JPH02121837A - Manufacture of plastic-coated steel sheet-pile - Google Patents
Manufacture of plastic-coated steel sheet-pileInfo
- Publication number
- JPH02121837A JPH02121837A JP27517788A JP27517788A JPH02121837A JP H02121837 A JPH02121837 A JP H02121837A JP 27517788 A JP27517788 A JP 27517788A JP 27517788 A JP27517788 A JP 27517788A JP H02121837 A JPH02121837 A JP H02121837A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- coating layer
- steel sheet
- coating
- plastic
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 229920003023 plastic Polymers 0.000 title claims abstract description 20
- 239000004033 plastic Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000011247 coating layer Substances 0.000 claims abstract description 74
- 239000010410 layer Substances 0.000 claims abstract description 39
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 26
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 18
- 239000000853 adhesive Substances 0.000 claims abstract description 17
- 230000001070 adhesive effect Effects 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 10
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 abstract description 12
- 238000000576 coating method Methods 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000009966 trimming Methods 0.000 abstract description 4
- 229920000098 polyolefin Polymers 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 239000011342 resin composition Substances 0.000 abstract description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
- -1 polyethylene Polymers 0.000 description 6
- 238000011282 treatment Methods 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229920005862 polyol Polymers 0.000 description 3
- 150000003077 polyols Chemical class 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 150000001244 carboxylic acid anhydrides Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000004982 aromatic amines Chemical class 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、プラスチック被覆鋼矢板の製造方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a plastic-coated steel sheet pile.
［従来の技術］
鋼矢板は、港湾整備における護岸工事、海洋構造物、汚
砂流出入防止壁等の土木、建築用資材として広く使用さ
れている。これら用途に使用される鋼矢板は、海水、雨
水等にさらされると共に。[Prior Art] Steel sheet piles are widely used as civil engineering and construction materials for seawall construction in port development, marine structures, walls to prevent sludge inflow and outflow, and the like. Steel sheet piles used for these purposes are exposed to seawater, rainwater, etc.
酸素、太陽光が介在した腐食環境の基で使用されるにも
かかわらず、長年月に亘る耐久性が要求される。Even though it is used in a corrosive environment with oxygen and sunlight, it is required to be durable for many years.
近年、耐久性の向上を目的として、プラスチック被覆鋼
矢板が開発された。この鋼矢板は、継手嵌合部を除く基
板上に、２から５ｍの厚さにポリエチレン樹脂等のプラ
スチックを被覆したものである。しかし、この鋼矢板は
、被覆層自体の性質は良好であるが、被覆層の側端部に
おいては、被覆層と基板との間に段差が形成されるので
、運搬や打設時に作用する外力や、海中での使用におい
ては、建込み後の海洋生物の付着、成長によって、被覆
層が基板から浮き上がって剥離するおそれがあった。In recent years, plastic-coated steel sheet piles have been developed with the aim of improving durability. This steel sheet pile is made by coating the substrate, excluding the joint fitting portion, with a plastic such as polyethylene resin to a thickness of 2 to 5 m. However, although the properties of the coating layer itself are good in this steel sheet pile, there are steps formed between the coating layer and the substrate at the side edges of the coating layer, so external forces that act during transportation and pouring In addition, when used underwater, there is a risk that the coating layer will lift off and peel off from the substrate due to the attachment and growth of marine organisms after construction.
上述した問題を解決するために、特開昭６０−２７５１
９号公報には、次のような鋼矢板が開示されている。即
ち、この鋼矢板は、第４図に示すように、基板１と、基
板１の継手部以外の表面上に、接着剤２を介して形成さ
れた、プラスチックからなる被覆層３と、継手部ＩＡの
表面上に、被覆層３の端部とラップさせて形成された、
プラスチックからなるシール被覆Ｍ４とからなっている
。In order to solve the above-mentioned problem, Japanese Patent Application Laid-Open No. 60-2751
Publication No. 9 discloses the following steel sheet piles. That is, as shown in FIG. 4, this steel sheet pile has a base plate 1, a coating layer 3 made of plastic formed on the surface of the base plate 1 other than the joint part via an adhesive 2, and a joint part. formed on the surface of the IA by wrapping with the end of the coating layer 3,
It consists of a seal covering M4 made of plastic.
シール被覆層４は、継手部１＾および被覆層３の側端部
と熱的に接着されている。以下、この鋼矢板を従来技術
１と云う。The seal covering layer 4 is thermally bonded to the joint portion 1^ and the side end portions of the covering layer 3. Hereinafter, this steel sheet pile will be referred to as prior art 1.
次に、特開昭６０−２３３２３２号公報には、次のよう
な鋼矢板が開示されている。即ち、この鋼矢板は、第５
図に示すように、基板１と、基板１の継手部以外の表面
上に、接着剤２を介して形成された、プラスチックから
なる被覆層３とからなり、被覆層３の側端部は、シール
材５によってシールされている。以下、この鋼矢板を従
来技術２という。Next, Japanese Unexamined Patent Publication No. 60-233232 discloses the following steel sheet pile. In other words, this steel sheet pile is the fifth
As shown in the figure, it consists of a substrate 1 and a coating layer 3 made of plastic formed on the surface of the substrate 1 other than the joint portion via an adhesive 2, and the side edges of the coating layer 3 are It is sealed with a sealing material 5. Hereinafter, this steel sheet pile will be referred to as prior art 2.
［発明が解決しようとする課題］ しかし、従来技術１は、次のような問題を有している。[Problem to be solved by the invention] However, prior art 1 has the following problems.
即ち、シール被覆層４を、継手部ＩＡおよび被覆層３の
側端部に熱的に接着させるために、接着対象面を高温に
加熱する必要があるが、シール被覆層４はその膜厚が薄
いので、熱による変形や破断が生じやすく、且つ、しわ
による空気の巻込みが生じて、密着性が悪い。That is, in order to thermally bond the seal coating layer 4 to the joint portion IA and the side edges of the coating layer 3, it is necessary to heat the surface to be bonded to a high temperature. Since it is thin, it is easily deformed or broken due to heat, and air is trapped due to wrinkles, resulting in poor adhesion.
一方、従来技術２は、次のような問題を有している。即
ち、シール材６を断面が三角形状によるようにヘラ等に
よって成形する必要があり、頻雑な作業が強いられる。On the other hand, Prior Art 2 has the following problems. That is, it is necessary to use a spatula or the like to shape the sealing material 6 so that the cross section has a triangular shape, which requires frequent work.
しかも、基板１の表面と、被覆Ｍ３の側端部面とがほぼ
直角であるので、シール材５と被覆Ｎ３との間に空気が
浸入しやすい。Moreover, since the surface of the substrate 1 and the side end surface of the coating M3 are substantially perpendicular to each other, air easily enters between the sealing material 5 and the coating N3.
従って、この発明の目的は、被覆層の側端部の剥離や空
気の巻込みを防止するための処理が容易且つ確実に行え
る、プラスチック被覆鋼矢板の製造方法を提供すること
にある。Accordingly, an object of the present invention is to provide a method for manufacturing a plastic-coated steel sheet pile, which can easily and reliably perform treatments to prevent peeling of the side edges of the coating layer and air entrainment.
［課題を解決するための手段］
この発明は、接着性熱可塑性プラスチック層と熱可塑性
プラスチック層とからなる第２被覆層を連続的に製造し
、次いで、前記第２被覆層の側端部をテーパー状に加工
し、次いで、予熱された鋼矢板用基板の継手嵌合部を除
く表面上に、前記第２被覆層を圧着し、そして、前記第
２被覆層の側端部と前記基板との間にシール被覆層を帯
状に形成することからなり、必要に応じて、前記基板の
表面と前記第２被覆層との間に熱硬化性プラスチックか
らなる第１被覆層が形成されていることに特徴を有する
ものである。[Means for Solving the Problems] The present invention continuously manufactures a second coating layer consisting of an adhesive thermoplastic layer and a thermoplastic layer, and then removes side edges of the second coating layer. The second coating layer is pressed onto the surface of the steel sheet pile substrate that has been processed into a tapered shape and then preheated, excluding the joint fitting portion, and the side edges of the second coating layer and the substrate are bonded together. A sealing coating layer is formed in a band shape between the substrate and the second coating layer, and if necessary, a first coating layer made of thermosetting plastic is formed between the surface of the substrate and the second coating layer. It has the following characteristics.
次に、この発明の、プラスチック被覆鋼矢板の製造方法
の一実施態様を図面を参照しながら説明する。Next, one embodiment of the method for manufacturing plastic-coated steel sheet piles according to the present invention will be described with reference to the drawings.
第１図は、この発明の、プラスチック被覆鋼矢板の製造
方法の一実施態様を示す工程図、第２図および第３図は
、この発明によって製造された鋼矢板の部分断面図であ
る。FIG. 1 is a process diagram showing one embodiment of the method for manufacturing plastic-coated steel sheet piles according to the present invention, and FIGS. 2 and 3 are partial sectional views of the steel sheet piles manufactured according to the present invention.
搬送ロール６によって、長さ方向に連続的に移動する基
板７の表面上に、まず、下地処理装置８によって第１被
ｒＩＩＮ９が形成される。下地処理装置８は、リン酸処
理やクロム酸処理機能を有していても、さらに、乾燥機
能を有していても良い。On the surface of the substrate 7 that is continuously moved in the length direction by the conveyor roll 6, first, the first substrate 9 is formed by the surface treatment device 8. The base treatment device 8 may have a phosphoric acid treatment or chromic acid treatment function, and may also have a drying function.
基板７の表面は、ショツトブラスト、グリッドブラスト
等によって、予め除錆処理が施されている。The surface of the substrate 7 has been previously subjected to rust removal treatment by shot blasting, grid blasting, or the like.
第１被覆層９は、後述する第２被覆層の被覆面積より広
範囲に亘って基板７を被覆し、基板７と後述する第２被
覆層およびシール被覆層とを密着させる作用を有する。The first coating layer 9 covers the substrate 7 over a wider area than the second coating layer, which will be described later, and has the function of bringing the substrate 7 into close contact with the second coating layer and the seal coating layer, which will be described later.
第１被覆層９は、脂肪族アミン、芳香族アミン、酸無水
物、ポリアミド、イミダゾール等によって導びかれた有
機グループを有する硬化剤によって、分子量がおよそ３
００から４０００程度のエポキシ樹脂を硬化させたもの
や、ポリオールあるいはエポキシ樹脂等で変性したポリ
オールを、イソシアネートによって硬化させたものから
なる熱硬化性プラスチックによって構成されている。The first coating layer 9 is made of a curing agent having an organic group derived from an aliphatic amine, aromatic amine, acid anhydride, polyamide, imidazole, etc., and has a molecular weight of approximately 3.
It is made of a thermosetting plastic made of a hardened epoxy resin of about 0.00 to 4000, or a polyol or a polyol modified with an epoxy resin, etc., hardened with an isocyanate.
第１被ｒ１Ｍ９を基板７の表面上に被覆するには、基板
７の形状に合わせた複数個の分割ローラ群によって、基
板７の中心部から両端に向って順次圧着する方法が適当
であり、この方法によれば、基板７の長手方向に対して
、第１被覆層９を連続的に形成することができる。In order to cover the surface of the substrate 7 with the first coating r1M9, it is appropriate to apply pressure sequentially from the center of the substrate 7 to both ends using a plurality of divided roller groups that match the shape of the substrate 7. According to this method, the first coating layer 9 can be formed continuously in the longitudinal direction of the substrate 7.
次に、第１被覆層９が形成された基板７は、加熱装置１
０によって加熱される。これは、熱硬化性プラスチック
からなる第１被覆層９を硬化させるため、および、後述
する第２被覆暦の接着性熱可塑性プラスチック層を溶融
させるためである。Next, the substrate 7 on which the first coating layer 9 has been formed is heated by the heating device 1.
heated by 0. This is to harden the first coating layer 9 made of thermosetting plastic, and to melt the adhesive thermoplastic layer of the second coating, which will be described later.
この加熱温度は、接着性熱可塑性プラスチック層の融点
以上の温度である。例えば、第２被覆層の熱可塑性プラ
スチック層がポリエチレンからなり。This heating temperature is higher than the melting point of the adhesive thermoplastic layer. For example, the thermoplastic layer of the second covering layer is made of polyethylene.
そして、接着性熱可塑性プラスチック層が無水カルボン
酸グラフト変性ポリエチレンからなる場合には、基板７
を１３０℃以上、好ましくは、１５０℃以上に加熱する
。When the adhesive thermoplastic layer is made of carboxylic anhydride graft modified polyethylene, the substrate 7
is heated to 130°C or higher, preferably 150°C or higher.
次に、加熱された基板７の第１被覆層９の表面上に、接
着性熱可塑性プラスチック層１１および熱可塑性プラス
チック層１２からなる第２被覆層１３が圧着装置１５に
よって被覆される。第２被覆層１３の側端部は、第２被
覆層１３が第１被覆層９の表面上に被覆される前に、ト
リミング装置１４によって、テーパ状にカットされる。Next, on the surface of the first coating layer 9 of the heated substrate 7, a second coating layer 13 consisting of an adhesive thermoplastic layer 11 and a thermoplastic layer 12 is coated by a pressure bonding device 15. The side edges of the second covering layer 13 are cut into a tapered shape by a trimming device 14 before the second covering layer 13 is coated on the surface of the first covering layer 9.
テーパ角度は、３０から４５度が好ましい。第２被覆層
され易すくするためである。第２被覆層１３を、接着性
熱可塑性プラスチック層１１および熱可塑性プラスチッ
ク層１２の２層構造にしたのは、これらプラスチック層
１１．１２を別々に被覆するときに生じる被覆範囲のず
れや段差およびプラスチック層１１．１２間への空気の
巻込みを防止するためである。熱可塑性プラスチックと
は、低密度から高密度までの各種ポリエチレン、ポリプ
ロピレン、エチレン−酢酸ビニル共重合体等のポリオレ
フィンや塩化ビニル、ポリアミド、ポリエステルあるい
はこれらのブレンドや変性体を含む組成物の総称である
。そして、接着性熱可塑性プラスチックとは、前記熱可
塑性プラスチックと基板表面を熱的に接着させるために
用いるもので、カルボン酸あるいは無水カルボン酸をグ
ラフト重合したポリオレフィン系プラスチック等の組成
物が適用できる。熱可塑性プラスチックおよび接着性熱
可塑性プラスチックは、Ｔダイを用いた溶融押出し法に
よって、容易に所定の膜厚の第２被Ｆｉ層１３に成形す
ることができる。第２被覆層１３の膜厚は、鋼矢板の衝
撃性等の機械的強度、吸水性、電気絶縁性等を考慮して
、１ｍ以上、好ましくは、２ｍｍ以上にすると良い。The taper angle is preferably 30 to 45 degrees. This is to make it easier to apply the second coating layer. The reason why the second coating layer 13 has a two-layer structure of the adhesive thermoplastic plastic layer 11 and the thermoplastic plastic layer 12 is to prevent deviations and steps in the coating range that occur when these plastic layers 11 and 12 are coated separately. This is to prevent air from being trapped between the plastic layers 11 and 12. Thermoplastics is a general term for compositions containing polyolefins ranging from low density to high density such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, vinyl chloride, polyamide, polyester, or blends or modified products thereof. . The adhesive thermoplastic is used to thermally bond the thermoplastic to the substrate surface, and a composition such as a polyolefin plastic obtained by graft polymerizing carboxylic acid or carboxylic anhydride can be used. The thermoplastic plastic and the adhesive thermoplastic plastic can be easily molded into the second Fi layer 13 having a predetermined thickness by a melt extrusion method using a T-die. The thickness of the second coating layer 13 is preferably 1 m or more, preferably 2 mm or more, taking into consideration mechanical strength such as impact resistance of the steel sheet pile, water absorption, electrical insulation, etc.
次に、第２被覆層１３が形成された基板７は、冷却装置
１６によって冷却される。Next, the substrate 7 on which the second coating layer 13 is formed is cooled by the cooling device 16.
次に、第２被覆層１３の側端部と第１被覆層９との表面
上に、シール被覆層１７が塗装機１８によって被覆され
る。シール被覆層１７は、第１被覆層９の側端部に、水
、海水、酸素等が接触するのを防止する作用、第１被覆
層９の側端部に作用する外力を緩衝する作用、および、
鋼矢板の継手嵌合部の防食作用を有する。シール被覆層
１７は、反応硬化性のウレタン樹脂組成物等の、未反応
状態では液状であり、硬化後にある程度の柔軟性を有す
る塗料組成物からなっており、この塗料が、塗装機１８
からスプレーされる。シール被覆層１７の膜厚は、鋼矢
板の継手嵌合性および第１被覆層９の側端部の保護作用
を考慮して、０．１ から１ｍ、好ましくは、０．２
から０．５ｍｍの範囲内が良い。Next, the seal coating layer 17 is coated on the side edges of the second coating layer 13 and the surfaces of the first coating layer 9 by the coating machine 18 . The seal coating layer 17 has the function of preventing water, seawater, oxygen, etc. from coming into contact with the side edges of the first coating layer 9, the function of buffering external forces acting on the side edges of the first coating layer 9, and,
It has a corrosion-preventing effect on the joint fitting part of steel sheet piles. The seal coating layer 17 is made of a coating composition such as a reactively curable urethane resin composition, which is liquid in an unreacted state and has a certain degree of flexibility after curing.
sprayed from. The thickness of the seal coating layer 17 is 0.1 to 1 m, preferably 0.2 m, taking into account the fitability of the steel sheet pile to the joint and the protective effect on the side edges of the first coating layer 9.
A range of 0.5 mm is preferable.
このようにして、基板７の表面上に、第１．第２および
シール被覆Ｊｌ１９，１３．１７が被覆されたものから
なる鋼矢板１９が連続的に製造される。In this way, the first . Steel sheet piles 19 coated with the second and seal coating Jl 19, 13.17 are manufactured continuously.
次に、この発明の実施例について説明する。Next, embodiments of the invention will be described.
長さ１２ｍのＵ型鋼矢板を基板として、プラスチック被
覆鋼矢板を、第１図に示す工程に従って製造した。Using a 12 m long U-shaped steel sheet pile as a substrate, a plastic-coated steel sheet pile was manufactured according to the process shown in FIG. 1.
予め、ショツトブラスト処理を施した基板７の表面上に
、下地処理装置８によって、アミン硬化型エポキシ粉体
樹脂を約２００μｍの厚さにコーティングした。The surface of the substrate 7, which had been shot blasted in advance, was coated with an amine-curable epoxy powder resin to a thickness of about 200 μm using the base treatment device 8.
次いで、基板７を加熱装置１０によって２００℃に加熱
して、前記樹脂を硬化させた。このようにし−て、基板
７の表面上に、第１被覆層９を形成した。Next, the substrate 7 was heated to 200° C. by the heating device 10 to cure the resin. In this way, the first coating layer 9 was formed on the surface of the substrate 7.
次いで、無水マレイン酸グラフト変性ポリエチレン（融
点１２３℃）と高密度ポリエチレン（融点１２８℃）と
をＴダイから同時に押出して、０．３■厚の接着性熱可
塑性プラスチック層と２．０■厚の熱可塑性プラスチッ
ク層とを積層したものからなる２層構造の第２被覆層１
３を製造し、この第２被覆層１３の両側端部をトリミン
グ装！！１４によって４５度にトリミングした。この第
２被覆層１３を２００℃に加熱されている第１被覆層９
の表面上に圧着袋＠１５によって圧着し、次いで、基板
７を水冷式の冷却装置１６によって室温まで冷却した。Next, maleic anhydride-grafted modified polyethylene (melting point 123°C) and high-density polyethylene (melting point 128°C) were extruded simultaneously through a T-die to form a 0.3-inch thick adhesive thermoplastic plastic layer and a 2.0-inch thick adhesive thermoplastic layer. A second coating layer 1 having a two-layer structure consisting of a laminated thermoplastic plastic layer.
3, and trimming the both ends of this second coating layer 13! ! 14 to 45 degrees. This second coating layer 13 is heated to 200°C.
Then, the substrate 7 was cooled to room temperature by a water-cooled cooling device 16.
次に、第２被覆層１３の側端部および第１被覆層９の表
面上に、ポリオールを芳香族イソシアネートで硬化させ
たウレタンエラストマーを、塗装機１８によって０．３
■厚にスプレーして、前記表面上に帯状にシール被覆層
１７を形成した。Next, on the side edges of the second coating layer 13 and the surface of the first coating layer 9, a urethane elastomer made by curing polyol with an aromatic isocyanate is applied to
(2) A seal coating layer 17 was formed in a band shape on the surface by thick spraying.
このようにして製造したプラスチック被覆鋼矢板を調べ
たところ、シール被覆層１７は、第２被覆層１３の側端
面全長に亘ってほぼ均一の幅および厚さで形成されてい
た。そして、ピンホールの発生、空気の巻込み等の欠陥
は発見されなかった。When the plastic-coated steel sheet pile manufactured in this manner was examined, it was found that the seal coating layer 17 was formed with a substantially uniform width and thickness over the entire length of the side end surface of the second coating layer 13. No defects such as pinholes or air entrainment were found.
次に、上記鋼矢板と同様のものを２枚製造し、そのうち
の１枚を打設試験に供した。即ち、バイブロハンマーに
よって鋼矢板を地中に打設し、次いで、これを引き抜き
、そして、鋼矢板の表面をＩ！察した。この結果、第２
被覆層１３の表面に深さ４０μｍ以下の摩擦疵がほぼ前
面についていたものの、第２被覆層の側端部に損爆、剥
離は全く生じていなかった。Next, two sheets similar to the above steel sheet piles were manufactured, and one of them was subjected to a casting test. That is, a steel sheet pile is driven into the ground with a vibrohammer, then pulled out, and the surface of the steel sheet pile is I! I guessed it. As a result, the second
Although there were friction scratches with a depth of 40 μm or less on almost the front surface of the coating layer 13, no explosion damage or peeling occurred at the side edges of the second coating layer.
次に、残りの１枚の鋼矢板を海洋ａｍ試験に供した。即
ち、鋼矢板を干満帯に位置するように海岸に立て掛け、
２年間暴露し、そして、鋼矢板の表面を観察した。この
結果、シール被覆［１７に破壊、変形は全く見られず、
そして、第２被覆暦１３の側端部は完全に保護されてお
り５発錆、剥離は全く発見されなかった。Next, the remaining steel sheet pile was subjected to a marine AM test. In other words, steel sheet piles are placed against the coast so that they are located in the tidal zone,
After being exposed for two years, the surface of the steel sheet pile was observed. As a result, no breakage or deformation was observed in the seal coating [17].
The side edges of the second coating 13 were completely protected, and no rust or peeling was found at all.
次に、比較のために、第２被覆層１３の側端部をテーパ
ー加工しなかった以外は、上述した実施例と同様の方法
に従って比較鋼矢板を製造し、その表面を観察した。こ
の結果、シール被覆層１７は均一に形成されておらず、
一部に空気の巻込みが見られた０次に、実施例と同様に
して、打設試験を行い、鋼矢板の表面をＩ！察した。こ
の結果。Next, for comparison, a comparative steel sheet pile was manufactured in the same manner as in the above-mentioned Example, except that the side end portion of the second coating layer 13 was not tapered, and its surface was observed. As a result, the seal coating layer 17 is not formed uniformly,
A pouring test was carried out in the same manner as in the example, and the surface of the steel sheet pile was I! I guessed it. As a result.
第２被覆層１３の側端部に深さ３００μｍを超える疵が
見られ、一部に剥離を生じていた。さらに。A flaw with a depth of more than 300 μm was observed at the side edge of the second coating layer 13, and some peeling occurred. moreover.
実施例と同様にして、海洋暴露試験を行い、鋼矢板の表
面を観察した。この結果、第２被覆層の側端部の一部に
剥離が認められた。A marine exposure test was conducted in the same manner as in the example, and the surface of the steel sheet piles was observed. As a result, peeling was observed at a portion of the side edge portion of the second coating layer.
［発明の効果］
以上説明したように、この発明によれば、被覆層側端部
の剥離や空気の巻込みが生じず、しかも。[Effects of the Invention] As explained above, according to the present invention, peeling of the end portion of the coating layer and entrainment of air do not occur.
被覆層側端部を予めテーパー状に加工するために、従来
のような頻雑な作業を行う必要がないなど有用な効果が
もたらされる。Since the end portion of the covering layer side is processed into a tapered shape in advance, useful effects such as eliminating the need for frequent operations as in the conventional method are brought about.
第Ｌｗｉは、この発明の、プラスチック被覆鋼矢板の製
造方法の一実施態様を示す工程図、第２図および第３図
は、この発明によって製造された鋼矢板の部分断面図、
第４図および第５図は、従来の鋼矢板の部分断面図であ
る０図面において、ｌ・・・基板、 ２・・
・接着剤。
３・・被覆層、 ４・・・シール被ＮＷＪ、５
・・・シール材、 ６・・・搬送ロール、７・・
・基板、 ８・・・下地処理装置、９・・・
第１被覆層、 １０・・・加熱装置。
１１・・・接着性熱可塑性プラスチック層。
１２・・・熱可塑性プラスチック層、
１３・・・第２被覆層、 １４・・・トリミング装
置。
Ｉ５・・・圧着装置、１６・・・冷却装置、１７・・・
シール被覆層、 １８・・・塗装機、１９・・・鋼矢
板。No. Lwi is a process diagram showing one embodiment of the method for manufacturing plastic-coated steel sheet piles of the present invention, and FIGS. 2 and 3 are partial cross-sectional views of the steel sheet piles manufactured according to the present invention.
4 and 5 are partial cross-sectional views of conventional steel sheet piles.
·glue. 3...Covering layer, 4...NWJ to be sealed, 5
... Seal material, 6... Conveyance roll, 7...
・Substrate, 8... Base treatment device, 9...
1st coating layer, 10... heating device. 11...Adhesive thermoplastic plastic layer. 12... Thermoplastic plastic layer, 13... Second coating layer, 14... Trimming device. I5...Crimping device, 16...Cooling device, 17...
Seal coating layer, 18... Painting machine, 19... Steel sheet pile.
Claims (1)
ック層とからなる第２被覆層を連続的に製造し、次いで
、前記第２被覆層の側端部をテーパー状に加工し、次い
で、予熱された鋼矢板用基板の継手嵌合部を除く表面上
に、前記第２被覆層を圧着し、そして、前記第２被覆層
の側端部と前記基板との間にシール被覆層を帯状に形成
することからなることを特徴とする、プラスチック被覆
鋼矢板の製造方法。 ２ 前記基板の表面と前記第２被覆層との間に熱硬化性
プラスチックからなる第１被覆層が形成されていること
を特徴とする、第１項記載のプラスチック被覆鋼矢板の
製造方法。[Claims] 1. A second coating layer consisting of an adhesive thermoplastic layer and a thermoplastic layer is continuously produced, and then the side edges of the second coating layer are processed into a tapered shape, Next, the second coating layer is crimped onto the surface of the preheated steel sheet pile substrate excluding the joint fitting portion, and a seal coating layer is provided between the side edge of the second coating layer and the substrate. A method for manufacturing a plastic-coated steel sheet pile, characterized by forming the plastic-coated steel sheet pile into a belt shape. 2. The method for manufacturing a plastic-coated steel sheet pile according to item 1, wherein a first coating layer made of thermosetting plastic is formed between the surface of the substrate and the second coating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275177A JPH072397B2 (en) | 1988-10-31 | 1988-10-31 | Method for manufacturing plastic coated steel sheet pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275177A JPH072397B2 (en) | 1988-10-31 | 1988-10-31 | Method for manufacturing plastic coated steel sheet pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02121837A true JPH02121837A (en) | 1990-05-09 |
| JPH072397B2 JPH072397B2 (en) | 1995-01-18 |
Family
ID=17551744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63275177A Expired - Fee Related JPH072397B2 (en) | 1988-10-31 | 1988-10-31 | Method for manufacturing plastic coated steel sheet pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH072397B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007321363A (en) * | 2006-05-30 | 2007-12-13 | Nippon Steel Corp | Painted steel sheet pile excellent in coupling part corrosion resistance and method of manufacturing it |
| JP2011064020A (en) * | 2009-09-18 | 2011-03-31 | Jfe Steel Corp | Steel sheet pile and steel sheet pile continuous wall |
| JP2018001546A (en) * | 2016-06-30 | 2018-01-11 | 新日鐵住金株式会社 | Steel pipe coated with three layers of polyolefin resin having end shape excellent in peel resistance |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6027519A (en) * | 1983-07-26 | 1985-02-12 | Nippon Steel Corp | Anticorrosive coated steel pile |
-
1988
- 1988-10-31 JP JP63275177A patent/JPH072397B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6027519A (en) * | 1983-07-26 | 1985-02-12 | Nippon Steel Corp | Anticorrosive coated steel pile |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007321363A (en) * | 2006-05-30 | 2007-12-13 | Nippon Steel Corp | Painted steel sheet pile excellent in coupling part corrosion resistance and method of manufacturing it |
| JP2011064020A (en) * | 2009-09-18 | 2011-03-31 | Jfe Steel Corp | Steel sheet pile and steel sheet pile continuous wall |
| JP2018001546A (en) * | 2016-06-30 | 2018-01-11 | 新日鐵住金株式会社 | Steel pipe coated with three layers of polyolefin resin having end shape excellent in peel resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH072397B2 (en) | 1995-01-18 |
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