JPH01316215A - Manufacture of precast concrete member - Google Patents
Manufacture of precast concrete memberInfo
- Publication number
- JPH01316215A JPH01316215A JP14683788A JP14683788A JPH01316215A JP H01316215 A JPH01316215 A JP H01316215A JP 14683788 A JP14683788 A JP 14683788A JP 14683788 A JP14683788 A JP 14683788A JP H01316215 A JPH01316215 A JP H01316215A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- pulled out
- rod
- shaped body
- precast concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011178 precast concrete Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 57
- 239000013013 elastic material Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 4
- 238000009415 formwork Methods 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 230000003014 reinforcing effect Effects 0.000 abstract description 6
- 238000009750 centrifugal casting Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000000465 moulding Methods 0.000 description 8
- 230000002787 reinforcement Effects 0.000 description 6
- 239000011440 grout Substances 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は建設用柱、梁等のプレキャストコンクリ−！・
部材の製造方法に係るものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention is directed to precast concrete for construction columns, beams, etc.・
This relates to a method of manufacturing a member.
（従来の技術）
建造物のプレキャストコンクリート柱の上下階社主筋の
接合をシース筋方式によって行なう場合、プレキャスト
コンクリート梁、壁の主筋用シース部を形成する場合、
或いはプレキャストコンクリート梁のプレストレススト
ランドまたは鋼棒用等のシース部を形成する場合、従来
は薄肉鋼製シース管を所定位置に打込むことによって、
シース部の成形を行なっていた。(Prior art) When connecting the main reinforcements of the upper and lower floors of precast concrete columns of a building using the sheath reinforcement method, when forming the sheath parts for the main reinforcements of precast concrete beams and walls,
Alternatively, when forming a sheath part for a prestressed strand of a precast concrete beam or a steel bar, conventionally, by driving a thin-walled steel sheath pipe into a predetermined position,
The sheath part was being molded.
（発明が解決しようとする課題）
この場合、シース管が薄肉鋼製パイプであるため、プレ
キャストコンクリート部材製作時のコンクリート打設圧
によって、所定の位置からずれたリ、撓んだり、或いは
折れ曲ったすすることが多く、支障を招来することが多
かった。(Problem to be Solved by the Invention) In this case, since the sheath pipe is a thin-walled steel pipe, it may deviate from a predetermined position, bend, or bend due to the concrete placement pressure during the production of the precast concrete member. There was a lot of work to be done, which often led to problems.
また、シース筋挿入後、グラウトモルタルを注入するが
、シース部のグラウトモルタルと部材コンクリートとの
境界は薄肉鋼製シース管によって絶縁されているため、
シース内のグラウト材と部材の本体コンクリートとの一
体性が不十分で、構造耐力上問題が多かった。In addition, after inserting the sheath reinforcement, grout mortar is injected, but since the boundary between the grout mortar in the sheath part and the component concrete is insulated by a thin-walled steel sheath pipe,
The grout in the sheath and the concrete of the main body of the member were not fully integrated, causing many problems in terms of structural strength.
本発明はこのような従来技術の有する問題点に迄みて提
案されたもので、その目的とする処は、主筋、またはプ
レスルレスストランド若しくは鋼棒の配設用空洞部が部
材の所定位置に精確に成形され、且つ同空洞部に注入さ
れるグラウト材と部材コンクリートとの一体性が格段に
向上される構造耐力」−有利なプレキャストコンクリー
ト部材の製造方法を提供する点にある。The present invention has been proposed in view of the problems of the prior art, and its purpose is to ensure that the main reinforcing bars, presleless strands, or steel bars are placed in a predetermined position in the member. It is an object of the present invention to provide an advantageous method for producing precast concrete parts that is precisely formed and has structural strength that significantly improves the integrity of the grout material injected into the cavity and the concrete part.
（課題を解決するための手段）
前記の目的を達成するため、本発明に係るプレキャスト
コンクリート部材の製造方法は、プレキャストコンクリ
ート部材製造用型枠内における補強鋼材の配設位置に、
外周面に弾性材を螺旋状に巻き付けた棒状体をセットし
て前記型枠内にコンクリートを打設し、同打設コンクリ
ートが未だ固化しない状態において、前記棒状体を引抜
き、次いで前記弾性材を引抜くように構成されている。(Means for Solving the Problems) In order to achieve the above-mentioned object, the method for manufacturing a precast concrete member according to the present invention includes the following steps:
A rod-shaped body with an elastic material spirally wound around its outer circumferential surface is set, concrete is poured into the formwork, and while the poured concrete has not yet solidified, the rod-shaped body is pulled out, and then the elastic material is It is configured to be pulled out.
なお前記の方法を遠心成形によって行なう場合は、型枠
にコンクリートを充填して遠心成形した直後、順次前記
棒状体及び弾性材を引抜くものである。When the above-mentioned method is carried out by centrifugal molding, immediately after filling the mold with concrete and centrifugally molding, the rod-shaped body and the elastic material are sequentially pulled out.
また遠心成形によらず、型枠内にコンクリートを打設す
るのみで前記の方法を行なう場合、打設コンクリートの
圧縮強度が５．０ ｋｇ／ｃａ程度以上になったとき、
順次前記棒状体及び弾性材を引抜くものである。In addition, when performing the above method by simply pouring concrete into formwork without using centrifugal forming, when the compressive strength of the poured concrete reaches approximately 5.0 kg/ca or more,
The rod-shaped body and the elastic material are sequentially pulled out.
（作用）
本発明においては前記したように、プレキャストコンク
リート部材製造用型枠内における補強鋼材の配置位置に
、同補強鋼材を挿通するためのシース部成形用型枠とし
ての、外周面に弾性材を螺旋状に巻き付けた棒状体をセ
ットして、前記プレキャストコンクリート部材製造用型
枠にコンクリートを打設し、同打設コンクリートの未固
化状態のとき前記棒状体を引抜く。(Function) As described above, in the present invention, an elastic material is provided on the outer peripheral surface of the formwork for forming the sheath part for inserting the reinforcing steel material at the position where the reinforcing steel material is placed in the formwork for manufacturing precast concrete members. A rod-shaped body made of spirally wound concrete is set, concrete is poured into the formwork for manufacturing the precast concrete member, and the rod-shaped body is pulled out when the poured concrete is in an unsolidified state.
このとき同棒状体に巻き付けられている弾性材は周辺の
打設コンクリートに固化されているため、前記棒状体に
引張られて同棒状体と共に抜は出すことがなく、同棒状
体が引抜かれた直後、前記弾性材は棒状体に巻き付ける
際に張力がかかっているため、同弾性材はその弾性によ
って収縮して打設コンクリートから外れ、容易に引抜か
れる。At this time, since the elastic material wrapped around the rod-shaped body was hardened by the surrounding concrete, it was not pulled out together with the rod-shaped body by being pulled by the rod-shaped body, and the rod-shaped body was pulled out. Immediately afterwards, since the elastic material is under tension when it is wound around the rod-shaped body, the elastic material contracts due to its elasticity, detaches from the poured concrete, and is easily pulled out.
この結果、シース部内側表面に連続した螺旋状をなす、
前記弾性材の断面形状の溝を有する所要のシース部が成
形される。As a result, a continuous spiral is formed on the inner surface of the sheath part.
A required sheath portion having a groove in the cross-sectional shape of the elastic material is molded.
前記の方法を遠心成形法によって行なう場合、打設コン
クリートが遠心力によって圧密されるため、前記棒状体
の引抜きを遠心成形の直後行っても、シース部の空洞が
十分に保形される。When the above method is carried out by centrifugal forming, the poured concrete is consolidated by centrifugal force, so even if the rod-shaped body is pulled out immediately after centrifugal forming, the shape of the cavity of the sheath portion is sufficiently maintained.
またこの時期は打設コンクリートと前記棒状体との付着
力も低く、同棒状体が容易に引抜かれる。Also, at this time, the adhesion force between the cast concrete and the rod-shaped body is low, and the rod-shaped body is easily pulled out.
遠心成形を行なうことな（、型枠内にコンクリートを打
設するのみで前記の方法を行なう場合、打設コンクリー
トの圧縮強度が５ ｋｇ ／ ｃ艷程度以上になったと
き、順次前記棒状体及びこれに巻きつけられた弾性体を
引抜くことによって、プレキャストコンクリート部材中
に前記シース部の空洞が成形される。Do not perform centrifugal forming (in the case where the above method is carried out by simply pouring concrete into the formwork, when the compressive strength of the poured concrete reaches approximately 5 kg/cm or more, the above-mentioned rod-shaped bodies and By pulling out the elastic body wound around this, the cavity of the sheath part is formed in the precast concrete member.
（実施例） 以下本発明を図示の実施例について説明する。(Example) The present invention will be described below with reference to the illustrated embodiments.
第１図及び第２図に示すように、プレキャストコンクリ
ート柱部材製造用型枠（１）における柱主筋挿通用シー
ス部に、鋼管や鋼棒等の、コンクリート打設圧により撓
曲したり折れ曲らないような十分の強度を有する棒状体
（２）に、ゴム製のロープ（３）、合成繊維製ローブの
如き弾性材（３）を張力をかけた状態で螺旋状に巻き付
けたものをセットする。As shown in Figures 1 and 2, steel pipes, steel bars, etc. are bent or bent due to the concrete placement pressure in the sheath part for inserting the column main reinforcement in the formwork (1) for manufacturing precast concrete column members. An elastic material (3) such as a rubber rope (3) or a synthetic fiber robe is wound spirally under tension around a rod-shaped body (2) that has sufficient strength to prevent do.
このとき、前記棒状体（２）の位置がずれないように、
端部が前記型枠に固定される。At this time, so that the position of the rod-shaped body (2) does not shift,
The ends are fixed to the formwork.
次いでフープ筋（４）等、必要な鉄筋の配筋を行なった
のち、コンクリート（５）を充填し、遠心成形を行なっ
た直後、前記棒状体（２）を引き抜く。このとき同棒状
体（２）に巻き付けられているゴム製ロープは、遠心成
形によって圧密されたコンクリート（５）に固定されて
いるため、棒状体（２）とともに引張られて抜は出すこ
とがなく、同棒状体（２）が抜けた直後、ゴム製のロー
ブ（３）には張力がかかっているため、弾性によって収
縮して周辺のコンクリートより外れ、同ロープ（３）は
容易に引き抜かれる。Next, necessary reinforcing bars such as hoop bars (4) are arranged, and then concrete (5) is filled, and immediately after centrifugal forming, the rod-shaped body (2) is pulled out. At this time, the rubber rope wrapped around the rod-shaped body (2) is fixed to the concrete (5) that has been consolidated by centrifugal molding, so it is pulled together with the rod-shaped body (2) and does not come out. Immediately after the rod-shaped body (2) is pulled out, the rubber lobe (3) is under tension, so it contracts due to its elasticity and comes off from the surrounding concrete, and the rope (3) is easily pulled out.
この結果、プレキャストコンクリート柱部材の所定位置
に、内周面にロープ（３）の断面形状を有する連続した
螺旋状の溝が形成されたシース部を容易に成形すること
ができる。As a result, it is possible to easily form a sheath portion in which a continuous spiral groove having the cross-sectional shape of the rope (3) is formed on the inner peripheral surface at a predetermined position of the precast concrete column member.
なお遠心成形の場合は、打設コンクリート（５）に遠心
力が加わり圧密されているため、シース部成形用の棒状
体（２）の引抜作業を遠心成形の直後に行なっても、シ
ース部の空洞を保形することができる。またこの時期に
前記棒状体（２）を引き抜く場合は、打設コンクリート
（５）と同棒状体（２）との付着力が低く、同棒状体（
２）の引き抜きが容易に行なわれる。In the case of centrifugal forming, centrifugal force is applied to the poured concrete (5) and it is consolidated, so even if the rod-shaped body (2) for forming the sheath part is pulled out immediately after centrifugal forming, the sheath part will not be formed. Can preserve the shape of cavities. In addition, when pulling out the rod-shaped body (2) at this time, the adhesion force between the poured concrete (5) and the rod-shaped body (2) is low, and the rod-shaped body (2)
2) is easily pulled out.
また遠心成形によらず、前記型枠内にコンクリートを打
設する場合には、打設コンクリートの圧縮強度が５ｋｇ
／ｃＪ以上になったとき、前記棒状体（２）及びゴム製
のローブ（３）を順次引抜くことによって、プレキャス
トコンクリート柱部材内に中空シース部を成形するもの
である。In addition, when concrete is poured into the formwork without using centrifugal forming, the compressive strength of the poured concrete is 5 kg.
/cJ or more, the rod-shaped body (2) and the rubber lobe (3) are sequentially pulled out to form a hollow sheath part within the precast concrete column member.
なお前記実施例においては、棒状体（２）に弾性材とし
てゴム製のロープ（３）が巻き付けられているが、第３
図に示すように、ゴム製チューブ、合成樹脂製チューブ
５鋼製チユーブの如きチューブを螺旋状に切ったスパイ
ラル状のチューブ（−ｊ）を棒状体（２）に巻き付けて
もよい。In the above embodiment, a rubber rope (3) is wound around the rod-shaped body (2) as an elastic material.
As shown in the figure, a spiral tube (-j) obtained by cutting a tube made of rubber, a synthetic resin tube, a steel tube, etc. into a spiral shape may be wound around the rod-shaped body (2).
なお前記実施例はプレキャストコンクリート柱部材の主
筋用シース部の成形に本発明の方法を適用した場合を示
したものであるが、本発明はこの他、プレキャストコン
クリート梁部材のプレストレスストランド、または鋼棒
用シース部、梁主筋用シース部の成形、プレキャス［・
コンクリート壁の壁土適用シース部の成形に適用される
。Although the above-mentioned example shows the case where the method of the present invention is applied to forming the main reinforcing sheath part of a precast concrete column member, the present invention also applies to prestress strands of a precast concrete beam member or steel Molding of bar sheath parts and beam main reinforcement sheath parts, precasting [・
Applicable for forming the wall soil application sheath part of concrete walls.
（発明の効果）
本発明によれば前記したように、プレキャストコンクリ
ート部材製造用型枠における補強材の配設位置に、従来
のように薄肉鋼管製シース管をセットすることなく、外
周面に弾性材を螺旋状に巻き付けた棒状体をセットして
コンクリートを打設し、同打設コンクリートが未固化状
態のうちに、前記棒状体、続いて前記弾性材を引抜くこ
とによって、内周面に弾性材の断面形状を有する連続し
た螺旋状の溝を有するシース部を成形するようにしたの
で、前記棒状体を十分な強度を有する部材より構成する
ことができ、コンクリート打設圧や、セット時に受ける
外圧等によって撓曲したり、折れ曲ったすすることがな
い。(Effects of the Invention) According to the present invention, as described above, there is no need to set a sheath pipe made of thin-walled steel pipe at the location of the reinforcing material in the formwork for manufacturing precast concrete members, as in the conventional method, and the outer circumferential surface has elasticity. Concrete is poured by setting a rod-shaped body made of spirally wrapped material, and while the poured concrete is still unhardened, the rod-shaped body and then the elastic material are pulled out to form a concrete on the inner peripheral surface. Since the sheath part having a continuous spiral groove having a cross-sectional shape of an elastic material is molded, the rod-shaped body can be made of a member having sufficient strength, and it is possible to reduce the concrete placement pressure and the setting time. It will not bend or bend due to external pressure, etc.
またプレキャストコンクリート部材中に成形されるシー
ス部内周面に形成される螺旋状の溝の断面形状を、従来
のシース管の場合に比して大きな断面とすることができ
、更に前記棒状体に対する弾性材の巻き付はピッチを調
整することによって、前記シース部の螺旋状の溝のピッ
チを細かくしたり、粗くしたり、自由に設計でき、従っ
て従来のシース管方式に比してプレキャストコンクリー
ト部材のコンクリートとグラウト材との一体性が格段に
向トし、構造耐力上有利である。In addition, the cross-sectional shape of the spiral groove formed on the inner peripheral surface of the sheath part formed in the precast concrete member can be made larger than that of a conventional sheath pipe, and furthermore, By adjusting the pitch of the material wrapping, the pitch of the spiral grooves in the sheath section can be made finer or coarser, and can be freely designed. The integrity of the concrete and grout material is greatly improved, which is advantageous in terms of structural strength.
更にまた本発明によれば、前記棒状体に巻き付けられて
いる弾性体は、同棒状体を引抜くとき周囲のコンクリー
トに固定されているため、棒状体と一緒に引張られて引
き抜けてくることはなく、前記棒状体が抜けた直後、弾
性体は同棒状体に巻き付ける際に張力がかかっているた
め自づと収縮してコンクリート面より外れ、容易にシー
ス成形部より引出すことができ、連続した螺旋溝を存す
るシース部をプレキャストコンクリート部材の本体コン
クリートによって成形できる。Furthermore, according to the present invention, the elastic body wrapped around the rod-shaped body is fixed to the surrounding concrete when the rod-shaped body is pulled out, so that the elastic body is pulled out together with the rod-shaped body. Immediately after the rod-shaped body is pulled out, the elastic body is under tension when wrapped around the rod-shaped body, so it automatically contracts and comes off from the concrete surface, and can be easily pulled out from the sheath molding part, making it continuous. The sheath portion having the spiral groove can be formed by the concrete main body of the precast concrete member.
請求項２の発明は、前記の方法を遠心成形によって行な
う場合、前記棒状体に巻き付けられた弾性体は遠心成形
によって圧密されたコンクリートに固定され、棒状体と
共に引張られて抜けることはなく、また型枠内コンクリ
ートが遠心力によって圧密され、前記棒状体を引き抜い
てもシース部空洞を十分に保形できるので、前記棒状体
の引抜き、及びこれに続く弾性体の引抜きを遠心成形の
直後に行なうようにしたもので、しかもこの時期、打設
コンクリートと棒状体との付着力も低く同棒状体の引抜
きが容易に行なわれることと相俟って、製造能率を向上
しうるちのである。The invention according to claim 2 provides that when the above method is carried out by centrifugal molding, the elastic body wound around the rod-shaped body is fixed to the concrete consolidated by centrifugal molding, and is not pulled out together with the rod-shaped body; Since the concrete in the form is compacted by centrifugal force and the sheath cavity can be kept in sufficient shape even if the rod-shaped body is pulled out, the rod-shaped body and the subsequent elastic body are pulled out immediately after centrifugal forming. This, combined with the fact that the adhesion between the cast concrete and the rods was low during this period, making it easy to pull out the rods, helped improve production efficiency.
請求項３の発明は前記の方法を遠心成形によらず、型枠
内にコンクリートを打設するのみで行なう場合、打設コ
ンクリ−１・の圧縮強度が５．０ｋｇ／ｃｌｌ程度以ト
になったとき、前記棒状体及び弾性体を順次打設コンク
リートより引き抜き、製造能率を向上しうるものである
。The invention of claim 3 provides that when the above method is carried out by simply pouring concrete into a formwork without using centrifugal molding, the compressive strength of the poured concrete 1 is about 5.0 kg/cll or less. At this time, the rod-shaped body and the elastic body can be sequentially pulled out of the poured concrete, thereby improving manufacturing efficiency.
第１図は本発明に係るプレキャストコンクリート部材の
製造方法の一実施例の実施状況を示す横断平面図、第２
図及び第３Ｉ２Ｉは夫々弾性材が螺旋状に巻き付けられ
た棒状体の平面図である。
（Ｉ）−プレキャストコンクリート柱部材製造用型枠
（２）−・−棒状体 （３）＝−ロープ（ゴ）−チ
ューブ （５）−・−コンクリート代理人
弁理士 岡 本 重 文
外２名
る
躬２閃FIG. 1 is a cross-sectional plan view showing the implementation status of one embodiment of the method for manufacturing precast concrete members according to the present invention, and FIG.
Figures 3 and 3I2I are plan views of a rod-shaped body around which an elastic material is spirally wound. (I) - Formwork for manufacturing precast concrete column members
(2)--rod-shaped body (3)=-rope (go)-tube (5)--concrete agent
Patent attorney Shigeru Okamoto 2 people outside of Bungai 2 stories
Claims (3)
ける補強鋼材の配設位置に、外周面に弾性材を螺旋状に
巻き付けた棒状体をセットして前記型枠内にコンクリー
トを打設し、同打設コンクリートが未だ固化しない状態
において、前記棒状体を引抜き、次いで前記弾性材を引
抜くことを特徴とするプレキャストコンクリート部材の
製造方法。(1) A rod-shaped body with an elastic material spirally wound around its outer circumferential surface is set at the position where the reinforcing steel material is to be placed in a formwork for manufacturing precast concrete members, and concrete is poured into the formwork. A method for manufacturing a precast concrete member, characterized in that the rod-shaped body is pulled out and then the elastic material is pulled out while the concrete is not yet hardened.
トを充填して遠心成形した直後、前記棒状体を引抜き、
次いで前記弾性材を引抜く請求項（１）記載のプレキャ
ストコンクリート部材の製造方法。(2) When centrifugally forming the member, immediately after filling the formwork with concrete and centrifugally forming, the rod-shaped body is pulled out,
The method for manufacturing a precast concrete member according to claim 1, wherein the elastic material is then pulled out.
するのみで前記部材を成形する場合、打設コンクリート
の圧縮強度が５．０ｋｇ／ｃｍ＾２程度以上になったと
き、前記棒状体を引抜き、次いで前記弾性材を引抜く請
求項（１）記載のプレキャストコンクリート部材の製造
方法。(3) When forming the above-mentioned member by simply placing concrete in a formwork without using centrifugal forming, when the compressive strength of the poured concrete is approximately 5.0 kg/cm^2 or more, the rod-shaped The method for manufacturing a precast concrete member according to claim 1, wherein the body is pulled out and then the elastic material is pulled out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14683788A JPH01316215A (en) | 1988-06-16 | 1988-06-16 | Manufacture of precast concrete member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14683788A JPH01316215A (en) | 1988-06-16 | 1988-06-16 | Manufacture of precast concrete member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01316215A true JPH01316215A (en) | 1989-12-21 |
| JPH0416049B2 JPH0416049B2 (en) | 1992-03-19 |
Family
ID=15416649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14683788A Granted JPH01316215A (en) | 1988-06-16 | 1988-06-16 | Manufacture of precast concrete member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01316215A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011174258A (en) * | 2010-02-23 | 2011-09-08 | Ohbayashi Corp | Method of manufacturing concrete member and hole forming member |
-
1988
- 1988-06-16 JP JP14683788A patent/JPH01316215A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011174258A (en) * | 2010-02-23 | 2011-09-08 | Ohbayashi Corp | Method of manufacturing concrete member and hole forming member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0416049B2 (en) | 1992-03-19 |
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