When the traditional silicon carbide flooring is used for cross-operation operations such as equipment installation, it will inevitably cause fouling and accelerate the deterioration of the silicon carbide flooring, resulting in defects such as erosion, peeling, and water retention. It is difficult to meet the requirements of the owners. .
1. Project Overview The owner requested that the production plant should control the floor according to the pollution of the clean room used for food production. Therefore, the core of the construction of this project is to solve the requirements of the clean room standard for the large area floor of the food factory.
2. Several kinds of corundum flooring surface construction technology selection 2.1 Secondary light harvesting process adopts secondary broadcast emery, disc machine compaction, smoothing, calendering hard knife before and after the initial coagulation to final condensation before closing + sealing Curing Agent and curing combination of construction methods. It has the advantages of non-hydrophilicity and smooth exterior. However, the construction operation is complicated and requires professional and technical personnel to cooperate. It requires skilled workers to operate and maintain and seal a large cost.
2.2 One-time cutting process uses one time to broadcast corundum, disc machine compaction, smoothing before and after the first coagulation of the calender hard knife to light before the final coagulation, and the construction of the shade and seal of the hard knife before and after the final coagulation of the calender. The method has the advantages of being non-hydrophilic and smooth and solid outside, but requires skilled workers to operate and new measures must be taken for the new seedlings to be planted once. It is difficult to maintain and seal the technology, and labor costs are high.
2.3 The secondary light-cutting process adopts secondary dissemination of emery, disc machine compaction, smoothing, hard calving knife before and after the initial coagulation before final coagulation light, calender hard knife before and after the final coagulation sealing and curing Combined construction methods. It also has the advantages of being non-hydrophilic and smooth and solid, but it is difficult and costly to maintain and seal.
After comparing and analyzing the different processes of the silicon carbide flooring, it can be seen that the secondary light collection process is expensive, difficult to construct, and unsuitable for large area construction. The secondary light-cutting diamond flooring has advantages in construction operations and prices. For this reason, we chose this solution as the best solution.
3. Specific construction strategy 3.1 Mixing ratio of high-grade water-reducing agent and fly ash is not used in order to make the loss of slump of solid surface structure of cemented diamond sand surface less than 2mm, so that the compressive strength and wear-resisting strength are in line with The design requirements, the use of high-performance water-reducing agent doped with fly ash doped with high-performance water-reducing agent to pour the floor structure entity, in order to improve the diamond surface floor drilling structural body compressive strength and wear resistance requirements.
3.1.1 Determine the focus of construction with high performance water reducer only. Through focused discussions, the three key construction control elements that have a significant impact on the quality of the floor structure are clarified: First, whether the concrete transportation time, together with the total time of pouring and technical intervals does not exceed the initial setting time of the concrete, is to ensure the floor The key to the vibration and compactness of structural concrete. The second is the concrete slump, which is of great significance for the paving and transportation of large-area floor concrete. The third is the final process of concrete pouring - vibrating, is the key to determine the formation of floor structure is good or bad.
3.1.2 Relevant engineering personnel inspected a large number of concrete transport time parameters for similar projects, combined with actual engineering, through field measurements, initially identified three concrete transport time parameters.
3.1.3 Through on-site pouring tests, it was found that one-hour transportation time can be selected with few concrete mixing stations, there is no quality advantage, and the two-hour transportation time is limited by the amount of concrete poured per day, which is not conducive to large-scale construction. With 1.5 hours of transport time, most of the quality mixing stations can be selected to form a stable concrete quality, and the 20 workers are most efficient. So choose 1.5 hours and 20 people parameters.
3.1.4 The concrete slump parameter is an important parameter that can meet the vibration compaction in the continuous transition range of the ultra-large area floor. The concrete slump parameter should be determined initially.
3.1.5 The concrete slump parameter is an important parameter that can satisfy the vibration compaction in the continuous transition range of the ultra-large area floor. The slump of the outlet is 10-12cm, and the gradient of the paving is about 30°. 2m, through the comprehensive analysis of the field test results, we used the second kind of plan parameters of the loading hopper slumps of 17 to 18cm, and then adopted measures for the insulation and cooling of the pumping pipe of the concrete.
After pouring according to the final selected concrete transport time parameters, the results showed that: Concrete transport time is 1.5 hours of pouring concrete, after all the paving and vibrating, the master has just footprints, reaching the initial setting.
3.2 Emery Floor Structure Solid steel reinforcement is installed for the gluten to be a multi-faceted diamond funnel-shaped slope with a standard settlement difference of ±1.5 以. Emery floor structure solid steel installation "reinforcement surface for multi-point diamond funnel-shaped looking slope-like."
3.2.1 In order to ensure that the protective layer is consistent, the size of the squat bench and the sculpted bar stool installed at each node must be verified.
3.2.2 Experienced calculation of φ16 round steel spot welding fixed gluten in the accurately measured plane elevation and coordinate position, a number of round steel horse stool accurately positioned gluten formed a funnel catchment range for the multi-sided diamond funnel Shaped, marked on a round steel bench.
3.2.3 The operator can accurately install the guide rail in a predetermined position.
3.2.4 When the rails are installed, the results will be officially used after the calibration correction and reinforcement, and the dynamic measurement and inspection will be used during the use to ensure that the accuracy of the rails meets the requirements.
3.3 Satisfaction of slope requirements and large-area construction after control of flatness for smooth and solid floor surface; multi-faceted funnel-shaped slope for slope drilling 0.5%; floor level control within 2m by ±2 ,, Ping Ping uses multi-faceted diamond-shaped funnels to find slopes to meet slope requirements and control large areas after flatness control.
3.3.1 In order to ensure that the quality of oversized corundum flooring construction is stable, a multi-faceted diamond-shaped funnel-shaped construction method shall be adopted for the slope of the production plant to ensure that the slope of the floor surface is correct and that the plane elevation control rails can be installed linearly. And develop a process to guide the on-site operation.
3.3.2 In the area of ​​large-area diamond floor drains, use the cad software computer to draw the plane projection position of the multi-faceted diamond-shaped funnel-shaped intersection polyline. Preliminarily assign the slope elevation to each node, and then use the total station to measure the surface of the pad. The actual position line is set to reduce the loss of slope direction in the operation of multiple calenders on an oversized area.
Guide rail installation diagram 3.3.3 In the ground drain center radius of 250mm within the scope of the funnel tip, using a wooden box made into a box surrounded by pouring, the outer edge of the floor drain 20mm lower than the edge of the box, and do a good job blocking hole protection.
3.3.4 To ensure the formation of a multi-faceted diamond-shaped funnel, a Ñ„16 round steel horse stool is placed under the gluten node of the floor structure, and 35mm below the elevation of the node is the top surface of the gluten to ensure uniform protection.
3.3.5 According to the nodal installation guide rails, the surveyor uses the laser scanner to dynamically measure the guide rail control elevation, and then evenly casts the structural concrete. After the concrete of the bedding layer is slightly filled with water, when the initial setting strength is reached, the screeding machine starts slowly grinding. Oh, squeezing. Then use a ruler bar to level the surface of the concrete slurry.
3.3.6 When the concrete of the grass-roots level is initially set to 50% dry, the first time the material is sprinkled. First sprinkle the required amount of 2/3, and after the water surface of the concrete becomes darker after the diamond has absorbed water, use a disc grinder to compact the bristles. After a period of time, spread the remaining 1/3 of the diamond to the surface and spread the direction. Vertically in the direction of the first spreading, immediately after spreading, smooth, light, and repeat the calender operation at least twice. The operation of the calenders should be staggered vertically and horizontally to prevent material from gathering. The corners were manually treated with wood and iron trowel. Ensure that the allowable deviation of floor surface roughness is within 2 å…许 per 2m. Effectiveness check: Through the above measures, the slope of the multi-faceted diamond-shaped funnel-shaped slope on the ground surface is ensured, and a 35mm thick protective layer is reserved on the top surface of the gluten floor structure, so that the corundum surface layer and the structure are more firmly bonded and measured. The laser leveler is used to dynamically measure the guide rail elevation, which effectively ensures the formation of multi-faceted diamonds.
4, construction summary
4.1 The professional and technical aspects have a comprehensive understanding of the construction of the corundum floor and the equipment installation and second decoration on the floor, and the technical level has also been greatly improved, mainly in:
4.1.1 Mastered the construction process and control points of carborundum floor Through this implementation, in order to prevent the combination of carborundum surface and structure and thus affect the construction quality of carborundum floor in the construction of similar projects in the future, attention should be paid to the protection of steel bars on the floor structure. Layer thickness should not exceed 35mm. The reinforced gluten of the corundum floor structure is a multi-surface diamond-shaped funnel-shaped slope, which is conducive to uniform and uniform protection layer and can ensure that the deviation of the protective layer is controlled within the allowable range of the specification.
Multi-faceted Diamond Funnel Slope Slope Schematic
4.1.2 Innovative points in the construction process of drilling diamond emery floors (1) Construction in separate warehouses. Super large-area poured concrete is prone to cold joints. In the implementation of this activity, a 12-meter-wide sub-position was applied to the construction plan layout. Through the actual construction inspection, the effect is in line with quality requirements.
(2) Reasonably arrange the concrete pouring sequence: (one-way pouring, each width is 4 to 6 meters). Provides a scientific process for the construction of concrete pouring in sub-warehouses, ensuring construction progress and construction quality.
(3) Install temporary rails. It has provided strong support for the leveling of the corundum surface to ensure that the slope of the surface is correct and the surface roughness conforms to the design requirements.
4.2 Management Technology Members of the team were able to conduct QC activities in accordance with the PDCA procedures, and were able to speak with objective data and use QC tools correctly, which solved construction quality problems well.
5. Conclusion The construction of the construction project is complex and changeable, which requires the construction personnel to continuously explore, improve, innovate and reinforce. In the construction process, the construction personnel should be responsible for serious and contrast a variety of construction programs to select the best strategy to save costs and ensure project quality. Build a high-quality, high-level project that will bring economic benefits to the company while repaying society and serving the community.
1. Project Overview The owner requested that the production plant should control the floor according to the pollution of the clean room used for food production. Therefore, the core of the construction of this project is to solve the requirements of the clean room standard for the large area floor of the food factory.
2. Several kinds of corundum flooring surface construction technology selection 2.1 Secondary light harvesting process adopts secondary broadcast emery, disc machine compaction, smoothing, calendering hard knife before and after the initial coagulation to final condensation before closing + sealing Curing Agent and curing combination of construction methods. It has the advantages of non-hydrophilicity and smooth exterior. However, the construction operation is complicated and requires professional and technical personnel to cooperate. It requires skilled workers to operate and maintain and seal a large cost.
2.2 One-time cutting process uses one time to broadcast corundum, disc machine compaction, smoothing before and after the first coagulation of the calender hard knife to light before the final coagulation, and the construction of the shade and seal of the hard knife before and after the final coagulation of the calender. The method has the advantages of being non-hydrophilic and smooth and solid outside, but requires skilled workers to operate and new measures must be taken for the new seedlings to be planted once. It is difficult to maintain and seal the technology, and labor costs are high.
2.3 The secondary light-cutting process adopts secondary dissemination of emery, disc machine compaction, smoothing, hard calving knife before and after the initial coagulation before final coagulation light, calender hard knife before and after the final coagulation sealing and curing Combined construction methods. It also has the advantages of being non-hydrophilic and smooth and solid, but it is difficult and costly to maintain and seal.
After comparing and analyzing the different processes of the silicon carbide flooring, it can be seen that the secondary light collection process is expensive, difficult to construct, and unsuitable for large area construction. The secondary light-cutting diamond flooring has advantages in construction operations and prices. For this reason, we chose this solution as the best solution.
3. Specific construction strategy 3.1 Mixing ratio of high-grade water-reducing agent and fly ash is not used in order to make the loss of slump of solid surface structure of cemented diamond sand surface less than 2mm, so that the compressive strength and wear-resisting strength are in line with The design requirements, the use of high-performance water-reducing agent doped with fly ash doped with high-performance water-reducing agent to pour the floor structure entity, in order to improve the diamond surface floor drilling structural body compressive strength and wear resistance requirements.
3.1.1 Determine the focus of construction with high performance water reducer only. Through focused discussions, the three key construction control elements that have a significant impact on the quality of the floor structure are clarified: First, whether the concrete transportation time, together with the total time of pouring and technical intervals does not exceed the initial setting time of the concrete, is to ensure the floor The key to the vibration and compactness of structural concrete. The second is the concrete slump, which is of great significance for the paving and transportation of large-area floor concrete. The third is the final process of concrete pouring - vibrating, is the key to determine the formation of floor structure is good or bad.
3.1.2 Relevant engineering personnel inspected a large number of concrete transport time parameters for similar projects, combined with actual engineering, through field measurements, initially identified three concrete transport time parameters.
3.1.3 Through on-site pouring tests, it was found that one-hour transportation time can be selected with few concrete mixing stations, there is no quality advantage, and the two-hour transportation time is limited by the amount of concrete poured per day, which is not conducive to large-scale construction. With 1.5 hours of transport time, most of the quality mixing stations can be selected to form a stable concrete quality, and the 20 workers are most efficient. So choose 1.5 hours and 20 people parameters.
3.1.4 The concrete slump parameter is an important parameter that can meet the vibration compaction in the continuous transition range of the ultra-large area floor. The concrete slump parameter should be determined initially.
3.1.5 The concrete slump parameter is an important parameter that can satisfy the vibration compaction in the continuous transition range of the ultra-large area floor. The slump of the outlet is 10-12cm, and the gradient of the paving is about 30°. 2m, through the comprehensive analysis of the field test results, we used the second kind of plan parameters of the loading hopper slumps of 17 to 18cm, and then adopted measures for the insulation and cooling of the pumping pipe of the concrete.
After pouring according to the final selected concrete transport time parameters, the results showed that: Concrete transport time is 1.5 hours of pouring concrete, after all the paving and vibrating, the master has just footprints, reaching the initial setting.
3.2 Emery Floor Structure Solid steel reinforcement is installed for the gluten to be a multi-faceted diamond funnel-shaped slope with a standard settlement difference of ±1.5 以. Emery floor structure solid steel installation "reinforcement surface for multi-point diamond funnel-shaped looking slope-like."
3.2.1 In order to ensure that the protective layer is consistent, the size of the squat bench and the sculpted bar stool installed at each node must be verified.
3.2.2 Experienced calculation of φ16 round steel spot welding fixed gluten in the accurately measured plane elevation and coordinate position, a number of round steel horse stool accurately positioned gluten formed a funnel catchment range for the multi-sided diamond funnel Shaped, marked on a round steel bench.
3.2.3 The operator can accurately install the guide rail in a predetermined position.
3.2.4 When the rails are installed, the results will be officially used after the calibration correction and reinforcement, and the dynamic measurement and inspection will be used during the use to ensure that the accuracy of the rails meets the requirements.
3.3 Satisfaction of slope requirements and large-area construction after control of flatness for smooth and solid floor surface; multi-faceted funnel-shaped slope for slope drilling 0.5%; floor level control within 2m by ±2 ,, Ping Ping uses multi-faceted diamond-shaped funnels to find slopes to meet slope requirements and control large areas after flatness control.
3.3.1 In order to ensure that the quality of oversized corundum flooring construction is stable, a multi-faceted diamond-shaped funnel-shaped construction method shall be adopted for the slope of the production plant to ensure that the slope of the floor surface is correct and that the plane elevation control rails can be installed linearly. And develop a process to guide the on-site operation.
3.3.2 In the area of ​​large-area diamond floor drains, use the cad software computer to draw the plane projection position of the multi-faceted diamond-shaped funnel-shaped intersection polyline. Preliminarily assign the slope elevation to each node, and then use the total station to measure the surface of the pad. The actual position line is set to reduce the loss of slope direction in the operation of multiple calenders on an oversized area.
Guide rail installation diagram 3.3.3 In the ground drain center radius of 250mm within the scope of the funnel tip, using a wooden box made into a box surrounded by pouring, the outer edge of the floor drain 20mm lower than the edge of the box, and do a good job blocking hole protection.
3.3.4 To ensure the formation of a multi-faceted diamond-shaped funnel, a Ñ„16 round steel horse stool is placed under the gluten node of the floor structure, and 35mm below the elevation of the node is the top surface of the gluten to ensure uniform protection.
3.3.5 According to the nodal installation guide rails, the surveyor uses the laser scanner to dynamically measure the guide rail control elevation, and then evenly casts the structural concrete. After the concrete of the bedding layer is slightly filled with water, when the initial setting strength is reached, the screeding machine starts slowly grinding. Oh, squeezing. Then use a ruler bar to level the surface of the concrete slurry.
3.3.6 When the concrete of the grass-roots level is initially set to 50% dry, the first time the material is sprinkled. First sprinkle the required amount of 2/3, and after the water surface of the concrete becomes darker after the diamond has absorbed water, use a disc grinder to compact the bristles. After a period of time, spread the remaining 1/3 of the diamond to the surface and spread the direction. Vertically in the direction of the first spreading, immediately after spreading, smooth, light, and repeat the calender operation at least twice. The operation of the calenders should be staggered vertically and horizontally to prevent material from gathering. The corners were manually treated with wood and iron trowel. Ensure that the allowable deviation of floor surface roughness is within 2 å…许 per 2m. Effectiveness check: Through the above measures, the slope of the multi-faceted diamond-shaped funnel-shaped slope on the ground surface is ensured, and a 35mm thick protective layer is reserved on the top surface of the gluten floor structure, so that the corundum surface layer and the structure are more firmly bonded and measured. The laser leveler is used to dynamically measure the guide rail elevation, which effectively ensures the formation of multi-faceted diamonds.
4, construction summary
4.1 The professional and technical aspects have a comprehensive understanding of the construction of the corundum floor and the equipment installation and second decoration on the floor, and the technical level has also been greatly improved, mainly in:
4.1.1 Mastered the construction process and control points of carborundum floor Through this implementation, in order to prevent the combination of carborundum surface and structure and thus affect the construction quality of carborundum floor in the construction of similar projects in the future, attention should be paid to the protection of steel bars on the floor structure. Layer thickness should not exceed 35mm. The reinforced gluten of the corundum floor structure is a multi-surface diamond-shaped funnel-shaped slope, which is conducive to uniform and uniform protection layer and can ensure that the deviation of the protective layer is controlled within the allowable range of the specification.
Multi-faceted Diamond Funnel Slope Slope Schematic
4.1.2 Innovative points in the construction process of drilling diamond emery floors (1) Construction in separate warehouses. Super large-area poured concrete is prone to cold joints. In the implementation of this activity, a 12-meter-wide sub-position was applied to the construction plan layout. Through the actual construction inspection, the effect is in line with quality requirements.
(2) Reasonably arrange the concrete pouring sequence: (one-way pouring, each width is 4 to 6 meters). Provides a scientific process for the construction of concrete pouring in sub-warehouses, ensuring construction progress and construction quality.
(3) Install temporary rails. It has provided strong support for the leveling of the corundum surface to ensure that the slope of the surface is correct and the surface roughness conforms to the design requirements.
4.2 Management Technology Members of the team were able to conduct QC activities in accordance with the PDCA procedures, and were able to speak with objective data and use QC tools correctly, which solved construction quality problems well.
5. Conclusion The construction of the construction project is complex and changeable, which requires the construction personnel to continuously explore, improve, innovate and reinforce. In the construction process, the construction personnel should be responsible for serious and contrast a variety of construction programs to select the best strategy to save costs and ensure project quality. Build a high-quality, high-level project that will bring economic benefits to the company while repaying society and serving the community.
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