CN118686020A - A ballastless turnout insertion method for uninterrupted driving - Google Patents

Abstract

The present invention relates to a method for inserting a ballastless turnout for uninterrupted driving. In the present invention, by widening the existing operating line base plate to match the base plate of the inserted turnout, the construction of the inserted turnout plate type ballastless track base plate can be completed without interrupting driving, which has little impact on the operation of the existing line, controllable safety risks, strong construction performance, and good engineering quality; the present invention does not need to chisel out the existing operating line base plate during the entire construction process, and the newly inserted turnout track unit is the same as the existing operating line ballastless track unit, and the existing line track structure is retained to the greatest extent possible, which greatly saves the construction cost of inserting and laying the turnout and shortens the construction period; the inserted ballastless turnout in the present invention adopts factory prefabricated turnout plates, which greatly reduces the workload of on-site concrete pouring and saves construction time. At the same time, the self-compacting concrete layer under the plate adopts fast-hardening and early-strengthening materials, which ensures the smooth passage of trains during the skylight time construction operation.

Description

A ballastless turnout insertion method for uninterrupted driving

Technical Field

The invention relates to the technical field of ballastless track, and in particular to a ballastless turnout insertion method for uninterrupted driving.

Background Art

With the continuous deepening and improvement of my country's railway network construction, a large number of new lines need to be introduced into existing stations. The existing high-speed railway station main lines and adjacent arrival and departure lines in my country generally use ballastless tracks. Due to the long construction period of dismantling existing ballastless tracks and laying new ballastless turnouts, the normal operation of the existing lines cannot be guaranteed, which has a great impact on the traffic organization of the existing lines, and the construction and operation safety risks and economic costs are high. Inserting turnouts in the existing operating high-speed railway ballastless track sections has become an inevitable technical problem in the development of my country's high-speed railways.

Through searching, it is found that there are few patents for inserting ballastless turnouts in railways. The existing patent CN 117468285 A discloses a method for inserting turnouts in railway operating lines and a longitudinal moving device, the patent CN 108708233 A discloses a method for overall turnout laying construction, and the patent CN 115748516 A discloses a bridge reconstruction construction method for adding line turnouts to existing railway bridges. The above-mentioned related patents cannot realize the insertion of ballastless turnouts under the condition of uninterrupted driving within a limited skylight time, and at the same time have a greater impact on the operation of existing lines, a higher safety risk, poor construction performance, and uncontrollable engineering quality.

Summary of the invention

In view of the above problems, a ballastless turnout insertion method with uninterrupted driving is provided to solve the problem of completing the ballastless turnout insertion during the window time on the existing operating lines.

The specific technical solutions are as follows:

A method for inserting a ballastless turnout for uninterrupted driving comprises the following steps:

S1: Determine the mileage range of the turnout according to the design situation, and determine the length unit and corresponding quantity of the corresponding prefabricated turnout plate according to the length unit of the existing ballastless track, and prefabricate the turnout plate;

S2: Use skylight points to chisel out the closed layer between lines and set up isolation measures to isolate the construction area from the driving area;

S3: In the construction area, the base plate of the existing ballastless track of the operating line shall be widened according to the size of the base plate of the newly inserted turnout;

S4: Use the large skylight time to lift and remove the track slab and self-compacting concrete layer of the original ballastless track within the turnout range to expose the base plate;

S5: An isolation layer is set on the top surface of the base plate with a formed width, and a steel mesh is laid on the isolation layer;

S6: According to the layout of the turnout, the prefabricated turnout plate is installed on the corresponding turnout area base plate and the steel mesh, and the self-compacting concrete is cast under the turnout plate to form a self-compacting concrete layer covering the steel mesh;

S7: Curing of the self-compacting concrete layer and installation of the switchback accessories after formwork removal;

S8: Remove isolation facilities, restore the closed layers between the lines and on both sides, and complete the insertion of ballastless turnouts.

Specifically, the length unit of the switch plate in step S1 is consistent with the length unit of the ballastless track of the existing operating line.

Specifically, the isolation measure in step S2 is a barrier-type isolation measure.

Specifically, the width-adding method in step S3 is as follows: the base plate of the existing operating line ballastless track that is wider than the concrete part of the track plate is chiseled out to expose the steel bars, and the steel cage is extended and tied according to the steel bar arrangement of the base plate in the switch area, and the exposed steel bars are tied to the steel cage. After the tying is completed, the formwork is erected, and concrete is poured according to the size of the base plate in the switch area, and then maintained.

Specifically, in step S5, the isolation layer is a geotextile isolation layer, and the geotextile isolation layer is in close contact with the top surface of the base plate.

Specifically, in step S5, the steel mesh can be ensured to be located in the middle of the self-compacting concrete layer in the vertical direction by using a spacer.

Specifically, when pouring the self-compacting concrete in step S6, the turnout plate needs to be pressed tightly to prevent the turnout plate from floating and deforming during the pouring of the self-compacting concrete.

Specifically, in step S6, a plurality of gate-shaped ribs are provided on the bottom of the turnout plate to strengthen the connection with the self-compacting concrete layer to form a composite plate structure.

Specifically, in step S7, the mold is removed after the strength meets the temporary driving requirement.

Specifically, the installation and laying of the turnout rail parts in step S7 sequentially includes placing the turnout fastener iron pads and rail underpads, hoisting the switch assembly into place, hoisting the movable heart rail frog assembly into place, installing and adjusting the straight rail parts, installing and adjusting the curved rail parts, and quality inspection.

The beneficial effects of the above scheme are:

1) By widening the existing operating line base plate to match the base plate of the turnout, the construction of the turnout plate ballastless track base plate can be completed without interrupting traffic, which has little impact on the operation of the existing line, controllable safety risks, strong construction performance and good engineering quality;

2) During the entire construction process, there is no need to remove the existing operating line base plate. At the same time, the newly inserted turnout track unit is the same as the existing operating line ballastless track unit, which can retain the existing track structure as much as possible, greatly saving the construction cost of inserting turnouts and shortening the construction period;

3) The inserted ballastless turnout adopts factory-prefabricated turnout plates, which greatly reduces the workload of on-site concrete pouring and saves construction time. At the same time, the self-compacting concrete layer under the plate adopts fast-hardening and early-strengthening materials, which ensures the smooth passage of trains during the construction work during the skylight time;

4) The method for inserting ballastless turnouts for uninterrupted traffic proposed in the present invention has simple steps and convenient operation, and can effectively complete the one-time insertion and laying of ballastless turnouts during the window time without interrupting traffic; it effectively improves the efficiency of inserting ballastless turnouts on existing lines, reduces construction costs, and reduces the impact of inserting turnouts on the normal operation of the line during the day, and has good application prospects and promotion value.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a construction step diagram of a ballastless turnout insertion method for uninterrupted traffic provided in an embodiment of the present invention;

FIG2 is a cross-sectional view of a ballastless track structure of an existing operating line in the prior art;

FIG. 3 is a cross-sectional view of the present invention after the prefabricated plate type turnout track structure is inserted.

In the attached figure:

11. Rails 12. Fasteners 13. Track plates

15. Self-compacting concrete layer 16. Base plate 17. Limiting groove

19. Sealing layer

24. Prefabricated turnout plate 25. Self-compacting concrete layer 26. Turnout base plate 27. Limiting groove 28. Turnout rail parts.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

The present invention takes the existing CRTSIII slab track inserted into the ballastless turnout as an example for explanation. The existing CRTSIII slab track consists of rails 11, fasteners 12, track plates 13, self-compacting concrete layers 15, geotextile isolation layers, base plates 16, etc., as shown in FIG2. The CRTSIII ballastless track track plate 13 is 5.6m long, with a plate gap of 100mm, a thickness of 200mm, and a width of 2.5m; the self-compacting concrete layer 15 is the same length and width as the track plate 13, and is 100mm thick; the base plate 16 is 3.3m wide and 300mm thick.

As shown in FIG1 , the present invention provides a method for inserting a ballastless turnout for uninterrupted driving, comprising the following steps:

S1: Measure and determine the mileage range of the turnout according to the design situation, and determine the length unit of the corresponding prefabricated turnout plate 24 according to the length unit of the existing ballastless track (the length unit of the prefabricated turnout plate 24 is consistent with the length unit of the existing ballastless track, which is 5.6 meters) and the corresponding quantity, and prefabricate the turnout plate;

S2: Use the skylight point to chisel out the closed layer 19 between the lines and set up enclosure isolation measures to hard isolate the construction area from the driving area. The above construction area should cover the length range of the inserted turnout;

The above-mentioned enclosure isolation measures can be specifically as follows: a supporting column is set up every 3 meters, a diagonal brace is installed behind each supporting column, and an isolation net with a height of 2.2 meters is installed between adjacent supporting columns;

S3: The base plate 16 of the existing operating line ballastless track in the construction area, which is wider than the concrete part of the track plate 13, is chiseled out to expose the steel bars, and the steel cage is extended and tied according to the steel bar arrangement form of the base plate 26 in the switch area, and the exposed steel bars are tied to the steel cage. After the tying is completed, the mold is erected, and concrete is poured according to the size of the base plate 26 in the switch area, and maintenance is performed. The base plate 16 of the existing operating line ballastless track can be widened according to the size of the base plate 26 of the newly inserted switch;

S4: using the large skylight time to lift and remove the track plate 13 and the self-compacting concrete layer 15 of the original CRTSIII ballastless track to be inserted into the turnout range, exposing the base plate 16, and cleaning the top surface and the top surface groove of the base plate 16, and leveling the top surface of the base plate 16;

S5: A geotextile isolation layer of a certain thickness is closely arranged on the top surface of the base plate 26 formed by the side width, and a steel mesh is laid on the geotextile isolation layer;

S6: According to the layout of the turnout, hoist, roughly lay, and fine-tune (fine-tune can be achieved through the fine-tune claws on the left and right sides of the plate) the prefabricated turnout plate 24 to the corresponding turnout area base plate 26 and the top of the steel mesh, and install and fix the self-compacting concrete layer mold; then use a clamping device such as spikes to clamp the two sides of the prefabricated turnout plate 24 to prevent the prefabricated turnout plate 24 from floating and deforming during the subsequent pouring of self-compacting concrete; pour the self-compacting concrete through the grouting holes on the prefabricated turnout plate 24 to form a self-compacting concrete layer 25 with a certain thickness and covering the steel mesh in one construction;

During the above pouring process, the self-compacting concrete steel mesh can be ensured to be located in the middle of the self-compacting concrete layer 25 by means of a pad;

In order to strengthen the connection between the turnout plate and the self-compacting concrete layer 25, a plurality of gate-shaped ribs may be provided at the bottom of the turnout plate, so that the turnout plate and the self-compacting concrete layer 25 form a composite plate structure by using the gate-shaped ribs; based on similar purposes, when the existing operating line CRTSIII type ballastless track base plate 16 is widened, the limiting groove on the base plate 16 can also be widened synchronously in the present invention, and when the self-compacting concrete layer 25 is subsequently poured, the self-compacting concrete layer 25 can form a limiting boss, and the limiting boss is coupled with the limiting groove for limiting;

S7: Perform self-compacting concrete layer 25 maintenance, remove the mold, install and lay the turnout rail parts, weld and lock the seamless turnout, fine-tune and grind;

The installation and laying of the above-mentioned turnout rail parts include, in sequence, placing the turnout fastener iron pads and rail underpads, hoisting the switch assembly into place, hoisting the movable heart rail frog assembly into place, installing and adjusting the straight rail parts, installing and adjusting the curved rail parts, and quality inspection;

S8: Remove isolation facilities, restore the track and the closed layers on both sides, complete the insertion of ballastless turnouts, and conduct acceptance and normal operation.

In the present invention, the above-mentioned turnout insertion construction can be divided into several construction units and carried out simultaneously to reduce the construction time as much as possible.

The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for inserting a ballastless turnout for uninterrupted driving, characterized in that it comprises the following steps: S1: Determine the mileage range of the turnout according to the design situation, and determine the length unit and corresponding quantity of the corresponding prefabricated turnout plate according to the length unit of the existing ballastless track, and prefabricate the turnout plate; S2: Use skylight points to chisel out the closed layer between lines and set up isolation measures to isolate the construction area from the driving area; S3: In the construction area, the base plate of the existing ballastless track of the operating line shall be widened according to the size of the base plate of the newly inserted turnout; S4: Use the large skylight time to lift and remove the track slab and self-compacting concrete layer of the original ballastless track within the turnout range to expose the base plate; S5: An isolation layer is set on the top surface of the base plate with a formed width, and a steel mesh is laid on the isolation layer; S6: According to the layout of the turnout, the prefabricated turnout plate is installed on the corresponding turnout area base plate and the steel mesh, and the self-compacting concrete is cast under the turnout plate to form a self-compacting concrete layer covering the steel mesh; S7: Curing of the self-compacting concrete layer and installation of the switchback accessories after formwork removal; S8: Remove isolation facilities, restore the closed layers between the lines and on both sides, and complete the insertion of ballastless turnouts. 2. The method for inserting a ballastless turnout for uninterrupted traffic according to claim 1 is characterized in that the length unit of the turnout plate in step S1 is consistent with the length unit of the ballastless track of the existing operating line. 3. The ballastless turnout insertion method for uninterrupted traffic according to claim 1 is characterized in that the isolation measure in step S2 is an enclosure-type isolation measure. 4. The method for inserting a ballastless turnout for uninterrupted traffic according to claim 1 is characterized in that the width-enhancing method in step S3 is as follows: the base plate of the existing operating line ballastless track that is wider than the concrete part of the track plate is chiseled out to expose the steel bars, and the steel cage is extended and tied according to the steel bar arrangement form of the base plate in the switch area, and the exposed steel bars are tied to the steel cage. After the tying is completed, a mold is erected, and concrete is poured according to the size of the base plate in the switch area, and then maintained. 5. The method for inserting a ballastless turnout for uninterrupted traffic according to claim 1, characterized in that the isolation layer in step S5 is a geotextile isolation layer, and the geotextile isolation layer is in close contact with the top surface of the base plate. 6. The method for inserting a ballastless turnout for uninterrupted traffic according to claim 1 is characterized in that in step S5, the steel mesh can be ensured to be located in the middle of the self-compacting concrete layer in the vertical position by a spacer. 7. The method for inserting a ballastless turnout for uninterrupted traffic according to claim 1 is characterized in that the turnout plate needs to be pressed when pouring the self-compacting concrete in step S6 to prevent the turnout plate from floating and deforming during the pouring of the self-compacting concrete. 8. The method for inserting a ballastless turnout for uninterrupted traffic according to claim 1, characterized in that in step S6, a plurality of gate-shaped ribs are provided at the bottom of the turnout plate to strengthen the connection with the self-compacting concrete layer to form a composite plate structure. 9. The method for inserting a ballastless turnout for uninterrupted traffic according to claim 1, characterized in that the mold is removed after the strength meets the temporary traffic requirement in step S7. 10. The ballastless turnout insertion method for uninterrupted traffic according to claim 1 is characterized in that the installation and laying of the turnout rail parts in step S7 sequentially includes placing the turnout fastener iron pads and rail underpads, hoisting the switch assembly into place, hoisting the movable heart rail frog assembly into place, installing and adjusting the straight rail parts, installing and adjusting the curved rail parts, and quality inspection.