JPS6225811B2 - - Google Patents
Info
- Publication number
- JPS6225811B2 JPS6225811B2 JP58124674A JP12467483A JPS6225811B2 JP S6225811 B2 JPS6225811 B2 JP S6225811B2 JP 58124674 A JP58124674 A JP 58124674A JP 12467483 A JP12467483 A JP 12467483A JP S6225811 B2 JPS6225811 B2 JP S6225811B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- pile
- steel
- cross
- section
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 239000000463 material Substances 0.000 claims description 27
- 230000002787 reinforcement Effects 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Description
【発明の詳細な説明】
本発明はコンクリートパイルに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to concrete piles.
従来より知られる構造物用基礎杭としては、大
別してコンクリート製のRCパイル、PCパイル、
その外鋼管杭及び鋼管とコンクリートとの複合パ
イルなどがある。コンクリートパイルのうちRC
パイルは製作が容易であると共に、コンクリート
の圧縮力に強いという利点を杭の支持力として有
効に活用できるという理由から古くより大量に利
用されてきた。しかしながらこのRCパイルは支
持力の点で有利である反面曲げに弱くコンクリー
トの表面にひび割れを生じやすいという欠点があ
る。勿論ひび割れが生ずるということは、その部
分から座屈を生じやすくなると共に、地下水の侵
入によつて内部の筋材が腐食し、やがては杭とし
ての機能を失うことになる。 Conventionally known foundation piles for structures can be roughly divided into concrete RC piles, PC piles,
In addition, there are steel pipe piles and composite piles of steel pipes and concrete. RC out of concrete pile
Piles have been used in large quantities for a long time because they are easy to manufacture and the advantage of concrete's high compressive force can be effectively utilized as the supporting force of the pile. However, while this RC pile has an advantage in terms of supporting capacity, it has the disadvantage of being weak against bending and prone to cracks on the concrete surface. Of course, when cracks occur, buckling becomes more likely to occur in those areas, and the internal reinforcement corrodes due to the intrusion of groundwater, eventually causing the pile to lose its function.
このようなRCパイルのひび割れが生じやすい
という欠点を補うために、コンクリートにプレス
トレスを与えるPCパイルがその後提唱されるに
至つたが、PCパイルはひび割れを生じにくいと
いう利点を有する反面、鋼線に緊張力が与えられ
ていて、いわゆる粘性に欠けるために、所定以上
の大きい曲げモーメントが作用するとPC鋼線が
破断して、プレストレスを与えた意味がなくなる
という問題点がある。また、PCパイル以外の方
法によりコンクリートのひび割れを防止するよう
にしたものとしては、杭体の表面に多数の扁平鋼
材を端面が外周面と接するか、または小さい被り
を有するようにして放射状に配列し、これらの扁
平鋼材により杭体表面のひび割れを防止するよう
にしたコンクリート杭も知られている(特公昭52
−49247号)。しかしながらこの杭は、水平荷重に
よる杭体表面のひび割れ耐力を、扁平鋼材の強軸
方向により補強しようとするものであるが、各扁
平鋼材の外端面は杭体表面部付近に殆どむき出し
に近い状態で配列されていて、各鋼材間の連結関
係が弱いために、垂直荷重に対しては扁平鋼材が
弱軸方向に簡単に折れ曲がつてしまつて、コンク
リートと鋼材との付着性が欠け、容易にひび割れ
を生じてしまうという欠陥を有している。 In order to compensate for the disadvantage of RC piles, which tend to crack easily, PC piles, which apply prestress to concrete, were later proposed. However, while PC piles have the advantage of being less prone to cracking, steel wire There is a problem in that the prestress is applied to the prestressed wire, and since it lacks so-called viscosity, the prestressed wire will break if a bending moment larger than a predetermined value is applied, rendering the prestressing point meaningless. In addition, as a method other than PC piles to prevent concrete cracking, a large number of flat steel members are arranged radially on the surface of the pile body so that the end surface touches the outer circumferential surface or has a small overlap. However, concrete piles that use these flat steel materials to prevent cracks on the surface of the pile body are also known (Special Public Interest Publication in 1977).
−49247). However, although this pile is intended to strengthen the crack resistance of the pile body surface due to horizontal loads by using the strong axis direction of the flat steel members, the outer end surface of each flat steel member is almost exposed near the pile body surface. Because the connection between the steel members is weak, the flat steel members easily bend in the direction of the weak axis under vertical loads, resulting in poor adhesion between the concrete and the steel members, and the connection between the steel members is weak. It has the defect of causing cracks.
本発明は上記の如きRCパイル及びRCパイルの
問題点を解消できる新しい型式のコンクリートパ
イルの提供を目的としたものである。 The object of the present invention is to provide an RC pile and a new type of concrete pile that can solve the problems of RC piles as described above.
この発明に係るコンクリートパイルは、基本的
にはPCパイルの型式によるが、PC鋼材以外にパ
イルとしての粘性を充分に発揮させるためのコン
クリート補強筋材として、従来のコンクリートパ
イルにおける軸筋材のように単にコンクリートの
引つ張り力を補償するという意味のものとは異つ
た、パイルの機能として要求される水平耐力が充
分に得られるような特殊な型鋼材を用いることを
目的としている。 The concrete pile according to the present invention basically depends on the type of PC pile, but in addition to the PC steel material, it can be used as a concrete reinforcing reinforcement material to fully exhibit the viscosity of the pile, like the shaft reinforcement material in conventional concrete piles. The purpose of this project is to use a special type of steel that can sufficiently provide the horizontal bearing capacity required as a function of the pile, rather than simply compensating for the tensile force of the concrete.
次に本発明のコンクリートパイルを図示の実施
例により説明する。第1図は杭体断面の構成を示
す断面図であり、コンクリートをもつて遠心成形
した杭体1のコンクリート層3断面内に、多数の
レール型断面の型鋼材2が杭軸方向に沿つた筋材
として所定間隔毎に配列されている。これらの型
鋼材2は、従来のコンクリートパイルにおける丸
棒軸鉄筋と異り、第2図a,b,cに示すように
夫々頂端4が底端5に比較して板幅W方向に肉厚
tとなつた、板幅Wが板厚Hよりも大きい縦長の
レール型断面のものが用いられている。またこの
型鋼材2は、夫々コンクリート層3断面内におい
て肉厚の頂端4がコンクリート層3の外周側に位
置するような向きで、頂端4と底端5とを結ぶ中
心線Lが夫々杭断面の半径方向と平行な向き、即
ち全体的にみて杭の中心に対して放射線状になる
ように配列されている。なお型鋼材2は頂端4を
外周側に位置する向きで配列した方が望ましいた
めに、第2図に示すように夫々の型鋼材2におけ
る頂端4の先端面は円弧状に形成されている。そ
の理由は遠心力によりコンクリート層3が締固め
られる際に、杭断面の中心からみて頂端4の裏側
にコンクリートの未充填部分が生じないようにす
るためと、後述の螺旋筋8と接するのに都合がよ
いようにするためである。 Next, the concrete pile of the present invention will be explained with reference to illustrated embodiments. Figure 1 is a cross-sectional view showing the structure of a pile body, in which a large number of shaped steel members 2 with rail-shaped cross sections are arranged along the axial direction of the pile within the cross section of the concrete layer 3 of the pile body 1 which is centrifugally formed with concrete. They are arranged as reinforcement at predetermined intervals. These shaped steel members 2 differ from the round rod shaft reinforcing bars in conventional concrete piles, as shown in Fig. 2 a, b, and c, the top ends 4 are thicker in the plate width W direction than the bottom ends 5, respectively. A vertically elongated rail-shaped cross section with a plate width W larger than the plate thickness H is used. In addition, the shaped steel members 2 are oriented so that the thick top ends 4 are located on the outer circumferential side of the concrete layer 3 in the cross section of the concrete layer 3, and the center line L connecting the top end 4 and the bottom end 5 is oriented so that the center line L connecting the top end 4 and the bottom end 5 is located in the cross section of the concrete layer 3. The piles are arranged in a direction parallel to the radial direction of the pile, that is, in a radial direction with respect to the center of the pile as a whole. Since it is preferable that the shaped steel materials 2 are arranged with the apex 4 located on the outer circumferential side, the tip end surface of the apex 4 of each shaped steel material 2 is formed in an arc shape as shown in FIG. 2. The reason for this is to prevent an unfilled part of concrete from forming on the back side of the top end 4 when viewed from the center of the pile cross section when the concrete layer 3 is compacted by centrifugal force, and to avoid contact with the spiral reinforcement 8 described later. This is to make it convenient.
これらの型鋼材2は第3図に示すように、夫々
杭の両端における固定端板6によつて上記の如き
放射形配列状態が維持されるように互いに固定さ
れる。更に第1図に示すように型鋼材2の配列に
際しては、夫々の型鋼材2の間にPC鋼材7が
夫々配列されるようにして型鋼材2とPC鋼材7
の外側に螺旋筋8が巻装され、各型鋼材2の頂端
4がこの螺旋筋8によつてしつかりと保持固定さ
れて、杭体断面のコンクリート層3内部充分に包
み込まれるようにして配筋される。 As shown in FIG. 3, these shaped steel members 2 are fixed to each other by fixed end plates 6 at both ends of the piles so that the above-mentioned radial arrangement is maintained. Furthermore, as shown in FIG. 1, when arranging the shaped steel materials 2, the prestressed steel materials 7 are arranged between the respective shaped steel materials 2, so that the shaped steel materials 2 and the prestressed steel materials 7 are arranged.
A spiral reinforcement 8 is wrapped around the outside of the pile body, and the top end 4 of each shaped steel member 2 is firmly held and fixed by the spiral reinforcement 8, and is arranged so as to be fully wrapped inside the concrete layer 3 of the cross section of the pile body. It's streaky.
本発明に係るコンクリートパイルは、上記の如
くコンクリート杭体1のコンクリート層3断面内
に多数のレール型断面の型鋼材2をその中心線L
が夫々杭断面の半径方向と平行な向きで互いに間
隔を置いて配列させたので、第1図に示すように
矢印の方向から水平力が作用した場合に、水平力
の方向と平行な向きにある部分の型鋼材2a及び
2bが特にその水平力に対して抵抗することとな
る。この場合前記型鋼材2a及び2bは、断面が
中心線Lに沿つた縦長であることと、実施例の如
く頂部4をコンクリート層3の外周側に位置させ
た場合には、頂端4が板厚方向の肉厚tを有する
ので断面としてみた場合の中立軸Pが中心線L上
の外側、即ちコンクリート層3の外周側に位置す
ることとによつて、前記水平力に対しては著しく
強靭な抵抗力を発揮することとなる。また夫々の
型鋼材2は、幅のある底端5を有しているため、
前記の水平力が作用した場合に該水平力に対して
直接抵抗する型鋼材2a,2bのみならず、例え
ば水平力と直行する向きの型鋼材2c,2dであ
つても底端5が該水平力に対して抵抗することと
なり、全ての型鋼材2がその特殊な断面形状に基
いて杭全体として強力な曲げ強度と弾性を発揮す
ることができる。 As described above, the concrete pile according to the present invention has a large number of shaped steel members 2 each having a rail-shaped cross section within the cross section of the concrete layer 3 of the concrete pile body 1 along its center line L.
are arranged at intervals parallel to the radial direction of the pile cross section, so when a horizontal force is applied from the direction of the arrow as shown in Figure 1, the Certain sections of the steel sections 2a and 2b will particularly resist the horizontal force. In this case, the cross section of the shaped steel members 2a and 2b is longitudinally elongated along the center line L, and when the top portion 4 is located on the outer peripheral side of the concrete layer 3 as in the example, the top portion 4 has a plate thickness. Since it has a wall thickness t in the direction, the neutral axis P when viewed as a cross section is located on the outside of the center line L, that is, on the outer peripheral side of the concrete layer 3, so that it is extremely strong against the horizontal force. This will demonstrate resistance. In addition, since each shaped steel material 2 has a wide bottom end 5,
When the horizontal force is applied, not only the steel shapes 2a and 2b that directly resist the horizontal force, but also the steel shapes 2c and 2d that are oriented perpendicular to the horizontal force have their bottom ends 5 aligned with the horizontal force. This results in resistance to force, and the pile as a whole can exhibit strong bending strength and elasticity based on the special cross-sectional shape of all the shaped steel members 2.
また、このコンクリートパイルは、レール型断
面の型鋼材2の間に配置したPC鋼材7によりコ
ンクリートにプレストレスが導入されるが、各型
鋼材2は頂端4が螺旋筋8によつて、その放射状
配列状態を保持固定されているので、型鋼材2間
のコンクリートにプレストレスが導入されても、
各型鋼材2の放射状配列状態が変形することがな
い。 In addition, in this concrete pile, prestress is introduced into the concrete by the PC steel material 7 placed between the shape steel materials 2 with a rail-shaped cross section, but the top end 4 of each shape steel material 2 is Since the arrangement is maintained and fixed, even if prestress is introduced into the concrete between the two shaped steel members,
The radial arrangement state of each type steel material 2 is not deformed.
また、各型鋼材2間のコンクリートにプレスト
レスによる圧密作用が与えられることによつて、
この型鋼材2間のコンクリートは杭軸方向のみな
らず、夫々の型鋼材2の側面方向に対する水平方
向にも圧密作用が与えられることとなり、このコ
ンクリートの圧密作用によつて各型鋼材2の放射
状配列状態が一層強固なものとなる。 In addition, by applying a consolidation effect due to prestress to the concrete between each type steel 2,
The concrete between the steel shapes 2 is consolidated not only in the axial direction of the pile but also in the horizontal direction with respect to the side surfaces of each steel shape 2, and due to the consolidation action of the concrete, the radial shape of each steel shape 2 is The alignment becomes even stronger.
更に、各型鋼材2間のコンクリート層がプレス
トレスによる圧密作用を受けることにより、コン
クリート層と各型鋼材とは化学的付着力のみなら
ず物理的付着力が付加されることとなり、このプ
レストレス導入によつて表面のひび割れ防止効果
を確実なものとすることができる。従つて、この
コンクリートパイルでは、前記のようなプレスト
レスの導入状態が、前記型鋼材2により付与され
る杭体としての粘性と合成されて、従来の単なる
PCパイルに比較して、杭としての強靭性を大幅
向上させることができるという利点を有する。 Furthermore, as the concrete layer between each type steel material 2 is subjected to the consolidation effect due to prestress, not only chemical adhesion force but also physical adhesion force is added between the concrete layer and each type steel material, and this prestress By introducing this, the effect of preventing cracks on the surface can be ensured. Therefore, in this concrete pile, the prestress introduced state as described above is combined with the viscosity as a pile body imparted by the shaped steel material 2, and the conventional simple
Compared to PC piles, it has the advantage of significantly improving the toughness of piles.
第1図は本発明に係るコンクリートパイルの杭
断面の構成を示す断面図、第2図a,b,cはい
ずれも本発明のパイルにおける軸筋材として使用
される型鋼材の断面図、第3図は第1図の―
における断面図である。図において、
1:杭体、2:型鋼材、3:コンクリート層、
4:型鋼材頂端、5:型鋼材底端、6:固定端、
7:PC鋼材、8:螺旋筋。
Fig. 1 is a cross-sectional view showing the structure of the pile cross-section of a concrete pile according to the present invention, and Fig. 2 a, b, and c are all cross-sectional views of shaped steel used as shaft reinforcement in the pile of the present invention. Figure 3 is the same as in Figure 1.
FIG. In the figure, 1: pile body, 2: steel shape material, 3: concrete layer,
4: Top end of mold steel material, 5: Bottom end of mold steel material, 6: Fixed end,
7: PC steel material, 8: Spiral bar.
Claims (1)
型鋼材を、頂端と底端とを結ぶ中心線が夫々杭断
面の半径方向を平行する向きで、かつ頂端がコン
クリート層内の外周側に位置するような向きで互
いに間隔を置いて配列して、これらの各型鋼材の
頂端を螺旋筋により前記の配列状態が固定される
ように結束し、これらの各型鋼材が軸方向主筋材
として杭体断面のコンクリート内部に包み込まれ
るように配置すると共に、杭両端における前記型
鋼材の固定端板間に定着されるPC鋼材を前記各
型鋼材間の中間部に配置して、該PC鋼材により
杭体コンクリートにプレストレスを与えたことを
特徴とするコンクリートパイル。1 A large number of shaped steel members with a rail-shaped cross section with a thick top end are oriented so that the center line connecting the top end and the bottom end is parallel to the radial direction of the pile cross section, and the top end is on the outer peripheral side within the concrete layer. The top ends of each of these steel shapes are tied together with spiral reinforcement so that the above-mentioned arrangement is fixed, and each of these steel shapes serves as the main reinforcement in the axial direction. A PC steel material is placed so as to be wrapped inside the concrete of the cross section of the pile body, and a PC steel material that is fixed between the fixed end plates of the shape steel materials at both ends of the pile is placed in the intermediate part between each of the shape steel materials. A concrete pile characterized by applying prestress to the pile concrete.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12467483A JPS6019817A (en) | 1983-07-11 | 1983-07-11 | Concrete pile |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12467483A JPS6019817A (en) | 1983-07-11 | 1983-07-11 | Concrete pile |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6019817A JPS6019817A (en) | 1985-02-01 |
JPS6225811B2 true JPS6225811B2 (en) | 1987-06-04 |
Family
ID=14891251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12467483A Granted JPS6019817A (en) | 1983-07-11 | 1983-07-11 | Concrete pile |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6019817A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5249247A (en) * | 1975-10-17 | 1977-04-20 | Nippon Oil & Fats Co Ltd | Vertical type continuous powder coating booth |
-
1983
- 1983-07-11 JP JP12467483A patent/JPS6019817A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5249247A (en) * | 1975-10-17 | 1977-04-20 | Nippon Oil & Fats Co Ltd | Vertical type continuous powder coating booth |
Also Published As
Publication number | Publication date |
---|---|
JPS6019817A (en) | 1985-02-01 |
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