A three-section in-situ replacement construction method for existing doors and windows on a loaded brick wall

Abstract

This invention relates to the field of in-situ replacement technology for doors and windows, specifically disclosing a three-section in-situ replacement method for existing doors and windows on load-bearing brick walls. The method includes the following steps: S1, after removing the original doors and windows, leaving only the wooden lintel bearing the upper load, a vertical support is installed below the middle section of the wooden lintel; S2, after adjusting the length of the vertical support and applying prestress matching the upper load of the wooden lintel, the edge sections of the wooden lintel located on both sides of the vertical support are cut and removed; S3, in-situ steel crossbeams are installed in the area where the wooden lintel has been removed; S4, vertical supports are installed below the edge steel crossbeams, and then the middle section of the wooden lintel is removed; S5, a middle steel crossbeam is installed in the area of ​​the original middle section of the wooden lintel and connected to the edge steel crossbeams at both ends; S6, after the weld is inspected and approved, the vertical support is removed, completing the in-situ replacement of the wooden lintel with a steel crossbeam. This method, through a "three-section" support replacement approach, can achieve in-situ replacement of door and window systems in situations with existing wooden doors and windows of different widths.

Description

Technical Field

[0001] This invention belongs to the field of in-situ replacement technology for doors and windows, and particularly relates to a three-section in-situ replacement construction method for existing doors and windows on load-bearing brick walls. Background Technology

[0002] Currently, in urban renewal projects in historical and cultural districts, existing wooden doors and windows need to be replaced with other types of windows in situ. However, due to the age of the buildings, there is often a load above the original brick walls of the doors and windows, and no concrete lintels are available. If the load on the brick walls is even greater, without other measures during the replacement process, the wall above the doors and windows may collapse directly after demolition, resulting in a quality accident.

[0003] To address the aforementioned issues, existing technologies allow for direct replacement of existing doors and windows in their original locations when there is no load or the load is small and controlled on a conventional brick wall. However, over time, the brick wall above the doors and windows acts on the relatively weak door and window frames, causing the frames to deflect and making it difficult to open the doors and windows. Therefore, a solution is urgently needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a three-section in-situ replacement construction method for existing doors and windows on load-bearing brick walls. This construction method, through the "three-section" replacement support method, can meet the flexibility in the width of doors and windows, ensure its applicability, and realize the in-situ replacement of door and window systems in the context of existing wooden doors and windows of different widths.

[0005] To achieve the aforementioned objective, the technical solution of the present invention is implemented as follows: a three-section in-situ replacement method for existing doors and windows on a load-bearing brick wall is provided, comprising the following steps: S1. After removing the original doors and windows to be replaced, leaving only the wooden lintels for load-bearing, install vertical supports that can adjust the vertical length below the middle section of the wooden lintels. S2. After adjusting the length of the vertical support and applying prestress that matches the load above the wooden lintel, cut both ends of the middle section of the wooden lintel to divide it into three sections, and remove the wooden lintels at both ends of the middle section. S3. Install edge steel crossbeams in the original location of the area where the original timber lintels have been removed; S4. Install vertical supports below the window opening area where the edge steel lintel extends to the window opening area, and apply prestress matching the roof load before removing the middle section of the wooden lintel. S5. Install a middle section steel lintel in the middle section of the log lintel, and install connectors on the middle section steel lintel to connect it with the edge section steel lintels at both ends; After the connection points between the middle section steel lintel and the end section steel lintels at both ends pass inspection, remove the vertical supports on both sides and replace the wooden lintel with a steel lintel in situ.

[0006] Preferably, in step S5, the connector includes a Z-shaped connector; one end of the Z-shaped connector is inserted into the middle section of the steel through beam and welded thereto, and the other end rests on the side section of the steel through beam and is welded thereto.

[0007] Preferably, in step S5, the middle section steel is welded to the edge section steel via beams on three sides, and finally a U-shaped reinforcing plate with a width of 0.1m is installed for connection, with welding on both sides.

[0008] Preferably, in step S5, the connector further includes a U-shaped reinforcing plate; the U-shaped reinforcing plate is installed at the three-sided welded joint of the middle section steel through beam and the edge section steel through beam, and the two sides of the U-shaped reinforcing plate are welded to the middle section steel through beam and the edge section steel through beam respectively.

[0009] Preferably, the number of vertical supports under the wooden lintels and the edge steel through beams is set to one every 0.5m.

[0010] Preferably, the vertical support is configured as an adjusting rod that can rotate and extend in the vertical direction.

[0011] Preferably, the middle section length of the wooden lintel is at least 1 / 3 of the length of the wooden lintel in the area above the window opening.

[0012] Preferably, the cross-sections of the middle section steel lintel and the edge section steel lintel are consistent with the cross-sections of the wooden lintel.

[0013] The beneficial effects of this invention are reflected in: (1) The method provided by the present invention improves the safety of construction. By adopting a reasonable "three-stage" replacement support, the original doors and windows are replaced in place in two stages. After replacement, they are supported by reliable steel beams, which can ensure their safety during both the replacement process and the use process.

[0014] (2) The method provided by the present invention improves the flexibility of construction. By considering different door and window sizes, the number of vertical supports can be selected in combination with different lengths of the middle / side sections of the "three-section" structure, so as to achieve the effect of replacing the original door and window with different widths in the original position. It has flexibility and applicability.

[0015] (3) The method provided by this invention helps to increase the cultural protection of historical and cultural blocks. Especially in urban renewal projects, particularly for historical and cultural buildings, the "micro-renovation" approach rather than "large-scale demolition and construction" is adopted. This approach not only includes the technology of replacing doors and windows in their original locations, but also "restoring the old as it was", which can further realize cultural protection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the process of replacing the steel beam in the original position of the wooden window according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-section steel beam cross-section connection according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the vertical support rod structure according to an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example like Figure 1-3 As shown: This invention provides a three-section in-situ replacement method for existing doors and windows on load-bearing brick walls. Taking the replacement of wooden lintels on windows as an example, the main steps include: Step 1: Clean and remove the window to be replaced until only the wooden lintel above the window opening remains. Then, install vertical supports in the middle section of the lintel, selecting the number of supports based on the length of the middle section of the lintel, generally 1-2. This method of setting the number of supports according to the existing door and window width provides flexibility and applicability.

[0019] The vertical support is set as a telescopic rod with adjustable bases at both the top and bottom. By rotating the telescopic rod, the length of the vertical support is changed. When supporting the wooden lintel, the adjustable bases of the vertical support are tightened and prestress matching the roof load is applied. Then, the two ends of the middle section of the wooden lintel are cut, thereby disassembling the entire wooden lintel into three sections.

[0020] Because a portion of the wooden lintels at both ends of the middle section is embedded in the wall, the interlocking force between the wall bricks bears part of the load originally applied to the wooden lintels on both sides. Therefore, the load on the middle section of the lintel is lower than the load on the wooden lintels on both sides. Thus, removing the wooden lintels on both sides at this point will not pose a construction risk.

[0021] Step 2: After removing the wooden lintels on both sides, immediately install the steel side beams on both sides in their original positions. The steel side beams have the same cross-section as the wooden lintels. After installation, ensure that the steel side beams are in close contact with the brick walls above and below the original wooden lintels. This will allow them to better bear the load originally placed on the wooden lintels by the original walls, preventing the walls from sinking and cracking later, or from squeezing the replaced windows.

[0022] Step 3: Install vertical supports under the steel lintels on both sides. The number of supports should be selected based on the length of the steel lintel, generally 1-2 supports per 0.5m. After tightening the adjustable base of the vertical supports and applying prestress matching the roof load, remove the middle section of the wooden lintel.

[0023] Step 4: Install a middle section steel lintel in the middle section of the log lintel, and install connectors on the middle section steel lintel to connect it to the edge section steel lintels at both ends.

[0024] In practical applications, the connectors are generally 5mm thick Z-type connectors and 0.1m wide U-shaped reinforcing plates.

[0025] One end of the Z-shaped connector is inserted into the middle section of the steel beam and welded together, while the other end is placed on the upper surface of one end of the edge section of the steel beam and welded together. During installation, the Z-shaped connectors at both ends of the middle section of the steel beam are welded together first. Then, the middle section of the steel beam is installed from the front of the window opening. Once in place, the Z-shaped connectors and the edge section of the steel beam are welded together. Next, the other three connecting surfaces of the middle and edge sections of the steel beam are welded together on three sides. Finally, a 0.1m wide U-shaped reinforcing plate is installed at the three-sided weld joint, and the two sides of the U-shaped reinforcing plate are welded together to strengthen the connection between the middle and edge sections of the steel beam.

[0026] At the connection between the central steel through beam and the side steel through beams, a dual connection node consisting of "Z-shaped connectors + U-shaped reinforcing plates" is used to ensure the integrity of the entire steel through beam. The "Z-shaped connectors" are welded inside the central steel through beam and welded on the side steel through beams to ensure the reliability of the top connection. The butt welding of the central steel through beam and the side steel through beams, along with the welding of the U-shaped reinforcing plates, ensures the reliability of the connection on the other three sides, together forming a reliable connection node between the central steel through beam and the side steel through beams.

[0027] Step 5: After the weld has passed inspection, remove the vertical supports on both sides to safely replace the steel lintel.

[0028] In this way, a three-stage in-situ replacement method for existing doors and windows was proposed, which addresses the situation where there is a load above the existing doors and windows in the brick wall and there is no concrete lintel, thus achieving safe replacement.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for in-situ replacement of existing doors and windows in a three-section configuration on a load-bearing brick wall, characterized in that, Includes the following steps: S1. After removing the original doors and windows to be replaced, leaving only the wooden lintels for load-bearing, install vertical supports that can adjust the vertical length below the middle section of the wooden lintels. S2. After adjusting the length of the vertical support and applying prestress that matches the load above the wooden lintel, cut both ends of the middle section of the wooden lintel to divide it into three sections, and remove the wooden lintels at both ends of the middle section. S3. Install edge steel crossbeams in the original location of the area where the original timber lintels have been removed; S4. Install vertical supports below the window opening area where the edge steel lintel extends to the window opening area, and apply prestress matching the roof load before removing the middle section of the wooden lintel. S5. Install a middle section steel lintel in the middle section of the log lintel, and install connectors on the middle section steel lintel to connect it with the edge section steel lintels at both ends; After the connection point between the middle section steel lintel and the edge section steel lintel is inspected and approved, the vertical supports on both sides are removed, and the wooden lintel is replaced with a steel lintel in its original position.

2. The method for in-situ replacement of existing doors and windows in a load-bearing brick wall in three sections according to claim 1, characterized in that, In step S5, the connector includes a Z-shaped connector; one end of the Z-shaped connector is inserted into the middle section of the steel through beam and welded thereto, and the other end is attached to the side section of the steel through beam and welded thereto.

3. The method for in-situ replacement of existing doors and windows in a load-bearing brick wall in three sections according to claim 2, characterized in that, In step S5, the middle section steel is welded to the edge section steel via beams on three sides, and finally a U-shaped reinforcing plate with a width of 0.1m is installed for connection, with welding on both sides.

4. The method for in-situ replacement of existing doors and windows in a load-bearing brick wall in three sections according to claim 3, characterized in that, In step S5, the connector further includes a U-shaped reinforcing plate; the U-shaped reinforcing plate is installed at the three-sided welded joint of the middle section steel through beam and the edge section steel through beam, and the two sides of the U-shaped reinforcing plate are welded to the middle section steel through beam and the edge section steel through beam respectively.

5. The preparation method of the three-section in-situ replacement construction method for existing doors and windows on a load-bearing brick wall according to claim 1, characterized in that, The number of vertical supports under the wooden lintels and the edge steel through beams is set to one every 0.5m.

6. The preparation method of the three-section in-situ replacement construction method for existing doors and windows on a load-bearing brick wall according to claim 2, characterized in that, The vertical support is configured as an adjusting rod that can rotate and extend in the vertical direction.

7. The preparation method of the three-section in-situ replacement construction method for existing doors and windows on a load-bearing brick wall according to claim 3, characterized in that, The middle section of the wooden lintel is at least one-third the length of the wooden lintel above the window opening.

8. The preparation method of the three-section in-situ replacement construction method for existing doors and windows on a load-bearing brick wall according to claim 7, characterized in that, The cross-sections of the middle section steel lintel and the edge section steel lintel are consistent with the cross-sections of the wooden lintel.

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