CN113511112A - Construction structure and method for simultaneously connecting double-circuit contact networks - Google Patents
Construction structure and method for simultaneously connecting double-circuit contact networks Download PDFInfo
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- CN113511112A CN113511112A CN202110669245.3A CN202110669245A CN113511112A CN 113511112 A CN113511112 A CN 113511112A CN 202110669245 A CN202110669245 A CN 202110669245A CN 113511112 A CN113511112 A CN 113511112A
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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
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- B60M1/28—Manufacturing or repairing trolley lines
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Abstract
The invention provides a construction structure and a construction method for simultaneously dialing and connecting contact networks of existing double lines. The construction structure comprises a plurality of contact net support structures distributed along a straight line, a positioning line parallel to the positive feeder line and a catenary cable, wherein each contact net support structure comprises a base, a support column, a flat cantilever, an inclined cantilever and a branch mechanism; during construction, each contact network support is independently constructed according to positioning, and specifically the construction of a base and a support, the installation of an inclined cantilever and a flat cantilever and the installation of a branching device are included, the branching device is respectively connected with a positive feeder and an auxiliary feeder through two support rods, and the two support rods are respectively connected with the inclined cantilever through positioning rods; the positioning line is suspended below the carrier cable through a plurality of hanging strings and is respectively connected with the positive feeder line and the auxiliary feeder line through a plurality of line connecting devices. According to the invention, the double-line construction is carried out on the support rod, the contact network does not need to be subjected to incremental auxiliary feeder line replacement and transformation in the later use, and the upper limit of the power distribution capacity of the contact network in the high-flow train communication is improved.
Description
Technical Field
The invention relates to the field of railway electrical engineering contact net construction methods, in particular to a construction structure and a construction method for simultaneously poking and connecting contact nets by using existing double lines.
Background
With the rapid development of railways in China, in large-scale railway construction, particularly in existing line reconstruction, two lines can be frequently connected in a simultaneous dialing mode, a parallel auxiliary feeder is added for a traffic line with large passenger flow capacity to improve the current carrying capacity of the whole contact system, the train current receiving requirement in a high-traffic-density period is met, compared with a single-bearing single-conductor suspension mode, the bow net contact resistance is reduced by half, and the contact line abrasion can be effectively reduced. When a double-bearing double-guide suspension mode is adopted, compared with a single-bearing single-guide mode, when a certain contact line is separated from a pantograph due to vibration, and the other contact line can still be contacted with the pantograph, the arc discharge phenomenon can not occur at the moment, so that the probability of the occurrence of electric arcs is reduced, and the damage of the contact line is reduced.
Disclosure of Invention
The invention aims to provide a construction structure and a construction method for simultaneously dialing and connecting a contact network with double lines, wherein the construction structure and the construction method are used for constructing the double lines from a support rod, so that the stability between a positive feeder line and an auxiliary feeder line can be ensured, the replacement and transformation of an incremental auxiliary feeder line are not needed in later use, the upper limit of the power distribution capacity of the contact network in high-flow train communication can be improved, the engineering quality is ensured, and the complicated construction is simplified.
In order to solve the technical problem, the invention provides a construction structure for simultaneously dialing and connecting a contact network by using a double-line. The construction structure comprises a plurality of contact net support structures distributed along a straight line, each contact net support structure comprises a base, a support column, a flat cantilever and an inclined cantilever, one ends of the flat cantilever and the inclined cantilever are respectively connected with the support columns through insulators, and the other end of the inclined cantilever is supported at the lower end of the front portion of the flat cantilever, and is characterized in that: the construction structure further comprises a rod splitting mechanism arranged at the front end of the flat wrist arm of each contact net support, and a positioning line and a catenary parallel to the positive feeder line, wherein the rod splitting mechanism comprises a rod splitter, a first line of support rods, a second line of support rods, a first positioning rod and a second positioning rod; the upper part of the front end of the flat cantilever of each contact net support structure is provided with a carrier cable seat, the carrier cables are sequentially fixed on the carrier cable seat at the front end of the flat cantilever of each contact net support structure, a positioning line is suspended below the carrier cables through a plurality of suspension strings and is positioned above the positive feeder line and the auxiliary feeder line, the positioning line is respectively connected with the positive feeder line and the auxiliary feeder line through a plurality of line connecting devices, and a line fork is arranged between the positive feeder line and the auxiliary feeder line.
The invention has the following excellent technical scheme: at least one supporting rod is respectively arranged between the first positioning rod and the second positioning rod and between the wrist-leveling arm and the wrist-leveling arm.
The invention has the following excellent technical scheme: the embedded parts are arranged in the support columns, the inclined cantilever is a single-lug cantilever, and the insulator ends of the flat cantilever and the inclined cantilever are connected with the embedded parts in the support columns through bolts respectively.
The invention has the following excellent technical scheme: the rod splitting device comprises a base fixed on the flat cantilever and two connecting plates symmetrically arranged on the base, the upper ends of the first line of supporting rod and the second line of supporting rod are respectively connected with the two connecting plates, and a positive feeder line threading hole and an auxiliary feeder line threading hole are formed in the bottoms of the first line of supporting rod and the second line of supporting rod; the positive feeder line and the auxiliary feeder line respectively penetrate through the corresponding positive feeder line threading hole and the auxiliary feeder line threading hole.
The invention has the following excellent technical scheme: the first positioning rod and the second positioning rod are parallel to the flat cantilever, one end of the first positioning rod and the second positioning rod are fixedly connected to the middle of the inclined cantilever through bolts, and the other end of the first positioning rod and the second positioning rod are respectively connected to the middle of the first line supporting rod and the second line supporting rod.
The invention has the following excellent technical scheme: the positioning line is arranged in the middle of the gap between the first line supporting rod and the second line supporting rod; the multiple line connecting devices are distributed at equal intervals of 60-90 m, each line connecting device comprises a line clamp fixed on a positioning line and two groups of supporting rods or supporting frames connected to the line clamp, threading holes are formed in the bottoms of the supporting rods or the supporting frames, and the positive feeder line and the auxiliary feeder line penetrate through the threading holes in the bottoms of the two groups of supporting rods or the supporting frames respectively.
In order to achieve the technical purpose, the invention also provides a construction method for simultaneously dialing up the contact network of the existing double lines, which is characterized by comprising the following steps:
(1) positioning the mounting position of each contact net support structure according to a design drawing, and making construction preparation work to prepare equipment and construction materials required by construction; the distance between every two adjacent contact net support structures is 40-60 m;
(2) constructing each contact net support structure in sequence; the construction process of each contact net support structure is as follows:
a. constructing a base and a strut of the contact net support structure, and positioning and embedding embedded parts in the strut through steel bars or steel wires when pouring strut concrete;
b. the cantilever of the contact net support structure is installed: the cantilever comprises a flat cantilever arranged at the top of the support column and a single-lug cantilever arranged below the flat cantilever, insulators are arranged at one ends of the flat cantilever and the single-lug cantilever, the end, provided with the insulators, of the flat cantilever is connected with the embedded part in the support column through bolts, the other end of the flat cantilever horizontally extends out of the outer wall of the support column, the end, provided with the insulators, of the single-lug cantilever is connected with the embedded part in the support column through bolts, and the other end of the single-lug cantilever extends out of the support column in an inclined shape and is fixedly connected with the outer wall of the flat cantilever through a connecting piece;
c. the branch rod of the contact net support structure is installed: a branch device is arranged below the front end of the connecting part of the flat cantilever and the single-ear cantilever, and the mounting mode of the support rod is initially divided into a branch type mounting mode through the branch device, namely a first-line support rod and a second-line support rod, and a positive feeder line and an auxiliary feeder line are respectively fixed at the lower ends of the first-line support rod and the second-line support rod;
d. installing a positioning rod of a contact net support structure: the first line supporting rod and the second line supporting rod are respectively connected with the single-lug wrist arm through a first positioning rod and a second positioning rod, and the first positioning rod and the second positioning rod are parallel to the flat wrist arm;
(3) installation of the auxiliary stabilizing device: after the construction of the contact net support structure is completed, a messenger wire seat is fixedly arranged at the upper end of the front part of the flat cantilever of each contact net support structure, and a messenger wire penetrates through the middle part of the messenger wire seat; a positioning line penetrates through the middle part of a gap between a first line support rod and a second line support rod of each contact net support structure, the positioning line is arranged above the positive feeder line and the auxiliary feeder line, and line connectors are fixedly arranged on the positioning line and the outer walls of the positive feeder line and the auxiliary feeder line at intervals of 60-90 m and are connected with the positive feeder line and the auxiliary feeder line through the line connectors; a dropper is fixedly connected between the carrier cable and the positioning line at intervals, and a line fork is fixedly installed on the outer wall between the positive feeder line and the auxiliary feeder line at intervals;
(4) and (3) simulating cold slip detection: performing cold slip detection in an effective range of an on-line switch by using a zero-time pantograph on the operation ladder car, and timely correcting detected data;
(5) and (3) electrifying the test vehicle for test run: the current trend of the whole device is detected by adopting related equipment, and a detection vehicle is used for effectively detecting a contact net of an upper line, so that potential safety hazards are eliminated, and the related equipment is effectively protected.
The invention has the following excellent technical scheme: the positioning of the contact net support structure in the step (1) is specifically to mark the position of the center of a strut of the contact net at a designed point position by using a steel chisel and a timber pile after the foundation surface engineering of the roadbed is completed; the preparation work before the construction comprises the following steps: the concrete mixing and proportioning work of the machine is made in advance, the technical completion is carried out for corresponding staff responsible persons, and the safety and the method for well arranging the power are achieved.
The invention has the following excellent technical scheme: the construction steps of the base and the support in the step a of the step (2) sequentially comprise: the drilling method comprises the steps of drilling a steel reinforcement cage embedding hole, embedding a steel reinforcement cage of a base and a support, supporting the base and the support, installing an embedded part, pouring a column body and pouring the base, moving a movable drilling machine to a drilling tail hole when the steel reinforcement cage embedding hole is drilled, wherein the drilling tail deviation is less than or equal to two centimeters, drilling a drill bit perpendicular to the ground, measuring the diameter, the depth and the verticality of the hole after the hole is drilled, and timely and effectively cleaning the loose soil at the bottom of the pile.
The invention has the following excellent technical scheme: a gasket is arranged between the rod separator and the flat cantilever in the step (2) c; and (d) in the step (2), the first positioning rod and the second positioning rod are fixedly connected with the wrist leveling arm through at least one supporting rod.
Compared with the prior art, the invention has the beneficial effects that:
the double-line construction method is used for constructing double lines from the supporting rod, the adopted rod splitter can be effectively connected with the first-line supporting rod and the second-line supporting rod to install and maintain the positive feeder line and the auxiliary feeder line, the stability between the positive feeder line and the auxiliary feeder line is maintained through the positioning line, the connecting line, the hanger and the line fork, the contact net does not need to be changed and transformed through incremental auxiliary feeder line in later use, the upper limit of the electric power distribution capacity of the contact net in high-flow train communication is improved, the complicated construction mode is simplified, and the high-efficiency simplification can be realized while the engineering quality is ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the connection of a single catenary bracket structure to a catenary of the present invention;
figure 3 is a schematic view of a single catenary stent structure of the present invention.
FIG. 4 is a flow chart of the construction process of the present invention.
In the figure: the cable comprises a base 1, a support 2, a support column 200, an embedded part 3, an insulator 4, a flat cantilever 5, a tilted cantilever 6, a positioning line 7, a rod divider 8, a line support rod 800, a positive feeder line threading hole 9, a line support rod 900, an auxiliary feeder line threading hole 10, a positive feeder line 11, an auxiliary feeder line 12, a carrier cable 13, a first positioning rod 14, a second positioning rod 14, a carrier cable seat 15, a hanger 16, a connector 17, a line fork 18 and a support rod 19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. The components not specifically described in the present invention are conventional components, or may be implemented in a manner that is conventionally implemented by those skilled in the art, and may be implemented by using the conventional techniques, so that they need not be specifically explained.
The main construction process of the invention is shown in figure 4, and comprises the steps of construction preparation work, positioning and building of a contact net support, installation of a cantilever (comprising a flat cantilever and an inclined cantilever), installation of a branch rod (comprising a branch rod device and two branch supporting rods), installation of a positioning rod, installation of an auxiliary stabilizing device (comprising installation of a catenary cable and a positioning line), simulation of cold slip detection, and test car electrification and test car test in sequence.
The construction structure for simultaneously dialing and connecting the overhead lines of the existing double-line system comprises a plurality of overhead line system support structures distributed along a straight line, as shown in fig. 1 to 3, each overhead line system support structure comprises a base 1, a support column 2, a flat cantilever 4 and an inclined cantilever 5, one end of each of the flat cantilever 4 and the inclined cantilever 5 is connected with the support column 2 through an insulator 3, the other end of the inclined cantilever 5 is supported at the lower end of the front portion of the flat cantilever 4, an embedded part 200 is arranged in the support column 2, the inclined cantilever 5 is a single-lug cantilever, and the insulator ends of the flat cantilever 4 and the inclined cantilever 5 are connected with the embedded part 200 in the support column 2 through bolts.
In the embodiment, the construction structure for simultaneously dialing and connecting the existing double lines to the overhead line system further comprises a rod splitting mechanism arranged at the front end of a flat cantilever 4 of each overhead line system bracket, a positioning line 6 parallel to a positive feeder line 10 and a catenary cable 12, as shown in fig. 2 and 3, wherein the rod splitting mechanism comprises a rod splitter 7, a line supporting rod 8, a line supporting rod 9, a first positioning rod 13 and a second positioning rod 14; the pole separator 7 is of a common structure and mainly plays roles of positioning, supporting, connecting, fixing and hanging protection, the pole separator 7 is fixedly arranged at the lower part of the front end of the flat cantilever 4 and comprises a base fixed on the flat cantilever 4 and two connecting plates symmetrically arranged on the base, the upper ends of the first line of supporting rod 8 and the second line of supporting rod 9 are respectively and fixedly connected with the two connecting plates, and the bottoms of the first line of supporting rod 8 and the second line of supporting rod 9 are provided with a positive feeder line threading hole 800 and an auxiliary feeder line threading hole 900; the positive feeder line 10 and the auxiliary feeder line 11 respectively pass through the corresponding positive feeder line threading hole 800 and the auxiliary feeder line threading hole 900. The first positioning rod 13 and the second positioning rod 14 are both parallel to the flat cantilever 4, one end of each positioning rod is fixedly connected to the middle of the inclined cantilever 5 through a bolt, the other end of each positioning rod is respectively connected to the middle of the first line supporting rod 8 and the second line supporting rod 9, and a supporting rod 19 is respectively arranged between each positioning rod 13 and the flat cantilever 4 and between each second positioning rod 14 and the flat cantilever 4; the support rods 19 of the first positioning rod 13 and the second positioning rod 14 are connected with the wrist-laying arm 4 through the same connecting seat. The upper part of the front end of the flat cantilever 4 of each contact net support structure is provided with a carrier cable seat 15, the carrier cable 12 is sequentially fixed on the carrier cable seat 15 at the front end of the flat cantilever 4 of each contact net support structure, the positioning line 6 is suspended below the carrier cable 12 and above the positive feeder line 10 and the auxiliary feeder line 11 through a plurality of suspension strings 16, the positioning line 6 is respectively connected with the positive feeder line 10 and the auxiliary feeder line 11 through a plurality of line connectors 17, each line connector 17 comprises a line clamp fixed on the positioning line and two groups of supporting rods or supporting frames connected to the line clamp, the bottom of each supporting rod or supporting frame is provided with a threading hole, and the positive feeder line 10 and the auxiliary feeder line 11 respectively penetrate through the threading holes at the bottom of the two groups of supporting rods or supporting frames. A line fork 18 is arranged between the positive feeder line 10 and the auxiliary feeder line 11. The locating wire 6 is arranged in the middle of a gap between the two line supporting rods 9 and 8, and the multiple line connecting devices 17 are distributed at equal intervals of 60-90 m.
The construction method of the invention is further explained by combining specific implementation, and the construction method of the invention aims at the construction of the existing double-line simultaneous dial-up contact network of a certain project, and the specific construction steps are as follows:
(1) positioning the mounting position of each contact net support structure according to a design drawing, wherein the maximum distance between every two adjacent contact net support structures is not more than 60 meters, the minimum distance is 40 meters, the mounting positions are set according to the environment, the distances between any two contact net support structures are not equal, and the length difference of each adjacent interval is not more than 10 meters; after the foundation surface engineering of the roadbed is finished, marking the position of the center of a strut of a contact net at a designed point position by using a steel chisel and a timber pile, so that alignment and inspection can be conveniently carried out in the construction process later, concrete stirring and proportioning work of a machine is done in advance, technical settlement is carried out on corresponding staff responsible persons, safety and methods for arranging power utilization are arranged, and corresponding construction machines and materials are prepared in advance;
(2) each contact network support structure is sequentially constructed according to the sequence, and a plurality of contact network support structures can be simultaneously constructed according to the construction requirement; the construction process of each contact net support structure is as follows:
a. constructing a base 1 and a support post 2 of a support structure of the contact network, and positioning and embedding an embedded part 200 in the support post through a steel bar or a steel wire when pouring the concrete of the support post; the construction steps of the base 1 and the support column 2 sequentially comprise: the drilling method comprises the steps of drilling a steel reinforcement cage embedding hole, embedding a steel reinforcement cage of a base and a support, supporting the base and the support, installing an embedded part, pouring a column body and pouring the base, moving a movable drilling machine to a drilling tail hole when the steel reinforcement cage embedding hole is drilled, wherein the drilling tail deviation is less than or equal to two centimeters, drilling a drill bit perpendicular to the ground, measuring the diameter, the depth and the verticality of the hole after the hole is drilled, and timely and effectively cleaning the loose soil at the bottom of the pile.
b. The cantilever of the contact net support structure is installed: the cantilever comprises a flat cantilever 4 arranged at the top of the pillar and a single-lug inclined cantilever 5 arranged below the flat cantilever, insulators are arranged at one ends of the flat cantilever 4 and the single-lug inclined cantilever 5, the end, provided with the insulators, of the flat cantilever 4 is connected with the embedded part in the pillar through bolts, the other end of the flat cantilever 4 horizontally extends out of the outer wall of the pillar, the end, provided with the insulators, of the single-lug inclined cantilever 5 is connected with the embedded part 200 in the pillar through bolts, and the other end of the single-lug inclined cantilever extends out of the pillar 2 in an inclined manner and is fixedly connected with the outer wall of the flat cantilever 4 through a connecting piece;
c. the branch rod of the contact net support structure is installed: a rod separator 7 is arranged below the front end of the connecting part of the flat cantilever 4 and the single-ear inclined cantilever 5, and the rod separator 7 is a common structure, is positioned and supported, and plays roles of connection, fixation and suspension protection; the mounting mode of the support rod is divided into a split rod type mounting mode at the initial mounting through the rod splitter 7, the split rod type mounting mode comprises a first line support rod 8 and a second line support rod 9, and a positive feeder line 10 and an auxiliary feeder line 11 are respectively fixed at the lower ends of the first line support rod 8 and the second line support rod 9; a gasket is arranged between the rod separator 7 and the flat cantilever 4;
d. installing a positioning rod of a contact net support structure: the first line supporting rod 8 and the second line supporting rod 9 are respectively connected with the monaural inclined wrist arm 5 through a first positioning rod 13 and a second positioning rod 14, and the first positioning rod 13 and the second positioning rod 14 are both parallel to the flat wrist arm 4; and is fixedly connected between the first positioning rod 13 and the second positioning rod 14 and the wrist-balancing arm 4 through at least one supporting rod 19.
(3) Installation of the auxiliary stabilizing device: after the construction of the contact net support structure is completed, a messenger wire seat 15 is fixedly arranged at the upper end of the front part of the flat cantilever 4 of each contact net support structure, and a messenger wire 12 penetrates through the middle part of the messenger wire seat 15; a positioning line 6 penetrates through a gap between a first line support rod and a second line support rod of the contact net support structure, the positioning line 6 is arranged above a positive feeder line 10 and an auxiliary feeder line 11, line connectors 17 are fixedly arranged on the positioning line 6 at intervals of 60-90 m, the line connectors 17 are fixed on the positioning line 6 through line clamps, the positive feeder line 10 and the auxiliary feeder line 11 penetrate through a threading hole at the end part of the line connector 17, and are connected with the positive feeder line 10 and the auxiliary feeder line 11 through the line connector 17; the connecting wire 17 is mainly used for suspending, stabilizing, fixing and protecting the positioning wire, the positive feeder line 10 and the auxiliary feeder line 11, and plays a role in keeping the wires stable, and the connecting wire 17 selects materials with light weight and high strength as much as possible, so that the supporting function can be achieved, and pressure cannot be applied to the positive feeder line 10 and the auxiliary feeder line 11 due to overweight; the space between the carrier cable 12 and the positioning line 6 is fixedly connected with a hanger 16, the distance between the hangers 16 close to the two sides of the support is 4-6 meters under normal conditions, and the distance between the hangers 16 close to the two sides of the support is 6-10 meters; and a line switch 18 is fixedly arranged on the outer wall between the positive feeder line 10 and the auxiliary feeder line 11 at intervals, and a line clamp and the like are forbidden to be arranged in an initial area 550-1050mm of the line switch 18.
(4) And (3) simulating cold slip detection: performing cold slip detection in an effective range of an on-line switch by using a zero-time pantograph on the operation ladder car, and timely correcting detected data; the detection process is a routine inspection, and comprises wire appearance inspection, whether burrs exist or not and the like, wherein the wire smoothly passes through the range of the main pantograph.
(5) And (3) electrifying the test vehicle for test run: detecting the current trend of the whole device by using related equipment, effectively detecting a contact network of an upper line by using a detection vehicle, eliminating potential safety hazards and effectively protecting the related equipment; the night blockade construction rectification is generally utilized, and the main problems are that the height of a contact net is adjusted, the error is adjusted within 5mm, otherwise, the adjustment is not carried out in general, the small-amplitude adjustment does not influence the test in the next day.
While the invention has been described in further detail in connection with specific embodiments thereof, it will be understood that the invention is not limited thereto, and that various other modifications and substitutions may be made by those skilled in the art without departing from the spirit of the invention, which should be considered to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides an existing double-circuit dials construction structures who connects contact net simultaneously, construction structures includes a plurality of contact net supporting structure that distribute along the straight line, and every contact net supporting structure includes base (1), pillar (2), flat cantilever (4) and oblique cantilever (5), the one end of flat cantilever (4) and oblique cantilever (5) is connected with pillar (2) through insulator (3) respectively, and the other end of oblique cantilever (5) supports at the anterior lower extreme of flat cantilever (4), its characterized in that: the construction structure also comprises a branch rod mechanism arranged at the front end of the flat cantilever (4) of each contact net bracket, a positioning line (6) parallel to the positive feeder line (10) and a carrier cable (12), the rod dividing mechanism comprises a rod divider (7), a first line supporting rod (8), a second line supporting rod (9), a first positioning rod (13) and a second positioning rod (14), the rod divider (7) is fixedly arranged at the lower part of the front end of the flat cantilever (4), one end of the first line supporting rod (8) and one end of the second line supporting rod (9) are connected with the rod divider (7), the other end of the first line supporting rod (8) is fixed on the positive feeder (10), the other end of the second line supporting rod (9) is fixed on the auxiliary feeder (11), one end of the first positioning rod (13) and one end of the second positioning rod (14) are connected with the inclined wrist arm (5), and the other ends of the first positioning rod and the second positioning rod are fixedly connected with the first line supporting rod (8) and the second line supporting rod (9) respectively; the upper part of the front end of the flat cantilever (4) of each contact net support structure is provided with a carrier cable seat (15), the carrier cables (12) are sequentially fixed on the carrier cable seat (15) at the front end of the flat cantilever of each contact net support structure, the positioning line (6) is suspended below the carrier cables (12) through a plurality of hanging strings (16) and is positioned above the positive feeder line (10) and the auxiliary feeder line (11), the positioning line (6) is respectively connected with the positive feeder line (10) and the auxiliary feeder line (11) through a plurality of connecting lines (17), and a line fork (18) is arranged between the positive feeder line (10) and the auxiliary feeder line (11).
2. The construction structure of the existing double-line simultaneous dialing contact network according to claim 1, characterized in that: at least one support rod (19) is respectively arranged between the first positioning rod (13), the second positioning rod (14) and the wrist-leveling arm (4).
3. The construction structure of the existing double-line simultaneous dialing contact network according to claim 1, characterized in that: the novel cantilever is characterized in that an embedded part (200) is arranged in the support column (2), the inclined cantilever (5) is a single-lug cantilever, and the insulator ends of the flat cantilever (4) and the inclined cantilever (5) are respectively connected with the embedded part (200) in the support column (2) through bolts.
4. The construction structure of the existing double-line simultaneous dialing contact network according to claim 1, characterized in that: the pole dividing device (7) comprises a base fixed on the flat cantilever (4) and two connecting plates symmetrically arranged on the base, the upper ends of the first line supporting pole (8) and the second line supporting pole (9) are respectively connected with the two connecting plates, and a positive feeder line threading hole (800) and an auxiliary feeder line threading hole (900) are formed in the bottoms of the first line supporting pole (8) and the second line supporting pole (9); the positive feeder line (10) and the auxiliary feeder line (11) respectively penetrate through the corresponding positive feeder line threading hole (800) and the auxiliary feeder line threading hole (900).
5. The construction structure of the existing double-line simultaneous dialing contact network according to claim 1, characterized in that: the first positioning rod (13) and the second positioning rod (14) are parallel to the flat cantilever (4), one end of the first positioning rod is fixedly connected to the middle of the inclined cantilever (5) through a bolt, and the other end of the first positioning rod is connected to the middle of the first line supporting rod (8) and the second line supporting rod (9) respectively.
6. The construction structure of the existing double-line simultaneous dialing contact network according to claim 1, characterized in that: the positioning line (6) is arranged in the middle of a gap between the first line supporting rod (8) and the second line supporting rod (9); the multiple line connecting devices (17) are distributed at equal intervals of 60-90 m, each line connecting device (17) comprises a line clamp fixed on a positioning line and two groups of supporting rods or supporting frames connected to the line clamp, threading holes are formed in the bottoms of the supporting rods or the supporting frames, and the positive feeder line (10) and the auxiliary feeder line (11) penetrate through the threading holes in the bottoms of the two groups of supporting rods or the supporting frames respectively.
7. A construction method for simultaneously dialing and connecting contact networks of existing double lines is characterized by comprising the following steps:
(1) positioning the mounting position of each contact net support structure according to a design drawing, and making construction preparation work to prepare equipment and construction materials required by construction; the distance between every two adjacent contact net support structures is 40-60 m;
(2) constructing each contact net support structure in sequence; the construction process of each contact net support structure is as follows:
a. constructing a base and a strut of the contact net support structure, and positioning and embedding embedded parts in the strut through steel bars or steel wires when pouring strut concrete;
b. the cantilever of the contact net support structure is installed: the cantilever comprises a flat cantilever arranged at the top of the support column and a single-lug cantilever arranged below the flat cantilever, insulators are arranged at one ends of the flat cantilever and the single-lug cantilever, the end, provided with the insulators, of the flat cantilever is connected with the embedded part in the support column through bolts, the other end of the flat cantilever horizontally extends out of the outer wall of the support column, the end, provided with the insulators, of the single-lug cantilever is connected with the embedded part in the support column through bolts, and the other end of the single-lug cantilever extends out of the support column in an inclined shape and is fixedly connected with the outer wall of the flat cantilever through a connecting piece;
c. the branch rod of the contact net support structure is installed: a branch device is arranged below the front end of the connecting part of the flat cantilever and the single-ear cantilever, and the mounting mode of the support rod is initially divided into a branch type mounting mode through the branch device, namely a first-line support rod and a second-line support rod, and a positive feeder line and an auxiliary feeder line are respectively fixed at the lower ends of the first-line support rod and the second-line support rod;
d. installing a positioning rod of a contact net support structure: the first line supporting rod and the second line supporting rod are respectively connected with the single-lug wrist arm through a first positioning rod and a second positioning rod, and the first positioning rod and the second positioning rod are parallel to the flat wrist arm;
(3) installation of the auxiliary stabilizing device: after the construction of the contact net support structure is completed, a messenger wire seat is fixedly arranged at the upper end of the front part of the flat cantilever of each contact net support structure, and a messenger wire penetrates through the middle part of the messenger wire seat; a positioning line penetrates through the middle part of a gap between a first line support rod and a second line support rod of each contact net support structure, the positioning line is arranged above the positive feeder line and the auxiliary feeder line, and line connectors are fixedly arranged on the positioning line and the outer walls of the positive feeder line and the auxiliary feeder line at intervals of 60-90 m and are connected with the positive feeder line and the auxiliary feeder line through the line connectors; a dropper is fixedly connected between the carrier cable and the positioning line at intervals, and a line fork is fixedly installed on the outer wall between the positive feeder line and the auxiliary feeder line at intervals;
(4) and (3) simulating cold slip detection: performing cold slip detection in an effective range of an on-line switch by using a zero-time pantograph on the operation ladder car, and timely correcting detected data;
(5) and (3) electrifying the test vehicle for test run: the current trend of the whole device is detected by adopting related equipment, and a detection vehicle is used for effectively detecting a contact net of an upper line, so that potential safety hazards are eliminated, and the related equipment is effectively protected.
8. The construction method for simultaneously dialing up the overhead contact system of the existing double-line system according to claim 7, characterized in that: the positioning of the contact net support structure in the step (1) is specifically to mark the position of the center of a strut of the contact net at a designed point position by using a steel chisel and a timber pile after the foundation surface engineering of the roadbed is completed; the preparation work before the construction comprises the following steps: the concrete mixing and proportioning work of the machine is made in advance, the technical completion is carried out for corresponding staff responsible persons, and the safety and the method for well arranging the power are achieved.
9. The construction method for simultaneously dialing up the overhead contact system of the existing double-line system according to claim 7, characterized in that: the construction steps of the base and the support in the step a of the step (2) sequentially comprise: the drilling method comprises the steps of drilling a steel reinforcement cage embedding hole, embedding a steel reinforcement cage of a base and a support, supporting the base and the support, installing an embedded part, pouring a column body and pouring the base, moving a movable drilling machine to a drilling tail hole when the steel reinforcement cage embedding hole is drilled, wherein the drilling tail deviation is less than or equal to two centimeters, drilling a drill bit perpendicular to the ground, measuring the diameter, the depth and the verticality of the hole after the hole is drilled, and timely and effectively cleaning the loose soil at the bottom of the pile.
10. The construction method for simultaneously dialing up the overhead contact system of the existing double-line system according to claim 7, characterized in that: a gasket is arranged between the rod separator and the flat cantilever in the step (2) c; and (d) in the step (2), the first positioning rod and the second positioning rod are fixedly connected with the wrist leveling arm through at least one supporting rod.
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