CN103993660A - Double-jack-stay inwards-concave rope arch structure - Google Patents
Double-jack-stay inwards-concave rope arch structure Download PDFInfo
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- CN103993660A CN103993660A CN201410110542.4A CN201410110542A CN103993660A CN 103993660 A CN103993660 A CN 103993660A CN 201410110542 A CN201410110542 A CN 201410110542A CN 103993660 A CN103993660 A CN 103993660A
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Abstract
The invention discloses a double-jack-stay inwards-concave rope arch structure. The double-jack-stay inwards-concave rope arch structure comprises an upper chord beam, a lower chord stay cable and jack stays, wherein the lower chord stay cable is composed of multiple sets of short stay cable bodies, the short stay cable bodies and the upper chord beam are located in the same plane, each set of short stay cable bodies includes two stay cable bodies, the lower ends of every two corresponding cable bodies are connected to form the shape of V, and the upper ends of every two corresponding cable bodies are hinged to the upper chord beam; two jack stays are upwards arranged between the connecting points between the lower ends of every two corresponding stay cable bodies and the upper chord beam, and arranged on the two sides of the angular bisector of the two corresponding stay cable bodies symmetrically, and the rear stay cable body in a previous set of short stay cable bodies and the front stay cable body in a later set of short stay cable bodies are arranged in a crossed mode. According to the double-jack-stay inwards-concave rope arch structure, a traditional long stay cable is omitted, the multiple stay cable bodies are used instead, after one stay cable body loses efficacy, the whole structure cannot immediately lose efficacy due to the connection relation between other stay cable bodies and the upper chord beam and the connection relation between the stay cable bodies and the jack stays, the anti-collapse performance is improved, continuous collapse can be prevented, and the potential safety hazards are eliminated.
Description
Technical field
The present invention relates to a kind of rope arch structure, particularly a kind of pull-off pole concave rope arch structure.
Background technology
The application of field of civil engineering large-span steel is more and more at present.But along with span increases deadweight, sharply strengthen, structure faces the contradiction of using function, design rationality and economic indicator mutually to restrict.In order to meet the use function of structure, reduce the rigidity that dead load is improved structure, the prestressing force beam string structure of being furnished with drag-line is more and more applied in large-span steel simultaneously.By the layout of prestressed cable and strut, the bearing capacity of large-span steel and rigidity have had very large improvement.
As shown in Figure 1, existing string beam, comprises wind up beam 1(or arch or the truss that are positioned at same plane to existing rope arch structure), strut 3 and lower edge drag-line 2, described in the wind up two ends of beam 1 be fixedly connected with the two ends of lower edge drag-line 2 respectively; Described strut 3 vertically arranges, its upper end is hinged with the beam 1 that winds up, and lower end is fixedly connected with lower edge drag-line 2 by cord clip tool 4; Lower edge drag-line 2 after stretch-draw forms the broken line of axial symmery shape, and the beam 1 that winds up, strut 3 and lower edge drag-line 2 form self equilibrium systems, lower edge drag-line 2 tensions, and strut 3 is pressurized two power bars, the beam 1 that winds up is for bending component.
In said structure, the prestressing force of lower edge drag-line 2 makes structure generation allowance for camber, therefore the final amount of deflection of structure under load action can reduce, and by the stretching force of lower edge drag-line 2, make strut 3 produce component upwards, the beam 1 that causes winding up produces and internal force and distortion contrary under external load effect, to form whole tension string beam structure and to improve the rigidity of structure, 3 pairs of Moment resistant Elements of strut provide resiliency supported, improve the latter's stress performance; When if bending component is taken as arch, by lower edge drag-line 2, born the horizontal thrust of arch, alleviate the burden that arch produces bearing, therefore should take necessary temporary transient or permanent construction measure at bearing place, under top stress and external load effect, (refer under the roofing load actions such as deadweight) form self equilibrium systems, do not produce horizontal thrust; Meanwhile, the existence of lower edge drag-line 2 can reduce greatly the to wind up cross section of beam 1, improves the supporting capacity of total.At this moment, if in use there is destroying fracture in lower edge drag-line 2, can not provide horizontal pull for arch stand, bearing may move to both sides, and after lower edge drag-line 2 lost efficacy, near the effect of the strut 3 its breakaway poing was lost efficacy, and only depending on the beam 1 that winds up to bear external load may be because Lack of support ruptures, and whole string beam also can lose efficacy thereupon.
As shown in Figure 2, get any one and depart from the strut 3 of angular bisector at its broken line angle, place and the tie point of drag-line 2 as standing balance research object, tie point is subject to the effect of the left and right end pulling force P1 of drag-line 2 and the support force P3 of P2 and 3 pairs of tie points of strut, according to parallelogram law, form balanced system of force, due to αHe angle, angle, β is unequal, therefore according to geometric knowledge, can know that P1 is not equal to P2, therefore frictional force F=P1-P2 ≠ 0 with 4 pairs of drag-lines 2 of tie point place cord clip tool of drag-line 2 at strut 3.Obviously, if drag-line 2 keeps balance at cord clip tool 4 places, the frictional force F of 4 pairs of drag-lines 2 of cord clip tool is necessary; On the contrary, if cord clip tool 4 can not provide enough frictional force to drag-line 2, it is relatively static that drag-line 2 just can not keep with it, strut 3 just can not keep balance in other words, will slide to the little direction of drag-line 2 pulling force, cause drag-line 2 lax, until the pulling force difference of the drag-line 2 of cord clip tool 4 both sides equates with the frictional force that cord clip tool 4 offers drag-line 2.
Due to generally, there is one or more layers PE overcoat in drag-line 2 surfaces, this overcoat is chemically unstables with respect to steel, therefore even if the frictional force of 2 of cord clip tool 4 and drag-lines is enough large during construction, also be merely able to make within a certain period of time strut 3 to keep vertically, even if done even at that time frictional force test, reach requirement, chemical instability due to PE, can there is very soon chemical change (as chemical breakdown, aging), thereby there is drag-line, at strut 3, cause drag-line 2 to become slack with the tie point place slippage of drag-line 2, and then produce structural safety hidden danger.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of reasonable in design, in use can avoid occurring that whole string beam directly lost efficacy or occurred the pull-off pole concave rope arch structure of drag-line relaxation.
Technical problem to be solved by this invention is to realize by following technical scheme, a kind of pull-off pole concave rope arch structure, comprise the beam that winds up, be located at the lower edge drag-line of the beam below of winding up and be located at some struts that wind up between beam and lower edge drag-line, be characterized in: described lower edge drag-line is comprised of some groups short drag-lines, short drag-line with wind up beam in same plane, every group of short drag-line comprises two skew cables, the lower end of two skew cables links together, V-shaped setting, and the upper end of two skew cables is hinged with the beam that winds up; At the tie point of two skew cables lower ends upwards and wind up and between beam, be provided with two struts, two struts are symmetricly set on the angular bisector both sides of the suspension cable of two V-shaped settings, the upper end of described strut is hinged with the beam that winds up, and the lower end of strut joins by the tie point of cord clip tool and two skew cables lower ends; A rear skew cables of described preceding one group of short drag-line with after the last skew cables of one group of short drag-line arranged in a crossed manner.
Technical problem to be solved by this invention can also further realize by following technical scheme, and described pull-off pole concave rope arch structure is characterized in: two described skew cables are set to one, cord clip tool is located at V-type break place.
Technical problem to be solved by this invention can also further realize by following technical scheme, described pull-off pole concave rope arch structure, be characterized in: described cord clip tool comprises upper and lower two clamping plates, between upper and lower two clamping plates, be provided with set bolt, at the middle part of train wheel bridge, be provided with the engaging lug coordinating with strut.
Technical problem to be solved by this invention can also further realize by following technical scheme, described pull-off pole concave rope arch structure, be characterized in: described cord clip tool comprises the junction plate being located between two skew cables, the two ends of junction plate are respectively equipped with the connecting hole coordinating with suspension cable, are provided with the engaging lug coordinating with strut at the middle part of junction plate.
Technical problem to be solved by this invention can also further realize by following technical scheme, described pull-off pole concave rope arch structure, is characterized in: the upper end of a rear skew cables of described preceding one group of short drag-line is simultaneously hinged with the beam that winds up with the upper end at last strut at rear one group of short drag-line; The upper end of a rear strut of preceding one group of short drag-line is simultaneously hinged with the beam that winds up with the upper end at last skew cables at rear one group of short drag-line.
Technical problem to be solved by this invention can also further realize by following technical scheme, described pull-off pole concave rope arch structure, is characterized in: two described struts are divided into trisection by the angle forming described in the suspension cable of two V-shaped settings.
Compared with prior art, the long drag-line that the present invention opens string beam by tradition removes, replacing some skew cables forms, after a certain skew cables lost efficacy, due to all the other suspension cables and the annexation of winding up between beam and strut, total can not lost efficacy at once, improved the anti-fall performance of collapsing, can prevent Progressive Collapse, eliminate potential safety hazard.Simultaneously, suspension cable is at the both sides internal force balance at the tie point place of strut and suspension cable, make not exist between cord clip tool and suspension cable frictional force, thereby can there is not relative sliding between cord clip tool and suspension cable, therefore can avoid short drag-line lax, eliminate safe hidden trouble, in addition, arranging of pull-off pole can increase the span that the beam rope arch structure that winds up can reach.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art;
Fig. 2 is the force analysis figure of arbitrary strut and suspension cable tie point in Fig. 1;
Fig. 3 is a kind of structural representation of the present invention;
Fig. 4 is the force analysis figure of arbitrary strut and suspension cable tie point in Fig. 3;
Fig. 5 is a kind of structural representation of cord clip tool;
Fig. 6 is the another kind of structural representation of cord clip tool.
The specific embodiment
With reference to figure 3, a kind of pull-off pole concave rope arch structure, comprise the beam 5 that winds up, be located at the lower edge drag-line of beam 5 belows of winding up and be located at the some struts 6 that wind up between beam 5 and lower edge drag-line, the beam 5 that winds up can also be arch or truss, described lower edge drag-line is comprised of some groups short drag-lines, short drag-line with wind up beam in same plane, every group short drag-line comprises two skew cables 7, the lower end of two skew cables 7 links together, V-shaped setting, and the upper end of two skew cables 7 is hinged with the beam 5 that winds up; At the tie point of two skew cables 7 lower ends upwards and wind up and between beam 5, be provided with two struts 6, two struts 6 are symmetricly set on the angular bisector both sides of the suspension cable 7 of two V-shaped settings, preferably: two described struts 6 are divided into trisection by the angle forming described in the suspension cable of two V-shaped settings 7.The upper end of described strut 6 is hinged with the beam 5 that winds up, and the lower end of strut 6 joins by the tie point of cord clip tool 8 and two skew cables 7 lower ends; A rear skew cables 7 of described preceding one group of short drag-line with after the last skew cables 7 of one group of short drag-line arranged in a crossed manner.
Two described skew cables 7 are set to one, and cord clip tool 8 is located at V-type break place.As shown in Figure 5, now the structure of cord clip tool 8 is: comprise upper and lower two clamping plates 9,10, between upper and lower two clamping plates 9,10, be provided with set bolt, be provided with the engaging lug 11 coordinating with strut 6 at the middle part of train wheel bridge 9.During installation, by suspension cable 7 folders therebetween, then with set bolt, upper and lower two clamping plates 9,10 is fixing tight, the bottom of two struts 6 is fixed by bolts on the engaging lug 11 of cord clip tool 8 upper and lower two clamping plates 9,10.
When V-structure that short drag-line is comprised of two skew cables 7, as shown in Figure 6, now the structure of cord clip tool 8 is: comprise the junction plate 12 being located between two skew cables 7, the two ends of junction plate 12 are respectively equipped with the connecting hole coordinating with suspension cable 7, are provided with the engaging lug 13 coordinating with strut 6 at the middle part of junction plate 12.During installation, two bottoms of two skew cables 7 are bolted on respectively in the connecting hole at junction plate 12 two ends, and the bottom of two struts 6 is fixed by bolts on the engaging lug 13 of cord clip tool 8, installs.
Wind up beam 5 for bending component, and the beam 5 that winds up, strut 6 and suspension cable 7 form self equilibrium systems, suspension cable 7 tensions, and strut 6 is pressurized two power bars.
As shown in Figure 4, two skew cables 7 of getting arbitrary group of short drag-line with the tie point of the strut 6 being connected as standing balance research object, tie point is subject to pulling force P1 and P2 and the support force P3 of 6 pairs of tie points of strut and the effect of P4 of left and right end suspension cable 7, according to parallelogram law, form balanced system of force, because angle α 1 is equal with angle α 2, angle β 1 and angle β 2 equate, therefore can know P3=P4, P1=P2, the internal force that is suspension cable 7 is a definite value substantially in its length, suspension cable 7 is the both sides internal force balance with the tie point place of suspension cable 7 at strut 6, strut 6 is not relied on and the frictional force of 7 of suspension cables and nature in balance between two forces state, strut 6 can not slide with respect to suspension cable 7, thereby avoid short drag-line lax.
The suspension cable 7 of described every group of short drag-line can directly be hinged on and wind up on beam 5, can be also following structure: the upper end of a rear skew cables 7 of described preceding one group of short drag-line is simultaneously hinged with the beam 5 that winds up with the upper end at last strut 6 at rear one group of short drag-line; The upper end of a rear strut 6 of preceding one group of short drag-line is simultaneously hinged with the beam 5 that winds up with the upper end at last skew cables 7 at rear one group of short drag-line, can increase like this intensity of whole rope arch.
Implementation procedure: the position of first determining each group strut 6 on the beam 5 that winds up, and the end of each group strut 6 is round on concentrically ringed circular arc with the arch place of winding up, after the location positioning of the end on circular arc, suspension cable 7 is pulled in to strut 6 ends and winds up on beam 5 on definite position.When each suspension cable 7 and strut 6 are installed, cord clip tool 8 is firmly fixed in the corresponding calibration position of each suspension cable 7.After applying by the work progresss such as stretch-draw, installation and various load, strut 6 is just in each suspension cable 7 state (position of all members is all identical with each member position of the string beam under prior art) that design is expected.On the basis of this processing mode, adopt an effective measure and increase the friction factor of 8 of each suspension cable 7 and cord clip tools as far as possible, as safety stock, so that each the short drag-line in a string beam is all the time in stable state.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a pull-off pole concave rope arch structure, comprise the beam that winds up, be located at the lower edge drag-line of the beam below of winding up and be located at some struts that wind up between beam and lower edge drag-line, it is characterized in that: described lower edge drag-line is comprised of some groups short drag-lines, short drag-line with wind up beam in same plane, every group of short drag-line comprises two skew cables, the lower end of two skew cables links together, V-shaped setting, and the upper end of two skew cables is hinged with the beam that winds up; At the tie point of two skew cables lower ends upwards and wind up and between beam, be provided with two struts, two struts are symmetricly set on the angular bisector both sides of the suspension cable of two V-shaped settings, the upper end of described strut is hinged with the beam that winds up, and the lower end of strut joins by the tie point of cord clip tool and two skew cables lower ends; A rear skew cables of described preceding one group of short drag-line with after the last skew cables of one group of short drag-line arranged in a crossed manner.
2. pull-off pole concave rope arch structure according to claim 1, is characterized in that: two described skew cables are set to one, and cord clip tool is located at V-type break place.
3. pull-off pole concave rope arch structure according to claim 2, is characterized in that: described cord clip tool comprises upper and lower two clamping plates, between upper and lower two clamping plates, is provided with set bolt, is provided with the engaging lug coordinating with strut at the middle part of train wheel bridge.
4. pull-off pole concave rope arch structure according to claim 1, it is characterized in that: described cord clip tool comprises the junction plate being located between two skew cables, the two ends of junction plate are respectively equipped with the connecting hole coordinating with suspension cable, are provided with the engaging lug coordinating with strut at the middle part of junction plate.
5. pull-off pole concave rope arch structure according to claim 1, is characterized in that: the upper end of a rear skew cables of described preceding one group of short drag-line is simultaneously hinged with the beam that winds up with the upper end at last strut at rear one group of short drag-line; The upper end of a rear strut of preceding one group of short drag-line is simultaneously hinged with the beam that winds up with the upper end at last skew cables at rear one group of short drag-line.
6. pull-off pole concave rope arch structure according to claim 1, is characterized in that: two described struts are divided into trisection by the angle forming described in the suspension cable of two V-shaped settings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410110542.4A CN103993660A (en) | 2014-03-24 | 2014-03-24 | Double-jack-stay inwards-concave rope arch structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410110542.4A CN103993660A (en) | 2014-03-24 | 2014-03-24 | Double-jack-stay inwards-concave rope arch structure |
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| CN103993660A true CN103993660A (en) | 2014-08-20 |
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| CN201410110542.4A Pending CN103993660A (en) | 2014-03-24 | 2014-03-24 | Double-jack-stay inwards-concave rope arch structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106149544A (en) * | 2016-07-25 | 2016-11-23 | 上海市政工程设计研究总院（集团）有限公司 | A kind of jump stay bracket system |
| CN106978849A (en) * | 2017-05-27 | 2017-07-25 | 山东建筑大学 | A kind of cable arch structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106149544A (en) * | 2016-07-25 | 2016-11-23 | 上海市政工程设计研究总院（集团）有限公司 | A kind of jump stay bracket system |
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| CN106978849A (en) * | 2017-05-27 | 2017-07-25 | 山东建筑大学 | A kind of cable arch structure |
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Application publication date: 20140820 |