JPH0657944B2 - Crimping type post-fixing fixtures for prestressed concrete piles and pile head treatment method using post-fixing fixtures - Google Patents
Crimping type post-fixing fixtures for prestressed concrete piles and pile head treatment method using post-fixing fixturesInfo
- Publication number
- JPH0657944B2 JPH0657944B2 JP1140997A JP14099789A JPH0657944B2 JP H0657944 B2 JPH0657944 B2 JP H0657944B2 JP 1140997 A JP1140997 A JP 1140997A JP 14099789 A JP14099789 A JP 14099789A JP H0657944 B2 JPH0657944 B2 JP H0657944B2
- Authority
- JP
- Japan
- Prior art keywords
- fixing
- pile head
- pile
- steel rod
- end plate
- 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 - Fee Related
Links
Landscapes
- Piles And Underground Anchors (AREA)
- Foundations (AREA)
- Reinforcement Elements For Buildings (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
本発明は、プレストレストコンクリート杭の杭頭と鉄筋
(アンカーボルト)を接合する定着具およびこれを用い
た杭頭処理工法に関する。TECHNICAL FIELD The present invention relates to a fixing tool for joining a pile head of a prestressed concrete pile and a reinforcing bar (anchor bolt) and a pile head treatment method using the fixing tool.
本発明は、建築及び土木のプレストレストコンクリート
杭基礎構造において耐震性の高い杭頭接合構造を得る事
を目的とするもので、通常のプレストレストコンクリー
ト杭にその構造を変える事なく容易に後付け出来、かつ
PC鋼棒の耐久性能と同等の接続性能が確保出来る圧着
型後付け定着具とその定着具による杭頭処理工法の提供
を目的とする。The present invention is intended to obtain a highly earthquake-resistant pile head joint structure in a prestressed concrete pile foundation structure for construction and civil engineering, and can be easily retrofitted to a normal prestressed concrete pile without changing its structure, and An object of the present invention is to provide a crimping type post-fixing fixture that can secure a connection performance equivalent to the durability performance of a PC steel rod and a pile head treatment method using the fixing fixture.
プレストレストコンクリート杭は、高強度のコンクリー
トと高張力のPC鋼棒を組み合わせかつ、PC鋼棒を緊
張してプレストレスを導入することにより大きな曲げ耐
力を発生する形式の杭である。 この杭種による基礎工法では工場製造により高強度で高
品質な杭体部が形成される反面、杭頭接合部の耐震性に
おいて杭端部構造が基礎スラブに配筋する鉄筋(アンカ
ーボルト)との接合を考えて製造されていない為、その
接続金具は開発されておらず、接続構造や接続施工の面
で十分な対応がなされていない現状にある。 わずかに従来、耐震性の高い杭頭接合部を得る杭頭処理
工法や定着具としては、次のものが開示されている。 杭頭部に雌ねじカプラーを埋め込み上部構造接続鉄筋
の定着孔を形成する方法 端板上に設けられた雌ねじ孔に単に雄ねじ部を持つ鉄
筋を定着する方法 (特公昭53−40802号) 合成樹脂成型品の連結具で、下部にテーパーを形成
し、皿部のテーパー孔と嵌合し、連結具の上部に雌ねじ
が穿設されていて、この雌ねじに補強筋の垂直筋の先端
に螺設された雄ねじがねじ込まれ連結固定される構造が
開示されている(実開昭58−54449号公報)。 ナットをPC鋼棒3に螺入して基礎を定着するととも
に、PC鋼棒3の先端をナットより突出せしめておく。
次にカップラーをこの突出したPC鋼棒3の先端に、ま
たカップラーの反対側からクッションリングベースを貫
通したPC鋼棒4を夫々半分程螺入し、PC鋼棒3とP
C鋼棒4とを連結する構成が開示されている(実開昭4
9−126395号)。The prestressed concrete pile is a type of pile in which a high bending strength is generated by combining a high-strength concrete and a high-strength PC steel rod and introducing prestress by tensioning the PC steel rod. In the foundation method using this pile type, a high-strength and high-quality pile body part is formed by factory manufacturing, but in the earthquake resistance of the pile head joint, the pile end structure and the reinforcing bar (anchor bolt) that rebars the foundation slab. Since it has not been manufactured in consideration of joining, the connection metal fittings have not been developed, and the current situation is that the connection structure and connection construction have not been adequately dealt with. Conventionally, the following have been disclosed as a pile head processing method and a fixing tool for obtaining a pile head joint having a slightly high earthquake resistance. Method of embedding female screw coupler in pile head and forming fixing hole of superstructure connection reinforcing bar Method of simply fixing reinforcing bar having male screw part in female screw hole provided on end plate (Japanese Patent Publication No. 53-40802) Synthetic resin molding With a connector of the product, a taper is formed in the lower part, it fits into the tapered hole of the dish part, and a female screw is drilled in the upper part of the connector, and this female screw is screwed to the tip of the vertical bar of the reinforcing bar. Japanese Patent Laid-Open No. 58-54449 discloses a structure in which a male screw is screwed and connected and fixed. The nut is screwed into the PC steel rod 3 to fix the foundation, and the tip of the PC steel rod 3 is projected from the nut.
Next, a coupler is screwed into the tip of the protruding PC steel rod 3 and a half of the PC steel rod 4 penetrating the cushion ring base from the opposite side of the coupler.
A configuration for connecting with the C steel rod 4 is disclosed (Actually, Shokai 4
9-126395).
しかしながら、前記従来技術には、次のような問題点が
あった。 前者は、杭の製造工程の改善が必要とする事、製造効
率の低下、構造的不完全さ及び杭の施工が精度良く行わ
れない場合は杭頭部を割砕(カットオフ)する事態とな
り無駄となることがある等の問題があった。 一方後者は、鉄筋を定着する端板の厚さは通常9mm〜
19mm程度と薄く、かつ杭頭端板の雌ねじは「ひょうた
ん型」の欠損部を有する不完全ボルト孔であるため、強
度的に必要な定着性能が確保されない等の問題を残して
いる。 例えば、杭頭端板の雌ねじは、材質が、軟鋼であるた
め、構造時において損傷および強度低下している場合も
あり、単に接続鉄筋を連結しただけでは接合部の固着力
が所定の強度になっているかどうかは確認できないので
ある。 欠損部を有する不完全ボルト孔を永久構造物のボルト孔
として利用するためには、強度の確認及び保証が必要で
ある。 また前記の公開技術は、皿部との結合はテーパー孔へ
装填することでなされ、下方のPC鋼棒との連結には何
らの構成もないものである。 前記の公開技術は、上部PC鋼棒と下部PC鋼棒を垂
直方向に連結するものである。 下部PC鋼棒先端はナットを貫通しており、ナットは単
に連結嵌合にすぎずPC鋼棒への下向きの接触圧は付与
できない。また雄ねじの構成がないので、杭頭端板への
固着力はないものである。However, the above conventional technique has the following problems. The former requires the improvement of the manufacturing process of piles, the reduction of manufacturing efficiency, structural imperfections, and the situation where pile heads are cut off (cutoff) when the construction of piles is not performed accurately. There was a problem that it was wasted. On the other hand, in the latter, the thickness of the end plate for fixing the reinforcing bar is usually 9 mm ~
Since the internal thread of the pile head end plate is as thin as about 19 mm and it is an incomplete bolt hole having a “gourd-shaped” defect, there is a problem that the fixing performance required for strength cannot be secured. For example, the internal thread of the pile head end plate is made of mild steel, so it may be damaged and the strength may be reduced during construction.If the connecting rebar is simply connected, the fixing force of the joint will reach the specified strength. It is not possible to confirm whether or not it is. In order to use an incomplete bolt hole having a defective portion as a bolt hole of a permanent structure, it is necessary to confirm and guarantee the strength. Further, in the above-mentioned publicly disclosed technique, the connection with the dish portion is made by loading the taper hole, and the connection with the lower PC steel bar has no structure. The disclosed technology is to vertically connect an upper PC steel bar and a lower PC steel bar. The tip of the lower PC steel rod penetrates the nut, and the nut is merely a connection fitting and cannot apply downward contact pressure to the PC steel rod. Also, since there is no male screw structure, there is no fixing force to the pile head end plate.
本発明では、杭頭端板に取付ける圧着型で後付け定着具
を開発したことにより、前記問題点を解決するものであ
る。 [定着具の構成] 定着具は、プレストレストコンクリート杭の杭頭端板に
ねじ込まれ、これに基礎スラブの接続鉄筋(アンカーボ
ルト)を接続するものであって、 接続鉄筋を螺入する雌ねじ定着孔を上面に設けた鉄筋定
着部を設け、下面にPC鋼棒端部に圧着する圧着固定部
と前記杭頭端板上面を支圧する支圧固定部を設けた頭部
を有しかつ下面に前記杭頭端板の雌ねじ孔に螺合する雄
ねじを形成したものである。 定着具は、杭頭端板のPC鋼棒定着部に近接して設けた
雌ねじ孔に当該定着具の雄ねじを挿入螺合し、次に定着
具の頭部(レンチ等によって締め付けるので、頭部外周
は6角形などのナット形状が好ましい)を締め付け圧着
し、杭頭端板を介してPC鋼棒端部に圧着固定部の推進
方向と逆の移動を起こし(図中矢印12)、PC鋼棒端
部と圧着固定部とに接触圧を発生させて杭頭端板に固定
する。 また、定着具の螺合締付けは、頭部へ所定トルクを付与
した締め付け等により、あとで杭に定着する接続鉄筋
(アンカーボルト)の引張強度以上の固着力を発生させ
ておく。 そして、しっかりと定着具を締め付けることで杭頭端板
と定着具の間に接触圧を発生させることになる。 本発明の定着具は、予め強く螺合しその下面をPC鋼棒
端部と端板上面に圧着するものとなっており、かつ杭に
接続鉄筋を容易に連結できるのである。 [杭頭処理工法の構成] 前記定着具を用いた杭頭処理工法は、 定着具の該雄ねじを、プレストレストコンクリート杭の
杭頭端板のPC鋼棒定着部に近接して設けた雌ねじ孔に
頭部締め付けによりねじ込むことにより接続鉄筋の引張
強度以上の固着力を発生させかつ圧着固定部とPC鋼棒
端部とに接触圧を発生させて杭頭端板に固定し、その後
に前記定着具に接続鉄筋を接続しこの接続鉄筋を基礎ス
ラブと杭との連結筋とすることを特徴とするものであ
る。 この工程により、基礎スラブとプレストレストコンクリ
ート杭を一体化する杭頭処理工法である。 この後コンクリートの打設等を行ない基礎を構築する。 この工法は、杭頭の割砕の必要がないのはもとより、P
C鋼棒と接続鉄筋の接続構造が直線的で堅固でありかつ
耐震性に優れたものが提供できる。The present invention solves the above-mentioned problems by developing a post-fixing fixing device of a crimping type that is attached to a pile head end plate. [Structure of anchoring device] The anchoring device is to be screwed into the pile head end plate of the prestressed concrete pile and to connect the connecting reinforcing bar (anchor bolt) of the foundation slab to this, and the female screw fixing hole into which the connecting reinforcing bar is screwed Is provided on the upper surface, and a head is provided on the lower surface, which has a crimp fixing portion for crimping to the end of the PC steel rod and a bearing fixing portion for supporting the upper surface of the pile head end plate, A male screw that is screwed into the female screw hole of the pile head end plate is formed. In the fixing tool, the male screw of the fixing tool is inserted and screwed into the female screw hole provided near the PC steel rod fixing portion of the pile head end plate, and then the head of the fixing tool (because it is tightened with a wrench etc. The outer periphery is preferably a nut shape such as a hexagon), and is crimped, and the PC steel rod end is moved through the pile head end plate in a direction opposite to the pushing direction of the crimp fixing part (arrow 12 in the figure). A contact pressure is generated between the rod end and the crimp fixing part to fix it to the pile head end plate. Further, in the tightening of the fixing tool by screwing, a fixing force equal to or higher than the tensile strength of the connecting rebar (anchor bolt) to be fixed to the pile later is generated by tightening the head with a predetermined torque or the like. Then, by firmly tightening the fixing tool, a contact pressure is generated between the pile head end plate and the fixing tool. The fixing device of the present invention is designed to be strongly screwed in advance and the lower surface thereof is crimped to the end portion of the PC steel rod and the upper surface of the end plate, and the connecting reinforcing bar can be easily connected to the pile. [Construction of pile head treatment method] In the pile head treatment method using the fixing tool, the male screw of the fixing tool is formed in a female screw hole provided in the pile head end plate of the prestressed concrete pile near the fixing portion of the PC steel rod. By screwing by tightening the head, a fixing force greater than the tensile strength of the connecting reinforcing bar is generated, and a contact pressure is generated between the crimping fixing portion and the end of the PC steel rod to fix it to the pile head end plate, and then the fixing tool. It is characterized in that a connecting reinforcing bar is connected to and the connecting reinforcing bar is used as a connecting bar between the foundation slab and the pile. This process is a pile head treatment method that integrates the foundation slab and prestressed concrete pile. After this, concrete is placed and the foundation is constructed. This method does not require the crushing of pile heads,
It is possible to provide a structure in which the C steel rod and the connecting rebar have a linear and rigid connection structure and excellent earthquake resistance.
ここで本発明の定着具およびこれを用いた工法の一実施
例を図面に基づいて具体的に説明する。 [定着具] 定着具20は、プレストレストコンクリート杭の杭頭端板
9と基礎スラブの接続鉄筋(アンカーボルト)1を接続
するものであって、接続鉄筋1の雌ねじ定着孔2を上面
に設けた鉄筋定着部3と下面にPC鋼棒10端部に圧着
する圧着固定部4と前記杭頭端板9の上面に支圧を発生
させる支圧固定部5とを設けた頭部6を有しその下面に
雄ねじ7を形成したものである。 図示の定着具20の形状は、上部に細い短筒部を形成し下
部を錐形に広げた形状である。 定着具20はその頭部6をレンチ等によって締め付けるの
で、頭部6の外形は締め付け易い形状に成型する。 この定着具20は、PC鋼棒10の端部(定着部)11に近
接して杭頭端板9に設けた雌ねじ孔8に下方の雄ねじ7
をねじ込み挿入し、次に頭部6を締め付けて杭頭端板9
を介してPC鋼棒端部11に圧着固定部4の推進方向と逆
の移動を起こし(図中矢印12)、PC鋼棒端部11と圧
着固定部4を圧着して取付ける。 この定着状態に於いて、PC鋼棒10の端部11には上向
きの作用力12と圧着固定部4には下向きの抵抗力13
が発生している。 つまり接触圧が生じる。 この定着具20は、接続鉄筋1の定着を鉄筋定着部3にあ
る雌ねじ定着孔2にねじ式接合して行うが、鉄筋定着部
3と圧着固定部4の構造的一体性は、定着具20の頭部6
がPC鋼棒10に接続された支持構造として保有する強度
と剛性により確保する。 定着具20は、工場などで予めPC鋼棒端部11を圧着する
ように強い固着力で杭頭端板9に取り付けられる。 定着具20は、環状の杭頭端板9の大きさやPC鋼棒の数
に応じ、適当数取り付けられる。 本発明で提案する定着具20は、工場等で予め杭頭端板9
に圧着し、次いでそのプレストレストコンクリート杭に
接続鉄筋1を後付けするので、圧着型後付け定着具と指
称している。 なお杭頭端板9は、金属製の環状板で、PC鋼棒10の端
部11を上面に露設する錐形の挿入孔であるPC鋼棒定着
部を設けて、これに貫通して適宜数のPC鋼棒10を張設
し、そのPC鋼棒端部11に近接して適宜数の雌ねじ孔8
を設けている。 定着具20は、雄ねじ7を杭頭端板9の雌ねじ孔8に螺合
され、例えば第2図のように左右に位置するPC鋼棒端
部11を定着固定部4で圧着し、また前後に位置するとこ
ろで杭頭端板9の上面を支圧固定部5で支圧する。 第3図は、第2図のものと異なり、一本のPC鋼棒10に
対して一本の接続鉄筋1を定着する圧着型後付け定着具
20が杭端部に圧着された状態の断面図である。 この定着具20は、雄ねじ部7の片側にPC鋼棒10の端部
11を圧着する圧着固定部4を設け、この接触圧のために
発生する曲げモーメントに対して杭頭端板9に支圧を発
生させて抵抗させる支圧固定部5を、前記圧着固定部4
の反対側の頭部6下面に形成したものである。 圧着固定部4と支圧固定部5は、杭頭端板9に圧接する
ので、連結立設した接続鉄筋1へ横方向の負荷がかかっ
ても、その接触圧により定着具20の雄ねじ7部への直接
的な負荷は軽減できる構造となっている。 この定着具20を使用して接続したプレストレストコンク
リート杭のPC鋼棒10と接続鉄筋1とは、直線的に接続
される。 [杭頭処理工法] 前記定着具20を用いた杭頭処理工法は、定着具20をプレ
ストレストコンクリート杭の杭頭端板9に固着し、次に
この定着具20に接続鉄筋1を定着し、この鉄筋1を基礎
スラブと杭との連結筋とすることを特徴とする後付け定
着具による杭頭処理工法である。 施工作業順に詳細に説明すると、 A:工場等で予め、定着具20をプレストレストコンクリ
ート杭の杭頭端板9にその下面がPC鋼棒端部11を圧着
しかつ端板9上面に支圧するよう取り付ける。 作業手順としては、定着具20の取り付け位置を杭頭端板
9にマーキングし、杭頭端板9の雌ねじ孔を清掃し、定
着具20を仮締めする。その後で本締めする。 なおその後は従来のとおり、 そのプレストレストコンクリート杭を現場に搬入し、沈
設しさらに沈設後に、定着具20を損傷しないように根切
りを行ない根切り底にコンクリートを打設する。 B:定着具20の上面の雌ねじ2に基礎スラブの接続鉄筋
(アンカーボルト)1を取付け植設する。 の工程により基礎スラブの連結筋とプレストレストコン
クリート杭を一体化する杭頭処理工法である。 。この後コンクリートの打設等を行ない基礎を構築する
のである。 この工法は、杭頭の割砕(カットオフ)の必要がないの
はもとより、PC鋼棒と接続鉄筋の接続構造が直線的で
堅固でありかつ耐震性に優れたものが提供できる。 なおこれらの実施例はあくまで一例であって、本発明の
思想はこれらに限定されるものではない。Here, an embodiment of the fixing tool of the present invention and a construction method using the fixing tool will be specifically described with reference to the drawings. [Fixing Tool] The fixing tool 20 connects the pile head end plate 9 of the prestressed concrete pile and the connecting reinforcing bar (anchor bolt) 1 of the foundation slab, and the female screw fixing hole 2 of the connecting reinforcing bar 1 is provided on the upper surface. It has a head portion 6 provided with a reinforcing bar fixing portion 3, a crimp fixing portion 4 for crimping the end of the PC steel rod 10 on the lower surface, and a bearing pressure fixing portion 5 for generating bearing pressure on the upper surface of the pile head end plate 9. A male screw 7 is formed on the lower surface thereof. The shape of the fixing device 20 shown is a shape in which a thin short tube portion is formed in the upper portion and the lower portion is expanded in a cone shape. Since the fixing tool 20 has its head 6 tightened with a wrench or the like, the outer shape of the head 6 is molded into a shape that is easy to tighten. This fixing tool 20 has a male screw 7 below a female screw hole 8 provided in the pile head end plate 9 in the vicinity of the end (fixing portion) 11 of the PC steel rod 10.
Screw in and then tighten the head 6 to tighten the pile head end plate 9
Then, the PC steel rod end 11 is moved in the direction opposite to the propelling direction of the crimp fixing part 4 (arrow 12 in the figure), and the PC steel rod end 11 and the crimp fixing part 4 are crimped and attached. In this fixing state, an upward acting force 12 is exerted on the end portion 11 of the PC steel rod 10 and a downward resistance force 13 is exerted on the crimp fixing portion 4.
Is occurring. That is, contact pressure is generated. In this fixing tool 20, the connection reinforcing bar 1 is fixed by screwing to the female screw fixing hole 2 in the reinforcing bar fixing section 3, but the structural integrity of the reinforcing bar fixing section 3 and the crimp fixing section 4 is determined by the fixing tool 20. Head 6
Is secured by the strength and rigidity possessed as a support structure connected to the PC steel rod 10. The fixing tool 20 is attached to the pile head end plate 9 with a strong fixing force so as to press the PC steel rod end 11 in advance at a factory or the like. An appropriate number of fixing tools 20 are attached according to the size of the annular pile head end plate 9 and the number of PC steel rods. The fixing tool 20 proposed by the present invention is used in advance in a factory or the like in order to remove the pile head end plate 9
Since the connecting rebar 1 is attached to the prestressed concrete pile afterwards, it is referred to as a crimp type post-fixing fixture. The pile head end plate 9 is an annular plate made of metal and provided with a PC steel rod fixing portion which is a conical insertion hole for exposing the end portion 11 of the PC steel rod 10 on the upper surface, and penetrates through this. An appropriate number of PC steel rods 10 are stretched, and an appropriate number of female screw holes 8 are provided near the PC steel rod end portion 11.
Is provided. In the fixing tool 20, the male screw 7 is screwed into the female screw hole 8 of the pile head end plate 9, and, for example, the PC steel rod end portions 11 located on the left and right are crimped by the fixing fixing portion 4 as shown in FIG. The upper surface of the pile head end plate 9 is supported by the support pressure fixing portion 5 at a position located at. Unlike FIG. 2, FIG. 3 is a crimp type post-fixing fixture for fixing one connecting rebar 1 to one PC steel rod 10.
FIG. 20 is a cross-sectional view showing a state where 20 is crimped to the pile end portion. This fixing tool 20 has an end portion of the PC steel rod 10 on one side of the male screw portion 7.
The crimp fixing part 4 for crimping 11 is provided, and the pressure supporting part 5 for generating and resisting the supporting pressure on the pile head end plate 9 against the bending moment generated by this contact pressure is used as the crimp fixing part 4.
It is formed on the lower surface of the head portion 6 on the opposite side. Since the crimp fixing portion 4 and the bearing supporting portion 5 are in pressure contact with the pile head end plate 9, even if a lateral load is applied to the connecting rebar 1 which is connected and erected, due to the contact pressure, 7 parts of the male screw of the fixing tool 20 are attached. It has a structure that can reduce the direct load on. The PC steel rod 10 of the prestressed concrete pile connected using the fixing tool 20 and the connecting rebar 1 are linearly connected. [Pile head treatment method] In the pile head treatment method using the fixing tool 20, the fixing tool 20 is fixed to the pile head end plate 9 of the prestressed concrete pile, and then the connecting rebar 1 is fixed to the fixing tool 20. This is a pile head treatment method using a retrofitting fixing tool, characterized in that the reinforcing bar 1 is used as a connecting bar between a foundation slab and a pile. Explaining in detail in the order of construction work, A: In a factory or the like, the fixing tool 20 is preliminarily attached to the pile head end plate 9 of the prestressed concrete pile so that the lower surface thereof is crimped to the PC steel rod end portion 11 and bears against the upper surface of the end plate 9. Install. As a work procedure, the mounting position of the fixing tool 20 is marked on the pile head end plate 9, the female screw hole of the pile head end plate 9 is cleaned, and the fixing tool 20 is temporarily tightened. Then tighten the book. After that, as before, the prestressed concrete pile is carried into the site, sunk, and after sunk, root cutting is performed so that the fixing tool 20 is not damaged, and concrete is placed on the root cutting bottom. B: Attach the connection bar (anchor bolt) 1 of the base slab to the female screw 2 on the upper surface of the fixing tool 20 and plant it. This is the pile head treatment method that integrates the connecting bar of the foundation slab and the prestressed concrete pile by the process of. . After this, concrete is poured and the foundation is constructed. This construction method can provide a structure in which the connection structure of the PC steel rod and the connecting rebar is linear and strong and has excellent earthquake resistance, as well as the need for crushing the pile head (cutoff). Note that these examples are merely examples, and the idea of the present invention is not limited to these.
本発明に係る「プレストレストコンクリート杭の圧着型
後付け定着具と後付け定着具による杭頭処理工法」は、
前記構成および作用であり、次のような特有の技術的効
果がある。 ◇定着具の頭部に加える締め付け具合(トルク及び回転
角の調整)で必要な定着性能を持つ定着具を杭頭端部に
固着出来る。 ◇PC鋼棒と接続鉄筋とが定着具を介し直接的に接続さ
れる為、効率的な応力伝達機構を持つ耐震性の高い杭頭
接合構造が形成される。 ◇定着具の杭頭端板上に高く突出しているので、杭の沈
設作業時に定着具に付着する泥土、及びソイルセメント
等を除去清掃するのが容易である。 ◇杭の施工結果に対して、後付け定着による杭頭処理が
可能な状況を確保した上で施工できるので、確実かつ無
駄がない。 ◇割砕(カットオフ)に伴うプレストレス量の減少によ
る強度低下と抗体損傷がない。 ◇従来の端部構造のプレストレストコンクリート杭にそ
のまま適用できる。 ◇構造上(経済上)廉価に製造でき、杭頭割砕処理費及
び割砕に伴う中詰め補強工事費が不要になる。 ◇杭頭割砕工事等が不要であり、特殊な作業技術を要さ
ず工期短縮や現場的要請にかなう。 ◇杭頭端版に対して、定着具は下方方向の力で圧しかつ
雄ねじの螺入は、PC鋼棒に接触圧により上下方向の力
を与えかつPC鋼棒の上方端部へ下方方向の力を作用す
るので堅固な定着ができる。 以上のように、本発明は、杭頭と基礎スラブとの接合技
術において、接合性能・安全性を向上でき、杭頭処理工
法に多大な有用性を提供する価値ある優れた発明という
べきである。"Crimping type post-fixing fixture for prestressed concrete pile and pile head treatment method by post-fixing fixture" according to the present invention,
The above-mentioned configuration and operation have the following unique technical effects. ◇ The fixing tool with the required fixing performance can be fixed to the pile head end by the tightening condition (torque and rotation angle adjustment) applied to the head of the fixing tool. ◇ Since the PC steel rod and the connecting rebar are directly connected through the fixing tool, a highly earthquake-resistant pile head joint structure with an efficient stress transmission mechanism is formed. ◇ Since it protrudes high on the pile head end plate of the fixing tool, it is easy to remove and clean the mud and soil cement adhering to the fixing tool when the pile is sunk. ◇ Concerning the pile construction results, construction can be performed after ensuring that pile head processing by retrofitting is possible, so there is no waste and no waste. ◇ No decrease in strength and no antibody damage due to reduction in prestress amount due to crushing (cutoff). ◇ It can be applied as is to conventional prestressed concrete piles with end structures. ◇ The structure (economically) can be manufactured at a low cost, and the pile head crushing treatment cost and the filling work cost for filling in the middle due to crushing are unnecessary. ◇ Pile head crushing work is not required, and special work techniques are not required, which shortens the construction period and meets site requirements. ◇ The fixing tool is pressed against the pile head end plate by a downward force, and the male screw is screwed into the steel plate to give a vertical force to the PC steel bar due to the contact pressure and to the upper end of the PC steel bar in the downward direction. Since force is applied, firm fixation can be achieved. As described above, the present invention, in the joining technology of the pile head and the foundation slab, can improve the joining performance and safety, and should be a valuable and excellent invention that provides great utility to the pile head treatment method. .
図面は、本発明にかかる「プレストレストコンクリート
杭の圧着型後付け定着具と後付け定着具による杭頭処理
工法」の定着具の実施例を示すものであり、第1図は本
発明の定着具の平面図であり、第2図は定着具を杭頭端
板に取付けた状態の断面図である。 第3図は、定着具の異なる実施例であり、一本のPC鋼
棒に対して一本の接続鉄筋を定着するタイプの定着具が
杭頭端板に圧着された状態の断面図である。 符号の簡単な説明 1……接続鉄筋 20……定着具 2……接続鉄筋の雌ねじ定着孔 3……定着具の鉄筋定着部 4……PC鋼棒端部へ圧着する定着具の圧着固定部 5……定着具の支圧固定部 6……定着具の頭部 7……定着具の雄ねじ部 8……杭頭端板に設けた雌ねじ孔 9……杭頭端板 10……PC鋼棒 11……PC鋼棒端部 12……圧着状態でのPC鋼棒端部に発生する上向きの作
用力 13……圧着状態での圧着固定部に発生する下向きの抵抗
力The drawings show an embodiment of a fixing tool of "crimp type post-fixing fixture for prestressed concrete pile and pile head treatment method using post-fixing fixture" according to the present invention, and FIG. 1 is a plan view of the fixing fixture of the present invention. FIG. 2 is a sectional view of a state in which the fixing tool is attached to the pile head end plate. FIG. 3 is a cross-sectional view showing another embodiment of the fixing tool, in which a fixing tool of a type for fixing one connecting rebar to one PC steel rod is crimped to the pile head end plate. . Short description of the code 1 …… Connecting rebar 20 …… Fixing tool 2 …… Female thread fixing hole of connecting rebar 3 …… Reinforcing bar fixing section of fixing tool 4 …… Crimping fixing section of fixing tool for crimping to PC steel rod end 5 …… Fixing tool bearing pressure fixing part 6 …… Fixing tool head 7 …… Fixing tool male screw part 8 …… Female screw hole provided in pile head end plate 9 …… Pile head end plate 10 …… PC steel Rod 11 …… PC steel rod end 12 …… Upward acting force generated at the PC steel rod end in the crimped state 13 …… Downward resistance force generated at the crimp fixed part in the crimped state
Claims (2)
ブの接続鉄筋1を接続するものであって、 プレストレストコンクリート杭頭に、PC鋼棒10の端部
11をPC鋼棒定着部に貫通露設しかつ前記PC鋼棒端部
11に近接して雌ねじ孔8を設けた杭頭端板9を設け、 この杭頭端板9に接続鉄筋1を接続する定着具として、
接続鉄筋1の雌ねじ定着孔2を上面に設けた鉄筋定着部
3と下面にPC鋼棒端部11に圧着する圧着固定部4と前
記杭頭端板9に支圧を発生させる支圧固定部5を設けた
頭部6を有しかつさらに下面に前記杭頭端板9の雌ねじ
孔8に螺合する雄ねじ7を形成したことを特徴とするプ
レストレストコンクリート杭の圧着型後付け定着具。1. A prestressed concrete pile for connecting a reinforcing bar 1 of a foundation slab, wherein a prestressed concrete pile head and an end of a PC steel rod 10 are connected.
11 is penetrated to the fixing portion of the PC steel rod and the end portion of the PC steel rod is
Providing a pile head end plate 9 provided with a female screw hole 8 in the vicinity of 11, and as a fixing tool for connecting the connecting rebar 1 to the pile head end plate 9,
Reinforcing bar fixing part 3 provided with female screw fixing hole 2 of connecting reinforcing bar 1 on the upper surface, crimp fixing part 4 for crimping to PC steel rod end part 11 on the lower surface, and bearing pressure fixing part for generating bearing pressure on the pile head end plate 9. A crimping type post-fixing fixture for a prestressed concrete pile, comprising a head 6 provided with 5 and further having a male screw 7 screwed into the female screw hole 8 of the pile head end plate 9 on the lower surface.
た鉄筋定着部3と下面に杭頭端板9のPC鋼棒端部11に
圧着する圧着固定部4と前記杭頭端板9に支圧する支圧
固定部5を設けた頭部6を有しかつ下面に雄ねじ7を設
けた定着具20の該雄ねじ7を、 プレストレストコンクリート杭の杭頭端板9のPC鋼棒
定着部3に近接して設けた雌ねじ孔8に定着具の頭部締
め付けによりねじ込み、接続鉄筋1の引張強度以上の固
着力を発生させ、かつ圧着固定部4でPC鋼棒端部11に
対し下向きの抵抗力を発生させながら雄ねじ7のねじ込
みでPC綱棒端部11に上向きの作用力を発生させて杭頭
端板9に固定し、 その後に前記定着具20に接続鉄筋1を接続しこの接続鉄
筋1を基礎スラブとプレストレストコンクリート杭との
連結筋とすることを特徴とする後付け定着具による杭頭
処理工法。2. Reinforcing bar fixing part 3 having female screw fixing hole 2 of connecting reinforcing bar 1 on the upper surface, crimp fixing part 4 for crimping to PC steel rod end 11 of pile head end plate 9 on the lower surface, and said pile head end plate. 9 has a head portion 6 provided with a bearing fixing portion 5 for bearing a pressure and a male screw 7 of a fixing tool 20 having a male screw 7 on the lower surface thereof is used to fix a PC steel rod fixing portion of a pile head end plate 9 of a prestressed concrete pile. 3 is screwed into the female screw hole 8 provided in the vicinity of 3 by tightening the head of the fixing tool to generate a fixing force equal to or higher than the tensile strength of the connecting rebar 1, and the crimp fixing part 4 is directed downward with respect to the PC steel rod end 11. While the resistance force is being generated, the male screw 7 is screwed in to generate an upward acting force on the PC steel rod end 11 to fix it to the pile head end plate 9, after which the connecting rebar 1 is connected to the fixing tool 20 and this connection is made. Reinforcing bar 1 is used as a connecting bar between the foundation slab and the prestressed concrete pile. Pile processing method by the fixing device with after that.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1140997A JPH0657944B2 (en) | 1989-06-05 | 1989-06-05 | Crimping type post-fixing fixtures for prestressed concrete piles and pile head treatment method using post-fixing fixtures |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1140997A JPH0657944B2 (en) | 1989-06-05 | 1989-06-05 | Crimping type post-fixing fixtures for prestressed concrete piles and pile head treatment method using post-fixing fixtures |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH038923A JPH038923A (en) | 1991-01-16 |
JPH0657944B2 true JPH0657944B2 (en) | 1994-08-03 |
Family
ID=15281759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1140997A Expired - Fee Related JPH0657944B2 (en) | 1989-06-05 | 1989-06-05 | Crimping type post-fixing fixtures for prestressed concrete piles and pile head treatment method using post-fixing fixtures |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0657944B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4258246B2 (en) | 2003-03-28 | 2009-04-30 | 豊田合成株式会社 | Weather strip and manufacturing method thereof |
CN102556874B (en) * | 2011-12-17 | 2015-01-07 | 陈桂晖 | Looseness-preventing rope protection device of steel wire rope used for crane |
DE102014117123A1 (en) * | 2014-11-24 | 2016-05-25 | Cqlt Saargummi Technologies S.À.R.L. | Sealing element with injection molded part |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5140014Y2 (en) * | 1973-02-21 | 1976-09-30 | ||
JPS5854449U (en) * | 1981-10-09 | 1983-04-13 | 服部 易玉 | Foundation pile structure |
-
1989
- 1989-06-05 JP JP1140997A patent/JPH0657944B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH038923A (en) | 1991-01-16 |
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