Longitudinal track structure and construction method thereof

Abstract

The present invention relates to the field of rail transit technology, and aims to solve the problem in the prior art that embedded track construction is labor-consuming and time-consuming, which seriously affects the construction progress. A longitudinal track structure and a construction method thereof are provided, wherein the longitudinal track structure comprises steel rails, longitudinal rail-bearing grooves, a connecting device, and a track frame. Two adjacent longitudinal rail-bearing grooves are connected by a connecting device, the steel rails and the longitudinal rail-bearing grooves are fixed by the connecting device, and the two steel rails are fixed by the track frame. The construction method comprises the following steps: 1: initially laying the longitudinal rail-bearing grooves; 2: installing the connecting device; 3: installing and fixing the steel rails; 4: installing the track frame; 5: hoisting and transporting the track; 6: initially laying the track; 7: constructing the roadbed steel bar formwork; 8: fine-tuning and fixing the track; 9: pouring roadbed concrete; and 10: dismantling the tooling for recycling. The present invention can improve construction efficiency, save on-site installation time, and shorten fine-tuning time.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation technology, and in particular to a longitudinal track structure and a construction method thereof. Background Art

[0002] A new type of continuously supported track (commonly known as embedded track) is gradually being implemented in various cities across China's urban rail transit system. This embedded track features a cast-in-place longitudinal rail trough in tunnels. The longitudinal troughs and a polymer material within the troughs secure the rails, eliminating the need for sleepers or fasteners. Construction begins with the installation of the longitudinal rail troughs and the construction of the reinforced concrete ballast bed. The material within the troughs is then poured to secure the rails.

[0003] Longitudinal rail troughs are typically installed on-site, with each trough initially positioned and secured with temporary supports. After initial trough installation, the centerline and elevation of each trough must be measured and adjusted. This measurement process utilizes a total station and prism, requiring numerous measurement points and a lengthy process. Only after these adjustments are completed can the reinforced concrete of the trackbed be constructed. This labor-intensive and time-consuming method significantly impacts construction progress. Summary of the Invention

[0004] The present invention aims to provide a longitudinal track structure and a construction method thereof, so as to solve the problem in the prior art that the construction of embedded tracks is labor-consuming and time-consuming, which seriously affects the construction progress.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] The present invention provides a longitudinal rail structure, comprising steel rails, longitudinal rail-supporting grooves, connecting devices, and a rail frame. Two adjacent longitudinal rail-supporting grooves are connected by the connecting device, the steel rails and the longitudinal rail-supporting grooves are fixed by the connecting device, and the two steel rails are fixed by the rail frame.

[0007] The steel rails and longitudinal rail grooves of the present invention are pre-assembled into rail rows at the track laying base through connecting devices and rail row frames, and are hoisted and transported to the site for installation, which saves the time of loose laying and assembly on site. At the same time, the position of the longitudinal rail grooves is determined by the steel rails, which saves a lot of time compared to the on-site measurement of the center line and elevation of each longitudinal rail groove, and improves construction efficiency.

[0008] As the preferred technical solution:

[0009] The connecting device includes a bottom plate, a connecting column, a top plate, and a buckling block. The bottom plate and the top plate are arranged opposite to each other and are connected by the connecting column. The bottom plate is used to be connected to the longitudinal rail groove, and the rail is connected to the top plate through the buckling block.

[0010] As the preferred technical solution:

[0011] The bottom plate is connected to the bottom of the longitudinal rail groove through bolts.

[0012] As the preferred technical solution:

[0013] The base plate is a rectangular plate, and through holes with a diameter of Φ16mm are drilled at the four corners of the base plate. Two M12 threaded holes are symmetrically drilled at the bottom of both ends of the longitudinal rail groove. The drilling position of the bottom of the longitudinal rail groove corresponds to the drilling position of the base plate, that is, the M12 threaded hole at the bottom of the longitudinal rail groove corresponds to the Φ16mm through hole on the base plate. The two holes, one large and one small, are convenient for adjustment due to the error in the drilling position of the longitudinal rail groove and the error in the drilling position of the base plate that causes the installation to fail.

[0014] As the preferred technical solution:

[0015] The bottom plate is located inside the longitudinal support rail groove, the connecting column partially extends out of the longitudinal support rail groove, and the top plate is located outside the longitudinal support rail groove.

[0016] As the preferred technical solution:

[0017] The upper surface of the bottom plate is marked with a center line, the bottom edge line of the rail is marked on the top plate, and the upper surface of the bottom of the longitudinal rail groove is marked with a center line. The center line of the upper surface of the bottom of the longitudinal rail groove corresponds to the center line of the upper surface of the bottom plate, which is used to control the relative position of the longitudinal rail groove and the connecting device, thereby ensuring that the longitudinal rail groove is in the designed position after the position of the rail is fine-tuned.

[0018] As the preferred technical solution:

[0019] A rail bottom slope pad is provided on the top surface of the top plate, and the bottom surface of the rail fits with the rail bottom slope pad.

[0020] As the preferred technical solution:

[0021] The upper surface of the rail bottom slope pad is an inclined surface, and the side of the rail bottom slope pad with a larger thickness is arranged toward the outer side of the rail.

[0022] As the preferred technical solution:

[0023] The buckling block is an L-shaped structure, and the two buckling blocks are arranged opposite to each other and separated on both sides of the rail. One end of the buckling block is fixed on the top plate, and the other end of the buckling block is buckled on the rail foot.

[0024] As the preferred technical solution:

[0025] The buckling block is connected to the top plate through bolts.

[0026] As the preferred technical solution:

[0027] The top plate is provided with a thread hole, and the buckling block is provided with a through hole. The through hole on the buckling block corresponds to the thread hole on the top plate. After the two are aligned, bolts are installed in the holes.

[0028] As the preferred technical solution:

[0029] An M12 thread hole is drilled on the top plate, and a Φ14mm through hole is drilled on the buckling block. The Φ14mm through hole on the buckling block corresponds to the position of the M12 thread hole on the top plate. The two holes, one large and one small, are convenient for adjustment due to manufacturing errors of the rails. The buckling block is connected to the top plate by M12 bolts.

[0030] As the preferred technical solution:

[0031] Bolt holes are respectively provided at both ends of the longitudinal support rail groove, and through holes are respectively provided at both ends of the base plate. The bolt holes on the two adjacent longitudinal support rail grooves are respectively aligned with the through holes opened at both ends of the base plate, and bolts are installed in the holes to connect the two adjacent longitudinal support rail grooves together.

[0032] As the preferred technical solution:

[0033] The longitudinal rail supporting groove is a U-shaped structure.

[0034] As the preferred technical solution:

[0035] A plurality of the longitudinal rail grooves are continuously arranged as a longitudinal rail groove unit, and a gap is reserved between two adjacent longitudinal rail groove units as a track bed seam.

[0036] As the preferred technical solution:

[0037] A 0.2m gap is reserved between two adjacent longitudinal rail bearing groove units as a track bed seam.

[0038] As the preferred technical solution:

[0039] A connecting device is respectively provided at both ends of the longitudinal support rail groove unit, and two adjacent longitudinal support rail grooves in the longitudinal support rail groove unit are connected via a connecting device.

[0040] As the preferred technical solution:

[0041] Every 6 longitudinal rail grooves are arranged continuously as a longitudinal rail groove unit, and each longitudinal rail groove unit is installed with 7 connecting devices, wherein one connecting device is installed at each end of the longitudinal rail groove unit, and the connecting devices here correspond to the two bolt holes at the bottom of the longitudinal rail groove and are fixed with M12 bolts; one connecting device is installed at the joint position of each longitudinal rail groove in the middle of the longitudinal rail groove unit, and the two holes at the ends of the two longitudinal rail grooves at the joint position correspond to the four holes on the bottom plate of the connecting device and are fixed with M12 bolts.

[0042] As the preferred technical solution:

[0043] After the rails, the longitudinal rail grooves and the connecting device are assembled, the distance between the bottom of the rails and the top surface of the longitudinal rail grooves is 0.1m, which not only meets the installation space requirements of the rail rack frame, but also meets the space requirements for loosening and tightening the bottom bolts of the longitudinal rail grooves to perform secondary adjustments to the position of the longitudinal rail grooves during construction.

[0044] As the preferred technical solution:

[0045] The rail rack is installed in the gap between the bottom of the rail and the top surface of the longitudinal rail groove, and is longitudinally installed between the two connecting devices corresponding to the two rails to fix the two rails to form a rail rack.

[0046] The present invention further provides a construction method of a longitudinal track structure, comprising the following steps:

[0047] Step 1: Initial laying of longitudinal rail grooves: Lay two sets of longitudinal rail grooves at a certain interval. Multiple longitudinal rail grooves laid continuously form a longitudinal rail groove unit, with a gap left between the two longitudinal rail groove units.

[0048] Step 2: Install the connecting device: Install the connecting device on each longitudinal support rail slot unit. Connect one connecting device to each end of each longitudinal support rail slot unit. Connect one connecting device to the joint between two adjacent longitudinal support rail slots in each longitudinal support rail slot unit. Align the center line of the longitudinal support rail slot with the center line of the bottom of the connecting device.

[0049] Step 3: Install and fix the rails: Install two rails on the top surface of the connecting devices of the left and right sets of longitudinal rail grooves respectively. The two ends of the rails extend out of the cross section of the longitudinal rail grooves. Align the rail feet with the marking lines on the top plate of the connecting device, and then fix the rails.

[0050] Step 4: Install the rail frame: Install the rail frame between the bottom of the rail and the top surface of the longitudinal rail groove. The rail frame is located longitudinally between the two connecting devices and the spacing is adjustable;

[0051] The vertical rods and support rods of the track frame will be installed when the track is first laid. After each track is assembled, follow steps 1 to 4 to assemble the remaining track panels.

[0052] Step 5: Track hoisting and transportation: hoist the track onto the flatbed truck in the tunnel, transport it to the construction site, and hoist the track for initial laying;

[0053] Step 6: Initial track laying: Install the vertical poles and support poles of the track frame, and initially adjust the center line and track surface elevation of the track;

[0054] Step 7: Track bed reinforcement formwork construction: The track bed reinforcement formwork is transported to the site, the track bed reinforcement is tied, and the formwork is installed;

[0055] Step 8: Fine-tune and fix the track: Use a total station and a track inspection trolley to fine-tune the track, use vertical rods to adjust the track surface elevation, and use support rods to adjust the track centerline;

[0056] After the adjustment is completed, fix the longitudinal rail groove at the bottom of the segment to prevent it from floating up when pouring concrete;

[0057] Step 9: pouring roadbed concrete;

[0058] Step 10: Remove the tooling for recycling.

[0059] To improve track construction efficiency, the longitudinal track structure of the present invention is different from traditional track structures. It has no transverse sleepers and fasteners. During construction, the present invention temporarily changes the design elevation of the rails to achieve the purpose of rapid construction. This method provides reference value for similar projects.

[0060] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0061] 1. The longitudinal track structure provided by the present invention improves construction efficiency: For embedded tracks constructed without the track-panel method, the longitudinal rail troughs are laid loose. After the longitudinal rail troughs are transported to the construction site, they are temporarily fixed and installed there. With this track-panel method, rails and longitudinal rail troughs can be assembled into a standard 25m track at the track-laying base in advance, then transported to the construction site by railcar for hoisting and laying, saving on-site installation time.

[0062] 2. Shorten the fine-tuning time: For embedded track longitudinal rail grooves that are not constructed using the track arrangement method, the center line and elevation of each longitudinal rail groove at both ends must be measured. The longitudinal rail groove is 2.05m long, so there are 28 measurement points for a single 50m line. In addition, the error of measuring the center line and elevation using a prism is relatively large due to human operation, and the operation time is long. After using this track arrangement method for construction, the installation spacing of the track arrangement frame is 4m, and there are only 13 measurement points for a single 50m line. In addition, a track inspection trolley is used for measurement, which greatly reduces the operation time and improves the measurement accuracy (actual construction time record for a single 50m line: the fine-tuning time is 5h when the track arrangement method is not used, and the fine-tuning time is 1h when the track arrangement method is used). BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a planar layout diagram of the longitudinal track structure provided by the present invention;

[0064] Figure 2 This is an AA cross-sectional view of the longitudinal track structure provided by the present invention before pouring concrete;

[0065] Figure 3 This is a BB cross-sectional view of the longitudinal track structure provided by the present invention before pouring concrete;

[0066] Figure 4 This is an AA cross-sectional view of the longitudinal track structure provided by the present invention after pouring concrete;

[0067] Figure 5 This is a BB cross-sectional view of the longitudinal track structure provided by the present invention after pouring concrete;

[0068] Figure 6 This is the cross-section diagram after construction is completed;

[0069] Figure 7 This is an assembly diagram of the longitudinal track structure steel rails and longitudinal rail bearing grooves provided by the present invention;

[0070] Figure 8 This is a three-dimensional schematic diagram of the assembly of the longitudinal track structure steel rails and the longitudinal rail bearing grooves provided by the present invention;

[0071] Figure 9 This is a cross-sectional view of a connecting device used in the longitudinal rail structure provided by the present invention;

[0072] Figure 10 It is a side view of the connecting device used in the longitudinal rail structure provided by the present invention;

[0073] Figure 11 This is a plan view of the rail frame used in the longitudinal rail structure provided by the present invention;

[0074] Figure 12 It is a cross-sectional view of a rail frame used in the longitudinal rail structure provided by the present invention.

[0075] Icon: 1-rail, 2-longitudinal rail groove, 3-connecting device, 4-rail frame, 5-base plate, 6-connecting column, 7-top plate, 8-clamping block, 9-rail bottom slope pad, 10-bolt. DETAILED DESCRIPTION

[0076] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0077] Example 1

[0078] like Figures 1-12 As shown, this embodiment proposes a longitudinal rail structure, including a steel rail 1, a longitudinal rail groove 2, a connecting device 3, and a rail frame 4. The steel rail 1 and the longitudinal rail groove 2 are fixed by the connecting device 3, and the two steel rails 1 are fixed by the rail frame 4.

[0079] The connecting device 3 includes a bottom plate 5, a connecting column 6, a top plate 7, a clamping block 8, a rail bottom slope pad 9, and a bolt 10. The bottom plate 5 and the top plate 7 are arranged opposite each other and connected by the connecting column 6. The bottom plate 5 is used to connect to the bottom of the longitudinal rail bearing groove 2. The rail 1 is connected to the top plate 7 via the clamping block 8. The rail bottom slope pad 9 is set on the top surface of the top plate 7, and the bottom surface of the rail 1 is in contact with the rail bottom slope pad 9. The center line is marked on the upper surface of the bottom plate 5, and the bottom edge of the rail is marked on the top plate 7 to facilitate the installation of the rail 1 on the top plate 7.

[0080] In this embodiment, the clamping block 8 is an L-shaped structure, with two clamping blocks 8 disposed opposite each other, one on each side of the rail 1. One end of the clamping block 8 is fixed to the top plate 7 by a bolt 10, and the other end of the clamping block 8 is clamped to the lower flange plate of the rail 1. Specifically, an M12 threaded hole is drilled on the top plate 7, and a Φ14mm through hole is drilled on the clamping block 8 (the Φ14mm through hole in the clamping block 8 corresponds to the position of the M12 threaded hole on the top plate 7, and the two holes, one large and one small, are convenient for adjustment due to rail manufacturing errors). The clamping block 8 is connected to the top plate 7 by an M12 bolt.

[0081] In this embodiment, the bottom plate 5 is a rectangular plate, and through holes with a diameter of Φ16 mm are drilled at the four corners of the bottom plate 5 . The bottom plate 5 is connected to the longitudinal support rail groove 2 by bolts 10 .

[0082] In this embodiment, the longitudinal rail support groove 2 is a U-shaped structure, each 2.05m long. Two M12 tapped holes are symmetrically drilled at the bottom of each longitudinal rail support groove 2 at both ends. The drilled holes in the bottom of the longitudinal rail support groove 2 correspond to the drilled holes in the base plate 5, and the two are connected by installing bolts 10 in the holes. The base plate 5 has a Φ16mm through hole. The two holes, one large and one small, in the base plate 5 and the longitudinal rail support groove 2 facilitate adjustment for installation errors caused by errors in the drilled holes in the longitudinal rail support groove 2 and the base plate 5. The centerline is marked on the upper surface of the bottom of the longitudinal rail support groove 2.

[0083] In this embodiment, the longitudinal rail structure comprises six longitudinal rail grooves 2 arranged in a row as a longitudinal rail groove unit, with a 0.2m gap reserved between the longitudinal rail groove units as a track bed seam. Seven connecting devices 3 are installed in each longitudinal rail groove unit, wherein one connecting device 3 is installed at each end of the longitudinal rail groove unit. Here, the connecting devices 3 correspond to the two bolt holes at the bottom of the longitudinal rail groove and are fixed with M12 bolts; one connecting device 3 is installed at the joint position of each longitudinal rail groove 2 in the middle of the longitudinal rail groove unit. The two holes at the ends of the two longitudinal rail grooves 2 at the joint position correspond to the four holes on the bottom plate 5 of the connecting device 3 and are fixed with M12 bolts.

[0084] The top surface of the rail bottom slope pad 9 is an inclined surface, with one side higher and the other lower. The thicker side of the rail bottom slope pad 9 is placed toward the outside of the track. After the rail 1 and the longitudinal rail supporting groove 2 are fixed by the connecting device 3, the two rails 1 are connected and fixed to form a rail rack using a rail rack frame 4. The rail rack is installed in the gap between the bottom of the rail 1 and the top surface of the longitudinal rail supporting groove 2, and is installed in the longitudinal position between the two connecting devices 3.

[0085] After the steel rail 1, the longitudinal rail groove 2 and the connecting device 3 are assembled, the distance between the bottom of the steel rail 1 and the top surface of the longitudinal rail groove 2 is 0.1m, which not only meets the installation space requirement of the track frame 4, but also meets the space requirement for loosening or tightening the bottom bolts of the longitudinal rail groove 2 to perform secondary adjustment of the position of the longitudinal rail groove 2 during construction.

[0086] The construction method of the longitudinal track structure comprises the following steps:

[0087] Step 1: Initial laying of longitudinal rail groove 2

[0088] The longitudinal rail grooves 2 are initially laid at the track laying base, and two groups of longitudinal rail grooves 2 are laid with a horizontal interval of 1513mm (after the longitudinal track row 4 is assembled, the track gauge is 1435mm). Six longitudinal rail grooves 2 are laid continuously to form a longitudinal rail groove unit, and the interval between two longitudinal rail groove units is 0.2m.

[0089] Step 2: Install the connection device 3

[0090] Each longitudinal rail trough unit includes six longitudinal rail troughs 2. A connecting device 3 is installed at each end of the longitudinal rail trough unit, and one connecting device 3 is installed at each joint of the longitudinal rail troughs 2 in the middle of the longitudinal rail trough unit, for a total of five connecting devices 3 installed at the joints. The two threaded holes at the bottom of the longitudinal rail troughs 2 at the ends of the longitudinal rail trough unit correspond to the two outer holes of the connecting device 3 and are secured with M12 bolts. At the joint of the longitudinal rail troughs 2 in the middle of the longitudinal rail trough unit, the two threaded holes on each of the two longitudinal rail troughs 2 correspond to the four holes in the connecting device 3 and are secured with M12 bolts. The centerline of the longitudinal rail trough 2 is aligned with the centerline of the bottom plate 5 of the connecting device 3. The thicker side of the rail bottom slope pad 9 of the connecting device 3 faces outward, and the rail bottom slope pad 9 is designed to fit tightly against the bottom of the rail 1.

[0091] Step 3: Install the fixed rail 1

[0092] Two steel rails 1 are respectively installed on the top surface of the connecting device 3 of the left and right groups of longitudinal rail grooves 2, and the two ends of the steel rails 1 extend out of the cross-section of the longitudinal rail groove 2 by 0.1m (0.1m extending out from the end of the longitudinal rail groove 2 + 6 pieces of longitudinal rail grooves, a total of 12.3m + 0.2m of the roadbed seam + 6 pieces of longitudinal rail grooves, a total of 12.3m + 0.1m extending out from the end of the longitudinal rail groove = rail length 25m), and the rail feet of the steel rails 1 are respectively aligned with the marking lines of the top plate 7 of the connecting device 3, and then the clamping blocks 8 and M12 bolts are installed to fix the steel rails 1.

[0093] Step 4: Install the rail rack 4

[0094] Install the rail frame 4 between the bottom of the rail 1 and the top of the longitudinal rail groove 2. Use the gauge adjustment rod to adjust the gauge of the two rails 1 to 1435mm. The rail frame 4 is positioned longitudinally between the two connecting devices 3, with an adjustable spacing of approximately 4 meters. The vertical rods and support rods of the rail frame 4 are installed during the initial track laying. After each track is assembled, reassemble the remaining tracks according to steps 1-4.

[0095] Step 5: Rail hoisting and transportation

[0096] Use a base gantry crane or crane to lift the rails onto a flatbed truck in the tunnel and transport them to the construction site. Use a subway gantry to lift the rails for initial laying.

[0097] Step 6: Initial track laying

[0098] Install the vertical bars and struts of the track frame 4 to initially adjust the track centerline and track surface elevation. Add a connecting device 3 between the rail 1 and the longitudinal rail trough 2, raising the rail surface 226mm above the design. For straight sections without superelevation, simply raise the track surface 226mm when adjusting the track. For curved sections with superelevation, calculate the track centerline offset in advance based on the superelevation. Shift the track centerline inward by this calculated amount. Once the rail 1 is fine-tuned into position, the longitudinal rail trough 2 will be in the design position.

[0099] Step 7: Construction of trackbed reinforcement formwork

[0100] The track bed reinforcement formwork is transported to the site, the track bed reinforcement is tied, and the formwork is installed.

[0101] Step 8: Fine-tune and fix the rails

[0102] The track is fine-tuned using a total station and a track inspection trolley. During fine-tuning, the track surface elevation is raised 226mm above the design surface. In curved sections, the track centerline is offset inward according to the calculated amount. Vertical rods adjust the track surface elevation, and support rods adjust the track centerline.

[0103] After the adjustment is completed, drill holes at the bottom of the segment and insert expansion bolts, and install cables to fix the longitudinal rail groove 2 to prevent the longitudinal rail groove 2 from floating up when pouring concrete.

[0104] Step 9: Roadbed Concrete Pouring

[0105] The roadbed concrete is transported and poured using the subway's small gantry and hopper.

[0106] Step 10: Dismantle the tooling for recycling

[0107] After the concrete reaches a certain strength, the track frame 4 is removed, along with the clamping blocks 8 on both sides of the rail foot. The rail 1 is then hoisted onto the trackbed surface. The connecting device 3 is then removed, and a pad is installed at the bottom of the longitudinal rail trough 2. The rail 1 is then hoisted and placed into the longitudinal rail trough 2. Fixtures are then installed between the sides of the rail 1 and the side panels of the longitudinal rail trough 2 to secure the rail 1 as a transport channel. The track frame 4 and connecting device 3 are then recycled. Steps 1 through 10 are then repeated for subsequent trackbed pouring.

[0108] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A construction method for a longitudinal track structure, characterized by: The longitudinal rail structure includes steel rails, longitudinal rail grooves, connecting devices, and a rail frame. Two adjacent longitudinal rail grooves are connected by the connecting device. The steel rails and the longitudinal rail grooves are fixed by the connecting device. The two steel rails are fixed by the rail frame. The connecting device includes a bottom plate, a connecting column, a top plate, and a buckling block. The bottom plate and the top plate are arranged opposite to each other and are connected by the connecting column. The bottom plate is used to be connected to the longitudinal rail bearing groove, and the rail is connected to the top plate by the buckling block. The upper surface of the bottom plate is marked with a center line, the bottom edge line of the rail is marked on the top plate, and the upper surface of the bottom of the longitudinal rail supporting groove is marked with a center line. The center line of the upper surface of the bottom of the longitudinal rail supporting groove corresponds to the center line of the upper surface of the bottom plate, which is used to control the relative position of the longitudinal rail supporting groove and the connecting device, thereby ensuring that the longitudinal rail supporting groove is in the designed position after the position of the rail is fine-tuned into place; The clamping block is an L-shaped structure, and the two clamping blocks are arranged opposite to each other and are located on both sides of the rail. One end of the clamping block is fixed to the top plate, and the other end of the clamping block is clamped to the rail foot. The construction method comprises the following steps: Step 1: Initial laying of longitudinal rail grooves: Lay two sets of longitudinal rail grooves at a certain interval. Multiple longitudinal rail grooves laid continuously form a longitudinal rail groove unit, with a gap left between the two longitudinal rail groove units. Step 2: Install the connecting device: Install the connecting device on each longitudinal support rail slot unit. Connect one connecting device to each end of each longitudinal support rail slot unit. Connect one connecting device to the joint between two adjacent longitudinal support rail slots in each longitudinal support rail slot unit. Align the center line of the longitudinal support rail slot with the center line of the bottom of the connecting device. Step 3: Install and fix the rails: Install two rails on the top surface of the connecting devices of the left and right sets of longitudinal rail grooves respectively. The two ends of the rails extend out of the cross section of the longitudinal rail grooves. Align the rail feet with the marking lines on the top plate of the connecting device, and then fix the rails. Step 4: Install the rail frame: Install the rail frame between the bottom of the rail and the top surface of the longitudinal rail groove. The rail frame is located longitudinally between the two connecting devices and the spacing is adjustable; The vertical rods and support rods of the track frame will be installed when the track is first laid. After each track is assembled, follow steps 1 to 4 to assemble the remaining track panels. Step 5: Track hoisting and transportation: hoist the track onto the flatbed truck in the tunnel, transport it to the construction site, and hoist the track for initial laying; Step 6: Initial track laying: Install the vertical poles and support poles of the track frame, and initially adjust the center line and track surface elevation of the track; Step 7: Roadbed reinforcement formwork construction: The roadbed reinforcement formwork is transported to the site, the roadbed reinforcement is tied, and the formwork is installed; Step 8: Fine-tune and fix the track: Use a total station and a track inspection trolley to fine-tune the track, use vertical rods to adjust the track surface elevation, and use support rods to adjust the track centerline; After the adjustment is completed, fix the longitudinal rail groove at the bottom of the segment to prevent it from floating up when pouring concrete; Step 9: pouring roadbed concrete; Step 10: Remove the tooling for recycling: remove the track frame, remove the clamping blocks on both sides of the rail feet, hoist the rails onto the surface of the track bed, then remove the connecting device, install pads at the bottom of the longitudinal rail groove, hoist the rails into the longitudinal rail groove, install tooling between both sides of the rail waist and the side plates of the longitudinal rail groove to fix the rails as a transportation channel; the track frame and connecting device are recovered for recycling.

2. The construction method of the longitudinal track structure according to claim 1, characterized in that: A rail bottom slope pad is provided on the top surface of the top plate, and the bottom surface of the rail fits with the rail bottom slope pad.

3. The construction method of the longitudinal track structure according to claim 1, characterized in that: Bolt holes are respectively provided at both ends of the longitudinal support rail groove, and through holes are respectively provided at both ends of the base plate. The bolt holes on the two adjacent longitudinal support rail grooves are respectively aligned with the through holes opened at both ends of the base plate, and bolts are installed in the holes to connect the two adjacent longitudinal support rail grooves together.

4. The construction method of the longitudinal track structure according to claim 1, characterized in that: A plurality of the longitudinal rail grooves are continuously arranged as a longitudinal rail groove unit, and a gap is reserved between two adjacent longitudinal rail groove units as a track bed seam.

5. The construction method of the longitudinal track structure according to claim 4, characterized in that: A connecting device is respectively provided at both ends of the longitudinal support rail groove unit, and two adjacent longitudinal support rail grooves in the longitudinal support rail groove unit are connected via a connecting device.

6. The construction method of the longitudinal track structure according to claim 1, characterized in that: The rail rack is installed in the gap between the bottom of the rail and the top surface of the longitudinal rail groove, and is longitudinally installed between the two connecting devices corresponding to the two rails to fix the two rails to form a rail rack.

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