Construction method for dismantling existing structure of open cut new line transfer station

Abstract

The invention relates to the technical field of subway construction, and discloses a construction method for dismantling an existing structure of an open cut new line transfer station, which comprises the following steps of: dividing a transformation area on a longitudinal upturning beam of a bottom plate of an existing operation subway station through a totally-closed fireproof enclosure, and assembling a semi-automatic walking type hoisting truss and a fixed type hoisting truss in a line outage period; a matched channel steel guide rail is laid, and the fixed truss is arranged at a reserved hoisting hole of a new line; and then existing structure blocks in a transformation area are cut, hoisting holes are formed, concrete cutting blocks are horizontally moved to reserved hoisting hole positions through a walking type truss, then the concrete cutting blocks are lowered to a newly-built station transfer point through a fixed type truss, and outward transportation is completed. Double trusses are adopted for cooperative operation, stable transfer of the concrete cutting blocks in the vertical direction and the horizontal direction is achieved, potential safety hazards and operation problems of existing structure dismantling in the closed narrow environment are effectively solved, the dismantling efficiency is remarkably improved on the premise that construction safety is guaranteed, and the interference degree of construction on existing subway operation is reduced.

Description

Technical Field

[0001] This invention relates to the field of subway construction technology, specifically to a method for demolishing existing structures at transfer stations on new open-cut subway lines. Background Technology

[0002] With the continuous development of urban rail transit, many cities are facing the need for double-line or even triple-line transfers in their rail transit construction. Currently, the demolition of existing operating line stations for transfer renovations often involves manual pneumatic hammer demolition combined with static cutting. The traditional method of moving, lowering, and transporting concrete demolition components is usually done by laying old rubber tires directly under the components and then manually prying them off with steel chisels. However, the construction area of ​​existing operating subway stations is in a closed and narrow confined space. Traditional construction methods not only pose significant safety hazards and are prone to accidents, but also have the problems of high difficulty in manually moving concrete components, low construction efficiency, and high costs. This makes it difficult to ensure the safe and stable operation of existing subway lines and the efficient progress of transfer renovation projects. Summary of the Invention

[0003] To address the safety hazards and potential accidents associated with construction in the enclosed and narrow environments of existing operating line stations, this invention aims to provide a method for demolishing existing structures at new line transfer stations using open-cut construction. This method integrates semi-automatic traveling hoisting trusses and fixed hoisting trusses to facilitate the smooth demolition of the concrete structure of existing operating stations at transfer points between new and existing stations, and the vertical and horizontal movement of concrete cutting blocks. This avoids the difficulties and safety hazards of manually moving concrete cutting block components in enclosed and narrow environments, maximizing construction speed while ensuring safety.

[0004] This invention is achieved through the following technical solution: A method for demolishing the existing structure of a new railway line transfer station using the cut-and-cover method includes the following steps: Step 1: On the longitudinal uplift beam of the existing subway station floor slab, the renovation area is divided into sections using fully enclosed fireproof barriers; Step 2: During the line shutdown period, assemble the semi-automatic traveling hoisting truss and the fixed hoisting truss and lay the channel steel guide rails. The semi-automatic traveling hoisting truss is equipped with traveling wheels at the bottom, and the traveling wheels are matched with the channel steel guide rails laid in the renovation area. The fixed hoisting truss is arranged at the reserved hoisting hole position of the new line station. Step 3: Cut the existing structure in the renovation area into sections and create hoisting holes; Step 4: By driving the semi-automatic walking hoisting truss to move, the concrete cutting block cut in Step 3 is moved to the reserved hoisting hole position, and then the concrete cutting block is hoisted and lowered to the transfer point of the new station by the fixed hoisting truss to complete the overall transportation.

[0005] In this solution, a fully enclosed fireproof barrier physically isolates the construction area from the existing operating station, preventing disruption to normal subway operations. Simultaneously, the coordinated operation of semi-automatic and fixed hoisting trusses, along with channel steel guide rails and wheels, enables mechanized transport, effectively replacing the outdated methods of manual demolition with pneumatic picks and the removal of fallen steel bars. This minimizes the safety hazards of manually handling concrete components in enclosed, narrow, and confined spaces, reducing construction safety risks. Furthermore, this method allows for the rational segmentation and cutting of the existing structure according to hoisting weight limits. Combined with pre-hoisting fixation and static wire saw cutting, this significantly improves the size of individual concrete blocks and demolition efficiency, reducing labor input and construction costs. The truss utilizes a modular prefabrication and rapid on-site assembly model, allowing for construction to proceed during line downtime, maximizing the reduction of the construction period and accelerating the overall progress of the new line and existing line transfer and renovation project. This achieves safe, efficient, and low-interference demolition and removal of existing structures.

[0006] As a further solution to the existing structural demolition construction methods, in order to solve the problem that integral trusses cannot be transported and installed on site, both the semi-automatic walking hoisting truss and the fixed hoisting truss are prefabricated components in units, and each unit is quickly assembled by flanges and bolts.

[0007] As a further solution to the existing structural demolition construction method, the semi-automatic walking hoisting truss is equipped with movable round steel lifting rings and electric guide chains on the main hoisting beam. The electric guide chains are connected to the hoisting holes on the concrete cutting blocks through hoisting belts, so that the concrete cutting blocks can be vertically raised and lowered and horizontally finely adjusted with the semi-automatic walking hoisting truss. This can be adapted to the closed and narrow restricted construction space of existing operating subway stations, eliminating the need for manual movement of heavy objects throughout the process, thus eliminating the safety hazards of manually transporting components in confined spaces from the source. At the same time, it can flexibly and smoothly adjust the spatial posture and position of the concrete cutting blocks, avoiding collisions with the existing station structure and construction fences during the transportation process.

[0008] As a further solution to the existing structural demolition construction methods, the semi-automatic walking hoisting truss is assembled from I-beam columns, channel steel braces, and a hoisting main crossbeam. The bottom of the I-beam columns is equipped with walking wheels, and the hoisting main crossbeam is equipped with round steel lifting rings, electric guide chains, and hooks. Each component is fixed by connecting steel plates and connecting bolts. The modular assembly of steel sections combined with bolt connection eliminates the need for on-site hot welding. This method is suitable for working in the confined space of existing operating stations and meets the construction needs of rapid assembly during short-term shutdowns at night, reducing on-site construction risks and assembly difficulties.

[0009] As a further solution to the existing structural demolition method, in step 3, before cutting, the concrete block is pre-suspended and fixed to the electric guide chain by passing the hoisting belt through the hoisting hole, and then statically cut with a wire saw. This allows the concrete block to remain in a controlled suspended state throughout the entire cutting process, eliminating the safety hazards caused by accidental falling, slipping, or tipping of the concrete block after cutting in enclosed and narrow construction spaces, and fully ensuring the safety of construction personnel and the integrity of the existing operating station structure and equipment. At the same time, the pre-suspension and fixation combined with static cutting can reduce the vibration and impact generated by the cutting operation and avoid disturbing the operation of the existing subway line.

[0010] As a further solution to the existing structure demolition construction method, in step 3, the existing structure is divided into blocks according to the rated lifting weight limit line of the semi-automatic walking hoisting truss, and each concrete cutting block is numbered sequentially to determine the cutting order. This ensures that the weight and size of each concrete cutting block match the load-bearing capacity of the hoisting equipment, guaranteeing construction safety in enclosed and narrow spaces. At the same time, orderly numbering and cutting allows the demolition work to proceed step by step according to plan, avoiding disorderly cutting that causes on-site chaos and component accumulation. Reasonable block size can also reduce the number of cutting operations and manual operation, effectively shortening the demolition cycle of a single component.

[0011] As a further solution to the existing structural demolition construction method, the hoisting holes and rope saw holes of the concrete cutting blocks are formed by water drilling, which can minimize the vibration disturbance of drilling construction to the existing operating subway station structure and operating equipment.

[0012] As a further solution to the existing structural demolition construction method, after the concrete cutting block is moved to the reserved hoisting hole position, the fixed hoisting truss independently completes the vertical lowering operation. This can realize the functional division and collaborative operation of the semi-automatic walking hoisting truss and the fixed hoisting truss, effectively avoiding the collision risk and safety hazards caused by the cross-operation of multiple equipment.

[0013] As a further solution to the existing structural demolition construction method, the fixed hoisting truss includes a fixed hoisting truss beam (14) and a fixed hoisting truss inclined support beam connected to both ends of the fixed hoisting truss beam. The fixed hoisting truss diagonal support beams located at the ends of the fixed hoisting truss crossbeams are arranged in pairs, and the fixed hoisting truss crossbeams are welded to the fixed hoisting truss diagonal support beams through connecting plates. The fixed hoisting truss diagonal support beams, along with the fixed hoisting truss longitudinal connecting steel bars, the fixed hoisting truss transverse connecting steel bars, and the fixed hoisting truss transverse connecting steel bars, form a stable hoisting support point. The hoisting support point guides the hoisting and lowering of the concrete cutting block through a drive assembly, and the rated load-bearing capacity of the fixed hoisting truss crossbeams is not less than the maximum hoisting load of the semi-automatic walking hoisting truss.

[0014] As a further solution to the existing structural demolition construction method, the fully enclosed fireproof enclosure completely physically isolates the renovation area from the non-construction area of ​​the existing operating station.

[0015] In summary, compared with the prior art, the present invention has the following main advantages and beneficial effects: 1. This invention adopts an integrated mechanized operation of semi-automatic walking hoisting trusses and fixed hoisting trusses to replace traditional methods such as manual handling and steel bar manipulation, eliminating safety hazards such as falls and collisions caused by manual operation in enclosed and narrow spaces from the source; in addition, the pre-hoisting and fixing of concrete cutting blocks before cutting can also effectively prevent components from falling or slipping accidentally. The entire static construction process is free from vibration and impact, effectively ensuring the safety of construction personnel and existing station structures and equipment; 2. During hoisting, the truss is standardized and numbered according to its rated weight limit, reducing the number of cutting and hoisting operations. Furthermore, the truss is prefabricated in units and quickly assembled on-site with bolts, making it suitable for short construction windows during subway shutdowns at night. Combined with the collaborative operation of the dual trusses, the transfer and connection are smooth, significantly shortening the overall demolition construction cycle. 3. This invention also achieves physical isolation between the construction area and the operation area through a fully enclosed fireproof enclosure. All component transportation, assembly and dismantling operations are completed during the line shutdown period. Static processes such as water drilling and wire sawing produce less dust, less noise and no open flame, minimizing the interference of construction on the normal operation of existing subway lines. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 A clear plan view showing the cut and segmented layout of the base plate; Figure 2 The cut cross-sections of the base slab and platform slab are clearly defined. Figure 3 A schematic diagram of a semi-automatic traveling hoisting truss. Figure 4 Schematic diagram of the cross-section of the fixed hoisting truss; Figure 5 for Figure 4 Large detail diagram of node ①; Figure 6 for Figure 5 Large-scale drawing of node ②; Figure 7 for Figure 5 Large detail diagram of node ③; Figure 8 for Figure 5 Large-scale diagram of node ④.

[0017] The attached diagram shows the markings and corresponding component names: 1-Longitudinal upward-turning beam of station floor slab; 2-Fully enclosed fireproof enclosure; 3-Concrete cutting block; 4-Enclosure column; 5-Channel steel guide rail; 6-Semi-automatic walking hoisting truss; 7-Fixed hoisting truss; 8-Station floor slab; 9-Station platform slab; 10-Electric guide chain; 11-Walking wheel; 12-Round steel lifting ring; 13-Hoisting belt; 14-Fixed hoisting truss crossbeam; 15-Fixed hoisting truss diagonal support beam; 16-Fixed hoisting truss longitudinal connecting reinforcement; 17-Fixed hoisting lower truss transverse connecting reinforcement; 18-Fixed hoisting upper truss transverse connecting reinforcement; 19-I-beam column; 20-Channel steel diagonal brace; 21-Hoisting main crossbeam; 22-Electric guide chain host; 23-Guide chain steel rope; 24-Hook; 25-Distribution beam; 26-Connecting steel plate; 27-Connecting bolt. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention. Example

[0019] This embodiment 1 provides a method for demolishing the existing structure of a new line transfer station using the open-cut method, such as... Figure 1 As shown, a fully enclosed fireproof barrier 2 is first installed at the longitudinal upturned beam 1 position of the existing operating subway station floor 8. The fully enclosed fireproof barrier 2 is fixed to the station floor 8, forming a closed and independent renovation area. The renovation area is completely physically isolated from the non-construction and operation area of ​​the station by the fully enclosed fireproof barrier 2, and the fully enclosed fireproof barrier 2 is reinforced by the barrier columns 4, so that the construction can be prevented from interfering with the operation area.

[0020] After the renovation area is divided, the semi-automatic walking hoisting truss 6 and the fixed hoisting truss 7 are assembled on site during the line shutdown period, and the channel steel guide rail 5 is laid. The semi-automatic walking hoisting truss 6 and the fixed hoisting truss 7 work together. All components of the truss are prefabricated in the factory in units. Flanges and connecting bolts 27 and connecting steel plates 26 are used between units to achieve rapid on-site assembly without the need for on-site hot welding.

[0021] Specifically, such as Figure 2 and Figure 3As shown, the main body of the semi-automatic traveling hoisting truss 6 is assembled from I-beam columns 19, channel steel braces 20, and hoisting main crossbeams 21 erected on both sides of the renovation area. Among them, distribution beams 25 are set between the I-beam columns 19 on both sides and the hoisting main crossbeams 21. The upper end of the distribution beams 25 is connected to the hoisting main crossbeams 21 through connecting steel plates 26 and connecting bolts 27, and the lower end of the distribution beams 25 is welded to the I-beam columns 19. In order to enhance the support strength between the I-beam columns 19 and the hoisting main crossbeams 21, channel steel braces 20 are connected between the I-beam columns 19 and the hoisting main crossbeams 21.

[0022] In this embodiment, the bottom of the above-mentioned I-beam column 19 is also equipped with a traveling wheel 11. The traveling wheel 11 is matched and placed in the channel steel guide rail 5. The channel steel guide rail 5 is laid along both sides of the renovation area, so as to realize that the truss can move back and forth along the guide rail and transport the concrete cutting blocks in the renovation area in the vertical and horizontal directions.

[0023] Meanwhile, the aforementioned main lifting beam 21 is equipped with a round steel lifting ring 12 and an electric guide chain 10; the electric guide chain 10 is connected to the concrete cutting block 3 through the lifting belt 13 to realize the vertical lifting and horizontal fine adjustment of the concrete cutting block 3; specifically, the electric guide chain 10 includes an electric guide chain host 22, a guide chain steel rope 23 and a hook 24. The two ends of the electric guide chain host 22 are respectively connected to a guide chain steel rope 23, and the free ends of the guide chain steel rope 23 are all connected to hooks 24. One hook 24 is connected to the round steel lifting ring 12, and the other hook 24 is connected to the lifting belt 13.

[0024] In this embodiment, when the semi-automatic traveling hoisting truss 6 is working, it first relies on the channel steel guide rail 5 pre-laid on the station floor 8, and moves longitudinally back and forth along the guide rail through the traveling wheels 11 at the lower end of the bottom I-beam column 19. It is a stable load-bearing structure assembled by the I-beam column 19, channel steel diagonal brace 20 and hoisting main crossbeam 21 through connecting steel plate 26 and connecting bolt 27. The hoisting main crossbeam 21 is equipped with a round steel lifting ring 12 that can slide laterally, an electric guide chain 10 and matching hooks 24 and distribution beam 25. Before operation, the hoisting belt 13 is passed through the water-drilled hoisting hole of the concrete cutting block 3 and hooked to the hook 24. The electric guide chain 10 is started to pre-lift and tighten the concrete cutting block 3, keeping the concrete cutting block 3 in place. During the entire static cutting process of the wire saw, the concrete block 3 is in a controlled suspended state. After the cutting is completed and separated, the electric guide chain 10 is used to vertically lift the concrete block 3 to a safe height off the ground. Then, the truss is moved longitudinally along the channel steel guide rail 5 by the traveling wheels 11, and the round steel lifting ring 12 is used to make slight lateral adjustments along the main lifting beam 21 to achieve stable displacement of the concrete block 3 in three-dimensional space until the concrete block 3 is moved to the reserved lifting hole position of the new line station. Then, it is handed over to the fixed lifting truss 7 to complete the vertical lowering operation. After the handover, the semi-automatic traveling lifting truss 6 returns to the initial working position along the channel steel guide rail 5 and enters the lifting cycle of the next concrete block 3. The entire process is completed in the narrow space isolated by the fully enclosed fireproof enclosure 2.

[0025] Please refer to the following: Figures 4-8 As shown, the fixed hoisting truss 7 is arranged at the reserved hoisting hole position of the new line station, and includes a fixed hoisting truss crossbeam 14 and a pair of fixed hoisting truss inclined support beams 15.

[0026] like Figures 5-8 As shown, the fixed hoisting truss crossbeam 14 and the fixed hoisting truss diagonal support beam 15 are welded together by connecting plates; the fixed hoisting truss diagonal support beam 15, together with the fixed hoisting truss longitudinal connecting steel bar 16, the fixed hoisting lower truss transverse connecting steel bar 17 and the fixed hoisting upper truss transverse connecting steel bar 18, form a stable hoisting support point, which is arranged directly above the reserved hoisting hole of the new line station; at the same time, the rated load of the fixed hoisting truss crossbeam 14 is greater than or equal to the maximum hoisting load of the semi-automatic walking hoisting truss 6, and can independently complete the vertical placement of the concrete cutting block 3; In this embodiment, the fixed hoisting truss 7 is positioned directly above the hoisting hole reserved in the early structure of the new line station during operation. It is formed by welding and bolting together the fixed hoisting truss crossbeam 14, paired fixed hoisting truss diagonal support beams 15, and the fixed hoisting truss longitudinal connecting steel bars 16, the fixed hoisting lower truss transverse connecting steel bars 17, and the fixed hoisting upper truss transverse connecting steel bars 18 to create a stable, rigid hoisting support. After the semi-automatic traveling hoisting truss 6 smoothly moves the cut concrete block 3 to directly above the reserved hoisting hole, the fixed hoisting truss 7, using its matching hoisting components, receives the concrete block 3 and independently completes the vertical hoisting of the concrete block 3. The concrete cutting block 3 was lowered smoothly to the transfer point inside the new station. During the lowering process, the block was ensured to move without shaking, shifting, or falling, thanks to its stable structure and sufficient load-bearing capacity. After the block was lowered to the transfer point, a forklift and a truck crane were used to lift it to the ground outside the station, completing the demolition and transportation of the concrete structure in the enclosed and narrow construction environment. Finally, the fixed hoisting truss 7 was reset and kept in standby mode, waiting for the next hoisting and lowering operation. The entire process was coordinated and smoothly connected with the semi-automatic traveling hoisting truss 6, and the vertical transfer of the concrete cutting block 3 was safely completed in the enclosed and narrow construction environment of the existing operating station. Example

[0027] This embodiment 2, based on embodiment 1, provides another method for demolishing the existing structure of a new subway line transfer station using open-cut construction. First, at the location of the longitudinally raised beam 1 on the existing operating subway station's floor slab, a fully enclosed fireproof barrier 2 and barrier columns 4 are used to completely physically isolate the construction area from the station's operating area, creating a closed and safe working space. Then, during subway line shutdown periods, the prefabricated semi-automatic traveling hoisting truss 6 and fixed hoisting truss 7 components are transported to the site and connected via connecting steel plates 26 and connecting bolts. Bolt 27 was quickly assembled, and channel steel guide rails 5 matching the bottom traveling wheels 11 of the semi-automatic walking hoisting truss 6 were manually laid on the station floor 8 in the renovation area. At the same time, the fixed hoisting truss 7 was fixedly arranged directly above the hoisting holes reserved in the new line station structure, completing the installation and commissioning of the hoisting system. Then, according to the rated hoisting weight limit of the semi-automatic walking hoisting truss 6, the existing station floor 8 and station platform 9 were laid out, divided into blocks, and numbered. Hoisting holes were machined on each concrete cutting block 3 to be cut using water drilling technology. Before the wire saw static cutting operation, the lifting strap 13 is passed through the lifting hole of the concrete cutting block 3 and hooked onto the hook 24 of the electric guide chain 10 of the semi-automatic walking lifting truss 6. The electric guide chain 10 is started to pre-lift and tighten the concrete cutting block 3, so that it is always in a controlled suspended state throughout the cutting process. After the concrete cutting block 3 is separated from the original structure after cutting, the electric guide chain 10 is operated to vertically lift the concrete cutting block 3 to a safe height off the ground, and then it is lifted along the channel steel guide rail 5 by the traveling wheels 11 of the semi-automatic walking lifting truss 6. The concrete cutting block 3 is moved longitudinally and adjusted laterally by the sliding round steel lifting ring 12 on the main lifting beam 21. The concrete cutting block 3 is then smoothly moved to the reserved lifting hole position. The fixed lifting truss 7 then receives the concrete cutting block 3 and independently completes the vertical lifting and lowering operation of the concrete cutting block 3, smoothly lowering it to the transfer point inside the new station. Finally, the concrete cutting block 3 is transferred to the ground outside the station by a forklift and a truck crane to complete the external transportation. The semi-automatic traveling lifting truss 6 then returns to the initial working position and enters the next concrete cutting block 3 dismantling operation cycle according to the number sequence.

[0028] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for demolishing the existing structure of a transfer station on a new open-cut railway line, characterized in that, Includes the following steps: Step 1: On the longitudinal uplift beam (1) of the existing operating subway station floor, the renovation area is divided by a fully enclosed fireproof fence (2); Step 2: During the line shutdown period, assemble the semi-automatic walking hoisting truss (6) and the fixed hoisting truss (7) and lay the channel steel guide rail (5). The semi-automatic walking hoisting truss (6) is equipped with walking wheels (11) at the bottom. The walking wheels (11) match the channel steel guide rail (5) laid in the renovation area. The fixed hoisting truss (7) is arranged at the reserved hoisting hole position of the new line station. Step 3: Cut the existing structure in the renovation area into sections and create hoisting holes; Step 4: By driving the semi-automatic walking hoisting truss (6) to move, the concrete cutting block (3) cut in step 3 is moved to the reserved hoisting hole position, and then the concrete cutting block (3) is hoisted and lowered to the transfer point of the new station through the fixed hoisting truss (7) to complete the overall transportation.

2. The method for demolishing the existing structure of a new line transfer station using the open-cut method according to claim 1, characterized in that, Both the semi-automatic walking hoisting truss (6) and the fixed hoisting truss (7) are prefabricated components in sub-units, and each unit is quickly assembled by flanges and bolts.

3. The method for demolishing the existing structure of a new line transfer station using the open-cut method according to claim 1, characterized in that, The semi-automatic walking hoisting truss (6) has a movable round steel lifting ring (12) and an electric guide chain (10) on its main hoisting beam (21). The electric guide chain (10) is connected to the hoisting hole on the concrete cutting block (3) through the hoisting belt (13), so that the concrete cutting block (3) moves vertically up and down and is finely adjusted laterally with the semi-automatic walking hoisting truss (6).

4. The method for demolishing the existing structure of a new line transfer station using the open-cut method according to claim 3, characterized in that, The semi-automatic walking hoisting truss (6) is assembled from I-beam columns (19), channel steel bracing (20) and hoisting main crossbeam (21); the I-beam columns (19) are equipped with walking wheels (11) at the bottom, and the hoisting main crossbeam (21) is equipped with round steel lifting rings (12), electric guide chains (10) and hooks (24). Each component is fixed by connecting steel plates (26) and connecting bolts (27).

5. The method for demolishing the existing structure of a new line transfer station using the open-cut method according to claim 3, characterized in that, In step 3, before cutting, the concrete cutting block (3) is pre-lifted and fixed to the electric guide chain (10) by passing through the lifting hole with the lifting belt (13), and then static cutting with wire saw is performed.

6. The method for demolishing the existing structure of a new line transfer station using the open-cut method according to claim 1, characterized in that, In step 3, the existing structure is divided into blocks according to the rated lifting weight limit of the semi-automatic walking hoisting truss (6), and each concrete cutting block (3) is numbered sequentially to determine the cutting order.

7. The method for demolishing the existing structure of a new open-cut transfer station according to claim 1, characterized in that, The hoisting holes and rope saw holes of the concrete cutting block (3) are formed by water drilling.

8. The method for demolishing the existing structure of a new line transfer station using the open-cut method according to claim 1, characterized in that, After the concrete cutting block (3) is moved to the reserved hoisting hole position, the fixed hoisting truss (7) independently completes the vertical lowering operation.

9. The method for demolishing the existing structure of a new line transfer station using the open-cut method according to claim 1, characterized in that, The fixed hoisting truss (7) includes a fixed hoisting truss beam (14) and fixed hoisting truss inclined support beams (15) connected to both ends of the fixed hoisting truss beam (14). Among them, the fixed hoisting truss diagonal support beams (15) located at the ends of the fixed hoisting truss crossbeam (14) are arranged in pairs, and the fixed hoisting truss crossbeam (14) is welded to the fixed hoisting truss diagonal support beam (15) through a connecting plate. The fixed hoisting truss diagonal support beam (15) together with the fixed hoisting truss longitudinal connecting steel bar (16), the fixed hoisting lower truss transverse connecting steel bar (17) and the fixed hoisting upper truss transverse connecting steel bar (18) form a stable hoisting support point. The hoisting support point guides the hoisting and lowering of the concrete cutting block (3) through the drive assembly, and the rated load capacity of the fixed hoisting truss crossbeam (14) is not less than the maximum hoisting load of the semi-automatic walking hoisting truss (6).

10. The method for demolishing the existing structure of a new open-cut transfer station according to claim 1, characterized in that, The fully enclosed fireproof enclosure (2) completely physically isolates the renovation area from the non-construction area of ​​the existing operating station.

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