Construction precast block for enlarging and reinforcing section of brick-concrete structure concrete plate wall and construction method of construction precast block

Abstract

The invention relates to a construction precast block for enlarging and reinforcing the section of a brick-concrete structure concrete plate wall and a construction method thereof. The construction precast block comprises a main shaft, a precast block body, an adjusting supporting arm and a locking piece. A main shaft penetrates through the center of the precast block, so that an assembling shaft and an adjusting shaft are respectively formed at the inner and outer ends of the precast block; the assembling shaft is used for assembling the main body on a brick-concrete structure; one end of the adjusting supporting arm is rotationally and slidably arranged on the adjusting shaft, and the locking piece locks the sliding and rotating states of the adjusting supporting arm on the adjusting shaft. The adjusting supporting arms rotate and swing so that the height of the ends of the adjusting supporting arms can be adjusted in a small-amplitude adaptive mode compared with the height of the center of a precast block, the adjusting supporting arms can better adapt to modification of a reinforcing mesh, meanwhile, the adjusting supporting arms can slide, the distance between the hanging foundation and the brick-concrete wall face can be adjusted, and V-shaped double-arm lifting is adopted; the plane precision of reinforcing mesh positioning is improved through the stability of a geometric structure, and finally precise control over key parameters such as the mesh hanging distance and the protective layer thickness is achieved.

Description

Technical Field

[0001] This invention relates to the field of structural reinforcement and renovation technology for old buildings, specifically to a precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall and its construction method. Background Technology

[0002] In my country's existing building stock, brick-concrete structures constitute a large proportion. Over long periods of use, these buildings are affected by various factors such as environmental erosion, material degradation, load changes, and evolving functional requirements. Their structural safety and functionality often gradually decline, with some buildings even facing safety hazards. Therefore, reinforcement and renovation to improve safety and functionality are particularly necessary. The residential compound of a certain project involved in this project falls into this category of brick-concrete structures requiring reinforcement and renovation. Among the many methods for strengthening and renovating brick-concrete structures, reinforced concrete slab wall cross-section enlargement is a commonly used and effective approach. This method increases the load-bearing capacity and stiffness of the structure by expanding its cross-sectional dimensions, thereby achieving the purpose of reinforcement. However, in practice, traditional reinforcement methods mainly rely on manual operation, which presents numerous technical problems and seriously affects the reinforcement effect and construction efficiency. Specifically, in the process of shotcreting concrete on walls, the thickness of the sprayed concrete is difficult to control effectively. Due to the subjectivity and instability of manual operation, it is difficult to ensure that the thickness of the sprayed concrete is uniform. If the thickness is too thin, the expected reinforcement strength cannot be achieved; if the thickness is too thick, it will not only cause a large waste of materials and increase project costs, but may also have an adverse effect on the original structure due to excessive weight, and may even affect the usable space of the building. There are several technical drawbacks in the wire mesh installation process. Firstly, the spacing between the wire mesh and the brick-concrete wall is difficult to control precisely. Too large a spacing leads to insufficient adhesion between the concrete and the wall, affecting the overall structural performance; too small a spacing results in the mesh being too close to the wall, failing to fully utilize its reinforcing effect and reducing the overall strength. Secondly, the orientation of the supporting foundation is difficult to adjust, leading to poor mesh stability. If the orientation of the supporting foundation cannot be flexibly adjusted according to the actual wall conditions and construction needs, the mesh is prone to loosening, shifting, or even detaching during construction. This not only affects the quality of subsequent concrete spraying but may also cause safety accidents, increase the probability of rework, reduce construction efficiency, and extend the construction period. Particularly noteworthy is the difficulty in controlling the thickness of the protective layer. The thickness of the protective layer is a key factor in ensuring the effective functioning of the mesh, preventing corrosion, and ensuring structural durability. If the protective layer is not thick enough, the mesh is easily exposed to the external environment and corroded by moisture, oxygen, etc., which reduces its strength and bonding performance with concrete, affecting the service life of the reinforced structure. If the protective layer is too thick, it will increase the amount of concrete used, resulting in material waste. At the same time, it may also cause shrinkage cracks due to excessive concrete thickness, affecting the integrity and safety of the structure.

[0003] In summary, traditional methods for reinforcing brick-concrete slab walls by enlarging their cross-sections have many technical shortcomings during construction, making it difficult to meet the requirements of modern building reinforcement and renovation in terms of construction quality, efficiency, and safety. Therefore, there is an urgent need to find a more advanced and reliable reinforcement technology and construction method to solve the above problems. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall, which effectively solves the problem that the thickness of the sprayed concrete on the wall is difficult to control, and that it is easy to be too thin or too thick, resulting in material waste and poor reinforcement effect.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall, comprising a main shaft, a precast block, an adjusting support arm, and a locking component; the main shaft is provided through the center of the precast block, thereby forming an assembly shaft and an adjusting shaft at the inner and outer ends of the precast block respectively; wherein the assembly shaft is used to assemble the main body onto the brick-concrete structure; one end of the adjusting support arm is rotatably and slidably mounted on the adjusting shaft, and the locking component is used to lock the sliding and rotating states of the adjusting support arm on the adjusting shaft.

[0006] Furthermore, the adjusting component includes an inner positioning nut and an outer locking nut, the adjusting shaft is provided with a threaded section, the inner positioning nut and the outer locking nut are spaced apart on the threaded section, and the adjusting support arm is disposed between the inner positioning nut and the outer locking nut and is locked by adjusting the spacing of the nuts.

[0007] Furthermore, an adjusting sleeve is fixed on the inner positioning nut, the adjusting sleeve is fitted onto the adjusting shaft, and the adjusting support arm is fitted onto the adjusting sleeve.

[0008] Furthermore, positioning sleeves are provided on both sides of the adjusting sleeve, and the adjusting support arm is fitted between the two positioning sleeves. A locking sleeve is provided on the outer locking nut, and the positioning sleeve can be fitted inside the locking sleeve, thereby pressing the adjusting support arm with the locking sleeve.

[0009] Furthermore, the adjusting support arm includes a first support arm and a second support arm, which are arranged in a V-shape, and corresponding grooves are provided at the ends of the first support arm and the second support arm.

[0010] Furthermore, a steel mesh is provided on the main shaft, and the precast blocks are formed by casting based on the steel mesh.

[0011] Furthermore, the first support arm and the second support arm are staggered and have support blocks at their ends, with slots formed on the two support blocks.

[0012] Furthermore, the assembly shaft is provided with limit blocks, and adhesive grooves are formed between the limit blocks.

[0013] A construction method for precast blocks for expanding and reinforcing the cross-section of brick-concrete slab walls, applicable to the aforementioned precast blocks for expanding and reinforcing the cross-section of brick-concrete slab walls, is characterized by comprising the following steps: Step 1: Precast Block Production The spindle is placed into the template so that the bottom of the spindle is inserted into the slot, and then concrete is poured into the template; after demolding, a precast block structure is formed. Step 2, fixing the precast blocks According to the construction drawings, mark the hole positions, drill holes in the brick-concrete wall according to the hole positions, inject anchoring adhesive into the holes, insert the assembly shaft into the holes, and after solidification, fix the precast blocks to the brick-concrete wall. Step 3, adjust the position of the hanging net. Adjust the positions of the inner positioning nut and the outer locking nut to adjust the distance between the mesh and the brick-concrete wall surface. At the same time, adjust the swing amplitude of the adjusting support arm to adjust the support height of the mesh. Then tighten the outer locking nut to lock the position of the mesh. Step 4, Hanging the net Hang the steel mesh in the slot of the adjusting support arm; Step 5, spraying concrete Use a mortar spraying machine to spray concrete onto the wall, then smooth it out.

[0014] Furthermore, the process includes the following steps: after the mesh is installed, the end of the main shaft serves as a fixed base, and the side baffles are fixed to the end of the main shaft or the locking nut to form multiple spraying areas. Concrete is then sprayed onto the wall using a mortar spraying machine. After smoothing, the side baffles are removed, and finally, the gaps are repaired.

[0015] The beneficial effects of the above technical solution are as follows: Addressing the problem of difficulty in controlling the thickness of shotcrete on walls, which can easily result in excessively thin or thick layers, this invention transfers the force of the adjusting support arm to the adjusting shaft by adding an adjusting sleeve, thus avoiding swaying instability caused by the cantilever structure; the nested cooperation of the positioning sleeve and locking sleeve improves stability; and the V-shaped double-arm support utilizes the stability of the geometric structure to improve the planar accuracy of the steel mesh positioning, ultimately achieving precise control of key parameters such as mesh spacing and protective layer thickness, ensuring the quality of reinforcement construction.

[0016] Specifically, in this invention, the adjustable support arm uses rotational swing to allow for slight adaptive adjustments to the height of its end relative to the center of the precast block. This allows for better adaptation to the modification of the reinforcing mesh. At the same time, the adjustable support arm can slide, allowing the distance between the mounting base and the brick-concrete wall surface to be adjusted. This also allows the position of the reinforcing mesh relative to the base and its position on the sprayed concrete to be adjusted, ensuring it is in the optimal position.

[0017] Furthermore, the cooperation between the positioning sleeve and the locking sleeve secures the adjustable support arm. The horizontal plane formed by the V-shaped double arms ensures the smooth laying of the reinforcing mesh, reducing the deviation rate of the spacing between the mesh and the wall surface and the thickness of the protective layer, directly improving the mechanical performance of the reinforced structure. The structure is simple to operate and easy to adjust, shortening the mesh adjustment time for a single precast block. At the same time, the improved positioning accuracy reduces the rework rate in the later stages, indirectly shortening the construction cycle.

[0018] Therefore, this invention has a novel structure, with prefabricated blocks that can be prefabricated and installed on-site. It also allows for adjustment of the horizontal position and spacing of the reinforcing mesh, facilitating on-site installation, significantly reducing the construction cycle, improving construction efficiency, and enhancing the service life of the overall structure. It provides a practical and efficient technical solution for the reinforcement of concrete slab walls in old brick-concrete structure renovation projects and has high promotional value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 Another perspective illustration; Figure 3 for Figure 1 A top-view structural diagram; Figure 4 for Figure 1 A schematic diagram of the side-view forehead mechanism; Figure 5 A schematic diagram of the mold for making precast blocks; Figure 6 This is a construction state diagram of the present invention; Figure 7 This is a schematic diagram of the installation structure of the side baffle.

[0020] Reference numerals: 1-Main shaft, 101-Assembly shaft, 1011-Limit block, 102-Adjusting shaft, 2-Precast block, 3-Inner positioning nut, 4-Outer locking nut, 5-First support arm, 6-Second support arm, 7-Support block, 8-Support groove, 9-Reinforcing mesh, 10-Mold, 11-Hanging mesh, 12-Side baffle, 13-Screw, 14-Adjusting sleeve, 15-Positioning sleeve, 16-Locking sleeve. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1: This example aims to provide a precast block for reinforcing concrete slab walls in brick-concrete structures by expanding the concrete slab wall section. It belongs to the field of structural reinforcement and renovation technology for old building renovations. It is mainly used to solve problems such as difficulty in controlling the thickness of sprayed concrete during the reinforcement of old apartment buildings with brick-concrete structures, resulting in either too thin or too thick a layer, affecting the reinforcement effect or causing material waste; difficulty in accurately controlling the spacing between the mesh and the brick-concrete wall surface during mesh installation, difficulty in adjusting the orientation of the supporting foundation leading to poor mesh stability, and difficulty in controlling the thickness of the protective layer of the mesh. These problems not only affect the reinforcement quality and construction efficiency but may also cause safety hazards and shorten the service life of the structure. Therefore, this example provides a precast block for reinforcing concrete slab walls in brick-concrete structures by expanding the concrete slab wall section.

[0022] like Figure 1 As shown, a precast block for reinforcing a brick-concrete slab wall with enlarged cross-section includes a main shaft 1, a precast block 2, an adjusting support arm, and locking components. Addressing the problems of uncontrolled concrete spraying thickness, difficulty in controlling the spacing of the mesh and the thickness of the protective layer, and poor stability of the mesh 11 in traditional manual reinforcement construction, the core concept of this embodiment is to achieve precise control of construction parameters through precast components. Using the precast block 2 as a carrier, assembly, fixing, and position adjustment functions are integrated: on the one hand, the assembly shaft with a glue-receiving groove and the anchoring adhesive ensure a stable connection between the precast block 2 and the wall surface; on the other hand, the rotation and sliding adjustment of the adjusting support arm and the locking components enable flexible adaptation of the mesh 11 position. Combined with the area division of the side baffle, the controllability of the concrete spraying thickness and the parameters of the mesh 11 is ultimately achieved, improving the standardization of the reinforcement construction.

[0023] A main shaft 1 is provided through the center of the precast block 2, thereby forming an assembly shaft 101 and an adjustment shaft 102 at the inner and outer ends of the precast block 2, respectively. In this embodiment, the main shaft 1 is the main structure, and a steel mesh 9 is provided on the main shaft 1. The precast block 2 is formed by casting based on the steel mesh 9. The main shaft 1 penetrates the precast block 2 and forms functional main bodies at both ends of the precast block 2, namely the assembly main body and the adjustment main body. The assembly main body is the assembly shaft 101, which is used to assemble the main body onto the brick-concrete structure. In order to improve the assembly effect, a limiting block is provided on the assembly shaft 101. A glue-receiving groove is formed between the limiting blocks 1011. After drilling a hole in the wall, the assembly shaft 101 is placed in it and anchored by rebar adhesive.

[0024] The main adjustment body is used to adjust the position of the hanging net 11, that is, to adjust the height of the hanging net 11 and the spacing relative to the brick-concrete wall surface. In this embodiment, one end of the adjustment support arm is rotated and slidably set on the adjustment shaft 102, and the other end is a free suspension end. The support height is adjusted by swinging. After the adjustment is completed, the locking member is used to lock the sliding and rotation state of the adjustment support arm on the adjustment shaft 102.

[0025] In practical implementation, the adjusting component includes an inner positioning nut 3 and an outer locking nut 4. The adjusting shaft 102 is provided with a threaded section. The inner positioning nut 3 and the outer locking nut 4 are spaced apart on the threaded section. The inner positioning nut 3 and the outer locking nut 4 can be independently adjusted in position on the threaded section, thereby realizing the adjustment of the distance between the two nuts. The adjusting support arm is set between the inner positioning nut 3 and the outer locking nut 4 and is locked by the adjustment of the distance between the nuts.

[0026] A construction method for a precast block 2 for expanding and reinforcing the cross-section of a brick-concrete slab wall, applied to the aforementioned precast block 2 for expanding and reinforcing the cross-section of a brick-concrete slab wall, includes the following steps: Step 1: Making Precast Block 2 The main shaft 1 is placed into the template, with its bottom inserted into the slot. Concrete is then poured into the template. After demolding, the precast block 2 structure is formed. The modular design of the precast block 2 reduces on-site pouring procedures and improves construction efficiency.

[0027] Step 2, fixing precast block 2 According to the construction drawings, the hole positions are marked, and holes are drilled on the brick-concrete wall according to the hole positions. After injecting anchoring adhesive into the holes, the assembly shaft 101 is inserted into the holes. After solidification, the precast block 2 is fixed to the brick-concrete wall. Specifically, in this embodiment, the brick-concrete wall is not flat. Circular holes of a specific depth are drilled on the brick-concrete wall, and then the precast block 2 is fixed tightly against the brick-concrete wall in the circular holes. Since the main shaft 1 is of prefabricated length, the end of the main shaft 1 is on the corresponding horizontal reference plane.

[0028] Step 3, adjust the position of the hanging net 11. Adjust the positions of the inner positioning nut 3 and the outer locking nut 4 to adjust the distance between the mesh 11 and the brick-concrete wall surface. At the same time, adjust the swing amplitude of the adjustment support arm to adjust the support height of the mesh 11. Then tighten the outer locking nut 4 to lock the position of the mesh 11. In this embodiment, by adjusting the cooperation between the support arm and the locking part, the distance between the mesh 11 and the wall surface and the thickness of the protective layer are precisely controlled, avoiding insufficient reinforcement strength or material waste due to parameter deviation.

[0029] Step 4, Netting 11 Hang the steel mesh in the slot of the adjusting support arm; Step 5, spraying concrete Use a mortar spraying machine to spray concrete onto the wall, then smooth it out.

[0030] After the mesh is hung 11, the end of the main shaft 1 is used as a fixed base. The side baffle 12 is fixed to the end of the main shaft 1 or the locking nut, thus forming multiple spraying areas. Concrete is sprayed onto the wall using a mortar spraying machine. After smoothing, the side baffle 12 is removed. Finally, the gaps are repaired. The side baffle 12 divides the spraying area, effectively controlling the thickness of the concrete spraying and ensuring a uniform and stable reinforcement effect.

[0031] Regarding the above-mentioned construction structure, in this embodiment, the end of the main shaft 1 is used as the fixed base. For example, the side baffle 12 has a U-shaped structure, and the rear side of the side baffle 12 rests against the main shaft 1. It can be fixed by screws 13 or by clipping, thereby fixing the side baffle 12 on the water surface reference surface. Based on the side baffle 12, marking scale lines are arranged on the side baffle 12 along its thickness direction to provide a reference for smoothing the wall surface.

[0032] In this embodiment, the precast block 2 for expanding and reinforcing the cross-section of a brick-concrete slab wall uses a main shaft 1 as its core structure. The precast block 2 integrates the assembly shaft 101 and the adjustment shaft 102 into a single unit. The assembly shaft 101 is anchored to a drilled hole in the brick-concrete wall surface using rebar adhesive, ensuring stable installation of the precast block 2. The threaded section on the adjustment shaft 102, in conjunction with the inner positioning nut 3 and the outer locking nut 4, locks the position of the rotatable and sliding adjustment support arm, thereby precisely adjusting the height of the mesh 11, its distance from the wall surface, and the thickness of the protective layer. Simultaneously, the side baffle 12 divides the spraying area, and thickness markings are set on the side baffle 12 to further assist in controlling the concrete spraying thickness, thus controlling the protective layer thickness, preventing the mesh 11 from rusting, improving structural durability, reducing shrinkage cracks, and extending the overall service life of the structure. This provides a practical and efficient technical solution for reinforcing concrete slab walls in brick-concrete structure renovation projects and has high promotional value.

[0033] Example 2 further illustrates the specific structure and installation structure of the adjustable support arm.

[0034] In a further implementation, an adjusting sleeve 14 is fixed on the inner positioning nut 3. The adjusting sleeve 14 is fitted onto the adjusting shaft 102, and the adjusting support arm is fitted onto the adjusting sleeve 14. In this embodiment, the adjusting sleeve 14 serves as the basis for the swing of the adjusting support arm, ensuring the swing stability of the adjusting support arm. Specifically, nuts are provided at both ends of the adjusting sleeve 14, allowing the adjusting sleeve 14 to be adjusted in position and providing a basis for the rotation of the adjusting support arm. To limit the movement of the adjusting support arm, positioning sleeves 15 are provided on both sides of the adjusting sleeve 14. The adjusting support arm is fitted between the two positioning sleeves 15, and a locking sleeve is provided on the outer locking nut 4. The positioning sleeves 15 can be fitted into the locking sleeves 16, thereby pressing the adjusting support arm with the locking sleeves 16.

[0035] By fixing the adjusting sleeve 14 to the inner positioning nut 3, and with the adjusting sleeve 14 fitted onto the adjusting shaft 102, a stable swing base is provided for the adjusting support arm. The nuts at both ends of the adjusting sleeve 14 allow for position adjustment and simultaneously create conditions for the rotation of the adjusting support arm. The positioning sleeves 15 on both sides of the adjusting sleeve 14 limit the adjustment support arm, ensuring it fits between the two positioning sleeves 15. The locking sleeve on the outer locking nut 4 can fit onto the positioning sleeves 15, thereby pressing the adjusting support arm and achieving a stable lock.

[0036] In specific implementation, the adjusting support arm includes a first support arm 5 and a second support arm 6, which are arranged in a V-shape, and corresponding grooves 8 are provided at the ends of the first support arm 5 and the second support arm 6. Specifically, the first support arm 5 and the second support arm 6 are staggered, and support blocks 7 are provided at their ends, with grooves 8 formed on the two support blocks 7.

[0037] This embodiment uses a double-arm support, which provides good structural stability. When passing through, the double arms provide a horizontal plane at a support point to further locate the position of the steel mesh, ensuring its structural stability and accurate positioning.

[0038] To address the issues of insufficient swing stability and poor positioning accuracy of the adjustable support arm, the core concept of this further implementation structure is to optimize the support and positioning structure of the adjustable support arm. By adding an adjusting sleeve 14, the stability of the adjustable support arm's swing is strengthened; the cooperation of the positioning sleeve 15 and the locking sleeve improves the limiting and locking effect of the adjustable support arm, ensuring its fixed position. Simultaneously, the adjustable support arm is designed as a V-shaped double-arm structure, using the double arms to create a horizontal plane, further improving the stability and accuracy of the rebar mesh positioning, thereby more precisely controlling the relevant parameters of the mesh 11 and optimizing the reinforcement construction effect.

[0039] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. The basic concept of the present invention lies in adjusting the support arm by rotating and swinging to allow for small-amplitude adaptive adjustments to the height of its end relative to the center of the precast block. This better adapts to the modification of the reinforcing mesh. Simultaneously, the adjustable support arm can slide, allowing for adjustment of the distance between the mounting foundation and the brick-concrete wall surface. Furthermore, the use of a V-shaped double-arm support utilizes the stability of the geometric structure to improve the planar accuracy of the reinforcing mesh positioning, ultimately achieving precise control of key parameters such as mesh spacing and protective layer thickness, ensuring the quality of reinforcement construction. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A precast block for reinforcing and expanding the cross-section of a brick-concrete structure concrete slab wall, characterized in that: It includes a main shaft, a precast block, an adjusting support arm, and a locking component; the main shaft is provided through the center of the precast block, thereby forming an assembly shaft and an adjusting shaft at the inner and outer ends of the precast block, respectively; wherein the assembly shaft is used to assemble the main body onto the brick-concrete structure; one end of the adjusting support arm is rotatably and slidably mounted on the adjusting shaft, and the locking component is used to lock the sliding and rotating states of the adjusting support arm on the adjusting shaft.

2. The precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall as described in claim 1, characterized in that: The adjusting component includes an inner positioning nut and an outer locking nut. The adjusting shaft is provided with a threaded section. The inner positioning nut and the outer locking nut are spaced apart on the threaded section. The adjusting support arm is disposed between the inner positioning nut and the outer locking nut and is locked by adjusting the spacing between the nuts.

3. The precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall as described in claim 2, characterized in that: An adjusting sleeve is fixed on the inner positioning nut, the adjusting sleeve is fitted onto the adjusting shaft, and the adjusting support arm is fitted onto the adjusting sleeve.

4. The precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall as described in claim 3, characterized in that: The adjusting sleeve is provided with positioning sleeves on both sides, and the adjusting support arm is fitted between the two positioning sleeves. The outer locking nut is provided with a locking sleeve, and the positioning sleeve can be fitted into the locking sleeve, so that the locking sleeve presses the adjusting support arm.

5. The precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall according to any one of claims 1-4, characterized in that: The adjustable support arm includes a first support arm and a second support arm, which are arranged in a V-shape, and corresponding grooves are provided at the ends of the first support arm and the second support arm.

6. The precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall according to claim 5, characterized in that: A steel mesh is provided on the main shaft, and the precast blocks are formed by casting based on the steel mesh.

7. The precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall according to claim 5, characterized in that: The first support arm and the second support arm are offset and have support blocks at their ends, with slots formed on the two support blocks.

8. The precast block for expanding and reinforcing the cross-section of a brick-concrete structure concrete slab wall according to claim 1, characterized in that: The assembly shaft is provided with limit blocks, and adhesive grooves are formed between the limit blocks.

9. A construction method for precast blocks for expanding and reinforcing the cross-section of brick-concrete slab walls, applied to the precast blocks for expanding and reinforcing the cross-section of brick-concrete slab walls as described in claim 1, characterized in that... Includes the following steps: Step 1: Precast Block Production The main shaft is placed into the template so that the bottom of the main shaft is inserted into the slot, and then concrete is poured into the template; after demolding, a precast block structure is formed. Step 2, fixing the precast blocks According to the construction drawings, mark the hole positions, drill holes in the brick-concrete wall according to the hole positions, inject anchoring adhesive into the holes, insert the assembly shaft into the holes, and after solidification, fix the precast blocks to the brick-concrete wall. Step 3, adjust the position of the hanging net. Adjust the positions of the inner positioning nut and the outer locking nut to adjust the distance between the mesh and the brick-concrete wall surface. At the same time, adjust the swing amplitude of the adjustment support arm to adjust the support height of the mesh. Then tighten the outer locking nut to lock the net in place; Step 4, Hanging the net Hang the steel mesh in the slot of the adjusting support arm; Step 5, spraying concrete Use a mortar spraying machine to spray concrete onto the wall, then smooth it out.

10. The construction method for precast blocks for expanding and reinforcing the cross-section of brick-concrete slab walls according to claim 9, characterized in that: The process also includes the following steps: After the mesh is installed, the end of the main shaft serves as a fixed base. The side baffles are fixed to the end of the main shaft or the locking nut to form multiple spraying areas. Concrete is sprayed onto the wall using a mortar spraying machine. After smoothing, the side baffles are removed, and finally, the gaps are repaired.

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