Fabricated phase change composite wall and manufacturing method thereof

Abstract

The application discloses an assembled phase change composite wall and a manufacturing method thereof, and belongs to the technical field of building engineering, comprising a wall body and an assembled connecting piece; a steel reinforcement keel is poured in the wall body; the steel reinforcement keel is formed by binding and fixing vertical steel reinforcements and horizontal steel reinforcements; the vertical steel reinforcements and the horizontal steel reinforcements are longitudinally and transversely staggered to form a steel mesh; the steel reinforcement keel comprises two layers of steel meshes; the assembled connecting piece is used for butting two wall bodies during installation; a plurality of phase change material packaging boxes are arranged between the two layers of steel meshes in a horizontal direction, and the phase change material is filled in the phase change material packaging boxes, so that the mechanical properties of the wall body are improved, and the heat preservation and heat insulation effects are achieved; the application can effectively overcome the defects in the prior art, realize the rapid manufacturing of the assembled phase change wall prefabricated component, and improve the mechanical properties and heat storage capacity of the phase change wall.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building engineering, and more particularly to a prefabricated phase change composite wall and a manufacturing method thereof. BACKGROUND

[0002] Under the background of the rapid development of the global construction industry today, prefabricated walls, as an innovative building technology, are gradually becoming the focus of the industry. This wall technology leads the transformation and upgrading of the construction industry with its advantages of efficiency, environmental protection, energy saving, etc. Phase change materials have heat storage and heat release functions. Adding phase change materials to building envelopes can achieve active temperature control and reduce indoor temperature fluctuations caused by large outdoor temperature differences. However, the current technology mainly adds phase change microcapsules to building materials, which weakens the mechanical properties of concrete, and the content of the added phase change materials is relatively low, the heat storage capacity of the wall is limited, and the construction method is inconvenient. Therefore, how to provide a prefabricated phase change composite wall and a manufacturing method thereof is a problem that needs to be solved by those skilled in the art. SUMMARY

[0003] Therefore, the present application provides a prefabricated phase change composite wall and a manufacturing method thereof, which can effectively overcome the defects in the prior art, realize the rapid manufacturing of prefabricated phase change wall components, and improve the mechanical properties and heat storage capacity of the phase change wall.

[0004] The present application adopts the following technical solutions:

[0005] A prefabricated phase change composite wall comprises a wall body and a prefabricated connecting piece. A steel bar keel is poured inside the wall body and is formed by binding and fixing vertical steel bars and horizontal steel bars. The vertical steel bars and the horizontal steel bars are longitudinally and transversely staggered to form a steel mesh, which is provided with two layers. The prefabricated connecting piece is used to butt joint two walls during installation. A plurality of phase change material packaging boxes are provided between the two layers of steel mesh in the horizontal direction, and are filled with phase change materials, which are used to improve the mechanical properties of the wall and play a role in thermal insulation.

[0006] Further, a hidden pile is provided on both sides of the wall body. The vertical steel bars on both sides of the steel bar keel inside the hidden pile are horizontally bound by local reinforcing steel bars. The local reinforcing steel bars are longitudinally provided with a plurality of local reinforcing steel bars along the vertical steel bars.

[0007] Further, a connecting steel bar is further provided in the middle of the two layers of steel mesh, which is used to support the two layers of steel mesh and fix and limit the phase change material packaging boxes.

[0008] Further, the assembled connecting piece comprises a reinforcing sleeve; the reinforcing sleeve is arranged on the upper end of the middle part of the reinforcing bar joist, with the opening upward and the lower end fixedly connected with the upper end of the vertical reinforcing bar; the lower end of the vertical reinforcing bar of the middle part of the reinforcing bar joist extends downward to protrude from the wall body.

[0009] Further, the reinforcing sleeve is fixedly poured into the wall body, and a reserved opening is formed above the reinforcing sleeve during pouring of the wall body to form a reserved hole, and the connection between the upper and lower walls is realized through the reserved hole.

[0010] Further, the phase change material packaging box is arranged below the reinforcing sleeve; and the phase change material packaging box is internally packaged with phase change material.

[0011] Further, the phase change material packaging box is arranged as a thin-walled container and is made of flexible hard material; one end of the phase change material packaging box is provided with a filling hole for filling of the phase change material.

[0012] Further, the flexible hard material is polypropylene, the thickness of the wall of the phase change material packaging box is 0.5-3 mm, and the width D of the phase change material packaging box accounts for 1 / 6 to 1 / 2 of the thickness B of the wall.

[0013] Further, the phase change material is selected from n-octadecane or n-hexadecane, and the phase change temperature interval is 20-35℃.

[0014] A construction method of an assembled phase change composite wall, comprising the following steps:

[0015] S1: setting a prefabricated formwork according to the prefabricated size of the wall, and opening through holes on both sides of the prefabricated formwork for supporting the reinforcing sleeve and the vertical reinforcing bar;

[0016] S2: laying a lower steel mesh inside the prefabricated formwork, and interlacing the vertical reinforcing bar and the horizontal reinforcing bar; then arranging the connecting reinforcing bar and the vertical reinforcing bar of the upper steel mesh above the lower steel mesh, and penetrating one end of the vertical reinforcing bar at the middle position of the wall body through the prefabricated formwork, connecting the other end with the reinforcing sleeve, and making the reinforcing sleeve penetrate through the prefabricated formwork; and binding the two rows of vertical reinforcing bars on both sides of the wall body through the local reinforcing bar to form a hidden pile joist;

[0017] S3: preliminarily pouring concrete into the prefabricated formwork, and waiting for the preliminary hardening of the concrete; the thickness of the phase change material packaging box is D, and the thickness of the wall is B;

[0018] S4: after the initial pouring and hardening, evenly arranging a plurality of phase change material packaging boxes filled with phase change material on the concrete, and limiting and fixing the phase change material packaging boxes by the connecting reinforcing bar;

[0019] S5: Set the horizontal steel bars of the upper layer of steel bar net, and bundle and fix with the bottom layer, so that the phase change material packaging box is limited between the two layers of steel bar nets;

[0020] S6: Pour the remaining concrete, carry out maintenance after pouring is completed, and carry out demolding after maintenance is completed.

[0021] Compared with the prior art, the most beneficial effect of the patent is that the heat storage capacity of the fabricated enclosure wall can be greatly improved, the phase change material is separated from the traditional building material, and the problems of poor mechanical properties and construction performance caused by mixing the phase change material with the building material are effectively avoided. Secondly, the construction efficiency is improved to a certain extent, the engineering cycle is shortened, and the cost is significantly reduced. Thirdly, relying on the precise pre-processing process of the fabricated factory, the quality of the wall components is highly uniform, the quality problems that may exist in traditional on-site construction are completely eliminated, and the quality and reliability of the overall building are significantly improved. Through this technology, indoor temperature difference can be actively reduced, building indoor comfort can be improved, energy consumption and carbon emissions can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0024] Figure 2 It is a side view of the present application.

[0025] Figure 3 It is a schematic diagram of the structure of the four-around wall of the present application.

[0026] Figure 4 It is a construction flowchart of the present application.

[0027] In the drawings:

[0028] 1-Local reinforcing steel bars; 2-Vertical steel bars; 3-Horizontal steel bars; 4-Phase change material packaging box; 5-Precast formwork; 6-Connecting steel bars. DETAILED DESCRIPTION

[0029] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0030] Please refer to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application. Figures 1-3 The present application provides an assembled phase change composite wall, comprising a wall body and an assembled connecting piece; the wall body is formed by pouring concrete, and a steel bar skeleton is poured inside; the steel bar skeleton is formed by binding and fixing vertical steel bars 2 and horizontal steel bars 3. The vertical steel bars 2 and the horizontal steel bars 3 are longitudinally and transversely interlaced to form a steel bar mesh, and the steel bar skeleton comprises two layers of steel bar meshes.

[0031] In order to improve the mechanical and deformation properties of the assembled wall, the wall body is provided with a concealed pile made of reinforced concrete on both sides; a plurality of vertical steel bars 2 on both sides of the steel bar skeleton inside the concealed pile are horizontally bound by local reinforcing steel bars 1; the local reinforcing steel bars 1 are longitudinally arranged on the vertical steel bars 2, and the concealed pile is formed by pouring concrete and integrally poured with the wall body, so that the mechanical properties of the wall body are better.

[0032] In the present application, the thickness of the wall is set as B, 150mm≤B≤400mm.

[0033] The assembled connecting piece comprises a steel sleeve; the steel sleeve is arranged on the upper end of the intermediate part of the steel bar skeleton, the opening is upward, and the lower end is fixedly connected with the upper end of the vertical steel bar 2; the lower end of the vertical steel bar 2 of the intermediate part of the steel bar skeleton extends downward to protrude from the wall body; the steel sleeve is fixedly poured in the inside of the wall body, and the upper end opening faces the outside of the wall; a reserved hole is formed by reserving the upper opening of the steel sleeve during pouring of the wall, and the connection between the upper and lower walls is realized through the reserved hole; during assembly of the wall, the steel sleeve on the upper wall is connected with the vertical steel bar on the lower wall of another wall, or is connected with the vertical steel bar of other walls or a base.

[0034] A plurality of phase change material packaging boxes 4 are arranged between the two layers of steel bar meshes in the horizontal direction; the phase change material packaging boxes 4 are arranged below the steel sleeve; the phase change material packaging boxes 4 are packaged with phase change materials inside, which are used to improve the mechanical properties of the wall and play a role in heat preservation and heat insulation. A connecting steel bar 6 is further arranged in the middle of the two layers of steel bar meshes, which is used to support the two layers of steel bar meshes, so that the steel bar skeleton structure is more stable, and the phase change material packaging boxes 4 are fixed and limited.

[0035] The phase change material packaging box 4 is arranged as a thin-walled container and is made of a flexible hard material, such as polypropylene material; the phase change material packaging box 4 is provided with a filling hole at one end, which is used for filling the phase change material. Before filling, the phase change material needs to be preheated to make it fully liquefied; the filling environment temperature needs to be above the phase change temperature of the phase change material to ensure that solidification does not occur during the filling process. After the filling is completed, the filling hole is sealed.

[0036] In order to ensure that the phase change material can be safely and uniformly filled in the container and effectively isolated from the external environment, the application adopts a heating packaging process. In this process, first, the polypropylene thin-walled container is preheated by a temperature-controllable heater to eliminate possible micro-stresses inside the container and improve its combination tightness with the phase change material. Then, under strict temperature control, the preheated and liquefied phase change material is injected into the semi-closed container at a slow and stable speed, taking advantage of the fluidity of the phase change material in the liquid state to ensure its uniform distribution in the container without dead angles. When the phase change material is completely filled and slightly cooled to near its freezing point, the semi-closed container opening is quickly and accurately heated and sealed.

[0037] In one embodiment of the application, the phase change material packaging box 4 is a thin-walled container made of polypropylene, with a wall thickness of 0.5 to 3 mm. The selection of the polypropylene container mainly has the following three aspects: on the one hand, the wall thickness is relatively thin, which can ensure the smooth heat absorption and heat release of the internal phase change material during phase transition, and will not be affected by energy loss due to excessive wall thickness; on the other hand, the polypropylene thin-walled container has a certain toughness, which can ensure that it will not be extruded and deformed during concrete pouring, causing the risk of internal phase change material leakage; thirdly, polypropylene has a relatively small density, a relatively light weight, and a relatively low cost, and is more suitable.

[0038] The phase change material is selected from materials such as n-octadecane and n-hexadecane, with a phase change temperature range of 20-35℃. In the application, paraffin is selected as the phase change material.

[0039] The size of the phase change material packaging box arranged in the prefabricated wall can be determined by actual conditions, and the width D is less than the thickness of the wall. In one embodiment of the application, D occupies 1 / 6 to 1 / 2 of the thickness B of the wall, and the larger the size, the better the heat storage effect of the wall.

[0040] The concrete in the application selects general concrete, such as ordinary concrete, lightweight aggregate concrete, foam concrete, recycled concrete, geopolymer concrete, self-compacting concrete, and fiber cement-based composite materials.

[0041] The assembled phase change composite wall of the application can be set as a one-piece type, and can also be directly poured as a four-around type wall, the hidden pile is arranged at the four corners and the center position of the longer side of the four-around type wall, the upper end of the remaining wall part is provided with the steel sleeve, and the vertical steel bars 2 extend downward, and during wall construction, the vertical steel bars 2 are fixed by being butted with the steel sleeve.

[0042] Please refer to the accompanying drawings Figure 4 The construction method of the assembled phase change composite wall adopts a lying down form for wall prefabrication, and comprises the following steps:

[0043] S1: The prefabrication formwork 5 is arranged according to the prefabrication size of the wall; the prefabrication formwork 5 is selected as a metal formwork, so that the manufacturing accuracy of the prefabricated component can be improved; and through holes for supporting the steel sleeve and the vertical steel bars 2 are formed on both sides of the prefabrication formwork 5;

[0044] S2: The lower layer of steel mesh is laid in the prefabrication formwork 5, and the vertical steel bars 2 and the horizontal steel bars 3 are longitudinally and transversely intersected and bundled; the connecting steel bars 6 and the vertical steel bars 2 of the upper layer of steel mesh are arranged above the lower layer of steel mesh, one end of the vertical steel bars 2 in the middle position of the wall body is penetrated through the prefabrication formwork 5, the other end is connected with the sleeve of the connecting steel bars 6, and the steel sleeve is penetrated through the prefabrication formwork 5; the two rows of vertical steel bars 2 on both sides of the wall body are bundled to form the keel of the hidden pile through the local reinforcing steel bars 1;

[0045] S3: The preliminary pouring of concrete is performed in the prefabrication formwork 5, the height of the poured concrete is (B-D) / 2, and the preliminary hardening of the concrete is waited;

[0046] S4: After the initial pouring and hardening, a plurality of phase change material packaging boxes 4 filled with phase change materials are uniformly arranged on the concrete, and the phase change material packaging boxes 4 are fixed and limited by the connecting steel bars 6;

[0047] S5: The horizontal steel bars 3 of the upper layer of steel mesh are arranged and fixed with the bottom part, so that the phase change material packaging boxes 4 are limited between the two layers of steel mesh;

[0048] S6: The remaining concrete is poured, and after the pouring is completed, maintenance is carried out, and after the maintenance is completed, demolding is carried out.

[0049] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0050] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An assembled phase change composite wall, characterized in that: The invention comprises a wall body and an assembled connecting piece; a steel keel is cast inside the wall body, and the steel keel is formed by binding and fixing vertical steel bars (2) and horizontal steel bars (3); the vertical steel bars (2) and the horizontal steel bars (3) are crisscrossed to form a steel mesh, and the steel mesh is provided with two layers; the assembled connecting piece is used to connect two walls during installation; a plurality of phase change material packaging boxes (4) are provided in the horizontal direction between the two layers of the steel mesh, and the phase change material is filled inside to improve the mechanical properties of the wall and play a role in thermal insulation; A connecting steel bar (6) is provided between the two layers of steel mesh, for supporting the two layers of steel mesh and fixing the position-limiting phase change material packaging box (4); The phase change material packaging box (4) is configured as a thin-walled container and is made of a tough hard material; a filling hole is provided at one end of the phase change material packaging box (4) for filling the phase change material; The tough hard material is polypropylene, and the wall thickness of the phase change material packaging box (4) is 0.5 to 3 mm; the width D of the phase change material packaging box (4) occupies 1 / 6 to 1 / 2 of the wall thickness B.

2. The assembled phase change composite wall according to claim 1, characterized in that: Concealed piles are provided on both sides of the wall body; a plurality of vertical steel bars (2) on both sides of the steel keel inside the concealed piles are horizontally bundled around the periphery through local reinforcement steel bars (1); a plurality of local reinforcement steel bars (1) are longitudinally provided along the vertical steel bars (2).

3. The assembled phase change composite wall according to claim 1, characterized in that: The assembled connector comprises a steel bar sleeve; the steel bar sleeve is arranged at the upper end of the middle part of the steel bar keel, with an opening facing upward and a lower end fixedly connected to the upper end of the vertical steel bar (2); the lower end of the vertical steel bar (2) in the middle part of the steel bar keel extends downward and protrudes from the wall body.

4. The assembled phase change composite wall according to claim 3, characterized in that: The steel sleeve is cast and fixed inside the wall body. When the wall is cast, an opening is reserved above the steel sleeve to form a reserved hole, and the connection between the upper and lower walls is achieved through the reserved hole.

5. The assembled phase change composite wall according to claim 3, characterized in that: The phase change material packaging box (4) is arranged below the steel bar sleeve; the phase change material packaging box (4) contains phase change material.

6. The assembled phase change composite wall according to claim 4, characterized in that: The phase change material is n-octadecane or n-hexadecane, and the phase change temperature range is 20-35°C.

7. The construction method of the assembled phase change composite wall according to any one of claims 1 to 6, characterized in that: The steps include: S1: setting a prefabricated template (5) according to the prefabricated size of the wall; and opening through holes on both sides of the prefabricated template (5) for supporting the steel sleeve and the vertical steel bars (2); S2: First, a lower layer of steel mesh is laid inside the prefabricated formwork (5), and the vertical steel bars (2) and the horizontal steel bars (3) are bundled in a crisscross pattern; then, connecting steel bars (6) and the vertical steel bars (2) of the upper layer of steel mesh are arranged above the lower layer of steel mesh, and one end of the vertical steel bar (2) in the middle of the wall body is passed through the prefabricated formwork (5), and the other end is connected to the steel bar (6) sleeve, and the steel bar sleeve is passed through the prefabricated formwork (5); the two rows of vertical steel bars (2) on both sides of the wall body are bundled through the local reinforcement steel bars (1) to form the keel of the hidden pile; S3: Preliminary pouring of concrete into the prefabricated formwork (5) with a concrete pouring height of (BD) / 2, and waiting for the concrete to initially harden; the thickness of the phase change material packaging box (4) is D, and the thickness of the wall is B; S4: After the initial pouring and hardening, a plurality of phase change material packaging boxes (4) filled with phase change material are evenly arranged on the concrete, and the phase change material packaging boxes (4) are fixed in position by connecting steel bars (6); S5: arranging the transverse steel bars (3) of the upper steel mesh and tying and fixing them to the bottom portion so that the phase change material packaging box (4) is confined between the two steel mesh layers; S6: Pour the remaining concrete, carry out curing after pouring is completed, and demould after curing is completed.

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