CN112389282A - Construction method for expansion joint of overhead rigid contact network at speed of 160km per hour - Google Patents
Construction method for expansion joint of overhead rigid contact network at speed of 160km per hour Download PDFInfo
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- CN112389282A CN112389282A CN202011287069.9A CN202011287069A CN112389282A CN 112389282 A CN112389282 A CN 112389282A CN 202011287069 A CN202011287069 A CN 202011287069A CN 112389282 A CN112389282 A CN 112389282A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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Abstract
The invention provides a construction method of an expansion joint of an overhead rigid contact network at a speed of 160km per hour, which belongs to the technical field of overhead rigid contact networks of urban rail transit. The method has the advantages of advanced technology, reasonable working procedures and strong practicability, fills the blank of the construction technology of the expansion joint of the overhead rigid contact network with the speed of 160km per hour in urban rail transit in China, and obtains considerable economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of overhead rigid contact networks of urban rail transit, and particularly discloses a construction method of an expansion joint of an overhead rigid contact network at a speed of 160km per hour.
Background
The construction method can directly influence the current receiving quality of the passenger car, and the construction technology of the expansion joint of the overhead rigid contact line with the speed per hour of 160km of urban rail transit in China is still blank at present.
The expansion joint is adopted for electrical through, the bus bars of the anchor sections of two adjacent rigid contact networks can be mechanically and electrically connected, the longitudinal expansion amount or shrinkage amount of the bus bars caused by temperature change is compensated, and when the installation and adjustment of the expansion joint meet the design requirements, the interface position of the contact line of the adjacent anchor sections of the pantograph can be in smooth transition. Because expansion joint self weight characteristic, the expansion joint installation adjustment degree of difficulty is big, and expansion joint can oppress the contact line downwarping of centre gripping at the busbar tip, leads to the contact line to pass through unsmooth easily, the hard spot is big, and when the passenger train passed through, the pantograph took place the striking with the hard spot, and the passenger train current collection quality is not good, appears striking sparks or the phenomenon of drawing an arc. Because the weight of the expansion joint is added to the bus bar at the tail end of the anchor section of the contact network, the line surface of the contact line clamped by the expansion joint is easy to deflect, and when a passenger car passes through the expansion joint, the pantograph and the deflected contact line are mutually abraded, so that the contact line at the position of the expansion joint is subjected to eccentric abrasion.
The construction method provided by the invention can effectively solve the phenomena of ignition, arc discharge, eccentric wear and the like when a passenger car passes through the expansion joint.
Disclosure of Invention
The invention provides a construction method of an expansion joint of an overhead rigid contact line with the speed of 160km per hour, aiming at solving the technical problems that when an existing overhead rigid contact line passenger car with the speed of 160km per hour passes through the expansion joint, ignition or arc discharge occurs between a pantograph and a contact line, and eccentric wear occurs on the contact line.
In order to achieve the aim, the invention provides a construction method of an expansion joint of an overhead rigid contact network with the speed of 160km per hour, which comprises the following steps,
step one, measuring the temperature of the installation environment
Measuring the temperature of an installation environment before construction, and calculating an expansion tensile clearance value and a reserved clearance value of busbars at two ends of an expansion joint;
step two, bus bar arrangement
The expansion joint is arranged between the suspension points of the adjacent anchor sections, the bus bars are symmetrically arranged along the line direction, and the bus bars are reasonably arranged by combining the expansion tensile gap value and the bus bar reserved gap values at the two ends of the expansion joint;
step three, busbar prefabrication
Step four, bus bar installation and adjustment
A. Temporarily fixing a first or second suspension point cantilever at the initial point of the anchor section to serve as a temporary central anchor knot during installation of the busbar;
B. the two ends of the bus bar are simultaneously hoisted, and the bus bar at the side of the non-installed middle joint is kept at the height of the contact line, so that the adjustment of the bus bar in the vertical direction is prevented from being influenced;
C. adjusting the width of the gap between the middle joints at the two sides of the bus bar to be consistent;
D. tightening the middle joint connecting bolt by using a torque wrench according to a specified fastening torque;
E. placing the busbar into a positioning wire clamp clamping groove and fastening by using a hexagon bolt;
F. adjusting the adjacent four suspension points A, B, C, D of the expansion joint to be equal to each other, adjusting the heights and the pull-out values of the bus bars by allowing the middle two suspension points B and C to be within 1mm higher than the outer two suspension points A and D, and adjusting the connecting lines of the mounting points on the two suspension points A and B on one side of the expansion joint and the connecting lines of the mounting points on the two suspension points C and D on the other side of the expansion joint to be parallel;
step five, inspecting the expansion joint product
Checking whether each part of the expansion joint is complete and intact, and putting the expansion joint into use after the product is qualified;
sixthly, installing and adjusting the expansion joint
A. Measuring the span of the bus bars on the suspension points B and C, rechecking, and determining that the mounting and arrangement requirements are met;
B. removing the conductive copper strips at the two ends of the expansion joint;
C. inserting an expansion joint connecting plate into the end parts of the bus bars positioned on the suspension points B and C, and pulling a movable end wire clamp of the expansion joint to adjust an expansion tension gap value;
D. the directions of the two ends of the expansion joint and the side surface connected with the busbar are opposite, each end of the expansion joint is only connected and fixed with a single side surface of the busbar, the expansion joint is fastened by a connecting bolt, the force is gradually applied from small to large during fastening, and the mark line of each fastener is made;
step seven, contact line erection and adjustment
A. The contact wire is embedded into a jaw of the busbar and clamped by advancing the pay-off trolley forwards;
B. contact lines with the length of not less than 2m are reserved at the ends of the bus bars on the suspension points B and C respectively;
C. the contact lines of the bus bar end parts on the suspension point B and the suspension point C are well arranged and are respectively placed into a contact line clamp of the expansion joint, and the contact lines on the two sides are adjusted to be horizontal and equal in height;
D. the end of the broken part of the contact line is bent upwards by 50mm and then cut short;
E. and adjusting the expansion joint, and simulating the bidirectional passing of the pantograph through the expansion joint by using a horizontal ruler to ensure no hard spot and no bowing.
In the first step of the method,
and acquiring an expansion stretching gap value and a busbar reserved gap value at two ends of the expansion joint according to the expansion joint reserved mounting gap control temperature curve.
The third step comprises the steps of,
A. inspecting the surface of the bus bar to ensure that the bus bar can be normally put into use;
B. cutting the bus bars according to the arrangement condition of the bus bars, and checking the cut bus bars, wherein the section of the cut bus bars is not damaged or deflected;
C. the bus bar drilling operation is carried out by using a special drilling die for the bus bar and an electric drill, and the drilling hole position is correct;
D. and the burr edges of the bus bar are filed by using a flat file, so that the contact surface of the bus bar is ensured to be flat and clean.
In the fourth step of the method, the first step of the method,
C. the width of the gaps of the middle joints at the two sides of the bus bar must be smaller than 1 mm;
F. adjusting four adjacent suspension points A, B, C, D of the expansion joint to be equal to each other, allowing the two suspension points B and C in the middle to be within 1mm higher than the two suspension points A and D on the outer side, checking the mounting height of the busbar by using a laser measuring instrument, accurately adjusting the height of the busbar by adjusting bolts through positioning wire clamps, sliding in the vertical line direction of the positioning wire clamps to accurately adjust the pull-out value, enabling the connecting line of the mounting points on the two suspension points A and B on one side of the expansion joint to be parallel to the connecting line of the mounting points on the two suspension points C and D on the other side of the expansion joint, and enabling the vertical distance between the two parallel lines to be.
In the sixth step, the step of,
C. and loosening the fixing bolt of the fixed end wire clamp and the fixing bolt of the movable end wire clamp, inserting the expansion joint connecting plate into the end parts of the busbars on the suspension points B and C, and pulling the movable end wire clamp of the expansion joint to enable the distance between the conductive copper rod between the fixed end wire clamp and the movable end wire clamp to meet the expansion tension gap value.
In the seventh step, the process is carried out,
B. when the contact line is erected, the contact lines at the ends of the bus bars on the suspension point B and the suspension point C are placed into a first contact line clamp of the expansion joint and fixed, the first contact line clamp is the contact line clamp closest to the suspension point B and the suspension point C, and the ends of the two groups of bus bars are respectively reserved with contact lines with the length not less than 2 m;
C. loosening the contact wire clamps of the expansion joint except the first contact wire clamp, adding conductive grease into grooves of the contact wire clamps, arranging the contact wires smoothly, then respectively placing the contact wires into the contact wire clamps on two sides, adjusting the contact wires on the two sides to be horizontal and equal in height, and fastening the contact wires one by one according to the requirement of 25 N.m by using a torque wrench;
D. the end of the broken part of the contact line is cut off after being upwarped by 50mm, and the broken working surface of the contact line is polished into a smooth cambered surface;
E. fine adjustment and inspection are carried out, the pulling values of the expansion joint and the adjacent suspension points are ensured to meet the design requirements, the height is guided to be adjusted to be equal to the height, the bus bar and the expansion joint are adjusted to be horizontal and parallel to the plane of the rail, the horizontal ruler is used for simulating the pantograph to pass through the expansion joint in two directions, and no hard point and no pantograph hitting are ensured.
The invention has the following beneficial effects:
1. in the construction process of an expansion joint of an overhead rigid contact network at the speed of 160km per hour, firstly measuring the temperature of an installation environment, calculating an expansion tension gap value and bus bar reserved gap values at two ends of the expansion joint according to an expansion joint reserved installation gap control temperature curve, perfecting a construction method, improving the working efficiency and the construction precision, and avoiding reworking caused by wrong installation gaps of the bus bar reserved expansion joint;
2. after the contact lines are arranged smoothly, the contact lines are fixed through contact line clamps at the bottoms of the two sides of the expansion joint, so that the allowance is sufficient, stable and reliable, and the compensation of the longitudinal expansion amount of the overhead rigid contact line busbar at the speed of 160km per hour caused by temperature change is met;
3. the directions of the two ends of the expansion joint and the side surface connected with the bus bar are opposite, so that the contact line can be smoothly led into a contact line clamp slot of the expansion joint from the bus bar, the degree that the self weight of the expansion joint presses the contact line to bend and deflect downwards is greatly reduced, the pantograph and the contact line slide well when a passenger car passes through the expansion joint, the problems of ignition, arc discharge, eccentric wear and the like are effectively solved, and the dynamic performance of a pantograph-catenary is improved;
in a word, the technology is advanced, the working procedures are reasonable, the practicability is high, the blank of the construction technology of the expansion joint of the overhead rigid contact network with the speed of 160km per hour in urban rail transit in China is filled, and considerable economic and social benefits are obtained.
Drawings
Fig. 1 is an installation layout diagram of an expansion joint and a busbar in a construction method of the expansion joint of an overhead rigid catenary at a speed of 160km per hour provided by the invention;
fig. 2 is a schematic view of a one-side connection structure of an expansion joint and a busbar in the construction method of the expansion joint of the overhead rigid catenary at the speed of 160km per hour.
Wherein, the names corresponding to the reference numbers are:
1-an expansion joint body; 2-a conductive copper rod; 3-a conductive copper strip; 4-fixing the end clamp; 5, moving the end wire clamp; 6-contact wire clamp; 7-fixing the end clamp fixing bolt; 8-moving the end clamp fixing bolt; 9-contact wire clamp fixing bolt; 10-expansion joint connecting bolt; 11-an expansion joint connection plate; 12-bus bar ends; 13-contact line; 14-suspension point a; 15-suspension point B; 16-suspension point C; 17-suspension point D.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a construction method of an expansion joint of an overhead rigid catenary at a speed of 160km per hour, which comprises the following steps as shown in fig. 1 and 2.
Step one, measuring the temperature of the installation environment
The expansion tensile gap value a of each anchor section expansion joint and the reserved gap value G of the bus bars at two ends of each expansion joint are greatly influenced by the installation environment temperature value T of each section in the tunnel, and the installation environment temperature value T needs to be strictly measured according to a specified flow during construction;
A. measuring a temperature value T of an installation environment, and acquiring an expansion and stretching gap value a according to a reserved installation gap control temperature curve of the expansion joint;
B. and measuring the temperature value T of the installation environment, and acquiring a reserved gap value G of the bus bars at two ends of the expansion joint according to the reserved installation gap control temperature curve of the expansion joint.
Step two, bus bar arrangement
A. The expansion joint is arranged between a suspension point B15 and a suspension point C16 of adjacent anchor segments, and the expansion joint is reasonably arranged according to an expansion tensile gap value a and a busbar reserved gap value G at two ends of the expansion joint under a measured installation environment temperature value T;
B. the bus bars are symmetrically arranged along the line direction, the bus bar arrangement scheme is reasonably planned, a bus bar line arrangement construction drawing is drawn, and detailed information such as suspension point positions, bus bar middle joint positions and bus bar cutting lengths is marked.
Step three, busbar prefabrication
A. The surface of the busbar is checked, and the surface is smooth, flat and clean, has no defects, burrs, stains and corrosion, and has no cracks or pressure fracture;
B. according to a bus bar line arrangement construction drawing, a special bus bar cutting machine is used for cutting off redundant bus bars, an angle ruler is used for checking the cut bus bars, the sections of the cut bus bars and the center lines of the bus bars form 90 degrees, the sections of the whole bus bars are cut smoothly, the requirements of the size deviation of the sections of the bus bars are met, and the sections of the cut bus bars are damaged or deflected and cannot be put into use;
C. after the busbar is cut and reaches the standard, a special drilling mould is sleeved into the end part 12 of the busbar, the regulating bolt of the rotary mould is abutted against the end part 12 of the busbar, the firmness and reliability are realized, then, an electric drill is used for drilling, and the incorrect drilling hole position cannot be used;
D. and (3) filing the burr edge of the bus bar after cutting and drilling by using a flat file, cleaning the residues and ensuring that the contact surface of the bus bar is clean.
Step four, bus bar installation and adjustment
A. Temporarily fixing a cantilever at a first or second suspension point at an initial point of an anchor section, temporarily fixing the cantilever on a suspension post of an adjacent span by adopting a rope, and using the cantilever as a temporary central anchor knot when a busbar is installed;
B. the busbar is hoisted, two ends of the busbar must be hoisted simultaneously in the construction process, but one end cannot be hoisted independently, so that the generation of bending moment is avoided, the busbar on the side of the middle joint which is not installed is kept at the height of the contact line 13, and the busbar is not pulled down to avoid influencing the adjustment of the busbar in the vertical direction;
C. adjusting the width of the gap between the middle joints at the two sides of the bus bar to be consistent and smaller than 1mm, wherein the bus bar is adjusted to be in place, otherwise, the bus bar needs to be subjected to midspan force unloading, and the width of the gap between the middle joints in the bus bar is adjusted until the gap meets the requirement;
D. tightening the middle joint connecting bolt by using a torque wrench according to a specified fastening torque, firstly fastening the connecting bolt close to the middle joint, and then fastening other connecting bolts to ensure that a gap of the middle joint does not have longitudinal movement;
E. opening a side cover of the positioning wire clamp, placing the busbar into a clamping groove of the positioning wire clamp, covering the side cover and fastening the side cover by using a hexagon bolt;
F. before the expansion joint is installed, four adjacent suspension points are adjusted to be equal in height, the positions of the suspension point A14, the suspension point B15, the suspension point C16 and the suspension point D17 are equal in height, the passenger car can pass through smoothly, the suspension joint can droop due to self weight after being installed, but the sag degree is small, so that the middle suspension point B15 and the suspension point C16 are slightly higher than the two suspension points A14 and the suspension point D17 on the outer side, but the installation height of the bus bar is checked by using a laser measuring instrument within 1mm, the height of the bus bar is accurately adjusted by adjusting a bolt through a positioning clamp, the pulling value is accurately adjusted by sliding the positioning clamp in the vertical line direction, the connecting line of the mounting points on the suspension point A14 and the suspension point B15 (namely the position of the AB-side anchor segment bus bar end 12 in the figure) is parallel to the connecting line of the mounting points on the suspension point C16 and the suspension point D17 (namely the position of the CD-side anchor segment bus bar end 12 in the figure), the vertical distance between the two parallel lines is 26mm, so that the flexible movement of each part after the subsequent expansion joint is installed is ensured.
Step five, F.4622.3.100 type rigid suspension expansion joint product inspection
Expansion joint includes two upper and lower sections expansion joint bodies 1 connected through two removal end fastener 5, be provided with stiff end fastener 4 on the expansion joint body 1, the both ends of electrically conductive copper pole 2 are connected with stiff end fastener 4 and removal end fastener 5 respectively through stiff end fastener fixing bolt 7 and removal end fastener fixing bolt 8, expansion joint connecting plate 11 is installed through expansion joint connecting bolt 10 in expansion joint body 1's the outer end, be provided with electrically conductive copper strips 3 on the expansion joint connecting plate 11, be provided with multiunit contact wire clamp 6 on the expansion joint body 1, be provided with contact wire clamp fixing bolt 9 on every group contact wire clamp 6, must inspect before the installation whether each part is complete, whether intact, clean and tidy, whether the cooperation size inspection is in the tolerance range of installation manual regulation, the qualified back of product inspection can be installed.
Sixthly, installing and adjusting the expansion joint
A. Measuring and rechecking span values of hanging points B15 and C16 bus bars at two ends of the expansion joint to ensure that the installation and arrangement requirements are met;
B. the conductive copper strips 3 at the two ends of the expansion joint are removed, and the conductive copper strips 3 are preserved to avoid damage or loss;
C. loosening the fixing bolt 7 of the fixed end clamp and the fixing bolt 8 of the movable end clamp, respectively inserting the expansion joint connecting plate 11 into the anchor segment busbar end 12 of the adjacent anchor segment suspension point B15 and suspension point C16, and pulling the movable end clamp 5 of the expansion joint to enable the distance between the conductive copper rod 2 between the fixed end clamp 4 and the movable end clamp 5 to meet the expansion tension gap value a;
D. the two ends of the expansion joint are opposite to the side surface connected with the bus bar (for example, the left end of the expansion joint is arranged on the front surface of the center line of the left bus bar, and the right end is arranged on the back surface of the center line of the right bus bar), each end of the expansion joint is only fixed with a single side surface of the end part 12 of the bus bar by using an expansion joint connecting bolt 10, so that a contact wire 13 can be smoothly led into a groove of a contact wire clamp 6 from the end part 12 of the bus bar, a conductive copper strip 3 is connected and installed in place with the end part 12 of the bus bar, the expansion joint connecting bolt 10 is connected and fastened in place with the end part 12 of the bus bar by using a torque wrench, and the expansion joint has heavy self weight, so that proper force is applied during;
E. and establishing an equipment installation ledger of each expansion joint, and updating in time.
Step seven, contact line erection and adjustment
A. The paying-off trolley arranged on the bus bar struts a bus bar jaw for clamping the contact wire 13 to the required 9mm by means of an adjusting bolt on the side surface of the paying-off trolley, the paying-off trolley advances forwards, the contact wire 13 is embedded into the jaw of the bus bar and is fastened, and after the paying-off trolley advances for a certain distance, the jaw of the bus bar is restored to the original position;
B. when the contact line 13 is erected, the anchor segment contact lines 13 at two ends of the suspension point B15 and the suspension point C16 are placed into the first contact line clamp 6 at the bottom of two sides of the expansion joint and fixed, and the contact lines 13 with the length not less than 2m are reserved at the end parts 12 of the two busbars respectively;
C. loosening the other eleven contact wire clamp fixing bolts 9 at the bottoms of the two sides of the expansion joint, adding conductive grease into the groove, arranging the contact wires 13 smoothly, then respectively placing the contact wires into the contact wire clamps 6 of the expansion joints at the two sides, adjusting the contact wires 13 at the two sides to be horizontal and equal in height, and fastening one by one according to the requirement of 25 N.m by using a torque wrench;
D. the end of the broken part of the contact line 13 is lifted upwards by 50mm and then cut off to ensure that the pantograph smoothly passes through, and a flat file is used for polishing the broken working surface of the contact line 13 into a smooth cambered surface;
E. fine adjustment and inspection are carried out, the pulling values of the expansion joint and the adjacent suspension points are ensured to meet the design requirements, the height is guided to be adjusted to be equal to the height, the bus bar and the expansion joint are adjusted to be horizontal and parallel to the plane of the rail, the horizontal ruler is used for simulating the pantograph to pass through the expansion joint in two directions, and no hard point and no pantograph hitting are ensured.
Engineering example: the engineering scope of the eighteen-part four-work-area project of track traffic of Guangzhou city and the eighty-two-part of Twenty-two line includes Panyu Guanyu station (including) -Guangzhou Dong station (including), totally 7 stations 6 regions are all underground sections, the line design hourly speed is 160km, the requirement on the adjustment precision of an overhead rigid contact net is very high, for the stability of improving the high-speed running of the passenger car, the bus bar of the contact net in the region does not adopt a non-insulated anchor section joint to carry out electrical connection, but an expansion joint is designed to be used for carrying out electrical through, and the high speed and.
The embodiment is analyzed from the essence and the structure of the expansion joint, and the design and the construction experience of the 160km overhead rigid contact net expansion joint in the project department of the eighteen-division quadruplet work area of track traffic and twenty-two lines in Guangzhou city are combined, so that the method is advanced and reasonable, the construction efficiency and the engineering quality are effectively improved, the construction period is shortened, the cost is reduced, the rework is avoided, the practicability is high, and the technical support can be provided for the expansion joint construction of the 160km overhead rigid contact net at the domestic speed per hour.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A construction method of an expansion joint of an overhead rigid contact network with the speed of 160km per hour is characterized by comprising the following steps,
step one, measuring the temperature of the installation environment
Measuring the temperature of an installation environment before construction, and calculating an expansion tensile clearance value and a reserved clearance value of busbars at two ends of an expansion joint;
step two, bus bar arrangement
The expansion joint is arranged between the suspension points of the adjacent anchor sections, the bus bars are symmetrically arranged along the line direction, and the bus bars are reasonably arranged by combining the expansion tensile gap value and the bus bar reserved gap values at the two ends of the expansion joint;
step three, busbar prefabrication
Step four, bus bar installation and adjustment
A. Temporarily fixing a first or second suspension point cantilever at the initial point of the anchor section to serve as a temporary central anchor knot during installation of the busbar;
B. the two ends of the bus bar are simultaneously hoisted, and the bus bar at the side of the non-installed middle joint is kept at the height of the contact line, so that the adjustment of the bus bar in the vertical direction is prevented from being influenced;
C. adjusting the width of the gap between the middle joints at the two sides of the bus bar to be consistent;
D. tightening the middle joint connecting bolt by using a torque wrench according to a specified fastening torque;
E. placing the busbar into a positioning wire clamp clamping groove and fastening by using a hexagon bolt;
F. adjusting the adjacent four suspension points A, B, C, D of the expansion joint to be equal to each other, adjusting the heights and the pull-out values of the bus bars by allowing the middle two suspension points B and C to be within 1mm higher than the outer two suspension points A and D, and adjusting the connecting lines of the mounting points on the two suspension points A and B on one side of the expansion joint and the connecting lines of the mounting points on the two suspension points C and D on the other side of the expansion joint to be parallel;
step five, inspecting the expansion joint product
Checking whether each part of the expansion joint is complete and intact, and putting the expansion joint into use after the product is qualified;
sixthly, installing and adjusting the expansion joint
A. Measuring the span of the bus bars on the suspension points B and C, rechecking, and determining that the mounting and arrangement requirements are met;
B. removing the conductive copper strips at the two ends of the expansion joint;
C. inserting an expansion joint connecting plate into the end parts of the bus bars positioned on the suspension points B and C, and pulling a movable end wire clamp of the expansion joint to adjust an expansion tension gap value;
D. the directions of the two ends of the expansion joint and the side surface connected with the busbar are opposite, each end of the expansion joint is only connected and fixed with a single side surface of the busbar, the expansion joint is fastened by a connecting bolt, the force is gradually applied from small to large during fastening, and the mark line of each fastener is made;
step seven, contact line erection and adjustment
A. The contact wire is embedded into a jaw of the busbar and clamped by advancing the pay-off trolley forwards;
B. contact lines with the length of not less than 2m are reserved at the ends of the bus bars on the suspension points B and C respectively;
C. the contact lines of the bus bar end parts on the suspension point B and the suspension point C are well arranged and are respectively placed into a contact line clamp of the expansion joint, and the contact lines on the two sides are adjusted to be horizontal and equal in height;
D. the end of the broken part of the contact line is bent upwards by 50mm and then cut short;
E. and adjusting the expansion joint, and simulating the bidirectional passing of the pantograph through the expansion joint by using a horizontal ruler to ensure no hard spot and no bowing.
2. The construction method of the expansion joint of the overhead rigid contact line with the speed of 160km per hour according to claim 1, wherein in the first step,
and acquiring an expansion stretching gap value and a busbar reserved gap value at two ends of the expansion joint according to the expansion joint reserved mounting gap control temperature curve.
3. The construction method of the expansion joint of the overhead rigid catenary at the speed of 160km per hour of claim 1, wherein the third step comprises,
A. inspecting the surface of the bus bar to ensure that the bus bar can be normally put into use;
B. cutting the bus bars according to the arrangement condition of the bus bars, and checking the cut bus bars, wherein the section of the cut bus bars is not damaged or deflected;
C. the bus bar drilling operation is carried out by using a special drilling die for the bus bar and an electric drill, and the drilling hole position is correct;
D. and the burr edges of the bus bar are filed by using a flat file, so that the contact surface of the bus bar is ensured to be flat and clean.
4. The construction method of the expansion joint of the overhead rigid contact line with the speed of 160km per hour according to claim 1, characterized in that in the fourth step,
C. the width of the gaps of the middle joints at the two sides of the bus bar must be smaller than 1 mm;
F. adjusting four adjacent suspension points A, B, C, D of the expansion joint to be equal to each other, allowing the two suspension points B and C in the middle to be within 1mm higher than the two suspension points A and D on the outer side, checking the mounting height of the busbar by using a laser measuring instrument, accurately adjusting the height of the busbar by adjusting bolts through positioning wire clamps, sliding in the vertical line direction of the positioning wire clamps to accurately adjust the pull-out value, enabling the connecting line of the mounting points on the two suspension points A and B on one side of the expansion joint to be parallel to the connecting line of the mounting points on the two suspension points C and D on the other side of the expansion joint, and enabling the vertical distance between the two parallel lines to be.
5. The construction method of the expansion joint of the overhead rigid contact line with the speed of 160km per hour according to claim 1, wherein in the sixth step,
C. and loosening the fixing bolt of the fixed end wire clamp and the fixing bolt of the movable end wire clamp, inserting the expansion joint connecting plate into the end parts of the busbars on the suspension points B and C, and pulling the movable end wire clamp of the expansion joint to enable the distance between the conductive copper rod between the fixed end wire clamp and the movable end wire clamp to meet the expansion tension gap value.
6. The construction method of the expansion joint of the overhead rigid catenary at the speed of 160km per hour of claim 1, wherein in the seventh step,
B. when the contact line is erected, the contact lines at the ends of the bus bars on the suspension point B and the suspension point C are placed into a first contact line clamp of the expansion joint and fixed, the first contact line clamp is the contact line clamp closest to the suspension point B and the suspension point C, and the ends of the two groups of bus bars are respectively reserved with contact lines with the length not less than 2 m;
C. loosening the contact wire clamps of the expansion joint except the first contact wire clamp, adding conductive grease into grooves of the contact wire clamps, arranging the contact wires smoothly, then respectively placing the contact wires into the contact wire clamps on two sides, adjusting the contact wires on the two sides to be horizontal and equal in height, and fastening the contact wires one by one according to the requirement of 25 N.m by using a torque wrench;
D. the end of the broken part of the contact line is cut off after being upwarped by 50mm, and the broken working surface of the contact line is polished into a smooth cambered surface;
E. fine adjustment and inspection are carried out, the pulling values of the expansion joint and the adjacent suspension points are ensured to meet the design requirements, the height is guided to be adjusted to be equal to the height, the bus bar and the expansion joint are adjusted to be horizontal and parallel to the plane of the rail, the horizontal ruler is used for simulating the pantograph to pass through the expansion joint in two directions, and no hard point and no pantograph hitting are ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113415212A (en) * | 2021-08-11 | 2021-09-21 | 中铁二院工程集团有限责任公司 | Continuous seamless rigid contact suspension network system for rail transit and installation method thereof |
| CN114655081A (en) * | 2022-03-28 | 2022-06-24 | 中铁十二局集团电气化工程有限公司 | Articulated electric split-phase construction method for overhead rigid contact network with speed of 160km per hour |
| CN117781878A (en) * | 2024-02-28 | 2024-03-29 | 四川拓及轨道交通设备股份有限公司 | Empty rail contact net state detection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113415212A (en) * | 2021-08-11 | 2021-09-21 | 中铁二院工程集团有限责任公司 | Continuous seamless rigid contact suspension network system for rail transit and installation method thereof |
| CN113415212B (en) * | 2021-08-11 | 2022-07-22 | 中铁二院工程集团有限责任公司 | Continuous seamless rigid contact suspension network system for rail transit and installation method thereof |
| CN114655081A (en) * | 2022-03-28 | 2022-06-24 | 中铁十二局集团电气化工程有限公司 | Articulated electric split-phase construction method for overhead rigid contact network with speed of 160km per hour |
| CN117781878A (en) * | 2024-02-28 | 2024-03-29 | 四川拓及轨道交通设备股份有限公司 | Empty rail contact net state detection method |
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