Reinforcing masonry structure lintel crack through profile steel frame joist and construction method of reinforcing masonry structure lintel crack

Abstract

The invention relates to a profile steel frame joist reinforced masonry structure lintel crack and a construction method thereof. The profile steel frame joist reinforced masonry structure lintel crack comprises a profile steel frame joist, batten plates, embedded steel bar bolts and angle steel lacing bars. The profile steel frame joist is arranged on the lower portion of the masonry structure lintel crack and fixedly connected with a wall at the same time. The batten plates are tightly attached to the profile steel frame joists and used for connecting the lower portions of the lintels and the profile steel frame joists on the two sides of the wall body; the embedded steel bar bolts are embedded in the lintel and the wall body and are used for connecting the batten plate with the lintel or the wall body; the angle steel lacing bars are used for enhancing the strength of the corners of the profile steel frame joists; after the profile steel frame joists, the batten plates and the like are installed, cement polymerization grouting liquid is poured into the cracks. The profile steel frame joists 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 steel frame support beam for reinforcing cracks in a masonry structure lintel and a construction method thereof, and belongs to the technical field of comprehensive reconstruction of old residential quarters. 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 anti-collapse ability of the structure. Cement polymer grouting liquid is the most commonly used masonry grouting liquid. It is a quantitative colloidal suspension added 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 structure lintels, before using pressure grouting for reinforcement, the cracks should be reinforced. Usually, steel frame joists, gussets and anchor bolts are used around the cracks to reinforce the masonry structure lintels to bear the tensile stress generated by pressure grouting reinforcement. Summary of the invention

[0003] The present invention proposes a steel frame support beam to reinforce cracks in a masonry structure lintel and a construction method thereof, which mainly uses a pressure grouting reinforcement method to reinforce cracks in an existing masonry structure lintel. The present invention adopts the following technical solutions:

[0004] Steel frame joist reinforces cracks in masonry structure lintels and its construction method, such as Figures 1 to 3 As shown, it includes a steel frame support beam, a tie plate, a rebar bolt, and an angle steel tie bar; the steel frame support beam is welded by equilateral angle steels; the steel frame support beam is arranged at the lower part of the crack of the masonry structure lintel and is fixedly connected to the wall at the same time; the steel frame support beam is symmetrically arranged on both sides of the lower part of the lintel of the original structure and on the wall; the tie plate is arranged close to the steel frame support beam, and the arrangement spacing is one every 400mm, which is used to connect the steel frame support beams at the lower part of the lintel and on both sides of the wall; the tie plate is welded to the steel frame support beam; the tie plate has a mounting hole in the center for passing the rebar bolt; the rebar bolt is pre-buried in the lintel and the wall, and is used to connect the tie plate with the lintel or the wall, and is connected by tightening the nut; the angle steel tie bar is used to strengthen the corner strength of the steel frame support beam; after the steel frame support beam, tie plate, rebar bolt, angle steel tie bar, etc. are all installed, cement polymerization grouting liquid is poured at the crack.

[0005] Furthermore, the steel frame support beam is composed of 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 anchor bolts are M10 bolts, a hole with a diameter of 14 mm is drilled on the original structural lintel or wall, and epoxy resin glue is implanted.

[0008] Furthermore, the angle steel tie bars are composed of L25×3 equilateral angle steels, which are pre-welded to the corners of the steel frame support beams.

[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 steel frame joist reinforces the cracks in the masonry structure lintel and the construction method thereof, and the specific implementation steps are as follows:

[0011] Step 1: Prepare steel frame support beams, tie plates, anchor bolts, and angle steel tie bars according to the design drawings.

[0012] Step 2: Provide temporary support for the cracked lintel.

[0013] Step 3: Chisel off the plaster layer on the walls and lintels.

[0014] Step 4: Drill holes on the wall and lintel, blow away the dust and powder, and implant the anchor bolts.

[0015] Step 5: Apply cement polymer grouting liquid with a thickness of 3 to 5 mm on the lower part of the lintel and the wall joint surface, then attach the embedded steel frame support beam and press it tightly.

[0016] Step 6: Weld the tie plate to the steel frame joist.

[0017] Step 7: Use anchor bolts and tighten nuts to fix the tie plates and steel frame beams to the lintels and walls.

[0018] Step 8: 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.

[0019] Step 9: Carry out rust-proof treatment on the exposed steel frame beams, tie plates, anchor bolts, angle steel tie bars, etc.

[0020] Beneficial effects:

[0021] The use of steel frame support beams to reinforce cracks in the lintels of masonry structures 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 lintels of existing masonry structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of cracks in masonry lintels reinforced with steel frame joists;

[0023] Figure 2 for Figure 1 AA section view;

[0024] Figure 3 for Figure 1 BB cross-section diagram.

[0025] In the figure, 1: steel frame support beam; 2: tie plate; 3: anchor bolts; 4: angle steel tie bar; 5: crack; 6: lintel; 7: wall. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is as follows:

[0027] Steel frame joist reinforces cracks in masonry structure lintels and its construction method, such as Figures 1 to 3 As shown, it is characterized by comprising a steel frame joist 1, a gusset plate 2, a reinforcing bolt 3, and an angle steel gusset bar 4; the steel frame joist 1 is welded by equilateral angle steels; the steel frame joist 1 is arranged at the lower part of the crack of the masonry structure lintel 6, and is fixedly connected to the wall 7 at the same time; the steel frame joist 1 is symmetrically arranged on both sides of the lower part of the original structure lintel 6 and the wall 7; the gusset plate 2 is arranged close to the steel frame joist 1, and the arrangement spacing is one every 400mm, which is used to connect the lower part of the lintel 6 and the two sides of the wall 7 The side steel frame support beam 1; the gusset plate 2 is welded to the steel frame support beam 1; the gusset plate 2 has a mounting hole in the center for passing the anchor bolt 3; the anchor bolt 3 is pre-buried in the lintel 6 and the wall 7, and is used for connecting the gusset plate 2 with the lintel 6 or the wall 7, and is connected by tightening the nut; the angle steel gusset bar 4 is used to strengthen the corner strength of the steel frame support beam 1; after the steel frame support beam 1, gusset plate 2, anchor bolt 3, angle steel gusset bar 4, etc. are all installed, cement polymer grouting liquid is poured into the crack 5.

[0028] Furthermore, the steel frame support beam 1 is composed of L50×5 equilateral angle steel.

[0029] Furthermore, the gusset plate 2 is a Q235B steel plate with a thickness of 5 mm and a width of 40 mm.

[0030] Furthermore, the anchor bolt 3 is an M10 bolt, a hole with a diameter of 14 mm is drilled on the original structure lintel 6 or wall 7, and epoxy resin glue is implanted.

[0031] Furthermore, the angle steel tie bar 4 is composed of equilateral angle steel of L25×3, and is pre-welded to the corner of the steel frame support beam 1.

[0032] 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.

[0033] The above-mentioned steel frame joist reinforces the cracks in the masonry structure lintel and the construction method thereof, and the specific implementation steps are as follows:

[0034] Step 1: Prepare the steel frame support beam 1, tie plate 2, anchor bolts 3, and angle steel tie bar 4 according to the design drawings.

[0035] Step 2: Temporarily support the cracked lintel 6.

[0036] Step 3: Chisel off the plaster layer on the wall 7 and the lintel 6.

[0037] Step 4: Drill holes on the wall 7 and the lintel 6, blow away the dust, and implant the anchor bolts 3.

[0038] Step 5: Apply cement polymer grouting liquid with a thickness of 3 to 5 mm on the lower part of the lintel 6 and the joint surface of the wall 7, and then stick the embedded steel frame joist 1 and press it tightly.

[0039] Step six: Weld the gusset plate 2 to the steel frame joist 1.

[0040] Step 7: Fix the gusset plate 2 and the steel frame support beam 1 to the lintel 6 and the wall 7 by using the anchor bolts 3 and tightening the nuts.

[0041] Step 8: Perform pressure grouting on the cracks 5 of the wall 7 and the lintel 6, inject cement polymer grouting liquid, let it stand for 1 to 2 days, and then remove the temporary support.

[0042] Step nine: Carry out rust-proof treatment on the exposed steel frame support beam 1, tie plate 2, anchor bolt 3, angle steel tie bar 4, etc.

[0043] The above is a typical implementation of the present invention, and the specific implementation of the present invention is not limited thereto.

Claims

1. Steel frame joist reinforces cracks in masonry structure lintels and its construction method, as shown in Figures 1 to 3, characterized in that: The invention comprises a steel frame support beam (1), a tie plate (2), a reinforcing bolt (3), and an angle steel tie bar (4); the steel frame support beam (1) is welded by equilateral angle steels; the steel frame support beam (1) is arranged at the lower part of the crack of the masonry structure lintel (6), and is fixedly connected to the wall (7); the steel frame support beam (1) is symmetrically arranged on both sides of the lower part of the original structure lintel (6) and the wall (7); the tie plate (2) is arranged close to the steel frame support beam (1), and the arrangement spacing is one every 400 mm, and is used to connect the steel frame support beams (1) at the lower part of the lintel (6) and on both sides of the wall (7). 1); the tie plate (2) is welded to the steel frame support beam (1); the tie plate (2) has a mounting hole in the center for passing the anchor bolt (3); the anchor bolt (3) is pre-buried in the lintel (6) and the wall (7) for connecting the tie plate (2) to the lintel (6) or the wall (7) and is connected by tightening nuts; the angle steel tie bar (4) is used to strengthen the corner strength of the steel frame support beam (1); after the steel frame support beam (1), tie plate (2), anchor bolt (3), angle steel tie bar (4) and the like are all installed, cement polymer grouting liquid is poured into the crack (5).

2. The steel frame joist reinforced masonry structure lintel cracks and the construction method thereof according to claim 1 are characterized by: The steel frame support beam (1) is composed of L50×5 equilateral angle steel.

3. The steel frame joist reinforced masonry structure lintel cracks and the construction method thereof according to claim 1 are characterized by: The gusset plate (2) is a Q235B steel plate with a thickness of 5 mm and a width of 40 mm.

4. The steel frame joist reinforced masonry structure lintel cracks and the construction method thereof according to claim 1 are characterized by: The anchor bolt (3) is an M10 bolt, and a hole with a diameter of 14 mm is drilled on the original structural lintel (6) or wall (7), and epoxy resin glue is implanted.

5. The steel frame joist reinforced masonry structure lintel cracks and the construction method thereof according to claim 1 are characterized by: The angle steel tie bar (4) is composed of L25×3 equilateral angle steels and is pre-welded to the corners of the steel frame support beam (1).

6. The steel frame joist reinforced masonry structure lintel cracks and the construction method thereof 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. The steel frame joist reinforced masonry structure lintel cracks and the construction method thereof according to any one of claims 1 to 6, characterized in that: Use the following steps: Step 1: Prepare the steel frame support beam (1), tie plate (2), anchor bolts (3), and angle steel tie bars (4) according to the design drawings. Step 2: Temporarily support the cracked lintel (6). Step 3: Chisel off the plaster layer on the wall (7) and the lintel (6). Step 4: Drill holes on the wall (7) and the lintel (6), blow away the dust, and implant the anchor bolts (3). Step 5: Apply cement polymer grouting liquid to the joint surface of the lower part of the lintel (6) and the wall (7) with a thickness of 3 to 5 mm, and then attach the embedded steel frame support beam (1) and press it tightly. Step 6: Weld the tie plate (2) to the steel frame joist (1). Step 7: Fix the tie plate (2) and the steel frame support beam (1) to the lintel (6) and the wall (7) by using the anchor bolts (3) and tightening the nuts. Step 8: Pressure grouting is performed on the cracks (5) of the wall (7) and the lintel (6), and cement polymer grouting liquid is poured in. After standing for 1 to 2 days, the temporary support is removed. Step 9: Anti-rust treatment is performed on the exposed steel frame joists (1), tie plates (2), anchor bolts (3), angle steel tie bars (4), etc.

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