Bridge full support pre-pressing settlement automatic monitoring system and method

Abstract

The application discloses a kind of bridge full support preloading settlement automation monitoring system and method, it is related to bridge technical field.The present application includes ground detection module, support preloading detection module and remote automatic monitoring module;Ground detection module is used to the ground needing to be constructed bridge is surveyed;Support preloading detection module is used to the support after completion is preloaded and detected;Remote automatic monitoring module is used to the electric signal when support preloading detection module detects is received, and the electric signal after receiving is converted into curve chart.The present application is through the cooperation of ground detection module, support preloading detection module and remote automatic monitoring module, the signal reception of support preloading detection is carried out, simultaneously by remote automatic monitoring module conversion becomes curve chart convenient for observation;And by the improvement to detection mode, it can be detected by the settlement monitoring sensor combined by static level and steel string displacement meter to the preloading of support when using.

Description

Technical Field

[0001] This invention belongs to the field of bridge technology, and in particular relates to an automated monitoring system and method for pre-stressing settlement of bridge full-span scaffolding. Background Technology

[0002] In bridge beam construction, the full-span scaffolding is erected in stages and preloaded in sections. To verify the reliability of the full-span scaffolding and eliminate its inelastic deformation, the actual deformation of the full-span scaffolding under different loads is measured so that the formwork elevation can be corrected in deflection control. The full-span scaffolding must be preloaded before pouring concrete after the scaffolding is erected.

[0003] Currently, commonly used preloading methods include the sandbag method, the steel reinforcement stacking method, and the water tank method. These methods involve hoisting sandbags, stacking steel reinforcement, or stacking a set of water tanks onto the bottom formwork of the full-span scaffold. Then, loading and unloading are gradually performed according to design requirements to eliminate inelastic deformation, and the elastic deformation of the full-span scaffold is measured. However, existing preloading settlement detection methods require highly skilled surveyors. Leveling operations are significantly affected by weather factors, and limitations imposed by control point layout and site topography result in cumbersome measurement procedures. Inaccurate monitoring data is frequently caused by improper operation by personnel transferring stations, holding leveling rods, and performing backsight operations, making them highly susceptible to human error. Summary of the Invention

[0004] The purpose of this invention is to provide an automated monitoring system and method for preloading settlement of bridge full-span scaffolding, so as to solve the technical problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to an automated monitoring system for preloading settlement of bridge scaffolding, comprising a ground detection module, a scaffolding preloading detection module, and a remote automatic monitoring module;

[0007] The ground detection module is used to survey the ground where a bridge needs to be built.

[0008] The pre-compression detection module is used to perform pre-compression detection on the completed support structure.

[0009] The remote automatic monitoring module is used to receive the electrical signals detected by the support pre-compression detection module and convert the received electrical signals into a curve.

[0010] Furthermore, the ground detection module includes a ground treatment module, a pouring module, and a layout module;

[0011] The ground processing module is used to perform foundation treatment on unfavorable geological conditions mapped by the ground detection module.

[0012] The pouring module is used to pour the geology after it has been processed by the ground treatment module.

[0013] The layout module is used to lay out and mark the positions on the ground after the pouring module has finished pouring, according to the distance required.

[0014] Furthermore, the pouring module includes a leveling module, which is used to detect the flatness of the ground poured by the pouring module.

[0015] Furthermore, the layout module includes a scribing module, which is used to scribing the required straight lines at the layout position.

[0016] Furthermore, the support pre-compression detection module pre-compresses the support by combining sandbag pre-compression and water bag pre-compression.

[0017] Furthermore, the support pre-compression detection module includes a settlement monitoring sensor module, which is used to confirm the signal detected by the support pre-compression module through the settlement monitoring sensor.

[0018] Furthermore, the remote automatic monitoring module includes a data receiving module, a data transmission module, a data monitoring module, and a data storage module;

[0019] The data receiving module is used to receive the electrical signals in the support pre-compression detection module;

[0020] The data transmission module is used to transmit the data received and sent by the data receiving module.

[0021] The data monitoring module is used to monitor the status of the settlement monitoring sensor in the support pre-compression detection module;

[0022] The data storage module is used to save the data generated during the operation of the remote automatic monitoring module.

[0023] An automated monitoring method for preloading settlement of bridge full-span scaffolding, used for any of the above, comprises the following steps:

[0024] The steps are as follows:

[0025] S1: Prepare for bridge construction based on ground conditions, treat the foundation for unfavorable geological conditions, pour the subbase, control the flatness of the subbase during pouring, and then cure the subbase until the subbase concrete reaches its strength requirements.

[0026] S2: Mark the perimeter of the scaffold to be erected, measure the horizontal and vertical spacing of the scaffold, and use ink lines to mark the unit grid for scaffold erection. Erect the scaffold according to the marked unit grid and vertical spacing.

[0027] S3: Conduct a pre-stress test on the erected scaffolding;

[0028] S4: By installing settlement monitoring sensors on the top and ground of the scaffolding, the deformation of the scaffolding top and ground settlement during the preloading and unloading processes are monitored throughout the entire process, as well as the deformation patterns of the scaffolding and ground during the concrete pouring of the beam.

[0029] Furthermore, the pre-compression test of the erected support structure was conducted using sandbag pre-compression and water bag pre-compression methods.

[0030] Furthermore, the settlement monitoring sensor is a combination of a hydrostatic level and a steel wire displacement gauge. The measuring points of the hydrostatic level are arranged at the bottom of the steel wire displacement gauge to monitor the vertical settlement of the ground relative to the pier. The steel wire displacement gauge is used to measure the vertical deformation of the support.

[0031] Furthermore, through a remote automatic monitoring module connected to the settlement monitoring sensor, automatic data acquisition, automatic transmission and interpretation, and remote monitoring are achieved.

[0032] The present invention has the following beneficial effects:

[0033] 1. This invention uses a ground detection module, a support pre-compression detection module, and a remote automatic monitoring module to receive signals for support pre-compression detection, and converts them into a curve graph that is easy to observe through the remote automatic monitoring module.

[0034] 2. By improving the detection method, this invention enables the preload of the support to be detected during use through a settlement monitoring sensor consisting of a static level and a steel wire displacement gauge. At the same time, by arranging the measuring points of the precision static level at the bottom of the steel wire displacement gauge, the vertical settlement of the ground relative to the foundation is monitored, and the steel wire displacement gauge is used to measure the vertical deformation of the support. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart of the present invention;

[0037] Figure 2 This is a flowchart of the ground detection module of the present invention;

[0038] Figure 3 This is a flowchart of the remote automatic monitoring module of the present invention;

[0039] Figure 4 This is a cross-sectional view of the box girder along the longitudinal direction of the present invention;

[0040] Figure 5 This is the mid-span cross section of the present invention;

[0041] Figure 6 This is a front view of the bracket of the present invention;

[0042] Figure 7 This is a side view of the bracket of the present invention;

[0043] Figure 8 This is a flowchart illustrating the pre-compression sequence of the stent in this invention.

[0044] Figure 9 This is a schematic diagram of the installation of the settlement monitoring sensor of the present invention. Detailed Implementation

[0045] 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.

[0046] Example 1:

[0047] Please see Figures 1-3 As shown, the present invention is an automated monitoring system for pre-stressing settlement of bridge full-span scaffolding, including a ground detection module, a scaffolding pre-stressing detection module and a remote automatic monitoring module;

[0048] The ground detection module is used to survey the ground where a bridge needs to be built.

[0049] The ground inspection module includes a ground treatment module, a pouring module, and a layout module;

[0050] The ground processing module is used to perform foundation treatment on unfavorable geological conditions mapped by the ground detection module;

[0051] The casting module is used to cast the geology after it has been treated by the ground treatment module;

[0052] The casting module includes a leveling module, which is used to detect the flatness of the ground poured by the casting module and prevent unevenness.

[0053] The layout module is used to lay out and mark the positions on the ground after the casting module has been cast, according to the distance requirements.

[0054] The layout module includes a scribing module, which is used to scribing the required straight lines at the layout position.

[0055] The support pre-compression detection module is used to perform pre-compression detection on the completed support.

[0056] The support pre-compression detection module pre-compresses the support by combining sandbag pre-compression and water bag pre-compression;

[0057] The support preloading detection module includes a settlement monitoring sensor module, which is used to further confirm the signals detected by the support preloading module through the settlement monitoring sensor;

[0058] The settlement monitoring sensor module consists of a hydrostatic level and a steel wire displacement gauge. The measuring points of the precision hydrostatic level are arranged at the bottom of the steel wire displacement gauge to monitor the vertical settlement of the ground relative to the foundation. The steel wire displacement gauge is used to measure the vertical deformation of the support, that is, the relative height difference between the bottom of the formwork and the ground.

[0059] The remote automatic monitoring module is used to receive the electrical signals during the detection by the support pre-compression detection module and convert the received electrical signals into a curve graph, so that the observer can observe the fluctuations of the curve graph.

[0060] The remote automatic monitoring module includes a data receiving module, a data transmission module, a data monitoring module, and a data storage module;

[0061] The data receiving module is used to receive electrical signals from the support preload detection module, and can also automatically acquire electrical signals to prevent data loss.

[0062] The data transmission module is used to transmit data received and sent by the data receiving module, preventing data corruption.

[0063] The data monitoring module is used to monitor the status of the settlement monitoring sensor in the support pre-compression detection module to prevent data errors caused by failure to detect damage to the settlement monitoring sensor in a timely manner.

[0064] The data storage module is used to save the data generated during the operation of the remote automatic monitoring module, so that the data can be easily retrieved when needed;

[0065] Example 2:

[0066] Please see Figures 4-9 As shown, based on the above embodiment 1, an automated monitoring method for preloading settlement of bridge scaffolding is disclosed, the steps of which are as follows:

[0067] Based on the ground conditions, prepare for the construction of the bridge. According to the actual edge position of the beam, widen it by 1m, mark the edge line of the preloading foundation, level the site and load the preloading foundation, treat the foundation for unfavorable geological conditions, and then pour the subbase. Control the flatness of the subbase during pouring, and then cure the subbase until the subbase concrete reaches its strength requirements.

[0068] Mark the perimeter of the scaffold to be erected, measure the horizontal and vertical spacing of the scaffold, and use ink lines to mark the unit grid for scaffold erection. Erect the scaffold according to the marked unit grid and vertical spacing.

[0069] The beam is a variable cross-section continuous box girder. The cast-in-place box girder in the conventional section is constructed using a full-span disc-lock scaffold, while the main pier top beam section is constructed using a scaffold erection. The design of the construction brackets, supports, or scaffolds should ensure the strength and rigidity of the structure and should have sufficient safety reserves.

[0070] Based on structural and construction requirements, excluding the main pier top beam segment and the cast-in-place side span segment, the cantilevered side span segment is divided into 6 cantilever cast-in-place segments and one side span closure segment (side span closure segment 2m, side span cast-in-place segment 3.92m, beam width 16.25m). (Reference) Figure 4 and Figure 5 Based on the actual conditions at the construction site, the cast-in-place box girder in the conventional section adopts the full-span disc-lock scaffolding construction method. The scaffolding is constructed using disc-lock steel pipe scaffolding (0.6×0.9m at the web on both sides of the main span, 0.9×0.9m at the box chamber, and 1.2×0.9m at the flange; 0.6×1.2m at the web, 0.9×1.2m at the box chamber, and 1.2×1.2m at the flange at the front and rear of the mid-span; 0.6×0.6m within 6 meters of the main pier crossbeam, and 1.2×0.6m at the flange). Please refer to this information. Figure 6 and Figure 7 ;

[0071] The erected scaffolding was pre-loaded using sandbags and water bags.

[0072] Most of the materials were pre-compressed with sandbags, while water bags were used for parts where hoisting was inconvenient. Each bag was weighed according to its standard weight, and the moisture content of the materials was tested. A 25t truck crane was used for hoisting.

[0073] Sandbags and water bags should be weighed individually, with a designated person responsible for weighing and recording the results. After weighing, the sandbags must be stored in place or during pre-compression, and waterproofing measures must be taken. In case of rain, they must be covered with tarpaulins.

[0074] During preloading, the moisture content of the materials inside the sandbags should be monitored, paying close attention to changes in moisture content to ensure the preloading weight meets requirements. Weather conditions should be closely monitored, and the sandbags should be covered with plastic sheeting before rain to prevent overloading due to waterlogging. Loading should be symmetrical to prevent uneven load distribution from causing the support structure to overturn. The preloading amount should be calculated based on the height of the sandbags, and the preloading load should be distributed as evenly as possible with the construction load. Preloading should be carried out in stages, stopping after 60%, 80%, and 100% loading for one day of continuous monitoring of support settlement and displacement. The next stage of load can only be applied after each stage of load application and monitoring is completed and no abnormalities are observed. After all loading is completed, continuous monitoring should be conducted on a daily basis. A cumulative average settlement of less than 5mm over three consecutive monitoring points indicates that the foundation has stabilized. Then, unload the load in reverse order according to the loading stages and re-measure the observation points. Readjust the bottom formwork and set the pre-camber (the basis for setting the pre-camber is the sum of the measured elastic deformation in the ballast test and the pre-camber value provided by the design. After calculating the pre-camber value at each point, adjust the bottom formwork elevation with the support top to make the box girder straight, smooth and beautiful).

[0075] The support structure is stacked from mid-span towards the piers, as follows: Figure 8 As shown in the figure below, the load is distributed symmetrically layer by layer, and the preload should preferably be uniformly distributed within each unit.

[0076] By installing settlement monitoring sensors on the top and ground of the scaffold, the deformation of the top of the scaffold and the ground settlement during the preloading and unloading process of the scaffold are monitored throughout the entire process, and the deformation pattern of the scaffold and the ground is monitored during the concrete pouring of the beam.

[0077] When deploying settlement monitoring sensors on the scaffolding, three monitoring points were selected: the two monitoring points on both sides were 3 meters away from the outer edge of the pier cap, and the middle monitoring point was 10.3 meters apart. The monitoring point at pier No. 36 was used as the reference monitoring point and was placed on the pier cap.

[0078] The settlement monitoring sensors are a combination of a hydrostatic level and a steel wire displacement meter. The hydrostatic level is a differential pressure hydrostatic level with model number JMYC-6210AD, and the steel wire displacement meter is an omnidirectional displacement meter with model number JDDL-4920AT.

[0079] Meanwhile, a precise static level is positioned at the bottom of the steel wire displacement gauge to monitor the vertical settlement of the ground relative to the foundation. The steel wire displacement gauge is used to measure the vertical deformation of the support, which is the relative height difference between the bottom of the formwork and the ground (e.g., ...). Figure 9 (As shown).

[0080] A remote automatic monitoring module connected to the settlement monitoring sensors (an existing device) is used to receive signals from the sensors, enabling automatic data acquisition, transmission, interpretation, and remote monitoring. The data acquisition frequency is set to 1 hour.

[0081] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automated monitoring system for preloading settlement of bridge full-span scaffolding, characterized in that, It includes a ground detection module, a support pre-stress detection module, and a remote automatic monitoring module; The ground detection module is used to survey the ground where a bridge needs to be built. The pre-compression detection module is used to perform pre-compression detection on the completed support structure. The remote automatic monitoring module is used to receive the electrical signals during the detection by the support pre-compression detection module and convert the received electrical signals into a curve. The ground detection module includes a ground treatment module, a pouring module, and a layout module; The ground processing module is used to perform foundation treatment on unfavorable geological conditions mapped by the ground detection module. The pouring module is used to pour the geology after it has been processed by the ground treatment module. The layout module is used to lay out and mark the positions on the ground after the pouring module has finished pouring, according to the distance requirements. The pouring module includes a leveling module, which is used to detect the flatness of the ground poured by the pouring module. The layout module includes a scribing module, which is used to scribing the required straight lines at the layout position. The support pre-compression detection module pre-compresses the support through the combination of sandbag pre-compression and water bag pre-compression; The support pre-compression detection module includes a settlement monitoring sensor module, which is used to confirm the signal detected by the support pre-compression module through the settlement monitoring sensor; The remote automatic monitoring module includes a data receiving module, a data transmission module, a data monitoring module, and a data storage module; The data receiving module is used to receive the electrical signals in the support pre-compression detection module; The data transmission module is used to transmit the data received and sent by the data receiving module. The data monitoring module is used to monitor the status of the settlement monitoring sensor in the support pre-compression detection module; The data storage module is used to save the data generated during the operation of the remote automatic monitoring module.

2. An automated monitoring method for preloading settlement of bridge scaffolding, used in the automated monitoring system for preloading settlement of bridge scaffolding as described in claim 1, characterized in that, The steps are as follows: S1: Prepare for bridge construction based on ground conditions, treat the foundation for unfavorable geological conditions, pour the subbase, control the flatness of the subbase during pouring, and then cure the subbase until the subbase concrete reaches its strength requirements. S2: Mark the perimeter of the scaffold to be erected, measure the horizontal and vertical spacing of the scaffold, and use ink lines to mark the unit grid for scaffold erection. Erect the scaffold according to the marked unit grid and vertical spacing. S3: Conduct a pre-stress test on the erected scaffolding; S4: Settlement monitoring sensors are installed on the top and ground of the full-span scaffold to monitor the deformation of the top of the scaffold and the ground settlement during the preloading and unloading process of the scaffold, and to monitor the deformation pattern of the scaffold and the ground during the concrete pouring of the beam.

3. The automated monitoring method for preloading settlement of a bridge full-span scaffolding according to claim 2, characterized in that, The pre-compression test of the erected scaffolding was carried out using sandbag pre-compression and water bag pre-compression methods.

4. The automated monitoring method for preloading settlement of a bridge full-span scaffolding according to claim 2, characterized in that, The settlement monitoring sensor is a combination of a hydrostatic level and a steel wire displacement gauge, with the hydrostatic level measuring point located at the bottom of the steel wire displacement gauge.

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