Method for removing frame bridge under railway without interrupting traffic

Abstract

The application discloses a kind of under-crossing railway frame bridge dismantling method under the condition of uninterrupted traffic, comprising: sub-dismantling frame bridge, first close half frame bridge road in it, and the other half frame bridge road is normal traffic, and the frame bridge that has been closed is cut in turn and then is slid and pulled to line outside in turn, until the dismantling of the closed half frame bridge is completed, the other half frame bridge is closed according to the above mode, and is dismantled according to the same method, until the dismantling of all frame bridges is completed.The application solves the problem of high safety risk of under-crossing railway frame bridge dismantling, ensures the smooth traffic of highway in early stage, speeds up the dismantling efficiency, and reduces the influence on operating line and highway.

Description

Technical Field

[0001] This invention relates to the field of civil engineering bridge construction. More specifically, this invention relates to a method for dismantling a frame bridge under a railway without disrupting traffic. Background Technology

[0002] With the rapid development of my country's economy and society, some of the early-built four-lane expressways are experiencing traffic saturation and severe transportation capacity shortages. Their capacity and service levels have declined, failing to adequately meet the needs of economic and social development and urban and rural construction. Expressway reconstruction and expansion has become an important and urgent task in my country's transportation infrastructure construction. Expressway reconstruction and expansion projects generally require "uninterrupted service and no reduction in tolls," especially the demolition and reconstruction of expressway bridges and culverts intersecting with existing railway bridges. These projects require the completion of bridge demolition, debris removal, protection, and new construction within the shortest possible time and limited working area.

[0003] The demolition and reconstruction of a frame bridge under a railway is quite complex. Because the railway track bed rests directly on the bridge structure, demolishing the frame bridge would inevitably have a significant impact on the railway's operational lines. Furthermore, during highway reconstruction and expansion, there are requirements to maintain traffic flow, limiting the work area and making the demolition of the frame bridge extremely risky. Existing methods such as in-situ demolition cannot meet the requirements for maintaining traffic flow, and are also inefficient, causing significant impact on the railway and the underpass highway, thus failing to meet the construction requirements of this application. Summary of the Invention

[0004] One objective of this invention is to provide a method for dismantling a railway underpass frame bridge without interrupting traffic, thereby solving the problem of high safety risks in the dismantling of railway underpass frame bridges, ensuring smooth traffic flow on highways in the early stages, accelerating the dismantling efficiency, and reducing the impact on operating lines and expressways.

[0005] To achieve these objectives and other advantages of the present invention, a method for dismantling a frame bridge under a railway without disrupting traffic is provided, comprising: dismantling the frame bridge in sections, first closing one half of the frame bridge roadway while allowing normal traffic on the other half, repeating the process of cutting the closed frame bridge into sections in sequence, and then sliding and pulling the sections out of the track in sequence until the dismantling of the closed half of the frame bridge is completed, closing the other half of the frame bridge in the same manner, and dismantling it in the same way until the dismantling of all frame bridges is completed.

[0006] Preferably, after the road corresponding to one half of the frame bridge is closed, the railway support system is constructed under the closed frame bridge, or all railway support systems under both frame bridges are constructed at once, and the railway support system is transferred from the frame bridge to the railway support system, thereby relieving the constraints on the top slab of the frame bridge.

[0007] Preferably, before cutting and sliding the frame bridge into sections, the corresponding roadbed wing walls and ancillary structures are removed to release the constraints of the frame bridge side walls, and space is reserved for installing the side wall removal and sliding system. The side wall removal and sliding system is used to slide the cut frame bridge sections from the side of the frame bridge to outside the track.

[0008] Preferably, the sidewall demolition and sliding system includes a sidewall slide rail, a sidewall sliding traction jack, and a sidewall sliding traction cable. The sidewall slide rail is used for sliding the cut frame bridge sections, and the sidewall sliding traction jack is used to slide and pull the cut frame bridge sections connected to the sidewall sliding traction cable to outside the frame bridge line.

[0009] Preferably, the process involves repeatedly cutting the enclosed frame bridge into sections, and then sliding and pulling it out of the track section by section. This process specifically includes the following steps:

[0010] First, a temporary support system was erected inside the frame bridge, and a temporary sliding traction system was erected on the outside of the frame bridge along the bridge direction.

[0011] Secondly, the connection between the closed half-frame bridge and the middle wall is cut at the edge of the middle wall to form two longitudinal joints, thus releasing the constraints of the half-frame bridge.

[0012] Next, the connection between the top slab and the side wall of the closed half-frame bridge is cut to form a longitudinal joint, and the constraint between the top slab and the side wall is released. The side wall is cut in sections from top to bottom to form a transverse joint. The cut side wall is divided into free segments, and the divided free segments of the side wall are moved to the side wall removal and sliding system on the side wall. The free segments of the side wall are then slid outside the line through the side wall removal and sliding system.

[0013] Then, the roof slab, either as a whole or cut into multiple free segments, is pulled to the outside of the line using a temporary sliding traction system and lifted away.

[0014] Finally, the temporary support system was dismantled and the temporary sliding traction system was lowered to be level with the bottom slab. The bottom slab was then dismantled in the same way as the top slab, completing the dismantling of the half-width frame bridge.

[0015] Preferably, except for the base plate, the remaining structural sections of the frame bridge are cut using a wire saw, while the base plate is cut directly using a butterfly saw.

[0016] Preferably, the temporary sliding traction system includes a temporary support frame, temporary traction jacks, and temporary traction cables. The temporary support frame is used to support and install the temporary traction jacks and temporary traction cables, and its height is set to be flush with the bottom plate or top plate. The temporary traction jacks are used to slide and pull the cut frame bridge top plate connected to the temporary traction cables to the outside of the frame bridge track in sections.

[0017] Preferably, when dismantling the other half of the frame bridge, the central wall is also dismantled before the bottom slab is dismantled, and the dismantling method is the same as that for the side walls.

[0018] The present invention has at least the following beneficial effects:

[0019] 1. This invention removes the constraints between the railway subgrade and the frame bridge through a railway support system, solving the technical problem of railway interruption and impact on railway operation caused by the demolition of the underpass frame bridge. Furthermore, by transforming the support system, the impact of the frame bridge demolition on railway operation is further reduced.

[0020] 2. This invention involves dismantling the frame bridge in sections to ensure passage through the underpass, further reducing the impact on the operation of the underpass.

[0021] 3. The present invention adopts a segmented cutting and sliding method to cut the frame bridge into several large segments along the longitudinal and transverse directions, and removes them by sliding and traction. The demolition method involved in the present invention is safe and reliable, and greatly saves the time of closing half of the highway and reduces the impact on the operation of the underpass. A frame bridge can be removed in half a month.

[0022] 4. The demolition method of the present invention is efficient, safe and reliable, and has good application prospects. It shows good technical characteristics and superior economic performance, and has great promotional value.

[0023] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0024] Figure 1 This is a plan view of the railway support system distribution of the present invention;

[0025] Figure 2 This is a plan view of the dismantling process of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure for releasing the constraints of the semi-frame bridge according to the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the present invention, which involves the segmented demolition of the segmented sliding sidewalls.

[0028] Figure 5 This is a schematic diagram of the structure of the modular dismantling and sliding top plate of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the modular dismantling and sliding base plate of the present invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0031] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] This invention provides a method for demolishing a frame bridge under a railway without disrupting traffic. The main construction steps include: traffic diversion, closure of the road on the side to be demolished first, construction of the railway support system on the side to be demolished first → railway support system system conversion → demolition of the foundation wall and ancillary structures of the frame bridge on the side to be demolished first → erection of a temporary support system for the frame bridge → release of constraints on the half-frame bridge → segmented demolition of the sliding side walls → segmented demolition of the sliding top slab → demolition of the bottom slab → traffic diversion, closure of the road on the side to be demolished later, construction of the railway support system on the side to be demolished later → railway support system system conversion → demolition of the foundation wall and ancillary structures of the frame bridge on the side to be demolished later → erection of a temporary support system for the frame bridge → release of constraints on the half-frame bridge → segmented demolition of the sliding side walls → segmented demolition of the sliding top slab → segmented demolition of the sliding middle wall → segmented demolition of the relocated bottom slab.

[0033] The method for dismantling frame bridges in this invention mainly involves dismantling them in sections and then pulling them off the railway line in segments. This method is faster than existing methods such as in-situ dismantling, while having less impact on railway operations and shortening the road closure time for underpasses. Compared to existing in-situ dismantling methods, the dismantling time for a single frame bridge is reduced by nearly half a month. This method ensures the smooth and stable operation of the railway line during the dismantling of frame bridges passing under existing railway bridges, thereby guaranteeing railway traffic safety, while simultaneously maintaining traffic flow and ensuring the smooth passage of highway traffic.

[0034] This method can be used for the demolition of frame bridges where temporary access roads are set up outside the highway alignment. It can also be used for the demolition of frame culverts where highways pass under other highways, railways pass under other railways, or railways pass under highways.

[0035] The specific steps of the invention's method for dismantling a frame bridge under a railway without disrupting traffic are as follows:

[0036] Step 1: As Figure 1As shown, traffic diversion, closure and demolition of the side road first, and construction of railway support system 3.

[0037] The railway support system 3 is constructed in two phases. First, the side railway support system is dismantled, and then the side frame bridge 1 is dismantled. After this is completed, the side railway support system is dismantled again, followed by the side frame bridge 2. Alternatively, the railway support systems 3 on both sides of the frame bridge can be constructed in one go.

[0038] The railway support system 3 includes a horizontal lifting beam 3.1 that is inclined or perpendicular to the railway line, a D-shaped temporary beam 3.2 that is parallel to the railway line, and manually excavated piles 3.3 that support the horizontal lifting beam and the D-shaped temporary beam. For railway support systems 3 located far from the frame bridge on both sides of the railway, where the load-bearing capacity requirements are not high, the manually excavated piles 3.3 can be shorter, and the horizontal lifting beam 3.1 may not be required.

[0039] Step 2: Railway support system conversion. First, dismantle the side railway support system 3. After the construction is completed, support the railway track onto the railway support system 3.

[0040] After the construction of each side's railway support system is completed, before the frame bridge is dismantled, the railway track will be transferred from being supported on the top of the frame bridge and the roadbed to being supported on the railway support system 3, thus releasing the constraint of the top slab of the frame bridge 1 to be dismantled first.

[0041] When a railway line is rerouted by installing a temporary access road outside the line, the construction of a railway subgrade support system is not required.

[0042] Step 3: As Figure 2 As shown, the side frame bridge's V-shaped wall 5 should be demolished first.

[0043] Using a small excavator or manual labor, the 5-shaped wall and the corresponding foundation structure are demolished to release the constraint of the side wall of the first demolished side frame bridge 1, and the relevant earthwork is cleared to leave space for the sliding track 4.1 of the first demolished side wall, and the first demolished side wall demolition sliding system 4 is installed.

[0044] The sidewall demolition sliding system 4 includes a sidewall sliding track 4.1, a sidewall sliding traction jack 4.2, and a sidewall sliding traction cable 4.3. The segmented frame bridge sections are moved onto the sidewall sliding track 4.1 and connected to the sidewall sliding traction cable 4.3. The sidewall sliding traction jack 4.2 pulls the sections outside the line, thus achieving the traction demolition of the frame bridge sections.

[0045] Step 4: Erect a temporary support system 1.1 for the side frame bridge 1 that has been dismantled first.

[0046] A temporary support system for the frame bridge is constructed to ensure the stability of the bridge spans during dismantling. This involves installing a temporary sliding support frame 1.2 for initial dismantling, along with temporary traction jacks 1.3 and temporary traction cables 1.4. The temporary support frame 1.2 supports the temporary traction jacks 1.3 and traction cables 1.4 to a height flush with the top slab; it can be a support frame or similar structure. The temporary traction jacks 1.3 and traction cables 1.4 connect the top and bottom slabs, sliding and pulling them off the track for hoisting and dismantling. During bottom slab dismantling, the temporary support frame 1.2 is lowered to be flush with the bottom slab; it can be a slab or lattice beam structure for support.

[0047] Step 5: As Figure 3 As shown, the constraints of the first half of the secondary frame bridge are released.

[0048] Drill a row of holes spaced 1m apart with a diameter of 100mm along the inner edge of the middle wall on the top plate of the first demolished side frame bridge 1. Insert a wire saw and start the wire saw cutting machine to cut a longitudinal slit 1.5 on the top plate. Use a disc saw to cut a longitudinal slit 1.6 at the bottom of the first demolished side frame bridge 1 near the inner edge of the middle wall, thus completing the release of the constraints of the first demolished side half frame bridge.

[0049] The spacing of the holes is set according to the cutting capacity of the wire saw. The hole diameter is set to ensure that the wire saw chain can pass through, and the spacing is set to ensure the cutting distance of the wire saw. Since the foundation is below the bottom plate of the frame bridge, it is difficult to insert a wire saw. Therefore, a butterfly saw is used to cut directly to the bottom of the bottom plate, while wire saw cutting requires passing through two holes to make a cut, which is not suitable.

[0050] Step Six: As Figure 4 As shown, the sliding sidewalls are demolished in sections.

[0051] Drill a row of holes spaced 1m apart and 100mm in diameter along the inner edge of the side wall on the top plate (the setup is based on the same principle as above). Insert a wire saw, start the wire saw cutting machine, and cut a longitudinal slit of 1.7mm into the top plate to release the constraint between the top plate and the side wall. Drill a row of holes spaced 1m apart and 100mm in diameter along the sidewall direction at a certain distance from the top, for example, 2m away. Insert a wire saw and cut a horizontal slit 1.8 into the sidewall to form a free segment 1.9. Transfer the free segment 1.9 onto the sidewall demolition sliding system 4 of the side plate sliding channel. Using the sidewall sliding traction jack 4.2 and the sidewall sliding traction cable 4.3, slide the free segment 1.9 longitudinally along the sidewall slide rail 4.1 to the outside of the frame bridge line and transport it out. Repeat the cutting of the sidewall at 2m intervals along the sidewall direction to form a horizontal slit 1.8 and form a free segment 1.9. Place it on the sidewall slide rail 4.1, connect the sidewall sliding traction cable 4.3, start the sidewall sliding traction jack 4.2, and slide the free segment 1.9 until the sidewall demolition of the bottom plate is completed.

[0052] Step Seven: As Figure 5 As shown, the sliding top plate is dismantled in sections.

[0053] Drill a row of 100mm holes spaced 1m apart along the longitudinal third line of the top slab, insert a wire saw, and start the wire saw cutting machine to cut a longitudinal slit 1.10 in the top slab, forming three free segments. First, connect the middle block 1.12 to the temporary traction cable 1.4, start the temporary traction jack 1.3, and slide the middle block 1.12 longitudinally to the outside of the frame bridge line, then hoist it out. Then, slide the side blocks 1.11 on both sides laterally to the position of the middle block 1.12 in sequence, and then slide the side blocks 1.11 longitudinally to the outside of the frame bridge line, then hoist it out, until the top slab is completely removed.

[0054] Due to the setting of the railway support system 3, the sliding temporary support frame 1.2 is located between the two horizontal lifting beams 3.1, which is exactly at the position corresponding to the middle block 1.12. Therefore, the two side blocks 1.11 that are not located directly opposite the sliding temporary support frame 1.2 need to be cut so that they can be moved laterally to the position of the middle block 1.12 and then slid out longitudinally.

[0055] Step 8: As Figure 6 As shown, the base plate is dismantled and relocated in sections.

[0056] The base plate was cut into sections using a disc saw, and the cut sections were moved off-line using the sidewall removal sliding system 4. The temporary support system 1.1 and temporary support frame 1.2 were dismantled. The temporary traction cable 1.4 and temporary traction jack 1.3 were installed at the base plate elevation. Three longitudinal slits 1.13 were cut along the three-part division line of the base plate using a disc saw, forming three free segments 1.14. The middle free segment 1.14 was connected to the temporary traction cable 1.4. The temporary traction jack 1.3 was activated to slide the middle free segment 1.14 off-line for removal. The two side free segments 1.14 were then slid laterally to the middle position, connected to the temporary traction cable 1.4, and the temporary traction jack 1.3 was activated to slide the side free segments 1.14 off-line for removal. This completed the removal of the first frame bridge 1.

[0057] Step Nine: Traffic diversion, removal of the side road after closure, removal of the side railway support system after construction, same as Step One.

[0058] Step 10: Transformation of the railway support system, same as Step 2.

[0059] Step 11: After demolition, remove the side frame bridge 2 V-shaped wall, as in Step 3.

[0060] Step 12: Construct a temporary support system for the frame bridge, as in Step 4.

[0061] Step 13: Release the constraints on the half-frame bridge, same as in Step 5.

[0062] Step Fourteen: Demolish the sliding sidewalls in sections, as in Step Six.

[0063] Step 15: Remove the segmented sliding top plate in sections, as in Step 7.

[0064] Step 17: Demolish the central wall, using the same method as the side wall demolition.

[0065] Drill a row of holes spaced 1m apart and 100mm in diameter along the central wall at a certain distance from the top, for example, 2m away. Insert a wire saw through the holes and cut the central wall to form a horizontal slit. Transfer the cut block onto the demolition sliding system of the side panel sliding channel. Slide the block longitudinally to the outside of the frame bridge line and transport it out. Repeat the process of demolishing and sliding the block along the central wall in 2m increments until the bottom plate is reached, thus completing the demolition of the central wall.

[0066] Step Sixteen: Dismantle and relocate the base plate in sections, as in Step Eight.

[0067] The top slab can be moved out of the line without being cut into blocks or cut into several blocks, the side walls and middle walls can be moved out of the line without being cut into blocks, or the top slab, side walls and middle walls can be moved out of the line without being cut into blocks.

[0068] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for removing a railway frame bridge under the condition of uninterrupted traffic, characterized in that, include: The frame bridge is dismantled in sections. First, one half of the frame bridge is closed, while the other half remains open to traffic. This process is repeated, cutting the closed sections of the frame bridge into sections and then sliding and pulling them off the road in sections until the dismantling of the closed half is complete. The other half of the frame bridge is closed in the same way and dismantled in the same manner until the dismantling of all the frame bridges is completed. After the road corresponding to one half of the frame bridge is closed, the railway support system is constructed under the closed frame bridge, or all the railway support systems under both half of the frame bridge are constructed at one time, and the railway support system is transferred from the frame bridge to the railway support system, thus relieving the constraints on the top slab of the frame bridge. The process of repeatedly cutting the enclosed frame bridge into sections and then sliding and pulling it out of the track in sections includes the following steps: First, a temporary support system was erected inside the frame bridge, and a temporary sliding traction system was erected on the outside of the frame bridge along the bridge direction. Secondly, the connection between the closed half-frame bridge and the middle wall is cut at the edge of the middle wall to form two longitudinal joints, thus releasing the constraints of the half-frame bridge. Next, the connection between the top slab and the side wall of the closed half-frame bridge is cut to form a longitudinal joint, and the constraint between the top slab and the side wall is released. The side wall is cut in sections from top to bottom to form a transverse joint. The cut side wall is divided into free segments, and the divided free segments of the side wall are moved to the side wall removal and sliding system on the side wall. The free segments of the side wall are then slid outside the line through the side wall removal and sliding system. Then, the roof slab, either as a whole or cut into multiple free segments, is pulled to the outside of the line using a temporary sliding traction system and lifted away. Finally, the temporary support system was dismantled and the temporary sliding traction system was lowered to be level with the bottom slab. The bottom slab was then dismantled in the same way as the top slab, completing the dismantling of the half-width frame bridge.

2. The method of claim 1, wherein, Before cutting and sliding the frame bridge into sections, the corresponding roadbed wing walls and ancillary structures are removed to release the constraints of the frame bridge side walls, and space is reserved for installing the side wall removal and sliding system. The side wall removal and sliding system is used to slide the cut frame bridge sections from the side of the frame bridge to outside the line.

3. The method of claim 2, wherein the method is characterized by, The sidewall demolition and sliding system includes a sidewall slide rail, a sidewall sliding traction jack, and a sidewall sliding traction cable. The sidewall slide rail is used for sliding the cut frame bridge sections, and the sidewall sliding traction jack is used to slide and pull the cut frame bridge sections connected to the sidewall sliding traction cable to outside the frame bridge line.

4. The method of claim 1, wherein, Except for the base plate, the remaining structural sections of the frame bridge were cut using wire saws, while the base plate was cut directly using a disc saw.

5. The method of claim 1, wherein, The temporary sliding traction system includes a temporary support frame, temporary traction jacks, and temporary traction cables. The temporary support frame is used to support and install the temporary traction jacks and temporary traction cables, and its height is set to be flush with the bottom plate or top plate. The temporary traction jacks are used to slide and pull the cut frame bridge top plate connected to the temporary traction cables to the outside of the frame bridge track in sections.

6. The method of claim 1, wherein the method is performed without interrupting traffic. The demolition of the other half of the frame bridge also includes the demolition of the central wall before the removal of the bottom slab, and the demolition method is the same as that for the side walls.

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