JP5299813B2 - Void unit used for hollow slab method - Google Patents

Void unit used for hollow slab method Download PDF

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JP5299813B2
JP5299813B2 JP2008206341A JP2008206341A JP5299813B2 JP 5299813 B2 JP5299813 B2 JP 5299813B2 JP 2008206341 A JP2008206341 A JP 2008206341A JP 2008206341 A JP2008206341 A JP 2008206341A JP 5299813 B2 JP5299813 B2 JP 5299813B2
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void
portions
unit
holding member
support
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JP2010019062A (en
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繁 森永
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Eifs Japan
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/326Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements
    • E04B5/328Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements the filling elements being spherical

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a void unit with a new structure improved in mechanical strength, reduced in cost, and simplified in the work process for forming a slab. <P>SOLUTION: The void unit SU comprises supporting bars 1a, 1b, a retention member 2 fixed to the supporting bars 1a, 1b, and the slab 3 fitted to the retention member 2. The retention member 2 comprises supporting parts 2c, 2c of a predetermined length fixed to the supporting bars 1a, 1b, and grasping parts 2a, 2b formed by bending at both ends of the supporting parts 2c, 2c at a predetermined angle &theta; so that they may incline and face each other. The grasping parts 2a, 2b respectively have arm parts extending from the supporting parts 2c, 2c and facing each other, and curve parts extending at front ends of the arm parts. The slab 3 is held between the grasping parts 2a, 2b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、スラブを形成するためのボイドユニット、ボイドユニットの製造方法、ボイドユニット用いた中空スラブ工法に関するものである。スラブ(Slab)とは、コンクリート製の板または床版のことであり、鉄筋コンクリート造における、基礎床や上階住戸と下階住戸の間にある構造床のことである。また、中空スラブ工法はボイドスラブ工法とも呼ばれている。The present invention relates to a void unit for forming a slab, a method for manufacturing the void unit, and a hollow slab method using the void unit. A slab is a concrete board or floor slab, and is a structural floor between a foundation floor or an upper-floor dwelling unit and a lower-floor dwelling unit in a reinforced concrete structure. The hollow slab method is also called a void slab method.

例えば建築物の床版などを形成する工法として、発泡スチロール等で形成されたボイドと呼ばれる埋設体をコンクリート内に埋設し、軽量化、断熱性、遮音性などに優れたスラブを形成する中空スラブ工法が知られている。For example, as a method of forming building floor slabs, etc., a hollow slab method is to form a slab that is excellent in weight reduction, heat insulation, sound insulation, etc. It has been known.

中空スラブ工法では、一般に、型枠工事によって構造躯体である鉄筋を碁盤の目状に配筋し、鉄筋にて囲まれた隔室内の夫々にボイドを配設してコンクリートを打設することにより、スラブを形成している。In the hollow slab method, in general, reinforcing bars, which are structural frames, are arranged in the form of a grid by formwork, and voids are placed in each of the compartments surrounded by the reinforcing bars to place concrete. , Forming a slab.

ところが、ボイドがコンクリートより比重の小さい発泡スチロール等で形成されている場合、コンクリートを打設する際にボイドが浮き上がって位置ずれが生じると、構造上の等方向性が得られず部分的に強度の弱い不均一なスラブが形成されてしまう等の問題を招来する。However, when the void is made of polystyrene foam having a specific gravity smaller than that of concrete, if the void rises when the concrete is placed and misalignment occurs, structural isodirectionality cannot be obtained and the strength is partially increased. This causes problems such as the formation of weak non-uniform slabs.

そこで、ボイドと固定治具とを組み合わせたユニット構造を有するボイドユニットを予め形成しておき、型枠工事の際にそのボイドユニットを鉄筋にて囲まれた隔室内に取り付けてコンクリートを打設する中空スラブ工法が提案されている(特許文献1、2を参照)。
特開2005−163340号公報 特開2006−89994号公報
Therefore, a void unit having a unit structure in which a void and a fixing jig are combined is formed in advance, and the void unit is attached in a compartment surrounded by a reinforcing bar during the construction work, and concrete is placed. A hollow slab method has been proposed (see Patent Documents 1 and 2).
JP 2005-163340 A JP 2006-89994 A

ところで、特許文献1に開示されているボイドユニットは、同文献の図1〜図3に示されているように、球形のボイドの一端に嵌入孔が形成されており、支持筋に固定された固定片をその嵌入孔内に嵌め込んでボイドと支持筋とを一体に固定したユニット構造を有している。そして、型枠工事の際にそのボイドユニットを鉄筋で囲まれた隔室内に配設して、鉄筋と支持筋とを結束し、コンクリートを打設する際にボイドの移動を抑制することとしている。By the way, as shown in FIGS. 1 to 3 of the document, the void unit disclosed in Patent Document 1 has an insertion hole formed at one end of a spherical void, and is fixed to the support muscle. It has a unit structure in which a fixed piece is fitted into the insertion hole and the void and the supporting muscle are fixed integrally. Then, the void unit is disposed in the compartment surrounded by the reinforcing bars during the formwork work, and the reinforcing bars and the supporting bars are bound to suppress the movement of the voids when placing concrete. .

しかしながら、特許文献1に開示されているボイドユニットでは、例えば工事現場への搬送の際や、鉄筋で囲まれた隔室内に配設する作業中等において、ボイドに形成された嵌入孔が固定片によって擦れたり破損して大きくなり、嵌入孔と固定片との嵌合が弛んで不安定となったり、固定片からボイドが脱落し易い等の問題がある。However, in the void unit disclosed in Patent Document 1, the insertion hole formed in the void is formed by the fixing piece, for example, when transporting to a construction site or during the operation of arranging in a compartment surrounded by a reinforcing bar. There are problems such as rubbed or broken, and the fitting between the fitting hole and the fixing piece becomes loose and unstable, and voids easily fall off from the fixing piece.

特許文献2に開示されているボイドユニットは、同文献の図1〜図3に示されているように、球状のボイドの一端に形成された係止溝内に係止筋を嵌め込んで接着剤等で固着した構造を有している。また、同文献の図4に示されているボイドユニットは、球形のボイドの一端に係止筋を埋設又は貫通させた構造を有している。そして、これら図1〜図3及び図4に示されているボイドユニットのボイドを鉄筋で囲まれた隔室内に配設して、鉄筋と係止筋とを結束し、コンクリートを打設する際にボイドの移動を抑制することとしている。As shown in FIGS. 1 to 3 of the same document, the void unit disclosed in Patent Document 2 is bonded by inserting a locking bar into a locking groove formed at one end of a spherical void. It has a structure fixed with an agent or the like. Further, the void unit shown in FIG. 4 of the same document has a structure in which a locking bar is embedded or penetrated at one end of a spherical void. When the voids of the void unit shown in FIGS. 1 to 3 and FIG. 4 are arranged in a compartment surrounded by reinforcing bars, the reinforcing bars and the locking bars are bound, and concrete is placed. The movement of the void is suppressed.

更に、特許文献2の図5〜図23には、球形のボイド内に帯状保持部材を埋設したり、球形のボイドに形成された溝内に帯状保持部材を嵌め合わせて固定し、帯状保持部材の湎端にフックが形成された構造を有するボイドユニットが開示されている。これらのボイドユニットに設けられているボイドを鉄筋で囲まれた隔室内に配設し、鉄筋にフック等を固定してコンクリートを打設する際にボイドの移動を抑制することとしている。Further, in FIGS. 5 to 23 of Patent Document 2, a band-shaped holding member is embedded in a spherical void, or a band-shaped holding member is fitted and fixed in a groove formed in a spherical void. There is disclosed a void unit having a structure in which a hook is formed at the heel end. The voids provided in these void units are arranged in a compartment surrounded by reinforcing bars, and the movement of the voids is suppressed when placing concrete with a hook or the like fixed to the reinforcing bars.

しかしながら、特許文献2の図1〜図23に示されているこれらのボイドユニットでは、ボイドに係止筋や帯状保持部材を固定するためにボイドを加工する必要があるため、ボイドユニットの製造コストが高くなる等の問題がある。更に、ボイドの一端に係止筋や帯状保持部材が固定されるため、係止筋や帯状保持部材が固定されるボイドの一端が破損し易いこと、係止筋や帯状保持部材からボイドが脱落し易いこと等の問題がある。However, in these void units shown in FIGS. 1 to 23 of Patent Document 2, since it is necessary to process the voids in order to fix the locking bars and the belt-like holding members to the voids, the manufacturing cost of the void unit is required. There are problems such as high. Furthermore, since the locking bars and the band-shaped holding member are fixed to one end of the void, the one end of the void to which the locking bars and the band-shaped holding member are fixed is easily damaged, and the void is dropped from the locking bars and the band-shaped holding member. There are problems such as being easy to do.

本発明は、上述した従来技術の問題点に鑑みて成されたものであり、スラブを形成するために配筋された鉄筋にボイドを確実に固定することができると共に、機械的強度の高い新規な構造を有するボイドユニットを提供することを目的とする。また、コストの低減を図ることができ、また、スラブを形成する際の作業工程を簡素化することができる新規な構造を有するボイドユニットを提供することを目的とする。The present invention has been made in view of the above-described problems of the prior art, and can firmly fix a void to a reinforcing bar arranged to form a slab and has a high mechanical strength. An object of the present invention is to provide a void unit having a simple structure. It is another object of the present invention to provide a void unit having a novel structure capable of reducing costs and simplifying a work process when forming a slab.

上記目的を達成するため、本発明のボイドユニットは、打設されるコンクリート内に埋設してスラブを形成するためのボイドユニットであって、支持筋と、前記支持筋に固着された保持部材と、前記保持部材に嵌め込まれたボイドと、を備え、前記保持部材は、前記支持筋に固着される所定長さの支承部と、前記支承部の両端から所定の角度で曲げ加工されて外側へ傾斜する互いに対向する第1,第2の挟持部とを有し、前記第1,第2の各々の挟持部は、前記支承部から延在し互いに対向する第1,第2の腕部と当該腕部の先端に延在する湾曲部を有し、前記第1,第2の挟持部の間に前記ボイドが挟持されていること、を特徴とする。To achieve the above object, a void unit of the present invention, a void unit for forming and embedded in the concrete is pouring the slab, and supporting muscles, and fixed retention member to the support muscle And a void fitted into the holding member, and the holding member is bent at a predetermined angle from both ends of the support portion and a support portion having a predetermined length to be fixed to the support bar, and outward. The first and second sandwiching portions that face each other, and each of the first and second sandwiching portions extends from the support portion and faces each other. It has a curved portion extending at the tip of the arm portion, and the void is sandwiched between the first and second clamping portions.

本発明の好適な実施の形態について、図1〜図5を参照して説明する。A preferred embodiment of the present invention will be described with reference to FIGS.

図1(a)と(b)は、本実施形態のボイドユニットSUの構造を示す斜視図と分解斜視図、図2(a)は、ボイドユニットSUを上方より見た場合の平面図、図2(b)は、ボイドユニットSUを横から見た場合の側面図である。1A and 1B are a perspective view and an exploded perspective view showing the structure of the void unit SU of the present embodiment, and FIG. 2A is a plan view when the void unit SU is viewed from above, FIG. 2 (b) is a side view when the void unit SU is viewed from the side.

図3(a)(b)は、保持部材の構造と製造方法を説明するための説明図である。図4は、ボイドユニットSUを用いてスラブを形成する際の中空スラブ工法を説明するための説明図である。図5は、本実施形態の変形例に係るボイドユニットSUの構造を示す斜視図である。3A and 3B are explanatory views for explaining the structure and manufacturing method of the holding member. FIG. 4 is an explanatory diagram for explaining a hollow slab method for forming a slab using the void unit SU. FIG. 5 is a perspective view showing the structure of a void unit SU according to a modification of the present embodiment.

図1(a)において、このボイドユニットSUは、金属製の棒鋼である2本の平行な支持筋1a,1bと、可撓性を有する金属製の棒鋼を曲げ加工して骨組みだけの篭状に形成された複数個の保持部材2と、周知の発泡スチロール等で形成された、略球形又は略楕円体形の埋設体である複数個のボイド3とを備え、保持部材2が支持筋1a,1bに所定間隔をおいて溶接等によって固着され、各々のボイド3が各々の保持部材2によって挟持された構造を有している。In FIG. 1 (a), this void unit SU is a saddle-shaped frame made by bending two parallel support bars 1a and 1b, which are metal steel bars, and a flexible metal steel bar. And a plurality of voids 3 formed of a well-known foamed polystyrene or the like , which are embedded in a substantially spherical shape or a substantially elliptical shape , and the holding member 2 has support muscles 1a and 1b. Are fixed to each other by welding or the like, and each void 3 is sandwiched by each holding member 2.

ボイド3は、周知の発泡スチロール等で形成されたものであるが、略球形又は略楕円体形であることを特徴としている。The void 3 is formed of a well-known foamed polystyrene or the like , and is characterized by being substantially spherical or substantially elliptical .

各々の保持部材2は、図3(a)に示すように、棒鋼をほぼ長円形の環状に加工して半製品2’を形成し、その長円形の略中央に位置する4カ所の部分α,αとβ,βを夫々所定の角度(鈍角)θに折り曲げ加工することで形成され、図3(b)に示すように正面から見るとハ字状の形状に曲げ加工されている。そして、上述の曲げ加工が施された曲げ部α,αとβ,βとの間の2カ所の部分が支承部2c,2cとなっており、支承部2c,2cから両側に角度θでハ字状に傾斜して延在するU字状の部分が挟持部2a,2bとなっている。As shown in FIG. 3 (a), each holding member 2 is processed into a semi-finished product 2 'by processing a steel bar into a substantially oval annular shape, and four portions α located substantially at the center of the oval are formed. , Α, β, and β are each bent by a predetermined angle (obtuse angle) θ, and are bent into a letter C shape when viewed from the front as shown in FIG. The two portions between the bent portions α, α and β, β subjected to the bending process described above are the support portions 2c, 2c, and both sides of the support portions 2c, 2c are angled at an angle θ. U-shaped portions extending in a slanted shape are sandwiching portions 2a and 2b.

更に、挟持部2aの先端部分が円弧状に湾曲形成された湾曲部2av、曲げ部α,αと湾曲部2av間の部分が互いに対向する腕部2as,2atとなっている。更に、挟持部2bの先端部分も円弧状に湾曲形成された湾曲部2bv、曲げ部β,βと湾曲部2bv間の部分も互いに対向する腕部2bs,2btとなっている。そして、湾曲部2avと2bvがほぼ同形状、腕部2as,2atと2bs,2btがほぼ同形状となっている。Further, the tip portion of the sandwiching portion 2a is a curved portion 2av that is curved in an arc shape, and the portions between the bent portions α and α and the curved portion 2av are arm portions 2as and 2at that face each other. Further, the front end portion of the sandwiching portion 2b is also a curved portion 2bv that is curved in an arc shape, and the portions between the bent portions β and β and the curved portion 2bv are also arm portions 2bs and 2bt that face each other. The curved portions 2av and 2bv have substantially the same shape, and the arm portions 2as and 2at and 2bs and 2bt have substantially the same shape.

更に、図3(a)に示した腕部2asと2atとの間隔WLと腕部2bsと2btとの間隔WLは、図2(a)に示すように、ボイド3の直径Rよりも小さく且つボイド3の半径R/2よりも大きい範囲内の何れかの所定の幅に設計されている。Further, the interval WL between the arm portions 2as and 2at and the interval WL between the arm portions 2bs and 2bt shown in FIG. 3A are smaller than the diameter R of the void 3 as shown in FIG. It is designed to have any predetermined width within a range larger than the radius R / 2 of the void 3.

更に、曲げ部α,αから湾曲部2avの先端までの長さLaと曲げ部β,βから湾曲部2bvの先端までの長さLbは、図3(b)中に仮想円で示す直径Rのボイド3が保持部材2に嵌め込まれた場合に、湾曲部2avと2bvがボイド3の中心Qよりも下方側の球面(表面)に接触し、且つその接触部分から中心Qに向かって斜め方向へ付勢することとなるように決められている。更に、角度θは、支承部2c,2cの長さLcよりも、湾曲部2avの先端と湾曲部2bvの先端との対向間隔の方が大きくなるように、鈍角に設定されている。Furthermore, the length La from the bent portions α and α to the tip of the curved portion 2av and the length Lb from the bent portions β and β to the tip of the curved portion 2bv are the diameters R indicated by virtual circles in FIG. When the void 3 is fitted into the holding member 2, the curved portions 2av and 2bv are in contact with the spherical surface (surface) below the center Q of the void 3 and obliquely move from the contact portion toward the center Q. It has been decided to be energized. Furthermore, the angle θ is set to an obtuse angle so that the facing distance between the distal end of the bending portion 2av and the distal end of the bending portion 2bv is larger than the length Lc of the support portions 2c, 2c.

こうして形成された各々の保持部材2の支承部2c,2cが、図1(b)に示すように、2本の支持筋1a,1bに対し直交配置され、支承部2c,2c(詳細には、曲げ部α,α,β,βの近傍部分)と支持筋1a,1bとの接触する部分が溶接等によって固着され、各々の保持部材2の挟持部2a,2b間に、下方から球形のボイド3が一つずつ嵌め込まれて、ボイドユニットSUが形成されている。なお、本実施形態のボイドユニットSUは、工事現場とは別個の工場等で製造される。As shown in FIG. 1B, the support portions 2c and 2c of the respective holding members 2 formed in this way are arranged orthogonal to the two support bars 1a and 1b, and the support portions 2c and 2c (in detail). , Adjacent portions of the bent portions α, α, β, β) and the supporting bars 1a, 1b are fixed by welding or the like, and are spherical from below between the holding portions 2a, 2b of the holding members 2. Voids 3 are fitted one by one to form a void unit SU. Note that the void unit SU of the present embodiment is manufactured in a factory or the like separate from the construction site.

そして、工場等で製造されたボイドユニットSUを工事現場へ搬送し、図4に示すように、型枠工事によって碁盤の目状に配筋された多数の鉄筋Aにて囲まれた多数の隔室内の夫々に、ボイドユニットSUのボイド3を1つずつ配設し、支持筋1a,1bと鉄筋Aとを結束線等にて結束し、コンクリートを打設することによってスラブが形成される。また、ボイドユニットSUには限られた複数個のボイド3が設けられているため、スラブを形成するための面積に応じて、適宜の数のボイドユニットSUを並べて配設し、コンクリートを打設するようになっている。Then, the void unit SU manufactured in a factory or the like is transported to the construction site, and as shown in FIG. 4, a large number of spaces surrounded by a large number of rebars A arranged in a grid pattern by mold work. A slab is formed by disposing one void 3 of each void unit SU in each room, bundling the supporting bars 1a, 1b and the reinforcing bar A with a binding wire or the like, and placing concrete. Also, since the voids unit SU a plurality of voids 3 a limited provided, in accordance with the area for forming the slab, and arranged side by side voids unit SU appropriate number of concrete Da設It is supposed to be.

以上に説明した本実施形態のボイドユニットSUによると、次に述べるような効果が得られる。According to the void unit SU of the present embodiment described above, the following effects can be obtained.

つまり、ボイドユニットSUは、図1、図2等に示したように、支持筋1a,1bとU字状の挟持部2a,2bとによって画成された空間内にボイド3が嵌め込まれ、更に支持筋1a,1bと可撓性を有する挟持部2a,2bとによってボイド3が挟持され且つ把持された構造を有している。このため、保持部材2からボイド3が脱落したり、保持部材2内でボイド3が移動したりガタつく等の問題の発生を未然に防止することができ、ひいては、型枠工事によって碁盤の目状に配筋された多数の鉄筋Aにて囲まれた多数の隔室内の夫々に、ボイドユニットSUのボイド3を確実に固定してコンクリートを打設することができる。That is, in the void unit SU, as shown in FIGS. 1 and 2, the void 3 is fitted in the space defined by the support bars 1a and 1b and the U-shaped sandwiching portions 2a and 2b. The void 3 is sandwiched and gripped by the supporting muscles 1a and 1b and the flexible sandwiching portions 2a and 2b. For this reason, it is possible to prevent problems such as the drop of the void 3 from the holding member 2, the movement of the void 3 within the holding member 2, and the rattling. Concrete can be placed by securely fixing the void 3 of the void unit SU in each of a large number of compartments surrounded by a large number of reinforcing bars A arranged in a shape.

更に、本実施形態のボイドユニットSUは、ボイド3に穴や溝を形成してその穴や溝に保持部材2を嵌め込むといった従来技術ような構造ではなく、ボイド3を挟持部2a,2bによって確実に挟持し且つ把持する構造であることから、ボイド3に対して加工を施す必要がない。そのため、ボイドユニットSUの製造コストを低減することが可能となり、更に、ボイド3に損傷を与えることなく機械的強度の大きいボイドユニットSUを提供することができる。Furthermore, the void unit SU of the present embodiment is not a structure as in the prior art in which a hole or groove is formed in the void 3 and the holding member 2 is fitted into the hole or groove, but the void 3 is sandwiched between the holding portions 2a and 2b. Therefore, it is not necessary to process the void 3. Therefore, it is possible to reduce the manufacturing cost of the void unit SU, and further, it is possible to provide the void unit SU having high mechanical strength without damaging the void 3.

更に、本実施形態のボイドユニットSUは、保持部材2の挟持部2a,2b間にボイド3を挿入して嵌め込むだけで、ボイド3を取り付けることができるため、ボイドユニットSUの製造工程を大幅に簡素化することができ、コスト低減を図ることが可能である。更に、ボイドユニットSUの構造が簡素であることから、コスト低減を図ることが可能である。Furthermore, since the void unit SU of this embodiment can be attached only by inserting and inserting the void 3 between the holding portions 2a and 2b of the holding member 2, the manufacturing process of the void unit SU is greatly increased. Therefore, the cost can be reduced. Furthermore, since the structure of the void unit SU is simple, it is possible to reduce the cost.

更に、ボイドユニットSUを工場等で量産(製造)し、その製造したボイドユニットSUを工事現場へ搬送して、スラブを形成するための工事を行うことができる。このため、スラブを形成するための工事を簡素化することが可能である。更に、量産化によって、ボイドユニットSUの製造コストを低減することができるという効果も得られる。Furthermore, the void unit SU can be mass-produced (manufactured) in a factory or the like, and the manufactured void unit SU can be transported to a construction site to perform construction for forming a slab. For this reason, it is possible to simplify the construction for forming the slab. Furthermore, the effect that the manufacturing cost of void unit SU can be reduced by mass production is also acquired.

なお、図1、図2等に示したボイドユニットSUでは、2本の支持筋1a,1bに保持部材2を溶接等によって固着する構造となっているが、2本の支持筋1a,1bを1本に減らし、図5に示すように1本の支持筋1に複数の保持部材2を溶接等によって固着する構造としてもよい。ただし、図5に示す構造を有するボイドユニットSUとする場合には、強固な構造とするために、各々の支承部2c,2cの中間部分に支持筋1を配置して溶接等を施して固着することが望ましい。The void unit SU shown in FIGS. 1 and 2 has a structure in which the holding member 2 is fixed to the two support bars 1a and 1b by welding or the like, but the two support bars 1a and 1b are fixed. The number may be reduced to one, and a plurality of holding members 2 may be fixed to one support bar 1 by welding or the like as shown in FIG. However, when the void unit SU having the structure shown in FIG. 5 is used, in order to obtain a strong structure, the support bars 1 are arranged at intermediate portions of the support portions 2c and 2c, and are fixed by welding or the like. It is desirable to do.

そして、図5に示す構造のボイドユニットSUにおいても、各々の保持部材2の挟持部2a,2bと支持筋1との間にボイド3が挟持及び把持されるため、図1、図2等に示したボイドユニットSUと同様の効果が得られる。また、1本の支持筋1に減らすことで、その分の製造コストを減らすことができる等の効果が得られる。In the void unit SU having the structure shown in FIG. 5, since the void 3 is sandwiched and held between the sandwiching portions 2 a and 2 b of each holding member 2 and the supporting muscle 1, FIG. The same effect as the void unit SU shown can be obtained. Further, by reducing the number of support bars 1 to one, it is possible to obtain an effect that the manufacturing cost can be reduced accordingly.

次に、上記実施形態のより具体的な実施例について、図6を参照して説明する。Next, a more specific example of the above embodiment will be described with reference to FIG.

実施例1のボイドユニットSUは、図1、図2等に示した実施形態のボイドユニットと基本的に同じ構造を有している。そこで、ボイドユニットSUの詳細な形状、構造、製造方法等について説明することとする。The void unit SU of Example 1 has basically the same structure as the void unit of the embodiment shown in FIGS. Therefore, the detailed shape, structure, manufacturing method and the like of the void unit SU will be described.

図6は、図1、図2等に示した保持部材2によって球形のボイド3を保持するための1カ所の構造を代表して示す正面図であり、図3(b)に対応している。FIG. 6 is a front view representatively showing one structure for holding the spherical void 3 by the holding member 2 shown in FIG. 1, FIG. 2, etc., and corresponds to FIG. .

保持部材2の製造方法を説明することでボイドユニットSUの構造を詳細に説明することとすると、まず、図3(a)に示したように、可撓性を有する金属製の棒鋼(具体的には直径が約2.8mmの中実な棒鋼)を曲げ加工することで、長円形の半製品2’を形成する。When the structure of the void unit SU is described in detail by explaining the manufacturing method of the holding member 2, first, as shown in FIG. Is formed by bending a solid steel bar having a diameter of about 2.8 mm to form an oval semi-finished product 2 ′.

ここで、図3(a)に示した長円形の長手方向の幅WHと、長手方向に対して直交する短径方向の幅WLと、その長円形のほぼ中央の部分に位置する4カ所の曲げ部α,αとβ,β間に形成される支承部2c,2cの長さLcが、ボイドの直径Rとの関係に基づいて、次のように決めて設計されている。Here, the width WH in the longitudinal direction of the ellipse shown in FIG. 3A, the width WL in the minor axis direction orthogonal to the longitudinal direction, and four locations located in the substantially central part of the ellipse. The length Lc of the support portions 2c, 2c formed between the bent portions α, α and β, β is determined and designed as follows based on the relationship with the diameter R of the void.

つまり、まず、図6に示すように、直径R(具体的には、直径160mm)の略球形のボイド3が嵌め込まれるものとして、直径Rの仮想円を描き、その仮想円の一部分が支承部2cの中間位置Pcで接触するものとする。更に、その接触する位置Pcと仮想円の中心Qとを通る仮想軸(+Y,−Y)をY軸、そのY軸に対して中心Qで直交する仮想軸(+X,−X)をX軸とする直交座標系を設定する。That is, first, as shown in FIG. 6, a virtual circle having a diameter R is drawn on the assumption that a substantially spherical void 3 having a diameter R (specifically, a diameter of 160 mm) is fitted, and a part of the virtual circle is a support portion. The contact is made at the intermediate position Pc of 2c. Further, the virtual axis (+ Y, −Y) passing through the contact position Pc and the center Q of the virtual circle is the Y axis, and the virtual axis (+ X, −X) orthogonal to the Y axis at the center Q is the X axis. Set the Cartesian coordinate system.

そして、図3(a)に示した半製品2’の短径方向の幅WLを、設計仕様に準じて、ボイド3の直径Rよりも小さく且つ半径R/2よりも大きい範囲内の何れかの所定の幅(具体的には、約113mm)に決める。Then, the width WL in the minor axis direction of the semi-finished product 2 ′ shown in FIG. 3A is either in a range smaller than the diameter R of the void 3 and larger than the radius R / 2 according to the design specification. The predetermined width (specifically, about 113 mm) is determined.

更に、X軸と仮想円とが交差する位置Qa,Qbよりも下方側の位置Pa,Pbを、湾曲部2av,2bvの先端位置として仮設定し、更に位置Paと中心Qとを結ぶ仮想直線に対して中心Qにおいて直角となる仮想線の方向に曲げ部α,αを設けることとする。更に、位置Pbと中心Qとを結ぶ仮想直線に対して中心Qにおいて直角となる仮想線の方向に曲げ部β,βを設けることとする。Furthermore, positions Pa and Pb below the positions Qa and Qb where the X axis intersects the virtual circle are temporarily set as the tip positions of the curved portions 2av and 2bv, and further, a virtual straight line connecting the position Pa and the center Q. Are bent in the direction of a virtual line perpendicular to the center Q. Further, bent portions β and β are provided in the direction of the imaginary line that is perpendicular to the center Q with respect to the imaginary straight line connecting the position Pb and the center Q.

そして更に、支承部2c,2cの長さLcを支持筋1a,1bの間隔とほぼ等しい長さであって、ボイド3の直径Rよりも小さく且つ半径R/2よりも大きい範囲内の何れかの所定の長さ(具体的には、約60mm)に決め、上述の仮設定した位置Paと曲げ部α,αとの直交関係を維持しつつ、その長さLcの半分の長さ(Lc/2)とX軸から位置Paまでの距離(Y軸上の距離)Lqaとをほぼ等しくする条件を満たすように、位置Paと曲げ部α,αの位置を調整し、その調整した位置Paを最終的に湾曲部2avの先端の位置に決める。Further, the length Lc of the support portions 2c, 2c is approximately equal to the distance between the support bars 1a, 1b, and is within a range smaller than the diameter R of the void 3 and larger than the radius R / 2. The predetermined length (specifically, about 60 mm) is determined, and the half length (Lc) of the length Lc is maintained while maintaining the orthogonal relationship between the temporarily set position Pa and the bent portions α and α. / 2) and the position Pa and the positions of the bent portions α and α are adjusted so that the distance Lqa from the X axis to the position Pa (distance on the Y axis) Lqa is substantially equal, and the adjusted position Pa Is finally determined as the position of the tip of the bending portion 2av.

更に、位置Pbについても同様に、上述の仮設定した位置Pbと曲げ部β,βとの直交関係を維持しつつ、長さLcの半分の長さ(Lc/2)とX軸から位置Pbまでの距離(Y軸上の距離)Lqbとをほぼ等しくする条件を満たすように、位置Pbと曲げ部β,βの位置を調整し、その調整した位置Pbを最終的に湾曲部2bvの先端の位置に決める。Further, similarly for the position Pb, while maintaining the orthogonal relationship between the above-mentioned temporarily set position Pb and the bent portions β and β, the position Pb from the half length Lc (Lc / 2) and the X-axis is maintained. The position Pb and the positions of the bent portions β and β are adjusted so that the distance (distance on the Y axis) Lqb is substantially equal to the distance to the bent portion 2bv. Determine the position.

こうして決められた位置Paと曲げ部α,α間の長さを図3(a)に示した長さLa、位置Pbと曲げ部β,β間の長さを長さLbに決めて、半製品2’を形成する。これにより、長さLaとLbはほぼ等しい長さ(具体的には、約113mm)に設定される。更に、長さLa,Lbを決めることで角度θも決まり、具体的には、約110°となる。The length between the position Pa thus determined and the bent portions α and α is determined as the length La shown in FIG. 3A, and the length between the position Pb and the bent portions β and β is determined as the length Lb. Form product 2 '. Thereby, the lengths La and Lb are set to substantially equal lengths (specifically, about 113 mm). Further, by determining the lengths La and Lb, the angle θ is also determined, specifically, about 110 °.

そして、上述した挟持部2aの長さLaと、挟持部2bの長さLbと、支承部2c,2cの長さLcとを合計し、図3(a)に示した長円形の長手方向の幅WHを、その合計長さ(La+Lb+Lc)とほぼ等しい幅に決め、更に、湾曲部2av,2bvは、ボイド3の球面に線接触するように曲率を設定して円弧状に設計し、腕部2as,2btと2bs,2btはほぼ直線状としてほぼ同じ長さに設計する。And the length La of the clamping part 2a mentioned above, the length Lb of the clamping part 2b, and the length Lc of the support parts 2c and 2c are totaled, and the oval longitudinal direction shown to Fig.3 (a) is shown. The width WH is determined to be approximately equal to the total length (La + Lb + Lc), and the curved portions 2av and 2bv are designed to have an arc shape with a curvature set so as to be in line contact with the spherical surface of the void 3, 2as, 2bt and 2bs, 2bt are designed to be substantially the same length as a substantially straight line.

そして、以上に説明した寸法に設計されて形成された長円形の半製品2’を、曲げ部α,αとβ,βにおいて曲げ加工し、骨組みだけからなる篭形状の保持部材2を形成する。更にその曲げ部α,αとβ,βを、直径が約6mmの中実な棒鋼である2本の支持筋1a,1b上に載せた状態で溶接等を施し、保持部材2と支持筋1a,1bとを一体に固着する。Then, the oval semi-finished product 2 ′ designed and formed to the above-described dimensions is bent at the bending portions α, α and β, β to form a hook-shaped holding member 2 composed of only a skeleton. . Further, welding or the like is performed in a state where the bent portions α, α and β, β are placed on two support bars 1a, 1b which are solid steel bars having a diameter of about 6 mm, and the holding member 2 and the support bar 1a , 1b are fixed together.

更に、支持筋1a,1bに固着した各々の保持部材2に対して、挟持部2a,2bの先端側から球形のボイド3を挿入して押し込み、支持筋1a,1bと挟持部2a,2bとによって画成される三次元空間内にボイド3を嵌め込むことで、図1(a)に示した構造を有するボイドユニットSUを形成する。Further, a spherical void 3 is inserted and pushed into each holding member 2 fixed to the supporting bars 1a and 1b from the front end side of the holding parts 2a and 2b, and the supporting bars 1a and 1b and the holding parts 2a and 2b are inserted. The void unit SU having the structure shown in FIG. 1A is formed by fitting the void 3 in the three-dimensional space defined by the above.

なお、図6に示すように挟持部2a,2bの先端側(下方側)から球形のボイド3を挿入して嵌め込むこととすると、ボイド3の直径Rよりも挟持部2aの湾曲部2avと挟持部2bの湾曲部2bvとの間隔の方が狭いために、ボイド3が湾曲部2avと2bvとの間を通過する際に、可撓性を有する挟持部2a,2bが全体的に若干外側に開くように変形する。その変形した状態でボイド3を更に押し込むと、ボイド3の球面形状に従って挟持部2a,2bが次第に元の形状に戻り、支持筋1a,1bと挟持部2a,2bとによって画成される三次元空間内にボイド3を嵌め込むことができる。そして、三次元空間内にボイド3が嵌め込まれると湾曲部2av,2bvが元の間隔に戻ってボイド3の底側の球面に線接触し、更に腕部2as,2atと2bs,2btがボイド3の横側の球面に接触する。As shown in FIG. 6, when the spherical void 3 is inserted and fitted from the front end side (downward side) of the sandwiching portions 2 a and 2 b, the curved portion 2 av of the sandwiching portion 2 a and the diameter R of the void 3 Since the interval between the bending portion 2b and the curved portion 2bv is narrower, when the void 3 passes between the curved portions 2av and 2bv, the flexible holding portions 2a and 2b are slightly outside as a whole. Deforms to open. When the void 3 is further pushed in the deformed state, the sandwiching portions 2a and 2b gradually return to the original shape according to the spherical shape of the void 3, and the three-dimensional shape defined by the support bars 1a and 1b and the sandwiching portions 2a and 2b. The void 3 can be fitted in the space. When the void 3 is fitted in the three-dimensional space, the curved portions 2av and 2bv return to the original interval and come into line contact with the spherical surface on the bottom side of the void 3, and the arm portions 2as, 2at and 2bs, 2bt are the void 3. In contact with the spherical surface on the side.

そして更に、湾曲部2av,2bvがボイド3の底側の球面に線接触すると、湾曲部2av,2bvの付勢力がその線接触する部分からボイド3の中心Qに向かって付勢され、更に腕部2as,2atと2bs,2btの付勢力がそれらの接触部分からボイド3の中心Qに向かって付勢され、更にボイド3の上方への移動が支承部2c,2cと支持筋1a,1bによって規制される。Further, when the curved portions 2av and 2bv are in line contact with the spherical surface on the bottom side of the void 3, the urging force of the curved portions 2av and 2bv is urged toward the center Q of the void 3 from the line contact portion. The urging forces of the portions 2as, 2at and 2bs, 2bt are urged from the contact portions toward the center Q of the void 3, and further upward movement of the void 3 is performed by the support portions 2c, 2c and the supporting muscles 1a, 1b. Be regulated.

こうして工場等で製造されたボイドユニットSUが工事現場へ搬送され、図4に示したように、型枠工事によって碁盤の目状に配筋された多数の鉄筋Aにて囲まれた多数の隔室内の夫々に、ボイドユニットSUのボイド3を1つずつ配設し、支持筋1a,1bと鉄筋Aとを結束線等にて結束し、コンクリートを打設することによってスラブが形成される。In this way, the void unit SU manufactured in the factory or the like is transported to the construction site, and as shown in FIG. 4, a large number of spaces surrounded by a large number of rebars A arranged in a grid pattern by formwork. A slab is formed by disposing one void 3 of each void unit SU in each room, bundling the supporting bars 1a, 1b and the reinforcing bar A with a binding wire or the like, and placing concrete.

以上に説明した実施例1のボイドユニットSUによると、次のような効果が得られる。According to the void unit SU of the first embodiment described above, the following effects can be obtained.

つまり、上述したように、保持部2内にボイド3が嵌め込まれると、湾曲部2av,2bvがボイド3の底側の球面に線接触し、且つ湾曲部2av,2bvの付勢力がその線接触する部分からボイド3の中心Qに向かって付勢され、更に腕部2as,2atと2bs,2btがボイド3の横側の球面に接触し、且つ腕部2as,2atと2bs,2btの付勢力がそれらの接触部分からボイド3の中心Qに向かって付勢され、更にボイド3の上方への移動が支承部2c,2cと支持筋1a,1bによって規制される。このため、ボイド3を保持部2内に収容するという単なる構造ではなく、湾曲部2av,2bvと腕部2as,2at,2bs,2btと支承部2c,2cと支持筋1a,1bによって、ボイド3の球面を三次元の多方向から付勢することで強固に挟持且つ把持することが可能な強固な構造となっている。そして、工場から工事現場へ搬送する際や、工事現場でボイドユニットSUを鉄筋に結束する際に、保持部材2からスラブ3が脱落する等の問題が発生することが無く、ひいてはコンクリートを打設してもスラブ3の移動を確実に抑制して、品質の良いスラブを形成することができる。That is, as described above, when the void 3 is fitted into the holding portion 2, the curved portions 2av and 2bv are in line contact with the spherical surface on the bottom side of the void 3, and the urging force of the curved portions 2av and 2bv is the line contact. The arm portions 2as, 2at and 2bs, 2bt are in contact with the lateral spherical surface of the void 3, and the arm portions 2as, 2at, 2bs, 2bt are biased. Are urged toward the center Q of the void 3 from the contact portions, and the upward movement of the void 3 is restricted by the support portions 2c and 2c and the supporting bars 1a and 1b. For this reason, the void 3 is not simply a structure in which the void 3 is accommodated in the holding portion 2, and the void 3 is formed by the curved portions 2av, 2bv, the arms 2as, 2at, 2bs, 2bt, the support portions 2c, 2c, and the supporting muscles 1a, 1b. By urging the spherical surface from three-dimensional multi-directions, the structure can be firmly held and gripped. And, when transporting from the factory to the construction site or binding the void unit SU to the reinforcing bar at the construction site, there is no problem of the slab 3 falling off from the holding member 2, and concrete is placed. Even so, it is possible to reliably suppress the movement of the slab 3 and to form a high-quality slab.

更に、本実施例1のボイドユニットSUは、保持部材2の挟持部2a,2b間にボイド3を挿入して嵌め込むだけで、ボイド3を取り付けることができるため、ボイドユニットSUの製造工程を大幅に簡素化することができ、コスト低減を図ることが可能である。更に、ボイドユニットSUの構造が簡素であることからもコスト低減を図ることが可能である。Furthermore, since the void unit SU of the first embodiment can be attached by simply inserting and inserting the void 3 between the holding portions 2a and 2b of the holding member 2, the manufacturing process of the void unit SU can be performed. It can be greatly simplified, and the cost can be reduced. Furthermore, since the structure of the void unit SU is simple, it is possible to reduce the cost.

更に、ボイドユニットSUを工場等で量産(製造)し、その製造したボイドユニットSUを工事現場へ搬送して、スラブを形成するための工事を行うことができる。このため、スラブを形成するための工事を簡素化することが可能である。更に、量産化によって、ボイドユニットSUの製造コストを低減することができるという効果も得られる。
なお、本実施例1においても、図5に示したように、1本の支持筋1に保持部材2を溶接などで固着する構造とし、製造コストを減らすようにしてもよい。
Furthermore, the void unit SU can be mass-produced (manufactured) in a factory or the like, and the manufactured void unit SU can be transported to a construction site to perform construction for forming a slab. For this reason, it is possible to simplify the construction for forming the slab. Furthermore, the effect that the manufacturing cost of void unit SU can be reduced by mass production is also acquired.
Also in the first embodiment, as shown in FIG. 5, a structure in which the holding member 2 is fixed to one support bar 1 by welding or the like may be used to reduce the manufacturing cost.

次に、上述の実施形態と実施例1に対する変形例について、実施例2として説明する。なお、実施例2のボイドユニットSUは、上述の実施形態及び実施例1と基本的に同じ構造を有しているため、構造上の相違点を説明することとする。Next, a modified example of the above embodiment and Example 1 will be described as Example 2. Since the void unit SU of Example 2 has basically the same structure as that of the above-described embodiment and Example 1, differences in structure will be described.

図7は、図6に対応させて示した図である。実施例1のボイドユニットSUでは、図6に示したように、保持部材2の支承部2c,2cとボイド3の間に、支持筋1a,1bが配設された構造を有しているが、この実施例2のボイドユニットSUでは、図7に示すように、保持部材2の支承部2c,2c上に支持筋1a,1bが配設されて溶接等によって固着されている。FIG. 7 is a diagram corresponding to FIG. As shown in FIG. 6, the void unit SU of the first embodiment has a structure in which support bars 1 a and 1 b are disposed between the support portions 2 c and 2 c of the holding member 2 and the void 3. In the void unit SU of the second embodiment, as shown in FIG. 7, support bars 1a and 1b are disposed on the support portions 2c and 2c of the holding member 2 and fixed by welding or the like.

つまり、実施例1のボイドユニットSUでは、量産の際に、保持部材2の支承部2c,2cを支持筋1a,1b上に載せて(懸架させて)溶接等を施し、一体化させるが、実施例2のボイドユニットSUでは、保持部材2の支承部2c,2c上に支持筋1a,1bを載せて溶接等を施し一体化させる。That is, in the void unit SU of the first embodiment, in mass production, the support portions 2c, 2c of the holding member 2 are placed on (supported by) the support bars 1a, 1b, and are welded to be integrated. In the void unit SU of the second embodiment, the support bars 1a and 1b are mounted on the support portions 2c and 2c of the holding member 2 and are integrated by welding or the like.

このように実施例1と実施例2では製造工程が異なるが、実施例2のボイドユニットSUによっても、製造工程の簡素化、コスト低減等を図ることができ、更に機械的強度の大きいボイドユニットを製造することができ、更に実施例1のボイドユニットと同じ効果を得ることができる。This way Example 1 and Example 2 manufacturing process is different, depending on the void unit SU of Example 2, simplification of the manufacturing process, it is possible to reduce the cost and the like, larger voids unit mechanical strength And the same effect as the void unit of the first embodiment can be obtained.

また、図5に示したのと同様に、本実施例2においても、1本の支持筋1を保持部材2の支承部2c,2c上に載せて溶接等を施し一体化させ、コストダウンを図るようにしてもよい。In the same manner as shown in FIG. 5, also in the second embodiment, the single support bar 1 is placed on the support portions 2 c and 2 c of the holding member 2 and integrated by welding or the like, thereby reducing the cost. You may make it show.

なお、以上に説明した実施形態及び実施例1,2は、本願発明を実施する際の最良の形態を示したものであるため、構造上若干変形させたものは本発明に含まれるものである。Since the embodiment and Examples 1 and 2 described above show the best mode for carrying out the invention of the present application, those slightly modified in structure are included in the present invention. .

例えば、曲げ角度θや幅WH,WLを適宜に変更したり、保持部材2の支承部2c,2cのうちの1本を減らしてコストダウンを図ったり、逆に支承部2cを増やして強度を更に増大させたり、保持部材2のうちで支承部2c以外の部分を部分的に切除してコストダウンを図ったり、腕部2as,2at,2bs,2btの形状を若干変更したり、支承部2cの形状を若干変更したり、湾曲部2av,2bvの形状を若干変更したり、支持筋1a,1bを例えばS字形状に湾曲させてその支持筋1a,1bに複数個の支持部材2とボイド3を取り付けて面配列させたボイドユニットを形成したり、ボイド3を、保持部材2に嵌め込んで挟持させることが楕円体の形状にする等の構造のものは、本発明に含まれるものである。For example, the bending angle θ and the widths WH and WL are appropriately changed, one of the support parts 2c and 2c of the holding member 2 is reduced to reduce the cost, and conversely, the support part 2c is increased to increase the strength. Further increases, part of the holding member 2 other than the support 2c is partially cut to reduce costs, the shape of the arms 2as, 2at, 2bs, 2bt is slightly changed, or the support 2c The shape of the curved portions 2av and 2bv is slightly changed, or the support bars 1a and 1b are bent into, for example, an S shape, and a plurality of support members 2 and voids are formed on the support bars 1a and 1b. 3 having a structure in which a void unit is formed by attaching 3 to the surface, or the void 3 is inserted into the holding member 2 and sandwiched between the holding members 2 to have an ellipsoidal shape is included in the present invention. is there.

本発明の実施形態に係るボイドユニットの構造を示す図である。It is a figure which shows the structure of the void unit which concerns on embodiment of this invention. 更に実施形態に係るボイドユニットの構造を示す図である。Furthermore, it is a figure which shows the structure of the void unit which concerns on embodiment. 図1、図2に示すボイドユニットに設けられる保持部材の構造と製造方法を説明するための説明図である。It is explanatory drawing for demonstrating the structure and manufacturing method of a holding member provided in the void unit shown in FIG. 1, FIG. 図1に示すボイドユニットを用いてスラブを形成する際の中空スラブ工法を説明するための説明図である。It is explanatory drawing for demonstrating the hollow slab construction method at the time of forming a slab using the void unit shown in FIG. 実施形態の変形例に係るボイドユニットの構造を示す斜視図である。It is a perspective view which shows the structure of the void unit which concerns on the modification of embodiment. 実施例1のボイドユニットの構造を説明するための図である。FIG. 3 is a diagram for explaining a structure of a void unit according to the first embodiment. 実施例2のボイドユニットの構造を説明するための図である。FIG. 6 is a view for explaining the structure of a void unit of Example 2.

SU…ボイドユニット 1,1a,1b…支持筋 2…保持部材
2c…支承部 2a,2b…挟持部 2as,2at,2bs,2bt…腕部
2av,2bv…湾曲部 3…ボイド
SU ... Void unit 1, 1a, 1b ... Supporting muscle 2 ... Holding member 2c ... Supporting part 2a, 2b ... Holding part 2as, 2at, 2bs, 2bt ... Arm part 2av, 2bv ... Curved part 3 ... Void

Claims (3)

打設されるコンクリート内に埋設してスラブを形成するためのボイドユニットであって、支持筋と、前記支持筋に固着された保持部材と、前記保持部材に嵌め込まれたボイドと、を備え、前記保持部材は、前記支持筋に固着される所定長さの支承部と、前記支承部の両端から所定の角度で曲げ加工されて外側へ傾斜する互いに対向する第1,第2の挟持部とを有し、前記第1,第2の各々の挟持部は、前記支承部から延在し互いに対向する第1,第2の腕部と当該腕部の先端に延在する湾曲部を有し、前記第1,第2の挟持部の間に前記ボイドが挟持されて、前記第1,第2の挟持部の前記支承部から湾曲部の先端までの長さは、前記ボイドが保持部材に嵌め込まれた場合に前記湾曲部がボイドの中心よりも下方側の球面に接触するように設定されて、前記湾曲部は、前記ボイドの球面に接触する円弧状に形成されていること、を特徴とするボイドユニット。A void unit for forming a slab embedded in the concrete to be placed, comprising a support bar, a holding member fixed to the support bar, and a void fitted into the holding member, The holding member includes a support portion having a predetermined length fixed to the support bar, and first and second holding portions facing each other that are bent at a predetermined angle from both ends of the support portion and inclined outward. Each of the first and second clamping portions has first and second arm portions extending from the support portion and facing each other, and a bending portion extending to the tip of the arm portion. The void is sandwiched between the first and second clamping portions, and the length from the support portion to the distal end of the bending portion of the first and second clamping portions is determined so that the void serves as a holding member. When fitted, the curved portion is set to contact the spherical surface below the center of the void. Has been, said curved portion, voids unit, characterized in that, formed in a circular arc shape that contacts the spherical surface of the void. 前記第1,第2の腕部間の幅が、前記ボイドの直径よりも小さく且つボイドの半径よりも大きい範囲内の何れかの所定の幅に設定されていること、
を特徴とする請求項1に記載のボイドユニット。
The width between the first and second arm portions is set to any predetermined width within a range smaller than the diameter of the void and larger than the radius of the void;
The void unit according to claim 1.
前記ボイドは、発泡スチロール等で形成された、略球形又は略楕円球形のボイドであること、を特徴とする請求項1に記載のボイドユニット。2. The void unit according to claim 1, wherein the void is a substantially spherical or substantially elliptical spherical void formed of polystyrene foam or the like .
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