CN111794076A - Suspension bridge structure for controlling vibration by reversely and symmetrically suspending under beam - Google Patents
Suspension bridge structure for controlling vibration by reversely and symmetrically suspending under beam Download PDFInfo
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- CN111794076A CN111794076A CN202010584837.0A CN202010584837A CN111794076A CN 111794076 A CN111794076 A CN 111794076A CN 202010584837 A CN202010584837 A CN 202010584837A CN 111794076 A CN111794076 A CN 111794076A
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- 239000000725 suspension Substances 0.000 title claims abstract description 90
- 230000035939 shock Effects 0.000 claims description 8
- 238000010276 construction Methods 0.000 description 7
- 238000004873 anchoring Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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Abstract
The invention relates to a suspension bridge structure for controlling vibration by reversely and symmetrically suspending under a beam, which comprises a beam body and a bridge tower, wherein a main cable is arranged above the beam body, the main cable is connected with the beam body through a suspension rod, the main cable is anchored on the ground at two sides of a bridge span after passing through a cable saddle at the top end of the bridge tower, two lower suspension cables are arranged below two transverse sides of the beam body, and the lower suspension cables are connected with the beam body through lower pull rods. The invention can effectively control the amplitude of the large-span beam body, and effectively reduce the amplitude of the beam body after the amplitude of the large-span beam body is controlled by the downward reverse suspension system, so that the smoothness and the driving safety of the bridge can be ensured, and the invention has obvious advantages in the use of future large-span suspension bridges, cable-stayed bridges and large-span structures.
Description
Technical Field
The invention relates to the technical field of bridge structure buildings, in particular to a suspension bridge structure with reverse symmetrical suspension pulling and vibration control under a beam.
Background
The span of the suspension bridge is the largest bridge at present, and the span of other bridge types such as an arch bridge, a cable-stayed bridge and the like is far smaller than that of the suspension bridge. The suspension bridge has a light structure, is a very good bridge technology, is limited by the structural characteristics of the suspension bridge, has a large bridge span, is mainly stressed by suspension cables, is a flexible system, can reach the mid-span amplitude of dozens of centimeters when being subjected to wind load, and has adverse effects on the driving safety due to the overlarge amplitude.
In China, high-speed rails are rapidly developed in recent years, the running speed of the high-speed rails is high, and the requirement on the smoothness of the rails is high. When a particularly large bridge span is needed, especially when other bridge types such as an arch bridge, a cable-stayed bridge and the like cannot meet the requirements, only a suspension bridge can be selected. The span-middle amplitude of the suspension bridge is large and exceeds the smoothness allowable value of the high-speed rail line, and the use requirement cannot be met. Even if a suspension bridge is selected, the bridge span is greatly reduced, so that the bridge span advantage of the suspension bridge is limited. Limited by the current bridge span technical conditions, when high-speed rails are selected, large canyon terrains must be avoided, the length of the lines is increased, the advantages of the high-speed rails are reduced, and the construction cost is increased.
At present, the existing suspension bridge needs to be modified, the wide-amplitude vibration in the span is limited to narrow-amplitude vibration so as to adapt to the new large-span condition use requirement, and technical support is provided for better development of high-speed rails in China.
Disclosure of Invention
The invention aims to provide a suspension bridge structure for controlling vibration by reversely and symmetrically suspending and pulling under a beam, which is used for controlling the amplitude of a beam body of a long-span bridge so as to ensure the smoothness of the beam body and achieve the aim of driving safety.
The technical scheme adopted by the invention is as follows:
reverse symmetry under roof beam hangs and draws suspension bridge structure of accuse shake, including the roof beam body and bridge tower, roof beam body top is provided with the main push-towing rope, is connected through the jib between main push-towing rope and the roof beam body, and the anchor is subaerial in the bridge both sides after the cable saddle on bridge tower top in the main push-towing rope, its characterized in that:
two lower suspension cables are arranged below the two transverse sides of the beam body and are connected with the beam body through lower pull rods.
Two ends of the lower suspension cable are anchored on the ground at two sides of the bridge span.
The lower suspension cables are symmetrically arranged at two transverse sides of the beam body.
The lower suspension cable is arc-shaped in the horizontal plane outside the beam body, and the horizontal distance between the lower suspension cable and the beam body is gradually increased from the middle part to two sides.
The lower suspension cable is arc-shaped in a vertical plane outside the beam body, and the vertical distance between the lower suspension cable and the beam body is gradually increased from the middle part to two sides.
The lower rods between the lower suspension cables and the beam body are obliquely arranged and are positioned in a transverse plane.
The length of the pull rod is gradually increased from the middle part to the two sides.
The distance between the adjacent lower pull rods is gradually increased from the middle part to the two sides.
The invention has the following advantages:
(1) mature technology
The whole load is light, a lower suspension cable system newly added below the beam is similar to the existing suspension bridge, and the whole mechanical model and the construction technology are mature.
(2) Can effectively control the over-center vertical amplitude of the beam
The span of the suspension bridge is large, and the vertical amplitude of the midspan beam part is large. As shown in fig. 4, when the midspan beam vibrates upwards, the vibration is only received by the gravity of the beam downwards, and the flexibility of the beam is large, so that the vibration amplitude is too large when the bridge vibrates upwards. When the lower suspension cable system is added, as shown in fig. 5, the beam body cannot vibrate upwards to a large extent due to the drag of the lower suspension cable, and the amplitude of the beam body is controlled within a certain limit, so that the beam body can meet the high-standard use requirement.
(3) Can effectively control the horizontal amplitude of the beam span
Two sides of the lower suspension cable are outward, two arcs with outward openings are close to each other back to back, a pair of symmetrical reverse tension forces are formed, the beam body is pulled outwards, and when the beam body vibrates left and right, the horizontal vibration amplitude of the beam body can be effectively reduced due to the limitation of the reverse tension forces, so that the purposes of reducing the deformation of the beam body and reducing the amplitude are achieved.
(4) Small engineering quantity and good economical efficiency
Generally, in order to limit the amplitude of a beam, the rigidity of the beam is increased, and the rigidity of the beam is increased, namely the height of the beam is increased, so that the beam is heavy, an original suspension cable system needs to be increased, the whole engineering quantity is increased, and the manufacturing cost is increased.
The invention adds a set of suspension system which is downward in the reverse direction at the bottom of the beam under the condition of keeping the existing suspension bridge unchanged basically, and the whole project and the cost are increased less.
(5) Can effectively increase the span of the bridge
The existing suspension bridge is controlled by the maximum tension of a suspension cable and is influenced by the span-middle shock amplitude of a beam body, and the span re-increasing capacity of the existing suspension bridge is limited. After a set of additional reverse downward suspension system, the amplitude of the middle part of the beam body is effectively controlled, the beam body rigidity can be reduced, and the beam body height is reduced, so that the beam body weight is reduced, and the beam body with a larger span can be borne under the condition that the upper suspension cables are not changed. Thereby achieving the purpose of increasing the span of the bridge again.
(6) Obviously controls the position with larger amplitude
When the beam body vibrates, the amplitude of the beam cross center is large, and the amplitudes of the beam ends on the two sides are gradually reduced. The pull rods of the lower suspension cable are densely arranged at the midspan position of the beam body and sparsely arranged at the position close to the beam end, so that the position of the lower suspension cable is more obviously limited at the position with larger vibration, the pull rods at the beam end positions on two sides are reduced, the target is clear, and the effect is outstanding.
Drawings
Fig. 1 is an elevation view of a conventional suspension bridge.
Fig. 2 is an elevation view of the present invention.
Fig. 3 is a plan view of the present invention.
Fig. 4 is a cross-sectional diagram of a conventional suspension bridge body.
Figure 5 is a cross-sectional force diagram of the beam of the present invention.
The labels in the figure are: 1-lower suspension cable anchoring point, 2-beam body, 3-lower pull rod, 4-lower suspension cable, 5-upward pulling force, 6-downward and outward pulling force, 7-main cable anchoring point, 8-cable saddle, 9-bridge tower, 10-suspender and 11-main cable.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The structure of current suspension bridge includes the roof beam body 2 and bridge tower 9, and 2 tops of the roof beam body are provided with main push-towing rope 11, are connected through jib 10 between main push-towing rope 11 and the roof beam body 2, and main push-towing rope 11 is anchored on the subaerial of bridge span both sides behind the cable saddle 8 on bridge tower 9 top.
The invention relates to a suspension bridge structure for controlling vibration by reversely and symmetrically suspending under a beam, which is characterized in that a suspension structure under the beam is added on the basis of the existing suspension bridge, and after a set of suspension system is reversely and symmetrically added under the beam, the displacement in all directions of the beam can be controlled, so that the purposes of reducing the amplitude and controlling the vibration are achieved. The method specifically comprises the following steps: two lower suspension cables 4 are arranged below the two transverse sides of the beam body 2, and the lower suspension cables 4 are connected with the beam body 2 through lower pull rods 3. Two ends of the lower suspension cable 4 are anchored on the ground at two sides of the bridge span. The lower suspension cables 4 are symmetrically arranged at two transverse sides of the beam body 2.
The lower suspension cable 4 is arc-shaped in the horizontal plane outside the beam body 2, and the horizontal distance between the lower suspension cable 4 and the beam body 2 is gradually increased from the middle part to two sides. The lower suspension cable 4 is also arc-shaped in the vertical plane outside the beam body 2, and the vertical distance between the lower suspension cable 4 and the beam body 2 is gradually increased from the middle part to two sides. The middle part of the lower suspension cable 4 is close to the beam body 2, and is far away from the beam body 2 when being close to the beam end, and the whole body is two arc-shaped parts with outward openings and is pressed close back to back.
The lower suspension cables 4 and the lower pull rods 3 between the beam bodies 2 are obliquely arranged and are positioned in a transverse plane. The length of the lower pull rod 3 is gradually increased from the middle part to the two sides. The distance between the adjacent lower pull rods 3 is gradually increased from the middle part to the two sides, the arrangement is dense at the midspan part, and the arrangement is sparse when the lower pull rods are close to the beam ends.
The construction steps of the invention are as follows:
the construction method comprises the following steps of firstly constructing the suspension bridge, wherein the construction of the suspension bridge is unchanged from the existing construction scheme and technology. But when the construction of the suspension bridge beam part, the anchorage device of the pre-buried downward pull rod 3 is added. Constructing the anchoring points of the lower suspension cables 4 on the ground at two sides, installing the lower suspension cables 4 and the lower pull rods 3, tensioning the lower suspension cables 4, adjusting the lower pull rods 3 until the calculation requirement is met, achieving the system balance, and anchoring the lower pull rods 3 and the beam body anchorage devices.
The invention can effectively control the amplitude of the large-span beam body, and effectively reduce the amplitude of the beam body after the amplitude of the large-span beam body is controlled by the downward reverse suspension system, so that the smoothness and the driving safety of the bridge are ensured. The method has obvious advantages in the use of future large-span suspension bridges, cable-stayed bridges and large-span structures.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (8)
1. Reverse symmetry under roof beam hangs and draws suspension bridge structure of accuse shake, including the roof beam body (2) and bridge tower (9), the roof beam body (2) top is provided with main push-towing rope (11), is connected through jib (10) between main push-towing rope (11) and the roof beam body (2), and anchor in the subaerial of bridge span both sides after cable saddle (8) on bridge tower (9) top main push-towing rope (11), its characterized in that:
two lower suspension cables (4) are arranged below the two transverse sides of the beam body (2), and the lower suspension cables (4) are connected with the beam body (2) through lower pull rods (3).
2. The under-beam inverted-symmetric suspension-pulling shock-controlled suspension bridge structure according to claim 1, characterized in that:
two ends of the lower suspension cable (4) are anchored on the ground at two sides of the bridge span.
3. The under-beam inverted-symmetric suspension-pulling shock-controlled suspension bridge structure according to claim 2, characterized in that:
the lower suspension cables (4) are symmetrically arranged at two transverse sides of the beam body (2).
4. The under-beam reverse symmetric suspension-pulling shock-controlled suspension bridge structure according to claim 3, characterized in that:
the lower suspension cable (4) is arc-shaped in the horizontal plane at the outer side of the beam body (2), and the horizontal distance between the lower suspension cable (4) and the beam body (2) is gradually increased from the middle part to the two sides.
5. The under-beam reverse symmetric suspension-pulling shock-controlled suspension bridge structure according to claim 4, characterized in that:
the lower suspension cable (4) is arc-shaped in the vertical plane at the outer side of the beam body (2), and the vertical distance between the lower suspension cable (4) and the beam body (2) is gradually increased from the middle part to two sides.
6. The under-beam reverse symmetric suspension-pulling shock-controlled suspension bridge structure according to claim 5, characterized in that:
the lower pull rod (3) between the lower suspension cable (4) and the beam body (2) is obliquely arranged and is positioned in a transverse plane.
7. The under-beam reverse symmetric suspension-pulling shock-controlled suspension bridge structure according to claim 6, characterized in that:
the length of the lower pull rod (3) is gradually increased from the middle part to the two sides.
8. The under-beam inverted-symmetric suspension-pulling shock-controlled suspension bridge structure according to claim 7, characterized in that:
the distance between the adjacent lower pull rods (3) is gradually increased from the middle part to the two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010584837.0A CN111794076A (en) | 2020-06-24 | 2020-06-24 | Suspension bridge structure for controlling vibration by reversely and symmetrically suspending under beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010584837.0A CN111794076A (en) | 2020-06-24 | 2020-06-24 | Suspension bridge structure for controlling vibration by reversely and symmetrically suspending under beam |
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| Publication Number | Publication Date |
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| CN111794076A true CN111794076A (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010584837.0A Pending CN111794076A (en) | 2020-06-24 | 2020-06-24 | Suspension bridge structure for controlling vibration by reversely and symmetrically suspending under beam |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991008344A1 (en) * | 1989-11-29 | 1991-06-13 | Torodd Eeg Olsen | Method for building suspension bridges |
| CN101260646A (en) * | 2008-04-14 | 2008-09-10 | 李有为 | Great span bridge lower damper system for wind and water resistance |
| WO2017129936A1 (en) * | 2016-01-29 | 2017-08-03 | John Michael Corney | Long span suspension bridges - deck geometry |
| CN212505805U (en) * | 2020-06-24 | 2021-02-09 | 中铁第一勘察设计院集团有限公司 | Suspension bridge structure for controlling vibration by reversely and symmetrically suspending under beam |
-
2020
- 2020-06-24 CN CN202010584837.0A patent/CN111794076A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991008344A1 (en) * | 1989-11-29 | 1991-06-13 | Torodd Eeg Olsen | Method for building suspension bridges |
| CN101260646A (en) * | 2008-04-14 | 2008-09-10 | 李有为 | Great span bridge lower damper system for wind and water resistance |
| WO2017129936A1 (en) * | 2016-01-29 | 2017-08-03 | John Michael Corney | Long span suspension bridges - deck geometry |
| CN212505805U (en) * | 2020-06-24 | 2021-02-09 | 中铁第一勘察设计院集团有限公司 | Suspension bridge structure for controlling vibration by reversely and symmetrically suspending under beam |
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