Reinforcing masonry structure lintel crack through profile steel frame joist

Abstract

The utility model relates to a profile steel frame joist for reinforcing masonry structure lintel cracks. The profile steel frame joist 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 utility model relates to a kind of overpass cracks of profile steel frame beam reinforced masonry structure, belong to old community comprehensive reconstruction technical field. BACKGROUND

[0002] For existing masonry structure overpass crack, pressure grouting reinforcement method is usually used for reinforcement.Pressure grouting is to inject cement polymer grouting liquid into masonry structure cracks, under-filled mortar joints, holes and loose masonry structure by means of compressed air, to restore the integrity of the structure, improve the strength and durability of masonry structure, and improve the performance of masonry structure waterproof and anti-permeability.After several earthquakes, this method is safe and reliable, which significantly improves the ductility of the structure and enhances the anti-collapse capacity of the structure.Cement polymer grouting liquid is the most commonly used masonry grouting liquid, which is mixed with a certain amount of colloidal suspending agent in pure cement slurry to improve the bonding capacity of the slurry, improve the groutability of the slurry and enhance the strength of the masonry structure.Before using pressure grouting reinforcement for masonry structure overpass cracks, the cracks should be reinforced.Typically, profile steel frame beam, patch plate and anchoring bolt are used to reinforce the masonry structure overpass around the cracks to bear the tensile stress generated by pressure grouting reinforcement. SUMMARY

[0003] The utility model provides a kind of overpass cracks of profile steel frame beam reinforced masonry structure, mainly for the reinforcement of existing masonry structure overpass crack using pressure grouting reinforcement method, and the utility model takes the following technical solutions:

[0004] The overpass cracks of profile steel frame beam reinforced masonry structure, as shown in Figures 1-3 , including profile steel frame beam, patch plate, anchoring bolt, angle steel patch strip;The profile steel frame beam is welded by equilateral angle steel;The profile steel frame beam is arranged at the lower part of the masonry structure overpass crack and is fixedly connected with the wall at the same time;The profile steel frame beam is arranged symmetrically on both sides of the original structure overpass lower part and the wall;The patch plate is arranged close to the profile steel frame beam, and one root is arranged every 400mm, for connecting the profile steel frame beam on both sides of the overpass lower part and the wall;The patch plate is welded with the profile steel frame beam;The patch plate has a mounting hole in the middle, for passing through the anchoring bolt;The anchoring bolt is pre-buried in the overpass and the wall, for connecting the patch plate with the overpass or the wall, and is connected by the fastening of nut;The angle steel patch strip is used to strengthen the corner strength of the profile steel frame beam;After the profile steel frame beam, patch plate, anchoring bolt and angle steel patch strip are all installed, cement polymer grouting liquid is injected at the crack.

[0005] Further, the profile steel frame beam is composed of L50x5 equilateral angle steel.

[0006] Further, the Q235B steel plate has a thickness of 5 mm and a width of 40 mm.

[0007] Further, the anchor bolt is an M10 bolt, and a hole with a diameter of 14 mm is drilled in the original structure beam or wall, and the epoxy resin glue is implanted.

[0008] Further, the angle steel strip is composed of L25x3 equal angle steel and is pre-welded at the corner of the steel frame support beam.

[0009] Further, 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 ≤0.5 mm, and the water is drinking water or natural clean water.

[0010] The above-mentioned steel frame support beam reinforced masonry structure beam crack and its construction method have the following specific implementation steps:

[0011] Step one: prepare the steel frame support beam, the plate, the anchor bolt, and the angle steel strip according to the design drawing.

[0012] Step two: temporarily support the cracked beam.

[0013] Step three: chisel off the plaster layer on the wall and the beam.

[0014] Step four: drill holes in the wall and the beam, blow off the dust, and implant the anchor bolt.

[0015] Step five: apply the cement polymer grouting liquid to the lower part of the beam and the wall joint surface with a thickness of 3-5 mm, and then embed the steel frame support beam and press it tightly.

[0016] Step six: weld the plate to the steel frame support beam.

[0017] Step seven: fasten the plate and the steel frame support beam on the beam and the wall through the anchor bolt and the nut.

[0018] Step eight: pressure grouting is performed on the wall and the beam crack, and the cement polymer grouting liquid is injected, and after 1-2 days of standing, the temporary support is removed.

[0019] Step nine: perform rust prevention treatment on the exposed steel frame support beam, plate, anchor bolt, and angle steel strip.

[0020] Beneficial effects:

[0021] The type steel frame beam can bear the tensile stress generated by the pressure grouting reinforcement, the method is simple, safe and reliable in construction, can improve the ductility of the structure, enhance the anti-collapse capacity of the structure, simultaneously save the engineering quantity, save the engineering material, and reduce the engineering cost, and the method is one of the methods with high cost performance for the seismic reinforcement of the existing masonry structure beam crack. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The type steel frame beam is used for reinforcing the masonry structure beam crack;

[0023] Figure 2 is the A-A sectional view of Figure 1 .

[0024] Figure 3 is the B-B sectional view of Figure 1 .

[0025] In the drawing, 1 is a type steel frame beam, 2 is a patch plate, 3 is a planted bolt, 4 is an angle steel patch strip, 5 is a crack, 6 is a beam, and 7 is a wall. DETAILED DESCRIPTION

[0026] The specific implementation manner of the utility model is as follows:

[0027] The type steel frame beam is used for reinforcing the masonry structure beam crack, as shown in Figures 1-3 , and the type steel frame beam is characterized by comprising a type steel frame beam 1, a patch plate 2, a planted bolt 3 and an angle steel patch strip 4. The type steel frame beam 1 is welded by equilateral angle steel. The type steel frame beam 1 is arranged at the lower part of the masonry structure beam crack 6 and is fixedly connected with the wall 7. The type steel frame beam 1 is symmetrically arranged at the lower part of the original structure beam 6 and the wall 7. The patch plate 2 is arranged close to the type steel frame beam 1, one patch plate is arranged every 400 mm, and the patch plate is used for connecting the type steel frame beams 1 on the two sides of the lower part of the beam 6 and the wall 7. The patch plate 2 is welded with the type steel frame beam 1. The patch plate 2 is provided with a mounting hole in the middle, and the mounting hole is used for penetrating the planted bolt 3. The planted bolt 3 is embedded in the beam 6 and the wall 7, is used for connecting the patch plate 2 with the beam 6 or the wall 7, and is connected through the fastening of a nut. The angle steel patch strip 4 is used for strengthening the strength of the corner of the type steel frame beam 1. After the type steel frame beam 1, the patch plate 2, the planted bolt 3 and the angle steel patch strip 4 are all installed, cement polymer grouting liquid is injected at the crack 5.

[0028] Further, the type steel frame beam 1 is composed of L50x5 equilateral angle steel.

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

[0030] Further, the anchoring bolt 3 is an M10 bolt, and a hole with a diameter of 14 mm is drilled in the original structure beam 6 or wall 7, and the anchoring bolt 3 is implanted in the epoxy resin glue.

[0031] Further, the angle steel 4 is an isosceles angle steel with an L25x3 size, which is pre-welded at the corner of the steel frame beam 1.

[0032] Further, the cement used in the cement polymer grouting liquid is a common portland cement with a 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.

[0033] The above steel frame beam reinforced masonry structure beam crack and the construction method thereof will be specifically implemented as follows:

[0034] Step one: prepare the steel frame beam 1, the plate 2, the anchoring bolt 3 and the angle steel 4 according to the design drawing.

[0035] Step two: temporarily support the crack beam 6.

[0036] Step three: chisel off the plaster layer on the wall 7 and the beam 6.

[0037] Step four: drill holes on the wall 7 and the beam 6, blow off the dust, and implant the anchoring bolt 3.

[0038] Step five: apply the cement polymer grouting liquid on the lower part of the beam 6 and the joint surface of the wall 7, with a thickness of 3-5 mm, and then embed the steel frame beam 1 and press it tightly.

[0039] Step six: weld the plate 2 and the steel frame beam 1.

[0040] Step seven: fasten the plate 2 and the steel frame beam 1 on the beam 6 and the wall 7 through the anchoring bolt 3 and the fastening nut.

[0041] Step eight: perform pressure grouting on the crack 5 of the wall 7 and the beam 6, and inject the cement polymer grouting liquid, and after 1-2 days, remove the temporary support.

[0042] Step nine: perform rust-proof treatment on the exposed steel frame beam 1, the plate 2, the anchoring bolt 3 and the angle steel 4.

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

Claims

1. A steel frame support beam for reinforcing cracks in masonry structure lintels, characterized in that: The structure includes a steel frame support beam (1), a connecting plate (2), rebar bolts (3), and angle steel connecting strips (4); the steel frame support beam (1) is welded from equilateral angle steel; the steel frame support beam (1) is set at the lower part of the crack in the masonry structure lintel (6) and is simultaneously fixedly connected to the wall (7); the steel frame support beam (1) is symmetrically set on both sides of the lower part of the original structural lintel (6) and the wall (7); the connecting plate (2) is arranged close to the steel frame support beam (1) with a spacing of one plate every 400mm, used to connect the steel frame support beams at the lower part of the lintel (6) and both sides of the wall (7). (1); The lacing plate (2) is welded to the steel frame support beam (1); The lacing plate (2) has a central mounting hole for passing through the anchor bolt (3); The anchor bolt (3) is embedded in the lintel (6) and the wall (7) for connecting the lacing plate (2) to the lintel (6) or the wall (7), and is connected by tightening the nuts; The angle steel lacing strip (4) is used to strengthen the corner strength of the steel frame support beam (1); After the steel frame support beam (1), lacing plate (2), anchor bolt (3) and angle steel lacing strip (4) are all installed, cement polymer grout is injected into the crack (5).

2. The steel frame support beam for reinforcing lintel cracks in masonry structures according to claim 1, characterized in that: The steel frame support beam (1) is composed of L50×5 equilateral angle steel.

3. The steel frame support beam for reinforcing lintel cracks in masonry structures according to claim 1, characterized in that: The gusset plate (2) is a Q235B steel plate with a thickness of 5mm and a width of 40mm.

4. The steel frame support beam for reinforcing lintel cracks in masonry structures according to claim 1, characterized in that: The anchor bolt (3) is an M10 bolt. A hole with a diameter of 14mm is drilled in the original structural beam (6) or wall (7) and epoxy resin is inserted.

5. The steel frame support beam for reinforcing lintel cracks in masonry structures according to claim 1, characterized in that: The angle steel lacing strip (4) is composed of L25×3 equilateral angle steel and is pre-welded to the corner of the steel frame support beam (1).

6. The steel frame support beam for reinforcing lintel cracks in masonry structures according to claim 1, characterized in that: The cement polymer grouting fluid used 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.

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