CN103993558A - Main cable anti-slip device, anti-slip saddle and anti-slip cable clamp - Google Patents
Main cable anti-slip device, anti-slip saddle and anti-slip cable clamp Download PDFInfo
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- CN103993558A CN103993558A CN201410263239.8A CN201410263239A CN103993558A CN 103993558 A CN103993558 A CN 103993558A CN 201410263239 A CN201410263239 A CN 201410263239A CN 103993558 A CN103993558 A CN 103993558A
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- 239000000463 material Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 4
- 238000013459 approach Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 210000000689 upper leg Anatomy 0.000 description 3
- 241000108463 Hygrophila <snail> Species 0.000 description 2
- 229910000635 Spelter Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
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- 210000002435 tendon Anatomy 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention relates to a main cable anti-slip device, an anti-slip saddle and an anti-slip cable clamp. Anti-slip check and calculation between a main cable and the cable clamp and between the main cable and the saddle are important design content of a suspension bridge. A method that friction faces connected with the cable clamp or the saddle are increased between main cable wire strands penetrating through the cable clamp or the saddle is adopted, friction force is generated through radial force or clamping force transmitted between the main cable wire strands, and accordingly anti-slip performance between the cable clamp and the main cable and between the saddle and the main clamp is improved. By means of a reliable friction force anti-slip principle, anti-slip capacity is improved under the condition that extra pressure does not need to be applied, meanwhile, the situation that local stress of the main cable is increased or fatigue strength is reduced cannot be caused, the stress situation of a saddle groove wall can be improved, and the main cable wire strands in the saddle and the cable clamp are stressed more uniformly. The anti-slip capacity of the main cable in the saddle can be multiplied, and the cable clamp is shortened by 1/3. The principle is reliable, the structure is simple, construction is convenient to carry out, cost is low and practical value is achieved.
Description
Technical field
The present invention relates to saddle and the cord clip of suspension bridge, be particularly a kind ofly used for strengthening saddle or cord clip with the device of anti-slide performance between main push-towing rope thread in it.
Background technology
In recent years, developed in China across three tower suspension bridge technology greatly.Under unsymmetrical load effect, in this suspension bridge, the main push-towing rope axle power of tower top saddle both sides is poor larger, and the antiskid technology between main push-towing rope and saddle faces the challenge.
Main push-towing rope is generally closely integrated by some zinc coated high strength steel silks, zinc coated high strength steel silk rope, zinc coated high strength steel twisted wire, and saddle is the connector of main push-towing rope and bridge tower pier, and cord clip is the connector of main push-towing rope and hoist cable.Near the axle power of main push-towing rope saddle both sides there are differences, and makes main push-towing rope and saddle contact surface have tangential sliding force.The hoist cable of suspension bridge generally arranges along vertical in bridge facade, and except being positioned at a minimum point place across main push-towing rope, cord clip place hoist cable axle power, along the general non-zero of the tangential component of main push-towing rope, makes main push-towing rope and cord clip contact surface have tangential sliding force.
Tangential sliding force makes main push-towing rope with having tendency toward sliding between saddle or cord clip, and the general frictional force producing on contact surface that adopts of prior art is carried out antiskid.Main push-towing rope is metal material with the contact medium of saddle or cord clip, is suitable for adhesion-ditch dug with a plow frictional theory, generally in engineering practice adopts the very accurate but Coulomb friction theory of more convenient use.
According to Coulomb friction theory, on contact surface, produce a necessary condition of frictional force, be on contact surface, to have pressure.Because main rope of suspension bridge is suspended on king-tower by saddle, main push-towing rope turns at saddle place, causes having huge pressure on main push-towing rope and saddle contact surface.On main push-towing rope and cord clip contact surface, although there is not this structure pressure, but prior art is by applying pulling force to cross section cord clip wall in the form of a ring, make looped cables double wall there is the trend that reduces internal diameter, main push-towing rope in the inner of position has stoped looped cables double wall to reduce the trend of internal diameter, makes to have pressure on the contact surface of main push-towing rope and cord clip.
According to Coulomb friction theory, the friction factor that improves contact surface is an approach that strengthens anti-slide performance.But in engineering practice, because main push-towing rope thread in saddle groove is under the high contact stress condition of normal direction, axial fatigue intensity is to contact surface medium sensitivity, saddle saddle groove and cord clip generally adopt cast steel, the contact surface of itself and main push-towing rope need be made hot spray painted zinc (aluminium) and process, and hot spray painted zinc (aluminium) build is generally not less than 200um.Known according to adhesion-ditch dug with a plow frictional theory, under the condition of material that does not change contact surface medium, it is very difficult wanting to improve contact surface friction factor.
In existing saddle technology, saddle generally comprises and holds cable groove, saddle body, base plate, sliding panel and base.Main push-towing rope passes through from hold cable groove, holds cable groove and is connected with saddle body, and saddle body is connected with base plate, and sliding panel is between base plate and base, and base is connected in pier top of tower.The effect of sliding panel is in constructability process, to implement the pre-inclined to one side and incremental launching construction of saddle, after pushing tow, generally saddle base plate and tower top base is connected.The cross section that holds cable groove generally takes the shape of the letter U, and comprises bottom and sidewall.Hold cable trench bottom and can be provided with the tank circuit that central low both sides are high, be stairstepping, better to adapt to cable shape.Enter saddle for the ease of the shaping of main push-towing rope thread, hold cable groove and also can comprise vertical baffle, each vertical baffle is divided into again vertical stacked some, to facilitate main push-towing rope thread successively to enter from top to bottom saddle.In prior art, after treating that main push-towing rope thread sets up, generally also in saddle groove, above main push-towing rope thread, insert spelter, zine plate is pressed in spelter top, and with screw rod, U-shaped is held to cable groove side wall upper part to drawing above zine plate, hold the stress of cable groove sidewall and increase main push-towing rope thread with the pressure on saddle bottom land contact surface to improve.
In existing saddle technology, the skid resistance between main push-towing rope and saddle is generally provided by following two frictional force: the one, hold the frictional force between cable trench bottom and main push-towing rope; The 2nd, hold the frictional force between cable groove sidewall and vertical baffle and main push-towing rope.The pressure acting on saddle bottom land and main push-towing rope contact surface is main push-towing rope radial load; Acting on the pressure holding on cable groove sidewall and vertical baffle and main push-towing rope contact surface is main push-towing rope thread lateral force.Consider that, for main push-towing rope radial load, main push-towing rope thread lateral force is very little; Therefore the anti-slide performance that aforementioned Section 2 frictional force provides is very little, it is generally acknowledged that the skid resistance overwhelming majority between main push-towing rope and saddle is to be provided by aforementioned Section 1 frictional force, to such an extent as to China's existing " highway suspension bridge design specifications " is in the time carrying out in saddle groove main push-towing rope antiskid checking computations, has ignored the anti-slide performance that thread lateral forces causes.
A defect of existing saddle technology is that main push-towing rope radial load only produces antiskid frictional force on the contact surface of main push-towing rope and saddle bottom land.The present invention, by increase the method for the quantity of effective rubbing surface between saddle and main push-towing rope with a kind of friction skidding device, makes main push-towing rope radial load can on multiple contact surfaces, produce antiskid frictional force, thereby saddle anti-slide performance is improved significantly.
In existing cord clip technology, cord clip generally adopts two-piece type, and two semicircle annular cord clip walls are involutory in main push-towing rope periphery, and connect by screw rod, by applying pulling force to screw rod, make cord clip wall reduce internal diameter because of tension, thereby firmly hold the main push-towing rope passing through from cord clip.For making cord clip and main push-towing rope contact surface fully closely connected, cord clip wall generally adopts the cast steel material that elongation per unit length is high, simultaneously can fully be out of shape to adapt to cable shape when allowing cord clip wall tension, cord clip wall thickness can not be too large, this has limited the ability that bears of the cord clip wall of unit length, the connecting screw rod of two cord clips, generally along the single arrangement of main push-towing rope axis direction, makes cord clip larger along the axial length of main push-towing rope.
In existing cord clip technology, the skid resistance between main push-towing rope and cord clip is provided by the frictional force on its contact surface.Skid resistance size is directly proportional to interface pressure, but interface pressure can cause main push-towing rope porosity to reduce, too high for preventing cord clip exit main push-towing rope thread local stress, generally the main push-towing rope thread porosity difference inside and outside cord clip is limited in 2%, visible interface pressure can not arbitrarily improve.Therefore,, according to prior art, the main method that increases cord clip skid resistance is exactly to increase the length of cord clip along main push-towing rope.
A defect of existing cord clip technology is, only has the frictional force on cord clip inwall and this contact surface of main push-towing rope outer rim that anti-slide performance can be provided, and causes cord clip longer.The cord clip the present invention relates to is by using a kind of friction skidding device to increase the contact surface of cord clip and main push-towing rope, in the situation that not changing cord clip thickness and screw rod clamping force and contact surface material, cord clip anti-slide performance is got a promotion, thereby can suitably reduce cord clip length.
Summary of the invention
The technical issues that need to address of the present invention are problems that the anti-slide performance between main push-towing rope and saddle or cord clip is low.The present invention proposes a kind of effective rubbing surface that increases between main push-towing rope thread, utilize main push-towing rope radial load or the cord clip clamping force originally between main push-towing rope thread, transmitted to obtain antiskid frictional force as pressure, thereby strengthen the method for anti-slide performance between main push-towing rope and saddle and cord clip, a kind of friction skidding device that simultaneously provides the method to relate to, this device can be guaranteed the relative sliding trend of rubbing surface and main push-towing rope, consistent with the relative sliding trend of main push-towing rope with saddle or cord clip, and the antiskid frictional force obtaining on this device is passed to neighbouring cord clip or saddle reliably, a kind of antiskid saddle and the cord clip that use this device are finally provided, thereby solve the lower problem of anti-slide performance between main push-towing rope and saddle or cord clip.
For this reason, concrete solution is:
A kind of method that strengthens the anti-slide performance between main rope of suspension bridge and cord clip or saddle, this main push-towing rope is made up of multiply thread, main push-towing rope is suspended on Sarasota top by saddle, this saddle comprises saddle groove, main push-towing rope from saddle groove by and turn to, saddle bottom land is bearing main push-towing rope and is turning to the radial load of generation, in the time that near main push-towing rope axle power saddle both sides is unequal, main push-towing rope has the trend of sliding with respect to saddle, produce the frictional force that prevents that main push-towing rope from sliding in saddle groove bottom, the hoist cable of supporting girder of suspension bridge is connected with main push-towing rope by cord clip, this cord clip comprises two involutory cord clip walls, on the contact surface of cord clip wall and the main push-towing rope therefrom passing through, there is clamping force, in the time that hoist cable axle power is non-vanishing along the tangential component of main push-towing rope, cord clip has the trend of sliding with respect to main push-towing rope, main push-towing rope surface in cord clip produces the frictional force that prevents that cord clip from sliding, the saddle groove bottom contacting with main push-towing rope and cord clip inwall are process hot spray painted zinc (aluminium) surface-treated metal material, it is characterized in that: between the main push-towing rope thread in saddle or cord clip, increase rubbing surface, make rubbing surface bear radial load or the clamping force originally between main push-towing rope thread, transmitted, the rubbing surface increasing adopts with saddle or cord clip material and the surfacing similar to the contact surface of main push-towing rope, makes it substantially identical with the friction factor between saddle or cord clip and main push-towing rope with the friction factor of main push-towing rope contact surface, the rubbing surface increasing is connected with saddle or cord clip, this connection should be guaranteed along in main push-towing rope tangential direction, the rubbing surface increasing has identical movement tendency with saddle or cord clip, so that the tendency toward sliding between the rubbing surface of main push-towing rope and increase is consistent with the tendency toward sliding between main push-towing rope and saddle or cord clip.
A kind of main push-towing rope friction skidding device, for main rope of suspension bridge and cord clip, the connection of the members such as saddle, this main push-towing rope is made up of some threads, be suspended in Suspension Bridge Tower by saddle, this saddle comprises saddle groove, main push-towing rope passes through saddle from saddle groove, described cord clip is the connector of sling of suspension bridge and main push-towing rope, comprise two involutory cord clip walls, main push-towing rope passes through and contacts with cord clip wall medial surface from cord clip, process through hot spray painted zinc (aluminium) on the surface that described saddle groove or cord clip wall contact with main push-towing rope, it is characterized in that, comprise friction zone 1, bonding pad first 2 and bonding pad second 3(are referring to Fig. 1), described friction zone is positioned at main push-towing rope cross section and contacts with main push-towing rope thread, described bonding pad first and bonding pad second are positioned at that main push-towing rope cross section is outer to be connected with friction zone and saddle or cord clip member, friction zone is between bonding pad first and bonding pad second, the surface employing that friction zone contacts with thread and saddle or cord clip are with the similar material of main push-towing rope contact surface and surfacing.
According to above-mentioned a kind of main push-towing rope friction skidding device, it is characterized in that described friction zone 1 comprises that a tabular main friction member 4 and some rib shape friction member 5(are referring to Fig. 2), described sub-friction member comprises at least two surfaces that contact with main push-towing rope thread, and be connected with main friction member, the surface that its neutron friction member contacts with main push-towing rope thread, employing and saddle or cord clip are with the similar material of main push-towing rope contact surface and surfacing.
According to above-mentioned a kind of main push-towing rope friction skidding device, it is characterized in that, also comprise that thread locating part 6(is referring to Fig. 3), described thread locating part only includes a surface contacting with main push-towing rope thread, and near described bonding pad first or bonding pad second and junction, friction zone, be connected with friction zone or bonding pad first or bonding pad second, the surface employing that wherein thread locating part contacts with main push-towing rope thread and saddle or cord clip are with the similar material of main push-towing rope contact surface and surfacing.
A kind of main push-towing rope saddle, comprise saddle body and saddle groove, this saddle groove comprises that saddle bottom land 21 and saddle cell wall 22(are referring to Fig. 4), saddle bottom land can comprise the stepped tank circuit, saddle bottom land and saddle cell wall form the groove in U-shaped cross section, and main rope of suspension bridge is by also turning to from groove, and main push-towing rope surface contacts with saddle bottom land, it is characterized in that, also comprise between some main push-towing rope threads in saddle groove by and be connected with saddle cell wall according to above-mentioned main push-towing rope friction skidding device 23.
According to above-mentioned a kind of saddle (referring to Fig. 4), it is characterized in that, described saddle cell wall inner side also comprises connection rib 41, and described main push-towing rope friction skidding device is connected with saddle cell wall by connection rib, and saddle cell wall does not directly contact with main push-towing rope surface.
According to above-mentioned a kind of saddle (referring to Fig. 4), it is characterized in that, in the space that does not have main push-towing rope thread to pass through, also comprise filler 25 in saddle groove, in the direction of the main friction member perpendicular to main push-towing rope friction skidding device and main push-towing rope thread contact surface, the modulus of deformation of described filler is less than the modulus of deformation that is positioned at the main push-towing rope thread between main push-towing rope friction skidding device and saddle bottom land.
According to above-mentioned a kind of saddle, it is characterized in that, comprise the main push-towing rope friction skidding device 23 using in parallel, also comprise that compressor bar 36(is referring to Fig. 4), main push-towing rope friction skidding device 23 comprises main friction member 31, sub-friction member 32, adjacent main push-towing rope friction skidding device is connected with compressor bar 36 by main push-towing rope thread, and in the direction perpendicular to main friction member and main push-towing rope thread contact surface, the modulus of deformation of compressor bar is less than the modulus of deformation of the main push-towing rope thread between adjacent main push-towing rope friction skidding device.
A kind of cord clip, it is the linkage of main rope of suspension bridge and hoist cable, comprise that two are combined the cord clip wall 16 that connects with screw rod 18,17(referring to Fig. 5), characterized by further comprising between main push-towing rope thread in cord clip by, near two cord clip wall apposition positions, be connected with cord clip wall according to above-mentioned main push-towing rope friction skidding device 11.
The advantage that solution of the present invention has is: can significantly strengthen reliably the anti-slide performance between main push-towing rope and saddle or cord clip.Be embodied in the following aspects:
The one, antiskid principle is reliable.The present invention has continued to use friction antiskid principle of the prior art, and modern suspension practice has proved to rub antiskid principle not only effectively but also reliable.In the present invention, the material and the surfacing that directly contact friction skidding device surface, saddle groove bottom or cord clip wall medial surface with main push-towing rope thread are unanimous on the whole, and these rubbing surfaces have roughly the same friction factor; Friction skidding device is connected with saddle cell wall or cord clip wall, can transmit along the power of main push-towing rope axis direction, and main push-towing rope thread is consistent with respect to the direction of the relative sliding trend of friction skidding device, saddle cell wall or cord clip wall, and the direction of frictional force is consistent.In existing saddle technology, the radial load that superposed main push-towing rope thread produces, by being positioned at the main push-towing rope thread transmission of bottom, is located on the radial load stack of the main push-towing rope thread generation of bottom, is finally applied on saddle groove bottom land; In existing cord clip technology, act on the lip-deep cord clip clamping force of circular cross-section main push-towing rope, cancel each other to maintain the stress balance state of main push-towing rope thread in cord clip by the transmission of main push-towing rope thread, be to go up in any direction and all have pressure between the inner thread of main push-towing rope, the intensity of this pressure is consistent with the intensity of the cord clip clamping force between main push-towing rope surface and cord clip wall medial surface.In the present invention, friction skidding device passes through between main push-towing rope thread, there are two surfaces all to contact with main push-towing rope thread, and participate in the transmittance process of saddle place main push-towing rope radial load, cord clip place cord clip clamping force, on two surfaces that contact with main push-towing rope thread at friction skidding device, all bear the pressure that main push-towing rope radial load or cord clip clamping force produce, thereby increasing dexterously the summation of the pressure on the whole contact surfaces that act on antiskid cord clip and main push-towing rope thread, realizing the lifting of antiskid frictional force.
The 2nd, anti-slide performance significantly promotes.In the saddle the present invention relates to, although it is smaller than bottom land to act on the lip-deep radial pressure of friction skidding device being positioned between the main push-towing rope thread of bottom land top, but these friction skidding devices all has pressure on two surfaces up and down, can produce antiskid frictional force, consider this friction skidding device of arranging multiplayer simultaneously, act on the pressure summation on the whole rubbing surfaces that contact with main push-towing rope thread in saddle groove, can far exceed prior art radial load and only be directly delivered to the pressure that bottom land produces, anti-slide performance can promote several times.In the cord clip the present invention relates to, be placed in the friction skidding device between main push-towing rope thread in cord clip and have two surfaces that can produce frictional force, act on the intensity of these lip-deep pressure, identical with the pressure intensity between cord clip wall and main push-towing rope surface, the width of considering friction skidding device is roughly the main push-towing rope diameter in cord clip, and anti-slide performance can promote approximately 60%.
The 3rd, do not affect main push-towing rope fatigue strength.Main push-towing rope thread and friction skidding device are with similar to the material medium of the contact surface of saddle bottom land or cord clip wall, due to the contact stress between the friction skidding device newly increasing and main push-towing rope thread, be no more than the contact stress between saddle bottom land or cord clip wall and main push-towing rope thread, the latter that remains who controls main push-towing rope fatigue strength, the present invention can not have influence on main push-towing rope fatigue strength.
The 4th, the stressed uniformity coefficient of the main push-towing rope thread in saddle groove or cord clip is greatly improved.In prior art, the internal friction between main push-towing rope thread is the factor that prevents those main push-towing rope threads slips that directly do not contact with saddle or cord clip.A consequence of this principle by the antiskid that rubs in thread is, the main push-towing rope thread that distance and saddle or cord clip and main push-towing rope contact surface are far away, can occur along the axial moderate finite deformation of main push-towing rope, this distortion has cumulative situation, the thread far away apart from contact surface, the distortion occurring is more remarkable, therefore the stressed uniformity coefficient of main push-towing rope thread is not very good.The present invention has increased the friction skidding device being connected with saddle groove or cord clip in saddle groove or cord clip between main push-towing rope thread, significantly reduced the maximum value of main push-towing rope thread to rubbing surface distance, and the stressed uniformity coefficient of main push-towing rope thread in saddle groove is greatly improved.
The 5th, for saddle, can improve the force-bearing situation of saddle cell wall, to such an extent as to without improving its force-bearing situation by Screw arbor with nut at both-ends being set on cell wall top again.Saddle cell wall in the present invention can not contact with main push-towing rope thread, main push-towing rope thread lateral force no longer acts on saddle groove cell wall, but act on the thread locating part of friction skidding device, the main push-towing rope thread lateral force acting on the thread locating part of friction skidding device both sides can be cancelled each other, can not be delivered on cell wall, therefore the force-bearing situation of cell wall improves greatly.
The 5th, with low cost.The friction skidding device the present invention relates to, the plate that main member is exactly that a middle part is embedded in main push-towing rope substantially, both sides are connected with saddle or cord clip respectively, constructs very simple; Can piecemeal manufacture, can use by series and parallel connections, be convenient to standardization to save manufacturing cost.Described series connection is used and refers to along main push-towing rope axis piecemeal; Described in parallel use refers to along main push-towing rope vertical line piecemeal.When multiple main push-towing rope friction skidding devices that serial or parallel connection uses and same cord clip or saddle are connected, these friction skidding devices bear along all skid resistances of visual cord clip for this reason or saddle of the tangential frictional force of main push-towing rope.In the time that series connection is used, by increasing necessary construction measure, making pressure on rubbing surface is that main push-towing rope thread by having relative sliding trend transmits, instead of transmits by the member that does not possess relative sliding trend.
Brief description of the drawings
Fig. 1: a kind of cable friction skidding device schematic diagram the present invention relates to;
Fig. 2: a kind of cable friction skidding device schematic diagram that comprises sub-friction member the present invention relates to;
Fig. 3: a kind of cable friction skidding device schematic diagram that comprises cable thread locating part the present invention relates to;
Fig. 4: the saddlebow structure of a kind of antiskid saddle the present invention relates to and with main push-towing rope connection diagram;
Fig. 5: a kind of antiskid cord clip schematic diagram the present invention relates to.
Wherein, 1---friction zone, 2---bonding pad first, 3---bonding pad second, 4---main friction member, 5---sub-friction member, 6---thread locating part, 11---main push-towing rope friction skidding device, 12---bonding pad first, 13---bonding pad second, 14---friction-type bolt, 15---screw rod passes through hole, 16---cord clip wall first, 17---cord clip wall second, 18---screw rod, 21---saddle bottom land, 22---saddle cell wall, 23---main push-towing rope friction skidding device, 24---main push-towing rope thread, 25---filler, 30---main push-towing rope thread, 31---main friction member, 32---sub-friction member, 33---thread locating part, 34---stiffening rib, 36---compressor bar, 41---connection rib, 42---weld seam.
Detailed description of the invention
In appended figure, with a kind of non-limiting method, a kind of cable friction skidding device the present invention relates to is described, and has applied to an embodiment of main push-towing rope saddle and cord clip.
A kind of cable friction skidding device (referring to Fig. 1), comprises friction zone 1, bonding pad first 2 and bonding pad second 3; Dotted line wherein represents the border of main push-towing rope profile, and this main push-towing rope is made up of some Prefabricated parallel steel tendon thighs, and main push-towing rope profile refers to the convex closure of the intersection point of the normal plane of thread axis that main push-towing rope comprises and main push-towing rope axis; Friction skidding device passes through from main push-towing rope cross section middle part, and described friction zone is positioned at main push-towing rope, with main push-towing rope thread close contact; Friction zone is between bonding pad first and bonding pad second and be attached thereto and connect; Bonding pad first is connected with near cord clip by friction-type bolt with bonding pad second.This device friction zone is circular-arc and comprises gradient thickness section along two axial ends of main push-towing rope, has circular arc chamfering on sideline, to avoid main push-towing rope thread to produce the local stress that exceedes cord clip exit at this place.Hot spray painted zinc processing is done on the surface, friction zone of this device, to prevent that main push-towing rope fatigue strength from reducing.
A kind of cable friction skidding device (referring to Fig. 2), with the difference of aforementioned cable friction skidding device (referring to Fig. 1) is: its friction zone comprises main friction member 4 and sub-friction member 5; Wherein main friction member 4 is similar to the friction zone 1 of aforementioned cable friction skidding device; Described sub-friction member 5 is positioned at cable cross section, comprise at least two with the surface of main push-towing rope thread close contact, and be connected with described main friction member 4 by weld seam.
A kind of main push-towing rope friction skidding device (referring to Fig. 3), with the difference of aforementioned cable friction skidding device (referring to Fig. 2) is: also comprise thread locating part 6; This thread locating part is positioned near bonding pad first or bonding pad second and main friction member connection, and is attached thereto and connects, it only have one with the surface of main push-towing rope thread close contact, play a part to prevent that cable thread is subject to lateral forces outwards mobile.This thread locating part is rib shape member, for preventing that it is because the generation of cable thread lateral forces is compared with macrobending distortion, on relative surface, same main push-towing rope thread close contact surface, is connected with some stiffening ribs.
A kind of saddle (referring to Fig. 4), comprises base plate, saddle body and has saddle bottom land 21 and the saddlebow of saddle cell wall 22, different with traditional saddle: it also comprises five layers of antiskid load transfer device 23; Each antiskid load transfer device 23 comprises axial plane and perpendicular some middle ribs 32 and the two limit ribs 33 of a perpendicular plate 31, axial plane and plate 31 axial planes of radial load direction; Middle rib 32 is connected with plate 31 by weld seam with limit rib 33; Main push-towing rope thread 30 close-packed arrays are in the rectangular channel being surrounded by middle rib 32, limit rib 33 and plate 31; Plate 31 stretches out limit rib 33 and forms bonding pad first and the bonding pad second of main push-towing rope friction skidding device, is welded to connect with saddle cell wall 22; Stiffening rib 34 is welded to connect with plate 31 and limit rib 33, prevents that limit rib 33 is outwardly-bent because bearing cable thread lateral force; For better adapting to the spread geometry of main push-towing rope thread, the high several tank circuits in low both sides in the middle of saddle bottom land is provided with, tank circuit junction is provided with shorter vertical baffle; The middle rib 32 of saddle bottom land vertical baffle and each layer of friction skidding device 23 and the top of limit rib 33, all be furnished with the compressor bar 36 of quality of rubber materials, the cable thread radial load that the plate 31 of friction skidding device can be born it, pass to the cable thread that is positioned at its below completely, instead of pass to the middle rib 32, limit rib 33 or the saddle bottom land vertical baffle that are positioned at its below; The gap that does not have main push-towing rope thread to pass through in saddle groove, is filled with block rubber 25.
Saddle bottom land 21, saddle cell wall 22 and not shown saddle base plate and saddle body are integral cast steel part, and the width of plate 31 is slightly less than saddle groove clear span, and saddle cell wall 22 inwalls are provided with boss 41, adjust stand out for saddle cell wall 22 with plate 31 while being connected; Aliging with the end face of boss 41 in the bottom surface of plate 31, is connected with saddle cell wall 22 by weld seam 42.The main push-towing rope passing through from saddle groove comprises 48 synnema thighs, has a branch of thread 30 therefrom to pass through in the each little square frame in figure medial saddle groove, and every synnema thigh 30 all comprises the zinc-coated wire (referring to Fig. 4 detail drawing A) of 137 diameter 5.1mm.Installation steps are as follows:
The first step: saddle base plate, saddle body and saddlebow are installed.Saddlebow comprises saddle bottom land 21 and saddle cell wall 22.The top surface side side weld of saddle bottom land 21 is connected to two limit ribs 33, between limit rib 33 outsides and saddle bottom land 21, is welded with stiffening rib 34; Saddle bottom land 21 is provided with the tank circuit, the tank circuit between be connected with vertical baffle, the upper and lower piecemeal of vertical baffle, the maximum height of vertical baffle, approaches three layers of whole height for square cable thread 30; The limit rib 33 being connected with saddle bottom land 21 and the top of vertical baffle, be all bonded with rubber strip 36.
Second step: three layers of (the 1st to 16) main push-towing rope thread 30 that approach saddle bottom land are installed, are filled the tank circuit between limit rib 33 and the vertical baffle being connected with saddle bottom land 21.The top that is bonded in the rubber strip of the vertical baffle that is connected with saddle bottom land and limit rib end face, exceeds mounted main push-towing rope thread end face slightly.
The 3rd step: filled rubber piece 25 in the gap between saddle bottom land 21 limit ribs and saddle cell wall 22, and first floor friction skidding device 23 is installed.Friction skidding device comprises plate 31, middle rib 32, limit rib 33 and stiffening rib 34; Wherein, the top of middle rib 32 and limit rib 33 is also bonded with rubber strip; Plate 31 outside limit rib 33 is provided with air vent.When installation, plate 31 sides are pressed in to boss 41 end faces on saddle cell wall 22 inwalls, the rubber strip at limit rib and vertical baffle top below slightly exerting pressure to compress it at plate 31 middle parts, plate 31 belows are contacted with cable thread, plate 31 sides and saddle cell wall 22 are welded (weld seam is referring to 42 of Fig. 4 detail drawing B);
The 4th step: the 4th layer of (the 17th to 24) the main push-towing rope thread that approaches saddle bottom land is installed, filled the tank circuit of first floor friction skidding device limit intercostal.
The 5th step: repeat the 3rd, the 4th step, until installation.
The main push-towing rope thread number passing through from the saddle shown in Fig. 4 is 48, is divided into up and down 8 layers, and every layer of thread number is respectively 2,6,8,8,8,8,6,2.If main push-towing rope axis bending radius is R, the average axle power of main push-towing rope is T, thread and each contact surface place friction factor are μ, ignore the difference of each layer of cable thread bend radius up and down, in the time that main push-towing rope and saddle occur slightly to slide, the frictional force that the radial load of a cables thread causes on contact surface is f=(μ T)/(48R); Ignore the frictional force producing due to main push-towing rope thread lateral force, the frictional force f between main push-towing rope thread and saddle bottom land contact surface
0=48f; Two surfaces up and down of friction skidding device all with main push-towing rope thread close contact, the pressure on contact surface is the radial load sum of its top thread, the frictional force between five layers of friction skidding device and cable thread is from bottom to up respectively f
1=2 × 32f, f
2=2 × 24f, f
3=2 × 16f, f
4=2 × 8f, f
5=2 × 2f; Because the direction of the tendency toward sliding between cable thread and saddle bottom land and each layer of friction skidding device is consistent, above every cumulative, be the anti-slide performance F=∑ f of this saddle
i=212f, wherein i ∈ [0,5].Visible, the anti-slide performance of this saddle, is the anti-slide performance F without the conventional saddle of friction skidding device
'=f
0(212f)/(48f)=442% of=48f, lifting amplitude reaches 332%.
Because anti-slide performance significantly improves, can cancel conventional saddle cable top in saddle groove and apply the complex measures of pressure on top surface.
A kind of cord clip (referring to Fig. 5) is to comprise on the basis of the conventional cord clip of two cord clip walls 16 and 17 up and down connecting by screw rod 18, adding an antiskid load transfer device 11 of the present invention; The bonding pad, left and right 12 of described antiskid load transfer device 11 is connected by friction-type bolt 14 with cord clip wall 16 and 17 respectively with 13.Wherein, on friction skidding device 11, there is screw rod by hole 15.
Its implementation step is:
The first step: cable thread is installed, is all installed until be positioned at the cable thread of friction skidding device 11 belows.
Second step: the part steel wire that is positioned at friction skidding device 11 tops in mounted cable thread is separated, put into friction skidding device 11, and screw rod by both sides by hole 15, walk around the cable of the installation thread of friction skidding device 11 belows, friction skidding device 11 is temporarily fixed on main push-towing rope with soft iron silk.
The 3rd step: continue cable thread is installed, install rear tight cable.
The 4th step: remove soft iron silk temporary fixed, install sheet cord clip 16 and lower cord clip 17, connecting screw rod 18.
The 5th step: continue bridge construction, when the cord clip anti-slide performance only being provided by the frictional force between cord clip wall and main push-towing rope before completing bridge construction or in next step operation does not possess enough safety factor, pass line double wall 16 and the 17 friction-type bolts 14 that are connected with friction skidding device 11.
Wherein, five steps also can be synchronizeed and carry out with the 4th step, while needing to adjust connecting screw rod 18 clamping force, also synchronously adjusts the torsion of friction-type bolt 14 in bridge construction process.
Get the cord clip of unit length, if the pulling force of cord clip wall is that the intensity of t, the pressure of cable thread surface to cord clip wall is p, the deflection of micro-section of s of cord clip wall is θ, main push-towing rope radius r, obtain t=-pr by the dynamic balance condition of cord clip wall 1/4 cross section, if pressure makes a concerted effort for N on a contact surface of friction skidding device and cable thread, dynamic balance condition by the cable of friction skidding device one side has N=-2t, if the friction factor between cable thread and cord clip wall and friction skidding device is μ, the frictional force F between main push-towing rope thread and cord clip wall
0=-2 π μ t, the frictional force F between contact surface of main push-towing rope thread and friction skidding device
1=μ N=-2 μ t, omits and represents the negative sign of opposite direction, and consider friction skidding device have two with the surface of cable thread close contact, and the size and Orientation of the frictional force producing on them is all identical, therefore the skid resistance of this cord clip of unit length total F=F
0+ F
1=2 (π+2) μ t, with the conventional cord clip anti-slide performance F without friction skidding device 11
'=F
0=2 π μ t compare, improved [2 (π+2) μ t]/(2 π μ t)-1=63.7%; In the situation that not changing cord clip factor of safety against sliding, cord clip length can reduce 1-(F
'/ F)=38.9%.
Claims (9)
1. one kind strengthens the method for anti-slide performance between main rope of suspension bridge and saddle or cord clip, this saddle is connected with Sarasota top, comprise the saddle groove with bottom land and cell wall, in the vertical facade of bridge, the upper surface of bottom land raises up, and this main push-towing rope is made up of multiply thread, from saddle groove, pass through, contact with the upper surface of saddle bottom land, this cord clip comprises two involutory cord clip walls, and main push-towing rope passes through and contacts with cord clip wall medial surface from cord clip; Wherein, on the contact surface on main push-towing rope surface with saddle groove or cord clip wall, there is pressure, can produce and there is the antiskid frictional force that prevents relative sliding effect; It is characterized in that: between the main push-towing rope thread in saddle groove, increase the rubbing surface parallel with saddle groove bottom, this rubbing surface is connected with saddle groove; Or increasing rubbing surface between the main push-towing rope thread in cord clip, this rubbing surface is connected with cord clip wall; Wherein, on the contact surface of increased rubbing surface and the inner thread of main push-towing rope, there is pressure, can produce and there is the antiskid frictional force that prevents relative sliding effect.
2. a main push-towing rope friction skidding device, for being connected of main rope of suspension bridge and the member such as cord clip, saddle; This main push-towing rope is made up of multiply thread, is suspended in Suspension Bridge Tower by saddle; This saddle comprises saddle groove, and main push-towing rope passes through saddle from saddle groove; This cord clip is the connector of sling of suspension bridge and main push-towing rope, comprises two involutory cord clip walls, and main push-towing rope passes through and contacts with cord clip wall medial surface from cord clip; It is characterized in that, comprise that friction zone 1, bonding pad first 2 and bonding pad second 3(are referring to Fig. 1), described friction zone is positioned at main push-towing rope cross section, and contact with main push-towing rope thread, described bonding pad first and bonding pad second are positioned at outside main push-towing rope cross section, and be connected with friction zone and saddle or cord clip member, friction zone is between bonding pad first and bonding pad second.
3. a kind of main push-towing rope friction skidding device according to claim 2, it is characterized in that described friction zone 1 comprises that a tabular main friction member 4 and some rib shape friction member 5(are referring to Fig. 2), described sub-friction member comprises at least two surfaces that contact with main push-towing rope thread, and is connected with main friction member.
4. according to claim 2 or a kind of main push-towing rope friction skidding device claimed in claim 3, it is characterized in that, also comprise that thread locating part 6(is referring to Fig. 3), described thread locating part only includes a surface contacting with main push-towing rope thread, and near described bonding pad first or bonding pad second and junction, friction zone, be connected with friction zone or bonding pad first or bonding pad second.
5. a main push-towing rope saddle, comprise saddle body and saddle groove, this saddle groove comprises that saddle bottom land 21 and saddle cell wall 22(are referring to Fig. 4), saddle bottom land can comprise the stepped tank circuit, saddle bottom land and saddle cell wall form the groove that is roughly U-shaped cross section, main rope of suspension bridge from groove by and turn to, main push-towing rope soffit contacts with saddle bottom land, it is characterized in that, also comprise between some main push-towing rope threads in saddle groove by and be connected with saddle groove according to claim 2 or claim 3 or main push-towing rope friction skidding device 23 claimed in claim 4.
6. a kind of saddle according to claim 5 (referring to Fig. 4), is characterized in that, described saddle cell wall inner side also comprises connection rib 41, and described main push-towing rope friction skidding device is connected with saddle cell wall by connection rib, and saddle cell wall does not directly contact with main push-towing rope surface.
7. a kind of saddle according to claim 6 (referring to Fig. 4), characterized by further comprising filler 25, this filler is in the space between saddle groove, main push-towing rope friction skidding device and main push-towing rope surface, in the direction of the main friction member perpendicular to main push-towing rope friction skidding device and main push-towing rope thread contact surface, the modulus of deformation of this filler is less than the modulus of deformation that is positioned at the main push-towing rope thread between main push-towing rope friction skidding device and saddle bottom land.
8. a kind of saddle according to claim 5, it is characterized in that, comprise the main push-towing rope friction skidding device 23 using in parallel, also comprise that compressor bar 36(is referring to Fig. 4), main push-towing rope friction skidding device 23 comprises main friction member 31, sub-friction member 32, adjacent main push-towing rope friction skidding device is connected with compressor bar 36 by main push-towing rope thread, and in the direction perpendicular to main friction member and main push-towing rope thread contact surface, the modulus of deformation of compressor bar is less than the modulus of deformation of the main push-towing rope thread between adjacent main push-towing rope friction skidding device.
9. a cord clip, it is the linkage of main rope of suspension bridge and hoist cable, comprise that two are combined the cord clip wall 16 that connects with screw rod 18,17(referring to Fig. 5), characterized by further comprising between main push-towing rope thread in cord clip by near, the main push-towing rope friction skidding device 11 according to claim 2 that is connected with cord clip wall two cord clip wall apposition positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263239.8A CN103993558A (en) | 2014-06-14 | 2014-06-14 | Main cable anti-slip device, anti-slip saddle and anti-slip cable clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263239.8A CN103993558A (en) | 2014-06-14 | 2014-06-14 | Main cable anti-slip device, anti-slip saddle and anti-slip cable clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103993558A true CN103993558A (en) | 2014-08-20 |
Family
ID=51307874
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410263239.8A Pending CN103993558A (en) | 2014-06-14 | 2014-06-14 | Main cable anti-slip device, anti-slip saddle and anti-slip cable clamp |
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| CN (1) | CN103993558A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107761566A (en) * | 2017-10-31 | 2018-03-06 | 上海浦江缆索股份有限公司 | Deep saddle groove under main rope of suspension bridge strand is constrained enters saddle device and its enters saddler's skill |
| CN108265627A (en) * | 2018-03-06 | 2018-07-10 | 江苏法尔胜缆索有限公司 | A kind of strand suitable for main rope of suspension bridge depth saddle slot enters saddle restraint device |
| CN111979914A (en) * | 2020-08-24 | 2020-11-24 | 郑州大学 | An efficient anti-skid cable clamp |
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| CN108265627A (en) * | 2018-03-06 | 2018-07-10 | 江苏法尔胜缆索有限公司 | A kind of strand suitable for main rope of suspension bridge depth saddle slot enters saddle restraint device |
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| CN111979914A (en) * | 2020-08-24 | 2020-11-24 | 郑州大学 | An efficient anti-skid cable clamp |
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Application publication date: 20140820 |