CN102535348A - Method for tensioning stayed cables of hinged tower cable stayed bridge - Google Patents
Method for tensioning stayed cables of hinged tower cable stayed bridge Download PDFInfo
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- CN102535348A CN102535348A CN201210067088XA CN201210067088A CN102535348A CN 102535348 A CN102535348 A CN 102535348A CN 201210067088X A CN201210067088X A CN 201210067088XA CN 201210067088 A CN201210067088 A CN 201210067088A CN 102535348 A CN102535348 A CN 102535348A
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Abstract
The invention discloses a method for tensioning stayed cables of a hinged tower cable stayed bridge. The cable stayed bridge comprises a beam body, a bridge tower and the stayed cables, wherein the bridge tower consists of a main tower positioned above the beam body and a lower tower column rigidly connected with the beam body; and the main tower is hinged with the lower tower column. The method for tensioning the stayed cables comprises the following steps of: constructing a bridge foundation which comprises a pile foundation, a bearing platform and a pier column, and constructing the lower tower column while erecting the beam body; constructing the main tower hinged with the lower tower column, and hanging the stayed cables positioned on one side of the main tower; and hanging and tensioning the stayed cables positioned on the other side of the main tower. The method for tensioning the stayed cables of the hinged tower cable stayed bridge can be widely applied to the construction of cable stayed bridges of various structure systems, the work efficiency of tensioning the stayed cables can be greatly improved, and construction accuracy is ensured; and enough technical support and theoretical guarantee are provided for the construction of the cable stayed bridges in future, and the method has great practical significance.
Description
Technical field
The present invention relates to a kind of method for stretching of cable stayed bridge suspension cable, relate in particular to a kind of method for stretching that cuts with scissors the pylon cable-stayed bridge suspension cable.
Background technology
Cable stayed bridge is claimed Cable stayed bridge again, is the many suspension cables of beam body and function directly are pulled in a kind of bridge on the bridge tower, is by bridge tower, the suspension cable that is drawn of pressure-bearing and holds a kind of structural system that curved beam body combines.It can regard that suspension cable replaces the multispan elastomeric bearing continuous beam of buttress as.It can make, and moment of flexure reduces in the beam body, reduces building height, alleviates construction weight, saves material.
Cable stayed bridge is as a kind of guy system, and is bigger than the span ability of beam bridge, is the main bridge type of Longspan Bridge.Cable stayed bridge is made up of bridge tower, beam body, suspension cable, and wherein bridge tower, beam body be as the deck system pressurized, a kind of combined bridge structural system that suspension cable is drawn as supporting system.The bridge tower pattern has A type, inverted Y-shaped, Type B, only post, and material has steel and concrete.Suspension cable is furnished with Dan Suomian, parallel double rope face, oblique cord face etc.Cable stayed bridge primary structure system has: floating system, half floating system, tower beam consolidation system, firm structure system, T structure system, part earth anchor system, short tower section cable-stayed bridge system etc.The arrangement form of cable stayed bridge suspension cable mainly contains: radiation shape, harp shape, fan-shaped etc.
In CONSTRUCTION OF CABLE-STAYED BRIDGE, the inclined guy cable stretching method is many, and to stride symmetrical stretch-draw be main with major and minor, and during the adjustment stay cable force, major and minor also striding all need be adjusted.
Many at present first plans of carrying out stay cable force with " dead load equilibrium method "." dead load equilibrium method " main supposition comprises two aspects: the one, for main span, ignore the influence of beam body bending rigidity; The 2nd, stride for pair, ignore the bending rigidity of bridge tower.Therefore; The shortcoming of traditional inclined guy cable stretching mode is that suspension cable needs symmetrical stretch-draw; Be that main span suspension cable and pair are striden the suspension cable simultaneous tension, the cable stayed bridge shown in Fig. 1 mainly is made up of beam body 1, bridge tower (comprising king-tower 2 and lower king-post strut 4) and suspension cable 3, and a side of bridge tower is the main span side; The opposite side of bridge tower is that pair is striden side, and the stretching mode of suspension cable 3 is the suspension cable b1 that stretch-draw a1 simultaneous tension pair is striden side; The suspension cable a2 simultaneous tension pair of the side of stretch-draw main span is again striden the suspension cable b2 of side; The suspension cable a3 simultaneous tension pair of the side of stretch-draw main span is then striden the suspension cable b3 of side; By that analogy, the whole suspension cables of stretch-draw.Because the ram that suspension cable uses has error, therefore, to be bent with the rigidly connected king-tower 2 of lower king-post strut 4 (or beam body 1), beam body 1 horizontal force is uneven.
Summary of the invention
To above-mentioned prior art; The present invention provides a kind of method for stretching that cuts with scissors the pylon cable-stayed bridge suspension cable, is applicable to the major and minor cable stayed bridge of all arranging suspension cable of striding, to the suspension cable of bridge tower both sides; Only need the suspension cable of stretch-draw bridge tower one side; And the suspension cable of opposite side need not to carry out stretch-draw, has not only simplified the stretching process of suspension cable, has eliminated the defective that causes the bridge tower bending because of bridge tower both sides inclined cable force unbalance simultaneously.
In order to solve the problems of the technologies described above; The technical scheme that a kind of method for stretching that cuts with scissors the pylon cable-stayed bridge suspension cable of the present invention is achieved is: wherein cable stayed bridge comprises beam body, bridge tower and suspension cable; Said bridge tower constitutes by the king-tower that is positioned at beam body top with the rigidly connected lower king-post strut of said beam body, adopts hinged between said king-tower and the said lower king-post strut; The method for stretching of said suspension cable may further comprise the steps:
Step 1, construction bridges basis, said bridge foundation comprises pile foundation, cushion cap and pier stud, accomplishes the construction of accomplishing lower king-post strut when the beam body sets up;
The king-tower that step 2, construction and lower king-post strut are hinged, and accomplish the extension rope that is positioned at king-tower one skew back drag-line;
Step 3, completion are positioned at the extension rope and the stretch-draw of said king-tower opposite side suspension cable.
Say that further in above-mentioned steps one, the position of said lower king-post strut overlaps with the position of one of them pier stud of said bridge.
Also have, in step 2 and step 3, the order of hanging rope is to begin successively to plug-in rope from pin joint suspension cable the most nearby.
In addition, in step 3, comprise one of following two kinds of situations: after the suspension cable of this side is all hung rope successively, carry out the intact skew cables of stretch-draw or every extension more successively after, immediately this skew cables is carried out stretch-draw.In the inclined guy cable stretching process of step 3,, determine whether this suspension cable is carried out the Suo Li adjustment according to monitored results to stay cable force.
Compared with prior art, the invention has the beneficial effects as follows:
(1) reduces the stretch-draw number of times.Stretch-draw is positioned at the suspension cable of bridge tower one side, and the stretch-draw number of times is 50% of traditional tensioning process, has shortened the stretch-draw time greatly, saves the duration.
(2) reduce the stretch-draw error.Because the jack self that the stretch-draw suspension cable adopts has error; Therefore each stretch-draw of suspension cable all can produce error; And the suspension cable of stretch-draw bridge tower one side only; Can confirm the corresponding Suo Li of opposite side suspension cable through calculating, the coefficient of utilization of jack is 50% of traditional tensioning process, thereby has reduced the inclined guy cable stretching power error that causes owing to jack self error.
A kind of method for stretching that cuts with scissors the pylon cable-stayed bridge suspension cable of the present invention can be widely used in various major and minor constructions of striding the cable stayed bridge of all arranging suspension cable, not only can increase substantially the operating efficiency of inclined guy cable stretching, and has guaranteed the accuracy of construction.For providing enough technical supports, the construction of cable stayed bridge from now on ensures to have very important realistic meaning with theoretical.
Description of drawings
Fig. 1 is that a kind of bridge tower and beam body rigidly connect cable stayed bridge inclined guy cable stretching method sketch map in the prior art;
Fig. 2 is a kind of method for stretching sketch map that cuts with scissors the pylon cable-stayed bridge suspension cable of the present invention;
Fig. 3-1 is to Fig. 3-the 5th, and the present invention cuts with scissors the sketch map of the method for stretching embodiment of pylon cable-stayed bridge suspension cable;
Wherein: Fig. 3-the 1st, the sketch map behind the completing steps one,
Fig. 3-the 2nd, the sketch map of completing steps two,
Fig. 3-the 3rd accomplishes the sketch map after first suspension cable is hung cable stretching in the step 3,
Fig. 3-the 4th accomplishes the sketch map after whole suspension cables are hung rope and stretch-draw,
The sketch map of the cable stayed bridge that the method for stretching that Fig. 3-5 adopts the present invention to cut with scissors the pylon cable-stayed bridge suspension cable is accomplished;
The specific embodiment
Below in conjunction with the specific embodiment the present invention is done to describe in further detail.
As shown in Figure 2; A kind of method for stretching that cuts with scissors the pylon cable-stayed bridge suspension cable of the present invention; Wherein cable stayed bridge comprises beam body 1, bridge tower and suspension cable 3; Said bridge tower constitutes by the king-tower 2 that is positioned at beam body 1 top with said beam body 1 rigidly connected lower king-post strut 4, adopts hinged between said king-tower 2 and the said lower king-post strut 4; The principle of promptly just intending according to " dead load equilibrium method " stay cable force, when initial stay cable force was drafted, the method for stretching of said suspension cable 3 may further comprise the steps:
Step 1, construction bridges basis, said bridge foundation comprises pile foundation, cushion cap and pier stud, accomplishes the construction of accomplishing lower king-post strut 4 when beam body 1 sets up; The position of wherein said lower king-post strut 4 can overlap with the position of one of them pier stud of bridge.
The king-tower 2 that step 2, construction and lower king-post strut 4 are hinged, and accomplish the extension rope that is positioned at king-tower 2 one skew back drag-lines;
Step 3, completion are positioned at the extension rope and the stretch-draw of said king-tower 2 opposite side suspension cables.When the stretch-draw suspension cable, can be after the suspension cable of this side is all hung rope successively, to carry out stretch-draw more successively; After also can being the intact skew cables of every extension, immediately this skew cables is carried out stretch-draw.In addition, according to monitored results, determine whether this suspension cable is carried out the Suo Li adjustment to stay cable force.
For easy construction, the order that no matter is positioned at the suspension cable extension rope of which side of bridge tower (so it is all unrestricted still be to the main span side that pair is striden side) all can be to begin successively to plug-in rope from pin joint suspension cable the most nearby, but other order is all unrestricted.
According to the first principle of intending of " dead load equilibrium method " stay cable force; When initial stay cable force is drafted; The present invention reaches the purpose of the bending rigidity of ignoring tower through adopting hinge tower (adopting hinged between said king-tower 2 and the said lower king-post strut 4) mode, to eliminate the influence of bridge tower bending rigidity in the inclined guy cable stretching process.Characteristics of the present invention are: be positioned at the not stretch-draw of suspension cable of bridge tower one side, and can confirm this side stay cable force through numerical computations.After inclined guy cable stretching is accomplished, can the hinge of hinge tower is fixed, therefore, the method for stretching of suspension cable of the present invention both had been applicable to that the hinge pylon cable-stayed bridge also can be applicable to the inclined guy cable stretching of other structural system cable stayed bridge.
Below tell about detailed process of the present invention through embodiment, it is the convenience in order to understand that embodiment is provided, and never is restriction the present invention, such as, the sequential scheduling of the extension cable stretching of suspension cable.
Embodiment:
The research material brief introduction: shown in Fig. 3-5, adopt the cable stayed bridge form of hinge tower, bridge tower tilts 18 ° to the river course center position, and bridge tower and lower king-post strut are hinged, beam body and lower king-post strut are fixed, and main spanning directly is arranged as: the preceding pair of 45m strides+138m main span+2x30m after pair stride.The beam body adopts steel and concrete combined structure, and promptly main span adopts the steel box-beam structure, and pair is striden the employing PC Box Girder Structure.Main span skew back anchor-hold district is positioned at central authorities and cuts apart band, rope level interval 12m, and pair is striden staying cable anchorage zone and is positioned at the outside, sidewalk, rope level interval 3.75m.Pair is striden suspension cable, and to be arranged as on the beam body anchor point the highest on the near suspension cable anchor point of bridge tower and the tower corresponding, and the rest may be inferred.
Bridge tower is the hinge tower, total length 120m, and the position of lower king-post strut overlaps with the position of the main pier stud of bridge, is hinged between king-tower and the lower king-post strut (also being the main pier stud of bridge).Realize that hinged hinge is made up of two members up and down, wherein, upper member is connected with the bottom of king-tower, passes through the finish rolling deformed bar anchoring between the top of lower member and lower king-post strut (being a pier stud of bridge foundation).
The stretching process of the pairing hinge pylon cable-stayed bridge of above-mentioned research material suspension cable is following:
Step 1, construction bridges basis (pile foundation, cushion cap and pier stud); Accomplish the construction of accomplishing lower king-post strut when the beam body sets up, comprise support assembly unit girder steel, on full framing, build forward and backward secondary span concrete beam section simultaneously; Stretch-draw concrete beam section prestressing force; Accomplish main span steel case beam and stride being connected of prestressed concrete box girder with secondary, the beam body connects back dismounting pair and strides support, shown in Fig. 3-1;
Behind the hinged king-tower of step 2, construction and lower king-post strut; Installation back pair shown in Fig. 3-2 is striden the suspension cable of a side; Pair is striden the extension rope of a skew back drag-line after the A9 suspension cable is accomplished to the extension Suo Fangxiang shown in the A1 suspension cable successively, and king-tower is removed the king-tower support after reaching the precalculated position;
Step 3, accomplish the extension rope of main span one skew back drag-line successively; Shown in Fig. 3-3; Begin successively to plug-in rope (promptly according to B1, B2, B3, B4, B5, B6, B7, B8, B9 order) from pin joint suspension cable B1 the most nearby, whenever articulate this suspension cable of stretch-draw immediately behind the skew cables, remove the corresponding steel box beam bracket of this suspension cable after arriving design Suo Li; Until extension rope-stretch-draw of accomplishing the whole suspension cables of main span one side, shown in Fig. 3-4.The back pair is striden a side in this process all suspension cable A1, A2, A3, A4, A5, A6, A7, A8, A9 are all without stretch-draw.
In the inclined guy cable stretching process of step 3,, determine whether this suspension cable is carried out the Suo Li adjustment, that is: contrast actual measurement stay cable force numerical value and target Suo Li number adjustment main span side stay cable force according to monitored results to stay cable force.For example, in the present embodiment for the suspension cable of main span one side, mend in proper order according to the B9 shown in Fig. 3-4, B8, B7, B6, B5, B4, B3, B2, B1 and to draw the accent rope.
To sum up; According to above-mentioned steps the suspension cable of the cable stayed bridge that research material provided is carried out stretch-draw; Can save pair and stride skew back drag-line A1～A9 stretch-draw of totally nine pairs of 18 drag-lines; Greatly reduce the stay cable force error that is caused by stretch-draw, comparing traditional cable stayed bridge inclined guy cable stretching construction technology has significant advantage.
Although invention has been described for top combination figure; But the present invention is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Under 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 (5)
1. method for stretching that cuts with scissors the pylon cable-stayed bridge suspension cable; Wherein cable stayed bridge comprises beam body (1), bridge tower and suspension cable (3); Said bridge tower constitutes by the king-tower (2) that is positioned at beam body (1) top with the rigidly connected lower king-post strut of said beam body (4), adopts hinged between said king-tower (2) and the said lower king-post strut (4); It is characterized in that: the method for stretching of said suspension cable (3) may further comprise the steps:
Step 1, construction bridges basis, said bridge foundation comprises pile foundation, cushion cap and pier stud, accomplishes beam body (1) is accomplished lower king-post strut (4) when setting up construction;
The king-tower (2) that step 2, construction and lower king-post strut (4) are hinged, and accomplish the extension rope that is positioned at king-tower (2) one skew back drag-lines;
Step 3, completion are positioned at the extension rope and the stretch-draw of said king-tower (2) opposite side suspension cable.
2. the method for stretching of hinge pylon cable-stayed bridge suspension cable according to claim 1 is characterized in that: in step 1, the position of said lower king-post strut (4) overlaps with the position of one of them pier stud of bridge.
3. the method for stretching of hinge pylon cable-stayed bridge suspension cable according to claim 1 is characterized in that: in step 2 and step 3, the order of hanging rope is to begin successively to plug-in rope from pin joint suspension cable the most nearby.
4. the method for stretching of hinge pylon cable-stayed bridge suspension cable according to claim 1 is characterized in that: in step 3, comprise one of following two kinds of situations:
(1) suspension cable of this side is all hung rope successively after, carry out stretch-draw more successively;
(2) behind the intact skew cables of every extension, immediately this skew cables is carried out stretch-draw.
5. the method for stretching of hinge pylon cable-stayed bridge suspension cable according to claim 1 is characterized in that: in the inclined guy cable stretching process of step 3, according to the monitored results to stay cable force, determine whether this suspension cable is carried out the Suo Li adjustment.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102839605A (en) * | 2012-09-25 | 2012-12-26 | 长沙理工大学 | Sag control method for small-sag datum strand |
| CN105155426A (en) * | 2015-09-30 | 2015-12-16 | 中铁港航局集团有限公司 | Method for combining cable-stayed bridge deck cable unreeling manner and air cable unreeling manner under condition of limited space |
| CN105401523A (en) * | 2015-09-30 | 2016-03-16 | 中铁港航局集团有限公司 | Hanging mounting method of long heavy stay cable under space limited condition |
| CN107201721A (en) * | 2016-03-16 | 2017-09-26 | 中铁十五局集团有限公司 | Stay cable installation construction method |
| CN110184930A (en) * | 2019-05-27 | 2019-08-30 | 法尔胜泓昇集团有限公司 | The stayed Cable Construction method of low-pylon cable-stayed bridge |
| CN111560831A (en) * | 2020-04-21 | 2020-08-21 | 中铁武汉勘察设计研究院有限公司 | Continuous bridge without fixed support |
| CN113737649A (en) * | 2021-08-19 | 2021-12-03 | 中铁十六局集团第五工程有限公司 | Bridge suspension cable tensioning device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105401523A (en) * | 2015-09-30 | 2016-03-16 | 中铁港航局集团有限公司 | Hanging mounting method of long heavy stay cable under space limited condition |
| CN107201721A (en) * | 2016-03-16 | 2017-09-26 | 中铁十五局集团有限公司 | Stay cable installation construction method |
| CN110184930A (en) * | 2019-05-27 | 2019-08-30 | 法尔胜泓昇集团有限公司 | The stayed Cable Construction method of low-pylon cable-stayed bridge |
| CN111560831A (en) * | 2020-04-21 | 2020-08-21 | 中铁武汉勘察设计研究院有限公司 | Continuous bridge without fixed support |
| CN113737649A (en) * | 2021-08-19 | 2021-12-03 | 中铁十六局集团第五工程有限公司 | Bridge suspension cable tensioning device |
| CN113737649B (en) * | 2021-08-19 | 2023-03-14 | 中铁十六局集团第五工程有限公司 | Bridge suspension cable tensioning device |
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Address after: 300051 No. 239, Yingkou Road, Heping District, Tianjin Patentee after: Tianjin municipal engineering design and Research Institute Co.,Ltd. Address before: 300051 No. 239, Yingkou Road, Heping District, Tianjin Patentee before: TIANJIN MUNICIPAL ENGINEERING DESIGN & Research Institute |