Green low-carbon prefabricated building structure and construction connection method

Abstract

The invention relates to the technical field of prefabricated buildings, and discloses a green low-carbon prefabricated building structure and a construction connecting method.The green low-carbon prefabricated building structure comprises a prefabricated wall, mortise and tenon grooves are formed in the left side and the right side of the prefabricated wall correspondingly, water-swelling waterstops are fixedly connected to the sides, adjacent to the prefabricated wall, of the interiors of the mortise and tenon grooves correspondingly, and an embedding strip is fixedly connected to the top of the prefabricated wall; the top of the embedded strip is fixedly connected with two locking mechanisms, an embedded groove is formed in the bottom of the prefabricated wall, two placement grooves are formed in the top of the inner wall of the embedded groove, butt joint sleeves are fixedly connected into the two placement grooves, and two through grooves are formed in one side of the prefabricated wall. The lock tongue is pushed by the extrusion rod to rotate and be clamped into an empty groove of the butt joint sleeve to form a mechanical occlusion anchoring structure, during installation, once a locking mechanism completes occlusion, even if hoisting equipment is withdrawn, the prefabricated wall can be kept stable, deviation or falling caused by external force is avoided, time and manpower needed by an additional reinforcing procedure are reduced, and the overall installation efficiency is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and in particular to a green and low-carbon prefabricated building structure and a construction connection method. Background Art

[0002] Prefabricated buildings, with their advantages of efficient construction and controllable quality, have occupied an increasingly important position in the modern construction industry and have become a key force in promoting the process of building industrialization. They pre-manufacture building components in the factory and then transport them to the site for assembly, which significantly shortens the construction period, reduces on-site wet work and construction waste, and effectively improves building production efficiency and quality stability. In the connection process of prefabricated buildings, traditional technology has long relied on secondary reinforcement after hoisting to maintain structural stability. The bolt reinforcement method requires a large number of holes to be reserved on the surface of the prefabricated components, which not only weakens the original mechanical properties of the wall, but also often causes bolts to loosen due to changes in ambient temperature and building vibrations, resulting in slight displacement of the prefabricated wall after installation, and even causing deformation of the overall structure over time. Welding reinforcement requires professional welders to complete in a high-altitude working environment. The high temperature generated during welding can easily cause brittleness on the surface of the component, affecting the durability of the material. In addition, each welding point requires subsequent treatment such as cooling and polishing, and the process is cumbersome and complicated.

[0003] Both of these traditional methods require additional tools and manpower for secondary operations, and cannot achieve immediate stabilization during the lifting process. As a result, the prefabricated wall is still at risk of falling off due to external interference after being separated from the lifting equipment. This not only prolongs the construction period, but also increases the safety hazards of high-altitude operations. It is difficult to meet the urgent needs of modern building industrialization for efficient and safe construction. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a green and low-carbon prefabricated building structure and structural connection method, which solves the risk of prefabricated walls falling off due to external interference after being separated from the lifting equipment, which not only prolongs the construction period but also increases the safety hazards of high-altitude operations.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a green and low-carbon prefabricated building structure, including a prefabricated wall, wherein mortise and tenon grooves are provided on both sides of the prefabricated wall, and a water-swelling waterstop is fixedly connected to the side adjacent to the prefabricated wall in the mortise and tenon groove, a fitting strip is fixedly connected to the top of the prefabricated wall, and two locking mechanisms are fixedly connected to the top of the fitting strip, a fitting groove is provided at the bottom of the prefabricated wall, two placement grooves are provided at the top of the inner wall of the fitting groove, and docking sleeves are fixedly connected in the two placement grooves, two through grooves are provided on one side of the prefabricated wall, an extrusion rod is fixedly connected to the top of the inner wall of the docking sleeve, and mortise and tenon columns are provided in the mortise and tenon grooves on both sides.

[0006] By adopting the above technical solution, the cooperation between the mortise and tenon column and the mortise and tenon groove forms a mechanical connection skeleton, and the water-expanding waterstop strip realizes waterproof sealing simultaneously. The synergistic effect of the two prevents water seepage from appearing in gaps at the wall joints; the fitting strips, fitting grooves, locking mechanisms and docking sleeves cooperate to achieve precise positioning and firm locking of the upper and lower layers of the prefabricated wall, ensuring the stability of the overall structure of the building. Compared with the traditional splicing method, it reduces the problems of sealant aging and loose connections.

[0007] Preferably, the two locking mechanisms both include a locking sleeve, a locking groove is provided on the surface of the locking sleeve, and limiting blocks are fixedly connected on both sides of the inner diameter of the locking sleeve. A support rod is provided between the two limiting blocks, a rebound spring is provided on the surface of the support rod, and a lock tongue is rotatably connected to one end of the support rod.

[0008] By adopting the above technical solution, the limiting block cooperates with the rebound spring, so that the support rod can move stably when subjected to force and drive the lock tongue to retract and retract. The structural design of the locking sleeve, docking sleeve and extrusion rod ensures that the lock tongue is automatically triggered and engaged during the descent of the prefabricated wall, forming a reliable mechanical locking structure. This eliminates the need for manual secondary operation and greatly improves the connection efficiency and stability.

[0009] A green and low-carbon prefabricated building structural connection method, the structural connection method comprising the following steps: S1. Insert the mortise and tenon column into the mortise and tenon groove of the adjacent prefabricated wall, so that the water-expandable waterstop is compressed and deformed to 60%-80% of its original thickness; S2. Hoist the upper prefabricated wall so that its fitting strips are aligned with the fitting grooves of the lower prefabricated wall; S3. Lower the upper prefabricated wall until the interlocking strip is completely inserted into the interlocking groove. At this time, the locking sleeve of the locking mechanism is inserted into the docking sleeve. As the upper prefabricated wall is lowered, the extrusion rod moves downward until it contacts the support rod of the locking mechanism on the lower prefabricated wall. S4, the extrusion rod pushes the support rod to compress the rebound spring. As the support rod descends, the lock tongue is rotated 90 degrees and extends out of the locking groove, and is locked into the corresponding empty groove position on the docking sleeve.

[0010] By adopting the above technical solution, the connection process of the steps clarifies the operation sequence of the prefabricated wall from horizontal splicing to vertical fixation. The linkage and coordination between the components realize the automation of the connection process, which reduces installation errors compared with manual operation, avoids the use of complex tools, and reduces construction difficulty and time cost.

[0011] Preferably, in step S1, nano-silica modified lubricating paste is coated on the surface of the mortise and tenon column before insertion, and the friction coefficient is controlled within the range of 0.12-0.18.

[0012] By adopting the above technical solution, the nano-silica modified lubricating paste significantly reduces the insertion resistance of the mortise and tenon column, ensuring that it can be inserted into the mortise and tenon groove accurately and evenly, avoiding local uneven force damage of the waterstop due to excessive friction, and at the same time reducing the operating intensity of workers, ensuring that the compression of the waterstop meets the design requirements, and improving the waterproof effect.

[0013] Preferably, the step S4 further includes a self-check process: When the lock tongue is rotated 90 degrees and fully extended, it is possible to directly observe from the through slot whether the lock tongue is locked in place.

[0014] By adopting the above technical solution, the visual design of the through groove and lock tongue allows construction workers to quickly determine whether the lock tongue is fully engaged without the help of additional detection equipment, effectively avoiding safety hazards caused by loose connections and improving quality inspection efficiency and accuracy.

[0015] Preferably, a calibration step is performed before step S2, comprising the following steps: Use a laser locator to scan the fitting groove position, generate 3D point cloud data and compare it with the BIM model; When the position deviation is greater than 1.0 mm, the lifting path correction parameters are automatically generated, and the spatial posture of the prefabricated wall is adjusted through the hydraulic fine-tuning device.

[0016] By adopting the above technical solution, laser positioning and BIM model comparison can achieve millimeter-level precise calibration of the prefabricated wall installation position, and the hydraulic fine-tuning device can correct the deviation in real time to avoid the impact of cumulative installation errors on the overall structure of the building. It is especially suitable for buildings with complex shapes and can enhance the building's earthquake and wind resistance.

[0017] Preferably, the prefabricated wall is a gradient composite structure, which comprises, from the inside to the outside: The structural load-bearing layer is made of fiber-reinforced lightweight aggregate concrete, using ceramsite or recycled aggregate as lightweight aggregate, and the fiber content is 0.8% to 2.5% by volume; Lightweight functional layer, used for fixing and bonding to the outside of the structural load-bearing layer, made of foamed cement or solid waste-based insulation material; The protective surface layer is used to be fixedly bonded to the outside of the lightweight functional layer and is made of ultra-high performance concrete or engineering cement-based composite materials.

[0018] By adopting the above technical solution, the structural load-bearing layer ensures the mechanical properties of the wall, the lightweight functional layer achieves efficient thermal insulation, and the protective surface layer improves the durability of the wall. The three-layer composite structure performs its respective functions. At the same time, low-carbon materials such as expanded clay and solid waste are used. Compared with traditional single-material walls, it reduces carbon emissions and material costs while ensuring performance.

[0019] Preferably, in step S4, after the lock tongue rotates 90° and extends out of the locking slot, the upper prefabricated wall needs to be kept stationary for 10-15 seconds, and the entire connection process is completed after the rebound spring is stabilized.

[0020] By adopting the above technical solution, the 10-15 seconds of static time ensures that the rebound spring is fully and stably stressed, so that the lock tongue and the docking sleeve slot are fully engaged, preventing the connection from loosening due to the lock tongue not being in place, and further enhancing the reliability and stability of the prefabricated wall connection.

[0021] Preferably, in step S3, when the fitting strip enters the fitting groove, an assembly gap of 0.5-1.0 mm is reserved between the fitting strip and the side wall of the fitting groove to accommodate slight deformation of the prefabricated wall caused by changes in ambient temperature.

[0022] By adopting the above technical solution, the assembly gap of 0.5-1.0mm reserves deformation space for the prefabricated wall due to thermal expansion and contraction, avoiding stress caused by temperature changes that may cause wall cracking or damage to the connection parts. The elastic sealant simultaneously fills the gap, taking into account both waterproofing and deformation adaptability.

[0023] Preferably, in step S1, when the mortise and tenon column is inserted into the mortise and tenon groove, a staged insertion method is adopted, first inserting it to 40%-50% of the length of the mortise and tenon column, observing the water-swelling waterstop, then inserting it to 60%-70% of the remaining length of the mortise and tenon column, and then observing the water-swelling waterstop, and finally completely inserting the mortise and tenon column so that the water-swelling waterstop is evenly compressed and deformed and the surface is not damaged.

[0024] By adopting the above technical solution, the water-swelling waterstop is gradually and evenly compressed by a staged insertion method. Observation at each stage can timely detect abnormalities such as wrinkles and damage in the waterstop, ensuring that the waterstop fully exerts its waterproof function. Compared with a one-time insertion, the installation quality and waterproof reliability of the waterstop are significantly improved.

[0025] The present invention provides a green and low-carbon prefabricated building structure and a structural connection method. It has the following beneficial effects: 1. In the present invention, a locking mechanism is provided, and an extrusion rod is used to push the lock tongue to rotate and snap into the empty groove of the docking sleeve, forming a mechanical bite anchoring structure. During installation, once the locking mechanism is engaged, the prefabricated wall can remain stable even if the lifting equipment is withdrawn, avoiding displacement or falling off due to external forces. Compared with the traditional prefabricated building method of secondary welding or bolt reinforcement after lifting, this solution greatly simplifies the construction process, reduces the time and manpower required for additional reinforcement steps, and significantly improves the overall installation efficiency.

[0026] 2. In the present invention, the automatic locking method of the locking mechanism and the docking sleeve utilizes the linkage of the extrusion rod and the rebound spring to automatically complete the locking during the lowering and fitting process of the prefabricated wall. This tool-free and operation-free mechanical locking mode is different from the traditional connection method that requires manual tightening of bolts or welding fixation. It greatly shortens the installation time of a single prefabricated wall, and the engagement status of the lock tongue can be directly observed through the through slot, which reduces the difficulty of quality inspection and improves the efficiency of construction quality control.

[0027] 3. In the present invention, the prefabricated wall adopts a gradient composite structure design, which consists of a structural load-bearing layer, a lightweight functional layer and a protective surface layer. The structural load-bearing layer is made of fiber-reinforced lightweight aggregate concrete, which takes into account both strength and weight reduction requirements. The lightweight functional layer uses foamed cement or solid waste-based insulation materials to effectively improve the thermal insulation performance of the wall. The protective surface layer is made of ultra-high performance concrete to enhance the impact resistance and weather resistance of the wall. Compared with a single material wall, this structure not only meets the building load-bearing requirements, but also extends the service life of the wall. At the same time, through the application of solid waste-based materials, it reduces the consumption of natural resources, effectively reduces carbon emissions during construction and use, and achieves green and low-carbon goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional diagram of a green and low-carbon prefabricated building structure according to the present invention; Figure 2 This is a schematic diagram of a prefabricated wall of a green and low-carbon prefabricated building structure according to the present invention; Figure 3 This is a schematic cross-sectional view of a prefabricated wall of a green and low-carbon prefabricated building structure according to the present invention; Figure 4 This is a schematic diagram of a locking mechanism for a green and low-carbon prefabricated building structure according to the present invention; Figure 5 This is a cross-sectional schematic diagram of a locking mechanism and a docking sleeve of a green and low-carbon prefabricated building structure of the present invention; Figure 6 The present invention is a flowchart of the steps of a green and low-carbon prefabricated building structure connection method.

[0029] Among them, 1. Prefabricated wall; 2. Mortise and tenon column; 3. Fitting strip; 4. Through groove; 5. Locking mechanism; 501. Locking sleeve; 502. Locking groove; 503. Support rod; 504. Lock tongue; 505. Limiting block; 506. Rebound spring; 6. Water-expanding waterstop; 7. Mortise and tenon groove; 8. Fitting groove; 9. Placement groove; 10. Docking sleeve; 11. Extrusion rod. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] Please see the attached Figure 1 -Attached Figure 5 The embodiment of the present invention provides a green and low-carbon prefabricated building structure, including a prefabricated wall 1, with mortise and tenon grooves 7 on both sides of the left and right sides of the prefabricated wall 1, and a water-swelling waterstop 6 is fixedly connected to the mortise and tenon groove 7 on the side adjacent to the prefabricated wall 1, a fitting strip 3 is fixedly connected to the top of the prefabricated wall 1, and two locking mechanisms 5 are fixedly connected to the top of the fitting strip 3, a fitting groove 8 is provided at the bottom of the prefabricated wall 1, and two placement grooves 9 are provided at the top of the inner wall of the fitting groove 8, and a docking sleeve 10 is fixedly connected to the two placement grooves 9, two through grooves 4 are provided on one side of the prefabricated wall 1, and an extrusion rod 11 is fixedly connected to the top of the inner wall of the docking sleeve 10, and mortise and tenon columns 2 are provided in the mortise and tenon grooves 7 on both sides.

[0032] Specifically, the mortise and tenon groove 7 and the mortise and tenon column 2 adopt a concave-convex adaptation design, and the two cooperate to form a tight mechanical bite structure, which effectively enhances the connection strength and stability between the prefabricated walls and resists the horizontal shear force. The water-swelling waterstop 6 is arranged on the inner side of the mortise and tenon groove 7. During the insertion process of the mortise and tenon column 2, it is squeezed and deformed to form an initial seal. If water seeps in later, the waterstop expands with water to further fill the tiny gaps and achieve dynamic waterproofing. The shapes and sizes of the docking sleeve 10 and the locking sleeve 501 match each other to ensure the smooth locking process. The opening position of the through groove 4 corresponds to the movement trajectory of the lock tongue 504, which is convenient for construction personnel to observe the connection status. The water-swelling waterstop 6 adopts the PN-300 type, and the expansion rate is ≥300%. The water-swelling waterstop 6 and the prefabricated wall 1 are cast as one.

[0033] Both locking mechanisms 5 include a locking sleeve 501, a locking groove 502 is provided on the surface of the locking sleeve 501, and limiting blocks 505 are fixedly connected on both sides of the inner diameter of the locking sleeve 501. A support rod 503 is provided between the two limiting blocks 505, and a rebound spring 506 is provided on the surface of the support rod 503. A lock tongue 504 is rotatably connected to one end of the support rod 503.

[0034] Specifically, an extended block is provided at the bottom of the locking mechanism 5 for being directly integrally formed with the prefabricated wall 1 during casting.

[0035] Please see the attached Figure 6 A green and low-carbon prefabricated building structural connection method, the structural connection method comprising the following steps: S1. Insert the mortise and tenon column 2 into the mortise and tenon groove 7 of the adjacent prefabricated wall 1, so that the water-expandable waterstop 6 is compressed and deformed to 60%-80% of its original thickness; S2, hoisting the upper prefabricated wall 1 so that its fitting strips 3 are aligned with the fitting grooves 8 of the lower prefabricated wall 1; S3. Lower the upper prefabricated wall 1 until the interlocking strip 3 completely enters the interlocking groove 8. At this time, the locking sleeve 501 of the locking mechanism 5 is inserted into the docking sleeve 10. As the upper prefabricated wall 1 is lowered, the extrusion rod 11 moves downward until it contacts the support rod 503 of the locking mechanism 5 on the lower prefabricated wall 1. S4, the extrusion rod 11 pushes the support rod 503 to compress the rebound spring 506. As the support rod 503 descends, the lock tongue 504 is rotated 90 degrees and extends out of the locking groove 502, and is locked into the corresponding empty groove position on the docking sleeve 10.

[0036] Specifically, in S1, a scale mark is set on the side of the prefabricated wall 1 to judge the insertion depth of the mortise and tenon column 2; an electric push rod device is used to insert the mortise and tenon column 2, and the push rod speed is adjustable, with an initial speed set at 100 mm / min and reduced to 50 mm / min when approaching the predetermined depth; The hoisting equipment in S2 is equipped with a high-precision inclination sensor to monitor the horizontality of the prefabricated wall 1 in real time. When the deviation exceeds 0.5°, it will automatically alarm and make adjustments. Fluorescent marking points are set around the fitting groove 8 to assist in the alignment operation of the fitting strip 3. In S3, a pressure sensor is installed in the docking sleeve 10 to monitor the resistance change during the insertion of the locking sleeve 501. When the resistance suddenly changes, the descent is paused to check whether there is any foreign object blocking it. When the fitting strip 3 enters the fitting groove 8, the descent speed is monitored by displacement sensors installed at the four corners of the prefabricated wall to maintain a uniform descent speed. The matching surfaces of the lock tongue 504 and the lock groove 502 in S4 are serrated, forming a mechanical self-locking after being locked in; the edge of the empty groove on the docking sleeve 10 is chamfered to facilitate the lock tongue 504 to slide in smoothly.

[0037] In step S1, nano-silicon dioxide modified lubricating paste is coated on the surface of the mortise and tenon column 2 before insertion, and the friction coefficient is controlled within the range of 0.12-0.18.

[0038] Specifically, the coating thickness of the nano-silica modified lubricating paste is controlled at 0.2-0.3 mm, and the coating operation is carried out using automatic spraying equipment. After spraying, it is left to stand for 5-10 minutes to allow the lubricating paste to fully adhere; the surface of the mortise and tenon groove 7 of the prefabricated wall 1 is roughened, and the roughness Ra value is controlled at 6.3-12.5 μm to enhance the bonding strength between the lubricating paste and the contact surface.

[0039] Step S4 also includes a self-test process: When the locking tongue 504 is rotated 90 degrees and fully extended, it is possible to directly observe from the through slot 4 whether the locking tongue 504 is locked in place.

[0040] Specifically, the width of the through slot 4 is designed to be 1.2 times the width of the locking tongue 504 to ensure that there is no blind spot for observation.

[0041] Before step S2, a calibration step is performed, including the following steps: Scan the position of the fitting groove 8 with a laser positioning device to generate three-dimensional point cloud data and compare it with the BIM model; When the position deviation is greater than 1.0 mm, the hoisting path correction parameters are automatically generated, and the spatial posture of the prefabricated wall 1 is adjusted through the hydraulic fine-tuning device.

[0042] Specifically, the laser positioning device has a scanning frequency of 10 times per second, ensuring real-time capture of position changes in the interlocking groove 8; the thermal expansion and contraction coefficients of the prefabricated wall 1 are pre-entered into the BIM model, and errors caused by temperature influences are automatically corrected during comparison; the minimum adjustment accuracy of the hydraulic fine-tuning device is 0.1mm, meeting high-precision installation requirements.

[0043] The prefabricated wall 1 is a gradient composite structure, which includes, from the inside to the outside: The structural load-bearing layer is made of fiber-reinforced lightweight aggregate concrete, using ceramsite or recycled aggregate as lightweight aggregate, and the fiber content is 0.8% to 2.5% by volume; Lightweight functional layer, used for fixing and bonding to the outside of the structural load-bearing layer, made of foamed cement or solid waste-based insulation material; The protective surface layer is used to be fixedly bonded to the outside of the lightweight functional layer and is made of ultra-high performance concrete or engineering cement-based composite materials.

[0044] Specifically, the thickness of the structural load-bearing layer accounts for 60%, the content of recycled aggregate in the lightweight aggregate is 40%, the steel fiber length is 30mm / diameter is 0.3mm, the thermal conductivity of the lightweight functional layer is ≤0.08W / (m·K), the solid waste-based material contains 30% fly ash microbeads, the thickness of the protective surface layer is 15mm, the UHPC water-cement ratio is 0.18, the PVA fiber content in ECC is 2vol%, and the water-resistance grade is ≥P12.

[0045] In step S4, after the locking tongue 504 rotates 90 degrees and extends out of the locking groove 502, the upper prefabricated wall 1 needs to be kept still for 10-15 seconds until the force on the rebound spring 506 is stabilized, and then the entire connection process is completed.

[0046] Specifically, a timer is set to control the static time, and the time error does not exceed ±0.5 seconds; during the static process, the compression change of the rebound spring 506 is continuously monitored, and if the change exceeds 0.5mm, the locking operation is performed again.

[0047] In step S3 , when the fitting strip 3 enters the fitting groove 8 , an assembly gap of 0.5-1.0 mm is reserved between the fitting strip 3 and the side wall of the fitting groove 8 to accommodate slight deformation of the prefabricated wall 1 due to changes in ambient temperature.

[0048] Specifically, the assembly gap is filled with elastic sealant, and the displacement capacity of the sealant is ≥25% to adapt to the expansion and contraction deformation of the prefabricated wall 1 due to temperature changes; a dustproof net is set at the assembly gap between the fitting strip 3 and the fitting groove 8 to prevent dust and other foreign matter from entering and affecting the connection performance.

[0049] In step S1, when the mortise and tenon column 2 is inserted into the mortise and tenon groove 7, a staged insertion method is adopted. First, it is inserted to 40%-50% of the length of the mortise and tenon column 2, and the water-swelling waterstop 6 is observed. Then, 60%-70% of the remaining length of the mortise and tenon column 2 is inserted, and the water-swelling waterstop 6 is observed again. Finally, the mortise and tenon column 2 is completely inserted so that the water-swelling waterstop 6 is evenly compressed and deformed and the surface is not damaged.

[0050] Specifically, insert the waterstop to a depth of 45% and stay for 30 seconds. Laser scan the deformation uniformity of the waterstop. Insert the waterstop to a depth of 80% and stay for 60 seconds. The infrared thermal imager detects the friction temperature rise to be ≤15°C. After full insertion, the speed is reduced to 0.1m / s. A 2-megapixel industrial camera is used for damage detection, and a machine learning algorithm is used to identify surface cracks (accuracy 0.1mm).

[0051] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A green and low-carbon prefabricated building structure, comprising a prefabricated wall (1), characterized in that: The prefabricated wall (1) is provided with mortise and tenon grooves (7) on both sides, and a water-expandable waterstop (6) is fixedly connected to the side adjacent to the prefabricated wall (1) in the mortise and tenon grooves (7). The top of the prefabricated wall (1) is fixedly connected to a fitting strip (3), and the top of the fitting strip (3) is fixedly connected to two locking mechanisms (5). The prefabricated wall (1) is provided with a fitting groove (8) at the bottom, and two placement grooves (9) are provided at the top of the inner wall of the fitting groove (8). A docking sleeve (10) is fixedly connected to the two placement grooves (9). Two through grooves (4) are provided on one side of the prefabricated wall (1), and an extrusion rod (11) is fixedly connected to the top of the inner wall of the docking sleeve (10). Mortise and tenon columns (2) are provided in the mortise and tenon grooves (7) on both sides.

2. A green and low-carbon prefabricated building structure according to claim 1, characterized in that: The two locking mechanisms (5) each include a locking sleeve (501), a locking groove (502) is provided on the surface of the locking sleeve (501), limiting blocks (505) are fixedly connected to both sides of the inner diameter of the locking sleeve (501), a support rod (503) is provided between the two limiting blocks (505), a rebound spring (506) is provided on the surface of the support rod (503), and a locking tongue (504) is rotatably connected to one end of the support rod (503).

3. A green and low-carbon prefabricated building structure connection method, characterized in that: For a green and low-carbon prefabricated building structure according to any one of claims 1 and 2, the construction connection method comprises the following steps: S1, inserting the mortise and tenon column (2) into the mortise and tenon groove (7) of the adjacent prefabricated wall (1), so that the water-expandable waterstop (6) is compressed and deformed to 60%-80% of the original thickness; S2, hoisting the upper prefabricated wall (1) so that its fitting strip (3) is aligned with the fitting groove (8) of the lower prefabricated wall (1); S3, lowering the upper prefabricated wall (1) until the engaging strip (3) completely enters the engaging groove (8), at which time the locking sleeve (501) of the locking mechanism (5) is inserted into the docking sleeve (10), and as the upper prefabricated wall (1) is lowered, the extrusion rod (11) moves downward until it contacts the support rod (503) in the locking mechanism (5) on the lower prefabricated wall (1); S4, the extrusion rod (11) pushes the support rod (503) to compress the rebound spring (506), and as the support rod (503) descends, the lock tongue (504) is caused to rotate 90 degrees and extend out of the locking groove (502), and is locked into the corresponding empty groove position on the docking sleeve (10).

4. A green and low-carbon prefabricated building structure connection method according to claim 3, characterized in that: In the step S1, nano-silicon dioxide modified lubricating paste is coated on the surface of the mortise and tenon column (2) before insertion, and the friction coefficient is controlled within the range of 0.12-0.

18.

5. The green and low-carbon prefabricated building structure connection method according to claim 3 is characterized by: The step S4 also includes a self-test process: When the lock tongue (504) is rotated 90 degrees and fully extended, it is possible to directly observe from the through slot (4) whether the lock tongue (504) is engaged in place.

6. The green and low-carbon prefabricated building structure connection method according to claim 3, characterized in that: The calibration step is performed before step S2, including the following steps: Scan the position of the fitting groove (8) with a laser positioning device to generate three-dimensional point cloud data and compare it with the BIM model; When the position deviation is greater than 1.0 mm, the hoisting path correction parameter is automatically generated, and the spatial posture of the prefabricated wall (1) is adjusted through the hydraulic fine-tuning device.

7. The green and low-carbon prefabricated building structure connection method according to claim 3, characterized in that: The prefabricated wall (1) is a gradient composite structure, which comprises, from the inside to the outside: The structural load-bearing layer is made of fiber-reinforced lightweight aggregate concrete, using ceramsite or recycled aggregate as lightweight aggregate, and the fiber content is 0.8% to 2.5% by volume; Lightweight functional layer, used for fixing and bonding to the outside of the structural load-bearing layer, made of foamed cement or solid waste-based insulation material; The protective surface layer is used to be fixedly bonded to the outside of the lightweight functional layer and is made of ultra-high performance concrete or engineering cement-based composite materials.

8. The green and low-carbon prefabricated building structure connection method according to claim 3 is characterized by: In step S4, after the locking tongue (504) is rotated 90° and extended out of the locking groove (502), the upper prefabricated wall (1) needs to be kept stationary for 10-15 seconds, and the entire connection process is completed after the rebound spring (506) is stabilized by force.

9. The green and low-carbon prefabricated building structure connection method according to claim 3, characterized in that: In step S3, when the engaging strip (3) enters the engaging groove (8), an assembly gap of 0.5-1.0 mm is reserved between the engaging strip (3) and the side wall of the engaging groove (8) to accommodate slight deformation of the prefabricated wall (1) caused by changes in ambient temperature.

10. The green and low-carbon prefabricated building structure connection method according to claim 3, characterized in that: In step S1, when the mortise and tenon column (2) is inserted into the mortise and tenon groove (7), a staged insertion method is adopted. First, the mortise and tenon column (2) is inserted to 40%-50% of its length, and the water-expandable waterstop (6) is observed. Then, the mortise and tenon column (2) is inserted to 60%-70% of the remaining length, and the water-expandable waterstop (6) is observed again. Finally, the mortise and tenon column (2) is completely inserted so that the water-expandable waterstop (6) is uniformly compressed and deformed and the surface is not damaged.

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