CN109098214A - A kind of building basement concrete water-proof construction method - Google Patents

A kind of building basement concrete water-proof construction method Download PDF

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Publication number
CN109098214A
CN109098214A CN201810939421.9A CN201810939421A CN109098214A CN 109098214 A CN109098214 A CN 109098214A CN 201810939421 A CN201810939421 A CN 201810939421A CN 109098214 A CN109098214 A CN 109098214A
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parts
waterproof
water
basement
waterproof roll
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叶良锐
叶莉婷
邬敏
刘甫山
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Lujiang Rong Rui Construction Engineering Co Ltd
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Lujiang Rong Rui Construction Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/014Additives containing two or more different additives of the same subgroup in C08K

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a kind of building basement concrete water-proof construction methods, comprising the following steps: 1) surface for coagulating soil to basement is handled, and then to treated, concrete surface sprays waterproof priming paint;2) pass through marine glue laying water-proof coiled material to the concrete surface after spraying waterproof priming paint;3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material.The present invention carries out waterproof, good water-proof effect by waterproof priming paint, waterproof roll and three kinds of water-repellent paint different waterproof layers, and basement is not easy humidity;By multilayer proofing, even if wherein one layer of waterproof material is destroyed by external force, other waterproof layers can still play waterproof action;Middle layer carries out waterproof by special waterproof roll, and waterproof roll tensile strength is high, abrasive resistance is strong, can keep out stronger external force pressure, be hardly damaged, improve the service life of waterproof layer.

Description

A kind of building basement concrete water-proof construction method
Technical field
The present invention relates to technical field of building construction, specifically a kind of building basement concrete water-proof construction method.
Background technique
Basement refers to that room floors are lower than half of the height more than the stud of outdoor ground level.Multilayer and High-rise needs deeper basis, to build basement under architecture bottom layer, can both increase use using this height Area, and room heart backfill can be saved, it can be said to be both economical.Basement is built below housing bottom, can be improved for building Ground efficiency.Some skyscraper bases buried depth is very big, makes full use of this depth to build basement, economic effect and use Effect is all good.Basement is divided by function, there is basement without protective requirement and emptying basement;By structural material point, have brick wall structure and Concrete structure basement has full basement and partly-exposed basement by structural form point.
The exterior wall and bottom plate of basement are all buried in underground, by the infiltration of water in soil and underground water, therefore, moistureproof and waterproof Problem is a major issue to be solved in design of basement.Existing concrete of basement waterproof construction method often only Waterproof is carried out by a kind of mode, waterproof performance is limited, and when waterproof layer is by stronger external force is easily damaged, and causes Waterproof effect is bad.
Summary of the invention
The purpose of the present invention is to provide a kind of building basement concrete water-proof construction methods, to solve above-mentioned background The problem of being proposed in technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of building basement concrete water-proof construction method, comprising the following steps:
1) surface for coagulating soil to basement is handled, and then to treated, concrete surface sprays waterproof priming paint;
2) pass through marine glue laying water-proof coiled material to the concrete surface after spraying waterproof priming paint;
3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material;
The waterproof roll includes the following raw material according to parts by weight: 80-100 parts of ethylene propylene diene rubber, alkyd resin 30- 50 parts, 20-30 parts of carbon black, 10-18 parts of trimellitate, 8-15 parts of zinc carbonate, 2-6 parts of dichlorobenzoperoxide, adjacent benzene two 6-12 parts of formic acid dibutyl ester, 3-7 parts of dibutyl sebacate, 2-4 parts of azodicarbonamide, 3-5 parts of softening agent, 1-2 parts of anti-aging agent, 1-2 parts of coagulator.
As a further solution of the present invention: the waterproof roll includes the following raw material according to parts by weight: EPDM 85-95 parts of rubber, 35-45 parts of alkyd resin, 22-28 parts of carbon black, 12-16 parts of trimellitate, 10-13 parts of zinc carbonate, dichloro 3-5 parts of benzoyl peroxide, 8-10 parts of dibutyl phthalate, 4-6 parts of dibutyl sebacate, azodicarbonamide 2.5- 3.5 parts, 3.5-4.5 parts of softening agent, 1.2-1.8 parts of anti-aging agent, 1.2-1.8 parts of coagulator.
As further scheme of the invention: the waterproof roll includes the following raw material according to parts by weight: ternary second Third 90 parts of rubber, 40 parts of alkyd resin, 25 parts of carbon black, 14 parts of trimellitate, 12 parts of zinc carbonate, dichlorobenzoperoxide 5 Part, 10 parts of dibutyl phthalate, 4 parts of dibutyl sebacate, 3 parts of azodicarbonamide, 4 parts of softening agent, anti-aging agent 1.5 Part, 1.5 parts of coagulator.
As the present invention further scheme: the preparation method of the waterproof roll the following steps are included:
1) ethylene propylene diene rubber, alkyd resin are smashed it through into 50-100 mesh, carbon black, zinc carbonate, dichloro peroxide is added Change benzoyl, softening agent, anti-aging agent, be put into open mill after mixing, be kneaded 20-30min under the conditions of 120-150 DEG C, Discharging, cooling, standing 1-2h, acquisition mixing product I.
2) the mixing product I that step 1) obtains is smashed it through into 80-120 mesh, trimellitate, phthalic acid is added Dibutyl ester, azodicarbonamide, coagulator, are put into open mill after mixing, are kneaded 1-2h under the conditions of 100-120 DEG C, Discharging, cooling, standing 12-18h, acquisition mixing product II;
3) step 2) is obtained to be kneaded in the addition open mill of product II and carries out back mixing, back mixing 5-10min, back mixing temperature is 90-110 DEG C, obtain back mixing product;
4) the back mixing product for obtaining step 3), which is sent on vulcanizing press, carries out press cure 5-10min, curing temperature It is 100-120 DEG C, pressure 30-50MPa is cut after discharging, cooling to get waterproof roll.
Compared with prior art, the beneficial effects of the present invention are:
The present invention carries out waterproof, waterproof effect by waterproof priming paint, waterproof roll and three kinds of water-repellent paint different waterproof layers Fruit is good, and basement is not easy humidity;By multilayer proofing, even if wherein one layer of waterproof material is destroyed by external force, other waterproof layers Waterproof action can still be played;Middle layer carries out waterproof by special waterproof roll, and waterproof roll tensile strength is high, wear-resisting Ability is strong, can keep out stronger external force pressure, be hardly damaged, and improves the service life of waterproof layer.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all Belong to the scope of protection of the invention.
Embodiment 1
A kind of building basement concrete water-proof construction method, which comprises the following steps:
1) surface for coagulating soil to basement is handled, then to treated concrete surface spray-applied primer;
2) pass through marine glue laying water-proof coiled material to the concrete surface after spray-applied primer;
3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material;
The waterproof roll includes the following raw material according to parts by weight: 80 parts of ethylene propylene diene rubber, 30 parts of alkyd resin, charcoal Black 20 parts, 10 parts of trimellitate, 8 parts of zinc carbonate, 2 parts of dichlorobenzoperoxide, 6 parts of dibutyl phthalate, the last of the ten Heavenly stems two 3 parts of dibutyl phthalate, 2 parts of azodicarbonamide, 3 parts of softening agent, 1 part of anti-aging agent, 1 part of coagulator.
Wherein, the waterproof roll preparation method the following steps are included:
1) ethylene propylene diene rubber, alkyd resin are smashed it through into 50 meshes, carbon black, zinc carbonate, dichloro benzoyl peroxide is added Formyl, softening agent, anti-aging agent, are put into open mill after mixing, 20min are kneaded under the conditions of 120 DEG C, discharging, cooling are quiet 1h is set, obtains and is kneaded product I.
2) the mixing product I that step 1) obtains is smashed it through into 80 meshes, trimellitate, two fourth of phthalic acid is added Ester, azodicarbonamide, coagulator, are put into open mill after mixing, and 1h is kneaded under the conditions of 100 DEG C, discharge, is cooling, 12h is stood, obtains and is kneaded product II;
3) step 2) being obtained to be kneaded in the addition open mill of product II and carries out back mixing, back mixing 5min, back mixing temperature is 90 DEG C, Obtain back mixing product;
4) the back mixing product for obtaining step 3), which is sent on vulcanizing press, carries out press cure 5min, and curing temperature is It 100 DEG C, pressure 30MPa, cuts after discharging, cooling to get waterproof roll.
Embodiment 2
A kind of building basement concrete water-proof construction method, which comprises the following steps:
1) surface for coagulating soil to basement is handled, then to treated concrete surface spray-applied primer;
2) pass through marine glue laying water-proof coiled material to the concrete surface after spray-applied primer;
3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material;
The waterproof roll includes the following raw material according to parts by weight: 85 parts of ethylene propylene diene rubber, 35 parts of alkyd resin, charcoal Black 22 parts, 12 parts of trimellitate, 10 parts of zinc carbonate, 3 parts of dichlorobenzoperoxide, 10 parts of dibutyl phthalate, the last of the ten Heavenly stems 6 parts of adipate, 3.5 parts of azodicarbonamide, 4.5 parts of softening agent, 1.8 parts of anti-aging agent, 1.8 parts of coagulator.
Wherein, the waterproof roll preparation method the following steps are included:
1) ethylene propylene diene rubber, alkyd resin are smashed it through into 80 meshes, carbon black, zinc carbonate, dichloro benzoyl peroxide is added Formyl, softening agent, anti-aging agent, are put into open mill after mixing, 25min are kneaded under the conditions of 135 DEG C, discharging, cooling are quiet 1.5h is set, obtains and is kneaded product I.
2) the mixing product I that step 1) obtains is smashed it through into 100 meshes, trimellitate, phthalic acid two is added Butyl ester, azodicarbonamide, coagulator, are put into open mill after mixing, and 1.5h is kneaded under the conditions of 110 DEG C, discharge, is cold But, 15h is stood, obtains and is kneaded product II;
3) step 2) is obtained to be kneaded in the addition open mill of product II and carries out back mixing, back mixing 7min, back mixing temperature is 100 DEG C, obtain back mixing product;
4) the back mixing product for obtaining step 3), which is sent on vulcanizing press, carries out press cure 8min, and curing temperature is It 110 DEG C, pressure 40MPa, cuts after discharging, cooling to get waterproof roll.
Embodiment 3
A kind of building basement concrete water-proof construction method, which comprises the following steps:
1) surface for coagulating soil to basement is handled, then to treated concrete surface spray-applied primer;
2) pass through marine glue laying water-proof coiled material to the concrete surface after spray-applied primer;
3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material;
The waterproof roll includes the following raw material according to parts by weight: 90 parts of ethylene propylene diene rubber, 40 parts of alkyd resin, charcoal Black 25 parts, 14 parts of trimellitate, 12 parts of zinc carbonate, 5 parts of dichlorobenzoperoxide, 10 parts of dibutyl phthalate, the last of the ten Heavenly stems 4 parts of adipate, 3 parts of azodicarbonamide, 4 parts of softening agent, 1.5 parts of anti-aging agent, 1.5 parts of coagulator.
Wherein, the waterproof roll preparation method the following steps are included:
1) ethylene propylene diene rubber, alkyd resin are smashed it through into 80 meshes, carbon black, zinc carbonate, dichloro benzoyl peroxide is added Formyl, softening agent, anti-aging agent, are put into open mill after mixing, 25min are kneaded under the conditions of 135 DEG C, discharging, cooling are quiet 1.5h is set, obtains and is kneaded product I.
2) the mixing product I that step 1) obtains is smashed it through into 100 meshes, trimellitate, phthalic acid two is added Butyl ester, azodicarbonamide, coagulator, are put into open mill after mixing, and 1.5h is kneaded under the conditions of 110 DEG C, discharge, is cold But, 15h is stood, obtains and is kneaded product II;
3) step 2) is obtained to be kneaded in the addition open mill of product II and carries out back mixing, back mixing 7min, back mixing temperature is 100 DEG C, obtain back mixing product;
4) the back mixing product for obtaining step 3), which is sent on vulcanizing press, carries out press cure 8min, and curing temperature is It 110 DEG C, pressure 40MPa, cuts after discharging, cooling to get waterproof roll.
Embodiment 4
A kind of building basement concrete water-proof construction method, which comprises the following steps:
1) surface for coagulating soil to basement is handled, then to treated concrete surface spray-applied primer;
2) pass through marine glue laying water-proof coiled material to the concrete surface after spray-applied primer;
3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material;
The waterproof roll includes the following raw material according to parts by weight: 95 parts of ethylene propylene diene rubber, 45 parts of alkyd resin, charcoal Black 28 parts, 16 parts of trimellitate, 13 parts of zinc carbonate, 5 parts of dichlorobenzoperoxide, 8 parts of dibutyl phthalate, the last of the ten Heavenly stems two 4 parts of dibutyl phthalate, 2.5 parts of azodicarbonamide, 3.5 parts of softening agent, 1.2 parts of anti-aging agent, 1.2 parts of coagulator.
Wherein, the waterproof roll preparation method the following steps are included:
1) ethylene propylene diene rubber, alkyd resin are smashed it through into 80 meshes, carbon black, zinc carbonate, dichloro benzoyl peroxide is added Formyl, softening agent, anti-aging agent, are put into open mill after mixing, 25min are kneaded under the conditions of 135 DEG C, discharging, cooling are quiet 1.5h is set, obtains and is kneaded product I.
2) the mixing product I that step 1) obtains is smashed it through into 100 meshes, trimellitate, phthalic acid two is added Butyl ester, azodicarbonamide, coagulator, are put into open mill after mixing, and 1.5h is kneaded under the conditions of 110 DEG C, discharge, is cold But, 15h is stood, obtains and is kneaded product II;
3) step 2) is obtained to be kneaded in the addition open mill of product II and carries out back mixing, back mixing 7min, back mixing temperature is 100 DEG C, obtain back mixing product;
4) the back mixing product for obtaining step 3), which is sent on vulcanizing press, carries out press cure 8min, and curing temperature is It 110 DEG C, pressure 40MPa, cuts after discharging, cooling to get waterproof roll.
Embodiment 5
A kind of building basement concrete water-proof construction method, which comprises the following steps:
1) surface for coagulating soil to basement is handled, then to treated concrete surface spray-applied primer;
2) pass through marine glue laying water-proof coiled material to the concrete surface after spray-applied primer;
3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material;
The waterproof roll includes the following raw material according to parts by weight: 100 parts of ethylene propylene diene rubber, 50 parts of alkyd resin, 30 parts of carbon black, 18 parts of trimellitate, 15 parts of zinc carbonate, 6 parts of dichlorobenzoperoxide, 12 parts of dibutyl phthalate, 7 parts of dibutyl sebacate, 4 parts of azodicarbonamide, 5 parts of softening agent, 2 parts of anti-aging agent, 2 parts of coagulator.
Wherein, the waterproof roll preparation method the following steps are included:
1) ethylene propylene diene rubber, alkyd resin are smashed it through into 100 meshes, carbon black, zinc carbonate, dichloro benzoyl peroxide is added Formyl, softening agent, anti-aging agent, are put into open mill after mixing, 30min are kneaded under the conditions of 150 DEG C, discharging, cooling are quiet 2h is set, obtains and is kneaded product I.
2) the mixing product I that step 1) obtains is smashed it through into 120 meshes, trimellitate, phthalic acid two is added Butyl ester, azodicarbonamide, coagulator, are put into open mill after mixing, and 2h is kneaded under the conditions of 120 DEG C, discharge, is cold But, 18h is stood, obtains and is kneaded product II;
3) step 2) is obtained to be kneaded in the addition open mill of product II and carries out back mixing, back mixing 10min, back mixing temperature is 110 DEG C, obtain back mixing product;
4) the back mixing product for obtaining step 3), which is sent on vulcanizing press, carries out press cure 10min, and curing temperature is It 120 DEG C, pressure 50MPa, cuts after discharging, cooling to get waterproof roll.
Comprehensive survey is carried out to the concrete of basement surface waterproofing layer after the waterproof construction method construction using embodiment 1-5 Examination, test result are as shown in table 1.
Table 1
As can be seen that the present invention is different by waterproof priming paint, waterproof roll and three kinds of water-repellent paint from result above Waterproof layer carries out waterproof, good water-proof effect, and basement is not easy humidity;By multilayer proofing, waterproof layer comprehensive tensile is high, energy Stronger external force pressure is enough kept out, is hardly damaged, the service life of waterproof layer is improved.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (5)

1. a kind of building basement concrete water-proof construction method, which comprises the following steps:
1) surface for coagulating soil to basement is handled, and then to treated, concrete surface sprays waterproof priming paint;
2) pass through marine glue laying water-proof coiled material to the concrete surface after spraying waterproof priming paint;
3) to the concrete surface sprayed polyurethane waterproof paint of laying water-proof coiled material;
The waterproof roll includes the following raw material according to parts by weight: 80-100 parts of ethylene propylene diene rubber, alkyd resin 30-50 Part, 20-30 parts of carbon black, 10-18 parts of trimellitate, 8-15 parts of zinc carbonate, 2-6 parts of dichlorobenzoperoxide, O-phthalic 6-12 parts of dibutyl phthalate, 2-4 parts of azodicarbonamide, 3-5 parts of softening agent, 1-2 parts of anti-aging agent, coagulates at 3-7 parts of dibutyl sebacate Gu 1-2 parts of agent.
2. building basement concrete water-proof construction method according to claim 1, which is characterized in that the waterproof roll Material includes the following raw material according to parts by weight: 85-95 parts of ethylene propylene diene rubber, 35-45 parts of alkyd resin, 22-28 parts of carbon black, partially 12-16 parts of benzenetricarboxylic acid ester, 10-13 parts of zinc carbonate, 3-5 parts of dichlorobenzoperoxide, 8-10 parts of dibutyl phthalate, the last of the ten Heavenly stems 4-6 parts of adipate, 2.5-3.5 parts of azodicarbonamide, 3.5-4.5 parts of softening agent, 1.2-1.8 parts of anti-aging agent, coagulator 1.2-1.8 part.
3. building basement concrete water-proof construction method according to claim 2, which is characterized in that the waterproof roll Material includes the following raw material according to parts by weight: 90 parts of ethylene propylene diene rubber, 40 parts of alkyd resin, 25 parts of carbon black, trimellitate 14 parts, 12 parts of zinc carbonate, 5 parts of dichlorobenzoperoxide, 10 parts of dibutyl phthalate, 4 parts of dibutyl sebacate, azo 3 parts of diformamide, 4 parts of softening agent, 1.5 parts of anti-aging agent, 1.5 parts of coagulator.
4. a kind of preparation method of waterproof roll a method according to any one of claims 1-3, which comprises the following steps:
1) ethylene propylene diene rubber, alkyd resin are smashed it through into 50-100 mesh, carbon black, zinc carbonate, dichloro benzoyl peroxide is added Formyl, softening agent, anti-aging agent, are put into open mill after mixing, and 20-30min is kneaded under the conditions of 120-150 DEG C, discharge, It is cooling, 1-2h is stood, obtains and is kneaded product I.
2) the mixing product I that step 1) obtains is smashed it through into 80-120 mesh, trimellitate, two fourth of phthalic acid is added Ester, azodicarbonamide, coagulator, are put into open mill after mixing, and 1-2h is kneaded under the conditions of 100-120 DEG C, discharge, It is cooling, 12-18h is stood, obtains and is kneaded product II;
3) step 2) is obtained to be kneaded in the addition open mill of product II and carries out back mixing, back mixing 5-10min, back mixing temperature is 90-110 DEG C, obtain back mixing product;
4) the back mixing product for obtaining step 3), which is sent on vulcanizing press, carries out press cure 5-10min, and curing temperature is It 100-120 DEG C, pressure 30-50MPa, cuts after discharging, cooling to get waterproof roll.
5. a kind of waterproof roll a method according to any one of claims 1-3.
CN201810939421.9A 2018-08-17 2018-08-17 A kind of building basement concrete water-proof construction method Pending CN109098214A (en)

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CN110924542A (en) * 2019-11-24 2020-03-27 湖南圣人防水材料有限公司 Waterproof application of water-soluble composite resin in military shelter facilities
CN111501850A (en) * 2020-04-25 2020-08-07 浙江欣成建设有限公司 Waterproof and moistureproof concrete construction process
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CN111501850A (en) * 2020-04-25 2020-08-07 浙江欣成建设有限公司 Waterproof and moistureproof concrete construction process
CN113969595A (en) * 2020-07-24 2022-01-25 庆泰树脂化学股份有限公司 Waterproof construction method for building foundation
CN113089732A (en) * 2021-04-27 2021-07-09 中国二冶集团有限公司 Construction method for foundation protection at underground water level

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Application publication date: 20181228