Local cast-in-place construction method for triangular inclined leg support of prefabricated coupling beam

Abstract

The invention discloses a local cast-in-place construction method for a triangular inclined leg support of a prefabricated coupling beam. The local cast-in-place construction method comprises the steps that the prefabricated coupling beam is manufactured, parameters such as steel bars and holes are controlled, a rough surface is arranged, and a sensor is pre-embedded; manufacturing and mounting a triangular inclined leg support, determining an angle, performing reinforcement treatment, controlling mounting precision, performing corrosion prevention and arranging a damping device; field positioning and adjustment are conducted, accurate butt joint is conducted, temporary supports are arranged, and the BIM technology is adopted; local cast-in-place connection is conducted, concrete parameters are controlled, reinforcing steel bars are treated, and additives are added; maintenance and quality detection, temperature and humidity control, nondestructive detection and construction of a quality tracing system. The invention further comprises a corresponding building structure. Structural performance and safety are improved, connection reliability and shock resistance are enhanced, component strength and stability are improved, construction quality and efficiency are guaranteed, precision is ensured, the period is shortened, quality control and management are optimized, and real-time monitoring and traceable analysis are achieved. Cost is reduced, environmental protection and energy saving are achieved, and wide application value is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a local cast-in-place construction method for prefabricated coupling beam triangular oblique leg supports. Background Art

[0002] With the continuous development and progress of the construction industry, the safety, stability and construction efficiency of building structures have become the focus of attention. Among the many building structure forms, prefabricated structures have gradually been widely used due to their advantages such as fast construction speed, controllable quality and low impact on the environment. However, in the construction process of prefabricated structures, how to ensure the firm and reliable connection between the prefabricated components and to achieve coordinated work with the overall structure at the local connection parts has always been one of the challenges faced by engineering and technical personnel.

[0003] As an important load-bearing component in the building structure, the connection method between the prefabricated coupling beam and other structural components has a key impact on the performance of the entire structure. The traditional connection method of prefabricated coupling beams may have some shortcomings, such as the reliability of the connection, the convenience of construction, and the integrity of the structure. In some existing connection methods, there may be problems such as insufficient strength of the connection part, difficulty in ensuring construction accuracy, and a large amount of wet work on site. These problems will not only affect the construction progress and quality, but may also bring potential risks to the long-term performance and safety of the building structure.

[0004] At the same time, as the height and complexity of buildings continue to increase, building structures need to withstand various loads and external forces during use, such as earthquakes and wind loads. Therefore, the requirements for the seismic performance and stability of the connection parts are becoming increasingly higher. When dealing with these complex stress conditions, traditional connection methods may not be able to meet the safety requirements of the structure, and are prone to problems such as damage to the connection parts and excessive structural deformation.

[0005] In addition, quality control and management in the construction process is also an important aspect. How to ensure that each construction process meets the design requirements and standard specifications, and to be able to effectively trace and analyze when quality problems occur, is the key to improving the quality and reliability of buildings. At present, some construction methods may have certain limitations in quality control, lack of effective monitoring means and quality traceability system, and it is difficult to ensure the stability and consistency of construction quality.

[0006] In summary, in order to solve the problems existing in the existing prefabricated coupling beam connection construction method and improve the safety, stability and construction efficiency of the building structure, the development of an innovative prefabricated coupling beam triangular inclined leg support local cast-in-place construction method has important practical significance and application value. This new construction method aims to achieve reliable connection of the connection parts and improve the overall performance of the structure by optimizing the manufacturing and installation process of prefabricated coupling beams and triangular inclined leg supports, strengthening the precision control and quality assurance measures of on-site construction, and using advanced technical means, so as to meet the needs of modern building structures for high-quality and high-performance construction. Summary of the invention

[0007] The present invention provides a local cast-in-place construction method for prefabricated coupling beam triangular oblique leg supports to solve the problems mentioned in the above-mentioned prior art.

[0008] In order to achieve the above object, the present invention adopts the following technical solution: a local cast-in-place construction method of a prefabricated coupling beam triangular inclined leg support, comprising the following steps:

[0009] Prefabricated coupling beam production steps:

[0010] According to the design requirements, high-strength concrete and steel bars are used in the prefabrication factory to make prefabricated coupling beams. High-performance steel bars are configured in the coupling beams, and the yield strength of the steel bars is not less than 400MPa to ensure the strength and toughness of the coupling beams. Steel bar holes connected to the triangular inclined leg supports and connection parts for later cast-in-place are reserved in the coupling beams. The diameter error of the holes is controlled within ±2mm, and the inner wall of the holes is smoothed to facilitate the connection and insertion of the steel bars. At the same time, a rough surface is set on the surface of the prefabricated coupling beam, and a specific roughening process is used to make the average roughness of the rough surface reach more than 6μm to enhance the bonding force with the cast-in-place concrete.

[0011] Triangular slanted leg support production and installation steps:

[0012] The triangular slanted leg support is made of high-strength steel, and the angle of the slanted leg is about 45° (can be fine-tuned between 40°-50°). The optimal angle value is determined based on the stress analysis and simulation calculation of the building structure to ensure that it has sufficient bearing capacity and stability. The wall thickness of the slanted leg support steel is not less than 10mm, and key parts are strengthened, such as welded stiffening ribs.

[0013] The prepared triangular slanted leg support is installed at the predetermined position through embedded parts or bolted connection, and is reliably connected to the main body of the building structure. The position accuracy error of the embedded parts is controlled within ±3mm, and the tightening force of the bolts reaches the specified torque value. After the installation is completed, it is inspected and accepted to ensure that the installation accuracy error is controlled within ±5mm. At the same time, the surface of the triangular slanted leg support is treated with anti-corrosion, using advanced anti-corrosion paint or galvanizing technology, and the coating thickness is not less than 80μm to improve its durability.

[0014] On-site positioning and adjustment steps:

[0015] The prefabricated connecting beam is transported to the construction site and installed by lifting equipment. During the lifting process, a special lifting device is used to ensure the balance and safety of the prefabricated connecting beam. High-precision measuring instruments such as total stations are used for precise on-site positioning, so that the connection between the prefabricated connecting beam and the triangular inclined leg support is accurately docked, and the adjustment deviation is within ±3mm. During the installation of the prefabricated connecting beam, a temporary support is set up. The temporary support adopts an adjustable steel structure support, and its bearing capacity is not less than 1.5 times the dead weight of the prefabricated connecting beam to ensure stability during the installation process. The temporary support is removed after the cast-in-place concrete reaches 75% of the design strength.

[0016] Partial cast-in-place connection steps:

[0017] Partial casting is performed at the connection between the precast coupling beam and the triangular oblique leg support and at the gap between the precast coupling beams. Micro-expansive concrete is used, and its expansion rate is controlled between 0.02% and 0.04% to ensure that the gaps can be fully filled during the concrete hardening process and reduce the occurrence of shrinkage cracks. The density of the concrete is ensured during pouring, and a high-frequency vibrator is used for vibration. The vibration time is controlled between 30-60s, and there is no honeycomb surface phenomenon. The strength grade of the cast-in-place part is not lower than the strength grade of the precast coupling beam, and an appropriate amount of high-performance admixtures such as water reducers and impermeability agents are added to the concrete to improve the performance of the concrete.

[0018] Maintenance and quality inspection steps:

[0019] The cast-in-place parts shall be maintained for no less than 10 days, and the maintenance measures shall be appropriately adjusted according to the ambient temperature and humidity. The maintenance method of covering and moisturizing shall be adopted, and the maintenance materials shall be geotextiles or plastic films with good water absorption. During the maintenance process, the temperature and humidity shall be monitored in real time and the data shall be recorded. When the temperature is lower than 5°C or the humidity is greater than 85%, insulation or dehumidification measures shall be taken, such as using heating equipment to increase the temperature or ventilation equipment to reduce the humidity.

[0020] After the maintenance is completed, non-destructive testing methods are used to inspect the quality of the connection parts to ensure that the connection strength meets the design requirements. For example, ultrasonic testing is used to detect internal defects in concrete, with a detection frequency of 5MHz-10MHz and a detection accuracy of less than 2mm; tensile strength testing is used, with no less than 3 groups of test samples, and the average value of the test results is not less than 95% of the design strength.

[0021] Furthermore, in the step of manufacturing the prefabricated coupling beam, an intelligent sensor is embedded in the prefabricated coupling beam to monitor the stress, strain, temperature and other parameters of the coupling beam in real time, and the accuracy error of the sensor does not exceed ±1%.

[0022] Furthermore, in the steps of manufacturing and installing the triangular oblique leg support, a shock absorbing device, such as a rubber pad or a shock absorbing spring, is provided at the connection portion between the triangular oblique leg support and the main body of the building structure to reduce the impact of external forces such as earthquakes on the structure, and the shock absorbing coefficient of the shock absorbing device is not less than 0.2.

[0023] Furthermore, in the on-site positioning and adjustment steps, BIM technology is used to perform construction simulation and collision detection to discover and solve problems that may arise during the construction process in advance, thereby improving construction efficiency and quality.

[0024] Furthermore, in the local cast-in-place connection step, before pouring concrete, the steel bars at the connection parts are derusted and cleaned, and mechanical or chemical rust removal methods are used to ensure that the rust level of the steel bar surface reaches Sa2.5 or above, and a special cleaning agent is used to clean the steel bar surface to ensure good bonding between the steel bar and the concrete.

[0025] Furthermore, in the maintenance and quality inspection steps, a quality traceability system is established to record and number each process and material used in the construction process so that they can be traced and analyzed when quality problems arise.

[0026] Furthermore, the present invention discloses a building structure, which is constructed by adopting the above-mentioned prefabricated connecting beam triangular inclined leg support local cast-in-place construction method.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention controls the diameter error of the reserved steel bar holes in the prefabricated connecting beam within ±2mm by precisely controlling the connection process between the prefabricated connecting beam and the triangular oblique leg support, and uses micro-expansive concrete for local casting, with the expansion rate controlled between 0.02% and 0.04%, which effectively enhances the reliability of the connection, reduces the generation of shrinkage cracks, and makes the connection parts tighter and firmer. At the same time, a shock-absorbing device is set at the connection part between the triangular oblique leg support and the main body of the building structure, and the shock-absorbing coefficient is not less than 0.2, which greatly improves the seismic performance and overall safety of the building structure.

[0029] The present invention significantly improves the strength and bearing capacity of the component by configuring high-performance steel bars with a yield strength of not less than 400MPa in the prefabricated connecting beam, using high-strength steel to make triangular oblique leg supports and strengthening key parts, such as welding stiffening ribs, etc. During the construction process, the position accuracy error of the embedded parts is strictly controlled within ±3mm, and the overall installation accuracy error is controlled within ±5mm, making the building structure system more stable, effectively enhancing the stability of the structure, reducing the risk of structural deformation and damage, and extending the service life of the building.

[0030] The present invention uses high-precision measuring instruments such as total stations for on-site positioning, controls the adjustment deviation of the connection between the prefabricated connecting beam and the triangular oblique leg support within ±3mm, and sets an adjustable temporary support with a bearing capacity not less than 1.5 times its own weight during the installation of the prefabricated connecting beam. It is removed after the cast-in-place concrete reaches 75% of the design strength, effectively ensuring the construction accuracy and stability, reducing quality problems caused by construction errors, reducing the rework rate, and ensuring the construction quality. At the same time, the prefabricated connecting beam can be prefabricated in the factory in parallel with other on-site processes, and the local on-site cast-in-place process is reasonable and uses efficient equipment, such as controlling the vibration time between 30-60s, and combining BIM technology for construction simulation and collision detection, solving problems and optimizing processes in advance, greatly improving construction efficiency, and accelerating project progress.

[0031] The present invention embeds intelligent sensors in prefabricated connecting beams with an accuracy error of no more than ±1%, thus achieving real-time monitoring of parameters such as stress, strain and temperature of the connecting beams. During the maintenance process, the temperature and humidity are monitored in real time and measures are taken in case of abnormalities, effectively ensuring that the construction quality is under control. A quality traceability system is established to record construction procedures and material information, facilitate problem tracing and analysis, promote the standardization of construction, and provide reliable guarantee for building quality.

[0032] To sum up, the present invention has excellent performance in structural performance, construction quality and efficiency, quality control, etc., reduces costs, has environmental protection and energy-saving benefits, and provides an advanced and reliable construction solution for the construction industry, which has broad application value and promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the local cast-in-place construction method of the prefabricated coupling beam triangular inclined leg support proposed by 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] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] Reference Figure 1 :A local cast-in-place construction method for prefabricated connecting beam triangular inclined leg support, comprising the following steps

[0038] Prefabricated coupling beam production steps

[0039] Materials match design requirements

[0040] According to the detailed architectural design requirements, the prefabricated coupling beams are manufactured in professional prefabrication factories. High-strength concrete is selected, and its various performance indicators must meet the strict requirements of the building structure in terms of strength and durability. The steel bars are high-performance steel bars with a yield strength of not less than 400MPa. This type of steel bar has excellent strength and toughness, and can provide reliable mechanical performance guarantee for the prefabricated coupling beams, ensuring that the coupling beams have sufficient strength and deformation capacity when subjected to various loads.

[0041] Precisely reserve holes and connection parts

[0042] During the production of the coupling beam, the steel bar holes connected to the triangular inclined leg support are accurately reserved. The diameter error of the hole is controlled within a very small ±2mm, which requires high-precision molds and processing technology to ensure. The inner wall of the hole is smoothed, such as by using a special grinding process or applying lubricants, so that the subsequent connection and insertion of steel bars are smoother, reducing resistance and friction during construction, and improving the efficiency and quality of the connection. At the same time, the connection parts for later cast-in-place are reserved to ensure seamless connection with on-site construction.

[0043] Rough surface treatment

[0044] In order to enhance the bonding force between the precast coupling beam and the cast-in-place concrete, a rough surface is set on the surface of the coupling beam. A specific roughening process is adopted, such as using a special roughening tool or mechanical device, so that the average roughness of the rough surface reaches more than 6μm. This rough surface can increase the contact area and friction between the concrete and the coupling beam surface, so that during the cast-in-place process, the new and old concrete can be better combined to form a whole, thereby improving the strength and integrity of the connection part.

[0045] Intelligent sensor pre-embedded

[0046] Furthermore, intelligent sensors are embedded in the prefabricated coupling beams. These sensors can monitor key parameters such as stress, strain and temperature of the coupling beams in real time during the construction process and subsequent use. The accuracy error of the sensors does not exceed ±1%, ensuring that the collected data is accurate and reliable. Through real-time monitoring of these parameters, the working status of the coupling beams can be understood in a timely manner, providing strong data support for quality control during the construction process and subsequent structural safety assessments. For example, when it is monitored that the stress or strain exceeds a certain threshold, the construction process can be adjusted in time or reinforcement measures can be taken to prevent the occurrence of structural safety accidents.

[0047] Triangular slanted leg support production and installation steps

[0048] Material and structural design

[0049] High-strength steel is used as the material for the triangular slanted leg support. This type of steel has high strength and rigidity and can withstand large loads. The angle of the slanted leg is designed to be around 45°, and can be fine-tuned between 40° and 50° based on the specific force analysis and simulation calculation of the building structure to ensure that it has the best bearing capacity and stability. During the design process, considering the stress conditions of the building structure under different load conditions, the size, shape and connection method of the slanted leg are optimized through tools such as structural mechanics analysis software, so that it can effectively transfer the load to the main body of the building structure.

[0050] Strengthen processing and production technology

[0051] The wall thickness of the steel section supported by the inclined leg shall not be less than 10mm to ensure its own strength and stability. Strengthening treatment is carried out at key locations, such as welding stiffening ribs. The welding of stiffening ribs adopts advanced welding technology to ensure welding quality and improve the strength and reliability of the connection. During the production process, the steel section is subjected to precise cutting, drilling, welding and other processing operations to ensure the dimensional accuracy and connection accuracy of each component. For example, CNC cutting equipment is used to cut the steel section to ensure the flatness and dimensional accuracy of the cutting surface; high-precision drilling equipment is used to process holes to ensure the accuracy of bolt connections.

[0052] Installation and connection process

[0053] The prepared triangular oblique leg support is installed at the predetermined position through embedded parts or bolted connection, and is reliably connected to the main body of the building structure. The installation position accuracy error of the embedded parts is controlled within ±3mm, which requires accurate positioning and embedding during the construction of the main body of the building structure. When bolting, ensure that the tightening force of the bolts reaches the specified torque value, use a professional torque wrench for tightening, and conduct strict quality inspection. After the installation is completed, a comprehensive acceptance is carried out, and the installation accuracy is reviewed by measuring instruments to ensure that the overall installation accuracy error is controlled within ±5mm. At the same time, the surface of the triangular oblique leg support is treated with anti-corrosion, and advanced anti-corrosion coatings or galvanizing processes are used, and the coating thickness is not less than 80μm. The selection of anti-corrosion coatings should be based on the use environment and durability requirements. For example, in a humid or highly corrosive environment, a coating with good corrosion resistance should be selected. The galvanizing process can form a dense zinc layer on the surface of the steel section, which effectively prevents the steel from rusting and improves its durability.

[0054] Shock absorber settings

[0055] Shock-absorbing devices, such as rubber pads or shock-absorbing springs, are installed at the connection between the triangular oblique leg support and the main body of the building structure. These shock-absorbing devices can absorb and buffer part of the energy when external forces such as earthquakes act, reducing the impact of earthquakes on the building structure. The shock absorption coefficient of the shock-absorbing device is not less than 0.2. Through reasonable design and selection, it can effectively play a shock-absorbing role. For example, the material and thickness of the rubber pad should be selected according to factors such as the weight of the building structure and the seismic force, to ensure that it can produce appropriate deformation when an earthquake occurs, absorb seismic energy, and maintain the stability of the structure.

[0056] On-site positioning and adjustment steps

[0057] Lifting and safety assurance

[0058] After the prefabricated coupling beam is transported to the construction site, it is hoisted and installed using professional lifting equipment. During the hoisting process, special hoists are used, such as customized steel beam hoists or rope hoists, to ensure the balance and safety of the prefabricated coupling beam. The design of the hoist should take into account factors such as the weight, shape and size of the coupling beam to ensure that the coupling beam will not shake, tilt or fall off during the hoisting process. At the same time, the lifting equipment should be regularly inspected and maintained to ensure its good performance. The operator should have the corresponding qualifications and skills and strictly abide by the operating procedures to ensure the safety and reliability of the hoisting process.

[0059] Application of high-precision positioning technology

[0060] Use high-precision measuring instruments such as total stations for precise on-site positioning. Total stations have the advantages of high measurement accuracy, fast speed, and easy operation. They can accurately measure the coordinates and positions of the connection parts between the prefabricated connecting beams and the triangular inclined leg supports. By establishing a measurement control network at the construction site, the design coordinates are compared with the actual measurement coordinates, and the position of the prefabricated connecting beams is accurately adjusted so that the connection parts are accurately docked, and the adjustment deviation is within ±3mm. In the positioning process, factors such as the terrain and building obstructions at the construction site should be taken into consideration, and appropriate measurement points and measurement methods should be selected to ensure the accuracy of the measurement data.

[0061] Temporary support installation and removal

[0062] Temporary supports are set up during the installation of prefabricated coupling beams, and the temporary supports adopt adjustable steel structure supports. This kind of support has a high bearing capacity, not less than 1.5 times the deadweight of the prefabricated coupling beam, and can effectively support the weight and construction load of the prefabricated coupling beam during the installation process. The height and angle of the temporary support can be adjusted according to the actual situation to ensure the correct installation position and posture of the prefabricated coupling beam. After the cast-in-place concrete reaches 75% of the design strength, the temporary support is removed. The removal process should follow a certain order and method, first remove the secondary support, and then remove the main support to ensure the stability of the structure. At the same time, the structure is monitored in real time during the removal process. If any abnormal situation is found, the removal should be stopped immediately and corresponding measures should be taken to deal with it.

[0063] Advantages of BIM technology application

[0064] Use BIM (Building Information Modeling) technology for construction simulation and collision detection. Before construction, import the three-dimensional model of the building structure into the BIM software to simulate the installation of prefabricated connecting beams, the connection of triangular diagonal leg supports, and other construction processes. Through simulation, problems that may arise during the construction process, such as collisions between components and insufficient construction space, can be discovered in advance and optimized and adjusted. For example, when it is found in the BIM model that the prefabricated connecting beam collides with other pipes or structural components, the design or construction plan can be adjusted in advance to avoid problems in actual construction, thereby improving construction efficiency and quality and reducing construction changes and rework.

[0065] Partial cast-in-place connection steps

[0066] Concrete materials and mix design

[0067] Partial casting is carried out at the connection between the precast coupling beam and the triangular inclined leg support and the gap between the precast coupling beams. Micro-expansive concrete is used, and its expansion rate is controlled between 0.02% and 0.04%. This micro-expansive concrete can produce moderate expansion during the hardening process, thereby fully filling the gap and reducing the occurrence of shrinkage cracks. When designing the concrete mix ratio, the amount and proportion of cement, aggregate, admixture and other materials should be reasonably determined according to the project requirements and the actual situation on site. For example, choose the appropriate cement variety and strength grade, control the amount of cement to avoid excessive shrinkage of concrete; choose well-graded aggregates to improve the density and strength of concrete; add an appropriate amount of high-performance admixtures, such as water reducers and impermeability agents, to improve the working performance and durability of concrete.

[0068] Steel bar processing and concrete pouring technology

[0069] Before pouring concrete, the steel bars at the connection parts should be derusted and cleaned. Use mechanical or chemical rust removal methods to ensure that the rust removal level of the steel bar surface reaches Sa2.5 or above. Mechanical rust removal can be carried out using electric wire brushes, sandblasting equipment, etc., while chemical rust removal can use special rust removers. After rust removal, use a special cleaner to clean the surface of the steel bar to remove impurities such as oil and rust to ensure good bonding between the steel bar and the concrete. When pouring concrete, use a high-frequency vibrator for vibration, and the vibration time should be controlled between 30-60s. The vibration process should be uniform and dense to avoid over-vibration or missed vibration. The vibrating rod should be inserted into the lower layer of concrete to a certain depth to ensure that the upper and lower layers of concrete are well combined and there is no honeycomb surface phenomenon. At the same time, during the pouring process, attention should be paid to controlling the pouring speed and height of the concrete to prevent concrete segregation or overflow.

[0070] Strength and performance guarantee of cast-in-place parts

[0071] The strength grade of the cast-in-place part shall not be lower than that of the prefabricated coupling beam to ensure the strength and integrity of the connection. Through strict raw material quality control, mix design and construction process management, the quality of cast-in-place concrete is ensured to meet the design requirements. Adding an appropriate amount of high-performance admixtures to concrete, such as water reducers, can reduce the water consumption of concrete and improve the fluidity and density of concrete; anti-seepage agents can improve the anti-seepage performance of concrete and prevent water penetration from causing steel corrosion and concrete damage. During the construction process, the slump and strength of concrete are tested in real time, and the construction process and mix ratio are adjusted in time to ensure that the performance of concrete meets the requirements.

[0072] Maintenance and quality inspection steps

[0073] Maintenance measures and environmental control

[0074] The cast-in-place parts shall be cured for no less than 10 days. The method of covering and moisturizing curing shall be adopted, and the curing materials shall be geotextiles or plastic films with good water absorption. The geotextiles shall have sufficient thickness and water absorption to effectively maintain the humidity of the concrete surface. The plastic film shall have good sealing properties to prevent water evaporation. During the curing process, the curing measures shall be appropriately adjusted according to the ambient temperature and humidity. When the temperature is below 5°C, insulation measures shall be taken, such as covering with quilts and using heating equipment, to prevent the concrete from freezing; when the humidity is greater than 85%, dehumidification measures shall be taken, such as ventilation, to prevent water stains and mold on the concrete surface. At the same time, the temperature and humidity during the curing process shall be monitored in real time and the data shall be recorded so as to adjust the curing measures in time to ensure that the concrete is cured in a suitable environment and achieve good strength and durability.

[0075] Quality testing methods and standards

[0076] After the maintenance is completed, non-destructive testing methods are used to inspect the quality of the connection parts to ensure that the connection strength meets the design requirements. For example, ultrasonic testing is used to detect internal defects of concrete, with a detection frequency of 5MHz-10MHz and a detection accuracy of less than 2mm. Ultrasonic testing can detect defects such as holes, cracks, and looseness inside the concrete. The quality of the concrete can be judged by analyzing parameters such as the ultrasonic propagation speed and waveform. The tensile strength test is used, with no less than 3 groups of test samples, and the average value of the test results is not less than 95% of the design strength. The tensile strength test can directly reflect the mechanical properties of concrete. By making standard specimens and conducting tensile tests in the laboratory, the tensile strength data of the concrete can be obtained. During the quality inspection process, operations should be strictly carried out in accordance with relevant standards and specifications to ensure the accuracy and reliability of the test results.

[0077] Establishment and application of quality traceability system

[0078] Establish a quality traceability system to record and number each process and material used in the construction process. During the construction process, record in detail the production information of prefabricated coupling beams, the installation of triangular inclined leg supports, the process parameters of on-site construction, the mix ratio and pouring of concrete, etc. Number and record the raw materials used, such as steel bars, concrete, admixtures, etc., including information such as manufacturers, batches, and quality inspection reports. When quality problems occur, the quality traceability system can be used to quickly find the source of the problem, analyze the cause, and take corresponding corrective measures. For example, if the concrete strength is found to be insufficient during quality inspection, the traceability system can be used to find problems in the mix ratio of concrete, the quality of raw materials, the pouring process, etc., so as to make targeted improvements and treatments to improve the efficiency and accuracy of quality management.

[0079] Building Structure

[0080] The present invention also discloses a building structure, which is constructed by using the above-mentioned prefabricated connecting beam triangular inclined leg support local cast-in-place construction method. This building structure has the following advantages:

[0081] Superior structural performance

[0082] The high-precision manufacturing and installation process of prefabricated coupling beams and triangular diagonal leg supports, as well as the reasonable local cast-in-place connection method, significantly improve the overall strength, stability and seismic performance of the building structure. The reliable connection between the prefabricated coupling beams and triangular diagonal leg supports can effectively transfer loads and reduce the risk of structural deformation and damage. When natural disasters such as earthquakes occur, the structure can better maintain its integrity and ensure the safety of personnel and property.

[0083] Reliable construction quality

[0084] Through strict construction quality control measures, such as strict requirements on hole diameter, installation accuracy, concrete quality, etc., as well as the use of advanced testing technology and quality traceability system, the construction quality of the building structure is ensured, which reduces quality defects and hidden dangers in construction, improves the reliability and durability of the building, and reduces the cost of later maintenance and repair.

[0085] High construction efficiency

[0086] Prefabricated coupling beams are prefabricated in factories and can be carried out simultaneously with other processes such as on-site foundation construction, shortening the overall construction period. The workload of local cast-in-place on site is relatively small, and reasonable construction technology and equipment are used to increase the construction speed. At the same time, BIM technology is used for construction simulation and collision detection to solve possible problems in construction in advance, further optimize the construction process, and improve construction efficiency.

[0087] Environmental protection and energy saving

[0088] Prefabricated construction reduces the amount of wet work on site, reduces noise, dust and other pollution during construction, and meets environmental protection requirements. At the same time, reasonable material selection and construction process optimization improve resource utilization efficiency, reduce energy consumption, and have good energy-saving and environmental protection benefits.

[0089] In summary, this building structure constructed by the prefabricated coupling beam triangular inclined leg support local cast-in-place construction method has significant advantages in structural performance, construction quality, construction efficiency, environmental protection and energy saving, and has broad application prospects and promotion value.

[0090] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for local cast-in-place construction of prefabricated connecting beam triangular oblique leg supports, characterized in that: The following steps are involved: S1. Prefabricated coupling beam production: High-strength concrete and steel bars are used in the prefabrication factory to make prefabricated coupling beams. Steel bars are arranged in the coupling beams, and the yield strength of the steel bars is not less than 400MPa. Steel bar holes for connecting with the triangular inclined leg supports and connection parts for later cast-in-place are reserved in the coupling beams. The diameter error of the holes is controlled within ±2mm, and the inner wall of the holes is smoothed. A rough surface is set on the surface of the prefabricated coupling beams, and the roughening process is adopted to make the average roughness of the rough surface reach more than 6μm; S2. Fabrication and installation of triangular slanted leg supports: Use high-strength steel to make triangular slanted leg supports. The angle of the slanted leg is between 40° and 50°. The optimal angle value is determined based on the stress analysis and simulation calculation of the building structure. The wall thickness of the slanted leg support steel is not less than 10mm, and key parts are strengthened, such as welding stiffening ribs. The prepared triangular slanted leg support is installed at the predetermined position through embedded parts or bolted connection, and connected to the main body of the building structure. The position accuracy error of the embedded parts is controlled within ±3mm, and the tightening force of the bolts reaches the specified torque value. After the installation is completed, it is inspected and accepted to ensure that the installation accuracy error is controlled within ±5mm. The surface of the triangular slanted leg support is treated with anti-corrosion, using advanced anti-corrosion paint or galvanizing technology, and the coating thickness is not less than 80μm; S3. On-site positioning and adjustment: The prefabricated connecting beam is transported to the construction site and installed by hoisting equipment. During the hoisting process, special hoists are used to ensure the balance and safety of the prefabricated connecting beam. The total station is used for on-site positioning to accurately connect the connection parts of the prefabricated connecting beam and the triangular oblique leg support. The adjustment deviation is within ±3mm. Temporary supports are set during the installation of the prefabricated connecting beam. The temporary supports are adjustable steel structure supports with a bearing capacity of not less than 1.5 times the dead weight of the prefabricated connecting beam to ensure stability during the installation process. The temporary supports are removed after the cast-in-place concrete reaches 75% of the design strength. S4. Local cast-in-place connection: Partial casting is carried out at the connection between the precast coupling beam and the triangular oblique leg support and the gap between the precast coupling beams. Micro-expansive concrete is used, and its expansion rate is controlled between 0.02% and 0.04% to ensure that the gap can be fully filled during the concrete hardening process and reduce the occurrence of shrinkage cracks. The density of concrete is ensured during pouring. High-frequency vibrators are used for vibration. The vibration time is controlled between 30-60s. There is no honeycomb surface phenomenon. The strength grade of the cast-in-place part is not lower than the strength grade of the precast coupling beam, and an appropriate amount of high-performance admixtures, including water reducers and impermeability agents, are added to the concrete; S5. Maintenance and quality inspection: The cast-in-place parts shall be maintained for no less than 10 days. The maintenance measures shall be appropriately adjusted according to the ambient temperature and humidity. The maintenance method of covering and moisturizing shall be adopted. The maintenance materials shall be geotextile or plastic film. During the maintenance process, the temperature and humidity shall be monitored in real time and the data shall be recorded. When the temperature is lower than 5°C or the humidity is higher than 85%, insulation or dehumidification measures shall be taken, specifically: heating equipment shall be used to increase the temperature or ventilation equipment shall be used to reduce the humidity; After the maintenance is completed, the quality of the connection parts is inspected by non-destructive testing methods. The non-destructive testing methods include using ultrasonic waves to detect internal defects of concrete. The detection frequency is 5MHz-10MHz and the detection accuracy is within 2mm. The tensile strength test is adopted, and the test samples are not less than 3 groups. The average value of the test results is not less than 95% of the design strength.

2. The local cast-in-place construction method of prefabricated coupling beam triangular oblique leg support according to claim 1 is characterized in that: In the step S1, an intelligent sensor is embedded in the prefabricated coupling beam to monitor the stress, strain and temperature parameters of the coupling beam in real time, and the accuracy error of the sensor does not exceed ±1%.

3. The local cast-in-place construction method of prefabricated coupling beam triangular oblique leg support according to claim 1 is characterized in that: In the step S2, a shock absorbing device is provided at the connection position between the triangular oblique leg support and the main body of the building structure, including a rubber pad or a shock absorbing spring, to reduce the influence of external forces such as earthquakes on the structure, and the shock absorbing coefficient of the shock absorbing device is not less than 0.

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4. The local cast-in-place construction method of prefabricated coupling beam triangular oblique leg support according to claim 1 is characterized in that: In the S3 step, BIM technology is used to perform construction simulation and collision detection, so as to discover and solve problems that may arise during the construction process in advance and improve construction efficiency and quality.

5. The local cast-in-place construction method of prefabricated coupling beam triangular oblique leg support according to claim 1 is characterized in that: In the step S4, before pouring concrete, the steel bars at the connection parts are derusted and cleaned, and mechanical or chemical rust removal methods are used to ensure that the rust removal level of the steel bar surface reaches Sa2.5 or above, and a detergent is used to clean the steel bar surface to ensure good bonding between the steel bar and the concrete.

6. The local cast-in-place construction method of prefabricated coupling beam triangular oblique leg support according to claim 1 is characterized in that: In the step S5, a quality traceability system is established to record and number each process and material used in the construction process so that it can be traced and analyzed when quality problems occur.

7. A building structure, characterized in that: It is constructed by adopting the local cast-in-place construction method of the prefabricated connecting beam triangular inclined leg support as described in any one of claims 1-6.

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