JP6548705B2 - Octagonal hollow tube for greenhouse - Google Patents
Octagonal hollow tube for greenhouse Download PDFInfo
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- JP6548705B2 JP6548705B2 JP2017200054A JP2017200054A JP6548705B2 JP 6548705 B2 JP6548705 B2 JP 6548705B2 JP 2017200054 A JP2017200054 A JP 2017200054A JP 2017200054 A JP2017200054 A JP 2017200054A JP 6548705 B2 JP6548705 B2 JP 6548705B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Description
本発明は、特殊な断面形状を有する温室用中空管に関するものである。 The present invention relates to a hollow tube for a greenhouse having a special cross-sectional shape.
従来、組み立てて温室にするためのパイプ材料としては、断面円形の中空管が多用されている。
この断面円形の中空管を従来周知の十字接手を用いて縦横十字形に接合すると、縦方向の中空管と横方向の中空管とが、その円形表面同士が交叉して直接接触する接合形態とならざるを得ず、その接触面積が極めて小さい点接触となる。
このため、十字接手の鋼材厚が同一の場合、その緊締強度は縦横の部材の点接触の摩擦力に依拠することとなり、接手の緊締強度を向上しようとしても自ずと限界がある。
Conventionally, a hollow tube with a circular cross section is often used as a pipe material for assembling into a greenhouse.
When a hollow tube having a circular cross section is joined to form a cruciform using a conventionally known cruciform joint, the hollow tubes in the longitudinal direction and the hollow tubes in the transverse direction are in direct contact with each other with their circular surfaces crossing each other. It has to be in the form of junction, and the contact area is extremely small.
For this reason, when the steel material thickness of the cross joint is the same, the tightening strength depends on the frictional force of the point contact of the vertical and horizontal members, and there is a limit to improve the tightening strength of the joint.
本発明は、従来の中空管製造設備を利用して安価、簡単に製造可能で、十字等の各種接手の緊締強度が高い温室用中空管を提供することを目的とするものである。 An object of the present invention is to provide a hollow tube for a greenhouse, which can be manufactured inexpensively and easily using conventional hollow tube manufacturing equipment, and has high tightening strength of various joints such as crosses.
また、温室用中空管は通常、２本の中空管を棟部で接合したアーチ部材を棟方向に間隔を置いて必要本数、その両下端部を地面に挿入してあるいはコンクリート製基礎に埋めることによって建て込んで、次いでこれら複数のアーチ部材に水平方向の直線部材を各種接手にて連結して、温室が構築されている。 Also, for hollow tubes for greenhouses, generally, arch members in which two hollow tubes are joined by ridges are spaced apart in the ridge direction and the necessary number is inserted, and both lower end portions are inserted into the ground or concrete foundation A greenhouse is constructed by constructing by filling and then connecting horizontal straight members to the plurality of arch members by connecting various joints.
ところで、このアーチ部材は、断面円形の中空直管を両端部を除く中央部分で曲げ加工した２本の中空湾曲管を連結パイプにて連結して製造されている。
そこで、本発明は、中空管の断面形状を多角形としても、曲げ加工を施す湾曲部にて損傷することのない、曲げ加工容易な温室用中空管を提供することをも併せて目的としている。
By the way, this arch member is manufactured by connecting two hollow curved pipes obtained by bending a hollow straight pipe having a circular cross section at the central portion excluding both ends by a connecting pipe.
Therefore, the present invention has an object to provide a hollow tube for a greenhouse which is easy to be bent without damaging the curved portion to be bent even if the hollow tube has a polygonal sectional shape. And
請求項１にかかる発明は、中空直管と湾曲部を備えた中空湾曲管を骨組み材に用いた植物栽培施設用の骨組み材であって、骨組み材が、中空直管と湾曲部を備えた中空湾曲管を含んでおり、該骨組み材同士は接触交差して接合されるものであって、中空直管と中空湾曲管の断面が八角形である八角形中空管材であることを特徴とする植物栽培用施設の骨組み材であって、更に、門形であって、上部側に八角中空管の断面の内５面に接する曲折面を有する巻回部と、下部側面側に八角中空管の断面の内５面に対応する受け部を有する十字接手とを備えていることを特徴とする植物栽培用施設の骨組み材である。
請求項２に係る発明は、中空直管は、長さ方向全体に亘って直線状の断面八角形の中空直管であり、中空湾曲管は、一方端が直線状の温室の軒部で、他端が略直線状の温室の屋根部で、中間部が円弧状に湾曲した湾曲部である断面八角形の中空湾曲管であり、温室において中空直管と中空湾曲管が交差する接合部を有しており、交差する接合部において、中空直管と中空湾曲管が、門形であって、上部側に八角中空管の断面の内５面に接する曲折面を有する巻回部と、下部側面側に八角中空管の断面の内５面に対応する受け部を有する十字接手によって両者が交差接合されるものであって、交差部において中空直管と中空湾曲管は八角形の平面同士が接触交差となることを特徴とする請求項１記載の植物栽培用施設の骨組み材である。
The invention according to claim 1 is a framework for plant cultivation facilities using a hollow curved tube having a hollow straight tube and a curved portion as a framework, wherein the framework has a hollow straight tube and a curved portion. A hollow curved tube is included, and the frame members are joined in contact crossing and are characterized in that the hollow straight tube and the hollow curved tube are octagonal hollow tubes whose cross sections are octagonal. What framework material der facility for plant cultivation, further, a gate shape, and the wound portion having a bent surface on the upper side in contact with the fifth surface of the cross section of octagonal hollow tube, octagonal in the lower side surface it is the framework material of the facility for plant cultivation, characterized in that a cross catch having a receiving portion corresponding to the five surfaces of the cross section of the empty tubes.
In the invention according to claim 2 , the hollow straight pipe is a hollow straight pipe having an octagonal cross section that is straight in the entire length direction, and the hollow curved pipe is an eaves portion of a greenhouse having one end straight. the other end at the roof of the substantially linear greenhouse, a hollow bent tube of octagonal cross-section is a curved portion intermediate part is curved in an arc shape, a joint hollow straight tube and the hollow curved pipe in the greenhouse intersect In the joint where the hollow straight tube and the hollow curved tube are gated at the junction where they intersect, a winding portion having a bent surface on the upper side that contacts the inner five surfaces of the cross section of the octagonal hollow tube; The two are cross-joined together by a cross joint having receiving parts corresponding to five of the cross-sections of the octagonal hollow tube on the lower side, and the hollow straight tube and the hollow curved tube have octagonal planes at the intersection. It is a framework of the plant cultivation facility according to claim 1, characterized in that they are in contact with each other.
請求項１に係る発明によれば、断面円形の中空管であった従来の温室用中空管を、断面八角形とする簡単な構成で、従来の中空管製造設備を利用して安価、簡単に製造可能で、十字等の各種接手の緊締強度が高く、曲げ加工が施された湾曲部における損傷の少ない温室用中空管を提供することができる。
請求項２に係る発明によれば、各種接手の緊締強度をさらに高くすることができる。
According to the invention of claim 1, the conventional hollow tube for a greenhouse, which is a hollow tube having a circular cross section, has a simple configuration in which it has an octagonal cross section and is inexpensive using conventional hollow tube manufacturing equipment. Thus, it is possible to provide a greenhouse hollow tube which can be easily manufactured, has high tightening strength of various joints such as a cross, and is less damaged in a bent portion subjected to bending.
According to the invention of claim 2, the tightening strength of various joints can be further enhanced.
図１に本発明に係る八角形の空管の断面形状を示す。
多角形パイプ同士を十字形を初めとする接合をする際に、パイプ同士の接触面積を大きくするためには、それぞれの断面が四角形、六角形、八角形、十二角形、十六角形のものが考えられるが、このうち断面四角形は、最も接触面積が大きく緊締強度を高くすることができる半面、湾曲加工時に損傷しやすく安定した中空湾曲管の製造が困難である。
FIG. 1 shows the cross-sectional shape of an octagonal hollow tube according to the present invention.
In order to increase the contact area between pipes when joining polygonal pipes with each other starting with a cruciform, each cross section has a square, hexagonal, octagonal, dodecagonal, or dodecagonal shape. Among these, although the cross-sectional quadrangle can provide the largest contact area and high tightening strength, it is easily damaged at the time of curving, and it is difficult to manufacture a stable hollow curved tube.
また、断面六角形のものは十字接合をする際に、図６に示すように、上側の一方の管１と下側の他方の管２は平坦部同士が面接触するものの、一方の管１と十字接手３の断面門形の巻回部３１内面との接触面の数は３、十字接手３の両側に形成された六角中空管に対応する受け部３２の辺縁とそこに挿通された他方の管２との接触部の数は表裏夫々２となる。
これは、一方の管１の下面は十字接手３の受け部３２の上縁３２１より下側に位置して、両者は接触しないためである。
Moreover, when cross-section hexagonal ones are joined in a cruciform, as shown in FIG. 6, one tube 1 on the upper side and the other tube 2 on the lower side make flat contact with each other, but one tube 1 The number of contact surfaces with the inner surface of the winding portion 31 of the cross joint 3 and the cross section of the cross joint 3 is 3, the edge of the receiving portion 32 corresponding to the hexagonal hollow tube formed on both sides of the cross joint 3 and inserted there The number of contact portions with the other pipe 2 is 2 on each side.
This is because the lower surface of one of the tubes 1 is located below the upper edge 321 of the receiving portion 32 of the cross joint 3 so that the two do not contact with each other.
このため、断面六角形の中空管を十字接合をすると、管同士の接触面を大きく確保できる一方、十字接手が中空管を拘束する十字接手自体の中空管拘束力が縮減する。
これに対応するためには、十字接手の鋼材厚みを厚くする必要が生じ、製作コストが嵩むこととなる問題が生じる。
さらに、断面十二角形のものは、断面六角形の中空管に比べ中空管同士の接触面積が想到限定的となり、採用しづらい。
For this reason, when a hollow tube having a hexagonal cross-section is cross-joined, a large contact surface between the tubes can be secured, while the hollow tube restraint force of the cross joint itself in which the cross joint restrains the hollow tube is reduced.
In order to cope with this, it is necessary to increase the thickness of the cross joint steel material, which causes a problem that the manufacturing cost is increased.
Furthermore, in the case of a dodecagonal cross section, the contact area between the hollow tubes is limited as far as possible, as compared to hollow tubes having a hexagonal cross section, and it is difficult to adopt.
これに対し、断面八角形の中空管同士を十字接手する場合は、図２に示されるように、管同士の接触面を適度に大きく確保できるとともに、一方の管１と十字接手３の断面門形の巻回部３１内面との接触面の数は５、とりわけ中空管1の垂直面が拘束され、また、十字接手３の両側に形成された八角中空管２に対応する受け部３２の辺縁とそこに挿通された中空直管２との接触部の数は表裏夫々４となる。
すなわち、中空管同士１、２の接触面積、十字接手３自体の中空管拘束力がバランスよく確保される。
よって、本発明は断面八角形の中空管を採用することとした。
On the other hand, when hollow tubes having an octagonal cross-section are cross-jointed, as shown in FIG. 2, the contact surface between the pipes can be secured appropriately large, and the cross-sections of one tube 1 and the cross joint 3 The number of contact surfaces with the inner surface of the gate-shaped winding portion 31 is 5, in particular, the vertical surface of the hollow tube 1 is restrained, and the receiving portion corresponding to the octagonal hollow tube 2 formed on both sides of the cross joint 3 The number of contact parts between the edge of 32 and the hollow straight pipe 2 inserted therein is 4 on both sides.
That is, the contact area between the hollow tubes 1 and 2 and the hollow tube restraining force of the cross joint 3 itself are secured in a well-balanced manner.
Therefore, the present invention adopts a hollow tube having an octagonal cross section.
この温室用中空管は、温室の棟方向部材である、長さ方向全体に亘って直線状の断面八角形の中空直管と、軒部と屋根部が直線状で中間部が円弧状に湾曲した断面八角形の中空湾曲管との組み合わせから構成されている。 This greenhouse hollow tube is a ridge direction member of a greenhouse, and is a hollow straight tube having an octagonal cross section which is straight along the entire length direction, and the eaves portion and the roof portion are straight and the middle portion is arced. It consists of a combination of a curved curved octagonal hollow curved tube.
そして、一対の中空湾曲管は、互いの湾曲部が凸状態、温室の棟部となる上端部において軸方向に接合され、図５に示されるように、略馬蹄形のアーチ部材４とされるものである。
このアーチ部材４の外面１２と内面１１、すなわち中空湾曲管の湾曲部の最も外側に位置する湾曲外面と最も内側に位置する湾曲内面が平坦面とされ、決して角部が上記した湾曲外面や湾曲内面に存在することはない。
この構成によって、棟方向に間隔を置いて建て込まれる多数のアーチ部材４を構成する中空湾曲管１と、棟方向に配設される中空直管２との接合部は、それぞれの管の平坦部同士が対向して直接接触することとなり、大きな接触面積が確保されるものである。
Then, the pair of hollow curved tubes are joined in the axial direction at the upper end portion which becomes the ridge portion of the greenhouse, with the curved portions thereof in a convex state, and as shown in FIG. It is.
The outer surface 12 and the inner surface 11 of the arch member 4, that is, the outermost surface of the curved portion of the hollow curved tube and the inner surface of the innermost curved surface are flat surfaces, and the corner portion is the above-mentioned outer surface and the curved surface. It does not exist inside.
According to this configuration, the joint portion between the hollow curved tubes 1 constituting the multiple arch members 4 erected at intervals in the ridge direction and the hollow straight tubes 2 disposed in the ridge direction is flat surfaces of the respective tubes. The parts face each other and come into direct contact, and a large contact area is secured.
図２にアーチ部材の構成部材である中空湾曲管１と中空直管２の十字接手３の接手構造を示す。
図２左は、十字接手構造を温室妻面からみた正面図で、同図右は、その側面図である。
FIG. 2 shows a joint structure of the hollow curved tube 1 which is a component of the arch member and the cross joint 3 of the hollow straight pipe 2.
The left of FIG. 2 is a front view of the cross joint structure viewed from the side of a greenhouse, and the right of the same is a side view thereof.
この十字接手３は、中空丸管用の従来周知の十字接手を八角中空管用に変更したもので、中空湾曲管１に十字接手３の断面門形の巻回部３１を当て、該十字接手３の両側に形成された八角中空管に対応する受け部３２に中空直管２を入れ、この十字接手の下部に形成された係合片３３に楔部材３４を打ち込むことによって中空直管２を上記中空湾曲管１に緊締するようにした。 The cross joint 3 is obtained by changing a conventionally known cross joint for a hollow round tube to that for an octagonal hollow pipe, and the hollow curved tube 1 abuts on the winding portion 31 of the cross-sectional portal shape of the cross joint 3. The hollow straight pipe 2 is inserted into the receiving portion 32 corresponding to the octagonal hollow pipe formed on both sides, and the hollow straight pipe 2 is inserted into the engaging piece 33 formed in the lower part of the cross joint by driving the wedge member 34. It was tightened to the hollow curved tube 1.
これら図面をみて明らかなように、本発明に係るそれぞれの八角形中空管は、互いにその平坦部同士が相対して接触している。
このため、本発明の温室用中空管は、従来の中空丸管同士が接合されたときの点接触の接触面積に比し、格段に広い接触面積を確保できるので、強固な緊締強度を得ている。
As apparent from these drawings, the respective octagonal hollow tubes according to the present invention are in contact with each other with their flat portions facing each other.
For this reason, the hollow tube for a greenhouse of the present invention can secure a much larger contact area as compared to the contact area of point contact when conventional hollow round tubes are joined to each other, so that a strong tightening strength is obtained. ing.
図３に示した十字接手３は、図５に示される温室の中空湾曲管１が軸方向に連結パイプ４１にて接合されたアーチ部材４の屋根部、軒部、裾部等の直線部分と中空直管２の交叉部において緊締金具として用いられる。 The cross joint 3 shown in FIG. 3 is a straight portion such as a roof, an eaves and a skirt of the arch member 4 in which the hollow curved tube 1 of the greenhouse shown in FIG. It is used as a clamp at the intersection of the hollow straight pipe 2.
図３に示す十字接手は、温室の棟部における十字接手３である。
４１は断面八角形の中空湾曲管１の上端部同士をその両端部に挿入して、両者を軸方向に連結して全体としてアーチ状のアーチ部材４とする連結パイプである。
この連結パイプ４１は、八角形の中空湾曲管１が両端部に挿入されるものであるから、当然にその断面形状は全長に亘って中空八角形とされている。
The cross joint shown in FIG. 3 is the cross joint 3 in the ridge of the greenhouse.
Reference numeral 41 denotes a connecting pipe in which the upper end portions of the hollow curved tube 1 having an octagonal cross section are inserted into both ends thereof, and the both are axially connected to form an arch member 4 as a whole.
In this connection pipe 41, since the octagonal hollow curved tube 1 is inserted at both ends, naturally the cross-sectional shape is a hollow octagon over the entire length.
また、この連結パイプ４１の中央部４２は、連結パイプ４１と中空直管２及び連結パイプ４１と十字接手３のそれぞれの接触面積を大きくするために、水平方向に直線形としてある。
これにより、連結パイプ４１の下面と中空直管２の上面のそれぞれの平坦部同士が対向するとともに、連結パイプ４１の上面と十字接手３の内面のそれぞれの平坦部同士が対向し、十字接手３によって緊締される際に三者が直接面接触して、棟部における交叉部の緊締強度も他の十字接手部と同様に強化されている。
Further, the central portion 42 of the connecting pipe 41 has a straight shape in the horizontal direction in order to increase the contact areas of the connecting pipe 41 and the hollow straight pipe 2 and the connecting pipe 41 and the cross joint 3 respectively.
Thereby, the flat portions of the lower surface of the connecting pipe 41 and the upper surface of the hollow straight pipe 2 face each other, and the flat portions of the upper surface of the connecting pipe 41 and the inner surface of the cross joint 3 face each other. The three members are in direct surface contact when tightening is performed, and the tightening strength of the intersection in the ridge is also strengthened like the other cross joint.
一方、温室においては、骨組み表面にビニールフィルム等の合成樹脂製被覆材を被覆することが多く行われている。
図４に、断面八角形のアーチ部材４に、上記合成樹脂製被覆材を被覆するための鳩尾状溝を有するフイルム受け部材５を固定する、フイルム受け部材固定装置６を示す。
On the other hand, in the greenhouse, the surface of the frame is often covered with a synthetic resin covering material such as a vinyl film.
FIG. 4 shows a film receiving member fixing device 6 for fixing a film receiving member 5 having a dovetail groove for covering the synthetic resin covering material on an arch member 4 having an octagonal cross section.
このフイルム受け部材固定装置６は、中空湾曲管１を受け入れる断面倒コ字形の巻回部６１と、中空湾曲管１をフイルム受け部材５底面に押し付ける楔６２とから構成されている。
また、上端部にはフイルム受け部材５を受け入れその斜め外壁を係止する係止部を備え、楔６２と協同してフイルム受け部材５と中空湾曲管１を圧接するものである。
The film receiving member fixing device 6 includes a winding portion 61 having a U-shaped cross section for receiving the hollow curved tube 1 and a wedge 62 for pressing the hollow curved tube 1 against the bottom surface of the film receiving member 5.
Further, the upper end portion is provided with a locking portion for receiving the film receiving member 5 and locking the oblique outer wall, and pressing the film receiving member 5 and the hollow curved tube 1 in cooperation with the collar 62.
フイルム受け部材５の底面は平坦部とされているため、中空湾曲管１の湾曲外面１１の平坦部と直接接触して圧接され強力な緊締力を確保している。
このように、中空湾曲管１と中空直管２は断面八角形の中空管とされ、その上フイルム受け部材５の溝形状が鳩尾状であるため、十字接手３あるいはフイルム受け部材固定装置６の緊締力は、平坦面同士が接触して緊締されることから、広い面積での面接触が得られ、強い緊締力が確保されるものである。
特に、本発明の断面八角形の中空管同士の十字接手は、断面円形の中空管同士のそれの緊締力に比べ、上記したように格段に強化されていることが理解されよう。
Since the bottom surface of the film receiving member 5 is a flat portion, the film receiving member 5 is in pressure contact with the flat portion of the curved outer surface 11 of the hollow curved tube 1 to secure a strong tightening force.
As described above, since the hollow curved tube 1 and the hollow straight tube 2 are hollow tubes having an octagonal cross section and the groove shape of the film receiving member 5 is a dovetail shape, the cross joint 3 or the film receiving member fixing device 6 Since the flat surfaces are in contact with each other and tightened, surface contact in a wide area is obtained, and a strong tightening force is secured.
In particular, it will be appreciated that the cross joint of the hollow tubes of octagonal cross section according to the present invention is significantly enhanced as described above, compared to the tightening force of hollow tubes of circular cross section.
また、中空湾曲管１と中空直管２の全表面あるいは接合部位を梨地加工等することにより、表面に粗面を形成して摩擦係数を増大しておけば、さらに断面八角形の中空管同士の十字接手の緊締力はさらに増大される。 In addition, if the rough surface is formed on the surface by roughening the entire surface or the joint portion of the hollow curved tube 1 and the hollow straight tube 2 to increase the friction coefficient, the hollow tube having an octagonal cross section is further obtained. The tightening force of the cross joint between each other is further increased.
１ 中空湾曲管
１１ 管内面
１２ 管外面
２ 中空直管
３ 十字接手
４ アーチ部材
４１ 連結パイプ
４２ 直線部
５ フイルム受け部材
６ フイルム受け部材固定装置
Reference Signs List 1 hollow curved tube 11 tube inner surface 12 tube outer surface 2 hollow straight tube 3 cross joint 4 arch member 41 connecting pipe 42 straight portion 5 film receiving member 6 film receiving member fixing device
Claims (2)
骨組み材が、中空直管と湾曲部を備えた中空湾曲管を含んでおり、該骨組み材同士は接触交差して接合されるものであって、
中空直管と中空湾曲管の断面が八角形である八角形中空管材であり、
更に、門形であって、上部側に八角中空管の断面の内５面に接する曲折面を有する巻回部と、下部側面側に八角中空管の断面の内５面に対応する受け部を有する十字接手とを備えていることを特徴とする植物栽培用施設の骨組み材。 It is a framework for plant cultivation facilities using a hollow curved tube having a hollow straight tube and a curved portion as the framework,
The framework includes a hollow straight tube and a hollow curved tube having a curved portion, and the frameworks are joined in contact crossing.
Octagonal hollow tubing der section of hollow straight tube and the hollow bent tube is octagonal is,
Furthermore, it has a gate shape and a winding portion having a bent surface contacting the inner five surfaces of the cross section of the octagonal hollow tube at the upper side, and a receiver corresponding to the inner five surfaces of the cross section of the octagonal hollow tube at the lower side framework material for plant cultivation facilities characterized that you have a cross catch having a part.
中空湾曲管は、一方端が直線状の温室の軒部で、他端が略直線状の温室の屋根部で、中間部が円弧状に湾曲した湾曲部である断面八角形の中空湾曲管であり、
温室において中空直管と中空湾曲管が交差する接合部を有しており、
交差する接合部において、中空直管と中空湾曲管が、門形であって、上部側に八角中空管の断面の内５面に接する曲折面を有する巻回部と、下部側面側に八角中空管の断面の内５面に対応する受け部を有する十字接手によって両者が交差接合されるものであって、
交差部において中空直管と中空湾曲管は八角形の平面同士が接触交差となることを特徴とする請求項１記載の植物栽培用施設の骨組み材。 The hollow straight pipe is a hollow straight pipe having an octagonal cross section which is straight over the entire length direction,
The hollow curved tube is an octagonal hollow curved tube whose one end is the eaves of a straight greenhouse and the other end is a substantially straight roof of a greenhouse and the middle part is a curved curve curved like an arc. Yes,
Hollow straight tube and the hollow Bay curved pipe has a joint that crosses in the greenhouse,
In the crossing junction, the hollow straight tube and the hollow curved tube are in the shape of a gate, and the winding portion has a bent surface contacting the inner five surfaces of the cross section of the octagonal hollow tube on the upper side, and the octagonal side on the lower side The two are cross-joined together by a cross joint having a receiving portion corresponding to the five inner surfaces of the cross section of the hollow tube,
The frame member of the plant cultivation facility according to claim 1, wherein the octagonal flat surfaces of the hollow straight pipe and the hollow curved pipe are in contact with each other at the intersection.
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| JP2017200054A JP6548705B2 (en) | 2017-10-16 | 2017-10-16 | Octagonal hollow tube for greenhouse |
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| JPH1163305A (en) * | 1997-08-26 | 1999-03-05 | Matsushita Electric Works Ltd | Fixing structure |
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