Reinforced anti-corrosion and anti-seepage joint coating structure of direct-buried plastic sleeve steel heat supply pipeline

Abstract

The utility model relates to the field of heat supply pipelines, and provides a reinforced anti-corrosion and anti-seepage joint coating structure for a directly-buried plastic sleeve steel heat supply pipeline, which comprises an inner-layer fluorosilicon resin winding belt, a polyurethane heat preservation layer, an electric hot melting sleeve and an outer-layer fluorosilicon resin winding belt, according to the utility model, the electric hot melting sleeve is used as a protective sleeve, and the outer fluorosilicon resin winding belt is sleeved on the periphery of the electric hot melting sleeve, so that the problems in the prior art are solved, and the selected anticorrosive coating layer meets the requirements on the adhesive force of the steel pipe and the adhesive force of the PE outer protective pipe, and has good acid and alkali resistance; the rubber water stop strip is arranged between the electric hot melting sleeve and the outer-layer fluorosilicone resin winding belt, so that the sealing performance is effectively improved; and the installation is simpler and more efficient.

Description

Technical Field

[0001] The utility model relates to the field of heating pipelines, in particular to a directly buried plastic-sheathed steel heating pipeline reinforced anti-corrosion and anti-seepage patching structure. Background Art

[0002] The quality of heating pipe network technology is the key to the success or failure of the entire heating system. At present, most urban heating pipes in my country use plastic (PE) sheathed steel structures, and are insulated by filling polyurethane foam inside. In actual applications, plastic sheathed steel pipes frequently break at the joints, and their service life is far from meeting the design requirements. The consequences are: the heating pipe network cannot operate normally, causing losses to heating companies and users, and even causing adverse social impacts. Through analysis, the main causes of this problem include free acid release from polyurethane foam and acidic substances produced by hydrolysis of polyurethane foam after water seepage, which corrode the steel pipe and intergranular corrosion at the weld.

[0003] At present, there is a gap in the effective technology to fundamentally solve the corrosion and leakage of pipelines in the heating industry. Most of the processes used are anti-corrosion and anti-seepage treatments for electric hot melt sleeves or heat shrinkable tapes. After a period of time, the electric hot melt sleeves or heat shrinkable tapes are prone to cracking, and water seepage causes corrosion. The main reasons are:

[0004] (1) The PE outer protective pipe material of the plastic-sheathed steel is a difficult-to-bond material. There is a weak boundary layer on the PE surface, which is chemically inert, making it difficult for hot melt adhesive to bond to the PE outer protective pipe;

[0005] (2) The PE outer protective pipe is out of round, the fit is insufficient during welding, and it is prone to cracking due to long-term shear force, causing larger-scale water seepage. Utility Model Content

[0006] The utility model proposes a directly buried plastic-sheathed steel heating pipeline reinforced anti-corrosion and anti-seepage patching structure, which solves the problems existing in the prior art by adopting an electric hot-melt sleeve as a protective sleeve and simultaneously sheathing an outer layer of fluorosilicone resin winding tape on the outer peripheral side of the electric hot-melt sleeve. The selected anti-corrosion coating layer meets the adhesion requirements of the steel pipe and the PE outer protective pipe and has good acid and alkali resistance. A rubber water stop strip is installed between the electric hot-melt sleeve and the outer layer of fluorosilicone resin winding tape to effectively improve the sealing. The installation is also simpler and more efficient.

[0007] The technical solution of the utility model is achieved in this way:

[0008] A reinforced anti-corrosion and anti-seepage patching structure for a directly buried plastic-sheathed steel heating pipeline, the heating pipeline comprising: a first insulation pipe and a second insulation pipe, the first insulation pipe and the second insulation pipe are connected by a weld, and the patching structure is installed on the weld;

[0009] The patching structure comprises an inner layer of fluorosilicone resin winding tape, a polyurethane insulation layer, an electric hot melt sleeve and an outer layer of fluorosilicone resin winding tape;

[0010] The inner layer of fluorosilicone resin wrapping tape is coated on the outer peripheral side of the weld;

[0011] The first insulation pipe includes a first steel pipe and a first PE outer protective pipe, the second insulation pipe includes a second steel pipe and a second PE outer protective pipe, the first steel pipe and the second steel pipe are connected by the weld, and the electric hot melt sleeve is simultaneously sleeved on the first PE outer protective pipe and the second PE outer protective pipe; the electric hot melt sleeve is provided with an axial opening, and the axial opening of the electric hot melt sleeve and the left and right sides connected to the first PE outer protective pipe and the second PE outer protective pipe are connected by electric fusion welding;

[0012] The electric hot melt sleeve is connected to the inner circumference of the first PE outer protective pipe and the second PE outer protective pipe and forms a heat-insulating space between the first steel pipe and the second steel pipe; the polyurethane heat-insulating layer is located in the heat-insulating space;

[0013] The outer fluorosilicone resin wrapping tape is coated on the outer peripheral side of the electric heat-melting sleeve;

[0014] The electric hot melt sleeve is provided with an injection hole for injecting the polyurethane insulation layer.

[0015] Furthermore, the inner fluorosilicone resin winding tape and the outer fluorosilicone resin winding tape both include carbon fiber cloth and a first fluorosilicone anticorrosive coating layer that is simultaneously sprayed or brushed on the carbon fiber cloth.

[0016] Furthermore, the end surface of the polyurethane thermal insulation layer is sprayed or brushed with a second fluorosilicone anti-corrosion coating layer.

[0017] Furthermore, a rubber water stop strip is installed between the electric hot melt sleeve and the outer fluorosilicone resin winding belt.

[0018] Furthermore, the inner layer of fluorosilicone resin wrapping tape is wrapped around the outer peripheral side of the weld and extends outward by 200 mm.

[0019] Furthermore, both ends of the outer fluorosilicone resin winding belt are fastened with PE plastic steel belts.

[0020] Furthermore, the outer fluorosilicone resin wrapping tape is coated on the outer circumference of the electric hot melt sleeve and extends outward by 200 mm.

[0021] Furthermore, a cover sheet or a plug is installed on the injection hole.

[0022] The utility model solves the problems existing in the prior art by adopting an electric hot melt sleeve as a protective sleeve and simultaneously sleeves an outer fluorosilicone resin winding belt on the outer peripheral side of the electric hot melt sleeve. The selected anti-corrosion coating layer meets the adhesion requirements of the steel pipe and the PE outer protective pipe and has good acid and alkali resistance. A rubber water stop strip is installed between the electric hot melt sleeve and the outer fluorosilicone resin winding belt to effectively improve the sealing performance. The installation is also simpler and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a structural cross-sectional view of a reinforced anti-corrosion and anti-seepage patching structure for a direct-buried plastic-sheathed steel heating pipeline in a specific embodiment of the utility model;

[0025] Figure 2 It is a structural schematic diagram of a direct-buried plastic-sheathed steel heating pipeline reinforced anti-corrosion and anti-seepage patching structure when the injection hole matches the cover plate in a specific embodiment of the utility model;

[0026] Figure 3 It is a structural schematic diagram of a directly buried plastic-sheathed steel heating pipeline reinforced anti-corrosion and anti-seepage patching structure when the injection hole is matched and blocked in a specific embodiment of the utility model;

[0027] Explanation of the reference numerals: first insulation pipe 1; first steel pipe 11; first PE outer protective pipe 12; second insulation pipe 2; second steel pipe 21; second PE outer protective pipe 22; weld 3; inner layer fluorosilicone resin winding tape 4; polyurethane insulation layer 5; electric hot melt sleeve 6; injection hole 61; cover plate 62; plug 63; rubber water stop strip 7; outer layer fluorosilicone resin winding tape 8; PE plastic steel tape 9. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3A reinforced anti-corrosion and anti-seepage patching structure for a directly buried plastic-jacketed steel heating pipeline, the heating pipeline comprising: a first insulation pipe 1 and a second insulation pipe 2, the first insulation pipe 1 and the second insulation pipe 2 are connected by a weld, and the patching structure is installed on the weld 3; before patching, within 200mm on both sides of the weld, a highly permeable fluorosilicone anti-corrosion coating with composite zinc phosphate is sprayed or brushed once with a thickness of 70μm to penetrate into the material to be anti-corroded to form a dense anti-corrosion layer, and observation is made to ensure that the spraying is uniform and without omissions;

[0030] The patch structure comprises an inner fluorosilicone resin wrapping tape 4, a polyurethane insulation layer 5, an electric hot melt sleeve 6 and an outer fluorosilicone resin wrapping tape 8;

[0031] The inner layer of fluorosilicone resin wrapping tape 4 is coated on the outer peripheral side of the weld 3. After spraying both sides of the weld 3, carbon fiber cloth is used to wrap the weld and both sides for 200 mm, and fluorosilicone anti-corrosion paint is sprayed or brushed simultaneously until the carbon fiber cloth is soaked;

[0032] The first insulation pipe 1 includes a first steel pipe 11 and a first PE outer protective pipe 12, the second insulation pipe 2 includes a second steel pipe 21 and a second PE outer protective pipe 22, the first steel pipe 11 and the second steel pipe 21 are connected by the weld 3, and the electric hot melt sleeve 6 is simultaneously sleeved on the first PE outer protective pipe 12 and the second PE outer protective pipe 22; the electric hot melt sleeve 6 is provided with an axial opening, and the axial opening of the electric hot melt sleeve and the left and right sides connected to the first PE outer protective pipe 12 and the second PE outer protective pipe 22 are connected by electric fusion welding;

[0033] The electric hot melt sleeve 6 connects the inner circumference of the first PE outer protective tube 12 and the second PE outer protective tube 22 with the first steel pipe 11 and the second steel pipe 21 to form a heat preservation space; the polyurethane heat preservation layer 5 is located in the heat preservation space;

[0034] The outer fluorosilicone resin wrapping tape 8 is coated on the outer peripheral side of the electric hot melt sleeve 6, wherein the outer fluorosilicone resin wrapping tape 8 can be replaced by a heat shrink sleeve, and the outer fluorosilicone resin wrapping tape 8 or the heat shrink sleeve is used to wrap the entire patch;

[0035] The electric hot melt sleeve 6 is provided with an injection hole 61 for injecting the polyurethane insulation layer.

[0036] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3 The inner fluorosilicone resin winding tape 4 and the outer fluorosilicone resin winding tape 8 both include carbon fiber cloth and a first fluorosilicone anticorrosive coating layer sprayed or brushed on the carbon fiber cloth simultaneously. The first fluorosilicone anticorrosive coating must penetrate the carbon fiber cloth when sprayed or brushed.

[0037] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3 The end face of the polyurethane insulation layer 5 is sprayed or brushed with a second fluorosilicone anti-corrosion coating layer; before patching, the end face of the polyurethane insulation layer in the first insulation pipe 1 and the second insulation pipe 2 is first brushed or sprayed with fluorosilicone anti-corrosion coating to achieve a waterproof and anti-seepage effect, thereby preventing the corrosive medium from penetrating to the far end due to the rupture of the patch.

[0038] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3 A rubber water stop strip 7 is installed between the electric hot melt sleeve 6 and the outer fluorosilicone resin winding belt 8 to improve the sealing performance.

[0039] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3 The inner layer of fluorosilicone resin wrapping tape 4 is wrapped around the outer peripheral side of the weld 3 and extends outward by 200 mm to ensure sealing.

[0040] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3 The two ends of the outer fluorosilicone resin wrapping belt 8 are fastened with PE plastic steel belts 9.

[0041] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3 The outer fluorosilicone resin wrapping tape 8 is wrapped around the outer circumference of the electric hot melt sleeve 6 and extends outward by 200 mm.

[0042] In the specific embodiment 1 of the present utility model, see Figure 1-Figure 3 The injection hole 61 is provided with a cover sheet 62 or a plug 63 .

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A directly buried plastic-sheathed steel heating pipeline reinforced anti-corrosion and anti-seepage patching structure, the heating pipeline comprising: A first insulation pipe and a second insulation pipe, wherein the first insulation pipe and the second insulation pipe are connected by a weld, and the patching structure is installed on the weld; The invention is characterized in that: the patching structure comprises an inner layer of fluorosilicone resin winding tape, a polyurethane insulation layer, an electric hot melt sleeve and an outer layer of fluorosilicone resin winding tape; The inner layer of fluorosilicone resin wrapping tape is coated on the outer peripheral side of the weld; The first insulation pipe includes a first steel pipe and a first PE outer protective pipe, the second insulation pipe includes a second steel pipe and a second PE outer protective pipe, the first steel pipe and the second steel pipe are connected by the weld, and the electric hot melt sleeve is simultaneously sleeved on the first PE outer protective pipe and the second PE outer protective pipe; the electric hot melt sleeve is provided with an axial opening, and the axial opening of the electric hot melt sleeve and the left and right sides connected to the first PE outer protective pipe and the second PE outer protective pipe are connected by electric fusion welding; The electric hot melt sleeve is connected to the inner circumference of the first PE outer protective pipe and the second PE outer protective pipe and forms a heat-insulating space between the first steel pipe and the second steel pipe; the polyurethane heat-insulating layer is located in the heat-insulating space; The outer fluorosilicone resin wrapping tape is coated on the outer peripheral side of the electric heat-melting sleeve; The electric hot melt sleeve is provided with an injection hole for injecting the polyurethane insulation layer.

2. A reinforced anti-corrosion and anti-seepage patching structure for a direct-buried plastic-sheathed steel heating pipeline as claimed in claim 1, characterized in that: The inner fluorosilicone resin winding tape and the outer fluorosilicone resin winding tape both include carbon fiber cloth and a first fluorosilicone anticorrosive coating layer that is simultaneously sprayed or brushed on the carbon fiber cloth.

3. A reinforced anti-corrosion and anti-seepage patching structure for a direct-buried plastic-sheathed steel heating pipeline as claimed in claim 1, characterized in that: The end surface of the polyurethane thermal insulation layer is sprayed or brushed with a second fluorosilicone anti-corrosion coating layer.

4. A reinforced anti-corrosion and anti-seepage patching structure for a direct-buried plastic-sheathed steel heating pipeline as claimed in claim 1, characterized in that: A rubber water stop strip is installed between the electric hot melt sleeve and the outer fluorosilicone resin winding belt.

5. A reinforced anti-corrosion and anti-seepage patching structure for a direct-buried plastic-sheathed steel heating pipeline as claimed in claim 1, characterized in that: The inner layer of fluorosilicone resin wrapping tape is wrapped around the outer peripheral side of the weld and extends outward by 200 mm.

6. A reinforced anti-corrosion and anti-seepage patching structure for a direct-buried plastic-sheathed steel heating pipeline as claimed in claim 1, characterized in that: The two ends of the outer fluorosilicone resin winding belt are fastened with PE plastic steel belts.

7. A reinforced anti-corrosion and anti-seepage patching structure for a direct-buried plastic-sheathed steel heating pipeline as claimed in claim 1, characterized in that: The outer fluorosilicone resin wrapping tape is coated on the outer circumference of the electric hot melt sleeve and extends outward by 200 mm.

8. A reinforced anti-corrosion and anti-seepage patching structure for a directly buried plastic-sheathed steel heating pipeline as claimed in claim 1, characterized in that: The injection hole is provided with a cover sheet or a plug.

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