Construction method for improving stability of concrete solid brick masonry wall

Abstract

The invention discloses a construction method for improving the stability of a concrete solid brick masonry wall. The construction method comprises the following core steps that the specifications of materials such as concrete solid bricks and hot-rolled ribbed steel bars are checked; vertical tie bars are implanted along the height of the frame columns according to the interval of 500 mm, brick bodies are built through a three-in-one-out method, and the tie bars are pressed into the brick bodies; the full-length ribs are arranged according to the interval of 500 mm and are bound with the vertical tie bars to form a vertical framework; horizontal tie bars are bound in a plum blossom shape of 500 mm along the through long bars, circular masonry is conducted, and cement mortar joints with the thickness being 8-10 mm are controlled; after the wall body is built, the two-way reinforcing meshes are laid on the two sides and fixed to the horizontal tie bars in a spot welding mode, and an overall stress system is formed. Through the synergistic effect of the multi-dimensional steel bar structure, the tensile strength, shear resistance and ductile deformation capacity of the wall are remarkably improved, out-of-plane bulging deformation is restrained, brittle failure is converted into ductile failure, construction is easy and convenient, materials are easy to obtain, and the method is suitable for various concrete solid brick masonry wall projects.

Description

Technical Field

[0001] This invention relates to the field of masonry construction technology, and more specifically, to a construction method for improving the stability of solid concrete brick masonry walls. Background Technology

[0002] In building construction, autoclaved aerated concrete blocks and solid concrete brick masonry walls are widely used. Current technology typically involves post-installing reinforcing bars on the frame columns (with 2C6 steel bars embedded every 500mm along the wall height, ≥1000mm into the wall), and when the floor height exceeds 4m, installing ring beams, structural columns, and reinforcing bars. These tie bars, ring beams, and structural columns firmly connect the masonry wall to the frame columns and beams, forming a unified load-bearing system to prevent the wall from separating from the main structure due to its own weight or external loads.

[0003] However, the aforementioned conventional construction methods have significant drawbacks: First, masonry walls rely solely on vertical tie bars, ring beams, and structural columns for connection to the main structure, lacking bidirectional steel mesh and effective horizontal tie structures. This results in weak tensile and shear strength within the wall plane, making it unable to absorb energy through horizontal deformation and highly susceptible to overall collapse under the impact of an explosive shock wave. Second, the walls lack ductile deformation capacity, exhibiting typical brittle failure under the impact of an explosive wave, instantly disintegrating into fragments that fly outwards, easily causing secondary damage. Third, when the wall is subjected to initial micro-cracks due to vertical pressure, local impact, or other loads, these cracks will rapidly penetrate without effective restraint, forming horizontal, vertical, or diagonal through-cracks, ultimately causing the wall to decompose from an "integrated structure" into independent brick / block units, losing its load-bearing capacity. Fourth, existing masonry walls are unable to cope with deformation caused by temperature changes, failing to maintain structural stability in high-temperature environments. Furthermore, during long-term use, factors such as temperature cycling and uneven foundation settlement will cause micro-cracks to continue to expand, ultimately leading to structural failure of the wall. Summary of the Invention

[0004] The purpose of this invention is to address the problems mentioned in the background section by providing a construction method for improving the stability of solid concrete masonry walls. This method constructs an overall load-bearing grid consisting of vertical tie bars, continuous reinforcement bars, horizontal tie bars, and bidirectional steel mesh, thereby enhancing the wall's in-plane tensile, shear, and ductile deformation capabilities. This effectively constrains the out-of-plane bulging deformation of the wall under the action of an blast wave, transforming the brittle failure of the masonry wall into ductile failure, thus buying valuable time for personnel evacuation. Simultaneously, it solves the safety hazards of walls being prone to cracking, collapse, and failure.

[0005] The present invention adopts the following technical solution:

[0006] A construction method for improving the stability of solid concrete brick masonry walls includes the following steps:

[0007] S1. Material Specification Verification: Confirm that the quality and specifications of the hot-rolled ribbed steel bars, solid concrete bricks and cement mortar used in construction meet the design requirements.

[0008] S2. Vertical tie bar installation and foundation construction: Vertical tie bars are installed at 500mm intervals along the height of the frame column using the post-installation rebar process. The vertical tie bars are pressed into the solid concrete bricks, and the solid concrete bricks are constructed using the three-header-one-stretcher method.

[0009] S3. Connection of continuous reinforcing bars and vertical tie bars: Continuous reinforcing bars are arranged at 500mm intervals along the height of the wall, and the continuous reinforcing bars are tied to the vertical tie bars to form a vertical load-bearing skeleton;

[0010] S4. Horizontal tie bar connection and cyclic masonry: Tie the horizontal tie bar to the continuous bar at the preset interval along the length of the continuous bar. After the connection is completed, continue to lay solid concrete bricks, control the thickness of the cement mortar filling joint, and repeat this step until the wall design height is completed.

[0011] S5. Fixing of bidirectional steel mesh: After the wall is built, bidirectional steel mesh is laid on both sides of the wall and fixed to the horizontal tie bars to form an overall load-bearing system.

[0012] Furthermore, the solid concrete brick has dimensions of 240mm×115mm×53mm, the vertical tie bars are 2A6@500mm hot-rolled ribbed steel bars, the continuous bars are 3A8@500mm hot-rolled ribbed steel bars, the horizontal tie bars are 1A6 specification hot-rolled ribbed steel bars, and the bidirectional steel mesh is made of A6@200mm bidirectional steel bars.

[0013] Furthermore, the length of a single vertical tie bar is 100mm, and it is implanted into the frame column using a post-installation method.

[0014] Furthermore, the distance between the binding connection points of the continuous reinforcing bar and the vertical tie bar is no more than 200mm to ensure the stability of the connection node.

[0015] Furthermore, the horizontal tie bars are arranged in a staggered pattern at 500mm intervals, with a single bar length of 250mm, and are fixed to the continuous bars by binding.

[0016] Furthermore, the bidirectional steel mesh is fixed to the horizontal tie bar by spot welding, with a spot welding spacing of no more than 300mm.

[0017] Furthermore, the thickness of the mortar joint is controlled at 8mm-10mm, and the mortar is spread by scraping during the masonry process to ensure that the mortar joint is full and without continuous gaps.

[0018] Furthermore, in step S4, the connection spacing between the horizontal tie bar and the longitudinal bar is 500mm, forming a horizontal force network with the longitudinal bar and the vertical tie bar.

[0019] Beneficial effects

[0020] The stress system is improved and the stability is greatly enhanced: Through the organic combination of vertical tie bars, continuous bars, horizontal tie bars and two-way steel mesh, a three-dimensional stress grid is formed, which firmly binds the wall and frame columns into a whole, significantly enhancing the wall's in-plane tensile and shear strength and ductile deformation capacity, and effectively preventing crack penetration and wall collapse.

[0021] Optimized failure modes and upgraded safety: It can effectively constrain the out-of-plane bulging deformation of the wall under the action of external forces such as blast waves and earthquakes, transforming the brittle failure of traditional masonry walls into ductile failure, avoiding secondary damage caused by the instantaneous collapse of the wall and the flying debris, thus buying valuable time for personnel evacuation and significantly improving the building safety level.

[0022] The construction process is simple and the implementation cost is controllable: the construction process is clear, no special equipment is required, the materials used such as concrete solid bricks and steel bars are widely available and easy to obtain, and the construction steps are highly compatible with conventional masonry processes, resulting in high work efficiency and no significant increase in construction costs, making it easy to promote and apply on a large scale.

[0023] Extended service life and wide range of applications: It effectively solves the problem of wall crack expansion caused by factors such as temperature cycling and uneven foundation settlement, and improves the structural stability and durability of the wall in complex environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the construction of solid concrete bricks according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the construction of solid concrete bricks according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of a bidirectional steel mesh according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a horizontal tie bar according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of a vertical tie bar according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of a continuous reinforcing bar according to an embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] This invention discloses a construction method for improving the stability of solid concrete brick masonry walls, comprising the following steps:

[0032] S1. Material Specification Verification: Confirm that the quality and specifications of the hot-rolled ribbed steel bars, solid concrete bricks, and cement mortar used in the construction meet the design requirements. This step avoids potential quality problems from the source, ensures that the material parameters match the construction drawings and building codes, provides a qualified foundation for subsequent processes such as steel bar binding, masonry, and mesh fixing, avoids rework due to incompatibility between materials and processes, and improves construction efficiency.

[0033] S2. Setting of vertical tie bars 2 and foundation masonry: Vertical tie bars 2 are set at 500mm intervals along the height direction of the frame column using the post-installation rebar process. The vertical tie bars 2 are pressed into the concrete solid bricks, and the concrete solid bricks 1 are laid using the three-header-one-stretcher method. This step strengthens the integrity of the wall and the main structure, optimizes the compressive strength of the masonry structure, and reserves a stable node for subsequent binding and connection with the continuous reinforcement. It ensures that the vertical tension can be effectively transferred to the continuous reinforcement through the tie bars, forming a vertical force-bearing skeleton and laying the foundation for the overall force-bearing system.

[0034] S3. Connection of continuous reinforcing bars 6 and vertical tie bars 2: Continuous reinforcing bars 6 are arranged at 500mm intervals along the height of the wall. The continuous reinforcing bars 6 are tied to the vertical tie bars 2 to form a vertical load-bearing skeleton. This step solves the problem of "dispersed vertical force and concentrated local force" in traditional masonry walls. The continuous reinforcing bars can evenly distribute the vertical load and tension of each layer of the wall, and avoid cracking of local bricks due to excessive force.

[0035] S4. Horizontal tie bar connection and cyclic masonry: Tie the horizontal tie bars to the continuous bars at preset intervals along the length of the continuous bars. After the connection is completed, continue to lay solid concrete bricks, control the thickness of the cement mortar filling joints, and repeat this step until the wall design height is completed. This step forms a horizontal stress network, enhances tensile and shear resistance, and the control of mortar joints ensures the sealing and integrity of the wall.

[0036] S5. Fixing of bidirectional steel mesh 3: After the wall is built, bidirectional steel mesh 3 is laid on both sides of the wall and fixed to the horizontal tie bar 4 to form an overall load-bearing system.

[0037] Example

[0038] In an industrial building project, the construction method of this invention was used for the construction of solid concrete brick masonry walls. The wall height was 6m, the wall thickness was 240mm, and the frame column spacing was 4m. The specific construction process is as follows:

[0039] 1. Construction Preparation

[0040] On-site material inspection: The solid concrete bricks are 240mm×115mm×53mm in size, which meets the design requirements; the hot-rolled ribbed steel bars include 2A6 and 3A8 specifications, and the steel bars are free from rust and bending deformation, and their performance indicators meet the standards; the cement mortar strength grade is M10, which meets the mortar joint filling strength requirements.

[0041] 2. Vertical tie bar installation and foundation masonry

[0042] Along the height of the frame columns, 2A6×100mm vertical tie bars are inserted at 500mm intervals using the post-installation rebar technique, and the rebar depth meets the specifications. The concrete solid bricks are laid using the "three stretchers and one header" method, ensuring that the vertical tie bars are accurately pressed into the brick body during the construction process, and that the brick body is laid flat with staggered joints and overlapping inside and outside.

[0043] 3. Tie the continuous reinforcing bars to the vertical tie bars.

[0044] Arrange 3A8 continuous reinforcing bars along the wall height at 500mm intervals. Use tie wire to firmly bind the continuous reinforcing bars to the vertical tie bars. The spacing between the binding points should not exceed 200mm to ensure that the connection nodes are stable and free from loosening.

[0045] 4. Horizontal tie bar connection and cyclic masonry

[0046] Along the length of the continuous reinforcing bar, arrange A6×250mm horizontal tie bars in a staggered pattern at 500mm intervals. After binding the horizontal tie bars to the continuous reinforcing bar, continue laying solid concrete bricks. During construction, use a mortar mixer to mix cement mortar, controlling the mortar joint thickness to approximately 9mm. Apply the mortar using a scraper method to ensure full mortar joints without continuous gaps. Repeat this process until the 6m high wall is completed.

[0047] 5. Fixing of bidirectional steel mesh

[0048] After the wall is built, A6@200mm bidirectional steel mesh is laid on both sides of the wall. The steel mesh is tightly attached to the wall surface and fixed to the horizontal tie bars by spot welding. The spot welding interval is no more than 300mm to ensure that the steel mesh is not loose or warped, and finally forms an integral load-bearing system.

[0049] Implementation effect

[0050] After the wall was constructed, tests showed that the in-plane tensile and shear strength of the wall was improved compared to conventional construction methods, and the ductility was significantly enhanced. Under the action of a simulated blast shock wave, the wall did not collapse as a whole, but only showed local micro-cracks, and the cracks were not continuous. This verifies that the method of the present invention can effectively improve the stability and safety performance of the wall and achieve the expected technical effect.

[0051] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A construction method for improving the stability of a concrete solid brick masonry wall, characterized by: The method comprises the following steps: S1, material specification verification: confirming that the quality and specification of hot-rolled ribbed steel bars, concrete solid bricks and cement mortar used for construction meet the design requirements; S2, vertical tie bar setting and foundation masonry: setting vertical tie bars by using the post-anchoring technology at an interval of 500 mm along the height direction of the frame column, pressing the vertical tie bars into the concrete solid bricks, and masonry of the concrete solid bricks by using the three-order one-dot method; S3, connection of through bars and vertical tie bars: arranging the through bars at an interval of 500 mm along the height direction of the wall body, and binding and connecting the through bars and the vertical tie bars to form a vertical force-bearing framework; S4, connection of horizontal tie bars and circular masonry: binding and connecting the horizontal tie bars and the through bars at a preset interval along the length direction of the through bars, continuing to masonry the concrete solid bricks after the connection is completed, controlling the mortar joint thickness filled with the cement mortar, and repeating the step until the design height of the wall body is completed; S5, fixing of bidirectional steel mesh: after the masonry of the wall body is completed, laying the bidirectional steel mesh on both sides of the wall body, fixing the bidirectional steel mesh and the horizontal tie bars to form an overall force-bearing system.

2. The construction method for improving the stability of a concrete solid brick masonry wall according to claim 1, characterized in that: The size of the concrete solid brick is 240 mm*115 mm*53 mm, the vertical tie bar is a hot-rolled ribbed steel bar of 2A6@500 mm, the through bar is a hot-rolled ribbed steel bar of 3A8@500 mm, the horizontal tie bar is a hot-rolled ribbed steel bar of 1A6 specification, and the bidirectional steel mesh is made of a bidirectional steel bar of A6@200 mm.

3. The construction method for improving the stability of a concrete solid brick masonry wall according to claim 1, characterized in that: The single length of the vertical tie bar is 100 mm, and the post-anchoring method is used to implant the vertical tie bar into the frame column.

4. The construction method for improving the stability of a concrete solid brick masonry wall according to claim 1, characterized in that: The binding and connecting point interval of the through bar and the vertical tie bar is not greater than 200 mm, so as to ensure the stability of the connecting node.

5. The construction method for improving the stability of a concrete solid brick masonry wall according to claim 1, characterized in that: The horizontal tie bar is arranged in a plum blossom shape at an interval of 500 mm, and the single length is 250 mm, and the through bar is fixed by binding.

6. The construction method for improving the stability of a concrete solid brick masonry wall according to claim 1, characterized in that: The bidirectional steel mesh and the horizontal tie bar are fixed by spot welding, and the spot welding interval is not greater than 300 mm.

7. The construction method for improving the stability of a concrete solid brick masonry wall according to claim 1, characterized in that: The mortar joint thickness is controlled to be 8 mm-10 mm, the grouting method is used to spread the grout during the masonry process, so as to ensure that the mortar joint is full and has no through joint.

8. The construction method for improving the stability of a concrete solid brick masonry wall according to claim 1, characterized in that: In step S4, the connecting interval of the horizontal tie bar and the through bar is 500 mm, and the through bar and the vertical tie bar form a horizontal force-bearing network.

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