Reinforcing masonry structure lintel crack through steel plate wedges and angle steel supports and construction method of reinforcing masonry structure lintel crack through steel plate wedges and angle steel supports

Abstract

The invention relates to a masonry structure lintel crack reinforced through steel plate wedges and angle steel supports and a construction method thereof. The masonry structure lintel crack reinforced through the steel plate wedges and the angle steel supports comprises the angle steel supports, the steel plate wedges and batten plates. The angle steel supports are arranged on the lower portion of a masonry structure lintel crack and symmetrically arranged on the two sides of the lower portion of an original structure lintel. The steel plate wedge is composed of a wedge opening and a wedge tail, and the steel plate wedge is symmetrically driven into the deep position of the crack from the two sides of the lintel. The batten plate is tightly attached to the angle steel bracket and is welded; after the angle steel supports, the steel plate wedges and the batten plates are all installed, cement polymerization grouting liquid is poured into the cracks. The steel plate wedges and the angle steel brackets are adopted to reinforce lintel cracks of the masonry structure, tensile stress generated by pressure grouting reinforcement can be borne, 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 method for reinforcing cracks in a lintel of a masonry structure by using steel plate wedges and angle steel supports and a construction method thereof, and belongs to the technical field of comprehensive reconstruction of old residential areas. Background Art

[0002] For cracks in existing masonry structure lintels, pressure grouting is usually used for reinforcement. Pressure grouting is to inject cement polymer grouting liquid into cracks, incomplete 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 pure cement slurry with a certain amount of colloidal suspension added to improve the bonding ability of the slurry, improve the pourability of the slurry, and enhance the strength of the masonry structure. Before using pressure grouting to reinforce cracks in masonry structure lintels, the cracks should be reinforced. Steel plate wedges, angle steel supports, etc. are often used for reinforcement to bear the tensile stress generated by pressure grouting reinforcement. Summary of the invention

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

[0004] A method for reinforcing cracks in masonry lintels by using steel plate wedges and angle steel supports and a construction method thereof, such as Figures 1 to 4 As shown, it includes an angle steel support, a steel plate wedge and a tie plate; 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 steel plate wedge is composed of a wedge mouth and a wedge tail, and the steel plate wedge is symmetrically driven into the depth of the crack on both sides of the lintel; the tie plate is arranged close to the angle steel support; there are two tie plates, and the arrangement interval is 500mm, which are used to connect the angle steel supports on both sides of the lower part of the lintel; the tie plate is welded to the angle steel support; after the angle steel support, steel plate wedge and tie plate are all installed, cement polymer grouting liquid is poured into the crack.

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

[0006] Furthermore, the steel plate wedge is a Q235B steel plate, the thickness of the wedge mouth is 2 mm, and the thickness of the wedge tail is 15 mm.

[0007] Furthermore, the height h of the steel plate wedge is the height H of the flat arch of the lintel, and the width b of the steel plate wedge is (1 / 2B-15) mm of the lintel width.

[0008] Furthermore, the gusset plate is a Q235B steel plate with a thickness of 5 mm and a width of 40 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 steel plate wedges and angle steel supports to reinforce cracks in 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: Drive steel wedges symmetrically from both sides of the lintel. After the steel wedges are tightened, cut off the excess steel wedge metal outside the exposed lintel.

[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: 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.

[0017] Step 7: Carry out rust-proof treatment on the exposed angle steel supports and supporting plates.

[0018] Beneficial effects:

[0019] The use of steel plate wedges, angle steel supports and tie plates to reinforce cracks in masonry structure lintels can bear the tensile stress generated by pressure grouting reinforcement, improve the ductility of the structure, and enhance the structure's ability to resist collapse. At the same time, 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 structure lintels. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of strengthening cracks in masonry lintels with steel plate wedges and angle steel supports;

[0021] Figure 2 for Figure 1 AA section view;

[0022] Figure 3 This is the front view of the steel plate wedge;

[0023] Figure 4 BB section view of the steel plate wedge.

[0024] In the figure, 1: angle steel support; 2: steel plate wedge; 3: tie plate; 4: angle steel support supporting section; 5: wall; 6: lintel flat arch; 7: lintel; 8: crack; 9: wedge mouth; 10: wedge tail. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is as follows:

[0026] A method for reinforcing cracks in masonry lintels by using steel plate wedges and angle steel supports and a construction method thereof, such as Figures 1 to 4 As shown, it is characterized in that: it includes an angle steel support 1, a steel plate wedge 2, and a gusset plate 3; 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; the two ends of the angle steel support 1 are extended 250mm along the wall 5 to form an angle steel support support section 4, and a flange of the angle steel support 1 of the angle steel support support section 4 is embedded in the mortar joint of the wall 5, and the embedding depth is the height of the flange; the steel plate wedge 2 is composed of a wedge mouth 9 and a wedge tail 10, and the steel plate wedge 2 is symmetrically driven into the two sides of the lintel 7 to the depth of the crack 8; the gusset plate 3 is arranged close to the angle steel support 1; the gusset plates 3 are two, and the arrangement interval is 500mm, which are used to connect the angle steel supports 1 on both sides of the lower part of the lintel 7; the gusset plate 3 is welded to the angle steel support 1; after the angle steel support 1, steel plate wedge 2, and gusset plate 3 are all installed, cement polymerization grouting liquid is poured into the crack 8.

[0027] Furthermore, the angle steel support 1 adopts an equilateral angle steel of L50×5.

[0028] Furthermore, the steel plate wedge 2 is a Q235B steel plate, the thickness of the wedge mouth 9 is 2 mm, and the thickness of the wedge tail 10 is 15 mm.

[0029] Furthermore, the height h of the steel plate wedge 2 is the height H of the lintel flat arch 6, and the width b of the steel plate wedge 2 is (1 / 2B-15) mm of the width of the lintel 7.

[0030] Furthermore, the gusset plate 3 is a Q235B steel plate with a thickness of 5 mm and a width of 40 mm.

[0031] 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.

[0032] The above-mentioned method of using steel plate wedges and angle steel supports to reinforce cracks in masonry structure lintels and its construction method has the following specific implementation steps:

[0033] Step 1: Temporarily support the cracked lintel 7.

[0034] Step 2: Chisel off the plaster layer on the wall 5 and the lintel 7, and chisel off the 250mm long horizontal seam mortar of the angle steel support support section 4.

[0035] Step 3: Drive the steel plate wedges 2 symmetrically from both sides of the lintel 7. After the steel plate wedges 2 are tightened, cut off the excess steel plate wedge 2 metal outside the exposed lintel 7.

[0036] 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 5, and fill the chiseled seams with cement polymerization grouting liquid, then embed the angle steel support 1 and press it tightly.

[0037] Step 5: Weld the gusset plate 3 and the angle steel support 1.

[0038] Step 6: Perform pressure grouting on the cracks 8 of the wall 5 and the lintel 7, inject cement polymer grouting liquid, let it stand for 1 to 2 days, and then remove the temporary support.

[0039] Step 7: Perform rust-proof treatment on the exposed angle steel support 1 and the supporting plate 3.

[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 cracks in masonry lintels using steel plate wedges and angle steel supports and a construction method thereof, as shown in FIGS. 1 to 4, characterized in that: The invention comprises an angle steel support (1), a steel plate wedge (2), and a gusset plate (3); 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; the two ends of the angle steel support (1) are respectively extended by 250mm along the wall (5) to form an angle steel support support section (4), and a flange of the angle steel support (1) of the angle steel support support section (4) is embedded in the mortar joint of the wall (5), and the embedding depth is the height of the flange; the steel plate wedge (2) is formed by the wedge mouth (9) and wedge tail (10), steel plate wedges (2) are symmetrically driven into the depth of the crack (8) on both sides of the lintel (7); the gusset plates (3) are arranged close to the angle steel supports (1); there are two gusset plates (3), which are arranged at a spacing of 500mm and are used to connect the angle steel supports (1) on both sides of the lower part of the lintel (7); the gusset plates (3) are welded to the angle steel supports (1); after the angle steel supports (1), steel plate wedges (2) and gusset plates (3) are all installed, cement polymer grouting liquid is poured into the crack (8).

2. The method for reinforcing cracks in masonry lintels by using steel plate wedges and angle steel supports according to claim 1, characterized in that: The angle steel support (1) is made of an equilateral angle steel of L50×5.

3. The method for reinforcing cracks in masonry lintels by using steel plate wedges and angle steel supports according to claim 1 is characterized in that: The steel plate wedge (2) is a Q235B steel plate, the thickness of the wedge mouth (9) is 2 mm, and the thickness of the wedge tail (10) is 15 mm.

4. The method for reinforcing cracks in masonry lintels by using steel plate wedges and angle steel supports according to claim 1 is characterized in that: The height h of the steel plate wedge (2) is the height H of the lintel flat arch (6), and the width b of the steel plate wedge (2) is (1 / 2B-15) mm of the width of the lintel (7).

5. The method for reinforcing cracks in masonry lintels by using steel plate wedges and angle steel supports according to claim 1 is characterized in that: The gusset plate (3) is a Q235B steel plate with a thickness of 5 mm and a width of 40 mm.

6. The method for reinforcing cracks in masonry lintels by using steel plate wedges and angle steel supports 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 cracks in masonry lintels using steel plate wedges and angle steel supports 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 (5) and the lintel (7), and chisel off the 250 mm long horizontal joint mortar of the angle steel support support section (4). Step 3: symmetrically drive the steel plate wedges (2) from both sides of the lintel (7). After the steel plate wedges (2) are tightly inserted, the excess metal of the steel plate wedges (2) outside the exposed lintel (7) is cut off. 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 (5), 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 (3) and the angle steel support (1). Step 6: Pressure grouting is performed on the cracks (8) of the wall (5) 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 7: Perform rust prevention treatment on the exposed angle steel support (1) and the gusset plate (3).

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