Brickwork structure lintel reinforced by angle steel brackets and steel braces

Abstract

The utility model relates to a masonry structure lintel reinforced by angle steel brackets and steel braces. The masonry structure lintel comprises the angle steel brackets, 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] This utility model relates to a masonry structure lintel supported by angle steel and reinforced with steel tie rods, belonging to the technical field of comprehensive renovation of old residential areas. Background Technology

[0002] For existing masonry lintel cracks, pressure grouting is typically used for reinforcement. Pressure grouting uses compressed air to inject cement-polymer grout into cracks, incomplete mortar joints, holes, and loose or unstable masonry structures. This restores the structural integrity, improves the strength and durability of the masonry structure, and enhances its waterproofing and seepage resistance. Verified by multiple earthquakes, this method is safe and reliable, significantly improving structural ductility and resistance to collapse. Cement-polymer grout is the most commonly used masonry grout; it is made by adding a certain amount of colloidal suspending agent to pure cement slurry to improve its bonding ability, injectability, and overall strength. Before pressure grouting, cracks in masonry lintels should be reinforced. This is usually done by using angle steel supports, steel tie rods, and gusset plates around the cracks to support the tensile stress generated by the pressure grouting. This utility model mainly uses angle steel supports, steel tie rods, and gusset plates to reinforce the cracks in the lintels of masonry structures, and then performs pressure grouting to reinforce the cracks. Utility Model Content

[0003] This utility model proposes a method for reinforcing masonry lintels using angle steel supports and steel tie rods. It primarily addresses the reinforcement of existing masonry lintel cracks using pressure grouting. The technical solution adopted by this utility model is as follows:

[0004] A type of lintel for masonry structures reinforced with angle steel supports and steel tie rods, such as Figures 1-2 As shown, the structure includes angle steel supports, connecting plates, steel tie rods, and through-wall bolts. The angle steel supports are installed at the lower part of the crack in the masonry structure lintel, and are symmetrically arranged on both sides of the lower part of the original lintel. Each end of the angle steel support extends 250mm along the wall to form an angle steel support support section, and one flange of the angle steel support support section is embedded in the mortar joint of the wall, with the embedding depth being the height of the flange. The connecting plates are arranged close to the angle steel supports, with a spacing of one plate every 300mm, for connecting the angle steel supports on both sides of the lower part of the lintel. The connecting plates are welded to the angle steel supports. The steel tie rods are symmetrically arranged on both sides of the original lintel. One end of the steel tie rod is welded to the angle steel support, and the other end is fastened to the steel tie rod on the other side of the lintel by a nut through the through-wall bolt. After all the angle steel supports, connecting plates, steel tie rods, and through-wall bolts are installed, cement polymer grout is injected into the crack.

[0005] Furthermore, the angle steel support is made of L50×5 equilateral angle steel.

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

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

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

[0009] Furthermore, the cement used in the cement polymer grouting liquid is ordinary Portland cement with a 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 specific implementation steps of the above-mentioned method for reinforcing masonry lintels with angle steel supports and steel tie rods are as follows:

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

[0012] Step 2: Remove the plaster layer from the wall and lintel, and remove the mortar from the 250mm long horizontal joint of the angle steel support section.

[0013] Step 3: Drill through-wall bolt holes with a diameter of 12mm 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 grout to the joint surface between the angle steel support and the lower part of the lintel and the wall, with a thickness of 3-5mm. Fill the chisel joint with cement polymer grout, then attach and embed the angle steel support and press it firmly.

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

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

[0017] Step 7: Pressure grouting is performed on the cracks in the walls and lintels. Cement polymer grout is injected, and after standing for 1-2 days, the temporary supports are removed.

[0018] Step 8: Apply rust prevention treatment to exposed angle steel supports, gusset plates, steel tie rods, through-wall bolts, etc.

[0019] Beneficial effects:

[0020] Using angle steel supports and steel tie rods to reinforce cracks in masonry lintels can withstand the tensile stress generated by pressure grouting reinforcement. This method is simple to construct, safe and reliable, and can improve the ductility of the structure and enhance its resistance to collapse. At the same time, it saves on the amount of work, saves on engineering materials, and reduces the project cost. This method is one of the most cost-effective seismic reinforcement methods for existing masonry lintel cracks. Attached Figure Description

[0021] Figure 1 Schematic diagram of a lintel for a masonry structure reinforced with angle steel supports and steel tie rods;

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

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

[0024] The specific implementation of this utility model is as follows:

[0025] A type of lintel for masonry structures reinforced with angle steel supports and steel tie rods, such as Figures 1-2 As shown, the feature is that it includes an angle steel support 1, a connecting plate 2, a steel tie rod 3, and a through-wall bolt 4; the angle steel support 1 is set at the lower part of the crack in the masonry structure lintel 7, and the angle steel support 1 is symmetrically set on both sides of the lower part of the original structural lintel 7; the two ends of the angle steel support 1 extend 250mm along the wall 9 to form an angle steel support support section 5, and one flange of the angle steel support 1 in the angle steel support support section 5 is embedded in the mortar joint of the wall 9, with the embedding depth being the height of the flange; the connecting plate 2 is arranged close to the angle steel support 1. One steel rod is arranged at a spacing of 300mm to connect the angle steel supports 1 on both sides of the lower part of the lintel 7; the connecting plate 2 is welded to the angle steel support 1; the steel tie rod 3 is symmetrically arranged on both sides of the original structural 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 by means of through-wall bolt 4 and nuts 6; after all the angle steel support 1, connecting plate 2, steel tie rod 3, through-wall bolt 4, etc. are installed, cement polymer grout is injected into the crack 8.

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

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

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

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

[0030] Furthermore, the cement used in the cement polymer grouting fluid is ordinary Portland cement with a 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 specific implementation steps of the above-mentioned method for reinforcing masonry lintels with angle steel supports and steel tie rods are as follows:

[0032] Step 1: Provide temporary support for the cracked lintel 7.

[0033] Step 2: Remove the plaster layer from wall 9 and lintel 7, and remove the 250mm long horizontal joint mortar from angle steel support section 5.

[0034] Step 3: Drill the mounting holes for the through-wall bolts 4, with a diameter of 12mm, 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 polymer grout to the joint surface of the angle steel support 1 with the lower part of the lintel 7 and the wall 9, with a thickness of 3-5mm. Fill the chisel joint with cement polymer grout, then attach and embed the angle steel support 1 and press it firmly.

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

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

[0038] Step 7: Pressure grouting is performed on the cracks 8 in the wall 9 and lintel 7. Cement polymer grout is injected, and after standing for 1 to 2 days, the temporary supports are removed.

[0039] Step 8: Apply rust prevention treatment to exposed angle steel supports 1, gusset plates 2, steel tie rods 3, through-wall bolts 4, etc.

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

Claims

1. A reinforced masonry structure lintel using angle steel support, steel bracing, characterized in that: The utility model provides a kind of crack repairing structure of masonry structure, including angle steel support (1), patch plate (2), steel stay (3), wall bolt (4);The angle steel support (1) is arranged in the lower part of masonry structure lintel (7) crack, the angle steel support (1) is symmetrically arranged in the lower part of original structure lintel (7) two sides;The angle steel support (1) two ends are each extended 250mm along wall (9), and form angle steel support supporting section (5), and the wing of angle steel support (1) of angle steel support supporting section (5) is embedded in wall (9) mortar joint, and embedding depth is the height of wing;The patch plate (2) is arranged close to angle steel support (1), and the arrangement interval is every 300mm arrangement one, for connecting the angle steel support (1) of lower part two sides of lintel (7);The patch plate (2) is welded with angle steel support (1);The steel stay (3) is symmetrically arranged in original structure lintel (7) two sides;The steel stay (3) one end is welded with angle steel support (1), and the other end is fastened and connected through nut (6) with the steel stay (3) of other side of lintel (7) through wall bolt (4);After the angle steel support (1), patch plate (2), steel stay (3), wall bolt (4) are all installed, crack (8) is injected cement polymer grouting fluid.

2. The reinforced masonry structure lintel with angle steel support and steel bracing according to claim 1, characterized in that: The angle steel support (1) is equilateral angle steel of L50x5.

3. The reinforced masonry structure lintel with angle steel support and steel bracing according to claim 1, characterized in that: The patch plate (2) is Q235B steel plate with thickness of 5mm and width of 40mm.

4. The reinforced masonry structure lintel with angle steel support and steel tension brace according to claim 1, characterized in that: The wall bolt (4) is M10 bolt, and the hole diameter on original structure lintel (7) is 12mm.

5. The reinforced masonry structure lintel with angle steel support and steel bracing according to claim 1, characterized in that: The steel stay (3) is Q235B steel plate with thickness of 5mm and width of 50mm, and one end of the steel stay (3) is reserved with installation hole for wall bolt (4) with diameter of 12mm.

6. The reinforced masonry structure lintel with angle steel support and steel tension brace according to claim 1, characterized in that: The cement polymer grouting fluid uses ordinary portland cement with strength grade of 42.5, fine sand with particle size of ≤0.5mm, and water is drinking water or natural clean water.

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