JPH08291645A - Membrane roof structure - Google Patents

Abstract

PURPOSE: To provide a membrane roof structure on which fallen snow slides easily. CONSTITUTION: A membrane roof structure is constituted of fixed roofs 1, 1a and a pair of movable roofs 2. The roof faces of the fixed roofs 1, 1a and the movable roofs 2 are respective made of double-pitch roofs which are inclined from the ridge as the top to both sides. At the ridge forming the top of the fixed and movable roofs, a snow divider 3 is extended along the extending direction of the ridge. Membrane panels are spread between upper chords of the roof beams extending along the roof inclination and provided with a V-shaped valley in the section, at the center extending along the roof inclination. The central part of curtain panel between upper chords is pulled down from the lower side to the lower chord side to form the valley-shape of the membrane panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane roof structure having a skeleton membrane structure which constitutes the roof of a building such as a dome having a large frame space.

[0002]

2. Description of the Related Art As a conventional membrane roof structure, for example, there is one disclosed in Japanese Patent Publication No. 4-36233.
In this membrane roof structure, a plurality of pressing cables are arranged along the roof surface, and a membrane panel is stretched between the cables, and the joint portion of the membrane panels is supported by the cable, whereby It has a roof shape.

A cable 54 at the joint of the membrane panel 50.
As shown in FIG. 15, the attachment structure to each membrane panel 5 is
The membrane end plate 51 is previously wrapped along the joint edge of No. 0, and the base edge of the fluid-tight holding membrane 52 is welded to the upper surface of the joint end. Then, the bonded end portions of the pair of membrane panels 50 to be bonded are drawn to the bonded position by using the above-mentioned wrapped film end plate 51, and each film panel 5 is joined.
The above-mentioned membrane end plate 51 provided at 0 is sandwiched by a pair of joint plates 53 from above and below. In addition, the cable attachment member 55 is provided at predetermined intervals with respect to the cable 54.
, And a joint plate mounting bolt 56 that stands upright from the mounting member 55 so that the central portion of the joint plate 53 is penetrated from below and the bolt 5
The membrane panels 50 are joined to each other by screwing a nut onto the upper end portion of 6 to tighten them. Further, a fluid-tightness holding film 52 having a base edge welded to the upper surface of the joint end portion of the same film panel 50.
The respective tip portions of are welded to cover the above-mentioned tightly bound portion. Reference numeral 57 is a film material protection rubber sheet.

After laying the roof membrane as described above,
When air is enclosed and pressurized in the building, the membrane panel 50 is pressed upward and initial tension is introduced. As a result, the portion where the cable 54 is attached forms the trough of the membrane panel 50. Further, as described in Japanese Patent Laid-Open No. 4-371716, a pressing cable is arranged on the upper side of the membrane panel, and the membrane panel is pressed downward by the cable, whereby the initial tension is applied to the membrane panel 50. Introduced. As a result, the portion of the membrane panel 50 with which the cable 54 abuts becomes a valley.

[0005]

However, in the conventional membrane roof structure as described above, a protruding portion such as a cable is provided above the valley position formed in the membrane panel 50. Therefore, when snow accumulates on the roof surface due to snowfall, slipping of the snow is prevented at the valley position where the protrusion is formed, and the snow load on the roof surface may increase.
This means that the membrane roof is required to have a structure that is strong enough to receive the snow load.

Further, in the method disclosed in Japanese Patent Publication No. 4-36233, the valley is not always formed along the direction of the roof flow, and snow may be further accumulated on the roof. When the roof surface is covered with snow, the membrane panel 50 has a structure in which the cable 54 supports the membrane panel 50, so that the roof surface may be bent downward more than an allowable amount. Further, in the one described in the above-mentioned JP-A-4-371677, by extending the presser cable in the flow direction of the roof, a valley on the roof surface is formed along the flow direction. As the frame becomes larger, it becomes necessary to provide a buckling prevention material extending above the membrane panel in a direction orthogonal to the above flow, and the buckling prevention material together with the cable becomes a factor that hinders the sliding of snow. .

As described above, in the conventional membrane roof structure as described above, there is a possibility that the snow accumulated on the roof surface may not slip off, and there is a problem that it is difficult to use in a snowy area. The present invention
The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a membrane roof structure in which snow falls easily.

[0008]

In order to achieve the above object, a membrane roof structure according to claim 1 of the present invention comprises a main girder extending along or parallel to a ridge and a membrane panel. In the membrane roof structure in which the roof surface is formed by the roof structure, the roof structure is a double-flow structure with the ridge at the top, and the truss structure is installed between the main girder and the eaves along the roof flow direction. A plurality of roof beams are arranged in a direction orthogonal to the flow of the roof, a membrane panel is stretched between the upper chord members of adjacent roof beams, and the central portion of the membrane panel between the upper chord members is the above. The feature is that it is a valley that is depressed along the direction of the roof flow.

Further, the invention described in claim 2 is different from the structure described in claim 1 in that the slope of the membrane panel between the upper chord members in the direction orthogonal to the flow of the roof is set to the main girder side and the eaves. It is characterized by a gentle slope on the side and a steep slope on the middle part between the main girder side and the eaves side. Further, the invention described in claim 3 is, in contrast to the configuration described in claim 1 or claim 2, that the valley position of the membrane panel is clamped from below and the clamped portion is used as the lower chord member of the roof beam. It is characterized by comprising a tension rod that can be pulled toward.

Further, in the invention described in claim 4, in contrast to the structure described in any one of claims 1 to 3, the compression member which sandwiches the valley position of the membrane panel from below and extends downward is provided. And a tension member that connects the lower portion of the compression member and the upper chord member of the roof beam, and a tension rod that can pull the compression member toward the lower chord member of the roof beam.

In addition, the invention described in claim 5 is characterized in that, in addition to the structure described in claims 1 to 4, a snow crack is provided on the ridge along the ridge. Further, the invention described in claim 6 is from claim 1 to claim 5.
In contrast to the configuration described in, a fixed roof with an opening,
In a membrane roof structure having a movable roof that is capable of opening and closing the opening of the fixed roof and movable in the extension direction of the ridge, both the fixed roof and the movable roof have a double-flow structure with the ridge at the top. Is characterized by.

Further, in the invention described in claim 7, in addition to the structure described in claim 6, the movable roof is composed of a single membrane panel, and the fixed roof is a double membrane of outer membrane and inner membrane. It is characterized in that the light transmittance of the membrane panel which is formed of a panel and which constitutes the fixed roof is higher than that of the membrane panel which constitutes the movable roof. In addition, the invention described in claim 8 is different from the configuration described in claim 6 or claim 7, in which the ridge position of the movable roof allows only rotation about the extension direction of the ridge. It is characterized by a structure.

[0013]

In the invention described in claim 1, since the roof structure has a double-flow structure with the ridge at the top, the snow accumulated on the roof slides down along each flow on each roof surface with the ridge as a boundary. It will be easier. Since it has been confirmed by experiments that the roof slope naturally slides down when the roof slope is about 25 degrees, it is preferable that the roof slope is 25 degrees or more.

Further, the roof surface of the upper chord member of the roof beam is
Since the mountain is formed along the roof flow, the mountain divides snow in a direction orthogonal to the roof flow. As a result, in the direction orthogonal to the flow of the roof, the tensile resistance acting on the snow becomes weaker, and the snow easily slides along the roof. Further, the main girder vertically supports the movable roof and the fixed roof, and the roof girder of the truss structure of the fixed roof serves to restrain the main girder from the side, so that horizontal deformation of the main girder can be suppressed. It is possible to construct a roof with a structurally rational structure.

Further, in the invention described in claim 2, since the slope of the membrane panel from the peak to the valley in the vicinity of the joint with the main girder or the eaves is made gentle, the main in the valley along the roof flow is reduced. It is possible to prevent the formation of snow pools at the uppermost position on the girder side and the lowermost position on the eaves side. In addition, by making a steep slope in the middle portion, the effect of dividing the snow cover with the mountain as a boundary is increased.

Further, the invention according to claim 3 shows means for making the gradient in the direction orthogonal to the roof flow in the membrane panel between the upper chord members steep. In the invention described in claim 3, since the trough position of the membrane panel is sandwiched from the lower side and pulled downward to form the trough on the membrane panel, as in the conventional case, the snow is slipped above the trough on the roof surface. The formation of interfering protrusions is avoided.

Further, since the roof beam has a truss structure, only by providing the roof beam, the upper chord member serving as the skeleton on the mountain position side and the lower chord member serving as the skeleton on the valley position side are arranged, and the above-mentioned membrane panel It is not necessary to separately provide a cable or the like for pulling and supporting the valley position downward. Further, the invention according to claim 4 shows a means for constructing a gentle gradient in the direction orthogonal to the roof flow in the membrane panel between the upper chord members.

Also in the invention described in claim 4,
Since the valley position of the membrane panel is sandwiched from the lower side and pulled downward to form the valley, it is possible to avoid the formation of the protrusion that obstructs the snow sliding on the upper side of the valley on the roof surface as in the conventional case. Further, when the above-mentioned gradient is made gentle, the snow load makes it easier for the membrane panel to bend downward between the valley position and the mountain position, particularly near the valley. When the membrane panel near the valley bends downward due to snow as described above, a downward load is applied to the compression member at the valley position, but the tension material that connects the lower part of the compression material and the upper chord material reduces the load. By receiving it, the trough position of the membrane panel is prevented from being displaced downward by a predetermined amount or more.

Since the tension member connects the lower portion of the compression member and the upper chord member, the tension member extends obliquely upward from the compression member and can apply an upward force to the compression member. ing. Further, in the invention described in claim 5, since the snow cracks are provided along the ridge, the snow accumulated on the roof is likely to be divided at the ridge, and tensile resistance acts on the snow at the ridge position. Instead, snow will easily slide down along the flow of each roof surface.

Further, according to the invention described in claim 6, even in the membrane roof structure having the movable roof, the flow directions of the fixed roof and the movable roof are the same, so the movable roof is slid down. The snow that has fallen onto the fixed roof will slide down along the flow of the fixed roof. In addition, claim 7
In the invention described in (1), the movable roof has a single membrane panel, and the fixed roof has a double membrane panel having higher light transmittance than the movable roof membrane panel. It is possible to make the interior of the room a uniform brightness space by making the brightness of the room and the brightness at the fixed roof position substantially uniform.

Even if the fixed roof has a double-layer structure, the movable roof can be made by using a member having a light transmittance higher than that of the movable roof used for the fixed roof. The brightness at the position and the brightness at the fixed roof position can be set to the same level. Further, in the invention described in claim 8, since the movable roof has a structure in which the left and right lower end portions sandwiching the ridge position are movable along the extending direction of the ridge,
The left and right lower end positions are regarded as a pin structure, and
Since the ridge position, which is the top of the movable roof, has a pin structure, the movable roof has a 3-hinge frame structure. As a result, it is possible to avoid that the movable roof is also deformed following the deformation of the lower structure, and an unreasonable load is applied to the carriage supporting the movable roof, the fixed roof side, or the like.

[0022]

An embodiment of the present invention will be described with reference to the drawings.
The membrane roof structure of the present embodiment includes a fixed roof 1 and a pair of movable roofs 2 as shown in FIG. 1 viewed from the extending direction of the ridge, FIG. 2 viewed from the side of the ridge, and FIG. There is. The fixed roof 1 and the movable roof 2 have both roof surfaces that are inclined to the left and right with the ridge as the top.

Further, at the position of the ridge which is the top of the fixed roofs 1 and 1a and the movable roof 2, a snow split 3 having a triangular cross-section with an upward convex vertical section extends along the extending direction of the ridge. It is set up. The fixed roofs 1 and 1a are fixed roofs 1 and
As shown in FIG. 3 in which 1a is viewed from above, a pair of main girders 4 and a plurality of roof beams 5 are constructed as a basic frame. In FIG. 3, a solid line extending vertically indicates the upper chord member of the roof beam, and a dash-dotted line extending vertically above the line P indicates a valley position of the adventitia, which will be described later, and below the line P. The one-dot chain line extending vertically indicates the valley position of the intima described below.

Both ends of the pair of main girders 4 are supported on a ring-shaped large frame member 6 which constitutes a lower structure. Each of the main girders 4 has an arch-shaped truss structure that is convex upward and extends parallel to the ridge. In FIG. 3, P indicates the position of the ridge. The plurality of roof beams 5 extend in a direction orthogonal to the main girder 4, which is the direction of roof flow, and the upper end is connected to the main girder 4 and the lower end is on the eaves side. It is connected to the frame member 6. Further, a roof beam 5 is installed between the pair of main girders 4 in a direction orthogonal to the main girders. The plurality of roof beams 5 installed as described above are arranged at predetermined intervals in a direction orthogonal to the direction of roof flow.

Each roof beam 5 has a three-dimensional truss structure, and in the present embodiment, both the upper chord member and the lower chord member are extended in one direction which is the flow direction of the roof, and the roof beam 5 has a longitudinal section V. It has a letter shape. A membrane panel is stretched between the upper chord members of the roof beam 5. The membrane panel 7 has a valley 7a having a V-shaped cross section, the central portion of which extends along the roof flow.
Is formed. As shown in FIG. 4, the trough shape of the membrane panel 7 is flat at the portions joined to the ridge A, the main girder 4, and the eaves B, but the ridge A and the main girder 4 are Between and between the main girder 4 and the ridge B, as the distance from the ridge A, the main girder 4 and the eaves B increases, the gradient in the direction orthogonal to the roof flow gradually becomes steeper, The slope is set to be maximum in the section.

The valley shape of the membrane panel is realized by pulling the central portion of the membrane panel between the upper chord members into the lower chord member 5b from the lower side. As shown in FIG. 5 in which the roof beam 5 is viewed from the extending direction, the central part of each membrane panel 7 is fixed to the upper chord member 5a as shown in FIG. At the same time, the other end is connected to the tension rod 13 extending upward from the lower chord member 5b. The length of the tension rod 13 can be adjusted by a screw mechanism.

In FIG. 5, 5c indicates a horizontal connecting member extending in a direction orthogonal to the roof flow, and 8 indicates an oblique member connecting the upper chord member 5a and the lower chord member 5b. Next, the shape of the membrane panel 7 and the configuration of the membrane panel 7 will be described in detail. Each of the above-mentioned membrane panels 7 has a strip shape extending in the flow direction of the roof, and as shown in FIG. 6, the membrane fixing plates 9 are fixed to the left and right end portions along the extending direction of the membrane panels 7, respectively. Has been done. The film fixing plate 9
A rope 10 is wrapped around the tip of the rope along the extending direction. Further, the film fixing plate 9 is provided with a plurality of bolt holes 9a for joining along the extending direction thereof. Further, a mounting plate 11 extending in the extending direction is fixed to the upper surface of the central portion of the membrane panel 7, and the mounting plate 11 also extends 1 in the extending direction.
The pair of ropes 12 are fixed. Further, the mounting plate 11 has a plurality of bolt holes 11a formed along its extending direction.

Further, among the lower chord members 5b of the roof beam 5, the lower chord members 5b extending in the flow direction of the roof are arranged along the extending direction thereof as shown in FIG. 7 which is a side view of the lower chord members 5b. Tension rod mounting portions 14 are provided at predetermined intervals. The lower end of the tension rod 13 is connected to the tension rod mounting portion 14. The tension rod 13 extends upward, and a membrane mounting member 15 is connected to the upper end of the tension rod 13. In FIG. 7, reference numeral 9 denotes a film fixing plate of the film panel 7 which is sandwiched by the film fittings 15.

Further, as shown in FIG. 8 which is an enlarged view of the upper part of the upper chord member 5a as seen from the extending direction, the upper part of the upper chord member 5a is attached with a film at predetermined intervals along the extending direction. The plate 16 is erected, and a membrane mount 17 extending parallel to the upper chord member 5a is fixed between the upper ends of the plurality of erected membrane mount plates 16. The membrane mount 17 has a plurality of bolt holes opened along the extending direction.

The attachment plate 11 provided at the center of the membrane panel 7 comes into contact with the membrane attachment base 17 fixed to the upper chord member 5a from above and is further fixed to the attachment plate 11. A pair of rope 12
Holding plate 18 extending in the extending direction of the upper chord member 5a
Touches from above. In addition, the pressing plate 1
8, a plurality of bolt holes 9a are opened along the extending direction. Further, the bolt holes 11a opened in the membrane mounting base 17, the mounting plate 11, and the pressing plate 18 are coaxial with each other, and are bolted through the bolts 19. Further, the flap film 20 is welded in situ so as to cover the upper side, and the flap film 20 is used for waterproofing.

In this manner, the central position of the membrane panel 7 is fixed to the upper chord member 5a via the membrane mount and the like, and the pair of ropes 12 restrains the movement of the membrane panel 7 in the left-right direction. There is. Further, as shown in FIG. 7, the two film fixing plates 9 provided on both ends of the film panel 7 fixed to the adjacent upper chord members 5a as described above are brought into contact with each other and bolted. ing.

The pair of bolted film fixing plates 9 are drawn toward the lower chord member 5b side as shown in FIG. 7 and FIG. 9 as seen from the extending direction of the membrane panel 7, and are attached to the lower chord member 5b. It is fixed to the membrane mounting member 15 connected through the tension rod 13. The membrane mounting bracket 1
The fixing by means of 5 is carried out by sandwiching the film fixing plate 9 from both sides and bolting it. In addition, 21
Indicates a steel plate.

Further, by adjusting the length of the tension rod 13, the film fixing plate 9 is pulled toward the lower chord member 5b side, and a predetermined initial tension is introduced into the film panel 7, whereby the valley 7a having a V-shaped cross section is formed. Are formed. Further, as shown in FIG. 10 in which the roof beam 5 is viewed from the extending direction, the membrane panel 7 portion having a gentle slope of the valley has a membrane mounting bracket 15 sandwiching a pair of the membrane fixing plates 9 at the valley position. A rod-shaped compression member 22 that extends vertically is interposed between and the tension rod 13. Further, one end of a pair of tension members 23 made of a cable is connected to the lower end of the compression member 22 via a turnbuckle 24. Each of the tension members 23 extends toward the upper chord member 5a, and the other ends thereof are connected to the upper chord member 5a. Then, by adjusting the length of the turnbuckle 24, a predetermined initial tension is applied to the tension material 23.

The joining of the upper chord member 5a and the membrane panel 7 in FIG. 10 shows another joining example different from the above. In the structure of this another example, a bolt member 26 is horizontally screwed to a mounting member 25 standing from the upper portion of the upper chord member 5a, and the lower surface of the membrane panel 7 is fixed to the tip of the shaft portion of the bolt member 26. Has been done. Then, by rotating the bolt member 26, the bolt member 26 is moved forward and backward so that the tension applied to the membrane panel 7 can be adjusted even on the upper chord member 5a side.

As described above, the outer membrane of the fixed roofs 1 and 1a having a V-shaped cross section is formed. Furthermore, the fixed roofs 1 and 1a of the membrane roofs are formed by laying an inner membrane on the inside of the roof beam 5. The inner membrane does not necessarily have a V-shaped cross section like the outer membrane. Also,
The pair of movable roofs 2 that cover the central portions of the fixed roofs 1 and 1a so as to be openable and closable is a frame as viewed from the extending direction of the ridge.
As shown in FIG. 12, which is a frame seen from the side of the building or the ridge, the roof surface has a double-flow structure with the ridge at the top, and the frame of the movable roof 2 is similar to the fixed roofs 1 and 1a. A roof beam 5, which is a space truss having a V-shaped cross section along the roof flow, is configured as a basic structure.

Membrane panels are stretched between the upper chord members of the roof beams in the same manner as the fixed roofs 1 and 1a, and the membrane panels between the upper chord members form valleys having a V-shaped cross section. . The slope of the valley of the membrane panel is set so that the side of the ridge and the main girder 4 is flat and gradually becomes steep toward the center. Similar to the fixed roofs 1 and 1a, the formation of the valleys is performed by sandwiching the lower membrane panel from below with a tension rod or the like and pulling it toward the lower chord member side.

The ridge position D of each of the movable roofs 2 is formed by pin joining and is rotatable about the extension direction of the ridge. The left and right ends are supported by the main girder 4 via a bogie, and the bogie travels on rails provided on the main girder 4, whereby each movable roof 2
Are movable in the extending direction of the main girder 4, that is, the ridge.

However, the movable roof 2 has a single membrane panel, and the fixed roofs 1 and 1a have a double inner and outer membrane panel having a light transmittance higher than that of the movable roof 2.
When the roof is closed, the brightness at the movable roof 2 position and the fixed roof 1,
The brightness at the position 1a is made substantially uniform so that the interior of the room has a uniform brightness. Here, the membrane panel 7 is made of, for example, a tetrafluoroethylene resin coated glass fiber cloth. And fixed roof 1,1
The light transmittance of the film panel 7 constituting the outer film of a is 1
As the membrane panel 7 which uses 5.3%, the membrane panel 7 which has an optical transmittance of 30.4% is further used as the membrane panel 7 which constitutes the outer membrane of the movable roof 2. A material having a transmittance of 12.3% is used.

As a result, the brightness contrast between the positions of the fixed roofs 1 and 1a and the position of the movable roof 2 becomes small, and the brightness under the roof is set to be uniform. In the membrane roof structure having the above configuration, the ring-shaped large frame member 6 provided around the roof bears the horizontal thrust acting on the main girder 4 to increase the rigidity of the entire roof surface. Further, the roof girder 5 made of a three-dimensional truss suppresses the deformation of the main girder 4 and enables stable movement of the movable roof 2. For this reason,
The roof of this embodiment can form a large-scale membrane roof.

Further, when the membrane roof is used in a heavy snow area, the roof structure has a double-flow structure, so that the snow accumulated on the roof easily slides down along each flow of the roof with the ridge as a boundary. There is. At this time, since the snow crack 3 is provided in the ridge which is the top of the roof, the snow crack 3
The snow accumulation on the roof is reliably divided at the ridge, and the tensile resistance acting on the snow at the ridge position becomes small. As a result, it is easier to slide down along the flow of both roofs.

Further, the membrane panel 7 constituting the roof surface is
The peaks and valleys are continuous in the direction orthogonal to the roof flow. Therefore, the snowfall on the membrane panel 7 is divided into the left and right valley sides at the above-mentioned mountain position, and the snowfall is more likely to slide off. Further, since the valley formed on the roof surface extends in the flow direction of the roof, snow falls along the valley, but on the upper side of the valley, there is a protruding portion that inhibits the conventional slip. Since there is no snow, the snow on the roof slides along the valley more smoothly than before.

At this time, since the valley is flat at the joint with the main girder 4 and the eaves, it is possible to avoid the accumulation of snow at the joint. In addition, in the portion of the membrane panel 7 between the upper chord members 5a where the gradient in the direction orthogonal to the flow of the roof is gentle, the membrane surface is close to horizontal, so between the position of the membrane fitting 15 and the upper chord member 5a position. The film surface of No. 2 may be bent downward due to the snow load, as shown by the dotted line in FIG.

When bent as described above, a downward compressive force is applied to the compressing member 22, but the pair of tension members 23 resist the compressive force, whereby the valley position may be displaced downward. Prevented and the roof is held at the intended slope. Further, the snow accumulated on the movable roof 2 also slides down in the same manner as above, but since the flow direction of the movable roof 2 and the flow direction of the fixed roof 1 are in the same direction, the movable roof 2 is fixed to the fixed roof. The snow that has moved to 1 slides down along the roof surface of the fixed roof 1 as it is.

Further, since the movable roof 2 has a structure in which the left and right lower end portions sandwiching the ridge position are movable along the extending direction of the ridge, the left and right lower end portions are regarded as a pin structure. In addition, since the ridge position that is the top of the movable roof 2 has a pin structure, the movable roof 2 has a three-hinge frame structure. As a result, the movable roof 2 is also deformed following the deformation of the lower structure, and it is possible to avoid applying an unreasonable load to the carriage supporting the movable roof 2, the fixed roofs 1 and 1a side, and the like. There is.

Further, in this embodiment, the roof surface is covered with the membrane panel 7.
As a result, the interior space is bright and airy even without lighting during the day. At this time, the position of the movable roof 2 adopts a single membrane structure for weight reduction, but the fixed roofs 1 and 1a are added by improving the appearance of the internal space by providing an inner membrane inside. It has value. At this time, as described above, the light transmittance of the membrane panel 7 to be used is made different, and the brightness of the movable roof 2 position and the fixed roofs 1 and 1a positions are made uniform to eliminate a feeling of strangeness.

Further, in this embodiment, since the troughs are formed by pulling in the membrane panels 7 from the inside, even if the membrane panels 7 loosen due to aging, the tension is not re-introduced into each membrane panel 7. By changing the length of the tension rod 13 from the inside, it can be carried out easily and safely. As described above, the membrane roof structure of the present embodiment has a structure in which the snow accumulated on the roof surface is easily slid off, and a large-scale membrane roof structure can be constructed in a snowy area.

In the above embodiment, the membrane roof structure provided with the movable roof 2 whose roof can be opened and closed is shown in FIG.
A membrane roof structure without the movable roof 2 as shown in FIG. In this case, the main girder 4 is extended along the ridge position, the roof beam 5 is installed between the main girder 4 and the large frame member 6, and between the roof beams 5,
The membrane panel 7 is stretched as described above. Note that, in FIG. 13, the position indicated by the alternate long and short dash line is the portion that is the valley of the membrane panel.

[0048]

As described above, in the membrane roof structure of the present invention, the main girder is supported by the roof beams of the truss structure, so that a large-scale membrane roof can be constructed and the roof structure can be used for both flows. Because of the construction, the snow on the roof will easily slide down along each flow of the roof with the ridge as the boundary. Furthermore, the roof surface at the upper chord member position of the roof beam constitutes a mountain along the roof flow, and the formation of the mountain further divides the snow cover. As a result, the tensile resistance acting on the snow becomes weaker in the direction orthogonal to the roof flow, and
Snow is more likely to slide along the roof.

As described above, since the roof has a membrane roof structure in which snow is easily slipped off, it is possible to construct a large-scale membrane roof in a snowy area. At this time, if the invention as set forth in claim 2 is adopted, the slope of the membrane panel from the mountain to the valley at the joint with the main girder or eaves becomes gentle, so on the ridge side in the valley along the roof flow. There is no snow puddle provided at a certain top position and the eaves side bottom position. Moreover, by making a steep slope in the middle portion, there is an effect that the snow is surely divided with the mountain as a boundary, and the snow is more likely to slide down.

Further, when the invention described in claim 3 is adopted, since the trough position of the membrane panel is sandwiched from the lower side and pulled downward, snow sliding is hindered above the conventional trough on the roof surface. It is possible to prevent the formation of the protruding portion that is formed, and it is possible to further prevent the snowfall from slipping off. At this time, since the roof beam has a truss structure, only by providing the roof beam, an upper chord member serving as a skeleton on the mountain position side and a lower chord member serving as a skeleton on the valley position side are provided, and the trough position of the membrane panel is provided. It is not necessary to separately provide a cable or the like for pulling the cable downward.

Further, when the invention according to claim 4 is adopted, even if the slope of the valley is made gentle, the snow load applied to the membrane panel is supported by the tension member connecting the lower part of the compression member and the upper chord member. Therefore, there is an effect that the valley position of the membrane panel is prevented from dropping more than a predetermined amount. Further, if the invention described in claim 5 is adopted, the snow is surely divided at the ridge by the snow cracks provided in the ridge, the tensile resistance does not work on the snow at the ridge position, and the snow falls further. This has the effect of making it easier.

When the invention according to claim 6 is adopted, even in a membrane roof structure having a movable roof, the flow directions of the fixed roof and the movable roof are the same, so the movable roof slides down. Then, the snowfall that has fallen on the fixed roof then slides along the flow of the fixed roof. As a result, it is possible to provide a membrane roof structure having a movable roof in a snowy area.

When the invention according to claim 7 is adopted, the movable roof has a single membrane panel, and the fixed roof has a membrane panel having a higher light transmittance than the membrane panel of the movable roof.
By making it heavy, the brightness at the movable roof position and the brightness at the fixed roof position can be made substantially uniform when the roof is closed, and the interior can be created as a space of uniform brightness, and it is possible to prevent the occurrence of discomfort. There is.

When the invention described in claim 8 is adopted, the movable roof is also deformed following the deformation of the lower structure,
There is an effect that it becomes possible to avoid applying an unreasonable load to the trolley supporting the movable roof, the fixed roof side, or the like.

[Brief description of drawings]

FIG. 1 is a side view of an outer appearance of a membrane roof structure according to an embodiment of the present invention as viewed from the extending direction of a ridge.

FIG. 2 is a side view of the outer appearance of the membrane roof structure according to the embodiment of the present invention as seen from the side direction of the ridge.

FIG. 3 is a plan view of a fixed roof portion of the membrane roof structure of the embodiment according to the present invention, in which a movable roof is omitted, as viewed from above.

FIG. 4 is a schematic diagram showing a valley shape of a membrane panel used in a membrane roof structure of an example according to the present invention.

FIG. 5 is a side view of a portion having a steep slope of a valley in the membrane roof structure according to the embodiment of the present invention.

FIG. 6 is a diagram showing a membrane panel of an example according to the present invention.

FIG. 7 is a view showing the connection between the membrane panel and the lower chord member according to the embodiment of the present invention.

FIG. 8 is a side view of the connection between the membrane panel and the upper chord member according to the embodiment of the present invention as seen from the direction of the roof flow.

FIG. 9 is a side view of the connection between the membrane panel and the lower chord member according to the embodiment of the present invention as viewed from the direction of the roof flow.

FIG. 10 is a side view of a portion of the membrane roof structure according to the embodiment of the present invention in which the valley has a gentle slope.

FIG. 11 is a side view of the frame of the membrane roof structure according to the embodiment of the present invention as viewed from the extending direction of the ridge.

FIG. 12 is a side view of the frame of the membrane roof structure according to the embodiment of the present invention seen from the side of the ridge.

FIG. 13 is a top view showing another example of the membrane roof structure according to the embodiment of the present invention.

FIG. 14 is a perspective view showing a membrane roof structure of an embodiment according to the present invention.

FIG. 15 is a side view showing a valley portion of a roof surface of a conventional membrane roof structure.

[Explanation of symbols]

 Extension direction of P building 1, 1a Fixed roof 2 Movable roof 3 Snow split 4 Main girder 5 Roof girder 5a Upper chord member 5b Lower chord member 7 Membrane panel 7a Valley 13 Tension rod 15 Membrane mounting bracket 22 Compression member 23 Tension material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kaoru Nishikawa 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Osamu Hosawa 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Nobuyuki Ariyama 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Isamu Nakagawa 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation Ltd. (72) Inventor Takahira Shimamura 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation Ltd. (72) Inventor Taro Mizutani 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Within the corporation

Claims (8)

[Claims] 1. A membrane roof structure having a main girder extending along a ridge or parallel to the ridge and having a roof surface formed by a membrane panel, wherein the roof structure is a double-flow structure with the ridge at the top, In addition, a plurality of roof beams of a truss structure installed along the roof flow direction between the main girder and the eaves are arranged in the direction orthogonal to the roof flow, and the adjacent roof beams are A membrane roof structure, wherein a membrane panel is stretched between the upper chord members, and further, a central portion of the membrane panel between the upper chord members is a valley that is recessed along the direction of the roof flow. 2. The gradient of the membrane panel between the upper chord members in the direction orthogonal to the roof flow is gentle on the main girder side and the eaves side, and steep on the intermediate portion between the main girder side and the eaves side. Claim 1 characterized in that
Membrane roof structure described in. 3. The tension rod which sandwiches the valley position of the membrane panel from below and which is capable of pulling the sandwiched portion toward the lower chord member of the roof beam. Membrane roof structure described in. 4. A compression member that holds the valley position of the membrane panel from below and extends downward, a tension member that connects the lower portion of the compression member and the upper chord member of the roof beam, and the compression member. The tension | tensile_strength rod which can be pulled toward the lower chord member of the above is provided, The membrane roof structure in any one of Claim 1 to 3 characterized by the above-mentioned. 5. The membrane roof structure according to claim 1, wherein a snow crack is provided on the ridge along the ridge. 6. A membrane roof structure comprising a fixed roof having a partial opening, and a movable roof capable of opening and closing the opening of the fixed roof and movable in the extension direction of the ridge, wherein the fixed roof and the movable roof are provided. Is a double-flow structure with the ridge at the top, and the membrane roof structure according to any one of claims 1 to 5. 7. The movable roof is composed of a single membrane panel, the fixed roof is composed of a double membrane panel of an outer membrane and an inner membrane, and the fixed roof is more fixed than the membrane panel constituting the movable roof. The membrane roof structure according to claim 6, wherein the membrane panel constituting the roof has a high light transmittance. 8. The membrane roof according to claim 6 or 7, wherein the ridge position of the movable roof has a pin structure that allows only rotation about the extension direction of the ridge. Construction.