A fabricated reinforcement device for existing masonry walls

Abstract

The application discloses a kind of existing masonry wall assembly type reinforcing device, it is characterized by: including the high-performance fiber reinforced cement-based prefabricated plate (100) of surface with screw (10), the cannon nail (20) of existing masonry wall (200) surface, and the self-compacting grouting layer (300) filled between high-performance fiber reinforced cement-based prefabricated plate (100) and existing masonry wall (200);The outer surface (A) of the high-performance fiber reinforced cement-based prefabricated plate (100) is flat, the screw (10) with arrayed arrangement is arranged in inner surface (B), and the nail tip (1) of screw (10) is embedded in high-performance fiber reinforced cement-based prefabricated plate (100), and nail cap end (2) is extended in inner surface (B);The screw (10) and cannon nail (20) form dislocation lap joint in self-compacting grouting layer (300), and lap joint length (E) is 10~20mm.Compared with prior art, the existing masonry wall assembly type reinforcing device of the application has good compression resistance and seismic performance, little wet operation amount in field, little influence on normal use of building, good flatness of reinforcing layer surface and other characteristics, and the wall surface after reinforcement can meet the requirements of plaster-free.The application has good application prospect in existing masonry structure reinforcement.

Description

Technical Field

[0001] This invention relates to the field of building structure reinforcement technology, specifically a reinforcement device for improving the load-bearing capacity and seismic performance of existing masonry walls. Background Technology

[0002] Masonry structures account for a very high proportion of existing buildings in my country, widely distributed in old urban residential buildings, schools, hospitals, and rural dwellings. These structures suffer from low tensile and shear strength of materials, poor overall integrity, and are generally plagued by inadequate structural measures, low mortar strength, and excessive wall height-to-thickness ratios due to limitations imposed by economic conditions and technical standards in earlier years. After decades of service, the mechanical properties of the materials deteriorate, foundation settlement occurs, and improper renovations such as openings and demolitions further weaken the load-bearing capacity of the walls.

[0003] From a safety perspective, masonry walls are prone to brittle failure and even complete collapse under earthquake loads. Past earthquake damage surveys have shown that the collapse of load-bearing masonry walls is a major cause of casualties. With the repeated improvements to my country's seismic design standards (such as the "Standard for Seismic Appraisal of Buildings" GB 50023-2009 and subsequent revisions), the seismic resistance of a large number of existing masonry buildings remains significantly insufficient.

[0004] The "Opinions on Continuously Promoting Urban Renewal Action" issued in 2025 explicitly requires "classifying and batching urban buildings with seismic safety hazards and value for reinforcement" to undergo seismic reinforcement, signifying that old masonry structures are no longer simply subject to large-scale demolition and reconstruction. Therefore, reinforcing existing masonry walls is of great significance for eliminating safety hazards and improving the safety of existing masonry buildings.

[0005] Reinforcement methods for existing masonry walls can be divided into two categories: direct reinforcement and indirect reinforcement. Direct reinforcement, also known as increasing the cross-section, most commonly involves a reinforced mesh and cement mortar surface layer. This method reinforces the existing wall by laying a reinforcing mesh on one or both sides and applying cement mortar. Its advantages are simple technology and low cost, but its disadvantages include a large amount of wet work, a long construction period, significant impact on the normal use of the building, and the need for a second mortar finish before wall decoration, further extending the construction period. External steel reinforcement is an indirect reinforcement method. This method offers reliable stress distribution and relatively less wet work, but it is expensive and requires anti-corrosion and fireproofing treatment. The second finishing layer application on the reinforced wall is also troublesome. Therefore, existing masonry wall reinforcement technologies have performance shortcomings, and new reinforcement methods are urgently needed. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a prefabricated existing masonry wall reinforcement device with good reinforcement effect, high construction efficiency, and no need for leveling the reinforced wall surface. The technical solution is as follows: A prefabricated reinforcement device for existing masonry walls, characterized in that: it includes a high-performance fiber-reinforced cement-based precast slab (100) with screws (10) on its surface, nails (20) on the surface of the existing masonry wall (200), and a self-compacting grouting layer (300) filled between the high-performance fiber-reinforced cement-based precast slab (100) and the existing masonry wall (200); the outer surface (A) of the high-performance fiber-reinforced cement-based precast slab (100) is flat, and the inner surface (B) has an array of screws (10), and the nail tip (1) of the screw (10) is embedded in the high-performance fiber-reinforced cement-based precast slab (100), and the nail head end (2) protrudes outward. On the inner surface (B); the high-performance fiber-reinforced cement-based precast slab (100) has multiple internal threaded sleeves (3) pre-embedded around its perimeter. By screwing in adjusting bolts (4) into the internal threaded sleeves (3), the flatness of the high-performance fiber-reinforced cement-based precast slab (100) and the gap width between it and the existing masonry wall (200) are adjusted; the side (C) of the high-performance fiber-reinforced cement-based precast slab (100) has tongue and groove joints (5). Multiple high-performance fiber-reinforced cement-based precast slabs (100) are spliced ​​together along the length of the existing masonry wall (200) to form a reinforcement layer of the wall; the nail tip of the nail (20) is driven into the existing masonry wall (200), and the nail head extends out of the wall surface; the screw (10) and the nail (20) form a staggered overlap in the self-compacting grouting layer (300), and the overlap length (E) is 10~20mm. The high-performance fiber-reinforced cement-based precast slab (100) is characterized in that its length is close to the net height of the existing wall (200), and a grouting port (6) is reserved at the top edge (D). The screw (10) is a commercial galvanized screw with a diameter of 4-8 mm and a length of 15-30 mm. The anchorage length of the screw tip (1) in the high-performance fiber-reinforced cement-based precast slab (100) is 10-15 mm, and the extension length of the screw head end (2) is 10-20 mm. The high-performance fiber-reinforced cement-based precast slab (100) is made of ultra-high performance concrete, high-ductility concrete, and fiber-reinforced cement-based materials, with a thickness of 15-25 mm. The nail tip (20) is driven into the existing masonry wall (200) to a depth of 20-40 mm, and the extension length of the nail head is 20-30 mm. The self-compacting grouting layer (300) has a thickness of 30-50 mm.

[0007] Compared with existing technologies, the beneficial effects of this invention are as follows: First, the reinforcement effect is excellent. The screw group on the surface of the high-performance fiber-reinforced cement-based precast slab serves as an interface reinforcement measure, ensuring that the precast slab and the self-compacting grout layer are firmly bonded together. This enhances both the shear strength along the tangential direction of the bonding surface and the anchoring pull-out force along the normal direction of the bonding surface. The nails fixed to the surface of the existing masonry wall ensure the bonding force between the self-compacting grout layer and the existing masonry wall along the tangential and normal directions of the bonding surface. The screws and nails form a staggered overlap in the self-compacting grout layer, ensuring the force transmission effect between the existing masonry wall and the high-performance fiber-reinforced cement-based precast slab. The wall and the reinforcement layer can work together to bear the load under both vertical and horizontal loads. The high strength and high ductility of the high-performance fiber-reinforced cement-based precast slab can be effectively utilized, and the compressive and seismic performance (especially ductility and energy dissipation capacity) of the reinforced masonry wall are significantly improved. Secondly, the use of precast slabs for construction minimizes on-site wet work, shortens the construction period, and reduces the impact on the normal use of the building. Furthermore, the flatness between the high-performance fiber-reinforced cement-based precast slabs can be adjusted using adjusting bolts, which is simple and efficient. The good flatness of the reinforced layer surface allows the reinforced wall to meet the requirement of not requiring plastering, further reducing construction steps and shortening the construction period. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the appearance of a high-performance fiber-reinforced cement-based precast slab.

[0009] Figure 2 This is a schematic diagram of the existing wall's exterior.

[0010] Figure 3 This is a schematic diagram of a prefabricated reinforcement device for masonry walls.

[0011] Figure 4 This is a construction diagram of a prefabricated reinforcement device for masonry walls.

[0012] In the figure: (1) nail tip; (2) nail head end; (3) internal thread sleeve; (4) adjusting bolt; (5) tongue and groove; (6) grouting port; (10) screw; (20) burr nail; (100) high-performance fiber reinforced cement-based precast slab; (200) existing masonry wall; (300) self-compacting grouting layer; (400) temporary support; (A) outer surface of high-performance fiber reinforced cement-based precast slab; (B) inner surface of high-performance fiber reinforced cement-based precast slab; (C) side of high-performance fiber reinforced cement-based precast slab; (D) top edge of high-performance fiber reinforced cement-based precast slab; (E) overlap length. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0014] Example:

[0015] Step 1: Install steel template, fix inner threaded sleeve (3), and pour high-performance fiber reinforced cement-based material; after vibration to level and compact, pre-embed arrayed screws (10) on the surface of high-performance fiber reinforced cement-based material, with the screw tip (1) inserted into the high-performance fiber reinforced cement-based material and the screw head end (2) protruding outward. After the high-performance fiber reinforced cement-based material has cured, remove the mold to complete the production of high-performance fiber reinforced cement-based precast slab (100);

[0016] Step 2: Remove the plaster layer on the surface of the existing masonry wall (200), mark the nailing position on the wall surface, and then use a nail gun to drive the nails (20) into the wall one by one, with the nail head protruding out of the wall surface.

[0017] Step 3: Assemble the high-performance fiber-reinforced cement-based precast panels (100) one by one along the length of the existing masonry wall (200), and set up temporary supports (400).

[0018] Step 4: Screw in the adjusting bolt (4) into the inner threaded sleeve (3) and adjust the flatness of the high-performance fiber reinforced cement-based precast slab (100) piece by piece;

[0019] Step 5: Fill the cavity between the high-performance fiber-reinforced cement-based precast slab (100) and the existing masonry wall (200) by injecting self-compacting grout through the grouting port (6) at the top of the high-performance fiber-reinforced cement-based precast slab (100).

[0020] Step 6: After the self-compacting grout layer (300) reaches the preset strength, remove the temporary support (400) to complete the reinforcement construction of the existing masonry wall.

[0021] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention, such as using other types of nails, custom double-ended nails, other types of screws to replace screws and nail gun nails, or using other types of cement materials or resin materials to replace self-compacting grout to fill the cavity between the precast slab and the existing wall, can all be simple technical substitutions based on the prompts of the present invention, and therefore all fall within the scope of protection claimed by the present invention.

Claims

1. A prefabricated reinforcement device for existing masonry walls, characterized in that: The system includes a high-performance fiber-reinforced cement-based precast slab (100) with screws (10) on its surface, nails (20) on the surface of an existing masonry wall (200), and a self-compacting grouting layer (300) filling the space between the high-performance fiber-reinforced cement-based precast slab (100) and the existing masonry wall (200); the outer surface (A) of the high-performance fiber-reinforced cement-based precast slab (100) is flat, and the inner surface (B) has an array of screws (10), with the screw tip (1) embedded in the high-performance fiber-reinforced cement-based precast slab (100) and the screw head (2) extending outward from the inner surface (B); the high-performance fiber-reinforced cement-based precast slab (100) has multiple internally threaded sleeves (3) embedded along its periphery. The flatness of the high-performance fiber-reinforced cement-based precast slab (100) and the gap width between it and the existing masonry wall (200) are adjusted by screwing an adjusting bolt (4) into the inner thread sleeve (3); the side (C) of the high-performance fiber-reinforced cement-based precast slab (100) has a tongue and groove (5); multiple high-performance fiber-reinforced cement-based precast slabs (100) are spliced ​​together along the length of the existing masonry wall (200) to form a reinforcement layer of the wall; the nail tip of the nail (20) is driven into the existing masonry wall (200), and the nail head extends out of the wall surface; the screw (10) and the nail (20) form a staggered overlap in the self-compacting grouting layer (300), and the overlap length (E) is 10~20mm.

2. The prefabricated reinforcement device for existing masonry walls according to claim 1, characterized in that: The length of the high-performance fiber-reinforced cement-based precast slab (100) is close to the net height of the existing wall (200), and a grouting port (6) is reserved at the top edge (D).

3. The prefabricated reinforcement device for existing masonry walls according to claim 1, characterized in that: The screw (10) is a commercial galvanized screw with a diameter of 4~8mm and a length of 15~30mm. The anchorage length of the screw tip (1) in the high-performance fiber-reinforced cement-based precast slab (100) is 10~15mm, and the overhang length of the screw head end (2) is 10~20mm.

4. The prefabricated reinforcement device for existing masonry walls according to claim 1, characterized in that: The materials of the high-performance fiber-reinforced cement-based precast slab (100) include ultra-high performance concrete, high ductility concrete and fiber-reinforced cement-based materials, with a thickness of 15~25mm.

5. The prefabricated reinforcement device for existing masonry walls according to claim 1, characterized in that: The nail tip of the nail (20) is driven into the existing masonry wall (200) to a depth of 20~40mm, and the nail head extends outward for 20~30mm.

6. The prefabricated reinforcement device for existing masonry walls according to claim 1, characterized in that: The thickness of the self-compacting grout layer (300) is 30~50mm.

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