Turnout inserting and paving construction method for existing ballast line

Abstract

The invention discloses a turnout inserting and paving construction method for an existing ballast line. The method comprises the following steps that S1, a turnout moving track path is determined; s2, preparation before construction; s3, the existing ballast line track is dismantled; s4, the turnout is moved; s5, the turnout is lifted; s6, arranging a transverse moving device; s7, turnout posture adjustment; s8, turnout line entering; s9, backfilling the railway ballast; s10, turnout welding; and S11, performing line final adjustment. The method has the beneficial effects that simulation optimization of a turnout moving track is carried out, a turnout overall moving mode is adopted, posture adjustment is carried out through the transverse moving device and the fine adjustment device, the limitation of existing inserting and laying conditions is broken through, the turnout operation efficiency within the existing ballast line business line range is improved, and the working efficiency is improved. The method realizes the construction of inserting the large-size turnout into the existing ballast line in a narrow space, and is particularly suitable for the construction of integrally inserting the large-size turnout into the existing line in a long-distance longitudinal moving manner when the site is limited and the working surface is compact.

Description

Technical Field

[0001] The invention relates to the technical field of track turnout construction, in particular to a turnout insertion and laying construction method for an existing ballasted track. Background Art

[0002] With the continuous deepening and improvement of my country's high-speed rail network construction, a large number of new lines need to be introduced into existing stations. The construction of turnouts on existing ballasted lines has laid the foundation for large-scale speed increase, timetable adjustment and capacity expansion of railways. At present, there are many types of turnouts in China. Turnouts are classified by number, including 6, 7, 8, 9, 12, 18 and large numbers (such as 30, 42, 60 turnouts). The single-opening turnouts commonly used in the main operating railway trunk lines are 9, 12, and 18. Large-number turnouts are mainly used for connecting lines that require higher speeds for lateral lines. Passenger dedicated lines are mainly No. 18 turnouts. Turnouts such as No. 6, No. 7 and No. 8 are mainly used for special lines for industrial and mining enterprises or freight stations. For the insertion of small-number turnouts, due to their small size, they can usually be installed and constructed at the insertion point, while for large-number turnouts, corresponding assembly sites are usually required to assemble the turnouts. As for the reconstruction of existing ballasted lines, if the site assembly conditions are relatively good, the insertion and laying environment is relatively wide, and there is no interference from existing equipment, the insertion and laying operation can be carried out according to existing methods, such as the "first horizontal movement and then short-distance vertical movement" method and the "change the laying equipment and pull the whole set into place at one time" method. However, not all existing ballasted lines have good insertion and laying conditions. For example, the early line design did not originally design a fork. The increase in traffic at any time will require the design of a single turnout or even multiple turnouts. The early line points will have complex working conditions within the operating line range, such as narrow construction sites, compact working surfaces, or serious interference from existing equipment (signals, contact lines, hard crossovers, existing turnout switch machines, transformer boxes, etc.). The existing insertion and laying operation efficiency is low, and it often has to go through multiple horizontal and vertical adjustments. Among them, the construction technology of inserting the No. 42 turnout into the existing ballasted line has not made any breakthrough progress. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a construction method for inserting turnouts on an existing ballasted track, which can break through the limitations of existing insertion conditions, improve the turnout operation efficiency within the operating line of the existing ballasted track, and realize the construction of inserting large-number turnouts into the existing ballasted track in a small space.

[0004] The object of the present invention is achieved through the following technical scheme: a turnout insertion construction method for an existing ballasted track, comprising the following steps: S1. Determine the track path for turnout movement: determine the optimal track path for turnout movement according to the insertion position and the turnout movement direction; S2. Preparation before construction: Use the skylight point before the insertion and complete the hard isolation installation and point marking at the insertion position. At the same time, lay the running rail according to the optimal turnout moving track path. The laying of the running rail can be carried out according to the existing track laying method. Specifically, a 2.5m long wooden sleeper is arranged at a spacing of no more than 5m, and a pair of 60cm long short wooden sleepers are arranged between the long wooden sleepers. The long wooden sleepers are nailed with special pulleys for rail extraction. The 50kg / m tool rail is manually moved to the wooden sleeper pulley using a crowbar, a track turner, etc., and the direction of the running track is adjusted. A 60cm long and short sleeper is added between the long wooden sleepers, and wooden boards are set on the short sleepers to level the track. During operation, the technicians determine the running line according to the 5m point position. The running line is designed according to the radius of 5000m of the No. 42 turnout guide curve. The outer edge spacing of the pulleys nailed on the long wooden sleepers for rail extraction is controlled at 1435mm±5mm, and the centers of the wooden sleepers of the two pulleys are marked in advance. After the running rails are laid, check the line level in time and control the level within 5mm; S3. Dismantling of existing ballasted track: saw the existing ballasted track according to the insertion position within the skylight point, dismantle the rails and sleepers sawed off in the section where the insertion position is located, and inspect the bottom of the track bed.

[0005] According to the influence of existing equipment (contact network columns, CPIII), it is preferred to use oxygen cutting to cut the turnout core rails, and use rail sawing machines to saw the rest of the rails as much as possible.

[0006] The bottom inspection of the track bed is the first important link in the construction process. The control of the bottom inspection reaching the standard will directly affect the quality of the project after opening. According to the division of the ballast removal unit, the ballast removal operation is carried out at the same time, and the level instrument uses the elevation of the existing track surface as the control point, and sets the measurement point in advance according to the 5m dot mark, and conducts a bottom inspection depth review to ensure that the bottom inspection depth is not less than 100mm. Avoid the phenomenon that the track row cannot fall due to insufficient bottom inspection width and depth.

[0007] S4. Moving turnouts: Using the laid running rails, move the assembled turnouts to the insertion position by a tractor; the turnouts can be assembled in the corresponding assembly area. When the turnout sleepers and rails are basically hoisted in place, start preparing to assemble the turnouts. The laying order is the point rail and base rail, movable heart rail switch, and guide rail. First, adjust the theoretical center of the movable heart rail to the pre-calibrated position, adjust the position of the base rail and the point rail, mainly to ensure the distance between the tip of the point rail and the theoretical center of the movable heart rail, and generally use a total station to lay out the points for confirmation.

[0008] S5, Lifting the turnout: After the turnout is moved into position, the turnout is lifted by the lifting cylinder group installed on the tractor, and then a safety pile is set up under the turnout to remove the tractor and the running rails under the turnout; S6. Dropping the turnout: arrange a transverse shifting device and a movable lifting cylinder group under the turnout, lift the turnout through the movable lifting cylinder group, move it out of the safety pile, drop the turnout onto the transverse shifting device, and take out the movable lifting cylinder group; the transverse shifting device adopts the patent number 202323564353.8 published by the applicant, and the patent name is "A transverse shifting device for inserting and laying turnouts on existing lines", and the transverse shifting device is not described in detail here.

[0009] S7, turnout attitude adjustment: Use the lateral movement device to adjust the turnout in the general direction until the lateral movement distance of the turnout is less than 2cm, arrange the movable lifting cylinder group under the turnout, lift the turnout by the movable lifting cylinder group, move it out of the lateral movement device, and then install the fine adjustment device under the turnout, drop the turnout on the fine adjustment device, take out the movable lifting cylinder group, and adjust the turnout by the fine adjustment device until the lateral movement distance is less than 5mm, completing the turnout attitude adjustment; S8, turnout line entry: install a movable lifting cylinder group under the turnout, lift the turnout through the movable lifting cylinder group, remove the fine adjustment device, and then cooperate with the movable lifting cylinder to control the track surface elevation of the turnout (cooperate with the level), connect the joints with splints, and the turnout line entry is completed; the track surface elevation control in step S8 means that the track surface elevation of the turnout is based on the existing ballasted track track surface elevation, with a reserved 20mm control, and the slope is made from the turnout head and turnout tail to the turnout, and the curve side is controlled by 0.5mm lower than the straight line. In step S8, a 5-8mm weld is left at the joint.

[0010] S9, backfilling ballast: after the turnout is put into line, the ballast is backfilled at the insertion position and tamped and maintained, and welding seams are reserved. During the backfilling process, the movable lifting cylinder is moved out; in step S9, the ballast is first backfilled at the movable lifting cylinder point below the turnout. During the backfilling process, the ballast is backfilled in sections, and the turnout is adjusted for elevation and orientation during the sectioned backfilling.

[0011] S10, turnout welding: After the tamping maintenance meets the standards, the turnout is welded to the existing ballasted line and the ballasted line to be connected respectively; in step S10, the turnout is welded to the existing ballasted line first, and the turnout is welded to the ballasted line to be connected the next day. Before welding, the turnout rails at the pre-welding part of the turnout can be polished in advance and wrapped with geotextile to avoid pollution; after the existing line is dismantled and the turnout is in place, the existing line to be welded should be polished in time; after the manual road maintenance meets the standards and the broken rail emergency device is removed, the welding part needs to be polished again before thermite welding can be carried out. When the turnout and the line are welded, the protective personnel use warning tape to isolate the thermite welding area to ensure that the thermite welding construction is not disturbed and the construction progress and quality are guaranteed. At the same time, when the turnout and the line are welded, rain protection measures should be taken.

[0012] S11. Final adjustment of the line: After qualified welding, the direction and elevation of the line are adjusted by a track laying machine until the design requirements are met, and the laying operation is completed.

[0013] It should be noted that the following preparations should be made before the insertion construction: 1. Investigate the positions of the welding joints and insulating joints of the existing rail site after the insertion of the turnout head in advance, and complete the track matching and preparation in advance. At the same time, investigate the sections that need to be evenly matched and replaced, and prepare the sleepers in advance. 2. Pre-measure the rail surface elevations corresponding to the turnout head, turnout core, and turnout tail of the existing line insertion section to control the elevation after the new turnout is inserted, and do a good job of connecting the newly laid connecting line. 3. Set the 5m point of the turnout and the position of the turnout head and turnout tail. Use a total station to lay out the 5m point of the turnout to the non-working side of the insertion section track and the adjacent track rails, and mark the point number and position on the waist of the adjacent track rails. 4. Set various control piles for adjustment after the turnout is longitudinally moved into place, and pay attention to checking the limits of existing equipment such as signal machines and contact networks. 5. Determine the interference range of the turnout construction.

[0014] The purpose of this scheme is to realize the insertion and laying construction of various types of turnouts in a small space, including the common No. 18 and No. 42 turnouts, etc. Among them, the No. 42 turnout is a large turnout with a straight strand length of more than 150 meters. If it is done in the existing way, an additional assembly section needs to be built at the insertion position. If there are multiple insertion points on an existing ballasted line, the operation efficiency is low and the insertion cost is high according to the existing method. Therefore, this scheme considers that if there are multiple insertion points or the insertion conditions of the insertion points are poor (the construction site is narrow, the working surface is compact, or there is serious interference from existing equipment, etc.), the turnout can be transferred to the insertion point by the turnout moving track, where the turnout moving track can be connected to the point with insertion conditions to establish an assembly section, or it can be directly transferred to the turnout moving track by road. Therefore, this scheme uses the existing rail tractor to build a turnout moving track to realize the construction of inserting large-number turnouts into existing ballasted lines in a small space. For the construction of turnout moving tracks next to existing ballasted lines, the path layout of the turnout moving track is very important. The most ideal state is to arrange it parallel to the existing ballasted line, so that the turnout can be directly moved longitudinally and then laterally, and the moving distance can be controlled, and the distance adjustment is relatively small. However, the actual working situation is that the turnout moving track to be built is not parallel to the existing ballasted line. Therefore, this scheme arranges the turnout moving track by determining the optimal turnout moving track path.

[0015] The determination of the optimal turnout moving track path comprises the following steps: a. According to the position of the insertion position, the turnout parking area after the turnout is longitudinally moved into place is marked, and the turnout moving track line is planned from the turnout moving direction, wherein the turnout moving track line is divided into an inner line S1 located in the turnout parking area and an outer line S2 located outside the turnout parking area; b. Simulate the turnout movement into position: simulate the existing ballasted track, the ballasted track to be connected, the turnout parking area, the turnout movement track route and the turnout moved into position, where the lateral movement distance from the turnout head to the existing ballasted track is A1, and the lateral movement distance from the turnout tail of the turnout straight line to the existing ballasted track is A2, A2 ≥ A1; c. Determine the optimal turnout moving track path: If the deviation between A1 and A2 does not exceed 50mm, retain the existing inner line S1, and the optimal turnout moving track path is the inner line S1 and the outer line S2. If the deviation between A1 and A2 is greater than 50mm, adjust the inner line S1 until A1 and A2 are equal. The adjusted inner line is the inner line S3. After determining the inner line S3, adjust the outer line S2 to connect with the inner line S3. The adjusted outer line is the outer line S4. At this time, the optimal turnout moving track path is the inner line S3 and the outer line S4.

[0016] It can be seen that this scheme first simulates the inner line S1 and the outer line S2. Since the large-numbered turnout (No. 42 turnout) is larger in size, if the curvature radius of the turnout moving track is too small, the turnout is heavy and inconvenient to transport. The curvature radius of the turnout moving track is not less than 2500m. The inner line S1 and the outer line S2 are determined through field surveys. The inner line S1 and the outer line S2 are connected in sequence. As a preferred method, the inner line S1 and the outer line S2 should be inserted into the turnout parking area as a straight line or a curve with a curvature radius greater than 2500m as much as possible. By controlling the deviation of A1 and A2 in the simulation software, the lateral displacement distance between the turnout and the existing ballasted track after entering the turnout parking area is controlled. Since the inner line S1 and the outer line S2 are paths drawn from measured points, except for the ideal state (the turnout moving track is parallel to the existing ballasted track), the deviation of A1 and A2 is not large, and the remaining deviations of A1 and A2 are large. Therefore, this solution corrects the inner line S1 and the outer line S2, so that the position adjustment amount of the turnout entering the turnout parking area is controlled in the optimal way. It should be noted that the outer line S2 includes one or a combination of a straight track and a curved track. When the outer line S2 is connected to the inner line S1, it is sufficient to ensure that the radius of curvature is greater than 2500m. The positions of the remaining outer lines S2 can be determined according to actual conditions, such as tunnels, transfers, etc., determined on site.

[0017] The moving into position refers to the movement of the turnout to align with the turnout connection point of the existing ballasted track.

[0018] The fine-tuning device is composed of a plurality of evenly distributed universal wheel assemblies. The universal wheel assembly includes a lower pad and an upper pad. The lower pad is provided with a base. The base is provided with a plurality of mounting grooves surrounding the center of the base. The number of the mounting grooves is not less than 3. A rotating sphere is movably installed in each mounting groove. The rotating spheres have the same elevation. The rotating spheres protrude from the base. Each mounting groove is provided with a plurality of limit blocks for limiting the rotating spheres. When the turnout posture is adjusted, the lower surface of the upper pad is in close contact with all the rotating spheres on the base. The turnout is placed on the upper surface of the upper pad. By turning the turnout, the upper pad drives the rotating sphere to rotate to achieve a small range of turnout position adjustment. Since the large-sized horse turnout is relatively long, it is generally carried out in a segmented manner.

[0019] This solution can control the maximum lateral movement distance by determining the optimal turnout moving track path. The optimized moving route can effectively control the number of adjustments and the amount of movement. On the other hand, the turnout moving track can be used to solve the long-distance movement problem between the insertion point and the assembled turnout. After the turnout is moved into place, the turnout is moved to the insertion point through the lateral movement device, which can achieve a large range of lateral movement distance adjustment after moving into place, and then a small range of position adjustment can be made through the fine adjustment device. After welding is completed, the final precision adjustment is performed until the design requirements are met.

[0020] The beneficial effects of the present invention are as follows: simulation optimization of the turnout moving track is carried out, the turnout is moved as a whole, and the posture is adjusted through a lateral movement device and a fine adjustment device, which breaks through the limitations of existing insertion conditions, improves the turnout operation efficiency within the operating line range of the existing ballasted line, and realizes the construction of inserting large-number turnouts into the existing ballasted line in a small space. It is particularly suitable for the construction of inserting large-number turnouts into the existing line by long-distance longitudinal movement as a whole when the site is limited and the working surface is compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a construction flow chart of the present invention; Figure 2 It is a schematic diagram of the arrangement of the tractor and the lifting cylinder group of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the middle area A; Figure 4 A schematic diagram of the optimal turnout moving track path of the present invention; Figure 5 A comparative schematic diagram of the optimal turnout moving track path of the present invention; Figure 6 It is a structural schematic diagram of the fine adjustment device of the present invention; Figure 7It is a schematic diagram of the installation position of the rotating sphere in the fine adjustment device of the present invention; Figure 8 It is a schematic diagram of the structure of the limit block in the fine adjustment device of the present invention.

[0022] In the figure, 1-lower pad, 2-upper pad, 3-base, 4-mounting slot, 5-rotating sphere, 6-limiting block. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and 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.

[0024] like Figure 1 As shown, a turnout laying construction method for an existing ballasted track comprises the following steps: S1. Determine the track path for the turnout movement: determine the best track path for the turnout movement according to the insertion position and the turnout movement direction, and the turnout is turnout No. 42; S2. Preparation before construction: Use the skylight point before laying to complete the hard isolation installation and point marking at the laying location, and lay the running rail according to the optimal turnout moving track path; S3. Removal of existing ballasted track tracks: sawing the existing ballasted track tracks according to the insertion positions within the skylight points, removing the rails and sleepers sawed off in the section where the insertion positions are located, and inspecting the trackbed; S4. Moving turnouts: Using the laid track, the assembled turnouts are moved to the insertion position by a tractor. Specifically, 21 longitudinal moving trolleys (9 driving and 12 driven) are used to longitudinally move the turnouts 200m to the insertion position. The turnouts are adjusted during the operation, and the warning signs are installed at the same time.

[0025] S5. Lifting turnout: After the turnout is moved into position, it is lifted by the lifting cylinder group installed on the tractor, and then a safety stack is set up under the turnout, and the tractor and the running rails under the turnout are moved out; short wooden sleepers are placed under the cylinders, and the turnout is lifted 600mm by 48 lifting cylinders, and a safety stack is set up, 21 longitudinal moving trolleys are pulled out, and a 50 loader is used to pull out two 156-meter running rails from behind the turnout, and then the wooden sleepers are pulled out.

[0026] S6, drop the turnout: arrange a transverse moving device and a movable lifting cylinder group under the turnout, lift the turnout by the movable lifting cylinder group, move it out of the safety pile, drop the turnout on the transverse moving device, and take out the movable lifting cylinder group; S7, turnout attitude adjustment: Use the lateral movement device to adjust the turnout in the general direction until the lateral movement distance of the turnout is less than 2cm, arrange the movable lifting cylinder group under the turnout, lift the turnout by the movable lifting cylinder group, move out of the lateral movement device, and then install the fine adjustment device under the turnout (48 fine adjustment devices are evenly arranged), put the turnout on the fine adjustment device, take out the movable lifting cylinder group, and adjust the turnout by the fine adjustment device until the lateral movement distance is less than 5mm, completing the turnout attitude adjustment; S8, turnout line entry: install a movable lifting cylinder group under the turnout, lift the turnout through the movable lifting cylinder group, remove the fine adjustment device, and then cooperate with the movable lifting cylinder to control the track surface elevation of the turnout, connect the joints with splints, and the turnout line entry is completed; the track surface elevation control in step S8 means that the track surface elevation of the turnout is based on the existing ballasted track track surface elevation, with a reserved 20mm control, and the slope is 1‰ from the turnout head and turnout tail to the turnout, and the curve side is controlled by 0.5mm lower than the straight line. In step S8, a 5-8mm weld is left at the joint.

[0027] S9, backfilling ballast: after the turnout is put into line, the ballast is backfilled at the insertion position and tamped and maintained, and welding seams are reserved. During the backfilling process, the movable lifting cylinder is moved out; in step S9, the ballast is first backfilled at the movable lifting cylinder point below the turnout. During the backfilling process, the ballast is backfilled in sections, and the turnout is adjusted for elevation and orientation during the sectioned backfilling.

[0028] S10, turnout welding: after the tamping maintenance meets the standards, the turnout is welded to the existing ballasted track and the ballasted track to be connected respectively; in step S10, the turnout is welded to the existing ballasted track first, and the turnout is welded to the ballasted track to be connected the next day.

[0029] S11. Final adjustment of the line: After qualified welding, the direction and elevation of the line are adjusted by a track laying machine until the design requirements are met, and the laying operation is completed.

[0030] Among them, the tractor adopts CPH-240T hydraulic turnout laying and changing unit, which has the function of moving and positioning the whole group of large-number and heavy turnouts. Its characteristics are reasonable structural design, split structure, light weight, easy movement, flexible operation, and stable hydraulic pressure. The hydraulic pump station uses a well-known brand engine as the power, with low failure rate and long service life. The hose has a quick-change connector for rapid connection. It is suitable for field operations. It is a substitute for traditional track-lifting equipment. It has advanced technical performance and can meet the requirements of various types of turnout replacement. Compared with the insertion of No. 42 turnout into the existing line under complex working conditions, it only needs to modify its YZZX-60 hydraulic longitudinal moving tractor to meet the needs. The improved hydraulic longitudinal moving tractor has the following notable features: reasonable structural design, simple and flexible operation, clutch structure, forward, backward and manual pushing functions, and lateral adjustment function. During operation, the turnout rails can be automatically pulled and pushed longitudinally without manual pushing. It uses high-quality hydraulic motors as power, with low failure rate, large traction, reliable performance, and easy use and maintenance. The top tray of the longitudinal traction vehicle is improved to a tray that can be adjusted 300mm laterally, which is easy to adjust laterally, reduces construction labor, and improves operating efficiency. The hydraulic system is safe and reliable, and the machine is equipped with a skid steering function. It will not fall off the track or derail, and can smoothly pass through the small radius curve area of ​​the turnout. It is easy to install, quick and easy to get off the track, and will not invade the "limit" after getting off the track, ensuring driving safety. It is an ideal machine necessary for mechanized maintenance and repair of railway lines.

[0031] In order to ensure the safety and stability of the overall longitudinal movement of the turnout, the lifting force of the lifting device of the turnout re-laying unit and the bearing capacity of the longitudinal movement tractor were studied, and a reasonable distribution was made according to the length and section weight of the turnout No. 42. The main performance of the tractor in this scheme is as follows: the lifting force of the lifting device is 200KN (20T); single longitudinal movement tractor: bearing capacity ≮200kN (20T), maximum traction ≮60kN (6T).

[0032] In this embodiment, Figure 2-Figure 3 As shown, the lifting device cylinders are arranged symmetrically according to the turnout structure, with a total of 24 pairs. The lifting force of each pair of cylinders is about 8-14T, and the lifting force of a single cylinder of the lifting device is 200KN (20T), which meets the lifting requirements of the turnout and ensures the safety and stability of the overall rise and fall of the turnout. Point P is the center position of the trolley, and point T is the cylinder installation point.

[0033] The turnout longitudinal shift tractors are arranged in 21 units, including 9 power tractors and 12 driven tractors. The rated load-bearing capacity of a single longitudinal shift tractor is 20T. The tractors are arranged at intervals of 7-9 sleepers, and the load-bearing capacity is arranged at 10-13T per unit to meet the load-bearing requirements of the trolley (the total weight of the turnout is 262T including the weight of the switch machine). In this embodiment, the weight of the turnout is 262T, the traction force of each power longitudinal shift tractor is 60KN, and the forward rolling friction force = positive pressure * rolling friction coefficient (calculated according to the rolling friction coefficient of the wheel and rail 0.1), and the rolling friction force F = utg = 0.1 * 262 * 9.8Kg / N = 257KN. It is calculated that 5 power longitudinal shift tractors can meet the construction needs, and the configuration is based on the investment of 9 power tractors during construction. The longitudinal shift length of the turnout is 420 meters. According to the test results, equipped with 5 power tractors, the longitudinal shift speed of the turnout can reach 10m / min, and the construction efficiency is high.

[0034] Among them, the transverse shifting device assembly is composed of a roller bracket, 7 sets of rollers and a pad, with dimensions (2000 mm long, 255 mm wide and 230 mm high). The roller bracket is made of a 120*120*4 square tube as a crossbeam, a 60*60*4 square tube as a longitudinal beam and a 255*80*6 channel steel as a roller bracket. The roller assembly is composed of a 95*10 diameter seamless tube, 2 plates of 307 bearings and a 40 diameter round steel. The pad is made of a 2000*255*12 steel plate as a slide plate. The static load-bearing mass of a single set of roller assemblies is ≤7 tons, the dynamic load-bearing mass is ≤4 tons, and the static load-bearing mass of a single set of roller brackets is ≤45 tons. The specific structure refers to the patent number "202323564353.8, and the patent name is "A transverse shifting device for inserting and laying turnouts on existing lines".

[0035] The determination of the optimal turnout moving track path comprises the following steps: a. According to the position of the insertion position, the turnout parking area after the turnout is longitudinally moved into place is marked, and the turnout moving track line is planned from the turnout moving direction, wherein the turnout moving track line is divided into an inner line S1 located in the turnout parking area and an outer line S2 located outside the turnout parking area; b. Simulate the turnout movement into position: simulate the existing ballasted track, the ballasted track to be connected, the turnout parking area, the turnout movement track route and the turnout moved into position, where the lateral movement distance from the turnout head to the existing ballasted track is A1, and the lateral movement distance from the turnout tail of the turnout straight line to the existing ballasted track is A2, A2 ≥ A1; c. Determine the optimal turnout moving track path: If the deviation between A1 and A2 does not exceed 50mm, retain the existing inner line S1, and the optimal turnout moving track path is the inner line S1 and the outer line S2. If the deviation between A1 and A2 is greater than 50mm, adjust the inner line S1 until A1 and A2 are equal. The adjusted inner line is the inner line S3. After determining the inner line S3, adjust the outer line S2 to connect with the inner line S3. The adjusted outer line is the outer line S4. At this time, the optimal turnout moving track path is the inner line S3 and the outer line S4.

[0036] like Figure 4 As shown, the intersection of the turnout moving track route and the turnout parking area is M0, then the end face of the straight branch fork head of the turnout is used as the reference plane, and the center of the reference plane is selected as the reference point to rotate until A1 and A2 are equal. A circle is drawn with the reference point as the passing point and the internal line curvature radius R, R ≥ 2500m, and the intersection M1 with the turnout parking area is obtained (adjusted from M0 to M1). At this time, the turnout moving track path is optimized, and the red color indicates the turnout and line after rotation. In this embodiment, Figure 5 As shown in the figure, due to the limitation of the construction site, the interference of existing equipment (signal machine, contact network, hard crossover, existing turnout switch machine, transformer box, etc.) is serious. When the turnout is assembled, the turnout center cannot coincide with the center of the connecting line, and the deviation value reaches 0.9m. The turnout will cause eccentric load during assembly. The design line is in an eccentric state, and the straight basic rail of the turnout is in a straight state. When the turnout is moved longitudinally as a whole in the later stage, the longitudinal shifting trolley can be placed on the connecting line after eccentric laying, and the center of the turnout sleeper is coincident with the center of the longitudinal shifting trolley to achieve the condition of overall longitudinal movement of the turnout. The center coordinates of the line after eccentric laying are collected and imported into CAD drawing software to simulate the shape of the turnout when it is located above the connecting line as a whole, determine the center line of the turnout straight strand, and perform on-site layout and marking according to the 5m point of the straight strand. The adjustment amount of the distance of the cross beam at the end of the turnout after correction is significantly reduced. Among them, the red line is the upward connecting line, the blue line is the simulated line, and the green line is the adjusted line.

[0037] The moving into position refers to the movement of the turnout to align with the turnout connection point of the existing ballasted track.

[0038] like Figure 6-Figure 8As shown, the fine-tuning device is composed of a plurality of uniformly distributed universal wheel assemblies. The universal wheel assembly includes a lower pad 1 and an upper pad 2. The lower pad 1 is provided with a base 3. The base 3 is provided with a plurality of mounting grooves 4 surrounding the center of the base 3. The number of the mounting grooves 4 is not less than 3. A rotating sphere 5 is movably installed in each of the mounting grooves 4. The rotating spheres 5 have the same elevation. The rotating spheres 5 protrude from the base 3. Each of the mounting grooves 4 is provided with a plurality of limit blocks 6 for limiting the rotating spheres 5. The inner side of the limit blocks 6 is an arc surface. When the turnout posture is adjusted, the lower surface of the upper pad 2 is in close contact with all the rotating spheres 5 on the base 3, and the turnout is placed on the upper surface of the upper pad 2. Among them, the rotating sphere 5 is an iron ball with a diameter of 80 mm; the base 3 is a triangular iron plate with a side length of 346.41 mm; the lower pad 1 and the upper pad 2 have the same size, 400 mm*400 mm*10 mm.

[0039] This solution can complete the dismantling of the existing line, the insertion of seamless turnouts, manual track maintenance, welding, and fine-tuning within 460 minutes at a skylight point, and the speed limit is set to start operation after the point is completed, which greatly improves the efficiency of inserting large-number turnouts in a narrow space. In addition, the simulation optimization of the turnout moving track was carried out, and the turnout was moved as a whole, and the posture was adjusted through the transverse movement device and the fine-tuning device, breaking through the limitations of the existing insertion conditions, improving the turnout assembly accuracy and efficiency, and overall transportation safety, so that the No. 42 turnout can be inserted accurately at one time, reducing the investment in construction and maintenance, saving manpower, material resources, time, and reducing costs by 3.48 million yuan; at the same time, the use of additional soft and hard isolation measures has reduced the impact of construction blockades on railway transportation, added value to railway transportation, and avoided the suspension of multiple trains. The economic benefits are significant, while reducing the scope of construction impact and reducing interference with operating line transportation. The application of this solution has positive significance for saving engineering costs and improving the level of safety production management of operating lines, and has strongly promoted the development of mechanized construction technology for inserting large turnouts into existing lines.

[0040] 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 turnout laying construction method for an existing ballasted track, characterized in that: The following steps are involved: S1. Determine the track path for turnout movement: determine the optimal track path for turnout movement according to the insertion position and the turnout movement direction; S2. Preparation before construction: Use the skylight point before laying to complete the hard isolation installation and point marking at the laying location, and lay the running rail according to the optimal turnout moving track path; S3. Removal of existing ballasted track tracks: sawing the existing ballasted track tracks according to the insertion positions within the skylight points, removing the rails and sleepers sawed off in the section where the insertion positions are located, and inspecting the trackbed; S4, moving turnout: using the laid track, the assembled turnout is moved to the insertion position by a tractor; S5, Lifting the turnout: After the turnout is moved into position, the turnout is lifted by the lifting cylinder group installed on the tractor, and then a safety pile is set up under the turnout to remove the tractor and the running rails under the turnout; S6, drop the turnout: arrange a transverse moving device and a movable lifting cylinder group under the turnout, lift the turnout by the movable lifting cylinder group, move it out of the safety pile, drop the turnout on the transverse moving device, and take out the movable lifting cylinder group; S7, turnout attitude adjustment: Use the lateral movement device to adjust the turnout in the general direction until the lateral movement distance of the turnout is less than 2cm, arrange the movable lifting cylinder group under the turnout, lift the turnout by the movable lifting cylinder group, move it out of the lateral movement device, and then install the fine adjustment device under the turnout, drop the turnout on the fine adjustment device, take out the movable lifting cylinder group, and adjust the turnout by the fine adjustment device until the lateral movement distance is less than 5mm, completing the turnout attitude adjustment; S8, turnout line entry: install a movable lifting cylinder group under the turnout, lift the turnout through the movable lifting cylinder group, move out of the fine adjustment device, and then cooperate with the movable lifting cylinder to control the rail surface elevation of the turnout, connect the joints with splints, and the turnout line entry is completed; S9, backfill ballast: After the turnout is put into line, backfill the ballast at the insertion position and tamp and maintain it, reserve the welding seam, and remove the movable lifting cylinder during the backfilling process; S10, turnout welding: after the tamping maintenance meets the standards, welding operations are carried out on the turnout and the existing ballasted track and the ballasted track to be connected; S11. Final adjustment of the line: After qualified welding, the direction and elevation of the line are adjusted by a track laying machine until the design requirements are met, and the laying operation is completed.

2. The turnout laying construction method for an existing ballasted track according to claim 1 is characterized in that: The determination of the optimal turnout moving track path comprises the following steps: a. According to the position of the insertion position, the turnout parking area after the turnout is longitudinally moved into place is marked, and the turnout moving track line is planned from the turnout moving direction, wherein the turnout moving track line is divided into an inner line S1 located in the turnout parking area and an outer line S2 located outside the turnout parking area; b. Simulate the turnout movement into position: simulate the existing ballasted track, the ballasted track to be connected, the turnout parking area, the turnout movement track route and the turnout moved into position, where the lateral movement distance from the turnout head to the existing ballasted track is A1, and the lateral movement distance from the turnout tail of the turnout straight line to the existing ballasted track is A2, A2 ≥ A1; c. Determine the optimal turnout moving track path: If the deviation between A1 and A2 does not exceed 50mm, retain the existing inner line S1, and the optimal turnout moving track path is the inner line S1 and the outer line S2. If the deviation between A1 and A2 is greater than 50mm, adjust the inner line S1 until A1 and A2 are equal. The adjusted inner line is the inner line S3. After determining the inner line S3, adjust the outer line S2 to connect with the inner line S3. The adjusted outer line is the outer line S4. At this time, the optimal turnout moving track path is the inner line S3 and the outer line S4.

3. A turnout laying construction method for an existing ballasted track according to claim 2, characterized in that: The outer line S2 includes a straight track, a curved track, or a combination thereof.

4. A turnout laying construction method for an existing ballasted track according to claim 2, characterized in that: The moving into position refers to the movement of the turnout to align with the turnout connection point of the existing ballasted track.

5. The method for inserting and laying turnouts on an existing ballasted track according to claim 1, characterized in that: The fine adjustment device is composed of a plurality of evenly distributed universal wheel assemblies.

6. A turnout laying construction method for an existing ballasted track according to claim 5, characterized in that: The universal wheel assembly comprises a lower pad (1) and an upper pad (2), the lower pad (1) being provided with a base (3), the base (3) being provided with a plurality of mounting grooves (4) surrounding the center of the base (3), the number of the mounting grooves (4) being not less than 3, a rotating sphere (5) being movably mounted in each of the mounting grooves (4), the rotating spheres (5) having the same elevation, the rotating spheres (5) protruding from the base (3), and a plurality of limit blocks (6) for limiting the rotating spheres (5) being provided on each of the mounting grooves (4), when the turnout posture is adjusted, the lower surface of the upper pad (2) is in close contact with all the rotating spheres (5) on the base (3), and the turnout is placed on the upper surface of the upper pad (2).

7. The method for inserting and laying turnouts on an existing ballasted track according to claim 1, characterized in that: The track surface elevation control in step S8 means that the track surface elevation of the turnout is controlled by reserving 20mm based on the track surface elevation of the existing ballasted line, and a slope of 1‰ is made from the turnout head and turnout tail to the turnout, and the curve side is controlled to be 0.5mm lower than the straight line.

8. The method for inserting and laying turnouts on an existing ballasted track according to claim 1, characterized in that: In step S9, the movable lifting cylinder point below the turnout is backfilled with ballast first. The backfilling process is carried out in sections, and the turnout is adjusted for elevation and orientation during the section backfilling.

9. The method for inserting and laying turnouts on an existing ballasted track according to claim 1, characterized in that: In step S10, the turnout is first welded to the existing ballasted track, and the turnout is then welded to the ballasted track to be connected the next day.

10. A turnout laying construction method for an existing ballasted track according to any one of claims 1 or 7, characterized in that: In step S8, a 5-8 mm weld is left at the joint.

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