CN-121977116-A - Preparation method of PCCP pipe faucet seam sealing system and seam sealing system prepared by same

CN121977116ACN 121977116 ACN121977116 ACN 121977116ACN-121977116-A

Abstract

The invention discloses a preparation method of a PCCP pipe faucet seam sealing system and a seam sealing system prepared by the same, wherein during preparation, an elastic blocking piece is filled in a seam and is divided into a first sub-seam and a second sub-seam, the elastic blocking piece is propped in the seam by adopting a locking mechanism, mortar is poured into the first sub-seam through a reserved first grouting opening, and the locking mechanism is removed after the mortar does not flow; arranging a substrate layer on the upper end surface of the upper opening of the second sub-joint, applying an anti-corrosion coating on the substrate layer to form an anti-corrosion coating, forming a plugging structure with the substrate layer, sealing the second sub-joint, and pouring sealant into the second sub-joint through a reserved second grouting opening; the method is suitable for construction in low temperature environment, the sealing system is suitable for different stress interference and different environmental factors, and can realize durable sealing, and the construction process can be simplified after the front formation of the anticorrosive coating, and the construction speed is high.

Inventors

WANG HUAICHONG
JIN XINGQIANG
ZHAO JIANMING
SONG LIJING
LIU BO
Zhu Datao
LIU JINGYING
KANG JIEFEN

Assignees

新疆水发准水建设开发有限公司
中建材苏州防水研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260213

Claims (20)

1. A method of making a PCCP pipe socket joint seal system, the method comprising: Filling an elastic blocking piece into the joint, dividing the joint into a first sub-joint and a second sub-joint which are sequentially arranged from inside to outside, and reserving a first grouting opening communicated with the first sub-joint; The elastic blocking piece is propped against the joint by adopting a locking mechanism, mortar is poured into the first sub-joint through the first grouting opening, and the locking mechanism is removed after the mortar does not flow; Arranging a substrate layer on the upper end surface of the upper opening of the second sub-joint, then applying polyurethane anti-corrosion coating on at least the substrate layer to form an anti-corrosion coating, forming a plugging structure with the substrate layer, sealing the second sub-joint, reserving a second grouting opening communicated with the second sub-joint, and grouting polyurethane sealant into the second sub-joint through the second grouting opening; According to the test method of JC/T942-2022, the peel strength between the elastic barrier and the mortar and between the elastic barrier and the polyurethane sealant is less than or equal to 0.1N/mm.
2. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the substrate layer has a void structure formed therein, the polyurethane corrosion resistant coating being penetrable onto the upper end surface through the void structure.
3. The method of making a PCCP pipe socket joint seal system of claim 2, wherein the bond strength between the corrosion protection coating and the upper end surface is 2.5MPa or greater according to the test method of GB/T19250-2013.
4. The method of preparing a PCCP pipe socket joint seal system as recited in claim 1, wherein the width of the upper opening of the second sub-joint, the width of the base layer, the width of the corrosion protection coating are sequentially increased, and/or, The thickness of the corrosion protection coating in the radial direction of the PCCP tube is 1.0-5.0mm, further 1.0-3.0mm, and/or, The width of the overlap region between the base layer and the upper end face is 20mm or more, further 50mm or more, further 100mm or more, and still further 100-500mm.
5. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the base layer is adhered to the upper end surface prior to applying the polyurethane corrosion protection coating to at least the base layer; further, the method for adhering the base layer comprises the steps of coating the polyurethane anticorrosive paint on the upper end face of the upper opening of the second sub-joint, and then attaching two sides of the base layer to the area coated with the polyurethane anticorrosive paint.
6. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the material of the base layer comprises a fibrous porous flexible material and/or a foamed polymer-based material, further wherein the fibrous porous flexible material comprises a nonwoven fabric and the foamed polymer-based material comprises a polyurethane foam.
7. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the first grout port is provided on top of the elastomeric barrier and the second grout port is provided on top of the shutoff structure.
8. The method for preparing the PCCP pipe socket joint sealing system according to claim 1, wherein the anticorrosive coating is formed by coating a one-component polyurethane anticorrosive paint, and the raw materials of the one-component polyurethane anticorrosive paint comprise a bio-based polyol composition, polyisocyanate with the mass content of NCO groups being 20% or more, a filler, an anti-sagging additive, a composite catalyst and a solvent; The bio-based polyol composition comprises a first unit and a second unit, wherein the first unit comprises a bio-based polyol, and the bio-based polyol is prepared by the following steps of enabling castor oil and peroxy acid to undergo an epoxidation reaction to generate a first intermediate, enabling the first intermediate and a compound shown in a formula (I) to undergo an epoxy ring-opening reaction to generate a second intermediate, and enabling the second intermediate and the compound shown in a formula (II) to undergo an esterification reaction to generate the bio-based polyol; In formula (I), R 1 is selected from C 2-6 alkylene; In formula (II), R 2 、R 3 is independently selected from C 1-3 alkylene, R 4 is selected from C 1-3 alkyl or hydroxy-substituted C 1-3 alkyl; The second unit comprises a compound of formula (III); In formula (III), R 5 、R 6 、R 7 is independently selected from C 2-10 alkylene, double bond interrupted C 2-10 alkylene, epoxy interrupted C 2-10 alkylene, R 8 、R 9 、R 10 is independently selected from C 2-10 alkyl, alkenyl C 2-10 alkyl, epoxy C 2-10 alkyl, double bond interrupted C 2-10 alkyl, epoxy interrupted C 2-10 alkyl; the composite catalyst consists of a main catalyst and a cocatalyst, wherein the main catalyst comprises dibutyl tin dilaurate and/or stannous octoate, and the cocatalyst comprises N, N-dimethyl cyclohexylamine.
9. The preparation method of the PCCP pipe bell and spigot joint sealing system according to claim 8, wherein the raw materials of the single-component polyurethane anticorrosive paint comprise, by weight, 30-50 parts of bio-based polyol, 15-25 parts of polyisocyanate with the mass content of NCO groups being more than or equal to 20%, 6-10 parts of compound shown in formula (III), 10-20 parts of filler, 2-5 parts of anti-sagging auxiliary agent, 0.3-1.5 parts of composite catalyst and 5-20 parts of solvent.
10. The method for producing a PCCP pipe socket joint seal system as claimed in claim 8, wherein the mass ratio of the main catalyst to the co-catalyst in the composite catalyst is 2-3:1, and/or, The filler comprises nano silicon dioxide and talcum powder, and further, in the filler, the feeding mass ratio of the nano silicon dioxide to the talcum powder is 1:3-5, and/or, The polyisocyanate is polymethylene polyphenyl isocyanate and/or hexamethylene diisocyanate trimer, and/or, The anti-sagging auxiliary agent is one or a combination of more selected from hydrogenated castor oil, polyamide wax and fumed silica, and/or, The solvent is a mixed solvent of anhydrous toluene and ethyl acetate according to the mass ratio of 1:1-2.
11. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the material of the resilient barrier is a polyolefin material.
12. The method of making a PCCP pipe socket joint seal system of claim 11, wherein the polyolefin material comprises a combination of one, two or more selected from the group consisting of polyethylene, polystyrene, ethylene-propylene copolymer, ethylene-butene copolymer, propylene-butene copolymer.
13. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the thickness of the resilient barrier member in the radial direction of the PCCP pipe is 0.05-0.2 times the height of the joint in the radial direction of the PCCP pipe, and/or wherein the resilient barrier member is an interference fit with the inner wall of the joint.
14. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the ratio of the height of the first sub-joint in the radial direction of the PCCP pipe to the height of the second sub-joint in the radial direction of the PCCP pipe is 1:0.2-1.0, and/or the mortar is a polymer cement waterproof mortar meeting product standard JC/T984.
15. The method of claim 1, further comprising drying the surface of the resilient barrier and the surface of the second sub-seam, respectively, to a moisture content of 6% or less prior to disposing the closure structure, and/or wherein the locking mechanism comprises a rubber strapping that is capable of positioning the resilient barrier in the seam.
16. The method of making a PCCP pipe socket joint seal system of claim 1, wherein the polyurethane sealant comprises an a-component and a B-component; The raw materials of the component A comprise polyalcohol, a first bio-based polyalcohol composition and polyisocyanate; the raw materials of the component B comprise a chain extender, a cross-linking agent, a second bio-based polyol composition, a filler and a catalyst; The first bio-based polyol composition, the second bio-based polyol composition each independently comprise a first unit and a second unit; The first unit comprises a bio-based polyol, and the bio-based polyol is prepared by the following steps of enabling castor oil and peroxy acid to undergo an epoxidation reaction to generate a first intermediate, enabling the first intermediate and a compound shown as a formula (I) to undergo an epoxy ring-opening reaction to generate a second intermediate, and enabling the second intermediate and a compound shown as a formula (II) to undergo an esterification reaction to generate the bio-based polyol; In formula (I), R 1 is selected from C 2-6 alkylene; In formula (II), R 2 、R 3 is independently selected from C 1-3 alkylene, R 4 is selected from C 1-3 alkyl or hydroxy-substituted C 1-3 alkyl; The second unit comprises a compound of formula (III); In formula (III), R 5 、R 6 、R 7 is independently selected from C 2-10 alkylene, double bond interrupted C 2-10 alkylene, epoxy interrupted C 2-10 alkylene, and R 8 、R 9 、R 10 is independently selected from C 2-10 alkyl, alkenyl C 2-10 alkyl, epoxy C 2-10 alkyl, double bond interrupted C 2-10 alkyl, epoxy interrupted C 2-10 alkyl.
17. The method of preparing a PCCP pipe socket joint seal system as claimed in claim 16, wherein the raw materials of the A component comprise, in parts by weight, 70-80 parts of polyol, 5-10 parts of first bio-based polyol composition, 10-20 parts of polyisocyanate, and/or, In parts by weight, in the raw materials of the component B, 5-10 parts of chain extender, 60-70 parts of cross-linking agent, 5-10 parts of second bio-based polyol composition, 10-20 parts of filler and 0.1-0.5 part of catalyst, and/or, The feeding mass ratio of the component A to the component B is 1:0.8-1.2.
18. The method of preparing a PCCP pipe socket joint seal system as claimed in claim 16, wherein in the A component, the polyol is polyether glycol and/or polyether triol, further wherein the polyether glycol has an average molecular weight of 2000-6000, the polyether triol has an average molecular weight of 3000-8000, and/or, The component A comprises polyisocyanate, and further comprises one or a combination of more selected from toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate, and/or, In the component B, the chain extender comprises a sterically hindered amine chain extender, further, the sterically hindered amine chain extender comprises one or more selected from the group consisting of dimethyl thiotoluene diamine, 4' -di (alkylamino) -diphenylmethane, N ' -dialkylphenylenediamine, 4' -di (alkylamino) -dicyclohexylmethane and polyaspartic acid ester, and/or, In the component B, the cross-linking agent is selected from polyether triol with average molecular weight of 3000-8000 and/or, In the component B, the filler is selected from one or a combination of more of calcium carbonate, kaolin, talcum powder and mica powder, and/or, In the component B, the catalyst is composed of an organic bismuth catalyst and an amine catalyst, further, the organic bismuth catalyst comprises bismuth isooctanoate and/or bismuth neodecanoate, the amine catalyst comprises triethylene diamine and/or dimethylaminoethyl ether, and further, the feeding mass ratio of the organic bismuth catalyst to the amine catalyst is 1:0.5-2.
19. A method of making a PCCP pipe socket joint seal system according to claim 8 or 16, wherein in the process of making the bio-based polyol, the epoxidation reaction is carried out at 40-60 ℃ and/or in the presence of an alkaline substance, further comprising an alkali metal carbonate and/or an alkali metal hydroxide; Still further, the alkali metal carbonate comprises sodium carbonate and/or potassium carbonate, and the alkali metal hydroxide comprises sodium hydroxide and/or potassium hydroxide; further, the addition mass of the alkaline substance accounts for 0.01% -0.3% of the addition mass of the castor oil; And/or the number of the groups of groups, The feeding mass ratio of the castor oil to the peroxy acid is 6-8:1, and/or, The peroxyacid comprises trifluoroperoxyacetic acid.
20. The method of preparing a PCCP pipe socket joint seal system as claimed in claim 8 or 16, wherein the epoxy ring-opening reaction is performed at 120-160 ℃ during the preparation of the bio-based polyol, and/or, The epoxy ring-opening reaction is carried out in the presence of a tetraalkyl amine halide, further, the tetraalkyl amine halide comprises tetrabutylammonium bromide, further, the tetraalkyl amine halide is added in an amount of 0.5 to 4.0% by mass based on the added mass of the compound represented by the formula (I), and/or, Controlling the feeding mass ratio of the compound shown in the formula (I) to the castor oil to be 1.05-1.25:1, and/or, In the formula (I), R 1 is selected from ethylene, propylene and butylene.

Description

Preparation method of PCCP pipe faucet seam sealing system and seam sealing system prepared by same Technical Field The invention relates to the technical field of PCCP pipe faucet sealing, in particular to a preparation method of a PCCP pipe faucet seam sealing system and a seam sealing system prepared by the same. Background The prestressed steel cylinder concrete pipe (PRESTRESSED CONCRETE CYLINDER PIPE, PCCP for short) is a composite pipe material formed by compositing various materials such as high-strength prestressed steel wires, steel cylinders, concrete, cement mortar and the like, combines the rigidity of the concrete, the tensile property of the steel and the like, and has remarkable advantages in large-caliber (for example, the pipe diameter can be 2-5 meters and the like), high-pressure and long-distance hydrophobic engineering. At present, PCCP is mainly used for large and important water delivery projects, such as urban water supply main pipelines and industrial water pipelines, large water regulating projects, power plant circulating water pipelines and pressure tunnels, and large water delivery main pipelines for agricultural irrigation. The PCCP bell and spigot is a key connection part of a PCCP pipe, and is also a weak node of the whole pipeline sealing system, the sealing performance of the PCCP bell and spigot directly influences the overall performance of the pipeline, and once the PCCP bell and spigot is damaged, moisture, sulfate, chloride ions and the like can invade to corrode the prestressed steel wire. Steel wire corrosion is the most dominant and damaging failure mode of PCCP and once the steel wire breaks, the prestress is lost and the pipe body may burst. At present, a joint groove formed at a joint after PCCP socket installation is completed is filled and sealed by adopting cement mortar joint filling materials, for example, cement mortar with the compressive strength reaching 20MPa is adopted, the joint groove is filled and sealed after being stirred by adding water on site, but the quality of water and the addition amount of water are uncontrollable, so that cracking occurs in a mortar curing and forming process, water hammer phenomenon, geological sedimentation and other phenomena can be difficult to avoid in the service process of a pipeline, particularly in desert, gobi and desert areas in northeast and northwest of China, wind and sand are more, the temperature difference is large, the humidity is low, the highest temperature in the daytime in autumn is about 20 ℃, the night air temperature is often below-5 ℃, and the unique application conditions after superposition of various factors bring higher requirements to the workability of a sealing system of the joint groove and the durability of the filling and sealing materials at the joint groove under the influence of different stress and different environmental factors. It should be noted that the information disclosed in the above background section is only for understanding the background of the present application, and thus the background section of the present application may contain background information about the problem or environment of the present application, not necessarily describe the prior art. Accordingly, inclusion in the background section is not an admission of prior art by the applicant. Disclosure of Invention The invention aims to overcome one or more defects in the prior art and provides an improved preparation method of a PCCP pipe faucet seam sealing system which can be suitable for realizing durable sealing under different stress interferences and different environmental factors. Furthermore, the PCCP pipe faucet seam sealing system can be quickly constructed and is convenient to construct in a low-temperature low-humidity environment, and is particularly suitable for areas with large temperature difference and low humidity. The invention also provides a PCCP pipe faucet seam sealing system prepared by the method. In order to achieve the above purpose, the invention adopts a technical scheme that: a method of making a PCCP pipe socket joint seal system, the method comprising: Filling an elastic blocking piece into the joint, dividing the joint into a first sub-joint and a second sub-joint which are sequentially arranged from inside to outside, and reserving a first grouting opening communicated with the first sub-joint; The elastic blocking piece is propped against the joint by adopting a locking mechanism, mortar is poured into the first sub-joint through the first grouting opening, and the locking mechanism is removed after the mortar does not flow; Arranging a substrate layer on the upper end surface of the upper opening of the second sub-joint, then applying polyurethane anti-corrosion coating on at least the substrate layer to form an anti-corrosion coating, forming a plugging structure with the substrate layer, sealing the second sub-joint, reserving a second grouting opening communicated