JPS62296011A - Spiral pile - Google Patents

Abstract

PURPOSE:To permit the ground to be compacted when penetrating a pile into the ground by a method in which a spiral blade is projectionally formed on the periphery of a round body, recessed portions are formed at a given interval on the blade, and the head of the body is shaped into an inverted conical trapezoidal form. CONSTITUTION:The head 1a of a spiral pile A is shaped into an inverted conical trapezoidal form, whose upper size is larger than the lower. A spiral blade 2 is projectionally provided on the periphery of the body 1, and recessions 2a are formed at a given interval on the blade 2. The blade 2 as a cutting blade is cut into the ground by means of the recessions 2a. The recessions 2a are formed on the same positions in the longitudinal direction of the body 1, and a triangular columnar projection 5 is projectionally formed on the upper end of the head 1a. The surrounding ground of the pile A can thus be effectively consolidated and compacted by driving the head 1a of the inverted conical trapezoidal form into the ground.

Description

【発明の詳細な説明】 ３、発明の詳細な説明 （産業上の利用分野） この発明は比較的小規模の建物の杭として使用される、
コンクリート製の螺旋杭に関するものである。[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention is used as a pile for a relatively small-scale building.
This relates to concrete spiral piles.

（発明が解決しようとする問題点） 従来の螺旋杭には施工性の良さ、支持力の大きさ等の利
点を有している一方、排出出量が多い場合等４こは杭の
ねじ込みが困難であるという雑煮−ｈ（あり、こＪｌが
客用什への諦実声なっていた、そこで杭のねじ込みの難
しさを解消するために出願人は螺旋の翼片に凹みを形成
してこれを切刃として土砂を圧入しながらねじ込むこと
を可能にした螺旋杭を既に提案している。(Problems to be solved by the invention) While conventional spiral piles have advantages such as good workability and large bearing capacity, there are four cases where the piles cannot be screwed in, such as when the amount of discharge is large. This Jl was a real complaint to the customer service that it was difficult, so in order to solve the difficulty of screwing in the pile, the applicant formed a recess in the spiral wing piece. We have already proposed a helical pile that uses this as a cutting edge to make it possible to screw in earth and sand while pressing it in.

この発明はこの螺旋杭に改良を加え、更に地盤締め固め
の効果を付加する目的からなされたもので、杭頭部をテ
ーパ状に形成することｌこよりこれを解決しようとする
ものである。This invention was made for the purpose of improving this spiral pile and adding the effect of soil compaction, and attempts to solve this problem by forming the pile head in a tapered shape.

（問題点を解決するための手段） 本発明では螺旋杭の頭部を逆円錐台状に下方から上方へ
径を次第に大きくすることにより地盤を締め固めること
を可能にする。(Means for Solving the Problems) The present invention makes it possible to compact the ground by gradually increasing the diameter of the head of the spiral pile in the shape of an inverted truncated cone from the bottom to the top.

この逆円錐台状の頭部は杭の打ち込み時及びねじ込み時
に地盤を下方及び杭外周方向に圧密する作用を果たし、
この結果地盤の締め固めが可能となる。This inverted truncated conical head acts to consolidate the ground downward and in the direction of the outer circumference of the pile when driving and screwing the pile.
As a result, compaction of the ground becomes possible.

螺旋杭は円形断面の本体外周に螺旋状の翼片が突設され
たもので、その翼片には所要間隔毎に凹状部が形成され
、凹状部は本体の長さ方向の同一位置に配置される。Spiral piles have spiral wing pieces protruding from the outer periphery of a body with a circular cross section, and the wing pieces have concave portions formed at required intervals, and the concave portions are arranged at the same position in the length direction of the body. be done.

（実施例） 以下本発明を一実施例を示す図面に基づいて説明する。(Example) The present invention will be explained below based on the drawings showing one embodiment.

この発明の螺旋杭Ａは第１図に示すように本体１の頭部
１ａを逆円錐台状に形成したものであり、その楔作用に
よって地盤を圧密し、これを締め固めるものである。As shown in FIG. 1, the spiral pile A of the present invention has a head 1a of a main body 1 formed in the shape of an inverted truncated cone, and its wedge action consolidates the ground and compacts it.

螺旋杭Ａの少なくとも頭部１ａ下方の本体１外周には螺
旋状の翼片２が突設される。そしてこの翼片２には第１
図−■のように所要間隔毎に凹状部２ａが形成され、こ
の凹状部２ａによって回転方向側の各翼片２が切刃とな
って地盤中に食い込んでいく。凹状部２ａは本体１長さ
方向の同一位置に形成される。A spiral wing piece 2 is provided protruding from the outer periphery of the main body 1 of the spiral pile A at least below the head 1a. And this wing piece 2 has a first
As shown in FIG. The concave portions 2a are formed at the same position in the length direction of the main body 1.

螺旋杭Ａは第１図のように頭部１ａを含めて一体に製作
される場合と、第２図のように頭部１ａを分離して製作
される場合とがあり、後者の場合下側の本体１の接続部
に金物６を埋設する一方、頭部１ａ下端に金物乙に嵌合
する溝４を設けておく。The helical pile A may be manufactured in one piece including the head 1a as shown in Figure 1, or it may be manufactured with the head 1a separated as shown in Figure 2. In the latter case, the lower side A metal fitting 6 is buried in the connection part of the main body 1, while a groove 4 into which the metal fitting B is fitted is provided at the lower end of the head 1a.

また頭部１ａは第１図、第２図のように翼片２を突設す
るものと第３図のように設けないものとがあり、螺旋杭
Ａは一体のタイプと分離タイプ、そして頭部１ａに翼片
２を付けるタイプと付けないタイプとを任意に組み合わ
せて製作することができる。In addition, there are two types of head 1a, one with wing pieces 2 protruding as shown in Figures 1 and 2, and one without wing pieces 2 as shown in Figure 3, and the spiral pile A has two types: an integral type, a separated type, and a head part 2. It is possible to manufacture the part 1a by arbitrarily combining types with and without wing pieces 2 attached.

頭部１ａの上端には第１図乃至第３図のように打ち込み
用の例えば三角柱状の突起５が突設されるが、この形状
は第４図、第５図のように四角柱、五角柱等自由に形成
できる。For example, a triangular prism-shaped protrusion 5 for driving is protruded from the upper end of the head 1a as shown in FIGS. Can be formed into any shape such as a prism.

（発明の効果） この発明では以上の通り円錐台状の頭部を打ち込むこと
によってこれが楔作用を果たすため杭周囲の地盤を有効
に圧密、そして締め固めることが可能である。(Effects of the Invention) As described above, in the present invention, by driving the truncated conical head, the truncated conical head acts as a wedge, so that the ground around the pile can be effectively consolidated and compacted.

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

第１図−Ｉ、ＩＩは本発明の製作例を示したそれぞれ正
面図、平面図、第２図、第３図は他の製作例を示した正
面図であり、第４図、第５図は突起の他の形状を示した
平面図である。 Ａ：螺旋杭、１：本体、１ａ：頭部、２：翼片、２ａ：
凹状部、５＝金物、４：溝、５：突起。 第１図 ｉ 第４図 第２図　　第３図 第５図1-I and II are respectively a front view and a plan view showing a manufacturing example of the present invention, FIGS. 2 and 3 are front views showing other manufacturing examples, and FIGS. 4 and 5. FIG. 3 is a plan view showing another shape of the protrusion. A: Spiral pile, 1: Main body, 1a: Head, 2: Wing piece, 2a:
Concave portion, 5 = Hardware, 4: Groove, 5: Protrusion. Figure 1 i Figure 4 Figure 2 Figure 3 Figure 5

Claims (1)

【特許請求の範囲】[Claims] （１）円形断面の本体の外周に螺旋状の翼片が突設され
、その翼片には所要間隔毎に凹状部が本体長さ方向の同
一位置に形成されて翼片の外周辺が断続的である螺旋杭
であり、頭部は逆円錐台状に下方から上方へ径を次第に
大きくしてあることを特徴とする螺旋杭。(1) Spiral wing pieces are protruded from the outer periphery of the main body with a circular cross section, and concave portions are formed at the same position in the length direction of the main body at required intervals on the wing pieces, so that the outer periphery of the wing pieces is interrupted. A spiral pile with a head shape that gradually increases in diameter from the bottom to the top in the shape of an inverted truncated cone.