CN113818290A - Continuous support floating rail type fastener system - Google Patents
Continuous support floating rail type fastener system Download PDFInfo
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- CN113818290A CN113818290A CN202111386152.6A CN202111386152A CN113818290A CN 113818290 A CN113818290 A CN 113818290A CN 202111386152 A CN202111386152 A CN 202111386152A CN 113818290 A CN113818290 A CN 113818290A
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- rail
- block
- fastener system
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
- E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
- E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
- E01B9/306—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped plate
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/62—Rail fastenings incorporating resilient supports
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Abstract
The invention discloses a continuous supporting floating rail type fastener system, which relates to the technical field of railway tracks and comprises a supporting rubber block buckled and pressed at a rail waist, wherein a plurality of mass vulcanizing rods are arranged in the supporting rubber block, are parallel to the main stress direction of the supporting rubber block under transverse load and are perpendicular to the main stress direction of the supporting rubber block under vertical load; by adopting the scheme, the horizontal rigidity of the system can be improved under the condition of keeping lower vertical rigidity, the decoupling of the vertical horizontal rigidity is realized, and a good damping effect is kept.
Description
Technical Field
The invention relates to the technical field of railway tracks, in particular to a continuous supporting floating rail type fastener system.
Background
The fastener system is an important component of a railway track and is a coupling part for connecting a rail and a sleeper. The design should have sufficient buckling force and some resiliency to maintain the track geometry within a certain range, resist excessive longitudinal and lateral displacement of the rail, prevent the rail from tipping over, and also provide a suitable amount of resiliency. This will also reduce vibration and shock of the wheel rail system and transfer forces to the sleepers and the rail plate.
Urban rail transit fastener systems in China are generally divided into rail-bottom-supported and rail-waist-supported fastener systems. The traditional rail bottom supporting type fastener is mainly formed by assembling parts such as an elastic strip, an under-rail elastic base plate, an iron base plate, a spiral spike, an under-plate elastic base plate and the like, and the rail elasticity is mainly provided by the elastic strip and the base plate and can play a good supporting and limiting role; and traditional rail web supporting type fastener system mainly comprises parts such as rail web supporting rubber voussoir, supporting baffle, spring clamp, location voussoir, spiral spike and bed plate, and track elasticity is almost only determined by the rubber voussoir, and the rail jack-up after the rubber voussoir prepressing, rail end suspension, vertical displacement is great, and vertical rigidity is less, and the damping effect is better.
The rigidity of the rail bottom supporting type fastener system is provided by the elastic strip and the base plate, the large rigidity damping effect is poor, meanwhile, the effect of limiting the transverse displacement of the steel rail only by the elastic strip, the gauge block and the base plate is poor, the steel rail deflects excessively, the transverse displacement of the rail head is too large, and the dynamic gauge is difficult to keep in a good range. The rail web supporting type fastener system is small in rigidity and good in vibration reduction effect, but due to the fact that the rigidity coupling performance of all directions is strong, all the directions of rigidity are small, and dynamic displacement is large. Under the excitation of the wheel rail, the rail supporting mode between the point support and the continuous support causes strong randomness of wheel rail interaction, particularly non-uniformity of transverse support rigidity, and is easy to cause the wave grinding phenomenon of the steel rail with short wavelength in a curve section.
Disclosure of Invention
The invention aims to solve the technical problems that the randomness of the interaction of a wheel rail is high due to a rail supporting mode between point supporting and continuous supporting, particularly the nonuniformity of transverse supporting rigidity easily causes the wave grinding phenomenon of a short-wavelength steel rail in a curve segment, and aims to provide a continuous supporting floating rail type fastener system.
The invention is realized by the following technical scheme:
the utility model provides a support superficial rail formula fastener system in succession, is including withholding the support block rubber of putting in the rail web department, support block rubber inside is equipped with a plurality of qualities and vulcanizes the stick, the quality vulcanizes the main stress direction under the stick is on a parallel with support block rubber lateral load to the perpendicular to supports the main stress direction under the vertical load of block rubber.
Compared with the prior art, the vertical stiffness and the transverse stiffness of the floating rail type fastener system are basically provided by the compression, the shearing and the torsion of the supporting rubber block, the system only depends on the rubber quality to a great extent, the rigidity coupling performance of the system in all directions is strong, so that although the lower vertical displacement ensures the better vibration damping effect, the transverse stiffness is too low, the transverse vibration of the rail is severe under the transverse excitation action of the wheel rail, and the dynamic gauge holding capacity is poor; the scheme provides a continuous support floating rail type fastener system, and by adopting the scheme, the transverse rigidity of the system can be improved under the condition of keeping lower vertical rigidity, the decoupling of the vertical and transverse rigidity is realized, and a good damping effect is kept; specifically, this scheme is equipped with a plurality of qualities at the inside vulcanization stick that is equipped with of support block rubber, wherein the quality vulcanization stick is at the inside high quality pole of vulcanization of support block rubber, a plurality of qualities vulcanization stick multitrack support in succession, and it is on a parallel with the principal stress direction under the support block rubber lateral load, and the principal stress direction under the perpendicular to support block rubber vertical load, just can vulcanize the transverse rigidity who improves the system through the quality this moment, reduce the transverse vibration of track under the horizontal excitation of wheel rail, good shock attenuation effect has been reached.
Further optimizing, the mass vulcanizing rods are uniformly distributed along the length direction of the rail, multiple rows of mass vulcanizing rods are arranged in the supporting rubber block positioned on the inner side of the rail, the multiple rows of mass vulcanizing rods are vertically arranged along the rail, and the number of the rows is not less than 2; in order to improve the continuity of rigidity, in the scheme, a plurality of mass vulcanizing rods are uniformly distributed along the length direction of the track and can be arranged in a plurality of rows, the strength of the inner side of the track is more, so that the mass vulcanizing rods on the inner side need to be more than the mass vulcanizing rods on the outer side, the arrangement shown in the scheme is only one expression form, and the mass vulcanizing rods are only parallel to the main stress direction under the transverse load of the supporting rubber block and perpendicular to the main stress direction under the vertical load of the supporting rubber block, and how to arrange the mass vulcanizing rods on the number, the diameter and the length are all within the protection range of the scheme.
The track is characterized by further comprising a base plate, wherein two front side plates are arranged on the base plate, the two front side plates are respectively arranged on the inner side and the outer side of the track, the inner side surfaces of the front side plates are used for buckling and pressing a supporting rubber block on a track web, the outer side surfaces of the front side plates are provided with supporting parts, and the front side plates are supported on the base plate through the supporting parts; for will supporting the stable knot of block rubber and press in the rail web, in this scheme, all be equipped with preceding curb plate in the inside and outside both sides of track, the medial surface of preceding curb plate can with the stable laminating in surface of supporting the block rubber to detain its centre gripping and press on the rail web, on its lateral surface is fixed in the base through the landing leg, two preceding curb plates acted on in opposite directions, make the track suspend on the base plate.
Preferably, the two ends of the supporting part are provided with supporting legs, the front side plate is supported on the base plate through the supporting legs, the base plate is provided with a limiting boss, the limiting boss is provided with an upper cover plate, and the bottom of each supporting leg is provided with a pay-out section pressed by the upper cover plate; in order to facilitate disassembly, the two ends of the supporting part are provided with the supporting legs, the bottom of each supporting leg is provided with the expenditure sections, the two expenditure sections extend oppositely, and at the moment, the supporting legs can be pressed by the upper cover plate of the limiting boss on the base, so that rapid assembly and disassembly are realized, and the supporting legs are used for fixing the front side plate in the vertical direction; the position that base and expenditure section are connected is preferred the plane, when dismantling, only needs to pay out the section and slide into the upper cover plate below, can realize spacing fixed.
The positioning block is fixedly arranged on the base plate, a supporting surface is arranged between the two supporting legs, the positioning block abuts against the supporting surface through the adjusting block, a matched inclined surface is arranged between the adjusting block and the supporting surface, the inclined surface is arranged along the length direction of the track, the bottom of the inclined surface inclines towards the side far away from the track, and the adjusting block can move along the height direction of the positioning block; for realizing the stable support to preceding curb plate, in this scheme, still be equipped with the locating piece on the base, wherein locating piece and base integrated into one piece or detachable connection, the locating piece side supports the holding surface through the regulating block, wherein is swing joint between locating piece and the regulating block: the adjusting block can move along the height direction of the positioning block, a matched inclined plane is arranged between the adjusting block and the supporting surface, and at the moment, the front side plate can be compressed only by adjusting the upper position and the lower position of the adjusting block and is used for transversely fixing the front side plate; and wherein the inclined plane sets up along track length direction, and the bottom inclines towards the party of keeping away from the track for make things convenient for dismouting regulating block, realize the horizontal ascending fixed of preceding curb plate fast.
Preferably, the adjusting block is provided with a through groove, the through groove is used for clamping two sides of the positioning block, and a first sawtooth surface matched with the bottom side of the through groove is arranged between the bottom side of the through groove and the positioning block; for the removal of restriction regulating block, in this scheme, along the locating piece direction of height, it has logical groove to open on the regulating block, leads to the groove both sides and can be with including the locating piece centre gripping, makes the regulating block can stabilize and remove along the locating piece direction of height, and has the first sawtooth surface of matched with between leading to groove bottom side and locating piece for after the regulating block realizes fixing on the preceding curb plate is horizontal, restriction regulating block is at the ascending removal of locating piece direction of height.
The spring clamp comprises a front side plate, a positioning block and an adjusting block, wherein the front side plate is provided with a front end and a rear end; in order to prevent the elastic element from being damaged due to overlong service time under the condition of no maintenance, in the scheme, the spring clamp is arranged, namely the locking elastic strip is arranged, the spring clamp is made of spring steel and painted to be bright in color so as to identify and check the state of the spring clamp, the front side plate, the positioning block and the adjusting block can be clamped in the spring clamp, when the fastener operates normally and the state is good, the spring clamps do not play any role, and the front side plate is positioned at the proper position of the shoulder through the pressure effect of the supporting rubber block. The purpose of the spring clamp is to prevent the supporting rubber block from being damaged due to overlong service time under the condition of no maintenance, and the spring clamp prevents the front side plate from moving relative to the retaining shoulder, so that the supporting side plate cannot move outwards to cause the increase of the track gauge.
Preferably, one chuck of the spring clamp penetrates through the inclined plane on the supporting surface, an open slot is formed in one side, away from the adjusting block, of the positioning block, and the other chuck of the spring clamp extends into the open slot; in this scheme, the vertical logical groove that is equipped with on the inclined plane of holding surface, a chuck of spring clamp runs through logical groove, and still vertical open slot that is equipped with on the locating piece, and in another chuck gos deep into the open slot, two chucks centre gripping in opposite directions, with the three centre gripping including, through the open slot, can make things convenient for the dismantlement of spring clamp.
Further optimization, the sleeper-supporting frame further comprises a bolt, wherein a plurality of strip holes are formed in the base plate, and the bolt is anchored to the sleeper through the strip holes; for adjusting the anchoring point through the elongated hole.
The bolt penetrates through the cover plate, a second sawtooth surface is arranged between the cover plate and the elongated hole, and the cover plate can move along the length direction of the elongated hole; for the anchor of stabilizing the bolt, in this scheme, be equipped with the apron, wherein apron passes through second sawtooth surface and rectangular hole upper surface connection, after adjusting the position in the length direction along the rectangular hole, the bolt is stabilized to accessible second sawtooth surface.
Compared with the prior art, the invention has the following advantages and beneficial effects:
this scheme provides a support in succession and float rail formula fastener system, adopts this scheme, can reach under keeping lower vertical rigidity, improve the horizontal rigidity of system, realizes the decoupling zero of the horizontal rigidity of hanging down, keeps good shock attenuation effect.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:
FIG. 1 is a schematic structural view provided by the present invention;
FIG. 2 is a cross-sectional view provided by the present invention;
FIG. 3 is a schematic structural diagram of an adjusting block provided in the present invention;
FIG. 4 is a spring clamp preload pattern provided by the present invention;
FIG. 5 is a diagram of equivalent stress and plastic strain of the system under different pre-stresses provided by the present invention;
FIG. 6 is a graph of the overall equivalent stress and plastic strain of the system provided by the present invention;
FIG. 7 is a graph of equivalent stress and plastic strain for a front plate according to the present invention;
FIG. 8 is a graph of equivalent stress versus plastic strain for a substrate provided by the present invention;
FIG. 9 is a graph of equivalent stress versus plastic strain for a coupling shim plate provided in accordance with the present invention;
FIG. 10 is a graph of equivalent stress versus plastic strain for a bolt provided by the present invention;
FIG. 11 is a vertical transverse stress flow pattern of a supporting rubber block provided by the present invention;
FIG. 12 is a graph of equivalent stress and plastic strain for the new system at different pre-stresses provided by the present invention;
FIG. 13 is a graph of equivalent stress for a mass bar provided by the present invention;
FIG. 14 is an equivalent stress diagram of a supporting rubber block provided by the present invention;
FIG. 15 is a graph of transition region equivalent stress provided by the present invention;
FIG. 16 is a graph comparing the improved front and rear vertical stiffness provided by the present invention;
FIG. 17 is a graph comparing the improved front to back lateral stiffness provided by the present invention.
Reference numbers and corresponding part names in the drawings:
1-supporting rubber block, 2-mass vulcanizing rod, 3-track, 4-base plate, 41-limiting boss, 42-strip hole, 5-front side plate, 51-supporting leg, 6-positioning block, 7-adjusting block, 8-spring clamp, 9-bolt, 10-cover plate and 11-coupling base plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a support in succession and float rail formula fastener system, as shown in fig. 1-3, including withholding support block rubber 1 in rail waist department, support block rubber 1 inside is equipped with a plurality of quality and vulcanizes excellent 2, quality vulcanizes excellent 2 and is on a parallel with the main stress direction under the support block rubber 1 transverse load to the main stress direction under the perpendicular to support block rubber 1 vertical load.
Compared with the prior art, the vertical stiffness and the transverse stiffness of the floating rail type fastener system are basically provided by the compression, the shearing and the torsion of the supporting rubber block 1, the vertical stiffness and the transverse stiffness of the system are greatly dependent on the rubber quality, the rigidity coupling of the system in all directions is strong, so that although the lower vertical displacement ensures the better vibration damping effect, the transverse stiffness is too low, the transverse vibration of the rail 3 is severe under the transverse excitation action of the wheel rail, and the dynamic gauge holding capacity is poor; the scheme provides a continuous support floating rail type fastener system, and by adopting the scheme, the transverse rigidity of the system can be improved under the condition of keeping lower vertical rigidity, the decoupling of the vertical and transverse rigidity is realized, and a good damping effect is kept; specifically, this scheme is equipped with a plurality of qualities and vulcanizes stick 2 supporting 1 inside of block rubber, wherein quality vulcanizes stick 2 and is supporting 1 inside high quality pole of vulcanizing of block rubber, 2 multitrack 3 of a plurality of qualities vulcanize the stick and support in succession, and it is on a parallel with the principal stress direction under the 1 transverse load of supporting block rubber, and the principal stress direction under the 1 vertical load of perpendicular to supporting block rubber, just can vulcanize the transverse rigidity who improves the system through the quality this moment, reduce the transverse vibration of track 3 under the transverse excitation of wheel rail, good shock attenuation effect has been reached.
In this embodiment, the mass vulcanizing rods 2 are uniformly distributed along the length direction of the rail 3, a plurality of rows of mass vulcanizing rods 2 are arranged in the supporting rubber block 1 positioned on the inner side of the rail 3, the plurality of rows of mass vulcanizing rods 2 are vertically arranged along the rail 3, and the number of the rows is ≧ 2; in order to improve the continuity of rigidity, in the scheme, the mass vulcanizing rods 2 are uniformly distributed along the length direction of the track 3 and can be arranged in multiple rows, the inner side of the track 3 has more strength, so that the mass vulcanizing rods 2 on the inner side need to be more than the outer side, the arrangement shown in the scheme is only one expression form, and the mass vulcanizing rods 2 are only parallel to the main stress direction under the transverse load of the supporting rubber block 1 and perpendicular to the main stress direction under the vertical load of the supporting rubber block 1, and how to arrange the mass vulcanizing rods in quantity, diameter and length is within the protection range of the scheme.
In the embodiment, the track further comprises a base plate 4, wherein two front side plates 5 are arranged on the base plate 4, the two front side plates 5 are respectively arranged on the inner side and the outer side of the track 3, the inner side of each front side plate 5 is used for buckling and pressing the supporting rubber block 1 on the rail waist, the outer side of each front side plate 5 is provided with a supporting part, and the front side plates 5 are supported on the base plate 4 through the supporting parts; in order to stably buckle the supporting rubber block 1 on the rail waist, in the scheme, the inner side and the outer side of the rail 3 are respectively provided with the front side plate 5, the inner side surface of each front side plate 5 can be stably attached to the surface of the supporting rubber block 1 and is clamped and buckled on the rail waist, the outer side surface of each front side plate is fixed on the base through the supporting legs 51, and the two front side plates 5 act oppositely to enable the rail 3 to suspend on the base plate 4.
In this embodiment, two ends of the supporting portion are provided with supporting legs 51, the front side plate 5 is supported on the base plate 4 through the supporting legs 51, the base plate 4 is provided with a limiting boss 41, the limiting boss 41 is provided with an upper cover plate 10, and the bottom of each supporting leg 51 is provided with a branch section pressed by the upper cover plate 10; in order to facilitate the disassembly, the two ends of the supporting part are provided with the supporting legs 51, the bottom of each supporting leg 51 is provided with an extending section, the two extending sections extend oppositely, and at the moment, the supporting legs 51 can be pressed by the upper cover plate 10 of the limiting boss 41 on the base, so that the quick assembly and disassembly are realized, and the supporting legs are used for fixing the front side plate 5 vertically; the connection position of the base and the expenditure section is preferably a plane, and when the base and the expenditure section are disassembled, the expenditure section only needs to slide into the lower part of the upper cover plate 10, so that the limit fixation can be realized.
In the embodiment, the positioning device further comprises a positioning block 6 and an adjusting block 7, the positioning block 6 is fixedly arranged on the base plate 4, a supporting surface is arranged between the two supporting legs 51, the positioning block 6 is abutted against the supporting surface through the adjusting block 7, a matched inclined surface is arranged between the adjusting block 7 and the supporting surface, the inclined surface is arranged along the length direction of the track 3, the bottom of the inclined surface is inclined towards the direction far away from the track 3, and the adjusting block 7 can move along the height direction of the positioning block 6; for realizing the stable support to preceding curb plate 5, in this scheme, still be equipped with locating piece 6 on the base, wherein locating piece 6 and base integrated into one piece or detachable connection, 6 sides of locating piece support the holding surface through regulating block 7, wherein be swing joint between locating piece 6 and the regulating block 7: the adjusting block 7 can move along the height direction of the positioning block 6, and a matched inclined plane is arranged between the adjusting block 7 and the supporting surface, so that the front side plate 5 can be pressed only by adjusting the upper and lower positions of the adjusting block 7, and the adjusting block is used for transversely fixing the front side plate 5; and wherein the inclined plane sets up along 3 length direction on the track, and the bottom inclines towards the party of keeping away from track 3 for make things convenient for dismouting regulating block 7, realize preceding lateral plate 5 fixed on transversely fast.
In this embodiment, the adjusting block 7 is provided with a through groove for clamping two sides of the positioning block 6, and a first sawtooth surface is provided between the bottom side of the through groove and the positioning block 6; in order to limit the movement of the adjusting block 7, in the scheme, the adjusting block 7 is provided with a through groove along the height direction of the positioning block 6, the positioning block 6 can be clamped in the through groove at two sides, so that the adjusting block 7 can stably move along the height direction of the positioning block 6, and a first sawtooth surface matched with the through groove is arranged between the bottom side of the through groove and the positioning block 6 and used for limiting the movement of the adjusting block 7 in the height direction of the positioning block 6 after the adjusting block 7 is transversely fixed on the front side plate 5.
In this embodiment, the clamping device further comprises a spring clamp 8, and the two clamping heads of the spring clamp 8 clamp oppositely and are used for clamping the front side plate 5, the positioning block 6 and the adjusting block 7; in order to prevent the elastic element from being damaged due to overlong service time under the condition of no maintenance, in the scheme, the spring clamp 8 is arranged, namely the locking elastic strip, wherein the spring clamp 8 is made of spring steel and is painted to be bright in color so as to identify and check the state of the spring clamp, the spring clamp 8 can clamp the front side plate 5, the positioning block 6 and the adjusting block 7, when the fastener operates normally and has a good state, the spring clamps 8 do not play any role, and the front side plate 5 is positioned at the proper position of the shoulder through the pressure effect of the supporting rubber block 1. The purpose of the spring clamp 8 is to prevent the supporting rubber block 1 from being damaged due to long service time without maintenance, and the spring clamp 8 prevents the front side plate 5 from moving relative to the blocking shoulder, so that the supporting side plate cannot move outwards to cause the track gauge to increase.
In this embodiment, one chuck of the spring clamp 8 penetrates through the inclined surface on the supporting surface, an open slot is formed in one side of the positioning block 6 away from the adjusting block 7, and the other chuck of the spring clamp 8 extends into the open slot; in order to facilitate the dismantlement and the stable centre gripping of spring clamp 8, in this scheme, vertically on the inclined plane of holding surface be equipped with logical groove, logical groove is run through to a chuck of spring clamp 8, and still vertically on locating piece 6 is equipped with the open slot, and another chuck is deep into in the open slot, and two chucks are centre gripping in opposite directions, with including the three centre gripping, through the open slot, can make things convenient for the dismantlement of spring clamp 8.
In this embodiment, the sleeper further comprises a bolt 9, a plurality of elongated holes 42 are formed in the substrate 4, and the bolt 9 is anchored to the sleeper through the elongated holes 42; for adjusting the anchoring point through the elongated hole 42.
In this embodiment, the cover plate 10 is further included, the cover plate 10 is tightly attached to the upper surface of the elongated hole 42, the bolt 9 penetrates through the cover plate 10, a second sawtooth surface is arranged between the cover plate 10 and the elongated hole 42, and the cover plate 10 can move along the length direction of the elongated hole 42; in order to stabilize the anchoring of the bolt 9, in the present embodiment, a cover plate 10 is provided, wherein the cover plate 10 is connected to the upper surface of the elongated hole 42 through the second serrated surface, and the bolt 9 can be stabilized through the second serrated surface after the position of the cover plate 10 is adjusted in the length direction of the elongated hole 42.
Example 2
This example was further optimized on the basis of example 1, and provided a simulation experiment, as shown in fig. 4 to 17.
1. Setting parameters:
the floating rail type fastener system is a typical rail waist supporting type fastener, and is widely applied to urban rail transit as a fastener with a good vibration damping effect at present. The floating rail type fastener system mainly comprises a rail waist supporting rubber wedge block, a supporting baffle plate, a spring clamp 8, a positioning wedge block, a spiral spike, a base plate and the like.
The rail waist support type fastener system is not specially specified aiming at the current national standard recommended or enforced standard, and only a few specified limits are made on urban rail transit fasteners in related specifications including BSEN 13146 experimental method for rail application-rail-fastener system, TB/T2626 and 1995 technical conditions for rubber tie plates under railway concrete sleepers, elastic tie plates of rail transit fastener system, temporary technical conditions of WJ-8 fastener system and the like. Considering that the general industry specification is stricter than GB, the related specification in Q/CBS 001-. Parameters related to material characteristics of each part, system rigidity and the like are calculated according to the specification.
The floating rail type vibration reduction fastener system comprises a base plate 4, a front side plate 5, a supporting rubber block 1, a positioning adjusting block 7, a distance adjusting tooth block, a coupling base plate 11, a rail lower liner, a height adjusting base plate and the like, wherein the base plate 4, the front side plate 5, the supporting rubber block 1, a positioning block 6, the adjusting block 7, the coupling base plate 11 and the rail lower liner are called as a fastener after being assembled.
(1) Rubber material
The supporting rubber block 1 is made of natural rubber, reclaimed rubber cannot be used, and the technical performance index of the supporting rubber block meets the requirements of the items in the table 1.
TABLE 1 rubber parameters
(1) Iron casting
QT450-10 is adopted to base plate 4, locating piece 6, preceding curb plate 5 and regulating block 7 material, and its mechanical properties should satisfy the requirement of GB1348, and the balling grade must not be low thousand 3 grades.
(2) Polyethylene material
The coupling backing plate 11 is made of low-density polyethylene material, the heightening backing plate is made of high-density polyethylene material, and the technical performance indexes of the heightening backing plate accord with the requirements of the items in the table 2 according to GB/T21527.
TABLE 2 polyethylene parameters
2. Overall performance
The vertical secant static stiffness of the fastener system is 5 kN/mm-8 kN/mm (load range: 5 KN-25 KN), the performance index is specifically designed according to specific circuit conditions, and the dynamic-static ratio is less than 1.4. The longitudinal resistance of a single fastener is 3-20 kN. Applying a vertical load of 8 kN-40 kN (a transverse load of 4 kN-20 kN), and after 300 ten thousand load cycles, not damaging and cracking; the static rigidity of the fastener changes by less than 10 percent. The rail gauge keeping capacity is that the vertical load is 8 kN-40 kN (the transverse load is 4 kN-20 kN), after 300 ten thousand load cycles, the unilateral rail gauge expansion is not more than 4mm, and the rail bottom transverse displacement is not more than 2.5 mm.
3. Installation in situ
The floating rail fastener moves the restraint mode of the steel rail from the bottom of the steel rail to the rail web, and applies fastening pressure to the rail web through the locking mechanism, as shown in fig. 4, the locking elastic strip, namely the spring clamp 8, is made of spring steel and is painted in bright color so as to identify and check the state of the locking elastic strip. These locking springs do not play any role when the fastener is functioning properly and in good condition. The front side plate 5 and the adjusting block 7 are positioned at the proper position of the shoulder by the pressure action of the supporting rubber block 1. The purpose of the locking spring strip is to prevent the supporting rubber block 1 from being damaged due to long service time without maintenance. The locking elastic strip prevents the front side plate 5 and the adjusting block 7 from moving relative to the blocking shoulder, so that the front side plate 5 cannot move outwards to cause the increase of the track gauge. Therefore, the safety of the fastener can be rapidly checked by judging the state of the locking elastic strip on the site.
4. Refined finite element modeling simulation
After a three-dimensional entity model of the fastener system is established by using three-dimensional modeling software UG, comsol is introduced to establish a three-dimensional refined finite element full model for steady state research. The fastener system mainly provides elasticity and support by support rubber block 1 and preceding curb plate 5, and locating piece 6 and regulating block 7 pass through spring clamp 8 and recess and mutual consolidation with base plate 4, and base plate 4 passes through bolt 9 and links to each other with the concrete sleeper, and these parts can neglect its mutual influence and set up to binding contact, and the contact of other rubber spare sets up to frictional contact, and the algorithm selects to increase lagrangian. A single fastener was used in the comsol software for the simulation calculations. The front plate 5 and the bolts 9 are modeled with small plastic strains without motion hardening. The bolt 9 pretension is about 45 kN. The initial yield stress of the front side plate 5 is 310MPa, and the isotropic tangent modulus is 17.3 GPa; the initial yield stress of the bolt 9 is 235MPa, and the isotropic tangential modulus is 17.3 GPa.
The grid is a swept cubic grid of 52675 cells, which are quadratic functions. The bottom of the coupling base plate 11 is provided with fixed restraint, and the bottom surface of the steel rail is free.
Table 3 material parameter table of each component
TABLE 4 parts contact pairs
5. Static analysis of floating rail type fastener
5.1 Normal service State
The hydrostatic response of the system under different pre-stress conditions is analyzed in view of the overload/underload problem that may occur during rail jacking due to pre-stressing during construction installation, see fig. 5 and 6.
As can be seen from fig. 5 above, as the pre-stress increases, the equivalent stress undergoes a change of elasticity before elastoplasticity. After the pre-pressure of 1.688MPa, the system generates plastic deformation, and stress concentration mainly occurs at the corner of the front side plate 5. Part of the field data shows that: the maximum pre-pressure in the process of jacking the steel rail by the mounting device is about 235psi, namely 1.586 MPa. As can be seen from fig. 7, too fast stress concentration at the corners of the front side panel 5 leads to the first occurrence of plastic strain. And the other parts do not generate plastic deformation under the normal service state. The maximum stress of the front side plate 5 is 245 MPa.
Fig. 8-10 are equivalent stress and plastic strain diagrams of other parts, and it can be seen from the diagrams: the substrate 4 portion is subjected to a large stress at a portion in contact with the front side plate 5 due to contact, support, or the like, and is about 395MPa at maximum. The local stress concentration is caused because the base plate 4 and the front side plate 5 are in contact only in a small area, the contact area is small, and the load is large. The supporting rubber block 1 and the coupling pad 11 have small stress. The bolt 9 has no obvious plastic behavior under the normal service state, and the maximum stress is about 92.5 MPa.
5.2 stiffness calculation
Based on the steady state solution of the system in the normal service state, the static stiffness of the system is solved according to the standard loading. And (3) vertically applying point load above the rail top of the steel rail to calculate vertical rigidity, and applying transverse displacement to the position 16mm away from the rail top on the side of the rail head of the steel rail to calculate vertical and transverse rigidity.
It has been found through calculation that the vertical and lateral stiffness of the floating rail type fastener system is basically provided by the compression, shearing and torsion of the supporting rubber block 1, and is largely only dependent on the rubber quality. The system has strong rigidity coupling in all directions, so that the transverse rigidity is too low although the vibration reduction effect is ensured to be better due to lower vertical displacement, the transverse vibration of the track 3 under the transverse excitation action of the wheel track is severe, and the dynamic track gauge holding capacity is poor.
Under the two working conditions of the vertical direction and the transverse direction, the transmission path of the stress on the steel rail-supporting rubber block 1 is shown in fig. 11. According to the stress flow theory: the force transmission path is influenced more when the force transmission path is parallel to the main stress direction, and is influenced less when the force transmission path is perpendicular to the main stress direction. Based on the above, high-quality round rods are vulcanized in the supporting rubber block 1, and the distribution of the mass rods is arranged according to the main stress direction of the cross section of the supporting rubber block 1 under the action of vertical and transverse loads, wherein the mass rods are parallel to the main stress direction under the transverse load and perpendicular to the main stress direction under the vertical load. Therefore, the horizontal stiffness of the system is improved and the vertical and horizontal stiffness is decoupled under the condition of keeping lower vertical stiffness.
6 improvement based on stress flow theory
6.1 model based on stress flow theory
The rubber internal vulcanization mass bar is shown in FIG. 2, according to the above paragraph. Through the optimized design on the structure size of each part, the diameter, the length and the distribution number of the mass rods are compared and selected, and firstly, the diameter is 8mm, and the length is 40 mm; ② the diameter is 6mm and the length is 25 mm. And (3) selecting the inner rail from the side I and selecting the outer rail from the side I, wherein 5 rows of single spans are longitudinally arranged. The rigidity continuity is further achieved with a uniform distribution in the longitudinal direction along the rail 3.
6.2 stress flow theory model static analysis
After the finite element model is established, the equivalent stress and the plastic strain of the system under different pre-pressures are calculated in the same way, see fig. 12, and it can be seen from fig. 12 that as the pre-pressure increases, the equivalent stress undergoes the change of elastic property first and then elastic-plastic property. After the pre-pressure is 1.37MPa, the system generates plastic deformation, mainly generates stress concentration at the corner of the side plate, and easily generates plastic strain under a normal service state. As can be seen from fig. 13 and 14, the equivalent stress of the mass rod is 106MPa, and in the ideal case that the mass rod and the rubber are completely vulcanized, the deformation of the transition zone is smooth, and the discontinuous tearing condition is not generated, as shown in fig. 15.
As shown in fig. 16 and 17, when the static stiffness is calculated for the improved system model and compared with the original floating rail fastener, the calculation shows that: the vertical transverse rigidity of the improved system is as follows:
through above experiment, the new system fastener that this scheme provided compares with former superficial rail fastener, very big enhancement the transverse rigidity of system, make the system keep good shock attenuation effect.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a support superficial rail formula fastener system in succession, is including withholding support block rubber (1) of rail waist department, its characterized in that, support block rubber (1) inside is equipped with a plurality of qualities and vulcanizes stick (2), quality vulcanizes stick (2) and is on a parallel with the main stress direction under support block rubber (1) transverse load to the perpendicular to supports the main stress direction under block rubber (1) vertical load.
2. The continuous support floating rail type fastener system according to claim 1, wherein a plurality of the mass vulcanizing rods (2) are uniformly distributed along the length direction of the rail (3), a plurality of rows of the mass vulcanizing rods (2) are arranged in the support rubber block (1) on the inner side of the rail (3), and the plurality of rows of the mass vulcanizing rods (2) are vertically arranged along the rail, and the number of the rows is ≧ 2.
3. The continuous support floating rail type fastener system according to claim 1, further comprising a base plate (4), wherein two front side plates (5) are arranged on the base plate (4), the two front side plates (5) are respectively arranged on the inner side and the outer side of the rail (3), the inner side of each front side plate (5) is used for buckling and pressing the support rubber block (1) to the rail waist, the outer side of each front side plate (5) is provided with a support portion, and the front side plates (5) are supported on the base plate (4) through the support portions.
4. A continuous support floating rail type fastener system according to claim 3, wherein the support part is provided with legs (51) at both ends, the front side plate (5) is supported on the base plate (4) through the legs (51), the base plate (4) is provided with a limit boss (41), the limit boss (41) is provided with an upper cover plate, and the bottom of the legs (51) is provided with a pay-out section pressed by the upper cover plate.
5. The continuous support floating rail type fastener system according to claim 4, further comprising a positioning block (6) and an adjusting block (7), wherein the positioning block (6) is fixedly arranged on the base plate (4), a supporting surface is arranged between the two legs (51), the positioning block (6) abuts against the supporting surface through the adjusting block (7), a matched inclined surface is arranged between the adjusting block (7) and the supporting surface, the inclined surface is arranged along the length direction of the rail (3), and the bottom of the inclined surface inclines towards the side far away from the rail (3); the adjusting block (7) can move along the height direction of the positioning block (6).
6. The continuous support floating rail type fastener system according to claim 5, wherein the adjusting block (7) is provided with a through groove (71), the through groove (71) is used for clamping two sides of the positioning block (6) inside, and a first matched serrated surface is arranged between the bottom side of the through groove (71) and the positioning block (6).
7. The continuous support floating rail type fastener system according to claim 5, further comprising a spring clamp (8), wherein two clamping heads of the spring clamp (8) clamp towards each other to clamp the front side plate (5), the positioning block (6) and the adjusting block (7) inside.
8. The continuous support floating rail type fastener system according to claim 7, wherein one clamping head of the spring clamp (8) penetrates through the inclined surface of the support surface, an open slot is formed in one side of the positioning block (6) far away from the adjusting block (7), and the other clamping head of the spring clamp (8) extends into the open slot.
9. A continuously supporting floating rail fastener system according to claim 3, further comprising a bolt (9), said base plate (4) having a plurality of elongated holes (42) formed therein, said bolt (9) being anchored to the sleeper through the elongated holes (42).
10. A continuous support floating rail type fastener system according to claim 9, further comprising a cover plate (10), wherein the cover plate (10) is tightly attached to the upper surface of the elongated hole (42), the bolt (9) penetrates through the cover plate (10), a second sawtooth surface is arranged between the cover plate (10) and the elongated hole (42), and the cover plate (10) can move along the length direction of the elongated hole (42).
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