Bridge construction monitoring method, system and equipment based on bridge deflection

Abstract

The invention relates to the technical field of electronic digital data processing, in particular to a bridge construction monitoring method, system and equipment based on bridge deflection, and the method comprises the steps: obtaining the final height of each bridge tower after settlement and the geometric information of each sling before settlement of each bridge tower, and obtaining the final height of each sling according to the final height and the geometric information; determining the indirect sinkage of each sling caused by the settlement of the bridge tower and the deflection increment factor of the corresponding bridge floor position of each sling, and determining the tension increment of each sling after the settlement of the bridge tower according to the deflection increment factor of the corresponding bridge floor position of each sling; according to the indirect sinking amount of each sling caused by bridge tower settlement and the tension increment of each sling after bridge tower settlement, the target shortening length of each sling is determined, so that the length of the corresponding sling is shortened in the bridge construction process, bridge tension unbalance caused by bridge tower settlement is made up, the stability of the bridge in the long-term use process is ensured, and the construction efficiency is improved. And effective monitoring of bridge construction is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic digital data processing, and specifically relates to a bridge construction monitoring method, system and equipment based on bridge deflection. Background Art

[0002] Deflection is an important indicator reflecting the stress and deformation of a bridge. It is closely related to the bearing capacity, service performance and structural stability of the bridge. Especially during the construction process, the deflection change of the bridge can directly reflect whether the stress of the bridge is uniform, whether there is abnormal settlement or structural deformation, and thus provide a strong basis for the construction safety of the bridge. Therefore, monitoring the construction based on bridge deflection can timely detect potential problems during the construction process, ensure the construction quality of the bridge, and provide a basis for safety assessment during long-term operation.

[0003] Currently, during the design and construction of a suspension bridge, generally, the combination of bridge towers and suspension cables is used to transfer the loads at different positions of the bridge and reduce the deflection deformation. However, the construction position of the bridge tower may undergo vertical settlement due to factors such as changes in the groundwater level or geological conditions, resulting in a decrease in the tension of the suspension cables and a change in deflection, leading to an imbalance in the stress of the bridge. And simply strengthening the bridge tower pile foundation cannot cope with long-term geological soil changes, thus affecting the overall stability of the bridge. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a bridge construction monitoring method, system and equipment based on bridge deflection. The specific technical solutions adopted are as follows: In the first aspect, an embodiment of the present application provides a bridge construction monitoring method based on bridge deflection, including: Obtaining the final height of each bridge tower after settlement and the geometric information of each suspension cable before settlement of each bridge tower; According to the final height and the geometric information, determining the indirect settlement amount of each suspension cable caused by the settlement of the bridge tower and the deflection increment factor of the corresponding bridge deck position of each suspension cable; According to the deflection increment factor of the corresponding bridge deck position of each suspension cable, determining the tension increment of each suspension cable after the settlement of the bridge tower; According to the indirect settlement amount of each suspension cable caused by the settlement of the bridge tower and the tension increment of each suspension cable after the settlement of the bridge tower, determining the target shortening length of each suspension cable; the target shortening length is used to shorten the length of the corresponding suspension cable during the bridge construction process.

[0005] In an implementation manner, the geometric information includes the position and the first height; the determining the indirect settlement amount of each suspension cable caused by the settlement of the bridge tower according to the final height and the geometric information includes: Determine the target suspension cable equation corresponding to the settlement of at least one pylon according to the standard suspension cable equation and the final height; Determine the second height of each sling corresponding to the pylon settlement according to the target suspension cable equation and the position, and respectively determine the indirect settlement amount of each sling caused by the pylon settlement according to the difference between the first height and the second height.

[0006] In one embodiment, the geometric information includes the horizontal distances between each sling and each pylon; determining the deflection increment factor of each sling corresponding to the bridge deck position according to the final height and the geometric information includes: Determine the first pylon with the largest settlement degree among the pylons and the second pylon other than the first pylon; Determine the first ratio of the final height of the first pylon to the final height of the second pylon, and the absolute value of the difference between the first ratio and a preset value; Determine the target horizontal distance between each sling and the first pylon according to the horizontal distances between each sling and each pylon, and respectively determine the deflection increment factor of each sling corresponding to the bridge deck position according to the first product of the target horizontal distance and the absolute value.

[0007] In one embodiment, the determining the tension increment of each sling after the pylon settlement according to the deflection increment factor of each sling corresponding to the bridge deck position includes: Obtain the initial tension values of each sling before the pylon settlement and the initial deflections at the corresponding positions of each sling; Respectively determine the sum value of the deflection increment factor of each sling corresponding to the bridge deck position and a preset value, and respectively determine the second product of the sum value and each initial deflection; Respectively determine the second ratio of the second product to the initial deflection at the corresponding position of each sling, and respectively obtain the final tension value of each sling after the pylon settlement according to the third product of the second ratio and the initial tension value; Respectively determine the tension increment of each sling after the pylon settlement according to the difference between the final tension value and the initial tension value.

[0008] In one embodiment, the geometric information includes the initial length; the determining the target shortening length of each sling according to the indirect settlement amount of each sling caused by the pylon settlement and the tension increment of each sling after the pylon settlement includes: Determine the length reduction amount of each sling after the pylon settlement according to the initial length, the initial tension value and the tension increment of each sling after the pylon settlement; Determine the target shortening length of each sling according to the indirect settlement amount of each sling caused by the settlement of the bridge tower and the length reduction amount of each sling.

[0009] In one embodiment, the determining the length reduction amount of each sling after the settlement of the bridge tower according to the initial length, the initial tension value and the tension increment of each sling after the settlement of the bridge tower includes: Respectively determine the third ratio of the tension increment of each sling after the settlement of the bridge tower to the initial tension value; Respectively determine the length reduction amount of each sling after the settlement of the bridge tower according to the fourth product of the third ratio and the initial length.

[0010] In one embodiment, the determining the target shortening length of each sling according to the indirect settlement amount of each sling caused by the settlement of the bridge tower and the length reduction amount of each sling includes: Respectively compare the indirect settlement amount of each sling caused by the settlement of the bridge tower with the length reduction amount of each sling; When the indirect settlement amount is equal to the length reduction amount, take the length reduction amount as the target shortening length of the sling; When the indirect settlement amount is greater than the length reduction amount, take the indirect settlement amount as the target shortening length of the sling; When the indirect settlement amount is less than the length reduction amount, analyze the maximum allowable elongation of the sling to determine the target shortening length of the sling.

[0011] In one embodiment, the when the indirect settlement amount is less than the length reduction amount, analyzing the maximum allowable elongation of the sling to determine the target shortening length of the sling includes: When the indirect settlement amount is less than the length reduction amount, obtain the cross-sectional area of the sling and the elastic modulus of the material; Determine the fifth product of the initial length and the initial tension value of the sling and the sixth product of the cross-sectional area and the elastic modulus of the material of the sling, and determine the maximum allowable elongation of the sling according to the fourth ratio of the fifth product to the sixth product; When the maximum allowable elongation of the sling is greater than the corresponding length reduction amount, take the indirect settlement amount of the sling as the target shortening length of the sling, and when the maximum allowable elongation of the sling is less than or equal to the corresponding length reduction amount, take the difference between the corresponding length reduction amount and the maximum allowable elongation of the sling as the target shortening length of the sling.

[0012] In a second aspect, an embodiment of the present application provides a bridge construction monitoring system based on bridge deflection, including: In a third aspect, an embodiment of the present application provides an electronic device, including: a processor and a memory. Instructions are stored in the memory and loaded and executed by the processor to implement the method in any one of the above aspects.

[0013] The present invention has the following beneficial effects: By obtaining the final height of each pylon after settlement and the geometric information of each sling before settlement of each pylon, according to the final height and the geometric information, determining the indirect settlement amount of each sling caused by the settlement of the pylon and the deflection increment factor of the position of each sling corresponding to the bridge deck, according to the deflection increment factor of the position of each sling corresponding to the bridge deck, determining the tension increment of each sling after the settlement of the pylon, according to the indirect settlement amount of each sling caused by the settlement of the pylon and the tension increment of each sling after the settlement of the pylon, determining the target shortening length of each sling, and determining the target shortening length based on the analysis of the deflection increment factor and the tension increment, so as to shorten the length of the corresponding sling during the bridge construction process, make up for the imbalance of the bridge tension caused by the settlement of the pylon, ensure the stability during the long-term use of the bridge, and realize the effective monitoring of the bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic flowchart of the steps of a bridge construction monitoring method based on bridge deflection provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a bridge provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of a standard catenary model provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the maximum allowable elongation of a sling provided by an embodiment of the present invention; Figure 5 It is a schematic block diagram of a bridge construction monitoring system based on bridge deflection provided by an embodiment of the present invention; Figure 6 It is a structural block diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and effects of the bridge construction monitoring method, system, and equipment based on bridge deflection proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs.

[0018] It should be noted that the "exemplary" in the embodiments of this application refers to examples listed for convenience of explanation, and other embodiments are not limited to the examples listed.

[0019] The following specifically describes the specific solutions of the bridge construction monitoring method, system, and equipment based on bridge deflection provided by the present invention in conjunction with the accompanying drawings.

[0020] Please refer to Figure 1 , which shows a flowchart of a bridge construction monitoring method based on bridge deflection provided by an embodiment of the present invention. The bridge construction monitoring method based on bridge deflection may at least include steps S100 - S400: S100. Obtain the final height of each pylon after settlement and the geometric information of each sling before settlement of each pylon.

[0021] S200. Determine the indirect settlement amount of each sling caused by pylon settlement and the deflection increment factor at the position of the corresponding bridge deck for each sling according to the final height and geometric information.

[0022] S300. Determine the tension increment of each sling after pylon settlement according to the deflection increment factor at the position of the corresponding bridge deck for each sling.

[0023] S400. Determine the target shortening length of each sling according to the indirect settlement amount of each sling caused by pylon settlement and the tension increment of each sling after pylon settlement; the target shortening length is used to shorten the length of the corresponding sling during the bridge construction process.

[0024] In the technical solution of the embodiment of the present application, by obtaining the final height of each bridge tower after settlement and the geometric information of each sling before settlement of each bridge tower, according to the final height and the geometric information, the indirect settlement amount of each sling caused by the settlement of the bridge tower and the deflection increment factor of the corresponding bridge deck position of each sling are determined. According to the deflection increment factor of the corresponding bridge deck position of each sling, the tension increment of each sling after the settlement of the bridge tower is determined. According to the indirect settlement amount of each sling caused by the settlement of the bridge tower and the tension increment of each sling after the settlement of the bridge tower, the target shortening length of each sling is determined. The target shortening length is determined based on the analysis of the deflection increment factor and the tension increment, so as to shorten the length of the corresponding sling during the bridge construction process, make up for the imbalance of the bridge tension caused by the settlement of the bridge tower, ensure the stability during the long-term use of the bridge, and realize the effective monitoring of the bridge construction.

[0025] As Figure 2 shown, the bridge in the embodiment of the present application takes a suspension bridge as an example. A suspension bridge generally includes bridge towers (exemplarily described by taking the first bridge tower 11 and the second bridge tower 12 as an example, and the number of bridge towers is not specifically limited in other embodiments), slings 2, main cables 3, a bridge deck 4, etc. A suspension bridge is a bridge with a cable (or steel chain) suspended and anchored at both banks (or both ends of the bridge) by bridge towers as the main load-bearing member of the superstructure. Specifically, the main cable 3 extends from the support points at both ends (usually bridge towers or brackets) to the middle of the bridge. The height of the bridge tower determines how the vertical tension of the main cable 3 is transmitted to the sling 2. The support of the bridge tower causes the main cable 3 to sag from the support points at both ends and is transmitted to the bridge deck 4 through the sling 2. Since the main cable 3 is in a parabolic or approximately parabolic shape, the tension of the main cable 3 is larger in the central region and smaller in the region near the bridge tower. Generally, during the design and construction process of a suspension bridge, the construction sequence is as follows: foundation construction Construction of the main cable and slings Installation of traffic facilities. After the construction of the bridge tower is completed, due to the load effect, the foundation soil will be gradually compacted, and settlement of the bridge tower foundation and other components may occur. The settlement of the foundation will cause the bridge tower to settle, affecting the height of the bridge tower and the subsequent connection between the sling and the bridge deck, and further affecting the force distribution and overall stability of the bridge.

[0026] Therefore, in the embodiment of the present application, relevant data can be obtained based on the BIM design model of the bridge established before the bridge construction (such as the initial height of the bridge tower before settlement, the geometric information of each sling before settlement of each bridge tower), and the settlement-related data of the bridge tower measured after the construction is completed (such as the final height of the bridge tower after settlement). Optionally, the geometric information of each sling before settlement of each bridge tower includes but is not limited to position, first height, the horizontal distance between each sling and each bridge tower, and initial length. It should be noted that Figure 2In it, X is the horizontal direction, Y is the height direction, and the length of the sling refers to the distance between the two ends of the sling in the height direction Y.

[0027] It should be noted that since the settlement of the bridge tower will affect the connection length and tension between the sling and the bridge deck, and further affect the force distribution of the bridge, therefore, first calculate the indirect settlement amount of different sling positions of this bridge, and then determine the tension increment of the sling by analyzing the settlement situation of the bridge tower and the relationship between the tension and the bridge deflection at different sling positions. Furthermore, based on the tension increment of different slings and the indirect settlement amount, adjust the lengths of slings at different positions. Among them, if the height of the bridge deck corresponding to the settlement of the bridge tower will shift, it is necessary to appropriately reduce the length of the sling to keep the position of the bridge deck unchanged.

[0028] In one implementation, step S200 determines the indirect settlement amount of each sling due to the settlement of the bridge tower according to the final height and geometric information, including steps S201 - S202: S201. According to the standard catenary equation and the final height, determine the target catenary equation corresponding to the settlement of at least one bridge tower.

[0029] In the embodiment of the present application, taking the example of including the first bridge tower 11 and the second bridge tower 12, it is possible that both bridge towers have settled and the settlement heights may be different. Since the main cable 3 is in the shape of a catenary, it cannot be considered that the sinking height of the bridge tower is equal to the descending height of the sling. Therefore, an unequal height catenary model is introduced for analysis, as Figure 3 shown, which is a schematic diagram of the standard catenary model. The horizontal axis is the position of the sling (equivalent to the coordinate in the horizontal direction), and the vertical axis is the height corresponding to the sling. Assume that when the first bridge tower 11 and the second bridge tower 12 at both ends have different degrees of settlement, because the height change of each bridge tower will affect the shape of the entire catenary, and further affect the descending height of each sling. Therefore, a target catenary equation is constructed based on the standard catenary equation. For example, the target catenary equation is an unequal height catenary model (if the first bridge tower 11 and the second bridge tower 12 have the same degree of settlement, it is also applicable).

[0030] Specifically, assume that the first bridge tower 11 and the second bridge tower 12 at both ends have not settled and support the sling at the same height. The corresponding standard catenary equation is: , where is the height of the sling at the position , is the tension at both ends of the catenary (main cable), is the gravity of the main cable per unit length, is the scale factor, which determines the shape and tension distribution of the catenary, is the hyperbolic cosine function. Assume that the original height before the settlement of the two bridge towers is and the two pylons have each descended by a different height and , the final height of the first pylon 11 is = , and the final height of the second pylon 12 is = . When the two pylons settle, the vertical height of the entire catenary will be affected by the combined settlement of the two pylons and needs to be processed in segments: In the order from the first pylon 11 to the second pylon 12, there is: ; In the order from the second pylon 12 to the first pylon 11, there is: , is the horizontal distance between the first pylon 11 and the second pylon 12. Among them, and represent the scale factors of the first pylon 11 and the second pylon 12 respectively. The scale factor and will be adjusted according to the settlement of the first pylon 11 and relevant physical parameters. Usually, the pylon with a larger settlement will cause the scale factor to increase.

[0031] Assuming that the shape near the pylon does not change drastically and can be approximated that the entire system is a single catenary, then the influence of the height difference between the two pylons on the shape of the suspension cable can be superimposed. The corresponding target suspension cable chain equation after at least one pylon has settled can be expressed as: where, is the height of the sling at position . Since and represent the local scale factors of the above segmented catenary equation, so this is the scale factor (overall) in the standard catenary equation.

[0032] S202. According to the target suspension cable chain equation and the position, determine the second height of each sling corresponding to the settlement of the pylon, and respectively determine the indirect settlement amount of each sling caused by the settlement of the pylon according to the difference between the first height and the second height.

[0033] Optionally, after determining the target suspension cable chain equation, substitute the position of each sling into the of the target suspension cable chain equation respectively, so as to obtain the of each sling, that is, the second height of each sling corresponding to the settlement of the pylon, denoted as , that is, the second height of the th sling. Then, respectively according to the first height (i.e., the height of the th sling before the settlement of the bridge tower) and the difference from the second height , to determine the indirect settlement amount of each sling caused by the settlement of the bridge tower : In the formula, is the indirect settlement amount of the th sling caused by the settlement of the bridge tower. represents the influence of the settlement of the first bridge tower 11 and the second bridge tower 12 on the heights of different slings. Subsequently, the sling lengths can be adjusted based on this height influence to ensure the smoothness of the bridge deck.

[0034] It should be noted that generally during the bridge modeling process, the lengths of different slings and their tensions on the bridge deck have been accurately simulated and verified. If the bridge tower undergoes settlement, on the one hand, it will cause the slings to sink and affect the designed position of the bridge deck. At the same time, the geometric changes caused by the settlement of the bridge tower will change the force distribution of the slings and also change the tension of the bridge deck on the slings, making the original simulation results no longer applicable. Therefore, it is necessary to analyze the force changes of different slings and make adaptive adjustments to the sling lengths. In the embodiments of the present application, the forces in the vertical direction of the bridge deck are analyzed. Generally, the bridge deck is subjected to the tension from the slings and the gravity of its own load. The influence of the load gravity on the bridge deck is mainly in terms of deflection, that is, the magnitude of the tension of the slings is reflected in the slings overcoming the deflection of the bridge deck. If the two bridge towers undergo different degrees of settlement and there is a height difference, then the tensions of the slings at different positions and the deflection of the bridge deck will change accordingly. To keep the bridge deck smooth, it is necessary to adjust the lengths of the slings to maintain the original tension situation. For example, if the settlement height (which can also be called the degree) of the first bridge tower is more than that of the second bridge tower, then the first bridge tower is relatively lower than the second bridge tower. The slings of the first bridge tower will pull the bridge deck more loosely compared to the slings of the second bridge tower, which will cause a significant increase in the deflection of the bridge deck at the first bridge tower, and the degree of increase in deflection will gradually become smaller towards the second bridge tower. At the same time, the greater the final height difference between the first bridge tower and the second bridge tower, the greater the degree of change in deflection, and vice versa.

[0035] In one implementation manner, step S200 determines the deflection increment factor corresponding to the bridge deck position of each sling according to the final height and geometric information, including steps S203 - S205: S203. Determine the first bridge tower with the largest settlement degree and the second bridge tower other than the first bridge tower from the bridge towers.

[0036] For example, in the embodiments of the present application, the bridge tower with the largest settlement degree is used as the first bridge tower, and the remaining bridge towers are used as the second bridge tower, as Figure 2 shown.

[0037] S204. Determine the first ratio of the final height of the first bridge tower to the final height of the second bridge tower, and the absolute value of the difference between the first ratio and a preset value.

[0038] Optionally, determine the final height of the first bridge tower and the final height of the second bridge tower of the first ratio , and the first ratio and the absolute value of the difference between the preset value (exemplarily 1) .

[0039] S205. According to the horizontal distances between each sling and each bridge tower, determine the target horizontal distance between each sling and the first bridge tower, and respectively determine the deflection increment factor of the bridge deck position corresponding to each sling according to the first product of the target horizontal distance and the absolute value.

[0040] In the embodiment of the present application, according to the horizontal distances between each sling and each bridge tower, determine the target horizontal distance between each sling and the first bridge tower , that is, the target horizontal distance between the th sling and the first bridge tower, and respectively determine the deflection increment factor of the bridge deck position corresponding to each sling according to the first product of the target horizontal distance and the absolute value: In the formula, is the deflection increment factor of the bridge deck position corresponding to the th sling. is the position (the position of the bridge deck corresponding to the th sling), is the position of the first bridge tower; The smaller the value, the closer it is to the first bridge tower, the looser the sling, and the greater the deflection increment of the corresponding position of the bridge deck. Conversely, the smaller the value; at the same time is the height difference between the first bridge tower and the second bridge tower, representing the inclination degree of the bridge deck. The lower side of the bridge deck is more affected by the load gravity, and the corresponding deflection change is greater, and the result is normalized to the range of [0, 1].

[0041] It should be noted that at a certain position on the bridge deck, if the deflection increment factor is larger, it means that the deflection increase degree at this position is larger, and vice versa; for the bridge deck, since the tension of the sling acting on it is upward and the load gravity corresponding to the deflection is downward, and the different degrees of settlement of the two bridge towers will cause the deflection of the bridge deck to increase, that is, the downward trend force of the bridge deck increases and the tension is lost. To balance this trend, it is necessary to increase the upward sling tension, and the increment of the deflection is equal to the increment of the sling tension.

[0042] In one embodiment, step S300 includes steps S301 - S304: S301. Obtain the initial tension values of each sling before the pylon settlement and the initial deflections at the corresponding positions of each sling.

[0043] Optionally, obtain the initial tension values of each sling before the pylon settlement and the initial deflections at the corresponding positions of each sling , i.e., the initial tension value of the th sling before the pylon settlement, i.e., the initial deflection at the corresponding position of the th sling before the pylon settlement; wherein, the methods for obtaining the initial tension values and the initial deflections can be based on existing methods and will not be elaborated here.

[0044] S302. Respectively determine the sum of the deflection increment factor at the bridge deck position corresponding to each sling and a preset value, and respectively determine the second product of the sum and each initial deflection.

[0045] Optionally, respectively determine the deflection increment factor at the bridge deck position corresponding to each sling and the sum with a preset value (exemplarily 1) , and respectively determine the second product of the sum and each initial deflection . .

[0046] S303. Respectively determine the second ratio of the second product to the initial deflection at the corresponding position of each sling, and respectively obtain the final tension value of each sling after the pylon settlement according to the third product of the second ratio and the initial tension value.

[0047] Optionally, respectively determine the second product and the second ratio of the second product to the initial deflection at the corresponding position of each sling , which represents the degree of deflection increase at the bridge deck position corresponding to the th sling, and at the same time respectively obtain the final tension value of each sling after the pylon settlement according to the third product of the second ratio and the initial tension value : wherein, is the final tension value of the th sling after the pylon settlement.

[0048] S304. Respectively determine the tension increment of each sling after the pylon settlement according to the difference between the final tension value and the initial tension value.

[0049] Optionally, respectively according to the final tension value The difference from the initial tension value to determine the tension increment of each sling after the pylon settlement , that is, the tension increment of the th sling after the pylon settlement

[0050] In one embodiment, step S400 includes steps S401 - S402: S401. Determine the length reduction of each sling after the pylon settlement according to the initial length, the initial tension value, and the tension increment of each sling after the pylon settlement

[0051] It should be noted that if the above-mentioned settlement occurs in the pylon, the tensions of different slings change. Therefore, in order to maintain the balance between the bridge deck tension and the load gravity, it is necessary to adjust the tensions of the slings. Generally, the tension adjustment of the slings is reflected in the change of their lengths. If it is necessary to increase the tension of the corresponding sling, the length of the sling needs to be shortened, which can make the sling more taut and thus increase the tension of the sling. The greater the tension increment of the sling, the greater the shortening degree of the corresponding sling. Therefore, for any sling, its length reduction can be determined based on the following steps: Respectively determine the tension increment of each sling after the pylon settlement and the initial tension value of the third ratio . Respectively, according to the fourth product of the third ratio and the initial length (the initial length of the th sling), determine the length reduction of each sling after the pylon settlement: wherein, is the length reduction of the th sling after the pylon settlement

[0052] S402. Determine the target shortening length of each sling according to the indirect settlement amount of each sling caused by the pylon settlement and the length reduction of each sling

[0053] First, respectively compare the indirect settlement amount of each sling caused by the pylon settlement with the length reduction of each sling

[0054] Second, when the indirect settlement amount is equal to the length reduction , it indicates that the increase in tension caused by the indirect settlement amount of the sling due to the pylon settlement just compensates for the tension loss caused by the change in the bridge deck force. Then, the length reduction As the target shortening length of the sling, that is, the length reduction As the reduction in the length of the corresponding sling.

[0055] Then, when the indirect settlement is greater than the length reduction , it indicates that the degree of increase in tension caused by the indirect settlement of the sling due to the settlement of the pylon exceeds the amount of tension loss caused by the change in the force on the bridge deck. Since the material of the bridge deck sling will age during long-term use and the tension will gradually decrease, a large tension is not harmful to the long-term use of the bridge deck. Therefore, taking the indirect settlement as the target shortening length of the sling, that is, the indirect settlement as the reduction in the length of the corresponding sling, the adjustment is feasible.

[0056] Finally, when the indirect settlement is less than the length reduction , it means that the degree of increase in tension caused by the indirect settlement of the sling due to the settlement of the pylon has not reached the amount of tension loss caused by the change in the force on the bridge deck. Then, adjusting the length of the sling based on any length reduction will result in an unreliable bridge deck structure. Based on the above situation, it is necessary to find an optimal point with accurate bridge deck position and force balance. For example, it is desired to determine an optimal reduction length to maintain the horizontal position of the bridge deck unchanged while maintaining force balance as much as possible. Since the sling generally uses flexible materials and can be stretched appropriately, it is necessary to determine the maximum allowable elongation of this sling while keeping the tension unchanged. Specifically, it includes steps 1 - step 3: Step 1: When the indirect settlement is less than the length reduction , obtain the cross-sectional area of the sling (i.e., the cross-sectional area of the th sling) and the elastic modulus of the material; the obtaining method is an existing method and will not be elaborated.

[0057] As shown in Figure 4 , Step 2: Determine the fifth product of the initial length of the sling (i.e., the initial length of the th sling) and the initial tension value (i.e., the initial tension value of the th sling ), and the sixth product of the cross-sectional area of the sling and the elastic modulus of the material, and determine the maximum allowable elongation of the sling according to the fourth ratio of the fifth product and the sixth product: In the formula, is the maximum allowable elongation of the th sling when the tension remains unchanged.

[0058] Step 3: When the maximum allowable elongation of the sling is greater than the corresponding length reduction, the indirect settlement of the sling is used as the target shortening length of the sling. When the maximum allowable elongation of the sling is less than or equal to the corresponding length reduction, the difference between the corresponding length reduction and the maximum allowable elongation of the sling is used as the target shortening length of the sling.

[0059] It should be noted that if the maximum allowable elongation of the sling is larger, it means that the length that can be stretched under the corresponding tension is longer, that is, this stretched length will offset more and differences, achieving the purpose of keeping the bridge deck as horizontal as possible. Therefore, when the maximum allowable elongation of the sling is less than or equal to the corresponding length reduction (the length reduction of the th sling), the difference between the corresponding length reduction and the maximum allowable elongation of the sling is used as the target shortening length of the sling, that is, the target shortening length of the th sling is . And because there may be a situation where the maximum allowable elongation of the sling is greater than the corresponding length reduction , it means that the elasticity of this sling is excellent, so directly use the corresponding (the indirect settlement of the th sling) as the target shortening length of the sling.

[0060] In the embodiment of the present application, by calculating the indirect settlement at different sling positions of the bridge after the tower settlement, the relationship between the tension and the bridge deflection at different sling positions to determine the tension increment of the sling, so as to determine the target shortening length of each sling. Therefore, when constructing the main cable and the sling after the tower construction is completed, the corresponding sling length can be reduced and optimized based on the target shortening length of the sling, thus making up for the imbalance of the bridge tension caused by the tower settlement, ensuring the stability of the bridge during long-term use, and realizing effective bridge construction monitoring.

[0061] Referring to Figure 5 , a structural block diagram of a bridge construction monitoring system based on bridge deflection according to an embodiment of the present application is shown. The system may include: An acquisition module, configured to acquire the final height of each tower after settlement and the geometric information of each sling before settlement of each tower; A first determination module, configured to determine an indirect settlement amount of each sling caused by the settlement of the bridge tower and a deflection increment factor of the corresponding bridge deck position of each sling according to the final height and geometric information; A second determination module, configured to determine a tension increment of each sling after the settlement of the bridge tower according to the deflection increment factor of the corresponding bridge deck position of each sling; A third determination module, configured to determine a target shortening length of each sling according to the indirect settlement amount of each sling caused by the settlement of the bridge tower and the tension increment of each sling after the settlement of the bridge tower; the target shortening length is used to shorten the length of the corresponding sling during the bridge construction process.

[0062] In the embodiments of the present application, the functions of the modules in the system can be referred to the corresponding descriptions in the above method, and will not be elaborated here.

[0063] Refer to Figure 6 , in an implementation manner, the embodiments of the present application further provide an electronic device, including: a processor 310 and a memory 320, where instructions are stored in the memory 320, and the instructions are loaded and executed by the processor 310 to implement the above-mentioned bridge construction monitoring method based on bridge deflection.

[0064] It should be noted that the above sequence of the embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some implementation manners, multitasking and parallel processing are also possible or may be advantageous.

[0065] Each embodiment in this specification is described in a progressive manner, and the same or similar parts among the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

Claims

1. A bridge construction monitoring method based on bridge deflection, characterized in that, The method includes the following steps: Obtaining the final height of each bridge tower after settlement and the geometric information of each sling before settlement of each bridge tower; Determining the indirect settlement amount of each sling caused by the settlement of the bridge tower and the deflection increment factor of the position of each sling corresponding to the bridge deck according to the final height and the geometric information; Determining the tension increment of each sling after the settlement of the bridge tower according to the deflection increment factor of the position of each sling corresponding to the bridge deck; Determining the target shortening length of each sling according to the indirect settlement amount of each sling caused by the settlement of the bridge tower and the tension increment of each sling after the settlement of the bridge tower; the target shortening length is used to shorten the length of the corresponding sling during the bridge construction process.

2. The bridge construction monitoring method based on bridge deflection according to claim 1, characterized in that: The geometric information includes the position and the first height; the determining the indirect settlement amount of each sling caused by the settlement of the bridge tower according to the final height and the geometric information includes: Determining the target catenary equation corresponding to the settlement of at least one bridge tower according to the standard catenary equation and the final height; Determining the second height of each sling corresponding to the settlement of the bridge tower according to the target catenary equation and the position, and respectively determining the indirect settlement amount of each sling caused by the settlement of the bridge tower according to the difference between the first height and the second height.

3. The bridge construction monitoring method based on bridge deflection according to claim 1, characterized in that: The geometric information includes the horizontal distance between each sling and each bridge tower; The determining the deflection increment factor of the position of each sling corresponding to the bridge deck according to the final height and the geometric information includes: Determining the first bridge tower with the largest settlement degree and the second bridge tower other than the first bridge tower from the bridge towers; Determining the first ratio of the final height of the first bridge tower to the final height of the second bridge tower, and the absolute value of the difference between the first ratio and the preset value; Determining the target horizontal distance between each sling and the first bridge tower according to the horizontal distance between each sling and each bridge tower, and respectively determining the deflection increment factor of the position of each sling corresponding to the bridge deck according to the first product of the target horizontal distance and the absolute value.

4. The bridge construction monitoring method based on bridge deflection according to any one of claims 1-3, characterized in that: The determining the tension increment of each sling after the settlement of the bridge tower according to the deflection increment factor of the position of each sling corresponding to the bridge deck includes: Obtaining the initial tension value of each sling before the settlement of the bridge tower and the initial deflection of the position corresponding to each sling; Respectively determining the sum value of the deflection increment factor of the position of each sling corresponding to the bridge deck and the preset value, and respectively determining the second product of the sum value and each initial deflection; Respectively determining the second ratio of the second product to the initial deflection of the position corresponding to each sling, and respectively obtaining the final tension value of each sling after the settlement of the bridge tower according to the third product of the second ratio and the initial tension value; Respectively determining the tension increment of each sling after the settlement of the bridge tower according to the difference between the final tension value and the initial tension value.

5. The bridge construction monitoring method based on bridge deflection according to claim 4, characterized in that: The geometric information includes the initial length; the determining the target shortening length of each sling according to the indirect settlement amount of each sling caused by the settlement of the bridge tower and the tension increment of each sling after the settlement of the bridge tower includes: Determine the length reduction of each sling after the bridge tower settlement according to the initial length, the initial tension value, and the tension increment of each sling after the bridge tower settlement. Determine the target shortening length of each sling according to the indirect settlement amount of each sling caused by the bridge tower settlement and the length reduction of each sling.

6. The bridge construction monitoring method based on bridge deflection according to claim 5, wherein: The step of determining the length reduction of each sling after the bridge tower settlement according to the initial length, the initial tension value, and the tension increment of each sling after the bridge tower settlement includes: Respectively determine the third ratio of the tension increment of each sling after the bridge tower settlement to the initial tension value. Respectively determine the length reduction of each sling after the bridge tower settlement according to the fourth product of the third ratio and the initial length.

7. The bridge construction monitoring method based on bridge deflection according to claim 5, characterized in that: The step of determining the target shortening length of each sling according to the indirect settlement amount of each sling caused by the bridge tower settlement and the length reduction of each sling includes: Respectively compare the indirect settlement amount of each sling caused by the bridge tower settlement with the length reduction of each sling. When the indirect settlement amount is equal to the length reduction amount, take the length reduction amount as the target shortening length of the sling. When the indirect settlement amount is greater than the length reduction amount, take the indirect settlement amount as the target shortening length of the sling. When the indirect settlement amount is less than the length reduction amount, analyze the maximum allowable elongation of the sling to determine the target shortening length of the sling.

8. The bridge construction monitoring method based on bridge deflection according to claim 7, characterized in that: The step of analyzing the maximum allowable elongation of the sling to determine the target shortening length of the sling when the indirect settlement amount is less than the length reduction amount includes: When the indirect settlement amount is less than the length reduction amount, obtain the cross-sectional area of the sling and the elastic modulus of the material. Determine the fifth product of the initial length and the initial tension value of the sling and the sixth product of the cross-sectional area and the elastic modulus of the material, and determine the maximum allowable elongation of the sling according to the fourth ratio of the fifth product to the sixth product. When the maximum allowable elongation of the sling is greater than the corresponding length reduction amount, take the indirect settlement amount of the sling as the target shortening length of the sling; when the maximum allowable elongation of the sling is less than or equal to the corresponding length reduction amount, take the difference between the corresponding length reduction amount and the maximum allowable elongation of the sling as the target shortening length of the sling.

9. A bridge construction monitoring system based on bridge deflection, characterized in that, Includes: An acquisition module for acquiring the final height of each bridge tower after settlement and the geometric information of each sling before each bridge tower settlement. A first determination module for determining the indirect settlement amount of each sling caused by the bridge tower settlement and the deflection increment factor of the corresponding bridge deck position of each sling according to the final height and the geometric information. A second determination module for determining the tension increment of each sling after the bridge tower settlement according to the deflection increment factor of the corresponding bridge deck position of each sling. A third determination module for determining the target shortening length of each sling according to the indirect settlement amount of each sling caused by the bridge tower settlement and the tension increment of each sling after the bridge tower settlement; the target shortening length is used to shorten the length of the corresponding sling during the bridge construction process.

10. An electronic device, characterized in that, Includes: A processor and a memory, wherein instructions are stored in the memory and loaded and executed by the processor to implement the method according to any one of claims 1-8.

Images