Smoke leakage prevention installation and construction method for L-shaped flue

Abstract

The invention discloses an L-shaped flue smoke leakage prevention installation construction method which comprises the following steps: simulating thermal displacement through BIM modeling in combination with meteorological data, optimizing the layout of a shoving port and marking the cutting boundary of an aluminum mold; manufacturing a triangular shoving port aluminum mold with a diversion trench, pre-burying a pressure sensor and connecting a monitoring system; a multidirectional dynamic bearing piece is installed, and the contact surface gap is adjusted based on the pre-compensation amount; a sealing layer is formed through flow guide groove grouting, the grouting pressure is controlled according to real-time data of a pressure sensor, and a compactness cloud picture is generated through ultrasonic flaw detection after initial setting; after the two-way tensioning device is installed, a three-dimensional laser scanner is used for comparing geometric accuracy with a BIM model, a thermal infrared imager is combined for detecting a seam, and finally data are integrated through a digital platform to generate a tracing label. According to the method, through thermal displacement pre-compensation design, a dynamic adjusting mechanism, pressure feedback grouting and a multi-mode detection system, the problems of positioning deviation, untight sealing and smoke leakage in traditional construction are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an L-shaped flue anti-smoke leakage installation construction method. Background Art

[0002] The installation process of smoke exhaust ducts in existing buildings usually adopts the following technical solutions: First, re-measure the geometric dimensions and axis positioning of the reserved holes on each floor of the building to ensure that the verticality deviation of the holes on the upper and lower floors meets the requirements of the specifications. Before construction, it is necessary to remove the attachments around the reserved holes, including scum, construction waste and other obstacles that affect the installation accuracy. For the joints between L-shaped prefabricated components and walls, the traditional process uses a layered filling method for treatment: the first layer of polymer cement mortar is filled to 2 / 3 of the joint depth, and the second filling layer is required to complete the remaining 1 / 3 of the space. At the same time, an alkali-resistant glass fiber mesh cloth needs to be laid at the inner corner, and the design value of the mesh cloth overlap length is not less than 100mm.

[0003] However, the existing technology has significant defects: 1) There is a significant difference in the thermal expansion coefficient of the L-shaped flue component and the main body of the building, which is prone to microcracks under the action of periodic temperature stress; 2) The layered filling process fails to effectively solve the stress concentration problem at the interface of heterogeneous materials; 3) Due to the limitations of construction conditions, the actual overlap length of the mesh cloth is often difficult to meet the design standards. These problems lead to structural cracks in the flue system under thermal cycle conditions, especially at the junction of the L-shaped component and the wall, which is prone to smoke leakage, resulting in a decrease in indoor air quality and functional defects in the residence in severe cases.

[0004] Therefore, there is an urgent need for an L-shaped flue anti-smoke leakage installation and construction method that can make the gap dense without affecting the delivery effect and effectively solve the problem of smoke leakage in the later stage. Summary of the invention

[0005] In view of this, the present invention provides an L-shaped flue anti-smoke leakage installation and construction method, which makes the gap dense without affecting the delivery effect, and effectively solves the problem of smoke leakage in the later stage.

[0006] The invention provides an L-shaped flue anti-smoke leakage installation construction method adopting the following technical scheme:

[0007] An L-shaped flue anti-smoke leakage installation construction method includes the following construction steps:

[0008] Step 1, BIM preview and positioning: Use Revit to build the BIM model of the L-shaped flue and the main structure, input local meteorological data (extreme high temperature / low temperature, temperature difference change rate); run thermal displacement simulation analysis (ANSYS Thermal module) to generate the optimized layout diagram of the slurry extrusion port; mark the cutting boundary of the slurry extrusion port on the surface of the aluminum mold;

[0009] Step 2: Processing of aluminum mold with slurry extrusion port: Processing of triangular slurry extrusion port according to BIM drawing, and setting of guide groove outside of the slurry extrusion port;

[0010] Step 3, pre-embedding and calibration of aluminum mold: installing an aluminum mold with a slurry extrusion port, pre-embedding a pressure sensor in the slurry extrusion port, and connecting the pressure sensor to the monitoring terminal;

[0011] Step 4, flue installation;

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

[0013] Install the supporting parts with telescopic adjustment in X, Y and Z directions. When tightening, tighten the X and Y directions first, leaving room for adjustment in the Z direction;

[0014] Perform Z-direction adjustment based on the pre-compensation amount calculated by BIM to make the gap between the supporting part and the contact surface of the flue uniform.

[0015] Step 6, sealing layer construction:

[0016] Cement mortar is injected through the diversion groove to form a plugging layer, and the pressure sensor is fed back to the predetermined MPa value range; after the mortar is initially set, an ultrasonic flaw detector is used to spirally scan along the slurry extrusion port to generate a density cloud map;

[0017] Step 7, installing a bidirectional tensioner on the sealing layer;

[0018] Step 8, engineering inspection:

[0019] Geometric accuracy: Use 3D laser scanner to compare BIM model and infrared thermal imager to scan joints;

[0020] Data archiving: Upload sensor data and scan reports to the digital management platform and 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 a predetermined position, and use a distance meter to ensure that the distance from the slurry extrusion port is at a suitable position;

[0023] Step 42, hydraulic jacking: start the diagonal jacking device to push the flue, and simultaneously start the lateral fine-tuning device to correct the offset in real time according to the feedback from the displacement sensor;

[0024] Step 43, segmented extrusion:

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

[0026] The second stage: Push to 70% of the designed displacement, pause for a certain period of time to conduct ultrasonic flaw detection (start the grouting pump when the cavity rate is greater than 1%);

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

[0028] Optionally, in step 7, the following steps are included:

[0029] Step 71, applying an interface agent on the surface of the plugging layer;

[0030] Step 72, when the surface is dry and not sticky to the touch, install the bidirectional tensioner.

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

[0032] Step 721, initial tension

[0033] Install transverse clamps symmetrically from the center of the mesh cloth 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, and simultaneously monitor the gap between the mesh cloth and the base surface. If wrinkles are found, pause immediately and adjust the clamp position.

[0034] Step 722, tension locking: after reaching the target tension range, a self-locking anchor is used to fix the end of the transverse clamp.

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

[0036] Step 723, install the longitudinal fixture along the length direction of the mesh cloth, and load it in two stages:

[0037] Stage 1: Tension 0.8 kN / m, maintained for 10 seconds to eliminate initial relaxation;

[0038] The second stage: tension 1.0kN / m, maintained for 20 seconds to complete plastic deformation compensation;

[0039] Step 724, tension monitoring: using a displacement sensor to monitor the extension of the mesh cloth.

[0040] Optionally, during the horizontal tensioning process, infrared equipment is used to radiate the mesh surface obliquely, and the clamp is locked after the preheating temperature reaches 60°C. During the vertical tensioning process, the vertical tensioning and infrared equipment are heated synchronously.

[0041] First stage heating: 0.8kN / m vertical tension eliminates relaxation, infrared heating to 80℃ maintains fiber ductility;

[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 is used to provide real-time feedback of surface temperature fluctuations.

[0044] Optionally, in step 2, the slurry extrusion port is designed as an asymmetric triangular cavity.

[0045] Optionally, in step 7, during the engineering inspection, a sealing test is performed by sealing both ends of the flue, injecting compressed air, and detecting the pressure reduction rate within a specified time to determine whether it is qualified.

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

[0047] In summary, the present invention includes at least one of the following beneficial technical effects: including BIM preview and positioning layout, aluminum mold processing with slurry extrusion port, aluminum mold pre-embedding and calibration, flue installation, dynamic adjustment of supporting parts, sealing layer construction, installation of bidirectional tensioner and engineering detection steps. Through precise preview and positioning layout, complex slurry extrusion port design, dynamic adjustment mechanism, real-time monitoring and quality control means and comprehensive engineering detection means, the problems of positioning error, installation deviation, incomplete sealing and smoke leakage in the prior art are effectively solved. It has the advantages of improving installation accuracy, enhancing sealing effect, adapting to temperature changes, realizing real-time monitoring and quality control, and comprehensively detecting leakage prevention effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a construction flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following is combined with Figure 1 The present invention is described in further detail.

[0050] The embodiment of the present invention discloses an installation and construction method for preventing smoke leakage of an L-shaped flue.

[0051] Reference Figure 1 , an L-shaped flue anti-smoke leakage installation construction method, comprising the following construction steps:

[0052] Step 1, BIM preview and positioning: Use Revit to build the BIM model of the L-shaped flue and the main structure, input local meteorological data (extreme high / low temperatures and temperature difference change rate in the past five years); run thermal displacement simulation analysis (ANSYS Thermal module) to generate the optimized layout diagram of the slurry extrusion port; mark the cutting boundary of the slurry extrusion port on the surface of the aluminum mold;

[0053] Step 2: Processing of aluminum mold with slurry extrusion port: Processing of triangular slurry extrusion port according to BIM drawing, and setting of guide groove outside of the slurry extrusion port;

[0054] Step 3, pre-embedding and calibration of aluminum mold: installing an aluminum mold with a slurry extrusion port, pre-embedding a pressure sensor in the slurry extrusion port, and connecting the pressure sensor to the monitoring terminal;

[0055] Step 4, flue installation;

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

[0057] Install the supporting parts with telescopic adjustment in X, Y and Z directions. When tightening, tighten the X and Y directions first, leaving room for adjustment in the Z direction;

[0058] Perform Z-direction adjustment based on the pre-compensation amount calculated by BIM to make the gap between the supporting part and the contact surface of the flue uniform.

[0059] Step 6, sealing layer construction:

[0060] Cement mortar is injected through the diversion groove to form a plugging layer, and the pressure sensor is fed back to the predetermined MPa value range; after the mortar is initially set, an ultrasonic flaw detector is used to spirally scan along the slurry extrusion port to generate a density cloud map;

[0061] Step 7, installing a bidirectional tensioner on the sealing layer;

[0062] Step 8, engineering inspection:

[0063] Geometric accuracy: Use 3D laser scanner to compare BIM model, and infrared thermal imager to scan joints;

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

[0065] Through precise rehearsal and positioning layout, complex slurry extrusion port design, dynamic adjustment mechanism, real-time monitoring and quality control means and comprehensive engineering detection means, the problems of positioning error, installation deviation, incomplete sealing and smoke leakage in the existing technology are effectively solved. It has the advantages of improving installation accuracy, enhancing sealing effect, adapting to temperature changes, realizing real-time monitoring and quality control, and comprehensively detecting leakage prevention effects.

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

[0067] Initial positioning: hoist the flue to the predetermined position, and use the distance meter to ensure that the distance from the slurry extrusion port is in the appropriate position. Hydraulic jacking: start the diagonal jacking device to advance the flue, and simultaneously open the lateral fine-tuning device to correct the offset in real time according to the feedback of the displacement sensor. Segmented extrusion: in the first stage, push to 30% of the designed displacement, pause for a certain time to allow the mortar to initially level; in the second stage, push to 70% of the designed displacement, pause for a certain time to perform ultrasonic testing, and start the slurry pump when the cavity rate is greater than 1%; in the third stage, push to 100% of the designed displacement, maintain the 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 the micro-cracks caused by the difference in thermal expansion coefficients between the L-shaped flue components and the main building materials, the failure of the layered filling process to effectively solve the stress concentration problem at the interface of heterogeneous materials, and the difficulty of the actual overlap length of the mesh cloth to meet the design standards. 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 density of the mortar at the joints, thereby effectively avoiding structural cracks and smoke leakage problems.

[0069] Specifically, the initial positioning step uses a distance meter to ensure the accuracy of the distance between the flue and the slurry extrusion port, the hydraulic jacking step uses a diagonal jack and a lateral fine-tuning device to achieve precise advancement and real-time correction of the flue, and the segmented extrusion step uses staged jacking and pauses to make the mortar evenly leveled at different stages, and ultrasonic flaw detection and grouting pumps are used to further ensure the density of the joints. As a result, 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 interface agent on the surface of the sealing layer, and install the bidirectional tensioner when the surface is dry and not sticky to the touch.

[0071] Specifically, in step 7, firstly, a layer of interface agent is evenly applied on the surface of the plugging layer. The function of the interface agent is to enhance the bonding force between the plugging layer and the bidirectional tensioner, and ensure that the bidirectional tensioner installed later can be firmly attached to the surface of the plugging layer. After applying the interface agent, it is necessary to wait for the surface to dry to a non-sticky state to avoid the problem of poor bonding caused by installing the bidirectional tensioner when the interface agent is not completely dry.

[0072] The installation steps of the bidirectional tensioner include transverse tensioning and longitudinal tensioning. When transverse tensioning, install transverse clamps symmetrically from the center of the mesh cloth to both sides, start the hydraulic pump to apply tension at a specific rate to the predetermined tension range, and continue for a specific time, and simultaneously monitor the gap between the mesh cloth and the base surface. If wrinkles are found, immediately pause and adjust the clamp position. After reaching the target tension range, use a self-locking anchor to fix the end of the transverse clamp.

[0073] When tensioning longitudinally, a longitudinal clamp is installed along the length of the mesh cloth, and loading is performed in two stages: the first stage tension is 0.8 kN / m, which is maintained for 10 seconds to eliminate initial relaxation; the second stage tension is 1.0 kN / m, which is maintained for 20 seconds to complete plastic deformation compensation. A displacement sensor is used to monitor the extension of the mesh cloth to ensure that the tensioning effect is as expected.

[0074] This application solves the problems of weak adhesion and poor tensioning effect in traditional processes by applying an interface agent on the surface of the plugging layer and installing a bidirectional tensioner when the surface is dry and non-sticky. Through reasonable tensioning steps and monitoring methods, the density and adhesion between the mesh cloth and the base surface are ensured, thereby effectively preventing structural cracks and smoke leakage problems in the flue system under thermal cycle conditions.

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

[0076] Initial tensioning: Install transverse clamps symmetrically from the center of the mesh cloth 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, while simultaneously monitoring the gap between the mesh cloth and the base surface. If wrinkles are found, pause immediately and adjust the clamp position.

[0077] Tension Lock: 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 that the traditional process fails to effectively solve the stress concentration problem at the interface of heterogeneous materials during the installation and construction of L-shaped flue anti-leakage, resulting in structural cracks in the flue system under thermal cycle conditions. By installing a bidirectional tensioner on the plugging layer, the gap between the mesh cloth and the base surface is uniform, avoiding the problem of poor sealing caused by wrinkles.

[0079] Specifically, in the initial tensioning stage, the transverse clamps are installed symmetrically from the center of the mesh to both sides, and the hydraulic pump is started to apply tension at a specific rate to the predetermined tension range for a specific time. During this process, the gap between the mesh and the base surface is monitored synchronously. If wrinkles are found, the clamp position is immediately paused and adjusted to ensure the uniformity and stability of the tensioning effect. After reaching the target tension range, the end of the transverse clamp is fixed with a self-locking anchor to ensure the durability and reliability of the tension.

[0080] Therefore, the present 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, and the longitudinal tensioning steps of the longitudinal clamp are as follows: the longitudinal clamp is installed along the length direction of the mesh cloth, and loaded in two stages: the first stage: the tension is 0.8kN / m, maintained for 10 seconds to eliminate the initial relaxation; the second stage: the tension is 1.0kN / m, maintained for 20 seconds to complete the plastic deformation compensation; tensioning monitoring: use a displacement sensor to monitor the extension of the mesh cloth.

[0082] The present invention adopts a staged loading method in the longitudinal tensioning process of the bidirectional tensioner. In the first stage, a tension of 0.8 kN / m is applied and maintained for 10 seconds to eliminate the initial relaxation of the mesh cloth; in the second stage, a tension of 1.0 kN / m is applied and maintained for 20 seconds to complete the plastic deformation compensation. In addition, a displacement sensor is used to monitor the extension of the mesh cloth to ensure the accuracy and reliability of the tensioning process.

[0083] During the longitudinal tensioning process, the staged loading method can effectively eliminate the initial relaxation of the mesh and ensure the close fit of the mesh through plastic deformation compensation. This method not only improves the tensioning effect of the mesh, but also effectively avoids the problem of insufficient tension caused by initial relaxation. Using a displacement sensor to monitor the extension of the mesh can obtain data in real time during the tensioning process to ensure the accuracy and reliability of the tensioning process.

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

[0085] Based on the longitudinal tensioning method of the bidirectional tensioner, the problems of poor tensioning effect and insufficient tension in the prior art are effectively solved by loading in stages and using a displacement sensor to monitor the extension of the mesh cloth. Compared with the prior art, the method of the present application can ensure the close fit of the mesh cloth, improve the sealing and structural stability of the L-shaped flue, and further avoid the problem of smoke leakage, thereby improving the overall air quality and service life of the building.

[0086] During the transverse tensioning process, infrared equipment is used to radiate the surface of the mesh cloth at an angle. The clamp is locked after the preheating temperature reaches 60°C. During the vertical tensioning process, the vertical tensioning and infrared equipment are heated simultaneously. The first stage of heating: 0.8kN / m vertical tension eliminates relaxation, and the infrared temperature is raised to 80°C to maintain fiber ductility; the second stage of heating: 1.0kN / m compensates for plastic deformation, and the infrared temperature is raised to 90°C to complete heat setting.

[0087] Infrared equipment is used to preheat the surface of the mesh cloth. Specifically, during the horizontal tensioning process, the infrared equipment is used to radiate the surface of the mesh cloth at a 45° angle, so that the preheating temperature reaches 60°C, and then the clamp is locked to ensure that the mesh cloth maintains an appropriate temperature during the tensioning process, thereby improving its ductility and tensioning effect. During the vertical tensioning process, the infrared equipment is heated synchronously, which is divided into two stages: in the first stage, under the vertical tension of 0.8kN / m, the infrared equipment raises the temperature to 80°C to eliminate the relaxation of the mesh cloth; in the second stage, under the vertical tension of 1.0kN / m, the infrared equipment raises the temperature to 90°C to complete the plastic deformation compensation and heat setting of the mesh cloth.

[0088] Heating the mesh cloth with infrared equipment can effectively improve the ductility and strength of the mesh cloth during the tensioning process, thereby ensuring the stability and reliability of the tensioning effect. Specifically, the infrared heating process is divided into two stages, and the temperature is controlled under different tensions to ensure the performance optimization of the mesh cloth at different stages. The first stage of heating is mainly to eliminate the initial relaxation of the mesh cloth, while the second stage of heating is to complete the plastic deformation compensation and heat setting of the mesh cloth. Therefore, the infrared heating process can effectively improve the tensioning effect of the mesh cloth and avoid the problem of unstable performance caused by temperature changes.

[0089] By using infrared equipment for heating during the horizontal and vertical tensioning process, the problem of insufficient ductility of the mesh cloth and unstable tensioning effect in the traditional construction method is solved. Compared with the prior art, the technical solution of the present application can improve the ductility and tensioning effect of the mesh cloth without affecting the construction efficiency, thereby ensuring the overall quality and reliability of the installation and construction of the L-shaped flue anti-leakage smoke.

[0090] During the heating process, infrared thermometers are used to provide real-time feedback of surface temperature fluctuations. By using infrared thermometers to monitor surface temperature fluctuations in real time during the heating process, the uniformity and stability of temperature are ensured. This process helps prevent changes in material properties caused by uneven temperature, thereby improving construction quality and reliability. Infrared thermometers can quickly and accurately feedback temperature information, allowing operators to adjust heating equipment in a timely manner to ensure that the temperature is controlled within the predetermined range.

[0091] This real-time temperature monitoring method is achieved by establishing a data connection between the infrared thermometer's probe and the heating device. The probe continuously collects surface temperature data and transmits the data to the control terminal. The control terminal automatically adjusts the output power of the heating device according to the preset temperature fluctuation range to maintain the surface temperature stable. For example, when the probe detects that the surface temperature exceeds the preset 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] In this way, the problem of material performance degradation caused by excessive temperature fluctuations can be effectively avoided, ensuring the stability and consistency of the construction process.

[0093] By introducing the technical means of infrared thermometer to feedback the surface temperature fluctuation in real time, the problem of inaccurate temperature control in the prior art is effectively solved, the construction quality and reliability are improved, and the sealing and stability of the flue system are ensured. Compared with the prior art, the present invention has significant advantages in temperature control and can better meet the requirements of high-quality construction.

[0094] In step 2, the slurry extrusion port is designed as an asymmetric triangular cavity. In the technical solution of the present application, step 2 is performed by processing the triangular slurry extrusion port according to the BIM drawing, and setting a guide groove outside the slurry extrusion port. The slurry extrusion port designed with an asymmetric triangular cavity can make the cement mortar more evenly distributed during the injection process, avoiding the problem of mortar accumulation or poor flow that may be caused by the traditional symmetrical design. As a result, the asymmetric triangular cavity improves the density and uniformity of the mortar to a certain extent, and further enhances the anti-leakage performance of the sealing layer.

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

[0096] This technical solution effectively solves the problems of poor flow and accumulation that may occur during mortar injection in traditional symmetrical designs through the design of the slurry extrusion port in an asymmetric triangular cavity. Compared with the prior art, the solution of this application improves the density and uniformity of the mortar, thereby enhancing the anti-leakage performance of the sealing layer, further ensuring the close connection between the L-shaped flue and the main structure, and solving the problems of microcracks and smoke leakage caused by temperature stress.

[0097] During the engineering inspection, a sealing test is carried out. The two ends of the flue are closed, compressed air is injected, and the pressure reduction rate is tested within the specified time to determine whether it is qualified.

[0098] In order to ensure the sealing of the L-shaped flue after installation, this application adopts the method of compressed air detection. Specifically, after the flue is installed and initially sealed, both ends of the flue are closed and compressed air is injected to increase the pressure inside the flue. Then, the pressure change in the flue is monitored within a specified time. If the pressure reduction rate is within the allowable range, it means that the flue is sealed; otherwise, further processing and adjustment of the sealing measures are required.

[0099] This method can effectively detect the sealing performance of the flue and ensure that the flue will not leak smoke during use. By injecting and detecting compressed air, the sealing effect of the flue can be quickly and accurately judged, avoiding the subjective judgment error that may exist in the traditional method. The method of the present invention is more accurate, can effectively improve the sealing performance of the flue, and avoid the impact of smoke leakage on indoor air quality and residential functionality.

[0100] An inverted trapezoidal convex rib is set on the inner side of the aluminum mold with a slurry extrusion port. In the existing building exhaust pipe installation process, there is a significant difference in the material thermal expansion coefficient between the L-shaped flue component and the main body of the building, which is prone to microcracks under the action of periodic temperature stress. In addition, the traditional layered filling process fails to effectively solve the stress concentration problem at the interface of heterogeneous materials. The actual overlap length of the mesh cloth is often difficult to meet the design standard, resulting in structural cracks in the flue system under thermal cycle conditions, especially at the junction of the L-shaped component and the wall, which is prone to smoke leakage.

[0101] The present invention aims to solve the above technical problems by arranging inverted trapezoidal convex ribs on the inner side of the aluminum mold with a slurry extrusion port. The design of the inverted trapezoidal convex ribs can increase the contact area between the aluminum mold and the cement mortar, thereby improving the bonding strength of the interface and reducing the stress concentration phenomenon. Specifically, the shape of the inverted trapezoidal convex ribs enables the cement mortar to better fill the space inside the aluminum mold during the hardening process, forming a tighter bond and effectively preventing smoke leakage.

[0102] In this embodiment, the inverted trapezoidal ribs are precisely cut by a CNC machine tool during the processing of the aluminum mold to ensure that the size and position 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 5 mm and the width can be set to 10 mm.

[0103] By setting an inverted trapezoidal convex rib on the inner side of the aluminum mold with a slurry extrusion port, the present application can effectively solve the problem of structural cracks and smoke leakage in the flue system under thermal cycle conditions in the prior art. Compared with the traditional process, the technical solution of the present application can significantly improve the bonding strength between the flue and the main building, reduce stress concentration, and thus improve the overall sealing performance and durability of the flue system.

[0104] The invention ensures the accuracy of construction through BIM preview and positioning and setting out. The accurate position of the slurry extrusion port and the effective monitoring of the pressure sensor are ensured through the processing, pre-embedding and calibration of the aluminum mold with the slurry extrusion port. The uniform gap between the contact surface of the flue and the supporting member is ensured through the dynamic adjustment of the supporting member. The density of the sealing layer is ensured through the construction of the sealing layer and ultrasonic flaw detection. The stability of the sealing layer is ensured through the installation of the bidirectional tensioner. The accuracy and traceability of the construction effect are ensured through engineering testing.

[0105] BIM preview and positioning layout is to establish the BIM model of the L-shaped flue and the main structure through Revit, input local meteorological data, run thermal displacement simulation analysis, generate the optimized layout diagram of the slurry extrusion port, and mark the cutting boundary of the slurry extrusion port on the surface of the aluminum mold. The processing of the aluminum mold with a slurry extrusion port is to process the triangular slurry extrusion port according to the BIM drawing, and set the guide groove outside the slurry extrusion port. The pre-embedding and calibration of the aluminum mold is to install the aluminum mold with a slurry extrusion port, pre-embed the pressure sensor in the slurry extrusion port, and connect the pressure sensor to the monitoring terminal.

[0106] Dynamic adjustment of supporting parts is to install supporting parts with telescopic adjustment in X, Y and Z directions. When tightening, first tighten in X and Y directions, leave adjustment margin in Z direction, and adjust in Z direction according to the pre-compensation amount calculated by BIM to make the gap between the supporting part and the contact surface of the flue uniform.

[0107] The supporting parts include the supporting body, X / Y slide rail module, Z telescopic rod and contact plate. The X / Y slide rail module adopts a bidirectional ball screw structure, which is driven by a servo motor. The surface of the X / Y slide rail of the bidirectional ball screw structure is set with a scale ruler to facilitate manual calibration.

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

[0109] The base frame is fixed to the base plate of the X / Y slide rail module through a flange connection. An optical target is preset on the base frame. The horizontality 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 through a spring preload mechanism, and is in direct and flexible contact with the outer wall of the flue to ensure uniform pressure distribution. The spring preload mechanism uses a spring, and the surface of the contact panel is provided with an anti-slip layer to increase friction and prevent the flue from sliding due to thermal displacement.

[0111] There are multiple pressure sensors, including pressure sensor 1. Pressure sensor 1 is arranged in the spring preload mechanism at the four corners of the touch panel and installed in parallel with the laser ranging sensor. It is used to monitor the pressure distribution on the contact surface between the flue and the supporting member in real time, and the load data is fed back by pressure sensor 1 to trigger the Z-direction compensation action.

[0112] Including pressure sensor 2, a pressure sensor is added between the bottom flange of the hydraulic telescopic rod and the moving slide block of the X / Y slide rail to monitor the load pressure of the hydraulic telescopic rod to prevent overpressure damage.

[0113] Use the total station to align the optical target on the frame and match it with the embedded positioning points in the BIM model. If the deviation is greater than 0.5mm, fine-tuning is required.

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

[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 telescopic rod. The servo motor of the X / Y slide rail drives the ball screw to drive the overall translation of the Z hydraulic column to form a three-degree-of-freedom adjustment capability.

[0116] The control terminal adopts PLC, and the control method of the supporting parts is as follows:

[0117] 1. Initialization calibration: Automatically load the BIM model coordinates at startup, and calibrate the base frame and flue reference position through the total station. At this time, the control terminal needs to read the data of the total station and optical target;

[0118] 2. Sensor data collection: real-time reading of the pressure sensor and laser distance sensor (0-10mm) at the four corners of the touch panel;

[0119] 3. Data processing and judgment: Analyze the pressure distribution uniformity and flue clearance through the obtained data, and adjust through the PLC control module (algorithm: PID adjustment)

[0120] 4. Instructions issued:

[0121] If the data exceeds the limit:

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

[0123] Gap tolerance: drive X / Y slide rail

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

[0125] 5. Dynamic adjustment verification: After adjustment, re-collect sensor data. If it still exceeds the limit, repeat steps 3-4 until the threshold is met.

[0126] The sealing layer is constructed by injecting cement mortar into the diversion groove to form a sealing layer, and the pressure sensor feedback is fed back to the predetermined MPa value range.

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

[0128] Engineering inspection uses a 3D laser scanner to compare the BIM model and an infrared thermal imager to scan the joints. The sensor data and scanning reports are uploaded to the digital management platform to generate a QR code traceability label.

[0129] Through the above steps, the present application effectively solves the problem of the difference in thermal expansion coefficients between the L-shaped flue component and the main body of the building, and avoids the generation of microcracks under the action of periodic temperature stress. At the same time, through the layered filling method and the installation of the bidirectional tensioner, the stress concentration problem at the interface of heterogeneous materials is solved, and the structural cracks in the flue system under thermal cycle conditions are avoided, especially the smoke leakage problem is avoided at the junction of the L-shaped component and the wall.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An L-shaped flue anti-smoke leakage installation construction method, characterized in that: The construction steps include: Step 1, BIM preview and positioning: Use Revit to build the BIM model of the L-shaped flue and the main structure, input local meteorological data (extreme high temperature / low temperature, temperature difference change rate); run thermal displacement simulation analysis (ANSYS Thermal module) to generate the optimized layout diagram of the slurry extrusion port; mark the cutting boundary of the slurry extrusion port on the surface of the aluminum mold; Step 2: Processing of aluminum mold with slurry extrusion port: Processing of triangular slurry extrusion port according to BIM drawing, and setting of guide groove outside of the slurry extrusion port; Step 3, pre-embedding and calibration of aluminum mold: installing an aluminum mold with a slurry extrusion port, pre-embedding a pressure sensor in the slurry extrusion port, and connecting the pressure sensor to the monitoring terminal; Step 4, flue installation; Step 5: Dynamic adjustment of the support: Install the supporting parts with telescopic adjustment in X, Y and Z directions. When tightening, tighten the X and Y directions first, leaving room for adjustment in the Z direction; Perform Z-direction adjustment based on the pre-compensation amount calculated by BIM to make the gap between the supporting part and the contact surface of the flue uniform. Step 6, sealing layer construction: Cement mortar is injected through the diversion groove to form a plugging layer, and the pressure sensor is fed back to the predetermined MPa value range; after the mortar is initially set, an ultrasonic flaw detector is used to spirally scan along the slurry extrusion port to generate a density cloud map; Step 7, installing a bidirectional tensioner on the sealing layer; Step 8, engineering inspection: Geometric accuracy: Use 3D laser scanner to compare BIM model, and infrared thermal imager to scan joints; Data archiving: Upload sensor data and scan reports to the digital management platform and generate QR code traceability labels.

2. The L-shaped flue anti-smoke leakage installation construction method 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 a predetermined position, and use a distance meter to ensure that the distance from the slurry extrusion port is at a suitable position; Step 42, hydraulic jacking: start the diagonal jacking device to push the flue, and simultaneously start the lateral fine-tuning device to correct the offset in real time according to the feedback from the displacement sensor; Step 43, segmented extrusion: The first stage: Push to 30% of the designed displacement, and pause for a certain period of time to allow the mortar to initially level; The second stage: Push to 70% of the designed displacement, pause for a certain period of time to conduct ultrasonic flaw detection (start the grouting pump when the cavity rate is greater than 1%); The third stage: Push to 100% of the designed displacement, maintain the pressure for 1 minute and then lock the hydraulic cylinder.

3. The L-shaped flue anti-smoke leakage installation construction method according to claim 1, characterized in that: In step 7, the following steps are included: Step 71, applying an interface agent on the surface of the plugging layer; Step 72, when the surface is dry and not sticky to the touch, install the bidirectional tensioner.

4. The L-shaped flue anti-smoke leakage installation construction method according to claim 3 is characterized in that: In step 72, the bidirectional tensioner includes a transverse clamp, and the transverse clamp transverse tensioning steps are as follows: Step 721, initial tensioning Install transverse clamps symmetrically from the center of the mesh cloth 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, and simultaneously monitor the gap between the mesh cloth and the base surface. If wrinkles are found, pause immediately and adjust the clamp position. Step 722, tension locking: after reaching the target tension range, a self-locking anchor is used to fix the end of the transverse clamp.

5. The L-shaped flue anti-smoke leakage installation construction method according to claim 4 is characterized in that: In step 72, the bidirectional tensioner includes a longitudinal clamp, and the longitudinal clamp longitudinal tensioning steps are as follows: Step 723, install the longitudinal fixture along the length direction of the mesh cloth, and load it in two stages: Stage 1: Tension 0.8 kN / m, maintained for 10 seconds to eliminate initial relaxation; The second stage: tension 1.0kN / m, maintained for 20 seconds to complete plastic deformation compensation; Step 724, tension monitoring: using a displacement sensor to monitor the extension of the mesh cloth.

6. The L-shaped flue anti-smoke leakage installation construction method according to claim 5, characterized in that: During the horizontal tensioning process, infrared equipment is used to tilt and radiate the mesh surface. After the preheating temperature reaches 60°C, the clamp is locked. During the vertical tensioning process, the vertical tensioning and infrared equipment are heated synchronously. First stage heating: 0.8kN / m vertical tension eliminates relaxation, infrared heating to 80℃ maintains fiber ductility; The second stage of heating: 1.0kN / m to compensate for plastic deformation, infrared heating to 90℃ to complete heat setting.

7. The L-shaped flue anti-smoke leakage installation construction method according to claim 6, characterized in that: During the heating process, an infrared thermometer is used to provide real-time feedback on surface temperature fluctuations.

8. The L-shaped flue anti-smoke leakage installation construction method according to claim 1, characterized in that: In step 2, the slurry extrusion port is designed as an asymmetric triangular cavity.

9. The L-shaped flue anti-smoke leakage installation construction method according to claim 1, characterized in that: Step 7: During the engineering inspection, a sealing test is carried out. Both ends of the flue are closed, compressed air is injected, and the pressure reduction rate is tested within a specified time to determine whether it is qualified.

10. The L-shaped flue anti-smoke leakage installation construction method according to claim 1, characterized in that: An inverted trapezoidal convex rib is arranged on the inner side of the aluminum mold with a slurry extrusion port.

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