CN103061247A - Method for enlarging moving angle of vertical rotation type movable bridge - Google Patents
Method for enlarging moving angle of vertical rotation type movable bridge Download PDFInfo
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- CN103061247A CN103061247A CN2013100056036A CN201310005603A CN103061247A CN 103061247 A CN103061247 A CN 103061247A CN 2013100056036 A CN2013100056036 A CN 2013100056036A CN 201310005603 A CN201310005603 A CN 201310005603A CN 103061247 A CN103061247 A CN 103061247A
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Abstract
The invention discloses a method for enlarging a moving angle of a vertical rotation type movable bridge. The method includes: utilizing a vertical side of the integral movable bridge as an XOY coordinate side when the movable bridge stays in unmovable state, taking the pivot center as an origin of coordinates, and setting barycenter of the movable bridge right above the pivot center. On the premise of certain rated power of a hydraulic power system of the movable bridge and in order to enlarge the moving angle of the movable bridge to the greatest extent, a barycenter shaft of a girder of the movable bridge is adjusted to superpose with a rotating bearing of a moving system, thus, when the moving angle is largest, the integral bridge (mainly comprising a box girder, a bridge floor pavement, a pivot and a counterweight box) generates bending moment to resist wind load by dead load, and thereby the requirement for rated power of the hydraulic power system of the movable bridge is lowered, and the moving angle of the movable bridge is enlarged. Meanwhile, mechanical loss of the hydraulic power system is reduced, energy resource is saved, and safety of the moving state of the movable bridge is guaranteed.
Description
Technical field
The present invention relates to a kind of method for designing of vertical rotary type movable bridge, relate in particular to a kind of method that increases vertical rotary type movable bridge opening angle.
Background technology
For the vertical rotary type movable bridge in the water environment that has large-tonnage ships to pass through, navigation clearance all can not be invaded in any position of pontic when requiring bridge to open, guarantee the navigation clear span in navigation channel, two kinds of approach are arranged usually, a kind of is the jib-length that increases movable bridge, namely stride the footpath, this has just increased the scale of engineering, and dynamical system and control system are also had higher requirement; Another kind method is to increase movable bridge opening angle α, because opening angle is larger, more can guarantee the navigation clear span.Now, maximum opening angle fixed axis vertical transfer formula movable bridge on the books is London Tower Bridge, England, its maximum opening angle is 83 degree, and the maximum opening angle of the vertical transfer movable bridge Barcelona, ESP bridge of maximum span is 75 degree in the world, and the maximum opening angle of the holy charles's railway bridge of the single page vertical transfer movable bridge U.S. of maximum span only is 60 degree in the world.Especially opening in the certain situation of mechanical system power, how increasing movable bridge cantilever opening angle is a greatly challenge, if opening angle is inadequate, then whole bridge system can't be set up, and can not satisfy the requirement of river course navigation.
Summary of the invention
For above-mentioned prior art, the invention provides a kind of method that increases vertical rotary type movable bridge opening angle, for making the movable bridge opening angle as far as possible large, the mass axis of adjusting the movable bridge girder by series of measures overlaps with the pivot of opening machinery, like this when being opened to maximum angle, the moment of flexure that the suffered wind load in girder windward side produces is minimum to the effect of machinery, thereby come broadening navigation clear span by increasing opening angle, simultaneously, the moment that the live loads such as the frictional force that the minimizing plant equipment is born and wind load produce, not only reduce mechanical loss, saved the energy, but also guaranteed the traffic safety of movable bridge.
In order to solve the problems of the technologies described above, a kind of method that increases vertical rotary type movable bridge opening angle of the present invention is when movable bridge is in not opening, the side elevation of whole bridge is as the XOY coordinate surface, and pivot center is as the origin of coordinates, with whole bridge barycenter be arranged on pivot center directly over.
Further, the present invention increases in the method for vertical rotary type movable bridge opening angle,
Drawn the ordinate Y of whole bridge barycenter by following equation group:
In the formula: X is the abscissa of whole bridge barycenter, X=0; I=1,2,3,4, Gi is respectively the weight of case beam, deck paving, pivot and the ballast box of whole bridge, Xi is respectively the abscissa of case beam, deck paving, pivot and the ballast box barycenter of whole bridge, and Yi is respectively the ordinate of case beam, deck paving, pivot and the ballast box barycenter of whole bridge; Draw thus the eccentric distance e=Y of the relative pivot center of whole bridge barycenter.
Compared with prior art, the invention has the beneficial effects as follows:
Because urban highway traffic requires bridge can open, so need to overcome the wind action of strong breeze when the cantilever of vertical rotary type opening angle is opened to maximum angle, be the most unfavorable processing condition of the maximum opening angle of restriction movable bridge this moment in the strong breeze scope.The present invention is in the certain situation of movable bridge hydraulic power system rated power, and is as far as possible large for making the movable bridge opening angle, overlap with the rolling bearing of open system by adjusting the whole bridge barycenter of movable bridge, and with whole bridge barycenter be arranged on pivot center directly over.Like this when being opened to maximum angle, whole bridge (mainly comprising case beam, deck paving, pivot and ballast box) deadweight produces the moment of flexure of opposing wind load, so just reduced the requirement to movable bridge hydraulic power system rated power, play the effect that increases the movable bridge opening angle, also reduced simultaneously the hydraulic power system mechanical loss, save the energy, guaranteed the safety of movable bridge opening.
Description of drawings
Fig. 1 is case study vertical rotary type movable bridge structure of main bridge schematic diagram of the present invention;
Fig. 2 is case study vertical rotary type movable bridge of the present invention wind vector figure when opening 85 °.
Fig. 3 is that case study vertical rotary type movable bridge of the present invention is opened movable bridge position of centre of gravity schematic diagram under the maximum angle state;
Fig. 4 is not movable bridge position of centre of gravity schematic diagram under the opening of case study vertical rotary type movable bridge of the present invention;
Among the figure: 1-case beam, 2-deck paving, 3-pivot, 4-ballast box, α-opening angle.
The specific embodiment
Below in conjunction with the specific embodiment the present invention is described in further detail.
As shown in Figure 1, a kind of method that increases vertical rotary type movable bridge opening angle of the present invention, its main thought is: when movable bridge was in not opening, the side elevation of whole bridge was as the XOY coordinate surface, pivot center is as the origin of coordinates, with whole bridge barycenter be arranged on pivot center directly over.
Drawn the ordinate Y of whole bridge barycenter by following equation group:
In the formula: X is the abscissa of whole bridge barycenter, X=0; I=1,2,3,4, Gi is respectively the weight of case beam, deck paving, pivot and the ballast box of whole bridge, Xi is respectively the abscissa of case beam, deck paving, pivot and the ballast box barycenter of whole bridge, and Yi is respectively the ordinate of case beam, deck paving, pivot and the ballast box barycenter of whole bridge; Thereby draw the eccentric distance e=Y of the relative pivot center of whole bridge barycenter.
Research material:
Research material is the rotatable movable bridge of a fixed rotating shaft formula hydraulic vertical.Mainly by whole bridge, Thin-Wall Piers is basic, base bearing mechanism, pin tooth rail, span centre and afterbody lock device, hydraulic power system, the compositions such as control system.When main bridge hoisted, control system control lock shrank, but whole bridge enters opening, and control hydraulic system oil cylinder shrinks, and bearing rotates, and produces the lifting moment of torsion for whole bridge, and movable bridge is stable to hoist; When main bridge is transferred, the elongation of control system control hydraulic jack, bearing rotates, and produces for whole bridge and transfers moment of torsion, and winner's bridge can steadily be transferred; When main bridge drops to level, when dropping down onto bridge pier, rely on the ballast system on the Thin-Wall Piers basis, the snubber of girder steel tail end setting effectively slows down the impact force that steel bridge descends, and the locking of the end pin in girder steel tail end and the ballast system, the unlatching of whole movable bridge and the process of transferring finish.Wind load increased with the increase of opening angle when this kind movable bridge was opened, and the power-handling capability of hydraulic power system also needs to increase thereupon.
The section that this movable bridge is positioned at has large-tonnage ships to pass through, and navigation clearance all can not be invaded in any position of pontic when requiring bridge to open.The design formulas of navigation clear span: H=2L-2L*cos(α); Wherein, H is the navigation clear span in navigation channel, and L is the one-sided jib-length of movable bridge, and α is the movable bridge opening angle.Can be drawn by formula, guarantee the navigation clear span H in navigation channel, two kinds of approach are arranged, a kind of is the jib-length that increases movable bridge, namely stride the footpath, the scale that this has just increased engineering has increased construction investment, and is subject to the restriction of hydraulic power system and the control system technical level of present stage movable bridge.Another kind method is to increase movable bridge opening angle α; Opening angle is larger, more can guarantee the navigation clear span.According to the investigation to the peak power output of vertical rotary type movable bridge hydraulic power system, the rational bridge clear span of this bridge can not be greater than 68 meters.Calculate thus when opening maximum, this movable bridge cantilever opening angle reaches 85 degree.Maximum opening angle fixed axis vertical transfer formula movable bridge on the books is London Tower Bridge, England till now, its maximum opening angle is 83 degree, and the maximum opening angle of the vertical transfer movable bridge Barcelona, ESP bridge of maximum span is 75 degree in the world, and the maximum opening angle of the holy charles's railway bridge of the single page vertical transfer movable bridge U.S. of maximum span only is 60 degree in the world.So it is greatly challenges that movable bridge cantilever opening angle reaches 85 degree, if but opening angle does not reach 85 degree, and then whole bridge system can't be set up, and can not satisfy the requirement of river course navigation.
At first, find out under the least favorable load action the required moment that bears of hydraulic power system.Urban highway traffic requires bridge can open in the strong breeze scope, so need to overcome the wind action of strong breeze when cantilever is opened to maximum angle, is the most unfavorable processing condition of the maximum opening angle of restriction movable bridge this moment.And be difficult to realize with existing vertical rotary type movable bridge hydraulic power system technical condition by the required power of load moment M this moment that overcomes that calculates.Therefore, the present invention makes whole bridge be conducive to the make that the cantilever opening angle reaches 85 degree when opening by calculating the barycenter of adjusting whole bridge, makes engineering smooth.
As shown in Figure 4, in opening not, movable bridge is under two cantilever positions, the self gravitation that side is subject in the whole spanning is larger than the distolateral self gravitation that is subject to of whole bridge, the center of gravity of total is not or not the pivot place, but near girder span centre side, to overcome structural focus when the rotation of hydraulic power system driving pivot is opened movable bridge like this to the moment of flexure acting of pivot.By carrying out counterweight at bridge tail end configuration metal weights piece, calculate the barycenter of adjusting whole bridge, make the barycenter of whole bridge this moment be positioned at the pivot top, and overlap with the pivot shaft center line, with the eccentric throw value of pivot center be e, this movable bridge eccentric distance e value is calculated as follows:
At first, when being located at movable bridge and being in not opening, the side elevation of whole bridge is as the XOY coordinate surface, pivot center is as the origin of coordinates, in cad software, set up first whole bridge threedimensional model, again center-of-mass coordinate and the weight of whole bridge various piece (comprising case beam, deck paving, ballast box and pivot) are found from graphic file, as shown in the table, wherein x and y are the coordinate figure of case beam, deck paving, ballast box and pivot each several part barycenter, and G is respectively the weight of case beam, deck paving, ballast box and pivot each several part.By whole bridge barycenter abscissa design formulas X=Σ Gi*Xi/ Σ Gi, the abscissa value X of whole bridge barycenter adjusts as for overlapping with the pivot center line, and namely X=0 brings data into formula Σ Gi*Xi/ Σ Gi=0, and can draw ballast box weight is 7831kN.Again by barycenter ordinate design formulas Y=Σ Gi*Yi/ Σ Gi, the related data of case beam, deck paving, bearing and ballast box is brought into, can obtain the ordinate value Y=0.278 rice of whole bridge barycenter, because be as the origin of coordinates take pivot center, so ordinate value Y value of whole bridge barycenter, be this movable bridge eccentric distance e=0.278 meter, whole bridge barycenter be arranged on pivot center directly over.
| ? | The calculating of whole bridge barycenter | x(m) | y(m) | G(kN) |
| 1 | The case beam | 10.462 | 0.922 | 5869 |
| 2 | Deck paving | 13.900 | 2.120 | 710 |
| 3 | Ballast box | -9.100 | -0.351 | 7831 |
| 4 | Pivot | 0.000 | 0.000 | 550 |
| ? | Whole bridge barycenter | 0.000 | 0.278 | 14958 |
When movable bridge is opened gradually: when just opening, whole bridge is in a basic balance at pivot shaft center line two ends, and hydraulic power system drives pivot and rotates, and only need overcome the friction working in the transmission process; When rotational angle increases gradually, the wind load that whole bridge is subject to increases gradually, and wind vector figure when Fig. 2 shows this movable bridge and opens 85 ° is by formula M
0=e*sin(α) * G(M wherein
0Moment of flexure for whole bridge deadweight generation, e is the eccentricity value of whole bridge barycenter and pivot center, α is the movable bridge opening angle, G is whole bridge deadweight) calculate the moment of flexure that whole bridge deadweight produces, as shown in Figure 3, because being arranged at the structure wind-engaging, the barycenter of structure carries a side, pivot center is produced counterclockwise moment of flexure, thereby wind load has been produced negative function to the clockwise moment of flexure that pivot center produces, and this is favourable to hydraulic power system, has improved the power of hydraulic power system.Draw by analysis, this has the wind pressure coefficient maximum of its windward side of movable bridge of 85 degree opening angles, and leeward side is close to not wind-engaging effect; The wind surface wind stress factor increases gradually along the difference of pontic, and the wind pressure coefficient at middle part, windward side is obviously greater than (bottom and top) both sides wind pressure coefficient; Along with the increase of opening angle, the wind pressure coefficient of movable bridge windward side obviously increases, and leeward side bridge floor wind pressure coefficient is less.
To sum up, this case study is by adjusting the relative position relation of whole bridge barycenter and pivot center, be about to whole bridge barycenter be arranged on pivot center directly over, make the power of the hydraulic power system of vertical rotary type movable bridge satisfy the needs of the most unfavorable processing condition of the maximum opening angle of movable bridge, the opening angle that has guaranteed the movable bridge girder steel reaches 85 degree, reduce the required power of transmission system, reduced mechanical loss, and improved the safety stock of movable bridge under opening.
Although top invention has been described in conjunction with figure; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; in the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (2)
1. method that increases vertical rotary type movable bridge opening angle is characterized in that:
When movable bridge was in not opening, the side elevation of whole bridge was as the XOY coordinate surface, and pivot center is as the origin of coordinates, with whole bridge barycenter be arranged on pivot center directly over.
2. the method for described increase vertical rotary type movable bridge opening angle according to claim 1 is characterized in that:
Drawn the ordinate Y of whole bridge barycenter by following equation group:
In the formula: X is the abscissa of whole bridge barycenter, X=0; I=1,2,3,4, Gi is respectively the weight of case beam, deck paving, pivot and the ballast box of whole bridge, Xi is respectively the abscissa of case beam, deck paving, pivot and the ballast box barycenter of whole bridge, and Yi is respectively the ordinate of case beam, deck paving, pivot and the ballast box barycenter of whole bridge;
Eccentric distance e=the Y of the relative pivot center of whole bridge barycenter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351111A (en) * | 2016-10-31 | 2017-01-25 | 中国葛洲坝集团三峡建设工程有限公司 | Split type bottom pushing movable road bridge |
| CN110804932A (en) * | 2019-12-12 | 2020-02-18 | 广州揽睿路桥设计有限公司 | Bridge floor can open pendulum-type slope tied arch bridge |
| CN113718627A (en) * | 2021-09-29 | 2021-11-30 | 中国华西企业有限公司 | Construction method for adjusting gravity center of open bridge body |
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| UA71700A (en) * | 2003-04-22 | 2004-12-15 | Veniamin Leibovych Brodskyi | Opening drawbridge and method for operating it |
| CN102251466A (en) * | 2011-04-27 | 2011-11-23 | 武桥重工集团股份有限公司 | Fixed rotating shaft type hydraulic opening bridge |
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2013
- 2013-01-07 CN CN2013100056036A patent/CN103061247A/en active Pending
Patent Citations (3)
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| NL16433C (en) * | ||||
| UA71700A (en) * | 2003-04-22 | 2004-12-15 | Veniamin Leibovych Brodskyi | Opening drawbridge and method for operating it |
| CN102251466A (en) * | 2011-04-27 | 2011-11-23 | 武桥重工集团股份有限公司 | Fixed rotating shaft type hydraulic opening bridge |
Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351111A (en) * | 2016-10-31 | 2017-01-25 | 中国葛洲坝集团三峡建设工程有限公司 | Split type bottom pushing movable road bridge |
| CN110804932A (en) * | 2019-12-12 | 2020-02-18 | 广州揽睿路桥设计有限公司 | Bridge floor can open pendulum-type slope tied arch bridge |
| CN113718627A (en) * | 2021-09-29 | 2021-11-30 | 中国华西企业有限公司 | Construction method for adjusting gravity center of open bridge body |
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Application publication date: 20130424 |