Door cover structure, housing unit and method for installing door cover structure on housing unit

Abstract

The present invention discloses a door cover structure, a house unit and a method for installing the door cover structure on the house unit, and belongs to the technical field of bamboo winding house unit application. The door cover structure includes a first door cover, an inner frame, a second door cover and other components. The first door cover is formed by winding and bonding, and the forming is simple and the preparation cost is low. Moreover, by setting a base layer along the annular direction on the inner side of the first door cover, the inner frame installation environment can be effectively transformed from an "arc surface" to a "square frame surface", ensuring the stable installation of the inner frame and the second door cover, and then realizing the rapid installation of the door cover structure. The door cover structure in the present invention has a simple installation method on the house unit, can quickly realize the reliable installation and stable sealing of the door cover structure, simplifies the installation process of the door cover structure while ensuring the stability of the house unit structure, avoids damage to the house unit, prolongs the service life of the house unit, promotes the application of the house unit, and has good application prospects and promotion value.

Description

Technical Field

[0001] The invention belongs to the technical field of application of bamboo-wrapped house units, and in particular relates to a door cover structure, a house unit and a method for installing the door cover structure on the house unit. Background Art

[0002] Houses are essential items in people's lives, and they come in various forms and structures. With the continuous improvement of people's living standards and the continuous improvement of housing ecological and environmental protection requirements, traditional housing structures have become increasingly unable to meet people's actual needs.

[0003] Traditional house building structures mainly include brick-wood structures, brick-concrete structures, reinforced concrete structures and steel structures. Their raw materials are mostly non-renewable resources and have high energy consumption, are not environmentally friendly, have complicated construction procedures, long construction periods, low efficiency and high costs. Moreover, the construction waste after the demolition of traditional house building structures is inconvenient to handle, which has a great impact on the ecological environment and is not conducive to energy conservation, environmental protection and sustainable use of resources.

[0004] In view of this, in the prior patent application CN 2018103394713 of the present applicant, a multi-layer house unit, a preparation method thereof and a house containing the house unit are proposed, wherein the main structure of the house unit is obtained by using bamboo winding and bonding technology, and then a new type of house is obtained by setting a supporting structure and matching the house unit with the supporting structure. The house adopts a large amount of renewable materials for matching and preparation, and has environmental protection and energy saving properties that are unmatched by traditional house structures; at the same time, the multi-layer structure design of the house unit makes the house unit have good environmental protection performance and good structural performance, which has a very beneficial effect on reducing the cost of house construction and shortening the period of house construction, and has been increasingly applied. However, with the advancement of subsequent research and application, researchers found that due to the obvious difference between the wall structure of the housing unit and the traditional building wall, the door frame structure set on the traditional wall cannot fully adapt to the application on the bamboo wrapped housing unit. Forcible use will not only affect the stability and safety of the door frame structure after setting, but may also cause damage to the wall structure of the housing unit, causing unnecessary losses and affecting the normal use of the housing unit. Summary of the invention

[0005] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a door frame structure, a house unit and a method for installing the door frame structure on the house unit, wherein by providing a cylindrical structure composed of a first door frame, an inner frame, a second door frame and other structures in sequence, the installation of the door body can be effectively realized, which is suitable for the wall structure of the bamboo-wrapped house unit, reduces the damage to the wall structure during the installation of the door frame structure, and ensures the safety and sealing of the door frame structure.

[0006] To achieve the above object, the present invention provides a door cover structure, characterized in that it includes a first door cover, an inner frame and a second door cover which are sequentially arranged from the outside to the inside in the radial direction;

[0007] The first door frame is formed in the form of winding and bonding, and is generally a square frame structure, and its inner peripheral wall surface is an arc surface with a certain curvature in the circumferential direction;

[0008] The inner frame is arranged on the inner side of the first door frame and is a square frame structure. The width of the inner frame is smaller than the width of the first door frame, and both sides of the inner frame along the width direction do not protrude from both sides of the first door frame in the width direction.

[0009] A base layer is provided between the inner frame and the first door frame, the inner and outer side wall surfaces of the base layer respectively abut against the outer peripheral wall surface of the inner frame and the inner peripheral wall surface of the first door frame, and the two sides of the base layer along the width direction respectively protrude from the two sides of the inner frame;

[0010] The inner frame is provided with finishing layers on both sides along the width direction, namely a first finishing layer and a second finishing layer, respectively. The two finishing layers are respectively tightly arranged on the inner circumferential wall surface of the base layer, and the inner circumferential wall surfaces of the two finishing layers protrude from the inner circumferential wall surface of the inner frame respectively, and a receiving groove for accommodating the second door frame is formed between the two finishing layers, and then the second door frame is accommodated in the receiving groove, and the outer circumferential wall surface abuts against the inner circumferential wall surface of the inner frame.

[0011] As a further improvement of the present invention, the center line of the inner frame coincides with the center line of the first door frame, and the door frame structure is divided into an indoor part and an outdoor part with the center line of the inner frame as the boundary.

[0012] As a further improvement of the present invention, the first finishing layer is a cement finishing panel, which is arranged in the outdoor part; the second finishing layer is an interior decoration panel, which is arranged in the indoor part.

[0013] As a further improvement of the present invention, the base layer is provided with a step surface in a circumferential direction on its inner peripheral wall surface, so that one side of the inner frame in the width direction can be positioned corresponding to the step surface.

[0014] As a further improvement of the present invention, the two sides of the base layer along the width direction are flush with the two sides of the first door frame, and the first finishing layer and the second finishing layer respectively extend at the end corners of one side and correspondingly cover the two side surfaces of the first door frame and the base layer along the width direction.

[0015] As a further improvement of the present invention, the base layer is a blockboard.

[0016] Another aspect of the present invention provides a housing unit, wherein a door opening is provided on a wall of the housing unit, and the door frame structure is arranged in the door opening, wherein:

[0017] The door opening is opened corresponding to the first door frame, and its inner peripheral wall surface is an arc-shaped surface with a certain curvature in the circumferential direction. The door frame structure is correspondingly embedded in the door opening and then fixed.

[0018] As a further improvement of the present invention, a filling layer is filled between the outer peripheral wall surface of the first door frame and the inner peripheral wall surface of the door opening, and the filling layer is divided into a first filling layer and a second filling layer by the center line of the inner frame to correspond to the outer wall part and the inner wall part of the wall body respectively.

[0019] As a further improvement of the present invention, the first filler layer includes a foaming agent for filling the gap and a filling material for smoothing the seam opening; the second filler layer includes a glass fiber cloth for filling the gap and putty powder for trimming the seam opening edge.

[0020] As a further improvement of the present invention, the two ends of the first finishing layer and the second finishing layer that are opposite to each other extend on the outer peripheral wall surface of the door frame structure respectively, and extend to the wall surface abutting the wall body, that is, the two finishing layers respectively cover the two ends of the door frame structure along the width direction.

[0021] Another aspect of the present invention provides a method for installing a door frame structure on a housing unit, which is used to install the door frame structure on the housing unit, and is characterized in that it includes the following steps:

[0022] (1) Opening a door opening on the prepared housing unit;

[0023] (2) embedding and installing the first door frame into a corresponding position in the door opening, and providing a base layer in the first door frame along a circumferential direction;

[0024] (3) embedding the inner frame into the square frame structure enclosed by the base layer so that the outer peripheral wall surface of the inner frame abuts against the wall surface of the base layer;

[0025] (4) a first finishing layer and a second finishing layer are respectively provided on both sides of the inner frame in the transverse direction to form a receiving groove for receiving the second door frame;

[0026] (5) The second door frame is correspondingly embedded in the receiving groove to realize the installation of the door frame structure in the door opening.

[0027] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0028] In general, the above technical solution conceived by the present invention has the following beneficial effects compared with the prior art:

[0029] (1) The door cover structure of the present invention comprises a first door cover, an inner frame, a second door cover and other components. The first door cover is formed by winding and bonding, which is simple to form and has a low manufacturing cost. Moreover, by arranging a base layer along the circumferential direction on the inner side of the first door cover, the inner frame installation environment can be effectively transformed from an "arc surface" to a "square frame surface", thereby ensuring the stable installation of the inner frame and the second door cover and realizing the rapid installation of the door cover structure. At the same time, since the first door cover is formed by winding and bonding, its inner and outer wall surfaces are respectively arc surfaces with a certain curvature, which also requires that the door opening at its installation position be opened in the form of an inner wall surface with an arc surface. This opening method can effectively reduce stress concentration at the corners of the door opening, avoid damage to the house unit caused by the opening of the door opening, and extend the service life of the house unit.

[0030] (2) The door cover structure of the present invention, by respectively arranging the first finishing layer and the second finishing layer on both sides of the inner frame along the width direction, not only effectively realizes the formation of the receiving groove for accommodating and installing the second door cover, but also effectively improves the decorativeness of the door cover structure at both ends of the interior and the exterior, so that after the door cover structure is installed on the housing unit, no additional secondary decoration construction is required, the installation process of the door cover structure is simplified, the installation period of the door cover structure is shortened, and the decorativeness and waterproofness of the door cover structure are improved;

[0031] (3) The door frame structure of the present invention is provided with a step structure on the base layer on one side of the inner frame, so that the inner frame can be installed with the side wall surface abutting against the step surface, thereby achieving rapid positioning and reliable installation, and by extending the first finishing layer and the second finishing layer to cover both sides of the door frame structure in the width direction, the first door frame and the base layer are correspondingly covered, which can not only improve the decorative beauty of the door frame structure, but also further improve the sealing and waterproof properties of the door frame structure, thereby extending the service life of the door frame structure;

[0032] (4) The housing unit of the present invention has a door opening correspondingly opened on its wall, and a multi-layer assembled door frame structure is correspondingly arranged in the door opening. Since the outermost side of the door frame structure (i.e., the outer peripheral wall surface of the first door frame) is an arc surface along the circumferential direction, the inner peripheral wall surface of the door opening is also an arc surface when it is opened, which can effectively reduce the stress concentration at the corner when the door opening is cut and opened, avoid cracking and damage at the corner of the door opening due to stress concentration, and extend the service life of the housing unit; at the same time, when the door frame structure of the present invention is arranged on the housing unit, there is no need to set additional connectors or preset connectors, which can minimize the damage to the wall;

[0033] (5) The door frame structure of the present invention has a simple installation method on the house unit and convenient steps, and can quickly realize reliable installation and stable sealing of the door frame structure. While ensuring the stability of the house unit structure, it simplifies the installation process of the door frame structure, indirectly saves the use cost of the house unit, prolongs the service life of the house unit, and promotes the application of the house unit. It has good application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic cross-sectional view of the door frame structure in the first embodiment of the present invention;

[0035] Figure 2 is a schematic cross-sectional view of the door frame structure in the second embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of a door frame structure after being arranged on a housing unit in an embodiment of the present invention;

[0037] In all the drawings, the same figure marks represent the same technical features, specifically: 1. first door frame, 2. base layer, 3. inner frame, 4. second door frame, 5. first finishing layer, 6. second finishing layer, 7. wall, 8. first filling layer, 9. second filling layer, 10. sealing edge strip. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] Specifically, the door cover structure in the preferred embodiment of the present invention is as follows: Figures 1 to 3 As shown in , it can be installed on the wall to be used for the installation of the door structure. Figure 1 The structure of the door frame used for the inward opening of the door structure in the preferred embodiment 1 is shown in FIG. Figure 2The structure of the door frame used for the outward opening of the door structure in the preferred embodiment 2 is shown in the figure. The difference between the two is only that the door blocking protruding structure in the second door frame 4 is located close to the outdoor side or the indoor side.

[0044] Further, preferably, Figure 1 The door frame structure shown in FIG. 1 is specifically described.

[0045] Specifically, the door cover structure is set as follows Figure 3 As shown in , it can be regarded as a cylindrical structure with multiple layers in the thickness direction, and the cylindrical structure includes from the outside to the inside: a first door frame 1, a base layer 2, an inner frame 3 and a second door frame 4, and both can be regarded as a cylindrical structure arranged along the circumferential direction.

[0046] Furthermore, the first door frame 1 in the preferred embodiment is a composite cylindrical structure of multiple layers of winding and bonding, which includes an inner lining layer, a structural layer and an outer protective layer from the inside to the outside. Among them, the inner lining layer is preferably a single-layer or multi-layer structure formed by winding gauze, fiber felt or non-woven fabric, the structural layer is a multi-layer structure formed by winding and bonding bamboo strips, wood chips and other materials and having a certain thickness and strength, and the outer protective layer is formed by winding gauze, fiber felt or non-woven fabric with a certain thickness, and a certain thickness of waterproof coating, fire retardant coating or anti-corrosion coating is applied on the outermost side. Through the mutual bonding and curing molding between the above layers, a frame structure with a cross-section approximately rectangular is finally formed.

[0047] Furthermore, the inner frame 3 in the preferred embodiment is a square frame structure with each side perpendicular to each other, which is arranged on the inner side of the first door frame 1 and is used for installing the second door frame 4 and the door body. However, when the first door frame 1 is wound and bonded, due to stress concentration at the corners, each side and each corner of the first door frame 1 are curved surfaces with a certain curvature, rather than a regular square frame structure.

[0048] In view of this, if the inner frame 3 is directly installed or set on the inner side of the first door frame 1, there will inevitably be a certain gap between the outer peripheral wall surface of the inner frame 3 and the inner peripheral wall surface of the first door frame 1, so that the inner frame 3 cannot be stably set. Therefore, before the inner frame 3 is set, a base layer 2 of the inner frame 3 is set on the inner side of the first door frame 1, and its function is to realize the process of "arc to square", that is, to convert the wall surface corresponding to the outer peripheral wall surface of the inner frame 3 from an arc surface to a straight wall surface. Therefore, in the preferred embodiment, the side of the base layer 2 close to the inner peripheral wall surface of the first door frame 1 is an arc surface, which is in contact with the inner peripheral wall surface of the first door frame 1, and the side of the base layer 2 away from the inner peripheral wall surface of the first door frame 1 is a plane.

[0049] Further preferably, the base layer 2 is a blockboard in the embodiment, and it is preferably matched with the first door frame 1 in the form of bonding, and the two sides of the base layer 2 along the width direction are respectively flush with the two sides of the first door frame 1 along the width direction. Further, the inner frame 3 is arranged on the inner side of the base layer 2, and its outer peripheral wall surface abuts against the inner peripheral wall surface of the base layer 2, and the width of the inner frame 3 is smaller than the width of the first door frame 1 and the base layer 2, and the inner frame 3 is preferably located in the middle of the base layer 2 in the width direction, that is, the center line of the inner frame 3 is equidistant from the two sides of the first door frame 1 in the width direction.

[0050] Further preferably, in order to achieve reliable limiting and fixing of the inner frame 3, a convex structure is preferably provided on one side in the width direction of the inner frame 3, which is equivalent to providing a stepped structure on the inner peripheral wall surface of the base layer 2, so that the cross section of the base layer 2 is L-shaped. Such a configuration can effectively achieve rapid and accurate setting of the inner frame 3, so that one side wall surface of the inner frame 3 abuts against the stepped surface.

[0051] Furthermore, by setting the inner frame 3, the door frame structure can be divided into an outdoor part and an indoor part with the center line of the inner frame 3 as the boundary, such as Figure 1 as shown in .

[0052] Furthermore, a first finishing layer 5 is provided on the outer periphery of the door frame structure on one side of the inner sleeve 3 close to the outdoor part, and a second finishing layer 6 is provided on the outer periphery of the door frame structure on one side of the inner sleeve 3 close to the indoor part, such as Figure 1 As shown in . Further, the first facing layer 5 is preferably a cement facing panel, and the second facing layer 6 is preferably an interior panel. The side of the first facing layer 5 close to the inner frame 3 and the side of the second facing layer 6 close to the inner frame 3 are respectively flush with the two sides of the inner frame 3 along the width direction, and a receiving groove for receiving the second door cover 4 is formed between the ends of the first facing layer 5 and the second facing layer 6. Then, the second door cover 4 can be correspondingly received in the receiving groove, and the outer peripheral wall surface abuts against the inner peripheral wall surface of the inner frame 3, so as to realize the positioning and installation of the second door cover 4.

[0053] According to the different opening directions, Figure 1 or Figure 2 The second door frame 4 is installed in the form shown in . When the door frame structure is actually used, it is necessary to open a door hole of a certain size on the corresponding house wall. The opening size of the door hole is preferably equal to or slightly larger than the external size of the first door frame 1, and in actual setting, the center line of the inner frame 3 is preferably coincident with the center line of the wall 7, that is, the inner frame 3 and the second door frame 4 are arranged on the center line of the wall 7.

[0054] In a preferred embodiment, the door cover structure can be used to be arranged in Figure 3In the house unit shown in the figure, a door opening of corresponding size is correspondingly opened on the house unit. Since the inner peripheral wall surface of the door opening directly matches the first door frame 1, the sides and corners of the door opening in the preferred embodiment are respectively curved walls with a certain curvature to fully match the outer peripheral wall surface of the first door frame 1.

[0055] Furthermore, the first door frame 1, the base layer 2, the inner frame 3, the second door frame 4, the first finishing layer 5 and the second finishing layer 6 are sequentially arranged on the inner side of the door opening. After the door frame structure is arranged, in order to achieve the sealing between the first door frame 1 and the door opening, a packing layer is correspondingly arranged between the outer peripheral wall surface of the first door frame 1 and the door opening, which includes a first packing layer 8 arranged on the side close to the outdoors and a second packing layer 9 arranged on the side close to the indoors. In a preferred embodiment, the first packing layer 8 is composed of a foaming agent and a caulking material, and the second packing layer is composed of a glass fiber cloth and putty powder. The first packing layer 8 and the second packing layer 9 abut against each other at the center line position of the wall 7.

[0056] Furthermore, the method for installing the door frame structure on the housing unit in the preferred embodiment of the present invention preferably includes the following steps:

[0057] (1) Prepare the housing unit, and position and mark the housing unit after demoulding, so as to achieve the corresponding cutting of the installation part of the door cover structure, that is, the corresponding opening of the door opening;

[0058] (2) Install the first door frame 1 in the door opening so that the center line of the first door frame 1 is at a corresponding position, which is the center line of the wall 7 in a preferred embodiment, so that the two sides of the first door frame 1 are respectively the indoor part and the outdoor part with the center line of the wall 7 as the boundary;

[0059] (3) On the inner side of the first door frame 1, an inner frame 3 is coaxially arranged so that the center line of the inner frame 3 coincides with the center line of the wall 7, and a base layer 2 is respectively arranged between the outer peripheral wall surface of the inner frame 3 and the inner peripheral wall surface of the first door frame 1, so as to achieve the corresponding matching between the first door frame 1, the base layer 2 and the inner frame 3; of course, the base layer 2 can also be arranged along the circumferential direction after the first door frame 1 is arranged, and the base layers 2 arranged along the circumferential direction are surrounded by a square frame structure;

[0060] (4) A first finishing layer 5 and a second finishing layer 6 are respectively arranged on both sides of the inner frame 3 in the width direction, and a receiving groove for accommodating the second door frame 4 is formed at the setting position of the inner frame 3;

[0061] (5) A second door cover 4 is arranged in the receiving groove according to the door opening direction, thereby completing the general arrangement of the door cover structure in the door opening;

[0062] (6) In order to improve the stability and sealing of the door frame structure, a filler layer is correspondingly arranged in the gap between the first door frame 1 and the door opening; in the gap close to the outdoor side, a foaming agent is first injected for filling, and then the gap edge is repaired and leveled with a caulking material; in the gap close to the indoor side, a glass fiber cloth is first filled in the gap, and then the gap edge is repaired and leveled with putty powder, and the glass fiber cloth is used to increase the ability to resist deformation;

[0063] (7) In order to further improve the sealing performance of the door frame structure, a sealing member is provided at the junction of the door frame structure and the wall 7. Figure 1 Meanwhile, flexible waterproof coating is uniformly sprayed on the side of the wall 7 and the door frame structure close to the outside, and the coating is formed in one step to improve the overall waterproof performance of the housing unit.

[0064] Through the corresponding construction of the above steps, the corresponding setting of the door cover structure on the housing unit can be effectively realized, providing a supporting structure for the setting of the door structure on the housing unit, and also providing convenience for the application of the housing unit. Of course, the door cover structure is not only applicable to the bamboo wrapped housing unit introduced above, but also can be effectively applied in other application environments with door openings, such as on cement walls, glass walls, etc.

[0065] The door frame structure in the present invention is simple in structure and easy to set up, and can be effectively applied to the application of house units. While ensuring the stability and sealing of the door frame structure, it effectively avoids the use of corresponding connecting parts, reduces the damage to the house unit structure during the setting of the door frame structure, provides supporting support for the application of winding and bonding house units, promotes the popularization and application of house units, and has good practical value and application prospects.

[0066] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A door frame structure, characterized in that: It includes a first door cover, an inner frame and a second door cover which are sequentially arranged from the outside to the inside in the radial direction; The first door frame is formed in the form of winding and bonding, and is generally a square frame structure, and its inner peripheral wall surface is an arc surface with a certain curvature in the circumferential direction; The inner frame is arranged on the inner side of the first door frame and is a square frame structure. The width of the inner frame is smaller than the width of the first door frame, and both sides of the inner frame along the width direction do not protrude from both sides of the first door frame in the width direction. A base layer is provided between the inner frame and the first door frame, the inner and outer side walls of the base layer respectively abut against the outer peripheral wall of the inner frame and the inner peripheral wall of the first door frame, and the two sides of the base layer along the width direction respectively protrude from the two sides of the inner frame, the side of the base layer close to the inner peripheral wall of the first door frame is an arcuate surface, which abuts against and fits the inner peripheral wall of the first door frame, and the side of the base layer away from the inner peripheral wall of the first door frame is a flat surface; The inner frame is provided with facing layers on both sides along the width direction, namely, a first facing layer and a second facing layer, the two facing layers are respectively arranged closely on the inner peripheral wall surface of the base layer, and the inner peripheral wall surfaces of the two facing layers protrude from the inner peripheral wall surface of the inner frame, and a receiving groove for receiving the second door frame is formed between the two facing layers, and then the second door frame is received in the receiving groove, and the outer peripheral wall surface abuts against the inner peripheral wall surface of the inner frame; The base layer is provided with a step surface in a circumferential direction on its inner circumferential wall surface, so that one side of the inner frame along the width direction can be positioned corresponding to the step surface, and the two sides of the base layer along the width direction are respectively flush with the two sides of the first door frame, and the first finishing layer and the second finishing layer are respectively extended at the end corners of one side and correspondingly cover the two side surfaces of the first door frame and the base layer along the width direction.

2. The door frame structure according to claim 1, wherein: The center line of the inner frame coincides with the center line of the first door frame, and the door frame structure is divided into an indoor part and an outdoor part by the center line of the inner frame.

3. The door frame structure according to claim 2, wherein: The first finishing layer is a cement finishing panel, which is arranged in the outdoor part; the second finishing layer is an interior decoration panel, which is arranged in the indoor part.

4. A housing unit, wherein a door opening is provided on a wall thereof, and a door frame structure as claimed in any one of claims 1 to 3 is arranged in the door opening, characterized in that: The door opening is opened corresponding to the first door frame, and its inner peripheral wall surface is an arc-shaped surface with a certain curvature in the circumferential direction. The door frame structure is correspondingly embedded in the door opening and then fixed.

5. The housing unit according to claim 4, wherein: A filling layer is filled between the outer peripheral wall surface of the first door frame and the inner peripheral wall surface of the door opening, and the filling layer is divided into a first filling layer and a second filling layer by the center line of the inner frame to correspond to the outer wall part and the inner wall part of the wall body respectively.

6. The housing unit according to claim 5, wherein: The first filling layer includes a foaming agent for filling the gap and a filling material for smoothing the seam opening; the second filling layer includes a glass fiber cloth for filling the gap and a putty powder for trimming the edge of the seam opening.

7. The building unit according to any one of claims 4 to 6, wherein: The two ends of the first finishing layer and the second finishing layer which are away from each other extend on the outer peripheral wall surface of the door frame structure respectively, and extend to the wall surface abutting the wall body, that is, the two finishing layers respectively cover the two ends of the door frame structure along the width direction.

8. A method for installing a door frame structure on a house unit, used to install the door frame structure according to any one of claims 1 to 3 on a house unit, characterized in that: The steps include: (1) Opening a door opening on the prepared housing unit; (2) embedding and installing the first door frame into a corresponding position in the door opening, and providing a base layer in the first door frame along a circumferential direction; (3) embedding the inner frame into the square frame structure enclosed by the base layer so that the outer peripheral wall surface of the inner frame abuts against the wall surface of the base layer; (4) a first finishing layer and a second finishing layer are respectively provided on both sides of the inner frame in the transverse direction to form a receiving groove for receiving the second door frame; (5) The second door frame is correspondingly embedded in the receiving groove to realize the installation of the door frame structure in the door opening.

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