A method for constructing a flexible-rigid composite installation joint of a residential window frame and a composite installation joint structure

Abstract

The application relates to the field of building door and window installation, in particular to a residential window frame flexible-rigid composite installation joint construction method and a composite installation joint structure, which comprises the following steps: accurately positioning a window frame and forming an installation joint between the window frame and a wall hole; continuously filling polyurethane foaming material into the installation joint; in a plastic state of the foaming material which has not been completely solidified, using a pressure displacement tool to press and displace the foaming material in a set region to the middle of the installation joint, continuously forming a continuous reserved groove on the outside without damage, and keeping the closed pore structure of the outer surface layer of the foaming material complete; filling polyurethane waterproof mortar mixed with a micro-expansion agent into the reserved groove, and forming an outer rigid support waterproof layer which cooperates with the foaming core layer after solidification. The composite installation joint structure comprises a point type bearing structure, a continuous elastic heat preservation buffer layer which is compacted by pressure displacement in a plastic state, and an outer support waterproof layer. The application realizes comprehensive performance improvement of the window frame installation joint in aspects of bearing stability, waterproof and anti-permeability and thermal bridge.

Description

Technical Field

[0001] This application relates to the field of building door and window installation, and in particular to a construction method and structure for a flexible-rigid composite installation joint for residential window frames. Background Technology

[0002] During the installation of exterior windows in existing residential buildings, a circumferential installation joint is usually formed between the window frame and the wall opening. One common method to address this joint is to directly fill and support it with cement mortar or fine aggregate concrete at the bottom and sides of the window frame. While this method provides some rigid support for the window frame, the high thermal conductivity of mortar or concrete can easily create continuous thermal bridges around the window frame. This leads to heat loss from the interior in winter and heat transfer from the exterior in summer, reducing the overall thermal insulation performance of the building envelope. At the same time, the rigid filling material is prone to shrinkage cracks under long-term temperature and humidity changes and the vibration of the window opening and closing. Once these cracks are connected, they become channels for rainwater to seep into the interior, causing dampness and mold growth on the walls.

[0003] Another common practice is to first use polyurethane foam to continuously fill the gaps around the window frame, utilizing its good expansion and adhesion to achieve sealing and insulation. While installation joint structures relying solely on foam perform well in terms of sealing and thermal insulation, in vertical stress areas such as the bottom of the window frame that bear the weight of the window and wind loads, the foam is prone to creep deformation after long-term pressure, leading to settlement at the bottom of the window frame and subsequent tearing and failure of the outer waterproof sealant layer. In addition, some construction practices involve cutting, trimming, or grooving the outer surface of the foam after it has fully cured with a knife to facilitate subsequent filling with waterproof mortar or applying sealant. This cutting operation destroys the dense closed-cell structure that naturally forms on the surface of the foam during curing, exposing the internal porous core layer directly to the external environment. Exposed pores are prone to absorbing moisture during long-term service, causing durability damage such as moisture absorption and expansion, freeze-thaw powdering, and creating seepage pathways at the interface between the foam and mortar, seriously affecting the overall waterproof reliability and service life of the installation joint.

[0004] It is evident that existing construction methods struggle to create a sufficiently rigid and controllable waterproof outer layer for high-risk and high-stress areas such as the bottom and sides of the window frame, while preserving the intact closed-cell structure of the expanding foam surface and avoiding thermal bridging around the window frame. Therefore, a new window frame installation method is urgently needed. This method should be able to create a continuous pre-reserved groove structure on the outer side of the expanding foam without damage during its pre-cured plastic phase, and fill the groove with rigid waterproof mortar. This would form a dense, elastic insulating core layer in the middle of the installation joint and a rigid supporting waterproof layer on the outer side. Both layers would work together and remain continuous, thus simultaneously meeting the comprehensive requirements of the window frame installation joint in terms of load-bearing stability, waterproofing, thermal breakage, and long-term durability. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a construction method and structure for a flexible-rigid composite installation joint for residential window frames. This method allows for the formation of a continuous pre-reserved groove structure on the outer side of the window frame without damage during the plastic period before the foam has cured. Rigid waterproof mortar is then filled into the groove, creating a dense, elastic thermal insulation core layer in the middle of the installation joint and a rigid supporting waterproof layer on the outer side. Both layers work together to bear the load and are continuous as a whole, thus simultaneously meeting the comprehensive requirements of window frame installation joints in terms of load-bearing stability, waterproofing, thermal break, and long-term durability.

[0006] This application is achieved through the following technical solution: A method for constructing a flexible-rigid composite installation joint for residential window frames includes the following steps: S1, Base treatment and positioning: Clean the base of the main structure where the window frame is installed, and mark the window position line at the wall opening of the main structure; S2, Precise positioning and point-bearing fixing of window frame: The window frame is placed into the wall opening for adjustment and positioning, and load-bearing pads and positioning pads are placed at the bottom and side gaps corresponding to the predetermined fixing holes of the window frame, respectively; so that a point-bearing limiting structure and a circumferential continuous installation seam are formed between the window frame and the wall opening. S3, Continuous filling of foam material: Continuously filling the circumferentially continuous installation seam with polyurethane foam material; S4, Pre-formed groove during the plasticity period of the foam material: When the polyurethane foam material is filled and is in a plastic state that is not fully cured, the polyurethane foam material in a set area in the circumferential continuous installation joint is pressed and moved towards the center of the installation joint using a pressing and moving tool to increase the density of the polyurethane foam material in the center of the installation joint, and a continuous reserved groove is formed without damage on the outside of the pressing and moving area. During the pressing and moving process, the integrity of the closed-cell structure of the outer surface layer of the polyurethane foam material after curing is maintained. S5, Rigid support waterproof layer construction: Polyurethane waterproof mortar mixed with micro-expansion agent is filled into the continuous reserved groove, and after curing, an outer support waterproof layer is formed. The outer support waterproof layer is combined with the continuous elastic thermal insulation buffer layer formed by the polyurethane foam material in the middle of the installation joint and works together to support the positioning window frame.

[0007] By adopting the above technical solution, after the window frame installation joint is filled with polyurethane foam, during the period when the foam is not fully cured and is still in a plastic state, a pressing and shifting tool is used to press and shift the foam material from the bottom and left and right side downward areas towards the center of the installation joint. This increases the density of the foam material in the center of the installation joint, enhancing the elasticity, insulation, and airtightness of that area. Furthermore, it forms a continuous pre-reserved groove on the outside of the pressed and shifted area in a non-destructive manner. Throughout the pressing and shifting operation, the integrity of the closed-cell structure of the cured outer layer of the foam material is maintained, avoiding the problems of exposed cells, moisture absorption and powdering, and water seepage caused by traditional cutting and trimming methods. Subsequently, towards... The pre-reserved groove is filled with polyurethane waterproof mortar mixed with a micro-expansion agent, which, after curing, forms a rigid support waterproof layer with shrinkage compensation capability. This rigid outer layer not only provides durable and stable support for the window frame, effectively resisting vertical settlement caused by the window's own weight and wind load, but also blocks most rainwater and ultraviolet rays outside the installation joint. Meanwhile, the dense foam core layer in the middle of the installation joint maintains a low thermal conductivity, blocking the indoor and outdoor heat conduction path and eliminating thermal bridges around the window frame. The rigid mortar layer and the elastic foam core layer are a natural interface formed without cutting, and the two are closely bonded and work together to achieve the composite functional requirements of load-bearing, waterproofing, heat insulation, and crack resistance.

[0008] Optionally, in step S2, the process of adjusting and positioning the window frame by placing it into the wall opening specifically includes: placing an adjusting airbag at the bottom of the wall opening; after placing the window frame into the wall opening, placing adjusting airbags between the left and right sides of the window frame and the wall opening; adjusting the bottom and side adjusting airbags by inflating or deflating them, and using vertical and horizontal control lines to continuously adjust and level the window frame; after placing the load-bearing pads and positioning pads at the bottom and side gaps corresponding to the predetermined fixing holes of the window frame, removing the bottom and side adjusting airbags, and mechanically fixing the window frame to the main structure.

[0009] By adopting the above technical solution, the precise positioning of the window frame within the wall opening does not rely on repeated tapping with wooden wedges or shims. Instead, it utilizes the inflation and deflation of bottom and lateral adjusting airbags, along with vertical and horizontal control lines provided by a laser plumb line, to continuously adjust the window frame's spatial position within the opening until it achieves the designed horizontal and vertical alignment. After positioning, load-bearing and positioning blocks are placed at the gaps corresponding to the predetermined fixing holes. Once the blocks are in place, the airbags are deflated and removed before mechanical fixing. After the airbags are removed, the window frame is in a stable support system formed by the point-support blocks. During mechanical fixing, the window frame position will not shift due to tapping or tightening force, significantly improving the positioning accuracy and construction controllability of the window frame installation.

[0010] Optionally, after step S1 and before step S2, the method further includes: setting a first sealing layer: pre-attaching a waterproof sealing strip around the window frame, the width of the waterproof sealing strip being smaller than the width of the window frame along the wall thickness direction, and the waterproof sealing strip being attached to the inner side or middle of the joint area between the window frame and the wall opening to form a physical water-blocking layer; the outer side of the waterproof sealing strip in the thickness direction is completely covered and wrapped by the polyurethane foam material in the subsequent step S3.

[0011] By adopting the above technical solution, before the window frame is inserted into the wall opening and mechanically fixed to the main structure, a waterproof sealing strip with a width smaller than the width of the window frame along the wall thickness direction is first pasted around the perimeter of the window frame. The sealing strip is located on the inner side or in the middle of the joint area between the window frame and the wall opening, forming a physical barrier layer to intercept water. When polyurethane foam material is subsequently filled into the circumferential installation joint, the foam material expands and fills the entire installation joint, while simultaneously covering the outer side of the waterproof sealing strip along its thickness direction. This layered wrapping structure creates a continuous and uninterrupted waterproof barrier between the sealing strip and the foam material. Even if micro-cracks appear in the outer rigid waterproof layer under extreme conditions, the infiltrating water will be blocked by the sealing strip, preventing it from entering the interior side through capillary penetration, thus physically improving the multi-layered waterproof reliability of the installation joint.

[0012] Optionally, in step S4, the time window during which the polyurethane foam material is in the plastic state is within 10 to 15 minutes after the polyurethane foam material is filled; the set area includes the installation seam area corresponding to the bottom of the window frame and the installation seam area corresponding to the downward return area extending 20cm upward from the bottom on both sides of the window frame; the depth of the continuous reserved groove is at least 3cm recessed inward from the opening of the installation seam.

[0013] By adopting the above technical solution, the time window for the pressing and shifting operation is precisely limited to within 10-15 minutes after the polyurethane foam material is filled. This utilizes the process window during which the foam material has reached a viscosity sufficient to support its own shape but has not yet completely solidified and lost its plasticity. This ensures that the pressing and shifting tool can smoothly move the foam material and that the reserved groove shape remains stable and does not collapse after the tool is withdrawn. It also ensures that the closed-cell skin on the surface of the foam material is not completely cross-linked and hardened during the pressing and shifting process, thus avoiding cracking. At the same time, the area for forming the reserved groove by pressing and shifting is limited to the installation seam at the bottom of the window frame and the downward return area extending 20cm upward from the bottom on both sides. This is specifically targeted at the bottom of the window frame, which is a critical stress area for vertical load-bearing and rainwater runoff, and is also a high-risk area for water immersion. The downward return area covers the typical height at which rainwater capillarily climbs upward along the sides of the frame. The pre-reserved groove is recessed inward by at least 3cm from the opening of the installation joint. This ensures that the filled polyurethane waterproof mortar has sufficient structural thickness to form an effective rigid support layer and impact barrier, while also preventing the remaining foam core layer in the middle of the installation joint from being too thin due to an excessively deep pre-reserved groove, which would weaken the thermal insulation effect. The three parameters of time window, area selection, and depth limit work together to achieve the optimal technical match of the pre-groove process during the plastic period of the foam adhesive in the entire installation joint construction system.

[0014] Optionally, in step S2, the load-bearing pad is made of a heat-insulating material with a low thermal conductivity, and the load-bearing pad has a hollow structure so that the polyurethane foam material can be filled through it, maintaining the continuity of the foam material layer in the installation seam.

[0015] By adopting the above technical solution, the load-bearing pad at the bottom of the window frame, while fulfilling its vertical support function, also avoids forming localized thermal bridges at the pad location due to its low thermal conductivity insulation material. Heat is not concentrated and conducted between the window frame and the main structure through the pad. The perforated structure on the pad allows the polyurethane foam material to penetrate through the internal gaps during filling, maintaining the physical continuity of the foam material layer at the load-bearing pad location. This prevents the formation of uninsulated cavities in the installation joint caused by solid pads blocking the foam material, ensuring consistent and continuous thermal insulation and sealing performance throughout the entire installation joint.

[0016] Optionally, in step S4, while the pressing tool presses and moves the polyurethane foam material, an interlocking cavity is formed at the bottom of the continuous reserved groove; in step S5, the polyurethane waterproof mortar fills the interlocking cavity, and after curing, it forms a mechanical interlocking structure with the polyurethane foam material.

[0017] By adopting the above technical solution, the pressing and moving tool can simultaneously press and move polyurethane foam material and form an interlocking cavity with a groove opening width smaller than the groove bottom width at the bottom or side wall of the continuous reserved groove. This inverted concave cavity structure allows the subsequently filled polyurethane waterproof mortar to form a structural mechanical interlock with the foam material after curing, unlike interface connections that rely solely on chemical bonding or friction bonding. During the long-term service of the window frame, even if temperature changes cause differential expansion and contraction between the two materials, the mechanically interlocking inverted concave structure effectively prevents the mortar layer from detaching or peeling from the pre-reserved groove in the foam material, ensuring that the rigid waterproof layer and the elastic foam core layer always maintain overall synergistic stress. The interlocking cavity is formed in a one-time, non-destructive manner in the plastic state of the foam material before it is fully cured, without the need for subsequent cutting, chiseling, or grinding. This maintains the integrity of the closed-cell waterproof structure on the surface of the foam material and achieves peel and shear resistance far superior to that of a planar bonding interface. This process concept of actively constructing a mechanically interlocking interface during the plastic period of the foam material utilizes the short-term plasticity of the foam material during curing, which is fundamentally different in technical path and interface formation mechanism from the subsequent processing method of cutting and grooving after the foam is fully cured. It can achieve a synergistic structural effect of flexible material wrapping a rigid interlock.

[0018] Optionally, the pressing and moving tool includes a moving module and a fixed module. The fixed module can abut against the side of the window frame to define the pressing and moving reference, and the front end of the fixed module is connected to an expansion member through an elastic sheet. The expansion member is provided with an oblique guide portion. The moving module is slidably connected to the fixed module, and the front end of the moving module abuts against the oblique guide portion. When the moving module moves toward the oblique guide portion, it can drive the expansion member inserted into the polyurethane foam material to open, so as to form the interlocking cavity with a dovetail structure inside the polyurethane foam material.

[0019] By adopting the above technical solution, the pressing tool abuts against the side of the window frame via a fixed module, providing a precise pressing depth reference for the movement of the moving module. This ensures consistency in the dimensions of the pre-formed groove and interlocking cavity formed with each pressing operation. When the conical part moves towards the expansion member, it triggers the expansion member to open, forming an interlocking cavity inside the foamed material. After this process, the tool retracts and then withdraws, avoiding damage to the shape of the formed cavity during withdrawal. This step-by-step action and sequential control method ensures that the forming and demolding processes of the interlocking cavity in a soft state do not interfere with each other. It guarantees that the pressing of the pre-formed groove and the lateral expansion forming of the interlocking cavity can be completed in one go using a single tool during the plasticity period of the foamed material. The process operation is continuous and efficient, and the formed cavity wall is intact and undamaged, providing reliable forming quality for subsequent mortar filling and mechanical interlocking.

[0020] Optionally, a waterproofing reinforcement step for the inside corners is also included: waterproof tape is applied to the inside and outside corners of the bottom of the window frame, respectively, so that the waterproof tape completely covers the bottom material of the window frame and the outer supporting waterproof mortar layer.

[0021] By adopting the above technical solution, waterproof tape is applied to the inner and outer corners at the bottom of the window frame, ensuring complete coverage of the interface between the window frame substrate and the outer supporting waterproof mortar layer. This corner reinforcement method covers any construction micro-joints or interface gaps that may exist between the outer mortar layer and the window frame substrate in this area, preventing rainwater from seeping laterally along the interface into the interior or penetrating into the installation joint, thus preventing the foam material from becoming damp and further improving the waterproof reliability of the weak area at the bottom of the installation joint.

[0022] This application also provides a composite installation joint structure for a residential window frame, disposed between the outer edge of the window frame and the wall surface of the main structural opening, comprising, from the inside out: Point-bearing structural components, including load-bearing pads and positioning pads, are spaced out and locked between the outer periphery of the window frame and the opening of the main structure; A continuous elastic thermal insulation buffer layer is filled in the middle of the composite installation joint of the residential window frame and in the gaps between the point-load-bearing structural members. The continuous elastic thermal insulation buffer layer is a polyurethane foam layer that has been compressed inward and made dense during the plastic period. The exposed surface of the polyurethane foam layer away from the window frame is a complete waterproof closed-cell skin layer that has not been mechanically cut, and the closed-cell skin layer is recessed into the composite installation joint of the residential window frame to form a continuous reserved groove. The outer supporting waterproof layer is formed by casting polyurethane waterproof mortar mixed with micro-expansion agent and tightly adhering to and filling the reserved groove formed by the complete waterproof closed-cell skin layer.

[0023] By adopting the above technical solution, the composite installation joint between the window frame and the main structure opening is spatially arranged with point-bearing structural members, a continuous elastic thermal insulation buffer layer, and an outer supporting waterproof layer, arranged sequentially from the inside to the outside. The point-bearing structural members transfer the weight of the window frame and external loads to the main structure in a point-like manner, providing stable and intermittent rigid support for the window frame and avoiding the overall thermal bridging effect caused by continuously laying rigid materials along the bottom surface of the entire installation joint. The continuous elastic thermal insulation buffer layer wraps around the outer edge of the point-bearing structural members, using a dense polyurethane foam layer that has been compressed inward during the plastic period to form an uninterrupted thermal insulation wrap between the point structural members, ensuring that there are no exposed cold bridge channels around the installation joint. The exposed surface of the foam layer away from the window frame is a complete waterproof closed-cell skin layer that has not been mechanically cut. Its surface is dense and recessed into the installation joint to form a continuous reserved groove. This space provides a precise filling interface and interlocking foundation for the outer supporting waterproof layer. The outer side is formed by casting polyurethane waterproof mortar mixed with micro-expansion agent, which is tightly bonded to the foam layer through the undamaged closed-cell skin interface to form a non-cutting connection. From the structural level, this ensures that the installation joint has comprehensive performance of thermal insulation, load-bearing support, waterproofing and seepage prevention and long-term durability.

[0024] Optionally, the continuous reserved groove formed by the retreat of the continuous elastic thermal insulation buffer layer and the outer supporting waterproof layer filled in the continuous reserved groove are continuously set on the outer side of the horizontal bottom of the window frame and extend upward to the vertical frame on the left and right sides of the window frame, together forming a U-shaped flexible and rigid combined outer water-blocking skirt structure that covers the area of ​​risk of back leakage under the composite installation joint of the residential window frame.

[0025] By adopting the above technical solution, the continuous reserved groove formed by the retreat of the continuous elastic thermal insulation buffer layer and the outer supporting waterproof layer filled therein are continuously set on the outer side of the horizontal bottom of the window frame, and extend upwards to the longitudinal edges on the left and right sides of the window frame, forming a U-shaped flexible-rigid combined outer water-blocking skirt structure covering the lower corner of the window frame. This U-shaped structure uses the continuous rigid waterproof mortar at the bottom as the horizontal support base, and the rigid mortar skirts extending upwards on both sides as vertical water-blocking flanges, guiding the impact force and penetration path of rainwater away from the installation joint opening. At the same time, the foam core layer encased inside maintains the thermal insulation continuity of this area, so that the lower corner area of ​​the frame, which is most susceptible to stress settlement and rainwater runoff, receives comprehensive reinforcement in terms of waterproofing, load-bearing capacity and thermal performance.

[0026] In summary, this application includes at least one of the following beneficial technical effects: This application forms a continuous reserved groove by non-destructive compression during the plasticity period of the foamed material, and fills the groove with micro-expansion polyurethane waterproof mortar, forming a flexible-rigid composite installation joint in which the dense elastic foamed core layer in the middle and the rigid support waterproof layer on the outside work together to bear the force, while taking into account the comprehensive performance of load-bearing stability, waterproof and seepage-proof and thermal break. This application adopts stepless adjustment and leveling of airbags combined with point-type pads for load bearing. The airbags are removed before mechanical fixing, which effectively avoids window frame displacement caused by traditional hammering fixing methods and significantly improves the positioning accuracy of window frame installation. This application creates an interlocking cavity with a groove opening width smaller than the groove bottom width within a continuously reserved groove, thereby forming a mechanical interlocking structure between the waterproof mortar and the foaming material. This significantly enhances the anti-peeling and long-term synergistic stress-bearing capacity of the interface between the two heterogeneous materials. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the construction method for the flexible-rigid composite installation joint of the residential window frame described in this application; Figure 2 This is a three-dimensional structural diagram of the window frame described in this application when it is installed in a wall opening; Figure 3 This is a front view structural diagram of the window frame described in this application when it is installed in a wall opening; Figure 4 This is a structural schematic diagram of the flexible-rigid composite installation joint of the residential window frame described in this application; Figure 5 This is a schematic diagram of the arrangement structure of the outer supporting waterproof layer described in this application; Figure 6 This is a schematic diagram of the arrangement structure of the waterproof tape described in this application; Figure 7 This is a structural schematic diagram of the point-bearing structural member described in this application; Figure 8 This is a schematic diagram of the compression tool described in Embodiment 1 of this application; Figure 9 This is a schematic diagram of the arrangement structure of the compression tool extruding polyurethane foam material as described in Embodiment 1 of this application; Figure 10 This is a schematic diagram of the compression tool described in Embodiment 2 of this application; Figure 11 This is a schematic diagram of the arrangement structure of the compression tool extruding polyurethane foam material as described in Embodiment 2 of this application; Figure 12 This is a schematic diagram of the interlocking cavity described in Embodiment 2 of this application.

[0028] In the diagram: 1. Window frame; 11. Waterproof sealing strip; 2. Main structure; 21. Wall opening; 3. Installation joint; 4. Waterproof tape; 5. Point-load-bearing structural component; 51. Load-bearing pad; 52. Positioning pad; 53. Clearance groove; 6. Adjustable airbag; 7. Continuous elastic thermal insulation buffer layer; 71. Closed-cell skin layer; 72. Interlocking cavity; 8. External support waterproof layer; 9. Pressing and moving tool; 91. Fixed module; 911. Elastic sheet; 912. Expansion member; 913. Limiting part; 914. Angled guide part; 92. Moving module; 921. Conical part; 94. Flexible part. Detailed Implementation

[0029] The technical solutions of various embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Example 1

[0030] Reference Figures 1 to 4 This application discloses a construction method for a flexible-rigid composite installation joint in a residential window frame, including the following steps: S1, Base treatment and positioning: Clean the base of the main structure 2 where the window frame 1 is installed, use high-pressure air to blow away impurities and dust in the opening, and mark the window position line at the wall opening 21 of the main structure 2. S2, Precise positioning and point-bearing fixing of window frame: Place window frame 1 into wall opening 21 for adjustment and positioning, and place load-bearing pads 51 and positioning pads 52 at the bottom and side gaps corresponding to the predetermined fixing holes of window frame 1 respectively; so that a point-bearing limiting structure and a circumferential continuous installation seam 3 are formed between window frame 1 and wall opening 21; in order to prevent the pads from shifting during subsequent construction, anti-slip textures can be preset on the contact surface between the pads and window frame or opening or temporary fixing adhesive points can be used. S3, Continuous filling of foam material: Continuously fill the circumferentially continuous installation seam 3 with single-component moisture-curing polyurethane foam material. The foam material is flame-retardant, and after curing, the closed-cell rate is greater than 88%, and the thermal conductivity is about 0.04 W / m·K. When filling, the spray gun moves at a uniform speed along the length of the installation seam 3 to ensure that the foam material fully fills the entire installation seam 3. S4, Pre-formed groove during the plastic period of foam material: When the polyurethane foam material is filled and is in a plastic state that is not fully cured, the pressing tool 9 is used to press and move the polyurethane foam material in the set area of ​​the circumferential continuous installation seam 3 towards the middle of the installation seam 3 to increase the density of the polyurethane foam material in the middle of the installation seam 3, and to press and form a continuous reserved groove without damage on the outside of the pressing area. During the pressing and moving process, the integrity of the closed-cell structure of the outer surface layer of the polyurethane foam material after curing is maintained. S5, Rigid Support Waterproof Layer Construction: Polyurethane waterproof mortar mixed with micro-expansion agent is filled into the continuous reserved groove. After curing, it forms an outer support waterproof layer 8. The outer support waterproof layer 8 and the continuous elastic thermal insulation buffer layer 7 formed by polyurethane foam material in the middle of the installation joint 3 are combined and work together to support the positioning window frame 1. Among them, the micro-expansion agent is a concrete expansion agent, and its dosage is 4% to 8% of the cement mass in the waterproof mortar to compensate for the shrinkage during the curing process of the mortar.

[0031] Reference Figures 1 to 4 After step S5 is completed, a waterproofing reinforcement step can be performed at the inner and outer corners: waterproof tape 4 is pasted on the inner and outer corners at the bottom of the window frame 1. The waterproof tape 4 is butyl waterproof tape with a thickness of 1mm and a width of 50mm. The waterproof tape 4 completely covers the bottom material of the window frame 1 and the outer supporting waterproof mortar layer to further seal the interface micro-cracks in this area.

[0032] Specifically, refer to Figures 2 to 4 After step S1 and before step S2, a first sealing layer can be added: a waterproof sealing strip 11 is pre-attached around the window frame 1; the waterproof sealing strip 11 is made of EPDM material, with a width of 30mm and a thickness of 2mm. Its width is less than the width of the window frame 1 along the wall thickness direction of 80mm, and the waterproof sealing strip 11 is attached to the middle position of the joint area between the window frame 1 and the wall opening 21 to form a water-blocking physical barrier layer; the outer side of the waterproof sealing strip 11 in the thickness direction is completely covered and wrapped by polyurethane foam material in the subsequent step S3, and the two form a layered sealing structure.

[0033] Reference Figures 2 to 4In step S2, the process of adjusting and positioning the window frame 1 within the wall opening 21 is as follows: First, an adjusting airbag 6 is placed at the bottom of the wall opening 21. After the window frame 1 is placed into the wall opening 21, adjusting airbags 6 are placed between the left and right sides of the window frame 1 and the wall opening 21. The adjusting airbags 6 are made of three-layer composite fiber woven material, with a working pressure of 0.05 to 0.2 MPa. The bottom and side adjusting airbags 6 are adjusted by inflating or deflating them, and the vertical and horizontal control lines projected by the laser plumb line are used to align the window frame 1. Perform stepless adjustment and leveling until the window frame 1 reaches the design requirements for horizontality and verticality; place load-bearing pads 51 and positioning pads 52 at the bottom and side gaps corresponding to the predetermined fixing holes of the window frame 1. After the pads are in place, vent and remove the adjusting airbags 6 located at the bottom and sides, and then perform mechanical fixing between the window frame 1 and the main structure 2; the first drilling position of the mechanical fixing is 150mm away from the corner of the window frame 1, and the spacing between the remaining adjacent fixing holes is 500mm. Stainless steel expansion bolts are inserted into the fixing holes to anchor into the main structure 2.

[0034] Reference Figure 4 and Figure 6 In step S4, the time window for the polyurethane foam material to be in a plastic state is within 10 to 15 minutes after the polyurethane foam material is filled. This time window is determined based on the standard working conditions of an ambient temperature of 25°C and a relative humidity of 50%. If the ambient temperature is lower than 15°C, the operation window can be appropriately extended to 20 minutes. The pressing and moving operation of the pressing and moving tool 9 must be completed within this time window. The set area includes the installation joint area corresponding to the bottom of the window frame 1 and the installation joint area corresponding to the downward return area extending 20cm from the bottom on both sides of the window frame 1. This area is the vertical load-bearing concentration area of ​​the window frame installation joint and the high-incidence area of ​​rainwater runoff. The depth of the continuous reserved groove is recessed inward by at least 3cm from the opening of the installation joint 3 to ensure that the filled polyurethane waterproof mortar has sufficient structural thickness to form an effective rigid support layer.

[0035] Reference Figure 7 The load-bearing pad 51 is made of PP material and measures 80mm×30mm×5mm. It has a hollow structure to ensure the circumferential continuity of the foam material during filling. The positioning pad 52 is made of hard nylon material and measures 60mm×20mm×3mm. The self-weight of the window frame 1 and the external load are transferred to the main structure 2 in a point-like manner through the point-bearing structural member 5. Both the load-bearing pad 51 and the positioning pad 52 have hollow structures, and the end near the end that abuts against the window body is provided with a relief groove 53 to accommodate the waterproof sealing strip 11.

[0036] Reference Figures 8 to 9The pressing tool 9 is a T-shaped rigid support with a limiting part 913 on one side plane, which can abut against the side of the window frame 1 to limit the pressing depth reference; and the pressing tool 9 can be provided with a flexible part 94 at the end that abuts against the polyurethane foam material to maintain the integrity of the closed-cell structure of the outer surface layer of the polyurethane foam material after curing during the pressing process.

[0037] The implementation principle of this embodiment is as follows: Utilizing the 10-15 minute plasticity window after the polyurethane foam material is filled, a pressing tool is used to non-destructively press the foam material from the bottom and lower areas of the window frame towards the center of the installation joint. While maintaining the integrity of the closed-cell structure of the outer layer of the foam material, a continuous pre-reserved groove is actively constructed on the outside. Then, polyurethane waterproof mortar mixed with a micro-expansion agent is filled into the groove. After the mortar cures, it forms a rigid supporting waterproof outer layer, which works in conjunction with the dense elastic foam core layer in the center of the installation joint to achieve comprehensive functions of load-bearing, waterproofing, heat insulation, and crack resistance. Example 2

[0038] Reference Figures 10 to 12 The difference between this embodiment and embodiment one is that in step S4, while the pressing tool 9 is pressing the polyurethane foam material, it can form an interlocking cavity 72 at the bottom of the continuous reserved groove; in step S5, the polyurethane waterproof mortar fills the interlocking cavity 72, and after curing, it forms a mechanical interlocking structure with the polyurethane foam material.

[0039] Reference Figures 10 to 12 The pressing and shifting tool 9 includes a moving module 92 and a fixed module 91. The fixed module 91 is a T-shaped rigid support with a limiting part 913 on one side plane, which can abut against the side of the window frame 1 to limit the pressing and shifting depth reference. Both sides of the front end of the fixed module 91 are connected to the expansion member 912 through elastic sheets 911. The elastic sheets 911 are 65Mn spring steel sheets with a thickness of 0.5mm. The expansion member 912 is composed of two steel blocks forming a right angle triangle, with the inclined side near the inner side forming an inclined guide part 914. The moving module 92 is slidably connected to the fixed module 91, and the front end of the moving module 92 abuts against the inclined guide part 914. When the moving module 92 is pressed and moved towards the inclined guide part 914, it can drive the insertion into the foam material. The expansion member 912 of the part opens to form an interlocking cavity 72 with a dovetail structure inside the polyurethane foam material; the maximum width of the bottom of the interlocking cavity 72 formed after the expansion member 912 opens is 8mm, and the width of the opening is 3mm; after the pressure on the moving module 92 is released, the expansion member 912 automatically retracts under the elastic force of the elastic sheet 911, and disengages from the side wall of the formed interlocking cavity 72, so as to avoid damage to the cavity structure when the tool is withdrawn; and the ends of the moving module 92 and the fixed module 91 that abut against the polyurethane foam material can be provided with rubber flexible parts 94 to maintain the integrity of the closed-cell structure of the outer surface layer of the polyurethane foam material after curing during the pressing and moving process.

[0040] The implementation principle of this embodiment is as follows: when the front end of the pressing tool is equipped with an expansion component, an interlocking cavity can also be formed on the side wall or bottom of the reserved groove. The interlocking cavity is formed in one go without damage in the plastic state before the foam material is fully cured. No subsequent cutting, chiseling or grinding is required. This not only maintains the integrity of the closed-cell waterproof structure on the surface of the foam material, but also obtains peel resistance and shear resistance far superior to the planar bonding interface. Example 3

[0041] Reference Figures 3 to 5 This application also discloses a composite installation joint structure for a residential window frame. This structure can be formed by the construction method described in the above embodiments and is set between the outer edge of the window frame 1 and the wall surface of the opening of the main structure 2.

[0042] Reference Figures 3 to 5 The composite installation joint structure of the residential window frame consists of, from the inside out, a point-bearing structural member 5, a continuous elastic thermal insulation buffer layer 7, and an outer supporting waterproof layer 8.

[0043] Reference Figures 3 to 5 The point-bearing structural component 5 includes a load-bearing pad 51 and a positioning pad 52, which are spaced and clamped between the outer periphery of the window frame 1 and the opening of the main structure 2.

[0044] Reference Figures 3 to 5 The continuous elastic thermal insulation buffer layer 7 is filled in the middle of the composite installation joint of the residential window frame and fills the gap between each point-bearing structural member 5. The continuous elastic thermal insulation buffer layer 7 is a polyurethane foam layer that has been compressed inward during the plastic period. Its exposed surface away from the window frame 1 is a complete waterproof closed-cell skin layer 71 that has not been mechanically cut. The closed-cell skin layer 71 is recessed into the composite installation joint of the residential window frame to form a continuous reserved groove.

[0045] Reference Figures 3 to 5 The outer supporting waterproof layer 8 is formed by casting polyurethane waterproof mortar mixed with micro-expansion agent and is tightly filled into the reserved groove formed by the complete waterproof closed-cell skin layer 71; the outer supporting waterproof layer 8 and the inner wall of the reserved groove are bonded through a natural interface formed without cutting; it should be noted that in a residential window frame composite installation joint structure, the polyurethane waterproof mortar can form a mechanical interlocking structure with the polyurethane foam material after curing.

[0046] Reference Figures 3 to 5The continuous reserved groove formed by the retreat of the continuous elastic thermal insulation buffer layer 7 and the outer supporting waterproof layer 8 filled in the continuous reserved groove are continuously set on the outer side of the horizontal bottom of the window frame 1 and extend upward to the longitudinal frame on both sides of the window frame 1, together forming a U-shaped flexible and rigid combined outer water-blocking skirt structure that covers the area of ​​risk of leakage under the composite installation joint of the residential window frame; the U-shaped structure extends from the bottom center of the window frame to both sides to 20cm up, forming a continuous closed rigid protection for the lower corner area where rainwater leakage is most concentrated.

[0047] The implementation principle of this embodiment is as follows: the installation joint between the window frame and the wall opening is constructed of three layers: a point-bearing structural component, a continuous elastic thermal insulation buffer layer, and an outer supporting waterproof layer. The point-bearing structural component provides intermittent rigid support, and the continuous elastic thermal insulation buffer layer fills the gaps between the pads with dense foam to eliminate cold bridge paths. The outer surface of the foam layer is an uncut, complete closed-cell skin layer that recedes into the joint to form a reserved groove, providing a precise filling interface and interlocking foundation for the outer mortar layer. The outer rigid mortar layer and the foam core layer are tightly bonded through the uncut interface to form a flexible-rigid composite structure. In the bottom and lower areas of the window frame, the reserved groove and the mortar layer extend continuously to form a U-shaped skirt structure, providing comprehensive waterproofing and load-bearing reinforcement to this high-risk area.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. A construction method for a flexible-rigid composite installation joint in a residential window frame, characterized in that, Includes the following steps: S1, Base treatment and positioning: Clean the base of the main structure (2) where the window frame (1) is installed, and lay out the window position line at the wall opening (21) of the main structure (2); S2, Precise positioning and point-bearing fixing of window frame (1): Place the window frame (1) into the wall opening (21) for adjustment and positioning, and place load-bearing pads (51) and positioning pads (52) at the bottom and side gaps corresponding to the predetermined fixing holes of the window frame (1); so that a point-bearing limiting structure and a circumferential continuous installation seam (3) are formed between the window frame (1) and the wall opening (21). S3, Continuous filling of foam material: Continuously filling polyurethane foam material into the circumferentially continuous installation seam (3); S4, Pre-formed groove during the plastic period of foam material: When the polyurethane foam material is filled and is in a plastic state that is not fully cured, the polyurethane foam material in the set area of ​​the circumferential continuous installation seam (3) is pressed and moved towards the middle of the installation seam (3) using a pressing and moving tool (9) to increase the density of the polyurethane foam material in the middle of the installation seam (3), and a continuous reserved groove is formed without damage on the outside of the pressing and moving area. During the pressing and moving process, the integrity of the closed-cell structure of the outer surface layer of the polyurethane foam material after curing is maintained. S5, Rigid support waterproof layer construction: Polyurethane waterproof mortar mixed with micro-expansion agent is filled into the continuous reserved groove, and after curing, an outer support waterproof layer (8) is formed. The outer support waterproof layer (8) is combined with the continuous elastic thermal insulation buffer layer (7) formed by the polyurethane foam material in the middle of the installation joint (3) and works together to support the positioning window frame (1).

2. The construction method for the flexible-rigid composite installation joint of residential window frames according to claim 1, characterized in that, In step S2, the process of placing the window frame (1) into the wall opening (21) for adjustment and positioning specifically includes: placing an adjustment airbag (6) at the bottom of the wall opening (21); after placing the window frame (1) into the wall opening (21), placing adjustment airbags (6) between the left and right sides of the window frame (1) and the wall opening (21); adjusting the bottom and side adjustment airbags (6) by inflating or deflating, and using vertical and horizontal control lines to steplessly adjust and level the window frame (1); after placing the load-bearing pad (51) and the positioning pad (52) at the bottom and side gaps corresponding to the predetermined fixing holes of the window frame (1), removing the bottom and side adjustment airbags (6), and mechanically fixing the window frame (1) to the main structure (2).

3. The construction method for the flexible-rigid composite installation joint of residential window frames according to claim 1, characterized in that, After step S1 and before step S2, the method further includes: setting a first sealing layer: a waterproof sealing strip (11) is pre-attached around the window frame (1). The width of the waterproof sealing strip (11) is smaller than the width of the window frame (1) along the wall thickness direction. The waterproof sealing strip (11) is attached to the inner side or middle of the joint area between the window frame (1) and the wall opening (21) to form a water-blocking physical barrier layer. The outer side of the waterproof sealing strip (11) in the thickness direction is completely covered and wrapped by the polyurethane foam material in the subsequent step S3.

4. The construction method for the flexible-rigid composite installation joint of a residential window frame according to claim 1, characterized in that, In step S4, the time window during which the polyurethane foam material is in the plastic state is within 10 to 15 minutes after the polyurethane foam material is filled; the set area includes the installation seam (3) area corresponding to the bottom of the window frame (1) and the installation seam (3) area corresponding to the downward return area extending 20cm upward from the bottom on both sides of the window frame (1); the depth of the continuous reserved groove is at least 3cm recessed inward from the opening of the installation seam (3).

5. The construction method for the flexible-rigid composite installation joint of residential window frames according to claim 1, characterized in that, In step S2, the load-bearing pad (51) is made of a heat-insulating material with low thermal conductivity, and the load-bearing pad (51) has a hollow structure so that the polyurethane foam material can be filled through to maintain the continuity of the foam material layer in the installation seam (3).

6. The construction method for the flexible-rigid composite installation joint of a residential window frame according to claim 1, characterized in that, In step S4, while the pressing tool (9) presses and moves the polyurethane foam material, it forms an interlocking cavity (72) at the bottom of the continuous reserved groove; in step S5, the polyurethane waterproof mortar fills the interlocking cavity (72), and after curing, it forms a mechanical interlocking structure with the polyurethane foam material.

7. The construction method for flexible-rigid composite installation joints of residential window frames according to claim 6, characterized in that, The pressing and moving tool (9) includes a moving module (92) and a fixed module (91). The fixed module (91) can abut against the side of the window frame (1) to define the pressing and moving reference. The first end of the fixed module (91) is connected to an expansion member (912) through an elastic sheet (911). The expansion member (912) is provided with an oblique guide (914). The moving module (92) is slidably connected to the fixed module (91), and the first end of the moving module (92) abuts against the oblique guide (914). When the moving module (92) moves toward the oblique guide (914), it can drive the expansion member (912) inserted into the polyurethane foam material to open, so as to form the interlocking cavity (72) with a dovetail structure inside the polyurethane foam material.

8. The construction method for the flexible-rigid composite installation joint of a residential window frame according to claim 1, characterized in that, It also includes a waterproofing step for the inner corners: waterproof tape (4) is pasted on the inner and outer corners of the bottom of the window frame (1) respectively, so that the waterproof tape (4) completely covers the bottom material of the window frame (1) and the outer supporting waterproof mortar layer.

9. A composite installation joint structure for a residential window frame, disposed between the outer edge of the window frame (1) and the wall surface of the opening in the main structure (2), characterized in that, From the inside out, the following are included: The point-bearing structural component (5) includes a load-bearing pad (51) and a positioning pad (52), which are spaced apart and clamped between the outer periphery of the window frame (1) and the opening of the main structure (2); A continuous elastic thermal insulation buffer layer (7) is filled in the middle of the composite installation joint (3) of the residential window frame (1) and also fills the gap between each of the point-bearing structural members (5). The continuous elastic thermal insulation buffer layer (7) is a polyurethane foam layer that has been compressed and compacted inward during the plastic period. The exposed surface of the polyurethane foam layer away from the frame of the window frame (1) is a complete waterproof closed-cell skin layer (71) that has not been mechanically cut. The closed-cell skin layer (71) is recessed into the composite installation joint (3) of the residential window frame (1) to form a continuous reserved groove. The outer supporting waterproof layer (8) is formed by casting polyurethane waterproof mortar mixed with micro-expansion agent and is tightly fitted and filled into the reserved groove formed by the complete waterproof closed-cell skin layer (71).

10. The composite installation joint structure for residential window frames according to claim 9, characterized in that, The continuous reserved groove formed by the retreat of the continuous elastic thermal insulation buffer layer (7) and the outer supporting waterproof layer (8) filled in the continuous reserved groove are continuously set on the outer side of the horizontal bottom of the window frame (1) and extend upward to the longitudinal frame on the left and right sides of the window frame (1), together forming a U-shaped flexible and rigid combined outer water-blocking skirt structure covering the leakage risk area under the composite installation joint (3) of the residential window frame (1).

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