JPH08303061A - Method of building membrane type roof - Google Patents

Abstract

PURPOSE: To facilitate the opening and closing of a membrane type roof after building thereof by supplying air into inflatable air beams, and by engaging joint wires which are being arranged crossing one another, together so as to prevent the membrane type room from falling down sidewise so that the roof is built while the air beams are moved. CONSTITUTION: A plurality of carrier bogeys 7 are arranged on the upper parts 3a of opposite side walls of a structure, along one end part to the other end part of a lower structure. Then, opposite end parts of an air beam 8 are attached in a deflated condition to the carrier bogeys 7 on the rear end side of the structure. Then, air is fed into the air beam 8 which is therefore inflated. In this case, a member adapted to be engaged with the air beam 8 during inflation of the latter so as to prevent the air beam 8 from falling down sidewise, is attached to the air beam 8, being crossing the latter. Next, the adjacent air beams 8 are coupled together by means of bellows sheet members, and thereafter, the air beam 8 located at the front end of the structure is moved to the front end in order to stretch and extend the bellows sheet member.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for constructing a membrane roof.

[0002]

2. Description of the Related Art As a roof of a large-scale facility having a membrane structure, generally, an air tube structure roof, an air film temporary roof for structurally maintaining an air film due to a pressure difference between the inside and the outside, and the like are known. There is. However, since the air tube structure roof and the temporary air film roof both use a large amount of air, it takes a lot of time and effort to construct and dismantle the film roof, and these film roofs can be opened and closed. Since it is difficult, for example, when it is used for a temporary roof for construction work, there are various inconveniences such that the material cannot be put in and out of the building from the roof.

Therefore, in order to eliminate such inconvenience, the present applicants have previously proposed a method for constructing a membrane roof described in Japanese Patent Application No. 6-4275. In this membrane roof construction method, an air supply pipe is installed on one side wall of the lower structure along one end to the other end of the lower structure. Also,
A plurality of air beams, one end of which is connected to the air supply pipe, are arranged in parallel along the longitudinal direction of the air supply pipe at equal intervals, and adjacent air beams are connected by a sheet material. It is temporarily placed on the upper surface of one side wall of the lower structure while being contracted in the axial direction.

Further, guide wires for guiding the expansion and contraction of the air beams are installed in a deflated state between both side walls of the lower structure body according to the number of the air beams. And by supplying air from the air supply pipe to each air beam in this state, each air beam is extended along the guide wire to form the air beam and the sheet material in an inflated form,
Then, the other end of each air beam is attached to the upper portion of the other side wall of the lower structure. A joint wire that engages with an inflated air beam to prevent the membrane roof from falling over is attached so as to cross the air beam. This allows
A membrane roof is built.

In such a membrane roof construction method, since the membrane roof is constructed by supplying air to a small-diameter cylindrical air beam, the amount of air used when constructing the membrane roof is small. As a result, the membrane roof can be easily constructed and disassembled. Further, after removing the other end of each air beam from the other side wall of the lower structure, the membrane roof can be opened by removing the air in each air beam and shrinking the air beam together with the sheet material. When used as a temporary roof for construction work, the material can be easily put in and taken out from the roof.

[0006]

However, in such a method for constructing a membrane roof, the installation work of the air supply pipe, the installation work of the air beams, the work of connecting each air beam with the sheet material, the installation work of the guide wire, etc. are the substructures. Since the work spans the entire body from one end to the other, it takes a lot of time and effort to set up each work, and inflate each air beam by supplying air to all air beams from the air supply pipes at the same time. It takes a lot of time to supply such air because it is formed into a shape.

Further, when opening and closing the membrane roof after the construction of the membrane roof, it is necessary to supply and extract air to each air beam every time the membrane roof is opened and closed, which requires a great deal of time and effort for opening and closing the membrane roof. It takes time. The present invention has been made to solve such inconvenience, and provides a membrane roof construction method capable of performing a construction work quickly and easily and opening / closing the membrane roof after construction in a short time. The purpose is to do.

[0008]

In order to achieve the above object, the method for constructing a membrane roof according to claim 1 is a method for constructing a membrane roof on an upper portion of a lower structure, wherein the lower structure is A moving body installation step of installing a plurality of moving bodies that can move from one end of the body to the other end on the upper portions of both side walls of the lower structure; A cylindrical body mounting step of mounting one end of the structure to a moving body installed on both side walls of the lower structure, and supplying a fluid to the inside of the cylindrical body to inflate the cylindrical body from a deflated shape. In the tubular body, a horizontal supply preventing member is provided to prevent the membrane roof from falling sideways by engaging with the tubular body during the fluid supply step of forming the tubular shape and the process of forming the tubular body in the inflated shape. The horizontal fall prevention member attaching step of crossing and attaching the tubular bodies adjacent to each other. A cylindrical body connecting step of connecting the movable body with a sheet material that can expand and contract in the moving direction of the moving body, and after connecting the cylindrical bodies with the sheet material in the cylindrical body connecting step, And a sheet material stretching step of moving the tubular body located on the end side to the other end side to stretch the sheet material.

The membrane roof construction method according to claim 2 is characterized in that the fluid supplied to the inside of the tubular body is air. Here, the upper side wall of the lower structure means not only the upper end surface of the side wall of the lower structure, but also the ground near the upper end surface of the side wall of the underground structure when the lower structure is an underground structure. .

As the cylindrical body, a synthetic rubber tube or the like which is excellent in flexibility, airtightness and durability is preferable. As the stretchable sheet material, for example, a bellows sheet or the like can be adopted, and as the material of the sheet material, polyvinyl acetate-based, polyester-based, polyamide-based, etc. synthetic fibers or metals such as glass fibers or stainless steel fibers are used. A woven fabric made of fibers may be coated with a coating material such as vinyl chloride resin, synthetic rubber or fluororesin.

When the membrane roof is constructed as a roof of a permanent building, a non-combustible and highly durable tetrafluoroethylene resin-coated glass fiber woven fabric or the like is preferable as a material for the sheet material. In the case of constructing a roof of a temporary building, it is preferable that the sheet material is, for example, an inexpensive synthetic fiber woven cloth coated with vinyl chloride resin.

The fluid supplied to the tubular body includes not only gas such as air but also granular polymer material such as polystyrene grains which flows in the tubular body. When a granular polymeric material is used as the fluid, the granular polymeric material is supplied to the tubular body to stretch the tubular body, and then the polymeric material in the tubular body is once melted and then stretched. It is recommended to re-solidify it into the same shape as the tubular body to make the tubular body a beam with excellent strength and apply it to the construction of a membrane roof of a permanent building.

Further, the cylindrical body may be filled with a thermosetting resin in a melted state and heated and cured by a heating means such as a heater to form the cylindrical body as a beam having excellent strength.

[0014]

According to the first aspect of the present invention, the work of mounting the tubular bodies and the work of connecting the tubular bodies with the sheet material are performed on one end side of the lower structure, and then located on the other end side of the lower structure. By moving the tubular body to the other end side and extending the sheet material, the work of constructing the membrane roof can be performed sequentially from one end to the other end of the lower structure, and the setup of each work can be performed. make it easier.

Further, by performing the operation of supplying the fluid into the plurality of tubular bodies for each tubular body which is sequentially attached from one end portion to the other end portion of the lower structure, all the tubular bodies can be formed as in the conventional case. The work of supplying the fluid to the body is not required at the same time, and the guide wires, which have been conventionally required, are eliminated by attaching both ends of the tubular body to the moving bodies installed on both side walls of the lower structure.

Further, after the membrane roof is constructed, the membrane roof is opened and closed by moving the membrane roof along the upper side wall between one end and the other end of the lower structure. Claim 2
According to the invention of claim 1, in addition to the invention of claim 1, the fluid supplied to the inside of the cylindrical body is air, whereby the supply of the fluid to the cylindrical body is facilitated and the cost of the fluid is reduced. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory perspective view for explaining a membrane roof construction body constructed by a membrane roof construction method according to an embodiment of the present invention, FIG. 2 is a detailed cross-sectional view of an upper side wall of a steel frame structure, and FIG. 4 is a detailed sectional view of the other side wall upper portion of the steel structure, FIG. 4 is an explanatory view for explaining an end mounting structure of the air beam, FIG. 5 is a sectional view taken along the line AA of FIG. 1, and FIG. 7 is an explanatory schematic perspective view for explaining the air beam mounting step and the joint wire mounting step, and FIG. 8 is an explanatory schematic perspective view for explaining the air supply step. 9 is an explanatory perspective view for explaining the air beam connecting step and the bellows sheet extending step, FIG. 10 is an explanatory perspective view for explaining a state in which the membrane roof is opened, and FIG. 11 is B of FIG. It is a -B line sectional view.

First, a membrane roof construction body constructed by a membrane roof construction method according to an embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 is a steel frame structure (lower structure), and the steel frame structure 1 is constructed by a steel frame column 2 and a steel frame beam 3 into a substantially rectangular parallelepiped shape that is long in the front-rear direction. Steel beams 3 located on both sides of the upper part of the steel structure 1.
Temporary walkways 4a and 4b are attached to the outside of a and 3b along the steel beams 3a and 3b, respectively. Steel beam 3
The a and 3b are connected by a plurality of steel frame beams 3c arranged at a predetermined interval in the longitudinal direction of the steel frame structure 1. In this embodiment, the membrane roof building structure 5 is built on the upper portion of the steel frame structure 1.

The membrane roof construction body 5 has, as its basic structure, a temporary rail 6, a traveling carriage (moving body) 7, an air beam (cylindrical body) 8, a bellows sheet (sheet material) 9 and a sideways prevention member 10. Prepare As shown in FIGS. 2 and 3, the temporary rails 6 are laid parallel to the inside of the steel beam 3a and the upper surface of the steel beam 3b along the steel beams 3a and 3b, respectively. With.

The rail body 11 is made of, for example, H-shaped steel,
The rail main body 11 on the side of the steel frame beam 3a is mounted on the steel frame beam 3c at a position inside the steel frame beam 3a, and the lower flange portion 11a is detachably fixed to the steel frame beam 3c with bolts and nuts 12. On the other hand, the rail body 11 on the steel beam 3b side
Is mounted on the upper surface of the steel beam 3b, and the lower flange portion 1
1a is detachably fixed to the steel beam 3b by bolts and nuts 12.

The upper flange portion 11b of the rail body 11
A pair of guide rails 13 made of grooved steel are provided on both sides of the
Are arranged along the rail body 11 with the grooves 13a facing each other. The lower portion of the guide rail 13 is fixed to the back surface of the flange portion 11b by welding or the like. A plurality of traveling carriages 7 are arranged in the longitudinal direction of the temporary rail 6, and the flange portion 11b of the rail body 11 is provided.
A pair of wheels 15 that can travel in a space 14 surrounded by the groove portion 13a of each guide rail 13 along the upper surface of the flange portion 11b.

The pair of wheels 15 are attached to a wheel mounting base 16, and an extending portion 17 extending upward is formed at the center of the mounting base 16. An air beam fixture 18 into which an end portion of an air beam 8 to be described later is inserted and fixed is provided at an upper end portion of the extending portion 17. Air beam fixture 1
8 is formed in a cylindrical shape with a bottom, and the tip opening is a steel frame structure 1
It is directed diagonally upward and inward in the lateral direction. Bolt holes 18a are formed on the outer peripheral wall of the air beam fixture 18 in the circumferential direction.
They are formed apart from each other by 0 °.

The air beam 8 is made of, for example, a synthetic rubber tube having excellent flexibility, airtightness, and durability, and has column-shaped fixing portions 8a which are inserted and fixed to the air beam fixing member 18 at both ends. ing. The fixed portion 8a is the air beam 8
Is airtightly attached to. On the outer peripheral surface of the fixed portion 8a corresponding to the bolt hole 18a, screw holes 8b are formed 180 ° apart in the circumferential direction. A reinforcing cloth band 23 is appropriately wound around the outer periphery of the air beam 8 at a predetermined interval in the axial direction.

Further, as shown in FIG. 2, an air supply provided with a check valve is attached to the fixing portion 8a which is inserted and fixed in the air beam fixing member 18 of the traveling carriage 7 traveling on the temporary rail 6 on the steel beam 3a side. A mouth 19 is provided. The air supply port 19 communicates with the inside of the air beam 8, and the flexible hose 20
One end of is detachably connected. Flexible hose 2
The other end of 0 is connected to an air compressor 21 placed on the upper surface of the steel beam 3a. Air is supplied into the air beam 8 from the air supply port 19 by driving the air compressor 21, and the air beam 8 is inflated by the supply of the air. The air beam 8 when inflated
In this embodiment, the shape of is formed as an arch, but the shape is not limited to this.

As shown in FIG. 5, a connecting sheet 24, to which the bellows sheet 9 is connected, extends along the axial direction 9 of the air beam 8 on the upper side of the air beam 8. The connecting sheet 24 is made of a flexible material such as vinyl chloride and has a substantially mountain-shaped cross section and is fixed to the reinforcing cloth band 23. As shown in FIG. 4, the air beam 8 having such a configuration has fixing portions 8a attached to both ends thereof inserted into the air beam fixing members 18 of the traveling carriages 7 on the steel beam 3a and 3b sides, respectively, and then the bolt holes 18a and the screw holes 18a are screwed. It is fixed to the air beam fixture 18 by screwing the bolt 22 with the hole 8b aligned.

The bellows sheet 9 is for connecting the air beams 8 adjacent to each other to form the membrane roof M, and is arranged so as to be expandable and contractable in the longitudinal direction of the steel frame structure 1. As the material of the bellows sheet 9, for example, a woven fabric made of polyvinyl acetate synthetic fiber coated with vinyl chloride resin is used. The length of the bellows sheet 9 (length in the lateral direction of the steel frame structure 1) is substantially the same as the length of the air beam 8 in the axial direction.

Then, as shown in FIG. 5, the bellows sheet 9 is formed.
The left side portion of the bellows sheet 9 is connected to the right side portion of the connecting sheet 24 of the left side air beam 8 among the adjacent air beams 8 by a bolt or a magic tape (both not shown). Is the air beam 8 on the right
Is connected to the left side portion of the connecting sheet 25 by means of bolts or magic tape (both not shown). still,
At the time of such connection, in order to prevent rainwater and the like from entering from the connection portion, it is preferable to interpose a rubber packing or the like for connection.

The lateral collapse prevention member 10 is for preventing the lateral collapse of the membrane roof M by engaging with the air beam 8 in the process of forming the air beam 8 in an inflated shape, and FIGS. As shown in FIG. 3, the steel beams 3c on the most front end side of the steel frame structure 1 are provided on the columns 25a and 25b which are erected so as to be spaced apart from each other in the lateral direction of the steel frame structure 1, and on the most rear end side steel beam 3c. Supports 25c and 2 erected upright to support supports 25a and 25b
5d.

Between the columns 25a and 25c and between the columns 2
Joint wires 26 are bridged between the 5b and the column 25d. The joint wire 26 is
As shown in FIG. 5, the air beam 8 is inserted through the ring 24a formed on the top of the connecting sheet 24 and the ring 9a formed on the bellows sheet 9, whereby the joint wire 26 is engaged with the air beam 8. Prevent the membrane roof M from falling over.

Next, a method for constructing a membrane roof which is an embodiment of the present invention will be described. This membrane roof construction method includes a traveling vehicle installation step, an air beam attachment step, an air supply step, a joint wire attachment step, an air beam connection step, and a bellows sheet extension step. Hereinafter, each step will be described in detail. [Traveling vehicle installation process] First, as shown in FIGS. 2, 3 and 6, after the temporary rails 6 are mounted on the insides of the steel beams 3a and 3b, respectively, the bottom of the rail main body 11 of each temporary rail 6 is mounted. The side flange portion 11a is detachably fixed to the steel beam 3c with bolts and nuts 12.

Next, the flange portion 11 of the rail main body 11
The wheel 15 of the traveling carriage 7 is inserted into the space 14 surrounded by b and the groove portion 13a of each guide rail 13
5 is placed on the upper surface of the flange portion 11b of the rail body 11. In this way, a plurality of traveling carriages 7 are installed along the temporary rails 6 laid on the steel beam 3a and 3b sides, respectively. In such installation, a plurality of traveling carriages 7 are arranged on the rear end side of the steel frame structure 1.

[Air Beam Mounting Step] As shown in FIGS. 2, 3 and 7, of the plurality of traveling carriages 7 installed on the temporary rail 6 on the side of the steel frame beam 3a, the rearmost end side of the steel frame structure 1 is installed. The fixing portion 8a on one end side of the deflate-shaped air beam 8 is inserted and fixed to the air beam fixing tool 18 of the traveling carriage 7 located at, and the plurality of traveling carriages 7 installed on the temporary rail 6 on the steel beam 3b side are fixed. The fixing portion 8a on the other end side of the air beam 8 is inserted into and fixed to the air beam fixing tool 18 of the traveling carriage 7 located on the rearmost side thereof. The traveling carriage 7 located at the most rear end side of the steel frame structure 1 is restricted from traveling by a stopper or the like not shown.

[Air Supply Step] After the air beam 8 is deflatedly attached to the most rear end side of the steel frame structure 1 in the air beam attaching step, as shown in FIGS. 2 and 7, the air beam fixing tool on the steel beam 3a side. The flexible hose 20 is connected to the air supply port 19 of the fixed portion 8 a inserted in the unit 18. Next, the air compressor 21 is driven to supply the air into the air beam 8 from the air supply port 19 to form the air beam 8 in an inflated shape as shown in FIG. Here, when the air beam 8 is formed in an inflated shape, an upward pulling force is applied to the wheels 15 of the traveling carriage 7, but this pulling force is received by the wheels 15 hitting the upper portions of the guide rails 13, and as a result, The traveling vehicle 7 is ensured to travel smoothly. Incidentally, the traveling carriage 7
In order to ensure smoother running, the wheel 15 may have a built-in bearing structure or the like.

[Joint Wire Attaching Step] As shown in FIGS. 1 and 7, joint wires 26 are stretched between the columns 25a and 25c and between the columns 25b and 25d, respectively. [Air Beam Connecting Step] After forming another air beam 8 on the front end side of the air beam 8 formed in the inflated shape on the most rear end side of the steel frame structure 1 according to the above-described air beam attaching step and air supply step, The air beams 8 are connected by connecting both side portions of the bellows sheet 9 in the contracted state to the connecting sheets 24 of the adjacent air beams 8 with a bolt or a magic tape or the like. The ring 24 a formed on the connecting sheet 24 and the ring 9 a formed on the bellows sheet 9 are attached to the joint wire 26.

[Step of extending bellows sheet] After connecting the air beams 8 with the bellows sheet 9, as shown in FIG.
The air beam 8 located on the front end side is moved to the front end side to extend the bellows sheet 9. Such movement is performed by the traveling carriage 7 to which the air beam 8 is attached traveling on the temporary rail 6. Hereinafter, the membrane roof M shown in FIG. 1 is constructed by sequentially repeating the air beam attaching step, the air supplying step, the air beam connecting step, and the bellows sheet extending step on the front end side of the air beam 8.

After the construction of the membrane roof M, as shown in FIGS. 10 and 11, the membrane roof M is pulled toward the rear end side of the steel frame structure 1 to shrink the bellows sheet 9 and thereby the membrane roof M.
With the open state, materials and the like are carried in and out from the upper portion of the steel frame structure 1. In such a method for constructing a membrane roof, the work of attaching the air beam 8 and the work of connecting the air beams 8 with the bellows sheet 9 are performed on the rear end side of the steel frame structure 1, and then the air beam located on the front end side of the steel frame structure 1. Since the bellows sheet 9 is extended by moving 8 to the front end side, the work of constructing the membrane roof M can be sequentially performed from the front end portion to the rear end portion of the steel frame structure 1, and as a result, The work setup is easier than in the past, and the construction work of the membrane roof can be performed quickly.

Further, since the work of supplying the air to the plurality of air beams 8 is carried out for each of the air beams 8 sequentially attached from the front end portion to the rear end portion of the steel frame structure 1, as in the conventional case, all the air beams 8 are It is possible to eliminate the work of supplying air to 8 at the same time, and as a result, the air supply pipe, which has been conventionally required, becomes unnecessary, and the work can be set up more easily.

Further, both ends of the air beam 8 are deflated on the traveling carriages 7 installed on both side walls of the steel structure 1, and then air is supplied to the air beam 8 to form an inflated shape. Therefore, it is possible to eliminate the need for the guide wire, which has been conventionally required. Furthermore, after the membrane roof is constructed, the membrane roof M can be opened and closed by moving the membrane roof M along the temporary rail 6 between the front end portion and the rear end portion of the steel frame structure 1. The membrane roof M can be opened and closed easily and in a short time.

Further, since the fluid supplied to the inside of the air beam 8 is air, the fluid can be easily supplied to the air beam 8 and the cost of the fluid can be reduced. Further, the air beam 8 to the air beam fixture 18
To attach the air beam 8 to the air beam fixture 18 with a simple structure, all that is required is to insert the fixing portion 8a into the air beam fixture 18 and screw in the bolt 22 and to remove it simply loosen the bolt 22. Easy to do.

In the above embodiment, the case where the membrane roof M is constructed on the skeleton on the ground is taken as an example, but the construction is not necessarily limited to this, and it may be constructed as a membrane roof on the underground skeleton. In the above embodiment, the deflated air beam 8 is attached to the air beam fixture 18, and then air is supplied into the air beam 8 to form an inflated shape. However, this is not always necessary. Alternatively, the inflated air beam 8 supplied with air in advance may be attached to the air beam fixture 18.

[0041]

As is apparent from the above description, according to the invention of claim 1, the work for constructing the membrane roof can be sequentially performed from one end portion to the rear end portion of the lower structure. As compared with the conventional method, the setup of each work is simplified, and the effect that the construction work of the membrane roof can be performed quickly is obtained.

Further, since it is possible to eliminate the work of supplying the fluid to all the cylindrical bodies at the same time as in the conventional case, the air supply pipe, which has been conventionally required, becomes unnecessary, and the work can be set up more easily. The effect of being able to do is obtained.
Furthermore, since both ends of the tubular body are deflated to the moving bodies installed on the both side walls of the lower structure, the effect of being able to eliminate the conventionally required guide wire can be obtained. .

Further, after the membrane roof is constructed, the membrane roof can be opened and closed by moving the membrane roof between one end and the other end of the lower structure, so that the membrane roof can be easily opened and closed. Moreover, the effect that it can be performed in a short time is obtained. According to the invention of claim 2, in addition to the invention of claim 1, the fluid supplied to the inside of the tubular body is air, thereby facilitating the supply of the fluid to the tubular body and The effect that the cost of can be reduced can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view for explaining a membrane roof construction body constructed by a membrane roof construction method according to an embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view of an upper portion of one side wall of the steel frame structure.

FIG. 3 is a detailed cross-sectional view of the upper portion of the other side wall of the steel frame structure.

FIG. 4 is an explanatory diagram for explaining an air beam end mounting structure.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an explanatory schematic perspective view for explaining a traveling vehicle installation step.

FIG. 7 is an explanatory schematic perspective view for explaining an air beam attaching step and a joint wire attaching step.

FIG. 8 is an explanatory schematic perspective view for explaining an air supply step.

FIG. 9 is an explanatory schematic perspective view for explaining an air beam connecting step and a bellows sheet extending step.

FIG. 10 is an explanatory perspective view for explaining a state where the membrane roof is opened.

11 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel structure (lower structure) 5 ... Membrane roof structure 7 ... Traveling vehicle (moving body) 6 ... Temporary rail 8 ... Air beam (cylindrical body) 9 ... Bellows sheet (sheet material) 18 ... Air beam fixture 19 ... Air supply port 20 ... Flexible hose 21 ... Air compressor 25a to 25d ... Strut (sideways prevention member) 26 ... Joint wire (sideways prevention member)

Claims (2)

[Claims] 1. A membrane roof construction method for constructing a membrane roof on an upper portion of a lower structure, wherein a movable body movable from one end to the other end of the lower structure is provided on both sides of the lower structure. A step of installing a plurality of movable bodies on the upper part of the wall, and a cylindrical shape in which both ends of the cylindrical body to which the fluid is supplied are attached to the movable bodies installed on both side walls of the lower structure at one end side of the lower structure. A body attaching step, a fluid supplying step of supplying a fluid to the inside of the tubular body to form the tubular body from a deflated shape to an inflated shape, and a process of forming the tubular body into an inflated shape. A horizontal fall prevention member attaching step of attaching a horizontal fall prevention member that engages with the tubular body to prevent the membrane roof from falling sideways and attaches the horizontal fall prevention member to the tubular body; A tubular body connecting step of connecting with a sheet material that can expand and contract in the moving direction of the body, After connecting the tubular bodies with the sheet material in the tubular body connecting step, the tubular body located on the other end side of the lower structure is moved to the other end side to extend the sheet material. A method for constructing a membrane roof, comprising: a sheet material extending step. 2. The method for constructing a membrane roof according to claim 1, wherein the fluid supplied to the inside of the tubular body is air.