Point-supported precast floating slab track and its construction method

Abstract

The present invention provides a point-supported precast floating slab track and its construction method. The steps of the construction method include benchmark surveying and setting, base construction, inspection and adjustment of the isolator installation surface, isolator installation, laying of precast floating slabs, installation of rails and fasteners, and construction of limit bosses. Among them, since the isolator adopts a structure with an initial height-adjusting gasket arranged between the base and the elastic component, the outer sleeve of the isolator is no longer provided in the precast floating slab. Instead, a bearing plate is embedded at the bottom of the slab, and a structure with the elastic component placed outside is adopted. Moreover, in the construction, a method of first detecting and adjusting the installation height of each isolator and then laying the precast floating slab is used. Therefore, it is possible to avoid jacking the precast floating slab multiple times for installing and adjusting the isolator like the traditional construction method, forming a "direct laying" construction method without jacking, greatly simplifying the process of the point-supported precast floating slab track and improving the construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of rail transit vibration and noise reduction, and particularly relates to a point-supported precast floating slab track and a construction method thereof. Background Art

[0002] With the development of rail transit vibration and noise reduction technology, various forms of vibration reduction track systems have emerged, and standards for multi-level vibration reduction requirements have been set according to the characteristics of each section and the actual vibration reduction requirements. Currently, for the highest-level special vibration reduction requirements, point-supported floating slab tracks are usually adopted. The track structure includes a base, multiple vibration isolators, a precast track slab, rails, fasteners, etc. The precast track slab contacts the base in a point-supported form through multiple vibration isolators, and the vibration generated when the train passes can be reduced from being transmitted to the base through multiple vibration isolators, achieving a good vibration isolation effect. Among them, an outer sleeve for supporting the vibration isolator is embedded in the precast track slab. Currently, such point-supported precast floating slab tracks all adopt the construction method of "laying the slab first and then jacking up". The construction process is as follows: benchmark setting → foundation steel bar binding → foundation concrete pouring → precast slab transportation and rough laying → fastener installation → rail transportation and installation → precast slab jacking → limit boss pouring → track fine adjustment. In the above construction method, the "rail erection method" construction process is adopted in the jacking stage to make the precast track slab reach the designed position. The jacking steps are as follows: longitudinally and transversely install lateral hydraulic jacks to adjust the longitudinal and transverse directions → install horizontal limiters → place vibration isolators → install and fix the jacking equipment in the outer sleeve of the jacking layer to jack up the precast slab → rotate the vibration isolator to make the bearing claw pad under the bearing layer inside the outer sleeve → the fine adjustment trolley collects the rail surface data → perform subsequent jacking according to the measurement data until the precast track slab reaches the designed position.

[0003] For example, CN116516731A discloses a construction method of such a point-supported precast floating straight slab track, in which the "one jacking and one isolation" method is adopted to alternately use some outer sleeves to jack up the precast track slab, and vibration isolators are installed at the other outer sleeves. Therefore, two jackings are required to complete the installation of all vibration isolators in a precast track slab, and usually two to three more jackings are required to adjust the installation height of the vibration isolators (i.e., the elevation of the precast track slab at the corresponding position) after the installation is completed. It can be seen that there are relatively many operations of jacking up the precast track slab during the construction process, the procedures are cumbersome and time-consuming, resulting in low construction efficiency.

[0004] In addition, in most of such current tracks, the elastic components of the vibration isolators are hidden inside the outer sleeve, making it impossible to directly judge the stress state of the elastic components, and there is a phenomenon that some elastic components are suspended, resulting in uneven track conditions in the later stage, and the track fine adjustment needs to be carried out again by sacrificing the adjustment amount of the fasteners, causing the problem of reduced adjustment space for later operation and maintenance. Summary of the Invention

[0005] The present invention is made to solve the above problems, and aims to provide a point-supported precast floating slab track with more convenient and faster construction and higher construction quality, as well as a corresponding construction method. The present invention adopts the following technical solutions:

[0006] The present invention provides a construction method for a point-supported precast floating slab track, which has the following technical features and includes the following steps: Step S1, performing benchmark survey in a predetermined construction section; Step S2, performing base construction according to the benchmarks in the predetermined construction section; Step S3, detecting and adjusting the inclination of multiple predetermined vibration isolator mounting surfaces on the top surface of the base, and performing elevation detection of the base; Step S4, respectively arranging vibration isolators on each of the vibration isolator mounting surfaces; Step S5, laying multiple precast floating slabs on the multiple vibration isolators, and finely adjusting the laying positions of the precast floating slabs; Step S6, installing rails on the multiple precast floating slabs to form a point-supported precast floating slab track. Among them, the vibration isolator includes one or more initial height-adjusting gaskets and an elastic component. In Step S4, the initial height-adjusting gasket and the elastic component are sequentially arranged on the vibration isolator mounting surface, and the current elevation at the vibration isolator is detected. When the current elevation does not meet the standard, the initial height-adjusting gasket is adjusted or replaced according to the deviation between the current elevation and the predetermined elevation.

[0007] The construction method for the point-supported precast floating slab track provided by the present invention may also have the following technical feature, wherein in Step S5, a quick-adjustment benchmark frame is arranged on the precast floating slab. The quick-adjustment benchmark frame has multiple prisms. The coordinates of the multiple prisms are measured by a total station to obtain the lateral position data and longitudinal position data of the precast floating slab during the laying process, and the laying position of the precast floating slab is finely adjusted according to the deviation between the lateral position data, the longitudinal position data and the corresponding predetermined positions.

[0008] The construction method for the point-supported precast floating slab track provided by the present invention may also have the following technical feature, wherein in Step S5, the theoretical three-dimensional line type parameters of the line corresponding to the point-supported precast floating slab track are imported into the floating slab fine-adjustment software. The floating slab fine-adjustment software outputs the section slab layout plan of the predetermined construction section, including the number of precast floating slabs and the predetermined position data of each precast floating slab. During the laying process, according to the deviation between the measured lateral position data, longitudinal position data and the corresponding predetermined position data, a lateral strut is used to control the lateral position and longitudinal position of the precast floating slab during the slab-laying process, so as to finely adjust the laying position of the precast floating slab.

[0009] The construction method of the point-supported precast floating slab track provided by the present invention may further have the following technical features: in step S1, vibration isolator position control piles are respectively arranged on both sides of the predetermined base position in the predetermined construction section to mark the position of the vibration isolator installation surface on the top surface of the base. In step S3, a tilt detection and adjustment device is used to detect and adjust the tilt angle of the vibration isolator installation surface in the initial setting state. The tilt detection and adjustment device includes: a laser marking instrument for laser marking the vibration isolator position control piles to position the vibration isolator installation surface; an angle sensor for detecting the tilt angle of the vibration isolator installation surface; a digital display component for displaying angle data corresponding to the tilt angle measured by the angle sensor; and an adjustment chassis for contacting the vibration isolator installation surface and pressing it when adjustment is required. The positions of the laser marking instrument and the angle sensor are fixed relative to the adjustment chassis.

[0010] The construction method of the point-supported precast floating slab track provided by the present invention may further have the following technical features: step S3 includes the following sub-steps: step S3-1, according to the vibration isolator position control piles, place the tilt detection and adjustment device on the top surface of the base and make the bottom surface of its adjustment chassis fit the top surface of the base; step S3-2, use the laser marking instrument to laser mark the vibration isolator position control piles and adjust the position of the adjustment chassis on the top surface of the base until the laser marking coincides with the vibration isolator position control piles, so that the adjustment chassis is placed on the vibration isolator installation surface; step S3-3, use the angle sensor to detect the tilt angle of the vibration isolator installation surface and judge whether the tilt angle of the vibration isolator installation surface meets the predetermined angle requirement according to the angle data displayed by the digital display component; step S3-4, when the judgment in step S3-3 is no, confirm the adjustment range and adjustment angle according to the deviation between the measured tilt angle and the predetermined angle requirement; step S3-5, according to the adjustment range and the adjustment angle, use the adjustment chassis to press the vibration isolator installation surface accordingly.

[0011] The construction method of the point-supported precast floating slab track provided by the present invention may further have the following technical features: the precast floating slab has a plurality of vibration isolator inspection holes and drain inspection holes. After construction is completed, the plurality of vibration isolator inspection holes are respectively located above each vibration isolator, and the drain inspection hole is located above the central drain of the base. The precast floating slab is a concrete slab, and the vibration isolator inspection holes and the drain inspection holes are formed by a demolding process.

[0012] The construction method of the point - supported precast floating slab track provided by the present invention may further have the following technical features. The preparation method of the precast floating slab includes the following steps: Step SA1, respectively manufacture the preparation molds for the vibration isolator inspection holes and the drainage ditch inspection holes according to the design requirements of the precast floating slab; Step SA2, fix the preparation mold for the vibration isolator inspection hole and the preparation mold for the drainage ditch inspection hole in the slab mold of the precast floating slab respectively according to the designed positions of the vibration isolator inspection hole and the drainage ditch inspection hole; Step SA3, set release agents on the outer surfaces of the preparation mold for the vibration isolator inspection hole and the preparation mold for the drainage ditch inspection hole respectively; Step SA4, install the steel bar framework into the slab mold; Step SA5, pour concrete into the slab mold to form a slab body combined with the preparation mold for the vibration isolator inspection hole and the preparation mold for the drainage ditch inspection hole; Step SA6, when the strength of the concrete reaches the predetermined demolding requirement strength, first remove the slab mold, and then pull out the preparation mold for the vibration isolator inspection hole and the preparation mold for the drainage ditch inspection hole from the slab body respectively according to the corresponding predetermined draft angles; Step SA7, cure the demolded slab body to obtain the precast floating slab.

[0013] The present invention provides a point - supported precast floating slab track, which has the following technical features. It is obtained by the construction method of the point - supported precast floating slab track as described above. The supported precast floating slab track includes: a base; a plurality of vibration isolators respectively arranged on the base; and a plurality of precast floating slabs respectively arranged on the plurality of vibration isolators. Among them, the vibration isolator includes one or more initial height - adjusting gaskets and an elastic component. The initial height - adjusting gasket is arranged between the base and the vibration isolator and is used to adjust the elevation at the vibration isolator.

[0014] The point - supported precast floating slab track provided by the present invention may further have the following technical features. Strip - shaped grooves extending along the length direction are provided below both sides of the precast floating slab, such that the slab thickness in the middle of the width direction of the precast floating slab is greater than that at both ends. A load - bearing plate is embedded at the top surface of the strip - shaped groove. The vibration isolator is arranged in the strip - shaped groove and its top abuts against the load - bearing plate. The lower parts at both ends in the width direction of the precast floating slab form a mating surface inclined relative to the width direction.

[0015] The point - supported precast floating slab track provided by the present invention may further have the following technical features. The vibration isolator further includes one or a plurality of stacked split - type height - adjusting gaskets fixed on the top of the elastic component and used to adjust the elevation of the vibration isolator.

[0016] The present invention has the following functions and effects.

[0017] According to the point - supported precast floating slab track and its construction method provided by the present invention, the construction method steps at least include benchmark surveying and setting, base construction, inspection and adjustment of the isolator installation surface, isolator installation, laying of the precast floating slab, and installation of the rail. Among them, since the isolator adopts a structure with an initial height - adjusting gasket arranged between the base and the elastic component, and in the construction, the installation height of each isolator is first detected and adjusted, and then the precast floating slab is laid, it is possible to avoid jacking the precast floating slab multiple times to install and adjust the isolator as in the traditional construction method, forming a "direct - laying" construction method without jacking, greatly simplifying the process of the point - supported precast floating slab track and improving the construction efficiency. Description of the Drawings

[0018] Figure 1 It is a top - view schematic diagram of the point - supported precast floating slab track in an embodiment of the present invention.

[0019] Figure 2 It is a sectional schematic view of the point - supported precast floating slab track in an embodiment of the present invention Figure 1 .

[0020] Figure 3 It is a sectional schematic view of the point - supported precast floating slab track in an embodiment of the present invention Figure 2 .

[0021] Figure 4 It is a sectional schematic diagram of the precast floating slab in an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the demolding and forming of the isolator inspection hole in an embodiment of the present invention.

[0023] Figure 6 It is a flowchart of the preparation method of the precast floating slab in an embodiment of the present invention.

[0024] Figure 7 It is a structural schematic diagram of the isolator in an embodiment of the present invention.

[0025] Figure 8 It is Figure 7 an enlarged view of the part inside the frame A.

[0026] Figure 9 It is a flowchart of the construction method of the point - supported precast floating slab track in an embodiment of the present invention.

[0027] Figure 10 It is a three - dimensional schematic diagram of the inclination detection and adjustment device in an embodiment of the present invention.

[0028] Figure 11It is a schematic diagram of the usage state of the inclination detection and adjustment device in the embodiment of the present invention.

[0029] Figure 12 is Figure 11 an enlarged view of the part within circle B in

[0030] Figure 13 It is a flowchart of step S3 in the embodiment of the present invention.

[0031] Reference numerals:

[0032] Point-supported precast floating slab track 100; precast floating slab 10; slab center line 10A; slab main body 11; strip-shaped groove 112; groove top surface 112a; groove side surface 112b; vibration isolator inspection hole 113; vibration isolator support 114; load-bearing plate 1141; coupling member 1142; lateral opening 115; drainage ditch inspection hole 116; mating surface 117; relief channel 119; slab lower protrusion 12; bearing platform 13; boss mating groove 14; vibration isolator 20; elastic component 22; upper end plate 221; upper plate spring fixing hole 2211; upper plate gasket fixing hole 2212; lower end plate 222; lower plate spring fixing hole 2221; lower plate limit hole 2222; rubber spring 223; spring upper end 2231; spring main body 2232; spring lower end 2233; spring end fixing member 224; auxiliary fixing member 225; initial heightening gasket 23; gasket limit hole 231; horizontal limiting member 24; split heightening gasket 25; gasket fixing member 26; base 30; base top surface 31; vibration isolator installation surface 311; limiting member installation hole 32; base drainage ditch 33; vibration isolator position control pile 34; limiting boss 40; rail 50; slab end sealing strip 60; preparation mold for vibration isolator inspection hole 80; inclination detection and adjustment device 90; inclination detection part 91; digital display component 912; function key 913; positioning part 92; laser marking instrument assembly 921; base adjustment part 93; accommodation housing 931; hand-held handle 932; connecting column 933; adjustment base 934; adjustment chassis 9341; rotating chassis 9342; rotating bearing 9343; limiting component 9344; tunnel 200; arc-shaped tunnel wall 210. Detailed implementation manners

[0033] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the point-supported precast floating slab track and its construction method of the present invention will be specifically described below in conjunction with embodiments and drawings.

[0034] This embodiment provides a point-supported precast floating slab track and its construction method. For the convenience of description, the structure of the track will be specifically described first below, and then the corresponding specific construction method will be described in combination with the track structure.

[0035] Figure 1 It is a top view schematic diagram of the point - supported precast floating slab track in this embodiment. Figure 2 It is a sectional view schematic diagram of the point - supported precast floating slab track in this embodiment. Figure 1 , Figure 3 It is a sectional view schematic diagram of the point - supported precast floating slab track in this embodiment. Figure 2 , Figure 2 and Figure 3 respectively show the sectional structures at different positions in the track.

[0036] As Figures 1 to 3 shown, the point - supported precast floating slab track 100 includes multiple precast floating slabs 10 (also called track slabs), multiple vibration isolators 20, a base 30, multiple limit bosses 40, multiple steel rails 50, and multiple rail fasteners (not shown in the figure), etc. And, exemplarily, the point - supported precast floating slab track 100 is arranged in a tunnel 200, and the tunnel 200 has an arc - shaped tunnel wall 210. Figure 2 and Figure 3 respectively show the sectional structures of the track 100 arranged at the curved section of the tunnel 200.

[0037] Among them, the base 30 is a reinforced concrete base, usually cast at the track construction site. In the straight section, the top surface 31 of the base 30 is basically a horizontal plane. In the curved section, the top surface 31 of the base is a corresponding inclined plane. The middle part of the base 30 has an extended base drain 33.

[0038] The precast floating slab 10 is a concrete slab, pre - fabricated in a factory and transported to the track construction site for laying. Multiple precast floating slabs 10 are laid in sequence above the base 30. The length direction of each precast floating slab 10 is consistent with the track extension direction, and one end of the length directions of two adjacent precast floating slabs 10 is connected. In the straight section, the precast floating slab 10 is also arranged approximately horizontally above the base 30. In the curved section, the precast floating slab 10 is correspondingly arranged obliquely on the base 30, and is approximately parallel to the top surface 31 of the base.

[0039] Figure 4 It is a sectional view schematic diagram of the precast floating slab in this embodiment. Figure 2 and Figure 3 also show the sectional structure of the precast floating slab, Figure 1 and shows its upper surface structure.

[0040] As Figures 1 to 4 shown, the precast floating slab 10 includes an integrally formed plate main body part 11, a plate lower convex part 12, and multiple bearing platforms 13 (also called short sleepers).

[0041] Among them, the plate main body 11 is in the shape of a flat plate. In this embodiment, it is in the shape of a rectangular parallelepiped plate with corners missing at both lower sides in the width direction. The plate main body 11 is similar to the precast track slab used in the prior art for being arranged in a circular-bottom tunnel in terms of structure and size.

[0042] The plate lower convex part 12 protrudes downward from the middle part of the lower surface of the plate main body 11 (the middle part in the width direction). In this embodiment, the plate lower convex part 12 is generally in the shape of a rectangular parallelepiped plate, and its width and thickness are respectively smaller than the width and thickness of the plate main body 11. And the plate lower convex part 12 is vertically aligned with the center line in the width direction of the plate main body 11, so that the cross-section of the middle part of the precast floating slab 10 in the length direction is roughly in the shape of a flat T, and the plate thickness in the middle part in the width direction is greater than the plate thickness at both ends in the width direction.

[0043] A pair of strip-shaped grooves 112 are formed outside both sides of the plate lower convex part 12 and below both sides of the plate main body 11. The sizes of the pair of strip-shaped grooves 112 are the same, and they are arranged in mirror symmetry along the center line in the width direction of the precast floating slab 10. The cross-section of the strip-shaped grooves 112 in the length direction of the precast floating slab 10 is roughly in the shape of a flat rectangle.

[0044] The lower surfaces of both sides of the plate main body 11 are respectively the groove top surfaces 112a of the strip-shaped grooves 112 on both sides, and the side surfaces in the width direction of the plate lower convex part 12 are respectively the groove side surfaces 112b of the strip-shaped grooves 112 on both sides. In this embodiment, both the groove top surface 112a and the groove side surface 112b are planes and are perpendicular to each other, and the groove top surface 112a is also parallel to the upper surface of the plate main body 11 and the lower surface of the plate lower convex part 12.

[0045] The lower parts at both ends in the width direction of the plate main body 11 are corner-missing, forming a pair of mating surfaces 117. From the middle part in the width direction of the plate main body 11 to both ends in its width direction, the mating surface 117 slopes upward relative to this width direction, and its inclination angle corresponds to the arc-shaped tunnel wall 210.

[0046] A plurality of bearing platforms 13 (also called short sleepers) are respectively arranged on the upper surface of the plate main body 11, and are arranged in two rows along the length direction of the plate main body 11. The plurality of bearing platforms 13 in each row are arranged at equal intervals. Two steel rails 50 are respectively carried on the two rows of bearing platforms 13, and a rail fastening fitting is arranged on each bearing platform 13. The two steel rails 50 are respectively fixed by a plurality of rail fastening fittings. A reinforcing base plate, usually an iron base plate, is also arranged between the bearing platform 13 and the steel rail 50. Optionally, an elastic vibration damping base plate can also be arranged between the iron base plate and the bottom surface of the steel rail 50.

[0047] In this embodiment, the groove side surface 112b of the strip-shaped groove 112 is roughly located below the middle part of the corresponding bearing platform 13 on one side.

[0048] The plate main body 11 further has a plurality of vibration isolator inspection holes 113 and a plurality of vibration isolator supports 114. The vibration isolator inspection holes 113 are arranged between two adjacent bearing platforms 13 and are arranged close to the outer edge of the bearing platform 13. The vibration isolator inspection holes 113 are circular through holes penetrating in the thickness direction of the plate main body 11. The vibration isolator supports 114 are arranged at the bottom of the vibration isolator inspection holes 113 and are metal parts embedded in the precast floating slab 10 and are used as load-bearing components at the top of the vibration isolator 20.

[0049] A drain inspection hole 116 is further arranged in the middle of the precast floating slab 10. The drain inspection hole 116 is a circular or square through hole, penetrating in the thickness direction of the precast floating slab 10 and is located above the base drain 33. Optionally, the drain inspection hole 116 has a gradually changing aperture, and the aperture gradually becomes larger from the bottom surface to the top surface of the precast floating slab 10. A cover plate is installed at the top of the drain inspection hole 116.

[0050] In this embodiment, both the vibration isolator inspection holes 113 and the drain inspection holes 116 are formed by a demolding process.

[0051] Convex platform mating grooves 14 are respectively formed at both ends of the precast floating slab 10 in the length direction. The convex platform mating grooves 14 are rectangular parallelepiped grooves penetrating in the plate thickness direction, and the corners of the convex platform mating grooves 14 are rounded. The convex platform mating grooves 14 at the opposite ends of two adjacent precast floating slabs 10 can be combined to form a convex platform setting hole with a rounded rectangular cross section. The limiting convex platform 40 is a concrete block, and its cross-sectional shape matches that of the convex platform setting hole and is arranged in the convex platform setting hole. In addition, an elastic cushion plate (not shown in the figure) is further arranged between the outer peripheral surface of the limiting convex platform 40 and the side wall of the convex platform setting hole, so as to play a horizontal limiting role on two adjacent precast floating slabs 10. In this embodiment, one surface of the elastic cushion plate is distributed with a plurality of frustum pyramids, and the other surface is distributed with a plurality of frustum cones.

[0052] Figure 5 It is a schematic diagram of the demolding of the vibration isolator inspection hole in the embodiment of the present invention. Figure 5 The preparation mold 80 of the vibration isolator inspection hole and the vibration isolator inspection hole 113 formed by the preparation mold are shown. Figure 6 It is a flowchart of the preparation method of the precast floating slab in this embodiment.

[0053] As Figure 5 and Figure 6 shown, the preparation method of the precast floating slab includes the following steps:

[0054] Step SA1, according to the design requirements of the precast floating slab, respectively manufacture the preparation molds for the vibration isolator inspection holes and the drain inspection holes. Among them, the material and structure of the preparation mold should meet the requirements of molding and demolding.

[0055] Step SA2: According to the designed positions of the isolator inspection holes and the drain inspection holes in the design drawings, install and fix the preparation molds for the isolator inspection holes and the drain inspection holes respectively in the slab mold of the precast floating slab. Among them, the slab mold has parts for forming the above-mentioned strip-shaped grooves 112 and the boss mating grooves 14.

[0056] Step SA3: Uniformly apply a release agent on the outer surfaces of the preparation molds for the isolator inspection holes and the drain inspection holes respectively to reduce the adhesion between the slab and the preparation molds after pouring concrete to form the semi-finished slab, facilitating subsequent demolding.

[0057] Step SA4: Install the steel bar framework into the slab mold, and fix and adjust the steel bar framework to ensure that the positions and spacings of each steel bar meet the design requirements. And the thickness of the steel bar protective layer also needs to be strictly controlled around the preparation molds for the isolator inspection holes and the drain inspection holes.

[0058] Step SA5: Pour the concrete into the slab mold, and vibrate and compact the concrete to form a slab combined with the mold. Among them, when vibrating, it should be noted not to touch the preparation molds for the isolator inspection holes and the drain inspection holes to avoid affecting the accuracy of their positions.

[0059] Step SA6: After the concrete pouring is completed, when the strength of the concrete reaches the predetermined demolding requirement strength, perform the demolding operation. Specifically, first remove the slab mold, and then pull out the preparation molds for the isolator inspection holes and the drain inspection holes from the slab respectively according to the corresponding draft angles.

[0060] Step SA7: Carry out standardized curing on the demolded slab to ensure that it reaches the design strength, thereby obtaining the precast floating slab 10 with the isolator inspection holes 113 and the drain inspection holes 116.

[0061] A plurality of isolators 20 are respectively arranged between the precast floating slab 10 and the base 30, and are arranged in two rows, corresponding to the two upper rails 50 respectively, so that the precast floating slab 10 is "suspended" above the base 30. The precast floating slab 10 itself does not contact the base 30, but forms a point support form through a plurality of isolators 20, forming a certain gap between the lower surface of the precast floating slab 10 and the top surface 31 of the base. When a train passes over the precast floating slab 10, the train load causes the precast floating slab 10 to sink and displace, and the elastic components of the isolators 20 undergo a certain amount of compressive deformation, reducing the transmission of wheel-rail vibration during train operation to the base 30.

[0062] Figure 7 It is a schematic structural diagram of the isolator in this embodiment, which shows a partial cross-sectional structure of the isolator;Figure 8 is Figure 7 An enlarged view of the part inside the middle frame A.

[0063] As Figure 7 and Figure 8 shown, the vibration isolator 20 includes an elastic component 22, an initial height-adjusting gasket 23, and a horizontal limiting member 24. Optionally, the vibration isolator 20 may further include one or more split height-adjusting gaskets 25 and a plurality of gasket fixing members 26.

[0064] The vibration isolator support member 114 includes a load-bearing plate 1141 and a plurality of coupling members 1142. The load-bearing plate 1141 is disposed at the bottom of the prefabricated floating slab 10. The bottom surface of the load-bearing plate 1141 is located outside and below the floating slab 10, and is used to abut against the top of the elastic component 22, so as to serve as a load-bearing member at the top of the elastic component 22 and realize the transmission of force. The coupling members 1142 are embedded inside the prefabricated floating slab 10 and are used to be combined with the prefabricated floating slab 10, so that the vibration isolator support member 114 and the prefabricated floating slab 10 are more reliably combined.

[0065] In this embodiment, the load-bearing plate 1141 is an annular plate-shaped member made of steel. The aperture of the middle through-hole thereof is substantially the same as the aperture of the vibration isolator inspection hole 113, and it is disposed around the lower end of the vibration isolator inspection hole 113. The coupling members 1142 are fixed reinforcing bars, which are columnar. One end thereof is welded and fixed on the upper surface of the load-bearing plate 1141. The length direction thereof is substantially perpendicular to the surface direction of the load-bearing plate 1141. A plurality of coupling members 1142 are annularly distributed in the floating slab 10 on the outer periphery of the vibration isolator inspection hole 113. In an alternative solution, the prefabricated floating slab 10 may not be provided with the vibration isolator inspection hole 113, and the coupling members 1142 may also adopt other shapes, such as bent columnar shapes.

[0066] The elastic component 22 is used to achieve the vibration isolation and damping effect. It includes an upper end plate 221, a lower end plate 222, a rubber spring 223, a spring end fixing member 224, and an auxiliary fixing member 225.

[0067] The outer shapes of the upper end plate 221 and the lower end plate 222 are generally circular plate-shaped, and are used to make the force transmitted by the vibration isolator support member 114 be applied to the rubber spring 223 more evenly. Among them, the edge of the upper end plate 221 has a plurality of upper plate spring fixing holes 2211, which are circular through-holes or through threaded holes, etc.; a plurality of upper plate gasket fixing holes 2212 are provided at a position near the middle of the upper end plate 221. The edge of the lower end plate 222 has a plurality of lower plate spring fixing holes 2221, which are circular through-holes or through threaded holes, etc.; a lower plate limiting hole 2222 is provided in the middle of the lower end plate 222, which is a circular through-hole.

[0068] In this embodiment, the upper end plate 221 and the lower end plate 222 have substantially the same shape and size, and the same standard parts can be used, making the production of the elastic component 22 more convenient. Among them, multiple upper plate spring fixing holes 2211 are formed into multiple groups, each group includes two adjacent upper plate spring fixing holes 2211, and the multiple groups of upper plate spring fixing holes 2211 are evenly distributed along the edge (a circumference) of the upper end plate 221. Multiple lower plate spring fixing holes 2221 on the lower end plate 222 are also formed into the same multiple groups.

[0069] The rubber spring 223 is integrally in a solid flat column shape, and it includes a spring upper end portion 2231, a spring main body portion 2232, and a spring lower end portion 2233 that are integrally formed and coaxially arranged. Among them, both the spring upper end portion 2231 and the spring lower end portion 2233 are in a circular plate shape, the upper and lower ends of the spring main body portion 2232 are respectively connected to the spring upper end portion 2231 and the spring lower end portion 2233, and the spring main body portion 2232 is in a cylindrical shape with a gradually changing diameter, with the largest diameter at both ends and the smallest diameter in the middle in the axial direction.

[0070] The spring end fixing member 224 and the auxiliary fixing member 225 are used to respectively fix the spring upper end portion 2231 and the spring lower end portion 2233 of the rubber spring 223 to the upper end plate 221 and the lower end plate 222, making the elastic component 22 more stable during use.

[0071] In this embodiment, the spring end fixing member 224 is a fastening bolt, and the auxiliary fixing member 225 is an elastic pressing ring. Among them, multiple fastening bolts are respectively installed in the respective upper plate spring fixing holes 2211 of the upper end plate 221, and the nut side of these fastening bolts presses against the lower edge of the spring upper end portion 2231. The elastic pressing ring is sleeved on the outer periphery of the multiple fastening bolts on the upper end plate 221, and the elastic pressing ring is pressed by the other side of the nut of the fastening bolt. Similarly, multiple fastening bolts are respectively installed in the respective lower plate spring fixing holes 2221 of the lower end plate 222, and the nut side of these fastening bolts presses against the upper edge of the spring lower end portion 2233. Another elastic pressing ring is sleeved on the outer periphery of the multiple fastening bolts on the lower end plate 222, and the elastic pressing ring is pressed by the other side of the nut of the fastening bolt.

[0072] In an alternative solution, the upper and lower ends of the rubber spring 223 can also be fixed to the upper end plate 221 and the lower end plate 222 in other ways, for example, other fasteners can be used, or bonding and other methods can be adopted.

[0073] The elastic component 22 can be pre-assembled into a whole and transported to the track construction site for installation, and its components do not need to be assembled on-site.

[0074] The initial height-adjusting gasket 23 is arranged between the elastic component 22 and the base 30 and is used to adjust the height of the elastic component 22 during track construction (i.e., when initially installing the vibration isolator 22 on the top surface 31 of the base), so that the top surface of the prefabricated floating slab 10 above the elastic component 22 has a predetermined elevation. The initial height-adjusting gasket 23 is in the shape of an annular sheet, and a gasket limiting hole 231 is provided in the middle thereof, which is a circular through-hole. In this embodiment, the initial height-adjusting gasket 23 has a variety of different specifications, each having a different thickness, and the initial height-adjusting gasket 23 with the most suitable thickness can be selected according to the required elevation. In the vibration isolator 20, the number of the initial height-adjusting gaskets 23 is one. In an alternative solution, the initial height-adjusting gasket 23 can also be multiple laminated sheets. In this embodiment, the thickness of the initial height-adjusting gasket 23 or the total thickness of the multiple laminated initial height-adjusting gaskets 23 is 2 mm to 5 mm.

[0075] The horizontal limiting member 24 is in the shape of a cylinder. Limiting member mounting holes 32 matching the horizontal limiting member 24 are respectively provided at each predetermined vibration isolator mounting position on the base 30. The lower end of the limiting member 24 is fitted into the limiting member mounting hole 32, and the upper end is fitted into the gasket limiting hole 231 of the initial height-adjusting gasket 23 and the lower plate limiting hole 2222 of the lower end plate 222, so as to play a role in horizontally limiting the elastic unit 22 and prevent it from having horizontal displacement or deflection relative to the base 30.

[0076] The split height-adjusting gasket 25 is used to adjust the elevation of the corresponding position of the prefabricated floating slab 10 during subsequent operation and maintenance after the track construction is completed. For example, in the case of a small settlement of the base 30, one or more split height-adjusting gaskets 25 can be added to the vibration isolator 20 structure to overcome the problems caused thereby. The structure of the split height-adjusting gasket 25 is similar to that of the initial height-adjusting gasket 23 and is also in the shape of an annular sheet. The difference is that its thickness is relatively thinner, and a plurality of gasket assembly holes are provided on the split height-adjusting gasket 25, and their distribution corresponds to the plurality of upper plate gasket fixing holes 2212 on the upper end plate 221.

[0077] In this embodiment, the split height-adjusting gaskets 25 have the same thickness, and one or multiple laminated split height-adjusting gaskets 25 are selected accordingly according to the height to be adjusted. In an alternative solution, similar to the initial height-adjusting gasket 24, split height-adjusting gaskets 25 with a variety of specifications and different thicknesses can also be provided, and the split height-adjusting gasket 25 with the most suitable thickness can be selected according to the height to be adjusted.

[0078] The spacer fixing member 26 is used to fix one or a stack of split height-adjustable spacers 25 on the upper end plate 221, so that the track vibration isolator 20 after installing the split height-adjustable spacers 25 can maintain stable performance. In this embodiment, the spacer fixing member 26 is a bolt, which respectively passes through the spacer assembly holes on the split height-adjustable spacer 25 and the corresponding upper plate spacer fixing holes 2212 on the upper end plate 221, thereby fixing the split height-adjustable spacer 25 and the upper end plate 221.

[0079] As Figure 2 and Figure 3 shown, when the precast floating slab 10 is arranged on the base 30, strip-shaped grooves 112 cause a long strip-shaped lateral opening 115 to be respectively formed between both sides of the slab main body portion 11 and the top surface 31 of the base. It can be understood that when the precast floating slab 10 is directly placed on the top surface 31 of the base before installing the vibration isolator 20, due to the existence of the strip-shaped grooves 112, a similar lateral opening will also be formed between the slab main body portion 11 and the top surface 31 of the base, and this lateral opening and the strip-shaped grooves 112 can be used to lift the precast floating slab 10.

[0080] Moreover, since there are mating surfaces 117 below both sides of the precast floating slab 10, it can cooperate with the arc-shaped tunnel wall 210 of the tunnel 200, and a relief channel 119 communicating with the strip-shaped grooves 112 is respectively formed between the arc-shaped tunnel walls 210 on both sides of the base 30 and the corresponding mating surfaces 117. The equipment for lifting the precast floating slab 10 can extend into the strip-shaped grooves 112 by using the relief channel 119 to perform the lifting.

[0081] In addition, plate end sealing strips 60 are also arranged between the two ends in the width direction of the precast floating slab 10 and the arc-shaped tunnel wall 210, which are used to seal the relief channel 119 and the strip-shaped grooves 112 after the track construction is completed, so as to prevent construction waste, sundries, etc. from entering this space and affecting the operation of the vibration isolator 20 or the vibration isolator 20 itself.

[0082] In this embodiment, the length of each precast floating slab 10 is 3570 mm, the width is 2700 mm, and the thickness in the middle of the slab is 340 mm. The width of the convex portion 12 under the track slab is 1604 mm, and the groove width of the strip-shaped groove 112 is 348 mm. Each precast track slab 10 is provided with twelve bearing platforms 13, that is, six in each row, and the distance between the center lines of two adjacent bearing platforms 13 in each row is 600 mm. The distance between the two bearing platforms 13 closest to the end and the outer end surface of the corresponding end is 285 mm.

[0083] Each prefabricated track plate 10 is provided with six vibration isolator inspection holes 113, that is, three in each row, which are arranged at intervals between two adjacent bearing platforms 13 and close to the outer edge of the bearing platform 13. The distance from the center of each vibration isolator inspection hole 113 to the plate center line 10A (center line in the width direction) of the prefabricated track plate 10 is 940mm. Accordingly, each prefabricated track plate 10 is equipped with six vibration isolators 20. Each prefabricated track plate 10 is provided with a drainage ditch inspection hole 116, the upper end diameter of the drainage ditch inspection hole 116 is 300mm, and the lower end diameter is 280mm.

[0084] The width of the boss matching groove 14 is 820 mm, the distance between the bottom surfaces of two opposite boss matching grooves 14 is 404 mm, and an elastic pad with a thickness of 8 mm is arranged between the boss setting hole and the limiting boss 40 formed by the combination thereof.

[0085] The construction method of the above-mentioned point-supported prefabricated floating slab track 100 will be specifically described below in conjunction with the track structure.

[0086] Figure 9 FIG. 2 is a flow chart of the construction method of the point-supported prefabricated floating slab track in this embodiment. Figure 9 As shown, the construction method includes the following steps.

[0087] Step S1, surveying and setting benchmarks in a predetermined construction section.

[0088] Step S2, constructing the base in a predetermined construction section according to the base mark.

[0089] Step S3, detecting and adjusting the inclination of a plurality of predetermined vibration isolator installation surfaces on the top surface of the base, and re-measuring the base elevation.

[0090] Step S4, respectively installing vibration isolators on the respective vibration isolator mounting surfaces, and synchronously re-measuring the elevations of the respective vibration isolator mounting surfaces.

[0091] Step S5, laying a plurality of prefabricated floating plates above a plurality of vibration isolators, and fine-tuning the installation positions of the prefabricated floating plates.

[0092] Step S6, installing rails and rail buckle accessories on top of the multiple prefabricated floating slabs.

[0093] Step S7, constructing a limiting boss between two adjacent prefabricated floating slabs.

[0094] The above steps will be described in detail below.

[0095] Step S1, benchmarking and setting in a predetermined construction section. In this embodiment, the predetermined construction section is the tunnel.

[0096] Among them, the survey and establishment of the benchmark includes the survey and establishment of the CPⅢ control points and the base control benchmark of the track foundation control network. The CPⅢ pile points are arranged in pairs on both sides of the tunnel wall, with a height of 1.5m~2m from the predetermined rail top surface, 50m~60m in the straight section, and 30m~40m in the curved section; the line center benchmark is arranged according to the line direction, with a spacing of 3m, and steel piles are implanted on both sides of the line centerline benchmark as the ditch position control piles of the base center ditch. For the curved section, the offset should be considered; the base elevation control benchmark is arranged in pairs according to the center position of the vibration isolator in the digital slab plan, and the offset is 1070mm, so as to identify the installation position of the vibration isolator and avoid conflict with the spring position. The steel bar is implanted in the bottom plate as the vibration isolator position control pile, and the height is intercepted according to the on-site situation. After the control pile is set, the top elevation of the steel bar is measured. According to the steel bar return amount calculated by the measurement results, the technicians will promptly use tape to make the base top elevation control mark on the steel bar pile.

[0097] Step S2, performing base construction in a predetermined construction section according to the base mark.

[0098] Among them, the base construction includes the steps of steel bar binding, ditch formwork installation, and concrete pouring. The construction method is the same as the traditional construction method and will not be repeated.

[0099] Step S3, detecting and adjusting the inclination of a plurality of predetermined vibration isolator installation surfaces on the top surface of the base, and re-measuring the base elevation.

[0100] In order to ensure that the flatness and inclination of each vibration isolator installation surface meet the predetermined requirements, it is necessary to detect and timely adjust the inclination of the vibration isolator installation surface during the initial setting stage of the concrete of the base. A device that facilitates this operation will be exemplarily shown below.

[0101] Figure 10 It is a three-dimensional schematic diagram of the inclination detection and adjustment device in this embodiment.

[0102] like Figure 10 As shown, the inclination detection and adjustment device 90 includes an inclination detection portion 91 , a positioning portion 92 and a base adjustment portion 93 .

[0103] The inclination detection unit 91 includes an angle sensor assembly (not shown in the figure), a digital display component 912, and a plurality of function buttons 913. The angle sensor assembly is fixed in the inclination detection and adjustment device 90, and includes an angle sensor for real-time detection of the current inclination angle of the inclination detection and adjustment device 90. The digital display component 912 includes a display screen for displaying the inclination angle detected in real time. For example, according to the measured inclination angle, the digital display component 912 displays "angle: 4°". The function button 913 is used for function setting and switching.

[0104] The positioning part 92 includes a laser alignment instrument assembly 921. The laser alignment instrument assembly 921 includes a laser alignment instrument, which is used to mark the position control piles of the vibration isolator so as to perform positioning, ensuring that the inclination detection and adjustment device 90 is located at the vibration isolator installation surface.

[0105] The base adjustment part 93 includes a housing shell 931, a pair of handheld handles 932, a plurality of connecting columns 933 and an adjustment base 934.

[0106] The housing shell 931 is used to accommodate and fix the inclination detection part 91 and the positioning part 92. In this embodiment, the housing shell 931 is in the shape of a cuboid, hollow inside, and has a plurality of mounting holes on the upper surface and the lower surface respectively. The angle sensor assembly is fixedly installed inside the housing shell 931, the digital display component 912 is fixedly installed in the housing shell 931, and the display screen of the digital display component 912 is embedded in the corresponding mounting hole on the upper surface of the housing shell 931. A plurality of function keys 913 are respectively embedded in the corresponding mounting holes on the upper surface of the housing shell 931. The laser alignment instrument assembly 921 is fixed on the lower surface of the housing shell 931.

[0107] The plurality of connecting columns 933 are used to connect the housing shell 931 and the adjustment base 934, and the distance between the housing shell 931 and the adjustment base 934 is set by the length of the connecting columns 933. This distance is also approximately the height of the housing shell 931 relative to the top surface 31 of the base during use, so that the display screen of the digital display component 912 and the function keys 913 are at a height that is more convenient for construction workers to observe and operate. At the same time, connecting through the connecting columns 933 can also prevent blocking of the laser alignment instrument at the bottom of the housing shell 931.

[0108] The adjustment base 934 is used to provide contact and support with the vibration isolator installation surface for the detection of the inclination angle, and can also be used to adjust the vibration isolator installation surface. The adjustment base 934 includes an adjustment chassis 9341, a rotating chassis 9342, a rotating bearing 9343 and a plurality of limiting components 9344.

[0109] Among them, the adjustment chassis 9341 is in the shape of a circular plate, its diameter corresponds to the bottom diameter of the vibration isolator 20, its bottom surface is approximately flat, and its bottom surface is used to simulate the force-bearing surface at the bottom of the vibration isolator 20. In this embodiment, the adjustment chassis 9341 is designed according to the large sample of the bottom of the vibration isolator 20, and its diameter is equal to or slightly larger (the difference < 5%) than the diameter of the force-bearing surface at the bottom of the vibration isolator 20. When the bottom surface of the adjustment chassis 9341 is approximately fitted with the vibration isolator installation surface, the current inclination angle of the device detected by the angle sensor is also the inclination angle of the vibration isolator installation surface.

[0110] The rotating chassis 9342 is also in the shape of a circular plate, and its diameter is smaller than that of the adjustment chassis 9341. In this embodiment, there are four connecting columns 933. One end of each connecting column 933 is fixedly connected to a corner of the bottom surface of the accommodating housing 931, and the other end is fixedly connected to the upper surface of the rotating chassis 9342. The rotating chassis 9342 and the adjustment chassis 9341 are coaxially arranged and are rotatably arranged on the adjustment chassis 9341 through a rotating shaft (not shown in the figure) and a rotating bearing 9343. The center line of the accommodating housing 931 also coincides with the central axes of the rotating chassis 9342 and the adjustment chassis 9341.

[0111] The edge portion of the rotating chassis 9342 has a plurality of limiting component mounting holes, and a limiting component 9344 is mounted in each limiting component mounting hole. In this embodiment, the rotating chassis 9342 has a total of four limiting component mounting holes, which are evenly distributed along the circumference of its edge portion. Accordingly, four limiting components 9344 are installed. The limiting component 9344 is a limiting ball.

[0112] The upper surface of the adjustment chassis 9341 has a plurality of round-bottomed grooves that match the limiting balls. The number and distribution of the round-bottomed grooves correspond to the number and distribution of the plurality of limiting balls. When the rotating chassis 9342 rotates until the plurality of limiting component mounting holes on it are respectively aligned with the plurality of round-bottomed grooves in the vertical direction, the steel balls of each limiting component 9344 are respectively pressed into each round-bottomed groove, thereby playing a role in limiting the rotation of the rotating chassis 9342. When the rotating chassis 9342 is rotated with a greater force, the steel balls will be driven to roll out of the round-bottomed grooves, and the rotating chassis 9342 will be rotated. Therefore, through the limiting component 9344, the construction personnel can conveniently rotate the rotating chassis 9342 by 90 degrees each time, and the angle sensor assembly and the laser marking instrument assembly fixed on the rotating chassis 9342 will also rotate by 90 degrees accordingly.

[0113] Figure 11 is a schematic diagram of the usage state of the inclination detection and adjustment device in this embodiment, Figure 12 is Figure 11 an enlarged view of the part within the circle B in

[0114] As Figure 11 and Figure 12 shown, through step S1, vibration isolator position control piles 34 are set on both sides of the base 30. After the construction personnel confirm that the concrete on the top surface 31 of the base is in the initial setting state, they can identify the vibration isolator installation surface 311 on the top surface 31 of the base according to the vibration isolator position control piles 34, and use the above-mentioned inclination detection and adjustment device 90 to detect and adjust the inclination of the vibration isolator installation surface 311.

[0115] Figure 13 is a flowchart of step S3 in this embodiment. As Figure 13As shown, step S3 specifically includes the following sub-steps.

[0116] Step S3 - 1 , according to the vibration isolator position control pile 34 , the inclination detection and adjustment device 90 is placed on the top surface 31 of the base, and the bottom surface of the adjustment chassis 9341 is substantially completely in contact with the top surface 31 of the base.

[0117] Step S3-2, laser marking the isolator position control pile 34 by using a laser marking instrument, and adjusting the position of the chassis 9341 on the top surface 31 of the base according to the deviation between the laser marking and the isolator position control pile 34, until the laser marking coincides with the isolator position control pile 34, at which time the chassis 9341 is adjusted to be located on the isolator mounting surface 311.

[0118] Step S3-3, detecting the inclination angle of the vibration isolator mounting surface 311 through the angle sensor, judging whether the inclination angle of the vibration isolator mounting surface 311 meets the predetermined inclination angle requirement according to the angle data displayed by the digital display component 912, and entering the end state when it is judged to be yes.

[0119] Step S3-4: when the judgment in step S3-3 is no, the adjustment range and the adjustment angle are confirmed according to the deviation between the measured tilt angle and the predetermined tilt angle.

[0120] Step S3-5, according to the adjustment range and the adjustment angle, use the adjustment chassis 9341 to press the vibration isolator mounting surface 311 accordingly, and adjust the pressing during the pressing process according to the real-time angle data displayed by the digital display component 912 until the real-time angle data displayed by the digital display component 912 matches the predetermined tilt angle, stop pressing, and complete the adjustment of the vibration isolator mounting surface 311.

[0121] In practical applications, the above steps are mainly used to detect and adjust the lateral tilt angle of the vibration isolator mounting surface 311. Optionally, after the above step S3-5, the longitudinal tilt angle of the vibration isolator mounting surface 311 can also be further detected and adjusted. After the construction personnel rotate the rotating chassis 9342 90 degrees, the angle sensor fixed on the rotating chassis 9342 also rotates 90 degrees. Then, the longitudinal tilt angle can be detected and adjusted by referring to the above steps S3-3 to S3-5.

[0122] Step S4, respectively installing vibration isolators on the respective vibration isolator mounting surfaces, and synchronously re-measuring the elevations of the respective vibration isolator mounting surfaces.

[0123] Among them, the horizontal limit piece 14 is first installed in the middle of the vibration isolator mounting surface; then the initial height adjustment gasket 23 is placed on the vibration isolator mounting surface, and the horizontal limit piece 14 passes through the middle through hole of the initial height adjustment gasket 23; then the elastic component 22 is placed on the initial height adjustment gasket 23, and the upper end of the horizontal limit piece 14 is embedded in the lower plate limit hole 2222 at the bottom of the elastic component 22.

[0124] Then, the elevation of the vibration isolator 20 is re-measured. For the vibration isolator 20 whose elevation does not meet the standard, the initial height adjustment gasket 23 of the corresponding thickness is replaced in time according to the deviation between the measured current elevation and the corresponding elevation, or a number of initial height adjustment gaskets 23 are added / reduced from the stacked multiple initial height adjustment gaskets 23, so that the elevation of the vibration isolator 20 meets the standard, thereby completing the installation of the vibration isolator 20.

[0125] Step S5, laying a plurality of prefabricated floating plates above a plurality of vibration isolators, and fine-tuning the installation positions of the prefabricated floating plates.

[0126] Before laying the prefabricated floating slab 10, it should be confirmed that there is no residual debris on the top surface 31 of the base at the laying position. Then, multiple lifting equipment are installed on both sides of the prefabricated floating slab 10, and the prefabricated floating slab 10 is lifted to the position to be laid on the top surface 31 of the base by the lifting equipment.

[0127] During the stage of laying the falling slab, the floating slab digital fine-tuning software is used in conjunction with the total station for precise positioning and adjustment. When the prefabricated floating slab 10 is relatively close to the installation height, one or more klyometer frames are placed on it. The klyometer frame contains multiple high-precision prisms and inclination sensors. The total station is set up near the center line of the line for positioning and station setting. The total station measures the coordinates of the multiple prisms on the klyometer frame, thereby obtaining the position data of the prefabricated floating slab 10 in the horizontal, vertical and height directions.

[0128] During use, the theoretical three-dimensional line type parameters of the line are imported into the fine-tuning software for floating slabs. The software outputs the slab layout plan for a predetermined construction section, including the quantity of precast floating slabs 10 and the predetermined position data of each precast floating slab 10. Then, according to the line conditions, multiple prisms on the quick-adjusting truss are numbered, and the operation of the total station is controlled through a data transmission radio. When the total station measures the corresponding mileage, it will accurately position according to the slab layout plan of the floating slab fine-tuning software and issue synchronous adjustment data. The precast floating slab 10 is finely adjusted during laying according to the deviation between the horizontally and longitudinally measured position data and the corresponding predetermined position data. A transverse strut is used to control the horizontal and longitudinal position deviations during the slab lowering process. After the horizontal and longitudinal data of the four control points on the surface of the precast floating slab 10 meet the design requirements, the slab is completely unloaded and lowered. After lowering, the height data of the precast floating slab 10 can also be measured. After the data is stable and error-free, the lifting appliances on the sides of the precast floating slab 10 are removed, and then subsequent operations are carried out.

[0129] Step S6: Install rails and rail fasteners above multiple precast floating slabs.

[0130] Among them, after the horizontal and longitudinal data of multiple precast floating slabs 10 meet the specification requirements, rails 50 and rail fasteners are installed thereon, and at the same time, end seals 60 are installed between the two sides of the precast floating slabs 10 and the tunnel wall 210 to prevent construction waste from entering the reserved space below the precast floating slabs 10.

[0131] Step S7: Construct the limit bosses between adjacent precast floating slabs.

[0132] Among them, before the construction of the limit boss 40, the construction waste in the boss setting hole is cleaned, and an elastic cushion plate is installed on the inner side wall of the boss setting hole. When installing the elastic cushion plate, pay attention to installing the side with the frustum closely against the inner side wall, and the side with the pyramid facing the inside of the boss setting hole. Then, the bottom of the boss setting hole with the elastic cushion plate installed is sealed by means of a sealing measure, such as using a polyurethane foam caulking agent for sealing. After that, the steel bars required for the limit boss are restored in the boss setting hole according to the design requirements, and the elastic cushion plate is reinforced. Finally, concrete is poured in the boss setting hole to form the limit boss 40, and the pouring height requirement is flush with the upper surface of the precast floating slab 10.

[0133] It can be seen that there is no step of jacking up the precast floating slab 10 to install and adjust the vibration isolator 20 in the steps of the above construction method. In the construction method, the installation height of each vibration isolator 20 is first detected and adjusted, and then the precast floating slab 10 is directly laid, which can ensure that each vibration isolator 20 is in a good stress working state after laying. It is a "direct laying" construction method.

[0134] In addition, as mentioned above, after the track construction is completed, in the subsequent operation and maintenance, when the base settlement or the like occurs and the vibration isolator 20 is not normally stressed, the strip grooves 112 on both sides of the prefabricated floating plate 10 can be used to lift the prefabricated floating plate 10. After lifting, the corresponding vibration isolator inspection holes 113 or the strip grooves 112 and the make way channels 119 can be used to install one or multiple layers of split height adjustment gaskets 25 above the elastic component 22 as needed, thereby conveniently adjusting the elevation of the vibration isolator 20 so that the vibration isolator 20 can bear the force normally and play its vibration reduction role.

[0135] According to the point-supported prefabricated floating plate track and the construction method thereof provided by the present embodiment, the construction method steps include benchmark surveying and setting, base construction, isolator installation surface detection and adjustment, isolator installation, prefabricated floating plate laying, rail and buckle fitting installation and limit boss construction, wherein, since the isolator adopts a structure in which the initial height adjustment gasket is set between the base and the elastic component, the outer sleeve of the isolator is no longer provided in the prefabricated floating plate, but a bearing plate is embedded at the bottom of the plate, and the elastic component is externally arranged. In addition, during the construction, the installation height of each isolator is first detected and adjusted, and then the prefabricated floating plate is laid. Therefore, it is possible to avoid multiple jacking of the prefabricated floating plate to install and adjust the isolator as in the traditional construction method, forming a "straight laying" construction method without jacking, which greatly simplifies the process of the point-supported prefabricated floating plate track and improves the construction efficiency.

[0136] In the embodiment, in the vibration isolator installation step before paving, after placing the initial height adjustment gasket and the elastic component, the elevation at the vibration isolator is re-measured synchronously, and the initial height adjustment gasket is timely adjusted or replaced according to the re-measurement result, so that the installation height of the vibration isolator is guaranteed in this step, and there is no need to lift the prefabricated floating plate to adjust the vibration isolator during the subsequent construction process. In addition, since the elastic component is pre-assembled into a whole, the initial height adjustment gasket and the elastic component can be directly stacked and placed on the vibration isolator installation surface without a complicated assembly structure, so the vibration isolator is very convenient and fast to install and adjust.

[0137] Furthermore, in the step of laying the floating plate, a total station is used in conjunction with a fast adjustment frame to monitor the lateral and longitudinal position deviations of the prefabricated floating plate in real time, so that the installation position of the prefabricated floating plate can be finely adjusted to accurately place it on multiple vibration isolators, and the pre-buried load-bearing plate in the plate abuts against the upper end of the vibration isolator, so that the vibration isolator can bear the load normally. In addition, since the elastic component of the vibration isolator is completely external, unlike traditional vibration isolators, most of which are placed in the outer sleeve of the vibration isolator and are blocked and cannot be observed, the force condition of the vibration isolator can also be easily observed in this step.

[0138] In the embodiment, the prefabricated floating plate includes an integrally formed plate body and a plate lower convex portion, so the counterweight of the prefabricated floating plate itself can be increased by designing the plate lower convex portion, and its natural frequency can be reduced, which is beneficial to improving the vibration reduction effect of the entire track system. In addition, when the prefabricated floating plate is subjected to force, the bending moment at both ends in the width direction is small, while the bending moment in the middle of the plate is the largest. Due to the formation of the plate lower convex portion, the thickness of the prefabricated floating plate at both ends in the width direction is smaller than the thickness in the middle of the plate, so it can be better applied to such a force condition, and the structural strength of the prefabricated floating plate can be greatly improved. In addition, since a pair of strip-shaped grooves are formed below the two sides of the plate body, when the prefabricated floating plate is set on the base, a pair of side opening grooves will be formed between the two. After the track construction is completed, the grooves can also be used to conveniently realize the lifting of the prefabricated floating plate, so as to facilitate the inspection and maintenance of the vibration isolator and the replacement of the elastic component.

[0139] Furthermore, the prefabricated track plate also has multiple vibration isolator inspection holes, and a metal vibration isolator support is pre-buried at the bottom of each vibration isolator inspection hole. Therefore, the vibration isolator support can be used to abut against the vibration isolator to achieve load-bearing, so that the track system as a whole can withstand greater stress, and when installing the vibration isolator and in subsequent operation and maintenance, the vibration isolator inspection holes can also be used to conveniently check the status of each vibration isolator.

[0140] Furthermore, the prefabricated track slab also has a drainage ditch inspection hole, which is convenient for checking the condition of the base drainage ditch during subsequent operation and maintenance. In addition, the vibration isolator inspection hole and the drainage ditch inspection hole are formed through the demoulding molding process, which can ensure easy maintenance and significantly reduce construction costs.

[0141] In the embodiment, the load-bearing plate used as the load-bearing component at the top of the vibration isolator is a part of the embedded support member, and the support member also includes a plurality of coupling parts welded and fixed to the load-bearing plate, so that it can be more firmly and reliably combined with the floating plate, and because the plurality of coupling parts are strip-shaped and annularly distributed in the floating plate body around the inspection hole of the vibration isolator, the detection hole of the vibration isolator will not be blocked.

[0142] Furthermore, in the vibration isolator, the elastic component includes a rubber spring and upper and lower end plates, and the upper and lower ends of the rubber spring are fixed to the upper and lower end plates by a plurality of fastening bolts and elastic clamping rings, respectively. Therefore, the rubber spring can be subjected to more uniform force, the elastic component as a whole is more stable and reliable, and the components will not experience relative position shifting due to the vibration energy generated by the passing train, thereby ensuring a long-term and stable vibration reduction effect.

[0143] Furthermore, the track vibration isolator may further include one or more split shim sheets and corresponding fixing members. Therefore, during subsequent operation, when settlement occurs at the base and the elevation of the floating slab needs to be adjusted again, one or a stack of split shim sheets can be fixed above the elastic component to achieve further fine adjustment of the elevation, without the need to disassemble the vibration isolator structure to replace the initial shim sheet, making subsequent maintenance more convenient.

[0144] The above embodiments are only used to illustrate the specific embodiments of the present invention, and the present invention is not limited to the description scope of the above embodiments. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

[0145] For example, in the above embodiment, the track construction in a circular tunnel is taken as an example for specific illustration. It can be understood that the above construction method can also be similarly used for the construction of point-supported floating slab tracks in other areas, such as on conventional ground or on elevated roads, etc.

Claims

1. A construction method for a point-supported precast floating slab track, characterized in that, It includes the following steps: Step S1, carrying out benchmark survey and setting in a predetermined construction section; Step S2, carrying out foundation base construction according to the benchmarks in the said predetermined construction section; Step S3, detecting and adjusting the inclination of multiple predetermined vibration isolator mounting surfaces on the top surface of the foundation base, and carrying out elevation detection of the foundation base; Step S4, respectively arranging vibration isolators on each of the said vibration isolator mounting surfaces; Step S5, laying multiple precast floating slabs on the multiple said vibration isolators, and precisely adjusting the laying positions of the precast floating slabs during the laying process; Step S6, installing rails on the multiple said precast floating slabs to form a point-supported precast floating slab track, wherein, in Step S3, an inclination detection and adjustment device is used to detect and adjust the inclination angle of the vibration isolator mounting surface in the initial setting state, the vibration isolator includes a horizontal limit member, one or more initial height adjustment gaskets and an elastic component, in Step S4, the horizontal limit member, the initial height adjustment gasket and the elastic component are successively arranged on the vibration isolator mounting surface, so that the initial height adjustment gasket is located between the elastic component and the foundation base, and the horizontal limit member is fitted in the limit hole of the initial height adjustment gasket, and the current elevation at the vibration isolator is detected. When the current elevation does not meet the standard, the initial height adjustment gasket is adjusted or replaced according to the deviation between the current elevation and the predetermined elevation, in Step S1, vibration isolator position control piles are respectively arranged on both sides of the predetermined foundation base position in the said predetermined construction section, for marking the position of the vibration isolator mounting surface on the top surface of the foundation base, the inclination detection and adjustment device includes: a laser alignment instrument, used for laser aligning the vibration isolator position control piles to position the vibration isolator mounting surface; an angle sensor, used for detecting the inclination angle of the vibration isolator mounting surface; a digital display component, used for displaying angle data corresponding to the inclination angle measured by the angle sensor; and an adjustment chassis, used for contacting the vibration isolator mounting surface and pressing it when adjustment is needed, and the positions of the laser alignment instrument and the angle sensor are fixed relative to the adjustment chassis.

2. The construction method of the point-supported precast floating slab track according to claim 1, characterized in that: Among them, in Step S5, a quick adjustment support frame is arranged on the precast floating slab, and the quick adjustment support frame has multiple prisms, the coordinates of the multiple prisms are measured by a total station, so as to obtain the transverse position data and longitudinal position data of the precast floating slab during the laying process, and the laying position of the precast floating slab is precisely adjusted according to the deviation between the transverse position data, the longitudinal position data and the corresponding predetermined positions.

3. The construction method of the point-supported precast floating slab track according to claim 2, characterized in that: Among them, in Step S5, the theoretical three-dimensional line type parameters of the line corresponding to the point-supported precast floating slab track are imported into the floating slab precise adjustment software, and the floating slab precise adjustment software outputs the sectional layout plan of the predetermined construction section, including the number of the precast floating slabs and the predetermined position data of each precast floating slab. During the laying process, according to the deviation between the measured lateral position data, the longitudinal position data and the corresponding predetermined position data, a lateral support rod is used to control the lateral and longitudinal positions of the precast floating slab during the slab-lowering process, so as to finely adjust the laying position of the precast floating slab.

4. The construction method of the point-supported precast floating slab track according to claim 1, characterized in that: Among them, Step S3 includes the following sub-steps: Step S3-1, according to the vibration isolator position control pile, place the inclination detection and adjustment device on the top surface of the base, and make the bottom surface of the adjustment chassis fit the top surface of the base; Step S3-2, use the laser line marker to make a laser line on the vibration isolator position control pile, and adjust the position of the adjustment chassis on the top surface of the base until the laser line coincides with the vibration isolator position control pile, so that the adjustment chassis is placed on the vibration isolator installation surface; Step S3-3, detect the inclination angle of the vibration isolator installation surface through the angle sensor, and judge whether the inclination angle of the vibration isolator installation surface meets the predetermined angle requirement according to the angle data displayed by the digital display component; Step S3-4, when the judgment in step S3-3 is negative, confirm the adjustment range and adjustment angle according to the deviation between the measured inclination angle and the predetermined angle requirement; Step S3-5, according to the adjustment range and the adjustment angle, use the adjustment chassis to press the vibration isolator installation surface accordingly.

5. The construction method of the point-supported precast floating slab track according to claim 1, characterized in that: Among them, The precast floating slab has a plurality of vibration isolator inspection holes and drain inspection holes. After the construction is completed, the plurality of vibration isolator inspection holes are respectively located above each vibration isolator, and the drain inspection hole is located above the central drain of the base. The precast floating slab is a concrete slab, and the vibration isolator inspection hole and the drain inspection hole are formed by a demolding and forming process.

6. The construction method of the point-supported precast floating slab track according to claim 5, Characterized in that: Wherein, The preparation method of the precast floating slab includes the following steps: Step SA1, respectively manufacture the preparation molds for the vibration isolator inspection holes and the preparation molds for the drain inspection holes according to the design requirements of the precast floating slab; Step SA2, according to the designed positions of the vibration isolator inspection holes and the drain inspection holes, respectively fix the preparation molds for the vibration isolator inspection holes and the preparation molds for the drain inspection holes in the slab mold of the precast floating slab; Step SA3, respectively set a release agent on the outer surface of the preparation mold for the vibration isolator inspection hole and the outer surface of the preparation mold for the drain inspection hole; Step SA4, install the steel bar cage into the slab mold; Step SA5, pour concrete into the slab mold to form a slab combined with the preparation mold for the vibration isolator inspection hole and the preparation mold for the drain inspection hole. Step SA6: When the strength of the concrete reaches the predetermined demolding requirement strength, first remove the slab mold, and then pull out the preparation molds of the vibration isolator inspection holes and the drainage ditch inspection holes from the slab respectively according to the corresponding predetermined draft angles. Step SA7: Cure the demolded slab to obtain the precast floating slab.

7. A point-supported precast floating slab track, characterized in that, Obtained by the construction method of the point-supported precast floating slab track according to any one of claims 1-6, which includes: Base; A plurality of vibration isolators respectively arranged on the base; and A plurality of precast floating slabs respectively arranged on the plurality of vibration isolators, wherein the vibration isolator includes one or more initial height-adjusting gaskets and an elastic component, The initial height-adjusting gasket is arranged between the base and the vibration isolator for adjusting the elevation at the vibration isolator.

8. The point-supported precast floating slab track according to claim 7, wherein: Among them, Both sides of the precast floating slab have strip-shaped grooves extending along its length direction, so that the slab thickness in the middle of the precast floating slab in the width direction is greater than that at both ends. A bearing plate is embedded at the top surface of the strip-shaped groove. The vibration isolator is arranged in the strip-shaped groove, and its top abuts against the bearing plate. Lower parts at both ends in the width direction of the precast floating slab form a mating surface inclined relative to the width direction.

9. The point-supported precast floating slab track according to claim 7, wherein: Among them, The vibration isolator further includes one or a plurality of stacked split height-adjusting gaskets fixed on the top of the elastic component for adjusting the elevation at the vibration isolator.

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