A method for solving the problem of eccentric compression of temporary support piers during jacking

Abstract

This invention relates to a method for solving the problem of eccentric compression on temporary jacking supports, comprising the following steps: Step 1: Setting up a pressure detection module and an attitude detection module electrically connected to a control module; Step 2: The pressure detection module monitors the pressure value of each support unit of the support in real time and uploads the pressure data to the control module, and the attitude detection module acquires the attitude and uploads the attitude data to the control module, wherein the attitude data includes the tilt angle and direction of the support; Step 3: The control module determines whether the pressure data and attitude data exceed a preset safety threshold, and issues a warning signal when the determination result is yes.

Description

Technical Field

[0001] This invention belongs to the field of temporary support technology, specifically relating to a method for solving the problem of eccentric compression in jacking temporary supports. Background Technology

[0002] During bridge construction, temporary supports may be used, especially during the jacking process, where temporary supports are needed to provide temporary support and transfer stress on the bridge.

[0003] When the center of gravity of the supported structure is not located at the center of the pier top, an eccentric load will occur. Temporary counterweights are typically added to the beam to balance the structural forces. However, these counterweights increase the stress on the temporary supports, complicate construction, and increase the weight and cost of the supports. To address this, Chinese Patent CN211113200U discloses a temporary beam-pier consolidation system for eccentric loads at the arch foot of a beam-arch composite bridge. This system includes temporary supports evenly installed on the outer side of the beam piers, with reinforcing columns arranged parallel to the outer side of the temporary supports. Both the temporary supports and the reinforcing columns are connected to the beam body and the pier cap. This solution reinforces the outer side of the beam piers, preventing structural imbalance caused by temporary counterweights on the beam, ensuring force balance on both sides of the T-structure during cantilever construction, significantly reducing construction load, and saving construction time and costs.

[0004] However, the structure only underwent conventional reinforcement treatment, which did not fundamentally solve the stress concentration problem caused by eccentric compression. Furthermore, it had poor adaptability to changes in working conditions and lacked monitoring capabilities. Therefore, a method with monitoring capabilities and better adaptability is needed to solve the problem of eccentric compression on the temporary support jacking pier. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this invention provides a method for solving the eccentric compression of temporary jacking supports, which features monitoring capabilities and good adaptability.

[0006] The objective of this invention can be achieved through the following technical solutions: A method for solving the problem of eccentric compression of temporary support piers during jacking, step one: setting up a pressure detection module and an attitude detection module electrically connected to the control module; Step 2: The pressure detection module monitors the pressure value of each support unit of the pier in real time and uploads the pressure data to the control module. The attitude detection module is used to acquire the attitude and upload the attitude data to the control module. The attitude data includes the tilt angle and direction of the pier. Step 3: The control module determines whether the pressure and attitude data exceed the preset safety threshold, and issues a warning signal if the determination result is yes.

[0007] As a preferred embodiment of the present invention, step one further includes: setting up a plurality of strain monitoring modules, the strain monitoring modules being arranged at the four corners of the support; step two further includes: the strain monitoring modules being used to monitor compressive and bending strains and transmit the strain data to the control module in real time; step three further includes: the control module determining whether the strain data exceeds the strain threshold, and issuing an early warning signal when the determination result is yes.

[0008] As a preferred embodiment of the present invention, step three further includes: executing step four when the judgment result is negative; step four also includes: the control module calculates the safety margin index by combining pressure, attitude and strain data using a weighted average, and the control module judges whether the safety margin index is lower than a preset benchmark value, and if it is lower, an alarm is issued.

[0009] As a preferred embodiment of the present invention, step four further includes: the control module calculates the safety margin index S = α×(1) based on the pressure P, the tilt angle θ, and the strain data ε. P / P0) + β×(1 |θ| / θ0) + γ×(1 ε / ε0), where α, β, and γ are the weighting coefficients of pressure, attitude, and strain, respectively, and α+β+γ=1, P0, θ0, and ε0 are the limit thresholds of the corresponding parameters.

[0010] As a preferred technical solution of the present invention, step one further includes: setting a jacking module, the jacking module being set between the bottom of the temporary support and the foundation, and step three further includes: the jacking module being used to automatically adjust the jacking force at the bottom of the support according to the eccentric compression direction when the control module issues an alarm.

[0011] As a preferred technical solution of the present invention, step one further includes: setting up a jacking prediction module, which is used to monitor the jacking progress, calculate the distance between the jacking position and the center of gravity of the temporary support, and transmit the distance to the control module. Step four further includes: the control module judging whether the distance data is greater than the preset safety distance, and correcting the values ​​of P0, θ0, and ε0 downward when the judgment result is yes.

[0012] The beneficial effects of this invention are as follows: By setting up pressure, attitude and strain monitoring modules to collect the stress data of temporary supports in real time, and when a certain data exceeds the preset thresholds P0, θ0 and ε0, the control module will start an alarm, which enables the structure to have monitoring function and improves its adaptability. By using a weighted average to calculate the safety margin index S, the accuracy of data calculation is further improved, and the degree of matching between the safety margin index S and reality is enhanced. By setting up a push module, attitude correction can be completed during the monitoring process. At the same time, by making the push module adjust according to the actual situation, the matching degree between the control action based on the safety margin index S and reality is improved, ensuring the scientific nature and timeliness of the control. By setting up a jacking prediction module and adjusting the threshold based on real-time monitoring data, the judgment criteria for the safety margin index are dynamically adjusted to adapt to the safety risks brought about by changes in structural stress during the jacking process. Attached Figure Description

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a block diagram of the control loop of the present invention. Detailed Implementation

[0015] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0016] Please see Figure 1 A method for solving the problem of eccentric compression of temporary support piers during jacking includes the following steps: Step 1: Set up a pressure detection module and an attitude detection module that are electrically connected to the control module; Step 2: The pressure detection module monitors the pressure value of each support unit of the pier in real time and uploads the pressure data to the control module. The attitude detection module is used to acquire the attitude and upload the attitude data to the control module. The attitude data includes the tilt angle and direction of the pier. Step 3: The control module determines whether the pressure and attitude data exceed the preset safety threshold, and issues a warning signal if the determination result is yes; In this embodiment, the support unit is the load-bearing structure of the temporary pier. There are at least three support units. The specific shape or structure of the support unit is determined according to the actual working conditions or engineering requirements. The support unit is used to support the temporary pier, and the temporary pier is used to support the bridge structure to be constructed. Pressure sensors are installed on the top of each support unit. The attitude detection module uses a dual-axis inclinometer to obtain the tilt angle and direction of the temporary support. The dual-axis inclinometer outputs θx and θy data in real time and uploads them to the control module. The control module calculates the composite tilt angle θ based on θx and θy. The composite tilt angle θ includes the magnitude of the tilt and the main direction. In step three, the control module determines whether the pressure and attitude data exceed the preset safety threshold, and issues a warning signal when the determination result is yes.

[0017] Specifically, the safety thresholds are the pressure threshold P0 and the tilt angle threshold θ0. When the pressure data exceeds P0 or the tilt angle reaches θ0, it means that the pressure or tilt angle is approaching the critical state and an early warning is required. At this time, the control module immediately triggers an audible and visual alarm. The system collects stress data of temporary supports in real time by setting up pressure, attitude and strain monitoring modules, and the control module activates an alarm when a certain data exceeds the preset thresholds P0, θ0 and ε0.

[0018] In actual testing, in addition to pressure and tilt angle, the jacking process may cause stress changes in temporary supports due to the jacking of beam segments and other components. Therefore, step one also includes setting up strain monitoring modules. The strain monitoring modules are set up at the four corners of the supports to collect strain data ε of key sections of the supports in real time. Specifically, step two also includes: the strain monitoring module is used to monitor compressive and bending strain and transmit the strain data to the control module in real time. The strain data ε is obtained by collecting the signals of strain gauges set at the four corners of the support, converting them from analog to digital and then uploading them to the control module; step three also includes: the control module determines whether the strain data exceeds the strain threshold ε0 and issues an early warning signal when the determination result is yes; Specifically, the strain threshold ε0 is determined based on the mechanical properties of the support material and the design load.

[0019] Judging based on a single threshold for a single parameter may lead to misjudgment. For example, when bending strain approaches the threshold alone, it does not necessarily mean that the structure is unstable. However, when multiple parameters approach the threshold and exceed the limits in a coupled manner, the probability of risk increases significantly. At this time, no warning will be triggered. Therefore, step three also includes: when the judgment result is negative, step four is executed. Step four also includes: the control module calculates the safety margin index by combining pressure, attitude and strain data using a weighted average. The control module judges whether the safety margin index is lower than the preset benchmark value. If it is lower, an alarm is issued. By using a weighted average to calculate the safety margin index S, the accuracy of data calculation is further improved, and the degree of matching between the safety margin index S and reality is enhanced.

[0020] The control module calculates the safety margin index S = α×(1) based on the pressure P, tilt angle θ, and strain data ε. P / P0) + β×(1 |θ| / θ0) + γ×(1 ε / ε0), where α, β, and γ are the weighting coefficients of pressure, attitude, and strain, respectively, and α+β+γ=1. P0, θ0, and ε0 are the limit thresholds of the corresponding parameters. Since θ is a vector, its absolute value is used in the calculation. The weighting coefficients α, β, and γ are determined based on the structural characteristics of the pier, the load conditions, and historical failure data. When any one of the parameters—pressure P, tilt angle θ, and strain data ε—approaches the threshold, all three parameters are relatively small, allowing the safety margin index S to remain at a high level. However, when all three approach the threshold simultaneously, the S value will significantly decrease, accurately reflecting the overall trend of system change. Compared to a single parameter criterion, the S value can detect multi-source coupling risks earlier, enabling the system to react promptly in high-risk situations where multiple parameters approach the threshold.

[0021] When the temporary support is unstable, active intervention is required. To this end, step one also includes: setting up a jacking module, which is set between the bottom of the temporary support and the foundation. Step three also includes: the jacking module is used to automatically adjust the jacking force at the bottom of the support according to the eccentric compression direction when the control module issues an alarm. Specifically, the jacking module includes at least several hydraulic jacks, each corresponding to a support unit. These hydraulic jacks apply radial jacking force to the support unit. Optionally, vertically upward hydraulic jacks, each corresponding to a support unit, can be installed at the bottom of the temporary pier to apply upward jacking force, thereby correcting deviations in real time and improving the overall stability of the pier. All hydraulic jacks are connected to a control module and activated according to the safety margin index S and a preset response scheme. By setting up a push module, attitude correction can be completed during the monitoring process. At the same time, by making the push module adjust according to the actual situation, the matching degree between the control action based on the safety margin index S and reality is improved, ensuring the scientific nature and timeliness of the control.

[0022] During the jacking process, the center of gravity of the bridge components supported by the temporary supports will change due to the jacking. When the center of gravity of the bridge components deviates significantly from the center of gravity of the temporary supports, it will lead to local stress concentration in the supports and increase the risk of tilting. To this end, step one also includes: setting up a jacking prediction module, which is used to monitor the jacking progress, calculate the distance between the jacking position and the center of gravity of the temporary support, and transmit the distance to the control module. Step four also includes: the control module judging whether the distance data is greater than the preset safety distance, and correcting the values ​​of P0, θ0, and ε0 downward when the judgment result is yes, so as to enhance the system's response sensitivity during the dynamic adjustment process. Specifically, the jacking progress refers to the real-time position of the bridge component during the jacking process, which is collected in real time by displacement sensors and fed back to the control module. By setting up a jacking prediction module and adjusting the threshold based on real-time monitoring data, the judgment criteria for the safety margin index are dynamically adjusted to adapt to the safety risks brought about by changes in structural stress during the jacking process.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for solving the problem of eccentric compression on temporary supports during jacking, characterized in that: Includes the following steps: Step 1: Set up the pressure detection module and attitude detection module that are electrically connected to the control module; Step 2: The pressure detection module monitors the pressure value of each support unit of the pier in real time and uploads the pressure data to the control module. The attitude detection module is used to acquire the attitude and upload the attitude data to the control module. The attitude data includes the tilt angle and direction of the pier. Step 3: The control module determines whether the pressure and attitude data exceed the preset safety threshold, and issues a warning signal if the determination result is yes; Step one further includes: setting up several strain monitoring modules, which are arranged at the four corners of the support; Step two further includes: the strain monitoring modules are used to monitor compressive and bending strains and transmit the strain data to the control module in real time; Step three further includes: the control module determines whether the strain data exceeds the strain threshold and issues an early warning signal when the determination result is yes; If the judgment result is negative, proceed to step four; step four also includes: the control module calculates the safety margin index by combining pressure, attitude and strain data using weighted average, and the control module judges whether the safety margin index is lower than the preset benchmark value. If it is lower, an alarm is issued. The control module calculates the safety margin index S=α×(1-P / P0)+β×(1-|θ| / θ0)+γ×(1-ε / ε0) based on the pressure P, tilt angle θ and strain data ε, where α, β and γ are the weighting coefficients of pressure, attitude and strain respectively, and α+β+γ=1, P0, θ0 and ε0 are the limit thresholds of the corresponding parameters. The jacking module is set between the bottom of the temporary support and the foundation. Step three also includes: the jacking module is used to automatically adjust the jacking force at the bottom of the support according to the eccentric compression direction when the control module issues an alarm. A jacking prediction module is set up to monitor the jacking progress, calculate the distance between the jacking position and the center of gravity of the temporary support, and transmit the distance to the control module. Step four also includes: the control module determines whether the distance data is greater than the preset safety distance, and corrects the values ​​of P0, θ0, and ε0 downward when the determination result is yes.

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