A method for installing and adjusting an expansion joint of a rigid catenary

Abstract

The present invention belongs to the technical field of subway power supply catenary construction, and specifically relates to a method for installing and adjusting a rigid catenary expansion joint. The method includes the following steps: S100: Reserve the installation space for the expansion joint; S200: Grind the busbar to reserve the contact wire end. The busbar ends connected to both ends of the expansion joint must reserve a contact wire with a length of the expansion joint slideway + 300 mm. At the same time, straighten the reserved contact wire without hard kinks. Before installing the expansion joint, cut the reserved contact wire length to the expansion joint slideway length ± 5 mm and grind the contact end into an oblique angle; S300: Install the expansion joint; S400: Install and clamp the contact wire. By using the expansion joint at the anchor section joint of the rigid suspension catenary system, the present invention compensates for the longitudinal expansion or contraction of the busbar in the anchor section due to temperature changes, realizes the electrical continuity between the anchor sections and the smooth transition of the pantograph between the anchor sections.

Description

Technical Field

[0001] The present invention belongs to the technical field of subway power supply catenary construction, and particularly relates to a method for installing and adjusting a rigid catenary expansion joint. Background Art

[0002] The rigid catenary is an important part of the electrified railway and the power source of rail transit vehicles, responsible for providing power to rail locomotives. An anchor section refers to a key part that divides the catenary along the line into certain lengths and has independent mechanical stability in structure, which can narrow the scope of accidents and facilitate maintenance. Currently, the subway rigid catenary usually adopts the anchor section joint mechanical sectioning scheme. However, due to the large installation difficulty of the anchor section joint mechanical sectioning, high arcing rate after the passage of electric multiple units, and poor current collection quality between the pantograph and the catenary, the long-term operation causes great wear to the contact wire and the pantograph. Therefore, a scientific and feasible mechanical sectioning installation method needs to be summarized to ensure stable current collection between the pantograph and the catenary and reduce abnormal arcing. Summary of the Invention

[0003] In order to solve the technical problems of large operation interference, long construction period, and low work efficiency existing in the construction of the existing subway rigid catenary, the present invention provides a method for installing and adjusting a rigid catenary expansion joint.

[0004] The present invention adopts the following technical solutions: A method for installing and adjusting a rigid catenary expansion joint includes the following steps: S100: Reserve the installation space for the expansion joint; S200: Grind the busbar to reserve the contact wire end. The busbar ends connected to both ends of the expansion joint must reserve the contact wire with a length of the expansion joint slideway length + 300 mm. At the same time, straighten the reserved contact wire without hard folding points. Before installing the expansion joint, cut the reserved contact wire length to the expansion joint slideway length ± 5 mm, and grind the contact end into an oblique angle; S300: Install the expansion joint; S400: Install and clamp the contact wire.

[0005] In step S100, at the installation part of the expansion joint, reserve the installation space for the expansion joint in advance between the two busbars at both ends. The length G of the reserved gap is determined according to the "expansion joint installation gap control temperature curve" of the ambient temperature when installing the busbar.

[0006] The expansion joint includes a 500-type expansion joint and a 1000-type expansion joint. For the 500-type expansion joint: G = 1925 mm + 10a; for the 1000-type expansion joint: G = 2725 mm + 10a, where a is the scale value of the expansion joint. For the convenience of adjusting the length of the expansion joint, adjust according to the a value corresponding to the G value, and the deviation shall not be greater than ±20 mm.

[0007] The specific grinding method for step S200 is as follows: S201: Place the end of the contact wire in the contact wire grinding fixture. The inside of the contact wire grinding fixture has a round hole with a diameter larger than the diameter of the contact wire. The end of the contact wire is inserted into the round hole. One side of the contact wire grinding fixture has a notch. A top bolt is inserted through the top of the contact wire grinding fixture, and the bottom of the top bolt fixes the contact wire. At the same time, ensure that the contact wire and the contact wire grinding fixture are symmetric left and right; S202: Use a angle grinder to grind an inclined angle on the end of the contact wire until the inclined angle is finally consistent with the inclined angle of the contact wire grinding fixture; S203: Remove the contact wire grinding fixture and check whether the inclined angle surface of the contact wire is smooth and flat.

[0008] The specific installation method for step S300 is as follows: S301: Adjust the length of the expansion joint to the reserved gap length G and place it in the previously reserved position. At the current ambient temperature, the G value meets the requirements of the "Temperature Curve for Controlling the Installation Clearance of the Expansion Joint", and the deviation does not exceed ±20 mm; S302: Stretch the expansion joint to align it with the end faces of the two busbars; S303: Connect the expansion joint to the two busbars and fix it through the outer wrapping joint to ensure that the expansion joint is closely attached to the two busbars. Alternately tighten the M12 bolts with a tightening torque of 56 N·m.

[0009] The requirements in step S302 are as follows: a. The expansion joint body and the connected busbar must be on the same straight line; b. There should be no twisted surfaces between the two; c. The joint gap should not be greater than 0.5 mm.

[0010] Step S400 includes the following steps: S401: Straighten and adjust the alignment of the contact wire reserved at the expansion joint. Confirm that the end of the contact wire has been ground, and cut the contact wire to the same length as the slideway; S402: Apply conductive grease in the contact wire groove, open the pressure plate of the expansion joint, insert the contact wire smoothly between the body tooth shape and the pressure plate, and tighten the M8 bolts from the end of the busbar to the end of the contact wire.

[0011] Compared with the prior art, by using the expansion joint at the anchor section joint of the rigid catenary system, the present invention compensates for the longitudinal expansion or contraction of the busbar in the anchor section due to temperature changes, realizes the electrical continuity between the anchor sections and the smooth transition of the pantograph between the anchor sections, improves the construction technology of the rigid catenary anchor section joint in China, and achieves good economic and social benefits. Brief Description of the Drawings

[0012] Figure 1 It is the installation schematic diagram of the expansion joint of the present invention;

[0013] Figure 2 It is the schematic diagram of the expansion joint body of the present invention;

[0014] Figure 3 It is the temperature curve graph for controlling the installation clearance of the 500-type expansion joint of the present invention;

[0015] Figure 4 This is the temperature curve graph for controlling the installation clearance of the 1000-type expansion joint of the present invention;

[0016] Figure 5 This is the schematic diagram of the contact wire grinding of the present invention;

[0017] Figure 6 This is the sectional view of the contact wire grinding of the present invention;

[0018] Figure 7 This is the schematic diagram of the installation of the outer wrapping joint for the installation of the expansion joint of the present invention;

[0019] In the figure: 1 - left slideway; 2 - right slideway; 3 - wire pressing clamping plate; 4 - M8 bolt; 5 - M8 flat washer; 6 - M8 spring washer; 7, outer wrapping joint; 8, busbar; 12, rigid suspension point; 13, contact wire grinding fixture; 14, M12 fastening bolt; 15, contact wire; L - distance between two suspension points; G - reserved clearance; h - thickness of contact wire grinding; M - length of contact wire grinding. Detailed implementation manners

[0020] A method for installing and adjusting a rigid catenary expansion joint, as Figures 1-6 shown, includes the following steps:

[0021] S100: Reserve the installation space for the expansion joint.

[0022] (1) The distance between two adjacent rigid suspension points at both ends of the 500-type expansion joint is 3.5 m; the distance between two adjacent rigid suspension points at both ends of the 1000-type expansion joint is 4 m, and the error is not greater than ±100 mm.

[0023] (2) At the installation position of the expansion joint, the installation space for the expansion joint should be reserved in advance between the busbars at both ends. The size G value of the reserved clearance should be determined with reference to the "temperature curve graph for controlling the installation clearance of the expansion joint" according to the ambient temperature when installing the busbar. For the convenience of adjusting the length of the expansion joint, it can be adjusted according to the a value corresponding to the G value, and the deviation shall not be greater than ±20 mm.

[0024] For the 500-type expansion joint: G = 1925 + 10a (a: scale value of the expansion joint);

[0025] For the 1000-type expansion joint: G = 2725 + 10a (a: scale value of the expansion joint).

[0026] S200: Reserve the grinding of the contact wire end of the busbar:

[0027] To effectively ensure the use of the expansion joint, the end of the busbar connected to both ends of the expansion joint must reserve a contact wire with a length of the expansion joint slideway length + 300 mm. At the same time, straighten the reserved contact wire without hard bends. Before installing the expansion joint, cut the length of the reserved contact wire to the expansion joint slideway length ± 5 mm, and grind the contact end into an inclined angle using a special inclined angle grinding auxiliary fixture. The grinding method is as follows:

[0028] S201: As Figure 6 、 7 shown, place the contact wire end in the contact wire grinding fixture 13. The contact wire grinding fixture 13 has a round hole with a diameter larger than the diameter of the contact wire inside. The contact wire end is inserted into the round hole. One side of the contact wire grinding fixture 13 has a notch, and a top bolt 14 is passed through the top of the contact wire grinding fixture 13. The bottom of the top bolt 14 fixes the contact wire, and at the same time, ensure that the contact wire is symmetrical with the contact wire grinding fixture 13 left and right.

[0029] S202: Use an angle grinder to grind the contact wire end into an inclined angle, and the final inclined angle is consistent with the inclined angle of the contact wire grinding fixture 13.

[0030] S203: Disassemble the contact wire grinding fixture 13 and check whether the inclined angle surface of the contact wire is smooth and flat.

[0031] S300: Installation of the expansion joint:

[0032] (1) Adjust the length of the expansion joint to the clearance value dimension G and place it in the previously reserved position (at the current ambient temperature, the G value meets the requirements of the "Expansion Joint Installation Clearance Control Temperature Curve" with a deviation not exceeding ± 20 mm).

[0033] (2) Stretch the expansion joint to align it with the end faces of the busbars at both ends. Requirements:

[0034] a. The expansion joint body and the connected busbar must be on the same straight line;

[0035] b. There should be no twisted surface between the two;

[0036] c. The joint gap shall not be greater than 0.5 mm.

[0037] (3) Connect the expansion joint to the busbars at both ends and fix it through the outer wrapping joint. Ensure that the expansion joint is closely attached to the busbars at both ends, and alternately tighten the M12 bolts with a tightening torque of 56 N·m.

[0038] (4) Precautions for installation

[0039] 1) The four adjacent suspension points of the expansion joint should be at the same height, and the two middle suspension points are allowed to be slightly higher by 1 - 3 mm;

[0040] 2) The center of the length of the outer wrapping joint should be aligned with the joint seam;

[0041] 3) When tightening, the expansion joint should be slightly lifted upward to eliminate the sag caused by its own weight.

[0042] 4) The expansion joint should be installed directly above the central axis of the track at the position where the pull-out value is zero.

[0043] 5) The expansion joint should be installed in front of the confluence discharge line.

[0044] 6) The expansion joint should be installed at the mid-span position, with an allowable error of ±100 mm.

[0045] 7) The G value should meet the requirements of the "Temperature Curve for Controlling the Installation Clearance of Expansion Joints", with a deviation not exceeding ±20 mm.

[0046] S400: Clamping the contact wire:

[0047] (1) Straighten and adjust the alignment of the contact wire reserved at the expansion joint. Confirm that the end of the contact wire has been polished, and cut the contact wire to the same length as the slideway. (Length for 500 type: 1395 mm - 1400 mm; length for 1000 type: 2095 mm - 2100 mm).

[0048] (2) Apply conductive grease in the contact wire groove. Open the pressure plate of the expansion joint, insert the contact wire between the body tooth shape and the pressure plate, and tighten the M8 bolt from the end of the busbar to the end of the contact wire. The tightening torque is 13 N·m.

[0049] Engineering example

[0050] This method is used for the catenary of the entire line of the Beijing New Airport Line and Line 19 of the Beijing Subway. This method is used in the subway power supply system for the first time, effectively reducing the anchor section joint type electrical sectioning. Due to improper installation and adjustment, there are problems such as high arcing rate, poor pantograph-catenary current collection quality, and serious wear of the contact wire and pantograph. At the same time, due to the simple structure of the expansion joint type mechanical sectioning, it is easy to adjust, improving the smoothness of the contact wire at the expansion pipe joint, ensuring the natural and smooth transition of the pantograph at the junction of the two anchor sections, reducing the catenary arcing rate, and greatly improving the operation speed.

[0051] The catenary project of the Beijing New Airport Line was successfully energized in one go for the entire line and passed the completion acceptance smoothly. During more than two years of operation, there were zero accidents at the expansion joints, verifying the safety and reliability of the construction method of the catenary expansion joints. Practice has proved that this technical solution is advanced, highly practical, has good economic and environmental benefits, improves the stability of the construction technology of the rigid catenary expansion joints in subways in China, and has good promotion prospects.

Claims

1. A method for installing and adjusting the expansion joint of a rigid catenary, characterized in that: It includes the following steps, S100: Reserve the installation space for the expansion joint; In step S100, at the installation position of the expansion joint, reserve the installation space for the expansion joint in advance between the two busbars at both ends. The length G of the reserved gap is determined with reference to the "Expansion Joint Installation Gap Control Temperature Curve" according to the ambient temperature when installing the busbar; The expansion joint includes a 500-type expansion joint and a 1000-type expansion joint. For the 500-type expansion joint: G = 1925mm + 10a; for the 1000-type expansion joint: G = 2725mm + 10a, where a is the scale value of the expansion joint. For the convenience of adjusting the length of the expansion joint, adjust according to the a value corresponding to the G value, and the deviation shall not be greater than ±20mm; S200: Grind the reserved contact wire end of the busbar. The end of the busbar connected to both ends of the expansion joint must reserve a contact wire with a length of the expansion joint slideway + 300mm. At the same time, straighten the reserved contact wire, and no hard folding points are allowed. Before installing the expansion joint, cut the length of the reserved contact wire to the expansion joint slideway length ±5mm, and grind the contact end into an inclined angle; S300: Install the expansion joint; S400: Clamp the contact wire.

2. The installation and adjustment method of the rigid catenary expansion joint according to claim 1, characterized in that: The specific grinding method of step S200 is as follows, S201: Place the contact wire end in the contact wire grinding fixture (13). The contact wire grinding fixture (13) has a round hole inside with a diameter larger than the diameter of the contact wire. The contact wire end is inserted into the round hole. One side of the contact wire grinding fixture (13) has a notch. The top of the contact wire grinding fixture (13) is provided with a top bolt (14). The bottom of the top bolt (14) fixes the contact wire, and at the same time ensure that the contact wire is symmetric with the contact wire grinding fixture (13) left and right; S202: Use an angle grinder to grind the contact wire end into an inclined angle, and the final inclined angle is the same as the inclined angle of the contact wire grinding fixture (13); S203: Disassemble the contact wire grinding fixture (13) and check whether the inclined angle surface of the contact wire is smooth and flat.

3. The installation and adjustment method of the rigid catenary expansion joint according to claim 2, characterized in that: The specific installation method of step S300 is as follows, S301: Adjust the length of the expansion joint to the length G of the reserved gap, place it in the previously reserved position. At the current ambient temperature, the G value meets the requirements of the "Expansion Joint Installation Gap Control Temperature Curve", and the deviation does not exceed ±20mm; S302: Stretch the expansion joint to align with the end faces of the two busbars, S303: Connect the expansion joint with the two busbars at both ends and fix it through an outer wrapping joint to ensure that the expansion joint is closely attached to the two busbars at both ends. Alternately tighten the M12 bolts, and the tightening torque is 56N·m.

4. The installation and adjustment method of the rigid catenary expansion joint according to claim 3, characterized in that: The requirements in S302 are: a. The expansion joint body and the connecting busbar must be on the same straight line; b. There shall be no twisted surface between the two; c. The joint gap shall not be greater than 0.5mm.

5. The installation and adjustment method of the rigid catenary expansion joint according to claim 4, characterized in that: The step S400 includes the following steps, S401: Straighten and adjust the line surface of the contact wire reserved at the expansion joint, confirm that the contact wire end has been ground, and cut the contact wire with the same length as the slideway; S402: Apply conductive grease inside the contact wire trough, open the expansion joint pressure clamp (3), insert the contact wire smoothly between the body tooth profile and the pressure clamp, and tighten the M8 bolt (4) from the end of the busbar towards the end of the contact wire.

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