JPH0796838B2 - FRP tension material tension fixing method in prestressed concrete structure - Google Patents
FRP tension material tension fixing method in prestressed concrete structureInfo
- Publication number
- JPH0796838B2 JPH0796838B2 JP14434193A JP14434193A JPH0796838B2 JP H0796838 B2 JPH0796838 B2 JP H0796838B2 JP 14434193 A JP14434193 A JP 14434193A JP 14434193 A JP14434193 A JP 14434193A JP H0796838 B2 JPH0796838 B2 JP H0796838B2
- Authority
- JP
- Japan
- Prior art keywords
- tension
- frp
- sheath
- filler
- 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.)
- Expired - Lifetime
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Description
【0001】[0001]
【産業上の利用分野】本発明はプレストレストコンクリ
ート(以下PCと記す)緊張材として繊維強化プラスチ
ック(以下FRPと記す)を使用したPC構造物におけ
るFRP緊張材の緊張定着方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension fixing method for a FRP tension material in a PC structure using a fiber reinforced plastic (hereinafter referred to as FRP) as a prestressed concrete (hereinafter referred to as PC) tension material.
【0002】[0002]
【従来の技術】従来、耐蝕性の問題を解決する目的か
ら、PC緊張材としてFRP線材を使用するPC構造物
が提案されている。この種のPC構造物におけるFRP
緊張材の端部定着は、従来、図7に示すようにFRP緊
張材1の端部を外周に雄ねじを刻設した円柱状のアンカ
ーヘッド2に挿通し、そのアンカーヘッド2内に楔によ
りFRP緊張材1を定着させ、該アンカーヘッド2をジ
ャッキにより引張して緊張力を付与した後、アンカーヘ
ッド2に螺嵌したナット3を移動させてコンクリート構
造物4の端部の支圧板5に当接させて支持させ、これら
を跡埋コンクリート6をもって埋めるようにしたものが
一般的であった。2. Description of the Related Art Conventionally, a PC structure using an FRP wire as a PC tension material has been proposed for the purpose of solving the problem of corrosion resistance. FRP in this kind of PC structure
To fix the end portion of the tension member, conventionally, as shown in FIG. 7, the end portion of the FRP tension member 1 is inserted into a cylindrical anchor head 2 having an external thread engraved on the outer periphery thereof, and the FRP tension member 1 is wedged into the anchor head 2 to form the FRP. After the tension member 1 is fixed and the anchor head 2 is pulled by a jack to give a tension force, the nut 3 screwed into the anchor head 2 is moved to contact the bearing plate 5 at the end of the concrete structure 4. It was common that they were brought into contact with each other and supported, and these were buried with the buried concrete 6.
【0003】[0003]
【発明が解決しようとする課題】上述した従来のFRP
緊張材の端部定着具は、全て鋼製のものが使用されてい
るところであるが、PC緊張材にFRPからなる耐蝕
性、及び非磁性の材料を使用する場合には、定着具にも
耐蝕性、非磁性のものを使用することが好ましい。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Although all the end fixing devices of the tendons are made of steel, the corrosion resistance of FRP for the PC tendons and the corrosion resistance of the fixing devices when non-magnetic material is used. It is preferable to use a magnetic and non-magnetic material.
【0004】このため、従来の定着具を高マンガン鋼
や、セラミックス等の耐蝕性、非(又は低)磁性材料を
もって成形することも考えられるが、技術的に製造が困
難であることや、高価であることから未だ実用化されて
なく、従って、PC構造物全体の耐蝕性化、非磁性化が
できないという問題があった。For this reason, it is possible to mold the conventional fixing device with a corrosion resistant, non- (or low) magnetic material such as high manganese steel or ceramics, but it is technically difficult to manufacture and expensive. Therefore, there has been a problem that it has not been put to practical use yet, and accordingly, the corrosion resistance and non-magnetization of the entire PC structure cannot be achieved.
【0005】本発明は、上述のような従来の問題にかん
がみ、FRP緊張材を用いたPC構造物の完全な耐蝕性
化、非磁性化を図ることを目的としてなされたものであ
る。In view of the above conventional problems, the present invention has been made for the purpose of attaining complete corrosion resistance and non-magnetization of a PC structure using an FRP tension material.
【0006】[0006]
【課題を達成するための手段】上述の如き従来の問題を
解決し、所期の目的を達成するための本発明の要旨とす
るところは、コンクリート構造物に埋設するシースの少
なくとも緊張側端部に外方端側を拡開させたテーパーシ
ースを設けておき、前記シース内に挿入したFRP緊張
材の端部を前記テーパーシース内を通して突出させ、前
記コンクリート構造物のコンクリート打設と同時もしく
は打設前後の別のタイミングで前記テーパーシース内に
FRPに対して接付着性のある充填材を充填し、該充填
材及び構造物コンクリートの強度発現後前記FRP緊張
材の端部を引張し、緊張力を与えて仮定着させ、該緊張
により前記テーパーシース内より引き出された固化充填
材とテーパーシース内面との空隙に充填材を再充填し、
該再充填した充填材の強度発現を待って前記仮定着を解
くことを特徴としてなるプレストレストコンクリート構
造物におけるFRP緊張材の緊張定着方法に存する。SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems and achieve the intended purpose, the gist of the present invention is to provide at least a tension side end portion of a sheath embedded in a concrete structure. A taper sheath whose outer end side is widened is provided in advance, and an end portion of the FRP tension material inserted into the sheath is projected through the taper sheath to simultaneously or simultaneously with concrete pouring of the concrete structure. At a different timing before and after installation, the taper sheath is filled with a filler having adhesiveness to FRP, and after the strength of the filler and the structure concrete is developed, the end of the FRP tension member is pulled to obtain tension. A force is applied to make it adhere, and the filler is refilled in the gap between the solidified filler pulled out from the inside of the tapered sheath by the tension and the inner surface of the tapered sheath,
The tension fixing method of the FRP tension material in the prestressed concrete structure is characterized in that the assumed adhesion is solved after the strength of the refilled filler material is developed.
【0007】[0007]
【作用】本発明の方法によれば、FRP緊張材を通した
テーパーシース内に充填材を充填し固化させることによ
り、そのテーパーシース内FRP緊張材と一体化したテ
ーパー状のブロックが成形される。このブロックの所望
の強度発現後、FRP緊張材の突出端を引張すると、テ
ーパー状のブロックはFRPの伸びに応じてテーパーシ
ース内より引き出され、該シース内面とブロック間に隙
間ができると同時に緊張がなされる。このようにして形
成された隙間内に充填材を充填し、これが固化すること
によりブロックと先の充填材によるブロックはテーパー
シース内に戻り得なくなり、FRPの仮定着を解くこと
によりFRP緊張材とブロック及び後に充填した充填材
との付着力によってFRP緊張材が定着され、緊張状態
が維持される。According to the method of the present invention, by filling and solidifying the filler in the taper sheath through which the FRP tension material is passed, a tapered block integrated with the FRP tension material in the taper sheath is formed. . When the protruding end of the FRP tension material is pulled after the desired strength of this block is developed, the tapered block is pulled out from the inside of the tapered sheath according to the elongation of the FRP, and a gap is created between the inner surface of the sheath and the block and the tension is increased. Is done. By filling the filler in the gap formed in this way and solidifying it, the block and the block made of the previous filler cannot return to the taper sheath, and by solving the assumed FRP adhesion, The FRP tension material is fixed by the adhesive force between the block and the filling material filled later, and the tension state is maintained.
【0008】[0008]
【実施例】次に本発明の実施例を図1〜図6について説
明する。EXAMPLE An example of the present invention will be described with reference to FIGS.
【0009】図1(イ)〜(ヘ)は本発明方法による工
程を示したものであり、まず、図1(イ)に示すよう
に、型枠11内に緊張材挿通用のシース12を設置す
る。このシース12には一方の緊張材固定端側に拡径シ
ース13を、他方の緊張端側には外方側が拡開したテー
パーシース14を連結させる。これらのシース12,1
3,14にFRP緊張材15を挿通する。1 (A) to 1 (F) show steps of the method of the present invention. First, as shown in FIG. 1 (A), a sheath 12 for inserting a tendon is inserted in a mold 11. Install. A diameter-expanding sheath 13 is connected to this sheath 12 on one tension member fixed end side, and a taper sheath 14 whose outer side is expanded is connected to the other tension end side. These sheaths 12, 1
The FRP tension material 15 is inserted into the parts 3 and 14.
【0010】なお拡径シース13及びテーパーシース1
4にはシース12との境にそれぞれ仕切16,16が設
けられ、拡径シース13には図2に示すように、充填材
注排孔17a,17bが設けられているとともにテーパ
ーシース14には図3に示すように、充填材詰め込み用
の窓18が形成され、蓋19により閉鎖されるようにな
っている。The expanded sheath 13 and the tapered sheath 1
Partitions 16 and 16 are provided on the boundary of the sheath 4 with the sheath 12, respectively. As shown in FIG. 2, the expanding sheath 13 is provided with filler pouring and discharging holes 17a and 17b, and the taper sheath 14 is provided with the same. As shown in FIG. 3, a window 18 for filling the filling material is formed and is closed by a lid 19.
【0011】型枠11内にシース12,13,14を配
置した後、図1(ロ)(ハ)に示すように、その型枠1
1内にコンクリート20を打設する。これと同時にテー
パーシース14内に粘性の高い高強度充填材21を充填
して蓋19により窓18を閉じる。一方、拡径シース1
3内には通常の流動性の高い充填材22を充填する。After arranging the sheaths 12, 13, and 14 in the mold 11, as shown in FIGS.
Concrete 20 is poured into the inside of 1. At the same time, the taper sheath 14 is filled with a high-strength filling material 21 having high viscosity, and the window 18 is closed by the lid 19. On the other hand, the expanded sheath 1
The inside of 3 is filled with a normal filler 22 having high fluidity.
【0012】次いで図1(ニ)に示すように、充填材2
1,22及びコンクリート20が所望の強度に達するの
を待って型枠11を外し、テーパーシース14側のコン
クリート端面に反力受台23をセットし、これにセンタ
ーホールジャッキ24を支持させてFRP緊張材15の
先端を引張して緊張する。Next, as shown in FIG. 1D, the filler 2
After waiting for the strength of the concrete 1, 22 and the concrete 20 to reach the desired strength, the form 11 is removed, and the reaction force receiving base 23 is set on the concrete end face of the taper sheath 14 side, and the center hole jack 24 is supported by this to support the FRP. The tip of the tension member 15 is pulled to make it tense.
【0013】このとき、FRP緊張材15の他端側は拡
径シース13内に充填材22による付着力によって定着
されているため、コンクリート20のプレストレスが導
入される。これと同時にFRP緊張材15には伸びが生
じるが、テーパーシース14内の固化充填材21はFR
P緊張材15に対して強固に固着してるいため、FRP
緊張材15の伸びに伴って、テーパーシース14内から
引き出され、テーパーシース14の内面と固化充填材2
1との間に隙間26が生じる。At this time, since the other end of the FRP tension member 15 is fixed in the expanding sheath 13 by the adhesive force of the filler 22, the prestress of the concrete 20 is introduced. At the same time, the FRP tension material 15 expands, but the solidified filler material 21 in the taper sheath 14 becomes FR.
Since it is firmly fixed to the P-tension material 15, FRP
As the tension member 15 extends, the tension member 15 is pulled out from the inside of the taper sheath 14, and the inner surface of the taper sheath 14 and the solidified filler 2
A gap 26 is formed between the two.
【0014】このようにしてFRPを緊張した後、図1
(ホ)に示すように、反力受台23に対してFRP緊張
材15の端部を仮定着具25を使用して定着させ、ジャ
ッキ24を取り外す。これと並行してテーパーシース1
4の内面と引き出された固化充填材21との間の隙間2
6に通常の流動性の高い充填材22を充填するとともに
シース内にも同じ充填材22を注入する。After the FRP is strained in this way, FIG.
As shown in (e), the end portion of the FRP tension member 15 is fixed to the reaction force receiving base 23 by using the assumed attachment 25, and the jack 24 is removed. In parallel with this, taper sheath 1
2 between the inner surface of 4 and the solidified filler 21 that has been pulled out
6 is filled with normal filler 22 having high fluidity, and the same filler 22 is injected into the sheath.
【0015】然る後、テーパーシース14内の充填材2
2の強度発現を待って仮定着具25を外す。これによっ
てFRP緊張材15の引張力はテーパーシース14内の
固化充填材21,及び22により支持されることとな
る。After that, the filler 2 in the taper sheath 14
After waiting for the strength of 2 to appear, the hypothetical fitting 25 is removed. As a result, the tensile force of the FRP tension member 15 is supported by the solidified fillers 21 and 22 in the taper sheath 14.
【0016】次いで図1(ヘ)に示すように、反力受台
23を取り外し、コンクリート端面から突出しているテ
ーパー状の固化充填材21及びFRP緊張材15のコン
クリート端面からの突出部分21aを切断する。Then, as shown in FIG. 1F, the reaction force receiving base 23 is removed, and the taper-shaped solidified filler 21 and the FRP tension member 15 protruding from the concrete end surface are cut off from the protruding portion 21a from the concrete end surface. To do.
【0017】なお高強度充填材21としては、例えばポ
ルトランドセメントに膨脹材、シリカ及び珪砂を混合さ
せたもの、もしくはポルトランドセメントに膨脹材及び
増粘剤を混合させたものを使用する。The high-strength filler 21 is, for example, a mixture of Portland cement with an expanding material, silica and silica sand, or a mixture of Portland cement with an expanding material and a thickening agent.
【0018】仮定着具25には、一例として図4に示す
ようにアンカーヘッド30、定着楔31、リテーナ3
2,ロックナット33からなり、アンカーヘッド30の
テーパ穴34内にFRP緊張材15を通すとともに、そ
のテーパ穴34内に半割筒状の定着楔31を挿入し、リ
テーナ32をボルト35をもってリテーナ32を楔の圧
入方向に押し込むことによりFRP緊張材15を定着さ
せ、アンカーヘッド30の外周のロックナット33を介
して反力受台23に支持させるものを使用する。As an example, as shown in FIG. 4, the hypothetical fastener 25 includes an anchor head 30, a fixing wedge 31, and a retainer 3.
2, consisting of a lock nut 33, the FRP tension material 15 is passed through the taper hole 34 of the anchor head 30, the fixing wedge 31 of a half-cylindrical shape is inserted into the taper hole 34, and the retainer 32 is retained by the bolt 35. The FRP tension member 15 is fixed by pushing 32 in the press-fitting direction of the wedge, and is supported on the reaction force receiving base 23 via the lock nut 33 on the outer circumference of the anchor head 30.
【0019】上述した実施例では、コンクリート20の
打設と同時にテーパーシース14内への充填材21の充
填を行っているが、この充填材21の充填はコンクリー
ト20の打設前であってもよく、また打設後であっても
よい。更にまた、図5(イ)に示すようにコンクリート
20内に埋め込むテーパーシース14と同じテーパーシ
ース14aを型枠11外にて使用し、これにFRP緊張
材15を通した後、高強度充填材21を充填し、端部ブ
ロック21aを形成し、然る後、図5(ロ)に示すよう
にFRP緊張材15をシース12,13,14内に挿入
し、他端側を拡径シース13内に挿通し、充填材22に
より定着させ、然る後、図1(ニ)以下と同様に緊張定
着させるようにしてもよい。In the above-mentioned embodiment, the filling material 21 is filled into the tapered sheath 14 at the same time when the concrete 20 is poured, but the filling material 21 is filled even before the concrete 20 is poured. Well, it may be after placement. Furthermore, as shown in FIG. 5 (a), the same taper sheath 14a as the taper sheath 14 to be embedded in the concrete 20 is used outside the mold 11, and after passing the FRP tension material 15 through this, a high strength filling material is used. 21 is filled and the end block 21a is formed. After that, as shown in FIG. 5B, the FRP tension material 15 is inserted into the sheaths 12, 13 and 14, and the other end side is expanded diameter sheath 13 It may be inserted into the inside and fixed by the filler 22, and thereafter, the tension may be fixed as in the case of FIG.
【0020】また、上述の実施例では1本のFRP緊張
材15を使用している如く説明したが、実際には多くの
場合、図6に示すように複数本のFRP緊張材15,1
5……を同一部分に使用する。なお図6において前述し
た実施例と同じ部分には同じ符号を付して説明を省略す
る。Further, in the above-mentioned embodiment, it is explained that one FRP tension member 15 is used, but in many cases, in reality, a plurality of FRP tension members 15, 1 are used as shown in FIG.
Use 5 …… for the same part. In FIG. 6, the same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.
【0021】[0021]
【発明の効果】上述した本発明のFRP緊張材の緊張定
着方法は次の如き効果を有する。 (1)緊張材にFRPを使用し、それを本方法により定
着することによって、完全な耐蝕性・非磁性PC構造物
を構築することが可能となる。 (2)高マンガン鋼、セラミックス等の耐蝕性、非
(低)磁性材料による高価な定着具を使用する場合比べ
て極めて経済的になる。 (3)緊張材を付着させるためのグラウトはコンクリー
ト打設前にも行うこともできるので、充填しやすい方法
で直接確認しながら信頼度の高い充填ができる。このた
め、確実な付着定着が可能となる。 (4)グラウトの充填が容易であるから、必ずしも流動
性の良いグラウトを必要としない。このためより付着強
度の大きい材料、例えば固練りの各種グラウトやモルタ
ルを使用することが出来る。 (5)付着強度が大きい充填材を使用することにより、
テーパーシースの長さを短くすることが出来る。この短
縮化により、充填がより確実になると同時に施工も容易
となる。 (6)緊張後にテーパーシース内に生じる隙間のグラウ
トは、主として定着力による支圧応力に耐えられれば良
いので、充填材は短時間の養生で済み、PC部材は直ち
に使用することが出来る。EFFECTS OF THE INVENTION The tension fixing method for FRP tension material of the present invention described above has the following effects. (1) By using FRP as the tension material and fixing it by this method, it becomes possible to construct a completely corrosion-resistant and non-magnetic PC structure. (2) Corrosion resistance such as high manganese steel and ceramics, which is extremely economical compared with the case of using an expensive fixing tool made of a non- (low) magnetic material. (3) Since the grout for attaching the tension material can be performed before the concrete is poured, the filling can be performed with high reliability while directly confirming it by a method easy to fill. Therefore, it is possible to reliably attach and fix. (4) Since it is easy to fill grout, it is not always necessary to use grout having good fluidity. Therefore, it is possible to use a material having a higher adhesion strength, for example, various types of grout or mortar which are hardened. (5) By using a filler with high adhesion strength,
The length of the tapered sheath can be shortened. Due to this shortening, the filling becomes more reliable and at the same time the construction becomes easier. (6) Since the grout of the gap generated in the tapered sheath after the tension is able to withstand the bearing stress mainly due to the fixing force, the filler can be cured for a short time, and the PC member can be used immediately.
【図1】(イ)〜(ヘ)は本発明方法の一実施例の各工
程の概略を示す断面図である。1 (a) to 1 (f) are cross-sectional views schematically showing each step of one embodiment of the method of the present invention.
【図2】同じく拡径シースの斜視図である。FIG. 2 is a perspective view of the expanding sheath.
【図3】同上の実施例に使用しているテーパーシースの
斜視図である。FIG. 3 is a perspective view of a tapered sheath used in the above-mentioned embodiment.
【図4】同じく仮定着具の断面図である。FIG. 4 is a sectional view of the hypothetical garment.
【図5】本発明方法により製造されるPC構造物の更に
具体的な例を示す断面図である。FIG. 5 is a cross-sectional view showing a more specific example of a PC structure manufactured by the method of the present invention.
【図6】(イ)〜(ロ)は本発明方法の他の実施例の工
程を示す断面図である。6A to 6B are cross-sectional views showing steps of another embodiment of the method of the present invention.
【図7】従来例を示す断面図である。FIG. 7 is a cross-sectional view showing a conventional example.
11 型枠 12 シース 13 拡径シース 14 テーパーシース 15 FRP緊張材 16 仕切 17,17b 充填材注排孔 18 窓 19 蓋 20 コンクリート 21,22 充填材 23 反力受台 24 センターホールジャッキ 25 仮定着具 26 隙間 30 アンカーヘッド 31 定着楔 32 リテーナ 33 ロックナット 34 テーパ穴 35 ボルト 11 Formwork 12 Sheath 13 Expanding sheath 14 Tapered sheath 15 FRP tension material 16 Partition 17, 17b Filling material pouring hole 18 Window 19 Cover 20 Concrete 21, 22 Filling material 23 Reaction force receiving stand 24 Center hole jack 25 Assumption fitting 26 Gap 30 Anchor Head 31 Fixing Wedge 32 Retainer 33 Lock Nut 34 Tapered Hole 35 Bolt
Claims (1)
少なくとも緊張側端部に外方端側を拡開させたテーパー
シースを設けておき、前記シース内に挿入したFRP緊
張材の端部を前記テーパーシース内を通して突出させ、
前記コンクリート構造物のコンクリート打設と同時もし
くは打設前後の別のタイミングで前記テーパーシース内
にFRPに対して接付着性のある充填材を充填し、該充
填材及び構造物コンクリートの強度発現後前記FRP緊
張材の端部を引張し、緊張力を与えて仮定着させ、該緊
張により前記テーパーシース内より引き出された固化充
填材とテーパーシース内面との空隙に充填材を再充填
し、該再充填した充填材の強度発現を待って前記仮定着
を解くことを特徴としてなるプレストレストコンクリー
ト構造物におけるFRP緊張材の緊張定着方法。1. A taper sheath whose outer end side is widened is provided at least on the tension side end of a sheath embedded in a concrete structure, and the end of the FRP tension material inserted into the sheath is tapered. Project through the sheath,
After the filler having adhesiveness to FRP is filled in the taper sheath at the same time as the concrete pouring of the concrete structure or at another timing before and after pouring, the strength of the filler and the structural concrete is developed. The end portion of the FRP tension material is pulled, and a tension force is applied to make it adhere, and the tension refills the filler between the solidified filler material pulled out from the inside of the taper sheath and the inner surface of the taper sheath. A tension fixing method for an FRP tension material in a prestressed concrete structure, which is characterized in that the hypothetical adhesion is released after the strength of the refilled filler material is developed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14434193A JPH0796838B2 (en) | 1993-05-25 | 1993-05-25 | FRP tension material tension fixing method in prestressed concrete structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14434193A JPH0796838B2 (en) | 1993-05-25 | 1993-05-25 | FRP tension material tension fixing method in prestressed concrete structure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06330631A JPH06330631A (en) | 1994-11-29 |
JPH0796838B2 true JPH0796838B2 (en) | 1995-10-18 |
Family
ID=15359857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14434193A Expired - Lifetime JPH0796838B2 (en) | 1993-05-25 | 1993-05-25 | FRP tension material tension fixing method in prestressed concrete structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0796838B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013163969A (en) * | 2013-04-22 | 2013-08-22 | Taisei Corp | Pre-stressed concrete member |
JP2024047157A (en) * | 2022-09-26 | 2024-04-05 | オリエンタル白石株式会社 | Tensioning force introduction method and manufacturing method for prestressed concrete structure |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6126455B2 (en) * | 2013-05-14 | 2017-05-10 | 大成建設株式会社 | Method for producing prestressed concrete member and concrete member |
-
1993
- 1993-05-25 JP JP14434193A patent/JPH0796838B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013163969A (en) * | 2013-04-22 | 2013-08-22 | Taisei Corp | Pre-stressed concrete member |
JP2024047157A (en) * | 2022-09-26 | 2024-04-05 | オリエンタル白石株式会社 | Tensioning force introduction method and manufacturing method for prestressed concrete structure |
Also Published As
Publication number | Publication date |
---|---|
JPH06330631A (en) | 1994-11-29 |
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