JPH0338266Y2 - - Google Patents

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Publication number
JPH0338266Y2
JPH0338266Y2 JP11848586U JP11848586U JPH0338266Y2 JP H0338266 Y2 JPH0338266 Y2 JP H0338266Y2 JP 11848586 U JP11848586 U JP 11848586U JP 11848586 U JP11848586 U JP 11848586U JP H0338266 Y2 JPH0338266 Y2 JP H0338266Y2
Authority
JP
Japan
Prior art keywords
pile
spiral
pile body
spiral blades
screw
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
Application number
JP11848586U
Other languages
Japanese (ja)
Other versions
JPS6327553U (en
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Filing date
Publication date
Application filed filed Critical
Priority to JP11848586U priority Critical patent/JPH0338266Y2/ja
Publication of JPS6327553U publication Critical patent/JPS6327553U/ja
Application granted granted Critical
Publication of JPH0338266Y2 publication Critical patent/JPH0338266Y2/ja
Expired legal-status Critical Current

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Description

【考案の詳細な説明】 「産業上の利用分野」 本考案は、例えば構造物の基礎を構築する際、
地盤補強の目的などから地中にねじ込む、ねじ状
杭の改良に関するものである。
[Detailed description of the invention] "Industrial application field" This invention is suitable for, for example, when constructing the foundation of a structure.
This relates to the improvement of threaded piles that are screwed into the ground for the purpose of ground reinforcement.

「従来の技術およびその問題点」 ねじ状杭は、騒音防止や作業性などの点から、
近年多く使用されており、その種類も従来公知の
鋼製の他に鉄筋コンクリート製のものまで出現し
ている。従来、このようなねじ状杭は、先端が先
細りの杭本体の外周にその半径方向外方に突出し
かつ杭本体の長手方向に沿つて螺旋状に連続して
延びる螺旋羽根(螺旋鍔)を設けたもので、回転
伝達機等を利用して杭本体に回転トルクを与える
ことにより地中にねじ込む構造となつている。
"Conventional technology and its problems" Threaded piles have been developed from the viewpoint of noise prevention and workability.
In recent years, many types have been used, and in addition to the conventionally known steel construction, there are also reinforced concrete construction. Conventionally, such screw-shaped piles have spiral blades (spiral collars) that protrude radially outward and extend continuously in a spiral shape along the longitudinal direction of the pile body on the outer periphery of the pile body with a tapered tip. The structure is such that it is screwed into the ground by applying rotational torque to the pile body using a rotation transmitter or the like.

ところが、このような従来のねじ状杭にあつて
は、杭本体に推力を与える螺旋羽根が、杭本体の
長手方向に沿つて螺旋状に連続して設けられた構
造となつているため、杭をねじ込む土質等によつ
ては、螺旋羽根の間に土が圧着した状態となる場
合があり、このような際に、螺旋羽根のねじ谷部
に土が付着して、ねじとしての効果が落ち推力が
減少してしまい、場合によつては、杭に付着した
土と地盤との間で完全に縁が切れ、ねじとしての
効果がさらに減少してねじ込み不可能となる問題
があつた。
However, in the case of such conventional screw-shaped piles, the spiral blades that apply thrust to the pile body are continuously provided in a spiral shape along the longitudinal direction of the pile body, so the pile Depending on the nature of the soil in which the screw is screwed, soil may become stuck between the spiral blades, and in such cases, soil may adhere to the screw root of the spiral blade, reducing its effectiveness as a screw. The thrust force was reduced, and in some cases, the edge between the soil attached to the pile and the ground was completely severed, further reducing its effectiveness as a screw, making it impossible to screw in.

第8図はこのような杭の一構造例を示すもので
ある(実開昭49−92607号公報)。これは先端が先
細りの杭本体10の外周に杭の推進突条11をあ
る間隔をあけて設け、これら推進突条11の間に
小石等を逃すための逃がし溝12を形成したもの
で、回転伝達機構を利用して杭本体10に回転ト
ルクを与えることにより地中にねじ込む構造とな
つている。
FIG. 8 shows an example of the structure of such a pile (Japanese Utility Model Publication No. 49-92607). This is a pile with driving ridges 11 provided at certain intervals on the outer periphery of a pile main body 10 with a tapered tip, and relief grooves 12 for letting pebbles and the like escape between these driving ridges 11. The structure is such that the pile body 10 is screwed into the ground by applying rotational torque to the pile body 10 using a transmission mechanism.

しかしながら、このような構造のねじ状杭にあ
つても、連続した推進突条11に単に小石等を排
出する逃がし溝12を設けた構造であるので、土
の圧着を防止することができなかつた。
However, even with a threaded pile having such a structure, it is not possible to prevent soil from being crimped because the continuous protrusion ridge 11 is simply provided with a relief groove 12 for discharging small stones, etc. .

「問題点を解決するための手段」 そこで、本考案では、先端が先細りの杭本体の
外周面に、杭本体の半径方向外方に突出しかつ周
方向に延びるに従い下降する形態の螺旋羽根が杭
本体の長手方向に沿つて螺旋状に規則的かつ断続
して設けられたねじ状杭であつて、前記螺旋羽根
は、螺旋羽根の並ぶ螺旋の軌跡に沿つて螺進方向
に240゜、270゜もしくは288゜毎に杭本体の外周を回
つた位置に突設され、かつ、各螺旋羽根は隣合う
螺旋羽根の翼端が互いにラツプしない翼幅に設定
された構成としたものである。
``Means for Solving the Problems'' Therefore, in the present invention, a spiral blade is provided on the outer circumferential surface of the pile body with a tapered tip that protrudes outward in the radial direction of the pile body and descends as it extends in the circumferential direction. It is a threaded pile provided regularly and intermittently in a spiral along the longitudinal direction of the main body, and the spiral blades are arranged at 240° and 270° in the spiral direction along the spiral locus of the spiral blades. Alternatively, the spiral blades are protruded around the outer periphery of the pile body every 288 degrees, and each spiral blade is configured to have a wingspan such that the wing tips of adjacent spiral blades do not overlap each other.

「作用」 前記構成のねじ状杭によれば、杭本体に回転力
を与えてねじ込むと、各螺旋羽根の螺進側先端が
周方向に存在する地山を杭本体の回転とともに切
つて杭の貫入力を向上させ、また、各螺旋羽根の
見掛けのピツチが螺旋羽根の並ぶ螺旋のピツチに
対して2倍以上になる。さらに、リードアングル
が小さいので推進力が得られる状態でねじ山の間
隔が広がるので、土による圧着を軽減することが
できるとともに、それぞれの螺旋羽根の螺進側端
が土をきるので、この結果、杭自体の推進力の低
下を防止することができる。
"Operation" According to the screw-shaped pile having the above configuration, when the pile body is screwed by applying a rotational force, the spiral side tips of each spiral blade cut the ground existing in the circumferential direction as the pile body rotates, and the pile body is rotated. The penetration force is improved, and the apparent pitch of each spiral blade is more than twice the pitch of the spirals in which the spiral blades are arranged. Furthermore, since the lead angle is small, the spacing between the threads is widened while propulsive force is obtained, reducing the pressure caused by soil, and the spiral end of each spiral blade cuts through the soil. , it is possible to prevent a decrease in the driving force of the pile itself.

「実施例」 以下、本考案の実施例を図面を参照して説明す
る。第1図ないし第3図は本考案を鉄筋コンクリ
ート製のねじ状杭に適用した第1実施例を示すも
ので、これらの図において、符号1は先端が先細
り状に形成された杭本体であり、この杭本体1の
外周面には、螺旋羽根2が、杭本体1の長手方向
に沿つて螺旋状に規則的かつ断続して、杭本体1
の長さのほぼ全体にわたつて形成されている。こ
の螺旋羽根2は、杭本体1の長手方向に沿つて延
びる螺旋状のねじの一部を構成するもので、本考
案ではこのねじが連続して延びる螺旋羽根ではな
く、規則的に断続する間欠螺旋羽根とされてい
る。すなわち、この螺旋羽根2は、杭本体1の半
径方向外方に突出しかつ周方向に延びるに従い下
降する形態に形成されており、また、これら螺旋
羽根2は、第2図に示す如く、螺旋羽根2の並ぶ
螺旋の軌跡に沿つて螺進方向に240゜毎に杭本体1
の外周を回つた位置にそれぞれ突設され、全体と
して一枚置きに螺旋羽根2が突設された3枚羽根
の杭を構成している。なお、各螺旋羽根2は隣合
う螺旋羽根の翼端が互いにラツプしない翼幅に設
定されている。
"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 3 show a first embodiment in which the present invention is applied to a threaded pile made of reinforced concrete. In these figures, reference numeral 1 denotes a pile body whose tip is tapered; On the outer circumferential surface of the pile body 1, spiral blades 2 are regularly and intermittently arranged spirally along the longitudinal direction of the pile body 1.
It is formed over almost the entire length of. This spiral blade 2 constitutes a part of a spiral screw extending along the longitudinal direction of the pile body 1. In the present invention, this screw is not a continuous spiral blade, but a regular intermittent screw. It is said to be a spiral blade. That is, the spiral blades 2 are formed in such a manner that they protrude outward in the radial direction of the pile body 1 and descend as they extend in the circumferential direction. Pile body 1 is removed every 240° in the spiral direction along the locus of the spirals lined up.
The three-bladed pile is provided with spiral blades 2 protruding from every other blade. Note that each spiral blade 2 is set to have a blade width such that the blade tips of adjacent spiral blades do not overlap with each other.

また、前記杭本体1および螺旋羽根2は共にコ
ンクリートにより一体に型枠成形され、その内部
には、図示しない鉄筋が埋設されている。一方、
この杭本体1の中心部には、回転伝達機の出力軸
もしくはその出力軸により回転させられる鋼棒等
のいわゆる動力軸を挿入係合させる係合孔3が形
成される(第2図参照)。なお、この係合孔3を、
杭本体1の先端部近くまで延在させ、この延在さ
せた係合孔に動力軸を挿入装着する構成とすれ
ば、杭自体に生じるねじれの量を小さくし得て、
ねじ状杭に生じ易いクラツクや欠損等を防止する
ことができるので好ましい。
The pile main body 1 and the spiral blade 2 are both integrally molded into a formwork of concrete, and reinforcing bars (not shown) are embedded inside the pile body 1 and the spiral blade 2. on the other hand,
An engagement hole 3 is formed in the center of the pile body 1, into which the output shaft of a rotation transmitter or a so-called power shaft such as a steel rod rotated by the output shaft is inserted and engaged (see Fig. 2). . Note that this engagement hole 3 is
By extending the shaft to near the tip of the pile body 1 and inserting the power shaft into the extended engagement hole, the amount of torsion that occurs in the pile itself can be reduced.
This is preferable because it can prevent cracks, defects, etc. that tend to occur in threaded piles.

このように構成されたねじ状杭の使用方法およ
び作用などについて説明する。
The method of use and operation of the screw-shaped pile constructed in this way will be explained.

第1図に示すようなねじ状杭を地中にねじ込む
場合には、例えば係合孔3内に緊密に嵌合する形
状の鋼棒(角棒)よりなる動力軸を差し込み、杭
本体1に貫入方向への付加を与えた状態で、前記
動力軸に対して、回転伝達機等により回転力を与
えてねじ込めばよい。
When screwing a threaded pile like the one shown in FIG. It is only necessary to apply a rotational force to the power shaft using a rotation transmitter or the like and screw the power shaft while applying the force in the penetration direction.

このようにすると、動力軸5の回転力が係合孔
3を介して杭本体1に直接伝わつて杭全体を回転
させ、各螺旋羽根2の螺進側先端2aが周方向に
存在する地盤Gを杭本体1の回転とともに切つ
て、杭を地盤Gのなかに貫入させて行く。
In this way, the rotational force of the power shaft 5 is directly transmitted to the pile main body 1 through the engagement hole 3 and rotates the entire pile, so that the spiral side tip 2a of each spiral blade 2 exists in the ground G in the circumferential direction. is cut as the pile main body 1 rotates, and the pile is penetrated into the ground G.

しかして、前記構成のねじ状杭にあつては、各
螺旋羽根2の螺旋側先端2aが地盤Gを切つて行
くから、その推進力(ねじ込み力)が大きく、ま
た、ねじ谷部の土の付着を減少させて、杭を地盤
の中に貫入することができるものである。さら
に、前記螺旋羽根2の見掛けのピツチが螺旋羽根
2が並ぶ螺旋の軌跡のピツチに対して2倍になつ
ているので、螺旋羽根2間の距離すなわちねじの
谷部の距離が大きくなり、さらに、リードアング
ルが小さいので推進力が得られる状態でねじ山の
間隔が広がるので、螺旋羽根2の間の体積が増大
して、土による圧着を軽減することができ、この
結果、杭自体の推進力の低下を防止することがで
きる。
In the case of the screw-shaped pile having the above structure, since the helical end 2a of each helical blade 2 cuts through the ground G, the driving force (screwing force) is large, and the soil in the screw valley is It reduces adhesion and allows the pile to penetrate into the ground. Furthermore, since the apparent pitch of the spiral blades 2 is twice the pitch of the spiral locus where the spiral blades 2 are lined up, the distance between the spiral blades 2, that is, the distance between the troughs of the thread becomes large, and Since the lead angle is small, the spacing between the screw threads increases while propulsive force is obtained, increasing the volume between the helical blades 2 and reducing the compression caused by the soil.As a result, the pile itself is propelled. A decrease in power can be prevented.

第4図および第5図は本考案の第2実施例を示
すもので、この実施例は、杭本体1の外周に突設
される螺旋羽根2を、螺旋羽根の並ぶ螺旋の軌跡
に沿つて螺進方向に270゜毎に配設し、全体として
2枚置きに螺旋羽根が並んだ4枚羽根の杭を構成
してなるものである。
4 and 5 show a second embodiment of the present invention, in which spiral blades 2 protruding from the outer periphery of a pile body 1 are arranged along a spiral locus where the spiral blades are lined up. The piles are arranged every 270 degrees in the spiral direction, and are composed of four-bladed piles in which every second spiral blade is lined up as a whole.

なお、この第2実施例にあつても第1実施例の
杭とほぼ同様の作用効果を期待することができ
る。
It should be noted that the second embodiment can also be expected to have substantially the same effects as the pile of the first embodiment.

また、第6図は本考案の第3実施例を示すもの
で、この実施例は、杭本体1の外周に突設される
螺旋羽根2を、螺旋羽根の並ぶ螺旋の軌跡に沿つ
て螺旋方向に288゜毎に配設し、全体として3枚置
きに螺旋羽根が並んだ5枚羽根の杭を構成してな
るものである。
Further, FIG. 6 shows a third embodiment of the present invention, in which the spiral blades 2 protruding from the outer periphery of the pile body 1 are moved in the spiral direction along the spiral trajectory of the spiral blades. The piles are arranged every 288 degrees, and are made up of five-bladed piles with spiral blades lined up every third.

なお、この第3実施例にあつても前記第1実施
例の杭とほぼ同様の作用効果を期待することがで
きる。
It should be noted that in this third embodiment as well, substantially the same effects as those of the pile of the first embodiment can be expected.

第7図は本考案の第3実施例を示すもので、こ
の実施例では第1図に示すような一枚置きに配設
した螺旋羽根2を、杭本体1の下部(先端部)、
中央部および上部の3個所にそれぞれ突設し、杭
本体1長手方向の途中に、螺旋羽根2を全く突設
しない筒状部5を設けたものである。
FIG. 7 shows a third embodiment of the present invention. In this embodiment, spiral blades 2 arranged alternately as shown in FIG.
A cylindrical portion 5 is provided which protrudes from three locations at the center and the upper portion, and does not have any spiral blades 2 protruding from the middle of the pile main body 1 in the longitudinal direction.

なお、この第3実施例においても、第1実施例
の場合とほぼ同様の作用効果が得られる上、筒状
部5によつてさらに土の付着を防止することがで
きる利点がある。
The third embodiment also has the advantage that substantially the same effects as those of the first embodiment can be obtained, and that the cylindrical portion 5 can further prevent soil from adhering.

また、実施例では、本考案をコンクリート製杭
に適用した例について述べたが、樹脂製杭などに
も適用可能であることは言うまでもない。
Further, in the embodiment, an example was described in which the present invention was applied to concrete piles, but it goes without saying that it is also applicable to resin piles.

「考案の効果」 以上説明したように本考案にあつては、先端が
先細りの杭本体の外周面に、杭本体の半径方向外
方に突出しかつ周方向に延びるに従い下降する形
態の螺旋羽根が杭本体の長手方向に沿つて螺旋状
に規則的かつ断続して設けられたねじ状杭であつ
て、前記螺旋羽根は螺旋羽根の並ぶ螺旋の軌跡に
沿つて螺進方向に、240゜、270゜もしくは288゜毎杭
本体の外周を回つた位置に突設され、かつ、各螺
旋羽根は隣合う螺旋羽根の翼端が互いにラツプし
ない翼幅に設定されてなる構成としたから、各螺
旋羽根が地山を杭本体の回転とともに切つて、杭
の貫入力および切削力を向上させ、かつ、ねじ谷
部に土の付着を減少させて、貫入地盤を荒らすこ
とがなく、したがつて、ねじとしての効果をおと
すことなく、杭を確実に地盤の中に貫入すること
ができる。また、リードアングルが小さいので推
進力が得られる状態でねじ山の間隔が広がるの
で、土による圧着を軽減することができるととも
に、それぞれ螺旋側先端が土をきるので、この結
果、杭自体の推進力の低下を防止することができ
る。前記により、各種地盤への適用性を向上する
ことができ、また、無振動、無騒音で行なわれる
基礎杭作業が確実効果的に実施できる。
"Effect of the invention" As explained above, the present invention has a spiral blade on the outer peripheral surface of the pile body whose tip is tapered, which protrudes outward in the radial direction of the pile body and descends as it extends in the circumferential direction. It is a threaded pile that is regularly and intermittently provided in a spiral shape along the longitudinal direction of the pile body, and the spiral blades are arranged at 240° and 270° in the spiral direction along the spiral locus where the spiral blades are lined up. Each spiral blade is protruded at a position that rotates around the outer circumference of the pile body every 288 degrees or 288 degrees, and each spiral blade is configured to have a wing span that does not overlap the wing tips of adjacent spiral blades. cuts the ground with the rotation of the pile body, improving the penetration force and cutting force of the pile, and reduces the adhesion of soil to the screw root, preventing the ground from being roughened. The pile can be reliably penetrated into the ground without compromising its effectiveness. In addition, since the lead angle is small, the spacing between the threads is widened while the propulsion force is obtained, which reduces the pressure caused by the soil, and the ends of each helical side cut through the soil, resulting in the pile itself being propelled. A decrease in power can be prevented. As a result of the above, applicability to various types of ground can be improved, and foundation pile work can be carried out reliably and effectively without vibration and noise.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図ないし第3図は本考案の第1実施例を示
すもので、第1図はねじ状杭全体の正面図、第2
図はその平面図、第3図はこのねじ状杭を地盤に
ねじ込んだ状態を示す正面図、第4図および第5
図は本考案の第2実施例を示すもので、第4図は
ねじ状杭全体の正面図、第5図はその平面図、第
6図は本考案の第3実施例を示すねじ状杭の平面
図、第7図は本考案の第4実施例を示すねじ状杭
全体の正面図、第8図は従来のねじ状杭の一構造
例を示す一部を切り欠いた正面図である。 1……杭本体、2……螺旋羽根、2a……螺旋
羽根の螺進側先端、3……係止孔、G……地盤。
Figures 1 to 3 show the first embodiment of the present invention, in which Figure 1 is a front view of the entire threaded pile, and Figure 2
The figure is a plan view, Figure 3 is a front view of this threaded pile screwed into the ground, Figures 4 and 5 are
The figures show a second embodiment of the present invention, Fig. 4 is a front view of the entire threaded pile, Fig. 5 is a plan view thereof, and Fig. 6 is a threaded pile showing a third embodiment of the invention. FIG. 7 is a front view of the entire threaded pile showing the fourth embodiment of the present invention, and FIG. 8 is a partially cutaway front view showing an example of the structure of a conventional threaded pile. . 1... Pile body, 2... Spiral blade, 2a... Spiral side tip of spiral blade, 3... Locking hole, G... Ground.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 先端が先細りの杭本体の外周面に、杭本体の半
径方向外方に突出しかつ周方向に延びるに従い下
降する形態の螺旋羽根が杭本体の長手方向に沿つ
て螺旋状に規則的かつ断続して設けられたねじ状
杭であつて、前記螺旋羽根は、螺旋羽根の並ぶ螺
旋の軌跡に沿つて螺進方向に240゜、270゜もしくは
288゜毎に杭本体の外周を回つた位置に突設され、
かつ、各螺旋羽根は隣合う螺旋羽根の翼端が互い
にラツプしない翼幅に設定されていることを特徴
とするねじ状杭。
On the outer circumferential surface of the pile body with a tapered tip, spiral blades that protrude outward in the radial direction of the pile body and descend as they extend in the circumferential direction are arranged regularly and intermittently in a spiral shape along the longitudinal direction of the pile body. A screw-shaped pile is provided, and the spiral blades are arranged at an angle of 240°, 270°, or
Projected at positions around the outer circumference of the pile body every 288°,
The threaded pile is characterized in that each of the spiral blades is set to have a wing span such that the wing tips of adjacent spiral blades do not overlap with each other.
JP11848586U 1986-08-01 1986-08-01 Expired JPH0338266Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11848586U JPH0338266Y2 (en) 1986-08-01 1986-08-01

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11848586U JPH0338266Y2 (en) 1986-08-01 1986-08-01

Publications (2)

Publication Number Publication Date
JPS6327553U JPS6327553U (en) 1988-02-23
JPH0338266Y2 true JPH0338266Y2 (en) 1991-08-13

Family

ID=31004980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11848586U Expired JPH0338266Y2 (en) 1986-08-01 1986-08-01

Country Status (1)

Country Link
JP (1) JPH0338266Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4553475B2 (en) * 1999-10-25 2010-09-29 中国電力株式会社 Heat transfer tube outer surface inspection device

Also Published As

Publication number Publication date
JPS6327553U (en) 1988-02-23

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