Pile platform supporting type floating ballast bed

Abstract

The utility model relates to the technical field of urban rail transit, in particular to a pile platform supporting type floating ballast bed. The limiting device is arranged on the bearing platform and used for limiting the prefabricated track plate in the horizontal direction, the bearing platform is fixed to the top of the pile column, at least part of the pile column is fixedly embedded in a foundation, and the pile column and the bearing platform are arranged in the extending direction of a steel rail at intervals. The limiting devices are fixed to the bearing platforms or integrally arranged with the bearing platforms, the two ends, in the extending direction of the steel rails, of the prefabricated track plates are erected on the two adjacent or non-adjacent bearing platforms correspondingly, and the elastic vibration isolation devices are arranged between the prefabricated track plates and the bearing platforms. The pile platform supporting type floating track bed is simple and compact in structure, easy to maintain, good in applicability, high in cost performance, safe and reliable; the vibration isolator is widely applied to vibration isolation engineering of lines outside a garage, tunnels and elevated line connecting sections of urban rail transit vehicle depots.

Description

TECHNICAL FIELD

[0001] The utility model belongs to urban rail transit technical field, especially relate to a prefabricated type floating track bed of no base structure. BACKGROUND

[0002] In recent years, the urban rail transit construction scale develops rapidly in China. At present, in the vehicle depot with the upper cover property, in order to avoid the vibration and noise interference of rail vehicle when running in the line section outside the depot to the surrounding environment and property, the control technical measure that the broken stone track bed is combined with the damping pad is usually adopted, and the vibration reduction effect target of 10dB is realized in the design. However, it is found in practice that this kind of technical scheme has many deficiencies, mainly as follows, first, the track bed structure that the broken stone track bed is fully paved with the damping pad needs to be uniformly spaced under the whole track bed structure to ensure the stability of the whole track bed structure, and the number of piles is large, and the cost is high. Second, the lateral restraint force of broken stone is insufficient, so the seamless track structure cannot be used, and the vibration and noise are large in the operation process. Third, the damping pad cannot be replaced during the skylight time in the use process, and the maintenance is difficult. Fourth, detection shows that the final vibration reduction effect of the damping pad and the broken stone track bed in a considerable part of the vehicle depot is much smaller than the theoretical effect, and the main reasons include: (1) the product quality stability of the damping pad is poor; (2) the damping pad is damaged by the broken stone, and the damping performance is reduced; (3) the damping pad is damaged by the broken stone, and the damping performance is reduced. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at overcoming the above-mentioned defects, and provides a pile platform supporting type floating track bed with efficient and stable vibration reduction effect, seamless small radius curve, convenient operation and maintenance and better economy.

[0004] The pile platform supporting type floating track bed is realized as follows, including the elastic vibration isolation device, further including the pile column, the pile cap, the prefabricated track plate and the limiting device for limiting the prefabricated track plate in the horizontal direction and arranged on the pile cap, the pile cap is fixed on the top of the pile column, the pile column is at least partially embedded in the foundation, the pile column and the pile cap are arranged at intervals along the extension direction of the steel rail, the limiting device is fixed on the pile cap or integrally arranged with the pile cap, the two ends of the prefabricated track plate along the extension direction of the steel rail are respectively arranged on the adjacent or non-adjacent two pile caps, and the elastic vibration isolation device is arranged between the prefabricated track plate and the pile cap.

[0005] The specific structure of the limiting device in the pile cap supporting type floating track bed can be various, for example, the limiting device comprises a limiting column or a limiting protrusion which is integrally arranged on the bearing platform, or a limiting piece which is fixedly connected with the bearing platform through a connecting fastener.

[0006] The pile column and the bearing platform are independently arranged corresponding to each steel rail of the track line, or share one bearing platform corresponding to two steel rails of the same track line.

[0007] The specific structure form of the prefabricated track plate in the pile cap supporting type floating track bed can also be various, in addition to the conventional plate type prefabricated track plate, typically, the prefabricated track plate is composed of a prefabricated track single plate, the prefabricated track single plate is arranged corresponding to each steel rail, and the two ends of the prefabricated track single plate in the extension direction of the steel rail are respectively arranged on the adjacent or non-adjacent two bearing platforms; or the prefabricated track plate is a prefabricated track frame plate, the prefabricated track frame plate is integrally prefabricated or prefabricated and assembled by a prefabricated track single plate and a connecting beam, and two prefabricated track single plates in the prefabricated track frame plate are respectively arranged corresponding to two steel rails of the same track line, and the two ends of the prefabricated track frame plate in the extension direction of the steel rail are respectively arranged on the adjacent or non-adjacent two bearing platforms.

[0008] In order to avoid prestress concentration, the end portion of the prefabricated track single plate is provided with a fillet on both sides, or the end portion is provided with an inward chamfer. The elastic vibration isolation device in the pile cap supporting type floating track bed comprises various types of vibration isolators such as rubber damping pads, polyurethane damping pads, metal rubber composite vibration isolators, rubber vibration isolators or steel spring damping vibration isolators. In order to facilitate the limiting of the elastic vibration isolation device, the vibration isolator limiting structure for limiting the elastic vibration isolation device in the horizontal direction can be arranged on the bearing platform and / or the prefabricated track plate corresponding to the elastic vibration isolation device, and the vibration isolator limiting structure comprises various specific structure forms such as a limiting groove, or a limiting protrusion, or a limiting fastening connecting piece, or a limiting piece fixed by a fastener.

[0009] In order to adjust the height and level, an adjusting gasket can be arranged between the elastic vibration isolation device and the prefabricated track plate.

[0010] As a typical application scheme, the elastic vibration isolation device can be used to support the end portions of two adjacent prefabricated track slabs simultaneously. Preferably, the elastic vibration isolation device comprises an upper shell, a spiral steel spring and a lower shell, the lower shell is provided with damping material, the spiral steel spring is partially arranged in the damping material, the upper shell is provided with threaded connection holes corresponding to the adjacent prefabricated track slabs supported and matched, the prefabricated track slabs are provided with assembly clearance holes and connecting screws corresponding to the threaded connection holes, and the connecting screws pass through the assembly clearance holes and are matched with the threaded connection holes to fix and connect the prefabricated track slabs and the elastic vibration isolation device.

[0011] In addition, in order to improve the integrity of the system, the pile cap supporting type floating track bed can further comprise a shear hinge, and the adjacent prefabricated track slabs are connected together through the shear hinge, so that the end portions of the adjacent prefabricated track slabs always keep vertical displacement synchronization.

[0012] In order to improve the stability and safety of the system, the pile cap supporting type floating track bed can further comprise a counterpressure device, and the counterpressure device comprises a counterpressure connecting piece, a counterpressure disc and an anchoring piece, the anchoring piece is fixedly arranged on the bearing platform, the lower end of the counterpressure connecting piece is connected with the anchoring piece, and the upper end of the counterpressure connecting piece is matched with the counterpressure disc to press the counterpressure disc tightly on the prefabricated track slab.

[0013] Considering the cost performance comprehensively, the length of the prefabricated track slab is preferably 2-40 times of the standard interval of the rail fastener.

[0014] Compared with the technical scheme of the traditional gravel track bed combined with the damping pad, the pile cap supporting type floating track bed uses the interval arranged pile columns and bearing platforms to support the elastic vibration isolation device and the prefabricated floating slab, and the new floating track bed structure has the following advantages: (1) only the pile columns corresponding to the bearing platforms are arranged below the rails or on both sides of the rails, the number of piles is greatly reduced, and the construction cost is greatly reduced; (2) the geological condition adaptability is good, and for the section with soft soil, deep foundation piles can be used as pile columns, which are safe and reliable; (3) the adjustment amount is large, and the problems such as ground subsidence can be easily solved, the main structure is exposed above the foundation, the maintenance is more convenient, and the maintenance can be completed during the skylight time; (4) the track bed structure stability is better, the seamless line can be realized, and the vibration and noise during the operation of the line are smaller; (5) compared with the existing gravel track bed, the pile cap supporting type floating track bed of the utility model does not need daily maintenance work such as tamping, and the maintenance workload is less; (6) the damping performance is more stable, which is conducive to realizing better damping effect and ensuring the realization of the damping design index; (6) the overall construction cost of the project is lower, and the cost can be reduced by more than 15%, and the cost reduction and benefit increase are truly realized. The construction method of the pile cap supporting type floating track bed of the utility model is simple, easy to operate, fast in construction speed, and easy to guarantee the engineering quality.

[0015] In summary, the present invention, a pile-supported floating track bed, has a simple and compact structure, is easy to maintain, has good applicability, high cost performance, and is safe and reliable. It can be widely used in track vibration isolation projects in urban rail transit depots, tunnel and elevated line connection sections, and other locations. Attached Figure Description

[0016] Figure 1 This is one of the structural schematic diagrams of the pile-supported floating track bed of this utility model.

[0017] Figure 2 for Figure 1 A sectional view along the AA direction.

[0018] Figure 3 This is the second structural schematic diagram of the pile-supported floating track bed of this utility model.

[0019] Figure 4 for Figure 3 BB-direction sectional view.

[0020] Figure 5 This is the third structural schematic diagram of the pile-supported floating track bed of this utility model.

[0021] Figure 6 This is the fourth structural schematic diagram of the pile-supported floating track bed of this utility model.

[0022] Figure 7 for Figure 6 CC-direction sectional view.

[0023] Figure 8 This is the fifth structural schematic diagram of the pile-supported floating track bed of this utility model.

[0024] Figure 9 for Figure 8 DD section view.

[0025] Figure 10 This is the sixth structural schematic diagram of the pile-supported floating track bed of this utility model.

[0026] Figure 11 for Figure 10 EE-directed sectional view.

[0027] Figure 12 This is the seventh structural schematic diagram of the pile-supported floating track bed of this utility model.

[0028] Figure 13 for Figure 12 FF section view.

[0029] Figure 14 This is the eighth schematic diagram of the structure of the pile-supported floating track bed of this utility model.

[0030] Figure 15 is a G-G sectional view. Figure 14

[0031] Figure 16 is a structure schematic view No.9 of the pile platform supporting type floating track bed.

[0032] Figure 17 is a H-H sectional view. Figure 16 DETAILED DESCRIPTION

[0033] Embodiment one

[0034] As shown in Figure 1 and Figure 2 , the pile platform supporting type floating track bed of the utility model, including elastic vibration isolation device 1, elastic vibration isolation device 1 specifically for rubber shock pad, in addition still including pile 2, bearing platform 3, prefabricated track board and the limiting device that is set in bearing platform 3 for prefabricated track board in horizontal direction limit;Bearing platform 3 is fixed at the top of pile 2, specifically, bearing platform 3 and pile 2 are fixedly connected together by corresponding preset steel flange (not specifically shown in the drawing) butt welding, the pile 2 part is embedded in foundation 7, and the pile 2 and bearing platform 3 are arranged at intervals along the extension direction of the rail, and the pile 2 and bearing platform 3 are independently provided corresponding to each rail 8 of the track line;The prefabricated track board is composed of prefabricated track single board 4, and the prefabricated track single board 4 is arranged corresponding to each rail 8, and the two ends of the prefabricated track single board 4 along the extension direction of the rail 8 are respectively erected on the adjacent two bearing platforms 3, and the elastic vibration isolation device 1 is arranged between the prefabricated track single board 4 and the bearing platform 3;The limiting device includes H-shaped limiting protrusion 5 integrally arranged on bearing platform 3 corresponding to prefabricated track single board 4, and the horizontal movement of the prefabricated track single board 4 is comprehensively constrained by the H-shaped limiting protrusion 5 arranged at both ends, and the elastic buffer structure 6 is arranged between the limiting protrusion 5 and the prefabricated track single board 4, and the elastic buffer structure 6 is specifically an elastic pad made of rubber;The rail 8 is fixed on the surface of the prefabricated track single board 4 by the fastener system 9.

[0035] When the pile platform supporting type floating track bed of the utility model shown in Figure 1 and Figure 2 is constructed, the following steps can be performed:

[0036] S1, the pile 2 and the bearing platform 3 are constructed, specifically, the foundation pit is excavated, the pile 2 is fixed in the foundation pit by piling, and the prefabricated bearing platform 3 is welded and fixedly connected with the pile 2, the limiting protrusion 5 is integrally arranged with the bearing platform 3, and the two are formed by pouring together during prefabrication, and the earthwork is backfilled;

[0037] S2, the elastic vibration isolation device 1 is placed on the bearing platform 3 according to the position coordinates;

[0038] ​​S3, place the prefabricated track slab on the elastic vibration isolation device 1, and the prefabricated track slab is specifically a prefabricated track single slab 4;

[0039] S4, according to the position coordinates, an elastic buffer structure 6, i.e. an elastic pad, is arranged between the prefabricated track single slab 4 and the limiting protrusion 5, so that the spatial position of the prefabricated track single slab 4 is finely adjusted;

[0040] S5, the position of the prefabricated track single slab 4 is locked by the limiting protrusion 5 and the elastic pad;

[0041] S6, the fastener 9 is installed on the prefabricated track single slab 4, the steel rail 8 is laid, and the position of the steel rail 8 is finely adjusted to meet the design requirements;

[0042] S7, the construction of the floating track bed structure is completed.

[0043] Compared with the technical scheme of the traditional gravel track bed combined with the damping pad, the pile platform supporting type floating track bed utilizes the interval arranged pile columns and the bearing platform to support the elastic vibration isolation device and the prefabricated floating slab, and the new floating track bed structure has the following advantages: (1) the pile columns are arranged only below the steel rail or on both sides of the steel rail corresponding to the bearing platform, the number of piles is greatly reduced, and the construction cost is greatly reduced; (2) the adaptability to geological conditions is good, and for the section with soft soil, deep foundation piles can be used as pile columns, which are safe and reliable; (3) the adjustment amount is large, and the problems such as ground subsidence can be easily solved, the main structure is exposed above the foundation, the maintenance is more convenient, and the work can be completed during the skylight time; (4) the track bed structure is more stable, seamless track can be realized, and the vibration and noise during operation of the track are smaller; (5) compared with the existing gravel track bed, the pile platform supporting type floating track bed of the utility model does not need daily maintenance work such as tamping, and the maintenance workload is less; (6) the damping performance is more stable, which is beneficial to realize better damping effect and ensure the realization of the damping design index; (6) the overall construction cost of the project is lower, and the cost can be reduced by more than 15%, and the cost reduction and benefit increase are truly realized. The construction method of the pile platform supporting type floating track bed is simple and easy to operate, the construction speed is fast, and the engineering quality is easy to guarantee.

[0044] In conclusion, the pile platform supporting type floating track bed has the advantages of simple and compact structure, good applicability, high cost performance and safety and reliability; the construction method of the pile platform supporting type floating track bed is simple, safe and efficient, and can be widely applied to the track vibration isolation engineering of the line outside the urban rail transit vehicle depot, the connection section of the tunnel and the elevated line and the like.

[0045] It needs to be explained that in this example, two piles are used for each pile cap, but in actual application, one pile, three piles or more piles can be used for each pile cap, which can be designed according to engineering needs. In addition, the fixing method between the pile and the pile cap can be various, in addition to welding, fasteners can also be used. In addition, in addition to the elastic pad as an elastic buffer structure to achieve buffering and position adjustment between the prefabricated track single board and the limiting protrusion, a curable elastic polyurethane material can also be used to cast an elastic layer on site, which can also achieve good technical effects. In addition, the specific type of the elastic vibration isolation device in the pile cap supporting type floating track bed is various, in addition to the rubber damping pad mentioned above, it can also be a polyurethane damping pad, a metal rubber composite vibration isolator, a rubber vibration isolator or a steel spring damping vibration isolator, etc. It can be selected and used according to the actual engineering needs, and similar technical effects can be achieved. These are simple changes based on the technical principles of the utility model, and are within the scope of protection required by the utility model.

[0046] In addition, it is particularly pointed out that based on the technical principles of this example, the length of the prefabricated track board in the utility model can be designed according to engineering needs. In order to facilitate the arrangement of fasteners, generally, the length of the prefabricated track board is 2-40 times the standard spacing of the rail fastener. The standard spacing of the rail fastener in the current urban rail transit field is 0.6mm, so the length of the prefabricated track board is 1.2m, 1.8m, 2.4m……, and the longest can be 24m. Of course, the design of the length of the board also takes into account the gap between the boards, and the actual product size should be slightly smaller. As shown in Figure 1 , the prefabricated track board is erected on the adjacent two pile caps, at this time the prefabricated track board can be designed to be shorter, for example, it can be 1.2m, 1.8m, 2.4m, etc. That is, the center distance between the adjacent two pile caps is generally not less than 1.2m. Considering the damping effect, construction cost, overall integrity of the track bed structure and other factors, in actual application, the typical length of the prefabricated track board is generally 2.4m or more, to control the number of piles and the number of pile caps, and thus control the construction cost. Because the length combination of the prefabricated track board can be various in engineering application, it cannot be exemplified one by one, and only the text is given here, and the drawings are not described one by one, all of which are within the scope of protection required by the utility model.

[0047] Example two

[0048] As Figure 3 and Figure 4The utility model discloses a pile platform support type floating track bed, and the difference with example one lies in that the pile column 2 is integrally arranged with the bearing platform 3, two steel rails 8 of the same track line share a bearing platform 3, and two pile columns 2 are arranged correspondingly on each bearing platform 3 to give support, wherein the pile columns 2 are all embedded in the foundation 7, and the lower part of the bearing platform 3 is embedded in the foundation 7; the prefabricated track single board 4 is provided with inward chamfers on both sides, and the limiting protrusions 5 are provided with corresponding grooves matched with the prefabricated track single board 4; in addition, the limiting groove is arranged on the bottom surface of the prefabricated track single board 4, and the top of the rubber damping pad of the elastic vibration isolation device 1 is embedded in the limiting groove.

[0049] The utility model discloses a pile platform support type floating track bed in the construction, and the difference with example one lies in that in the process of constructing the pile column 2 and the bearing platform 3 in step S1, after fixing the pile column 2 by piling, the reinforcing cage of the pile column 2 and the bearing platform 3 are fixed and connected, then the formwork is erected, and the bearing platform 3 and the pile column 2 are poured integrally by using concrete, and the earthwork is backfilled after curing is completed; in addition, the H-shaped limiting protrusion 5 is prefabricated separately in advance, and after the curing of the bearing platform 3 is completed, the limiting protrusion 5 and the bearing platform 3 are fixed and connected together by means of secondary pouring on site according to the design position coordinates by using high-strength grouting material. The rest of the construction process is basically the same, and will not be repeated here. In the construction method described in this example, the bearing platform adopts the processing mode of on-site pouring, and since the limiting protrusion 5 adopts the mode of prefabricated components fixed and connected by secondary pouring on site, compared with the mode of on-site pouring and forming of the bearing platform and the limiting protrusion at the same time, the difficulty of on-site construction is greatly reduced, and the position accuracy of the limiting protrusion is also easier to guarantee, and the construction efficiency and accuracy are better. Of course, although it is not the optimal scheme, the utility model also does not exclude the mode of on-site pouring and forming of the bearing platform and the limiting protrusion at the same time, and this construction scheme can also achieve the beneficial technical effects described in the utility model, and is also within the protection scope required by the utility model.

[0050] Compared with example one, in the technical scheme of the pile platform support type floating track bed described in this example, two steel rails of the same track line share a bearing platform, and two pile columns are arranged correspondingly on each bearing platform to give support, and the overall structure is simpler, the area of the bearing platform is larger, and the pile columns are all embedded in the foundation, and the lower part of the bearing platform is also embedded in the foundation, so the stability is better, and the construction efficiency and system safety are improved; in addition, the inward chamfers arranged on both sides of the prefabricated track single board can effectively avoid local stress concentration at the edge corners of the plate body, prevent the prefabricated track single board from being damaged, and improve the service life of the prefabricated track single board; in addition, after the limiting groove is arranged on the prefabricated track single board corresponding to the elastic vibration isolation device, reliable limiting can be provided for the elastic vibration isolation device, and horizontal movement of the elastic vibration isolation device in the use process is prevented.

[0051] Based on the technical principle of the example, in addition to setting inward chamfers on both sides of the prefabricated track single plate, a technical means of setting round corners on both sides of the end of the prefabricated track single plate can also be adopted to achieve the technical effects of preventing local stress concentration at the edge corners of the plate body and avoiding damage at the edge corners of the plate body, which are also within the protection scope required by the utility model.

[0052] Example three

[0053] As Figure 5 shown in the utility model pile cap supporting type floating track bed, the difference from example two is that the limiting device is a limiting piece fixedly connected with the pile cap through connecting fasteners, and the limiting piece is specifically a limiting block 13, the pile cap 3 is provided with an anchoring connecting seat 11 corresponding to the limiting block 13, and the limiting block 13 and the anchoring connecting seat 11 are fixedly connected by using the connecting fastener 12, so as to realize the fixation of the limiting device on the pile cap 3; in addition, it also includes a height adjusting washer 10, which is arranged between the elastic vibration isolation device 1 and the prefabricated track single plate 4.

[0054] Compared with example two, the limiting device is changed into a limiting block detachable with the pile cap, the structure of the pile cap is simpler, the fixed connection operation of the pile cap and the limiting structure is easier to realize, and the position adjustment is also more convenient; since the height adjusting washer is additionally arranged, each prefabricated track single plate can be independently and accurately adjusted in height and level, which is very convenient.

[0055] In addition, compared with example two, in the construction of the utility model pile cap supporting type floating track bed, in step S1, the anchoring connecting seat 11 of the limiting device is integrally cast with the pile cap 3, then the limiting block 13 is pre-installed on the pile cap 3 by using the connecting fastener 12 matched with the anchoring connecting seat 11, so as to provide rough limiting when placing the prefabricated track single plate, after the spatial position of the prefabricated track single plate 4 is finely adjusted by using the height adjusting washer 10 in step S4, the relative position of the limiting block 13 and the anchoring connecting seat 11 is locked by using the connecting fastener 12 in step S5 operation, so as to fix the limiting device on the pile cap and also lock the position of the prefabricated track single plate 4. The remaining operations are basically the same and will not be repeated here. It should be particularly pointed out that if the pile cap is prefabricated in step S1, the limiting device adopts the limiting block detachable with the pile cap, then the structure of the pile cap is simpler, the appearance is more standardized, and the construction, transportation and storage are more convenient.

[0056] Example four

[0057] As Figure 6 and Figure 7The utility model discloses a pile platform support type floating track bed, and the difference with example three lies in, the prefabricated track single board 4 is erected on the two non-adjacent bearing platforms 3 of spacing a bearing platform in the direction of steel rail extension, that is, three bearing platforms 3 are matched with each prefabricated track single board 4 below, and the elastic vibration isolation device 1 is set respectively on each bearing platform 3 and carries out elastic support to prefabricated track single board, in addition, the limiting device is composed of the limiting protrusion 5 of the integral setting with bearing platform 3 and detachable limiting block 13, and the limiting protrusion 5 and limiting block 13 are correspondingly set on the both sides of the board end of prefabricated track single board 4, wherein, limiting block 13 and anchoring connecting seat 11 are fixedly connected through connecting fastener 12, and the gap between limiting block 13 and prefabricated track single board 4, the gap between limiting protrusion 5 and prefabricated track single board 4 and the board end of adjacent prefabricated track single board 4 is filled with the elastic layer of the curable elastic polyurethane material in situ as the elastic buffer structure 6, in addition, the elastic vibration isolation device 1 is specifically rubber vibration isolator, the vibration isolator limiting structure is specifically the limiting groove set respectively on prefabricated track single board 4 and bearing platform 3 corresponding to the elastic vibration isolation device 1, and the top and bottom of the elastic vibration isolation device are embedded in the limiting groove, in order to prevent water accumulation, the top surface of bearing platform inside two limiting protrusions 5 is higher than the top surface of bearing platform outside limiting protrusion 5, and the bottom surface of limiting groove is also not lower than the surface of bearing platform outside limiting protrusion 5, and limiting groove keeps open at least partially in the direction of steel rail extension to facilitate drainage.

[0058] Compared with example three, in the technical scheme of the example, the two ends of the prefabricated track single board are erected on the two non-adjacent bearing platforms in the direction of steel rail extension, and are matched with three bearing platforms, the size of the single prefabricated track single board can be longer, and the weight can be heavier, which is beneficial to improve the vibration reduction effect and improve the construction efficiency, of course, based on this technical principle, in actual engineering application, the prefabricated track single board can also span two or more bearing platforms, that is, simultaneously matched with four or more bearing platforms, which is also within the protection scope of the utility model; the limiting groove is set on the prefabricated track single board and the bearing platform corresponding to the elastic vibration isolation device, which is better for limiting the horizontal direction of the elastic vibration isolation device; the elastic layer of the curable elastic polyurethane material is used to cast in situ as the elastic buffer structure, which is better for the adaptability of the asymmetric gap and is more closely matched and safe and reliable.

[0059] Compared with the embodiment three, the pile cap supporting type floating track bed in the utility model is in the construction process, in the step S6 operation, the connecting fastener 12 is used to fix the limiting block 13 and the anchoring connecting seat 11, the limiting device is fixed on the bearing platform, and then the elastic layer is poured in the gap between the limiting block 13 and the prefabricated track single plate 4, the gap between the limiting block 5 and the prefabricated track single plate 4 and the gap between the plate ends of adjacent prefabricated track single plates 4, respectively, and the elastic layer is used as the elastic buffer structure 6, so that the locking of the prefabricated track single plate 4 position is realized. The remaining steps are basically the same, and will not be repeated here.

[0060] It is particularly pointed out that, based on the technical principles described in the example and the foregoing embodiments of the utility model, the length of the prefabricated track plate in the utility model can be designed according to engineering needs. In order to facilitate the arrangement of the fastener, generally, the length of the prefabricated track plate is 2-40 times the standard spacing of the rail fastener. The standard spacing of the rail fastener in the current urban rail transit field is 0.6mm, so the length of the prefabricated track plate is 1.2m, 1.8m, 2.4m……, and the longest can be 24m. Of course, the design of the length of the plate also takes into account the gap between the plates, and the actual product size should be slightly smaller. As shown in Figure 1 The prefabricated track plate is erected on the adjacent two bearing platforms, and at this time, the prefabricated track plate can be designed to be shorter, for example, 1.2m, 1.8m, 2.4m, etc. That is, the center distance between the adjacent two bearing platforms is generally not less than 1.2m. Based on this principle, the prefabricated track plate in the example cooperates with the three bearing platforms, and the length of the prefabricated track plate should be controlled to be 2.4m or more. Considering the vibration reduction effect, construction cost, overall integrity of the track bed structure and other factors, in actual application, the length of the typical prefabricated track plate is generally 2.4m or more, to control the number of pile columns and the number of bearing platforms, and thus control the construction cost. Since the length combination of the prefabricated track plate can be various in engineering application, only the text is given here, and the drawings are not repeated, all of which are within the protection scope of the utility model. The above description is also applicable to other embodiments of the utility model, and is described here, and will not be repeated.

[0061] Embodiment five

[0062] As Figure 8 And Figure 9The utility model pile platform support type floating track bed with the embodiment four is different, prefabricated track frame board 24 is prefabricated track single board and connecting beam integrated prefabricated, two prefabricated track single boards in prefabricated track frame board 24 are arranged respectively corresponding two rails of the same track line, and the two ends of prefabricated track frame board along the extension direction of the rail are respectively erected on the two adjacent bearing platforms 3, the limiting device is the limiting post 14 integrated in the middle of bearing platform 3, and the connecting beam of prefabricated track frame board 24 is provided with limiting gap matched with limiting post 14, and the elastic layer formed by pouring and solidification is arranged between limiting gap and limiting post as elastic buffer structure 6, in addition, in order to improve the integrity, shear hinge is further included, the shear hinge is specifically side-mounted shear plate 15, anchor connecting bolt 16 is used to fix side-mounted shear plate 15 at the end of adjacent prefabricated track frame board 24 respectively, and the adjacent prefabricated track frame board 24 is connected together through shear hinge, so that the plate end of adjacent prefabricated track frame board 24 always keeps vertical displacement synchronization.

[0063] Compared with the embodiment four, since prefabricated track frame board is adopted, the integrity of prefabricated track board and track bed structure in the technical scheme is better, and construction is more fast and efficient, especially after the prefabricated track frame board is connected through shear hinge, the integrity of track bed structure is stronger, which is conducive to further improving the damping effect and system stability, and is more safe and reliable, in addition, the limiting post can be used to realize reliable limiting of prefabricated track frame board in the rail transverse direction and longitudinal direction, and the overall structure is simpler, in addition, the top surface height of bearing platform 3 is higher than the surface of foundation 7 as a whole, and the bottom surface height of limiting groove on bearing platform 3 is also not lower than the surface of foundation 7, and the opening gap is further arranged on the peripheral sidewall of limiting groove, so that the influence of accumulated water on the damping effect can be effectively avoided.

[0064] The utility model pile platform support type floating track bed can be constructed according to the following steps:

[0065] S1, pile column 2 and bearing platform 3 are constructed, specifically, pile column 2 is fixed by piling, the reinforcement cage of pile column 2 is fixed and connected with bearing platform 3, then the formwork is erected and bearing platform 3 and pile column 2 are poured into an integrated body by using concrete, and after curing, the earthwork is backfilled, wherein the limiting post 14 is integrally poured and formed with bearing platform 3 synchronously;

[0066] S2, the elastic vibration isolation device 1 is placed on the bearing platform 3 according to the position coordinates;

[0067] S3, the prefabricated track board is placed on the elastic vibration isolation device 1, and the prefabricated track board is specifically prefabricated track frame board 24;

[0068] S4, the spatial position of prefabricated track frame board 24 is fine-adjusted by using height-adjusting gasket 10 according to the position coordinates;

[0069] S5, pouring the curable elastic layer between the limiting gap on the prefabricated track frame plate 24 and the limiting column 14 to form the elastic buffer structure 6, and locking the position of the prefabricated track frame plate 24;

[0070] S6, installing the fastener 9 on the prefabricated track frame plate 24, laying the steel rail 8, and adjusting the fastener 9 to make the position accuracy of the steel rail 8 meet the design requirements;

[0071] The shear hinge is installed, the side-mounted shear plate 15 is fixed on the end of the adjacent prefabricated track frame plate 24 by the anchor connecting bolt 16, and then the adjacent prefabricated track frame plates 24 are connected together through the shear hinge;

[0072] S7, the construction of the floating track bed structure is completed.

[0073] It should be noted that in the description, the side-mounted shear plate is taken as an example to describe the use of the shear hinge. In actual application, various shear hinges can be used in the present application, such as the upper-mounted shear hinge, the clamping shear hinge, the middle-mounted shear hinge, etc. In addition, the prefabricated track frame plate can be prefabricated in an integrated manner or can be prefabricated and assembled by the prefabricated track single plate and the connecting beam. In addition, in engineering, the prefabricated track frame plate can be erected on two adjacent bearing platforms or on two non-adjacent bearing platforms (i.e., the prefabricated track frame plate is used in cooperation with three or more bearing platforms). These are simple changes based on the technical principles of the present application and can achieve good technical effects. They are all within the protection scope of the present application.

[0074] Example six

[0075] As shown in Figure 10 and Figure 11 The pile platform supporting floating track bed of the present application is different from that of example five in that the elastic vibration isolation device is a steel spring damping vibration isolator which supports the end of the adjacent two prefabricated track frame plates 24. The steel spring damping vibration isolator comprises an upper shell 20, a spiral steel spring 21 and a lower shell 19. The damping material 22 is arranged in the lower shell 19, and the spiral steel spring 21 is partially arranged in the damping material 22. The upper shell is provided with threaded connection holes corresponding to the adjacent prefabricated track frame plates 24 which it supports. The prefabricated track frame plate 24 is provided with a connecting pipe frame 17 corresponding to the threaded connection hole. The connecting pipe frame 17 is provided with an assembly clearance hole and a connecting screw 18. The connecting screw 18 passes through the assembly clearance hole and cooperates with the threaded connection hole to fix and connect the prefabricated track frame plate 24 and the steel spring damping vibration isolator. Four connecting screws 18 are arranged corresponding to each steel spring damping vibration isolator.

[0076] Compared with example five, in the technical solution described in this example, the steel spring damping vibration isolator is used as the elastic vibration isolation device, which can achieve better damping effect, and the damping performance of the track bed system is greatly improved. In addition, the steel spring damping vibration isolator supports the end of the two adjacent prefabricated track frame plates at the same time, and the prefabricated track frame plate 24 is fixedly connected with the steel spring damping vibration isolator by the connecting screw 18. On the one hand, the number of elastic vibration isolation devices involved in the track bed system is smaller, which is conducive to improving the installation efficiency. On the other hand, in this track bed system, the upper shell 20 of the steel spring damping vibration isolator is connected with the connecting screw 18 and the two adjacent prefabricated track frame plates 24 at the same time. The upper shell 20 also plays a role of shear hinge. Through design and calculation, the thickness and strength of the steel plate of the upper shell 20 can be controlled to smoothly realize the shear force transmission between the adjacent prefabricated track frame plates during the operation of the railway vehicle through the steel spring damping vibration isolator, without the need to additionally set a shear hinge. Since the upper shell 20 is at the bottom of the prefabricated track frame plate 24, the force point is very low, the stress of the prefabricated track frame plate 24 is more reasonable, which can effectively prevent the prefabricated track frame plate from local fatigue damage, and is conducive to simplifying the structure of the track bed system, improving the service life of the track bed system, and reducing the workload of later maintenance. In the construction process, compared with the steps described in example five, in this example, the prefabricated track frame plate 24 is fixedly connected with the steel spring damping vibration isolator by the connecting screw 18 passing through the assembly gap hole and the threaded connection hole in step S5 to lock the position of the prefabricated track frame plate 24. The rest of the construction process is basically the same and will not be repeated here.

[0077] In this example, Figure 10 In this example, four connecting screws are used to connect the prefabricated track frame plate with the steel spring damping vibration isolator through the threaded connection hole. In actual application, the number of connecting screws can be two, six or even more, which can be designed and selected according to engineering needs. In addition, the damping material in the steel spring damping vibration isolator can be solid damping material or liquid damping material, which can be designed and selected according to engineering needs.

[0078] Example seven

[0079] As Figure 12 and Figure 13The utility model pile platform support type floating track bed with the difference that the embodiment six lies in, prefabricated track slab adopts conventional solid prefabricated track slab 25, in addition, the spacing groove set up on prefabricated track slab 25 is also kept open along the rail transverse outward side, the steel spring damping vibration isolator can be pushed in from the outside to the inside along the spacing groove outside prefabricated track slab when assembling, after using heightening washer 10 respectively to the adjacent two prefabricated track slab 25 that support heightening and leveling operation, then using connecting screw rod 18 with the threaded connection hole set up on upper shell 20 cooperation fixes prefabricated track slab 25 with steel spring damping vibration isolator, wherein, two connecting screw rods 18 are set up corresponding to each steel spring damping vibration isolator, in addition, the vibration isolator spacing structure set up on the pile cap 3 in this example is spacing fastening connecting piece, and the spacing fastening connecting piece is specifically anchor bolt 23, after prefabricated track slab 25 and steel spring damping vibration isolator fixed connection, using anchor bolt 23 fixes the lower shell 19 of steel spring damping vibration isolator with the pile cap 3, further, the spacing device includes two spacing columns 14 set up on the pile cap 3 corresponding to the adjacent two prefabricated track slabs, and the spacing column 14 is integrally arranged with the pile cap 3, and the spacing through hole is set up on prefabricated track slab 25 corresponding to the spacing column 14, and the elastic layer that is poured and solidified is arranged as the elastic buffer structure 6 in the clearance between the spacing column 14 and the spacing through hole, fifth, the bare hole 26 that goes through up and down is set up on prefabricated track slab 25 as the assembly allowance hole.

[0080] Compared with the embodiment six, in the technical solution of the example, the lower shell 19 of the steel spring damping vibration isolator is fixedly connected with the pile cap 3, on the one hand, the pile cap does not need to be additionally provided with a spacing groove, and the structure of the pile cap can be simpler and more convenient to process, on the other hand, during maintenance, the connecting screw rod 18 is removed and the anchor bolt 23 is loosened, the steel spring damping vibration isolator can be pulled out, after maintenance, the steel spring damping vibration isolator can be pushed in again and fixed, which is very convenient. In addition, the prefabricated track slab in the example adopts a conventional prefabricated track slab, which has better integrity and structural strength and greater vibration mass, and is conducive to achieving better vibration reduction effect. In addition, the bare hole 26 is used as the assembly allowance hole in the example, so that fewer elements are involved and the structure is simpler.

[0081] The utility model pile platform support type floating track bed in the construction process of the example, the difference that the embodiment six lies in, in step S5, the lower shell 19 of the steel spring damping vibration isolator is fixedly connected with the pile cap 3 by using anchor bolt 23, and the rest is basically the same, which will not be repeated here. In addition, the spacing column and the spacing through hole are used to limit each prefabricated track slab in the example, and the horizontal spacing effect is more reliable.

[0082] It should be noted that based on the technical principles of the present example and the foregoing embodiments, the specific form of the vibration isolator limiting structure provided on the pile cap and / or the prefabricated track slab in the present utility model can be various, which can be a limiting groove, a limiting protrusion, a limiting fastening connector or a limiting piece fixed by a fastener, etc., all of which can achieve the technical effect of limiting the elastic vibration isolation device in the horizontal direction, and can be used in the present utility model. Here, the description is given in words, and the drawings are not described one by one, all of which are within the protection scope required by the present utility model.

[0083] Example Eight

[0084] As Figure 14 and Figure 15 The pile cap supporting type floating track bed of the present utility model is different from that of example six in that it further comprises a counter-pressure device, the counter-pressure device comprises a counter-pressure connecting piece 27, a counter-pressure disc 28 and an anchoring piece 29, the anchoring piece 29 is fixedly arranged on the pile cap 3, the lower end of the counter-pressure connecting piece 27 is connected with the anchoring piece 29 through a threaded structure, and the upper end of the counter-pressure connecting piece 27 is matched with the counter-pressure disc 28 to press the counter-pressure disc 28 tightly on the top surface of the prefabricated track frame slab 24.

[0085] In construction, the pile cap supporting type floating track bed of the present utility model can be operated according to the following steps:

[0086] S1, the pile column 2 and the pile cap 3 are constructed, specifically, the pile column 2 is fixed by piling, the steel reinforcement cage of the pile column 2 is fixedly connected with the pile cap 3, the formwork is then erected and the pile cap 3 and the pile column 2 are integrally poured with concrete, and after curing, the earthwork is backfilled, wherein the limiting column 14 is integrally poured and formed with the pile cap 3 at the same time;

[0087] S2, the elastic vibration isolation device 1 is placed on the pile cap 3 according to the position coordinates;

[0088] S3, the prefabricated track slab, specifically the prefabricated track frame slab 24, is placed on the elastic vibration isolation device 1;

[0089] S4, the spatial position of the prefabricated track frame slab 24 is finely adjusted by using the height-adjusting gasket 10 according to the position coordinates;

[0090] S5, the prefabricated track frame slab 24 is fixedly connected with the steel spring damper isolator by using the connecting screw rod 18 to pass through the assembly gap and cooperate with the threaded connection hole, the limiting gap on the prefabricated track frame slab 24 and the limiting column 14 are poured with a curable elastic layer to form an elastic buffer structure 6, and the position of the prefabricated track frame slab 24 is locked;

[0091] S6, the fastener 9 is installed on the prefabricated track frame slab 24, the steel rail 8 is laid, and the fastener 9 is adjusted to make the position accuracy of the steel rail 8 meet the design requirements;

[0092] The counter-pressure device is installed, and the counter-pressure connecting piece 27 is connected with the anchor 29 to press the counter-pressure disc 28 on the top surface of the prefabricated track frame plate 24.

[0093] S7, the construction of the floating track bed structure is completed.

[0094] Compared with example six, in the technical solution of the example, the counter-pressure device is additionally arranged, the lifting of the prefabricated track plate in the vertical direction of the rail is effectively constrained without affecting the vibration isolation performance of the track bed structure. During the driving of the rail vehicle, the displacement of the prefabricated track plate in the vertical direction of the rail changes little during the load transmission from one end of the prefabricated track plate to the other end, the elastic element in the elastic vibration isolation device can be effectively prevented from bouncing and falling due to pressure change, the whole track bed system is more stable, safe and reliable. Of course, in the example, four counter-pressure devices are arranged on one prefabricated track plate corresponding to four corner portions, and more counter-pressure devices can be arranged in actual application. In engineering application, the counter-pressure devices can be designed and used according to the actual needs of the project. In general, the counter-pressure devices at each end of the prefabricated track plate are preferentially arranged symmetrically. This is only described in words and not described in another drawing, and is also within the protection scope of the utility model.

[0095] Example nine

[0096] As shown in Figure 16 and Figure 17 The pile cap supporting type floating track bed of the utility model is different from example five in that the prefabricated track plate is a conventional solid prefabricated track plate 25. In addition, the counter-pressure device is arranged, the counter-pressure device comprises a counter-pressure connecting piece 27, a counter-pressure disc 28 and an anchor 29, the anchor 29 is fixedly arranged on the pile cap 3, the lower end of the counter-pressure connecting piece 27 is connected with the anchor 29 through a threaded structure, and the upper end of the counter-pressure connecting piece 27 is connected with the counter-pressure disc 28 to press the counter-pressure disc 28 on the top surface of the prefabricated track plate 25.

[0097] Compared with the construction method of example five, the pile cap supporting type floating track bed of the utility model can be constructed according to the following steps:

[0098] S1, the pile column 2 and the pile cap 3 are constructed, specifically, the pile column 2 is fixed by piling, the steel reinforcement cage of the pile column 2 and the pile cap 3 is fixed and connected, the formwork is erected, and the pile cap 3 and the pile column 2 are integrally poured with concrete, and the soil is backfilled after curing. The limiting column 14 is integrally poured and formed with the pile cap 3 at the same time;

[0099] S2, the elastic vibration isolation device 1 is placed on the pile cap 3 according to the position coordinates;

[0100] S3, the prefabricated track plate is placed on the elastic vibration isolation device 1, and the prefabricated track plate is specifically a prefabricated track plate 25;

[0101] S4, according to the position coordinates, the spatial position of the prefabricated track slab 25 is fine adjusted by using the height adjusting shims 10;

[0102] S5, the elastic layer is poured between the limiting notch on the prefabricated track slab 25 and the limiting column 14 to form an elastic buffer structure 6, and the position of the prefabricated track slab 25 is locked;

[0103] S6, the fastener 9 is installed on the prefabricated track slab 25, the steel rail 8 is laid, and the position accuracy of the steel rail 8 is adjusted to meet the design requirements;

[0104] The shear hinge is installed, the side-mounted shear plate 15 is fixed on the end of the adjacent prefabricated track slab 25 by using the anchoring connecting bolt 16, and the adjacent prefabricated track slab 25 is connected together through the shear hinge;

[0105] The counter-pressure device is installed, the counter-pressure connecting piece 27 is connected with the anchoring piece 29 in cooperation, and the counter-pressure disc 28 is pressed tightly on the top surface of the prefabricated track slab 25;

[0106] S7, the construction of the floating track bed structure is completed.

[0107] Compared with example five, in the technical scheme of the example, the prefabricated track slab in the example adopts a conventional prefabricated track slab, the integrity and structural strength of the prefabricated track slab are better, the vibration mass is larger, and better vibration reduction effect can be achieved. In addition, the counter-pressure device is additionally arranged, the lifting of the prefabricated track slab in the vertical direction of the steel rail is effectively constrained without affecting the vibration isolation performance of the track bed structure. During the driving of the track vehicle, the displacement of the prefabricated track slab in the vertical direction of the steel rail changes little during the transmission of the load from one end of the prefabricated track slab to the other end, the elastic elements in the elastic vibration isolation device can be effectively prevented from bouncing and falling due to pressure changes, the track bed system is more stable and safe and reliable. Of course, in the example, four counter-pressure devices are arranged on one prefabricated track slab corresponding to four corner portions, and more counter-pressure devices can be arranged in actual application. The counter-pressure devices can be designed and used according to the actual needs of the project. In general, the counter-pressure devices at each end of the prefabricated track slab are preferentially arranged symmetrically, which is only described in words and not described in another drawing, and also falls within the protection scope of the utility model.

[0108] The embodiments in the utility model are only used to better illustrate the technical scheme of the utility model, and should not be regarded as a limitation of the utility model. The technical features in many embodiments can be cross-used, based on the technical principle of the utility model, the technical scheme described in the above embodiments can be combined or some elements can be simply replaced by similar technologies, as long as the technical principle of the utility model is based on, and all falls within the protection scope of the utility model.

Claims

1. A pile-supported floating track bed comprising elastic vibration isolation means, characterised in that, The pile, the pile cap, the prefabricated track slab and the limiting device arranged on the pile cap for limiting the prefabricated track slab in the horizontal direction are further included, the pile cap is fixed on the top of the pile, the pile is at least partially embedded in the foundation, the pile and the pile cap are arranged at intervals along the extension direction of the steel rail, the limiting device is fixed on the pile cap or arranged integrally with the pile cap, the two ends of the prefabricated track slab along the extension direction of the steel rail are respectively arranged on two adjacent or non-adjacent pile caps, and the elastic vibration isolation device is arranged between the prefabricated track slab and the pile cap.

2. A pile supported floating track bed as claimed in claim 1, wherein, The limiting device includes a limiting column or a limiting protrusion arranged integrally on the pile cap or a limiting piece fixed and connected with the pile cap through a connecting fastener.

3. A pile supported floating track bed as claimed in claim 2, wherein, A limiting gap or a limiting through hole is arranged on the plate body of the prefabricated track slab and corresponds to the limiting device.

4. The pile-supported floating track bed of claim 2, wherein, An elastic buffer structure is arranged between the limiting device and the prefabricated track slab, and the elastic buffer structure includes an elastic pad or an elastic layer formed by pouring and solidification.

5. The pile-supported floating track bed of claim 1, wherein, The pile and the pile cap are independently arranged corresponding to each steel rail of the track line, or two steel rails of the same track line share one pile cap.

6. A pile supported floating track bed as claimed in claim 5 wherein, The prefabricated track slab is composed of a prefabricated track single slab, the prefabricated track single slab is arranged corresponding to each steel rail, and the two ends of the prefabricated track single slab along the extension direction of the steel rail are respectively arranged on two adjacent or non-adjacent pile caps.

7. A pile supported floating track bed as claimed in claim 5 wherein, The prefabricated track slab is a prefabricated track frame slab, the prefabricated track frame slab is integrally prefabricated or prefabricated and assembled by a prefabricated track single slab and a connecting beam, two prefabricated track single slabs in the prefabricated track frame slab are respectively arranged corresponding to two steel rails of the same track line, and the two ends of the prefabricated track frame slab along the extension direction of the steel rail are respectively arranged on two adjacent or non-adjacent pile caps.

8. A pile supported floating track bed according to claim 6 or 7, characterised in that, The end portions of the prefabricated track single slab are provided with round corners or inward chamfers.

9. The pile-supported floating track bed of claim 1, wherein, The elastic vibration isolation device includes a rubber damping pad, a polyurethane damping pad, a metal rubber composite vibration isolator, a rubber vibration isolator or a steel spring damping vibration isolator.

10. The pile-supported floating track bed of claim 1, wherein, A vibration isolator limiting structure for limiting the elastic vibration isolation device in the horizontal direction is arranged on the pile cap and / or the prefabricated track slab corresponding to the elastic vibration isolation device, and the vibration isolator limiting structure includes a limiting groove, a limiting protrusion, a limiting piece fixed by a fastener or a fastener.

11. A pile supported floating track bed as claimed in claim 1 wherein, An adjusting gasket is arranged between the elastic vibration isolation device and the prefabricated track slab.

12. The pile-supported floating track bed of claim 1, wherein, The elastic vibration isolation device simultaneously supports the end portions of two adjacent prefabricated track slabs.

13. A pile supported floating track bed as claimed in claim 12 wherein, The elastic vibration isolation device includes an upper shell, a spiral steel spring and a lower shell, a damping material is arranged in the lower shell, the spiral steel spring is partially arranged in the damping material, the upper shell is provided with a threaded connection hole corresponding to the adjacent prefabricated track slab supported and matched, a fitting allowance hole and a connecting screw are arranged on the prefabricated track slab corresponding to the threaded connection hole, and the connecting screw is fixed and connected with the prefabricated track slab through the fitting allowance hole and the threaded connection hole.

14. The pile-supported floating track bed of claim 1, wherein, The pile cap supporting type floating track bed further includes a shear hinge, adjacent prefabricated track slabs are connected together through the shear hinge, and the plate ends of the adjacent prefabricated track slabs always keep vertical displacement synchronization.

15. The pile-supported floating track bed of claim 1, wherein, The pile cap bearing type floating track bed further comprises a counter pressure device, which comprises a counter pressure connecting piece, a counter pressure disc and an anchor, the anchor is fixedly arranged on the bearing cap, the lower end of the counter pressure connecting piece is connected with the anchor, and the upper end of the counter pressure connecting piece is matched with the counter pressure disc to press the counter pressure disc tightly on the prefabricated track plate.

16. The pile-supported floating track bed of claim 1, wherein, The length of the prefabricated track plate is 2-40 times of the standard interval of the rail fastening.

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