JP2939926B2 - Air film zenith structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air film structure such as an air film used for constructing a concrete dome roof above a structure such as a storage tank, and an air film structure used for an air dome or the like. The present invention relates to a zenith structure of an air film formed in a blasted shell shape using a woven cloth material.

[0002]

A concrete dome is formed by casting concrete mortar, concrete, or the like on an air film covering the upper part of a structure such as a storage tank in the shape of a split spherical shell dome such as a hemisphere under internal air pressure. An airtight and flexible film material such as an air film used for a method of constructing a roof or an air film used for an air dome is a cloth material in which a resin material such as a vinyl chloride resin is coated on a fiber fabric such as a polyester fiber. ing.

In general, a fabric material of a fiber woven fabric coated with a resin material has a dimensional restriction on a width of the fabric material in a weft direction due to a manufacturing method of a fiber woven fabric made by weaving a warp yarn and a weft yarn. When it is received, the warp direction and the weft direction are stronger in the warp direction and stretch better in the weft direction.

[0004] Air film pieces are collected from the cloth material, the ends of the air film pieces are overlapped and sewn with a sewing machine or the like, hot-air welding, fusion bonding of a thermoplastic coating material, high-frequency welding, Welding joining such as hot plate welding,
Alternatively, bonding is performed by a bonding method such as adhesive bonding using an adhesive to form an air film having a desired shape.

More specifically, in the case of an air film used in the method of constructing a concrete dome roof shown in FIGS. 3 and 4, an outer peripheral end is air-tightly fixed to an upper portion of a structure 32 such as a bottomed cylindrical storage tank, and a blower is provided. Concrete or concrete mortar (not shown) is cast on the air film 31 covering the upper part of the structure 32 in the shape of a broken shell by receiving the internal air pressure of the air supplied from the blower 33. As shown in FIG. 5, the air film 31 used in the method of constructing the roof is formed in a circular shape by providing a diameter over the entire width of the cloth material 2 in which a fiber material such as polyester fiber is coated with a resin material such as vinyl chloride resin. The cloth material 2 is cut out to form a zenith film piece 30 of the air film 31 located at the zenith part, and the annular part surrounding the zenith part is divided into a plurality of pieces along the radial direction of the spherical shell to obtain a fan shape.
The radial direction of the spherical shell is aligned with the direction of the warp yarn 2A to form a fan-shaped membrane piece 4, and the side end portions of the fan-shaped membrane piece 4 are overlapped and welded together to form an annular membrane piece 5 and its annular shape. The inner peripheral edge of the membrane piece 5 and the outer peripheral edge of the zenith membrane piece 30 were overlapped and welded together to form a split-shell-shaped air film 31.

[0006] The zenith of the split membrane shell-shaped air film formed by welding and joining the zenith film piece to the annular film piece obtained by welding and joining the sector-shaped film piece is formed by the annular film piece and the zenith film piece. A large number of welded joints of the fan-shaped film pieces gather at the welded joint at short circumferential intervals, and the expansion of the air film is restrained by the welded joints of the many air film pieces, and the two joined parts of the fan-shaped film pieces are joined together. Stress concentration due to a sudden change in the cross-sectional shape is likely to occur between a welded joint in which three zenith film pieces are superposed on one another and a single air film, and the strength of the air film tends to decrease. In addition, since the zenith film piece is formed of a cloth material having a difference in strength and elongation in the weft direction and the warp direction, the zenith of the air film is easily deformed into an irregular shape when applying tension by applying internal air pressure. In addition, there was a possibility that breakage such as film cracks might occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and the like. In this invention, a blasted shell-shaped air film used for construction of a concrete dome roof, an air dome, or the like is formed of a resin-coated fiber woven cloth material. It is an object of the present invention to provide a zenith structure of an air film having an excellent shape, in which damage such as air leakage and cracks does not occur at the zenith of the formed air film.

[0008]

The zenith structure of the air film of the present invention is an annular film formed in a truncated spherical shell shape out of a split spherical shell-shaped air film formed of a resin-coated fiber woven cloth material. A circular zenith membrane piece disposed inside the piece covers a circular zenith membrane with an outer peripheral end overlapped on the inner peripheral end of the annular membrane piece and stitched and joined, and the zenithal membrane is covered with the zenithal membrane piece. The warp direction of the cloth material intersects with the warp direction of the cloth material of the lower zenith membrane, and the outer circumferential end is overlapped and welded to the annular film piece to form a circular zenith top film. In other words, two cloth materials that cross in the warp direction of each cloth material of the lower zenith membrane and the zenith film are overlapped so that the directional difference in elongation and strength between the warp direction and the weft direction of the cloth material is harmonized. Form. In addition, the junction between the lower zenith membrane and the annular membrane piece of the zenith membrane is shifted so that the suture joint is on the inside and the weld joint is shifted to the outside so as not to overlap, and the convergence of the joint and the sudden change in cross-sectional shape that restrict the elongation Is formed so as to disperse the stress concentration caused by the stress. Further, the force applied to the joint between the zenithal membrane piece and the annular membrane piece of the split spherical shell-shaped air membrane in an attempt to expand by receiving the internal air pressure is reliably received by the suture joint of the lower zenith membrane to the annular membrane piece, and a slight The zenithal lower membrane and the zenithal membrane share and maintain the expansion force applied to the zenithal part by relaxing the suture by elongating the suture, and air leakage of the internal air pressure is caused by the welded joint of the zenithal membrane to the annular membrane piece. It is formed so as to cut off.

The zenith structure of the air film provided with an annular zone is provided by covering the outer peripheral edge of the zenith top membrane joined to the annular membrane piece with a band-like annular zone, and covering with the annular zone. Is formed by welding and joining the zenithal top membrane and the annular membrane piece at the annular zone, and the outer peripheral end of the zenith top membrane welded to the annular membrane piece by the expansion force of the internal air pressure is deformed and tends to peel off The force is formed so that the zone is reliably suppressed, and the air of the internal air pressure, which tends to leak due to peeling, is reliably shut off by the welded joint of the zone.

In the zenith structure of the air film provided with an annulus, the suture joint between the annular membrane piece and the sub-zenithal membrane is covered with a thin film-like annulus from below, and the annulus is formed by the annulus. The lower part of the zenith and the annular membrane piece of the coated part are bonded and bonded with the annular zone,
The air of the internal air pressure applied from below is leaking from the suture joint between the annular membrane piece and the zenithal membrane by the adhesive bonding force of the hermetic annulus and the adhesive for the annulus adhesive that has also entered the seam. It is formed so as to reliably shut off from below.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional explanatory view showing one embodiment of a zenith structure of an air film according to the present invention, and FIG. 2 is an example of a method of collecting a film piece of an air film from a cloth material of a resin-coated fiber fabric. FIG.

In the drawing, reference numeral 1 denotes an air film in the shape of a broken shell, and reference numeral 2 denotes a cloth material for collecting a film piece of the air film 1, which is formed by coating a textile fabric such as polyester fiber with a thermoplastic resin material such as vinyl chloride resin. 2A is the warp of the fiber woven fabric of the cloth material 2 and 2B is the weft of the fiber woven fabric of the cloth material 2. 3
Is a zenith membrane piece composed of a circular zenith membrane 6 collected from the cloth material 2 and a circular zenith membrane 7 larger than the zenith membrane 6, 4 is a sector membrane piece, and 5 is a sector membrane piece 4. It is an annular film piece that is joined.

The split-shell-shaped air film 1 is formed by joining a circular zenith-film piece 3 located at the zenith and a truncated spherical-shell-shaped annular piece 5 surrounding the zenith. The annular membrane piece 5 divides the annular portion surrounding the zenith into one or more concentrically (FIG. 4
In the case of (1), the circular portion is divided into a plurality of pieces along the radial direction of the spherical shell, and the radial direction of the spherical shell is cut along the direction of the warp 2A of the cloth material 2 and cut out. A piece 4 is formed, and the side end portions of the fan-shaped membrane piece 4 are overlapped and air-tightly joined by welding, air-tight stitching, or the like.

The circular zenith membrane piece 3 disposed on the inner zenith of the annular membrane piece 5 is overlapped with the outer peripheral end of the circular membrane piece on the inner peripheral end of the annular membrane piece 5 and stitched and joined. The zenithal membrane 6,
An outer peripheral end portion of the circular film piece is overlapped on the annular film piece 5 so as to cover the lower zenith film 6 and is formed by a zenith top film 7 welded and joined;
The zenith membrane 7 disposed on the zenith membrane 6 has a predetermined angle between the direction of the fabric warp 2A of the zenith membrane 6 and the direction of the fabric warp 2A of the zenith membrane 7, for example, 90 degrees as shown in the figure. It overlaps so that it may cross at right angles or 45 degrees (not shown).

As shown in FIG. 2, a circular film piece used for the lower zenith film 6 and the zenith film 7 is provided with a diameter so as to fill the entire width of the cloth material 2 and cut into a circular shape to form the zenith film 7. The zenith sub-membrane 6 is formed by cutting the zenith membrane 7 from the cloth material 2 into a circular shape having a slightly smaller diameter by subtracting a necessary bonding margin from the annular membrane piece 5.

As described above, the zenith film piece 3 composed of the two cloth materials 2 of the lower zenith film 6 and the upper zenith film 7, which cross the direction of the warp 2 A at a predetermined angle and overlap each other, Since the directional difference between the elongation and the strength of the direction is harmonized, even if the tension of the hoop force is applied in all directions of the spherical shell to expand the split spherical shell of the air film 1 due to the internal air pressure, it is possible to support in good balance. it can.

Further, the lower zenith membrane 6 and the upper zenith membrane 7 share and hold the expanding force applied to the zenith part when the air film 1 tries to expand due to the internal air pressure. The force of the internal air pressure applied to the joint of the zenithal membrane piece 3 is determined by the suture joint 8 in which the lower zenith membrane 6 and the annular membrane piece 5 are sewn with the suture 8S.
, And while the suture 8S is slightly stretched, the support is relaxed in a well-balanced manner, and the air leak of the internal air pressure from the joint due to the stitching of the zenith membrane piece 3 is prevented from flowing to the annular membrane piece 5 of the zenith top membrane 7. The airtight welding joint 9 completely shuts off.

The joints 8 and 9 of the zenith membrane 7 and the zenith membrane 6 to the annular membrane piece 5 are fan-shaped membrane pieces 4 and 4 that restrain elongation.
The joints of the two converge at a short circumferential interval, and stress concentration is likely to occur between the welded joint of the three stacked film bodies and the other air film 1 due to a sudden change in the cross-sectional shape. Welding joint 9 between membrane 7 and annular membrane piece 5, sub-zenith membrane 6 and annular membrane piece 5
The stitched joints 8 are shifted such that the welded joints 9 are located outside and the sutured joints 8 are located inside so as not to overlap with each other, and provided with a required predetermined separation distance or joining margin to converge the joints. And to reduce the concentration of stress.

In the illustrated embodiment, the zenith of the zenith membrane piece 3 is sealed so that air leaks are double sealed and the zenith lower membrane 6 and the zenith top membrane 7 move independently to easily share and support the internal air pressure. Although the lower film 6 and the zenith film 7 are formed without being joined together, they are formed one by one. The directional difference between the elongation in the vertical and horizontal directions and the strength of the material 2 is as follows.
It harmonizes more integrally and becomes stronger against omnidirectional tension, and the strength of the joints 8 and 9 between the zenithal membrane piece 3 and the annular membrane piece 5 is
The zenith film piece 3 can be formed more strongly against peeling of the pneumatic expansion deformation.

The outer peripheral edge of the zenith top membrane 7 welded to the annular membrane piece 5 and the annular membrane piece 5 in the vicinity thereof are coated with a fiber woven fabric such as polyester fiber and a thermoplastic resin material such as vinyl chloride resin. Band-like ring band 10 formed by
Then, the zenithal top film 7 and the annular film piece 5 at the portion covered with the annular zone 10 are welded and joined with the annular zone 10.

When the outer peripheral end of the zenith top membrane 7 is covered with the ring zone 10 thus welded and joined, the outer peripheral end of the zenith top membrane 7 welded and joined to the annular membrane piece 5 is pulled by the expansion force of the internal air pressure. The annular zone 10 reliably suppresses the force of deforming and peeling from above, and the air-tightly welded joint 11 of the annular zone 10 reliably blocks air of internal air pressure that tends to leak due to peeling.

The suture joint 8 between the annular membrane piece 5 and the sub-zenithal membrane 6 is covered from below with a thin annular membrane-shaped annular zone 12 made of an airtight synthetic resin film material such as a vinyl sheet. The upper and lower ends of the band 12 are overlaid on the lower zenith membrane 6 and the annular film piece 5 from below, respectively, and an adhesive is applied to the suturing joint 8 including the inside of the seam covered with the annular band 12 and bonded.

When the annular joint 12 bonded to the annular membrane piece 5 and the zenithal submembrane 6 is covered from below with the adhesive band 12 thus bonded, the suturing joint 8 between the annular membrane piece 5 and the zenithal underlying membrane 6 starts. The air-tight adhesive joint 13 of the annulus 12 reliably blocks air of internal air pressure that is about to leak.

As described above, the zenith membrane piece 3 is formed by the zenith membrane 6 and the zenith membrane 7, and the zenith part of the air membrane 1 formed by providing the orbicular zone 10 and the annulus 12 has a large internal air pressure. Even if it is added, it does not cause damage such as air leaks and film cracks, and has an excellent shape, so when applied to the air film 1 used for the method of constructing a concrete dome roof, it is possible to construct a roof with excellent appearance and strength, Furthermore, it goes without saying that the dome structure is more suitable for the air dome.

[0025]

According to the present invention, since the zenith membrane piece is formed of the zenith sub-membrane and the zenith top membrane as described above, the zenith membrane piece has the elongation and strength in the warp direction and the weft direction of the cloth material. The differences are reconciled, the concentration of joints constraining elongation and the stress concentration due to sudden changes in the cross-sectional shape of the joints are alleviated, and the force applied by the internal air pressure is reliably received and mitigated by the suture joints, and furthermore the zenith Is applied and held by the lower zenith membrane and the upper zenith membrane, and air leakage at the suture joint is blocked by the welded joint of the zenith membrane, so that air formed of resin-coated fiber woven cloth material The zenith of the film does not suffer from damages such as air leaks and cracks, and the zenith structure of the air film has an excellent shape with little deformation.

Further, as described above, in the invention of the zenith structure of the air film provided with the annular zone, the outer peripheral end of the zenith film welded to the annular film piece is deformed by the expanding force of the internal air pressure and tends to peel off. The ridge of the air film, which has better strength and airtightness, because the weld zone of the annular zone reliably blocks the air of internal air pressure that tends to leak due to peeling, It can be structured.

Further, as described above, according to the invention of the zenith structure of the air film provided with the annulus, the air of the internal air pressure applied from below may leak from the suture joint between the annular film piece and the zenithal membrane. Since the hermetic annulus and the adhesive bonding portion of the annulus reliably block from below, the zenith structure of the air film can be further enhanced in hermeticity.

[0028]

[Brief description of the drawings]

FIG. 1 is an explanatory partial cross-sectional view showing one embodiment of a zenith structure of an air film according to the present invention in a partially cutaway enlarged and simplified form.

FIG. 2 is an explanatory plan view showing an example of a method of collecting a film piece of an air film by partially cutting out and simplifying the method.

FIG. 3 is an explanatory cross-sectional view showing a simplified example of an arrangement of an air film used in a method of constructing a concrete dome roof.

FIG. 4 is an explanatory plan view schematically showing the air film of FIG. 3;

FIG. 5 is an explanatory plan view showing an example of a conventional air film piece sampling method with a partial cutout and simplified.

[Explanation of symbols]

Reference Signs List 1 air film 2 cloth material 2A warp yarn 2B weft yarn 3 zenith membrane piece 4 fan-shaped membrane piece 5 annular membrane piece 6 zenithal lower membrane 7 zenith top membrane 8 suture joint 8S suture 9 weld joint 10 ring zone 11 weld joint 12 ring Belt 13 adhesive joint 30 zenith film piece 31 air film 32 structure 33 blower

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Wada 4-2-111 Ginza, Chuo-ku, Tokyo Inside Ishii Iron Works Co., Ltd. (72) Inventor Yoshiaki Shioya 3-3-1-3 Rokujo-Omizo, Gifu City, Gifu Prefecture No. Inside Abe Industrial Co., Ltd. (72) Inventor Hidetomo Hirosawa 10-13, Fuyuki, Koto-ku, Tokyo Ogawa Tent Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) E04H 15/00-15/64

Claims (3)

(57) [Claims] 1. A zenith membrane piece formed into a zenith circular shape,
In the zenith structure of the air membrane formed of a fiber woven cloth material resin-coated in a shape of a broken truncated shell by joining annular membrane pieces formed in a truncated spherical shell shape surrounding the zenith part, Is a lower zenith membrane formed by overlapping and sewn the outer peripheral end of the circular membrane piece on the inner peripheral end of the annular membrane piece, and the warp direction of the fabric fiber woven fabric covering the lower zenith membrane And a zenith top membrane formed by intersecting the warp direction of the cloth material fiber woven fabric of the lower zenith membrane and overlapping and welding and joining the outer peripheral end of the circular membrane piece on the annular membrane piece. Characteristic zenith structure of air film. 2. A belt-like orbicular zone covering the outer peripheral edge portion of the zenithal top membrane joined to the above-mentioned annular membrane piece, wherein the orbicular zone and the zenithal top membrane at the location covered by the orbicular zone are provided. 2. The zenith structure of an air film according to claim 1, wherein the air film is formed by welding and joining to a film piece. 3. A thin-film membrane-shaped annulus that covers a suture joint between the annular membrane piece and the sub-zenithal membrane from below, wherein the annulus comprises:
3. The method according to claim 1, wherein the lower zenithal membrane and the annular membrane piece at a location covered with the annular zone are bonded and bonded.
The zenith structure of the described air film.