A winter construction method for ballastless track based on a mobile insulation shed

Abstract

The present invention relates to the technical field of track construction, and discloses a winter construction method for ballastless track based on a mobile insulation shed. The method comprises the following steps: laying a geotextile isolation layer on the top surface of the ballastless track base, and installing an elastic cushion layer around a limiting groove; assembling a track on a sleeper platform, hoisting the track onto a bottom steel bar by a gantry crane, installing steel formwork on both sides of the bottom steel bar, and performing a rough adjustment and then a fine adjustment on the position of the track by a fine adjustment trolley; adopting a "insulation shed + warm air cannon" method for maintenance; after the concrete initially sets, removing the track frame and formwork while using a gantry crane to pull or push the insulation shed for maintenance to the next cycle; adopting a "plastic film for moisturizing + electric blanket for heating + waterproof quilt for insulation" method for heat storage maintenance for 7 days; and continuing the "plastic film + waterproof quilt" method for insulation maintenance until the 14th day, thereby ensuring that the temperature of each process of the winter construction of the ballastless track roadbed slab meets the quality control requirements, and that high-quality ballastless track construction can be completed in winter, thereby greatly improving the progress of the project.

Description

Technical Field

[0001] The present invention relates to the technical field of track construction, and in particular to a winter construction method for ballastless track based on a movable insulation shed. Background Art

[0002] In northern central my country and the western plateau regions, winter temperatures can reach subzero temperatures. Further north or at higher altitudes, the lows can easily drop below -10°C. Excessively low temperatures significantly hinder the setting of cement and can also affect its mechanical properties after solidification. For example, winter construction of ballastless track is generally not recommended. However, refraining from ballastless track construction throughout the winter can significantly slow construction progress, significantly extending the project duration and delaying delivery. Summary of the Invention

[0003] The present invention aims to provide a winter construction method for ballastless track based on a mobile insulation shed, so as to solve the problem that ballastless track construction is difficult in winter.

[0004] The present invention is achieved through the following technical solutions:

[0005] A winter construction method for ballastless track based on a mobile insulation shed divides the construction area into five zones according to the construction sequence: track assembly zone L1, track slab bottom reinforcement binding zone L2, insulation track slab pouring zone L3, track slab heat storage and insulation maintenance zone L4, and track slab insulation and maintenance zone L5.

[0006] Carry out in L1 area: (1) Stacking and storing sleepers; (2) Separating sleepers on the jig; (3) Assembling rails on the jig.

[0007] Carry out in L2 area; (1) laying of elastic cushion and geotextile; (2) tying of reinforcement in limit groove; (3) tying of reinforcement in bottom layer.

[0008] Carry out in L3 area: (1) track installation, (2) track rough adjustment, (3) track fine adjustment, (4) limit groove reinforcement installation, (5) top layer reinforcement plate binding, (6) resistance measurement and setting, (7) concrete pouring, (8) finishing and curing.

[0009] Carry out in L4 area; (1) Use plastic film to cover for moisture retention + electric blanket to increase temperature + waterproof quilt to keep warm; (2) Maintenance period is from the 1st to the 7th day; (3) Turn off the electric blanket when the temperature is high during the day or exceeds 25℃, and turn on the heating when the temperature in the shed is less than 5℃; (4) Measure the temperature with a digital thermometer.

[0010] Carry out in L5 area; (1) Use plastic film to cover for moisture retention and waterproof quilt to keep warm; (2) The maintenance period is 8-14 days.

[0011] The steps include:

[0012] S1: Lay a geotextile isolation layer on the top surface of the ballastless track base, install an elastic cushion layer around the limiting grooves; tie the bottom steel bars and coated insulating steel bars to the geotextile;

[0013] S2: Assemble the rails on the sleeper platform. Use a gantry crane to hoist the rails onto the bottom layer of reinforcement. Install steel formwork on both sides of the bottom layer of reinforcement. Use the fine-tuning trolley to perform rough and then fine adjustments on the rails. Collect raw data. Install the top layer of reinforcement and integrated grounding, and measure resistance.

[0014] S3: Concrete is centrally produced within the mixing plant, transported by tank trucks, poured by pump trucks, and finished. The trolley is fine-tuned and re-measured for data. Curing is performed using a "heating shed + warm air gun" system. After the concrete has initially set, the track frame and formwork are removed while the gantry crane is used to pull or push the heat-insulating shed to the next curing cycle.

[0015] S4: Adopt "plastic film for moisture retention + electric blanket for heating + waterproof quilt for heat preservation" for 7 days; "plastic film + waterproof quilt" for heat preservation and curing until the 14th day;

[0016] S5: Measure the track support platform data and analyze the construction quality based on the test data.

[0017] Preferably, the geotextile and elastic cushion layer are laid out in the first step after the base surface is cleaned and dried 2 days before pouring the roadbed slab, during the hottest period of the day (ambient temperature ≥ 5°C), and covered with rain and snow protection. Before installing the elastic cushion layer, a layer of glue needs to be applied on the base surface of the base plate.

[0018] Preferably, the track rails in the second step are configured for a double-track, two-hole beam / day efficiency: L = casting length (4 holes * 32.6m beam length) + overlap length (4 * 4.91m) + casting length * 2 / 3 = 236m ≈ 240m per working surface. The track rails and top layer of rebar must be installed one day before concrete pouring and covered with rain and snow protection.

[0019] Preferably, in the second step, the gantry crane moves longitudinally across the protective wall on the running rails at the top of the cable trough, with a span of 10.15m and an effective lifting height greater than 5m, capable of crossing the top of the "insulation shed" and the hoisting rails on both sides. The gantry crane is rigidly connected and can serve as the power to pull the insulation shed forward or push it backward.

[0020] Preferably, the fine-tuning is performed at night, generally between 0:00 and 5:00, with a single-station measurement length of ≤70m, and parallel fine-tuning of the left and right lines. Each station measurement takes 2*2~3h≈5h.

[0021] Preferably, in the third step, the concrete is centrally produced using sand, gravel, water-reducing agent, and water at a mixing station. The sand and gravel are stored in a sealed silo, with a heater or heating system ensuring the raw material temperature is ≥5°C. The water is stored in an indoor pool and heated by electric heating rods to a temperature of ≤60°C. The water-reducing agent is stored in barrels indoors, with air conditioning maintaining a temperature of ≥5°C. The temperature of the concrete leaving the silo should be ≥10°C. The tank truck should be preheated with hot water before loading the concrete and covered with an insulation cover to ensure the concrete enters the mold at a temperature of ≥5°C. Concrete pouring should be completed during daytime hours when the ambient temperature is ≥5°C, generally between 10:00 and 16:00.

[0022] As a preferred embodiment, the three-step insulation shed includes a color steel tile insulation roof, 5cm square steel longitudinal ribs, 10cm square steel transverse frame, end color steel tile insulation gable, thermometer, 5cm triangular reinforcement square steel, 10cm rigid connection square steel, D longitudinal running rubber wheel, 5cm square steel guide wheel fixing frame, 10cm square steel column, 10cm square steel longitudinal frame, transverse wire rubber wheel, end insulation waterproof quilt, side insulation waterproof quilt and warm air gun, etc.

[0023] Each section of the insulation shed is 11m long, and is combined with the insulation of the 2-hole box beam and individually moved to meet the requirements of the removal of 2 sections of rail tracks. It is 6*11m+1*11m long and has a span of 9.25m.

[0024] The running wheels are fixed to the 10cm square steel at the bottom of the insulation shed. Each section is equipped with four pairs of running wheels, each pair with two main wheels and two auxiliary wheels, which can move longitudinally on the top of the protective wall. The auxiliary wheels can ensure that the insulation shed can smoothly cross the manhole on the protective wall.

[0025] The guide wheel is attached to the insulation shed bracket with square steel, and can move longitudinally inside the protective wall to ensure that the insulation shed does not fall off when moving longitudinally on the protective wall. It is installed at the position of the main wheel of the running wheel.

[0026] The insulation shed bracket is welded from square steel, with a triangular ridge, a crossbeam 1.8m higher than the beam surface, and a top 3m higher than the beam surface, which neither affects the passage of people in the insulation shed nor affects the door crane crossing the insulation shed hoisting rail row;

[0027] The insulation ceiling is made of insulation foam colored steel tiles, and the quilt is a rainproof quilt, which is hung on both sides of the insulation shed, covering the protective wall by 30cm, and hanging at the end to cover the beam surface;

[0028] The heater gun is placed at both ends of the insulation shed to ensure that the indoor temperature is 5°C ≤ T ≤ 30°C. A temperature control switch is installed on the power line. When the temperature is less than 5°C, it is turned on. When it is greater than 30°C, the heater gun is turned off.

[0029] Thermohygrometers are hung on the horizontal square steel of the triangular roof ridge, with one each at both ends and in the middle. The indoor temperature should be no less than 5°C. The aforementioned one-day curing is carried out before the ambient temperature drops below 5°C. After the subsequent heat storage curing of "plastic film moisturizing + electric blanket heating + waterproof quilt insulation", the gantry crane can be used to pull the gantry crane forward to proceed to the next process. The specific cycle time is determined by the cycle time of the trackbed plate.

[0030] Preferably, in step 8, the third step of using a gantry crane to pull or push the insulation shed is achieved by using a 10cm rigid connecting square steel on the insulation shed. The rigid connecting square steel consists of connecting bolts, connecting steel plates, reinforcing square steel, latches, and pushing and pulling square steel.

[0031] The push-pull square steel is welded to the reinforcing square steel and latches to form a single piece. The other end of the reinforcing square steel is welded to a connecting steel plate. The push-pull square steel is inserted into the 10cm longitudinal square steel at the bottom of the insulation shed via the latch. The connecting steel plate is then bolted to the 10cm longitudinal square steel, ensuring that the gantry crane's pulling / pushing force is transmitted to the insulation shed. This rigid connection allows for quick installation and removal, ensuring the gantry crane can pass across the insulation shed.

[0032] Preferably, the plastic film in step 4 is 4m wide and 100m long per roll, with a thickness greater than 0.04mm (4 filaments). In addition to locking in the concrete's own moisture, the moisturizing step can be sprayed with water at a temperature greater than 10°C before covering to ensure the concrete's hydration thermal reaction.

[0033] Preferably, each electric blanket in the fourth step is 4m wide and 6m long, connected in series with the main cable through a socket, and provided with a thermostat;

[0034] The thermostat includes a probe and a controller. One end of the controller is connected to the probe, and the other end is connected to the input and output terminals of the main power supply. The probe is placed at the input end of the power line at the two double-block rail sleeper support platforms of the first thermal storage maintenance trackbed. When the concrete surface temperature is 25°C < T, the thermostat can disconnect the main power supply. When T < 5°C, it will turn on the power supply.

[0035] The main power supply is drawn from the three-level distribution box of the cable trough, connected to the thermostat, and multiple plug-in boards are connected in series. The main power supply is turned on and off by the thermostat. The plug-in board can power four electric blankets adjacent to the left and right lines.

[0036] Preferably, each waterproof quilt in the fourth step is 4m wide and 6m long, with the quilt facing downward on the back and the rainproof canvas facing upward on the front.

[0037] Preferably, the 7-day curing in the fourth step can ensure that the concrete is not frozen before reaching 60% of the design strength, and the continuous curing for 7 days can ensure the later growth strength of the concrete;

[0038] The data of the track support platform shall be re-measured in time after the track tooling is removed, and the winter construction shall be adjusted to re-measured after 14 days of maintenance.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] 1. The winter insulation and maintenance method for high-speed railway ballastless track slabs provided by the present invention effectively utilizes the gantry crane and power supply used for the ballastless track slabs and the protective wall of the box girder structure itself, and meets the requirements of the segmented construction process and process organization connection of the slabs.

[0041] 2. The tooling adopts a self-made square steel frame insulation shed, which is simple to process, has a solid structure, and is assembled in sections to ensure the insulation effect of the construction process. The heaters, plastic films, electric blankets, waterproof quilts and temperature control devices used can be purchased on the market and recycled, which can ensure the efficiency and quality of a single working surface roadbed to complete 130m per day in winter, and propose a new idea for winter construction of ballastless track.

[0042] 3. The present invention combines the ballastless track slab process with temperature control during concrete mixing plant production, tank truck transportation, and mold entry. After pouring, the present invention implements measures such as "enclosed insulation shed + warm air cannon heating" for one day, "moisturizing with plastic film + heating with electric blanket + insulation with waterproof quilt" for seven days, and "plastic film + waterproof quilt" continuous curing for seven days. These measures ensure that the temperature of each winter construction process of the ballastless track slab meets quality control requirements, enabling high-quality ballastless track construction to be completed in winter, greatly improving project progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0044] Figure 1 It is the longitudinal section of the straight / curved ballastless track slab in the bridge section for winter construction;

[0045] Figure 2 It is the winter construction zoning plan of the straight / curved ballastless track slab in the bridge section;

[0046] Figure 3 It is a cross-sectional diagram of the insulation system and covering maintenance system of the insulation shed;

[0047] Figure 4 yes Figure 3 A magnified view of point A;

[0048] Figure 5 It is the cross section of the track fixture system and ballastless track bed structure;

[0049] Figure 6 It is a plan view of a rigid connection detail drawing;

[0050] Figure 7 This is a large-scale plan view of the temperature control switch.

[0051] The reference numerals represent: 1-door crane, 2-insulation shed, 201-color steel tile insulation ceiling, 202-triangular reinforcement square steel, 203-square steel column, 204-side insulation and waterproof quilt, 206-longitudinal running rubber wheel, 22-rigid connection square steel, 2201-square steel latch, 2202-square steel diagonal brace, 2203-pushing and traction square steel, 2204-connecting steel plate, 2205-connecting bolt, 23-protective wall, 3-heat gun, 4-thermohygrometer, 401-probe, 5-rail, 5 01-Adjustable legs, 502-Positioning beam, 503-Longitudinal rails, 504-Rail braces, 505-Buckle accessories, 6-Double-block sleepers, 7-Insulation quilts, 8-Windproof cables, 9-Heating electric blankets, 10-Moisturizing plastic film, 11-Power cord, 13-Temperature control switch, 14-Steel formwork, 15-Formwork braces, L1-Rail assembly area, L2-Ballad slab bottom reinforcement binding area, L3-Insulation roadbed pouring area, L4-Roadbed heat storage and insulation maintenance area, L5-Roadbed insulation maintenance area. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0053] Examples, such as Figures 1 to 7 As shown, a winter construction method for ballastless track based on a mobile insulation shed includes the following steps:

[0054] S1: Lay a geotextile isolation layer on the top surface of the ballastless track base, install an elastic cushion layer around the limiting groove, and tie the bottom steel bars and coated insulating steel bars on the geotextile;

[0055] like Figure 1 and Figure 2 As shown, in step S1, the specific steps of the geotextile are as follows:

[0056] S11. Two days in advance, during the daytime high temperature period (ambient temperature ≥ 5°C), clean the top surface of the base, dry it, apply 10cm wide glue horizontally around the perimeter and the top surface of the limit groove and in the middle of the board, apply glue at the bottom of the limit groove, and lay geotextile C6;

[0057] S12. The elastic cushion layer includes an elastic pad and a foam board, which are assembled in advance with adhesive tape. The longitudinal A-type pad is 900mm long, and the transverse B-type pad is 600mm long, 110mm wide, and 8mm thick. In winter, in addition to applying a layer of glue on the elastic cushion layer, an additional layer of glue should be applied to the inner wall of the limiting groove. After pasting, use a rubber hammer to tap the glue tightly to prevent the low temperature from affecting the glue adhesion effect. Use a tying jig to tie the coated steel bars and install them in the limiting groove. The coating must not be damaged.

[0058] S13. Use insulation cards to tie the bottom steel bars on the geotextile to ensure that the steel bars do not touch each other. The insulation resistance of the tail-type insulation binding tape is greater than 1Ω, and plastic film is covered in time to prevent rain and snow.

[0059] S2: Complete the work of assembling the track 5 on the sleeper platform at , then hoist the track 5 to , hoist the track 5 onto the bottom reinforcement by the gantry crane 1 at , install the steel formwork 14 on both sides of the bottom reinforcement, use the fine-tuning trolley to make a rough adjustment and then a fine adjustment on the position of the track 5, collect the original data, then install the top reinforcement and perform comprehensive grounding, and measure the resistance.

[0060] like Figure 4 As shown;

[0061] S21. Install the sleeper separation platform tooling on the base plate and assemble the rail row 5 quickly and accurately. Manual sleeper separation is strictly prohibited.

[0062] S22, using the gantry crane 1 to hoist the rail row 5 onto the bottom steel bar, and installing the steel formwork 14 around the track bed;

[0063] S23, use the fine adjustment trolley to perform rough adjustment on the rail 5, complete fine adjustment at night, and collect raw data. The fine adjustment needs to be performed at night, generally between 0:00 and 5:00, with a single station measurement length of ≤70m. The left and right lines are fine-tuned in parallel, and each station measurement takes 4-6 hours;

[0064] S24, installing top steel bars on rail row 5 and performing comprehensive grounding;

[0065] S25. Use a megohmmeter to measure resistance. Rail 5 and the top steel bars must be installed one day before concrete pouring and covered with rain and snow to ensure that concrete can be poured during the high temperature period on the second day.

[0066] Advantageously, the gantry crane 1 crosses the protective wall 23 and moves longitudinally on the running rails at the top of the cable trough, with a span of 10.15m and an effective lifting height of >5m. It can cross the top and both sides of the insulation shed 2 and the lifting rails 5. The gantry crane 1 is connected to the insulation shed 2 through a rigid connector. The gantry crane 1 can serve as a power for pulling the insulation shed 2 forward or pushing it backward, thereby being driven by the gantry crane 1.

[0067] like Figure 6As shown, the template tooling includes a steel template 14, a template diagonal brace 15 and a positioning steel bar. The template diagonal brace 15 has a ring at one end and a 90° hook at the other end, and is connected in the middle by a threaded connection; the diagonal brace hook section is inserted into the back rib hole of the steel template 14, and the ring end is placed on the positioning steel bar or horizontally placed on the protective wall 23. The template position is adjusted by adjusting the threaded connection.

[0068] The positioning steel bars are 20mm diameter threaded steel bars. Use an electric drill to drill a 10cm deep hole on the beam surface and insert the steel bars, leaving 10cm of the steel bars exposed.

[0069] In this embodiment, the track panel 5 assembly comprises adjustable legs 501, a positioning beam 502, longitudinal rails 503, track braces 504, and fasteners 505. The rails are P60kg / m rails, consistent with the line rail type, ensuring that the track surface elevation after fine-tuning is consistent with the designed track surface elevation. The longitudinal position of the track panel 5 is fixed by a connecting plate. The adjustable legs 501 are connected to the end of the positioning beam 502 using a screw rod, and the height of the track panel 5 can be adjusted by turning the screw rod. The track panel 5 is supported at one end by the positioning beam 502 and at the other end by the embedded steel bars or protective wall 23 on the beam surface. The connection is made via a threaded connection, and the precise lateral position of the track panel 5 can be ensured by adjusting the threaded connection. The track 5 tooling is configured in sections, which can ensure that the spacing between sleepers of different track bed lengths such as 4910mm, 5570, and 6200 is 600mm<d<650mm. The track 5 tooling is configured according to the daily work efficiency of double-track 2-hole beams, L=casting length (4 holes*beam length 32.6m) + overlap length (4*4.91m) + casting length*2 / 3=236m≈240m / working surface configuration.

[0070] S3. Concrete is centrally produced in the mixing station, transported by tank trucks, poured by pump trucks, and finished; the data is re-measured by the fine-tuning trolley; it is cured using the "insulation shed 2 + warm air cannon 3" system. After the concrete has initially set, the rail 5 frame and formwork are removed while the gantry crane 1 is used to pull or push the insulation shed 2 for curing to the next cycle.

[0071] In step S3, concrete is centrally produced at the mixing station. Sand and gravel are stored in a sealed silo. A heater 3 or heating is used to ensure that the temperature of the raw materials is ≥5°C. Mixing water is stored in an indoor pool and heated by an electric heating rod. The upper limit of the water temperature is 60°C. The water reducer is stored in barrels indoors. The indoor air-conditioning insulation temperature is ≥5°C. The temperature of the concrete out of the silo should be ≥10°C. The temperature is measured and recorded once in the morning, noon and evening to ensure that the temperature of the raw materials meets the standard.

[0072] Advantageously, the tank truck should be preheated with hot water before loading concrete and wrapped with an insulation cover to ensure that the temperature of the concrete entering the mold is ≥5°C. At the same time, the pump truck uses the sidewalk to occupy a position, and the operating radius can cover the concrete pouring of the left and right double-track 4-hole beam roadbed slabs. The height meets the pier height requirements. Concrete pouring should be completed when the ambient temperature is ≥5°C during the day, generally between 10:00 and 16:00.

[0073] In this embodiment, it takes about 3 hours to pour concrete. After 2 hours of initial setting after pouring, the surface is finished and the original data of the rails are remeasured using a fine-tuning trolley. Before the ambient temperature is less than 0°C, the gantry crane 1 is used to pull the insulation shed 2 to close the track bed plate, and the warm air cannon 3 is turned on for temperature maintenance. About 4 hours after the concrete is finally set, it is moved from back to front section by section, and the insulation shed 2 is removed at a moving distance of 11 meters each time. The insulation shed 2 then cleans the surface of the track bed plate and then covers it with "plastic film + electric blanket + waterproof quilt" for heat storage maintenance. After the rail row 5 and the formwork are completely removed, the initial maintenance of "insulation shed 2 + warm air cannon 3" is transformed into "heat storage maintenance". The insulation shed 2 can proceed to the next cycle, which is organized as one cycle per day.

[0074] In this embodiment, the insulation shed 2 includes a color steel tile insulation ceiling 201, triangular reinforced square steel 202, rigidly connected square steel 22, longitudinal running rubber wheels 206, square steel columns 203, and side insulation and waterproof quilts 204. A warm air gun 3 is provided in the insulation shed 2, and the warm air gun 3 is used to provide heat to the insulation shed 2. The insulation shed 2 moves on the protective wall 23 through the longitudinal running rubber wheels 206.

[0075] Each section of the insulation shed 2 is 11 meters long. The combined length, based on the insulation of a two-hole box girder and the individual relocation requirements to meet the rail 5 removal requirements, is 6*11m + 1*11m long, with a span of 9.25m. The running wheels are fixed to the bottom of the insulation shed 2 under a 10cm square steel bar. Each section is equipped with four pairs of running wheels, each pair with two main wheels and two auxiliary wheels, enabling longitudinal movement on top of the protective wall 23. The auxiliary wheels ensure that the insulation shed 2 can smoothly cross the manhole on the protective wall 23.

[0076] The guide wheel is attached to the bracket of the insulation shed 2 using 5cm square steel. It can move longitudinally inside the protective wall 23 and ensure that the insulation shed 2 does not fall off when moving longitudinally on the protective wall 23. It corresponds to the main running wheel setting. The bracket of the insulation shed 2 is welded from 10cm and 5cm square steel, with a triangular ridge. The crossbeam is 1.8m higher than the beam surface, and the top is 3m higher than the beam surface. The insulation ceiling is made of insulating foam colored steel tiles. The quilt is a rainproof quilt, which is hung on both sides of the insulation shed 2, covering the protective wall 2330cm and hanging at the end to cover the beam surface. The heater 3 is placed at both ends of the insulation shed 2 to ensure that the indoor temperature is 5℃≤T≤30℃. A temperature control switch 13 is installed on the power cord 11. It turns on when the temperature is less than 5℃ and turns off when it is greater than 30℃. The thermometer and hygrometer 4 are hung on the horizontal square steel of the triangular ridge, with one set at each end and in the middle. The indoor temperature is not less than 5℃, and the temperature is measured and recorded every 2 hours.

[0077] Maintain for 1 day, and close the maintenance before the ambient temperature is less than 5℃. After the subsequent heat storage maintenance of "plastic film moisturizing + electric blanket heating + waterproof quilt insulation", the gantry crane 1 can be used to pull forward to proceed to the next process. The specific cycle time is determined according to the cycle time of the track bed plate.

[0078] like Figure 6 As shown, the rigid connection square steel 22 is composed of connecting bolts 2205, square steel pins 2201, connecting steel plates 2204, square steel diagonal braces 2202 and pushing and pulling square steels 2203. The pushing and pulling square steels 2203 are welded into a whole with the reinforcing square steels and pins. The other end of the reinforcing square steel is welded to the connecting steel plate 2204. The pushing and pulling square steels 2203 are inserted into the longitudinal 10 cm square steel at the bottom of the insulation shed 2 through the pins, and are connected to the longitudinal 10 cm square steel bolts through the connecting steel plate 2204 to ensure that the door crane 1 transmits the pulling or pushing force to the insulation shed 2. The rigid connection can be quickly installed and removed to ensure that the door crane 1 can pass across the insulation shed 2.

[0079] S4. Use "plastic film for moisture retention + electric blanket for heating + waterproof quilt for insulation" to store heat for 7 days, and "plastic film + waterproof quilt" to continue insulation maintenance until the 14th day, measure the track platform data and analyze.

[0080] like Figure 4 As shown, after the track panel 5 fixture and formwork are hoisted and removed, if the surface of the roadbed slab is dry, spray it with 10°C warm water to moisten it, fill the beam joints with felt, and cover it with plastic film. The plastic film should be 4m wide and 100m long per roll, with a thickness of more than 0.04mm (4 wires). The plastic film should fully cover the roadbed slab to keep it moist, lock in the moisture of the concrete itself, and ensure the hydration heat reaction of the concrete.

[0081] like Figure 4As shown, electric blankets are covered in plastic film. Each blanket is 4m wide and 6m long, connected in series to the main power supply via a socket, and equipped with a thermostat. The thermostat includes a probe 401 and a controller, preferably a temperature-controlled switch 13. One end of the temperature-controlled switch 13 is connected to the probe 401, and the other end is connected to the input and output terminals of the main power supply. The probe 401 is placed on the treads of the two double-block sleepers 6 of the first thermal storage and maintenance trackbed slab at the input end of the power line 11. When the concrete surface temperature is 25°C < T, the thermostat disconnects the main power supply, and when T is < 5°C, the power supply is connected for heating.

[0082] The main power supply is drawn from the three-level distribution box of the cable trough, connected to the thermostat, and multiple plug-in boards are connected in series. The main power supply is turned on and off by the thermostat. The plug-in board can power four electric blankets adjacent to the left and right lines.

[0083] Lay a waterproof blanket, 4m wide and 6m long, on top of the electric blanket, with the back facing downward and the front facing upward. Install windproof cables 8 and sandbags on the blanket to prevent it from being blown away by the wind. Install a digital thermometer probe 401 on the tread between two sleepers. Place the thermometer flat on the blanket and measure the temperature every two hours, keeping records.

[0084] Curing for 7 days can ensure that the concrete will not be frozen before it reaches 60% of the design strength. The continuous curing for 7 days can ensure the later strength growth of the concrete.

[0085] The data of the track support platform shall be re-measured in time after the track 5 tooling is removed. During winter construction, the data shall be adjusted to 14 days of maintenance before the covering is removed and then re-measured.

[0086] According to the above invention, the construction quality and construction efficiency of ballastless track slab in winter can be ensured, and the maintenance effect can be confirmed by making 3d, 7d and 14d experimental blocks with the same conditions for pressure testing and entity rebound.

[0087] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A winter construction method for ballastless track based on a mobile insulation shed, characterized in that: The steps include: S1: Lay a geotextile isolation layer on the top surface of the ballastless track base. After the geotextile isolation layer is laid, install an elastic cushion layer around the limiting grooves. Then, tie the bottom steel bars and coated insulating steel bars on the geotextile. S2: Assemble the rail (5) on the sleeper platform, hoist the rail (5) onto the bottom steel bar by the door crane (1), install the steel template (14), and perform rough and fine adjustment on the installation position of the rail (5) by the fine adjustment trolley to ensure that the rail (5) is installed in place, then collect the original installation data, and then install the top steel bar and integrated grounding, and measure the resistance; S3: Concrete is centrally produced in the mixing station, transported by tank trucks, poured by pump trucks, and finished after pouring. The installation position data is re-measured by a fine-tuning trolley. Curing is carried out using a "heating shed (2) + warm air gun (3)". After the concrete has initially set, the rail (5) frame and formwork are removed while the gantry crane (1) is used to pull or push the heat-insulating shed (2) for curing until the next cycle. S4: Adopt "plastic film for moisture retention + electric blanket for heating + waterproof quilt for heat preservation" for 7 days. After 7 days of heat storage curing, continue heat preservation curing with "plastic film + waterproof quilt" until the 14th day; S5: Measure the rail support platform data and analyze the construction quality based on the test data; In step S3, each section of the insulation shed (2) is 11m long, and the combined length is combined according to the distance between the two-hole box beams. After the combination, the insulation is carried out and the two sections of rails (5) are removed separately to meet the removal requirements. The span of the insulation shed is 9.25m. The bottom of the insulation shed (2) is provided with running wheels, and each section is provided with 4 pairs of running wheels, and each pair is provided with 2 main wheels and 2 auxiliary wheels, which can move longitudinally on the top of the protective wall (23). The auxiliary wheels can ensure that the insulation shed (2) can smoothly cross the protective wall (23) and pass through the manhole; The guide wheel is attached to the bracket of the heat preservation shed (2) by using square steel, and can move longitudinally inside the protective wall (23), and ensures that the heat preservation shed (2) does not fall off when moving longitudinally on the protective wall (23). The guide wheel is installed at the position of the main wheel of the running wheel; The insulation shed (2) bracket is welded from square steel, with a triangular ridge, a crossbeam 1.8m higher than the beam surface, and a top 3m higher than the beam surface; The insulation ceiling is made of insulation foam colored steel tiles, and the quilt is a rainproof quilt, which is hung on both sides of the insulation shed (2). The lower end of the rainproof quilt covers the protective wall (23) by 30 cm and is hung at the end to cover the beam surface; The heating gun (3) is placed at both ends of the heat preservation shed (2) to ensure that the temperature in the shed is 5°C ≤ T ≤ 30°C. A temperature control switch (13) is installed on the power line (11). When the temperature is less than 5°C, the heating gun (3) is turned on. When the temperature is greater than 30°C, the heating gun (3) is turned off. Thermohygrometer (4) is hung on the horizontal square steel of the triangular roof ridge, with one set at each end and the middle. The indoor temperature is not less than 5℃, and it is cured for 1 day. It is closed and cured before the ambient temperature is less than 5℃. After the subsequent "plastic film moisturizing + electric blanket heating + waterproof quilt insulation" heat storage curing, it can be pulled forward by the door crane (1) to proceed to the next process. The specific cycle time is determined according to the cycle time of the roadbed plate; In step S3, the heat preservation shed (2) is pulled or pushed by the door crane (1) and moved by a 10 cm rigid connecting square steel (22) on the heat preservation shed (2). The rigid connecting square steel (22) is composed of a connecting bolt (2205), a connecting steel plate (2204), a reinforcing square steel, a latch and a pushing and pulling square steel (2203); The pushing and pulling square steel (2203) is welded to the reinforcing square steel and the latch into a whole, and the other end of the reinforcing square steel is welded to the connecting steel plate (2204). The pushing and pulling square steel (2203) is inserted into the longitudinal 10 cm square steel at the bottom of the insulation shed (2) through the latch, and is connected to the longitudinal 10 cm square steel bolts through the connecting steel plate (2204), ensuring that the door crane (1) pulls or pushes the force on the insulation shed (2). The rigid connection can be quickly installed and removed, ensuring that the door crane (1) can pass through the insulation shed (2).

2. The winter construction method of ballastless track based on a mobile insulation shed according to claim 1 is characterized in that: In step S1: The geotextile and elastic cushion layer are cleaned and dried 2 days before the roadbed is poured, and then laid during the hottest period of the day, and the ambient temperature during the hottest period is ≥5°C. After laying, they are covered with rain and snow protection facilities for protection. Before installing the elastic cushion layer, a layer of glue needs to be applied on the base surface of the base plate.

3. The winter construction method of ballastless track based on a mobile insulation shed according to claim 1, characterized in that: The rails (5) are configured according to the daily work efficiency of a double-track, two-hole beam. The rails (5) and the top steel bars need to be installed one day before concrete pouring and covered to prevent rain and snow.

4. The winter construction method of ballastless track based on a mobile insulation shed according to claim 1, characterized in that: In step S2, the gantry crane (1) crosses the protective wall (23) and moves longitudinally on the running rail at the top of the cable trough, with a span of 10.15m and an effective lifting height of >5m, and can cross the top of the insulation shed (2) and the lifting rails (5) on both sides. The gantry crane (1) is rigidly connected to the insulation shed (2) and can serve as a power for pulling the insulation shed (2) forward or pushing it backward.

5. The winter construction method of ballastless track based on a mobile insulation shed according to claim 1, characterized in that: The fine-tuning needs to be carried out at night, from 0:00 to 5:00 in winter and from 18:00 to 23:00 in summer. The measurement length of a single station is ≤70m. The left and right lines are fine-tuned in parallel. Each station measurement takes 4-6 hours.

6. The winter construction method of ballastless track based on a mobile insulation shed according to claim 1, characterized in that: In step S3, the concrete is centrally produced from sand, gravel, water reducing agent and water using a mixing station. The sand and gravel are stored in a silo, which is sealed. A warm air gun (3) or heating is used to ensure that the temperature of the raw materials is ≥5°C. The water is stored in an indoor pool and heated by an electric heating rod. The water temperature is ≤60°C. The water reducing agent is stored in barrels indoors. The indoor air conditioner is kept warm at ≥5°C. The temperature of the concrete leaving the silo should be ≥10°C. The tank truck should be preheated with hot water before loading the concrete and wrapped with a heat preservation cover to ensure that the temperature of the concrete entering the mold is ≥5°C. The pouring of concrete is completed when the ambient temperature during the day is ≥5°C and is completed between 10:00 and 16:

00.

7. The winter construction method of ballastless track based on a mobile insulation shed according to claim 1, characterized in that: In step S4, the plastic film is 4m wide, 100m long / roll, and thicker than 0.04mm. In addition to locking the moisture of the concrete itself, the moisturizing film is sprayed with water with a temperature of >10°C before covering to ensure the thermal reaction of concrete hydration.

8. The winter construction method of ballastless track based on a mobile insulation shed according to claim 1, characterized in that: In step S4, each of the electric blankets is 4m wide and 6m long, connected in series to the main cable via a socket, and is provided with a thermostat. Each of the waterproof quilts is 4m wide and 6m long, with one side being the quilt and the other side being the rainproof canvas. When laying, the rainproof canvas is laid upwards. The temperature controller comprises a probe (401) and a controller, one end of the controller is connected to the probe (401), and the other end is connected to the input and output terminals of the main power supply, the probe (401) is placed at the input terminal of the power line (11) at the two double-block sleepers (6) of the first heat storage maintenance track bed plate, and when the concrete surface temperature T>25°C, the temperature controller can disconnect the main power supply, and when T<5°C, the power supply can be turned on; The data of the rail support platform shall be re-measured in time after the rail track (5) tooling is removed, and the winter construction shall be adjusted to re-measured after 14 days of maintenance; The main power supply is drawn from the three-level distribution box of the cable trough, connected to the thermostat, and multiple plug-in boards are connected in series. The main power supply is turned on and off by the thermostat. The plug-in board can power four electric blankets adjacent to the left and right lines.

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