JP3281351B2 - Prestressing method for concrete disk-shaped structure - Google Patents
Prestressing method for concrete disk-shaped structureInfo
- Publication number
- JP3281351B2 JP3281351B2 JP2000010310A JP2000010310A JP3281351B2 JP 3281351 B2 JP3281351 B2 JP 3281351B2 JP 2000010310 A JP2000010310 A JP 2000010310A JP 2000010310 A JP2000010310 A JP 2000010310A JP 3281351 B2 JP3281351 B2 JP 3281351B2
- Authority
- JP
- Japan
- Prior art keywords
- shaped structure
- tendon
- concrete
- disk
- strand
- 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
Links
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- Reinforcement Elements For Buildings (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はコンクリート円盤状
構造物のプレストレス導入方法に関し、更に詳しくはタ
ンクなどの円筒形容器構造物の底盤や、スケート場、ヘ
リポートなどのコンクリート版、又は容器構造物の湾曲
（膨らみ）を有する蓋盤（頂盤）、円形構造物のドーム
形屋根版などのコンクリート円盤状構造物のプレストレ
ス導入方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for introducing prestress into a concrete disk-shaped structure, and more particularly to a bottom plate of a cylindrical container structure such as a tank, a concrete plate such as a skating rink, a heliport, or a container structure. The present invention relates to a method for introducing prestress into a concrete disk-shaped structure such as a lid (top) having a curved shape (bulge) and a dome-shaped roof slab of a circular structure.
【０００２】[0002]
【従来の技術】流体を貯蔵するＰＣタンクなどの円筒形
容器構造物の底盤や蓋盤（頂盤）や、スケート場・遊技
運動場、ヘリポートやドーム形屋根版など円盤状のコン
クリート版にプレストレスを導入したプレストレストコ
ンクリート構造物がある。この場合、図１０に一例を示
すように、従来は直線状や円弧状に多本数のＰＣ緊張材
４１を円盤４０内に配設し、緊張材両端で緊張し円盤外
周縁位置の多数の定着部６で定着するのが一般的であっ
た。周縁を固定又は支持した円盤状構造物に面圧が作用
したとき、引張主応力が同心円方向に生じ、放射状のひ
び割れが発生し易い。また、コンクリート円盤状構造物
がＰＣ緊張材の両端で緊張することができない構造の場
合は、ＰＣ緊張材の一端をコンクリート版中にデッドア
ンカーとして埋設固定し、他端を円盤外周位置に定着す
る技術が採用されてきた。これらは何れの場合も多量の
ＰＣ緊張材と高価な定着具を多数個必要とし、更に定着
部分の応力集中に対抗する補強や定着部の跡埋めなど、
煩雑な作業が多く建設費高騰の要因となり問題となって
いた。2. Description of the Related Art Prestressing is applied to the bottom plate and lid plate (top plate) of cylindrical container structures such as PC tanks for storing fluid, disc-shaped concrete plates such as skating rinks, playgrounds, helipads and dome-shaped roof plates. There is a prestressed concrete structure that introduces a. In this case, as shown in an example in FIG. 10, conventionally, a large number of PC tendons 41 are arranged in a disk 40 in a straight line or an arc shape, and are tensioned at both ends of the tendon, and a large number of fixings of the outer peripheral edge position of the disc are made. In general, fixing was performed in the section 6. When a surface pressure acts on a disk-shaped structure having a fixed or supported peripheral edge, a tensile main stress is generated in a concentric direction, and radial cracks are easily generated. If the concrete disk-shaped structure cannot be tensioned at both ends of the PC tendon, one end of the PC tendon is embedded and fixed as a dead anchor in the concrete slab, and the other end is fixed at the outer periphery of the disc. Technology has been adopted. In each case, a large amount of PC tendon and a large number of expensive fixing devices are required, and furthermore, reinforcement against the concentration of stress at the fixing portion, filling of the fixing portion, etc.
A lot of cumbersome work was the cause of high construction costs, which was a problem.
【０００３】[0003]
【発明が解決しようとする課題】本発明はコンクリート
円盤状構造物に、同心円状に生じる主応力に最も効果的
に対抗し、可及的に少量の緊張材を用い、高価な定着具
の使用を最少個数に留めて確実に緊張力を導入し定着す
ることができ、さらに、多数の定着部の部分的補強など
を必要としない、低コストのプレストレス導入技術を提
供することを目的とする。SUMMARY OF THE INVENTION The present invention is directed to a concrete disk-shaped structure, which most effectively counters the principal stress generated concentrically, uses as little tension material as possible, and uses an expensive fixing device. It is an object of the present invention to provide a low-cost pre-stress introduction technology which can reliably introduce and fix a tension while keeping the number to a minimum, and does not require partial reinforcement of a large number of fixing portions. .
【０００４】[0004]
【課題を解決するための手段】本発明は上記課題を解決
するために開発されたもので、その技術手段は、コンク
リート円盤状構造物の盤厚内に平面視渦巻き状のＰＣ緊
張材挿通ダクトを形成し、このダクトの途中にＰＣ緊張
材が露出する多数の中間緊張部を設け、このダクト内に
ＰＣ緊張材を挿通し、ＰＣ緊張材の一端の定着部から他
端方向へ向かって順次に、前記中間緊張部でＰＣ緊張材
を緊張し、ＰＣ緊張材他端で最終定着することを特徴と
するコンクリート円盤状構造物のプレストレス導入方法
である。DISCLOSURE OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and its technical means is to insert a PC tendon insertion duct having a spiral shape in plan view within the thickness of a concrete disk-shaped structure. The duct is provided with a number of intermediate tensioning portions in the middle of the duct where the PC tensioning material is exposed. The PC tensioning material is inserted into the duct, and the PC tensioning material is sequentially fixed from one fixing portion to the other end. In addition, there is provided a method for introducing prestress into a concrete disk-shaped structure, wherein a tension member of a PC is tensioned at the intermediate tension portion, and finally fixed at the other end of the tension member.
【０００５】ここで中間緊張部とは、ＰＣ緊張材挿通孔
の途中に設けられ、ＰＣ緊張材をジャッキなどで掴持し
て緊張力を付与することができる部分をいう。例えば版
体を貫通する貫通孔、版体の一面に開口した凹部などで
あって、その中にＰＣ緊張材が露出しており、貫通孔又
は凹部の内壁にＰＣ緊張材の緊張力の反力を受ける面が
形成されたものである。[0005] Here, the intermediate tension portion is a portion provided in the middle of the PC tension member insertion hole and capable of applying tension by holding the PC tension member with a jack or the like. For example, a through hole penetrating the plate, a concave portion opened on one surface of the plate, etc., in which the PC tendon is exposed, and the reaction force of the tension of the PC tendon on the inner wall of the through hole or concave portion. Receiving surface is formed.
【０００６】本発明は、ＰＣタンクなどの円筒形容器構
造物の底盤や蓋盤（頂盤）スケート場・遊技運動場、ヘ
リポート版体など、コンクリート円盤状構造物の盤厚内
に、円盤状の中心近傍から構造物外縁に至る平面視渦巻
き状のＰＣ緊張材挿通ダクトを形成し、このダクト内に
ＰＣ緊張材を挿通し、ＰＣ緊張材の一端を定着体に緊着
係止し、ＰＣ緊張材の他端に向かって、途中の中間緊張
部に露出するＰＣ緊張材を順次複数台のジャッキで掴持
して緊張してゆき、ＰＣ緊張材他端末端で最終定着す
る。中間緊張部はコンクリート円盤状構造物の上面又は
下面に中心近傍から放射状に設けた凹溝とすれば形成が
容易で好ましい。また、前記コンクリート円盤状構造物
としては円盤面が平面に限られるものではなく、断面が
周縁部から中心部に向かって湾曲している形状のもので
あっても好適に利用できる。この断面の湾曲形状の態様
は折れ線、なめらかな１又は複数の曲率半径を持つ曲
線、波形など何れであってもよい。The present invention relates to a disk-shaped concrete structure within the thickness of a concrete disk-shaped structure such as a bottom plate or a cover plate (top plate) skate rink, a game playground, a heliport plate or the like of a cylindrical container structure such as a PC tank. A spiral PC tension member insertion duct is formed from the vicinity of the center to the outer edge of the structure in a plan view, and the PC tension member is inserted into the duct, and one end of the PC tension member is tightly locked to the fixing body, thereby tightening the PC tension member. Towards the other end of the material, the PC tendon exposed at the intermediate tension portion in the middle is sequentially grasped and tensioned by a plurality of jacks, and finally fixed at the other end of the PC tendon. It is preferable to form the intermediate tension portion as a concave groove radially provided from the vicinity of the center on the upper surface or the lower surface of the concrete disk-shaped structure because it is easy to form. In addition, the concrete disk-shaped structure is not limited to a disk having a flat disk surface, but may be a structure having a cross section curved from a peripheral edge toward a center. The shape of the curved shape of the cross section may be any of a polygonal line, a curve having one or more smooth radii of curvature, and a waveform.
【０００７】本発明を好適に実施するには、本出願人が
別に提案している特開平９−３７９５３号公報に開示し
たＰＣストランド挿入用可搬式ピンチローラを用いると
長尺のＰＣ緊張材を渦巻き状ダクト内へ容易に挿通する
ことができる。In order to preferably carry out the present invention, the use of a portable pinch roller for inserting a PC strand disclosed in Japanese Patent Application Laid-Open No. Hei 9-37953, which has been separately proposed by the present applicant, enables the use of a long PC tendon. It can be easily inserted into the spiral duct.
【０００８】[0008]
【発明の実施の形態】以下図面を参照して本発明の実施
の形態を詳細に説明する。図１はコンクリート円盤状構
造物の例である。蓋体やスラブでもよく、基礎杭上に構
築されたスケート場やヘリポートなどでもよい。図１で
は円盤内に渦巻き状にＰＣ緊張材挿通孔２が設けられ、
その中にＰＣ緊張材３としてＰＣストランドが挿通され
ている。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a concrete disk-shaped structure. It may be a lid or a slab, a skating rink or a heliport built on a foundation pile. In FIG. 1, a PC tendon insertion hole 2 is provided in a spiral shape in a disk,
A PC strand is inserted therein as the PC tendon 3.
【０００９】図１は平面図で、円盤中心近傍より周縁に
向かって放射状に４本の凹溝４が設けられている。この
凹溝４は中間緊張部を形成するものである。ＰＣストラ
ンドはその一端を定着する定着部５が円盤の中心近傍に
設けられている。ＰＣストランドはこの定着部５から外
縁に向かって渦巻き状に配設され、ＰＣストランドの他
端が外縁のスリット内の定着部６で定着されている。図
２は図１のＡ−Ａ矢視断面図で、凹溝４内に配設された
ＰＣストランド３の位置を示しており、図３は図１のＢ
−Ｂ矢視断面図で凹溝４内のＰＣストランド３の他端の
定着部６を示している。このコンクリート円盤状構造物
は平板状であり、凹溝４は跡埋めコンクリートで埋めら
れ、表面仕上げを施される。FIG. 1 is a plan view in which four concave grooves 4 are provided radially from the vicinity of the center of the disk toward the periphery. The concave groove 4 forms an intermediate tension portion. The PC strand has a fixing unit 5 for fixing one end thereof, which is provided near the center of the disk. The PC strand is spirally disposed from the fixing section 5 toward the outer edge, and the other end of the PC strand is fixed by a fixing section 6 in a slit at the outer edge. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and shows the position of the PC strand 3 provided in the concave groove 4, and FIG.
The fixing section 6 at the other end of the PC strand 3 in the concave groove 4 is shown in a sectional view taken along the arrow B. This concrete disk-shaped structure is a flat plate, and the concave groove 4 is filled with trace-filled concrete and surface-finished.
【００１０】図４はプレストレス導入の説明図で、コン
クリート円盤状構造物１の中心部付近の平面図である。
ＰＣストランド３の一端を定着部５で定着し、この定着
部５から半周位置の凹溝４内に露出しているＰＣストラ
ンド３に第一のジャッキ３１を装着し、第一のジャッキ
３１を作動させて定着部５から第１のジャッキ３１まで
のＰＣストランド３に緊張力を導入する、次いで第一の
ジャッキ３１から更に半周位置の凹溝４内に露出してい
るＰＣストランド３に第二のジャッキ３２を装着し、第
一のジャッキ３１の緊張力を保持した状態で第二のジャ
ッキ３２を作動させてジャッキ３１、３２間のＰＣスト
ランドに緊張力を導入する、その後、第二のジャッキ３
２の緊張力を保持した状態のまま、第一のジャッキ３１
の緊張力を解放し、次のジャッキ装着位置に第一のジャ
ッキ３１を移動しこれをジャッキ３３とする。ジャッキ
３３で凹部４内に露出しているＰＣストランド３を掴持
し、ジャッキ３２、３３間のＰＣストランド３に緊張力
を導入する。ジャッキ３３の緊張力を保持した状態で第
二のジャッキ３２を解放してジャッキ３４位置に移動
し、再装着を行う。以上の緊張を順次ＰＣストランド３
の他端まで繰り返してＰＣストランド３全長にプレスト
レスを導入する。FIG. 4 is an explanatory view of the introduction of prestress, and is a plan view near the center of the concrete disk-shaped structure 1. FIG.
One end of the PC strand 3 is fixed by the fixing unit 5, and the first jack 31 is mounted on the PC strand 3 exposed from the fixing unit 5 in the concave groove 4 at a half circumferential position, and the first jack 31 is operated. Then, tension is applied to the PC strand 3 from the fixing unit 5 to the first jack 31. Then, the second strand is applied from the first jack 31 to the PC strand 3 exposed in the concave groove 4 at a further half circumferential position. With the jack 32 attached, the second jack 32 is operated while maintaining the tension of the first jack 31 to introduce tension into the PC strand between the jacks 31 and 32, and then the second jack 3
2 while maintaining the tension of the first jack 31.
Is released, and the first jack 31 is moved to the next jack mounting position, which is referred to as a jack 33. The PC strand 3 exposed in the recess 4 is gripped by the jack 33, and tension is applied to the PC strand 3 between the jacks 32 and 33. The second jack 32 is released and moved to the position of the jack 34 while maintaining the tension of the jack 33, and re-attached. PC strand 3
To the other end of the PC strand 3 to introduce a prestress.
【００１１】この場合のジャッキが緊張を行う位置は、
ＰＣストランドの曲率による摩擦を考慮して適切な位置
に決定すればよい。また、ＰＣ緊張材の周回数が多大に
なりメーカーより供給されるＰＣストランドの長さが不
足する場合は渦巻きの途中位置に他端を定着してもよ
い。この場合次のＰＣストランドとＰＣストランド同士
を接続するか、又は前記他端定着位置に次のＰＣストラ
ンドの一端を定着して上記緊張を開始することとしても
よい。In this case, the position where the jack is tensed is
An appropriate position may be determined in consideration of friction caused by the curvature of the PC strand. In the case where the number of turns of the PC tendon material becomes large and the length of the PC strand supplied by the manufacturer becomes insufficient, the other end may be fixed at a middle position of the spiral. In this case, the next PC strand may be connected to each other, or one end of the next PC strand may be fixed to the other end fixing position to start the tension.
【００１２】図５は図４のＣ−Ｃ矢視図で凹溝４内に装
着された緊張ジャッキ３３の正面図である。緊張ジャッ
キ３３は凹溝４内に露出したＰＣストランド３に被せる
ように装着することができるので移動するときも着脱が
容易である。FIG. 5 is a front view of the tension jack 33 mounted in the concave groove 4 as viewed in the direction of arrows CC in FIG. The tension jack 33 can be mounted so as to cover the PC strand 3 exposed in the concave groove 4, so that it can be easily attached and detached when moving.
【００１３】図６は図４のＤ−Ｄ矢視図で凹溝４内に装
着された緊張ジャッキ３３の側面図である。コンクリー
ト版８内にシース７で形成されたＰＣ緊張材挿通ダクト
内にＰＣストランド３が挿通され、このＰＣストランド
３は凹溝４内では露出しており、緊張ジャッキ３３のく
さびで掴持し、凹溝４内の壁面にジャッキ３３の反力を
支持させてＰＣストランドを緊張することができる。FIG. 6 is a side view of the tension jack 33 mounted in the concave groove 4 as viewed in the direction of the arrow DD in FIG. The PC strand 3 is inserted into the PC tendon insertion duct formed by the sheath 7 in the concrete plate 8, and the PC strand 3 is exposed in the concave groove 4, and is gripped by the wedge of the tension jack 33. By supporting the reaction force of the jack 33 on the wall surface in the concave groove 4, the PC strand can be tensioned.
【００１４】凹溝４はコンクリート版８のプレストレス
導入後シース７内にグラウトが施されると共に跡埋めコ
ンクリート９で埋められ、その表面仕上げをする。After the prestress of the concrete slab 8 is introduced, the concave groove 4 is grouted into the sheath 7 and filled with the trace filling concrete 9 to finish its surface.
【００１５】図７、８は別の実施例で、図９で示すよう
な流体を貯蔵するＰＣタンクなどの円筒形容器構造物の
底盤２２や蓋盤（頂盤）２１に適用したものである。図
７は図９のＨ−Ｈ矢視図で中心部が上方に滑らかに湾曲
した蓋盤２１を示している。図８は図９のＧ−Ｇ矢視図
で平板状の底版を示している。いずれも渦巻き状のＰＣ
ストランド挿通孔が版内に設けられ、中間緊張部として
は放射状の凹溝４が上面に設けられ、互いに交差し凹溝
４内にＰＣストランド挿通孔が開口している。図７、図
８のコンクリート円盤状構造物はそれぞれ図１で説明し
たように、渦巻き状に挿通したＰＣストランド３を中間
緊張部（凹溝４）に装入した緊張ジャッキでプレストレ
スを付与した構造である。この技術は、円形構造物のド
ーム形屋根のプレストレス導入にも適用することが可能
である。FIGS. 7 and 8 show another embodiment, which is applied to a bottom plate 22 and a lid plate (top plate) 21 of a cylindrical container structure such as a PC tank for storing a fluid as shown in FIG. . FIG. 7 is a view taken in the direction of the arrow HH in FIG. 9, and shows the lid board 21 whose center portion smoothly curves upward. FIG. 8 is a view taken along the line GG in FIG. 9 and shows a flat bottom plate. All are spiral PCs
A strand insertion hole is provided in the plate, a radial groove 4 is provided on the upper surface as an intermediate tension portion, and a PC strand insertion hole crosses each other and opens in the groove 4. As described with reference to FIG. 1, each of the concrete disc-shaped structures shown in FIGS. 7 and 8 is prestressed by a tension jack in which the PC strand 3 inserted in a spiral shape is inserted into the intermediate tension portion (concave groove 4). Structure. This technique can also be applied to prestress introduction of a dome-shaped roof of a circular structure.
【００１６】図１１〜１３は本発明のプレストレス導入
に最適な緊張ジャッキ３１の一例を示すもので、中間緊
張部内に装着可能な短尺な機長を有する。ＰＣストラン
ド４１の中間をくさび３７で掴持できるような、楔構造
を二本のシリンダ３５、ラム３６が連動してＰＣストラ
ンドに緊張力を付与する。図１２、１３はそれぞれ図１
１のＥ−Ｅ、Ｆ−Ｆ矢視図である。緊張ジャッキ３１は
ホース金具３８にホースを接続して図示省略してある流
体ポンプで駆動する。FIGS. 11 to 13 show an example of a tension jack 31 most suitable for introducing prestress according to the present invention, and has a short length capable of being mounted in an intermediate tension portion. The two cylinders 35 and the ram 36 cooperate with each other to apply a tension to the PC strand so that the wedge structure allows the middle of the PC strand 41 to be gripped by the wedge 37. 12 and 13 respectively show FIG.
FIG. 1 is a view taken along arrows EE and FF of FIG. The tension jack 31 is connected to a hose fitting 38 and is driven by a fluid pump (not shown).
【００１７】本例では、中間緊張部を４本の凹溝とした
例で説明したが、これに限定される訳ではなく、例えば
渦巻きの曲率によるＰＣストランドとダクトとの摩擦を
考慮し、内周付近では中間緊張部を多く配設し、比較的
曲率の緩い外周に行くに従って減少するなど適宜変更す
ることは可能である。In this embodiment, the description has been made of an example in which the intermediate tension portion is formed as four concave grooves. However, the present invention is not limited to this. For example, the friction between the PC strand and the duct due to the curvature of the spiral is taken into consideration, and In the vicinity of the circumference, a large number of intermediate tension portions are provided, and it is possible to make appropriate changes such as decreasing toward the outer circumference having a relatively small curvature.
【００１８】[0018]
【発明の効果】本発明の方法によれば、ＰＣタンクなど
の円筒形容器構造物の底盤や頂盤や、更にはスケート場
・遊技運動場、ヘリポートなどコンクリート円盤状構造
物の盤厚内に渦巻き状のＰＣ緊張材挿通ダクトを形成し
ておき、ＰＣ緊張材を挿通し、順次段階的に緊張してゆ
き、ＰＣ緊張材他端末端で最終定着するので高価な定着
体を最少２個で済ますことも可能となる。According to the method of the present invention, swirls are formed in the bottom and top of a cylindrical container structure such as a PC tank, and also within the thickness of a concrete disk-like structure such as a skate rink, a game playground, a heliport, and the like. A PC tendon insertion duct is formed, the PC tendon is inserted, and the PC tendon is gradually tightened, and the final fixation is performed at the other end of the PC tendon. It is also possible.
【図１】実施例の円盤状構造物の平面図である。FIG. 1 is a plan view of a disk-shaped structure according to an embodiment.
【図２】実施例の円盤状構造物の断面図である。FIG. 2 is a cross-sectional view of the disc-shaped structure of the embodiment.
【図３】実施例の円盤状構造物の定着部断面図である。FIG. 3 is a sectional view of a fixing portion of the disc-shaped structure of the embodiment.
【図４】実施例の手順説明図である。FIG. 4 is an explanatory diagram of a procedure in the embodiment.
【図５】ジャッキの正面図である。FIG. 5 is a front view of the jack.
【図６】ジャッキの側面図である。FIG. 6 is a side view of the jack.
【図７】円盤状構造物の平面図である。FIG. 7 is a plan view of the disc-shaped structure.
【図８】円盤状構造物の平面図である。FIG. 8 is a plan view of a disk-shaped structure.
【図９】タンクの一部断面側面図である。FIG. 9 is a partial sectional side view of a tank.
【図１０】従来の円盤状構造部のＰＣ緊張材の配置を示
す平面図である。FIG. 10 is a plan view showing the arrangement of a PC tendon in a conventional disk-shaped structure.
【図１１】ジャッキの説明図である。FIG. 11 is an explanatory view of a jack.
【図１２】ジャッキの説明図である。FIG. 12 is an explanatory diagram of a jack.
【図１３】ジャッキの説明図である。FIG. 13 is an explanatory diagram of a jack.
１ コンクリート円盤状構造物 ２ 渦巻き状ＰＣ緊張材挿通孔 ３ ＰＣ緊張材（ＰＣストランド） ４ 凹溝 ５、６ 定着部 ７ シース ８ コンクリート版（底盤） ９ 跡埋めコンクリート ２０ 容器構造物 ２１ 蓋版（蓋盤） ２２ 底版（底盤） ２３ 側壁 ２４ 地盤 ２５ 基礎杭 ３１，３２、３３、３４ ジャッキ ３５ シリンダ ３６ ラム ３７ くさび ４０ 円盤状構造物 ４１ ＰＣ緊張材 ４２ 定着具 DESCRIPTION OF SYMBOLS 1 Concrete disc-shaped structure 2 Spiral-shaped PC tendon insertion hole 3 PC tendon (PC strand) 4 Concave groove 5, 6 Fixing part 7 Sheath 8 Concrete slab (bottom) 9 Concrete filling 20 Container structure 21 Lid ( 22) Bottom plate (bottom plate) 23 Side wall 24 Ground 25 Foundation pile 31, 32, 33, 34 Jack 35 Cylinder 36 Ram 37 Wedge 40 Disc-shaped structure 41 PC tension member 42 Fixing tool
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｅ０４Ｈ 7/20 Ｅ０４Ｈ 7/20 (58)調査した分野(Int.Cl.7，ＤＢ名) E04B 1/06 E04C 5/00 - 5/20 E04G 21/12 104 E04H 7/20 E04B 1/32 102 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 identification code FI E04H 7/20 E04H 7/20 (58) Investigated field (Int.Cl. 7 , DB name) E04B 1/06 E04C 5/00 -5/20 E04G 21/12 104 E04H 7/20 E04B 1/32 102
Claims (3)
面視渦巻き状のＰＣ緊張材挿通ダクトを形成し、該ダク
トの途中にＰＣ緊張材が露出する多数の中間緊張部を設
け、該ダクト内にＰＣ緊張材を挿通し、該ＰＣ緊張材の
一端の定着部から他端方向へ向かって順次に、前記中間
緊張部でＰＣ緊張材を緊張し、ＰＣ緊張材他端で最終定
着することを特徴とするコンクリート円盤状構造物のプ
レストレス導入方法。1. A spiral duct for inserting a PC tendon material in a plan view within a thickness of a concrete disc-shaped structure, and a plurality of intermediate tension portions through which the PC tendon material is exposed are provided in the duct. A PC tendon is inserted into the inside of the PC tendon, and the PC tendon is tensioned at the intermediate tension portion in order from the fixing portion at one end to the other end, and finally fixed at the other end of the PC tendon. A method for introducing prestress into a concrete disk-shaped structure, characterized by comprising:
造物の上面又は下面に放射状に設けた、１又は複数条の
凹溝からなることを特徴とする請求項１記載のコンクリ
ート円盤状構造物のプレストレス導入方法。2. The concrete disk-shaped structure according to claim 1, wherein the intermediate tension portion comprises one or a plurality of grooves radially provided on an upper surface or a lower surface of the concrete disk-shaped structure. Prestress introduction method.
が周縁から中心部に向かって湾曲している形状であるこ
とを特徴とする請求項１又は２記載のコンクリート円盤
状構造物のプレストレス導入方法。3. The concrete disk-shaped structure according to claim 1, wherein the concrete disk-shaped structure has a cross section curved from a peripheral edge toward a central portion. Method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000010310A JP3281351B2 (en) | 2000-01-17 | 2000-01-17 | Prestressing method for concrete disk-shaped structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000010310A JP3281351B2 (en) | 2000-01-17 | 2000-01-17 | Prestressing method for concrete disk-shaped structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001200582A JP2001200582A (en) | 2001-07-27 |
| JP3281351B2 true JP3281351B2 (en) | 2002-05-13 |
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|---|---|---|---|
| JP2000010310A Expired - Lifetime JP3281351B2 (en) | 2000-01-17 | 2000-01-17 | Prestressing method for concrete disk-shaped structure |
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| US9783950B2 (en) | 2014-10-07 | 2017-10-10 | Allan P. Henderson | Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like |
| US11661718B2 (en) | 2018-07-25 | 2023-05-30 | Terracon Consultants, Inc. | Concrete pier foundation with lateral shear reinforcing loops and methods of constructing the same |
| US11365523B2 (en) | 2018-11-13 | 2022-06-21 | Terracon Consultants, Inc. | Methods for constructing tensionless concrete pier foundations and foundations constructed thereby |
| US11885092B2 (en) | 2019-01-31 | 2024-01-30 | Terracon Consultants, Inc. | Reinforcement structures for tensionless concrete pier foundations and methods of constructing the same |
| US11274412B2 (en) | 2019-01-31 | 2022-03-15 | Terracon Consultants, Inc. | Reinforcement structures for tensionless concrete pier foundations and methods of constructing the same |
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2000
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|---|---|
| JP2001200582A (en) | 2001-07-27 |
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