Deformation self-adaptive joint control construction method of cantilever steel formwork structure system

Abstract

The application discloses a deformation self-adaptive joint control construction method of a cantilever steel formwork structure system, which is based on the stress and deformation mechanism of the cantilever steel formwork in the construction process, realizes the monitoring and self-adaptive joint control of the deformation of the formwork by establishing the linkage control relationship of the stress-deformation-verticality of the formwork, acquires the lateral pressure and the verticality change in the construction process in real time by arranging the monitoring devices of the lateral pressure and the verticality of the formwork along the height direction, constructs the coupling relationship curve of the two, compares the coupling relationship curve with a theoretical coupling curve, identifies the construction state according to the deviation interval, realizes the self-adaptive regulation and control in the allowable deviation control area, triggers the abnormal diagnosis and safety maintenance mechanism when the measured coupling relationship exceeds the allowable interval or presents an abnormal form, and reflects the fluidity and workability of the concrete along the height direction through the joint analysis of the lateral pressure gradient and the verticality change gradient, so that the adaptability of the pouring working condition is identified.

Description

Technical Field

[0001] This invention relates to the field of cantilever steel formwork construction technology, and more specifically, to a deformation adaptive control construction method for a cantilever steel formwork structure system. Background Technology

[0002] In the construction of large-scale vertical structures such as the concrete sidewalls of ship locks, cantilever steel formwork systems are commonly used as forming support structures. These formwork systems bear significant lateral pressure during concrete pouring, and the combined effects of the formwork's own weight and constraints can easily lead to uneven lateral deformation along the height direction, resulting in structural forming deviations and the risk of loss of verticality control.

[0003] Existing engineering practices typically control formwork stiffness by increasing rigidity, adding diagonal bracing, or relying on empirical safety reserves. However, these methods are primarily based on static safety design and lack the dynamic perception of deformation evolution during construction, making it difficult to reflect the actual stress state of the formwork and the correspondence between deformation and concrete lateral pressure. Under complex construction conditions or long-term continuous pouring, problems such as loose formwork connections, abnormal diagonal bracing constraints, uncoordinated locking and releasing, and changes in concrete workability can all lead to significant deviations between theoretical and actual conditions. Therefore, it is necessary to propose a joint control construction method that combines the stress, deformation, and verticality control mechanisms of cantilever steel formwork, achieving adaptive regulation and anomaly diagnosis, to improve the forming quality and safety assurance capabilities during the construction of large-volume concrete structures. Summary of the Invention

[0004] The purpose of this invention is to provide a deformation adaptive control construction method for cantilever steel formwork structure systems to solve the above-mentioned problems existing in the prior art.

[0005] The application is as follows: An adaptive deformation control construction method for cantilever steel formwork structures is disclosed, applicable to the construction of large-scale structures such as concrete sidewalls of ship locks. Based on the pre-tilted installation condition of the cantilever steel formwork, the method establishes a linkage control relationship between formwork stress, deformation, and verticality to achieve adaptive regulation of formwork deformation during construction. The method includes the following steps: S1 obtains the target concrete lateral pressure distribution value based on the construction design conditions, and establishes a stress calculation model for the cantilever steel formwork structure according to the maximum lateral pressure design value, and determines the theoretical maximum lateral deformation value and deformation curve of the formwork under the design conditions. S2 determines the pre-tilt angle for template installation according to the theoretical lateral deformation, so that the lateral deformation and initial tilt of the template can cancel each other out during the pouring process; S3 deploys stress monitoring devices and verticality monitoring devices along the height direction on the template structure system to form a synchronous monitoring system, which can obtain the lateral pressure value and verticality change value of each height section of the template in real time. S4 establishes a functional coupling relationship between the measured lateral pressure and the measured verticality change, and compares it with the theoretical coupling curve to realize construction status judgment and adaptive control. When the monitoring relationship deviates from the theoretical corresponding range, S5 triggers the abnormal diagnosis and safety maintenance mechanism to identify and handle abnormal formwork stress, abnormal structural release, or abnormal concrete working conditions.

[0006] Furthermore, the theoretical lateral deformation value in step S1 is determined as follows: A coupled force model of the vertical truss and formwork panel of the cantilever steel formwork was established. The lateral pressure of the concrete was converted into equivalent uniformly distributed loads and gradient loads. The deflection value of the formwork section was solved by the deflection equation of structural mechanics, and the deformation function δ(z) and the maximum deformation value δ along the height direction of the formwork were obtained. max .

[0007] Furthermore, the coupling relationship in step S4 is as follows: During concrete pouring, the stress on the formwork and its verticality deviation satisfy the following:

[0008] in Let be the verticality offset angle of the template at height z, and p(z) be the measured lateral pressure of the concrete at the corresponding height. The function is derived from the theoretical structural stiffness matrix and the force model, and corrected by on-site calibration.

[0009] Furthermore, when the measured coupling relationship is within the allowable deviation control zone, adaptive joint control adjustment is triggered. Based on the deviation direction and amplitude, the system links with the construction control execution module to implement fine-tuning of the formwork bracing, optimization of locking and releasing, or correction of pouring parameters, thereby achieving adaptive control.

[0010] Furthermore, if actual [measures] are detected after exceeding the permissible control range... The system is considered abnormal if the curve exhibits any of the following conditions: (1) If the change in verticality is significantly greater than the corresponding theoretical deformation value under stress, it is determined that the template stiffness is insufficient or the structure is loose. (2) The lateral pressure is significantly too large and the deformation is insufficient, which is judged to be abnormal bracing or structural lock-up; (3) The gradient imbalance at different heights is judged to be an abnormal local lateral pressure or an abnormal concrete workability.

[0011] Furthermore, through the lateral pressure gradient along the height direction of the template Verticality variation gradient The combined analysis reflects the fluidity and workability of concrete in the height direction, thereby determining whether the concrete slump matches the design conditions.

[0012] Furthermore, the cantilever steel formwork deformation adaptive control system includes: The lateral pressure sensing module is used to obtain the lateral pressure distribution of freshly poured concrete along the height direction of the cantilever steel formwork. The verticality monitoring module is used to monitor the verticality and lateral deformation of the cantilever steel formwork in real time. The data acquisition and processing module is used to simultaneously acquire lateral pressure and verticality data, and calculate theoretical deformation parameters based on the mechanical model of the cantilever steel formwork structure. The construction control execution module is used to implement construction control in conjunction with the formwork adjustment mechanism based on the diagnostic results. The safety diagnosis and alarm module is used to identify abnormalities in the lateral pressure-verticality coupling relationship and issue alarm signals.

[0013] Compared with the prior art, the embodiments of the present invention achieve the following beneficial effects: By establishing a stress calculation model and theoretical deformation curve for cantilever steel formwork, a functional coupling relationship is formed between the formwork lateral pressure response and verticality deviation, achieving mechanistic control of formwork deformation behavior. By synchronously acquiring changes in formwork lateral pressure and verticality, a measured coupling relationship curve is constructed and compared with the theoretical coupling range. When within the allowable deviation control range, the construction control execution module can be automatically linked according to the deviation direction and amplitude to implement bracing fine-tuning, lock-out optimization, or pouring rhythm correction, achieving proactive adaptive control of formwork deformation. When the measured coupling relationship exceeds the allowable range or abnormal morphological characteristics appear, different types of risks can be identified based on the inconsistency between verticality response and lateral pressure changes, such as insufficient formwork stiffness or structural loosening, abnormal bracing constraints or structural locking, abnormal local lateral pressure, or abnormal concrete workability, realizing the functional expansion from deformation control to construction safety diagnosis. Through joint analysis of lateral pressure gradient and verticality change gradient, the fluidity and workability of concrete along the height direction can be reflected, enabling the judgment of whether the concrete slump matches the design conditions, improving the joint control capability of material and structural conditions during construction. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a cantilever steel formwork structure provided in an embodiment of the present invention; Figure 2 This is a schematic flowchart of a deformation adaptive control construction method for a cantilever steel formwork structure system provided in an embodiment of the present invention.

[0015] Among them: 1-lower layer concrete segment already poured, 2-upper layer concrete segment to be poured, 3-cantilever steel formwork. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings.

[0017] Example 1

[0018] like Figure 1 As shown in the figure, the specific installation process of the cantilever steel formwork structure provided in this embodiment of the invention is as follows: First, a bottom platform and related auxiliary facilities are installed on the solidified lower layer of poured concrete segment 1. Then, a lifting device is used to hoist the pre-assembled working platform to the vicinity of the predetermined position of the bottom layer concrete and perform initial fixing. After a safety inspection, personnel climb onto the working platform to complete the final tightening. After the installation of all working platforms is completed in sequence, the cantilever steel formwork 3 is hoisted as a whole onto the bottom platform and locked. Next, the embedded parts for the upper layer pouring are installed, the verticality of the formwork is precisely adjusted, and after inspection and confirmation that everything is correct, the pouring operation of the upper layer of concrete segment 2 can be carried out.

[0019] like Figure 2 As shown, this invention provides a deformation adaptive control construction method for a cantilever steel formwork structure system, applicable to the construction of large-volume structures such as concrete sidewalls of ship locks. The method is based on the pre-tilted installation condition of the cantilever steel formwork 3, and achieves adaptive regulation of formwork deformation during construction by establishing a linkage control relationship between formwork stress, deformation, and verticality. The method includes the following steps: S1 Theoretical lateral deformation calculation: Based on the construction design conditions, the target concrete lateral pressure distribution value is obtained, and a stress calculation model of the cantilever steel formwork structure is established according to the maximum lateral pressure design value to determine the theoretical maximum lateral deformation value and deformation curve of the formwork under the design conditions.

[0020] During construction, the maximum design value of the concrete lateral pressure is calculated based on the hourly pouring height, initial setting time, and slump, using the following formula: ,

[0021] In the formula, γ c t0 is the density of concrete, v is the initial setting time, h is the height of the concrete lateral pressure, and β1 and β2 are correction coefficients.

[0022] A coupled force model of the vertical truss and formwork panel of the cantilever steel formwork was established based on the maximum lateral pressure. The target lateral pressure of the concrete was converted into an equivalent uniformly distributed load and a gradient load. The deflection function δ(z) of the formwork along the height direction and the maximum lateral deformation value δ were solved using the structural mechanics deflection equation. max .

[0023] Based on the maximum lateral deformation value δ max Given the template height H, theoretically calculate the required pre-tilt angle for the template:

[0024] This ensures that the lateral deformation of the formwork and the initial tilt cancel each other out during the concrete pouring process.

[0025] S2 template pre-tilted installation: The pre-tilt angle of the template installation is determined according to the theoretical lateral deformation, so that the lateral deformation and initial tilt of the template can cancel each other out during the pouring process.

[0026] Before installation, the formwork is hoisted to the predetermined position using equipment such as tower cranes and crawler cranes, and the bottom support is locked to the construction platform using adjustable screws. The pre-tilt angle θ is calculated based on step S1. pre An adjustable diagonal brace is installed between the template back rib and the bottom support. The slight tilt angle can be adjusted by tightening or loosening the screw, so that the template as a whole is slightly tilted inward.

[0027] During installation, a spirit level and total station were used to check the elevation and verticality, and detachable supports were installed on both sides of the formwork for reinforcement to ensure that the formwork is stable and reliable before pouring concrete.

[0028] S3 monitoring device deployment: Lateral pressure sensing modules and verticality monitoring modules are arranged along the height direction on the template structure system. The sensor spacing is determined according to the template height and structural span to form a synchronous monitoring system, which can acquire the lateral pressure value and verticality change value of each height section of the template in real time.

[0029] The lateral pressure sensing module acquires the pressure distribution of freshly poured concrete acting on the formwork in real time, while the verticality monitoring module measures the formwork's tilt angle and deflection changes. The data acquisition module simultaneously collects data from each measuring point and transmits the collected data to the calculation unit for comparison with the theoretical lateral deformation curve.

[0030] S4 Stress-Deformation Coupling and Construction Control: Establish the measured lateral pressure p(z) and measured verticality deviation during the pouring process. Functional coupling relationship:

[0031] in Let be the verticality offset angle of the template at height z, and p(z) be the measured lateral pressure of the concrete at the corresponding height. The function is derived from the theoretical structural stiffness matrix and the force model, and corrected by on-site calibration.

[0032] The measured curve is compared with the theoretical coupling curve in real time. If the measured curve is within the theoretical matching range, the construction status is determined to be normal and conventional construction continues. When the measured curve is within the allowable deviation control range, the system, based on the deviation direction and amplitude, links with the construction control execution module to implement formwork bracing fine-tuning, lock release optimization, or pouring parameter correction to achieve adaptive control. When the measured curve exceeds the theoretical allowable range or exhibits abnormal morphological characteristics, the system triggers the abnormal diagnosis mechanism and enters the safety maintenance and risk handling process.

[0033] S5 Abnormal Diagnosis and Safety Inspection: When the measured coupling relationship deviates from the theoretical corresponding range and exceeds the allowable control range, the safety diagnosis and alarm module issues an alarm signal, triggering the abnormal diagnosis and safety maintenance mechanism to identify abnormal formwork stress, abnormal structural release, or abnormal concrete conditions. For example: (1) If the change in verticality is significantly greater than the corresponding theoretical deformation value under stress, it is determined that the template stiffness is insufficient or the structure is loose. (2) The lateral pressure is significantly too large and the deformation is insufficient, which is judged to be abnormal bracing or structural lock-up; (3) The gradient imbalance at different heights is judged to be an abnormal local lateral pressure or an abnormal concrete workability.

[0034] For abnormal formwork areas, manual or mechanical intervention can be carried out, including readjusting diagonal supports, adding local reinforcement, or suspending pouring for repair. After the abnormality is handled, the lateral pressure and verticality deviation of the formwork are measured again to ensure that they are restored to the design allowable range, forming a closed-loop control to ensure construction safety and formwork forming accuracy.

[0035] Furthermore, in this embodiment, the pressure gradient along the height direction of the template is utilized. Verticality variation gradient The combined analysis reflects the fluidity and workability of concrete in the height direction, thereby determining whether the concrete slump matches the design conditions.

[0036] The deformation adaptive control system of the cantilever steel formwork 3 of the present invention includes: The lateral pressure sensing module is used to obtain the lateral pressure distribution of the freshly poured concrete along the height direction of the cantilever steel formwork 3. The verticality monitoring module is used to monitor the verticality and lateral deformation of the cantilever steel formwork 3 in real time. The data acquisition and processing module is used to simultaneously acquire lateral pressure and verticality data, and calculate theoretical deformation parameters based on the mechanical model of the cantilever steel formwork structure. The construction control execution module is used to implement construction control in conjunction with the formwork adjustment mechanism based on the diagnostic results. The safety diagnosis and alarm module is used to identify abnormalities in the lateral pressure-verticality coupling relationship and issue alarm signals.

[0037] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0038] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. Any of the claimed embodiments can be used in any combination.

Claims

1. A deformation adaptive control construction method for a cantilever steel formwork structure system, applied to the construction of large-volume structures such as concrete sidewalls of ship locks. The method, based on the pre-tilted installation condition of the cantilever steel formwork, achieves adaptive regulation of formwork deformation during construction by establishing a linkage control relationship between formwork stress, deformation, and verticality. Its characteristics are as follows: Includes the following steps: S1 obtains the target concrete lateral pressure distribution value based on the construction design conditions, and establishes a stress calculation model for the cantilever steel formwork structure according to the maximum lateral pressure design value, and determines the theoretical maximum lateral deformation value and deformation curve of the formwork under the design conditions. S2 determines the pre-tilt angle for template installation according to the theoretical lateral deformation, so that the lateral deformation and initial tilt of the template can cancel each other out during the pouring process; S3 deploys stress monitoring devices and verticality monitoring devices along the height direction on the template structure system to form a synchronous monitoring system, which can obtain the lateral pressure value and verticality change value of each height section of the template in real time. S4 establishes a functional coupling relationship between the measured lateral pressure and the measured verticality change, and compares it with the theoretical coupling curve to realize construction status judgment and adaptive control. When the monitoring relationship deviates from the theoretical corresponding range, S5 triggers the abnormal diagnosis and safety maintenance mechanism to identify and handle abnormal formwork stress, abnormal structural release, or abnormal concrete working conditions.

2. The deformation adaptive control construction method for a cantilever steel formwork structure system according to claim 1, characterized in that, The method for determining the theoretical lateral deformation value in step S1 is as follows: A coupled force model of the vertical truss and formwork panel of the cantilever steel formwork was established. The lateral pressure of the concrete was converted into equivalent uniformly distributed loads and gradient loads. The deflection value of the formwork section was solved by the deflection equation of structural mechanics, and the deformation function δ(z) and the maximum deformation value δ along the height direction of the formwork were obtained. max .

3. The deformation adaptive control construction method for a cantilever steel formwork structure system according to claim 1, characterized in that, The coupling relationship in step S4 is as follows: During concrete pouring, the stress on the formwork and its verticality deviation satisfy the following: in Let be the verticality offset angle of the template at height z, and p(z) be the measured lateral pressure of the concrete at the corresponding height. The function is derived from the theoretical structural stiffness matrix and the force model, and corrected by on-site calibration.

4. The deformation adaptive control construction method for a cantilever steel formwork structure system according to claim 1, characterized in that, When the measured coupling relationship is within the allowable deviation control zone, the adaptive joint control adjustment is triggered. The system, based on the deviation direction and amplitude, links with the construction control execution module to implement formwork bracing fine-tuning, lock release optimization, or pouring parameter correction to achieve adaptive control.

5. The deformation adaptive control construction method for a cantilever steel formwork structure system according to claim 1, characterized in that, If actual [condition] is detected after exceeding the allowable control range. The system is considered abnormal if the curve exhibits any of the following conditions: (1) If the change in verticality is significantly greater than the corresponding theoretical deformation value under stress, it is determined that the template stiffness is insufficient or the structure is loose. (2) The lateral pressure is significantly too large and the deformation is insufficient, which is judged to be abnormal bracing or structural lock-up; (3) The gradient imbalance at different heights is judged to be an abnormal local lateral pressure or an abnormal concrete workability.

6. The deformation adaptive control construction method for a cantilever steel formwork structure system according to claim 1, characterized in that, Lateral pressure gradient along the height direction of the template Verticality variation gradient The combined analysis reflects the fluidity and workability of concrete in the height direction, thereby determining whether the concrete slump matches the design conditions.

7. The deformation adaptive control construction method for a cantilever steel formwork structure system according to claim 1, characterized in that, The cantilever steel formwork deformation adaptive control system includes: The lateral pressure sensing module is used to obtain the lateral pressure distribution of freshly poured concrete along the height direction of the cantilever steel formwork. The verticality monitoring module is used to monitor the verticality and lateral deformation of the cantilever steel formwork in real time. The data acquisition and processing module is used to simultaneously acquire lateral pressure and verticality data, and calculate theoretical deformation parameters based on the mechanical model of the cantilever steel formwork structure. The construction control execution module is used to implement construction control in conjunction with the formwork adjustment mechanism based on the diagnostic results. The safety diagnosis and alarm module is used to identify abnormalities in the lateral pressure-verticality coupling relationship and issue alarm signals.

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