A construction method for dismantling existing railways under complex municipal road operation conditions

Abstract

The present invention provides a method for dismantling existing railways under complex municipal road operation conditions, including the steps of traffic diversion, rail cutting, rail hoisting, ballast reuse, cold patch filling, hoisting and cutting material reuse, road restoration, etc. The present invention is simple in construction and operation, greatly reduces the difficulty of rail dismantling construction, can be constructed at night and traffic can be developed during the day, the impact on existing traffic during the dismantling construction is small, rapid dismantling and rapid restoration are achieved, the dismantled materials can be reused, and the low-carbon and environmental protection effects are fully exerted, a large amount of costs are saved, and the economic effect is remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of railway demolition, in particular to a construction method for demolishing an existing railway under complex municipal road operation conditions. Background Art

[0002] With the continuous progress of social economy and science and technology, the speed of urban renewal is increasing, and the traffic conditions of urban roads have been significantly improved. Railway transportation has gradually ceased to occupy the dominant position of urban transportation in today's society. Urban railways have gradually been abandoned due to their reduced carrying capacity and many impacts on social roads. When people have demands for ecological cities and urban comfort, the old railway framework can no longer keep up with the ever-changing urban form and layout, and the original railway tracks have been abandoned and forgotten. In addition, with the continuous development of society and the gradual improvement of safety and quality management levels, traditional demolition methods have many drawbacks and many safety hazards. In addition, the traditional demolition method causes serious damage to the materials within the scope of the demolished railway tracks, and the waste of materials is serious, which is inconsistent with the concept of "green building development under the background of carbon emission reduction". Summary of the invention

[0003] In view of the above-mentioned prior art, the present invention provides a construction method for dismantling existing railways under complex municipal road operating conditions to solve the problems of traditional dismantling methods taking a long time, requiring high investment, having great safety risks, and having many quality risks.

[0004] The present invention provides a method for dismantling an existing railway under complex municipal road operation conditions, comprising the following steps:

[0005] S1. Traffic diversion: Based on the road traffic operation and traffic flow in the construction area, the traffic flow during the removal of the existing road tracks will be evenly distributed in time and space. The construction units will be divided and the principle of induction as the main and control as the auxiliary will be adopted. During the construction period, the single-lane motor vehicle lane will be closed and the main road will ensure at least two-way four-lane traffic;

[0006] S2. Rail cutting: When the construction site meets the cutting conditions, the cutting edge is laid out according to the divided sections, and then a high-power cutting machine is used to divide and cut the sections;

[0007] S3. Rail hoisting: After the rails are cut, the hoisting holes are made manually. The hoisting holes are located in the middle of the rails. In accordance with the symmetry requirements, the rails are hoisted as a whole using bow-shaped clamps and steel wire ropes. After the rails are hoisted as a whole, they are immediately transported away from the site;

[0008] S4. Ballast recycling: After the overall hoisting of the rails is completed, the ballast under the hoisting is manually cleaned. During the cleaning process, it is strictly forbidden to over-excavate the underlying base. After cleaning, the ballast is transported to the mixing station and verified by test mix ratio before being used for asphalt surface layer or water-stable base paving construction;

[0009] S5, Cold patch filling: After the rails are hoisted manually and the construction area is manually cleaned, the road is temporarily repaired by paving graded crushed stone + cold patch asphalt on site;

[0010] S6. Reuse of hoisted and cut materials: After the rails are hoisted as a whole and transported to the material storage area, they are partially trimmed and processed, and the trimmed cut materials are transported to the site as assembled access roads.

[0011] S7. Road restoration: After the removal of the entire section of rails, the laid cold patch asphalt material will be milled and restored according to the original road structure layer design.

[0012] Preferably, in S1, the construction fence adopts an assembled painted fence.

[0013] Preferably, in S2, the existing rail conditions are investigated in detail before cutting, the structural layer conditions of the rails crossing the road, the foundation strength, foundation thickness and other information are clarified, and based on the information obtained, the sidewalk or non-motorized vehicle lane is used to cut the test section at the location with less impact on traffic operation to determine the cutting parameters.

[0014] Preferably, in S3, to ensure smooth lifting, a 15 cm wide cutting seam is cut around the cutting seam to reduce lifting obstacles.

[0015] Preferably, in S5, the graded gravel is paved by using a small manual roller in combination with machinery for rolling, the compaction degree is controlled at more than 93%, and the graded gravel is filled to 30 cm from the road surface.

[0016] Preferably, in S5, the temporary surface paving uses medium-grained AC-16 modified cold patch asphalt for on-site paving. The potholes are cleaned before paving. After cleaning, emulsified asphalt cold primer is used for artificial base coating. After drying, the potholes are filled in layers and compacted layer by layer. The layer thickness is controlled at 3-5cm. When filling the top layer of asphalt, fill enough asphalt into the potholes until the asphalt protrudes 1.3-1.6cm above the ground. After filling, the center of the pothole is slightly higher than the surrounding road surface and is arc-shaped.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the construction operation of the present invention is simple, which greatly reduces the difficulty of rail removal construction, can be constructed at night and traffic can be developed during the day, and the impact on existing traffic during the removal construction is small, and rapid removal and rapid recovery can be achieved. The removed materials can be reused, giving full play to the low-carbon and environmentally friendly effects, saving a lot of costs, and having significant economic effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the division of railway cutting sections in an embodiment of the present invention.

[0019] Figure 2 , 3 Schematic diagram of rail section cutting in an embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the overall hoisting of the rails in an embodiment of the present invention.

[0021] In the figure, 1. road structure layer; 2. rails; 3. rail structure layer; 4. cutting machine. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects provided by the present invention easy to understand, the technical solution of the present invention is described in detail below, but the protection scope of the present invention is not limited to the described embodiments.

[0023] The present invention provides a method for dismantling an existing railway under complex municipal road operation conditions, comprising the following steps:

[0024] S1. Traffic diversion: Based on the road traffic operation and traffic flow conditions in the construction area, the traffic flow during the removal of the existing road tracks is evenly distributed in time and space, and the construction units are divided. The principle of diversion as the main and control as the auxiliary is adopted. During the construction period, the single-lane motor vehicle lane is closed, and the main road is guaranteed to have at least two-way four-lane traffic;

[0025] Furthermore, the construction fence adopts assembled painted fence, which is convenient to operate and has good linear control. The fence has good resistance to wind and traffic impact, which can ensure construction safety. The fence can also be diverted in the early morning or at night when the traffic flow is small to reduce the impact on traffic.

[0026] S2. Rail cutting: When the construction site meets the cutting conditions, the cutting edge is released according to the divided sections (such as Figure 1 As shown), and then use a high-power cutting machine to divide and cut the sections (as shown Figure 2 , 3 As shown), water is taken for cooling and dust reduction during the whole cutting process;

[0027] Furthermore, before cutting, the existing rails should be investigated in detail to clarify the structural layer 3 of the rails crossing the road, as well as information such as foundation strength and thickness. Based on this information, test sections should be cut on areas with less impact on traffic operations using sidewalks or non-motorized vehicle lanes to determine cutting parameters (thickness, strength, etc.).

[0028] S3. Rail hoisting: After the rails are cut, the hoisting holes are made manually. The hoisting holes are located in the middle of the rails. In accordance with the symmetry requirements, the whole hoisting is carried out using bow-shaped clamps and steel wire ropes (such as Figure 4 As shown in the figure, to ensure smooth lifting, a 15cm wide cutting seam is cut around the cutting seam to reduce obstacles during lifting. After the rail is lifted as a whole, it is immediately transported away from the site. Among them, lifting clips, lifting rigging, etc. are selected according to the width of the rail and the overall lifting weight to ensure that the lifting points are symmetrical and the lifting is balanced.

[0029] S4. Ballast recycling: After the overall lifting of the rails is completed, the ballast under the lifting is manually cleaned. During the cleaning process, it is strictly forbidden to over-excavate the underlying base. After cleaning, the ballast is transported to the mixing station and verified by test mix ratio before being used for asphalt surface layer or water-stabilized base layer paving construction.

[0030] S5, Cold patch filling: After the rails are hoisted manually and the construction area is manually cleaned, the road is temporarily repaired by paving graded crushed stone + cold patch asphalt on site;

[0031] Furthermore, the graded gravel paving is compacted by a small manual roller in combination with machinery, and the compaction degree is controlled at more than 93%. After compaction, a layer of fine sand is evenly sprinkled on the surface, and a sweeping tool is used to sweep back and forth to facilitate the fine sand to fill the surface gaps, and the graded gravel is filled to 30cm from the road surface;

[0032] Furthermore, the temporary surface paving uses medium-grained AC-16 modified cold patch asphalt for on-site paving. The potholes are cleaned before paving. After cleaning, emulsified asphalt cold primer is used for artificial base coating. After drying, it is filled in layers and compacted layer by layer. The layer thickness is controlled at 3-5cm. When filling the top layer of asphalt, fill enough asphalt into the potholes until the asphalt protrudes 1.3-1.6cm above the ground. After filling, the center of the pothole is slightly higher than the surrounding road surface and is arc-shaped.

[0033] S6. Reuse of hoisted and cut materials: After the rails are hoisted as a whole and transported to the material storage area, they are partially trimmed and processed, and the trimmed cut materials are transported to the site as assembled access roads.

[0034] S7. Road restoration: After the removal of the entire section of rails, the laid cold patch asphalt material will be milled and restored according to the original road structure layer design. During the restoration period, in order to ensure the overlap of the new and old roads, the existing road will be additionally milled to a width of 1m. During the road restoration period, geogrids will be used for overlapping treatment.

[0035] The above are only implementation modes of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure made using the contents of the present invention's specification and drawings, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present invention.

Claims

1. A method for dismantling existing railways under complex municipal road operation conditions, characterized in that: The steps include: S1. Traffic diversion: Based on the road traffic operation and traffic flow conditions in the construction area, the traffic flow during the removal of the existing road tracks is evenly distributed in time and space, and the construction units are divided. The principle of diversion as the main and control as the auxiliary is adopted. During the construction period, the single-lane motor vehicle lane is closed, and the main road is guaranteed to have at least two-way four-lane traffic; S2. Rail cutting: When the construction site meets the cutting conditions, the cutting edge is laid out according to the divided sections, and then a high-power cutting machine is used to divide and cut the sections; S3. Rail hoisting: After the rails are cut, the hoisting holes are made manually. The hoisting holes are located in the middle of the rails. In accordance with the symmetry requirements, the rails are hoisted as a whole using bow-shaped clamps and steel wire ropes. After the rails are hoisted as a whole, they are immediately transported away from the site; S4. Ballast recycling: After the overall hoisting of the rails is completed, the ballast under the hoisting is manually cleaned. During the cleaning process, it is strictly forbidden to over-excavate the underlying base. After cleaning, the ballast is transported to the mixing station and verified by test mix ratio before being used for asphalt surface layer or water-stable base paving construction; S5, Cold patch filling: After the rails are hoisted manually and the construction area is manually cleaned, the road is temporarily repaired by paving graded crushed stone + cold patch asphalt on site; S6. Reuse of hoisted and cut materials: After the rails are hoisted and transported to the material storage area, they are partially trimmed and processed, and the trimmed cut materials are transported to the site as assembled access roads; S7. Road restoration: After the removal of the entire section of rails, the laid cold patch asphalt material will be milled and restored according to the original road structure layer design.

2. The method for dismantling existing railways under complex municipal road operation conditions as claimed in claim 1, characterized in that: In S1, the construction fence adopts assembled painted fence.

3. The method for dismantling existing railways under complex municipal road operation conditions as claimed in claim 1 or 2, characterized in that: In S2, before cutting, the existing rails are investigated in detail to clarify the structural layer of the rails crossing the road, as well as the foundation strength and thickness information. Based on this information, the sidewalks or non-motorized vehicle lanes are used to cut test sections at locations with less impact on traffic operations to determine the cutting parameters.

4. The method for dismantling existing railways under complex municipal road operation conditions as claimed in claim 1 or 2, characterized in that: In S3, to ensure smooth lifting, a 15cm wide cutting seam is cut around the cutting seam to reduce obstacles to lifting.

5. The method for dismantling existing railways under complex municipal road operation conditions as claimed in claim 1 or 2, characterized in that: In S5, graded gravel is paved using a small manual roller in conjunction with machinery for compaction, with the compaction degree controlled above 93%. The graded gravel is filled to 30 cm from the road surface.

6. The method for dismantling existing railways under complex municipal road operation conditions as claimed in claim 1 or 2, characterized in that: In S5, medium-grained AC-16 modified cold patch asphalt is used for temporary surface paving on site. The potholes are cleaned before paving. After cleaning, emulsified asphalt cold primer is used for artificial base coating. After drying, the potholes are filled in layers and compacted layer by layer. The layer thickness is controlled at 3-5cm. When filling the top layer of asphalt, fill enough asphalt into the potholes until the asphalt protrudes 1.3-1.6cm above the ground. After filling, the center of the pothole is slightly higher than the surrounding road surface and is arc-shaped.

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