A method for dismantling and reinforcing a suspended work platform for a super high-rise fire corridor

Abstract

The present invention provides a method for erecting a suspended work platform for dismantling and reinforcing a corridor after a super-high-rise fire. The erection method comprises the following steps: step S1, conducting a survey based on plane control points and leveling points, and conducting a survey and laying out according to a building drawing; step S2, laying out a plurality of steel wire ropes under the corridor, with both ends of the steel wire ropes respectively fixedly connected to the twin towers of the building; step S3, carrying out construction of a first section of a cantilever platform; step S4, carrying out construction of a next section of a cantilever platform; step S5, repeating step S4 until the construction of the cantilever platform is completed, excavating side and bottom openings at corresponding positions of the existing corridor, forming a support system through longitudinal beams and hangers, and laying cross beams and steel springboards on the longitudinal beams, so as to form cantilever platforms on both sides of the corresponding corridor, thereby providing a construction space for corridor repair.

Description

Technical Field

[0001] The invention belongs to the technical field of building repair, and in particular relates to a method for dismantling a corridor after a super-high-rise fire and setting up a reinforced suspended working platform. Background Art

[0002] With the improvement of my country's urbanization, the construction industry has developed rapidly. For the requirements of building functions and aesthetics, corridors are a common style of modern super-high buildings. Corridors can facilitate the connection between the two towers. At the same time, the connected buildings have good lighting effects and a wide field of vision, and have excellent sightseeing and aesthetic performance. However, in the face of the restoration of some corridors damaged by fire, how to build a construction platform at a high distance from the ground and completely suspended has become a construction difficulty.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and the present invention provides a method for dismantling a corridor after a super-high-rise fire and for erecting a reinforced suspended working platform.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for dismantling and reinforcing a suspended work platform for a super high-rise fire corridor, the method comprising the following steps:

[0007] Step S1, taking the plane control points and level points as the reference for surveying, and measuring and laying out according to the building drawings;

[0008] Step S2, laying a plurality of steel wire ropes under the corridor, and the two ends of the steel wire ropes are respectively fixed to the twin towers of the building;

[0009] Step S3, constructing the first cantilever platform;

[0010] A longitudinal beam is set on the floor below the corridor. The longitudinal beam passes through the cantilever beam opening from the inside and is cantilevered outside. The end of the longitudinal beam located inside the building is fixed on the concrete floor slab.

[0011] Holes for the suspenders are drilled in the area of ​​the first cantilever platform corresponding to the floor slab of the corridor's ground floor for lowering and fixing the suspenders;

[0012] The longitudinal beam is fixedly installed by a suspender, and a steel springboard is laid on the longitudinal beam before setting the crossbeam. Both ends of the crossbeam extend out of the corridor, and a steel springboard is laid on the part of the crossbeam extending out of the corridor.

[0013] Step S4, carrying out the construction of the next cantilever platform;

[0014] The second section of the cantilever platform is constructed with a suspender on the bottom floor of the corridor. After the construction is completed, the longitudinal beam of the second section of the cantilever platform is connected to the longitudinal beam of the first section of the cantilever platform. After the longitudinal beam of the second end of the cantilever platform is fixed to the suspender, a steel springboard is laid, and the cross beam and the corresponding part of the steel springboard are laid;

[0015] Step S5, repeat step S4 until the cantilever platform construction is completed.

[0016] Preferably, the suspension rod comprises an upper rod section and a lower rod section, and the construction method comprises:

[0017] Extend the lower section of the rod from the hanger hole to the bottom of the corridor, adjust the elevation and construct the upper section of the rod after it is in place, fix the lower end of the upper section of the rod to the lower section, and then fix the upper section of the rod to the top steel secondary beam of the bottom layer.

[0018] Preferably, the lower end of the suspension rod is provided with an end cap corresponding to the longitudinal beam, and the end cap comprises:

[0019] A cross brace, which is fixedly connected to the lower end of the suspension rod and extends horizontally along a square perpendicular to the longitudinal beam;

[0020] The baffle is arranged at one end of the cross brace away from the suspension rod and extends upward to form a U-shaped placement station with the cross brace and the suspension rod.

[0021] Preferably, the longitudinal beam of the next cantilever platform is hinged with the longitudinal beam of the previous cantilever platform through a pin, driving the longitudinal beam of the next cantilever platform to rotate and fall on the U-shaped placement position of the hanger, and the longitudinal beam is welded and fixed to the hanger, and then the steel springboard is laid.

[0022] Preferably, in step S3, a steel tie rod is provided in the middle of the longitudinal beam, the upper end of the steel tie rod is fixed to the horizontal beam of the main truss of the floor below the corridor, and the lower end is fixed to the longitudinal beam.

[0023] Preferably, the construction of inter-column supports and horizontal supports is carried out after the construction of each section of the steel gangway is completed.

[0024] Preferably, both ends of the corridors corresponding to the twin towers of the building are provided with longitudinal beams cantilevered outwards, cantilever platforms are constructed from both ends of the corridors to the middle, and the corridors are connected in the middle.

[0025] Preferably, after the construction of the steel gangway of each cantilever platform is completed, a fireproof layer is laid, the fireproof layer comprising a steel mesh and a fireproof cloth.

[0026] Preferably, a plurality of observation points are provided on both sides of the cantilever platform, and the observation points include horizontal observation points and vertical observation points; the horizontal observation points and the vertical observation points are observed respectively by a theodolite and a level.

[0027] Beneficial effects: Openings are dug on the sides and bottom at the corresponding positions of the existing corridor, a support system is formed through longitudinal beams and hangers, and cross beams and steel springboards are laid on the longitudinal beams to form cantilevered platforms on both sides of the corresponding corridor, thereby providing construction space for corridor repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0029] Figure 1 A schematic structural diagram of the first cantilever in a specific embodiment provided by the present invention;

[0030] Figure 2 A construction diagram of the second cantilever in a specific embodiment provided by the present invention;

[0031] Figure 3 This is a schematic diagram of the cantilever platform structure in a specific embodiment provided by the present invention;

[0032] Figure 4 A schematic structural diagram of a suspension rod in a specific embodiment provided by the present invention;

[0033] Figure 5 This is a schematic diagram of the articulation of two longitudinal beams in a specific embodiment provided by the present invention.

[0034] In the figure: 1. building; 2. longitudinal beam; 3. suspension rod; 4. corridor; 5. transport vehicle; 6. cross beam; 7. steel springboard; 8. cross bar; 9. steel secondary beam; 10. pin; 31. upper section rod; 32. lower section rod; 33. cross brace; 34. baffle. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0036] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0038] The present invention provides a method for dismantling and reinforcing a suspended work platform after a super-high-rise fire. The structural form, bearing capacity and surrounding environment of the building 1 are fully investigated, and a high-altitude cantilever and a high-altitude suspended bottom dragging form are combined to fully utilize the bearing capacity of the existing structure itself, and the work platform is closely connected to the building 1, such as Figure 1-5 As shown, the erection method comprises the following steps: Step S1, preparing relevant materials for platform erection, such as welding machine, I-beam, square steel and other design materials.

[0039] The survey is carried out based on the plane control points and leveling points provided by the design combined with the completed structural engineering as the benchmark, and the measurement and layout are carried out according to the drawings of Building 1. The drawings of Building 1 include but are not limited to the design structure drawings, relevant technical approval orders and relevant information provided by the owner.

[0040] Step S2, multiple steel wire ropes are laid under the corridor 4. The steel wire ropes serve as safety ropes for workers during the construction process to ensure the safety of the construction. Both ends of the steel wire ropes are respectively fixedly connected to the twin towers of the building 1; the twin towers of the building 1 can be Tower A and Tower B. Both ends of the steel wire ropes are respectively reliably connected to the concrete main bodies of the two towers of the building 1. Chemical anchor bolts are used at the two fixing points to fix the embedded parts on the concrete structural members, and the safety ropes are tightened.

[0041] Step S3, the cantilever platform is constructed in multiple stages, and the first stage of the cantilever platform is constructed first. The first stage of the cantilever platform is constructed relying on the longitudinal beam 2 extending from the lower layer of the corridor 4 of the building 1.

[0042] A longitudinal beam 2 is arranged on the floor below the corridor 4. The longitudinal beam 2 passes through the cantilever beam opening from the inside and is cantilevered outward to serve as a cantilever beam. A hole is drilled on the floor slab, and one end of the longitudinal beam 2 located in the building 1 is fixed to the concrete floor slab using φ20 round steel and a back plate.

[0043] The longitudinal beam 2 is an I-beam, the spacing between two adjacent longitudinal beams 2 is 1.5 m, and the cantilever length extending outward from the building 1 is 3 m.

[0044] A hole for the hanger 3 is excavated in the area of ​​the bottom floor of the corridor 4 corresponding to the first section of the cantilever platform. The hole for the hanger 3 is used to lower and fix the hanger 3, thereby connecting the longitudinal beam 2 to form the main framework of the support system.

[0045] The hanger 3 is the main vertical load-bearing component of the construction platform. The material is a 100mm*100mm*4mm square steel pipe. It is fixed to the longitudinal beam 2 through the hanger 3. After fixation, a steel springboard 7 is laid on the longitudinal beam 2 and then the cross beam 6 is set.

[0046] The steel springboard 7 serves as the construction operation surface for the next process, which will be the most dangerous process in the entire process of the construction platform. Since the construction workers work completely in a suspended state, they will have great psychological pressure. Therefore, all high-altitude workers need to install three safety ropes. The first and second safety ropes are reliably connected to two steel wire ropes at different positions. After the third safety rope is tied to the construction worker's belt, the safety officer in the rear tower will adjust the length of the safety rope at any time according to the position of the construction worker to prevent the construction worker from tripping. All installed tools and materials are tied with anti-fall ropes to prevent accidental falls. All personnel in the lower area of ​​the corridor 4 are cleared, and 8# lead wire is tightened and welded between the steel springboards 7 and between the steel beams to ensure that the steel springboard 7 is reliably connected to the longitudinal beam 2.

[0047] After the construction of the longitudinal beam 2 is completed, the width is 6.2m. In order to meet the side operation requirements of the corridor 4, it is necessary to extend a certain distance on both sides of the corridor 4 as a construction platform. Therefore, a crossbeam 6 is set on the steel springboard 7. The crossbeam 6 is the same I-beam as the longitudinal beam 2. Both ends of the crossbeam 6 extend out of the corridor 4. The extension distance can be 2-2.5m. Taking the required construction space of 2m as an example, the extension distance is 2.35m, and a steel springboard 7 is laid on the part of the crossbeam 6 extending out of the corridor 4.

[0048] Step S4, after the construction of the first section of the construction platform is completed, the construction of other section construction platforms must be carried out as soon as possible. When constructing the next section of the cantilever platform, first construct the hanger 3 on the second section of the cantilever platform corresponding to the bottom floor of the corridor 4. The construction method of the hanger 3 is the same as that of the first section. After the construction is completed, the longitudinal beam 2 of the second section of the cantilever platform is connected to the longitudinal beam 2 of the first section of the cantilever platform accordingly. After fixing the corresponding longitudinal beam 2 of the second end cantilever platform to the hanger 3, lay the steel springboard 7, and lay the cross beam 6 and the corresponding part of the steel springboard 7.

[0049] Step S5, repeat step S4 until the cantilever platform construction is completed.

[0050] In this embodiment, the size of the opening of the hanger 3 is 300mm*300mm. Since there are combustible insulation materials in the curtain wall, all excavation processes adopt cold technology. An electric pick is used to remove the 130mm thick decorative layer within the opening range, and an electric pick is used to remove the 150mm thick concrete structure layer. The electric pick is used to flatten and remove the corrugated steel plate, and the aluminum curtain wall keel and thick aluminum plate under the corrugated steel plate are cut using an angle grinder + bracket.

[0051] In this embodiment, a total of 24 longitudinal beams 2 are cantilevered from the rooms below the corridor 4 corresponding to the two towers, and are gradually excavated from the inside to the outside. In order to prevent the residue from falling from the hole, a receiving hopper is required to be set outside the cantilever beam hole. The size of the cantilever beam hole is 300mm*400mm in width*height.

[0052] In an optional embodiment, the suspension rod 3 includes an upper rod 31 and a lower rod 32, and the construction method includes:

[0053] The lower section rod 32 is extended from the opening of the suspension rod 3 to the bottom of the corridor 4, and the upper section rod 31 is constructed after the elevation is adjusted and in place. The upper end of the lower section rod 32 is 500mm higher than the floor slab where the opening of the suspension rod 3 is set.

[0054] After the lower end of the upper section rod 31 is welded and fixedly connected to the top of the lower section rod 32, the upper section rod 31 is fixed to the top steel secondary beam 9 of the bottom layer, and during the construction process, it must be ensured to be vertical to the first section.

[0055] A cross bar 8 is provided in the middle of the hanger 3. The cross bar 8 has a certain length, is fixedly connected to the upper end of the upper section rod 31, and is supported on the upper edge of the hole of the hanger 3. The top elevation of the cross bar 8 can be the bottom elevation of the designed longitudinal beam 2, thereby supporting the hanger 3.

[0056] In an optional embodiment, the lower end of the hanger 3 is provided with an end corresponding to the longitudinal beam 2, and the end includes a cross brace 33 and a baffle 34. The cross brace 33 is fixedly connected to the lower end of the hanger 3 and extends horizontally along a square perpendicular to the longitudinal beam 2. The cross brace 33 is fixed to the hanger 3 by full welding to support the longitudinal beam 2. The baffle 34 is arranged at one end of the cross brace 33 away from the hanger 3 and extends upward to form a U-shaped placement station with the cross brace 33 and the hanger 3. After the longitudinal beam 2 is placed, the baffle 34 is used to limit the longitudinal beam 2. In addition, in order to increase stability, the longitudinal beam 2 is stably connected to the end by welding.

[0057] In an optional embodiment, the longitudinal beam 2 of the next cantilever platform is hinged to the longitudinal beam 2 of the previous cantilever platform through a pin 10, and the upper edges of the longitudinal beams 2 at both ends after being connected are hinged through the pin 10. The two are provided with corresponding hinged tubes or hinged ears at corresponding positions, so that the longitudinal beam 2 to be constructed can be overlapped and placed on top of the constructed longitudinal beam 2 first, and then the two longitudinal beams 2 are hinged through the pin 10 to drive the longitudinal beam 2 of the next cantilever platform to rotate and fall on the U-shaped placement station of the suspension rod 3. Specifically, after ensuring that the two sections of the longitudinal beam 2 are correctly connected, manual and small machines are used to assist the rotation, and the longitudinal beam 2 is rotated to the U-shaped placement station corresponding to the next cantilever platform, and the longitudinal beam 2 is welded and fixed to the suspension rod 3, and then the steel springboard 7 is laid.

[0058] The longitudinal beam 2 is transported on the constructed platform by a transport vehicle 5, and each longitudinal beam 2 is lengthened and fixed with a temporary pin 10, and is manually rotated with the assistance of a small machine to the corresponding U-shaped baffle 34 at the end of the suspended steel square tube for lengthening.

[0059] In this embodiment, during the rotation and lowering process of the longitudinal beam 2, a safety rope is required to control the lowering speed, and the connection position is fully welded to ensure that the weld meets the requirements, and then a springboard is laid to the hanger 3 to weld the continued steel beam to the connecting plate.

[0060] In an optional embodiment, in step S3, in order to ensure the bearing capacity of the cantilever platform, a steel tie rod is required to be set in the middle of the longitudinal beam 2 corresponding to the first section of the cantilever platform, and the upper end of the steel tie rod is fixed to the horizontal beam of the main truss of the floor below the corridor 4, and the lower end is fixed to the longitudinal beam 2.

[0061] The steel tie rod is made of square steel tube 100mm*100mm*4mm. The upper end is welded to the lower part of the lower flange of the main truss horizontal beam, and the lower end is welded to the upper flange of the I-beam of the longitudinal beam 2. The height of the fillet weld is 4mm.

[0062] In an optional embodiment, after the construction of each section of the steel gangway 7 is completed, the construction of the inter-column support and the horizontal support is carried out.

[0063] The construction platform is located at high altitude and is mainly affected by wind load. The maximum wind load in the horizontal direction is 3.81KN / ㎡, which is higher than the vertical load value. It is the control load of the construction platform. Inter-column support and horizontal support are set. The inter-column support is located between the hangers 3, and the horizontal support is located between the longitudinal beams 2. The inter-column support and horizontal support make the construction platform form a spatial structural system, so that the construction platform forms a whole, effectively bearing the effect of horizontal wind load, so the inter-column support and horizontal support should be carried out immediately after the construction of the steel springboard 7 is completed. The inter-column support and horizontal support are made of 60*60*3 square steel pipes cut and processed on the construction platform and welded on the horizontal and longitudinal beams 2, with a weld height of 3mm.

[0064] In an optional embodiment, outwardly cantilevered longitudinal beams 2 are provided at both ends of the corridor 4 corresponding to the twin towers of the building 1, a cantilevered platform is constructed from both ends of the corridor 4 to the middle, and the corridor 4 is closed in the middle.

[0065] In an optional embodiment, during the reinforcement and replacement of the steel structure of the corridor 4, a large amount of welding and cutting work will inevitably produce falling welding slag and residual materials, which are very likely to cause fire accidents. Therefore, isolation measures need to be set. In this application, after the construction of the steel springboard 7 of each cantilever platform is completed, a fireproof layer is laid, and the fireproof layer includes a steel wire mesh and a fireproof cloth. The steel wire mesh specification is 20mm*20mm*1.6mm and the fireproof cloth is 100g / ㎡ as a protective isolation measure, and the fine-mesh steel wire mesh fireproof cloth is very reliably connected to the steel springboard 7.

[0066] In an optional embodiment, a guardrail is set on the outermost side of the cantilever platform. The height of the guardrail is 2.2m. It is an independent railing that is not connected to the upper outer protection and is mainly a safety guardrail. The outer protection material is also made of fine-mesh wire mesh and fireproof cloth.

[0067] In an optional embodiment, a plurality of observation points are provided on both sides of the cantilever platform, and the observation points include horizontal observation points and vertical observation points; the horizontal observation points and the vertical observation points are observed respectively by a theodolite and a level.

[0068] The construction platform is divided into two independent north and south construction platforms, both of which need to be equipped with corresponding observation points. The observation points are divided into horizontal displacement observation points and vertical displacement observation points. Each platform is equipped with 8 horizontal displacement points and 8 vertical displacement points, which are respectively fixed on the platform longitudinal beam 2 and the hanger 3, and should have good visibility.

[0069] The horizontal displacement measurement will use a theodolite, which is set up at the A base point of the A building and looks back at the B base point of the B building. After locking the baseline, the horizontal displacement points on the platform longitudinal beam 2 are observed in turn.

[0070] The vertical displacement measurement uses a level instrument, which is set up on the 24th floor of Building A. The benchmark elevation control point is set up on the 24th floor of Building B. The level instrument is set up on the 24th floor of Building A. The tower scale of Building B is read from the rear view and then the data scale fixed on the platform boom 3 is observed in turn to obtain the observation data. The observation period and observation frequency are from the completion of the construction platform to the complete dismantling of the construction platform, which is the displacement observation period. It is initially determined to be six months from January to June. The observation frequency is twice a day, once in the morning and once in the afternoon. In case of strong winds, the measurement frequency will be increased according to the on-site conditions.

[0071] In an optional embodiment, a winch is installed on the second or third floor below the corridor 4. The winch is located at a position on the corridor 4 close to one of the buildings 1. A winch channel corresponding to the winch is chiseled on the corresponding corridor 4. The materials for constructing the platform are broken down into small pieces and hoisted using the winch. There is no need to set up large lifting equipment such as tower cranes and elevators. The bearing capacity of the existing structure is fully utilized to closely connect the working platform to the building 1. A combination of high-altitude cantilever and high-altitude suspended bottom dragging is adopted.

[0072] This method is suitable for the maintenance and renovation projects of existing buildings1 with large spans, high cantilevers, overall suspension, and difficult scaffolding erection.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A method for dismantling a super high-rise fire corridor and erecting a reinforced suspended work platform, characterized in that: The erection method comprises the following steps: Step S1, taking the plane control points and level points as the reference for surveying, and measuring and laying out according to the building drawings; Step S2, laying a plurality of steel wire ropes under the corridor, and the two ends of the steel wire ropes are respectively fixed to the twin towers of the building; Step S3, constructing the first cantilever platform; A longitudinal beam is set on the floor below the corridor, and the longitudinal beam passes through the cantilever beam opening from the inside to the outside and is cantilevered outside. The end of the longitudinal beam located inside the building is fixed on the concrete floor slab; Holes for the suspenders are drilled in the area of ​​the first cantilever platform corresponding to the floor slab of the corridor's ground floor for lowering and fixing the suspenders; It is fixed and installed through the suspender and the longitudinal beam. After laying the steel springboard on the longitudinal beam, the cross beam is set. Both ends of the cross beam extend out of the corridor, and the steel springboard is laid on the part of the cross beam extending out of the corridor. The steel springboard serves as the construction operation surface of the next process; Step S4, carrying out the construction of the next cantilever platform; The second section of the cantilever platform is constructed with a suspender on the bottom floor of the corridor. After the construction is completed, the longitudinal beam of the second section of the cantilever platform is connected to the longitudinal beam of the first section of the cantilever platform. After the longitudinal beam of the second end of the cantilever platform is fixed to the suspender, a steel springboard is laid, and the cross beam and the corresponding part of the steel springboard are laid; Step S5, repeating step S4 until the cantilever platform construction is completed; The boom includes an upper section and a lower section, and the construction method includes: Extend the lower section rod from the opening of the hanging rod to the bottom of the corridor, adjust the elevation and put it in place before constructing the upper section rod. After the lower end of the upper section rod is fixedly connected to the lower section rod, the upper section rod is fixed to the top steel secondary beam of the bottom layer. The lower end of the suspension rod is provided with an end corresponding to the longitudinal beam, and the end includes: A cross brace, which is fixedly connected to the lower end of the suspension rod and extends horizontally in a direction perpendicular to the longitudinal beam; A baffle, the baffle being arranged at one end of the cross brace away from the suspension rod and extending upward to form a U-shaped placement station with the cross brace and the suspension rod; The longitudinal beam of the next cantilever platform is hinged with the longitudinal beam of the previous cantilever platform through pins, driving the longitudinal beam of the next cantilever platform to rotate and fall on the U-shaped placement position of the suspension rod, and the longitudinal beam and the suspension rod are welded and fixed, and then the steel springboard is laid; The longitudinal beams are transported on the constructed platform by a transport vehicle, and the upper edges of the longitudinal beams at both ends are hinged by pins after being butted together. The two longitudinal beams are provided with corresponding hinge ears at corresponding positions, so that the longitudinal beams to be constructed can be overlapped and placed on top of the constructed longitudinal beams.

2. The method for dismantling and reinforcing a suspended work platform for a super-high-rise fire corridor according to claim 1 is characterized in that: In step S3, a steel tie rod is arranged in the middle of the longitudinal beam, the upper end of the steel tie rod is fixed to the horizontal beam of the main truss of the floor below the corridor, and the lower end is fixed to the longitudinal beam.

3. The method for dismantling and reinforcing the suspended work platform for super high-rise fire corridors according to claim 1 is characterized in that: After the construction of each section of steel springboard is completed, the inter-column support and horizontal support are constructed.

4. The method for dismantling and reinforcing a suspended work platform for a super-high-rise fire corridor according to claim 1 is characterized in that: The twin towers of the building are equipped with outward cantilevered longitudinal beams at both ends of the corridor corresponding to each other. Cantilevered platforms are constructed from both ends of the corridor to the middle, and the corridor is closed in the middle.

5. The method for dismantling and reinforcing the suspended work platform for super high-rise fire corridors according to claim 1 is characterized in that: After the construction of the steel gangway of each cantilever platform is completed, the fireproof layer is laid, which includes wire mesh and fireproof cloth.

6. The method for dismantling and reinforcing a suspended work platform for a super-high-rise fire corridor according to claim 1 is characterized in that: Multiple observation points are set on both sides of the cantilever platform, including horizontal observation points and vertical observation points; the horizontal observation points and vertical observation points are observed respectively by theodolite and level.

Images