Weighing and camber downwarping measuring method for steel structure bridge

Abstract

The invention discloses a weighing and camber downwarping measuring method for a steel structure bridge, which comprises the following steps of: S1, analyzing before weighing, determining the stress condition of each hoisting point on the steel structure bridge, and selecting weighing hoisting equipment; s2, a weight sensor is additionally arranged on the weighing hoisting equipment, and digital display equipment is configured; s3, the steel structure bridge is conveyed to a weighing site; s4, arranging camber measuring points on the steel structure bridge; s5, arranging a steel wire rope and a wireless tension meter; s6, the steel structure bridge is lifted; s7, the stress state of the steel structure bridge is adjusted; and S8, data acquisition and analysis. According to the method, the accurate stress condition of each hoisting point and the camber change value in the hoisting state are obtained, so that bridge site rapid installation is facilitated, and the field erection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the manufacturing technology of steel structure bridges, and more specifically, to a method for weighing and measuring the camber deflection of steel structure bridges. Background Art

[0002] With the continuous development of the bridge market, steel bridges, which have the characteristics of strong ornamental value, high strength, and light self-weight, have gradually become the mainstream of current bridge construction. As a result, the production and manufacturing of steel bridges have been vigorously developed. At the same time, data such as the weight of steel bridges and accurate deflections have gradually become a concern for builders. The weight of prefabricated steel bridges is not only the basis for manufacturing pricing but also plays an indispensable role in the alignment of bridge erection. Accurately collecting and analyzing data such as the deflection of beam segments in advance can effectively facilitate the accurate selection of equipment and reasonable operation during the erection of bridge position beam segments, realize the accurate erection of beam segments. At the same time, when manufacturing accessories, the production size can be adjusted by referring to the deflection data line, so as to realize the accurate manufacturing of accessories.

[0003] For the weighing of traditional prefabricated steel bridges to meet the weighing requirements of beam segments of different specifications and weights, a deep foundation pit with a large cross-section needs to be excavated in the existing site, corresponding sensors need to be arranged in the deep foundation pit, and corresponding data dials need to be arranged outside the foundation pit. The beam segments are placed on the sensors for weighing. This weighing method has low weighing accuracy, requires a large site, poor applicability, high weighing cost, low economic efficiency, and cannot measure the camber deflection of beam segments. Summary of the Invention

[0004] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method for weighing and measuring the camber deflection of steel structure bridges, so as to obtain the accurate force conditions of each lifting point and the camber change value under the lifting state, in order to quickly install at the bridge position and improve the on-site erection efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for weighing and measuring the camber deflection of steel structure bridges includes the following steps:

[0007] S1, pre-weighing analysis to determine the force conditions of each lifting point on the steel structure bridge and select the weighing lifting equipment;

[0008] S2, add weight sensors to the weighing lifting equipment and configure digital display devices;

[0009] S3, transport the steel structure bridge to the weighing site;

[0010] S4, arrange camber measurement points on the steel structure bridge;

[0011] S5, arrange steel wire ropes and wireless tension meters;

[0012] S6, lift the steel structure bridge;

[0013] S7, adjust the stress state of the steel structure bridge;

[0014] S8, data collection and analysis.

[0015] Preferably, in step S2, the digital display device is used to display the weight borne by the hook of the weighing and lifting device.

[0016] Preferably, in step S3, when transporting the steel structure bridge, limit blocks are additionally arranged at both sides of the steel structure bridge corresponding to the support base.

[0017] Preferably, in step S4, the camber measurement points are arranged at the central position in the thickness direction of the upper top plate of the steel structure bridge, and then the surface line type of the steel structure bridge is measured.

[0018] Preferably, in step S5, corresponding steel wire ropes are connected to both sides of the wireless tensiometer. Among them, one end of one steel wire rope is connected to the weighing and lifting device, and one end of the other steel wire rope is connected to the camber measurement point on the steel structure bridge;

[0019] The wireless tensiometer is arranged on the steel wire rope with an accuracy of 0.1%.

[0020] Preferably, in step S6, the weighing and lifting device hoists the steel structure bridge to make the steel structure bridge leave the support base;

[0021] The hoisting height of the steel structure bridge does not exceed the height of the limit block.

[0022] Preferably, each of the limit blocks includes a connecting bottom plate, a reaction force vertical plate, a triangular reinforcing rib plate, a limit panel and a shock-absorbing spring;

[0023] The connecting bottom plate is fixed to the support base by bolts;

[0024] The lower end of the reaction force vertical plate is vertically connected to one end of the connecting bottom plate close to the steel structure bridge;

[0025] The triangular reinforcing rib plates are respectively and vertically and centrally connected to the connecting bottom plate and the reaction force vertical plate;

[0026] The limit panel is arranged in parallel with the reaction force vertical plate;

[0027] A plurality of shock-absorbing springs are provided and are evenly arranged between the limit panel and the reaction force vertical plate;

[0028] An anti-collision rubber pad is provided on the contact surface between the limit panel and the steel structure bridge.

[0029] Preferably, in step S7, according to the state of the steel structure bridge leaving the support base, and based on steps S1 and S2, compare the hoisting weight data displayed by the digital display device with the theoretically calculated hoisting force data in the weighing required state, judge and adjust the hoisting posture of the steel structure bridge, and finely adjust the steel structure bridge to make the hoisting weight data.

[0030] Preferably, in step S8, substitute the hoisting weight data, the corresponding temperature, wind speed, and the data of the wireless tension meter into the three-dimensional model to analyze the camber deflection of the steel structure bridge.

[0031] Preferably, before measurement, the steel structure bridge is left stationary to allow its temperature to drop to room temperature.

[0032] A weighing and camber deflection measurement method for a steel structure bridge provided by the present invention has the following beneficial effects:

[0033] (1) High weighing accuracy: The precise force conditions of each lifting point can be obtained, as well as the camber change value in the hoisting state, so as to facilitate rapid installation at the bridge site and improve the on-site erection efficiency;

[0034] (2) High resource utilization rate: When weighing the beam segment and measuring the pre-camber, a large fixed site is not required, and it can be carried out only with mechanical equipment with corresponding lifting equipment;

[0035] (3) Wide applicability and strong practicability. For beam segments of different specifications and weights, only the lifting lugs of the components are needed to complete the weighing and measurement operations;

[0036] (4) High economic benefits: All equipment and instruments can be reused in a cycle. The limit retaining support can effectively reduce the swaying of the beam segment after lifting, maintain stability, and make the measurement data more accurate;

[0037] (5) Achieve precise erection of the bridge site beam segment: Accurately collect and analyze data such as the deflection of the beam segment in advance, which is convenient for precise selection of equipment and reasonable selection;

[0038] (6) Achieve precise manufacturing of accessories: According to the measured surface line type data, adjust the dimensions of the corresponding surface accessories to achieve precise manufacturing of the accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of the preparation stage of the steel structure bridge in the weighing and camber deflection measurement method of the present invention;

[0040] Figure 2 isFigure 1 Side view schematic diagram;

[0041] Figure 3 Is the installation schematic diagram of the limit block in the weighing and camber deflection measurement method of the present invention;

[0042] Figure 4 Is the front view schematic diagram of the limit block in the weighing and camber deflection measurement method of the present invention;

[0043] Figure 5 Is the side view schematic diagram of the limit block in the weighing and camber deflection measurement method of the present invention;

[0044] Figure 6 Is the top view schematic diagram of the limit block in the weighing and camber deflection measurement method of the present invention. Detailed implementation manners

[0045] In order to better understand the above technical solutions of the present invention, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] Combined with Figures 1 to 3 As shown, a weighing and camber deflection measurement method for a steel structure bridge provided by the present invention includes the following steps:

[0047] S1. Pre-weighing analysis: According to the erection state of the steel structure bridge 1 and combined with the equipment situation in the weighing workshop, theoretical analysis is carried out to determine the force conditions of each lifting point on the steel structure bridge 1, and the corresponding weighing and lifting equipment 2 is selected;

[0048] S2. Add a weight sensor to the weighing and lifting equipment 2 and configure a digital display device to observe the hoisting weight data of the weighing and lifting equipment 2;

[0049] S3. Place the steel structure bridge 1 on the support base 3 and transport it to the weighing site;

[0050] S4. Arrange corresponding camber measurement points on the steel structure bridge 1;

[0051] S5. Arrange the steel wire rope and the wireless tension meter 4. Select a wireless tension meter 4 with a suitable range according to the theoretical weight of the steel structure bridge 1, and connect corresponding steel wire ropes on both sides of the wireless tension meter 4. One end of one steel wire rope is connected to the weighing and lifting equipment 2, and the other end of the other steel wire rope is connected to the camber measurement point on the steel structure bridge 1;

[0052] S6. Use the weighing and lifting equipment 2 to lift the steel structure bridge 1 to a certain height so that the steel structure bridge 1 leaves the support base 3;

[0053] S7. Adjust the stress state of the steel structure bridge 1. According to the state of the steel structure bridge 1 leaving the support base 3, adjust the beam segments in real time based on the analysis in step S1 and the real-time data shown in step S2 to approach the stress condition in step S1, so as to achieve the purpose of adjusting the state of the steel structure bridge 1 through the real-time displayed hoisting weight data, in order to facilitate the subsequent measurement of the camber deflection of the steel structure bridge 1.

[0054] S8. Data collection and analysis. Record the hoisting weight data of the weighing and hoisting equipment 2, as well as the corresponding temperature, wind speed, and data of the wireless tension meter.

[0055] In the above step S2, the weight sensor is used to detect the weight borne by the hook 5 of the weighing and hoisting equipment 2 and display it on the digital display device, so as to adjust the posture of the steel structure bridge 1 according to the stress condition. However, when the wireless tension meter 4 is stressed, there is a horizontal separation, and the posture of the steel structure bridge 1 cannot be adjusted according to the reading.

[0056] In the above step S3, when transporting and hoisting the steel structure bridge 1, limit blocks 6 are added at the positions corresponding to both sides of the steel structure bridge 1 on the support base 3 to prevent the steel structure bridge 1 from shaking.

[0057] In the above step S4, the camber measurement points on the steel structure bridge 1 are arranged at the central position in the thickness direction of the upper deck of the steel structure bridge 1 to accurately measure the deflection value and then measure the surface line type of the steel structure bridge, so as to facilitate the adjustment of the production of bridge deck accessories and the high-precision installation of accessories.

[0058] In the above step S5, the accuracy of the wireless tension meter 4 is 0.1% to ensure the accuracy of the measurement. After the steel wire rope and shackle are hung, the value of the wireless tension meter 4 must be cleared.

[0059] In the above step S6, the weighing and hoisting equipment 2 hoists the steel structure bridge 1 to make the steel structure bridge 1 leave the support base 3, and the hoisting height of the steel structure bridge 1 does not exceed the height of the limit block 6. After the lifting height meets the requirements, install the limit block 6 according to the actual position of the steel structure bridge 1 to fix the position of the steel structure bridge 1 and prevent it from shaking, which is convenient for measurement.

[0060] In the above step S7, compare the hoisting weight data displayed on the digital display device with the theoretically calculated hoisting force data in the weighing requirement state, judge and adjust the hoisting posture of the steel structure bridge 1, and finely adjust the steel structure bridge 1 to make the hoisting weight data close to or equal to the theoretically calculated hoisting force data in the weighing requirement state to ensure that the steel structure bridge 1 reaches the weighing state for the precise erection of the steel structure bridge 1. Generally, the deviation of the component force from the theoretical calculation in the hoisting weight data is controlled within ±100 kg, and the deviation of the resultant force from the theoretical calculation is controlled within ±150 kg.

[0061] In the above-mentioned step S8, in order to eliminate the influence of temperature on the measurement error, before measurement, the steel structure bridge 1 is left static for a period of time to ensure that the self-temperature of the steel structure bridge 1 is consistent with the ambient temperature of the measurement workshop, and at the same time, the steel structure bridge 1 is basically in a static state. Finally, the hoisting weight data and the corresponding temperature, wind speed, and data of the wireless tensiometer are all substituted into the three-dimensional model to analyze the camber deflection of the steel structure bridge 1. Specifically: Set up a virtual coordinate system in the three-dimensional software, place the entire steel structure bridge 1 in the virtual coordinate system, and establish a full-bridge model. The Z-axis is the elevation direction, the X-axis is the bridge length direction, and the Y-axis is the width direction. Select a reference benchmark point on the steel structure bridge 1, use a plane parallel to the Y-axis to intersect the component, and obtain the relative coordinate values (coordinates relative to the benchmark point) of the corresponding control points X, Y, and Z, and generate a coordinate data table. When measuring, the selected benchmark point (consistent with the point selected in the model) is also used as the benchmark point for measurement in sequence. Compare the measured coordinate data with the theoretical coordinate data.

[0062] Combined with Figures 4 to Figure 6 As shown, the limit stop blocks 6 all include a connecting bottom plate 11, a reaction force vertical plate 12, a triangular reinforcing rib plate 13, a limit panel 15, and a shock-absorbing spring 14.

[0063] The connecting bottom plate 11 is fixed to the support base 3 by bolts.

[0064] The lower end of the reaction force vertical plate 12 is vertically connected to one end of the connecting bottom plate 11 close to the steel structure bridge 1, and the ends are flush.

[0065] The triangular reinforcing rib plates 13 are respectively and perpendicularly centeredly connected to the connecting bottom plate 11 and the reaction force vertical plate 12.

[0066] The limit panel 15 is arranged parallel to the reaction force vertical plate 12.

[0067] A plurality of shock-absorbing springs 14 are provided and are evenly connected between the limit panel 15 and the reaction force vertical plate 12.

[0068] An anti-collision rubber pad 16 is arranged on the contact surface between the limit panel 15 and the steel structure bridge 1.

[0069] The bolt holes on the connecting bottom plate 11 are set as waist-shaped holes, and can be installed according to the actual hoisting position during installation, with higher applicability.

[0070] The shock-absorbing springs 14 need to be of the same model to ensure that the compression amounts are consistent, and when installed, the relative deviation of the plane elevation in the free state on the other side after one side is fixed needs to be controlled within 2 mm, so that all the shock-absorbing springs 14 can better bear the force.

[0071] The anti-collision rubber pad 16 can effectively prevent the direct contact between the steel structure bridge 1 and the limit panel 15, thus preventing damage to the surface of the steel structure bridge 1.

[0072] Embodiment

[0073] This embodiment provides a method for weighing and measuring the camber deflection of a steel structure bridge, including the following steps:

[0074] S1. Place the steel structure bridge 1 on the support base 3 and use a transfer device to transfer it under the weighing and lifting equipment 2. Use a double hook head for hoisting and weighing, and suspend the weight sensor and steel wire rope. Let it stand for 2 hours to ensure that the self-temperature of the steel structure bridge 1 is consistent with the ambient temperature of the measurement workshop. Measure the camber value of the steel structure bridge 1. When measuring, record the temperature and wind speed, as Figure 1 and Figure 2 shown.

[0075] S2. Slowly lift the steel structure bridge 1 about 100 mm away from the support base 3. To avoid the shaking of the steel structure bridge 1, the wind force during hoisting should be ≤ 4 levels, and the lifting height should not exceed the height of the limit blocks 6 on both sides of the steel structure bridge 1. Stay for 5 minutes and observe whether there are any abnormalities in the weighing and lifting equipment 2, the steel structure bridge 1 and related components, etc. If there are any abnormal phenomena, stop hoisting until there are no abnormalities before proceeding with the subsequent measurement work. After the hoisting is completed, the steel structure bridge 1 needs to stand still for 15 minutes, as Figure 3 shown.

[0076] S3. Use a total station to measure the camber of the steel structure bridge 1 in the hoisting state according to the arranged camber measurement points. When measuring, record the corresponding temperature and wind speed. Compare and analyze with the theoretical data, adjust the attitude of the steel structure bridge 1, and wait until the steel structure bridge 1 is stable before measuring.

[0077] S4. After all the measurements are completed, place the steel structure bridge 1 on the original gantry shelf and remove the sling. Substitute the measurement data into the three-dimensional model to analyze the overall deflection of the beam segment.

[0078] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as within the scope of the substantial spirit of the present invention, the changes and modifications of the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for weighing and measuring the camber deflection of a steel structure bridge, characterized in that, It includes the following steps: S1. Conduct pre - weighing analysis to determine the force conditions of each lifting point on the steel - structure bridge, and select the weighing and lifting equipment. S2. Add weight sensors to the weighing and lifting equipment and configure digital display devices. S3. Transport the steel - structure bridge to the weighing site. S4. Arrange camber measurement points on the steel - structure bridge. S5. Arrange steel ropes and wireless tension meters. S6. Lift the steel - structure bridge. S7. Adjust the force state of the steel - structure bridge. S8. Collect and analyze data.

2. The weighing and camber deflection measurement method for steel structure bridges according to claim 1, wherein: In step S2, the digital display device is used to display the weight borne by the hook of the weighing and lifting equipment.

3. The weighing and camber deflection measurement method for steel structure bridges according to claim 1, characterized in that: In step S3, when transporting the steel - structure bridge, limit blocks are additionally arranged at both sides corresponding to the steel - structure bridge on the support base.

4. The weighing and camber deflection measurement method for steel structure bridges according to claim 1, wherein: In step S4, the camber measurement points are arranged at the central position in the thickness direction of the upper plate of the steel - structure bridge, and then the surface line type of the steel - structure bridge is measured.

5. The weighing and camber deflection measurement method for a steel structure bridge according to claim 1, wherein: In step S5, corresponding steel ropes are connected to both sides of the wireless tension meter. One end of one steel rope is connected to the weighing and lifting equipment, and one end of the other steel rope is connected to the camber measurement point on the steel - structure bridge. The wireless tension meter is arranged on the steel rope with an accuracy of 0.1%.

6. The weighing and camber deflection measurement method for a steel structure bridge according to claim 3, wherein: In step S6, the weighing and lifting equipment lifts the steel - structure bridge to make the steel - structure bridge leave the support base. The lifting height of the steel - structure bridge does not exceed the height of the limit blocks.

7. The weighing and camber deflection measurement method for steel structure bridges according to claim 6, characterized in that: The limit blocks each include a connecting bottom plate, a reaction vertical plate, a triangular reinforcing rib plate, a limit panel and a shock - absorbing spring. The connecting bottom plate is fixed to the support base by bolts. The lower end of the reaction vertical plate is vertically connected to one end of the connecting bottom plate close to the steel - structure bridge. The triangular reinforcing rib plates are respectively and perpendicularly and centrally connected to the connecting bottom plate and the reaction vertical plate. The limit panel is arranged parallel to the reaction vertical plate. A plurality of shock - absorbing springs are evenly arranged between the limit panel and the reaction vertical plate. An anti - collision rubber pad is arranged on the contact surface between the limit panel and the steel - structure bridge.

8. The weighing and camber deflection measurement method for steel structure bridges according to claim 6, wherein: In step S7, according to the state of the steel - structure bridge leaving the support base, compare the hoisting weight data displayed by the digital display device with the theoretically calculated hoisting force data in the weighing - required state according to steps S1 and S2, judge and adjust the hoisting posture of the steel - structure bridge, and finely adjust the steel - structure bridge to make the hoisting weight data close to or equal to the theoretically calculated hoisting force data in the weighing - required state.

9. The method for weighing and measuring the camber deflection of a steel structure bridge according to claim 8, characterized in that: In step S8, substitute the hoisting weight data, the corresponding temperature, wind speed and the data of the wireless tension meter into the 3D model to analyze the camber deflection of the steel - structure bridge.

10. The weighing and camber deflection measurement method for steel structure bridges according to claim 9, characterized in that: Before measurement, the steel - structure bridge is left static to cool its temperature to room temperature.

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