CN112853918B - Device and method for actively regulating and controlling lift force in sliding state of main cable and saddle of suspension bridge - Google Patents
Device and method for actively regulating and controlling lift force in sliding state of main cable and saddle of suspension bridge Download PDFInfo
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- CN112853918B CN112853918B CN202110261904.XA CN202110261904A CN112853918B CN 112853918 B CN112853918 B CN 112853918B CN 202110261904 A CN202110261904 A CN 202110261904A CN 112853918 B CN112853918 B CN 112853918B
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- 239000000725 suspension Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 14
- 230000001276 controlling effect Effects 0.000 title claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000005192 partition Methods 0.000 claims abstract description 9
- 230000005291 magnetic effect Effects 0.000 claims description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 230000033228 biological regulation Effects 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 10
- 238000013461 design Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a device and a method for actively regulating and controlling lift force in a sliding state of a main cable and a saddle of a suspension bridge, wherein the device comprises a suspension electromagnet, a partition plate and a permanent magnet; the suspension electromagnet is embedded at the bottom of the saddle groove of the saddle; a strand groove is formed between two adjacent partition plates; the number of the groove ways of each cable strand is equal to that of the cable strands; the suspension electromagnet positioned in each strand slot way is provided with a plurality of convex tooth electromagnets along the longitudinal bridge direction; the top surface of each convex tooth electromagnet is an arc-shaped surface, the connecting lines of the top surfaces of all the convex tooth electromagnets are arc-shaped arcs, and the shapes of the arc-shaped arcs are the same as those of the main cable after the convex tooth electromagnets are seated; the cross-sectional area of the convex tooth electromagnet is gradually reduced from the arch top of the arc arch to the arch bottoms at two sides; permanent magnet blocks with cross sectional areas matched with the cross sectional areas are arranged above each convex tooth electromagnet; and the top surface of each permanent magnet block is provided with a pressure sensor. The invention can effectively eliminate the unbalanced force of the main cables at two sides of the main tower in the construction process of the suspension bridge.
Description
Technical Field
The invention relates to the field of bridge engineering design and construction, in particular to a device and a method for actively regulating and controlling lift force in a sliding state of a main cable and a saddle of a suspension bridge.
Background
In the construction process of the stiffening beam of the suspension bridge, the root of the main tower bears large bending moment due to the unbalanced cable force of the main cables on the two sides of the main tower (namely the unbalanced cable force of the main cables along the longitudinal bridge direction), so that the safety, the stability and the durability of the main tower are seriously influenced. In the actual construction process, the cable saddle pre-deviation is set to reduce the influence caused by unbalanced main cable force, but the method is complicated in construction, the cable saddle needs to be pushed for many times, and the fine pre-deviation calculation is needed; once the calculation has errors, the deviation can not be corrected almost, and the stress of the main tower is unbalanced. Therefore, how to effectively eliminate the unbalanced force of the main cables on the two sides of the main tower in the construction process of the suspension bridge is a key technology for constructing the suspension bridge.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a device and a method for actively regulating and controlling the lift force of a suspension bridge main cable in a saddle sliding state, which can effectively eliminate the unbalanced force of main cables on two sides of a main tower in the construction process of the suspension bridge.
In order to solve the technical problems, the invention adopts the technical scheme that:
a device for actively regulating and controlling lift force of a main cable-saddle sliding state of a suspension bridge comprises a suspension electromagnet, a partition plate and a permanent magnet.
The suspension electromagnet is embedded at the bottom of the saddle groove of the saddle.
The baffle is evenly installed at suspension electro-magnet top along the cross bridge to, forms a strand slot way between two adjacent baffles. The number of the strand grooves in each saddle is equal to the number of the strands in the corresponding main cable.
The suspension electromagnet in each strand slot is provided with a plurality of convex tooth electromagnets along the longitudinal bridge direction. The top surface of each convex tooth electromagnet is an arc-shaped surface, the connecting lines of the top surfaces of all the convex tooth electromagnets are arc-shaped arcs, and the shapes of the arc-shaped arcs are the same as those of the main cable after the convex tooth electromagnets are seated. The cross-sectional area of the convex tooth electromagnet is gradually reduced from the arch top of the arc arch to the arch bottoms at two sides.
A permanent magnet block with the cross section area matched with the convex tooth electromagnet is arranged above each convex tooth electromagnet, and all the permanent magnet blocks in each cable strand groove form a group of permanent magnets. The top surface connecting line of each group of permanent magnets is also an arch arc with the same shape as the main cable after sitting. And the top surface of each permanent magnet block is provided with a pressure sensor.
Each permanent magnet block is connected with the convex tooth electromagnet positioned right below through an insulated free telescopic guide component.
The freely telescopic guide assembly comprises an insulating sleeve and an insulating telescopic rod. The insulating sleeve is vertically embedded in the convex tooth electromagnet, and the top surface of the insulating sleeve is not higher than that of the convex tooth electromagnet. The bottom end of the insulating telescopic rod is inserted into the insulating sleeve and is connected with the inner wall of the insulating sleeve in a sliding mode. The top end of the insulating telescopic rod is fixedly arranged on the permanent magnet block.
A coil placing groove is formed between the adjacent convex tooth electromagnets and is used for winding an electrified coil of the suspension electromagnet; the input end of the electrified coil is connected with the positive electrode of the power supply, and the output end of the electrified coil is sequentially connected with the power amplifier, the embedded DSP controller and the negative electrode of the power supply.
And a zinc filling block is arranged at the top of each strand groove and used for filling the strand groove space at the top of the main cable element strand.
A method for actively regulating and controlling lift force of a suspension bridge main cable-saddle in a sliding state comprises the following steps.
Further comprises the step 9 of filling zinc filling blocks: and a zinc filling block is filled in the cable strand groove way at the top of each cable strand, and two top side walls of the cable saddle are fixed.
In the step 5, the electromagnetic repulsion force two between the vault permanent magnet blocks and the vault convex tooth electromagnets is one eighth to one fifth of the self weight of the corresponding cable strand.
In the step 2, the cross-sectional area of the arch crown convex tooth electromagnet is twice that of the arch bottom convex tooth electromagnet.
The invention has the following beneficial effects:
1. when a main cable at the top of the main tower is erected, current is conducted to the suspension electromagnet, and unbalanced electromagnetic suspension force provided between the arch crown and the arch bottom can weaken the dead weight of a main cable strand and can also ensure that the main cable strand can be successfully seated in a curved arch shape; the subsequent current and output power of the device are adjusted, so that the vertical pressure generated by the main cable on the bottom surface of the saddle is effectively reduced, the friction between the saddle and the main cable is further reduced, the relative sliding of the main cable of the suspension bridge relative to the saddle of the main tower is actively allowed, the complex design of pre-deviation of the saddle of the suspension bridge or pre-deviation of the main tower is avoided, and the unfavorable stress state of the main tower in the construction stage is greatly improved.
2. When the suspension bridge is in operation, power supply is stopped, the permanent magnet blocks attract the main cable, vertical pressure of the main cable on the bottom surface of the saddle is improved, friction force between the saddle and the main cable is enhanced, partial unbalance force borne by the main cable is offset, and sliding of the main cable on the top of the bridge tower is limited.
3. The suspension electromagnet is embedded at the bottom of the saddle groove of the saddle, so that complicated bolt connection or hoop assembly and disassembly are avoided, and the instability problem of the device during working is well avoided.
Drawings
Fig. 1 shows a schematic structural diagram of a device for actively regulating lift force in a main cable-saddle slip state of a suspension bridge.
Fig. 2 shows an axonometric view (empty cable state) of the active control lift device for the main cable-saddle slip state of the suspension bridge.
Fig. 3 shows a section view (empty cable state) of the active lift regulation device for the suspension bridge main cable-saddle slip state.
Fig. 4 shows a diagram of the position relationship between the permanent magnet blocks and the main cable strand when the permanent magnet blocks are suspended and lifted.
Fig. 5 shows a schematic view of the main strand position after the main strand is seated and the levitation electromagnet is de-energized in accordance with the present invention.
Fig. 6 shows the schematic view of the internal working principle of the suspension electromagnet and the permanent magnet block in the invention.
Among them are:
1. filling zinc blocks; 2. a cable strand; 3. a partition plate;
4. a suspension electromagnet; 41. a convex tooth electromagnet; 42. an arch crown electromagnet; 43. an arched electromagnet; 44. an under-arch electromagnet;
5. permanent magnet blocks; 51. vault permanent magnet block; 52. an arched permanent magnet block; 53. an arch bottom permanent magnet block;
6. an electrified coil; 7. a circuit flux; 8. embedding a DSP controller; 9. a pressure sensor; 10. a free telescopic guide assembly; 11. a power amplifier.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1, 2 and 3, the device for actively regulating and controlling the lift force of the suspension bridge under the main cable-saddle slip state comprises a suspension electromagnet 4, a partition plate 3 and a permanent magnet.
In the present invention, the longitudinal section of the main cable is preferably a regular hexagon.
The suspension electromagnet is embedded at the bottom of the saddle groove of the saddle, and the longitudinal section of the suspension electromagnet is preferably V-shaped.
The partition plates are uniformly arranged (preferably welded) at the top of the suspension electromagnet along the transverse bridge direction, and a strand slot is formed between every two adjacent partition plates. The number of the strand grooves in each saddle is equal to the number of the strands in the corresponding main cable.
The suspension electromagnet in each strand slot is provided with a plurality of convex tooth electromagnets 41 along the longitudinal bridge direction. The top surface of each convex tooth electromagnet is an arc-shaped surface, the connecting lines of the top surfaces of all the convex tooth electromagnets are arc-shaped arcs, and the shapes of the arc-shaped arcs are the same as those of the main cable after the convex tooth electromagnets are seated. Therefore, the cable strand 2 of the main cable is used for constructing facilities, the existing production process and equipment do not need to be changed, and the cost is not increased.
The arrangement of the convex tooth electromagnets enables two adjacent convex tooth electromagnets and the suspension electromagnet between the two adjacent convex tooth electromagnets to form a U-shaped electromagnet, and the two convex tooth electromagnets are two U-shaped supporting legs of the U-shaped electromagnet. So set up, can directly increase the effect area that produces the suspension lift under the certain condition of circular telegram coil current, improve device regulation and control effect.
And a coil placing groove is formed between the adjacent convex tooth electromagnets and used for winding an electrified coil 6 of the suspension electromagnet. In this embodiment, the energizing coil is preferably wound around the bottom transverse magnet of the U-shaped electromagnet, and only the upper side energizing coil wound around the floating electromagnet is shown in fig. 5.
As shown in fig. 6, the input end of the electrified coil is connected with the positive electrode of the power supply, and the output end of the electrified coil is sequentially connected with the power amplifier, the embedded DSP controller and the negative electrode of the power supply.
The embedded DSP controller is a microprocessor particularly suitable for digital signal processing operation, a control system taking a DSP device as a core has very fast data processing capacity and good expansion capacity, has a complete main program control flow, adopts a fuzzy pressure-bearing control strategy, and has invariance, robustness and adaptivity when subjected to parameter perturbation and external interference. And the embedded DSP controller 8 is arranged in the suspension electromagnet 4 and is mainly responsible for providing a pressure-bearing digital signal of the suspension electromagnet 4, calculating a reasonable regulation current value according to the parameters of the transfer fuzzy pressure-bearing control algorithm and feeding back an analog signal corresponding to the obtained regulation current value.
Furthermore, in the invention, the eddy current type pressure sensor dynamically monitors the pressure of the main cable strand in the tank space on the top bearing surface of the permanent magnet block in real time and transmits the pressure to the embedded DSP controller. The power amplifier is internally provided with a waveform generating circuit, a photoelectric isolating circuit and a suspension system driving circuit, and can manually regulate and control the selection of the multiplying power numerical value.
The length of the coil placing groove along the bridge direction, namely the groove width of the coil placing groove, cannot be overlong. On the one hand, if the slot width is large, the dead area of the pole face of the electromagnet and the main cable strand is small, so that the suspension force is lost, and the larger the slot width is, the larger the lost force is. Therefore, when the radial height of the convex tooth electromagnet is small, a short coil placement groove width should be adopted. On the other hand, because the electromagnet bears the falling force of the main cable strand in the groove during operation, the strength and rigidity of the electromagnet need to be considered structurally, and the larger the groove width is, the larger the deformation is when the electromagnet is stressed.
Furthermore, the cross-sectional area of the convex tooth electromagnet is gradually reduced from the arch top of the arc arch to the arch bottoms at two sides.
The convex tooth electromagnet positioned at the arch top of the arch arc is an arch top convex tooth electromagnet 42, the convex tooth electromagnets positioned at the two arch bottoms in the arch arc are arch bottom convex tooth electromagnets 44, and the convex tooth electromagnet positioned between the arch top and the arch bottom is an arch arc convex tooth electromagnet 43.
That is, the cross-sectional area of the electromagnet with convex teeth at the top is the largest, in this embodiment, the cross-sectional area of the electromagnet with convex teeth at the top is preferably 2 times that of the electromagnet with convex teeth at the bottom. Wherein, the cross-sectional areas of the two arch bottom convex tooth electromagnets are the same.
A permanent magnet block with the cross section area matched with the convex tooth electromagnet is arranged above each convex tooth electromagnet, and all the permanent magnet blocks in each cable strand groove form a group of permanent magnets. The top surface connecting line of each group of permanent magnets is also an arch arc with the same shape as the main cable after sitting.
The permanent magnet at the arch top of the arch is called an arch top permanent magnet 51, the permanent magnet at the arch bottom of the arch is called an arch bottom permanent magnet 53, and the permanent magnet between the arch top and the arch bottom is called an arch top permanent magnet 52.
That is, the cross-sectional area of the permanent magnet blocks 51 of the arch top is opposite to that of the convex tooth electromagnet of the arch top, and corresponds to each other one by one; the cross sectional areas of the arch bottom permanent magnet blocks and the arch bottom convex tooth electromagnets are opposite and correspond one to one; the arched permanent magnet blocks are opposite to the cross sectional areas of the corresponding arched convex tooth electromagnets and are in one-to-one correspondence.
Further, a pressure sensor 9 is arranged on the top surface of each permanent magnet block, and the pressure sensor is preferably an eddy current type pressure sensor. The pressure sensor can monitor the contact pressure between the permanent magnet blocks and the convex tooth electromagnets.
Assuming that the facing area between all the convex tooth electromagnets and each group of electromagnets in each strand slot path is S, and the magnetic field on the surface of the magnetic pole is uniformly distributed, the magnetic levitation force between the pole facesF m Comprises the following steps:
F m =B 2 S/(2μ 0)
wherein,Bis the air gap flux density of the magnetic pole surface,μ 0is a vacuum magnetic permeability. Air gap flux densityBIn relation to the current, it needs to be generated by excitation.
In order to fully utilize the advantage of high magnetic permeability of ferromagnetic materials, a larger magnetic density is always selected during designBBy reducing
The volume and the weight of the electromagnet core are reduced.
On one hand, when the permanent magnet blocks are powered on, the permanent magnet blocks and the suspension electromagnet form a circuit magnetic flux 7 as shown in figure 6, so that the air gap flux density is enhancedBThereby enhancing the effect of lifting the main cable. On the other hand, after the power supply is stopped, the suspension lifting effect of the suspension electromagnet 4 disappears, and the permanent magnet blocks can keep constant magnetism, so that the main cable is enhancedThe vertical pressure of the cable 2 and the bottom surface of the saddle further increases the friction between the main cable and the bottom surface of the saddle.
The vertical pressure of the main cable strand 2 on the bottom surface of the saddle before electrification is assumed to bemgThe lifting force generated by the suspension electromagnet 4 to the main cable strand 2 after being electrified isF i The vertical pressure of the main cable strand 2 lifted by the suspension electromagnet on the bottom surface of the saddle after being electrified isF d =mg-F i . The invention can keep the static balance of the system and reduce the power consumption of the system, and the magnetic force provided by the electromagnet can keep the dynamic balance of the system.
Each permanent magnet block is connected with the convex tooth electromagnet positioned right below through an insulated free telescopic guide component 10.
The freely telescopic guide assembly preferably comprises an insulating sleeve, an insulating telescopic rod and a sliding limiting part. The insulating sleeve is vertically embedded in the convex tooth electromagnet, and the top surface of the insulating sleeve is not higher than that of the convex tooth electromagnet. The bottom end of the insulating telescopic rod is inserted into the insulating sleeve and is in sliding connection with the inner wall of the insulating sleeve, and the top end of the insulating telescopic rod is fixedly installed on the permanent magnet blocks.
The limiting part that slides carries on spacingly to the vertical displacement that slides of insulating telescopic link.
And a zinc filling block is arranged at the top of each strand groove and used for filling the strand groove space at the top of the main cable element strand.
A method for actively regulating and controlling lift force of a suspension bridge main cable-saddle in a sliding state comprises the following steps.
In this embodiment, the electromagnetic repulsion force only needs to be kept consistent with the self weight of the corresponding permanent magnet, so that the permanent magnet can be suspended. That is, the electromagnetic repulsion force should not be too large to prevent energy waste and burden on the freely retractable guide assembly.
When the main cable strand 2 starts to be seated in the saddle groove, the pressure of all the strands in the single groove to the bottom of the saddle is adjusted to be within the range of one eighth to one fifth of the self weight of the saddle according to a fuzzy pressure-bearing control algorithm in a main program embedded into a DSP controller. Namely: the second electromagnetic repulsion force between the vault permanent magnet blocks and the vault convex tooth electromagnets is preferably one eighth to one fifth of the dead weight of the corresponding cable strand.
A certain amount of friction force exists between the main cable and the bottom surface of the saddle in the process of erecting the main cable, and negative feedback regulation and control can be carried out according to the working state of a site subsequently.
The bottom surface of the saddle generates upward lifting force to the main cable strand 2 in each groove space according to the design requirement
Counteracting partial dead weight; according to the design and on-site construction requirements and the specific numerical value of the eddy current type pressure sensor 9, the multiplying power of the power amplifier 11 is adjusted, and the vertical pressure of the main cable strand 2 on the bottom surface of the saddle is controlledF d The friction between the main cable and the saddle is reduced, the relative sliding of the main cable of the suspension bridge relative to the saddle of the main tower is actively allowed, the complex design of pre-deviation of the saddle of the suspension bridge or the pre-deviation of the main tower is avoided, and the reasonable stress state of the main tower in the construction stage is ensured.
In the operation stage after the bridge is formed, the power supply of the electromagnetic permanent magnet mixed magnetic pole suspension electromagnet 4 is stopped, so that the strong friction force between the main cable and the bottom surface of the saddle is quickly and conveniently recovered, stable common stress and displacement are kept between the main cable and the saddle in the operation stage, and the structural stability and the safety of the suspension bridge in the operation stage are ensured.
The appearance and the structure of the active regulation lift device are consistent with those of a conventional suspension bridge saddle, and the conventional design of other components of the suspension bridge is not influenced.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (9)
1. The utility model provides a suspension bridge main push-towing rope-saddle slippage state initiative regulation and control lift device which characterized in that: comprises a suspension electromagnet, a clapboard and a permanent magnet;
the suspension electromagnet is embedded at the bottom of the saddle groove of the saddle;
the partition plates are uniformly arranged on the top of the suspension electromagnet along the transverse bridge direction, and a strand groove is formed between every two adjacent partition plates; the number of the cable strand groove ways in each saddle is equal to that of the cable strands in the corresponding main cable;
the suspension electromagnet positioned in each strand slot way is provided with a plurality of convex tooth electromagnets along the longitudinal bridge direction; the top surface of each convex tooth electromagnet is an arc-shaped surface, the connecting lines of the top surfaces of all the convex tooth electromagnets are arc-shaped arcs, and the shapes of the arc-shaped arcs are the same as those of the main cable after the convex tooth electromagnets are seated; the cross-sectional area of the convex tooth electromagnet is gradually reduced from the arch top of the arc arch to the arch bottoms at two sides;
a permanent magnet block with the cross section area matched with the convex tooth electromagnet is arranged above each convex tooth electromagnet, and all the permanent magnet blocks in each cable strand groove form a group of permanent magnets; the top surface connecting line of each group of permanent magnets is also an arched arc with the same shape as the main cable after sitting;
the main cable is placed on the top surface of the permanent magnet;
and the top surface of each permanent magnet block is provided with a pressure sensor.
2. The active regulation lift device of a main cable-saddle slip state of a suspension bridge according to claim 1, characterized in that: each permanent magnet block is connected with the convex tooth electromagnet positioned right below through an insulated free telescopic guide component.
3. The active regulation lift device of a main cable-saddle slip state of a suspension bridge of claim 2, characterized in that: the free telescopic guide assembly comprises an insulating sleeve and an insulating telescopic rod; the insulating sleeve is vertically embedded in the convex tooth electromagnet, and the top surface of the insulating sleeve is not higher than that of the convex tooth electromagnet; the bottom end of the insulating telescopic rod is inserted into the insulating sleeve and is connected with the inner wall of the insulating sleeve in a sliding manner; the top end of the insulating telescopic rod is fixedly arranged on the permanent magnet block.
4. The active regulation lift device of a main cable-saddle slip state of a suspension bridge according to claim 1, characterized in that: a coil placing groove is formed between the adjacent convex tooth electromagnets and is used for winding an electrified coil of the suspension electromagnet; the input end of the electrified coil is connected with the positive electrode of the power supply, and the output end of the electrified coil is sequentially connected with the power amplifier, the embedded DSP controller and the negative electrode of the power supply.
5. The active regulation lift device of a main cable-saddle slip state of a suspension bridge according to claim 1, characterized in that: and a zinc filling block is arranged at the top of each strand groove and used for filling the strand groove space at the top of the main cable element strand.
6. A method for actively regulating and controlling lift force of a suspension bridge main cable-saddle in a sliding state is characterized by comprising the following steps: the method comprises the following steps:
step 1, hoisting a main cable: hoisting a main cable of the suspension bridge to a position right above the corresponding saddle, and enabling each strand of the main cable to correspond to one strand groove way of the saddle;
step 2, permanent magnet suspension: the current introduced into the suspension electromagnet is I1The current of the permanent magnet is adjusted, so that the magnetic poles on the opposite sides of the convex tooth electromagnet and the permanent magnet are the same, and an electromagnetic repulsion force I is formed between the convex tooth electromagnet and the permanent magnet; under the action of the first electromagnetic repulsion force, each group of permanent magnets in each strand groove way are suspended upwards; in the suspension process, the free telescopic guide assembly extends, and guides and limits the vertical suspension of the permanent magnet; in each group of suspended permanent magnets, the permanent magnet blocks positioned at the arch top of the arch arc are called arch top permanent magnet blocks, the permanent magnet blocks positioned at the arch bottom of the arch arc are called arch bottom permanent magnet blocks, and the permanent magnet blocks positioned between the arch top and the arch bottom are called arch arc permanent magnet blocks; similarly, the convex tooth electromagnet positioned at the arch top of the arch is an arch top convex tooth electromagnet; the convex tooth electromagnets positioned at the two arch bottoms in the arch arc are arch bottom convex tooth electromagnets; the convex tooth electromagnet positioned between the arch crown and the arch bottom is an arc convex tooth electromagnet; the cross sectional area of the convex tooth electromagnet is matched with that of the permanent magnet block positioned right above, and the cross sectional area of the convex tooth electromagnet is gradually reduced from the arch top of the arc arch to the arch bottoms at two sides; therefore, the electromagnetic repulsion force I between the arch crown permanent magnet block and the arch crown convex tooth electromagnet and the electromagnetic repulsion force I between the arch bottom permanent magnet block and the arch bottom convex tooth electromagnet are gradually reduced;
step 3, contacting the cable strand with the vault permanent magnet block: the cable strand of the main cable is lifted by the lifting assembly, the height of the cable strand is lowered, and the cable strand is contacted with the upper surface of the suspended vault permanent magnet in the step 2; the pressure sensor arranged on the vault permanent magnet blocks monitors the contact pressure between the cable strand and the vault permanent magnet blocks in real time;
step 4, supporting the cable strand electromagnetically: when the contact pressure between the cable strand and the vault permanent magnet block is monitored to be greater than a set value, the current I introduced into the suspension electromagnet is detected1Increase to I2，I2＞I1An electromagnetic repulsion force II is formed between the convex tooth electromagnet and the permanent magnet block, and the electromagnetic repulsion force II is larger than the electromagnetic repulsion force I but smaller than the weight of the cable strand; the height of the main cable continues to fall, and part of the weight of the cable strand is supported by an electromagnetic repulsion force II between the vault permanent magnet iron block and the vault convex tooth electromagnet;
step 5, contacting the cable strand with the arched permanent magnet block: the height of the main cable is continuously reduced, and the cable strand is contacted with the upper surface of the suspended arched permanent magnet in the step 2; meanwhile, part of the weight of the cable strand is supported by a second electromagnetic repulsion force between the vault permanent magnet block and the vault convex tooth electromagnet and a second electromagnetic repulsion force between the arch permanent magnet block and the arch convex tooth electromagnet;
step 6, contacting the cable strand with the arch bottom permanent magnet block: the height of the main cable is continuously reduced, and the cable strand is contacted with the upper surface of the arch bottom permanent magnet block suspended in the step 2; the pressure sensor arranged on the arch bottom permanent magnet block monitors the contact pressure between the cable strand and the arch bottom permanent magnet block in real time;
step 7, seating of the cable strand: when the contact pressure between the cable strand and the arch bottom permanent magnet block is monitored to be larger than a set value, the hoisting assembly releases the hoisting between the hoisting assembly and the main cable, and the main cable is seated; in the main cable seating process, an electromagnetic repulsion force II between the arch crown permanent magnet block and the arch crown convex tooth electromagnet, and an electromagnetic repulsion force II between the arch bottom permanent magnet block and the arch bottom convex tooth electromagnet are all kept for electromagnetically supporting the cable strands;
step 8, removing the electromagnetic support: when the contact pressure monitored by each pressure sensor is kept constant, the suspension electromagnet is powered off, and the contact electromagnetic repulsion supports the cable strand; the cable strand is tightly pressed on the top of the permanent magnet block, the bottom of the permanent magnet block is tightly attached to the top of the convex tooth electromagnet, and the weight of the cable strand is supported by the saddle.
7. The method for actively regulating lift force of a suspension bridge main cable-saddle slip state according to claim 6, characterized in that: further comprises the step 9 of filling zinc filling blocks: and a zinc filling block is filled in the cable strand groove way at the top of each cable strand, and two top side walls of the cable saddle are fixed.
8. The method for actively regulating lift force of a suspension bridge main cable-saddle slip state according to claim 6, characterized in that: in the step 5, the electromagnetic repulsion force two between the vault permanent magnet blocks and the vault convex tooth electromagnets is one eighth to one fifth of the self weight of the corresponding cable strand.
9. The method for actively regulating lift force of a suspension bridge main cable-saddle slip state according to claim 6, characterized in that: in the step 2, the cross-sectional area of the arch crown convex tooth electromagnet is twice that of the arch bottom convex tooth electromagnet.
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| CN114032766B (en) * | 2021-11-16 | 2023-12-05 | 中铁广州工程局集团有限公司 | Upper-lower split pendulum shaft type cable saddle and installation method thereof |
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| JP2709279B2 (en) * | 1994-12-17 | 1998-02-04 | 住友電気工業株式会社 | Saddle structure for cable-stayed cable on main tower side of cable-stayed bridge |
| CN100357523C (en) * | 2005-01-26 | 2007-12-26 | 徐国彬 | Rotation displacement type cable saddle |
| CN2915811Y (en) * | 2006-06-29 | 2007-06-27 | 天津市科信新技术开发应用公司 | Plane line contact superpower electric permanent magnetic crane for steel pipe |
| CN101544337A (en) * | 2009-04-14 | 2009-09-30 | 岳阳鸿升电磁科技有限公司 | Electric-controlled permanent magnetic chuck |
| JP2011162942A (en) * | 2010-02-04 | 2011-08-25 | Sumitomo Denko Steel Wire Kk | Saddle structure and tension cable |
| CN203866706U (en) * | 2014-05-14 | 2014-10-08 | 柳州欧维姆机械股份有限公司 | Cable saddle of cable-stayed bridge |
| CN205347991U (en) * | 2016-01-29 | 2016-06-29 | 成都市新筑路桥机械股份有限公司 | Bridge main rope saddle with from recovery function |
| CN106906744B (en) * | 2017-03-02 | 2018-07-31 | 西南交通大学 | A kind of critical packaged type main cable saddle for main push-towing rope antiskid |
| CN206859083U (en) * | 2017-06-07 | 2018-01-09 | 中铁隧道集团二处有限公司 | Steering cable saddle for bridge construction |
| CN108221667A (en) * | 2017-12-29 | 2018-06-29 | 中铁大桥局集团第八工程有限公司 | Slip self-balancing cable saddle system |
| CN207920125U (en) * | 2018-02-11 | 2018-09-28 | 石美秀 | A kind of main cable strand protects structure temporarily |
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