Assembled internal and external non-dismantling formwork heat preservation wall structure and construction method thereof

Abstract

The application discloses an assembled inner-outer non-dismantling formwork heat preservation wall structure and a construction method thereof, which comprises a thin-wall type steel formwork, a heat preservation formwork, a single-layer steel mesh, an anchoring piece and a limiting piece; the thin-wall type steel formwork comprises a type steel keel, and a steel reinforcing mesh is fixed to one side wall of a plurality of type steel keels; the heat preservation formwork is arranged at intervals from the thin-wall type steel formwork and forms a cavity for pouring wall body concrete; a plurality of through holes are formed in the plate surface of the heat preservation formwork; the single-layer steel mesh is fixed in the cavity; the anchoring piece penetrates through the through holes and anchors the heat preservation formwork and the wall body into an integral whole; and the limiting piece is arranged in the cavity and used for clamping the single-layer steel mesh. Through the application, the wall body formwork and the stress reinforcement are prefabricated in a factory, and the concrete is poured after on-site installation; the type steel keel and the single-layer steel mesh are used as the stress reinforcement in the wall body; and the combined action of the limiting piece and the anchoring piece can guarantee that the thickness of the wall body meets the design requirement, improves the pouring accuracy of the wall body and achieves the effect of the non-dismantling formwork.

Description

Technical Field

[0001] This invention relates to the field of building wall construction technology, and more specifically to a prefabricated internal and external formwork-free insulated wall structure and its construction method. Background Technology

[0002] With increasing awareness of energy conservation and environmental protection, and the improvement of people's living standards, more and more building walls need to have thermal insulation functions. Insulated walls are needed not only in cold regions, but also in humid southern regions.

[0003] Existing insulated walls are usually constructed by bonding composite insulation templates to the outside of the wall after the wall is poured, or by setting up the wall as an inner and outer wall and then placing insulation templates in the interlayer between the inner and outer walls. This greatly increases the thickness of the wall and increases material waste.

[0004] The internal insulation wall disclosed in the invention patent application (publication number CN101525913A, publication date 2009.09.09) includes a base wall, an air layer, an adhesive, and a composite insulation board. The composite insulation board is connected to the base wall by the adhesive, and there is an air layer between the base wall and the composite insulation board. During installation, the base wall is leveled and the elevation is determined. The composite insulation board is cut according to the on-site dimensions and then pasted onto the base wall with gypsum adhesive.

[0005] For example, the thermal insulation wall disclosed in the invention patent (authorization announcement number CN104110078B, authorization announcement date 2016.05.04) includes an inner wall, an outer wall, an insulation layer, and tie rods. The inner and outer walls are symmetrically arranged, and an insulation layer is set between the inner and outer walls. Tie rods are set through the insulation layer between the inner and outer walls. Since the insulation layer is set in the middle of the wall, the insulation layer is protected and avoids damage. In addition, the tie rods set between the inner and outer walls ensure the strength of the entire wall.

[0006] Whether bonding insulation boards to the outside of the wall or installing an insulation layer between the inner and outer walls, the wall must be poured first, or connecting bars must be installed to connect the wall and the insulation layer. Both of these methods involve constructing the insulation layer after the wall has been in place. Over time, the insulation layer is prone to falling off. Furthermore, both methods require a significant amount of manpower and resources on-site, resulting in high material consumption. The wall formwork cannot be removed until the concrete reaches the required strength, leading to long waiting times and severely impacting the construction schedule.

[0007] Therefore, how to provide a formwork-free insulated wall structure and its construction method that integrates the insulation layer, wall template, and wall into one piece, ensuring a tight bond between the insulation layer and the wall without cavities and achieving the same lifespan for both the insulation layer and the wall structure, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a prefabricated internal and external formwork-free insulated wall structure and its construction method, aiming to solve the above-mentioned technical problems.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A prefabricated, internal and external formwork-free insulated wall structure, comprising:

[0011] Thin-walled steel formwork, the thin-walled steel formwork includes multiple parallel and spaced steel keels, and one side wall of multiple steel keels is fixed with a steel expansion mesh;

[0012] The thermal insulation template is arranged at intervals with the thin-walled steel template to form a cavity for the concrete to be poured into the wall; the surface of the thermal insulation template has multiple through holes.

[0013] A single-layer steel mesh, which is composed of vertical and horizontal steel bars, is fixed in the cavity;

[0014] An anchor, which passes through the through hole and extends into the cavity, is used to anchor the thermal insulation template to the wall as a whole; the middle part of the anchor can be fixed to the vertical steel bar, and the end of the anchor can be fixed to the steel keel;

[0015] The limiting component has multiple slots, and is fixed in the cavity and engaged with the single-layer steel mesh through the multiple semi-circular slots.

[0016] The beneficial effects of the above technical solution are as follows: Traditional wall reinforcement mostly uses double-layer steel mesh, while this application uses a combination of steel keel and single-layer steel mesh as the wall reinforcement, reducing the number of steel meshes in the wall; at the same time, the steel keel, as the keel skeleton of the thin-walled steel formwork, can control the verticality and flatness of the wall; the insulation formwork can be used as an insulation layer and also as a formwork support for the wall; the anchors can anchor the insulation formwork in the wall, making the insulation formwork and the wall cast as a whole, preventing the insulation formwork from falling off later; the limiting component can prevent the single-layer steel mesh from shaking back and forth during concrete pouring, thus affecting the thickness of the steel reinforcement protective layer of the wall; the combined effect of the limiting component and the anchors can ensure that the wall thickness meets the design requirements and improve the accuracy of wall pouring.

[0017] Preferably, in the above-mentioned prefabricated internal and external non-removable formwork insulated wall structure, the limiting member includes a horizontal block and a vertical plate. The top surface of the horizontal block has a horizontal steel bar slot for engaging with the horizontal steel bar, and the bottom surface of the horizontal block has a vertical steel bar slot for engaging with the vertical steel bar. One end of the horizontal block is tightly fitted to the surface of the insulated formwork. The bottom end of the vertical plate and the other end of the horizontal block are integrally formed into an L-shape. The top of the vertical plate is fixed to the side wall of the steel keel away from the steel expansion mesh by bolts. The limiting member can rotate 90° around the bolts. Based on the required thickness of the concrete cover for the wall reinforcement, the location of the limiting component slots is selected to precisely control the thickness of the cover. During installation, the horizontal reinforcement slots of the limiting components hold the horizontal reinforcement. When reinforcement misalignment or installation position errors occur, the limiting components are rotated 90°, at which point the vertical reinforcement slots can hold the vertical reinforcement. The limiting components prevent single-layer reinforcement from swinging back and forth, thus ensuring the reinforcement effect is achieved and controlling the thickness of the concrete cover for the wall reinforcement. The contact between the two ends of the limiting components and the thin-walled steel formwork and insulation formwork ensures that the wall width meets the design requirements.

[0018] Preferably, in the above-mentioned prefabricated internal and external formwork-free insulated wall structure, both the horizontal and vertical rebar slots are semi-circular slots. The radius of the horizontal rebar slot is the same as the radius of the horizontal rebar, and the radius of the vertical rebar slot opening is the same as the radius of the vertical rebar. The semi-circular slots are adapted to the radius of the rebar, and can hold the single-layer rebar mesh in place, preventing the single-layer rebar mesh from swinging back and forth due to the impact of concrete or the vibration of the vibrator during concrete pouring, thus affecting the qualification rate of the wall rebar protective layer.

[0019] Preferably, in the above-mentioned prefabricated internal and external non-removable formwork insulated wall structure, the insulated formwork is a composite insulated formwork made entirely in the factory using Class A and Class B insulation materials, or an insulated formwork prefabricated entirely in the factory using double-layer Class B insulation materials. When Class A and Class B insulation materials are used, the surface of the board made of Class B insulation material faces the thin-walled steel formwork. Class B insulation material, due to the addition of EPS or XPS flame retardants, can improve the heat insulation and fire resistance performance of the insulated formwork. Class B insulation material is in direct contact with the wall and mainly plays a role in heat insulation and fire prevention. Class A insulation materials include inorganic active wall insulation materials, foamed cement insulation materials, vitrified microsphere insulation mortar, rock wool boards, and foamed ceramic insulation materials, etc. Due to their low density, low thermal conductivity, high compressive strength, convenient construction, and economic durability, they mainly play a role in bearing pressure. The combined use of Class A and Class B insulation materials can improve the insulation and load-bearing capacity of the wall; when two layers of Class B insulation materials are used, the insulation and fire resistance of the wall are greatly improved.

[0020] Preferably, in the above-mentioned prefabricated internal and external formwork-free thermal insulation wall structure, the anchoring components include an anchoring circular plate and an anchoring bar. The anchoring circular plate is disposed on the surface of the Class A thermal insulation formwork away from the thin-walled steel formwork. One end of the anchoring bar is fixed to the middle of the surface of the anchoring circular plate. The anchoring bar passes through a through hole in the thermal insulation formwork and is placed in the cavity. The other end of the anchoring bar is welded to the steel keel. The middle part of the anchoring bar is tied or welded to the single-layer steel mesh. By opening a through hole in the surface of the thermal insulation formwork, the anchoring bar enters the cavity formed by the thermal insulation formwork and the thin-walled steel formwork from the outside of the thermal insulation formwork through the through hole. The anchoring circular plate is tightly fitted to the surface of the thermal insulation formwork, and the anchoring bar is fixed to the vertical steel bars, which can tighten the thermal insulation formwork and the single-layer steel mesh, ensuring the smoothness of the thermal insulation formwork surface during the pouring process.

[0021] Preferably, in the above-mentioned prefabricated internal and external formwork-free insulated wall structure, since the anchors penetrate the insulation formwork, the insulation formwork and the wall are connected as a whole after the concrete is poured. This avoids the need to remove the wall formwork after the wall is poured. Furthermore, the wall insulation layer is poured integrally with the wall, eliminating the need for further insulation layer construction after the wall construction is completed. This reduces the complexity of the construction process and improves construction efficiency. To ensure the durability of the insulation formwork, a decorative material layer is applied to the surface of the insulation formwork after the concrete is poured.

[0022] Preferably, in the above-mentioned prefabricated internal and external formwork-free thermal insulation wall structure, the expanded steel mesh includes a square frame with multiple supporting ribs fixed inside, and a mesh fixed to the outer perimeter of the square frame; the mesh opening is a dense steel wire mesh with a diameter of 3mm to 5mm. Adding supporting ribs to the mesh improves its compressive strength. During concrete pouring, the pouring process can be observed through the expanded steel mesh, achieving a visual pouring operation and preventing voids and honeycomb-like pitting within the wall. After the wall construction is completed, a mortar surface layer needs to be applied. The expanded steel mesh improves the adhesion between the mortar and the wall, ensuring the mortar does not detach and extending the wall's service life. The expanded steel mesh can also be used as reinforcement for the mortar surface layer, increasing its strength.

[0023] Preferably, in the above-mentioned prefabricated internal and external formwork-free insulated wall structure, the steel keel is 20#, 25#, or 30# square steel. The square steel can be used as reinforcement or as the formwork skeleton for thin-walled steel formwork. The expanded steel mesh and the steel keel can be used as side formwork for the wall. After the concrete is poured, the steel keel and the wall concrete are cast as a whole, eliminating the need to remove the thin-walled steel formwork. The distance between the expanded steel mesh and the insulation formwork is the wall thickness. During the construction of the composite floor slab, the steel keel can be anchored to the pre-reserved reinforcement of the composite floor slab, allowing the wall and the leveling layer of the composite floor slab to be poured simultaneously, thus shortening the overall construction time of the house.

[0024] Preferably, in the above-mentioned prefabricated internal and external formwork insulated wall structure, the vertical reinforcing bars and the horizontal reinforcing bars are threaded steel bars or round steel bars.

[0025] This invention also provides a construction method for a prefabricated, internal and external formwork-free insulated wall structure. The method utilizes the prefabricated, formwork-free insulated wall structure described above for wall construction, and includes the following steps:

[0026] S1. Single-layer steel mesh is prefabricated in the factory;

[0027] S2. Based on the dimensions and shape of the wall structure, fabricate the various components of the wall formwork, assemble the thin-walled steel formwork and insulation formwork in the factory or on site, and install single-layer steel mesh, anchors and limiting components at the same time; Note that when making the formwork, according to the building structure, reserve holes in the thin-walled steel formwork and insulation formwork for the subsequent installation of doors and windows;

[0028] S3. Transport the assembled wall formwork to the construction site for installation. During installation, weld or tie the single-layer steel mesh to the reserved reinforcement of the ring beam. At the same time, embed electrical conduits in the cavity of the concrete to be poured.

[0029] S4. After the wall concrete has been inspected and approved by professional technical and quality personnel, it shall be poured.

[0030] Preferably, in the above-mentioned prefabricated internal and external formwork-free insulated wall structure, the wall concrete is plain concrete or lightweight concrete. This reduces the wall's self-weight without compromising its thermal insulation performance.

[0031] The beneficial effects of the above technical solution are as follows: thin-walled steel formwork and insulation formwork are used as formwork on both sides of the wall; the insulation formwork is anchored to the wall to form an integral structure using anchors; limiting components are used to support the steel keel and insulation formwork and to hold the single layer of steel mesh in place to ensure the thickness of the wall pouring; after the concrete is poured, the steel keel is poured into the wall concrete without the need to remove the thin-walled steel formwork; at the same time, the insulation layer of the wall is poured together with the wall, avoiding the drawbacks of secondary bonding of the insulation layer, maintaining a tight fit between the material and the wall, and resulting in better insulation performance.

[0032] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a prefabricated internal and external formwork-free thermal insulation wall structure and its construction method. The wall formwork and wall reinforcement are prefabricated in the factory, and concrete is poured after on-site installation, realizing the prefabricated construction of the wall, while eliminating the need to remove the wall formwork.

[0033] The traditional double-row steel reinforcement in the wall is replaced by a single-layer steel mesh and steel framing. Utilizing the flatness and verticality of the steel framing, the expanded steel mesh is fixed to the steel framing using a pneumatic nail gun, serving as one side formwork for the wall. The insulation formwork serves as the other side formwork. Anchors and limiting devices secure the thin-walled steel formwork and the insulation formwork on both sides of the wall, as well as the single-layer steel mesh within the wall. The thin-walled steel formwork, the insulation formwork, and the wall are cast as a single unit. After concrete pouring, the insulation wall can be formed in one go without demolding, ensuring no gaps between the insulation layer and the wall, thus preventing wall cracking.

[0034] The insulation layer is integrally formed with the wall structure layer, avoiding the drawbacks of separately bonding the insulation layer, improving construction progress, reducing the labor intensity of construction workers, and reducing material waste. During the wall pouring process, the expansion mesh of steel bars achieves a visual pouring effect, allowing for a clear understanding of the pouring effect and timely adjustments to improve the pouring quality of the wall and avoid the occurrence of voids and honeycomb surface defects. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 A schematic diagram of the wall template structure provided by the present invention;

[0037] Figure 2 This is a schematic diagram of the limiting component structure provided by the present invention;

[0038] Figure 3 This is a schematic diagram of the installation of the limiting component provided by the present invention;

[0039] Figure 4 This is a top view of the thin-walled steel formwork provided by the present invention;

[0040] Figure 5 A schematic diagram of the expanded steel mesh structure provided by the present invention;

[0041] Figure 6 This is a schematic diagram of the anchor structure provided by the present invention;

[0042] Figure 7 This is a cross-sectional view of the completed wall casting provided by the present invention.

[0043] in:

[0044] 1-Thin-walled steel formwork; 11-Steel keel; 12-Extended steel mesh; 121-Supporting reinforcement; 122-Mesh; 123-Square frame;

[0045] 2-Insulation template;

[0046] 3-Anchors;

[0047] 4-Vertical reinforcement bars;

[0048] 5-Limiting component; 51-Horizontal rebar slot; 52-Horizontal block; 53-Vertical plate; 54-Vertical rebar slot;

[0049] 6-Horizontal reinforcement bars;

[0050] 7- Bolt. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Example 1:

[0053] See appendix Figure 1 This invention discloses a prefabricated internal and external formwork-free thermal insulation wall structure, comprising:

[0054] Thin-walled steel formwork 1 includes multiple parallel and spaced steel keels 11, and one side wall of each steel keel 11 is fixed with a steel expansion mesh 12.

[0055] Insulation template 2 is arranged alternately with thin-walled steel template 1 to form a cavity for the concrete to be poured into the wall; multiple through holes are opened on the surface of the insulation template 2.

[0056] A single-layer steel mesh is composed of vertical steel bars 4 and horizontal steel bars 6, and the single-layer steel mesh is fixed in the cavity;

[0057] Anchor 3, which passes through the through hole and extends into the cavity, is used to anchor the thermal insulation template 2 to the wall as a whole; the middle part of the anchor 3 can be fixed to the vertical steel bar 4, and the end of the anchor 3 can be fixed to the steel keel 11.

[0058] The limiting component 5 has multiple slots and is fixed in the cavity and connected to the single-layer steel mesh.

[0059] See appendix Figure 2 and 3 The limiting component 5 includes a horizontal block 52 and a vertical plate 53. The top surface of the horizontal block 52 has a horizontal rebar slot 51 for holding horizontal rebars 6, and the bottom surface of the horizontal block 52 has a vertical rebar slot 54 for holding vertical rebars 4. One end of the horizontal block 52 abuts against the surface of the insulation template 2. The bottom end of the vertical plate 53 is integrally formed into an L-shape with the other end of the horizontal block 52. The top of the vertical plate 53 is fixed to the side wall of the steel keel 11 away from the rebar expansion mesh 12 by bolts 7. The limiting component 5 can rotate 90° around the bolts 7. Normally, the horizontal rebar slot holds the horizontal rebar. When the horizontal rebar is misaligned or there is an installation error, rotating the limiting component 90° rotates the vertical rebar slot, allowing it to hold the vertical rebar.

[0060] In this embodiment, the openings of both the horizontal rebar slot 51 and the vertical rebar slot 54 are semi-circular.

[0061] To further optimize the above technical solution, ensure the stability of the single-layer steel mesh, and prevent back-and-forth swaying during the pouring process, the radius of the horizontal steel bar slot 51 is the same as the radius of the horizontal steel bar 6; the radius of the vertical steel bar slot 54 is the same as the radius of the vertical steel bar 4.

[0062] See appendix Figure 1 and 6 The anchor 3 includes an anchoring circular plate 31 and an anchoring bar 32. The anchoring circular plate 31 is set on the plate surface of the insulation template 2 away from the thin-walled steel template 1. One end of the anchoring bar 32 is fixed to the middle of the plate surface of the anchoring circular plate 31. The anchoring bar 32 passes through the through hole on the insulation template 2 and is placed in the cavity. The other end of the anchoring bar 32 is welded to the steel keel 11. The middle part of the anchoring bar 32 is tied or welded to the single-layer steel mesh.

[0063] In this embodiment, the insulation template is a composite insulation template prefabricated in the factory using Class A and Class B insulation materials. The side using Class B insulation material is located on the side closer to the wall, while the side using Class A insulation material is located on the side farther from the wall. The Class B insulation material mainly serves for thermal insulation and fireproofing, while the Class A insulation material mainly serves for support. Anchoring circular plates 31 are located on the side using Class A insulation material, and anchoring bars 32 pass sequentially through the through holes on the sides using Class A and Class B insulation material, extending into the cavity of the concrete to be poured.

[0064] See appendix Figure 4 and 5 The expanded steel mesh 12 includes a square frame 123, within which multiple supporting ribs 121 are fixed. A mesh 122, with a mesh opening of 3mm to 5mm, is fixed to the outer perimeter of the square frame 123. By adding supporting ribs, the expanded steel mesh's ability to resist lateral concrete pressure is improved, ensuring a more complete and smoother, more aesthetically pleasing wall surface. Furthermore, during subsequent mortar layer construction, the expanded steel mesh enhances the bond between the mortar and the wall, and can also be used as reinforcement to increase the overall mechanical properties of the mortar layer.

[0065] The steel keel 11 is made of 20#, 25# or 30# square steel. It can be used as reinforcement for the wall, as a template skeleton for thin-walled steel formwork to fasten the steel expansion mesh, or as anchoring bar for the upper composite floor slab to anchor the upper composite floor slab to the wall. The steel keel is cast as a whole into the wall, achieving the effect of eliminating the need to remove the formwork.

[0066] To further optimize the above technical solution, the vertical reinforcing bars 4 and the horizontal reinforcing bars 6 are made of threaded steel or round steel. Depending on the needs, different materials are selected and welded into a single layer of reinforcing mesh in the factory to avoid on-site binding of the wall's load-bearing reinforcing bars, thus improving work efficiency.

[0067] Example 2:

[0068] See appendix Figure 7 This invention discloses a construction method for a prefabricated internal and external formwork-free insulated wall structure, using the formwork-free wall structure described in Example 1, and includes the following steps:

[0069] S1. Single-layer steel mesh is prefabricated in the factory;

[0070] S2. Based on the dimensions and shape of the wall structure, manufacture thin-walled steel formwork and insulation formwork in the factory, while reserving openings for subsequent installation of doors and windows. Assemble the thin-walled steel formwork and insulation formwork in the factory or on the construction site, and install single-layer steel mesh, anchors and limiting components.

[0071] S3. Transport the assembled wall formwork to the building construction site for installation. During installation, weld or tie the single-layer steel mesh to the reserved reinforcement of the ring beam. At the same time, embed electrical conduits in the cavity of the concrete to be poured.

[0072] S4. After the wall concrete has been inspected and approved by professional technical and quality personnel, it shall be poured.

[0073] Example 3:

[0074] This invention provides a method for building a house. The method uses the non-removable formwork wall in Example 1. After the formwork is installed in Example 2, the composite floor slab of the upper structure of the house is hoisted and the reserved reinforcing bars of the composite floor slab are welded and fixed to the steel keel. At this time, the walls of the house and the composite floor slab form a house body. Finally, the wall concrete and the upper leveling layer of the composite floor slab are poured.

[0075] The present invention provides a formwork-free insulated wall and its construction method, which adopts the concept of prefabricated construction. The insulated formwork and thin-walled steel formwork are cast integrally with the wall, avoiding the trouble of removing the wall formwork after casting. The insulated formwork and the wall are formed in one step, reducing the number of steps in constructing the insulation layer. Since the wall is constructed by factory prefabrication and on-site assembly, no professional technicians are required. Ordinary workers can complete the formwork installation and concrete pouring in a very short time.

[0076] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0077] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A prefabricated, internal and external formwork-free insulated wall structure, characterized in that, include: Thin-walled steel formwork (1), the thin-walled steel formwork (1) includes a plurality of parallel and spaced steel keels (11), and one side wall of the plurality of steel keels (11) is fixed with a steel expansion mesh (12); Insulation template (2), the insulation template (2) and the thin-walled steel template (1) are arranged at intervals to form a cavity for the concrete to be poured into the wall; multiple through holes are opened on the surface of the insulation template (2); A single-layer steel mesh, the single-layer steel mesh being composed of vertical steel bars (4) and horizontal steel bars (6), the single-layer steel mesh being fixed in the cavity; Anchor (3), the anchor (3) passes through the through hole and extends into the cavity, and is used to anchor the thermal insulation template (2) to the wall as a whole; the middle part of the anchor (3) can be fixed to the vertical steel bar (4), and the end of the anchor (3) can be fixed to the steel keel (11); The limiting member (5) has multiple semi-circular slots, and the limiting member (5) is fixed in the cavity and is engaged with the single-layer steel mesh through the multiple semi-circular slots. The limiting component (5) includes a horizontal block (52) and a vertical plate (53). The top surface of the horizontal block (52) is provided with a horizontal steel bar slot (51) that can be engaged with the horizontal steel bar (6). The bottom surface of the horizontal block (52) is provided with a vertical steel bar slot (54) that can be engaged with the vertical steel bar (4). One end of the horizontal block (52) abuts against the surface of the insulation template (2). The bottom end of the vertical plate (53) and the other end of the horizontal block (52) are integrally formed into an L-shape. The top of the vertical plate (53) is fixed to the side wall of the steel keel (11) away from the steel expansion mesh (12) by bolts (7). The limiting component (5) can rotate 90° around the bolts (7). The steel reinforcement mesh (12) is fixed to the steel keel (11) and used as one side formwork of the wall, and the thermal insulation template (2) is used as the other side formwork of the wall; The radius of the groove of the horizontal steel bar slot (51) is the same as the radius of the horizontal steel bar (6); the radius of the groove of the vertical steel bar slot (54) is the same as the radius of the vertical steel bar (4); The thermal insulation template (2) is a composite thermal insulation template made of Class A thermal insulation material and Class B thermal insulation material in the factory, or a thermal insulation template made of double-layer Class B thermal insulation material in the factory. The anchor (3) includes an anchoring circular plate (31) and an anchoring bar (32); the anchoring circular plate (31) is disposed on the plate surface of the insulation template (2) away from the thin-walled steel template (1), one end of the anchoring bar (32) is fixed to the middle of the plate surface of the anchoring circular plate (31), and the anchoring bar (32) passes through a through hole on the insulation template (2) and Placed in the cavity, the other end of the anchor bar (32) is welded to the steel keel (11), and the middle part of the anchor bar (32) is tied or welded to the single-layer steel mesh for fixation; The expanded steel mesh (12) includes a square frame (123), with multiple supporting ribs (121) fixed inside the square frame (123), and a mesh (122) fixed on the outer periphery of the square frame (123).

2. The prefabricated internal and external formwork-free insulated wall structure according to claim 1, characterized in that, The mesh (122) is a dense wire mesh with a mesh opening diameter of 3mm to 5mm.

3. The prefabricated internal and external formwork-free insulated wall structure according to claim 1, characterized in that, The steel keel (11) is 20#, 25# or 30# square steel.

4. The prefabricated internal and external formwork-free insulated wall structure according to claim 1, characterized in that, The vertical reinforcing bars (4) and the horizontal reinforcing bars (6) are threaded steel bars or round steel bars.

5. A construction method for a prefabricated internal and external formwork-free insulated wall structure, using the prefabricated internal and external formwork-free insulated wall structure as described in any one of claims 1 to 4, comprising the following steps: S1. Precast single-layer steel mesh; S2. Prefabricate wall formwork in the factory; S3. On-site installation of wall formwork; S4. Pour the concrete for the wall.

Images