Prefabricated fireproof wall and its accurate positioning construction method

Abstract

The present application relates to prefabricated building fire separation technical field, especially to a kind of prefabricated fire wall and its accurate positioning construction method. Obtain the measured width of wallboard database establishment;Measured distance between the limiting datum plane of the slot of two end wind-resistant columns;Establish size chain model to calculate total assignable gap;Wallboard combination, installation sequence and target gap are generated;According to order installation and use gasket to control joint width;Detect the actual width of joint, when cumulative deviation exceeds adaptive threshold, re-distribute remaining gap, form closed-loop compensation.The present application provides a kind of prefabricated fire wall and its accurate positioning construction method, and deviation management is changed from open-loop rough estimate to data-driven closed-loop control, so that joint gap is uniform and controllable.

Description

Technical Field

[0001] This invention relates to the field of fire-resistant partition technology for prefabricated buildings, and in particular to a prefabricated firewall and its precise positioning and construction method. Background Technology

[0002] Precast fire walls are crucial structures in substation fire compartmentation systems, used to create fire-resistant isolation between oil-filled equipment such as transformers and reactors, preventing the spread of fire. A typical precast fire wall consists of a cast-in-place reinforced concrete foundation, multiple precast reinforced concrete wind-resistant columns, multiple precast reinforced concrete wall panels, and ground and top beams. The bottom of the wind-resistant columns is inserted into pre-drilled sockets in the foundation, forming a fixed connection through secondary grouting. Vertical grooves are pre-set along the height of the wind-resistant columns on their sides, and the two edges of the wall panels are sequentially inserted into the grooves of adjacent wind-resistant columns, forming vertical joints along the length of the wall panels. These joints are filled with fire-resistant sealant to ensure the fire resistance integrity of the fire wall under fire conditions.

[0003] In the construction of existing prefabricated firewalls, wall panels are typically installed one by one in a fixed sequence from one end of the firewall to the other. The gap between each joint is controlled by the construction workers visually or using a feeler gauge, with the goal of keeping the gap within the allowable range for proper sealant application and effective fire resistance. However, in actual prefabrication, wall panels of the same specification can exhibit width deviations due to variations in formwork, curing, and demolding conditions. When multiple wall panels with width deviations are installed sequentially along the length of the firewall, these deviations are continuously transmitted and accumulated along the installation direction, causing the remaining gap between the end wall panel and the wind-resistant column slot to deviate significantly from the expected value. When the cumulative width of the wall panels is less than the actual clear distance between the wind-resistant columns, the end joint is too wide, potentially exceeding the sealant's fill limit; when the cumulative width of the wall panels is greater than the actual clear distance, the end wall panel cannot be smoothly inserted into the slot, requiring on-site cutting or forced compression, which damages structural integrity and fire-resistant sealing performance.

[0004] The industry typically employs two methods to address the aforementioned issue of cumulative deviations. The first method involves on-site adjustments to the end joints after wall panel installation: if the end gap is too large, additional steel shims are inserted or the amount of sealant is increased; if the end gap is too small, the end wall panels are cut on-site. The second method involves sampling and measuring the width of the wall panels before construction, using the sample mean as a representative value to estimate the distribution scheme of the joint gaps—a process known as open-loop pre-calculation. The limitation of the first method is that concentrated end adjustments disrupt the uniformity of the joint gaps along the length of the firewall. Excessively wide joints may shrink and crack or detach under fire conditions due to sealant expansion, while excessively narrow joints may prevent the sealant from fully filling to the design depth, both reducing the fire resistance integrity of the firewall. The limitation of the second method is that sampling measurements cannot reflect the actual width of each wall panel; the difference between the sample mean and the individual values ​​of each wall panel constitutes an unmodeled random disturbance in the deviation accumulation calculation; and once the open-loop pre-calculation scheme is determined, it cannot be adjusted during construction based on the actual width of the installed joints.

[0005] From the perspective of deviation transmission and control, the common shortcoming of the above methods lies in the failure to establish a closed-loop data flow from the measured data of components to the formulation of installation plans, and then to the feedback and correction during the construction process. The width deviation of each wall panel accumulates independently along the installation direction, and the magnitude of the cumulative deviation at the end increases with the number of wall panels, ultimately having to be passively absorbed through centralized adjustments. In addition, there is also a deviation between the actual position of the wind-resistant columns after installation and the design position, and existing methods lack effective means to incorporate this into a unified analysis and compensation framework, making it difficult to dynamically absorb and homogenize the cumulative error of the dimensional chain during the installation process. Summary of the Invention

[0006] To achieve the above-mentioned objectives, this invention provides a prefabricated firewall and its precise positioning construction method, which aims to solve or at least mitigate the cumulative deviation of wall panel width and wind-resistant column installation position along the length direction, resulting in a serious deviation of the end joint gap from the target value, affecting the sealant construction quality and fire resistance performance.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a prefabricated firewall, comprising a foundation and at least two wind-resistant columns, and multiple wall panels installed between adjacent wind-resistant columns. The foundation is cast in place and has a cup-shaped opening. The wind-resistant columns are inserted into the cup-shaped opening and fixed by grouting material. The side of the wind-resistant column is provided with a slot extending along the height direction, and the side edge of the wall panel is inserted into the corresponding slot.

[0008] After the wall panel is inserted into the slot and meets the minimum support depth, an adjustable end clearance is retained between the end of the wall panel and the limiting reference surface of the slot. The adjustable end clearance is used to absorb the width deviation of the wall panel and the installation position deviation of the wind-resistant column.

[0009] A shim is provided in the joint between adjacent wall panels to control the joint width. The thickness of the shim is selected according to the target gap value of the corresponding joint.

[0010] After installation, the measured distance between the wind-resistant columns at both ends and the limit reference surface of the slot along the length of the firewall is equal to the sum of the measured width of each wall panel, the actual width of each joint, the adjustable clearance at both ends, and the overall systematic deviation on site.

[0011] The actual width of any single joint is within the allowable application width range determined by the fire-resistant sealant product instructions, construction procedures, or fire resistance tests.

[0012] A deviation pre-compensation control system for the construction of the prefabricated firewall as described in claim 1, comprising:

[0013] The component size database stores the measured width data of each wall panel and the measured position data of each wind-resistant column;

[0014] The dimension chain calculation module receives data from the component dimension database, establishes a dimension chain model of the firewall, calculates the cumulative deviation between the total width of the wall panel and the measured distance along the length of the firewall between the wind-resistant columns at both ends relative to the groove limiting reference surface, and outputs the target gap allocation scheme for each joint.

[0015] The installation guide module outputs the installation sequence of the wall panels and the target gap value required for each joint according to the target gap allocation scheme, and indicates the shim thickness used to control the joint gap; the target gap output by the installation guide module is used to determine the on-site shim thickness, and the shim is removed or left after the wall panel is temporarily fixed;

[0016] The seam detection module acquires the actual width data of the seam after the wall panel is installed, and feeds the actual width data back to the dimension chain calculation module;

[0017] The dimension chain calculation module also receives the actual width data fed back by the seam detection module, calculates the cumulative deviation of the installed seams, and when the cumulative deviation exceeds the set threshold, corrects the target gap allocation scheme of the remaining wall panels and outputs an updated gasket thickness indication to form a closed-loop control.

[0018] The dimension chain calculation module executes the following logic:

[0019] Obtain the measured distance along the length of the firewall between the wind-resistant columns at both ends of the firewall and the card slot limit reference surface;

[0020] According to the dimension chain equation, the total distributable clearance is determined by subtracting the sum of the measured widths of the wall panels and the sum of the adjustable clearances at both ends from the measured distance.

[0021] Set the allowable range for the joint gap, which is determined based on the application properties and fire resistance requirements of the fire-resistant sealant;

[0022] When the quotient of the total allocatable gap divided by the number of seams is within the allowable range, the target gap for each seam is set to that quotient.

[0023] When the quotient exceeds the allowable range, the average value is brought into the allowable range by replacing the spare wall panel or adjusting the wall panel installation sequence. If this still fails, non-uniform distribution optimization is initiated. If no feasible solution is found, a prompt indicating that design review or on-site rectification is required is output.

[0024] A method for constructing a prefabricated firewall, comprising:

[0025] Obtain the measured width data of each precast wall panel and establish a component size database;

[0026] After the wind-resistant columns are installed, the measured distance between the two ends of the wind-resistant columns and the relative slot limit reference surface is obtained along the length of the firewall.

[0027] Based on the measured width of the wall panel, the measured distance, and the adjustable clearance at both ends, a dimensional chain model is established to calculate the total distributable clearance.

[0028] Based on the total allocatable gap amount, generate the target gap allocation scheme for each joint and the installation sequence of the wall panels;

[0029] Install the wall panels according to the installation sequence. When installing each joint, use a shim with a thickness equal to or closest to the target gap value to control the joint width. After the wall panels are temporarily fixed and the verticality is checked and approved, remove the shim or leave the fire-resistant shim in the joint.

[0030] After each wall panel is installed and a new seam is formed, the actual width of the seam is measured.

[0031] The actual width detection results are fed back to the dimension chain model to calculate the cumulative deviation between the actual width of the installed seams and the target gap. When the absolute value of the cumulative deviation exceeds the adaptive threshold, the remaining total available gap is updated, and the target gap allocation scheme for the remaining wall panels is regenerated. The adaptive threshold is dynamically determined based on the number of installed seams and the comprehensive standard deviation of a single seam.

[0032] To further realize the present invention, the following technical solutions may be preferred:

[0033] Preferably, detecting the actual width of the seam includes:

[0034] Along the length of the seam, the width of the seam is measured with a feeler gauge at multiple equally spaced measuring points. The arithmetic mean of the widths at each measuring point is taken as the representative value of the actual width of the seam. If the width at any measuring point exceeds the allowable range, even if the average value is qualified, the seam should be marked for review or rework.

[0035] Preferably, after obtaining the actual installation position data of the wind-resistant columns, it is determined whether the deviation between the actual net distance and the design net distance of the wind-resistant columns exceeds the allowable range. If it exceeds the allowable range, compensation is made before the wall panels are hoisted by replacing spare wall panels with different measured widths, adjusting the wall panel installation sequence, using end adjustment components confirmed by the design, or submitting the design for review.

[0036] Preferably, after all wall panels are installed, fire-resistant sealant is applied to each joint, and the joints after the sealant is applied are inspected a second time to obtain the continuity of the sealant surface, the depth of the depression, and the area of ​​the missing sealant area; when the proportion of surface defect area or the length of continuous sealant break exceeds a preset threshold, the joint is marked as needing rework.

[0037] Preferably, the modification of the dimension chain model includes:

[0038] Based on the full-length systematic residuals after the completion of this construction, the estimated value of the on-site comprehensive systematic deviation constant for the next project is recursively updated using an exponentially weighted moving average method; the updated estimated value is used to correct the pre-calculation of the dimensional chain for subsequent projects.

[0039] Preferably, the gasket is a prefabricated rigid gasket set, the thickness of which covers multiple discrete specifications within the allowable range. During installation, the construction personnel select the gasket of the corresponding thickness according to the target gap value displayed by the installation guide module and place it in at least the upper, middle and lower positions of the joint to be formed. Before applying the sealant, the gasket is removed, or a fire-resistant gasket material that can be left in the joint is used.

[0040] The beneficial effects of this invention are:

[0041] This invention redistributes target gaps to remaining seams, dispersing accumulated deviations from the installation phase into seams within the allowable range. This reduces end-point concentration deviations and avoids seam quality defects and reduced fire resistance integrity caused by concentrated end-point finishing. Simultaneously, the dimensional chain model assigns a defined target gap to each seam and physically implements it through gaskets, improving the consistency of seam gaps and making it easier to control the width of a single seam within the allowable range, thereby ensuring the uniformity of sealant application conditions.

[0042] In addition, the component size database records the identification code and measured width of each wall panel, and the installation record includes the target value and actual value of each joint, providing a data foundation for measurement correction and quality traceability in subsequent construction. The introduction of a field comprehensive systematic deviation constant into the size chain model and the recursive update through an exponential weighted moving average method between projects can effectively correct the measurement system and field comprehensive errors, so that the deviation prediction accuracy gradually improves with the accumulation of construction experience. Attached Figure Description

[0043] Figure 1 This is the overall architecture diagram of the prefabricated firewall system of the present invention.

[0044] Figure 2 This is a schematic diagram of the firewall size chain model composition and closed loop of the present invention.

[0045] Figure 3 This is the main flow sequence diagram of the dimensional chain closed-loop deviation pre-compensation construction method of the present invention.

[0046] Figure 4 This is a flowchart of the logic for optimizing the allocation and feedback correction of seam gaps in this invention.

[0047] Figure 5 This is a schematic diagram of the feedback correction control loop and adaptive threshold triggering mechanism of the present invention. Detailed Implementation

[0048] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. This embodiment takes a prefabricated firewall next to the main transformer of a substation as an example. The firewall consists of a reinforced concrete foundation cast on site, two prefabricated wind-resistant columns, six prefabricated wall panels, and ground beams and top beams.

[0051] Example 1

[0052] Combination Figure 1 The system architecture shown in this invention includes a firewall body and a closed-loop deviation pre-compensation stringing and hoisting control system that works in conjunction with the firewall body. The control system includes: a component data acquisition unit, a field total station precision positioning unit, a microcomputer central computing terminal for dimension chains, and a portable wireless work guidance terminal.

[0053] In terms of physical structure, the firewall foundation has a cup-shaped opening, into which the lower end of the wind-resistant column is inserted. It is fixed using grouting material or fine aggregate concrete that meets the design strength requirements; in this embodiment, C40 micro-expansion fine aggregate concrete is used. Vertical slots are pre-set along the height direction on the sides of the wind-resistant column. After the wall panel is inserted into the slot and meets the minimum support depth, an adjustable clearance is maintained between the end of the wall panel and the limiting reference surface of the slot, generally 15mm to 25mm. The specific value is determined according to the structural support depth and fireproof sealing requirements; this clearance is denoted as c1 and c2 in the dimensional chain calculation. The two sides of the wall panel are inserted into the corresponding slots of the adjacent wind-resistant column. The ground beam is placed on the top surface of the foundation, between two adjacent wind-resistant columns, supporting the bottom of the wall panel. The top beam is located on the top of the wall panel, and its two ends are connected to the top of the wind-resistant column through cast-in-place reinforced concrete joints, forming an integral frame load-bearing system.

[0054] The component dimension database is deployed on an industrial tablet PC at the construction site, using an embedded SQLite relational database. The database contains wall panel information tables and wind-resistant column information tables. Each record in the wall panel information table stores the wall panel's unique identification code, design width, factory measured width, measurement timestamp, and quality inspection conclusion. Each record in the wind-resistant column information table stores the wind-resistant column's unique identification code, design cross-sectional dimensions, design and measured values ​​of the location and depth of each slot, and the three-dimensional coordinates of the top and bottom measuring points after installation. After the database is built at the factory, it is transmitted to the industrial tablet PC at the construction site via encrypted mobile storage media or a virtual private network connection.

[0055] The dimensional chain calculation module is the core computing component of the closed-loop deviation pre-compensation stringing and hoisting control system, running on an industrial panel PC. This module is functionally divided into a dimensional chain modeling subunit, a deviation optimization allocation subunit, and a feedback correction subunit. The dimensional chain modeling subunit reads the measured width data of the wall panels and the installation position data of the wind-resistant columns from the component size database, establishes the dimensional chain model of the firewall, and calculates the total allocable clearance. The deviation optimization allocation subunit, based on the total allocable clearance, generates an allocation scheme for the target clearance of each joint by uniformly distributing or replacing wall panels or solving the optimization model. The feedback correction subunit receives the actual width data of the installed joints from the joint detection module, calculates the cumulative deviation, and when the absolute value of the cumulative deviation exceeds the adaptive threshold, corrects the dimensional chain model and updates the target clearance allocation scheme and installation sequence of the remaining wall panels, forming a closed-loop control link of "prediction-installation-detection-correction".

[0056] The installation guidance module runs on an industrial tablet PC and serves as the human-machine interface for construction workers. This module receives the wall panel installation sequence, target gap values ​​for each joint, and recommended gasket thickness specifications from the dimensional chain calculation module. It then displays this information on the screen in a graphic and textual format, guiding the construction team to install the wall panels according to the specified sequence and gasket specifications.

[0057] The hardware of the seam inspection module includes a high-precision feeler gauge. Under normal construction conditions, quality inspectors use the high-precision feeler gauge to measure the width of each seam at three equally spaced points along its length (upward, middle, and downward), reading and recording the data from each point. The arithmetic mean is taken as the representative value of the seam's actual width. If the width at any point exceeds the allowable range, even if the arithmetic mean is acceptable, the seam should be marked as abnormal and require review or rework. The inspection data is transmitted in real-time to an industrial tablet PC via a wireless LAN or USB interface for use by the dimensional chain calculation module.

[0058] Example 2

[0059] The construction method of this invention unfolds sequentially according to the time sequence and data flow of the actual construction process, combined with... Figures 2 to 5 Please provide an explanation.

[0060] Step 1: Obtain the measured width data of each precast wall panel and establish a component size database.

[0061] On the precast component factory production line, after the wall panels are demolded and steam-cured, they enter the dimensional inspection station. The inspection station consists of a pneumatic positioning device, a laser rangefinder, an electric linear slide, and an industrial control computer. The positioning device pushes the wall panel against a fixed reference surface, ensuring that the width direction of the wall panel is parallel to the direction of movement of the slide. The laser rangefinder is an industrial-grade laser displacement sensor based on the time-of-flight principle, mounted on the slider of the electric linear slide. The slide drives the sensor to scan back and forth multiple times along the width direction of the wall panel, collecting distance data at multiple equally spaced measuring points. The data from each measuring point is converted into the actual width position of the wall panel at that measuring point after sliding median filtering. The arithmetic mean of the width values ​​of all valid measuring points is taken to obtain the representative measured width value of the wall panel. To reduce the influence of changes in the surface reflectivity of the wall panel, the sensor is calibrated using a standard test block with the same mix ratio before each batch of measurements.

[0062] After each wall panel is measured, the system automatically generates a unique identification code and writes the identification code, measured width value, original data of each measuring point, measurement timestamp, and ambient temperature into the component size database. The measured data of the slot position and depth of the wind-resistant columns in the same batch are also entered into the database in the same way. After the database is built at the factory, it is synchronized to the industrial tablet PC at the construction site via encrypted mobile storage media. This step corresponds to... Figure 3 The first step in the flowchart.

[0063] Step 2: After the wind-resistant columns are installed, obtain the actual installation location data.

[0064] After the foundation concrete reaches its design strength, the wind-resistant columns are hoisted and their verticality and planar position are corrected. After correction, C40 micro-expansion fine aggregate concrete is poured into the foundation. Once the grout reaches its predetermined early strength, an automatic total station is used to precisely measure the actual installation position of the wind-resistant columns. The total station is set up at known control points on the construction site. Before measurement, air temperature, air pressure, and relative humidity are input for atmospheric refraction and Earth curvature correction. A measurement marker is pre-embedded at the top and bottom of each wind-resistant column. For each marker, the total station performs two independent aiming and distance measurements in both left- and right-side positions, and the average of the plane coordinates is taken as the measurement result. The tilt direction and angle of the wind-resistant column are calculated based on the difference in plane coordinates and height between the top and bottom measuring points to ensure that the tilt rate meets structural safety requirements. After acceptance, the projected distance of the end slot limit reference planes along the wall length is measured as... The data is then stored in the database. In this embodiment, The distance between the reference surfaces of the two end slots. , This refers to the adjustable clearance between the end of the wall panel and the corresponding limiting surface. This step corresponds to... Figure 3 The second part of the flowchart.

[0065] Step 3: Establish a dimensional chain model and calculate the total distributable clearance.

[0066] Combination Figure 2 The dimension chain model shown has the following dimension chain equation along the length of the firewall:

[0067]

[0068] In the formula: The measured distance along the length of the firewall is between the two wind-resistant columns and the reference plane of the card slot limit. For the first The factory measured width of the wall panel; For the first The target gap of the seam; , The adjustable clearances are located at the inner ends of the first and last wind-resistant columns, respectively. This represents the overall systemic residual after the installation and closure of the project. It can be set to 0 in the initial calculation to absorb the overall horizontal errors such as the total station constant, the overall tilt of the wind-resistant column, and the cumulative residual of the foundation layout.

[0069] Total distributable clearance Defined as the remaining amount after subtracting all known dimensions from the measured distance:

[0070]

[0071] This step corresponds to Figure 3 The third step in the flowchart.

[0072] Step 4: Generate the target gap allocation scheme and wall panel installation sequence.

[0073] Combination Figure 4 The logical flow shown is as follows, and the allocation scheme generation process is as follows.

[0074] First, calculate the uniform distribution value. ,in This represents the total number of wall panels. It sets the allowable range for joint gaps. . The minimum insertable width and flow filling capacity of the sealant nozzle are determined based on the sealant nozzle, and are usually taken as 8mm. The value is determined based on the expansion ratio of the sealant under fire conditions and the mechanical stability of the sealing layer after expansion, typically taken as 15 mm. Both values ​​are ultimately determined based on the sealant supplier's technical data sheet and the results of fire resistance tests on firewalls.

[0075] like In For the interior, a uniform distribution scheme is adopted: the target gap for all seams. The installation order is from one end of the firewall to the other.

[0076] like This indicates that the total available clearance is insufficient. The dimensional chain calculation module retrieves prefabricated but unallocated spare wall panels from the component size database within the same batch, and selects the wall panel with the narrowest measured width to replace the widest wall panel in the current installation sequence. The calculation is recalculated after each replacement. and Iterate to Entering the allowed range.

[0077] like This indicates that the total allocatable clearance is too large. The system will first attempt to replace the narrowest wall panel in the current sequence with a spare wall panel that has a larger measured width. If replacement still fails to achieve the desired clearance, the system will proceed as follows: If so, then the non-uniform distribution optimization solution will be initiated. > For example Figure 4 As shown, the optimization model introduces auxiliary slack variables. Construct the following linear programming problem:

[0078]

[0079]

[0080] In the linear programming model above:

[0081] Equations (1) and (2) utilize auxiliary slack variables The target gap for any single seam is defined. Compared with the ideal gap value The upper bound of the absolute value deviation between them is determined by the objective function. By performing a minimization solution, the global optimization of the uniformity of the gaps between all seams over the entire length is achieved, avoiding local seams that are too large or too small.

[0082] Equation (3) is the total gap amount equality constraint, ensuring that the sum of the target gaps of each joint after recalculation is strictly equal to the current remaining available total gap amount. This ensures that the dimensional chain closes precisely at the end;

[0083] Equation (4) is a constraint on the gap size range, which strictly limits the final allocation result of each joint to the allowable application width range determined by the process performance of the fire-resistant sealant. Internally, it eliminates the potential risks of forced compression of out-of-tolerance components or gaps that are too wide to be filled from the physical boundary.

[0084] This linear programming model can be solved in seconds on an industrial tablet PC. The output is the optimal solution. This refers to the non-uniform distribution scheme of the target gaps between each joint. If the non-uniform distribution still has no feasible solution, the installation will be stopped and a prompt will be output indicating whether to replace the component, adjust the design clearance, or submit the design for review.

[0085] This step corresponds to Figure 3 The fourth step in the flowchart.

[0086] Step 5: Install the wall panels according to the plan.

[0087] The installation guide module's screen displays the identification code of the wall panel to be installed, the target gap value for the next joint, and the corresponding gasket thickness specifications. The gaskets are prefabricated rigid gasket assemblies, with a thickness covering... Multiple discrete specifications within the range (e.g., intervals of 0.5mm or 1mm). Construction workers select the gasket from the gasket set that is closest to the target gap thickness and insert it at least in three positions: top, middle, and bottom, placing it on the edge of the installed wall panel facing the side to be installed. A crane lifts the next wall panel into position, slowly bringing its side edge close to the gasket. After confirming verticality, release the hook or maintain slight force for temporary fixation. After completing the verticality check, remove the gasket before applying sealant; if a fire-resistant gasket material that can be retained is used, and its fire resistance is not lower than the requirements of the joint sealant, it can be left inside the joint. This step corresponds to... Figure 3 The fifth step in the flowchart.

[0088] Step 6: Detect the actual width of the formed seam.

[0089] After each seam is formed, quality inspectors use feeler gauges to measure the width at three points along the seam's length: top, middle, and bottom. The values ​​at each point are read and recorded, and the arithmetic mean is taken as the representative value of the seam's actual width. If the width at any point exceeds the allowable range... Even if the arithmetic mean is acceptable, the seam should still be marked as abnormal and require review or rework. Inspection data is entered via a tablet interface and transmitted in real-time to the dimensional chain calculation module. This step corresponds to... Figure 3 The sixth step in the flowchart.

[0090] Step 7: Feedback on test results and revision of the plan.

[0091] Combination Figure 5 The feedback correction control loop shown in the diagram has its feedback correction subunit in the dimension chain calculation module receiving the average actual width of the current seam and calculating its deviation from the target gap. And sum them up to get the cumulative deviation of the currently installed seams. .

[0092] Adaptive threshold Based on the number of installed seams and the overall standard deviation of single seam Dynamic calculation:

[0093]

[0094] in The absolute minimum threshold is typically set to 2.0 mm. For standard normal distribution The quantile is usually taken as 1.645 (corresponding to a 90% confidence level). The standard deviation is the combined error of construction positioning, gasket thickness, and joint inspection. It is usually taken as 1.0mm to 1.5mm and is set before construction through trial installation or historical construction records.

[0095] when (Dead zone, usually taken) When ), no fix is ​​triggered. At this time, the system records the deviation but does not trigger correction, and continues monitoring. If it is determined that continuing with the original installation plan may result in subsequent seams exceeding the allowable range, a feedback correction process is triggered. The correction steps are: calculate the remaining total available gap. ;according to And the number of remaining seams to be installed The allocation logic in step 4 is then re-executed to generate an updated target gap allocation scheme and gasket thickness guidelines. The installation guide module then refreshes its display, and subsequent wall panels are installed according to the updated scheme.

[0096] This step corresponds to Figure 3 The flowchart shows a feedback loop that leads back from the sixth stage to the third and fourth stages.

[0097] Step 8: Apply sealant and inspect quality.

[0098] After all wall panels are installed and the dimensional chain is closed, each joint is cleaned and fire-resistant sealant is applied. Following application, a second inspection is performed on the joint surface to obtain information on sealant continuity, depth of depressions, and area of ​​missing sealant. When the proportion of surface defects or the length of continuous sealant breaks exceeds a preset threshold, the system marks the section and guides the construction personnel to reapply the sealant. Upon completion of construction, the system generates a firewall installation quality report, including the identification code of each wall panel, the target gap and actual width of each joint, feedback correction records, and timestamps for each process. The value of the adjustable end clearance must not reduce the design requirements for wall panel insertion depth, minimum support length, and fire-resistant sealing thickness.

[0099] In addition, after the completion of this construction, the dimension chain calculation module calculates the systematic residual along the entire length after the construction is closed, based on the actual width data of all joints:

[0100]

[0101] The field comprehensive systematic deviation constant for the next project is updated recursively using an exponentially weighted moving average method. :

[0102]

[0103] in This is a smoothing coefficient, typically ranging from 0.2 to 0.3. (Updated) Pre-calculations used to correct subsequent project dimension chains are used to compensate for comprehensive horizontal errors such as total station constants, overall tilt of wind-resistant columns, and cumulative residuals of foundation layout, so that the accuracy of deviation prediction gradually improves with the accumulation of construction experience.

[0104] Example 3 Verification

[0105] This embodiment uses a prefabricated firewall next to the main transformer of a substation as the object of verification. The firewall consists of a reinforced concrete foundation cast on site, two prefabricated wind-resistant columns, six prefabricated wall panels, and ground beams and top beams.

[0106] Static uniform distribution scenario (no feedback trigger)

[0107] Taking a main transformer firewall approximately 12m long as an example. The measured distance between the wind-resistant columns at both ends. Adjustable clearance at the inner end of the wind-resistant column. The factory measured width (in mm) of the six precast wall panels is as follows:

[0108]

[0109] The sum of the measured widths of the wall panels Total allocatable clearance Uniformly distributed value The wall panel exceeded the upper limit by 15mm. Two spare panels with measured widths of 1990.5mm and 1991.2mm were retrieved from the database and used to replace the wall panel. and After replacement , , , in The target gap is evenly distributed as 12.8mm (64.0mm for the 5 seams, with the remaining 0.1mm allocated to adjustable clearance at both ends). During installation, 12.8mm shims were used, and the measured seam widths were 12.9, 12.7, 13.0, 12.6, and 12.9mm respectively, with a cumulative deviation of only +0.1mm, which did not trigger feedback correction.

[0110] Dynamic feedback correction scenario

[0111] Another section of the same type of firewall under construction, the actual measured distance between the wind-resistant columns at both ends. Adjustable clearance at the end The initial wall panel sequence and replacement results are the same as above, and the target gap is 12.8mm.

[0112] The first two seams were installed smoothly, with measured widths of 12.8mm and 12.9mm respectively, and a cumulative deviation of +0.1mm, which is far below the adaptive threshold. No fix was triggered.

[0113] During the installation of the third wall panel, due to small concrete protrusions on the edge of the panel that were not completely cleaned, the workers failed to fully compact the shims. After the crane released the hook, the wall panel exhibited slight rebound, resulting in the measured width of the third joint reaching 16.2mm. This joint exceeded the allowable range; the protrusions should be cleaned and the measurement re-measured on-site. If the re-measurement still shows 16.2mm, the joint should be marked as requiring partial rework. This example uses this out-of-tolerance data to illustrate the triggering process of the feedback correction mechanism. At this point, the cumulative deviation... Adaptive threshold . This triggers feedback and correction.

[0114] The feedback correction subunit intervened immediately. The actual clearance consumed by the first three seams was 12.8 + 12.9 + 16.2 = 41.9 mm. The remaining total usable clearance... =64.1-41.9=22.2mm. Remaining number of seams to be installed is m=2. Redistribute evenly. = 22.2 / 2=11.1mm, which is within the range of [8, 15]mm. The installation guide module refreshes the display, indicating that the next two seams should use 11.0mm shims (with a discrete specification of 0.5mm, 11.1mm is taken as the closest 11.0mm, and the remaining 0.1mm is allocated to the adjustable clearance at the end).

[0115] The fourth seam was installed to a target width of 11.0mm, but the actual measured width was 11.2mm. The fifth seam was also measured at 11.0mm. After correction, the subsequent two seams were within the allowable range; the third seam that exceeded the tolerance was handled according to the rework rules or was cleaned and re-measured and found to be acceptable. After all installations were completed, the actual width of the final seam was 11.0mm, completely within the allowable range of [8, 15]mm. No on-site cutting or forced compression was performed during the entire construction process, and the accumulated deviation was successfully absorbed through the feedback correction mechanism. This embodiment fully verifies the effectiveness of the "detection-feedback-correction" closed-loop control core mechanism of this invention.

[0116] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prefabricated firewall, comprising a foundation and at least two wind-resistant columns, and multiple wall panels installed between adjacent wind-resistant columns, wherein the foundation is cast in place and has a socket, the wind-resistant columns are inserted into the socket and fixed by grouting material, the sides of the wind-resistant columns are provided with slots extending along the height direction, and the side edges of the wall panels are inserted into corresponding slots, characterized in that: After the wall panel is inserted into the slot and meets the minimum support depth, an adjustable end clearance is retained between the end of the wall panel and the limiting reference surface of the slot. The adjustable end clearance is used to absorb the width deviation of the wall panel and the installation position deviation of the wind-resistant column. A shim is provided in the joint between adjacent wall panels to control the joint width. The thickness of the shim is selected according to the target gap value of the corresponding joint. After installation, the measured distance between the wind-resistant columns at both ends and the limit reference surface of the slot along the length of the firewall is equal to the sum of the measured width of each wall panel, the actual width of each joint, the adjustable clearance at both ends, and the overall systematic deviation on site. The actual width of any single joint is within the allowable application width range determined by the fire-resistant sealant product instructions, construction procedures, or fire resistance tests.

2. A deviation pre-compensation control system for the construction of the prefabricated firewall as described in claim 1, characterized in that, include: The component size database stores the measured width data of each wall panel and the measured position data of each wind-resistant column; The dimension chain calculation module receives data from the component dimension database, establishes a dimension chain model of the firewall, calculates the cumulative deviation between the total width of the wall panel and the measured distance along the length of the firewall between the wind-resistant columns at both ends relative to the groove limiting reference surface, and outputs the target gap allocation scheme for each joint. The installation guide module outputs the installation sequence of the wall panels and the target gap value required for each joint according to the target gap allocation scheme, and indicates the shim thickness used to control the joint gap; the target gap output by the installation guide module is used to determine the on-site shim thickness, and the shim is removed or left after the wall panel is temporarily fixed; The seam detection module acquires the actual width data of the seam after the wall panel is installed, and feeds the actual width data back to the dimension chain calculation module; The dimension chain calculation module also receives the actual width data fed back by the seam detection module, calculates the cumulative deviation of the installed seams, and when the cumulative deviation exceeds the set threshold, corrects the target gap allocation scheme of the remaining wall panels and outputs an updated gasket thickness indication to form a closed-loop control.

3. The deviation pre-compensation control system according to claim 2, characterized in that, The dimension chain calculation module executes the following logic: Obtain the measured distance along the length of the firewall between the wind-resistant columns at both ends of the firewall and the card slot limit reference surface; According to the dimension chain equation, the total distributable clearance is determined by subtracting the sum of the measured widths of the wall panels and the sum of the adjustable clearances at both ends from the measured distance. Set the allowable range for the joint gap, which is determined based on the application properties and fire resistance requirements of the fire-resistant sealant; When the quotient of the total allocatable gap divided by the number of seams is within the allowable range, the target gap for each seam is set to that quotient. When the quotient exceeds the allowable range, the average value is brought into the allowable range by replacing the spare wall panel or adjusting the wall panel installation sequence; if this still cannot be satisfied, non-uniform distribution optimization solution is initiated. If no feasible solution is found, a prompt will be output indicating that design review or on-site rectification is required.

4. A construction method for a prefabricated firewall, characterized in that, include: Obtain the measured width data of each precast wall panel and establish a component size database; After the wind-resistant columns are installed, the measured distance between the two ends of the wind-resistant columns relative to the card slot limit reference surface is obtained along the length of the firewall. Based on the measured width of the wall panel, the measured distance, and the adjustable clearance at both ends, a dimensional chain model is established to calculate the total distributable clearance. Based on the total allocatable gap amount, generate the target gap allocation scheme for each joint and the installation sequence of the wall panels; Install the wall panels according to the installation sequence. When installing each joint, use a shim with a thickness equal to or closest to the target gap value to control the joint width. After the wall panels are temporarily fixed and the verticality is checked and approved, remove the shim or leave the fire-resistant shim in the joint. After each wall panel is installed and a new seam is formed, the actual width of the seam is measured. The actual width detection results are fed back to the dimension chain model to calculate the cumulative deviation between the actual width of the installed seams and the target gap. When the absolute value of the cumulative deviation exceeds the adaptive threshold, the remaining total available gap is updated, and the target gap allocation scheme for the remaining wall panels is regenerated. The adaptive threshold is dynamically determined based on the number of installed seams and the comprehensive standard deviation of a single seam.

5. The construction method according to claim 4, characterized in that, The detection of the actual width of the seam includes: Along the length of the seam, the width of the seam is measured with a feeler gauge at multiple equally spaced measuring points. The arithmetic mean of the widths at each measuring point is taken as the representative value of the actual width of the seam. If the width at any measuring point exceeds the allowable range, even if the average value is qualified, the seam should be marked for review or rework.

6. The construction method according to claim 4, characterized in that, After obtaining the actual installation location data of the wind-resistant columns, determine whether the deviation between the actual net distance and the design net distance of the wind-resistant columns exceeds the allowable range. If it exceeds the allowable range, compensation is made before the wall panels are hoisted by replacing them with spare wall panels of different measured widths, adjusting the wall panel installation sequence, using end adjustment components confirmed by the design, or submitting the design for review.

7. The construction method according to claim 4, characterized in that, After all wall panels are installed, fire-resistant sealant is applied to each joint, and the joints are then inspected a second time to obtain the continuity of the sealant surface, the depth of the depression, and the area of ​​the missing sealant. When the proportion of surface defect area or the length of continuous sealant break exceeds a preset threshold, the joint is marked as needing rework.

8. The construction method according to claim 4, characterized in that, The corrections to the dimension chain model include: Based on the full-length systematic residuals after the completion of this construction, the estimated value of the on-site comprehensive systematic deviation constant for the next project is recursively updated using an exponentially weighted moving average method; the updated estimated value is used to correct the pre-calculation of the dimensional chain for subsequent projects.

9. The construction method according to claim 4, characterized in that, The gasket is a prefabricated rigid gasket set, the thickness of which covers multiple discrete specifications within the allowable range. During installation, the construction personnel select the gasket of the corresponding thickness according to the target gap value displayed by the installation guide module and place it in at least the upper, middle and lower positions of the joint to be formed. Before applying the sealant, remove the gasket or leave it in the joint using a reusable fire-resistant gasket material.

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