Brickwork structure lintel reinforced through angle steel brackets and steel braces and construction method of brickwork structure lintel reinforced through angle steel brackets and steel braces

Abstract

The invention relates to a masonry structure lintel reinforced through angle steel supports and steel braces and a construction method of the masonry structure lintel. The masonry structure lintel comprises the angle steel supports, batten plates, the steel braces and through-wall bolts. The angle steel support is arranged on the lower portion of a masonry structure lintel crack, and the batten plate is tightly attached to the angle steel support and welded to the angle steel support. One end of the steel brace is welded with the angle steel bracket, and the other end of the steel brace is fastened and connected with the steel brace on the other side of the lintel through a wall-penetrating bolt and a nut; and after the angle steel brackets, the batten plates, the steel braces, the through-wall bolts and the like are all installed, cement polymerization grouting liquid is poured into the cracks. The angle steel supports and the steel braces are adopted to reinforce lintel cracks of the masonry structure, tensile stress generated by pressure grouting reinforcement can be borne, the method is simple in construction, safe and reliable, the ductility of the structure can be improved, and the anti-collapse capacity of the structure can be enhanced.

Description

Technical Field

[0001] The invention relates to a lintel of a masonry structure reinforced by using angle steel supports and steel tie bars and a construction method thereof, belonging to the technical field of comprehensive reconstruction of old residential quarters. Background Art

[0002] For cracks in existing masonry lintels, pressure grouting is usually used to reinforce them. Pressure grouting is to inject cement polymer grouting liquid into cracks, unsaturated mortar joints, holes and loose masonry structures with the help of compressed air to restore the integrity of the structure, improve the strength and durability of the masonry structure, and improve the waterproof and anti-seepage performance of the masonry structure. After multiple earthquake verifications, this method is safe and reliable, significantly improving the ductility of the structure and enhancing the structure's ability to resist collapse. Cement polymer grouting liquid is the most commonly used masonry grouting liquid. It is a method of adding a certain amount of colloidal suspension agent to pure cement slurry to improve the bonding ability of the slurry, improve the pourability of the slurry, and enhance the strength of the masonry structure. For cracks in masonry lintels, before using pressure grouting to reinforce them, the cracks should be reinforced. Usually, angle steel supports, steel tie bars and gussets are used around the cracks to reinforce the masonry lintels to bear the tensile stress generated by pressure grouting reinforcement. The invention mainly adopts angle steel supports, steel tie bars and gusset plates to reinforce cracks in the lintel of the masonry structure, and then performs pressure grouting reinforcement on the cracks. Summary of the invention

[0003] The present invention proposes a method for reinforcing a masonry structure lintel by using angle steel supports and steel tie rods and a construction method thereof, mainly for reinforcing cracks in existing masonry structure lintels by using pressure grouting reinforcement method. The present invention adopts the following technical solutions:

[0004] A method for reinforcing a masonry structure lintel by using angle steel supports and steel tie bars and a construction method thereof, such as Figures 1-2 As shown, it includes an angle steel support, a gusset plate, a steel tie rod, and a through-wall bolt; the angle steel support is arranged at the lower part of the crack of the masonry structure lintel, and the angle steel support is symmetrically arranged on both sides of the lower part of the original structure lintel; the two ends of the angle steel support are extended 250mm along the wall to form an angle steel support support section, and a flange of the angle steel support of the angle steel support support section is embedded in the mortar joint of the wall, and the embedding depth is the height of the flange; the gusset plate is arranged close to the angle steel support, and the arrangement spacing is one every 300mm, which is used to connect the angle steel supports on both sides of the lower part of the lintel; the gusset plate is welded to the angle steel support; the steel tie rod is symmetrically arranged on both sides of the original structure lintel; one end of the steel tie rod is welded to the angle steel support, and the other end is fastened and connected to the steel tie rod on the other side of the lintel through a nut through a through-wall bolt; after the angle steel support, gusset plate, steel tie rod, through-wall bolt, etc. are all installed, cement polymerization grouting liquid is poured into the crack.

[0005] Furthermore, the angle steel support adopts L50×5 equilateral angle steel.

[0006] Furthermore, the gusset plate is a Q235B steel plate with a thickness of 5 mm and a width of 40 mm.

[0007] Furthermore, the through-wall bolts are M10 bolts, and the diameter of the holes drilled on the original structural lintel is 12 mm.

[0008] Furthermore, the steel tie rod is a Q235B steel plate with a thickness of 5 mm and a width of 50 mm. One end of the steel tie rod is provided with a mounting hole for installing a through-wall bolt with a diameter of 12 mm.

[0009] Furthermore, the cement used in the cement polymerization grouting fluid is ordinary Portland cement with a cement strength grade of 42.5, the sand is fine sand with a particle size of ≤0.5mm, and the water is drinking water or natural clean water.

[0010] The above-mentioned method of using angle steel supports and steel tie bars to reinforce masonry structure lintels and its construction method has the following specific implementation steps:

[0011] Step 1: Provide temporary support for the cracked lintel.

[0012] Step 2: Chisel off the plaster layer on the wall and lintel, and chisel off the 250mm long horizontal joint mortar of the angle steel support section.

[0013] Step 3: Drill through-wall bolt holes with a diameter of 12 mm and blow away the dust.

[0014] Step 4: Install the angle steel supports on both sides of the lower part of the masonry structure lintel, apply cement polymer grouting liquid with a thickness of 3 to 5 mm on the joint surface between the angle steel support, the lower part of the lintel and the wall, and fill the chiseled joints with cement polymer grouting liquid, then embed the angle steel support and press it tightly.

[0015] Step 5: Weld the gusset plate and the angle steel support.

[0016] Step 6: After fastening the steel tie rods on both sides of the lintel in place with M10 through-wall bolts, weld the other end of the steel tie rod to the angle steel support.

[0017] Step 7: Carry out pressure grouting on the cracks of the wall and lintel, inject cement polymer grouting liquid, let it stand for 1 to 2 days, and then remove the temporary support.

[0018] Step 8: Carry out rust-proof treatment on exposed angle steel supports, tie plates, steel tie rods, through-wall bolts, etc.

[0019] Beneficial effects:

[0020] Adopting angle steel supports and steel tie rods to reinforce cracks in masonry lintels can bear the tensile stress generated by pressure grouting reinforcement. This method is simple to construct, safe and reliable, can improve the ductility of the structure, and enhance the structure's ability to resist collapse. It also saves engineering workload, engineering materials, and reduces engineering costs. This method is one of the most cost-effective methods for seismic reinforcement of cracks in existing masonry lintels. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of angle steel supports and steel tie bars used to reinforce masonry lintels;

[0022] Figure 2 for Figure 1 AA cross-section diagram.

[0023] In the figure, 1: angle steel support; 2: tie plate; 3: steel tie rod; 4: through-wall bolt; 5: angle steel support supporting section; 6: nut; 7: lintel; 8: crack; 9: wall; 10: lintel flat arch. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present invention are as follows:

[0025] A method for reinforcing a masonry structure lintel by using angle steel supports and steel tie bars and a construction method thereof, such as Figures 1-2 As shown, it is characterized by comprising an angle steel support 1, a gusset plate 2, a steel tie rod 3, and a through-wall bolt 4; the angle steel support 1 is arranged at the lower part of the crack of the masonry structure lintel 7, and the angle steel support 1 is symmetrically arranged on both sides of the lower part of the original structure lintel 7; both ends of the angle steel support 1 are extended 250mm along the wall 9 to form an angle steel support support section 5, and a flange of the angle steel support 1 of the angle steel support support section 5 is embedded in the mortar joint of the wall 9, and the embedding depth is the height of the flange; the gusset plate 2 is arranged close to the angle steel support 1, The arrangement spacing is one every 300mm, which is used to connect the angle steel supports 1 on both sides of the lower part of the lintel 7; the gusset plate 2 is welded to the angle steel support 1; the steel tie rod 3 is symmetrically arranged on both sides of the original structure lintel 7; one end of the steel tie rod 3 is welded to the angle steel support 1, and the other end is fastened to the steel tie rod 3 on the other side of the lintel 7 through a through-wall bolt 4 through a nut 6; after the angle steel support 1, gusset plate 2, steel tie rod 3, through-wall bolt 4, etc. are all installed, cement polymer grouting liquid is poured into the crack 8.

[0026] Furthermore, the angle steel support 1 adopts an equilateral angle steel of L50×5.

[0027] Furthermore, the gusset plate 2 is a Q235B steel plate with a thickness of 5 mm and a width of 40 mm.

[0028] Furthermore, the through-wall bolt 4 is an M10 bolt, and the diameter of the hole drilled on the original structure lintel 7 is 12 mm.

[0029] Furthermore, the steel tie rod 3 is a Q235B steel plate with a thickness of 5 mm and a width of 50 mm. One end of the steel tie rod 3 is reserved with a mounting hole for mounting a through-wall bolt 4 with a diameter of 12 mm.

[0030] Furthermore, the cement used in the cement polymerization grouting fluid is ordinary Portland cement with a cement strength grade of 42.5, the sand is fine sand with a particle size of ≤0.5mm, and the water is drinking water or natural clean water.

[0031] The above-mentioned method of using angle steel supports and steel tie bars to reinforce masonry structure lintels and its construction method has the following specific implementation steps:

[0032] Step 1: Temporarily support the cracked lintel 7.

[0033] Step 2: Chisel off the plaster layer on the wall 9 and the lintel 7, and chisel off the 250 mm long horizontal seam mortar of the angle steel support support section 5.

[0034] Step 3: Drill the installation hole for the through-wall bolt 4 with a hole diameter of 12 mm and blow away the dust.

[0035] Step 4: Install the angle steel supports 1 on both sides of the lower part of the masonry structure lintel 7, apply cement polymerization grouting liquid with a thickness of 3 to 5 mm on the joint surface between the angle steel support 1 and the lower part of the lintel 7 and the wall 9, and fill the chiseled seams with cement polymerization grouting liquid, then embed the angle steel support 1 and press it tightly.

[0036] Step 5: Weld the gusset plate 2 to the angle steel support 1.

[0037] Step 6: After fastening the steel tie bars 3 on both sides of the lintel 7 into place with M10 through-wall bolts 4, weld the other end of the steel tie bar 3 to the angle steel support 1.

[0038] Step 7: Pressure grouting is performed on the cracks 8 of the wall 9 and the lintel 7 by pouring cement polymer grouting liquid. After standing for 1 to 2 days, the temporary support is removed.

[0039] Step 8: Perform rust-proof treatment on the exposed angle steel supports 1, gusset plates 2, steel tie rods 3, through-wall bolts 4, etc.

[0040] The above is a typical implementation of the present invention, and the specific implementation of the present invention is not limited thereto.

Claims

1. A method for reinforcing a masonry structure lintel using angle steel supports and steel tie rods and a construction method thereof, characterized in that: It comprises an angle steel support (1), a gusset plate (2), a steel tie rod (3), and a through-wall bolt (4); the angle steel support (1) is arranged at the lower part of the crack of the masonry structure lintel (7), and the angle steel support (1) is symmetrically arranged on both sides of the lower part of the original structure lintel (7); both ends of the angle steel support (1) are extended by 250 mm along the wall (9) to form an angle steel support support section (5), and a flange of the angle steel support (1) of the angle steel support support section (5) is embedded in the mortar joint of the wall (9), and the embedding depth is the height of the flange; the gusset plate (2) is arranged close to the angle steel support (1), and the arrangement spacing is every One is arranged every 300 mm to connect the angle steel supports (1) on both sides of the lower part of the lintel (7); the gusset plate (2) is welded to the angle steel supports (1); the steel tie rod (3) is symmetrically arranged on both sides of the original structure lintel (7); one end of the steel tie rod (3) is welded to the angle steel support (1), and the other end is fastened to the steel tie rod (3) on the other side of the lintel (7) through a through-wall bolt (4) through a nut (6); after the angle steel supports (1), gusset plate (2), steel tie rod (3), through-wall bolt (4), etc. are all installed, cement polymer grouting liquid is poured into the crack (8).

2. The method for reinforcing a masonry structure lintel using angle steel supports and steel tie rods and the method for constructing the lintel according to claim 1 is characterized in that: The angle steel support (1) is made of an equilateral angle steel of L50×5.

3. The method for reinforcing a masonry structure lintel using angle steel supports and steel tie rods and the method for constructing the lintel according to claim 1 is characterized in that: The gusset plate (2) is a Q235B steel plate with a thickness of 5 mm and a width of 40 mm.

4. The method for reinforcing a masonry structure lintel using angle steel supports and steel tie rods and the method for constructing the lintel according to claim 1 is characterized in that: The through-wall bolt (4) is an M10 bolt, and the diameter of the hole drilled on the original structural lintel (7) is 12 mm.

5. The method for reinforcing a masonry structure lintel using angle steel supports and steel tie rods and the method for constructing the same according to claim 1, characterized in that: The steel tie rod (3) is a Q235B steel plate with a thickness of 5 mm and a width of 50 mm. One end of the steel tie rod (3) is reserved with a mounting hole for mounting a through-wall bolt (4) with a diameter of 12 mm.

6. The method for reinforcing a masonry structure lintel using angle steel supports and steel tie rods and the method for constructing the same according to claim 1, characterized in that: The cement polymerized grouting liquid uses ordinary silicate cement with a cement strength grade of 42.5, the sand is fine sand with a particle size of ≤0.5 mm, and the water is drinking water or natural clean water.

7. A method for reinforcing a masonry structure lintel using angle steel supports and steel tie rods and a construction method thereof according to any one of claims 1 to 6, characterized in that: Use the following steps: Step 1: Temporarily support the cracked lintel (7). Step 2: Chisel off the plaster layer on the wall (9) and the lintel (7), and chisel off the 250 mm long horizontal seam mortar of the angle steel support support section (5). Step 3: Drill the installation holes for the through-wall bolts (4) with a hole diameter of 12 mm and blow away the dust. Step 4: Install the angle steel supports (1) on both sides of the lower part of the masonry structure lintel (7), apply cement polymer grouting liquid with a thickness of 3 to 5 mm on the joint surface between the angle steel support (1) and the lower part of the lintel (7) and the wall (9), and fill the chiseled seams with cement polymer grouting liquid, then fit the angle steel support (1) and press it tightly. Step 5: Weld the gusset plate (2) and the angle steel support (1). Step 6: After fastening the steel tie bars (3) on both sides of the lintel (7) in place with M10 through-wall bolts (4), weld the other end of the steel tie bars (3) to the angle steel support (1). Step 7: Pressure grouting is performed on the cracks (8) of the wall (9) and the lintel (7), and cement polymer grouting liquid is poured in. After standing for 1 to 2 days, the temporary support is removed. Step 8: Perform rust prevention treatment on the exposed angle steel support (1), the gusset plate (2), the steel tie rod (3), the through-wall bolt (4), etc.

Images