Prefabricated hollow sandwich outer wall structure

Abstract

The utility model provides a prefabricated hollow sandwich outer wall structure which comprises an inner leaf wall plate, a heat preservation layer cavity, an outer leaf wall plate, limiting sleeves, connecting assemblies and supporting formworks, the inner leaf wall plate and the outer leaf wall plate are arranged in parallel, a plurality of positioning holes are formed in the inner leaf wall plate and the outer leaf wall plate, and the limiting sleeves are arranged between the corresponding positioning holes; the supporting formwork is tightly attached to a tray of the limiting sleeve, and the inner wallboard and the outer wallboard are supported to form a heat preservation layer cavity. The connecting assemblies penetrate through the corresponding positioning holes and the limiting sleeves in the inner wallboard and the outer wallboard to temporarily connect the inner wallboard and the outer wallboard into a whole; the heat preservation layer cavity is formed by pouring heat preservation layer slurry, and seamless connection among the inner wallboard, the heat preservation layer cavity and the outer wallboard is achieved. The process is simple, and the weight is lighter; the heat preservation layer is of a cavity structure, heat preservation layer slurry can be poured, the whole outer wall is free of through seams, the waterproof effect and the heat preservation effect are better, the connecting assemblies can be detached, and the outer wall is not prone to cracking.

Description

Technical Field

[0001] This application relates to the field of prefabricated building engineering technology, and in particular to a prefabricated hollow sandwich exterior wall structure. Background Technology

[0002] With the continuous development of the construction industry, prefabricated concrete buildings have gradually emerged and been rapidly promoted in China in recent years. Precast concrete components play an important role in the national economy. Compared with cast-in-place concrete, precast concrete components are safer, of higher quality, faster to install, and have lower production costs. Among them, the application of precast concrete sandwich insulation walls is becoming more and more widespread.

[0003] Precast sandwich insulated walls, also known as precast core walls, consist of an inner leaf wall, an insulation layer, and an outer leaf wall. The inner leaf wall is a reinforced concrete structure and serves as the load-bearing wall, while the outer leaf wall does not participate in structural load-bearing. The insulation layer is located between the inner and outer leaf walls, which are connected by insulation tie rods. The drawbacks of this structure are: 1. The insulation layer material has high compressibility, leading to uneven compression deformation during continuous pouring of the outer leaf wall concrete, resulting in poor forming accuracy; 2. The sandwich wall panels have continuous seams around the perimeter, making them prone to cracking and leakage; 3. The manufacturing process is complex, the material is heavy, and transportation and hoisting are inconvenient. Utility Model Content

[0004] In view of the shortcomings of the existing structures, this application provides a prefabricated hollow sandwich exterior wall structure to overcome the deficiencies of the existing structural form and production process.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] A prefabricated hollow sandwich exterior wall structure includes an inner leaf wall panel, an insulation layer cavity, an outer leaf wall panel, a limiting sleeve, a connecting component, and a supporting template. The inner and outer leaf wall panels are arranged parallel to each other, and each panel has multiple positioning holes, with a limiting sleeve positioned between corresponding positioning holes. The supporting template is tightly fitted to the tray of the limiting sleeve, supporting the inner and outer leaf wall panels to form the insulation layer cavity. The connecting component passes through the corresponding positioning holes and the limiting sleeve on the inner and outer leaf wall panels, temporarily connecting them as a single unit. The insulation layer cavity can be filled with insulation grout, achieving a seamless connection between the inner leaf wall panel, the insulation layer cavity, and the outer leaf wall panel.

[0007] In one possible embodiment, the limiting sleeve is a T-shaped hollow structure, including a tube body, a tray, and a central hole;

[0008] The tube extends from the inner side of the inner leaf wall panel, and the bottom of the tube is coplanar with the inner side of the inner leaf wall panel. The tray is in close contact with the support template, supporting and forming the insulation layer cavity.

[0009] In one possible embodiment, the connecting assembly includes: a temporary fixing bolt and an internal nut for the outer leaf wall panel;

[0010] The nut inside the outer leaf wall panel is located inside the outer leaf wall panel; the temporary fixing bolt passes through the limiting sleeve and is threadedly connected to the nut inside the outer leaf wall panel.

[0011] The temporary fixing bolts, the built-in nuts of the outer leaf wall panel, and the limiting sleeve are combined to fix the support template.

[0012] Furthermore, the temporary fixing bolt includes a nut, a screw, and a threaded section connected in sequence, wherein the nut is tightly attached to the bottom of the tube body of the limiting sleeve, the screw is inserted into the central hole of the limiting sleeve, and the threaded section is threadedly connected to the built-in nut of the outer leaf wall plate.

[0013] Furthermore, the nut built into the outer leaf wall panel has a groove structure. The nut built into the outer leaf wall panel includes: a nut body, a nut top vertically disposed at one end of the nut body, and a flange at the other end of the nut body. The inner surfaces of the nut body and the nut top both have threads corresponding to the threaded section of the temporary fixing bolt.

[0014] In one possible embodiment, it further includes: a thermal insulation tie member; the two ends of the thermal insulation tie member are respectively inserted into the inner leaf wall panel and the outer leaf wall panel, but do not penetrate the inner leaf wall panel and the outer leaf wall panel, thereby realizing the connection between the inner leaf wall panel, the thermal insulation cavity and the outer leaf wall panel.

[0015] In one possible embodiment, both the inner leaf wall panel and the outer leaf wall panel are made of concrete and are cast together with the insulation layer tie members and the built-in nuts of the outer leaf wall panel.

[0016] In one possible embodiment, the insulation layer cavity is formed by injecting insulation layer grout, thereby achieving a seamless connection between the inner leaf wall panel, the insulation layer cavity, and the outer leaf wall panel.

[0017] In one possible embodiment, the limiting sleeve and the temporary fixing bolt are an integral structure.

[0018] In one possible embodiment, the inner leaf wall panel includes: an inner leaf wall body, vertical main reinforcement bars of the wall body, wall stirrups, and a grouting sleeve connecting the vertical main reinforcement bars of the wall body.

[0019] The beneficial effects of the embodiments of this application are as follows:

[0020] This application provides a prefabricated hollow sandwich exterior wall structure, including an inner leaf wall panel, an insulation layer cavity, an outer leaf wall panel, a limiting sleeve, a connecting component, and a supporting template. The inner and outer leaf wall panels are arranged parallel to each other, and each panel has multiple positioning holes, with a limiting sleeve positioned between the corresponding positioning holes. The supporting template is tightly fitted to the tray of the limiting sleeve, supporting the inner and outer leaf wall panels to form the insulation layer cavity. The connecting component passes through the corresponding positioning holes and the limiting sleeve on the inner and outer leaf wall panels, temporarily connecting them as a single unit. The insulation layer cavity is formed by injecting insulation grout, achieving a seamless connection between the inner leaf wall panel, the insulation layer cavity, and the outer leaf wall panel. The insulation layer adopts a cavity structure, enabling the creation of insulated sandwich-style exterior walls. After the prefabricated cavity sandwich exterior wall is completed, the insulation layer cavity is filled with insulation grout, preventing deformation of the insulation layer and improving molding precision. This results in a smoother and more aesthetically pleasing overall appearance of the outer leaf wall panel. Furthermore, the continuous in-situ pouring of insulation grout into the insulation layer cavity ensures a seamless exterior wall surface, enhancing both waterproofing and insulation performance. Additionally, the connecting components temporarily connect the inner and outer leaf wall panels using limiting sleeves. After the insulation grout is poured into the cavity and the wall has cured, the connecting components are removed, reducing the likelihood of cracking in the exterior wall. Moreover, the parallel production of the inner and outer leaf wall panels reduces unnecessary reinforcement within the cavity, simplifying the process, reducing weight, and facilitating transportation and hoisting. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of a prefabricated hollow sandwich exterior wall structure provided in this application embodiment;

[0023] Figure 2 This is a schematic diagram of the limiting sleeve in this application;

[0024] Figure 3 This is a schematic diagram of the structure of the connecting component in this application.

[0025] Figure 4 For this application Figure 3 Schematic diagram of the temporary fixing bolt;

[0026] Figure 5 For this application Figure 3 Schematic diagram of the structure of the inner and outer leaf wall panels with built-in nuts;

[0027] Figure 6 For this application Figure 1 Schematic diagram of the inner leaf wall panel.

[0028] Reference numerals: 1-Inner leaf wall panel, 101-Inner leaf wall, 102-Vertical main reinforcement of wall, 103-Wall stirrup, 104-Grouting sleeve, 2-Insulation layer cavity, 3-Outer leaf wall panel, 4-Limiting sleeve, 401-Pipe body, 402-Tray, 403-Central hole, 5-Temporary fixing bolt, 501-Nut, 502-Threaded rod, 503-Threaded section, 6-Support template, 7-Inner nut of outer leaf wall panel, 701-Nut body, 702-Nut top, 703-Flange, 8-Insulation layer tie piece. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0031] Example 1:

[0032] This application provides a prefabricated hollow sandwich exterior wall structure, which can be found in the following embodiments. Figure 1 , Figure 1 The diagram shows a prefabricated hollow sandwich exterior wall structure according to an embodiment of this application, including: an inner leaf wall panel 1, an insulation layer cavity 2, an outer leaf wall panel 3, a limiting sleeve 4, a connecting component, and a supporting template 6. The inner leaf wall panel 1 and the outer leaf wall panel 3 are arranged parallel to each other, and each has multiple positioning holes, with a limiting sleeve 4 positioned between the corresponding positioning holes. The supporting template 6 is tightly attached to the tray of the limiting sleeve 4, supporting the inner leaf wall panel 1 and the outer leaf wall panel 3 to form the insulation layer cavity 2. The connecting component passes through the corresponding positioning holes on the inner leaf wall panel 1 and the outer leaf wall panel 3 and the limiting sleeve 4, temporarily connecting the inner leaf wall panel 1 and the outer leaf wall panel 3 into one unit. The insulation layer cavity 2 can be filled with insulation grout to achieve a seamless connection between the inner leaf wall panel 1, the insulation layer cavity 2, and the outer leaf wall panel 3.

[0033] In the embodiments of this application, the limiting sleeve 4 is a T-shaped hollow structure, including a tube body 401, a tray 402, and a central hole 403, as shown below. Figure 2 As shown.

[0034] Furthermore, the limiting sleeve can be made of engineering plastic. The tube body 401 extends from the inner side of the inner leaf wall panel 1, and the bottom of the tube body 401 is coplanar with the inner side of the inner leaf wall panel 1. The tray 402 is tightly attached to the support template 6, and together with the support template 6 and connecting components, it supports and forms the insulation layer cavity 2, which can fully ensure the stability and design accuracy of the hollow sandwich exterior wall structure and is permanently cast into the wall. In addition to limiting and supporting the tray 402, the tube body 401 also serves to protect the temporary fixing bolts 5, mainly to prevent the temporary fixing bolts 5 from being difficult to disassemble when cast together with the concrete. The central hole 403 ensures that the temporary fixing bolts 5 can pass through smoothly and is easy to disassemble and assemble. The tray 402 supports the support template 6 to ensure that the insulation layer cavity 2 is formed when the inner leaf wall panel 1 and the outer leaf wall panel 3 are cast.

[0035] like Figure 3 , 4 As shown, the connecting components include: a temporary fixing bolt 5 and an inner nut 7 for the outer leaf wall panel. The inner nut 7 for the outer leaf wall panel is located inside the outer leaf wall panel 3; the temporary fixing bolt 5 passes through the limiting sleeve 4 and is threadedly connected to the inner nut 7 for the outer leaf wall panel; the combination of the temporary fixing bolt 5, the inner nut 7 for the outer leaf wall panel, and the limiting sleeve 4 fixes and supports the template 6 to form the insulation layer cavity 2.

[0036] In the embodiments of this application, the temporary fixing bolt 5 includes a nut 501, a screw 502, and a threaded section 503 connected in sequence. The nut 501 is tightly fitted to the bottom of the tube body 401 of the limiting sleeve 4, the screw 502 is inserted into the central hole 403 of the limiting sleeve 4, and the threaded section 503 is threadedly connected to the built-in nut 7 of the outer leaf wall plate. Figure 3 As shown.

[0037] Furthermore, the temporary fixing bolt 5 is made of high-strength materials, such as metal and plastic, and has corresponding tensile and shear strength. Its function is to temporarily fix the two wall panels together with the built-in nut 7 of the outer leaf wall panel to form a hollow wall. When the prefabricated hollow sandwich wall construction is completed (the cavity of the insulation layer is filled with the insulation layer slurry and the wall is cured and formed), the temporary fixing bolt can be removed and reused.

[0038] like Figure 4 As shown, the inner nut 7 of the outer leaf wall panel has a groove structure. The inner nut (7) of the outer leaf wall panel includes: nut body 701, nut top 702 vertically set at one end of nut body 701, and flange 703 at the other end of nut body 701. The inner surfaces of nut body 701 and nut top 702 both have threads corresponding to the threaded section 503 of temporary fixing bolt 5.

[0039] Furthermore, the inner nut 7 of the outer leaf wall panel is made of high-strength material and is connected to the temporary fixing bolt 5 to temporarily fix the outer leaf wall panel 3. In addition, it prevents the mold from expanding when pouring the grout for the insulation layer. The inner nut 7 of the outer leaf wall panel and the outer leaf wall panel 3 can be cast as one piece and permanently embedded in the wall panel.

[0040] Furthermore, the limiting sleeve 4 and the temporary fixing bolt 5 can be an integral structure to improve the overall strength of the wall.

[0041] In the embodiments of this application, the prefabricated hollow sandwich exterior wall structure also includes an insulation tie member 8. The two ends of the insulation tie member 8 are respectively inserted into the inner leaf wall panel 1 and the outer leaf wall panel 3, but do not penetrate the inner leaf wall panel 1 and the outer leaf wall panel 3, thereby realizing the connection between the inner leaf wall panel 1, the insulation layer cavity 2 and the outer leaf wall panel 3.

[0042] Furthermore, the thermal insulation tie-off component is a prefabricated standard component made of high-strength materials with low thermal conductivity, such as engineering plastics or stainless steel.

[0043] like Figure 5 As shown, the inner leaf wall panel 1 includes: an inner leaf wall body 101, vertical main reinforcement bars 102, wall stirrups 103, and a grouting sleeve 104 connecting the vertical main reinforcement bars 102.

[0044] Example 2:

[0045] This application provides a construction process for a prefabricated hollow sandwich exterior wall structure, including the following steps:

[0046] 1) Preparation of inner leaf wall panel 1

[0047] Support wall side formwork;

[0048] Specifically, according to the design drawings, the side formwork of the wall panel is erected on a regular formwork platform to define the outer dimensions of the wall panel, i.e. the concrete pouring range. The side formwork is generally a steel formwork, which is magnetically fixed to the surface of the formwork platform.

[0049] Prepare the reinforcing steel system and connect the grouting sleeve;

[0050] Install the steel reinforcement system;

[0051] Positioning and installing 5 temporary fixing bolts;

[0052] Install limit sleeve 4;

[0053] Install insulation layer tie-down components 8;

[0054] Pour the inner leaf wall panel concrete to the design height;

[0055] 2) Install support template 6;

[0056] 3) Install the internal nuts 7 on the outer leaf wall;

[0057] 4) Lay the outer leaf steel mesh;

[0058] 5) Concrete pouring for the outer leaf wall panels;

[0059] 6) Curing and shaping;

[0060] 7) The prefabricated hollow sandwich exterior wall is completed;

[0061] 8) Hoist the structure into place on site and complete the structural connections;

[0062] 9) Insulate the cavity 2 of the insulation layer with insulation grout;

[0063] 10) Wall curing and shaping;

[0064] 11) Remove temporary fixing bolt 5; standard procedure;

[0065] 12) The central hole 403 of the sealing and limiting sleeve 4; conventional process;

[0066] 13) Finishing; standard process;

[0067] 14) Completed.

[0068] This application provides a prefabricated hollow sandwich exterior wall structure. The insulation layer adopts a cavity structure, enabling the fabrication of an insulated sandwich exterior wall. After the prefabricated hollow sandwich exterior wall is completed, insulation grout is poured into the cavity of the insulation layer, preventing deformation of the insulation layer and improving molding accuracy. This results in a smoother and more aesthetically pleasing outer leaf wall panel. Furthermore, the continuous in-situ pouring of insulation grout into the cavity of the insulation layer ensures a seamless exterior wall surface, improving both waterproofing and insulation performance. Additionally, the connecting components temporarily connect the inner and outer leaf wall panels together using limiting sleeves. After the insulation grout is poured into the cavity and the wall has cured, the connecting components are removed, reducing the likelihood of cracking in the exterior wall. Moreover, the parallel production of the inner and outer leaf wall panels reduces unnecessary reinforcement within the cavity, simplifying the process, reducing weight, and facilitating transportation and hoisting.

[0069] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. A prefabricated hollow sandwich facade structure, characterized in that, It includes: The inner leaf wallboard (1), the thermal insulation layer cavity (2), the outer leaf wallboard (3), the limiting sleeve (4), the connecting assembly, the support template (6), wherein the inner leaf wallboard (1) and the outer leaf wallboard (3) are arranged in parallel, and a plurality of positioning holes are arranged on the inner leaf wallboard (1) and the outer leaf wallboard (3), and a limiting sleeve (4) is arranged between the corresponding positioning holes; the support template (6) is tightly attached to the tray of the limiting sleeve (4), and the inner leaf wallboard (1) and the outer leaf wallboard (3) are supported to form a thermal insulation layer cavity (2); the connecting assembly passes through the corresponding positioning holes of the inner leaf wallboard (1) and the outer leaf wallboard (3) and the limiting sleeve (4), and temporarily connects the inner leaf wallboard (1) and the outer leaf wallboard (3) into one body; the thermal insulation layer cavity (2) is filled with thermal insulation layer slurry, and the inner leaf wallboard (1), the thermal insulation layer cavity (2) and the outer leaf wallboard (3) are connected without seam.

2. The precast hollow sandwich exterior wall structure according to claim 1, wherein, The limiting sleeve (4) is a T-shaped hollow structure, including a tube body (401), a tray (402) and a middle hole (403); The tube body (401) is extended from the inner side of the inner leaf wallboard (1), and the bottom of the tube body (401) is coplanar with the inner side of the inner leaf wallboard (1), and the tray (402) is tightly attached to the support template (6) to support the formation of the thermal insulation layer cavity (2).

3. The precast hollow sandwich exterior wall structure according to claim 1, wherein, The connecting assembly includes: temporary fixing bolts (5), outer leaf wallboard built-in nuts (7); The outer leaf wallboard built-in nut (7) is arranged in the outer leaf wallboard (3); the temporary fixing bolt (5) is threadedly connected with the outer leaf wallboard built-in nut (7) after passing through the limiting sleeve (4); The temporary fixing bolt (5), the outer leaf wallboard built-in nut (7) and the limiting sleeve (4) are combined to fix the support template (6).

4. The precast hollow sandwich exterior wall structure according to claim 3, wherein, The temporary fixing bolt (5) includes a nut (501), a screw rod (502) and a thread segment (503) connected in sequence, wherein the nut (501) is tightly attached to the bottom of the tube body (401) of the limiting sleeve (4), the screw rod (502) is inserted into the middle hole (403) of the limiting sleeve (4), and the thread segment (503) is threadedly connected with the outer leaf wallboard built-in nut (7).

5. The precast hollow sandwich exterior wall structure according to claim 3, wherein, The outer leaf wallboard built-in nut (7) is a groove structure, and the outer leaf wallboard built-in nut (7) includes: a nut body (701), a nut top (702) vertically arranged at one end of the nut body (701), and a flange (703) at the other end of the nut body (701), the nut body (701) and the inner cavity surface of the nut top (702) are provided with threads corresponding to the thread segment (503) of the temporary fixing bolt (5).

6. The precast hollow sandwich exterior wall structure according to claim 1, wherein, It also includes: Thermal insulation tie members (8); The two ends of the thermal insulation tie member (8) are respectively inserted into the inner leaf wallboard (1) and the outer leaf wallboard (3), but do not penetrate the inner leaf wallboard (1) and the outer leaf wallboard (3), so as to connect the inner leaf wallboard (1), the thermal insulation layer cavity (2) and the outer leaf wallboard (3).

7. The precast hollow sandwich exterior wall structure according to claim 6, wherein, It includes: The inner leaf wallboard (1) and the outer leaf wallboard (3) are both formed by pouring concrete, and are integrally poured with the inner thermal insulation layer pull tie (8) and the built-in nut (7) of the outer leaf wallboard.

8. The precast hollow sandwich exterior wall structure according to claim 2, wherein, The limiting sleeve (4) and the temporary fixing bolt (5) are of an integrated structure.

9. The precast hollow sandwich exterior wall structure according to claim 1, wherein, The inner leaf wallboard (1) comprises an inner leaf wall body (101), a wall body vertical main reinforcement (102), a wall body stirrup (103) and a grouting sleeve (104) connected with the wall body vertical main reinforcement (102).

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