Wrapping profile steel reinforcement construction process based on old building reconstruction project

Abstract

The invention discloses a steel-encased reinforcement construction technology based on old building reconstruction engineering. The steel-encased reinforcement construction technology comprises the following steps of construction preparation, earth excavation of columns needing to be reinforced, paying off, concrete surface grinding, steel plate grinding, assembling and welding, pipe burying, high-pressure glue injection and completion acceptance. Before construction, the reinforcing position, the actual size, angle steel needed by the reinforcing column and batten plates are carefully rechecked, wrong pasting and waste are prevented, and the construction period is effectively shortened; the glue injection pipe is embedded in the steel, glue is injected into the gap between the steel and the concrete through the glue injection pipe, on one hand, holes do not need to be drilled in the steel, the glue injection efficiency is improved, and on the other hand, glue enters the steel through the glue injection pipe and is not prone to leakage; the steel-clad reinforcing method can effectively improve the stress condition of the stress part of the old building, meanwhile, the size of the stress part is not increased, the effect of achieving two purposes at a time is achieved, meanwhile, the construction period is short, and the steel-clad reinforcing method is an effective method for reinforcing the stress part of the old building.

Description

Technical Field

[0001] The invention relates to the technical field of reinforcement construction, in particular to an outsourcing steel reinforcement construction process for an old building renovation project. Background Art

[0002] At present, there are a large number of old buildings in my country. Due to the lack of awareness of earthquake disasters and the lack of awareness and popularization of earthquake-resistant technology at that time, and the economic conditions at that time, the investment in housing construction was still very limited. The existing masonry houses have basically preserved the original characteristics in terms of layout and structural form: the seismic structure and structural layout are unreasonable, and the overall lack of out-of-plane constraints on the roof truss makes its seismic performance relatively weak compared to other structural forms. When resisting lateral horizontal earthquakes, it usually cracks with very little deformation, and then the cracks develop rapidly until it collapses suddenly. The degree of damage is large and there is no obvious sign, posing a huge threat to people's lives and property safety.

[0003] Since the concrete grade of some connecting beams in the previous design was insufficient, the load capacity of the beams and columns could not meet the requirements, and the columns, shear walls and some beams of the original building needed to be reinforced. The existing reinforcement generally involves adding beams to the original beams and columns, but this will occupy a large area, resulting in a poor overall spatial effect. At present, some outsourced steel processing and construction methods are used, but there are the following problems: (1) Before construction, no effective preparation work is carried out, which can easily lead to waste of materials and delays in construction; (2) When injecting glue, only a few holes are drilled in the steel, and then glue is injected into the steel through the holes. On the one hand, drilling a few holes will increase the number of processes, reduce work efficiency and prolong the construction period. On the other hand, when injecting glue through the holes, the glue is easily discharged from other holes, making it difficult to fill the gap between the steel and the concrete. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a construction process for externally encased steel reinforcement for old building renovation projects to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A construction process for reinforcing an old building with outsourced steel profiles for renovation projects, comprising the following steps:

[0007] S1: Construction preparation: Before construction, the reinforcement position, actual size, angle steel and gusset plates required for the reinforcement column must be carefully checked to prevent mis-attachment and waste;

[0008] S2: Excavate the columns to be reinforced. The excavation range of each foundation is a rectangular area of ​​1.5mx1.5m, and the depth is excavated to the foundation surface;

[0009] S3: Laying out the lines: Measure and lay out the grinding control line at the position of the concrete steel package, and add the steel package position line after the grinding work is completed;

[0010] S4: Concrete surface grinding: Grind away the concrete floating layer until the solid new structure surface is completely exposed;

[0011] S5: Steel plate grinding: The steel bonding surface must be ground and rust-removed until the steel plate texture is exposed;

[0012] S6: Assembly and welding: Assemble the steel materials according to the requirements of the drawings and the actual situation on site. After the assembly is in place, the gusset plates are spot welded and fixed according to the requirements of the laying out. After confirmation, fix them and then weld. After the welding is completed, the person in charge on site will check the welding work;

[0013] S7: Pipe embedding: After the weld is inspected and qualified, epoxy mortar is used to seal the edge of the steel material, and the location of the buried pipe is determined based on the actual situation on site; if the pipe is not buried, several equidistant injection holes can be drilled on the surface of the steel material;

[0014] S8: High-pressure glue injection: inject structural glue into the steel through the glue injection hole, so that the structural glue gradually fills the gap between the steel and the concrete;

[0015] S9: Completion acceptance: After the structural adhesive is cured, use a small hammer to gently tap the steel surface and judge the bonding effect from the sound. If there are individual hollow sounds, it means that the part is not dense and must be filled with high-pressure glue injection.

[0016] Preferably, in step S1, the construction preparation includes the following steps:

[0017] Step 1: Organize a drawing review and raise questions in a timely manner;

[0018] Step 2: Before construction, the production manager and construction workers will give technical instructions to each team;

[0019] Step 3: Lay out the pasting position on site according to the drawings and the axis position provided by the general contractor;

[0020] Step 4: Check the surface of the concrete to be reinforced. If there are cracks, they should be treated according to the notification to the design unit;

[0021] Step 5: Classify and place the steel materials according to different installation locations and hang signs to indicate them;

[0022] Step 6: Before applying anti-rust paint, the exposed parts of the steel must be derusted, oil stains must be wiped off with acetone, and the steel must be kept dry.

[0023] Preferably, in step S2, the excavated earth is piled on site and backfilled on site after the construction is completed.

[0024] Preferably, in step S4, the parts of the concrete surface that show deterioration phenomena such as peeling, hollowing, honeycombing, corrosion, etc. should be removed and repaired with specified materials, and the cracked parts should be sealed first; small fillets should be ground at right angles and blown clean with compressed air.

[0025] Preferably, in step S5, the steel plate is ground from one end to the other end, the grain of the steel plate is ground, and the ground grain is perpendicular to the force-bearing surface of the pasting component. After grinding, it is wiped clean with a dry cloth or acetone before pasting, and the metallic luster should be exposed. The surface treatment should not be stained with water, oil and dust.

[0026] Preferably, in step S7, if glue injection pipes are buried, structural glue is injected from the glue injection pipes during glue injection until all the glue injection pipes are fully injected.

[0027] Preferably, in step S8, if the pipe is not buried, a number of equidistant glue injection holes can be drilled on the surface of the steel, the diameter of the glue injection holes is 5-8mm, and the spacing is not more than 500mm; when injecting glue, the vertical direction is in a sequence from bottom to top, and the horizontal direction is in a sequence in the same direction. When injecting glue, wait until the next glue injection hole overflows glue, and inject glue in sequence until all the glue injection holes are injected; the last glue injection hole is used as an air outlet, and glue does not need to be injected. After the glue injection is completed, the residual structural glue is cleaned.

[0028] Preferably, the structural adhesive in step S8 is a modified epoxy resin adhesive.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) Before construction, the reinforcement position, actual size, angle steel and tie plates required for the reinforcement column will be carefully checked to prevent mis-pasting and waste, effectively shortening the construction period.

[0031] (2) By burying a glue injection tube in the steel, glue is injected into the gap between the steel and the concrete through the glue injection tube. On the one hand, there is no need to drill holes in the steel, which improves the efficiency of glue injection. On the other hand, the glue enters the steel through the glue injection tube, and the glue is not easy to leak.

[0032] (3) The steel reinforcement method can effectively improve the stress of the load-bearing components of old buildings without increasing the volume of the load-bearing components, achieving the effect of killing two birds with one stone. At the same time, the construction period is relatively short, which is an effective way to reinforce the load-bearing components of old buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a process flow chart of the present invention; DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1 , a construction process for reinforcing old buildings with outsourced steel profiles, comprising the following steps:

[0037] S1: Construction preparation: Before construction, the reinforcement position, actual size, angle steel and gusset plates required for the reinforcement column must be carefully checked to prevent mis-attachment and waste;

[0038] Specifically,

[0039] Step 1: Organize a drawing review and raise questions in a timely manner;

[0040] Step 2: Before construction, the production manager and construction workers will give technical instructions to each team;

[0041] Step 3: Lay out the pasting position on site according to the drawings and the axis position provided by the general contractor;

[0042] Step 4: Check the surface of the concrete to be reinforced. If there are cracks, they should be treated according to the notification to the design unit;

[0043] Step 5: Classify and place the steel materials according to different installation locations and hang signs to indicate them;

[0044] Step 6: Before applying anti-rust paint, the exposed parts of the steel must be derusted, oil stains must be wiped off with acetone, and the steel must be kept dry.

[0045] S2: Excavate the columns to be reinforced. The excavation range of each foundation is a rectangular area of ​​1.5mx1.5m, and the depth is excavated to the foundation surface. The excavated soil is piled on site and backfilled on site after the construction is completed.

[0046] S3: Laying out the lines: Measure and lay out the grinding control line at the position of the concrete steel package, and add the steel package position line after the grinding work is completed;

[0047] S4: Concrete surface grinding: Grind off the concrete floating layer until the solid new structure surface is completely exposed; the parts of the concrete surface that have deterioration phenomena such as peeling, hollowing, honeycombing, corrosion, etc. should be removed and repaired with designated materials, and the cracks should be sealed first; grind small fillets at right angles and blow them clean with compressed air;

[0048] S5: Steel plate grinding: The bonding surface of the steel material must be ground and rust-free until the steel plate texture is exposed; the steel plate should be ground from one end to the other, and the steel plate texture should be ground straight, and the grinding texture should be perpendicular to the force-bearing surface of the bonding component. After grinding, wipe it clean with a dry cloth or acetone before bonding, and the metallic luster should be exposed. The surface treatment should not be stained with water, oil and dust.

[0049] S6: Assembly and welding: Assemble the steel materials according to the requirements of the drawings and the actual situation on site. After the assembly is in place, the gusset plates are spot welded and fixed according to the requirements of the laying out. After confirmation, fix them and then weld. After the welding is completed, the person in charge on site will check the welding work;

[0050] S7: Pipe embedding: After the weld is inspected and qualified, epoxy mortar is used to seal the edge of the steel, and the buried pipe position of the injection pipe is determined according to the actual situation on site; when injecting glue, inject the structural glue from the injection pipe until all the injection pipes are fully injected;

[0051] S8: High-pressure glue injection: injecting structural glue into the steel through the glue injection pipe, so that the structural glue gradually fills the gap between the steel and the concrete, and the structural glue is a modified epoxy resin adhesive;

[0052] S9: Completion acceptance: After the structural adhesive is cured, use a small hammer to gently tap the steel surface and judge the bonding effect from the sound. If there are individual hollow sounds, it means that the part is not dense and must be filled with high-pressure glue injection.

[0053] Among them, when performing the above steps, you need to pay attention to the following situations

[0054] 1. Quality requirements for structural adhesives:

[0055] When using externally bonded steel to reinforce the original concrete components, modified epoxy resin adhesive must be used for pouring at the interface between concrete and steel. The modified epoxy resin adhesive used for external steel must comply with the relevant requirements of the "Specification for the Reinforcement of Concrete Structures" GB50367-2013. It is strictly forbidden to use ethylenediamine as a modified epoxy resin curing agent in the adhesive for load-bearing structures; it is strictly forbidden to add volatile harmful solvents and non-reactive diluents.

[0056] 2. Steel plate requirements

[0057] (1) Steel materials entering the site must have a factory certificate, quality assurance certificate, and inspection and retest report. The steel materials used must comply with national standards and specifications.

[0058] (2) Severe corrosion is not allowed on incoming steel.

[0059] (3) The grade of angle steel and steel plate should be consistent with the design, and their mechanical properties should meet the requirements of the specifications.

[0060] 3. Safety matters

[0061] (1) The raw materials used to prepare the adhesive should be stored in a sealed manner and away from direct exposure to fire sources; the preparation and use sites must be well ventilated; operators should wear work clothes, protective masks and gloves.

[0062] (2) Cleaning agent acetone is a flammable substance and should be managed by a dedicated person. Operators should be strictly prohibited from smoking during use to prevent fires. The workplace should be equipped with various necessary fire extinguishers for rescue purposes.

[0063] (3) Steel materials should be stacked away from electrical equipment and power sources, or reliable protective measures should be taken.

[0064] (4) Corrosion should be avoided during material stacking.

[0065] (5) In addition to the three safety items, construction workers on site must also wear protective glasses and masks and long-sleeved work clothes during the grinding and pasting process to prevent dust from entering the eyes and lungs, and the glue from corrosive damage to the skin.

[0066] (6) On-site spot welding construction personnel must be certified and obtain a fire permit.

[0067] (7) When welding angle steel, someone must be on guard and fire-fighting equipment must be placed in a conspicuous location on the construction site.

[0068] Example 2

[0069] On the basis of Example 1, in step S8, if the pipe is not buried, a number of equidistant glue injection holes can be drilled on the surface of the steel material, the diameter of the glue injection holes is 5-8mm, and the spacing is not more than 500mm; when injecting glue, the vertical direction is in a sequence from bottom to top, and the horizontal direction is in a sequence in the same direction. When injecting glue, wait until the next glue injection hole overflows glue, and inject glue in sequence until all the glue injection holes are injected; the last glue injection hole is used as an air outlet, and glue does not need to be injected. After the glue injection is completed, the residual structural glue is cleaned.

[0070] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction process for reinforcing old buildings with outsourced steel profiles, characterized in that: The following steps are involved: S1: Construction preparation: Before construction, the reinforcement position, actual size, angle steel and gusset plates required for the reinforcement column must be carefully checked to prevent mis-attachment and waste; S2: Excavate the columns to be reinforced. The excavation range of each foundation is a rectangular area of ​​1.5mx1.5m, and the depth is excavated to the foundation surface; S3: Laying out the lines: Measure and lay out the grinding control line at the position of the concrete steel package, and add the steel package position line after the grinding work is completed; S4: Concrete surface grinding: Grind away the concrete floating layer until the solid new structure surface is completely exposed; S5: Steel plate grinding: The steel bonding surface must be ground and rust-removed until the steel plate texture is exposed; S6: Assembly and welding: Assemble the steel materials according to the requirements of the drawings and the actual situation on site. After the assembly is in place, the gusset plates are spot welded and fixed according to the requirements of the laying out. After confirmation, fix them and then weld. After the welding is completed, the person in charge on site will check the welding work; S7: Pipe burial: After the weld is inspected and qualified, epoxy mortar is used to seal the edge of the steel material, and the buried position of the injection pipe is determined according to the actual situation on site; S8: High-pressure glue injection: Inject structural glue into the steel through the glue injection pipe, so that the structural glue gradually fills the gap between the steel and the concrete; if the pipe is not buried, several equidistant glue injection holes can be drilled on the surface of the steel; S9: Completion acceptance: After the structural adhesive is cured, use a small hammer to gently tap the steel surface and judge the bonding effect from the sound. If there are individual hollow sounds, it means that the part is not dense and must be filled with high-pressure glue injection.

2. The outsourcing steel reinforcement construction process for old building renovation project according to claim 1 is characterized by: In step S1, the construction preparation includes the following steps: Step 1: Organize a drawing review and raise questions in a timely manner; Step 2: Before construction, the production manager and construction workers will give technical instructions to each team; Step 3: Lay out the pasting position on site according to the drawings and the axis position provided by the general contractor; Step 4: Check the surface of the concrete to be reinforced. If there are cracks, they should be treated according to the notification to the design unit; Step 5: Classify and place the steel materials according to different installation locations and hang signs to indicate them; Step 6: Before applying anti-rust paint, the exposed parts of the steel must be derusted, oil stains must be wiped off with acetone, and the steel must be kept dry.

3. The outsourcing steel reinforcement construction process for old building renovation project according to claim 1 is characterized by: In step S2, the excavated earth is piled up nearby on site and backfilled on site after the construction is completed.

4. The outsourcing steel reinforcement construction process for old building renovation project according to claim 1 is characterized by: In step S4, the parts of the concrete surface that show deterioration phenomena such as peeling, hollowing, honeycombing, corrosion, etc. should be removed and repaired with designated materials. The cracked parts should be sealed first; small fillets should be ground at right angles and blown clean with compressed air.

5. The outsourcing steel reinforcement construction process for old building renovation project according to claim 1 is characterized by: In step S5, the steel plate should be polished from one end to the other end. The grain of the steel plate should be polished, and the polished grain should be perpendicular to the force-bearing surface of the pasted component. After polishing, wipe it clean with a dry cloth or acetone before pasting. The metallic luster should be exposed, and the surface treatment should not be stained with water, oil and dust.

6. The outsourcing steel reinforcement construction process for old building renovation project according to claim 1 is characterized by: In step S7, if glue injection pipes are buried, structural glue is injected from the glue injection pipes during glue injection until all the glue injection pipes are fully injected.

7. The outsourcing steel reinforcement construction process for old building renovation project according to claim 1 is characterized by: In step S8, if the pipe is not buried, a number of equidistant glue injection holes can be drilled on the surface of the steel material, the diameter of the glue injection holes is 5-8mm, and the spacing is not more than 500mm; when injecting glue, the vertical direction is in a bottom-up order, and the horizontal direction is in a same direction order. When injecting glue, wait until the next glue injection hole overflows glue, and inject glue in sequence until all the glue injection holes are injected; the last glue injection hole is used as an air outlet, and glue does not need to be injected. After the glue injection is completed, clean up the residual structural glue.

8. The outsourcing steel reinforcement construction process for old building renovation project according to claim 1 is characterized by: The structural adhesive in step S8 is a modified epoxy resin adhesive.

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