A construction method for prefabricated steel fiber concrete monolithic roadbed of urban rail transit

Abstract

The present invention discloses a method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit, including S101, construction preparation; S102, initial adjustment of the prefabricated track plate: initial adjustment of the prefabricated track plate by the threaded screw until the top surface of the prefabricated track plate is in a horizontal state; S103, installation of the ditch template; S104, reinforcement and compaction of the prefabricated track plate; S105, fine adjustment of the erection of the prefabricated track plate: adjusting the center position of the prefabricated track plate by the oblique supports on both sides until the center line of the prefabricated track plate coincides with the center line of the base, and adjusting the elevation position of the prefabricated track plate by the threaded screw until the design requirements are met; S106, pouring steel fiber concrete. The beneficial effects of the present invention are: realizing a monolithic roadbed cast in one time, improving the laying quality of the roadbed, performing alignment and installation procedures before pouring, greatly simplifying the construction procedures, improving the efficiency of track construction, and shortening the construction period.

Description

Technical Field

[0001] The invention relates to the technical field of urban rail transit track engineering, in particular to a construction method for a prefabricated plate type steel fiber concrete integral track bed for urban rail transit. Background Art

[0002] The ballast is an important part of the track and the foundation of the track frame. Its main function is to support the rails and evenly transfer the huge pressure of the vehicle on the rails to the foundation surface. At the same time, it can also alleviate the impact of the wheels of the locomotive and vehicle on the rails. Most of the prefabricated slab ballasts in existing urban rail transit projects are constructed by multiple pouring methods such as base, self-compacting concrete, and ditch. That is, the base needs to be poured first, and then the prefabricated slabs are laid, self-compacting concrete is poured, and ditch pouring is carried out. At the same time, due to multiple pouring, the benchmark for each pouring needs to be verified, the construction process is relatively cumbersome, the track construction efficiency is low, and the construction period is long. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for constructing a prefabricated steel fiber concrete integral roadbed for urban rail transit, which can realize one-time pouring to form an integral roadbed, improve the quality of roadbed laying, and at the same time simplify the construction process and improve the efficiency of track construction.

[0004] The object of the present invention is achieved through the following technical scheme: A method for constructing a prefabricated plate steel fiber concrete monolithic roadbed for urban rail transit, which comprises the following steps:

[0005] S101, construction preparation: cleaning the base and measuring and marking the placement position of the prefabricated track slab, painting the prefabricated track slab with a waterproof isolation layer, and then transporting the painted prefabricated track slab to the laying position;

[0006] Preferably, the prefabricated track slab adopts a unit block structure and is a non-prestressed concrete structure without shoulder reinforcement. Its concrete strength grade is C50. Its specifications mainly include 4700mm and 3500mm lengths, 2200mm widths, and 330mm thicknesses. Among them, 4700mm slabs are used in straight sections and sections with a curve radius of more than 500m, and 3500mm slabs are used in sections with a curve radius of ≤500m. A 100mm plate seam is set between the prefabricated slabs. The bottom of the prefabricated track slab adopts a steel fiber fine stone concrete structure with a concrete grade of C40.

[0007] S102, initial adjustment of prefabricated track slabs: after the prefabricated track slabs reach the laying position, track lifting frames are installed on the four corners of the prefabricated track slabs. After the installation is completed, the threaded screw of the track lifting frame contacts the base (the threaded screw supports the prefabricated track slabs). Preferably, the threaded screw is arranged perpendicular to the base, and the prefabricated track slabs are initially adjusted by the threaded screw until the top surface of the prefabricated track slabs is in a horizontal state; preferably, a small door crane is used to lift the prefabricated track slabs to complete the initial adjustment in this process, and the adjustment steps of the four corners of the prefabricated track slabs should be kept consistent to avoid damage to the corners of the track slab lifting holes caused by excessive force at a single point.

[0008] S103, installation of the gutter template: after the initial adjustment of the prefabricated track plate is completed, the gutter templates are installed on both sides of the prefabricated track plate, at least one connecting bracket for connecting the gutter template and the prefabricated track plate is provided between the gutter template and the prefabricated track plate, the gutter template is provided with a beam connected to the gutter template as a whole, the connecting bracket is provided with a slot for limiting the beam, after installation, the beam on the gutter template is clamped in the slot, it should be noted that the slot can be either an embedded slot or an external convex slot, and the two ends of the connecting bracket are respectively connected to the gutter template and the prefabricated track plate;

[0009] S104, prefabricated track slab reinforcement and compaction: after the ditch formwork is installed, an inclined support is installed, one end of the inclined support is connected to the prefabricated track slab, and the other end of the inclined support is connected to the track support piers on both sides of the prefabricated track slab, and then an anti-floating device is installed on both sides of the prefabricated track slab, and the anti-floating device can effectively prevent the prefabricated track slab from floating when pouring concrete;

[0010] S105, fine adjustment of the erection of the prefabricated track plate: after the prefabricated track plate is reinforced and compacted, the center position of the prefabricated track plate is adjusted by the oblique supports on both sides until the center line of the prefabricated track plate coincides with the center line of the base, and then the height of the prefabricated track plate is detected, and the elevation position of the prefabricated track plate is adjusted by the threaded screw until the design requirements are met;

[0011] S106. Casting steel fiber concrete: Isolation plates are installed at both ends of the precast track slab. It should be noted that in the present application, one or several precast track slabs can be formed into an integral casting area, and partitions can be set at the head and tail of the casting area. The precast track slab is provided with casting holes, and the steel fiber concrete is cast through a casting device installed on the casting holes. When the casting reaches the required design height (the plane of the integral roadbed formed by casting is flush with the top surface of the ditch template), the casting device is closed and the steel fiber concrete is vibrated and compacted by a vibrating rod to form an integral roadbed. When the steel fiber concrete to be filled is initially set, a limiting steel bar is inserted into the casting hole and concrete is poured again until the plate surface is flush with the plate surface to form a limiting pile. After the casting is completed, the casting device can be removed.

[0012] The track lifting frame includes a fixed plate and a threaded screw. The fixed plate is provided with an elevation adjustment nut matching the threaded screw. The fixed plate is installed on the prefabricated track plate by fixing bolts. The height of the prefabricated track plate is adjusted by rotating the threaded screw.

[0013] The waterproof isolation layer is sprayed on the bottom, both sides and ends of the prefabricated track slab with a 2-3mm thick tetrahydroxy complex resin isolation layer. The bonding strength of the isolation layer is above 1.0Mpa. After curing, the isolation layer has certain elasticity and good water resistance.

[0014] The connecting bracket is composed of a bracket upper beam, a bracket lower beam, and a connecting plate connecting the bracket upper beam and the bracket lower beam. The prefabricated track plate is provided with a plurality of sleepers arranged in parallel. After installation, the bracket upper beam is fixed to the sleeper by a second fastening assembly, and the bracket lower beam is fixed to the ditch template by a third fastening assembly. The ditch template is prevented from floating up by tightening the third fastening assembly.

[0015] End surface fixing plates are arranged at both ends of the ditch template, and the end surface fixing plates of adjacent ditch templates are fixed by a first fastening assembly.

[0016] Both ends of the beam are connected to the ditch template to form a door beam structure, and the center line of the beam is arranged parallel to the center line of the prefabricated track plate.

[0017] In the installation of the ditch template in step S103, a connecting bracket is installed every other sleeper.

[0018] The anti-floating device consists of an anti-floating fixed bracket and a threaded hook. The anti-floating fixed bracket is installed on the prefabricated track plate. An adjusting nut matching the threaded hook is provided on the anti-floating fixed bracket. The bottom hook of the threaded hook is connected to the anchor hook on the base.

[0019] The oblique support is composed of an adjusting sleeve, a first supporting rod and a second supporting rod, one end of the first supporting rod and one end of the second supporting rod are simultaneously mounted on the adjusting sleeve, the other end of the first supporting rod is connected to the prefabricated track plate, and the other end of the second supporting rod is connected to the running rail pier, the threads on the first supporting rod and the second supporting rod are arranged in opposite directions, and the first supporting rod and the second supporting rod are synchronously approached or moved away by rotating the adjusting sleeve.

[0020] The pouring device comprises a pouring funnel installed on the pouring hole, and a funnel valve is arranged at the bottom of the pouring funnel.

[0021] Preferably, the second fastening assembly adopts a T-bolt. Both ends of the beam are connected to the gutter template to form a gate beam structure, and the center line of the beam is arranged parallel to the center line of the prefabricated board. The connecting brackets on both sides of the prefabricated track plate for connecting the prefabricated board and the gutter template are arranged symmetrically. There is a gap between the lower beam of the bracket and the gutter template and they are fixed by the third fastening assembly, and the third fastening assembly is fastened by a screw. The connection between the upper beam of the bracket and the connecting plate, and the connection between the lower beam of the bracket and the connecting plate are arranged at right angles. The upper beam of the bracket is arranged perpendicular to the center line of the prefabricated board. The lower beam of the bracket is arranged perpendicular to the center line of the gutter template.

[0022] The integrally cast ballast bed is constructed by reverse laying. The principle is to process the prefabricated track slabs in the factory and transport them to the site for assembly. The integral ballast bed is cast first and then the rails are connected. For prefabricated track slabs, the existing ditch templates are not applicable, so the present application changes the connection method of the template, and adopts a connecting bracket to be fixed on the bolt hole of the sleeper, and the other side is connected to the ditch template to achieve the installation of the ditch template. The present application is applicable to the integral ballast bed structure of the prefabricated slab cast in one time, so that the installation of the ditch template can be achieved quickly and meet the template elevation target. The template bracket is fixed to the sleeper of the prefabricated track slab by T-bolts. Preferably, a connecting bracket is installed at every sleeper interval, and the ditch template is connected to the connecting bracket by bolts, so that the ditch template and the prefabricated slab form a whole. During the height adjustment process of the track row, the ditch template is adjusted together with the prefabricated slab, so that the design elevation of the ditch template can be controlled.

[0023] In the present application, one end of the connecting bracket is fixed to the rail sleeper by a T-bolt, and the other end of the connecting bracket is fixed to the ditch template by a screw rod, so as to control the height of the ditch template and prevent the ditch template from floating and shaking. At the same time, the beam of the ditch template is placed in the slot of the connecting bracket, which effectively controls the outward deviation of the ditch template and improves the stability of the ditch template when adjusting the height; the ditch template makes full use of the rail sleeper bolt holes and T-bolts (i.e., spikes) to fix the template bracket, saving the fixing fasteners of the ditch template, thereby saving costs. The ditch template is firm and smooth, and the ditch is easy to disassemble and assemble, which meets the requirements of the prefabricated slab track bed ditch; at the same time, the ditch template installation tool has a simple structure, and the raw materials for manufacturing this tool are steel bars, steel pipes, etc., so that the raw materials are easy to obtain and the price is low, which reduces the manufacturing cost. The ditch template is connected to the prefabricated track plate as a whole, replacing the existing method of fixing the ditch template at the bottom, meeting the requirements of adjusting the ditch template together with the prefabricated track plate, and simplifying the height adjustment operation of the prefabricated slab on-site casting.

[0024] The beneficial effects of the present invention are as follows: (1) during the initial adjustment of the prefabricated track plate, the prefabricated track plate is initially adjusted by the threaded screw until the top surface of the prefabricated track plate is in a horizontal state, and the installation reference is determined for the installation of the ditch template and the reinforcement and compaction of the prefabricated track plate. During the fine adjustment of the erection of the prefabricated track plate, the center of the prefabricated track plate is firstly aligned by the inclined support, and then the height of the prefabricated track plate is adjusted on the basis of the center alignment. The alignment of the prefabricated track plate and the reinforcement and compaction components is completed in the early stage of casting, and then it can be cast and formed once, thus realizing an integral ballast bed formed by one casting, and improving the ballast bed laying quality; (2) the present application does not require multiple castings, and the alignment and installation process can be carried out before casting. After the casting is completed, the ditch template, the connecting bracket and the casting device need only be removed, which greatly simplifies the construction process, improves the track construction efficiency, and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of the present invention;

[0026] Figure 2 It is a plan view of the present invention before pouring (the pouring device is not shown);

[0027] Figure 3 It is a side schematic diagram of the present invention during pouring;

[0028] Figure 4 It is a structural schematic diagram of the connecting bracket of the present invention;

[0029] Figure 5 A top view of the connecting bracket of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the platform frame of the present invention;

[0031] Figure 7 It is a schematic diagram of the installation structure of the connecting bracket of the present invention;

[0032] Figure 8 A partial cross-sectional view of the mounting structure of the connecting bracket of the present invention;

[0033] Fig. 9 A top view of the anti-floating device of the present invention;

[0034] Fig.10 It is a schematic diagram of the side structure of the anti-floating device of the present invention.

[0035] In the figure, 1-prefabricated track plate, 2-track lifting frame, 3-ditch template, 4-connecting bracket, 5-inclined support, 6-anti-floating device, 7-track support pier, 8-casting device, 9-anchor hook, 101-sleeper, 102-casting hole, 103-track lifting auxiliary sleeve, 104-fixing sleeve, 201-threaded screw, 202-fixing plate, 203-elevation adjustment nut, 204-fixing bolt, 301-beam, 302 -end face fixing plate, 303-first fastening assembly, 401-upper beam of bracket, 402-lower beam of bracket, 403-connecting plate, 404-second fastening assembly, 405-third fastening assembly, 406-slot, 501-adjusting sleeve, 502-first support rod, 503-second support rod, 601-anti-floating fixing bracket, 602-threaded hook, 603-adjusting nut, 801-casting funnel, 802-funnel valve. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-Figure 3 As shown, a method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit comprises the following steps:

[0038] S101, construction preparation: cleaning the base and measuring and setting out the placement position of the prefabricated track slab 1, and applying a waterproof isolation layer to the prefabricated track slab 1, and then transporting the painted prefabricated track slab 1 to the laying position;

[0039] S102, initial adjustment of the prefabricated track slab: after the prefabricated track slab 1 reaches the laying position, a track raising frame 2 is installed on the four corners of the prefabricated track slab 1. After the installation is completed, the threaded screw 201 of the track raising frame 2 is in contact with the base, and the prefabricated track slab 1 is initially adjusted by the threaded screw 201 until the top surface of the prefabricated track slab 1 is in a horizontal state;

[0040] S103, installation of ditch templates: After the initial adjustment of the prefabricated track plate 1 is completed, ditch templates 3 are installed on both sides of the prefabricated track plate 1. Figure 4-Figure 5 As shown, at least one connecting bracket 4 for connecting the ditch template 3 and the prefabricated track plate 1 is provided between the ditch template 3 and the prefabricated track plate 1, a beam 301 connected to the ditch template 3 is provided on the ditch template 3, and a clamping groove 406 for limiting the beam 301 is provided on the connecting bracket 4. After installation, the beam 301 on the ditch template 3 is clamped in the clamping groove 406, and the two ends of the connecting bracket 4 are respectively connected to the ditch template 3 and the prefabricated track plate 1;

[0041] S104, prefabricated track slab reinforcement and compaction: after the ditch formwork 3 is installed, install the inclined support 5, one end of the inclined support 5 is connected to the prefabricated track slab 1, and the other end is connected to the running rail support piers 7 on both sides of the prefabricated track slab 1, and then install the anti-floating device 6 on both sides of the prefabricated track slab 1;

[0042] S105, fine adjustment of the erection of the prefabricated track plate: after the prefabricated track plate is reinforced and compacted, the center position of the prefabricated track plate is adjusted by the oblique supports 5 on both sides until the center line of the prefabricated track plate coincides with the center line of the base, and then the height of the prefabricated track plate is detected, and the elevation position of the prefabricated track plate is adjusted by the threaded screw 201 until the design requirements are met;

[0043] S106, pouring steel fiber concrete: Isolation plates are installed at both ends of the prefabricated track plate 1. The prefabricated track plate 1 is provided with a pouring hole 102. The top of the pouring hole 102 is R200mm round, the bottom is R190mm round, and an EPDM elastic buffer layer is provided in the grouting hole. The steel fiber concrete is poured through the pouring device 8 installed on the pouring hole 102. When the pouring reaches the design required height, the pouring device 8 is closed and the steel fiber concrete is vibrated and compacted by a vibrating rod to form an integral track bed. When the steel fiber concrete to be filled is initially set, a limiting steel bar is inserted into the pouring hole 102 and concrete is poured again until the plate surface is flush to form a limiting pile.

[0044] As a preferred method, the following requirements should be met during pouring: (1) The mixing equipment should be a forced mixer with a mixing speed of not less than 45 rpm. (2) The measurement error of each material constituting fine aggregate concrete: the measurement error of cement, fly ash, ground slag powder, water reducer and water should not exceed ±1%; the measurement error of sand and stone should not exceed ±2%. The weighing electronic sensor of the mixing system should be calibrated once every quarter. (3) Mechanical addition should be adopted for steel fiber addition. When manual addition is required under special circumstances, a special addition plan should be formulated and the supplier should provide necessary construction technical support to ensure uniform dispersion of steel fiber. (4) The mixing time of steel fiber fine aggregate concrete mixture should not be less than 120s and not more than 180s. (5) The slump and air content of fine aggregate concrete mixture should meet the concrete mixture performance and construction requirements. (6) The fine aggregate concrete mixture should be poured within 30 minutes after mixing. Fine aggregate concrete should be poured continuously with a maximum interval of not more than 6 minutes.

[0045] After pouring, remove the ditch formwork, connecting brackets and pouring devices, and proceed with the subsequent track erection. At the same time, the integral roadbed is shaped and maintained. After the steel fiber concrete is poured, geotextiles are used for covering and maintenance in time. The curing time with formwork shall not be less than 24 hours. After removing the formwork, moisturizing and heat preservation curing measures such as geotextile wrapping, curing film covering or spraying curing agent shall be adopted. Keep the concrete surface fully moist. Under normal circumstances, it is cured once every 1 to 2 hours during the day and once every 4 hours at night, and the natural curing shall not be less than 14 days.

[0046] like Figure 6 As shown, the track lifting frame 2 includes a fixed plate 202 and a threaded screw 201, the fixed plate 202 is provided with an elevation adjustment nut 203 matching the threaded screw 201, the fixed plate 202 is installed on the prefabricated track plate 1 through a fixing bolt 204, the prefabricated track plate 1 is provided with a track lifting auxiliary sleeve 103 matching the fixing bolt 204, the fixing bolt 204 is screwed into the track lifting auxiliary sleeve 103 to achieve the installation of the fixed plate 202, and the height of the prefabricated track plate 1 is adjusted by rotating the threaded screw 201.

[0047] The application of the waterproof isolation layer refers to spraying a 2-3mm thick tetrahydroxy complex resin isolation layer on the bottom, both sides and ends of the prefabricated track slab, and the bonding strength of the isolation layer is above 1.0Mpa.

[0048] like Figure 7-Figure 8As shown, the connecting bracket 4 is composed of a bracket upper beam 401, a bracket lower beam 402, and a connecting plate 403 connecting the bracket upper beam 401 and the bracket lower beam 402. The prefabricated track plate 1 is provided with a plurality of parallelly arranged sleepers 101. After installation, the bracket upper beam 401 is fixed to the sleeper 101 by a second fastening component 404. The sleeper 101 is provided with a fixing sleeve 104 matching the second fastening component 404. The second fastening component 404 is screwed into the fixing sleeve 104 to fix the bracket upper beam 401. The bracket lower beam 402 is fixed to the ditch template 3 by a third fastening component 405.

[0049] End surface fixing plates 302 are provided at both ends of the gutter template 3 , and the end surface fixing plates 302 of adjacent gutter templates 3 are fixed by a first fastening assembly 303 .

[0050] Both ends of the beam 301 are connected to the gutter template 3 to form a gate beam structure, and the center line of the beam 301 is arranged parallel to the center line of the prefabricated track plate 1 .

[0051] In the installation of the ditch template in step S103, a connecting bracket 4 is installed every other sleeper 101.

[0052] like Figure 9-10 As shown, the anti-floating device 6 consists of an anti-floating fixed bracket 601 and a threaded hook 602. The anti-floating fixed bracket 601 is installed on the prefabricated track plate 1 through a bolt assembly. The anti-floating fixed bracket 601 is provided with an adjusting nut 603 matching the threaded hook 602. The bottom hook of the threaded hook 602 is connected to the anchor hook 9 on the base.

[0053] The oblique support 5 is composed of an adjusting sleeve 501, a first supporting rod 502 and a second supporting rod 503. One end of the first supporting rod 502 and one end of the second supporting rod 503 are simultaneously mounted on the adjusting sleeve 501. The other end of the first supporting rod 502 is connected to the prefabricated track plate 1. The other end of the second supporting rod 503 is connected to the running rail pier 7. The threads on the first supporting rod 502 and the second supporting rod 503 are arranged in opposite directions. The first supporting rod 502 and the second supporting rod 503 can be synchronously approached or moved away from each other by rotating the adjusting sleeve 501.

[0054] The pouring device 8 comprises a pouring funnel 801 installed on the pouring hole 102 , and a funnel valve 802 is provided at the bottom of the pouring funnel 801 .

[0055] An expansion joint with a width of 20mm is set every 14-15m along the line. The expansion joint is generally set in the middle of the track slab joint. The expansion joint is filled with asphalt board and capped with 30mm PTN.

[0056] Preferably, the connecting bracket 4 is composed of an iron plate with a length of 1m, which is bent at an angle of 90 degrees at a distance of 0.3m from the connecting template section. It can be seen that the upper beam 401 of the bracket, the lower beam 402 of the bracket, and the connecting plate 403 can be formed by bending an iron plate at one time. On the side of the connecting ditch template, two 14mm screws are used for fixing, and the crossbeam of the ditch template is placed in the slot of the ditch template bracket. On the side of the connecting rail sleeper, two 46mm T-bolts are used for connection and fixing. Since the beam 301 is provided on the ditch template 3, the lower beam 402 of the bracket passes through the door beam, and the beam is placed in the slot 406 of the connecting bracket 4 (to control the outward deviation of the ditch template), there is a certain distance between the lower beam 402 of the bracket and the ditch template 3. In this application, screws are used for fixing to adapt to the connection between the lower beam 402 of the bracket and the ditch template 3.

[0057] Preferably, the ditch template 3 is composed of a long semicircular template with a length of 1.2m and a beam 301 which are welded together to form a ditch template, wherein the dimensions of the beam 301 are 0.8m long, 0.05m wide, and 0.15m high. The purpose of setting a separate beam 301 is to fix the semicircular ditch template on the ditch template bracket.

[0058] The connecting bracket 4 is fixed to the sleeper 101 by T-bolts, and the other side of the connecting bracket 4 is fixed to the ditch template 3 by the bracket fixing screw. A connecting bracket 4 is installed every 1.2m, and the ditch templates are connected by U-shaped fasteners (third fastening components) to make the ditch smooth. After the pouring is completed, the ditch can be formed by raising the beam 301 and pulling out the ditch template 3. Compared with the previous installation process, the sleepers and T-bolts are fully utilized, and the accessories fixed on the rails are saved, thereby saving tooling costs. After using this tool, the height of the ditch structure of the prefabricated slab roadbed is met, and the smoothness and firmness of the ditch are well guaranteed, which increases the quality of the roadbed construction.

[0059] The present application discloses a main principle that the precast track slabs are prefabricated in a factory, distributed to various stations or wind shafts with reserved discharge ports, and then transported to the working surface using track-laying equipment, fixed by a special precast slab erecting device, and the ditch formwork is fixed by the precast slabs, and finally the steel fiber concrete is poured once to form an integral ballast bed, which has strong crack resistance, shear resistance, bending resistance, compression resistance and impact resistance, and effectively guarantees the paving quality of the ballast bed. Compared with the existing self-compacting concrete precast slab ballast bed, the present application only needs the initial adjustment of the precast track slabs before pouring, the installation of the ditch formwork, the reinforcement and compaction of the precast track slabs, and the fine-tuning steps of the erection of the precast track slabs, and can be cast and formed once, replacing the existing self-compacting concrete precast slab ballast bed formed by at least two pourings, greatly simplifying the construction process, significantly improving the track construction efficiency, and shortening the construction period.

[0060] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit, characterized in that: It contains the following steps: S101, construction preparation: cleaning the base and measuring and staking out the placement position of the prefabricated track slab (1), applying a waterproof isolation layer to the prefabricated track slab (1), and then transporting the painted prefabricated track slab (1) to the laying position; S102, initial adjustment of the prefabricated track slab: after the prefabricated track slab (1) reaches the laying position, a track raising frame (2) is installed at each of the four corners of the prefabricated track slab (1). After the installation is completed, the threaded screw (201) of the track raising frame (2) contacts the base, and the prefabricated track slab (1) is initially adjusted by the threaded screw (201) until the top surface of the prefabricated track slab (1) is in a horizontal state; S103, installation of the gutter template: after the initial adjustment of the prefabricated track plate (1) is completed, the gutter template (3) is installed on both sides of the prefabricated track plate (1), at least one connecting bracket (4) for connecting the gutter template (3) and the prefabricated track plate (1) is provided between the gutter template (3) and the prefabricated track plate (1), the gutter template (3) is provided with a beam (301) connected to the gutter template (3) as a whole, the connecting bracket (4) is provided with a slot (406) for limiting the beam (301), after the installation is completed, the beam (301) on the gutter template (3) is stuck in the slot (406), and the two ends of the connecting bracket (4) are respectively connected to the gutter template (3) and the prefabricated track plate (1); S104, prefabricated track slab reinforcement and compaction: after the ditch formwork (3) is installed, an inclined support (5) is installed, one end of the inclined support (5) is connected to the prefabricated track slab (1), and the other end thereof is connected to the running rail support piers (7) on both sides of the prefabricated track slab (1), and then an anti-floating device (6) is installed on both sides of the prefabricated track slab (1); S105, fine adjustment of the erection of the prefabricated track plate: after the prefabricated track plate is reinforced and compacted, the center position of the prefabricated track plate is adjusted by the oblique supports (5) on both sides until the center line of the prefabricated track plate coincides with the center line of the base, and then the height of the prefabricated track plate is detected, and the elevation position of the prefabricated track plate is adjusted by the threaded screw (201) until the design requirement is met; S106, pouring steel fiber concrete: installing isolation plates at both ends of the prefabricated track slab (1), the prefabricated track slab (1) being provided with pouring holes (102), pouring the steel fiber concrete through a pouring device (8) installed on the pouring holes (102), and after pouring to the required design height, closing the pouring device (8) and vibrating the steel fiber concrete with a vibrating rod to form an integral track bed, and when the steel fiber concrete to be filled is initially set, inserting a limiting steel bar into the pouring hole (102) and pouring concrete again until the slab surface is flush with each other to form a limiting pile; The connecting bracket (4) is composed of a bracket upper beam (401), a bracket lower beam (402), and a connecting plate (403) connecting the bracket upper beam (401) and the bracket lower beam (402); a plurality of parallelly arranged sleepers (101) are provided on the prefabricated track plate (1); after installation, the bracket upper beam (401) is fixed to the sleeper (101) via a second fastening assembly (404), and the bracket lower beam (402) is fixed to the ditch template (3) via a third fastening assembly (405); Both ends of the beam (301) are connected to the ditch template (3) to form a door beam structure, and the center line of the beam (301) is arranged parallel to the center line of the prefabricated track plate (1).

2. The method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit according to claim 1, characterized in that: The track lifting frame (2) comprises a fixing plate (202) and a threaded screw (201); the fixing plate (202) is provided with a height adjustment nut (203) matching the threaded screw (201); the fixing plate (202) is mounted on the prefabricated track plate (1) via fixing bolts (204); and the height of the prefabricated track plate (1) is adjusted by rotating the threaded screw (201).

3. The method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit according to claim 1, characterized in that: The application of the waterproof isolation layer refers to spraying a 2-3mm thick tetrahydroxy complex resin isolation layer on the bottom, both sides and ends of the prefabricated track slab, and the bonding strength of the isolation layer is above 1.0Mpa.

4. The method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit according to claim 1, characterized in that: End surface fixing plates (302) are provided at both ends of the gutter template (3), and the end surface fixing plates (302) of adjacent gutter templates (3) are fixed via a first fastening assembly (303).

5. The method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit according to claim 1, characterized in that: In the installation of the ditch template in step S103, a connecting bracket (4) is installed every other sleeper (101).

6. The method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit according to claim 1, characterized in that: The anti-floating device (6) is composed of an anti-floating fixing bracket (601) and a threaded hook (602); the anti-floating fixing bracket (601) is mounted on the prefabricated track plate (1); an adjusting nut (603) matching the threaded hook (602) is provided on the anti-floating fixing bracket (601); and the bottom hook of the threaded hook (602) is connected to a ground anchor hook (9) on the base.

7. The method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit according to claim 1, characterized in that: The oblique support (5) is composed of an adjustment sleeve (501), a first support rod (502) and a second support rod (503); one end of the first support rod (502) and one end of the second support rod (503) are simultaneously sleeved on the adjustment sleeve (501); the other end of the first support rod (502) is connected to the prefabricated track plate (1); the other end of the second support rod (503) is connected to the running rail support pier (7); the threads on the first support rod (502) and the second support rod (503) are arranged in opposite directions; by rotating the adjustment sleeve (501), the first support rod (502) and the second support rod (503) can be synchronously moved closer or farther away.

8. The method for constructing a prefabricated steel fiber concrete monolithic roadbed for urban rail transit according to claim 1, characterized in that: The pouring device (8) comprises a pouring funnel (801) installed on a pouring hole (102), and a funnel valve (802) is provided at the bottom of the pouring funnel (801).

Images