CN115491949A - 3D air track system based on foaming prefabricated elastic layer and construction method - Google Patents

3D air track system based on foaming prefabricated elastic layer and construction method Download PDF

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Publication number
CN115491949A
CN115491949A CN202211296979.2A CN202211296979A CN115491949A CN 115491949 A CN115491949 A CN 115491949A CN 202211296979 A CN202211296979 A CN 202211296979A CN 115491949 A CN115491949 A CN 115491949A
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layer
prefabricated
elastic layer
self
system based
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倪广真
周夏辉
林凡秋
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Dubacheng Sports Facilities Shanghai Co ltd
Dbc New Material Technology Shanghai Co ltd
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Dubacheng Sports Facilities Shanghai Co ltd
Dbc New Material Technology Shanghai Co ltd
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions 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
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/02—Foundations, e.g. with drainage or heating arrangements

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Road Paving Structures (AREA)

Abstract

A3D air track system based on a foaming prefabricated elastic layer and a construction method thereof comprise a base layer, wherein the base layer is formed by paving asphalt concrete, a bottom-coating adhesive layer is arranged on the base layer, a prefabricated elastic layer is arranged on the bottom-coating adhesive layer, a self-leveling reinforcing layer is arranged on the prefabricated elastic layer, finally, an anti-slip surface layer is arranged on the self-leveling reinforcing layer, a Thermoplastic Polyurethane (TPU) membrane is rolled and foamed by the prefabricated elastic layer through a calendering and foaming process after being subjected to hot melting, an integral structure is formed, the structure is filled with closed tiny air bags, and the foamed TPU is formed by mould pressing, cooling and shaping and then is rolled to form the required prefabricated elastic layer. The invention solves the problems of easy cracking, poor impact absorption performance, short service life and the like of the traditional prefabricated type; the shock absorption and buffering performance is excellent, even in winter, the shock absorption performance is still excellent, the construction efficiency is improved, meanwhile, the environment is protected, the service life is long, and the comprehensive performance cost ratio is high.

Description

3D air track system based on foaming prefabricated elastic layer and construction method
Technical Field
The invention relates to the field of on-site manufactured pavement and simulated ground materials, in particular to a 3D air track system based on a foamed prefabricated elastic layer and a matched construction method.
Background
At present, plastic runways are frequently used as indispensable important facilities in sports places such as playgrounds of various schools, fitness footpaths of citizens, track and field sports areas of stadiums and the like in China, compared with the traditional soil runways, the plastic runways have good elasticity, skid resistance, wear resistance and shock absorption, so that athletes are not easy to be injured when running sports are carried out on the plastic runways, and the plastic runways are made of materials with bright colors and are attractive and tidy integrally, so that the plastic runways are rapidly adopted by the track and field sports fields after coming out.
The prior art is that the old traditional prefabricated rubber track is usually manufactured into a structure with the thickness of 13mm, the width of 1.22m and the length of a coil of 15m before leaving a factory, and is directly spliced on site, and a gap at the spliced part is covered by drawing a white line. The traditional prefabricated rubber track is formed by extruding and molding rubber raw materials after vulcanization, is easily influenced by temperature, has serious phenomena of expansion caused by heat and contraction caused by cold, and is very easy to cause cracking and edge warping at a joint. In addition, the prefabricated rubber track produced by the traditional vulcanization process is generally harder, particularly after the prefabricated rubber track is used, the prefabricated rubber track is harder and harder due to poor aging performance, the impact absorption capacity is poorer and harder, and after the prefabricated rubber track is basically used for 2 to 3 years, the physical properties can not meet the requirements of the new national standard GB 36246-2018.
In addition, the foamed polyurethane material stored in the site construction is easily affected by humidity in the air, so that the solidification and foaming are not uniform, the thickness during solidification is not uniform, the elasticity is not uniform, and water accumulation in local areas is easily caused. The final product has poor comfort due to uneven thickness, and the foamed cushion layer has very poor tensile strength and elongation at break.
In addition, the polyurethane plastic track is basically leveled by a paver or is self-leveled by liquid during construction, and the next procedure is constructed after solidification, particularly aiming at the problems that the existing micro-foaming full-plastic or mixed track which is widely applied is not good in bonding strength between layers, and easily causes delamination phenomenon, so that the track is not enough in durability, poor in physical performance, not suitable for large-area use of the track, and not suitable for a professional stadium or a plastic track with competition requirements.
In summary, in the prefabricated rubber track and the traditional polyurethane track in the prior art, under the condition that the impact absorption is required to be detected at 0 ℃ by a new national standard, the prefabricated rubber track and the traditional polyurethane track respectively have the problems of poor aging performance, generally hardness, increasingly poor impact absorption capability along with the lapse of time, poor bonding strength, easy delamination, insufficient durability of the track and poor physical performance, so that the track materials produced by many domestic manufacturers are difficult to meet the corresponding national standard detection requirements.
Disclosure of Invention
In order to solve the problems of the prefabricated rubber track and the traditional polyurethane track in the prior art, the invention provides a 3D air track system based on a foaming prefabricated elastic layer and a construction method thereof by knowing the advantages and the disadvantages of the prefabricated rubber track and the traditional polyurethane plastic track in the prior art.
The invention relates to a 3D air track system based on a foaming prefabricated elastic layer and a construction method, wherein the specific structure and construction steps are as follows:
the utility model provides a 3D air course system based on prefabricated elastic layer of foaming, includes the foundation bed, its characterized in that:
the base layer is laid by asphalt concrete, a bottom-coating adhesive layer is arranged on the base layer, a prefabricated elastic layer is arranged on the bottom-coating adhesive layer, a self-leveling reinforcing layer is arranged on the prefabricated elastic layer, and finally, an anti-skid surface layer is arranged on the self-leveling reinforcing layer, namely, the structures of the base layer, the bottom-coating adhesive layer, the prefabricated elastic layer, the self-leveling reinforcing layer and the anti-skid surface layer are formed from bottom to top and are connected into a whole in a bonding mode;
the bottom coating adhesive layer is formed by coating, rolling or spraying polyurethane adhesive on the base layer, the thickness of the bottom coating adhesive layer is 0.1-1 mm, and the dosage of the adhesive per square meter is 0.11-1.1 kg;
the prefabricated elastic layer is a prefabricated part, and the size of the prefabricated elastic layer is 0.5-3 m in width, 6-30 m in length and 3-30 mm in thickness;
the self-leveling reinforcing layer is formed by self-leveling after blade coating of two-component polyurethane, the thickness of the self-leveling reinforcing layer is 2-10 mm, and the dosage of the polyurethane per square meter is 2.4-12 kg;
self-leveling is a construction leveling process, and the construction method is that self-leveling materials are blended into liquid substances with certain fluidity, the liquid substances are freely diffused by means of gravity to form a horizontal plane, and the horizontal plane is naturally coagulated and formed.
The thickness of the antiskid surface layer is 2-10 mm.
The 3D air track system based on the foaming prefabricated elastic layer is characterized in that the prefabricated elastic layer specifically comprises the following components in percentage by weight: thermoplastic Polyurethane (TPU) membranes with the thickness of 1-10 mm are subjected to a calendering foaming process, and are foamed after being subjected to hot melting to form an integral structure, the structure is filled with closed micro air bags, and the foamed TPU is molded, cooled and shaped and then rolled to form the required prefabricated elastic layer.
The design point of the invention is that the micro-airbag structure is used as a prefabricated elastic layer, so that the micro-airbag structure is defined as a 3D air track system.
The 3D air track system based on the foaming prefabricated elastic layer is characterized in that the thermoplastic polyurethane membrane used by the prefabricated elastic layer is made of one or more of thermoplastic polyurethane, polyolefin, polystyrene, styrene, polyvinyl chloride and high-density polyethylene.
The 3D air track system based on the foaming prefabricated elastic layer is characterized in that the thickness of the prefabricated elastic layer is controlled to be 3-50 mm during hot melting and extrusion, the impact absorption of the formed prefabricated elastic layer is 10-80%, the tensile strength of the prefabricated elastic layer is 0.1-2 MPa, and the elongation at break is 10-300%.
The 3D air track system based on the foamed prefabricated elastic layer is characterized in that the hot melting temperature of the prefabricated elastic layer during calendaring and foaming is as follows: at 160-240 ℃, the closed-pore micro-air sac formed after calendering and foaming is circular or elliptical, the diameter is 0.01-3 mm, and the bulk density is 15-200 kg/m 3 。
The preformed elastic layer may also be formed by calendering and foaming thermoplastic polyurethane particles.
The 3D air track system based on the foaming prefabricated elastic layer is characterized in that double-component polyurethane of the self-leveling reinforcing layer is formed by uniformly mixing and stirring double-component elastomer glue according to the proportion of 100 parts of component A and 87 parts of component B and then blade-coating the mixture on the prefabricated elastic layer, wherein the thickness of the self-leveling reinforcing layer is 2-10 mm, and the using amount of the double-component elastomer glue is 2.4-12 kg.
The two-component elastomer glue is low in viscosity and good in leveling property.
The 3D air track system based on the foamed prefabricated elastic layer is characterized in that the antiskid surface layer is made of single/double-component polyurethane glue mixed ethylene propylene diene monomer rubber particles and ethylene propylene diene monomer rubber particle powder, is formed by on-site paving, pouring or spraying, and is bonded with the prefabricated elastic layer after being solidified to form the surface of a plastic track.
The 3D air track system based on the foamed prefabricated elastic layer is characterized in that the ethylene propylene diene monomer particles adopted in the anti-skid surface layer have the particle size of 0.1-4 mm and are irregular cuts.
A construction method of a 3D air track system based on a foaming prefabricated elastic layer is based on the 3D air track system based on the foaming prefabricated elastic layer, and comprises the following specific steps:
1) First, the base layer is processed:
the asphalt concrete used as the base layer is hard, dry and capable of bearing, has no loose particles, oil, grease, paint or other substances which obstruct adhesion, and the uneven part needs to be polished;
2) Setting a bottom coating adhesive layer:
cleaning the area of a foundation layer to be constructed by using a blower before construction to ensure that the ground is dry and free of impurities, and then scraping, spraying or rolling polyurethane adhesive on the foundation layer, wherein the range of the paved surface requires that all the polyurethane adhesive is sprayed in place without leaving a leakage area, so that a bottom coating adhesive layer adhered with the foundation layer is formed, the using amount of the polyurethane adhesive per square meter in the step is 0.11-1.1 kg, and the thickness of the bottom coating is 0.1-1 mm;
3) Setting a prefabricated elastic layer:
spreading each prefabricated buffer layer roll within 30 minutes after the polyurethane adhesive used for the bottom-coating adhesive layer is blade-coated, laying the prefabricated buffer layers on the bottom-coating adhesive layer in an extrusion mode, closely connecting each prefabricated buffer layer roll to reduce gaps, rolling the prefabricated buffer layers in the same direction by using a roller after the laying is finished, completely attaching the prefabricated buffer layers to the upper part of the bottom-coating adhesive layer, flatly pressing the prefabricated buffer layers on the peripheral edges of the prefabricated buffer layers by using fixed bricks until the bottom-coating adhesive of the bottom-coating adhesive layer for bonding with the prefabricated buffer layers is completely solidified;
4) In the step 3), before the bottom coating adhesive layer is not solidified, the prefabricated buffer layer is prevented from moving on the laid prefabricated buffer layer, the phenomenon that the prefabricated buffer layer is disturbed to cause overlarge abutted seams or local bulge of the buffer layer is prevented, and the brick is preferably selected according to the selection standard of high specific gravity, flat bottom surface, no cracking and no dust falling.
5) Setting a self-leveling reinforcing layer:
the self-leveling reinforcing layer is formed by uniformly mixing and stirring 100 parts of component A and 87 parts of component B and then blade-coating the mixture on a prefabricated elastic layer to form the self-leveling reinforcing layer, wherein 2.4-12 kilograms of two-component elastomer polyurethane glue is used per square meter, and the thickness of the self-leveling reinforcing layer is 2-10 mm.
6) Setting an anti-slip surface layer:
the anti-skid surface layer is formed by uniformly mixing and stirring another two-component elastomer polyurethane glue according to the weight ratio of 2;
7) Standing for 8-12 hours after the step 5) is finished, drawing a runway line after the liquid material is completely cured, and then naturally curing for 3-5 days to be used formally.
The construction method of the 3D air track system based on the foaming prefabricated elastic layer is characterized in that an anti-skidding surface layer is arranged in the step 6), and ethylene propylene diene monomer particles with the particle size of 0.5-3 mm, ethylene propylene diene monomer particle powder with the particle size of 0.1-0.5 mm, single-component polyurethane glue and color paste can be further prepared, wherein the 4 materials are prepared according to the weight ratio of 14:1:10:5, uniformly mixing and stirring, and spraying the mixture on the upper part of the self-leveling reinforcing layer by using a spraying machine, wherein the spraying process needs to be carried out for 1 time in the forward direction and the reverse direction respectively, 1.4 kg of ethylene propylene diene monomer particles, 0.1 kg of ethylene propylene diene monomer particles, 1 kg of single-component polyurethane glue and 0.5 kg of color paste are used per square meter in the step, and the thickness of the anti-skid surface layer is 3mm.
The 3D air track system based on the foamed prefabricated elastic layer and the construction method have the following beneficial effects:
1. according to the 3D air track system based on the foamed prefabricated elastic layer and the construction method, the elastic layer is prefabricated in a factory and the process of constructing the self-leveling reinforcing layer on site is combined, so that the problems of easiness in cracking, poor impact absorption performance, short service life and the like of the traditional prefabricated type are effectively solved;
2. according to the 3D air track system based on the foaming prefabricated elastic layer and the construction method, a large number of closed micro air bags are arranged in the prefabricated elastic layer, excellent shock absorption and buffering performance can be provided, impact on feet in the exercise process can be effectively absorbed, good prefabrication performance is provided for the feet, a large amount of energy can be fed back by the high resilience effect of materials, exercise energy consumption is reduced, and even in winter, the impact absorption performance is still excellent;
3. according to the 3D air track system based on the foamed prefabricated elastic layer and the construction method, due to the application of the self-leveling reinforcing layer, gaps among rolls left when the prefabricated elastic layer is laid are completely covered, an integral seamless plastic track is formed, the fact that the whole track system has excellent tensile strength and elongation at break is guaranteed, the construction efficiency is improved, and meanwhile the whole system is more environment-friendly, better in elasticity, better in motion performance, long in service life and higher in comprehensive cost performance.
Drawings
Fig. 1 is a specific structural schematic diagram of a 3D air track system based on a foamed prefabricated elastic layer and a construction method of the invention.
In the figure: 1-a base layer, 2-a bottom coating adhesive layer, 3-a prefabricated elastic layer, 4-a self-leveling reinforcing layer and 5-an anti-slip surface layer.
Detailed Description
The technical means, creation features, achievement purposes and effects of the 3D air track system based on the foamed prefabricated elastic layer and the construction method of the invention are further described below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, a 3D air track system based on a foamed prefabricated elastic layer comprises a base layer 1, wherein the base layer is formed by paving asphalt concrete, a bottom-coating adhesive layer 2 is arranged on the base layer, a prefabricated elastic layer 3 is arranged on the bottom-coating adhesive layer, a self-leveling reinforcing layer 4 is arranged on the prefabricated elastic layer, and finally an anti-skid surface layer 5 is arranged on the self-leveling reinforcing layer 4, namely, the structures of the base layer, the bottom-coating adhesive layer, the prefabricated elastic layer, the self-leveling reinforcing layer and the anti-skid surface layer are formed from bottom to top and are connected into a whole in an adhesive mode;
the bottom coating adhesive layer 2 is formed by coating, rolling or spraying polyurethane adhesive on the base layer 1, the thickness of the bottom coating adhesive layer is 0.1-1 mm, and the dosage of each square meter of the adhesive is 0.11-1.1 kg;
the prefabricated elastic layer 3 is a prefabricated part with the size of 0.5-3 meters in width, 6-30 meters in length and 3-30 mm in thickness;
the self-leveling reinforcing layer 4 is formed by self-leveling after blade coating of two-component polyurethane, the thickness of the self-leveling reinforcing layer is 2-10 mm, and the dosage of the polyurethane per square meter is 2.4-12 kg;
the thickness of the antiskid surface layer 5 is 2-10 mm.
The preformed elastic layer 3 is specifically: thermoplastic Polyurethane (TPU) membranes with the thickness of 1-10 mm are subjected to calendering foaming process, and are foamed after being subjected to hot melting to form an integral structure, the structure is filled with small air bags which are sealed one by one, and the foamed TPU is molded, cooled and shaped and then rolled to form the required prefabricated elastic layer.
The thermoplastic polyurethane membrane used for the prefabricated elastic layer 3 is made of one or more of thermoplastic polyurethane, polyolefin, polystyrene, styrene, polyvinyl chloride and high-density polyethylene.
The thickness of the preformed elastic layer 3 is controlled to be 3-50 mm during hot melting and extrusion, the impact absorption of the formed preformed elastic layer is 10-80%, the tensile strength of the preformed elastic layer is 0.1-2 MPa, and the elongation at break is 10-300%.
The hot melting temperature when the preformed elastic layer 3 is rolled and foamed is as follows: the closed-pore micro-air sac formed after calendaring and foaming is round or oval at 160-240 ℃, the diameter is 0.01-3 mm, and the bulk density is 15-200 kg/m 3 。
In addition, the preformed elastic layer 3 may also be formed by replacing the thermoplastic polyurethane film with thermoplastic polyurethane particles.
The two-component polyurethane of the self-leveling reinforcing layer 4 is formed by uniformly mixing and stirring two-component elastomer glue according to the proportion of 100 parts of the component A and 87 parts of the component B and then blade-coating the mixture on the prefabricated elastic layer 3 to form the self-leveling reinforcing layer, wherein the thickness of the self-leveling reinforcing layer is 2-10 mm, and the dosage of the two-component elastomer glue is 2.4-12 kg.
The antiskid surface layer 5 is made of single/double-component polyurethane glue mixed ethylene propylene diene monomer particles and ethylene propylene diene monomer particle powder, is formed by on-site paving, pouring or spraying, and is bonded with the prefabricated elastic layer 4 after being solidified to form the surface of the plastic track.
The ethylene propylene diene monomer particles adopted in the anti-skid surface layer 5 have the particle size of 0.1-4 mm and are irregular cutting bodies.
A construction method of a 3D air track system based on a foaming prefabricated elastic layer is based on the 3D air track system based on the foaming prefabricated elastic layer, and comprises the following specific steps:
1) First, the base layer 1 is processed:
the asphalt concrete used as the base layer is hard, dry and capable of bearing, has no loose particles, oil, grease, paint or other substances which obstruct adhesion, and the uneven part needs to be polished;
2) Setting a bottom coating adhesive layer 2:
cleaning the area of a foundation layer to be constructed by using a blower before construction to ensure that the ground is dry and free of impurities, then scraping, spraying or rolling polyurethane adhesive on the foundation layer 1, wherein the range of a laying surface requires that all the polyurethane adhesive is sprayed in place without leaving a leakage area, and forming a bottom coating adhesive layer 2 adhered with the foundation layer, wherein the usage amount of the polyurethane adhesive per square meter in the step is 0.11-1.1 kg, and the thickness of the bottom coating is 0.1-1 mm;
3) Setting the preformed elastic layer 3:
within 30 minutes after the polyurethane adhesive used for the bottom-coating adhesive layer 2 is blade-coated, each prefabricated buffer layer roll is unfolded and is laid on the bottom-coating adhesive layer in an extrusion mode, each prefabricated buffer layer roll is tightly connected with each other to reduce gaps, and after the laying is finished, the prefabricated buffer layers are rolled in the same direction by a roller, so that the prefabricated buffer layers are completely attached to the upper part of the bottom-coating adhesive layer, and then fixed bricks are flatly pressed on the peripheral edges of the prefabricated buffer layers until the bottom-coating adhesive of the bottom-coating adhesive layer for bonding with the prefabricated buffer layers is completely solidified;
4) In the step 3), before the bottom coating adhesive layer 2 is not solidified, the prefabricated buffer layer 3 which is laid is prevented from moving, the phenomenon that the prefabricated buffer layer is disturbed to cause overlarge abutted seams or local bulge of the buffer layer is prevented, and in addition, the brick block is preferably selected according to the selection standard of high specific gravity, flat bottom surface, no cracking and no dust falling.
5) Setting a self-leveling reinforcing layer 4:
the self-leveling reinforcing layer is formed by uniformly mixing and stirring 100 parts of a component A and 87 parts of a component B according to a ratio of the component A to the component B, and then blade-coating the mixture on the prefabricated elastic layer 3, wherein in the step, 2.4-12 kg of two-component elastomer polyurethane glue is used per square meter, and the thickness of the self-leveling reinforcing layer is 2-10 mm.
6) Setting an anti-slip surface layer 5:
the anti-skid surface layer is formed by uniformly mixing and stirring another two-component elastomer polyurethane glue according to the weight ratio of 2;
7) Standing for 8-12 hours after the step 5) is finished, drawing a runway line after the liquid material is completely cured, and then naturally curing for 3-5 days to be formally opened for use.
The anti-skid surface layer 5 is arranged in the step 6), ethylene propylene diene monomer particles with the particle size of 0.5-3 mm, ethylene propylene diene monomer particle powder with the particle size of 0.1-0.5 mm, single-component polyurethane glue and color paste can also be added, and the 4 materials are mixed according to the weight ratio of 14:1:10:5, uniformly mixing and stirring, and spraying the mixture on the upper part of the self-leveling reinforcing layer 4 by using a spraying machine, wherein the spraying process needs to be carried out for 1 time in the forward direction and the reverse direction respectively, 1.4 kg of ethylene propylene diene monomer particles, 0.1 kg of ethylene propylene diene monomer particles, 1 kg of polyurethane glue and 0.5 kg of color paste are used per square meter in the step, and the thickness of the anti-skid surface layer is 3mm.
Example 1-foamed prefabricated elastic layer based 3D air track system and construction method with thickness of 13 mm:
the foundation layer 1 is an asphalt concrete foundation layer.
The primer adhesive layer 2 is used as an adhesive layer between the base layer 1 and the preformed elastic layer 3, and specifically, the primer adhesive layer is formed by coating a two-component polyurethane adhesive on the upper surface of the base layer in a blade manner, in this embodiment 1, the dosage per square meter of the primer adhesive layer is 0.66 kg, and the thickness of the primer adhesive layer is 0.6mm.
In this example 1, the preformed elastic layer 3 has a specific dimension of 1.5 meters in width, 20 meters in length per roll and 8mm in thickness.
The self-leveling reinforcing layer 4 is formed by mixing 100 parts of component A and 87 parts of component B with two-component elastomer glue with low viscosity and good leveling property, uniformly stirring and then blade-coating the mixture on the prefabricated elastic layer to form the self-leveling reinforcing layer, 2.4 parts of two-component elastomer polyurethane glue is used in the embodiment 1, the thickness of the self-leveling reinforcing layer is 2mm, and the gap left when the prefabricated elastic layer 3 is laid by the self-leveling reinforcing layer is completely covered to form a seamless structure.
The antiskid surface layer 5 is composed of ethylene propylene diene monomer particles with the particle size of 0.5-3 mm, ethylene propylene diene monomer particle powder with the particle size of 0.1-0.5 mm, single-component polyurethane glue and color paste, wherein the 4 materials are prepared according to the weight ratio of 14:1:10:5, uniformly mixing and stirring, and spraying the mixture on the upper part of the self-leveling reinforcing layer by using a spraying machine, wherein the spraying process needs to be carried out for 1 time in the forward direction and the reverse direction respectively, 1.4 kg of ethylene propylene diene monomer particles, 0.1 kg of ethylene propylene diene monomer particles, 1 kg of single-component polyurethane glue and 0.5 kg of color paste are used per square meter in the step, and the thickness of the anti-skid surface layer is 3mm.
Note that this example 1 has reached a thickness of 13mm (0.6 mm for the primer adhesive layer + 8mm for the preformed elastic layer + 2mm for the self-leveling reinforcing layer + 3mm for the slip-resistant face layer) =13.6mm at this time), completing the predetermined requirements.
The construction procedure of example 1 is as follows:
1) Firstly, processing a base layer:
the base layer adopting the asphalt must be hard, dry and bearable, has no loose particles, oil, grease, paint or other substances which obstruct adhesion, and the flatness and the gradient of the asphalt base layer must meet the requirements of relevant site construction technical specifications and design;
2) Setting a bottom coating adhesive layer:
cleaning the area of a foundation layer to be constructed by using a blower before construction to ensure that the ground is dry and free of impurities, coating the upper surface of the foundation layer 1 with a double-component polyurethane adhesive in a scraping manner, wherein the range of the laying surface is required to be completely sprayed in place, and a missing area cannot be formed, and finally forming a bottom coating adhesive layer adhered with the foundation layer;
3) In the step 2), the dosage of the adhesive is 0.66 kg/per square meter, and the thickness of the adhesive layer of the base coat is 0.6mm;
4) Setting a prefabricated elastic layer:
spreading each prefabricated roll of elastic layer within 30 minutes after the adhesive used for the bottom coating adhesive layer is scraped, and laying the elastic layer on the bottom coating adhesive layer in an extrusion mode, wherein each roll of the prefabricated elastic layer is tightly connected to reduce gaps, and rolling the elastic layer in the same direction by using a roller with the weight of 50 kilograms after laying is finished, so that the prefabricated elastic layer is completely attached to the bottom coating adhesive layer, and then flatly pressing the periphery of the prefabricated elastic layer by using fixed bricks until the bottom coating adhesive of the bottom coating adhesive layer for bonding with the prefabricated elastic layer is completely solidified;
5) In the step 4), before the bottom coating adhesive layer is not solidified, the paved coiled material is prevented from moving, the phenomenon that the abutted seam is too large or the local hollowing is caused due to the disturbance of the coiled material is avoided, and the selection standard of the fixed brick is to select the brick with high specific gravity, flat bottom surface, no cracking and no dust falling;
6) Setting a self-leveling reinforcing layer:
the two-component elastomer glue is mixed according to the weight ratio of 100 to 87, the mixture is uniformly stirred and then coated on the prefabricated elastic layer, and a self-leveling reinforcing layer is formed after curing, in the embodiment 1, the two-component elastomer polyurethane glue is used for 2.4, and the thickness of the self-leveling reinforcing layer is 2mm.
7) Setting an anti-slip surface layer:
mixing ethylene propylene diene monomer particles with the particle size of 0.5-3 mm, ethylene propylene diene monomer particle powder with the particle size of 0.1-0.5 mm, single-component polyurethane glue and color paste according to the weight ratio of 14:1:10:5, uniformly mixing and stirring, and spraying the mixture on the upper part of the self-leveling reinforcing layer obtained in the step 6) by using a spraying machine, wherein the spraying needs to be carried out for 1 time in the forward direction and the reverse direction respectively;
in the embodiment 1, in addition to the contents disclosed in the above specific embodiments, 1.4 kg of epdm particles, 0.1 kg of epdm powder, 1 kg of one-component polyurethane glue and 0.5 kg of color paste are used per square meter during construction, and the thickness of the finished antislip surface layer is 3mm;
in this embodiment 1, after the construction sequence is completed, the construction sequence needs to be left for 8 to 12 hours, and after the surface material is completely cured, a runway line is drawn, and then the construction sequence is naturally cured for 3 to 5 days, and then the construction sequence can be formally opened for use.
The physical properties of the 3D air track system based on a foamed prefabricated elastic layer and the construction method of the embodiment 1, which are 13mm thick, compared with those of the prefabricated track of the national standard and the prior art are shown in the following tables 1 and 2:
Figure BDA0003903119840000091
table 1: the physical properties required by the common permeable plastic runway product and the new national standard GB36246-2018 are compared with those required by the embodiment 1.
Physical and mechanical performance index project New national standard index This example Common prefabricated comparative example
Tensile Strength/(MPa) ≥0.5 1.53 0.6
Elongation at Break/(%) ≥40 201 51
Table 2: in this example 1, the tensile strength and elongation at break after 500 hours of aging resistance required by the common prefabricated plastic track product and the new national standard GB36246-2018 are compared.
Example 2-another 3D air track system and construction method based on foamed preformed elastic layer with thickness of 13 mm:
the present example 2 is the same as the example 1 except that the non-slip surface layer is different:
the main points of the antiskid surface layer of this embodiment 2 lie in:
the two-component elastomer polyurethane glue is uniformly mixed and stirred according to the weight ratio of 2, and then is coated on the upper part of a self-leveling reinforcing layer in a scraping manner, ethylene-propylene-diene monomer particles (with the particle size of 0.1-4 mm) are thrown on the liquid surface of an elastomer, and after solidification, redundant ethylene-propylene-diene monomer particles are cleaned up to form an anti-slip surface layer, wherein the weight ratio of each square meter used in the step is 2.5 kg for the two-component elastomer polyurethane glue of 1, the weight ratio of the ethylene-propylene-diene monomer particles is 2.8 kg, and the thickness of the anti-slip surface layer is 3mm.
Note that, in this embodiment 2, the thickness has reached 13mm, and the predetermined requirement is completed.
In this embodiment 2, after the construction sequence is completed, the construction process needs to be performed for 8 to 12 hours, and after the anti-slip surface layer material is completely cured, a runway line is drawn, and then the construction process is naturally cured for 3 to 5 days, and then the construction process can be formally opened for use.
The physical properties of this example 2 are compared in the following tables 3 and 4:
Figure BDA0003903119840000101
table 3: the physical properties required by the embodiment 2 are compared with those required by common permeable plastic track products and a new national standard GB 36246-2018.
Physical mechanical performance index items New national standard index This example Common prefabricated comparative example
Tensile Strength/(MPa) ≥0.5 1.5 0.6
Elongation at Break/(%) ≥40 205 51
Table 4: in this example 2, the tensile strength and elongation at break after 500 hours of aging resistance required by the common prefabricated plastic track product and the new national standard GB36246-2018 are compared.
Example 3-foamed prefabricated elastic layer based 3D air track system and construction method with thickness of 20 mm:
the foundation layer 1 is an asphalt concrete foundation layer.
The primer adhesive layer 2 is used as an adhesive layer between the base layer and the preformed elastic layer, and specifically, the primer adhesive layer is formed by coating a two-component polyurethane adhesive on the upper surface of the base layer in a blade manner, in this embodiment 3, the usage amount of the primer adhesive layer per square meter is 0.22 kg, and the thickness of the primer adhesive layer is 0.2mm.
In this example 3, the preformed elastic layer 3 has a specific size of 2 meters in width, 15 meters in length per roll and 15mm in thickness.
The self-leveling reinforcing layer 4 is formed by mixing 100 parts of component A and 87 parts of component B with two-component elastomer glue with low viscosity and good leveling property according to the weight ratio, uniformly stirring and then blade-coating the mixture on a prefabricated elastic layer to form the self-leveling reinforcing layer, 2.4 parts of two-component elastomer polyurethane glue is used in the embodiment 1, and the thickness of the self-leveling reinforcing layer is 2mm.
The thickness of self-leveling reinforcing layer 4 is 2mm, and this self-leveling reinforcing layer covers the gap that leaves when laying prefabricated elastic layer 3 completely, forms seamless structure.
The anti-skid surface layer 5 is formed by uniformly mixing and stirring another two-component elastomer polyurethane glue according to the weight ratio of 2.
It should be noted that in this example 1, the thickness has reached 20mm (0.2 mm of the primer adhesive layer + 15mm of the preformed elastic layer + 2mm of the self-leveling reinforcing layer + 3mm of the anti-slip surface layer), and the predetermined requirements are met.
The construction procedure of this example 3 is as follows:
1) Firstly, processing a base layer:
the base layer adopting the asphalt must be hard, dry and bearing, has no loose particles, oil, grease, paint or other substances which obstruct adhesion, and the flatness and the gradient of the asphalt base layer must meet the requirements of relevant site construction technical specifications and design;
2) Setting a bottom coating adhesive layer:
cleaning the area of a foundation layer to be constructed by using a blower before construction to ensure that the ground is dry and free of impurities, coating the upper surface of the foundation layer with a double-component polyurethane adhesive in a scraping manner, wherein the range of the laying surface is required to be completely sprayed in place, and a missing area cannot be formed, and finally forming a bottom coating adhesive layer adhered with the foundation layer;
3) In the step 2), the using amount of the adhesive is 0.22 kg/per square meter, and the thickness of the base coat adhesive layer is 0.2mm;
4) Setting a prefabricated elastic layer:
within 30 minutes after the adhesive used for the bottom-coat adhesive layer is coated in a scraping manner, each roll of prefabricated elastic layer is unfolded and laid on the bottom-coat adhesive layer in an extrusion manner, each roll of prefabricated elastic layer is tightly connected with each other to reduce gaps, and after the laying is finished, a roller with the weight of 50 kilograms is used for rolling in the same direction, so that the prefabricated elastic layer is completely attached to the bottom-coat adhesive layer, and then fixed bricks are flatly pressed on the peripheral edges of the prefabricated elastic layer until the bottom-coat adhesive of the bottom-coat adhesive layer for bonding with the prefabricated elastic layer is completely solidified;
5) In the step 4), before the bottom coating adhesive layer is not solidified, the paved coiled material is prevented from moving, the phenomenon that the abutted seam is too large or the local hollowing is caused due to the disturbance of the coiled material is avoided, and the selection standard of the fixed brick is to select bricks which have high specific gravity, flat bottom surface, no cracking and no dust falling;
6) Setting a self-leveling reinforcing layer:
the two-component elastomer glue is mixed according to the weight ratio of 100 to 87, the mixture is uniformly stirred and then coated on the prefabricated elastic layer, and a self-leveling reinforcing layer is formed after curing, in the embodiment 1, the two-component elastomer polyurethane glue is used for 2.4, and the thickness of the self-leveling reinforcing layer is 2mm.
7) Setting an anti-slip surface layer:
the two-component elastomer polyurethane glue is uniformly mixed and stirred according to the weight ratio of 2, and then is coated on the upper part of a self-leveling reinforcing layer in a scraping manner, ethylene-propylene-diene monomer particles (with the particle size of 0.1-4 mm) are thrown on the liquid surface of an elastomer, and after solidification, redundant ethylene-propylene-diene monomer particles are cleaned up to form an anti-slip surface layer, wherein the weight ratio of each square meter used in the step is 2.5 kg for the two-component elastomer polyurethane glue of 1, the weight ratio of the ethylene-propylene-diene monomer particles is 2.8 kg, and the thickness of the anti-slip surface layer is 3mm.
In this embodiment 3, after the construction sequence is completed, the construction process needs to be performed for 8 to 12 hours, and after the surface material is completely cured, a runway line is drawn, and then the construction process can be opened for use after natural curing for 3 to 5 days.
The physical properties of this example 3 are shown in the following tables 5 and 6:
Figure BDA0003903119840000121
Figure BDA0003903119840000131
table 5: the physical properties required by the embodiment 3 are compared with those required by a common prefabricated plastic track product and a new national standard GB 36246-2018.
Physical mechanical performance index items New national standard index This example Common prefabricated comparative example
Tensile Strength/(MPa) ≥0.5 1.62 0.62
Elongation at Break/(%) ≥40 196 50
Table 6: in this example 3, the tensile strength and elongation at break after 500 hours of aging resistance required by the common prefabricated plastic track product and the new national standard GB36246-2018 are compared.
According to the 3D air track system based on the foamed prefabricated elastic layer and the construction method, the advantages and the disadvantages of a prefabricated rubber and polyurethane plastic sports field in the prior art are known, so that the 3D air track system based on the foamed prefabricated elastic layer and the construction method are provided, and all the raw materials used in the method are environment-friendly materials; the prefabricated buffer layers are prefabricated in a factory, the thickness is uniform, the self-leveling reinforcing layer and the anti-slip surface layer are constructed on site, gaps left when the prefabricated elastic layer is laid can be perfectly covered, the whole seamless structure is formed, and the whole thickness is well controlled; the prefabricated elastic layer is internally provided with a large number of closed micro air bags, the micro air bags can effectively accumulate and release energy after each stress, excellent shock absorption and buffering performance can be provided, accidents of falling injury and collision injury caused by activities and playing of a user on the ground can be well avoided, the movement energy consumption of the user during running can be reduced, and the shock absorption performance is still excellent even in winter, so that the movement performance of the whole system is better. The practicality of the thermoplastic polyurethane material ensures that the whole runway system has excellent tensile strength and elongation at break, and the whole system has short construction period, long service life and higher comprehensive cost performance.
However, those skilled in the art should recognize that the above-described embodiments are illustrative only and not limiting to the present application, and that changes and modifications to the above-described embodiments are intended to fall within the scope of the claims of the present application, provided they fall within the true spirit and scope of the present application.

Claims (10)

1. A3D air track system based on foaming prefabricated elastic layer, includes basic unit (1), its characterized in that:
the base layer (1) is formed by paving asphalt concrete, a bottom-coating adhesive layer (2) is arranged on the base layer, a prefabricated elastic layer (3) is arranged on the bottom-coating adhesive layer, a self-leveling reinforcing layer (4) is arranged on the prefabricated elastic layer, and finally, an anti-skid surface layer (5) is arranged on the self-leveling reinforcing layer (4), namely, the structures of the base layer, the bottom-coating adhesive layer, the prefabricated elastic layer, the self-leveling reinforcing layer and the anti-skid surface layer are formed from bottom to top, and the layers are connected into a whole in a bonding mode;
the base coat adhesive layer (2) is formed by coating, rolling or spraying polyurethane adhesive on the base layer (1), the thickness of the base coat adhesive layer is 0.1-1 mm, and the dosage of the adhesive per square meter is 0.11-1.1 kg;
the prefabricated elastic layer (3) is a prefabricated part, and has the size of 0.5-3 m in width, 6-30 m in length and 3-30 mm in thickness;
the self-leveling reinforcing layer (4) is formed by self-leveling after blade coating of two-component polyurethane, the thickness of the self-leveling reinforcing layer is 2-10 mm, and the dosage of the polyurethane per square meter is 2.4-12 kg;
the thickness of the antiskid surface layer (5) is 2-10 mm.
2. A 3D air track system based on a foamed preformed elastic layer according to claim 1, characterized in that said preformed elastic layer (3) is in particular: the thermoplastic polyurethane membrane with the thickness of 1-10 mm is subjected to hot melting by adopting a calendering foaming process to foam to form an integral structure, the structure is filled with closed micro air bags, and the foamed thermoplastic polyurethane is molded, cooled and shaped and then rolled to form the required prefabricated elastic layer.
3. 3D air track system based on foaming preformed elastic layer according to claim 2, characterized in that the preformed elastic layer (3) uses thermoplastic polyurethane film, which is one or more of thermoplastic polyurethane, polyolefin, polystyrene, styrene, polyvinyl chloride and high density polyethylene.
4. A 3D air track system based on foamed preformed elastic layer according to claim 2, characterized in that the preformed elastic layer (3) is controlled to have a compacted thickness of 3-50 mm during hot melting and extrusion, the impact absorption of the formed preformed elastic layer is 10-80%, the tensile strength of the preformed elastic layer is 0.1-2 MPa, and the elongation at break is 10-300%.
5. A 3D air track system based on foamed preformed elastomer, as claimed in claim 2, characterized in that the hot-melt temperature of the preformed elastomer (3) when calendered and foamed is: at 160-240 ℃, the closed-pore micro-air sac formed after calendering and foaming is circular or elliptical, the diameter is 0.01-3 mm, and the bulk density is 15-200 kg/m 3 。
6. The 3D air track system based on the foaming prefabricated elastic layer as claimed in claim 1, wherein the two-component polyurethane of the self-leveling reinforcing layer (4) is formed by uniformly mixing and stirring 100 parts of the A component and 87 parts of the B component by the two-component elastomer glue and then blade-coating the mixture on the prefabricated elastic layer (3), wherein the thickness of the self-leveling reinforcing layer is 2-10 mm, and the dosage of the two-component elastomer glue is 2.4-12 kg.
7. The 3D air track system based on the foamed prefabricated elastic layer as claimed in claim 1, wherein the anti-skid surface layer (5) is made of single/double component polyurethane glue mixed ethylene propylene diene monomer rubber particles and ethylene propylene diene monomer rubber particle powder, is formed by on-site paving, pouring or spraying, and is bonded with the prefabricated elastic layer (4) after being cured to form the surface of the plastic track.
8. The 3D air track system based on the foaming prefabricated elastic layer as claimed in claim 6, characterized in that the ethylene propylene diene monomer particles adopted in the anti-skid surface layer (5) have the particle size of 0.1-4 mm and are irregularly cut.
9. A construction method of a 3D air track system based on a foamed prefabricated elastic layer, based on the 3D air track system based on a foamed prefabricated elastic layer of any one of the preceding claims, comprising the following specific steps:
1) First, the base layer (1) is processed:
the asphalt concrete used as the base layer is hard, dry and bearable, has no loose particles, oil, grease, paint or other substances which obstruct adhesion, and the uneven parts need to be polished;
2) Providing a primer adhesive layer (2):
cleaning the area of a foundation layer to be constructed by using a blower before construction to ensure that the ground is dry and free of impurities, scraping, spraying or rolling polyurethane adhesive on the foundation layer (1), wherein the range of a laying surface is required to be completely sprayed in place, and a leakage area is not required to be left, so that a bottom coating adhesive layer (2) adhered with the foundation layer is formed, the using amount of the polyurethane adhesive per square meter in the step is 0.11-1.1 kg, and the thickness of the bottom coating is 0.1-1 mm;
3) Providing a preformed elastic layer (3):
within 30 minutes after the polyurethane adhesive used for the bottom coating adhesive layer (2) is blade-coated, each prefabricated buffer layer roll is unfolded and is laid on the bottom coating adhesive layer in an extrusion mode, each prefabricated buffer layer roll is tightly connected with each other to reduce gaps, and after the laying is finished, the prefabricated buffer layers are rolled in the same direction by a roller, so that the prefabricated buffer layers are completely attached to the upper part of the bottom coating adhesive layer, and then fixed bricks are flatly pressed on the peripheral edges of the prefabricated buffer layers until the bottom coating adhesive of the bottom coating adhesive layer for bonding with the prefabricated buffer layers is completely solidified;
4) In the step 3), before the bottom coating adhesive layer (2) is not solidified, the prefabricated buffer layer (3) laid is prevented from moving, the phenomenon that the joints of the prefabricated buffer layer are too large or the buffer layer is locally bulged is prevented from being disturbed, and in addition, the selection standard of the fixed bricks is that the bricks are preferably selected to have high specific gravity, flat bottom surface, no cracking and no dust falling.
5) Setting a self-leveling reinforcing layer (4):
the self-leveling reinforcing layer is formed by uniformly mixing and stirring 100 parts of component A and 87 parts of component B and then blade-coating the mixture on the prefabricated elastic layer (3) to form the self-leveling reinforcing layer, wherein 2.4-12 kg of two-component elastomer polyurethane glue is used per square meter, and the thickness of the self-leveling reinforcing layer is 2-10 mm.
6) Arranging an anti-slip surface layer (5):
the anti-skid surface layer is formed by uniformly mixing and stirring another two-component elastomer polyurethane glue according to the weight ratio of 2;
7) Standing for 8-12 hours after the step 5) is finished, drawing a runway line after the liquid material is completely cured, and then naturally curing for 3-5 days to be formally opened for use.
10. The construction method of the 3D air track system based on the foaming prefabricated elastic layer according to claim 9, characterized in that the step 6) is provided with an anti-slip surface layer (5), and ethylene propylene diene monomer particles with the particle size of 0.5-3 mm, ethylene propylene diene monomer particle powder with the particle size of 0.1-0.5 mm, single-component polyurethane glue and color paste, wherein the 4 materials are mixed according to the weight ratio of 14:1:10:5 after being mixed and stirred evenly, the mixture is sprayed on the upper part of the self-leveling reinforcing layer (4) by a spraying machine, the spraying process needs to be carried out for 1 time respectively in the positive direction and the negative direction, in the step, 1.4 kilograms of ethylene propylene diene monomer particles, 0.1 kilogram of ethylene propylene diene monomer particle powder, 1 kilogram of single-component polyurethane glue and 0.5 kilogram of color paste are used per square meter, and the thickness of the anti-skid surface layer is 3mm.
CN202211296979.2A 2022-10-21 2022-10-21 3D air track system based on foaming prefabricated elastic layer and construction method Pending CN115491949A (en)

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