A prefabricated door frame

Abstract

This invention relates to the technical field of frame structures, specifically a prefabricated door frame, including frame panels on both sides of an opening and beams. The tops of the frame panels abut against the bottoms of the beams, and an adhesive layer is provided between the frame panels and the beams. The end faces of the beams are flush with the sides of the frame panels. Each frame panel has a first connecting portion on its side away from the other frame panel, and each beam has a second connecting portion on its end face. The first and second connecting portions have the same cross-section. The frame panels and beams are made of lightweight concrete. This solution eliminates the need for secondary reinforcement. Furthermore, it avoids hollow holes and the need for grouting, simplifying construction and avoiding a series of problems associated with grouting hollow holes. It also prevents waste of construction materials and reduces labor, time, and subsequent maintenance costs.

Description

Technical Field

[0001] This invention relates to the technical field of frame structures, specifically to an assembled door frame. Background Technology

[0002] In the construction industry, the installation of door and window openings is necessary, primarily using prefabricated partition wall panels and door and window frames. To reduce the building's structural weight and ensure construction progress, hollow core panels are currently used for prefabricated door and window frames. However, according to existing partition wall technical specifications, "for hollow door and window frame panels... the area within 120mm of the panel edge should be solid" and "when hollow core panels are used as door and window frame panels, there should be no hollow holes within 120mm to 150mm of the panel edge." Therefore, grouting is required for the door and window frame panels during construction.

[0003] However, the hollow holes in door and window frames are small, limiting the working space. Grouting is time-consuming and labor-intensive, and the varying skill levels of the workers make it difficult to achieve a dense seal. This results in an unstable connection when fixing the door and window frames, leading to inverted V-shaped cracks that are difficult to repair later. Using existing door and window frames wastes grouting materials, labor, and time, and cannot guarantee quality, increasing maintenance difficulty and costs for future homeowners. Therefore, there is an urgent need for door and window frames that are easy to install and require no grouting. Summary of the Invention

[0004] The present invention aims to provide a prefabricated door frame that is simple to construct and install without the need for grouting.

[0005] This invention provides the following basic solution:

[0006] A prefabricated door frame includes frame plates on both sides of an opening and a beam plate. The top of the frame plates abuts against the bottom of the beam plate. An adhesive layer is provided between the frame plates and the beam plate. The end face of the beam plate is flush with the side face of the frame plate.

[0007] The side of the frame plate away from the other frame plate is provided with a first connecting part, and the end face of the beam plate is provided with a second connecting part. The cross-section of the first connecting part and the second connecting part is the same. The material of the frame plate and the beam plate is lightweight concrete.

[0008] The beneficial effects of the basic scheme:

[0009] This solution can be applied to door and window openings. In use, the frame plate is moved to the marked positions on both sides of the opening. After adjusting the verticality and flatness of the frame plate against the wall, it is fixed in place. At this point, the side of the frame plate with the first connecting part abuts against the wall. Subsequently, a beam is placed on top of the frame plate and connected to it. The beam design allows this solution to be applied to buildings with higher ceilings, such as office buildings and hotels. The beam bears the self-weight of the masonry above the opening and the loads from the upper structure, transferring these loads to the walls on both sides of the opening.

[0010] The first and second connecting parts can be designed to fit with existing partition walls, enabling compatible installation. This maximizes the assurance that the appearance of most different materials and types of partition walls on the market does not require modification, avoiding unnecessary resource waste caused by customizing new production molds and increasing the applicability of the frame and beam panels. In this solution, lightweight concrete is used for the frame and beam panels, and materials of different strength grades can be selected according to the required strength.

[0011] Compared with existing technologies, this solution uses lightweight concrete frame panels and beams in combination, with material strength meeting the requirements for door and window frames, eliminating the need for secondary reinforcement. Furthermore, it eliminates hollow holes, eliminating the need for grouting, simplifying construction, and thus avoiding a series of problems associated with grouting hollow holes, preventing waste of construction materials, and reducing labor, time, and subsequent maintenance costs.

[0012] Furthermore, the top of each frame slab has blind connection holes, and the bottom of each beam slab has through connection holes coaxial with the blind connection holes. It also includes connectors, one end of which passes through the through connection hole and is inserted into the blind connection hole. A chemical bonding layer is provided between the peripheral wall of the connector and the walls of the through and blind connection holes. Beneficial effects: This design achieves a fixed connection between the beam slab and frame slab by inserting reinforcing bars or bolts through the through connection holes into the blind connection holes. The chemical bonding layer is formed by the expansion of the connector's broken bolt chemical tube, filling the through and blind connection holes, further improving the stability of the connection between the connector and the frame and beam slabs. Compared with existing technologies, this significantly reduces the probability of wall cracks, thereby greatly reducing maintenance costs caused by wall cracking.

[0013] Furthermore, both the first and second connecting parts are grooves, and the cross-section of the grooves is trapezoidal. Beneficial effects: This design facilitates the filling of bonding mortar to achieve the connection between the frame slab, beam slab, and partition wall panel (or cast-in-place wall). Simultaneously, the trapezoidal design is compatible with most partition wall panels on the market. The end faces of the beam slab and the sides of the frame slab form a continuous plane, facilitating the construction and installation of the frame slab and beam slab in door and window openings.

[0014] Furthermore, anchoring holes are provided at the bottom of each frame panel, and these holes are vertically positioned. Benefits: This design allows the frame panels to be fixed to the ground, facilitating their installation.

[0015] Furthermore, it also includes an L-shaped first auxiliary device and a second auxiliary device, which are detachably connected to the frame plate and the beam plate, respectively;

[0016] The first auxiliary device is provided with two protrusions, which are parallel to the two mutually perpendicular sides of the frame plate.

[0017] The second auxiliary device is slidably connected to a slider, which has a sliding groove and a fixing groove.

[0018] The groove depths of the fixed groove and the sliding groove are perpendicular to the two mutually perpendicular sides of the frame plate, respectively. The groove opening of the sliding groove is flush with the side of the protrusion away from the frame plate and beam plate, and the groove depth of the sliding groove is the same as the thickness of the protrusion.

[0019] The opening of the fixed groove is flush with the side of the other protrusion away from the frame plate and beam plate, and the depth of the fixed groove is the same as the thickness of the other protrusion.

[0020] Beneficial effects: The first and second auxiliary devices are used to assist in the installation of frame plates and beam plates. The L-shaped design, with its right angle, abuts against the edges of the frame plates and beam plates for coordinated use. The protrusion and sliding groove work together. Because the groove opening is flush with one side, and the groove depth and thickness are the same, when the protrusion is located in the sliding groove and abuts against the bottom of the sliding groove, it means that one side of the beam plate and frame plate is flush.

[0021] In this case, move the beam plate so that the slider and the second auxiliary device move relative to each other until the other protrusion is located in the fixed groove and abuts against the bottom of the fixed groove. This means that the other side of the beam plate and the frame plate are flush. When both vertical sides are flush, it means that the frame plate and the beam plate are in a state where they can be fixedly connected. At this time, the frame plate and the beam plate can be fixedly connected by the connector.

[0022] Compared with existing technologies, this solution, through the combined use of the first and second auxiliary devices, eliminates the need for human visual judgment regarding the alignment of the frame plate and beam plate, reducing the operational difficulty of aligning the frame plate and beam plate and improving the accuracy and convenience of the operation. Simultaneously, when moving the beam plate to align with the other side of the frame plate, the bottom of the beam plate contacts the top of the frame plate, ensuring that the adhesive layer evenly covers the top of the frame plate, further increasing the stability of the connection between the frame plate and beam plate.

[0023] Furthermore, both the first and second auxiliary devices are equipped with clamping springs, which are parallel to the sliding direction of the slider. Beneficial effect: The design of the clamping springs, in conjunction with the L-shaped arrangement of the first and second auxiliary devices, allows the first and second auxiliary devices to be clamped onto the frame or beam plate, thereby achieving a detachable connection with the frame and beam plate.

[0024] Furthermore, it also includes a metal strip, one end of which is connected to the free end of the clamping spring, and the other end of which is connected to the end of the second auxiliary device away from the clamping spring. The metal strip abuts against the top of the beam plate. Beneficial effect: With this design, when the first and second auxiliary devices are removed, the metal strip scrapes across the top of the beam plate, thereby cleaning the top of the beam plate, for example, cleaning substances of the same composition as the chemical adhesive layer that overflow from the connecting through-holes.

[0025] Furthermore, the longitudinal section of the protrusion is irregular, while the longitudinal sections of the sliding and fixed grooves are the same in shape and size as those of the protrusion. Beneficial effect: This design allows the protrusion to fit perfectly into the sliding or fixed groove, reducing gaps and thus improving the accuracy of alignment between the frame and beam.

[0026] Furthermore, the second auxiliary device has a groove on the side facing the first auxiliary device, which connects to the side of the second auxiliary device away from the frame plate and beam plate. A slide rail is installed within the groove and connects to the slider. Beneficial effects: The groove design provides both accommodating and sliding space for the slider, allowing it to slide via the slide rail, thereby achieving alignment between the beam plate and the frame plate.

[0027] Furthermore, the number of slide rails is multiple. Beneficial effect: This design improves the stability of the slider during sliding, prevents slider deviation, and thus improves the accuracy of aligning beams and frame plates. Attached Figure Description

[0028] Figure 1 This is an exploded view of a first embodiment of a prefabricated door frame according to the present invention;

[0029] Figure 2 This is a top sectional view of a beam plate in an embodiment of an assembled door frame according to the present invention;

[0030] Figure 3 This is a schematic diagram of the assembly of a prefabricated door frame according to an embodiment of the present invention, after the frame plate and beam plate are connected.

[0031] Figure 4 This is a schematic diagram of the structure of the first auxiliary device and the second auxiliary device in a second embodiment of the assembled door frame of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the first auxiliary device and the second auxiliary device under another embodiment of the prefabricated door frame of the present invention;

[0033] Figure 6 This is a schematic diagram of the first and second auxiliary devices in a third embodiment of the assembled door frame of the present invention. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] The reference numerals in the accompanying drawings include: frame plate 1, reinforcing rib 2, first connecting part 3, anchoring hole 4, beam plate 5, connecting blind hole 6, connecting through hole 7, second connecting part 8, bolt agent tube 9, connecting bolt 10, first auxiliary device 11, second auxiliary device 12, protrusion 13, slider 14, sliding groove 15, fixing groove 16, clamping spring 17.

[0036] Example 1

[0037] A prefabricated door frame, as shown in the attached image. Figure 1 As shown, the structure includes frame slabs 1 on both sides of the opening and beam slabs 5. The opening is a door or window opening designed into the building. When the building's floor height is less than three meters, such as in ordinary residential buildings, a hanging lintel is used, meaning that the area above the opening frame slabs 1 can be cast in, and beam slabs 5 are not required. When the building's floor height is not less than three meters, such as in office buildings or hotels, beam slabs 5 are required.

[0038] The frame slab 1 and beam slab 5 are made of lightweight concrete. Different strength grades of lightweight concrete can be selected as needed. In this embodiment, LC10 lightweight concrete is used for both frame slab 1 and beam slab 5. Lightweight concrete is a relatively mature existing material, and therefore will not be described in detail.

[0039] As attached Figure 2 As shown, reinforcing ribs 2 are provided within the frame slab 1 and beam slab 5. The reinforcing ribs 2 are centrally located and include continuous reinforcing bars and stirrups connected to them. The axial direction of the continuous reinforcing bars is parallel to the length direction of the frame slab 1 and beam slab 5, and the stirrups are parallel to the end faces of the frame slab 1 and beam slab 5. The stirrups are evenly distributed along the axial direction of the continuous reinforcing bars. Specifically, there are four continuous reinforcing bars, arranged in a rectangular axial direction. Multiple stirrups are evenly distributed along the axial direction of the continuous reinforcing bars, and each stirrup is rectangular. The four corners of the stirrups are fixedly connected to the continuous reinforcing bars. In this embodiment, the stirrups and continuous reinforcing bars are connected by steel wires, which pass through and are tightened. Multiple steel wires can be used to increase the strength of the connection. In other embodiments, the stirrups and continuous reinforcing bars are welded together. This design increases the strength and load-bearing capacity of the frame slab 1 and beam slab 5 while preventing circumferential expansion of the lightweight concrete.

[0040] The top of each frame plate 1 abuts against the bottom of each beam plate 5. Each frame plate 1 has a blind connection hole 6 at its top, and each beam plate 5 has a through connection hole 7 coaxial with the blind connection hole 6 at its bottom. Initially, a bolt agent tube 9 is placed inside the blind connection hole 6. After the frame plate 1 and beam plate 5 are connected, as shown in the attached... Figure 3 As shown, an adhesive layer is provided between the contact surfaces of the frame plate 1 and the beam plate 5. In this embodiment, the adhesive layer is epoxy resin.

[0041] It also includes a connector, one end of which passes through the connecting through hole 7 and is inserted into the connecting blind hole 6. A chemical adhesive layer is provided between the peripheral wall of the connector and the hole walls of the connecting through hole 7 and the connecting blind hole 6. The chemical adhesive layer is a substance that expands and fills the connecting through hole 7 and the connecting blind hole 6 after the connector breaks the bolt agent tube 9, thereby fixing the connector to the frame plate 1 and the beam plate 5. In this embodiment, the connector uses a connecting bolt 10; in other embodiments, the connector uses a steel bar of the same diameter.

[0042] The end face of beam slab 5 is flush with the side face of frame slab 1. Each side of frame slab 1 away from the other frame slab 1 is provided with a first connecting portion 3, and each end face of beam slab 5 is provided with a second connecting portion 8. The cross-section of the second connecting portion 8 is the same as that of the first connecting portion 3. Specifically, the first connecting portion 3 is a groove formed on the side face of frame slab 1, and the second connecting portion 8 is a groove formed on the end face of beam slab 5. The plane of the groove opening is parallel to the bottom of the groove. The cross-section of the groove is an isosceles trapezoid, with the bottom of the groove being the upper base of the isosceles trapezoid and the bottom of the groove opening being the lower base of the isosceles trapezoid. This design reduces the guiding effect of the bonding mortar, ensuring that the stress on the bonding mortar is evenly distributed within the groove.

[0043] Anchor holes 4 are provided at the bottom of each frame plate 1. The axial direction of the anchor holes 4 is parallel to the length direction of the frame plate 1, that is, the anchor holes 4 are vertically arranged. In other embodiments, pipe clamps are embedded in the anchor holes 4.

[0044] This solution offers several advantages: First, the connection between frame panel 1 and beam panel 5 using chemical anchors significantly reduces the likelihood of wall cracks, thereby greatly minimizing repair costs. Second, it reduces on-site cutting work, thus reducing dust and construction waste; it also lowers the skill requirements for installers, significantly increasing installation speed and per capita income. Third, it accommodates the installation of openings for most different materials and types of partition walls currently on the market, ensuring that the appearance of most partition walls made of various materials and types does not require modification, avoiding unnecessary resource waste caused by customizing new production molds. Fourth, the factory conducts batch and standardized production according to project requirements, which not only ensures product quality but also reduces construction and material costs, greatly improving the project's assembly rate.

[0045] Example 2

[0046] During construction, the designed building drawings are refined. Based on these refined drawings, the positions of doors and windows are located. Frame plate 1 is then fixed at these positions, adhesive is applied to frame plate 1, and beam plate 5 is fixed to the top of frame plate 1. During installation, it is necessary to ensure that the ends of beam plate 5 are aligned with the side walls of frame plate 1. However, in reality, the alignment of beam plate 5 and frame plate 1 is assisted by laser positioning, relying primarily on human judgment, which requires a significant amount of time for alignment, and is difficult to accurately determine with the naked eye. Therefore, this embodiment differs from Embodiment 1 in that:

[0047] A prefabricated door frame, as shown in the attached image. Figure 3 As shown, it also includes an L-shaped first auxiliary device 11 and a second auxiliary device 12, which are detachably connected to the frame plate 1 and the beam plate 5, respectively. Specifically, the first auxiliary device 11 and the second auxiliary device 12 can be detachably connected to the frame plate 1 and the beam plate 5, respectively, using screws. In this embodiment, during use, the first auxiliary device 11 is connected to the beam plate 5, and the second auxiliary device 12 is connected to the frame plate 1. In other embodiments, the first auxiliary device 11 is connected to the frame plate 1, and the second auxiliary device 12 is connected to the beam plate 5.

[0048] The first auxiliary device 11 is provided with two protrusions 13, which are parallel to the two mutually perpendicular sides of the frame plate 1. Specifically, the first auxiliary device 11 includes a first part and a second part that are perpendicular to each other and connected. The first part is parallel to the side wall of the beam plate 5, and the second part is parallel to the end face of the beam plate 5. A protrusion 13 is provided below both the first part and the second part. The thickness of the protrusion 13 is less than the thickness of the first auxiliary device 11, and the side of the protrusion 13 away from the beam plate 5 is flush with the side of the first auxiliary device 11 away from the beam plate 5. The longitudinal section of the protrusion 13 is irregular, with the width of the longitudinal section at the free end of the protrusion 13 being greater than that at the other end. In this embodiment, the longitudinal section of the protrusion 13 includes both rectangular and circular shapes, with the diameter of the circle being greater than the width of the rectangle.

[0049] A slider 14 is slidably connected to the second auxiliary device 12. The slider 14 has a sliding groove 15, and the second auxiliary device 12 has a fixing groove 16. A sliding channel is formed on the side of the second auxiliary device 12 facing the first auxiliary device 11, connecting the side of the second auxiliary device 12 away from the frame plate 1 and beam plate 5. A slide rail is provided within the sliding channel and connected to the slider 14. In other embodiments, multiple slide rails are used. Specifically, the second auxiliary device 12 includes a sliding part and a fixing part that are perpendicular to each other and connected. The sliding part has a sliding channel, and the fixing part has a fixing groove 16. The depth of the fixing groove 16 is the same as the thickness of the protrusion 13 used in conjunction with it.

[0050] The second auxiliary device 12 and the slider 14 include several options. Option 1: The slide groove connects the top of the sliding part and the side away from the frame plate 1. The slider 14 is slidably connected to the slide groove. A sliding groove 15 is formed on the side of the slider 14 away from the frame plate 1. The groove depth of the sliding groove 15 is the same as the thickness of the protrusion 13 used in conjunction with it. The longitudinal section of the sliding groove 15 and the fixed groove 16 are the same in shape and size as the longitudinal section of the protrusion 13. That is, the sliding groove 15, the fixed groove 16, and the protrusion 13 are all the same in shape and size. There are two slide rails. The side of the slider 14 facing the frame plate 1 and the top of the sliding part are connected to the two slide rails respectively. The slider 14 moves within the slide groove through the slide rails.

[0051] Option 2: As attached Figure 5 As shown, the chute also connects to the bottom of the second auxiliary device 12. At this time, the chute connects the top, bottom, and the side away from the frame plate 1 of the sliding part. The slider 14 is slidably connected to the chute on the side facing the frame plate 1. The sliding groove 15 has the same shape as the rectangular section of the protrusion 13, and the groove depth of the sliding groove 15 is the same as the thickness of the protrusion 13 used in conjunction. Compared with the first scheme, the chute is vertically continuous, and impurities are less likely to remain in the chute, thus avoiding affecting the sliding of the slider 14.

[0052] In this embodiment, the second auxiliary device 12 and the slider 14 adopt Scheme 1. The groove depth directions of the fixed groove 16 and the sliding groove 15 are respectively perpendicular to the two mutually perpendicular sides of the frame plate 1. The sliding groove 15 and the protrusion 13 are located on the same side of the frame plate 1. For example, if the protrusion 13 on the first part and the sliding groove 15 are located on the same side, then the groove opening of the sliding groove 15 is flush with the side of the protrusion 13 away from the beam plate 5, and the groove depth of the sliding groove 15 is the same as the thickness of the protrusion 13. The fixed groove 16 and another protrusion 13 are located on the other side of the frame plate 1. For example, if the protrusion 13 on the second part and the fixed groove 16 are located on the same side, then the groove opening of the fixed groove 16 is flush with the side of the other protrusion 13 away from the beam plate 5, and the groove depth of the fixed groove 16 is the same as the thickness of the other protrusion 13.

[0053] When installing frame plate 1 and beam plate 5, the first auxiliary device 11 is installed on beam plate 5, with its bottom flush with the bottom of beam plate 5 and abutting against the end face and one side wall of beam plate 5. The second auxiliary device 12 is installed on frame plate 1, with its top flush with the top surface of frame plate 1 and abutting against the adjacent side walls of frame plate 1. Taking the connection between left frame plate 1 and beam plate 5 as an example, in the initial state, slider 14 is located on the left side of the slide groove. Protrusion 13 is placed in sliding groove 15. At this time, the end of beam plate 5 is located on the left side of frame plate 1. When protrusion 13 is completely placed in sliding groove 15, that is, one side of protrusion 13 is flush with the groove opening plane of sliding groove 15, beam plate 5 and one side of frame plate 1 are aligned. Moving beam plate 5 causes slider 14 to move within the groove, i.e., moving beam plate 5 to the right. When the other protrusion 13 is fully positioned within the fixing groove 16, beam plate 5 and the other side of frame plate 1 are aligned, thus completing the alignment of beam plate 5 and the left side of frame plate 1. During the alignment process, beam plate 5 needs to be moved, causing relative displacement between the bottom of beam plate 5 and the top of frame plate 1, which allows the adhesive to be applied more evenly, improving the tightness of the connection between frame plate 1 and beam plate 5. After connecting frame plate 1 and beam plate 5, the first auxiliary device 11 and the second auxiliary device 12 can be removed. Compared with the prior art of human judgment, this method offers higher accuracy and faster alignment speed.

[0054] Example 3

[0055] The difference between this embodiment and Embodiment 2 is as follows: (see attached) Figure 6 As shown, both the first auxiliary device 11 and the second auxiliary device 12 are equipped with clamping spring pieces 17. The clamping spring pieces 17 are located at the free ends of the first auxiliary device 11 and the second auxiliary device 12, forming a "U" shape with the first auxiliary device 11 and the second auxiliary device 12. The free end of the second auxiliary device 12 is the end away from the slider 14, that is, the clamping spring piece 17 is parallel to the sliding direction of the slider 14, and the clamping spring piece 17 is arranged at the same position on the first auxiliary device 11. For example, if the first part and the sliding part are located on the same plane, then the second part and the fixed part are located on the same plane, and the clamping spring piece 17 is arranged parallel to the plane where the first part and the sliding part are located. The clamping spring piece 17 is inclined towards the second auxiliary device 12, and the free end of the clamping spring piece 17 is bent into a guide part towards the side away from the second auxiliary device 12.

[0056] In this solution, the clamping spring 17 is set to fix the first auxiliary device 11 and the second auxiliary device 12 on the frame plate 1 and the beam plate 5. The guide part is set to facilitate pushing the component formed by the second auxiliary device 12 and the clamping spring 17 onto the frame plate 1 when fixing the second auxiliary device 12, and at the same time clamping the second auxiliary device 12 tightly onto the frame plate 1.

[0057] It also includes a metal strip, one end of which is connected to the free end of the clamping spring 17, and the other end of which is connected to the end of the second auxiliary device 12 away from the clamping spring 17. The metal strip abuts against the top of the beam plate 5. The metal strip is U-shaped, and its width is the same as the width of the beam plate 5. When the beam plate 5 is placed on the frame plate 1, the metal strip abuts against the top of the beam plate 5. In other embodiments, the metal strip is connected to the first auxiliary device 11.

[0058] After the bolt chemical tube 9 of the connector is broken, the chemical in the bolt chemical tube 9 will expand and fill the blind hole 6 and the through hole 7 of the connector. Some of the substance will overflow from the through hole 7. This solution is equipped with a metal strip. When the first auxiliary device 11 or the second auxiliary device 12 is removed, the metal strip scrapes across the top of the beam plate 5 to clean the top of the beam plate 5.

[0059] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A prefabricated door frame, characterized in that: It includes frame panels on both sides of the opening and beams. The top of the frame panels abuts against the bottom of the beams. There is an adhesive layer between the frame panels and the beams. The end face of the beams is flush with the side of the frame panels. The side of the frame plate away from the other frame plate is provided with a first connecting part, and the end face of the beam plate is provided with a second connecting part. The cross-section of the first connecting part and the second connecting part is the same. The material of the frame plate and the beam plate is lightweight concrete. It also includes an L-shaped first auxiliary device and a second auxiliary device, which are detachably connected to the frame plate and the beam plate, respectively; The first auxiliary device is provided with two protrusions, which are parallel to the two mutually perpendicular sides of the frame plate. The second auxiliary device is slidably connected to a slider, which has a sliding groove and a fixing groove. The groove depths of the fixed groove and the sliding groove are perpendicular to the two mutually perpendicular sides of the frame plate, respectively. The groove opening of the sliding groove is flush with the side of the protrusion away from the frame plate and beam plate, and the groove depth of the sliding groove is the same as the thickness of the protrusion. The opening of the fixed groove is flush with the side of the other protrusion away from the frame plate and beam plate, and the depth of the fixed groove is the same as the thickness of the other protrusion. Both the first and second auxiliary devices are equipped with clamping springs, which are located at the free ends of the first and second auxiliary devices.

2. The prefabricated door frame according to claim 1, characterized in that: The top of the frame plate is provided with a blind hole for connection, and the bottom of the beam plate is provided with a through hole for connection coaxial with the blind hole for connection; it also includes a connector, one end of which passes through the through hole for connection and is inserted into the blind hole for connection, and a chemical adhesive layer is provided between the peripheral wall of the connector and the hole wall of the through hole and the blind hole for connection.

3. The prefabricated door frame according to claim 1, characterized in that: The first connecting part and the second connecting part are grooves, and the cross-section of the grooves is trapezoidal.

4. A prefabricated door frame according to claim 1, characterized in that: Anchor holes are provided at the bottom of the frame plates, and the anchor holes are set vertically.

5. A prefabricated door frame according to claim 4, characterized in that: The clamping spring is parallel to the sliding direction of the slider.

6. A prefabricated door frame according to claim 5, characterized in that: It also includes a metal strip, one end of which is connected to the free end of the clamping spring, and the other end of which is connected to the end of the second auxiliary device away from the clamping spring. The metal strip abuts against the top of the beam plate.

7. A prefabricated door frame according to claim 4, characterized in that: The longitudinal section of the protrusion is irregular, while the longitudinal sections of the sliding groove and the fixed groove are the same in shape and size as the longitudinal section of the protrusion.

8. A prefabricated door frame according to claim 4, characterized in that: The second auxiliary device has a groove on the side facing the first auxiliary device. The groove connects to the side of the second auxiliary device away from the frame plate and beam plate. A slide rail is provided in the groove, and the slide rail is connected to the slider.

9. A prefabricated door frame according to claim 8, characterized in that: There are multiple slide rails.

Images