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

Abstract

The present invention relates to the technical field of electronic digital data processing, and in particular to a bridge construction monitoring method, system and equipment based on bridge deflection. The method obtains the final height of each bridge tower after settlement and the geometric information of each cable before settlement of each bridge tower, and determines the indirect settlement of each cable due to the settlement of the bridge tower and the deflection increment factor of each cable at the corresponding bridge deck position according to the final height and the geometric information. The tension increment of each cable after the settlement of the bridge tower is determined according to the deflection increment factor of each cable at the corresponding bridge deck position. The method determines the target shortening length of each cable according to the indirect settlement of each cable due to the settlement of the bridge tower and the tension increment of each cable after the settlement of the bridge tower, thereby shortening the length of the corresponding cable during the bridge construction process, compensating for the bridge tension imbalance caused by the settlement of the bridge tower, ensuring the stability of the bridge during long-term use, and realizing effective monitoring of the bridge construction.

Description

Technical Field

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

[0002] Deflection is an important indicator that reflects the stress and deformation of a bridge. It is closely related to the bridge's bearing capacity, performance, and structural stability. Especially during the construction process, changes in the bridge's deflection can directly reflect whether the bridge is evenly stressed, whether there is abnormal settlement or structural deformation, and thus provide a strong basis for the bridge's construction safety. Therefore, construction monitoring based on bridge deflection can promptly detect potential problems in the construction process, ensure the bridge's construction quality, and provide a basis for safety assessments in long-term operations.

[0003] Currently, during the design and construction of suspension bridges, a combination of towers and cables is typically used to transfer loads between different bridge locations and reduce deflection. However, the tower construction site may experience vertical settlement due to factors such as groundwater level fluctuations or geological conditions. This can reduce the tension in the cables, cause deflections, and lead to unbalanced bridge loads. Simply reinforcing the tower pile foundations cannot address long-term geological and 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 technical solutions adopted are as follows:

[0005] In a first aspect, an embodiment of the present application provides a bridge construction monitoring method based on bridge deflection, comprising:

[0006] Obtain the final height of each bridge tower after settlement and the geometric information of each cable before settlement;

[0007] Determining, based on the final height and the geometric information, an indirect settlement amount of each of the suspenders due to the settlement of the bridge tower and a deflection increment factor of each of the suspenders corresponding to a bridge deck position;

[0008] Determining the tension increment of each of the suspenders after the tower settles based on the deflection increment factor of each of the suspenders at the corresponding bridge deck position;

[0009] The target shortening length of each sling is determined based on the indirect sinking amount of each sling due to 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 bridge construction.

[0010] In one embodiment, the geometric information includes a position and a first height; and determining, based on the final height and the geometric information, an indirect settlement amount of each of the suspension cables due to the settlement of the bridge tower includes:

[0011] determining a target catenary chain equation corresponding to settlement of at least one pylon based on a standard catenary chain equation and the final height;

[0012] According to the target catenary chain equation and the position, a second height of each of the suspenders corresponding to the tower settlement is determined, and an indirect settlement of each of the suspenders due to the tower settlement is determined based on a difference between the first height and the second height.

[0013] In one embodiment, the geometric information includes a horizontal distance between each of the suspenders and each of the bridge towers; and determining, based on the final height and the geometric information, a deflection increment factor corresponding to a bridge deck position of each of the suspenders includes:

[0014] Determining a first bridge tower having the largest settlement degree and a second bridge tower other than the first bridge tower from among the bridge towers;

[0015] determining a first ratio of a final height of the first bridge tower to a final height of the second bridge tower, and an absolute value of a difference between the first ratio and a preset value;

[0016] According to the horizontal distance between each of the cables and each of the bridge towers, a target horizontal distance between each of the cables and the first bridge tower is determined, and according to the first product of the target horizontal distance and the absolute value, a deflection increment factor of each of the cables corresponding to the bridge deck position is determined.

[0017] In one embodiment, determining the tension increment of each suspender cable after the tower settles based on the deflection increment factor of each suspender cable corresponding to the bridge deck position includes:

[0018] Obtain the initial tension value of each sling before the bridge tower settles and the initial deflection of each sling at the corresponding position;

[0019] Determining the sum of the deflection increment factor and a preset value at the bridge deck position corresponding to each of the suspenders, and determining the second product of the sum and each of the initial deflections;

[0020] Determining a second ratio of the second product to the initial deflection at a corresponding position of each suspender cable, and obtaining a final tension value of each suspender cable after the tower settles based on a third product of the second ratio and the initial tension value;

[0021] The tension increment of each of the suspension cables after the tower settles is determined according to the difference between the final tension value and the initial tension value.

[0022] In one embodiment, the geometric information includes an initial length; and determining the target shortening length of each sling according to the indirect settlement of each sling due to the settlement of the bridge tower and the tension increment of each sling after the settlement of the bridge tower includes:

[0023] determining a length reduction of each of the slings after the tower settles based on the initial length, the initial tension value, and the tension increment of each of the slings after the tower settles;

[0024] The target shortening length of each of the suspension cables is determined according to the indirect sinking amount of each of the suspension cables due to the settlement of the bridge tower and the length reduction amount of each of the suspension cables.

[0025] In one embodiment, determining the length reduction of each sling after the tower settles based on the initial length, the initial tension value, and the tension increment of each sling after the tower settles includes:

[0026] respectively determining a third ratio of the tension increment of each of the suspension cables to the initial tension value after the tower settles;

[0027] The length reduction of each of the suspension cables after the tower settles is determined based on a fourth product of the third ratio and the initial length.

[0028] In one embodiment, determining the target shortening length of each sling according to the indirect sinking amount of each sling due to the settlement of the bridge tower and the length reduction amount of each sling includes:

[0029] respectively comparing the indirect subsidence of each of the suspension cables due to the settlement of the bridge tower with the length reduction of each of the suspension cables;

[0030] When the indirect sinking amount is equal to the length reduction amount, the length reduction amount is taken as the target shortening length of the sling;

[0031] When the indirect sinking amount is greater than the length reduction amount, the indirect sinking amount is used as the target shortening length of the sling;

[0032] When the indirect sinking amount is less than the length reduction amount, the maximum allowable elongation of the sling is analyzed to determine the target shortening length of the sling.

[0033] In one embodiment, when the indirect sinking 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:

[0034] When the indirect sinking amount is less than the length reduction amount, the cross-sectional area of ​​the sling and the elastic modulus of the material are obtained;

[0035] determining a fifth product of an initial length of the sling and an initial tension value, and a sixth product of a cross-sectional area of ​​the sling and an elastic modulus of a material, and determining a maximum allowable elongation of the sling based on a fourth ratio of the fifth product to the sixth product;

[0036] When the maximum allowable elongation of the sling is greater than the corresponding length reduction, the indirect sinking amount 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.

[0037] In a second aspect, an embodiment of the present application provides a bridge construction monitoring system based on bridge deflection, comprising:

[0038] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a processor and a memory, wherein the memory stores instructions, and the instructions are loaded and executed by the processor to implement the method in any one of the above-mentioned embodiments.

[0039] The present invention has the following beneficial effects:

[0040] By obtaining the final height of each bridge tower after settlement and the geometric information of each cable before settlement, the indirect settlement of each cable due to tower settlement and the deflection increment factor of each cable at the corresponding bridge deck position are determined based on the final height and geometric information. The tension increment of each cable after tower settlement is determined based on the deflection increment factor at the corresponding bridge deck position. The target shortening length of each cable is determined based on the indirect settlement of each cable due to tower settlement and the tension increment of each cable after tower settlement. The target shortening length is determined based on the analysis of the deflection increment factor and the tension increment, thereby shortening the length of the corresponding cable during bridge construction, compensating for the imbalance of bridge tension caused by tower settlement, ensuring the stability of the bridge during long-term use, and realizing effective monitoring of bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 A schematic flow chart of the steps of a bridge construction monitoring method based on bridge deflection provided by one embodiment of the present invention;

[0043] Figure 2A schematic diagram of a bridge provided by one embodiment of the present invention;

[0044] Figure 3 A schematic diagram of a standard catenary model provided by one embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the maximum allowable elongation of a sling provided by one embodiment of the present invention;

[0046] Figure 5 A block diagram of a bridge construction monitoring system based on bridge deflection provided by one embodiment of the present invention;

[0047] Figure 6 This is a structural block diagram of an electronic device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0048] To further illustrate the technical means and effectiveness of the present invention in achieving its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features, and effectiveness of the bridge construction monitoring method, system, and equipment based on bridge deflection proposed by the present invention. In the following description, different references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0049] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0050] It should be noted that the term “exemplary” in the embodiments of the present application refers to examples listed for the convenience of explanation, and other embodiments are not limited to the examples listed.

[0051] The specific scheme of the bridge construction monitoring method, system and equipment based on bridge deflection provided by the present invention is described in detail below with reference to the accompanying drawings.

[0052] See also Figure 1 , which shows a flow chart 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 include at least steps S100-S400:

[0053] S100: Acquire the final height of each bridge tower after settlement and the geometric information of each suspension cable before settlement of each bridge tower.

[0054] S200: Determine the indirect settlement of each suspender cable due to the tower settlement and the deflection increment factor of each suspender cable at the corresponding bridge deck position based on the final height and geometric information.

[0055] S300: Determine the tension increment of each suspender cable after the tower settles based on the deflection increment factor of each suspender cable at the corresponding bridge deck position.

[0056] S400. Determine a target shortening length of each sling based on the indirect sinking amount of each sling due to the tower settlement and the tension increment of each sling after the tower settlement. The target shortening length is used to shorten the length of the corresponding sling during bridge construction.

[0057] The technical solution of the embodiment of the present application obtains the final height of each bridge tower after settlement and the geometric information of each cable before settlement of each bridge tower, and determines the indirect settlement of each cable due to the settlement of the bridge tower and the deflection increment factor of each cable at the corresponding bridge deck position based on the final height and geometric information, and determines the tension increment of each cable after the settlement of the bridge tower based on the deflection increment factor at the corresponding bridge deck position of each cable, and determines the target shortening length of each cable based on the indirect settlement of each cable due to the settlement of the bridge tower and the tension increment of each cable after the settlement of the bridge tower. The target shortening length is determined based on the analysis of the deflection increment factor and the tension increment, thereby shortening the length of the corresponding cable during the bridge construction process, compensating for the imbalance of bridge tension caused by the settlement of the bridge tower, ensuring the stability of the bridge during long-term use, and realizing effective monitoring of bridge construction.

[0058] like Figure 2 As 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, a first bridge tower 11 and a second bridge tower 12 are used as an example for explanation, and the number of bridge towers in other embodiments is not specifically limited), suspenders 2, main cables 3, a bridge deck 4, etc. A suspension bridge is a bridge in which cables (or steel chains) are suspended and anchored on both sides (or both ends of the bridge) through bridge towers as the main load-bearing components of the superstructure. Specifically, the main cable 3 extends from the support points at both ends (usually bridge towers or supports) 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 suspenders 2. The support of the bridge tower causes the main cable 3 to sag from the support points at both ends and be transmitted to the bridge deck 4 through the suspenders 2. Since the main cable 3 is in the shape of a parabola or a near-parabola, the tension of the main cable 3 is greater in the center area, while the tension in the area close to the bridge tower is smaller. Generally, during the design and construction of a suspension bridge, the construction sequence is as follows: Foundation construction Main cable and sling construction During the installation of traffic facilities, after the construction of the bridge tower is completed, the foundation soil will gradually compact due to the load, which may cause settlement of the bridge tower foundation and other components. The foundation settlement will cause the bridge tower to settle, affecting the height of the bridge tower and the subsequent connection between the suspension cable and the bridge deck, thereby affecting the force distribution and overall stability of the bridge.

[0059] Therefore, in the embodiment of the present application, relevant data (such as the initial height of the bridge tower before settlement, the geometric information of each suspension cable before settlement of each bridge tower) and the settlement-related data of the bridge tower measured after construction is completed (such as the final height of the bridge tower after settlement) can be obtained based on the BIM design model of the bridge established before construction. Optionally, the geometric information of each suspension cable before settlement of each bridge tower includes but is not limited to the position, first height, horizontal distance between each suspension cable and each bridge tower, and initial length. It should be noted that Figure 2 Where 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.

[0060] It should be noted that since tower settlement affects the connection length and tension between the cables and the bridge deck, and thus the force distribution of the bridge, the indirect settlement of the bridge at different cable positions is first calculated. Then, by analyzing the tower settlement and the relationship between the tension at different cable positions and the bridge deflection, the cable tension increment is determined. The cable lengths at different locations are then adjusted based on the tension increment and indirect settlement. If the bridge deck height corresponding to tower settlement shifts, the cable length needs to be appropriately reduced to maintain the bridge deck position.

[0061] In one embodiment, step S200 determines the indirect settlement of each suspension cable due to tower settlement based on the final height and geometric information, including steps S201-S202:

[0062] S201. Determine a target suspension chain equation corresponding to settlement of at least one bridge tower based on a standard suspension chain equation and a final height.

[0063] In the embodiment of the present application, taking the first pylon 11 and the second pylon 12 as an example, it is possible that both pylons have sunk and the sunk heights may be different. However, the main cable 3 is a catenary. Therefore, it cannot be assumed that the sinking height of the pylon is equal to the descending height of the sling. Here, an unequal height catenary model is introduced for analysis. Figure 3 The figure shows a standard catenary model, where the horizontal axis represents the position of the sling. (equivalent to the horizontal coordinate), with the vertical axis representing the corresponding cable height. Assuming that the two pylons, first pylon 11 and second pylon 12, experience different degrees of settlement, the height change of each pylon will affect the shape of the entire catenary, and thus the drop height of each cable. Therefore, a target catenary chain equation is constructed based on the standard catenary chain equation. For example, the target catenary chain equation is a unequal-height catenary model (the same applies if first pylon 11 and second pylon 12 experience the same degree of settlement).

[0064] Specifically, assuming that the first pylon 11 and the second pylon 12 at both ends have not sunk and are supporting the suspenders at the same height, the corresponding standard catenary equation is: ,in is in position The height of the sling, is the tension at both ends of the catenary (main cable), is the weight 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 heights of the two bridge towers before settlement are , and the two bridge towers were lowered to different heights and , the final height of the first bridge tower 11 is = , the final height of the second bridge tower 12 is = When the two pylons settle, the vertical height of the entire catenary will be affected by the combined effect of the two pylon settlements and needs to be processed in sections:

[0065] The order from the first bridge tower 11 to the second bridge tower 12 is: ;

[0066] The order from the second pylon 12 to the first pylon 11 is: , is the horizontal distance between the first bridge tower 11 and the second bridge tower 12. and Represent the scale factors of the first bridge tower 11 and the second bridge tower 12 respectively, and the scale factors and The scale factor will be adjusted according to the settlement of the first bridge tower 11 and related physical parameters. Generally, a bridge tower with a larger settlement will increase the scale factor.

[0067] Assuming that the shape near the bridge towers does not change dramatically, the entire system can be approximated as a single catenary. Then, the effect of the height difference between the two bridge towers on the shape of the cable can be superimposed. The corresponding target catenary chain equation after the settlement of at least one bridge tower can be expressed as:

[0068]

[0069] in, is in position The height of the sling is and represents the local scale factor of the above piecewise catenary equation, so the is the scale factor (global) in the standard catenary equation.

[0070] S202. Determine the second height of each suspension cable due to the tower settlement based on the target suspension chain equation and position, and determine the indirect settlement of each suspension cable due to the tower settlement based on the difference between the first height and the second height.

[0071] Optionally, after determining the target catenary chain equation, the position of each sling is substituted into the target catenary chain equation. , so that the , that is, the second height of each cable corresponding to the tower settlement, recorded as , that is, The second height of the sling. Then, according to the first height (i.e. the first time before the tower settles The difference between the height of the first sling and the second height , determine the indirect settlement of each cable due to tower settlement :

[0072]

[0073] Where, For the The indirect settlement of each cable due to the tower settlement, It represents the influence of the settlement of the first pylon 11 and the second pylon 12 on the height of different suspension cables. Then, the suspension cable lengths can be adjusted based on this height influence to ensure the stability of the bridge deck.

[0074] It should be noted that, in general, during the bridge modeling process, the lengths of different cables and their tension on the bridge deck are accurately simulated and verified. If the bridge tower settles, on the one hand, the cables will sink and affect the design position of the bridge deck. At the same time, the geometric changes caused by the tower settlement will change the force distribution of the cables and the tension of the bridge deck on the cables, making the original simulation results no longer applicable. Therefore, it is necessary to analyze the force changes of different cables and adaptively adjust the cable lengths. In the embodiment of the present application, the vertical force on the bridge deck is analyzed. The bridge deck is generally subject to the tension from the cables and the gravity of its own load. The impact of the load gravity on the bridge deck is mainly in the deflection, that is, the tension of the cables is reflected in the deflection of the bridge deck. If the two bridge towers settle to different degrees and there is a height difference, the tension of the cables at different positions and the deflection of the bridge deck will change accordingly. In order to maintain the stability of the bridge deck, it is necessary to adjust the length of the cables to maintain the original tension. For example, if the first pylon settles more (also called the degree) than the second pylon, the first pylon will be lower than the second pylon, and the cables of the first pylon will be looser on the bridge deck than those of the second pylon. This will cause the deflection of the bridge deck at the first pylon to increase significantly, and the degree of deflection increase will gradually decrease towards the second pylon. At the same time, the greater the final height difference between the first pylon and the second pylon, the greater the change in deflection, and vice versa.

[0075] In one embodiment, step S200 determines the deflection increment factor of each suspender corresponding to the bridge deck position based on the final height and geometric information, including steps S203-S205:

[0076] S203: Determine, from among the bridge towers, a first bridge tower having the largest settlement degree and a second bridge tower other than the first bridge tower.

[0077] For example, in the embodiment 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 towers. Figure 2 shown.

[0078] S204: Determine a first ratio of the final height of the first bridge tower to the final height of the second bridge tower, and an absolute value of a difference between the first ratio and a preset value.

[0079] Optionally, determine the final height of the first pylon The final height of the second pylon The first ratio , and the first ratio The absolute value of the difference from the preset value (exemplarily 1) .

[0080] S205. Determine a target horizontal distance between each suspender and the first pylon based on the horizontal distance between each suspender and each pylon, and determine a deflection increment factor for each suspender at a corresponding bridge deck position based on a first product of the target horizontal distance and the absolute value.

[0081] In the embodiment of the present application, the target horizontal distance between each sling and the first pylon is determined according to the horizontal distance between each sling and each pylon. , that is, The target horizontal distance between each suspender and the first pylon is calculated, and the deflection increment factor of each suspender corresponding to the bridge deck position is determined based on the first product of the target horizontal distance and the absolute value:

[0082]

[0083] Where, For the The deflection increment factor of each cable corresponding to the bridge deck position. For position ( The position of each sling corresponds to the bridge deck). is the location of the first bridge tower; The smaller the distance, the closer to the first bridge tower, the looser the cable will be, and the larger the increment of bridge deck deflection at the corresponding position, and vice versa. is the height difference between the first and second pylons, representing the degree of bridge deck inclination. The lower the side, the greater the influence of load gravity on the bridge deck, and the corresponding deflection change is greater. The result is normalized to the range of [0,1].

[0084] It should be noted that at a certain position on the bridge deck, if the deflection increment factor is larger, the degree of deflection increase at this position is greater, and vice versa. For the bridge deck, since the cable tension it is subjected to is upward, 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. In order to balance this trend, it is necessary to increase the upward cable tension, and the increment of deflection is equal to the increment of cable tension.

[0085] In one embodiment, step S300 includes steps S301-S304:

[0086] S301: Obtain the initial tension value of each sling before the bridge tower settles and the initial deflection of each sling at a corresponding position.

[0087] Optionally, obtain the initial tension value of each cable before the tower settles And the initial deflection of each sling at the corresponding position , That is, the first time before the bridge tower settles The initial tension value of the sling, That is, the first time before the bridge tower settles The initial deflection of the corresponding position of each sling; wherein, obtaining the initial tension value and the initial deflection can be based on the existing method and will not be repeated.

[0088] S302: Determine the sum of the deflection increment factor and the preset value for each suspender at the bridge deck position corresponding to each suspender, and determine the second product of the sum and each initial deflection.

[0089] Optionally, determine the deflection increment factor for each cable at the corresponding bridge deck position The sum of the value and the preset value (for example, 1) , and determine the values ​​of and respectively With each initial deflection The second product of .

[0090] S303: Determine a second ratio of the second product to the initial deflection at the corresponding position of each cable, and obtain a final tension value of each cable after the tower settles based on a third product of the second ratio and the initial tension value.

[0091] Optionally, the second product is determined separately Initial deflection corresponding to each sling The second ratio , Represents the The increase in the deflection of the bridge deck corresponding to each suspender is calculated based on the second ratio. With initial tension value The third product of gives the final tension value of each cable after the tower settles:

[0092]

[0093] in, After the tower settled, the suspension cable The final tension value of the sling.

[0094] S304: Determine the tension increment of each suspension cable after the tower settles based on the difference between the final tension value and the initial tension value.

[0095] Optionally, depending on the final tension value With initial tension value The difference between the two values ​​is used to determine the tension increment of each cable after the tower settles. , That is, the first The increase in tension in the sling.

[0096] In one embodiment, step S400 includes steps S401-S402:

[0097] S401. Determine a length reduction of each sling after the tower settles based on the initial length, the initial tension value, and the tension increment of each sling after the tower settles.

[0098] It should be noted that if the bridge tower experiences the above-mentioned settlement, the tension of the different cables will change. Therefore, in order to maintain the balance between the bridge deck tension and the load gravity, the cable tension needs to be adjusted. The cable tension adjustment is generally reflected in the change in its length. To increase the tension of the corresponding cable, the length of the cable needs to be shortened, making the cable tighter, thereby increasing the cable tension. The greater the increase in cable tension, the greater the corresponding shortening of the cable. Therefore, for any cable, its length reduction can be determined based on the following steps:

[0099] Determine the tension increment of each cable after the tower settles With initial tension value The third ratio , respectively, according to the third ratio With initial length (No. The fourth product of the initial length of each cable is used to determine the length reduction of each cable after the tower settles:

[0100]

[0101] in, The first time after the tower settled The length of the sling is reduced.

[0102] S402: Determine a target shortening length of each sling according to the indirect sinking amount of each sling due to the settlement of the bridge tower and the length reduction amount of each sling.

[0103] First, the indirect settlement of each cable due to the tower settlement is calculated. The length reduction of each sling Make a comparison.

[0104] Secondly, when the indirect sinking Equal to the length reduction , indicating that the increase in tension caused by the indirect sinking of the cable due to the settlement of the bridge tower just compensates for the tension loss caused by the change in the bridge deck force. The target shortening length of the sling is the length reduction amount. The length of the corresponding sling is reduced.

[0105] Then, when the indirect sinking Greater than the length reduction , indicating that the increase in tension caused by the indirect settlement of the slings due to the settlement of the bridge tower exceeds the tension loss caused by the change in the bridge deck force. Since the material of the bridge deck slings will age after long-term use, the tension will gradually decrease. Therefore, high tension is not harmful to the long-term use of the bridge deck. Therefore, the indirect settlement is used as the The target shortening length of the sling, i.e. the indirect sinking amount Adjustment is possible as the length of the sling is reduced.

[0106] Finally, when the indirect sinking Less than the length reduction , which means that the increase in tension caused by the indirect sinking of the suspender due to the settlement of the bridge tower has not reached the tension loss caused by the change in the bridge deck force. Then, adjusting the suspender length based on any length reduction will cause the bridge deck structure to be unreliable. Based on the above situation, it is necessary to find an optimal point where the bridge deck position is accurate and the force is balanced. For example, it is hoped to determine an optimal reduction length to maintain the horizontal position of the bridge deck while maintaining the force balance as much as possible. Since the suspender is generally made of flexible material and can be stretched appropriately, it is necessary to determine the maximum allowable elongation of the suspender while maintaining the tension unchanged. Specifically, it includes steps 1 to 3:

[0107] Step 1: Current indirect sinking Less than the length reduction , get the cross-sectional area of ​​the sling (i.e. cross-sectional area of ​​the sling) and the elastic modulus of the material ; The acquisition method is an existing method and will not be repeated here.

[0108] like Figure 4 As shown, step 2, determine the initial length of the sling (i.e. The initial length of the sling) and the initial tension value (i.e. Initial tension value of the sling ) and the cross-sectional area of ​​the sling The elastic modulus of the material The sixth product of , and according to the fourth ratio of the fifth product to the sixth product, determine the maximum allowable elongation of the sling:

[0109]

[0110] Where, For the The maximum allowable elongation of a sling while maintaining constant tension.

[0111] Step 3: When the maximum allowable elongation of the sling is greater than the corresponding length reduction, the indirect sinking amount 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.

[0112] It should be noted that if the maximum allowable elongation of the sling The larger it is, the longer it can be stretched while maintaining the corresponding tension, that is, the more the stretched length will be offset and Therefore, when the maximum allowable elongation of the sling is Less than or equal to the corresponding length reduction (No. The length reduction of each sling) The maximum allowable elongation of the sling The difference between the two values ​​is taken as the target shortening length of the sling, i.e. The target shortening length of the sling is However, due to the possible maximum allowable elongation of the sling Greater than the corresponding length reduction The situation shows that the elasticity of this sling is excellent, so directly use the corresponding (No. The indirect sinking amount of each sling is used as the target shortening length of the sling.

[0113] In the embodiment of the present application, the tension increment of the cable is determined by calculating the indirect sinking amount of different cable positions of the bridge after the bridge tower is lowered, and the relationship between the tension at different cable positions and the deflection of the bridge, thereby determining the target shortening length of each cable. Therefore, when constructing the main cable and the cable after the construction of the bridge tower is completed, the corresponding cable length can be reduced and optimized based on the target shortening length of the cable, thereby compensating for the imbalance of bridge tension caused by the settlement of the bridge tower, ensuring the stability of the bridge during long-term use, and realizing effective bridge construction monitoring.

[0114] Reference Figure 5 , shows a structural block diagram of a bridge construction monitoring system based on bridge deflection according to an embodiment of the present application. The system may include:

[0115] An acquisition module is used to obtain the final height of each bridge tower after settlement and the geometric information of each suspension cable before settlement of each bridge tower;

[0116] A first determination module is configured to determine, based on the final height and geometric information, the indirect settlement of each suspender cable caused by the tower settlement and the deflection increment factor of each suspender cable at a corresponding bridge deck position;

[0117] The second determining module is used to determine the tension increment of each sling after the tower settles based on the deflection increment factor of each sling corresponding to the bridge deck position;

[0118] The third determination module is used to determine the target shortening length of each sling based on the indirect settlement of each sling due to the settlement of the bridge tower and the tension increase of each sling after the bridge tower settlement; the target shortening length is used to shorten the length of the corresponding sling during bridge construction.

[0119] In the embodiment of the present application, the functions of each module in the system can be referred to the corresponding description in the above method and will not be repeated here.

[0120] Reference Figure 6 In one embodiment, the embodiment of the present application also provides an electronic device, including: a processor 310 and a memory 320, wherein the memory 320 stores instructions, and the instructions are loaded and executed by the processor 310 to implement the above-mentioned bridge construction monitoring method based on bridge deflection.

[0121] It should be noted that the order in which the embodiments of the present invention are described above is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0122] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various 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 comprises: Obtain the final height of each bridge tower after settlement and the geometric information of each cable before settlement; Determining, based on the final height and the geometric information, an indirect settlement amount of each of the suspenders due to the settlement of the bridge tower and a deflection increment factor of each of the suspenders corresponding to a bridge deck position; Determining the tension increment of each of the suspenders after the tower settles based on the deflection increment factor of each of the suspenders at the corresponding bridge deck position; determining a target shortening length of each sling according to the indirect sinking 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; The method for determining the target shortening length includes: Determine the length reduction of each cable after the tower settles based on the initial length, initial tension value and the tension increment of each cable after the tower settles; determine the third ratio of the tension increment to the initial tension value of each cable after the tower settles; determine the length reduction of each cable after the tower settles based on the fourth product of the third ratio and the initial length; determine the target shortening length of each cable based on the indirect sinking of each cable caused by the tower settles and the length reduction of each cable; compare the indirect sinking of each cable caused by the tower settles with the length reduction of each cable; when the indirect sinking is equal to the length reduction, use the length reduction as the target shortening length of the cable; when the indirect sinking is greater than the length reduction, use the indirect sinking as the target shortening length of the cable. the target shortening length of the sling; when the indirect sinking 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; when the indirect sinking amount is less than the length reduction amount, obtaining the cross-sectional area of ​​the sling and the elastic modulus of the material; determining the fifth product of the initial length and the initial tension value of the sling and the sixth product of the cross-sectional area of ​​the sling and the elastic modulus of the material, and determining the maximum allowable elongation of the sling based on a 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, taking the indirect sinking 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, taking the difference between the corresponding length reduction amount and the maximum allowable elongation of the sling as the target shortening length of the sling.

2. The bridge construction monitoring method based on bridge deflection according to claim 1 is characterized by: The geometric information includes a position and a first height; and determining, based on the final height and the geometric information, an indirect settlement amount of each of the suspension cables due to the settlement of the bridge tower includes: determining a target catenary chain equation corresponding to settlement of at least one pylon based on a standard catenary chain equation and the final height; According to the target catenary chain equation and the position, a second height of each of the suspenders corresponding to the tower settlement is determined, and an indirect settlement of each of the suspenders due to the tower settlement is determined based on a difference between the first height and the second height.

3. The bridge construction monitoring method based on bridge deflection according to claim 1 is characterized by: The geometric information includes the horizontal distance between each of the suspension cables and each of the bridge towers; Determining the deflection increment factor of each of the suspenders corresponding to the bridge deck position according to the final height and the geometric information includes: Determining a first bridge tower having the largest settlement degree and a second bridge tower other than the first bridge tower from among the bridge towers; determining a first ratio of a final height of the first bridge tower to a final height of the second bridge tower, and an absolute value of a difference between the first ratio and a preset value; According to the horizontal distance between each of the cables and each of the bridge towers, a target horizontal distance between each of the cables and the first bridge tower is determined, and according to the first product of the target horizontal distance and the absolute value, a deflection increment factor of each of the cables corresponding to the bridge deck position is determined.

4. The bridge construction monitoring method based on bridge deflection according to any one of claims 1 to 3, characterized in that: Determining the tension increment of each suspender cable after the tower settles based on the deflection increment factor of each suspender cable corresponding to the bridge deck position includes: Obtain the initial tension value of each sling before the bridge tower settles and the initial deflection of each sling at the corresponding position; Determining the sum of the deflection increment factor and a preset value at the bridge deck position corresponding to each of the suspenders, and determining the second product of the sum and each of the initial deflections; Determining a second ratio of the second product to the initial deflection at a corresponding position of each suspender cable, and obtaining a final tension value of each suspender cable after the tower settles based on a third product of the second ratio and the initial tension value; The tension increment of each of the suspension cables after the tower settles is determined based on the difference between the final tension value and the initial tension value.

5. A bridge construction monitoring system based on bridge deflection, characterized in that: include: An acquisition module is used to obtain the final height of each bridge tower after settlement and the geometric information of each suspension cable before settlement of each bridge tower; A first determining module is configured to determine, based on the final height and the geometric information, an indirect settlement amount of each of the suspenders due to the settlement of the bridge tower and a deflection increment factor of each of the suspenders corresponding to a bridge deck position; A second determining module is configured to determine the tension increment of each of the suspenders after the tower settles based on the deflection increment factor of each of the suspenders corresponding to the bridge deck position; a third determining module, configured to determine a target shortening length of each sling according to an indirect sinking amount of each sling due to the settlement of the bridge tower and a 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 bridge construction; The method for determining the target shortening length includes: Determine the length reduction of each cable after the tower settles based on the initial length, initial tension value and the tension increment of each cable after the tower settles; determine the third ratio of the tension increment to the initial tension value of each cable after the tower settles; determine the length reduction of each cable after the tower settles based on the fourth product of the third ratio and the initial length; determine the target shortening length of each cable based on the indirect sinking of each cable caused by the tower settles and the length reduction of each cable; compare the indirect sinking of each cable caused by the tower settles with the length reduction of each cable; when the indirect sinking is equal to the length reduction, use the length reduction as the target shortening length of the cable; when the indirect sinking is greater than the length reduction, use the indirect sinking as the target shortening length of the cable. the target shortening length of the sling; when the indirect sinking 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; when the indirect sinking amount is less than the length reduction amount, obtaining the cross-sectional area of ​​the sling and the elastic modulus of the material; determining the fifth product of the initial length and the initial tension value of the sling and the sixth product of the cross-sectional area of ​​the sling and the elastic modulus of the material, and determining the maximum allowable elongation of the sling based on a 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, taking the indirect sinking 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, taking the difference between the corresponding length reduction amount and the maximum allowable elongation of the sling as the target shortening length of the sling.

6. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores instructions, and the instructions are loaded and executed by the processor to implement the method according to any one of claims 1 to 4.

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