Monitoring device for steel truss bridge construction and maintenance method

Abstract

The invention relates to a monitoring device for steel truss bridge construction and an overhauling method, and belongs to the technical field of construction monitoring, the monitoring device comprises a detection module, a control module and a sensing module, the detection module is used for monitoring the position of a steel truss and uploading position data to the control module, and the control module is used for judging whether the position data exceed a threshold value range or not; the sensing module is used for detecting the stress of the steel truss and uploading stress data to the control module, the control module expands a threshold range when the stress exceeds a threshold, the control module inputs the threshold range [A, B] in advance, and the sensing module is used for detecting the stress F of the steel truss and uploading the stress F to the control module; the control module judges whether the position data exceed [A * (1-A1), B * (1 + A1)], and A1 = F / F0; the monitoring accuracy is high.

Description

Technical Field

[0001] The invention belongs to the technical field of construction monitoring, and in particular relates to a monitoring device and a maintenance method for steel truss bridge construction. Background Art

[0002] Steel truss bridge is a type of bridge. The main structure of the bridge is mainly composed of steel trusses. Therefore, when assembling steel trusses and other structures during the construction process, it is necessary to ensure the accuracy of the assembly to ensure the stability of the bridge structure.

[0003] Therefore, it is usually necessary to monitor the construction process during the construction process. Under normal circumstances, the environmental impact of the components during construction is relatively low. However, when the environmental impact is relatively large, the general monitoring method cannot eliminate the interference factors and the detection result is not high. Therefore, Chinese patent CN117119402B discloses a large-span steel truss arch bridge construction monitoring method, including the following contents: S1, installing a data acquisition module on the arch rib truss; S2, moving the arch rib truss pieces in turn to the lifting range of the cable crane; S3, collecting the environmental wind speed in real time, and according to the current The wind speed sets the moving speed of the arch rib truss; S4, hoist the arch rib truss by the cable crane; S5, move the arch rib truss to the installation position at the set speed; S6, collect the acceleration of the hoisted arch rib truss from the data acquisition module, and determine whether the acceleration is within the preset range. If so, maintain the current moving speed; S7, hoist the arch rib truss into place; S8, repeat steps S4-S7, install the left and right sections, and symmetrically suspend the arch rib truss on both sides; S9, install the arch rib truss of the joint section according to the joint temperature specified in the design, and complete the joint of the steel arch ring; its process By collecting the environmental wind speed in real time, it is determined whether the current wind speed meets the construction conditions. When the construction conditions are met, the moving speed of an arch rib truss can be conservatively determined according to the current wind speed. At the same time, in the subsequent lifting process, the acceleration of the shaking is collected in real time by the data acquisition module installed on the arch rib truss, so that the shaking amplitude of the arch rib truss during the lifting process can be judged in combination with environmental factors to ensure the lifting safety of the arch rib truss. However, in the above process, in addition to the wind speed, the stress of the steel truss structure itself is also likely to cause the accuracy of the monitoring result to be reduced. For example, when the steel truss itself is deformed, the distance between the surface of the steel truss and the distance measuring device changes, and the position measurement is only related to the distance between the distance meter and the measuring point on the surface of the steel truss. Therefore, the stress and the deformation caused by the stress are likely to cause the measurement data to be inconsistent with the actual distance. When the steel truss does not actually deviate from the position, the position data exceeds the range, affecting the monitoring. In the above scheme, the influence of the steel truss's own factors on the monitoring is not considered, and the monitoring accuracy is insufficient. Therefore, a monitoring device and maintenance method for steel truss bridge construction with high monitoring accuracy is required. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a monitoring device and maintenance method for steel truss bridge construction, which has the characteristics of high monitoring accuracy.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A monitoring device for steel truss bridge construction includes a detection module, a control module and a perception module. The detection module is used to monitor the position of the steel truss and upload the position data to the control module. The control module is used to determine whether the position data exceeds a threshold range. The perception module is used to detect the stress of the steel truss and upload the stress data to the control module. The control module expands the threshold range when the stress exceeds the threshold.

[0007] As a preferred technical solution of the present invention, the control module is pre-input with a threshold range [A, B], the perception module is used to detect the steel truss stress F and upload it to the control module, and the control module determines whether the position data exceeds [A×(1-A1), B×(1+A1)], where A1=F / F0, F0 is.

[0008] As a preferred technical solution of the present invention, the sensing module is also used to detect the ambient temperature and upload the temperature data to the control module, and the control module expands the threshold range when the stress exceeds the threshold.

[0009] As a preferred technical solution of the present invention, the sensing module is also used to detect the ambient temperature T and upload it to the control module. The control module determines whether the position data exceeds [A×(1-A1)×(1-A2), B×(1+A1)×(1+A2)], where A2=1+(|T-T0|) / T0.

[0010] As a preferred technical solution of the present invention, it also includes a control panel, and the control panel is used to input the values ​​of F0 and T0.

[0011] The present invention also provides a method for using a monitoring device for steel truss bridge construction, comprising the following steps: Step 1: a detection module monitors the position of the steel truss and uploads it to a control module;

[0012] Step 2: The sensing module detects the stress of the steel truss and uploads it to the control module;

[0013] Step 3: The control module determines whether the stress exceeds the threshold. If the determination result is yes, the control module executes step 4; otherwise, the control module executes step 5.

[0014] Step 4: The control module expands the threshold range and executes step 5;

[0015] Step 5: The control module determines whether the position data exceeds the threshold range. If the judgment result is yes, an alarm is issued. If the judgment result is no, it returns to step 1.

[0016] The beneficial effects of the present invention are:

[0017] (1) By setting a perception module to detect the stress of the steel truss, and making the control module expand the threshold range when the stress exceeds the threshold, the stress and the deformation caused by the stress may cause the measured data to be inconsistent with the actual distance. When the steel truss does not actually deviate from the position and the position data exceeds the range, the judgment range of the position deviation is expanded, the probability of false alarm is reduced, and the monitoring accuracy is improved;

[0018] (2) By enabling the perception module to further monitor the ambient temperature of the construction site and upload it to the control module, the control module can further expand the threshold range and relax the judgment criteria when the temperature deviates from normal temperature, the thermal expansion and contraction of the steel truss is more obvious, and the degree and probability of deformation of the steel truss is greater, thereby reducing the probability of the position data of the steel truss exceeding the range when there is no actual position deviation, thereby improving the monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a functional step schematic diagram of the present invention;

[0021] Figure 2 is a control loop block diagram of the present invention;

[0022] Description of main component symbols:

[0023] In the figure: 1. Control module. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0025] See also Figure 1-2 , a monitoring device and maintenance method for steel truss bridge construction, comprising a detection module and a control module 1, the detection module is used to monitor the position of the steel truss and upload the position data to the control module 1, and the control module 1 is used to determine whether the position data exceeds a threshold range;

[0026] Specifically, the detection module includes at least one infrared rangefinder, which is used to detect the distance between itself and the steel truss;

[0027] During the construction process, when the steel truss is installed, an infrared rangefinder is set at the construction site. The infrared rangefinder is used to detect the position of the steel truss to the infrared rangefinder, and the measured position data is uploaded to the control module 1. The operator pre-measures the distance from the steel truss to the infrared rangefinder when the steel truss is installed in the correct position, records it as the target distance, and inputs the value control module 1. At the same time, the control module 1 is pre-set with a threshold range, and the threshold range is a numerical range slightly lower than the target distance and slightly higher than the target distance. For example, if the target distance is 100mm, the threshold range is [99.5, 100.5];

[0028] When in use, the steel truss needs to be installed to the target position. During this process, the detection module monitors the distance between itself and the steel truss to monitor the position of the steel truss, and uploads the position data to the control module 1 at a frequency of once per second. After receiving the data, the control module 1 determines whether the data is within the threshold range. When the judgment result is no, it means that the steel truss exceeds the target position. The control module 1 issues an alarm to complete the monitoring of the bridge construction.

[0029] In actual use, when the steel truss itself is deformed, the distance between the steel truss surface and the distance measuring device changes, and the position measurement is uniquely related to the distance between the distance measuring device and the measuring point on the steel truss surface. Therefore, the stress and the deformation caused by the stress may cause the measurement data to be inconsistent with the actual distance. When the steel truss does not actually deviate from the position, the position data exceeds the range, affecting the monitoring. For this reason, a perception module is also included. The perception module is used to detect the stress of the steel truss and upload the stress data to the control module 1. The control module 1 expands the threshold range when the stress exceeds the threshold.

[0030] Specifically, the control module 1 is pre-input with a threshold range [A, B], the perception module is used to detect the stress F of the steel truss and upload it to the control module 1, and the control module 1 determines whether the position data exceeds [A×(1-A1), B×(1+A1)], where A1=F / F0;

[0031] The sensing module includes a plurality of stress sensors. Before the steel truss is installed, the stress sensors are arranged on the steel truss. During the installation of the steel truss, the plurality of stress sensors monitor the stress of the steel truss. When the steel truss generates internal stress or deformation due to factors such as its own weight at a certain moment, the stress sensor detects the stress change. At this time, the plurality of stress sensors detect the stress and upload it to the control module 1.

[0032] When the control module 1 determines that the stress is large, it means that the steel truss is likely to have undergone a relatively obvious deformation, resulting in a deviation between the position data of the steel truss measured by the monitoring module and the actual position. The position data of the steel truss exceeds the range when the position deviation does not actually occur. At this time, the threshold range needs to be appropriately relaxed to prevent the alarm from being issued when the steel truss does not actually deviate from the position.

[0033] Specifically, each time the control module 1 receives the position data, it determines whether the position data exceeds [A×(1-A1), B×(1+A1)], where A1=F / F0;

[0034] When the stress F is large, it means that the probability and degree of deformation are large, and it is necessary to expand the threshold range and relax the judgment standard of whether the steel truss deviates from the position. At this time, the value of A×(1-A1) becomes smaller to a large extent, the value of B×(1+A1) becomes larger to a large extent, and the range of [A×(1-A1), B×(1+A1)] becomes larger, completing the relaxation of the threshold range when the stress is large;

[0035] By setting the perception module to detect the stress of the steel truss, and making the control module 1 expand the threshold range when the stress exceeds the threshold, the stress and the deformation caused by the stress may cause the measured data to be inconsistent with the actual distance. When the position data of the steel truss exceeds the range when there is no actual position deviation, the judgment range of the position deviation is expanded, the probability of false alarm is reduced, and the monitoring accuracy is improved.

[0036] In some cases, the ambient temperature of the construction deviates from the normal temperature to a large extent. When the size of the steel truss is large, the thermal expansion and contraction of the steel truss is more obvious. At this time, the thermal expansion and contraction will also cause the monitoring module to measure the distance between itself and the steel truss. The position data generated by the measured distance data will deviate from the actual position of the steel truss. When the steel truss does not actually deviate from the position, the position data exceeds the range, affecting the monitoring. Therefore, when the temperature is high, it is also necessary to expand the threshold range. For this reason, the perception module is also used to detect the ambient temperature and upload the temperature data to the control module 1. The control module 1 expands the threshold range when the stress exceeds the threshold;

[0037] In this embodiment, the sensing module is also used to detect the ambient temperature T and upload it to the control module 1. The control module 1 determines whether the position data exceeds [A×(1-A1)×(1-A2), B×(1+A1)×(1+A2)], where A2=1+(|T-T0|) / T0.

[0038] When the temperature deviates from the normal temperature T0 to a large extent, it means that the degree and probability of deformation of the steel truss are large, and it is necessary to further relax the judgment standard of whether the steel truss deviates from the position. At this time, the value of (|T-T0|) / T0 exceeds 0 to a large extent, the value of A2=1+(|T-T0|) / T0 exceeds 1 to a large extent, and the range of [A×(1-A1)×(1-A2), B×(1+A1)×(1+A2)] is greater than [A×(1-A1), B×(1+A1)] to a large extent, completing the further relaxation of the judgment standard when the temperature deviates from the normal temperature T0 to a large extent;

[0039] By enabling the perception module to further monitor the ambient temperature of the construction site and upload it to the control module 1, when the temperature deviates from normal temperature, the thermal expansion and contraction of the steel truss is more obvious, and the degree and probability of deformation of the steel truss are greater, the control module 1 further expands the threshold range and further relaxes the judgment standard, thereby reducing the probability of the position data of the steel truss exceeding the range when there is no actual position deviation, thereby improving the monitoring accuracy.

[0040] In the above process, constants such as T0 and F0 need to be input into the control module 1. To facilitate the input, a control panel is also included, and the control panel is used to input the values ​​of F0 and T0.

[0041] The present invention also provides a method for using a monitoring device for steel truss bridge construction, comprising the following steps:

[0042] Step 1: The detection module monitors the position of the steel truss and uploads it to the control module 1;

[0043] Step 2: The sensing module detects the stress of the steel truss and uploads it to the control module 1;

[0044] Step 3: The control module 1 determines whether the stress exceeds the threshold value. If the determination result is yes, the control module 1 executes step 4; otherwise, the control module 1 executes step 5.

[0045] Step 4: Control module 1 expands the threshold range and executes step 4;

[0046] Step 5: The control module 1 determines whether the position data exceeds the threshold range, and issues an alarm if the determination result is yes, and returns to step 1 if the determination result is no;

[0047] The working principle and use process of the present invention:

[0048] When in use, the steel truss needs to be installed to the target position. During this process, the detection module monitors the distance between itself and the steel truss to monitor the position of the steel truss, and uploads the position data to the control module 1 at a frequency of once per second. After receiving the data, the control module 1 determines whether the data is within the threshold range. When the judgment result is no, it means that the steel truss exceeds the target position. The control module 1 issues an alarm to complete the monitoring of the bridge construction.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A monitoring device for steel truss bridge construction, characterized in that: It includes a detection module, a control module and a perception module. The detection module is used to monitor the position of the steel truss and upload the position data to the control module. The control module is used to determine whether the position data exceeds the threshold range. The perception module is used to detect the stress of the steel truss and upload the stress data to the control module. The control module expands the threshold range when the stress exceeds the threshold.

2. A monitoring device for steel truss bridge construction according to claim 1, characterized in that: The control module is pre-input with a threshold range [A, B], the perception module is used to detect the steel truss stress F and upload it to the control module, and the control module determines whether the position data exceeds [A×(1-A1), B×(1+A1)], where A1=F / F0.

3. A monitoring device for steel truss bridge construction according to claim 1, characterized in that: The sensing module is also used to detect the ambient temperature and upload the temperature data to the control module, and the control module expands the threshold range when the stress exceeds the threshold.

4. A monitoring device for steel truss bridge construction according to claim 1, characterized in that: The sensing module is also used to detect the ambient temperature T and upload it to the control module. The control module determines whether the position data exceeds [A×(1-A1)×(1-A2), B×(1+A1)×(1+A2)], where A2=1+(|T-T0|) / T0.

5. The monitoring device for steel truss bridge construction according to claim 1, characterized in that: A control panel is also included, and the control panel is used to input the values ​​of F0 and T0.

6. A method for using a monitoring device for steel truss bridge construction, characterized in that: The following steps are involved: Step 1: The detection module monitors the position of the steel truss and uploads it to the control module; Step 2: The sensing module detects the stress of the steel truss and uploads it to the control module; Step 3: The control module determines whether the stress exceeds the threshold. If the determination result is yes, the control module executes step 4; otherwise, the control module executes step 5. Step 4: The control module expands the threshold range and executes step 5; Step 5: The control module determines whether the position data exceeds the threshold range. If the judgment result is yes, an alarm is issued. If the judgment result is no, it returns to step 1.

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