CN113005880A - Pulley-heave block device for inhibiting large-span bridge from fluttering - Google Patents
Pulley-heave block device for inhibiting large-span bridge from fluttering Download PDFInfo
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- CN113005880A CN113005880A CN202110249264.0A CN202110249264A CN113005880A CN 113005880 A CN113005880 A CN 113005880A CN 202110249264 A CN202110249264 A CN 202110249264A CN 113005880 A CN113005880 A CN 113005880A
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- pulley
- bridge
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- heave
- heaving
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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
Abstract
The invention belongs to the technical field of bridge vibration control, and provides a pulley-heaving block device for inhibiting the flutter of a long-span bridge, which is a vibration control system temporarily installed on the bridge according to the flutter control requirement, and consists of a heaving block immersed in water, a rope for connecting a pulley block and the heaving block, and an anchorage for providing downward tension. When the bridge vibrates upwards, due to the displacement amplification effect of the pulley block, the heaving block moves upwards in water at a speed which is several times of that of the bridge, the gravity and the downward water resistance of the heaving block do negative work on the bridge, and the vibration energy is consumed; when the bridge vibrates downwards, the heave block and the bridge move approximately synchronously by optimizing design parameters, and the bridge can be efficiently inhibited from vibrating greatly. The reinforced concrete heaving block is more economical than a metal heaving plate, and due to the introduction of the pulley block, the total resistance of the bridge is several times of the gravity and water resistance of the heaving block, so that the control efficiency is higher. The invention has the advantages that: easy dismounting, economical and practical, safe and high-efficient.
Description
Technical Field
The invention belongs to the technical field of bridge wind-induced vibration control research, and relates to a pulley-heave block device for inhibiting the flutter of a long-span bridge.
Background
In recent 20 years, great achievements are made in the construction of large-span bridges at home and abroad, modern large-span bridges mainly represented by cable-stayed bridges and suspension bridges are continuously developed towards a larger span direction, the structural rigidity and the damping are reduced, the large-span bridges are more sensitive to wind load, and the problem of wind resistance of the bridges is more prominent. The wind-induced large-amplitude limit ring vibration and the divergent flutter of the long-span bridge need to be avoided. The traditional measures for controlling the vibration of the long-span bridge mainly comprise pneumatic measures, structural measures and mechanical measures. Aiming at some defects of the traditional flutter control measures, the inventor provides a heave plate damper device for inhibiting the flutter of a cross-sea bridge, namely provides a heave plate damper which is suspended below the bridge and immersed in water, when the heave plate moves in the water, a water body provides strong additional damping force and additional gravity, the heave plate and the bridge are inhibited from vibrating greatly, and the flutter of the bridge is avoided or the critical wind speed and wind resistance safety of the flutter are greatly improved. However, this device still has some disadvantages: (1) in order to ensure that the heave plate has a good control effect, the heave plate needs to be large enough, and the engineering investment is large; (2) in order to ensure that the heave plate has enough strength and rigidity, the heave plate needs to have enough thickness and a reasonable design form, and generally needs a metal material, so that the manufacturing, transportation and disassembly and assembly costs are high; (3) since the heave plate motion is comparable to or less than the bridge motion amplitude, the control efficiency is relatively low. In view of the above disadvantages, the present invention improves and optimizes the device in several aspects, so that the device is more practical, lower in cost, more efficient in control, and has relative advantages and features.
Disclosure of Invention
The invention aims at solving the technical problem of providing a pulley-heaving block device for inhibiting the large-span bridge from fluttering aiming at the requirements of large-span bridge flutter control over sea crossing, river crossing and the like, when a bridge moves upwards, the pulley block amplifies the upward movement displacement and speed of a heaving block which is suspended below the bridge and immersed in water, the acting interval of the water resistance of the heaving block and the water resistance is increased, so that the bridge consumes more energy, when the bridge moves downwards, the heaving block is acted by the gravity, the buoyancy and the water resistance, the heaving block can be close to synchronization with the downward movement of the bridge as far as possible by optimizing the parameters of the density, the size, the shape and the like of the heaving block, so that the vibration input energy to the bridge is reduced, when the next bridge moves upwards for a period, the heaving block plays an energy consumption role again, and the cycle is repeated, and finally the critical wind speed and the wind resistance of the large-span bridge are greatly improved, the vibration of the bridge structure is restrained efficiently.
The technical scheme of the invention is as follows:
a pulley-heaving block device for inhibiting the flutter of a large-span bridge comprises a fixed pulley 1, a movable pulley 2, a first rope 3, a heaving block 4, a second rope 5 and an anchorage 6; the fixed pulleys 1 are fixed at the position of a transverse partition plate with larger local rigidity of a bottom plate or a web plate of the designated section of the main beam, and have enough strength and rigidity. For the built bridge, the fixed pulley 1 can be additionally arranged at the bottom of the main beam in the later period; for the bridge which is not built, the fixed pulley 1 can be preset when the main beam is manufactured. The movable pulley 2 having sufficient rigidity and strength is connected to the fixed pulley 1 by a first rope 3 having sufficient rigidity and strength; one end of a first rope 3 is connected with a certain movable pulley 1, the other end of the first rope is connected with a heaving block 4 placed in water, and the middle of the first rope is surrounded with a plurality of fixed pulleys 1 and movable pulleys 2. The lower end of the movable pulley 2 is connected with an anchorage 6 with enough weight when being placed in water through a second rope 5 with enough rigidity and strength. In order to improve the control efficiency, the horizontal distance between the pulleys is as small as possible to reduce the angle between the first rope 3 and the vertical line between the pulleys. In order to minimize the length of the first rope 3, the vertical distance between the movable pulley 2 and the fixed pulley 1 should not be too large. The spacing cannot be too small, on the one hand, the vertical spacing is small, and the included angle between the first rope 3 and the vertical line is large; on the other hand, the downward vibration of the bridge may be very close to or even collide with the movable sheave 2. In order to reduce the manufacturing cost, the heave block 4 is made of common reinforced concrete materials, the specific structural form and the size are not limited, and relevant design is carried out according to the requirement; the anchorage 6 can be a gravity type reinforced concrete solid block generally, or can be made of other materials, as long as the comprehensive economic performance is good. Under the non-working state, the whole device can be disassembled for storage; under the condition of strong wind (generally, prediction can be carried out according to weather forecast, and threat is caused to flutter and large-amplitude buffeting of the bridge), all components of the device are transported to the site to be quickly spliced and installed, after the strong wind passes, the heaving block, the rope and the movable pulley can be immediately detached without affecting the attractiveness of the bridge and navigation under the sea-crossing bridge, and the fixed pulley and the anchor can be detached and can also be reserved for next use.
The device is generally arranged at a position where the bridge structure is likely to generate large displacement (such as a main span mid-span section and two 1/4 sections), two identical control devices are transversely and symmetrically arranged at the position, and are arranged at two sides of a main beam web as far as possible, so that the torsional vibration of the bridge is controlled more conveniently; the number of the fixed pulleys 1 and the movable pulleys 2, the material, the shape, the size and other parameters of the heaving block 4 are optimized by comprehensively considering the practicability, the safety and the economy so as to meet the requirement of vibration control.
The fixed pulleys 1 and the movable pulleys 2 ensure enough strength and rigidity, generally speaking, the more the number of the pulleys is, the higher the control efficiency is, but the longer the first rope 3 is needed, and the better the comprehensive economy is. But not too much, otherwise the device would be more complex and efficiency might be reduced. 3-4 fixed pulleys and 2-3 movable pulleys are arranged in one set of the device;
the first rope 3 and the second rope 5 ensure enough strength and rigidity; generally, a finished high-strength inhaul cable can be adopted, and the specific type and specification are determined and selected according to actual requirements;
the heave block 4 can adopt a reinforced concrete plate or a galvanized steel box, cheap high-density materials are filled in the heave block, and the size and the weight of the heave block can be designed according to a control target;
the anchorage 6 can adopt a gravity type reinforced concrete block for reducing the construction cost, and can be temporarily transported in a floating way and stored according to the requirement, thereby ensuring that the anchorage can not move under the tension of the second rope 5. After being used, the utility model can be removed and can be reserved for the next use.
The invention has the beneficial effects that: (1) the pulley-heave block device provided by the invention has a simple structure, the vertical displacement of the heave block can be greatly increased by the pulley block and is several times of the vibration displacement of a bridge, so that compared with the traditional heave plate device with the same size, the water resistance and the stroke are relatively larger, and the control efficiency can be improved by several times; (2) because the size of the heave block of the device can be smaller relative to the heave plate due to the larger vibration displacement and speed of the heave block, and a reinforced concrete plate or even a concrete block can be adopted, so the manufacturing cost is greatly lower than that of the heave plate made of metal.
Drawings
Fig. 1 is an overall configuration diagram of a pulley-heave block device and a main beam for suppressing the flutter of a large-span bridge according to the present invention.
Figure 2 is an elevational view of a single pulley-heave block arrangement.
In the figure: 1, fixing a pulley; 2, a movable pulley; 3 a first rope; 4 a heave block; 5 a second rope; 6 anchorage.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the drawings and the technical solutions, but the embodiments of the present invention are not limited thereto:
as shown in fig. 1 and 2, a pulley-heaving block device for suppressing the flutter of a large-span bridge comprises a fixed pulley 1, a movable pulley 2, a first rope 3, a heaving block 4, a second rope 5 and an anchorage 6; the fixed pulleys 1 are fixed at the position of a transverse partition plate with larger local rigidity of a bottom plate or a web plate of the designated section of the main beam, and have enough strength and rigidity. The movable pulley 2 having sufficient rigidity and strength is connected to the fixed pulley 1 by a first rope 3 having sufficient rigidity and strength; one end of a first rope 3 is connected with a certain movable pulley 1, the other end of the first rope is connected with a heaving block 4 placed in water, and the middle of the first rope is surrounded with a plurality of fixed pulleys 1 and movable pulleys 2. The lower end of the movable pulley 2 is connected with an anchorage 6 with enough weight when being placed in water through a second rope 5 with enough rigidity and strength. When the bridge moves upwards, the heaving block 4 is driven to move upwards, the heaving block 4 is acted downwards by the resultant force of gravity, buoyancy and water resistance (related to the heaving block size, the movement speed and the acceleration), and each fixed pulley 1 on the bridge is basically acted downwards by 2 times of the resultant force, so the control efficiency is greatly improved. In addition, because the speed and the acceleration of the heaving block are amplified, the resistance of water is greatly increased, the control efficiency is also increased, or the heaving block size can be reduced under the condition of the same control efficiency, thereby reducing the construction cost. The bridge also need move the displacement that several times was than the bridge when the downward motion, and the tradition is swung the board and is moved speed and probably less, just can adopt the size more that the faster piece that swings of moving speed that just this moment hangs down, need not adopt the metal board that swings that hangs down, consequently can reduce the cost by a wide margin. The device is generally arranged at a position where the bridge structure is likely to generate large displacement (such as a main span mid-span section and two 1/4 sections), two identical control devices are transversely and symmetrically arranged at the position, and are arranged at two sides of a main beam web as far as possible, so that the torsional vibration of the bridge is controlled more conveniently; the number of the fixed pulleys 1 and the movable pulleys 2, the material, the shape, the size and other parameters of the heaving block 4 are optimized by comprehensively considering the practicability, the safety and the economy so as to meet the requirement of vibration control.
The pulley-heave block device for inhibiting the flutter of the long-span bridge, which is provided by the invention, can simultaneously meet the flutter control requirements of the vertical direction and torsion of the bridge, and is economical, practical, safe and efficient.
The foregoing is merely exemplary of the preferred embodiments of the present invention and is not intended to limit the invention in any manner. Any equivalent alterations, modifications or improvements, etc. made to the above examples by those skilled in the art using the teachings of the present invention, are still within the scope of the present invention.
Claims (8)
1. A pulley-heaving block device for inhibiting the large-span bridge from fluttering is characterized by comprising a fixed pulley (1), a movable pulley (2), a first rope (3), a heaving block (4), a second rope (5) and an anchor (6); the fixed pulleys (1) are fixed at the position of a transverse partition plate with larger local rigidity of a bottom plate or a web plate of the designated section of the main beam; for the built bridge, a fixed pulley (1) is additionally arranged at the bottom of a main beam; for an unestablished bridge, a fixed pulley (1) is preset when a main beam is manufactured; the movable pulley (2) is connected with the fixed pulley (1) through a first rope (3); one end of a first rope (3) is connected with the movable pulley (1), the other end of the first rope is connected with a heaving block (4) placed in water, and a plurality of fixed pulleys (1) and movable pulleys (2) are encircled in the middle; the lower end of the movable pulley (2) is connected with an anchorage (6) placed in water through a second rope (5); in order to improve the control efficiency, the horizontal distance between the pulleys is as small as possible so as to reduce the included angle between the first rope (3) and the vertical line between the pulleys.
2. The pulley-heave block device for restraining the flutter of the large-span bridge according to claim 1, wherein 3-4 fixed pulleys (1) and 2-3 movable pulleys (2) are arranged in the pulley-heave block device for restraining the flutter of the large-span bridge.
3. The pulley-heave block device for inhibiting the flutter of the large-span bridge according to claim 1 or 2, wherein the heave block (4) is made of reinforced concrete plates or galvanized steel boxes.
4. The pulley-heave block device for restraining the flutter of the large-span bridge according to claim 1 or 2, wherein the anchor (6) is a gravity type reinforced concrete block.
5. The pulley-heave block device for inhibiting the flutter of the large-span bridge according to claim 3, wherein the anchor (6) is a gravity type reinforced concrete block.
6. The pulley-heave block device for restraining the large-span bridge from fluttering according to claim 1, 2 or 5, wherein the pulley-heave block device for restraining the large-span bridge from fluttering is arranged at a position where the bridge structure can be greatly displaced, and two identical control devices are symmetrically arranged at the transverse direction at the position and are arranged at the two sides of a main beam web plate as far as possible.
7. The pulley-heave block device for restraining the large-span bridge from fluttering according to claim 3, wherein the pulley-heave block device for restraining the large-span bridge from fluttering is arranged at a position where the bridge structure is likely to have large displacement, and two identical control devices are symmetrically arranged along the transverse direction at the position and are arranged on two sides of a girder web plate as far as possible.
8. The pulley-heave block device for restraining the large-span bridge from fluttering according to claim 4, wherein the pulley-heave block device for restraining the large-span bridge from fluttering is arranged at a position where the bridge structure is likely to have large displacement, and two identical control devices are symmetrically arranged along the transverse direction at the position and are arranged on two sides of a girder web plate as far as possible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110249264.0A CN113005880A (en) | 2021-03-08 | 2021-03-08 | Pulley-heave block device for inhibiting large-span bridge from fluttering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110249264.0A CN113005880A (en) | 2021-03-08 | 2021-03-08 | Pulley-heave block device for inhibiting large-span bridge from fluttering |
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| CN113005880A true CN113005880A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110249264.0A Pending CN113005880A (en) | 2021-03-08 | 2021-03-08 | Pulley-heave block device for inhibiting large-span bridge from fluttering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356035A (en) * | 2021-07-12 | 2021-09-07 | 长沙理工大学 | Water body damping device and method for controlling vortex vibration and flutter of sea-crossing and river-crossing bridge |
Citations (8)
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| JPH10141432A (en) * | 1996-11-08 | 1998-05-29 | Mitsubishi Heavy Ind Ltd | Vibration damping device |
| CN1651656A (en) * | 2004-12-07 | 2005-08-10 | 清华大学 | Stayed cable shock attenuation device |
| CN101260646A (en) * | 2008-04-14 | 2008-09-10 | 李有为 | Great span bridge lower damper system for wind and water resistance |
| CN101571099A (en) * | 2008-05-04 | 2009-11-04 | 上海驰风机电科技有限公司 | Tower tube vibration absorber |
| CN102776835A (en) * | 2012-08-13 | 2012-11-14 | 长安大学 | Underwater damper for arched steel tower in construction condition |
| CN103898830A (en) * | 2013-12-18 | 2014-07-02 | 长安大学 | Vibration controller and cable-stayed bridge system based on same and in construction stage |
| WO2014189962A1 (en) * | 2013-05-21 | 2014-11-27 | Safway Services, Llc | Work platform system including suspended paneled portion and method of implementing same |
| CN105274936A (en) * | 2015-11-20 | 2016-01-27 | 长安大学 | Vibration inhibition method and apparatus for controlling vibration of bridge tower |
-
2021
- 2021-03-08 CN CN202110249264.0A patent/CN113005880A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10141432A (en) * | 1996-11-08 | 1998-05-29 | Mitsubishi Heavy Ind Ltd | Vibration damping device |
| CN1651656A (en) * | 2004-12-07 | 2005-08-10 | 清华大学 | Stayed cable shock attenuation device |
| CN101260646A (en) * | 2008-04-14 | 2008-09-10 | 李有为 | Great span bridge lower damper system for wind and water resistance |
| CN101571099A (en) * | 2008-05-04 | 2009-11-04 | 上海驰风机电科技有限公司 | Tower tube vibration absorber |
| CN102776835A (en) * | 2012-08-13 | 2012-11-14 | 长安大学 | Underwater damper for arched steel tower in construction condition |
| WO2014189962A1 (en) * | 2013-05-21 | 2014-11-27 | Safway Services, Llc | Work platform system including suspended paneled portion and method of implementing same |
| CN103898830A (en) * | 2013-12-18 | 2014-07-02 | 长安大学 | Vibration controller and cable-stayed bridge system based on same and in construction stage |
| CN105274936A (en) * | 2015-11-20 | 2016-01-27 | 长安大学 | Vibration inhibition method and apparatus for controlling vibration of bridge tower |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356035A (en) * | 2021-07-12 | 2021-09-07 | 长沙理工大学 | Water body damping device and method for controlling vortex vibration and flutter of sea-crossing and river-crossing bridge |
| CN113356035B (en) * | 2021-07-12 | 2022-02-18 | 长沙理工大学 | Water body damping device and method for controlling vortex vibration and flutter of sea-crossing and river-crossing bridge |
| US11535988B1 (en) | 2021-07-12 | 2022-12-27 | Changsha University Of Science And Technology | Water damping device and method for controlling vortex-induced vibration and fluttering of sea-crossing or river-crossing bridges |
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Application publication date: 20210622 |
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