CN108385518B - Bridge-following cable differential uniform-variation expansion compensation device and construction method thereof - Google Patents
Bridge-following cable differential uniform-variation expansion compensation device and construction method thereof Download PDFInfo
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- CN108385518B CN108385518B CN201810205883.8A CN201810205883A CN108385518B CN 108385518 B CN108385518 B CN 108385518B CN 201810205883 A CN201810205883 A CN 201810205883A CN 108385518 B CN108385518 B CN 108385518B
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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
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a differential uniform variation telescopic compensation device of a bridge-following cable and a construction method thereof. The existing telescopic compensation device cannot be miniaturized and modularized and cannot be applied to a bridge box body. The differential uniform variable telescopic compensation device of the bridge-following cable comprises at least one differential compensation unit; the differential compensation unit comprises an arched elastic steel plate for bearing the power cable, a front pull rod, a rear pull rod and a homodromous differential device for being fixed on a bridge platform; the two ends of the arched elastic steel plate are respectively connected to the front rotating shaft and the rear rotating shaft, the two ends of the rotating shaft are respectively connected with a pulley, the pulleys are arranged on a guide rail, and the guide rail is used for supporting the pulleys; the front and rear parts of the homodromous differential device are respectively connected with a front pull rod and a rear pull rod, and the front and rear connecting rods are respectively connected with a front rotating shaft and a rear rotating shaft. The telescopic compensation device optimizes the structure, has the characteristics of miniaturization, modularization and generalization, and can greatly save investment.
Description
Technical Field
The invention relates to the field of auxiliary facilities of bridge-following power cables, in particular to a bridge-following cable differential uniform variation expansion compensation device and a construction method thereof, which are specially used for solving the engineering problem of frequent extension and compression of a bridge-following cable caused by the width change of different expansion joints at the butt joint of a long-distance bridge deck.
Background
With the progress of technology and the development of age, under the conditions of tension of overhead line channels, high sea cable investment cost and high technical difficulty, high-voltage line cables are laid along with bridges, and are accepted and accepted by highway bridge design and management departments.
The largest technical difficulty of the following bridge cabling engineering is that the gap change of the bridge deck butt joint position caused by the climate environment, bridge deck load and other factors must be effectively solved. These periodic variations can lead to frequent elongation and compression of the cable laid between the two bridge end slits, causing fatigue failure of the power cable. For the sea-crossing bridge, different expansion joints exist in different sections, and especially the expansion amount generated at the end parts of a large-span cable-stayed bridge and a suspension bridge deck on a main channel can exceed more than 1 m. The flexible bending of the general cable laying mode can not meet the flexible deformation requirement of the bridge. This engineering problem can be solved well only by means of an OFFSET (OFFSET) with the bridge cable.
The core idea of the design of the telescopic compensation device (OFFSET) device is that the whole arc length should be uniformly and equivalently bent in the extension and contraction process, so that the cable installed on the telescopic compensation device ensures that the daily strain and the accumulated fatigue failure coefficient of the cable meet the specified requirements under the condition of allowable bending radius.
The existing telescopic compensation device (OFFSET) at home and abroad forms an arc-shaped arrangement along with the bridge cable in the horizontal direction, is fixed on a cable bracket with the same arc shape, and pulls the cable bracket to move by the sliding cable frame through the equally-dividing connecting rod mechanism, so that the telescopic of the bridge cable is driven. When the movable bridge deck contracts, the bending radius of the arc-shaped cable is increased, the arc chord is lengthened, and the elongation is equal to the contraction of the movable bridge deck. When the movable bridge deck stretches, the bending radius of the arc-shaped cable is reduced, the arc chord is shortened, and the retraction amount is equal to the stretching amount of the movable bridge deck. The device is placed in an arc shape in the horizontal direction, the requirement on the installation occupied area is large, an additional steel platform is required to be built on the periphery of the bridge box in general, the mechanism is complex, and the investment cost is high.
The telescopic compensation device (OFFSET) cannot be miniaturized and modularized, and cannot be applied to a bridge box body.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art, and provide the differential uniform variable expansion compensation device with the bridge cable with wide area expansion compensation capability, which realizes miniaturization and modularization in a limited bridge box (or on a platform) so as to simplify the structure and save the investment.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a differential uniform variable expansion compensation device of a bridge-following cable comprises at least one differential compensation unit;
the differential compensation unit comprises an arched elastic steel plate for bearing the power cable, a front pull rod, a rear pull rod and a homodromous differential device for being fixed on a bridge platform;
the two ends of the arched elastic steel plate are respectively connected to the front rotating shaft and the rear rotating shaft, the two ends of the rotating shaft are respectively connected with a pulley, the pulleys are arranged on a guide rail, and the guide rail is used for supporting the pulleys;
the front and rear parts of the homodromous differential device are respectively connected with a front pull rod and a rear pull rod, and the front and rear connecting rods are respectively connected with a front rotating shaft and a rear rotating shaft;
the same-direction differential device, the connecting rod, the rotating shaft and the pulleys form cooperative motion, and the arched elastic steel plate moves along with the rotating shaft to open and close.
The invention provides a modular construction bridge-following cable wide-area expansion compensation device under the condition of utilizing limited space of a bridge box (or a platform).
As a supplement to the above technical scheme, the differential compensation unit further comprises two splayed movable supporting arms, wherein the movable supporting arms are used for supporting the arched elastic steel plates, the upper ends of the two movable supporting arms are connected with the front rotating shaft and the rear rotating shaft in a shaft way, and the lower ends of the two movable supporting arms are connected with the front rotating shaft and the rear rotating shaft respectively.
As a supplement to the technical scheme, the homodromous differential device is a gear differential or a lever differential.
As the supplement of the technical proposal, the guide rails are arranged in double rows and fixed on the bridge platform.
As the supplement of the technical proposal, a plurality of differential compensation units are spliced from front to back.
As a supplement to the technical scheme, the homodromous differential device is provided with a differential coefficient K of pull rod displacement at two sides, and the differential compensation units are logically spliced into a device with wide-area expansion compensation capability.
As a supplement to the above technical scheme, during splicing, the differential coefficient K of the homodromous differential device in each differential compensation unit is 0,1/2,2/3, … … n/(n+1), n is a natural number; one end of the K=0 differential compensation unit is fixed on one side bridge platform of the bridge gap, and the other end of the K=0 differential compensation unit moves, wherein both ends of the K= (n-1)/n differential compensation unit are simultaneously differential; one end of the differential compensation unit with K=n/(n+1) is fixed on the bridge platform at the other side of the bridge gap, and the other end moves.
The other technical scheme of the invention is as follows: the construction method of differential uniform variable expansion compensation device for bridge-following cable utilizes the elasticity of arched elastic steel plate in differential compensation unit and arch structure to load power three-phase cable to make synchronous uniform deformation, and utilizes the cooperative motion of pull rod, equidirectional differential device, rotating shaft, pulley and guide rail in the differential compensation unit to implement controllable, superimposed and uniform variable differential compensation, and several differential compensation units are continuously spliced into compensation device with wide area expansion compensation capability so as to adapt to bridge-following cable expansion compensation of expansion joints with various sizes.
As a supplement to the above construction method, each differential compensation unit is responsible for the ramp and the equivalent compensation range of the unit, and each differential compensation unit only needs to preset the differential coefficient K of the unit homodromous differential device; the units are continuously connected to meet the requirements of different compensation ranges.
As a supplement to the above construction method, the differential compensation units are arranged on the same side or both sides of the bridge gap.
The invention has the following beneficial effects: the invention optimizes the structure, has the characteristics of miniaturization, modularization and universalization, and can greatly save investment. The constructed differential uniform variable expansion compensation device for the bridge-following cable stretches along with the bridge gap, has unique motion tracks, ensures that the compensation quantity of each differential compensation unit is balanced, ensures that each arched elastic steel plate is opened and closed uniformly, and ensures that the bending deformation of the power three-phase cable on the arched elastic steel plate is synchronous and uniform. The invention solves the engineering problem of frequent extension and compression of the bridge-following cable caused by the width change of different expansion joints at the butt joint of the bridge deck of the long-distance bridge.
Drawings
FIG. 1 is a schematic diagram of a differential compensation unit according to the present invention;
FIG. 2 is a schematic structural diagram of a differential homogeneous variable expansion compensation device with bridge cables according to the present invention;
fig. 3 is a schematic structural diagram of the homodromous differential device of the present invention.
In fig. 2, the first differential compensation unit, the second differential compensation unit and the third differential compensation unit are spliced to form the telescopic compensation device.
The differential compensation unit consists of an arched elastic steel plate, movable supporting arms (two are arranged in a splayed manner), a pull rod, a homodromous differential device, pulleys, a guide rail and a rotating shaft. One end of the first differential compensation unit is fixed on a bridge platform at one telescopic side, and the homodromous differential device is also fixed on the bridge platform; the double arrow indicates the back and forth expansion of the bridge gap, i.e. the relative movement of the bridge on the other side.
In fig. 3, the homodromous differential device is fixed on the bridge deck. The ratio of the movement amounts Δm and Δn of both ends thereof is a differential coefficient k=n/(n+1), N being a natural number 0,1,2,3, … …. The n of the telescopic compensation device constructed by the first differential compensation unit module, the second differential compensation unit module and the third differential compensation unit module corresponding to the embodiment is 0,1 and 2.K is 0,1/2,2/3 respectively.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects and advantages of the invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The differential uniform variable expansion compensation device of the bridge-associated cable shown in fig. 2 is formed by splicing a first differential compensation unit 11, a second differential compensation unit 12 and a third differential compensation unit 13.
As shown in fig. 1, the differential compensation unit comprises an arched elastic steel plate 1 for bearing a power cable 10, a front pull rod 2, a rear pull rod 3, a homodromous differential device 4 for being fixed on a bridge platform and two movable supporting arms 9 distributed in a splayed shape.
The two ends of the arched elastic steel plate 1 are respectively connected to the front rotating shaft 5 and the rear rotating shaft 6, two ends of the rotating shaft are respectively connected with a pulley 7, the pulleys 7 are arranged on a guide rail 8, and the guide rail 8 is used for supporting the pulleys 7;
the front and the rear of the homodromous differential device 4 are respectively connected with a front pull rod 2 and a rear pull rod 3, and the front and the rear connecting rods 2 and 3 are respectively connected with a front rotating shaft 5 and a rear rotating shaft 6;
the same-direction differential device, the connecting rod, the rotating shaft and the pulleys form cooperative motion, and the arched elastic steel plate moves along with the rotating shaft to open and close.
The movable supporting arms 9 are used for supporting the arched elastic steel plates 1, the upper ends of the two movable supporting arms 9 are connected with the shaft, and the lower ends of the two movable supporting arms 9 are respectively connected with the front rotating shaft 5 and the rear rotating shaft 6.
The same direction differential device 4 is a gear differential or a lever differential. The guide rails 8 are arranged in double rows and fixed on the bridge platform.
As shown in FIG. 3, the homodromous differential device has a differential coefficient K of pull rod displacement at two sides, and the differential compensation units are logically spliced into a device with wide-area expansion compensation capability.
In fig. 2, when the double-headed arrow moves to the right by 3X (X is the moving amount), that is, the F point is displaced by 3X, the displacement of the E point becomes 2X by the differential compensation unit 13, and the E point is hard-connected to the D point, so that the displacement of the D point is also 2X; under the action of the differential compensation unit 12, the displacement of the point C is changed into X, and the point C is hard connected with the point B, so that the displacement of the point B is also X; the point A is fixed, and the displacement is always zero. This process is simultaneous, so that B-a=x, D-c=x, and F-e=x, that is, the simultaneous opening amounts of the three arched elastic steel plates are all X, thus achieving the purpose of uniform deformation of the power cable mounted thereon.
When the double-headed arrow moves 3X (X is the amount of movement) to the left, the principle is the same, but it becomes a folding process. And will not be described in detail.
Example 2
The embodiment provides a construction method of a differential uniform variable expansion compensation device for a bridge-following cable, which utilizes the elasticity of an arch-shaped elastic steel plate and the synchronous balanced deformation of an arch-shaped structure bearing power three-phase cable in a differential compensation unit in the embodiment 1, realizes controllable, overlapped and uniform differential compensation through the cooperative motion of a pull rod, a homodromous differential device, a rotating shaft, a pulley and a guide rail in the differential compensation unit, and is formed by continuously splicing a plurality of differential compensation units according to logic to form a compensation device with wide area expansion compensation capability, so as to adapt to the expansion compensation of the bridge-following cable of expansion joints with various sizes of bridges.
Each differential compensation unit is responsible for the ramp and the same compensation range of the unit, and each differential compensation unit only needs to preset the differential coefficient K of the unit homodromous differential device; the units are continuously connected to meet the requirements of different compensation ranges.
The examples described above represent only embodiments of the invention and are not to be construed as limiting the scope of the invention, nor are they to be construed as limiting the invention in any way. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the invention.
Claims (6)
1. The differential uniform variable expansion compensation device of the bridge-following cable is characterized by comprising at least one differential compensation unit;
the differential compensation unit comprises an arched elastic steel plate (1) for bearing a power cable, a front pull rod (2), a rear pull rod (3) and a homodromous differential device (4) for being fixed on a bridge platform;
the two ends of the arched elastic steel plate (1) are respectively connected to the front rotating shaft (5) and the rear rotating shaft (6), the two ends of the rotating shaft are respectively connected with a pulley (7), the pulleys (7) are arranged on the guide rail (8), and the guide rail (8) is used for supporting the pulleys (7);
the front and the rear of the homodromous differential device (4) are respectively connected with a front pull rod (2) and a rear pull rod (3), and the front and the rear connecting rods (2, 3) are respectively connected with a front rotating shaft (5) and a rear rotating shaft (6);
the same-direction differential device, the connecting rod, the rotating shaft and the pulleys form cooperative movement, and the arched elastic steel plate moves along with the rotating shaft to open and close;
the differential compensation unit also comprises two movable supporting arms (9) which are distributed in a splayed shape, wherein the movable supporting arms (9) are used for supporting the arched elastic steel plates (1), the upper ends of the two movable supporting arms (9) are connected with the front rotating shafts (5) and the rear rotating shafts (6) in a shaft way, and the lower ends of the two movable supporting arms are connected with the front rotating shafts (5) and the rear rotating shafts (6) respectively;
the differential compensation units are formed by splicing a plurality of differential compensation units from front to back in sequence;
the homodromous differential device is provided with a differential coefficient K of pull rod displacement at two sides, and the differential compensation units are logically spliced into a device with wide area expansion compensation capability;
when in splicing, the differential coefficient K of the homodromous differential device in each differential compensation unit is 0,1/2,2/3 and … … n/(n+1), wherein n is a natural number; one end of the K=0 differential compensation unit is fixed on one side bridge platform of the bridge gap, and the other end of the K=0 differential compensation unit moves, wherein both ends of the K= (n-1)/n differential compensation unit are simultaneously differential; one end of the differential compensation unit with K=n/(n+1) is fixed on the bridge platform at the other side of the bridge gap, and the other end moves.
2. The differential homogeneous telescopic compensation device for a bridge-associated cable according to claim 1, wherein the homodromous differential device (4) is a gear differential or a lever differential.
3. The differential homogeneous telescopic compensation device for bridge-associated cables according to claim 1, wherein the guide rails (8) are arranged in double rows and fixed on the bridge platform.
4. The method for constructing the differential uniform variable expansion compensation device of the bridge-following cable according to any one of claims 1-3 is characterized in that the elasticity and arch structure of an arch-shaped elastic steel plate in a differential compensation unit are utilized to bear synchronous and balanced deformation of an electric three-phase cable, controllable, overlapped and uniform differential compensation is realized through cooperative movement of a pull rod, a homodromous differential device, a rotating shaft, a pulley and a guide rail in the differential compensation unit, and a plurality of differential compensation units are logically and continuously spliced to form the compensation device with wide area expansion compensation capability, so that the bridge-following cable expansion compensation device is suitable for expansion joints with various sizes of bridges.
5. The construction method according to claim 4, wherein each differential compensation unit is responsible for the ramp and equivalent compensation range of the unit, and each differential compensation unit only needs to preset the differential coefficient K of the unit homodromous differential device; the units are continuously connected to meet the requirements of different compensation ranges.
6. The construction method according to claim 4, wherein the plurality of differential compensation units are arranged on the same side or both sides of the bridge gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205883.8A CN108385518B (en) | 2018-03-13 | 2018-03-13 | Bridge-following cable differential uniform-variation expansion compensation device and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810205883.8A CN108385518B (en) | 2018-03-13 | 2018-03-13 | Bridge-following cable differential uniform-variation expansion compensation device and construction method thereof |
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| Publication Number | Publication Date |
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| CN108385518A CN108385518A (en) | 2018-08-10 |
| CN108385518B true CN108385518B (en) | 2023-09-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110106783B (en) * | 2019-05-31 | 2023-12-15 | 中铁第四勘察设计院集团有限公司 | Cable upper bridge structure and construction method |
| CN111244841B (en) * | 2020-03-20 | 2021-04-23 | 浙江荣正管业有限公司 | MPP cable protection pipe |
| CN114566924B (en) * | 2021-11-22 | 2023-10-27 | 浙江华云电力工程设计咨询有限公司 | Horizontal modularized bridge-following cable expansion compensation device |
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