Large railway yard contact net transformation construction method

Abstract

The invention discloses a transformation construction method for a large railway yard contact net. A first set of existing stand columns, a second set of existing stand columns, a third set of existing stand columns and existing lines are included. The transformation construction method comprises the steps that layout design is conducted, specifically, a transformation line is arranged at an existing line, and an existing stand column located in the transformation line is marked as a first stand column; marking an existing stand column which is located on the outer side of the transformation line and located on the outer side of the existing line as a second stand column; the remaining existing stand columns located on the outer side of the transformation line are marked as third stand columns; existing pillar detection: carrying out internal crack detection and wall thickness detection on weld joints and joints of a second pillar and a third pillar; reconstruction construction is conducted, a new stand column is newly built on one side of the first stand column, and the corresponding first stand column is dismantled; a stay wire is additionally arranged on the side, away from the existing line, of the third stand column; and a new second stand column is newly built on the outer side of the reformed line. The method reduces the construction cost, shortens the construction period, reduces the construction interference and is worthy of popularization.

Description

Technical Field

[0001] This invention relates to the field of railway overhead contact line construction technology, specifically to a method for the renovation and construction of overhead contact lines in large railway stations. Background Technology

[0002] Large-scale railway station renovation is a key project for improving railway transport capacity and optimizing station operation efficiency. The coordinated construction of the pre-station track and the overhead contact line transition directly affects the overall quality and progress of the renovation project. As a core component of the railway traction power supply system, the overhead contact line transition construction must ensure the normal power supply to existing lines while providing compatible working conditions for pre-station works such as new track laying and turnout installation. This is a crucial link in station renovation that is technically challenging and requires strict coordination.

[0003] During the construction of large-scale railway station renovation projects, the transitional construction of the overhead contact system mainly faces two core scenarios: First, the spatial layout or operational status of the existing line hinders the erection of new overhead contact system supports, preventing normal construction at the designed location and requiring avoidance of the existing line's influence area. Second, the location of existing overhead contact system supports conflicts with the laying path of the new line, with existing supports occupying planned space for the new line and affecting the smooth progress of track laying operations. To address the construction compatibility issues in these two scenarios, existing technologies generally adopt a unified technical solution of "re-erecting supports + constructing new flexible cross spans." Specifically, at least two new overhead contact system supports are erected on both sides of the new line in the affected section, or on both sides of the existing and new lines. A complete flexible cross span structure is installed on the new supports, and then the conductors of both the existing and new lines are suspended together on the new flexible cross span. This method ensures traction power supply during the transition phase while providing working space for track construction in front of the station, achieving compatibility between power supply and construction.

[0004] However, the aforementioned existing technical solutions have several significant drawbacks in practical application: First, the construction cost remains high. This solution requires the additional procurement of at least two catenary supports, involving a series of procedures such as support transportation, foundation excavation, and support erection. Simultaneously, it requires the installation of a complete flexible cross-span structure and related connectors. The combined material costs, labor costs, and machinery usage costs of the supports and flexible cross-spans significantly increase the overall cost of the catenary transition construction, resulting in a waste of project investment. Second, the construction period is significantly extended. The foundation construction of the new supports is time-consuming, and the installation and commissioning of the flexible cross-spans also require coordination with the support erection process. The overall procedures are cumbersome and lengthy, making rapid construction impossible, thus extending the total construction period of the entire station renovation project and affecting the progress of improving railway operational efficiency. Third, construction interference is a prominent issue. The erection of new support pillars and the installation of flexible cross spans require limited working space in the station area. This space often overlaps with the working areas of other key construction processes such as track laying, turnout installation, and track adjustment, easily leading to conflicts in construction procedures, mutual interference between different construction stages, reduced overall construction efficiency, and even potential safety hazards. Fourth, there is a serious waste of existing facility resources. In many application scenarios, the existing flexible cross span supports of the overhead contact system still possess good structural strength and load-bearing capacity, fully capable of meeting the stress requirements of transitional construction. However, existing technical solutions do not make reasonable use of these existing supports, but instead leave them idle or dismantle them, resulting in the inability to realize the resource value of existing facilities, causing serious resource waste, and failing to conform to the green and energy-saving concept of engineering construction.

[0005] In summary, existing overhead contact line transition construction technologies for large-scale railway station renovations suffer from prominent problems such as high cost, long cycle, significant interference, and resource waste, making it difficult to meet the requirements of station renovation projects for economy, efficiency, compatibility, and resource utilization. Therefore, a new overhead contact line transition construction technology is urgently needed to address the aforementioned shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a construction method for the renovation of the overhead contact system in large railway stations. This method solves the technical problems of high cost, long cycle, large interference, and waste of resources in the existing overhead contact system transition construction technology in the renovation of large railway stations.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A construction method for upgrading the overhead contact system of a large railway station, wherein the structure of the upgraded overhead contact system includes a first group of existing columns, a second group of existing columns, a third group of existing columns, and the existing railway line; the construction method includes the following steps: Step 1, layout design: Layout the modification route at the existing line location. Mark the existing posts located within the modification route as the first post; mark the existing posts located outside the modification route and at a distance from the outer edge of the existing line as the second post; mark the remaining existing posts located outside the modification route as the third post. Step two: Existing support column inspection, internal crack inspection of the welds and connections of the third column; wall thickness inspection of the third column; Step 3: Construction and renovation. On one side of the first post, outside the renovation line, a new post is built, and the corresponding first post is removed. A guy wire is installed on the side of the third post away from the existing line. One end of the guy wire is fixed to the top of the third post, and the other end is anchored to the ground foundation. A new second post is built on the outside of the renovation line, at the position corresponding to the third post.

[0008] Preferably, in step two, a static load test is performed on the third column; a simulated load is applied to the top of each third column, and the deflection and stress of each third column are monitored.

[0009] Preferably, the first group of existing columns includes one or more first columns; the second group of existing columns includes one or more first columns; and the third group of existing columns includes the second columns and the third columns arranged opposite to each other.

[0010] Preferably, in step two, the load-bearing capacity of the soft cross-span hanging point at the top of the third column is tested.

[0011] Preferably, the new first column and the corresponding third column form a transitional soft span structure; the new second column and the corresponding third column form a transitional soft span structure.

[0012] Preferably, the third column simultaneously suspends the conductors of the existing line and the conductors of the modified line.

[0013] The modified construction method used in this invention has the following beneficial effects: 1. Reduce construction costs: By reusing existing columns and reducing the number of new columns (reducing the number of columns in each group by 1 or more), the costs of purchasing corresponding columns and foundation construction are saved. At the same time, the amount of materials used for soft cross-span erection is reduced, which greatly reduces the overall construction cost.

[0014] 2. Shorten the construction cycle: Reduce the number of steps for column assembly, foundation maintenance and complete erection of soft cross spans, significantly shorten the construction cycle and avoid long-term conflicts with other processes.

[0015] 3. Reduced construction interference: No additional working space is required for the erection of new columns, and the installation of guy wires and the extension of soft cross spans are simple, significantly reducing interference with core processes such as track laying and turnout installation.

[0016] 4. Conserve resources: Make full use of the load-bearing potential of existing soft cross-span columns, avoid resource waste caused by idleness or demolition, and conform to the concept of green construction.

[0017] 5. High adaptability: Differentiated solutions are designed for different locations, which not only solves the problem of interference with existing columns, but also takes into account the differences in the load-bearing capacity of existing columns, and adapts to the actual needs of different station renovations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall modification of the present invention; Figure 2 This is a schematic diagram illustrating the modification of the first group of existing columns according to the present invention; Figure 3 This is a schematic diagram illustrating the modification of the second group of existing columns according to the present invention; Figure 4 This is a schematic diagram illustrating the modification of the third group of existing columns according to the present invention; In the diagram: 1. Existing poles in the first group; 2. Existing poles in the second group; 3. Existing poles in the third group; 4. Existing power line; 5. Power line to be upgraded; 6. First pole; 7. Second pole; 8. Third pole; 10. Guy wire; 11. New pole; 12. New pole. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings: like Figures 1 to 4 The method for upgrading the overhead contact line of a large railway station, as shown, includes a first group of existing columns 1, a second group of existing columns 2, a third group of existing columns 3, and an existing railway line 4; the existing railway line 4 is erected on the first group of existing columns 1, the second group of existing columns 2, and the third group of existing columns 3. An upgraded railway line 5 is installed on one side of the existing railway line 4.

[0020] The renovation construction method includes the following steps: Step 1: Layout design. The existing line 5 is laid out at 4 locations on the existing line. The existing pillars located within the line 5 are marked as the first pillar 6. The first pillar 6 affects the construction of the line 5 and will be removed later.

[0021] The existing pillar located outside the modified line 5 and at a distance from the outer side of the existing line 4 is marked as the second pillar 7. The second pillar 7 does not participate in the construction of the modified line 5, nor does it affect the construction of the modified line 5, so it does not need to be removed.

[0022] The remaining existing pillars located outside the renovated line 5 are marked as the third pillar 8, and the third pillar 8 participated in the construction of the renovated line 5.

[0023] The first group of existing columns 1 includes one or more first columns 6; the second group of existing columns 2 includes one or more first columns 6; the third group of existing columns 3 includes second columns 7 and third columns 8 arranged opposite to each other.

[0024] Step two, existing support inspection. The third support column 8 participates in the construction of the modified line 5. The welds and connections of the third support column 8 are inspected for internal cracks. The inspection method is magnetic particle testing or penetrant testing, such as the weld connecting the flange and the column.

[0025] The wall thickness of the third column 8 was measured using an ultrasonic thickness gauge to ensure that there was no excessive corrosion causing thinning of the wall thickness.

[0026] A static load test was conducted on the third column 8 in the field. A simulated load was applied to the top of each third column 8, and the deflection and stress of each third column 8 were monitored. Specifically, horizontal / vertical loads were applied using sandbags or tension jacks, and strain gauges were used to detect the stress.

[0027] The load-bearing capacity of the top flexible cross-span hanging point of the third column 8 is tested, including the material and quantity of the hanging point bolts, and whether there is wear.

[0028] Step three: Construction of the renovation project. A new pillar 11 is constructed on one side of the first pillar 6, outside the renovated line 5. The corresponding first pillar 6 is removed. The new pillar 11 and the corresponding third pillar 8 form a transitional soft cross-span structure, resulting in a "single old + single new" structure. The conductor of the renovated line 5 is directly suspended from this structure. This method primarily applies to the first group of existing pillars 1. For example... Figure 2 As shown.

[0029] A guy wire 10 is installed on the side of the third column 8 furthest from the existing line 4. One end of the guy wire 10 is fixed to the top of the third column 8, and the other end is anchored to the ground foundation. A new second column 12 is built on the outside of the modified line 5, corresponding to the third column 8. The new second column 12 and the corresponding third column 8 form a transitional soft span structure. The guy wire 10 enhances the load-bearing capacity of the third column 8; the overall structure is "existing column (with guy wire) + new column", simultaneously suspending the conductor of the existing line 4 and the conductor of the modified line 5. This situation mainly applies to the second group of existing columns 2. Figure 3 As shown.

[0030] In the case of construction on the third set of existing pillars 3, the two existing pillars located on both sides of the existing line 4 will not affect the construction of the modified line 5. However, the existing pillar between the existing line 4 and the modified line 5 can be used, and then a new pillar 11 can be built on the other side of the modified line 5 to form a transition soft cross-span suspension conductor. Figure 4 As shown.

[0031] The above embodiments are merely illustrative of the concept and implementation of the present invention and are not intended to limit it. Under the concept of the present invention, technical solutions without substantial changes are still within the scope of protection.

Claims

1. A construction method for the renovation of the overhead contact system in a large railway station, wherein the structure of the overhead contact system renovation includes a first group of existing columns (1), a second group of existing columns (2), a third group of existing columns (3), and an existing railway line (4); characterized in that: The renovation construction method includes the following steps: Step 1, layout design: Layout the modified line (5) at the existing line (4), mark the existing pillars located within the modified line (5) as the first pillar (6); mark the existing pillars located outside the modified line (5) and located far from the outside of the existing line (4) as the second pillar (7); mark the remaining existing pillars located outside the modified line (5) as the third pillar (8). Step 2: Existing support inspection, internal crack inspection is carried out at the weld and connection of the third column (8); wall thickness inspection is carried out on the third column (8); Step 3, renovation construction: On one side of the first column (6) and outside the renovation line (5), a new column (11) is built and the corresponding first column (6) is removed; a guy wire (10) is installed on the side of the third column (8) away from the existing line (4), one end of the guy wire (10) is fixed on the top of the third column (8) and the other end of the guy wire (10) is anchored to the ground foundation; a new second column (12) is built outside the renovation line (5) at the position corresponding to the third column (8).

2. The construction method for the renovation of the overhead contact system in a large railway station as described in claim 1, characterized in that: In step two, a static load test is performed on the third column (8); a simulated load is applied to the top of each third column (8), and the deflection and stress of each third column (8) are monitored.

3. The construction method for the renovation of the overhead contact system of a large railway station according to claim 1 or 2, characterized in that: The first group of existing columns (1) includes one or more first columns (6); the second group of existing columns (2) includes one or more first columns (6); the third group of existing columns (3) includes the second column (7) and the third column (8) arranged opposite to each other.

4. The construction method for the renovation of the overhead contact system of a large railway station according to claim 2, characterized in that: In step two, the load-bearing capacity of the soft cross-span hanging point at the top of the third column (8) is tested.

5. The construction method for the renovation of the overhead contact system of a large railway station according to claim 3, characterized in that: The new first column (11) and the corresponding third column (8) form a transition soft cross structure; the new second column (12) and the corresponding third column (8) form a transition soft cross structure.

6. The construction method for the renovation of the overhead contact system of a large railway station according to claim 5, characterized in that: The third column (8) simultaneously suspends the conductor of the existing line (4) and the conductor of the modified line (5).

Images