CN114250947A - High-compression-resistance high-flame-retardant spraying polyurethane hard foam refrigeration house terrace and construction process thereof - Google Patents
High-compression-resistance high-flame-retardant spraying polyurethane hard foam refrigeration house terrace and construction process thereof Download PDFInfo
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- 238000005507 spraying Methods 0.000 title claims abstract description 39
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- 238000010276 construction Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 25
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- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/02044—Separate elements for fastening to an underlayer
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/0215—Flooring or floor layers composed of a number of similar elements specially adapted for being adhesively fixed to an underlayer; Fastening means therefor; Fixing by means of plastics materials hardening after application
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/18—Separately-laid insulating layers; Other additional insulating measures; Floating floors
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/18—Separately-laid insulating layers; Other additional insulating measures; Floating floors
- E04F15/182—Underlayers coated with adhesive or mortar to receive the flooring
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/02044—Separate elements for fastening to an underlayer
- E04F2015/0205—Separate elements for fastening to an underlayer with load-supporting elongated furring elements between the flooring elements and the underlayer
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to a high-pressure-resistance high-flame-retardant spraying polyurethane hard foam refrigeration house terrace and a construction process thereof. The invention relates to a terrace for a refrigeration house, which comprises a keel frame formed by a plurality of keels, wherein the keels are formed by bonding a plurality of polyurethane pultrusion profile leftover materials which are vertically arranged, the height of the polyurethane pultrusion profile leftover materials is matched with the design thickness of a ground heat-insulating layer of the refrigeration house, flame-retardant polyurethane rigid foam is sprayed between the adjacent keels, the spraying thickness of the flame-retardant polyurethane rigid foam is equal to the height of the keel frame, and a prefabricated reinforced concrete plate is laid or reinforced concrete is directly poured after the upper part of the keel frame is leveled. The invention solves the technical requirements of the refrigeration house terrace on low density of the heat-insulating material, B1-grade flame retardance, seamless connection and compression strength of more than or equal to 500 KPa.
Description
Technical Field
The invention relates to a high-compression-resistance high-flame-retardant spraying polyurethane hard foam terrace for a refrigeration house, and belongs to the technical field of heat preservation in the refrigeration house.
Background
In the traditional design and construction process of a refrigeration house, the bearing design of the ground generally requires more than or equal to 350KPa, and some of the bearing design even achieves more than or equal to 500KPa, in order to meet the requirement of cargo carrying walking of transport vehicles such as forklifts and the like, the ground which can preserve heat and bear load is mostly paved layer by adopting polystyrene extruded sheets (XPS). The heat insulation performance of the XPS plate is poorer than that of polyurethane foam, a gap formed by layer-by-layer paving has a cold bridge hidden danger, a certain gap correction coefficient is required to assist, and meanwhile, the existence of the gap is beneficial to the permeation of small molecular water vapor, so that the phenomenon of 'cold running' is frequently caused. It is no problem that the polyurethane foam reaches 350KPa or more and even 500KPa or more, but the density is generally at least 50kg/m when the polyurethane foam reaches 350KPa or more3Above, the general density of the product is 65kg/m when the product reaches more than or equal to 500KPa3Above, the B1 grade flame retardant foam generally needs to increase 20% or more to reach the same strength density, which greatly increases the cost of the refrigerator.
Patent CN104672420 "A high-strength polyurethane rigid foam and preparation method and application thereof" discloses a technology that the compressive strength reaches 200KPa, and does not meet the requirement that the bearing design is more than or equal to 350 KPa.
CN 107033327B patent of highly compressive polyurethane composite material for ground of cold storage and preparation method thereof, adopts phthalic anhydride, aromatic dibasic acid polyol PS3152 and ethylenediamine polyol BH403 to match, effectively combines PIR structure and PUR structure, and utilizes highly symmetrical and high-content rigid benzene ring in the structure to achieve higher foam mechanical strength, in which case, the product density is 46.8kg/m3The highest compressive strength is 403KPa, the requirement of the load-bearing design is more than or equal to 350KPa is met, but the requirement of the distance more than or equal to 500KPa is far.
In the aspect of flame retardance, the large space, the high wall surface and the few safe exits are the building characteristics of a refrigeration house, and the large space causes the toxic gas of fire smoke to spread rapidly after a fire disaster occurs, so that the fire-resistant wall is very unfavorable for workers in dense smoke to escape. Meanwhile, the large span of the structure space of the refrigeration house determines that the collapse of the building can be caused once a fire disaster occurs, and the large-span structure needs corresponding building components for supporting, so that the selection of a steel structure and a prestressed concrete slab or a light component becomes a preferred object. And the fire-resistant collapse limit of the steel structure is only 8 minutes, so that the whole collapse of the building is easily caused.
Polyurethane foams are formed by reacting an isocyanate with a polyol component and are inherently flammable if a flame retardant is not added. For many years, significant fire related to polyurethane foams such as Jilin Baoyuan Feng, shou Guang, Beijing great-rise cold storage and the like is continuous, and GB50016-2014 'fire prevention code for building design' stipulates that the internal and external heat insulation systems of the building are not suitable for adopting B2-grade heat insulation materials, and strictly forbidden for adopting B3-grade heat insulation materials. The B1 grade flame-retardant rigid polyurethane foam material for walls requires that the oxygen index is more than or equal to 30 percent, so that a large amount of flame retardant is required to be added into the foam (the foam strength is reduced due to the plasticizing effect), and the strength of the rigid polyurethane foam material for B1 grade is much lower than that of rigid polyurethane foam materials for B3 and B2 grade due to the use of flame-retardant polyester or polyether polyol (the strength is reduced compared with that of conventional polyol).
Therefore, in the current stage, the ground of the refrigeration house in the construction of the refrigeration house needs to have low polyurethane density foam, B1 grade flame retardance and seamless connection realization, and the compressive strength of the polyurethane foam meets the design requirement (more than or equal to 500KPa) of the refrigeration house.
On the other hand, the pultrusion process has been used for decades to manufacture composite articles. The traditional resins used in the pultrusion process are polyester, unsaturated resins, phenolic resins, epoxy resins, and the like. The highly automated pultrusion technology can give full play to the mechanical properties of the fibers and is suitable for continuous production of resin matrix composite materials. The polyurethane is distinguished from the traditional resin by virtue of the advantages of excellent mechanical property, low-pressure forming, rapid curing, no styrene volatilization and the like, and becomes a new favorite in the resin matrix composite material industry. Pultrusion using polyurethane resins is a more recently developed technique. Particularly, under the current large trend of carbon peak reaching and carbon neutralization, the national building energy-saving standard is higher and higher, and the passive heat-preservation building is continuously emerged. More and more polyurethane pultruded profile doors and windows with the best heat-preservation and energy-saving effects are available later, and a large amount of pultruded polyurethane profile leftover materials with short sizes or the head and the tail of the profile are also generated.
Because the pultruded polyurethane section is formed by compounding about 80% of glass fiber with about 20% of polyurethane thermosetting resin, the pultruded polyurethane section cannot be recycled like thermoplastic plastics or metal materials, and can only be treated as solid waste at present, thereby wasting a large amount of social resources such as energy and the like. .
Therefore, in the present stage, a technical scheme capable of realizing the solid waste recycling of the pultrusion polyurethane profile leftover materials is significant for saving resources and protecting the environment.
Disclosure of Invention
The invention solves the technical requirements of the refrigeration house terrace on low density of the heat-insulating material, B1-grade flame retardance, seamless connection and compression strength of more than or equal to 500 KPa. Meanwhile, the invention utilizes the leftover materials which can only be subjected to waste solidification treatment before such as the polyurethane pultruded doors and windows or the pultruded square beams, realizes the reutilization of the leftover materials of the pultruded polyurethane section bars, and has great significance for saving resources and protecting the environment. Meanwhile, the method can save the maintenance time of the reinforced concrete of the terrace in the traditional construction method and save a large amount of time cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-compression-resistance high-flame-retardant spraying polyurethane hard foam terrace for a refrigeration house is characterized by comprising a keel frame formed by a plurality of keels, wherein each keel is formed by bonding a plurality of vertically arranged polyurethane pultrusion profile leftover materials, the height of each polyurethane pultrusion profile leftover material is matched with the designed thickness of a ground heat insulation layer of the refrigeration house, flame-retardant polyurethane hard foam is sprayed between every two adjacent keels, the spraying thickness of the flame-retardant polyurethane hard foam is equal to the height of the keel frame, and a prefabricated reinforced concrete plate is laid or reinforced concrete is directly poured after the upper part of the keel frame is leveled;
preferably, the keels are paved on the ground of the refrigeration house in a staggered or parallel manner;
preferably, the cavity of the leftover material of the polyurethane pultrusion profile is filled with flame-retardant rigid polyurethane foam;
preferably, a glue powder polyphenyl particle heat-preservation mortar layer is arranged between the flame-retardant polyurethane rigid foam and the prefabricated reinforced concrete slab, and the leveling between the sprayed flame-retardant polyurethane rigid foam and the keel frame is realized through the glue powder polyphenyl particle heat-preservation mortar layer;
preferably, reinforced concrete is integrally poured above the flame-retardant polyurethane rigid foam and the keel frame;
preferably, a pressure cement plate or an XPS plate is laid above the whole formed by the flame-retardant rigid polyurethane foam and the keel frame, and reinforced concrete is poured on the pressure cement plate or the XPS plate.
The construction process for spraying the polyurethane hard foam cold storage terrace with high compression resistance and better flame retardance is characterized by comprising the following steps of:
1) preparation of keel
Cutting the leftover materials of the polyurethane pultrusion profiles into lengths matched with the designed thickness of the ground heat-insulating layer of the refrigeration house, wherein each leftover material of the polyurethane pultrusion profiles is vertically arranged, and a plurality of leftover materials of the polyurethane pultrusion profiles are bonded to form a keel;
the leftover material of the polyurethane pultrusion profile is the leftover material of a polyurethane pultrusion door and window or a pultrusion square beam, and a cavity with a square or rectangular cross section is arranged inside the leftover material of the polyurethane pultrusion profile;
2) laying keel
Paving keels on the ground of the refrigeration house, wherein the distance between the keels is 300-600 mm;
3) spray flame retardant polyurethane rigid foam
Spraying flame-retardant polyurethane rigid foam between the keels to ensure that the gaps between the keels are completely filled with the flame-retardant polyurethane rigid foam, wherein the spraying thickness of the flame-retardant polyurethane rigid foam is equal to the height of the keel frame;
preferably, the cavity of the leftover material of the polyurethane pultrusion profile is filled with flame-retardant rigid polyurethane foam;
4) laying reinforced concrete slabs or pouring reinforced concrete
After glue powder polyphenyl particle thermal insulation mortar is used for leveling the height of the keel on the flame-retardant polyurethane rigid foam after spraying, a prefabricated reinforced concrete slab with the thickness of 100-300 mm is directly paved;
or a layer of pressure cement board or XPS board is laid on the flame-retardant polyurethane rigid foam after spraying for sharing pressure intensity to increase heat preservation performance, and then reinforced concrete is poured on the whole surface, wherein the pouring thickness of the reinforced concrete is 100-300 mm;
or the reinforced concrete with the thickness of 100-300 mm is directly poured on the sprayed flame-retardant polyurethane rigid foam.
The keel made by bonding the leftover materials of the polyurethane pultruded profile has the following manufacturing characteristics:
A. cutting the leftover solid wastes of hollow profiles with square cross sections, such as polyurethane pultrusion doors and windows or pultrusion square beams, into short profiles with the length designed for the ground insulating layer of the refrigeration house;
B. longitudinally arranging the cut sections, and gluing the sections into long keels by using a polyurethane structure and the like;
C. the hollow interior of the section is filled with polyurethane heat-insulating foam.
The high-compression-resistance and high-flame-retardant spraying polyurethane hard foam refrigeration house terrace and the construction process thereof have the following beneficial effects:
1. the invention utilizes the leftover materials which can only be subjected to waste solidification treatment before such as the polyurethane pultruded doors and windows or the pultruded square beams, realizes the reutilization of the leftover materials of the pultruded polyurethane section bars, and has great significance for saving resources and protecting the environment.
The polyurethane pultruded profile is currently applied to the fields of building doors and windows, electric wire tower poles, railway sleepers and the like, and particularly under the current large trend of carbon peak reaching and carbon neutralization, the national building energy-saving standard is higher and higher, and passive heat-insulating buildings are continuously emerged. More and more polyurethane pultruded profile doors and windows with the best heat-preservation and energy-saving effects are available later, and a large amount of pultruded polyurethane profile leftover materials with short sizes or the head and the tail of the profile are also generated.
Because the polyurethane pultrusion section is formed by compounding about 80% of glass fiber with about 20% of polyurethane thermosetting resin, the thermoplastic plastic or metal material cannot be recycled, and the polyurethane pultrusion section can only be treated as solid waste at present, thereby wasting a large amount of social resources such as energy and the like. Therefore, in the present stage, a technical scheme capable of realizing the solid waste recycling of the pultrusion polyurethane profile leftover materials is significant for saving resources and protecting the environment.
The leftover materials of the polyurethane pultrusion profiles also have all the excellent physical properties of the polyurethane pultrusion profiles, if the leftover materials can be reasonably utilized, the leftover materials are changed into valuable things, when the polyurethane composite material products produced by the pultrusion process are used as building materials, the product has the same service life as the building materials, the surface does not need to be treated, the product has stronger corrosion resistance to cement slurry and the like under alkaline or acidic environment (Zhangli, Chenqiuyu, Wudongyang and the like, research progress of one-way continuous fiber reinforced polyurethane composite material pultrusion (chemical propellant and high polymer material, vol.l 7 No. 3 of 2019), the polyurethane attached frame prepared by the pultrusion process is taken as an example, wherein the product has excellent mechanical properties without a supporting framework, the properties such as tensile strength, specific strength and the like are more than 10 times of those of PVC (polyvinyl chloride) plastic doors and windows, and the density is far greater than that of aluminum alloy and steel, and the density is only l/4 of the density of steel, 1/2 for aluminum alloy density. The compression strength (longitudinal) of a finished product of the polyurethane pultrusion profile produced by W650H, a product of Wanhua chemical (Beijing) Limited company is more than or equal to 860MPa, and the tensile strength of the finished product is more than or equal to 830 MPa. And its thermal conductivity is very low, about 0.3W/(m.K). (data source: passive ultra-low energy consumption green building used exterior door and window without thermal bridge design and construction, door and window, Zhou pei Jie 2016(11); 11-1).
The method comprises the steps of cutting leftover materials of polyurethane pultrusion sections with square or rectangular cross sections, such as polyurethane pultrusion doors and windows or pultrusion square beams, into short sections (generally 50-200 mm) with the length designed for the ground heat-insulating layer of the refrigeration house, vertically arranging the short sections, gluing the short sections into long-strip keels by using structures made of materials such as polyurethane, and filling polyurethane heat-insulating foam into the hollow sections. Because the leftover materials of the polyurethane pultrusion profiles are vertically arranged, the profile walls occupy small proportion of the whole sectional area, the heat preservation effect is good, and the heat conductivity coefficient of the keel is mainly determined by the flame-retardant polyurethane rigid foam filled inside.
2) Under the cost of the invention, the compressive strength of the system is very high, and the compressive strength is more than or equal to 500KPa, even more than or equal to 1000 KPa. The compression strength (longitudinal) of the finished product of the polyurethane pultruded profile is not less than 860MPa, only 5.8 ten-thousandth of the area of the keel of the polyurethane pultruded profile is needed, and if the area of the keel of the polyurethane pultruded profile is 5.81 thousandth of the area of the floor of the refrigeration house, the compression strength of the system can reach 1000 KPa. Under the condition that the prefabricated reinforced concrete slab with the thickness of 100-300 mm laid on the surface layer can meet the strength requirement, the compressive strength of the foam sprayed between the pultrusion profiles can be ignored, the foam density can be less than 35kg/m3, and a large amount of foam cost is saved.
3. According to the invention, after glue powder polyphenyl particle thermal insulation mortar is sprayed on the flame-retardant polyurethane rigid foam and the keel is leveled, the prefabricated reinforced concrete slab with the thickness of 100 plus 300mm is directly paved, so that the maintenance time of more than one week of the cast-in-place reinforced concrete terrace in the traditional construction method can be saved, and a large amount of time cost is saved.
In conclusion, the invention provides the high-pressure-resistance and high-flame-retardant spraying polyurethane hard foam refrigeration house terrace. The problem of freezer ground need urgently for a polyurethane density foam low, B1 level fire-retardant compressive strength reach freezer design requirement (more than or equal to 500KPa) and realize seamless connection in the freezer construction at present stage is solved. Simultaneously provides a technical scheme for realizing the reutilization of leftover materials of the polyurethane pultrusion profiles. The invention has high system compressive strength at low cost, and the system compressive strength can be easily more than or equal to 500KPa, even can reach 1000KPa or more. Under the condition that the prefabricated reinforced concrete slab with the thickness of 100-300 mm laid on the surface layer can meet the strength requirement, the foam density can be less than or equal to 35kg/m3And a large amount of foam cost is saved. According to the invention, after the glue powder mortar particles and the keels are used for leveling the height of the sprayed foam, the prefabricated reinforced concrete slab with the thickness of 100-300 mm can be directly paved, so that the maintenance time of the cast-in-place reinforced concrete terrace in the traditional construction method can be saved, and a large amount of time cost can be saved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The high resistance to compression high fire-retardant spraying polyurethane hard bubble freezer terrace of this embodiment has adopted special construction process, and its concrete construction step is as follows:
1) preparation of keel
The method comprises the steps of cutting leftover materials of polyurethane pultrusion profiles with square or rectangular cross sections, such as polyurethane pultrusion doors and windows, pultrusion square beams and the like, into short profiles with the length of 200mm, vertically arranging, gluing into long-strip keels with the length of 8m by using a polyurethane structure, and filling B1-grade flame-retardant rigid polyurethane foam into the hollow interiors of the profiles.
2) Laying keel
Keels are laid on the ground of the refrigeration house which is used as an insulating layer in parallel, and the distance between the keels is 400 mm.
3) Spray flame retardant polyurethane rigid foam
The composition wanefoam6013 of Wanhua energy-saving science and technology group Limited is used as the component A, the flame retardant grade of the composition is B1 grade, and the density of the composition is about 45kg/m3(ii) a Polymethylene polyphenyl polyisocyanate wanenanate PM200 from Vanhua chemical group GmbH is used as the B component. B1-grade flame-retardant polyurethane rigid foam is sprayed between the keels, so that gaps between the keels are completely filled with the flame-retardant polyurethane rigid foam, and the spraying thickness of the flame-retardant polyurethane rigid foam is 180 mm;
the B1-grade flame-retardant rigid polyurethane foam of the embodiment is composed of the component A and the component B, and the mass ratio of the component A to the component B is about 1: 1.1.
4) Lay reinforced concrete slab
And (3) leveling the sprayed flame-retardant polyurethane rigid foam by using glue powder polyphenyl particle thermal insulation mortar, and then directly paving a reinforced concrete slab with the thickness of 100mm above the flame-retardant polyurethane rigid foam.
The bearing compressive strength of the heat-insulating layer under the construction process is measured to reach 770KPa, and the heat conductivity coefficient is 0.02337 w/m.k (25 ℃).
Example 2
The high resistance to compression high fire-retardant spraying polyurethane hard bubble freezer terrace of this embodiment has adopted special construction process, and its concrete construction step is as follows:
1) preparation of keel
The hollow cross sections of polyurethane pultrusion door and window, pultrusion square beams and the like are square or rectangular polyurethane pultrusion profile leftover materials which are cut into short profiles with the length of 200mm, the short profiles are vertically arranged, then the long-strip keels with the length of 12m are adhered by using a polyurethane structure, and polyurethane heat-insulating foam is filled in the hollow interior of the profiles.
2) Laying keel
Keels are laid on the ground of the refrigeration house which is used as an insulating layer in parallel, and the distance between the keels is 400 mm.
3) Spray flame retardant polyurethane rigid foam
The composition wanefoam6012 of Wanhua energy-saving science and technology group Limited is used as the component A, the flame retardant grade of the composition is B2 grade, and the density of the composition is about 35kg/m3(ii) a Polymethylene polyphenyl polyisocyanate wanenanate PM200 from Vanhua chemical group GmbH is used as the B component. B2-grade flame-retardant polyurethane rigid foam is sprayed between the keels, so that gaps between the keels are completely filled with the flame-retardant polyurethane rigid foam, and the spraying thickness of the flame-retardant polyurethane rigid foam is 180 mm;
the mass ratio of the component A to the component B is 1: 1.1.
4) Lay reinforced concrete slab
And (3) leveling the sprayed flame-retardant polyurethane rigid foam by using glue powder polyphenyl particle thermal insulation mortar, and then directly paving a reinforced concrete slab with the thickness of 100mm above the flame-retardant polyurethane rigid foam.
The bearing compressive strength of the heat-insulating layer under the construction process is measured to reach 740KPa, and the heat conductivity coefficient is 0.02237 w/m.k (25 ℃).
Example 3
The embodiment adopts the refrigeration house ground construction process of directly spraying the B1-grade polyurethane heat-insulating material, and the concrete construction steps are as follows:
1) construction of heat-insulating layer
Using Wanhua energy-saving science and technology group LimitedThe composition wanefoam6013 is used as the component A, has a flame retardant grade of B1 and a density of about 45kg/m3(ii) a Polymethylene polyphenyl polyisocyanate wanenanate PM200 from Vanhua chemical group GmbH is used as the B component. Uniformly mixing the component A and the component B according to the weight ratio of 1:1.1, and spraying the mixture on the ground of a refrigeration house by a high-pressure spraying machine in a mixed manner, wherein the thickness of each layer is 20-30mm, and the spraying thickness of the heat-insulating layer is 200 mm.
2) Pouring concrete
And pouring 100mm of fine stone concrete on the sprayed flame-retardant polyurethane foam.
The bearing compressive strength of the heat-insulating layer under the construction process is measured to be 250KPa, and the heat conductivity coefficient is 0.02261 w/m.k (25 ℃).
Example 4
In this embodiment, a floor construction process of a refrigerator, in which polystyrene extruded sheets (XPS) are layered on top of each other, includes the following specific steps:
1) spread and paste polystyrene extruded sheet
Paving and pasting polystyrene extruded sheets with the density of about 45kg/m3(ii) a The upper layer and the lower layer of the extruded sheet are paved at seams, the same layer is paved at intervals, the extruded sheet is paved and finished, the seams of the sheet are extruded and compacted to reduce the seams as much as possible, and the paving thickness is 200 mm.
After the extruded sheet is laid, the wall surface, the post and the gap between the extruded sheet are filled by polyurethane foaming spraying, the polyurethane foaming spraying is sprayed until the outer surfaces of the wall surface, the post and the surface protection steel plate are flush, and the wall surface and the ground surface are connected and isolated by cold bridges to form a complete heat insulation system.
2) Pouring concrete
And pouring 100mm of fine stone concrete on the paved polystyrene extruded sheet.
The bearing compressive strength of the heat-insulating layer under the construction process is measured to be 320KPa, and the heat conductivity coefficient is 0.03526 w/m.k (25 ℃).
The construction process and the test indexes of the above embodiments 1 to 4 are summarized as follows:
from the above table data, it can be seen that the load-bearing compressive strength of the freezer terrace obtained by the present invention, especially the B1 grade foam, is more than twice of that of the two existing construction processes and materials thereof (example 3 directly spraying foam, example 4 paving polystyrene extruded sheet), and the thermal conductivity coefficient thereof is not much changed from that of the example 3 directly spraying foam, both of which meet the standard requirement of not more than 0.024 w/m.k (25 ℃), and both of which are far better than that of the example 4 paving polystyrene extruded sheet.
Finally, it should be noted that the above detailed description of the embodiments of the present invention patent, but the present invention patent is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are still within the scope of the invention.
Claims (7)
1. The utility model provides a hard bubble freezer terrace of high resistance to compression high fire-retardant spraying polyurethane which characterized in that includes the keel frame that comprises a plurality of fossil fragments, the fossil fragments are formed by the bonding of the polyurethane pultrusion section bar leftover bits of a plurality of vertical arrangements, the height and the freezer ground heat preservation design thickness phase-match of polyurethane pultrusion section bar leftover bits, the fire-retardant polyurethane rigid foam of spraying between the adjacent fossil fragments, fire-retardant polyurethane rigid foam spraying thickness equals the keel frame height, lay prefabricated reinforced concrete board or directly pour reinforced concrete after the keel frame top is floating.
2. The high-pressure-resistance high-flame-retardant spraying polyurethane hard foam cold storage terrace according to claim 1, wherein the keels are paved on the ground of the cold storage in a staggered or parallel manner.
3. The high-compression-resistance high-flame-retardant spraying polyurethane hard foam cold storage terrace according to claim 1, characterized in that the flame-retardant polyurethane hard foam is filled in the cavity of the polyurethane pultrusion profile leftover material.
4. The high-compression-resistance high-flame-retardance spraying polyurethane hard foam cold storage terrace according to claim 1, wherein a glue powder polyphenyl particle heat-preservation mortar layer is arranged between the flame-retardant polyurethane hard foam and the prefabricated reinforced concrete plate, and the leveling between the spraying flame-retardant polyurethane hard foam and the keel frame is realized through the glue powder polyphenyl particle heat-preservation mortar layer.
5. The high-compression-resistance high-flame-retardant spraying polyurethane hard foam cold storage terrace according to claim 1, characterized in that reinforced concrete is integrally poured above the flame-retardant polyurethane hard foam and the keel frame.
6. The high-compression-resistance high-flame-retardance spray polyurethane hard foam cold storage terrace according to claim 1, wherein a pressure cement plate or an XPS plate is laid above a whole formed by the flame-retardant polyurethane hard foam and the keel frame, and reinforced concrete is poured on the pressure cement plate or the XPS plate.
7. The construction process of the high-compression-resistance high-flame-retardant spraying polyurethane hard foam cold storage terrace according to any one of claims 1 to 6 is characterized by comprising the following steps:
1) preparation of keel
Cutting the leftover materials of the polyurethane pultrusion profiles into lengths matched with the designed thickness of the ground heat-insulating layer of the refrigeration house, wherein each leftover material of the polyurethane pultrusion profiles is vertically arranged, and a plurality of leftover materials of the polyurethane pultrusion profiles are bonded to form a keel;
the leftover material of the polyurethane pultrusion profile is the leftover material of a polyurethane pultrusion door and window or a pultrusion square beam, and a cavity with a square or rectangular cross section is arranged inside the leftover material of the polyurethane pultrusion profile;
2) laying keel
Paving keels on the ground of the refrigeration house, wherein the distance between the keels is 300-600 mm;
3) spray flame retardant polyurethane rigid foam
Spraying flame-retardant polyurethane rigid foam between the keels to ensure that the gaps between the keels are completely filled with the flame-retardant polyurethane rigid foam, wherein the spraying thickness of the flame-retardant polyurethane rigid foam is equal to the height of the keel frame;
preferably, the cavity of the leftover material of the polyurethane pultrusion profile is filled with flame-retardant rigid polyurethane foam;
4) laying reinforced concrete slabs or pouring reinforced concrete
After glue powder polyphenyl particle thermal insulation mortar is used for leveling the height of the keel on the flame-retardant polyurethane rigid foam after spraying, a prefabricated reinforced concrete slab with the thickness of 100-300 mm is directly paved;
or a layer of pressure cement board or XPS board is laid on the flame-retardant polyurethane rigid foam after spraying for sharing pressure intensity to increase heat preservation performance, and then reinforced concrete is poured on the whole surface, wherein the pouring thickness of the reinforced concrete is 100-300 mm;
or the reinforced concrete with the thickness of 100-300 mm is directly poured on the sprayed flame-retardant polyurethane rigid foam.
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