Large cantilever concrete structure formwork layered anchor pulling construction method and intelligent monitoring system

Abstract

The invention discloses a large cantilever concrete structure formwork layered anchor pulling construction method and an intelligent monitoring system, and particularly relates to the field of building construction.The large cantilever concrete structure formwork layered anchor pulling construction method comprises the steps that a 16 # I-steel cantilever heavy frame is installed by pre-burying a high-strength bolt sleeve and conducting three-dimensional positioning; the first to sixth rows of frame bodies are erected layer by layer, a secondary top layer is poured, and the first to fourth phi-20 flower basket pull rods are sequentially installed after top layer concrete is poured; then main and secondary keels and an adjustable jacking are installed, a formwork is laid, and the elevation is corrected to be + / -3 mm; steel bar numerical control machining straight thread connection and water and electricity pre-burying are synchronously completed; arranging a vibrating wire strain gauge, a spoke pressure gauge and a tilt angle sensor, uploading data to the BIM in real time, and establishing load-deformation dual-threshold early warning; after the formwork is removed, a scaffold and a main body structure are tied and reinforced in time at the upturning ridge of the eave gutter on the top layer of the concrete structure according to a wall connecting piece method through steel pipe fasteners; the formwork and the outer protection frame are integrated, concrete is poured twice, early warning and alarm linkage are achieved, and safety and high efficiency are achieved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and more specifically, to a method for layered anchoring construction of large cantilever concrete structures and an intelligent monitoring system. Background Technology

[0002] With the development of the construction industry, buildings with complex shapes are becoming increasingly common, among which large cantilevered concrete structures are widely used in public buildings, high-rise buildings, and other fields. The cantilever size of conventional high-rise eaves is generally less than or equal to 3 meters, but for high-rise eaves structures with cantilever sizes exceeding 3 meters, traditional cantilever formwork construction methods have many problems. Traditional methods often employ single-layer tie-rod cantilever support systems, which cannot effectively disperse the bending moment generated by ultra-long cantilever structures, leading to load concentration and increasing structural safety risks. At the same time, the formwork and external protective frame are usually erected separately, which not only increases the input of materials and labor, but also increases the load due to the repeated erection of the frame, further increasing safety hazards. In addition, monitoring during construction relies heavily on manual inspection, which is lagging and makes it difficult to grasp the stress and deformation of the frame in real time, making it impossible to detect and deal with safety risks in a timely manner. Summary of the Invention

[0003] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a layered anchoring construction method and intelligent monitoring system for large cantilever concrete structures to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: S1: Pre-embed high-strength bolt sleeves, measure and set out lines, install cantilevered support frame and fix it with high-strength bolts, connecting plates and pads, and proceed to subsequent construction after acceptance; S2: Erect the first and second rows of scaffolding for the secondary top layer and install zigzag bracing. After acceptance, pour the concrete for the secondary top layer and install the first and second steel tie rods. Erect the third and fourth rows of scaffolding for the top layer and install zigzag bracing. After acceptance, pour the concrete for the top layer and install the third and fourth steel tie rods. Erect the fifth and sixth rows of scaffolding, and simultaneously install zigzag bracing, vertical scissor bracing, horizontal scissor bracing, and external steel mesh. S3: Install the main keel, secondary keel, and adjustable top support of the formwork; lay the bottom formwork and side formwork of the beam; reinforce the bottom frame and correct the elevation; and conduct a pre-inspection. S4: Reinforcement and Plumbing Construction: Reinforcement binding and plumbing installation are carried out. After inspection and acceptance, concrete pouring is prepared. S5: Intelligent monitoring and concrete pouring: Install an intelligent monitoring system before pouring, and monitor according to the "load-deformation" dual threshold early warning mechanism during and after pouring; construct the non-eave parts first, then construct the eaves flat panel components, and construct the upturned eaves shape after it has set. S6: Formwork Removal and Scaffolding Reinforcement: After the eaves concrete pouring is completed and the side formwork of the upturned sill is removed, steel pipe couplers should be used in a timely manner at the upturned sill of the top eaves gutter of the concrete structure to tie and reinforce the scaffolding to the main structure.

[0005] Preferably, in step S1, before the construction of the cantilever structure, high-strength bolt sleeves are precisely pre-embedded according to the detailed design drawings. A total station is used for three-dimensional coordinate positioning to ensure that the deviation of the sleeve center position is controlled within ±2mm. After the pre-embedding is completed, the surveying team uses an electronic theodolite and a laser level to measure and lay out the lines, clearly marking the installation positioning lines and elevation control points of the cantilever support frame on the concrete structure surface. During the installation process, the levelness of the support frame is monitored in real time using an electronic level. After all installations are completed, the supervision unit organizes a special acceptance inspection.

[0006] Preferably, in S2, the zigzag bracing extends to be installed before the formwork is accepted; before the top layer of concrete is poured, the frame functions as an external protective frame, and after the top layer of concrete is poured, the frame is seamlessly converted into a formwork protective frame.

[0007] Preferably, in step S3, after the support frame has passed inspection, the installation of the formwork support system begins. First, the main formwork keel is installed, using double-splitting 14# channel steel, precisely positioned according to the layout line, and fixed to the support on the support frame using a pin-type connection. Next, the secondary keel is installed, using 50mm×100mm×2.5mm square steel pipes, with the spacing determined by calculation and controlled between 200mm and 250mm, and reliably connected to the main keel using U-shaped clips.

[0008] Preferably, in step S4, after pre-inspection, the reinforcement engineering work begins; firstly, reinforcement is laid out according to the construction drawings, and CNC reinforcement processing equipment is used to accurately cut and shape the main reinforcement with a diameter of Φ25 or more, and to process the threads at the ends of the reinforcement that need to be connected; then the beam reinforcement is tied, mainly using the straight thread sleeve connection process, strictly ensuring the quality of the reinforcement connection, and the joint misalignment rate is not less than 50%; during the tying process, the prestressed tendon corrugated pipe positioning bracket is installed simultaneously to ensure the accurate position of the duct.

[0009] Preferably, the "load-deformation" threshold early warning mechanism in S5 is as follows: the early warning value is set as the axial force of the tie rod / upright pole ≥ 80% of the design value or the settlement ≥ 8mm. When the early warning value is reached, construction is suspended and an investigation is conducted. The alarm value is set as the axial force ≥ 100% or the settlement ≥ 12mm. When the alarm value is reached, personnel are immediately evacuated and the emergency plan is activated.

[0010] The technical effects and advantages of this invention are as follows: (1) Integrated design of formwork structure and external protective frame: The lower part of the concrete eaves structure projection is the horizontal support layer of the formwork. The external plane of the concrete eaves structure is designed with a vertical protective layer of the external frame. The horizontal support layer of the formwork and the vertical protective layer of the external frame are integrated to avoid the repeated erection of the frame, which would increase the safety risk due to the increased load, and reduce the efficiency and increase the cost due to the increase of materials and labor.

[0011] (2) Construction sequence optimization and frame function conversion: the zigzag bracing is extended to be installed before the formwork acceptance to avoid obstruction of passage during the external protective frame stage. Before the top concrete is poured, the frame function is the external protective frame. After the top concrete is poured, it is seamlessly converted to the large cantilever concrete structure formwork + construction protective frame. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the method flow of the present invention.

[0013] Figure 2 This is a schematic diagram of the reinforcement of the external support pole and the eaves gutter wall connection component of the present invention.

[0014] Figure 3 This is a schematic diagram of the integrated construction cross-sectional structure of the anchored steel cantilever formwork and external protective frame of the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figure 1 As shown, the present invention provides a layered anchoring construction method for formwork of large cantilever concrete structures, including the following steps: S1: Pre-embed high-strength bolt sleeves, measure and set out lines, install cantilevered support frame and fix it with high-strength bolts, connecting plates and pads, and proceed to subsequent construction after acceptance; In S1, before the construction of the cantilever structure, high-strength bolt sleeves are precisely pre-embedded according to the detailed design drawings. A total station is used for three-dimensional coordinate positioning to ensure that the deviation of the sleeve center position is controlled within ±2mm. After the pre-embedding is completed, the surveying team uses an electronic theodolite and a laser level to measure and lay out the lines, clearly marking the installation positioning lines and elevation control points of the cantilever support frame on the concrete structure surface. During the installation process, the electronic level is used to monitor the levelness of the support frame in real time. After all installations are completed, the supervision unit organizes a special acceptance inspection to check key indicators such as bolt tightening torque, connection plate tightness, and overall verticality of the support frame. Only after the acceptance is qualified and a written record is made can the next layer of formwork erection process begin.

[0017] S2: Erect the first and second rows of scaffolding for the secondary top layer and install zigzag bracing. After acceptance, pour the concrete for the secondary top layer and install the first and second steel tie rods. Erect the third and fourth rows of scaffolding for the top layer and install zigzag bracing. After acceptance, pour the concrete for the top layer and install the third and fourth steel tie rods. Erect the fifth and sixth rows of scaffolding, and simultaneously install zigzag bracing, vertical scissor bracing, horizontal scissor bracing, and external steel mesh. In S2, the zigzag bracing extends to the installation before the formwork is accepted; before the top layer of concrete is poured, the frame functions as an external protective frame, and after the top layer of concrete is poured, the frame is seamlessly converted into a formwork protective frame. S3: Install the main keel, secondary keel, and adjustable top support of the formwork; lay the bottom formwork and side formwork of the beam; reinforce the bottom frame and correct the elevation; and conduct a pre-inspection. In step S3, after the support frame passes inspection, the installation of the formwork support system begins. First, the main formwork keel is installed, using double-splitting 14# channel steel, precisely positioned according to the layout line, and fixed to the supports on the support frame using pin-type connections. Next, the secondary keel is installed, using 50mm×100mm×2.5mm square steel pipes, with the spacing determined by calculation and controlled between 200mm and 250mm, and reliably connected to the main keel using U-shaped clips. Next, the adjustable top support is installed, inserted into the top of the upright, and the adjusting nut is rotated to initially adjust it to near the design elevation; then the bottom formwork of the beam is laid, using 15mm thick film-coated plywood, and the board joints are sealed with double-sided tape to prevent grout leakage; after the bottom formwork of the beam is laid, the side formwork of the beam is installed. The side formwork adopts a combination of steel formwork and wooden formwork, and special corner formwork is added at the inside corners to ensure straight corners; After the initial installation of the formwork is completed, the bottom of the frame is reinforced by adding longitudinal and transverse ground bracing and diagonal scissor bracing to enhance the overall rigidity and stability of the frame. Finally, a precision level is used to fully verify and finely correct the elevation, strictly controlling the elevation error within ±3mm. After all procedures are completed, the construction unit's quality inspector and the work team leader conduct a pre-inspection, checking the joist spacing, formwork flatness, joint tightness, and reliability of the reinforcement system. The pre-inspection report is filled out and submitted to the supervising engineer for review. Only after confirmation that everything is correct can the next rebar tying procedure be carried out.

[0018] S4: Carry out steel bar binding and water and electricity installation. After inspection and acceptance, prepare for concrete pouring. In step S4, after pre-inspection, the steel reinforcement work begins. First, steel reinforcement is laid out according to the construction drawings. CNC steel reinforcement processing equipment is used to accurately cut and shape the main reinforcement bars with a diameter of Φ25 or more. Threaded threads are processed on the ends of the steel bars that need to be connected. Then, the beam reinforcement is tied, mainly using the straight thread sleeve connection process to strictly ensure the quality of the steel reinforcement connection, with a joint misalignment rate of not less than 50%. During the tying process, the prestressed tendon corrugated pipe positioning bracket is installed simultaneously to ensure the accurate position of the duct. While the steel reinforcement binding was being carried out, the water and electricity installation team worked together according to the integrated layout plan of the pre-embedded pipelines to accurately pre-embed the electromechanical conduits, sleeves and grounding devices; all pipelines were fixed to the steel reinforcement frame with special clamps to prevent displacement during concrete pouring; and key components such as prestressed anchor plates and grouting holes were precisely installed and sealed for protection. After the installation of reinforcing bars and pipelines is completed, a special inspection of concealed works is organized. Quality inspectors use a reinforcing bar scanner to check the thickness of the protective layer, ensuring that the deviation is within the range of +5mm to -3mm. A torque wrench is used to check the tightening torque of the straight thread joints to ensure that the design requirement of 320N·m is met. At the same time, the coordinates and elevations of the pipelines are checked to ensure that they meet the design requirements. After the inspection is passed, the concealed works inspection record is immediately processed and relevant documents are signed. Then, debris inside the formwork is cleaned, and the formwork is rinsed and moistened with a high-pressure water gun. All preparations before concrete pouring are completed, and the conditions for concrete pouring are met.

[0019] S5: Install an intelligent monitoring system before pouring, and monitor the process and after pouring according to the "load-deformation" dual threshold early warning mechanism; when pouring, construct the non-eave parts first, then construct the eaves flat panel components, and construct the upturned eaves shape after it has set. The "load-deformation" threshold early warning mechanism in S5 is as follows: the early warning value is set when the axial force of the tie rod / upright pole is ≥80% of the design value or the settlement is ≥8mm. When the early warning value is reached, construction is suspended and an investigation is carried out. The alarm value is set when the axial force is ≥100% or the settlement is ≥12mm. When the alarm value is reached, personnel are immediately evacuated and the emergency plan is activated. Before concrete pouring, check the tightness of the turnbuckles and the height of the cantilever beams one by one to ensure that the outer end of the cantilever steel beam is slightly higher than the anchoring end by 5-8mm. Concrete pouring is carried out during the day and is monitored in three time periods: before pouring, during pouring, and after final setting.

[0020] S6: Formwork Removal and Scaffolding Reinforcement: After the eaves concrete pouring is completed and the side formwork of the upturned sill is removed, steel pipe couplers are used in a timely manner at the upturned sill of the top eaves gutter of the concrete structure to tie and reinforce the scaffolding to the main structure in the same way as wall ties. In step S6, 48 hours after the completion of the eaves structure concrete pouring, when the concrete strength reaches 15MPa or higher, the removal of the side formwork of the upturned sill begins. The removal operation uses specialized pry bars and small pneumatic tools, strictly following the order of first supporting and then removing, and last supporting and then removing. Rough handling that could damage the concrete edges is strictly prohibited. Immediately after the side formwork is removed, the appearance quality of the concrete is inspected, and defects such as surface bubbles and honeycomb are recorded and marked. After the side formwork was removed, the top layer of the cantilever scaffold was immediately reinforced to the main structure. The steel pipe and fastener wall connection method was adopted. At the top step of the scaffold, double fasteners were used to connect and reinforce the cantilever sill on each span. The outer end of the steel pipe horizontal bar was locked and fixed to the external upright of the scaffold with fasteners. The inner end of the steel pipe horizontal bar extended to the concrete cantilever sill. The two vertical steel pipes clamping the upper sill were locked to the steel pipe horizontal bar with double fasteners, thus completing the reinforcement of the scaffold to the main structure.

[0021] This invention also includes an intelligent monitoring system for layered anchoring construction of large cantilever concrete structure formwork, comprising: The layered anchored formwork structure includes a cantilevered support frame, a four-bar assembly, a horizontal support layer for the formwork, and a vertical protective layer for the outer frame. The cantilevered support frame is anchored to the bottom of the second-to-last layer, serving as the foundation of the formwork. The four-bar assembly includes a first-to-second tie rod and a third-to-fourth tie rod. The first-to-second tie rod is anchored to the top plate of the second-to-last layer, with a height difference of 3600mm from the cantilevered support frame. The third-to-fourth tie rod is anchored to the top plate of the first layer, with a height difference of 7200mm from the cantilevered support frame. The horizontal support layer of the formwork is located below the projection of the concrete eaves structure, and the vertical protective layer of the outer frame is located outside the plane of the concrete eaves structure; the two are designed as an integrated unit. The intelligent monitoring system includes a vibrating wire strain monitoring steel tie rod, a spoke-type pressure sensor, an inclination sensor, and a BIM data platform. The vibrating wire strain monitoring steel tie rod is installed on the steel tie rod to monitor axial force. The spoke-type pressure sensor is installed at the bottom of the formwork upright to monitor the axial force of the upright. The inclination sensor is installed at the end of the cantilever beam and the top of the outermost upright of the formwork to monitor settlement and tilting. The monitoring data is transmitted to the BIM data platform in real time.

[0022] The cantilevered support frame uses 16# I-beams, anchored at the bottom of the second-to-last floor as the formwork foundation, bearing the initial construction load. The I-beams are anchored to the exterior wall side via two 8.8 grade M22 high-strength bolts, with a length equal to the cantilever length of the roof eaves plus 0.35m and a spacing of ≤1m. Hanging lugs are installed at the ends of the I-beams according to their length; four hanging lugs are installed when the length is >4000mm.

[0023] The four-link assembly includes link 1-2 and link 3-4. Link 1-2 is anchored to the top slab of the second-to-last floor, with a height difference of 3600mm from the cantilevered support frame, and bears the mid-construction load; link 3-4 is anchored to the top slab, with a height difference of 7200mm, and together bears the peak load during the concrete pouring period. The links are φ20 plain round steel reinforcement turnbuckles, and the top end is anchored to the concrete structure and the lower section is connected to the lifting lug plate using 8.8 grade M22 high-strength bolts, with an angle of not less than 45° with the cantilevered steel beam.

[0024] The horizontal support layer of the formwork and the vertical protective layer of the outer scaffold are designed as an integrated unit. The lower part of the concrete eaves structure projection is the horizontal support layer of the formwork, and the outer surface is the vertical protective layer of the outer scaffold. The longitudinal and span distances of the uprights in the horizontal support layer of the formwork are ≤1m, the step distance is ≤1.2m, and the distance between the uprights and the wall is 0.4m. Vertical scissor bracing is installed at the ends of the scaffold and in the interior longitudinal and transverse directions for ≤6m. The outer facade is fully braced with scissor bracing. Horizontal scissor bracing or zigzag bracing is installed on the upper part of the ground-level bracing and the top of the scaffold. The wall ties are arranged in a two-step, two-span configuration with double fasteners.

[0025] The structure's function is transformed: before the top layer of concrete is poured, the structure functions as an external protective frame; after pouring, it is seamlessly converted into a large cantilever concrete structure formwork + construction protective frame. The zigzag bracing is installed before acceptance to avoid obstructing passage during the external protective frame stage.

[0026] In the intelligent monitoring system, the sensor layout is selected from a representative load-bearing frame section. Vibrating wire strain sensors are installed on the steel tie rods to monitor the axial force. Wheel spoke pressure sensors are installed at the bottom of the formwork uprights to monitor the axial force of the uprights. Inclination sensors are installed at the cantilever beam ends and the top of the outermost uprights of the formwork to monitor settlement and outward tilt. In data transmission and early warning, monitoring data is transmitted to the BIM platform in real time, dynamically displaying the load distribution. A dual-threshold early warning mechanism of "load-deformation" is established: the early warning value is when the axial force of the tie rod / upright pole is ≥80% of the design value or the settlement is ≥8mm, and construction is suspended for investigation when the early warning value is reached; the alarm value is when the axial force is ≥100% or the settlement is ≥12mm, and personnel are evacuated immediately and the emergency plan is activated when the alarm value is reached.

[0027] In conclusion, 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 should be included within the protection scope of the present invention.

Claims

1. A method for layered anchoring construction of formwork for large cantilever concrete structures, characterized in that: include: S1: Pre-embed high-strength bolt sleeves, measure and set out lines, install cantilevered support frame and fix it with high-strength bolts, connecting plates and pads, and proceed to subsequent construction after acceptance; S2: Erect the first and second rows of scaffolding for the secondary top layer and install zigzag bracing. After acceptance, pour the concrete for the secondary top layer and install the first and second steel tie rods. Erect the third and fourth rows of scaffolding for the top layer and install zigzag bracing. After acceptance, pour the concrete for the top layer and install the third and fourth steel tie rods. Erect the fifth and sixth rows of scaffolding, and simultaneously install zigzag bracing, vertical scissor bracing, horizontal scissor bracing, and external steel mesh. S3: Install the main keel, secondary keel, and adjustable top support of the formwork; lay the bottom formwork and side formwork of the beam; reinforce the bottom frame and correct the elevation; and conduct a pre-inspection. S4: Reinforcement and Plumbing Construction: Reinforcement binding and plumbing installation are carried out. After inspection and acceptance, concrete pouring is prepared. S5: Intelligent monitoring and concrete pouring: Install an intelligent monitoring system before pouring, and monitor according to the "load-deformation" dual threshold early warning mechanism during and after pouring; construct the non-eave parts first, then construct the eaves flat panel components, and construct the upturned eaves shape after it has set. S6: Formwork Removal and Scaffolding Reinforcement: After the eaves concrete pouring is completed and the side formwork of the upturned sill is removed, steel pipe couplers should be used in a timely manner at the upturned sill of the top eaves gutter of the concrete structure to tie and reinforce the scaffolding to the main structure.

2. The method for layered anchoring construction of formwork for large cantilever concrete structures according to claim 1, characterized in that: In S1, before the construction of the cantilever structure, high-strength bolt sleeves are precisely pre-embedded according to the detailed design drawings. A total station is used for three-dimensional coordinate positioning to ensure that the deviation of the sleeve center position is controlled within ±2mm. After the pre-embedding is completed, the surveying team uses an electronic theodolite and a laser level to measure and lay out the lines, clearly marking the installation positioning lines and elevation control points of the cantilever support frame on the concrete structure surface. During the installation process, the levelness of the support frame is monitored in real time using an electronic level. After all installations are completed, the supervision unit organizes a special acceptance inspection.

3. The method for layered anchoring construction of formwork for large cantilever concrete structures according to claim 1, characterized in that: In S2, the zigzag bracing extends to the installation before the formwork is accepted; before the top layer of concrete is poured, the frame functions as an external protective frame, and after the top layer of concrete is poured, the frame is seamlessly converted into a formwork protective frame.

4. The method for layered anchoring construction of formwork for large cantilever concrete structures according to claim 1, characterized in that: The "load-deformation" threshold early warning mechanism in S5 is as follows: the early warning value is set when the axial force of the tie rod / upright pole is ≥80% of the design value or the settlement is ≥8mm. When the early warning value is reached, construction is suspended and an investigation is carried out. The alarm value is set when the axial force is ≥100% or the settlement is ≥12mm. When the alarm value is reached, personnel are immediately evacuated and the emergency plan is activated. Before concrete pouring, check the tightness of the turnbuckles and the height of the cantilever beams one by one to ensure that the outer end of the cantilever steel beam is slightly higher than the anchoring end by 5-8mm. Concrete pouring is carried out during the day and is monitored in three time periods: before pouring, during pouring, and after final setting.

5. An intelligent monitoring system for layered anchoring construction of large cantilever concrete structure formwork, using any one of the layered anchoring construction methods for large cantilever concrete structure formwork as described in claims 1-4, characterized in that: The system includes a layered anchored formwork structure and an intelligent monitoring system. The layered anchored formwork structure comprises a cantilevered support frame, a four-bar assembly, a horizontal support layer, and a vertical protective layer for the outer frame. The cantilevered support frame is anchored to the bottom of the second-to-top layer, serving as the formwork foundation. The four-bar assembly includes a first-to-second tie rod and a third-to-fourth tie rod. The first-to-second tie rod is anchored to the top plate of the second-to-top layer, with a height difference of 3600mm from the cantilevered support frame. The third-to-fourth tie rod is anchored to the top plate of the top layer, with a height difference of 7200mm from the cantilevered support frame. The horizontal support layer is located within the concrete... The lower part of the earthen eaves structure projection, the vertical protective layer of the outer frame is located outside the plane of the concrete eaves structure, and the two are designed as an integrated unit; the intelligent monitoring system includes a vibrating wire strain monitoring steel tie rod, a spoke pressure sensor, an inclination sensor and a BIM data platform. The vibrating wire strain monitoring steel tie rod is installed on the steel tie rod to monitor the axial force, the spoke pressure sensor is installed at the bottom of the formwork upright to monitor the axial force of the upright, and the inclination sensor is installed at the end of the cantilever beam and the top of the outermost upright of the formwork to monitor settlement and outward tilt. The monitoring data is transmitted to the BIM data platform in real time.

6. The intelligent monitoring system for layered anchoring construction of large cantilever concrete structure formwork as described in claim 5, characterized in that: The cantilevered support frame uses 16# I-beams and is anchored to the exterior wall side by two 8.8 grade M22 high-strength bolts. The length of the cantilevered support frame is the cantilever length of the roof eaves + 0.35m, and the spacing between the I-beams is ≤1m. The top of the basket tie rod of the four-link assembly is anchored to the concrete structure with 8.8 grade M22 high-strength bolts, and the lower end plate of the basket tie rod is connected to the end lug plate of the I-beam with 8.8 grade M22 high-strength bolts. The angle between the steel reinforcement tie rod and the cantilevered steel beam is not less than 45°.

7. The intelligent monitoring system for layered anchoring construction of large cantilever concrete structure formwork as described in claim 5, characterized in that: The longitudinal and span distances of the uprights in the horizontal support layer of the formwork are all ≤1m, the step distance is ≤1.2m, and the distance between the uprights and the wall is 0.4m. Vertical scissor bracing is installed at the ends of the frame and in the interior longitudinal and transverse directions for ≤6m. The exterior facade is fully braced with scissor bracing. Horizontal scissor bracing or zigzag bracing is installed on the upper part of the sweeping rod and the top of the frame. The wall ties are arranged in a two-step, two-span configuration with double fasteners. Tool-type wall ties are used to tie through the wall at solid wall locations. The wall ties at wall opening locations are tied to the solid formwork that has been poured indoors and has not been removed for ≤2 spans.

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