CN101016728A - Construction monitoring method for exchanging course of half/through arch bridge suspender - Google Patents
Construction monitoring method for exchanging course of half/through arch bridge suspender Download PDFInfo
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- CN101016728A CN101016728A CN 200710037205 CN200710037205A CN101016728A CN 101016728 A CN101016728 A CN 101016728A CN 200710037205 CN200710037205 CN 200710037205 CN 200710037205 A CN200710037205 A CN 200710037205A CN 101016728 A CN101016728 A CN 101016728A
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Abstract
The invention relates to a construction detection used in the hanger rod exchange of middle and lower arc bridges. The invention comprises that building arc bridge spatial reference limit model, analyzing the force state of bridge, simulating the whole construction, the construction uses arc bridge three-dimension position detection, bridge sink detection, displacement detection between arc rib and beam, hanger rod force detection, structural stress detection and long-time detection, then comparing the data of detection with the reference limit model, to correct the model, to be used in next reference limit model. The invention can confirm the flexibility less than theory value and confirm the hang force in design range, to improve safety or the like.
Description
Technical field
The invention belongs to technical field of bridge engineering, be specifically related to a kind of in, the construction monitoring method in the half/through arch bridge suspender replacing process.
Background technology
Along with Chinese economic development and major construction projects, traffic volume of highway constantly increases, appearance and the increase and the overload phenomenon etc. of the increase of heavy vehicle, the transportation of transfiniting, the highway bridge load is on the rise, the hypodynamic situation of ubiquity bridge bearing, the bridge built of 60-70 age in 20th century particularly, the design load standard is lower, and old in addition bridge portion is aging, damaged, and contradiction is more come outstanding between the supporting capacity of bridge and the vehicular load that passes through.It is a significant problem of very being concerned about in the world at present that the transformation of bridge is reinforced, and countries in the world all begin to drop into the research work that a large amount of man power and materials carries out this respect.
Suspension rod be in, the crucial Force transmission parts of lower bearing arch bridge, its bearing capacity directly affects the supporting capacity of bridge.At present the arch bridge that built up just under arms of China has more than 40,000, during wherein the overwhelming majority belongs to, multiplier arch bridge down.And existing example shows, the useful life of suspension rod generally only is 3-16, and this is the design basis its 100 years that is significantly less than bridge, that is to say that the replacing to arch bridge suspender is unavoidable.But the example of replacing that carries out suspension rod at present is actually rare, carry out design and construction unit's experience in this respect that arch bridge suspender changes and embody wretched insufficiency, therefore study and a kind ofly in the constructing operation that arch bridge suspender is changed, carry out effective and reasonable construction monitoring method and just seem especially important.
Summary of the invention
The object of the present invention is to provide a kind of reliable and effective in, the construction monitoring method in the half/through arch bridge suspender replacing process.
The present invention propose in, the construction monitoring method in the half/through arch bridge suspender replacing process, its concrete steps comprise:
(1) sets up arch bridge space reference FEM (finite element) model, analyze the stress of bridge construction, and the work progress of whole suspender replacement is carried out sunykatuib analysis;
(2) work progress adopts all-the-way tracking monitoring and long term monitoring, all-the-way tracking monitoring comprises that cable force monitoring and structural stress are monitored in relative displacement monitoring between the observation of arch bridge three-dimensional localization, bridge floor settlement monitoring, arch rib and binder, the suspender replacement process, and long term monitoring comprises monitoring arch bridge suspender operation stage and working environment thereof;
(3) data and the middle benchmark FEM (finite element) model of step (1) that regularly obtains in step (2) observation process compared, again benchmark FEM (finite element) model parameter in the step (1) is revised, obtain being used for the benchmark FEM (finite element) model of next stage.
Among the present invention, described arch bridge three-dimensional localization observation can be adopted total powerstation to lay the control point and lay three-dimensional monitoring point, in three-dimensional monitoring point reflecting piece is set.
Among the present invention, described bridge floor settlement monitoring can adopt level gauge every suspension rod relevant position and arch springing lay settlement observation point.
Among the present invention, the relative displacement monitoring between described arch rib and binder can adopt convergence gauge to lay the convergence limit every suspension rod both sides.
Among the present invention, cable force monitoring can comprehensively adopt oil pressure gauge to measure method and pressure sensor mensuration in the described suspender replacement process.
Among the present invention, the structural stress monitoring can be adopted and paste the static resistance foil gauge.
Among the present invention, long term monitoring refers to the suspension rod force-bearing situation of bridge operation phase and working environment thereof are carried out the monitoring stage, and adopts pressure sensor and vibration frequency measure method, detects the rope force and stress of suspension rod.
Operating principle of the present invention is as follows: the present invention is according to the loading characteristic of arch bridge, being set at of suspender replacement construction monitoring with distortion and the taking all factors into consideration of internal force, distortion and internal force control are then taked following control strategy according to the self character and the job practices of arch bridge: based on Suo Li and elevation, take into account structural stress control, the influence that variations in temperature is controlled the replacing suspension rod of taking measures to avoid as far as possible and reduce.
For this reason, the present invention has set up Structural Analysis Model accurately in construction monitoring, and reinforcement parameter identification selects that temperature error is little, stable performance, antijamming capability be strong, is fit to the measuring system of long-term observation.
The present invention sets up the arch bridge spatial finite element model and calculates and analyze, and the work progress of whole suspension rod is carried out sunykatuib analysis.In traditional bridge computational methods,, analytical methods such as many body system hypothesis, many hypothesises of plane mechanism, top and the bottom structure hypothesis, the hinged and hypothesis that is rigidly connected have been continued to use for many years for the bridge construction with reality is converted into mechanical model.Over nearly 20 years, along with improvement of computer science, the development of computer simulation technique, analysis of bridge structure gradually from plane computations to the SPATIAL CALCULATION transition.By the space structures simulation analysis, intuitive geometry shape according to all bearing carriers of full-bridge, locus and mechanical characteristic, adopt multiple unit such as entity, plate shell, beam, bar, rope to be simulated respectively, and all unit combination are become complete, the unified analysis system of bed rearrangement bridge, the spatiality of real simulation structural element truly reflects fringe conditions and loading condition, simulate corresponding load case and carry out computational analysis, obtain more detailed, accurate and reliable analysis result thus.
Construction monitoring is the basis of bridge construction control, and in the construction that the reinforcing of bridge is keeped in repair, more complicated because of its work progress, it is more to influence the smooth factor that realizes of its construction control target.Therefore, in construction, must monitor, to obtain the data and the technical information of reflection condition of construction, constantly according to the actual conditions correction perfect condition of original each construction stage of determining to important parameter of structure design, state parameter.
The all-the-way tracking monitoring comprises in the work progress of the present invention: cable force monitoring, structural stress monitoring in the relative displacement monitoring between the observation of suspension bridge three-dimensional localization, bridge floor settlement monitoring, arch rib and binder, the suspender replacement process.
(1) arch bridge three-dimensional localization observation
This monitoring is for the distortion of configuration before and after changing of monitoring arch bridge, guarantees that bulk deformation is in the scope of security clearance.The measuring apparatus that can drop into is a total powerstation.
(2) bridge floor settlement monitoring
This monitoring runs through the overall process of whole suspender replacement, is in order to guarantee in the replacing process, in the scope of the security clearance that is deposited in control of bridge floor.The instrument that can drop into is a precision level.
(3) arch rib and longeron obtain or crossbeam between relative displacement monitoring
This monitoring runs through the overall process of whole suspender replacement, is in order to guarantee that in the replacing process relative displacement between arch rib and longeron or crossbeam changes in the scope of the security clearance of control.The instrument that can drop into is a convergence gauge.
(4) cable force monitoring in the suspender replacement process
This monitoring runs through the overall process of whole suspender replacement, is in order to guarantee that in the replacing process Suo Li of suspension rod changes in the scope of the security clearance of control.
(5) structural stress monitoring
This monitoring runs through the overall process of whole suspender replacement, is in order to guarantee that in the replacing process STRESS VARIATION of bridge construction is in the scope of the security clearance of control.The instrument that can drop into is the static resistance foil gauge.
Long term monitoring of the present invention refers to that bridge construction is carried out long-term health monitoring to be meant bridge construction and the working environment thereof of operation stage are monitored with detecting, its purpose be exactly the information analysis structure that obtains according to monitoring health status, estimate bridge and bear quiet, the ability of dynamic load and the security reliability of structure, for operation, safeguard, management provides decision-making foundation.In order better to monitor bridge at the constructional aspect of operation stage and the stress performance after the better assessment bridge strengthening, can grasp state of the art and the load effect of bridge in long-term the operation, improve the safety of bridge use.Simultaneously, can also coordinate monitoring result and daily defect inspection record, by comparative analysis, the reason that finds defective to produce, thus in time renovate disease, prolong bridge life.So it is carried out long term monitoring is very important.In view of the loading characteristic and the reality of the blue or green pocket bridge of leaf, a kind of method of long term monitoring promptly regularly bridge detected by more pre-buried sensors after our suggestion was adopted this bridge, with the gained data duty of bridge was evaluated.
The main contents of long term monitoring: comprise the steeve tension monitoring, suspension rod is the main Force transmission parts of concrete-filled steel tubes arch bridge, mobile load and bridge deck are delivered to main arch from heavy load by suspension rod, steeve tension not only is related to the stress of main arch, and directly has influence on bridge floor line style and driving comfort level.
Monitoring method: suspension rod (new suspension rod) the replacing stage pre-buried can be for the pressure sensor of long term monitoring, to be used to detect its rope force and stress.Suo Li result can be read in instrument by the secondary that inserts and directly be read.
The inventive method is on the basis of closed feedback control, adds the parameter identifying of a system, is construction, and------parameter identification---is analyzed and---is revised---prediction---cyclic process of construction in monitoring.In work progress, the stress and the The model calculation of comparative structure measurement are at any time carried out parameter adjustment (identification) according to both errors, make the output result of model consistent with the result of actual measurement.Utilize the computation model parameter of revising, recomputate the perfect condition of each construction stage, structure is controlled by feedback.After each operating mode is returned the survey data of structure, carry out analysis-by-synthesis and judgement to these data, understanding already present error, and carry out the source of error analysis simultaneously.On this basis, the reasons of error that produces is eliminated as far as possible, provide next operating mode construction control instruction, on-the-spot formation circulated benignly.
The method that the present invention proposes is in the construction that arch bridge suspender is changed, the distortion and the internal force situation of change of all-the-way tracking monitoring suspender force, associated components, for optimal design and constructure scheme provide foundation, should guarantee that amount of deflection does not allow to surpass theoretical calculated value, guarantee again in the scope of design of Suo Li, the stress that will guarantee each main force part simultaneously guarantees that structure in the suspender replacement safety of construction period, guarantees carrying out smoothly of suspender replacement construction in the scope of envisioning and allowing.
Description of drawings
Fig. 1 is that embodiment 1 arch bridge is arranged diagram.
Fig. 2 is embodiment 1 a benchmark limited element calculation model diagram.
Fig. 3 is that embodiment 1 three-dimensional monitoring point is arranged.Wherein, be that three-dimensional measuring point is laid schematic diagram on bridge north side bridge arch, the binder (a), (b) be three-dimensional measuring point is laid elevational schematic view on bridge southern side bridge arch, the binder, (c) be schematic diagram is laid at bridge three-dimensional coordinate measurement control point.
Fig. 4 is that embodiment Bridge 1 face settlement monitoring point is arranged.
Fig. 5 is embodiment 1 a convergence gauge installation position.
The specific embodiment
Further specify the present invention below by embodiment.
Embodiment 1:
Certain arch bridge arranges that as Fig. 1 calculating and striding the footpath is 71.6 meters, and losing height is 14.32 meters, and bridge floor is arranged as 3.25 (sidewalk)+1.6 (binder)+18.0 (roadway)+1.6 (binder)+3.25 (sidewalk), and navigation requires 300 tonnes.Design load: vapour-20, hang-100, pedestrian load 4KN/m2.
Construction monitoring method in the arch bridge suspender replacing process, its step is specific as follows:
1, setting up the space reference FEM (finite element) model calculates and analyzes.The spatial finite element model of Fig. 2 for setting up, model is made as beam element with arch rib, horizontal stroke, binder, and suspension rod is made as truss element.Wherein beam element is 129,34 of truss elements.
2, monitoring means
A, three-dimensional monitoring, the monitoring point layout, as shown in Figure 3.
1. lay at the control point: in the bridge both sides, the two sides, canal respectively lay a control point, the geodetic quadrangle shape is formed at the control point, and the control point installation position is seen the schematic diagram of layouting.
2. three-dimensional monitoring point: reflecting piece is laid in three-dimensional monitoring point, 5 reflecting piece of equidistant laying on binder, on bridge arch, lay 7 reflecting piece, suitably encrypt at the place at vault, whole engineering is laid 24 reflecting piece altogether, and the schematic diagram of layouting (reflecting piece at arch rib position is installed and had the work high above the ground problem) is seen in the position of layouting.When being installed, reflecting piece should note the installed surface cleaning totally reflecting piece being affixed on the relevant position getting final product.
B, bridge floor settlement monitoring: the monitoring point layout, as shown in Figure 4.
1. settlement observation point installation position: lay a bit at every suspension rod correspondence position, one side is laid 17 of settlement monitoring points, wherein, a side from the D3 point to the D19 point, opposite side from the D24 point to the D40 point, both sides each 2 point that stretch out again, for the D20 point to the D21 point, the D1 point is to the D2 point, the D22 point is to the D23 point, the D41 point is to the D42 point, and whole engineering is laid 42 points altogether, and the cloth point diagram is seen in the position of layouting.
2. settlement observation point distribution method: punch in the relevant position with Churn drill, the level nail is placed in the hole, cement injection, maintenance to 7 is carried out preliminary survey after day length of time.
Relative displacement monitoring between C, arch rib and longeron or crossbeam, the monitoring point is arranged as shown in Figure 5.
1. convergence gauge installation position: lay two convergence limits when every suspension rod construction, promptly each cloth of suspension rod both sides in the construction is one.Whole project is totally 34 suspension rods, lays convergence 68 limits, limit altogether.The every suspension rod construction convergence situation of layouting is seen the cloth point diagram.
2. the mounting method of convergence gauge: at suspension rod two side perforatings, the expansion bolt that drop hanger is arranged is fixed in the suspension rod both sides with Churn drill, convergence gauge is installed between the expansion bolt.Need guarantee the collimation of convergence gauge and suspension rod during installation, so that the data of being obtained have bigger reliability.
Cable force monitoring can comprehensively adopt oil pressure gauge to measure method and pressure sensor mensuration in D, the suspender replacement process, and is specific as follows:
(a) oil pressure gauge measures method
Drag-line uses hydraulic jack stretch-draw, because hydraulic pressure and tension force in the stretch-draw oil cylinder of jack have direct relation, so, just can try to achieve Suo Li as long as measure the pressure of tension cylinder.
(b) pressure sensor mensuration
Finger is the setting pressure sensor under the pull bar anchor, reads by secondary meter and draws cable force.The accuracy height that this method measures, stability better is easy to long term monitoring.For Suo Li influence to contiguous suspension rod (refer to newly change suspension rod) is changed in the bar process in better monitoring here, and be convenient to the duty of bridge is carried out long-term monitoring, therefore in the new suspension rod of changing, select to install the pressure sensor of this permanent type.The method of monitoring be in stride with short steeve and be in construction stage prepackage, be used to detect its Suo Li.Require certainty of measurement within 5%.
E, long term monitoring adopt oil pressure gauge to measure method and vibration frequency measurement method is carried out long term monitoring, and it is specific as follows:
(a) oil pressure gauge measures method
Drag-line uses hydraulic jack stretch-draw, because hydraulic pressure and tension force in the stretch-draw oil cylinder of jack have direct relation, so, just can try to achieve Suo Li as long as measure the pressure of tension cylinder.
(b) vibration frequency measures method
Utilize the characteristics of the corresponding relation that exists between the vibration frequency of Suo Li and rope, when parameters such as the length of known rope, two ends restraint condition, distributed mass, by measuring the vibration frequency of rope, and then calculate the pulling force of rope.
(3) each stage in step (2) work progress, regularly the data and step (1) the benchmark FEM (finite element) model of gained compare, again benchmark FEM (finite element) model in the step (1) is revised at last, obtained being used for the benchmark FEM (finite element) model of single order down, so allow model more near practical structures.
Claims (7)
1, in a kind of, the construction monitoring method in the half/through arch bridge suspender replacing process, it is characterized in that concrete steps comprise:
(1) sets up arch bridge space reference FEM (finite element) model, analyze the stress of bridge construction, and the work progress of whole suspender replacement is carried out sunykatuib analysis;
(2) work progress adopts all-the-way tracking monitoring and long term monitoring, all-the-way tracking monitoring comprises that cable force monitoring and structural stress are monitored in relative displacement monitoring between the observation of arch bridge three-dimensional localization, bridge floor settlement monitoring, arch rib and binder, the suspender replacement process, and long term monitoring comprises monitoring arch bridge suspender operation stage and working environment thereof;
(3) data and the middle benchmark FEM (finite element) model of step (1) that regularly obtains in step (2) observation process compared, again benchmark FEM (finite element) model in the step (1) is revised, obtain being used for the benchmark FEM (finite element) model of next stage.
2, in according to claim 1, the construction monitoring method in the half/through arch bridge suspender replacing process, it is characterized in that described arch bridge three-dimensional localization observation adopts total powerstation to lay the control point and lay three-dimensional monitoring point, in three-dimensional monitoring point reflecting piece is set.
3, in according to claim 1, the construction monitoring method in the half/through arch bridge suspender replacing process, it is characterized in that described bridge floor settlement monitoring adopts level gauge to lay settlement observation point every suspension rod relevant position, 2 to 3 points again stretch out in the both sides of suspension rod.
4, in according to claim 1, the construction monitoring method in the half/through arch bridge suspender replacing process, it is characterized in that the relative displacement monitoring between described arch rib and binder adopts convergence gauge to lay the convergence limit every suspension rod both sides.
5, in according to claim 1, the construction monitoring method in the half/through arch bridge suspender replacing process, it is characterized in that cable force monitoring comprehensively adopts oil pressure gauge to measure method and pressure sensor mensuration in the described suspender replacement process.
6, in according to claim 1, the construction monitoring method in the half/through arch bridge suspender replacing process, it is characterized in that the structural stress monitoring adopts the static resistance foil gauge.
7, in according to claim 1, the construction monitoring method in the half/through arch bridge suspender replacing process, it is characterized in that long term monitoring adopts pressure sensor and vibration frequency measure method, detect the rope force and stress of suspension rod.
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| CN111576230A (en) * | 2020-05-28 | 2020-08-25 | 广西交科集团有限公司 | Method for controlling lifting displacement of lattice beam of arch bridge with small construction disturbance |
| CN111576230B (en) * | 2020-05-28 | 2021-09-28 | 广西交科集团有限公司 | Method for controlling lifting displacement of lattice beam of arch bridge with small construction disturbance |
| CN112649046A (en) * | 2020-12-22 | 2021-04-13 | 中建八局第三建设有限公司 | Overall pushing monitoring method for whole-process simulation tied arch bridge |
| CN112885096A (en) * | 2021-02-05 | 2021-06-01 | 同济大学 | Bridge floor traffic flow full-view-field sensing system and method depending on bridge arch ribs |
| CN112854005A (en) * | 2021-02-25 | 2021-05-28 | 广西路桥工程集团有限公司 | Bridge anchor pipe positioning method |
| CN113202190A (en) * | 2021-03-26 | 2021-08-03 | 上海建工集团股份有限公司 | Construction control method of space cable structure based on component original state |
| CN113605251A (en) * | 2021-09-16 | 2021-11-05 | 广西大学 | Arch bridge cable adjusting method |
| CN113605251B (en) * | 2021-09-16 | 2022-11-29 | 广西大学 | Arch bridge cable adjusting method |
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