CN115782702A - Installation and adjustment method for expansion joint of rigid contact network - Google Patents

Abstract

The invention belongs to the technical field of subway power supply contact network construction, and particularly relates to a rigid contact network expansion joint installation and adjustment method. Comprising the following steps, S100: reserving an installation space of the expansion joint; s200: polishing the end of a reserved contact line of the busbar, wherein the end of the busbar connected with two ends of the expansion joint must reserve a contact line with the length of an expansion joint slideway plus 300mm, and simultaneously straightening the reserved contact line without a hard break point, before the expansion joint is installed, cutting off the length of the reserved contact line to the length of the expansion joint slideway plus or minus 5mm, and polishing the contact end into an oblique angle; s300: installing an expansion joint; s400: and (6) installing and clamping the contact wires. The expansion joint is used at the joint of the anchor section of the rigid suspension contact network system, so that the longitudinal expansion amount or contraction amount of the busbar in the anchor section, which is generated due to temperature change, is compensated, and the electric connection between the anchor sections and the smooth transition of the pantograph between the anchor sections are realized.

Description

A method for installation and adjustment of rigid catenary expansion joints

technical field

The invention belongs to the technical field of subway power supply catenary construction, and in particular relates to a method for installing and adjusting a rigid catenary expansion joint.

Background technique

Rigid catenary is an important part of electrified railway, it is the power source of rail transit vehicles, and it is responsible for providing power to rail locomotives. The anchor section refers to the key part that divides the catenary line into a certain length and has independent mechanical stability in structure, which can reduce the scope of accidents and facilitate maintenance. At present, the rigid catenary of the subway usually adopts the anchor section joint mechanical segmentation scheme, but due to the difficulty of installation of the anchor section joint mechanical section, the high arc rate after the electric passenger car passes after installation, and the poor flow quality of the pantograph and catenary, long-term operation is harmful. Contact wires and pantographs wear a lot, so it is necessary to summarize scientific and feasible mechanical segmented installation methods to ensure stable pantograph-catenary current reception and reduce abnormal arcing.

Contents of the invention

In order to solve the technical problems of large operation interference, long construction period and low work efficiency in the existing metro rigid catenary construction, the present invention provides a rigid catenary expansion joint installation and adjustment method.

The present invention adopts the following technical solutions: a method for installing and adjusting rigid catenary expansion joints, including the following steps, S100: reserve space for installation of expansion joints; S200: polish busbar reserved contact wire ends, and connect with both ends of expansion joints At the end of the busbar, a contact line with the length of the expansion joint slideway + 300mm must be reserved. At the same time, the reserved contact line must be straightened to avoid hard folding points. Before installing the expansion joint, cut off the reserved contact line length to the expansion joint The length of the slideway is ±5mm, and the contact end is ground into a bevel; S300: install the expansion joint; S400: install the contact wire.

In step S100, an installation space for the expansion joint is reserved in the middle of the busbars at both ends at the installation position of the expansion joint in advance, and the length G of the reserved gap is determined according to the "expansion joint installation gap control temperature curve" of the ambient temperature when the busbar is installed .

Expansion joints include 500-type expansion joints and 1000-type expansion joints, 500-type expansion joints: G=1925mm+10a, 1000-type expansion joints: G=2725mm+10a, where a is the scale value of the expansion joint scale; for the convenience of expansion joint length adjustment , adjust according to the a value corresponding to the G value, and the deviation shall not be greater than ±20mm.

The specific grinding method of step S200 is as follows, S201: set the contact wire end in the contact wire grinding jig, the contact wire grinding jig has a round hole with a diameter larger than the contact wire diameter inside, the contact wire end is inserted in the round hole, and the contact wire is polished There is a cutout on one side of the fixture, and the top bolt is pierced on the top of the contact wire grinding fixture, and the bottom of the top bolt fixes the contact wire, while ensuring the left and right symmetry between the contact wire and the contact wire grinding fixture; S202: use an angle grinder to grind the end of the contact wire The bevel angle is finally consistent with the bevel angle of the contact line grinding jig; S203: Disassemble the contact line grinding jig, and check whether the bevel surface of the contact line is smooth.

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, and put it in the position reserved in the previous stage. Under the current ambient temperature, the G value meets the requirements of the "expansion joint installation gap control temperature curve" , the deviation does not exceed ±20mm; S302: stretch the expansion joint to align with the end faces of the bus bars at both ends; S303: connect the expansion joint to the bus bars at both ends, and fix it through the outsourcing joint to ensure that the expansion joint is closely attached to the bus bars at both ends. Alternately tighten the M12 bolts with a tightening torque of 56N·m.

Requirements in step S302: a. The body of the expansion joint and the connecting busbar must be on the same straight line; b. There must be no twisted surface between the two; c. The gap between the joints must not be greater than 0.5mm.

Step S400 includes the following steps, S401: Straighten and adjust the surface of the contact line reserved at the expansion joint, confirm that the end of the contact line has been polished, and intercept the contact line with the same length as the slideway; S402: In the contact line Apply conductive grease to the groove, open the clamping plate of the expansion joint, insert the contact wire between the tooth shape of the body and the clamping plate, and fasten the M8 bolts from the end of the busbar to the end of the contact wire.

Compared with the prior art, the present invention uses the expansion joint at the joint of the anchor section of the rigid suspension catenary system to compensate the longitudinal expansion or contraction of the busbar in the anchor section due to temperature changes, and realizes the connection between the anchor sections. The electrical connection and the smooth transition of the pantograph between the anchor sections have improved the construction technology of the anchor section joints of the rigid catenary in my country, and achieved good economic and social benefits.

Description of drawings

Fig. 1 is the installation diagram of expansion joint of the present invention;

Fig. 2 is a schematic diagram of the expansion joint body of the present invention;

Fig. 3 is the temperature curve diagram of the installation gap control of the 500 type expansion joint of the present invention;

Fig. 4 is the temperature curve diagram of the installation gap control of the 1000 type expansion joint of the present invention;

Fig. 5 is a schematic diagram of contact line grinding of the present invention;

Fig. 6 is the grinding sectional view of the contact line of the present invention;

Fig. 7 is a schematic diagram of installation of an outsourcing joint for installation of an expansion joint of the present invention;

In the figure: 1-left slideway; 2-right slideway; 3-crimping splint; 4-M8 bolt; 5-M8 flat gasket; 6-M8 spring washer; 1. Rigid suspension point; 13. Contact wire grinding fixture; 14. M12 fastening bolt; 15 Contact wire; L- distance between two suspension points; G- reserved gap; h- contact wire grinding thickness; M- contact wire grinding length.

Detailed ways

A method for installing and adjusting rigid catenary expansion joints, as shown in Figures 1-6, includes the following steps:

S100: Reserve space for expansion joint installation.

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

(2) At the installation position of the expansion joint, an installation space for the expansion joint should be reserved in the middle of the busbars at both ends in advance, and the reserved gap size G value should be based on the ambient temperature when the busbar is installed. Refer to the "expansion joint installation gap control temperature curve "Confirmed, in order to facilitate the adjustment of the expansion joint length, it can be adjusted according to the a value corresponding to the G value, and the deviation shall not be greater than ±20mm.

500 type expansion joint: G=1925+10a (a: expansion joint scale scale value);

1000 type expansion joint: G=2725+10a (a: expansion joint scale scale value).

S200: Grinding of the end of the reserved contact wire of the busbar:

In order to effectively ensure the use of the expansion joint, the end of the bus bar connected to both ends of the expansion joint must reserve a contact line with a slideway length of the expansion joint + 300mm. Before installing the expansion joint, cut off the length of the reserved contact line to the length of the expansion joint slideway ±5mm, and grind the contact end into a bevel, using a special bevel grinding auxiliary fixture, and the grinding method is as follows:

S201: As shown in Figures 6 and 7, set the contact wire end in the contact wire grinding jig 13, the contact wire grinding jig 13 has a round hole with a diameter larger than the contact wire diameter inside, and the contact wire end is inserted into the round hole, One side of the contact wire grinding jig 13 has a cutout, and the top of the contact wire grinding jig 13 is pierced with a top bolt 14, and the bottom of the top bolt 14 fixes the contact wire, while ensuring that the contact wire and the contact wire grinding jig 13 are left-right symmetrical.

S202: Use an angle grinder to grind the bevel angle of the end of the contact wire, and the bevel angle is finally consistent with the bevel angle of the contact wire grinding jig 13 .

S203: Disassemble the contact wire grinding jig 13, and check whether the beveled surface of the contact wire is smooth.

S300: Expansion joint installation:

(1) Adjust the length of the expansion joint to the gap value dimension G, and put it in the position reserved in the early stage (under 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).

(2) The tensile expansion joint is aligned with the end faces of the busbars at both ends, requiring:

a. The expansion joint body and the connecting busbar must be on the same straight line;

b. The two shall not be twisted;

c. Joint gap shall not be greater than 0.5mm.

(3) Butt the expansion joint with the busbars at both ends, and fix it through the outsourcing joint. Ensure that the expansion joints are closely attached to the bus bars at both ends, and alternately tighten the M12 bolts with a tightening torque of 56N·m.

(4) Precautions for installation

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

2) The length center of the outsourcing joint should be aligned with the seam;

3) When tightening, the expansion joint should be lifted up slightly to eliminate the sag caused by its own weight;

4) The expansion joint should be installed directly above the central axis of the track, where the pull-out value is zero;

5) The expansion joint should be installed before the confluence discharge line;

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

7) The G value should meet the requirements of "expansion joint installation gap control temperature curve", and the deviation should not exceed ±20mm.

S400: Card-mounted contact wire:

(1) Straighten and adjust the surface of the contact line reserved at the expansion joint, confirm that the end of the contact line has been polished, and intercept the contact line at the same length as the slideway. (The length of the 500 type is 1395mm~1400mm; the length of the 1000 type is 2095mm~2100mm).

(2) Apply conductive grease in the contact line groove, open the expansion joint crimping splint, insert the contact line between the body tooth shape and the crimping splint, tighten the M8 bolts from the end of the busbar to the end of the contact wire, Tightening torque 13N.m.

Engineering example

This method is used in the catenary of Beijing Metro New Airport Line and Line 19. This method is used for the first time in the subway power supply system, which effectively reduces the problem of the joint electric segment of the anchor section. Due to the improper installation and adjustment, the arc rate is high, the pantograph-catenary current quality is poor, and the contact wire and pantograph are seriously worn. At the same time, due to the simple structure of the expansion joint mechanical section, it is easy to adjust, which improves the smoothness of the contact line at the expansion joint, ensures the natural and smooth transition of the pantograph at the junction of the two anchor sections, reduces the arcing rate of the catenary, and greatly Increased speed of operation.

The catenary project of the new airport line of the Beijing Metro was successfully transmitted to the whole line at one time, and passed the completion acceptance. During more than two years of operation, there was no accident at the expansion contact point, which verified the safety and reliability of the construction method of the catenary expansion joint. Practice has proved that this technical solution is advanced, practical, economical and environmentally friendly, and has improved the stability of the construction technology of my country's subway rigid catenary expansion joints, and has a good promotion prospect.

Claims (7)

1. A method for installing and adjusting an expansion joint of a rigid contact network is characterized by comprising the following steps: comprises the following steps of (a) preparing a solution,

s100: reserving an installation space of the expansion joint;

s200: polishing the end of a reserved contact line of a busbar, wherein the length of a slide way of the expansion joint plus 300mm of the contact line must be reserved at the end of the busbar connected with the two ends of the expansion joint, straightening the reserved contact line without a hard break point, cutting off the length of the reserved contact line to +/-5 mm of the length of the slide way of the expansion joint before the expansion joint is installed, and polishing the contact end into an oblique angle;

s300: installing an expansion joint;

s400: and (6) installing the contact wire.

2. The method for installing and adjusting the expansion joint of the rigid catenary as claimed in claim 1, wherein the method comprises the following steps: in the step S100, an installation space of the expansion joint is reserved in advance between the busbars at both ends at the installation position of the expansion joint, and the length G of the reserved gap is determined by referring to the "expansion joint installation gap control temperature curve" according to the ambient temperature when the busbars are installed.

3. The method for installing and adjusting the expansion joint of the rigid catenary as claimed in claim 2, wherein the method comprises the following steps: the expansion joint comprises a 500 type expansion joint and a 1000 type expansion joint, wherein the 500 type expansion joint comprises: g =1925mm +10a,1000 type expansion joint: g =2725mm +10a, wherein a is an expansion joint scale value; in order to facilitate the length adjustment of the expansion joint, the adjustment is carried out according to the value a corresponding to the value G, and the deviation is not more than +/-20 mm.

4. The method for installing and adjusting the expansion joint of the rigid contact network according to claim 1, wherein the method comprises the following steps: the specific polishing method of step S200 is as follows,

s201: arranging a contact line end in a contact line polishing clamp (13), wherein a round hole with the diameter larger than that of a contact line is formed in the contact line polishing clamp (13), the contact line end is inserted into the round hole, a notch is formed in one side of the contact line polishing clamp (13), a top bolt (14) is arranged at the top of the contact line polishing clamp (13) in a penetrating mode, the contact line is fixed at the bottom of the top bolt (14), and the contact line polishing clamp (13) are guaranteed to be symmetrical left and right;

s202: an angle grinder is adopted to grind the oblique angle of the end of the contact line, and the oblique angle is finally consistent with the oblique angle of the contact line grinding clamp (13);

s203: and disassembling the contact wire polishing clamp (13) and checking whether the oblique angle surface of the contact wire is smooth and flat.

5. The method for installing and adjusting the expansion joint of the rigid catenary as claimed in claim 3, wherein the method comprises the following steps: the specific installation method of step S300 is as follows,

s301: adjusting the length of the expansion joint to the length G of the reserved gap, placing the expansion joint in an early-stage reserved position, wherein the value G meets the requirement of 'an expansion joint installation gap control temperature curve' at the current environment temperature, and the deviation does not exceed +/-20 mm;

s302: the tensile expansion joint is aligned with the end faces of the bus bars at the two ends,

s303: the expansion joint is butted with the busbars at two ends and fixed through the outer covering joint, so that the expansion joint is tightly attached to the busbars at two ends, the M12 bolts are fastened alternately, and the fastening torque is 56 N.m.

6. The method for installing and adjusting the expansion joint of the rigid contact network according to claim 5, wherein the method comprises the following steps: in step S302, it is required to: a. the expansion joint body and the connecting bus bar are necessarily in the same straight line; b. the two should not be twisted; c. the joint gap should not be larger than 0.5mm.

7. The method for installing and adjusting the expansion joint of the rigid contact network as claimed in claim 6, wherein the method comprises the following steps: the step S400 includes the following steps,

s401: straightening and line surface aligning the contact line reserved at the expansion joint, confirming that the end of the contact line is polished, and intercepting the contact line with the same length as the slideway;

s402: conductive grease is smeared in the contact line slot, the expansion joint line pressing clamp plate (3) is opened, the contact line is inserted between the tooth shape of the body and the line pressing clamp plate, and an M8 bolt (4) is fastened from the end of the busbar to the tail end of the contact line.

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