A wall beam replacement method for large-bay reconstruction of precast slab brick buildings
By using the method of through-and-through clamping of supporting beams and pressure injection of structural adhesive, combined with beam pad rebar tying, the problems of structural instability and construction risks in the renovation of precast brick-concrete buildings are solved, achieving a safe, economical and efficient renovation effect, which is suitable for the spatial layout of modern residences and shops.
Patent Information
- Application Number
- CN202610666183.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-14
- Publication Date
- 2026-07-10
AI Technical Summary
The existing methods for replacing load-bearing walls with beams and replacing beams with columns do not address the issues of poor rigidity and easy cracking of precast slabs. This leads to safety hazards such as increased slab deflection, slab surface cracking, and misalignment of slab joints after the walls are demolished. The construction period is long, the disturbance to residents is serious, and there are also problems of high risk and high cost of non-standard renovations.
A new load-bearing beam is formed by using a method of through-and-clamping support beams, pressure injection of structural adhesive, and rebar anchoring in the beam pads. This ensures a reliable connection between the old and new structures. By adopting a construction procedure of first supporting the beams, then installing them, and finally dismantling the walls in sections, settlement is monitored, reducing the amount of wet work and the construction period.
It effectively avoids cracking and uneven settlement of precast slabs, improves structural safety and seismic stability, reduces construction risks and noise pollution, is suitable for dense environments in old urban areas, and achieves safe, economical and efficient renovation results.
Smart Images
Figure CN122358890A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building construction, and in particular to a method for replacing wall beams in the renovation of large-span precast brick-concrete buildings. Background Technology
[0002] Many brick-concrete buildings constructed in my country in the 1980s and 1990s adopted a structure of load-bearing walls and prefabricated hollow slabs. The interior load-bearing walls are dense and the space is narrow and fragmented, which cannot meet the modern demand for large open spaces and transparent use, and urgently needs to be renovated.
[0003] The existing processes for replacing load-bearing walls with beams and replacing beams with columns have significant shortcomings: they have not optimized the stress distribution to address the poor stiffness and cracking characteristics of precast slabs, and after the walls are removed, safety hazards such as increased slab deflection, surface cracking, and misalignment of slab joints are likely to occur; construction is mainly carried out with wet work, which is time-consuming and causes serious disturbance to residents; the structural design is not compatible with the precast slab-brick-concrete system, resulting in poor integration of the old and new structures and insufficient seismic resistance and stability; at the same time, there is a contradiction between the high risks of non-standard renovations and the high cost of standard solutions, making it difficult to balance safety, convenience, and economy. Summary of the Invention
[0004] To address the above issues, this invention proposes a wall and beam replacement method for the renovation of large open-plan precast brick-concrete buildings. This method solves the pain points of renovating old brick-concrete and precast brick-concrete buildings. Traditional brick-concrete buildings have dense load-bearing walls and fragmented spaces, which cannot meet the needs of modern residential, commercial, and office buildings for large, open-plan layouts. This invention enables the renovation of large open-plan layouts without partitions.
[0005] This application proposes a method for replacing wall beams in the renovation of large open-plan precast brick-concrete buildings, including the following steps: Openings are made in the brick walls on both sides of the load-bearing wall, and support beams are installed on them respectively. The support beams are made to fit tightly against the two sides of the load-bearing wall, and bolts are used to pass through the two support beams and tighten them. Install a support system at a predetermined distance on both sides of the load-bearing wall to be demolished; A mold is erected at the bottom of the support beam for concrete pouring to form a beam pad between the support beam and the ground. Glue is then pressure-injected between the support beam and the precast roof slab to form a new load-bearing beam. The load-bearing wall below the supporting beam is dismantled in sections, and the bottom sealing plate of the beam is installed. The new load-bearing beam was leveled, filled, and polished smooth, completing the overall renovation.
[0006] Furthermore, before installing the support beam, the process also includes base treatment, removing the wall surfaces on both sides of the load-bearing wall and the decorative layer of the precast panels, cleaning down to the original structural base layer, and ensuring that the bonding and connection surfaces are clean.
[0007] Furthermore, the installation of the support beam includes setting up lifting points on the roof, hoisting the support beam to the top of the load-bearing wall, and adjusting the level of the support beam.
[0008] Furthermore, the support system is provided on both sides of the load-bearing wall, and the distance between each support system and the load-bearing wall is less than or equal to 1000mm. The load-bearing walls of the upper and lower layers are supported simultaneously.
[0009] Furthermore, the beam pad construction includes removing the wall at the beam pad location, tying reinforcing bars to the original load-bearing wall, reserving a pouring opening 100mm above the bottom of the supporting beam, pouring concrete, and curing for a period of time until the concrete solidifies to the required standard.
[0010] Furthermore, during the pressure injection of adhesive between the supporting beam and the precast roof slab, multiple adhesive injection pipes are embedded along the length of the new load-bearing beam to continuously inject the adhesive from one end to the other and cure it for a certain period of time.
[0011] Furthermore, the curing time of the colloid is greater than or equal to 2 days.
[0012] Furthermore, when dismantling the load-bearing wall below the support beam in sections, it should be done in sections and in small increments, and each section should be sealed off during the dismantling process; first, dismantle the wall 100-200mm below the support beam, then install the bottom sealing plate of the beam and weld it to the support beam; use steel wedges to tighten the gap between the sealing plate and the lower wall, and proceed section by section.
[0013] Furthermore, the load-bearing wall is divided into sections of 1000-2000mm in the width direction.
[0014] Furthermore, after the segmented dismantling, the settlement of the support beams needs to be monitored. Once the settlement value meets the specifications, the support system should be dismantled layer by layer. If the settlement is abnormal, it should be re-measured and reinforced immediately.
[0015] The beneficial effects of this invention are as follows: For the precast slab-brick-concrete composite system, the through-and-through clamping of the two-sided support beams, the pressure injection of structural adhesive, and the rebar tying of the beam pads ensure a reliable combination of the old and new structures, eliminating the hidden dangers of secondary cracking and uneven settlement of the walls, effectively avoiding problems such as cracking of precast slabs, increased deflection, and misalignment of slab joints, and significantly improving structural safety and seismic stability; the construction process is controllable and settlement can be monitored by first supporting the beams, then installing the beams, and finally dismantling the walls in sections, resulting in low safety risks throughout the process and solving the problems of chaotic load transfer and easy collapse in traditional renovation processes; the use of wall-beam replacement technology greatly reduces the amount of wet work, shortens the construction period, reduces noise and dust pollution, reduces interference to surrounding residents, and is suitable for construction in dense environments in old urban areas; the structure is simple, the materials are standardized, the construction is convenient, and the overall cost is lower, meeting the needs of safe, economical, and efficient renovation of old houses; load-bearing walls can be safely removed to achieve a large open-plan layout, with a transparent and flexible space, suitable for the multi-functional use requirements of modern residences, shops, offices, etc. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A flowchart illustrating a method for replacing wall beams in the renovation of a large-span precast brick-concrete building. Figure 2 A schematic diagram of the installation structure for supporting beams; Figure 3 This is a schematic diagram of the supporting system. Figure 4 A schematic diagram showing the structural details of the support system and the roof support; Figure 5 This is a schematic diagram of the beam pad installation structure; 1. Support beam; 11. Through bolt; 12. Beam bottom sealing plate; 2. Load-bearing wall; 21. Load-bearing wall to be demolished; 22. Load-bearing wall to be retained; 3. Beam pad; 4. Support system; 41. Top support; 5. Roof; 6. Brick wall. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other implementations obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. In the various drawings, the same elements are represented by the same or similar reference numerals, and for clarity, the various parts in the drawings are not drawn to scale.
[0019] See Figure 1 This application presents a flowchart illustrating a method for replacing wall beams in the renovation of large open spaces in precast brick-concrete buildings, comprising the following steps: S001. Openings are made in the brick walls on both sides of the load-bearing wall, and support beams are installed on them respectively, so that the support beams are tightly attached to the two sides of the load-bearing wall. Bolts are used to pass through the two support beams and tighten them.
[0020] See Figure 2As shown, specifically, before installing the support beam in step S001, the process includes base treatment, removing the wall surfaces and precast panel decorative layers on both sides of the load-bearing wall, cleaning down to the original structural base layer, and ensuring the bonding and connection surfaces are clean. Holes are pre-drilled in the brick wall where the support beam will be installed, and openings are made in the brick walls on both sides of the support beam using a cutting machine, pneumatic hammer, etc., ensuring the openings do not damage the load-bearing wall. Specifically, the installation of the support beam includes setting up lifting points on the roof, hoisting the support beam to the top of the load-bearing wall, and adjusting the support beam to be horizontal. A gantry crane, hoist, jacks, etc., are used to place the support beam at the opening, and the vertical position of the support beam is finely adjusted using jacks at the bottom. Through bolts are used to align and install the support beams on both sides into place. In this embodiment, the support beam is a 32B Q355B channel steel, and the horizontal spacing between adjacent through bolts is 300mm and the vertical spacing is 180mm.
[0021] S002. Install a support system at a predetermined distance on both sides of the load-bearing wall to be demolished.
[0022] See Figure 3 , 4 As shown, specifically, support systems are installed on both sides of the load-bearing wall, with each support system at least 1000mm away from the load-bearing wall. Supports are erected simultaneously on the upper and lower load-bearing walls. The support systems are constructed using Φ48.3×3 steel pipes, with a spacing of 500mm between adjacent pipe supports and a step distance of 500mm. Top supports are used to support the floor slab at the top of the support systems. Vertical scissor bracing is installed throughout, while horizontal scissor bracing is installed at the bottom, middle, and top of the floor. The starting point of each support system is 1000mm away from the load-bearing wall to be demolished.
[0023] S003. Concrete is poured into a mold at the bottom of the support beam to form a beam pad between the support beam and the ground. Glue is then injected under pressure between the support beam and the inner load-bearing wall to form a new load-bearing beam.
[0024] See Figure 5 As shown, specifically, the construction of the beam pad includes removing the wall at the beam pad location, tying steel bars to connect with the original load-bearing wall, reserving a pouring opening 100mm above the bottom of the supporting beam, pouring concrete, and curing for a period of time until the concrete solidifies to the required standard, with the curing period lasting until the test block strength meets C35.
[0025] Specifically, when injecting adhesive under pressure between the supporting beam and the precast roof slab, multiple injection pipes are embedded along the length of the new load-bearing beam. The adhesive is continuously injected from one end to the other, with the pressure controlled below 200 kg. The adhesive is prepared according to the specified ratio and stirred at low speed. During injection, injection must be done from one end to the other, and skipping or leaking is strictly prohibited. After filling, the injection port is sealed, and the adhesive is cured for a certain period of time. Specifically, the curing time of the adhesive is greater than or equal to 2 days. S004. The load-bearing wall below the supporting beam is dismantled in sections, and the beam bottom sealing plate is installed.
[0026] Specifically, when dismantling the load-bearing wall below the supporting beam in sections, it should be done in small, segmented steps, with each segment sealed off during the dismantling process. First, dismantle the wall 100-200mm below the supporting beam, then install the beam bottom sealing plate and weld it to the supporting beam. Use steel wedges to tighten the gap between the sealing plate and the lower wall, proceeding segment by segment. Specifically, the load-bearing wall should be divided into segments of 1000-2000mm in width. After the wall openings are dismantled in sections, gradually remove the steel wedges, and monitor the settlement of the supporting beam. Once the settlement value meets the specifications, dismantle the supporting system layer by layer. If abnormal settlement is detected, immediately re-measure and reinforce the structure.
[0027] S005. The new load-bearing beam is leveled, filled, and polished to a smooth finish, completing the overall renovation.
[0028] The beneficial effects of this invention are as follows: For the precast slab-brick-concrete composite system, the two-sided support beams are clamped together, structural adhesive is pressure-injected, and the beam pads are reinforced with rebar. The combination of the old and new structures is reliable, eliminating the hidden dangers of secondary cracking and uneven settlement of the wall, effectively avoiding problems such as cracking of precast slabs, increased deflection, and misalignment of slab joints, and significantly improving structural safety and seismic stability. First, support is installed, then beams are installed, and then walls are demolished in sections. The construction process is controllable, settlement can be monitored, and the safety risks are low throughout the process. This solves the problems of chaotic load transfer and easy collapse in traditional renovation processes. The wall-beam replacement process significantly reduces the amount of wet work, has a short construction period, and produces less noise and dust pollution, reducing interference to surrounding residents and making it suitable for construction in dense environments in old urban areas. With its simple structure, standardized materials, and convenient construction, it offers lower overall costs and meets the needs for safe, economical, and efficient renovation of old houses. Load-bearing walls can be safely removed to create a large open-plan layout, making the space transparent and flexible, and suitable for modern residential, commercial, and office use requirements.
[0029] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be noted that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0030] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Finally, it should be noted that the above embodiments are clearly examples for clearly illustrating the invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A method for replacing wall beams in the renovation of large-span precast brick-concrete buildings, characterized in that, Includes the following steps: Openings are made in the brick walls on both sides of the load-bearing wall, and support beams are installed on them respectively. The support beams are made to fit tightly against the two sides of the load-bearing wall, and bolts are used to pass through the two support beams and tighten them. Install a support system at a predetermined distance on both sides of the load-bearing wall to be demolished; A mold is set up at the bottom of the support beam for concrete pouring to form a beam pad between the support beam and the ground. Glue is then pressure-injected between the support beam and the precast roof slab to form a new load-bearing beam. The load-bearing wall below the supporting beam is dismantled in sections, and the bottom sealing plate of the beam is installed. The new load-bearing beam was leveled, filled, and polished smooth, completing the overall renovation.
2. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 1, characterized in that, Before installing the support beams, the process also includes base treatment, removing the wall surfaces on both sides of the load-bearing wall and the decorative layer of the precast panels, cleaning down to the original structural base layer, and ensuring that the bonding and connection surfaces are clean.
3. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 2, characterized in that, The installation of the support beam includes setting up lifting points on the roof, hoisting the support beam to the top of the load-bearing wall, and adjusting the support beam to be horizontal.
4. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 1, characterized in that, The support system is provided on both sides of the load-bearing wall, and the distance between each support system and the load-bearing wall is less than or equal to 1000mm. The support system is erected simultaneously on the upper and lower load-bearing walls.
5. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 4, characterized in that, The construction of the beam pad includes removing the wall at the beam pad location, tying steel bars to the original load-bearing wall, reserving a pouring opening 100mm above the bottom of the support beam, pouring concrete, and curing for a period of time until the concrete has solidified to the required standard.
6. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 1, characterized in that, When injecting adhesive under pressure between the supporting beam and the precast roof slab, multiple injection pipes are embedded along the length of the new load-bearing beam to continuously inject the adhesive from one end to the other and cure it for a certain period of time.
7. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 6, characterized in that, The curing time for the colloid is greater than or equal to 2 days.
8. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 1, characterized in that, When dismantling the load-bearing wall below the support beam in sections, it should be done in small sections and in small increments, and each section should be sealed off during the dismantling process. First, dismantle the wall 100-200mm below the support beam, then install the bottom sealing plate of the beam and weld it to the support beam. Use steel wedges to tighten the gap between the sealing plate and the lower wall, and proceed section by section.
9. The method for wall and beam replacement in the renovation of large-span precast brick-concrete buildings according to claim 8, characterized in that, The load-bearing wall is divided into sections of 1000-2000mm in the width direction.
10. The method for replacing wall beams in the renovation of large-span precast brick-concrete buildings according to claim 8, characterized in that, After the segmented dismantling, once the settlement value meets the specifications, the support system shall be dismantled layer by layer; if the settlement is abnormal, it shall be re-measured and reinforced immediately.