Heterogeneous fabricated concrete grating composite wallboard with efficient thermal insulation performance

Abstract

The invention belongs to the field of constructional engineering, and relates to a heterogeneous fabricated concrete grating composite wallboard with efficient thermal insulation performance, which comprises an inner acanthus, a sandwich thermal insulation board and an outer acanthus which are sequentially arranged, the inner acanthus is provided with an inner side surface and an outer side surface, a plurality of grooves are uniformly formed in the outer side surface of the inner acanthus at intervals, and the outer acanthus is provided with a plurality of reinforcing ribs; the grooves are filled with heat preservation materials, and the inner acanthus, the sandwich heat preservation plate and the outer acanthus are connected through connecting pieces. According to the heterogeneous fabricated concrete grating composite wallboard designed by the invention, the effect of reducing the self weight of a wall body is achieved by gridding an inner leaf plate in a traditional fabricated sandwich thermal insulation wallboard; the thermal performance can be effectively improved by adopting the sandwich insulation board.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering, and in particular relates to a heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance. Background Art

[0002] The wall panels used in the traditional building envelope structure of villages and towns mainly include brick-wood wall panels, reinforced concrete wall panels and brick-concrete wall panels. In actual applications, these wall panels have a large deadweight due to the high density of the wall panel base material, which will increase the load of the building and reduce the structural bearing capacity of the building. Secondly, the construction of traditional enclosure systems is difficult. Traditional wall panels need to be wet-constructed on site, which consumes a lot of manpower, material resources and time, and also produces a lot of pollutants and construction waste, increasing building carbon emissions. Thirdly, the cost is expensive. Since the production and construction of traditional wall panels require a lot of human resources and engineering technology, the manufacturing cost and construction cost are high.

[0003] CN111197379A provides an assembled composite thermal insulation wall structure and a corresponding assembly method. The composite thermal insulation wall is connected to the building structure by mounting frame plates, mounting fixing blocks, connecting blocks and mounting slots, and the assembly is connected by concrete pouring to improve the thermal insulation performance of the entire wall. In addition, the building strength of the overall assembled structure is enhanced by transverse tie bars and oblique tie bars, thereby improving the compressive and tensile strengths of the structure.

[0004] This patent solves the problem of long construction period on site to a certain extent. It effectively shortens the construction period by prefabricating some components, and the sandwich concrete pouring method improves the integrity of the wall. However, pouring concrete directly in the sandwich makes the wall heavy, which still puts a certain test on the foundation load.

[0005] CN109680867A is an assembled steel plate composite insulation wall panel structure. The wall panel structure includes two opposing wall panel frame panels, two layers of assembled assembly panels are arranged between the two wall panel frame panels, these assembly panels are arranged in parallel, and the two sides of each assembly panel are respectively fixed to a wall panel frame panel; two layers of parallel prefabricated insulation layers are arranged between the two layers of assembly panels, these prefabricated insulation layers are attached to the inner surface of the assembly panels, the two prefabricated insulation layers are arranged at intervals, and an internal reinforcement component is also arranged between the two wall panel frame panels.

[0006] This patent solves the problem of heavy wall weight, and the prefabricated steel structure and insulation layer effectively shorten the construction period. However, the more complex structure will lead to high production costs and a longer production cycle, and the steel structure has poor fire resistance and high maintenance costs, which cannot be widely used in rural housing.

[0007] CN115467442A discloses a low-density assembled composite heat-insulating wallboard. The wallboard includes a board body, a water storage cavity is provided at the lower end, and side flow channels are provided on both sides for introducing water into the water storage cavity, and these side flow channels are evenly arranged. An end flow channel is also provided at the upper end of the board body for introducing water into the water storage cavity, and these side flow channels and end flow channels are both connected to the water storage cavity.

[0008] This patent enhances the environmental regulation ability of the wall by adding active technology, which can ensure a better living environment for the building, and effectively prevents water from penetrating into the room by setting up a water storage cavity at the bottom. However, the complex components lead to a sharp increase in the cost of the wall, and the maintenance cost is high, which cannot meet the requirements of a long service life of prefabricated buildings in villages and towns. Summary of the invention

[0009] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a heterogeneous assembled concrete grid composite wall panel with high thermal insulation performance, which solves the following technical problems:

[0010] (1) Solved the problem of excessive weight of traditional wall panels: Brick-concrete wall panels and ordinary assembled sandwich insulation board wall panels are heavy in weight, which will bring huge loads to buildings and foundations, and easily cause safety hazards. Using prefabricated heterogeneous concrete grid wall panels with high-efficiency thermal insulation performance as the base wall to make wall panels can reduce the overall weight of composite wall panels, reduce the pressure of buildings on the foundation, and improve earthquake resistance.

[0011] (2) Solved the problem of long construction period of traditional construction methods: Traditional concrete wall panels need to be cast on site, which has a long construction period and is time-consuming and labor-intensive. However, prefabricated heterogeneous assembled concrete grid composite wall panels with high thermal insulation performance can be directly installed on site using dry connection without wet work, which greatly shortens the construction period, saves manpower and material resources, and reduces construction carbon emissions and air pollution.

[0012] (3) Solved the problem of poor thermal insulation performance of traditional wall panels: The thermal insulation performance of traditional concrete walls is poor, which easily leads to energy waste. The heterogeneous concrete grid composite wall panels with high thermal insulation performance improve the thermal performance of the wall by filling the grid with lightweight thermal insulation materials, thus saving energy and reducing consumption.

[0013] (4) Solved the problem of poor fireproof performance of traditional wall panels: Traditional village and town houses use concrete walls or brick-concrete walls, which are prone to melting and collapse in the event of fire, posing a threat to personal safety. The grid composite wall panels improve the fireproof performance of the wall by adding external blades, using high-fireproof grade insulation materials, and adding fireproof layers, thereby better protecting the safety of life and property.

[0014] In summary, the invention of the heterogeneous assembled concrete grid composite wall panel with high-efficiency thermal insulation performance effectively solves many practical problems in the construction field.

[0015] The technical solution adopted by the present invention to solve the technical problem is:

[0016] A heterogeneous assembled concrete grid composite wall panel with high thermal insulation performance includes an inner blade, a grid filling material, a sandwich insulation board, an outer blade and a connector. The inner blade is the load-bearing part of the wall, and is composed of a 200mm thick reinforced concrete grid structure, wherein the grid structure is arranged in a regular hexagon, and the grid does not completely penetrate the inner blade, but leaves 30mm.

[0017] The grille in the inner blade is in the shape of a hexagon, and the circumscribed rectangle thereof is 625 mm long and 500 mm high. In the length direction, the distance between the center points of the rectangle is 775 mm, and in the height direction, the distance between the center points is 650 mm.

[0018] The grid filling material is ecological building material straw brick or extruded polystyrene board or graphite polystyrene board or any other fiber insulation material and foam insulation material with lower density.

[0019] The sandwich insulation board is made of extruded polystyrene board (XPS) or graphite extruded polystyrene board (GEPS), which can be replaced according to cost and regional characteristics; the thickness of the sandwich insulation board is 20 to 220 mm.

[0020] The outer blade is a 60mm thick reinforced concrete slab.

[0021] The connector is a stainless steel connector, and the anchoring depth of the inner and outer blades is 50 mm.

[0022] The width of the wall panels conforms to the building bay size, with two sizes of 3600mm and 2400mm, and a height of 3200mm. To facilitate interior decoration construction, the grille opening is calculated from the outside of the inner blade, with a depth of 170mm, and no hole is opened on the indoor side for 30mm.

[0023] In the present invention, the inner blade is gridded and filled with a certain amount of thermal insulation material, and the wall structure is assembled in a "sandwich" core manner. Under the premise of ensuring the thermal insulation effect, the dead weight of the wall is effectively reduced and has a good earthquake resistance function.

[0024] The present invention is mainly used for low-rise houses in villages and towns. It is a non-homogeneous assembled concrete grid composite wall panel with high-efficiency thermal insulation performance, which is proposed to solve the problems existing in the enclosure system of villages and towns in reality.

[0025] The advantages and positive effects of the present invention are:

[0026] 1. Compared with traditional "sandwich" wall panels, the present invention adopts a 200mm thick grille-type inner blade plate, which can effectively reduce the dead weight of the wall and reduce carbon emissions during the wall panel production process. Through calculation, it is found that the wall panel using the grille-type inner blade plate can reduce the weight by about 30%.

[0027] 2. The present invention further improves the thermal insulation performance of the wall by filling the inner blade of the grid with thermal insulation material. Computer simulation shows that the difference in heat transfer coefficient between the grid composite wallboard and the traditional "sandwich" wallboard gradually decreases with the increase in the thickness of the sandwich insulation layer. Under the condition of 20mm thick sandwich insulation, the difference in heat transfer coefficient between the two is 0.283m 2 k / w, under the condition of 220mm sandwich insulation, the difference in heat transfer coefficient between the two is 0.01m 2 ·k / w.

[0028] 3. The present invention can effectively reduce the thickness of the assembled composite wallboard by filling the grille inner blade with insulation material. Computer simulation shows that, under the premise of meeting the ultra-low energy consumption standard, the present invention can reduce the thickness of the insulation layer by at least 20mm compared with the traditional wallboard.

[0029] 4. Compared with the traditional "sandwich" wallboard, the present invention adopts a fully dry bolt connection method, with 100mm wide tongues and grooves set around the wallboard, and reserved holes for tension bolts with a spacing of 300mm. The wallboard can be directly assembled on the construction site. When the components are transported to the construction site, it is only necessary to install the peripheral protective components in a certain order on site. This method can effectively reduce the environmental pollution caused by construction and shorten the construction period.

[0030] 5. The present invention uses stainless steel connectors to tie the outer blade, sandwich insulation board and inner blade together, which has excellent mechanical properties. The outer blade has no structural function and is only used for protection and decoration. By using the outer blade, the wall insulation system can have the same lifespan as the building, reducing the cost of the entire life cycle, while increasing the wall safety factor and preventing the outer wall insulation from falling off.

[0031] To sum up, the non-homogeneous assembled concrete grid composite wall panels with high-efficiency thermal insulation performance designed by the invention can achieve the effect of reducing the deadweight of the wall by gridding the inner blades in the traditional assembled sandwich insulation wall panels; the thermal performance can be effectively improved by taking the form of sandwich insulation boards. If the sandwich insulation boards are removed, the thermal performance will be significantly reduced. If normal insulation boards are taken, the deadweight of the wall will be significantly increased, and the material cost will also increase; the thermal performance of the FRP connectors used in the present invention is only 0.1% lower than that of traditional wall panels without connectors, and by filling the grids with ecological insulation materials, the green integration and development of traditional building materials and modern technologies are further promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an overall schematic diagram of the wall of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the wall of the present invention;

[0034] Figure 3 It is an elevation view of the inner blade of the concrete grid of the present invention;

[0035] Figure 4 is a cross-sectional view of the inner blade of the concrete grid of the present invention;

[0036] Figure 5 It is a schematic diagram of the connecting member of the wall of the present invention;

[0037] Figure 6 This is a diagram of the steady-state heat transfer simulation results of the present invention;

[0038] Figure 7 The working condition model of the wallboard with different filling rates of the present invention;

[0039] Figure 8 The variation rules of heat transfer resistance, thermal resistance and heat transfer coefficient under different thermal insulation filling rates of the present invention;

[0040] Fig. 9 This is the overall front elevation view of SPA-1 of the present invention;

[0041] Fig.10 This is the overall front elevation view of the SPA-2 of the present invention;

[0042] Fig.11 This is a front elevation view of the upper wall of SPA-1 of the present invention;

[0043] Fig.12 This is a front elevation view of the upper wall of SPA-2 of the present invention;

[0044] Fig.13 This is a front elevation view of the lower wall of SPA-1 and SPA-2 of the present invention;

[0045] In the figure: 1. grille; 2. inner blade; 3. sandwich insulation board; 4. outer blade; 5. connecting parts. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0047] Example 1

[0048] A heterogeneous assembled concrete grid composite wall panel with high thermal insulation performance, such as Figure 2 and Figure 5 As shown, it includes a grille 1 (with straw bricks filled inside), an inner blade plate 2, a sandwich insulation board 3, an outer blade plate 4 and a connecting piece 5.

[0049] The elevation and section of the grille 1 and the inner blade 2 are as follows: Figure 3 , Figure 4 As shown, at the same time Figure 3 It can be seen that the inner blade 2 of the wall panel, i.e. the load-bearing structure, is a 200mm thick reinforced concrete grid structure, with an insulation filling rate of 35.83% (the area of ​​the insulation material in the grid accounts for the area of ​​the entire inner blade), the grid 1 is a hexagon, the circumscribed rectangle of the grid 1 is 625mm long and 500mm high, the distance between the center points of the rectangle in the length direction is 775mm, and the distance between the center points in the height direction is 650MM. To facilitate indoor decoration construction, the opening of the grid 1 is calculated from the outdoor side of the inner blade 2, with a depth of 170mm, and no hole is opened on the indoor side of 30mm. The sandwich insulation board 3 is an XPS extruded polystyrene board (which can be adjusted according to local needs), the outer blade 4 is a 60mm thick reinforced concrete board, and the connector 5 is a stainless steel connector. The anchoring depth of the inner and outer blades is 50mm.

[0050] The inner blade 2 , the sandwich insulation board 3 and the outer blade 4 are connected by a connecting piece 5 .

[0051] The steady-state heat transfer simulation of the inner blade 2 is as follows Figure 6 As shown in the figure, the lowest temperature of the indoor surface of the wall panel is 6.02℃, the highest temperature is 16.2℃, the difference is 10.18℃, and the maximum heat flux is 104.2w / m 2 The minimum point appears at the center of the insulation filling, which is 15.6w / m 2 The ecological straw brick material filled has obvious heat insulation effect.

[0052] The grid wall panels with different window-to-wall ratios will affect the insulation filling rate of the wall and the heat transfer coefficient of the composite wall panels. In order to include as many actual working conditions as possible, according to the design rules of the wall panel grid structure, the typical wall panels are opened with a window-to-wall ratio of 0.1-0.45, with a step size of 0.05, and a total of 9 basic models with different window-to-wall ratios and different insulation filling rates are established. Figure 7 As shown, based on the area calculation of the insulation filling part and the reinforced concrete wall panel part, when the window-to-wall ratio is 0, the insulation filling part accounts for the largest proportion, which is 35.83%; when the window-to-wall ratio is 0.3, the insulation filling part accounts for the smallest proportion, which is 12.8%.

[0053] Figure 8 The heat transfer resistance, thermal resistance and heat transfer coefficient change rules under different insulation filling rates of the present invention are shown in FIG. Figure 8 It can be seen that (as the proportion of insulation filling decreases, the heat transfer coefficient of the composite wall panel will gradually increase).

[0054] The difference from Example 1 is that the filling rate of the grid insulation material is changed, and the wall insulation performance is compared. The results are shown in the following table.

[0055] Table 1 Numerical simulation results of inner leaf wall panels under different insulation filling rates

[0056]

[0057] The load-bearing performance of this material is verified by the following tests:

[0058] In this test, four concrete grid composite wall specimens were designed according to the scale ratio of 2:3 by changing the opening rate, concrete grade and wall thickness of the grid composite wall for axial compression test. SPA-1 is used as the control specimen, with an opening rate of 30%, and a hexagonal opening of 333mm×420mm, which is filled with EPS polystyrene board. The specimen wall is 1270mm long and 130mm thick. The prefabricated wall is divided into two sections, upper and lower. The tongue-and-groove joints are connected with M8 tension bolts. The lower section is 300mm high and cast with the foundation beam. The upper section is 2130mm high. The structure is equipped with a loading beam of 300mm×300mm and a foundation beam of 500mm×600mm, which are cast together with the upper wall and the lower wall respectively. The SPA-2 specimen increased the wall opening ratio to 40% by changing the size of the hexagonal opening, and the other parameters remained unchanged; the SPA-3 specimen increased the wall thickness to 200mm, and the other parameters remained unchanged; the SPA-4 specimen increased the cast concrete grade to C45, and the other parameters remained unchanged. The specific design parameters of the four specimens are shown in Table 2.

[0059] The elevations of the four specimens are shown in Figures 9 to 13 As shown, the front elevations of specimens 1, 3, and 4 Figure 1 The elevation of specimen 2 Figure 6 The size of the rectangular opening increases, and the front elevation of the lower wall of the four specimens Figure 1 To.

[0060] Table 2 Specimen design parameters

[0061]

[0062] It can be seen that in terms of axial compression bearing capacity, the opening ratio, wall thickness and concrete grade all have an impact on the ultimate bearing capacity, but the impact of wall thickness is more significant. Specifically, the opening ratio of specimen SPA-2 is 10% higher than that of SPA-1, the concrete dosage is reduced by 7.0%, and the ultimate bearing capacity is reduced by 9.6%; the concrete strength of specimen SPA-4 is 28.6% higher than that of SPA-1, the concrete dosage remains unchanged, and the ultimate bearing capacity is increased by 23%; the wall thickness of specimen SPA-3 is 50% higher than that of SPA-1, the concrete dosage is increased by 37.1%, and the ultimate bearing capacity is increased by 104.5%. It can be seen that the wall height-to-thickness ratio has a significant impact on the structural bearing capacity within a certain range.

[0063] Depend on Figure 7 It can be seen that the XPS insulation filling rate and the heat transfer coefficient of the composite wall panel are almost linearly related, but the increase of XPS material will lead to a decrease in the load-bearing performance of the wall. In this case, the maximum XPS insulation filling rate is 35.83%.

[0064] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept, which all belong to the protection scope of the present invention.

Claims

1. A heterogeneous assembled concrete grid composite wall panel with high thermal insulation performance, characterized in that: include: The inner blade, sandwich insulation board and outer blade are arranged in sequence, the inner blade has an inner side and an outer side, a plurality of grooves are evenly spaced on the outer side of the inner blade, the grooves are filled with insulation material, and the inner blade, sandwich insulation board and outer blade are connected by connecting parts.

2. The heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance according to claim 1 is characterized in that: The thickness of the inner blade is 200 mm and the material is reinforced concrete.

3. The heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance according to claim 1 is characterized in that: The shape of the groove is a regular hexagon, and the depth of the groove is 170-200 mm.

4. The heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance according to claim 3 is characterized in that: The circumscribed rectangle of the regular hexagon is 625 mm long and 500 mm wide. In the length direction, the distance between the center points of the rectangles is 775 mm, and in the width direction, the distance between the center points is 650 mm.

5. The heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance according to claim 1 is characterized in that: The heat-insulating material is straw brick or extruded polystyrene board or graphite polystyrene board.

6. The heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance according to claim 1 is characterized in that: The thickness of the sandwich insulation board is 20 to 220 mm.

7. The heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance according to claim 1 is characterized in that: The thickness of the outer blade is 60 mm and the material is reinforced concrete.

8. The heterogeneous assembled concrete grid composite wallboard with high-efficiency thermal insulation performance according to claim 1, characterized in that: The connector is a stainless steel connector, and the anchoring depth of the inner and outer blades is 50 mm.

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