Sound insulation internal thermal insulation reinforced concrete bearing floor slab structure

Abstract

The utility model discloses a sound insulation and internal thermal insulation reinforced concrete bearing floor structure. A vapor barrier (2), polyurethane (3), reinforcing steel bars (4) and concrete (5) are sequentially combined on the surface of a floor (1). The vapor-proof layer is arranged on the floor layer, then the foamed polyurethane is sprayed on the floor layer, and the cast-in-place reinforced concrete composite structure is combined, so that the damp-proof, sound-insulation, heat-preservation and anti-cracking performance is remarkably improved, an anchoring structure is omitted, the thickness of a floor ground construction layer can be reduced, energy consumption is reduced, and a surface floor is not prone to being separated from a structural floor; the floor slabs coated with the air isolation layers on the inner side and the outer side and the cast-in-place reinforced concrete are solidified into a whole, the advantages of various materials are complementary, and the waterproof performance of the reinforced concrete structure is enhanced; and the overall performance and rigidity of the wall are improved. The waterproof and heat-insulating effects are good, the step of additionally arranging a heat-insulating and sound-insulating layer in the later period is omitted, the construction period is short, construction is easy, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building floor structures for insulation, absorption or reflection of heat, sound or noise of IPC classification E04B1 / 74, and in particular relates to a structural innovation and improvement technology for energy-saving and heat-insulating building floors. Background Art

[0002] The floor is a load-bearing component that divides the space of a house horizontally, and it is crucial in the structure of a house.

[0003] Reinforced concrete floor slab is the most widely used type of floor slab in modern building structures. According to different construction methods, it can be divided into cast-in-place floor slab, prefabricated floor slab and assembled integral floor slab. For cast-in-place reinforced concrete floor slab, the construction process requires setting up formwork, placing steel bars, pouring concrete and performing maintenance. For prefabricated floor slab, the floor slab components need to be pre-fabricated in the factory and then installed on site.

[0004] There are many patent applications for technologies related to floor slab development.

[0005] China Construction Science and Engineering Group Co., Ltd. filed patent application 202223274054.6 to disclose a wall insulation structure, including two steel sections and foam glue filled between the two steel sections, the two steel sections are located at the cracks of the wall, and the wall cracks are provided with insulation boards located between the wall and the two steel sections. Two steel sections are arranged at the cracks of the wall, and foam glue is filled between the steel sections, which can produce a sealing effect on the cracks of the wall to cut off heat, and the foam glue is used to seal the space between the two steel sections, further increasing thermal resistance and ensuring the thermal insulation effect of the wall.

[0006] Patent application 202321663835.6 discloses a prefabricated floor structure, including a light steel skeleton module, an aerated concrete matrix is ​​arranged on the outer side of the light steel skeleton module, installation grooves are arranged at equal intervals on the light steel skeleton module, a thermal insulation and sound insulation module is nested inside the installation groove, and foam concrete is filled between the thermal insulation and sound insulation module and the inner wall of the installation groove.

[0007] Patent application 202221121529.5 discloses an assembled floor, including decorative panels, quick-drying glue, polyurethane foam, and structural floor slabs. Its main technical solution is that there is quick-drying glue under the back of at least one decorative panel and above the structural floor slab, and polyurethane foam is used to fill the gap between the bottom of the back of the decorative panel and the top of the structural floor slab.

[0008] Patent application 202310694720.1 relates to an integrated wall structure and construction process of on-site poured polyurethane sandwich insulation structure. It includes an outer protective plate and an inner protective plate composed of concrete wall panels, and an insulation layer substrate is poured between the outer protective plate and the inner protective plate. The excellent thermal insulation performance, low density, excellent self-adhesive performance, and thermal insulation performance of the polyurethane thermal insulation substrate are fully utilized to composite the inner and outer protective plates together to form a whole.

[0009] At present, most of the existing prefabricated floor slabs are made by pouring concrete on a steel frame. In order to make up for the poor insulation and sound insulation effects, it is necessary to add a thermal insulation and sound insulation layer on top of the floor slab after it is laid. This method increases the amount of work and consumes materials and labor in actual operation. In actual use, the floor slabs of relocation houses often have some problems, such as cracking, leakage, poor flatness, poor sound insulation, etc. Polyurethane materials have good waterproof effects, and semi-open-cell polyurethane has good sound absorption effects.

[0010] The board-type insulation material + concrete system is still the most commonly used system for floors. Its disadvantages are: the system requires the floor to have a high degree of natural flatness. Otherwise, after the board is laid, the flatness error is large, and there is a certain gap between the board and the floor, which is easy to further expand the cracking of the concrete and the surface. However, spray polyurethane is seamlessly adsorbed to the floor surface, has no requirements for the flatness of the floor, and greatly reduces the risk of concrete cracking.

[0011] In recent years, due to the frequent occurrence of accidents caused by external insulation of building exterior walls, some cities have begun to gradually ban the use of external insulation construction plans, and internal insulation of exterior walls has begun to be widely used as a solution to this problem.

[0012] At present, the commonly used system for exterior wall insulation is the board-type insulation material + thin plaster system. The disadvantage of this system is that it is heavy and the construction is limited by the size of the material itself and the on-site structure. Therefore, it is inevitable to cut the material. At the same time, a hot and cold bridge effect will appear in the board joints, which greatly reduces the insulation performance of the system. Utility Model Content

[0013] The technical problem to be solved by the present invention is that in response to the above-mentioned existing technical problems and needs, the present invention proposes a sound-insulating internally-insulated reinforced concrete load-bearing floor structure, so that the internal insulation system of the floor has excellent and stable insulation performance, and improves the sound insulation, thermal insulation and anti-cracking effects.

[0014] To this end, the utility model comprises: a vapor barrier, polyurethane, steel bars and concrete. The vapor barrier, polyurethane, steel bars and concrete are sequentially combined on the surface of the floor.

[0015] The vapor barrier layer is an air film, vapor barrier film, moisture-proof primer or cyanogen condensate on the floor surface by rolling and coating the base interface agent, and the thickness of the vapor barrier layer is controlled at 0.3mm to 0.5mm.

[0016] The polyurethane spraying thickness is preferably 1 cm.

[0017] The polyurethane spraying density needs to be greater than 55 density.

[0018] The polyurethane is semi-open-cell polyurethane.

[0019] Furthermore, in order to achieve the above-mentioned purpose, the present invention is configured as follows:

[0020] In particular, the steel bars are placed on the upper side of the polyurethane sound insulation layer in a binding manner, and the position where the steel bars are placed should not be lower than the middle position of the concrete casting structure.

[0021] In particular, a protective layer is applied on the outer surface of the concrete using 1:3 cement mortar.

[0022] Compared with the prior art, the beneficial effects of the utility model are as follows: by setting a vapor barrier layer on the floor layer and then spraying foamed polyurethane combined with a cast-in-place reinforced concrete composite structure, the moisture-proof, sound-proof, heat-insulating and anti-cracking performances are significantly improved. Moreover, compared with the prior art, the anchoring structure is omitted, the thickness of the floor construction layer can be reduced, energy consumption can be reduced, the surface floor is not easy to separate from the structural floor, and the installation process is simple. The foamed polyurethane strengthens the connection effect, and the floor coated with the vapor barrier layer on the inside and outside and the cast-in-place reinforced concrete are solidified to form a whole. The advantages of various materials complement each other. The polyurethane makes up for the brittleness of the concrete structure and strengthens the waterproofness of the reinforced concrete structure; improves the overall performance and rigidity of the wall. A good thermal insulation and sound insulation effect is obtained, the waterproof and heat insulation effect is good, the overall strength is high, the step of adding a thermal insulation and sound insulation layer in the later stage is eliminated, the construction period is short, the construction is easy, and the construction efficiency is improved. It has a good application prospect in the field of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings are for illustration only and should not be construed as limiting the present invention in any way. By referring to the following drawings, readers can understand the embodiments of the present invention and further understand the advantages and technical features of the present invention.

[0024] Figure 1 This is a schematic diagram of the cross-sectional structure of Example 1 of the utility model.

[0025] Reference numerals include:

[0026] 1- Floor slab, 2- Vapor barrier, 3- Polyurethane, 4- Steel bars, 5- Concrete. DETAILED DESCRIPTION

[0027] It should be noted that:

[0028] The terms "comprise", "comprises", "having" and any variations thereof are intended to cover other possible options under the same logic that are not listed. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatus.

[0029] In the description of the present utility model, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In order to enable those skilled in the art to better understand the scheme of the utility model, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only an embodiment of a part of the utility model, rather than all the embodiments.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by ordinary technicians in the field to which the utility model belongs. When there is a conflict, the definitions in this specification shall prevail.

[0033] The design of the floor slab needs to consider its load-bearing capacity, rigidity, durability and other factors, and at the same time, it needs to meet the functional and aesthetic requirements of the building. When designing the floor slab, the thickness, reinforcement and other parameters of the floor slab should be determined according to the span of the room, the load size, the use requirements and other factors. The floor slab has the function of bearing all the static loads, live loads and self-weight on the floor. The floor slab plays a horizontal supporting role for the wall body, can maintain the stability of the wall column, and can withstand the wind load, earthquake load and other loads transmitted in the horizontal direction, and transmit these loads to the wall and column, and then from the wall and column to the foundation. The floor slab can separate the building into several floors in the height direction. The floor slab is also required to have multiple functions such as thermal insulation, heat insulation, sound insulation, fire prevention, waterproofing and moisture resistance.

[0034] As a high-performance thermal insulation and sound insulation material, polyurethane has excellent thermal insulation, sound insulation and durability, and is very suitable for internal insulation and sound insulation treatment of floor slabs. The thermal conductivity of polyurethane materials is low, usually between 0.015 and 0.025 W / (m·k), which means that it has good thermal insulation performance, can effectively reduce heat transfer, and improve the energy efficiency of buildings. Polyurethane materials also have good sound insulation effects, which can effectively reduce the sound transmission between the upper and lower floors of the floor slabs and improve the comfort of the living or working environment. Polyurethane materials have a high bonding strength with general wall materials, and a continuous insulation layer can be formed without the use of additional adhesives and anchors to ensure the bonding effect between the insulation material and the floor slab. Advantages of internal insulation of spraying polyurethane sound insulation on floor slabs. The polyurethane insulation layer can effectively reduce the thermal conductivity of the floor slab, reduce heat loss, and improve the thermal insulation performance of the building. The sound insulation effect of polyurethane materials is significant, which can significantly reduce the sound interference between the upper and lower floors of the floor slabs and improve the quietness of the living or working environment. The polyurethane material is sprayed on the floor to form an insulation layer quickly and evenly, thus improving construction efficiency.

[0035] The principle of this utility model is that compared with the external wall insulation system, the external wall insulation system has better safety. On the one hand, the safety of the external wall insulation system is completely unaffected by the building height and external environmental factors; on the other hand, the external wall insulation system is easy to construct and has no high-altitude operation risks. While ensuring construction safety and quality safety, it greatly shortens the construction period and cost. Spraying polyurethane has good thermal insulation performance. According to energy-saving specifications, 1cm thick polyurethane can be the same as 3cm extruded board, greatly improving the utilization of indoor space and improving social and economic benefits.

[0036] The utility model comprises: a vapor barrier 2, polyurethane 3, steel bars 4 and concrete 5.

[0037] The utility model provides a spray polyurethane system for thermal insulation of building exterior walls. A vapor barrier layer is coated on the surface of the floor slab, which can not only enhance the bonding effect between the polyurethane material and the floor slab, but also prevent water vapor penetration and avoid the decline of waterproof performance. The spray polyurethane system ensures the continuity of thermal insulation, greatly improves the thermal insulation performance, and makes the thermal insulation performance more stable. The use of the exterior wall spray polyurethane internal insulation system, on the one hand, polyurethane has a lower thermal conductivity than other thermal insulation materials, and on the other hand, the on-site spraying of polyurethane for foaming is not limited by factors such as structural size, which ensures the continuity of thermal insulation, avoids the cold and hot bridge effect, and greatly improves the thermal insulation performance.

[0038] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0039] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

[0040] The content of the present invention can be more easily understood by selecting the following preferred implementation methods and embodiments of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by ordinary technicians in the field to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0041] Embodiment 1: As attached Figure 1 As shown, the surface of the floor slab 1 is sequentially combined with a vapor barrier 2, polyurethane 3, steel bars 4 and concrete 5.

[0042] In the above, the polyurethane 3 is sprayed on the vapor barrier 2 in layers by using an on-site spray foaming process to ensure a certain degree of flatness. The spray polyurethane is sprayed on-site by using an on-site spray foaming process. Compared with conventional plate materials, the seamless bonding of the on-site spray polyurethane and the floor slab solves the risk of cracking of the upper concrete due to loose bottom materials.

[0043] In particular, the polyurethane 3 has low thermal conductivity and good thermal insulation performance, and the spraying thickness is preferably 1 cm, which can increase the indoor usable space while meeting the energy-saving requirements.

[0044] In particular, the spraying density of the polyurethane 3 needs to be greater than 55 density to have a certain waterproof effect.

[0045] In particular, the polyurethane 3 is a semi-open-cell polyurethane, which has a better sound absorption effect.

[0046] In particular, the steel bar 4 is placed on the upper side of the polyurethane 3 sound insulation layer in a standard binding manner, and the position of the steel bar 4 should not be lower than the middle position of the cast structure of concrete 5. Polyurethane has good bonding ability, and if there is floating or sinking, it will be affected, so an interface agent is used to improve the bonding strength.

[0047] In the embodiment of the utility model, the base interface agent is rolled on the basic surface of the floor slab 1 to form a vapor barrier 2. The rigid foam polyurethane is sprayed on the upper side of the vapor barrier 2 to form a polyurethane layer 3. The foamed polyurethane has both filling and bonding properties. No anchor structure is required. The steel bars 4 are tied above the polyurethane layer 3 and concrete 5 is poured. Concrete 5 is poured in the steel bar 4 structure, and the multi-layer structure formed by the floor slab 1, the vapor barrier 2, the polyurethane 3, the steel bars 4 and the concrete 5 has a polyurethane-steel-concrete composite structure as the core.

[0048] In the embodiment of the utility model, the base interface agent can be a breathable film, a vapor barrier film, a moisture-proof primer or a cyanogen, and the base interface agent is directly coated on the surface of the floor 1 to form a vapor barrier layer 2, which is used to block the external water vapor from penetrating into the polyurethane 3 insulation layer. The thickness of the vapor barrier layer 2 is controlled to be 0.3mm to 0.5mm.

[0049] In the embodiment of the utility model, cyanogen is a waterproof and anti-corrosion material with multiple excellent properties, and is widely used in various fields that require waterproof and anti-corrosion treatment. Cyanogen is also known as cyanogen waterproof and anti-corrosion material, which is a chemical slurry base material, a two-component polymer molecule modified base polymer waterproof and anti-corrosion system with cyanogen polymer as the base material and modified epoxy resin emulsion. Cyanogen coating has high strength and wear resistance, can effectively resist wear and scratches, and keep the coating intact for a long time. Cyanogen coating has good waterproof performance, can effectively block the erosion of water and moisture, and protect the surface from moisture and mildew. Cyanogen coating has high corrosion resistance, can effectively resist the erosion of various chemical substances, such as acid, alkali, salt, etc., to keep the surface from corrosion. Cyanogen coating has good insulation performance, can effectively prevent the conduction of current, and protect the surface from damage by electrochemical corrosion. Cyanogen coating can remain stable at higher temperatures and adapt to the use requirements of various high temperature environments, such as being able to withstand 250°C high temperature. Cyanogen coating is an environmentally friendly coating that does not contain harmful substances, is harmless to the environment and human health, and meets the requirements of modern environmental awareness. Cyanide waterproof and anti-corrosion coatings are widely used in various fields that require waterproof and anti-corrosion treatment, including but not limited to: underground pipelines, sewage treatment plants, acid pools, alkali pools, coking plants and other enterprises' sewage pools, pipelines, and storage tanks. Steel bridge deck paving, cement concrete bridge deck paving, tunnel pavement paving, cement concrete pavement overlay. Anti-seepage and waterproofing treatment for underground projects, anti-seepage and waterproofing treatment for water conservancy projects. Anti-corrosion of equipment, containers, and flues that have excellent high temperature resistance in various acid, alkali, and salt environments and require corrosion protection. Construction requirements include: The surface should be fully prepared, rust, oil stains, and other contaminants should be removed, and the surface should be flat and clean. Before painting, a layer of primer should be applied first to improve the adhesion of the coating and ensure uniform distribution of the paint.

[0050] The implementation principle of this embodiment is: before the construction of spraying foamed polyurethane 2, the edge of the construction range is blocked with slats, and the inside is designed according to the design and construction requirements. The proportion of foamed polyurethane raw materials is used, and the polyurethane density is designed to be 22Kg / m 3 Before construction, the base layer of the vapor barrier 2 needs to be inspected and accepted to check whether the dust on the base layer of the vapor barrier 2 is clean.

[0051] Preferably, the construction process includes: review and confirmation of the construction plan → preparation → edge sealing → inspection and sealing of appearance gaps → limit protection → spraying of foamed polyurethane → cleaning of overflowed polyurethane → sealing and cleaning of holes.

[0052] Preferably, the foaming of the foamed polyurethane is observed while pouring, and the pouring time is fine-tuned in time according to the foaming speed and density; before pouring the polyurethane, pre-spray it in the waste barrel for 5 to 10 seconds to observe whether the polyurethane foaming meets the design requirements; the pouring time is 3 to 5 seconds, the pouring interval is controlled at 1 to 3 seconds, the pouring interval between rows is 25 to 30 seconds, and the foaming of the polyurethane is closely monitored during the pouring; when pouring polyurethane, pour from the outside first, and then pour from the outside to the inside in sequence to ensure that the polyurethane foam can fully fill the cavity; when pouring polyurethane at the side blocking part, it is convenient to observe the foaming of the lower layer of polyurethane, and can also release the lateral tension generated by the expansion of polyurethane foaming to ensure that the polyurethane foam fills the entire cavity; during the polyurethane pouring process, the same pouring order should be maintained.

[0053] Before spraying polyurethane, the base layer of the vapor barrier layer 2 of the floor 1 needs to be cleaned and leveled to ensure that there is no oil, loose objects, etc. Use professional equipment to evenly spray the polyurethane material on the floor 1, and pay attention to controlling the spraying thickness and uniformity. After spraying, the insulation layer needs to be maintained to ensure that it is fully cured and achieves optimal performance. Polyurethane materials with reliable quality and excellent performance should be selected to ensure thermal insulation and sound insulation effects. During construction, the ambient temperature and humidity should be appropriate, and construction should be avoided under extreme weather conditions. Safety precautions should be taken during construction to prevent polyurethane materials from splashing into sensitive parts such as eyes or skin. Spraying polyurethane sound insulation and internal insulation on floor 1 is an effective energy-saving and comfort-enhancing technology with broad application prospects. In practical applications, design and construction should be carried out according to specific needs and conditions to ensure the best results. During construction, attention should be paid to construction quality and safety to ensure the bearing capacity and durability of the floor.

[0054] In the implementation of this embodiment, the overflowed polyurethane is cleaned. During the process of pouring polyurethane, a small amount of polyurethane will overflow while sealing the possible small gaps. After the pouring operation of the entire wall is completed, it will be cured for 72 hours, all fixed protective measures will be removed, and the overflowed polyurethane will be cleaned up in time.

[0055] In the embodiment of the utility model, further, the sprayed polyurethane 3 is sprayed on the vapor barrier layer 2 in layers by using an on-site spray foaming process to ensure a certain flatness.

[0056] In the embodiment of the utility model, the steel bars 4 are placed on the sound insulation layer of the polyurethane 3 in a standard binding manner.

[0057] In the implementation of this embodiment, concrete 5 is constructed according to the design: cement is usually 300 to 600 kg, and the specific amount is related to the design bulk density or design density. For example, when the bulk density of the roof is 350 kg, the cement dosage is about 300 kg; when the bulk density of the indoor cushion layer is 400 to 600 kg, the cement dosage is 350 to 550 kg. The dosage needs to be determined according to the amount of cement and the slump requirements of the concrete, and usually follows the principle of the ratio of cement to water. The dosage of the foaming agent varies depending on the performance of the manufacturer, and the specific dosage needs to be determined according to the type, performance and construction requirements of the foaming agent. Generally speaking, the dosage of the foaming agent will be controlled within a certain range to ensure the stable performance of the foamed polyurethane layer. Other additives such as fly ash, silica fume and other additives can also be added in appropriate amounts if certain properties of the concrete such as strength and durability need to be improved. The dosage of fly ash generally does not exceed 40%, otherwise it may affect the hardness of the foamed concrete. Then, a protective layer is applied on the outer surface of the concrete 5 using 1:3 cement mortar, and any gaps that may occur are leveled.

[0058] Based on the above embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention, so as to avoid exhaustively listing all implementation methods that are unnecessary and impossible to list comprehensively.

Claims

1. A soundproof internal heat-insulating reinforced concrete load-bearing floor structure, comprising a vapor barrier (2), polyurethane (3), steel bars (4) and concrete (5); characterized in that: The surface of the floor slab (1) is sequentially combined with a vapor barrier (2), polyurethane (3), steel bars (4) and concrete (5).

2. The sound insulation internal insulation reinforced concrete load-bearing floor structure according to claim 1 is characterized in that: The vapor barrier layer (2) is an air film, vapor barrier film, moisture-proof primer or cyanogen condensate formed on the surface of the floor slab (1) by coating the base interface agent with a roller brush. The vapor barrier layer (2) has a thickness of 0.3 mm to 0.5 mm.

3. The sound insulation internal insulation reinforced concrete load-bearing floor structure according to claim 1 is characterized in that: The polyurethane (3) is sprayed with a thickness of 1 cm.

4. The sound insulation internal insulation reinforced concrete load-bearing floor structure according to claim 1, characterized in that: The spraying density of the polyurethane (3) needs to be greater than 55 density.

5. The sound insulation internal insulation reinforced concrete load-bearing floor structure according to claim 1, characterized in that: The polyurethane (3) is a semi-open-cell foamed polyurethane layer.

6. The sound insulation internal insulation reinforced concrete load-bearing floor structure according to claim 1, characterized in that: The steel bars (4) are placed on the upper side of the polyurethane (3) sound insulation and heat preservation layer in a binding manner, and the position where the steel bars (4) are placed is not lower than the middle position of the concrete (5) pouring structure.

7. The sound insulation internal insulation reinforced concrete load-bearing floor structure according to claim 1, characterized in that: A protective layer of 1:3 cement mortar is applied on the outer surface of the concrete (5).

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