CN217461586U - A repair structure for damaging type frame roof beam - Google Patents

Abstract

The utility model relates to a building reinforcement technical field provides a repair structure for damaging type frame roof beam, include U shaped steel board, CFRP cloth, the cast-in-place board node assembly of concrete beam column and treat prosthetic damage type frame roof beam and connect, the cast-in-place board node assembly of concrete beam column with treat prosthetic damage type frame roof beam and be connected, the U shaped steel board appears the cracked position of beam-ends slant in beam support negative moment district section and presses the one-sixth symmetrical arrangement of beam span, U shaped steel with the cast-in-place board node assembly of concrete beam column connects, CFRP cloth transversely pastes the crack position appears in positive moment effect district section in the middle of the roof beam. The utility model discloses can solve because of overloading transfinites or because of the whole anti damage that leads to the fact the frame roof beam that floats of basement bottom plate or local anti floating, be applicable to the condition that can't carry out extensive uninstallation behind the earthing. And the damage caused by long service life, steel degradation or concrete damage can be solved.

Description

A repair structure for damaging type frame roof beam

Technical Field

The utility model relates to a building reinforcement technical field specifically is a repair structure for damaging type frame roof beam.

Background

The active concrete frame beams are many built according to the design standards promulgated in the early 70's or 80's of the 20 th century, and the design load grades are generally low. With the increasing use function of the follow-up, the use requirement of heavy electric power facilities increases, the overload and overrun phenomenon is serious, and in addition, the steel corrosion and fatigue, the concrete deterioration and damage and other factors can easily cause the performance degradation of the structure or the component, which is particularly represented as concrete cracking, steel bar buckling and the like. The early-built frame beam has certain damage, and the hogging moment area of the continuous frame beam can generate unfavorable stress states of steel bar compression and concrete slab tension, so that the plate surface is cracked under larger tensile stress. At this time, the ultimate bearing capacity of the structure is often controlled by the yield of the steel bars in the concrete slab in the hogging moment zone. Under the limit state of normal use, the cracking and water seepage of the hogging moment zone plate can cause the degradation of structural rigidity and the reduction of durability, and the existing requirements cannot be met.

In the traditional technology, the reinforcing method of directly processing the damaged frame beam by using the carbon fiber cloth has limited improvement on the bending resistance and the shearing resistance bearing capacity of the frame beam, low material utilization rate and small structural rigidity contribution, is not suitable for reinforcing the using function of a frame structure mainly for controlling structural deformation, and can also cause insufficient rigidity of the reinforced frame beam and overlarge deflection of the reinforced frame beam. And the single steel plate is used for reinforcement, so that the excessive steel consumption of the beam bottom can be caused, and similar reinforcement failure can occur.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a repair structure for damaging type frame roof beam can solve partial defect among the prior art at least.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: the utility model provides a repair structure for damaged frame roof beam, includes U shaped steel board, CFRP cloth, the cast-in-place board node assembly of concrete beam column and treats prosthetic damaged frame roof beam, the cast-in-place board node assembly of concrete beam column is connected with the damaged frame roof beam that treats prosthetic, the U shaped steel board appears the cracked position of beam-ends slant in beam support hogging moment district section and arranges according to one sixth of beam span symmetrical arrangement, U shaped steel with the cast-in-place board node assembly of concrete beam column is connected, CFRP cloth transversely pastes and appears the crack position in the middle of the roof beam positive moment effect district section.

Further, the U-shaped steel plate is formed by welding the steel plates on two sides of the beam of the damaged frame beam to be repaired and the steel plate at the bottom of the beam of the damaged frame beam to be repaired.

Further, the steel plates on the two side edges of the beam are provided with through bolts, the steel plate at the bottom of the beam is provided with bar planting bolts, and the two bolts are fastened through nuts.

Further, a first row of bolt holes and a second row of bolt holes are respectively formed in the side face and the bottom portion, connected with the reinforced concrete beam, of the U-shaped steel plate, the first row of bolt holes penetrate through the through bolts, the nuts are fixed, the second row of bolt holes are formed in the embedded steel bar bolts, the nuts are fixed, and the bolt holes of the steel plate at the bottom of the beam are formed in the embedded steel bar bolts, and the nuts are fixed.

Furthermore, the through bolts and the bar-planting bolts are multiple in number, the diameter of each through bolt and the diameter of each bar-planting bolt are 12mm, the implantation depth is not less than 15d, and the adjacent through bolts and the adjacent bar-planting bolts are arranged at equal intervals.

Further, the cast-in-place plate node assembly of the concrete beam column comprises a cast-in-place plate, an intersected frame beam, the concrete column, a reinforced steel plate and a column body steel plate, wherein the reinforced steel plate is welded with the beam bottom steel plate, the column body steel plate is provided with a column body steel bar planting bolt, and a reinforced plate is arranged at the intersection of the beam end lower part and the column.

Further, structural adhesive is poured between the concrete column and the column body steel plate.

Further, the thickness of the stiffening plate is not less than 5 mm.

Further, the structural adhesive is poured between the U-shaped steel plate and the damaged frame beam to be repaired, and a grouting hole and an exhaust hole are formed in the joint of the U-shaped steel plate and the concrete surface.

Further, the CFRP cloth is bonded on the position where the crack occurs in the middle positive bending moment action section of the beam through resin.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the damage of the frame beam caused by overload overrun or integral anti-floating or local anti-floating of the basement bottom plate can be solved, and the method is suitable for the condition that large-scale unloading cannot be carried out after soil covering. And the damage caused by long service life, steel degradation or concrete damage can be solved. The structure has the advantages of high bearing capacity, high rigidity, reliable stress, good anti-seismic performance and strong constraint capacity.

2. The construction is convenient, the period is short, the construction is simple and effective, the coordination deformation effect of the beam column joint can be effectively enhanced, and the brittle failure of the joint is avoided.

3. The U-shaped steel plate is arranged in the hogging moment section, and because the stress complex area is arranged, the hogging moment resistance bearing capacity of the damaged frame beam is increased, and meanwhile, the shear resistance bearing capacity and the rigidity of the damaged frame beam are improved by utilizing the lateral steel plates.

4. The method can effectively utilize multiple functions of reinforcing the concrete beam by the U-shaped steel plate, obviously improve the bending resistance bearing capacity and the shearing bearing capacity, improve the ductility, effectively inhibit the development of cracks and obviously reduce the deflection of the member.

5. The U-shaped steel plate and the column body steel plate are fixed by the bar planting bolts, the bar planting bolts drive concrete in the length range of the bar planting bolts and the whole steel plate to participate in stress, and the stress and force transmission system is reasonable and reliable.

6. The CFRP cloth is arranged in the middle bending moment section, and the part is usually a U-shaped crack and the control function is the beam bottom positive bending moment function, so that the damage to the middle part of the frame beam can be solved, and the construction speed is increased by utilizing the characteristic of light weight and convenience in construction of the CFRP cloth.

7. The concrete beam column cast-in-place slab node combination body is reinforced by steel coating, and the design principle of strong shear weak bending, strong column weak beam and strong node weak component can be realized

Drawings

Fig. 1 is a schematic structural diagram of a repairing structure for a damaged frame beam according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a cross-sectional view C-C of FIG. 3;

fig. 5 is a schematic view of a stiffening plate for a repair structure of a damaged frame beam according to an embodiment of the present invention;

in the reference symbols: 1. a damaged frame beam to be repaired; 2. a U-shaped steel plate; 3. CFRP cloth; 4. a concrete beam column cast-in-place plate node assembly; 5. structural adhesive; 6. a bottom resin; 7. a stiffening plate; 21. a beam support hogging moment section; 132. a nut; 31. a beam middle positive bending moment action section; 32. the middle section of the beam has a U-shaped crack; 33. a V-shaped groove; 23. steel plates are arranged on two side edges of the beam; 24. a beam bottom steel plate; 25. oblique cracks at the beam ends; 222. planting a rib bolt; 231. penetrating a bolt; 40. casting a plate in situ; 41. a concrete column; 42. a column body steel plate; 44. planting a steel bar bolt on the column body; 401. intersecting the frame beams; 402. and reinforcing the steel plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, an embodiment of the present invention provides a repair structure for a damaged frame beam, including a U-shaped steel plate 2, a CFRP cloth 3, a concrete beam column cast-in-place plate node assembly 4 and a damaged frame beam 1 to be repaired, the concrete beam column cast-in-place plate node assembly 4 is connected with the damaged frame beam 1 to be repaired, the U-shaped steel plate 2 is symmetrically arranged according to one sixth of the beam span at the position where the beam end oblique crack 25 appears in the beam support negative bending moment section 21, the U-shaped steel is connected with the concrete beam column cast-in-place plate node assembly 4, and the CFRP cloth 3 is transversely pasted in the middle of the beam positive bending moment acting section 31 and appears at the crack position. Preferably, the U-shaped steel plate 2 is formed by welding the steel plates 23 on two sides of the beam of the damaged frame beam 1 to be repaired and the steel plate 24 at the bottom of the beam of the damaged frame beam 1 to be repaired. The steel plates 23 on the two sides of the beam are provided with opposite-penetrating bolts 231, the steel plate 24 at the bottom of the beam is provided with a bar-planting bolt 222, and the two are fastened through nuts 132. Referring to fig. 2, a first row of bolt holes and a second row of bolt holes are respectively formed in the side surface and the bottom of the U-shaped steel plate 2 connected to the reinforced concrete beam, the first row of bolt holes penetrate through the through bolts 231 and are fixed by the nuts 132, the second row of bolt holes are fixed by the nuts 132 after the steel bar planting bolts 222 are implanted, and the bolt holes of the steel plate 24 at the bottom of the beam are fixed by the nuts 132 after the steel bar planting bolts 222 are implanted. The cast-in-place concrete beam-column plate node assembly 4 comprises a cast-in-place plate 40, an intersected frame beam 401, a concrete column 41, a reinforced steel plate 402 and a column body steel plate 42, wherein the reinforced steel plate 402 is welded with the beam bottom steel plate 24, the column body steel plate 42 is provided with a column body steel bar planting bolt 44, and a stiffening plate 7 is arranged at the intersection of the beam end lower part and the column. Preferably, the U-shaped steel plate 2 is fully welded to the reinforcing steel plate 402 of the concrete beam-column cast-in-place slab node assembly 4. The CFRP cloth 3 is transversely stuck at the position where the crack appears in the middle positive bending moment action section 31 of the beam, in particular to the position where the U-shaped crack 32 appears in the middle section of the beam. Preferably, the CFRP cloth 3 is transversely attached to the beam middle positive bending moment action section 31 of the damaged frame beam 1 to be repaired, specifically, the bottom resin 6 is coated, and after curing, a smooth surface is formed and then the adhesive resin is coated. Therefore, the structure utilizes the hogging moment of the U-shaped steel plate 2 to resist the bearing capacity and the lateral rigidity, and can obviously improve the shearing resistance bearing capacity and the rigidity of the damaged frame beam; the method can effectively utilize multiple functions of reinforcing the concrete beam by the U-shaped steel plate, obviously improve the shearing bearing capacity, improve the ductility, effectively inhibit the development of cracks and obviously reduce the deflection of the member.

As the utility model discloses the optimization scheme, treat prosthetic damage type frame roof beam 1's roof beam both sides limit steel sheet 23 with treat adopt the model to adopt Q355B level between prosthetic damage type frame roof beam 1's the bottom of a beam steel sheet 24, thickness is not less than 10mm, and connected mode adopts full-length welding to connect, and the welding seam level is II levels, and its butt weld thickness is not less than 6 mm.

As the utility model discloses the optimization scheme, bar planting bolt 222 or to wearing bolt 231 and adopting, the bolt diameter is 12mm, and the implantation depth is not less than 15d, and the distribution interval arranges according to the damage condition of roof beam, can adopt 300 mm.

As the utility model discloses the optimization scheme, U shaped steel board 2 with treat to pour into the structure between prosthetic damage type frame roof beam 1 and glue 5, just U shaped steel board 2 sets up the slip casting hole with concrete surface handing-over department and exhaustsAnd (4) a hole. Preferably, the gap between the concrete column 41 and the steel plate 42 is also filled with structural epoxy resin glue 5. Referring to FIGS. 3 and 4, the CFRP cloth 3 is of type I300 g/m ² The unidirectional high-strength carbon fiber cloth machine braided fabric is prepared by matching epoxy resin impregnating adhesive.

As an optimization scheme of the embodiment of the present invention, please refer to fig. 5, the stiffening plates 7 are respectively disposed at the intersection of the periphery of the reinforced concrete column 41 and the beam end, one side of which is welded to the steel plate at the bottom of the beam, and the other side of which is welded to the steel plate at the column side. Preferably, the type 7 of the stiffening plate adopts Q355B grade, the thickness is not less than 5mm, and the welding seam grade is II grade. The U-shaped steel plate 2 and the column body steel plate 42 are fixed by using the embedded bar bolts 222, the embedded bar bolts 222 drive the concrete in the length range of the embedded bar bolts and the whole steel plate to participate in stress, and the stress and force transmission system is reasonable and reliable; cracks of the reinforced rear beam are uniform, the steel plate with smaller thickness is preferably selected for fully utilizing the strength of the steel plate when the distance between the bar planting bolts 222 is fixed; in order to further improve the reinforcing effect, an unloading reinforcing method is preferably adopted. The CFRP cloth 3 is arranged in the middle bending moment section, and the part is usually a U-shaped crack and the control function is the beam bottom positive bending moment function, so that the damage to the middle part of the frame beam can be solved by adopting the scheme, and meanwhile, the construction speed is increased by utilizing the characteristic of light dead weight and convenient construction of the CFRP cloth 3.

The embodiment of the utility model provides a still provide a repair method of damage type frame roof beam, including following step: s1, finishing a damaged frame beam 1 to be repaired, S2, after finishing the finishing, forming a U-shaped steel plate 2 by the existing structure of the damaged frame beam 1 to be repaired, symmetrically arranging the U-shaped steel plate 2 at the position of a beam end oblique crack 25 in a beam support negative bending moment section 21 according to one sixth of a beam span, S3, connecting the damaged frame beam 1 to be repaired to form a concrete beam column cast-in-place plate node assembly 4, connecting the concrete beam column cast-in-place plate node assembly 4 with the U-shaped steel plate 2, and S4, transversely pasting CFRP cloth 3 at the position of a crack in a beam middle positive bending moment action section 31 of the damaged frame beam 1 to be repaired. Preferably, the specific finishing treatment mode is as follows: the method comprises the following steps of polishing an original cylindrical surface or an original beam surface to be flat by using a handheld electric grinding wheel, polishing small round corners at the periphery of the beam and at the corner parts of the beam, brushing bristles by using a steel wire brush, blowing clean by using compressed air, cleaning the bottom of the damaged frame beam 1 to be repaired and the concrete surface of a concrete column 41 reinforced area of a concrete beam-column cast-in-place plate node assembly 4, repairing, pressing and leveling the uneven surface and the weathered surface by using a chipping method after treatment, repairing, pressing and leveling the adhered surface by using polymer mortar, and wiping the adhered surface by using a degreasing cotton ball and acetone. Post body steel sheet 42 of cast-in-place board node assembly 4 of concrete beam column is attached in post round angle department all around after the rust cleaning, and after the steel sheet is tailor-welded all around, with U shaped steel board 2 after the rust cleaning attached on roof beam both sides limit steel sheet 23 and beam bottom portion steel sheet 24, find the drilling position of waiting prosthetic damage type frame roof beam 1 again, mark out the hole core point, drill and carry out the pore-forming clearance on the surface, fix U shaped steel board 2 behind pore-forming position bar planting bolt 222, and right U shaped steel board 2 with post body steel sheet 42 welds, welds the stiffening plate 7 of beam column juncture again.

Specifically, after finishing treatment, the sizes and the numbers of the U-shaped steel plates 2 and the column body steel plates 42 can be determined according to design, lofting and blanking are carried out, straightening and forming are carried out, holes are drilled in the U-shaped steel plates, and then rust removal is carried out by using a sand blasting or grinding wheel polishing method. After the stiffening plate 7 at the beam-column junction is welded, the joint of the outer edge of the steel plate and the concrete surface is sealed by epoxy resin mortar, an exhaust port is reserved, an injection port is reserved at the upper part of the injection structural adhesive 5, and the steel-clad injection structural adhesive 5 is pressed into the injection port under the pressure of 0.2-0.4 MPa. And finally, sealing the reinforcing surface by cement mortar, and performing anticorrosion and fireproof treatment on the U-shaped steel plate 2, the column body steel plate 42 and the stiffening plate 7. After the steps are completed, the crack of the positive bending moment action section 31 in the middle of the beam is treated, specifically, the corrosion prevention and the fire prevention treatment are firstly carried out.

And measuring and evaluating damage of a U-shaped crack in the positive bending moment action section 31 in the middle of the beam, coating epoxy resin glue on the crack for sealing or performing epoxy resin joint pouring treatment, filling the V-shaped groove 33 with structural glue 5, removing oil stains and miscellaneous scales on the surface of the concrete, and flattening the surface. Wherein, the cracks with the gaps smaller than 0.2mm are coated and sealed by epoxy resin glue; and (5) for cracks with the gaps larger than or equal to 0.2mm, performing crack pouring treatment by using epoxy resin glue. And then uniformly coating resin glue on the bottom layer on the exposed surfaces of the side wall and the bottom of the beam by using a roller brush, and curing the resin glue 6 on the bottom layer to form a smooth surface. And then uniformly smearing epoxy resin impregnating adhesive on the cured bottom resin 6 by using a roller brush, adhering carbon fiber cloth, rolling the carbon fiber cloth back and forth by using a roller during adhering, injecting glue into a needle cylinder for repairing if hollowing occurs, ensuring that the plumpness of an effective adhering surface is 100%, and finally coating a fireproof coating on the carbon fiber cloth.

As the embodiment of the utility model provides an optimization scheme, finishing still includes beam support hogging moment district section 21 carries out the chisel hair earlier and handles, and the reinforced concrete roof beam surface that epoxy resin viscose steel coating was surperficial for clean level and smooth surface.

As the utility model discloses the optimization scheme is boring before planting the muscle hole, survey the existing reinforcing bar position of roof beam body and cylinder, make the position of planting the muscle hole avoids existing reinforcing bar.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a repair structure for damaging type frame roof beam which characterized in that: the concrete beam column cast-in-place plate node assembly is connected with the damaged frame beam to be repaired, oblique cracks of beam ends of beam supports at negative bending moment sections of beam supports are symmetrically arranged according to one sixth of beam spans at the positions of the beam ends, the U-shaped steel is connected with the concrete beam column cast-in-place plate node assembly, and the CFRP cloth is transversely adhered to the beam middle positive bending moment acting sections to form cracks.

2. A repair construction for a damaged frame beam according to claim 1, characterized in that: the U-shaped steel plate is formed by welding the steel plates at two sides of the beam of the damaged frame beam to be repaired and the steel plate at the bottom of the beam of the damaged frame beam to be repaired.

3. A repair construction for a damaged frame beam according to claim 2, wherein: the steel plates on the two side edges of the beam are provided with through bolts, the steel plate at the bottom of the beam is provided with bar planting bolts, and the two bolts are fastened through nuts.

4. A repair construction for a damaged frame beam according to claim 3, wherein: first row bolt hole and second row bolt hole have been seted up respectively on the side that U shaped steel board and reinforced concrete roof beam link to each other and the bottom, first row bolt hole passes to wearing the bolt by the nut is fixed, second row bolt hole by the planting bar bolt is implanted the back by the nut is fixed, the bolt hole of roof beam bottom steel sheet by the planting bar bolt is implanted the back by the nut is fixed.

5. A repair construction for a damaged frame beam according to claim 3, characterized in that: the through bolts and the bar-planting bolts are all provided with a plurality of bolts, the diameter of each through bolt and each bar-planting bolt is 12mm, the implantation depth is not less than 15d, and the adjacent through bolts and the adjacent bar-planting bolts are arranged at equal intervals.

6. A repair construction for a damaged frame beam according to claim 2, characterized in that: the concrete beam column cast-in-place plate node assembly comprises a cast-in-place plate, an intersected frame beam, a concrete column, a reinforced steel plate and a column body steel plate, wherein the reinforced steel plate is welded with the beam bottom steel plate, the column body steel plate is provided with column body embedded steel bar bolts, and a reinforced plate is arranged at the intersection of the beam end lower part and the column.

7. A repair construction for a damaged frame beam according to claim 6, wherein: and structural glue is filled between the concrete column and the column body steel plate.

8. A repair construction for a damaged frame beam according to claim 6, wherein: the thickness of the stiffening plate is not less than 5 mm.

9. A repair construction for a damaged frame beam according to claim 1, characterized in that: and structural adhesive is poured between the U-shaped steel plate and the damaged frame beam to be repaired, and a grouting hole and an exhaust hole are formed in the joint of the U-shaped steel plate and the concrete surface.

10. A repair construction for a damaged frame beam according to claim 1, characterized in that: and the CFRP cloth is bonded on the position of the crack of the beam middle positive bending moment action section through resin.

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