A construction method for double-bearing and double-conducting contact network

Abstract

The present invention relates to the field of urban rail transit technology and to the research field of electrical contact network construction technology. Specifically, it provides a double-support, double-conductor contact network construction method, including S1: erection of double-load cables; S2: erection of double-branch contact wires; and S3: installation of dropper strings and fine-tuning of positioning devices. Compared with existing construction methods, the present invention solves four key problems associated with "double-support, double-conductor" construction: unequal heights of the two wires, inconsistent spacing, unequal tension between the two wires within the equivalent span between each dropper string, and twisting of the contact wire at the anchor point. The improvements are particularly significant in curved sections.

Description

Technical Field

[0001] The invention belongs to the technical field of urban rail transit, relates to the research field of electrical contact network construction technology, and specifically is a contact network double-bearing and double-conducting construction method. Background Art

[0002] Currently, the construction of a double-support, double-conductor overhead contact network involves thirteen steps and processes, including the main structural installation process: support assembly, arm installation, double-support center anchor rope installation, double-load cable installation, load cable return, arm offset adjustment, double-conductor installation, double-conductor center anchor installation, positioning device installation and adjustment, dropper installation, electrical connection installation, contact suspension adjustment, and anchor adjustment. Functionally, these steps can be divided into four parts: support work, positioning work, electrical connection, and contact suspension work. This process primarily involves electric trains obtaining power from the double-conductor via roof-mounted pantographs.

[0003] The following problems exist in the existing technology: after the double-support cable and the double-branch contact wire are erected, the positioning device will be installed. When the double-support cable is returned to its original position from the center anchor knot to the lower anchor direction, the arm offset is adjusted, and the line surface is corrected by the positioning device, only one set of turnbuckle bolts is designed for each contact wire of the existing lower anchor connection component. Due to the excessive length of the entire anchor section of the entire wire and the influence of the middle anchor, the two factors combine to cause the torsion direction, angle, and number of turns of each wire of the double-support cable to be different, resulting in the two wires being unequal in height and the line surface of the contact wire being unable to freely realize automatic rotation and normal working state according to the natural normal state, resulting in the two contact wires having different spacings after large seasonal temperature differences; after the double-support cable is erected, the two wires are unequal in height and exceed the allowable standard of 4mm, and the cable clamp side of the support cable cannot be installed horizontally; therefore, whether the two wires are equal in height and the two contact wire surface heights and spacings are consistent are more important for the double-bearing and double-conducting construction of the contact network and the effective current reception of the pantograph of the electric passenger car. Summary of the Invention

[0004] Based on the problems existing in the prior art, the present invention proposes a contact network double-bearing and double-conducting construction method, comprising the following steps:

[0005] S1: Dual-cabling installation: Two cables are deployed simultaneously, and anchoring tools are installed at the anchoring point and the anchoring point. After anchoring, installing the center anchor knot of the catenary cables, and offsetting and returning the cantilevers of the dual-cabling cables, the anchoring tools at the anchoring point and the anchoring point are removed and replaced with anchoring connecting components.

[0006] S2: Double-branch contact wire installation: The two contact wires are deployed simultaneously. Anchoring tools are installed at the anchoring point. The tension of the two contact wires is tightened to the rated value using a tensioning tool. Anchoring tools are installed at the anchoring point. The anchoring tools are connected to the final anchor clamp of the anchor connection component. The tensioning tools are removed and the center anchor knot of the contact wire is installed. The positioning devices are installed from the center anchor to the anchors at both ends.

[0007] S3: Installation of suspension strings and fine adjustment of the positioning device: Measure and mark the installation position of the suspension strings on the contact line, install the suspension strings from the middle anchor to the lower anchor, and install the suspension strings one by one using the double-bearing and double-guide suspension string installation tool. After the suspension strings are installed and the positioning device and suspension strings are installed and adjusted, remove the anchoring tool and replace it with the anchoring connection component.

[0008] Based on the above solution, step S1 of erecting double load-bearing cables also includes the following specific steps:

[0009] S11: Temporary anchoring of the catenary is completed by using the anchoring tool;

[0010] After the double-branch cable is deployed to the anchoring position, the tension of the double-branch cable is adjusted to the rated tension value, and the anchoring tool is installed between the compensation device and the end of the cable;

[0011] S12: Remove the load of the line tightening tool at the anchoring location;

[0012] After dismantling, install the center anchor knot of the load-bearing cable and turn the compensation device at the anchoring point back into a live anchor;

[0013] S13: Double-supported cables with equal height;

[0014] S14: The load-bearing cable is returned to its original position, and the anchoring tool is removed and replaced with the anchoring connection component.

[0015] On the basis of the above scheme, step S2 of erecting the double-branch contact wires further includes the following specific steps:

[0016] S21: Temporary anchoring of the catenary is completed by using the anchoring tool;

[0017] S22: Remove all tensioning tool loads at the anchor drop location;

[0018] S23: Install the contact wire center anchor;

[0019] Use two sets of ladder trucks to install the pay-off pulleys from the center anchor to the anchors at both ends, install the positioning device, and pay attention to suspending the two lines at the same height when replacing the temporary hanging strings.

[0020] Based on the above solution, step S3, installation of the hanging string and fine adjustment of the positioning device, includes the following specific steps:

[0021] S31: Measure and mark the installation position of the suspension string;

[0022] Before installing the hanging strings, organize two teams of ladder trucks to measure and mark the hanging string installation positions on the contact line according to the hanging string spacing calculation sheet. When measuring, measure from the center column of the middle anchor toward the lower anchor.

[0023] S32: Install the hanging string using a hanging string installation tool;

[0024] S33: Replace the anchoring tool with the anchoring connection component;

[0025] After the positioning device and the suspension string are installed and adjusted, two sets of ladder trucks are used to first remove the line-paying pulley, and then the fixed pulleys at the anchoring and anchoring locations are removed and replaced with anchor connection components using the line tightening tools.

[0026] On the basis of the above scheme, step S1 also includes installing an anchoring tool at the anchoring point, and temporarily fixing it with a compensation device at the anchoring point, so that the two supporting force cables are kept at the same height when they are extended to the horizontal arm pulley.

[0027] On the basis of the above scheme, in the process of laying out the clue in step S1, the straight line segment of the wrist arm is fixed at every two suspension points, and each curved portion of the wrist arm is fixed.

[0028] On the basis of the above solution, during the installation of the positioning device in step S23, a spacer block is set between the two contact lines when adjusting the pull-out value, and the width of the spacer block is 30 mm.

[0029] Compared with existing construction methods, the construction method of the present invention achieves equal heights for both supporting cables during the installation of the load-bearing cables, and quickly and naturally adjusts the contact line surface to its normal state during the installation of the contact line, thereby improving accuracy and reducing errors. Furthermore, it provides better tension uniformity in resolving the problem of unequal heights of the two contact lines when the working surfaces of the two contact lines are not parallel to the rail plane line at curves. By providing anchoring tools with automatic tension balancing and self-twisting torque release functions after the cables are stressed or after construction at the two anchor points of the anchor section, the spacing allowances, height difference allowances, positioning pull-out values, and unequal spacing allowances of the two positioning devices from the middle anchor to the lower anchor are all balanced in tension and the cable torsion is released at the anchor point. This fundamentally solves the four key problems of "double-bearing, double-conducting" systems: unequal heights of the two cables, inconsistent spacing, unequal tensions between the two cables between the suspension strings within the equivalent span, and contact line torsion at the anchor point. The improvement is particularly significant in curved sections. The construction method of the present invention achieves dual-line tension and equal height in the double-bearing, double-conducting contact network construction process. Furthermore, it improves installation and adjustment efficiency and quality, effectively coordinates adjustment operations, and enhances the overall process level. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of the anchoring tool in Example 1 of the present invention;

[0031] Figure 2 This is a schematic structural diagram of the lower anchor connection component in Example 1 of the present invention;

[0032] Figure 3This is a structural diagram of the installation state of the compensation device and the lower anchor connection component in Example 1 of the present invention;

[0033] In the picture:

[0034] 1. Mounting ring; 2. U-shaped fixing clamp; 3. Pin shaft; 4. Balance pulley; 5. Intermediate shaft; 6. Protection box; 7. Rope; 8. Rotator; 9. Terminal clamp; 10. Anchor insulator; 11. D1 type double plate; 12. T1 type three-hole adjustment plate; 13. D2 type double plate; 14. Adjustment bolt; 15. Terminal anchor clamp. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be noted that the following examples are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0036] Example 1

[0037] After the double-support force cable and double-branch contact line are erected, the positioning device will be installed. The existing anchor connection components lack adjustment function. If they are installed directly, it will cause the torsion direction, angle and number of turns of each branch of the double-support force cable to be different, resulting in the two lines being unequal in height and the contact line surface being unable to automatically rotate freely according to the natural normal working state. As a result, the two contact lines have inconsistent spacing between the two lines and unequal heights after large seasonal temperature differences. In order to solve this problem, anchor tools and string installation tools are used to temporarily replace the anchor connection components for installation during the construction process. After the free adjustment of the lines and the contact suspension adjustment are completed, the anchor tools are replaced with the anchor connection components to complete the installation.

[0038] like Figure 1-3 As shown, the present invention provides a contact network double-bearing and double-conducting construction method, comprising the following steps:

[0039] S1: Double-loaded cable installation: Two cables are deployed simultaneously. Anchoring tools are installed at the anchoring point and temporarily fixed with a compensation device at the anchoring point. When deploying the two cables to the horizontal wrist arm to hang the pulley, they must be at the same height. The anchoring tools are installed after the two cables are deployed to the anchoring point. After completing the sequence of anchoring, installing the double-loaded center anchor, and returning the double-loaded wrist arm to its offset position, the anchoring tools on the anchoring and anchoring sides are removed and the anchoring connection components are replaced.

[0040] As a specific solution, the double-loaded cable installation includes the following steps:

[0041] S11: Temporary anchoring of the catenary is completed by using the anchoring tool;

[0042] After the double-branch cable is extended to the anchoring position, a 6-ton hand-operated chain hoist is used to adjust the tension of the double-support cable to the rated tension value, and then the anchoring tool is installed between the compensation device and the end of the cable.

[0043] S12: Remove all tensioning tool loads at the anchor drop location;

[0044] After the removal, the center anchor knot of the load-bearing cable is installed, and the ratchet iron wire and the steel wire clip for fixing the balance wheel at the anchoring point are removed to turn it back into a live anchor (in particular, the balance pulley 4 of the anchoring tool is also connected to the anchoring point before the anchoring point, and the two steel wire sleeves are clamped in parallel with the steel wire clip to prevent the steel wire sleeves from moving during the wiring process). Then, two sets of ladder cars are used to install the load-bearing cable pay-out pulleys from the center anchor knot to the anchors at both ends, and the wrist arm offset is adjusted to officially return the load-bearing cable to its position.

[0045] S13: Double-supported cables with equal height;

[0046] When returning the load-bearing cables to their original positions, pay attention to checking the previous span that has been returned to its original position and the height of the two supporting cables.

[0047] S14: Replace the anchoring tool with the anchoring connection component.

[0048] After the two groups of ladder trucks completed the work of returning the load-bearing cables to their original positions, they used tensioning tools to remove the fixed pulleys of the anchoring tools, replaced the upper and lower anchor connection components, and completed the installation of the double load-bearing cables.

[0049] like Figure 1 As shown, the above-mentioned anchoring tool is a tool for anchoring on the contact line. The anchoring tool of the patent: A special tool for anchoring a double-bearing and double-conducting contact network suspension - CN201821984967.8 can be used, and other types of anchoring tools can also be used; specifically, CN201821984967.8 - A special tool for anchoring a double-bearing and double-conducting contact network suspension, includes a mounting ring 1, a U-shaped fixing splint 2 and a balancing pulley 4, one end of the mounting ring 1 is rotatably connected to the U-shaped fixing splint 2 through a through-pin shaft 3, a balancing pulley 4 is provided inside the U-shaped fixing splint 2, an intermediate shaft 5 is provided at the center of the balancing pulley 4, protective boxes 6 are fixed on both sides of the U-shaped fixing splint 2, a rope 7 is provided on the outside of the balancing pulley 4, rotators 8 are installed at both ends of the rope 7, and one end of the rotator 8 is movably connected to the terminal wire clamp 9 through a connecting piece 11.

[0050] like Figure 2 As shown, the above-mentioned anchor connection components adopt conventional commercially available equipment, generally including an anchor insulator 10, a D1 type double plate 11, a T1 type three-hole adjustment plate 12, a D2 type double plate 13, an adjustment bolt 14 and a terminal anchor clamp 15, which does not belong to the innovation of the present invention and will not be described in detail here.

[0051] When the two cables are erected, the two temporary terminals are connected to the D2 type double-jointed plate respectively, and the anchoring tool is connected to the compensation device and the balancing pulley 4 hanging ring at one end near the pillar side, and the wire sleeve is folded in half and sleeved on the balancing pulley 4, and the two ends of the wire sleeve are connected to the rotator 8 and the D2 type double-jointed plate 13 respectively. The functional characteristics of such a connection form are that the two cables are in the process of returning the load-bearing cable pay-out pulley to its original position, adjusting the arm offset, adjusting the pull-out value, installing the contact line positioning device, installing the hanging string, paying-out pulley, and adjusting the positioning. When the two cables are equal in height, tension is equal, the contact line torsion surface, and the load-bearing cable twisting force is released, the balancing wheel plays a role in freely adjusting the equal tension; the rotator 8 plays a role in installing the positioning device to reverse the twisting contact line working surface and restore it to normal, and the load-bearing cable is longitudinally subjected to the longitudinal tension and the twisting force is released, which provides an important condition guarantee for the two cables to be highly consistent under the equal tension.

[0052] Specifically, in order to ensure the same height, the fixed pulley used for laying out the line and paying out the line is a double-groove nylon pulley; in order to prevent the wrist arm from swinging during the line laying process, the wrist arm is fixed once for every two hanging points in the straight section, and once for every wrist arm at the curve. The non-support wrist arm must be firmly fixed when it is converted. When the two supporting force cables are laid out to the anchor span, a tensioning tool (including a pulley block, a fixed pulley and a tensioner) is first used. The pulley block uses a 1:4 pulley ratio long-stroke pulling tool. Specifically, The pulley block (connecting a set of fixed pulleys and two tensioners) tightens the two supporting cables simultaneously, and then uses a 6-ton hand to pull down the chain to start the formal tensioning. When the normal tension of the anchoring tools and the weights at the anchoring and dropping anchoring meet the requirements, the middle anchor of the load-bearing cable is installed in parallel with the two supporting cables using the middle anchor clamp. After the center anchor knot is installed, the temporary fixing wire or steel wire clip of the anchoring tool at the anchoring is removed, and the anchoring tool is installed between the compensation device at the anchoring and the temporary terminals of the two supporting cables (Patent No. 201821984967 8) Remove the tensioning tool. At this time, organize two groups of ladder truck personnel to move from the middle anchor to the lower anchor respectively to return the pay-out pulley to its position, install the wire protection material and adjust the arm offset. Cover the load-bearing cable support cover plate without tightening the bolts first. After completing a series of work on a suspension point, work on the next span and check whether the two supporting cables of the previous span are at the same height. If not, use a φ16mm nylon rope to connect the double-groove pay-out pulley and place it upside down on the two supporting cables. Use the inertial action of manual downward pulling and upward loosening to level the two supporting cables. , then use a torque wrench to tighten the double-slot cover bolts of the load-bearing cable support at the upper hanging point, and use this method to gradually complete the return of the line pulley of the entire anchor section, the return of the load-bearing cable, and the adjustment of the arm offset and the equal height of the two lines in the direction of anchoring. Then use the hand-operated chain hoist to remove the anchoring tools on the anchoring and anchoring sides, replace the upper and lower anchor connection parts, and check whether the anchoring transmission device is normal (whether the load-bearing cable height and the design and vertical projection value of the contact line are within the standard range, laying the foundation for the erection of the contact line).

[0053] Among them, the contact network compensation device is a general term for the compensator and its braking device that automatically adjusts the tension of the contact line and the load-bearing cable. The compensation device is also called the tension automatic compensator, which is installed at both ends of the anchor section and is connected in series in the contact line load-bearing cable. Its function is to compensate for the tension changes in the wire and keep the tension constant. The function of the compensation device is that when the temperature changes, the wire will stretch or shorten due to the influence of temperature. Due to the effect of the weight of the compensating weight, the wire will move along the direction of the line and automatically adjust the wire tension, and keep the slack of the wire in compliance with regulations, thereby ensuring the technical state of the contact suspension. Figure 3 As shown, in general, the compensation device is a ratchet compensation device, which includes a compensation pulley, a sinker, a sinker limiting frame for guiding the sinker along the length of the pillar, and a sinker rod. The two ends of the sinker limiting frame are fixed to the pillar, one end of the sinker rod is connected to the load-bearing cable and the other end is connected to the sinker. The sinker is connected to the sinker limiting frame through a support frame. The compensation pulley can be divided into a fixed pulley structure and a movable pulley structure in application. The fixed pulley structure changes the direction of force, while the movable pulley structure not only changes the direction of force but also saves effort and can move the position. Therefore, the compensation pulley is generally used as a combined pulley block. Among them, the ratchet compensation device is fixed by three strands of 4.0 iron wire. The compensation pulley uses a steel wire clip to connect the compensation ropes of the fixed and movable pulleys. The sinker string is reinforced with a φ14mm anti-slip rope to prevent rapid fall.

[0054] The compensation device, arm and load-bearing cable in this embodiment can adopt conventional commercially available equipment, which does not belong to the innovation of the present invention and will not be described in detail here.

[0055] S2: Double-branch contact wire installation: The two contact wires are deployed simultaneously. Anchoring tools are installed at the anchoring point, and the anchoring point is temporarily fixed with a compensation device (the ratchet compensation device is fixed with three strands of 4.0 iron wire. The pulley compensation device uses a steel wire clip to clamp the upper and lower compensation ropes between the movable and fixed pulleys together. The steel wire clips are fixed at three locations, each 300mm apart). The tension of the two contact wires is tightened to the rated value using a tensioning tool. At the same time, the normal operation of the compensation device at the anchoring point is observed. Then, a set of anchoring tools is added to the anchoring point. The anchoring tools are connected to the final anchor wire clamp 15 of the anchoring connection component. All tensioning tools are then removed and the center anchor knot of the contact wire is installed. Ensure that the tension and sag of the auxiliary ropes at both ends and the double center anchor knot are consistent.

[0056] As a specific solution, the installation of double-branch contact lines includes the following steps:

[0057] S21: Temporary anchoring of the catenary is completed by using the anchoring tool;

[0058] The construction method is the same as that described in step S11 and will not be described again here.

[0059] S22: Remove all tensioning tool loads at the anchor drop location;

[0060] Remove the ratchet wire and the steel wire clip for fixing the balance wheel at the anchoring place to turn it back into a live anchor (particularly, before anchoring, as in step S12, the balance pulley 4 of the anchoring tool is connected to the anchoring place, and the two steel wire sleeves are clamped in parallel with the steel wire clip to prevent the steel wire sleeves from moving during the wiring process).

[0061] S23: Install the center anchor of the contact line (i.e. the center anchor auxiliary line);

[0062] Use two sets of ladder cars to install contact line pay-out pulleys from the central anchor to both ends respectively, and install positioning devices (when installing the positioning device, adjust the pull-out value and pay attention to hang a 30mm wide spacer between the two contact lines to ensure that the distance between the two lines is always uniform). In addition, when the pay-out pulleys are reversed and replaced with temporary hanging strings, pay attention to suspend the two lines at the same height. When the two sets of ladder cars reverse the pay-out pulleys and install the positioning devices to the anchor span, pay attention to check whether the contact line surface has returned to normal state, and determine the working state of the rotator of the temporary anchor rotating balance pulley 4.

[0063] The above-mentioned positioning device is a common contact network component used to pull the contact line horizontally to the design required position. It does not belong to the innovation of the present invention and will not be described in detail here.

[0064] The above-mentioned anchoring tool and compensation device have the same structure as those in step S1 and will not be described in detail here; the tightening tool, contact wire and positioning device in this embodiment can all adopt conventional commercially available equipment, which does not belong to the innovation of the present invention and will not be described in detail here.

[0065] Specifically, the falling top is hoisted with an anti-slip rope as a measure to prevent rapid falls. When manually deploying a double-branch contact line, when using a ladder truck to hang the line onto the pay-out pulley on the load-bearing cable, the distance from the wire drum should be maintained between 50 and 60 meters. The contact line should be kept away from surrounding tools as much as possible to prevent scratches on the contact line and the formation of "hard spots" in the bend. The hanging ladder truck should use a rope slide to slide the line onto the hanging pay-out pulley at a distance of 0.5 meters from the ladder truck frame. Workers should not use brute force to lift or carry the contact line. When guiding the contact line into the pay-out pulley, pay attention to the twisting changes of the contact line surface. In curved sections, check the integrity of the closed anti-jump board on the pay-out pulley. After hanging a span of wire, observe whether the relative sag of the two contact lines is excessive. If so, timely adjustments should be made to prevent the two lines from swaying and intersecting during tensioning, causing the contact line to bend. When hanging double lines in reverse positioning in a curve, the positioning device must be tied and fixed to the positioning tube to prevent the pay-off pulley from getting stuck on the positioning device when tightening the line and affecting the work of the pay-off pulley. When the two pay-off reel flatbed trolleys approach the anchor column, use the pulley block to tighten the two contact lines at the same time. Before tightening the line, add a fixed pulley to the end of the pulley block to connect the two tensioners to clamp the two contact lines. When pulling the pulley block manually, pay attention to steady and uniform force. Do not pull the two contact lines too fast or too slow so that the two contact lines shake too much and the line is twisted or the pay-off pulley is off the line. At the same time, a special person should be assigned to observe the state of the pay-off pulley after being stressed during the tightening process, the equal height of the two lines, the torsion of the line surface, and the longitudinal movement of the line at the anchoring and curve. When the tension is uniform and the lowest point of the tension is 300mm to 500mm lower than the designed conductor working height, replace the 6-ton fall chain and tighten the two contact wires to the designed tension. At the same time, observe that the compensation device at the anchor is working properly. Then hang a set of anchoring tools at the anchor drop and connect them to the final anchor clamp 15 of the installed anchor connection component. Then remove all tensioning tools and start installing the center anchor knot of the contact wire. Ensure that the tension and sag of the auxiliary ropes at both ends and the double center anchor knot are consistent. At this time, remove all materials for temporary fixing measures at the anchor drop. After observing that the compensation devices at both ends of the anchor section are not stuck, start installing the positioning device from the middle anchor to the anchor at both ends. Before installing the positioning device, be sure to solve the problems of equal height and equal distance of the two lines, line surface torsion, and excessive pull-out value. Then start measuring the parameters required for the suspension string calculation.

[0066] S3: Fine-tuning of suspension string installation and positioning device: Measure and mark the suspension string installation position on the contact line, install the suspension strings from the middle anchor to the lower anchor, use the double-bearing and double-guide suspension string installation tool to install the suspension strings one by one in the order of number, and then install the nearby pay-out pulley. The suspension string installation tool should be controlled to be between 200mm and 300mm from the installation string position. At the same time, the suspension string installation tool should be used to adjust the suspension string position. After the entire anchor section suspension string is installed, remove the anchoring tool and replace the anchoring connection parts.

[0067] As a specific solution, the installation of the suspension string and fine adjustment of the positioning device include the following steps:

[0068] S31: Measure and mark the installation position of the suspension string;

[0069] Before installing the suspension strings, organize two groups of ladder trucks to measure and mark the installation positions of the suspension strings on the contact line according to the suspension string spacing calculation sheet. When measuring, measure from the center anchor center column to the lower anchor direction (ensure that the distance between the two positioning points of each span is consistent with the first suspension string in the mid-span direction).

[0070] S32: Install the hanging string using a hanging string installation tool;

[0071] After marking the installation position of the suspension strings, the ladder car group installs the suspension strings from the middle anchor to the lower anchor. With the help of the double-bearing and double-guide suspension string installation special tool, the suspension strings are installed one by one in the order of number, and then the nearby pay-out pulley is installed. When installing the suspension strings, the distance between the installation suspension strings is controlled between 200mm and 300mm using special tools. The special tools must not be loosened before the suspension string clamp bolts are tightened (if there is any misalignment, it can be corrected in time with a straightener. When the suspension string is installed to the positioning point, the positioning tube, positioning device slope, positioning support angle, inclined wire position, distance between the two ears of various sleeves, and standard distance between the two positioning clamps can be adjusted into place at one time, including torque and cotter pins as required).

[0072] S33: Replace the anchoring tool with the anchoring connection component;

[0073] After the positioning device and the suspension string are installed and adjusted, use two sets of ladder trucks to first remove the line-paying pulley, and then use the tensioning tool to remove the fixed pulleys at the anchor raising and anchor dropping positions respectively, and replace the upper and lower anchor connection parts.

[0074] Specifically, before installing the suspension strings, two groups of ladder cars are organized to measure and mark the installation positions of the suspension strings on the contact line according to the suspension string spacing calculation sheet. When measuring, measure from the center anchor center column to the lower anchor direction to ensure that the spacing between the two positioning points of each span and the first suspension string in the mid-span direction is consistent. If there is a difference between the actual span and the calculated span, the difference will be evenly distributed in the distance from the second suspension string at the adjacent positioning points of this span to the mid-span. After marking the installation position of the suspension string, the ladder car group starts to install the suspension string from the middle anchor to the lower anchor, and uses the double-bearing double-guide suspension string installation tool to install the suspension strings one by one in the order of number, and then install the nearby pay-out pulley. When installing the suspension string, the distance between the installation suspension string position is controlled between 200mm and 300mm using the double-bearing double-guide suspension string installation tool. The double-bearing double-guide suspension string installation tool must not be loosened before the suspension string clamp bolts are tightened. At the same time, if there is any misalignment between the line and the surface, it can be corrected in time with a straightener. When the suspension string is installed to the positioning point, the positioning tube, positioning device slope, positioning support angle, inclined wire position, distance between the two ears of various sleeves, and standard distance between the two positioning clamps can be adjusted into place at one time, including torque and cotter pin as required. When adjusting the positioning and encountering a curved section, due to the influence of the lateral tension being greater than the vertical gravity, the height difference between the two contact lines is irregular and not parallel to the rail surface. The super-elevation conversion slope method can be used, namely: △′=△+h÷(Π÷180×L) to determine the standard slope required for the actual state of the slope of the positioning device at the curve, so as to solve the problem that the two lines of the curve are not of equal height and cannot be parallel to the rail surface. The △ value (the base value of the slope of the design value of the straight section) can appropriately use the maximum value as the conversion base value. In this way, it can be guaranteed to the greatest extent that the two contact lines of the curved section are parallel to the line connecting the rail plane, and ensure that the pantograph will not be eccentrically worn or only contact one conductor. After the installation of the entire anchor section suspension string is completed, the anchoring tool is removed and the upper and lower anchor connection components are replaced.

[0075] The advantage of carrying out the installation of the suspension strings and the fine adjustment of the positioning device at the same time and combining it with the optimized construction technology is that by setting special anchoring tools with automatic tension balancing function and the function of releasing the self-twisting torsion force of the lines after being stressed or after construction at the two anchor points of the anchor section, the spacing allowance of the two lines from the middle anchor to the lower anchor, the unevenness allowance, the positioning pull-out value, and the unequal distance allowance of the two positioning devices at the head and tail are all balanced and released at the anchor point. Therefore, the four key problems of "double-bearing and double-guiding" equal height of the two lines, inconsistent spacing, unequal tension of the two lines between each suspension string in the equivalent span, and twisting surface of the contact line at the anchor point are fundamentally solved, especially in curved sections where the improvement is most obvious.

[0076] The above-mentioned double-support double-conductor dropper string installation tool is a tool for installing contact line dropper strings. The dropper string installation tool of patent: Contact network double-support double-conductor dropper string installation tool-CN201821990943.3 can be used, and other types of dropper string installation tools can also be used.

[0077] Specifically, after the double-branch contact wire is erected, there is no need to reverse the payout pulley to replace the temporary hanging string. The payout pulley can be installed when the formal hanging string is installed. This simplifies the operation process of reverse the payout pulley to hang the temporary hanging string. When installing the formal hanging string, there is no need to remove the payout pulley. This special tool can be moved between the guides. During the installation of the hanging string, the adjacent payout pulley can be removed after the hanging string is installed. This mainly avoids the situation where the two lines are not parallel and cannot be returned to the normal spacing in advance during the installation of the hanging string, thereby improving the installation efficiency and quality. The effective coordination and adjustment of the operation links and the anchoring tools have been practically verified in the system construction process, and the overall process level has also been improved.

[0078] In order to ensure the smooth implementation of double-bearing and double-conductor contact network construction, the following prerequisites need to be met:

[0079] 1. For the dual-bearing, dual-guide catenary system, the anchoring point must ensure that the tension of both cables can be freely and equally adjusted based on the stresses applied to the cables, whether due to manual manipulation or climatic changes. The operating requirements for the balancing pulley 4 in the anchoring tool must be that it can rotate freely under design conditions, and the bearing damage must be twice the design tension. The diameter of the balancing pulley 4 must not affect the rotation of the two cables (specifically, within the rotation range of the return portion of the double-ear wedge clamp).

[0080] 2. The working part of the rope sleeve used in conjunction with the balance pulley 4 must not have any turning back, and the wire clamp and other structures that affect the winding stroke in the wheel groove of the balance pulley 4, and the tensile strength of the rope 7 must reach 2 times the design tension;

[0081] 3. The double-ended rotator 8 connected to the two sleeves of the wire sleeve must be a built-in bearing rotation type and be able to withstand a tension twice the design tension of the anchor and rotate smoothly after being stressed;

[0082] 4. The D2-type double-joint plate 13, which connects the double-support double-conductor final anchor clamp 15 to the rotator 8, has structural dimensions corresponding to the final anchor clamp 15 and rotator 8, with bolt pins that can match the connection. The main body material meets the strength requirements of the Q235 national standard, and the tensile strength is more than twice the anchor tension.

[0083] As a specific implementation method, CN201821984967.8 "A special tool for hanging and anchoring a double-bearing and double-conducting contact network" is used in the construction method of this patent as follows:

[0084] Part 1: Implementation of the solution in the construction of catenary cables

[0085] ① When the load-bearing cable is erected and anchored, a 3-meter-long ф14mm steel wire sleeve is folded in half and passed through the balance pulley 4. The "U"-shaped ring at one end of the balance pulley 4 is connected to the 6-ton hand-plate fall chain traction hook. The two rings of the folded steel wire sleeve in the balance pulley 4 are connected to the 150-300 German-type tensioner (the tensioner is directly connected when weaving the sleeve) to clamp the double-support force cable. The traction hook on the main working mechanism side of the 6-ton hand-plate fall chain is connected through a 2-meter-long ф14mm steel wire sleeve. After folding it in half, connect it to the anchor compensation device (the balance wheel splint of the ratchet small compensation wheel) to complete the line tightening work. After the line tension reaches the design tension, lift the new type of spiral fixed pulley with a "U"-shaped ring that has been pre-hung at the ratchet balance wheel splint and the complete set of tools to measure the size with the double-support force cable to complete the formal terminal production. When measuring, consider the front and rear size difference of the two branch line terminals. After the formal terminal is completed, connect it to the balance pulley 4, loosen the fall chain and remove the line tightening tool to complete the operation.

[0086] ② When the load-bearing cable is erected and anchored, connect one end of the "U"-shaped ring of the balance pulley 4 to the compensation device (the ratchet wheel compensates the balance wheel clamp); fold the 2-meter steel wire sleeve in half and wrap it around the balance pulley 4, with the two ends 460mm apart from each other, and then clamp it with a steel wire clamp. Connect two rotators 8 and D1-type double plates 11 at the two loops of the steel wire sleeve and connect them to the final anchor clamp 15 of the double-support force cable. At this time, the anchor ratchet wheel is tied to the ratchet bracket with double-strand wire. Finally, check the safety status of all connecting parts. After confirming that there is no problem, start loosening the two wire drums at the same time to string the line.

[0087] Part II: Implementation of the solution in double contact line construction

[0088] ①The connection method of the anchoring tool is consistent with the connection method of the load-bearing cable construction.

[0089] ② When the contact line is erected and anchored, the method of using the anchoring tool is the same as that when the load-bearing cable is erected and anchored.

[0090] General description:

[0091] ① Two sets of anchoring tools are used for each construction of the catenary and contact wire (i.e. one set for anchoring and one for anchoring).

[0092] ② When anchoring the load-bearing cable and the contact line during each construction, since there are many types of line-stringing machinery (i.e., winch, line-string vehicle, manual cart), the tools used to clamp and reach the set tension are also different, but they do not affect the use of anchoring tools.

[0093] The method of this embodiment solves difficult construction problems: ① After the catenary is installed and the payout pulley returns to its original position, the two cables naturally reach the same height. This is particularly evident on curves, overcoming the rigid standard of uneven heights between the two cables, even exceeding a 5mm height difference. This improves accuracy and reduces errors. It also addresses the problem of the catenary, which cannot naturally rotate and release after being twisted several times due to manual payout. ② After the contact wire is installed and the positioning device for the payout pulley is installed, the contact wire surface can be quickly and naturally straightened to its normal state. In particular, the non-working surface of the contact wire at the anchor point can be rotated to its normal state before plastic deformation occurs, ensuring that the compensation device (ratchet compensation wheel balance wheel) does not deflect. Furthermore, it provides better tension balance to address the problem of reverse double-branch unequal heights (i.e., uneven wear between the pantograph and the double-branch contact wire working surface) that occurs when the working surfaces of the two contact wires are not parallel to the rail plane on a curve. Secondly, in terms of improving quality, after the load-bearing cables are erected, the arm offset is adjusted and the positioning device and contact suspension are installed after the contact line is erected, so that the two supporting cables maintain the same height on the straight line and the curve; the two contact lines are at the same height on the straight line; on the curve, the double-branch guide height is parallel to the line connecting the rail planes, and the standard of the height difference between the two lines not exceeding 5mm is further reduced to the range of 1-2mm, thereby improving the quality.

[0094] What is important is that the "double-bearing, double-conducting" contact network construction process is completely different from the "single-bearing, single-conducting" form of construction process. Due to its special structure, the problems presented by the double-bearing, double-conducting are also more complex and diverse. From a technological perspective, research must always focus on the theme of "two-line tension and equal height" to determine the process and method. Each process will affect the occurrence or reduction of this problem. Therefore, solving these problems from a complete set of construction process flows and the use of special tools is the research result of the "double-bearing, double-conducting" construction process and method. It is also a breakthrough in the next construction and maintenance technical difficulties in the professional field of urban rail transit flexible contact network, providing basic conditions for future technical research and development.

[0095] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A contact network double-bearing and double-conducting construction method, characterized in that: The steps include: S1: Installation of Dual Force Cables: Two cables are deployed simultaneously, and anchoring tools are installed at the lifting and dropping anchor points. After dropping anchor, installing the center anchor knot of the force cable, and offsetting and returning the dual force cable cantilever, the anchoring tools at the lifting and dropping anchor points are removed and replaced with anchoring connecting components. Step S1 also includes installing the anchoring tool at the lifting anchor point and temporarily fixing it with a compensation device at the lifting anchor point. When the two force cables are deployed to the horizontal cantilever and the pulley is hung, the two force cables are kept at the same height. S2: Double-branch contact wire installation: The two contact wires are deployed simultaneously. Anchoring tools are installed at the anchoring point, and the anchoring point is temporarily fixed with a compensation device. The tension of the two contact wires is tightened to the rated value using a tensioning tool. Anchoring tools are installed at the anchoring point, and the anchoring tools are connected to the final anchor clamp of the anchor connection component. The tensioning tools are removed and the center anchor knot of the contact wire is installed. Two ladder trucks are used to install the pay-out pulleys from the center anchor knot to the anchoring points at both ends. The positioning device is installed. When replacing the temporary suspension string, make sure that the two wires are suspended at the same height. S3: Installation of suspension strings and fine-tuning of the positioning device: Measure and mark the suspension string installation positions on the contact line, install the suspension strings starting from the middle anchor and working down to the lower anchor, and use the double-bearing, double-guide suspension string installation tool to install the suspension strings one by one. Install the nearby payout pulleys and adjust the suspension string positions using the suspension string installation tool. After the positioning device and suspension string installation are completed, use two ladder trucks to first remove the payout pulleys. Then, use the tensioning tool to remove the fixed pulleys at the anchor raising and anchor dropping locations and replace them with anchor connection components. The anchoring tool has the function of automatically balancing tension and the function of self-twisting torsion force after the release line is stressed or after construction.

2. The contact network double-bearing and double-conducting construction method according to claim 1, characterized in that: Step S1, double-loaded cable installation, also includes the following specific steps: S11: Temporary anchoring of the catenary is completed by using the anchoring tool; After the double-branch cable is deployed to the anchoring position, the tension of the double-branch cable is adjusted to the rated tension value, and the anchoring tool is installed between the compensation device and the end of the cable; S12: Remove the load of the line tightening tool at the anchoring location; After dismantling, install the center anchor knot of the load-bearing cable and turn the compensation device at the anchoring point back into a live anchor; S13: Double-supported cables with equal height; S14: The load-bearing cable is returned to its original position, and the anchoring tool is removed and replaced with the anchoring connection component.

3. The contact network double-bearing and double-conducting construction method according to claim 1, characterized in that: Step S2, double-branch contact line installation, also includes the following specific steps: S21: Temporary anchoring of the catenary is completed by using the anchoring tool; S22: Remove all tensioning tool loads at the anchor drop location; S23: Install the contact wire center anchor.

4. The contact network double-bearing and double-conducting construction method according to claim 1, characterized in that: Step S3: installing the hanging string and fine-tuning the positioning device, including the following specific steps: S31: Measure and mark the installation position of the suspension string; Before installing the hanging strings, organize two teams of ladder trucks to measure and mark the hanging string installation positions on the contact line according to the hanging string spacing calculation sheet. When measuring, measure from the center column of the middle anchor toward the lower anchor. S32: Install the hanging string using a hanging string installation tool; S33: Replace the anchoring tool with the anchoring connection component.

5. The contact network double-bearing and double-conducting construction method according to claim 1, characterized in that: In step S1, during the process of laying out the clues, the straight line segment of the wrist arm fixes the wrist arm at every two suspension points, and the curve of each wrist arm is fixed.

6. The contact network double-bearing and double-conducting construction method according to claim 3, characterized in that: During the installation of the positioning device in step S23, a spacer block is set between the two contact lines when adjusting the pull-out value, and the width of the spacer block is 30 mm.

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