JPH0378451B2 - - Google Patents
Info
- Publication number
- JPH0378451B2 JPH0378451B2 JP18366988A JP18366988A JPH0378451B2 JP H0378451 B2 JPH0378451 B2 JP H0378451B2 JP 18366988 A JP18366988 A JP 18366988A JP 18366988 A JP18366988 A JP 18366988A JP H0378451 B2 JPH0378451 B2 JP H0378451B2
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- side plate
- tip shoe
- plate portion
- bottom plate
- 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
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000005482 strain hardening Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、コンクリートパイルを地中に打設す
るとき該コンクリートパイルの先端を保護するた
めに冠着する先端金具（以下、先端シユーとい
う）を製造する方法に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a tip metal fitting (hereinafter referred to as a tip shoe) that is attached to protect the tip of a concrete pile when the concrete pile is cast into the ground. The present invention relates to a method for manufacturing.
第２図は従来の先端シユー１を冠着したコンク
リートパイル２の一例を示す断面図である。
FIG. 2 is a sectional view showing an example of a concrete pile 2 to which a conventional tip shoe 1 is attached.
２ａはコンクリートパイルの継手金具、２ｂは
PC鋼線である。 2a is the concrete pile joint fitting, 2b is the joint fitting for the concrete pile.
It is PC steel wire.
第３図は上記の先端シユー１の拡大断面を示
す。この先端シユー１は円形平板状の底板１ａと
円筒状のリング１ｂとを別体に構成し、溶接して
連結してある。１ｃは溶接のビードである。 FIG. 3 shows an enlarged cross section of the tip shoe 1 described above. This tip shoe 1 is constructed by separately constructing a circular flat bottom plate 1a and a cylindrical ring 1b, which are connected by welding. 1c is a welding bead.
上記のリング１ｂには２条の円周溝状の凹部１
b-1，１b-2を設けてある。この円周溝状凹部１
b-1，１b-2を設けておくと、凹部の内周面に突条
が形成されてコンクリートパイルに対する結合が
強固になる。 The ring 1b has two circumferential groove-like recesses 1.
b -1 and 1b -2 are provided. This circumferential groove-shaped recess 1
By providing b -1 and 1b -2 , a protrusion is formed on the inner circumferential surface of the recess, and the connection to the concrete pile is strengthened.
上記の従来形先端シユーの底板１ａは、所望の
強度を得るため比較的厚く（4.5〜６mm）構成さ
れ、リング１ｂは重量軽減、コスト低減のため比
較的薄く（1.6〜3.2mm）構成される。 The bottom plate 1a of the conventional tip shoe described above is relatively thick (4.5 to 6 mm) to obtain the desired strength, and the ring 1b is relatively thin (1.6 to 3.2 mm) to reduce weight and cost. .
上記のような構成の従来形先端シユー（第３
図）は、溶接作業を必要とするため製造工程が複
雑で所要工数が大きくコスト高になる。特に、前
述の如く厚さ寸法の異なる底板１ａとリング１ｂ
とを溶接するため溶接が難しく、溶接部の品質の
均一性を保持して歩留りを良くしようとすると多
大の管理コストが掛かる。
The conventional tip shoe (third
(Figure) requires welding, making the manufacturing process complicated, requiring a large number of man-hours, and increasing costs. In particular, as mentioned above, the bottom plate 1a and the ring 1b have different thickness dimensions.
Welding is difficult because it requires welding, and it costs a lot of management to maintain uniformity in the quality of the welded parts and improve the yield.
本発明は上述の事情に鑑みて為され、製造工程
が簡単で品質管理が容易で、量産に適する低コス
トのコンクリートパイル用先端シユーの製造方法
を提供することを目的とする。 The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a low-cost manufacturing method for a tip shoe for concrete piles, which has a simple manufacturing process, easy quality control, and is suitable for mass production.
上記の目的を達成するため、本発明の先端シユ
ー製造方法は、厚さ寸法4.5〜９mmの鋼板を素材
として用い、その周辺部に冷間塑性加工を施す。
In order to achieve the above object, the tip shoe manufacturing method of the present invention uses a steel plate having a thickness of 4.5 to 9 mm as a raw material, and cold plastic working is performed on the peripheral portion thereof.
即ち、素材の中央部には圧延加工を施さず、素
材の厚さ寸法その侭で円形平板状の底板部を形成
する。 That is, the center portion of the material is not rolled, and a circular flat bottom plate portion is formed along the thickness of the material.
そして、冷間塑性加工を施した素材の周辺部に
より、厚さ寸法２〜3.2mmの円筒状側板部を成形
し、かつ該側板部の周方向に２条の溝状凹部を設
ける。 Then, a cylindrical side plate portion having a thickness of 2 to 3.2 mm is formed from the peripheral portion of the material subjected to cold plastic working, and two groove-like recesses are provided in the circumferential direction of the side plate portion.
上記の操作により、円筒状側板部は加工硬化す
る。 By the above operation, the cylindrical side plate portion is work hardened.
上記の構成によれば、厚さ寸法4.5〜９mmの鋼
板を素材として用いるので、その中央部に別段の
塑性加工を施すことなく、その侭で先端シユーの
底板部を形成せしめることが出来る。
According to the above structure, since a steel plate having a thickness of 4.5 to 9 mm is used as the raw material, the bottom plate portion of the tip shoe can be formed therein without performing any additional plastic working on the central portion.
この底板部の厚さ寸法が4.5mm未満では所要の
強度が得られない。 If the thickness of the bottom plate portion is less than 4.5 mm, the required strength cannot be obtained.
また、厚さ寸法が９mmを越えると材料費が割高
になる上に加工困難で、結果的に過剰品質となり
不経済であるから、上記の4.5〜９mmが適正範囲
である。 Furthermore, if the thickness exceeds 9 mm, the material cost will be relatively high and processing will be difficult, resulting in excessive quality and being uneconomical, so the above-mentioned range of 4.5 to 9 mm is appropriate.
前記円筒状部を２〜3.2mm厚となるように塑性
変形させるので、溶接工程が不要で加工が容易で
あり、しかも所要の強度と経済性が両立する。 Since the cylindrical part is plastically deformed to a thickness of 2 to 3.2 mm, it is easy to process without the need for a welding process, and it also achieves both the required strength and economical efficiency.
即ち、２mm未満の厚さにすることは著しく加工
を困難ならしめ、また、3.2mm以上の厚さにする
と材料費が割高となつて不経済である。こうした
理由で、側板部の厚さ寸法を２〜3.2mmとするこ
とにより、初めて、強度、加工性、経済性をバラ
ンスさせて満足せしめ得る。 That is, if the thickness is less than 2 mm, processing becomes extremely difficult, and if the thickness is 3.2 mm or more, the material cost becomes relatively high, making it uneconomical. For these reasons, by setting the thickness of the side plate portion to 2 to 3.2 mm, strength, workability, and economic efficiency can be balanced and satisfied for the first time.
第１図は本発明の製造方法の一実施例における
加工工程の説明図である。
FIG. 1 is an explanatory diagram of processing steps in an embodiment of the manufacturing method of the present invention.
同図Ａは素材の鋼板４を示し、その厚さ寸法は
t1である。本発明を実施する際、上記寸法t1を、
4.5mm≦t1≦９mm
の範囲内に選定する。 Figure A shows a steel plate 4 as a material, and its thickness dimension is
t 1 . When carrying out the present invention, the above-mentioned dimension t 1 is selected within the range of 4.5 mm≦t 1 ≦9 mm.
上記の素材鋼板４の周辺部に冷間塑性加工を施
して、同図Ｂに示す先端シユー３の円筒状側板部
３ｂを形成する。 Cold plastic working is applied to the peripheral portion of the raw steel plate 4 to form the cylindrical side plate portion 3b of the tip shoe 3 shown in FIG.
素材鋼板４の中央部４ａは、その侭で（同じ厚
さ寸法t1で）先端シユー３の円形底板部３ａを形
成する。 The central portion 4a of the raw steel plate 4 forms the circular bottom plate portion 3a of the tip shoe 3 on its side (with the same thickness dimension t1 ).
本実施例においては厚さ寸法６mmの素材鋼板４
の周辺部４ｂにプレス絞り加工を施して厚さ2.5
mmの円筒状側板部３ｂを成形し、かつ、上記側板
部３ｂに円周溝状の２本の凹部３b-1，３b-2をプ
レス成形する。 In this example, a material steel plate 4 with a thickness of 6 mm is used.
The peripheral part 4b is press-drawn to a thickness of 2.5 mm.
A cylindrical side plate portion 3b with a diameter of mm is formed, and two circumferential groove-shaped recesses 3b -1 and 3b -2 are press-molded on the side plate portion 3b.
素材周辺のプレス絞り加工を施した部分を除く
中央部は素材の厚さ（本例において６mm）と等寸
の底板部３ａとなる。 The central portion excluding the press-drawn portion around the material becomes a bottom plate portion 3a having the same size as the thickness of the material (6 mm in this example).
上に述べた加工、即ち(イ)円筒状側板部３ｂの成
形、及び(ロ)円周溝状の凹部３b-1，３b-2の成形
は、どのような順序で行なつてもよく、又、一挙
に１工程で成形してもよい。またプレス加工のみ
でなく他の加工方法（例えばロール）などを併用
することもできる。 The above-mentioned processing, that is, (a) forming the cylindrical side plate portion 3b and (b) forming the circumferential groove-shaped recesses 3b -1 and 3b -2 , may be performed in any order. Alternatively, it may be molded all at once in one step. In addition to pressing, other processing methods (for example, rolling) can also be used in combination.
本実施例におけるが如くプレス絞り加工を行つ
た場合でも、これにロール加工を併用した場合で
も、これを冷間で行うと、円筒状側板部３ｂは大
きい圧延率で塑性変形を受け、加工硬化を生じ
る。このためコンクリートパイルを打ち込む際、
これに冠着した先端シユーが土砂、礫、軟石など
と激しく衝突したり摩擦したりしても亀裂や変形
を生じる虞れが無い。 Even when press drawing is performed as in this example, or when roll processing is used in combination with this, if this is performed cold, the cylindrical side plate portion 3b undergoes plastic deformation at a large rolling rate and is work hardened. occurs. For this reason, when pouring concrete piles,
There is no risk of cracking or deformation even if the tip shoe attached to this is violently collided with or rubbed against earth, sand, gravel, soft stone, etc.
前記の実施例において円周溝状の凹部３b-1，
３b-2の設置個数を２個とした理由は、これを１
個だけにするとコンクリートパイルとの結合が不
完全となる虞れが有ること、並びに、３本若しく
はそれ以上設けても２本の場合に比して実用上の
メリツトが無いにも拘らず製造コストが増加する
ことによる。 In the above embodiment, the circumferential groove-shaped recess 3b -1 ,
The reason why the number of 3b -2 installed is 2 is that it can be set to 1.
If only one piece is used, there is a risk that the connection with the concrete pile will be incomplete, and even if three or more pieces are provided, there is no practical advantage compared to two pieces, but the manufacturing cost is high. due to an increase in
以上に説明した実施例の先端シユーの製造方法
は、溶接作業を含まないので製造工程が簡単で、
溶接に関する面倒な工程管理、品質管理、安全対
策を必要とせず、常温加工で成形することができ
るので量産に適している。その上、底板部の厚さ
及び側板部の厚さが技術的条件と経済性とのバラ
ンスを保つていて、所要の強度を備え、しかも低
コストで生産し得る。 The manufacturing method of the tip shoe of the embodiment described above does not involve welding work, so the manufacturing process is simple.
It is suitable for mass production because it can be formed at room temperature without the need for troublesome process control, quality control, or safety measures related to welding. Moreover, the thickness of the bottom plate part and the thickness of the side plate parts maintain a balance between technical conditions and economic efficiency, provide the required strength, and can be produced at low cost.
以上に説明したように、本発明に係るコンクリ
ートパイル先端シユーの製造方法は、製造工程に
溶接を含まないので簡単であり、品質管理が容易
で量産に適し、低コストである。
As explained above, the method for manufacturing the concrete pile tip shoe according to the present invention is simple because the manufacturing process does not include welding, easy to control quality, suitable for mass production, and low cost.
第１図は本発明の製造方法の一実施例を示す工
程説明図である。第２図は従来の先端シユーを設
けたコンクリートパイルの部分的断面図、第３図
は上記従来の先端シユーの断面図である。
１……従来の先端シユー、１ａ……底板、１ｂ
……リング、１b-1，１b-2……円周溝状凹部、１
ｃ……溶接ビート、２……コンクリートパイル、
２ａ……接手金具、２ｂ……PC鋼線、３……本
発明の先端シユー、３ａ……底板部、３ｂ……側
板部、３b-1，３b-2……円周溝状の凹部、４……
素材。
FIG. 1 is a process explanatory diagram showing an embodiment of the manufacturing method of the present invention. FIG. 2 is a partial sectional view of a concrete pile provided with a conventional tip shoe, and FIG. 3 is a sectional view of the conventional tip shoe. 1... Conventional tip shoe, 1a... Bottom plate, 1b
...Ring, 1b -1 , 1b -2 ...Circumferential groove-shaped recess, 1
c...Welding beat, 2...Concrete pile,
2a...Joint fitting, 2b...PC steel wire, 3...Tip shoe of the present invention, 3a...Bottom plate part, 3b...Side plate part, 3b -1 , 3b -2 ...Circumferential groove-shaped recessed part, 4...
material.
Claims (1)
ーを製造する方法において、(a)厚さ寸法4.5乃至
９mmの鋼板を素材とし、該素材の中央部には別段
の加工を施すことなく、その周辺部に冷間塑性加
工を施し、(b)上記素材と同じ厚さの円形平板状の
底板部と、周方向に２条の溝状凹部を設けた厚さ
寸法２乃至3.2mmの円筒状側板部とを有するシユ
ーを一体成形し、(c)前記の側板部を加工硬化せし
めることを特徴とする、コンクリートパイルの先
端シユーの製造方法。1. In a method for manufacturing a shoe that is attached to the tip of a concrete pile, (a) a steel plate with a thickness of 4.5 to 9 mm is used as a material, and the central part of the material is not subjected to any special processing, and the surrounding area is (b) A circular flat bottom plate part with the same thickness as the above material and a cylindrical side plate part with a thickness of 2 to 3.2 mm with two groove-shaped recesses in the circumferential direction. and (c) work-hardening the side plate portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18366988A JPS6452918A (en) | 1988-07-25 | 1988-07-25 | Manufacture of tip end shoe of concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18366988A JPS6452918A (en) | 1988-07-25 | 1988-07-25 | Manufacture of tip end shoe of concrete pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6452918A JPS6452918A (en) | 1989-03-01 |
| JPH0378451B2 true JPH0378451B2 (en) | 1991-12-13 |
Family
ID=16139856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18366988A Granted JPS6452918A (en) | 1988-07-25 | 1988-07-25 | Manufacture of tip end shoe of concrete pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6452918A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4511232Y1 (en) * | 1965-10-29 | 1970-05-20 | ||
| JPS5825337U (en) * | 1981-08-14 | 1983-02-17 | 日混工業株式会社 | Prestressed concrete columns |
-
1988
- 1988-07-25 JP JP18366988A patent/JPS6452918A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6452918A (en) | 1989-03-01 |
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