A catenary cantilever fine pre-disposition method and device

Abstract

The application belongs to the technical field of rail transit, and particularly relates to a catenary arm fine pre-arrangement method and device, wherein the catenary arm fine pre-arrangement device comprises a sleeve plate and a fixing mechanism; the middle of the sleeve plate is sleeved on the upper end of a stand column, and each side of the sleeve plate is connected with the fixing mechanism; the fixing mechanism comprises a connecting plate, a fixing ring and a lock rod; one end of the connecting plate is fixedly hung on the sleeve plate, and the other end of the connecting plate is fixedly connected to the fixing ring; the fixing ring is in the shape of a ring body with a notch, the notch angle is 110-120 DEG, one end of the fixing ring is provided with a driving unit, and the other end of the fixing ring is provided with a fixing hole; the driving unit comprises a motor, a gear and a rack; the motor is fixedly connected to the fixing ring, the motor output end gear is in meshing transmission with the rack, the rack is in the shape of an arc, the rack is fixedly connected to the outer circle of the arc-shaped lock rod, one end of the lock rod is slidably connected into the telescopic cavity formed in one end of the fixing ring, the other end of the lock rod is embedded into the fixing hole, and the lock rod is slidably connected into the telescopic cavity.

Description

Technical Field

[0001] This invention belongs to the field of rail transit technology, specifically a method and device for precise pre-assembly of overhead contact line cantilever arms. Background Technology

[0002] The relatively low efficiency, high risk, and high loss inherent in the construction industry still exist to varying degrees in all aspects of electrified railway catenary construction. Over the past decade, innovative practices in high-speed railway catenary construction have solved key technological problems in system design and construction, and completed the development of major related equipment. One of its major achievements is the integrated design and construction method for high-speed railway catenary projects, which includes four specific construction methods: cantilever pre-assembly, dropper pre-assembly, constant tension stringing, and elastic sling installation. These methods, coupled with standard catenary work vehicles and stringing vehicle sets, have significantly elevated the overall construction technology level of traditional 20th-century Chinese catenary engineering through comprehensive promotion and application.

[0003] However, the implementation of these key processes requires high comprehensive skills from frontline workers, and many operational steps, such as cantilever assembly, hoisting, and installation, have not yet been mechanized. Overhead contact line workers still need to work at heights with heavy loads, and manual labor remains arduous, inefficient, and poses certain safety hazards.

[0004] Therefore, the present invention provides a method and apparatus for precise pre-assembly of overhead contact line arms. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a method for fine pre-assembly of catenary arms, the pre-assembly method including a construction surveying process and a support assembly process; the construction surveying process includes determining the starting point, longitudinal measurement, transverse measurement, marking and recording.

[0007] The determination of the starting point includes the starting point specified in the design, the starting point at the end of the bridge, the starting point at the tunnel entrance, and the turnout core pile on the outermost side of the station. The starting point specified in the design is a permanent mileage point set on-site and provided in writing by the track construction unit.

[0008] The longitudinal measurement is carried out according to the span indicated on the drawings. The measurement is carried out along the rail using a steel ruler. In the curved section, the measurement should be carried out along the rail outside the curve. During the measurement process, attention should be paid to checking the mileage with the kilometer markers and other buildings on site and making timely adjustments. In the curved section, the error should be evenly distributed in the curved section. After the longitudinal measurement of each anchor section, the length of the entire anchor section should be checked to see if it matches the drawings.

[0009] The lateral measurement is consistent with the position determined by the longitudinal measurement for single-track sections. For multi-track sections, the isosceles triangle rule is used for positioning. Based on the position determined by the longitudinal measurement point, two points are determined 5 meters to each side of the main track and important tracks. The third point of the triangle is then transferred to the adjacent rail using the isosceles triangle principle. The two points are used to determine a straight line and the rails of each track are marked.

[0010] The markings are as follows: when measuring laterally, the foundation position is marked on the side of the top of each track with paint. On the track side close to the foundation position, a vertical line is marked on the web of the rail with red paint to indicate the position of the support or guy wire and to indicate the support number.

[0011] The aforementioned record-keeping involves making accurate measurement records based on the measurement findings, filling out negotiation forms based on any changes made on-site, and promptly completing the change procedures.

[0012] Preferably, the column assembly process includes construction preparation, calculation and pre-assembly, column installation and record filling in sequence;

[0013] During the construction preparation, the installation height of the base should strictly follow the design requirements, and be measured upwards with the center height of the rail surface connection line as the reference point.

[0014] The calculation pre-fitting involves measuring the support parameters based on the required parameters for the wrist arm, and simultaneously calculating the following parameters based on the wrist arm: the length of the horizontal and inclined wrist arms; the length of the positioning tube; the distance between the positioning ring and the end of the inclined wrist arm; the distance between the positioning double ring and the fixed end of the positioning tube; and the length and installation position of the wrist arm support tube and the positioning support tube. Then, the above parameters are compiled into a wrist arm pre-fitting data table corresponding to the support numbers. The reference data provided in the wrist arm pre-fitting data table is marked on the wrist arm to be cut.

[0015] The support column is installed as follows:

[0016] S1: The cantilever arm is pre-assembled in the assembly workshop and then transported to the installation site. At the same time, the support column is transported to the site and unloaded on the ground. Two square timbers need to be placed on the ground as pads to ensure that there is space between the support column and the gap, so that there is room when installing materials on site.

[0017] S2: Support assembly. According to the construction log, the pre-assembled cantilever materials are installed on the support as required. Ground workers use ropes to lift the pre-assembled cantilever to the height of the lower cantilever base.

[0018] S3: The entire support column is hoisted. Before hoisting, the on-site quality inspector must check the construction log to see if the wrong materials are used, whether the installation height is appropriate, and whether the tightening torque is in place. After confirming that everything is correct, the support column is hoisted in conjunction with a crane using hoisting equipment.

[0019] The implementation is based on a trackless measurement platform. This platform uses CP-III precision measurement network data to perform laser three-point positioning of the center point, so as to achieve the purpose of accurate positioning of the contact network. Since high-speed railways require good stability, continuity and high smoothness, high-precision three-dimensional control measurement technology is required during construction. The application of CP-III technology meets the requirements and needs of high-speed railway construction, operation and maintenance.

[0020] Because of the precise location of the CP-III precision survey network, this measurement platform uses laser three-point positioning technology to select any three points in the CP-III precision survey network as fixed coordinate points, and uses three CP-III stakes to accurately locate the position of the trackless measurement platform.

[0021] Since the location of any stake in the CP-III precision measurement network is accurate and any selected benchmark is independent, the measurement tool designed in this paper has independent measurement points. When an error is found in the measurement of a certain point, there is no need to remeasure other points, which greatly improves the measurement efficiency.

[0022] Preferably, before installing the support column, adjusting nuts for the foundation are pre-installed. The contact wire supports are all fixed using flanges. The fixing method involves one adjusting nut under the support flange, two fixing nuts on the support flange, and one nut at the bottom for adjusting the column's slope. The contact wire is always tilted in the opposite direction of the applied force. The relationship between the height difference of the adjusting nuts under the support flange and the slope is pre-calculated, as shown in Formula A.

[0023] Formula A:

[0024] The amount of nut lift on the load-bearing side of the support column is calculated using the following formula:

[0025] a = e × m / L

[0026] a - The amount of nut lift on the load-bearing side of the support (mm);

[0027] e – Inclination value at the top of the support column (mm);

[0028] L – Column height (mm);

[0029] m — Width of the base of the support column (mm).

[0030] A precision pre-assembly device for overhead contact line cantilever arms, applicable to any of the aforementioned precision pre-assembly methods for overhead contact line cantilever arms, wherein the pre-assembly device is the hoisting device described in S3; the hoisting device includes a sleeve plate and a fixing mechanism; the sleeve plate is fitted onto the upper end of a column in the middle, and a fixing mechanism is connected to each side of the sleeve plate; the fixing mechanism includes a connecting plate, a fixing ring, and a locking rod; one end of the connecting plate is fixedly hung on the sleeve plate, and the other end of the connecting plate is fixedly connected to the fixing ring, the fixing ring being a ring with a notch, the notch angle being 110-120°, one end of the fixing ring having a drive unit, and the other end of the fixing ring having a fixing hole; the drive unit includes a motor, a gear, and a rack; the motor is fixedly connected to the fixing ring, the output end of the motor gear meshes with the rack, the rack being arc-shaped, the rack being fixedly connected to the outer ring of the arc-shaped locking rod, one end of the locking rod being slidably connected to a telescopic cavity opened inside one end of the fixing ring, and the other end of the locking rod being embedded in the fixing hole, the locking rod being slidably connected Inside the telescopic cavity; the sleeve plate is fitted onto the upper end of the column, with the connecting plate close to the outer ring of the column and the fixing ring also close to the column. The fixing ring is fitted at the point where the cross arm is fixed to the column. The drive motor drives the gear through the rack to extend the locking rod from the telescopic cavity, with the other end of the locking rod embedded in the fixing hole. At this time, the fixing ring and the locking rod form a complete circle, wrapping around the cross arm. The hoisting rope is tied to the binding ring on the sleeve plate, and the column is lifted up. Then, the lower end of the column is stabilized on the ground, and the hoisting rope is lowered until it is slack. The drive motor is then reversed, and the gear rotates the rack, causing the locking rod to gradually retract into the telescopic cavity. At this time, the fixing ring is opened, and the hoisting rope is continued to be lifted. The hoisting rope lifts the sleeve plate away from the upper end of the column. At this time, the hoisting device is detached from the column, realizing the automatic detachment of the hoisting rope from the column. It is not necessary for personnel to climb to the top of the column to untie the hoisting rope, reducing the probability of accidents during high-altitude operations and facilitating the orderly operation of on-site personnel.

[0031] Preferably, an anti-detachment mechanism is provided at the bottom of the fixing hole; the anti-detachment mechanism includes a force-bearing bladder, a compression bladder, and an anti-detachment pin; the force-bearing bladder is bonded to the bottom surface of the fixing hole, the force-bearing bladder is connected to the compression bladder, the compression bladder is located in a cavity opened on one side of the fixing hole, a sliding hole is opened between the cavity and the fixing hole, one end of the anti-detachment pin is connected to the inner wall of the cavity by a spring and is pressed against the compression bladder, the other end of the anti-detachment pin is fixed through the sliding hole and embedded in the anti-detachment hole opened at the other end of the locking rod; the locking rod is pressed against the force-bearing bladder, the gas in the force-bearing bladder is blown into the compression bladder, the compression bladder expands and presses against the anti-detachment pin, the anti-detachment pin is embedded in the anti-detachment hole, fixing the locking rod in the fixing hole, further improving the stability of the locking rod, thereby improving the stability of the complete circle formed by the fixing ring and the locking rod, and ensuring the safety of the hoisting operation.

[0032] Preferably, the inner ring of the locking rod has a guide groove, which runs along the inner ring of the locking rod. Push rods are symmetrically arranged within the guide groove, with one end of each push rod having an inclined surface and a ball bearing on the inclined surface. An L-shaped insert rod is fixed to the other end of one of the push rods. The end of the insert rod slides through the anti-detachment hole via a spring and is embedded in the insertion hole on the outer ring of the anti-detachment pin. The cross arm presses against the inclined surface at one end of the push rod, and one push rod moves towards the other end of the locking rod. Simultaneously, one push rod pushes the insert rod, and the end of the insert rod is embedded in the insertion hole, further fixing the anti-detachment pin and the anti-detachment hole. This further improves the stability of the locking rod, and consequently, further improves the stability of the complete ring formed by the fixing ring and the locking rod, ensuring the safety of the hoisting operation.

[0033] Preferably, one end of the locking rod has an arc-shaped groove, and an arc-shaped rod is provided in the arc-shaped groove; an arc-shaped hole is provided in the telescopic cavity near the gear, and one end of the arc-shaped rod is attracted to the other end face of another push rod by a magnet, and the other end of the arc-shaped rod is embedded in the arc-shaped hole; the cross arm presses against the inclined surface of one end of the push rod, and the other end of the other push rod presses against the arc-shaped rod, the arc-shaped rod moves along the arc-shaped groove, and the arc-shaped rod is embedded in the arc-shaped hole. At this time, one end of the locking rod is further fixed in the telescopic cavity, which further improves the stability between the locking rod and the telescopic cavity.

[0034] Preferably, a groove is formed on one side of the arc-shaped hole, and a thrust rod is provided in the groove. One side of the groove is connected to the arc-shaped hole, and the other side of the groove extends into the telescopic cavity. One end of the thrust rod is placed at the bottom of the arc-shaped hole, and the other end of the thrust rod is bent towards the push rod and embedded in a thrust hole on the push rod. The bent part of the thrust rod is rotatably connected to the groove by a torsion spring. The end of the arc-shaped rod presses against one end of the main push rod, and the other end of the thrust rod is embedded in the thrust hole, so that the thrust rod, the arc-shaped rod, and the push rod form a closed locking ring structure, which further improves the stability between the locking rod and the telescopic cavity.

[0035] Preferably, the inner ring of the sleeve plate has multiple grooves evenly spaced, and anti-detachment plates are provided in the grooves. One end of the anti-detachment plate is slidably connected to the groove by a spring, and the other end of the anti-detachment plate has an arc-shaped surface with multiple rubber protrusions on its surface. When the sleeve plate is placed on the upper end of the column, the anti-detachment plate is pressed against the column by the spring pressure, so that the inner ring of the sleeve plate is stably clamped on the column. The notch of the fixing ring is opposite to the cross arm, so that the cross arm is placed in the inner ring of the fixing ring, ensuring that the locking rod will not hit the cross arm after being pushed out, but will be embedded in the fixing hole. At the same time, the rubber protrusions increase the friction between the outer ring of the upper end of the column and the sleeve plate.

[0036] Preferably, the connecting plate has connecting holes with connecting pins inside, and the connecting plate is fixed to both sides of the sleeve plate by the connecting pins; by opening connecting holes at different positions on the connecting plate, the two connecting plates can be adjusted to different heights, so that the fixing ring can be fitted onto the cross arms at different heights on the column, thereby improving the flexibility of the pre-assembly device.

[0037] The beneficial effects of this invention are as follows:

[0038] 1. Key Technologies for the Overall Lifting and Installation of Contact Line Supports: Utilizing the relevant data from the CPII and CPIII pile surveying foundations of high-speed railways, the assembly data for the supports can be calculated in advance. Before the supports are erected, the pre-assembled cantilever arms and other hardware are installed on the ground. This shifts a significant amount of high-altitude work to ground operations, minimizing safety risks. Compared to traditional methods, this method offers higher precision. Ground assembly of the supports reduces the difficulty of monitoring construction quality, ensuring that no quality point is overlooked. The key technologies for the overall lifting and installation of contact line support supports improve work efficiency by 60% compared to traditional methods.

[0039] 2. This invention is applicable to the assembly and construction of overhead contact line supports for conventional and high-speed railways (passenger dedicated lines and intercity lines). It can solve key progress management issues such as large construction workloads and short construction periods. Improving the first-pass yield rate of overhead contact line cantilever arm assembly can avoid problems with pre-assembled cantilever arms, ensuring efficient and precise installation of the supports. The overall hoisting construction method for overhead contact line support assembly reduces safety risks and improves assembly accuracy.

[0040] 3. The gears rotate the rack, and the locking rod gradually retracts into the telescopic cavity. At this time, the fixing ring is opened, and the hoisting rope continues to be lifted. The hoisting rope lifts the sleeve plate and separates it from the top of the column. At this time, the hoisting device separates from the column, realizing the automatic separation of the hoisting rope from the column. It is not necessary for personnel to climb to the top of the column to untie the hoisting rope, reducing the probability of dangerous accidents during high-altitude operations, and facilitating the orderly operation of on-site personnel. Attached Figure Description

[0041] The invention will now be further described with reference to the accompanying drawings.

[0042] Figure 1 This is a perspective view of the contact wire cantilever arm precision pre-assembly device in this invention;

[0043] Figure 2 This is a cross-sectional view of the fit between the fixing ring and the locking rod in this invention;

[0044] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle;

[0045] Figure 4 yes Figure 2 Enlarged view of a section at point B in the middle;

[0046] Figure 5 This is a top view of the sleeve in this invention;

[0047] Figure 6 This is a cross-sectional view of the sleeve in this invention;

[0048] Figure 7 This is a diagram showing the fit between the connecting plate and the connecting hole;

[0049] In the diagram: 1. Sleeve plate; 2. Connecting plate; 3. Fixing ring; 4. Locking rod; 5. Fixing hole; 6. Gear; 7. Rack; 8. Telescopic cavity; 9. Force-bearing bladder; 10. Compression bladder; 11. Anti-detachment pin; 12. Sliding hole; 14. Anti-detachment hole; 15. Guide groove; 16. Push rod; 17. Insertion rod; 18. Insertion hole; 19. Arc groove; 20. Arc rod; 21. Arc hole; 22. Rotary groove; 23. Thrust rod; 24. Thrust hole; 25. Groove; 26. Anti-detachment plate; 27. Rubber protrusion; 28. Connecting hole. Detailed Implementation

[0050] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0051] Example 1:

[0052] A method for precise pre-assembly of overhead contact line cantilever arms, comprising a construction surveying process and a support assembly process; the construction surveying process sequentially includes determining the starting point, longitudinal measurement, transverse measurement, marking, and recording.

[0053] The determination of the starting point includes the starting point specified in the design, the starting point at the end of the bridge, the starting point at the tunnel entrance, and the turnout core pile on the outermost side of the station. The starting point specified in the design is a permanent mileage point set on-site and provided in writing by the track construction unit.

[0054] The longitudinal measurement is carried out according to the span indicated on the drawings. The measurement is carried out along the rail using a steel ruler. In the curved section, the measurement should be carried out along the rail outside the curve. During the measurement process, attention should be paid to checking the mileage with the kilometer markers and other buildings on site and making timely adjustments. In the curved section, the error should be evenly distributed in the curved section. After the longitudinal measurement of each anchor section, the length of the entire anchor section should be checked to see if it matches the drawings.

[0055] The lateral measurement is consistent with the position determined by the longitudinal measurement for single-track sections. For multi-track sections, the isosceles triangle rule is used for positioning. Based on the position determined by the longitudinal measurement point, two points are determined 5 meters to each side of the main track and important tracks. The third point of the triangle is then transferred to the adjacent rail using the isosceles triangle principle. The two points are used to determine a straight line and the rails of each track are marked.

[0056] The markings are as follows: when measuring laterally, the foundation position is marked on the side of the top of each track with paint. On the track side close to the foundation position, a vertical line is marked on the web of the rail with red paint to indicate the position of the support or guy wire and to indicate the support number.

[0057] The aforementioned record-keeping involves making accurate measurement records based on the measurement findings, filling out negotiation forms based on any changes made on-site, and promptly completing the change procedures.

[0058] The column assembly process includes construction preparation, calculation and pre-configuration, column installation and record filling in sequence.

[0059] During the construction preparation, the installation height of the base should strictly follow the design requirements, and be measured upwards with the center height of the rail surface connection line as the reference point.

[0060] The calculation pre-fitting involves measuring the support parameters based on the required parameters for the wrist arm, and simultaneously calculating the following parameters based on the wrist arm: the length of the horizontal and inclined wrist arms; the length of the positioning tube; the distance between the positioning ring and the end of the inclined wrist arm; the distance between the positioning double ring and the fixed end of the positioning tube; and the length and installation position of the wrist arm support tube and the positioning support tube. Then, the above parameters are compiled into a wrist arm pre-fitting data table corresponding to the support numbers. The reference data provided in the wrist arm pre-fitting data table is marked on the wrist arm to be cut.

[0061] The support column is installed as follows:

[0062] S1: The cantilever arm is pre-assembled in the assembly workshop and then transported to the installation site. At the same time, the support column is transported to the site and unloaded on the ground. Two square timbers need to be placed on the ground as pads to ensure that there is space between the support column and the gap, so that there is room when installing materials on site.

[0063] S2: Support assembly. According to the construction log, the pre-assembled cantilever materials are installed on the support as required. Ground workers use ropes to lift the pre-assembled cantilever to the height of the lower cantilever base.

[0064] S3: The entire support column is hoisted. Before hoisting, the on-site quality inspector must check the construction log to see if the wrong materials are used, whether the installation height is appropriate, and whether the tightening torque is in place. After confirming that everything is correct, the support column is hoisted in conjunction with a crane using hoisting equipment.

[0065] The implementation is based on a trackless measurement platform. This platform uses CP-III precision measurement network data to perform laser three-point positioning of the center point, so as to achieve the purpose of accurate positioning of the contact network. Since high-speed railways require good stability, continuity and high smoothness, high-precision three-dimensional control measurement technology is required during construction. The application of CP-III technology meets the requirements and needs of high-speed railway construction, operation and maintenance.

[0066] Because of the precise location of the CP-III precision survey network, this measurement platform uses laser three-point positioning technology to select any three points in the CP-III precision survey network as fixed coordinate points, and uses three CP-III stakes to accurately locate the position of the trackless measurement platform.

[0067] Since the location of any stake in the CP-III precision measurement network is accurate and any selected benchmark is independent, the measurement tool designed in this paper has independent measurement points. When an error is found in the measurement of a certain point, there is no need to remeasure other points, which greatly improves the measurement efficiency.

[0068] Before installing the support pillars, pre-install and adjust the foundation adjusting nuts. All contact wire support pillars are fixed using flanges. The fixing method involves one adjusting nut under the support flange, two fixing nuts on the support flange, and one nut below for adjusting the pillar's slope. Since the contact wire is always tilted in the opposite direction of force, the relationship between the height difference of the adjusting nuts under the support flange and the slope is pre-calculated (see Formula A).

[0069] Formula A:

[0070] The amount of nut lift on the load-bearing side of the support column is calculated using the following formula:

[0071] a = e × m / L

[0072] a - The amount of nut elevation on the load-bearing side of the support column (mm);

[0073] e – The tilt value at the top of the support column (in mm);

[0074] L – Column height (mm);

[0075] m — width of the bottom of the support column (mm).

[0076] Reference Figure 1-2A precision pre-assembly device for overhead contact line cantilever arms is disclosed. This device is applicable to any of the aforementioned precision pre-assembly methods for overhead contact line cantilever arms. The pre-assembly device is the hoisting device described in S3. The hoisting device includes a sleeve plate 1 and a fixing mechanism. The sleeve plate 1 is fitted onto the upper end of a column, and fixing mechanisms are connected to both sides of the sleeve plate 1. The fixing mechanism includes a connecting plate 2, a fixing ring 3, and a locking rod 4. One end of the connecting plate 2 is fixedly hung on the sleeve plate 1, and the other end of the connecting plate 2 is fixedly connected to the fixing ring 3, which is a band-shaped... The ring has a notched shape with a notch angle of 110-120°. One end of the fixed ring 3 has a drive unit, and the other end has a fixing hole 5. The drive unit includes a motor, a gear 6, and a rack 7. The motor is fixed to the fixed ring 3, and the gear 6 at the motor output end meshes with the rack 7. The rack 7 is arc-shaped and fixed to the outer ring of the arc-shaped locking rod 4. One end of the locking rod 4 is slidably connected to a telescopic cavity 8 within one end of the fixed ring 3, and the other end of the locking rod 4 is embedded in the fixing hole 5. The sliding connection is made inside the telescopic cavity 8; the sleeve 1 is fitted onto the upper end of the column, the connecting plate 2 is close to the outer ring of the column, and the fixing ring 3 is also close to the column. The fixing ring 3 is fitted at the fixed connection point between the cross arm and the column. The drive motor and gear 6 drive the locking rod 4 to extend out of the telescopic cavity 8 through the rack 7. The other end of the locking rod 4 is embedded in the fixing hole 5. At this time, the fixing ring 3 and the locking rod 4 form a complete circle, wrapping around the cross arm. The lifting rope is tied to the binding ring on the sleeve 1, and the column is lifted up. Then the lower part of the column is lifted up. Once the end is stabilized on the ground, the hoisting rope is lowered until it is slack. Then, the drive motor reverses, and the gear 6 rotates the rack 7. The locking rod 4 gradually retracts into the telescopic cavity 8. At this time, the fixing ring 3 is opened, and the hoisting rope continues to be lifted. The hoisting rope lifts the sleeve 1 and detaches it from the top of the column. At this time, the hoisting device detaches from the column, realizing that the hoisting rope automatically detaches from the column. It is not necessary for personnel to climb to the top of the column to untie the hoisting rope, reducing the probability of dangerous accidents during high-altitude operations, and facilitating the orderly operation of on-site personnel.

[0077] Reference Figure 3An anti-detachment mechanism is provided at the bottom of the fixing hole 5. The anti-detachment mechanism includes a force-bearing bladder 9, a compression bladder 10, and an anti-detachment pin 11. The force-bearing bladder 9 is bonded to the bottom surface of the fixing hole 5 and is connected to the compression bladder 10. The compression bladder 10 is located in a cavity opened on one side of the fixing hole 5. A sliding hole 12 is opened between the cavity and the fixing hole 5. One end of the anti-detachment pin 11 is connected to the inner wall of the cavity by a spring and is pressed against the compression bladder 10. The other end of the anti-detachment pin 11 is fixed through the sliding hole 12 and embedded in the anti-detachment hole 14 opened at the other end of the locking rod 4. The locking rod 4 is pressed against the force-bearing bladder 9. The gas in the force-bearing bladder 9 is blown into the compression bladder 10. The compression bladder 10 expands and presses against the anti-detachment pin 11. The anti-detachment pin 11 is embedded in the anti-detachment hole 14, fixing the locking rod 4 in the fixing hole 5, further improving the stability of the locking rod 4, thereby improving the stability of the complete circle formed by the fixing ring 3 and the locking rod 4, and ensuring the safety of the hoisting operation.

[0078] Reference Figure 2-3 The inner ring of the locking rod 4 has a guide groove 15, which runs along the inner ring of the locking rod 4. Push rods 16 are symmetrically arranged within the guide groove 15. One end of each push rod 16 is beveled, with ball bearings on the bevel. The other end of one push rod 16 is fixedly connected to an L-shaped insert rod 17. The end of the insert rod 17 slides through the anti-detachment hole 14 via a spring and is embedded in the insertion hole 18 on the outer ring of the anti-detachment pin 11. The cross arm presses against the beveled surface at one end of the push rod 16, causing one push rod 16 to move towards the other end of the locking rod 4. Simultaneously, one push rod 16 pushes the insert rod 17, and the end of the insert rod 17 is embedded in the insertion hole 18, further fixing the anti-detachment pin 11 to the anti-detachment hole 14. This further improves the stability of the locking rod 4, and consequently, the stability of the complete ring formed by the fixing ring 3 and the locking rod 4, ensuring the safety of the hoisting operation.

[0079] Reference Figure 2 and Figure 4 An arc-shaped groove 19 is provided at one end of the locking rod 4, and an arc-shaped rod 20 is provided in the arc-shaped groove 19. An arc-shaped hole 21 is provided in the telescopic cavity 8 near the gear 6. One end of the arc-shaped rod 20 is attracted to the other end face of another push rod 16 by a magnet, and the other end of the arc-shaped rod 20 is embedded in the arc-shaped hole 21. The cross arm presses against the inclined surface of one end of the push rod 16, and the other end of the other push rod 16 presses against the arc-shaped rod 20. The arc-shaped rod 20 moves along the arc-shaped groove 19 and is embedded in the arc-shaped hole 21. At this time, one end of the locking rod 4 is further fixed in the telescopic cavity 8, which further improves the stability between the locking rod 4 and the telescopic cavity 8.

[0080] Reference Figure 4A groove 22 is formed on one side of the arc-shaped hole 21, and a thrust rod 23 is provided in the groove 22. One side of the groove 22 is connected to the arc-shaped hole 21, and the other side of the groove 22 extends into the telescopic cavity 8. One end of the thrust rod 23 is placed at the bottom of the arc-shaped hole 21, and the other end of the thrust rod 23 is bent towards the push rod 16 and embedded in the thrust hole 24 formed on the push rod 16. The bent part of the thrust rod 23 is rotatably connected to the groove 22 by a torsion spring. The end of the arc-shaped rod 20 presses against one end of the main push rod 16, and the other end of the thrust rod 23 is embedded in the thrust hole 24, so that the thrust rod 23, the arc-shaped rod 20 and the push rod 16 form a closed locking ring structure, which further improves the stability between the locking rod 4 and the telescopic cavity 8.

[0081] Reference Figure 5-6 The inner ring of the sleeve plate 1 has multiple grooves 25 evenly distributed, and anti-detachment plates 26 are provided in the grooves 25. One end of the anti-detachment plate 26 is slidably connected to the groove 25 by a spring, and the other end of the anti-detachment plate 26 is arc-shaped, and the surface of the other end of the anti-detachment plate 26 is provided with multiple rubber protrusions 27. When the sleeve plate 1 is sleeved on the upper end of the column, the anti-detachment plate 26 is pressed against the column by the compression force of the spring, so that the inner ring of the sleeve plate 1 is stably clamped on the column. The notch of the fixing ring 3 is opposite to the cross arm, so that the cross arm is placed in the inner ring of the fixing ring 3, ensuring that the locking rod 4 will not push against the cross arm after being pushed out, but is embedded in the fixing hole 5. At the same time, the friction between the outer ring of the upper end of the column and the sleeve plate 1 is increased by the rubber protrusions 27.

[0082] Example 2:

[0083] Reference Figure 7 Compared with Embodiment 1, as another embodiment of the present invention, the connecting plate 2 has a connecting hole 28, and a connecting pin is provided in the connecting hole 28. The connecting plate 2 is fixed to both sides of the sleeve plate 1 by the connecting pin. By opening connecting holes 28 at different positions on the connecting plate 2, the two connecting plates 2 can be adjusted to different heights, so that the fixing ring 3 can be sleeved on the cross arm at different heights on the column, thereby improving the flexibility of the pre-assembly device.

[0084] Working principle: The sleeve plate 1 is fitted onto the upper end of the column, the connecting plate 2 is close to the outer ring of the column, and the fixing ring 3 is also close to the column. The fixing ring 3 is fitted at the fixed connection point between the cross arm and the column. The drive motor and gear 6 drive the locking rod 4 to extend from the telescopic cavity 8 through the rack 7. The other end of the locking rod 4 is embedded in the fixing hole 5. At this time, the fixing ring 3 and the locking rod 4 form a complete circle, wrapping around the cross arm. The lifting rope is tied to the binding ring on the sleeve plate 1, and the column is lifted up. Then the lower end of the column is stabilized. On the ground, the hoisting rope is lowered until it is slack. Then the drive motor reverses, the gear 6 rotates the rack 7, and the locking rod 4 gradually retracts into the telescopic cavity 8. At this time, the fixing ring 3 is opened, and the hoisting rope is raised. The hoisting rope lifts the sleeve 1 and separates it from the top of the column. At this time, the hoisting device is separated from the column, realizing that the hoisting rope is automatically separated from the column. It is not necessary for people to climb to the top of the column to untie the hoisting rope, which reduces the probability of dangerous accidents during high-altitude operations and facilitates the orderly operation of on-site personnel.

[0085] The locking rod 4 presses against the force-bearing bladder 9, and the gas inside the force-bearing bladder 9 is blown into the compression bladder 10. The compression bladder 10 expands and compresses the anti-detachment pin 11. The anti-detachment pin 11 is embedded in the anti-detachment hole 14, fixing the locking rod 4 in the fixing hole 5, further improving the stability of the locking rod 4, thereby improving the stability of the complete ring formed by the fixing ring 3 and the locking rod 4, and ensuring the safety of the hoisting operation.

[0086] The cross arm presses against the inclined surface at one end of the push rod 16. One of the push rods 16 moves toward the other end of the locking rod 4. At the same time, one of the push rods 16 pushes the insertion rod 17. The end of the insertion rod 17 is embedded in the insertion hole 18, which further fixes the anti-detachment pin 11 and the anti-detachment hole 14, thereby further improving the stability of the locking rod 4. This further improves the stability of the complete ring formed by the fixing ring 3 and the locking rod 4, ensuring the safety of the hoisting operation.

[0087] The horizontal arm presses against the inclined surface of one end of the push rod 16, and the other end of the other push rod 16 presses against the arc rod 20. The arc rod 20 moves along the arc groove 19 and is embedded in the arc hole 21. At this time, one end of the locking rod 4 is further fixed in the telescopic cavity 8, which further improves the stability between the locking rod 4 and the telescopic cavity 8.

[0088] The end of the arc-shaped rod 20 is pressed against one end of the main push rod 16, and the other end of the thrust rod 23 is embedded in the thrust hole 24, so that the thrust rod 23, the arc-shaped rod 20 and the push rod 16 form a closed locking ring structure, which further improves the stability between the locking rod 4 and the telescopic cavity 8.

[0089] When the sleeve 1 is fitted onto the upper end of the column, the anti-detachment plate 26 is pressed against the column by the compression force of the spring, so that the inner ring of the sleeve 1 is stably clamped on the column. The notch of the fixing ring 3 is opposite to the cross arm, so that the cross arm is placed in the inner ring of the fixing ring 3, ensuring that the locking rod 4 will not push against the cross arm after it is pushed out, and instead is embedded in the fixing hole 5. At the same time, the friction between the outer ring of the upper end of the column and the sleeve 1 is increased by the rubber protrusions 27.

[0090] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0091] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0092] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for fine pre-positioning of catenary arm, characterized in that: The pre-assembly method includes a construction surveying process and a support assembly process; the construction surveying process includes determining the starting point, longitudinal measurement, transverse measurement, marking, and recording. The determination of the starting point includes the starting point specified in the design, the starting point at the end of the bridge, the starting point at the tunnel entrance, and the turnout core pile on the outermost side of the station. The starting point specified in the design is a permanent mileage point set on-site and provided in writing by the track construction unit. The longitudinal measurement is carried out according to the span indicated on the drawings. The measurement is carried out along the rail using a steel ruler. In the curved section, the measurement should be carried out along the rail outside the curve. During the measurement process, attention should be paid to checking the mileage with the kilometer markers and other buildings on site and making timely adjustments. In the curved section, the error should be evenly distributed in the curved section. After the longitudinal measurement of each anchor section, the length of the entire anchor section should be checked to see if it matches the drawings. The lateral measurement is consistent with the position determined by the longitudinal measurement for single-track sections. For multi-track sections, the isosceles triangle rule is used for positioning. Based on the position determined by the longitudinal measurement point, two points are determined 5 meters to each side of the main track and important tracks. The third point of the triangle is then transferred to the adjacent rail using the isosceles triangle principle. The two points are used to determine a straight line and the rails of each track are marked. The markings are as follows: when measuring laterally, the foundation position is marked on the side of the top of each track with paint. On the track side close to the foundation position, a vertical line is marked on the web of the rail with red paint to indicate the position of the support or guy wire and to indicate the support number. The aforementioned record-keeping involves making accurate measurement records based on the measurement findings, filling out negotiation forms based on any changes made on-site, and promptly completing the change procedures.

2. The method of claim 1, wherein the method further comprises: The column assembly process includes construction preparation, calculation and pre-configuration, column installation and record filling in sequence. During the construction preparation, the installation height of the base should strictly follow the design requirements, and be measured upwards with the center height of the rail surface connection line as the reference point. The calculation pre-fitting involves measuring the support parameters based on the required parameters for the wrist arm, and simultaneously calculating the following parameters based on the wrist arm: the length of the horizontal and inclined wrist arms; the length of the positioning tube; the distance between the positioning ring and the end of the inclined wrist arm; the distance between the positioning double ring and the fixed end of the positioning tube; and the length and installation position of the wrist arm support tube and the positioning support tube. Then, the above parameters are compiled into a wrist arm pre-fitting data table corresponding to the support numbers. The reference data provided in the wrist arm pre-fitting data table is marked on the wrist arm to be cut. The support column is installed as follows: S1: The cantilever arm is pre-assembled in the assembly workshop and then transported to the installation site. At the same time, the support column is transported to the site and unloaded on the ground. Two square timbers need to be placed on the ground as pads to ensure that there is space between the support column and the gap, so that there is room when installing materials on site. S2: Support assembly. According to the construction log, the pre-assembled cantilever materials are installed on the support as required. Ground workers use ropes to lift the pre-assembled cantilever to the height of the lower cantilever base. S3: The entire support column is hoisted. Before hoisting, the on-site quality inspector must check according to the construction log to ensure that the correct materials are used, the installation height is appropriate, and the tightening torque is in place. After confirming that everything is correct, the support column is hoisted by a crane in conjunction with the hoisting equipment.

3. The method for precise pre-assembly of a catenary cantilever arm according to claim 2, characterized in that: Before installing the support pillars, pre-install and adjust the foundation adjusting nuts. All contact wire support pillars are fixed using flanges. The fixing method involves one adjusting nut under the support flange, two fixing nuts on the support flange, and one nut below for adjusting the pillar's slope. Since the contact wire is always tilted in the opposite direction of force, the relationship between the height difference of the adjusting nuts under the support flange and the slope is pre-calculated (see Formula A). Formula A: The amount of nut lift on the load-bearing side of the support column is calculated using the following formula: a = e × m / L a - The amount of nut lift on the load-bearing side of the support (mm); e – Inclination value at the top of the support column (mm); L – Column height (mm); m — Width of the base of the support column (mm).

4. A precision pre-assembly device for overhead contact line cantilever arms, characterized in that: This pre-assembly device is applicable to any of the contact wire cantilever fine pre-assembly methods in claims 2-3. The pre-assembly device is the hoisting device described in S3. The hoisting device includes a sleeve plate (1) and a fixing mechanism. The sleeve plate (1) is fitted onto the upper end of the column in the middle, and fixing mechanisms are connected to both sides of the sleeve plate (1). The fixing mechanism includes a connecting plate (2), a fixing ring (3), and a locking rod (4). One end of the connecting plate (2) is fixedly hung on the sleeve plate (1), and the other end of the connecting plate (2) is fixedly connected to the fixing ring (3). The fixing ring (3) is a ring with a notch, and the notch angle is 110°. 120°, a drive unit is provided at one end of the fixed ring (3), and a fixed hole (5) is opened at the other end of the fixed ring (3); the drive unit includes a motor, a gear (6) and a rack (7); the motor is fixedly connected to the fixed ring (3), the output gear (6) meshes with the rack (7), the rack (7) is arc-shaped, the rack (7) is fixedly connected to the outer ring of the arc-shaped locking rod (4), one end of the locking rod (4) is slidably connected to the telescopic cavity (8) opened in one end of the fixed ring (3), the other end of the locking rod (4) is embedded in the fixed hole (5), and the locking rod (4) is slidably connected in the telescopic cavity (8); The bottom of the fixing hole (5) is provided with an anti-detachment mechanism; the anti-detachment mechanism includes a force-bearing bladder (9), a compression bladder (10) and an anti-detachment pin (11); the force-bearing bladder (9) is bonded to the bottom surface of the fixing hole (5), the force-bearing bladder (9) is connected to the compression bladder (10), the compression bladder (10) is located in a cavity opened on one side of the fixing hole (5), a sliding hole (12) is opened between the cavity and the fixing hole (5), one end of the anti-detachment pin (11) is connected to the inner wall of the cavity by a spring and is pressed on the compression bladder (10), the other end of the anti-detachment pin (11) is fixed through the sliding hole (12) and embedded in the anti-detachment hole (14) opened at the other end of the locking rod (4).

5. The contact wire cantilever arm precision pre-assembly device according to claim 4, characterized in that: The inner ring of the locking rod (4) has a guide groove (15), which is opened along the inner ring of the locking rod (4). Push rods (16) are symmetrically arranged in the guide groove (15). One end of the two push rods (16) is set as an inclined plane, and a ball is provided on the inclined plane. The other end of one of the push rods (16) is fixed to an L-shaped insert rod (17). The end of the insert rod (17) slides through the anti-disengagement hole (14) through the spring and is embedded in the insertion hole (18) opened on the outer ring of the anti-disengagement pin (11).

6. The contact wire cantilever arm precision pre-assembly device according to claim 5, characterized in that: An arc-shaped groove (19) is provided at one end of the locking rod (4), and an arc-shaped rod (20) is provided in the arc-shaped groove (19); an arc-shaped hole (21) is provided in the telescopic cavity (8) near the gear (6), and one end of the arc-shaped rod (20) is attracted to the other end face of another push rod (16) by a magnet, and the other end of the arc-shaped rod (20) is embedded in the arc-shaped hole (21).

7. The contact wire cantilever arm precision pre-assembly device according to claim 6, characterized in that: A groove (22) is opened on one side of the arc-shaped hole (21). A thrust rod (23) is provided in the groove (22). One side of the groove (22) is connected to the arc-shaped hole (21). The other side of the groove (22) extends into the telescopic cavity (8). One end of the thrust rod (23) is placed at the bottom of the arc-shaped hole (21). The other end of the thrust rod (23) is bent towards the push rod (16) and embedded in the thrust hole (24) opened on the push rod (16). The bent part of the thrust rod (23) is rotatably connected to the groove (22) by a torsion spring.

8. The contact wire cantilever arm precision pre-assembly device according to claim 4, characterized in that: The inner ring of the sleeve (1) has a plurality of grooves (25) evenly provided. An anti-detachment plate (26) is provided in the groove (25). One end of the anti-detachment plate (26) is slidably connected in the groove (25) by a spring. The other end of the anti-detachment plate (26) is an arc-shaped surface, and the surface of the other end of the anti-detachment plate (26) is provided with a plurality of rubber protrusions (27).

9. The contact wire cantilever arm precision pre-assembly device according to claim 4, characterized in that: The connecting plate (2) has a connecting hole (28) and a connecting pin is provided in the connecting hole (28). The connecting plate (2) is fixed to both sides of the sleeve plate (1) by the connecting pin.

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