L-shaped flue smoke prevention installation method

Abstract

This invention discloses a method for installing an L-shaped flue to prevent smoke leakage, comprising the following steps: optimizing the layout of the grouting port through BIM modeling and marking the cutting boundaries of the aluminum mold; fabricating a triangular grouting port aluminum mold with a guide groove, pre-embedding a pressure sensor and connecting it to a monitoring system; installing a multi-directional dynamic support component and adjusting the contact surface gap based on pre-compensation; forming a sealing layer through grouting in the guide groove, controlling the grouting pressure according to real-time data from the pressure sensor, and generating a density cloud map after initial setting using ultrasonic flaw detection; after installing the bidirectional tensioner, comparing the geometric accuracy with the BIM model using a 3D laser scanner, detecting joints using an infrared thermal imager, and finally integrating the data through a digital platform to generate a traceability label. This method effectively solves the problems of positioning deviation, inadequate sealing, and smoke leakage in traditional construction through thermal displacement pre-compensation design, dynamic adjustment mechanism, pressure feedback grouting, and multi-modal detection system.

Description

Technical Field

[0001] This invention relates to the technical field of building construction, and in particular to a method for installing an L-shaped flue to prevent smoke leakage. Background Technology

[0002] The existing construction process for building smoke exhaust ducts typically employs the following technical solution: First, the geometric dimensions and axial positioning of the reserved openings on each floor slab are re-measured to ensure that the vertical deviation of the openings between upper and lower floors meets the specifications. Before construction, it is necessary to remove any attached materials around the reserved openings, including scum, construction waste, and other obstacles that may affect installation accuracy. For the joint between L-shaped precast components and the wall, the traditional process uses a layered filling method: the first layer of polymer cement mortar is filled to 2 / 3 of the joint depth, and the second layer, while sealing the remaining 1 / 3 of the space, requires the additional application of alkali-resistant fiberglass mesh at the internal corners, with a designed overlap length of no less than 100mm.

[0003] However, existing technologies have significant drawbacks: 1) There is a clear difference in the coefficient of thermal expansion between the L-shaped flue components and the main building structure, making them prone to microcracks under cyclic temperature stress; 2) The layered filling process fails to effectively address stress concentration at the interface of dissimilar materials; 3) Due to construction limitations, the actual overlap length of the mesh fabric often falls short of design standards. These problems lead to structural cracks in the flue system under thermal cycling conditions, particularly at the junction of the L-shaped components and the wall, which can cause smoke leakage, resulting in decreased indoor air quality and functional defects in the residence.

[0004] Therefore, there is an urgent need for an L-shaped flue smoke-proof installation method that can ensure tightness of the gaps and effectively solve the problem of smoke leakage in the later stage without affecting the delivery effect. Summary of the Invention

[0005] In view of this, the present invention provides an L-shaped flue smoke-proof installation method that, without affecting the delivery effect, ensures that the gaps are tight and effectively solves the problem of smoke leakage in the later stage.

[0006] The present invention provides a method for installing an L-shaped flue to prevent smoke leakage, which adopts the following technical solution:

[0007] A method for installing a smoke-proof L-shaped flue includes the following steps:

[0008] Step 1, BIM Pre-visualization and Positioning: Use Revit to create an L-shaped flue and main structure BIM model, and generate an optimized layout drawing of the grouting port; mark the grouting port cutting boundary on the aluminum formwork surface;

[0009] Step 2, Aluminum mold processing with extrusion nozzle: Process the triangular extrusion nozzle according to the BIM drawings, and set the guide groove on the outside of the extrusion nozzle;

[0010] Step 3, Aluminum Mold Pre-embedding and Calibration: Install the aluminum mold with the slurry extrusion port, pre-embed a pressure sensor inside the extrusion port, and connect the pressure sensor to the monitoring terminal;

[0011] Step 4, flue installation;

[0012] Step 5, Dynamic adjustment of the support component:

[0013] When installing a support component with X, Y, and Z-axis telescopic adjustment, tighten the X and Y axes first, leaving room for Z-axis adjustment.

[0014] Based on the pre-compensation amount calculated by BIM, Z-axis adjustment is performed to make the gap between the support and the flue contact surface uniform.

[0015] Step 6, Seal layer construction:

[0016] Cement mortar is injected through a guide channel to form a sealing layer, and the pressure is adjusted to a predetermined MPa value range based on feedback from the pressure sensor. After the mortar has initially set, an ultrasonic flaw detector is used to spirally scan along the mortar extrusion port to generate a density cloud map.

[0017] Step 7: Install the bidirectional tensioner on the sealing layer;

[0018] Step 8, Engineering Inspection:

[0019] Geometric accuracy: A 3D laser scanner is used to compare the BIM model, and an infrared thermal imager is used to scan the seams;

[0020] Data archiving: Upload sensor data and scanning reports to the digital management platform to generate QR code traceability labels.

[0021] Optionally, in step 4, the flue installation includes the following steps:

[0022] Step 41, Initial Positioning: Hoist the flue to the predetermined position and use a rangefinder to ensure that the distance between it and the slurry extrusion port is in a suitable position;

[0023] Step 42, Hydraulic jacking: Start the diagonal jacking device to advance the flue, and simultaneously activate the lateral fine-tuning device to correct the offset in real time based on the feedback from the displacement sensor;

[0024] Step 43, Segmented Extrusion:

[0025] First stage: Push the mortar to 30% of the design displacement, pause for a certain period of time to allow the mortar to initially level;

[0026] Second stage: Push to 70% of the design displacement, pause for a certain period of time to carry out ultrasonic flaw detection, and start the grouting pump when the cavity rate is greater than 1%.

[0027] Third stage: Push to 100% of the design displacement, maintain pressure for 1 minute, and then lock the hydraulic cylinder.

[0028] Optionally, step 7 may include the following steps:

[0029] Step 71: Apply an interface agent to the surface of the sealing layer;

[0030] Step 72: Install the bidirectional tensioner when the surface is dry to the touch and no longer sticky.

[0031] Optionally, in step 72, the bidirectional tensioner includes a transverse clamp, and the transverse tensioning steps of the transverse clamp are as follows:

[0032] Step 721, Initial Tensioning

[0033] Install transverse clamps symmetrically from the center of the mesh fabric to both sides, start the hydraulic pump to apply tension at a specific rate to the predetermined tension range, and simultaneously monitor the gap between the mesh fabric and the base surface. If wrinkles are found, stop immediately and adjust the position of the clamps.

[0034] Step 722, Tension Locking: After reaching the target tension range, use a self-locking anchor to fix the end of the transverse clamp.

[0035] Optionally, in step 72, the bidirectional tensioner includes a longitudinal clamp, and the longitudinal tensioning steps of the longitudinal clamp are as follows:

[0036] Step 723: Install the longitudinal clamp along the length of the mesh fabric and apply the load in two stages:

[0037] First stage: Tension 0.8 kN / m, hold for 10 seconds to eliminate initial relaxation;

[0038] Second stage: Tension 1.0kN / m, held for 20 seconds to complete plastic deformation compensation;

[0039] Step 724, Tension monitoring: Use a displacement sensor to monitor the elongation of the mesh fabric.

[0040] Optionally, during the lateral tensioning process, an infrared device is used to obliquely radiate the surface of the mesh fabric. After preheating to 60°C, the clamps are locked. During the vertical tensioning process, the vertical tensioning and infrared device heating are synchronized.

[0041] First stage heating: 0.8kN / m vertical tension is eliminated and relaxed, and infrared heating is used to raise the temperature to 80℃ to maintain fiber extensibility;

[0042] Second stage heating: 1.0kN / m to compensate for plastic deformation, infrared heating to 90℃ to complete heat setting.

[0043] Optionally, during the heating process, an infrared thermometer can be used to provide real-time feedback on surface temperature fluctuations.

[0044] Optionally, in step 2, the slurry outlet is designed as an asymmetrical triangular cavity.

[0045] Optionally, in step 7, during the engineering inspection, a sealing test is performed. Both ends of the flue are sealed, compressed air is injected, and the pressure drop rate is tested within a specified time to determine whether it is qualified.

[0046] Optionally, the inner side of the aluminum mold with the slurry outlet is provided with an inverted trapezoidal rib.

[0047] In summary, this invention includes at least one of the following beneficial technical effects: BIM pre-simulation and positioning layout, aluminum mold processing with grouting nozzle, aluminum mold pre-embedding and calibration, flue installation, dynamic adjustment of support components, sealing layer construction, installation of bidirectional tensioners, and engineering inspection steps. Through precise pre-simulation and positioning layout, complex grouting nozzle design, dynamic adjustment mechanism, real-time monitoring and quality control methods, and comprehensive engineering inspection methods, it effectively solves the problems of positioning error, installation deviation, incomplete sealing, and smoke leakage hazards existing in the prior art. It has the advantages of improving installation accuracy, enhancing sealing effect, adapting to temperature changes, realizing real-time monitoring and quality control, and comprehensively testing the leak prevention effect. Attached Figure Description

[0048] Figure 1 This is a construction flowchart of an embodiment of the present invention. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1 The present invention will be described in further detail below.

[0050] This invention discloses a method for installing and constructing an L-shaped flue to prevent smoke leakage.

[0051] Reference Figure 1 A method for installing an L-shaped flue to prevent smoke leakage includes the following construction steps:

[0052] Step 1, BIM Pre-visualization and Positioning: Use Revit to create an L-shaped flue and main structure BIM model, generate an optimized layout drawing of the grouting port, and mark the grouting port cutting boundary on the aluminum formwork surface;

[0053] Step 2, Aluminum mold processing with extrusion nozzle: Process the triangular extrusion nozzle according to the BIM drawings, and set the guide groove on the outside of the extrusion nozzle;

[0054] Step 3, Aluminum Mold Pre-embedding and Calibration: Install the aluminum mold with the slurry extrusion port, pre-embed a pressure sensor inside the extrusion port, and connect the pressure sensor to the monitoring terminal;

[0055] Step 4, flue installation;

[0056] Step 5, Dynamic adjustment of the support component:

[0057] When installing a support component with X, Y, and Z-axis telescopic adjustment, tighten the X and Y axes first, leaving room for Z-axis adjustment.

[0058] Based on the pre-compensation amount calculated by BIM, Z-axis adjustment is performed to make the gap between the support and the flue contact surface uniform.

[0059] Step 6, Seal layer construction:

[0060] Cement mortar is injected through a guide channel to form a sealing layer, and the pressure is adjusted to a predetermined MPa value range based on feedback from the pressure sensor. After the mortar has initially set, an ultrasonic flaw detector is used to spirally scan along the mortar extrusion port to generate a density cloud map.

[0061] Step 7: Install the bidirectional tensioner on the sealing layer;

[0062] Step 8, Engineering Inspection:

[0063] Geometric accuracy: A 3D laser scanner is used to compare the BIM model, and an infrared thermal imager is used to scan the seams;

[0064] Data archiving: Upload sensor data and scanning reports to the digital management platform to generate QR code traceability labels.

[0065] Through precise pre-planning and positioning, complex slurry outlet design, dynamic adjustment mechanism, real-time monitoring and quality control, and comprehensive engineering testing methods, this technology effectively solves problems such as positioning errors, installation deviations, incomplete sealing, and potential smoke leakage in existing technologies. It has the advantages of improving installation accuracy, enhancing sealing effect, adapting to temperature changes, achieving real-time monitoring and quality control, and comprehensively testing the leak prevention effect.

[0066] In step 4, the flue installation includes the following steps:

[0067] Initial Positioning: Hoist the flue to the predetermined position and ensure the distance between it and the grouting inlet is appropriate using a rangefinder. Hydraulic Jacking: Activate the diagonal jacking device to advance the flue, simultaneously activating the lateral fine-tuning device to correct the offset in real time based on displacement sensor feedback. Segmented Extrusion: In the first stage, jack to 30% of the design displacement, pause for a certain period to allow the mortar to initially level; in the second stage, jack to 70% of the design displacement, pause for a certain period to perform ultrasonic testing, and start the grouting pump when the void ratio is greater than 1%; in the third stage, jack to 100% of the design displacement, maintain pressure for 1 minute, and then lock the hydraulic cylinder.

[0068] The flue installation method provided in this application aims to solve the problems existing in the prior art, such as microcracks caused by the difference in thermal expansion coefficients between the L-shaped flue component and the main building material, the failure of the layered filling process to effectively solve the stress concentration problem at the interface of heterogeneous materials, and the difficulty in achieving the design standard for the actual overlap length of the mesh fabric. By introducing hydraulic jacking and segmented extrusion technology, precise positioning and real-time adjustment can be achieved during the flue installation process, ensuring the uniform leveling and compactness of the mortar at the joints, thereby effectively avoiding structural cracks and flue gas leakage.

[0069] Specifically, the initial positioning step uses a rangefinder to ensure the accuracy of the distance between the flue and the grouting inlet. The hydraulic jacking step uses diagonal jacks and lateral fine-tuning devices to achieve precise advancement and real-time correction of the flue. The segmented extrusion step uses staged jacking and pauses to ensure the mortar flows evenly at different stages, and ultrasonic flaw detection and a grouting pump further ensure the compactness of the joints. Thus, the entire flue installation process not only improves the accuracy and efficiency of construction but also significantly enhances the sealing and durability of the flue system.

[0070] Apply an interface agent to the surface of the sealing layer and install the bidirectional tensioner when it is surface dry to the touch and no longer sticky.

[0071] Specifically, in step 7, a layer of interface agent is first evenly applied to the surface of the sealing layer. The purpose of the interface agent is to enhance the adhesion between the sealing layer and the biaxial tensioner, ensuring that the subsequently installed biaxial tensioner can firmly adhere to the surface of the sealing layer. After applying the interface agent, it is necessary to wait for it to dry to the point where it is no longer sticky to the touch to avoid poor adhesion caused by installing the biaxial tensioner before the interface agent is completely dry.

[0072] The installation steps of the bidirectional tensioner include lateral tensioning and longitudinal tensioning. During lateral tensioning, lateral clamps are symmetrically installed from the center of the mesh fabric outwards. The hydraulic pump is started to apply tension at a specific rate to the predetermined tension range and maintain it for a specific time. The gap between the mesh fabric and the base surface is monitored simultaneously. If wrinkles are found, the process is immediately stopped and the clamp positions are adjusted. After reaching the target tension range, the ends of the lateral clamps are fixed with self-locking anchors.

[0073] During longitudinal tensioning, longitudinal clamps are installed along the length of the mesh fabric, and loading is performed in two stages: the first stage tension is 0.8 kN / m, held for 10 seconds to eliminate initial slack; the second stage tension is 1.0 kN / m, held for 20 seconds to complete plastic deformation compensation. Displacement sensors are used to monitor the elongation of the mesh fabric to ensure that the tensioning effect achieves the expected result.

[0074] This application solves the problems of poor adhesion and tensioning effect in traditional processes by applying an interface agent to the surface of the sealing layer and installing a bidirectional tensioner when it is surface dry to the touch. Through reasonable tensioning steps and monitoring methods, the density and adhesion between the mesh and the base surface are ensured, thereby effectively preventing structural cracks and flue gas leakage in the flue system under thermal cycling conditions.

[0075] The bidirectional tensioner includes a transverse clamp, and the transverse tensioning steps are as follows:

[0076] Initial tensioning: Install transverse clamps symmetrically from the center of the mesh fabric to both sides, start the hydraulic pump to apply tension to the predetermined tension range at a specific rate, and continue for a specific time. Simultaneously monitor the gap between the mesh fabric and the base surface. If wrinkles are found, stop immediately and adjust the position of the clamps.

[0077] Tension locking: After reaching the target tension range, the end of the transverse clamp is fixed with a self-locking anchor.

[0078] The above technical solution solves the problem of stress concentration at the interface of heterogeneous materials, which traditional methods failed to effectively address during the installation and construction of L-shaped flues to prevent smoke leakage. This stress concentration led to structural cracks in the flue system under thermal cycling conditions. By installing bidirectional tensioners on the sealing layer, the gap between the mesh fabric and the base surface is made uniform, avoiding poor sealing caused by wrinkles.

[0079] Specifically, during the initial tensioning stage, transverse clamps are symmetrically installed from the center of the mesh fabric outwards. The hydraulic pump is activated to apply tension at a specific rate to the predetermined tension range and maintain this tension for a specific time. During this process, the gap between the mesh fabric and the base surface is monitored synchronously. If wrinkles are detected, the process is immediately paused and the clamp positions adjusted to ensure the uniformity and stability of the tensioning effect. After reaching the target tension range, self-locking anchors are used to secure the ends of the transverse clamps, ensuring the durability and reliability of the tension.

[0080] Therefore, this application effectively solves the problem of structural cracks in the flue system caused by stress concentration in the prior art through a specific transverse clamp tensioning step, thereby improving the sealing performance and long-term reliability of the L-shaped flue.

[0081] The bidirectional tensioner includes a longitudinal clamp. The longitudinal tensioning steps are as follows: Install the longitudinal clamp along the length of the mesh fabric and apply load in two stages: First stage: tension 0.8 kN / m, hold for 10 seconds to eliminate initial slack; Second stage: tension 1.0 kN / m, hold for 20 seconds to complete plastic deformation compensation; Tension monitoring: Use a displacement sensor to monitor the elongation of the mesh fabric.

[0082] This invention employs a staged loading method during the longitudinal tensioning process of the bidirectional tensioner. In the first stage, a tension of 0.8 kN / m is applied and held for 10 seconds to eliminate initial slack in the mesh fabric; in the second stage, a tension of 1.0 kN / m is applied and held for 20 seconds to complete plastic deformation compensation. Furthermore, a displacement sensor is used to monitor the elongation of the mesh fabric to ensure the accuracy and reliability of the tensioning process.

[0083] During longitudinal tensioning, the staged loading method effectively eliminates initial slack in the mesh fabric and ensures tight adhesion through plastic deformation compensation. This method not only improves the tensioning effect of the mesh fabric but also effectively avoids insufficient tension caused by initial slack. Using displacement sensors to monitor the elongation of the mesh fabric allows for real-time data acquisition during the tensioning process, ensuring its accuracy and reliability.

[0084] In this embodiment, a stress sensor is also provided in addition to the displacement sensor to further improve the control accuracy of the tensioning process.

[0085] Based on the longitudinal tensioning method using bidirectional tensioners, this invention effectively solves the problems of poor tensioning effect and insufficient tension in existing technologies by using staged loading and displacement sensors to monitor the elongation of the mesh fabric. Compared with existing technologies, the method in this application can ensure the tight fit of the mesh fabric, improve the sealing and structural stability of the L-shaped flue, and further avoid the problem of flue gas leakage, thereby improving the overall air quality and service life of the building.

[0086] During the transverse tensioning process, an infrared device is used to irradiate the surface of the mesh fabric at an angle. After the preheating temperature reaches 60°C, the clamps are locked. During the vertical tensioning process, the vertical tensioning and the infrared device are heated synchronously. The first stage of heating is 0.8 kN / m to eliminate the relaxation of the vertical tension, and the infrared temperature is raised to 80°C to maintain the fiber extensibility. The second stage of heating is 1.0 kN / m to compensate for plastic deformation, and the infrared temperature is raised to 90°C to complete the heat setting.

[0087] Infrared equipment is used to preheat the surface of the mesh fabric. Specifically, during the transverse tensioning process, the surface of the mesh fabric is preheated to 60℃ by radiating infrared light at a 45° angle using the equipment. The clamps are then locked to ensure the mesh fabric maintains an appropriate temperature during tensioning, thereby improving its ductility and tensioning effect. During the vertical tensioning process, the infrared equipment heats the fabric simultaneously in two stages: In the first stage, under a vertical tension of 0.8 kN / m, the infrared equipment raises the temperature to 80℃ to eliminate slack in the mesh fabric; in the second stage, under a vertical tension of 1.0 kN / m, the infrared equipment raises the temperature to 90℃ to complete the plastic deformation compensation and heat setting of the mesh fabric.

[0088] Heating the mesh fabric with infrared equipment can effectively improve its ductility and strength during tensioning, thus ensuring the stability and reliability of the tensioning effect. Specifically, the infrared heating process is divided into two stages, with temperature control under different tensions to ensure optimized performance of the mesh fabric at each stage. The first stage of heating primarily eliminates initial relaxation of the mesh fabric, while the second stage compensates for plastic deformation and performs heat setting. Therefore, the infrared heating process effectively improves the tensioning effect of the mesh fabric and avoids performance instability caused by temperature changes.

[0089] By employing infrared heating devices during the horizontal and vertical tensioning processes, the problems of insufficient ductility and unstable tensioning effects in traditional construction methods are solved. Compared with existing technologies, the technical solution of this application can improve the ductility and tensioning effect of the mesh fabric without affecting construction efficiency, thereby ensuring the overall quality and reliability of the L-shaped flue smoke prevention installation.

[0090] During the heating process, an infrared thermometer is used to provide real-time feedback on surface temperature fluctuations. By monitoring surface temperature fluctuations in real time using an infrared thermometer, temperature uniformity and stability are ensured. This process helps prevent changes in material properties caused by uneven temperature, thereby improving construction quality and reliability. The infrared thermometer can quickly and accurately provide temperature information, allowing operators to adjust the heating equipment promptly to ensure the temperature is controlled within the predetermined range.

[0091] This real-time temperature monitoring method achieves its purpose by establishing a data connection between the infrared thermometer probe and the heating device. The probe continuously collects surface temperature data and transmits the data to a control terminal. The control terminal automatically adjusts the output power of the heating device according to a preset temperature fluctuation range to maintain a stable surface temperature. For example, when the probe detects that the surface temperature exceeds the predetermined range, the control terminal will reduce or increase the power of the heating device to ensure that the temperature returns to the normal range.

[0092] This method effectively avoids the problem of material performance degradation caused by excessive temperature fluctuations, ensuring the stability and consistency of the construction process.

[0093] By introducing an infrared thermometer to provide real-time feedback on surface temperature fluctuations, this invention effectively solves the problem of inaccurate temperature control in existing technologies, improves construction quality and reliability, and ensures the sealing and stability of the flue system. Compared with existing technologies, this invention has significant advantages in temperature control and can better meet the requirements of high-quality construction.

[0094] In step 2, the grouting port is designed as an asymmetrical triangular cavity. In the technical solution of this application, step 2 involves fabricating the triangular grouting port according to the BIM drawings and setting a guide groove on the outside of the grouting port. The asymmetrical triangular cavity design of the grouting port allows for a more uniform distribution of cement mortar during injection, avoiding the problems of mortar accumulation or poor flow that may occur with traditional symmetrical designs. Therefore, the asymmetrical triangular cavity improves the density and uniformity of the mortar to a certain extent, further enhancing the anti-leakage performance of the sealing layer.

[0095] The design of the grouting port for the asymmetric triangular cavity is based on the specific requirements of the BIM model, selecting the corresponding asymmetric angle and side length ratio to adapt to different construction conditions and requirements.

[0096] This technical solution, through the asymmetrical triangular cavity extrusion port design, effectively solves the problems of poor flow and accumulation that may occur during mortar injection in traditional symmetrical designs. Compared with existing technologies, the solution in this application improves the density and uniformity of the mortar, thereby enhancing the anti-leakage performance of the sealing layer, further ensuring the tight bond between the L-shaped flue and the main structure, and solving the problems of micro-cracks and flue gas leakage caused by temperature stress.

[0097] In engineering testing, a sealing test is conducted by sealing both ends of the flue, injecting compressed air, and measuring the pressure drop rate within a specified time to determine whether it is qualified.

[0098] To ensure the airtightness of the L-shaped flue after installation, this application employs a compressed air testing method. Specifically, after the flue is installed and initially sealed, both ends of the flue are sealed, and compressed air is injected to increase the internal pressure. Then, the pressure change within the flue is monitored over a specified time. If the pressure drop rate is within the allowable range, the flue's airtightness is considered satisfactory; otherwise, further processing and adjustments to the sealing measures are required.

[0099] This method effectively detects the sealing performance of flues, ensuring that no smoke leakage occurs during use. By injecting and testing compressed air, the sealing effect of the flue can be quickly and accurately determined, avoiding the subjective judgment errors that may exist in traditional methods. The method of this invention is more accurate and can effectively improve the sealing performance of flues, preventing the impact of smoke leakage on indoor air quality and residential functionality.

[0100] The inner side of the aluminum mold with the grouting nozzle is equipped with an inverted trapezoidal rib. In existing building smoke exhaust duct installation processes, there is a significant difference in the coefficient of thermal expansion between the L-shaped smoke duct component and the building structure, making it prone to micro-cracks under cyclic temperature stress. Furthermore, traditional layered filling processes fail to effectively address stress concentration at the interface of dissimilar materials; the actual overlap length of the mesh fabric often falls short of design standards, leading to structural cracks in the smoke duct system under thermal cycling conditions, particularly at the junction of the L-shaped component and the wall, where smoke leakage is likely to occur.

[0101] This invention addresses the aforementioned technical problems by incorporating inverted trapezoidal ribs on the inner side of an aluminum mold with a slurry extrusion port. The inverted trapezoidal rib design increases the contact area between the aluminum mold and the cement mortar, thereby improving the interfacial bonding strength and reducing stress concentration. Specifically, the shape of the inverted trapezoidal ribs allows the cement mortar to better fill the space inside the aluminum mold during the hardening process, forming a tighter bond and effectively preventing flue gas leakage.

[0102] In this embodiment, the inverted trapezoidal ribs are precisely cut using a CNC machine tool during the aluminum mold processing, ensuring that the dimensions and positions of the ribs meet the design requirements. The height and width of the ribs can be adjusted according to actual construction needs to achieve the best bonding effect. As a preferred embodiment, the height of the ribs can be set to 5mm and the width can be set to 10mm.

[0103] By incorporating inverted trapezoidal ribs on the inner side of the aluminum mold with the grouting outlet, this application effectively solves the problems of structural cracks and flue gas leakage in existing flue systems under thermal cycling conditions. Compared with traditional processes, the technical solution of this application can significantly improve the bonding strength between the flue and the building structure, reduce stress concentration, and thus improve the overall sealing performance and durability of the flue system.

[0104] This invention ensures construction precision through BIM pre-visualization and positioning layout. The precise location of the grouting nozzle and effective monitoring by pressure sensors are ensured through the fabrication, pre-embedding, and calibration of aluminum molds with grouting nozzles. Dynamic adjustment of the support components ensures uniform gap between the flue and the support surface. The density of the sealing layer is ensured through sealing layer construction and ultrasonic testing. The stability of the sealing layer is ensured through the installation of bidirectional tensioners. Engineering inspection ensures the accuracy and traceability of the construction results.

[0105] BIM pre-simulation and positioning layout involves creating a BIM model of the L-shaped flue and main structure using Revit, generating an optimized layout drawing of the grouting inlets, and marking the cutting boundaries of the grouting inlets on the aluminum formwork surface. The aluminum formwork with grouting inlets is fabricated according to the BIM drawings, with triangular grouting inlets and guide grooves installed on the outside. Aluminum formwork pre-embedding and calibration involves installing the aluminum formwork with grouting inlets, pre-embedding pressure sensors within the grouting inlets, and connecting the pressure sensors to a monitoring terminal.

[0106] Dynamic adjustment of the support component involves installing a support component with X, Y, and Z-axis telescopic adjustment. When tightening, first tighten the X and Y axes, leaving room for Z-axis adjustment. Adjust the Z-axis according to the pre-compensation amount calculated by BIM to make the gap between the support component and the flue contact surface uniform.

[0107] The support components include a support body, X / Y axis slide rail modules, Z axis telescopic rods, and contact plates. The X / Y axis slide rail modules adopt a bidirectional ball screw structure, driven by a servo motor. The X / Y slide rail surface of the bidirectional ball screw structure is equipped with a scale for easy manual calibration.

[0108] The Z-axis telescopic rod adopts a hydraulic telescopic rod (stroke 0-100mm, load capacity ≥500kg). The top of the hydraulic telescopic rod is equipped with a ball joint to adapt to the curved surface of the flue, and the bottom is fixedly connected to the X / Y slide rail through a flange. The Z-axis telescopic rod adopts a top-mounted ball joint to adapt to the curved surface of the flue, and the bottom is rigidly connected to the X / Y slide rail.

[0109] The basic frame is fixed to the base plate of the X / Y slide rail module via flange connection. An optical target is preset on the basic frame. The level of the X / Y slide rail is calibrated by a total station and aligned with the flue positioning coordinates in the BIM model.

[0110] The contact panel is connected to the base frame via a spring preload mechanism, allowing for direct and flexible contact with the outer wall of the flue, ensuring even pressure distribution. The spring preload mechanism uses springs, and the surface of the contact panel is equipped with an anti-slip layer to increase friction and prevent the flue from sliding due to thermal displacement.

[0111] Multiple pressure sensors are provided, including pressure sensor one. Pressure sensor one is installed in the spring preload mechanism at the four corners of the contact panel and is installed in parallel with the laser rangefinder sensor. It is used to monitor the pressure distribution on the contact surface between the flue and the support in real time. The load data is fed back through pressure sensor one to trigger the Z-axis compensation action.

[0112] This includes pressure sensor two, which is added between the bottom flange of the hydraulic telescopic rod and the moving slider of the X / Y slide rail to monitor the load pressure of the hydraulic telescopic rod and prevent damage from overpressure.

[0113] Use a total station to align the optical target on the frame with the pre-embedded positioning point in the BIM model. If the deviation is greater than 0.5mm, it needs to be readjusted.

[0114] After the contact panel is installed, a laser rangefinder sensor monitors the gap between the flue and the panel in real time, and the data is fed back to the control terminal to adjust the Z-axis telescopic rod accordingly.

[0115] The control terminal is used to control the sliding of the X / Y slide rail module and the extension and retraction of the Z-axis telescopic rod. The servo motor of the X / Y slide rail drives the ball screw, which drives the Z-axis hydraulic column to move as a whole, forming a three-degree-of-freedom adjustment capability.

[0116] The control terminal uses a PLC, and the control method for the support component is as follows:

[0117] 1. Initialization calibration: The BIM model coordinates are automatically loaded upon startup, and the base frame and flue reference position are calibrated using a total station. At this time, the control terminal needs to read the data from the total station and optical target.

[0118] 2. Sensor data acquisition: Real-time reading of data from the pressure sensor and laser rangefinder (0-10mm) at the four corners of the contact panel;

[0119] 3. Data Processing and Judgment: Analyze the obtained data to determine the uniformity of pressure distribution and flue clearance, and then adjust the system using a PLC control module (algorithm: PID control).

[0120] 4. Issuance of instructions:

[0121] If the data exceeds the limit:

[0122] Uneven pressure: Triggers Z-axis hydraulic column compensation

[0123] Gap exceeds tolerance: Drive X / Y slide rail

[0124] Adjustment is achieved by controlling the extension and retraction of a servo motor and hydraulic rod.

[0125] 5. Dynamic Adjustment Verification: After adjustment, re-collect sensor data. If the limits are still exceeded, repeat steps 3-4 until the threshold is met.

[0126] The sealing layer is formed by injecting cement mortar into the guide channel to create a sealing layer, which is then adjusted to a predetermined MPa value range based on feedback from the pressure sensor.

[0127] After the mortar has initially set, an ultrasonic flaw detector is used to spirally scan along the mortar extrusion port to generate a density cloud map.

[0128] Engineering inspection involves using a 3D laser scanner to compare with the BIM model and an infrared thermal imager to scan the joints. Sensor data and scan reports are uploaded to a digital management platform to generate QR code traceability labels.

[0129] Through the above steps, this application effectively solves the problem of the difference in the coefficient of thermal expansion between the L-shaped flue components and the main building structure, avoiding the formation of microcracks under cyclic temperature stress. Simultaneously, the layered filling method and the installation of bidirectional tensioners resolve the stress concentration problem at the interface of heterogeneous materials, preventing structural cracks in the flue system under thermal cycling conditions, and particularly preventing flue gas leakage at the junction of the L-shaped components and the wall.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for installing an L-shaped flue to prevent smoke leakage, characterized in that: The construction steps include the following: Step 1, BIM Pre-visualization and Positioning: Use Revit to create an L-shaped flue and main structure BIM model, and generate an optimized layout drawing of the grouting port; mark the grouting port cutting boundary on the aluminum formwork surface; Step 2, Aluminum mold processing with extrusion nozzle: Process the triangular extrusion nozzle according to the BIM drawings, and set the guide groove on the outside of the extrusion nozzle; Step 3, Aluminum Mold Pre-embedding and Calibration: Install the aluminum mold with the slurry extrusion port, pre-embed a pressure sensor inside the extrusion port, and connect the pressure sensor to the monitoring terminal; Step 4, flue installation; Step 5, Dynamic adjustment of the support component: When installing a support component with X, Y, and Z-axis telescopic adjustment, tighten the X and Y axes first, leaving room for Z-axis adjustment. Based on the pre-compensation amount calculated by BIM, Z-axis adjustment is performed to make the gap between the support and the flue contact surface uniform. Step 6, Seal layer construction: Cement mortar is injected through a guide channel to form a sealing layer, and the pressure is adjusted to a predetermined MPa value range based on feedback from the pressure sensor. After the mortar has initially set, an ultrasonic flaw detector is used to spirally scan along the mortar extrusion port to generate a density cloud map. Step 7: Install the bidirectional tensioner on the sealing layer; Step 8, Engineering Inspection: Geometric accuracy: A 3D laser scanner is used to compare the BIM model, and an infrared thermal imager is used to scan the seams; Data archiving: Upload sensor data and scanning reports to the digital management platform to generate QR code traceability labels; Step 7 includes the following steps: Step 71: Apply an interface agent to the surface of the sealing layer; Step 72: Install the bidirectional tensioner when the surface is dry to the touch and no longer sticky. In step 72, the bidirectional tensioner includes a transverse clamp, and the transverse tensioning steps of the transverse clamp are as follows: Step 721, Initial Tensioning Install transverse clamps symmetrically from the center of the mesh fabric to both sides, start the hydraulic pump to apply tension to the predetermined tension range, and simultaneously monitor the gap between the mesh fabric and the base surface. If wrinkles are found, stop immediately and adjust the position of the clamps. Step 722, Tension Locking: After reaching the target tension range, use a self-locking anchor to fix the end of the transverse clamp; In step 72, the bidirectional tensioner includes a longitudinal clamp, and the longitudinal tensioning steps of the longitudinal clamp are as follows: Step 723: Install the longitudinal clamp along the length of the mesh fabric and apply the load in two stages: First stage: Tension 0.8 kN / m, hold for 10 seconds to eliminate initial relaxation; Second stage: Tension 1.0kN / m, held for 20 seconds to complete plastic deformation compensation; Step 724, Tension monitoring: Use a displacement sensor to monitor the elongation of the mesh fabric.

2. The method for installing and constructing an L-shaped flue to prevent smoke leakage according to claim 1, characterized in that: In step 4, the flue installation includes the following steps: Step 41, Initial Positioning: Hoist the flue to the predetermined position and use a rangefinder to ensure that the distance between it and the slurry extrusion port is in a suitable position; Step 42, Hydraulic jacking: Start the diagonal jacking device to advance the flue, and simultaneously activate the lateral fine-tuning device to correct the offset in real time based on the feedback from the displacement sensor; Step 43, Segmented Extrusion: First stage: Push the mortar to 30% of the design displacement, pause for a certain period of time to allow the mortar to initially level; Second stage: Push to 70% of the design displacement, pause for a certain period of time to carry out ultrasonic flaw detection, and start the grouting pump when the cavity rate is greater than 1%. Third stage: Push to 100% of the design displacement, maintain pressure for 1 minute, and then lock the hydraulic cylinder.

3. The method for installing and constructing an L-shaped flue to prevent smoke leakage according to claim 1, characterized in that: During the lateral tensioning process, an infrared device is used to irradiate the surface of the mesh fabric at an angle. After preheating to 60°C, the clamps are locked. During the vertical tensioning process, the vertical tensioning and heating are synchronized with the infrared device. First stage heating: 0.8kN / m vertical tension is eliminated and relaxed, and infrared heating is used to raise the temperature to 80℃ to maintain fiber extensibility; Second stage heating: 1.0kN / m to compensate for plastic deformation, infrared heating to 90℃ to complete heat setting.

4. The method for installing and constructing an L-shaped flue to prevent smoke leakage according to claim 3, characterized in that: During the heating process, an infrared thermometer is used to provide real-time feedback on surface temperature fluctuations.

5. The method for installing and constructing an L-shaped flue to prevent smoke leakage according to claim 1, characterized in that: In step 2, the slurry outlet is designed as an asymmetrical triangular cavity.

6. The method for installing and constructing an L-shaped flue to prevent smoke leakage according to claim 1, characterized in that: Step 7: During the engineering inspection, a sealing test is conducted. Both ends of the flue are sealed, compressed air is injected, and the pressure drop rate is measured within a specified time to determine whether it is qualified.

7. The method for installing and constructing an L-shaped flue to prevent smoke leakage according to claim 1, characterized in that: The inner side of the aluminum mold with the slurry extrusion port is provided with an inverted trapezoidal rib.

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