JPH0517938A - Centrifugal force molded concrete pile body - Google Patents
Centrifugal force molded concrete pile bodyInfo
- Publication number
- JPH0517938A JPH0517938A JP17119791A JP17119791A JPH0517938A JP H0517938 A JPH0517938 A JP H0517938A JP 17119791 A JP17119791 A JP 17119791A JP 17119791 A JP17119791 A JP 17119791A JP H0517938 A JPH0517938 A JP H0517938A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- pile
- pile body
- head part
- concrete pile
- 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.)
- Withdrawn
Links
Landscapes
- Piles And Underground Anchors (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、杭施行中、打撃による
杭頭部への縦クラック発生防止に優れた杭体を提供する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a pile body which is excellent in preventing vertical cracks from being generated on the pile head due to impact during pile operation.
【０００２】[0002]
【従来の技術】従来から、コンクリート杭体は、コンク
リートとのものが脆性材料であるため、施工時等の衝撃
強度を高めるために、継手金具の側部環状板に溝を設け
たり、側部環状板を長くしたり、また、鋼繊維を混入し
たコンクリートを用いてコンクリート杭体を作製したり
する工夫がなされていた。2. Description of the Related Art Conventionally, since concrete piles and concrete are brittle materials, in order to increase impact strength at the time of construction, the side annular plates of joint fittings are provided with grooves or side portions. It has been devised to lengthen the annular plate and to manufacture concrete piles using concrete mixed with steel fibers.
【０００３】特に、杭頭部は、打ち込みを行う際、打撃
により縦クラックを生じやすいので、特開昭５４−５６
２１１号公報のように、コンクリートの頭部のみに鋼繊
維を混入しているものもある。In particular, since the pile head is apt to cause a vertical crack upon impact when driving, a pile head is disclosed in JP-A-54-56.
In some cases, as disclosed in Japanese Patent No. 211, steel fibers are mixed only in the concrete head.
【０００４】[0004]
【発明が解決しようとする課題】しかし、（継手金具を
補強するより、コンクリート自体を補強する方が好まし
く、また、）鋼繊維をコンクリート中に混入すると、鋼
繊維間の摩擦が大きいことから、鋼繊維同士が凝集して
ファイバーボウルが形成され、杭体中に鋼繊維が不均一
に存在することとなる。そのため、補強材としての鋼繊
維は、コンクリート容積に対して、最大２％程度までし
か混入できず、耐力の補強効果は十分とはいえなかっ
た。However, when the steel fibers are mixed into the concrete (it is preferable to reinforce the concrete itself rather than to reinforce the joint metal fittings), since the friction between the steel fibers is large, The steel fibers are aggregated to form a fiber bowl, and the steel fibers are unevenly present in the pile body. Therefore, steel fibers as a reinforcing material can be mixed in only up to about 2% with respect to the concrete volume, and the reinforcing effect of the proof stress cannot be said to be sufficient.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記問題点を
解決するために、コンクリート杭体の少なくとも頭部
に、曲面部を１つ以上持つ鉄片が含まれたコンクリート
の層を有する遠心力成形コンクリート製品に関するもの
である。本発明でいうコンクリートは、通常杭体を製造
するのに使われているものでよく、その配合率は杭の使
用用途により適宜変えうる。増強するために、鉄片を混
入する際も、同じコンクリートを用いる。In order to solve the above problems, the present invention has a centrifugal force having a concrete layer containing an iron piece having at least one curved surface portion on at least the head of a concrete pile. It concerns molded concrete products. The concrete referred to in the present invention may be one that is usually used for manufacturing piles, and the mixing ratio thereof can be appropriately changed depending on the intended use of the pile. The same concrete is used when adding iron pieces for reinforcement.
【０００６】ここでいう鉄片は補強材として混入される
もので、その材質は特に限定されないが、主に鉄鋼を用
いることが望ましい。形状としては、凝集を防ぐために
鋼繊維よりも接触面積の大きい板状にし、寸法は製品の
仕様により適宜選択することができるが、平面換算で幅
は１．０〜２．０ｍ／ｍ、長さは２０〜４０ｍ／ｍ、厚
さは０．１〜０．５ｍ／ｍが適当である。The iron piece referred to here is mixed as a reinforcing material, and its material is not particularly limited, but it is preferable to mainly use steel. As the shape, in order to prevent agglomeration, a plate shape having a contact area larger than that of steel fiber is used, and the dimension can be appropriately selected according to the specifications of the product, but in terms of plane, the width is 1.0 to 2.0 m / m, and the length is It is suitable that the length is 20 to 40 m / m and the thickness is 0.1 to 0.5 m / m.
【０００７】さらに前記鉄片に剛性をもたせるために、
たとえば図２〜図５に示すように鉄片を曲折させる。こ
の曲げ方にはＶ字形等折り目をつける方法と、孤状に
折り目をつけない方法とがある。方法によれば、コ
ンクリート杭体に傷がつきにくく、充填する際、す
（鬆）ができにくいのでの方法が好ましい。この場
合、鉄片に剛性を持たせるためには二以上の曲面部を有
するものが好ましく曲面は多い程効果的である。Further, in order to give the iron piece rigidity,
For example, the iron piece is bent as shown in FIGS. This bending method includes a method of making a crease such as a V shape and a method of not making a crease in an arc shape. According to the method, the concrete pile is less likely to be scratched, and a void (porosity) is less likely to occur when the concrete pile is filled. In this case, in order to give the iron piece rigidity, it is preferable that the iron piece has two or more curved surface portions, and the more curved surfaces the more effective.
【０００８】本発明においては、杭体全体を上記鉄片を
混入したコンクリートて成形したものでもよいが、少な
くとも杭頭部に鉄片を混入したコンクリートを使用すれ
ば、十分衝撃強度に耐えうる。なお、本発明でいう杭頭
部とは、杭の長さの１／５〜１／３程度である。また、
混入する量は、最大１０％前後まで混入することができ
る。In the present invention, the whole pile body may be formed by molding concrete containing the iron pieces, but at least impact strength can be endured by using concrete containing iron pieces in the pile heads. The pile head in the present invention is about 1/5 to 1/3 of the length of the pile. Also,
The mixed amount can be up to about 10%.
【０００９】本発明の杭体は、たとえば次のようにして
製造しうる。前記鉄片を含むコンクリートと、無添加の
コンクリートは、いずれも注入ポンプ利用し、予め、補
強材の取りつけられた型枠に型枠を回転させながら各々
を型枠の両端から注入する。注入後、遠心力成型機によ
り成形を行ない、半養生、本養生を経ることによって製
造される。The pile body of the present invention can be manufactured, for example, as follows. The concrete containing the iron pieces and the concrete without addition are both injected from both ends of the form using a pouring pump while rotating the form in advance to the form fitted with the reinforcing material. After the injection, it is molded by a centrifugal molding machine, and is manufactured by undergoing semi-curing and main curing.
【００１０】[0010]
【実施例】以下に図面を用いて本発明を説明する。図１
は本発明による、実施例を示すものであり、左側が杭頭
部となる部分である。本実施例では杭頭部のみに、鉄片
コンクリートを含有させた。図中１は、遠心力成形機の
概略縦断面図であり、２は型枠、３は型枠内の両側に配
置された継手金具、４は補強鉄筋、５はコンクリート供
給装置（注入ポンプ）、６は鉄片入りコンクリート供給
装置（注入ポンプ）、７は、コンクリート供給装置に連
設した圧送管、８は、同圧送用シリンダ、９は鉄片入り
コンクリート供給装置に連設した圧送管、１０は同圧送
用シリンダを各々示している。The present invention will be described below with reference to the drawings. Figure 1
Shows an embodiment according to the present invention, in which the left side is the head portion of the pile. In this example, shingles concrete was contained only in the pile head. In the figure, 1 is a schematic vertical cross-sectional view of a centrifugal molding machine, 2 is a formwork, 3 is joint fittings arranged on both sides of the formwork, 4 is a reinforcing bar, and 5 is a concrete supply device (injection pump). , 6 is an iron piece-containing concrete supply device (injection pump), 7 is a pressure feed pipe connected to the concrete supply device, 8 is the same pressure supply cylinder, 9 is a pressure feed pipe connected to the iron piece containing concrete supply device, 10 is The same pressure feeding cylinders are shown.
【００１１】コンクリート供給装置５、６に注入するコ
ンクリートは、セメント：細粗骨材：水＝１部：５部：
０．４部の配合のものを利用した。また、コンクリート
供給装置６に添加する鉄片は、ヤング率２×１０6 ｋｇ
／ｃｍ2 、厚み０．２ｍｍの鋼を用いた。また、その形
状は図４のように、曲面部を３つ持つものであり、幅は
平面換算で１．５ｍｍ、長さ３０ｍｍになるように成形
した。混入量は杭頭部を成すコンクリートの総体積の５
％とした。The concrete to be poured into the concrete supply devices 5 and 6 is cement: fine coarse aggregate: water = 1 part: 5 parts:
A 0.4 part formulation was utilized. The iron piece added to the concrete supply device 6 has a Young's modulus of 2 × 10 6 kg.
Steel having a thickness of 0.2 mm / cm 2 was used. Further, as shown in FIG. 4, the shape thereof has three curved surface portions, and the width was 1.5 mm and the length was 30 mm when converted into a plane. The amount of mixing is 5 of the total volume of concrete forming the pile head.
%.
【００１２】まず、遠心力成形機１内に型枠２を横にし
て設置する、型枠２内には前もって、型枠２の両側に継
手金具３とその２つの継手金具３を連設している補強鉄
筋４が配置されている。次に、型枠２を、モーター１１
およびそのモーター１１に連動する駆動部１２によっ
て、回転させながら、圧送管８，９を介してコンクリー
ト供給装置５と鉄片入りコンクリート供給装置６から、
各々コンクリートと鉄片入りコンクリートを型枠２の両
側から同時に投入した。この際、後者の鉄片入りコンク
リートは、継手金具３の端面より約２０００ｍ／ｍまで
注入した。First, the mold 2 is installed sideways in the centrifugal molding machine 1. In the mold 2, the fittings 3 and the two fittings 3 are continuously provided on both sides of the mold 2 in advance. Reinforcing reinforcing bars 4 are arranged. Next, the mold 2 is attached to the motor 11
And a driving unit 12 that works in conjunction with the motor 11 while rotating the concrete feeding device 5 and the iron-filled concrete feeding device 6 via the pressure-feeding pipes 8 and 9,
Each of the concrete and the concrete containing iron pieces was simultaneously poured from both sides of the formwork 2. At this time, the latter concrete containing iron pieces was poured up to about 2000 m / m from the end surface of the joint fitting 3.
【００１３】次いで、型枠２にモーター１１とそのモー
ター１１に連動する駆動部１２によって、型枠２に遠心
力（最終締固め時３０Ｇ）をかけて成形する。その後、
型枠２のまま予備養生室で養生後、型枠２から内部の半
硬化コンクリート杭体を脱型し１８０℃で１０時間、本
養生を行うことにより、外径３０ｃｍ、肉厚６ｃｍ、長
さ１０ｍの遠心成形コンクリート杭体を得た。Next, the mold 2 is molded by applying a centrifugal force (30 G at the time of final compaction) to the mold 2 by the motor 11 and the drive unit 12 which is interlocked with the motor 11. afterwards,
After curing in the preliminary curing room with the mold 2 as it is, the semi-hardened concrete pile inside is removed from the mold 2 and the main curing is performed at 180 ° C. for 10 hours to obtain an outer diameter of 30 cm, a wall thickness of 6 cm, and a length. A 10 m centrifugally molded concrete pile was obtained.
【００１４】この杭体について縦クラックが生ずるまで
の累積打撃回数について、従来の杭体と比較を行ったと
ころ、本発明のコンクリート杭体は、従来のものに対し
て累積打数が３０％増加した。When the cumulative number of hits until vertical cracks were generated in this pile body was compared with that of the conventional pile body, the concrete pile body of the present invention showed a 30% increase in the cumulative number of strikes as compared with the conventional pile body. .
【００１５】[0015]
【発明の効果】以上のような構成することにより、コン
クリート中に、繊維材を使用する時よりも多くの補強材
を混入することができ、増強された杭を提供することが
できる。また、少なくとも杭の頭部を増強することによ
って、杭頭部が打撃に耐える力が大きくなり、打撃回数
を多く必要とする施行条件にも適する。また杭の継手金
具の平坦度不良、施行中の偏打にも耐えうるものにな
る。With the above-mentioned structure, it is possible to mix more reinforcing material into the concrete than in the case of using the fiber material, and it is possible to provide an enhanced pile. Further, by strengthening at least the head portion of the pile, the strength of the head portion of the pile to withstand the impact becomes large, which is suitable for the enforcement condition that requires a large number of impacts. Moreover, the flatness of the joint fittings of the piles can be withstood and the uneven mounting during operation can be endured.
【図１】実施例に用いる遠心成形機を示す。FIG. 1 shows a centrifugal molding machine used in Examples.
【図２】本発明の杭体に混入する鉄片例FIG. 2 is an example of an iron piece mixed in the pile body of the present invention.
【図３】本発明の杭体に混入する鉄片例FIG. 3 is an example of an iron piece mixed in the pile body of the present invention.
【図４】本発明の杭体に混入する鉄片例FIG. 4 is an example of an iron piece mixed in the pile body of the present invention.
【図５】本発明の杭体に混入する鉄片例FIG. 5 is an example of an iron piece mixed in the pile body of the present invention.
【図６】実施例による遠心力成形コンクリート杭体の一
部切り欠き断面図である。FIG. 6 is a partially cutaway sectional view of a centrifugal force-formed concrete pile body according to an embodiment.
１ 遠心力成形機 ２ 型枠 ３ 継手金具 ４ 補強鉄筋 ５ コンクリート供給装置 ６ 鉄片入りコンクリート供給装置 ７ コンクリート供給装置に連結した圧送管 ８ コンクリート供給装置に連結した圧送用シリンダ ９ 鉄片入りコンクリート供給装置に連結した圧送管 １０ 鉄片入りコンクリート供給装置に連結した圧送用
シリンダ １１ モーター １２ 駆動部 １３ 鉄片入りコンクリート部1 Centrifugal forming machine 2 Formwork 3 Joint fitting 4 Reinforcing steel bar 5 Concrete feeding device 6 Iron-filled concrete feeding device 7 Pressure feed pipe connected to concrete feeding device 8 Cylinder for pressure feeding linked to concrete feeding device 9 Iron-filled concrete feeding device Connected pressure feeding pipe 10 Iron feeding concrete feeding cylinder connected to feeding device 11 Motor 12 Drive part 13 Iron feeding concrete part
Claims (1)
曲面部を１つ以上持つ鉄片が含まれたコンクリートの層
を有する遠心力成形コンクリート杭体Claims: 1. At least the head of a concrete pile body,
Centrifugal force-formed concrete pile with a layer of concrete containing iron pieces with one or more curved parts
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17119791A JPH0517938A (en) | 1991-07-11 | 1991-07-11 | Centrifugal force molded concrete pile body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17119791A JPH0517938A (en) | 1991-07-11 | 1991-07-11 | Centrifugal force molded concrete pile body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0517938A true JPH0517938A (en) | 1993-01-26 |
Family
ID=15918817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17119791A Withdrawn JPH0517938A (en) | 1991-07-11 | 1991-07-11 | Centrifugal force molded concrete pile body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0517938A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106855A (en) * | 2021-04-20 | 2021-07-13 | 樊涛 | Bridge support building and pouring forming equipment and method |
-
1991
- 1991-07-11 JP JP17119791A patent/JPH0517938A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106855A (en) * | 2021-04-20 | 2021-07-13 | 樊涛 | Bridge support building and pouring forming equipment and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981008 |