CN115199828B - Corrosion-resistant metal hose for underground pipeline connection and construction method thereof - Google Patents

Corrosion-resistant metal hose for underground pipeline connection and construction method thereof Download PDF

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Publication number
CN115199828B
CN115199828B CN202210679929.6A CN202210679929A CN115199828B CN 115199828 B CN115199828 B CN 115199828B CN 202210679929 A CN202210679929 A CN 202210679929A CN 115199828 B CN115199828 B CN 115199828B
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metal hose
layer
protective sleeve
stainless steel
electroplating
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CN115199828A (en
Inventor
吴昆�
王康康
丁丁
辛茂杰
孙兴盛
刘发亮
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Qingdao Yilian Construction Group Co ltd
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Qingdao Yilian Construction Group Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
    • F16L11/15—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics corrugated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F15/00—Other methods of preventing corrosion or incrustation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
    • F16L1/036—Laying or reclaiming pipes on land, e.g. above the ground in the ground the pipes being composed of sections of short length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/06—Accessories therefor, e.g. anchors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/026—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with interior reinforcement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/12—Coatings characterised by the materials used by tar or bitumen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention discloses a corrosion-resistant metal hose for connecting an underground pipeline and a construction method thereof. According to the invention, the metal hose is prepared by the corrugated pipe, the braiding layer and the protective sleeve, and is applied to the municipal engineering underground pipeline connector, so that the excavation is avoided, the exposed excavation construction is changed into the blind connection construction, the concrete maintenance is not needed, the construction period is greatly shortened, and the construction cost and the safety risk can be effectively reduced. The flexible metal hose has good flexibility, can better meet the deformation caused by uneven settlement between different foundations and new and old pipelines, allows larger construction deviation, can adapt to the condition of larger difference between the axis of the pipeline and the height difference, is simple and easy to construct, has outstanding advantages, and has remarkable economic and social benefits.

Description

Corrosion-resistant metal hose for underground pipeline connection and construction method thereof
Technical Field
The invention relates to the technical field of corrosion prevention of metal hoses, in particular to a corrosion-resistant metal hose for underground pipeline connection and a construction method thereof.
Background
In the pipe jacking construction of municipal engineering, the traditional method for connecting the new pipeline and the old pipeline is a reinforced concrete settlement joint construction method. The traditional construction method has the advantages of clear excavation construction, long construction period, large excavation depth and easy influence on normal construction due to restriction of construction environment. If the periphery of the excavation range is adjacent to a pipeline, a building and the like, a reliable supporting scheme is needed, the construction measure cost is high, the safety coefficient is low, foundation pit collapse is easy to occur, the building is inclined and cracked, and accidents such as pipeline slippage and damage are caused. Therefore, we propose a corrosion-resistant metal hose for underground pipeline connection and a construction method thereof.
Disclosure of Invention
The invention aims to provide a corrosion-resistant metal hose for connecting an underground pipeline and a construction method thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides an underground piping connection is with corrosion-resistant metal collapsible tube, includes bellows, suit at the weaving layer of bellows lateral wall, suit at the protective sheath of weaving layer lateral wall, the both ends of weaving layer are provided with presses the net ring, press the net ring to deviate from the one end of bellows and install the joint.
Further, the surface of the corrugated pipe and the braiding layer is provided with a metal layer, and the metal layer is plated with tin-nickel alloy and Ni (OH) by electrolessly plating 2 And replacing iron and phosphating to obtain the product.
Further, the preparation process of the metal layer comprises the following steps:
(1) Electroplating tin-nickel alloy: taking the corrugated pipe and the woven layer as cathodes and the nickel plate as anodes, and placing the corrugated pipe and the woven layer into electroplating solution containing stannous chloride and stannic sulfate for electroplating for 10-20 min to form a tin-nickel alloy layer;
(2) Electroless Ni plating (OH) 2 : immersing a tin-nickel alloy layer in a glucose and sodium hydroxide mixed solution, slowly adding an equal volume of nickel nitrate solution, and reacting for 10-30 min to form Ni (OH) 2 A nano layer;
(3) Replacement iron: ni (OH) 2 The nano layer is placed in 8-12 mol/L of ferric nitrate aqueous solution and immersed for 50-70 min to form an iron-nickel layer;
(4) Phosphating: and (3) taking red phosphorus powder as a phosphorus source, and phosphating for 60-90 min at 420-480 ℃ in an argon atmosphere to obtain the metal layer.
Further, the electroplating solution contains 35g/L stannous chloride, 45g/L tin sulfate, 250-300 g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 1-2 g/L glycine.
Further, the electroplating process comprises the following steps: the current density is 10-20 mA/cm 2 Electroplating at 45 ℃ for 10-20 min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the woven layer in the electroplating solution is 5cm.
Further, the concentration of glucose in the mixed solution is 150-200 g/L, and the concentration of sodium hydroxide is 10g/L; the concentration of the nickel nitrate solution is 0.01mol/L.
In the technical scheme, firstly, electroplating is carried out on the surface of the corrugated pipe or the braiding layer, a tin-nickel alloy layer is formed by deposition, and the tin-nickel alloy layer contains a tin-nickel alloy phase and metallic nickel, so that the corrosion current of the corrugated pipe or the braiding layer can be reduced, the corrosion resistance of the corrugated pipe or the braiding layer is improved, the binding force between the prepared metallic layer and a corrugated pipe or braiding layer substrate is ensured, the brittleness is low, the toughness is good, and the bending performance of the prepared metallic hose is facilitated; and then taking the tin-nickel alloy layer as a core to promote the nucleation and crystallization of Ni (OH) 2 in the chemical plating, partially replacing the formed Ni (OH) 2 nano layer with iron ions to obtain an iron-nickel layer, and phosphating in a high-temperature argon atmosphere to obtain a metal layer containing iron phosphide and nickel phosphide, so that the contact between a corrugated pipe or a woven layer substrate and a corrosive medium can be further blocked, the corrosion current is reduced, and the corrosion resistance of the corrugated pipe or the woven layer is improved.
Further, the corrugated pipe and the braiding layer are one of SUS304, SUS316 and SUS316L; good flexibility, corrosion resistance, high and low temperature resistance, shock absorption and noise reduction, strong sealing performance and long service life,
further, the braiding layers are braided by stainless steel wires or stainless steel belts; a flat plaited net and a plaited net can be adopted;
further, the inner diameter of the corrugated pipe is 8-400 mm, and the outer diameter of the corrugated pipe is 13.2-460 mm;
further, the outer diameter of the corrugated pipe after the woven layer is arranged is 14.4-464.8 mm.
A mesh pressing ring is also arranged for connecting the corrugated pipe, the braiding layer and the joint. During welding, the corrugated pipe and the woven layer are welded with the mesh pressing ring.
The protective sleeve is arranged on the outer side wall of the metal hose, so that the woven layer can be protected under the environment with very high abrasion degree, and fluid flowing out of the hose body can be dispersed under the condition that the metal hose is damaged, so that the safety protection effect is achieved. The protective sheath cannot use elemental chlorine-containing materials such as PVC and the like.
In applications where extreme bending of the hose connection often occurs, the connection should be reinforced; the connection may be reinforced with an inter-lock sleeve or spring to protect the bend.
Further, the protective sleeve is one of an inter sleeve, a heat-shrinkable tube and an elastomer sleeve.
Further, the protective sleeve comprises the following components in parts by weight: 80 to 90 parts of thermoplastic polyurethane elastomer 60A, 8 to 12 parts of stainless steel powder, 5 to 6 parts of carbon black, 0.2 to 0.4 part of antioxidant, 3.2 to 3.6 parts of fluorine-containing polyacrylate and 8 to 10 parts of 4,4' -diphenylmethane diisocyanate.
Further, the protective sleeve is prepared by the following process:
(1) Modification of stainless steel powder: 1.1. taking toluene, adding stainless steel powder and 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, performing ultrasonic dispersion for 8-12 min, and performing reflux reaction for 4.5-6.0 h; centrifuging at 1200-1300 rpm, taking the precipitate, washing with absolute ethyl alcohol, and drying to obtain coupled stainless steel powder;
3.5 to 5.0 percent of the mass of the stainless steel powder is 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane;
1.2. taking 2, 4-diphenylmethane diisocyanate and aniline trimer, heating to 70-90 ℃, stirring and reacting for 2-4 hours, and cooling to 30-40 ℃;
under the protection of nitrogen atmosphere, adding coupling stainless steel powder, 1- (2-amino ethyl) -4-piperidyl methanol and dibutyl tin dilauryl silicate, heating to 40-70 ℃, and stirring for reacting for 3-5 hours to obtain modified stainless steel powder;
the molar ratio of the 2, 4-diphenylmethane diisocyanate to the aniline trimer to the 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane to the 1- (2-aminoethyl) -4-piperidinemethanol to the dibutyltin dilaurate is (2.2-3.0) 1 (1.2-1.5) 0.7-1.2) 0.03-0.05.
(2) Preparation of the protective sleeve:
mixing thermoplastic polyurethane elastomer 70A, fluorine-containing polyacrylate, 4' -diphenylmethane diisocyanate, stainless steel powder, carbon black and an antioxidant, and extruding by the following steps: the temperature of the screw is 160-180 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 100-250 r/min, so that the protective sleeve is obtained.
Further, the stainless steel powder is one of SUS304, SUS316 and SUS316L, and the average grain diameter is 14-38 μm. The selected stainless steel powder has higher toughness and plasticity; the product has better intergranular corrosion resistance and excellent corrosion resistance and heat resistance.
Furthermore, the fluorine-containing polyacrylate is mercaptoethanol-terminated poly-2, 2-trifluoroethyl acrylate, and the molecular weight is 15000-25000.
Further, the antioxidant is the compounding of the antioxidant 1010 and the antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
In the technical scheme, the packing stainless steel powder is added into the protective sleeve, and the packing stainless steel powder is stacked in the organic components in the protective sleeve to form a multilayer compact structure, so that the mechanical property, the peeling resistance and the corrosion resistance of the prepared protective sleeve are improved; the surface of the stainless steel powder is modified, siloxane, aniline trimer and piperidine are polymerized by utilizing isocyanic acid groups, and adsorbed and wrapped on the surface of the stainless steel powder to form a core-shell structure, so that the apparent activation energy of the stainless steel powder is improved, the corrosion reaction barrier is increased, and the corrosion reaction is inhibited; meanwhile, the interface performance between the stainless steel powder and the organic matrix can be improved, and the toughness, corrosion resistance and stability of the prepared protective sleeve are improved. The polyurethane elastomer is added into a polyurethane elastomer matrix together with fluorine-containing polyacrylate and diisocyanate, and cross-linking is performed to form a cross network, so that the molecular compactness is improved, microscopic pore channels in the system are reduced, the permeation resistance is improved, and the impedance drop is delayed; the fluorine-containing chain segment migrates to the surface to form a micro-nano structure, so that the surface energy is reduced, and the bending resistance and the corrosion resistance of the prepared protective sleeve can be further improved.
The construction method of the corrosion-resistant metal hose for connecting the underground pipeline comprises the following steps:
(1) Retesting the axis and the elevation of the pipeline;
(2) Setting a protective sleeve;
(3) The interface is used for adjusting the soil sampling;
(4) Installing a protective sleeve;
(5) Determining the pipe diameter and the length of a metal hose;
(6) Processing a metal hose;
(7) And (5) installing and constructing the metal hose.
Further, the method comprises the following steps:
(1) Retesting the axis and the elevation of the pipeline; retest the elevation and axis of the pipe orifice of the pipe-jacking and the joint of the pipe to be connected;
(2) Setting a protective sleeve: confirming the length of the protective sleeve;
(3) Adjusting the soil sampling at the joint: taking soil in the opposite direction of the pipe jacking deviation, and eliminating the elevation deviation and the axis deviation of the two sections of pipes to be connected;
(4) And (3) installing a protection sleeve: after the soil sampling is adjusted at the joint, a protective sleeve is installed;
(5) Determining the pipe diameter and the length of a metal hose; determining the length of a needed metal hose according to the length of the protective sleeve and the included angle of the axes of the two sections of pipelines to be connected;
(6) Processing a metal hose: connecting sections in a horn mouth shape are arranged at two ends of the metal hose;
(7) And (3) installing and constructing a metal hose: and welding the connecting sections at the two ends of the metal hose on the inner wall of the pipeline to be connected.
Further, the method comprises the following steps:
(1) Pipeline axis and elevation retest
Stopping jacking when the jacking is about to finish 2-3 m of the rest of the jacking pipe, and retesting the elevation and the axis of the pipe orifice of the jacking pipe and the joint of the to-be-connected pipeline;
(2) Setting protection sleeve
The protective sleeve is mainly used for protecting the metal hose from being corroded by pressure (mainly soil pressure) and groundwater. For convenient construction, the pipe is usually a steel pipe with a wall thickness of 1cm. The length of the metal hose can be primarily determined according to the axis and the elevation deviation of the two sections of pipelines to be connected, so that the length of the protection sleeve can be determined, the protection sleeve is preferably shorter than the metal hose by 10-15 cm, and the length of the protection sleeve can be arbitrarily determined according to actual needs because the protection sleeve is a steel pipe. The pipe diameter of the protective sleeve is equal to or slightly smaller than that of the jacking pipe;
(3) Soil sampling device with adjustable joint
And (3) adjusting soil taking according to the elevation and axis deviation of the two sections of pipelines to be connected, and taking soil in the opposite direction of the pipe jacking deviation during soil taking so as to eliminate the elevation deviation and axis deviation of the two sections of pipelines to be connected. Reverse soil sampling can be interpreted as: when the jacking pipe deviates downwards, the soil should be taken upwards; when the jacking pipe deviates leftwards, soil should be fetched rightwards; and vice versa. The soil taking amount is suitable for just eliminating the elevation deviation and the axis deviation of the jacking pipe;
(4) Protective sleeve installation
After the soil sampling is adjusted at the joint, the protection sleeve can be installed. When the jacking pipe is a steel pipe, the protection sleeve directly utilizes the jacking pipe, and the sleeve with the required length is directly jacked in; when the jacking pipe is a reinforced concrete pipe, the protection sleeve can be transported from the inside of the jacking pipe to the joint for installation (the pipe diameter of the protection sleeve is slightly smaller than the pipe diameter of the jacking pipe at the moment). The distance between the sleeve and the pipeline to be connected is preferably 10-15 cm during jacking (installation). After the protection sleeve is jacked, the protection sleeve is disconnected from the original pipeline at the starting position of the sleeve (can be cut by gas welding). In order to meet the requirements of deformation and uneven settlement to the greatest extent, the sleeve pipe itself should be broken, each section is preferably about 1m, but at least not less than 2 sections, and the gap between the sleeve pipes is preferably 2-3 cm. The gap between the sleeves is sealed by adhering rubber water stop strips on the inner wall of the pipeline to prevent the invasion of underground water. The bonding width of the rubber water stop on each side of the sleeve is not smaller than 20cm, and the rubber water stop is bonded by glue and then is compacted point by using an iron hammer so as to be firmly bonded. After the strength of the adhesive reaches 100%, the next working procedure is allowed to be performed, and during the period, the sleeve is not allowed to bear any external force;
(5) Determining the pipe diameter and length of a metal hose
The length of the metal hose can be determined according to the length of the protective sleeve and the included angle between the axes of the two sections of pipelines to be connected, and the length of the metal hose is preferably longer than the protective sleeve by more than 20 cm. The pipe diameter of the metal hose is smaller than the inner diameter of the protective sleeve, so that the construction is convenient, and the minimum section flow loss is ensured, and the pipe diameter of the metal hose is smaller than the pipe diameter of the sleeve by about 20 cm;
(6) Processing of metal hose
The wave height, wave distance and wall thickness of the metal hose should be comprehensively determined according to the maximum deformation born, the working pressure of the pipeline, the pipe diameter, the connection length and the like. In general, the diameter of the metal hose is about 20cm smaller than that of the protective sleeve, and the difference can be treated by using a steel bell mouth, namely, an A3 steel is used for manufacturing a bell mouth-shaped connecting section with the length of 30-40 cm, and the diameter is gradually changed from the diameter of the soft connection to the diameter of the protective sleeve. The outer wall of the metal hose should be treated with special reinforcement level of epoxy asphalt for corrosion protection (three-cloth-four-oil method);
(7) Installation construction of metal hose
After the metal hose is in place, the two ends of the metal hose are welded with the inner walls of the two sections of pipelines to be connected respectively at the bell mouths of the two ends, and the metal hose is welded with the steel bellmouth when being used for reinforcing the concrete pipe.
In the technical scheme, the metal hose is often used as a flexible compensation piece in the liquid conveying system in industrial application and is used for compensating the mutual displacement of the connecting ends of a pipeline, a machine and equipment, absorbing vibration energy, playing roles of damping, silencing and the like, and the metal hose has the advantages of being good in flexibility, light in weight, corrosion-resistant, fatigue-resistant, high-low-temperature-resistant and the like.
By referring to the successful experience of the metal hose in industrial application, the metal hose is applied to the underground pipeline joint of municipal engineering, so that excavation can be avoided, and the excavation construction is changed into the blind connection construction. Concrete maintenance is not needed, so that the construction period is greatly shortened; and excavation and supporting are not needed, and the construction cost and the safety risk are greatly reduced. The flexible metal hose is very good, can be better satisfy the deformation that the inhomogeneous subsidence produced between different foundations and new and old pipeline, and the metal hose allows bigger construction deviation, under the condition that pipeline axis and difference in height are great, can all succeed in connecting. The metal hose has the advantages of simple and easy construction, outstanding advantages, and obvious economic and social benefits.
The construction of the metal hose is to weld the inner wall of the pipeline by using the metal hose, so that two sections of pipelines are connected into a whole.
When the pipe diameter D is less than or equal to 1500, the construction is most convenient and feasible, and the pipe diameter D is economical and reasonable; can be used for:
1. connecting steel pipes with the same pipe diameter;
2. connecting steel pipes with different pipe diameters;
3. steel bellmouth reinforced concrete pipes with the same pipe diameter are connected;
4. steel bellmouth reinforced concrete pipes among different pipe diameters are connected;
5. the steel pipes with the same pipe diameter are connected with the reinforced concrete pipes with the steel bellmouth;
6. the steel pipes with different pipe diameters are connected with the reinforced concrete pipe with the steel bellmouth.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the corrosion-resistant metal hose for connecting the underground pipeline and the construction method thereof, the metal hose is prepared by the corrugated pipe, the braiding layer sleeved on the outer side wall of the corrugated pipe and the protective sleeve sleeved on the outer side wall of the braiding layer, so that successful experience of the metal hose in industrial application is used as a reference, the metal hose is applied to an underground pipeline interface of municipal engineering, excavation is avoided, the excavation construction is changed into the blind connection construction, concrete maintenance is not needed, the construction period is greatly shortened, and the construction cost and the safety risk can be effectively reduced. The flexible metal hose has good flexibility, can better meet the deformation caused by uneven settlement between different foundations and new and old pipelines, allows larger construction deviation, can adapt to the condition of larger difference between the axis of the pipeline and the height difference, is simple and easy to construct, has outstanding advantages, and has remarkable economic and social benefits.
2. The invention relates to a corrosion-resistant metal hose for connecting underground pipelines and a construction method thereof, wherein the surfaces of a corrugated pipe and a braiding layer are sequentially electroplated with tin-nickel alloy and chemically plated with Ni (OH) 2 The metal layer is arranged in the iron replacement and phosphating process, so that the corrosion resistance of the corrugated pipe or the braiding layer can be improved, meanwhile, the metal layer and the corrugated pipe or the braiding layer are combined, the brittleness is low, the toughness is good, and the bending performance of the manufactured metal hose is facilitated.
3. According to the corrosion-resistant metal hose for underground pipeline connection and the construction method thereof, the mechanical property, the peeling resistance and the corrosion resistance of the prepared protective sleeve are improved by adding the filler stainless steel powder into the protective sleeve, the protective sleeve is subjected to surface modification, siloxane, aniline trimer and piperidine are polymerized by using isocyanic acid groups, and are adsorbed and wrapped on the surface of the stainless steel powder to form a core-shell structure, so that the interface property between the stainless steel powder and an organic matrix is improved, and the toughness, the corrosion resistance and the stability of the prepared protective sleeve are improved; adding the polyurethane elastomer matrix, fluorinated polyacrylate and diisocyanate together, and crosslinking to improve the penetration resistance of the protective sleeve; the fluorine-containing chain segment migrates to the surface to form a micro-nano structure, so that the surface energy is reduced, and the bending resistance and the corrosion resistance of the prepared protective sleeve can be further improved.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Application example:
the environmental improvement and promotion program Gu Lugong of the ancient opening area of the yellow island region, which is established by Qingdao Yi-gang group stock company, is established by government investment, and is an important project and an image project of Qingdao city. And a water collecting well is designed at the lowest point of the tunnel to collect all rainwater in the tunnel, and the rainwater is led to a special pump station for the tunnel through a DN1000 steel rainwater pipeline, so that the problem of rainwater drainage of the tunnel is solved. The pump station water inlet pipe is DN1000 steel pipe jacking construction, the tunnel rainwater pipe is DN1000 steel pipe, the included angle between two pipe axes is 141 degrees, and the pump station water inlet pipe is designed to open excavation reinforced concrete settlement joint to connect two sections of pipelines.
The project department cancels the original design settlement joint through changing, and changes the construction into a 141-degree metal hose hidden joint method, reduces the manufacturing cost by 15.6 ten thousand yuan, shortens the construction period by 53 days, and obtains better economic benefit and social benefit.
Example 1
1. A layer of braiding layer is sleeved on the outer side wall of the corrugated pipe, a protective sleeve is sleeved on the outer side wall of the braiding layer, net pressing rings are arranged at two ends of the braiding layer, and a joint is arranged at one end, away from the corrugated pipe, of each net pressing ring, so that a metal hose is obtained; the corrugated pipe and the braiding layer are SUS304; the inner diameter of the corrugated pipe is set to be 100mm, and the outer diameter is set to be 119.6mm; the outer diameter of the corrugated pipe after the woven layer is arranged is 121.2mm; the thickness of the protective sleeve is set to be 0.56mm;
2. the surface of the corrugated pipe and the braiding layer is provided with a metal layer, and the preparation process comprises the following steps:
(1) Electroplating tin-nickel alloy: taking the corrugated pipe and the woven layer as cathodes and the nickel plate as anodes, and placing the corrugated pipe and the woven layer in electroplating solution containing stannous chloride and stannic sulfate for electroplating for 10min to form a tin-nickel alloy layer;
the electroplating solution contains 35g/L stannous chloride, 45g/L stannic sulfate, 250g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 1g/L glycine;
the electroplating process comprises the following steps: current density 10mA/cm 2 Electroplating temperature is 45 ℃, and electroplating time is 10min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the braiding layer in the electroplating solution is 5cm;
(2) Electroless Ni plating (OH) 2 : immersing a tin-nickel alloy layer in a glucose and sodium hydroxide mixed solution, slowly adding an equal volume of nickel nitrate solution, and reacting for 10min to form Ni (OH) 2 A nano layer;
the concentration of glucose in the mixed solution is 150g/L, and the concentration of sodium hydroxide is 10g/L; the concentration of the nickel nitrate solution is 0.01mol/L;
(3) Replacement iron: ni (OH) 2 The nano layer is placed in 8mol/L of ferric nitrate aqueous solution and immersed for 50min, so that an iron-nickel layer is formed;
(4) Phosphating: taking red phosphorus powder as a phosphorus source, and carrying out phosphating for 60min at 420 ℃ in an argon atmosphere to obtain a metal layer;
3. the preparation process of the protective sleeve comprises the following steps:
(1) Modification of stainless steel powder:
1.1. taking toluene, adding stainless steel powder and 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, performing ultrasonic dispersion for 8min, and performing reflux reaction for 4.5h; centrifuging at 1200rpm, collecting precipitate, washing with absolute ethanol, and drying to obtain coupled stainless steel powder;
3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane is 3.5% of the mass of the stainless steel powder;
1.2. taking 2, 4-diphenylmethane diisocyanate and aniline trimer, heating to 70 ℃, stirring for reacting for 2 hours, and cooling to 30 ℃;
under the protection of nitrogen atmosphere, adding coupling stainless steel powder, 1- (2-amino ethyl) -4-piperidinemethanol and dibutyl tin dilauryl silicate, heating to 40 ℃, and stirring for reaction for 3 hours to obtain modified stainless steel powder;
the molar ratio of 2, 4-diphenylmethane diisocyanate, aniline trimer, 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, 1- (2-aminoethyl) -4-piperidinemethanol and dibutyltin dilaurate is 2.2:1:1.2:0.7:0.03.
(2) Preparation of the protective sleeve:
80 parts of thermoplastic polyurethane elastomer 60A, 8 parts of stainless steel powder, 5 parts of carbon black, 0.2 part of antioxidant, 3.2 parts of fluorine-containing polyacrylate and 8 parts of 4,4' -diphenylmethane diisocyanate are mixed, extruded and the extrusion process is as follows: the temperature of the screw is 160 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 100r/min, so that the protective sleeve is obtained.
The stainless steel powder is SUS304, and the average grain diameter is 14 mu m; the fluorine-containing polyacrylate is mercaptoethanol-terminated poly (2, 2-trifluoroethyl) acrylate, and the molecular weight is 15000; the antioxidant is the compound of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
Example 2
1. A layer of braiding layer is sleeved on the outer side wall of the corrugated pipe, a protective sleeve is sleeved on the outer side wall of the braiding layer, net pressing rings are arranged at two ends of the braiding layer, and a joint is arranged at one end, away from the corrugated pipe, of each net pressing ring, so that a metal hose is obtained; the corrugated pipe and the braiding layer are SUS316; the inner diameter of the corrugated pipe is set to be 100mm, and the outer diameter is set to be 119.6mm; the outer diameter of the corrugated pipe after the woven layer is arranged is 121.2mm; the thickness of the protective sleeve is set to be 0.56mm;
2. the surface of the corrugated pipe and the braiding layer is provided with a metal layer, and the preparation process comprises the following steps:
(1) Electroplating tin-nickel alloy: taking the corrugated pipe and the woven layer as cathodes and the nickel plate as anodes, and placing the corrugated pipe and the woven layer in electroplating solution containing stannous chloride and stannic sulfate for electroplating for 15min to form a tin-nickel alloy layer;
the electroplating solution contains 35g/L stannous chloride, 45g/L tin sulfate, 275g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 1.5g/L glycine;
the electroplating process comprises the following steps: current density 15mA/cm 2 Electroplating temperature is 45 ℃, and electroplating time is 15min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the braiding layer in the electroplating solution is 5cm;
(2) Electroless Ni plating (OH) 2 : immersing tin in glucose and sodium hydroxide mixed solutionThe nickel alloy layer is slowly added with an equal volume of nickel nitrate solution to react for 20min to form Ni (OH) 2 A nano layer;
the concentration of glucose in the mixed solution is 175g/L, and the concentration of sodium hydroxide is 10g/L; the concentration of the nickel nitrate solution is 0.01mol/L;
(3) Replacement iron: ni (OH) 2 The nano layer is placed in 10mol/L of ferric nitrate aqueous solution and immersed for 60min to form an iron-nickel layer;
(4) Phosphating: taking red phosphorus powder as a phosphorus source, and carrying out phosphating for 75min at 450 ℃ in an argon atmosphere to obtain a metal layer;
3. the preparation process of the protective sleeve comprises the following steps:
(1) Modification of stainless steel powder: 1.1. taking toluene, adding stainless steel powder and 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, performing ultrasonic dispersion for 10min, and performing reflux reaction for 5.2h; centrifuging at 1250rpm, taking the precipitate, washing with absolute ethyl alcohol, and drying to obtain coupled stainless steel powder;
3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane is 4.2% of the mass of the stainless steel powder;
1.2. taking 2, 4-diphenylmethane diisocyanate and aniline trimer, heating to 80 ℃, stirring for reaction for 3 hours, and cooling to 35 ℃;
under the protection of nitrogen atmosphere, adding coupling stainless steel powder, 1- (2-amino ethyl) -4-piperidinemethanol and dibutyl tin dilaurate, heating to 55 ℃, and stirring for reacting for 4 hours to obtain modified stainless steel powder;
the molar ratio of 2, 4-diphenylmethane diisocyanate, aniline trimer, 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, 1- (2-aminoethyl) -4-piperidinemethanol and dibutyltin dilaurate is 2.6:1:1.3:1.0:0.04.
(2) Preparation of the protective sleeve:
85 parts of thermoplastic polyurethane elastomer 60A, 10 parts of stainless steel powder, 5.5 parts of carbon black, 0.3 part of antioxidant, 3.4 parts of fluorine-containing polyacrylate and 9 parts of 4,4' -diphenylmethane diisocyanate are mixed, extruded, and the extrusion process is as follows: the temperature of the screw is 170 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 180r/min, so that the protective sleeve is obtained.
The stainless steel powder is SUS316, and the average grain diameter is 26 mu m; the fluorine-containing polyacrylate is mercaptoethanol-terminated poly (2, 2-trifluoroethyl) acrylate, and the molecular weight is 20000; the antioxidant is the compound of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
Example 3
1. A layer of braiding layer is sleeved on the outer side wall of the corrugated pipe, a protective sleeve is sleeved on the outer side wall of the braiding layer, net pressing rings are arranged at two ends of the braiding layer, and a joint is arranged at one end, away from the corrugated pipe, of each net pressing ring, so that a metal hose is obtained; the corrugated pipe and the braiding layer are SUS316L; the inner diameter of the corrugated pipe is set to be 100mm, and the outer diameter is set to be 119.6mm; the outer diameter of the corrugated pipe after the woven layer is arranged is 121.2mm; the thickness of the protective sleeve is set to be 0.56mm;
2. the surface of the corrugated pipe and the braiding layer is provided with a metal layer, and the preparation process comprises the following steps:
(1) Electroplating tin-nickel alloy: taking the corrugated pipe and the woven layer as cathodes and the nickel plate as anodes, and placing the corrugated pipe and the woven layer in electroplating solution containing stannous chloride and stannic sulfate for electroplating for 20min to form a tin-nickel alloy layer;
the electroplating solution contains 35g/L stannous chloride, 45g/L stannic sulfate, 300g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 2g/L glycine;
the electroplating process comprises the following steps: current density 20mA/cm 2 Electroplating temperature is 45 ℃, and electroplating time is 20min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the braiding layer in the electroplating solution is 5cm;
(2) Electroless Ni plating (OH) 2 : immersing a tin-nickel alloy layer in a glucose and sodium hydroxide mixed solution, slowly adding an equal volume of nickel nitrate solution, and reacting for 30min to form Ni (OH) 2 A nano layer;
the concentration of glucose in the mixed solution is 200g/L, and the concentration of sodium hydroxide is 10g/L; the concentration of the nickel nitrate solution is 0.01mol/L;
(3) Replacement iron: ni (OH) 2 The nano layer is placed in 12mol/L ferric nitrate aqueous solution and immersed for 70min to form an iron-nickel layer;
(4) Phosphating: taking red phosphorus powder as a phosphorus source, and phosphating for 90min at 480 ℃ in an argon atmosphere to obtain a metal layer;
3. the preparation process of the protective sleeve comprises the following steps:
(1) Modification of stainless steel powder: 1.1. taking toluene, adding stainless steel powder and 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, performing ultrasonic dispersion for 12min, and performing reflux reaction for 6.0h; centrifuging at 1300rpm, collecting precipitate, washing with absolute ethanol, and drying to obtain coupled stainless steel powder;
3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane is 5.0% of the mass of the stainless steel powder;
1.2. taking 2, 4-diphenylmethane diisocyanate and aniline trimer, heating to 90 ℃, stirring for reacting for 4 hours, and cooling to 40 ℃;
under the protection of nitrogen atmosphere, adding coupling stainless steel powder, 1- (2-amino ethyl) -4-piperidinemethanol and dibutyl tin dilauryl silicate, heating to 70 ℃, and stirring for reacting for 5 hours to obtain modified stainless steel powder;
the molar ratio of 2, 4-diphenylmethane diisocyanate, aniline trimer, 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, 1- (2-aminoethyl) -4-piperidinemethanol and dibutyltin dilaurate is 3.0:1:1.5:1.2:0.05.
(2) Preparation of the protective sleeve:
90 parts of thermoplastic polyurethane elastomer 60A, 12 parts of stainless steel powder, 6 parts of carbon black, 0.4 part of antioxidant, 3.6 parts of fluorine-containing polyacrylate and 10 parts of 4,4' -diphenylmethane diisocyanate are mixed, extruded and the extrusion process is as follows: the temperature of the screw is 180 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 250r/min, so that the protective sleeve is obtained.
The stainless steel powder is SUS316L, and the average grain diameter is 38 mu m; the fluorine-containing polyacrylate is mercaptoethanol-terminated poly (2, 2-trifluoroethyl) acrylate with a molecular weight of 25000; the antioxidant is the compound of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
Comparative example 1
The preparation process of the metal layer comprises the following steps:
(1) Electroplating tin-nickel alloy: taking SUS304 as a cathode and a nickel plate as an anode, and placing the nickel plate into an electroplating solution containing stannous chloride and stannic sulfate for electroplating for 10min to form a tin-nickel alloy layer;
the electroplating solution contains 35g/L stannous chloride, 45g/L stannic sulfate, 250g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 1g/L glycine;
the electroplating process comprises the following steps: current density 10mA/cm 2 Electroplating temperature is 45 ℃, and electroplating time is 10min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the braiding layer in the electroplating solution is 5cm;
phosphating: and (3) taking red phosphorus powder as a phosphorus source, and carrying out phosphating for 60min at 420 ℃ in an argon atmosphere to obtain the metal layer.
The first and third processes were the same as in example 1 to obtain metal hoses.
Comparative example 2
The preparation process of the metal layer comprises the following steps:
(1) Electroplating tin-nickel alloy: taking SUS304 as a cathode and a nickel plate as an anode, and placing the nickel plate into an electroplating solution containing stannous chloride and stannic sulfate for electroplating for 10min to form a tin-nickel alloy layer;
the electroplating solution contains 35g/L stannous chloride, 45g/L stannic sulfate, 250g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 1g/L glycine;
the electroplating process comprises the following steps: current density 10mA/cm 2 Electroplating temperature is 45 ℃, and electroplating time is 10min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the braiding layer in the electroplating solution is 5cm;
(2) Electroless Ni plating (OH) 2 : immersing a tin-nickel alloy layer in a glucose and sodium hydroxide mixed solution, slowly adding an equal volume of nickel nitrate solution, and reacting for 10min to form Ni (OH) 2 A nano layer;
the concentration of glucose in the mixed solution is 150g/L, and the concentration of sodium hydroxide is 10g/L; the concentration of the nickel nitrate solution is 0.01mol/L;
(3) Phosphating: and (3) taking red phosphorus powder as a phosphorus source, and carrying out phosphating for 60min at 420 ℃ in an argon atmosphere to obtain the metal layer.
The first and third processes were the same as in example 1 to obtain metal hoses.
Comparative example 3
The preparation process of the metal layer comprises the following steps:
(1) Electroplating tin-nickel alloy: taking SUS304 as a cathode and a nickel plate as an anode, and placing the nickel plate into an electroplating solution containing stannous chloride and stannic sulfate for electroplating for 10min to form a tin-nickel alloy layer;
the electroplating solution contains 35g/L stannous chloride, 45g/L stannic sulfate, 250g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 1g/L glycine;
the electroplating process comprises the following steps: current density 10mA/cm 2 Electroplating temperature is 45 ℃, and electroplating time is 10min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the braiding layer in the electroplating solution is 5cm;
(2) Electroless Ni plating (OH) 2 : immersing a tin-nickel alloy layer in a glucose and sodium hydroxide mixed solution, slowly adding an equal volume of nickel nitrate solution, and reacting for 10min to form Ni (OH) 2 A nano layer; heat treatment is carried out for 60min at 420 ℃ in argon atmosphere to obtain a metal layer;
the concentration of glucose in the mixed solution is 150g/L, and the concentration of sodium hydroxide is 10g/L; the concentration of the nickel nitrate solution was 0.01mol/L.
The first and third processes were the same as in example 1 to obtain metal hoses.
Comparative example 4
No metal layer is arranged on the surface of SUS304;
the first and third processes were the same as in example 1 to obtain metal hoses.
Comparative example 5
The preparation process of the protective sleeve comprises the following steps:
(1) Modification of stainless steel powder:
1.1. taking toluene, adding stainless steel powder and 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, performing ultrasonic dispersion for 8min, and performing reflux reaction for 4.5h; centrifuging at 1200rpm, collecting precipitate, washing with absolute ethanol, and drying to obtain coupled stainless steel powder;
3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane is 3.5% of the mass of the stainless steel powder;
(2) Preparation of the protective sleeve:
80 parts of thermoplastic polyurethane elastomer 60A, 8 parts of stainless steel powder, 5 parts of carbon black, 0.2 part of antioxidant, 3.2 parts of fluorine-containing polyacrylate and 8 parts of 4,4' -diphenylmethane diisocyanate are mixed, extruded and the extrusion process is as follows: the temperature of the screw is 160 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 100r/min, so that the protective sleeve is obtained.
The stainless steel powder is SUS304, and the average grain diameter is 14 mu m; the fluorine-containing polyacrylate is mercaptoethanol-terminated poly (2, 2-trifluoroethyl) acrylate, and the molecular weight is 15000; the antioxidant is the compound of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
The first and second processes were the same as in comparative example 4, to obtain a metal hose.
Comparative example 6
The preparation process of the protective sleeve comprises the following steps:
(1) Modification of stainless steel powder:
1.1. taking 2, 4-diphenylmethane diisocyanate and aniline trimer, heating to 70 ℃, stirring for reacting for 2 hours, and cooling to 30 ℃;
under the protection of nitrogen atmosphere, adding stainless steel powder, 1- (2-amino ethyl) -4-piperidinemethanol and dibutyl tin dilaurate, heating to 40 ℃, and stirring for reaction for 3 hours to obtain modified stainless steel powder;
the molar ratio of the 2, 4-diphenylmethane diisocyanate to the aniline trimer to the 1- (2-aminoethyl) -4-piperidinemethanol to the dibutyltin dilaurate is 2.2:1.2:0.7:0.03.
(2) Preparation of the protective sleeve:
80 parts of thermoplastic polyurethane elastomer 60A, 8 parts of stainless steel powder, 5 parts of carbon black, 0.2 part of antioxidant, 3.2 parts of fluorine-containing polyacrylate and 8 parts of 4,4' -diphenylmethane diisocyanate are mixed, extruded and the extrusion process is as follows: the temperature of the screw is 160 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 100r/min, so that the protective sleeve is obtained.
The stainless steel powder is SUS304, and the average grain diameter is 14 mu m; the fluorine-containing polyacrylate is mercaptoethanol-terminated poly (2, 2-trifluoroethyl) acrylate, and the molecular weight is 15000; the antioxidant is the compound of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
The first and second processes were the same as in comparative example 4, to obtain a metal hose.
Comparative example 7
The preparation process of the protective sleeve comprises the following steps:
80 parts of thermoplastic polyurethane elastomer 60A, 8 parts of stainless steel powder, 5 parts of carbon black, 0.2 part of antioxidant, 3.2 parts of fluorine-containing polyacrylate and 8 parts of 4,4' -diphenylmethane diisocyanate are mixed, extruded and the extrusion process is as follows: the temperature of the screw is 160 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 100r/min, so that the protective sleeve is obtained.
The stainless steel powder is SUS304, and the average grain diameter is 14 mu m; the fluorine-containing polyacrylate is mercaptoethanol-terminated poly (2, 2-trifluoroethyl) acrylate, and the molecular weight is 15000; the antioxidant is the compound of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
The first and second processes were the same as in comparative example 4, to obtain a metal hose.
Comparative example 8
The preparation process of the protective sleeve comprises the following steps:
80 parts of thermoplastic polyurethane elastomer 60A, 15 parts of carbon black, 0.2 part of antioxidant, 3.2 parts of fluorine-containing polyacrylate and 8 parts of 4,4' -diphenylmethane diisocyanate are mixed, extruded, and the extrusion process is as follows: the temperature of the screw is 160 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 100r/min, so that the protective sleeve is obtained.
The fluorine-containing polyacrylate is mercaptoethanol-terminated poly (2, 2-trifluoroethyl) acrylate, and the molecular weight is 15000; the antioxidant is the compound of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
The first and second processes were the same as in comparative example 4, to obtain a metal hose.
Experiment
The metal hoses obtained in examples 1 to 3 and comparative examples 1 to 8 were sampled, and the properties thereof were measured and the measurement results were recorded, respectively:
salt spray test of metal layer: taking a steel strip and a surface metal layer thereof as samples, wherein the thickness of the samples is 2.5 mu m, and the sizes of the samples are 50cm multiplied by 50cm; to be used forGB 6458-2002 is a test standard, and a salt spray corrosion test box and an air compressor are used for testing a sample; the test parameters are as follows: salt fog is 50g/L sodium chloride solution, pH is 7.0, test temperature is 35 ℃, and salt fog sedimentation rate is 1.5ml/80cm 2 ·h。
Salt spray test of protective sleeve: taking a steel belt and a protective sleeve coated on the surface of the steel belt as a sample, and carrying out a salt spray test by taking GB/T12000-2017 as a test standard;
after 16h of salt spray test, the steel strip is rated by taking GB 6461-2002 as a rating standard.
From the data in the above table, the following conclusions can be clearly drawn:
the metal hoses obtained in examples 1 to 3 were compared with those obtained in comparative examples 1 to 8, and it was found that,
compared with comparative example 8, the metal hose obtained in examples 1-3 has more excellent appearance of the metal layer and the steel strip of the protective sleeve after salt spray test, and the metal layer and the protective sleeve are better in corrosion resistance, so that the manufactured metal hose has higher highest working pressure, and the static minimum bending radius of the metal hose is not obviously deteriorated, which fully demonstrates that the corrosion resistance of the manufactured metal hose is improved;
the metal hoses obtained in comparative examples 1 to 4 were changed in the preparation process of the metal layer as compared with example 1; the metal hoses obtained in comparative examples 5 to 8 were changed in the preparation process of the protective sheath as compared with comparative example 4; the steel strip after the salt spray test is corroded more, the corrosion resistance is deteriorated, and the static minimum bending radius and the highest working pressure of the manufactured metal hose are different; the metal layer, the protective sleeve component and the preparation process thereof can ensure the bending performance and the compression resistance and improve the corrosion resistance of the manufactured metal hose.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process method article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process method article or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A corrosion-resistant metal hose for underground pipeline connection is characterized in that: the corrugated pipe comprises a corrugated pipe, a braiding layer sleeved on the outer side wall of the corrugated pipe and a protective sleeve sleeved on the outer side wall of the braiding layer, wherein two ends of the braiding layer are provided with net pressing rings, and one end of each net pressing ring, which is away from the corrugated pipe, is provided with a joint;
the surface of the corrugated pipe and the braiding layer is provided with a metal layer, and the metal layer is plated with tin-nickel alloy and Ni (OH) by electroplating 2 Replacing iron and phosphating to obtain the product;
the preparation process of the metal layer comprises the following steps:
(1) Electroplating tin-nickel alloy: taking the corrugated pipe and the woven layer as cathodes and the nickel plate as anodes, and placing the corrugated pipe and the woven layer into electroplating solution containing stannous chloride and stannic sulfate for electroplating for 10-20 min to form a tin-nickel alloy layer;
(2) Electroless Ni plating (OH) 2 : immersing a tin-nickel alloy layer in a glucose and sodium hydroxide mixed solution, slowly adding an equal volume of nickel nitrate solution, and reacting for 10-30 min to form Ni (OH) 2 A nano layer;
(3) Replacement iron: ni (OH) 2 The nano layer is placed in 8-12 mol/L of ferric nitrate aqueous solution and immersed for 50-70 min to form an iron-nickel layer;
(4) Phosphating: taking red phosphorus powder as a phosphorus source, and phosphating for 60-90 min at 420-480 ℃ in an argon atmosphere to obtain a metal layer;
the protective sleeve is one of an interlayer sleeve, a heat-shrinkable tube and an elastomer sleeve;
the protective sleeve comprises the following components in parts by weight: 80 to 90 parts of thermoplastic polyurethane elastomer 60A, 8 to 12 parts of modified stainless steel powder, 5 to 6 parts of carbon black, 0.2 to 0.4 part of antioxidant, 3.2 to 3.6 parts of fluorine-containing polyacrylate and 8 to 10 parts of 4,4' -diphenylmethane diisocyanate;
the protective sleeve is prepared by the following process:
(1) Modification of stainless steel powder:
1.1. taking toluene, adding stainless steel powder and 3- [ bis (2-hydroxyethyl) amino ] propane-triethoxysilane, performing ultrasonic dispersion for 8-12 min, and performing reflux reaction for 4.5-6.0 h; centrifuging at 1200-1300 rpm, taking the precipitate, washing with absolute ethyl alcohol, and drying to obtain coupled stainless steel powder;
1.2. taking 2, 4-diphenylmethane diisocyanate and aniline trimer, heating to 70-90 ℃, stirring and reacting for 2-4 hours, and cooling to 30-40 ℃;
under the protection of nitrogen atmosphere, adding coupling stainless steel powder, 1- (2-amino ethyl) -4-piperidyl methanol and dibutyl tin dilauryl silicate, heating to 40-70 ℃, and stirring for reacting for 3-5 hours to obtain modified stainless steel powder;
(2) Preparation of the protective sleeve:
mixing thermoplastic polyurethane elastomer 70A, fluorine-containing polyacrylate, 4' -diphenylmethane diisocyanate, stainless steel powder, carbon black and an antioxidant, and extruding by the following steps: the temperature of the screw is 160-180 ℃, the temperature of the machine head is 190 ℃, and the rotating speed of the screw is 100-250 r/min, so that the protective sleeve is obtained.
2. A corrosion resistant metal hose for underground piping connection according to claim 1, wherein: the electroplating solution contains 35g/L stannous chloride, 45g/L tin sulfate, 250-300 g/L potassium pyrophosphate, 1.0g/L sodium dodecyl sulfate, 1.5g/L hydroquinone, 0.5g/L saccharin and 1-2 g/L glycine.
3. A corrosion resistant metal hose for underground piping connection according to claim 1, wherein: the electroplating process comprises the following steps: the current density is 10-20 mA/cm 2 Electroplating at 45 ℃ for 10-20 min; the pH of the plating solution was 8.5; the depth of the corrugated pipe and the woven layer in the electroplating solution is 5cm.
4. A corrosion resistant metal hose for underground piping connection according to claim 1, wherein: the concentration of glucose in the mixed solution is 150-200 g/L, and the concentration of sodium hydroxide is 10g/L; the concentration of the nickel nitrate solution is 0.01mol/L.
5. A method of constructing a corrosion resistant metal hose for underground piping connection according to any one of claims 1 to 4, wherein: the method comprises the following steps:
(1) Retesting the axis and the elevation of the pipeline; retest the elevation and axis of the pipe orifice of the pipe-jacking and the joint of the pipe to be connected;
(2) Setting a protective sleeve: confirming the length of the protective sleeve;
(3) Adjusting the soil sampling at the joint: taking soil in the opposite direction of the pipe jacking deviation, and eliminating the elevation deviation and the axis deviation of the two sections of pipes to be connected;
(4) And (3) installing a protection sleeve: after the soil sampling is adjusted at the joint, a protective sleeve is installed;
(5) Determining the pipe diameter and the length of a metal hose; determining the length of a needed metal hose according to the length of the protective sleeve and the included angle of the axes of the two sections of pipelines to be connected;
(6) Processing a metal hose: connecting sections in a horn mouth shape are arranged at two ends of the metal hose;
(7) And (3) installing and constructing a metal hose: and welding the connecting sections at the two ends of the metal hose on the inner wall of the pipeline to be connected.
CN202210679929.6A 2022-06-15 2022-06-15 Corrosion-resistant metal hose for underground pipeline connection and construction method thereof Active CN115199828B (en)

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