracket 8 on the inner peripheral edge of the side wall.

3 continues from FIG. 2, the air inside the storage tank is exhausted from the exhaust port to reduce the boosting force in the storage tank, and
3 shows a state in which the roof bone 10 is made to stand by itself and is naturally lowered by its own weight, and the bolts and the like are tightened at the same height position as the roof shape to fix the roof bone 10 in an arch shape. In this case, the roof plate 1 constructed on the roof bone 10
Fix it at a height position that allows for the natural descending amount due to load 1.

FIG. 4 shows a state in which, following FIG. 3, the film body 3 is removed, and the roof plate 11 is installed on the roof frame 10. The steel dome roof is finally constructed into a roof shape having a predetermined height through the steps shown in FIGS. 1 to 4 described above.

FIG. 5 is an explanatory view in which a part of the mounting structure of the roof bone centering according to the present invention, which is used for constructing a steel roof covering the upper part of the storage tank, is omitted. The roof bone centering 7 is provided with an annular ring plate 12 at its lower part so as to come into contact with the membrane body, a cylindrical vertical ring plate 13 standing upright on the upper part of the ring plate 12, and an appropriate position on the outer side orthogonal to this. And a plurality of center ribs 14 for radially fixing the roof bone rafter 9 are provided. Further, the lower portion of the roof frame rafter 9 is also formed of a flat plate or a steel material having a planar structure so as to make surface contact with the membrane body 3. The ring plate 12 is placed on the film top portion 4 of the film body 3 that receives the air pressure on its inner surface in a well-balanced manner with a wide contact surface. Next, a plurality of roof bone rafters 9 are arranged on the membrane body 3 in a radially balanced manner so as to make surface contact, and the side wall 2
The plurality of side brackets 8 provided on the inner edge of the upper end of the above and the plurality of center ribs 14 are radially passed between and fixed by bolts or the like. In this case, the roof bone 10 is the membrane body 3 that has received internal pressure.
In the state in which the load is supported on the center, the center side of the center roof bone centering 7 and the roof bone rafter 9 are supported at a position higher than the steel roof shape position. After the roof bone 10 is assembled and fixed, if the internal pressure is lowered to make the load not supported by the membrane body 3, the roof bone naturally descends due to its own weight and becomes self-supporting in an arch shape, and is placed at a predetermined height position of the dome-shaped roof. Is set. According to the above-mentioned construction method, the roof bone rafter 9 and the like are held by the membrane body 3 during construction, and therefore, unlike the conventional case, they do not support their own weight during assembly or receive stress during temporary assembly. It is not necessary to use a robust structure that can withstand an excessive load and stress during construction, use an unnecessarily strong member, or separately provide a supporting member. Although not shown, a ring plate is also provided at the upper end portion of the vertical ring plate 13 of the roof bone centering 7 as necessary, such as when the roof has a large diameter, to prevent the tensile force and compression force of the radial roof bone. Make a strong structure.

FIG. 6 is an explanatory view in which a part of the structure of the side bracket portion according to the present invention used for constructing a steel roof for covering the upper portion of the storage tank is omitted. The side bracket 8 is
A protection member 16 is provided on the inner edge of the upper end of the side wall 2, and at the lower end of the side bracket 8 in a face-to-face structure. The film body attachment portion 5 is provided with, for example, a film attachment ring member 15 or the like below the upper side edge of the side wall 2 below the side bracket 8 to hermetically fix the outer peripheral edge of the film body 3. At this time, the edge of the film body 3 is
As shown in the figure, it is formed so as to extend along the inner peripheral edge of the side wall 2 and to be in close contact with the wall surface so that airtightness can be more easily maintained. The inside of the storage tank body covered with the membrane 3 is swelled when the roof bone 10 is installed on the membrane 3 while maintaining the membrane zenith 4 at a position higher than the roof shape position by air pressure. Membrane 3
Since the vicinity of the outer peripheral edge is protected by the protection member 16 having the above-described surface contact structure and does not directly contact the lower end of the side bracket 8, it is not damaged. Further, the protective member 16 is formed by bending the lower end portion of the side bracket 8 or by separately bending a curved flat plate or the like so as to uniformly abut on a wide surface corresponding to the shape and inclination of the surface of the film body 3. Formed by attaching to the lower end.

[0020]

According to the steel roof construction method of the present invention, since the steel roof frame is assembled and fixed with bolts or the like while being in surface contact with the film body at the time of construction and supporting the load thereof, the conventional roof frame structure is used. It is economical because it does not have to have a robust structure that can withstand overload and overstress during construction, and does not require the use of extra strength members or support members, reducing the strength and weight of the roof bone. The steel roof can be made. Further, in the steel roof construction method according to the present invention, after introducing air into the storage tank main body under the membrane, the roof bone centering is placed on the zenith portion of the membrane so that the roof bone is positioned higher than the steel roof shape position. By holding the roof bone centering and arranging the roof bone rafter on the membrane body, and then using the membrane body for the support and the scaffold, the assembly work of the roof bone is safe, efficient and economical. Can be done. In other words, the roof bone rafter was passed between the roof bone centering placed on the zenith of the membrane and the side brackets provided above the side wall inner peripheral edge membrane attachment to support the roof bone load with the membrane. The work of assembling and fixing with a bolt etc. in a state can be safely and efficiently supported by maintaining a balance on the film body. Further, the membrane zenith can maintain a position higher than the roof-shaped position, and the roof bone can be assembled and formed at a position higher than the roof-shaped position. Therefore, it is possible to release the air pressure, let the roof bone naturally descend by its own weight, and make it stand in an arch shape, and finally fix it according to the predetermined roof shape and height position with the entire roof load applied. it can. Further, the film body used for constructing the steel roof is easy to remove and reuse, which is economical.

Further, in the membrane used in the steel roof construction according to the present invention, the roof bone centering mounting portion of the membrane zenith at the time of air pressure is formed in a shape protruding from the roof-shaped position. , It is possible to easily maintain the roof bone centering placement position of the membrane zenith higher than the roof shape position, and when the roof bone centering is placed on the zenith of the membrane or when the roof bone is assembled. The predetermined position can be maintained without sinking the roof bone centering placement portion due to the load. Further, the film body can be fixed at a position lower than the mounting position of the side bracket on the inner edge of the upper end of the side wall so that the film body zenith can be maintained at a predetermined position higher than the roof-shaped position. Therefore, the side bracket does not interfere with the attachment of the membrane, and the membrane can be attached safely and easily and the roof bone can be installed on the membrane.

The upper part of the storage tank is covered with a film using air pressure, and the roof bone centering is placed on the top of the film to form a roof bone. Since the ring plate that makes surface contact with the membrane according to the present invention is provided in the lower portion, it is safe without damaging the surface of the membrane when the roof bone centering is placed on the membrane. In addition, since the above-mentioned ring plate abuts on the membrane in a wide area, the load of the roof bone centering is evenly received, and the membrane does not largely sink and is stable. Also, when the load of the temporarily fixed roof bone is taken up by the zenith of the membrane body, it can be received evenly on the abutment surface of the roof bone centering to maintain balance and support without tilting, so it is safe. The roof bone can be assembled and constructed efficiently. In addition, since the protective member which is in surface contact with the film body according to the present invention is provided at the lower portion of the side bracket provided above the inner peripheral wall film body attachment portion of the storage tank, the film body is provided on the protruding portion at the lower end of the side bracket. Does not come in contact with or rub against to damage it. Further, since the film body comes into uniform contact with the protective member, it is possible to maintain a predetermined shape without being locally deformed.

[0023]

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view in which the steel roof construction method according to the present invention is partially omitted, showing a state in which a membrane is attached and air pressure is introduced.

FIG. 2 shows a state where the roof bone is assembled and fixed on the membrane body, following FIG.

FIG. 3 shows a state in which the air pressure is lowered and the support of the membrane body is released to make the roof bone self-supporting, following FIG.

FIG. 4 shows a state in which, following FIG. 3, the film body is removed and a roof plate is applied to form a roof-shaped position at a predetermined height.

FIG. 5 is an explanatory view with a part omitted showing a mounting structure of a roof bone centering according to the present invention, which is used for construction of a steel roof for covering an upper part of a storage tank.

FIG. 6 is an explanatory view in which a part of the structure of a side bracket portion according to the present invention used for construction of a steel roof covering the upper part of the storage tank is cut away.

[Explanation of symbols]

1 Bottom Wall 9 Roof Bone Rafter 2 Side Wall 10 Roof Bone 3 Membrane 11 Roof Plate 4 Membrane Zenith 12 Ring Plate 5 Membrane Attachment 13 Vertical Ring Plate 6 Blower 14 Center Rib 7 Roof Bone Centering 15 Membrane Attachment Ring Member 8 Side Bracket 16 Protective material

Claims (3)

[Claims] 1. An upper part of a storage tank is covered with a membrane body in which the membrane body zenith is kept higher than a roof shape position by air pressure, and roof bone centering is placed on the membrane zenith, and the roof bone centering is placed on the membrane body. A steel roof characterized in that a roof bone is formed by connecting and fixing a roof bone rafter in surface contact with the membrane between the roof bone centering and a side bracket provided above the sidewall inner peripheral edge membrane attachment portion. Construction method. 2. A membrane used for construction of a steel roof in which the upper part of the storage tank is covered with a membrane using air pressure, and roof bone centering is placed on the zenith of the membrane to form a roof bone. When the pressure is applied, the roof bone centering placement location on the zenith of the membrane is
A member used for steel roof construction, characterized in that it is formed in a shape protruding from the roof shape position. 3. A roof bone centering for use in the construction of a steel roof in which the upper part of the storage tank is covered with a film using air pressure, and roof bone centering is placed on the zenith of the film to form a roof bone. A ring plate that is in surface contact with the film body is provided in the lower portion, and a protective member that is in surface contact with the film body is provided in the lower portion of the side bracket provided above the inner peripheral edge film body attachment portion of the storage tank. Material used for steel roof construction.