JPS6134525B2 - - Google Patents

Description

【発明の詳細な説明】 本発明は建築土木等で用いる杭固定工法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile fixing method used in construction and civil engineering.

建築土木等で用いる杭において、土中に入れた
杭の先端部が杭本体よりも大きければ支持力及び
引張抵抗は大である。ところが、先端部をあらか
じめ大きく成している杭は土中に打込み難く、無
理に打込むとしても大きな打設機械を必要として
いた。また、打設の際に先端部が破壊されたりし
て目指す安定的支持力は得られなかつた。 In piles used in construction, civil engineering, etc., if the tip of the pile inserted into the soil is larger than the pile itself, the bearing capacity and tensile resistance are large. However, piles with large tips are difficult to drive into the soil, and even if they were to be forced into the ground, a large driving machine was required. In addition, the desired stable supporting force could not be obtained because the tip part was destroyed during pouring.

本発明は、中実体である杭先端部に膨張剤を装
填した後、杭本体を土中に入れて、杭先端部のみ
を拡大させて、安定的な支持力及び引張抵抗を得
ることを目的とする杭固定工法である。 The purpose of the present invention is to obtain stable supporting force and tensile resistance by loading an expanding agent into the pile tip, which is a solid body, and then inserting the pile body into the soil to expand only the pile tip. This is a pile fixing method.

以下本発明を図面に示す実施例に基いて説明す
ると、下側周部に切目３を形成してなる中空状杭
先拡大金具２を杭本体１の先端に取付け、この中
空状杭先拡大金具２内に袋詰めにした膨張剤５を
入れた後、前記杭先拡大金具２の下端開口部に杭
先金具４を嵌着し、このようになした杭本体１を
土中の目的の深さまで入れ、時間の経過によつて
杭先を拡大させることを特徴とする杭固定工法で
ある。 The present invention will be described below based on an embodiment shown in the drawings. A hollow pile tip enlarging fitting 2 having a cut 3 formed on the lower periphery is attached to the tip of the pile body 1, and the hollow pile tip enlarging fitting 2 is attached to the tip of the pile body 1. 2, the pile tip fitting 4 is fitted into the lower end opening of the pile tip expanding fitting 2, and the pile body 1 thus formed is placed in the soil at a desired depth. This is a method of fixing piles that is characterized by inserting the pile in the same direction and expanding the tip of the pile over time.

杭本体１は金具或いは合成樹脂材等からなるも
ので、中実体である。杭先拡大金具２は杭本体１
の先端に取付けられるもので、その取付け方法は
熔着、嵌着等のいずれであつてもよい。杭先拡大
金具２は中空状の円筒体で、下側周部に切目３を
形成している。円筒体の上端面は杭本体への熔着
の都合上天板で閉塞していてもよいが、開口して
いても差しつかえない。切目３の長さ、大きさ、
数、幅等は膨張剤の膨張性能等に応じて決定す
る。切目３は杭先拡大金具２の下側周部に複数個
形成しておくことが望ましい。杭先拡大金具２の
下端開口部には杭先金具４を嵌着する。打設によ
つて杭本体１を土中に入れる場合には、杭先金具
４の先端を尖らせておくと、打込みがスムーズ且
つ容易である。埋設によつて杭本体１を土中に入
れる場合には、杭先金具４の先端は尖つていなく
ても、単なるキヤツプであればよい。図中の４ａ
は杭先拡大金具２への嵌合部である。埋設の場
合、掘削機等にてあらかじめ所定の深さに設けた
削孔６に杭本体を埋設するのである。 The pile body 1 is made of metal fittings or synthetic resin material, and is a solid body. The pile tip expansion fitting 2 is the pile body 1
The attachment method may be welding, fitting, etc. The pile tip enlarging fitting 2 is a hollow cylindrical body, and has a cut 3 formed in its lower circumference. The upper end surface of the cylindrical body may be closed with a top plate for convenience of welding to the pile body, but it may also be open. The length and size of cut 3,
The number, width, etc. are determined depending on the expansion performance of the expansion agent. It is desirable that a plurality of cuts 3 be formed on the lower circumference of the pile tip enlarging metal fitting 2. A pile tip fitting 4 is fitted into the lower end opening of the pile tip expanding fitting 2. When the pile main body 1 is inserted into the soil by driving, the tip of the pile tip fitting 4 is sharpened to make driving smooth and easy. When the pile main body 1 is placed in the soil by burying, the tip of the pile end fitting 4 does not need to be sharp, but may just be a cap. 4a in the diagram
is a fitting part to the pile tip enlargement fitting 2. In the case of burying, the pile body is buried in a hole 6 that is previously drilled at a predetermined depth using an excavator or the like.

本発明は、下側周部に切目３を形成してなる中
空状杭先拡大金具２を中実体である杭本体１の先
端に取付け、この中空状杭先拡大金具２内に袋詰
めにした膨張剤５を入れた後、前記杭先拡大金具
２の下端開口部に杭先金具４を嵌着し、このよう
になした杭本体１を土中の目的の深さまで入れ、
時間の経過によつて杭先を拡大させることを特徴
とする杭固定工法である。 In the present invention, a hollow pile tip expanding fitting 2 having cuts 3 formed on the lower circumference is attached to the tip of a solid pile body 1, and a bag is packed inside the hollow pile tip expanding fitting 2. After adding the expansion agent 5, the pile tip fitting 4 is fitted into the lower end opening of the pile tip expanding fitting 2, and the pile body 1 thus formed is inserted into the soil to the desired depth,
This is a pile fixing method that is characterized by expanding the pile tip over time.

上記した膨張剤５とは、水で練りまぜて目的の
孔や筒内に充填しておけば、硬化、膨張して計画
的に目的物に亀裂膨張を生じさせるもので、例え
ば小野田セメント株式会社の商品名ブライスター
等である。 The above-mentioned swelling agent 5 is an agent that, when mixed with water and filled into a target hole or cylinder, hardens and expands to cause planned cracking and expansion in the target object. For example, Onoda Cement Co., Ltd. The product name is Blystar etc.

杭本体１が中空状であれば、杭本体１を土中の
目的の深さまで入れた後に膨張剤を杭本体内に注
入すればよいが、杭本体１が中実体であれば、こ
のような方法はとれない。従つて、本発明工法の
如く、杭本体１を土中の目的の深さまで入れる前
に、杭本体１の先端に取付けた中空状杭先拡大金
具２内に袋詰めにした膨張剤５を入れておく。こ
の膨張剤は、水で練りまぜてビニール袋等に詰め
ておくのである。尚、第６図に示すように、杭本
体１の径を小さく、杭先拡大金具２の径を大にな
して、支持力、引張力の極めて大なる杭となして
もよい。先端に取付けた杭先拡大金具２内に袋詰
めにした膨張剤を入れた後、杭先金具４で杭先拡
大金具２に蓋をした杭本体１を土中の目的の深さ
まで入れると、約15〜24時間で杭本体１の先端部
が膨張剤の硬化膨張によつて拡大されるのであ
る。膨張剤は杭先拡大金具２内において２〜３倍
に膨張する。尚、杭本体を削孔に埋設する工法を
採ると、埋設後は削孔を埋め戻しておく。 If the pile body 1 is hollow, the expansion agent may be injected into the pile body after the pile body 1 is inserted into the soil to the desired depth; however, if the pile body 1 is solid, such There is no way to do it. Therefore, as in the construction method of the present invention, before inserting the pile body 1 into the soil to the desired depth, the expansion agent 5 packed in a bag is placed in the hollow pile tip expansion fitting 2 attached to the tip of the pile body 1. I'll keep it. This swelling agent is mixed with water and packed in a plastic bag or the like. Incidentally, as shown in FIG. 6, the diameter of the pile main body 1 may be made small and the diameter of the pile tip enlarging fitting 2 may be made large to obtain a pile with extremely large supporting force and tensile force. After putting the bagged expansion agent into the pile tip expansion fitting 2 attached to the tip, the pile body 1 with the pile tip expansion fitting 2 covered by the pile tip fitting 4 is inserted into the soil to the desired depth. In about 15 to 24 hours, the tip of the pile body 1 is expanded by the hardening and expansion of the expansion agent. The expansion agent expands 2 to 3 times within the pile tip expansion fitting 2. If a method is used in which the pile body is buried in a drilled hole, the hole should be backfilled after burying.

上記の如くなる本発明工法によると、中実体の
杭本体であつても土中の先端部を容易に拡大させ
ることができる。つまり、膨張剤を収容する中空
状杭先拡大金具を先端部に取付けてなる杭本体を
用いるから、杭本体は中実体であつてもよい。ま
た、中空状杭先拡大金具の径よりも極めて小さい
径の杭本体であつてもよい。このような径小の中
実杭本体であつても土中に入れた先端部を容易に
拡大させて大なる支持力、引張力を得ることがで
き、建築土木等に優れた杭を提供することができ
る工法である。 According to the construction method of the present invention as described above, even if the pile body is a solid body, the tip portion in the soil can be easily expanded. In other words, since a pile main body is used in which a hollow pile tip expansion fitting that accommodates an expansion agent is attached to the tip end, the pile main body may be a solid body. Furthermore, the pile body may have a diameter that is extremely smaller than the diameter of the hollow pile tip expansion fitting. Even with such a small-diameter solid pile main body, the tip inserted into the soil can be easily expanded to obtain large supporting and tensile forces, providing piles that are excellent for construction and civil engineering. This is a construction method that can be used.

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

図面は本発明の実施例を示すもので、第１図Ａ
は中央部を切欠いた杭本体の正面図、第１図Ｂは
中空状杭先拡大金具の正面図、第１図Ｃは杭先金
具の正面図、第２図は杭本体の先端に熔着した杭
先拡大金具内に袋詰めにした膨張剤を入れると共
に杭先金具を嵌めた状態の断面図、第３図は本発
明工法に用いる杭本体を土中に打設せんとする正
面図、第４図は杭本体を土中の目的の深さに入れ
るのに埋設による状態を示す図、第５図は膨張剤
によつて杭先拡大金具が拡大した状態の図、第６
図は径小な杭本体を用いた図。 １……杭本体、２……杭先拡大金具、３……切
目、４……杭先金具、５……膨張剤。 The drawings show an embodiment of the present invention, and FIG.
Figure 1B is a front view of the hollow pile tip expansion fitting, Figure 1C is a front view of the pile tip fitting, and Figure 2 is a front view of the pile body with the central part cut out. Fig. 3 is a cross-sectional view of a state in which a bagged expansion agent is put into the pile tip expanding fitting and the pile tip fitting is fitted; Figure 4 shows the state in which the pile body is inserted into the soil at the desired depth by burying it, Figure 5 shows the state in which the pile tip expansion fitting is expanded by an expansion agent, and Figure 6
The figure is a diagram using a small-diameter pile body. 1... Pile body, 2... Pile tip expansion fitting, 3... Cut, 4... Pile tip fitting, 5... Expansion agent.

Claims (1)

【特許請求の範囲】[Claims] １ 下側周部数個所に複数の切目を形成してなる
中空状杭先拡大金具を中実体である杭本体の先端
に取付け、この中空状杭先拡大金具内に袋詰めに
した膨張剤を入れた後、前記杭先拡大金具の下端
開口部に杭先金具を嵌着し、このようになした杭
本体を土中の目的の深さまで入れ、時間の経過に
よつて杭先を拡大させることを特徴とする杭固定
工法。1 Attach a hollow pile tip expansion fitting made of multiple cuts at several places around the lower circumference to the tip of the solid pile body, and put a bag of expansion agent into this hollow pile tip expansion fitting. After that, a pile tip fitting is fitted into the lower end opening of the pile tip expanding fitting, and the pile body made in this manner is inserted into the soil to a desired depth, and the pile tip is expanded over time. A pile fixing method featuring: