焊接后内防腐层免修补的内环氧外 3PE 防腐管道及其制备工艺
Inner epoxy outer 3PE anticorrosive pipeline without internal repair of inner coating after welding and preparation process thereof
焊接后内防腐层免修补的内环氧外 3PE 防腐管道及其制备工艺 Inner epoxy outer 3PE anticorrosive pipeline without internal repair of inner coating after welding and preparation process thereof
技术领域 Technical field
本发明涉及一种防腐管道，适用于内环氧外 3PE 防腐管道，尤其适用于焊接后内防腐层免修补的内环氧外 3PE
防腐管道，具体地说，涉及一种焊接后内防腐层免修补的内环氧外 3PE 防腐管道及其制备工艺。 The invention relates to an anticorrosive pipeline, which is suitable for an inner epoxy 3PE anticorrosive pipeline, and is especially suitable for an inner epoxy outer 3PE which is not repaired after welding.
The anticorrosive pipe, in particular, relates to an inner epoxy outer 3PE anticorrosive pipe which is not repaired after welding, and a preparation process thereof.
背景技术 Background technique
防腐管道管线施工采用焊接连接方式，管端在焊接时存在长度为 60 ～ 100mm
3PE 防腐管道良好的防腐蚀性能受到瓶颈制约。 Internal epoxy 3PE for transporting fluids (drinking water, industrial water, sea water and various gases)
The anti-corrosion pipeline pipeline construction adopts the welding connection method, and the pipe end has a length of 60 to 100 mm during welding.
In the heat affected zone of the left and right, the inner anti-corrosion coating needs to be repaired after the welding is completed. The anti-corrosion performance of the secondary repair section cannot achieve the same performance of the pipe, and is limited to DN800.
For the above pipe diameters, the medium and small diameter pipelines cannot be repaired by manual work, and there is no problem of the inner anti-corrosion layer in the heat-affected zone. The pipeline forms anti-corrosion defects in the heat affected zone of the welding, and the pipeline is prone to accidents such as rust, perforation and bursting in the section.
The good corrosion resistance of 3PE anti-corrosion pipes is subject to bottlenecks.
发明内容 Summary of the invention
50 年以上。 The technical problem to be solved by the present invention is to provide an inner epoxy outer 3PE which is repair-free after the inner anti-corrosion layer is repaired.
Anti-corrosion pipeline, solving the prior art DN800
After the secondary repair of the above-mentioned pipe diameter, the anti-corrosion performance of the coating in the heat-affected zone is poor and there is no anti-corrosion layer in the heat-affected zone of the small- and medium-diameter anti-corrosion pipe. After the anti-corrosion pipe of the invention is used, no repair work is required, and the inner wall of the anti-corrosion pipe is not required. It has a complete continuous and consistent internal anti-corrosion layer. The anti-corrosion performance of the heat-affected zone is good, and the service life is long, at least
More than 50 years.
防腐管道的制备工艺，适应性广，无论管径大小均可实现内防腐层的连贯性； The invention also provides an inner epoxy outer 3PE which is repair-free after the inner anti-corrosion layer is welded.
The preparation process of the anti-corrosion pipeline has wide adaptability, and the consistency of the inner anti-corrosion layer can be achieved regardless of the diameter of the pipeline;
管道焊接后无需对热影响区进行内防腐层的修补作业，具有工艺简单、易操作、费用低廉、安全系数高的优点； After the pipeline is welded, it is not necessary to repair the inner anti-corrosion layer in the heat-affected zone, and has the advantages of simple process, easy operation, low cost and high safety factor;
采用本发明的制备工艺，防腐管道管线施工效率高且质量好。 With the preparation process of the invention, the anti-corrosion pipeline pipeline has high construction efficiency and good quality.
防腐管道，包括管道本体，其特征在于：所述管道本体端部设有管端构件。 In order to solve the above technical problem, the technical solution of the present invention is: the inner epoxy outer layer 3PE which is not repaired after the inner anti-corrosion layer is welded.
The anticorrosive pipe comprises a pipe body, wherein the pipe body end is provided with a pipe end member.
一种优化方案，所述管端构件贴合在管道本体的内壁形成环状。 In an optimized solution, the pipe end member is attached to the inner wall of the pipe body to form an annular shape.
另一种优化方案，所述管端构件的外侧超出管道本体端部 2 ～ 3mm 。 In another optimization, the outer side of the pipe end member is 2 to 3 mm beyond the end of the pipe body.
再一种优化方案，所述管端构件内外两侧及对接处封闭焊接。 In another optimization scheme, the inner and outer sides of the pipe end member and the butt joint are closed and welded.
进一步的优化方案，所述管端构件呈长条状。 In a further optimization, the tube end member is elongated.
再进一步的优化方案，所述管端构件为不锈钢板材。 In a further optimization, the tube end member is a stainless steel sheet.
防腐管道的制备工艺，其特征在于：所述制备工艺包括组对装配步骤。 The invention also provides an inner epoxy outer 3PE which is repair-free after the inner anti-corrosion layer is welded.
A process for preparing an anticorrosive pipe, characterized in that the preparation process comprises a pairwise assembly step.
一种优化方案，所述组对装配步骤包括：将管端构件安装在管道本体内部，其外侧超出管道本体端面 2 ～ 3mm
，并用膨胀工装将管端构件压接在管道本体内壁上。 An optimization solution, the group pair assembly step comprises: installing the pipe end member inside the pipe body, the outer side of which is beyond the end face of the pipe body 2 to 3 mm
And crimping the pipe end member to the inner wall of the pipe body with an expansion tooling.
另一种优化方案，所述制备工艺还包括复合焊接步骤。 In another preferred embodiment, the preparation process further includes a composite welding step.
In another optimization scheme, the welding step includes: performing closed welding along the inner and outer sides of the pipe end member and the butting joint to form a continuous weld formed by the outer weld seam, the inner weld seam and the butt joint weld seam, and the weld seam is extended. To the end face of the pipe body, the pipe end member forms a firm and complete composite body with the pipe body.
The invention adopts the above technical solution, and has the following advantages compared with the prior art: a double metal structure is pre-composited on the inner wall of the end portion of the pipe body, and then the anti-corrosion treatment is performed, and the anti-corrosion layer, the metal structure and the pipe wall are tightly combined to form a Complete continuous, consistent performance inner coating, internal epoxy
After the completion of the welding construction, the 3PE anti-corrosion pipeline will not affect the internal anti-corrosion layer and does not require the internal anti-corrosion layer repair operation.
本发明采用双金属预制与焊接相结合的方式，将耐腐蚀性的金属板材用环形可膨胀工装压接在管端内部，且板材外侧超出管端 2 ～ 3mm
The invention adopts the combination of bimetal prefabrication and welding, and the corrosion resistant metal plate is crimped into the inside of the pipe end by the annular expandable tooling, and the outer side of the plate exceeds the pipe end by 2 to 3 mm.
After the welding is completed, a composite body with anti-corrosion performance is formed at the end of the pipe body, which can adapt to the production process of the existing various steel-plastic composite pipes.
The bimetal composite has good welding performance. The pipeline welding can be carried out by the existing method. After welding, the inner coating naturally forms integrity and consistency, completely avoiding the secondary repair of the inner coating and the inability to repair. The overall pipeline quality is degraded, the life is shortened, and the repairing problems of cumbersome operation, high cost, and safety risks of construction workers are solved;
、内防腐层一次成型，无需修补，端部采用的耐腐蚀性的金属板材焊接的模式，大大地提高了防腐管道的性能，延长使用寿命，至少达到 50 年以上。 2
The inner anti-corrosion layer is formed at one time without repairing, and the corrosion-resistant metal sheet welding mode adopted at the end greatly improves the performance of the anti-corrosion pipeline and prolongs the service life, at least 50 years.
下面结合附图和实施例对本发明进行详细说明。 The invention will now be described in detail in conjunction with the drawings and embodiments.
附图 1 是本发明实施例中管端构件的结构示意图； 1 is a schematic structural view of a pipe end member in an embodiment of the present invention;
附图 2 是本发明实施例中防腐管道的制备状态结构示意图； 2 is a schematic structural view showing a state of preparation of an anticorrosive pipe in an embodiment of the present invention;
附图 3 是本发明实施例中防腐管道管端的结构示意图。 Figure 3 is a schematic view showing the structure of the pipe end of the anticorrosive pipe in the embodiment of the present invention.
图中， In the picture,
1- 管端构件， 2- 管道本体， 3- 膨胀工装， 4- 外侧焊缝， 5- 内侧焊缝， 6-
对接处焊缝。 1- Pipe end member, 2- Pipe body, 3- Expansion tooling, 4- Outside weld, 5- Inside weld, 6-
具体实施方式 detailed description
实施例 1 ，如图 1 、图 2 和图 3 所示，焊接后内防腐层免修补的内环氧外 3PE
防腐管道，包括管道本体 2 ，管道本体 2 为内环氧外 3PE 防腐钢管，管道本体 2 端部设有管端构件 1 ，管端构件 1 呈长条状，管端构件 1
采用不锈钢板材，管端构件 1 贴合在管道本体 2 的内壁形成环状，管端构件 1 与管道本体 2 焊接，管端构件 1 的外侧超出管道本体 2 端部 2 ～
3mm 。 Example 1 , as shown in Fig. 1, Fig. 2 and Fig. 3, the inner epoxy layer 3PE without internal repair of the inner coating after welding
Anti-corrosion pipe, including pipe body 2, pipe body 2 is an inner epoxy 3PE anti-corrosion steel pipe, pipe end member 2 is provided with pipe end member 1 , pipe end member 1 is elongated, pipe end member 1
The stainless steel sheet is used, and the pipe end member 1 is attached to the inner wall of the pipe body 2 to form an annular shape, and the pipe end member 1 is welded to the pipe body 2, and the outer side of the pipe end member 1 is beyond the end portion of the pipe body 2 2
本实施例中的管端构件 1 还可采用具备耐腐蚀性能的其他金属板材。 The pipe end member 1 in this embodiment can also be made of other metal sheets having corrosion resistance.
实施例 2 ，焊接后内防腐层免修补的内环氧外 3PE 防腐管道的制备工艺，包括以下步骤： Example 2: The preparation process of the inner epoxy outer 3PE anticorrosive pipe without internal repair of the inner anticorrosion layer after welding, comprising the following steps:
1 ）管道本体预制。 1) The pipe body is prefabricated.
采用各类成型方式制造的钢管均可作为原材料使用。 Steel pipes manufactured by various molding methods can be used as raw materials.
2 ）管端构件预制。 2) The pipe end member is prefabricated.
具备耐腐蚀性能的金属板材，本实施例中采用不锈钢，经剪切制作成条形。 The metal plate having corrosion resistance is made of stainless steel in this embodiment and is formed into a strip shape by shearing.
3 ）组对装配。 3) Group pair assembly.
将管端构件 1 安装在管道本体 2 内部，其外侧超出管道本体 2 端面 2 ～ 3mm ，并用膨胀工装 3
将管端构件 1 压接在管道本体 2 内壁上。 The pipe end member 1 is installed inside the pipe body 2, and the outer side thereof is beyond the end face of the pipe body 2 by 2 to 3 mm, and the expansion tool is used 3
The pipe end member 1 is crimped onto the inner wall of the pipe body 2.
4 ）复合焊接。 4) Composite welding.
用电焊枪沿管端构件 1 内外两侧及对接处进行封闭焊接，形成由外侧焊缝 4 、内侧焊缝 5 和对接处焊缝 6
构成的连续焊缝，焊缝延伸至管道本体 2 端面，管端构件 1 与管道本体 2 形成牢固、完整的复合体。 The welding torch is welded along the inner and outer sides of the pipe end member 1 and the butt joint to form the weld seam from the outer weld 4, the inner weld 5 and the butt joint 6
The continuous weld is formed, and the weld extends to the end face of the pipe body 2, and the pipe end member 1 forms a firm and complete composite with the pipe body 2.
The above is an example of a preferred embodiment of the present invention, and parts that are not described in detail are common knowledge of those skilled in the art. The scope of the present invention is defined by the scope of the claims, and any equivalent transformation based on the teachings of the present invention is also within the scope of the present invention.