JPH07336B2 - Anticorrosion coating method for PC strand - Google Patents
Anticorrosion coating method for PC strandInfo
- Publication number
- JPH07336B2 JPH07336B2 JP63042581A JP4258188A JPH07336B2 JP H07336 B2 JPH07336 B2 JP H07336B2 JP 63042581 A JP63042581 A JP 63042581A JP 4258188 A JP4258188 A JP 4258188A JP H07336 B2 JPH07336 B2 JP H07336B2
- Authority
- JP
- Japan
- Prior art keywords
- strand
- mandrel
- synthetic resin
- tube
- flow path
- 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 - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/06—Rod-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、プレストレストコンクリート（以下PCと記
す）の緊張材として使用するPCストランドの防錆被覆方
法に関する。TECHNICAL FIELD The present invention relates to a rust preventive coating method for PC strands used as a tension material for prestressed concrete (hereinafter referred to as PC).
（従来の技術） 従来、PC鋼材からなる線状材を撚り合わせたPCストラン
ドが使用されており、このPCストランドは鋼製シース内
に挿通して使用されている。(Prior Art) Conventionally, a PC strand obtained by twisting linear materials made of PC steel has been used, and the PC strand is used by being inserted into a steel sheath.
近年、この種のPCストランドを使用したPC構造物におい
て、その性能の低下の原因としてPCストランドの腐蝕が
問題視され、鋼製シースを使用する場合にもそのシース
内にグリース等の防錆剤をグラウトとして使用したり、
合成樹脂シートを使用したものには予めシース内にグリ
ースを充填した所謂アンボンドストランドが使用される
に至った。In recent years, in a PC structure using this type of PC strand, corrosion of the PC strand has been regarded as a problem as a cause of its performance deterioration, and even when using a steel sheath, a rust preventive agent such as grease is included in the sheath. Can be used as a grout,
So-called unbonded strands, in which the sheath is filled with grease in advance, have come to be used for those using the synthetic resin sheet.
（発明が解決しようとする課題） しかし、このような従来の防錆方法では、当初からシー
スに傷があったり、後に損傷したりして防水が完全でな
い場合には、PCストランドの完全な防錆を数十年にも亘
って維持することができるか否かが問題であった。この
ため、PCストランド自体に直接防錆塗装を施す等の防錆
方法も考えられるが、塗装の場合、ピンホールが生じ易
く、これを防止するために厚い被覆層を形成すると、材
料費が多く要するとともに均一な厚さの被覆を形成する
ためには多工程を要し、コスト高となる等の問題があっ
た。(Problems to be Solved by the Invention) However, in such a conventional rust prevention method, when waterproofness is not perfect due to scratches on the sheath or damage to the sheath from the beginning, complete protection of the PC strands is not possible. The problem was whether rust could be maintained for decades. Therefore, rust prevention methods such as directly applying rust prevention coating to the PC strand itself are conceivable, but in the case of coating, pinholes are likely to occur, and if a thick coating layer is formed to prevent this, the material cost will be high. In addition to this, there are problems that multiple steps are required to form a coating having a uniform thickness, resulting in high cost.
本発明は、このような従来の問題に鑑み、薄くてピンホ
ールがなく、しかも強力な接着が得られ、完全な耐蝕性
被覆が低コストにて簡単に得られるPCストランドの防錆
被覆方法の提供を目的としたものである。In view of such a conventional problem, the present invention is a thin and no pinhole, yet strong adhesion is obtained, and a complete corrosion-resistant coating is easily obtained at a low cost. It is intended to be provided.
（問題点を解決するための手段） 上述の如き従来の問題を解決し、所期の目的を達成する
本発明のPCストランドの防錆被覆方法は、中心にPCスト
ランド挿通孔を有するテーパ状の心金と、該心金の外側
にチューブ状をした溶融樹脂流動路を隔てて同心位置に
設けた口金とを有する樹脂押出成型機を使用し、前記心
金内に予熱したPCストランドを連続して挿通するととも
に前記溶融樹脂流動路より接着性を有する熱可塑性合成
樹脂材料を略均一な肉厚の円筒チューブ状に押し出し、
かつ、その押し出された合成樹脂チューブ内を前記心金
を通して減圧させて該合成樹脂チューブを前記PCストラ
ンドを外面に該PCストランドの外形形状がそのまま表わ
れるように、一定の厚さの層状に密着させることを特徴
としている。(Means for Solving Problems) The above-mentioned conventional problems are solved, and the anticorrosion coating method of the PC strand of the present invention which achieves the intended purpose is a tapered shape having a PC strand insertion hole at the center. Using a resin extrusion molding machine having a mandrel and a die provided concentrically with a molten resin flow path having a tubular shape on the outside of the mandrel, and continuously preheated PC strands in the mandrel And extruding a thermoplastic synthetic resin material having adhesiveness from the molten resin flow path into a cylindrical tube having a substantially uniform thickness,
In addition, the extruded synthetic resin tube is decompressed through the mandrel, and the synthetic resin tube is adhered in a layered form with a constant thickness so that the outer shape of the PC strand appears as it is on the outer surface of the PC strand. The feature is to let.
（作用） このPCストランドの防錆被覆方法は、心金と口金との間
に形成されるチューブ状をした溶融樹脂流動路より加熱
溶融した合成樹脂材料が、チューブ状に押し出され、そ
の中心に予熱されたPCストランドが連続して挿通され
る。そして心金内を通して溶融状態にある合成樹脂チュ
ーブ内を減圧することにより、内部の空気が引き抜か
れ、縮径されてPCストランドの外面にその外形形状に対
応して密着し、一定厚さの層状にPCストランドの外面を
被覆し、自らの接着性によってPCストランドに接着され
る。(Function) This PC strand rust-proof coating method is a synthetic resin material that is heated and melted from a tube-shaped molten resin flow path formed between the core and the die is extruded into a tube shape The preheated PC strands are continuously inserted. Then, by depressurizing the molten synthetic resin tube through the core metal, the internal air is drawn out, the diameter is reduced and the PC strand is adhered to the outer surface according to its outer shape, and a layered layer with a certain thickness is formed. The outer surface of the PC strand is covered with and adhered to the PC strand by its own adhesiveness.
（実施例） 次に本発明の実施の一例を図面について説明する。(Example) Next, an example of an embodiment of the present invention will be described with reference to the drawings.
第１図は本発明において使用する樹脂押出成型機を示し
ており、同図中11は成型機のクロスヘッド、12は材料押
出用のスクリューである。クロスヘッド11には、スクリ
ュー12と交差する向きにマンドレル13が後端側から挿入
され、そのマンドレル13の先端に心金14が固定されてい
る。FIG. 1 shows a resin extrusion molding machine used in the present invention. In the figure, 11 is a crosshead of the molding machine and 12 is a screw for material extrusion. A mandrel 13 is inserted into the crosshead 11 from the rear end side in a direction intersecting with the screw 12, and a mandrel 14 is fixed to the tip of the mandrel 13.
心金14の先端部は、クロスヘッド11の先端側から挿入し
固定された口金15内に挿入され、その口金15は口金ホル
ダ16を介してクロスヘッド11の先端に固定されている。The tip portion of the mandrel 14 is inserted into a fixed base 15 inserted from the front end side of the crosshead 11, and the base 15 is fixed to the front end of the crosshead 11 via a base holder 16.
マンドレル13の先端部外周には、スクリュー11によって
溶融樹脂が押し出される溶融樹脂流動路17が形成されて
いる。心金14は中心にPCストランド挿通孔14aが貫通開
口され、外面が先細り状のテーパー状をなしている。口
金15は心金14と略同じ角度のテーパー状のテーパ孔18が
形成され、心金14の外面と口金15の内面との間にテーパ
チューブ状をした溶融樹脂流動路19が形成されている。
この流動路19は、マンドレル13の外側からスクリュー12
に通じており、スクリュー12によって押し出される溶融
合成樹脂材料が口金15内よりチューブとなって押し出さ
れるようになっている。A molten resin flow path 17 through which the molten resin is extruded by the screw 11 is formed on the outer periphery of the tip of the mandrel 13. A PC strand insertion hole 14a is opened at the center of the mandrel 14, and the outer surface thereof has a tapered shape. The base 15 is formed with a tapered tapered hole 18 having substantially the same angle as the core 14, and a tapered resin-shaped molten resin flow path 19 is formed between the outer surface of the base 14 and the inner surface of the base 15. .
This flow path 19 is provided from the outside of the mandrel 13 with the screw 12
The molten synthetic resin material extruded by the screw 12 is extruded as a tube from the inside of the die 15.
マンドレル13は、中心にPCストランドガイド孔20が貫通
開口され、クロスヘッ11の後端面から挿入されて固定さ
れている。クロスヘッド11の後端には、マンドレル13の
後端開口部全体を覆う配置に吸気チャンバー21が形成さ
れている。この吸気チャンバー21の後端面にPCストラン
ド導入口22が開口されているとともに、吸気筒23が連通
され、図示しない真空ポンプにより吸気チャンバー21内
を減圧し、これによってマンドレル19及び心金14を通じ
て合成樹脂チューブＡ内が減圧されるようになってい
る。A PC strand guide hole 20 is formed at the center of the mandrel 13, and is fixed by being inserted from the rear end surface of the crosshead 11. An intake chamber 21 is formed at the rear end of the crosshead 11 so as to cover the entire rear end opening of the mandrel 13. A PC strand introduction port 22 is opened at the rear end surface of the intake chamber 21, an intake cylinder 23 is communicated with the intake chamber 21, and the inside of the intake chamber 21 is decompressed by a vacuum pump (not shown). The inside of the resin tube A is decompressed.
またクロスヘッド10の後端側には予熱器24が、先端側に
は冷却器25が設置されている。Further, a preheater 24 is installed on the rear end side of the crosshead 10 and a cooler 25 is installed on the front end side.
このように構成される装置を使用し、第１図に示すよう
にPCストランドＢを予熱器24−−吸気チャンバー21−−
マンドレル13−−心金14−−口金15−−冷却器25の順に
連続して挿通する。そして、スクリュー12より接着性を
有する熱可塑性合成樹脂材料としてポリオレフイン系樹
脂材料を押し出すことにより、心金14と口金15間の流動
路19より合成樹脂チューブＡが押し出され、その内部に
PCストランドＢが挿通された状態となる。また、この押
し出しと同時に吸気チャンバー21内を減圧させると、マ
ンドレル13及び心金14を通じて合成樹脂チューブＡ内が
減圧され、これによってPCストランドＢの外面に合成樹
脂チューブＡが密着され、この状態で冷却器25に通り、
冷却固化されてPCストランドＢの外面に被覆層が形成さ
れる。Using the apparatus constructed as described above, the PC strand B is preheated as shown in FIG.
The mandrel 13 --- the mandrel 14--, the base 15--, and the cooler 25 are continuously inserted in this order. Then, by extruding a polyolefin resin material as a thermoplastic synthetic resin material having an adhesive property from the screw 12, the synthetic resin tube A is extruded from the flow path 19 between the mandrel 14 and the base 15, and inside thereof.
The PC strand B is inserted. When the pressure in the intake chamber 21 is reduced at the same time as this extrusion, the pressure in the synthetic resin tube A is reduced through the mandrel 13 and the mandrel 14, whereby the synthetic resin tube A is brought into close contact with the outer surface of the PC strand B. Pass through cooler 25,
It is cooled and solidified to form a coating layer on the outer surface of the PC strand B.
なお、本実施例では心金14と口金15との関係を第２図に
示すように、先端部に互いに平行になる部分ａを設け、
チューブＡの押し出し時に略完全な円筒状のチューブＡ
を成形し、これを減圧によってPCストランドの外面に密
着させることにより、第３図に示すように外面に螺旋溝
があるPCストランドの外形に対応した形状に均一厚さの
被覆層Ｃが形成されるようにしている。In this embodiment, as shown in FIG. 2, the relationship between the mandrel 14 and the base 15 is provided with portions a which are parallel to each other at the tip end,
When the tube A is extruded, it has a substantially complete cylindrical tube A.
By molding this and bringing it into close contact with the outer surface of the PC strand by depressurization, a coating layer C having a uniform thickness is formed in a shape corresponding to the outer shape of the PC strand having a spiral groove on the outer surface as shown in FIG. I am trying to do it.
なお、本発明は図示のPCストランドの他PC鋼棒やPC鋼線
にも実施できるものである。The present invention can be applied to PC steel rods and PC steel wires in addition to the illustrated PC strands.
（発明の効果） 上記したように、本発明のPCストランドの防錆被覆方法
は、接着性を有する熱可塑性合成樹脂材料を押出成型機
によってチューブ状に押し出し、その合成樹脂チューブ
内を減圧してPCストランドの外形形状がそのまま外面に
表れるようにPCストランドに密着させるようにしたこと
により、PCストランド自体に直接防錆塗装を施す等の防
錆方法よりも均一な厚さでピンホールがなく、しかも強
固に接着された防錆被覆が得られ、耐蝕性被覆が低コス
トにて簡単に得られる。(Effects of the invention) As described above, the anticorrosion coating method of the PC strand of the present invention is a thermoplastic synthetic resin material having adhesiveness extruded into a tube shape by an extruder, and depressurizing the inside of the synthetic resin tube. By making it adhere to the PC strand so that the outer shape of the PC strand appears as it is on the outer surface, there is no pinhole with a more uniform thickness than the rust prevention method such as directly applying rust prevention coating to the PC strand itself, Moreover, a strongly adhered rust preventive coating can be obtained, and a corrosion resistant coating can be easily obtained at low cost.
また、PCストランドの外形形状がそのまま外面に表れる
ように均一な厚さで、熱可塑性合成樹脂が被覆されるこ
とにより、PCストランドをコンクリート内に直接埋設し
て使用する場合にも、より完全な防錆効果が得られるこ
ととなったものである。In addition, even if the PC strand is directly embedded in the concrete and used, the PC strand has a uniform thickness so that the outer shape of the PC strand appears as it is on the outer surface and is coated with a thermoplastic synthetic resin. The anticorrosion effect can be obtained.
第１図は本発明において使用する装置の一例の要部の断
面図、第２図は所定の心金と口金との関係を示す断面
図、第３図は第２図に形成される被覆の例を示す断面図
である。 Ａ……合成樹脂チューブ、Ｂ……PCストランド、Ｃ……
被覆層、11……クロスヘッド、12……スクリュー、13…
…マンドレル、14……心金、15……口金、19……溶融樹
脂流動路、21……吸気チャンバー。FIG. 1 is a sectional view of a main part of an example of an apparatus used in the present invention, FIG. 2 is a sectional view showing a relationship between a predetermined mandrel and a base, and FIG. 3 is a sectional view of a coating formed in FIG. It is sectional drawing which shows an example. A: Synthetic resin tube, B: PC strand, C:
Coating layer, 11 ... Crosshead, 12 ... Screw, 13 ...
… Mandrel, 14… Core, 15… Base, 19… Molten resin flow path, 21… Intake chamber.
Claims (1)
状の心金と、該心金の外側にチューブ状をした溶融樹脂
流動路を隔てて同心配置に設けた口金とを有する樹脂押
出成型機を使用し、前記心金内に予熱したPCストランド
を連続して挿通するとともに前記溶融樹脂流動路より接
着性を有する熱可塑性合成樹脂材料を略均一な肉厚の円
筒チューブ状に押し出し、かつ、その押し出された合成
樹脂チューブ内を前記心金を通して減圧させて該合成樹
脂チューブを前記PCストランドの外面に該PCストランド
の外形形状がそのまま表われるように一定の厚さの層状
に密着させることを特徴としてなるPCストランドの防錆
被覆方法。1. A resin extrusion molding machine having a tapered mandrel having a PC strand insertion hole at the center and a die provided concentrically with a tubular molten resin flow path separated from the mandrel. Using, extruding a thermoplastic synthetic resin material having an adhesive property from the molten resin flow path into a cylindrical tube having a substantially uniform thickness while continuously inserting a preheated PC strand into the mandrel, and By depressurizing the inside of the extruded synthetic resin tube through the mandrel, the synthetic resin tube is adhered to the outer surface of the PC strand in a layered form having a constant thickness so that the outer shape of the PC strand appears as it is. The characteristic method of anticorrosion coating of PC strands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63042581A JPH07336B2 (en) | 1988-02-25 | 1988-02-25 | Anticorrosion coating method for PC strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63042581A JPH07336B2 (en) | 1988-02-25 | 1988-02-25 | Anticorrosion coating method for PC strand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01215528A JPH01215528A (en) | 1989-08-29 |
| JPH07336B2 true JPH07336B2 (en) | 1995-01-11 |
Family
ID=12640036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63042581A Expired - Lifetime JPH07336B2 (en) | 1988-02-25 | 1988-02-25 | Anticorrosion coating method for PC strand |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07336B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0656441B1 (en) * | 1993-12-02 | 1998-07-15 | HIEN ELECTRIC INDUSTRIES, Ltd. | PC strand coated with rust inhibitor and method for producing the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4978893A (en) * | 1972-12-08 | 1974-07-30 | ||
| JPS50143866A (en) * | 1974-05-09 | 1975-11-19 | ||
| JPS51113178A (en) * | 1975-03-28 | 1976-10-06 | Hitachi Cable Ltd | Method of manufacturing bridged polyolefine cable |
| JPS52121069A (en) * | 1976-04-05 | 1977-10-12 | Nippon Barukaa Kougiyou Kk | Method of producing thermoplastic resin string containing core wire |
-
1988
- 1988-02-25 JP JP63042581A patent/JPH07336B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01215528A (en) | 1989-08-29 |
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