Construction method of cantilever cast arch bridge based on multi-objective optimization

Abstract

The application discloses a kind of based on multi-objective optimization's cantilever arch bridge construction method, comprising the following steps: to the whole process structure of construction is simulated parameterization modeling, and to the parameterization finite element model established is analyzed, extracts relevant analysis results and exports file, imports the output file into multi-objective optimization program, completes the multi-objective optimization solution of the reasonable construction of cantilever concrete arch bridge cable force, obtains the cable force in construction;Wherein, the specific process of construction main arch ring is as follows: cantilever pouring current section arch box, and the arch box is connected with the cable and the cable tower using the cable, and according to the cable force obtained by multi-objective solution, the cable is tensioned, after tensioning, the longitudinal offset angle and transverse offset angle of cable are monitored in real time, when the longitudinal offset angle and transverse offset angle of cable exceed preset limit, alarm is sent.Compared with prior art, the application can realize multi-objective optimization.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a cantilevered arch bridge construction method based on multi-objective optimization. Background Art

[0002] The construction process of the arch ring segments of a cantilevered cast concrete arch bridge is essentially a process of continuously updating and establishing a new self-balanced structure based on the existing structural balance. As the number of cantilevered segments increases, the process of establishing a new balance becomes more complex and its stability deteriorates. The maximum cantilever state is the most dangerous and unstable, and large-scale cable adjustments are not suitable under this state. Furthermore, the pylons, cables, and anchors of cantilevered cast concrete arch bridges are all temporary structures, and their safety factors are generally lower than those of permanent structures such as pylons and cables in concrete cable-stayed bridges of the same span. Repeated tensioning and adjustment of cables and anchors can easily lead to failure of the working anchors. Furthermore, cable tensioning and adjustment during construction are generally performed at relatively high pylons, posing a high risk of working at height.

[0003] Determining the optimal cable tension for long-span cantilever cast-in-place reinforced concrete arch bridges is a complex systemic problem. While minimizing the number of cable tensioning and adjustments, it is crucial to ensure the mechanical and deformation safety of the pylon-cable-cantilever-arch coupling during construction, while also meeting the mechanical and linear requirements of the arch structure after completion. This presents a multi-objective optimization problem, for which existing solutions are lacking.

[0004] In view of this, a construction method of cantilevered arch bridge based on multi-objective optimization is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a cantilevered arch bridge construction method based on multi-objective optimization to solve the problems pointed out in the background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A method for constructing a cast-in-place arch bridge based on multi-objective optimization comprises the following steps:

[0008] The entire construction process structure is simulated and parametrically modeled. The established parametric finite element model is analyzed, and relevant analysis results are extracted and output to a file. The output file is imported into a multi-objective optimization program to complete the multi-objective optimization solution for the reasonable construction cable force of the cantilever concrete arch bridge and obtain the cable force during construction.

[0009] Construction of anchors and pylons on junction piers;

[0010] According to the cable force in construction obtained by multi-objective solving, the construction main arch ring is anchored by anchorages as a back anchorage system of the main arch ring, the anchorages are connected with the cable tower through anchor cables, and the other side of the cable tower is anchored with the main arch ring through cable.

[0011] The specific process of constructing the main arch ring is as follows:

[0012] The current segment arch box is cantilever cast, the arch box is connected with the cable tower through the cable, the cable is tensioned according to the cable force obtained by multi-objective solving, and after the tensioning is completed, the longitudinal and transverse offset angles of the cable are monitored in real time. When the longitudinal and transverse offset angles of the cable exceed the preset limit value, an alarm is sent. The longitudinal offset angle refers to the offset angle in the vertical plane, and the transverse offset angle refers to the offset angle in the horizontal plane.

[0013] The above steps are repeated until the main arch ring is completed. After the closure is completed, the cable, anchor cable and cable tower are removed.

[0014] In a preferred embodiment, the method further comprises the steps of: after the cable tensioning is completed, taking the transverse offset angle of the cable that has been tensioned as the statistical object, calculating the coincidence degree of the value range of the transverse offset angle of the cable that has been tensioned in the adjacent unit time, and if the coincidence degree in a certain adjacent unit time is lower than the preset value, and the coincidence degrees of the subsequent preset number of adjacent unit times meet the preset value, an alarm is sent.

[0015] In a preferred embodiment, the method further comprises the steps of: after the cable tensioning is completed, installing an offset angle monitoring device to realize real-time monitoring of the longitudinal and transverse offset angles of the cable. The offset angle monitoring device comprises a fixed base, a support frame, two rotation monitoring units, a double-shaft motor, a first friction wheel and a second friction wheel. The support frame is arranged on the fixed base, the double-shaft motor is arranged on the support frame, the first and second friction wheels are respectively connected to the two shafts of the double-shaft motor, the rotation monitoring unit comprises a rotating ring and a strain gauge, the rotating ring is arranged on the support frame, the strain gauge is arranged on the inner side wall of the rotating ring, the first and second friction wheels respectively contact one rotating ring to drive the corresponding rotating ring to rotate; after the cable tensioning is completed, the fixed base is installed on the arch box, the cable passes through two rotating rings, the strain gauge contacts the cable, and the double-shaft motor is used to drive the rotating ring to rotate reciprocally.

[0016] In a preferred embodiment, the support frame comprises a support column and a half-pipe type placement plate. The support column is arranged on the fixed base, and the half-pipe type placement plate is arranged on the support column. Two placement grooves are arranged on the half-pipe type placement plate, and the rotating ring is limited in the placement grooves.

[0017] In a preferred embodiment, the half-pipe type setting plate comprises a plate body, a first sealing plate and a second sealing plate, the first sealing plate and the second sealing plate are fixed at two ends of the plate body by bolts, and the setting groove is formed between the first sealing plate and the plate body and between the second sealing plate and the plate body, respectively.

[0018] In a preferred embodiment, the side of the setting groove is provided with a limiting rib, and the side of the rotating ring is provided with a limiting groove matched with the limiting rib.

[0019] In a preferred embodiment, the strain gauge is arranged in a U shape.

[0020] In a preferred embodiment, the method further comprises the steps of monitoring the cable force of the cable after the cable tensioning is completed, and adjusting the cable force according to the monitoring result, so that all the cable forces meet the multi-objective solution range requirements.

[0021] In a preferred embodiment, the method further comprises the step of installing a cable force monitoring device after the cable tensioning is completed to monitor the cable force, the cable force monitoring device comprising a support, a pressing assembly and two gripping assemblies, the middle part of the support being provided with a middle setting bin, the pressing assembly comprising an action device, a pressure gauge, a stroke measuring device and a pressing block, the action device being fixedly arranged on the support, the pressure gauge being arranged between the action device and the pressing block, the pressing block penetrating through the middle setting bin, the stroke measuring device being arranged on the side of the pressing block to measure the stroke of the pressing block, and the two gripping assemblies being arranged at two ends of the support, respectively.

[0022] In a preferred embodiment, the action device is arranged as a pneumatic cylinder or an electric push rod.

[0023] In a preferred embodiment, the stroke measuring device comprises a measuring wheel and a wheel speed meter, the wheel circumference of the measuring wheel abutting against the pressing block, and the wheel speed meter being used to measure the wheel speed of the measuring wheel.

[0024] In a preferred embodiment, the bottom of the pressing block is provided with a first V-shaped slot.

[0025] In a preferred embodiment, end housing bins are respectively provided at both ends of the bracket, and a first ring outlet, a supporting opening, and a second ring outlet are provided at the bottom of the end housing bin, wherein the supporting opening is provided between the first ring outlet and the second ring outlet. The gripping assembly comprises a gripping ring, a driving wheel, a first acting wheel, a second acting wheel, a motor, a supporting block, and a downward pressing drive device. The driving wheel, the first acting wheel, the second acting wheel, and the motor are provided in the end housing bin, and the motor is connected to the driving wheel for driving the driving wheel to rotate. The first acting wheel and the second acting wheel are respectively provided on both sides of the driving wheel and are driven to rotate by the driving wheel. A notch is provided in the gripping ring, and the notch has a first end and a second end. During operation, the gripping ring is supported by the first acting wheel and / or the second acting wheel and passes through the first ring outlet, wherein the first end is located in the end housing bin and the second end enters and exits the end housing bin via the second ring outlet. The downward pressing drive device is provided at the top of the end housing bin, and the supporting block is connected to the downward pressing drive device and inserted into the end housing bin, and is provided corresponding to the supporting opening.

[0026] In a preferred embodiment, the downward driving device is configured as a cylinder or an electric telescopic rod, and a second V-shaped groove is provided at the bottom of the abutting block.

[0027] In a preferred embodiment, the central angle of the notch and the corresponding gripping ring is 60-150 degrees.

[0028] In a preferred embodiment, the gripping assembly further includes a first linkage wheel and a second linkage wheel, wherein the circumference of the first linkage wheel fits the driving wheel and the first action wheel, and the circumference of the second linkage wheel fits the driving wheel and the second action wheel.

[0029] Compared with the existing technology, the present invention provides a cantilever arch bridge construction method based on multi-objective optimization, which obtains a parametric finite element model through simulation parametric modeling, obtains analysis results by analyzing the parametric finite element model, and imports the analysis results into a multi-objective optimization program to achieve multi-objective solution, thereby obtaining a cable force that meets the requirements of achieving multiple goals, thereby achieving multi-objective considerations during the construction process.

[0030] Meanwhile, in order to realize real-time monitoring in the construction process and realize multiple engineering detection target monitoring, the longitudinal offset angle and the transverse offset angle of the buckle cable are monitored in real time after the buckle cable tensioning is completed, and whether the working condition is normal is judged by judging whether the longitudinal offset angle and the transverse offset angle exceed the preset limit, specifically, when the longitudinal offset angle and the transverse offset angle of the buckle cable exceed the limit, it may indicate that the buckle cable or the buckle tower is abnormal, and timely inspection is needed, the longitudinal offset angle anomaly generally corresponds to the abnormal state of the buckle cable, and the transverse offset anomaly generally corresponds to the abnormal state of the buckle tower, for example, the buckle tower tilts or twists. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of a cast-in-place arch bridge to which the cast-in-place arch bridge construction method based on multi-objective optimization is applied.

[0032] Figure 2 is a structural schematic diagram of an offset angle detection device to which the cast-in-place arch bridge construction method based on multi-objective optimization is applied (first perspective).

[0033] Figure 3 is a structural schematic diagram of an offset angle detection device to which the cast-in-place arch bridge construction method based on multi-objective optimization is applied (second perspective).

[0034] Figure 4 is a structural schematic diagram of a cable force monitoring device used in the cast-in-place arch bridge construction method based on multi-objective optimization.

[0035] Figure 5 is a structural schematic diagram of the first perspective of an end placement bin of a cable force monitoring device used in the cast-in-place arch bridge construction method based on multi-objective optimization.

[0036] Figure 6 is a structural schematic diagram of the second perspective of an end placement bin of a cable force monitoring device used in the cast-in-place arch bridge construction method based on multi-objective optimization.

[0037] IN THE DRAWINGS

[0038] Anchor 1; buckle tower 2; main arch ring 3; anchor cable 4; buckle cable 5; support 6; intermediate storage bin 7; end storage bin 8; first ring outlet 9; second ring outlet 10; action device 11; stroke metering device 12; pressing block 13; first V-shaped slot 14; gripping ring 15; notch 16; driving wheel 17; first action wheel 18; second action wheel 19; motor 20; abutting block 21; second V-shaped slot 22; downward driving device 23; first linkage wheel 24; second linkage wheel 25; offset angle monitoring device 26; fixed base 27; support column 28; plate body 29; storage groove 30; first sealing plate 31; second sealing plate 32; double-shaft motor 33; first friction wheel 34; second friction wheel 35; rotating ring 36; strain gauge 37. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with the drawings.

[0040] The specific embodiment is only an explanation of the application, and is not a limitation of the application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the application.

[0041] As shown in the figure, a multi-objective optimization-based cantilevered arch bridge construction method comprises the following steps: Figures 1 to 6

[0042] S1, parameterized modeling of the structure in the whole construction process is performed, and the established parameterized finite element model is analyzed, relevant analysis results are extracted and output files are imported into a multi-objective optimization program, multi-objective optimization solving of reasonable construction buckle cable force of the cantilevered concrete arch bridge is completed, and the buckle cable force in construction is obtained;

[0043] S2, the anchor and the buckle tower 2 on the boundary pier are constructed;

[0044] S3, according to the buckle cable force in construction obtained by multi-objective solving, the main arch ring 3 is constructed, the anchor 1 is used as the back anchoring system of the main arch ring 3, the anchor 1 is anchored and connected with the buckle tower 2 through the anchor cable 4, and the other side of the buckle tower 2 is anchored and connected with the main arch ring 3 through the buckle cable 5.

[0045] Specifically, the process of constructing the main arch ring 3 is as follows:

[0046] ​T1, cantilever pouring the current segment arch box, and connecting the arch box with the buckle tower by the buckle cable 5, and tensioning the buckle cable 5 according to the buckle cable force obtained by multi-objective solving, after tensioning is completed, the longitudinal offset angle and the transverse offset angle of the buckle cable 5 are monitored in real time, when the longitudinal offset angle and the transverse offset angle of the buckle cable 5 exceed the preset limit value, an alarm is sent, the longitudinal offset angle refers to the offset angle in the vertical plane, and the transverse offset angle refers to the offset angle in the horizontal plane;

[0047] T2, repeat the above steps until the main arch ring 3 is completed, after the closure is completed, the buckle cable 5, the anchor cable and the buckle tower are removed.

[0048] The application provides a cantilever pouring arch bridge construction method based on multi-objective optimization, which obtains a parameterized finite element model through simulation parameterized modeling, obtains analysis results through analysis of the parameterized finite element model, and imports the analysis results into a multi-objective optimization program to realize multi-objective solving and obtain buckle cable forces meeting the requirements of multiple targets, so that multiple targets can be considered in the construction process.

[0049] Meanwhile, in order to realize real-time monitoring in the construction process and realize multiple engineering detection target monitoring, the longitudinal offset angle and the transverse offset angle of the buckle cable 5 are monitored in real time after tensioning of the buckle cable 5 is completed, whether the longitudinal offset angle and the transverse offset angle exceed the preset limit is judged to judge whether the working condition is normal, specifically, when the longitudinal offset angle and the transverse offset angle of the buckle cable 5 exceed the limit, it may indicate that the buckle cable 5 or the buckle tower is abnormal and needs to be checked in time, the longitudinal offset angle abnormality generally corresponds to the abnormal state of the buckle cable 5, and the transverse offset abnormality generally corresponds to the abnormal state of the buckle tower, for example, the buckle tower is inclined or twisted.

[0050] The way of multi-objective solving is fully recorded in the doctoral thesis of Dr. Peng Wenping: Long-span cantilever pouring concrete arch bridge construction period cable force optimization and arch ring stress regulation research, and will not be repeated here.

[0051] Further, the method further comprises the steps of: after the tensioning of the fastening cable 5 is completed, taking the lateral deviation angle of the fastening cable 5 that has been tensioned as a statistical object, calculating the coincidence degree of the value range of the lateral deviation angle of the fastening cable 5 that has been tensioned in adjacent unit time, the value range refers to the range between the minimum value and the maximum value of the lateral deviation angle of the fastening cable 5 in unit time, and if the coincidence degree in a certain adjacent unit time is lower than a preset value, and the coincidence degrees of the subsequent preset number of adjacent unit times meet the preset value, an alarm is sent. For example, the preset value of the coincidence degree of the value range of the lateral deviation angle of the fastening cable 5 in adjacent unit time is set to 90%, and in the next 2 hours, the unit time is 0.2 hours, a total of 10 units, if the preset value of the coincidence degree of the value range of the lateral deviation angle in adjacent unit time is between 93%-95% in the 10 units of time, it indicates that the situation is normal, if the coincidence degree of the value range of the lateral deviation angle of the fastening cable 5 is 88% between the 5th unit time and the 6th unit time, which is lower than the preset limit of 90%, and the coincidence degree of the subsequent adjacent unit time is restored, it indicates that the clamping tower may have tilted or twisted abnormally, and needs to be checked.

[0052] Further, the method further comprises the steps of: after the tensioning of the fastening cable 5 is completed, installing a deviation angle monitoring device 26 to realize real-time monitoring of the longitudinal deviation angle and the lateral deviation angle of the fastening cable 5, the deviation angle monitoring device 26 comprises: a fixed base 27, a support frame, two rotation monitoring units, a double-shaft motor 33, a first friction wheel 34 and a second friction wheel 35, the support frame is arranged on the fixed base 27, the double-shaft motor 33 is arranged on the support frame, the first friction wheel 34 and the second friction wheel 35 are respectively connected to the two shafts of the double-shaft motor 33, the rotation monitoring unit comprises a rotating ring 36 and a strain gauge 37, the rotating ring 36 is arranged on the support frame, the strain gauge 37 is arranged on the inner side wall of the rotating ring 36, the first friction wheel 34 and the second friction wheel 35 respectively contact one of the rotating rings 36 for driving the corresponding rotating ring 36 to rotate; after the tensioning of the fastening cable 5 is completed, the fixed base 27 is installed on the arch box, the fastening cable 5 passes through the two rotating rings 36, the strain gauge 37 contacts the fastening cable 5, and the double-shaft motor 33 is used to drive the rotating ring 36 to reciprocating rotate.

[0053] In the process of reciprocating rotation of the rotating ring 36, the strain gauge 37 is driven to rotate, and when the distance between the strain gauge 37 and the surface of the fastening cable 5 changes, the signal changes, so that the position change of the strain gauge 37 and the fastening cable 5 can be judged to judge the angle deviation of the fastening cable 5.

[0054] The angle detection by the strain gauge 37 has the advantage that the anchor cable is formed by winding steel strands, and the surface can have uneven conditions, and the detection by the strain gauge 37 can record the signal change rule of the strain gauge 37 during one rotation, and when the signal change rule has high consistency within a continuous time, it indicates that the state of the anchor cable 5 is stable, and when the signal change rule is switched from one rule state to another rule state, it indicates that the state of the anchor cable 5 has changed.

[0055] Specifically, the support frame comprises a support column 28 and a half-pipe type mounting plate, the support column 28 is arranged on the fixed base 27, and the half-pipe type mounting plate is arranged on the support column 28, two mounting grooves 30 are arranged on the half-pipe type mounting plate, the rotating ring 36 is limited in the mounting groove 30, and an opening should be arranged on the half-pipe type mounting plate to allow the first friction wheel 34 and the second friction wheel 35 to contact the rotating ring 36.

[0056] Further, in order to facilitate arrangement, the half-pipe type mounting plate comprises a plate body 29, a first sealing plate 31 and a second sealing plate 32, the first sealing plate 31 and the second sealing plate 32 are respectively fixed on both ends of the plate body 29 by bolts, and the mounting grooves 30 are respectively formed between the first sealing plate 31 and the plate body 29 and between the second sealing plate 32 and the plate body 29.

[0057] In order to limit the position of the rotating ring 36, the side of the mounting groove 30 is provided with a limiting rib, and the side of the rotating ring 36 is provided with a limiting groove matched with the limiting rib.

[0058] Further specifically, the strain gauge 37 is arranged in a U shape.

[0059] Further, the method further comprises the steps of monitoring the cable force of the anchor cable 5 after the tensioning of the anchor cable 5 is completed, and adjusting according to the monitoring result, so that the cable forces of all the anchor cables 5 meet the multi-target solving range requirements.

[0060] The embodiment provides a multi-target optimization-based cantilever arch bridge construction method, which obtains a parameterized finite element model through simulation parameterized modeling, obtains an analysis result through analysis of the parameterized finite element model, imports the analysis result into a multi-target optimization program, realizes multi-target solving, and obtains anchor cable forces meeting multi-target implementation requirements, so that multi-targets can be considered in the construction process.

[0061] In order to realize monitoring of the anchor cable 5 in the construction process, the cable force of the anchor cable 5 that has been tensioned is monitored in the process of constructing the main arch ring 3, and the monitoring result is adjusted, so that the cable forces of all the anchor cables 5 meet the multi-target solving range requirements.

[0062] Specifically, after the tensioning of the buckle cable is completed, a cable force detection device is installed to monitor the cable force of the buckle cable 5. The cable force detection device comprises a support 6, a pressure applying assembly and two gripping assemblies. The middle part of the support 6 is provided with an intermediate placement bin 7. The pressure applying assembly comprises an actuating device 11, a pressure gauge, a stroke measuring device 12 and a pressure block 13. The actuating device 11 is fixedly arranged on the support 6. The pressure gauge is arranged between the actuating device 11 and the pressure block 13. The pressure block 13 penetrates through the intermediate placement bin 7. The stroke measuring device 12 is arranged on the side of the pressure block 13 to measure the stroke of the pressure block 13. The two gripping assemblies are arranged at the two ends of the support 6. In operation, the gripping assemblies are used to grip the buckle cable 5. Then the actuating device 11 drives the pressure block 13 to apply pressure to the buckle cable 5. The real-time cable force is obtained according to the data of the pressure sensor and the stroke measuring device 12, so that the cable force can be conveniently tested.

[0063] Specifically, the actuating device 11 is a pneumatic cylinder or an electric push rod.

[0064] Specifically, the stroke measuring device 12 comprises a measuring wheel and a wheel speed meter. The periphery of the measuring wheel abuts against the pressure block 13. The wheel speed meter is used to measure the wheel speed of the measuring wheel. When the pressure block 13 moves, the measuring wheel rotates. The wheel speed meter measures the rotation of the measuring wheel, so that the stroke of the pressure block 13 is obtained.

[0065] In order to stably apply pressure to the buckle cable 5, the bottom of the pressure block 13 is provided with a first V-shaped slot 14. The buckle cable 5 is clamped in the V-shaped slot, so that the pressure block 13 can stably apply pressure.

[0066] Further, two ends of the support 6 are respectively provided with end setting bins 8, the bottom of the end setting bin 8 is provided with a first ring outlet 9, an abutting opening and a second ring outlet 10, the abutting opening is arranged between the first ring outlet 9 and the second ring outlet 10, the gripping assembly comprises a gripping ring 15, a driving wheel 17, a first acting wheel 18, a second acting wheel 19, a motor 20, an abutting block 21 and a pressing driving device 23, the driving wheel 17, the first acting wheel 18, the second acting wheel 19 and the motor 20 are arranged in the end setting bin 8, the motor 20 is connected with the driving wheel 17, used for driving the driving wheel 17 to rotate, the first acting wheel 18 and the second acting wheel 19 are respectively arranged on two sides of the driving wheel 17, driven to rotate by the driving wheel 17, the gripping ring 15 is provided with a notch 16, the notch 16 has a first end and a second end, in the working process, the gripping ring 15 is abutted by the first acting wheel 18 and / or the second acting wheel 19, and passes through the first ring outlet 9, the first end is located in the end setting bin 8, the second end enters and exits the end setting bin 8 through the second ring outlet 10, the pressing driving device 23 is arranged on the top of the end setting bin 8, the abutting block 21 is connected with the pressing driving device 23 and is inserted into the end setting bin 8, corresponding to the abutting opening.

[0067] In the above structure, when the motor 20 drives the driving wheel 17 to rotate, the driving wheel 17 drives the first acting wheel 18 and the second acting wheel 19 to rotate, the first acting wheel 18 and the second acting wheel 19 drive the gripping ring 15 to rotate, in the process of rotating, the gripping ring 15 has a state of being located in the end setting bin 8 and a state of not being located in the end setting bin 8, when being located in the end setting bin 8, it is in a gripping state, when not being located in the end setting bin 8, the buckle cable 5 can be placed in the gripping ring 15 through the notch 16, after entering the gripping ring 15, the first acting wheel 18 is rotated to make the notch 16 enter the end setting bin 8, so as to realize the gripping of the buckle cable 5, after the gripping is completed, the abutting block 21 is driven to move by the pressing driving device 23, the abutting block 21 extends out through the abutting opening and applies pressure to the buckle cable 5, so as to realize the stable gripping of the buckle cable 5. At the same time, after the abutting block 21 extends out, the abutting block 21 is located in the notch 16, so that the gripping ring 15 cannot move, that is, the locking of the gripping ring 15 is realized by the action of the abutting block 21.

[0068] In order to realize the stable pressure of the abutting block 21 to the buckle cable 5, the pressing driving device 23 is arranged as a pneumatic cylinder or an electric telescopic rod, and the bottom of the abutting block 21 is provided with a second V-shaped slot 22.

[0069] In order to realize good gripping effect, the central angle of the notch 16 corresponding to the gripping ring 15 is 60-150 degrees.

[0070] In order to rationally arrange space, the gripping assembly further comprises a first linkage wheel 24 and a second linkage wheel 25, a wheel circumference of the first linkage wheel 24 is fitted with the driving wheel 17 and the first acting wheel 18, and a wheel circumference of the second linkage wheel 25 is fitted with the driving wheel 17 and the second acting wheel 19.

[0071] It is to be noted that the relative terms such as first and second, and the like in the description are used for distinguishing between one entity or action from another, and do not necessarily require or imply any actual such relationship or order between such entities or actions. Moreover, the terms "comprising", "including", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional elements of that element. In addition, the use of the term "wherein" is used in the description is not intended to convey a limitation on the scope of the application but rather to identify a particular characteristic of the subject matter described. Furthermore, the words "a" and "an" are defined as taking the meaning of "one or more" unless explicitly stated otherwise.

[0072] The above description of the embodiments is for the purpose of enabling one of ordinary skill in the art to understand and use the application. The modifications and improvements to the embodiments made by those skilled in the art without departing from the spirit of the application are to be considered within the scope of the application. Therefore, the application is not limited to the embodiments described above, and the modifications and improvements made by those skilled in the art based on the disclosure of the application without departing from the scope of the application should be considered within the scope of the protection of the application.

Claims

1. A method for construction of a cast-in-place arch bridge based on multi-objective optimization, characterized in that, The method comprises the following steps: Simulate the structure in the whole construction process to establish a parameterized finite element model, analyze the established parameterized finite element model, extract relevant analysis results and output files, import the output files into a multi-objective optimization program, complete multi-objective optimization solution of the reasonable construction cable force of the cantilever cast concrete arch bridge, and obtain the cable force in the construction; Construction anchorage and interface pier; According to the cable force in the construction obtained by the multi-objective solution, the main arch ring is constructed, the anchorage is used as the back anchoring system of the main arch ring, the anchorage is connected with the tower by the anchor cable, and the other side of the tower is connected with the main arch ring by the cable. The specific process of constructing the main arch ring is as follows: Cantilever cast the current segment arch box, connect the arch box with the tower by the cable, tension the cable according to the cable force obtained by the multi-objective solution, monitor the longitudinal and transverse offset angles of the cable in real time after the tensioning is completed, and issue an alarm when the longitudinal and transverse offset angles of the cable exceed the preset limit value. The longitudinal offset angle refers to the offset angle in the vertical plane, and the transverse offset angle refers to the offset angle in the horizontal plane. Repeat the above steps until the main arch ring is completed, and then remove the cable, anchor cable and tower after the closure is completed. The method further comprises the following steps: after the tensioning of the cable is completed, install an offset angle monitoring device to monitor the longitudinal and transverse offset angles of the cable in real time. The offset angle monitoring device comprises a fixed base, a support frame, two rotating monitoring units, a double-shaft motor, a first friction wheel and a second friction wheel. The support frame is arranged on the fixed base, the double-shaft motor is arranged on the support frame, the first friction wheel and the second friction wheel are connected to the two shafts of the double-shaft motor respectively, the rotating monitoring unit comprises a rotating ring and a strain gauge, the rotating ring is arranged on the support frame, the strain gauge is arranged on the inner side wall of the rotating ring, the first friction wheel and the second friction wheel respectively contact one rotating ring to drive the corresponding rotating ring to rotate, and the double-shaft motor drives the rotating ring to rotate back and forth after the tensioning of the cable is completed. The strain gauge is arranged in a U shape.

2. The multi-objective optimization based construction method of a cast-in-place arch bridge according to claim 1, characterized in that, The method further comprises the following steps: after the tensioning of the cable is completed, take the transverse offset angle of the cable that has been tensioned as the statistical object, calculate the coincidence degree of the value range of the transverse offset angle of the cable that has been tensioned in the adjacent unit time, and issue an alarm if the coincidence degree in a certain adjacent unit time is lower than a preset value and the coincidence degrees of the subsequent preset number of adjacent unit times meet the preset value.

3. The multi-objective optimization based construction method of a cast-in-place arch bridge according to claim 1, wherein, The support frame comprises a support column and a half-pipe type placement plate. The support column is arranged on the fixed base, and the half-pipe type placement plate is arranged on the support column. Two placement grooves are arranged on the half-pipe type placement plate, and the rotating ring is limited in the placement grooves.

4. The method for constructing a cantilevered arch bridge based on multi-objective optimization according to claim 3, characterized in that: The half-pipe type setting plate comprises a plate body, a first sealing plate and a second sealing plate, the first sealing plate and the second sealing plate are fixed at two ends of the plate body by bolts, and the setting groove is formed between the first sealing plate and the plate body and between the second sealing plate and the plate body.

5. The multi-objective optimization based construction method of a cast-in-place arch bridge according to claim 3, characterized in that, The side of the setting groove is provided with a limiting rib, and the side of the rotating ring is provided with a limiting groove matched with the limiting rib.

6. The multi-objective optimization based construction method of a cast-in-place arch bridge according to any one of claims 1 to 5, characterized in that, The method further comprises the steps of: monitoring the cable force of the buckling cable after the buckling cable is tensioned, and adjusting according to the monitoring result, so that all the cable forces meet the multi-target solving range requirements.

7. The method for constructing a cantilevered arch bridge based on multi-objective optimization according to claim 6, characterized in that: The method further comprises the steps of: installing a cable force detection device after the buckling cable is tensioned to realize monitoring of the cable force of the buckling cable, the cable force monitoring device comprises a support, a pressure applying assembly and two gripping assemblies, the middle part of the support is provided with an intermediate setting bin, the pressure applying assembly comprises an action device, a pressure gauge, a stroke measuring device and a pressing block, the action device is fixedly arranged on the support, the pressure gauge is arranged between the action device and the pressing block, the pressing block passes through the intermediate setting bin, the stroke measuring device is arranged on the side of the pressing block and is used for measuring the stroke of the pressing block, and the two gripping assemblies are arranged at two ends of the support.

8. The multi-objective optimization based construction method of a cast-in-place arch bridge according to claim 7, characterized in that, The action device is a pneumatic cylinder or an electric push rod.

Images