阅读说明：本技术 一种采用法兰连接的防腐管道焊接结构及施工方法 (Anti-corrosion pipeline welding structure adopting flange connection and construction method ) 是由 裴峰 江山 刘锦红 王建平 詹旭 张耀 张凌海 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种采用法兰连接的防腐管道焊接结构及施工方法,包括防腐管道、连接法兰和液态防腐涂料,所述连接法兰固定连接在防腐管道的外端,相邻连接法兰之间固定连接,所述液态防腐涂料设在相邻连接法兰之间；所述连接法兰的内侧法兰面上设有环形注料槽,所述液态防腐涂料位于环形注料槽内。本发明在焊接的对接缝中设置液态防腐涂料对焊接缝进行填充密闭,实现对接缝的防腐密闭,免除了对管道内部对接缝的焊接及修补工作,进而避免了内补口施工困难的缺陷,同时保证整个使用周期内管道的防腐效果,并具有增强管道承压能力的作用。(The invention discloses an anti-corrosion pipeline welding structure adopting flange connection and a construction method, and the anti-corrosion pipeline welding structure comprises an anti-corrosion pipeline, connecting flanges and liquid anti-corrosion paint, wherein the connecting flanges are fixedly connected to the outer ends of the anti-corrosion pipeline, adjacent connecting flanges are fixedly connected, and the liquid anti-corrosion paint is arranged between the adjacent connecting flanges; and an annular material injection groove is formed in the flange surface on the inner side of the connecting flange, and the liquid anticorrosive paint is positioned in the annular material injection groove. According to the invention, the liquid anticorrosive coating is arranged in the welded butt joint to fill and seal the welded joint, so that the anticorrosive seal of the butt joint is realized, the welding and repairing work of the butt joint in the pipeline is avoided, the defect of difficult construction of an inner joint is further avoided, the anticorrosive effect of the pipeline in the whole service cycle is ensured, and the function of enhancing the pressure bearing capacity of the pipeline is achieved.)

1. An anti-corrosion pipeline welding structure adopting flange connection is characterized by comprising an anti-corrosion pipeline (1), connecting flanges (2) and liquid anti-corrosion paint (3), wherein the connecting flanges (2) are fixedly connected to the outer ends of the anti-corrosion pipeline (1), adjacent connecting flanges (2) are fixedly connected, and the liquid anti-corrosion paint (3) is arranged between the adjacent connecting flanges (2);

an annular material injection groove (21) is formed in the flange face on the inner side of the connecting flange (2), and the liquid anticorrosive paint (3) is located in the annular material injection groove (21).

2. The welded structure of corrosion-resistant pipelines adopting flange connection as claimed in claim 1, wherein: the material injection holes (22) and the exhaust holes (23) are formed in the connecting flanges (2), and the material injection holes (22) and the exhaust holes (23) are respectively formed in the two adjacent connecting flanges (2).

3. The welded structure of corrosion-resistant pipelines adopting flange connection as claimed in claim 1, wherein: an annular placing groove (24) is formed in the flange surface on the inner side of the connecting flange (2), and a heat-resistant adhesive tape (25) is arranged in the annular placing groove (24).

4. The welded structure of corrosion-resistant pipelines adopting flange connection as claimed in claim 1, wherein: and a heat-resistant adhesive tape (25) is arranged in the annular material injection groove (21), and the heat-resistant adhesive tape (25) is positioned in the liquid anticorrosive coating (3).

5. The welded structure of corrosion-resistant pipelines adopting flange connection as claimed in claim 2, wherein: annotate material hole (22) and establish in the bottom of flange (2), the outer end is established on the outside flange face of flange (2), and inner and annular notes silo (21) intercommunication, establish at flange (2) top in exhaust hole (23), and the outer end is established on the outside flange face of flange (2), and inner and annular notes silo (21) intercommunication, be equipped with the plug on exhaust hole (23).

6. The welded structure of corrosion-resistant pipelines adopting flange connection as claimed in claim 1, wherein: and the inner wall and the outer wall of the anti-corrosion pipeline (1) are both provided with anti-corrosion coatings, and the outer wall of the connecting flange (2) is provided with the anti-corrosion coatings.

7. The welded structure of corrosion-resistant pipelines adopting flange connection as claimed in claim 1, wherein: connecting flange (2) welded connection is in anticorrosive pipeline (1) outer end, and adjacent connecting flange (2) are through welded connection, and the welding seam outside is equipped with anticorrosive coating.

8. The welded structure of corrosion-resistant pipelines adopting flange connection as claimed in claim 2, wherein: the annular placing groove (24) is positioned on the outer side of the annular material injection groove (21).

9. The method for constructing a welded structure of corrosion-resistant pipes using flange coupling according to any one of claims 1 to 8, comprising the steps of:

s1, component preassembly: welding the connecting flange (2) on the anti-corrosion pipeline (1), and coating an anti-corrosion coating on a non-contact surface to finish the preassembly of a component;

s2, assembling the components: placing the heat-resistant rubber strips (25) in corresponding grooves, then splicing two adjacent members, and extruding and compressing the heat-resistant rubber strips (25);

s3, welding the components: butting the connecting flanges (2) on the adjacent members, and then welding the adjacent connecting flanges (2);

s4, paint injection: after welding is finished, injecting the liquid anticorrosive paint (3) into the material injection hole (22) until the liquid anticorrosive paint (3) overflows from the exhaust hole (23), and then plugging the exhaust hole (23) by using a plug;

s5, shape repairing: trimming the welding seam on the connecting flange (2), and then coating the anticorrosive coating again at the trimmed position;

s6, continuous construction: and (5) sequentially welding and repairing the components according to the steps S2-S5 until the whole anti-corrosion pipeline is welded.

10. The construction method of the welded structure of the corrosion-resistant pipeline adopting the flange connection as claimed in claim 9, wherein: when the heat-resistant adhesive tape (25) is placed in the step S2 and the heat-resistant adhesive tape (25) is placed in the annular material injection groove (21), the liquid anticorrosive paint (3) is coated on the heat-resistant adhesive tape (25) and then placed in the annular material injection groove (21).

Technical Field

The invention relates to the technical field of pipeline corrosion prevention, in particular to a welding structure of a corrosion-resistant pipeline connected by flanges and a construction method.

Background

When the pipeline is applied to the fields of drainage, oil transportation, water injection, sea underwater and the like, anticorrosive treatment is generally needed, but the pipeline which has been subjected to anticorrosive treatment is welded and connected, the welding high temperature can influence the anticorrosive layer on the inner wall and the outer wall of the pipeline, so that the anticorrosive layer is seriously damaged, and an anticorrosive fault is formed inside and outside the pipeline, therefore, a weld joint needs to be repaired after welding, when the weld joint outside the pipeline is repaired, the operation is simple, but the operation is difficult when the inner patch is repaired, for a small-diameter pipeline, when personnel cannot enter, equipment is needed to be repaired, but the repairing effect of the equipment cannot be effectively guaranteed, and further the anticorrosive performance of the inner patch cannot be up to standard, therefore, when the anticorrosive pipeline which needs to be welded is treated, if the anticorrosive problem at the inner patch is solved, the anticorrosive treatment is difficult. The invention provides an anti-corrosion pipeline welding structure adopting flange connection and a construction method thereof, which are used for solving the problems.

Disclosure of Invention

The invention provides an anti-corrosion pipeline welding structure adopting flange connection and a construction method, which can be used for avoiding internal repaired ports and corresponding repairing operation, effectively improving the anti-corrosion effect and reducing the operation difficulty.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an anti-corrosion pipeline welding structure adopting flange connection comprises an anti-corrosion pipeline, connecting flanges and liquid anti-corrosion paint, wherein the connecting flanges are fixedly connected to the outer ends of the anti-corrosion pipeline, adjacent connecting flanges are fixedly connected, and the liquid anti-corrosion paint is arranged between the adjacent connecting flanges;

and an annular material injection groove is formed in the flange surface on the inner side of the connecting flange, and the liquid anticorrosive paint is positioned in the annular material injection groove.

Furthermore, the connecting flanges are provided with material injection holes and exhaust holes, and the material injection holes and the exhaust holes are respectively arranged on the two adjacent connecting flanges.

Furthermore, an annular placing groove is formed in the flange surface on the inner side of the connecting flange, and a heat-resistant adhesive tape is arranged in the annular placing groove.

Furthermore, a heat-resistant adhesive tape is arranged in the annular material injection groove and is positioned in the liquid anticorrosive coating.

Furthermore, the material injection holes are formed in the bottom of the connecting flange, the outer ends of the material injection holes are formed in the outer flange face of the connecting flange, the inner ends of the material injection holes are communicated with the annular material injection groove, the exhaust holes are formed in the top of the connecting flange, the outer ends of the exhaust holes are formed in the outer flange face of the connecting flange, the inner ends of the exhaust holes are communicated with the annular material injection groove, and the exhaust holes are provided with screw plugs.

Furthermore, the inner wall and the outer wall of the anti-corrosion pipeline are both provided with anti-corrosion coatings, and the outer wall of the connecting flange is provided with the anti-corrosion coatings.

Furthermore, flange welded connection passes through welded connection in anticorrosive pipeline outer end, adjacent flange, and the welding seam outside is equipped with anticorrosive coating.

Further, the annular placing groove is located on the outer side of the annular injecting groove.

A construction method of an anti-corrosion pipeline welding structure adopting flange connection comprises the following steps:

s1, component preassembly: welding the connecting flange on the anti-corrosion pipeline, and coating an anti-corrosion coating on the non-contact surface to finish the pre-installation of the component;

s2, assembling the components: placing the heat-resistant rubber strips in corresponding grooves, then splicing two adjacent members, and extruding and compressing the heat-resistant rubber strips;

s3, welding the components: butting the connecting flanges on the adjacent members, and then welding the adjacent connecting flanges;

s4, paint injection: after welding, injecting liquid anticorrosive paint into the material injection hole until the liquid anticorrosive paint overflows from the exhaust hole, and then plugging the exhaust hole by using a screwed plug;

s5, shape repairing: trimming the welding seam on the connecting flange, and then coating the anticorrosive coating on the trimmed part again;

s6, continuous construction: and (5) sequentially welding and repairing the components according to the steps S2-S5 until the whole anti-corrosion pipeline is welded.

Further, when the heat-resistant adhesive tape is placed in the annular material injection groove in step S2, the liquid anticorrosive paint is first applied to the heat-resistant adhesive tape, and then the heat-resistant adhesive tape is placed in the annular material injection groove.

The invention has the following beneficial effects:

the liquid anticorrosive coating is arranged in the welded butt joint to fill and seal the welded joint, so that the anticorrosive sealing of the butt joint is realized, the welding and repairing work of the butt joint in the pipeline is avoided, the defect of difficult construction of an inner joint is further avoided, the anticorrosive effect of the pipeline in the whole service cycle is ensured, and the function of enhancing the pressure bearing capacity of the pipeline is realized;

the flange is welded on the outer side, and the heat-resistant adhesive tape is arranged to isolate the heat influence in the welding process, so that the influence on the anticorrosive coating on the inner wall of the pipeline is prevented from being damaged, and the anticorrosive performance of the inner wall is not influenced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 3 is a schematic diagram of a third embodiment of the present invention;

fig. 4 is an enlarged view of the part a in fig. 3.

Reference numerals: 1-anticorrosion pipeline, 2-connecting flange, 21-annular material injection groove, 22-material injection hole, 23-exhaust hole, 24-annular placement groove, 25-heat-resistant adhesive tape and 3-liquid anticorrosion paint.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

As shown in fig. 1, 2 and 3, an anticorrosion pipeline welded structure adopting flange connection comprises an anticorrosion pipeline 1, a connecting flange 2 and a liquid anticorrosion paint 3, wherein the connecting flange 2 is fixedly connected to the outer end of the anticorrosion pipeline 1, adjacent connecting flanges 2 are fixedly connected, and the liquid anticorrosion paint 3 is arranged between the adjacent connecting flanges 2; an annular material injection groove 21 is formed in the flange surface on the inner side of the connecting flange 2, and the liquid anticorrosive paint 3 is located in the annular material injection groove 21.

As shown in fig. 1 and 2, furthermore, the connecting flange 2 is provided with a material injection hole 22 and an air exhaust hole 23, and the material injection hole 22 and the air exhaust hole 23 are respectively arranged on two adjacent connecting flanges 2

As shown in fig. 2, an annular placement groove 24 is further provided on the inner flange surface of the connecting flange 2, and a heat-resistant rubber strip 25 is provided in the annular placement groove 24.

As shown in fig. 3 and 4, a heat-resistant rubber strip 25 is further arranged in the annular material injection groove 21, and the heat-resistant rubber strip 25 is located in the liquid anticorrosive paint 3.

As shown in fig. 1, in the first embodiment of the present invention, two ends of an anticorrosion pipeline 1 are provided with connecting flanges 2, an annular material injection groove 21 is provided on the connecting flanges 2, a material injection hole 22 and an exhaust hole 23 are provided on the annular material injection groove 21, and a liquid anticorrosion paint 3 is provided in the annular material injection groove 21. In this embodiment, the liquid anticorrosive paint 3 is injected through the injection hole 22 to perform internal corrosion prevention of the joint. The principle of the first embodiment is as follows: during the welding, the welding position is located the flange 2 outside, and is less to the anticorrosive coating influence of 1 inner wall of anticorrosive pipeline, pours into liquid anticorrosive paint 3 into simultaneously after the welding is accomplished, and liquid anticorrosive paint 3 flows by oneself and carries out closely knit to the seam, realizes the anticorrosive effect to whole seam.

As shown in fig. 2, in the second embodiment of the present invention, two ends of an anticorrosion pipeline 1 are provided with connecting flanges 2, each connecting flange 2 is provided with an annular material injection groove 21 and an annular placement groove 24, each annular placement groove 24 is provided outside the annular material injection groove 21, each annular material injection groove 21 is provided with a material injection hole 22 and an exhaust hole 23, the annular material injection groove 21 is internally provided with a liquid anticorrosion paint 3, and the annular placement groove 24 is internally provided with a heat-resistant adhesive tape 25. The principle of the second embodiment is as follows: during welding, the welding position is positioned outside the connecting flange 2, the influence on the anticorrosive coating on the inner wall of the anticorrosive pipeline 1 is small, and the heat-resistant adhesive tape 25 is placed in the annular placing groove 24 before welding; heat-resisting adhesive tape 25 plays thermal-insulated effect when the welding, plays the guard action to anticorrosive coating on anticorrosive pipeline 1 inner wall, pours into liquid anticorrosive paint 3 into simultaneously after the welding is accomplished, and liquid anticorrosive paint 3 flows by oneself and carries out closely knit to the seam, realizes the anticorrosive effect to whole seam.

In the embodiment, the two ends are injected with the liquid anticorrosive coating 3 through the material injection holes 22 to carry out corrosion prevention on the inside of the joint, and the heat-resistant adhesive tape 25 is utilized to isolate high temperature during welding, so that the influence on an anticorrosive coating on the inner wall of the pipeline is avoided.

As shown in fig. 3 and 4, in the third embodiment of the present invention, the two ends of the anticorrosive pipeline 1 are provided with the connecting flanges 2, the connecting flanges 2 are provided with the annular placing groove 21, the annular placing groove 21 is provided with the heat-resistant adhesive tape 25, the periphery of the heat-resistant adhesive tape 25 is coated with the liquid anticorrosive paint 3, the annular placing groove 21 is not provided with the material injection hole 22 and the exhaust hole 23, the liquid anticorrosive paint 3 is coated on the heat-resistant adhesive tape 25 first, then the heat-resistant adhesive tape 25 is placed, and the annular placing groove 21 is filled with the liquid anticorrosive paint 3 by mutual extrusion of the connecting flanges 2. In the embodiment, the heat-resistant adhesive tape 25 coated with the liquid anticorrosive paint 3 is placed in the annular placing groove 21 before welding, and then welding is performed; the heat-proof performance of the heat-resistant adhesive tape 25 is utilized to act on the liquid anticorrosive coating 3 and the anticorrosive coating on the inner wall of the pipeline, the damage to the anticorrosive coating and the liquid coating caused by high temperature during welding is avoided, and meanwhile, the liquid anticorrosive coating 3 flows automatically to closely ensure the anticorrosive performance of the butt joint, and the operation difficulty is effectively reduced.

As shown in fig. 1, further, the material injection hole 22 is formed in the bottom of the connecting flange 2, the outer end of the material injection hole is formed in the outer flange surface of the connecting flange 2, the inner end of the material injection hole is communicated with the annular material injection groove 21, the exhaust hole 23 is formed in the top of the connecting flange 2, the outer end of the material injection hole is formed in the outer flange surface of the connecting flange 2, the inner end of the material injection hole is communicated with the annular material injection groove 21, and the exhaust hole 23 is provided with.

Preferably, the plug and the vent 23 are welded or sealed by paint.

Furthermore, the inner wall and the outer wall of the anti-corrosion pipeline 1 are both provided with anti-corrosion coatings, and the outer wall of the connecting flange 2 is provided with the anti-corrosion coatings.

Preferably, flange 2 welded connection is in 1 outer end of anticorrosive pipeline, and adjacent flange 2 is through welded connection, and the welding seam outside is equipped with anticorrosive coating.

Preferably, the coating method of the anticorrosive coatings on the connecting flange 2 and the anticorrosive pipeline 1 comprises the following steps: the high-performance epoxy powder coating is formed by spraying powder and solidifying after being heated to 230 ℃, and then the liquid anticorrosive coating 3 is additionally coated on the inner side and the outer side of the welding line after the connecting flange 2 and the anticorrosive pipeline 1 are welded.

As shown in fig. 2, the annular placing groove 24 is preferably located outside the annular injection groove 21.

Preferably, the liquid anticorrosive paint 3 is a liquid high-performance solvent-free epoxy anticorrosive paint.

Preferably, the material of the anti-corrosion pipeline 1 and the material of the connecting flange 2 are carbon steel.

A construction method of an anti-corrosion pipeline welding structure adopting flange connection comprises the following steps:

s1, component preassembly: welding the connecting flange 2 on the anti-corrosion pipeline 1, and coating an anti-corrosion coating on a non-contact surface to finish the pre-installation of a component;

s2, assembling the components: placing the heat-resistant rubber strips 25 in corresponding grooves, then splicing two adjacent members, and extruding and compressing the heat-resistant rubber strips 25;

s3, welding the components: butting the connecting flanges 2 on the adjacent members, and then welding the adjacent connecting flanges 2;

s4, paint injection: after welding, injecting the liquid anticorrosive paint 3 into the material injection hole 22 until the liquid anticorrosive paint 3 overflows from the exhaust hole 23, and plugging the exhaust hole 23 by using a plug;

s5, shape repairing: trimming the welding seam on the connecting flange 2, and then coating the anticorrosive coating again at the trimmed position;

s6, continuous construction: and (5) sequentially welding and repairing the components according to the steps S2-S5 until the whole anti-corrosion pipeline is welded.

Further, when the heat-resistant adhesive tape 25 is placed in the step S2, and when the heat-resistant adhesive tape 25 is placed in the annular material injection groove 21 in the third embodiment, the liquid anticorrosive paint 3 is coated on the heat-resistant adhesive tape 25, and then the heat-resistant adhesive tape is placed in the annular material injection groove 21; in the second embodiment, the heat-resistant rubber strip 25 is placed in the annular placement groove 24, and then the heat-resistant rubber strip 25 is fixed by pressing the attachment flange 2.

Preferably, in step S3, the duct is cooled using a wet tissue when the member is welded.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.